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
  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 struct 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 int ext4_commit_super(struct super_block *sb, int sync);
  69 static void ext4_mark_recovery_complete(struct super_block *sb,
  70                                         struct ext4_super_block *es);
  71 static void ext4_clear_journal_err(struct super_block *sb,
  72                                    struct ext4_super_block *es);
  73 static int ext4_sync_fs(struct super_block *sb, int wait);
  74 static int ext4_remount(struct super_block *sb, int *flags, char *data);
  75 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
  76 static int ext4_unfreeze(struct super_block *sb);
  77 static int ext4_freeze(struct super_block *sb);
  78 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
  79                        const char *dev_name, void *data);
  80 static inline int ext2_feature_set_ok(struct super_block *sb);
  81 static inline int ext3_feature_set_ok(struct super_block *sb);
  82 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
  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  * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
  93  * i_mmap_rwsem (inode->i_mmap_rwsem)!
  94  *
  95  * page fault path:
  96  * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
  97  *   page lock -> i_data_sem (rw)
  98  *
  99  * buffered write path:
 100  * sb_start_write -> i_mutex -> mmap_sem
 101  * sb_start_write -> i_mutex -> transaction start -> page lock ->
 102  *   i_data_sem (rw)
 103  *
 104  * truncate:
 105  * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock
 106  * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start ->
 107  *   i_data_sem (rw)
 108  *
 109  * direct IO:
 110  * sb_start_write -> i_mutex -> mmap_sem
 111  * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
 112  *
 113  * writepages:
 114  * transaction start -> page lock(s) -> i_data_sem (rw)
 115  */
 116
 117 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
 118 static struct file_system_type ext2_fs_type = {
 119         .owner          = THIS_MODULE,
 120         .name           = "ext2",
 121         .mount          = ext4_mount,
 122         .kill_sb        = kill_block_super,
 123         .fs_flags       = FS_REQUIRES_DEV,
 124 };
 125 MODULE_ALIAS_FS("ext2");
 126 MODULE_ALIAS("ext2");
 127 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
 128 #else
 129 #define IS_EXT2_SB(sb) (0)
 130 #endif
 131
 132
 133 static struct file_system_type ext3_fs_type = {
 134         .owner          = THIS_MODULE,
 135         .name           = "ext3",
 136         .mount          = ext4_mount,
 137         .kill_sb        = kill_block_super,
 138         .fs_flags       = FS_REQUIRES_DEV,
 139 };
 140 MODULE_ALIAS_FS("ext3");
 141 MODULE_ALIAS("ext3");
 142 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
 143
 144 /*
 145  * This works like sb_bread() except it uses ERR_PTR for error
 146  * returns.  Currently with sb_bread it's impossible to distinguish
 147  * between ENOMEM and EIO situations (since both result in a NULL
 148  * return.
 149  */
 150 struct buffer_head *
 151 ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags)
 152 {
 153         struct buffer_head *bh = sb_getblk(sb, block);
 154
 155         if (bh == NULL)
 156                 return ERR_PTR(-ENOMEM);
 157         if (buffer_uptodate(bh))
 158                 return bh;
 159         ll_rw_block(REQ_OP_READ, REQ_META | op_flags, 1, &bh);
 160         wait_on_buffer(bh);
 161         if (buffer_uptodate(bh))
 162                 return bh;
 163         put_bh(bh);
 164         return ERR_PTR(-EIO);
 165 }
 166
 167 static int ext4_verify_csum_type(struct super_block *sb,
 168                                  struct ext4_super_block *es)
 169 {
 170         if (!ext4_has_feature_metadata_csum(sb))
 171                 return 1;
 172
 173         return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
 174 }
 175
 176 static __le32 ext4_superblock_csum(struct super_block *sb,
 177                                    struct ext4_super_block *es)
 178 {
 179         struct ext4_sb_info *sbi = EXT4_SB(sb);
 180         int offset = offsetof(struct ext4_super_block, s_checksum);
 181         __u32 csum;
 182
 183         csum = ext4_chksum(sbi, ~0, (char *)es, offset);
 184
 185         return cpu_to_le32(csum);
 186 }
 187
 188 static int ext4_superblock_csum_verify(struct super_block *sb,
 189                                        struct ext4_super_block *es)
 190 {
 191         if (!ext4_has_metadata_csum(sb))
 192                 return 1;
 193
 194         return es->s_checksum == ext4_superblock_csum(sb, es);
 195 }
 196
 197 void ext4_superblock_csum_set(struct super_block *sb)
 198 {
 199         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
 200
 201         if (!ext4_has_metadata_csum(sb))
 202                 return;
 203
 204         es->s_checksum = ext4_superblock_csum(sb, es);
 205 }
 206
 207 void *ext4_kvmalloc(size_t size, gfp_t flags)
 208 {
 209         void *ret;
 210
 211         ret = kmalloc(size, flags | __GFP_NOWARN);
 212         if (!ret)
 213                 ret = __vmalloc(size, flags, PAGE_KERNEL);
 214         return ret;
 215 }
 216
 217 void *ext4_kvzalloc(size_t size, gfp_t flags)
 218 {
 219         void *ret;
 220
 221         ret = kzalloc(size, flags | __GFP_NOWARN);
 222         if (!ret)
 223                 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
 224         return ret;
 225 }
 226
 227 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
 228                                struct ext4_group_desc *bg)
 229 {
 230         return le32_to_cpu(bg->bg_block_bitmap_lo) |
 231                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 232                  (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
 233 }
 234
 235 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
 236                                struct ext4_group_desc *bg)
 237 {
 238         return le32_to_cpu(bg->bg_inode_bitmap_lo) |
 239                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 240                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
 241 }
 242
 243 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
 244                               struct ext4_group_desc *bg)
 245 {
 246         return le32_to_cpu(bg->bg_inode_table_lo) |
 247                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 248                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
 249 }
 250
 251 __u32 ext4_free_group_clusters(struct super_block *sb,
 252                                struct ext4_group_desc *bg)
 253 {
 254         return le16_to_cpu(bg->bg_free_blocks_count_lo) |
 255                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 256                  (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
 257 }
 258
 259 __u32 ext4_free_inodes_count(struct super_block *sb,
 260                               struct ext4_group_desc *bg)
 261 {
 262         return le16_to_cpu(bg->bg_free_inodes_count_lo) |
 263                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 264                  (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
 265 }
 266
 267 __u32 ext4_used_dirs_count(struct super_block *sb,
 268                               struct ext4_group_desc *bg)
 269 {
 270         return le16_to_cpu(bg->bg_used_dirs_count_lo) |
 271                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 272                  (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
 273 }
 274
 275 __u32 ext4_itable_unused_count(struct super_block *sb,
 276                               struct ext4_group_desc *bg)
 277 {
 278         return le16_to_cpu(bg->bg_itable_unused_lo) |
 279                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 280                  (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
 281 }
 282
 283 void ext4_block_bitmap_set(struct super_block *sb,
 284                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
 285 {
 286         bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
 287         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 288                 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
 289 }
 290
 291 void ext4_inode_bitmap_set(struct super_block *sb,
 292                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
 293 {
 294         bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
 295         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 296                 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
 297 }
 298
 299 void ext4_inode_table_set(struct super_block *sb,
 300                           struct ext4_group_desc *bg, ext4_fsblk_t blk)
 301 {
 302         bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
 303         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 304                 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
 305 }
 306
 307 void ext4_free_group_clusters_set(struct super_block *sb,
 308                                   struct ext4_group_desc *bg, __u32 count)
 309 {
 310         bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
 311         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 312                 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
 313 }
 314
 315 void ext4_free_inodes_set(struct super_block *sb,
 316                           struct ext4_group_desc *bg, __u32 count)
 317 {
 318         bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
 319         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 320                 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
 321 }
 322
 323 void ext4_used_dirs_set(struct super_block *sb,
 324                           struct ext4_group_desc *bg, __u32 count)
 325 {
 326         bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
 327         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 328                 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
 329 }
 330
 331 void ext4_itable_unused_set(struct super_block *sb,
 332                           struct ext4_group_desc *bg, __u32 count)
 333 {
 334         bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
 335         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 336                 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
 337 }
 338
 339 static void __ext4_update_tstamp(__le32 *lo, __u8 *hi)
 340 {
 341         time64_t now = ktime_get_real_seconds();
 342
 343         now = clamp_val(now, 0, (1ull << 40) - 1);
 344
 345         *lo = cpu_to_le32(lower_32_bits(now));
 346         *hi = upper_32_bits(now);
 347 }
 348
 349 static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
 350 {
 351         return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
 352 }
 353 #define ext4_update_tstamp(es, tstamp) \
 354         __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
 355 #define ext4_get_tstamp(es, tstamp) \
 356         __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
 357
 358 static void __save_error_info(struct super_block *sb, const char *func,
 359                             unsigned int line)
 360 {
 361         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
 362
 363         EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
 364         if (bdev_read_only(sb->s_bdev))
 365                 return;
 366         es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
 367         ext4_update_tstamp(es, s_last_error_time);
 368         strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
 369         es->s_last_error_line = cpu_to_le32(line);
 370         if (!es->s_first_error_time) {
 371                 es->s_first_error_time = es->s_last_error_time;
 372                 es->s_first_error_time_hi = es->s_last_error_time_hi;
 373                 strncpy(es->s_first_error_func, func,
 374                         sizeof(es->s_first_error_func));
 375                 es->s_first_error_line = cpu_to_le32(line);
 376                 es->s_first_error_ino = es->s_last_error_ino;
 377                 es->s_first_error_block = es->s_last_error_block;
 378         }
 379         /*
 380          * Start the daily error reporting function if it hasn't been
 381          * started already
 382          */
 383         if (!es->s_error_count)
 384                 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
 385         le32_add_cpu(&es->s_error_count, 1);
 386 }
 387
 388 static void save_error_info(struct super_block *sb, const char *func,
 389                             unsigned int line)
 390 {
 391         __save_error_info(sb, func, line);
 392         ext4_commit_super(sb, 1);
 393 }
 394
 395 /*
 396  * The del_gendisk() function uninitializes the disk-specific data
 397  * structures, including the bdi structure, without telling anyone
 398  * else.  Once this happens, any attempt to call mark_buffer_dirty()
 399  * (for example, by ext4_commit_super), will cause a kernel OOPS.
 400  * This is a kludge to prevent these oops until we can put in a proper
 401  * hook in del_gendisk() to inform the VFS and file system layers.
 402  */
 403 static int block_device_ejected(struct super_block *sb)
 404 {
 405         struct inode *bd_inode = sb->s_bdev->bd_inode;
 406         struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
 407
 408         return bdi->dev == NULL;
 409 }
 410
 411 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
 412 {
 413         struct super_block              *sb = journal->j_private;
 414         struct ext4_sb_info             *sbi = EXT4_SB(sb);
 415         int                             error = is_journal_aborted(journal);
 416         struct ext4_journal_cb_entry    *jce;
 417
 418         BUG_ON(txn->t_state == T_FINISHED);
 419
 420         ext4_process_freed_data(sb, txn->t_tid);
 421
 422         spin_lock(&sbi->s_md_lock);
 423         while (!list_empty(&txn->t_private_list)) {
 424                 jce = list_entry(txn->t_private_list.next,
 425                                  struct ext4_journal_cb_entry, jce_list);
 426                 list_del_init(&jce->jce_list);
 427                 spin_unlock(&sbi->s_md_lock);
 428                 jce->jce_func(sb, jce, error);
 429                 spin_lock(&sbi->s_md_lock);
 430         }
 431         spin_unlock(&sbi->s_md_lock);
 432 }
 433
 434 static bool system_going_down(void)
 435 {
 436         return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
 437                 || system_state == SYSTEM_RESTART;
 438 }
 439
 440 /* Deal with the reporting of failure conditions on a filesystem such as
 441  * inconsistencies detected or read IO failures.
 442  *
 443  * On ext2, we can store the error state of the filesystem in the
 444  * superblock.  That is not possible on ext4, because we may have other
 445  * write ordering constraints on the superblock which prevent us from
 446  * writing it out straight away; and given that the journal is about to
 447  * be aborted, we can't rely on the current, or future, transactions to
 448  * write out the superblock safely.
 449  *
 450  * We'll just use the jbd2_journal_abort() error code to record an error in
 451  * the journal instead.  On recovery, the journal will complain about
 452  * that error until we've noted it down and cleared it.
 453  */
 454
 455 static void ext4_handle_error(struct super_block *sb)
 456 {
 457         if (test_opt(sb, WARN_ON_ERROR))
 458                 WARN_ON_ONCE(1);
 459
 460         if (sb_rdonly(sb))
 461                 return;
 462
 463         if (!test_opt(sb, ERRORS_CONT)) {
 464                 journal_t *journal = EXT4_SB(sb)->s_journal;
 465
 466                 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
 467                 if (journal)
 468                         jbd2_journal_abort(journal, -EIO);
 469         }
 470         /*
 471          * We force ERRORS_RO behavior when system is rebooting. Otherwise we
 472          * could panic during 'reboot -f' as the underlying device got already
 473          * disabled.
 474          */
 475         if (test_opt(sb, ERRORS_RO) || system_going_down()) {
 476                 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
 477                 /*
 478                  * Make sure updated value of ->s_mount_flags will be visible
 479                  * before ->s_flags update
 480                  */
 481                 smp_wmb();
 482                 sb->s_flags |= SB_RDONLY;
 483         } else if (test_opt(sb, ERRORS_PANIC)) {
 484                 if (EXT4_SB(sb)->s_journal &&
 485                   !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
 486                         return;
 487                 panic("EXT4-fs (device %s): panic forced after error\n",
 488                         sb->s_id);
 489         }
 490 }
 491
 492 #define ext4_error_ratelimit(sb)                                        \
 493                 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state),     \
 494                              "EXT4-fs error")
 495
 496 void __ext4_error(struct super_block *sb, const char *function,
 497                   unsigned int line, const char *fmt, ...)
 498 {
 499         struct va_format vaf;
 500         va_list args;
 501
 502         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 503                 return;
 504
 505         trace_ext4_error(sb, function, line);
 506         if (ext4_error_ratelimit(sb)) {
 507                 va_start(args, fmt);
 508                 vaf.fmt = fmt;
 509                 vaf.va = &args;
 510                 printk(KERN_CRIT
 511                        "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
 512                        sb->s_id, function, line, current->comm, &vaf);
 513                 va_end(args);
 514         }
 515         save_error_info(sb, function, line);
 516         ext4_handle_error(sb);
 517 }
 518
 519 void __ext4_error_inode(struct inode *inode, const char *function,
 520                         unsigned int line, ext4_fsblk_t block,
 521                         const char *fmt, ...)
 522 {
 523         va_list args;
 524         struct va_format vaf;
 525         struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
 526
 527         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 528                 return;
 529
 530         trace_ext4_error(inode->i_sb, function, line);
 531         es->s_last_error_ino = cpu_to_le32(inode->i_ino);
 532         es->s_last_error_block = cpu_to_le64(block);
 533         if (ext4_error_ratelimit(inode->i_sb)) {
 534                 va_start(args, fmt);
 535                 vaf.fmt = fmt;
 536                 vaf.va = &args;
 537                 if (block)
 538                         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
 539                                "inode #%lu: block %llu: comm %s: %pV\n",
 540                                inode->i_sb->s_id, function, line, inode->i_ino,
 541                                block, current->comm, &vaf);
 542                 else
 543                         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
 544                                "inode #%lu: comm %s: %pV\n",
 545                                inode->i_sb->s_id, function, line, inode->i_ino,
 546                                current->comm, &vaf);
 547                 va_end(args);
 548         }
 549         save_error_info(inode->i_sb, function, line);
 550         ext4_handle_error(inode->i_sb);
 551 }
 552
 553 void __ext4_error_file(struct file *file, const char *function,
 554                        unsigned int line, ext4_fsblk_t block,
 555                        const char *fmt, ...)
 556 {
 557         va_list args;
 558         struct va_format vaf;
 559         struct ext4_super_block *es;
 560         struct inode *inode = file_inode(file);
 561         char pathname[80], *path;
 562
 563         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 564                 return;
 565
 566         trace_ext4_error(inode->i_sb, function, line);
 567         es = EXT4_SB(inode->i_sb)->s_es;
 568         es->s_last_error_ino = cpu_to_le32(inode->i_ino);
 569         if (ext4_error_ratelimit(inode->i_sb)) {
 570                 path = file_path(file, pathname, sizeof(pathname));
 571                 if (IS_ERR(path))
 572                         path = "(unknown)";
 573                 va_start(args, fmt);
 574                 vaf.fmt = fmt;
 575                 vaf.va = &args;
 576                 if (block)
 577                         printk(KERN_CRIT
 578                                "EXT4-fs error (device %s): %s:%d: inode #%lu: "
 579                                "block %llu: comm %s: path %s: %pV\n",
 580                                inode->i_sb->s_id, function, line, inode->i_ino,
 581                                block, current->comm, path, &vaf);
 582                 else
 583                         printk(KERN_CRIT
 584                                "EXT4-fs error (device %s): %s:%d: inode #%lu: "
 585                                "comm %s: path %s: %pV\n",
 586                                inode->i_sb->s_id, function, line, inode->i_ino,
 587                                current->comm, path, &vaf);
 588                 va_end(args);
 589         }
 590         save_error_info(inode->i_sb, function, line);
 591         ext4_handle_error(inode->i_sb);
 592 }
 593
 594 const char *ext4_decode_error(struct super_block *sb, int errno,
 595                               char nbuf[16])
 596 {
 597         char *errstr = NULL;
 598
 599         switch (errno) {
 600         case -EFSCORRUPTED:
 601                 errstr = "Corrupt filesystem";
 602                 break;
 603         case -EFSBADCRC:
 604                 errstr = "Filesystem failed CRC";
 605                 break;
 606         case -EIO:
 607                 errstr = "IO failure";
 608                 break;
 609         case -ENOMEM:
 610                 errstr = "Out of memory";
 611                 break;
 612         case -EROFS:
 613                 if (!sb || (EXT4_SB(sb)->s_journal &&
 614                             EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
 615                         errstr = "Journal has aborted";
 616                 else
 617                         errstr = "Readonly filesystem";
 618                 break;
 619         default:
 620                 /* If the caller passed in an extra buffer for unknown
 621                  * errors, textualise them now.  Else we just return
 622                  * NULL. */
 623                 if (nbuf) {
 624                         /* Check for truncated error codes... */
 625                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 626                                 errstr = nbuf;
 627                 }
 628                 break;
 629         }
 630
 631         return errstr;
 632 }
 633
 634 /* __ext4_std_error decodes expected errors from journaling functions
 635  * automatically and invokes the appropriate error response.  */
 636
 637 void __ext4_std_error(struct super_block *sb, const char *function,
 638                       unsigned int line, int errno)
 639 {
 640         char nbuf[16];
 641         const char *errstr;
 642
 643         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 644                 return;
 645
 646         /* Special case: if the error is EROFS, and we're not already
 647          * inside a transaction, then there's really no point in logging
 648          * an error. */
 649         if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
 650                 return;
 651
 652         if (ext4_error_ratelimit(sb)) {
 653                 errstr = ext4_decode_error(sb, errno, nbuf);
 654                 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
 655                        sb->s_id, function, line, errstr);
 656         }
 657
 658         save_error_info(sb, function, line);
 659         ext4_handle_error(sb);
 660 }
 661
 662 /*
 663  * ext4_abort is a much stronger failure handler than ext4_error.  The
 664  * abort function may be used to deal with unrecoverable failures such
 665  * as journal IO errors or ENOMEM at a critical moment in log management.
 666  *
 667  * We unconditionally force the filesystem into an ABORT|READONLY state,
 668  * unless the error response on the fs has been set to panic in which
 669  * case we take the easy way out and panic immediately.
 670  */
 671
 672 void __ext4_abort(struct super_block *sb, const char *function,
 673                 unsigned int line, const char *fmt, ...)
 674 {
 675         struct va_format vaf;
 676         va_list args;
 677
 678         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 679                 return;
 680
 681         save_error_info(sb, function, line);
 682         va_start(args, fmt);
 683         vaf.fmt = fmt;
 684         vaf.va = &args;
 685         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
 686                sb->s_id, function, line, &vaf);
 687         va_end(args);
 688
 689         if (sb_rdonly(sb) == 0) {
 690                 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
 691                 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
 692                 /*
 693                  * Make sure updated value of ->s_mount_flags will be visible
 694                  * before ->s_flags update
 695                  */
 696                 smp_wmb();
 697                 sb->s_flags |= SB_RDONLY;
 698                 if (EXT4_SB(sb)->s_journal)
 699                         jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
 700                 save_error_info(sb, function, line);
 701         }
 702         if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
 703                 if (EXT4_SB(sb)->s_journal &&
 704                   !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
 705                         return;
 706                 panic("EXT4-fs panic from previous error\n");
 707         }
 708 }
 709
 710 void __ext4_msg(struct super_block *sb,
 711                 const char *prefix, const char *fmt, ...)
 712 {
 713         struct va_format vaf;
 714         va_list args;
 715
 716         if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
 717                 return;
 718
 719         va_start(args, fmt);
 720         vaf.fmt = fmt;
 721         vaf.va = &args;
 722         printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
 723         va_end(args);
 724 }
 725
 726 #define ext4_warning_ratelimit(sb)                                      \
 727                 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
 728                              "EXT4-fs warning")
 729
 730 void __ext4_warning(struct super_block *sb, const char *function,
 731                     unsigned int line, const char *fmt, ...)
 732 {
 733         struct va_format vaf;
 734         va_list args;
 735
 736         if (!ext4_warning_ratelimit(sb))
 737                 return;
 738
 739         va_start(args, fmt);
 740         vaf.fmt = fmt;
 741         vaf.va = &args;
 742         printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
 743                sb->s_id, function, line, &vaf);
 744         va_end(args);
 745 }
 746
 747 void __ext4_warning_inode(const struct inode *inode, const char *function,
 748                           unsigned int line, const char *fmt, ...)
 749 {
 750         struct va_format vaf;
 751         va_list args;
 752
 753         if (!ext4_warning_ratelimit(inode->i_sb))
 754                 return;
 755
 756         va_start(args, fmt);
 757         vaf.fmt = fmt;
 758         vaf.va = &args;
 759         printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
 760                "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
 761                function, line, inode->i_ino, current->comm, &vaf);
 762         va_end(args);
 763 }
 764
 765 void __ext4_grp_locked_error(const char *function, unsigned int line,
 766                              struct super_block *sb, ext4_group_t grp,
 767                              unsigned long ino, ext4_fsblk_t block,
 768                              const char *fmt, ...)
 769 __releases(bitlock)
 770 __acquires(bitlock)
 771 {
 772         struct va_format vaf;
 773         va_list args;
 774         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
 775
 776         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 777                 return;
 778
 779         trace_ext4_error(sb, function, line);
 780         es->s_last_error_ino = cpu_to_le32(ino);
 781         es->s_last_error_block = cpu_to_le64(block);
 782         __save_error_info(sb, function, line);
 783
 784         if (ext4_error_ratelimit(sb)) {
 785                 va_start(args, fmt);
 786                 vaf.fmt = fmt;
 787                 vaf.va = &args;
 788                 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
 789                        sb->s_id, function, line, grp);
 790                 if (ino)
 791                         printk(KERN_CONT "inode %lu: ", ino);
 792                 if (block)
 793                         printk(KERN_CONT "block %llu:",
 794                                (unsigned long long) block);
 795                 printk(KERN_CONT "%pV\n", &vaf);
 796                 va_end(args);
 797         }
 798
 799         if (test_opt(sb, WARN_ON_ERROR))
 800                 WARN_ON_ONCE(1);
 801
 802         if (test_opt(sb, ERRORS_CONT)) {
 803                 ext4_commit_super(sb, 0);
 804                 return;
 805         }
 806
 807         ext4_unlock_group(sb, grp);
 808         ext4_commit_super(sb, 1);
 809         ext4_handle_error(sb);
 810         /*
 811          * We only get here in the ERRORS_RO case; relocking the group
 812          * may be dangerous, but nothing bad will happen since the
 813          * filesystem will have already been marked read/only and the
 814          * journal has been aborted.  We return 1 as a hint to callers
 815          * who might what to use the return value from
 816          * ext4_grp_locked_error() to distinguish between the
 817          * ERRORS_CONT and ERRORS_RO case, and perhaps return more
 818          * aggressively from the ext4 function in question, with a
 819          * more appropriate error code.
 820          */
 821         ext4_lock_group(sb, grp);
 822         return;
 823 }
 824
 825 void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
 826                                      ext4_group_t group,
 827                                      unsigned int flags)
 828 {
 829         struct ext4_sb_info *sbi = EXT4_SB(sb);
 830         struct ext4_group_info *grp = ext4_get_group_info(sb, group);
 831         struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
 832         int ret;
 833
 834         if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
 835                 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
 836                                             &grp->bb_state);
 837                 if (!ret)
 838                         percpu_counter_sub(&sbi->s_freeclusters_counter,
 839                                            grp->bb_free);
 840         }
 841
 842         if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
 843                 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
 844                                             &grp->bb_state);
 845                 if (!ret && gdp) {
 846                         int count;
 847
 848                         count = ext4_free_inodes_count(sb, gdp);
 849                         percpu_counter_sub(&sbi->s_freeinodes_counter,
 850                                            count);
 851                 }
 852         }
 853 }
 854
 855 void ext4_update_dynamic_rev(struct super_block *sb)
 856 {
 857         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
 858
 859         if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
 860                 return;
 861
 862         ext4_warning(sb,
 863                      "updating to rev %d because of new feature flag, "
 864                      "running e2fsck is recommended",
 865                      EXT4_DYNAMIC_REV);
 866
 867         es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
 868         es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
 869         es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
 870         /* leave es->s_feature_*compat flags alone */
 871         /* es->s_uuid will be set by e2fsck if empty */
 872
 873         /*
 874          * The rest of the superblock fields should be zero, and if not it
 875          * means they are likely already in use, so leave them alone.  We
 876          * can leave it up to e2fsck to clean up any inconsistencies there.
