2 * linux/fs/ext4/super.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/time.h>
23 #include <linux/jbd2.h>
24 #include <linux/slab.h>
25 #include <linux/init.h>
26 #include <linux/blkdev.h>
27 #include <linux/parser.h>
28 #include <linux/smp_lock.h>
29 #include <linux/buffer_head.h>
30 #include <linux/exportfs.h>
31 #include <linux/vfs.h>
32 #include <linux/random.h>
33 #include <linux/mount.h>
34 #include <linux/namei.h>
35 #include <linux/quotaops.h>
36 #include <linux/seq_file.h>
37 #include <linux/proc_fs.h>
38 #include <linux/marker.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <asm/uaccess.h>
44 #include "ext4_jbd2.h"
50 struct proc_dir_entry *ext4_proc_root;
52 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
53 unsigned long journal_devnum);
54 static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
56 static void ext4_commit_super(struct super_block *sb,
57 struct ext4_super_block *es, int sync);
58 static void ext4_mark_recovery_complete(struct super_block *sb,
59 struct ext4_super_block *es);
60 static void ext4_clear_journal_err(struct super_block *sb,
61 struct ext4_super_block *es);
62 static int ext4_sync_fs(struct super_block *sb, int wait);
63 static const char *ext4_decode_error(struct super_block *sb, int errno,
65 static int ext4_remount(struct super_block *sb, int *flags, char *data);
66 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
67 static void ext4_unlockfs(struct super_block *sb);
68 static void ext4_write_super(struct super_block *sb);
69 static void ext4_write_super_lockfs(struct super_block *sb);
72 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
73 struct ext4_group_desc *bg)
75 return le32_to_cpu(bg->bg_block_bitmap_lo) |
76 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
77 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
80 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
81 struct ext4_group_desc *bg)
83 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
84 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
85 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
88 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
89 struct ext4_group_desc *bg)
91 return le32_to_cpu(bg->bg_inode_table_lo) |
92 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
93 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
96 void ext4_block_bitmap_set(struct super_block *sb,
97 struct ext4_group_desc *bg, ext4_fsblk_t blk)
99 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
100 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
101 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
104 void ext4_inode_bitmap_set(struct super_block *sb,
105 struct ext4_group_desc *bg, ext4_fsblk_t blk)
107 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
108 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
109 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
112 void ext4_inode_table_set(struct super_block *sb,
113 struct ext4_group_desc *bg, ext4_fsblk_t blk)
115 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
116 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
117 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
121 * Wrappers for jbd2_journal_start/end.
123 * The only special thing we need to do here is to make sure that all
124 * journal_end calls result in the superblock being marked dirty, so
125 * that sync() will call the filesystem's write_super callback if
128 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
132 if (sb->s_flags & MS_RDONLY)
133 return ERR_PTR(-EROFS);
135 /* Special case here: if the journal has aborted behind our
136 * backs (eg. EIO in the commit thread), then we still need to
137 * take the FS itself readonly cleanly. */
138 journal = EXT4_SB(sb)->s_journal;
139 if (is_journal_aborted(journal)) {
140 ext4_abort(sb, __func__,
141 "Detected aborted journal");
142 return ERR_PTR(-EROFS);
145 return jbd2_journal_start(journal, nblocks);
149 * The only special thing we need to do here is to make sure that all
150 * jbd2_journal_stop calls result in the superblock being marked dirty, so
151 * that sync() will call the filesystem's write_super callback if
154 int __ext4_journal_stop(const char *where, handle_t *handle)
156 struct super_block *sb;
160 sb = handle->h_transaction->t_journal->j_private;
162 rc = jbd2_journal_stop(handle);
167 __ext4_std_error(sb, where, err);
171 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
172 struct buffer_head *bh, handle_t *handle, int err)
175 const char *errstr = ext4_decode_error(NULL, err, nbuf);
178 BUFFER_TRACE(bh, "abort");
183 if (is_handle_aborted(handle))
186 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
187 caller, errstr, err_fn);
189 jbd2_journal_abort_handle(handle);
192 /* Deal with the reporting of failure conditions on a filesystem such as
193 * inconsistencies detected or read IO failures.
195 * On ext2, we can store the error state of the filesystem in the
196 * superblock. That is not possible on ext4, because we may have other
197 * write ordering constraints on the superblock which prevent us from
198 * writing it out straight away; and given that the journal is about to
199 * be aborted, we can't rely on the current, or future, transactions to
200 * write out the superblock safely.
202 * We'll just use the jbd2_journal_abort() error code to record an error in
203 * the journal instead. On recovery, the journal will compain about
204 * that error until we've noted it down and cleared it.
207 static void ext4_handle_error(struct super_block *sb)
209 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
211 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
212 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
214 if (sb->s_flags & MS_RDONLY)
217 if (!test_opt(sb, ERRORS_CONT)) {
218 journal_t *journal = EXT4_SB(sb)->s_journal;
220 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
222 jbd2_journal_abort(journal, -EIO);
224 if (test_opt(sb, ERRORS_RO)) {
225 printk(KERN_CRIT "Remounting filesystem read-only\n");
226 sb->s_flags |= MS_RDONLY;
228 ext4_commit_super(sb, es, 1);
229 if (test_opt(sb, ERRORS_PANIC))
230 panic("EXT4-fs (device %s): panic forced after error\n",
234 void ext4_error(struct super_block *sb, const char *function,
235 const char *fmt, ...)
240 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
245 ext4_handle_error(sb);
248 static const char *ext4_decode_error(struct super_block *sb, int errno,
255 errstr = "IO failure";
258 errstr = "Out of memory";
261 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
262 errstr = "Journal has aborted";
264 errstr = "Readonly filesystem";
267 /* If the caller passed in an extra buffer for unknown
268 * errors, textualise them now. Else we just return
271 /* Check for truncated error codes... */
272 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
281 /* __ext4_std_error decodes expected errors from journaling functions
282 * automatically and invokes the appropriate error response. */
284 void __ext4_std_error(struct super_block *sb, const char *function, int errno)
289 /* Special case: if the error is EROFS, and we're not already
290 * inside a transaction, then there's really no point in logging
292 if (errno == -EROFS && journal_current_handle() == NULL &&
293 (sb->s_flags & MS_RDONLY))
296 errstr = ext4_decode_error(sb, errno, nbuf);
297 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
298 sb->s_id, function, errstr);
300 ext4_handle_error(sb);
304 * ext4_abort is a much stronger failure handler than ext4_error. The
305 * abort function may be used to deal with unrecoverable failures such
306 * as journal IO errors or ENOMEM at a critical moment in log management.
308 * We unconditionally force the filesystem into an ABORT|READONLY state,
309 * unless the error response on the fs has been set to panic in which
310 * case we take the easy way out and panic immediately.
313 void ext4_abort(struct super_block *sb, const char *function,
314 const char *fmt, ...)
318 printk(KERN_CRIT "ext4_abort called.\n");
321 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
326 if (test_opt(sb, ERRORS_PANIC))
327 panic("EXT4-fs panic from previous error\n");
329 if (sb->s_flags & MS_RDONLY)
332 printk(KERN_CRIT "Remounting filesystem read-only\n");
333 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
334 sb->s_flags |= MS_RDONLY;
335 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
336 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
339 void ext4_warning(struct super_block *sb, const char *function,
340 const char *fmt, ...)
345 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
352 void ext4_update_dynamic_rev(struct super_block *sb)
354 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
356 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
359 ext4_warning(sb, __func__,
360 "updating to rev %d because of new feature flag, "
361 "running e2fsck is recommended",
364 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
365 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
366 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
367 /* leave es->s_feature_*compat flags alone */
368 /* es->s_uuid will be set by e2fsck if empty */
371 * The rest of the superblock fields should be zero, and if not it
372 * means they are likely already in use, so leave them alone. We
373 * can leave it up to e2fsck to clean up any inconsistencies there.
378 * Open the external journal device
380 static struct block_device *ext4_blkdev_get(dev_t dev)
382 struct block_device *bdev;
383 char b[BDEVNAME_SIZE];
385 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
391 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
392 __bdevname(dev, b), PTR_ERR(bdev));
397 * Release the journal device
399 static int ext4_blkdev_put(struct block_device *bdev)
402 return blkdev_put(bdev);
405 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
407 struct block_device *bdev;
410 bdev = sbi->journal_bdev;
412 ret = ext4_blkdev_put(bdev);
413 sbi->journal_bdev = NULL;
418 static inline struct inode *orphan_list_entry(struct list_head *l)
420 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
423 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
427 printk(KERN_ERR "sb orphan head is %d\n",
428 le32_to_cpu(sbi->s_es->s_last_orphan));
430 printk(KERN_ERR "sb_info orphan list:\n");
431 list_for_each(l, &sbi->s_orphan) {
432 struct inode *inode = orphan_list_entry(l);
434 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
435 inode->i_sb->s_id, inode->i_ino, inode,
436 inode->i_mode, inode->i_nlink,
441 static void ext4_put_super(struct super_block *sb)
443 struct ext4_sb_info *sbi = EXT4_SB(sb);
444 struct ext4_super_block *es = sbi->s_es;
448 ext4_ext_release(sb);
449 ext4_xattr_put_super(sb);
450 if (jbd2_journal_destroy(sbi->s_journal) < 0)
451 ext4_abort(sb, __func__, "Couldn't clean up the journal");
452 sbi->s_journal = NULL;
453 if (!(sb->s_flags & MS_RDONLY)) {
454 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
455 es->s_state = cpu_to_le16(sbi->s_mount_state);
456 ext4_commit_super(sb, es, 1);
459 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
460 remove_proc_entry(sb->s_id, ext4_proc_root);
463 for (i = 0; i < sbi->s_gdb_count; i++)
464 brelse(sbi->s_group_desc[i]);
465 kfree(sbi->s_group_desc);
466 kfree(sbi->s_flex_groups);
467 percpu_counter_destroy(&sbi->s_freeblocks_counter);
468 percpu_counter_destroy(&sbi->s_freeinodes_counter);
469 percpu_counter_destroy(&sbi->s_dirs_counter);
470 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
473 for (i = 0; i < MAXQUOTAS; i++)
474 kfree(sbi->s_qf_names[i]);
477 /* Debugging code just in case the in-memory inode orphan list
478 * isn't empty. The on-disk one can be non-empty if we've
479 * detected an error and taken the fs readonly, but the
480 * in-memory list had better be clean by this point. */
481 if (!list_empty(&sbi->s_orphan))
482 dump_orphan_list(sb, sbi);
483 J_ASSERT(list_empty(&sbi->s_orphan));
485 invalidate_bdev(sb->s_bdev);
486 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
488 * Invalidate the journal device's buffers. We don't want them
489 * floating about in memory - the physical journal device may
490 * hotswapped, and it breaks the `ro-after' testing code.
