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/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/smp_lock.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38 #include <linux/proc_fs.h>
39 #include <linux/ctype.h>
40 #include <linux/marker.h>
41 #include <linux/log2.h>
42 #include <linux/crc16.h>
43 #include <asm/uaccess.h>
46 #include "ext4_jbd2.h"
50 static int default_mb_history_length = 1000;
52 module_param_named(default_mb_history_length, default_mb_history_length,
54 MODULE_PARM_DESC(default_mb_history_length,
55 "Default number of entries saved for mb_history");
57 struct proc_dir_entry *ext4_proc_root;
58 static struct kset *ext4_kset;
60 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
61 unsigned long journal_devnum);
62 static int ext4_commit_super(struct super_block *sb, int sync);
63 static void ext4_mark_recovery_complete(struct super_block *sb,
64 struct ext4_super_block *es);
65 static void ext4_clear_journal_err(struct super_block *sb,
66 struct ext4_super_block *es);
67 static int ext4_sync_fs(struct super_block *sb, int wait);
68 static const char *ext4_decode_error(struct super_block *sb, int errno,
70 static int ext4_remount(struct super_block *sb, int *flags, char *data);
71 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
72 static int ext4_unfreeze(struct super_block *sb);
73 static void ext4_write_super(struct super_block *sb);
74 static int ext4_freeze(struct super_block *sb);
77 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
78 struct ext4_group_desc *bg)
80 return le32_to_cpu(bg->bg_block_bitmap_lo) |
81 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
82 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
85 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
86 struct ext4_group_desc *bg)
88 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
89 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
90 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
93 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
94 struct ext4_group_desc *bg)
96 return le32_to_cpu(bg->bg_inode_table_lo) |
97 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
98 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
101 __u32 ext4_free_blks_count(struct super_block *sb,
102 struct ext4_group_desc *bg)
104 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
105 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
106 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
109 __u32 ext4_free_inodes_count(struct super_block *sb,
110 struct ext4_group_desc *bg)
112 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
113 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
114 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
117 __u32 ext4_used_dirs_count(struct super_block *sb,
118 struct ext4_group_desc *bg)
120 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
121 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
122 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
125 __u32 ext4_itable_unused_count(struct super_block *sb,
126 struct ext4_group_desc *bg)
128 return le16_to_cpu(bg->bg_itable_unused_lo) |
129 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
130 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
133 void ext4_block_bitmap_set(struct super_block *sb,
134 struct ext4_group_desc *bg, ext4_fsblk_t blk)
136 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
137 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
138 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
141 void ext4_inode_bitmap_set(struct super_block *sb,
142 struct ext4_group_desc *bg, ext4_fsblk_t blk)
144 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
145 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
146 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
149 void ext4_inode_table_set(struct super_block *sb,
150 struct ext4_group_desc *bg, ext4_fsblk_t blk)
152 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
153 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
154 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
157 void ext4_free_blks_set(struct super_block *sb,
158 struct ext4_group_desc *bg, __u32 count)
160 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
161 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
162 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
165 void ext4_free_inodes_set(struct super_block *sb,
166 struct ext4_group_desc *bg, __u32 count)
168 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
169 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
170 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
173 void ext4_used_dirs_set(struct super_block *sb,
174 struct ext4_group_desc *bg, __u32 count)
176 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
177 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
178 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
181 void ext4_itable_unused_set(struct super_block *sb,
182 struct ext4_group_desc *bg, __u32 count)
184 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
185 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
186 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
190 * Wrappers for jbd2_journal_start/end.
192 * The only special thing we need to do here is to make sure that all
193 * journal_end calls result in the superblock being marked dirty, so
194 * that sync() will call the filesystem's write_super callback if
197 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
201 if (sb->s_flags & MS_RDONLY)
202 return ERR_PTR(-EROFS);
204 /* Special case here: if the journal has aborted behind our
205 * backs (eg. EIO in the commit thread), then we still need to
206 * take the FS itself readonly cleanly. */
207 journal = EXT4_SB(sb)->s_journal;
209 if (is_journal_aborted(journal)) {
210 ext4_abort(sb, __func__,
211 "Detected aborted journal");
212 return ERR_PTR(-EROFS);
214 return jbd2_journal_start(journal, nblocks);
217 * We're not journaling, return the appropriate indication.
219 current->journal_info = EXT4_NOJOURNAL_HANDLE;
220 return current->journal_info;
224 * The only special thing we need to do here is to make sure that all
225 * jbd2_journal_stop calls result in the superblock being marked dirty, so
226 * that sync() will call the filesystem's write_super callback if
229 int __ext4_journal_stop(const char *where, handle_t *handle)
231 struct super_block *sb;
235 if (!ext4_handle_valid(handle)) {
237 * Do this here since we don't call jbd2_journal_stop() in
240 current->journal_info = NULL;
243 sb = handle->h_transaction->t_journal->j_private;
245 rc = jbd2_journal_stop(handle);
250 __ext4_std_error(sb, where, err);
254 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
255 struct buffer_head *bh, handle_t *handle, int err)
258 const char *errstr = ext4_decode_error(NULL, err, nbuf);
260 BUG_ON(!ext4_handle_valid(handle));
263 BUFFER_TRACE(bh, "abort");
268 if (is_handle_aborted(handle))
271 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
272 caller, errstr, err_fn);
274 jbd2_journal_abort_handle(handle);
277 /* Deal with the reporting of failure conditions on a filesystem such as
278 * inconsistencies detected or read IO failures.
280 * On ext2, we can store the error state of the filesystem in the
281 * superblock. That is not possible on ext4, because we may have other
282 * write ordering constraints on the superblock which prevent us from
283 * writing it out straight away; and given that the journal is about to
284 * be aborted, we can't rely on the current, or future, transactions to
285 * write out the superblock safely.
287 * We'll just use the jbd2_journal_abort() error code to record an error in
288 * the journal instead. On recovery, the journal will compain about
289 * that error until we've noted it down and cleared it.
292 static void ext4_handle_error(struct super_block *sb)
294 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
296 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
297 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
299 if (sb->s_flags & MS_RDONLY)
302 if (!test_opt(sb, ERRORS_CONT)) {
303 journal_t *journal = EXT4_SB(sb)->s_journal;
305 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
307 jbd2_journal_abort(journal, -EIO);
309 if (test_opt(sb, ERRORS_RO)) {
310 printk(KERN_CRIT "Remounting filesystem read-only\n");
311 sb->s_flags |= MS_RDONLY;
313 ext4_commit_super(sb, 1);
314 if (test_opt(sb, ERRORS_PANIC))
315 panic("EXT4-fs (device %s): panic forced after error\n",
319 void ext4_error(struct super_block *sb, const char *function,
320 const char *fmt, ...)
325 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
330 ext4_handle_error(sb);
333 static const char *ext4_decode_error(struct super_block *sb, int errno,
340 errstr = "IO failure";
343 errstr = "Out of memory";
346 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
347 errstr = "Journal has aborted";
349 errstr = "Readonly filesystem";
352 /* If the caller passed in an extra buffer for unknown
353 * errors, textualise them now. Else we just return
356 /* Check for truncated error codes... */
357 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
366 /* __ext4_std_error decodes expected errors from journaling functions
367 * automatically and invokes the appropriate error response. */
369 void __ext4_std_error(struct super_block *sb, const char *function, int errno)
374 /* Special case: if the error is EROFS, and we're not already
375 * inside a transaction, then there's really no point in logging
377 if (errno == -EROFS && journal_current_handle() == NULL &&
378 (sb->s_flags & MS_RDONLY))
381 errstr = ext4_decode_error(sb, errno, nbuf);
382 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
383 sb->s_id, function, errstr);
385 ext4_handle_error(sb);
389 * ext4_abort is a much stronger failure handler than ext4_error. The
390 * abort function may be used to deal with unrecoverable failures such
391 * as journal IO errors or ENOMEM at a critical moment in log management.
393 * We unconditionally force the filesystem into an ABORT|READONLY state,
394 * unless the error response on the fs has been set to panic in which
395 * case we take the easy way out and panic immediately.
398 void ext4_abort(struct super_block *sb, const char *function,
399 const char *fmt, ...)
403 printk(KERN_CRIT "ext4_abort called.\n");
406 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
411 if (test_opt(sb, ERRORS_PANIC))
412 panic("EXT4-fs panic from previous error\n");
414 if (sb->s_flags & MS_RDONLY)
417 printk(KERN_CRIT "Remounting filesystem read-only\n");
418 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
419 sb->s_flags |= MS_RDONLY;
420 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
421 if (EXT4_SB(sb)->s_journal)
422 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
425 void ext4_warning(struct super_block *sb, const char *function,
426 const char *fmt, ...)
431 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
438 void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
439 const char *function, const char *fmt, ...)
444 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
447 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
452 if (test_opt(sb, ERRORS_CONT)) {
453 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
454 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
455 ext4_commit_super(sb, 0);
458 ext4_unlock_group(sb, grp);
459 ext4_handle_error(sb);
461 * We only get here in the ERRORS_RO case; relocking the group
462 * may be dangerous, but nothing bad will happen since the
463 * filesystem will have already been marked read/only and the
464 * journal has been aborted. We return 1 as a hint to callers
465 * who might what to use the return value from
466 * ext4_grp_locked_error() to distinguish beween the
467 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
468 * aggressively from the ext4 function in question, with a
469 * more appropriate error code.
471 ext4_lock_group(sb, grp);
476 void ext4_update_dynamic_rev(struct super_block *sb)
478 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
480 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
483 ext4_warning(sb, __func__,
484 "updating to rev %d because of new feature flag, "
485 "running e2fsck is recommended",
488 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
489 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
490 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
491 /* leave es->s_feature_*compat flags alone */
492 /* es->s_uuid will be set by e2fsck if empty */
495 * The rest of the superblock fields should be zero, and if not it
496 * means they are likely already in use, so leave them alone. We
497 * can leave it up to e2fsck to clean up any inconsistencies there.
502 * Open the external journal device
504 static struct block_device *ext4_blkdev_get(dev_t dev)
506 struct block_device *bdev;
507 char b[BDEVNAME_SIZE];
509 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
515 printk(KERN_ERR "EXT4-fs: failed to open journal device %s: %ld\n",
516 __bdevname(dev, b), PTR_ERR(bdev));
521 * Release the journal device
523 static int ext4_blkdev_put(struct block_device *bdev)
526 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
529 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
531 struct block_device *bdev;
534 bdev = sbi->journal_bdev;
536 ret = ext4_blkdev_put(bdev);
537 sbi->journal_bdev = NULL;
542 static inline struct inode *orphan_list_entry(struct list_head *l)
544 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
547 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
551 printk(KERN_ERR "sb orphan head is %d\n",
552 le32_to_cpu(sbi->s_es->s_last_orphan));
554 printk(KERN_ERR "sb_info orphan list:\n");
555 list_for_each(l, &sbi->s_orphan) {
556 struct inode *inode = orphan_list_entry(l);
558 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
559 inode->i_sb->s_id, inode->i_ino, inode,
560 inode->i_mode, inode->i_nlink,
565 static void ext4_put_super(struct super_block *sb)
567 struct ext4_sb_info *sbi = EXT4_SB(sb);
568 struct ext4_super_block *es = sbi->s_es;
572 ext4_ext_release(sb);
573 ext4_xattr_put_super(sb);
574 if (sbi->s_journal) {
575 err = jbd2_journal_destroy(sbi->s_journal);
576 sbi->s_journal = NULL;
578 ext4_abort(sb, __func__,
579 "Couldn't clean up the journal");
581 if (!(sb->s_flags & MS_RDONLY)) {
582 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
583 es->s_state = cpu_to_le16(sbi->s_mount_state);
584 ext4_commit_super(sb, 1);
587 remove_proc_entry(sb->s_id, ext4_proc_root);
589 kobject_del(&sbi->s_kobj);
591 for (i = 0; i < sbi->s_gdb_count; i++)
592 brelse(sbi->s_group_desc[i]);
593 kfree(sbi->s_group_desc);
594 if (is_vmalloc_addr(sbi->s_flex_groups))
595 vfree(sbi->s_flex_groups);
597 kfree(sbi->s_flex_groups);
598 percpu_counter_destroy(&sbi->s_freeblocks_counter);
599 percpu_counter_destroy(&sbi->s_freeinodes_counter);
600 percpu_counter_destroy(&sbi->s_dirs_counter);
601 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
604 for (i = 0; i < MAXQUOTAS; i++)
605 kfree(sbi->s_qf_names[i]);
608 /* Debugging code just in case the in-memory inode orphan list
609 * isn't empty. The on-disk one can be non-empty if we've
610 * detected an error and taken the fs readonly, but the
611 * in-memory list had better be clean by this point. */
612 if (!list_empty(&sbi->s_orphan))
613 dump_orphan_list(sb, sbi);
614 J_ASSERT(list_empty(&sbi->s_orphan));
616 invalidate_bdev(sb->s_bdev);
617 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
619 * Invalidate the journal device's buffers. We don't want them
620 * floating about in memory - the physical journal device may
621 * hotswapped, and it breaks the `ro-after' testing code.