 877          */
 878 }
 879
 880 /*
 881  * Open the external journal device
 882  */
 883 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
 884 {
 885         struct block_device *bdev;
 886         char b[BDEVNAME_SIZE];
 887
 888         bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
 889         if (IS_ERR(bdev))
 890                 goto fail;
 891         return bdev;
 892
 893 fail:
 894         ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
 895                         __bdevname(dev, b), PTR_ERR(bdev));
 896         return NULL;
 897 }
 898
 899 /*
 900  * Release the journal device
 901  */
 902 static void ext4_blkdev_put(struct block_device *bdev)
 903 {
 904         blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 905 }
 906
 907 static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
 908 {
 909         struct block_device *bdev;
 910         bdev = sbi->journal_bdev;
 911         if (bdev) {
 912                 ext4_blkdev_put(bdev);
 913                 sbi->journal_bdev = NULL;
 914         }
 915 }
 916
 917 static inline struct inode *orphan_list_entry(struct list_head *l)
 918 {
 919         return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
 920 }
 921
 922 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
 923 {
 924         struct list_head *l;
 925
 926         ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
 927                  le32_to_cpu(sbi->s_es->s_last_orphan));
 928
 929         printk(KERN_ERR "sb_info orphan list:\n");
 930         list_for_each(l, &sbi->s_orphan) {
 931                 struct inode *inode = orphan_list_entry(l);
 932                 printk(KERN_ERR "  "
 933                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 934                        inode->i_sb->s_id, inode->i_ino, inode,
 935                        inode->i_mode, inode->i_nlink,
 936                        NEXT_ORPHAN(inode));
 937         }
 938 }
 939
 940 #ifdef CONFIG_QUOTA
 941 static int ext4_quota_off(struct super_block *sb, int type);
 942
 943 static inline void ext4_quota_off_umount(struct super_block *sb)
 944 {
 945         int type;
 946
 947         /* Use our quota_off function to clear inode flags etc. */
 948         for (type = 0; type < EXT4_MAXQUOTAS; type++)
 949                 ext4_quota_off(sb, type);
 950 }
 951
 952 /*
 953  * This is a helper function which is used in the mount/remount
 954  * codepaths (which holds s_umount) to fetch the quota file name.
 955  */
 956 static inline char *get_qf_name(struct super_block *sb,
 957                                 struct ext4_sb_info *sbi,
 958                                 int type)
 959 {
 960         return rcu_dereference_protected(sbi->s_qf_names[type],
 961                                          lockdep_is_held(&sb->s_umount));
 962 }
 963 #else
 964 static inline void ext4_quota_off_umount(struct super_block *sb)
 965 {
 966 }
 967 #endif
 968
 969 static void ext4_put_super(struct super_block *sb)
 970 {
 971         struct ext4_sb_info *sbi = EXT4_SB(sb);
 972         struct ext4_super_block *es = sbi->s_es;
 973         int aborted = 0;
 974         int i, err;
 975
 976         ext4_unregister_li_request(sb);
 977         ext4_quota_off_umount(sb);
 978
 979         destroy_workqueue(sbi->rsv_conversion_wq);
 980
 981         if (sbi->s_journal) {
 982                 aborted = is_journal_aborted(sbi->s_journal);
 983                 err = jbd2_journal_destroy(sbi->s_journal);
 984                 sbi->s_journal = NULL;
 985                 if ((err < 0) && !aborted)
 986                         ext4_abort(sb, "Couldn't clean up the journal");
 987         }
 988
 989         ext4_unregister_sysfs(sb);
 990         ext4_es_unregister_shrinker(sbi);
 991         del_timer_sync(&sbi->s_err_report);
 992         ext4_release_system_zone(sb);
 993         ext4_mb_release(sb);
 994         ext4_ext_release(sb);
 995
 996         if (!sb_rdonly(sb) && !aborted) {
 997                 ext4_clear_feature_journal_needs_recovery(sb);
 998                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 999         }
1000         if (!sb_rdonly(sb))
1001                 ext4_commit_super(sb, 1);
1002
1003         for (i = 0; i < sbi->s_gdb_count; i++)
1004                 brelse(sbi->s_group_desc[i]);
1005         kvfree(sbi->s_group_desc);
1006         kvfree(sbi->s_flex_groups);
1007         percpu_counter_destroy(&sbi->s_freeclusters_counter);
1008         percpu_counter_destroy(&sbi->s_freeinodes_counter);
1009         percpu_counter_destroy(&sbi->s_dirs_counter);
1010         percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1011         percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
1012 #ifdef CONFIG_QUOTA
1013         for (i = 0; i < EXT4_MAXQUOTAS; i++)
1014                 kfree(get_qf_name(sb, sbi, i));
1015 #endif
1016
1017         /* Debugging code just in case the in-memory inode orphan list
1018          * isn't empty.  The on-disk one can be non-empty if we've
1019          * detected an error and taken the fs readonly, but the
1020          * in-memory list had better be clean by this point. */
1021         if (!list_empty(&sbi->s_orphan))
1022                 dump_orphan_list(sb, sbi);
1023         J_ASSERT(list_empty(&sbi->s_orphan));
1024
1025         sync_blockdev(sb->s_bdev);
1026         invalidate_bdev(sb->s_bdev);
1027         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
1028                 /*
1029                  * Invalidate the journal device's buffers.  We don't want them
1030                  * floating about in memory - the physical journal device may
1031                  * hotswapped, and it breaks the `ro-after' testing code.
1032                  */
1033                 sync_blockdev(sbi->journal_bdev);
1034                 invalidate_bdev(sbi->journal_bdev);
1035                 ext4_blkdev_remove(sbi);
1036         }
1037
1038         ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1039         sbi->s_ea_inode_cache = NULL;
1040
1041         ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1042         sbi->s_ea_block_cache = NULL;
1043
1044         if (sbi->s_mmp_tsk)
1045                 kthread_stop(sbi->s_mmp_tsk);
1046         brelse(sbi->s_sbh);
1047         sb->s_fs_info = NULL;
1048         /*
1049          * Now that we are completely done shutting down the
1050          * superblock, we need to actually destroy the kobject.
1051          */
1052         kobject_put(&sbi->s_kobj);
1053         wait_for_completion(&sbi->s_kobj_unregister);
1054         if (sbi->s_chksum_driver)
1055                 crypto_free_shash(sbi->s_chksum_driver);
1056         kfree(sbi->s_blockgroup_lock);
1057         fs_put_dax(sbi->s_daxdev);
1058 #ifdef CONFIG_UNICODE
1059         utf8_unload(sbi->s_encoding);
1060 #endif
1061         kfree(sbi);
1062 }
1063
1064 static struct kmem_cache *ext4_inode_cachep;
1065
1066 /*
1067  * Called inside transaction, so use GFP_NOFS
1068  */
1069 static struct inode *ext4_alloc_inode(struct super_block *sb)
1070 {
1071         struct ext4_inode_info *ei;
1072
1073         ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
1074         if (!ei)
1075                 return NULL;
1076
1077         inode_set_iversion(&ei->vfs_inode, 1);
1078         spin_lock_init(&ei->i_raw_lock);
1079         INIT_LIST_HEAD(&ei->i_prealloc_list);
1080         spin_lock_init(&ei->i_prealloc_lock);
1081         ext4_es_init_tree(&ei->i_es_tree);
1082         rwlock_init(&ei->i_es_lock);
1083         INIT_LIST_HEAD(&ei->i_es_list);
1084         ei->i_es_all_nr = 0;
1085         ei->i_es_shk_nr = 0;
1086         ei->i_es_shrink_lblk = 0;
1087         ei->i_reserved_data_blocks = 0;
1088         ei->i_da_metadata_calc_len = 0;
1089         ei->i_da_metadata_calc_last_lblock = 0;
1090         spin_lock_init(&(ei->i_block_reservation_lock));
1091         ext4_init_pending_tree(&ei->i_pending_tree);
1092 #ifdef CONFIG_QUOTA
1093         ei->i_reserved_quota = 0;
1094         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
1095 #endif
1096         ei->jinode = NULL;
1097         INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
1098         spin_lock_init(&ei->i_completed_io_lock);
1099         ei->i_sync_tid = 0;
1100         ei->i_datasync_tid = 0;
1101         atomic_set(&ei->i_unwritten, 0);
1102         INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
1103         return &ei->vfs_inode;
1104 }
1105
1106 static int ext4_drop_inode(struct inode *inode)
1107 {
1108         int drop = generic_drop_inode(inode);
1109
1110         if (!drop)
1111                 drop = fscrypt_drop_inode(inode);
1112
1113         trace_ext4_drop_inode(inode, drop);
1114         return drop;
1115 }
1116
1117 static void ext4_free_in_core_inode(struct inode *inode)
1118 {
1119         fscrypt_free_inode(inode);
1120         kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1121 }
1122
1123 static void ext4_destroy_inode(struct inode *inode)
1124 {
1125         if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
1126                 ext4_msg(inode->i_sb, KERN_ERR,
1127                          "Inode %lu (%p): orphan list check failed!",
1128                          inode->i_ino, EXT4_I(inode));
1129                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1130                                 EXT4_I(inode), sizeof(struct ext4_inode_info),
1131                                 true);
1132                 dump_stack();
1133         }
1134 }
1135
1136 static void init_once(void *foo)
1137 {
1138         struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
1139
1140         INIT_LIST_HEAD(&ei->i_orphan);
1141         init_rwsem(&ei->xattr_sem);
1142         init_rwsem(&ei->i_data_sem);
1143         init_rwsem(&ei->i_mmap_sem);
1144         inode_init_once(&ei->vfs_inode);
1145 }
1146
1147 static int __init init_inodecache(void)
1148 {
1149         ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1150                                 sizeof(struct ext4_inode_info), 0,
1151                                 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1152                                         SLAB_ACCOUNT),
1153                                 offsetof(struct ext4_inode_info, i_data),
1154                                 sizeof_field(struct ext4_inode_info, i_data),
1155                                 init_once);
1156         if (ext4_inode_cachep == NULL)
1157                 return -ENOMEM;
1158         return 0;
1159 }
1160
1161 static void destroy_inodecache(void)
1162 {
1163         /*
1164          * Make sure all delayed rcu free inodes are flushed before we
1165          * destroy cache.
1166          */
1167         rcu_barrier();
1168         kmem_cache_destroy(ext4_inode_cachep);
1169 }
1170
1171 void ext4_clear_inode(struct inode *inode)
1172 {
1173         invalidate_inode_buffers(inode);
1174         clear_inode(inode);
1175         dquot_drop(inode);
1176         ext4_discard_preallocations(inode);
1177         ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1178         if (EXT4_I(inode)->jinode) {
1179                 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1180                                                EXT4_I(inode)->jinode);
1181                 jbd2_free_inode(EXT4_I(inode)->jinode);
1182                 EXT4_I(inode)->jinode = NULL;
1183         }
1184         fscrypt_put_encryption_info(inode);
1185         fsverity_cleanup_inode(inode);
1186 }
1187
1188 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1189                                         u64 ino, u32 generation)
1190 {
1191         struct inode *inode;
1192
1193         /*
1194          * Currently we don't know the generation for parent directory, so
1195          * a generation of 0 means "accept any"
1196          */
1197         inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1198         if (IS_ERR(inode))
1199                 return ERR_CAST(inode);
1200         if (generation && inode->i_generation != generation) {
1201                 iput(inode);
1202                 return ERR_PTR(-ESTALE);
1203         }
1204
1205         return inode;
1206 }
1207
1208 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1209                                         int fh_len, int fh_type)
1210 {
1211         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1212                                     ext4_nfs_get_inode);
1213 }
1214
1215 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1216                                         int fh_len, int fh_type)
1217 {
1218         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1219                                     ext4_nfs_get_inode);
1220 }
1221
1222 static int ext4_nfs_commit_metadata(struct inode *inode)
1223 {
1224         struct writeback_control wbc = {
1225                 .sync_mode = WB_SYNC_ALL
1226         };
1227
1228         trace_ext4_nfs_commit_metadata(inode);
1229         return ext4_write_inode(inode, &wbc);
1230 }
1231
1232 /*
1233  * Try to release metadata pages (indirect blocks, directories) which are
1234  * mapped via the block device.  Since these pages could have journal heads
1235  * which would prevent try_to_free_buffers() from freeing them, we must use
1236  * jbd2 layer's try_to_free_buffers() function to release them.
1237  */
1238 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1239                                  gfp_t wait)
1240 {
1241         journal_t *journal = EXT4_SB(sb)->s_journal;
1242
1243         WARN_ON(PageChecked(page));
1244         if (!page_has_buffers(page))
1245                 return 0;
1246         if (journal)
1247                 return jbd2_journal_try_to_free_buffers(journal, page,
1248                                                 wait & ~__GFP_DIRECT_RECLAIM);
1249         return try_to_free_buffers(page);
1250 }
1251
1252 #ifdef CONFIG_FS_ENCRYPTION
1253 static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1254 {
1255         return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1256                                  EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1257 }
1258
1259 static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1260                                                         void *fs_data)
1261 {
1262         handle_t *handle = fs_data;
1263         int res, res2, credits, retries = 0;
1264
1265         /*
1266          * Encrypting the root directory is not allowed because e2fsck expects
1267          * lost+found to exist and be unencrypted, and encrypting the root
1268          * directory would imply encrypting the lost+found directory as well as
1269          * the filename "lost+found" itself.
1270          */
1271         if (inode->i_ino == EXT4_ROOT_INO)
1272                 return -EPERM;
1273
1274         if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1275                 return -EINVAL;
1276
1277         res = ext4_convert_inline_data(inode);
1278         if (res)
1279                 return res;
1280
1281         /*
1282          * If a journal handle was specified, then the encryption context is
1283          * being set on a new inode via inheritance and is part of a larger
1284          * transaction to create the inode.  Otherwise the encryption context is
1285          * being set on an existing inode in its own transaction.  Only in the
1286          * latter case should the "retry on ENOSPC" logic be used.
1287          */
1288
1289         if (handle) {
1290                 res = ext4_xattr_set_handle(handle, inode,
1291                                             EXT4_XATTR_INDEX_ENCRYPTION,
1292                                             EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1293                                             ctx, len, 0);
1294                 if (!res) {
1295                         ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1296                         ext4_clear_inode_state(inode,
1297                                         EXT4_STATE_MAY_INLINE_DATA);
1298                         /*
1299                          * Update inode->i_flags - S_ENCRYPTED will be enabled,
1300                          * S_DAX may be disabled
1301                          */
1302                         ext4_set_inode_flags(inode);
1303                 }
1304                 return res;
1305         }
1306
1307         res = dquot_initialize(inode);
1308         if (res)
1309                 return res;
1310 retry:
1311         res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1312                                      &credits);
1313         if (res)
1314                 return res;
1315
1316         handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
1317         if (IS_ERR(handle))
1318                 return PTR_ERR(handle);
1319
1320         res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1321                                     EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1322                                     ctx, len, 0);
1323         if (!res) {
1324                 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1325                 /*
1326                  * Update inode->i_flags - S_ENCRYPTED will be enabled,
1327                  * S_DAX may be disabled
1328                  */
1329                 ext4_set_inode_flags(inode);
1330                 res = ext4_mark_inode_dirty(handle, inode);
1331                 if (res)
1332                         EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1333         }
1334         res2 = ext4_journal_stop(handle);
1335
1336         if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1337                 goto retry;
1338         if (!res)
1339                 res = res2;
1340         return res;
1341 }
1342
1343 static bool ext4_dummy_context(struct inode *inode)
1344 {
1345         return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1346 }
1347
1348 static const struct fscrypt_operations ext4_cryptops = {
1349         .key_prefix             = "ext4:",
1350         .get_context            = ext4_get_context,
1351         .set_context            = ext4_set_context,
1352         .dummy_context          = ext4_dummy_context,
1353         .empty_dir              = ext4_empty_dir,
1354         .max_namelen            = EXT4_NAME_LEN,
1355 };
1356 #endif
1357
1358 #ifdef CONFIG_QUOTA
1359 static const char * const quotatypes[] = INITQFNAMES;
1360 #define QTYPE2NAME(t) (quotatypes[t])
1361
1362 static int ext4_write_dquot(struct dquot *dquot);
1363 static int ext4_acquire_dquot(struct dquot *dquot);
1364 static int ext4_release_dquot(struct dquot *dquot);
1365 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1366 static int ext4_write_info(struct super_block *sb, int type);
1367 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1368                          const struct path *path);
1369 static int ext4_quota_on_mount(struct super_block *sb, int type);
1370 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1371                                size_t len, loff_t off);
1372 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1373                                 const char *data, size_t len, loff_t off);
1374 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1375                              unsigned int flags);
1376 static int ext4_enable_quotas(struct super_block *sb);
1377 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
1378
1379 static struct dquot **ext4_get_dquots(struct inode *inode)
1380 {
1381         return EXT4_I(inode)->i_dquot;
1382 }
1383
1384 static const struct dquot_operations ext4_quota_operations = {
1385         .get_reserved_space     = ext4_get_reserved_space,
1386         .write_dquot            = ext4_write_dquot,
1387         .acquire_dquot          = ext4_acquire_dquot,
1388         .release_dquot          = ext4_release_dquot,
1389         .mark_dirty             = ext4_mark_dquot_dirty,
1390         .write_info             = ext4_write_info,
1391         .alloc_dquot            = dquot_alloc,
1392         .destroy_dquot          = dquot_destroy,
1393         .get_projid             = ext4_get_projid,
1394         .get_inode_usage        = ext4_get_inode_usage,
1395         .get_next_id            = ext4_get_next_id,
1396 };
1397
1398 static const struct quotactl_ops ext4_qctl_operations = {
1399         .quota_on       = ext4_quota_on,
1400         .quota_off      = ext4_quota_off,
1401         .quota_sync     = dquot_quota_sync,
1402         .get_state      = dquot_get_state,
1403         .set_info       = dquot_set_dqinfo,
1404         .get_dqblk      = dquot_get_dqblk,
1405         .set_dqblk      = dquot_set_dqblk,
1406         .get_nextdqblk  = dquot_get_next_dqblk,
1407 };
1408 #endif
1409
1410 static const struct super_operations ext4_sops = {
1411         .alloc_inode    = ext4_alloc_inode,
1412         .free_inode     = ext4_free_in_core_inode,
1413         .destroy_inode  = ext4_destroy_inode,
1414         .write_inode    = ext4_write_inode,
1415         .dirty_inode    = ext4_dirty_inode,
1416         .drop_inode     = ext4_drop_inode,
1417         .evict_inode    = ext4_evict_inode,
1418         .put_super      = ext4_put_super,
1419         .sync_fs        = ext4_sync_fs,
1420         .freeze_fs      = ext4_freeze,
1421         .unfreeze_fs    = ext4_unfreeze,
1422         .statfs         = ext4_statfs,
1423         .remount_fs     = ext4_remount,
1424         .show_options   = ext4_show_options,
1425 #ifdef CONFIG_QUOTA
1426         .quota_read     = ext4_quota_read,
1427         .quota_write    = ext4_quota_write,
1428         .get_dquots     = ext4_get_dquots,
1429 #endif
1430         .bdev_try_to_free_page = bdev_try_to_free_page,
1431 };
1432
1433 static const struct export_operations ext4_export_ops = {
1434         .fh_to_dentry = ext4_fh_to_dentry,
1435         .fh_to_parent = ext4_fh_to_parent,
1436         .get_parent = ext4_get_parent,
1437         .commit_metadata = ext4_nfs_commit_metadata,
1438 };
1439
1440 enum {
1441         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1442         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1443         Opt_nouid32, Opt_debug, Opt_removed,
1444         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1445         Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1446         Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1447         Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1448         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1449         Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1450         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1451         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1452         Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1453         Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1454         Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1455         Opt_nowarn_on_error, Opt_mblk_io_submit,
1456         Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1457         Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1458         Opt_inode_readahead_blks, Opt_journal_ioprio,
1459         Opt_dioread_nolock, Opt_dioread_lock,
1460         Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1461         Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
1462 };
1463
1464 static const match_table_t tokens = {
1465         {Opt_bsd_df, "bsddf"},
1466         {Opt_minix_df, "minixdf"},
1467         {Opt_grpid, "grpid"},
1468         {Opt_grpid, "bsdgroups"},
1469         {Opt_nogrpid, "nogrpid"},
1470         {Opt_nogrpid, "sysvgroups"},
1471         {Opt_resgid, "resgid=%u"},
1472         {Opt_resuid, "resuid=%u"},
1473         {Opt_sb, "sb=%u"},
1474         {Opt_err_cont, "errors=continue"},
1475         {Opt_err_panic, "errors=panic"},
1476         {Opt_err_ro, "errors=remount-ro"},
1477         {Opt_nouid32, "nouid32"},
1478         {Opt_debug, "debug"},
1479         {Opt_removed, "oldalloc"},
1480         {Opt_removed, "orlov"},
1481         {Opt_user_xattr, "user_xattr"},
1482         {Opt_nouser_xattr, "nouser_xattr"},
1483         {Opt_acl, "acl"},
1484         {Opt_noacl, "noacl"},
1485         {Opt_noload, "norecovery"},
1486         {Opt_noload, "noload"},
1487         {Opt_removed, "nobh"},
1488         {Opt_removed, "bh"},
1489         {Opt_commit, "commit=%u"},
1490         {Opt_min_batch_time, "min_batch_time=%u"},
1491         {Opt_max_batch_time, "max_batch_time=%u"},
1492         {Opt_journal_dev, "journal_dev=%u"},
1493         {Opt_journal_path, "journal_path=%s"},
1494         {Opt_journal_checksum, "journal_checksum"},
1495         {Opt_nojournal_checksum, "nojournal_checksum"},
1496         {Opt_journal_async_commit, "journal_async_commit"},
1497         {Opt_abort, "abort"},
1498         {Opt_data_journal, "data=journal"},
1499         {Opt_data_ordered, "data=ordered"},
1500         {Opt_data_writeback, "data=writeback"},
1501         {Opt_data_err_abort, "data_err=abort"},
1502         {Opt_data_err_ignore, "data_err=ignore"},
1503         {Opt_offusrjquota, "usrjquota="},
1504         {Opt_usrjquota, "usrjquota=%s"},
1505         {Opt_offgrpjquota, "grpjquota="},
1506         {Opt_grpjquota, "grpjquota=%s"},
1507         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1508         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1509         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1510         {Opt_grpquota, "grpquota"},
1511         {Opt_noquota, "noquota"},
1512         {Opt_quota, "quota"},
1513         {Opt_usrquota, "usrquota"},
1514         {Opt_prjquota, "prjquota"},
1515         {Opt_barrier, "barrier=%u"},
1516         {Opt_barrier, "barrier"},
1517         {Opt_nobarrier, "nobarrier"},
1518         {Opt_i_version, "i_version"},
1519         {Opt_dax, "dax"},
1520         {Opt_stripe, "stripe=%u"},
1521         {Opt_delalloc, "delalloc"},
1522         {Opt_warn_on_error, "warn_on_error"},
1523         {Opt_nowarn_on_error, "nowarn_on_error"},
1524         {Opt_lazytime, "lazytime"},
1525         {Opt_nolazytime, "nolazytime"},
1526         {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
1527         {Opt_nodelalloc, "nodelalloc"},
1528         {Opt_removed, "mblk_io_submit"},
1529         {Opt_removed, "nomblk_io_submit"},
1530         {Opt_block_validity, "block_validity"},
1531         {Opt_noblock_validity, "noblock_validity"},
1532         {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1533         {Opt_journal_ioprio, "journal_ioprio=%u"},
1534         {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1535         {Opt_auto_da_alloc, "auto_da_alloc"},
1536         {Opt_noauto_da_alloc, "noauto_da_alloc"},
1537         {Opt_dioread_nolock, "dioread_nolock"},
1538         {Opt_dioread_lock, "dioread_lock"},
1539         {Opt_discard, "discard"},
1540         {Opt_nodiscard, "nodiscard"},
1541         {Opt_init_itable, "init_itable=%u"},
1542         {Opt_init_itable, "init_itable"},
1543         {Opt_noinit_itable, "noinit_itable"},
1544         {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1545         {Opt_test_dummy_encryption, "test_dummy_encryption"},
1546         {Opt_nombcache, "nombcache"},
1547         {Opt_nombcache, "no_mbcache"},  /* for backward compatibility */
1548         {Opt_removed, "check=none"},    /* mount option from ext2/3 */
1549         {Opt_removed, "nocheck"},       /* mount option from ext2/3 */
1550         {Opt_removed, "reservation"},   /* mount option from ext2/3 */
1551         {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1552         {Opt_removed, "journal=%u"},    /* mount option from ext2/3 */
1553         {Opt_err, NULL},
1554 };
1555
1556 static ext4_fsblk_t get_sb_block(void **data)
1557 {
1558         ext4_fsblk_t    sb_block;
1559         char            *options = (char *) *data;
1560
1561         if (!options || strncmp(options, "sb=", 3) != 0)
1562                 return 1;       /* Default location */
1563
1564         options += 3;
1565         /* TODO: use simple_strtoll with >32bit ext4 */
1566         sb_block = simple_strtoul(options, &options, 0);
1567         if (*options && *options != ',') {
1568                 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1569                        (char *) *data);
1570                 return 1;
1571         }
1572         if (*options == ',')
1573                 options++;
1574         *data = (void *) options;
1575
1576         return sb_block;
1577 }
1578
1579 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1580 static const char deprecated_msg[] =
1581         "Mount option \"%s\" will be removed by %s\n"
1582         "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1583
1584 #ifdef CONFIG_QUOTA
1585 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1586 {
1587         struct ext4_sb_info *sbi = EXT4_SB(sb);
1588         char *qname, *old_qname = get_qf_name(sb, sbi, qtype);
1589         int ret = -1;
1590
1591         if (sb_any_quota_loaded(sb) && !old_qname) {
1592                 ext4_msg(sb, KERN_ERR,
1593                         "Cannot change journaled "
1594                         "quota options when quota turned on");
1595                 return -1;
1596         }
1597         if (ext4_has_feature_quota(sb)) {
1598                 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1599                          "ignored when QUOTA feature is enabled");
1600                 return 1;
1601         }
1602         qname = match_strdup(args);
1603         if (!qname) {
1604                 ext4_msg(sb, KERN_ERR,
1605                         "Not enough memory for storing quotafile name");
1606                 return -1;
1607         }
1608         if (old_qname) {
1609                 if (strcmp(old_qname, qname) == 0)
1610                         ret = 1;
1611                 else
1612                         ext4_msg(sb, KERN_ERR,
1613                                  "%s quota file already specified",
1614                                  QTYPE2NAME(qtype));
1615                 goto errout;
1616         }
1617         if (strchr(qname, '/')) {
1618                 ext4_msg(sb, KERN_ERR,
1619                         "quotafile must be on filesystem root");
1620                 goto errout;
1621         }
1622         rcu_assign_pointer(sbi->s_qf_names[qtype], qname);
1623         set_opt(sb, QUOTA);
1624         return 1;
1625 errout:
1626         kfree(qname);
1627         return ret;
1628 }
1629
1630 static int clear_qf_name(struct super_block *sb, int qtype)
1631 {
1632
1633         struct ext4_sb_info *sbi = EXT4_SB(sb);
1634         char *old_qname = get_qf_name(sb, sbi, qtype);
1635
1636         if (sb_any_quota_loaded(sb) && old_qname) {
1637                 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1638                         " when quota turned on");
1639                 return -1;
1640         }
1641         rcu_assign_pointer(sbi->s_qf_names[qtype], NULL);
1642         synchronize_rcu();
1643         kfree(old_qname);
1644         return 1;
1645 }
1646 #endif
1647
1648 #define MOPT_SET        0x0001
1649 #define MOPT_CLEAR      0x0002
1650 #define MOPT_NOSUPPORT  0x0004
1651 #define MOPT_EXPLICIT   0x0008
1652 #define MOPT_CLEAR_ERR  0x0010
1653 #define MOPT_GTE0       0x0020
1654 #ifdef CONFIG_QUOTA
1655 #define MOPT_Q          0
1656 #define MOPT_QFMT       0x0040
1657 #else
1658 #define MOPT_Q          MOPT_NOSUPPORT
1659 #define MOPT_QFMT       MOPT_NOSUPPORT
1660 #endif
1661 #define MOPT_DATAJ      0x0080
1662 #define MOPT_NO_EXT2    0x0100
1663 #define MOPT_NO_EXT3    0x0200
1664 #define MOPT_EXT4_ONLY  (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1665 #define MOPT_STRING     0x0400
1666
1667 static const struct mount_opts {
1668         int     token;
1669         int     mount_opt;
1670         int     flags;
1671 } ext4_mount_opts[] = {