492 sync_blockdev(sbi->journal_bdev);
493 invalidate_bdev(sbi->journal_bdev);
494 ext4_blkdev_remove(sbi);
496 sb->s_fs_info = NULL;
501 static struct kmem_cache *ext4_inode_cachep;
504 * Called inside transaction, so use GFP_NOFS
506 static struct inode *ext4_alloc_inode(struct super_block *sb)
508 struct ext4_inode_info *ei;
510 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
513 #ifdef CONFIG_EXT4_FS_POSIX_ACL
514 ei->i_acl = EXT4_ACL_NOT_CACHED;
515 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
517 ei->vfs_inode.i_version = 1;
518 ei->vfs_inode.i_data.writeback_index = 0;
519 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
520 INIT_LIST_HEAD(&ei->i_prealloc_list);
521 spin_lock_init(&ei->i_prealloc_lock);
522 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
523 ei->i_reserved_data_blocks = 0;
524 ei->i_reserved_meta_blocks = 0;
525 ei->i_allocated_meta_blocks = 0;
526 ei->i_delalloc_reserved_flag = 0;
527 spin_lock_init(&(ei->i_block_reservation_lock));
528 return &ei->vfs_inode;
531 static void ext4_destroy_inode(struct inode *inode)
533 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
534 printk("EXT4 Inode %p: orphan list check failed!\n",
536 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
537 EXT4_I(inode), sizeof(struct ext4_inode_info),
541 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
544 static void init_once(void *foo)
546 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
548 INIT_LIST_HEAD(&ei->i_orphan);
549 #ifdef CONFIG_EXT4_FS_XATTR
550 init_rwsem(&ei->xattr_sem);
552 init_rwsem(&ei->i_data_sem);
553 inode_init_once(&ei->vfs_inode);
556 static int init_inodecache(void)
558 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
559 sizeof(struct ext4_inode_info),
560 0, (SLAB_RECLAIM_ACCOUNT|
563 if (ext4_inode_cachep == NULL)
568 static void destroy_inodecache(void)
570 kmem_cache_destroy(ext4_inode_cachep);
573 static void ext4_clear_inode(struct inode *inode)
575 #ifdef CONFIG_EXT4_FS_POSIX_ACL
576 if (EXT4_I(inode)->i_acl &&
577 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
578 posix_acl_release(EXT4_I(inode)->i_acl);
579 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
581 if (EXT4_I(inode)->i_default_acl &&
582 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
583 posix_acl_release(EXT4_I(inode)->i_default_acl);
584 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
587 ext4_discard_preallocations(inode);
588 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
589 &EXT4_I(inode)->jinode);
592 static inline void ext4_show_quota_options(struct seq_file *seq,
593 struct super_block *sb)
595 #if defined(CONFIG_QUOTA)
596 struct ext4_sb_info *sbi = EXT4_SB(sb);
598 if (sbi->s_jquota_fmt)
599 seq_printf(seq, ",jqfmt=%s",
600 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
602 if (sbi->s_qf_names[USRQUOTA])
603 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
605 if (sbi->s_qf_names[GRPQUOTA])
606 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
608 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
609 seq_puts(seq, ",usrquota");
611 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
612 seq_puts(seq, ",grpquota");
618 * - it's set to a non-default value OR
619 * - if the per-sb default is different from the global default
621 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
624 unsigned long def_mount_opts;
625 struct super_block *sb = vfs->mnt_sb;
626 struct ext4_sb_info *sbi = EXT4_SB(sb);
627 struct ext4_super_block *es = sbi->s_es;
629 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
630 def_errors = le16_to_cpu(es->s_errors);
632 if (sbi->s_sb_block != 1)
633 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
634 if (test_opt(sb, MINIX_DF))
635 seq_puts(seq, ",minixdf");
636 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
637 seq_puts(seq, ",grpid");
638 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
639 seq_puts(seq, ",nogrpid");
640 if (sbi->s_resuid != EXT4_DEF_RESUID ||
641 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
642 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
644 if (sbi->s_resgid != EXT4_DEF_RESGID ||
645 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
646 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
648 if (test_opt(sb, ERRORS_RO)) {
649 if (def_errors == EXT4_ERRORS_PANIC ||
650 def_errors == EXT4_ERRORS_CONTINUE) {
651 seq_puts(seq, ",errors=remount-ro");
654 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
655 seq_puts(seq, ",errors=continue");
656 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
657 seq_puts(seq, ",errors=panic");
658 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
659 seq_puts(seq, ",nouid32");
660 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
661 seq_puts(seq, ",debug");
662 if (test_opt(sb, OLDALLOC))
663 seq_puts(seq, ",oldalloc");
664 #ifdef CONFIG_EXT4_FS_XATTR
665 if (test_opt(sb, XATTR_USER) &&
666 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
667 seq_puts(seq, ",user_xattr");
668 if (!test_opt(sb, XATTR_USER) &&
669 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
670 seq_puts(seq, ",nouser_xattr");
673 #ifdef CONFIG_EXT4_FS_POSIX_ACL
674 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
675 seq_puts(seq, ",acl");
676 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
677 seq_puts(seq, ",noacl");
679 if (!test_opt(sb, RESERVATION))
680 seq_puts(seq, ",noreservation");
681 if (sbi->s_commit_interval) {
682 seq_printf(seq, ",commit=%u",
683 (unsigned) (sbi->s_commit_interval / HZ));
686 * We're changing the default of barrier mount option, so
687 * let's always display its mount state so it's clear what its
690 seq_puts(seq, ",barrier=");
691 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
692 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
693 seq_puts(seq, ",journal_async_commit");
694 if (test_opt(sb, NOBH))
695 seq_puts(seq, ",nobh");
696 if (!test_opt(sb, EXTENTS))
697 seq_puts(seq, ",noextents");
698 if (test_opt(sb, I_VERSION))
699 seq_puts(seq, ",i_version");
700 if (!test_opt(sb, DELALLOC))
701 seq_puts(seq, ",nodelalloc");
705 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
707 * journal mode get enabled in different ways
708 * So just print the value even if we didn't specify it
710 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
711 seq_puts(seq, ",data=journal");
712 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
713 seq_puts(seq, ",data=ordered");
714 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
715 seq_puts(seq, ",data=writeback");
717 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
718 seq_printf(seq, ",inode_readahead_blks=%u",
719 sbi->s_inode_readahead_blks);
721 if (test_opt(sb, DATA_ERR_ABORT))
722 seq_puts(seq, ",data_err=abort");
724 ext4_show_quota_options(seq, sb);
729 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
730 u64 ino, u32 generation)
734 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
735 return ERR_PTR(-ESTALE);
736 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
737 return ERR_PTR(-ESTALE);
739 /* iget isn't really right if the inode is currently unallocated!!
741 * ext4_read_inode will return a bad_inode if the inode had been
742 * deleted, so we should be safe.
744 * Currently we don't know the generation for parent directory, so
745 * a generation of 0 means "accept any"
747 inode = ext4_iget(sb, ino);
749 return ERR_CAST(inode);
750 if (generation && inode->i_generation != generation) {
752 return ERR_PTR(-ESTALE);
758 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
759 int fh_len, int fh_type)
761 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
765 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
766 int fh_len, int fh_type)
768 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
773 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
774 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
776 static int ext4_dquot_initialize(struct inode *inode, int type);
777 static int ext4_dquot_drop(struct inode *inode);
778 static int ext4_write_dquot(struct dquot *dquot);
779 static int ext4_acquire_dquot(struct dquot *dquot);
780 static int ext4_release_dquot(struct dquot *dquot);
781 static int ext4_mark_dquot_dirty(struct dquot *dquot);
782 static int ext4_write_info(struct super_block *sb, int type);
783 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
784 char *path, int remount);
785 static int ext4_quota_on_mount(struct super_block *sb, int type);
786 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
787 size_t len, loff_t off);
788 static ssize_t ext4_quota_write(struct super_block *sb, int type,
789 const char *data, size_t len, loff_t off);
791 static struct dquot_operations ext4_quota_operations = {
792 .initialize = ext4_dquot_initialize,
793 .drop = ext4_dquot_drop,
794 .alloc_space = dquot_alloc_space,
795 .alloc_inode = dquot_alloc_inode,
796 .free_space = dquot_free_space,
797 .free_inode = dquot_free_inode,
798 .transfer = dquot_transfer,
799 .write_dquot = ext4_write_dquot,
800 .acquire_dquot = ext4_acquire_dquot,
801 .release_dquot = ext4_release_dquot,
802 .mark_dirty = ext4_mark_dquot_dirty,
803 .write_info = ext4_write_info
806 static struct quotactl_ops ext4_qctl_operations = {
807 .quota_on = ext4_quota_on,
808 .quota_off = vfs_quota_off,
809 .quota_sync = vfs_quota_sync,
810 .get_info = vfs_get_dqinfo,
811 .set_info = vfs_set_dqinfo,
812 .get_dqblk = vfs_get_dqblk,
813 .set_dqblk = vfs_set_dqblk
817 static const struct super_operations ext4_sops = {
818 .alloc_inode = ext4_alloc_inode,
819 .destroy_inode = ext4_destroy_inode,
820 .write_inode = ext4_write_inode,
821 .dirty_inode = ext4_dirty_inode,
822 .delete_inode = ext4_delete_inode,
823 .put_super = ext4_put_super,
824 .write_super = ext4_write_super,
825 .sync_fs = ext4_sync_fs,
826 .write_super_lockfs = ext4_write_super_lockfs,
827 .unlockfs = ext4_unlockfs,
828 .statfs = ext4_statfs,
829 .remount_fs = ext4_remount,
830 .clear_inode = ext4_clear_inode,
831 .show_options = ext4_show_options,
833 .quota_read = ext4_quota_read,
834 .quota_write = ext4_quota_write,
838 static const struct export_operations ext4_export_ops = {
839 .fh_to_dentry = ext4_fh_to_dentry,
840 .fh_to_parent = ext4_fh_to_parent,
841 .get_parent = ext4_get_parent,
845 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
846 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
847 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
848 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
849 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
850 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
851 Opt_journal_checksum, Opt_journal_async_commit,
