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
  50 #include "ext4.h"
  51 #include "ext4_extents.h"       /* Needed for trace points definition */
  52 #include "ext4_jbd2.h"
  53 #include "xattr.h"
  54 #include "acl.h"
  55 #include "mballoc.h"
  56 #include "fsmap.h"
  57
  58 #define CREATE_TRACE_POINTS
  59 #include <trace/events/ext4.h>
  60
  61 static struct ext4_lazy_init *ext4_li_info;
  62 static DEFINE_MUTEX(ext4_li_mtx);
  63 static struct ratelimit_state ext4_mount_msg_ratelimit;
  64
  65 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
  66                              unsigned long journal_devnum);
  67 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
  68 static void ext4_update_super(struct super_block *sb);
  69 static int ext4_commit_super(struct super_block *sb);
  70 static int ext4_mark_recovery_complete(struct super_block *sb,
  71                                         struct ext4_super_block *es);
  72 static int ext4_clear_journal_err(struct super_block *sb,
  73                                   struct ext4_super_block *es);
  74 static int ext4_sync_fs(struct super_block *sb, int wait);
  75 static int ext4_remount(struct super_block *sb, int *flags, char *data);
  76 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
  77 static int ext4_unfreeze(struct super_block *sb);
  78 static int ext4_freeze(struct super_block *sb);
  79 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
  80                        const char *dev_name, void *data);
  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
  89 /*
  90  * Lock ordering
  91  *
  92  * page fault path:
  93  * mmap_lock -> sb_start_pagefault -> invalidate_lock (r) -> transaction start
  94  *   -> page lock -> i_data_sem (rw)
  95  *
  96  * buffered write path:
  97  * sb_start_write -> i_mutex -> mmap_lock
  98  * sb_start_write -> i_mutex -> transaction start -> page lock ->
  99  *   i_data_sem (rw)
 100  *
 101  * truncate:
 102  * sb_start_write -> i_mutex -> invalidate_lock (w) -> i_mmap_rwsem (w) ->
 103  *   page lock
 104  * sb_start_write -> i_mutex -> invalidate_lock (w) -> transaction start ->
 105  *   i_data_sem (rw)
 106  *
 107  * direct IO:
 108  * sb_start_write -> i_mutex -> mmap_lock
 109  * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
 110  *
 111  * writepages:
 112  * transaction start -> page lock(s) -> i_data_sem (rw)
 113  */
 114
 115 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
 116 static struct file_system_type ext2_fs_type = {
 117         .owner          = THIS_MODULE,
 118         .name           = "ext2",
 119         .mount          = ext4_mount,
 120         .kill_sb        = kill_block_super,
 121         .fs_flags       = FS_REQUIRES_DEV,
 122 };
 123 MODULE_ALIAS_FS("ext2");
 124 MODULE_ALIAS("ext2");
 125 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
 126 #else
 127 #define IS_EXT2_SB(sb) (0)
 128 #endif
 129
 130
 131 static struct file_system_type ext3_fs_type = {
 132         .owner          = THIS_MODULE,
 133         .name           = "ext3",
 134         .mount          = ext4_mount,
 135         .kill_sb        = kill_block_super,
 136         .fs_flags       = FS_REQUIRES_DEV,
 137 };
 138 MODULE_ALIAS_FS("ext3");
 139 MODULE_ALIAS("ext3");
 140 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
 141
 142
 143 static inline void __ext4_read_bh(struct buffer_head *bh, int op_flags,
 144                                   bh_end_io_t *end_io)
 145 {
 146         /*
 147          * buffer's verified bit is no longer valid after reading from
 148          * disk again due to write out error, clear it to make sure we
 149          * recheck the buffer contents.
 150          */
 151         clear_buffer_verified(bh);
 152
 153         bh->b_end_io = end_io ? end_io : end_buffer_read_sync;
 154         get_bh(bh);
 155         submit_bh(REQ_OP_READ, op_flags, bh);
 156 }
 157
 158 void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
 159                          bh_end_io_t *end_io)
 160 {
 161         BUG_ON(!buffer_locked(bh));
 162
 163         if (ext4_buffer_uptodate(bh)) {
 164                 unlock_buffer(bh);
 165                 return;
 166         }
 167         __ext4_read_bh(bh, op_flags, end_io);
 168 }
 169
 170 int ext4_read_bh(struct buffer_head *bh, int op_flags, bh_end_io_t *end_io)
 171 {
 172         BUG_ON(!buffer_locked(bh));
 173
 174         if (ext4_buffer_uptodate(bh)) {
 175                 unlock_buffer(bh);
 176                 return 0;
 177         }
 178
 179         __ext4_read_bh(bh, op_flags, end_io);
 180
 181         wait_on_buffer(bh);
 182         if (buffer_uptodate(bh))
 183                 return 0;
 184         return -EIO;
 185 }
 186
 187 int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait)
 188 {
 189         if (trylock_buffer(bh)) {
 190                 if (wait)
 191                         return ext4_read_bh(bh, op_flags, NULL);
 192                 ext4_read_bh_nowait(bh, op_flags, NULL);
 193                 return 0;
 194         }
 195         if (wait) {
 196                 wait_on_buffer(bh);
 197                 if (buffer_uptodate(bh))
 198                         return 0;
 199                 return -EIO;
 200         }
 201         return 0;
 202 }
 203
 204 /*
 205  * This works like __bread_gfp() except it uses ERR_PTR for error
 206  * returns.  Currently with sb_bread it's impossible to distinguish
 207  * between ENOMEM and EIO situations (since both result in a NULL
 208  * return.
 209  */
 210 static struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb,
 211                                                sector_t block, int op_flags,
 212                                                gfp_t gfp)
 213 {
 214         struct buffer_head *bh;
 215         int ret;
 216
 217         bh = sb_getblk_gfp(sb, block, gfp);
 218         if (bh == NULL)
 219                 return ERR_PTR(-ENOMEM);
 220         if (ext4_buffer_uptodate(bh))
 221                 return bh;
 222
 223         ret = ext4_read_bh_lock(bh, REQ_META | op_flags, true);
 224         if (ret) {
 225                 put_bh(bh);
 226                 return ERR_PTR(ret);
 227         }
 228         return bh;
 229 }
 230
 231 struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block,
 232                                    int op_flags)
 233 {
 234         return __ext4_sb_bread_gfp(sb, block, op_flags, __GFP_MOVABLE);
 235 }
 236
 237 struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
 238                                             sector_t block)
 239 {
 240         return __ext4_sb_bread_gfp(sb, block, 0, 0);
 241 }
 242
 243 void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block)
 244 {
 245         struct buffer_head *bh = sb_getblk_gfp(sb, block, 0);
 246
 247         if (likely(bh)) {
 248                 ext4_read_bh_lock(bh, REQ_RAHEAD, false);
 249                 brelse(bh);
 250         }
 251 }
 252
 253 static int ext4_verify_csum_type(struct super_block *sb,
 254                                  struct ext4_super_block *es)
 255 {
 256         if (!ext4_has_feature_metadata_csum(sb))
 257                 return 1;
 258
 259         return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
 260 }
 261
 262 static __le32 ext4_superblock_csum(struct super_block *sb,
 263                                    struct ext4_super_block *es)
 264 {
 265         struct ext4_sb_info *sbi = EXT4_SB(sb);
 266         int offset = offsetof(struct ext4_super_block, s_checksum);
 267         __u32 csum;
 268
 269         csum = ext4_chksum(sbi, ~0, (char *)es, offset);
 270
 271         return cpu_to_le32(csum);
 272 }
 273
 274 static int ext4_superblock_csum_verify(struct super_block *sb,
 275                                        struct ext4_super_block *es)
 276 {
 277         if (!ext4_has_metadata_csum(sb))
 278                 return 1;
 279
 280         return es->s_checksum == ext4_superblock_csum(sb, es);
 281 }
 282
 283 void ext4_superblock_csum_set(struct super_block *sb)
 284 {
 285         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
 286
 287         if (!ext4_has_metadata_csum(sb))
 288                 return;
 289
 290         es->s_checksum = ext4_superblock_csum(sb, es);
 291 }
 292
 293 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
 294                                struct ext4_group_desc *bg)
 295 {
 296         return le32_to_cpu(bg->bg_block_bitmap_lo) |
 297                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 298                  (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
 299 }
 300
 301 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
 302                                struct ext4_group_desc *bg)
 303 {
 304         return le32_to_cpu(bg->bg_inode_bitmap_lo) |
 305                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 306                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
 307 }
 308
 309 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
 310                               struct ext4_group_desc *bg)
 311 {
 312         return le32_to_cpu(bg->bg_inode_table_lo) |
 313                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 314                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
 315 }
 316
 317 __u32 ext4_free_group_clusters(struct super_block *sb,
 318                                struct ext4_group_desc *bg)
 319 {
 320         return le16_to_cpu(bg->bg_free_blocks_count_lo) |
 321                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 322                  (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
 323 }
 324
 325 __u32 ext4_free_inodes_count(struct super_block *sb,
 326                               struct ext4_group_desc *bg)
 327 {
 328         return le16_to_cpu(bg->bg_free_inodes_count_lo) |
 329                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 330                  (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
 331 }
 332
 333 __u32 ext4_used_dirs_count(struct super_block *sb,
 334                               struct ext4_group_desc *bg)
 335 {
 336         return le16_to_cpu(bg->bg_used_dirs_count_lo) |
 337                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 338                  (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
 339 }
 340
 341 __u32 ext4_itable_unused_count(struct super_block *sb,
 342                               struct ext4_group_desc *bg)
 343 {
 344         return le16_to_cpu(bg->bg_itable_unused_lo) |
 345                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 346                  (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
 347 }
 348
 349 void ext4_block_bitmap_set(struct super_block *sb,
 350                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
 351 {
 352         bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
 353         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 354                 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
 355 }
 356
 357 void ext4_inode_bitmap_set(struct super_block *sb,
 358                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
 359 {
 360         bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
 361         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 362                 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
 363 }
 364
 365 void ext4_inode_table_set(struct super_block *sb,
 366                           struct ext4_group_desc *bg, ext4_fsblk_t blk)
 367 {
 368         bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
 369         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 370                 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
 371 }
 372
 373 void ext4_free_group_clusters_set(struct super_block *sb,
 374                                   struct ext4_group_desc *bg, __u32 count)
 375 {
 376         bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
 377         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 378                 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
 379 }
 380
 381 void ext4_free_inodes_set(struct super_block *sb,
 382                           struct ext4_group_desc *bg, __u32 count)
 383 {
 384         bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
 385         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 386                 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
 387 }
 388
 389 void ext4_used_dirs_set(struct super_block *sb,
 390                           struct ext4_group_desc *bg, __u32 count)
 391 {
 392         bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
 393         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 394                 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
 395 }
 396
 397 void ext4_itable_unused_set(struct super_block *sb,
 398                           struct ext4_group_desc *bg, __u32 count)
 399 {
 400         bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
 401         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 402                 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
 403 }
 404
 405 static void __ext4_update_tstamp(__le32 *lo, __u8 *hi, time64_t now)
 406 {
 407         now = clamp_val(now, 0, (1ull << 40) - 1);
 408
 409         *lo = cpu_to_le32(lower_32_bits(now));
 410         *hi = upper_32_bits(now);
 411 }
 412
 413 static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
 414 {
 415         return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
 416 }
 417 #define ext4_update_tstamp(es, tstamp) \
 418         __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi, \
 419                              ktime_get_real_seconds())
 420 #define ext4_get_tstamp(es, tstamp) \
 421         __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
 422
 423 /*
 424  * The del_gendisk() function uninitializes the disk-specific data
 425  * structures, including the bdi structure, without telling anyone
 426  * else.  Once this happens, any attempt to call mark_buffer_dirty()
 427  * (for example, by ext4_commit_super), will cause a kernel OOPS.
 428  * This is a kludge to prevent these oops until we can put in a proper
 429  * hook in del_gendisk() to inform the VFS and file system layers.
 430  */
 431 static int block_device_ejected(struct super_block *sb)
 432 {
 433         struct inode *bd_inode = sb->s_bdev->bd_inode;
 434         struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
 435
 436         return bdi->dev == NULL;
 437 }
 438
 439 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
 440 {
 441         struct super_block              *sb = journal->j_private;
 442         struct ext4_sb_info             *sbi = EXT4_SB(sb);
 443         int                             error = is_journal_aborted(journal);
 444         struct ext4_journal_cb_entry    *jce;
 445
 446         BUG_ON(txn->t_state == T_FINISHED);
 447
 448         ext4_process_freed_data(sb, txn->t_tid);
 449
 450         spin_lock(&sbi->s_md_lock);
 451         while (!list_empty(&txn->t_private_list)) {
 452                 jce = list_entry(txn->t_private_list.next,
 453                                  struct ext4_journal_cb_entry, jce_list);
 454                 list_del_init(&jce->jce_list);
 455                 spin_unlock(&sbi->s_md_lock);
 456                 jce->jce_func(sb, jce, error);
 457                 spin_lock(&sbi->s_md_lock);
 458         }
 459         spin_unlock(&sbi->s_md_lock);
 460 }
 461
 462 /*
 463  * This writepage callback for write_cache_pages()
 464  * takes care of a few cases after page cleaning.
 465  *
 466  * write_cache_pages() already checks for dirty pages
 467  * and calls clear_page_dirty_for_io(), which we want,
 468  * to write protect the pages.
 469  *
 470  * However, we may have to redirty a page (see below.)
 471  */
 472 static int ext4_journalled_writepage_callback(struct page *page,
 473                                               struct writeback_control *wbc,
 474                                               void *data)
 475 {
 476         transaction_t *transaction = (transaction_t *) data;
 477         struct buffer_head *bh, *head;
 478         struct journal_head *jh;
 479
 480         bh = head = page_buffers(page);
 481         do {
 482                 /*
 483                  * We have to redirty a page in these cases:
 484                  * 1) If buffer is dirty, it means the page was dirty because it
 485                  * contains a buffer that needs checkpointing. So the dirty bit
 486                  * needs to be preserved so that checkpointing writes the buffer
 487                  * properly.
 488                  * 2) If buffer is not part of the committing transaction
 489                  * (we may have just accidentally come across this buffer because
 490                  * inode range tracking is not exact) or if the currently running
 491                  * transaction already contains this buffer as well, dirty bit
 492                  * needs to be preserved so that the buffer gets writeprotected
 493                  * properly on running transaction's commit.
 494                  */
 495                 jh = bh2jh(bh);
 496                 if (buffer_dirty(bh) ||
 497                     (jh && (jh->b_transaction != transaction ||
 498                             jh->b_next_transaction))) {
 499                         redirty_page_for_writepage(wbc, page);
 500                         goto out;
 501                 }
 502         } while ((bh = bh->b_this_page) != head);
 503
 504 out:
 505         return AOP_WRITEPAGE_ACTIVATE;
 506 }
 507
 508 static int ext4_journalled_submit_inode_data_buffers(struct jbd2_inode *jinode)
 509 {
 510         struct address_space *mapping = jinode->i_vfs_inode->i_mapping;
 511         struct writeback_control wbc = {
 512                 .sync_mode =  WB_SYNC_ALL,
 513                 .nr_to_write = LONG_MAX,
 514                 .range_start = jinode->i_dirty_start,
 515                 .range_end = jinode->i_dirty_end,
 516         };
 517
 518         return write_cache_pages(mapping, &wbc,
 519                                  ext4_journalled_writepage_callback,
 520                                  jinode->i_transaction);
 521 }
 522
 523 static int ext4_journal_submit_inode_data_buffers(struct jbd2_inode *jinode)
 524 {
 525         int ret;
 526
 527         if (ext4_should_journal_data(jinode->i_vfs_inode))
 528                 ret = ext4_journalled_submit_inode_data_buffers(jinode);
 529         else
 530                 ret = jbd2_journal_submit_inode_data_buffers(jinode);
 531
 532         return ret;
 533 }
 534
 535 static int ext4_journal_finish_inode_data_buffers(struct jbd2_inode *jinode)
 536 {
 537         int ret = 0;
 538
 539         if (!ext4_should_journal_data(jinode->i_vfs_inode))
 540                 ret = jbd2_journal_finish_inode_data_buffers(jinode);
 541
 542         return ret;
 543 }
 544
 545 static bool system_going_down(void)
 546 {
 547         return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
 548                 || system_state == SYSTEM_RESTART;
 549 }
 550
 551 struct ext4_err_translation {
 552         int code;
 553         int errno;
 554 };
 555
 556 #define EXT4_ERR_TRANSLATE(err) { .code = EXT4_ERR_##err, .errno = err }
 557
 558 static struct ext4_err_translation err_translation[] = {
 559         EXT4_ERR_TRANSLATE(EIO),
 560         EXT4_ERR_TRANSLATE(ENOMEM),
 561         EXT4_ERR_TRANSLATE(EFSBADCRC),
 562         EXT4_ERR_TRANSLATE(EFSCORRUPTED),
 563         EXT4_ERR_TRANSLATE(ENOSPC),
 564         EXT4_ERR_TRANSLATE(ENOKEY),
 565         EXT4_ERR_TRANSLATE(EROFS),
 566         EXT4_ERR_TRANSLATE(EFBIG),
 567         EXT4_ERR_TRANSLATE(EEXIST),
 568         EXT4_ERR_TRANSLATE(ERANGE),
 569         EXT4_ERR_TRANSLATE(EOVERFLOW),
 570         EXT4_ERR_TRANSLATE(EBUSY),
 571         EXT4_ERR_TRANSLATE(ENOTDIR),
 572         EXT4_ERR_TRANSLATE(ENOTEMPTY),
 573         EXT4_ERR_TRANSLATE(ESHUTDOWN),
 574         EXT4_ERR_TRANSLATE(EFAULT),
 575 };
 576
 577 static int ext4_errno_to_code(int errno)
 578 {
 579         int i;
 580
 581         for (i = 0; i < ARRAY_SIZE(err_translation); i++)
 582                 if (err_translation[i].errno == errno)
 583                         return err_translation[i].code;
 584         return EXT4_ERR_UNKNOWN;
 585 }
 586
 587 static void save_error_info(struct super_block *sb, int error,
 588                             __u32 ino, __u64 block,
 589                             const char *func, unsigned int line)
 590 {
 591         struct ext4_sb_info *sbi = EXT4_SB(sb);
 592
 593         /* We default to EFSCORRUPTED error... */
 594         if (error == 0)
 595                 error = EFSCORRUPTED;
 596
 597         spin_lock(&sbi->s_error_lock);
 598         sbi->s_add_error_count++;
 599         sbi->s_last_error_code = error;
 600         sbi->s_last_error_line = line;
 601         sbi->s_last_error_ino = ino;
 602         sbi->s_last_error_block = block;
 603         sbi->s_last_error_func = func;
 604         sbi->s_last_error_time = ktime_get_real_seconds();
 605         if (!sbi->s_first_error_time) {
 606                 sbi->s_first_error_code = error;
 607                 sbi->s_first_error_line = line;
 608                 sbi->s_first_error_ino = ino;
 609                 sbi->s_first_error_block = block;
 610                 sbi->s_first_error_func = func;
 611                 sbi->s_first_error_time = sbi->s_last_error_time;
 612         }
 613         spin_unlock(&sbi->s_error_lock);
 614 }
 615
 616 /* Deal with the reporting of failure conditions on a filesystem such as
 617  * inconsistencies detected or read IO failures.
 618  *
 619  * On ext2, we can store the error state of the filesystem in the
 620  * superblock.  That is not possible on ext4, because we may have other
 621  * write ordering constraints on the superblock which prevent us from
 622  * writing it out straight away; and given that the journal is about to
 623  * be aborted, we can't rely on the current, or future, transactions to
 624  * write out the superblock safely.
 625  *
 626  * We'll just use the jbd2_journal_abort() error code to record an error in
 627  * the journal instead.  On recovery, the journal will complain about
 628  * that error until we've noted it down and cleared it.
 629  *
 630  * If force_ro is set, we unconditionally force the filesystem into an
 631  * ABORT|READONLY state, unless the error response on the fs has been set to
 632  * panic in which case we take the easy way out and panic immediately. This is
 633  * used to deal with unrecoverable failures such as journal IO errors or ENOMEM
 634  * at a critical moment in log management.
 635  */
 636 static void ext4_handle_error(struct super_block *sb, bool force_ro, int error,
 637                               __u32 ino, __u64 block,
 638                               const char *func, unsigned int line)
 639 {
 640         journal_t *journal = EXT4_SB(sb)->s_journal;
 641         bool continue_fs = !force_ro && test_opt(sb, ERRORS_CONT);
 642
 643         EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
 644         if (test_opt(sb, WARN_ON_ERROR))
 645                 WARN_ON_ONCE(1);
 646
 647         if (!continue_fs && !sb_rdonly(sb)) {
 648                 ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED);
 649                 if (journal)
 650                         jbd2_journal_abort(journal, -EIO);
 651         }
 652
 653         if (!bdev_read_only(sb->s_bdev)) {
 654                 save_error_info(sb, error, ino, block, func, line);
 655                 /*
 656                  * In case the fs should keep running, we need to writeout
 657                  * superblock through the journal. Due to lock ordering
 658                  * constraints, it may not be safe to do it right here so we
 659                  * defer superblock flushing to a workqueue.
 660                  */
 661                 if (continue_fs && journal)
 662                         schedule_work(&EXT4_SB(sb)->s_error_work);
 663                 else
 664                         ext4_commit_super(sb);
 665         }
 666
 667         /*
 668          * We force ERRORS_RO behavior when system is rebooting. Otherwise we
 669          * could panic during 'reboot -f' as the underlying device got already
 670          * disabled.
 671          */
 672         if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
 673                 panic("EXT4-fs (device %s): panic forced after error\n",
 674                         sb->s_id);
 675         }
 676
 677         if (sb_rdonly(sb) || continue_fs)
 678                 return;
 679
 680         ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
 681         /*
 682          * Make sure updated value of ->s_mount_flags will be visible before
 683          * ->s_flags update
 684          */
 685         smp_wmb();
 686         sb->s_flags |= SB_RDONLY;
 687 }
 688
 689 static void flush_stashed_error_work(struct work_struct *work)
 690 {
 691         struct ext4_sb_info *sbi = container_of(work, struct ext4_sb_info,
 692                                                 s_error_work);
 693         journal_t *journal = sbi->s_journal;
 694         handle_t *handle;
 695
 696         /*
 697          * If the journal is still running, we have to write out superblock
 698          * through the journal to avoid collisions of other journalled sb
 699          * updates.
 700          *
 701          * We use directly jbd2 functions here to avoid recursing back into
 702          * ext4 error handling code during handling of previous errors.
 703          */
 704         if (!sb_rdonly(sbi->s_sb) && journal) {
 705                 struct buffer_head *sbh = sbi->s_sbh;
 706                 handle = jbd2_journal_start(journal, 1);
 707                 if (IS_ERR(handle))
 708                         goto write_directly;
 709                 if (jbd2_journal_get_write_access(handle, sbh)) {
 710                         jbd2_journal_stop(handle);
 711                         goto write_directly;
 712                 }
 713                 ext4_update_super(sbi->s_sb);
 714                 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
 715                         ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to "
 716                                  "superblock detected");
 717                         clear_buffer_write_io_error(sbh);
 718                         set_buffer_uptodate(sbh);
 719                 }
 720
 721                 if (jbd2_journal_dirty_metadata(handle, sbh)) {
 722                         jbd2_journal_stop(handle);
 723                         goto write_directly;
 724                 }
 725                 jbd2_journal_stop(handle);
 726                 ext4_notify_error_sysfs(sbi);
 727                 return;
 728         }
 729 write_directly:
 730         /*
 731          * Write through journal failed. Write sb directly to get error info
 732          * out and hope for the best.
 733          */
 734         ext4_commit_super(sbi->s_sb);
 735         ext4_notify_error_sysfs(sbi);
 736 }
 737
 738 #define ext4_error_ratelimit(sb)                                        \
 739                 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state),     \
 740                              "EXT4-fs error")
 741
 742 void __ext4_error(struct super_block *sb, const char *function,
 743                   unsigned int line, bool force_ro, int error, __u64 block,
 744                   const char *fmt, ...)
 745 {
 746         struct va_format vaf;
 747         va_list args;
 748
 749         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 750                 return;
 751
 752         trace_ext4_error(sb, function, line);
 753         if (ext4_error_ratelimit(sb)) {
 754                 va_start(args, fmt);
 755                 vaf.fmt = fmt;
 756                 vaf.va = &args;
 757                 printk(KERN_CRIT
 758                        "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
 759                        sb->s_id, function, line, current->comm, &vaf);
 760                 va_end(args);
 761         }
 762         ext4_handle_error(sb, force_ro, error, 0, block, function, line);
 763 }
 764
 765 void __ext4_error_inode(struct inode *inode, const char *function,
 766                         unsigned int line, ext4_fsblk_t block, int error,
 767                         const char *fmt, ...)
 768 {
 769         va_list args;
 770         struct va_format vaf;
 771
 772         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 773                 return;
 774
 775         trace_ext4_error(inode->i_sb, function, line);
 776         if (ext4_error_ratelimit(inode->i_sb)) {
 777                 va_start(args, fmt);
 778                 vaf.fmt = fmt;
 779                 vaf.va = &args;
 780                 if (block)
 781                         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
 782                                "inode #%lu: block %llu: comm %s: %pV\n",
 783                                inode->i_sb->s_id, function, line, inode->i_ino,
 784                                block, current->comm, &vaf);
 785                 else
 786                         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
 787                                "inode #%lu: comm %s: %pV\n",
 788                                inode->i_sb->s_id, function, line, inode->i_ino,
 789                                current->comm, &vaf);
 790                 va_end(args);
 791         }
 792         ext4_handle_error(inode->i_sb, false, error, inode->i_ino, block,
 793                           function, line);
 794 }
 795
 796 void __ext4_error_file(struct file *file, const char *function,
 797                        unsigned int line, ext4_fsblk_t block,
 798                        const char *fmt, ...)
 799 {
 800         va_list args;
 801         struct va_format vaf;
 802         struct inode *inode = file_inode(file);
 803         char pathname[80], *path;
 804
 805         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 806                 return;
 807
 808         trace_ext4_error(inode->i_sb, function, line);
 809         if (ext4_error_ratelimit(inode->i_sb)) {
 810                 path = file_path(file, pathname, sizeof(pathname));
 811                 if (IS_ERR(path))
 812                         path = "(unknown)";
 813                 va_start(args, fmt);
 814                 vaf.fmt = fmt;
 815                 vaf.va = &args;
 816                 if (block)
 817                         printk(KERN_CRIT
 818                                "EXT4-fs error (device %s): %s:%d: inode #%lu: "
 819                                "block %llu: comm %s: path %s: %pV\n",
 820                                inode->i_sb->s_id, function, line, inode->i_ino,
 821                                block, current->comm, path, &vaf);
 822                 else
 823                         printk(KERN_CRIT
 824                                "EXT4-fs error (device %s): %s:%d: inode #%lu: "
 825                                "comm %s: path %s: %pV\n",
 826                                inode->i_sb->s_id, function, line, inode->i_ino,
 827                                current->comm, path, &vaf);
 828                 va_end(args);
 829         }
 830         ext4_handle_error(inode->i_sb, false, EFSCORRUPTED, inode->i_ino, block,
 831                           function, line);
 832 }
 833
 834 const char *ext4_decode_error(struct super_block *sb, int errno,
 835                               char nbuf[16])
 836 {
 837         char *errstr = NULL;
 838
 839         switch (errno) {
 840         case -EFSCORRUPTED:
 841                 errstr = "Corrupt filesystem";
 842                 break;
 843         case -EFSBADCRC:
 844                 errstr = "Filesystem failed CRC";
 845                 break;
 846         case -EIO:
 847                 errstr = "IO failure";
 848                 break;
 849         case -ENOMEM:
 850                 errstr = "Out of memory";
 851                 break;
 852         case -EROFS:
 853                 if (!sb || (EXT4_SB(sb)->s_journal &&
 854                             EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
 855                         errstr = "Journal has aborted";
 856                 else
 857                         errstr = "Readonly filesystem";
 858                 break;
 859         default:
 860                 /* If the caller passed in an extra buffer for unknown
 861                  * errors, textualise them now.  Else we just return
 862                  * NULL. */
 863                 if (nbuf) {
 864                         /* Check for truncated error codes... */
 865                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 866                                 errstr = nbuf;
 867                 }
 868                 break;
 869         }
 870
 871         return errstr;
 872 }
 873
 874 /* __ext4_std_error decodes expected errors from journaling functions
 875  * automatically and invokes the appropriate error response.  */
 876
 877 void __ext4_std_error(struct super_block *sb, const char *function,
 878                       unsigned int line, int errno)
 879 {
 880         char nbuf[16];
 881         const char *errstr;
 882
 883         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 884                 return;
 885
 886         /* Special case: if the error is EROFS, and we're not already
 887          * inside a transaction, then there's really no point in logging
 888          * an error. */
 889         if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
 890                 return;
 891
 892         if (ext4_error_ratelimit(sb)) {
 893                 errstr = ext4_decode_error(sb, errno, nbuf);
 894                 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
 895                        sb->s_id, function, line, errstr);
 896         }
 897
 898         ext4_handle_error(sb, false, -errno, 0, 0, function, line);
 899 }
 900
 901 void __ext4_msg(struct super_block *sb,
 902                 const char *prefix, const char *fmt, ...)
