2 * linux/fs/ext4/super.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/time.h>
23 #include <linux/jbd2.h>
24 #include <linux/slab.h>
25 #include <linux/init.h>
26 #include <linux/blkdev.h>
27 #include <linux/parser.h>
28 #include <linux/smp_lock.h>
29 #include <linux/buffer_head.h>
30 #include <linux/exportfs.h>
31 #include <linux/vfs.h>
32 #include <linux/random.h>
33 #include <linux/mount.h>
34 #include <linux/namei.h>
35 #include <linux/quotaops.h>
36 #include <linux/seq_file.h>
37 #include <linux/proc_fs.h>
38 #include <linux/marker.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <asm/uaccess.h>
44 #include "ext4_jbd2.h"
50 struct proc_dir_entry *ext4_proc_root;
52 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
53 unsigned long journal_devnum);
54 static int ext4_commit_super(struct super_block *sb,
55 struct ext4_super_block *es, int sync);
56 static void ext4_mark_recovery_complete(struct super_block *sb,
57 struct ext4_super_block *es);
58 static void ext4_clear_journal_err(struct super_block *sb,
59 struct ext4_super_block *es);
60 static int ext4_sync_fs(struct super_block *sb, int wait);
61 static const char *ext4_decode_error(struct super_block *sb, int errno,
63 static int ext4_remount(struct super_block *sb, int *flags, char *data);
64 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
65 static int ext4_unfreeze(struct super_block *sb);
66 static void ext4_write_super(struct super_block *sb);
67 static int ext4_freeze(struct super_block *sb);
70 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
71 struct ext4_group_desc *bg)
73 return le32_to_cpu(bg->bg_block_bitmap_lo) |
74 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
75 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
78 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
79 struct ext4_group_desc *bg)
81 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
82 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
83 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
86 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
87 struct ext4_group_desc *bg)
89 return le32_to_cpu(bg->bg_inode_table_lo) |
90 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
91 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
94 __u32 ext4_free_blks_count(struct super_block *sb,
95 struct ext4_group_desc *bg)
97 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
98 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
99 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
102 __u32 ext4_free_inodes_count(struct super_block *sb,
103 struct ext4_group_desc *bg)
105 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
106 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
107 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
110 __u32 ext4_used_dirs_count(struct super_block *sb,
111 struct ext4_group_desc *bg)
113 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
114 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
115 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
118 __u32 ext4_itable_unused_count(struct super_block *sb,
119 struct ext4_group_desc *bg)
121 return le16_to_cpu(bg->bg_itable_unused_lo) |
122 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
123 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
126 void ext4_block_bitmap_set(struct super_block *sb,
127 struct ext4_group_desc *bg, ext4_fsblk_t blk)
129 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
130 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
131 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
134 void ext4_inode_bitmap_set(struct super_block *sb,
135 struct ext4_group_desc *bg, ext4_fsblk_t blk)
137 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
138 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
139 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
142 void ext4_inode_table_set(struct super_block *sb,
143 struct ext4_group_desc *bg, ext4_fsblk_t blk)
145 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
146 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
147 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
150 void ext4_free_blks_set(struct super_block *sb,
151 struct ext4_group_desc *bg, __u32 count)
153 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
154 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
155 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
158 void ext4_free_inodes_set(struct super_block *sb,
159 struct ext4_group_desc *bg, __u32 count)
161 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
162 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
163 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
166 void ext4_used_dirs_set(struct super_block *sb,
167 struct ext4_group_desc *bg, __u32 count)
169 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
170 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
171 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
174 void ext4_itable_unused_set(struct super_block *sb,
175 struct ext4_group_desc *bg, __u32 count)
177 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
178 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
179 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
183 * Wrappers for jbd2_journal_start/end.
185 * The only special thing we need to do here is to make sure that all
186 * journal_end calls result in the superblock being marked dirty, so
187 * that sync() will call the filesystem's write_super callback if
190 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
194 if (sb->s_flags & MS_RDONLY)
195 return ERR_PTR(-EROFS);
197 /* Special case here: if the journal has aborted behind our
198 * backs (eg. EIO in the commit thread), then we still need to
199 * take the FS itself readonly cleanly. */
200 journal = EXT4_SB(sb)->s_journal;
202 if (is_journal_aborted(journal)) {
203 ext4_abort(sb, __func__,
204 "Detected aborted journal");
205 return ERR_PTR(-EROFS);
207 return jbd2_journal_start(journal, nblocks);
210 * We're not journaling, return the appropriate indication.
212 current->journal_info = EXT4_NOJOURNAL_HANDLE;
213 return current->journal_info;
217 * The only special thing we need to do here is to make sure that all
218 * jbd2_journal_stop calls result in the superblock being marked dirty, so
219 * that sync() will call the filesystem's write_super callback if
222 int __ext4_journal_stop(const char *where, handle_t *handle)
224 struct super_block *sb;
228 if (!ext4_handle_valid(handle)) {
230 * Do this here since we don't call jbd2_journal_stop() in
233 current->journal_info = NULL;
236 sb = handle->h_transaction->t_journal->j_private;
238 rc = jbd2_journal_stop(handle);
243 __ext4_std_error(sb, where, err);
247 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
248 struct buffer_head *bh, handle_t *handle, int err)
251 const char *errstr = ext4_decode_error(NULL, err, nbuf);
253 BUG_ON(!ext4_handle_valid(handle));
256 BUFFER_TRACE(bh, "abort");
261 if (is_handle_aborted(handle))
264 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
265 caller, errstr, err_fn);
267 jbd2_journal_abort_handle(handle);
270 /* Deal with the reporting of failure conditions on a filesystem such as
271 * inconsistencies detected or read IO failures.
273 * On ext2, we can store the error state of the filesystem in the
274 * superblock. That is not possible on ext4, because we may have other
275 * write ordering constraints on the superblock which prevent us from
276 * writing it out straight away; and given that the journal is about to
277 * be aborted, we can't rely on the current, or future, transactions to
278 * write out the superblock safely.
280 * We'll just use the jbd2_journal_abort() error code to record an error in
281 * the journal instead. On recovery, the journal will compain about
282 * that error until we've noted it down and cleared it.
285 static void ext4_handle_error(struct super_block *sb)
287 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
289 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
290 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
292 if (sb->s_flags & MS_RDONLY)
295 if (!test_opt(sb, ERRORS_CONT)) {
296 journal_t *journal = EXT4_SB(sb)->s_journal;
298 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
300 jbd2_journal_abort(journal, -EIO);
302 if (test_opt(sb, ERRORS_RO)) {
303 printk(KERN_CRIT "Remounting filesystem read-only\n");
304 sb->s_flags |= MS_RDONLY;
306 ext4_commit_super(sb, es, 1);
307 if (test_opt(sb, ERRORS_PANIC))
308 panic("EXT4-fs (device %s): panic forced after error\n",
312 void ext4_error(struct super_block *sb, const char *function,
313 const char *fmt, ...)
318 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
323 ext4_handle_error(sb);
326 static const char *ext4_decode_error(struct super_block *sb, int errno,
333 errstr = "IO failure";
336 errstr = "Out of memory";
339 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
340 errstr = "Journal has aborted";
342 errstr = "Readonly filesystem";
345 /* If the caller passed in an extra buffer for unknown
346 * errors, textualise them now. Else we just return
349 /* Check for truncated error codes... */
350 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
359 /* __ext4_std_error decodes expected errors from journaling functions
360 * automatically and invokes the appropriate error response. */
362 void __ext4_std_error(struct super_block *sb, const char *function, int errno)
367 /* Special case: if the error is EROFS, and we're not already
368 * inside a transaction, then there's really no point in logging
370 if (errno == -EROFS && journal_current_handle() == NULL &&
371 (sb->s_flags & MS_RDONLY))
374 errstr = ext4_decode_error(sb, errno, nbuf);
375 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
376 sb->s_id, function, errstr);
378 ext4_handle_error(sb);
382 * ext4_abort is a much stronger failure handler than ext4_error. The
383 * abort function may be used to deal with unrecoverable failures such
384 * as journal IO errors or ENOMEM at a critical moment in log management.
386 * We unconditionally force the filesystem into an ABORT|READONLY state,
387 * unless the error response on the fs has been set to panic in which
388 * case we take the easy way out and panic immediately.
391 void ext4_abort(struct super_block *sb, const char *function,
392 const char *fmt, ...)
396 printk(KERN_CRIT "ext4_abort called.\n");
399 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
404 if (test_opt(sb, ERRORS_PANIC))
405 panic("EXT4-fs panic from previous error\n");
407 if (sb->s_flags & MS_RDONLY)
410 printk(KERN_CRIT "Remounting filesystem read-only\n");
411 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
412 sb->s_flags |= MS_RDONLY;
413 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
414 if (EXT4_SB(sb)->s_journal)
415 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
418 void ext4_warning(struct super_block *sb, const char *function,
419 const char *fmt, ...)
424 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
431 void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
432 const char *function, const char *fmt, ...)
437 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
440 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
445 if (test_opt(sb, ERRORS_CONT)) {
446 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
447 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
448 ext4_commit_super(sb, es, 0);
451 ext4_unlock_group(sb, grp);
452 ext4_handle_error(sb);
454 * We only get here in the ERRORS_RO case; relocking the group
455 * may be dangerous, but nothing bad will happen since the
456 * filesystem will have already been marked read/only and the
457 * journal has been aborted. We return 1 as a hint to callers
458 * who might what to use the return value from
459 * ext4_grp_locked_error() to distinguish beween the
460 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
461 * aggressively from the ext4 function in question, with a
462 * more appropriate error code.
464 ext4_lock_group(sb, grp);
469 void ext4_update_dynamic_rev(struct super_block *sb)
471 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
473 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
476 ext4_warning(sb, __func__,
477 "updating to rev %d because of new feature flag, "
478 "running e2fsck is recommended",
481 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
482 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
483 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
484 /* leave es->s_feature_*compat flags alone */
485 /* es->s_uuid will be set by e2fsck if empty */
488 * The rest of the superblock fields should be zero, and if not it
489 * means they are likely already in use, so leave them alone. We
490 * can leave it up to e2fsck to clean up any inconsistencies there.