623 sync_blockdev(sbi->journal_bdev);
624 invalidate_bdev(sbi->journal_bdev);
625 ext4_blkdev_remove(sbi);
627 sb->s_fs_info = NULL;
629 * Now that we are completely done shutting down the
630 * superblock, we need to actually destroy the kobject.
634 kobject_put(&sbi->s_kobj);
635 wait_for_completion(&sbi->s_kobj_unregister);
638 kfree(sbi->s_blockgroup_lock);
643 static struct kmem_cache *ext4_inode_cachep;
646 * Called inside transaction, so use GFP_NOFS
648 static struct inode *ext4_alloc_inode(struct super_block *sb)
650 struct ext4_inode_info *ei;
652 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
655 #ifdef CONFIG_EXT4_FS_POSIX_ACL
656 ei->i_acl = EXT4_ACL_NOT_CACHED;
657 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
659 ei->vfs_inode.i_version = 1;
660 ei->vfs_inode.i_data.writeback_index = 0;
661 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
662 INIT_LIST_HEAD(&ei->i_prealloc_list);
663 spin_lock_init(&ei->i_prealloc_lock);
665 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
666 * therefore it can be null here. Don't check it, just initialize
669 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
670 ei->i_reserved_data_blocks = 0;
671 ei->i_reserved_meta_blocks = 0;
672 ei->i_allocated_meta_blocks = 0;
673 ei->i_delalloc_reserved_flag = 0;
674 spin_lock_init(&(ei->i_block_reservation_lock));
675 return &ei->vfs_inode;
678 static void ext4_destroy_inode(struct inode *inode)
680 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
681 printk("EXT4 Inode %p: orphan list check failed!\n",
683 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
684 EXT4_I(inode), sizeof(struct ext4_inode_info),
688 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
691 static void init_once(void *foo)
693 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
695 INIT_LIST_HEAD(&ei->i_orphan);
696 #ifdef CONFIG_EXT4_FS_XATTR
697 init_rwsem(&ei->xattr_sem);
699 init_rwsem(&ei->i_data_sem);
700 inode_init_once(&ei->vfs_inode);
703 static int init_inodecache(void)
705 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
706 sizeof(struct ext4_inode_info),
707 0, (SLAB_RECLAIM_ACCOUNT|
710 if (ext4_inode_cachep == NULL)
715 static void destroy_inodecache(void)
717 kmem_cache_destroy(ext4_inode_cachep);
720 static void ext4_clear_inode(struct inode *inode)
722 #ifdef CONFIG_EXT4_FS_POSIX_ACL
723 if (EXT4_I(inode)->i_acl &&
724 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
725 posix_acl_release(EXT4_I(inode)->i_acl);
726 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
728 if (EXT4_I(inode)->i_default_acl &&
729 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
730 posix_acl_release(EXT4_I(inode)->i_default_acl);
731 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
734 ext4_discard_preallocations(inode);
735 if (EXT4_JOURNAL(inode))
736 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
737 &EXT4_I(inode)->jinode);
740 static inline void ext4_show_quota_options(struct seq_file *seq,
741 struct super_block *sb)
743 #if defined(CONFIG_QUOTA)
744 struct ext4_sb_info *sbi = EXT4_SB(sb);
746 if (sbi->s_jquota_fmt)
747 seq_printf(seq, ",jqfmt=%s",
748 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
750 if (sbi->s_qf_names[USRQUOTA])
751 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
753 if (sbi->s_qf_names[GRPQUOTA])
754 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
756 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
757 seq_puts(seq, ",usrquota");
759 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
760 seq_puts(seq, ",grpquota");
766 * - it's set to a non-default value OR
767 * - if the per-sb default is different from the global default
769 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
772 unsigned long def_mount_opts;
773 struct super_block *sb = vfs->mnt_sb;
774 struct ext4_sb_info *sbi = EXT4_SB(sb);
775 struct ext4_super_block *es = sbi->s_es;
777 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
778 def_errors = le16_to_cpu(es->s_errors);
780 if (sbi->s_sb_block != 1)
781 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
782 if (test_opt(sb, MINIX_DF))
783 seq_puts(seq, ",minixdf");
784 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
785 seq_puts(seq, ",grpid");
786 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
787 seq_puts(seq, ",nogrpid");
788 if (sbi->s_resuid != EXT4_DEF_RESUID ||
789 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
790 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
792 if (sbi->s_resgid != EXT4_DEF_RESGID ||
793 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
794 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
796 if (test_opt(sb, ERRORS_RO)) {
797 if (def_errors == EXT4_ERRORS_PANIC ||
798 def_errors == EXT4_ERRORS_CONTINUE) {
799 seq_puts(seq, ",errors=remount-ro");
802 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
803 seq_puts(seq, ",errors=continue");
804 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
805 seq_puts(seq, ",errors=panic");
806 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
807 seq_puts(seq, ",nouid32");
808 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
809 seq_puts(seq, ",debug");
810 if (test_opt(sb, OLDALLOC))
811 seq_puts(seq, ",oldalloc");
812 #ifdef CONFIG_EXT4_FS_XATTR
813 if (test_opt(sb, XATTR_USER) &&
814 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
815 seq_puts(seq, ",user_xattr");
816 if (!test_opt(sb, XATTR_USER) &&
817 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
818 seq_puts(seq, ",nouser_xattr");
821 #ifdef CONFIG_EXT4_FS_POSIX_ACL
822 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
823 seq_puts(seq, ",acl");
824 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
825 seq_puts(seq, ",noacl");
827 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
828 seq_printf(seq, ",commit=%u",
829 (unsigned) (sbi->s_commit_interval / HZ));
831 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
832 seq_printf(seq, ",min_batch_time=%u",
833 (unsigned) sbi->s_min_batch_time);
835 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
836 seq_printf(seq, ",max_batch_time=%u",
837 (unsigned) sbi->s_min_batch_time);
841 * We're changing the default of barrier mount option, so
842 * let's always display its mount state so it's clear what its
845 seq_puts(seq, ",barrier=");
846 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
847 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
848 seq_puts(seq, ",journal_async_commit");
849 if (test_opt(sb, NOBH))
850 seq_puts(seq, ",nobh");
851 if (test_opt(sb, I_VERSION))
852 seq_puts(seq, ",i_version");
853 if (!test_opt(sb, DELALLOC))
854 seq_puts(seq, ",nodelalloc");
858 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
860 * journal mode get enabled in different ways
861 * So just print the value even if we didn't specify it
863 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
864 seq_puts(seq, ",data=journal");
865 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
866 seq_puts(seq, ",data=ordered");
867 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
868 seq_puts(seq, ",data=writeback");
870 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
871 seq_printf(seq, ",inode_readahead_blks=%u",
872 sbi->s_inode_readahead_blks);
874 if (test_opt(sb, DATA_ERR_ABORT))
875 seq_puts(seq, ",data_err=abort");
877 if (test_opt(sb, NO_AUTO_DA_ALLOC))
878 seq_puts(seq, ",noauto_da_alloc");
880 ext4_show_quota_options(seq, sb);
885 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
886 u64 ino, u32 generation)
890 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
891 return ERR_PTR(-ESTALE);
892 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
893 return ERR_PTR(-ESTALE);
895 /* iget isn't really right if the inode is currently unallocated!!
897 * ext4_read_inode will return a bad_inode if the inode had been
898 * deleted, so we should be safe.
900 * Currently we don't know the generation for parent directory, so
901 * a generation of 0 means "accept any"
903 inode = ext4_iget(sb, ino);
905 return ERR_CAST(inode);
906 if (generation && inode->i_generation != generation) {
908 return ERR_PTR(-ESTALE);
914 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
915 int fh_len, int fh_type)
917 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
921 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
922 int fh_len, int fh_type)
924 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
929 * Try to release metadata pages (indirect blocks, directories) which are
930 * mapped via the block device. Since these pages could have journal heads
931 * which would prevent try_to_free_buffers() from freeing them, we must use
932 * jbd2 layer's try_to_free_buffers() function to release them.
