fs/ext4/super.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/fs/ext4/super.c
   4  *
   5  * Copyright (C) 1992, 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/fs/minix/inode.c
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  *
  16  *  Big-endian to little-endian byte-swapping/bitmaps by
  17  *        David S. Miller (davem@caip.rutgers.edu), 1995
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/string.h>
  22 #include <linux/fs.h>
  23 #include <linux/time.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/slab.h>
  26 #include <linux/init.h>
  27 #include <linux/blkdev.h>
  28 #include <linux/backing-dev.h>
  29 #include <linux/parser.h>
  30 #include <linux/buffer_head.h>
  31 #include <linux/exportfs.h>
  32 #include <linux/vfs.h>
  33 #include <linux/random.h>
  34 #include <linux/mount.h>
  35 #include <linux/namei.h>
  36 #include <linux/quotaops.h>
  37 #include <linux/seq_file.h>
  38 #include <linux/ctype.h>
  39 #include <linux/log2.h>
  40 #include <linux/crc16.h>
  41 #include <linux/dax.h>
  42 #include <linux/cleancache.h>
  43 #include <linux/uaccess.h>
  44 #include <linux/iversion.h>
  45 #include <linux/unicode.h>
  46 #include <linux/part_stat.h>
  47 #include <linux/kthread.h>
  48 #include <linux/freezer.h>
  49 #include <linux/fsnotify.h>
  50 #include <linux/fs_context.h>
  51 #include <linux/fs_parser.h>
  52
  53 #include "ext4.h"
  54 #include "ext4_extents.h"       /* Needed for trace points definition */
  55 #include "ext4_jbd2.h"
  56 #include "xattr.h"
  57 #include "acl.h"
  58 #include "mballoc.h"
  59 #include "fsmap.h"
  60
  61 #define CREATE_TRACE_POINTS
  62 #include <trace/events/ext4.h>
  63
  64 static struct ext4_lazy_init *ext4_li_info;
  65 static DEFINE_MUTEX(ext4_li_mtx);
  66 static struct ratelimit_state ext4_mount_msg_ratelimit;
  67
  68 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
  69                              unsigned long journal_devnum);
  70 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
  71 static void ext4_update_super(struct super_block *sb);
  72 static int ext4_commit_super(struct super_block *sb);
  73 static int ext4_mark_recovery_complete(struct super_block *sb,
  74                                         struct ext4_super_block *es);
  75 static int ext4_clear_journal_err(struct super_block *sb,
  76                                   struct ext4_super_block *es);
  77 static int ext4_sync_fs(struct super_block *sb, int wait);
  78 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
  79 static int ext4_unfreeze(struct super_block *sb);
  80 static int ext4_freeze(struct super_block *sb);
  81 static inline int ext2_feature_set_ok(struct super_block *sb);
  82 static inline int ext3_feature_set_ok(struct super_block *sb);
  83 static void ext4_destroy_lazyinit_thread(void);
  84 static void ext4_unregister_li_request(struct super_block *sb);
  85 static void ext4_clear_request_list(void);
  86 static struct inode *ext4_get_journal_inode(struct super_block *sb,
  87                                             unsigned int journal_inum);
  88 static int ext4_validate_options(struct fs_context *fc);
  89 static int ext4_check_opt_consistency(struct fs_context *fc,
  90                                       struct super_block *sb);
  91 static int ext4_apply_options(struct fs_context *fc, struct super_block *sb);
  92 static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param);
  93 static int ext4_get_tree(struct fs_context *fc);
  94 static int ext4_reconfigure(struct fs_context *fc);
  95 static void ext4_fc_free(struct fs_context *fc);
  96 static int ext4_init_fs_context(struct fs_context *fc);
  97 static const struct fs_parameter_spec ext4_param_specs[];
  98
  99 /*
 100  * Lock ordering
 101  *
 102  * page fault path:
 103  * mmap_lock -> sb_start_pagefault -> invalidate_lock (r) -> transaction start
 104  *   -> page lock -> i_data_sem (rw)
 105  *
 106  * buffered write path:
 107  * sb_start_write -> i_mutex -> mmap_lock
 108  * sb_start_write -> i_mutex -> transaction start -> page lock ->
 109  *   i_data_sem (rw)
 110  *
 111  * truncate:
 112  * sb_start_write -> i_mutex -> invalidate_lock (w) -> i_mmap_rwsem (w) ->
 113  *   page lock
 114  * sb_start_write -> i_mutex -> invalidate_lock (w) -> transaction start ->
 115  *   i_data_sem (rw)
 116  *
 117  * direct IO:
 118  * sb_start_write -> i_mutex -> mmap_lock
 119  * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
 120  *
 121  * writepages:
 122  * transaction start -> page lock(s) -> i_data_sem (rw)
 123  */
 124
 125 static const struct fs_context_operations ext4_context_ops = {
 126         .parse_param    = ext4_parse_param,
 127         .get_tree       = ext4_get_tree,
 128         .reconfigure    = ext4_reconfigure,
 129         .free           = ext4_fc_free,
 130 };
 131
 132
 133 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
 134 static struct file_system_type ext2_fs_type = {
 135         .owner                  = THIS_MODULE,
 136         .name                   = "ext2",
 137         .init_fs_context        = ext4_init_fs_context,
 138         .parameters             = ext4_param_specs,
 139         .kill_sb                = kill_block_super,
 140         .fs_flags               = FS_REQUIRES_DEV,
 141 };
 142 MODULE_ALIAS_FS("ext2");
 143 MODULE_ALIAS("ext2");
 144 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
 145 #else
 146 #define IS_EXT2_SB(sb) (0)
 147 #endif
 148
 149
 150 static struct file_system_type ext3_fs_type = {
 151         .owner                  = THIS_MODULE,
 152         .name                   = "ext3",
 153         .init_fs_context        = ext4_init_fs_context,
 154         .parameters             = ext4_param_specs,
 155         .kill_sb                = kill_block_super,
 156         .fs_flags               = FS_REQUIRES_DEV,
 157 };
 158 MODULE_ALIAS_FS("ext3");
 159 MODULE_ALIAS("ext3");
 160 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
 161
 162
 163 static inline void __ext4_read_bh(struct buffer_head *bh, int op_flags,
 164                                   bh_end_io_t *end_io)
 165 {
 166         /*
 167          * buffer's verified bit is no longer valid after reading from
 168          * disk again due to write out error, clear it to make sure we
 169          * recheck the buffer contents.
 170          */
 171         clear_buffer_verified(bh);
 172
 173         bh->b_end_io = end_io ? end_io : end_buffer_read_sync;
 174         get_bh(bh);
 175         submit_bh(REQ_OP_READ, op_flags, bh);
 176 }
 177
 178 void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
 179                          bh_end_io_t *end_io)
 180 {
 181         BUG_ON(!buffer_locked(bh));
 182
 183         if (ext4_buffer_uptodate(bh)) {
 184                 unlock_buffer(bh);
 185                 return;
 186         }
 187         __ext4_read_bh(bh, op_flags, end_io);
 188 }
 189
 190 int ext4_read_bh(struct buffer_head *bh, int op_flags, bh_end_io_t *end_io)
 191 {
 192         BUG_ON(!buffer_locked(bh));
 193
 194         if (ext4_buffer_uptodate(bh)) {
 195                 unlock_buffer(bh);
 196                 return 0;
 197         }
 198
 199         __ext4_read_bh(bh, op_flags, end_io);
 200
 201         wait_on_buffer(bh);
 202         if (buffer_uptodate(bh))
 203                 return 0;
 204         return -EIO;
 205 }
 206
 207 int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait)
 208 {
 209         if (trylock_buffer(bh)) {
 210                 if (wait)
 211                         return ext4_read_bh(bh, op_flags, NULL);
 212                 ext4_read_bh_nowait(bh, op_flags, NULL);
 213                 return 0;
 214         }
 215         if (wait) {
 216                 wait_on_buffer(bh);
 217                 if (buffer_uptodate(bh))
 218                         return 0;
 219                 return -EIO;
 220         }
 221         return 0;
 222 }
 223
 224 /*
 225  * This works like __bread_gfp() except it uses ERR_PTR for error
 226  * returns.  Currently with sb_bread it's impossible to distinguish
 227  * between ENOMEM and EIO situations (since both result in a NULL
 228  * return.
 229  */
 230 static struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb,
 231                                                sector_t block, int op_flags,
 232                                                gfp_t gfp)
 233 {
 234         struct buffer_head *bh;
 235         int ret;
 236
 237         bh = sb_getblk_gfp(sb, block, gfp);
 238         if (bh == NULL)
 239                 return ERR_PTR(-ENOMEM);
 240         if (ext4_buffer_uptodate(bh))
 241                 return bh;
 242
 243         ret = ext4_read_bh_lock(bh, REQ_META | op_flags, true);
 244         if (ret) {
 245                 put_bh(bh);
 246                 return ERR_PTR(ret);
 247         }
 248         return bh;
 249 }
 250
 251 struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block,
 252                                    int op_flags)
 253 {
 254         return __ext4_sb_bread_gfp(sb, block, op_flags, __GFP_MOVABLE);
 255 }
 256
 257 struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
 258                                             sector_t block)
 259 {
 260         return __ext4_sb_bread_gfp(sb, block, 0, 0);
 261 }
 262
 263 void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block)
 264 {
 265         struct buffer_head *bh = sb_getblk_gfp(sb, block, 0);
 266
 267         if (likely(bh)) {
 268                 ext4_read_bh_lock(bh, REQ_RAHEAD, false);
 269                 brelse(bh);
 270         }
 271 }
 272
 273 static int ext4_verify_csum_type(struct super_block *sb,
 274                                  struct ext4_super_block *es)
 275 {
 276         if (!ext4_has_feature_metadata_csum(sb))
 277                 return 1;
 278
 279         return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
 280 }
 281
 282 static __le32 ext4_superblock_csum(struct super_block *sb,
 283                                    struct ext4_super_block *es)
 284 {
 285         struct ext4_sb_info *sbi = EXT4_SB(sb);
 286         int offset = offsetof(struct ext4_super_block, s_checksum);
 287         __u32 csum;
 288
 289         csum = ext4_chksum(sbi, ~0, (char *)es, offset);
 290
 291         return cpu_to_le32(csum);
 292 }
 293
 294 static int ext4_superblock_csum_verify(struct super_block *sb,
 295                                        struct ext4_super_block *es)
 296 {
 297         if (!ext4_has_metadata_csum(sb))
 298                 return 1;
 299
 300         return es->s_checksum == ext4_superblock_csum(sb, es);
 301 }
 302
 303 void ext4_superblock_csum_set(struct super_block *sb)
 304 {
 305         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
 306
 307         if (!ext4_has_metadata_csum(sb))
 308                 return;
 309
 310         es->s_checksum = ext4_superblock_csum(sb, es);
 311 }
 312
 313 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
 314                                struct ext4_group_desc *bg)
 315 {
 316         return le32_to_cpu(bg->bg_block_bitmap_lo) |
 317                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 318                  (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
 319 }
 320
 321 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
 322                                struct ext4_group_desc *bg)
 323 {
 324         return le32_to_cpu(bg->bg_inode_bitmap_lo) |
 325                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 326                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
 327 }
 328
 329 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
 330                               struct ext4_group_desc *bg)
 331 {
 332         return le32_to_cpu(bg->bg_inode_table_lo) |
 333                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 334                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
 335 }
 336
 337 __u32 ext4_free_group_clusters(struct super_block *sb,
 338                                struct ext4_group_desc *bg)
 339 {
 340         return le16_to_cpu(bg->bg_free_blocks_count_lo) |
 341                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 342                  (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
 343 }
 344
 345 __u32 ext4_free_inodes_count(struct super_block *sb,
 346                               struct ext4_group_desc *bg)
 347 {
 348         return le16_to_cpu(bg->bg_free_inodes_count_lo) |
 349                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 350                  (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
 351 }
 352
 353 __u32 ext4_used_dirs_count(struct super_block *sb,
 354                               struct ext4_group_desc *bg)
 355 {
 356         return le16_to_cpu(bg->bg_used_dirs_count_lo) |
 357                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 358                  (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
 359 }
 360
 361 __u32 ext4_itable_unused_count(struct super_block *sb,
 362                               struct ext4_group_desc *bg)
 363 {
 364         return le16_to_cpu(bg->bg_itable_unused_lo) |
 365                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 366                  (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
 367 }
 368
 369 void ext4_block_bitmap_set(struct super_block *sb,
 370                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
 371 {
 372         bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
 373         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 374                 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
 375 }
 376
 377 void ext4_inode_bitmap_set(struct super_block *sb,
 378                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
 379 {
 380         bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
 381         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 382                 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
 383 }
 384
 385 void ext4_inode_table_set(struct super_block *sb,
 386                           struct ext4_group_desc *bg, ext4_fsblk_t blk)
 387 {
 388         bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
 389         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 390                 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
 391 }
 392
 393 void ext4_free_group_clusters_set(struct super_block *sb,
 394                                   struct ext4_group_desc *bg, __u32 count)
 395 {
 396         bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
 397         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 398                 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
 399 }
 400
 401 void ext4_free_inodes_set(struct super_block *sb,
 402                           struct ext4_group_desc *bg, __u32 count)
 403 {
 404         bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
 405         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 406                 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
 407 }
 408
 409 void ext4_used_dirs_set(struct super_block *sb,
 410                           struct ext4_group_desc *bg, __u32 count)
 411 {
 412         bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
 413         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 414                 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
 415 }
 416
 417 void ext4_itable_unused_set(struct super_block *sb,
 418                           struct ext4_group_desc *bg, __u32 count)
 419 {
 420         bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
 421         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 422                 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
 423 }
 424
 425 static void __ext4_update_tstamp(__le32 *lo, __u8 *hi, time64_t now)
 426 {
 427         now = clamp_val(now, 0, (1ull << 40) - 1);
 428
 429         *lo = cpu_to_le32(lower_32_bits(now));
 430         *hi = upper_32_bits(now);
 431 }
 432
 433 static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
 434 {
 435         return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
 436 }
 437 #define ext4_update_tstamp(es, tstamp) \
 438         __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi, \
 439                              ktime_get_real_seconds())
 440 #define ext4_get_tstamp(es, tstamp) \
 441         __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
 442
 443 /*
 444  * The del_gendisk() function uninitializes the disk-specific data
 445  * structures, including the bdi structure, without telling anyone
 446  * else.  Once this happens, any attempt to call mark_buffer_dirty()
 447  * (for example, by ext4_commit_super), will cause a kernel OOPS.
 448  * This is a kludge to prevent these oops until we can put in a proper
 449  * hook in del_gendisk() to inform the VFS and file system layers.
 450  */
 451 static int block_device_ejected(struct super_block *sb)
 452 {
 453         struct inode *bd_inode = sb->s_bdev->bd_inode;
 454         struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
 455
 456         return bdi->dev == NULL;
 457 }
 458
 459 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
 460 {
 461         struct super_block              *sb = journal->j_private;
 462         struct ext4_sb_info             *sbi = EXT4_SB(sb);
 463         int                             error = is_journal_aborted(journal);
 464         struct ext4_journal_cb_entry    *jce;
 465
 466         BUG_ON(txn->t_state == T_FINISHED);
 467
 468         ext4_process_freed_data(sb, txn->t_tid);
 469
 470         spin_lock(&sbi->s_md_lock);
 471         while (!list_empty(&txn->t_private_list)) {
 472                 jce = list_entry(txn->t_private_list.next,
 473                                  struct ext4_journal_cb_entry, jce_list);
 474                 list_del_init(&jce->jce_list);
 475                 spin_unlock(&sbi->s_md_lock);
 476                 jce->jce_func(sb, jce, error);
 477                 spin_lock(&sbi->s_md_lock);
 478         }
 479         spin_unlock(&sbi->s_md_lock);
 480 }
 481
 482 /*
 483  * This writepage callback for write_cache_pages()
 484  * takes care of a few cases after page cleaning.
 485  *
 486  * write_cache_pages() already checks for dirty pages
 487  * and calls clear_page_dirty_for_io(), which we want,
 488  * to write protect the pages.
 489  *
 490  * However, we may have to redirty a page (see below.)
 491  */
 492 static int ext4_journalled_writepage_callback(struct page *page,
 493                                               struct writeback_control *wbc,
 494                                               void *data)
 495 {
 496         transaction_t *transaction = (transaction_t *) data;
 497         struct buffer_head *bh, *head;
 498         struct journal_head *jh;
 499
 500         bh = head = page_buffers(page);
 501         do {
 502                 /*
 503                  * We have to redirty a page in these cases:
 504                  * 1) If buffer is dirty, it means the page was dirty because it
 505                  * contains a buffer that needs checkpointing. So the dirty bit
 506                  * needs to be preserved so that checkpointing writes the buffer
 507                  * properly.
 508                  * 2) If buffer is not part of the committing transaction
 509                  * (we may have just accidentally come across this buffer because
 510                  * inode range tracking is not exact) or if the currently running
 511                  * transaction already contains this buffer as well, dirty bit
 512                  * needs to be preserved so that the buffer gets writeprotected
 513                  * properly on running transaction's commit.
 514                  */
 515                 jh = bh2jh(bh);
 516                 if (buffer_dirty(bh) ||
 517                     (jh && (jh->b_transaction != transaction ||
 518                             jh->b_next_transaction))) {
 519                         redirty_page_for_writepage(wbc, page);
 520                         goto out;
 521                 }
 522         } while ((bh = bh->b_this_page) != head);
 523
 524 out:
 525         return AOP_WRITEPAGE_ACTIVATE;
 526 }
 527
 528 static int ext4_journalled_submit_inode_data_buffers(struct jbd2_inode *jinode)
 529 {
 530         struct address_space *mapping = jinode->i_vfs_inode->i_mapping;
 531         struct writeback_control wbc = {
 532                 .sync_mode =  WB_SYNC_ALL,
 533                 .nr_to_write = LONG_MAX,
 534                 .range_start = jinode->i_dirty_start,
 535                 .range_end = jinode->i_dirty_end,
 536         };
 537
 538         return write_cache_pages(mapping, &wbc,
 539                                  ext4_journalled_writepage_callback,
 540                                  jinode->i_transaction);
 541 }
 542
 543 static int ext4_journal_submit_inode_data_buffers(struct jbd2_inode *jinode)
 544 {
 545         int ret;
 546
 547         if (ext4_should_journal_data(jinode->i_vfs_inode))
 548                 ret = ext4_journalled_submit_inode_data_buffers(jinode);
 549         else
 550                 ret = jbd2_journal_submit_inode_data_buffers(jinode);
 551
 552         return ret;
 553 }
 554
 555 static int ext4_journal_finish_inode_data_buffers(struct jbd2_inode *jinode)
 556 {
 557         int ret = 0;
 558
 559         if (!ext4_should_journal_data(jinode->i_vfs_inode))
 560                 ret = jbd2_journal_finish_inode_data_buffers(jinode);
 561
 562         return ret;
 563 }
 564
 565 static bool system_going_down(void)
 566 {
 567         return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
 568                 || system_state == SYSTEM_RESTART;
 569 }
 570
 571 struct ext4_err_translation {
 572         int code;
 573         int errno;
 574 };
 575
 576 #define EXT4_ERR_TRANSLATE(err) { .code = EXT4_ERR_##err, .errno = err }
 577
 578 static struct ext4_err_translation err_translation[] = {
 579         EXT4_ERR_TRANSLATE(EIO),
 580         EXT4_ERR_TRANSLATE(ENOMEM),
 581         EXT4_ERR_TRANSLATE(EFSBADCRC),
 582         EXT4_ERR_TRANSLATE(EFSCORRUPTED),
 583         EXT4_ERR_TRANSLATE(ENOSPC),
 584         EXT4_ERR_TRANSLATE(ENOKEY),
 585         EXT4_ERR_TRANSLATE(EROFS),
 586         EXT4_ERR_TRANSLATE(EFBIG),
 587         EXT4_ERR_TRANSLATE(EEXIST),
 588         EXT4_ERR_TRANSLATE(ERANGE),
 589         EXT4_ERR_TRANSLATE(EOVERFLOW),
 590         EXT4_ERR_TRANSLATE(EBUSY),
 591         EXT4_ERR_TRANSLATE(ENOTDIR),
 592         EXT4_ERR_TRANSLATE(ENOTEMPTY),
 593         EXT4_ERR_TRANSLATE(ESHUTDOWN),
 594         EXT4_ERR_TRANSLATE(EFAULT),
 595 };
 596
 597 static int ext4_errno_to_code(int errno)
 598 {
 599         int i;
 600
 601         for (i = 0; i < ARRAY_SIZE(err_translation); i++)
 602                 if (err_translation[i].errno == errno)
 603                         return err_translation[i].code;
 604         return EXT4_ERR_UNKNOWN;
 605 }
 606
 607 static void save_error_info(struct super_block *sb, int error,
 608                             __u32 ino, __u64 block,
 609                             const char *func, unsigned int line)
 610 {
 611         struct ext4_sb_info *sbi = EXT4_SB(sb);
 612
 613         /* We default to EFSCORRUPTED error... */
 614         if (error == 0)
 615                 error = EFSCORRUPTED;
 616
 617         spin_lock(&sbi->s_error_lock);
 618         sbi->s_add_error_count++;
 619         sbi->s_last_error_code = error;
 620         sbi->s_last_error_line = line;
 621         sbi->s_last_error_ino = ino;
 622         sbi->s_last_error_block = block;
 623         sbi->s_last_error_func = func;
 624         sbi->s_last_error_time = ktime_get_real_seconds();
 625         if (!sbi->s_first_error_time) {
 626                 sbi->s_first_error_code = error;
 627                 sbi->s_first_error_line = line;
 628                 sbi->s_first_error_ino = ino;
 629                 sbi->s_first_error_block = block;
 630                 sbi->s_first_error_func = func;
 631                 sbi->s_first_error_time = sbi->s_last_error_time;
 632         }
 633         spin_unlock(&sbi->s_error_lock);
 634 }
 635
 636 /* Deal with the reporting of failure conditions on a filesystem such as
 637  * inconsistencies detected or read IO failures.
 638  *
 639  * On ext2, we can store the error state of the filesystem in the
 640  * superblock.  That is not possible on ext4, because we may have other
 641  * write ordering constraints on the superblock which prevent us from
 642  * writing it out straight away; and given that the journal is about to
 643  * be aborted, we can't rely on the current, or future, transactions to
 644  * write out the superblock safely.
 645  *
 646  * We'll just use the jbd2_journal_abort() error code to record an error in
 647  * the journal instead.  On recovery, the journal will complain about
 648  * that error until we've noted it down and cleared it.
 649  *
 650  * If force_ro is set, we unconditionally force the filesystem into an
 651  * ABORT|READONLY state, unless the error response on the fs has been set to
 652  * panic in which case we take the easy way out and panic immediately. This is
 653  * used to deal with unrecoverable failures such as journal IO errors or ENOMEM
 654  * at a critical moment in log management.
 655  */
 656 static void ext4_handle_error(struct super_block *sb, bool force_ro, int error,
 657                               __u32 ino, __u64 block,
 658                               const char *func, unsigned int line)
 659 {
 660         journal_t *journal = EXT4_SB(sb)->s_journal;
 661         bool continue_fs = !force_ro && test_opt(sb, ERRORS_CONT);
 662
 663         EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
 664         if (test_opt(sb, WARN_ON_ERROR))
 665                 WARN_ON_ONCE(1);
 666
 667         if (!continue_fs && !sb_rdonly(sb)) {
 668                 ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED);
 669                 if (journal)
 670                         jbd2_journal_abort(journal, -EIO);
 671         }
 672
 673         if (!bdev_read_only(sb->s_bdev)) {
 674                 save_error_info(sb, error, ino, block, func, line);
 675                 /*
 676                  * In case the fs should keep running, we need to writeout
 677                  * superblock through the journal. Due to lock ordering
 678                  * constraints, it may not be safe to do it right here so we
 679                  * defer superblock flushing to a workqueue.
 680                  */
 681                 if (continue_fs && journal)
 682                         schedule_work(&EXT4_SB(sb)->s_error_work);
 683                 else
 684                         ext4_commit_super(sb);
 685         }
 686
 687         /*
 688          * We force ERRORS_RO behavior when system is rebooting. Otherwise we
 689          * could panic during 'reboot -f' as the underlying device got already
 690          * disabled.
 691          */
 692         if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
 693                 panic("EXT4-fs (device %s): panic forced after error\n",
 694                         sb->s_id);
 695         }
 696
 697         if (sb_rdonly(sb) || continue_fs)
 698                 return;
 699
 700         ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
 701         /*
 702          * Make sure updated value of ->s_mount_flags will be visible before
 703          * ->s_flags update
 704          */
 705         smp_wmb();
 706         sb->s_flags |= SB_RDONLY;
 707 }
 708
 709 static void flush_stashed_error_work(struct work_struct *work)
 710 {
 711         struct ext4_sb_info *sbi = container_of(work, struct ext4_sb_info,
 712                                                 s_error_work);
 713         journal_t *journal = sbi->s_journal;
 714         handle_t *handle;
 715
 716         /*
 717          * If the journal is still running, we have to write out superblock
 718          * through the journal to avoid collisions of other journalled sb
 719          * updates.
 720          *
 721          * We use directly jbd2 functions here to avoid recursing back into
 722          * ext4 error handling code during handling of previous errors.
 723          */
 724         if (!sb_rdonly(sbi->s_sb) && journal) {
 725                 struct buffer_head *sbh = sbi->s_sbh;
 726                 handle = jbd2_journal_start(journal, 1);
 727                 if (IS_ERR(handle))
 728                         goto write_directly;
 729                 if (jbd2_journal_get_write_access(handle, sbh)) {
 730                         jbd2_journal_stop(handle);
 731                         goto write_directly;
 732                 }
 733                 ext4_update_super(sbi->s_sb);
 734                 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
 735                         ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to "
 736                                  "superblock detected");
 737                         clear_buffer_write_io_error(sbh);
 738                         set_buffer_uptodate(sbh);
 739                 }
 740
 741                 if (jbd2_journal_dirty_metadata(handle, sbh)) {
 742                         jbd2_journal_stop(handle);
 743                         goto write_directly;
 744                 }
 745                 jbd2_journal_stop(handle);
 746                 ext4_notify_error_sysfs(sbi);
 747                 return;
 748         }
 749 write_directly:
 750         /*
 751          * Write through journal failed. Write sb directly to get error info
 752          * out and hope for the best.
 753          */
 754         ext4_commit_super(sbi->s_sb);
 755         ext4_notify_error_sysfs(sbi);
 756 }
 757
 758 #define ext4_error_ratelimit(sb)                                        \
 759                 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state),     \
 760                              "EXT4-fs error")
 761
 762 void __ext4_error(struct super_block *sb, const char *function,
 763                   unsigned int line, bool force_ro, int error, __u64 block,
 764                   const char *fmt, ...)
 765 {
 766         struct va_format vaf;
 767         va_list args;
 768
 769         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 770                 return;
 771
 772         trace_ext4_error(sb, function, line);
 773         if (ext4_error_ratelimit(sb)) {
 774                 va_start(args, fmt);
 775                 vaf.fmt = fmt;
 776                 vaf.va = &args;
 777                 printk(KERN_CRIT
 778                        "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
 779                        sb->s_id, function, line, current->comm, &vaf);
 780                 va_end(args);
 781         }
 782         fsnotify_sb_error(sb, NULL, error ? error : EFSCORRUPTED);
 783
 784         ext4_handle_error(sb, force_ro, error, 0, block, function, line);
 785 }
 786
 787 void __ext4_error_inode(struct inode *inode, const char *function,
 788                         unsigned int line, ext4_fsblk_t block, int error,
 789                         const char *fmt, ...)
 790 {
 791         va_list args;
 792         struct va_format vaf;
 793
 794         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 795                 return;
 796
 797         trace_ext4_error(inode->i_sb, function, line);
 798         if (ext4_error_ratelimit(inode->i_sb)) {
 799                 va_start(args, fmt);
 800                 vaf.fmt = fmt;
 801                 vaf.va = &args;
 802                 if (block)
 803                         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
 804                                "inode #%lu: block %llu: comm %s: %pV\n",
 805                                inode->i_sb->s_id, function, line, inode->i_ino,
 806                                block, current->comm, &vaf);
 807                 else
 808                         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
 809                                "inode #%lu: comm %s: %pV\n",
 810                                inode->i_sb->s_id, function, line, inode->i_ino,
 811                                current->comm, &vaf);
 812                 va_end(args);
 813         }
 814         fsnotify_sb_error(inode->i_sb, inode, error ? error : EFSCORRUPTED);
 815
 816         ext4_handle_error(inode->i_sb, false, error, inode->i_ino, block,
 817                           function, line);
 818 }
 819
 820 void __ext4_error_file(struct file *file, const char *function,
 821                        unsigned int line, ext4_fsblk_t block,
 822                        const char *fmt, ...)
 823 {
 824         va_list args;
 825         struct va_format vaf;
 826         struct inode *inode = file_inode(file);
 827         char pathname[80], *path;
 828
 829         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 830                 return;
 831
 832         trace_ext4_error(inode->i_sb, function, line);
 833         if (ext4_error_ratelimit(inode->i_sb)) {
 834                 path = file_path(file, pathname, sizeof(pathname));
 835                 if (IS_ERR(path))
 836                         path = "(unknown)";
 837                 va_start(args, fmt);
 838                 vaf.fmt = fmt;
 839                 vaf.va = &args;
 840                 if (block)
 841                         printk(KERN_CRIT
 842                                "EXT4-fs error (device %s): %s:%d: inode #%lu: "
 843                                "block %llu: comm %s: path %s: %pV\n",
 844                                inode->i_sb->s_id, function, line, inode->i_ino,
 845                                block, current->comm, path, &vaf);
 846                 else
 847                         printk(KERN_CRIT
 848                                "EXT4-fs error (device %s): %s:%d: inode #%lu: "
 849                                "comm %s: path %s: %pV\n",
 850                                inode->i_sb->s_id, function, line, inode->i_ino,
 851                                current->comm, path, &vaf);
 852                 va_end(args);
 853         }
 854         fsnotify_sb_error(inode->i_sb, inode, EFSCORRUPTED);
 855
 856         ext4_handle_error(inode->i_sb, false, EFSCORRUPTED, inode->i_ino, block,
 857                           function, line);
 858 }
 859
 860 const char *ext4_decode_error(struct super_block *sb, int errno,
 861                               char nbuf[16])
 862 {
 863         char *errstr = NULL;
 864
 865         switch (errno) {
 866         case -EFSCORRUPTED:
 867                 errstr = "Corrupt filesystem";
 868                 break;
 869         case -EFSBADCRC:
 870                 errstr = "Filesystem failed CRC";
 871                 break;
 872         case -EIO:
 873                 errstr = "IO failure";
 874                 break;
 875         case -ENOMEM:
 876                 errstr = "Out of memory";
 877                 break;
 878         case -EROFS:
 879                 if (!sb || (EXT4_SB(sb)->s_journal &&
 880                             EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
 881                         errstr = "Journal has aborted";
 882                 else
 883                         errstr = "Readonly filesystem";
 884                 break;
 885         default:
 886                 /* If the caller passed in an extra buffer for unknown
 887                  * errors, textualise them now.  Else we just return
 888                  * NULL. */
 889                 if (nbuf) {
 890                         /* Check for truncated error codes... */
 891                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 892                                 errstr = nbuf;
 893                 }
 894                 break;
 895         }
 896
 897         return errstr;
 898 }
 899
 900 /* __ext4_std_error decodes expected errors from journaling functions
 901  * automatically and invokes the appropriate error response.  */
 902
 903 void __ext4_std_error(struct super_block *sb, const char *function,
 904                       unsigned int line, int errno)
 905 {
 906         char nbuf[16];
 907         const char *errstr;
 908
 909         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 910                 return;
 911
 912         /* Special case: if the error is EROFS, and we're not already
 913          * inside a transaction, then there's really no point in logging
 914          * an error. */
 915         if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
 916                 return;
 917
 918         if (ext4_error_ratelimit(sb)) {
 919                 errstr = ext4_decode_error(sb, errno, nbuf);
 920                 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
 921                        sb->s_id, function, line, errstr);
 922         }
 923         fsnotify_sb_error(sb, NULL, errno ? errno : EFSCORRUPTED);
 924
 925         ext4_handle_error(sb, false, -errno, 0, 0, function, line);
 926 }
 927
 928 void __ext4_msg(struct super_block *sb,
 929                 const char *prefix, const char *fmt, ...)