1672         {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1673         {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1674         {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1675         {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1676         {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1677         {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1678         {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1679          MOPT_EXT4_ONLY | MOPT_SET},
1680         {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1681          MOPT_EXT4_ONLY | MOPT_CLEAR},
1682         {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1683         {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1684         {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1685          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1686         {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1687          MOPT_EXT4_ONLY | MOPT_CLEAR},
1688         {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1689         {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
1690         {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1691          MOPT_EXT4_ONLY | MOPT_CLEAR},
1692         {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1693          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1694         {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1695                                     EXT4_MOUNT_JOURNAL_CHECKSUM),
1696          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1697         {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1698         {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1699         {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1700         {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1701         {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1702          MOPT_NO_EXT2},
1703         {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1704          MOPT_NO_EXT2},
1705         {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1706         {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1707         {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1708         {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1709         {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1710         {Opt_commit, 0, MOPT_GTE0},
1711         {Opt_max_batch_time, 0, MOPT_GTE0},
1712         {Opt_min_batch_time, 0, MOPT_GTE0},
1713         {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1714         {Opt_init_itable, 0, MOPT_GTE0},
1715         {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1716         {Opt_stripe, 0, MOPT_GTE0},
1717         {Opt_resuid, 0, MOPT_GTE0},
1718         {Opt_resgid, 0, MOPT_GTE0},
1719         {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1720         {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1721         {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1722         {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1723         {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1724         {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1725          MOPT_NO_EXT2 | MOPT_DATAJ},
1726         {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1727         {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1728 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1729         {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1730         {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1731 #else
1732         {Opt_acl, 0, MOPT_NOSUPPORT},
1733         {Opt_noacl, 0, MOPT_NOSUPPORT},
1734 #endif
1735         {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1736         {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1737         {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
1738         {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1739         {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1740                                                         MOPT_SET | MOPT_Q},
1741         {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1742                                                         MOPT_SET | MOPT_Q},
1743         {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1744                                                         MOPT_SET | MOPT_Q},
1745         {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1746                        EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1747                                                         MOPT_CLEAR | MOPT_Q},
1748         {Opt_usrjquota, 0, MOPT_Q},
1749         {Opt_grpjquota, 0, MOPT_Q},
1750         {Opt_offusrjquota, 0, MOPT_Q},
1751         {Opt_offgrpjquota, 0, MOPT_Q},
1752         {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1753         {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1754         {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1755         {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1756         {Opt_test_dummy_encryption, 0, MOPT_GTE0},
1757         {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
1758         {Opt_err, 0, 0}
1759 };
1760
1761 #ifdef CONFIG_UNICODE
1762 static const struct ext4_sb_encodings {
1763         __u16 magic;
1764         char *name;
1765         char *version;
1766 } ext4_sb_encoding_map[] = {
1767         {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"},
1768 };
1769
1770 static int ext4_sb_read_encoding(const struct ext4_super_block *es,
1771                                  const struct ext4_sb_encodings **encoding,
1772                                  __u16 *flags)
1773 {
1774         __u16 magic = le16_to_cpu(es->s_encoding);
1775         int i;
1776
1777         for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
1778                 if (magic == ext4_sb_encoding_map[i].magic)
1779                         break;
1780
1781         if (i >= ARRAY_SIZE(ext4_sb_encoding_map))
1782                 return -EINVAL;
1783
1784         *encoding = &ext4_sb_encoding_map[i];
1785         *flags = le16_to_cpu(es->s_encoding_flags);
1786
1787         return 0;
1788 }
1789 #endif
1790
1791 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1792                             substring_t *args, unsigned long *journal_devnum,
1793                             unsigned int *journal_ioprio, int is_remount)
1794 {
1795         struct ext4_sb_info *sbi = EXT4_SB(sb);
1796         const struct mount_opts *m;
1797         kuid_t uid;
1798         kgid_t gid;
1799         int arg = 0;
1800
1801 #ifdef CONFIG_QUOTA
1802         if (token == Opt_usrjquota)
1803                 return set_qf_name(sb, USRQUOTA, &args[0]);
1804         else if (token == Opt_grpjquota)
1805                 return set_qf_name(sb, GRPQUOTA, &args[0]);
1806         else if (token == Opt_offusrjquota)
1807                 return clear_qf_name(sb, USRQUOTA);
1808         else if (token == Opt_offgrpjquota)
1809                 return clear_qf_name(sb, GRPQUOTA);
1810 #endif
1811         switch (token) {
1812         case Opt_noacl:
1813         case Opt_nouser_xattr:
1814                 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1815                 break;
1816         case Opt_sb:
1817                 return 1;       /* handled by get_sb_block() */
1818         case Opt_removed:
1819                 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1820                 return 1;
1821         case Opt_abort:
1822                 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1823                 return 1;
1824         case Opt_i_version:
1825                 sb->s_flags |= SB_I_VERSION;
1826                 return 1;
1827         case Opt_lazytime:
1828                 sb->s_flags |= SB_LAZYTIME;
1829                 return 1;
1830         case Opt_nolazytime:
1831                 sb->s_flags &= ~SB_LAZYTIME;
1832                 return 1;
1833         }
1834
1835         for (m = ext4_mount_opts; m->token != Opt_err; m++)
1836                 if (token == m->token)
1837                         break;
1838
1839         if (m->token == Opt_err) {
1840                 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1841                          "or missing value", opt);
1842                 return -1;
1843         }
1844
1845         if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1846                 ext4_msg(sb, KERN_ERR,
1847                          "Mount option \"%s\" incompatible with ext2", opt);
1848                 return -1;
1849         }
1850         if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1851                 ext4_msg(sb, KERN_ERR,
1852                          "Mount option \"%s\" incompatible with ext3", opt);
1853                 return -1;
1854         }
1855
1856         if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1857                 return -1;
1858         if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1859                 return -1;
1860         if (m->flags & MOPT_EXPLICIT) {
1861                 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1862                         set_opt2(sb, EXPLICIT_DELALLOC);
1863                 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1864                         set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
1865                 } else
1866                         return -1;
1867         }
1868         if (m->flags & MOPT_CLEAR_ERR)
1869                 clear_opt(sb, ERRORS_MASK);
1870         if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1871                 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1872                          "options when quota turned on");
1873                 return -1;
1874         }
1875
1876         if (m->flags & MOPT_NOSUPPORT) {
1877                 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1878         } else if (token == Opt_commit) {
1879                 if (arg == 0)
1880                         arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1881                 else if (arg > INT_MAX / HZ) {
1882                         ext4_msg(sb, KERN_ERR,
1883                                  "Invalid commit interval %d, "
1884                                  "must be smaller than %d",
1885                                  arg, INT_MAX / HZ);
1886                         return -1;
1887                 }
1888                 sbi->s_commit_interval = HZ * arg;
1889         } else if (token == Opt_debug_want_extra_isize) {
1890                 sbi->s_want_extra_isize = arg;
1891         } else if (token == Opt_max_batch_time) {
1892                 sbi->s_max_batch_time = arg;
1893         } else if (token == Opt_min_batch_time) {
1894                 sbi->s_min_batch_time = arg;
1895         } else if (token == Opt_inode_readahead_blks) {
1896                 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1897                         ext4_msg(sb, KERN_ERR,
1898                                  "EXT4-fs: inode_readahead_blks must be "
1899                                  "0 or a power of 2 smaller than 2^31");
1900                         return -1;
1901                 }
1902                 sbi->s_inode_readahead_blks = arg;
1903         } else if (token == Opt_init_itable) {
1904                 set_opt(sb, INIT_INODE_TABLE);
1905                 if (!args->from)
1906                         arg = EXT4_DEF_LI_WAIT_MULT;
1907                 sbi->s_li_wait_mult = arg;
1908         } else if (token == Opt_max_dir_size_kb) {
1909                 sbi->s_max_dir_size_kb = arg;
1910         } else if (token == Opt_stripe) {
1911                 sbi->s_stripe = arg;
1912         } else if (token == Opt_resuid) {
1913                 uid = make_kuid(current_user_ns(), arg);
1914                 if (!uid_valid(uid)) {
1915                         ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1916                         return -1;
1917                 }
1918                 sbi->s_resuid = uid;
1919         } else if (token == Opt_resgid) {
1920                 gid = make_kgid(current_user_ns(), arg);
1921                 if (!gid_valid(gid)) {
1922                         ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1923                         return -1;
1924                 }
1925                 sbi->s_resgid = gid;
1926         } else if (token == Opt_journal_dev) {
1927                 if (is_remount) {
1928                         ext4_msg(sb, KERN_ERR,
1929                                  "Cannot specify journal on remount");
1930                         return -1;
1931                 }
1932                 *journal_devnum = arg;
1933         } else if (token == Opt_journal_path) {
1934                 char *journal_path;
1935                 struct inode *journal_inode;
1936                 struct path path;
1937                 int error;
1938
1939                 if (is_remount) {
1940                         ext4_msg(sb, KERN_ERR,
1941                                  "Cannot specify journal on remount");
1942                         return -1;
1943                 }
1944                 journal_path = match_strdup(&args[0]);
1945                 if (!journal_path) {
1946                         ext4_msg(sb, KERN_ERR, "error: could not dup "
1947                                 "journal device string");
1948                         return -1;
1949                 }
1950
1951                 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1952                 if (error) {
1953                         ext4_msg(sb, KERN_ERR, "error: could not find "
1954                                 "journal device path: error %d", error);
1955                         kfree(journal_path);
1956                         return -1;
1957                 }
1958
1959                 journal_inode = d_inode(path.dentry);
1960                 if (!S_ISBLK(journal_inode->i_mode)) {
1961                         ext4_msg(sb, KERN_ERR, "error: journal path %s "
1962                                 "is not a block device", journal_path);
1963                         path_put(&path);
1964                         kfree(journal_path);
1965                         return -1;
1966                 }
1967
1968                 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1969                 path_put(&path);
1970                 kfree(journal_path);
1971         } else if (token == Opt_journal_ioprio) {
1972                 if (arg > 7) {
1973                         ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1974                                  " (must be 0-7)");
1975                         return -1;
1976                 }
1977                 *journal_ioprio =
1978                         IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1979         } else if (token == Opt_test_dummy_encryption) {
1980 #ifdef CONFIG_FS_ENCRYPTION
1981                 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1982                 ext4_msg(sb, KERN_WARNING,
1983                          "Test dummy encryption mode enabled");
1984 #else
1985                 ext4_msg(sb, KERN_WARNING,
1986                          "Test dummy encryption mount option ignored");
1987 #endif
1988         } else if (m->flags & MOPT_DATAJ) {
1989                 if (is_remount) {
1990                         if (!sbi->s_journal)
1991                                 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1992                         else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
1993                                 ext4_msg(sb, KERN_ERR,
1994                                          "Cannot change data mode on remount");
1995                                 return -1;
1996                         }
1997                 } else {
1998                         clear_opt(sb, DATA_FLAGS);
1999                         sbi->s_mount_opt |= m->mount_opt;
2000                 }
2001 #ifdef CONFIG_QUOTA
2002         } else if (m->flags & MOPT_QFMT) {
2003                 if (sb_any_quota_loaded(sb) &&
2004                     sbi->s_jquota_fmt != m->mount_opt) {
2005                         ext4_msg(sb, KERN_ERR, "Cannot change journaled "
2006                                  "quota options when quota turned on");
2007                         return -1;
2008                 }
2009                 if (ext4_has_feature_quota(sb)) {
2010                         ext4_msg(sb, KERN_INFO,
2011                                  "Quota format mount options ignored "
2012                                  "when QUOTA feature is enabled");
2013                         return 1;
2014                 }
2015                 sbi->s_jquota_fmt = m->mount_opt;
2016 #endif
2017         } else if (token == Opt_dax) {
2018 #ifdef CONFIG_FS_DAX
2019                 ext4_msg(sb, KERN_WARNING,
2020                 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
2021                 sbi->s_mount_opt |= m->mount_opt;
2022 #else
2023                 ext4_msg(sb, KERN_INFO, "dax option not supported");
2024                 return -1;
2025 #endif
2026         } else if (token == Opt_data_err_abort) {
2027                 sbi->s_mount_opt |= m->mount_opt;
2028         } else if (token == Opt_data_err_ignore) {
2029                 sbi->s_mount_opt &= ~m->mount_opt;
2030         } else {
2031                 if (!args->from)
2032                         arg = 1;
2033                 if (m->flags & MOPT_CLEAR)
2034                         arg = !arg;
2035                 else if (unlikely(!(m->flags & MOPT_SET))) {
2036                         ext4_msg(sb, KERN_WARNING,
2037                                  "buggy handling of option %s", opt);
2038                         WARN_ON(1);
2039                         return -1;
2040                 }
2041                 if (arg != 0)
2042                         sbi->s_mount_opt |= m->mount_opt;
2043                 else
2044                         sbi->s_mount_opt &= ~m->mount_opt;
2045         }
2046         return 1;
2047 }
2048
2049 static int parse_options(char *options, struct super_block *sb,
2050                          unsigned long *journal_devnum,
2051                          unsigned int *journal_ioprio,
2052                          int is_remount)
2053 {
2054         struct ext4_sb_info *sbi = EXT4_SB(sb);
2055         char *p, __maybe_unused *usr_qf_name, __maybe_unused *grp_qf_name;
2056         substring_t args[MAX_OPT_ARGS];
2057         int token;
2058
2059         if (!options)
2060                 return 1;
2061
2062         while ((p = strsep(&options, ",")) != NULL) {
2063                 if (!*p)
2064                         continue;
2065                 /*
2066                  * Initialize args struct so we know whether arg was
2067                  * found; some options take optional arguments.
2068                  */
2069                 args[0].to = args[0].from = NULL;
2070                 token = match_token(p, tokens, args);
2071                 if (handle_mount_opt(sb, p, token, args, journal_devnum,
2072                                      journal_ioprio, is_remount) < 0)
2073                         return 0;
2074         }
2075 #ifdef CONFIG_QUOTA
2076         /*
2077          * We do the test below only for project quotas. 'usrquota' and
2078          * 'grpquota' mount options are allowed even without quota feature
2079          * to support legacy quotas in quota files.
2080          */
2081         if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
2082                 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
2083                          "Cannot enable project quota enforcement.");
2084                 return 0;
2085         }
2086         usr_qf_name = get_qf_name(sb, sbi, USRQUOTA);
2087         grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA);
2088         if (usr_qf_name || grp_qf_name) {
2089                 if (test_opt(sb, USRQUOTA) && usr_qf_name)
2090                         clear_opt(sb, USRQUOTA);
2091
2092                 if (test_opt(sb, GRPQUOTA) && grp_qf_name)
2093                         clear_opt(sb, GRPQUOTA);
2094
2095                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
2096                         ext4_msg(sb, KERN_ERR, "old and new quota "
2097                                         "format mixing");
2098                         return 0;
2099                 }
2100
2101                 if (!sbi->s_jquota_fmt) {
2102                         ext4_msg(sb, KERN_ERR, "journaled quota format "
2103                                         "not specified");
2104                         return 0;
2105                 }
2106         }
2107 #endif
2108         if (test_opt(sb, DIOREAD_NOLOCK)) {
2109                 int blocksize =
2110                         BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2111
2112                 if (blocksize < PAGE_SIZE) {
2113                         ext4_msg(sb, KERN_ERR, "can't mount with "
2114                                  "dioread_nolock if block size != PAGE_SIZE");
2115                         return 0;
2116                 }
2117         }
2118         return 1;
2119 }
2120
2121 static inline void ext4_show_quota_options(struct seq_file *seq,
2122                                            struct super_block *sb)
2123 {
2124 #if defined(CONFIG_QUOTA)
2125         struct ext4_sb_info *sbi = EXT4_SB(sb);
2126         char *usr_qf_name, *grp_qf_name;
2127
2128         if (sbi->s_jquota_fmt) {
2129                 char *fmtname = "";
2130
2131                 switch (sbi->s_jquota_fmt) {
2132                 case QFMT_VFS_OLD:
2133                         fmtname = "vfsold";
2134                         break;
2135                 case QFMT_VFS_V0:
2136                         fmtname = "vfsv0";
2137                         break;
2138                 case QFMT_VFS_V1:
2139                         fmtname = "vfsv1";
2140                         break;
2141                 }
2142                 seq_printf(seq, ",jqfmt=%s", fmtname);
2143         }
2144
2145         rcu_read_lock();
2146         usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2147         grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2148         if (usr_qf_name)
2149                 seq_show_option(seq, "usrjquota", usr_qf_name);
2150         if (grp_qf_name)
2151                 seq_show_option(seq, "grpjquota", grp_qf_name);
2152         rcu_read_unlock();
2153 #endif
2154 }
2155
2156 static const char *token2str(int token)
2157 {
2158         const struct match_token *t;
2159
2160         for (t = tokens; t->token != Opt_err; t++)
2161                 if (t->token == token && !strchr(t->pattern, '='))
2162                         break;
2163         return t->pattern;
2164 }
2165
2166 /*
2167  * Show an option if
2168  *  - it's set to a non-default value OR
2169  *  - if the per-sb default is different from the global default
2170  */
2171 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2172                               int nodefs)
2173 {
2174         struct ext4_sb_info *sbi = EXT4_SB(sb);
2175         struct ext4_super_block *es = sbi->s_es;
2176         int def_errors, def_mount_opt = sbi->s_def_mount_opt;
2177         const struct mount_opts *m;
2178         char sep = nodefs ? '\n' : ',';
2179
2180 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2181 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2182
2183         if (sbi->s_sb_block != 1)
2184                 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2185
2186         for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2187                 int want_set = m->flags & MOPT_SET;
2188                 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2189                     (m->flags & MOPT_CLEAR_ERR))
2190                         continue;
2191                 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
2192                         continue; /* skip if same as the default */
2193                 if ((want_set &&
2194                      (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2195                     (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2196                         continue; /* select Opt_noFoo vs Opt_Foo */
2197                 SEQ_OPTS_PRINT("%s", token2str(m->token));
2198         }
2199
2200         if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
2201             le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
2202                 SEQ_OPTS_PRINT("resuid=%u",
2203                                 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2204         if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
2205             le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
2206                 SEQ_OPTS_PRINT("resgid=%u",
2207                                 from_kgid_munged(&init_user_ns, sbi->s_resgid));
2208         def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
2209         if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2210                 SEQ_OPTS_PUTS("errors=remount-ro");
2211         if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
2212                 SEQ_OPTS_PUTS("errors=continue");
2213         if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
2214                 SEQ_OPTS_PUTS("errors=panic");
2215         if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
2216                 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
2217         if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
2218                 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
2219         if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
2220                 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2221         if (sb->s_flags & SB_I_VERSION)
2222                 SEQ_OPTS_PUTS("i_version");
2223         if (nodefs || sbi->s_stripe)
2224                 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
2225         if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2226                         (sbi->s_mount_opt ^ def_mount_opt)) {
2227                 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2228                         SEQ_OPTS_PUTS("data=journal");
2229                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2230                         SEQ_OPTS_PUTS("data=ordered");
2231                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2232                         SEQ_OPTS_PUTS("data=writeback");
2233         }
2234         if (nodefs ||
2235             sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
2236                 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2237                                sbi->s_inode_readahead_blks);
2238
2239         if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
2240                        (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
2241                 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2242         if (nodefs || sbi->s_max_dir_size_kb)
2243                 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2244         if (test_opt(sb, DATA_ERR_ABORT))
2245                 SEQ_OPTS_PUTS("data_err=abort");
2246         if (DUMMY_ENCRYPTION_ENABLED(sbi))
2247                 SEQ_OPTS_PUTS("test_dummy_encryption");
2248
2249         ext4_show_quota_options(seq, sb);
2250         return 0;
2251 }
2252
2253 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2254 {
2255         return _ext4_show_options(seq, root->d_sb, 0);
2256 }
2257
2258 int ext4_seq_options_show(struct seq_file *seq, void *offset)
2259 {
2260         struct super_block *sb = seq->private;
2261         int rc;
2262
2263         seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
2264         rc = _ext4_show_options(seq, sb, 1);
2265         seq_puts(seq, "\n");
2266         return rc;
2267 }
2268
2269 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
2270                             int read_only)
2271 {
2272         struct ext4_sb_info *sbi = EXT4_SB(sb);
2273         int err = 0;
2274
2275         if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2276                 ext4_msg(sb, KERN_ERR, "revision level too high, "
2277                          "forcing read-only mode");
2278                 err = -EROFS;
2279         }
2280         if (read_only)
2281                 goto done;
2282         if (!(sbi->s_mount_state & EXT4_VALID_FS))
2283                 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2284                          "running e2fsck is recommended");
2285         else if (sbi->s_mount_state & EXT4_ERROR_FS)
2286                 ext4_msg(sb, KERN_WARNING,
2287                          "warning: mounting fs with errors, "
2288                          "running e2fsck is recommended");
2289         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
2290                  le16_to_cpu(es->s_mnt_count) >=
2291                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2292                 ext4_msg(sb, KERN_WARNING,
2293                          "warning: maximal mount count reached, "
2294                          "running e2fsck is recommended");
2295         else if (le32_to_cpu(es->s_checkinterval) &&
2296                  (ext4_get_tstamp(es, s_lastcheck) +
2297                   le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
2298                 ext4_msg(sb, KERN_WARNING,
2299                          "warning: checktime reached, "
2300                          "running e2fsck is recommended");
2301         if (!sbi->s_journal)
2302                 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
2303         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
2304                 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
2305         le16_add_cpu(&es->s_mnt_count, 1);
2306         ext4_update_tstamp(es, s_mtime);
2307         if (sbi->s_journal)
2308                 ext4_set_feature_journal_needs_recovery(sb);
2309
2310         err = ext4_commit_super(sb, 1);
2311 done:
2312         if (test_opt(sb, DEBUG))
2313                 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
2314                                 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2315                         sb->s_blocksize,
2316                         sbi->s_groups_count,
2317                         EXT4_BLOCKS_PER_GROUP(sb),
2318                         EXT4_INODES_PER_GROUP(sb),
2319                         sbi->s_mount_opt, sbi->s_mount_opt2);
2320
2321         cleancache_init_fs(sb);
2322         return err;
2323 }
2324
2325 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2326 {
2327         struct ext4_sb_info *sbi = EXT4_SB(sb);
2328         struct flex_groups *new_groups;
2329         int size;
2330
2331         if (!sbi->s_log_groups_per_flex)
2332                 return 0;
2333
2334         size = ext4_flex_group(sbi, ngroup - 1) + 1;
2335         if (size <= sbi->s_flex_groups_allocated)
2336                 return 0;
2337
2338         size = roundup_pow_of_two(size * sizeof(struct flex_groups));
2339         new_groups = kvzalloc(size, GFP_KERNEL);
2340         if (!new_groups) {
2341                 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2342                          size / (int) sizeof(struct flex_groups));
2343                 return -ENOMEM;
2344         }
2345
2346         if (sbi->s_flex_groups) {
2347                 memcpy(new_groups, sbi->s_flex_groups,
2348                        (sbi->s_flex_groups_allocated *
2349                         sizeof(struct flex_groups)));
2350                 kvfree(sbi->s_flex_groups);
2351         }
2352         sbi->s_flex_groups = new_groups;
2353         sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2354         return 0;
2355 }
2356
2357 static int ext4_fill_flex_info(struct super_block *sb)
2358 {
2359         struct ext4_sb_info *sbi = EXT4_SB(sb);
2360         struct ext4_group_desc *gdp = NULL;
2361         ext4_group_t flex_group;
2362         int i, err;
2363