495 * Open the external journal device
497 static struct block_device *ext4_blkdev_get(dev_t dev)
499 struct block_device *bdev;
500 char b[BDEVNAME_SIZE];
502 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
508 printk(KERN_ERR "EXT4-fs: failed to open journal device %s: %ld\n",
509 __bdevname(dev, b), PTR_ERR(bdev));
514 * Release the journal device
516 static int ext4_blkdev_put(struct block_device *bdev)
519 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
522 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
524 struct block_device *bdev;
527 bdev = sbi->journal_bdev;
529 ret = ext4_blkdev_put(bdev);
530 sbi->journal_bdev = NULL;
535 static inline struct inode *orphan_list_entry(struct list_head *l)
537 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
540 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
544 printk(KERN_ERR "sb orphan head is %d\n",
545 le32_to_cpu(sbi->s_es->s_last_orphan));
547 printk(KERN_ERR "sb_info orphan list:\n");
548 list_for_each(l, &sbi->s_orphan) {
549 struct inode *inode = orphan_list_entry(l);
551 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
552 inode->i_sb->s_id, inode->i_ino, inode,
553 inode->i_mode, inode->i_nlink,
558 static void ext4_put_super(struct super_block *sb)
560 struct ext4_sb_info *sbi = EXT4_SB(sb);
561 struct ext4_super_block *es = sbi->s_es;
565 ext4_ext_release(sb);
566 ext4_xattr_put_super(sb);
567 if (sbi->s_journal) {
568 err = jbd2_journal_destroy(sbi->s_journal);
569 sbi->s_journal = NULL;
571 ext4_abort(sb, __func__,
572 "Couldn't clean up the journal");
574 if (!(sb->s_flags & MS_RDONLY)) {
575 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
576 es->s_state = cpu_to_le16(sbi->s_mount_state);
577 ext4_commit_super(sb, es, 1);
580 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
581 remove_proc_entry(sb->s_id, ext4_proc_root);
584 for (i = 0; i < sbi->s_gdb_count; i++)
585 brelse(sbi->s_group_desc[i]);
586 kfree(sbi->s_group_desc);
587 kfree(sbi->s_flex_groups);
588 percpu_counter_destroy(&sbi->s_freeblocks_counter);
589 percpu_counter_destroy(&sbi->s_freeinodes_counter);
590 percpu_counter_destroy(&sbi->s_dirs_counter);
591 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
594 for (i = 0; i < MAXQUOTAS; i++)
595 kfree(sbi->s_qf_names[i]);
598 /* Debugging code just in case the in-memory inode orphan list
599 * isn't empty. The on-disk one can be non-empty if we've
600 * detected an error and taken the fs readonly, but the
601 * in-memory list had better be clean by this point. */
602 if (!list_empty(&sbi->s_orphan))
603 dump_orphan_list(sb, sbi);
604 J_ASSERT(list_empty(&sbi->s_orphan));
606 invalidate_bdev(sb->s_bdev);
607 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
609 * Invalidate the journal device's buffers. We don't want them
610 * floating about in memory - the physical journal device may
611 * hotswapped, and it breaks the `ro-after' testing code.
613 sync_blockdev(sbi->journal_bdev);
614 invalidate_bdev(sbi->journal_bdev);
615 ext4_blkdev_remove(sbi);
617 sb->s_fs_info = NULL;
618 kfree(sbi->s_blockgroup_lock);
623 static struct kmem_cache *ext4_inode_cachep;
626 * Called inside transaction, so use GFP_NOFS
628 static struct inode *ext4_alloc_inode(struct super_block *sb)
630 struct ext4_inode_info *ei;
632 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
635 #ifdef CONFIG_EXT4_FS_POSIX_ACL
636 ei->i_acl = EXT4_ACL_NOT_CACHED;
637 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
639 ei->vfs_inode.i_version = 1;
640 ei->vfs_inode.i_data.writeback_index = 0;
641 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
642 INIT_LIST_HEAD(&ei->i_prealloc_list);
643 spin_lock_init(&ei->i_prealloc_lock);
645 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
646 * therefore it can be null here. Don't check it, just initialize
649 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
650 ei->i_reserved_data_blocks = 0;
651 ei->i_reserved_meta_blocks = 0;
652 ei->i_allocated_meta_blocks = 0;
653 ei->i_delalloc_reserved_flag = 0;
654 spin_lock_init(&(ei->i_block_reservation_lock));
655 return &ei->vfs_inode;
658 static void ext4_destroy_inode(struct inode *inode)
660 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
661 printk("EXT4 Inode %p: orphan list check failed!\n",
663 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
664 EXT4_I(inode), sizeof(struct ext4_inode_info),
668 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
671 static void init_once(void *foo)
673 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
675 INIT_LIST_HEAD(&ei->i_orphan);
676 #ifdef CONFIG_EXT4_FS_XATTR
677 init_rwsem(&ei->xattr_sem);
679 init_rwsem(&ei->i_data_sem);
680 inode_init_once(&ei->vfs_inode);
683 static int init_inodecache(void)
685 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
686 sizeof(struct ext4_inode_info),
687 0, (SLAB_RECLAIM_ACCOUNT|
690 if (ext4_inode_cachep == NULL)
695 static void destroy_inodecache(void)
697 kmem_cache_destroy(ext4_inode_cachep);
700 static void ext4_clear_inode(struct inode *inode)
702 #ifdef CONFIG_EXT4_FS_POSIX_ACL
703 if (EXT4_I(inode)->i_acl &&
704 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
705 posix_acl_release(EXT4_I(inode)->i_acl);
706 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
708 if (EXT4_I(inode)->i_default_acl &&
709 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
710 posix_acl_release(EXT4_I(inode)->i_default_acl);
711 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
714 ext4_discard_preallocations(inode);
715 if (EXT4_JOURNAL(inode))
716 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
717 &EXT4_I(inode)->jinode);
720 static inline void ext4_show_quota_options(struct seq_file *seq,
721 struct super_block *sb)
723 #if defined(CONFIG_QUOTA)
724 struct ext4_sb_info *sbi = EXT4_SB(sb);
726 if (sbi->s_jquota_fmt)
727 seq_printf(seq, ",jqfmt=%s",
728 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
730 if (sbi->s_qf_names[USRQUOTA])
731 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
733 if (sbi->s_qf_names[GRPQUOTA])
734 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
736 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
737 seq_puts(seq, ",usrquota");
739 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
740 seq_puts(seq, ",grpquota");
746 * - it's set to a non-default value OR
747 * - if the per-sb default is different from the global default
749 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
752 unsigned long def_mount_opts;
753 struct super_block *sb = vfs->mnt_sb;
754 struct ext4_sb_info *sbi = EXT4_SB(sb);
755 struct ext4_super_block *es = sbi->s_es;
757 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
758 def_errors = le16_to_cpu(es->s_errors);
760 if (sbi->s_sb_block != 1)
761 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
762 if (test_opt(sb, MINIX_DF))
763 seq_puts(seq, ",minixdf");
764 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
765 seq_puts(seq, ",grpid");
766 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
767 seq_puts(seq, ",nogrpid");
768 if (sbi->s_resuid != EXT4_DEF_RESUID ||
769 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
770 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
772 if (sbi->s_resgid != EXT4_DEF_RESGID ||
773 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
774 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
776 if (test_opt(sb, ERRORS_RO)) {
777 if (def_errors == EXT4_ERRORS_PANIC ||
778 def_errors == EXT4_ERRORS_CONTINUE) {
779 seq_puts(seq, ",errors=remount-ro");
782 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
783 seq_puts(seq, ",errors=continue");
784 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
785 seq_puts(seq, ",errors=panic");
786 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
787 seq_puts(seq, ",nouid32");
788 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
789 seq_puts(seq, ",debug");
790 if (test_opt(sb, OLDALLOC))
791 seq_puts(seq, ",oldalloc");
792 #ifdef CONFIG_EXT4_FS_XATTR
793 if (test_opt(sb, XATTR_USER) &&
794 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
795 seq_puts(seq, ",user_xattr");
796 if (!test_opt(sb, XATTR_USER) &&
797 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
798 seq_puts(seq, ",nouser_xattr");
801 #ifdef CONFIG_EXT4_FS_POSIX_ACL
802 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
803 seq_puts(seq, ",acl");
804 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
805 seq_puts(seq, ",noacl");
807 if (!test_opt(sb, RESERVATION))
808 seq_puts(seq, ",noreservation");
809 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
810 seq_printf(seq, ",commit=%u",
811 (unsigned) (sbi->s_commit_interval / HZ));
813 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
814 seq_printf(seq, ",min_batch_time=%u",
815 (unsigned) sbi->s_min_batch_time);
817 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
818 seq_printf(seq, ",max_batch_time=%u",
819 (unsigned) sbi->s_min_batch_time);
823 * We're changing the default of barrier mount option, so
824 * let's always display its mount state so it's clear what its
827 seq_puts(seq, ",barrier=");
828 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
829 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
830 seq_puts(seq, ",journal_async_commit");
831 if (test_opt(sb, NOBH))
832 seq_puts(seq, ",nobh");
833 if (test_opt(sb, I_VERSION))
834 seq_puts(seq, ",i_version");
835 if (!test_opt(sb, DELALLOC))
836 seq_puts(seq, ",nodelalloc");
840 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
842 * journal mode get enabled in different ways
843 * So just print the value even if we didn't specify it
845 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
846 seq_puts(seq, ",data=journal");
847 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
848 seq_puts(seq, ",data=ordered");
849 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
850 seq_puts(seq, ",data=writeback");
852 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
853 seq_printf(seq, ",inode_readahead_blks=%u",
854 sbi->s_inode_readahead_blks);
856 if (test_opt(sb, DATA_ERR_ABORT))
857 seq_puts(seq, ",data_err=abort");
859 ext4_show_quota_options(seq, sb);
864 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
865 u64 ino, u32 generation)
869 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
870 return ERR_PTR(-ESTALE);
871 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
872 return ERR_PTR(-ESTALE);
874 /* iget isn't really right if the inode is currently unallocated!!
876 * ext4_read_inode will return a bad_inode if the inode had been
877 * deleted, so we should be safe.
879 * Currently we don't know the generation for parent directory, so
880 * a generation of 0 means "accept any"
882 inode = ext4_iget(sb, ino);
884 return ERR_CAST(inode);
885 if (generation && inode->i_generation != generation) {
887 return ERR_PTR(-ESTALE);
893 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
894 int fh_len, int fh_type)
896 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
900 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
901 int fh_len, int fh_type)
903 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
908 * Try to release metadata pages (indirect blocks, directories) which are
909 * mapped via the block device. Since these pages could have journal heads
910 * which would prevent try_to_free_buffers() from freeing them, we must use
911 * jbd2 layer's try_to_free_buffers() function to release them.