 930 {
 931         struct va_format vaf;
 932         va_list args;
 933
 934         if (sb) {
 935                 atomic_inc(&EXT4_SB(sb)->s_msg_count);
 936                 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state),
 937                                   "EXT4-fs"))
 938                         return;
 939         }
 940
 941         va_start(args, fmt);
 942         vaf.fmt = fmt;
 943         vaf.va = &args;
 944         if (sb)
 945                 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
 946         else
 947                 printk("%sEXT4-fs: %pV\n", prefix, &vaf);
 948         va_end(args);
 949 }
 950
 951 static int ext4_warning_ratelimit(struct super_block *sb)
 952 {
 953         atomic_inc(&EXT4_SB(sb)->s_warning_count);
 954         return ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
 955                             "EXT4-fs warning");
 956 }
 957
 958 void __ext4_warning(struct super_block *sb, const char *function,
 959                     unsigned int line, const char *fmt, ...)
 960 {
 961         struct va_format vaf;
 962         va_list args;
 963
 964         if (!ext4_warning_ratelimit(sb))
 965                 return;
 966
 967         va_start(args, fmt);
 968         vaf.fmt = fmt;
 969         vaf.va = &args;
 970         printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
 971                sb->s_id, function, line, &vaf);
 972         va_end(args);
 973 }
 974
 975 void __ext4_warning_inode(const struct inode *inode, const char *function,
 976                           unsigned int line, const char *fmt, ...)
 977 {
 978         struct va_format vaf;
 979         va_list args;
 980
 981         if (!ext4_warning_ratelimit(inode->i_sb))
 982                 return;
 983
 984         va_start(args, fmt);
 985         vaf.fmt = fmt;
 986         vaf.va = &args;
 987         printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
 988                "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
 989                function, line, inode->i_ino, current->comm, &vaf);
 990         va_end(args);
 991 }
 992
 993 void __ext4_grp_locked_error(const char *function, unsigned int line,
 994                              struct super_block *sb, ext4_group_t grp,
 995                              unsigned long ino, ext4_fsblk_t block,
 996                              const char *fmt, ...)
 997 __releases(bitlock)
 998 __acquires(bitlock)
 999 {
1000         struct va_format vaf;
1001         va_list args;
1002
1003         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
1004                 return;
1005
1006         trace_ext4_error(sb, function, line);
1007         if (ext4_error_ratelimit(sb)) {
1008                 va_start(args, fmt);
1009                 vaf.fmt = fmt;
1010                 vaf.va = &args;
1011                 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
1012                        sb->s_id, function, line, grp);
1013                 if (ino)
1014                         printk(KERN_CONT "inode %lu: ", ino);
1015                 if (block)
1016                         printk(KERN_CONT "block %llu:",
1017                                (unsigned long long) block);
1018                 printk(KERN_CONT "%pV\n", &vaf);
1019                 va_end(args);
1020         }
1021
1022         if (test_opt(sb, ERRORS_CONT)) {
1023                 if (test_opt(sb, WARN_ON_ERROR))
1024                         WARN_ON_ONCE(1);
1025                 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1026                 if (!bdev_read_only(sb->s_bdev)) {
1027                         save_error_info(sb, EFSCORRUPTED, ino, block, function,
1028                                         line);
1029                         schedule_work(&EXT4_SB(sb)->s_error_work);
1030                 }
1031                 return;
1032         }
1033         ext4_unlock_group(sb, grp);
1034         ext4_handle_error(sb, false, EFSCORRUPTED, ino, block, function, line);
1035         /*
1036          * We only get here in the ERRORS_RO case; relocking the group
1037          * may be dangerous, but nothing bad will happen since the
1038          * filesystem will have already been marked read/only and the
1039          * journal has been aborted.  We return 1 as a hint to callers
1040          * who might what to use the return value from
1041          * ext4_grp_locked_error() to distinguish between the
1042          * ERRORS_CONT and ERRORS_RO case, and perhaps return more
1043          * aggressively from the ext4 function in question, with a
1044          * more appropriate error code.
1045          */
1046         ext4_lock_group(sb, grp);
1047         return;
1048 }
1049
1050 void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
1051                                      ext4_group_t group,
1052                                      unsigned int flags)
1053 {
1054         struct ext4_sb_info *sbi = EXT4_SB(sb);
1055         struct ext4_group_info *grp = ext4_get_group_info(sb, group);
1056         struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
1057         int ret;
1058
1059         if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
1060                 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
1061                                             &grp->bb_state);
1062                 if (!ret)
1063                         percpu_counter_sub(&sbi->s_freeclusters_counter,
1064                                            grp->bb_free);
1065         }
1066
1067         if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
1068                 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
1069                                             &grp->bb_state);
1070                 if (!ret && gdp) {
1071                         int count;
1072
1073                         count = ext4_free_inodes_count(sb, gdp);
1074                         percpu_counter_sub(&sbi->s_freeinodes_counter,
1075                                            count);
1076                 }
1077         }
1078 }
1079
1080 void ext4_update_dynamic_rev(struct super_block *sb)
1081 {
1082         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1083
1084         if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
1085                 return;
1086
1087         ext4_warning(sb,
1088                      "updating to rev %d because of new feature flag, "
1089                      "running e2fsck is recommended",
1090                      EXT4_DYNAMIC_REV);
1091
1092         es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
1093         es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
1094         es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
1095         /* leave es->s_feature_*compat flags alone */
1096         /* es->s_uuid will be set by e2fsck if empty */
1097
1098         /*
1099          * The rest of the superblock fields should be zero, and if not it
1100          * means they are likely already in use, so leave them alone.  We
1101          * can leave it up to e2fsck to clean up any inconsistencies there.
1102          */
1103 }
1104
1105 /*
1106  * Open the external journal device
1107  */
1108 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
1109 {
1110         struct block_device *bdev;
1111
1112         bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
1113         if (IS_ERR(bdev))
1114                 goto fail;
1115         return bdev;
1116
1117 fail:
1118         ext4_msg(sb, KERN_ERR,
1119                  "failed to open journal device unknown-block(%u,%u) %ld",
1120                  MAJOR(dev), MINOR(dev), PTR_ERR(bdev));
1121         return NULL;
1122 }
1123
1124 /*
1125  * Release the journal device
1126  */
1127 static void ext4_blkdev_put(struct block_device *bdev)
1128 {
1129         blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1130 }
1131
1132 static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
1133 {
1134         struct block_device *bdev;
1135         bdev = sbi->s_journal_bdev;
1136         if (bdev) {
1137                 ext4_blkdev_put(bdev);
1138                 sbi->s_journal_bdev = NULL;
1139         }
1140 }
1141
1142 static inline struct inode *orphan_list_entry(struct list_head *l)
1143 {
1144         return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
1145 }
1146
1147 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
1148 {
1149         struct list_head *l;
1150
1151         ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
1152                  le32_to_cpu(sbi->s_es->s_last_orphan));
1153
1154         printk(KERN_ERR "sb_info orphan list:\n");
1155         list_for_each(l, &sbi->s_orphan) {
1156                 struct inode *inode = orphan_list_entry(l);
1157                 printk(KERN_ERR "  "
1158                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1159                        inode->i_sb->s_id, inode->i_ino, inode,
1160                        inode->i_mode, inode->i_nlink,
1161                        NEXT_ORPHAN(inode));
1162         }
1163 }
1164
1165 #ifdef CONFIG_QUOTA
1166 static int ext4_quota_off(struct super_block *sb, int type);
1167
1168 static inline void ext4_quota_off_umount(struct super_block *sb)
1169 {
1170         int type;
1171
1172         /* Use our quota_off function to clear inode flags etc. */
1173         for (type = 0; type < EXT4_MAXQUOTAS; type++)
1174                 ext4_quota_off(sb, type);
1175 }
1176
1177 /*
1178  * This is a helper function which is used in the mount/remount
1179  * codepaths (which holds s_umount) to fetch the quota file name.
1180  */
1181 static inline char *get_qf_name(struct super_block *sb,
1182                                 struct ext4_sb_info *sbi,
1183                                 int type)
1184 {
1185         return rcu_dereference_protected(sbi->s_qf_names[type],
1186                                          lockdep_is_held(&sb->s_umount));
1187 }
1188 #else
1189 static inline void ext4_quota_off_umount(struct super_block *sb)
1190 {
1191 }
1192 #endif
1193
1194 static void ext4_put_super(struct super_block *sb)
1195 {
1196         struct ext4_sb_info *sbi = EXT4_SB(sb);
1197         struct ext4_super_block *es = sbi->s_es;
1198         struct buffer_head **group_desc;
1199         struct flex_groups **flex_groups;
1200         int aborted = 0;
1201         int i, err;
1202
1203         ext4_unregister_li_request(sb);
1204         ext4_quota_off_umount(sb);
1205
1206         flush_work(&sbi->s_error_work);
1207         destroy_workqueue(sbi->rsv_conversion_wq);
1208         ext4_release_orphan_info(sb);
1209
1210         /*
1211          * Unregister sysfs before destroying jbd2 journal.
1212          * Since we could still access attr_journal_task attribute via sysfs
1213          * path which could have sbi->s_journal->j_task as NULL
1214          */
1215         ext4_unregister_sysfs(sb);
1216
1217         if (sbi->s_journal) {
1218                 aborted = is_journal_aborted(sbi->s_journal);
1219                 err = jbd2_journal_destroy(sbi->s_journal);
1220                 sbi->s_journal = NULL;
1221                 if ((err < 0) && !aborted) {
1222                         ext4_abort(sb, -err, "Couldn't clean up the journal");
1223                 }
1224         }
1225
1226         ext4_es_unregister_shrinker(sbi);
1227         del_timer_sync(&sbi->s_err_report);
1228         ext4_release_system_zone(sb);
1229         ext4_mb_release(sb);
1230         ext4_ext_release(sb);
1231
1232         if (!sb_rdonly(sb) && !aborted) {
1233                 ext4_clear_feature_journal_needs_recovery(sb);
1234                 ext4_clear_feature_orphan_present(sb);
1235                 es->s_state = cpu_to_le16(sbi->s_mount_state);
1236         }
1237         if (!sb_rdonly(sb))
1238                 ext4_commit_super(sb);
1239
1240         rcu_read_lock();
1241         group_desc = rcu_dereference(sbi->s_group_desc);
1242         for (i = 0; i < sbi->s_gdb_count; i++)
1243                 brelse(group_desc[i]);
1244         kvfree(group_desc);
1245         flex_groups = rcu_dereference(sbi->s_flex_groups);
1246         if (flex_groups) {
1247                 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
1248                         kvfree(flex_groups[i]);
1249                 kvfree(flex_groups);
1250         }
1251         rcu_read_unlock();
1252         percpu_counter_destroy(&sbi->s_freeclusters_counter);
1253         percpu_counter_destroy(&sbi->s_freeinodes_counter);
1254         percpu_counter_destroy(&sbi->s_dirs_counter);
1255         percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1256         percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit);
1257         percpu_free_rwsem(&sbi->s_writepages_rwsem);
1258 #ifdef CONFIG_QUOTA
1259         for (i = 0; i < EXT4_MAXQUOTAS; i++)
1260                 kfree(get_qf_name(sb, sbi, i));
1261 #endif
1262
1263         /* Debugging code just in case the in-memory inode orphan list
1264          * isn't empty.  The on-disk one can be non-empty if we've
1265          * detected an error and taken the fs readonly, but the
1266          * in-memory list had better be clean by this point. */
1267         if (!list_empty(&sbi->s_orphan))
1268                 dump_orphan_list(sb, sbi);
1269         ASSERT(list_empty(&sbi->s_orphan));
1270
1271         sync_blockdev(sb->s_bdev);
1272         invalidate_bdev(sb->s_bdev);
1273         if (sbi->s_journal_bdev && sbi->s_journal_bdev != sb->s_bdev) {
1274                 /*
1275                  * Invalidate the journal device's buffers.  We don't want them
1276                  * floating about in memory - the physical journal device may
1277                  * hotswapped, and it breaks the `ro-after' testing code.
1278                  */
1279                 sync_blockdev(sbi->s_journal_bdev);
1280                 invalidate_bdev(sbi->s_journal_bdev);
1281                 ext4_blkdev_remove(sbi);
1282         }
1283
1284         ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1285         sbi->s_ea_inode_cache = NULL;
1286
1287         ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1288         sbi->s_ea_block_cache = NULL;
1289
1290         ext4_stop_mmpd(sbi);
1291
1292         brelse(sbi->s_sbh);
1293         sb->s_fs_info = NULL;
1294         /*
1295          * Now that we are completely done shutting down the
1296          * superblock, we need to actually destroy the kobject.
1297          */
1298         kobject_put(&sbi->s_kobj);
1299         wait_for_completion(&sbi->s_kobj_unregister);
1300         if (sbi->s_chksum_driver)
1301                 crypto_free_shash(sbi->s_chksum_driver);
1302         kfree(sbi->s_blockgroup_lock);
1303         fs_put_dax(sbi->s_daxdev);
1304         fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
1305 #ifdef CONFIG_UNICODE
1306         utf8_unload(sb->s_encoding);
1307 #endif
1308         kfree(sbi);
1309 }
1310
1311 static struct kmem_cache *ext4_inode_cachep;
1312
1313 /*
1314  * Called inside transaction, so use GFP_NOFS
1315  */
1316 static struct inode *ext4_alloc_inode(struct super_block *sb)
1317 {
1318         struct ext4_inode_info *ei;
1319
1320         ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
1321         if (!ei)
1322                 return NULL;
1323
1324         inode_set_iversion(&ei->vfs_inode, 1);
1325         spin_lock_init(&ei->i_raw_lock);
1326         INIT_LIST_HEAD(&ei->i_prealloc_list);
1327         atomic_set(&ei->i_prealloc_active, 0);
1328         spin_lock_init(&ei->i_prealloc_lock);
1329         ext4_es_init_tree(&ei->i_es_tree);
1330         rwlock_init(&ei->i_es_lock);
1331         INIT_LIST_HEAD(&ei->i_es_list);
1332         ei->i_es_all_nr = 0;
1333         ei->i_es_shk_nr = 0;
1334         ei->i_es_shrink_lblk = 0;
1335         ei->i_reserved_data_blocks = 0;
1336         spin_lock_init(&(ei->i_block_reservation_lock));
1337         ext4_init_pending_tree(&ei->i_pending_tree);
1338 #ifdef CONFIG_QUOTA
1339         ei->i_reserved_quota = 0;
1340         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
1341 #endif
1342         ei->jinode = NULL;
1343         INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
1344         spin_lock_init(&ei->i_completed_io_lock);
1345         ei->i_sync_tid = 0;
1346         ei->i_datasync_tid = 0;
1347         atomic_set(&ei->i_unwritten, 0);
1348         INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
1349         ext4_fc_init_inode(&ei->vfs_inode);
1350         mutex_init(&ei->i_fc_lock);
1351         return &ei->vfs_inode;
1352 }
1353
1354 static int ext4_drop_inode(struct inode *inode)
1355 {
1356         int drop = generic_drop_inode(inode);
1357
1358         if (!drop)
1359                 drop = fscrypt_drop_inode(inode);
1360
1361         trace_ext4_drop_inode(inode, drop);
1362         return drop;
1363 }
1364
1365 static void ext4_free_in_core_inode(struct inode *inode)
1366 {
1367         fscrypt_free_inode(inode);
1368         if (!list_empty(&(EXT4_I(inode)->i_fc_list))) {
1369                 pr_warn("%s: inode %ld still in fc list",
1370                         __func__, inode->i_ino);
1371         }
1372         kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1373 }
1374
1375 static void ext4_destroy_inode(struct inode *inode)
1376 {
1377         if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
1378                 ext4_msg(inode->i_sb, KERN_ERR,
1379                          "Inode %lu (%p): orphan list check failed!",
1380                          inode->i_ino, EXT4_I(inode));
1381                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1382                                 EXT4_I(inode), sizeof(struct ext4_inode_info),
1383                                 true);
1384                 dump_stack();
1385         }
1386
1387         if (EXT4_I(inode)->i_reserved_data_blocks)
1388                 ext4_msg(inode->i_sb, KERN_ERR,
1389                          "Inode %lu (%p): i_reserved_data_blocks (%u) not cleared!",
1390                          inode->i_ino, EXT4_I(inode),
1391                          EXT4_I(inode)->i_reserved_data_blocks);
1392 }
1393
1394 static void init_once(void *foo)
1395 {
1396         struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
1397
1398         INIT_LIST_HEAD(&ei->i_orphan);
1399         init_rwsem(&ei->xattr_sem);
1400         init_rwsem(&ei->i_data_sem);
1401         inode_init_once(&ei->vfs_inode);
1402         ext4_fc_init_inode(&ei->vfs_inode);
1403 }
1404
1405 static int __init init_inodecache(void)
1406 {
1407         ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1408                                 sizeof(struct ext4_inode_info), 0,
1409                                 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1410                                         SLAB_ACCOUNT),
1411                                 offsetof(struct ext4_inode_info, i_data),
1412                                 sizeof_field(struct ext4_inode_info, i_data),
1413                                 init_once);
1414         if (ext4_inode_cachep == NULL)
1415                 return -ENOMEM;
1416         return 0;
1417 }
1418
1419 static void destroy_inodecache(void)
1420 {
1421         /*
1422          * Make sure all delayed rcu free inodes are flushed before we
1423          * destroy cache.
1424          */
1425         rcu_barrier();
1426         kmem_cache_destroy(ext4_inode_cachep);
1427 }
1428
1429 void ext4_clear_inode(struct inode *inode)
1430 {
1431         ext4_fc_del(inode);
1432         invalidate_inode_buffers(inode);
1433         clear_inode(inode);
1434         ext4_discard_preallocations(inode, 0);
1435         ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1436         dquot_drop(inode);
1437         if (EXT4_I(inode)->jinode) {
1438                 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1439                                                EXT4_I(inode)->jinode);
1440                 jbd2_free_inode(EXT4_I(inode)->jinode);
1441                 EXT4_I(inode)->jinode = NULL;
1442         }
1443         fscrypt_put_encryption_info(inode);
1444         fsverity_cleanup_inode(inode);
1445 }
1446
1447 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1448                                         u64 ino, u32 generation)
1449 {
1450         struct inode *inode;
1451
1452         /*
1453          * Currently we don't know the generation for parent directory, so
1454          * a generation of 0 means "accept any"
1455          */
1456         inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1457         if (IS_ERR(inode))
1458                 return ERR_CAST(inode);
1459         if (generation && inode->i_generation != generation) {
1460                 iput(inode);
1461                 return ERR_PTR(-ESTALE);
1462         }
1463
1464         return inode;
1465 }
1466
1467 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1468                                         int fh_len, int fh_type)
1469 {
1470         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1471                                     ext4_nfs_get_inode);
1472 }
1473
1474 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1475                                         int fh_len, int fh_type)
1476 {
1477         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1478                                     ext4_nfs_get_inode);
1479 }
1480
1481 static int ext4_nfs_commit_metadata(struct inode *inode)
1482 {
1483         struct writeback_control wbc = {
1484                 .sync_mode = WB_SYNC_ALL
1485         };
1486
1487         trace_ext4_nfs_commit_metadata(inode);
1488         return ext4_write_inode(inode, &wbc);
1489 }
1490
1491 #ifdef CONFIG_FS_ENCRYPTION
1492 static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1493 {
1494         return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1495                                  EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1496 }
1497
1498 static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1499                                                         void *fs_data)
1500 {
1501         handle_t *handle = fs_data;
1502         int res, res2, credits, retries = 0;
1503
1504         /*
1505          * Encrypting the root directory is not allowed because e2fsck expects
1506          * lost+found to exist and be unencrypted, and encrypting the root
1507          * directory would imply encrypting the lost+found directory as well as
1508          * the filename "lost+found" itself.
1509          */
1510         if (inode->i_ino == EXT4_ROOT_INO)
1511                 return -EPERM;
1512
1513         if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1514                 return -EINVAL;
1515
1516         if (ext4_test_inode_flag(inode, EXT4_INODE_DAX))
1517                 return -EOPNOTSUPP;
1518
1519         res = ext4_convert_inline_data(inode);
1520         if (res)
1521                 return res;
1522
1523         /*
1524          * If a journal handle was specified, then the encryption context is
1525          * being set on a new inode via inheritance and is part of a larger
1526          * transaction to create the inode.  Otherwise the encryption context is
1527          * being set on an existing inode in its own transaction.  Only in the
1528          * latter case should the "retry on ENOSPC" logic be used.
1529          */
1530
1531         if (handle) {
1532                 res = ext4_xattr_set_handle(handle, inode,
1533                                             EXT4_XATTR_INDEX_ENCRYPTION,
1534                                             EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1535                                             ctx, len, 0);
1536                 if (!res) {
1537                         ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1538                         ext4_clear_inode_state(inode,
1539                                         EXT4_STATE_MAY_INLINE_DATA);
1540                         /*
1541                          * Update inode->i_flags - S_ENCRYPTED will be enabled,
1542                          * S_DAX may be disabled
1543                          */
1544                         ext4_set_inode_flags(inode, false);
1545                 }
1546                 return res;
1547         }
1548
1549         res = dquot_initialize(inode);
1550         if (res)
1551                 return res;
1552 retry:
1553         res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1554                                      &credits);
1555         if (res)
1556                 return res;
1557
1558         handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
1559         if (IS_ERR(handle))
1560                 return PTR_ERR(handle);
1561
1562         res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1563                                     EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1564                                     ctx, len, 0);
1565         if (!res) {
1566                 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1567                 /*
1568                  * Update inode->i_flags - S_ENCRYPTED will be enabled,
1569                  * S_DAX may be disabled
1570                  */
1571                 ext4_set_inode_flags(inode, false);
1572                 res = ext4_mark_inode_dirty(handle, inode);
1573                 if (res)
1574                         EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1575         }
1576         res2 = ext4_journal_stop(handle);
1577
1578         if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1579                 goto retry;
1580         if (!res)
1581                 res = res2;
1582         return res;
1583 }
1584
1585 static const union fscrypt_policy *ext4_get_dummy_policy(struct super_block *sb)
1586 {
1587         return EXT4_SB(sb)->s_dummy_enc_policy.policy;
1588 }
1589
1590 static bool ext4_has_stable_inodes(struct super_block *sb)
1591 {
1592         return ext4_has_feature_stable_inodes(sb);
1593 }
1594
1595 static void ext4_get_ino_and_lblk_bits(struct super_block *sb,
1596                                        int *ino_bits_ret, int *lblk_bits_ret)
1597 {
1598         *ino_bits_ret = 8 * sizeof(EXT4_SB(sb)->s_es->s_inodes_count);
1599         *lblk_bits_ret = 8 * sizeof(ext4_lblk_t);
1600 }
1601
1602 static const struct fscrypt_operations ext4_cryptops = {
1603         .key_prefix             = "ext4:",
1604         .get_context            = ext4_get_context,
1605         .set_context            = ext4_set_context,
1606         .get_dummy_policy       = ext4_get_dummy_policy,
1607         .empty_dir              = ext4_empty_dir,
1608         .has_stable_inodes      = ext4_has_stable_inodes,
1609         .get_ino_and_lblk_bits  = ext4_get_ino_and_lblk_bits,
1610 };
1611 #endif
1612
1613 #ifdef CONFIG_QUOTA
1614 static const char * const quotatypes[] = INITQFNAMES;
1615 #define QTYPE2NAME(t) (quotatypes[t])
1616
1617 static int ext4_write_dquot(struct dquot *dquot);
1618 static int ext4_acquire_dquot(struct dquot *dquot);
1619 static int ext4_release_dquot(struct dquot *dquot);
1620 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1621 static int ext4_write_info(struct super_block *sb, int type);
1622 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1623                          const struct path *path);
1624 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1625                                size_t len, loff_t off);
1626 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1627                                 const char *data, size_t len, loff_t off);
1628 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1629                              unsigned int flags);
1630
1631 static struct dquot **ext4_get_dquots(struct inode *inode)
1632 {
1633         return EXT4_I(inode)->i_dquot;
1634 }
1635
1636 static const struct dquot_operations ext4_quota_operations = {
1637         .get_reserved_space     = ext4_get_reserved_space,
1638         .write_dquot            = ext4_write_dquot,
1639         .acquire_dquot          = ext4_acquire_dquot,
1640         .release_dquot          = ext4_release_dquot,
1641         .mark_dirty             = ext4_mark_dquot_dirty,
1642         .write_info             = ext4_write_info,
1643         .alloc_dquot            = dquot_alloc,
1644         .destroy_dquot          = dquot_destroy,
1645         .get_projid             = ext4_get_projid,
1646         .get_inode_usage        = ext4_get_inode_usage,
1647         .get_next_id            = dquot_get_next_id,
1648 };
1649
1650 static const struct quotactl_ops ext4_qctl_operations = {
1651         .quota_on       = ext4_quota_on,
1652         .quota_off      = ext4_quota_off,
1653         .quota_sync     = dquot_quota_sync,
1654         .get_state      = dquot_get_state,
1655         .set_info       = dquot_set_dqinfo,
1656         .get_dqblk      = dquot_get_dqblk,
1657         .set_dqblk      = dquot_set_dqblk,
1658         .get_nextdqblk  = dquot_get_next_dqblk,
1659 };
1660 #endif
1661
1662 static const struct super_operations ext4_sops = {
1663         .alloc_inode    = ext4_alloc_inode,
1664         .free_inode     = ext4_free_in_core_inode,
1665         .destroy_inode  = ext4_destroy_inode,
1666         .write_inode    = ext4_write_inode,
1667         .dirty_inode    = ext4_dirty_inode,
1668         .drop_inode     = ext4_drop_inode,
1669         .evict_inode    = ext4_evict_inode,
1670         .put_super      = ext4_put_super,
1671         .sync_fs        = ext4_sync_fs,
1672         .freeze_fs      = ext4_freeze,
1673         .unfreeze_fs    = ext4_unfreeze,
1674         .statfs         = ext4_statfs,
1675         .show_options   = ext4_show_options,
1676 #ifdef CONFIG_QUOTA
1677         .quota_read     = ext4_quota_read,
1678         .quota_write    = ext4_quota_write,
1679         .get_dquots     = ext4_get_dquots,
1680 #endif
1681 };
1682
1683 static const struct export_operations ext4_export_ops = {
1684         .fh_to_dentry = ext4_fh_to_dentry,
1685         .fh_to_parent = ext4_fh_to_parent,
1686         .get_parent = ext4_get_parent,
1687         .commit_metadata = ext4_nfs_commit_metadata,
1688 };
1689
1690 enum {
1691         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1692         Opt_resgid, Opt_resuid, Opt_sb,
1693         Opt_nouid32, Opt_debug, Opt_removed,
1694         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1695         Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1696         Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1697         Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1698         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1699         Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1700         Opt_inlinecrypt,
1701         Opt_usrjquota, Opt_grpjquota, Opt_quota,
1702         Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1703         Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version,
1704         Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never,
1705         Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1706         Opt_nowarn_on_error, Opt_mblk_io_submit, Opt_debug_want_extra_isize,
1707         Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1708         Opt_inode_readahead_blks, Opt_journal_ioprio,
1709         Opt_dioread_nolock, Opt_dioread_lock,
1710         Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1711         Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
1712         Opt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan,
1713         Opt_errors, Opt_data, Opt_data_err, Opt_jqfmt, Opt_dax_type,
1714 #ifdef CONFIG_EXT4_DEBUG
1715         Opt_fc_debug_max_replay, Opt_fc_debug_force
1716 #endif
1717 };
1718
1719 static const struct constant_table ext4_param_errors[] = {
1720         {"continue",    EXT4_MOUNT_ERRORS_CONT},
1721         {"panic",       EXT4_MOUNT_ERRORS_PANIC},
1722         {"remount-ro",  EXT4_MOUNT_ERRORS_RO},
1723         {}
1724 };
1725
1726 static const struct constant_table ext4_param_data[] = {
1727         {"journal",     EXT4_MOUNT_JOURNAL_DATA},
1728         {"ordered",     EXT4_MOUNT_ORDERED_DATA},
1729         {"writeback",   EXT4_MOUNT_WRITEBACK_DATA},
1730         {}
1731 };
1732
1733 static const struct constant_table ext4_param_data_err[] = {
1734         {"abort",       Opt_data_err_abort},
1735         {"ignore",      Opt_data_err_ignore},
1736         {}
1737 };
1738
1739 static const struct constant_table ext4_param_jqfmt[] = {
1740         {"vfsold",      QFMT_VFS_OLD},
1741         {"vfsv0",       QFMT_VFS_V0},
1742         {"vfsv1",       QFMT_VFS_V1},
1743         {}
1744 };
1745
1746 static const struct constant_table ext4_param_dax[] = {
1747         {"always",      Opt_dax_always},
1748         {"inode",       Opt_dax_inode},
1749         {"never",       Opt_dax_never},
1750         {}
1751 };
1752
1753 /* String parameter that allows empty argument */
1754 #define fsparam_string_empty(NAME, OPT) \
1755         __fsparam(fs_param_is_string, NAME, OPT, fs_param_can_be_empty, NULL)
1756
1757 /*
1758  * Mount option specification
1759  * We don't use fsparam_flag_no because of the way we set the
1760  * options and the way we show them in _ext4_show_options(). To
1761  * keep the changes to a minimum, let's keep the negative options
1762  * separate for now.