2364         sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2365         if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2366                 sbi->s_log_groups_per_flex = 0;
2367                 return 1;
2368         }
2369
2370         err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2371         if (err)
2372                 goto failed;
2373
2374         for (i = 0; i < sbi->s_groups_count; i++) {
2375                 gdp = ext4_get_group_desc(sb, i, NULL);
2376
2377                 flex_group = ext4_flex_group(sbi, i);
2378                 atomic_add(ext4_free_inodes_count(sb, gdp),
2379                            &sbi->s_flex_groups[flex_group].free_inodes);
2380                 atomic64_add(ext4_free_group_clusters(sb, gdp),
2381                              &sbi->s_flex_groups[flex_group].free_clusters);
2382                 atomic_add(ext4_used_dirs_count(sb, gdp),
2383                            &sbi->s_flex_groups[flex_group].used_dirs);
2384         }
2385
2386         return 1;
2387 failed:
2388         return 0;
2389 }
2390
2391 static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2392                                    struct ext4_group_desc *gdp)
2393 {
2394         int offset = offsetof(struct ext4_group_desc, bg_checksum);
2395         __u16 crc = 0;
2396         __le32 le_group = cpu_to_le32(block_group);
2397         struct ext4_sb_info *sbi = EXT4_SB(sb);
2398
2399         if (ext4_has_metadata_csum(sbi->s_sb)) {
2400                 /* Use new metadata_csum algorithm */
2401                 __u32 csum32;
2402                 __u16 dummy_csum = 0;
2403
2404                 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2405                                      sizeof(le_group));
2406                 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2407                 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2408                                      sizeof(dummy_csum));
2409                 offset += sizeof(dummy_csum);
2410                 if (offset < sbi->s_desc_size)
2411                         csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2412                                              sbi->s_desc_size - offset);
2413
2414                 crc = csum32 & 0xFFFF;
2415                 goto out;
2416         }
2417
2418         /* old crc16 code */
2419         if (!ext4_has_feature_gdt_csum(sb))
2420                 return 0;
2421
2422         crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2423         crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2424         crc = crc16(crc, (__u8 *)gdp, offset);
2425         offset += sizeof(gdp->bg_checksum); /* skip checksum */
2426         /* for checksum of struct ext4_group_desc do the rest...*/
2427         if (ext4_has_feature_64bit(sb) &&
2428             offset < le16_to_cpu(sbi->s_es->s_desc_size))
2429                 crc = crc16(crc, (__u8 *)gdp + offset,
2430                             le16_to_cpu(sbi->s_es->s_desc_size) -
2431                                 offset);
2432
2433 out:
2434         return cpu_to_le16(crc);
2435 }
2436
2437 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2438                                 struct ext4_group_desc *gdp)
2439 {
2440         if (ext4_has_group_desc_csum(sb) &&
2441             (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
2442                 return 0;
2443
2444         return 1;
2445 }
2446
2447 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2448                               struct ext4_group_desc *gdp)
2449 {
2450         if (!ext4_has_group_desc_csum(sb))
2451                 return;
2452         gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2453 }
2454
2455 /* Called at mount-time, super-block is locked */
2456 static int ext4_check_descriptors(struct super_block *sb,
2457                                   ext4_fsblk_t sb_block,
2458                                   ext4_group_t *first_not_zeroed)
2459 {
2460         struct ext4_sb_info *sbi = EXT4_SB(sb);
2461         ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2462         ext4_fsblk_t last_block;
2463         ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
2464         ext4_fsblk_t block_bitmap;
2465         ext4_fsblk_t inode_bitmap;
2466         ext4_fsblk_t inode_table;
2467         int flexbg_flag = 0;
2468         ext4_group_t i, grp = sbi->s_groups_count;
2469
2470         if (ext4_has_feature_flex_bg(sb))
2471                 flexbg_flag = 1;
2472
2473         ext4_debug("Checking group descriptors");
2474
2475         for (i = 0; i < sbi->s_groups_count; i++) {
2476                 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2477
2478                 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2479                         last_block = ext4_blocks_count(sbi->s_es) - 1;
2480                 else
2481                         last_block = first_block +
2482                                 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2483
2484                 if ((grp == sbi->s_groups_count) &&
2485                    !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2486                         grp = i;
2487
2488                 block_bitmap = ext4_block_bitmap(sb, gdp);
2489                 if (block_bitmap == sb_block) {
2490                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2491                                  "Block bitmap for group %u overlaps "
2492                                  "superblock", i);
2493                         if (!sb_rdonly(sb))
2494                                 return 0;
2495                 }
2496                 if (block_bitmap >= sb_block + 1 &&
2497                     block_bitmap <= last_bg_block) {
2498                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2499                                  "Block bitmap for group %u overlaps "
2500                                  "block group descriptors", i);
2501                         if (!sb_rdonly(sb))
2502                                 return 0;
2503                 }
2504                 if (block_bitmap < first_block || block_bitmap > last_block) {
2505                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2506                                "Block bitmap for group %u not in group "
2507                                "(block %llu)!", i, block_bitmap);
2508                         return 0;
2509                 }
2510                 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2511                 if (inode_bitmap == sb_block) {
2512                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2513                                  "Inode bitmap for group %u overlaps "
2514                                  "superblock", i);
2515                         if (!sb_rdonly(sb))
2516                                 return 0;
2517                 }
2518                 if (inode_bitmap >= sb_block + 1 &&
2519                     inode_bitmap <= last_bg_block) {
2520                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2521                                  "Inode bitmap for group %u overlaps "
2522                                  "block group descriptors", i);
2523                         if (!sb_rdonly(sb))
2524                                 return 0;
2525                 }
2526                 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2527                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2528                                "Inode bitmap for group %u not in group "
2529                                "(block %llu)!", i, inode_bitmap);
2530                         return 0;
2531                 }
2532                 inode_table = ext4_inode_table(sb, gdp);
2533                 if (inode_table == sb_block) {
2534                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2535                                  "Inode table for group %u overlaps "
2536                                  "superblock", i);
2537                         if (!sb_rdonly(sb))
2538                                 return 0;
2539                 }
2540                 if (inode_table >= sb_block + 1 &&
2541                     inode_table <= last_bg_block) {
2542                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2543                                  "Inode table for group %u overlaps "
2544                                  "block group descriptors", i);
2545                         if (!sb_rdonly(sb))
2546                                 return 0;
2547                 }
2548                 if (inode_table < first_block ||
2549                     inode_table + sbi->s_itb_per_group - 1 > last_block) {
2550                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2551                                "Inode table for group %u not in group "
2552                                "(block %llu)!", i, inode_table);
2553                         return 0;
2554                 }
2555                 ext4_lock_group(sb, i);
2556                 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2557                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2558                                  "Checksum for group %u failed (%u!=%u)",
2559                                  i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2560                                      gdp)), le16_to_cpu(gdp->bg_checksum));
2561                         if (!sb_rdonly(sb)) {
2562                                 ext4_unlock_group(sb, i);
2563                                 return 0;
2564                         }
2565                 }
2566                 ext4_unlock_group(sb, i);
2567                 if (!flexbg_flag)
2568                         first_block += EXT4_BLOCKS_PER_GROUP(sb);
2569         }
2570         if (NULL != first_not_zeroed)
2571                 *first_not_zeroed = grp;
2572         return 1;
2573 }
2574
2575 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2576  * the superblock) which were deleted from all directories, but held open by
2577  * a process at the time of a crash.  We walk the list and try to delete these
2578  * inodes at recovery time (only with a read-write filesystem).
2579  *
2580  * In order to keep the orphan inode chain consistent during traversal (in
2581  * case of crash during recovery), we link each inode into the superblock
2582  * orphan list_head and handle it the same way as an inode deletion during
2583  * normal operation (which journals the operations for us).
2584  *
2585  * We only do an iget() and an iput() on each inode, which is very safe if we
2586  * accidentally point at an in-use or already deleted inode.  The worst that
2587  * can happen in this case is that we get a "bit already cleared" message from
2588  * ext4_free_inode().  The only reason we would point at a wrong inode is if
2589  * e2fsck was run on this filesystem, and it must have already done the orphan
2590  * inode cleanup for us, so we can safely abort without any further action.
2591  */
2592 static void ext4_orphan_cleanup(struct super_block *sb,
2593                                 struct ext4_super_block *es)
2594 {
2595         unsigned int s_flags = sb->s_flags;
2596         int ret, nr_orphans = 0, nr_truncates = 0;
2597 #ifdef CONFIG_QUOTA
2598         int quota_update = 0;
2599         int i;
2600 #endif
2601         if (!es->s_last_orphan) {
2602                 jbd_debug(4, "no orphan inodes to clean up\n");
2603                 return;
2604         }
2605
2606         if (bdev_read_only(sb->s_bdev)) {
2607                 ext4_msg(sb, KERN_ERR, "write access "
2608                         "unavailable, skipping orphan cleanup");
2609                 return;
2610         }
2611
2612         /* Check if feature set would not allow a r/w mount */
2613         if (!ext4_feature_set_ok(sb, 0)) {
2614                 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2615                          "unknown ROCOMPAT features");
2616                 return;
2617         }
2618
2619         if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2620                 /* don't clear list on RO mount w/ errors */
2621                 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
2622                         ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2623                                   "clearing orphan list.\n");
2624                         es->s_last_orphan = 0;
2625                 }
2626                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2627                 return;
2628         }
2629
2630         if (s_flags & SB_RDONLY) {
2631                 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2632                 sb->s_flags &= ~SB_RDONLY;
2633         }
2634 #ifdef CONFIG_QUOTA
2635         /* Needed for iput() to work correctly and not trash data */
2636         sb->s_flags |= SB_ACTIVE;
2637
2638         /*
2639          * Turn on quotas which were not enabled for read-only mounts if
2640          * filesystem has quota feature, so that they are updated correctly.
2641          */
2642         if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
2643                 int ret = ext4_enable_quotas(sb);
2644
2645                 if (!ret)
2646                         quota_update = 1;
2647                 else
2648                         ext4_msg(sb, KERN_ERR,
2649                                 "Cannot turn on quotas: error %d", ret);
2650         }
2651
2652         /* Turn on journaled quotas used for old sytle */
2653         for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2654                 if (EXT4_SB(sb)->s_qf_names[i]) {
2655                         int ret = ext4_quota_on_mount(sb, i);
2656
2657                         if (!ret)
2658                                 quota_update = 1;
2659                         else
2660                                 ext4_msg(sb, KERN_ERR,
2661                                         "Cannot turn on journaled "
2662                                         "quota: type %d: error %d", i, ret);
2663                 }
2664         }
2665 #endif
2666
2667         while (es->s_last_orphan) {
2668                 struct inode *inode;
2669
2670                 /*
2671                  * We may have encountered an error during cleanup; if
2672                  * so, skip the rest.
2673                  */
2674                 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2675                         jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2676                         es->s_last_orphan = 0;
2677                         break;
2678                 }
2679
2680                 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2681                 if (IS_ERR(inode)) {
2682                         es->s_last_orphan = 0;
2683                         break;
2684                 }
2685
2686                 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2687                 dquot_initialize(inode);
2688                 if (inode->i_nlink) {
2689                         if (test_opt(sb, DEBUG))
2690                                 ext4_msg(sb, KERN_DEBUG,
2691                                         "%s: truncating inode %lu to %lld bytes",
2692                                         __func__, inode->i_ino, inode->i_size);
2693                         jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2694                                   inode->i_ino, inode->i_size);
2695                         inode_lock(inode);
2696                         truncate_inode_pages(inode->i_mapping, inode->i_size);
2697                         ret = ext4_truncate(inode);
2698                         if (ret)
2699                                 ext4_std_error(inode->i_sb, ret);
2700                         inode_unlock(inode);
2701                         nr_truncates++;
2702                 } else {
2703                         if (test_opt(sb, DEBUG))
2704                                 ext4_msg(sb, KERN_DEBUG,
2705                                         "%s: deleting unreferenced inode %lu",
2706                                         __func__, inode->i_ino);
2707                         jbd_debug(2, "deleting unreferenced inode %lu\n",
2708                                   inode->i_ino);
2709                         nr_orphans++;
2710                 }
2711                 iput(inode);  /* The delete magic happens here! */
2712         }
2713
2714 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2715
2716         if (nr_orphans)
2717                 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2718                        PLURAL(nr_orphans));
2719         if (nr_truncates)
2720                 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2721                        PLURAL(nr_truncates));
2722 #ifdef CONFIG_QUOTA
2723         /* Turn off quotas if they were enabled for orphan cleanup */
2724         if (quota_update) {
2725                 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2726                         if (sb_dqopt(sb)->files[i])
2727                                 dquot_quota_off(sb, i);
2728                 }
2729         }
2730 #endif
2731         sb->s_flags = s_flags; /* Restore SB_RDONLY status */
2732 }
2733
2734 /*
2735  * Maximal extent format file size.
2736  * Resulting logical blkno at s_maxbytes must fit in our on-disk
2737  * extent format containers, within a sector_t, and within i_blocks
2738  * in the vfs.  ext4 inode has 48 bits of i_block in fsblock units,
2739  * so that won't be a limiting factor.
2740  *
2741  * However there is other limiting factor. We do store extents in the form
2742  * of starting block and length, hence the resulting length of the extent
2743  * covering maximum file size must fit into on-disk format containers as
2744  * well. Given that length is always by 1 unit bigger than max unit (because
2745  * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2746  *
2747  * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2748  */
2749 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2750 {
2751         loff_t res;
2752         loff_t upper_limit = MAX_LFS_FILESIZE;
2753
2754         BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
2755
2756         if (!has_huge_files) {
2757                 upper_limit = (1LL << 32) - 1;
2758
2759                 /* total blocks in file system block size */
2760                 upper_limit >>= (blkbits - 9);
2761                 upper_limit <<= blkbits;
2762         }
2763
2764         /*
2765          * 32-bit extent-start container, ee_block. We lower the maxbytes
2766          * by one fs block, so ee_len can cover the extent of maximum file
2767          * size
2768          */
2769         res = (1LL << 32) - 1;
2770         res <<= blkbits;
2771
2772         /* Sanity check against vm- & vfs- imposed limits */
2773         if (res > upper_limit)
2774                 res = upper_limit;
2775
2776         return res;
2777 }
2778
2779 /*
2780  * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2781  * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2782  * We need to be 1 filesystem block less than the 2^48 sector limit.
2783  */
2784 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2785 {
2786         loff_t res = EXT4_NDIR_BLOCKS;
2787         int meta_blocks;
2788         loff_t upper_limit;
2789         /* This is calculated to be the largest file size for a dense, block
2790          * mapped file such that the file's total number of 512-byte sectors,
2791          * including data and all indirect blocks, does not exceed (2^48 - 1).
2792          *
2793          * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2794          * number of 512-byte sectors of the file.
2795          */
2796
2797         if (!has_huge_files) {
2798                 /*
2799                  * !has_huge_files or implies that the inode i_block field
2800                  * represents total file blocks in 2^32 512-byte sectors ==
2801                  * size of vfs inode i_blocks * 8
2802                  */
2803                 upper_limit = (1LL << 32) - 1;
2804
2805                 /* total blocks in file system block size */
2806                 upper_limit >>= (bits - 9);
2807
2808         } else {
2809                 /*
2810                  * We use 48 bit ext4_inode i_blocks
2811                  * With EXT4_HUGE_FILE_FL set the i_blocks
2812                  * represent total number of blocks in
2813                  * file system block size
2814                  */
2815                 upper_limit = (1LL << 48) - 1;
2816
2817         }
2818
2819         /* indirect blocks */
2820         meta_blocks = 1;
2821         /* double indirect blocks */
2822         meta_blocks += 1 + (1LL << (bits-2));
2823         /* tripple indirect blocks */
2824         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2825
2826         upper_limit -= meta_blocks;
2827         upper_limit <<= bits;
2828
2829         res += 1LL << (bits-2);
2830         res += 1LL << (2*(bits-2));
2831         res += 1LL << (3*(bits-2));
2832         res <<= bits;
2833         if (res > upper_limit)
2834                 res = upper_limit;
2835
2836         if (res > MAX_LFS_FILESIZE)
2837                 res = MAX_LFS_FILESIZE;
2838
2839         return res;
2840 }
2841
2842 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2843                                    ext4_fsblk_t logical_sb_block, int nr)
2844 {
2845         struct ext4_sb_info *sbi = EXT4_SB(sb);
2846         ext4_group_t bg, first_meta_bg;
2847         int has_super = 0;
2848
2849         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2850
2851         if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
2852                 return logical_sb_block + nr + 1;
2853         bg = sbi->s_desc_per_block * nr;
2854         if (ext4_bg_has_super(sb, bg))
2855                 has_super = 1;
2856
2857         /*
2858          * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2859          * block 2, not 1.  If s_first_data_block == 0 (bigalloc is enabled
2860          * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2861          * compensate.
2862          */
2863         if (sb->s_blocksize == 1024 && nr == 0 &&
2864             le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
2865                 has_super++;
2866
2867         return (has_super + ext4_group_first_block_no(sb, bg));
2868 }
2869
2870 /**
2871  * ext4_get_stripe_size: Get the stripe size.
2872  * @sbi: In memory super block info
2873  *
2874  * If we have specified it via mount option, then
2875  * use the mount option value. If the value specified at mount time is
2876  * greater than the blocks per group use the super block value.
2877  * If the super block value is greater than blocks per group return 0.
2878  * Allocator needs it be less than blocks per group.
2879  *
2880  */
2881 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2882 {
2883         unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2884         unsigned long stripe_width =
2885                         le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2886         int ret;
2887
2888         if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2889                 ret = sbi->s_stripe;
2890         else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
2891                 ret = stripe_width;
2892         else if (stride && stride <= sbi->s_blocks_per_group)
2893                 ret = stride;
2894         else
2895                 ret = 0;
2896
2897         /*
2898          * If the stripe width is 1, this makes no sense and
2899          * we set it to 0 to turn off stripe handling code.
2900          */
2901         if (ret <= 1)
2902                 ret = 0;
2903
2904         return ret;
2905 }
2906
2907 /*
2908  * Check whether this filesystem can be mounted based on
2909  * the features present and the RDONLY/RDWR mount requested.
2910  * Returns 1 if this filesystem can be mounted as requested,
2911  * 0 if it cannot be.
2912  */
2913 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2914 {
2915         if (ext4_has_unknown_ext4_incompat_features(sb)) {
2916                 ext4_msg(sb, KERN_ERR,
2917                         "Couldn't mount because of "
2918                         "unsupported optional features (%x)",
2919                         (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2920                         ~EXT4_FEATURE_INCOMPAT_SUPP));
2921                 return 0;
2922         }
2923
2924 #ifndef CONFIG_UNICODE
2925         if (ext4_has_feature_casefold(sb)) {
2926                 ext4_msg(sb, KERN_ERR,
2927                          "Filesystem with casefold feature cannot be "
2928                          "mounted without CONFIG_UNICODE");
2929                 return 0;
2930         }
2931 #endif
2932
2933         if (readonly)
2934                 return 1;
2935
2936         if (ext4_has_feature_readonly(sb)) {
2937                 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2938                 sb->s_flags |= SB_RDONLY;
2939                 return 1;
2940         }
2941
2942         /* Check that feature set is OK for a read-write mount */
2943         if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
2944                 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2945                          "unsupported optional features (%x)",
2946                          (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2947                                 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2948                 return 0;
2949         }
2950         if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
2951                 ext4_msg(sb, KERN_ERR,
2952                          "Can't support bigalloc feature without "
2953                          "extents feature\n");
2954                 return 0;
2955         }
2956
2957 #ifndef CONFIG_QUOTA
2958         if (ext4_has_feature_quota(sb) && !readonly) {
2959                 ext4_msg(sb, KERN_ERR,
2960                          "Filesystem with quota feature cannot be mounted RDWR "
2961                          "without CONFIG_QUOTA");
2962                 return 0;
2963         }
2964         if (ext4_has_feature_project(sb) && !readonly) {
2965                 ext4_msg(sb, KERN_ERR,
2966                          "Filesystem with project quota feature cannot be mounted RDWR "
2967                          "without CONFIG_QUOTA");
2968                 return 0;
2969         }
2970 #endif  /* CONFIG_QUOTA */
2971         return 1;
2972 }
2973
2974 /*
2975  * This function is called once a day if we have errors logged
2976  * on the file system
2977  */
2978 static void print_daily_error_info(struct timer_list *t)
2979 {
2980         struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
2981         struct super_block *sb = sbi->s_sb;
2982         struct ext4_super_block *es = sbi->s_es;
2983
2984         if (es->s_error_count)
2985                 /* fsck newer than v1.41.13 is needed to clean this condition. */
2986                 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2987                          le32_to_cpu(es->s_error_count));
2988         if (es->s_first_error_time) {
2989                 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
2990                        sb->s_id,
2991                        ext4_get_tstamp(es, s_first_error_time),
2992                        (int) sizeof(es->s_first_error_func),
2993                        es->s_first_error_func,
2994                        le32_to_cpu(es->s_first_error_line));
2995                 if (es->s_first_error_ino)
2996                         printk(KERN_CONT ": inode %u",
2997                                le32_to_cpu(es->s_first_error_ino));
2998                 if (es->s_first_error_block)
2999                         printk(KERN_CONT ": block %llu", (unsigned long long)
3000                                le64_to_cpu(es->s_first_error_block));
3001                 printk(KERN_CONT "\n");
3002         }
3003         if (es->s_last_error_time) {
3004                 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3005                        sb->s_id,
3006                        ext4_get_tstamp(es, s_last_error_time),
3007                        (int) sizeof(es->s_last_error_func),
3008                        es->s_last_error_func,
3009                        le32_to_cpu(es->s_last_error_line));
3010                 if (es->s_last_error_ino)
3011                         printk(KERN_CONT ": inode %u",
3012                                le32_to_cpu(es->s_last_error_ino));
3013                 if (es->s_last_error_block)
3014                         printk(KERN_CONT ": block %llu", (unsigned long long)
3015                                le64_to_cpu(es->s_last_error_block));
3016                 printk(KERN_CONT "\n");
3017         }
3018         mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
3019 }
3020
3021 /* Find next suitable group and run ext4_init_inode_table */
3022 static int ext4_run_li_request(struct ext4_li_request *elr)
3023 {
3024         struct ext4_group_desc *gdp = NULL;
3025         ext4_group_t group, ngroups;
3026         struct super_block *sb;
3027         unsigned long timeout = 0;
3028         int ret = 0;
3029
3030         sb = elr->lr_super;
3031         ngroups = EXT4_SB(sb)->s_groups_count;
3032
3033         for (group = elr->lr_next_group; group < ngroups; group++) {
3034                 gdp = ext4_get_group_desc(sb, group, NULL);
3035                 if (!gdp) {
3036                         ret = 1;
3037                         break;
3038                 }
3039
3040                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3041                         break;
3042         }
3043
3044         if (group >= ngroups)
3045                 ret = 1;
3046
3047         if (!ret) {
3048                 timeout = jiffies;
3049                 ret = ext4_init_inode_table(sb, group,
3050                                             elr->lr_timeout ? 0 : 1);
3051                 if (elr->lr_timeout == 0) {
3052                         timeout = (jiffies - timeout) *
3053                                   elr->lr_sbi->s_li_wait_mult;
3054                         elr->lr_timeout = timeout;
3055                 }
3056                 elr->lr_next_sched = jiffies + elr->lr_timeout;
3057                 elr->lr_next_group = group + 1;
3058         }
3059         return ret;
3060 }
3061
3062 /*
3063  * Remove lr_request from the list_request and free the
3064  * request structure. Should be called with li_list_mtx held
3065  */
3066 static void ext4_remove_li_request(struct ext4_li_request *elr)
3067 {
3068         struct ext4_sb_info *sbi;
3069
3070         if (!elr)
3071                 return;
3072
3073         sbi = elr->lr_sbi;
3074
3075         list_del(&elr->lr_request);
3076         sbi->s_li_request = NULL;
3077         kfree(elr);
3078 }
3079
3080 static void ext4_unregister_li_request(struct super_block *sb)
3081 {
3082         mutex_lock(&ext4_li_mtx);
3083         if (!ext4_li_info) {
3084                 mutex_unlock(&ext4_li_mtx);
3085                 return;
3086         }
3087
3088         mutex_lock(&ext4_li_info->li_list_mtx);
3089         ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
3090         mutex_unlock(&ext4_li_info->li_list_mtx);
3091         mutex_unlock(&ext4_li_mtx);
3092 }
3093
3094 static struct task_struct *ext4_lazyinit_task;
3095
3096 /*
3097  * This is the function where ext4lazyinit thread lives. It walks
3098  * through the request list searching for next scheduled filesystem.
3099  * When such a fs is found, run the lazy initialization request
3100  * (ext4_rn_li_request) and keep track of the time spend in this
3101  * function. Based on that time we compute next schedule time of
3102  * the request. When walking through the list is complete, compute
3103  * next waking time and put itself into sleep.