852 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
853 Opt_data_err_abort, Opt_data_err_ignore,
854 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
855 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
856 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
857 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
858 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
859 Opt_inode_readahead_blks
862 static const match_table_t tokens = {
863 {Opt_bsd_df, "bsddf"},
864 {Opt_minix_df, "minixdf"},
865 {Opt_grpid, "grpid"},
866 {Opt_grpid, "bsdgroups"},
867 {Opt_nogrpid, "nogrpid"},
868 {Opt_nogrpid, "sysvgroups"},
869 {Opt_resgid, "resgid=%u"},
870 {Opt_resuid, "resuid=%u"},
872 {Opt_err_cont, "errors=continue"},
873 {Opt_err_panic, "errors=panic"},
874 {Opt_err_ro, "errors=remount-ro"},
875 {Opt_nouid32, "nouid32"},
876 {Opt_debug, "debug"},
877 {Opt_oldalloc, "oldalloc"},
878 {Opt_orlov, "orlov"},
879 {Opt_user_xattr, "user_xattr"},
880 {Opt_nouser_xattr, "nouser_xattr"},
882 {Opt_noacl, "noacl"},
883 {Opt_reservation, "reservation"},
884 {Opt_noreservation, "noreservation"},
885 {Opt_noload, "noload"},
888 {Opt_commit, "commit=%u"},
889 {Opt_journal_update, "journal=update"},
890 {Opt_journal_inum, "journal=%u"},
891 {Opt_journal_dev, "journal_dev=%u"},
892 {Opt_journal_checksum, "journal_checksum"},
893 {Opt_journal_async_commit, "journal_async_commit"},
894 {Opt_abort, "abort"},
895 {Opt_data_journal, "data=journal"},
896 {Opt_data_ordered, "data=ordered"},
897 {Opt_data_writeback, "data=writeback"},
898 {Opt_data_err_abort, "data_err=abort"},
899 {Opt_data_err_ignore, "data_err=ignore"},
900 {Opt_offusrjquota, "usrjquota="},
901 {Opt_usrjquota, "usrjquota=%s"},
902 {Opt_offgrpjquota, "grpjquota="},
903 {Opt_grpjquota, "grpjquota=%s"},
904 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
905 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
906 {Opt_grpquota, "grpquota"},
907 {Opt_noquota, "noquota"},
908 {Opt_quota, "quota"},
909 {Opt_usrquota, "usrquota"},
910 {Opt_barrier, "barrier=%u"},
911 {Opt_extents, "extents"},
912 {Opt_noextents, "noextents"},
913 {Opt_i_version, "i_version"},
914 {Opt_stripe, "stripe=%u"},
915 {Opt_resize, "resize"},
916 {Opt_delalloc, "delalloc"},
917 {Opt_nodelalloc, "nodelalloc"},
918 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
922 static ext4_fsblk_t get_sb_block(void **data)
924 ext4_fsblk_t sb_block;
925 char *options = (char *) *data;
927 if (!options || strncmp(options, "sb=", 3) != 0)
928 return 1; /* Default location */
930 /*todo: use simple_strtoll with >32bit ext4 */
931 sb_block = simple_strtoul(options, &options, 0);
932 if (*options && *options != ',') {
933 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
939 *data = (void *) options;
943 static int parse_options(char *options, struct super_block *sb,
944 unsigned int *inum, unsigned long *journal_devnum,
945 ext4_fsblk_t *n_blocks_count, int is_remount)
947 struct ext4_sb_info *sbi = EXT4_SB(sb);
949 substring_t args[MAX_OPT_ARGS];
956 ext4_fsblk_t last_block;
961 while ((p = strsep(&options, ",")) != NULL) {
966 token = match_token(p, tokens, args);
969 clear_opt(sbi->s_mount_opt, MINIX_DF);
972 set_opt(sbi->s_mount_opt, MINIX_DF);
975 set_opt(sbi->s_mount_opt, GRPID);
978 clear_opt(sbi->s_mount_opt, GRPID);
981 if (match_int(&args[0], &option))
983 sbi->s_resuid = option;
986 if (match_int(&args[0], &option))
988 sbi->s_resgid = option;
991 /* handled by get_sb_block() instead of here */
992 /* *sb_block = match_int(&args[0]); */
995 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
996 clear_opt(sbi->s_mount_opt, ERRORS_RO);
997 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1000 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1001 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1002 set_opt(sbi->s_mount_opt, ERRORS_RO);
1005 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1006 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1007 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1010 set_opt(sbi->s_mount_opt, NO_UID32);
1013 set_opt(sbi->s_mount_opt, DEBUG);
1016 set_opt(sbi->s_mount_opt, OLDALLOC);
1019 clear_opt(sbi->s_mount_opt, OLDALLOC);
1021 #ifdef CONFIG_EXT4_FS_XATTR
1022 case Opt_user_xattr:
1023 set_opt(sbi->s_mount_opt, XATTR_USER);
1025 case Opt_nouser_xattr:
1026 clear_opt(sbi->s_mount_opt, XATTR_USER);
1029 case Opt_user_xattr:
1030 case Opt_nouser_xattr:
1031 printk(KERN_ERR "EXT4 (no)user_xattr options "
1035 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1037 set_opt(sbi->s_mount_opt, POSIX_ACL);
1040 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1045 printk(KERN_ERR "EXT4 (no)acl options "
1049 case Opt_reservation:
1050 set_opt(sbi->s_mount_opt, RESERVATION);
1052 case Opt_noreservation:
1053 clear_opt(sbi->s_mount_opt, RESERVATION);
1055 case Opt_journal_update:
1057 /* Eventually we will want to be able to create
1058 a journal file here. For now, only allow the
1059 user to specify an existing inode to be the
1062 printk(KERN_ERR "EXT4-fs: cannot specify "
1063 "journal on remount\n");
1066 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1068 case Opt_journal_inum:
1070 printk(KERN_ERR "EXT4-fs: cannot specify "
1071 "journal on remount\n");
1074 if (match_int(&args[0], &option))
1078 case Opt_journal_dev:
1080 printk(KERN_ERR "EXT4-fs: cannot specify "
1081 "journal on remount\n");
1084 if (match_int(&args[0], &option))
1086 *journal_devnum = option;
1088 case Opt_journal_checksum:
1089 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1091 case Opt_journal_async_commit:
1092 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1093 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1096 set_opt(sbi->s_mount_opt, NOLOAD);
1099 if (match_int(&args[0], &option))
1104 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1105 sbi->s_commit_interval = HZ * option;
1107 case Opt_data_journal:
1108 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1110 case Opt_data_ordered:
1111 data_opt = EXT4_MOUNT_ORDERED_DATA;
1113 case Opt_data_writeback:
1114 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1117 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1120 "EXT4-fs: cannot change data "
1121 "mode on remount\n");
1125 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1126 sbi->s_mount_opt |= data_opt;
1129 case Opt_data_err_abort:
1130 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1132 case Opt_data_err_ignore:
1133 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1142 if ((sb_any_quota_enabled(sb) ||
1143 sb_any_quota_suspended(sb)) &&
1144 !sbi->s_qf_names[qtype]) {
1146 "EXT4-fs: Cannot change journaled "
1147 "quota options when quota turned on.\n");
1150 qname = match_strdup(&args[0]);
1153 "EXT4-fs: not enough memory for "
1154 "storing quotafile name.\n");
1157 if (sbi->s_qf_names[qtype] &&
1158 strcmp(sbi->s_qf_names[qtype], qname)) {
1160 "EXT4-fs: %s quota file already "
1161 "specified.\n", QTYPE2NAME(qtype));
1165 sbi->s_qf_names[qtype] = qname;
1166 if (strchr(sbi->s_qf_names[qtype], '/')) {
1168 "EXT4-fs: quotafile must be on "
1169 "filesystem root.\n");
1170 kfree(sbi->s_qf_names[qtype]);
1171 sbi->s_qf_names[qtype] = NULL;
1174 set_opt(sbi->s_mount_opt, QUOTA);
1176 case Opt_offusrjquota:
1179 case Opt_offgrpjquota:
1182 if ((sb_any_quota_enabled(sb) ||
1183 sb_any_quota_suspended(sb)) &&
1184 sbi->s_qf_names[qtype]) {
1185 printk(KERN_ERR "EXT4-fs: Cannot change "
1186 "journaled quota options when "
1187 "quota turned on.\n");
1191 * The space will be released later when all options
1192 * are confirmed to be correct
1194 sbi->s_qf_names[qtype] = NULL;
1196 case Opt_jqfmt_vfsold:
1197 qfmt = QFMT_VFS_OLD;
1199 case Opt_jqfmt_vfsv0:
1202 if ((sb_any_quota_enabled(sb) ||
1203 sb_any_quota_suspended(sb)) &&
1204 sbi->s_jquota_fmt != qfmt) {
1205 printk(KERN_ERR "EXT4-fs: Cannot change "
1206 "journaled quota options when "
1207 "quota turned on.\n");
1210 sbi->s_jquota_fmt = qfmt;
1214 set_opt(sbi->s_mount_opt, QUOTA);
1215 set_opt(sbi->s_mount_opt, USRQUOTA);
1218 set_opt(sbi->s_mount_opt, QUOTA);
1219 set_opt(sbi->s_mount_opt, GRPQUOTA);
1222 if (sb_any_quota_enabled(sb)) {
1223 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1224 "options when quota turned on.\n");
1227 clear_opt(sbi->s_mount_opt, QUOTA);
1228 clear_opt(sbi->s_mount_opt, USRQUOTA);
1229 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1236 "EXT4-fs: quota options not supported.\n");
1240 case Opt_offusrjquota:
1241 case Opt_offgrpjquota:
1242 case Opt_jqfmt_vfsold:
1243 case Opt_jqfmt_vfsv0:
1245 "EXT4-fs: journaled quota options not "
1252 set_opt(sbi->s_mount_opt, ABORT);
1255 if (match_int(&args[0], &option))
1258 set_opt(sbi->s_mount_opt, BARRIER);
1260 clear_opt(sbi->s_mount_opt, BARRIER);
1266 printk("EXT4-fs: resize option only available "
1270 if (match_int(&args[0], &option) != 0)
1272 *n_blocks_count = option;
1275 set_opt(sbi->s_mount_opt, NOBH);
1278 clear_opt(sbi->s_mount_opt, NOBH);
1281 if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
1282 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
1283 ext4_warning(sb, __func__,
1284 "extents feature not enabled "
1285 "on this filesystem, use tune2fs\n");
1288 set_opt(sbi->s_mount_opt, EXTENTS);
1292 * When e2fsprogs support resizing an already existing
1293 * ext3 file system to greater than 2**32 we need to
1294 * add support to block allocator to handle growing
1295 * already existing block mapped inode so that blocks
1296 * allocated for them fall within 2**32
1298 last_block = ext4_blocks_count(sbi->s_es) - 1;
1299 if (last_block > 0xffffffffULL) {
1300 printk(KERN_ERR "EXT4-fs: Filesystem too "
1301 "large to mount with "
1302 "-o noextents options\n");
1305 clear_opt(sbi->s_mount_opt, EXTENTS);
1308 set_opt(sbi->s_mount_opt, I_VERSION);
1309 sb->s_flags |= MS_I_VERSION;
1311 case Opt_nodelalloc:
1312 clear_opt(sbi->s_mount_opt, DELALLOC);
1315 if (match_int(&args[0], &option))
1319 sbi->s_stripe = option;
1322 set_opt(sbi->s_mount_opt, DELALLOC);
1324 case Opt_inode_readahead_blks:
1325 if (match_int(&args[0], &option))
1327 if (option < 0 || option > (1 << 30))
1329 sbi->s_inode_readahead_blks = option;
1333 "EXT4-fs: Unrecognized mount option \"%s\" "
1334 "or missing value\n", p);
1339 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1340 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1341 sbi->s_qf_names[USRQUOTA])
1342 clear_opt(sbi->s_mount_opt, USRQUOTA);
1344 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1345 sbi->s_qf_names[GRPQUOTA])
1346 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1348 if ((sbi->s_qf_names[USRQUOTA] &&
