2 * linux/fs/ext4/super.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/time.h>
23 #include <linux/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/smp_lock.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38 #include <linux/proc_fs.h>
39 #include <linux/ctype.h>
40 #include <linux/log2.h>
41 #include <linux/crc16.h>
42 #include <asm/uaccess.h>
44 #include <linux/kthread.h>
45 #include <linux/freezer.h>
48 #include "ext4_jbd2.h"
53 #define CREATE_TRACE_POINTS
54 #include <trace/events/ext4.h>
56 struct proc_dir_entry *ext4_proc_root;
57 static struct kset *ext4_kset;
58 struct ext4_lazy_init *ext4_li_info;
59 struct mutex ext4_li_mtx;
60 struct ext4_features *ext4_feat;
62 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
63 unsigned long journal_devnum);
64 static int ext4_commit_super(struct super_block *sb, int sync);
65 static void ext4_mark_recovery_complete(struct super_block *sb,
66 struct ext4_super_block *es);
67 static void ext4_clear_journal_err(struct super_block *sb,
68 struct ext4_super_block *es);
69 static int ext4_sync_fs(struct super_block *sb, int wait);
70 static const char *ext4_decode_error(struct super_block *sb, int errno,
72 static int ext4_remount(struct super_block *sb, int *flags, char *data);
73 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
74 static int ext4_unfreeze(struct super_block *sb);
75 static void ext4_write_super(struct super_block *sb);
76 static int ext4_freeze(struct super_block *sb);
77 static int ext4_get_sb(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data, struct vfsmount *mnt);
79 static void ext4_destroy_lazyinit_thread(void);
80 static void ext4_unregister_li_request(struct super_block *sb);
82 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
83 static struct file_system_type ext3_fs_type = {
86 .get_sb = ext4_get_sb,
87 .kill_sb = kill_block_super,
88 .fs_flags = FS_REQUIRES_DEV,
90 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
92 #define IS_EXT3_SB(sb) (0)
95 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
96 struct ext4_group_desc *bg)
98 return le32_to_cpu(bg->bg_block_bitmap_lo) |
99 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
100 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
103 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
104 struct ext4_group_desc *bg)
106 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
107 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
108 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
111 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
112 struct ext4_group_desc *bg)
114 return le32_to_cpu(bg->bg_inode_table_lo) |
115 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
116 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
119 __u32 ext4_free_blks_count(struct super_block *sb,
120 struct ext4_group_desc *bg)
122 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
123 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
124 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
127 __u32 ext4_free_inodes_count(struct super_block *sb,
128 struct ext4_group_desc *bg)
130 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
131 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
132 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
135 __u32 ext4_used_dirs_count(struct super_block *sb,
136 struct ext4_group_desc *bg)
138 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
139 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
140 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
143 __u32 ext4_itable_unused_count(struct super_block *sb,
144 struct ext4_group_desc *bg)
146 return le16_to_cpu(bg->bg_itable_unused_lo) |
147 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
148 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
151 void ext4_block_bitmap_set(struct super_block *sb,
152 struct ext4_group_desc *bg, ext4_fsblk_t blk)
154 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
155 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
156 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
159 void ext4_inode_bitmap_set(struct super_block *sb,
160 struct ext4_group_desc *bg, ext4_fsblk_t blk)
162 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
163 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
164 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
167 void ext4_inode_table_set(struct super_block *sb,
168 struct ext4_group_desc *bg, ext4_fsblk_t blk)
170 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
171 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
172 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
175 void ext4_free_blks_set(struct super_block *sb,
176 struct ext4_group_desc *bg, __u32 count)
178 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
179 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
180 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
183 void ext4_free_inodes_set(struct super_block *sb,
184 struct ext4_group_desc *bg, __u32 count)
186 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
187 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
188 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
191 void ext4_used_dirs_set(struct super_block *sb,
192 struct ext4_group_desc *bg, __u32 count)
194 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
195 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
196 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
199 void ext4_itable_unused_set(struct super_block *sb,
200 struct ext4_group_desc *bg, __u32 count)
202 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
203 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
204 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
208 /* Just increment the non-pointer handle value */
209 static handle_t *ext4_get_nojournal(void)
211 handle_t *handle = current->journal_info;
212 unsigned long ref_cnt = (unsigned long)handle;
214 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
217 handle = (handle_t *)ref_cnt;
219 current->journal_info = handle;
224 /* Decrement the non-pointer handle value */
225 static void ext4_put_nojournal(handle_t *handle)
227 unsigned long ref_cnt = (unsigned long)handle;
229 BUG_ON(ref_cnt == 0);
232 handle = (handle_t *)ref_cnt;
234 current->journal_info = handle;
238 * Wrappers for jbd2_journal_start/end.