1763  */
1764 static const struct fs_parameter_spec ext4_param_specs[] = {
1765         fsparam_flag    ("bsddf",               Opt_bsd_df),
1766         fsparam_flag    ("minixdf",             Opt_minix_df),
1767         fsparam_flag    ("grpid",               Opt_grpid),
1768         fsparam_flag    ("bsdgroups",           Opt_grpid),
1769         fsparam_flag    ("nogrpid",             Opt_nogrpid),
1770         fsparam_flag    ("sysvgroups",          Opt_nogrpid),
1771         fsparam_u32     ("resgid",              Opt_resgid),
1772         fsparam_u32     ("resuid",              Opt_resuid),
1773         fsparam_u32     ("sb",                  Opt_sb),
1774         fsparam_enum    ("errors",              Opt_errors, ext4_param_errors),
1775         fsparam_flag    ("nouid32",             Opt_nouid32),
1776         fsparam_flag    ("debug",               Opt_debug),
1777         fsparam_flag    ("oldalloc",            Opt_removed),
1778         fsparam_flag    ("orlov",               Opt_removed),
1779         fsparam_flag    ("user_xattr",          Opt_user_xattr),
1780         fsparam_flag    ("nouser_xattr",        Opt_nouser_xattr),
1781         fsparam_flag    ("acl",                 Opt_acl),
1782         fsparam_flag    ("noacl",               Opt_noacl),
1783         fsparam_flag    ("norecovery",          Opt_noload),
1784         fsparam_flag    ("noload",              Opt_noload),
1785         fsparam_flag    ("bh",                  Opt_removed),
1786         fsparam_flag    ("nobh",                Opt_removed),
1787         fsparam_u32     ("commit",              Opt_commit),
1788         fsparam_u32     ("min_batch_time",      Opt_min_batch_time),
1789         fsparam_u32     ("max_batch_time",      Opt_max_batch_time),
1790         fsparam_u32     ("journal_dev",         Opt_journal_dev),
1791         fsparam_bdev    ("journal_path",        Opt_journal_path),
1792         fsparam_flag    ("journal_checksum",    Opt_journal_checksum),
1793         fsparam_flag    ("nojournal_checksum",  Opt_nojournal_checksum),
1794         fsparam_flag    ("journal_async_commit",Opt_journal_async_commit),
1795         fsparam_flag    ("abort",               Opt_abort),
1796         fsparam_enum    ("data",                Opt_data, ext4_param_data),
1797         fsparam_enum    ("data_err",            Opt_data_err,
1798                                                 ext4_param_data_err),
1799         fsparam_string_empty
1800                         ("usrjquota",           Opt_usrjquota),
1801         fsparam_string_empty
1802                         ("grpjquota",           Opt_grpjquota),
1803         fsparam_enum    ("jqfmt",               Opt_jqfmt, ext4_param_jqfmt),
1804         fsparam_flag    ("grpquota",            Opt_grpquota),
1805         fsparam_flag    ("quota",               Opt_quota),
1806         fsparam_flag    ("noquota",             Opt_noquota),
1807         fsparam_flag    ("usrquota",            Opt_usrquota),
1808         fsparam_flag    ("prjquota",            Opt_prjquota),
1809         fsparam_flag    ("barrier",             Opt_barrier),
1810         fsparam_u32     ("barrier",             Opt_barrier),
1811         fsparam_flag    ("nobarrier",           Opt_nobarrier),
1812         fsparam_flag    ("i_version",           Opt_i_version),
1813         fsparam_flag    ("dax",                 Opt_dax),
1814         fsparam_enum    ("dax",                 Opt_dax_type, ext4_param_dax),
1815         fsparam_u32     ("stripe",              Opt_stripe),
1816         fsparam_flag    ("delalloc",            Opt_delalloc),
1817         fsparam_flag    ("nodelalloc",          Opt_nodelalloc),
1818         fsparam_flag    ("warn_on_error",       Opt_warn_on_error),
1819         fsparam_flag    ("nowarn_on_error",     Opt_nowarn_on_error),
1820         fsparam_u32     ("debug_want_extra_isize",
1821                                                 Opt_debug_want_extra_isize),
1822         fsparam_flag    ("mblk_io_submit",      Opt_removed),
1823         fsparam_flag    ("nomblk_io_submit",    Opt_removed),
1824         fsparam_flag    ("block_validity",      Opt_block_validity),
1825         fsparam_flag    ("noblock_validity",    Opt_noblock_validity),
1826         fsparam_u32     ("inode_readahead_blks",
1827                                                 Opt_inode_readahead_blks),
1828         fsparam_u32     ("journal_ioprio",      Opt_journal_ioprio),
1829         fsparam_u32     ("auto_da_alloc",       Opt_auto_da_alloc),
1830         fsparam_flag    ("auto_da_alloc",       Opt_auto_da_alloc),
1831         fsparam_flag    ("noauto_da_alloc",     Opt_noauto_da_alloc),
1832         fsparam_flag    ("dioread_nolock",      Opt_dioread_nolock),
1833         fsparam_flag    ("nodioread_nolock",    Opt_dioread_lock),
1834         fsparam_flag    ("dioread_lock",        Opt_dioread_lock),
1835         fsparam_flag    ("discard",             Opt_discard),
1836         fsparam_flag    ("nodiscard",           Opt_nodiscard),
1837         fsparam_u32     ("init_itable",         Opt_init_itable),
1838         fsparam_flag    ("init_itable",         Opt_init_itable),
1839         fsparam_flag    ("noinit_itable",       Opt_noinit_itable),
1840 #ifdef CONFIG_EXT4_DEBUG
1841         fsparam_flag    ("fc_debug_force",      Opt_fc_debug_force),
1842         fsparam_u32     ("fc_debug_max_replay", Opt_fc_debug_max_replay),
1843 #endif
1844         fsparam_u32     ("max_dir_size_kb",     Opt_max_dir_size_kb),
1845         fsparam_flag    ("test_dummy_encryption",
1846                                                 Opt_test_dummy_encryption),
1847         fsparam_string  ("test_dummy_encryption",
1848                                                 Opt_test_dummy_encryption),
1849         fsparam_flag    ("inlinecrypt",         Opt_inlinecrypt),
1850         fsparam_flag    ("nombcache",           Opt_nombcache),
1851         fsparam_flag    ("no_mbcache",          Opt_nombcache), /* for backward compatibility */
1852         fsparam_flag    ("prefetch_block_bitmaps",
1853                                                 Opt_removed),
1854         fsparam_flag    ("no_prefetch_block_bitmaps",
1855                                                 Opt_no_prefetch_block_bitmaps),
1856         fsparam_s32     ("mb_optimize_scan",    Opt_mb_optimize_scan),
1857         fsparam_string  ("check",               Opt_removed),   /* mount option from ext2/3 */
1858         fsparam_flag    ("nocheck",             Opt_removed),   /* mount option from ext2/3 */
1859         fsparam_flag    ("reservation",         Opt_removed),   /* mount option from ext2/3 */
1860         fsparam_flag    ("noreservation",       Opt_removed),   /* mount option from ext2/3 */
1861         fsparam_u32     ("journal",             Opt_removed),   /* mount option from ext2/3 */
1862         {}
1863 };
1864
1865 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1866 #define DEFAULT_MB_OPTIMIZE_SCAN        (-1)
1867
1868 static const char deprecated_msg[] =
1869         "Mount option \"%s\" will be removed by %s\n"
1870         "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1871
1872 #define MOPT_SET        0x0001
1873 #define MOPT_CLEAR      0x0002
1874 #define MOPT_NOSUPPORT  0x0004
1875 #define MOPT_EXPLICIT   0x0008
1876 #ifdef CONFIG_QUOTA
1877 #define MOPT_Q          0
1878 #define MOPT_QFMT       0x0010
1879 #else
1880 #define MOPT_Q          MOPT_NOSUPPORT
1881 #define MOPT_QFMT       MOPT_NOSUPPORT
1882 #endif
1883 #define MOPT_NO_EXT2    0x0020
1884 #define MOPT_NO_EXT3    0x0040
1885 #define MOPT_EXT4_ONLY  (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1886 #define MOPT_SKIP       0x0080
1887 #define MOPT_2          0x0100
1888
1889 static const struct mount_opts {
1890         int     token;
1891         int     mount_opt;
1892         int     flags;
1893 } ext4_mount_opts[] = {
1894         {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1895         {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1896         {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1897         {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1898         {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1899         {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1900         {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1901          MOPT_EXT4_ONLY | MOPT_SET},
1902         {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1903          MOPT_EXT4_ONLY | MOPT_CLEAR},
1904         {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1905         {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1906         {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1907          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1908         {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1909          MOPT_EXT4_ONLY | MOPT_CLEAR},
1910         {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1911         {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
1912         {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1913          MOPT_EXT4_ONLY | MOPT_CLEAR},
1914         {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1915          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1916         {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1917                                     EXT4_MOUNT_JOURNAL_CHECKSUM),
1918          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1919         {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1920         {Opt_data_err, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_NO_EXT2},
1921         {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1922         {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1923         {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1924         {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1925         {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1926         {Opt_dax_type, 0, MOPT_EXT4_ONLY},
1927         {Opt_journal_dev, 0, MOPT_NO_EXT2},
1928         {Opt_journal_path, 0, MOPT_NO_EXT2},
1929         {Opt_journal_ioprio, 0, MOPT_NO_EXT2},
1930         {Opt_data, 0, MOPT_NO_EXT2},
1931         {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1932         {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1933 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1934         {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1935         {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1936 #else
1937         {Opt_acl, 0, MOPT_NOSUPPORT},
1938         {Opt_noacl, 0, MOPT_NOSUPPORT},
1939 #endif
1940         {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1941         {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1942         {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1943         {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1944                                                         MOPT_SET | MOPT_Q},
1945         {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1946                                                         MOPT_SET | MOPT_Q},
1947         {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1948                                                         MOPT_SET | MOPT_Q},
1949         {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1950                        EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1951                                                         MOPT_CLEAR | MOPT_Q},
1952         {Opt_usrjquota, 0, MOPT_Q},
1953         {Opt_grpjquota, 0, MOPT_Q},
1954         {Opt_jqfmt, 0, MOPT_QFMT},
1955         {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
1956         {Opt_no_prefetch_block_bitmaps, EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS,
1957          MOPT_SET},
1958 #ifdef CONFIG_EXT4_DEBUG
1959         {Opt_fc_debug_force, EXT4_MOUNT2_JOURNAL_FAST_COMMIT,
1960          MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY},
1961 #endif
1962         {Opt_err, 0, 0}
1963 };
1964
1965 #ifdef CONFIG_UNICODE
1966 static const struct ext4_sb_encodings {
1967         __u16 magic;
1968         char *name;
1969         char *version;
1970 } ext4_sb_encoding_map[] = {
1971         {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"},
1972 };
1973
1974 static int ext4_sb_read_encoding(const struct ext4_super_block *es,
1975                                  const struct ext4_sb_encodings **encoding,
1976                                  __u16 *flags)
1977 {
1978         __u16 magic = le16_to_cpu(es->s_encoding);
1979         int i;
1980
1981         for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
1982                 if (magic == ext4_sb_encoding_map[i].magic)
1983                         break;
1984
1985         if (i >= ARRAY_SIZE(ext4_sb_encoding_map))
1986                 return -EINVAL;
1987
1988         *encoding = &ext4_sb_encoding_map[i];
1989         *flags = le16_to_cpu(es->s_encoding_flags);
1990
1991         return 0;
1992 }
1993 #endif
1994
1995 static int ext4_set_test_dummy_encryption(struct super_block *sb, char *arg)
1996 {
1997 #ifdef CONFIG_FS_ENCRYPTION
1998         struct ext4_sb_info *sbi = EXT4_SB(sb);
1999         int err;
2000
2001         err = fscrypt_set_test_dummy_encryption(sb, arg,
2002                                                 &sbi->s_dummy_enc_policy);
2003         if (err) {
2004                 ext4_msg(sb, KERN_WARNING,
2005                          "Error while setting test dummy encryption [%d]", err);
2006                 return err;
2007         }
2008         ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled");
2009 #endif
2010         return 0;
2011 }
2012
2013 #define EXT4_SPEC_JQUOTA                        (1 <<  0)
2014 #define EXT4_SPEC_JQFMT                         (1 <<  1)
2015 #define EXT4_SPEC_DATAJ                         (1 <<  2)
2016 #define EXT4_SPEC_SB_BLOCK                      (1 <<  3)
2017 #define EXT4_SPEC_JOURNAL_DEV                   (1 <<  4)
2018 #define EXT4_SPEC_JOURNAL_IOPRIO                (1 <<  5)
2019 #define EXT4_SPEC_DUMMY_ENCRYPTION              (1 <<  6)
2020 #define EXT4_SPEC_s_want_extra_isize            (1 <<  7)
2021 #define EXT4_SPEC_s_max_batch_time              (1 <<  8)
2022 #define EXT4_SPEC_s_min_batch_time              (1 <<  9)
2023 #define EXT4_SPEC_s_inode_readahead_blks        (1 << 10)
2024 #define EXT4_SPEC_s_li_wait_mult                (1 << 11)
2025 #define EXT4_SPEC_s_max_dir_size_kb             (1 << 12)
2026 #define EXT4_SPEC_s_stripe                      (1 << 13)
2027 #define EXT4_SPEC_s_resuid                      (1 << 14)
2028 #define EXT4_SPEC_s_resgid                      (1 << 15)
2029 #define EXT4_SPEC_s_commit_interval             (1 << 16)
2030 #define EXT4_SPEC_s_fc_debug_max_replay         (1 << 17)
2031 #define EXT4_SPEC_s_sb_block                    (1 << 18)
2032
2033 struct ext4_fs_context {
2034         char            *s_qf_names[EXT4_MAXQUOTAS];
2035         char            *test_dummy_enc_arg;
2036         int             s_jquota_fmt;   /* Format of quota to use */
2037         int             mb_optimize_scan;
2038 #ifdef CONFIG_EXT4_DEBUG
2039         int s_fc_debug_max_replay;
2040 #endif
2041         unsigned short  qname_spec;
2042         unsigned long   vals_s_flags;   /* Bits to set in s_flags */
2043         unsigned long   mask_s_flags;   /* Bits changed in s_flags */
2044         unsigned long   journal_devnum;
2045         unsigned long   s_commit_interval;
2046         unsigned long   s_stripe;
2047         unsigned int    s_inode_readahead_blks;
2048         unsigned int    s_want_extra_isize;
2049         unsigned int    s_li_wait_mult;
2050         unsigned int    s_max_dir_size_kb;
2051         unsigned int    journal_ioprio;
2052         unsigned int    vals_s_mount_opt;
2053         unsigned int    mask_s_mount_opt;
2054         unsigned int    vals_s_mount_opt2;
2055         unsigned int    mask_s_mount_opt2;
2056         unsigned int    vals_s_mount_flags;
2057         unsigned int    mask_s_mount_flags;
2058         unsigned int    opt_flags;      /* MOPT flags */
2059         unsigned int    spec;
2060         u32             s_max_batch_time;
2061         u32             s_min_batch_time;
2062         kuid_t          s_resuid;
2063         kgid_t          s_resgid;
2064         ext4_fsblk_t    s_sb_block;
2065 };
2066
2067 static void ext4_fc_free(struct fs_context *fc)
2068 {
2069         struct ext4_fs_context *ctx = fc->fs_private;
2070         int i;
2071
2072         if (!ctx)
2073                 return;
2074
2075         for (i = 0; i < EXT4_MAXQUOTAS; i++)
2076                 kfree(ctx->s_qf_names[i]);
2077
2078         kfree(ctx->test_dummy_enc_arg);
2079         kfree(ctx);
2080 }
2081
2082 int ext4_init_fs_context(struct fs_context *fc)
2083 {
2084         struct xfs_fs_context   *ctx;
2085
2086         ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL);
2087         if (!ctx)
2088                 return -ENOMEM;
2089
2090         fc->fs_private = ctx;
2091         fc->ops = &ext4_context_ops;
2092
2093         return 0;
2094 }
2095
2096 #ifdef CONFIG_QUOTA
2097 /*
2098  * Note the name of the specified quota file.
2099  */
2100 static int note_qf_name(struct fs_context *fc, int qtype,
2101                        struct fs_parameter *param)
2102 {
2103         struct ext4_fs_context *ctx = fc->fs_private;
2104         char *qname;
2105
2106         if (param->size < 1) {
2107                 ext4_msg(NULL, KERN_ERR, "Missing quota name");
2108                 return -EINVAL;
2109         }
2110         if (strchr(param->string, '/')) {
2111                 ext4_msg(NULL, KERN_ERR,
2112                          "quotafile must be on filesystem root");
2113                 return -EINVAL;
2114         }
2115         if (ctx->s_qf_names[qtype]) {
2116                 if (strcmp(ctx->s_qf_names[qtype], param->string) != 0) {
2117                         ext4_msg(NULL, KERN_ERR,
2118                                  "%s quota file already specified",
2119                                  QTYPE2NAME(qtype));
2120                         return -EINVAL;
2121                 }
2122                 return 0;
2123         }
2124
2125         qname = kmemdup_nul(param->string, param->size, GFP_KERNEL);
2126         if (!qname) {
2127                 ext4_msg(NULL, KERN_ERR,
2128                          "Not enough memory for storing quotafile name");
2129                 return -ENOMEM;
2130         }
2131         ctx->s_qf_names[qtype] = qname;
2132         ctx->qname_spec |= 1 << qtype;
2133         ctx->spec |= EXT4_SPEC_JQUOTA;
2134         return 0;
2135 }
2136
2137 /*
2138  * Clear the name of the specified quota file.
2139  */
2140 static int unnote_qf_name(struct fs_context *fc, int qtype)
2141 {
2142         struct ext4_fs_context *ctx = fc->fs_private;
2143
2144         if (ctx->s_qf_names[qtype])
2145                 kfree(ctx->s_qf_names[qtype]);
2146
2147         ctx->s_qf_names[qtype] = NULL;
2148         ctx->qname_spec |= 1 << qtype;
2149         ctx->spec |= EXT4_SPEC_JQUOTA;
2150         return 0;
2151 }
2152 #endif
2153
2154 #define EXT4_SET_CTX(name)                                              \
2155 static inline void ctx_set_##name(struct ext4_fs_context *ctx,          \
2156                                   unsigned long flag)                   \
2157 {                                                                       \
2158         ctx->mask_s_##name |= flag;                                     \
2159         ctx->vals_s_##name |= flag;                                     \
2160 }                                                                       \
2161 static inline void ctx_clear_##name(struct ext4_fs_context *ctx,        \
2162                                     unsigned long flag)                 \
2163 {                                                                       \
2164         ctx->mask_s_##name |= flag;                                     \
2165         ctx->vals_s_##name &= ~flag;                                    \
2166 }                                                                       \
2167 static inline unsigned long                                             \
2168 ctx_test_##name(struct ext4_fs_context *ctx, unsigned long flag)        \
2169 {                                                                       \
2170         return (ctx->vals_s_##name & flag);                             \
2171 }                                                                       \
2172
2173 EXT4_SET_CTX(flags);
2174 EXT4_SET_CTX(mount_opt);
2175 EXT4_SET_CTX(mount_opt2);
2176 EXT4_SET_CTX(mount_flags);
2177
2178 static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
2179 {
2180         struct ext4_fs_context *ctx = fc->fs_private;
2181         struct fs_parse_result result;
2182         const struct mount_opts *m;
2183         int is_remount;
2184         kuid_t uid;
2185         kgid_t gid;
2186         int token;
2187
2188         token = fs_parse(fc, ext4_param_specs, param, &result);
2189         if (token < 0)
2190                 return token;
2191         is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE;
2192
2193         for (m = ext4_mount_opts; m->token != Opt_err; m++)
2194                 if (token == m->token)
2195                         break;
2196
2197         ctx->opt_flags |= m->flags;
2198
2199         if (m->flags & MOPT_EXPLICIT) {
2200                 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
2201                         ctx_set_mount_opt2(ctx, EXT4_MOUNT2_EXPLICIT_DELALLOC);
2202                 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
2203                         ctx_set_mount_opt2(ctx,
2204                                        EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM);
2205                 } else
2206                         return -EINVAL;
2207         }
2208
2209         if (m->flags & MOPT_NOSUPPORT) {
2210                 ext4_msg(NULL, KERN_ERR, "%s option not supported",
2211                          param->key);
2212                 return 0;
2213         }
2214
2215         switch (token) {
2216 #ifdef CONFIG_QUOTA
2217         case Opt_usrjquota:
2218                 if (!*param->string)
2219                         return unnote_qf_name(fc, USRQUOTA);
2220                 else
2221                         return note_qf_name(fc, USRQUOTA, param);
2222         case Opt_grpjquota:
2223                 if (!*param->string)
2224                         return unnote_qf_name(fc, GRPQUOTA);
2225                 else
2226                         return note_qf_name(fc, GRPQUOTA, param);
2227 #endif
2228         case Opt_noacl:
2229         case Opt_nouser_xattr:
2230                 ext4_msg(NULL, KERN_WARNING, deprecated_msg, param->key, "3.5");
2231                 break;
2232         case Opt_sb:
2233                 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
2234                         ext4_msg(NULL, KERN_WARNING,
2235                                  "Ignoring %s option on remount", param->key);
2236                 } else {
2237                         ctx->s_sb_block = result.uint_32;
2238                         ctx->spec |= EXT4_SPEC_s_sb_block;
2239                 }
2240                 return 0;
2241         case Opt_removed:
2242                 ext4_msg(NULL, KERN_WARNING, "Ignoring removed %s option",
2243                          param->key);
2244                 return 0;
2245         case Opt_abort:
2246                 ctx_set_mount_flags(ctx, EXT4_MF_FS_ABORTED);
2247                 return 0;
2248         case Opt_i_version:
2249                 ext4_msg(NULL, KERN_WARNING, deprecated_msg, param->key, "5.20");
2250                 ext4_msg(NULL, KERN_WARNING, "Use iversion instead\n");
2251                 ctx_set_flags(ctx, SB_I_VERSION);
2252                 return 0;
2253         case Opt_inlinecrypt:
2254 #ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT
2255                 ctx_set_flags(ctx, SB_INLINECRYPT);
2256 #else
2257                 ext4_msg(NULL, KERN_ERR, "inline encryption not supported");
2258 #endif
2259                 return 0;
2260         case Opt_errors:
2261                 ctx_clear_mount_opt(ctx, EXT4_MOUNT_ERRORS_MASK);
2262                 ctx_set_mount_opt(ctx, result.uint_32);
2263                 return 0;
2264 #ifdef CONFIG_QUOTA
2265         case Opt_jqfmt:
2266                 ctx->s_jquota_fmt = result.uint_32;
2267                 ctx->spec |= EXT4_SPEC_JQFMT;
2268                 return 0;
2269 #endif
2270         case Opt_data:
2271                 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS);
2272                 ctx_set_mount_opt(ctx, result.uint_32);
2273                 ctx->spec |= EXT4_SPEC_DATAJ;
2274                 return 0;
2275         case Opt_commit:
2276                 if (result.uint_32 == 0)
2277                         ctx->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE;
2278                 else if (result.uint_32 > INT_MAX / HZ) {
2279                         ext4_msg(NULL, KERN_ERR,
2280                                  "Invalid commit interval %d, "
2281                                  "must be smaller than %d",
2282                                  result.uint_32, INT_MAX / HZ);
2283                         return -EINVAL;
2284                 }
2285                 ctx->s_commit_interval = HZ * result.uint_32;
2286                 ctx->spec |= EXT4_SPEC_s_commit_interval;
2287                 return 0;
2288         case Opt_debug_want_extra_isize:
2289                 if ((result.uint_32 & 1) || (result.uint_32 < 4)) {
2290                         ext4_msg(NULL, KERN_ERR,
2291                                  "Invalid want_extra_isize %d", result.uint_32);
2292                         return -EINVAL;
2293                 }
2294                 ctx->s_want_extra_isize = result.uint_32;
2295                 ctx->spec |= EXT4_SPEC_s_want_extra_isize;
2296                 return 0;
2297         case Opt_max_batch_time:
2298                 ctx->s_max_batch_time = result.uint_32;
2299                 ctx->spec |= EXT4_SPEC_s_max_batch_time;
2300                 return 0;
2301         case Opt_min_batch_time:
2302                 ctx->s_min_batch_time = result.uint_32;
2303                 ctx->spec |= EXT4_SPEC_s_min_batch_time;
2304                 return 0;
2305         case Opt_inode_readahead_blks:
2306                 if (result.uint_32 &&
2307                     (result.uint_32 > (1 << 30) ||
2308                      !is_power_of_2(result.uint_32))) {
2309                         ext4_msg(NULL, KERN_ERR,
2310                                  "EXT4-fs: inode_readahead_blks must be "
2311                                  "0 or a power of 2 smaller than 2^31");
2312                         return -EINVAL;
2313                 }
2314                 ctx->s_inode_readahead_blks = result.uint_32;
2315                 ctx->spec |= EXT4_SPEC_s_inode_readahead_blks;
2316                 return 0;
2317         case Opt_init_itable:
2318                 ctx_set_mount_opt(ctx, EXT4_MOUNT_INIT_INODE_TABLE);
2319                 ctx->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
2320                 if (param->type == fs_value_is_string)
2321                         ctx->s_li_wait_mult = result.uint_32;
2322                 ctx->spec |= EXT4_SPEC_s_li_wait_mult;
2323                 return 0;
2324         case Opt_max_dir_size_kb:
2325                 ctx->s_max_dir_size_kb = result.uint_32;
2326                 ctx->spec |= EXT4_SPEC_s_max_dir_size_kb;
2327                 return 0;
2328 #ifdef CONFIG_EXT4_DEBUG
2329         case Opt_fc_debug_max_replay:
2330                 ctx->s_fc_debug_max_replay = result.uint_32;
2331                 ctx->spec |= EXT4_SPEC_s_fc_debug_max_replay;
2332                 return 0;
2333 #endif
2334         case Opt_stripe:
2335                 ctx->s_stripe = result.uint_32;
2336                 ctx->spec |= EXT4_SPEC_s_stripe;
2337                 return 0;
2338         case Opt_resuid:
2339                 uid = make_kuid(current_user_ns(), result.uint_32);
2340                 if (!uid_valid(uid)) {
2341                         ext4_msg(NULL, KERN_ERR, "Invalid uid value %d",
2342                                  result.uint_32);
2343                         return -EINVAL;
2344                 }
2345                 ctx->s_resuid = uid;
2346                 ctx->spec |= EXT4_SPEC_s_resuid;
2347                 return 0;
2348         case Opt_resgid:
2349                 gid = make_kgid(current_user_ns(), result.uint_32);
2350                 if (!gid_valid(gid)) {
2351                         ext4_msg(NULL, KERN_ERR, "Invalid gid value %d",
2352                                  result.uint_32);
2353                         return -EINVAL;
2354                 }
2355                 ctx->s_resgid = gid;
2356                 ctx->spec |= EXT4_SPEC_s_resgid;
2357                 return 0;
2358         case Opt_journal_dev:
2359                 if (is_remount) {
2360                         ext4_msg(NULL, KERN_ERR,
2361                                  "Cannot specify journal on remount");
2362                         return -EINVAL;
2363                 }
2364                 ctx->journal_devnum = result.uint_32;
2365                 ctx->spec |= EXT4_SPEC_JOURNAL_DEV;
2366                 return 0;
2367         case Opt_journal_path:
2368         {
2369                 struct inode *journal_inode;
2370                 struct path path;
2371                 int error;
2372
2373                 if (is_remount) {
2374                         ext4_msg(NULL, KERN_ERR,
2375                                  "Cannot specify journal on remount");
2376                         return -EINVAL;
2377                 }
2378
2379                 error = fs_lookup_param(fc, param, 1, &path);
2380                 if (error) {
2381                         ext4_msg(NULL, KERN_ERR, "error: could not find "
2382                                  "journal device path");
2383                         return -EINVAL;
2384                 }
2385
2386                 journal_inode = d_inode(path.dentry);
2387                 ctx->journal_devnum = new_encode_dev(journal_inode->i_rdev);
2388                 ctx->spec |= EXT4_SPEC_JOURNAL_DEV;
2389                 path_put(&path);
2390                 return 0;
2391         }
2392         case Opt_journal_ioprio:
2393                 if (result.uint_32 > 7) {
2394                         ext4_msg(NULL, KERN_ERR, "Invalid journal IO priority"
2395                                  " (must be 0-7)");
2396                         return -EINVAL;
2397                 }
2398                 ctx->journal_ioprio =
2399                         IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, result.uint_32);
2400                 ctx->spec |= EXT4_SPEC_JOURNAL_IOPRIO;
2401                 return 0;
2402         case Opt_test_dummy_encryption:
2403 #ifdef CONFIG_FS_ENCRYPTION
2404                 if (param->type == fs_value_is_flag) {
2405                         ctx->spec |= EXT4_SPEC_DUMMY_ENCRYPTION;
2406                         ctx->test_dummy_enc_arg = NULL;
2407                         return 0;
2408                 }
2409                 if (*param->string &&
2410                     !(!strcmp(param->string, "v1") ||
2411                       !strcmp(param->string, "v2"))) {
2412                         ext4_msg(NULL, KERN_WARNING,
2413                                  "Value of option \"%s\" is unrecognized",
2414                                  param->key);
2415                         return -EINVAL;
2416                 }
2417                 ctx->spec |= EXT4_SPEC_DUMMY_ENCRYPTION;
2418                 ctx->test_dummy_enc_arg = kmemdup_nul(param->string, param->size,
2419                                                       GFP_KERNEL);
2420 #else
2421                 ext4_msg(NULL, KERN_WARNING,
2422                          "Test dummy encryption mount option ignored");
2423 #endif
2424                 return 0;
2425         case Opt_dax:
2426         case Opt_dax_type:
2427 #ifdef CONFIG_FS_DAX
2428         {
2429                 int type = (token == Opt_dax) ?
2430                            Opt_dax : result.uint_32;
2431
2432                 switch (type) {
2433                 case Opt_dax:
2434                 case Opt_dax_always:
2435                         ctx_set_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
2436                         ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
2437                         break;
2438                 case Opt_dax_never:
2439                         ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
2440                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
2441                         break;
2442                 case Opt_dax_inode:
2443                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
2444                         ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
2445                         /* Strictly for printing options */
2446                         ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE);
2447                         break;
2448                 }
2449                 return 0;
2450         }
2451 #else
2452                 ext4_msg(NULL, KERN_INFO, "dax option not supported");
2453                 return -EINVAL;
2454 #endif
2455         case Opt_data_err:
2456                 if (result.uint_32 == Opt_data_err_abort)
2457                         ctx_set_mount_opt(ctx, m->mount_opt);
2458                 else if (result.uint_32 == Opt_data_err_ignore)
2459                         ctx_clear_mount_opt(ctx, m->mount_opt);
2460                 return 0;
2461         case Opt_mb_optimize_scan:
2462                 if (result.int_32 != 0 && result.int_32 != 1) {
2463                         ext4_msg(NULL, KERN_WARNING,
2464                                  "mb_optimize_scan should be set to 0 or 1.");
2465                         return -EINVAL;
2466                 }
2467                 ctx->mb_optimize_scan = result.int_32;
2468                 return 0;
2469         }
2470
2471         /*
2472          * At this point we should only be getting options requiring MOPT_SET,
2473          * or MOPT_CLEAR. Anything else is a bug
2474          */
2475         if (m->token == Opt_err) {
2476                 ext4_msg(NULL, KERN_WARNING, "buggy handling of option %s",
2477                          param->key);
2478                 WARN_ON(1);
2479                 return -EINVAL;
2480         }
2481
2482         else {
2483                 unsigned int set = 0;
2484
2485                 if ((param->type == fs_value_is_flag) ||
2486                     result.uint_32 > 0)
2487                         set = 1;
2488
2489                 if (m->flags & MOPT_CLEAR)
2490                         set = !set;
2491                 else if (unlikely(!(m->flags & MOPT_SET))) {
2492                         ext4_msg(NULL, KERN_WARNING,
2493                                  "buggy handling of option %s",
2494                                  param->key);
2495                         WARN_ON(1);
2496                         return -EINVAL;
2497                 }
2498                 if (m->flags & MOPT_2) {
2499                         if (set != 0)
2500                                 ctx_set_mount_opt2(ctx, m->mount_opt);
2501                         else
2502                                 ctx_clear_mount_opt2(ctx, m->mount_opt);
2503                 } else {
2504                         if (set != 0)
2505                                 ctx_set_mount_opt(ctx, m->mount_opt);
2506                         else
2507                                 ctx_clear_mount_opt(ctx, m->mount_opt);
2508                 }
2509         }
2510
2511         return 0;
2512 }
2513
2514 static int parse_options(struct fs_context *fc, char *options)
2515 {
2516         struct fs_parameter param;
2517         int ret;
2518         char *key;
2519
2520         if (!options)
2521                 return 0;
2522
2523         while ((key = strsep(&options, ",")) != NULL) {
2524                 if (*key) {
2525                         size_t v_len = 0;
2526                         char *value = strchr(key, '=');
2527
2528                         param.type = fs_value_is_flag;
2529                         param.string = NULL;
2530
2531                         if (value) {
2532                                 if (value == key)
2533                                         continue;
2534
2535                                 *value++ = 0;
2536                                 v_len = strlen(value);
2537                                 param.string = kmemdup_nul(value, v_len,
2538                                                            GFP_KERNEL);
2539                                 if (!param.string)
2540                                         return -ENOMEM;
2541                                 param.type = fs_value_is_string;
2542                         }
2543
2544                         param.key = key;
2545                         param.size = v_len;
2546
2547                         ret = ext4_parse_param(fc, &param);
2548                         if (param.string)
2549                                 kfree(param.string);
2550                         if (ret < 0)
2551                                 return ret;
2552                 }
2553         }
2554
2555         ret = ext4_validate_options(fc);
2556         if (ret < 0)
2557                 return ret;
2558
2559         return 0;
2560 }
2561
2562 static int parse_apply_sb_mount_options(struct super_block *sb,
2563                                         struct ext4_fs_context *m_ctx)
2564 {
2565         struct ext4_sb_info *sbi = EXT4_SB(sb);
2566         char *s_mount_opts = NULL;
2567         struct ext4_fs_context *s_ctx = NULL;
2568         struct fs_context *fc = NULL;
2569         int ret = -ENOMEM;
2570
2571         if (!sbi->s_es->s_mount_opts[0])
2572                 return 0;
2573
2574         s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
2575                                 sizeof(sbi->s_es->s_mount_opts),
2576                                 GFP_KERNEL);
2577         if (!s_mount_opts)
2578                 return ret;
2579
2580         fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL);
2581         if (!fc)
2582                 goto out_free;
2583
2584         s_ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL);
2585         if (!s_ctx)
2586                 goto out_free;
2587
2588         fc->fs_private = s_ctx;
2589         fc->s_fs_info = sbi;
2590
2591         ret = parse_options(fc, s_mount_opts);
2592         if (ret < 0)
2593                 goto parse_failed;
2594
2595         ret = ext4_check_opt_consistency(fc, sb);
2596         if (ret < 0) {
2597 parse_failed:
2598                 ext4_msg(sb, KERN_WARNING,
2599                          "failed to parse options in superblock: %s",
2600                          s_mount_opts);
2601                 ret = 0;
2602                 goto out_free;
2603         }
2604
2605         if (s_ctx->spec & EXT4_SPEC_JOURNAL_DEV)
2606                 m_ctx->journal_devnum = s_ctx->journal_devnum;
2607         if (s_ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)
2608                 m_ctx->journal_ioprio = s_ctx->journal_ioprio;
2609
2610         ret = ext4_apply_options(fc, sb);
2611
2612 out_free:
2613         kfree(s_ctx);
2614         kfree(fc);
2615         kfree(s_mount_opts);
2616         return ret;
2617 }
2618
2619 static void ext4_apply_quota_options(struct fs_context *fc,
2620                                      struct super_block *sb)
2621 {
2622 #ifdef CONFIG_QUOTA
2623         bool quota_feature = ext4_has_feature_quota(sb);
2624         struct ext4_fs_context *ctx = fc->fs_private;
2625         struct ext4_sb_info *sbi = EXT4_SB(sb);
2626         char *qname;
2627         int i;
2628
2629         if (quota_feature)
2630                 return;
2631
2632         if (ctx->spec & EXT4_SPEC_JQUOTA) {
2633                 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2634                         if (!(ctx->qname_spec & (1 << i)))
2635                                 continue;
2636
2637                         qname = ctx->s_qf_names[i]; /* May be NULL */
2638                         ctx->s_qf_names[i] = NULL;
2639                         kfree(sbi->s_qf_names[i]);
2640                         rcu_assign_pointer(sbi->s_qf_names[i], qname);
2641                         set_opt(sb, QUOTA);
2642                 }
2643         }
2644
2645         if (ctx->spec & EXT4_SPEC_JQFMT)
2646                 sbi->s_jquota_fmt = ctx->s_jquota_fmt;
2647 #endif
2648 }
2649
2650 /*
2651  * Check quota settings consistency.