934 static int bdev_try_to_free_page(struct super_block *sb, struct page *page, gfp_t wait)
936 journal_t *journal = EXT4_SB(sb)->s_journal;
938 WARN_ON(PageChecked(page));
939 if (!page_has_buffers(page))
942 return jbd2_journal_try_to_free_buffers(journal, page,
944 return try_to_free_buffers(page);
948 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
949 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
951 static int ext4_write_dquot(struct dquot *dquot);
952 static int ext4_acquire_dquot(struct dquot *dquot);
953 static int ext4_release_dquot(struct dquot *dquot);
954 static int ext4_mark_dquot_dirty(struct dquot *dquot);
955 static int ext4_write_info(struct super_block *sb, int type);
956 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
957 char *path, int remount);
958 static int ext4_quota_on_mount(struct super_block *sb, int type);
959 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
960 size_t len, loff_t off);
961 static ssize_t ext4_quota_write(struct super_block *sb, int type,
962 const char *data, size_t len, loff_t off);
964 static struct dquot_operations ext4_quota_operations = {
965 .initialize = dquot_initialize,
967 .alloc_space = dquot_alloc_space,
968 .reserve_space = dquot_reserve_space,
969 .claim_space = dquot_claim_space,
970 .release_rsv = dquot_release_reserved_space,
971 .get_reserved_space = ext4_get_reserved_space,
972 .alloc_inode = dquot_alloc_inode,
973 .free_space = dquot_free_space,
974 .free_inode = dquot_free_inode,
975 .transfer = dquot_transfer,
976 .write_dquot = ext4_write_dquot,
977 .acquire_dquot = ext4_acquire_dquot,
978 .release_dquot = ext4_release_dquot,
979 .mark_dirty = ext4_mark_dquot_dirty,
980 .write_info = ext4_write_info,
981 .alloc_dquot = dquot_alloc,
982 .destroy_dquot = dquot_destroy,
985 static struct quotactl_ops ext4_qctl_operations = {
986 .quota_on = ext4_quota_on,
987 .quota_off = vfs_quota_off,
988 .quota_sync = vfs_quota_sync,
989 .get_info = vfs_get_dqinfo,
990 .set_info = vfs_set_dqinfo,
991 .get_dqblk = vfs_get_dqblk,
992 .set_dqblk = vfs_set_dqblk
996 static const struct super_operations ext4_sops = {
997 .alloc_inode = ext4_alloc_inode,
998 .destroy_inode = ext4_destroy_inode,
999 .write_inode = ext4_write_inode,
1000 .dirty_inode = ext4_dirty_inode,
1001 .delete_inode = ext4_delete_inode,
1002 .put_super = ext4_put_super,
1003 .sync_fs = ext4_sync_fs,
1004 .freeze_fs = ext4_freeze,
1005 .unfreeze_fs = ext4_unfreeze,
1006 .statfs = ext4_statfs,
1007 .remount_fs = ext4_remount,
1008 .clear_inode = ext4_clear_inode,
1009 .show_options = ext4_show_options,
1011 .quota_read = ext4_quota_read,
1012 .quota_write = ext4_quota_write,
1014 .bdev_try_to_free_page = bdev_try_to_free_page,
1017 static const struct super_operations ext4_nojournal_sops = {
1018 .alloc_inode = ext4_alloc_inode,
1019 .destroy_inode = ext4_destroy_inode,
1020 .write_inode = ext4_write_inode,
1021 .dirty_inode = ext4_dirty_inode,
1022 .delete_inode = ext4_delete_inode,
1023 .write_super = ext4_write_super,
1024 .put_super = ext4_put_super,
1025 .statfs = ext4_statfs,
1026 .remount_fs = ext4_remount,
1027 .clear_inode = ext4_clear_inode,
1028 .show_options = ext4_show_options,
1030 .quota_read = ext4_quota_read,
1031 .quota_write = ext4_quota_write,
1033 .bdev_try_to_free_page = bdev_try_to_free_page,
1036 static const struct export_operations ext4_export_ops = {
1037 .fh_to_dentry = ext4_fh_to_dentry,
1038 .fh_to_parent = ext4_fh_to_parent,
1039 .get_parent = ext4_get_parent,
1043 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1044 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1045 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1046 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1047 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1048 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1049 Opt_journal_update, Opt_journal_dev,
1050 Opt_journal_checksum, Opt_journal_async_commit,
1051 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1052 Opt_data_err_abort, Opt_data_err_ignore, Opt_mb_history_length,
1053 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1054 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
1055 Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, Opt_resize,
1056 Opt_usrquota, Opt_grpquota, Opt_i_version,
1057 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
1058 Opt_inode_readahead_blks, Opt_journal_ioprio
1061 static const match_table_t tokens = {
1062 {Opt_bsd_df, "bsddf"},
1063 {Opt_minix_df, "minixdf"},
1064 {Opt_grpid, "grpid"},
1065 {Opt_grpid, "bsdgroups"},
1066 {Opt_nogrpid, "nogrpid"},
1067 {Opt_nogrpid, "sysvgroups"},
1068 {Opt_resgid, "resgid=%u"},
1069 {Opt_resuid, "resuid=%u"},
1071 {Opt_err_cont, "errors=continue"},
1072 {Opt_err_panic, "errors=panic"},
1073 {Opt_err_ro, "errors=remount-ro"},
1074 {Opt_nouid32, "nouid32"},
1075 {Opt_debug, "debug"},
1076 {Opt_oldalloc, "oldalloc"},
1077 {Opt_orlov, "orlov"},
1078 {Opt_user_xattr, "user_xattr"},
1079 {Opt_nouser_xattr, "nouser_xattr"},
1081 {Opt_noacl, "noacl"},
1082 {Opt_noload, "noload"},
1085 {Opt_commit, "commit=%u"},
1086 {Opt_min_batch_time, "min_batch_time=%u"},
1087 {Opt_max_batch_time, "max_batch_time=%u"},
1088 {Opt_journal_update, "journal=update"},
1089 {Opt_journal_dev, "journal_dev=%u"},
1090 {Opt_journal_checksum, "journal_checksum"},
1091 {Opt_journal_async_commit, "journal_async_commit"},
1092 {Opt_abort, "abort"},
1093 {Opt_data_journal, "data=journal"},
1094 {Opt_data_ordered, "data=ordered"},
1095 {Opt_data_writeback, "data=writeback"},
1096 {Opt_data_err_abort, "data_err=abort"},
1097 {Opt_data_err_ignore, "data_err=ignore"},
1098 {Opt_mb_history_length, "mb_history_length=%u"},
1099 {Opt_offusrjquota, "usrjquota="},
1100 {Opt_usrjquota, "usrjquota=%s"},
1101 {Opt_offgrpjquota, "grpjquota="},
1102 {Opt_grpjquota, "grpjquota=%s"},
1103 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1104 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1105 {Opt_grpquota, "grpquota"},
1106 {Opt_noquota, "noquota"},
1107 {Opt_quota, "quota"},
1108 {Opt_usrquota, "usrquota"},
1109 {Opt_barrier, "barrier=%u"},
1110 {Opt_barrier, "barrier"},
1111 {Opt_nobarrier, "nobarrier"},
1112 {Opt_i_version, "i_version"},
1113 {Opt_stripe, "stripe=%u"},
1114 {Opt_resize, "resize"},
1115 {Opt_delalloc, "delalloc"},
1116 {Opt_nodelalloc, "nodelalloc"},
1117 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1118 {Opt_journal_ioprio, "journal_ioprio=%u"},
1119 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1120 {Opt_auto_da_alloc, "auto_da_alloc"},
1121 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1125 static ext4_fsblk_t get_sb_block(void **data)
1127 ext4_fsblk_t sb_block;
1128 char *options = (char *) *data;
1130 if (!options || strncmp(options, "sb=", 3) != 0)
1131 return 1; /* Default location */
1133 /*todo: use simple_strtoll with >32bit ext4 */
1134 sb_block = simple_strtoul(options, &options, 0);
1135 if (*options && *options != ',') {
1136 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1140 if (*options == ',')
1142 *data = (void *) options;
1146 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1148 static int parse_options(char *options, struct super_block *sb,
1149 unsigned long *journal_devnum,
1150 unsigned int *journal_ioprio,
1151 ext4_fsblk_t *n_blocks_count, int is_remount)
1153 struct ext4_sb_info *sbi = EXT4_SB(sb);
1155 substring_t args[MAX_OPT_ARGS];
1166 while ((p = strsep(&options, ",")) != NULL) {
1171 token = match_token(p, tokens, args);
1174 clear_opt(sbi->s_mount_opt, MINIX_DF);
1177 set_opt(sbi->s_mount_opt, MINIX_DF);
1180 set_opt(sbi->s_mount_opt, GRPID);
1183 clear_opt(sbi->s_mount_opt, GRPID);
1186 if (match_int(&args[0], &option))
1188 sbi->s_resuid = option;
1191 if (match_int(&args[0], &option))
1193 sbi->s_resgid = option;
1196 /* handled by get_sb_block() instead of here */
1197 /* *sb_block = match_int(&args[0]); */
1200 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1201 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1202 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1205 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1206 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1207 set_opt(sbi->s_mount_opt, ERRORS_RO);
1210 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1211 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1212 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1215 set_opt(sbi->s_mount_opt, NO_UID32);
1218 set_opt(sbi->s_mount_opt, DEBUG);
1221 set_opt(sbi->s_mount_opt, OLDALLOC);
1224 clear_opt(sbi->s_mount_opt, OLDALLOC);
1226 #ifdef CONFIG_EXT4_FS_XATTR
1227 case Opt_user_xattr:
1228 set_opt(sbi->s_mount_opt, XATTR_USER);
1230 case Opt_nouser_xattr:
1231 clear_opt(sbi->s_mount_opt, XATTR_USER);
1234 case Opt_user_xattr:
1235 case Opt_nouser_xattr:
1236 printk(KERN_ERR "EXT4 (no)user_xattr options "
1240 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1242 set_opt(sbi->s_mount_opt, POSIX_ACL);
1245 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1250 printk(KERN_ERR "EXT4 (no)acl options "
1254 case Opt_journal_update:
1256 /* Eventually we will want to be able to create
1257 a journal file here. For now, only allow the
1258 user to specify an existing inode to be the
1261 printk(KERN_ERR "EXT4-fs: cannot specify "
1262 "journal on remount\n");
1265 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1267 case Opt_journal_dev:
1269 printk(KERN_ERR "EXT4-fs: cannot specify "
1270 "journal on remount\n");
1273 if (match_int(&args[0], &option))
1275 *journal_devnum = option;
1277 case Opt_journal_checksum:
1278 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1280 case Opt_journal_async_commit:
1281 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1282 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1285 set_opt(sbi->s_mount_opt, NOLOAD);
1288 if (match_int(&args[0], &option))
1293 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1294 sbi->s_commit_interval = HZ * option;
1296 case Opt_max_batch_time:
1297 if (match_int(&args[0], &option))
1302 option = EXT4_DEF_MAX_BATCH_TIME;
1303 sbi->s_max_batch_time = option;
1305 case Opt_min_batch_time:
1306 if (match_int(&args[0], &option))
1310 sbi->s_min_batch_time = option;
1312 case Opt_data_journal:
1313 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1315 case Opt_data_ordered:
1316 data_opt = EXT4_MOUNT_ORDERED_DATA;
1318 case Opt_data_writeback:
1319 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1322 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1325 "EXT4-fs: cannot change data "
1326 "mode on remount\n");
1330 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1331 sbi->s_mount_opt |= data_opt;
1334 case Opt_data_err_abort:
1335 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1337 case Opt_data_err_ignore:
1338 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1340 case Opt_mb_history_length:
1341 if (match_int(&args[0], &option))
1345 sbi->s_mb_history_max = option;
1354 if (sb_any_quota_loaded(sb) &&
1355 !sbi->s_qf_names[qtype]) {
1357 "EXT4-fs: Cannot change journaled "
1358 "quota options when quota turned on.\n");
1361 qname = match_strdup(&args[0]);
1364 "EXT4-fs: not enough memory for "
1365 "storing quotafile name.\n");
1368 if (sbi->s_qf_names[qtype] &&
1369 strcmp(sbi->s_qf_names[qtype], qname)) {
1371 "EXT4-fs: %s quota file already "
1372 "specified.\n", QTYPE2NAME(qtype));
1376 sbi->s_qf_names[qtype] = qname;
1377 if (strchr(sbi->s_qf_names[qtype], '/')) {
1379 "EXT4-fs: quotafile must be on "
1380 "filesystem root.\n");
1381 kfree(sbi->s_qf_names[qtype]);
1382 sbi->s_qf_names[qtype] = NULL;
1385 set_opt(sbi->s_mount_opt, QUOTA);
1387 case Opt_offusrjquota:
1390 case Opt_offgrpjquota:
1393 if (sb_any_quota_loaded(sb) &&
1394 sbi->s_qf_names[qtype]) {
1395 printk(KERN_ERR "EXT4-fs: Cannot change "
1396 "journaled quota options when "
1397 "quota turned on.\n");
1401 * The space will be released later when all options
1402 * are confirmed to be correct
1404 sbi->s_qf_names[qtype] = NULL;
1406 case Opt_jqfmt_vfsold:
1407 qfmt = QFMT_VFS_OLD;
1409 case Opt_jqfmt_vfsv0:
1412 if (sb_any_quota_loaded(sb) &&
1413 sbi->s_jquota_fmt != qfmt) {
1414 printk(KERN_ERR "EXT4-fs: Cannot change "
1415 "journaled quota options when "
1416 "quota turned on.\n");
1419 sbi->s_jquota_fmt = qfmt;
1423 set_opt(sbi->s_mount_opt, QUOTA);
1424 set_opt(sbi->s_mount_opt, USRQUOTA);
1427 set_opt(sbi->s_mount_opt, QUOTA);
1428 set_opt(sbi->s_mount_opt, GRPQUOTA);
1431 if (sb_any_quota_loaded(sb)) {
1432 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1433 "options when quota turned on.\n");
1436 clear_opt(sbi->s_mount_opt, QUOTA);
1437 clear_opt(sbi->s_mount_opt, USRQUOTA);