1349 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1350 (sbi->s_qf_names[GRPQUOTA] &&
1351 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1352 printk(KERN_ERR "EXT4-fs: old and new quota "
1353 "format mixing.\n");
1357 if (!sbi->s_jquota_fmt) {
1358 printk(KERN_ERR "EXT4-fs: journaled quota format "
1359 "not specified.\n");
1363 if (sbi->s_jquota_fmt) {
1364 printk(KERN_ERR "EXT4-fs: journaled quota format "
1365 "specified with no journaling "
1374 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1377 struct ext4_sb_info *sbi = EXT4_SB(sb);
1380 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1381 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1382 "forcing read-only mode\n");
1387 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1388 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1389 "running e2fsck is recommended\n");
1390 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1392 "EXT4-fs warning: mounting fs with errors, "
1393 "running e2fsck is recommended\n");
1394 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1395 le16_to_cpu(es->s_mnt_count) >=
1396 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1398 "EXT4-fs warning: maximal mount count reached, "
1399 "running e2fsck is recommended\n");
1400 else if (le32_to_cpu(es->s_checkinterval) &&
1401 (le32_to_cpu(es->s_lastcheck) +
1402 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1404 "EXT4-fs warning: checktime reached, "
1405 "running e2fsck is recommended\n");
1407 /* @@@ We _will_ want to clear the valid bit if we find
1408 * inconsistencies, to force a fsck at reboot. But for
1409 * a plain journaled filesystem we can keep it set as
1412 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1414 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1415 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1416 le16_add_cpu(&es->s_mnt_count, 1);
1417 es->s_mtime = cpu_to_le32(get_seconds());
1418 ext4_update_dynamic_rev(sb);
1419 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1421 ext4_commit_super(sb, es, 1);
1422 if (test_opt(sb, DEBUG))
1423 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1424 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1426 sbi->s_groups_count,
1427 EXT4_BLOCKS_PER_GROUP(sb),
1428 EXT4_INODES_PER_GROUP(sb),
1431 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
1432 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1433 "external", EXT4_SB(sb)->s_journal->j_devname);
1437 static int ext4_fill_flex_info(struct super_block *sb)
1439 struct ext4_sb_info *sbi = EXT4_SB(sb);
1440 struct ext4_group_desc *gdp = NULL;
1441 struct buffer_head *bh;
1442 ext4_group_t flex_group_count;
1443 ext4_group_t flex_group;
1444 int groups_per_flex = 0;
1445 __u64 block_bitmap = 0;
1448 if (!sbi->s_es->s_log_groups_per_flex) {
1449 sbi->s_log_groups_per_flex = 0;
1453 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1454 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1456 /* We allocate both existing and potentially added groups */
1457 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1458 ((sbi->s_es->s_reserved_gdt_blocks +1 ) <<
1459 EXT4_DESC_PER_BLOCK_BITS(sb))) /
1461 sbi->s_flex_groups = kzalloc(flex_group_count *
1462 sizeof(struct flex_groups), GFP_KERNEL);
1463 if (sbi->s_flex_groups == NULL) {
1464 printk(KERN_ERR "EXT4-fs: not enough memory for "
1465 "%lu flex groups\n", flex_group_count);
1469 gdp = ext4_get_group_desc(sb, 1, &bh);
1470 block_bitmap = ext4_block_bitmap(sb, gdp) - 1;
1472 for (i = 0; i < sbi->s_groups_count; i++) {
1473 gdp = ext4_get_group_desc(sb, i, &bh);
1475 flex_group = ext4_flex_group(sbi, i);
1476 sbi->s_flex_groups[flex_group].free_inodes +=
1477 le16_to_cpu(gdp->bg_free_inodes_count);
1478 sbi->s_flex_groups[flex_group].free_blocks +=
1479 le16_to_cpu(gdp->bg_free_blocks_count);
1487 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1488 struct ext4_group_desc *gdp)
1492 if (sbi->s_es->s_feature_ro_compat &
1493 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1494 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1495 __le32 le_group = cpu_to_le32(block_group);
1497 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1498 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1499 crc = crc16(crc, (__u8 *)gdp, offset);
1500 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1501 /* for checksum of struct ext4_group_desc do the rest...*/
1502 if ((sbi->s_es->s_feature_incompat &
1503 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1504 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1505 crc = crc16(crc, (__u8 *)gdp + offset,
1506 le16_to_cpu(sbi->s_es->s_desc_size) -
1510 return cpu_to_le16(crc);
1513 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1514 struct ext4_group_desc *gdp)
1516 if ((sbi->s_es->s_feature_ro_compat &
1517 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1518 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1524 /* Called at mount-time, super-block is locked */
1525 static int ext4_check_descriptors(struct super_block *sb)
1527 struct ext4_sb_info *sbi = EXT4_SB(sb);
1528 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1529 ext4_fsblk_t last_block;
1530 ext4_fsblk_t block_bitmap;
1531 ext4_fsblk_t inode_bitmap;
1532 ext4_fsblk_t inode_table;
1533 int flexbg_flag = 0;
1536 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1539 ext4_debug("Checking group descriptors");
1541 for (i = 0; i < sbi->s_groups_count; i++) {
1542 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1544 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1545 last_block = ext4_blocks_count(sbi->s_es) - 1;
1547 last_block = first_block +
1548 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1550 block_bitmap = ext4_block_bitmap(sb, gdp);
1551 if (block_bitmap < first_block || block_bitmap > last_block) {
1552 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1553 "Block bitmap for group %lu not in group "
1554 "(block %llu)!\n", i, block_bitmap);
1557 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1558 if (inode_bitmap < first_block || inode_bitmap > last_block) {
1559 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1560 "Inode bitmap for group %lu not in group "
1561 "(block %llu)!\n", i, inode_bitmap);
1564 inode_table = ext4_inode_table(sb, gdp);
1565 if (inode_table < first_block ||
1566 inode_table + sbi->s_itb_per_group - 1 > last_block) {
1567 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1568 "Inode table for group %lu not in group "
1569 "(block %llu)!\n", i, inode_table);
1572 spin_lock(sb_bgl_lock(sbi, i));
1573 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1574 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1575 "Checksum for group %lu failed (%u!=%u)\n",
1576 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1577 gdp)), le16_to_cpu(gdp->bg_checksum));
1578 if (!(sb->s_flags & MS_RDONLY)) {
1579 spin_unlock(sb_bgl_lock(sbi, i));
1583 spin_unlock(sb_bgl_lock(sbi, i));
1585 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1588 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1589 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
1593 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1594 * the superblock) which were deleted from all directories, but held open by
1595 * a process at the time of a crash. We walk the list and try to delete these
1596 * inodes at recovery time (only with a read-write filesystem).
1598 * In order to keep the orphan inode chain consistent during traversal (in
1599 * case of crash during recovery), we link each inode into the superblock
1600 * orphan list_head and handle it the same way as an inode deletion during
1601 * normal operation (which journals the operations for us).
1603 * We only do an iget() and an iput() on each inode, which is very safe if we
1604 * accidentally point at an in-use or already deleted inode. The worst that
1605 * can happen in this case is that we get a "bit already cleared" message from
1606 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1607 * e2fsck was run on this filesystem, and it must have already done the orphan
1608 * inode cleanup for us, so we can safely abort without any further action.
1610 static void ext4_orphan_cleanup(struct super_block *sb,
1611 struct ext4_super_block *es)
1613 unsigned int s_flags = sb->s_flags;
1614 int nr_orphans = 0, nr_truncates = 0;
1618 if (!es->s_last_orphan) {
1619 jbd_debug(4, "no orphan inodes to clean up\n");
1623 if (bdev_read_only(sb->s_bdev)) {
1624 printk(KERN_ERR "EXT4-fs: write access "
1625 "unavailable, skipping orphan cleanup.\n");
1629 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1630 if (es->s_last_orphan)
1631 jbd_debug(1, "Errors on filesystem, "
1632 "clearing orphan list.\n");
1633 es->s_last_orphan = 0;
1634 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1638 if (s_flags & MS_RDONLY) {
1639 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1641 sb->s_flags &= ~MS_RDONLY;
1644 /* Needed for iput() to work correctly and not trash data */
1645 sb->s_flags |= MS_ACTIVE;
1646 /* Turn on quotas so that they are updated correctly */
1647 for (i = 0; i < MAXQUOTAS; i++) {
1648 if (EXT4_SB(sb)->s_qf_names[i]) {
1649 int ret = ext4_quota_on_mount(sb, i);
1652 "EXT4-fs: Cannot turn on journaled "
1653 "quota: error %d\n", ret);
1658 while (es->s_last_orphan) {
1659 struct inode *inode;
1661 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1662 if (IS_ERR(inode)) {
1663 es->s_last_orphan = 0;
1667 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1669 if (inode->i_nlink) {
1671 "%s: truncating inode %lu to %lld bytes\n",
1672 __func__, inode->i_ino, inode->i_size);
1673 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1674 inode->i_ino, inode->i_size);
1675 ext4_truncate(inode);
1679 "%s: deleting unreferenced inode %lu\n",
1680 __func__, inode->i_ino);
1681 jbd_debug(2, "deleting unreferenced inode %lu\n",
1685 iput(inode); /* The delete magic happens here! */
1688 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1691 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1692 sb->s_id, PLURAL(nr_orphans));
1694 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1695 sb->s_id, PLURAL(nr_truncates));
1697 /* Turn quotas off */
1698 for (i = 0; i < MAXQUOTAS; i++) {
1699 if (sb_dqopt(sb)->files[i])
1700 vfs_quota_off(sb, i, 0);
1703 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1706 * Maximal extent format file size.
1707 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1708 * extent format containers, within a sector_t, and within i_blocks
1709 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1710 * so that won't be a limiting factor.