2652  */
2653 static int ext4_check_quota_consistency(struct fs_context *fc,
2654                                         struct super_block *sb)
2655 {
2656 #ifdef CONFIG_QUOTA
2657         struct ext4_fs_context *ctx = fc->fs_private;
2658         struct ext4_sb_info *sbi = EXT4_SB(sb);
2659         bool quota_feature = ext4_has_feature_quota(sb);
2660         bool quota_loaded = sb_any_quota_loaded(sb);
2661         bool usr_qf_name, grp_qf_name, usrquota, grpquota;
2662         int quota_flags, i;
2663
2664         /*
2665          * We do the test below only for project quotas. 'usrquota' and
2666          * 'grpquota' mount options are allowed even without quota feature
2667          * to support legacy quotas in quota files.
2668          */
2669         if (ctx_test_mount_opt(ctx, EXT4_MOUNT_PRJQUOTA) &&
2670             !ext4_has_feature_project(sb)) {
2671                 ext4_msg(NULL, KERN_ERR, "Project quota feature not enabled. "
2672                          "Cannot enable project quota enforcement.");
2673                 return -EINVAL;
2674         }
2675
2676         quota_flags = EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
2677                       EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA;
2678         if (quota_loaded &&
2679             ctx->mask_s_mount_opt & quota_flags &&
2680             !ctx_test_mount_opt(ctx, quota_flags))
2681                 goto err_quota_change;
2682
2683         if (ctx->spec & EXT4_SPEC_JQUOTA) {
2684
2685                 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2686                         if (!(ctx->qname_spec & (1 << i)))
2687                                 continue;
2688
2689                         if (quota_loaded &&
2690                             !!sbi->s_qf_names[i] != !!ctx->s_qf_names[i])
2691                                 goto err_jquota_change;
2692
2693                         if (sbi->s_qf_names[i] && ctx->s_qf_names[i] &&
2694                             strcmp(sbi->s_qf_names[i],
2695                                    ctx->s_qf_names[i]) != 0)
2696                                 goto err_jquota_specified;
2697                 }
2698
2699                 if (quota_feature) {
2700                         ext4_msg(NULL, KERN_INFO,
2701                                  "Journaled quota options ignored when "
2702                                  "QUOTA feature is enabled");
2703                         return 0;
2704                 }
2705         }
2706
2707         if (ctx->spec & EXT4_SPEC_JQFMT) {
2708                 if (sbi->s_jquota_fmt != ctx->s_jquota_fmt && quota_loaded)
2709                         goto err_jquota_change;
2710                 if (quota_feature) {
2711                         ext4_msg(NULL, KERN_INFO, "Quota format mount options "
2712                                  "ignored when QUOTA feature is enabled");
2713                         return 0;
2714                 }
2715         }
2716
2717         /* Make sure we don't mix old and new quota format */
2718         usr_qf_name = (get_qf_name(sb, sbi, USRQUOTA) ||
2719                        ctx->s_qf_names[USRQUOTA]);
2720         grp_qf_name = (get_qf_name(sb, sbi, GRPQUOTA) ||
2721                        ctx->s_qf_names[GRPQUOTA]);
2722
2723         usrquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) ||
2724                     test_opt(sb, USRQUOTA));
2725
2726         grpquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) ||
2727                     test_opt(sb, GRPQUOTA));
2728
2729         if (usr_qf_name) {
2730                 ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA);
2731                 usrquota = false;
2732         }
2733         if (grp_qf_name) {
2734                 ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA);
2735                 grpquota = false;
2736         }
2737
2738         if (usr_qf_name || grp_qf_name) {
2739                 if (usrquota || grpquota) {
2740                         ext4_msg(NULL, KERN_ERR, "old and new quota "
2741                                  "format mixing");
2742                         return -EINVAL;
2743                 }
2744
2745                 if (!(ctx->spec & EXT4_SPEC_JQFMT || sbi->s_jquota_fmt)) {
2746                         ext4_msg(NULL, KERN_ERR, "journaled quota format "
2747                                  "not specified");
2748                         return -EINVAL;
2749                 }
2750         }
2751
2752         return 0;
2753
2754 err_quota_change:
2755         ext4_msg(NULL, KERN_ERR,
2756                  "Cannot change quota options when quota turned on");
2757         return -EINVAL;
2758 err_jquota_change:
2759         ext4_msg(NULL, KERN_ERR, "Cannot change journaled quota "
2760                  "options when quota turned on");
2761         return -EINVAL;
2762 err_jquota_specified:
2763         ext4_msg(NULL, KERN_ERR, "%s quota file already specified",
2764                  QTYPE2NAME(i));
2765         return -EINVAL;
2766 #else
2767         return 0;
2768 #endif
2769 }
2770
2771 static int ext4_check_opt_consistency(struct fs_context *fc,
2772                                       struct super_block *sb)
2773 {
2774         struct ext4_fs_context *ctx = fc->fs_private;
2775         struct ext4_sb_info *sbi = fc->s_fs_info;
2776         int is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE;
2777
2778         if ((ctx->opt_flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
2779                 ext4_msg(NULL, KERN_ERR,
2780                          "Mount option(s) incompatible with ext2");
2781                 return -EINVAL;
2782         }
2783         if ((ctx->opt_flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
2784                 ext4_msg(NULL, KERN_ERR,
2785                          "Mount option(s) incompatible with ext3");
2786                 return -EINVAL;
2787         }
2788
2789         if (ctx->s_want_extra_isize >
2790             (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE)) {
2791                 ext4_msg(NULL, KERN_ERR,
2792                          "Invalid want_extra_isize %d",
2793                          ctx->s_want_extra_isize);
2794                 return -EINVAL;
2795         }
2796
2797         if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DIOREAD_NOLOCK)) {
2798                 int blocksize =
2799                         BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2800                 if (blocksize < PAGE_SIZE)
2801                         ext4_msg(NULL, KERN_WARNING, "Warning: mounting with an "
2802                                  "experimental mount option 'dioread_nolock' "
2803                                  "for blocksize < PAGE_SIZE");
2804         }
2805
2806 #ifdef CONFIG_FS_ENCRYPTION
2807         /*
2808          * This mount option is just for testing, and it's not worthwhile to
2809          * implement the extra complexity (e.g. RCU protection) that would be
2810          * needed to allow it to be set or changed during remount.  We do allow
2811          * it to be specified during remount, but only if there is no change.
2812          */
2813         if ((ctx->spec & EXT4_SPEC_DUMMY_ENCRYPTION) &&
2814             is_remount && !sbi->s_dummy_enc_policy.policy) {
2815                 ext4_msg(NULL, KERN_WARNING,
2816                          "Can't set test_dummy_encryption on remount");
2817                 return -1;
2818         }
2819 #endif
2820
2821         if ((ctx->spec & EXT4_SPEC_DATAJ) && is_remount) {
2822                 if (!sbi->s_journal) {
2823                         ext4_msg(NULL, KERN_WARNING,
2824                                  "Remounting file system with no journal "
2825                                  "so ignoring journalled data option");
2826                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS);
2827                 } else if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS) !=
2828                            test_opt(sb, DATA_FLAGS)) {
2829                         ext4_msg(NULL, KERN_ERR, "Cannot change data mode "
2830                                  "on remount");
2831                         return -EINVAL;
2832                 }
2833         }
2834
2835         if (is_remount) {
2836                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) &&
2837                     (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
2838                         ext4_msg(NULL, KERN_ERR, "can't mount with "
2839                                  "both data=journal and dax");
2840                         return -EINVAL;
2841                 }
2842
2843                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) &&
2844                     (!(sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2845                      (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER))) {
2846 fail_dax_change_remount:
2847                         ext4_msg(NULL, KERN_ERR, "can't change "
2848                                  "dax mount option while remounting");
2849                         return -EINVAL;
2850                 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER) &&
2851                          (!(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2852                           (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS))) {
2853                         goto fail_dax_change_remount;
2854                 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE) &&
2855                            ((sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2856                             (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2857                             !(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_INODE))) {
2858                         goto fail_dax_change_remount;
2859                 }
2860         }
2861
2862         return ext4_check_quota_consistency(fc, sb);
2863 }
2864
2865 static int ext4_apply_options(struct fs_context *fc, struct super_block *sb)
2866 {
2867         struct ext4_fs_context *ctx = fc->fs_private;
2868         struct ext4_sb_info *sbi = fc->s_fs_info;
2869         int ret = 0;
2870
2871         sbi->s_mount_opt &= ~ctx->mask_s_mount_opt;
2872         sbi->s_mount_opt |= ctx->vals_s_mount_opt;
2873         sbi->s_mount_opt2 &= ~ctx->mask_s_mount_opt2;
2874         sbi->s_mount_opt2 |= ctx->vals_s_mount_opt2;
2875         sbi->s_mount_flags &= ~ctx->mask_s_mount_flags;
2876         sbi->s_mount_flags |= ctx->vals_s_mount_flags;
2877         sb->s_flags &= ~ctx->mask_s_flags;
2878         sb->s_flags |= ctx->vals_s_flags;
2879
2880         /*
2881          * i_version differs from common mount option iversion so we have
2882          * to let vfs know that it was set, otherwise it would get cleared
2883          * on remount
2884          */
2885         if (ctx->mask_s_flags & SB_I_VERSION)
2886                 fc->sb_flags |= SB_I_VERSION;
2887
2888 #define APPLY(X) ({ if (ctx->spec & EXT4_SPEC_##X) sbi->X = ctx->X; })
2889         APPLY(s_commit_interval);
2890         APPLY(s_stripe);
2891         APPLY(s_max_batch_time);
2892         APPLY(s_min_batch_time);
2893         APPLY(s_want_extra_isize);
2894         APPLY(s_inode_readahead_blks);
2895         APPLY(s_max_dir_size_kb);
2896         APPLY(s_li_wait_mult);
2897         APPLY(s_resgid);
2898         APPLY(s_resuid);
2899
2900 #ifdef CONFIG_EXT4_DEBUG
2901         APPLY(s_fc_debug_max_replay);
2902 #endif
2903
2904         ext4_apply_quota_options(fc, sb);
2905
2906         if (ctx->spec & EXT4_SPEC_DUMMY_ENCRYPTION)
2907                 ret = ext4_set_test_dummy_encryption(sb, ctx->test_dummy_enc_arg);
2908
2909         return ret;
2910 }
2911
2912
2913 static int ext4_validate_options(struct fs_context *fc)
2914 {
2915 #ifdef CONFIG_QUOTA
2916         struct ext4_fs_context *ctx = fc->fs_private;
2917         char *usr_qf_name, *grp_qf_name;
2918
2919         usr_qf_name = ctx->s_qf_names[USRQUOTA];
2920         grp_qf_name = ctx->s_qf_names[GRPQUOTA];
2921
2922         if (usr_qf_name || grp_qf_name) {
2923                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) && usr_qf_name)
2924                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA);
2925
2926                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) && grp_qf_name)
2927                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA);
2928
2929                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) ||
2930                     ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA)) {
2931                         ext4_msg(NULL, KERN_ERR, "old and new quota "
2932                                  "format mixing");
2933                         return -EINVAL;
2934                 }
2935         }
2936 #endif
2937         return 1;
2938 }
2939
2940 static inline void ext4_show_quota_options(struct seq_file *seq,
2941                                            struct super_block *sb)
2942 {
2943 #if defined(CONFIG_QUOTA)
2944         struct ext4_sb_info *sbi = EXT4_SB(sb);
2945         char *usr_qf_name, *grp_qf_name;
2946
2947         if (sbi->s_jquota_fmt) {
2948                 char *fmtname = "";
2949
2950                 switch (sbi->s_jquota_fmt) {
2951                 case QFMT_VFS_OLD:
2952                         fmtname = "vfsold";
2953                         break;
2954                 case QFMT_VFS_V0:
2955                         fmtname = "vfsv0";
2956                         break;
2957                 case QFMT_VFS_V1:
2958                         fmtname = "vfsv1";
2959                         break;
2960                 }
2961                 seq_printf(seq, ",jqfmt=%s", fmtname);
2962         }
2963
2964         rcu_read_lock();
2965         usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2966         grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2967         if (usr_qf_name)
2968                 seq_show_option(seq, "usrjquota", usr_qf_name);
2969         if (grp_qf_name)
2970                 seq_show_option(seq, "grpjquota", grp_qf_name);
2971         rcu_read_unlock();
2972 #endif
2973 }
2974
2975 static const char *token2str(int token)
2976 {
2977         const struct fs_parameter_spec *spec;
2978
2979         for (spec = ext4_param_specs; spec->name != NULL; spec++)
2980                 if (spec->opt == token && !spec->type)
2981                         break;
2982         return spec->name;
2983 }
2984
2985 /*
2986  * Show an option if
2987  *  - it's set to a non-default value OR
2988  *  - if the per-sb default is different from the global default
2989  */
2990 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2991                               int nodefs)
2992 {
2993         struct ext4_sb_info *sbi = EXT4_SB(sb);
2994         struct ext4_super_block *es = sbi->s_es;
2995         int def_errors, def_mount_opt = sbi->s_def_mount_opt;
2996         const struct mount_opts *m;
2997         char sep = nodefs ? '\n' : ',';
2998
2999 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
3000 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
3001
3002         if (sbi->s_sb_block != 1)
3003                 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
3004
3005         for (m = ext4_mount_opts; m->token != Opt_err; m++) {
3006                 int want_set = m->flags & MOPT_SET;
3007                 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
3008                     m->flags & MOPT_SKIP)
3009                         continue;
3010                 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
3011                         continue; /* skip if same as the default */
3012                 if ((want_set &&
3013                      (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
3014                     (!want_set && (sbi->s_mount_opt & m->mount_opt)))
3015                         continue; /* select Opt_noFoo vs Opt_Foo */
3016                 SEQ_OPTS_PRINT("%s", token2str(m->token));
3017         }
3018
3019         if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
3020             le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
3021                 SEQ_OPTS_PRINT("resuid=%u",
3022                                 from_kuid_munged(&init_user_ns, sbi->s_resuid));
3023         if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
3024             le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
3025                 SEQ_OPTS_PRINT("resgid=%u",
3026                                 from_kgid_munged(&init_user_ns, sbi->s_resgid));
3027         def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
3028         if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
3029                 SEQ_OPTS_PUTS("errors=remount-ro");
3030         if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
3031                 SEQ_OPTS_PUTS("errors=continue");
3032         if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
3033                 SEQ_OPTS_PUTS("errors=panic");
3034         if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
3035                 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
3036         if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
3037                 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
3038         if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
3039                 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
3040         if (sb->s_flags & SB_I_VERSION)
3041                 SEQ_OPTS_PUTS("i_version");
3042         if (nodefs || sbi->s_stripe)
3043                 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
3044         if (nodefs || EXT4_MOUNT_DATA_FLAGS &
3045                         (sbi->s_mount_opt ^ def_mount_opt)) {
3046                 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3047                         SEQ_OPTS_PUTS("data=journal");
3048                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3049                         SEQ_OPTS_PUTS("data=ordered");
3050                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
3051                         SEQ_OPTS_PUTS("data=writeback");
3052         }
3053         if (nodefs ||
3054             sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
3055                 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
3056                                sbi->s_inode_readahead_blks);
3057
3058         if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
3059                        (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
3060                 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
3061         if (nodefs || sbi->s_max_dir_size_kb)
3062                 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
3063         if (test_opt(sb, DATA_ERR_ABORT))
3064                 SEQ_OPTS_PUTS("data_err=abort");
3065
3066         fscrypt_show_test_dummy_encryption(seq, sep, sb);
3067
3068         if (sb->s_flags & SB_INLINECRYPT)
3069                 SEQ_OPTS_PUTS("inlinecrypt");
3070
3071         if (test_opt(sb, DAX_ALWAYS)) {
3072                 if (IS_EXT2_SB(sb))
3073                         SEQ_OPTS_PUTS("dax");
3074                 else
3075                         SEQ_OPTS_PUTS("dax=always");
3076         } else if (test_opt2(sb, DAX_NEVER)) {
3077                 SEQ_OPTS_PUTS("dax=never");
3078         } else if (test_opt2(sb, DAX_INODE)) {
3079                 SEQ_OPTS_PUTS("dax=inode");
3080         }
3081         ext4_show_quota_options(seq, sb);
3082         return 0;
3083 }
3084
3085 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
3086 {
3087         return _ext4_show_options(seq, root->d_sb, 0);
3088 }
3089
3090 int ext4_seq_options_show(struct seq_file *seq, void *offset)
3091 {
3092         struct super_block *sb = seq->private;
3093         int rc;
3094
3095         seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
3096         rc = _ext4_show_options(seq, sb, 1);
3097         seq_puts(seq, "\n");
3098         return rc;
3099 }
3100
3101 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
3102                             int read_only)
3103 {
3104         struct ext4_sb_info *sbi = EXT4_SB(sb);
3105         int err = 0;
3106
3107         if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
3108                 ext4_msg(sb, KERN_ERR, "revision level too high, "
3109                          "forcing read-only mode");
3110                 err = -EROFS;
3111                 goto done;
3112         }
3113         if (read_only)
3114                 goto done;
3115         if (!(sbi->s_mount_state & EXT4_VALID_FS))
3116                 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
3117                          "running e2fsck is recommended");
3118         else if (sbi->s_mount_state & EXT4_ERROR_FS)
3119                 ext4_msg(sb, KERN_WARNING,
3120                          "warning: mounting fs with errors, "
3121                          "running e2fsck is recommended");
3122         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
3123                  le16_to_cpu(es->s_mnt_count) >=
3124                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
3125                 ext4_msg(sb, KERN_WARNING,
3126                          "warning: maximal mount count reached, "
3127                          "running e2fsck is recommended");
3128         else if (le32_to_cpu(es->s_checkinterval) &&
3129                  (ext4_get_tstamp(es, s_lastcheck) +
3130                   le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
3131                 ext4_msg(sb, KERN_WARNING,
3132                          "warning: checktime reached, "
3133                          "running e2fsck is recommended");
3134         if (!sbi->s_journal)
3135                 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
3136         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
3137                 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
3138         le16_add_cpu(&es->s_mnt_count, 1);
3139         ext4_update_tstamp(es, s_mtime);
3140         if (sbi->s_journal) {
3141                 ext4_set_feature_journal_needs_recovery(sb);
3142                 if (ext4_has_feature_orphan_file(sb))
3143                         ext4_set_feature_orphan_present(sb);
3144         }
3145
3146         err = ext4_commit_super(sb);
3147 done:
3148         if (test_opt(sb, DEBUG))
3149                 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
3150                                 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
3151                         sb->s_blocksize,
3152                         sbi->s_groups_count,
3153                         EXT4_BLOCKS_PER_GROUP(sb),
3154                         EXT4_INODES_PER_GROUP(sb),
3155                         sbi->s_mount_opt, sbi->s_mount_opt2);
3156
3157         cleancache_init_fs(sb);
3158         return err;
3159 }
3160
3161 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
3162 {
3163         struct ext4_sb_info *sbi = EXT4_SB(sb);
3164         struct flex_groups **old_groups, **new_groups;
3165         int size, i, j;
3166
3167         if (!sbi->s_log_groups_per_flex)
3168                 return 0;
3169
3170         size = ext4_flex_group(sbi, ngroup - 1) + 1;
3171         if (size <= sbi->s_flex_groups_allocated)
3172                 return 0;
3173
3174         new_groups = kvzalloc(roundup_pow_of_two(size *
3175                               sizeof(*sbi->s_flex_groups)), GFP_KERNEL);
3176         if (!new_groups) {
3177                 ext4_msg(sb, KERN_ERR,
3178                          "not enough memory for %d flex group pointers", size);
3179                 return -ENOMEM;
3180         }
3181         for (i = sbi->s_flex_groups_allocated; i < size; i++) {
3182                 new_groups[i] = kvzalloc(roundup_pow_of_two(
3183                                          sizeof(struct flex_groups)),
3184                                          GFP_KERNEL);
3185                 if (!new_groups[i]) {
3186                         for (j = sbi->s_flex_groups_allocated; j < i; j++)
3187                                 kvfree(new_groups[j]);
3188                         kvfree(new_groups);
3189                         ext4_msg(sb, KERN_ERR,
3190                                  "not enough memory for %d flex groups", size);
3191                         return -ENOMEM;
3192                 }
3193         }
3194         rcu_read_lock();
3195         old_groups = rcu_dereference(sbi->s_flex_groups);
3196         if (old_groups)
3197                 memcpy(new_groups, old_groups,
3198                        (sbi->s_flex_groups_allocated *
3199                         sizeof(struct flex_groups *)));
3200         rcu_read_unlock();
3201         rcu_assign_pointer(sbi->s_flex_groups, new_groups);
3202         sbi->s_flex_groups_allocated = size;
3203         if (old_groups)
3204                 ext4_kvfree_array_rcu(old_groups);
3205         return 0;
3206 }
3207
3208 static int ext4_fill_flex_info(struct super_block *sb)
3209 {
3210         struct ext4_sb_info *sbi = EXT4_SB(sb);
3211         struct ext4_group_desc *gdp = NULL;
3212         struct flex_groups *fg;
3213         ext4_group_t flex_group;
3214         int i, err;
3215
3216         sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
3217         if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
3218                 sbi->s_log_groups_per_flex = 0;
3219                 return 1;
3220         }
3221
3222         err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
3223         if (err)
3224                 goto failed;
3225
3226         for (i = 0; i < sbi->s_groups_count; i++) {
3227                 gdp = ext4_get_group_desc(sb, i, NULL);
3228
3229                 flex_group = ext4_flex_group(sbi, i);
3230                 fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
3231                 atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes);
3232                 atomic64_add(ext4_free_group_clusters(sb, gdp),
3233                              &fg->free_clusters);
3234                 atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs);
3235         }
3236
3237         return 1;
3238 failed:
3239         return 0;
3240 }
3241
3242 static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
3243                                    struct ext4_group_desc *gdp)
3244 {
3245         int offset = offsetof(struct ext4_group_desc, bg_checksum);
3246         __u16 crc = 0;
3247         __le32 le_group = cpu_to_le32(block_group);
3248         struct ext4_sb_info *sbi = EXT4_SB(sb);
3249
3250         if (ext4_has_metadata_csum(sbi->s_sb)) {
3251                 /* Use new metadata_csum algorithm */
3252                 __u32 csum32;
3253                 __u16 dummy_csum = 0;
3254
3255                 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
3256                                      sizeof(le_group));
3257                 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
3258                 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
3259                                      sizeof(dummy_csum));
3260                 offset += sizeof(dummy_csum);
3261                 if (offset < sbi->s_desc_size)
3262                         csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
3263                                              sbi->s_desc_size - offset);
3264
3265                 crc = csum32 & 0xFFFF;
3266                 goto out;
3267         }
3268
3269         /* old crc16 code */
3270         if (!ext4_has_feature_gdt_csum(sb))
3271                 return 0;
3272
3273         crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
3274         crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
3275         crc = crc16(crc, (__u8 *)gdp, offset);
3276         offset += sizeof(gdp->bg_checksum); /* skip checksum */
3277         /* for checksum of struct ext4_group_desc do the rest...*/
3278         if (ext4_has_feature_64bit(sb) &&
3279             offset < le16_to_cpu(sbi->s_es->s_desc_size))
3280                 crc = crc16(crc, (__u8 *)gdp + offset,
3281                             le16_to_cpu(sbi->s_es->s_desc_size) -
3282                                 offset);
3283
3284 out:
3285         return cpu_to_le16(crc);
3286 }
3287
3288 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
3289                                 struct ext4_group_desc *gdp)
3290 {
3291         if (ext4_has_group_desc_csum(sb) &&
3292             (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
3293                 return 0;
3294
3295         return 1;
3296 }
3297
3298 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
3299                               struct ext4_group_desc *gdp)
3300 {
3301         if (!ext4_has_group_desc_csum(sb))
3302                 return;
3303         gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
3304 }
3305
3306 /* Called at mount-time, super-block is locked */
3307 static int ext4_check_descriptors(struct super_block *sb,
3308                                   ext4_fsblk_t sb_block,
3309                                   ext4_group_t *first_not_zeroed)
3310 {
3311         struct ext4_sb_info *sbi = EXT4_SB(sb);
3312         ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
3313         ext4_fsblk_t last_block;
3314         ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
3315         ext4_fsblk_t block_bitmap;
3316         ext4_fsblk_t inode_bitmap;
3317         ext4_fsblk_t inode_table;
3318         int flexbg_flag = 0;
3319         ext4_group_t i, grp = sbi->s_groups_count;
3320
3321         if (ext4_has_feature_flex_bg(sb))
3322                 flexbg_flag = 1;
3323
3324         ext4_debug("Checking group descriptors");
3325
3326         for (i = 0; i < sbi->s_groups_count; i++) {
3327                 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
3328
3329                 if (i == sbi->s_groups_count - 1 || flexbg_flag)
3330                         last_block = ext4_blocks_count(sbi->s_es) - 1;
3331                 else
3332                         last_block = first_block +
3333                                 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
3334
3335                 if ((grp == sbi->s_groups_count) &&
3336                    !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3337                         grp = i;
3338
3339                 block_bitmap = ext4_block_bitmap(sb, gdp);
3340                 if (block_bitmap == sb_block) {
3341                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3342                                  "Block bitmap for group %u overlaps "
3343                                  "superblock", i);
3344                         if (!sb_rdonly(sb))
3345                                 return 0;
3346                 }
3347                 if (block_bitmap >= sb_block + 1 &&
3348                     block_bitmap <= last_bg_block) {
3349                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3350                                  "Block bitmap for group %u overlaps "
3351                                  "block group descriptors", i);
3352                         if (!sb_rdonly(sb))
3353                                 return 0;
3354                 }
3355                 if (block_bitmap < first_block || block_bitmap > last_block) {
3356                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3357                                "Block bitmap for group %u not in group "
3358                                "(block %llu)!", i, block_bitmap);
3359                         return 0;
3360                 }
3361                 inode_bitmap = ext4_inode_bitmap(sb, gdp);
3362                 if (inode_bitmap == sb_block) {
3363                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3364                                  "Inode bitmap for group %u overlaps "
3365                                  "superblock", i);
3366                         if (!sb_rdonly(sb))
3367                                 return 0;
3368                 }
3369                 if (inode_bitmap >= sb_block + 1 &&
3370                     inode_bitmap <= last_bg_block) {
3371                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3372                                  "Inode bitmap for group %u overlaps "
3373                                  "block group descriptors", i);
3374                         if (!sb_rdonly(sb))
3375                                 return 0;
3376                 }
3377                 if (inode_bitmap < first_block || inode_bitmap > last_block) {
3378                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3379                                "Inode bitmap for group %u not in group "
3380                                "(block %llu)!", i, inode_bitmap);
3381                         return 0;
3382                 }
3383                 inode_table = ext4_inode_table(sb, gdp);
3384                 if (inode_table == sb_block) {
3385                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3386                                  "Inode table for group %u overlaps "
3387                                  "superblock", i);
3388                         if (!sb_rdonly(sb))
3389                                 return 0;
3390                 }
3391                 if (inode_table >= sb_block + 1 &&
3392                     inode_table <= last_bg_block) {
3393                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3394                                  "Inode table for group %u overlaps "
3395                                  "block group descriptors", i);
3396                         if (!sb_rdonly(sb))
3397                                 return 0;
3398                 }
3399                 if (inode_table < first_block ||
3400                     inode_table + sbi->s_itb_per_group - 1 > last_block) {
3401                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3402                                "Inode table for group %u not in group "
3403                                "(block %llu)!", i, inode_table);
3404                         return 0;
3405                 }
3406                 ext4_lock_group(sb, i);
3407                 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
3408                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3409                                  "Checksum for group %u failed (%u!=%u)",
3410                                  i, le16_to_cpu(ext4_group_desc_csum(sb, i,
3411                                      gdp)), le16_to_cpu(gdp->bg_checksum));
3412                         if (!sb_rdonly(sb)) {
3413                                 ext4_unlock_group(sb, i);
3414                                 return 0;
3415                         }
3416                 }
3417                 ext4_unlock_group(sb, i);
3418                 if (!flexbg_flag)
3419                         first_block += EXT4_BLOCKS_PER_GROUP(sb);
3420         }
3421         if (NULL != first_not_zeroed)
3422                 *first_not_zeroed = grp;
3423         return 1;
3424 }
3425
3426 /*
3427  * Maximal extent format file size.
3428  * Resulting logical blkno at s_maxbytes must fit in our on-disk
3429  * extent format containers, within a sector_t, and within i_blocks
3430  * in the vfs.  ext4 inode has 48 bits of i_block in fsblock units,
3431  * so that won't be a limiting factor.
3432  *
3433  * However there is other limiting factor. We do store extents in the form
3434  * of starting block and length, hence the resulting length of the extent
3435  * covering maximum file size must fit into on-disk format containers as
3436  * well. Given that length is always by 1 unit bigger than max unit (because
3437  * we count 0 as well) we have to lower the s_maxbytes by one fs block.
3438  *
3439  * Note, this does *not* consider any metadata overhead for vfs i_blocks.
3440  */
3441 static loff_t ext4_max_size(int blkbits, int has_huge_files)
3442 {
3443         loff_t res;
3444         loff_t upper_limit = MAX_LFS_FILESIZE;
3445
3446         BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
3447
3448         if (!has_huge_files) {
3449                 upper_limit = (1LL << 32) - 1;
3450
3451                 /* total blocks in file system block size */
3452                 upper_limit >>= (blkbits - 9);
3453                 upper_limit <<= blkbits;
3454         }
3455
3456         /*
3457          * 32-bit extent-start container, ee_block. We lower the maxbytes
3458          * by one fs block, so ee_len can cover the extent of maximum file
3459          * size
3460          */
3461         res = (1LL << 32) - 1;
3462         res <<= blkbits;
3463
3464         /* Sanity check against vm- & vfs- imposed limits */
3465         if (res > upper_limit)
3466                 res = upper_limit;
3467
3468         return res;
3469 }
3470
3471 /*
3472  * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
3473  * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
3474  * We need to be 1 filesystem block less than the 2^48 sector limit.