1438 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1445 "EXT4-fs: quota options not supported.\n");
1449 case Opt_offusrjquota:
1450 case Opt_offgrpjquota:
1451 case Opt_jqfmt_vfsold:
1452 case Opt_jqfmt_vfsv0:
1454 "EXT4-fs: journaled quota options not "
1461 set_opt(sbi->s_mount_opt, ABORT);
1464 clear_opt(sbi->s_mount_opt, BARRIER);
1467 if (match_int(&args[0], &option)) {
1468 set_opt(sbi->s_mount_opt, BARRIER);
1472 set_opt(sbi->s_mount_opt, BARRIER);
1474 clear_opt(sbi->s_mount_opt, BARRIER);
1480 printk("EXT4-fs: resize option only available "
1484 if (match_int(&args[0], &option) != 0)
1486 *n_blocks_count = option;
1489 set_opt(sbi->s_mount_opt, NOBH);
1492 clear_opt(sbi->s_mount_opt, NOBH);
1495 set_opt(sbi->s_mount_opt, I_VERSION);
1496 sb->s_flags |= MS_I_VERSION;
1498 case Opt_nodelalloc:
1499 clear_opt(sbi->s_mount_opt, DELALLOC);
1502 if (match_int(&args[0], &option))
1506 sbi->s_stripe = option;
1509 set_opt(sbi->s_mount_opt, DELALLOC);
1511 case Opt_inode_readahead_blks:
1512 if (match_int(&args[0], &option))
1514 if (option < 0 || option > (1 << 30))
1516 if (!is_power_of_2(option)) {
1517 printk(KERN_ERR "EXT4-fs: inode_readahead_blks"
1518 " must be a power of 2\n");
1521 sbi->s_inode_readahead_blks = option;
1523 case Opt_journal_ioprio:
1524 if (match_int(&args[0], &option))
1526 if (option < 0 || option > 7)
1528 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1531 case Opt_noauto_da_alloc:
1532 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1534 case Opt_auto_da_alloc:
1535 if (match_int(&args[0], &option)) {
1536 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1540 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1542 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1546 "EXT4-fs: Unrecognized mount option \"%s\" "
1547 "or missing value\n", p);
1552 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1553 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1554 sbi->s_qf_names[USRQUOTA])
1555 clear_opt(sbi->s_mount_opt, USRQUOTA);
1557 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1558 sbi->s_qf_names[GRPQUOTA])
1559 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1561 if ((sbi->s_qf_names[USRQUOTA] &&
1562 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1563 (sbi->s_qf_names[GRPQUOTA] &&
1564 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1565 printk(KERN_ERR "EXT4-fs: old and new quota "
1566 "format mixing.\n");
1570 if (!sbi->s_jquota_fmt) {
1571 printk(KERN_ERR "EXT4-fs: journaled quota format "
1572 "not specified.\n");
1576 if (sbi->s_jquota_fmt) {
1577 printk(KERN_ERR "EXT4-fs: journaled quota format "
1578 "specified with no journaling "
1587 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1590 struct ext4_sb_info *sbi = EXT4_SB(sb);
1593 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1594 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1595 "forcing read-only mode\n");
1600 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1601 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1602 "running e2fsck is recommended\n");
1603 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1605 "EXT4-fs warning: mounting fs with errors, "
1606 "running e2fsck is recommended\n");
1607 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1608 le16_to_cpu(es->s_mnt_count) >=
1609 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1611 "EXT4-fs warning: maximal mount count reached, "
1612 "running e2fsck is recommended\n");
1613 else if (le32_to_cpu(es->s_checkinterval) &&
1614 (le32_to_cpu(es->s_lastcheck) +
1615 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1617 "EXT4-fs warning: checktime reached, "
1618 "running e2fsck is recommended\n");
1619 if (!sbi->s_journal)
1620 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1621 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1622 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1623 le16_add_cpu(&es->s_mnt_count, 1);
1624 es->s_mtime = cpu_to_le32(get_seconds());
1625 ext4_update_dynamic_rev(sb);
1627 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1629 ext4_commit_super(sb, 1);
1630 if (test_opt(sb, DEBUG))
1631 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1632 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1634 sbi->s_groups_count,
1635 EXT4_BLOCKS_PER_GROUP(sb),
1636 EXT4_INODES_PER_GROUP(sb),
1639 if (EXT4_SB(sb)->s_journal) {
1640 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
1641 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1642 "external", EXT4_SB(sb)->s_journal->j_devname);
1644 printk(KERN_INFO "EXT4 FS on %s, no journal\n", sb->s_id);
1649 static int ext4_fill_flex_info(struct super_block *sb)
1651 struct ext4_sb_info *sbi = EXT4_SB(sb);
1652 struct ext4_group_desc *gdp = NULL;
1653 struct buffer_head *bh;
1654 ext4_group_t flex_group_count;
1655 ext4_group_t flex_group;
1656 int groups_per_flex = 0;
1660 if (!sbi->s_es->s_log_groups_per_flex) {
1661 sbi->s_log_groups_per_flex = 0;
1665 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1666 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1668 /* We allocate both existing and potentially added groups */
1669 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1670 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1671 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1672 size = flex_group_count * sizeof(struct flex_groups);
1673 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1674 if (sbi->s_flex_groups == NULL) {
1675 sbi->s_flex_groups = vmalloc(size);
1676 if (sbi->s_flex_groups)
1677 memset(sbi->s_flex_groups, 0, size);
1679 if (sbi->s_flex_groups == NULL) {
1680 printk(KERN_ERR "EXT4-fs: not enough memory for "
1681 "%u flex groups\n", flex_group_count);
1685 for (i = 0; i < sbi->s_groups_count; i++) {
1686 gdp = ext4_get_group_desc(sb, i, &bh);
1688 flex_group = ext4_flex_group(sbi, i);
1689 atomic_set(&sbi->s_flex_groups[flex_group].free_inodes,
1690 ext4_free_inodes_count(sb, gdp));
1691 atomic_set(&sbi->s_flex_groups[flex_group].free_blocks,
1692 ext4_free_blks_count(sb, gdp));
1693 atomic_set(&sbi->s_flex_groups[flex_group].used_dirs,
1694 ext4_used_dirs_count(sb, gdp));
1702 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1703 struct ext4_group_desc *gdp)
1707 if (sbi->s_es->s_feature_ro_compat &
1708 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1709 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1710 __le32 le_group = cpu_to_le32(block_group);
1712 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1713 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1714 crc = crc16(crc, (__u8 *)gdp, offset);
1715 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1716 /* for checksum of struct ext4_group_desc do the rest...*/
1717 if ((sbi->s_es->s_feature_incompat &
1718 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1719 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1720 crc = crc16(crc, (__u8 *)gdp + offset,
1721 le16_to_cpu(sbi->s_es->s_desc_size) -
1725 return cpu_to_le16(crc);
1728 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1729 struct ext4_group_desc *gdp)
1731 if ((sbi->s_es->s_feature_ro_compat &
1732 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1733 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1739 /* Called at mount-time, super-block is locked */
1740 static int ext4_check_descriptors(struct super_block *sb)
1742 struct ext4_sb_info *sbi = EXT4_SB(sb);
1743 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1744 ext4_fsblk_t last_block;
1745 ext4_fsblk_t block_bitmap;
1746 ext4_fsblk_t inode_bitmap;
1747 ext4_fsblk_t inode_table;
1748 int flexbg_flag = 0;
1751 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1754 ext4_debug("Checking group descriptors");
1756 for (i = 0; i < sbi->s_groups_count; i++) {
1757 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1759 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1760 last_block = ext4_blocks_count(sbi->s_es) - 1;
1762 last_block = first_block +
1763 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1765 block_bitmap = ext4_block_bitmap(sb, gdp);
1766 if (block_bitmap < first_block || block_bitmap > last_block) {
1767 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1768 "Block bitmap for group %u not in group "
1769 "(block %llu)!\n", i, block_bitmap);
1772 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1773 if (inode_bitmap < first_block || inode_bitmap > last_block) {
1774 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1775 "Inode bitmap for group %u not in group "
1776 "(block %llu)!\n", i, inode_bitmap);
1779 inode_table = ext4_inode_table(sb, gdp);
1780 if (inode_table < first_block ||
1781 inode_table + sbi->s_itb_per_group - 1 > last_block) {
1782 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1783 "Inode table for group %u not in group "
1784 "(block %llu)!\n", i, inode_table);
1787 spin_lock(sb_bgl_lock(sbi, i));
1788 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1789 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1790 "Checksum for group %u failed (%u!=%u)\n",
1791 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1792 gdp)), le16_to_cpu(gdp->bg_checksum));
1793 if (!(sb->s_flags & MS_RDONLY)) {
1794 spin_unlock(sb_bgl_lock(sbi, i));
1798 spin_unlock(sb_bgl_lock(sbi, i));
1800 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1803 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1804 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
1808 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1809 * the superblock) which were deleted from all directories, but held open by
1810 * a process at the time of a crash. We walk the list and try to delete these
1811 * inodes at recovery time (only with a read-write filesystem).
1813 * In order to keep the orphan inode chain consistent during traversal (in
1814 * case of crash during recovery), we link each inode into the superblock
1815 * orphan list_head and handle it the same way as an inode deletion during
1816 * normal operation (which journals the operations for us).
1818 * We only do an iget() and an iput() on each inode, which is very safe if we
1819 * accidentally point at an in-use or already deleted inode. The worst that
1820 * can happen in this case is that we get a "bit already cleared" message from
1821 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1822 * e2fsck was run on this filesystem, and it must have already done the orphan
1823 * inode cleanup for us, so we can safely abort without any further action.
1825 static void ext4_orphan_cleanup(struct super_block *sb,
1826 struct ext4_super_block *es)
1828 unsigned int s_flags = sb->s_flags;
1829 int nr_orphans = 0, nr_truncates = 0;
1833 if (!es->s_last_orphan) {
1834 jbd_debug(4, "no orphan inodes to clean up\n");
1838 if (bdev_read_only(sb->s_bdev)) {
1839 printk(KERN_ERR "EXT4-fs: write access "
1840 "unavailable, skipping orphan cleanup.\n");
1844 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1845 if (es->s_last_orphan)
1846 jbd_debug(1, "Errors on filesystem, "
1847 "clearing orphan list.\n");
1848 es->s_last_orphan = 0;
1849 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1853 if (s_flags & MS_RDONLY) {
1854 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1856 sb->s_flags &= ~MS_RDONLY;
1859 /* Needed for iput() to work correctly and not trash data */
1860 sb->s_flags |= MS_ACTIVE;
1861 /* Turn on quotas so that they are updated correctly */
1862 for (i = 0; i < MAXQUOTAS; i++) {
1863 if (EXT4_SB(sb)->s_qf_names[i]) {
1864 int ret = ext4_quota_on_mount(sb, i);
1867 "EXT4-fs: Cannot turn on journaled "
1868 "quota: error %d\n", ret);
1873 while (es->s_last_orphan) {
1874 struct inode *inode;
1876 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1877 if (IS_ERR(inode)) {
1878 es->s_last_orphan = 0;
1882 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1884 if (inode->i_nlink) {
1886 "%s: truncating inode %lu to %lld bytes\n",
1887 __func__, inode->i_ino, inode->i_size);
1888 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1889 inode->i_ino, inode->i_size);
1890 ext4_truncate(inode);
1894 "%s: deleting unreferenced inode %lu\n",
1895 __func__, inode->i_ino);
1896 jbd_debug(2, "deleting unreferenced inode %lu\n",
1900 iput(inode); /* The delete magic happens here! */
1903 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1906 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1907 sb->s_id, PLURAL(nr_orphans));
1909 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1910 sb->s_id, PLURAL(nr_truncates));
1912 /* Turn quotas off */
1913 for (i = 0; i < MAXQUOTAS; i++) {
1914 if (sb_dqopt(sb)->files[i])
1915 vfs_quota_off(sb, i, 0);
1918 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1921 * Maximal extent format file size.