913 static int bdev_try_to_free_page(struct super_block *sb, struct page *page, gfp_t wait)
915 journal_t *journal = EXT4_SB(sb)->s_journal;
917 WARN_ON(PageChecked(page));
918 if (!page_has_buffers(page))
921 return jbd2_journal_try_to_free_buffers(journal, page,
923 return try_to_free_buffers(page);
927 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
928 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
930 static int ext4_write_dquot(struct dquot *dquot);
931 static int ext4_acquire_dquot(struct dquot *dquot);
932 static int ext4_release_dquot(struct dquot *dquot);
933 static int ext4_mark_dquot_dirty(struct dquot *dquot);
934 static int ext4_write_info(struct super_block *sb, int type);
935 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
936 char *path, int remount);
937 static int ext4_quota_on_mount(struct super_block *sb, int type);
938 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
939 size_t len, loff_t off);
940 static ssize_t ext4_quota_write(struct super_block *sb, int type,
941 const char *data, size_t len, loff_t off);
943 static struct dquot_operations ext4_quota_operations = {
944 .initialize = dquot_initialize,
946 .alloc_space = dquot_alloc_space,
947 .reserve_space = dquot_reserve_space,
948 .claim_space = dquot_claim_space,
949 .release_rsv = dquot_release_reserved_space,
950 .get_reserved_space = ext4_get_reserved_space,
951 .alloc_inode = dquot_alloc_inode,
952 .free_space = dquot_free_space,
953 .free_inode = dquot_free_inode,
954 .transfer = dquot_transfer,
955 .write_dquot = ext4_write_dquot,
956 .acquire_dquot = ext4_acquire_dquot,
957 .release_dquot = ext4_release_dquot,
958 .mark_dirty = ext4_mark_dquot_dirty,
959 .write_info = ext4_write_info,
960 .alloc_dquot = dquot_alloc,
961 .destroy_dquot = dquot_destroy,
964 static struct quotactl_ops ext4_qctl_operations = {
965 .quota_on = ext4_quota_on,
966 .quota_off = vfs_quota_off,
967 .quota_sync = vfs_quota_sync,
968 .get_info = vfs_get_dqinfo,
969 .set_info = vfs_set_dqinfo,
970 .get_dqblk = vfs_get_dqblk,
971 .set_dqblk = vfs_set_dqblk
975 static const struct super_operations ext4_sops = {
976 .alloc_inode = ext4_alloc_inode,
977 .destroy_inode = ext4_destroy_inode,
978 .write_inode = ext4_write_inode,
979 .dirty_inode = ext4_dirty_inode,
980 .delete_inode = ext4_delete_inode,
981 .put_super = ext4_put_super,
982 .write_super = ext4_write_super,
983 .sync_fs = ext4_sync_fs,
984 .freeze_fs = ext4_freeze,
985 .unfreeze_fs = ext4_unfreeze,
986 .statfs = ext4_statfs,
987 .remount_fs = ext4_remount,
988 .clear_inode = ext4_clear_inode,
989 .show_options = ext4_show_options,
991 .quota_read = ext4_quota_read,
992 .quota_write = ext4_quota_write,
994 .bdev_try_to_free_page = bdev_try_to_free_page,
997 static const struct export_operations ext4_export_ops = {
998 .fh_to_dentry = ext4_fh_to_dentry,
999 .fh_to_parent = ext4_fh_to_parent,
1000 .get_parent = ext4_get_parent,
1004 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1005 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1006 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1007 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1008 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
1009 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1010 Opt_journal_update, Opt_journal_dev,
1011 Opt_journal_checksum, Opt_journal_async_commit,
1012 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1013 Opt_data_err_abort, Opt_data_err_ignore,
1014 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1015 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
1016 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
1017 Opt_grpquota, Opt_i_version,
1018 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
1019 Opt_inode_readahead_blks, Opt_journal_ioprio
1022 static const match_table_t tokens = {
1023 {Opt_bsd_df, "bsddf"},
1024 {Opt_minix_df, "minixdf"},
1025 {Opt_grpid, "grpid"},
1026 {Opt_grpid, "bsdgroups"},
1027 {Opt_nogrpid, "nogrpid"},
1028 {Opt_nogrpid, "sysvgroups"},
1029 {Opt_resgid, "resgid=%u"},
1030 {Opt_resuid, "resuid=%u"},
1032 {Opt_err_cont, "errors=continue"},
1033 {Opt_err_panic, "errors=panic"},
1034 {Opt_err_ro, "errors=remount-ro"},
1035 {Opt_nouid32, "nouid32"},
1036 {Opt_debug, "debug"},
1037 {Opt_oldalloc, "oldalloc"},
1038 {Opt_orlov, "orlov"},
1039 {Opt_user_xattr, "user_xattr"},
1040 {Opt_nouser_xattr, "nouser_xattr"},
1042 {Opt_noacl, "noacl"},
1043 {Opt_reservation, "reservation"},
1044 {Opt_noreservation, "noreservation"},
1045 {Opt_noload, "noload"},
1048 {Opt_commit, "commit=%u"},
1049 {Opt_min_batch_time, "min_batch_time=%u"},
1050 {Opt_max_batch_time, "max_batch_time=%u"},
1051 {Opt_journal_update, "journal=update"},
1052 {Opt_journal_dev, "journal_dev=%u"},
1053 {Opt_journal_checksum, "journal_checksum"},
1054 {Opt_journal_async_commit, "journal_async_commit"},
1055 {Opt_abort, "abort"},
1056 {Opt_data_journal, "data=journal"},
1057 {Opt_data_ordered, "data=ordered"},
1058 {Opt_data_writeback, "data=writeback"},
1059 {Opt_data_err_abort, "data_err=abort"},
1060 {Opt_data_err_ignore, "data_err=ignore"},
1061 {Opt_offusrjquota, "usrjquota="},
1062 {Opt_usrjquota, "usrjquota=%s"},
1063 {Opt_offgrpjquota, "grpjquota="},
1064 {Opt_grpjquota, "grpjquota=%s"},
1065 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1066 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1067 {Opt_grpquota, "grpquota"},
1068 {Opt_noquota, "noquota"},
1069 {Opt_quota, "quota"},
1070 {Opt_usrquota, "usrquota"},
1071 {Opt_barrier, "barrier=%u"},
1072 {Opt_i_version, "i_version"},
1073 {Opt_stripe, "stripe=%u"},
1074 {Opt_resize, "resize"},
1075 {Opt_delalloc, "delalloc"},
1076 {Opt_nodelalloc, "nodelalloc"},
1077 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1078 {Opt_journal_ioprio, "journal_ioprio=%u"},
1082 static ext4_fsblk_t get_sb_block(void **data)
1084 ext4_fsblk_t sb_block;
1085 char *options = (char *) *data;
1087 if (!options || strncmp(options, "sb=", 3) != 0)
1088 return 1; /* Default location */
1090 /*todo: use simple_strtoll with >32bit ext4 */
1091 sb_block = simple_strtoul(options, &options, 0);
1092 if (*options && *options != ',') {
1093 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1097 if (*options == ',')
1099 *data = (void *) options;
1103 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1105 static int parse_options(char *options, struct super_block *sb,
1106 unsigned long *journal_devnum,
1107 unsigned int *journal_ioprio,
1108 ext4_fsblk_t *n_blocks_count, int is_remount)
1110 struct ext4_sb_info *sbi = EXT4_SB(sb);
1112 substring_t args[MAX_OPT_ARGS];
1123 while ((p = strsep(&options, ",")) != NULL) {
1128 token = match_token(p, tokens, args);
1131 clear_opt(sbi->s_mount_opt, MINIX_DF);
1134 set_opt(sbi->s_mount_opt, MINIX_DF);
1137 set_opt(sbi->s_mount_opt, GRPID);
1140 clear_opt(sbi->s_mount_opt, GRPID);
1143 if (match_int(&args[0], &option))
1145 sbi->s_resuid = option;
1148 if (match_int(&args[0], &option))
1150 sbi->s_resgid = option;
1153 /* handled by get_sb_block() instead of here */
1154 /* *sb_block = match_int(&args[0]); */
1157 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1158 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1159 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1162 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1163 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1164 set_opt(sbi->s_mount_opt, ERRORS_RO);
1167 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1168 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1169 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1172 set_opt(sbi->s_mount_opt, NO_UID32);
1175 set_opt(sbi->s_mount_opt, DEBUG);
1178 set_opt(sbi->s_mount_opt, OLDALLOC);
1181 clear_opt(sbi->s_mount_opt, OLDALLOC);
1183 #ifdef CONFIG_EXT4_FS_XATTR
1184 case Opt_user_xattr:
1185 set_opt(sbi->s_mount_opt, XATTR_USER);
1187 case Opt_nouser_xattr:
1188 clear_opt(sbi->s_mount_opt, XATTR_USER);
1191 case Opt_user_xattr:
1192 case Opt_nouser_xattr:
1193 printk(KERN_ERR "EXT4 (no)user_xattr options "
1197 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1199 set_opt(sbi->s_mount_opt, POSIX_ACL);
1202 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1207 printk(KERN_ERR "EXT4 (no)acl options "
1211 case Opt_reservation:
1212 set_opt(sbi->s_mount_opt, RESERVATION);
1214 case Opt_noreservation:
1215 clear_opt(sbi->s_mount_opt, RESERVATION);
1217 case Opt_journal_update:
1219 /* Eventually we will want to be able to create
1220 a journal file here. For now, only allow the
1221 user to specify an existing inode to be the
1224 printk(KERN_ERR "EXT4-fs: cannot specify "
1225 "journal on remount\n");
1228 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1230 case Opt_journal_dev:
1232 printk(KERN_ERR "EXT4-fs: cannot specify "
1233 "journal on remount\n");
1236 if (match_int(&args[0], &option))
1238 *journal_devnum = option;
1240 case Opt_journal_checksum:
1241 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1243 case Opt_journal_async_commit:
1244 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1245 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1248 set_opt(sbi->s_mount_opt, NOLOAD);
1251 if (match_int(&args[0], &option))
1256 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1257 sbi->s_commit_interval = HZ * option;
1259 case Opt_max_batch_time:
1260 if (match_int(&args[0], &option))
1265 option = EXT4_DEF_MAX_BATCH_TIME;
1266 sbi->s_max_batch_time = option;
1268 case Opt_min_batch_time:
1269 if (match_int(&args[0], &option))
1273 sbi->s_min_batch_time = option;
1275 case Opt_data_journal:
1276 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1278 case Opt_data_ordered:
1279 data_opt = EXT4_MOUNT_ORDERED_DATA;
1281 case Opt_data_writeback:
1282 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1285 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1288 "EXT4-fs: cannot change data "
1289 "mode on remount\n");
1293 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1294 sbi->s_mount_opt |= data_opt;
1297 case Opt_data_err_abort:
1298 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1300 case Opt_data_err_ignore:
1301 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1310 if (sb_any_quota_loaded(sb) &&
1311 !sbi->s_qf_names[qtype]) {
1313 "EXT4-fs: Cannot change journaled "
1314 "quota options when quota turned on.\n");
1317 qname = match_strdup(&args[0]);
1320 "EXT4-fs: not enough memory for "
1321 "storing quotafile name.\n");
1324 if (sbi->s_qf_names[qtype] &&
1325 strcmp(sbi->s_qf_names[qtype], qname)) {
1327 "EXT4-fs: %s quota file already "
1328 "specified.\n", QTYPE2NAME(qtype));
1332 sbi->s_qf_names[qtype] = qname;
1333 if (strchr(sbi->s_qf_names[qtype], '/')) {
1335 "EXT4-fs: quotafile must be on "
1336 "filesystem root.\n");
1337 kfree(sbi->s_qf_names[qtype]);
1338 sbi->s_qf_names[qtype] = NULL;
1341 set_opt(sbi->s_mount_opt, QUOTA);
1343 case Opt_offusrjquota:
1346 case Opt_offgrpjquota:
1349 if (sb_any_quota_loaded(sb) &&
1350 sbi->s_qf_names[qtype]) {
1351 printk(KERN_ERR "EXT4-fs: Cannot change "
1352 "journaled quota options when "
1353 "quota turned on.\n");
1357 * The space will be released later when all options
1358 * are confirmed to be correct
1360 sbi->s_qf_names[qtype] = NULL;
1362 case Opt_jqfmt_vfsold:
1363 qfmt = QFMT_VFS_OLD;
1365 case Opt_jqfmt_vfsv0:
1368 if (sb_any_quota_loaded(sb) &&
1369 sbi->s_jquota_fmt != qfmt) {
1370 printk(KERN_ERR "EXT4-fs: Cannot change "
1371 "journaled quota options when "
1372 "quota turned on.\n");
1375 sbi->s_jquota_fmt = qfmt;
1379 set_opt(sbi->s_mount_opt, QUOTA);
1380 set_opt(sbi->s_mount_opt, USRQUOTA);
1383 set_opt(sbi->s_mount_opt, QUOTA);
1384 set_opt(sbi->s_mount_opt, GRPQUOTA);
1387 if (sb_any_quota_loaded(sb)) {
1388 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1389 "options when quota turned on.\n");
1392 clear_opt(sbi->s_mount_opt, QUOTA);
1393 clear_opt(sbi->s_mount_opt, USRQUOTA);