3104  */
3105 static int ext4_lazyinit_thread(void *arg)
3106 {
3107         struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3108         struct list_head *pos, *n;
3109         struct ext4_li_request *elr;
3110         unsigned long next_wakeup, cur;
3111
3112         BUG_ON(NULL == eli);
3113
3114 cont_thread:
3115         while (true) {
3116                 next_wakeup = MAX_JIFFY_OFFSET;
3117
3118                 mutex_lock(&eli->li_list_mtx);
3119                 if (list_empty(&eli->li_request_list)) {
3120                         mutex_unlock(&eli->li_list_mtx);
3121                         goto exit_thread;
3122                 }
3123                 list_for_each_safe(pos, n, &eli->li_request_list) {
3124                         int err = 0;
3125                         int progress = 0;
3126                         elr = list_entry(pos, struct ext4_li_request,
3127                                          lr_request);
3128
3129                         if (time_before(jiffies, elr->lr_next_sched)) {
3130                                 if (time_before(elr->lr_next_sched, next_wakeup))
3131                                         next_wakeup = elr->lr_next_sched;
3132                                 continue;
3133                         }
3134                         if (down_read_trylock(&elr->lr_super->s_umount)) {
3135                                 if (sb_start_write_trylock(elr->lr_super)) {
3136                                         progress = 1;
3137                                         /*
3138                                          * We hold sb->s_umount, sb can not
3139                                          * be removed from the list, it is
3140                                          * now safe to drop li_list_mtx
3141                                          */
3142                                         mutex_unlock(&eli->li_list_mtx);
3143                                         err = ext4_run_li_request(elr);
3144                                         sb_end_write(elr->lr_super);
3145                                         mutex_lock(&eli->li_list_mtx);
3146                                         n = pos->next;
3147                                 }
3148                                 up_read((&elr->lr_super->s_umount));
3149                         }
3150                         /* error, remove the lazy_init job */
3151                         if (err) {
3152                                 ext4_remove_li_request(elr);
3153                                 continue;
3154                         }
3155                         if (!progress) {
3156                                 elr->lr_next_sched = jiffies +
3157                                         (prandom_u32()
3158                                          % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3159                         }
3160                         if (time_before(elr->lr_next_sched, next_wakeup))
3161                                 next_wakeup = elr->lr_next_sched;
3162                 }
3163                 mutex_unlock(&eli->li_list_mtx);
3164
3165                 try_to_freeze();
3166
3167                 cur = jiffies;
3168                 if ((time_after_eq(cur, next_wakeup)) ||
3169                     (MAX_JIFFY_OFFSET == next_wakeup)) {
3170                         cond_resched();
3171                         continue;
3172                 }
3173
3174                 schedule_timeout_interruptible(next_wakeup - cur);
3175
3176                 if (kthread_should_stop()) {
3177                         ext4_clear_request_list();
3178                         goto exit_thread;
3179                 }
3180         }
3181
3182 exit_thread:
3183         /*
3184          * It looks like the request list is empty, but we need
3185          * to check it under the li_list_mtx lock, to prevent any
3186          * additions into it, and of course we should lock ext4_li_mtx
3187          * to atomically free the list and ext4_li_info, because at
3188          * this point another ext4 filesystem could be registering
3189          * new one.
3190          */
3191         mutex_lock(&ext4_li_mtx);
3192         mutex_lock(&eli->li_list_mtx);
3193         if (!list_empty(&eli->li_request_list)) {
3194                 mutex_unlock(&eli->li_list_mtx);
3195                 mutex_unlock(&ext4_li_mtx);
3196                 goto cont_thread;
3197         }
3198         mutex_unlock(&eli->li_list_mtx);
3199         kfree(ext4_li_info);
3200         ext4_li_info = NULL;
3201         mutex_unlock(&ext4_li_mtx);
3202
3203         return 0;
3204 }
3205
3206 static void ext4_clear_request_list(void)
3207 {
3208         struct list_head *pos, *n;
3209         struct ext4_li_request *elr;
3210
3211         mutex_lock(&ext4_li_info->li_list_mtx);
3212         list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3213                 elr = list_entry(pos, struct ext4_li_request,
3214                                  lr_request);
3215                 ext4_remove_li_request(elr);
3216         }
3217         mutex_unlock(&ext4_li_info->li_list_mtx);
3218 }
3219
3220 static int ext4_run_lazyinit_thread(void)
3221 {
3222         ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3223                                          ext4_li_info, "ext4lazyinit");
3224         if (IS_ERR(ext4_lazyinit_task)) {
3225                 int err = PTR_ERR(ext4_lazyinit_task);
3226                 ext4_clear_request_list();
3227                 kfree(ext4_li_info);
3228                 ext4_li_info = NULL;
3229                 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3230                                  "initialization thread\n",
3231                                  err);
3232                 return err;
3233         }
3234         ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3235         return 0;
3236 }
3237
3238 /*
3239  * Check whether it make sense to run itable init. thread or not.
3240  * If there is at least one uninitialized inode table, return
3241  * corresponding group number, else the loop goes through all
3242  * groups and return total number of groups.
3243  */
3244 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3245 {
3246         ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3247         struct ext4_group_desc *gdp = NULL;
3248
3249         if (!ext4_has_group_desc_csum(sb))
3250                 return ngroups;
3251
3252         for (group = 0; group < ngroups; group++) {
3253                 gdp = ext4_get_group_desc(sb, group, NULL);
3254                 if (!gdp)
3255                         continue;
3256
3257                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3258                         break;
3259         }
3260
3261         return group;
3262 }
3263
3264 static int ext4_li_info_new(void)
3265 {
3266         struct ext4_lazy_init *eli = NULL;
3267
3268         eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3269         if (!eli)
3270                 return -ENOMEM;
3271
3272         INIT_LIST_HEAD(&eli->li_request_list);
3273         mutex_init(&eli->li_list_mtx);
3274
3275         eli->li_state |= EXT4_LAZYINIT_QUIT;
3276
3277         ext4_li_info = eli;
3278
3279         return 0;
3280 }
3281
3282 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3283                                             ext4_group_t start)
3284 {
3285         struct ext4_sb_info *sbi = EXT4_SB(sb);
3286         struct ext4_li_request *elr;
3287
3288         elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3289         if (!elr)
3290                 return NULL;
3291
3292         elr->lr_super = sb;
3293         elr->lr_sbi = sbi;
3294         elr->lr_next_group = start;
3295
3296         /*
3297          * Randomize first schedule time of the request to
3298          * spread the inode table initialization requests
3299          * better.
3300          */
3301         elr->lr_next_sched = jiffies + (prandom_u32() %
3302                                 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3303         return elr;
3304 }
3305
3306 int ext4_register_li_request(struct super_block *sb,
3307                              ext4_group_t first_not_zeroed)
3308 {
3309         struct ext4_sb_info *sbi = EXT4_SB(sb);
3310         struct ext4_li_request *elr = NULL;
3311         ext4_group_t ngroups = sbi->s_groups_count;
3312         int ret = 0;
3313
3314         mutex_lock(&ext4_li_mtx);
3315         if (sbi->s_li_request != NULL) {
3316                 /*
3317                  * Reset timeout so it can be computed again, because
3318                  * s_li_wait_mult might have changed.
3319                  */
3320                 sbi->s_li_request->lr_timeout = 0;
3321                 goto out;
3322         }
3323
3324         if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
3325             !test_opt(sb, INIT_INODE_TABLE))
3326                 goto out;
3327
3328         elr = ext4_li_request_new(sb, first_not_zeroed);
3329         if (!elr) {
3330                 ret = -ENOMEM;
3331                 goto out;
3332         }
3333
3334         if (NULL == ext4_li_info) {
3335                 ret = ext4_li_info_new();
3336                 if (ret)
3337                         goto out;
3338         }
3339
3340         mutex_lock(&ext4_li_info->li_list_mtx);
3341         list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3342         mutex_unlock(&ext4_li_info->li_list_mtx);
3343
3344         sbi->s_li_request = elr;
3345         /*
3346          * set elr to NULL here since it has been inserted to
3347          * the request_list and the removal and free of it is
3348          * handled by ext4_clear_request_list from now on.
3349          */
3350         elr = NULL;
3351
3352         if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3353                 ret = ext4_run_lazyinit_thread();
3354                 if (ret)
3355                         goto out;
3356         }
3357 out:
3358         mutex_unlock(&ext4_li_mtx);
3359         if (ret)
3360                 kfree(elr);
3361         return ret;
3362 }
3363
3364 /*
3365  * We do not need to lock anything since this is called on
3366  * module unload.
3367  */
3368 static void ext4_destroy_lazyinit_thread(void)
3369 {
3370         /*
3371          * If thread exited earlier
3372          * there's nothing to be done.
3373          */
3374         if (!ext4_li_info || !ext4_lazyinit_task)
3375                 return;
3376
3377         kthread_stop(ext4_lazyinit_task);
3378 }
3379
3380 static int set_journal_csum_feature_set(struct super_block *sb)
3381 {
3382         int ret = 1;
3383         int compat, incompat;
3384         struct ext4_sb_info *sbi = EXT4_SB(sb);
3385
3386         if (ext4_has_metadata_csum(sb)) {
3387                 /* journal checksum v3 */
3388                 compat = 0;
3389                 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
3390         } else {
3391                 /* journal checksum v1 */
3392                 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3393                 incompat = 0;
3394         }
3395
3396         jbd2_journal_clear_features(sbi->s_journal,
3397                         JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3398                         JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3399                         JBD2_FEATURE_INCOMPAT_CSUM_V2);
3400         if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3401                 ret = jbd2_journal_set_features(sbi->s_journal,
3402                                 compat, 0,
3403                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3404                                 incompat);
3405         } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3406                 ret = jbd2_journal_set_features(sbi->s_journal,
3407                                 compat, 0,
3408                                 incompat);
3409                 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3410                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3411         } else {
3412                 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3413                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3414         }
3415
3416         return ret;
3417 }
3418
3419 /*
3420  * Note: calculating the overhead so we can be compatible with
3421  * historical BSD practice is quite difficult in the face of
3422  * clusters/bigalloc.  This is because multiple metadata blocks from
3423  * different block group can end up in the same allocation cluster.
3424  * Calculating the exact overhead in the face of clustered allocation
3425  * requires either O(all block bitmaps) in memory or O(number of block
3426  * groups**2) in time.  We will still calculate the superblock for
3427  * older file systems --- and if we come across with a bigalloc file
3428  * system with zero in s_overhead_clusters the estimate will be close to
3429  * correct especially for very large cluster sizes --- but for newer
3430  * file systems, it's better to calculate this figure once at mkfs
3431  * time, and store it in the superblock.  If the superblock value is
3432  * present (even for non-bigalloc file systems), we will use it.
3433  */
3434 static int count_overhead(struct super_block *sb, ext4_group_t grp,
3435                           char *buf)
3436 {
3437         struct ext4_sb_info     *sbi = EXT4_SB(sb);
3438         struct ext4_group_desc  *gdp;
3439         ext4_fsblk_t            first_block, last_block, b;
3440         ext4_group_t            i, ngroups = ext4_get_groups_count(sb);
3441         int                     s, j, count = 0;
3442
3443         if (!ext4_has_feature_bigalloc(sb))
3444                 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3445                         sbi->s_itb_per_group + 2);
3446
3447         first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3448                 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3449         last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3450         for (i = 0; i < ngroups; i++) {
3451                 gdp = ext4_get_group_desc(sb, i, NULL);
3452                 b = ext4_block_bitmap(sb, gdp);
3453                 if (b >= first_block && b <= last_block) {
3454                         ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3455                         count++;
3456                 }
3457                 b = ext4_inode_bitmap(sb, gdp);
3458                 if (b >= first_block && b <= last_block) {
3459                         ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3460                         count++;
3461                 }
3462                 b = ext4_inode_table(sb, gdp);
3463                 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3464                         for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3465                                 int c = EXT4_B2C(sbi, b - first_block);
3466                                 ext4_set_bit(c, buf);
3467                                 count++;
3468                         }
3469                 if (i != grp)
3470                         continue;
3471                 s = 0;
3472                 if (ext4_bg_has_super(sb, grp)) {
3473                         ext4_set_bit(s++, buf);
3474                         count++;
3475                 }
3476                 j = ext4_bg_num_gdb(sb, grp);
3477                 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3478                         ext4_error(sb, "Invalid number of block group "
3479                                    "descriptor blocks: %d", j);
3480                         j = EXT4_BLOCKS_PER_GROUP(sb) - s;
3481                 }
3482                 count += j;
3483                 for (; j > 0; j--)
3484                         ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3485         }
3486         if (!count)
3487                 return 0;
3488         return EXT4_CLUSTERS_PER_GROUP(sb) -
3489                 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3490 }
3491
3492 /*
3493  * Compute the overhead and stash it in sbi->s_overhead
3494  */
3495 int ext4_calculate_overhead(struct super_block *sb)
3496 {
3497         struct ext4_sb_info *sbi = EXT4_SB(sb);
3498         struct ext4_super_block *es = sbi->s_es;
3499         struct inode *j_inode;
3500         unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
3501         ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3502         ext4_fsblk_t overhead = 0;
3503         char *buf = (char *) get_zeroed_page(GFP_NOFS);
3504
3505         if (!buf)
3506                 return -ENOMEM;
3507
3508         /*
3509          * Compute the overhead (FS structures).  This is constant
3510          * for a given filesystem unless the number of block groups
3511          * changes so we cache the previous value until it does.
3512          */
3513
3514         /*
3515          * All of the blocks before first_data_block are overhead
3516          */
3517         overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3518
3519         /*
3520          * Add the overhead found in each block group
3521          */
3522         for (i = 0; i < ngroups; i++) {
3523                 int blks;
3524
3525                 blks = count_overhead(sb, i, buf);
3526                 overhead += blks;
3527                 if (blks)
3528                         memset(buf, 0, PAGE_SIZE);
3529                 cond_resched();
3530         }
3531
3532         /*
3533          * Add the internal journal blocks whether the journal has been
3534          * loaded or not
3535          */
3536         if (sbi->s_journal && !sbi->journal_bdev)
3537                 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3538         else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3539                 j_inode = ext4_get_journal_inode(sb, j_inum);
3540                 if (j_inode) {
3541                         j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3542                         overhead += EXT4_NUM_B2C(sbi, j_blocks);
3543                         iput(j_inode);
3544                 } else {
3545                         ext4_msg(sb, KERN_ERR, "can't get journal size");
3546                 }
3547         }
3548         sbi->s_overhead = overhead;
3549         smp_wmb();
3550         free_page((unsigned long) buf);
3551         return 0;
3552 }
3553
3554 static void ext4_clamp_want_extra_isize(struct super_block *sb)
3555 {
3556         struct ext4_sb_info *sbi = EXT4_SB(sb);
3557         struct ext4_super_block *es = sbi->s_es;
3558
3559         /* determine the minimum size of new large inodes, if present */
3560         if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE &&
3561             sbi->s_want_extra_isize == 0) {
3562                 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3563                                                      EXT4_GOOD_OLD_INODE_SIZE;
3564                 if (ext4_has_feature_extra_isize(sb)) {
3565                         if (sbi->s_want_extra_isize <
3566                             le16_to_cpu(es->s_want_extra_isize))
3567                                 sbi->s_want_extra_isize =
3568                                         le16_to_cpu(es->s_want_extra_isize);
3569                         if (sbi->s_want_extra_isize <
3570                             le16_to_cpu(es->s_min_extra_isize))
3571                                 sbi->s_want_extra_isize =
3572                                         le16_to_cpu(es->s_min_extra_isize);
3573                 }
3574         }
3575         /* Check if enough inode space is available */
3576         if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3577                                                         sbi->s_inode_size) {
3578                 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3579                                                        EXT4_GOOD_OLD_INODE_SIZE;
3580                 ext4_msg(sb, KERN_INFO,
3581                          "required extra inode space not available");
3582         }
3583 }
3584
3585 static void ext4_set_resv_clusters(struct super_block *sb)
3586 {
3587         ext4_fsblk_t resv_clusters;
3588         struct ext4_sb_info *sbi = EXT4_SB(sb);
3589
3590         /*
3591          * There's no need to reserve anything when we aren't using extents.
3592          * The space estimates are exact, there are no unwritten extents,
3593          * hole punching doesn't need new metadata... This is needed especially
3594          * to keep ext2/3 backward compatibility.
3595          */
3596         if (!ext4_has_feature_extents(sb))
3597                 return;
3598         /*
3599          * By default we reserve 2% or 4096 clusters, whichever is smaller.
3600          * This should cover the situations where we can not afford to run
3601          * out of space like for example punch hole, or converting
3602          * unwritten extents in delalloc path. In most cases such
3603          * allocation would require 1, or 2 blocks, higher numbers are
3604          * very rare.
3605          */
3606         resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3607                          sbi->s_cluster_bits);
3608
3609         do_div(resv_clusters, 50);
3610         resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3611
3612         atomic64_set(&sbi->s_resv_clusters, resv_clusters);
3613 }
3614
3615 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3616 {
3617         struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
3618         char *orig_data = kstrdup(data, GFP_KERNEL);
3619         struct buffer_head *bh;
3620         struct ext4_super_block *es = NULL;
3621         struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3622         ext4_fsblk_t block;
3623         ext4_fsblk_t sb_block = get_sb_block(&data);
3624         ext4_fsblk_t logical_sb_block;
3625         unsigned long offset = 0;
3626         unsigned long journal_devnum = 0;
3627         unsigned long def_mount_opts;
3628         struct inode *root;
3629         const char *descr;
3630         int ret = -ENOMEM;
3631         int blocksize, clustersize;
3632         unsigned int db_count;
3633         unsigned int i;
3634         int needs_recovery, has_huge_files, has_bigalloc;
3635         __u64 blocks_count;
3636         int err = 0;
3637         unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3638         ext4_group_t first_not_zeroed;
3639
3640         if ((data && !orig_data) || !sbi)
3641                 goto out_free_base;
3642
3643         sbi->s_daxdev = dax_dev;
3644         sbi->s_blockgroup_lock =
3645                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3646         if (!sbi->s_blockgroup_lock)
3647                 goto out_free_base;
3648
3649         sb->s_fs_info = sbi;
3650         sbi->s_sb = sb;
3651         sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3652         sbi->s_sb_block = sb_block;
3653         if (sb->s_bdev->bd_part)
3654                 sbi->s_sectors_written_start =
3655                         part_stat_read(sb->s_bdev->bd_part, sectors[STAT_WRITE]);
3656
3657         /* Cleanup superblock name */
3658         strreplace(sb->s_id, '/', '!');
3659
3660         /* -EINVAL is default */
3661         ret = -EINVAL;
3662         blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3663         if (!blocksize) {
3664                 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3665                 goto out_fail;
3666         }
3667
3668         /*
3669          * The ext4 superblock will not be buffer aligned for other than 1kB
3670          * block sizes.  We need to calculate the offset from buffer start.
3671          */
3672         if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3673                 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3674                 offset = do_div(logical_sb_block, blocksize);
3675         } else {
3676                 logical_sb_block = sb_block;
3677         }
3678
3679         if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3680                 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3681                 goto out_fail;
3682         }
3683         /*
3684          * Note: s_es must be initialized as soon as possible because
3685          *       some ext4 macro-instructions depend on its value
3686          */
3687         es = (struct ext4_super_block *) (bh->b_data + offset);
3688         sbi->s_es = es;
3689         sb->s_magic = le16_to_cpu(es->s_magic);
3690         if (sb->s_magic != EXT4_SUPER_MAGIC)
3691                 goto cantfind_ext4;
3692         sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3693
3694         /* Warn if metadata_csum and gdt_csum are both set. */
3695         if (ext4_has_feature_metadata_csum(sb) &&
3696             ext4_has_feature_gdt_csum(sb))
3697                 ext4_warning(sb, "metadata_csum and uninit_bg are "
3698                              "redundant flags; please run fsck.");
3699
3700         /* Check for a known checksum algorithm */
3701         if (!ext4_verify_csum_type(sb, es)) {
3702                 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3703                          "unknown checksum algorithm.");
3704                 silent = 1;
3705                 goto cantfind_ext4;
3706         }
3707
3708         /* Load the checksum driver */
3709         sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3710         if (IS_ERR(sbi->s_chksum_driver)) {
3711                 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3712                 ret = PTR_ERR(sbi->s_chksum_driver);
3713                 sbi->s_chksum_driver = NULL;
3714                 goto failed_mount;
3715         }
3716
3717         /* Check superblock checksum */
3718         if (!ext4_superblock_csum_verify(sb, es)) {
3719                 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3720                          "invalid superblock checksum.  Run e2fsck?");
3721                 silent = 1;
3722                 ret = -EFSBADCRC;
3723                 goto cantfind_ext4;
3724         }
3725
3726         /* Precompute checksum seed for all metadata */
3727         if (ext4_has_feature_csum_seed(sb))
3728                 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3729         else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
3730                 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3731                                                sizeof(es->s_uuid));
3732
3733         /* Set defaults before we parse the mount options */
3734         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3735         set_opt(sb, INIT_INODE_TABLE);
3736         if (def_mount_opts & EXT4_DEFM_DEBUG)
3737                 set_opt(sb, DEBUG);
3738         if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3739                 set_opt(sb, GRPID);
3740         if (def_mount_opts & EXT4_DEFM_UID16)
3741                 set_opt(sb, NO_UID32);
3742         /* xattr user namespace & acls are now defaulted on */
3743         set_opt(sb, XATTR_USER);
3744 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3745         set_opt(sb, POSIX_ACL);
3746 #endif
3747         /* don't forget to enable journal_csum when metadata_csum is enabled. */
3748         if (ext4_has_metadata_csum(sb))
3749                 set_opt(sb, JOURNAL_CHECKSUM);
3750
3751         if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3752                 set_opt(sb, JOURNAL_DATA);
3753         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3754                 set_opt(sb, ORDERED_DATA);
3755         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3756                 set_opt(sb, WRITEBACK_DATA);
3757
3758         if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3759                 set_opt(sb, ERRORS_PANIC);
3760         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3761                 set_opt(sb, ERRORS_CONT);
3762         else
3763                 set_opt(sb, ERRORS_RO);
3764         /* block_validity enabled by default; disable with noblock_validity */
3765         set_opt(sb, BLOCK_VALIDITY);
3766         if (def_mount_opts & EXT4_DEFM_DISCARD)
3767                 set_opt(sb, DISCARD);
3768
3769         sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3770         sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3771         sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3772         sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3773         sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3774
3775         if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3776                 set_opt(sb, BARRIER);
3777
3778         /*
3779          * enable delayed allocation by default
3780          * Use -o nodelalloc to turn it off
3781          */
3782         if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3783             ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3784                 set_opt(sb, DELALLOC);
3785
3786         /*
3787          * set default s_li_wait_mult for lazyinit, for the case there is
3788          * no mount option specified.
3789          */
3790         sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3791
3792         if (sbi->s_es->s_mount_opts[0]) {
3793                 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3794                                               sizeof(sbi->s_es->s_mount_opts),
3795                                               GFP_KERNEL);
3796                 if (!s_mount_opts)
3797                         goto failed_mount;
3798                 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3799                                    &journal_ioprio, 0)) {
3800                         ext4_msg(sb, KERN_WARNING,
3801                                  "failed to parse options in superblock: %s",
3802                                  s_mount_opts);
3803                 }
3804                 kfree(s_mount_opts);
3805         }
3806         sbi->s_def_mount_opt = sbi->s_mount_opt;
3807         if (!parse_options((char *) data, sb, &journal_devnum,
3808                            &journal_ioprio, 0))
3809                 goto failed_mount;
3810
3811 #ifdef CONFIG_UNICODE
3812         if (ext4_has_feature_casefold(sb) && !sbi->s_encoding) {
3813                 const struct ext4_sb_encodings *encoding_info;
3814                 struct unicode_map *encoding;
3815                 __u16 encoding_flags;
3816
3817                 if (ext4_has_feature_encrypt(sb)) {
3818                         ext4_msg(sb, KERN_ERR,
3819                                  "Can't mount with encoding and encryption");
3820                         goto failed_mount;
3821                 }
3822
3823                 if (ext4_sb_read_encoding(es, &encoding_info,
3824                                           &encoding_flags)) {
3825                         ext4_msg(sb, KERN_ERR,
3826                                  "Encoding requested by superblock is unknown");
3827                         goto failed_mount;
3828                 }
3829
3830                 encoding = utf8_load(encoding_info->version);
3831                 if (IS_ERR(encoding)) {
3832                         ext4_msg(sb, KERN_ERR,
3833                                  "can't mount with superblock charset: %s-%s "
3834                                  "not supported by the kernel. flags: 0x%x.",
3835                                  encoding_info->name, encoding_info->version,
3836                                  encoding_flags);
3837                         goto failed_mount;
3838                 }
3839                 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
3840                          "%s-%s with flags 0x%hx", encoding_info->name,
3841                          encoding_info->version?:"\b", encoding_flags);
3842
3843                 sbi->s_encoding = encoding;
3844                 sbi->s_encoding_flags = encoding_flags;
3845         }
3846 #endif
3847
3848         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3849                 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3850                             "with data=journal disables delayed "
3851                             "allocation and O_DIRECT support!\n");
3852                 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3853                         ext4_msg(sb, KERN_ERR, "can't mount with "
3854                                  "both data=journal and delalloc");
3855                         goto failed_mount;
3856                 }
3857                 if (test_opt(sb, DIOREAD_NOLOCK)) {
3858                         ext4_msg(sb, KERN_ERR, "can't mount with "
3859                                  "both data=journal and dioread_nolock");
3860                         goto failed_mount;
3861                 }
3862                 if (test_opt(sb, DAX)) {
3863                         ext4_msg(sb, KERN_ERR, "can't mount with "
3864                                  "both data=journal and dax");
3865                         goto failed_mount;
3866                 }
3867                 if (ext4_has_feature_encrypt(sb)) {
3868                         ext4_msg(sb, KERN_WARNING,
3869                                  "encrypted files will use data=ordered "
3870                                  "instead of data journaling mode");
3871                 }
3872                 if (test_opt(sb, DELALLOC))
3873                         clear_opt(sb, DELALLOC);
3874         } else {
3875                 sb->s_iflags |= SB_I_CGROUPWB;
3876         }
3877
3878         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3879                 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
3880
3881         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3882             (ext4_has_compat_features(sb) ||
3883              ext4_has_ro_compat_features(sb) ||
3884              ext4_has_incompat_features(sb)))
3885                 ext4_msg(sb, KERN_WARNING,
3886                        "feature flags set on rev 0 fs, "
3887                        "running e2fsck is recommended");
3888
3889         if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3890                 set_opt2(sb, HURD_COMPAT);
3891                 if (ext4_has_feature_64bit(sb)) {
3892                         ext4_msg(sb, KERN_ERR,
3893                                  "The Hurd can't support 64-bit file systems");
3894                         goto failed_mount;
3895                 }
3896
3897                 /*
3898                  * ea_inode feature uses l_i_version field which is not
3899                  * available in HURD_COMPAT mode.