1922 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1923 * extent format containers, within a sector_t, and within i_blocks
1924 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1925 * so that won't be a limiting factor.
1927 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1929 static loff_t ext4_max_size(int blkbits, int has_huge_files)
1932 loff_t upper_limit = MAX_LFS_FILESIZE;
1934 /* small i_blocks in vfs inode? */
1935 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
1937 * CONFIG_LBD is not enabled implies the inode
1938 * i_block represent total blocks in 512 bytes
1939 * 32 == size of vfs inode i_blocks * 8
1941 upper_limit = (1LL << 32) - 1;
1943 /* total blocks in file system block size */
1944 upper_limit >>= (blkbits - 9);
1945 upper_limit <<= blkbits;
1948 /* 32-bit extent-start container, ee_block */
1953 /* Sanity check against vm- & vfs- imposed limits */
1954 if (res > upper_limit)
1961 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1962 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1963 * We need to be 1 filesystem block less than the 2^48 sector limit.
1965 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
1967 loff_t res = EXT4_NDIR_BLOCKS;
1970 /* This is calculated to be the largest file size for a
1971 * dense, bitmapped file such that the total number of
1972 * sectors in the file, including data and all indirect blocks,
1973 * does not exceed 2^48 -1
1974 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1975 * total number of 512 bytes blocks of the file
1978 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
1980 * !has_huge_files or CONFIG_LBD is not enabled
1981 * implies the inode i_block represent total blocks in
1982 * 512 bytes 32 == size of vfs inode i_blocks * 8
1984 upper_limit = (1LL << 32) - 1;
1986 /* total blocks in file system block size */
1987 upper_limit >>= (bits - 9);
1991 * We use 48 bit ext4_inode i_blocks
1992 * With EXT4_HUGE_FILE_FL set the i_blocks
1993 * represent total number of blocks in
1994 * file system block size
1996 upper_limit = (1LL << 48) - 1;
2000 /* indirect blocks */
2002 /* double indirect blocks */
2003 meta_blocks += 1 + (1LL << (bits-2));
2004 /* tripple indirect blocks */
2005 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2007 upper_limit -= meta_blocks;
2008 upper_limit <<= bits;
2010 res += 1LL << (bits-2);
2011 res += 1LL << (2*(bits-2));
2012 res += 1LL << (3*(bits-2));
2014 if (res > upper_limit)
2017 if (res > MAX_LFS_FILESIZE)
2018 res = MAX_LFS_FILESIZE;
2023 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2024 ext4_fsblk_t logical_sb_block, int nr)
2026 struct ext4_sb_info *sbi = EXT4_SB(sb);
2027 ext4_group_t bg, first_meta_bg;
2030 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2032 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2034 return logical_sb_block + nr + 1;
2035 bg = sbi->s_desc_per_block * nr;
2036 if (ext4_bg_has_super(sb, bg))
2038 return (has_super + ext4_group_first_block_no(sb, bg));
2042 * ext4_get_stripe_size: Get the stripe size.
2043 * @sbi: In memory super block info
2045 * If we have specified it via mount option, then
2046 * use the mount option value. If the value specified at mount time is
2047 * greater than the blocks per group use the super block value.
2048 * If the super block value is greater than blocks per group return 0.
2049 * Allocator needs it be less than blocks per group.
2052 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2054 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2055 unsigned long stripe_width =
2056 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2058 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2059 return sbi->s_stripe;
2061 if (stripe_width <= sbi->s_blocks_per_group)
2062 return stripe_width;
2064 if (stride <= sbi->s_blocks_per_group)
2073 struct attribute attr;
2074 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2075 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2076 const char *, size_t);
2080 static int parse_strtoul(const char *buf,
2081 unsigned long max, unsigned long *value)
2085 while (*buf && isspace(*buf))
2087 *value = simple_strtoul(buf, &endp, 0);
2088 while (*endp && isspace(*endp))
2090 if (*endp || *value > max)
2096 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2097 struct ext4_sb_info *sbi,
2100 return snprintf(buf, PAGE_SIZE, "%llu\n",
2101 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2104 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2105 struct ext4_sb_info *sbi, char *buf)
2107 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2109 return snprintf(buf, PAGE_SIZE, "%lu\n",
2110 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2111 sbi->s_sectors_written_start) >> 1);
2114 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2115 struct ext4_sb_info *sbi, char *buf)
2117 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2119 return snprintf(buf, PAGE_SIZE, "%llu\n",
2120 sbi->s_kbytes_written +
2121 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2122 EXT4_SB(sb)->s_sectors_written_start) >> 1));
2125 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2126 struct ext4_sb_info *sbi,
2127 const char *buf, size_t count)
2131 if (parse_strtoul(buf, 0x40000000, &t))
2134 if (!is_power_of_2(t))
2137 sbi->s_inode_readahead_blks = t;
2141 static ssize_t sbi_ui_show(struct ext4_attr *a,
2142 struct ext4_sb_info *sbi, char *buf)
2144 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2146 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2149 static ssize_t sbi_ui_store(struct ext4_attr *a,
2150 struct ext4_sb_info *sbi,
2151 const char *buf, size_t count)
2153 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2156 if (parse_strtoul(buf, 0xffffffff, &t))
2162 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2163 static struct ext4_attr ext4_attr_##_name = { \
2164 .attr = {.name = __stringify(_name), .mode = _mode }, \
2167 .offset = offsetof(struct ext4_sb_info, _elname), \
2169 #define EXT4_ATTR(name, mode, show, store) \
2170 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2172 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2173 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2174 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2175 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2176 #define ATTR_LIST(name) &ext4_attr_##name.attr
2178 EXT4_RO_ATTR(delayed_allocation_blocks);
2179 EXT4_RO_ATTR(session_write_kbytes);
2180 EXT4_RO_ATTR(lifetime_write_kbytes);
2181 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2182 inode_readahead_blks_store, s_inode_readahead_blks);
2183 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2184 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2185 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2186 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2187 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2188 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2190 static struct attribute *ext4_attrs[] = {
2191 ATTR_LIST(delayed_allocation_blocks),
2192 ATTR_LIST(session_write_kbytes),
2193 ATTR_LIST(lifetime_write_kbytes),
2194 ATTR_LIST(inode_readahead_blks),
2195 ATTR_LIST(mb_stats),
2196 ATTR_LIST(mb_max_to_scan),
2197 ATTR_LIST(mb_min_to_scan),
2198 ATTR_LIST(mb_order2_req),
2199 ATTR_LIST(mb_stream_req),
2200 ATTR_LIST(mb_group_prealloc),
2204 static ssize_t ext4_attr_show(struct kobject *kobj,
2205 struct attribute *attr, char *buf)
2207 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2209 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2211 return a->show ? a->show(a, sbi, buf) : 0;
2214 static ssize_t ext4_attr_store(struct kobject *kobj,
2215 struct attribute *attr,
2216 const char *buf, size_t len)
2218 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2220 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2222 return a->store ? a->store(a, sbi, buf, len) : 0;
2225 static void ext4_sb_release(struct kobject *kobj)
2227 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2229 complete(&sbi->s_kobj_unregister);
2233 static struct sysfs_ops ext4_attr_ops = {
2234 .show = ext4_attr_show,
2235 .store = ext4_attr_store,
2238 static struct kobj_type ext4_ktype = {
2239 .default_attrs = ext4_attrs,
2240 .sysfs_ops = &ext4_attr_ops,
2241 .release = ext4_sb_release,
2244 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2245 __releases(kernel_lock)
2246 __acquires(kernel_lock)
2249 struct buffer_head *bh;
2250 struct ext4_super_block *es = NULL;
2251 struct ext4_sb_info *sbi;
2253 ext4_fsblk_t sb_block = get_sb_block(&data);
2254 ext4_fsblk_t logical_sb_block;
2255 unsigned long offset = 0;
2256 unsigned long journal_devnum = 0;
2257 unsigned long def_mount_opts;
2263 unsigned int db_count;
2265 int needs_recovery, has_huge_files;
2269 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
2271 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2275 sbi->s_blockgroup_lock =
2276 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2277 if (!sbi->s_blockgroup_lock) {
2281 sb->s_fs_info = sbi;
2282 sbi->s_mount_opt = 0;
2283 sbi->s_resuid = EXT4_DEF_RESUID;
2284 sbi->s_resgid = EXT4_DEF_RESGID;
2285 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
2286 sbi->s_sb_block = sb_block;
2287 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2292 /* Cleanup superblock name */
2293 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2296 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
2298 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
2303 * The ext4 superblock will not be buffer aligned for other than 1kB
2304 * block sizes. We need to calculate the offset from buffer start.
2306 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
2307 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2308 offset = do_div(logical_sb_block, blocksize);
2310 logical_sb_block = sb_block;
2313 if (!(bh = sb_bread(sb, logical_sb_block))) {
2314 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
2318 * Note: s_es must be initialized as soon as possible because
2319 * some ext4 macro-instructions depend on its value
2321 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2323 sb->s_magic = le16_to_cpu(es->s_magic);
2324 if (sb->s_magic != EXT4_SUPER_MAGIC)
2326 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
2328 /* Set defaults before we parse the mount options */
2329 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
2330 if (def_mount_opts & EXT4_DEFM_DEBUG)
2331 set_opt(sbi->s_mount_opt, DEBUG);
2332 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
2333 set_opt(sbi->s_mount_opt, GRPID);
2334 if (def_mount_opts & EXT4_DEFM_UID16)
2335 set_opt(sbi->s_mount_opt, NO_UID32);
2336 #ifdef CONFIG_EXT4_FS_XATTR
2337 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
2338 set_opt(sbi->s_mount_opt, XATTR_USER);
2340 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2341 if (def_mount_opts & EXT4_DEFM_ACL)
2342 set_opt(sbi->s_mount_opt, POSIX_ACL);
2344 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2345 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2346 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2347 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2348 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2349 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2351 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
2352 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
2353 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
2354 set_opt(sbi->s_mount_opt, ERRORS_CONT);
2356 set_opt(sbi->s_mount_opt, ERRORS_RO);
2358 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2359 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2360 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2361 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2362 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
2363 sbi->s_mb_history_max = default_mb_history_length;
2365 set_opt(sbi->s_mount_opt, BARRIER);
2368 * enable delayed allocation by default
2369 * Use -o nodelalloc to turn it off
2371 set_opt(sbi->s_mount_opt, DELALLOC);
2374 if (!parse_options((char *) data, sb, &journal_devnum,
2375 &journal_ioprio, NULL, 0))
2378 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2379 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2381 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2382 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2383 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2384 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
2386 "EXT4-fs warning: feature flags set on rev 0 fs, "
2387 "running e2fsck is recommended\n");
2390 * Check feature flags regardless of the revision level, since we
2391 * previously didn't change the revision level when setting the flags,
2392 * so there is a chance incompat flags are set on a rev 0 filesystem.