1394 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1401 "EXT4-fs: quota options not supported.\n");
1405 case Opt_offusrjquota:
1406 case Opt_offgrpjquota:
1407 case Opt_jqfmt_vfsold:
1408 case Opt_jqfmt_vfsv0:
1410 "EXT4-fs: journaled quota options not "
1417 set_opt(sbi->s_mount_opt, ABORT);
1420 if (match_int(&args[0], &option))
1423 set_opt(sbi->s_mount_opt, BARRIER);
1425 clear_opt(sbi->s_mount_opt, BARRIER);
1431 printk("EXT4-fs: resize option only available "
1435 if (match_int(&args[0], &option) != 0)
1437 *n_blocks_count = option;
1440 set_opt(sbi->s_mount_opt, NOBH);
1443 clear_opt(sbi->s_mount_opt, NOBH);
1446 set_opt(sbi->s_mount_opt, I_VERSION);
1447 sb->s_flags |= MS_I_VERSION;
1449 case Opt_nodelalloc:
1450 clear_opt(sbi->s_mount_opt, DELALLOC);
1453 if (match_int(&args[0], &option))
1457 sbi->s_stripe = option;
1460 set_opt(sbi->s_mount_opt, DELALLOC);
1462 case Opt_inode_readahead_blks:
1463 if (match_int(&args[0], &option))
1465 if (option < 0 || option > (1 << 30))
1467 sbi->s_inode_readahead_blks = option;
1469 case Opt_journal_ioprio:
1470 if (match_int(&args[0], &option))
1472 if (option < 0 || option > 7)
1474 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1479 "EXT4-fs: Unrecognized mount option \"%s\" "
1480 "or missing value\n", p);
1485 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1486 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1487 sbi->s_qf_names[USRQUOTA])
1488 clear_opt(sbi->s_mount_opt, USRQUOTA);
1490 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1491 sbi->s_qf_names[GRPQUOTA])
1492 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1494 if ((sbi->s_qf_names[USRQUOTA] &&
1495 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1496 (sbi->s_qf_names[GRPQUOTA] &&
1497 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1498 printk(KERN_ERR "EXT4-fs: old and new quota "
1499 "format mixing.\n");
1503 if (!sbi->s_jquota_fmt) {
1504 printk(KERN_ERR "EXT4-fs: journaled quota format "
1505 "not specified.\n");
1509 if (sbi->s_jquota_fmt) {
1510 printk(KERN_ERR "EXT4-fs: journaled quota format "
1511 "specified with no journaling "
1520 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1523 struct ext4_sb_info *sbi = EXT4_SB(sb);
1526 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1527 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1528 "forcing read-only mode\n");
1533 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1534 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1535 "running e2fsck is recommended\n");
1536 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1538 "EXT4-fs warning: mounting fs with errors, "
1539 "running e2fsck is recommended\n");
1540 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1541 le16_to_cpu(es->s_mnt_count) >=
1542 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1544 "EXT4-fs warning: maximal mount count reached, "
1545 "running e2fsck is recommended\n");
1546 else if (le32_to_cpu(es->s_checkinterval) &&
1547 (le32_to_cpu(es->s_lastcheck) +
1548 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1550 "EXT4-fs warning: checktime reached, "
1551 "running e2fsck is recommended\n");
1552 if (!sbi->s_journal)
1553 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1554 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1555 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1556 le16_add_cpu(&es->s_mnt_count, 1);
1557 es->s_mtime = cpu_to_le32(get_seconds());
1558 ext4_update_dynamic_rev(sb);
1560 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1562 ext4_commit_super(sb, es, 1);
1563 if (test_opt(sb, DEBUG))
1564 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1565 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1567 sbi->s_groups_count,
1568 EXT4_BLOCKS_PER_GROUP(sb),
1569 EXT4_INODES_PER_GROUP(sb),
1572 if (EXT4_SB(sb)->s_journal) {
1573 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
1574 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1575 "external", EXT4_SB(sb)->s_journal->j_devname);
1577 printk(KERN_INFO "EXT4 FS on %s, no journal\n", sb->s_id);
1582 static int ext4_fill_flex_info(struct super_block *sb)
1584 struct ext4_sb_info *sbi = EXT4_SB(sb);
1585 struct ext4_group_desc *gdp = NULL;
1586 struct buffer_head *bh;
1587 ext4_group_t flex_group_count;
1588 ext4_group_t flex_group;
1589 int groups_per_flex = 0;
1592 if (!sbi->s_es->s_log_groups_per_flex) {
1593 sbi->s_log_groups_per_flex = 0;
1597 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1598 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1600 /* We allocate both existing and potentially added groups */
1601 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1602 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1603 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1604 sbi->s_flex_groups = kzalloc(flex_group_count *
1605 sizeof(struct flex_groups), GFP_KERNEL);
1606 if (sbi->s_flex_groups == NULL) {
1607 printk(KERN_ERR "EXT4-fs: not enough memory for "
1608 "%u flex groups\n", flex_group_count);
1612 for (i = 0; i < sbi->s_groups_count; i++) {
1613 gdp = ext4_get_group_desc(sb, i, &bh);
1615 flex_group = ext4_flex_group(sbi, i);
1616 sbi->s_flex_groups[flex_group].free_inodes +=
1617 ext4_free_inodes_count(sb, gdp);
1618 sbi->s_flex_groups[flex_group].free_blocks +=
1619 ext4_free_blks_count(sb, gdp);
1627 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1628 struct ext4_group_desc *gdp)
1632 if (sbi->s_es->s_feature_ro_compat &
1633 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1634 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1635 __le32 le_group = cpu_to_le32(block_group);
1637 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1638 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1639 crc = crc16(crc, (__u8 *)gdp, offset);
1640 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1641 /* for checksum of struct ext4_group_desc do the rest...*/
1642 if ((sbi->s_es->s_feature_incompat &
1643 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1644 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1645 crc = crc16(crc, (__u8 *)gdp + offset,
1646 le16_to_cpu(sbi->s_es->s_desc_size) -
1650 return cpu_to_le16(crc);
1653 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1654 struct ext4_group_desc *gdp)
1656 if ((sbi->s_es->s_feature_ro_compat &
1657 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1658 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1664 /* Called at mount-time, super-block is locked */
1665 static int ext4_check_descriptors(struct super_block *sb)
1667 struct ext4_sb_info *sbi = EXT4_SB(sb);
1668 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1669 ext4_fsblk_t last_block;
1670 ext4_fsblk_t block_bitmap;
1671 ext4_fsblk_t inode_bitmap;
1672 ext4_fsblk_t inode_table;
1673 int flexbg_flag = 0;
1676 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1679 ext4_debug("Checking group descriptors");
1681 for (i = 0; i < sbi->s_groups_count; i++) {
1682 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1684 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1685 last_block = ext4_blocks_count(sbi->s_es) - 1;
1687 last_block = first_block +
1688 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1690 block_bitmap = ext4_block_bitmap(sb, gdp);
1691 if (block_bitmap < first_block || block_bitmap > last_block) {
1692 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1693 "Block bitmap for group %u not in group "
1694 "(block %llu)!\n", i, block_bitmap);
1697 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1698 if (inode_bitmap < first_block || inode_bitmap > last_block) {
1699 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1700 "Inode bitmap for group %u not in group "
1701 "(block %llu)!\n", i, inode_bitmap);
1704 inode_table = ext4_inode_table(sb, gdp);
1705 if (inode_table < first_block ||
1706 inode_table + sbi->s_itb_per_group - 1 > last_block) {
1707 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1708 "Inode table for group %u not in group "
1709 "(block %llu)!\n", i, inode_table);
1712 spin_lock(sb_bgl_lock(sbi, i));
1713 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1714 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1715 "Checksum for group %u failed (%u!=%u)\n",
1716 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1717 gdp)), le16_to_cpu(gdp->bg_checksum));
1718 if (!(sb->s_flags & MS_RDONLY)) {
1719 spin_unlock(sb_bgl_lock(sbi, i));
1723 spin_unlock(sb_bgl_lock(sbi, i));
1725 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1728 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1729 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
1733 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1734 * the superblock) which were deleted from all directories, but held open by
1735 * a process at the time of a crash. We walk the list and try to delete these
1736 * inodes at recovery time (only with a read-write filesystem).
1738 * In order to keep the orphan inode chain consistent during traversal (in
1739 * case of crash during recovery), we link each inode into the superblock
1740 * orphan list_head and handle it the same way as an inode deletion during
1741 * normal operation (which journals the operations for us).
1743 * We only do an iget() and an iput() on each inode, which is very safe if we
1744 * accidentally point at an in-use or already deleted inode. The worst that
1745 * can happen in this case is that we get a "bit already cleared" message from
1746 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1747 * e2fsck was run on this filesystem, and it must have already done the orphan
1748 * inode cleanup for us, so we can safely abort without any further action.
1750 static void ext4_orphan_cleanup(struct super_block *sb,
1751 struct ext4_super_block *es)
1753 unsigned int s_flags = sb->s_flags;
1754 int nr_orphans = 0, nr_truncates = 0;
1758 if (!es->s_last_orphan) {
1759 jbd_debug(4, "no orphan inodes to clean up\n");
1763 if (bdev_read_only(sb->s_bdev)) {
1764 printk(KERN_ERR "EXT4-fs: write access "
1765 "unavailable, skipping orphan cleanup.\n");
1769 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1770 if (es->s_last_orphan)
1771 jbd_debug(1, "Errors on filesystem, "
1772 "clearing orphan list.\n");
1773 es->s_last_orphan = 0;
1774 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1778 if (s_flags & MS_RDONLY) {
1779 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1781 sb->s_flags &= ~MS_RDONLY;
1784 /* Needed for iput() to work correctly and not trash data */
1785 sb->s_flags |= MS_ACTIVE;
1786 /* Turn on quotas so that they are updated correctly */
1787 for (i = 0; i < MAXQUOTAS; i++) {
1788 if (EXT4_SB(sb)->s_qf_names[i]) {
1789 int ret = ext4_quota_on_mount(sb, i);
1792 "EXT4-fs: Cannot turn on journaled "
1793 "quota: error %d\n", ret);
1798 while (es->s_last_orphan) {
1799 struct inode *inode;
1801 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1802 if (IS_ERR(inode)) {
1803 es->s_last_orphan = 0;
1807 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1809 if (inode->i_nlink) {
1811 "%s: truncating inode %lu to %lld bytes\n",
1812 __func__, inode->i_ino, inode->i_size);
1813 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1814 inode->i_ino, inode->i_size);
1815 ext4_truncate(inode);
1819 "%s: deleting unreferenced inode %lu\n",
1820 __func__, inode->i_ino);
1821 jbd_debug(2, "deleting unreferenced inode %lu\n",
1825 iput(inode); /* The delete magic happens here! */
1828 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1831 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1832 sb->s_id, PLURAL(nr_orphans));
1834 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1835 sb->s_id, PLURAL(nr_truncates));
1837 /* Turn quotas off */
1838 for (i = 0; i < MAXQUOTAS; i++) {
1839 if (sb_dqopt(sb)->files[i])
1840 vfs_quota_off(sb, i, 0);
1843 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1846 * Maximal extent format file size.