3900                  */
3901                 if (ext4_has_feature_ea_inode(sb)) {
3902                         ext4_msg(sb, KERN_ERR,
3903                                  "ea_inode feature is not supported for Hurd");
3904                         goto failed_mount;
3905                 }
3906         }
3907
3908         if (IS_EXT2_SB(sb)) {
3909                 if (ext2_feature_set_ok(sb))
3910                         ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3911                                  "using the ext4 subsystem");
3912                 else {
3913                         /*
3914                          * If we're probing be silent, if this looks like
3915                          * it's actually an ext[34] filesystem.
3916                          */
3917                         if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3918                                 goto failed_mount;
3919                         ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3920                                  "to feature incompatibilities");
3921                         goto failed_mount;
3922                 }
3923         }
3924
3925         if (IS_EXT3_SB(sb)) {
3926                 if (ext3_feature_set_ok(sb))
3927                         ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3928                                  "using the ext4 subsystem");
3929                 else {
3930                         /*
3931                          * If we're probing be silent, if this looks like
3932                          * it's actually an ext4 filesystem.
3933                          */
3934                         if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3935                                 goto failed_mount;
3936                         ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3937                                  "to feature incompatibilities");
3938                         goto failed_mount;
3939                 }
3940         }
3941
3942         /*
3943          * Check feature flags regardless of the revision level, since we
3944          * previously didn't change the revision level when setting the flags,
3945          * so there is a chance incompat flags are set on a rev 0 filesystem.
3946          */
3947         if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
3948                 goto failed_mount;
3949
3950         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3951         if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3952             blocksize > EXT4_MAX_BLOCK_SIZE) {
3953                 ext4_msg(sb, KERN_ERR,
3954                        "Unsupported filesystem blocksize %d (%d log_block_size)",
3955                          blocksize, le32_to_cpu(es->s_log_block_size));
3956                 goto failed_mount;
3957         }
3958         if (le32_to_cpu(es->s_log_block_size) >
3959             (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3960                 ext4_msg(sb, KERN_ERR,
3961                          "Invalid log block size: %u",
3962                          le32_to_cpu(es->s_log_block_size));
3963                 goto failed_mount;
3964         }
3965         if (le32_to_cpu(es->s_log_cluster_size) >
3966             (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3967                 ext4_msg(sb, KERN_ERR,
3968                          "Invalid log cluster size: %u",
3969                          le32_to_cpu(es->s_log_cluster_size));
3970                 goto failed_mount;
3971         }
3972
3973         if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3974                 ext4_msg(sb, KERN_ERR,
3975                          "Number of reserved GDT blocks insanely large: %d",
3976                          le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3977                 goto failed_mount;
3978         }
3979
3980         if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3981                 if (ext4_has_feature_inline_data(sb)) {
3982                         ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
3983                                         " that may contain inline data");
3984                         goto failed_mount;
3985                 }
3986                 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
3987                         ext4_msg(sb, KERN_ERR,
3988                                 "DAX unsupported by block device.");
3989                         goto failed_mount;
3990                 }
3991         }
3992
3993         if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
3994                 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3995                          es->s_encryption_level);
3996                 goto failed_mount;
3997         }
3998
3999         if (sb->s_blocksize != blocksize) {
4000                 /* Validate the filesystem blocksize */
4001                 if (!sb_set_blocksize(sb, blocksize)) {
4002                         ext4_msg(sb, KERN_ERR, "bad block size %d",
4003                                         blocksize);
4004                         goto failed_mount;
4005                 }
4006
4007                 brelse(bh);
4008                 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
4009                 offset = do_div(logical_sb_block, blocksize);
4010                 bh = sb_bread_unmovable(sb, logical_sb_block);
4011                 if (!bh) {
4012                         ext4_msg(sb, KERN_ERR,
4013                                "Can't read superblock on 2nd try");
4014                         goto failed_mount;
4015                 }
4016                 es = (struct ext4_super_block *)(bh->b_data + offset);
4017                 sbi->s_es = es;
4018                 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
4019                         ext4_msg(sb, KERN_ERR,
4020                                "Magic mismatch, very weird!");
4021                         goto failed_mount;
4022                 }
4023         }
4024
4025         has_huge_files = ext4_has_feature_huge_file(sb);
4026         sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
4027                                                       has_huge_files);
4028         sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
4029
4030         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
4031                 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
4032                 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
4033         } else {
4034                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
4035                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
4036                 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
4037                         ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
4038                                  sbi->s_first_ino);
4039                         goto failed_mount;
4040                 }
4041                 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
4042                     (!is_power_of_2(sbi->s_inode_size)) ||
4043                     (sbi->s_inode_size > blocksize)) {
4044                         ext4_msg(sb, KERN_ERR,
4045                                "unsupported inode size: %d",
4046                                sbi->s_inode_size);
4047                         goto failed_mount;
4048                 }
4049                 /*
4050                  * i_atime_extra is the last extra field available for [acm]times in
4051                  * struct ext4_inode. Checking for that field should suffice to ensure
4052                  * we have extra space for all three.
4053                  */
4054                 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
4055                         sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
4056                         sb->s_time_gran = 1;
4057                         sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
4058                 } else {
4059                         sb->s_time_gran = NSEC_PER_SEC;
4060                         sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
4061                 }
4062
4063                 sb->s_time_min = EXT4_TIMESTAMP_MIN;
4064         }
4065
4066         sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
4067         if (ext4_has_feature_64bit(sb)) {
4068                 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
4069                     sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
4070                     !is_power_of_2(sbi->s_desc_size)) {
4071                         ext4_msg(sb, KERN_ERR,
4072                                "unsupported descriptor size %lu",
4073                                sbi->s_desc_size);
4074                         goto failed_mount;
4075                 }
4076         } else
4077                 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
4078
4079         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
4080         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
4081
4082         sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
4083         if (sbi->s_inodes_per_block == 0)
4084                 goto cantfind_ext4;
4085         if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
4086             sbi->s_inodes_per_group > blocksize * 8) {
4087                 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
4088                          sbi->s_blocks_per_group);
4089                 goto failed_mount;
4090         }
4091         sbi->s_itb_per_group = sbi->s_inodes_per_group /
4092                                         sbi->s_inodes_per_block;
4093         sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
4094         sbi->s_sbh = bh;
4095         sbi->s_mount_state = le16_to_cpu(es->s_state);
4096         sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
4097         sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
4098
4099         for (i = 0; i < 4; i++)
4100                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
4101         sbi->s_def_hash_version = es->s_def_hash_version;
4102         if (ext4_has_feature_dir_index(sb)) {
4103                 i = le32_to_cpu(es->s_flags);
4104                 if (i & EXT2_FLAGS_UNSIGNED_HASH)
4105                         sbi->s_hash_unsigned = 3;
4106                 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
4107 #ifdef __CHAR_UNSIGNED__
4108                         if (!sb_rdonly(sb))
4109                                 es->s_flags |=
4110                                         cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
4111                         sbi->s_hash_unsigned = 3;
4112 #else
4113                         if (!sb_rdonly(sb))
4114                                 es->s_flags |=
4115                                         cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
4116 #endif
4117                 }
4118         }
4119
4120         /* Handle clustersize */
4121         clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
4122         has_bigalloc = ext4_has_feature_bigalloc(sb);
4123         if (has_bigalloc) {
4124                 if (clustersize < blocksize) {
4125                         ext4_msg(sb, KERN_ERR,
4126                                  "cluster size (%d) smaller than "
4127                                  "block size (%d)", clustersize, blocksize);
4128                         goto failed_mount;
4129                 }
4130                 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4131                         le32_to_cpu(es->s_log_block_size);
4132                 sbi->s_clusters_per_group =
4133                         le32_to_cpu(es->s_clusters_per_group);
4134                 if (sbi->s_clusters_per_group > blocksize * 8) {
4135                         ext4_msg(sb, KERN_ERR,
4136                                  "#clusters per group too big: %lu",
4137                                  sbi->s_clusters_per_group);
4138                         goto failed_mount;
4139                 }
4140                 if (sbi->s_blocks_per_group !=
4141                     (sbi->s_clusters_per_group * (clustersize / blocksize))) {
4142                         ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4143                                  "clusters per group (%lu) inconsistent",
4144                                  sbi->s_blocks_per_group,
4145                                  sbi->s_clusters_per_group);
4146                         goto failed_mount;
4147                 }
4148         } else {
4149                 if (clustersize != blocksize) {
4150                         ext4_msg(sb, KERN_ERR,
4151                                  "fragment/cluster size (%d) != "
4152                                  "block size (%d)", clustersize, blocksize);
4153                         goto failed_mount;
4154                 }
4155                 if (sbi->s_blocks_per_group > blocksize * 8) {
4156                         ext4_msg(sb, KERN_ERR,
4157                                  "#blocks per group too big: %lu",
4158                                  sbi->s_blocks_per_group);
4159                         goto failed_mount;
4160                 }
4161                 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4162                 sbi->s_cluster_bits = 0;
4163         }
4164         sbi->s_cluster_ratio = clustersize / blocksize;
4165
4166         /* Do we have standard group size of clustersize * 8 blocks ? */
4167         if (sbi->s_blocks_per_group == clustersize << 3)
4168                 set_opt2(sb, STD_GROUP_SIZE);
4169
4170         /*
4171          * Test whether we have more sectors than will fit in sector_t,
4172          * and whether the max offset is addressable by the page cache.
4173          */
4174         err = generic_check_addressable(sb->s_blocksize_bits,
4175                                         ext4_blocks_count(es));
4176         if (err) {
4177                 ext4_msg(sb, KERN_ERR, "filesystem"
4178                          " too large to mount safely on this system");
4179                 goto failed_mount;
4180         }
4181
4182         if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4183                 goto cantfind_ext4;
4184
4185         /* check blocks count against device size */
4186         blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
4187         if (blocks_count && ext4_blocks_count(es) > blocks_count) {
4188                 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4189                        "exceeds size of device (%llu blocks)",
4190                        ext4_blocks_count(es), blocks_count);
4191                 goto failed_mount;
4192         }
4193
4194         /*
4195          * It makes no sense for the first data block to be beyond the end
4196          * of the filesystem.
4197          */
4198         if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
4199                 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4200                          "block %u is beyond end of filesystem (%llu)",
4201                          le32_to_cpu(es->s_first_data_block),
4202                          ext4_blocks_count(es));
4203                 goto failed_mount;
4204         }
4205         if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4206             (sbi->s_cluster_ratio == 1)) {
4207                 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4208                          "block is 0 with a 1k block and cluster size");
4209                 goto failed_mount;
4210         }
4211
4212         blocks_count = (ext4_blocks_count(es) -
4213                         le32_to_cpu(es->s_first_data_block) +
4214                         EXT4_BLOCKS_PER_GROUP(sb) - 1);
4215         do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4216         if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
4217                 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4218                        "(block count %llu, first data block %u, "
4219                        "blocks per group %lu)", sbi->s_groups_count,
4220                        ext4_blocks_count(es),
4221                        le32_to_cpu(es->s_first_data_block),
4222                        EXT4_BLOCKS_PER_GROUP(sb));
4223                 goto failed_mount;
4224         }
4225         sbi->s_groups_count = blocks_count;
4226         sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4227                         (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
4228         if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4229             le32_to_cpu(es->s_inodes_count)) {
4230                 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4231                          le32_to_cpu(es->s_inodes_count),
4232                          ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4233                 ret = -EINVAL;
4234                 goto failed_mount;
4235         }
4236         db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4237                    EXT4_DESC_PER_BLOCK(sb);
4238         if (ext4_has_feature_meta_bg(sb)) {
4239                 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
4240                         ext4_msg(sb, KERN_WARNING,
4241                                  "first meta block group too large: %u "
4242                                  "(group descriptor block count %u)",
4243                                  le32_to_cpu(es->s_first_meta_bg), db_count);
4244                         goto failed_mount;
4245                 }
4246         }
4247         sbi->s_group_desc = kvmalloc_array(db_count,
4248                                            sizeof(struct buffer_head *),
4249                                            GFP_KERNEL);
4250         if (sbi->s_group_desc == NULL) {
4251                 ext4_msg(sb, KERN_ERR, "not enough memory");
4252                 ret = -ENOMEM;
4253                 goto failed_mount;
4254         }
4255
4256         bgl_lock_init(sbi->s_blockgroup_lock);
4257
4258         /* Pre-read the descriptors into the buffer cache */
4259         for (i = 0; i < db_count; i++) {
4260                 block = descriptor_loc(sb, logical_sb_block, i);
4261                 sb_breadahead(sb, block);
4262         }
4263
4264         for (i = 0; i < db_count; i++) {
4265                 block = descriptor_loc(sb, logical_sb_block, i);
4266                 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
4267                 if (!sbi->s_group_desc[i]) {
4268                         ext4_msg(sb, KERN_ERR,
4269                                "can't read group descriptor %d", i);
4270                         db_count = i;
4271                         goto failed_mount2;
4272                 }
4273         }
4274         sbi->s_gdb_count = db_count;
4275         if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
4276                 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
4277                 ret = -EFSCORRUPTED;
4278                 goto failed_mount2;
4279         }
4280
4281         timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
4282
4283         /* Register extent status tree shrinker */
4284         if (ext4_es_register_shrinker(sbi))
4285                 goto failed_mount3;
4286
4287         sbi->s_stripe = ext4_get_stripe_size(sbi);
4288         sbi->s_extent_max_zeroout_kb = 32;
4289
4290         /*
4291          * set up enough so that it can read an inode
4292          */
4293         sb->s_op = &ext4_sops;
4294         sb->s_export_op = &ext4_export_ops;
4295         sb->s_xattr = ext4_xattr_handlers;
4296 #ifdef CONFIG_FS_ENCRYPTION
4297         sb->s_cop = &ext4_cryptops;
4298 #endif
4299 #ifdef CONFIG_FS_VERITY
4300         sb->s_vop = &ext4_verityops;
4301 #endif
4302 #ifdef CONFIG_QUOTA
4303         sb->dq_op = &ext4_quota_operations;
4304         if (ext4_has_feature_quota(sb))
4305                 sb->s_qcop = &dquot_quotactl_sysfile_ops;
4306         else
4307                 sb->s_qcop = &ext4_qctl_operations;
4308         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
4309 #endif
4310         memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
4311
4312         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
4313         mutex_init(&sbi->s_orphan_lock);
4314
4315         sb->s_root = NULL;
4316
4317         needs_recovery = (es->s_last_orphan != 0 ||
4318                           ext4_has_feature_journal_needs_recovery(sb));
4319
4320         if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
4321                 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
4322                         goto failed_mount3a;
4323
4324         /*
4325          * The first inode we look at is the journal inode.  Don't try
4326          * root first: it may be modified in the journal!
4327          */
4328         if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4329                 err = ext4_load_journal(sb, es, journal_devnum);
4330                 if (err)
4331                         goto failed_mount3a;
4332         } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
4333                    ext4_has_feature_journal_needs_recovery(sb)) {
4334                 ext4_msg(sb, KERN_ERR, "required journal recovery "
4335                        "suppressed and not mounted read-only");
4336                 goto failed_mount_wq;
4337         } else {
4338                 /* Nojournal mode, all journal mount options are illegal */
4339                 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4340                         ext4_msg(sb, KERN_ERR, "can't mount with "
4341                                  "journal_checksum, fs mounted w/o journal");
4342                         goto failed_mount_wq;
4343                 }
4344                 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4345                         ext4_msg(sb, KERN_ERR, "can't mount with "
4346                                  "journal_async_commit, fs mounted w/o journal");
4347                         goto failed_mount_wq;
4348                 }
4349                 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4350                         ext4_msg(sb, KERN_ERR, "can't mount with "
4351                                  "commit=%lu, fs mounted w/o journal",
4352                                  sbi->s_commit_interval / HZ);
4353                         goto failed_mount_wq;
4354                 }
4355                 if (EXT4_MOUNT_DATA_FLAGS &
4356                     (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4357                         ext4_msg(sb, KERN_ERR, "can't mount with "
4358                                  "data=, fs mounted w/o journal");
4359                         goto failed_mount_wq;
4360                 }
4361                 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
4362                 clear_opt(sb, JOURNAL_CHECKSUM);
4363                 clear_opt(sb, DATA_FLAGS);
4364                 sbi->s_journal = NULL;
4365                 needs_recovery = 0;
4366                 goto no_journal;
4367         }
4368
4369         if (ext4_has_feature_64bit(sb) &&
4370             !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4371                                        JBD2_FEATURE_INCOMPAT_64BIT)) {
4372                 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4373                 goto failed_mount_wq;
4374         }
4375
4376         if (!set_journal_csum_feature_set(sb)) {
4377                 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4378                          "feature set");
4379                 goto failed_mount_wq;
4380         }
4381
4382         /* We have now updated the journal if required, so we can
4383          * validate the data journaling mode. */
4384         switch (test_opt(sb, DATA_FLAGS)) {
4385         case 0:
4386                 /* No mode set, assume a default based on the journal
4387                  * capabilities: ORDERED_DATA if the journal can
4388                  * cope, else JOURNAL_DATA
4389                  */
4390                 if (jbd2_journal_check_available_features
4391                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4392                         set_opt(sb, ORDERED_DATA);
4393                         sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4394                 } else {
4395                         set_opt(sb, JOURNAL_DATA);
4396                         sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4397                 }
4398                 break;
4399
4400         case EXT4_MOUNT_ORDERED_DATA:
4401         case EXT4_MOUNT_WRITEBACK_DATA:
4402                 if (!jbd2_journal_check_available_features
4403                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4404                         ext4_msg(sb, KERN_ERR, "Journal does not support "
4405                                "requested data journaling mode");
4406                         goto failed_mount_wq;
4407                 }
4408         default:
4409                 break;
4410         }
4411
4412         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4413             test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4414                 ext4_msg(sb, KERN_ERR, "can't mount with "
4415                         "journal_async_commit in data=ordered mode");
4416                 goto failed_mount_wq;
4417         }
4418
4419         set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4420
4421         sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4422
4423 no_journal:
4424         if (!test_opt(sb, NO_MBCACHE)) {
4425                 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4426                 if (!sbi->s_ea_block_cache) {
4427                         ext4_msg(sb, KERN_ERR,
4428                                  "Failed to create ea_block_cache");
4429                         goto failed_mount_wq;
4430                 }
4431
4432                 if (ext4_has_feature_ea_inode(sb)) {
4433                         sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4434                         if (!sbi->s_ea_inode_cache) {
4435                                 ext4_msg(sb, KERN_ERR,
4436                                          "Failed to create ea_inode_cache");
4437                                 goto failed_mount_wq;
4438                         }
4439                 }
4440         }
4441
4442         if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
4443             (blocksize != PAGE_SIZE)) {
4444                 ext4_msg(sb, KERN_ERR,
4445                          "Unsupported blocksize for fs encryption");
4446                 goto failed_mount_wq;
4447         }
4448
4449         if (ext4_has_feature_verity(sb) && blocksize != PAGE_SIZE) {
4450                 ext4_msg(sb, KERN_ERR, "Unsupported blocksize for fs-verity");
4451                 goto failed_mount_wq;
4452         }
4453
4454         if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
4455             !ext4_has_feature_encrypt(sb)) {
4456                 ext4_set_feature_encrypt(sb);
4457                 ext4_commit_super(sb, 1);
4458         }
4459
4460         /*
4461          * Get the # of file system overhead blocks from the
4462          * superblock if present.
4463          */
4464         if (es->s_overhead_clusters)
4465                 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4466         else {
4467                 err = ext4_calculate_overhead(sb);
4468                 if (err)
4469                         goto failed_mount_wq;
4470         }
4471
4472         /*
4473          * The maximum number of concurrent works can be high and
4474          * concurrency isn't really necessary.  Limit it to 1.
4475          */
4476         EXT4_SB(sb)->rsv_conversion_wq =
4477                 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4478         if (!EXT4_SB(sb)->rsv_conversion_wq) {
4479                 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
4480                 ret = -ENOMEM;
4481                 goto failed_mount4;
4482         }
4483
4484         /*
4485          * The jbd2_journal_load will have done any necessary log recovery,
4486          * so we can safely mount the rest of the filesystem now.
4487          */
4488
4489         root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
4490         if (IS_ERR(root)) {
4491                 ext4_msg(sb, KERN_ERR, "get root inode failed");
4492                 ret = PTR_ERR(root);
4493                 root = NULL;
4494                 goto failed_mount4;
4495         }
4496         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4497                 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
4498                 iput(root);
4499                 goto failed_mount4;
4500         }
4501
4502 #ifdef CONFIG_UNICODE
4503         if (sbi->s_encoding)
4504                 sb->s_d_op = &ext4_dentry_ops;
4505 #endif
4506
4507         sb->s_root = d_make_root(root);
4508         if (!sb->s_root) {
4509                 ext4_msg(sb, KERN_ERR, "get root dentry failed");
4510                 ret = -ENOMEM;
4511                 goto failed_mount4;
4512         }
4513
4514         ret = ext4_setup_super(sb, es, sb_rdonly(sb));
4515         if (ret == -EROFS) {
4516                 sb->s_flags |= SB_RDONLY;
4517                 ret = 0;
4518         } else if (ret)
4519                 goto failed_mount4a;
4520
4521         ext4_clamp_want_extra_isize(sb);
4522
4523         ext4_set_resv_clusters(sb);
4524
4525         err = ext4_setup_system_zone(sb);
4526         if (err) {
4527                 ext4_msg(sb, KERN_ERR, "failed to initialize system "
4528                          "zone (%d)", err);
4529                 goto failed_mount4a;
4530         }
4531
4532         ext4_ext_init(sb);
4533         err = ext4_mb_init(sb);
4534         if (err) {
4535                 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4536                          err);
4537                 goto failed_mount5;
4538         }
4539
4540         block = ext4_count_free_clusters(sb);
4541         ext4_free_blocks_count_set(sbi->s_es,
4542                                    EXT4_C2B(sbi, block));
4543         ext4_superblock_csum_set(sb);
4544         err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4545                                   GFP_KERNEL);
4546         if (!err) {
4547                 unsigned long freei = ext4_count_free_inodes(sb);
4548                 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4549                 ext4_superblock_csum_set(sb);
4550                 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4551                                           GFP_KERNEL);
4552         }
4553         if (!err)
4554                 err = percpu_counter_init(&sbi->s_dirs_counter,
4555                                           ext4_count_dirs(sb), GFP_KERNEL);
4556         if (!err)
4557                 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4558                                           GFP_KERNEL);
4559         if (!err)
4560                 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4561
4562         if (err) {
4563                 ext4_msg(sb, KERN_ERR, "insufficient memory");
4564                 goto failed_mount6;
4565         }
4566
4567         if (ext4_has_feature_flex_bg(sb))
4568                 if (!ext4_fill_flex_info(sb)) {
4569                         ext4_msg(sb, KERN_ERR,
4570                                "unable to initialize "
4571                                "flex_bg meta info!");
4572                         goto failed_mount6;
4573                 }
4574
4575         err = ext4_register_li_request(sb, first_not_zeroed);
4576         if (err)
4577                 goto failed_mount6;
4578
4579         err = ext4_register_sysfs(sb);
4580         if (err)
4581                 goto failed_mount7;
4582
4583 #ifdef CONFIG_QUOTA
4584         /* Enable quota usage during mount. */
4585         if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
4586                 err = ext4_enable_quotas(sb);
4587                 if (err)
4588                         goto failed_mount8;
4589         }
4590 #endif  /* CONFIG_QUOTA */
4591
4592         EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4593         ext4_orphan_cleanup(sb, es);
4594         EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4595         if (needs_recovery) {
4596                 ext4_msg(sb, KERN_INFO, "recovery complete");
4597                 ext4_mark_recovery_complete(sb, es);
4598         }
4599         if (EXT4_SB(sb)->s_journal) {
4600                 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4601                         descr = " journalled data mode";
4602                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4603                         descr = " ordered data mode";
4604                 else
4605                         descr = " writeback data mode";
4606         } else
4607                 descr = "out journal";
4608
4609         if (test_opt(sb, DISCARD)) {
4610                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4611                 if (!blk_queue_discard(q))
4612                         ext4_msg(sb, KERN_WARNING,
4613                                  "mounting with \"discard\" option, but "
4614                                  "the device does not support discard");
4615         }
4616
4617         if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4618                 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4619                          "Opts: %.*s%s%s", descr,
4620                          (int) sizeof(sbi->s_es->s_mount_opts),
4621                          sbi->s_es->s_mount_opts,
4622                          *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4623
4624         if (es->s_error_count)
4625                 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4626
4627         /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4628         ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4629         ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4630         ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4631
4632         kfree(orig_data);
4633         return 0;
4634
4635 cantfind_ext4:
4636         if (!silent)
4637                 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4638         goto failed_mount;
4639
4640 #ifdef CONFIG_QUOTA
4641 failed_mount8:
4642         ext4_unregister_sysfs(sb);
4643 #endif
4644 failed_mount7:
4645         ext4_unregister_li_request(sb);
4646 failed_mount6:
4647         ext4_mb_release(sb);
4648         if (sbi->s_flex_groups)
4649                 kvfree(sbi->s_flex_groups);
4650         percpu_counter_destroy(&sbi->s_freeclusters_counter);
4651         percpu_counter_destroy(&sbi->s_freeinodes_counter);
4652         percpu_counter_destroy(&sbi->s_dirs_counter);
4653         percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4654         percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
4655 failed_mount5:
4656         ext4_ext_release(sb);
4657         ext4_release_system_zone(sb);
4658 failed_mount4a:
4659         dput(sb->s_root);
4660         sb->s_root = NULL;
4661 failed_mount4:
4662         ext4_msg(sb, KERN_ERR, "mount failed");
4663         if (EXT4_SB(sb)->rsv_conversion_wq)
4664                 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4665 failed_mount_wq:
4666         ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4667         sbi->s_ea_inode_cache = NULL;
4668
4669         ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4670         sbi->s_ea_block_cache = NULL;
4671
4672         if (sbi->s_journal) {
4673                 jbd2_journal_destroy(sbi->s_journal);
4674                 sbi->s_journal = NULL;
4675         }
4676 failed_mount3a:
4677         ext4_es_unregister_shrinker(sbi);
4678 failed_mount3:
4679         del_timer_sync(&sbi->s_err_report);
4680         if (sbi->s_mmp_tsk)
4681                 kthread_stop(sbi->s_mmp_tsk);
4682 failed_mount2:
4683         for (i = 0; i < db_count; i++)
4684                 brelse(sbi->s_group_desc[i]);
4685         kvfree(sbi->s_group_desc);
4686 failed_mount:
4687         if (sbi->s_chksum_driver)
4688                 crypto_free_shash(sbi->s_chksum_driver);
4689
4690 #ifdef CONFIG_UNICODE
4691         utf8_unload(sbi->s_encoding);
4692 #endif
4693
4694 #ifdef CONFIG_QUOTA
4695         for (i = 0; i < EXT4_MAXQUOTAS; i++)
4696                 kfree(get_qf_name(sb, sbi, i));
4697 #endif
4698         ext4_blkdev_remove(sbi);
4699         brelse(bh);
4700 out_fail:
4701         sb->s_fs_info = NULL;
4702         kfree(sbi->s_blockgroup_lock);
4703 out_free_base:
4704         kfree(sbi);
4705         kfree(orig_data);
4706         fs_put_dax(dax_dev);
4707         return err ? err : ret;
4708 }
4709
4710 /*
4711  * Setup any per-fs journal parameters now.  We'll do this both on
4712  * initial mount, once the journal has been initialised but before we've
4713  * done any recovery; and again on any subsequent remount.