2394 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
2396 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
2397 "unsupported optional features (%x).\n", sb->s_id,
2398 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2399 ~EXT4_FEATURE_INCOMPAT_SUPP));
2402 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
2403 if (!(sb->s_flags & MS_RDONLY) && features) {
2404 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
2405 "unsupported optional features (%x).\n", sb->s_id,
2406 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2407 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2410 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2411 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2412 if (has_huge_files) {
2414 * Large file size enabled file system can only be
2415 * mount if kernel is build with CONFIG_LBD
2417 if (sizeof(root->i_blocks) < sizeof(u64) &&
2418 !(sb->s_flags & MS_RDONLY)) {
2419 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2420 "files cannot be mounted read-write "
2421 "without CONFIG_LBD.\n", sb->s_id);
2425 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2427 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2428 blocksize > EXT4_MAX_BLOCK_SIZE) {
2430 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
2431 blocksize, sb->s_id);
2435 if (sb->s_blocksize != blocksize) {
2437 /* Validate the filesystem blocksize */
2438 if (!sb_set_blocksize(sb, blocksize)) {
2439 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2445 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2446 offset = do_div(logical_sb_block, blocksize);
2447 bh = sb_bread(sb, logical_sb_block);
2450 "EXT4-fs: Can't read superblock on 2nd try.\n");
2453 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
2455 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2457 "EXT4-fs: Magic mismatch, very weird !\n");
2462 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2464 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
2466 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2467 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2468 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2470 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2471 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2472 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2473 (!is_power_of_2(sbi->s_inode_size)) ||
2474 (sbi->s_inode_size > blocksize)) {
2476 "EXT4-fs: unsupported inode size: %d\n",
2480 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2481 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2483 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2484 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2485 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2486 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2487 !is_power_of_2(sbi->s_desc_size)) {
2489 "EXT4-fs: unsupported descriptor size %lu\n",
2494 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2495 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2496 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2497 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2499 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2500 if (sbi->s_inodes_per_block == 0)
2502 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2503 sbi->s_inodes_per_block;
2504 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2506 sbi->s_mount_state = le16_to_cpu(es->s_state);
2507 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2508 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2509 for (i = 0; i < 4; i++)
2510 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2511 sbi->s_def_hash_version = es->s_def_hash_version;
2512 i = le32_to_cpu(es->s_flags);
2513 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2514 sbi->s_hash_unsigned = 3;
2515 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2516 #ifdef __CHAR_UNSIGNED__
2517 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2518 sbi->s_hash_unsigned = 3;
2520 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2525 if (sbi->s_blocks_per_group > blocksize * 8) {
2527 "EXT4-fs: #blocks per group too big: %lu\n",
2528 sbi->s_blocks_per_group);
2531 if (sbi->s_inodes_per_group > blocksize * 8) {
2533 "EXT4-fs: #inodes per group too big: %lu\n",
2534 sbi->s_inodes_per_group);
2538 if (ext4_blocks_count(es) >
2539 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
2540 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
2541 " too large to mount safely\n", sb->s_id);
2542 if (sizeof(sector_t) < 8)
2543 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
2548 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2551 /* check blocks count against device size */
2552 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
2553 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
2554 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu "
2555 "exceeds size of device (%llu blocks)\n",
2556 ext4_blocks_count(es), blocks_count);
2561 * It makes no sense for the first data block to be beyond the end
2562 * of the filesystem.
2564 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
2565 printk(KERN_WARNING "EXT4-fs: bad geometry: first data"
2566 "block %u is beyond end of filesystem (%llu)\n",
2567 le32_to_cpu(es->s_first_data_block),
2568 ext4_blocks_count(es));
2571 blocks_count = (ext4_blocks_count(es) -
2572 le32_to_cpu(es->s_first_data_block) +
2573 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2574 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2575 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
2576 printk(KERN_WARNING "EXT4-fs: groups count too large: %u "
2577 "(block count %llu, first data block %u, "
2578 "blocks per group %lu)\n", sbi->s_groups_count,
2579 ext4_blocks_count(es),
2580 le32_to_cpu(es->s_first_data_block),
2581 EXT4_BLOCKS_PER_GROUP(sb));
2584 sbi->s_groups_count = blocks_count;
2585 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2586 EXT4_DESC_PER_BLOCK(sb);
2587 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
2589 if (sbi->s_group_desc == NULL) {
2590 printk(KERN_ERR "EXT4-fs: not enough memory\n");
2594 #ifdef CONFIG_PROC_FS
2596 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2599 bgl_lock_init(sbi->s_blockgroup_lock);
2601 for (i = 0; i < db_count; i++) {
2602 block = descriptor_loc(sb, logical_sb_block, i);
2603 sbi->s_group_desc[i] = sb_bread(sb, block);
2604 if (!sbi->s_group_desc[i]) {
2605 printk(KERN_ERR "EXT4-fs: "
2606 "can't read group descriptor %d\n", i);
2611 if (!ext4_check_descriptors(sb)) {
2612 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
2615 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2616 if (!ext4_fill_flex_info(sb)) {
2618 "EXT4-fs: unable to initialize "
2619 "flex_bg meta info!\n");
2623 sbi->s_gdb_count = db_count;
2624 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2625 spin_lock_init(&sbi->s_next_gen_lock);
2627 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2628 ext4_count_free_blocks(sb));
2630 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2631 ext4_count_free_inodes(sb));
2634 err = percpu_counter_init(&sbi->s_dirs_counter,
2635 ext4_count_dirs(sb));
2638 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2641 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2645 sbi->s_stripe = ext4_get_stripe_size(sbi);
2648 * set up enough so that it can read an inode
2650 if (!test_opt(sb, NOLOAD) &&
2651 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
2652 sb->s_op = &ext4_sops;
2654 sb->s_op = &ext4_nojournal_sops;
2655 sb->s_export_op = &ext4_export_ops;
2656 sb->s_xattr = ext4_xattr_handlers;
2658 sb->s_qcop = &ext4_qctl_operations;
2659 sb->dq_op = &ext4_quota_operations;
2661 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2662 mutex_init(&sbi->s_orphan_lock);
2663 mutex_init(&sbi->s_resize_lock);
2667 needs_recovery = (es->s_last_orphan != 0 ||
2668 EXT4_HAS_INCOMPAT_FEATURE(sb,
2669 EXT4_FEATURE_INCOMPAT_RECOVER));
2672 * The first inode we look at is the journal inode. Don't try
2673 * root first: it may be modified in the journal!
2675 if (!test_opt(sb, NOLOAD) &&
2676 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2677 if (ext4_load_journal(sb, es, journal_devnum))
2679 if (!(sb->s_flags & MS_RDONLY) &&
2680 EXT4_SB(sb)->s_journal->j_failed_commit) {
2681 printk(KERN_CRIT "EXT4-fs error (device %s): "
2682 "ext4_fill_super: Journal transaction "
2683 "%u is corrupt\n", sb->s_id,
2684 EXT4_SB(sb)->s_journal->j_failed_commit);
2685 if (test_opt(sb, ERRORS_RO)) {
2687 "Mounting filesystem read-only\n");
2688 sb->s_flags |= MS_RDONLY;
2689 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2690 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2692 if (test_opt(sb, ERRORS_PANIC)) {
2693 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2694 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2695 ext4_commit_super(sb, 1);
2699 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2700 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2701 printk(KERN_ERR "EXT4-fs: required journal recovery "
2702 "suppressed and not mounted read-only\n");
2705 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2706 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2707 sbi->s_journal = NULL;
2712 if (ext4_blocks_count(es) > 0xffffffffULL &&
2713 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2714 JBD2_FEATURE_INCOMPAT_64BIT)) {
2715 printk(KERN_ERR "EXT4-fs: Failed to set 64-bit journal feature\n");
2719 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2720 jbd2_journal_set_features(sbi->s_journal,
2721 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2722 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2723 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2724 jbd2_journal_set_features(sbi->s_journal,
2725 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2726 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2727 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2729 jbd2_journal_clear_features(sbi->s_journal,
2730 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2731 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2734 /* We have now updated the journal if required, so we can
2735 * validate the data journaling mode. */
2736 switch (test_opt(sb, DATA_FLAGS)) {
2738 /* No mode set, assume a default based on the journal
2739 * capabilities: ORDERED_DATA if the journal can
2740 * cope, else JOURNAL_DATA
2742 if (jbd2_journal_check_available_features
2743 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2744 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2746 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2749 case EXT4_MOUNT_ORDERED_DATA:
2750 case EXT4_MOUNT_WRITEBACK_DATA:
2751 if (!jbd2_journal_check_available_features
2752 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2753 printk(KERN_ERR "EXT4-fs: Journal does not support "
2754 "requested data journaling mode\n");
2760 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
2764 if (test_opt(sb, NOBH)) {
2765 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2766 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
2767 "its supported only with writeback mode\n");
2768 clear_opt(sbi->s_mount_opt, NOBH);
2772 * The jbd2_journal_load will have done any necessary log recovery,
2773 * so we can safely mount the rest of the filesystem now.
2776 root = ext4_iget(sb, EXT4_ROOT_INO);
2778 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
2779 ret = PTR_ERR(root);
2782 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2784 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
2787 sb->s_root = d_alloc_root(root);
2789 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2795 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
2797 /* determine the minimum size of new large inodes, if present */
2798 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2799 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2800 EXT4_GOOD_OLD_INODE_SIZE;
2801 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2802 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2803 if (sbi->s_want_extra_isize <
2804 le16_to_cpu(es->s_want_extra_isize))
2805 sbi->s_want_extra_isize =
2806 le16_to_cpu(es->s_want_extra_isize);
2807 if (sbi->s_want_extra_isize <
2808 le16_to_cpu(es->s_min_extra_isize))
2809 sbi->s_want_extra_isize =
2810 le16_to_cpu(es->s_min_extra_isize);
2813 /* Check if enough inode space is available */
2814 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2815 sbi->s_inode_size) {
2816 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2817 EXT4_GOOD_OLD_INODE_SIZE;
2818 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2822 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2823 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2824 "requested data journaling mode\n");
2825 clear_opt(sbi->s_mount_opt, DELALLOC);
2826 } else if (test_opt(sb, DELALLOC))
2827 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2830 err = ext4_mb_init(sb, needs_recovery);
2832 printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
2837 sbi->s_kobj.kset = ext4_kset;
2838 init_completion(&sbi->s_kobj_unregister);
2839 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
2842 ext4_mb_release(sb);
2843 ext4_ext_release(sb);
2847 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2848 ext4_orphan_cleanup(sb, es);
2849 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2850 if (needs_recovery) {
2851 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
2852 ext4_mark_recovery_complete(sb, es);
2854 if (EXT4_SB(sb)->s_journal) {
2855 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2856 descr = " journalled data mode";
2857 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2858 descr = " ordered data mode";
2860 descr = " writeback data mode";
2862 descr = "out journal";
2864 printk(KERN_INFO "EXT4-fs: mounted filesystem %s with%s\n",
2872 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
2877 printk(KERN_ERR "EXT4-fs (device %s): mount failed\n", sb->s_id);
2878 if (sbi->s_journal) {
2879 jbd2_journal_destroy(sbi->s_journal);
2880 sbi->s_journal = NULL;
2883 if (sbi->s_flex_groups) {
2884 if (is_vmalloc_addr(sbi->s_flex_groups))
2885 vfree(sbi->s_flex_groups);
2887 kfree(sbi->s_flex_groups);
2889 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2890 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2891 percpu_counter_destroy(&sbi->s_dirs_counter);
2892 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
2894 for (i = 0; i < db_count; i++)
2895 brelse(sbi->s_group_desc[i]);
2896 kfree(sbi->s_group_desc);
2899 remove_proc_entry(sb->s_id, ext4_proc_root);
2902 for (i = 0; i < MAXQUOTAS; i++)
2903 kfree(sbi->s_qf_names[i]);
2905 ext4_blkdev_remove(sbi);
2908 sb->s_fs_info = NULL;
2915 * Setup any per-fs journal parameters now. We'll do this both on
2916 * initial mount, once the journal has been initialised but before we've
2917 * done any recovery; and again on any subsequent remount.