240 * The only special thing we need to do here is to make sure that all
241 * journal_end calls result in the superblock being marked dirty, so
242 * that sync() will call the filesystem's write_super callback if
245 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
249 if (sb->s_flags & MS_RDONLY)
250 return ERR_PTR(-EROFS);
252 vfs_check_frozen(sb, SB_FREEZE_TRANS);
253 /* Special case here: if the journal has aborted behind our
254 * backs (eg. EIO in the commit thread), then we still need to
255 * take the FS itself readonly cleanly. */
256 journal = EXT4_SB(sb)->s_journal;
258 if (is_journal_aborted(journal)) {
259 ext4_abort(sb, "Detected aborted journal");
260 return ERR_PTR(-EROFS);
262 return jbd2_journal_start(journal, nblocks);
264 return ext4_get_nojournal();
268 * The only special thing we need to do here is to make sure that all
269 * jbd2_journal_stop calls result in the superblock being marked dirty, so
270 * that sync() will call the filesystem's write_super callback if
273 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
275 struct super_block *sb;
279 if (!ext4_handle_valid(handle)) {
280 ext4_put_nojournal(handle);
283 sb = handle->h_transaction->t_journal->j_private;
285 rc = jbd2_journal_stop(handle);
290 __ext4_std_error(sb, where, line, err);
294 void ext4_journal_abort_handle(const char *caller, unsigned int line,
295 const char *err_fn, struct buffer_head *bh,
296 handle_t *handle, int err)
299 const char *errstr = ext4_decode_error(NULL, err, nbuf);
301 BUG_ON(!ext4_handle_valid(handle));
304 BUFFER_TRACE(bh, "abort");
309 if (is_handle_aborted(handle))
312 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
313 caller, line, errstr, err_fn);
315 jbd2_journal_abort_handle(handle);
318 static void __save_error_info(struct super_block *sb, const char *func,
321 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
323 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
324 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
325 es->s_last_error_time = cpu_to_le32(get_seconds());
326 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
327 es->s_last_error_line = cpu_to_le32(line);
328 if (!es->s_first_error_time) {
329 es->s_first_error_time = es->s_last_error_time;
330 strncpy(es->s_first_error_func, func,
331 sizeof(es->s_first_error_func));
332 es->s_first_error_line = cpu_to_le32(line);
333 es->s_first_error_ino = es->s_last_error_ino;
334 es->s_first_error_block = es->s_last_error_block;
337 * Start the daily error reporting function if it hasn't been
340 if (!es->s_error_count)
341 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
342 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
345 static void save_error_info(struct super_block *sb, const char *func,
348 __save_error_info(sb, func, line);
349 ext4_commit_super(sb, 1);
353 /* Deal with the reporting of failure conditions on a filesystem such as
354 * inconsistencies detected or read IO failures.
356 * On ext2, we can store the error state of the filesystem in the
357 * superblock. That is not possible on ext4, because we may have other
358 * write ordering constraints on the superblock which prevent us from
359 * writing it out straight away; and given that the journal is about to
360 * be aborted, we can't rely on the current, or future, transactions to
361 * write out the superblock safely.
363 * We'll just use the jbd2_journal_abort() error code to record an error in
364 * the journal instead. On recovery, the journal will complain about
365 * that error until we've noted it down and cleared it.
368 static void ext4_handle_error(struct super_block *sb)
370 if (sb->s_flags & MS_RDONLY)
373 if (!test_opt(sb, ERRORS_CONT)) {
374 journal_t *journal = EXT4_SB(sb)->s_journal;
376 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
378 jbd2_journal_abort(journal, -EIO);
380 if (test_opt(sb, ERRORS_RO)) {
381 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
382 sb->s_flags |= MS_RDONLY;
384 if (test_opt(sb, ERRORS_PANIC))
385 panic("EXT4-fs (device %s): panic forced after error\n",
389 void __ext4_error(struct super_block *sb, const char *function,
390 unsigned int line, const char *fmt, ...)
395 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: ",
396 sb->s_id, function, line, current->comm);
401 ext4_handle_error(sb);
404 void ext4_error_inode(struct inode *inode, const char *function,
405 unsigned int line, ext4_fsblk_t block,
406 const char *fmt, ...)
409 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
411 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
412 es->s_last_error_block = cpu_to_le64(block);
413 save_error_info(inode->i_sb, function, line);
415 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
416 inode->i_sb->s_id, function, line, inode->i_ino);
418 printk("block %llu: ", block);
419 printk("comm %s: ", current->comm);
424 ext4_handle_error(inode->i_sb);
427 void ext4_error_file(struct file *file, const char *function,
428 unsigned int line, const char *fmt, ...)