1847 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1848 * extent format containers, within a sector_t, and within i_blocks
1849 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1850 * so that won't be a limiting factor.
1852 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1854 static loff_t ext4_max_size(int blkbits, int has_huge_files)
1857 loff_t upper_limit = MAX_LFS_FILESIZE;
1859 /* small i_blocks in vfs inode? */
1860 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
1862 * CONFIG_LBD is not enabled implies the inode
1863 * i_block represent total blocks in 512 bytes
1864 * 32 == size of vfs inode i_blocks * 8
1866 upper_limit = (1LL << 32) - 1;
1868 /* total blocks in file system block size */
1869 upper_limit >>= (blkbits - 9);
1870 upper_limit <<= blkbits;
1873 /* 32-bit extent-start container, ee_block */
1878 /* Sanity check against vm- & vfs- imposed limits */
1879 if (res > upper_limit)
1886 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1887 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1888 * We need to be 1 filesystem block less than the 2^48 sector limit.
1890 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
1892 loff_t res = EXT4_NDIR_BLOCKS;
1895 /* This is calculated to be the largest file size for a
1896 * dense, bitmapped file such that the total number of
1897 * sectors in the file, including data and all indirect blocks,
1898 * does not exceed 2^48 -1
1899 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1900 * total number of 512 bytes blocks of the file
1903 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
1905 * !has_huge_files or CONFIG_LBD is not enabled
1906 * implies the inode i_block represent total blocks in
1907 * 512 bytes 32 == size of vfs inode i_blocks * 8
1909 upper_limit = (1LL << 32) - 1;
1911 /* total blocks in file system block size */
1912 upper_limit >>= (bits - 9);
1916 * We use 48 bit ext4_inode i_blocks
1917 * With EXT4_HUGE_FILE_FL set the i_blocks
1918 * represent total number of blocks in
1919 * file system block size
1921 upper_limit = (1LL << 48) - 1;
1925 /* indirect blocks */
1927 /* double indirect blocks */
1928 meta_blocks += 1 + (1LL << (bits-2));
1929 /* tripple indirect blocks */
1930 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1932 upper_limit -= meta_blocks;
1933 upper_limit <<= bits;
1935 res += 1LL << (bits-2);
1936 res += 1LL << (2*(bits-2));
1937 res += 1LL << (3*(bits-2));
1939 if (res > upper_limit)
1942 if (res > MAX_LFS_FILESIZE)
1943 res = MAX_LFS_FILESIZE;
1948 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1949 ext4_fsblk_t logical_sb_block, int nr)
1951 struct ext4_sb_info *sbi = EXT4_SB(sb);
1952 ext4_group_t bg, first_meta_bg;
1955 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1957 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1959 return logical_sb_block + nr + 1;
1960 bg = sbi->s_desc_per_block * nr;
1961 if (ext4_bg_has_super(sb, bg))
1963 return (has_super + ext4_group_first_block_no(sb, bg));
1967 * ext4_get_stripe_size: Get the stripe size.
1968 * @sbi: In memory super block info
1970 * If we have specified it via mount option, then
1971 * use the mount option value. If the value specified at mount time is
1972 * greater than the blocks per group use the super block value.
1973 * If the super block value is greater than blocks per group return 0.
1974 * Allocator needs it be less than blocks per group.
1977 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1979 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1980 unsigned long stripe_width =
1981 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1983 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1984 return sbi->s_stripe;
1986 if (stripe_width <= sbi->s_blocks_per_group)
1987 return stripe_width;
1989 if (stride <= sbi->s_blocks_per_group)
1995 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
1996 __releases(kernel_lock)
1997 __acquires(kernel_lock)
2000 struct buffer_head *bh;
2001 struct ext4_super_block *es = NULL;
2002 struct ext4_sb_info *sbi;
2004 ext4_fsblk_t sb_block = get_sb_block(&data);
2005 ext4_fsblk_t logical_sb_block;
2006 unsigned long offset = 0;
2007 unsigned long journal_devnum = 0;
2008 unsigned long def_mount_opts;
2014 unsigned int db_count;
2016 int needs_recovery, has_huge_files;
2020 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
2022 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2026 sbi->s_blockgroup_lock =
2027 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2028 if (!sbi->s_blockgroup_lock) {
2032 sb->s_fs_info = sbi;
2033 sbi->s_mount_opt = 0;
2034 sbi->s_resuid = EXT4_DEF_RESUID;
2035 sbi->s_resgid = EXT4_DEF_RESGID;
2036 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
2037 sbi->s_sb_block = sb_block;
2038 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2043 /* Cleanup superblock name */
2044 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2047 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
2049 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
2054 * The ext4 superblock will not be buffer aligned for other than 1kB
2055 * block sizes. We need to calculate the offset from buffer start.
2057 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
2058 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2059 offset = do_div(logical_sb_block, blocksize);
2061 logical_sb_block = sb_block;
2064 if (!(bh = sb_bread(sb, logical_sb_block))) {
2065 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
2069 * Note: s_es must be initialized as soon as possible because
2070 * some ext4 macro-instructions depend on its value
2072 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2074 sb->s_magic = le16_to_cpu(es->s_magic);
2075 if (sb->s_magic != EXT4_SUPER_MAGIC)
2077 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
2079 /* Set defaults before we parse the mount options */
2080 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
2081 if (def_mount_opts & EXT4_DEFM_DEBUG)
2082 set_opt(sbi->s_mount_opt, DEBUG);
2083 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
2084 set_opt(sbi->s_mount_opt, GRPID);
2085 if (def_mount_opts & EXT4_DEFM_UID16)
2086 set_opt(sbi->s_mount_opt, NO_UID32);
2087 #ifdef CONFIG_EXT4_FS_XATTR
2088 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
2089 set_opt(sbi->s_mount_opt, XATTR_USER);
2091 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2092 if (def_mount_opts & EXT4_DEFM_ACL)
2093 set_opt(sbi->s_mount_opt, POSIX_ACL);
2095 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2096 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2097 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2098 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2099 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2100 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2102 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
2103 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
2104 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
2105 set_opt(sbi->s_mount_opt, ERRORS_CONT);
2107 set_opt(sbi->s_mount_opt, ERRORS_RO);
2109 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2110 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2111 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2112 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2113 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
2115 set_opt(sbi->s_mount_opt, RESERVATION);
2116 set_opt(sbi->s_mount_opt, BARRIER);
2119 * enable delayed allocation by default
2120 * Use -o nodelalloc to turn it off
2122 set_opt(sbi->s_mount_opt, DELALLOC);
2125 if (!parse_options((char *) data, sb, &journal_devnum,
2126 &journal_ioprio, NULL, 0))
2129 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2130 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2132 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2133 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2134 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2135 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
2137 "EXT4-fs warning: feature flags set on rev 0 fs, "
2138 "running e2fsck is recommended\n");
2141 * Check feature flags regardless of the revision level, since we
2142 * previously didn't change the revision level when setting the flags,
2143 * so there is a chance incompat flags are set on a rev 0 filesystem.
2145 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
2147 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
2148 "unsupported optional features (%x).\n", sb->s_id,
2149 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2150 ~EXT4_FEATURE_INCOMPAT_SUPP));
2153 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
2154 if (!(sb->s_flags & MS_RDONLY) && features) {
2155 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
2156 "unsupported optional features (%x).\n", sb->s_id,
2157 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2158 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2161 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2162 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2163 if (has_huge_files) {
2165 * Large file size enabled file system can only be
2166 * mount if kernel is build with CONFIG_LBD
2168 if (sizeof(root->i_blocks) < sizeof(u64) &&
2169 !(sb->s_flags & MS_RDONLY)) {
2170 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2171 "files cannot be mounted read-write "
2172 "without CONFIG_LBD.\n", sb->s_id);
2176 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2178 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2179 blocksize > EXT4_MAX_BLOCK_SIZE) {
2181 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
2182 blocksize, sb->s_id);
2186 if (sb->s_blocksize != blocksize) {
2188 /* Validate the filesystem blocksize */
2189 if (!sb_set_blocksize(sb, blocksize)) {
2190 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2196 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2197 offset = do_div(logical_sb_block, blocksize);
2198 bh = sb_bread(sb, logical_sb_block);
2201 "EXT4-fs: Can't read superblock on 2nd try.\n");
2204 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
2206 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2208 "EXT4-fs: Magic mismatch, very weird !\n");
2213 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2215 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
2217 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2218 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2219 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2221 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2222 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2223 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2224 (!is_power_of_2(sbi->s_inode_size)) ||
2225 (sbi->s_inode_size > blocksize)) {
2227 "EXT4-fs: unsupported inode size: %d\n",
2231 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2232 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2234 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2235 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2236 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2237 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2238 !is_power_of_2(sbi->s_desc_size)) {
2240 "EXT4-fs: unsupported descriptor size %lu\n",
2245 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2246 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2247 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2248 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2250 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2251 if (sbi->s_inodes_per_block == 0)
2253 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2254 sbi->s_inodes_per_block;
2255 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2257 sbi->s_mount_state = le16_to_cpu(es->s_state);
2258 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2259 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2260 for (i = 0; i < 4; i++)
2261 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2262 sbi->s_def_hash_version = es->s_def_hash_version;
2263 i = le32_to_cpu(es->s_flags);
2264 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2265 sbi->s_hash_unsigned = 3;
2266 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2267 #ifdef __CHAR_UNSIGNED__
2268 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2269 sbi->s_hash_unsigned = 3;
2271 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2276 if (sbi->s_blocks_per_group > blocksize * 8) {
2278 "EXT4-fs: #blocks per group too big: %lu\n",
2279 sbi->s_blocks_per_group);
2282 if (sbi->s_inodes_per_group > blocksize * 8) {
2284 "EXT4-fs: #inodes per group too big: %lu\n",
2285 sbi->s_inodes_per_group);
2289 if (ext4_blocks_count(es) >
2290 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
2291 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
2292 " too large to mount safely\n", sb->s_id);
2293 if (sizeof(sector_t) < 8)
2294 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
2299 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2303 * It makes no sense for the first data block to be beyond the end
2304 * of the filesystem.