3475  */
3476 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
3477 {
3478         unsigned long long upper_limit, res = EXT4_NDIR_BLOCKS;
3479         int meta_blocks;
3480
3481         /*
3482          * This is calculated to be the largest file size for a dense, block
3483          * mapped file such that the file's total number of 512-byte sectors,
3484          * including data and all indirect blocks, does not exceed (2^48 - 1).
3485          *
3486          * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
3487          * number of 512-byte sectors of the file.
3488          */
3489         if (!has_huge_files) {
3490                 /*
3491                  * !has_huge_files or implies that the inode i_block field
3492                  * represents total file blocks in 2^32 512-byte sectors ==
3493                  * size of vfs inode i_blocks * 8
3494                  */
3495                 upper_limit = (1LL << 32) - 1;
3496
3497                 /* total blocks in file system block size */
3498                 upper_limit >>= (bits - 9);
3499
3500         } else {
3501                 /*
3502                  * We use 48 bit ext4_inode i_blocks
3503                  * With EXT4_HUGE_FILE_FL set the i_blocks
3504                  * represent total number of blocks in
3505                  * file system block size
3506                  */
3507                 upper_limit = (1LL << 48) - 1;
3508
3509         }
3510
3511         /* indirect blocks */
3512         meta_blocks = 1;
3513         /* double indirect blocks */
3514         meta_blocks += 1 + (1LL << (bits-2));
3515         /* tripple indirect blocks */
3516         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
3517
3518         upper_limit -= meta_blocks;
3519         upper_limit <<= bits;
3520
3521         res += 1LL << (bits-2);
3522         res += 1LL << (2*(bits-2));
3523         res += 1LL << (3*(bits-2));
3524         res <<= bits;
3525         if (res > upper_limit)
3526                 res = upper_limit;
3527
3528         if (res > MAX_LFS_FILESIZE)
3529                 res = MAX_LFS_FILESIZE;
3530
3531         return (loff_t)res;
3532 }
3533
3534 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
3535                                    ext4_fsblk_t logical_sb_block, int nr)
3536 {
3537         struct ext4_sb_info *sbi = EXT4_SB(sb);
3538         ext4_group_t bg, first_meta_bg;
3539         int has_super = 0;
3540
3541         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
3542
3543         if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
3544                 return logical_sb_block + nr + 1;
3545         bg = sbi->s_desc_per_block * nr;
3546         if (ext4_bg_has_super(sb, bg))
3547                 has_super = 1;
3548
3549         /*
3550          * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
3551          * block 2, not 1.  If s_first_data_block == 0 (bigalloc is enabled
3552          * on modern mke2fs or blksize > 1k on older mke2fs) then we must
3553          * compensate.
3554          */
3555         if (sb->s_blocksize == 1024 && nr == 0 &&
3556             le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
3557                 has_super++;
3558
3559         return (has_super + ext4_group_first_block_no(sb, bg));
3560 }
3561
3562 /**
3563  * ext4_get_stripe_size: Get the stripe size.
3564  * @sbi: In memory super block info
3565  *
3566  * If we have specified it via mount option, then
3567  * use the mount option value. If the value specified at mount time is
3568  * greater than the blocks per group use the super block value.
3569  * If the super block value is greater than blocks per group return 0.
3570  * Allocator needs it be less than blocks per group.
3571  *
3572  */
3573 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
3574 {
3575         unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
3576         unsigned long stripe_width =
3577                         le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3578         int ret;
3579
3580         if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3581                 ret = sbi->s_stripe;
3582         else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3583                 ret = stripe_width;
3584         else if (stride && stride <= sbi->s_blocks_per_group)
3585                 ret = stride;
3586         else
3587                 ret = 0;
3588
3589         /*
3590          * If the stripe width is 1, this makes no sense and
3591          * we set it to 0 to turn off stripe handling code.
3592          */
3593         if (ret <= 1)
3594                 ret = 0;
3595
3596         return ret;
3597 }
3598
3599 /*
3600  * Check whether this filesystem can be mounted based on
3601  * the features present and the RDONLY/RDWR mount requested.
3602  * Returns 1 if this filesystem can be mounted as requested,
3603  * 0 if it cannot be.
3604  */
3605 int ext4_feature_set_ok(struct super_block *sb, int readonly)
3606 {
3607         if (ext4_has_unknown_ext4_incompat_features(sb)) {
3608                 ext4_msg(sb, KERN_ERR,
3609                         "Couldn't mount because of "
3610                         "unsupported optional features (%x)",
3611                         (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
3612                         ~EXT4_FEATURE_INCOMPAT_SUPP));
3613                 return 0;
3614         }
3615
3616 #ifndef CONFIG_UNICODE
3617         if (ext4_has_feature_casefold(sb)) {
3618                 ext4_msg(sb, KERN_ERR,
3619                          "Filesystem with casefold feature cannot be "
3620                          "mounted without CONFIG_UNICODE");
3621                 return 0;
3622         }
3623 #endif
3624
3625         if (readonly)
3626                 return 1;
3627
3628         if (ext4_has_feature_readonly(sb)) {
3629                 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
3630                 sb->s_flags |= SB_RDONLY;
3631                 return 1;
3632         }
3633
3634         /* Check that feature set is OK for a read-write mount */
3635         if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
3636                 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
3637                          "unsupported optional features (%x)",
3638                          (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
3639                                 ~EXT4_FEATURE_RO_COMPAT_SUPP));
3640                 return 0;
3641         }
3642         if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
3643                 ext4_msg(sb, KERN_ERR,
3644                          "Can't support bigalloc feature without "
3645                          "extents feature\n");
3646                 return 0;
3647         }
3648
3649 #if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
3650         if (!readonly && (ext4_has_feature_quota(sb) ||
3651                           ext4_has_feature_project(sb))) {
3652                 ext4_msg(sb, KERN_ERR,
3653                          "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
3654                 return 0;
3655         }
3656 #endif  /* CONFIG_QUOTA */
3657         return 1;
3658 }
3659
3660 /*
3661  * This function is called once a day if we have errors logged
3662  * on the file system
3663  */
3664 static void print_daily_error_info(struct timer_list *t)
3665 {
3666         struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
3667         struct super_block *sb = sbi->s_sb;
3668         struct ext4_super_block *es = sbi->s_es;
3669
3670         if (es->s_error_count)
3671                 /* fsck newer than v1.41.13 is needed to clean this condition. */
3672                 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
3673                          le32_to_cpu(es->s_error_count));
3674         if (es->s_first_error_time) {
3675                 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3676                        sb->s_id,
3677                        ext4_get_tstamp(es, s_first_error_time),
3678                        (int) sizeof(es->s_first_error_func),
3679                        es->s_first_error_func,
3680                        le32_to_cpu(es->s_first_error_line));
3681                 if (es->s_first_error_ino)
3682                         printk(KERN_CONT ": inode %u",
3683                                le32_to_cpu(es->s_first_error_ino));
3684                 if (es->s_first_error_block)
3685                         printk(KERN_CONT ": block %llu", (unsigned long long)
3686                                le64_to_cpu(es->s_first_error_block));
3687                 printk(KERN_CONT "\n");
3688         }
3689         if (es->s_last_error_time) {
3690                 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3691                        sb->s_id,
3692                        ext4_get_tstamp(es, s_last_error_time),
3693                        (int) sizeof(es->s_last_error_func),
3694                        es->s_last_error_func,
3695                        le32_to_cpu(es->s_last_error_line));
3696                 if (es->s_last_error_ino)
3697                         printk(KERN_CONT ": inode %u",
3698                                le32_to_cpu(es->s_last_error_ino));
3699                 if (es->s_last_error_block)
3700                         printk(KERN_CONT ": block %llu", (unsigned long long)
3701                                le64_to_cpu(es->s_last_error_block));
3702                 printk(KERN_CONT "\n");
3703         }
3704         mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
3705 }
3706
3707 /* Find next suitable group and run ext4_init_inode_table */
3708 static int ext4_run_li_request(struct ext4_li_request *elr)
3709 {
3710         struct ext4_group_desc *gdp = NULL;
3711         struct super_block *sb = elr->lr_super;
3712         ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3713         ext4_group_t group = elr->lr_next_group;
3714         unsigned int prefetch_ios = 0;
3715         int ret = 0;
3716         u64 start_time;
3717
3718         if (elr->lr_mode == EXT4_LI_MODE_PREFETCH_BBITMAP) {
3719                 elr->lr_next_group = ext4_mb_prefetch(sb, group,
3720                                 EXT4_SB(sb)->s_mb_prefetch, &prefetch_ios);
3721                 if (prefetch_ios)
3722                         ext4_mb_prefetch_fini(sb, elr->lr_next_group,
3723                                               prefetch_ios);
3724                 trace_ext4_prefetch_bitmaps(sb, group, elr->lr_next_group,
3725                                             prefetch_ios);
3726                 if (group >= elr->lr_next_group) {
3727                         ret = 1;
3728                         if (elr->lr_first_not_zeroed != ngroups &&
3729                             !sb_rdonly(sb) && test_opt(sb, INIT_INODE_TABLE)) {
3730                                 elr->lr_next_group = elr->lr_first_not_zeroed;
3731                                 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3732                                 ret = 0;
3733                         }
3734                 }
3735                 return ret;
3736         }
3737
3738         for (; group < ngroups; group++) {
3739                 gdp = ext4_get_group_desc(sb, group, NULL);
3740                 if (!gdp) {
3741                         ret = 1;
3742                         break;
3743                 }
3744
3745                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3746                         break;
3747         }
3748
3749         if (group >= ngroups)
3750                 ret = 1;
3751
3752         if (!ret) {
3753                 start_time = ktime_get_real_ns();
3754                 ret = ext4_init_inode_table(sb, group,
3755                                             elr->lr_timeout ? 0 : 1);
3756                 trace_ext4_lazy_itable_init(sb, group);
3757                 if (elr->lr_timeout == 0) {
3758                         elr->lr_timeout = nsecs_to_jiffies((ktime_get_real_ns() - start_time) *
3759                                 EXT4_SB(elr->lr_super)->s_li_wait_mult);
3760                 }
3761                 elr->lr_next_sched = jiffies + elr->lr_timeout;
3762                 elr->lr_next_group = group + 1;
3763         }
3764         return ret;
3765 }
3766
3767 /*
3768  * Remove lr_request from the list_request and free the
3769  * request structure. Should be called with li_list_mtx held
3770  */
3771 static void ext4_remove_li_request(struct ext4_li_request *elr)
3772 {
3773         if (!elr)
3774                 return;
3775
3776         list_del(&elr->lr_request);
3777         EXT4_SB(elr->lr_super)->s_li_request = NULL;
3778         kfree(elr);
3779 }
3780
3781 static void ext4_unregister_li_request(struct super_block *sb)
3782 {
3783         mutex_lock(&ext4_li_mtx);
3784         if (!ext4_li_info) {
3785                 mutex_unlock(&ext4_li_mtx);
3786                 return;
3787         }
3788
3789         mutex_lock(&ext4_li_info->li_list_mtx);
3790         ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
3791         mutex_unlock(&ext4_li_info->li_list_mtx);
3792         mutex_unlock(&ext4_li_mtx);
3793 }
3794
3795 static struct task_struct *ext4_lazyinit_task;
3796
3797 /*
3798  * This is the function where ext4lazyinit thread lives. It walks
3799  * through the request list searching for next scheduled filesystem.
3800  * When such a fs is found, run the lazy initialization request
3801  * (ext4_rn_li_request) and keep track of the time spend in this
3802  * function. Based on that time we compute next schedule time of
3803  * the request. When walking through the list is complete, compute
3804  * next waking time and put itself into sleep.
3805  */
3806 static int ext4_lazyinit_thread(void *arg)
3807 {
3808         struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3809         struct list_head *pos, *n;
3810         struct ext4_li_request *elr;
3811         unsigned long next_wakeup, cur;
3812
3813         BUG_ON(NULL == eli);
3814
3815 cont_thread:
3816         while (true) {
3817                 next_wakeup = MAX_JIFFY_OFFSET;
3818
3819                 mutex_lock(&eli->li_list_mtx);
3820                 if (list_empty(&eli->li_request_list)) {
3821                         mutex_unlock(&eli->li_list_mtx);
3822                         goto exit_thread;
3823                 }
3824                 list_for_each_safe(pos, n, &eli->li_request_list) {
3825                         int err = 0;
3826                         int progress = 0;
3827                         elr = list_entry(pos, struct ext4_li_request,
3828                                          lr_request);
3829
3830                         if (time_before(jiffies, elr->lr_next_sched)) {
3831                                 if (time_before(elr->lr_next_sched, next_wakeup))
3832                                         next_wakeup = elr->lr_next_sched;
3833                                 continue;
3834                         }
3835                         if (down_read_trylock(&elr->lr_super->s_umount)) {
3836                                 if (sb_start_write_trylock(elr->lr_super)) {
3837                                         progress = 1;
3838                                         /*
3839                                          * We hold sb->s_umount, sb can not
3840                                          * be removed from the list, it is
3841                                          * now safe to drop li_list_mtx
3842                                          */
3843                                         mutex_unlock(&eli->li_list_mtx);
3844                                         err = ext4_run_li_request(elr);
3845                                         sb_end_write(elr->lr_super);
3846                                         mutex_lock(&eli->li_list_mtx);
3847                                         n = pos->next;
3848                                 }
3849                                 up_read((&elr->lr_super->s_umount));
3850                         }
3851                         /* error, remove the lazy_init job */
3852                         if (err) {
3853                                 ext4_remove_li_request(elr);
3854                                 continue;
3855                         }
3856                         if (!progress) {
3857                                 elr->lr_next_sched = jiffies +
3858                                         (prandom_u32()
3859                                          % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3860                         }
3861                         if (time_before(elr->lr_next_sched, next_wakeup))
3862                                 next_wakeup = elr->lr_next_sched;
3863                 }
3864                 mutex_unlock(&eli->li_list_mtx);
3865
3866                 try_to_freeze();
3867
3868                 cur = jiffies;
3869                 if ((time_after_eq(cur, next_wakeup)) ||
3870                     (MAX_JIFFY_OFFSET == next_wakeup)) {
3871                         cond_resched();
3872                         continue;
3873                 }
3874
3875                 schedule_timeout_interruptible(next_wakeup - cur);
3876
3877                 if (kthread_should_stop()) {
3878                         ext4_clear_request_list();
3879                         goto exit_thread;
3880                 }
3881         }
3882
3883 exit_thread:
3884         /*
3885          * It looks like the request list is empty, but we need
3886          * to check it under the li_list_mtx lock, to prevent any
3887          * additions into it, and of course we should lock ext4_li_mtx
3888          * to atomically free the list and ext4_li_info, because at
3889          * this point another ext4 filesystem could be registering
3890          * new one.
3891          */
3892         mutex_lock(&ext4_li_mtx);
3893         mutex_lock(&eli->li_list_mtx);
3894         if (!list_empty(&eli->li_request_list)) {
3895                 mutex_unlock(&eli->li_list_mtx);
3896                 mutex_unlock(&ext4_li_mtx);
3897                 goto cont_thread;
3898         }
3899         mutex_unlock(&eli->li_list_mtx);
3900         kfree(ext4_li_info);
3901         ext4_li_info = NULL;
3902         mutex_unlock(&ext4_li_mtx);
3903
3904         return 0;
3905 }
3906
3907 static void ext4_clear_request_list(void)
3908 {
3909         struct list_head *pos, *n;
3910         struct ext4_li_request *elr;
3911
3912         mutex_lock(&ext4_li_info->li_list_mtx);
3913         list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3914                 elr = list_entry(pos, struct ext4_li_request,
3915                                  lr_request);
3916                 ext4_remove_li_request(elr);
3917         }
3918         mutex_unlock(&ext4_li_info->li_list_mtx);
3919 }
3920
3921 static int ext4_run_lazyinit_thread(void)
3922 {
3923         ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3924                                          ext4_li_info, "ext4lazyinit");
3925         if (IS_ERR(ext4_lazyinit_task)) {
3926                 int err = PTR_ERR(ext4_lazyinit_task);
3927                 ext4_clear_request_list();
3928                 kfree(ext4_li_info);
3929                 ext4_li_info = NULL;
3930                 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3931                                  "initialization thread\n",
3932                                  err);
3933                 return err;
3934         }
3935         ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3936         return 0;
3937 }
3938
3939 /*
3940  * Check whether it make sense to run itable init. thread or not.
3941  * If there is at least one uninitialized inode table, return
3942  * corresponding group number, else the loop goes through all
3943  * groups and return total number of groups.
3944  */
3945 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3946 {
3947         ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3948         struct ext4_group_desc *gdp = NULL;
3949
3950         if (!ext4_has_group_desc_csum(sb))
3951                 return ngroups;
3952
3953         for (group = 0; group < ngroups; group++) {
3954                 gdp = ext4_get_group_desc(sb, group, NULL);
3955                 if (!gdp)
3956                         continue;
3957
3958                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3959                         break;
3960         }
3961
3962         return group;
3963 }
3964
3965 static int ext4_li_info_new(void)
3966 {
3967         struct ext4_lazy_init *eli = NULL;
3968
3969         eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3970         if (!eli)
3971                 return -ENOMEM;
3972
3973         INIT_LIST_HEAD(&eli->li_request_list);
3974         mutex_init(&eli->li_list_mtx);
3975
3976         eli->li_state |= EXT4_LAZYINIT_QUIT;
3977
3978         ext4_li_info = eli;
3979
3980         return 0;
3981 }
3982
3983 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3984                                             ext4_group_t start)
3985 {
3986         struct ext4_li_request *elr;
3987
3988         elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3989         if (!elr)
3990                 return NULL;
3991
3992         elr->lr_super = sb;
3993         elr->lr_first_not_zeroed = start;
3994         if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS)) {
3995                 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3996                 elr->lr_next_group = start;
3997         } else {
3998                 elr->lr_mode = EXT4_LI_MODE_PREFETCH_BBITMAP;
3999         }
4000
4001         /*
4002          * Randomize first schedule time of the request to
4003          * spread the inode table initialization requests
4004          * better.
4005          */
4006         elr->lr_next_sched = jiffies + (prandom_u32() %
4007                                 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
4008         return elr;
4009 }
4010
4011 int ext4_register_li_request(struct super_block *sb,
4012                              ext4_group_t first_not_zeroed)
4013 {
4014         struct ext4_sb_info *sbi = EXT4_SB(sb);
4015         struct ext4_li_request *elr = NULL;
4016         ext4_group_t ngroups = sbi->s_groups_count;
4017         int ret = 0;
4018
4019         mutex_lock(&ext4_li_mtx);
4020         if (sbi->s_li_request != NULL) {
4021                 /*
4022                  * Reset timeout so it can be computed again, because
4023                  * s_li_wait_mult might have changed.
4024                  */
4025                 sbi->s_li_request->lr_timeout = 0;
4026                 goto out;
4027         }
4028
4029         if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) &&
4030             (first_not_zeroed == ngroups || sb_rdonly(sb) ||
4031              !test_opt(sb, INIT_INODE_TABLE)))
4032                 goto out;
4033
4034         elr = ext4_li_request_new(sb, first_not_zeroed);
4035         if (!elr) {
4036                 ret = -ENOMEM;
4037                 goto out;
4038         }
4039
4040         if (NULL == ext4_li_info) {
4041                 ret = ext4_li_info_new();
4042                 if (ret)
4043                         goto out;
4044         }
4045
4046         mutex_lock(&ext4_li_info->li_list_mtx);
4047         list_add(&elr->lr_request, &ext4_li_info->li_request_list);
4048         mutex_unlock(&ext4_li_info->li_list_mtx);
4049
4050         sbi->s_li_request = elr;
4051         /*
4052          * set elr to NULL here since it has been inserted to
4053          * the request_list and the removal and free of it is
4054          * handled by ext4_clear_request_list from now on.
4055          */
4056         elr = NULL;
4057
4058         if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
4059                 ret = ext4_run_lazyinit_thread();
4060                 if (ret)
4061                         goto out;
4062         }
4063 out:
4064         mutex_unlock(&ext4_li_mtx);
4065         if (ret)
4066                 kfree(elr);
4067         return ret;
4068 }
4069
4070 /*
4071  * We do not need to lock anything since this is called on
4072  * module unload.
4073  */
4074 static void ext4_destroy_lazyinit_thread(void)
4075 {
4076         /*
4077          * If thread exited earlier
4078          * there's nothing to be done.
4079          */
4080         if (!ext4_li_info || !ext4_lazyinit_task)
4081                 return;
4082
4083         kthread_stop(ext4_lazyinit_task);
4084 }
4085
4086 static int set_journal_csum_feature_set(struct super_block *sb)
4087 {
4088         int ret = 1;
4089         int compat, incompat;
4090         struct ext4_sb_info *sbi = EXT4_SB(sb);
4091
4092         if (ext4_has_metadata_csum(sb)) {
4093                 /* journal checksum v3 */
4094                 compat = 0;
4095                 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
4096         } else {
4097                 /* journal checksum v1 */
4098                 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
4099                 incompat = 0;
4100         }
4101
4102         jbd2_journal_clear_features(sbi->s_journal,
4103                         JBD2_FEATURE_COMPAT_CHECKSUM, 0,
4104                         JBD2_FEATURE_INCOMPAT_CSUM_V3 |
4105                         JBD2_FEATURE_INCOMPAT_CSUM_V2);
4106         if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4107                 ret = jbd2_journal_set_features(sbi->s_journal,
4108                                 compat, 0,
4109                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
4110                                 incompat);
4111         } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
4112                 ret = jbd2_journal_set_features(sbi->s_journal,
4113                                 compat, 0,
4114                                 incompat);
4115                 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
4116                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
4117         } else {
4118                 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
4119                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
4120         }
4121
4122         return ret;
4123 }
4124
4125 /*
4126  * Note: calculating the overhead so we can be compatible with
4127  * historical BSD practice is quite difficult in the face of
4128  * clusters/bigalloc.  This is because multiple metadata blocks from
4129  * different block group can end up in the same allocation cluster.
4130  * Calculating the exact overhead in the face of clustered allocation
4131  * requires either O(all block bitmaps) in memory or O(number of block
4132  * groups**2) in time.  We will still calculate the superblock for
4133  * older file systems --- and if we come across with a bigalloc file
4134  * system with zero in s_overhead_clusters the estimate will be close to
4135  * correct especially for very large cluster sizes --- but for newer
4136  * file systems, it's better to calculate this figure once at mkfs
4137  * time, and store it in the superblock.  If the superblock value is
4138  * present (even for non-bigalloc file systems), we will use it.
4139  */
4140 static int count_overhead(struct super_block *sb, ext4_group_t grp,
4141                           char *buf)
4142 {
4143         struct ext4_sb_info     *sbi = EXT4_SB(sb);
4144         struct ext4_group_desc  *gdp;
4145         ext4_fsblk_t            first_block, last_block, b;
4146         ext4_group_t            i, ngroups = ext4_get_groups_count(sb);
4147         int                     s, j, count = 0;
4148
4149         if (!ext4_has_feature_bigalloc(sb))
4150                 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
4151                         sbi->s_itb_per_group + 2);
4152
4153         first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
4154                 (grp * EXT4_BLOCKS_PER_GROUP(sb));
4155         last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
4156         for (i = 0; i < ngroups; i++) {
4157                 gdp = ext4_get_group_desc(sb, i, NULL);
4158                 b = ext4_block_bitmap(sb, gdp);
4159                 if (b >= first_block && b <= last_block) {
4160                         ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
4161                         count++;
4162                 }
4163                 b = ext4_inode_bitmap(sb, gdp);
4164                 if (b >= first_block && b <= last_block) {
4165                         ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
4166                         count++;
4167                 }
4168                 b = ext4_inode_table(sb, gdp);
4169                 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
4170                         for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
4171                                 int c = EXT4_B2C(sbi, b - first_block);
4172                                 ext4_set_bit(c, buf);
4173                                 count++;
4174                         }
4175                 if (i != grp)
4176                         continue;
4177                 s = 0;
4178                 if (ext4_bg_has_super(sb, grp)) {
4179                         ext4_set_bit(s++, buf);
4180                         count++;
4181                 }
4182                 j = ext4_bg_num_gdb(sb, grp);
4183                 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
4184                         ext4_error(sb, "Invalid number of block group "
4185                                    "descriptor blocks: %d", j);
4186                         j = EXT4_BLOCKS_PER_GROUP(sb) - s;
4187                 }
4188                 count += j;
4189                 for (; j > 0; j--)
4190                         ext4_set_bit(EXT4_B2C(sbi, s++), buf);
4191         }
4192         if (!count)
4193                 return 0;
4194         return EXT4_CLUSTERS_PER_GROUP(sb) -
4195                 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
4196 }
4197
4198 /*
4199  * Compute the overhead and stash it in sbi->s_overhead
4200  */
4201 int ext4_calculate_overhead(struct super_block *sb)
4202 {
4203         struct ext4_sb_info *sbi = EXT4_SB(sb);
4204         struct ext4_super_block *es = sbi->s_es;
4205         struct inode *j_inode;
4206         unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
4207         ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4208         ext4_fsblk_t overhead = 0;
4209         char *buf = (char *) get_zeroed_page(GFP_NOFS);
4210
4211         if (!buf)
4212                 return -ENOMEM;
4213
4214         /*
4215          * Compute the overhead (FS structures).  This is constant
4216          * for a given filesystem unless the number of block groups
4217          * changes so we cache the previous value until it does.
4218          */
4219
4220         /*
4221          * All of the blocks before first_data_block are overhead
4222          */
4223         overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
4224
4225         /*
4226          * Add the overhead found in each block group
4227          */
4228         for (i = 0; i < ngroups; i++) {
4229                 int blks;
4230
4231                 blks = count_overhead(sb, i, buf);
4232                 overhead += blks;
4233                 if (blks)
4234                         memset(buf, 0, PAGE_SIZE);
4235                 cond_resched();
4236         }
4237
4238         /*
4239          * Add the internal journal blocks whether the journal has been
4240          * loaded or not
4241          */
4242         if (sbi->s_journal && !sbi->s_journal_bdev)
4243                 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_total_len);
4244         else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {
4245                 /* j_inum for internal journal is non-zero */
4246                 j_inode = ext4_get_journal_inode(sb, j_inum);
4247                 if (j_inode) {
4248                         j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
4249                         overhead += EXT4_NUM_B2C(sbi, j_blocks);
4250                         iput(j_inode);
4251                 } else {
4252                         ext4_msg(sb, KERN_ERR, "can't get journal size");
4253                 }
4254         }
4255         sbi->s_overhead = overhead;
4256         smp_wmb();
4257         free_page((unsigned long) buf);
4258         return 0;
4259 }
4260
4261 static void ext4_set_resv_clusters(struct super_block *sb)
4262 {
4263         ext4_fsblk_t resv_clusters;
4264         struct ext4_sb_info *sbi = EXT4_SB(sb);
4265
4266         /*
4267          * There's no need to reserve anything when we aren't using extents.
4268          * The space estimates are exact, there are no unwritten extents,
4269          * hole punching doesn't need new metadata... This is needed especially
4270          * to keep ext2/3 backward compatibility.
4271          */
4272         if (!ext4_has_feature_extents(sb))
4273                 return;
4274         /*
4275          * By default we reserve 2% or 4096 clusters, whichever is smaller.
4276          * This should cover the situations where we can not afford to run
4277          * out of space like for example punch hole, or converting
4278          * unwritten extents in delalloc path. In most cases such
4279          * allocation would require 1, or 2 blocks, higher numbers are
4280          * very rare.
4281          */
4282         resv_clusters = (ext4_blocks_count(sbi->s_es) >>
4283                          sbi->s_cluster_bits);
4284
4285         do_div(resv_clusters, 50);
4286         resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
4287
4288         atomic64_set(&sbi->s_resv_clusters, resv_clusters);
4289 }
4290
4291 static const char *ext4_quota_mode(struct super_block *sb)
4292 {
4293 #ifdef CONFIG_QUOTA
4294         if (!ext4_quota_capable(sb))
4295                 return "none";
4296
4297         if (EXT4_SB(sb)->s_journal && ext4_is_quota_journalled(sb))
4298                 return "journalled";
4299         else
4300                 return "writeback";
4301 #else
4302         return "disabled";
4303 #endif
4304 }
4305
4306 static void ext4_setup_csum_trigger(struct super_block *sb,
4307                                     enum ext4_journal_trigger_type type,
4308                                     void (*trigger)(
4309                                         struct jbd2_buffer_trigger_type *type,
4310                                         struct buffer_head *bh,
4311                                         void *mapped_data,
4312                                         size_t size))
4313 {
4314         struct ext4_sb_info *sbi = EXT4_SB(sb);
4315
4316         sbi->s_journal_triggers[type].sb = sb;
4317         sbi->s_journal_triggers[type].tr_triggers.t_frozen = trigger;
4318 }
4319
4320 static void ext4_free_sbi(struct ext4_sb_info *sbi)
4321 {
4322         if (!sbi)
4323                 return;
4324
4325         kfree(sbi->s_blockgroup_lock);
4326         fs_put_dax(sbi->s_daxdev);
4327         kfree(sbi);
4328 }
4329
4330 static struct ext4_sb_info *ext4_alloc_sbi(struct super_block *sb)
4331 {
4332         struct ext4_sb_info *sbi;
4333
4334         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
4335         if (!sbi)
4336                 return NULL;
4337
4338         sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev);
4339
4340         sbi->s_blockgroup_lock =
4341                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
4342
4343         if (!sbi->s_blockgroup_lock)
4344                 goto err_out;
4345
4346         sb->s_fs_info = sbi;
4347         sbi->s_sb = sb;
4348         return sbi;
4349 err_out:
4350         fs_put_dax(sbi->s_daxdev);
4351         kfree(sbi);
4352         return NULL;
4353 }
4354
4355 static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
4356 {
4357         struct buffer_head *bh, **group_desc;
4358         struct ext4_super_block *es = NULL;
4359         struct ext4_sb_info *sbi = EXT4_SB(sb);
4360         struct flex_groups **flex_groups;
4361         ext4_fsblk_t block;
4362         ext4_fsblk_t logical_sb_block;
4363         unsigned long offset = 0;
4364         unsigned long def_mount_opts;
4365         struct inode *root;
4366         int ret = -ENOMEM;
4367         int blocksize, clustersize;
4368         unsigned int db_count;
4369         unsigned int i;
4370         int needs_recovery, has_huge_files;
4371         __u64 blocks_count;
4372         int err = 0;
4373         ext4_group_t first_not_zeroed;
4374         struct ext4_fs_context *ctx = fc->fs_private;
4375         int silent = fc->sb_flags & SB_SILENT;
4376
4377         /* Set defaults for the variables that will be set during parsing */
4378         ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4379         ctx->mb_optimize_scan = DEFAULT_MB_OPTIMIZE_SCAN;
4380
4381         sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
4382         sbi->s_sectors_written_start =
4383                 part_stat_read(sb->s_bdev, sectors[STAT_WRITE]);
4384
4385         /* -EINVAL is default */
4386         ret = -EINVAL;
4387         blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
4388         if (!blocksize) {
4389                 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
4390                 goto out_fail;
4391         }
4392
4393         /*
4394          * The ext4 superblock will not be buffer aligned for other than 1kB
4395          * block sizes.  We need to calculate the offset from buffer start.