1712 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1714 static loff_t ext4_max_size(int blkbits, int has_huge_files)
1717 loff_t upper_limit = MAX_LFS_FILESIZE;
1719 /* small i_blocks in vfs inode? */
1720 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
1722 * CONFIG_LSF is not enabled implies the inode
1723 * i_block represent total blocks in 512 bytes
1724 * 32 == size of vfs inode i_blocks * 8
1726 upper_limit = (1LL << 32) - 1;
1728 /* total blocks in file system block size */
1729 upper_limit >>= (blkbits - 9);
1730 upper_limit <<= blkbits;
1733 /* 32-bit extent-start container, ee_block */
1738 /* Sanity check against vm- & vfs- imposed limits */
1739 if (res > upper_limit)
1746 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1747 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1748 * We need to be 1 filesystem block less than the 2^48 sector limit.
1750 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
1752 loff_t res = EXT4_NDIR_BLOCKS;
1755 /* This is calculated to be the largest file size for a
1756 * dense, bitmapped file such that the total number of
1757 * sectors in the file, including data and all indirect blocks,
1758 * does not exceed 2^48 -1
1759 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1760 * total number of 512 bytes blocks of the file
1763 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
1765 * !has_huge_files or CONFIG_LSF is not enabled
1766 * implies the inode i_block represent total blocks in
1767 * 512 bytes 32 == size of vfs inode i_blocks * 8
1769 upper_limit = (1LL << 32) - 1;
1771 /* total blocks in file system block size */
1772 upper_limit >>= (bits - 9);
1776 * We use 48 bit ext4_inode i_blocks
1777 * With EXT4_HUGE_FILE_FL set the i_blocks
1778 * represent total number of blocks in
1779 * file system block size
1781 upper_limit = (1LL << 48) - 1;
1785 /* indirect blocks */
1787 /* double indirect blocks */
1788 meta_blocks += 1 + (1LL << (bits-2));
1789 /* tripple indirect blocks */
1790 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1792 upper_limit -= meta_blocks;
1793 upper_limit <<= bits;
1795 res += 1LL << (bits-2);
1796 res += 1LL << (2*(bits-2));
1797 res += 1LL << (3*(bits-2));
1799 if (res > upper_limit)
1802 if (res > MAX_LFS_FILESIZE)
1803 res = MAX_LFS_FILESIZE;
1808 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1809 ext4_fsblk_t logical_sb_block, int nr)
1811 struct ext4_sb_info *sbi = EXT4_SB(sb);
1812 ext4_group_t bg, first_meta_bg;
1815 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1817 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1819 return logical_sb_block + nr + 1;
1820 bg = sbi->s_desc_per_block * nr;
1821 if (ext4_bg_has_super(sb, bg))
1823 return (has_super + ext4_group_first_block_no(sb, bg));
1827 * ext4_get_stripe_size: Get the stripe size.
1828 * @sbi: In memory super block info
1830 * If we have specified it via mount option, then
1831 * use the mount option value. If the value specified at mount time is
1832 * greater than the blocks per group use the super block value.
1833 * If the super block value is greater than blocks per group return 0.
1834 * Allocator needs it be less than blocks per group.
1837 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1839 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1840 unsigned long stripe_width =
1841 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1843 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1844 return sbi->s_stripe;
1846 if (stripe_width <= sbi->s_blocks_per_group)
1847 return stripe_width;
1849 if (stride <= sbi->s_blocks_per_group)
1855 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
1856 __releases(kernel_lock)
1857 __acquires(kernel_lock)
1860 struct buffer_head *bh;
1861 struct ext4_super_block *es = NULL;
1862 struct ext4_sb_info *sbi;
1864 ext4_fsblk_t sb_block = get_sb_block(&data);
1865 ext4_fsblk_t logical_sb_block;
1866 unsigned long offset = 0;
1867 unsigned int journal_inum = 0;
1868 unsigned long journal_devnum = 0;
1869 unsigned long def_mount_opts;
1876 int needs_recovery, has_huge_files;
1881 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1884 sb->s_fs_info = sbi;
1885 sbi->s_mount_opt = 0;
1886 sbi->s_resuid = EXT4_DEF_RESUID;
1887 sbi->s_resgid = EXT4_DEF_RESGID;
1888 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
1889 sbi->s_sb_block = sb_block;
1893 /* Cleanup superblock name */
1894 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
1897 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1899 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1904 * The ext4 superblock will not be buffer aligned for other than 1kB
1905 * block sizes. We need to calculate the offset from buffer start.
1907 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1908 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1909 offset = do_div(logical_sb_block, blocksize);
1911 logical_sb_block = sb_block;
1914 if (!(bh = sb_bread(sb, logical_sb_block))) {
1915 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
1919 * Note: s_es must be initialized as soon as possible because
1920 * some ext4 macro-instructions depend on its value
1922 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1924 sb->s_magic = le16_to_cpu(es->s_magic);
1925 if (sb->s_magic != EXT4_SUPER_MAGIC)
1928 /* Set defaults before we parse the mount options */
1929 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1930 if (def_mount_opts & EXT4_DEFM_DEBUG)
1931 set_opt(sbi->s_mount_opt, DEBUG);
1932 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1933 set_opt(sbi->s_mount_opt, GRPID);
1934 if (def_mount_opts & EXT4_DEFM_UID16)
1935 set_opt(sbi->s_mount_opt, NO_UID32);
1936 #ifdef CONFIG_EXT4_FS_XATTR
1937 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1938 set_opt(sbi->s_mount_opt, XATTR_USER);
1940 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1941 if (def_mount_opts & EXT4_DEFM_ACL)
1942 set_opt(sbi->s_mount_opt, POSIX_ACL);
1944 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1945 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1946 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1947 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1948 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1949 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1951 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1952 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1953 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
1954 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1956 set_opt(sbi->s_mount_opt, ERRORS_RO);
1958 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1959 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1961 set_opt(sbi->s_mount_opt, RESERVATION);
1962 set_opt(sbi->s_mount_opt, BARRIER);
1965 * turn on extents feature by default in ext4 filesystem
1966 * only if feature flag already set by mkfs or tune2fs.
1967 * Use -o noextents to turn it off
1969 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
1970 set_opt(sbi->s_mount_opt, EXTENTS);
1972 ext4_warning(sb, __func__,
1973 "extents feature not enabled on this filesystem, "
1977 * enable delayed allocation by default
1978 * Use -o nodelalloc to turn it off
1980 set_opt(sbi->s_mount_opt, DELALLOC);
1983 if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum,
1987 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1988 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1990 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1991 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1992 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1993 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1995 "EXT4-fs warning: feature flags set on rev 0 fs, "
1996 "running e2fsck is recommended\n");
1999 * Check feature flags regardless of the revision level, since we
2000 * previously didn't change the revision level when setting the flags,
2001 * so there is a chance incompat flags are set on a rev 0 filesystem.
2003 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
2005 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
2006 "unsupported optional features (%x).\n",
2007 sb->s_id, le32_to_cpu(features));
2010 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
2011 if (!(sb->s_flags & MS_RDONLY) && features) {
2012 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
2013 "unsupported optional features (%x).\n",
2014 sb->s_id, le32_to_cpu(features));
2017 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2018 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2019 if (has_huge_files) {
2021 * Large file size enabled file system can only be
2022 * mount if kernel is build with CONFIG_LSF
2024 if (sizeof(root->i_blocks) < sizeof(u64) &&
2025 !(sb->s_flags & MS_RDONLY)) {
2026 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2027 "files cannot be mounted read-write "
2028 "without CONFIG_LSF.\n", sb->s_id);
2032 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2034 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2035 blocksize > EXT4_MAX_BLOCK_SIZE) {
2037 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
2038 blocksize, sb->s_id);
2042 if (sb->s_blocksize != blocksize) {
2044 /* Validate the filesystem blocksize */
2045 if (!sb_set_blocksize(sb, blocksize)) {
2046 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2052 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2053 offset = do_div(logical_sb_block, blocksize);
2054 bh = sb_bread(sb, logical_sb_block);
2057 "EXT4-fs: Can't read superblock on 2nd try.\n");
2060 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
2062 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2064 "EXT4-fs: Magic mismatch, very weird !\n");
2069 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2071 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
2073 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2074 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2075 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2077 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2078 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2079 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2080 (!is_power_of_2(sbi->s_inode_size)) ||
2081 (sbi->s_inode_size > blocksize)) {
2083 "EXT4-fs: unsupported inode size: %d\n",
2087 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2088 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2090 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2091 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2092 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2093 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2094 !is_power_of_2(sbi->s_desc_size)) {
2096 "EXT4-fs: unsupported descriptor size %lu\n",
2101 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2102 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2103 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2104 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2106 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2107 if (sbi->s_inodes_per_block == 0)
2109 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2110 sbi->s_inodes_per_block;
2111 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2113 sbi->s_mount_state = le16_to_cpu(es->s_state);
2114 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2115 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2116 for (i = 0; i < 4; i++)
2117 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2118 sbi->s_def_hash_version = es->s_def_hash_version;
2120 if (sbi->s_blocks_per_group > blocksize * 8) {
2122 "EXT4-fs: #blocks per group too big: %lu\n",
2123 sbi->s_blocks_per_group);
2126 if (sbi->s_inodes_per_group > blocksize * 8) {
2128 "EXT4-fs: #inodes per group too big: %lu\n",
2129 sbi->s_inodes_per_group);
2133 if (ext4_blocks_count(es) >
2134 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
2135 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
2136 " too large to mount safely\n", sb->s_id);
2137 if (sizeof(sector_t) < 8)
2138 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
2143 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2146 /* ensure blocks_count calculation below doesn't sign-extend */
2147 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2148 le32_to_cpu(es->s_first_data_block) + 1) {
2149 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2150 "first data block %u, blocks per group %lu\n",
2151 ext4_blocks_count(es),
2152 le32_to_cpu(es->s_first_data_block),
2153 EXT4_BLOCKS_PER_GROUP(sb));
2156 blocks_count = (ext4_blocks_count(es) -
2157 le32_to_cpu(es->s_first_data_block) +
2158 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2159 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2160 sbi->s_groups_count = blocks_count;
2161 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2162 EXT4_DESC_PER_BLOCK(sb);
2163 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
2165 if (sbi->s_group_desc == NULL) {
2166 printk(KERN_ERR "EXT4-fs: not enough memory\n");
2170 #ifdef CONFIG_PROC_FS
2172 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2175 proc_create_data("inode_readahead_blks", 0644, sbi->s_proc,
2177 &sbi->s_inode_readahead_blks);
2180 bgl_lock_init(&sbi->s_blockgroup_lock);
2182 for (i = 0; i < db_count; i++) {
2183 block = descriptor_loc(sb, logical_sb_block, i);
2184 sbi->s_group_desc[i] = sb_bread(sb, block);
2185 if (!sbi->s_group_desc[i]) {
2186 printk(KERN_ERR "EXT4-fs: "
2187 "can't read group descriptor %d\n", i);
2192 if (!ext4_check_descriptors(sb)) {
2193 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
2196 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2197 if (!ext4_fill_flex_info(sb)) {
2199 "EXT4-fs: unable to initialize "
2200 "flex_bg meta info!\n");
2204 sbi->s_gdb_count = db_count;
2205 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2206 spin_lock_init(&sbi->s_next_gen_lock);
2208 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2209 ext4_count_free_blocks(sb));
2211 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2212 ext4_count_free_inodes(sb));
2215 err = percpu_counter_init(&sbi->s_dirs_counter,
2216 ext4_count_dirs(sb));
2219 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2222 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2226 sbi->s_stripe = ext4_get_stripe_size(sbi);
2229 * set up enough so that it can read an inode
2231 sb->s_op = &ext4_sops;
2232 sb->s_export_op = &ext4_export_ops;
2233 sb->s_xattr = ext4_xattr_handlers;
2235 sb->s_qcop = &ext4_qctl_operations;
2236 sb->dq_op = &ext4_quota_operations;
2238 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2242 needs_recovery = (es->s_last_orphan != 0 ||
2243 EXT4_HAS_INCOMPAT_FEATURE(sb,
2244 EXT4_FEATURE_INCOMPAT_RECOVER));
2247 * The first inode we look at is the journal inode. Don't try
2248 * root first: it may be modified in the journal!