 903 {
 904         struct va_format vaf;
 905         va_list args;
 906
 907         atomic_inc(&EXT4_SB(sb)->s_msg_count);
 908         if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
 909                 return;
 910
 911         va_start(args, fmt);
 912         vaf.fmt = fmt;
 913         vaf.va = &args;
 914         printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
 915         va_end(args);
 916 }
 917
 918 static int ext4_warning_ratelimit(struct super_block *sb)
 919 {
 920         atomic_inc(&EXT4_SB(sb)->s_warning_count);
 921         return ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
 922                             "EXT4-fs warning");
 923 }
 924
 925 void __ext4_warning(struct super_block *sb, const char *function,
 926                     unsigned int line, const char *fmt, ...)
 927 {
 928         struct va_format vaf;
 929         va_list args;
 930
 931         if (!ext4_warning_ratelimit(sb))
 932                 return;
 933
 934         va_start(args, fmt);
 935         vaf.fmt = fmt;
 936         vaf.va = &args;
 937         printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
 938                sb->s_id, function, line, &vaf);
 939         va_end(args);
 940 }
 941
 942 void __ext4_warning_inode(const struct inode *inode, const char *function,
 943                           unsigned int line, const char *fmt, ...)
 944 {
 945         struct va_format vaf;
 946         va_list args;
 947
 948         if (!ext4_warning_ratelimit(inode->i_sb))
 949                 return;
 950
 951         va_start(args, fmt);
 952         vaf.fmt = fmt;
 953         vaf.va = &args;
 954         printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
 955                "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
 956                function, line, inode->i_ino, current->comm, &vaf);
 957         va_end(args);
 958 }
 959
 960 void __ext4_grp_locked_error(const char *function, unsigned int line,
 961                              struct super_block *sb, ext4_group_t grp,
 962                              unsigned long ino, ext4_fsblk_t block,
 963                              const char *fmt, ...)
 964 __releases(bitlock)
 965 __acquires(bitlock)
 966 {
 967         struct va_format vaf;
 968         va_list args;
 969
 970         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 971                 return;
 972
 973         trace_ext4_error(sb, function, line);
 974         if (ext4_error_ratelimit(sb)) {
 975                 va_start(args, fmt);
 976                 vaf.fmt = fmt;
 977                 vaf.va = &args;
 978                 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
 979                        sb->s_id, function, line, grp);
 980                 if (ino)
 981                         printk(KERN_CONT "inode %lu: ", ino);
 982                 if (block)
 983                         printk(KERN_CONT "block %llu:",
 984                                (unsigned long long) block);
 985                 printk(KERN_CONT "%pV\n", &vaf);
 986                 va_end(args);
 987         }
 988
 989         if (test_opt(sb, ERRORS_CONT)) {
 990                 if (test_opt(sb, WARN_ON_ERROR))
 991                         WARN_ON_ONCE(1);
 992                 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
 993                 if (!bdev_read_only(sb->s_bdev)) {
 994                         save_error_info(sb, EFSCORRUPTED, ino, block, function,
 995                                         line);
 996                         schedule_work(&EXT4_SB(sb)->s_error_work);
 997                 }
 998                 return;
 999         }
1000         ext4_unlock_group(sb, grp);
1001         ext4_handle_error(sb, false, EFSCORRUPTED, ino, block, function, line);
1002         /*
1003          * We only get here in the ERRORS_RO case; relocking the group
1004          * may be dangerous, but nothing bad will happen since the
1005          * filesystem will have already been marked read/only and the
1006          * journal has been aborted.  We return 1 as a hint to callers
1007          * who might what to use the return value from
1008          * ext4_grp_locked_error() to distinguish between the
1009          * ERRORS_CONT and ERRORS_RO case, and perhaps return more
1010          * aggressively from the ext4 function in question, with a
1011          * more appropriate error code.
1012          */
1013         ext4_lock_group(sb, grp);
1014         return;
1015 }
1016
1017 void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
1018                                      ext4_group_t group,
1019                                      unsigned int flags)
1020 {
1021         struct ext4_sb_info *sbi = EXT4_SB(sb);
1022         struct ext4_group_info *grp = ext4_get_group_info(sb, group);
1023         struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
1024         int ret;
1025
1026         if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
1027                 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
1028                                             &grp->bb_state);
1029                 if (!ret)
1030                         percpu_counter_sub(&sbi->s_freeclusters_counter,
1031                                            grp->bb_free);
1032         }
1033
1034         if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
1035                 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
1036                                             &grp->bb_state);
1037                 if (!ret && gdp) {
1038                         int count;
1039
1040                         count = ext4_free_inodes_count(sb, gdp);
1041                         percpu_counter_sub(&sbi->s_freeinodes_counter,
1042                                            count);
1043                 }
1044         }
1045 }
1046
1047 void ext4_update_dynamic_rev(struct super_block *sb)
1048 {
1049         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1050
1051         if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
1052                 return;
1053
1054         ext4_warning(sb,
1055                      "updating to rev %d because of new feature flag, "
1056                      "running e2fsck is recommended",
1057                      EXT4_DYNAMIC_REV);
1058
1059         es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
1060         es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
1061         es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
1062         /* leave es->s_feature_*compat flags alone */
1063         /* es->s_uuid will be set by e2fsck if empty */
1064
1065         /*
1066          * The rest of the superblock fields should be zero, and if not it
1067          * means they are likely already in use, so leave them alone.  We
1068          * can leave it up to e2fsck to clean up any inconsistencies there.
1069          */
1070 }
1071
1072 /*
1073  * Open the external journal device
1074  */
1075 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
1076 {
1077         struct block_device *bdev;
1078
1079         bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
1080         if (IS_ERR(bdev))
1081                 goto fail;
1082         return bdev;
1083
1084 fail:
1085         ext4_msg(sb, KERN_ERR,
1086                  "failed to open journal device unknown-block(%u,%u) %ld",
1087                  MAJOR(dev), MINOR(dev), PTR_ERR(bdev));
1088         return NULL;
1089 }
1090
1091 /*
1092  * Release the journal device
1093  */
1094 static void ext4_blkdev_put(struct block_device *bdev)
1095 {
1096         blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1097 }
1098
1099 static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
1100 {
1101         struct block_device *bdev;
1102         bdev = sbi->s_journal_bdev;
1103         if (bdev) {
1104                 ext4_blkdev_put(bdev);
1105                 sbi->s_journal_bdev = NULL;
1106         }
1107 }
1108
1109 static inline struct inode *orphan_list_entry(struct list_head *l)
1110 {
1111         return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
1112 }
1113
1114 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
1115 {
1116         struct list_head *l;
1117
1118         ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
1119                  le32_to_cpu(sbi->s_es->s_last_orphan));
1120
1121         printk(KERN_ERR "sb_info orphan list:\n");
1122         list_for_each(l, &sbi->s_orphan) {
1123                 struct inode *inode = orphan_list_entry(l);
1124                 printk(KERN_ERR "  "
1125                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1126                        inode->i_sb->s_id, inode->i_ino, inode,
1127                        inode->i_mode, inode->i_nlink,
1128                        NEXT_ORPHAN(inode));
1129         }
1130 }
1131
1132 #ifdef CONFIG_QUOTA
1133 static int ext4_quota_off(struct super_block *sb, int type);
1134
1135 static inline void ext4_quota_off_umount(struct super_block *sb)
1136 {
1137         int type;
1138
1139         /* Use our quota_off function to clear inode flags etc. */
1140         for (type = 0; type < EXT4_MAXQUOTAS; type++)
1141                 ext4_quota_off(sb, type);
1142 }
1143
1144 /*
1145  * This is a helper function which is used in the mount/remount
1146  * codepaths (which holds s_umount) to fetch the quota file name.
1147  */
1148 static inline char *get_qf_name(struct super_block *sb,
1149                                 struct ext4_sb_info *sbi,
1150                                 int type)
1151 {
1152         return rcu_dereference_protected(sbi->s_qf_names[type],
1153                                          lockdep_is_held(&sb->s_umount));
1154 }
1155 #else
1156 static inline void ext4_quota_off_umount(struct super_block *sb)
1157 {
1158 }
1159 #endif
1160
1161 static void ext4_put_super(struct super_block *sb)
1162 {
1163         struct ext4_sb_info *sbi = EXT4_SB(sb);
1164         struct ext4_super_block *es = sbi->s_es;
1165         struct buffer_head **group_desc;
1166         struct flex_groups **flex_groups;
1167         int aborted = 0;
1168         int i, err;
1169
1170         ext4_unregister_li_request(sb);
1171         ext4_quota_off_umount(sb);
1172
1173         flush_work(&sbi->s_error_work);
1174         destroy_workqueue(sbi->rsv_conversion_wq);
1175         ext4_release_orphan_info(sb);
1176
1177         /*
1178          * Unregister sysfs before destroying jbd2 journal.
1179          * Since we could still access attr_journal_task attribute via sysfs
1180          * path which could have sbi->s_journal->j_task as NULL
1181          */
1182         ext4_unregister_sysfs(sb);
1183
1184         if (sbi->s_journal) {
1185                 aborted = is_journal_aborted(sbi->s_journal);
1186                 err = jbd2_journal_destroy(sbi->s_journal);
1187                 sbi->s_journal = NULL;
1188                 if ((err < 0) && !aborted) {
1189                         ext4_abort(sb, -err, "Couldn't clean up the journal");
1190                 }
1191         }
1192
1193         ext4_es_unregister_shrinker(sbi);
1194         del_timer_sync(&sbi->s_err_report);
1195         ext4_release_system_zone(sb);
1196         ext4_mb_release(sb);
1197         ext4_ext_release(sb);
1198
1199         if (!sb_rdonly(sb) && !aborted) {
1200                 ext4_clear_feature_journal_needs_recovery(sb);
1201                 ext4_clear_feature_orphan_present(sb);
1202                 es->s_state = cpu_to_le16(sbi->s_mount_state);
1203         }
1204         if (!sb_rdonly(sb))
1205                 ext4_commit_super(sb);
1206
1207         rcu_read_lock();
1208         group_desc = rcu_dereference(sbi->s_group_desc);
1209         for (i = 0; i < sbi->s_gdb_count; i++)
1210                 brelse(group_desc[i]);
1211         kvfree(group_desc);
1212         flex_groups = rcu_dereference(sbi->s_flex_groups);
1213         if (flex_groups) {
1214                 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
1215                         kvfree(flex_groups[i]);
1216                 kvfree(flex_groups);
1217         }
1218         rcu_read_unlock();
1219         percpu_counter_destroy(&sbi->s_freeclusters_counter);
1220         percpu_counter_destroy(&sbi->s_freeinodes_counter);
1221         percpu_counter_destroy(&sbi->s_dirs_counter);
1222         percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1223         percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit);
1224         percpu_free_rwsem(&sbi->s_writepages_rwsem);
1225 #ifdef CONFIG_QUOTA
1226         for (i = 0; i < EXT4_MAXQUOTAS; i++)
1227                 kfree(get_qf_name(sb, sbi, i));
1228 #endif
1229
1230         /* Debugging code just in case the in-memory inode orphan list
1231          * isn't empty.  The on-disk one can be non-empty if we've
1232          * detected an error and taken the fs readonly, but the
1233          * in-memory list had better be clean by this point. */
1234         if (!list_empty(&sbi->s_orphan))
1235                 dump_orphan_list(sb, sbi);
1236         ASSERT(list_empty(&sbi->s_orphan));
1237
1238         sync_blockdev(sb->s_bdev);
1239         invalidate_bdev(sb->s_bdev);
1240         if (sbi->s_journal_bdev && sbi->s_journal_bdev != sb->s_bdev) {
1241                 /*
1242                  * Invalidate the journal device's buffers.  We don't want them
1243                  * floating about in memory - the physical journal device may
1244                  * hotswapped, and it breaks the `ro-after' testing code.
1245                  */
1246                 sync_blockdev(sbi->s_journal_bdev);
1247                 invalidate_bdev(sbi->s_journal_bdev);
1248                 ext4_blkdev_remove(sbi);
1249         }
1250
1251         ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1252         sbi->s_ea_inode_cache = NULL;
1253
1254         ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1255         sbi->s_ea_block_cache = NULL;
1256
1257         ext4_stop_mmpd(sbi);
1258
1259         brelse(sbi->s_sbh);
1260         sb->s_fs_info = NULL;
1261         /*
1262          * Now that we are completely done shutting down the
1263          * superblock, we need to actually destroy the kobject.
1264          */
1265         kobject_put(&sbi->s_kobj);
1266         wait_for_completion(&sbi->s_kobj_unregister);
1267         if (sbi->s_chksum_driver)
1268                 crypto_free_shash(sbi->s_chksum_driver);
1269         kfree(sbi->s_blockgroup_lock);
1270         fs_put_dax(sbi->s_daxdev);
1271         fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
1272 #ifdef CONFIG_UNICODE
1273         utf8_unload(sb->s_encoding);
1274 #endif
1275         kfree(sbi);
1276 }
1277
1278 static struct kmem_cache *ext4_inode_cachep;
1279
1280 /*
1281  * Called inside transaction, so use GFP_NOFS
1282  */
1283 static struct inode *ext4_alloc_inode(struct super_block *sb)
1284 {
1285         struct ext4_inode_info *ei;
1286
1287         ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
1288         if (!ei)
1289                 return NULL;
1290
1291         inode_set_iversion(&ei->vfs_inode, 1);
1292         spin_lock_init(&ei->i_raw_lock);
1293         INIT_LIST_HEAD(&ei->i_prealloc_list);
1294         atomic_set(&ei->i_prealloc_active, 0);
1295         spin_lock_init(&ei->i_prealloc_lock);
1296         ext4_es_init_tree(&ei->i_es_tree);
1297         rwlock_init(&ei->i_es_lock);
1298         INIT_LIST_HEAD(&ei->i_es_list);
1299         ei->i_es_all_nr = 0;
1300         ei->i_es_shk_nr = 0;
1301         ei->i_es_shrink_lblk = 0;
1302         ei->i_reserved_data_blocks = 0;
1303         spin_lock_init(&(ei->i_block_reservation_lock));
1304         ext4_init_pending_tree(&ei->i_pending_tree);
1305 #ifdef CONFIG_QUOTA
1306         ei->i_reserved_quota = 0;
1307         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
1308 #endif
1309         ei->jinode = NULL;
1310         INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
1311         spin_lock_init(&ei->i_completed_io_lock);
1312         ei->i_sync_tid = 0;
1313         ei->i_datasync_tid = 0;
1314         atomic_set(&ei->i_unwritten, 0);
1315         INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
1316         ext4_fc_init_inode(&ei->vfs_inode);
1317         mutex_init(&ei->i_fc_lock);
1318         return &ei->vfs_inode;
1319 }
1320
1321 static int ext4_drop_inode(struct inode *inode)
1322 {
1323         int drop = generic_drop_inode(inode);
1324
1325         if (!drop)
1326                 drop = fscrypt_drop_inode(inode);
1327
1328         trace_ext4_drop_inode(inode, drop);
1329         return drop;
1330 }
1331
1332 static void ext4_free_in_core_inode(struct inode *inode)
1333 {
1334         fscrypt_free_inode(inode);
1335         if (!list_empty(&(EXT4_I(inode)->i_fc_list))) {
1336                 pr_warn("%s: inode %ld still in fc list",
1337                         __func__, inode->i_ino);
1338         }
1339         kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1340 }
1341
1342 static void ext4_destroy_inode(struct inode *inode)
1343 {
1344         if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
1345                 ext4_msg(inode->i_sb, KERN_ERR,
1346                          "Inode %lu (%p): orphan list check failed!",
1347                          inode->i_ino, EXT4_I(inode));
1348                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1349                                 EXT4_I(inode), sizeof(struct ext4_inode_info),
1350                                 true);
1351                 dump_stack();
1352         }
1353
1354         if (EXT4_I(inode)->i_reserved_data_blocks)
1355                 ext4_msg(inode->i_sb, KERN_ERR,
1356                          "Inode %lu (%p): i_reserved_data_blocks (%u) not cleared!",
1357                          inode->i_ino, EXT4_I(inode),
1358                          EXT4_I(inode)->i_reserved_data_blocks);
1359 }
1360
1361 static void init_once(void *foo)
1362 {
1363         struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
1364
1365         INIT_LIST_HEAD(&ei->i_orphan);
1366         init_rwsem(&ei->xattr_sem);
1367         init_rwsem(&ei->i_data_sem);
1368         inode_init_once(&ei->vfs_inode);
1369         ext4_fc_init_inode(&ei->vfs_inode);
1370 }
1371
1372 static int __init init_inodecache(void)
1373 {
1374         ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1375                                 sizeof(struct ext4_inode_info), 0,
1376                                 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1377                                         SLAB_ACCOUNT),
1378                                 offsetof(struct ext4_inode_info, i_data),
1379                                 sizeof_field(struct ext4_inode_info, i_data),
1380                                 init_once);
1381         if (ext4_inode_cachep == NULL)
1382                 return -ENOMEM;
1383         return 0;
1384 }
1385
1386 static void destroy_inodecache(void)
1387 {
1388         /*
1389          * Make sure all delayed rcu free inodes are flushed before we
1390          * destroy cache.
1391          */
1392         rcu_barrier();
1393         kmem_cache_destroy(ext4_inode_cachep);
1394 }
1395
1396 void ext4_clear_inode(struct inode *inode)
1397 {
1398         ext4_fc_del(inode);
1399         invalidate_inode_buffers(inode);
1400         clear_inode(inode);
1401         ext4_discard_preallocations(inode, 0);
1402         ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1403         dquot_drop(inode);
1404         if (EXT4_I(inode)->jinode) {
1405                 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1406                                                EXT4_I(inode)->jinode);
1407                 jbd2_free_inode(EXT4_I(inode)->jinode);
1408                 EXT4_I(inode)->jinode = NULL;
1409         }
1410         fscrypt_put_encryption_info(inode);
1411         fsverity_cleanup_inode(inode);
1412 }
1413
1414 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1415                                         u64 ino, u32 generation)
1416 {
1417         struct inode *inode;
1418
1419         /*
1420          * Currently we don't know the generation for parent directory, so
1421          * a generation of 0 means "accept any"
1422          */
1423         inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1424         if (IS_ERR(inode))
1425                 return ERR_CAST(inode);
1426         if (generation && inode->i_generation != generation) {
1427                 iput(inode);
1428                 return ERR_PTR(-ESTALE);
1429         }
1430
1431         return inode;
1432 }
1433
1434 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1435                                         int fh_len, int fh_type)
1436 {
1437         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1438                                     ext4_nfs_get_inode);
1439 }
1440
1441 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1442                                         int fh_len, int fh_type)
1443 {
1444         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1445                                     ext4_nfs_get_inode);
1446 }
1447
1448 static int ext4_nfs_commit_metadata(struct inode *inode)
1449 {
1450         struct writeback_control wbc = {
1451                 .sync_mode = WB_SYNC_ALL
1452         };
1453
1454         trace_ext4_nfs_commit_metadata(inode);
1455         return ext4_write_inode(inode, &wbc);
1456 }
1457
1458 #ifdef CONFIG_FS_ENCRYPTION
1459 static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1460 {
1461         return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1462                                  EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1463 }
1464
1465 static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1466                                                         void *fs_data)
1467 {
1468         handle_t *handle = fs_data;
1469         int res, res2, credits, retries = 0;
1470
1471         /*
1472          * Encrypting the root directory is not allowed because e2fsck expects
1473          * lost+found to exist and be unencrypted, and encrypting the root
1474          * directory would imply encrypting the lost+found directory as well as
1475          * the filename "lost+found" itself.
1476          */
1477         if (inode->i_ino == EXT4_ROOT_INO)
1478                 return -EPERM;
1479
1480         if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1481                 return -EINVAL;
1482
1483         if (ext4_test_inode_flag(inode, EXT4_INODE_DAX))
1484                 return -EOPNOTSUPP;
1485
1486         res = ext4_convert_inline_data(inode);
1487         if (res)
1488                 return res;
1489
1490         /*
1491          * If a journal handle was specified, then the encryption context is
1492          * being set on a new inode via inheritance and is part of a larger
1493          * transaction to create the inode.  Otherwise the encryption context is
1494          * being set on an existing inode in its own transaction.  Only in the
1495          * latter case should the "retry on ENOSPC" logic be used.