4396          */
4397         if (blocksize != EXT4_MIN_BLOCK_SIZE) {
4398                 logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE;
4399                 offset = do_div(logical_sb_block, blocksize);
4400         } else {
4401                 logical_sb_block = sbi->s_sb_block;
4402         }
4403
4404         bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
4405         if (IS_ERR(bh)) {
4406                 ext4_msg(sb, KERN_ERR, "unable to read superblock");
4407                 ret = PTR_ERR(bh);
4408                 goto out_fail;
4409         }
4410         /*
4411          * Note: s_es must be initialized as soon as possible because
4412          *       some ext4 macro-instructions depend on its value
4413          */
4414         es = (struct ext4_super_block *) (bh->b_data + offset);
4415         sbi->s_es = es;
4416         sb->s_magic = le16_to_cpu(es->s_magic);
4417         if (sb->s_magic != EXT4_SUPER_MAGIC)
4418                 goto cantfind_ext4;
4419         sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
4420
4421         /* Warn if metadata_csum and gdt_csum are both set. */
4422         if (ext4_has_feature_metadata_csum(sb) &&
4423             ext4_has_feature_gdt_csum(sb))
4424                 ext4_warning(sb, "metadata_csum and uninit_bg are "
4425                              "redundant flags; please run fsck.");
4426
4427         /* Check for a known checksum algorithm */
4428         if (!ext4_verify_csum_type(sb, es)) {
4429                 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
4430                          "unknown checksum algorithm.");
4431                 silent = 1;
4432                 goto cantfind_ext4;
4433         }
4434         ext4_setup_csum_trigger(sb, EXT4_JTR_ORPHAN_FILE,
4435                                 ext4_orphan_file_block_trigger);
4436
4437         /* Load the checksum driver */
4438         sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
4439         if (IS_ERR(sbi->s_chksum_driver)) {
4440                 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
4441                 ret = PTR_ERR(sbi->s_chksum_driver);
4442                 sbi->s_chksum_driver = NULL;
4443                 goto failed_mount;
4444         }
4445
4446         /* Check superblock checksum */
4447         if (!ext4_superblock_csum_verify(sb, es)) {
4448                 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
4449                          "invalid superblock checksum.  Run e2fsck?");
4450                 silent = 1;
4451                 ret = -EFSBADCRC;
4452                 goto cantfind_ext4;
4453         }
4454
4455         /* Precompute checksum seed for all metadata */
4456         if (ext4_has_feature_csum_seed(sb))
4457                 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
4458         else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
4459                 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
4460                                                sizeof(es->s_uuid));
4461
4462         /* Set defaults before we parse the mount options */
4463         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
4464         set_opt(sb, INIT_INODE_TABLE);
4465         if (def_mount_opts & EXT4_DEFM_DEBUG)
4466                 set_opt(sb, DEBUG);
4467         if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
4468                 set_opt(sb, GRPID);
4469         if (def_mount_opts & EXT4_DEFM_UID16)
4470                 set_opt(sb, NO_UID32);
4471         /* xattr user namespace & acls are now defaulted on */
4472         set_opt(sb, XATTR_USER);
4473 #ifdef CONFIG_EXT4_FS_POSIX_ACL
4474         set_opt(sb, POSIX_ACL);
4475 #endif
4476         if (ext4_has_feature_fast_commit(sb))
4477                 set_opt2(sb, JOURNAL_FAST_COMMIT);
4478         /* don't forget to enable journal_csum when metadata_csum is enabled. */
4479         if (ext4_has_metadata_csum(sb))
4480                 set_opt(sb, JOURNAL_CHECKSUM);
4481
4482         if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
4483                 set_opt(sb, JOURNAL_DATA);
4484         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
4485                 set_opt(sb, ORDERED_DATA);
4486         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
4487                 set_opt(sb, WRITEBACK_DATA);
4488
4489         if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
4490                 set_opt(sb, ERRORS_PANIC);
4491         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
4492                 set_opt(sb, ERRORS_CONT);
4493         else
4494                 set_opt(sb, ERRORS_RO);
4495         /* block_validity enabled by default; disable with noblock_validity */
4496         set_opt(sb, BLOCK_VALIDITY);
4497         if (def_mount_opts & EXT4_DEFM_DISCARD)
4498                 set_opt(sb, DISCARD);
4499
4500         sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
4501         sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
4502         sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
4503         sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
4504         sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
4505
4506         if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
4507                 set_opt(sb, BARRIER);
4508
4509         /*
4510          * enable delayed allocation by default
4511          * Use -o nodelalloc to turn it off
4512          */
4513         if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
4514             ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
4515                 set_opt(sb, DELALLOC);
4516
4517         /*
4518          * set default s_li_wait_mult for lazyinit, for the case there is
4519          * no mount option specified.
4520          */
4521         sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
4522
4523         if (le32_to_cpu(es->s_log_block_size) >
4524             (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4525                 ext4_msg(sb, KERN_ERR,
4526                          "Invalid log block size: %u",
4527                          le32_to_cpu(es->s_log_block_size));
4528                 goto failed_mount;
4529         }
4530         if (le32_to_cpu(es->s_log_cluster_size) >
4531             (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4532                 ext4_msg(sb, KERN_ERR,
4533                          "Invalid log cluster size: %u",
4534                          le32_to_cpu(es->s_log_cluster_size));
4535                 goto failed_mount;
4536         }
4537
4538         blocksize = EXT4_MIN_BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
4539
4540         if (blocksize == PAGE_SIZE)
4541                 set_opt(sb, DIOREAD_NOLOCK);
4542
4543         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
4544                 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
4545                 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
4546         } else {
4547                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
4548                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
4549                 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
4550                         ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
4551                                  sbi->s_first_ino);
4552                         goto failed_mount;
4553                 }
4554                 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
4555                     (!is_power_of_2(sbi->s_inode_size)) ||
4556                     (sbi->s_inode_size > blocksize)) {
4557                         ext4_msg(sb, KERN_ERR,
4558                                "unsupported inode size: %d",
4559                                sbi->s_inode_size);
4560                         ext4_msg(sb, KERN_ERR, "blocksize: %d", blocksize);
4561                         goto failed_mount;
4562                 }
4563                 /*
4564                  * i_atime_extra is the last extra field available for
4565                  * [acm]times in struct ext4_inode. Checking for that
4566                  * field should suffice to ensure we have extra space
4567                  * for all three.
4568                  */
4569                 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
4570                         sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
4571                         sb->s_time_gran = 1;
4572                         sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
4573                 } else {
4574                         sb->s_time_gran = NSEC_PER_SEC;
4575                         sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
4576                 }
4577                 sb->s_time_min = EXT4_TIMESTAMP_MIN;
4578         }
4579         if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4580                 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4581                         EXT4_GOOD_OLD_INODE_SIZE;
4582                 if (ext4_has_feature_extra_isize(sb)) {
4583                         unsigned v, max = (sbi->s_inode_size -
4584                                            EXT4_GOOD_OLD_INODE_SIZE);
4585
4586                         v = le16_to_cpu(es->s_want_extra_isize);
4587                         if (v > max) {
4588                                 ext4_msg(sb, KERN_ERR,
4589                                          "bad s_want_extra_isize: %d", v);
4590                                 goto failed_mount;
4591                         }
4592                         if (sbi->s_want_extra_isize < v)
4593                                 sbi->s_want_extra_isize = v;
4594
4595                         v = le16_to_cpu(es->s_min_extra_isize);
4596                         if (v > max) {
4597                                 ext4_msg(sb, KERN_ERR,
4598                                          "bad s_min_extra_isize: %d", v);
4599                                 goto failed_mount;
4600                         }
4601                         if (sbi->s_want_extra_isize < v)
4602                                 sbi->s_want_extra_isize = v;
4603                 }
4604         }
4605
4606         err = parse_apply_sb_mount_options(sb, ctx);
4607         if (err < 0)
4608                 goto failed_mount;
4609
4610         sbi->s_def_mount_opt = sbi->s_mount_opt;
4611
4612         err = ext4_check_opt_consistency(fc, sb);
4613         if (err < 0)
4614                 goto failed_mount;
4615
4616         err = ext4_apply_options(fc, sb);
4617         if (err < 0)
4618                 goto failed_mount;
4619
4620 #ifdef CONFIG_UNICODE
4621         if (ext4_has_feature_casefold(sb) && !sb->s_encoding) {
4622                 const struct ext4_sb_encodings *encoding_info;
4623                 struct unicode_map *encoding;
4624                 __u16 encoding_flags;
4625
4626                 if (ext4_sb_read_encoding(es, &encoding_info,
4627                                           &encoding_flags)) {
4628                         ext4_msg(sb, KERN_ERR,
4629                                  "Encoding requested by superblock is unknown");
4630                         goto failed_mount;
4631                 }
4632
4633                 encoding = utf8_load(encoding_info->version);
4634                 if (IS_ERR(encoding)) {
4635                         ext4_msg(sb, KERN_ERR,
4636                                  "can't mount with superblock charset: %s-%s "
4637                                  "not supported by the kernel. flags: 0x%x.",
4638                                  encoding_info->name, encoding_info->version,
4639                                  encoding_flags);
4640                         goto failed_mount;
4641                 }
4642                 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
4643                          "%s-%s with flags 0x%hx", encoding_info->name,
4644                          encoding_info->version?:"\b", encoding_flags);
4645
4646                 sb->s_encoding = encoding;
4647                 sb->s_encoding_flags = encoding_flags;
4648         }
4649 #endif
4650
4651         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4652                 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, O_DIRECT and fast_commit support!\n");
4653                 /* can't mount with both data=journal and dioread_nolock. */
4654                 clear_opt(sb, DIOREAD_NOLOCK);
4655                 clear_opt2(sb, JOURNAL_FAST_COMMIT);
4656                 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4657                         ext4_msg(sb, KERN_ERR, "can't mount with "
4658                                  "both data=journal and delalloc");
4659                         goto failed_mount;
4660                 }
4661                 if (test_opt(sb, DAX_ALWAYS)) {
4662                         ext4_msg(sb, KERN_ERR, "can't mount with "
4663                                  "both data=journal and dax");
4664                         goto failed_mount;
4665                 }
4666                 if (ext4_has_feature_encrypt(sb)) {
4667                         ext4_msg(sb, KERN_WARNING,
4668                                  "encrypted files will use data=ordered "
4669                                  "instead of data journaling mode");
4670                 }
4671                 if (test_opt(sb, DELALLOC))
4672                         clear_opt(sb, DELALLOC);
4673         } else {
4674                 sb->s_iflags |= SB_I_CGROUPWB;
4675         }
4676
4677         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
4678                 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
4679
4680         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
4681             (ext4_has_compat_features(sb) ||
4682              ext4_has_ro_compat_features(sb) ||
4683              ext4_has_incompat_features(sb)))
4684                 ext4_msg(sb, KERN_WARNING,
4685                        "feature flags set on rev 0 fs, "
4686                        "running e2fsck is recommended");
4687
4688         if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
4689                 set_opt2(sb, HURD_COMPAT);
4690                 if (ext4_has_feature_64bit(sb)) {
4691                         ext4_msg(sb, KERN_ERR,
4692                                  "The Hurd can't support 64-bit file systems");
4693                         goto failed_mount;
4694                 }
4695
4696                 /*
4697                  * ea_inode feature uses l_i_version field which is not
4698                  * available in HURD_COMPAT mode.
4699                  */
4700                 if (ext4_has_feature_ea_inode(sb)) {
4701                         ext4_msg(sb, KERN_ERR,
4702                                  "ea_inode feature is not supported for Hurd");
4703                         goto failed_mount;
4704                 }
4705         }
4706
4707         if (IS_EXT2_SB(sb)) {
4708                 if (ext2_feature_set_ok(sb))
4709                         ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
4710                                  "using the ext4 subsystem");
4711                 else {
4712                         /*
4713                          * If we're probing be silent, if this looks like
4714                          * it's actually an ext[34] filesystem.
4715                          */
4716                         if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4717                                 goto failed_mount;
4718                         ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
4719                                  "to feature incompatibilities");
4720                         goto failed_mount;
4721                 }
4722         }
4723
4724         if (IS_EXT3_SB(sb)) {
4725                 if (ext3_feature_set_ok(sb))
4726                         ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
4727                                  "using the ext4 subsystem");
4728                 else {
4729                         /*
4730                          * If we're probing be silent, if this looks like
4731                          * it's actually an ext4 filesystem.
4732                          */
4733                         if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4734                                 goto failed_mount;
4735                         ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
4736                                  "to feature incompatibilities");
4737                         goto failed_mount;
4738                 }
4739         }
4740
4741         /*
4742          * Check feature flags regardless of the revision level, since we
4743          * previously didn't change the revision level when setting the flags,
4744          * so there is a chance incompat flags are set on a rev 0 filesystem.
4745          */
4746         if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
4747                 goto failed_mount;
4748
4749         if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
4750                 ext4_msg(sb, KERN_ERR,
4751                          "Number of reserved GDT blocks insanely large: %d",
4752                          le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
4753                 goto failed_mount;
4754         }
4755
4756         if (dax_supported(sbi->s_daxdev, sb->s_bdev, blocksize, 0,
4757                         bdev_nr_sectors(sb->s_bdev)))
4758                 set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags);
4759
4760         if (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) {
4761                 if (ext4_has_feature_inline_data(sb)) {
4762                         ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
4763                                         " that may contain inline data");
4764                         goto failed_mount;
4765                 }
4766                 if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags)) {
4767                         ext4_msg(sb, KERN_ERR,
4768                                 "DAX unsupported by block device.");
4769                         goto failed_mount;
4770                 }
4771         }
4772
4773         if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
4774                 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
4775                          es->s_encryption_level);
4776                 goto failed_mount;
4777         }
4778
4779         if (sb->s_blocksize != blocksize) {
4780                 /*
4781                  * bh must be released before kill_bdev(), otherwise
4782                  * it won't be freed and its page also. kill_bdev()
4783                  * is called by sb_set_blocksize().
4784                  */
4785                 brelse(bh);
4786                 /* Validate the filesystem blocksize */
4787                 if (!sb_set_blocksize(sb, blocksize)) {
4788                         ext4_msg(sb, KERN_ERR, "bad block size %d",
4789                                         blocksize);
4790                         bh = NULL;
4791                         goto failed_mount;
4792                 }
4793
4794                 logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE;
4795                 offset = do_div(logical_sb_block, blocksize);
4796                 bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
4797                 if (IS_ERR(bh)) {
4798                         ext4_msg(sb, KERN_ERR,
4799                                "Can't read superblock on 2nd try");
4800                         ret = PTR_ERR(bh);
4801                         bh = NULL;
4802                         goto failed_mount;
4803                 }
4804                 es = (struct ext4_super_block *)(bh->b_data + offset);
4805                 sbi->s_es = es;
4806                 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
4807                         ext4_msg(sb, KERN_ERR,
4808                                "Magic mismatch, very weird!");
4809                         goto failed_mount;
4810                 }
4811         }
4812
4813         has_huge_files = ext4_has_feature_huge_file(sb);
4814         sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
4815                                                       has_huge_files);
4816         sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
4817
4818         sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
4819         if (ext4_has_feature_64bit(sb)) {
4820                 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
4821                     sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
4822                     !is_power_of_2(sbi->s_desc_size)) {
4823                         ext4_msg(sb, KERN_ERR,
4824                                "unsupported descriptor size %lu",
4825                                sbi->s_desc_size);
4826                         goto failed_mount;
4827                 }
4828         } else
4829                 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
4830
4831         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
4832         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
4833
4834         sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
4835         if (sbi->s_inodes_per_block == 0)
4836                 goto cantfind_ext4;
4837         if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
4838             sbi->s_inodes_per_group > blocksize * 8) {
4839                 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
4840                          sbi->s_inodes_per_group);
4841                 goto failed_mount;
4842         }
4843         sbi->s_itb_per_group = sbi->s_inodes_per_group /
4844                                         sbi->s_inodes_per_block;
4845         sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
4846         sbi->s_sbh = bh;
4847         sbi->s_mount_state = le16_to_cpu(es->s_state);
4848         sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
4849         sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
4850
4851         for (i = 0; i < 4; i++)
4852                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
4853         sbi->s_def_hash_version = es->s_def_hash_version;
4854         if (ext4_has_feature_dir_index(sb)) {
4855                 i = le32_to_cpu(es->s_flags);
4856                 if (i & EXT2_FLAGS_UNSIGNED_HASH)
4857                         sbi->s_hash_unsigned = 3;
4858                 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
4859 #ifdef __CHAR_UNSIGNED__
4860                         if (!sb_rdonly(sb))
4861                                 es->s_flags |=
4862                                         cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
4863                         sbi->s_hash_unsigned = 3;
4864 #else
4865                         if (!sb_rdonly(sb))
4866                                 es->s_flags |=
4867                                         cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
4868 #endif
4869                 }
4870         }
4871
4872         /* Handle clustersize */
4873         clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
4874         if (ext4_has_feature_bigalloc(sb)) {
4875                 if (clustersize < blocksize) {
4876                         ext4_msg(sb, KERN_ERR,
4877                                  "cluster size (%d) smaller than "
4878                                  "block size (%d)", clustersize, blocksize);
4879                         goto failed_mount;
4880                 }
4881                 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4882                         le32_to_cpu(es->s_log_block_size);
4883                 sbi->s_clusters_per_group =
4884                         le32_to_cpu(es->s_clusters_per_group);
4885                 if (sbi->s_clusters_per_group > blocksize * 8) {
4886                         ext4_msg(sb, KERN_ERR,
4887                                  "#clusters per group too big: %lu",
4888                                  sbi->s_clusters_per_group);
4889                         goto failed_mount;
4890                 }
4891                 if (sbi->s_blocks_per_group !=
4892                     (sbi->s_clusters_per_group * (clustersize / blocksize))) {
4893                         ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4894                                  "clusters per group (%lu) inconsistent",
4895                                  sbi->s_blocks_per_group,
4896                                  sbi->s_clusters_per_group);
4897                         goto failed_mount;
4898                 }
4899         } else {
4900                 if (clustersize != blocksize) {
4901                         ext4_msg(sb, KERN_ERR,
4902                                  "fragment/cluster size (%d) != "
4903                                  "block size (%d)", clustersize, blocksize);
4904                         goto failed_mount;
4905                 }
4906                 if (sbi->s_blocks_per_group > blocksize * 8) {
4907                         ext4_msg(sb, KERN_ERR,
4908                                  "#blocks per group too big: %lu",
4909                                  sbi->s_blocks_per_group);
4910                         goto failed_mount;
4911                 }
4912                 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4913                 sbi->s_cluster_bits = 0;
4914         }
4915         sbi->s_cluster_ratio = clustersize / blocksize;
4916
4917         /* Do we have standard group size of clustersize * 8 blocks ? */
4918         if (sbi->s_blocks_per_group == clustersize << 3)
4919                 set_opt2(sb, STD_GROUP_SIZE);
4920
4921         /*
4922          * Test whether we have more sectors than will fit in sector_t,
4923          * and whether the max offset is addressable by the page cache.
4924          */
4925         err = generic_check_addressable(sb->s_blocksize_bits,
4926                                         ext4_blocks_count(es));
4927         if (err) {
4928                 ext4_msg(sb, KERN_ERR, "filesystem"
4929                          " too large to mount safely on this system");
4930                 goto failed_mount;
4931         }
4932
4933         if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4934                 goto cantfind_ext4;
4935
4936         /* check blocks count against device size */
4937         blocks_count = sb_bdev_nr_blocks(sb);
4938         if (blocks_count && ext4_blocks_count(es) > blocks_count) {
4939                 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4940                        "exceeds size of device (%llu blocks)",
4941                        ext4_blocks_count(es), blocks_count);
4942                 goto failed_mount;
4943         }
4944
4945         /*
4946          * It makes no sense for the first data block to be beyond the end
4947          * of the filesystem.
4948          */
4949         if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
4950                 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4951                          "block %u is beyond end of filesystem (%llu)",
4952                          le32_to_cpu(es->s_first_data_block),
4953                          ext4_blocks_count(es));
4954                 goto failed_mount;
4955         }
4956         if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4957             (sbi->s_cluster_ratio == 1)) {
4958                 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4959                          "block is 0 with a 1k block and cluster size");
4960                 goto failed_mount;
4961         }
4962
4963         blocks_count = (ext4_blocks_count(es) -
4964                         le32_to_cpu(es->s_first_data_block) +
4965                         EXT4_BLOCKS_PER_GROUP(sb) - 1);
4966         do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4967         if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
4968                 ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
4969                        "(block count %llu, first data block %u, "
4970                        "blocks per group %lu)", blocks_count,
4971                        ext4_blocks_count(es),
4972                        le32_to_cpu(es->s_first_data_block),
4973                        EXT4_BLOCKS_PER_GROUP(sb));
4974                 goto failed_mount;
4975         }
4976         sbi->s_groups_count = blocks_count;
4977         sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4978                         (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
4979         if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4980             le32_to_cpu(es->s_inodes_count)) {
4981                 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4982                          le32_to_cpu(es->s_inodes_count),
4983                          ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4984                 ret = -EINVAL;
4985                 goto failed_mount;
4986         }
4987         db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4988                    EXT4_DESC_PER_BLOCK(sb);
4989         if (ext4_has_feature_meta_bg(sb)) {
4990                 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
4991                         ext4_msg(sb, KERN_WARNING,
4992                                  "first meta block group too large: %u "
4993                                  "(group descriptor block count %u)",
4994                                  le32_to_cpu(es->s_first_meta_bg), db_count);
4995                         goto failed_mount;
4996                 }
4997         }
4998         rcu_assign_pointer(sbi->s_group_desc,
4999                            kvmalloc_array(db_count,
5000                                           sizeof(struct buffer_head *),
5001                                           GFP_KERNEL));
5002         if (sbi->s_group_desc == NULL) {
5003                 ext4_msg(sb, KERN_ERR, "not enough memory");
5004                 ret = -ENOMEM;
5005                 goto failed_mount;
5006         }
5007
5008         bgl_lock_init(sbi->s_blockgroup_lock);
5009
5010         /* Pre-read the descriptors into the buffer cache */
5011         for (i = 0; i < db_count; i++) {
5012                 block = descriptor_loc(sb, logical_sb_block, i);
5013                 ext4_sb_breadahead_unmovable(sb, block);
5014         }
5015
5016         for (i = 0; i < db_count; i++) {
5017                 struct buffer_head *bh;
5018
5019                 block = descriptor_loc(sb, logical_sb_block, i);
5020                 bh = ext4_sb_bread_unmovable(sb, block);
5021                 if (IS_ERR(bh)) {
5022                         ext4_msg(sb, KERN_ERR,
5023                                "can't read group descriptor %d", i);
5024                         db_count = i;
5025                         ret = PTR_ERR(bh);
5026                         goto failed_mount2;
5027                 }
5028                 rcu_read_lock();
5029                 rcu_dereference(sbi->s_group_desc)[i] = bh;
5030                 rcu_read_unlock();
5031         }
5032         sbi->s_gdb_count = db_count;
5033         if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
5034                 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
5035                 ret = -EFSCORRUPTED;
5036                 goto failed_mount2;
5037         }
5038
5039         timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
5040         spin_lock_init(&sbi->s_error_lock);
5041         INIT_WORK(&sbi->s_error_work, flush_stashed_error_work);
5042
5043         /* Register extent status tree shrinker */
5044         if (ext4_es_register_shrinker(sbi))
5045                 goto failed_mount3;
5046
5047         sbi->s_stripe = ext4_get_stripe_size(sbi);
5048         sbi->s_extent_max_zeroout_kb = 32;
5049
5050         /*
5051          * set up enough so that it can read an inode
5052          */
5053         sb->s_op = &ext4_sops;
5054         sb->s_export_op = &ext4_export_ops;
5055         sb->s_xattr = ext4_xattr_handlers;
5056 #ifdef CONFIG_FS_ENCRYPTION
5057         sb->s_cop = &ext4_cryptops;
5058 #endif
5059 #ifdef CONFIG_FS_VERITY
5060         sb->s_vop = &ext4_verityops;
5061 #endif
5062 #ifdef CONFIG_QUOTA
5063         sb->dq_op = &ext4_quota_operations;
5064         if (ext4_has_feature_quota(sb))
5065                 sb->s_qcop = &dquot_quotactl_sysfile_ops;
5066         else
5067                 sb->s_qcop = &ext4_qctl_operations;
5068         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
5069 #endif
5070         memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
5071
5072         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
5073         mutex_init(&sbi->s_orphan_lock);
5074
5075         /* Initialize fast commit stuff */
5076         atomic_set(&sbi->s_fc_subtid, 0);
5077         INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_MAIN]);
5078         INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_STAGING]);
5079         INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_MAIN]);
5080         INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_STAGING]);
5081         sbi->s_fc_bytes = 0;
5082         ext4_clear_mount_flag(sb, EXT4_MF_FC_INELIGIBLE);
5083         ext4_clear_mount_flag(sb, EXT4_MF_FC_COMMITTING);
5084         spin_lock_init(&sbi->s_fc_lock);
5085         memset(&sbi->s_fc_stats, 0, sizeof(sbi->s_fc_stats));
5086         sbi->s_fc_replay_state.fc_regions = NULL;
5087         sbi->s_fc_replay_state.fc_regions_size = 0;
5088         sbi->s_fc_replay_state.fc_regions_used = 0;
5089         sbi->s_fc_replay_state.fc_regions_valid = 0;
5090         sbi->s_fc_replay_state.fc_modified_inodes = NULL;
5091         sbi->s_fc_replay_state.fc_modified_inodes_size = 0;
5092         sbi->s_fc_replay_state.fc_modified_inodes_used = 0;
5093
5094         sb->s_root = NULL;
5095
5096         needs_recovery = (es->s_last_orphan != 0 ||
5097                           ext4_has_feature_orphan_present(sb) ||
5098                           ext4_has_feature_journal_needs_recovery(sb));
5099
5100         if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
5101                 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
5102                         goto failed_mount3a;
5103
5104         /*
5105          * The first inode we look at is the journal inode.  Don't try
5106          * root first: it may be modified in the journal!
5107          */
5108         if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
5109                 err = ext4_load_journal(sb, es, ctx->journal_devnum);
5110                 if (err)
5111                         goto failed_mount3a;
5112         } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
5113                    ext4_has_feature_journal_needs_recovery(sb)) {
5114                 ext4_msg(sb, KERN_ERR, "required journal recovery "
5115                        "suppressed and not mounted read-only");
5116                 goto failed_mount_wq;
5117         } else {
5118                 /* Nojournal mode, all journal mount options are illegal */
5119                 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
5120                         ext4_msg(sb, KERN_ERR, "can't mount with "
5121                                  "journal_checksum, fs mounted w/o journal");
5122                         goto failed_mount_wq;
5123                 }
5124                 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5125                         ext4_msg(sb, KERN_ERR, "can't mount with "
5126                                  "journal_async_commit, fs mounted w/o journal");
5127                         goto failed_mount_wq;
5128                 }
5129                 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
5130                         ext4_msg(sb, KERN_ERR, "can't mount with "
5131                                  "commit=%lu, fs mounted w/o journal",
5132                                  sbi->s_commit_interval / HZ);
5133                         goto failed_mount_wq;
5134                 }
5135                 if (EXT4_MOUNT_DATA_FLAGS &
5136                     (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
5137                         ext4_msg(sb, KERN_ERR, "can't mount with "
5138                                  "data=, fs mounted w/o journal");
5139                         goto failed_mount_wq;
5140                 }
5141                 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
5142                 clear_opt(sb, JOURNAL_CHECKSUM);
5143                 clear_opt(sb, DATA_FLAGS);
5144                 clear_opt2(sb, JOURNAL_FAST_COMMIT);
5145                 sbi->s_journal = NULL;
5146                 needs_recovery = 0;
5147                 goto no_journal;
5148         }
5149
5150         if (ext4_has_feature_64bit(sb) &&
5151             !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
5152                                        JBD2_FEATURE_INCOMPAT_64BIT)) {
5153                 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
5154                 goto failed_mount_wq;
5155         }
5156
5157         if (!set_journal_csum_feature_set(sb)) {
5158                 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
5159                          "feature set");
5160                 goto failed_mount_wq;
5161         }
5162
5163         if (test_opt2(sb, JOURNAL_FAST_COMMIT) &&
5164                 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
5165                                           JBD2_FEATURE_INCOMPAT_FAST_COMMIT)) {
5166                 ext4_msg(sb, KERN_ERR,
5167                         "Failed to set fast commit journal feature");
5168                 goto failed_mount_wq;
5169         }
5170
5171         /* We have now updated the journal if required, so we can
5172          * validate the data journaling mode. */
5173         switch (test_opt(sb, DATA_FLAGS)) {
5174         case 0:
5175                 /* No mode set, assume a default based on the journal
5176                  * capabilities: ORDERED_DATA if the journal can
5177                  * cope, else JOURNAL_DATA
5178                  */
5179                 if (jbd2_journal_check_available_features
5180                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
5181                         set_opt(sb, ORDERED_DATA);
5182                         sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
5183                 } else {
5184                         set_opt(sb, JOURNAL_DATA);
5185                         sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
5186                 }
5187                 break;
5188
5189         case EXT4_MOUNT_ORDERED_DATA:
5190         case EXT4_MOUNT_WRITEBACK_DATA:
5191                 if (!jbd2_journal_check_available_features
5192                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
5193                         ext4_msg(sb, KERN_ERR, "Journal does not support "
5194                                "requested data journaling mode");
5195                         goto failed_mount_wq;
5196                 }
5197                 break;
5198         default:
5199                 break;
5200         }
5201
5202         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
5203             test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5204                 ext4_msg(sb, KERN_ERR, "can't mount with "
5205                         "journal_async_commit in data=ordered mode");
5206                 goto failed_mount_wq;
5207         }
5208
5209         set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio);
5210
5211         sbi->s_journal->j_submit_inode_data_buffers =
5212                 ext4_journal_submit_inode_data_buffers;
5213         sbi->s_journal->j_finish_inode_data_buffers =
5214                 ext4_journal_finish_inode_data_buffers;
5215
5216 no_journal:
5217         if (!test_opt(sb, NO_MBCACHE)) {
5218                 sbi->s_ea_block_cache = ext4_xattr_create_cache();
5219                 if (!sbi->s_ea_block_cache) {
5220                         ext4_msg(sb, KERN_ERR,
5221                                  "Failed to create ea_block_cache");
5222                         goto failed_mount_wq;
5223                 }
5224
5225                 if (ext4_has_feature_ea_inode(sb)) {
5226                         sbi->s_ea_inode_cache = ext4_xattr_create_cache();
5227                         if (!sbi->s_ea_inode_cache) {
5228                                 ext4_msg(sb, KERN_ERR,
5229                                          "Failed to create ea_inode_cache");
5230                                 goto failed_mount_wq;
5231                         }
5232                 }
5233         }
5234
5235         if (ext4_has_feature_verity(sb) && blocksize != PAGE_SIZE) {
5236                 ext4_msg(sb, KERN_ERR, "Unsupported blocksize for fs-verity");
5237                 goto failed_mount_wq;
5238         }
5239
5240         if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
5241             !ext4_has_feature_encrypt(sb)) {
5242                 ext4_set_feature_encrypt(sb);
5243                 ext4_commit_super(sb);
5244         }
5245
5246         /*
5247          * Get the # of file system overhead blocks from the
5248          * superblock if present.
5249          */
5250         if (es->s_overhead_clusters)
5251                 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
5252         else {
5253                 err = ext4_calculate_overhead(sb);
5254                 if (err)
5255                         goto failed_mount_wq;
5256         }
5257
5258         /*
5259          * The maximum number of concurrent works can be high and
5260          * concurrency isn't really necessary.  Limit it to 1.
5261          */
5262         EXT4_SB(sb)->rsv_conversion_wq =
5263                 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
5264         if (!EXT4_SB(sb)->rsv_conversion_wq) {
5265                 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
5266                 ret = -ENOMEM;
5267                 goto failed_mount4;
5268         }
5269
5270         /*
5271          * The jbd2_journal_load will have done any necessary log recovery,
5272          * so we can safely mount the rest of the filesystem now.