2250 if (!test_opt(sb, NOLOAD) &&
2251 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2252 if (ext4_load_journal(sb, es, journal_devnum))
2254 if (!(sb->s_flags & MS_RDONLY) &&
2255 EXT4_SB(sb)->s_journal->j_failed_commit) {
2256 printk(KERN_CRIT "EXT4-fs error (device %s): "
2257 "ext4_fill_super: Journal transaction "
2258 "%u is corrupt\n", sb->s_id,
2259 EXT4_SB(sb)->s_journal->j_failed_commit);
2260 if (test_opt(sb, ERRORS_RO)) {
2262 "Mounting filesystem read-only\n");
2263 sb->s_flags |= MS_RDONLY;
2264 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2265 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2267 if (test_opt(sb, ERRORS_PANIC)) {
2268 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2269 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2270 ext4_commit_super(sb, es, 1);
2272 "EXT4-fs (device %s): mount failed\n",
2277 } else if (journal_inum) {
2278 if (ext4_create_journal(sb, es, journal_inum))
2283 "ext4: No journal on filesystem on %s\n",
2288 if (ext4_blocks_count(es) > 0xffffffffULL &&
2289 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2290 JBD2_FEATURE_INCOMPAT_64BIT)) {
2291 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2295 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2296 jbd2_journal_set_features(sbi->s_journal,
2297 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2298 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2299 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2300 jbd2_journal_set_features(sbi->s_journal,
2301 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2302 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2303 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2305 jbd2_journal_clear_features(sbi->s_journal,
2306 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2307 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2310 /* We have now updated the journal if required, so we can
2311 * validate the data journaling mode. */
2312 switch (test_opt(sb, DATA_FLAGS)) {
2314 /* No mode set, assume a default based on the journal
2315 * capabilities: ORDERED_DATA if the journal can
2316 * cope, else JOURNAL_DATA
2318 if (jbd2_journal_check_available_features
2319 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2320 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2322 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2325 case EXT4_MOUNT_ORDERED_DATA:
2326 case EXT4_MOUNT_WRITEBACK_DATA:
2327 if (!jbd2_journal_check_available_features
2328 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2329 printk(KERN_ERR "EXT4-fs: Journal does not support "
2330 "requested data journaling mode\n");
2337 if (test_opt(sb, NOBH)) {
2338 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2339 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
2340 "its supported only with writeback mode\n");
2341 clear_opt(sbi->s_mount_opt, NOBH);
2345 * The jbd2_journal_load will have done any necessary log recovery,
2346 * so we can safely mount the rest of the filesystem now.
2349 root = ext4_iget(sb, EXT4_ROOT_INO);
2351 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
2352 ret = PTR_ERR(root);
2355 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2357 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
2360 sb->s_root = d_alloc_root(root);
2362 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2368 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
2370 /* determine the minimum size of new large inodes, if present */
2371 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2372 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2373 EXT4_GOOD_OLD_INODE_SIZE;
2374 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2375 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2376 if (sbi->s_want_extra_isize <
2377 le16_to_cpu(es->s_want_extra_isize))
2378 sbi->s_want_extra_isize =
2379 le16_to_cpu(es->s_want_extra_isize);
2380 if (sbi->s_want_extra_isize <
2381 le16_to_cpu(es->s_min_extra_isize))
2382 sbi->s_want_extra_isize =
2383 le16_to_cpu(es->s_min_extra_isize);
2386 /* Check if enough inode space is available */
2387 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2388 sbi->s_inode_size) {
2389 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2390 EXT4_GOOD_OLD_INODE_SIZE;
2391 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2395 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2396 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2397 "requested data journaling mode\n");
2398 clear_opt(sbi->s_mount_opt, DELALLOC);
2399 } else if (test_opt(sb, DELALLOC))
2400 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2403 err = ext4_mb_init(sb, needs_recovery);
2405 printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
2411 * akpm: core read_super() calls in here with the superblock locked.
2412 * That deadlocks, because orphan cleanup needs to lock the superblock
2413 * in numerous places. Here we just pop the lock - it's relatively
2414 * harmless, because we are now ready to accept write_super() requests,
2415 * and aviro says that's the only reason for hanging onto the
2418 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2419 ext4_orphan_cleanup(sb, es);
2420 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2422 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
2423 ext4_mark_recovery_complete(sb, es);
2424 printk(KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2425 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2426 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2434 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
2439 jbd2_journal_destroy(sbi->s_journal);
2440 sbi->s_journal = NULL;
2442 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2443 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2444 percpu_counter_destroy(&sbi->s_dirs_counter);
2445 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
2447 for (i = 0; i < db_count; i++)
2448 brelse(sbi->s_group_desc[i]);
2449 kfree(sbi->s_group_desc);
2452 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
2453 remove_proc_entry(sb->s_id, ext4_proc_root);
2456 for (i = 0; i < MAXQUOTAS; i++)
2457 kfree(sbi->s_qf_names[i]);
2459 ext4_blkdev_remove(sbi);
2462 sb->s_fs_info = NULL;
2469 * Setup any per-fs journal parameters now. We'll do this both on
2470 * initial mount, once the journal has been initialised but before we've
2471 * done any recovery; and again on any subsequent remount.
2473 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2475 struct ext4_sb_info *sbi = EXT4_SB(sb);
2477 if (sbi->s_commit_interval)
2478 journal->j_commit_interval = sbi->s_commit_interval;
2479 /* We could also set up an ext4-specific default for the commit
2480 * interval here, but for now we'll just fall back to the jbd
2483 spin_lock(&journal->j_state_lock);
2484 if (test_opt(sb, BARRIER))
2485 journal->j_flags |= JBD2_BARRIER;
2487 journal->j_flags &= ~JBD2_BARRIER;
2488 if (test_opt(sb, DATA_ERR_ABORT))
2489 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
2491 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
2492 spin_unlock(&journal->j_state_lock);
2495 static journal_t *ext4_get_journal(struct super_block *sb,
2496 unsigned int journal_inum)
2498 struct inode *journal_inode;
2501 /* First, test for the existence of a valid inode on disk. Bad
2502 * things happen if we iget() an unused inode, as the subsequent
2503 * iput() will try to delete it. */
2505 journal_inode = ext4_iget(sb, journal_inum);
2506 if (IS_ERR(journal_inode)) {
2507 printk(KERN_ERR "EXT4-fs: no journal found.\n");
2510 if (!journal_inode->i_nlink) {
2511 make_bad_inode(journal_inode);
2512 iput(journal_inode);
2513 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
2517 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
2518 journal_inode, journal_inode->i_size);
2519 if (!S_ISREG(journal_inode->i_mode)) {
2520 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
2521 iput(journal_inode);
2525 journal = jbd2_journal_init_inode(journal_inode);
2527 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
2528 iput(journal_inode);
2531 journal->j_private = sb;
2532 ext4_init_journal_params(sb, journal);
2536 static journal_t *ext4_get_dev_journal(struct super_block *sb,
2539 struct buffer_head *bh;
2543 int hblock, blocksize;
2544 ext4_fsblk_t sb_block;
2545 unsigned long offset;
2546 struct ext4_super_block *es;
2547 struct block_device *bdev;
2549 bdev = ext4_blkdev_get(j_dev);
2553 if (bd_claim(bdev, sb)) {
2555 "EXT4: failed to claim external journal device.\n");
2560 blocksize = sb->s_blocksize;
2561 hblock = bdev_hardsect_size(bdev);
2562 if (blocksize < hblock) {
2564 "EXT4-fs: blocksize too small for journal device.\n");
2568 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2569 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2570 set_blocksize(bdev, blocksize);
2571 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2572 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2573 "external journal\n");
2577 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2578 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2579 !(le32_to_cpu(es->s_feature_incompat) &
2580 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2581 printk(KERN_ERR "EXT4-fs: external journal has "
2582 "bad superblock\n");
2587 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2588 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2593 len = ext4_blocks_count(es);
2594 start = sb_block + 1;
2595 brelse(bh); /* we're done with the superblock */
2597 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2598 start, len, blocksize);
2600 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2603 journal->j_private = sb;
2604 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2605 wait_on_buffer(journal->j_sb_buffer);
2606 if (!buffer_uptodate(journal->j_sb_buffer)) {
2607 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2610 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2611 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2612 "user (unsupported) - %d\n",
2613 be32_to_cpu(journal->j_superblock->s_nr_users));
2616 EXT4_SB(sb)->journal_bdev = bdev;
2617 ext4_init_journal_params(sb, journal);
2620 jbd2_journal_destroy(journal);
2622 ext4_blkdev_put(bdev);
2626 static int ext4_load_journal(struct super_block *sb,
2627 struct ext4_super_block *es,
2628 unsigned long journal_devnum)
2631 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2634 int really_read_only;
2636 if (journal_devnum &&
2637 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2638 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2639 "numbers have changed\n");
2640 journal_dev = new_decode_dev(journal_devnum);
2642 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2644 really_read_only = bdev_read_only(sb->s_bdev);
2647 * Are we loading a blank journal or performing recovery after a
2648 * crash? For recovery, we need to check in advance whether we
2649 * can get read-write access to the device.