2306 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
2307 printk(KERN_WARNING "EXT4-fs: bad geometry: first data"
2308 "block %u is beyond end of filesystem (%llu)\n",
2309 le32_to_cpu(es->s_first_data_block),
2310 ext4_blocks_count(es));
2313 blocks_count = (ext4_blocks_count(es) -
2314 le32_to_cpu(es->s_first_data_block) +
2315 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2316 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2317 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
2318 printk(KERN_WARNING "EXT4-fs: groups count too large: %u "
2319 "(block count %llu, first data block %u, "
2320 "blocks per group %lu)\n", sbi->s_groups_count,
2321 ext4_blocks_count(es),
2322 le32_to_cpu(es->s_first_data_block),
2323 EXT4_BLOCKS_PER_GROUP(sb));
2326 sbi->s_groups_count = blocks_count;
2327 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2328 EXT4_DESC_PER_BLOCK(sb);
2329 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
2331 if (sbi->s_group_desc == NULL) {
2332 printk(KERN_ERR "EXT4-fs: not enough memory\n");
2336 #ifdef CONFIG_PROC_FS
2338 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2341 proc_create_data("inode_readahead_blks", 0644, sbi->s_proc,
2343 &sbi->s_inode_readahead_blks);
2346 bgl_lock_init(sbi->s_blockgroup_lock);
2348 for (i = 0; i < db_count; i++) {
2349 block = descriptor_loc(sb, logical_sb_block, i);
2350 sbi->s_group_desc[i] = sb_bread(sb, block);
2351 if (!sbi->s_group_desc[i]) {
2352 printk(KERN_ERR "EXT4-fs: "
2353 "can't read group descriptor %d\n", i);
2358 if (!ext4_check_descriptors(sb)) {
2359 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
2362 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2363 if (!ext4_fill_flex_info(sb)) {
2365 "EXT4-fs: unable to initialize "
2366 "flex_bg meta info!\n");
2370 sbi->s_gdb_count = db_count;
2371 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2372 spin_lock_init(&sbi->s_next_gen_lock);
2374 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2375 ext4_count_free_blocks(sb));
2377 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2378 ext4_count_free_inodes(sb));
2381 err = percpu_counter_init(&sbi->s_dirs_counter,
2382 ext4_count_dirs(sb));
2385 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2388 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2392 sbi->s_stripe = ext4_get_stripe_size(sbi);
2395 * set up enough so that it can read an inode
2397 sb->s_op = &ext4_sops;
2398 sb->s_export_op = &ext4_export_ops;
2399 sb->s_xattr = ext4_xattr_handlers;
2401 sb->s_qcop = &ext4_qctl_operations;
2402 sb->dq_op = &ext4_quota_operations;
2404 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2408 needs_recovery = (es->s_last_orphan != 0 ||
2409 EXT4_HAS_INCOMPAT_FEATURE(sb,
2410 EXT4_FEATURE_INCOMPAT_RECOVER));
2413 * The first inode we look at is the journal inode. Don't try
2414 * root first: it may be modified in the journal!
2416 if (!test_opt(sb, NOLOAD) &&
2417 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2418 if (ext4_load_journal(sb, es, journal_devnum))
2420 if (!(sb->s_flags & MS_RDONLY) &&
2421 EXT4_SB(sb)->s_journal->j_failed_commit) {
2422 printk(KERN_CRIT "EXT4-fs error (device %s): "
2423 "ext4_fill_super: Journal transaction "
2424 "%u is corrupt\n", sb->s_id,
2425 EXT4_SB(sb)->s_journal->j_failed_commit);
2426 if (test_opt(sb, ERRORS_RO)) {
2428 "Mounting filesystem read-only\n");
2429 sb->s_flags |= MS_RDONLY;
2430 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2431 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2433 if (test_opt(sb, ERRORS_PANIC)) {
2434 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2435 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2436 ext4_commit_super(sb, es, 1);
2440 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2441 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2442 printk(KERN_ERR "EXT4-fs: required journal recovery "
2443 "suppressed and not mounted read-only\n");
2446 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2447 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2448 sbi->s_journal = NULL;
2453 if (ext4_blocks_count(es) > 0xffffffffULL &&
2454 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2455 JBD2_FEATURE_INCOMPAT_64BIT)) {
2456 printk(KERN_ERR "EXT4-fs: Failed to set 64-bit journal feature\n");
2460 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2461 jbd2_journal_set_features(sbi->s_journal,
2462 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2463 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2464 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2465 jbd2_journal_set_features(sbi->s_journal,
2466 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2467 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2468 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2470 jbd2_journal_clear_features(sbi->s_journal,
2471 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2472 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2475 /* We have now updated the journal if required, so we can
2476 * validate the data journaling mode. */
2477 switch (test_opt(sb, DATA_FLAGS)) {
2479 /* No mode set, assume a default based on the journal
2480 * capabilities: ORDERED_DATA if the journal can
2481 * cope, else JOURNAL_DATA
2483 if (jbd2_journal_check_available_features
2484 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2485 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2487 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2490 case EXT4_MOUNT_ORDERED_DATA:
2491 case EXT4_MOUNT_WRITEBACK_DATA:
2492 if (!jbd2_journal_check_available_features
2493 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2494 printk(KERN_ERR "EXT4-fs: Journal does not support "
2495 "requested data journaling mode\n");
2501 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
2505 if (test_opt(sb, NOBH)) {
2506 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2507 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
2508 "its supported only with writeback mode\n");
2509 clear_opt(sbi->s_mount_opt, NOBH);
2513 * The jbd2_journal_load will have done any necessary log recovery,
2514 * so we can safely mount the rest of the filesystem now.
2517 root = ext4_iget(sb, EXT4_ROOT_INO);
2519 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
2520 ret = PTR_ERR(root);
2523 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2525 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
2528 sb->s_root = d_alloc_root(root);
2530 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2536 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
2538 /* determine the minimum size of new large inodes, if present */
2539 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2540 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2541 EXT4_GOOD_OLD_INODE_SIZE;
2542 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2543 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2544 if (sbi->s_want_extra_isize <
2545 le16_to_cpu(es->s_want_extra_isize))
2546 sbi->s_want_extra_isize =
2547 le16_to_cpu(es->s_want_extra_isize);
2548 if (sbi->s_want_extra_isize <
2549 le16_to_cpu(es->s_min_extra_isize))
2550 sbi->s_want_extra_isize =
2551 le16_to_cpu(es->s_min_extra_isize);
2554 /* Check if enough inode space is available */
2555 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2556 sbi->s_inode_size) {
2557 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2558 EXT4_GOOD_OLD_INODE_SIZE;
2559 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2563 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2564 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2565 "requested data journaling mode\n");
2566 clear_opt(sbi->s_mount_opt, DELALLOC);
2567 } else if (test_opt(sb, DELALLOC))
2568 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2571 err = ext4_mb_init(sb, needs_recovery);
2573 printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
2579 * akpm: core read_super() calls in here with the superblock locked.
2580 * That deadlocks, because orphan cleanup needs to lock the superblock
2581 * in numerous places. Here we just pop the lock - it's relatively
2582 * harmless, because we are now ready to accept write_super() requests,
2583 * and aviro says that's the only reason for hanging onto the
2586 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2587 ext4_orphan_cleanup(sb, es);
2588 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2589 if (needs_recovery) {
2590 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
2591 ext4_mark_recovery_complete(sb, es);
2593 if (EXT4_SB(sb)->s_journal) {
2594 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2595 descr = " journalled data mode";
2596 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2597 descr = " ordered data mode";
2599 descr = " writeback data mode";
2601 descr = "out journal";
2603 printk(KERN_INFO "EXT4-fs: mounted filesystem %s with%s\n",
2611 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
2616 printk(KERN_ERR "EXT4-fs (device %s): mount failed\n", sb->s_id);
2617 if (sbi->s_journal) {
2618 jbd2_journal_destroy(sbi->s_journal);
2619 sbi->s_journal = NULL;
2622 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2623 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2624 percpu_counter_destroy(&sbi->s_dirs_counter);
2625 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
2627 for (i = 0; i < db_count; i++)
2628 brelse(sbi->s_group_desc[i]);
2629 kfree(sbi->s_group_desc);
2632 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
2633 remove_proc_entry(sb->s_id, ext4_proc_root);
2636 for (i = 0; i < MAXQUOTAS; i++)
2637 kfree(sbi->s_qf_names[i]);
2639 ext4_blkdev_remove(sbi);
2642 sb->s_fs_info = NULL;
2649 * Setup any per-fs journal parameters now. We'll do this both on
2650 * initial mount, once the journal has been initialised but before we've
2651 * done any recovery; and again on any subsequent remount.
2653 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2655 struct ext4_sb_info *sbi = EXT4_SB(sb);
2657 journal->j_commit_interval = sbi->s_commit_interval;
2658 journal->j_min_batch_time = sbi->s_min_batch_time;
2659 journal->j_max_batch_time = sbi->s_max_batch_time;
2661 spin_lock(&journal->j_state_lock);
2662 if (test_opt(sb, BARRIER))
2663 journal->j_flags |= JBD2_BARRIER;
2665 journal->j_flags &= ~JBD2_BARRIER;
2666 if (test_opt(sb, DATA_ERR_ABORT))
2667 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
2669 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
2670 spin_unlock(&journal->j_state_lock);
2673 static journal_t *ext4_get_journal(struct super_block *sb,
2674 unsigned int journal_inum)
2676 struct inode *journal_inode;
2679 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2681 /* First, test for the existence of a valid inode on disk. Bad
2682 * things happen if we iget() an unused inode, as the subsequent
2683 * iput() will try to delete it. */
2685 journal_inode = ext4_iget(sb, journal_inum);
2686 if (IS_ERR(journal_inode)) {
2687 printk(KERN_ERR "EXT4-fs: no journal found.\n");
2690 if (!journal_inode->i_nlink) {
2691 make_bad_inode(journal_inode);
2692 iput(journal_inode);
2693 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
2697 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
2698 journal_inode, journal_inode->i_size);
2699 if (!S_ISREG(journal_inode->i_mode)) {
2700 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
2701 iput(journal_inode);
2705 journal = jbd2_journal_init_inode(journal_inode);
2707 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
2708 iput(journal_inode);
2711 journal->j_private = sb;
2712 ext4_init_journal_params(sb, journal);
2716 static journal_t *ext4_get_dev_journal(struct super_block *sb,
2719 struct buffer_head *bh;
2723 int hblock, blocksize;
2724 ext4_fsblk_t sb_block;
2725 unsigned long offset;
2726 struct ext4_super_block *es;
2727 struct block_device *bdev;
2729 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2731 bdev = ext4_blkdev_get(j_dev);
2735 if (bd_claim(bdev, sb)) {
2737 "EXT4-fs: failed to claim external journal device.\n");
2738 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2742 blocksize = sb->s_blocksize;
2743 hblock = bdev_hardsect_size(bdev);
2744 if (blocksize < hblock) {
2746 "EXT4-fs: blocksize too small for journal device.\n");
2750 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2751 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2752 set_blocksize(bdev, blocksize);
2753 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2754 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2755 "external journal\n");
2759 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2760 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2761 !(le32_to_cpu(es->s_feature_incompat) &
2762 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2763 printk(KERN_ERR "EXT4-fs: external journal has "
2764 "bad superblock\n");
2769 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2770 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2775 len = ext4_blocks_count(es);
2776 start = sb_block + 1;
2777 brelse(bh); /* we're done with the superblock */
2779 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2780 start, len, blocksize);
2782 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2785 journal->j_private = sb;
2786 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2787 wait_on_buffer(journal->j_sb_buffer);
2788 if (!buffer_uptodate(journal->j_sb_buffer)) {
2789 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2792 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2793 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2794 "user (unsupported) - %d\n",
2795 be32_to_cpu(journal->j_superblock->s_nr_users));
2798 EXT4_SB(sb)->journal_bdev = bdev;
2799 ext4_init_journal_params(sb, journal);
2802 jbd2_journal_destroy(journal);
2804 ext4_blkdev_put(bdev);
2808 static int ext4_load_journal(struct super_block *sb,
2809 struct ext4_super_block *es,
2810 unsigned long journal_devnum)
2813 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2816 int really_read_only;
2818 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2820 if (journal_devnum &&
2821 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2822 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2823 "numbers have changed\n");
2824 journal_dev = new_decode_dev(journal_devnum);
2826 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2828 really_read_only = bdev_read_only(sb->s_bdev);
2831 * Are we loading a blank journal or performing recovery after a
2832 * crash? For recovery, we need to check in advance whether we
2833 * can get read-write access to the device.