1496          */
1497
1498         if (handle) {
1499                 res = ext4_xattr_set_handle(handle, inode,
1500                                             EXT4_XATTR_INDEX_ENCRYPTION,
1501                                             EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1502                                             ctx, len, 0);
1503                 if (!res) {
1504                         ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1505                         ext4_clear_inode_state(inode,
1506                                         EXT4_STATE_MAY_INLINE_DATA);
1507                         /*
1508                          * Update inode->i_flags - S_ENCRYPTED will be enabled,
1509                          * S_DAX may be disabled
1510                          */
1511                         ext4_set_inode_flags(inode, false);
1512                 }
1513                 return res;
1514         }
1515
1516         res = dquot_initialize(inode);
1517         if (res)
1518                 return res;
1519 retry:
1520         res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1521                                      &credits);
1522         if (res)
1523                 return res;
1524
1525         handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
1526         if (IS_ERR(handle))
1527                 return PTR_ERR(handle);
1528
1529         res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1530                                     EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1531                                     ctx, len, 0);
1532         if (!res) {
1533                 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1534                 /*
1535                  * Update inode->i_flags - S_ENCRYPTED will be enabled,
1536                  * S_DAX may be disabled
1537                  */
1538                 ext4_set_inode_flags(inode, false);
1539                 res = ext4_mark_inode_dirty(handle, inode);
1540                 if (res)
1541                         EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1542         }
1543         res2 = ext4_journal_stop(handle);
1544
1545         if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1546                 goto retry;
1547         if (!res)
1548                 res = res2;
1549         return res;
1550 }
1551
1552 static const union fscrypt_policy *ext4_get_dummy_policy(struct super_block *sb)
1553 {
1554         return EXT4_SB(sb)->s_dummy_enc_policy.policy;
1555 }
1556
1557 static bool ext4_has_stable_inodes(struct super_block *sb)
1558 {
1559         return ext4_has_feature_stable_inodes(sb);
1560 }
1561
1562 static void ext4_get_ino_and_lblk_bits(struct super_block *sb,
1563                                        int *ino_bits_ret, int *lblk_bits_ret)
1564 {
1565         *ino_bits_ret = 8 * sizeof(EXT4_SB(sb)->s_es->s_inodes_count);
1566         *lblk_bits_ret = 8 * sizeof(ext4_lblk_t);
1567 }
1568
1569 static const struct fscrypt_operations ext4_cryptops = {
1570         .key_prefix             = "ext4:",
1571         .get_context            = ext4_get_context,
1572         .set_context            = ext4_set_context,
1573         .get_dummy_policy       = ext4_get_dummy_policy,
1574         .empty_dir              = ext4_empty_dir,
1575         .has_stable_inodes      = ext4_has_stable_inodes,
1576         .get_ino_and_lblk_bits  = ext4_get_ino_and_lblk_bits,
1577 };
1578 #endif
1579
1580 #ifdef CONFIG_QUOTA
1581 static const char * const quotatypes[] = INITQFNAMES;
1582 #define QTYPE2NAME(t) (quotatypes[t])
1583
1584 static int ext4_write_dquot(struct dquot *dquot);
1585 static int ext4_acquire_dquot(struct dquot *dquot);
1586 static int ext4_release_dquot(struct dquot *dquot);
1587 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1588 static int ext4_write_info(struct super_block *sb, int type);
1589 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1590                          const struct path *path);
1591 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1592                                size_t len, loff_t off);
1593 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1594                                 const char *data, size_t len, loff_t off);
1595 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1596                              unsigned int flags);
1597
1598 static struct dquot **ext4_get_dquots(struct inode *inode)
1599 {
1600         return EXT4_I(inode)->i_dquot;
1601 }
1602
1603 static const struct dquot_operations ext4_quota_operations = {
1604         .get_reserved_space     = ext4_get_reserved_space,
1605         .write_dquot            = ext4_write_dquot,
1606         .acquire_dquot          = ext4_acquire_dquot,
1607         .release_dquot          = ext4_release_dquot,
1608         .mark_dirty             = ext4_mark_dquot_dirty,
1609         .write_info             = ext4_write_info,
1610         .alloc_dquot            = dquot_alloc,
1611         .destroy_dquot          = dquot_destroy,
1612         .get_projid             = ext4_get_projid,
1613         .get_inode_usage        = ext4_get_inode_usage,
1614         .get_next_id            = dquot_get_next_id,
1615 };
1616
1617 static const struct quotactl_ops ext4_qctl_operations = {
1618         .quota_on       = ext4_quota_on,
1619         .quota_off      = ext4_quota_off,
1620         .quota_sync     = dquot_quota_sync,
1621         .get_state      = dquot_get_state,
1622         .set_info       = dquot_set_dqinfo,
1623         .get_dqblk      = dquot_get_dqblk,
1624         .set_dqblk      = dquot_set_dqblk,
1625         .get_nextdqblk  = dquot_get_next_dqblk,
1626 };
1627 #endif
1628
1629 static const struct super_operations ext4_sops = {
1630         .alloc_inode    = ext4_alloc_inode,
1631         .free_inode     = ext4_free_in_core_inode,
1632         .destroy_inode  = ext4_destroy_inode,
1633         .write_inode    = ext4_write_inode,
1634         .dirty_inode    = ext4_dirty_inode,
1635         .drop_inode     = ext4_drop_inode,
1636         .evict_inode    = ext4_evict_inode,
1637         .put_super      = ext4_put_super,
1638         .sync_fs        = ext4_sync_fs,
1639         .freeze_fs      = ext4_freeze,
1640         .unfreeze_fs    = ext4_unfreeze,
1641         .statfs         = ext4_statfs,
1642         .remount_fs     = ext4_remount,
1643         .show_options   = ext4_show_options,
1644 #ifdef CONFIG_QUOTA
1645         .quota_read     = ext4_quota_read,
1646         .quota_write    = ext4_quota_write,
1647         .get_dquots     = ext4_get_dquots,
1648 #endif
1649 };
1650
1651 static const struct export_operations ext4_export_ops = {
1652         .fh_to_dentry = ext4_fh_to_dentry,
1653         .fh_to_parent = ext4_fh_to_parent,
1654         .get_parent = ext4_get_parent,
1655         .commit_metadata = ext4_nfs_commit_metadata,
1656 };
1657
1658 enum {
1659         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1660         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1661         Opt_nouid32, Opt_debug, Opt_removed,
1662         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1663         Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1664         Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1665         Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1666         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1667         Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1668         Opt_inlinecrypt,
1669         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1670         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1671         Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1672         Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version,
1673         Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never,
1674         Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1675         Opt_nowarn_on_error, Opt_mblk_io_submit,
1676         Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1677         Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1678         Opt_inode_readahead_blks, Opt_journal_ioprio,
1679         Opt_dioread_nolock, Opt_dioread_lock,
1680         Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1681         Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
1682         Opt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan,
1683 #ifdef CONFIG_EXT4_DEBUG
1684         Opt_fc_debug_max_replay, Opt_fc_debug_force
1685 #endif
1686 };
1687
1688 static const match_table_t tokens = {
1689         {Opt_bsd_df, "bsddf"},
1690         {Opt_minix_df, "minixdf"},
1691         {Opt_grpid, "grpid"},
1692         {Opt_grpid, "bsdgroups"},
1693         {Opt_nogrpid, "nogrpid"},
1694         {Opt_nogrpid, "sysvgroups"},
1695         {Opt_resgid, "resgid=%u"},
1696         {Opt_resuid, "resuid=%u"},
1697         {Opt_sb, "sb=%u"},
1698         {Opt_err_cont, "errors=continue"},
1699         {Opt_err_panic, "errors=panic"},
1700         {Opt_err_ro, "errors=remount-ro"},
1701         {Opt_nouid32, "nouid32"},
1702         {Opt_debug, "debug"},
1703         {Opt_removed, "oldalloc"},
1704         {Opt_removed, "orlov"},
1705         {Opt_user_xattr, "user_xattr"},
1706         {Opt_nouser_xattr, "nouser_xattr"},
1707         {Opt_acl, "acl"},
1708         {Opt_noacl, "noacl"},
1709         {Opt_noload, "norecovery"},
1710         {Opt_noload, "noload"},
1711         {Opt_removed, "nobh"},
1712         {Opt_removed, "bh"},
1713         {Opt_commit, "commit=%u"},
1714         {Opt_min_batch_time, "min_batch_time=%u"},
1715         {Opt_max_batch_time, "max_batch_time=%u"},
1716         {Opt_journal_dev, "journal_dev=%u"},
1717         {Opt_journal_path, "journal_path=%s"},
1718         {Opt_journal_checksum, "journal_checksum"},
1719         {Opt_nojournal_checksum, "nojournal_checksum"},
1720         {Opt_journal_async_commit, "journal_async_commit"},
1721         {Opt_abort, "abort"},
1722         {Opt_data_journal, "data=journal"},
1723         {Opt_data_ordered, "data=ordered"},
1724         {Opt_data_writeback, "data=writeback"},
1725         {Opt_data_err_abort, "data_err=abort"},
1726         {Opt_data_err_ignore, "data_err=ignore"},
1727         {Opt_offusrjquota, "usrjquota="},
1728         {Opt_usrjquota, "usrjquota=%s"},
1729         {Opt_offgrpjquota, "grpjquota="},
1730         {Opt_grpjquota, "grpjquota=%s"},
1731         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1732         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1733         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1734         {Opt_grpquota, "grpquota"},
1735         {Opt_noquota, "noquota"},
1736         {Opt_quota, "quota"},
1737         {Opt_usrquota, "usrquota"},
1738         {Opt_prjquota, "prjquota"},
1739         {Opt_barrier, "barrier=%u"},
1740         {Opt_barrier, "barrier"},
1741         {Opt_nobarrier, "nobarrier"},
1742         {Opt_i_version, "i_version"},
1743         {Opt_dax, "dax"},
1744         {Opt_dax_always, "dax=always"},
1745         {Opt_dax_inode, "dax=inode"},
1746         {Opt_dax_never, "dax=never"},
1747         {Opt_stripe, "stripe=%u"},
1748         {Opt_delalloc, "delalloc"},
1749         {Opt_warn_on_error, "warn_on_error"},
1750         {Opt_nowarn_on_error, "nowarn_on_error"},
1751         {Opt_lazytime, "lazytime"},
1752         {Opt_nolazytime, "nolazytime"},
1753         {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
1754         {Opt_nodelalloc, "nodelalloc"},
1755         {Opt_removed, "mblk_io_submit"},
1756         {Opt_removed, "nomblk_io_submit"},
1757         {Opt_block_validity, "block_validity"},
1758         {Opt_noblock_validity, "noblock_validity"},
1759         {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1760         {Opt_journal_ioprio, "journal_ioprio=%u"},
1761         {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1762         {Opt_auto_da_alloc, "auto_da_alloc"},
1763         {Opt_noauto_da_alloc, "noauto_da_alloc"},
1764         {Opt_dioread_nolock, "dioread_nolock"},
1765         {Opt_dioread_lock, "nodioread_nolock"},
1766         {Opt_dioread_lock, "dioread_lock"},
1767         {Opt_discard, "discard"},
1768         {Opt_nodiscard, "nodiscard"},
1769         {Opt_init_itable, "init_itable=%u"},
1770         {Opt_init_itable, "init_itable"},
1771         {Opt_noinit_itable, "noinit_itable"},
1772 #ifdef CONFIG_EXT4_DEBUG
1773         {Opt_fc_debug_force, "fc_debug_force"},
1774         {Opt_fc_debug_max_replay, "fc_debug_max_replay=%u"},
1775 #endif
1776         {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1777         {Opt_test_dummy_encryption, "test_dummy_encryption=%s"},
1778         {Opt_test_dummy_encryption, "test_dummy_encryption"},
1779         {Opt_inlinecrypt, "inlinecrypt"},
1780         {Opt_nombcache, "nombcache"},
1781         {Opt_nombcache, "no_mbcache"},  /* for backward compatibility */
1782         {Opt_removed, "prefetch_block_bitmaps"},
1783         {Opt_no_prefetch_block_bitmaps, "no_prefetch_block_bitmaps"},
1784         {Opt_mb_optimize_scan, "mb_optimize_scan=%d"},
1785         {Opt_removed, "check=none"},    /* mount option from ext2/3 */
1786         {Opt_removed, "nocheck"},       /* mount option from ext2/3 */
1787         {Opt_removed, "reservation"},   /* mount option from ext2/3 */
1788         {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1789         {Opt_removed, "journal=%u"},    /* mount option from ext2/3 */
1790         {Opt_err, NULL},
1791 };
1792
1793 static ext4_fsblk_t get_sb_block(void **data)
1794 {
1795         ext4_fsblk_t    sb_block;
1796         char            *options = (char *) *data;
1797
1798         if (!options || strncmp(options, "sb=", 3) != 0)
1799                 return 1;       /* Default location */
1800
1801         options += 3;
1802         /* TODO: use simple_strtoll with >32bit ext4 */
1803         sb_block = simple_strtoul(options, &options, 0);
1804         if (*options && *options != ',') {
1805                 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1806                        (char *) *data);
1807                 return 1;
1808         }
1809         if (*options == ',')
1810                 options++;
1811         *data = (void *) options;
1812
1813         return sb_block;
1814 }
1815
1816 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1817 #define DEFAULT_MB_OPTIMIZE_SCAN        (-1)
1818
1819 static const char deprecated_msg[] =
1820         "Mount option \"%s\" will be removed by %s\n"
1821         "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1822
1823 #ifdef CONFIG_QUOTA
1824 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1825 {
1826         struct ext4_sb_info *sbi = EXT4_SB(sb);
1827         char *qname, *old_qname = get_qf_name(sb, sbi, qtype);
1828         int ret = -1;
1829
1830         if (sb_any_quota_loaded(sb) && !old_qname) {
1831                 ext4_msg(sb, KERN_ERR,
1832                         "Cannot change journaled "
1833                         "quota options when quota turned on");
1834                 return -1;
1835         }
1836         if (ext4_has_feature_quota(sb)) {
1837                 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1838                          "ignored when QUOTA feature is enabled");
1839                 return 1;
1840         }
1841         qname = match_strdup(args);
1842         if (!qname) {
1843                 ext4_msg(sb, KERN_ERR,
1844                         "Not enough memory for storing quotafile name");
1845                 return -1;
1846         }
1847         if (old_qname) {
1848                 if (strcmp(old_qname, qname) == 0)
1849                         ret = 1;
1850                 else
1851                         ext4_msg(sb, KERN_ERR,
1852                                  "%s quota file already specified",
1853                                  QTYPE2NAME(qtype));
1854                 goto errout;
1855         }
1856         if (strchr(qname, '/')) {
1857                 ext4_msg(sb, KERN_ERR,
1858                         "quotafile must be on filesystem root");
1859                 goto errout;
1860         }
1861         rcu_assign_pointer(sbi->s_qf_names[qtype], qname);
1862         set_opt(sb, QUOTA);
1863         return 1;
1864 errout:
1865         kfree(qname);
1866         return ret;
1867 }
1868
1869 static int clear_qf_name(struct super_block *sb, int qtype)
1870 {
1871
1872         struct ext4_sb_info *sbi = EXT4_SB(sb);
1873         char *old_qname = get_qf_name(sb, sbi, qtype);
1874
1875         if (sb_any_quota_loaded(sb) && old_qname) {
1876                 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1877                         " when quota turned on");
1878                 return -1;
1879         }
1880         rcu_assign_pointer(sbi->s_qf_names[qtype], NULL);
1881         synchronize_rcu();
1882         kfree(old_qname);
1883         return 1;
1884 }
1885 #endif
1886
1887 #define MOPT_SET        0x0001
1888 #define MOPT_CLEAR      0x0002
1889 #define MOPT_NOSUPPORT  0x0004
1890 #define MOPT_EXPLICIT   0x0008
1891 #define MOPT_CLEAR_ERR  0x0010
1892 #define MOPT_GTE0       0x0020
1893 #ifdef CONFIG_QUOTA
1894 #define MOPT_Q          0
1895 #define MOPT_QFMT       0x0040
1896 #else
1897 #define MOPT_Q          MOPT_NOSUPPORT
1898 #define MOPT_QFMT       MOPT_NOSUPPORT
1899 #endif
1900 #define MOPT_DATAJ      0x0080
1901 #define MOPT_NO_EXT2    0x0100
1902 #define MOPT_NO_EXT3    0x0200
1903 #define MOPT_EXT4_ONLY  (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1904 #define MOPT_STRING     0x0400
1905 #define MOPT_SKIP       0x0800
1906 #define MOPT_2          0x1000
1907
1908 static const struct mount_opts {
1909         int     token;
1910         int     mount_opt;
1911         int     flags;
1912 } ext4_mount_opts[] = {
1913         {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1914         {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1915         {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1916         {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1917         {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1918         {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1919         {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1920          MOPT_EXT4_ONLY | MOPT_SET},
1921         {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1922          MOPT_EXT4_ONLY | MOPT_CLEAR},
1923         {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1924         {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1925         {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1926          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1927         {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1928          MOPT_EXT4_ONLY | MOPT_CLEAR},
1929         {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1930         {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
1931         {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1932          MOPT_EXT4_ONLY | MOPT_CLEAR},
1933         {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1934          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1935         {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1936                                     EXT4_MOUNT_JOURNAL_CHECKSUM),
1937          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1938         {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1939         {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1940         {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1941         {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1942         {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1943          MOPT_NO_EXT2},
1944         {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1945          MOPT_NO_EXT2},
1946         {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1947         {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1948         {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1949         {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1950         {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1951         {Opt_commit, 0, MOPT_GTE0},
1952         {Opt_max_batch_time, 0, MOPT_GTE0},
1953         {Opt_min_batch_time, 0, MOPT_GTE0},
1954         {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1955         {Opt_init_itable, 0, MOPT_GTE0},
1956         {Opt_dax, EXT4_MOUNT_DAX_ALWAYS, MOPT_SET | MOPT_SKIP},
1957         {Opt_dax_always, EXT4_MOUNT_DAX_ALWAYS,
1958                 MOPT_EXT4_ONLY | MOPT_SET | MOPT_SKIP},
1959         {Opt_dax_inode, EXT4_MOUNT2_DAX_INODE,
1960                 MOPT_EXT4_ONLY | MOPT_SET | MOPT_SKIP},
1961         {Opt_dax_never, EXT4_MOUNT2_DAX_NEVER,
1962                 MOPT_EXT4_ONLY | MOPT_SET | MOPT_SKIP},
1963         {Opt_stripe, 0, MOPT_GTE0},
1964         {Opt_resuid, 0, MOPT_GTE0},
1965         {Opt_resgid, 0, MOPT_GTE0},
1966         {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1967         {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1968         {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1969         {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1970         {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1971         {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1972          MOPT_NO_EXT2 | MOPT_DATAJ},
1973         {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1974         {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1975 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1976         {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1977         {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1978 #else
1979         {Opt_acl, 0, MOPT_NOSUPPORT},
1980         {Opt_noacl, 0, MOPT_NOSUPPORT},
1981 #endif
1982         {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1983         {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1984         {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
1985         {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1986         {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1987                                                         MOPT_SET | MOPT_Q},
1988         {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1989                                                         MOPT_SET | MOPT_Q},
1990         {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1991                                                         MOPT_SET | MOPT_Q},
1992         {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1993                        EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1994                                                         MOPT_CLEAR | MOPT_Q},
1995         {Opt_usrjquota, 0, MOPT_Q | MOPT_STRING},
1996         {Opt_grpjquota, 0, MOPT_Q | MOPT_STRING},
1997         {Opt_offusrjquota, 0, MOPT_Q},
1998         {Opt_offgrpjquota, 0, MOPT_Q},
1999         {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
2000         {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
2001         {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
2002         {Opt_max_dir_size_kb, 0, MOPT_GTE0},
2003         {Opt_test_dummy_encryption, 0, MOPT_STRING},
2004         {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
2005         {Opt_no_prefetch_block_bitmaps, EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS,
2006          MOPT_SET},
2007         {Opt_mb_optimize_scan, EXT4_MOUNT2_MB_OPTIMIZE_SCAN, MOPT_GTE0},
2008 #ifdef CONFIG_EXT4_DEBUG
2009         {Opt_fc_debug_force, EXT4_MOUNT2_JOURNAL_FAST_COMMIT,
2010          MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY},
2011         {Opt_fc_debug_max_replay, 0, MOPT_GTE0},
2012 #endif
2013         {Opt_err, 0, 0}
2014 };
2015
2016 #ifdef CONFIG_UNICODE
2017 static const struct ext4_sb_encodings {
2018         __u16 magic;
2019         char *name;
2020         char *version;
2021 } ext4_sb_encoding_map[] = {
2022         {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"},
2023 };
2024
2025 static int ext4_sb_read_encoding(const struct ext4_super_block *es,
2026                                  const struct ext4_sb_encodings **encoding,
2027                                  __u16 *flags)
2028 {
2029         __u16 magic = le16_to_cpu(es->s_encoding);
2030         int i;
2031
2032         for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
2033                 if (magic == ext4_sb_encoding_map[i].magic)
2034                         break;
2035
2036         if (i >= ARRAY_SIZE(ext4_sb_encoding_map))
2037                 return -EINVAL;
2038
2039         *encoding = &ext4_sb_encoding_map[i];
2040         *flags = le16_to_cpu(es->s_encoding_flags);
2041
2042         return 0;
2043 }
2044 #endif
2045
2046 static int ext4_set_test_dummy_encryption(struct super_block *sb,
2047                                           const char *opt,
2048                                           const substring_t *arg,
2049                                           bool is_remount)
2050 {
2051 #ifdef CONFIG_FS_ENCRYPTION
2052         struct ext4_sb_info *sbi = EXT4_SB(sb);
2053         int err;
2054
2055         /*
2056          * This mount option is just for testing, and it's not worthwhile to
2057          * implement the extra complexity (e.g. RCU protection) that would be
2058          * needed to allow it to be set or changed during remount.  We do allow
2059          * it to be specified during remount, but only if there is no change.
2060          */
2061         if (is_remount && !sbi->s_dummy_enc_policy.policy) {
2062                 ext4_msg(sb, KERN_WARNING,
2063                          "Can't set test_dummy_encryption on remount");
2064                 return -1;
2065         }
2066         err = fscrypt_set_test_dummy_encryption(sb, arg->from,
2067                                                 &sbi->s_dummy_enc_policy);
2068         if (err) {
2069                 if (err == -EEXIST)
2070                         ext4_msg(sb, KERN_WARNING,
2071                                  "Can't change test_dummy_encryption on remount");
2072                 else if (err == -EINVAL)
2073                         ext4_msg(sb, KERN_WARNING,
2074                                  "Value of option \"%s\" is unrecognized", opt);
2075                 else
2076                         ext4_msg(sb, KERN_WARNING,
2077                                  "Error processing option \"%s\" [%d]",
2078                                  opt, err);
2079                 return -1;
2080         }
2081         ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled");
2082 #else
2083         ext4_msg(sb, KERN_WARNING,
2084                  "Test dummy encryption mount option ignored");
2085 #endif
2086         return 1;
2087 }
2088
2089 struct ext4_parsed_options {
2090         unsigned long journal_devnum;
2091         unsigned int journal_ioprio;
2092         int mb_optimize_scan;
2093 };
2094
2095 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
2096                             substring_t *args, struct ext4_parsed_options *parsed_opts,
2097                             int is_remount)
2098 {
2099         struct ext4_sb_info *sbi = EXT4_SB(sb);
2100         const struct mount_opts *m;
2101         kuid_t uid;
2102         kgid_t gid;
2103         int arg = 0;
2104
2105 #ifdef CONFIG_QUOTA
2106         if (token == Opt_usrjquota)
2107                 return set_qf_name(sb, USRQUOTA, &args[0]);
2108         else if (token == Opt_grpjquota)
2109                 return set_qf_name(sb, GRPQUOTA, &args[0]);
2110         else if (token == Opt_offusrjquota)
2111                 return clear_qf_name(sb, USRQUOTA);
2112         else if (token == Opt_offgrpjquota)
2113                 return clear_qf_name(sb, GRPQUOTA);
2114 #endif
2115         switch (token) {
2116         case Opt_noacl:
2117         case Opt_nouser_xattr:
2118                 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
2119                 break;
2120         case Opt_sb:
2121                 return 1;       /* handled by get_sb_block() */
2122         case Opt_removed:
2123                 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
2124                 return 1;
2125         case Opt_abort:
2126                 ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED);
2127                 return 1;
2128         case Opt_i_version:
2129                 sb->s_flags |= SB_I_VERSION;
2130                 return 1;
2131         case Opt_lazytime:
2132                 sb->s_flags |= SB_LAZYTIME;
2133                 return 1;
2134         case Opt_nolazytime:
2135                 sb->s_flags &= ~SB_LAZYTIME;
2136                 return 1;
2137         case Opt_inlinecrypt:
2138 #ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT
2139                 sb->s_flags |= SB_INLINECRYPT;
2140 #else
2141                 ext4_msg(sb, KERN_ERR, "inline encryption not supported");
2142 #endif
2143                 return 1;
2144         }
2145
2146         for (m = ext4_mount_opts; m->token != Opt_err; m++)
2147                 if (token == m->token)
2148                         break;
2149
2150         if (m->token == Opt_err) {
2151                 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
2152                          "or missing value", opt);
2153                 return -1;
2154         }
2155
2156         if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
2157                 ext4_msg(sb, KERN_ERR,
2158                          "Mount option \"%s\" incompatible with ext2", opt);
2159                 return -1;
2160         }
2161         if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
2162                 ext4_msg(sb, KERN_ERR,
2163                          "Mount option \"%s\" incompatible with ext3", opt);
2164                 return -1;
2165         }
2166
2167         if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
2168                 return -1;
2169         if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
2170                 return -1;
2171         if (m->flags & MOPT_EXPLICIT) {
2172                 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
2173                         set_opt2(sb, EXPLICIT_DELALLOC);
2174                 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
2175                         set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
2176                 } else
2177                         return -1;
2178         }
2179         if (m->flags & MOPT_CLEAR_ERR)
2180                 clear_opt(sb, ERRORS_MASK);
2181         if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
2182                 ext4_msg(sb, KERN_ERR, "Cannot change quota "
2183                          "options when quota turned on");
2184                 return -1;
2185         }
2186
2187         if (m->flags & MOPT_NOSUPPORT) {
2188                 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
2189         } else if (token == Opt_commit) {
2190                 if (arg == 0)
2191                         arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
2192                 else if (arg > INT_MAX / HZ) {
2193                         ext4_msg(sb, KERN_ERR,
2194                                  "Invalid commit interval %d, "
2195                                  "must be smaller than %d",
2196                                  arg, INT_MAX / HZ);
2197                         return -1;
2198                 }
2199                 sbi->s_commit_interval = HZ * arg;
2200         } else if (token == Opt_debug_want_extra_isize) {
2201                 if ((arg & 1) ||
2202                     (arg < 4) ||
2203                     (arg > (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE))) {
2204                         ext4_msg(sb, KERN_ERR,
2205                                  "Invalid want_extra_isize %d", arg);
2206                         return -1;
2207                 }
2208                 sbi->s_want_extra_isize = arg;
2209         } else if (token == Opt_max_batch_time) {
2210                 sbi->s_max_batch_time = arg;
2211         } else if (token == Opt_min_batch_time) {
2212                 sbi->s_min_batch_time = arg;
2213         } else if (token == Opt_inode_readahead_blks) {
2214                 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
2215                         ext4_msg(sb, KERN_ERR,
2216                                  "EXT4-fs: inode_readahead_blks must be "
2217                                  "0 or a power of 2 smaller than 2^31");
2218                         return -1;
2219                 }
2220                 sbi->s_inode_readahead_blks = arg;
2221         } else if (token == Opt_init_itable) {
2222                 set_opt(sb, INIT_INODE_TABLE);
2223                 if (!args->from)
2224                         arg = EXT4_DEF_LI_WAIT_MULT;
2225                 sbi->s_li_wait_mult = arg;
2226         } else if (token == Opt_max_dir_size_kb) {
2227                 sbi->s_max_dir_size_kb = arg;
2228 #ifdef CONFIG_EXT4_DEBUG
2229         } else if (token == Opt_fc_debug_max_replay) {
2230                 sbi->s_fc_debug_max_replay = arg;
2231 #endif
2232         } else if (token == Opt_stripe) {
2233                 sbi->s_stripe = arg;
2234         } else if (token == Opt_resuid) {
2235                 uid = make_kuid(current_user_ns(), arg);
2236                 if (!uid_valid(uid)) {
2237                         ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
2238                         return -1;
2239                 }
2240                 sbi->s_resuid = uid;
2241         } else if (token == Opt_resgid) {
2242                 gid = make_kgid(current_user_ns(), arg);
2243                 if (!gid_valid(gid)) {
2244                         ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
2245                         return -1;
2246                 }
2247                 sbi->s_resgid = gid;
2248         } else if (token == Opt_journal_dev) {
2249                 if (is_remount) {
2250                         ext4_msg(sb, KERN_ERR,
2251                                  "Cannot specify journal on remount");
2252                         return -1;
2253                 }
2254                 parsed_opts->journal_devnum = arg;
2255         } else if (token == Opt_journal_path) {
2256                 char *journal_path;
2257                 struct inode *journal_inode;
2258                 struct path path;
2259                 int error;
2260
2261                 if (is_remount) {
2262                         ext4_msg(sb, KERN_ERR,
2263                                  "Cannot specify journal on remount");
2264                         return -1;
2265                 }
2266                 journal_path = match_strdup(&args[0]);
2267                 if (!journal_path) {
2268                         ext4_msg(sb, KERN_ERR, "error: could not dup "
2269                                 "journal device string");
2270                         return -1;
2271                 }
2272
2273                 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
2274                 if (error) {
2275                         ext4_msg(sb, KERN_ERR, "error: could not find "
2276                                 "journal device path: error %d", error);
2277                         kfree(journal_path);
2278                         return -1;
2279                 }
2280
2281                 journal_inode = d_inode(path.dentry);
2282                 if (!S_ISBLK(journal_inode->i_mode)) {
2283                         ext4_msg(sb, KERN_ERR, "error: journal path %s "
2284                                 "is not a block device", journal_path);
2285                         path_put(&path);
2286                         kfree(journal_path);
2287                         return -1;
2288                 }
2289
2290                 parsed_opts->journal_devnum = new_encode_dev(journal_inode->i_rdev);
2291                 path_put(&path);
2292                 kfree(journal_path);
2293         } else if (token == Opt_journal_ioprio) {
2294                 if (arg > 7) {
2295                         ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
2296                                  " (must be 0-7)");
2297                         return -1;
2298                 }
2299                 parsed_opts->journal_ioprio =
2300                         IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
2301         } else if (token == Opt_test_dummy_encryption) {
2302                 return ext4_set_test_dummy_encryption(sb, opt, &args[0],
2303                                                       is_remount);
2304         } else if (m->flags & MOPT_DATAJ) {
2305                 if (is_remount) {
2306                         if (!sbi->s_journal)
2307                                 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
2308                         else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
2309                                 ext4_msg(sb, KERN_ERR,
2310                                          "Cannot change data mode on remount");
2311                                 return -1;
2312                         }
2313                 } else {
2314                         clear_opt(sb, DATA_FLAGS);
2315                         sbi->s_mount_opt |= m->mount_opt;
2316                 }
2317 #ifdef CONFIG_QUOTA
2318         } else if (m->flags & MOPT_QFMT) {
2319                 if (sb_any_quota_loaded(sb) &&
2320                     sbi->s_jquota_fmt != m->mount_opt) {
2321                         ext4_msg(sb, KERN_ERR, "Cannot change journaled "
2322                                  "quota options when quota turned on");
2323                         return -1;
2324                 }
2325                 if (ext4_has_feature_quota(sb)) {
2326                         ext4_msg(sb, KERN_INFO,
2327                                  "Quota format mount options ignored "
2328                                  "when QUOTA feature is enabled");
2329                         return 1;
2330                 }
2331                 sbi->s_jquota_fmt = m->mount_opt;
2332 #endif
2333         } else if (token == Opt_dax || token == Opt_dax_always ||
2334                    token == Opt_dax_inode || token == Opt_dax_never) {
2335 #ifdef CONFIG_FS_DAX
2336                 switch (token) {
2337                 case Opt_dax:
2338                 case Opt_dax_always:
2339                         if (is_remount &&
2340                             (!(sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2341                              (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER))) {
2342                         fail_dax_change_remount:
2343                                 ext4_msg(sb, KERN_ERR, "can't change "
2344                                          "dax mount option while remounting");
2345                                 return -1;
2346                         }
2347                         if (is_remount &&
2348                             (test_opt(sb, DATA_FLAGS) ==
2349                              EXT4_MOUNT_JOURNAL_DATA)) {
2350                                     ext4_msg(sb, KERN_ERR, "can't mount with "
2351                                              "both data=journal and dax");
2352                                     return -1;
2353                         }
2354                         ext4_msg(sb, KERN_WARNING,
2355                                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
2356                         sbi->s_mount_opt |= EXT4_MOUNT_DAX_ALWAYS;
2357                         sbi->s_mount_opt2 &= ~EXT4_MOUNT2_DAX_NEVER;
2358                         break;
2359                 case Opt_dax_never:
2360                         if (is_remount &&
2361                             (!(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2362                              (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS)))
2363                                 goto fail_dax_change_remount;
2364                         sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_NEVER;
2365                         sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS;
2366                         break;
2367                 case Opt_dax_inode:
2368                         if (is_remount &&
2369                             ((sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2370                              (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2371                              !(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_INODE)))
2372                                 goto fail_dax_change_remount;
2373                         sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS;
2374                         sbi->s_mount_opt2 &= ~EXT4_MOUNT2_DAX_NEVER;
2375                         /* Strictly for printing options */
2376                         sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_INODE;
2377                         break;
2378                 }
2379 #else
2380                 ext4_msg(sb, KERN_INFO, "dax option not supported");
2381                 sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_NEVER;
2382                 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS;
2383                 return -1;
2384 #endif
2385         } else if (token == Opt_data_err_abort) {
2386                 sbi->s_mount_opt |= m->mount_opt;
2387         } else if (token == Opt_data_err_ignore) {
2388                 sbi->s_mount_opt &= ~m->mount_opt;
2389         } else if (token == Opt_mb_optimize_scan) {
2390                 if (arg != 0 && arg != 1) {
2391                         ext4_msg(sb, KERN_WARNING,
2392                                  "mb_optimize_scan should be set to 0 or 1.");
2393                         return -1;
2394                 }
2395                 parsed_opts->mb_optimize_scan = arg;
2396         } else {
2397                 if (!args->from)
2398                         arg = 1;
2399                 if (m->flags & MOPT_CLEAR)
2400                         arg = !arg;
2401                 else if (unlikely(!(m->flags & MOPT_SET))) {
2402                         ext4_msg(sb, KERN_WARNING,
2403                                  "buggy handling of option %s", opt);
2404                         WARN_ON(1);
2405                         return -1;
2406                 }
2407                 if (m->flags & MOPT_2) {
2408                         if (arg != 0)
2409                                 sbi->s_mount_opt2 |= m->mount_opt;
2410                         else
2411                                 sbi->s_mount_opt2 &= ~m->mount_opt;
2412                 } else {
2413                         if (arg != 0)
2414                                 sbi->s_mount_opt |= m->mount_opt;
2415                         else
2416                                 sbi->s_mount_opt &= ~m->mount_opt;
2417                 }
2418         }
2419         return 1;
2420 }
2421
2422 static int parse_options(char *options, struct super_block *sb,
2423                          struct ext4_parsed_options *ret_opts,
2424                          int is_remount)
2425 {
2426         struct ext4_sb_info __maybe_unused *sbi = EXT4_SB(sb);
2427         char *p, __maybe_unused *usr_qf_name, __maybe_unused *grp_qf_name;
2428         substring_t args[MAX_OPT_ARGS];
2429         int token;
2430
2431         if (!options)
2432                 return 1;
2433
2434         while ((p = strsep(&options, ",")) != NULL) {
2435                 if (!*p)
2436                         continue;
2437                 /*
2438                  * Initialize args struct so we know whether arg was
2439                  * found; some options take optional arguments.
2440                  */
2441                 args[0].to = args[0].from = NULL;
2442                 token = match_token(p, tokens, args);
2443                 if (handle_mount_opt(sb, p, token, args, ret_opts,
2444                                      is_remount) < 0)
2445                         return 0;
2446         }
2447 #ifdef CONFIG_QUOTA
2448         /*
2449          * We do the test below only for project quotas. 'usrquota' and
2450          * 'grpquota' mount options are allowed even without quota feature
2451          * to support legacy quotas in quota files.