2919 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2921 struct ext4_sb_info *sbi = EXT4_SB(sb);
2923 journal->j_commit_interval = sbi->s_commit_interval;
2924 journal->j_min_batch_time = sbi->s_min_batch_time;
2925 journal->j_max_batch_time = sbi->s_max_batch_time;
2927 spin_lock(&journal->j_state_lock);
2928 if (test_opt(sb, BARRIER))
2929 journal->j_flags |= JBD2_BARRIER;
2931 journal->j_flags &= ~JBD2_BARRIER;
2932 if (test_opt(sb, DATA_ERR_ABORT))
2933 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
2935 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
2936 spin_unlock(&journal->j_state_lock);
2939 static journal_t *ext4_get_journal(struct super_block *sb,
2940 unsigned int journal_inum)
2942 struct inode *journal_inode;
2945 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2947 /* First, test for the existence of a valid inode on disk. Bad
2948 * things happen if we iget() an unused inode, as the subsequent
2949 * iput() will try to delete it. */
2951 journal_inode = ext4_iget(sb, journal_inum);
2952 if (IS_ERR(journal_inode)) {
2953 printk(KERN_ERR "EXT4-fs: no journal found.\n");
2956 if (!journal_inode->i_nlink) {
2957 make_bad_inode(journal_inode);
2958 iput(journal_inode);
2959 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
2963 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
2964 journal_inode, journal_inode->i_size);
2965 if (!S_ISREG(journal_inode->i_mode)) {
2966 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
2967 iput(journal_inode);
2971 journal = jbd2_journal_init_inode(journal_inode);
2973 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
2974 iput(journal_inode);
2977 journal->j_private = sb;
2978 ext4_init_journal_params(sb, journal);
2982 static journal_t *ext4_get_dev_journal(struct super_block *sb,
2985 struct buffer_head *bh;
2989 int hblock, blocksize;
2990 ext4_fsblk_t sb_block;
2991 unsigned long offset;
2992 struct ext4_super_block *es;
2993 struct block_device *bdev;
2995 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2997 bdev = ext4_blkdev_get(j_dev);
3001 if (bd_claim(bdev, sb)) {
3003 "EXT4-fs: failed to claim external journal device.\n");
3004 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
3008 blocksize = sb->s_blocksize;
3009 hblock = bdev_hardsect_size(bdev);
3010 if (blocksize < hblock) {
3012 "EXT4-fs: blocksize too small for journal device.\n");
3016 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3017 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3018 set_blocksize(bdev, blocksize);
3019 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3020 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
3021 "external journal\n");
3025 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3026 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
3027 !(le32_to_cpu(es->s_feature_incompat) &
3028 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3029 printk(KERN_ERR "EXT4-fs: external journal has "
3030 "bad superblock\n");
3035 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3036 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
3041 len = ext4_blocks_count(es);
3042 start = sb_block + 1;
3043 brelse(bh); /* we're done with the superblock */
3045 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
3046 start, len, blocksize);
3048 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
3051 journal->j_private = sb;
3052 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3053 wait_on_buffer(journal->j_sb_buffer);
3054 if (!buffer_uptodate(journal->j_sb_buffer)) {
3055 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
3058 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
3059 printk(KERN_ERR "EXT4-fs: External journal has more than one "
3060 "user (unsupported) - %d\n",
3061 be32_to_cpu(journal->j_superblock->s_nr_users));
3064 EXT4_SB(sb)->journal_bdev = bdev;
3065 ext4_init_journal_params(sb, journal);
3068 jbd2_journal_destroy(journal);
3070 ext4_blkdev_put(bdev);
3074 static int ext4_load_journal(struct super_block *sb,
3075 struct ext4_super_block *es,
3076 unsigned long journal_devnum)
3079 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3082 int really_read_only;
3084 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3086 if (journal_devnum &&
3087 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3088 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
3089 "numbers have changed\n");
3090 journal_dev = new_decode_dev(journal_devnum);
3092 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3094 really_read_only = bdev_read_only(sb->s_bdev);
3097 * Are we loading a blank journal or performing recovery after a
3098 * crash? For recovery, we need to check in advance whether we
3099 * can get read-write access to the device.
3102 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3103 if (sb->s_flags & MS_RDONLY) {
3104 printk(KERN_INFO "EXT4-fs: INFO: recovery "
3105 "required on readonly filesystem.\n");
3106 if (really_read_only) {
3107 printk(KERN_ERR "EXT4-fs: write access "
3108 "unavailable, cannot proceed.\n");
3111 printk(KERN_INFO "EXT4-fs: write access will "
3112 "be enabled during recovery.\n");
3116 if (journal_inum && journal_dev) {
3117 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
3118 "and inode journals!\n");
3123 if (!(journal = ext4_get_journal(sb, journal_inum)))
3126 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
3130 if (journal->j_flags & JBD2_BARRIER)
3131 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
3133 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
3135 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
3136 err = jbd2_journal_update_format(journal);
3138 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
3139 jbd2_journal_destroy(journal);
3144 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
3145 err = jbd2_journal_wipe(journal, !really_read_only);
3147 err = jbd2_journal_load(journal);
3150 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
3151 jbd2_journal_destroy(journal);
3155 EXT4_SB(sb)->s_journal = journal;
3156 ext4_clear_journal_err(sb, es);
3158 if (journal_devnum &&
3159 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3160 es->s_journal_dev = cpu_to_le32(journal_devnum);
3162 /* Make sure we flush the recovery flag to disk. */
3163 ext4_commit_super(sb, 1);
3169 static int ext4_commit_super(struct super_block *sb, int sync)
3171 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3172 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
3177 if (buffer_write_io_error(sbh)) {
3179 * Oh, dear. A previous attempt to write the
3180 * superblock failed. This could happen because the
3181 * USB device was yanked out. Or it could happen to
3182 * be a transient write error and maybe the block will
3183 * be remapped. Nothing we can do but to retry the
3184 * write and hope for the best.
3186 printk(KERN_ERR "EXT4-fs: previous I/O error to "
3187 "superblock detected for %s.\n", sb->s_id);
3188 clear_buffer_write_io_error(sbh);
3189 set_buffer_uptodate(sbh);
3191 es->s_wtime = cpu_to_le32(get_seconds());
3192 es->s_kbytes_written =
3193 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3194 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3195 EXT4_SB(sb)->s_sectors_written_start) >> 1));
3196 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3197 &EXT4_SB(sb)->s_freeblocks_counter));
3198 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3199 &EXT4_SB(sb)->s_freeinodes_counter));
3201 BUFFER_TRACE(sbh, "marking dirty");
3202 mark_buffer_dirty(sbh);
3204 error = sync_dirty_buffer(sbh);
3208 error = buffer_write_io_error(sbh);
3210 printk(KERN_ERR "EXT4-fs: I/O error while writing "
3211 "superblock for %s.\n", sb->s_id);
3212 clear_buffer_write_io_error(sbh);
3213 set_buffer_uptodate(sbh);
3221 * Have we just finished recovery? If so, and if we are mounting (or
3222 * remounting) the filesystem readonly, then we will end up with a
3223 * consistent fs on disk. Record that fact.
3225 static void ext4_mark_recovery_complete(struct super_block *sb,
3226 struct ext4_super_block *es)
3228 journal_t *journal = EXT4_SB(sb)->s_journal;
3230 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3231 BUG_ON(journal != NULL);
3234 jbd2_journal_lock_updates(journal);
3235 if (jbd2_journal_flush(journal) < 0)
3238 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
3239 sb->s_flags & MS_RDONLY) {
3240 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3241 ext4_commit_super(sb, 1);
3245 jbd2_journal_unlock_updates(journal);
3249 * If we are mounting (or read-write remounting) a filesystem whose journal
3250 * has recorded an error from a previous lifetime, move that error to the
3251 * main filesystem now.
3253 static void ext4_clear_journal_err(struct super_block *sb,
3254 struct ext4_super_block *es)
3260 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3262 journal = EXT4_SB(sb)->s_journal;
3265 * Now check for any error status which may have been recorded in the
3266 * journal by a prior ext4_error() or ext4_abort()
3269 j_errno = jbd2_journal_errno(journal);
3273 errstr = ext4_decode_error(sb, j_errno, nbuf);
3274 ext4_warning(sb, __func__, "Filesystem error recorded "
3275 "from previous mount: %s", errstr);
3276 ext4_warning(sb, __func__, "Marking fs in need of "
3277 "filesystem check.");
3279 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3280 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
3281 ext4_commit_super(sb, 1);
3283 jbd2_journal_clear_err(journal);
3288 * Force the running and committing transactions to commit,
3289 * and wait on the commit.
3291 int ext4_force_commit(struct super_block *sb)
3296 if (sb->s_flags & MS_RDONLY)
3299 journal = EXT4_SB(sb)->s_journal;
3301 ret = ext4_journal_force_commit(journal);
3306 static void ext4_write_super(struct super_block *sb)
3308 ext4_commit_super(sb, 1);
3311 static int ext4_sync_fs(struct super_block *sb, int wait)
3316 trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
3317 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
3319 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
3325 * LVM calls this function before a (read-only) snapshot is created. This
3326 * gives us a chance to flush the journal completely and mark the fs clean.
3328 static int ext4_freeze(struct super_block *sb)
3333 if (sb->s_flags & MS_RDONLY)
3336 journal = EXT4_SB(sb)->s_journal;
3338 /* Now we set up the journal barrier. */
3339 jbd2_journal_lock_updates(journal);
3342 * Don't clear the needs_recovery flag if we failed to flush
3345 error = jbd2_journal_flush(journal);
3348 jbd2_journal_unlock_updates(journal);
3352 /* Journal blocked and flushed, clear needs_recovery flag. */
3353 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3354 error = ext4_commit_super(sb, 1);
3361 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3362 * flag here, even though the filesystem is not technically dirty yet.
3364 static int ext4_unfreeze(struct super_block *sb)
3366 if (sb->s_flags & MS_RDONLY)
3370 /* Reset the needs_recovery flag before the fs is unlocked. */
3371 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3372 ext4_commit_super(sb, 1);
3374 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3378 static int ext4_remount(struct super_block *sb, int *flags, char *data)
3380 struct ext4_super_block *es;
3381 struct ext4_sb_info *sbi = EXT4_SB(sb);
3382 ext4_fsblk_t n_blocks_count = 0;
3383 unsigned long old_sb_flags;
3384 struct ext4_mount_options old_opts;
3386 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3392 /* Store the original options */
3393 old_sb_flags = sb->s_flags;
3394 old_opts.s_mount_opt = sbi->s_mount_opt;
3395 old_opts.s_resuid = sbi->s_resuid;
3396 old_opts.s_resgid = sbi->s_resgid;
3397 old_opts.s_commit_interval = sbi->s_commit_interval;
3398 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3399 old_opts.s_max_batch_time = sbi->s_max_batch_time;
3401 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3402 for (i = 0; i < MAXQUOTAS; i++)
3403 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3405 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3406 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
3409 * Allow the "check" option to be passed as a remount option.
3411 if (!parse_options(data, sb, NULL, &journal_ioprio,
3412 &n_blocks_count, 1)) {
3417 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
3418 ext4_abort(sb, __func__, "Abort forced by user");
3420 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3421 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
3425 if (sbi->s_journal) {
3426 ext4_init_journal_params(sb, sbi->s_journal);
3427 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3430 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
3431 n_blocks_count > ext4_blocks_count(es)) {
3432 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
3437 if (*flags & MS_RDONLY) {
3439 * First of all, the unconditional stuff we have to do
3440 * to disable replay of the journal when we next remount
3442 sb->s_flags |= MS_RDONLY;
3445 * OK, test if we are remounting a valid rw partition
3446 * readonly, and if so set the rdonly flag and then
3447 * mark the partition as valid again.
3449 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3450 (sbi->s_mount_state & EXT4_VALID_FS))
3451 es->s_state = cpu_to_le16(sbi->s_mount_state);
3454 ext4_mark_recovery_complete(sb, es);
3457 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3458 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3459 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3460 "remount RDWR because of unsupported "
3461 "optional features (%x).\n", sb->s_id,
3462 (le32_to_cpu(sbi->s_es->s_feature_ro_compat) &
3463 ~EXT4_FEATURE_RO_COMPAT_SUPP));
3469 * Make sure the group descriptor checksums
3470 * are sane. If they aren't, refuse to
3473 for (g = 0; g < sbi->s_groups_count; g++) {
3474 struct ext4_group_desc *gdp =
3475 ext4_get_group_desc(sb, g, NULL);
3477 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3479 "EXT4-fs: ext4_remount: "
3480 "Checksum for group %u failed (%u!=%u)\n",
3481 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3482 le16_to_cpu(gdp->bg_checksum));
3489 * If we have an unprocessed orphan list hanging
3490 * around from a previously readonly bdev mount,
3491 * require a full umount/remount for now.