5273          */
5274
5275         root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
5276         if (IS_ERR(root)) {
5277                 ext4_msg(sb, KERN_ERR, "get root inode failed");
5278                 ret = PTR_ERR(root);
5279                 root = NULL;
5280                 goto failed_mount4;
5281         }
5282         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
5283                 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
5284                 iput(root);
5285                 goto failed_mount4;
5286         }
5287
5288         sb->s_root = d_make_root(root);
5289         if (!sb->s_root) {
5290                 ext4_msg(sb, KERN_ERR, "get root dentry failed");
5291                 ret = -ENOMEM;
5292                 goto failed_mount4;
5293         }
5294
5295         ret = ext4_setup_super(sb, es, sb_rdonly(sb));
5296         if (ret == -EROFS) {
5297                 sb->s_flags |= SB_RDONLY;
5298                 ret = 0;
5299         } else if (ret)
5300                 goto failed_mount4a;
5301
5302         ext4_set_resv_clusters(sb);
5303
5304         if (test_opt(sb, BLOCK_VALIDITY)) {
5305                 err = ext4_setup_system_zone(sb);
5306                 if (err) {
5307                         ext4_msg(sb, KERN_ERR, "failed to initialize system "
5308                                  "zone (%d)", err);
5309                         goto failed_mount4a;
5310                 }
5311         }
5312         ext4_fc_replay_cleanup(sb);
5313
5314         ext4_ext_init(sb);
5315
5316         /*
5317          * Enable optimize_scan if number of groups is > threshold. This can be
5318          * turned off by passing "mb_optimize_scan=0". This can also be
5319          * turned on forcefully by passing "mb_optimize_scan=1".
5320          */
5321         if (ctx->mb_optimize_scan == 1)
5322                 set_opt2(sb, MB_OPTIMIZE_SCAN);
5323         else if (ctx->mb_optimize_scan == 0)
5324                 clear_opt2(sb, MB_OPTIMIZE_SCAN);
5325         else if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD)
5326                 set_opt2(sb, MB_OPTIMIZE_SCAN);
5327
5328         err = ext4_mb_init(sb);
5329         if (err) {
5330                 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
5331                          err);
5332                 goto failed_mount5;
5333         }
5334
5335         /*
5336          * We can only set up the journal commit callback once
5337          * mballoc is initialized
5338          */
5339         if (sbi->s_journal)
5340                 sbi->s_journal->j_commit_callback =
5341                         ext4_journal_commit_callback;
5342
5343         block = ext4_count_free_clusters(sb);
5344         ext4_free_blocks_count_set(sbi->s_es,
5345                                    EXT4_C2B(sbi, block));
5346         err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
5347                                   GFP_KERNEL);
5348         if (!err) {
5349                 unsigned long freei = ext4_count_free_inodes(sb);
5350                 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
5351                 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
5352                                           GFP_KERNEL);
5353         }
5354         /*
5355          * Update the checksum after updating free space/inode
5356          * counters.  Otherwise the superblock can have an incorrect
5357          * checksum in the buffer cache until it is written out and
5358          * e2fsprogs programs trying to open a file system immediately
5359          * after it is mounted can fail.
5360          */
5361         ext4_superblock_csum_set(sb);
5362         if (!err)
5363                 err = percpu_counter_init(&sbi->s_dirs_counter,
5364                                           ext4_count_dirs(sb), GFP_KERNEL);
5365         if (!err)
5366                 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
5367                                           GFP_KERNEL);
5368         if (!err)
5369                 err = percpu_counter_init(&sbi->s_sra_exceeded_retry_limit, 0,
5370                                           GFP_KERNEL);
5371         if (!err)
5372                 err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
5373
5374         if (err) {
5375                 ext4_msg(sb, KERN_ERR, "insufficient memory");
5376                 goto failed_mount6;
5377         }
5378
5379         if (ext4_has_feature_flex_bg(sb))
5380                 if (!ext4_fill_flex_info(sb)) {
5381                         ext4_msg(sb, KERN_ERR,
5382                                "unable to initialize "
5383                                "flex_bg meta info!");
5384                         ret = -ENOMEM;
5385                         goto failed_mount6;
5386                 }
5387
5388         err = ext4_register_li_request(sb, first_not_zeroed);
5389         if (err)
5390                 goto failed_mount6;
5391
5392         err = ext4_register_sysfs(sb);
5393         if (err)
5394                 goto failed_mount7;
5395
5396         err = ext4_init_orphan_info(sb);
5397         if (err)
5398                 goto failed_mount8;
5399 #ifdef CONFIG_QUOTA
5400         /* Enable quota usage during mount. */
5401         if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
5402                 err = ext4_enable_quotas(sb);
5403                 if (err)
5404                         goto failed_mount9;
5405         }
5406 #endif  /* CONFIG_QUOTA */
5407
5408         /*
5409          * Save the original bdev mapping's wb_err value which could be
5410          * used to detect the metadata async write error.
5411          */
5412         spin_lock_init(&sbi->s_bdev_wb_lock);
5413         errseq_check_and_advance(&sb->s_bdev->bd_inode->i_mapping->wb_err,
5414                                  &sbi->s_bdev_wb_err);
5415         sb->s_bdev->bd_super = sb;
5416         EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
5417         ext4_orphan_cleanup(sb, es);
5418         EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
5419         if (needs_recovery) {
5420                 ext4_msg(sb, KERN_INFO, "recovery complete");
5421                 err = ext4_mark_recovery_complete(sb, es);
5422                 if (err)
5423                         goto failed_mount9;
5424         }
5425
5426         if (test_opt(sb, DISCARD)) {
5427                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
5428                 if (!blk_queue_discard(q))
5429                         ext4_msg(sb, KERN_WARNING,
5430                                  "mounting with \"discard\" option, but "
5431                                  "the device does not support discard");
5432         }
5433
5434         if (es->s_error_count)
5435                 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
5436
5437         /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
5438         ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
5439         ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
5440         ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
5441         atomic_set(&sbi->s_warning_count, 0);
5442         atomic_set(&sbi->s_msg_count, 0);
5443
5444         return 0;
5445
5446 cantfind_ext4:
5447         if (!silent)
5448                 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
5449         goto failed_mount;
5450
5451 failed_mount9:
5452         ext4_release_orphan_info(sb);
5453 failed_mount8:
5454         ext4_unregister_sysfs(sb);
5455         kobject_put(&sbi->s_kobj);
5456 failed_mount7:
5457         ext4_unregister_li_request(sb);
5458 failed_mount6:
5459         ext4_mb_release(sb);
5460         rcu_read_lock();
5461         flex_groups = rcu_dereference(sbi->s_flex_groups);
5462         if (flex_groups) {
5463                 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
5464                         kvfree(flex_groups[i]);
5465                 kvfree(flex_groups);
5466         }
5467         rcu_read_unlock();
5468         percpu_counter_destroy(&sbi->s_freeclusters_counter);
5469         percpu_counter_destroy(&sbi->s_freeinodes_counter);
5470         percpu_counter_destroy(&sbi->s_dirs_counter);
5471         percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
5472         percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit);
5473         percpu_free_rwsem(&sbi->s_writepages_rwsem);
5474 failed_mount5:
5475         ext4_ext_release(sb);
5476         ext4_release_system_zone(sb);
5477 failed_mount4a:
5478         dput(sb->s_root);
5479         sb->s_root = NULL;
5480 failed_mount4:
5481         ext4_msg(sb, KERN_ERR, "mount failed");
5482         if (EXT4_SB(sb)->rsv_conversion_wq)
5483                 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
5484 failed_mount_wq:
5485         ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
5486         sbi->s_ea_inode_cache = NULL;
5487
5488         ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
5489         sbi->s_ea_block_cache = NULL;
5490
5491         if (sbi->s_journal) {
5492                 /* flush s_error_work before journal destroy. */
5493                 flush_work(&sbi->s_error_work);
5494                 jbd2_journal_destroy(sbi->s_journal);
5495                 sbi->s_journal = NULL;
5496         }
5497 failed_mount3a:
5498         ext4_es_unregister_shrinker(sbi);
5499 failed_mount3:
5500         /* flush s_error_work before sbi destroy */
5501         flush_work(&sbi->s_error_work);
5502         del_timer_sync(&sbi->s_err_report);
5503         ext4_stop_mmpd(sbi);
5504 failed_mount2:
5505         rcu_read_lock();
5506         group_desc = rcu_dereference(sbi->s_group_desc);
5507         for (i = 0; i < db_count; i++)
5508                 brelse(group_desc[i]);
5509         kvfree(group_desc);
5510         rcu_read_unlock();
5511 failed_mount:
5512         if (sbi->s_chksum_driver)
5513                 crypto_free_shash(sbi->s_chksum_driver);
5514
5515 #ifdef CONFIG_UNICODE
5516         utf8_unload(sb->s_encoding);
5517 #endif
5518
5519 #ifdef CONFIG_QUOTA
5520         for (i = 0; i < EXT4_MAXQUOTAS; i++)
5521                 kfree(get_qf_name(sb, sbi, i));
5522 #endif
5523         fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
5524         /* ext4_blkdev_remove() calls kill_bdev(), release bh before it. */
5525         brelse(bh);
5526         ext4_blkdev_remove(sbi);
5527 out_fail:
5528         sb->s_fs_info = NULL;
5529         return err ? err : ret;
5530 }
5531
5532 static int ext4_fill_super(struct super_block *sb, struct fs_context *fc)
5533 {
5534         struct ext4_fs_context *ctx = fc->fs_private;
5535         struct ext4_sb_info *sbi;
5536         const char *descr;
5537         int ret;
5538
5539         sbi = ext4_alloc_sbi(sb);
5540         if (!sbi)
5541                 ret = -ENOMEM;
5542
5543         fc->s_fs_info = sbi;
5544
5545         /* Cleanup superblock name */
5546         strreplace(sb->s_id, '/', '!');
5547
5548         sbi->s_sb_block = 1;    /* Default super block location */
5549         if (ctx->spec & EXT4_SPEC_s_sb_block)
5550                 sbi->s_sb_block = ctx->s_sb_block;
5551
5552         ret = __ext4_fill_super(fc, sb);
5553         if (ret < 0)
5554                 goto free_sbi;
5555
5556         if (sbi->s_journal) {
5557                 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
5558                         descr = " journalled data mode";
5559                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
5560                         descr = " ordered data mode";
5561                 else
5562                         descr = " writeback data mode";
5563         } else
5564                 descr = "out journal";
5565
5566         if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
5567                 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
5568                          "Quota mode: %s.", descr, ext4_quota_mode(sb));
5569
5570         return 0;
5571
5572 free_sbi:
5573         ext4_free_sbi(sbi);
5574         fc->s_fs_info = NULL;
5575         return ret;
5576 }
5577
5578 static int ext4_get_tree(struct fs_context *fc)
5579 {
5580         return get_tree_bdev(fc, ext4_fill_super);
5581 }
5582
5583 /*
5584  * Setup any per-fs journal parameters now.  We'll do this both on
5585  * initial mount, once the journal has been initialised but before we've
5586  * done any recovery; and again on any subsequent remount.
5587  */
5588 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
5589 {
5590         struct ext4_sb_info *sbi = EXT4_SB(sb);
5591
5592         journal->j_commit_interval = sbi->s_commit_interval;
5593         journal->j_min_batch_time = sbi->s_min_batch_time;
5594         journal->j_max_batch_time = sbi->s_max_batch_time;
5595         ext4_fc_init(sb, journal);
5596
5597         write_lock(&journal->j_state_lock);
5598         if (test_opt(sb, BARRIER))
5599                 journal->j_flags |= JBD2_BARRIER;
5600         else
5601                 journal->j_flags &= ~JBD2_BARRIER;
5602         if (test_opt(sb, DATA_ERR_ABORT))
5603                 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
5604         else
5605                 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
5606         write_unlock(&journal->j_state_lock);
5607 }
5608
5609 static struct inode *ext4_get_journal_inode(struct super_block *sb,
5610                                              unsigned int journal_inum)
5611 {
5612         struct inode *journal_inode;
5613
5614         /*
5615          * Test for the existence of a valid inode on disk.  Bad things
5616          * happen if we iget() an unused inode, as the subsequent iput()
5617          * will try to delete it.
5618          */
5619         journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
5620         if (IS_ERR(journal_inode)) {
5621                 ext4_msg(sb, KERN_ERR, "no journal found");
5622                 return NULL;
5623         }
5624         if (!journal_inode->i_nlink) {
5625                 make_bad_inode(journal_inode);
5626                 iput(journal_inode);
5627                 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
5628                 return NULL;
5629         }
5630
5631         jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
5632                   journal_inode, journal_inode->i_size);
5633         if (!S_ISREG(journal_inode->i_mode)) {
5634                 ext4_msg(sb, KERN_ERR, "invalid journal inode");
5635                 iput(journal_inode);
5636                 return NULL;
5637         }
5638         return journal_inode;
5639 }
5640
5641 static journal_t *ext4_get_journal(struct super_block *sb,
5642                                    unsigned int journal_inum)
5643 {
5644         struct inode *journal_inode;
5645         journal_t *journal;
5646
5647         if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5648                 return NULL;
5649
5650         journal_inode = ext4_get_journal_inode(sb, journal_inum);
5651         if (!journal_inode)
5652                 return NULL;
5653
5654         journal = jbd2_journal_init_inode(journal_inode);
5655         if (!journal) {
5656                 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
5657                 iput(journal_inode);
5658                 return NULL;
5659         }
5660         journal->j_private = sb;
5661         ext4_init_journal_params(sb, journal);
5662         return journal;
5663 }
5664
5665 static journal_t *ext4_get_dev_journal(struct super_block *sb,
5666                                        dev_t j_dev)
5667 {
5668         struct buffer_head *bh;
5669         journal_t *journal;
5670         ext4_fsblk_t start;
5671         ext4_fsblk_t len;
5672         int hblock, blocksize;
5673         ext4_fsblk_t sb_block;
5674         unsigned long offset;
5675         struct ext4_super_block *es;
5676         struct block_device *bdev;
5677
5678         if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5679                 return NULL;
5680
5681         bdev = ext4_blkdev_get(j_dev, sb);
5682         if (bdev == NULL)
5683                 return NULL;
5684
5685         blocksize = sb->s_blocksize;
5686         hblock = bdev_logical_block_size(bdev);
5687         if (blocksize < hblock) {
5688                 ext4_msg(sb, KERN_ERR,
5689                         "blocksize too small for journal device");
5690                 goto out_bdev;
5691         }
5692
5693         sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
5694         offset = EXT4_MIN_BLOCK_SIZE % blocksize;
5695         set_blocksize(bdev, blocksize);
5696         if (!(bh = __bread(bdev, sb_block, blocksize))) {
5697                 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
5698                        "external journal");
5699                 goto out_bdev;
5700         }
5701
5702         es = (struct ext4_super_block *) (bh->b_data + offset);
5703         if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
5704             !(le32_to_cpu(es->s_feature_incompat) &
5705               EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
5706                 ext4_msg(sb, KERN_ERR, "external journal has "
5707                                         "bad superblock");
5708                 brelse(bh);
5709                 goto out_bdev;
5710         }
5711
5712         if ((le32_to_cpu(es->s_feature_ro_compat) &
5713              EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
5714             es->s_checksum != ext4_superblock_csum(sb, es)) {
5715                 ext4_msg(sb, KERN_ERR, "external journal has "
5716                                        "corrupt superblock");
5717                 brelse(bh);
5718                 goto out_bdev;
5719         }
5720
5721         if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
5722                 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
5723                 brelse(bh);
5724                 goto out_bdev;
5725         }
5726
5727         len = ext4_blocks_count(es);
5728         start = sb_block + 1;
5729         brelse(bh);     /* we're done with the superblock */
5730
5731         journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
5732                                         start, len, blocksize);
5733         if (!journal) {
5734                 ext4_msg(sb, KERN_ERR, "failed to create device journal");
5735                 goto out_bdev;
5736         }
5737         journal->j_private = sb;
5738         if (ext4_read_bh_lock(journal->j_sb_buffer, REQ_META | REQ_PRIO, true)) {
5739                 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
5740                 goto out_journal;
5741         }
5742         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
5743                 ext4_msg(sb, KERN_ERR, "External journal has more than one "
5744                                         "user (unsupported) - %d",
5745                         be32_to_cpu(journal->j_superblock->s_nr_users));
5746                 goto out_journal;
5747         }
5748         EXT4_SB(sb)->s_journal_bdev = bdev;
5749         ext4_init_journal_params(sb, journal);
5750         return journal;
5751
5752 out_journal:
5753         jbd2_journal_destroy(journal);
5754 out_bdev:
5755         ext4_blkdev_put(bdev);
5756         return NULL;
5757 }
5758
5759 static int ext4_load_journal(struct super_block *sb,
5760                              struct ext4_super_block *es,
5761                              unsigned long journal_devnum)
5762 {
5763         journal_t *journal;
5764         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
5765         dev_t journal_dev;
5766         int err = 0;
5767         int really_read_only;
5768         int journal_dev_ro;
5769
5770         if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5771                 return -EFSCORRUPTED;
5772
5773         if (journal_devnum &&
5774             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
5775                 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
5776                         "numbers have changed");
5777                 journal_dev = new_decode_dev(journal_devnum);
5778         } else
5779                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
5780
5781         if (journal_inum && journal_dev) {
5782                 ext4_msg(sb, KERN_ERR,
5783                          "filesystem has both journal inode and journal device!");
5784                 return -EINVAL;
5785         }
5786
5787         if (journal_inum) {
5788                 journal = ext4_get_journal(sb, journal_inum);
5789                 if (!journal)
5790                         return -EINVAL;
5791         } else {
5792                 journal = ext4_get_dev_journal(sb, journal_dev);
5793                 if (!journal)
5794                         return -EINVAL;
5795         }
5796
5797         journal_dev_ro = bdev_read_only(journal->j_dev);
5798         really_read_only = bdev_read_only(sb->s_bdev) | journal_dev_ro;
5799
5800         if (journal_dev_ro && !sb_rdonly(sb)) {
5801                 ext4_msg(sb, KERN_ERR,
5802                          "journal device read-only, try mounting with '-o ro'");
5803                 err = -EROFS;
5804                 goto err_out;
5805         }
5806
5807         /*
5808          * Are we loading a blank journal or performing recovery after a
5809          * crash?  For recovery, we need to check in advance whether we
5810          * can get read-write access to the device.
5811          */
5812         if (ext4_has_feature_journal_needs_recovery(sb)) {
5813                 if (sb_rdonly(sb)) {
5814                         ext4_msg(sb, KERN_INFO, "INFO: recovery "
5815                                         "required on readonly filesystem");
5816                         if (really_read_only) {
5817                                 ext4_msg(sb, KERN_ERR, "write access "
5818                                         "unavailable, cannot proceed "
5819                                         "(try mounting with noload)");
5820                                 err = -EROFS;
5821                                 goto err_out;
5822                         }
5823                         ext4_msg(sb, KERN_INFO, "write access will "
5824                                "be enabled during recovery");
5825                 }
5826         }
5827
5828         if (!(journal->j_flags & JBD2_BARRIER))
5829                 ext4_msg(sb, KERN_INFO, "barriers disabled");
5830
5831         if (!ext4_has_feature_journal_needs_recovery(sb))
5832                 err = jbd2_journal_wipe(journal, !really_read_only);
5833         if (!err) {
5834                 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
5835                 if (save)
5836                         memcpy(save, ((char *) es) +
5837                                EXT4_S_ERR_START, EXT4_S_ERR_LEN);
5838                 err = jbd2_journal_load(journal);
5839                 if (save)
5840                         memcpy(((char *) es) + EXT4_S_ERR_START,
5841                                save, EXT4_S_ERR_LEN);
5842                 kfree(save);
5843         }
5844
5845         if (err) {
5846                 ext4_msg(sb, KERN_ERR, "error loading journal");
5847                 goto err_out;
5848         }
5849
5850         EXT4_SB(sb)->s_journal = journal;
5851         err = ext4_clear_journal_err(sb, es);
5852         if (err) {
5853                 EXT4_SB(sb)->s_journal = NULL;
5854                 jbd2_journal_destroy(journal);
5855                 return err;
5856         }
5857
5858         if (!really_read_only && journal_devnum &&
5859             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
5860                 es->s_journal_dev = cpu_to_le32(journal_devnum);
5861
5862                 /* Make sure we flush the recovery flag to disk. */
5863                 ext4_commit_super(sb);
5864         }
5865
5866         return 0;
5867
5868 err_out:
5869         jbd2_journal_destroy(journal);
5870         return err;
5871 }
5872
5873 /* Copy state of EXT4_SB(sb) into buffer for on-disk superblock */
5874 static void ext4_update_super(struct super_block *sb)
5875 {
5876         struct ext4_sb_info *sbi = EXT4_SB(sb);
5877         struct ext4_super_block *es = sbi->s_es;
5878         struct buffer_head *sbh = sbi->s_sbh;
5879
5880         lock_buffer(sbh);
5881         /*
5882          * If the file system is mounted read-only, don't update the
5883          * superblock write time.  This avoids updating the superblock
5884          * write time when we are mounting the root file system
5885          * read/only but we need to replay the journal; at that point,
5886          * for people who are east of GMT and who make their clock
5887          * tick in localtime for Windows bug-for-bug compatibility,
5888          * the clock is set in the future, and this will cause e2fsck
5889          * to complain and force a full file system check.
5890          */
5891         if (!(sb->s_flags & SB_RDONLY))
5892                 ext4_update_tstamp(es, s_wtime);
5893         es->s_kbytes_written =
5894                 cpu_to_le64(sbi->s_kbytes_written +
5895                     ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
5896                       sbi->s_sectors_written_start) >> 1));
5897         if (percpu_counter_initialized(&sbi->s_freeclusters_counter))
5898                 ext4_free_blocks_count_set(es,
5899                         EXT4_C2B(sbi, percpu_counter_sum_positive(
5900                                 &sbi->s_freeclusters_counter)));
5901         if (percpu_counter_initialized(&sbi->s_freeinodes_counter))
5902                 es->s_free_inodes_count =
5903                         cpu_to_le32(percpu_counter_sum_positive(
5904                                 &sbi->s_freeinodes_counter));
5905         /* Copy error information to the on-disk superblock */
5906         spin_lock(&sbi->s_error_lock);
5907         if (sbi->s_add_error_count > 0) {
5908                 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
5909                 if (!es->s_first_error_time && !es->s_first_error_time_hi) {
5910                         __ext4_update_tstamp(&es->s_first_error_time,
5911                                              &es->s_first_error_time_hi,
5912                                              sbi->s_first_error_time);
5913                         strncpy(es->s_first_error_func, sbi->s_first_error_func,
5914                                 sizeof(es->s_first_error_func));
5915                         es->s_first_error_line =
5916                                 cpu_to_le32(sbi->s_first_error_line);
5917                         es->s_first_error_ino =
5918                                 cpu_to_le32(sbi->s_first_error_ino);
5919                         es->s_first_error_block =
5920                                 cpu_to_le64(sbi->s_first_error_block);
5921                         es->s_first_error_errcode =
5922                                 ext4_errno_to_code(sbi->s_first_error_code);
5923                 }
5924                 __ext4_update_tstamp(&es->s_last_error_time,
5925                                      &es->s_last_error_time_hi,
5926                                      sbi->s_last_error_time);
5927                 strncpy(es->s_last_error_func, sbi->s_last_error_func,
5928                         sizeof(es->s_last_error_func));
5929                 es->s_last_error_line = cpu_to_le32(sbi->s_last_error_line);
5930                 es->s_last_error_ino = cpu_to_le32(sbi->s_last_error_ino);
5931                 es->s_last_error_block = cpu_to_le64(sbi->s_last_error_block);
5932                 es->s_last_error_errcode =
5933                                 ext4_errno_to_code(sbi->s_last_error_code);
5934                 /*
5935                  * Start the daily error reporting function if it hasn't been
5936                  * started already
5937                  */
5938                 if (!es->s_error_count)
5939                         mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);
5940                 le32_add_cpu(&es->s_error_count, sbi->s_add_error_count);
5941                 sbi->s_add_error_count = 0;
5942         }
5943         spin_unlock(&sbi->s_error_lock);
5944
5945         ext4_superblock_csum_set(sb);
5946         unlock_buffer(sbh);
5947 }
5948
5949 static int ext4_commit_super(struct super_block *sb)
5950 {
5951         struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
5952         int error = 0;
5953
5954         if (!sbh)
5955                 return -EINVAL;
5956         if (block_device_ejected(sb))
5957                 return -ENODEV;
5958
5959         ext4_update_super(sb);
5960
5961         if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
5962                 /*
5963                  * Oh, dear.  A previous attempt to write the
5964                  * superblock failed.  This could happen because the
5965                  * USB device was yanked out.  Or it could happen to
5966                  * be a transient write error and maybe the block will
5967                  * be remapped.  Nothing we can do but to retry the
5968                  * write and hope for the best.
5969                  */
5970                 ext4_msg(sb, KERN_ERR, "previous I/O error to "
5971                        "superblock detected");
5972                 clear_buffer_write_io_error(sbh);
5973                 set_buffer_uptodate(sbh);
5974         }
5975         BUFFER_TRACE(sbh, "marking dirty");
5976         mark_buffer_dirty(sbh);
5977         error = __sync_dirty_buffer(sbh,
5978                 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
5979         if (buffer_write_io_error(sbh)) {
5980                 ext4_msg(sb, KERN_ERR, "I/O error while writing "
5981                        "superblock");
5982                 clear_buffer_write_io_error(sbh);
5983                 set_buffer_uptodate(sbh);
5984         }
5985         return error;
5986 }
5987
5988 /*
5989  * Have we just finished recovery?  If so, and if we are mounting (or
5990  * remounting) the filesystem readonly, then we will end up with a
5991  * consistent fs on disk.  Record that fact.
5992  */
5993 static int ext4_mark_recovery_complete(struct super_block *sb,
5994                                        struct ext4_super_block *es)
5995 {
5996         int err;
5997         journal_t *journal = EXT4_SB(sb)->s_journal;
5998
5999         if (!ext4_has_feature_journal(sb)) {
6000                 if (journal != NULL) {
6001                         ext4_error(sb, "Journal got removed while the fs was "
6002                                    "mounted!");
6003                         return -EFSCORRUPTED;
6004                 }
6005                 return 0;
6006         }
6007         jbd2_journal_lock_updates(journal);
6008         err = jbd2_journal_flush(journal, 0);
6009         if (err < 0)
6010                 goto out;
6011
6012         if (sb_rdonly(sb) && (ext4_has_feature_journal_needs_recovery(sb) ||
6013             ext4_has_feature_orphan_present(sb))) {
6014                 if (!ext4_orphan_file_empty(sb)) {
6015                         ext4_error(sb, "Orphan file not empty on read-only fs.");
6016                         err = -EFSCORRUPTED;
6017                         goto out;
6018                 }
6019                 ext4_clear_feature_journal_needs_recovery(sb);
6020                 ext4_clear_feature_orphan_present(sb);
6021                 ext4_commit_super(sb);
6022         }
6023 out:
6024         jbd2_journal_unlock_updates(journal);
6025         return err;
6026 }
6027
6028 /*
6029  * If we are mounting (or read-write remounting) a filesystem whose journal
6030  * has recorded an error from a previous lifetime, move that error to the
6031  * main filesystem now.
6032  */
6033 static int ext4_clear_journal_err(struct super_block *sb,
6034                                    struct ext4_super_block *es)
6035 {
6036         journal_t *journal;
6037         int j_errno;
6038         const char *errstr;
6039
6040         if (!ext4_has_feature_journal(sb)) {
6041                 ext4_error(sb, "Journal got removed while the fs was mounted!");
6042                 return -EFSCORRUPTED;
6043         }
6044
6045         journal = EXT4_SB(sb)->s_journal;
6046
6047         /*
6048          * Now check for any error status which may have been recorded in the
6049          * journal by a prior ext4_error() or ext4_abort()
6050          */
6051
6052         j_errno = jbd2_journal_errno(journal);
6053         if (j_errno) {
6054                 char nbuf[16];
6055
6056                 errstr = ext4_decode_error(sb, j_errno, nbuf);
6057                 ext4_warning(sb, "Filesystem error recorded "
6058                              "from previous mount: %s", errstr);
6059                 ext4_warning(sb, "Marking fs in need of filesystem check.");
6060
6061                 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
6062                 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
6063                 ext4_commit_super(sb);
6064
6065                 jbd2_journal_clear_err(journal);
6066                 jbd2_journal_update_sb_errno(journal);
6067         }
6068         return 0;
6069 }
6070
6071 /*
6072  * Force the running and committing transactions to commit,
6073  * and wait on the commit.
6074  */
6075 int ext4_force_commit(struct super_block *sb)
6076 {
6077         journal_t *journal;
6078
6079         if (sb_rdonly(sb))
6080                 return 0;
6081
6082         journal = EXT4_SB(sb)->s_journal;
6083         return ext4_journal_force_commit(journal);
6084 }
6085
6086 static int ext4_sync_fs(struct super_block *sb, int wait)
6087 {
6088         int ret = 0;
6089         tid_t target;
6090         bool needs_barrier = false;
6091         struct ext4_sb_info *sbi = EXT4_SB(sb);
6092
6093         if (unlikely(ext4_forced_shutdown(sbi)))
6094                 return 0;
6095
6096         trace_ext4_sync_fs(sb, wait);
6097         flush_workqueue(sbi->rsv_conversion_wq);
6098         /*
6099          * Writeback quota in non-journalled quota case - journalled quota has
6100          * no dirty dquots
6101          */
6102         dquot_writeback_dquots(sb, -1);
6103         /*
6104          * Data writeback is possible w/o journal transaction, so barrier must
6105          * being sent at the end of the function. But we can skip it if
6106          * transaction_commit will do it for us.
6107          */
6108         if (sbi->s_journal) {
6109                 target = jbd2_get_latest_transaction(sbi->s_journal);
6110                 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
6111                     !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
6112                         needs_barrier = true;
6113
6114                 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
6115                         if (wait)
6116                                 ret = jbd2_log_wait_commit(sbi->s_journal,
6117                                                            target);
6118                 }
6119         } else if (wait && test_opt(sb, BARRIER))
6120                 needs_barrier = true;
6121         if (needs_barrier) {
6122                 int err;
6123                 err = blkdev_issue_flush(sb->s_bdev);
6124                 if (!ret)
6125                         ret = err;
6126         }
6127
6128         return ret;
6129 }
6130
6131 /*
6132  * LVM calls this function before a (read-only) snapshot is created.  This
6133  * gives us a chance to flush the journal completely and mark the fs clean.
6134  *
6135  * Note that only this function cannot bring a filesystem to be in a clean
6136  * state independently. It relies on upper layer to stop all data & metadata
6137  * modifications.
6138  */
6139 static int ext4_freeze(struct super_block *sb)
6140 {
6141         int error = 0;
6142         journal_t *journal;
6143
6144         if (sb_rdonly(sb))
6145                 return 0;
6146
6147         journal = EXT4_SB(sb)->s_journal;
6148
6149         if (journal) {
6150                 /* Now we set up the journal barrier. */
6151                 jbd2_journal_lock_updates(journal);
6152
6153                 /*
6154                  * Don't clear the needs_recovery flag if we failed to
6155                  * flush the journal.
6156                  */
6157                 error = jbd2_journal_flush(journal, 0);
6158                 if (error < 0)
6159                         goto out;
6160
6161                 /* Journal blocked and flushed, clear needs_recovery flag. */
6162                 ext4_clear_feature_journal_needs_recovery(sb);
6163                 if (ext4_orphan_file_empty(sb))
6164                         ext4_clear_feature_orphan_present(sb);
6165         }
6166
6167         error = ext4_commit_super(sb);
6168 out:
6169         if (journal)
6170                 /* we rely on upper layer to stop further updates */
6171                 jbd2_journal_unlock_updates(journal);
6172         return error;
6173 }
6174
6175 /*
6176  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
6177  * flag here, even though the filesystem is not technically dirty yet.