2452          */
2453         if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
2454                 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
2455                          "Cannot enable project quota enforcement.");
2456                 return 0;
2457         }
2458         usr_qf_name = get_qf_name(sb, sbi, USRQUOTA);
2459         grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA);
2460         if (usr_qf_name || grp_qf_name) {
2461                 if (test_opt(sb, USRQUOTA) && usr_qf_name)
2462                         clear_opt(sb, USRQUOTA);
2463
2464                 if (test_opt(sb, GRPQUOTA) && grp_qf_name)
2465                         clear_opt(sb, GRPQUOTA);
2466
2467                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
2468                         ext4_msg(sb, KERN_ERR, "old and new quota "
2469                                         "format mixing");
2470                         return 0;
2471                 }
2472
2473                 if (!sbi->s_jquota_fmt) {
2474                         ext4_msg(sb, KERN_ERR, "journaled quota format "
2475                                         "not specified");
2476                         return 0;
2477                 }
2478         }
2479 #endif
2480         if (test_opt(sb, DIOREAD_NOLOCK)) {
2481                 int blocksize =
2482                         BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2483                 if (blocksize < PAGE_SIZE)
2484                         ext4_msg(sb, KERN_WARNING, "Warning: mounting with an "
2485                                  "experimental mount option 'dioread_nolock' "
2486                                  "for blocksize < PAGE_SIZE");
2487         }
2488         return 1;
2489 }
2490
2491 static inline void ext4_show_quota_options(struct seq_file *seq,
2492                                            struct super_block *sb)
2493 {
2494 #if defined(CONFIG_QUOTA)
2495         struct ext4_sb_info *sbi = EXT4_SB(sb);
2496         char *usr_qf_name, *grp_qf_name;
2497
2498         if (sbi->s_jquota_fmt) {
2499                 char *fmtname = "";
2500
2501                 switch (sbi->s_jquota_fmt) {
2502                 case QFMT_VFS_OLD:
2503                         fmtname = "vfsold";
2504                         break;
2505                 case QFMT_VFS_V0:
2506                         fmtname = "vfsv0";
2507                         break;
2508                 case QFMT_VFS_V1:
2509                         fmtname = "vfsv1";
2510                         break;
2511                 }
2512                 seq_printf(seq, ",jqfmt=%s", fmtname);
2513         }
2514
2515         rcu_read_lock();
2516         usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2517         grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2518         if (usr_qf_name)
2519                 seq_show_option(seq, "usrjquota", usr_qf_name);
2520         if (grp_qf_name)
2521                 seq_show_option(seq, "grpjquota", grp_qf_name);
2522         rcu_read_unlock();
2523 #endif
2524 }
2525
2526 static const char *token2str(int token)
2527 {
2528         const struct match_token *t;
2529
2530         for (t = tokens; t->token != Opt_err; t++)
2531                 if (t->token == token && !strchr(t->pattern, '='))
2532                         break;
2533         return t->pattern;
2534 }
2535
2536 /*
2537  * Show an option if
2538  *  - it's set to a non-default value OR
2539  *  - if the per-sb default is different from the global default
2540  */
2541 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2542                               int nodefs)
2543 {
2544         struct ext4_sb_info *sbi = EXT4_SB(sb);
2545         struct ext4_super_block *es = sbi->s_es;
2546         int def_errors, def_mount_opt = sbi->s_def_mount_opt;
2547         const struct mount_opts *m;
2548         char sep = nodefs ? '\n' : ',';
2549
2550 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2551 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2552
2553         if (sbi->s_sb_block != 1)
2554                 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2555
2556         for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2557                 int want_set = m->flags & MOPT_SET;
2558                 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2559                     (m->flags & MOPT_CLEAR_ERR) || m->flags & MOPT_SKIP)
2560                         continue;
2561                 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
2562                         continue; /* skip if same as the default */
2563                 if ((want_set &&
2564                      (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2565                     (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2566                         continue; /* select Opt_noFoo vs Opt_Foo */
2567                 SEQ_OPTS_PRINT("%s", token2str(m->token));
2568         }
2569
2570         if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
2571             le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
2572                 SEQ_OPTS_PRINT("resuid=%u",
2573                                 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2574         if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
2575             le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
2576                 SEQ_OPTS_PRINT("resgid=%u",
2577                                 from_kgid_munged(&init_user_ns, sbi->s_resgid));
2578         def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
2579         if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2580                 SEQ_OPTS_PUTS("errors=remount-ro");
2581         if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
2582                 SEQ_OPTS_PUTS("errors=continue");
2583         if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
2584                 SEQ_OPTS_PUTS("errors=panic");
2585         if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
2586                 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
2587         if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
2588                 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
2589         if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
2590                 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2591         if (sb->s_flags & SB_I_VERSION)
2592                 SEQ_OPTS_PUTS("i_version");
2593         if (nodefs || sbi->s_stripe)
2594                 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
2595         if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2596                         (sbi->s_mount_opt ^ def_mount_opt)) {
2597                 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2598                         SEQ_OPTS_PUTS("data=journal");
2599                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2600                         SEQ_OPTS_PUTS("data=ordered");
2601                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2602                         SEQ_OPTS_PUTS("data=writeback");
2603         }
2604         if (nodefs ||
2605             sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
2606                 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2607                                sbi->s_inode_readahead_blks);
2608
2609         if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
2610                        (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
2611                 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2612         if (nodefs || sbi->s_max_dir_size_kb)
2613                 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2614         if (test_opt(sb, DATA_ERR_ABORT))
2615                 SEQ_OPTS_PUTS("data_err=abort");
2616
2617         fscrypt_show_test_dummy_encryption(seq, sep, sb);
2618
2619         if (sb->s_flags & SB_INLINECRYPT)
2620                 SEQ_OPTS_PUTS("inlinecrypt");
2621
2622         if (test_opt(sb, DAX_ALWAYS)) {
2623                 if (IS_EXT2_SB(sb))
2624                         SEQ_OPTS_PUTS("dax");
2625                 else
2626                         SEQ_OPTS_PUTS("dax=always");
2627         } else if (test_opt2(sb, DAX_NEVER)) {
2628                 SEQ_OPTS_PUTS("dax=never");
2629         } else if (test_opt2(sb, DAX_INODE)) {
2630                 SEQ_OPTS_PUTS("dax=inode");
2631         }
2632         ext4_show_quota_options(seq, sb);
2633         return 0;
2634 }
2635
2636 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2637 {
2638         return _ext4_show_options(seq, root->d_sb, 0);
2639 }
2640
2641 int ext4_seq_options_show(struct seq_file *seq, void *offset)
2642 {
2643         struct super_block *sb = seq->private;
2644         int rc;
2645
2646         seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
2647         rc = _ext4_show_options(seq, sb, 1);
2648         seq_puts(seq, "\n");
2649         return rc;
2650 }
2651
2652 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
2653                             int read_only)
2654 {
2655         struct ext4_sb_info *sbi = EXT4_SB(sb);
2656         int err = 0;
2657
2658         if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2659                 ext4_msg(sb, KERN_ERR, "revision level too high, "
2660                          "forcing read-only mode");
2661                 err = -EROFS;
2662                 goto done;
2663         }
2664         if (read_only)
2665                 goto done;
2666         if (!(sbi->s_mount_state & EXT4_VALID_FS))
2667                 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2668                          "running e2fsck is recommended");
2669         else if (sbi->s_mount_state & EXT4_ERROR_FS)
2670                 ext4_msg(sb, KERN_WARNING,
2671                          "warning: mounting fs with errors, "
2672                          "running e2fsck is recommended");
2673         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
2674                  le16_to_cpu(es->s_mnt_count) >=
2675                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2676                 ext4_msg(sb, KERN_WARNING,
2677                          "warning: maximal mount count reached, "
2678                          "running e2fsck is recommended");
2679         else if (le32_to_cpu(es->s_checkinterval) &&
2680                  (ext4_get_tstamp(es, s_lastcheck) +
2681                   le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
2682                 ext4_msg(sb, KERN_WARNING,
2683                          "warning: checktime reached, "
2684                          "running e2fsck is recommended");
2685         if (!sbi->s_journal)
2686                 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
2687         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
2688                 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
2689         le16_add_cpu(&es->s_mnt_count, 1);
2690         ext4_update_tstamp(es, s_mtime);
2691         if (sbi->s_journal) {
2692                 ext4_set_feature_journal_needs_recovery(sb);
2693                 if (ext4_has_feature_orphan_file(sb))
2694                         ext4_set_feature_orphan_present(sb);
2695         }
2696
2697         err = ext4_commit_super(sb);
2698 done:
2699         if (test_opt(sb, DEBUG))
2700                 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
2701                                 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2702                         sb->s_blocksize,
2703                         sbi->s_groups_count,
2704                         EXT4_BLOCKS_PER_GROUP(sb),
2705                         EXT4_INODES_PER_GROUP(sb),
2706                         sbi->s_mount_opt, sbi->s_mount_opt2);
2707
2708         cleancache_init_fs(sb);
2709         return err;
2710 }
2711
2712 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2713 {
2714         struct ext4_sb_info *sbi = EXT4_SB(sb);
2715         struct flex_groups **old_groups, **new_groups;
2716         int size, i, j;
2717
2718         if (!sbi->s_log_groups_per_flex)
2719                 return 0;
2720
2721         size = ext4_flex_group(sbi, ngroup - 1) + 1;
2722         if (size <= sbi->s_flex_groups_allocated)
2723                 return 0;
2724
2725         new_groups = kvzalloc(roundup_pow_of_two(size *
2726                               sizeof(*sbi->s_flex_groups)), GFP_KERNEL);
2727         if (!new_groups) {
2728                 ext4_msg(sb, KERN_ERR,
2729                          "not enough memory for %d flex group pointers", size);
2730                 return -ENOMEM;
2731         }
2732         for (i = sbi->s_flex_groups_allocated; i < size; i++) {
2733                 new_groups[i] = kvzalloc(roundup_pow_of_two(
2734                                          sizeof(struct flex_groups)),
2735                                          GFP_KERNEL);
2736                 if (!new_groups[i]) {
2737                         for (j = sbi->s_flex_groups_allocated; j < i; j++)
2738                                 kvfree(new_groups[j]);
2739                         kvfree(new_groups);
2740                         ext4_msg(sb, KERN_ERR,
2741                                  "not enough memory for %d flex groups", size);
2742                         return -ENOMEM;
2743                 }
2744         }
2745         rcu_read_lock();
2746         old_groups = rcu_dereference(sbi->s_flex_groups);
2747         if (old_groups)
2748                 memcpy(new_groups, old_groups,
2749                        (sbi->s_flex_groups_allocated *
2750                         sizeof(struct flex_groups *)));
2751         rcu_read_unlock();
2752         rcu_assign_pointer(sbi->s_flex_groups, new_groups);
2753         sbi->s_flex_groups_allocated = size;
2754         if (old_groups)
2755                 ext4_kvfree_array_rcu(old_groups);
2756         return 0;
2757 }
2758
2759 static int ext4_fill_flex_info(struct super_block *sb)
2760 {
2761         struct ext4_sb_info *sbi = EXT4_SB(sb);
2762         struct ext4_group_desc *gdp = NULL;
2763         struct flex_groups *fg;
2764         ext4_group_t flex_group;
2765         int i, err;
2766
2767         sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2768         if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2769                 sbi->s_log_groups_per_flex = 0;
2770                 return 1;
2771         }
2772
2773         err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2774         if (err)
2775                 goto failed;
2776
2777         for (i = 0; i < sbi->s_groups_count; i++) {
2778                 gdp = ext4_get_group_desc(sb, i, NULL);
2779
2780                 flex_group = ext4_flex_group(sbi, i);
2781                 fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
2782                 atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes);
2783                 atomic64_add(ext4_free_group_clusters(sb, gdp),
2784                              &fg->free_clusters);
2785                 atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs);
2786         }
2787
2788         return 1;
2789 failed:
2790         return 0;
2791 }
2792
2793 static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2794                                    struct ext4_group_desc *gdp)
2795 {
2796         int offset = offsetof(struct ext4_group_desc, bg_checksum);
2797         __u16 crc = 0;
2798         __le32 le_group = cpu_to_le32(block_group);
2799         struct ext4_sb_info *sbi = EXT4_SB(sb);
2800
2801         if (ext4_has_metadata_csum(sbi->s_sb)) {
2802                 /* Use new metadata_csum algorithm */
2803                 __u32 csum32;
2804                 __u16 dummy_csum = 0;
2805
2806                 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2807                                      sizeof(le_group));
2808                 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2809                 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2810                                      sizeof(dummy_csum));
2811                 offset += sizeof(dummy_csum);
2812                 if (offset < sbi->s_desc_size)
2813                         csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2814                                              sbi->s_desc_size - offset);
2815
2816                 crc = csum32 & 0xFFFF;
2817                 goto out;
2818         }
2819
2820         /* old crc16 code */
2821         if (!ext4_has_feature_gdt_csum(sb))
2822                 return 0;
2823
2824         crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2825         crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2826         crc = crc16(crc, (__u8 *)gdp, offset);
2827         offset += sizeof(gdp->bg_checksum); /* skip checksum */
2828         /* for checksum of struct ext4_group_desc do the rest...*/
2829         if (ext4_has_feature_64bit(sb) &&
2830             offset < le16_to_cpu(sbi->s_es->s_desc_size))
2831                 crc = crc16(crc, (__u8 *)gdp + offset,
2832                             le16_to_cpu(sbi->s_es->s_desc_size) -
2833                                 offset);
2834
2835 out:
2836         return cpu_to_le16(crc);
2837 }
2838
2839 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2840                                 struct ext4_group_desc *gdp)
2841 {
2842         if (ext4_has_group_desc_csum(sb) &&
2843             (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
2844                 return 0;
2845
2846         return 1;
2847 }
2848
2849 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2850                               struct ext4_group_desc *gdp)
2851 {
2852         if (!ext4_has_group_desc_csum(sb))
2853                 return;
2854         gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2855 }
2856
2857 /* Called at mount-time, super-block is locked */
2858 static int ext4_check_descriptors(struct super_block *sb,
2859                                   ext4_fsblk_t sb_block,
2860                                   ext4_group_t *first_not_zeroed)
2861 {
2862         struct ext4_sb_info *sbi = EXT4_SB(sb);
2863         ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2864         ext4_fsblk_t last_block;
2865         ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
2866         ext4_fsblk_t block_bitmap;
2867         ext4_fsblk_t inode_bitmap;
2868         ext4_fsblk_t inode_table;
2869         int flexbg_flag = 0;
2870         ext4_group_t i, grp = sbi->s_groups_count;
2871
2872         if (ext4_has_feature_flex_bg(sb))
2873                 flexbg_flag = 1;
2874
2875         ext4_debug("Checking group descriptors");
2876
2877         for (i = 0; i < sbi->s_groups_count; i++) {
2878                 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2879
2880                 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2881                         last_block = ext4_blocks_count(sbi->s_es) - 1;
2882                 else
2883                         last_block = first_block +
2884                                 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2885
2886                 if ((grp == sbi->s_groups_count) &&
2887                    !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2888                         grp = i;
2889
2890                 block_bitmap = ext4_block_bitmap(sb, gdp);
2891                 if (block_bitmap == sb_block) {
2892                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2893                                  "Block bitmap for group %u overlaps "
2894                                  "superblock", i);
2895                         if (!sb_rdonly(sb))
2896                                 return 0;
2897                 }
2898                 if (block_bitmap >= sb_block + 1 &&
2899                     block_bitmap <= last_bg_block) {
2900                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2901                                  "Block bitmap for group %u overlaps "
2902                                  "block group descriptors", i);
2903                         if (!sb_rdonly(sb))
2904                                 return 0;
2905                 }
2906                 if (block_bitmap < first_block || block_bitmap > last_block) {
2907                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2908                                "Block bitmap for group %u not in group "
2909                                "(block %llu)!", i, block_bitmap);
2910                         return 0;
2911                 }
2912                 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2913                 if (inode_bitmap == sb_block) {
2914                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2915                                  "Inode bitmap for group %u overlaps "
2916                                  "superblock", i);
2917                         if (!sb_rdonly(sb))
2918                                 return 0;
2919                 }
2920                 if (inode_bitmap >= sb_block + 1 &&
2921                     inode_bitmap <= last_bg_block) {
2922                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2923                                  "Inode bitmap for group %u overlaps "
2924                                  "block group descriptors", i);
2925                         if (!sb_rdonly(sb))
2926                                 return 0;
2927                 }
2928                 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2929                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2930                                "Inode bitmap for group %u not in group "
2931                                "(block %llu)!", i, inode_bitmap);
2932                         return 0;
2933                 }
2934                 inode_table = ext4_inode_table(sb, gdp);
2935                 if (inode_table == sb_block) {
2936                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2937                                  "Inode table for group %u overlaps "
2938                                  "superblock", i);
2939                         if (!sb_rdonly(sb))
2940                                 return 0;
2941                 }
2942                 if (inode_table >= sb_block + 1 &&
2943                     inode_table <= last_bg_block) {
2944                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2945                                  "Inode table for group %u overlaps "
2946                                  "block group descriptors", i);
2947                         if (!sb_rdonly(sb))
2948                                 return 0;
2949                 }
2950                 if (inode_table < first_block ||
2951                     inode_table + sbi->s_itb_per_group - 1 > last_block) {
2952                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2953                                "Inode table for group %u not in group "
2954                                "(block %llu)!", i, inode_table);
2955                         return 0;
2956                 }
2957                 ext4_lock_group(sb, i);
2958                 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2959                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2960                                  "Checksum for group %u failed (%u!=%u)",
2961                                  i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2962                                      gdp)), le16_to_cpu(gdp->bg_checksum));
2963                         if (!sb_rdonly(sb)) {
2964                                 ext4_unlock_group(sb, i);
2965                                 return 0;
2966                         }
2967                 }
2968                 ext4_unlock_group(sb, i);
2969                 if (!flexbg_flag)
2970                         first_block += EXT4_BLOCKS_PER_GROUP(sb);
2971         }
2972         if (NULL != first_not_zeroed)
2973                 *first_not_zeroed = grp;
2974         return 1;
2975 }
2976
2977 /*
2978  * Maximal extent format file size.
2979  * Resulting logical blkno at s_maxbytes must fit in our on-disk
2980  * extent format containers, within a sector_t, and within i_blocks
2981  * in the vfs.  ext4 inode has 48 bits of i_block in fsblock units,
2982  * so that won't be a limiting factor.
2983  *
2984  * However there is other limiting factor. We do store extents in the form
2985  * of starting block and length, hence the resulting length of the extent
2986  * covering maximum file size must fit into on-disk format containers as
2987  * well. Given that length is always by 1 unit bigger than max unit (because
2988  * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2989  *
2990  * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2991  */
2992 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2993 {
2994         loff_t res;
2995         loff_t upper_limit = MAX_LFS_FILESIZE;
2996
2997         BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
2998
2999         if (!has_huge_files) {
3000                 upper_limit = (1LL << 32) - 1;
3001
3002                 /* total blocks in file system block size */
3003                 upper_limit >>= (blkbits - 9);
3004                 upper_limit <<= blkbits;
3005         }
3006
3007         /*
3008          * 32-bit extent-start container, ee_block. We lower the maxbytes
3009          * by one fs block, so ee_len can cover the extent of maximum file
3010          * size
3011          */
3012         res = (1LL << 32) - 1;
3013         res <<= blkbits;
3014
3015         /* Sanity check against vm- & vfs- imposed limits */
3016         if (res > upper_limit)
3017                 res = upper_limit;
3018
3019         return res;
3020 }
3021
3022 /*
3023  * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
3024  * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
3025  * We need to be 1 filesystem block less than the 2^48 sector limit.
3026  */
3027 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
3028 {
3029         unsigned long long upper_limit, res = EXT4_NDIR_BLOCKS;
3030         int meta_blocks;
3031
3032         /*
3033          * This is calculated to be the largest file size for a dense, block
3034          * mapped file such that the file's total number of 512-byte sectors,
3035          * including data and all indirect blocks, does not exceed (2^48 - 1).
3036          *
3037          * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
3038          * number of 512-byte sectors of the file.
3039          */
3040         if (!has_huge_files) {
3041                 /*
3042                  * !has_huge_files or implies that the inode i_block field
3043                  * represents total file blocks in 2^32 512-byte sectors ==
3044                  * size of vfs inode i_blocks * 8
3045                  */
3046                 upper_limit = (1LL << 32) - 1;
3047
3048                 /* total blocks in file system block size */
3049                 upper_limit >>= (bits - 9);
3050
3051         } else {
3052                 /*
3053                  * We use 48 bit ext4_inode i_blocks
3054                  * With EXT4_HUGE_FILE_FL set the i_blocks
3055                  * represent total number of blocks in
3056                  * file system block size
3057                  */
3058                 upper_limit = (1LL << 48) - 1;
3059
3060         }
3061
3062         /* indirect blocks */
3063         meta_blocks = 1;
3064         /* double indirect blocks */
3065         meta_blocks += 1 + (1LL << (bits-2));
3066         /* tripple indirect blocks */
3067         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
3068
3069         upper_limit -= meta_blocks;
3070         upper_limit <<= bits;
3071
3072         res += 1LL << (bits-2);
3073         res += 1LL << (2*(bits-2));
3074         res += 1LL << (3*(bits-2));
3075         res <<= bits;
3076         if (res > upper_limit)
3077                 res = upper_limit;
3078
3079         if (res > MAX_LFS_FILESIZE)
3080                 res = MAX_LFS_FILESIZE;
3081
3082         return (loff_t)res;
3083 }
3084
3085 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
3086                                    ext4_fsblk_t logical_sb_block, int nr)
3087 {
3088         struct ext4_sb_info *sbi = EXT4_SB(sb);
3089         ext4_group_t bg, first_meta_bg;
3090         int has_super = 0;
3091
3092         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
3093
3094         if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
3095                 return logical_sb_block + nr + 1;
3096         bg = sbi->s_desc_per_block * nr;
3097         if (ext4_bg_has_super(sb, bg))
3098                 has_super = 1;
3099
3100         /*
3101          * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
3102          * block 2, not 1.  If s_first_data_block == 0 (bigalloc is enabled
3103          * on modern mke2fs or blksize > 1k on older mke2fs) then we must
3104          * compensate.
3105          */
3106         if (sb->s_blocksize == 1024 && nr == 0 &&
3107             le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
3108                 has_super++;
3109
3110         return (has_super + ext4_group_first_block_no(sb, bg));
3111 }
3112
3113 /**
3114  * ext4_get_stripe_size: Get the stripe size.
3115  * @sbi: In memory super block info
3116  *
3117  * If we have specified it via mount option, then
3118  * use the mount option value. If the value specified at mount time is
3119  * greater than the blocks per group use the super block value.
3120  * If the super block value is greater than blocks per group return 0.
3121  * Allocator needs it be less than blocks per group.
3122  *
3123  */
3124 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
3125 {
3126         unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
3127         unsigned long stripe_width =
3128                         le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3129         int ret;
3130
3131         if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3132                 ret = sbi->s_stripe;
3133         else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3134                 ret = stripe_width;
3135         else if (stride && stride <= sbi->s_blocks_per_group)
3136                 ret = stride;
3137         else
3138                 ret = 0;
3139
3140         /*
3141          * If the stripe width is 1, this makes no sense and
3142          * we set it to 0 to turn off stripe handling code.
3143          */
3144         if (ret <= 1)
3145                 ret = 0;
3146
3147         return ret;
3148 }
3149
3150 /*
3151  * Check whether this filesystem can be mounted based on
3152  * the features present and the RDONLY/RDWR mount requested.
3153  * Returns 1 if this filesystem can be mounted as requested,
3154  * 0 if it cannot be.
3155  */
3156 int ext4_feature_set_ok(struct super_block *sb, int readonly)
3157 {
3158         if (ext4_has_unknown_ext4_incompat_features(sb)) {
3159                 ext4_msg(sb, KERN_ERR,
3160                         "Couldn't mount because of "
3161                         "unsupported optional features (%x)",
3162                         (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
3163                         ~EXT4_FEATURE_INCOMPAT_SUPP));
3164                 return 0;
3165         }
3166
3167 #ifndef CONFIG_UNICODE
3168         if (ext4_has_feature_casefold(sb)) {
3169                 ext4_msg(sb, KERN_ERR,
3170                          "Filesystem with casefold feature cannot be "
3171                          "mounted without CONFIG_UNICODE");
3172                 return 0;
3173         }
3174 #endif
3175
3176         if (readonly)
3177                 return 1;
3178
3179         if (ext4_has_feature_readonly(sb)) {
3180                 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
3181                 sb->s_flags |= SB_RDONLY;
3182                 return 1;
3183         }
3184
3185         /* Check that feature set is OK for a read-write mount */
3186         if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
3187                 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
3188                          "unsupported optional features (%x)",
3189                          (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
3190                                 ~EXT4_FEATURE_RO_COMPAT_SUPP));
3191                 return 0;
3192         }
3193         if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
3194                 ext4_msg(sb, KERN_ERR,
3195                          "Can't support bigalloc feature without "
3196                          "extents feature\n");
3197                 return 0;
3198         }
3199
3200 #if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
3201         if (!readonly && (ext4_has_feature_quota(sb) ||
3202                           ext4_has_feature_project(sb))) {
3203                 ext4_msg(sb, KERN_ERR,
3204                          "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
3205                 return 0;
3206         }
3207 #endif  /* CONFIG_QUOTA */
3208         return 1;
3209 }
3210
3211 /*
3212  * This function is called once a day if we have errors logged
3213  * on the file system
3214  */
3215 static void print_daily_error_info(struct timer_list *t)
3216 {
3217         struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
3218         struct super_block *sb = sbi->s_sb;
3219         struct ext4_super_block *es = sbi->s_es;
3220
3221         if (es->s_error_count)
3222                 /* fsck newer than v1.41.13 is needed to clean this condition. */
3223                 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
3224                          le32_to_cpu(es->s_error_count));
3225         if (es->s_first_error_time) {
3226                 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3227                        sb->s_id,
3228                        ext4_get_tstamp(es, s_first_error_time),
3229                        (int) sizeof(es->s_first_error_func),
3230                        es->s_first_error_func,
3231                        le32_to_cpu(es->s_first_error_line));
3232                 if (es->s_first_error_ino)
3233                         printk(KERN_CONT ": inode %u",
3234                                le32_to_cpu(es->s_first_error_ino));
3235                 if (es->s_first_error_block)
3236                         printk(KERN_CONT ": block %llu", (unsigned long long)
3237                                le64_to_cpu(es->s_first_error_block));
3238                 printk(KERN_CONT "\n");
3239         }
3240         if (es->s_last_error_time) {
3241                 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3242                        sb->s_id,
3243                        ext4_get_tstamp(es, s_last_error_time),
3244                        (int) sizeof(es->s_last_error_func),
3245                        es->s_last_error_func,
3246                        le32_to_cpu(es->s_last_error_line));
3247                 if (es->s_last_error_ino)
3248                         printk(KERN_CONT ": inode %u",
3249                                le32_to_cpu(es->s_last_error_ino));
3250                 if (es->s_last_error_block)
3251                         printk(KERN_CONT ": block %llu", (unsigned long long)
3252                                le64_to_cpu(es->s_last_error_block));
3253                 printk(KERN_CONT "\n");
3254         }
3255         mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
3256 }
3257
3258 /* Find next suitable group and run ext4_init_inode_table */
3259 static int ext4_run_li_request(struct ext4_li_request *elr)
3260 {
3261         struct ext4_group_desc *gdp = NULL;
3262         struct super_block *sb = elr->lr_super;
3263         ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3264         ext4_group_t group = elr->lr_next_group;
3265         unsigned long timeout = 0;
3266         unsigned int prefetch_ios = 0;
3267         int ret = 0;
3268
3269         if (elr->lr_mode == EXT4_LI_MODE_PREFETCH_BBITMAP) {
3270                 elr->lr_next_group = ext4_mb_prefetch(sb, group,
3271                                 EXT4_SB(sb)->s_mb_prefetch, &prefetch_ios);
3272                 if (prefetch_ios)
3273                         ext4_mb_prefetch_fini(sb, elr->lr_next_group,
3274                                               prefetch_ios);
3275                 trace_ext4_prefetch_bitmaps(sb, group, elr->lr_next_group,
3276                                             prefetch_ios);
3277                 if (group >= elr->lr_next_group) {
3278                         ret = 1;
3279                         if (elr->lr_first_not_zeroed != ngroups &&
3280                             !sb_rdonly(sb) && test_opt(sb, INIT_INODE_TABLE)) {
3281                                 elr->lr_next_group = elr->lr_first_not_zeroed;
3282                                 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3283                                 ret = 0;
3284                         }
3285                 }
3286                 return ret;
3287         }
3288
3289         for (; group < ngroups; group++) {
3290                 gdp = ext4_get_group_desc(sb, group, NULL);
3291                 if (!gdp) {
3292                         ret = 1;
3293                         break;
3294                 }
3295
3296                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3297                         break;
3298         }
3299
3300         if (group >= ngroups)
3301                 ret = 1;
3302
3303         if (!ret) {
3304                 timeout = jiffies;
3305                 ret = ext4_init_inode_table(sb, group,
3306                                             elr->lr_timeout ? 0 : 1);
3307                 trace_ext4_lazy_itable_init(sb, group);
3308                 if (elr->lr_timeout == 0) {
3309                         timeout = (jiffies - timeout) *
3310                                 EXT4_SB(elr->lr_super)->s_li_wait_mult;
3311                         elr->lr_timeout = timeout;
3312                 }
3313                 elr->lr_next_sched = jiffies + elr->lr_timeout;
3314                 elr->lr_next_group = group + 1;
3315         }
3316         return ret;
3317 }
3318
3319 /*
3320  * Remove lr_request from the list_request and free the
3321  * request structure. Should be called with li_list_mtx held
3322  */
3323 static void ext4_remove_li_request(struct ext4_li_request *elr)
3324 {
3325         if (!elr)
3326                 return;
3327
3328         list_del(&elr->lr_request);
3329         EXT4_SB(elr->lr_super)->s_li_request = NULL;
3330         kfree(elr);
3331 }
3332
3333 static void ext4_unregister_li_request(struct super_block *sb)
3334 {
3335         mutex_lock(&ext4_li_mtx);
3336         if (!ext4_li_info) {
3337                 mutex_unlock(&ext4_li_mtx);
3338                 return;
3339         }
3340
3341         mutex_lock(&ext4_li_info->li_list_mtx);
3342         ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
3343         mutex_unlock(&ext4_li_info->li_list_mtx);
3344         mutex_unlock(&ext4_li_mtx);
3345 }
3346
3347 static struct task_struct *ext4_lazyinit_task;
3348
3349 /*
3350  * This is the function where ext4lazyinit thread lives. It walks
3351  * through the request list searching for next scheduled filesystem.