2652 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2653 if (sb->s_flags & MS_RDONLY) {
2654 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2655 "required on readonly filesystem.\n");
2656 if (really_read_only) {
2657 printk(KERN_ERR "EXT4-fs: write access "
2658 "unavailable, cannot proceed.\n");
2661 printk(KERN_INFO "EXT4-fs: write access will "
2662 "be enabled during recovery.\n");
2666 if (journal_inum && journal_dev) {
2667 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2668 "and inode journals!\n");
2673 if (!(journal = ext4_get_journal(sb, journal_inum)))
2676 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2680 if (journal->j_flags & JBD2_BARRIER)
2681 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
2683 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
2685 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2686 err = jbd2_journal_update_format(journal);
2688 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2689 jbd2_journal_destroy(journal);
2694 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2695 err = jbd2_journal_wipe(journal, !really_read_only);
2697 err = jbd2_journal_load(journal);
2700 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2701 jbd2_journal_destroy(journal);
2705 EXT4_SB(sb)->s_journal = journal;
2706 ext4_clear_journal_err(sb, es);
2708 if (journal_devnum &&
2709 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2710 es->s_journal_dev = cpu_to_le32(journal_devnum);
2713 /* Make sure we flush the recovery flag to disk. */
2714 ext4_commit_super(sb, es, 1);
2720 static int ext4_create_journal(struct super_block *sb,
2721 struct ext4_super_block *es,
2722 unsigned int journal_inum)
2727 if (sb->s_flags & MS_RDONLY) {
2728 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2729 "create journal.\n");
2733 journal = ext4_get_journal(sb, journal_inum);
2737 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2740 err = jbd2_journal_create(journal);
2742 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2743 jbd2_journal_destroy(journal);
2747 EXT4_SB(sb)->s_journal = journal;
2749 ext4_update_dynamic_rev(sb);
2750 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2751 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2753 es->s_journal_inum = cpu_to_le32(journal_inum);
2756 /* Make sure we flush the recovery flag to disk. */
2757 ext4_commit_super(sb, es, 1);
2762 static void ext4_commit_super(struct super_block *sb,
2763 struct ext4_super_block *es, int sync)
2765 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2769 if (buffer_write_io_error(sbh)) {
2771 * Oh, dear. A previous attempt to write the
2772 * superblock failed. This could happen because the
2773 * USB device was yanked out. Or it could happen to
2774 * be a transient write error and maybe the block will
2775 * be remapped. Nothing we can do but to retry the
2776 * write and hope for the best.
2778 printk(KERN_ERR "ext4: previous I/O error to "
2779 "superblock detected for %s.\n", sb->s_id);
2780 clear_buffer_write_io_error(sbh);
2781 set_buffer_uptodate(sbh);
2783 es->s_wtime = cpu_to_le32(get_seconds());
2784 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2785 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2786 BUFFER_TRACE(sbh, "marking dirty");
2787 mark_buffer_dirty(sbh);
2789 sync_dirty_buffer(sbh);
2790 if (buffer_write_io_error(sbh)) {
2791 printk(KERN_ERR "ext4: I/O error while writing "
2792 "superblock for %s.\n", sb->s_id);
2793 clear_buffer_write_io_error(sbh);
2794 set_buffer_uptodate(sbh);
2801 * Have we just finished recovery? If so, and if we are mounting (or
2802 * remounting) the filesystem readonly, then we will end up with a
2803 * consistent fs on disk. Record that fact.
2805 static void ext4_mark_recovery_complete(struct super_block *sb,
2806 struct ext4_super_block *es)
2808 journal_t *journal = EXT4_SB(sb)->s_journal;
2810 jbd2_journal_lock_updates(journal);
2811 if (jbd2_journal_flush(journal) < 0)
2815 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2816 sb->s_flags & MS_RDONLY) {
2817 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2819 ext4_commit_super(sb, es, 1);
2824 jbd2_journal_unlock_updates(journal);
2828 * If we are mounting (or read-write remounting) a filesystem whose journal
2829 * has recorded an error from a previous lifetime, move that error to the
2830 * main filesystem now.
2832 static void ext4_clear_journal_err(struct super_block *sb,
2833 struct ext4_super_block *es)
2839 journal = EXT4_SB(sb)->s_journal;
2842 * Now check for any error status which may have been recorded in the
2843 * journal by a prior ext4_error() or ext4_abort()
2846 j_errno = jbd2_journal_errno(journal);
2850 errstr = ext4_decode_error(sb, j_errno, nbuf);
2851 ext4_warning(sb, __func__, "Filesystem error recorded "
2852 "from previous mount: %s", errstr);
2853 ext4_warning(sb, __func__, "Marking fs in need of "
2854 "filesystem check.");
2856 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2857 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2858 ext4_commit_super(sb, es, 1);
2860 jbd2_journal_clear_err(journal);
2865 * Force the running and committing transactions to commit,
2866 * and wait on the commit.
2868 int ext4_force_commit(struct super_block *sb)
2873 if (sb->s_flags & MS_RDONLY)
2876 journal = EXT4_SB(sb)->s_journal;
2878 ret = ext4_journal_force_commit(journal);
2883 * Ext4 always journals updates to the superblock itself, so we don't
2884 * have to propagate any other updates to the superblock on disk at this
2885 * point. Just start an async writeback to get the buffers on their way
2888 * This implicitly triggers the writebehind on sync().
2891 static void ext4_write_super(struct super_block *sb)
2893 if (mutex_trylock(&sb->s_lock) != 0)
2898 static int ext4_sync_fs(struct super_block *sb, int wait)
2902 trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
2904 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2906 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2912 * LVM calls this function before a (read-only) snapshot is created. This
2913 * gives us a chance to flush the journal completely and mark the fs clean.
2915 static void ext4_write_super_lockfs(struct super_block *sb)
2919 if (!(sb->s_flags & MS_RDONLY)) {
2920 journal_t *journal = EXT4_SB(sb)->s_journal;
2922 /* Now we set up the journal barrier. */
2923 jbd2_journal_lock_updates(journal);
2926 * We don't want to clear needs_recovery flag when we failed
2927 * to flush the journal.
2929 if (jbd2_journal_flush(journal) < 0)
2932 /* Journal blocked and flushed, clear needs_recovery flag. */
2933 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2934 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2939 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2940 * flag here, even though the filesystem is not technically dirty yet.
2942 static void ext4_unlockfs(struct super_block *sb)
2944 if (!(sb->s_flags & MS_RDONLY)) {
2946 /* Reser the needs_recovery flag before the fs is unlocked. */
2947 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2948 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2950 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2954 static int ext4_remount(struct super_block *sb, int *flags, char *data)
2956 struct ext4_super_block *es;
2957 struct ext4_sb_info *sbi = EXT4_SB(sb);
2958 ext4_fsblk_t n_blocks_count = 0;
2959 unsigned long old_sb_flags;
2960 struct ext4_mount_options old_opts;
2967 /* Store the original options */
2968 old_sb_flags = sb->s_flags;
2969 old_opts.s_mount_opt = sbi->s_mount_opt;
2970 old_opts.s_resuid = sbi->s_resuid;
2971 old_opts.s_resgid = sbi->s_resgid;
2972 old_opts.s_commit_interval = sbi->s_commit_interval;
2974 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2975 for (i = 0; i < MAXQUOTAS; i++)
2976 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2980 * Allow the "check" option to be passed as a remount option.
2982 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2987 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2988 ext4_abort(sb, __func__, "Abort forced by user");
2990 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2991 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2995 ext4_init_journal_params(sb, sbi->s_journal);
2997 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2998 n_blocks_count > ext4_blocks_count(es)) {
2999 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
3004 if (*flags & MS_RDONLY) {
3006 * First of all, the unconditional stuff we have to do
3007 * to disable replay of the journal when we next remount
3009 sb->s_flags |= MS_RDONLY;
3012 * OK, test if we are remounting a valid rw partition
3013 * readonly, and if so set the rdonly flag and then
3014 * mark the partition as valid again.
3016 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3017 (sbi->s_mount_state & EXT4_VALID_FS))
3018 es->s_state = cpu_to_le16(sbi->s_mount_state);
3021 * We have to unlock super so that we can wait for
3025 ext4_mark_recovery_complete(sb, es);
3029 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3030 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3031 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3032 "remount RDWR because of unsupported "
3033 "optional features (%x).\n",
3034 sb->s_id, le32_to_cpu(ret));
3040 * Make sure the group descriptor checksums
3041 * are sane. If they aren't, refuse to
3044 for (g = 0; g < sbi->s_groups_count; g++) {
3045 struct ext4_group_desc *gdp =
3046 ext4_get_group_desc(sb, g, NULL);
3048 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3050 "EXT4-fs: ext4_remount: "
3051 "Checksum for group %lu failed (%u!=%u)\n",
3052 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3053 le16_to_cpu(gdp->bg_checksum));
3060 * If we have an unprocessed orphan list hanging
3061 * around from a previously readonly bdev mount,
3062 * require a full umount/remount for now.
3064 if (es->s_last_orphan) {
3065 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3066 "remount RDWR because of unprocessed "
3067 "orphan inode list. Please "
3068 "umount/remount instead.\n",
3075 * Mounting a RDONLY partition read-write, so reread
3076 * and store the current valid flag. (It may have
3077 * been changed by e2fsck since we originally mounted
3080 ext4_clear_journal_err(sb, es);
3081 sbi->s_mount_state = le16_to_cpu(es->s_state);
3082 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
3084 if (!ext4_setup_super(sb, es, 0))
3085 sb->s_flags &= ~MS_RDONLY;
3089 /* Release old quota file names */
3090 for (i = 0; i < MAXQUOTAS; i++)
3091 if (old_opts.s_qf_names[i] &&
3092 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3093 kfree(old_opts.s_qf_names[i]);
3097 sb->s_flags = old_sb_flags;
3098 sbi->s_mount_opt = old_opts.s_mount_opt;
3099 sbi->s_resuid = old_opts.s_resuid;
3100 sbi->s_resgid = old_opts.s_resgid;
3101 sbi->s_commit_interval = old_opts.s_commit_interval;
3103 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3104 for (i = 0; i < MAXQUOTAS; i++) {
3105 if (sbi->s_qf_names[i] &&
3106 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3107 kfree(sbi->s_qf_names[i]);
3108 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3114 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
3116 struct super_block *sb = dentry->d_sb;
3117 struct ext4_sb_info *sbi = EXT4_SB(sb);
3118 struct ext4_super_block *es = sbi->s_es;
3121 if (test_opt(sb, MINIX_DF)) {
3122 sbi->s_overhead_last = 0;
3123 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
3124 ext4_group_t ngroups = sbi->s_groups_count, i;
3125 ext4_fsblk_t overhead = 0;
3129 * Compute the overhead (FS structures). This is constant
3130 * for a given filesystem unless the number of block groups
3131 * changes so we cache the previous value until it does.