6178  */
6179 static int ext4_unfreeze(struct super_block *sb)
6180 {
6181         if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
6182                 return 0;
6183
6184         if (EXT4_SB(sb)->s_journal) {
6185                 /* Reset the needs_recovery flag before the fs is unlocked. */
6186                 ext4_set_feature_journal_needs_recovery(sb);
6187                 if (ext4_has_feature_orphan_file(sb))
6188                         ext4_set_feature_orphan_present(sb);
6189         }
6190
6191         ext4_commit_super(sb);
6192         return 0;
6193 }
6194
6195 /*
6196  * Structure to save mount options for ext4_remount's benefit
6197  */
6198 struct ext4_mount_options {
6199         unsigned long s_mount_opt;
6200         unsigned long s_mount_opt2;
6201         kuid_t s_resuid;
6202         kgid_t s_resgid;
6203         unsigned long s_commit_interval;
6204         u32 s_min_batch_time, s_max_batch_time;
6205 #ifdef CONFIG_QUOTA
6206         int s_jquota_fmt;
6207         char *s_qf_names[EXT4_MAXQUOTAS];
6208 #endif
6209 };
6210
6211 static int __ext4_remount(struct fs_context *fc, struct super_block *sb)
6212 {
6213         struct ext4_fs_context *ctx = fc->fs_private;
6214         struct ext4_super_block *es;
6215         struct ext4_sb_info *sbi = EXT4_SB(sb);
6216         unsigned long old_sb_flags;
6217         struct ext4_mount_options old_opts;
6218         ext4_group_t g;
6219         int err = 0;
6220 #ifdef CONFIG_QUOTA
6221         int enable_quota = 0;
6222         int i, j;
6223         char *to_free[EXT4_MAXQUOTAS];
6224 #endif
6225
6226         ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
6227
6228         /* Store the original options */
6229         old_sb_flags = sb->s_flags;
6230         old_opts.s_mount_opt = sbi->s_mount_opt;
6231         old_opts.s_mount_opt2 = sbi->s_mount_opt2;
6232         old_opts.s_resuid = sbi->s_resuid;
6233         old_opts.s_resgid = sbi->s_resgid;
6234         old_opts.s_commit_interval = sbi->s_commit_interval;
6235         old_opts.s_min_batch_time = sbi->s_min_batch_time;
6236         old_opts.s_max_batch_time = sbi->s_max_batch_time;
6237 #ifdef CONFIG_QUOTA
6238         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
6239         for (i = 0; i < EXT4_MAXQUOTAS; i++)
6240                 if (sbi->s_qf_names[i]) {
6241                         char *qf_name = get_qf_name(sb, sbi, i);
6242
6243                         old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
6244                         if (!old_opts.s_qf_names[i]) {
6245                                 for (j = 0; j < i; j++)
6246                                         kfree(old_opts.s_qf_names[j]);
6247                                 return -ENOMEM;
6248                         }
6249                 } else
6250                         old_opts.s_qf_names[i] = NULL;
6251 #endif
6252         if (sbi->s_journal && sbi->s_journal->j_task->io_context)
6253                 ctx->journal_ioprio =
6254                         sbi->s_journal->j_task->io_context->ioprio;
6255
6256         ext4_apply_options(fc, sb);
6257
6258         if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
6259             test_opt(sb, JOURNAL_CHECKSUM)) {
6260                 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
6261                          "during remount not supported; ignoring");
6262                 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6263         }
6264
6265         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
6266                 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
6267                         ext4_msg(sb, KERN_ERR, "can't mount with "
6268                                  "both data=journal and delalloc");
6269                         err = -EINVAL;
6270                         goto restore_opts;
6271                 }
6272                 if (test_opt(sb, DIOREAD_NOLOCK)) {
6273                         ext4_msg(sb, KERN_ERR, "can't mount with "
6274                                  "both data=journal and dioread_nolock");
6275                         err = -EINVAL;
6276                         goto restore_opts;
6277                 }
6278         } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
6279                 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
6280                         ext4_msg(sb, KERN_ERR, "can't mount with "
6281                                 "journal_async_commit in data=ordered mode");
6282                         err = -EINVAL;
6283                         goto restore_opts;
6284                 }
6285         }
6286
6287         if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
6288                 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
6289                 err = -EINVAL;
6290                 goto restore_opts;
6291         }
6292
6293         if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED))
6294                 ext4_abort(sb, ESHUTDOWN, "Abort forced by user");
6295
6296         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
6297                 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
6298
6299         es = sbi->s_es;
6300
6301         if (sbi->s_journal) {
6302                 ext4_init_journal_params(sb, sbi->s_journal);
6303                 set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio);
6304         }
6305
6306         /* Flush outstanding errors before changing fs state */
6307         flush_work(&sbi->s_error_work);
6308
6309         if ((bool)(fc->sb_flags & SB_RDONLY) != sb_rdonly(sb)) {
6310                 if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED)) {
6311                         err = -EROFS;
6312                         goto restore_opts;
6313                 }
6314
6315                 if (fc->sb_flags & SB_RDONLY) {
6316                         err = sync_filesystem(sb);
6317                         if (err < 0)
6318                                 goto restore_opts;
6319                         err = dquot_suspend(sb, -1);
6320                         if (err < 0)
6321                                 goto restore_opts;
6322
6323                         /*
6324                          * First of all, the unconditional stuff we have to do
6325                          * to disable replay of the journal when we next remount
6326                          */
6327                         sb->s_flags |= SB_RDONLY;
6328
6329                         /*
6330                          * OK, test if we are remounting a valid rw partition
6331                          * readonly, and if so set the rdonly flag and then
6332                          * mark the partition as valid again.
6333                          */
6334                         if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
6335                             (sbi->s_mount_state & EXT4_VALID_FS))
6336                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
6337
6338                         if (sbi->s_journal) {
6339                                 /*
6340                                  * We let remount-ro finish even if marking fs
6341                                  * as clean failed...
6342                                  */
6343                                 ext4_mark_recovery_complete(sb, es);
6344                         }
6345                 } else {
6346                         /* Make sure we can mount this feature set readwrite */
6347                         if (ext4_has_feature_readonly(sb) ||
6348                             !ext4_feature_set_ok(sb, 0)) {
6349                                 err = -EROFS;
6350                                 goto restore_opts;
6351                         }
6352                         /*
6353                          * Make sure the group descriptor checksums
6354                          * are sane.  If they aren't, refuse to remount r/w.
6355                          */
6356                         for (g = 0; g < sbi->s_groups_count; g++) {
6357                                 struct ext4_group_desc *gdp =
6358                                         ext4_get_group_desc(sb, g, NULL);
6359
6360                                 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
6361                                         ext4_msg(sb, KERN_ERR,
6362                "ext4_remount: Checksum for group %u failed (%u!=%u)",
6363                 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
6364                                                le16_to_cpu(gdp->bg_checksum));
6365                                         err = -EFSBADCRC;
6366                                         goto restore_opts;
6367                                 }
6368                         }
6369
6370                         /*
6371                          * If we have an unprocessed orphan list hanging
6372                          * around from a previously readonly bdev mount,
6373                          * require a full umount/remount for now.
6374                          */
6375                         if (es->s_last_orphan || !ext4_orphan_file_empty(sb)) {
6376                                 ext4_msg(sb, KERN_WARNING, "Couldn't "
6377                                        "remount RDWR because of unprocessed "
6378                                        "orphan inode list.  Please "
6379                                        "umount/remount instead");
6380                                 err = -EINVAL;
6381                                 goto restore_opts;
6382                         }
6383
6384                         /*
6385                          * Mounting a RDONLY partition read-write, so reread
6386                          * and store the current valid flag.  (It may have
6387                          * been changed by e2fsck since we originally mounted
6388                          * the partition.)
6389                          */
6390                         if (sbi->s_journal) {
6391                                 err = ext4_clear_journal_err(sb, es);
6392                                 if (err)
6393                                         goto restore_opts;
6394                         }
6395                         sbi->s_mount_state = le16_to_cpu(es->s_state);
6396
6397                         err = ext4_setup_super(sb, es, 0);
6398                         if (err)
6399                                 goto restore_opts;
6400
6401                         sb->s_flags &= ~SB_RDONLY;
6402                         if (ext4_has_feature_mmp(sb))
6403                                 if (ext4_multi_mount_protect(sb,
6404                                                 le64_to_cpu(es->s_mmp_block))) {
6405                                         err = -EROFS;
6406                                         goto restore_opts;
6407                                 }
6408 #ifdef CONFIG_QUOTA
6409                         enable_quota = 1;
6410 #endif
6411                 }
6412         }
6413
6414         /*
6415          * Reinitialize lazy itable initialization thread based on
6416          * current settings
6417          */
6418         if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
6419                 ext4_unregister_li_request(sb);
6420         else {
6421                 ext4_group_t first_not_zeroed;
6422                 first_not_zeroed = ext4_has_uninit_itable(sb);
6423                 ext4_register_li_request(sb, first_not_zeroed);
6424         }
6425
6426         /*
6427          * Handle creation of system zone data early because it can fail.
6428          * Releasing of existing data is done when we are sure remount will
6429          * succeed.
6430          */
6431         if (test_opt(sb, BLOCK_VALIDITY) && !sbi->s_system_blks) {
6432                 err = ext4_setup_system_zone(sb);
6433                 if (err)
6434                         goto restore_opts;
6435         }
6436
6437         if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
6438                 err = ext4_commit_super(sb);
6439                 if (err)
6440                         goto restore_opts;
6441         }
6442
6443 #ifdef CONFIG_QUOTA
6444         /* Release old quota file names */
6445         for (i = 0; i < EXT4_MAXQUOTAS; i++)
6446                 kfree(old_opts.s_qf_names[i]);
6447         if (enable_quota) {
6448                 if (sb_any_quota_suspended(sb))
6449                         dquot_resume(sb, -1);
6450                 else if (ext4_has_feature_quota(sb)) {
6451                         err = ext4_enable_quotas(sb);
6452                         if (err)
6453                                 goto restore_opts;
6454                 }
6455         }
6456 #endif
6457         if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
6458                 ext4_release_system_zone(sb);
6459
6460         if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))
6461                 ext4_stop_mmpd(sbi);
6462
6463         return 0;
6464
6465 restore_opts:
6466         sb->s_flags = old_sb_flags;
6467         sbi->s_mount_opt = old_opts.s_mount_opt;
6468         sbi->s_mount_opt2 = old_opts.s_mount_opt2;
6469         sbi->s_resuid = old_opts.s_resuid;
6470         sbi->s_resgid = old_opts.s_resgid;
6471         sbi->s_commit_interval = old_opts.s_commit_interval;
6472         sbi->s_min_batch_time = old_opts.s_min_batch_time;
6473         sbi->s_max_batch_time = old_opts.s_max_batch_time;
6474         if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
6475                 ext4_release_system_zone(sb);
6476 #ifdef CONFIG_QUOTA
6477         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
6478         for (i = 0; i < EXT4_MAXQUOTAS; i++) {
6479                 to_free[i] = get_qf_name(sb, sbi, i);
6480                 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
6481         }
6482         synchronize_rcu();
6483         for (i = 0; i < EXT4_MAXQUOTAS; i++)
6484                 kfree(to_free[i]);
6485 #endif
6486         if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))
6487                 ext4_stop_mmpd(sbi);
6488         return err;
6489 }
6490
6491 static int ext4_reconfigure(struct fs_context *fc)
6492 {
6493         struct super_block *sb = fc->root->d_sb;
6494         int ret;
6495
6496         fc->s_fs_info = EXT4_SB(sb);
6497
6498         ret = ext4_check_opt_consistency(fc, sb);
6499         if (ret < 0)
6500                 return ret;
6501
6502         ret = __ext4_remount(fc, sb);
6503         if (ret < 0)
6504                 return ret;
6505
6506         ext4_msg(sb, KERN_INFO, "re-mounted. Quota mode: %s.",
6507                  ext4_quota_mode(sb));
6508
6509         return 0;
6510 }
6511
6512 #ifdef CONFIG_QUOTA
6513 static int ext4_statfs_project(struct super_block *sb,
6514                                kprojid_t projid, struct kstatfs *buf)
6515 {
6516         struct kqid qid;
6517         struct dquot *dquot;
6518         u64 limit;
6519         u64 curblock;
6520
6521         qid = make_kqid_projid(projid);
6522         dquot = dqget(sb, qid);
6523         if (IS_ERR(dquot))
6524                 return PTR_ERR(dquot);
6525         spin_lock(&dquot->dq_dqb_lock);
6526
6527         limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit,
6528                              dquot->dq_dqb.dqb_bhardlimit);
6529         limit >>= sb->s_blocksize_bits;
6530
6531         if (limit && buf->f_blocks > limit) {
6532                 curblock = (dquot->dq_dqb.dqb_curspace +
6533                             dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
6534                 buf->f_blocks = limit;
6535                 buf->f_bfree = buf->f_bavail =
6536                         (buf->f_blocks > curblock) ?
6537                          (buf->f_blocks - curblock) : 0;
6538         }
6539
6540         limit = min_not_zero(dquot->dq_dqb.dqb_isoftlimit,
6541                              dquot->dq_dqb.dqb_ihardlimit);
6542         if (limit && buf->f_files > limit) {
6543                 buf->f_files = limit;
6544                 buf->f_ffree =
6545                         (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
6546                          (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
6547         }
6548
6549         spin_unlock(&dquot->dq_dqb_lock);
6550         dqput(dquot);
6551         return 0;
6552 }
6553 #endif
6554
6555 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
6556 {
6557         struct super_block *sb = dentry->d_sb;
6558         struct ext4_sb_info *sbi = EXT4_SB(sb);
6559         struct ext4_super_block *es = sbi->s_es;
6560         ext4_fsblk_t overhead = 0, resv_blocks;
6561         s64 bfree;
6562         resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
6563
6564         if (!test_opt(sb, MINIX_DF))
6565                 overhead = sbi->s_overhead;
6566
6567         buf->f_type = EXT4_SUPER_MAGIC;
6568         buf->f_bsize = sb->s_blocksize;
6569         buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
6570         bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
6571                 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
6572         /* prevent underflow in case that few free space is available */
6573         buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
6574         buf->f_bavail = buf->f_bfree -
6575                         (ext4_r_blocks_count(es) + resv_blocks);
6576         if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
6577                 buf->f_bavail = 0;
6578         buf->f_files = le32_to_cpu(es->s_inodes_count);
6579         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
6580         buf->f_namelen = EXT4_NAME_LEN;
6581         buf->f_fsid = uuid_to_fsid(es->s_uuid);
6582
6583 #ifdef CONFIG_QUOTA
6584         if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
6585             sb_has_quota_limits_enabled(sb, PRJQUOTA))
6586                 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
6587 #endif
6588         return 0;
6589 }
6590
6591
6592 #ifdef CONFIG_QUOTA
6593
6594 /*
6595  * Helper functions so that transaction is started before we acquire dqio_sem
6596  * to keep correct lock ordering of transaction > dqio_sem
6597  */
6598 static inline struct inode *dquot_to_inode(struct dquot *dquot)
6599 {
6600         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
6601 }
6602
6603 static int ext4_write_dquot(struct dquot *dquot)
6604 {
6605         int ret, err;
6606         handle_t *handle;
6607         struct inode *inode;
6608
6609         inode = dquot_to_inode(dquot);
6610         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
6611                                     EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
6612         if (IS_ERR(handle))
6613                 return PTR_ERR(handle);
6614         ret = dquot_commit(dquot);
6615         err = ext4_journal_stop(handle);
6616         if (!ret)
6617                 ret = err;
6618         return ret;
6619 }
6620
6621 static int ext4_acquire_dquot(struct dquot *dquot)
6622 {
6623         int ret, err;
6624         handle_t *handle;
6625
6626         handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
6627                                     EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
6628         if (IS_ERR(handle))
6629                 return PTR_ERR(handle);
6630         ret = dquot_acquire(dquot);
6631         err = ext4_journal_stop(handle);
6632         if (!ret)
6633                 ret = err;
6634         return ret;
6635 }
6636
6637 static int ext4_release_dquot(struct dquot *dquot)
6638 {
6639         int ret, err;
6640         handle_t *handle;
6641
6642         handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
6643                                     EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
6644         if (IS_ERR(handle)) {
6645                 /* Release dquot anyway to avoid endless cycle in dqput() */
6646                 dquot_release(dquot);
6647                 return PTR_ERR(handle);
6648         }
6649         ret = dquot_release(dquot);
6650         err = ext4_journal_stop(handle);
6651         if (!ret)
6652                 ret = err;
6653         return ret;
6654 }
6655
6656 static int ext4_mark_dquot_dirty(struct dquot *dquot)
6657 {
6658         struct super_block *sb = dquot->dq_sb;
6659
6660         if (ext4_is_quota_journalled(sb)) {
6661                 dquot_mark_dquot_dirty(dquot);
6662                 return ext4_write_dquot(dquot);
6663         } else {
6664                 return dquot_mark_dquot_dirty(dquot);
6665         }
6666 }
6667
6668 static int ext4_write_info(struct super_block *sb, int type)
6669 {
6670         int ret, err;
6671         handle_t *handle;
6672
6673         /* Data block + inode block */
6674         handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
6675         if (IS_ERR(handle))
6676                 return PTR_ERR(handle);
6677         ret = dquot_commit_info(sb, type);
6678         err = ext4_journal_stop(handle);
6679         if (!ret)
6680                 ret = err;
6681         return ret;
6682 }
6683
6684 static void lockdep_set_quota_inode(struct inode *inode, int subclass)
6685 {
6686         struct ext4_inode_info *ei = EXT4_I(inode);
6687
6688         /* The first argument of lockdep_set_subclass has to be
6689          * *exactly* the same as the argument to init_rwsem() --- in
6690          * this case, in init_once() --- or lockdep gets unhappy
6691          * because the name of the lock is set using the
6692          * stringification of the argument to init_rwsem().
6693          */
6694         (void) ei;      /* shut up clang warning if !CONFIG_LOCKDEP */
6695         lockdep_set_subclass(&ei->i_data_sem, subclass);
6696 }
6697
6698 /*
6699  * Standard function to be called on quota_on
6700  */
6701 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
6702                          const struct path *path)
6703 {
6704         int err;
6705
6706         if (!test_opt(sb, QUOTA))
6707                 return -EINVAL;
6708
6709         /* Quotafile not on the same filesystem? */
6710         if (path->dentry->d_sb != sb)
6711                 return -EXDEV;
6712
6713         /* Quota already enabled for this file? */
6714         if (IS_NOQUOTA(d_inode(path->dentry)))
6715                 return -EBUSY;
6716
6717         /* Journaling quota? */
6718         if (EXT4_SB(sb)->s_qf_names[type]) {
6719                 /* Quotafile not in fs root? */
6720                 if (path->dentry->d_parent != sb->s_root)
6721                         ext4_msg(sb, KERN_WARNING,
6722                                 "Quota file not on filesystem root. "
6723                                 "Journaled quota will not work");
6724                 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
6725         } else {
6726                 /*
6727                  * Clear the flag just in case mount options changed since
6728                  * last time.
6729                  */
6730                 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
6731         }
6732
6733         /*
6734          * When we journal data on quota file, we have to flush journal to see
6735          * all updates to the file when we bypass pagecache...
6736          */
6737         if (EXT4_SB(sb)->s_journal &&
6738             ext4_should_journal_data(d_inode(path->dentry))) {
6739                 /*
6740                  * We don't need to lock updates but journal_flush() could
6741                  * otherwise be livelocked...
6742                  */
6743                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
6744                 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
6745                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
6746                 if (err)
6747                         return err;
6748         }
6749
6750         lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
6751         err = dquot_quota_on(sb, type, format_id, path);
6752         if (!err) {
6753                 struct inode *inode = d_inode(path->dentry);
6754                 handle_t *handle;
6755
6756                 /*
6757                  * Set inode flags to prevent userspace from messing with quota
6758                  * files. If this fails, we return success anyway since quotas
6759                  * are already enabled and this is not a hard failure.
6760                  */
6761                 inode_lock(inode);
6762                 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
6763                 if (IS_ERR(handle))
6764                         goto unlock_inode;
6765                 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
6766                 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
6767                                 S_NOATIME | S_IMMUTABLE);
6768                 err = ext4_mark_inode_dirty(handle, inode);
6769                 ext4_journal_stop(handle);
6770         unlock_inode:
6771                 inode_unlock(inode);
6772                 if (err)
6773                         dquot_quota_off(sb, type);
6774         }
6775         if (err)
6776                 lockdep_set_quota_inode(path->dentry->d_inode,
6777                                              I_DATA_SEM_NORMAL);
6778         return err;
6779 }
6780
6781 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
6782                              unsigned int flags)
6783 {
6784         int err;
6785         struct inode *qf_inode;
6786         unsigned long qf_inums[EXT4_MAXQUOTAS] = {
6787                 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
6788                 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
6789                 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
6790         };
6791
6792         BUG_ON(!ext4_has_feature_quota(sb));
6793
6794         if (!qf_inums[type])
6795                 return -EPERM;
6796
6797         qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
6798         if (IS_ERR(qf_inode)) {
6799                 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
6800                 return PTR_ERR(qf_inode);
6801         }
6802
6803         /* Don't account quota for quota files to avoid recursion */
6804         qf_inode->i_flags |= S_NOQUOTA;
6805         lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
6806         err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
6807         if (err)
6808                 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
6809         iput(qf_inode);
6810
6811         return err;
6812 }
6813
6814 /* Enable usage tracking for all quota types. */
6815 int ext4_enable_quotas(struct super_block *sb)
6816 {
6817         int type, err = 0;
6818         unsigned long qf_inums[EXT4_MAXQUOTAS] = {
6819                 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
6820                 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
6821                 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
6822         };
6823         bool quota_mopt[EXT4_MAXQUOTAS] = {
6824                 test_opt(sb, USRQUOTA),
6825                 test_opt(sb, GRPQUOTA),
6826                 test_opt(sb, PRJQUOTA),
6827         };
6828
6829         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
6830         for (type = 0; type < EXT4_MAXQUOTAS; type++) {
6831                 if (qf_inums[type]) {
6832                         err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
6833                                 DQUOT_USAGE_ENABLED |
6834                                 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
6835                         if (err) {
6836                                 ext4_warning(sb,
6837                                         "Failed to enable quota tracking "
6838                                         "(type=%d, err=%d). Please run "
6839                                         "e2fsck to fix.", type, err);
6840                                 for (type--; type >= 0; type--) {
6841                                         struct inode *inode;
6842
6843                                         inode = sb_dqopt(sb)->files[type];
6844                                         if (inode)
6845                                                 inode = igrab(inode);
6846                                         dquot_quota_off(sb, type);
6847                                         if (inode) {
6848                                                 lockdep_set_quota_inode(inode,
6849                                                         I_DATA_SEM_NORMAL);
6850                                                 iput(inode);
6851                                         }
6852                                 }
6853
6854                                 return err;
6855                         }
6856                 }
6857         }
6858         return 0;
6859 }
6860
6861 static int ext4_quota_off(struct super_block *sb, int type)
6862 {
6863         struct inode *inode = sb_dqopt(sb)->files[type];
6864         handle_t *handle;
6865         int err;
6866
6867         /* Force all delayed allocation blocks to be allocated.
6868          * Caller already holds s_umount sem */
6869         if (test_opt(sb, DELALLOC))
6870                 sync_filesystem(sb);
6871
6872         if (!inode || !igrab(inode))
6873                 goto out;
6874
6875         err = dquot_quota_off(sb, type);
6876         if (err || ext4_has_feature_quota(sb))
6877                 goto out_put;
6878
6879         inode_lock(inode);
6880         /*
6881          * Update modification times of quota files when userspace can
6882          * start looking at them. If we fail, we return success anyway since
6883          * this is not a hard failure and quotas are already disabled.
6884          */
6885         handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
6886         if (IS_ERR(handle)) {
6887                 err = PTR_ERR(handle);
6888                 goto out_unlock;
6889         }
6890         EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
6891         inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
6892         inode->i_mtime = inode->i_ctime = current_time(inode);
6893         err = ext4_mark_inode_dirty(handle, inode);
6894         ext4_journal_stop(handle);
6895 out_unlock:
6896         inode_unlock(inode);
6897 out_put:
6898         lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
6899         iput(inode);
6900         return err;
6901 out:
6902         return dquot_quota_off(sb, type);
6903 }
6904
6905 /* Read data from quotafile - avoid pagecache and such because we cannot afford
6906  * acquiring the locks... As quota files are never truncated and quota code
6907  * itself serializes the operations (and no one else should touch the files)
6908  * we don't have to be afraid of races */
6909 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
6910                                size_t len, loff_t off)
6911 {
6912         struct inode *inode = sb_dqopt(sb)->files[type];
6913         ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
6914         int offset = off & (sb->s_blocksize - 1);
6915         int tocopy;
6916         size_t toread;
6917         struct buffer_head *bh;
6918         loff_t i_size = i_size_read(inode);
6919
6920         if (off > i_size)
6921                 return 0;
6922         if (off+len > i_size)
6923                 len = i_size-off;
6924         toread = len;
6925         while (toread > 0) {
6926                 tocopy = sb->s_blocksize - offset < toread ?
6927                                 sb->s_blocksize - offset : toread;
6928                 bh = ext4_bread(NULL, inode, blk, 0);
6929                 if (IS_ERR(bh))
6930                         return PTR_ERR(bh);
6931                 if (!bh)        /* A hole? */
6932                         memset(data, 0, tocopy);
6933                 else
6934                         memcpy(data, bh->b_data+offset, tocopy);
6935                 brelse(bh);
6936                 offset = 0;
6937                 toread -= tocopy;
6938                 data += tocopy;
6939                 blk++;
6940         }
6941         return len;
6942 }
6943
6944 /* Write to quotafile (we know the transaction is already started and has
6945  * enough credits) */
6946 static ssize_t ext4_quota_write(struct super_block *sb, int type,
6947                                 const char *data, size_t len, loff_t off)
6948 {
6949         struct inode *inode = sb_dqopt(sb)->files[type];
6950         ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
6951         int err = 0, err2 = 0, offset = off & (sb->s_blocksize - 1);
6952         int retries = 0;
6953         struct buffer_head *bh;
6954         handle_t *handle = journal_current_handle();
6955
6956         if (!handle) {
6957                 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6958                         " cancelled because transaction is not started",
6959                         (unsigned long long)off, (unsigned long long)len);
6960                 return -EIO;
6961         }
6962         /*
6963          * Since we account only one data block in transaction credits,
6964          * then it is impossible to cross a block boundary.
6965          */
6966         if (sb->s_blocksize - offset < len) {
6967                 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6968                         " cancelled because not block aligned",
6969                         (unsigned long long)off, (unsigned long long)len);
6970                 return -EIO;
6971         }
6972
6973         do {
6974                 bh = ext4_bread(handle, inode, blk,
6975                                 EXT4_GET_BLOCKS_CREATE |
6976                                 EXT4_GET_BLOCKS_METADATA_NOFAIL);
6977         } while (PTR_ERR(bh) == -ENOSPC &&
6978                  ext4_should_retry_alloc(inode->i_sb, &retries));
6979         if (IS_ERR(bh))
6980                 return PTR_ERR(bh);
6981         if (!bh)
6982                 goto out;
6983         BUFFER_TRACE(bh, "get write access");
6984         err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE);
6985         if (err) {
6986                 brelse(bh);
6987                 return err;
6988         }
6989         lock_buffer(bh);
6990         memcpy(bh->b_data+offset, data, len);
6991         flush_dcache_page(bh->b_page);
6992         unlock_buffer(bh);
6993         err = ext4_handle_dirty_metadata(handle, NULL, bh);
6994         brelse(bh);
6995 out:
6996         if (inode->i_size < off + len) {
6997                 i_size_write(inode, off + len);
6998                 EXT4_I(inode)->i_disksize = inode->i_size;
6999                 err2 = ext4_mark_inode_dirty(handle, inode);
7000                 if (unlikely(err2 && !err))
7001                         err = err2;
7002         }
7003         return err ? err : len;
7004 }
7005 #endif
7006
7007 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
7008 static inline void register_as_ext2(void)
7009 {
7010         int err = register_filesystem(&ext2_fs_type);
7011         if (err)
7012                 printk(KERN_WARNING
7013                        "EXT4-fs: Unable to register as ext2 (%d)\n", err);
7014 }
7015
7016 static inline void unregister_as_ext2(void)
7017 {
7018         unregister_filesystem(&ext2_fs_type);
7019 }
7020
7021 static inline int ext2_feature_set_ok(struct super_block *sb)
7022 {
7023         if (ext4_has_unknown_ext2_incompat_features(sb))
7024                 return 0;
7025         if (sb_rdonly(sb))
7026                 return 1;
7027         if (ext4_has_unknown_ext2_ro_compat_features(sb))
7028                 return 0;
7029         return 1;
7030 }
7031 #else
7032 static inline void register_as_ext2(void) { }
7033 static inline void unregister_as_ext2(void) { }
7034 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
7035 #endif
7036
7037 static inline void register_as_ext3(void)
7038 {
7039         int err = register_filesystem(&ext3_fs_type);
7040         if (err)
7041                 printk(KERN_WARNING
7042                        "EXT4-fs: Unable to register as ext3 (%d)\n", err);
7043 }
7044
7045 static inline void unregister_as_ext3(void)
7046 {
7047         unregister_filesystem(&ext3_fs_type);
7048 }
7049
7050 static inline int ext3_feature_set_ok(struct super_block *sb)
7051 {
7052         if (ext4_has_unknown_ext3_incompat_features(sb))
7053                 return 0;
7054         if (!ext4_has_feature_journal(sb))
7055                 return 0;
7056         if (sb_rdonly(sb))
7057                 return 1;
7058         if (ext4_has_unknown_ext3_ro_compat_features(sb))
7059                 return 0;
7060         return 1;
7061 }
7062
7063 static struct file_system_type ext4_fs_type = {
7064         .owner                  = THIS_MODULE,
7065         .name                   = "ext4",
7066         .init_fs_context        = ext4_init_fs_context,
7067         .parameters             = ext4_param_specs,
7068         .kill_sb                = kill_block_super,
7069         .fs_flags               = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
7070 };
7071 MODULE_ALIAS_FS("ext4");
7072
7073 /* Shared across all ext4 file systems */
7074 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
7075
7076 static int __init ext4_init_fs(void)
7077 {
7078         int i, err;
7079
7080         ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
7081         ext4_li_info = NULL;
7082
7083         /* Build-time check for flags consistency */
7084         ext4_check_flag_values();
7085
7086         for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
7087                 init_waitqueue_head(&ext4__ioend_wq[i]);
7088
7089         err = ext4_init_es();
7090         if (err)
7091                 return err;
7092
7093         err = ext4_init_pending();
7094         if (err)
7095                 goto out7;
7096
7097         err = ext4_init_post_read_processing();
7098         if (err)
7099                 goto out6;
7100
7101         err = ext4_init_pageio();
7102         if (err)
7103                 goto out5;
7104
7105         err = ext4_init_system_zone();
7106         if (err)
7107                 goto out4;
7108
7109         err = ext4_init_sysfs();
7110         if (err)
7111                 goto out3;
7112
7113         err = ext4_init_mballoc();
7114         if (err)
7115                 goto out2;
7116         err = init_inodecache();
7117         if (err)
7118                 goto out1;
7119
7120         err = ext4_fc_init_dentry_cache();
7121         if (err)
7122                 goto out05;
7123
7124         register_as_ext3();
7125         register_as_ext2();
7126         err = register_filesystem(&ext4_fs_type);
7127         if (err)
7128                 goto out;
7129
7130         return 0;
7131 out:
7132         unregister_as_ext2();
7133         unregister_as_ext3();
7134         ext4_fc_destroy_dentry_cache();
7135 out05:
7136         destroy_inodecache();
7137 out1:
7138         ext4_exit_mballoc();
7139 out2:
7140         ext4_exit_sysfs();
7141 out3:
7142         ext4_exit_system_zone();
7143 out4:
7144         ext4_exit_pageio();
7145 out5:
7146         ext4_exit_post_read_processing();
7147 out6:
7148         ext4_exit_pending();
7149 out7:
7150         ext4_exit_es();
7151
7152         return err;
7153 }
7154
7155 static void __exit ext4_exit_fs(void)
7156 {
7157         ext4_destroy_lazyinit_thread();
7158         unregister_as_ext2();
7159         unregister_as_ext3();
7160         unregister_filesystem(&ext4_fs_type);
7161         ext4_fc_destroy_dentry_cache();
7162         destroy_inodecache();
7163         ext4_exit_mballoc();
7164         ext4_exit_sysfs();
7165         ext4_exit_system_zone();
7166         ext4_exit_pageio();
7167         ext4_exit_post_read_processing();
7168         ext4_exit_es();
7169         ext4_exit_pending();
7170 }
7171
7172 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
7173 MODULE_DESCRIPTION("Fourth Extended Filesystem");
7174 MODULE_LICENSE("GPL");
7175 MODULE_SOFTDEP("pre: crc32c");
7176 module_init(ext4_init_fs)
7177 module_exit(ext4_exit_fs)