3352  * When such a fs is found, run the lazy initialization request
3353  * (ext4_rn_li_request) and keep track of the time spend in this
3354  * function. Based on that time we compute next schedule time of
3355  * the request. When walking through the list is complete, compute
3356  * next waking time and put itself into sleep.
3357  */
3358 static int ext4_lazyinit_thread(void *arg)
3359 {
3360         struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3361         struct list_head *pos, *n;
3362         struct ext4_li_request *elr;
3363         unsigned long next_wakeup, cur;
3364
3365         BUG_ON(NULL == eli);
3366
3367 cont_thread:
3368         while (true) {
3369                 next_wakeup = MAX_JIFFY_OFFSET;
3370
3371                 mutex_lock(&eli->li_list_mtx);
3372                 if (list_empty(&eli->li_request_list)) {
3373                         mutex_unlock(&eli->li_list_mtx);
3374                         goto exit_thread;
3375                 }
3376                 list_for_each_safe(pos, n, &eli->li_request_list) {
3377                         int err = 0;
3378                         int progress = 0;
3379                         elr = list_entry(pos, struct ext4_li_request,
3380                                          lr_request);
3381
3382                         if (time_before(jiffies, elr->lr_next_sched)) {
3383                                 if (time_before(elr->lr_next_sched, next_wakeup))
3384                                         next_wakeup = elr->lr_next_sched;
3385                                 continue;
3386                         }
3387                         if (down_read_trylock(&elr->lr_super->s_umount)) {
3388                                 if (sb_start_write_trylock(elr->lr_super)) {
3389                                         progress = 1;
3390                                         /*
3391                                          * We hold sb->s_umount, sb can not
3392                                          * be removed from the list, it is
3393                                          * now safe to drop li_list_mtx
3394                                          */
3395                                         mutex_unlock(&eli->li_list_mtx);
3396                                         err = ext4_run_li_request(elr);
3397                                         sb_end_write(elr->lr_super);
3398                                         mutex_lock(&eli->li_list_mtx);
3399                                         n = pos->next;
3400                                 }
3401                                 up_read((&elr->lr_super->s_umount));
3402                         }
3403                         /* error, remove the lazy_init job */
3404                         if (err) {
3405                                 ext4_remove_li_request(elr);
3406                                 continue;
3407                         }
3408                         if (!progress) {
3409                                 elr->lr_next_sched = jiffies +
3410                                         (prandom_u32()
3411                                          % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3412                         }
3413                         if (time_before(elr->lr_next_sched, next_wakeup))
3414                                 next_wakeup = elr->lr_next_sched;
3415                 }
3416                 mutex_unlock(&eli->li_list_mtx);
3417
3418                 try_to_freeze();
3419
3420                 cur = jiffies;
3421                 if ((time_after_eq(cur, next_wakeup)) ||
3422                     (MAX_JIFFY_OFFSET == next_wakeup)) {
3423                         cond_resched();
3424                         continue;
3425                 }
3426
3427                 schedule_timeout_interruptible(next_wakeup - cur);
3428
3429                 if (kthread_should_stop()) {
3430                         ext4_clear_request_list();
3431                         goto exit_thread;
3432                 }
3433         }
3434
3435 exit_thread:
3436         /*
3437          * It looks like the request list is empty, but we need
3438          * to check it under the li_list_mtx lock, to prevent any
3439          * additions into it, and of course we should lock ext4_li_mtx
3440          * to atomically free the list and ext4_li_info, because at
3441          * this point another ext4 filesystem could be registering
3442          * new one.
3443          */
3444         mutex_lock(&ext4_li_mtx);
3445         mutex_lock(&eli->li_list_mtx);
3446         if (!list_empty(&eli->li_request_list)) {
3447                 mutex_unlock(&eli->li_list_mtx);
3448                 mutex_unlock(&ext4_li_mtx);
3449                 goto cont_thread;
3450         }
3451         mutex_unlock(&eli->li_list_mtx);
3452         kfree(ext4_li_info);
3453         ext4_li_info = NULL;
3454         mutex_unlock(&ext4_li_mtx);
3455
3456         return 0;
3457 }
3458
3459 static void ext4_clear_request_list(void)
3460 {
3461         struct list_head *pos, *n;
3462         struct ext4_li_request *elr;
3463
3464         mutex_lock(&ext4_li_info->li_list_mtx);
3465         list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3466                 elr = list_entry(pos, struct ext4_li_request,
3467                                  lr_request);
3468                 ext4_remove_li_request(elr);
3469         }
3470         mutex_unlock(&ext4_li_info->li_list_mtx);
3471 }
3472
3473 static int ext4_run_lazyinit_thread(void)
3474 {
3475         ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3476                                          ext4_li_info, "ext4lazyinit");
3477         if (IS_ERR(ext4_lazyinit_task)) {
3478                 int err = PTR_ERR(ext4_lazyinit_task);
3479                 ext4_clear_request_list();
3480                 kfree(ext4_li_info);
3481                 ext4_li_info = NULL;
3482                 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3483                                  "initialization thread\n",
3484                                  err);
3485                 return err;
3486         }
3487         ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3488         return 0;
3489 }
3490
3491 /*
3492  * Check whether it make sense to run itable init. thread or not.
3493  * If there is at least one uninitialized inode table, return
3494  * corresponding group number, else the loop goes through all
3495  * groups and return total number of groups.
3496  */
3497 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3498 {
3499         ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3500         struct ext4_group_desc *gdp = NULL;
3501
3502         if (!ext4_has_group_desc_csum(sb))
3503                 return ngroups;
3504
3505         for (group = 0; group < ngroups; group++) {
3506                 gdp = ext4_get_group_desc(sb, group, NULL);
3507                 if (!gdp)
3508                         continue;
3509
3510                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3511                         break;
3512         }
3513
3514         return group;
3515 }
3516
3517 static int ext4_li_info_new(void)
3518 {
3519         struct ext4_lazy_init *eli = NULL;
3520
3521         eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3522         if (!eli)
3523                 return -ENOMEM;
3524
3525         INIT_LIST_HEAD(&eli->li_request_list);
3526         mutex_init(&eli->li_list_mtx);
3527
3528         eli->li_state |= EXT4_LAZYINIT_QUIT;
3529
3530         ext4_li_info = eli;
3531
3532         return 0;
3533 }
3534
3535 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3536                                             ext4_group_t start)
3537 {
3538         struct ext4_li_request *elr;
3539
3540         elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3541         if (!elr)
3542                 return NULL;
3543
3544         elr->lr_super = sb;
3545         elr->lr_first_not_zeroed = start;
3546         if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS)) {
3547                 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3548                 elr->lr_next_group = start;
3549         } else {
3550                 elr->lr_mode = EXT4_LI_MODE_PREFETCH_BBITMAP;
3551         }
3552
3553         /*
3554          * Randomize first schedule time of the request to
3555          * spread the inode table initialization requests
3556          * better.
3557          */
3558         elr->lr_next_sched = jiffies + (prandom_u32() %
3559                                 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3560         return elr;
3561 }
3562
3563 int ext4_register_li_request(struct super_block *sb,
3564                              ext4_group_t first_not_zeroed)
3565 {
3566         struct ext4_sb_info *sbi = EXT4_SB(sb);
3567         struct ext4_li_request *elr = NULL;
3568         ext4_group_t ngroups = sbi->s_groups_count;
3569         int ret = 0;
3570
3571         mutex_lock(&ext4_li_mtx);
3572         if (sbi->s_li_request != NULL) {
3573                 /*
3574                  * Reset timeout so it can be computed again, because
3575                  * s_li_wait_mult might have changed.
3576                  */
3577                 sbi->s_li_request->lr_timeout = 0;
3578                 goto out;
3579         }
3580
3581         if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) &&
3582             (first_not_zeroed == ngroups || sb_rdonly(sb) ||
3583              !test_opt(sb, INIT_INODE_TABLE)))
3584                 goto out;
3585
3586         elr = ext4_li_request_new(sb, first_not_zeroed);
3587         if (!elr) {
3588                 ret = -ENOMEM;
3589                 goto out;
3590         }
3591
3592         if (NULL == ext4_li_info) {
3593                 ret = ext4_li_info_new();
3594                 if (ret)
3595                         goto out;
3596         }
3597
3598         mutex_lock(&ext4_li_info->li_list_mtx);
3599         list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3600         mutex_unlock(&ext4_li_info->li_list_mtx);
3601
3602         sbi->s_li_request = elr;
3603         /*
3604          * set elr to NULL here since it has been inserted to
3605          * the request_list and the removal and free of it is
3606          * handled by ext4_clear_request_list from now on.
3607          */
3608         elr = NULL;
3609
3610         if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3611                 ret = ext4_run_lazyinit_thread();
3612                 if (ret)
3613                         goto out;
3614         }
3615 out:
3616         mutex_unlock(&ext4_li_mtx);
3617         if (ret)
3618                 kfree(elr);
3619         return ret;
3620 }
3621
3622 /*
3623  * We do not need to lock anything since this is called on
3624  * module unload.
3625  */
3626 static void ext4_destroy_lazyinit_thread(void)
3627 {
3628         /*
3629          * If thread exited earlier
3630          * there's nothing to be done.
3631          */
3632         if (!ext4_li_info || !ext4_lazyinit_task)
3633                 return;
3634
3635         kthread_stop(ext4_lazyinit_task);
3636 }
3637
3638 static int set_journal_csum_feature_set(struct super_block *sb)
3639 {
3640         int ret = 1;
3641         int compat, incompat;
3642         struct ext4_sb_info *sbi = EXT4_SB(sb);
3643
3644         if (ext4_has_metadata_csum(sb)) {
3645                 /* journal checksum v3 */
3646                 compat = 0;
3647                 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
3648         } else {
3649                 /* journal checksum v1 */
3650                 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3651                 incompat = 0;
3652         }
3653
3654         jbd2_journal_clear_features(sbi->s_journal,
3655                         JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3656                         JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3657                         JBD2_FEATURE_INCOMPAT_CSUM_V2);
3658         if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3659                 ret = jbd2_journal_set_features(sbi->s_journal,
3660                                 compat, 0,
3661                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3662                                 incompat);
3663         } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3664                 ret = jbd2_journal_set_features(sbi->s_journal,
3665                                 compat, 0,
3666                                 incompat);
3667                 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3668                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3669         } else {
3670                 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3671                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3672         }
3673
3674         return ret;
3675 }
3676
3677 /*
3678  * Note: calculating the overhead so we can be compatible with
3679  * historical BSD practice is quite difficult in the face of
3680  * clusters/bigalloc.  This is because multiple metadata blocks from
3681  * different block group can end up in the same allocation cluster.
3682  * Calculating the exact overhead in the face of clustered allocation
3683  * requires either O(all block bitmaps) in memory or O(number of block
3684  * groups**2) in time.  We will still calculate the superblock for
3685  * older file systems --- and if we come across with a bigalloc file
3686  * system with zero in s_overhead_clusters the estimate will be close to
3687  * correct especially for very large cluster sizes --- but for newer
3688  * file systems, it's better to calculate this figure once at mkfs
3689  * time, and store it in the superblock.  If the superblock value is
3690  * present (even for non-bigalloc file systems), we will use it.
3691  */
3692 static int count_overhead(struct super_block *sb, ext4_group_t grp,
3693                           char *buf)
3694 {
3695         struct ext4_sb_info     *sbi = EXT4_SB(sb);
3696         struct ext4_group_desc  *gdp;
3697         ext4_fsblk_t            first_block, last_block, b;
3698         ext4_group_t            i, ngroups = ext4_get_groups_count(sb);
3699         int                     s, j, count = 0;
3700
3701         if (!ext4_has_feature_bigalloc(sb))
3702                 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3703                         sbi->s_itb_per_group + 2);
3704
3705         first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3706                 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3707         last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3708         for (i = 0; i < ngroups; i++) {
3709                 gdp = ext4_get_group_desc(sb, i, NULL);
3710                 b = ext4_block_bitmap(sb, gdp);
3711                 if (b >= first_block && b <= last_block) {
3712                         ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3713                         count++;
3714                 }
3715                 b = ext4_inode_bitmap(sb, gdp);
3716                 if (b >= first_block && b <= last_block) {
3717                         ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3718                         count++;
3719                 }
3720                 b = ext4_inode_table(sb, gdp);
3721                 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3722                         for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3723                                 int c = EXT4_B2C(sbi, b - first_block);
3724                                 ext4_set_bit(c, buf);
3725                                 count++;
3726                         }
3727                 if (i != grp)
3728                         continue;
3729                 s = 0;
3730                 if (ext4_bg_has_super(sb, grp)) {
3731                         ext4_set_bit(s++, buf);
3732                         count++;
3733                 }
3734                 j = ext4_bg_num_gdb(sb, grp);
3735                 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3736                         ext4_error(sb, "Invalid number of block group "
3737                                    "descriptor blocks: %d", j);
3738                         j = EXT4_BLOCKS_PER_GROUP(sb) - s;
3739                 }
3740                 count += j;
3741                 for (; j > 0; j--)
3742                         ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3743         }
3744         if (!count)
3745                 return 0;
3746         return EXT4_CLUSTERS_PER_GROUP(sb) -
3747                 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3748 }
3749
3750 /*
3751  * Compute the overhead and stash it in sbi->s_overhead
3752  */
3753 int ext4_calculate_overhead(struct super_block *sb)
3754 {
3755         struct ext4_sb_info *sbi = EXT4_SB(sb);
3756         struct ext4_super_block *es = sbi->s_es;
3757         struct inode *j_inode;
3758         unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
3759         ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3760         ext4_fsblk_t overhead = 0;
3761         char *buf = (char *) get_zeroed_page(GFP_NOFS);
3762
3763         if (!buf)
3764                 return -ENOMEM;
3765
3766         /*
3767          * Compute the overhead (FS structures).  This is constant
3768          * for a given filesystem unless the number of block groups
3769          * changes so we cache the previous value until it does.
3770          */
3771
3772         /*
3773          * All of the blocks before first_data_block are overhead
3774          */
3775         overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3776
3777         /*
3778          * Add the overhead found in each block group
3779          */
3780         for (i = 0; i < ngroups; i++) {
3781                 int blks;
3782
3783                 blks = count_overhead(sb, i, buf);
3784                 overhead += blks;
3785                 if (blks)
3786                         memset(buf, 0, PAGE_SIZE);
3787                 cond_resched();
3788         }
3789
3790         /*
3791          * Add the internal journal blocks whether the journal has been
3792          * loaded or not
3793          */
3794         if (sbi->s_journal && !sbi->s_journal_bdev)
3795                 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_total_len);
3796         else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {
3797                 /* j_inum for internal journal is non-zero */
3798                 j_inode = ext4_get_journal_inode(sb, j_inum);
3799                 if (j_inode) {
3800                         j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3801                         overhead += EXT4_NUM_B2C(sbi, j_blocks);
3802                         iput(j_inode);
3803                 } else {
3804                         ext4_msg(sb, KERN_ERR, "can't get journal size");
3805                 }
3806         }
3807         sbi->s_overhead = overhead;
3808         smp_wmb();
3809         free_page((unsigned long) buf);
3810         return 0;
3811 }
3812
3813 static void ext4_set_resv_clusters(struct super_block *sb)
3814 {
3815         ext4_fsblk_t resv_clusters;
3816         struct ext4_sb_info *sbi = EXT4_SB(sb);
3817
3818         /*
3819          * There's no need to reserve anything when we aren't using extents.
3820          * The space estimates are exact, there are no unwritten extents,
3821          * hole punching doesn't need new metadata... This is needed especially
3822          * to keep ext2/3 backward compatibility.
3823          */
3824         if (!ext4_has_feature_extents(sb))
3825                 return;
3826         /*
3827          * By default we reserve 2% or 4096 clusters, whichever is smaller.
3828          * This should cover the situations where we can not afford to run
3829          * out of space like for example punch hole, or converting
3830          * unwritten extents in delalloc path. In most cases such
3831          * allocation would require 1, or 2 blocks, higher numbers are
3832          * very rare.
3833          */
3834         resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3835                          sbi->s_cluster_bits);
3836
3837         do_div(resv_clusters, 50);
3838         resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3839
3840         atomic64_set(&sbi->s_resv_clusters, resv_clusters);
3841 }
3842
3843 static const char *ext4_quota_mode(struct super_block *sb)
3844 {
3845 #ifdef CONFIG_QUOTA
3846         if (!ext4_quota_capable(sb))
3847                 return "none";
3848
3849         if (EXT4_SB(sb)->s_journal && ext4_is_quota_journalled(sb))
3850                 return "journalled";
3851         else
3852                 return "writeback";
3853 #else
3854         return "disabled";
3855 #endif
3856 }
3857
3858 static void ext4_setup_csum_trigger(struct super_block *sb,
3859                                     enum ext4_journal_trigger_type type,
3860                                     void (*trigger)(
3861                                         struct jbd2_buffer_trigger_type *type,
3862                                         struct buffer_head *bh,
3863                                         void *mapped_data,
3864                                         size_t size))
3865 {
3866         struct ext4_sb_info *sbi = EXT4_SB(sb);
3867
3868         sbi->s_journal_triggers[type].sb = sb;
3869         sbi->s_journal_triggers[type].tr_triggers.t_frozen = trigger;
3870 }
3871
3872 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3873 {
3874         struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
3875         char *orig_data = kstrdup(data, GFP_KERNEL);
3876         struct buffer_head *bh, **group_desc;
3877         struct ext4_super_block *es = NULL;
3878         struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3879         struct flex_groups **flex_groups;
3880         ext4_fsblk_t block;
3881         ext4_fsblk_t sb_block = get_sb_block(&data);
3882         ext4_fsblk_t logical_sb_block;
3883         unsigned long offset = 0;
3884         unsigned long def_mount_opts;
3885         struct inode *root;
3886         const char *descr;
3887         int ret = -ENOMEM;
3888         int blocksize, clustersize;
3889         unsigned int db_count;
3890         unsigned int i;
3891         int needs_recovery, has_huge_files;
3892         __u64 blocks_count;
3893         int err = 0;
3894         ext4_group_t first_not_zeroed;
3895         struct ext4_parsed_options parsed_opts;
3896
3897         /* Set defaults for the variables that will be set during parsing */
3898         parsed_opts.journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3899         parsed_opts.journal_devnum = 0;
3900         parsed_opts.mb_optimize_scan = DEFAULT_MB_OPTIMIZE_SCAN;
3901
3902         if ((data && !orig_data) || !sbi)
3903                 goto out_free_base;
3904
3905         sbi->s_daxdev = dax_dev;
3906         sbi->s_blockgroup_lock =
3907                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3908         if (!sbi->s_blockgroup_lock)
3909                 goto out_free_base;
3910
3911         sb->s_fs_info = sbi;
3912         sbi->s_sb = sb;
3913         sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3914         sbi->s_sb_block = sb_block;
3915         sbi->s_sectors_written_start =
3916                 part_stat_read(sb->s_bdev, sectors[STAT_WRITE]);
3917
3918         /* Cleanup superblock name */
3919         strreplace(sb->s_id, '/', '!');
3920
3921         /* -EINVAL is default */
3922         ret = -EINVAL;
3923         blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3924         if (!blocksize) {
3925                 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3926                 goto out_fail;
3927         }
3928
3929         /*
3930          * The ext4 superblock will not be buffer aligned for other than 1kB
3931          * block sizes.  We need to calculate the offset from buffer start.
3932          */
3933         if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3934                 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3935                 offset = do_div(logical_sb_block, blocksize);
3936         } else {
3937                 logical_sb_block = sb_block;
3938         }
3939
3940         bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
3941         if (IS_ERR(bh)) {
3942                 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3943                 ret = PTR_ERR(bh);
3944                 goto out_fail;
3945         }
3946         /*
3947          * Note: s_es must be initialized as soon as possible because
3948          *       some ext4 macro-instructions depend on its value
3949          */
3950         es = (struct ext4_super_block *) (bh->b_data + offset);
3951         sbi->s_es = es;
3952         sb->s_magic = le16_to_cpu(es->s_magic);
3953         if (sb->s_magic != EXT4_SUPER_MAGIC)
3954                 goto cantfind_ext4;
3955         sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3956
3957         /* Warn if metadata_csum and gdt_csum are both set. */
3958         if (ext4_has_feature_metadata_csum(sb) &&
3959             ext4_has_feature_gdt_csum(sb))
3960                 ext4_warning(sb, "metadata_csum and uninit_bg are "
3961                              "redundant flags; please run fsck.");
3962
3963         /* Check for a known checksum algorithm */
3964         if (!ext4_verify_csum_type(sb, es)) {
3965                 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3966                          "unknown checksum algorithm.");
3967                 silent = 1;
3968                 goto cantfind_ext4;
3969         }
3970         ext4_setup_csum_trigger(sb, EXT4_JTR_ORPHAN_FILE,
3971                                 ext4_orphan_file_block_trigger);
3972
3973         /* Load the checksum driver */
3974         sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3975         if (IS_ERR(sbi->s_chksum_driver)) {
3976                 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3977                 ret = PTR_ERR(sbi->s_chksum_driver);
3978                 sbi->s_chksum_driver = NULL;
3979                 goto failed_mount;
3980         }
3981
3982         /* Check superblock checksum */
3983         if (!ext4_superblock_csum_verify(sb, es)) {
3984                 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3985                          "invalid superblock checksum.  Run e2fsck?");
3986                 silent = 1;
3987                 ret = -EFSBADCRC;
3988                 goto cantfind_ext4;
3989         }
3990
3991         /* Precompute checksum seed for all metadata */
3992         if (ext4_has_feature_csum_seed(sb))
3993                 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3994         else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
3995                 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3996                                                sizeof(es->s_uuid));
3997
3998         /* Set defaults before we parse the mount options */
3999         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
4000         set_opt(sb, INIT_INODE_TABLE);
4001         if (def_mount_opts & EXT4_DEFM_DEBUG)
4002                 set_opt(sb, DEBUG);
4003         if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
4004                 set_opt(sb, GRPID);
4005         if (def_mount_opts & EXT4_DEFM_UID16)
4006                 set_opt(sb, NO_UID32);
4007         /* xattr user namespace & acls are now defaulted on */
4008         set_opt(sb, XATTR_USER);
4009 #ifdef CONFIG_EXT4_FS_POSIX_ACL
4010         set_opt(sb, POSIX_ACL);
4011 #endif
4012         if (ext4_has_feature_fast_commit(sb))
4013                 set_opt2(sb, JOURNAL_FAST_COMMIT);
4014         /* don't forget to enable journal_csum when metadata_csum is enabled. */
4015         if (ext4_has_metadata_csum(sb))
4016                 set_opt(sb, JOURNAL_CHECKSUM);
4017
4018         if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
4019                 set_opt(sb, JOURNAL_DATA);
4020         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
4021                 set_opt(sb, ORDERED_DATA);
4022         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
4023                 set_opt(sb, WRITEBACK_DATA);
4024
4025         if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
4026                 set_opt(sb, ERRORS_PANIC);
4027         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
4028                 set_opt(sb, ERRORS_CONT);
4029         else
4030                 set_opt(sb, ERRORS_RO);
4031         /* block_validity enabled by default; disable with noblock_validity */
4032         set_opt(sb, BLOCK_VALIDITY);
4033         if (def_mount_opts & EXT4_DEFM_DISCARD)
4034                 set_opt(sb, DISCARD);
4035
4036         sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
4037         sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
4038         sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
4039         sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
4040         sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
4041
4042         if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
4043                 set_opt(sb, BARRIER);
4044
4045         /*
4046          * enable delayed allocation by default
4047          * Use -o nodelalloc to turn it off
4048          */
4049         if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
4050             ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
4051                 set_opt(sb, DELALLOC);
4052
4053         /*
4054          * set default s_li_wait_mult for lazyinit, for the case there is
4055          * no mount option specified.
4056          */
4057         sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
4058
4059         if (le32_to_cpu(es->s_log_block_size) >
4060             (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4061                 ext4_msg(sb, KERN_ERR,
4062                          "Invalid log block size: %u",
4063                          le32_to_cpu(es->s_log_block_size));
4064                 goto failed_mount;
4065         }
4066         if (le32_to_cpu(es->s_log_cluster_size) >
4067             (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4068                 ext4_msg(sb, KERN_ERR,
4069                          "Invalid log cluster size: %u",
4070                          le32_to_cpu(es->s_log_cluster_size));
4071                 goto failed_mount;
4072         }
4073
4074         blocksize = EXT4_MIN_BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
4075
4076         if (blocksize == PAGE_SIZE)
4077                 set_opt(sb, DIOREAD_NOLOCK);
4078
4079         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
4080                 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
4081                 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
4082         } else {
4083                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
4084                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
4085                 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
4086                         ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
4087                                  sbi->s_first_ino);
4088                         goto failed_mount;
4089                 }
4090                 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
4091                     (!is_power_of_2(sbi->s_inode_size)) ||
4092                     (sbi->s_inode_size > blocksize)) {
4093                         ext4_msg(sb, KERN_ERR,
4094                                "unsupported inode size: %d",
4095                                sbi->s_inode_size);
4096                         ext4_msg(sb, KERN_ERR, "blocksize: %d", blocksize);
4097                         goto failed_mount;
4098                 }
4099                 /*
4100                  * i_atime_extra is the last extra field available for
4101                  * [acm]times in struct ext4_inode. Checking for that
4102                  * field should suffice to ensure we have extra space
4103                  * for all three.
4104                  */
4105                 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
4106                         sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
4107                         sb->s_time_gran = 1;
4108                         sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
4109                 } else {
4110                         sb->s_time_gran = NSEC_PER_SEC;
4111                         sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
4112                 }
4113                 sb->s_time_min = EXT4_TIMESTAMP_MIN;
4114         }
4115         if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4116                 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4117                         EXT4_GOOD_OLD_INODE_SIZE;
4118                 if (ext4_has_feature_extra_isize(sb)) {
4119                         unsigned v, max = (sbi->s_inode_size -
4120                                            EXT4_GOOD_OLD_INODE_SIZE);
4121
4122                         v = le16_to_cpu(es->s_want_extra_isize);
4123                         if (v > max) {
4124                                 ext4_msg(sb, KERN_ERR,
4125                                          "bad s_want_extra_isize: %d", v);
4126                                 goto failed_mount;
4127                         }
4128                         if (sbi->s_want_extra_isize < v)
4129                                 sbi->s_want_extra_isize = v;
4130
4131                         v = le16_to_cpu(es->s_min_extra_isize);
4132                         if (v > max) {
4133                                 ext4_msg(sb, KERN_ERR,
4134                                          "bad s_min_extra_isize: %d", v);
4135                                 goto failed_mount;
4136                         }
4137                         if (sbi->s_want_extra_isize < v)
4138                                 sbi->s_want_extra_isize = v;
4139                 }
4140         }
4141
4142         if (sbi->s_es->s_mount_opts[0]) {
4143                 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
4144                                               sizeof(sbi->s_es->s_mount_opts),
4145                                               GFP_KERNEL);
4146                 if (!s_mount_opts)
4147                         goto failed_mount;
4148                 if (!parse_options(s_mount_opts, sb, &parsed_opts, 0)) {
4149                         ext4_msg(sb, KERN_WARNING,
4150                                  "failed to parse options in superblock: %s",
4151                                  s_mount_opts);
4152                 }
4153                 kfree(s_mount_opts);
4154         }
4155         sbi->s_def_mount_opt = sbi->s_mount_opt;
4156         if (!parse_options((char *) data, sb, &parsed_opts, 0))
4157                 goto failed_mount;
4158
4159 #ifdef CONFIG_UNICODE
4160         if (ext4_has_feature_casefold(sb) && !sb->s_encoding) {
4161                 const struct ext4_sb_encodings *encoding_info;
4162                 struct unicode_map *encoding;
4163                 __u16 encoding_flags;
4164
4165                 if (ext4_sb_read_encoding(es, &encoding_info,
4166                                           &encoding_flags)) {
4167                         ext4_msg(sb, KERN_ERR,
4168                                  "Encoding requested by superblock is unknown");
4169                         goto failed_mount;
4170                 }
4171
4172                 encoding = utf8_load(encoding_info->version);
4173                 if (IS_ERR(encoding)) {
4174                         ext4_msg(sb, KERN_ERR,
4175                                  "can't mount with superblock charset: %s-%s "
4176                                  "not supported by the kernel. flags: 0x%x.",
4177                                  encoding_info->name, encoding_info->version,
4178                                  encoding_flags);
4179                         goto failed_mount;
4180                 }
4181                 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
4182                          "%s-%s with flags 0x%hx", encoding_info->name,
4183                          encoding_info->version?:"\b", encoding_flags);
4184
4185                 sb->s_encoding = encoding;
4186                 sb->s_encoding_flags = encoding_flags;
4187         }
4188 #endif
4189
4190         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4191                 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, O_DIRECT and fast_commit support!\n");
4192                 /* can't mount with both data=journal and dioread_nolock. */
4193                 clear_opt(sb, DIOREAD_NOLOCK);
4194                 clear_opt2(sb, JOURNAL_FAST_COMMIT);
4195                 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4196                         ext4_msg(sb, KERN_ERR, "can't mount with "
4197                                  "both data=journal and delalloc");
4198                         goto failed_mount;
4199                 }
4200                 if (test_opt(sb, DAX_ALWAYS)) {
4201                         ext4_msg(sb, KERN_ERR, "can't mount with "
4202                                  "both data=journal and dax");
4203                         goto failed_mount;
4204                 }
4205                 if (ext4_has_feature_encrypt(sb)) {
4206                         ext4_msg(sb, KERN_WARNING,
4207                                  "encrypted files will use data=ordered "
4208                                  "instead of data journaling mode");
4209                 }
4210                 if (test_opt(sb, DELALLOC))
4211                         clear_opt(sb, DELALLOC);
4212         } else {
4213                 sb->s_iflags |= SB_I_CGROUPWB;
4214         }
4215
4216         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
4217                 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
4218
4219         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
4220             (ext4_has_compat_features(sb) ||
4221              ext4_has_ro_compat_features(sb) ||
4222              ext4_has_incompat_features(sb)))
4223                 ext4_msg(sb, KERN_WARNING,
4224                        "feature flags set on rev 0 fs, "
4225                        "running e2fsck is recommended");
4226
4227         if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
4228                 set_opt2(sb, HURD_COMPAT);
4229                 if (ext4_has_feature_64bit(sb)) {
4230                         ext4_msg(sb, KERN_ERR,
4231                                  "The Hurd can't support 64-bit file systems");
4232                         goto failed_mount;
4233                 }
4234
4235                 /*
4236                  * ea_inode feature uses l_i_version field which is not
4237                  * available in HURD_COMPAT mode.