2836 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2837 if (sb->s_flags & MS_RDONLY) {
2838 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2839 "required on readonly filesystem.\n");
2840 if (really_read_only) {
2841 printk(KERN_ERR "EXT4-fs: write access "
2842 "unavailable, cannot proceed.\n");
2845 printk(KERN_INFO "EXT4-fs: write access will "
2846 "be enabled during recovery.\n");
2850 if (journal_inum && journal_dev) {
2851 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2852 "and inode journals!\n");
2857 if (!(journal = ext4_get_journal(sb, journal_inum)))
2860 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2864 if (journal->j_flags & JBD2_BARRIER)
2865 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
2867 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
2869 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2870 err = jbd2_journal_update_format(journal);
2872 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2873 jbd2_journal_destroy(journal);
2878 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2879 err = jbd2_journal_wipe(journal, !really_read_only);
2881 err = jbd2_journal_load(journal);
2884 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2885 jbd2_journal_destroy(journal);
2889 EXT4_SB(sb)->s_journal = journal;
2890 ext4_clear_journal_err(sb, es);
2892 if (journal_devnum &&
2893 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2894 es->s_journal_dev = cpu_to_le32(journal_devnum);
2897 /* Make sure we flush the recovery flag to disk. */
2898 ext4_commit_super(sb, es, 1);
2904 static int ext4_commit_super(struct super_block *sb,
2905 struct ext4_super_block *es, int sync)
2907 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2912 if (buffer_write_io_error(sbh)) {
2914 * Oh, dear. A previous attempt to write the
2915 * superblock failed. This could happen because the
2916 * USB device was yanked out. Or it could happen to
2917 * be a transient write error and maybe the block will
2918 * be remapped. Nothing we can do but to retry the
2919 * write and hope for the best.
2921 printk(KERN_ERR "EXT4-fs: previous I/O error to "
2922 "superblock detected for %s.\n", sb->s_id);
2923 clear_buffer_write_io_error(sbh);
2924 set_buffer_uptodate(sbh);
2926 es->s_wtime = cpu_to_le32(get_seconds());
2927 es->s_kbytes_written =
2928 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
2929 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2930 EXT4_SB(sb)->s_sectors_written_start) >> 1));
2931 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
2932 &EXT4_SB(sb)->s_freeblocks_counter));
2933 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
2934 &EXT4_SB(sb)->s_freeinodes_counter));
2936 BUFFER_TRACE(sbh, "marking dirty");
2937 mark_buffer_dirty(sbh);
2939 error = sync_dirty_buffer(sbh);
2943 error = buffer_write_io_error(sbh);
2945 printk(KERN_ERR "EXT4-fs: I/O error while writing "
2946 "superblock for %s.\n", sb->s_id);
2947 clear_buffer_write_io_error(sbh);
2948 set_buffer_uptodate(sbh);
2956 * Have we just finished recovery? If so, and if we are mounting (or
2957 * remounting) the filesystem readonly, then we will end up with a
2958 * consistent fs on disk. Record that fact.
2960 static void ext4_mark_recovery_complete(struct super_block *sb,
2961 struct ext4_super_block *es)
2963 journal_t *journal = EXT4_SB(sb)->s_journal;
2965 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2966 BUG_ON(journal != NULL);
2969 jbd2_journal_lock_updates(journal);
2970 if (jbd2_journal_flush(journal) < 0)
2974 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2975 sb->s_flags & MS_RDONLY) {
2976 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2978 ext4_commit_super(sb, es, 1);
2983 jbd2_journal_unlock_updates(journal);
2987 * If we are mounting (or read-write remounting) a filesystem whose journal
2988 * has recorded an error from a previous lifetime, move that error to the
2989 * main filesystem now.
2991 static void ext4_clear_journal_err(struct super_block *sb,
2992 struct ext4_super_block *es)
2998 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3000 journal = EXT4_SB(sb)->s_journal;
3003 * Now check for any error status which may have been recorded in the
3004 * journal by a prior ext4_error() or ext4_abort()
3007 j_errno = jbd2_journal_errno(journal);
3011 errstr = ext4_decode_error(sb, j_errno, nbuf);
3012 ext4_warning(sb, __func__, "Filesystem error recorded "
3013 "from previous mount: %s", errstr);
3014 ext4_warning(sb, __func__, "Marking fs in need of "
3015 "filesystem check.");
3017 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3018 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
3019 ext4_commit_super(sb, es, 1);
3021 jbd2_journal_clear_err(journal);
3026 * Force the running and committing transactions to commit,
3027 * and wait on the commit.
3029 int ext4_force_commit(struct super_block *sb)
3034 if (sb->s_flags & MS_RDONLY)
3037 journal = EXT4_SB(sb)->s_journal;
3040 ret = ext4_journal_force_commit(journal);
3047 * Ext4 always journals updates to the superblock itself, so we don't
3048 * have to propagate any other updates to the superblock on disk at this
3049 * point. (We can probably nuke this function altogether, and remove
3050 * any mention to sb->s_dirt in all of fs/ext4; eventual cleanup...)
3052 static void ext4_write_super(struct super_block *sb)
3054 if (EXT4_SB(sb)->s_journal) {
3055 if (mutex_trylock(&sb->s_lock) != 0)
3059 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
3063 static int ext4_sync_fs(struct super_block *sb, int wait)
3068 trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
3070 if (EXT4_SB(sb)->s_journal) {
3071 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal,
3074 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal,
3078 ext4_commit_super(sb, EXT4_SB(sb)->s_es, wait);
3084 * LVM calls this function before a (read-only) snapshot is created. This
3085 * gives us a chance to flush the journal completely and mark the fs clean.
3087 static int ext4_freeze(struct super_block *sb)
3093 if (!(sb->s_flags & MS_RDONLY)) {
3094 journal = EXT4_SB(sb)->s_journal;
3097 /* Now we set up the journal barrier. */
3098 jbd2_journal_lock_updates(journal);
3101 * We don't want to clear needs_recovery flag when we
3102 * failed to flush the journal.
3104 error = jbd2_journal_flush(journal);
3109 /* Journal blocked and flushed, clear needs_recovery flag. */
3110 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3111 error = ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
3117 jbd2_journal_unlock_updates(journal);
3122 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3123 * flag here, even though the filesystem is not technically dirty yet.
3125 static int ext4_unfreeze(struct super_block *sb)
3127 if (EXT4_SB(sb)->s_journal && !(sb->s_flags & MS_RDONLY)) {
3129 /* Reser the needs_recovery flag before the fs is unlocked. */
3130 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3131 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
3133 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3138 static int ext4_remount(struct super_block *sb, int *flags, char *data)
3140 struct ext4_super_block *es;
3141 struct ext4_sb_info *sbi = EXT4_SB(sb);
3142 ext4_fsblk_t n_blocks_count = 0;
3143 unsigned long old_sb_flags;
3144 struct ext4_mount_options old_opts;
3146 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3152 /* Store the original options */
3153 old_sb_flags = sb->s_flags;
3154 old_opts.s_mount_opt = sbi->s_mount_opt;
3155 old_opts.s_resuid = sbi->s_resuid;
3156 old_opts.s_resgid = sbi->s_resgid;
3157 old_opts.s_commit_interval = sbi->s_commit_interval;
3158 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3159 old_opts.s_max_batch_time = sbi->s_max_batch_time;
3161 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3162 for (i = 0; i < MAXQUOTAS; i++)
3163 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3165 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3166 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
3169 * Allow the "check" option to be passed as a remount option.
3171 if (!parse_options(data, sb, NULL, &journal_ioprio,
3172 &n_blocks_count, 1)) {
3177 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
3178 ext4_abort(sb, __func__, "Abort forced by user");
3180 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3181 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
3185 if (sbi->s_journal) {
3186 ext4_init_journal_params(sb, sbi->s_journal);
3187 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3190 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
3191 n_blocks_count > ext4_blocks_count(es)) {
3192 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
3197 if (*flags & MS_RDONLY) {
3199 * First of all, the unconditional stuff we have to do
3200 * to disable replay of the journal when we next remount
3202 sb->s_flags |= MS_RDONLY;
3205 * OK, test if we are remounting a valid rw partition
3206 * readonly, and if so set the rdonly flag and then
3207 * mark the partition as valid again.
3209 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3210 (sbi->s_mount_state & EXT4_VALID_FS))
3211 es->s_state = cpu_to_le16(sbi->s_mount_state);
3214 * We have to unlock super so that we can wait for
3217 if (sbi->s_journal) {
3219 ext4_mark_recovery_complete(sb, es);
3224 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3225 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3226 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3227 "remount RDWR because of unsupported "
3228 "optional features (%x).\n", sb->s_id,
3229 (le32_to_cpu(sbi->s_es->s_feature_ro_compat) &
3230 ~EXT4_FEATURE_RO_COMPAT_SUPP));
3236 * Make sure the group descriptor checksums
3237 * are sane. If they aren't, refuse to
3240 for (g = 0; g < sbi->s_groups_count; g++) {
3241 struct ext4_group_desc *gdp =
3242 ext4_get_group_desc(sb, g, NULL);
3244 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3246 "EXT4-fs: ext4_remount: "
3247 "Checksum for group %u failed (%u!=%u)\n",
3248 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3249 le16_to_cpu(gdp->bg_checksum));
3256 * If we have an unprocessed orphan list hanging
3257 * around from a previously readonly bdev mount,
3258 * require a full umount/remount for now.
3260 if (es->s_last_orphan) {
3261 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3262 "remount RDWR because of unprocessed "
3263 "orphan inode list. Please "
3264 "umount/remount instead.\n",
3271 * Mounting a RDONLY partition read-write, so reread
3272 * and store the current valid flag. (It may have
3273 * been changed by e2fsck since we originally mounted
3277 ext4_clear_journal_err(sb, es);
3278 sbi->s_mount_state = le16_to_cpu(es->s_state);
3279 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
3281 if (!ext4_setup_super(sb, es, 0))
3282 sb->s_flags &= ~MS_RDONLY;
3285 if (sbi->s_journal == NULL)
3286 ext4_commit_super(sb, es, 1);
3289 /* Release old quota file names */
3290 for (i = 0; i < MAXQUOTAS; i++)
3291 if (old_opts.s_qf_names[i] &&
3292 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3293 kfree(old_opts.s_qf_names[i]);
3297 sb->s_flags = old_sb_flags;
3298 sbi->s_mount_opt = old_opts.s_mount_opt;
3299 sbi->s_resuid = old_opts.s_resuid;
3300 sbi->s_resgid = old_opts.s_resgid;
3301 sbi->s_commit_interval = old_opts.s_commit_interval;
3302 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3303 sbi->s_max_batch_time = old_opts.s_max_batch_time;
3305 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3306 for (i = 0; i < MAXQUOTAS; i++) {
3307 if (sbi->s_qf_names[i] &&
3308 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3309 kfree(sbi->s_qf_names[i]);
3310 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3316 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
3318 struct super_block *sb = dentry->d_sb;
3319 struct ext4_sb_info *sbi = EXT4_SB(sb);
3320 struct ext4_super_block *es = sbi->s_es;
3323 if (test_opt(sb, MINIX_DF)) {
3324 sbi->s_overhead_last = 0;
3325 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
3326 ext4_group_t ngroups = sbi->s_groups_count, i;
3327 ext4_fsblk_t overhead = 0;
3331 * Compute the overhead (FS structures). This is constant
3332 * for a given filesystem unless the number of block groups
3333 * changes so we cache the previous value until it does.