3493 if (es->s_last_orphan) {
3494 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3495 "remount RDWR because of unprocessed "
3496 "orphan inode list. Please "
3497 "umount/remount instead.\n",
3504 * Mounting a RDONLY partition read-write, so reread
3505 * and store the current valid flag. (It may have
3506 * been changed by e2fsck since we originally mounted
3510 ext4_clear_journal_err(sb, es);
3511 sbi->s_mount_state = le16_to_cpu(es->s_state);
3512 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
3514 if (!ext4_setup_super(sb, es, 0))
3515 sb->s_flags &= ~MS_RDONLY;
3518 if (sbi->s_journal == NULL)
3519 ext4_commit_super(sb, 1);
3522 /* Release old quota file names */
3523 for (i = 0; i < MAXQUOTAS; i++)
3524 if (old_opts.s_qf_names[i] &&
3525 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3526 kfree(old_opts.s_qf_names[i]);
3530 sb->s_flags = old_sb_flags;
3531 sbi->s_mount_opt = old_opts.s_mount_opt;
3532 sbi->s_resuid = old_opts.s_resuid;
3533 sbi->s_resgid = old_opts.s_resgid;
3534 sbi->s_commit_interval = old_opts.s_commit_interval;
3535 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3536 sbi->s_max_batch_time = old_opts.s_max_batch_time;
3538 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3539 for (i = 0; i < MAXQUOTAS; i++) {
3540 if (sbi->s_qf_names[i] &&
3541 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3542 kfree(sbi->s_qf_names[i]);
3543 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3549 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
3551 struct super_block *sb = dentry->d_sb;
3552 struct ext4_sb_info *sbi = EXT4_SB(sb);
3553 struct ext4_super_block *es = sbi->s_es;
3556 if (test_opt(sb, MINIX_DF)) {
3557 sbi->s_overhead_last = 0;
3558 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
3559 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3560 ext4_fsblk_t overhead = 0;
3563 * Compute the overhead (FS structures). This is constant
3564 * for a given filesystem unless the number of block groups
3565 * changes so we cache the previous value until it does.
3569 * All of the blocks before first_data_block are
3572 overhead = le32_to_cpu(es->s_first_data_block);
3575 * Add the overhead attributed to the superblock and
3576 * block group descriptors. If the sparse superblocks
3577 * feature is turned on, then not all groups have this.
3579 for (i = 0; i < ngroups; i++) {
3580 overhead += ext4_bg_has_super(sb, i) +
3581 ext4_bg_num_gdb(sb, i);
3586 * Every block group has an inode bitmap, a block
3587 * bitmap, and an inode table.
3589 overhead += ngroups * (2 + sbi->s_itb_per_group);
3590 sbi->s_overhead_last = overhead;
3592 sbi->s_blocks_last = ext4_blocks_count(es);
3595 buf->f_type = EXT4_SUPER_MAGIC;
3596 buf->f_bsize = sb->s_blocksize;
3597 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
3598 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3599 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
3600 ext4_free_blocks_count_set(es, buf->f_bfree);
3601 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3602 if (buf->f_bfree < ext4_r_blocks_count(es))
3604 buf->f_files = le32_to_cpu(es->s_inodes_count);
3605 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
3606 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
3607 buf->f_namelen = EXT4_NAME_LEN;
3608 fsid = le64_to_cpup((void *)es->s_uuid) ^
3609 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3610 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3611 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
3615 /* Helper function for writing quotas on sync - we need to start transaction before quota file
3616 * is locked for write. Otherwise the are possible deadlocks:
3617 * Process 1 Process 2
3618 * ext4_create() quota_sync()
3619 * jbd2_journal_start() write_dquot()
3620 * vfs_dq_init() down(dqio_mutex)
3621 * down(dqio_mutex) jbd2_journal_start()
3627 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3629 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3632 static int ext4_write_dquot(struct dquot *dquot)
3636 struct inode *inode;
3638 inode = dquot_to_inode(dquot);
3639 handle = ext4_journal_start(inode,
3640 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3642 return PTR_ERR(handle);
3643 ret = dquot_commit(dquot);
3644 err = ext4_journal_stop(handle);
3650 static int ext4_acquire_dquot(struct dquot *dquot)
3655 handle = ext4_journal_start(dquot_to_inode(dquot),
3656 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3658 return PTR_ERR(handle);
3659 ret = dquot_acquire(dquot);
3660 err = ext4_journal_stop(handle);
3666 static int ext4_release_dquot(struct dquot *dquot)
3671 handle = ext4_journal_start(dquot_to_inode(dquot),
3672 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3673 if (IS_ERR(handle)) {
3674 /* Release dquot anyway to avoid endless cycle in dqput() */
3675 dquot_release(dquot);
3676 return PTR_ERR(handle);
3678 ret = dquot_release(dquot);
3679 err = ext4_journal_stop(handle);
3685 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3687 /* Are we journaling quotas? */
3688 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3689 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3690 dquot_mark_dquot_dirty(dquot);
3691 return ext4_write_dquot(dquot);
3693 return dquot_mark_dquot_dirty(dquot);
3697 static int ext4_write_info(struct super_block *sb, int type)
3702 /* Data block + inode block */
3703 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3705 return PTR_ERR(handle);
3706 ret = dquot_commit_info(sb, type);
3707 err = ext4_journal_stop(handle);
3714 * Turn on quotas during mount time - we need to find
3715 * the quota file and such...
3717 static int ext4_quota_on_mount(struct super_block *sb, int type)
3719 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3720 EXT4_SB(sb)->s_jquota_fmt, type);
3724 * Standard function to be called on quota_on
3726 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3727 char *name, int remount)
3732 if (!test_opt(sb, QUOTA))
3734 /* When remounting, no checks are needed and in fact, name is NULL */
3736 return vfs_quota_on(sb, type, format_id, name, remount);
3738 err = kern_path(name, LOOKUP_FOLLOW, &path);
3742 /* Quotafile not on the same filesystem? */
3743 if (path.mnt->mnt_sb != sb) {
3747 /* Journaling quota? */
3748 if (EXT4_SB(sb)->s_qf_names[type]) {
3749 /* Quotafile not in fs root? */
3750 if (path.dentry->d_parent != sb->s_root)
3752 "EXT4-fs: Quota file not on filesystem root. "
3753 "Journaled quota will not work.\n");
3757 * When we journal data on quota file, we have to flush journal to see
3758 * all updates to the file when we bypass pagecache...
3760 if (EXT4_SB(sb)->s_journal &&
3761 ext4_should_journal_data(path.dentry->d_inode)) {
3763 * We don't need to lock updates but journal_flush() could
3764 * otherwise be livelocked...
3766 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3767 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3768 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3775 err = vfs_quota_on_path(sb, type, format_id, &path);
3780 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3781 * acquiring the locks... As quota files are never truncated and quota code
3782 * itself serializes the operations (and noone else should touch the files)
3783 * we don't have to be afraid of races */
3784 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3785 size_t len, loff_t off)
3787 struct inode *inode = sb_dqopt(sb)->files[type];
3788 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3790 int offset = off & (sb->s_blocksize - 1);
3793 struct buffer_head *bh;
3794 loff_t i_size = i_size_read(inode);
3798 if (off+len > i_size)
3801 while (toread > 0) {
3802 tocopy = sb->s_blocksize - offset < toread ?
3803 sb->s_blocksize - offset : toread;
3804 bh = ext4_bread(NULL, inode, blk, 0, &err);
3807 if (!bh) /* A hole? */
3808 memset(data, 0, tocopy);
3810 memcpy(data, bh->b_data+offset, tocopy);
3820 /* Write to quotafile (we know the transaction is already started and has
3821 * enough credits) */
3822 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3823 const char *data, size_t len, loff_t off)
3825 struct inode *inode = sb_dqopt(sb)->files[type];
3826 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3828 int offset = off & (sb->s_blocksize - 1);
3830 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3831 size_t towrite = len;
3832 struct buffer_head *bh;
3833 handle_t *handle = journal_current_handle();
3835 if (EXT4_SB(sb)->s_journal && !handle) {
3836 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
3837 " cancelled because transaction is not started.\n",
3838 (unsigned long long)off, (unsigned long long)len);
3841 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3842 while (towrite > 0) {
3843 tocopy = sb->s_blocksize - offset < towrite ?
3844 sb->s_blocksize - offset : towrite;
3845 bh = ext4_bread(handle, inode, blk, 1, &err);
3848 if (journal_quota) {
3849 err = ext4_journal_get_write_access(handle, bh);
3856 memcpy(bh->b_data+offset, data, tocopy);
3857 flush_dcache_page(bh->b_page);
3860 err = ext4_handle_dirty_metadata(handle, NULL, bh);
3862 /* Always do at least ordered writes for quotas */
3863 err = ext4_jbd2_file_inode(handle, inode);
3864 mark_buffer_dirty(bh);
3875 if (len == towrite) {
3876 mutex_unlock(&inode->i_mutex);
3879 if (inode->i_size < off+len-towrite) {
3880 i_size_write(inode, off+len-towrite);
3881 EXT4_I(inode)->i_disksize = inode->i_size;
3883 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3884 ext4_mark_inode_dirty(handle, inode);
3885 mutex_unlock(&inode->i_mutex);
3886 return len - towrite;
3891 static int ext4_get_sb(struct file_system_type *fs_type,
3892 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3894 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3897 static struct file_system_type ext4_fs_type = {
3898 .owner = THIS_MODULE,
3900 .get_sb = ext4_get_sb,
3901 .kill_sb = kill_block_super,
3902 .fs_flags = FS_REQUIRES_DEV,
3905 #ifdef CONFIG_EXT4DEV_COMPAT
3906 static int ext4dev_get_sb(struct file_system_type *fs_type,
3907 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3909 printk(KERN_WARNING "EXT4-fs: Update your userspace programs "
3910 "to mount using ext4\n");
3911 printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility "
3912 "will go away by 2.6.31\n");
3913 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3916 static struct file_system_type ext4dev_fs_type = {
3917 .owner = THIS_MODULE,
3919 .get_sb = ext4dev_get_sb,
3920 .kill_sb = kill_block_super,
3921 .fs_flags = FS_REQUIRES_DEV,
3923 MODULE_ALIAS("ext4dev");
3926 static int __init init_ext4_fs(void)
3930 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
3933 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
3934 err = init_ext4_mballoc();
3938 err = init_ext4_xattr();
3941 err = init_inodecache();
3944 err = register_filesystem(&ext4_fs_type);
3947 #ifdef CONFIG_EXT4DEV_COMPAT
3948 err = register_filesystem(&ext4dev_fs_type);
3950 unregister_filesystem(&ext4_fs_type);
3956 destroy_inodecache();
3960 exit_ext4_mballoc();
3964 static void __exit exit_ext4_fs(void)
3966 unregister_filesystem(&ext4_fs_type);
3967 #ifdef CONFIG_EXT4DEV_COMPAT
3968 unregister_filesystem(&ext4dev_fs_type);
3970 destroy_inodecache();
3972 exit_ext4_mballoc();
3973 remove_proc_entry("fs/ext4", NULL);
3974 kset_unregister(ext4_kset);
3977 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3978 MODULE_DESCRIPTION("Fourth Extended Filesystem");
3979 MODULE_LICENSE("GPL");
3980 module_init(init_ext4_fs)
3981 module_exit(exit_ext4_fs)