4238                  */
4239                 if (ext4_has_feature_ea_inode(sb)) {
4240                         ext4_msg(sb, KERN_ERR,
4241                                  "ea_inode feature is not supported for Hurd");
4242                         goto failed_mount;
4243                 }
4244         }
4245
4246         if (IS_EXT2_SB(sb)) {
4247                 if (ext2_feature_set_ok(sb))
4248                         ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
4249                                  "using the ext4 subsystem");
4250                 else {
4251                         /*
4252                          * If we're probing be silent, if this looks like
4253                          * it's actually an ext[34] filesystem.
4254                          */
4255                         if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4256                                 goto failed_mount;
4257                         ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
4258                                  "to feature incompatibilities");
4259                         goto failed_mount;
4260                 }
4261         }
4262
4263         if (IS_EXT3_SB(sb)) {
4264                 if (ext3_feature_set_ok(sb))
4265                         ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
4266                                  "using the ext4 subsystem");
4267                 else {
4268                         /*
4269                          * If we're probing be silent, if this looks like
4270                          * it's actually an ext4 filesystem.
4271                          */
4272                         if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4273                                 goto failed_mount;
4274                         ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
4275                                  "to feature incompatibilities");
4276                         goto failed_mount;
4277                 }
4278         }
4279
4280         /*
4281          * Check feature flags regardless of the revision level, since we
4282          * previously didn't change the revision level when setting the flags,
4283          * so there is a chance incompat flags are set on a rev 0 filesystem.
4284          */
4285         if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
4286                 goto failed_mount;
4287
4288         if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
4289                 ext4_msg(sb, KERN_ERR,
4290                          "Number of reserved GDT blocks insanely large: %d",
4291                          le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
4292                 goto failed_mount;
4293         }
4294
4295         if (dax_supported(dax_dev, sb->s_bdev, blocksize, 0,
4296                         bdev_nr_sectors(sb->s_bdev)))
4297                 set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags);
4298
4299         if (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) {
4300                 if (ext4_has_feature_inline_data(sb)) {
4301                         ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
4302                                         " that may contain inline data");
4303                         goto failed_mount;
4304                 }
4305                 if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags)) {
4306                         ext4_msg(sb, KERN_ERR,
4307                                 "DAX unsupported by block device.");
4308                         goto failed_mount;
4309                 }
4310         }
4311
4312         if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
4313                 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
4314                          es->s_encryption_level);
4315                 goto failed_mount;
4316         }
4317
4318         if (sb->s_blocksize != blocksize) {
4319                 /*
4320                  * bh must be released before kill_bdev(), otherwise
4321                  * it won't be freed and its page also. kill_bdev()
4322                  * is called by sb_set_blocksize().
4323                  */
4324                 brelse(bh);
4325                 /* Validate the filesystem blocksize */
4326                 if (!sb_set_blocksize(sb, blocksize)) {
4327                         ext4_msg(sb, KERN_ERR, "bad block size %d",
4328                                         blocksize);
4329                         bh = NULL;
4330                         goto failed_mount;
4331                 }
4332
4333                 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
4334                 offset = do_div(logical_sb_block, blocksize);
4335                 bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
4336                 if (IS_ERR(bh)) {
4337                         ext4_msg(sb, KERN_ERR,
4338                                "Can't read superblock on 2nd try");
4339                         ret = PTR_ERR(bh);
4340                         bh = NULL;
4341                         goto failed_mount;
4342                 }
4343                 es = (struct ext4_super_block *)(bh->b_data + offset);
4344                 sbi->s_es = es;
4345                 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
4346                         ext4_msg(sb, KERN_ERR,
4347                                "Magic mismatch, very weird!");
4348                         goto failed_mount;
4349                 }
4350         }
4351
4352         has_huge_files = ext4_has_feature_huge_file(sb);
4353         sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
4354                                                       has_huge_files);
4355         sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
4356
4357         sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
4358         if (ext4_has_feature_64bit(sb)) {
4359                 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
4360                     sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
4361                     !is_power_of_2(sbi->s_desc_size)) {
4362                         ext4_msg(sb, KERN_ERR,
4363                                "unsupported descriptor size %lu",
4364                                sbi->s_desc_size);
4365                         goto failed_mount;
4366                 }
4367         } else
4368                 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
4369
4370         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
4371         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
4372
4373         sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
4374         if (sbi->s_inodes_per_block == 0)
4375                 goto cantfind_ext4;
4376         if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
4377             sbi->s_inodes_per_group > blocksize * 8) {
4378                 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
4379                          sbi->s_inodes_per_group);
4380                 goto failed_mount;
4381         }
4382         sbi->s_itb_per_group = sbi->s_inodes_per_group /
4383                                         sbi->s_inodes_per_block;
4384         sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
4385         sbi->s_sbh = bh;
4386         sbi->s_mount_state = le16_to_cpu(es->s_state);
4387         sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
4388         sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
4389
4390         for (i = 0; i < 4; i++)
4391                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
4392         sbi->s_def_hash_version = es->s_def_hash_version;
4393         if (ext4_has_feature_dir_index(sb)) {
4394                 i = le32_to_cpu(es->s_flags);
4395                 if (i & EXT2_FLAGS_UNSIGNED_HASH)
4396                         sbi->s_hash_unsigned = 3;
4397                 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
4398 #ifdef __CHAR_UNSIGNED__
4399                         if (!sb_rdonly(sb))
4400                                 es->s_flags |=
4401                                         cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
4402                         sbi->s_hash_unsigned = 3;
4403 #else
4404                         if (!sb_rdonly(sb))
4405                                 es->s_flags |=
4406                                         cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
4407 #endif
4408                 }
4409         }
4410
4411         /* Handle clustersize */
4412         clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
4413         if (ext4_has_feature_bigalloc(sb)) {
4414                 if (clustersize < blocksize) {
4415                         ext4_msg(sb, KERN_ERR,
4416                                  "cluster size (%d) smaller than "
4417                                  "block size (%d)", clustersize, blocksize);
4418                         goto failed_mount;
4419                 }
4420                 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4421                         le32_to_cpu(es->s_log_block_size);
4422                 sbi->s_clusters_per_group =
4423                         le32_to_cpu(es->s_clusters_per_group);
4424                 if (sbi->s_clusters_per_group > blocksize * 8) {
4425                         ext4_msg(sb, KERN_ERR,
4426                                  "#clusters per group too big: %lu",
4427                                  sbi->s_clusters_per_group);
4428                         goto failed_mount;
4429                 }
4430                 if (sbi->s_blocks_per_group !=
4431                     (sbi->s_clusters_per_group * (clustersize / blocksize))) {
4432                         ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4433                                  "clusters per group (%lu) inconsistent",
4434                                  sbi->s_blocks_per_group,
4435                                  sbi->s_clusters_per_group);
4436                         goto failed_mount;
4437                 }
4438         } else {
4439                 if (clustersize != blocksize) {
4440                         ext4_msg(sb, KERN_ERR,
4441                                  "fragment/cluster size (%d) != "
4442                                  "block size (%d)", clustersize, blocksize);
4443                         goto failed_mount;
4444                 }
4445                 if (sbi->s_blocks_per_group > blocksize * 8) {
4446                         ext4_msg(sb, KERN_ERR,
4447                                  "#blocks per group too big: %lu",
4448                                  sbi->s_blocks_per_group);
4449                         goto failed_mount;
4450                 }
4451                 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4452                 sbi->s_cluster_bits = 0;
4453         }
4454         sbi->s_cluster_ratio = clustersize / blocksize;
4455
4456         /* Do we have standard group size of clustersize * 8 blocks ? */
4457         if (sbi->s_blocks_per_group == clustersize << 3)
4458                 set_opt2(sb, STD_GROUP_SIZE);
4459
4460         /*
4461          * Test whether we have more sectors than will fit in sector_t,
4462          * and whether the max offset is addressable by the page cache.
4463          */
4464         err = generic_check_addressable(sb->s_blocksize_bits,
4465                                         ext4_blocks_count(es));
4466         if (err) {
4467                 ext4_msg(sb, KERN_ERR, "filesystem"
4468                          " too large to mount safely on this system");
4469                 goto failed_mount;
4470         }
4471
4472         if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4473                 goto cantfind_ext4;
4474
4475         /* check blocks count against device size */
4476         blocks_count = sb_bdev_nr_blocks(sb);
4477         if (blocks_count && ext4_blocks_count(es) > blocks_count) {
4478                 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4479                        "exceeds size of device (%llu blocks)",
4480                        ext4_blocks_count(es), blocks_count);
4481                 goto failed_mount;
4482         }
4483
4484         /*
4485          * It makes no sense for the first data block to be beyond the end
4486          * of the filesystem.
4487          */
4488         if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
4489                 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4490                          "block %u is beyond end of filesystem (%llu)",
4491                          le32_to_cpu(es->s_first_data_block),
4492                          ext4_blocks_count(es));
4493                 goto failed_mount;
4494         }
4495         if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4496             (sbi->s_cluster_ratio == 1)) {
4497                 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4498                          "block is 0 with a 1k block and cluster size");
4499                 goto failed_mount;
4500         }
4501
4502         blocks_count = (ext4_blocks_count(es) -
4503                         le32_to_cpu(es->s_first_data_block) +
4504                         EXT4_BLOCKS_PER_GROUP(sb) - 1);
4505         do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4506         if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
4507                 ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
4508                        "(block count %llu, first data block %u, "
4509                        "blocks per group %lu)", blocks_count,
4510                        ext4_blocks_count(es),
4511                        le32_to_cpu(es->s_first_data_block),
4512                        EXT4_BLOCKS_PER_GROUP(sb));
4513                 goto failed_mount;
4514         }
4515         sbi->s_groups_count = blocks_count;
4516         sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4517                         (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
4518         if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4519             le32_to_cpu(es->s_inodes_count)) {
4520                 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4521                          le32_to_cpu(es->s_inodes_count),
4522                          ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4523                 ret = -EINVAL;
4524                 goto failed_mount;
4525         }
4526         db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4527                    EXT4_DESC_PER_BLOCK(sb);
4528         if (ext4_has_feature_meta_bg(sb)) {
4529                 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
4530                         ext4_msg(sb, KERN_WARNING,
4531                                  "first meta block group too large: %u "
4532                                  "(group descriptor block count %u)",
4533                                  le32_to_cpu(es->s_first_meta_bg), db_count);
4534                         goto failed_mount;
4535                 }
4536         }
4537         rcu_assign_pointer(sbi->s_group_desc,
4538                            kvmalloc_array(db_count,
4539                                           sizeof(struct buffer_head *),
4540                                           GFP_KERNEL));
4541         if (sbi->s_group_desc == NULL) {
4542                 ext4_msg(sb, KERN_ERR, "not enough memory");
4543                 ret = -ENOMEM;
4544                 goto failed_mount;
4545         }
4546
4547         bgl_lock_init(sbi->s_blockgroup_lock);
4548
4549         /* Pre-read the descriptors into the buffer cache */
4550         for (i = 0; i < db_count; i++) {
4551                 block = descriptor_loc(sb, logical_sb_block, i);
4552                 ext4_sb_breadahead_unmovable(sb, block);
4553         }
4554
4555         for (i = 0; i < db_count; i++) {
4556                 struct buffer_head *bh;
4557
4558                 block = descriptor_loc(sb, logical_sb_block, i);
4559                 bh = ext4_sb_bread_unmovable(sb, block);
4560                 if (IS_ERR(bh)) {
4561                         ext4_msg(sb, KERN_ERR,
4562                                "can't read group descriptor %d", i);
4563                         db_count = i;
4564                         ret = PTR_ERR(bh);
4565                         goto failed_mount2;
4566                 }
4567                 rcu_read_lock();
4568                 rcu_dereference(sbi->s_group_desc)[i] = bh;
4569                 rcu_read_unlock();
4570         }
4571         sbi->s_gdb_count = db_count;
4572         if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
4573                 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
4574                 ret = -EFSCORRUPTED;
4575                 goto failed_mount2;
4576         }
4577
4578         timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
4579         spin_lock_init(&sbi->s_error_lock);
4580         INIT_WORK(&sbi->s_error_work, flush_stashed_error_work);
4581
4582         /* Register extent status tree shrinker */
4583         if (ext4_es_register_shrinker(sbi))
4584                 goto failed_mount3;
4585
4586         sbi->s_stripe = ext4_get_stripe_size(sbi);
4587         sbi->s_extent_max_zeroout_kb = 32;
4588
4589         /*
4590          * set up enough so that it can read an inode
4591          */
4592         sb->s_op = &ext4_sops;
4593         sb->s_export_op = &ext4_export_ops;
4594         sb->s_xattr = ext4_xattr_handlers;
4595 #ifdef CONFIG_FS_ENCRYPTION
4596         sb->s_cop = &ext4_cryptops;
4597 #endif
4598 #ifdef CONFIG_FS_VERITY
4599         sb->s_vop = &ext4_verityops;
4600 #endif
4601 #ifdef CONFIG_QUOTA
4602         sb->dq_op = &ext4_quota_operations;
4603         if (ext4_has_feature_quota(sb))
4604                 sb->s_qcop = &dquot_quotactl_sysfile_ops;
4605         else
4606                 sb->s_qcop = &ext4_qctl_operations;
4607         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
4608 #endif
4609         memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
4610
4611         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
4612         mutex_init(&sbi->s_orphan_lock);
4613
4614         /* Initialize fast commit stuff */
4615         atomic_set(&sbi->s_fc_subtid, 0);
4616         atomic_set(&sbi->s_fc_ineligible_updates, 0);
4617         INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_MAIN]);
4618         INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_STAGING]);
4619         INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_MAIN]);
4620         INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_STAGING]);
4621         sbi->s_fc_bytes = 0;
4622         ext4_clear_mount_flag(sb, EXT4_MF_FC_INELIGIBLE);
4623         ext4_clear_mount_flag(sb, EXT4_MF_FC_COMMITTING);
4624         spin_lock_init(&sbi->s_fc_lock);
4625         memset(&sbi->s_fc_stats, 0, sizeof(sbi->s_fc_stats));
4626         sbi->s_fc_replay_state.fc_regions = NULL;
4627         sbi->s_fc_replay_state.fc_regions_size = 0;
4628         sbi->s_fc_replay_state.fc_regions_used = 0;
4629         sbi->s_fc_replay_state.fc_regions_valid = 0;
4630         sbi->s_fc_replay_state.fc_modified_inodes = NULL;
4631         sbi->s_fc_replay_state.fc_modified_inodes_size = 0;
4632         sbi->s_fc_replay_state.fc_modified_inodes_used = 0;
4633
4634         sb->s_root = NULL;
4635
4636         needs_recovery = (es->s_last_orphan != 0 ||
4637                           ext4_has_feature_orphan_present(sb) ||
4638                           ext4_has_feature_journal_needs_recovery(sb));
4639
4640         if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
4641                 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
4642                         goto failed_mount3a;
4643
4644         /*
4645          * The first inode we look at is the journal inode.  Don't try
4646          * root first: it may be modified in the journal!
4647          */
4648         if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4649                 err = ext4_load_journal(sb, es, parsed_opts.journal_devnum);
4650                 if (err)
4651                         goto failed_mount3a;
4652         } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
4653                    ext4_has_feature_journal_needs_recovery(sb)) {
4654                 ext4_msg(sb, KERN_ERR, "required journal recovery "
4655                        "suppressed and not mounted read-only");
4656                 goto failed_mount_wq;
4657         } else {
4658                 /* Nojournal mode, all journal mount options are illegal */
4659                 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4660                         ext4_msg(sb, KERN_ERR, "can't mount with "
4661                                  "journal_checksum, fs mounted w/o journal");
4662                         goto failed_mount_wq;
4663                 }
4664                 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4665                         ext4_msg(sb, KERN_ERR, "can't mount with "
4666                                  "journal_async_commit, fs mounted w/o journal");
4667                         goto failed_mount_wq;
4668                 }
4669                 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4670                         ext4_msg(sb, KERN_ERR, "can't mount with "
4671                                  "commit=%lu, fs mounted w/o journal",
4672                                  sbi->s_commit_interval / HZ);
4673                         goto failed_mount_wq;
4674                 }
4675                 if (EXT4_MOUNT_DATA_FLAGS &
4676                     (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4677                         ext4_msg(sb, KERN_ERR, "can't mount with "
4678                                  "data=, fs mounted w/o journal");
4679                         goto failed_mount_wq;
4680                 }
4681                 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
4682                 clear_opt(sb, JOURNAL_CHECKSUM);
4683                 clear_opt(sb, DATA_FLAGS);
4684                 clear_opt2(sb, JOURNAL_FAST_COMMIT);
4685                 sbi->s_journal = NULL;
4686                 needs_recovery = 0;
4687                 goto no_journal;
4688         }
4689
4690         if (ext4_has_feature_64bit(sb) &&
4691             !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4692                                        JBD2_FEATURE_INCOMPAT_64BIT)) {
4693                 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4694                 goto failed_mount_wq;
4695         }
4696
4697         if (!set_journal_csum_feature_set(sb)) {
4698                 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4699                          "feature set");
4700                 goto failed_mount_wq;
4701         }
4702
4703         if (test_opt2(sb, JOURNAL_FAST_COMMIT) &&
4704                 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4705                                           JBD2_FEATURE_INCOMPAT_FAST_COMMIT)) {
4706                 ext4_msg(sb, KERN_ERR,
4707                         "Failed to set fast commit journal feature");
4708                 goto failed_mount_wq;
4709         }
4710
4711         /* We have now updated the journal if required, so we can
4712          * validate the data journaling mode. */
4713         switch (test_opt(sb, DATA_FLAGS)) {
4714         case 0:
4715                 /* No mode set, assume a default based on the journal
4716                  * capabilities: ORDERED_DATA if the journal can
4717                  * cope, else JOURNAL_DATA
4718                  */
4719                 if (jbd2_journal_check_available_features
4720                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4721                         set_opt(sb, ORDERED_DATA);
4722                         sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4723                 } else {
4724                         set_opt(sb, JOURNAL_DATA);
4725                         sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4726                 }
4727                 break;
4728
4729         case EXT4_MOUNT_ORDERED_DATA:
4730         case EXT4_MOUNT_WRITEBACK_DATA:
4731                 if (!jbd2_journal_check_available_features
4732                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4733                         ext4_msg(sb, KERN_ERR, "Journal does not support "
4734                                "requested data journaling mode");
4735                         goto failed_mount_wq;
4736                 }
4737                 break;
4738         default:
4739                 break;
4740         }
4741
4742         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4743             test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4744                 ext4_msg(sb, KERN_ERR, "can't mount with "
4745                         "journal_async_commit in data=ordered mode");
4746                 goto failed_mount_wq;
4747         }
4748
4749         set_task_ioprio(sbi->s_journal->j_task, parsed_opts.journal_ioprio);
4750
4751         sbi->s_journal->j_submit_inode_data_buffers =
4752                 ext4_journal_submit_inode_data_buffers;
4753         sbi->s_journal->j_finish_inode_data_buffers =
4754                 ext4_journal_finish_inode_data_buffers;
4755
4756 no_journal:
4757         if (!test_opt(sb, NO_MBCACHE)) {
4758                 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4759                 if (!sbi->s_ea_block_cache) {
4760                         ext4_msg(sb, KERN_ERR,
4761                                  "Failed to create ea_block_cache");
4762                         goto failed_mount_wq;
4763                 }
4764
4765                 if (ext4_has_feature_ea_inode(sb)) {
4766                         sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4767                         if (!sbi->s_ea_inode_cache) {
4768                                 ext4_msg(sb, KERN_ERR,
4769                                          "Failed to create ea_inode_cache");
4770                                 goto failed_mount_wq;
4771                         }
4772                 }
4773         }
4774
4775         if (ext4_has_feature_verity(sb) && blocksize != PAGE_SIZE) {
4776                 ext4_msg(sb, KERN_ERR, "Unsupported blocksize for fs-verity");
4777                 goto failed_mount_wq;
4778         }
4779
4780         if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
4781             !ext4_has_feature_encrypt(sb)) {
4782                 ext4_set_feature_encrypt(sb);
4783                 ext4_commit_super(sb);
4784         }
4785
4786         /*
4787          * Get the # of file system overhead blocks from the
4788          * superblock if present.
4789          */
4790         if (es->s_overhead_clusters)
4791                 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4792         else {
4793                 err = ext4_calculate_overhead(sb);
4794                 if (err)
4795                         goto failed_mount_wq;
4796         }
4797
4798         /*
4799          * The maximum number of concurrent works can be high and
4800          * concurrency isn't really necessary.  Limit it to 1.
4801          */
4802         EXT4_SB(sb)->rsv_conversion_wq =
4803                 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4804         if (!EXT4_SB(sb)->rsv_conversion_wq) {
4805                 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
4806                 ret = -ENOMEM;
4807                 goto failed_mount4;
4808         }
4809
4810         /*
4811          * The jbd2_journal_load will have done any necessary log recovery,
4812          * so we can safely mount the rest of the filesystem now.
4813          */
4814
4815         root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
4816         if (IS_ERR(root)) {
4817                 ext4_msg(sb, KERN_ERR, "get root inode failed");
4818                 ret = PTR_ERR(root);
4819                 root = NULL;
4820                 goto failed_mount4;
4821         }
4822         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4823                 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
4824                 iput(root);
4825                 goto failed_mount4;
4826         }
4827
4828         sb->s_root = d_make_root(root);
4829         if (!sb->s_root) {
4830                 ext4_msg(sb, KERN_ERR, "get root dentry failed");
4831                 ret = -ENOMEM;
4832                 goto failed_mount4;
4833         }
4834
4835         ret = ext4_setup_super(sb, es, sb_rdonly(sb));
4836         if (ret == -EROFS) {
4837                 sb->s_flags |= SB_RDONLY;
4838                 ret = 0;
4839         } else if (ret)
4840                 goto failed_mount4a;
4841
4842         ext4_set_resv_clusters(sb);
4843
4844         if (test_opt(sb, BLOCK_VALIDITY)) {
4845                 err = ext4_setup_system_zone(sb);
4846                 if (err) {
4847                         ext4_msg(sb, KERN_ERR, "failed to initialize system "
4848                                  "zone (%d)", err);
4849                         goto failed_mount4a;
4850                 }
4851         }
4852         ext4_fc_replay_cleanup(sb);
4853
4854         ext4_ext_init(sb);
4855
4856         /*
4857          * Enable optimize_scan if number of groups is > threshold. This can be
4858          * turned off by passing "mb_optimize_scan=0". This can also be
4859          * turned on forcefully by passing "mb_optimize_scan=1".
4860          */
4861         if (parsed_opts.mb_optimize_scan == 1)
4862                 set_opt2(sb, MB_OPTIMIZE_SCAN);
4863         else if (parsed_opts.mb_optimize_scan == 0)
4864                 clear_opt2(sb, MB_OPTIMIZE_SCAN);
4865         else if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD)
4866                 set_opt2(sb, MB_OPTIMIZE_SCAN);
4867
4868         err = ext4_mb_init(sb);
4869         if (err) {
4870                 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4871                          err);
4872                 goto failed_mount5;
4873         }
4874
4875         /*
4876          * We can only set up the journal commit callback once
4877          * mballoc is initialized
4878          */
4879         if (sbi->s_journal)
4880                 sbi->s_journal->j_commit_callback =
4881                         ext4_journal_commit_callback;
4882
4883         block = ext4_count_free_clusters(sb);
4884         ext4_free_blocks_count_set(sbi->s_es,
4885                                    EXT4_C2B(sbi, block));
4886         err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4887                                   GFP_KERNEL);
4888         if (!err) {
4889                 unsigned long freei = ext4_count_free_inodes(sb);
4890                 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4891                 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4892                                           GFP_KERNEL);
4893         }
4894         /*
4895          * Update the checksum after updating free space/inode
4896          * counters.  Otherwise the superblock can have an incorrect
4897          * checksum in the buffer cache until it is written out and
4898          * e2fsprogs programs trying to open a file system immediately
4899          * after it is mounted can fail.
4900          */
4901         ext4_superblock_csum_set(sb);
4902         if (!err)
4903                 err = percpu_counter_init(&sbi->s_dirs_counter,
4904                                           ext4_count_dirs(sb), GFP_KERNEL);
4905         if (!err)
4906                 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4907                                           GFP_KERNEL);
4908         if (!err)
4909                 err = percpu_counter_init(&sbi->s_sra_exceeded_retry_limit, 0,
4910                                           GFP_KERNEL);
4911         if (!err)
4912                 err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
4913
4914         if (err) {
4915                 ext4_msg(sb, KERN_ERR, "insufficient memory");
4916                 goto failed_mount6;
4917         }
4918
4919         if (ext4_has_feature_flex_bg(sb))
4920                 if (!ext4_fill_flex_info(sb)) {
4921                         ext4_msg(sb, KERN_ERR,
4922                                "unable to initialize "
4923                                "flex_bg meta info!");
4924                         ret = -ENOMEM;
4925                         goto failed_mount6;
4926                 }
4927
4928         err = ext4_register_li_request(sb, first_not_zeroed);
4929         if (err)
4930                 goto failed_mount6;
4931
4932         err = ext4_register_sysfs(sb);
4933         if (err)
4934                 goto failed_mount7;
4935
4936         err = ext4_init_orphan_info(sb);
4937         if (err)
4938                 goto failed_mount8;
4939 #ifdef CONFIG_QUOTA
4940         /* Enable quota usage during mount. */
4941         if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
4942                 err = ext4_enable_quotas(sb);
4943                 if (err)
4944                         goto failed_mount9;
4945         }
4946 #endif  /* CONFIG_QUOTA */
4947
4948         /*
4949          * Save the original bdev mapping's wb_err value which could be
4950          * used to detect the metadata async write error.