4714  */
4715 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4716 {
4717         struct ext4_sb_info *sbi = EXT4_SB(sb);
4718
4719         journal->j_commit_interval = sbi->s_commit_interval;
4720         journal->j_min_batch_time = sbi->s_min_batch_time;
4721         journal->j_max_batch_time = sbi->s_max_batch_time;
4722
4723         write_lock(&journal->j_state_lock);
4724         if (test_opt(sb, BARRIER))
4725                 journal->j_flags |= JBD2_BARRIER;
4726         else
4727                 journal->j_flags &= ~JBD2_BARRIER;
4728         if (test_opt(sb, DATA_ERR_ABORT))
4729                 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4730         else
4731                 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4732         write_unlock(&journal->j_state_lock);
4733 }
4734
4735 static struct inode *ext4_get_journal_inode(struct super_block *sb,
4736                                              unsigned int journal_inum)
4737 {
4738         struct inode *journal_inode;
4739
4740         /*
4741          * Test for the existence of a valid inode on disk.  Bad things
4742          * happen if we iget() an unused inode, as the subsequent iput()
4743          * will try to delete it.
4744          */
4745         journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
4746         if (IS_ERR(journal_inode)) {
4747                 ext4_msg(sb, KERN_ERR, "no journal found");
4748                 return NULL;
4749         }
4750         if (!journal_inode->i_nlink) {
4751                 make_bad_inode(journal_inode);
4752                 iput(journal_inode);
4753                 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4754                 return NULL;
4755         }
4756
4757         jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4758                   journal_inode, journal_inode->i_size);
4759         if (!S_ISREG(journal_inode->i_mode)) {
4760                 ext4_msg(sb, KERN_ERR, "invalid journal inode");
4761                 iput(journal_inode);
4762                 return NULL;
4763         }
4764         return journal_inode;
4765 }
4766
4767 static journal_t *ext4_get_journal(struct super_block *sb,
4768                                    unsigned int journal_inum)
4769 {
4770         struct inode *journal_inode;
4771         journal_t *journal;
4772
4773         BUG_ON(!ext4_has_feature_journal(sb));
4774
4775         journal_inode = ext4_get_journal_inode(sb, journal_inum);
4776         if (!journal_inode)
4777                 return NULL;
4778
4779         journal = jbd2_journal_init_inode(journal_inode);
4780         if (!journal) {
4781                 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4782                 iput(journal_inode);
4783                 return NULL;
4784         }
4785         journal->j_private = sb;
4786         ext4_init_journal_params(sb, journal);
4787         return journal;
4788 }
4789
4790 static journal_t *ext4_get_dev_journal(struct super_block *sb,
4791                                        dev_t j_dev)
4792 {
4793         struct buffer_head *bh;
4794         journal_t *journal;
4795         ext4_fsblk_t start;
4796         ext4_fsblk_t len;
4797         int hblock, blocksize;
4798         ext4_fsblk_t sb_block;
4799         unsigned long offset;
4800         struct ext4_super_block *es;
4801         struct block_device *bdev;
4802
4803         BUG_ON(!ext4_has_feature_journal(sb));
4804
4805         bdev = ext4_blkdev_get(j_dev, sb);
4806         if (bdev == NULL)
4807                 return NULL;
4808
4809         blocksize = sb->s_blocksize;
4810         hblock = bdev_logical_block_size(bdev);
4811         if (blocksize < hblock) {
4812                 ext4_msg(sb, KERN_ERR,
4813                         "blocksize too small for journal device");
4814                 goto out_bdev;
4815         }
4816
4817         sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4818         offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4819         set_blocksize(bdev, blocksize);
4820         if (!(bh = __bread(bdev, sb_block, blocksize))) {
4821                 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4822                        "external journal");
4823                 goto out_bdev;
4824         }
4825
4826         es = (struct ext4_super_block *) (bh->b_data + offset);
4827         if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4828             !(le32_to_cpu(es->s_feature_incompat) &
4829               EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4830                 ext4_msg(sb, KERN_ERR, "external journal has "
4831                                         "bad superblock");
4832                 brelse(bh);
4833                 goto out_bdev;
4834         }
4835
4836         if ((le32_to_cpu(es->s_feature_ro_compat) &
4837              EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4838             es->s_checksum != ext4_superblock_csum(sb, es)) {
4839                 ext4_msg(sb, KERN_ERR, "external journal has "
4840                                        "corrupt superblock");
4841                 brelse(bh);
4842                 goto out_bdev;
4843         }
4844
4845         if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4846                 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4847                 brelse(bh);
4848                 goto out_bdev;
4849         }
4850
4851         len = ext4_blocks_count(es);
4852         start = sb_block + 1;
4853         brelse(bh);     /* we're done with the superblock */
4854
4855         journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4856                                         start, len, blocksize);
4857         if (!journal) {
4858                 ext4_msg(sb, KERN_ERR, "failed to create device journal");
4859                 goto out_bdev;
4860         }
4861         journal->j_private = sb;
4862         ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4863         wait_on_buffer(journal->j_sb_buffer);
4864         if (!buffer_uptodate(journal->j_sb_buffer)) {
4865                 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4866                 goto out_journal;
4867         }
4868         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4869                 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4870                                         "user (unsupported) - %d",
4871                         be32_to_cpu(journal->j_superblock->s_nr_users));
4872                 goto out_journal;
4873         }
4874         EXT4_SB(sb)->journal_bdev = bdev;
4875         ext4_init_journal_params(sb, journal);
4876         return journal;
4877
4878 out_journal:
4879         jbd2_journal_destroy(journal);
4880 out_bdev:
4881         ext4_blkdev_put(bdev);
4882         return NULL;
4883 }
4884
4885 static int ext4_load_journal(struct super_block *sb,
4886                              struct ext4_super_block *es,
4887                              unsigned long journal_devnum)
4888 {
4889         journal_t *journal;
4890         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4891         dev_t journal_dev;
4892         int err = 0;
4893         int really_read_only;
4894
4895         BUG_ON(!ext4_has_feature_journal(sb));
4896
4897         if (journal_devnum &&
4898             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4899                 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4900                         "numbers have changed");
4901                 journal_dev = new_decode_dev(journal_devnum);
4902         } else
4903                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4904
4905         really_read_only = bdev_read_only(sb->s_bdev);
4906
4907         /*
4908          * Are we loading a blank journal or performing recovery after a
4909          * crash?  For recovery, we need to check in advance whether we
4910          * can get read-write access to the device.
4911          */
4912         if (ext4_has_feature_journal_needs_recovery(sb)) {
4913                 if (sb_rdonly(sb)) {
4914                         ext4_msg(sb, KERN_INFO, "INFO: recovery "
4915                                         "required on readonly filesystem");
4916                         if (really_read_only) {
4917                                 ext4_msg(sb, KERN_ERR, "write access "
4918                                         "unavailable, cannot proceed "
4919                                         "(try mounting with noload)");
4920                                 return -EROFS;
4921                         }
4922                         ext4_msg(sb, KERN_INFO, "write access will "
4923                                "be enabled during recovery");
4924                 }
4925         }
4926
4927         if (journal_inum && journal_dev) {
4928                 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4929                        "and inode journals!");
4930                 return -EINVAL;
4931         }
4932
4933         if (journal_inum) {
4934                 if (!(journal = ext4_get_journal(sb, journal_inum)))
4935                         return -EINVAL;
4936         } else {
4937                 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4938                         return -EINVAL;
4939         }
4940
4941         if (!(journal->j_flags & JBD2_BARRIER))
4942                 ext4_msg(sb, KERN_INFO, "barriers disabled");
4943
4944         if (!ext4_has_feature_journal_needs_recovery(sb))
4945                 err = jbd2_journal_wipe(journal, !really_read_only);
4946         if (!err) {
4947                 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4948                 if (save)
4949                         memcpy(save, ((char *) es) +
4950                                EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4951                 err = jbd2_journal_load(journal);
4952                 if (save)
4953                         memcpy(((char *) es) + EXT4_S_ERR_START,
4954                                save, EXT4_S_ERR_LEN);
4955                 kfree(save);
4956         }
4957
4958         if (err) {
4959                 ext4_msg(sb, KERN_ERR, "error loading journal");
4960                 jbd2_journal_destroy(journal);
4961                 return err;
4962         }
4963
4964         EXT4_SB(sb)->s_journal = journal;
4965         ext4_clear_journal_err(sb, es);
4966
4967         if (!really_read_only && journal_devnum &&
4968             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4969                 es->s_journal_dev = cpu_to_le32(journal_devnum);
4970
4971                 /* Make sure we flush the recovery flag to disk. */
4972                 ext4_commit_super(sb, 1);
4973         }
4974
4975         return 0;
4976 }
4977
4978 static int ext4_commit_super(struct super_block *sb, int sync)
4979 {
4980         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4981         struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4982         int error = 0;
4983
4984         if (!sbh || block_device_ejected(sb))
4985                 return error;
4986
4987         /*
4988          * The superblock bh should be mapped, but it might not be if the
4989          * device was hot-removed. Not much we can do but fail the I/O.
4990          */
4991         if (!buffer_mapped(sbh))
4992                 return error;
4993
4994         /*
4995          * If the file system is mounted read-only, don't update the
4996          * superblock write time.  This avoids updating the superblock
4997          * write time when we are mounting the root file system
4998          * read/only but we need to replay the journal; at that point,
4999          * for people who are east of GMT and who make their clock
5000          * tick in localtime for Windows bug-for-bug compatibility,
5001          * the clock is set in the future, and this will cause e2fsck
5002          * to complain and force a full file system check.
5003          */
5004         if (!(sb->s_flags & SB_RDONLY))
5005                 ext4_update_tstamp(es, s_wtime);
5006         if (sb->s_bdev->bd_part)
5007                 es->s_kbytes_written =
5008                         cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
5009                             ((part_stat_read(sb->s_bdev->bd_part,
5010                                              sectors[STAT_WRITE]) -
5011                               EXT4_SB(sb)->s_sectors_written_start) >> 1));
5012         else
5013                 es->s_kbytes_written =
5014                         cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
5015         if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
5016                 ext4_free_blocks_count_set(es,
5017                         EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
5018                                 &EXT4_SB(sb)->s_freeclusters_counter)));
5019         if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
5020                 es->s_free_inodes_count =
5021                         cpu_to_le32(percpu_counter_sum_positive(
5022                                 &EXT4_SB(sb)->s_freeinodes_counter));
5023         BUFFER_TRACE(sbh, "marking dirty");
5024         ext4_superblock_csum_set(sb);
5025         if (sync)
5026                 lock_buffer(sbh);
5027         if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
5028                 /*
5029                  * Oh, dear.  A previous attempt to write the
5030                  * superblock failed.  This could happen because the
5031                  * USB device was yanked out.  Or it could happen to
5032                  * be a transient write error and maybe the block will
5033                  * be remapped.  Nothing we can do but to retry the
5034                  * write and hope for the best.
5035                  */
5036                 ext4_msg(sb, KERN_ERR, "previous I/O error to "
5037                        "superblock detected");
5038                 clear_buffer_write_io_error(sbh);
5039                 set_buffer_uptodate(sbh);
5040         }
5041         mark_buffer_dirty(sbh);
5042         if (sync) {
5043                 unlock_buffer(sbh);
5044                 error = __sync_dirty_buffer(sbh,
5045                         REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
5046                 if (buffer_write_io_error(sbh)) {
5047                         ext4_msg(sb, KERN_ERR, "I/O error while writing "
5048                                "superblock");
5049                         clear_buffer_write_io_error(sbh);
5050                         set_buffer_uptodate(sbh);
5051                 }
5052         }
5053         return error;
5054 }
5055
5056 /*
5057  * Have we just finished recovery?  If so, and if we are mounting (or
5058  * remounting) the filesystem readonly, then we will end up with a
5059  * consistent fs on disk.  Record that fact.
5060  */
5061 static void ext4_mark_recovery_complete(struct super_block *sb,
5062                                         struct ext4_super_block *es)
5063 {
5064         journal_t *journal = EXT4_SB(sb)->s_journal;
5065
5066         if (!ext4_has_feature_journal(sb)) {
5067                 BUG_ON(journal != NULL);
5068                 return;
5069         }
5070         jbd2_journal_lock_updates(journal);
5071         if (jbd2_journal_flush(journal) < 0)
5072                 goto out;
5073
5074         if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
5075                 ext4_clear_feature_journal_needs_recovery(sb);
5076                 ext4_commit_super(sb, 1);
5077         }
5078
5079 out:
5080         jbd2_journal_unlock_updates(journal);
5081 }
5082
5083 /*
5084  * If we are mounting (or read-write remounting) a filesystem whose journal
5085  * has recorded an error from a previous lifetime, move that error to the
5086  * main filesystem now.
5087  */
5088 static void ext4_clear_journal_err(struct super_block *sb,
5089                                    struct ext4_super_block *es)
5090 {
5091         journal_t *journal;
5092         int j_errno;
5093         const char *errstr;
5094
5095         BUG_ON(!ext4_has_feature_journal(sb));
5096
5097         journal = EXT4_SB(sb)->s_journal;
5098
5099         /*
5100          * Now check for any error status which may have been recorded in the
5101          * journal by a prior ext4_error() or ext4_abort()
5102          */
5103
5104         j_errno = jbd2_journal_errno(journal);
5105         if (j_errno) {
5106                 char nbuf[16];
5107
5108                 errstr = ext4_decode_error(sb, j_errno, nbuf);
5109                 ext4_warning(sb, "Filesystem error recorded "
5110                              "from previous mount: %s", errstr);
5111                 ext4_warning(sb, "Marking fs in need of filesystem check.");
5112
5113                 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
5114                 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
5115                 ext4_commit_super(sb, 1);
5116
5117                 jbd2_journal_clear_err(journal);
5118                 jbd2_journal_update_sb_errno(journal);
5119         }
5120 }
5121
5122 /*
5123  * Force the running and committing transactions to commit,
5124  * and wait on the commit.
5125  */
5126 int ext4_force_commit(struct super_block *sb)
5127 {
5128         journal_t *journal;
5129
5130         if (sb_rdonly(sb))
5131                 return 0;
5132
5133         journal = EXT4_SB(sb)->s_journal;
5134         return ext4_journal_force_commit(journal);
5135 }
5136
5137 static int ext4_sync_fs(struct super_block *sb, int wait)
5138 {
5139         int ret = 0;
5140         tid_t target;
5141         bool needs_barrier = false;
5142         struct ext4_sb_info *sbi = EXT4_SB(sb);
5143
5144         if (unlikely(ext4_forced_shutdown(sbi)))
5145                 return 0;
5146
5147         trace_ext4_sync_fs(sb, wait);
5148         flush_workqueue(sbi->rsv_conversion_wq);
5149         /*
5150          * Writeback quota in non-journalled quota case - journalled quota has
5151          * no dirty dquots
5152          */
5153         dquot_writeback_dquots(sb, -1);
5154         /*
5155          * Data writeback is possible w/o journal transaction, so barrier must
5156          * being sent at the end of the function. But we can skip it if
5157          * transaction_commit will do it for us.
5158          */
5159         if (sbi->s_journal) {
5160                 target = jbd2_get_latest_transaction(sbi->s_journal);
5161                 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
5162                     !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
5163                         needs_barrier = true;
5164
5165                 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
5166                         if (wait)
5167                                 ret = jbd2_log_wait_commit(sbi->s_journal,
5168                                                            target);
5169                 }
5170         } else if (wait && test_opt(sb, BARRIER))
5171                 needs_barrier = true;
5172         if (needs_barrier) {
5173                 int err;
5174                 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
5175                 if (!ret)
5176                         ret = err;
5177         }
5178
5179         return ret;
5180 }
5181
5182 /*
5183  * LVM calls this function before a (read-only) snapshot is created.  This
5184  * gives us a chance to flush the journal completely and mark the fs clean.
5185  *
5186  * Note that only this function cannot bring a filesystem to be in a clean
5187  * state independently. It relies on upper layer to stop all data & metadata
5188  * modifications.
5189  */
5190 static int ext4_freeze(struct super_block *sb)
5191 {
5192         int error = 0;
5193         journal_t *journal;
5194
5195         if (sb_rdonly(sb))
5196                 return 0;
5197
5198         journal = EXT4_SB(sb)->s_journal;
5199
5200         if (journal) {
5201                 /* Now we set up the journal barrier. */
5202                 jbd2_journal_lock_updates(journal);
5203
5204                 /*
5205                  * Don't clear the needs_recovery flag if we failed to
5206                  * flush the journal.
5207                  */
5208                 error = jbd2_journal_flush(journal);
5209                 if (error < 0)
5210                         goto out;
5211
5212                 /* Journal blocked and flushed, clear needs_recovery flag. */
5213                 ext4_clear_feature_journal_needs_recovery(sb);
5214         }
5215
5216         error = ext4_commit_super(sb, 1);
5217 out:
5218         if (journal)
5219                 /* we rely on upper layer to stop further updates */
5220                 jbd2_journal_unlock_updates(journal);
5221         return error;
5222 }
5223
5224 /*
5225  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
5226  * flag here, even though the filesystem is not technically dirty yet.
5227  */
5228 static int ext4_unfreeze(struct super_block *sb)
5229 {
5230         if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
5231                 return 0;
5232
5233         if (EXT4_SB(sb)->s_journal) {
5234                 /* Reset the needs_recovery flag before the fs is unlocked. */
5235                 ext4_set_feature_journal_needs_recovery(sb);
5236         }
5237
5238         ext4_commit_super(sb, 1);
5239         return 0;
5240 }
5241
5242 /*
5243  * Structure to save mount options for ext4_remount's benefit
5244  */
5245 struct ext4_mount_options {
5246         unsigned long s_mount_opt;
5247         unsigned long s_mount_opt2;
5248         kuid_t s_resuid;
5249         kgid_t s_resgid;
5250         unsigned long s_commit_interval;
5251         u32 s_min_batch_time, s_max_batch_time;
5252 #ifdef CONFIG_QUOTA
5253         int s_jquota_fmt;
5254         char *s_qf_names[EXT4_MAXQUOTAS];
5255 #endif
5256 };
5257
5258 static int ext4_remount(struct super_block *sb, int *flags, char *data)
5259 {
5260         struct ext4_super_block *es;
5261         struct ext4_sb_info *sbi = EXT4_SB(sb);
5262         unsigned long old_sb_flags;
5263         struct ext4_mount_options old_opts;
5264         int enable_quota = 0;
5265         ext4_group_t g;
5266         unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
5267         int err = 0;
5268 #ifdef CONFIG_QUOTA
5269         int i, j;
5270         char *to_free[EXT4_MAXQUOTAS];
5271 #endif
5272         char *orig_data = kstrdup(data, GFP_KERNEL);
5273
5274         if (data && !orig_data)
5275                 return -ENOMEM;
5276
5277         /* Store the original options */
5278         old_sb_flags = sb->s_flags;
5279         old_opts.s_mount_opt = sbi->s_mount_opt;
5280         old_opts.s_mount_opt2 = sbi->s_mount_opt2;
5281         old_opts.s_resuid = sbi->s_resuid;
5282         old_opts.s_resgid = sbi->s_resgid;
5283         old_opts.s_commit_interval = sbi->s_commit_interval;
5284         old_opts.s_min_batch_time = sbi->s_min_batch_time;
5285         old_opts.s_max_batch_time = sbi->s_max_batch_time;
5286 #ifdef CONFIG_QUOTA
5287         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
5288         for (i = 0; i < EXT4_MAXQUOTAS; i++)
5289                 if (sbi->s_qf_names[i]) {
5290                         char *qf_name = get_qf_name(sb, sbi, i);
5291
5292                         old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
5293                         if (!old_opts.s_qf_names[i]) {
5294                                 for (j = 0; j < i; j++)
5295                                         kfree(old_opts.s_qf_names[j]);
5296                                 kfree(orig_data);
5297                                 return -ENOMEM;
5298                         }
5299                 } else
5300                         old_opts.s_qf_names[i] = NULL;
5301 #endif
5302         if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5303                 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
5304
5305         if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
5306                 err = -EINVAL;
5307                 goto restore_opts;
5308         }
5309
5310         ext4_clamp_want_extra_isize(sb);
5311
5312         if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
5313             test_opt(sb, JOURNAL_CHECKSUM)) {
5314                 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
5315                          "during remount not supported; ignoring");
5316                 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
5317         }
5318
5319         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5320                 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5321                         ext4_msg(sb, KERN_ERR, "can't mount with "
5322                                  "both data=journal and delalloc");
5323                         err = -EINVAL;
5324                         goto restore_opts;
5325                 }
5326                 if (test_opt(sb, DIOREAD_NOLOCK)) {
5327                         ext4_msg(sb, KERN_ERR, "can't mount with "
5328                                  "both data=journal and dioread_nolock");
5329                         err = -EINVAL;
5330                         goto restore_opts;
5331                 }
5332                 if (test_opt(sb, DAX)) {
5333                         ext4_msg(sb, KERN_ERR, "can't mount with "
5334                                  "both data=journal and dax");
5335                         err = -EINVAL;
5336                         goto restore_opts;
5337                 }
5338         } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5339                 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5340                         ext4_msg(sb, KERN_ERR, "can't mount with "
5341                                 "journal_async_commit in data=ordered mode");
5342                         err = -EINVAL;
5343                         goto restore_opts;
5344                 }
5345         }
5346
5347         if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5348                 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5349                 err = -EINVAL;
5350                 goto restore_opts;
5351         }
5352
5353         if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
5354                 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
5355                         "dax flag with busy inodes while remounting");
5356                 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
5357         }
5358
5359         if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
5360                 ext4_abort(sb, "Abort forced by user");
5361
5362         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5363                 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
5364
5365         es = sbi->s_es;
5366
5367         if (sbi->s_journal) {
5368                 ext4_init_journal_params(sb, sbi->s_journal);
5369                 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5370         }
5371
5372         if (*flags & SB_LAZYTIME)
5373                 sb->s_flags |= SB_LAZYTIME;
5374
5375         if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
5376                 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
5377                         err = -EROFS;
5378                         goto restore_opts;
5379                 }
5380
5381                 if (*flags & SB_RDONLY) {
5382                         err = sync_filesystem(sb);
5383                         if (err < 0)
5384                                 goto restore_opts;
5385                         err = dquot_suspend(sb, -1);
5386                         if (err < 0)
5387                                 goto restore_opts;
5388
5389                         /*
5390                          * First of all, the unconditional stuff we have to do
5391                          * to disable replay of the journal when we next remount
5392                          */
5393                         sb->s_flags |= SB_RDONLY;
5394
5395                         /*
5396                          * OK, test if we are remounting a valid rw partition
5397                          * readonly, and if so set the rdonly flag and then
5398                          * mark the partition as valid again.