3135 * All of the blocks before first_data_block are
3138 overhead = le32_to_cpu(es->s_first_data_block);
3141 * Add the overhead attributed to the superblock and
3142 * block group descriptors. If the sparse superblocks
3143 * feature is turned on, then not all groups have this.
3145 for (i = 0; i < ngroups; i++) {
3146 overhead += ext4_bg_has_super(sb, i) +
3147 ext4_bg_num_gdb(sb, i);
3152 * Every block group has an inode bitmap, a block
3153 * bitmap, and an inode table.
3155 overhead += ngroups * (2 + sbi->s_itb_per_group);
3156 sbi->s_overhead_last = overhead;
3158 sbi->s_blocks_last = ext4_blocks_count(es);
3161 buf->f_type = EXT4_SUPER_MAGIC;
3162 buf->f_bsize = sb->s_blocksize;
3163 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
3164 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3165 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
3166 ext4_free_blocks_count_set(es, buf->f_bfree);
3167 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3168 if (buf->f_bfree < ext4_r_blocks_count(es))
3170 buf->f_files = le32_to_cpu(es->s_inodes_count);
3171 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
3172 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
3173 buf->f_namelen = EXT4_NAME_LEN;
3174 fsid = le64_to_cpup((void *)es->s_uuid) ^
3175 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3176 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3177 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
3181 /* Helper function for writing quotas on sync - we need to start transaction before quota file
3182 * is locked for write. Otherwise the are possible deadlocks:
3183 * Process 1 Process 2
3184 * ext4_create() quota_sync()
3185 * jbd2_journal_start() write_dquot()
3186 * DQUOT_INIT() down(dqio_mutex)
3187 * down(dqio_mutex) jbd2_journal_start()
3193 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3195 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3198 static int ext4_dquot_initialize(struct inode *inode, int type)
3203 /* We may create quota structure so we need to reserve enough blocks */
3204 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
3206 return PTR_ERR(handle);
3207 ret = dquot_initialize(inode, type);
3208 err = ext4_journal_stop(handle);
3214 static int ext4_dquot_drop(struct inode *inode)
3219 /* We may delete quota structure so we need to reserve enough blocks */
3220 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
3221 if (IS_ERR(handle)) {
3223 * We call dquot_drop() anyway to at least release references
3224 * to quota structures so that umount does not hang.
3227 return PTR_ERR(handle);
3229 ret = dquot_drop(inode);
3230 err = ext4_journal_stop(handle);
3236 static int ext4_write_dquot(struct dquot *dquot)
3240 struct inode *inode;
3242 inode = dquot_to_inode(dquot);
3243 handle = ext4_journal_start(inode,
3244 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3246 return PTR_ERR(handle);
3247 ret = dquot_commit(dquot);
3248 err = ext4_journal_stop(handle);
3254 static int ext4_acquire_dquot(struct dquot *dquot)
3259 handle = ext4_journal_start(dquot_to_inode(dquot),
3260 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3262 return PTR_ERR(handle);
3263 ret = dquot_acquire(dquot);
3264 err = ext4_journal_stop(handle);
3270 static int ext4_release_dquot(struct dquot *dquot)
3275 handle = ext4_journal_start(dquot_to_inode(dquot),
3276 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3277 if (IS_ERR(handle)) {
3278 /* Release dquot anyway to avoid endless cycle in dqput() */
3279 dquot_release(dquot);
3280 return PTR_ERR(handle);
3282 ret = dquot_release(dquot);
3283 err = ext4_journal_stop(handle);
3289 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3291 /* Are we journaling quotas? */
3292 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3293 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3294 dquot_mark_dquot_dirty(dquot);
3295 return ext4_write_dquot(dquot);
3297 return dquot_mark_dquot_dirty(dquot);
3301 static int ext4_write_info(struct super_block *sb, int type)
3306 /* Data block + inode block */
3307 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3309 return PTR_ERR(handle);
3310 ret = dquot_commit_info(sb, type);
3311 err = ext4_journal_stop(handle);
3318 * Turn on quotas during mount time - we need to find
3319 * the quota file and such...
3321 static int ext4_quota_on_mount(struct super_block *sb, int type)
3323 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3324 EXT4_SB(sb)->s_jquota_fmt, type);
3328 * Standard function to be called on quota_on
3330 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3331 char *path, int remount)
3334 struct nameidata nd;
3336 if (!test_opt(sb, QUOTA))
3338 /* When remounting, no checks are needed and in fact, path is NULL */
3340 return vfs_quota_on(sb, type, format_id, path, remount);
3342 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3346 /* Quotafile not on the same filesystem? */
3347 if (nd.path.mnt->mnt_sb != sb) {
3351 /* Journaling quota? */
3352 if (EXT4_SB(sb)->s_qf_names[type]) {
3353 /* Quotafile not in fs root? */
3354 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
3356 "EXT4-fs: Quota file not on filesystem root. "
3357 "Journaled quota will not work.\n");
3361 * When we journal data on quota file, we have to flush journal to see
3362 * all updates to the file when we bypass pagecache...
3364 if (ext4_should_journal_data(nd.path.dentry->d_inode)) {
3366 * We don't need to lock updates but journal_flush() could
3367 * otherwise be livelocked...
3369 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3370 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3371 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3378 err = vfs_quota_on_path(sb, type, format_id, &nd.path);
3383 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3384 * acquiring the locks... As quota files are never truncated and quota code
3385 * itself serializes the operations (and noone else should touch the files)
3386 * we don't have to be afraid of races */
3387 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3388 size_t len, loff_t off)
3390 struct inode *inode = sb_dqopt(sb)->files[type];
3391 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3393 int offset = off & (sb->s_blocksize - 1);
3396 struct buffer_head *bh;
3397 loff_t i_size = i_size_read(inode);
3401 if (off+len > i_size)
3404 while (toread > 0) {
3405 tocopy = sb->s_blocksize - offset < toread ?
3406 sb->s_blocksize - offset : toread;
3407 bh = ext4_bread(NULL, inode, blk, 0, &err);
3410 if (!bh) /* A hole? */
3411 memset(data, 0, tocopy);
3413 memcpy(data, bh->b_data+offset, tocopy);
3423 /* Write to quotafile (we know the transaction is already started and has
3424 * enough credits) */
3425 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3426 const char *data, size_t len, loff_t off)
3428 struct inode *inode = sb_dqopt(sb)->files[type];
3429 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3431 int offset = off & (sb->s_blocksize - 1);
3433 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3434 size_t towrite = len;
3435 struct buffer_head *bh;
3436 handle_t *handle = journal_current_handle();
3439 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
3440 " cancelled because transaction is not started.\n",
3441 (unsigned long long)off, (unsigned long long)len);
3444 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3445 while (towrite > 0) {
3446 tocopy = sb->s_blocksize - offset < towrite ?
3447 sb->s_blocksize - offset : towrite;
3448 bh = ext4_bread(handle, inode, blk, 1, &err);
3451 if (journal_quota) {
3452 err = ext4_journal_get_write_access(handle, bh);
3459 memcpy(bh->b_data+offset, data, tocopy);
3460 flush_dcache_page(bh->b_page);
3463 err = ext4_journal_dirty_metadata(handle, bh);
3465 /* Always do at least ordered writes for quotas */
3466 err = ext4_jbd2_file_inode(handle, inode);
3467 mark_buffer_dirty(bh);
3478 if (len == towrite) {
3479 mutex_unlock(&inode->i_mutex);
3482 if (inode->i_size < off+len-towrite) {
3483 i_size_write(inode, off+len-towrite);
3484 EXT4_I(inode)->i_disksize = inode->i_size;
3486 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3487 ext4_mark_inode_dirty(handle, inode);
3488 mutex_unlock(&inode->i_mutex);
3489 return len - towrite;
3494 static int ext4_get_sb(struct file_system_type *fs_type,
3495 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3497 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3500 #ifdef CONFIG_PROC_FS
3501 static int ext4_ui_proc_show(struct seq_file *m, void *v)
3503 unsigned int *p = m->private;
3505 seq_printf(m, "%u\n", *p);
3509 static int ext4_ui_proc_open(struct inode *inode, struct file *file)
3511 return single_open(file, ext4_ui_proc_show, PDE(inode)->data);
3514 static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf,
3515 size_t cnt, loff_t *ppos)
3517 unsigned int *p = PDE(file->f_path.dentry->d_inode)->data;
3519 unsigned long value;
3521 if (cnt >= sizeof(str))
3523 if (copy_from_user(str, buf, cnt))
3525 value = simple_strtol(str, NULL, 0);
3532 const struct file_operations ext4_ui_proc_fops = {
3533 .owner = THIS_MODULE,
3534 .open = ext4_ui_proc_open,
3536 .llseek = seq_lseek,
3537 .release = single_release,
3538 .write = ext4_ui_proc_write,
3542 static struct file_system_type ext4_fs_type = {
3543 .owner = THIS_MODULE,
3545 .get_sb = ext4_get_sb,
3546 .kill_sb = kill_block_super,
3547 .fs_flags = FS_REQUIRES_DEV,
3550 #ifdef CONFIG_EXT4DEV_COMPAT
3551 static int ext4dev_get_sb(struct file_system_type *fs_type,
3552 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3554 printk(KERN_WARNING "EXT4-fs: Update your userspace programs "
3555 "to mount using ext4\n");
3556 printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility "
3557 "will go away by 2.6.31\n");
3558 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3561 static struct file_system_type ext4dev_fs_type = {
3562 .owner = THIS_MODULE,
3564 .get_sb = ext4dev_get_sb,
3565 .kill_sb = kill_block_super,
3566 .fs_flags = FS_REQUIRES_DEV,
3568 MODULE_ALIAS("ext4dev");
3571 static int __init init_ext4_fs(void)
3575 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
3576 err = init_ext4_mballoc();
3580 err = init_ext4_xattr();
3583 err = init_inodecache();
3586 err = register_filesystem(&ext4_fs_type);
3589 #ifdef CONFIG_EXT4DEV_COMPAT
3590 err = register_filesystem(&ext4dev_fs_type);
3592 unregister_filesystem(&ext4_fs_type);
3598 destroy_inodecache();
3602 exit_ext4_mballoc();
3606 static void __exit exit_ext4_fs(void)
3608 unregister_filesystem(&ext4_fs_type);
3609 #ifdef CONFIG_EXT4DEV_COMPAT
3610 unregister_filesystem(&ext4dev_fs_type);
3612 destroy_inodecache();
3614 exit_ext4_mballoc();
3615 remove_proc_entry("fs/ext4", NULL);
3618 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3619 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3620 MODULE_LICENSE("GPL");
3621 module_init(init_ext4_fs)
3622 module_exit(exit_ext4_fs)