4951          */
4952         spin_lock_init(&sbi->s_bdev_wb_lock);
4953         errseq_check_and_advance(&sb->s_bdev->bd_inode->i_mapping->wb_err,
4954                                  &sbi->s_bdev_wb_err);
4955         sb->s_bdev->bd_super = sb;
4956         EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4957         ext4_orphan_cleanup(sb, es);
4958         EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4959         if (needs_recovery) {
4960                 ext4_msg(sb, KERN_INFO, "recovery complete");
4961                 err = ext4_mark_recovery_complete(sb, es);
4962                 if (err)
4963                         goto failed_mount9;
4964         }
4965         if (EXT4_SB(sb)->s_journal) {
4966                 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4967                         descr = " journalled data mode";
4968                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4969                         descr = " ordered data mode";
4970                 else
4971                         descr = " writeback data mode";
4972         } else
4973                 descr = "out journal";
4974
4975         if (test_opt(sb, DISCARD)) {
4976                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4977                 if (!blk_queue_discard(q))
4978                         ext4_msg(sb, KERN_WARNING,
4979                                  "mounting with \"discard\" option, but "
4980                                  "the device does not support discard");
4981         }
4982
4983         if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4984                 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4985                          "Opts: %.*s%s%s. Quota mode: %s.", descr,
4986                          (int) sizeof(sbi->s_es->s_mount_opts),
4987                          sbi->s_es->s_mount_opts,
4988                          *sbi->s_es->s_mount_opts ? "; " : "", orig_data,
4989                          ext4_quota_mode(sb));
4990
4991         if (es->s_error_count)
4992                 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4993
4994         /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4995         ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4996         ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4997         ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4998         atomic_set(&sbi->s_warning_count, 0);
4999         atomic_set(&sbi->s_msg_count, 0);
5000
5001         kfree(orig_data);
5002         return 0;
5003
5004 cantfind_ext4:
5005         if (!silent)
5006                 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
5007         goto failed_mount;
5008
5009 failed_mount9:
5010         ext4_release_orphan_info(sb);
5011 failed_mount8:
5012         ext4_unregister_sysfs(sb);
5013         kobject_put(&sbi->s_kobj);
5014 failed_mount7:
5015         ext4_unregister_li_request(sb);
5016 failed_mount6:
5017         ext4_mb_release(sb);
5018         rcu_read_lock();
5019         flex_groups = rcu_dereference(sbi->s_flex_groups);
5020         if (flex_groups) {
5021                 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
5022                         kvfree(flex_groups[i]);
5023                 kvfree(flex_groups);
5024         }
5025         rcu_read_unlock();
5026         percpu_counter_destroy(&sbi->s_freeclusters_counter);
5027         percpu_counter_destroy(&sbi->s_freeinodes_counter);
5028         percpu_counter_destroy(&sbi->s_dirs_counter);
5029         percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
5030         percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit);
5031         percpu_free_rwsem(&sbi->s_writepages_rwsem);
5032 failed_mount5:
5033         ext4_ext_release(sb);
5034         ext4_release_system_zone(sb);
5035 failed_mount4a:
5036         dput(sb->s_root);
5037         sb->s_root = NULL;
5038 failed_mount4:
5039         ext4_msg(sb, KERN_ERR, "mount failed");
5040         if (EXT4_SB(sb)->rsv_conversion_wq)
5041                 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
5042 failed_mount_wq:
5043         ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
5044         sbi->s_ea_inode_cache = NULL;
5045
5046         ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
5047         sbi->s_ea_block_cache = NULL;
5048
5049         if (sbi->s_journal) {
5050                 /* flush s_error_work before journal destroy. */
5051                 flush_work(&sbi->s_error_work);
5052                 jbd2_journal_destroy(sbi->s_journal);
5053                 sbi->s_journal = NULL;
5054         }
5055 failed_mount3a:
5056         ext4_es_unregister_shrinker(sbi);
5057 failed_mount3:
5058         /* flush s_error_work before sbi destroy */
5059         flush_work(&sbi->s_error_work);
5060         del_timer_sync(&sbi->s_err_report);
5061         ext4_stop_mmpd(sbi);
5062 failed_mount2:
5063         rcu_read_lock();
5064         group_desc = rcu_dereference(sbi->s_group_desc);
5065         for (i = 0; i < db_count; i++)
5066                 brelse(group_desc[i]);
5067         kvfree(group_desc);
5068         rcu_read_unlock();
5069 failed_mount:
5070         if (sbi->s_chksum_driver)
5071                 crypto_free_shash(sbi->s_chksum_driver);
5072
5073 #ifdef CONFIG_UNICODE
5074         utf8_unload(sb->s_encoding);
5075 #endif
5076
5077 #ifdef CONFIG_QUOTA
5078         for (i = 0; i < EXT4_MAXQUOTAS; i++)
5079                 kfree(get_qf_name(sb, sbi, i));
5080 #endif
5081         fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
5082         /* ext4_blkdev_remove() calls kill_bdev(), release bh before it. */
5083         brelse(bh);
5084         ext4_blkdev_remove(sbi);
5085 out_fail:
5086         sb->s_fs_info = NULL;
5087         kfree(sbi->s_blockgroup_lock);
5088 out_free_base:
5089         kfree(sbi);
5090         kfree(orig_data);
5091         fs_put_dax(dax_dev);
5092         return err ? err : ret;
5093 }
5094
5095 /*
5096  * Setup any per-fs journal parameters now.  We'll do this both on
5097  * initial mount, once the journal has been initialised but before we've
5098  * done any recovery; and again on any subsequent remount.
5099  */
5100 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
5101 {
5102         struct ext4_sb_info *sbi = EXT4_SB(sb);
5103
5104         journal->j_commit_interval = sbi->s_commit_interval;
5105         journal->j_min_batch_time = sbi->s_min_batch_time;
5106         journal->j_max_batch_time = sbi->s_max_batch_time;
5107         ext4_fc_init(sb, journal);
5108
5109         write_lock(&journal->j_state_lock);
5110         if (test_opt(sb, BARRIER))
5111                 journal->j_flags |= JBD2_BARRIER;
5112         else
5113                 journal->j_flags &= ~JBD2_BARRIER;
5114         if (test_opt(sb, DATA_ERR_ABORT))
5115                 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
5116         else
5117                 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
5118         write_unlock(&journal->j_state_lock);
5119 }
5120
5121 static struct inode *ext4_get_journal_inode(struct super_block *sb,
5122                                              unsigned int journal_inum)
5123 {
5124         struct inode *journal_inode;
5125
5126         /*
5127          * Test for the existence of a valid inode on disk.  Bad things
5128          * happen if we iget() an unused inode, as the subsequent iput()
5129          * will try to delete it.
5130          */
5131         journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
5132         if (IS_ERR(journal_inode)) {
5133                 ext4_msg(sb, KERN_ERR, "no journal found");
5134                 return NULL;
5135         }
5136         if (!journal_inode->i_nlink) {
5137                 make_bad_inode(journal_inode);
5138                 iput(journal_inode);
5139                 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
5140                 return NULL;
5141         }
5142
5143         jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
5144                   journal_inode, journal_inode->i_size);
5145         if (!S_ISREG(journal_inode->i_mode)) {
5146                 ext4_msg(sb, KERN_ERR, "invalid journal inode");
5147                 iput(journal_inode);
5148                 return NULL;
5149         }
5150         return journal_inode;
5151 }
5152
5153 static journal_t *ext4_get_journal(struct super_block *sb,
5154                                    unsigned int journal_inum)
5155 {
5156         struct inode *journal_inode;
5157         journal_t *journal;
5158
5159         if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5160                 return NULL;
5161
5162         journal_inode = ext4_get_journal_inode(sb, journal_inum);
5163         if (!journal_inode)
5164                 return NULL;
5165
5166         journal = jbd2_journal_init_inode(journal_inode);
5167         if (!journal) {
5168                 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
5169                 iput(journal_inode);
5170                 return NULL;
5171         }
5172         journal->j_private = sb;
5173         ext4_init_journal_params(sb, journal);
5174         return journal;
5175 }
5176
5177 static journal_t *ext4_get_dev_journal(struct super_block *sb,
5178                                        dev_t j_dev)
5179 {
5180         struct buffer_head *bh;
5181         journal_t *journal;
5182         ext4_fsblk_t start;
5183         ext4_fsblk_t len;
5184         int hblock, blocksize;
5185         ext4_fsblk_t sb_block;
5186         unsigned long offset;
5187         struct ext4_super_block *es;
5188         struct block_device *bdev;
5189
5190         if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5191                 return NULL;
5192
5193         bdev = ext4_blkdev_get(j_dev, sb);
5194         if (bdev == NULL)
5195                 return NULL;
5196
5197         blocksize = sb->s_blocksize;
5198         hblock = bdev_logical_block_size(bdev);
5199         if (blocksize < hblock) {
5200                 ext4_msg(sb, KERN_ERR,
5201                         "blocksize too small for journal device");
5202                 goto out_bdev;
5203         }
5204
5205         sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
5206         offset = EXT4_MIN_BLOCK_SIZE % blocksize;
5207         set_blocksize(bdev, blocksize);
5208         if (!(bh = __bread(bdev, sb_block, blocksize))) {
5209                 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
5210                        "external journal");
5211                 goto out_bdev;
5212         }
5213
5214         es = (struct ext4_super_block *) (bh->b_data + offset);
5215         if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
5216             !(le32_to_cpu(es->s_feature_incompat) &
5217               EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
5218                 ext4_msg(sb, KERN_ERR, "external journal has "
5219                                         "bad superblock");
5220                 brelse(bh);
5221                 goto out_bdev;
5222         }
5223
5224         if ((le32_to_cpu(es->s_feature_ro_compat) &
5225              EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
5226             es->s_checksum != ext4_superblock_csum(sb, es)) {
5227                 ext4_msg(sb, KERN_ERR, "external journal has "
5228                                        "corrupt superblock");
5229                 brelse(bh);
5230                 goto out_bdev;
5231         }
5232
5233         if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
5234                 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
5235                 brelse(bh);
5236                 goto out_bdev;
5237         }
5238
5239         len = ext4_blocks_count(es);
5240         start = sb_block + 1;
5241         brelse(bh);     /* we're done with the superblock */
5242
5243         journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
5244                                         start, len, blocksize);
5245         if (!journal) {
5246                 ext4_msg(sb, KERN_ERR, "failed to create device journal");
5247                 goto out_bdev;
5248         }
5249         journal->j_private = sb;
5250         if (ext4_read_bh_lock(journal->j_sb_buffer, REQ_META | REQ_PRIO, true)) {
5251                 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
5252                 goto out_journal;
5253         }
5254         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
5255                 ext4_msg(sb, KERN_ERR, "External journal has more than one "
5256                                         "user (unsupported) - %d",
5257                         be32_to_cpu(journal->j_superblock->s_nr_users));
5258                 goto out_journal;
5259         }
5260         EXT4_SB(sb)->s_journal_bdev = bdev;
5261         ext4_init_journal_params(sb, journal);
5262         return journal;
5263
5264 out_journal:
5265         jbd2_journal_destroy(journal);
5266 out_bdev:
5267         ext4_blkdev_put(bdev);
5268         return NULL;
5269 }
5270
5271 static int ext4_load_journal(struct super_block *sb,
5272                              struct ext4_super_block *es,
5273                              unsigned long journal_devnum)
5274 {
5275         journal_t *journal;
5276         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
5277         dev_t journal_dev;
5278         int err = 0;
5279         int really_read_only;
5280         int journal_dev_ro;
5281
5282         if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5283                 return -EFSCORRUPTED;
5284
5285         if (journal_devnum &&
5286             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
5287                 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
5288                         "numbers have changed");
5289                 journal_dev = new_decode_dev(journal_devnum);
5290         } else
5291                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
5292
5293         if (journal_inum && journal_dev) {
5294                 ext4_msg(sb, KERN_ERR,
5295                          "filesystem has both journal inode and journal device!");
5296                 return -EINVAL;
5297         }
5298
5299         if (journal_inum) {
5300                 journal = ext4_get_journal(sb, journal_inum);
5301                 if (!journal)
5302                         return -EINVAL;
5303         } else {
5304                 journal = ext4_get_dev_journal(sb, journal_dev);
5305                 if (!journal)
5306                         return -EINVAL;
5307         }
5308
5309         journal_dev_ro = bdev_read_only(journal->j_dev);
5310         really_read_only = bdev_read_only(sb->s_bdev) | journal_dev_ro;
5311
5312         if (journal_dev_ro && !sb_rdonly(sb)) {
5313                 ext4_msg(sb, KERN_ERR,
5314                          "journal device read-only, try mounting with '-o ro'");
5315                 err = -EROFS;
5316                 goto err_out;
5317         }
5318
5319         /*
5320          * Are we loading a blank journal or performing recovery after a
5321          * crash?  For recovery, we need to check in advance whether we
5322          * can get read-write access to the device.
5323          */
5324         if (ext4_has_feature_journal_needs_recovery(sb)) {
5325                 if (sb_rdonly(sb)) {
5326                         ext4_msg(sb, KERN_INFO, "INFO: recovery "
5327                                         "required on readonly filesystem");
5328                         if (really_read_only) {
5329                                 ext4_msg(sb, KERN_ERR, "write access "
5330                                         "unavailable, cannot proceed "
5331                                         "(try mounting with noload)");
5332                                 err = -EROFS;
5333                                 goto err_out;
5334                         }
5335                         ext4_msg(sb, KERN_INFO, "write access will "
5336                                "be enabled during recovery");
5337                 }
5338         }
5339
5340         if (!(journal->j_flags & JBD2_BARRIER))
5341                 ext4_msg(sb, KERN_INFO, "barriers disabled");
5342
5343         if (!ext4_has_feature_journal_needs_recovery(sb))
5344                 err = jbd2_journal_wipe(journal, !really_read_only);
5345         if (!err) {
5346                 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
5347                 if (save)
5348                         memcpy(save, ((char *) es) +
5349                                EXT4_S_ERR_START, EXT4_S_ERR_LEN);
5350                 err = jbd2_journal_load(journal);
5351                 if (save)
5352                         memcpy(((char *) es) + EXT4_S_ERR_START,
5353                                save, EXT4_S_ERR_LEN);
5354                 kfree(save);
5355         }
5356
5357         if (err) {
5358                 ext4_msg(sb, KERN_ERR, "error loading journal");
5359                 goto err_out;
5360         }
5361
5362         EXT4_SB(sb)->s_journal = journal;
5363         err = ext4_clear_journal_err(sb, es);
5364         if (err) {
5365                 EXT4_SB(sb)->s_journal = NULL;
5366                 jbd2_journal_destroy(journal);
5367                 return err;
5368         }
5369
5370         if (!really_read_only && journal_devnum &&
5371             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
5372                 es->s_journal_dev = cpu_to_le32(journal_devnum);
5373
5374                 /* Make sure we flush the recovery flag to disk. */
5375                 ext4_commit_super(sb);
5376         }
5377
5378         return 0;
5379
5380 err_out:
5381         jbd2_journal_destroy(journal);
5382         return err;
5383 }
5384
5385 /* Copy state of EXT4_SB(sb) into buffer for on-disk superblock */
5386 static void ext4_update_super(struct super_block *sb)
5387 {
5388         struct ext4_sb_info *sbi = EXT4_SB(sb);
5389         struct ext4_super_block *es = sbi->s_es;
5390         struct buffer_head *sbh = sbi->s_sbh;
5391
5392         lock_buffer(sbh);
5393         /*
5394          * If the file system is mounted read-only, don't update the
5395          * superblock write time.  This avoids updating the superblock
5396          * write time when we are mounting the root file system
5397          * read/only but we need to replay the journal; at that point,
5398          * for people who are east of GMT and who make their clock
5399          * tick in localtime for Windows bug-for-bug compatibility,
5400          * the clock is set in the future, and this will cause e2fsck
5401          * to complain and force a full file system check.
5402          */
5403         if (!(sb->s_flags & SB_RDONLY))
5404                 ext4_update_tstamp(es, s_wtime);
5405         es->s_kbytes_written =
5406                 cpu_to_le64(sbi->s_kbytes_written +
5407                     ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
5408                       sbi->s_sectors_written_start) >> 1));
5409         if (percpu_counter_initialized(&sbi->s_freeclusters_counter))
5410                 ext4_free_blocks_count_set(es,
5411                         EXT4_C2B(sbi, percpu_counter_sum_positive(
5412                                 &sbi->s_freeclusters_counter)));
5413         if (percpu_counter_initialized(&sbi->s_freeinodes_counter))
5414                 es->s_free_inodes_count =
5415                         cpu_to_le32(percpu_counter_sum_positive(
5416                                 &sbi->s_freeinodes_counter));
5417         /* Copy error information to the on-disk superblock */
5418         spin_lock(&sbi->s_error_lock);
5419         if (sbi->s_add_error_count > 0) {
5420                 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
5421                 if (!es->s_first_error_time && !es->s_first_error_time_hi) {
5422                         __ext4_update_tstamp(&es->s_first_error_time,
5423                                              &es->s_first_error_time_hi,
5424                                              sbi->s_first_error_time);
5425                         strncpy(es->s_first_error_func, sbi->s_first_error_func,
5426                                 sizeof(es->s_first_error_func));
5427                         es->s_first_error_line =
5428                                 cpu_to_le32(sbi->s_first_error_line);
5429                         es->s_first_error_ino =
5430                                 cpu_to_le32(sbi->s_first_error_ino);
5431                         es->s_first_error_block =
5432                                 cpu_to_le64(sbi->s_first_error_block);
5433                         es->s_first_error_errcode =
5434                                 ext4_errno_to_code(sbi->s_first_error_code);
5435                 }
5436                 __ext4_update_tstamp(&es->s_last_error_time,
5437                                      &es->s_last_error_time_hi,
5438                                      sbi->s_last_error_time);
5439                 strncpy(es->s_last_error_func, sbi->s_last_error_func,
5440                         sizeof(es->s_last_error_func));
5441                 es->s_last_error_line = cpu_to_le32(sbi->s_last_error_line);
5442                 es->s_last_error_ino = cpu_to_le32(sbi->s_last_error_ino);
5443                 es->s_last_error_block = cpu_to_le64(sbi->s_last_error_block);
5444                 es->s_last_error_errcode =
5445                                 ext4_errno_to_code(sbi->s_last_error_code);
5446                 /*
5447                  * Start the daily error reporting function if it hasn't been
5448                  * started already
5449                  */
5450                 if (!es->s_error_count)
5451                         mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);
5452                 le32_add_cpu(&es->s_error_count, sbi->s_add_error_count);
5453                 sbi->s_add_error_count = 0;
5454         }
5455         spin_unlock(&sbi->s_error_lock);
5456
5457         ext4_superblock_csum_set(sb);
5458         unlock_buffer(sbh);
5459 }
5460
5461 static int ext4_commit_super(struct super_block *sb)
5462 {
5463         struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
5464         int error = 0;
5465
5466         if (!sbh)
5467                 return -EINVAL;
5468         if (block_device_ejected(sb))
5469                 return -ENODEV;
5470
5471         ext4_update_super(sb);
5472
5473         if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
5474                 /*
5475                  * Oh, dear.  A previous attempt to write the
5476                  * superblock failed.  This could happen because the
5477                  * USB device was yanked out.  Or it could happen to
5478                  * be a transient write error and maybe the block will
5479                  * be remapped.  Nothing we can do but to retry the
5480                  * write and hope for the best.
5481                  */
5482                 ext4_msg(sb, KERN_ERR, "previous I/O error to "
5483                        "superblock detected");
5484                 clear_buffer_write_io_error(sbh);
5485                 set_buffer_uptodate(sbh);
5486         }
5487         BUFFER_TRACE(sbh, "marking dirty");
5488         mark_buffer_dirty(sbh);
5489         error = __sync_dirty_buffer(sbh,
5490                 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
5491         if (buffer_write_io_error(sbh)) {
5492                 ext4_msg(sb, KERN_ERR, "I/O error while writing "
5493                        "superblock");
5494                 clear_buffer_write_io_error(sbh);
5495                 set_buffer_uptodate(sbh);
5496         }
5497         return error;
5498 }
5499
5500 /*
5501  * Have we just finished recovery?  If so, and if we are mounting (or
5502  * remounting) the filesystem readonly, then we will end up with a
5503  * consistent fs on disk.  Record that fact.
5504  */
5505 static int ext4_mark_recovery_complete(struct super_block *sb,
5506                                        struct ext4_super_block *es)
5507 {
5508         int err;
5509         journal_t *journal = EXT4_SB(sb)->s_journal;
5510
5511         if (!ext4_has_feature_journal(sb)) {
5512                 if (journal != NULL) {
5513                         ext4_error(sb, "Journal got removed while the fs was "
5514                                    "mounted!");
5515                         return -EFSCORRUPTED;
5516                 }
5517                 return 0;
5518         }
5519         jbd2_journal_lock_updates(journal);
5520         err = jbd2_journal_flush(journal, 0);
5521         if (err < 0)
5522                 goto out;
5523
5524         if (sb_rdonly(sb) && (ext4_has_feature_journal_needs_recovery(sb) ||
5525             ext4_has_feature_orphan_present(sb))) {
5526                 if (!ext4_orphan_file_empty(sb)) {
5527                         ext4_error(sb, "Orphan file not empty on read-only fs.");
5528                         err = -EFSCORRUPTED;
5529                         goto out;
5530                 }
5531                 ext4_clear_feature_journal_needs_recovery(sb);
5532                 ext4_clear_feature_orphan_present(sb);
5533                 ext4_commit_super(sb);
5534         }
5535 out:
5536         jbd2_journal_unlock_updates(journal);
5537         return err;
5538 }
5539
5540 /*
5541  * If we are mounting (or read-write remounting) a filesystem whose journal
5542  * has recorded an error from a previous lifetime, move that error to the
5543  * main filesystem now.
5544  */
5545 static int ext4_clear_journal_err(struct super_block *sb,
5546                                    struct ext4_super_block *es)
5547 {
5548         journal_t *journal;
5549         int j_errno;
5550         const char *errstr;
5551
5552         if (!ext4_has_feature_journal(sb)) {
5553                 ext4_error(sb, "Journal got removed while the fs was mounted!");
5554                 return -EFSCORRUPTED;
5555         }
5556
5557         journal = EXT4_SB(sb)->s_journal;
5558
5559         /*
5560          * Now check for any error status which may have been recorded in the
5561          * journal by a prior ext4_error() or ext4_abort()
5562          */
5563
5564         j_errno = jbd2_journal_errno(journal);
5565         if (j_errno) {
5566                 char nbuf[16];
5567
5568                 errstr = ext4_decode_error(sb, j_errno, nbuf);
5569                 ext4_warning(sb, "Filesystem error recorded "
5570                              "from previous mount: %s", errstr);
5571                 ext4_warning(sb, "Marking fs in need of filesystem check.");
5572
5573                 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
5574                 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
5575                 ext4_commit_super(sb);
5576
5577                 jbd2_journal_clear_err(journal);
5578                 jbd2_journal_update_sb_errno(journal);
5579         }
5580         return 0;
5581 }
5582
5583 /*
5584  * Force the running and committing transactions to commit,
5585  * and wait on the commit.
5586  */
5587 int ext4_force_commit(struct super_block *sb)
5588 {
5589         journal_t *journal;
5590
5591         if (sb_rdonly(sb))
5592                 return 0;
5593
5594         journal = EXT4_SB(sb)->s_journal;
5595         return ext4_journal_force_commit(journal);
5596 }
5597
5598 static int ext4_sync_fs(struct super_block *sb, int wait)
5599 {
5600         int ret = 0;
5601         tid_t target;
5602         bool needs_barrier = false;
5603         struct ext4_sb_info *sbi = EXT4_SB(sb);
5604
5605         if (unlikely(ext4_forced_shutdown(sbi)))
5606                 return 0;
5607
5608         trace_ext4_sync_fs(sb, wait);
5609         flush_workqueue(sbi->rsv_conversion_wq);
5610         /*
5611          * Writeback quota in non-journalled quota case - journalled quota has
5612          * no dirty dquots
5613          */
5614         dquot_writeback_dquots(sb, -1);
5615         /*
5616          * Data writeback is possible w/o journal transaction, so barrier must
5617          * being sent at the end of the function. But we can skip it if
5618          * transaction_commit will do it for us.
5619          */
5620         if (sbi->s_journal) {
5621                 target = jbd2_get_latest_transaction(sbi->s_journal);
5622                 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
5623                     !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
5624                         needs_barrier = true;
5625
5626                 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
5627                         if (wait)
5628                                 ret = jbd2_log_wait_commit(sbi->s_journal,
5629                                                            target);
5630                 }
5631         } else if (wait && test_opt(sb, BARRIER))
5632                 needs_barrier = true;
5633         if (needs_barrier) {
5634                 int err;
5635                 err = blkdev_issue_flush(sb->s_bdev);
5636                 if (!ret)
5637                         ret = err;
5638         }
5639
5640         return ret;
5641 }
5642
5643 /*
5644  * LVM calls this function before a (read-only) snapshot is created.  This
5645  * gives us a chance to flush the journal completely and mark the fs clean.
5646  *
5647  * Note that only this function cannot bring a filesystem to be in a clean
5648  * state independently. It relies on upper layer to stop all data & metadata
5649  * modifications.
5650  */
5651 static int ext4_freeze(struct super_block *sb)
5652 {
5653         int error = 0;
5654         journal_t *journal;
5655
5656         if (sb_rdonly(sb))
5657                 return 0;
5658
5659         journal = EXT4_SB(sb)->s_journal;
5660
5661         if (journal) {
5662                 /* Now we set up the journal barrier. */
5663                 jbd2_journal_lock_updates(journal);
5664
5665                 /*
5666                  * Don't clear the needs_recovery flag if we failed to
5667                  * flush the journal.
5668                  */
5669                 error = jbd2_journal_flush(journal, 0);
5670                 if (error < 0)
5671                         goto out;
5672
5673                 /* Journal blocked and flushed, clear needs_recovery flag. */
5674                 ext4_clear_feature_journal_needs_recovery(sb);
5675                 if (ext4_orphan_file_empty(sb))
5676                         ext4_clear_feature_orphan_present(sb);
5677         }
5678
5679         error = ext4_commit_super(sb);
5680 out:
5681         if (journal)
5682                 /* we rely on upper layer to stop further updates */
5683                 jbd2_journal_unlock_updates(journal);
5684         return error;
5685 }
5686
5687 /*
5688  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
5689  * flag here, even though the filesystem is not technically dirty yet.
5690  */
5691 static int ext4_unfreeze(struct super_block *sb)
5692 {
5693         if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
5694                 return 0;
5695
5696         if (EXT4_SB(sb)->s_journal) {
5697                 /* Reset the needs_recovery flag before the fs is unlocked. */
5698                 ext4_set_feature_journal_needs_recovery(sb);
5699                 if (ext4_has_feature_orphan_file(sb))
5700                         ext4_set_feature_orphan_present(sb);
5701         }
5702
5703         ext4_commit_super(sb);
5704         return 0;
5705 }
5706
5707 /*
5708  * Structure to save mount options for ext4_remount's benefit
5709  */
5710 struct ext4_mount_options {
5711         unsigned long s_mount_opt;
5712         unsigned long s_mount_opt2;
5713         kuid_t s_resuid;
5714         kgid_t s_resgid;
5715         unsigned long s_commit_interval;
5716         u32 s_min_batch_time, s_max_batch_time;
5717 #ifdef CONFIG_QUOTA
5718         int s_jquota_fmt;
5719         char *s_qf_names[EXT4_MAXQUOTAS];
5720 #endif
5721 };
5722
5723 static int ext4_remount(struct super_block *sb, int *flags, char *data)
5724 {
5725         struct ext4_super_block *es;
5726         struct ext4_sb_info *sbi = EXT4_SB(sb);
5727         unsigned long old_sb_flags, vfs_flags;
5728         struct ext4_mount_options old_opts;
5729         int enable_quota = 0;
5730         ext4_group_t g;
5731         int err = 0;
5732 #ifdef CONFIG_QUOTA
5733         int i, j;
5734         char *to_free[EXT4_MAXQUOTAS];
5735 #endif
5736         char *orig_data = kstrdup(data, GFP_KERNEL);
5737         struct ext4_parsed_options parsed_opts;
5738
5739         parsed_opts.journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
5740         parsed_opts.journal_devnum = 0;
5741
5742         if (data && !orig_data)
5743                 return -ENOMEM;
5744
5745         /* Store the original options */
5746         old_sb_flags = sb->s_flags;
5747         old_opts.s_mount_opt = sbi->s_mount_opt;
5748         old_opts.s_mount_opt2 = sbi->s_mount_opt2;
5749         old_opts.s_resuid = sbi->s_resuid;
5750         old_opts.s_resgid = sbi->s_resgid;
5751         old_opts.s_commit_interval = sbi->s_commit_interval;
5752         old_opts.s_min_batch_time = sbi->s_min_batch_time;
5753         old_opts.s_max_batch_time = sbi->s_max_batch_time;
5754 #ifdef CONFIG_QUOTA
5755         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
5756         for (i = 0; i < EXT4_MAXQUOTAS; i++)
5757                 if (sbi->s_qf_names[i]) {
5758                         char *qf_name = get_qf_name(sb, sbi, i);
5759
5760                         old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
5761                         if (!old_opts.s_qf_names[i]) {
5762                                 for (j = 0; j < i; j++)
5763                                         kfree(old_opts.s_qf_names[j]);
5764                                 kfree(orig_data);
5765                                 return -ENOMEM;
5766                         }
5767                 } else
5768                         old_opts.s_qf_names[i] = NULL;
5769 #endif
5770         if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5771                 parsed_opts.journal_ioprio =
5772                         sbi->s_journal->j_task->io_context->ioprio;
5773
5774         /*
5775          * Some options can be enabled by ext4 and/or by VFS mount flag
5776          * either way we need to make sure it matches in both *flags and
5777          * s_flags. Copy those selected flags from *flags to s_flags
5778          */
5779         vfs_flags = SB_LAZYTIME | SB_I_VERSION;
5780         sb->s_flags = (sb->s_flags & ~vfs_flags) | (*flags & vfs_flags);
5781
5782         if (!parse_options(data, sb, &parsed_opts, 1)) {
5783                 err = -EINVAL;
5784                 goto restore_opts;
5785         }
5786
5787         if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
5788             test_opt(sb, JOURNAL_CHECKSUM)) {
5789                 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
5790                          "during remount not supported; ignoring");
5791                 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
5792         }
5793
5794         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5795                 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5796                         ext4_msg(sb, KERN_ERR, "can't mount with "
5797                                  "both data=journal and delalloc");
5798                         err = -EINVAL;
5799                         goto restore_opts;
5800                 }
5801                 if (test_opt(sb, DIOREAD_NOLOCK)) {
5802                         ext4_msg(sb, KERN_ERR, "can't mount with "
5803                                  "both data=journal and dioread_nolock");
5804                         err = -EINVAL;
5805                         goto restore_opts;
5806                 }
5807         } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5808                 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5809                         ext4_msg(sb, KERN_ERR, "can't mount with "
5810                                 "journal_async_commit in data=ordered mode");
5811                         err = -EINVAL;
5812                         goto restore_opts;
5813                 }
5814         }
5815
5816         if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5817                 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5818                 err = -EINVAL;
5819                 goto restore_opts;
5820         }
5821
5822         if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED))
5823                 ext4_abort(sb, EXT4_ERR_ESHUTDOWN, "Abort forced by user");
5824
5825         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5826                 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
5827
5828         es = sbi->s_es;
5829
5830         if (sbi->s_journal) {
5831                 ext4_init_journal_params(sb, sbi->s_journal);
5832                 set_task_ioprio(sbi->s_journal->j_task, parsed_opts.journal_ioprio);
5833         }
5834
5835         /* Flush outstanding errors before changing fs state */
5836         flush_work(&sbi->s_error_work);
5837
5838         if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
5839                 if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED)) {
5840                         err = -EROFS;
5841                         goto restore_opts;
5842                 }
5843
5844                 if (*flags & SB_RDONLY) {
5845                         err = sync_filesystem(sb);
5846                         if (err < 0)
5847                                 goto restore_opts;
5848                         err = dquot_suspend(sb, -1);
5849                         if (err < 0)
5850                                 goto restore_opts;
5851
5852                         /*
5853                          * First of all, the unconditional stuff we have to do
5854                          * to disable replay of the journal when we next remount
5855                          */
5856                         sb->s_flags |= SB_RDONLY;
5857
5858                         /*
5859                          * OK, test if we are remounting a valid rw partition
5860                          * readonly, and if so set the rdonly flag and then
5861                          * mark the partition as valid again.