3337 * All of the blocks before first_data_block are
3340 overhead = le32_to_cpu(es->s_first_data_block);
3343 * Add the overhead attributed to the superblock and
3344 * block group descriptors. If the sparse superblocks
3345 * feature is turned on, then not all groups have this.
3347 for (i = 0; i < ngroups; i++) {
3348 overhead += ext4_bg_has_super(sb, i) +
3349 ext4_bg_num_gdb(sb, i);
3354 * Every block group has an inode bitmap, a block
3355 * bitmap, and an inode table.
3357 overhead += ngroups * (2 + sbi->s_itb_per_group);
3358 sbi->s_overhead_last = overhead;
3360 sbi->s_blocks_last = ext4_blocks_count(es);
3363 buf->f_type = EXT4_SUPER_MAGIC;
3364 buf->f_bsize = sb->s_blocksize;
3365 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
3366 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3367 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
3368 ext4_free_blocks_count_set(es, buf->f_bfree);
3369 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3370 if (buf->f_bfree < ext4_r_blocks_count(es))
3372 buf->f_files = le32_to_cpu(es->s_inodes_count);
3373 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
3374 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
3375 buf->f_namelen = EXT4_NAME_LEN;
3376 fsid = le64_to_cpup((void *)es->s_uuid) ^
3377 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3378 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3379 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
3383 /* Helper function for writing quotas on sync - we need to start transaction before quota file
3384 * is locked for write. Otherwise the are possible deadlocks:
3385 * Process 1 Process 2
3386 * ext4_create() quota_sync()
3387 * jbd2_journal_start() write_dquot()
3388 * vfs_dq_init() down(dqio_mutex)
3389 * down(dqio_mutex) jbd2_journal_start()
3395 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3397 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3400 static int ext4_write_dquot(struct dquot *dquot)
3404 struct inode *inode;
3406 inode = dquot_to_inode(dquot);
3407 handle = ext4_journal_start(inode,
3408 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3410 return PTR_ERR(handle);
3411 ret = dquot_commit(dquot);
3412 err = ext4_journal_stop(handle);
3418 static int ext4_acquire_dquot(struct dquot *dquot)
3423 handle = ext4_journal_start(dquot_to_inode(dquot),
3424 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3426 return PTR_ERR(handle);
3427 ret = dquot_acquire(dquot);
3428 err = ext4_journal_stop(handle);
3434 static int ext4_release_dquot(struct dquot *dquot)
3439 handle = ext4_journal_start(dquot_to_inode(dquot),
3440 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3441 if (IS_ERR(handle)) {
3442 /* Release dquot anyway to avoid endless cycle in dqput() */
3443 dquot_release(dquot);
3444 return PTR_ERR(handle);
3446 ret = dquot_release(dquot);
3447 err = ext4_journal_stop(handle);
3453 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3455 /* Are we journaling quotas? */
3456 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3457 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3458 dquot_mark_dquot_dirty(dquot);
3459 return ext4_write_dquot(dquot);
3461 return dquot_mark_dquot_dirty(dquot);
3465 static int ext4_write_info(struct super_block *sb, int type)
3470 /* Data block + inode block */
3471 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3473 return PTR_ERR(handle);
3474 ret = dquot_commit_info(sb, type);
3475 err = ext4_journal_stop(handle);
3482 * Turn on quotas during mount time - we need to find
3483 * the quota file and such...
3485 static int ext4_quota_on_mount(struct super_block *sb, int type)
3487 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3488 EXT4_SB(sb)->s_jquota_fmt, type);
3492 * Standard function to be called on quota_on
3494 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3495 char *name, int remount)
3500 if (!test_opt(sb, QUOTA))
3502 /* When remounting, no checks are needed and in fact, name is NULL */
3504 return vfs_quota_on(sb, type, format_id, name, remount);
3506 err = kern_path(name, LOOKUP_FOLLOW, &path);
3510 /* Quotafile not on the same filesystem? */
3511 if (path.mnt->mnt_sb != sb) {
3515 /* Journaling quota? */
3516 if (EXT4_SB(sb)->s_qf_names[type]) {
3517 /* Quotafile not in fs root? */
3518 if (path.dentry->d_parent != sb->s_root)
3520 "EXT4-fs: Quota file not on filesystem root. "
3521 "Journaled quota will not work.\n");
3525 * When we journal data on quota file, we have to flush journal to see
3526 * all updates to the file when we bypass pagecache...
3528 if (EXT4_SB(sb)->s_journal &&
3529 ext4_should_journal_data(path.dentry->d_inode)) {
3531 * We don't need to lock updates but journal_flush() could
3532 * otherwise be livelocked...
3534 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3535 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3536 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3543 err = vfs_quota_on_path(sb, type, format_id, &path);
3548 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3549 * acquiring the locks... As quota files are never truncated and quota code
3550 * itself serializes the operations (and noone else should touch the files)
3551 * we don't have to be afraid of races */
3552 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3553 size_t len, loff_t off)
3555 struct inode *inode = sb_dqopt(sb)->files[type];
3556 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3558 int offset = off & (sb->s_blocksize - 1);
3561 struct buffer_head *bh;
3562 loff_t i_size = i_size_read(inode);
3566 if (off+len > i_size)
3569 while (toread > 0) {
3570 tocopy = sb->s_blocksize - offset < toread ?
3571 sb->s_blocksize - offset : toread;
3572 bh = ext4_bread(NULL, inode, blk, 0, &err);
3575 if (!bh) /* A hole? */
3576 memset(data, 0, tocopy);
3578 memcpy(data, bh->b_data+offset, tocopy);
3588 /* Write to quotafile (we know the transaction is already started and has
3589 * enough credits) */
3590 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3591 const char *data, size_t len, loff_t off)
3593 struct inode *inode = sb_dqopt(sb)->files[type];
3594 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3596 int offset = off & (sb->s_blocksize - 1);
3598 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3599 size_t towrite = len;
3600 struct buffer_head *bh;
3601 handle_t *handle = journal_current_handle();
3603 if (EXT4_SB(sb)->s_journal && !handle) {
3604 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
3605 " cancelled because transaction is not started.\n",
3606 (unsigned long long)off, (unsigned long long)len);
3609 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3610 while (towrite > 0) {
3611 tocopy = sb->s_blocksize - offset < towrite ?
3612 sb->s_blocksize - offset : towrite;
3613 bh = ext4_bread(handle, inode, blk, 1, &err);
3616 if (journal_quota) {
3617 err = ext4_journal_get_write_access(handle, bh);
3624 memcpy(bh->b_data+offset, data, tocopy);
3625 flush_dcache_page(bh->b_page);
3628 err = ext4_handle_dirty_metadata(handle, NULL, bh);
3630 /* Always do at least ordered writes for quotas */
3631 err = ext4_jbd2_file_inode(handle, inode);
3632 mark_buffer_dirty(bh);
3643 if (len == towrite) {
3644 mutex_unlock(&inode->i_mutex);
3647 if (inode->i_size < off+len-towrite) {
3648 i_size_write(inode, off+len-towrite);
3649 EXT4_I(inode)->i_disksize = inode->i_size;
3651 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3652 ext4_mark_inode_dirty(handle, inode);
3653 mutex_unlock(&inode->i_mutex);
3654 return len - towrite;
3659 static int ext4_get_sb(struct file_system_type *fs_type,
3660 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3662 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3665 #ifdef CONFIG_PROC_FS
3666 static int ext4_ui_proc_show(struct seq_file *m, void *v)
3668 unsigned int *p = m->private;
3670 seq_printf(m, "%u\n", *p);
3674 static int ext4_ui_proc_open(struct inode *inode, struct file *file)
3676 return single_open(file, ext4_ui_proc_show, PDE(inode)->data);
3679 static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf,
3680 size_t cnt, loff_t *ppos)
3682 unsigned long *p = PDE(file->f_path.dentry->d_inode)->data;
3685 if (cnt >= sizeof(str))
3687 if (copy_from_user(str, buf, cnt))
3690 *p = simple_strtoul(str, NULL, 0);
3694 const struct file_operations ext4_ui_proc_fops = {
3695 .owner = THIS_MODULE,
3696 .open = ext4_ui_proc_open,
3698 .llseek = seq_lseek,
3699 .release = single_release,
3700 .write = ext4_ui_proc_write,
3704 static struct file_system_type ext4_fs_type = {
3705 .owner = THIS_MODULE,
3707 .get_sb = ext4_get_sb,
3708 .kill_sb = kill_block_super,
3709 .fs_flags = FS_REQUIRES_DEV,
3712 #ifdef CONFIG_EXT4DEV_COMPAT
3713 static int ext4dev_get_sb(struct file_system_type *fs_type,
3714 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3716 printk(KERN_WARNING "EXT4-fs: Update your userspace programs "
3717 "to mount using ext4\n");
3718 printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility "
3719 "will go away by 2.6.31\n");
3720 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3723 static struct file_system_type ext4dev_fs_type = {
3724 .owner = THIS_MODULE,
3726 .get_sb = ext4dev_get_sb,
3727 .kill_sb = kill_block_super,
3728 .fs_flags = FS_REQUIRES_DEV,
3730 MODULE_ALIAS("ext4dev");
3733 static int __init init_ext4_fs(void)
3737 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
3738 err = init_ext4_mballoc();
3742 err = init_ext4_xattr();
3745 err = init_inodecache();
3748 err = register_filesystem(&ext4_fs_type);
3751 #ifdef CONFIG_EXT4DEV_COMPAT
3752 err = register_filesystem(&ext4dev_fs_type);
3754 unregister_filesystem(&ext4_fs_type);
3760 destroy_inodecache();
3764 exit_ext4_mballoc();
3768 static void __exit exit_ext4_fs(void)
3770 unregister_filesystem(&ext4_fs_type);
3771 #ifdef CONFIG_EXT4DEV_COMPAT
3772 unregister_filesystem(&ext4dev_fs_type);
3774 destroy_inodecache();
3776 exit_ext4_mballoc();
3777 remove_proc_entry("fs/ext4", NULL);
3780 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3781 MODULE_DESCRIPTION("Fourth Extended Filesystem");
3782 MODULE_LICENSE("GPL");
3783 module_init(init_ext4_fs)
3784 module_exit(exit_ext4_fs)