5399                          */
5400                         if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5401                             (sbi->s_mount_state & EXT4_VALID_FS))
5402                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
5403
5404                         if (sbi->s_journal)
5405                                 ext4_mark_recovery_complete(sb, es);
5406                         if (sbi->s_mmp_tsk)
5407                                 kthread_stop(sbi->s_mmp_tsk);
5408                 } else {
5409                         /* Make sure we can mount this feature set readwrite */
5410                         if (ext4_has_feature_readonly(sb) ||
5411                             !ext4_feature_set_ok(sb, 0)) {
5412                                 err = -EROFS;
5413                                 goto restore_opts;
5414                         }
5415                         /*
5416                          * Make sure the group descriptor checksums
5417                          * are sane.  If they aren't, refuse to remount r/w.
5418                          */
5419                         for (g = 0; g < sbi->s_groups_count; g++) {
5420                                 struct ext4_group_desc *gdp =
5421                                         ext4_get_group_desc(sb, g, NULL);
5422
5423                                 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
5424                                         ext4_msg(sb, KERN_ERR,
5425                "ext4_remount: Checksum for group %u failed (%u!=%u)",
5426                 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
5427                                                le16_to_cpu(gdp->bg_checksum));
5428                                         err = -EFSBADCRC;
5429                                         goto restore_opts;
5430                                 }
5431                         }
5432
5433                         /*
5434                          * If we have an unprocessed orphan list hanging
5435                          * around from a previously readonly bdev mount,
5436                          * require a full umount/remount for now.
5437                          */
5438                         if (es->s_last_orphan) {
5439                                 ext4_msg(sb, KERN_WARNING, "Couldn't "
5440                                        "remount RDWR because of unprocessed "
5441                                        "orphan inode list.  Please "
5442                                        "umount/remount instead");
5443                                 err = -EINVAL;
5444                                 goto restore_opts;
5445                         }
5446
5447                         /*
5448                          * Mounting a RDONLY partition read-write, so reread
5449                          * and store the current valid flag.  (It may have
5450                          * been changed by e2fsck since we originally mounted
5451                          * the partition.)
5452                          */
5453                         if (sbi->s_journal)
5454                                 ext4_clear_journal_err(sb, es);
5455                         sbi->s_mount_state = le16_to_cpu(es->s_state);
5456
5457                         err = ext4_setup_super(sb, es, 0);
5458                         if (err)
5459                                 goto restore_opts;
5460
5461                         sb->s_flags &= ~SB_RDONLY;
5462                         if (ext4_has_feature_mmp(sb))
5463                                 if (ext4_multi_mount_protect(sb,
5464                                                 le64_to_cpu(es->s_mmp_block))) {
5465                                         err = -EROFS;
5466                                         goto restore_opts;
5467                                 }
5468                         enable_quota = 1;
5469                 }
5470         }
5471
5472         /*
5473          * Reinitialize lazy itable initialization thread based on
5474          * current settings
5475          */
5476         if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
5477                 ext4_unregister_li_request(sb);
5478         else {
5479                 ext4_group_t first_not_zeroed;
5480                 first_not_zeroed = ext4_has_uninit_itable(sb);
5481                 ext4_register_li_request(sb, first_not_zeroed);
5482         }
5483
5484         ext4_setup_system_zone(sb);
5485         if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
5486                 err = ext4_commit_super(sb, 1);
5487                 if (err)
5488                         goto restore_opts;
5489         }
5490
5491 #ifdef CONFIG_QUOTA
5492         /* Release old quota file names */
5493         for (i = 0; i < EXT4_MAXQUOTAS; i++)
5494                 kfree(old_opts.s_qf_names[i]);
5495         if (enable_quota) {
5496                 if (sb_any_quota_suspended(sb))
5497                         dquot_resume(sb, -1);
5498                 else if (ext4_has_feature_quota(sb)) {
5499                         err = ext4_enable_quotas(sb);
5500                         if (err)
5501                                 goto restore_opts;
5502                 }
5503         }
5504 #endif
5505
5506         *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
5507         ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5508         kfree(orig_data);
5509         return 0;
5510
5511 restore_opts:
5512         sb->s_flags = old_sb_flags;
5513         sbi->s_mount_opt = old_opts.s_mount_opt;
5514         sbi->s_mount_opt2 = old_opts.s_mount_opt2;
5515         sbi->s_resuid = old_opts.s_resuid;
5516         sbi->s_resgid = old_opts.s_resgid;
5517         sbi->s_commit_interval = old_opts.s_commit_interval;
5518         sbi->s_min_batch_time = old_opts.s_min_batch_time;
5519         sbi->s_max_batch_time = old_opts.s_max_batch_time;
5520 #ifdef CONFIG_QUOTA
5521         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
5522         for (i = 0; i < EXT4_MAXQUOTAS; i++) {
5523                 to_free[i] = get_qf_name(sb, sbi, i);
5524                 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
5525         }
5526         synchronize_rcu();
5527         for (i = 0; i < EXT4_MAXQUOTAS; i++)
5528                 kfree(to_free[i]);
5529 #endif
5530         kfree(orig_data);
5531         return err;
5532 }
5533
5534 #ifdef CONFIG_QUOTA
5535 static int ext4_statfs_project(struct super_block *sb,
5536                                kprojid_t projid, struct kstatfs *buf)
5537 {
5538         struct kqid qid;
5539         struct dquot *dquot;
5540         u64 limit;
5541         u64 curblock;
5542
5543         qid = make_kqid_projid(projid);
5544         dquot = dqget(sb, qid);
5545         if (IS_ERR(dquot))
5546                 return PTR_ERR(dquot);
5547         spin_lock(&dquot->dq_dqb_lock);
5548
5549         limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5550                  dquot->dq_dqb.dqb_bsoftlimit :
5551                  dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5552         if (limit && buf->f_blocks > limit) {
5553                 curblock = (dquot->dq_dqb.dqb_curspace +
5554                             dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
5555                 buf->f_blocks = limit;
5556                 buf->f_bfree = buf->f_bavail =
5557                         (buf->f_blocks > curblock) ?
5558                          (buf->f_blocks - curblock) : 0;
5559         }
5560
5561         limit = dquot->dq_dqb.dqb_isoftlimit ?
5562                 dquot->dq_dqb.dqb_isoftlimit :
5563                 dquot->dq_dqb.dqb_ihardlimit;
5564         if (limit && buf->f_files > limit) {
5565                 buf->f_files = limit;
5566                 buf->f_ffree =
5567                         (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5568                          (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5569         }
5570
5571         spin_unlock(&dquot->dq_dqb_lock);
5572         dqput(dquot);
5573         return 0;
5574 }
5575 #endif
5576
5577 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5578 {
5579         struct super_block *sb = dentry->d_sb;
5580         struct ext4_sb_info *sbi = EXT4_SB(sb);
5581         struct ext4_super_block *es = sbi->s_es;
5582         ext4_fsblk_t overhead = 0, resv_blocks;
5583         u64 fsid;
5584         s64 bfree;
5585         resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5586
5587         if (!test_opt(sb, MINIX_DF))
5588                 overhead = sbi->s_overhead;
5589
5590         buf->f_type = EXT4_SUPER_MAGIC;
5591         buf->f_bsize = sb->s_blocksize;
5592         buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5593         bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5594                 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5595         /* prevent underflow in case that few free space is available */
5596         buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
5597         buf->f_bavail = buf->f_bfree -
5598                         (ext4_r_blocks_count(es) + resv_blocks);
5599         if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5600                 buf->f_bavail = 0;
5601         buf->f_files = le32_to_cpu(es->s_inodes_count);
5602         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5603         buf->f_namelen = EXT4_NAME_LEN;
5604         fsid = le64_to_cpup((void *)es->s_uuid) ^
5605                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5606         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5607         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
5608
5609 #ifdef CONFIG_QUOTA
5610         if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5611             sb_has_quota_limits_enabled(sb, PRJQUOTA))
5612                 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5613 #endif
5614         return 0;
5615 }
5616
5617
5618 #ifdef CONFIG_QUOTA
5619
5620 /*
5621  * Helper functions so that transaction is started before we acquire dqio_sem
5622  * to keep correct lock ordering of transaction > dqio_sem
5623  */
5624 static inline struct inode *dquot_to_inode(struct dquot *dquot)
5625 {
5626         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5627 }
5628
5629 static int ext4_write_dquot(struct dquot *dquot)
5630 {
5631         int ret, err;
5632         handle_t *handle;
5633         struct inode *inode;
5634
5635         inode = dquot_to_inode(dquot);
5636         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5637                                     EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5638         if (IS_ERR(handle))
5639                 return PTR_ERR(handle);
5640         ret = dquot_commit(dquot);
5641         err = ext4_journal_stop(handle);
5642         if (!ret)
5643                 ret = err;
5644         return ret;
5645 }
5646
5647 static int ext4_acquire_dquot(struct dquot *dquot)
5648 {
5649         int ret, err;
5650         handle_t *handle;
5651
5652         handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5653                                     EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5654         if (IS_ERR(handle))
5655                 return PTR_ERR(handle);
5656         ret = dquot_acquire(dquot);
5657         err = ext4_journal_stop(handle);
5658         if (!ret)
5659                 ret = err;
5660         return ret;
5661 }
5662
5663 static int ext4_release_dquot(struct dquot *dquot)
5664 {
5665         int ret, err;
5666         handle_t *handle;
5667
5668         handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5669                                     EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
5670         if (IS_ERR(handle)) {
5671                 /* Release dquot anyway to avoid endless cycle in dqput() */
5672                 dquot_release(dquot);
5673                 return PTR_ERR(handle);
5674         }
5675         ret = dquot_release(dquot);
5676         err = ext4_journal_stop(handle);
5677         if (!ret)
5678                 ret = err;
5679         return ret;
5680 }
5681
5682 static int ext4_mark_dquot_dirty(struct dquot *dquot)
5683 {
5684         struct super_block *sb = dquot->dq_sb;
5685         struct ext4_sb_info *sbi = EXT4_SB(sb);
5686
5687         /* Are we journaling quotas? */
5688         if (ext4_has_feature_quota(sb) ||
5689             sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5690                 dquot_mark_dquot_dirty(dquot);
5691                 return ext4_write_dquot(dquot);
5692         } else {
5693                 return dquot_mark_dquot_dirty(dquot);
5694         }
5695 }
5696
5697 static int ext4_write_info(struct super_block *sb, int type)
5698 {
5699         int ret, err;
5700         handle_t *handle;
5701
5702         /* Data block + inode block */
5703         handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
5704         if (IS_ERR(handle))
5705                 return PTR_ERR(handle);
5706         ret = dquot_commit_info(sb, type);
5707         err = ext4_journal_stop(handle);
5708         if (!ret)
5709                 ret = err;
5710         return ret;
5711 }
5712
5713 /*
5714  * Turn on quotas during mount time - we need to find
5715  * the quota file and such...
5716  */
5717 static int ext4_quota_on_mount(struct super_block *sb, int type)
5718 {
5719         return dquot_quota_on_mount(sb, get_qf_name(sb, EXT4_SB(sb), type),
5720                                         EXT4_SB(sb)->s_jquota_fmt, type);
5721 }
5722
5723 static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5724 {
5725         struct ext4_inode_info *ei = EXT4_I(inode);
5726
5727         /* The first argument of lockdep_set_subclass has to be
5728          * *exactly* the same as the argument to init_rwsem() --- in
5729          * this case, in init_once() --- or lockdep gets unhappy
5730          * because the name of the lock is set using the
5731          * stringification of the argument to init_rwsem().
5732          */
5733         (void) ei;      /* shut up clang warning if !CONFIG_LOCKDEP */
5734         lockdep_set_subclass(&ei->i_data_sem, subclass);
5735 }
5736
5737 /*
5738  * Standard function to be called on quota_on
5739  */
5740 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5741                          const struct path *path)
5742 {
5743         int err;
5744
5745         if (!test_opt(sb, QUOTA))
5746                 return -EINVAL;
5747
5748         /* Quotafile not on the same filesystem? */
5749         if (path->dentry->d_sb != sb)
5750                 return -EXDEV;
5751         /* Journaling quota? */
5752         if (EXT4_SB(sb)->s_qf_names[type]) {
5753                 /* Quotafile not in fs root? */
5754                 if (path->dentry->d_parent != sb->s_root)
5755                         ext4_msg(sb, KERN_WARNING,
5756                                 "Quota file not on filesystem root. "
5757                                 "Journaled quota will not work");
5758                 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5759         } else {
5760                 /*
5761                  * Clear the flag just in case mount options changed since
5762                  * last time.
5763                  */
5764                 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
5765         }
5766
5767         /*
5768          * When we journal data on quota file, we have to flush journal to see
5769          * all updates to the file when we bypass pagecache...
5770          */
5771         if (EXT4_SB(sb)->s_journal &&
5772             ext4_should_journal_data(d_inode(path->dentry))) {
5773                 /*
5774                  * We don't need to lock updates but journal_flush() could
5775                  * otherwise be livelocked...
5776                  */
5777                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5778                 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5779                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5780                 if (err)
5781                         return err;
5782         }
5783
5784         lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5785         err = dquot_quota_on(sb, type, format_id, path);
5786         if (err) {
5787                 lockdep_set_quota_inode(path->dentry->d_inode,
5788                                              I_DATA_SEM_NORMAL);
5789         } else {
5790                 struct inode *inode = d_inode(path->dentry);
5791                 handle_t *handle;
5792
5793                 /*
5794                  * Set inode flags to prevent userspace from messing with quota
5795                  * files. If this fails, we return success anyway since quotas
5796                  * are already enabled and this is not a hard failure.
5797                  */
5798                 inode_lock(inode);
5799                 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5800                 if (IS_ERR(handle))
5801                         goto unlock_inode;
5802                 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5803                 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5804                                 S_NOATIME | S_IMMUTABLE);
5805                 ext4_mark_inode_dirty(handle, inode);
5806                 ext4_journal_stop(handle);
5807         unlock_inode:
5808                 inode_unlock(inode);
5809         }
5810         return err;
5811 }
5812
5813 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5814                              unsigned int flags)
5815 {
5816         int err;
5817         struct inode *qf_inode;
5818         unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5819                 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5820                 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5821                 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5822         };
5823
5824         BUG_ON(!ext4_has_feature_quota(sb));
5825
5826         if (!qf_inums[type])
5827                 return -EPERM;
5828
5829         qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
5830         if (IS_ERR(qf_inode)) {
5831                 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5832                 return PTR_ERR(qf_inode);
5833         }
5834
5835         /* Don't account quota for quota files to avoid recursion */
5836         qf_inode->i_flags |= S_NOQUOTA;
5837         lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
5838         err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
5839         if (err)
5840                 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
5841         iput(qf_inode);
5842
5843         return err;
5844 }
5845
5846 /* Enable usage tracking for all quota types. */
5847 static int ext4_enable_quotas(struct super_block *sb)
5848 {
5849         int type, err = 0;
5850         unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5851                 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5852                 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5853                 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5854         };
5855         bool quota_mopt[EXT4_MAXQUOTAS] = {
5856                 test_opt(sb, USRQUOTA),
5857                 test_opt(sb, GRPQUOTA),
5858                 test_opt(sb, PRJQUOTA),
5859         };
5860
5861         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
5862         for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5863                 if (qf_inums[type]) {
5864                         err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5865                                 DQUOT_USAGE_ENABLED |
5866                                 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
5867                         if (err) {
5868                                 ext4_warning(sb,
5869                                         "Failed to enable quota tracking "
5870                                         "(type=%d, err=%d). Please run "
5871                                         "e2fsck to fix.", type, err);
5872                                 for (type--; type >= 0; type--)
5873                                         dquot_quota_off(sb, type);
5874
5875                                 return err;
5876                         }
5877                 }
5878         }
5879         return 0;
5880 }
5881
5882 static int ext4_quota_off(struct super_block *sb, int type)
5883 {
5884         struct inode *inode = sb_dqopt(sb)->files[type];
5885         handle_t *handle;
5886         int err;
5887
5888         /* Force all delayed allocation blocks to be allocated.
5889          * Caller already holds s_umount sem */
5890         if (test_opt(sb, DELALLOC))
5891                 sync_filesystem(sb);
5892
5893         if (!inode || !igrab(inode))
5894                 goto out;
5895
5896         err = dquot_quota_off(sb, type);
5897         if (err || ext4_has_feature_quota(sb))
5898                 goto out_put;
5899
5900         inode_lock(inode);
5901         /*
5902          * Update modification times of quota files when userspace can
5903          * start looking at them. If we fail, we return success anyway since
5904          * this is not a hard failure and quotas are already disabled.
5905          */
5906         handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5907         if (IS_ERR(handle))
5908                 goto out_unlock;
5909         EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5910         inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
5911         inode->i_mtime = inode->i_ctime = current_time(inode);
5912         ext4_mark_inode_dirty(handle, inode);
5913         ext4_journal_stop(handle);
5914 out_unlock:
5915         inode_unlock(inode);
5916 out_put:
5917         lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
5918         iput(inode);
5919         return err;
5920 out:
5921         return dquot_quota_off(sb, type);
5922 }
5923
5924 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5925  * acquiring the locks... As quota files are never truncated and quota code
5926  * itself serializes the operations (and no one else should touch the files)
5927  * we don't have to be afraid of races */
5928 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5929                                size_t len, loff_t off)
5930 {
5931         struct inode *inode = sb_dqopt(sb)->files[type];
5932         ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5933         int offset = off & (sb->s_blocksize - 1);
5934         int tocopy;
5935         size_t toread;
5936         struct buffer_head *bh;
5937         loff_t i_size = i_size_read(inode);
5938
5939         if (off > i_size)
5940                 return 0;
5941         if (off+len > i_size)
5942                 len = i_size-off;
5943         toread = len;
5944         while (toread > 0) {
5945                 tocopy = sb->s_blocksize - offset < toread ?
5946                                 sb->s_blocksize - offset : toread;
5947                 bh = ext4_bread(NULL, inode, blk, 0);
5948                 if (IS_ERR(bh))
5949                         return PTR_ERR(bh);
5950                 if (!bh)        /* A hole? */
5951                         memset(data, 0, tocopy);
5952                 else
5953                         memcpy(data, bh->b_data+offset, tocopy);
5954                 brelse(bh);
5955                 offset = 0;
5956                 toread -= tocopy;
5957                 data += tocopy;
5958                 blk++;
5959         }
5960         return len;
5961 }
5962
5963 /* Write to quotafile (we know the transaction is already started and has
5964  * enough credits) */
5965 static ssize_t ext4_quota_write(struct super_block *sb, int type,
5966                                 const char *data, size_t len, loff_t off)
5967 {
5968         struct inode *inode = sb_dqopt(sb)->files[type];
5969         ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5970         int err, offset = off & (sb->s_blocksize - 1);
5971         int retries = 0;
5972         struct buffer_head *bh;
5973         handle_t *handle = journal_current_handle();
5974
5975         if (EXT4_SB(sb)->s_journal && !handle) {
5976                 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5977                         " cancelled because transaction is not started",
5978                         (unsigned long long)off, (unsigned long long)len);
5979                 return -EIO;
5980         }
5981         /*
5982          * Since we account only one data block in transaction credits,
5983          * then it is impossible to cross a block boundary.
5984          */
5985         if (sb->s_blocksize - offset < len) {
5986                 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5987                         " cancelled because not block aligned",
5988                         (unsigned long long)off, (unsigned long long)len);
5989                 return -EIO;
5990         }
5991
5992         do {
5993                 bh = ext4_bread(handle, inode, blk,
5994                                 EXT4_GET_BLOCKS_CREATE |
5995                                 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5996         } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5997                  ext4_should_retry_alloc(inode->i_sb, &retries));
5998         if (IS_ERR(bh))
5999                 return PTR_ERR(bh);
6000         if (!bh)
6001                 goto out;
6002         BUFFER_TRACE(bh, "get write access");
6003         err = ext4_journal_get_write_access(handle, bh);
6004         if (err) {
6005                 brelse(bh);
6006                 return err;
6007         }
6008         lock_buffer(bh);
6009         memcpy(bh->b_data+offset, data, len);
6010         flush_dcache_page(bh->b_page);
6011         unlock_buffer(bh);
6012         err = ext4_handle_dirty_metadata(handle, NULL, bh);
6013         brelse(bh);
6014 out:
6015         if (inode->i_size < off + len) {
6016                 i_size_write(inode, off + len);
6017                 EXT4_I(inode)->i_disksize = inode->i_size;
6018                 ext4_mark_inode_dirty(handle, inode);
6019         }
6020         return len;
6021 }
6022
6023 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
6024 {
6025         const struct quota_format_ops   *ops;
6026
6027         if (!sb_has_quota_loaded(sb, qid->type))
6028                 return -ESRCH;
6029         ops = sb_dqopt(sb)->ops[qid->type];
6030         if (!ops || !ops->get_next_id)
6031                 return -ENOSYS;
6032         return dquot_get_next_id(sb, qid);
6033 }
6034 #endif
6035
6036 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
6037                        const char *dev_name, void *data)
6038 {
6039         return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
6040 }
6041
6042 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
6043 static inline void register_as_ext2(void)
6044 {
6045         int err = register_filesystem(&ext2_fs_type);
6046         if (err)
6047                 printk(KERN_WARNING
6048                        "EXT4-fs: Unable to register as ext2 (%d)\n", err);
6049 }
6050
6051 static inline void unregister_as_ext2(void)
6052 {
6053         unregister_filesystem(&ext2_fs_type);
6054 }
6055
6056 static inline int ext2_feature_set_ok(struct super_block *sb)
6057 {
6058         if (ext4_has_unknown_ext2_incompat_features(sb))
6059                 return 0;
6060         if (sb_rdonly(sb))
6061                 return 1;
6062         if (ext4_has_unknown_ext2_ro_compat_features(sb))
6063                 return 0;
6064         return 1;
6065 }
6066 #else
6067 static inline void register_as_ext2(void) { }
6068 static inline void unregister_as_ext2(void) { }
6069 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
6070 #endif
6071
6072 static inline void register_as_ext3(void)
6073 {
6074         int err = register_filesystem(&ext3_fs_type);
6075         if (err)
6076                 printk(KERN_WARNING
6077                        "EXT4-fs: Unable to register as ext3 (%d)\n", err);
6078 }
6079
6080 static inline void unregister_as_ext3(void)
6081 {
6082         unregister_filesystem(&ext3_fs_type);
6083 }
6084
6085 static inline int ext3_feature_set_ok(struct super_block *sb)
6086 {
6087         if (ext4_has_unknown_ext3_incompat_features(sb))
6088                 return 0;
6089         if (!ext4_has_feature_journal(sb))
6090                 return 0;
6091         if (sb_rdonly(sb))
6092                 return 1;
6093         if (ext4_has_unknown_ext3_ro_compat_features(sb))
6094                 return 0;
6095         return 1;
6096 }
6097
6098 static struct file_system_type ext4_fs_type = {
6099         .owner          = THIS_MODULE,
6100         .name           = "ext4",
6101         .mount          = ext4_mount,
6102         .kill_sb        = kill_block_super,
6103         .fs_flags       = FS_REQUIRES_DEV,
6104 };
6105 MODULE_ALIAS_FS("ext4");
6106
6107 /* Shared across all ext4 file systems */
6108 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
6109
6110 static int __init ext4_init_fs(void)
6111 {
6112         int i, err;
6113
6114         ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
6115         ext4_li_info = NULL;
6116         mutex_init(&ext4_li_mtx);
6117
6118         /* Build-time check for flags consistency */
6119         ext4_check_flag_values();
6120
6121         for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
6122                 init_waitqueue_head(&ext4__ioend_wq[i]);
6123
6124         err = ext4_init_es();
6125         if (err)
6126                 return err;
6127
6128         err = ext4_init_pending();
6129         if (err)
6130                 goto out7;
6131
6132         err = ext4_init_post_read_processing();
6133         if (err)
6134                 goto out6;
6135
6136         err = ext4_init_pageio();
6137         if (err)
6138                 goto out5;
6139
6140         err = ext4_init_system_zone();
6141         if (err)
6142                 goto out4;
6143
6144         err = ext4_init_sysfs();
6145         if (err)
6146                 goto out3;
6147
6148         err = ext4_init_mballoc();
6149         if (err)
6150                 goto out2;
6151         err = init_inodecache();
6152         if (err)
6153                 goto out1;
6154         register_as_ext3();
6155         register_as_ext2();
6156         err = register_filesystem(&ext4_fs_type);
6157         if (err)
6158                 goto out;
6159
6160         return 0;
6161 out:
6162         unregister_as_ext2();
6163         unregister_as_ext3();
6164         destroy_inodecache();
6165 out1:
6166         ext4_exit_mballoc();
6167 out2:
6168         ext4_exit_sysfs();
6169 out3:
6170         ext4_exit_system_zone();
6171 out4:
6172         ext4_exit_pageio();
6173 out5:
6174         ext4_exit_post_read_processing();
6175 out6:
6176         ext4_exit_pending();
6177 out7:
6178         ext4_exit_es();
6179
6180         return err;
6181 }
6182
6183 static void __exit ext4_exit_fs(void)
6184 {
6185         ext4_destroy_lazyinit_thread();
6186         unregister_as_ext2();
6187         unregister_as_ext3();
6188         unregister_filesystem(&ext4_fs_type);
6189         destroy_inodecache();
6190         ext4_exit_mballoc();
6191         ext4_exit_sysfs();
6192         ext4_exit_system_zone();
6193         ext4_exit_pageio();
6194         ext4_exit_post_read_processing();
6195         ext4_exit_es();
6196         ext4_exit_pending();
6197 }
6198
6199 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
6200 MODULE_DESCRIPTION("Fourth Extended Filesystem");
6201 MODULE_LICENSE("GPL");
6202 MODULE_SOFTDEP("pre: crc32c");
6203 module_init(ext4_init_fs)
6204 module_exit(ext4_exit_fs)