5862                          */
5863                         if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5864                             (sbi->s_mount_state & EXT4_VALID_FS))
5865                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
5866
5867                         if (sbi->s_journal) {
5868                                 /*
5869                                  * We let remount-ro finish even if marking fs
5870                                  * as clean failed...
5871                                  */
5872                                 ext4_mark_recovery_complete(sb, es);
5873                         }
5874                 } else {
5875                         /* Make sure we can mount this feature set readwrite */
5876                         if (ext4_has_feature_readonly(sb) ||
5877                             !ext4_feature_set_ok(sb, 0)) {
5878                                 err = -EROFS;
5879                                 goto restore_opts;
5880                         }
5881                         /*
5882                          * Make sure the group descriptor checksums
5883                          * are sane.  If they aren't, refuse to remount r/w.
5884                          */
5885                         for (g = 0; g < sbi->s_groups_count; g++) {
5886                                 struct ext4_group_desc *gdp =
5887                                         ext4_get_group_desc(sb, g, NULL);
5888
5889                                 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
5890                                         ext4_msg(sb, KERN_ERR,
5891                "ext4_remount: Checksum for group %u failed (%u!=%u)",
5892                 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
5893                                                le16_to_cpu(gdp->bg_checksum));
5894                                         err = -EFSBADCRC;
5895                                         goto restore_opts;
5896                                 }
5897                         }
5898
5899                         /*
5900                          * If we have an unprocessed orphan list hanging
5901                          * around from a previously readonly bdev mount,
5902                          * require a full umount/remount for now.
5903                          */
5904                         if (es->s_last_orphan || !ext4_orphan_file_empty(sb)) {
5905                                 ext4_msg(sb, KERN_WARNING, "Couldn't "
5906                                        "remount RDWR because of unprocessed "
5907                                        "orphan inode list.  Please "
5908                                        "umount/remount instead");
5909                                 err = -EINVAL;
5910                                 goto restore_opts;
5911                         }
5912
5913                         /*
5914                          * Mounting a RDONLY partition read-write, so reread
5915                          * and store the current valid flag.  (It may have
5916                          * been changed by e2fsck since we originally mounted
5917                          * the partition.)
5918                          */
5919                         if (sbi->s_journal) {
5920                                 err = ext4_clear_journal_err(sb, es);
5921                                 if (err)
5922                                         goto restore_opts;
5923                         }
5924                         sbi->s_mount_state = le16_to_cpu(es->s_state);
5925
5926                         err = ext4_setup_super(sb, es, 0);
5927                         if (err)
5928                                 goto restore_opts;
5929
5930                         sb->s_flags &= ~SB_RDONLY;
5931                         if (ext4_has_feature_mmp(sb))
5932                                 if (ext4_multi_mount_protect(sb,
5933                                                 le64_to_cpu(es->s_mmp_block))) {
5934                                         err = -EROFS;
5935                                         goto restore_opts;
5936                                 }
5937                         enable_quota = 1;
5938                 }
5939         }
5940
5941         /*
5942          * Reinitialize lazy itable initialization thread based on
5943          * current settings
5944          */
5945         if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
5946                 ext4_unregister_li_request(sb);
5947         else {
5948                 ext4_group_t first_not_zeroed;
5949                 first_not_zeroed = ext4_has_uninit_itable(sb);
5950                 ext4_register_li_request(sb, first_not_zeroed);
5951         }
5952
5953         /*
5954          * Handle creation of system zone data early because it can fail.
5955          * Releasing of existing data is done when we are sure remount will
5956          * succeed.
5957          */
5958         if (test_opt(sb, BLOCK_VALIDITY) && !sbi->s_system_blks) {
5959                 err = ext4_setup_system_zone(sb);
5960                 if (err)
5961                         goto restore_opts;
5962         }
5963
5964         if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
5965                 err = ext4_commit_super(sb);
5966                 if (err)
5967                         goto restore_opts;
5968         }
5969
5970 #ifdef CONFIG_QUOTA
5971         /* Release old quota file names */
5972         for (i = 0; i < EXT4_MAXQUOTAS; i++)
5973                 kfree(old_opts.s_qf_names[i]);
5974         if (enable_quota) {
5975                 if (sb_any_quota_suspended(sb))
5976                         dquot_resume(sb, -1);
5977                 else if (ext4_has_feature_quota(sb)) {
5978                         err = ext4_enable_quotas(sb);
5979                         if (err)
5980                                 goto restore_opts;
5981                 }
5982         }
5983 #endif
5984         if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
5985                 ext4_release_system_zone(sb);
5986
5987         if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))
5988                 ext4_stop_mmpd(sbi);
5989
5990         /*
5991          * Some options can be enabled by ext4 and/or by VFS mount flag
5992          * either way we need to make sure it matches in both *flags and
5993          * s_flags. Copy those selected flags from s_flags to *flags
5994          */
5995         *flags = (*flags & ~vfs_flags) | (sb->s_flags & vfs_flags);
5996
5997         ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s. Quota mode: %s.",
5998                  orig_data, ext4_quota_mode(sb));
5999         kfree(orig_data);
6000         return 0;
6001
6002 restore_opts:
6003         sb->s_flags = old_sb_flags;
6004         sbi->s_mount_opt = old_opts.s_mount_opt;
6005         sbi->s_mount_opt2 = old_opts.s_mount_opt2;
6006         sbi->s_resuid = old_opts.s_resuid;
6007         sbi->s_resgid = old_opts.s_resgid;
6008         sbi->s_commit_interval = old_opts.s_commit_interval;
6009         sbi->s_min_batch_time = old_opts.s_min_batch_time;
6010         sbi->s_max_batch_time = old_opts.s_max_batch_time;
6011         if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
6012                 ext4_release_system_zone(sb);
6013 #ifdef CONFIG_QUOTA
6014         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
6015         for (i = 0; i < EXT4_MAXQUOTAS; i++) {
6016                 to_free[i] = get_qf_name(sb, sbi, i);
6017                 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
6018         }
6019         synchronize_rcu();
6020         for (i = 0; i < EXT4_MAXQUOTAS; i++)
6021                 kfree(to_free[i]);
6022 #endif
6023         if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))
6024                 ext4_stop_mmpd(sbi);
6025         kfree(orig_data);
6026         return err;
6027 }
6028
6029 #ifdef CONFIG_QUOTA
6030 static int ext4_statfs_project(struct super_block *sb,
6031                                kprojid_t projid, struct kstatfs *buf)
6032 {
6033         struct kqid qid;
6034         struct dquot *dquot;
6035         u64 limit;
6036         u64 curblock;
6037
6038         qid = make_kqid_projid(projid);
6039         dquot = dqget(sb, qid);
6040         if (IS_ERR(dquot))
6041                 return PTR_ERR(dquot);
6042         spin_lock(&dquot->dq_dqb_lock);
6043
6044         limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit,
6045                              dquot->dq_dqb.dqb_bhardlimit);
6046         limit >>= sb->s_blocksize_bits;
6047
6048         if (limit && buf->f_blocks > limit) {
6049                 curblock = (dquot->dq_dqb.dqb_curspace +
6050                             dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
6051                 buf->f_blocks = limit;
6052                 buf->f_bfree = buf->f_bavail =
6053                         (buf->f_blocks > curblock) ?
6054                          (buf->f_blocks - curblock) : 0;
6055         }
6056
6057         limit = min_not_zero(dquot->dq_dqb.dqb_isoftlimit,
6058                              dquot->dq_dqb.dqb_ihardlimit);
6059         if (limit && buf->f_files > limit) {
6060                 buf->f_files = limit;
6061                 buf->f_ffree =
6062                         (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
6063                          (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
6064         }
6065
6066         spin_unlock(&dquot->dq_dqb_lock);
6067         dqput(dquot);
6068         return 0;
6069 }
6070 #endif
6071
6072 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
6073 {
6074         struct super_block *sb = dentry->d_sb;
6075         struct ext4_sb_info *sbi = EXT4_SB(sb);
6076         struct ext4_super_block *es = sbi->s_es;
6077         ext4_fsblk_t overhead = 0, resv_blocks;
6078         s64 bfree;
6079         resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
6080
6081         if (!test_opt(sb, MINIX_DF))
6082                 overhead = sbi->s_overhead;
6083
6084         buf->f_type = EXT4_SUPER_MAGIC;
6085         buf->f_bsize = sb->s_blocksize;
6086         buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
6087         bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
6088                 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
6089         /* prevent underflow in case that few free space is available */
6090         buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
6091         buf->f_bavail = buf->f_bfree -
6092                         (ext4_r_blocks_count(es) + resv_blocks);
6093         if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
6094                 buf->f_bavail = 0;
6095         buf->f_files = le32_to_cpu(es->s_inodes_count);
6096         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
6097         buf->f_namelen = EXT4_NAME_LEN;
6098         buf->f_fsid = uuid_to_fsid(es->s_uuid);
6099
6100 #ifdef CONFIG_QUOTA
6101         if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
6102             sb_has_quota_limits_enabled(sb, PRJQUOTA))
6103                 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
6104 #endif
6105         return 0;
6106 }
6107
6108
6109 #ifdef CONFIG_QUOTA
6110
6111 /*
6112  * Helper functions so that transaction is started before we acquire dqio_sem
6113  * to keep correct lock ordering of transaction > dqio_sem
6114  */
6115 static inline struct inode *dquot_to_inode(struct dquot *dquot)
6116 {
6117         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
6118 }
6119
6120 static int ext4_write_dquot(struct dquot *dquot)
6121 {
6122         int ret, err;
6123         handle_t *handle;
6124         struct inode *inode;
6125
6126         inode = dquot_to_inode(dquot);
6127         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
6128                                     EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
6129         if (IS_ERR(handle))
6130                 return PTR_ERR(handle);
6131         ret = dquot_commit(dquot);
6132         err = ext4_journal_stop(handle);
6133         if (!ret)
6134                 ret = err;
6135         return ret;
6136 }
6137
6138 static int ext4_acquire_dquot(struct dquot *dquot)
6139 {
6140         int ret, err;
6141         handle_t *handle;
6142
6143         handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
6144                                     EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
6145         if (IS_ERR(handle))
6146                 return PTR_ERR(handle);
6147         ret = dquot_acquire(dquot);
6148         err = ext4_journal_stop(handle);
6149         if (!ret)
6150                 ret = err;
6151         return ret;
6152 }
6153
6154 static int ext4_release_dquot(struct dquot *dquot)
6155 {
6156         int ret, err;
6157         handle_t *handle;
6158
6159         handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
6160                                     EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
6161         if (IS_ERR(handle)) {
6162                 /* Release dquot anyway to avoid endless cycle in dqput() */
6163                 dquot_release(dquot);
6164                 return PTR_ERR(handle);
6165         }
6166         ret = dquot_release(dquot);
6167         err = ext4_journal_stop(handle);
6168         if (!ret)
6169                 ret = err;
6170         return ret;
6171 }
6172
6173 static int ext4_mark_dquot_dirty(struct dquot *dquot)
6174 {
6175         struct super_block *sb = dquot->dq_sb;
6176
6177         if (ext4_is_quota_journalled(sb)) {
6178                 dquot_mark_dquot_dirty(dquot);
6179                 return ext4_write_dquot(dquot);
6180         } else {
6181                 return dquot_mark_dquot_dirty(dquot);
6182         }
6183 }
6184
6185 static int ext4_write_info(struct super_block *sb, int type)
6186 {
6187         int ret, err;
6188         handle_t *handle;
6189
6190         /* Data block + inode block */
6191         handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
6192         if (IS_ERR(handle))
6193                 return PTR_ERR(handle);
6194         ret = dquot_commit_info(sb, type);
6195         err = ext4_journal_stop(handle);
6196         if (!ret)
6197                 ret = err;
6198         return ret;
6199 }
6200
6201 static void lockdep_set_quota_inode(struct inode *inode, int subclass)
6202 {
6203         struct ext4_inode_info *ei = EXT4_I(inode);
6204
6205         /* The first argument of lockdep_set_subclass has to be
6206          * *exactly* the same as the argument to init_rwsem() --- in
6207          * this case, in init_once() --- or lockdep gets unhappy
6208          * because the name of the lock is set using the
6209          * stringification of the argument to init_rwsem().
6210          */
6211         (void) ei;      /* shut up clang warning if !CONFIG_LOCKDEP */
6212         lockdep_set_subclass(&ei->i_data_sem, subclass);
6213 }
6214
6215 /*
6216  * Standard function to be called on quota_on
6217  */
6218 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
6219                          const struct path *path)
6220 {
6221         int err;
6222
6223         if (!test_opt(sb, QUOTA))
6224                 return -EINVAL;
6225
6226         /* Quotafile not on the same filesystem? */
6227         if (path->dentry->d_sb != sb)
6228                 return -EXDEV;
6229
6230         /* Quota already enabled for this file? */
6231         if (IS_NOQUOTA(d_inode(path->dentry)))
6232                 return -EBUSY;
6233
6234         /* Journaling quota? */
6235         if (EXT4_SB(sb)->s_qf_names[type]) {
6236                 /* Quotafile not in fs root? */
6237                 if (path->dentry->d_parent != sb->s_root)
6238                         ext4_msg(sb, KERN_WARNING,
6239                                 "Quota file not on filesystem root. "
6240                                 "Journaled quota will not work");
6241                 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
6242         } else {
6243                 /*
6244                  * Clear the flag just in case mount options changed since
6245                  * last time.
6246                  */
6247                 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
6248         }
6249
6250         /*
6251          * When we journal data on quota file, we have to flush journal to see
6252          * all updates to the file when we bypass pagecache...
6253          */
6254         if (EXT4_SB(sb)->s_journal &&
6255             ext4_should_journal_data(d_inode(path->dentry))) {
6256                 /*
6257                  * We don't need to lock updates but journal_flush() could
6258                  * otherwise be livelocked...
6259                  */
6260                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
6261                 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
6262                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
6263                 if (err)
6264                         return err;
6265         }
6266
6267         lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
6268         err = dquot_quota_on(sb, type, format_id, path);
6269         if (err) {
6270                 lockdep_set_quota_inode(path->dentry->d_inode,
6271                                              I_DATA_SEM_NORMAL);
6272         } else {
6273                 struct inode *inode = d_inode(path->dentry);
6274                 handle_t *handle;
6275
6276                 /*
6277                  * Set inode flags to prevent userspace from messing with quota
6278                  * files. If this fails, we return success anyway since quotas
6279                  * are already enabled and this is not a hard failure.
6280                  */
6281                 inode_lock(inode);
6282                 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
6283                 if (IS_ERR(handle))
6284                         goto unlock_inode;
6285                 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
6286                 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
6287                                 S_NOATIME | S_IMMUTABLE);
6288                 err = ext4_mark_inode_dirty(handle, inode);
6289                 ext4_journal_stop(handle);
6290         unlock_inode:
6291                 inode_unlock(inode);
6292         }
6293         return err;
6294 }
6295
6296 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
6297                              unsigned int flags)
6298 {
6299         int err;
6300         struct inode *qf_inode;
6301         unsigned long qf_inums[EXT4_MAXQUOTAS] = {
6302                 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
6303                 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
6304                 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
6305         };
6306
6307         BUG_ON(!ext4_has_feature_quota(sb));
6308
6309         if (!qf_inums[type])
6310                 return -EPERM;
6311
6312         qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
6313         if (IS_ERR(qf_inode)) {
6314                 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
6315                 return PTR_ERR(qf_inode);
6316         }
6317
6318         /* Don't account quota for quota files to avoid recursion */
6319         qf_inode->i_flags |= S_NOQUOTA;
6320         lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
6321         err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
6322         if (err)
6323                 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
6324         iput(qf_inode);
6325
6326         return err;
6327 }
6328
6329 /* Enable usage tracking for all quota types. */
6330 int ext4_enable_quotas(struct super_block *sb)
6331 {
6332         int type, err = 0;
6333         unsigned long qf_inums[EXT4_MAXQUOTAS] = {
6334                 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
6335                 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
6336                 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
6337         };
6338         bool quota_mopt[EXT4_MAXQUOTAS] = {
6339                 test_opt(sb, USRQUOTA),
6340                 test_opt(sb, GRPQUOTA),
6341                 test_opt(sb, PRJQUOTA),
6342         };
6343
6344         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
6345         for (type = 0; type < EXT4_MAXQUOTAS; type++) {
6346                 if (qf_inums[type]) {
6347                         err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
6348                                 DQUOT_USAGE_ENABLED |
6349                                 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
6350                         if (err) {
6351                                 ext4_warning(sb,
6352                                         "Failed to enable quota tracking "
6353                                         "(type=%d, err=%d). Please run "
6354                                         "e2fsck to fix.", type, err);
6355                                 for (type--; type >= 0; type--)
6356                                         dquot_quota_off(sb, type);
6357
6358                                 return err;
6359                         }
6360                 }
6361         }
6362         return 0;
6363 }
6364
6365 static int ext4_quota_off(struct super_block *sb, int type)
6366 {
6367         struct inode *inode = sb_dqopt(sb)->files[type];
6368         handle_t *handle;
6369         int err;
6370
6371         /* Force all delayed allocation blocks to be allocated.
6372          * Caller already holds s_umount sem */
6373         if (test_opt(sb, DELALLOC))
6374                 sync_filesystem(sb);
6375
6376         if (!inode || !igrab(inode))
6377                 goto out;
6378
6379         err = dquot_quota_off(sb, type);
6380         if (err || ext4_has_feature_quota(sb))
6381                 goto out_put;
6382
6383         inode_lock(inode);
6384         /*
6385          * Update modification times of quota files when userspace can
6386          * start looking at them. If we fail, we return success anyway since
6387          * this is not a hard failure and quotas are already disabled.
6388          */
6389         handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
6390         if (IS_ERR(handle)) {
6391                 err = PTR_ERR(handle);
6392                 goto out_unlock;
6393         }
6394         EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
6395         inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
6396         inode->i_mtime = inode->i_ctime = current_time(inode);
6397         err = ext4_mark_inode_dirty(handle, inode);
6398         ext4_journal_stop(handle);
6399 out_unlock:
6400         inode_unlock(inode);
6401 out_put:
6402         lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
6403         iput(inode);
6404         return err;
6405 out:
6406         return dquot_quota_off(sb, type);
6407 }
6408
6409 /* Read data from quotafile - avoid pagecache and such because we cannot afford
6410  * acquiring the locks... As quota files are never truncated and quota code
6411  * itself serializes the operations (and no one else should touch the files)
6412  * we don't have to be afraid of races */
6413 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
6414                                size_t len, loff_t off)
6415 {
6416         struct inode *inode = sb_dqopt(sb)->files[type];
6417         ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
6418         int offset = off & (sb->s_blocksize - 1);
6419         int tocopy;
6420         size_t toread;
6421         struct buffer_head *bh;
6422         loff_t i_size = i_size_read(inode);
6423
6424         if (off > i_size)
6425                 return 0;
6426         if (off+len > i_size)
6427                 len = i_size-off;
6428         toread = len;
6429         while (toread > 0) {
6430                 tocopy = sb->s_blocksize - offset < toread ?
6431                                 sb->s_blocksize - offset : toread;
6432                 bh = ext4_bread(NULL, inode, blk, 0);
6433                 if (IS_ERR(bh))
6434                         return PTR_ERR(bh);
6435                 if (!bh)        /* A hole? */
6436                         memset(data, 0, tocopy);
6437                 else
6438                         memcpy(data, bh->b_data+offset, tocopy);
6439                 brelse(bh);
6440                 offset = 0;
6441                 toread -= tocopy;
6442                 data += tocopy;
6443                 blk++;
6444         }
6445         return len;
6446 }
6447
6448 /* Write to quotafile (we know the transaction is already started and has
6449  * enough credits) */
6450 static ssize_t ext4_quota_write(struct super_block *sb, int type,
6451                                 const char *data, size_t len, loff_t off)
6452 {
6453         struct inode *inode = sb_dqopt(sb)->files[type];
6454         ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
6455         int err = 0, err2 = 0, offset = off & (sb->s_blocksize - 1);
6456         int retries = 0;
6457         struct buffer_head *bh;
6458         handle_t *handle = journal_current_handle();
6459
6460         if (EXT4_SB(sb)->s_journal && !handle) {
6461                 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6462                         " cancelled because transaction is not started",
6463                         (unsigned long long)off, (unsigned long long)len);
6464                 return -EIO;
6465         }
6466         /*
6467          * Since we account only one data block in transaction credits,
6468          * then it is impossible to cross a block boundary.
6469          */
6470         if (sb->s_blocksize - offset < len) {
6471                 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6472                         " cancelled because not block aligned",
6473                         (unsigned long long)off, (unsigned long long)len);
6474                 return -EIO;
6475         }
6476
6477         do {
6478                 bh = ext4_bread(handle, inode, blk,
6479                                 EXT4_GET_BLOCKS_CREATE |
6480                                 EXT4_GET_BLOCKS_METADATA_NOFAIL);
6481         } while (PTR_ERR(bh) == -ENOSPC &&
6482                  ext4_should_retry_alloc(inode->i_sb, &retries));
6483         if (IS_ERR(bh))
6484                 return PTR_ERR(bh);
6485         if (!bh)
6486                 goto out;
6487         BUFFER_TRACE(bh, "get write access");
6488         err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE);
6489         if (err) {
6490                 brelse(bh);
6491                 return err;
6492         }
6493         lock_buffer(bh);
6494         memcpy(bh->b_data+offset, data, len);
6495         flush_dcache_page(bh->b_page);
6496         unlock_buffer(bh);
6497         err = ext4_handle_dirty_metadata(handle, NULL, bh);
6498         brelse(bh);
6499 out:
6500         if (inode->i_size < off + len) {
6501                 i_size_write(inode, off + len);
6502                 EXT4_I(inode)->i_disksize = inode->i_size;
6503                 err2 = ext4_mark_inode_dirty(handle, inode);
6504                 if (unlikely(err2 && !err))
6505                         err = err2;
6506         }
6507         return err ? err : len;
6508 }
6509 #endif
6510
6511 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
6512                        const char *dev_name, void *data)
6513 {
6514         return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
6515 }
6516
6517 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
6518 static inline void register_as_ext2(void)
6519 {
6520         int err = register_filesystem(&ext2_fs_type);
6521         if (err)
6522                 printk(KERN_WARNING
6523                        "EXT4-fs: Unable to register as ext2 (%d)\n", err);
6524 }
6525
6526 static inline void unregister_as_ext2(void)
6527 {
6528         unregister_filesystem(&ext2_fs_type);
6529 }
6530
6531 static inline int ext2_feature_set_ok(struct super_block *sb)
6532 {
6533         if (ext4_has_unknown_ext2_incompat_features(sb))
6534                 return 0;
6535         if (sb_rdonly(sb))
6536                 return 1;
6537         if (ext4_has_unknown_ext2_ro_compat_features(sb))
6538                 return 0;
6539         return 1;
6540 }
6541 #else
6542 static inline void register_as_ext2(void) { }
6543 static inline void unregister_as_ext2(void) { }
6544 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
6545 #endif
6546
6547 static inline void register_as_ext3(void)
6548 {
6549         int err = register_filesystem(&ext3_fs_type);
6550         if (err)
6551                 printk(KERN_WARNING
6552                        "EXT4-fs: Unable to register as ext3 (%d)\n", err);
6553 }
6554
6555 static inline void unregister_as_ext3(void)
6556 {
6557         unregister_filesystem(&ext3_fs_type);
6558 }
6559
6560 static inline int ext3_feature_set_ok(struct super_block *sb)
6561 {
6562         if (ext4_has_unknown_ext3_incompat_features(sb))
6563                 return 0;
6564         if (!ext4_has_feature_journal(sb))
6565                 return 0;
6566         if (sb_rdonly(sb))
6567                 return 1;
6568         if (ext4_has_unknown_ext3_ro_compat_features(sb))
6569                 return 0;
6570         return 1;
6571 }
6572
6573 static struct file_system_type ext4_fs_type = {
6574         .owner          = THIS_MODULE,
6575         .name           = "ext4",
6576         .mount          = ext4_mount,
6577         .kill_sb        = kill_block_super,
6578         .fs_flags       = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
6579 };
6580 MODULE_ALIAS_FS("ext4");
6581
6582 /* Shared across all ext4 file systems */
6583 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
6584
6585 static int __init ext4_init_fs(void)
6586 {
6587         int i, err;
6588
6589         ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
6590         ext4_li_info = NULL;
6591
6592         /* Build-time check for flags consistency */
6593         ext4_check_flag_values();
6594
6595         for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
6596                 init_waitqueue_head(&ext4__ioend_wq[i]);
6597
6598         err = ext4_init_es();
6599         if (err)
6600                 return err;
6601
6602         err = ext4_init_pending();
6603         if (err)
6604                 goto out7;
6605
6606         err = ext4_init_post_read_processing();
6607         if (err)
6608                 goto out6;
6609
6610         err = ext4_init_pageio();
6611         if (err)
6612                 goto out5;
6613
6614         err = ext4_init_system_zone();
6615         if (err)
6616                 goto out4;
6617
6618         err = ext4_init_sysfs();
6619         if (err)
6620                 goto out3;
6621
6622         err = ext4_init_mballoc();
6623         if (err)
6624                 goto out2;
6625         err = init_inodecache();
6626         if (err)
6627                 goto out1;
6628
6629         err = ext4_fc_init_dentry_cache();
6630         if (err)
6631                 goto out05;
6632
6633         register_as_ext3();
6634         register_as_ext2();
6635         err = register_filesystem(&ext4_fs_type);
6636         if (err)
6637                 goto out;
6638
6639         return 0;
6640 out:
6641         unregister_as_ext2();
6642         unregister_as_ext3();
6643 out05:
6644         destroy_inodecache();
6645 out1:
6646         ext4_exit_mballoc();
6647 out2:
6648         ext4_exit_sysfs();
6649 out3:
6650         ext4_exit_system_zone();
6651 out4:
6652         ext4_exit_pageio();
6653 out5:
6654         ext4_exit_post_read_processing();
6655 out6:
6656         ext4_exit_pending();
6657 out7:
6658         ext4_exit_es();
6659
6660         return err;
6661 }
6662
6663 static void __exit ext4_exit_fs(void)
6664 {
6665         ext4_destroy_lazyinit_thread();
6666         unregister_as_ext2();
6667         unregister_as_ext3();
6668         unregister_filesystem(&ext4_fs_type);
6669         destroy_inodecache();
6670         ext4_exit_mballoc();
6671         ext4_exit_sysfs();
6672         ext4_exit_system_zone();
6673         ext4_exit_pageio();
6674         ext4_exit_post_read_processing();
6675         ext4_exit_es();
6676         ext4_exit_pending();
6677 }
6678
6679 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
6680 MODULE_DESCRIPTION("Fourth Extended Filesystem");
6681 MODULE_LICENSE("GPL");
6682 MODULE_SOFTDEP("pre: crc32c");
6683 module_init(ext4_init_fs)
6684 module_exit(ext4_exit_fs)