431 struct ext4_super_block *es;
432 struct inode *inode = file->f_dentry->d_inode;
433 char pathname[80], *path;
435 es = EXT4_SB(inode->i_sb)->s_es;
436 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
437 save_error_info(inode->i_sb, function, line);
439 path = d_path(&(file->f_path), pathname, sizeof(pathname));
443 "EXT4-fs error (device %s): %s:%d: inode #%lu "
444 "(comm %s path %s): ",
445 inode->i_sb->s_id, function, line, inode->i_ino,
446 current->comm, path);
451 ext4_handle_error(inode->i_sb);
454 static const char *ext4_decode_error(struct super_block *sb, int errno,
461 errstr = "IO failure";
464 errstr = "Out of memory";
467 if (!sb || (EXT4_SB(sb)->s_journal &&
468 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
469 errstr = "Journal has aborted";
471 errstr = "Readonly filesystem";
474 /* If the caller passed in an extra buffer for unknown
475 * errors, textualise them now. Else we just return
478 /* Check for truncated error codes... */
479 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
488 /* __ext4_std_error decodes expected errors from journaling functions
489 * automatically and invokes the appropriate error response. */
491 void __ext4_std_error(struct super_block *sb, const char *function,
492 unsigned int line, int errno)
497 /* Special case: if the error is EROFS, and we're not already
498 * inside a transaction, then there's really no point in logging
500 if (errno == -EROFS && journal_current_handle() == NULL &&
501 (sb->s_flags & MS_RDONLY))
504 errstr = ext4_decode_error(sb, errno, nbuf);
505 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
506 sb->s_id, function, line, errstr);
507 save_error_info(sb, function, line);
509 ext4_handle_error(sb);
513 * ext4_abort is a much stronger failure handler than ext4_error. The
514 * abort function may be used to deal with unrecoverable failures such
515 * as journal IO errors or ENOMEM at a critical moment in log management.
517 * We unconditionally force the filesystem into an ABORT|READONLY state,
518 * unless the error response on the fs has been set to panic in which
519 * case we take the easy way out and panic immediately.
522 void __ext4_abort(struct super_block *sb, const char *function,
523 unsigned int line, const char *fmt, ...)
527 save_error_info(sb, function, line);
529 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
535 if ((sb->s_flags & MS_RDONLY) == 0) {
536 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
537 sb->s_flags |= MS_RDONLY;
538 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
539 if (EXT4_SB(sb)->s_journal)
540 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
541 save_error_info(sb, function, line);
543 if (test_opt(sb, ERRORS_PANIC))
544 panic("EXT4-fs panic from previous error\n");
547 void ext4_msg (struct super_block * sb, const char *prefix,
548 const char *fmt, ...)
553 printk("%sEXT4-fs (%s): ", prefix, sb->s_id);
559 void __ext4_warning(struct super_block *sb, const char *function,
560 unsigned int line, const char *fmt, ...)
565 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: ",
566 sb->s_id, function, line);
572 void __ext4_grp_locked_error(const char *function, unsigned int line,
573 struct super_block *sb, ext4_group_t grp,
574 unsigned long ino, ext4_fsblk_t block,
575 const char *fmt, ...)
580 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
582 es->s_last_error_ino = cpu_to_le32(ino);
583 es->s_last_error_block = cpu_to_le64(block);
584 __save_error_info(sb, function, line);
586 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u",
587 sb->s_id, function, line, grp);
589 printk("inode %lu: ", ino);
591 printk("block %llu:", (unsigned long long) block);
596 if (test_opt(sb, ERRORS_CONT)) {
597 ext4_commit_super(sb, 0);
601 ext4_unlock_group(sb, grp);
602 ext4_handle_error(sb);
604 * We only get here in the ERRORS_RO case; relocking the group
605 * may be dangerous, but nothing bad will happen since the
606 * filesystem will have already been marked read/only and the
607 * journal has been aborted. We return 1 as a hint to callers
608 * who might what to use the return value from
609 * ext4_grp_locked_error() to distinguish beween the
610 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
611 * aggressively from the ext4 function in question, with a
612 * more appropriate error code.
614 ext4_lock_group(sb, grp);
618 void ext4_update_dynamic_rev(struct super_block *sb)
620 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
622 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
626 "updating to rev %d because of new feature flag, "
627 "running e2fsck is recommended",
630 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
631 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
632 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
633 /* leave es->s_feature_*compat flags alone */
634 /* es->s_uuid will be set by e2fsck if empty */
637 * The rest of the superblock fields should be zero, and if not it
638 * means they are likely already in use, so leave them alone. We
639 * can leave it up to e2fsck to clean up any inconsistencies there.
644 * Open the external journal device
646 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
648 struct block_device *bdev;
649 char b[BDEVNAME_SIZE];
651 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
657 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
658 __bdevname(dev, b), PTR_ERR(bdev));
663 * Release the journal device
665 static int ext4_blkdev_put(struct block_device *bdev)
668 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
671 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
673 struct block_device *bdev;
676 bdev = sbi->journal_bdev;
678 ret = ext4_blkdev_put(bdev);
679 sbi->journal_bdev = NULL;
684 static inline struct inode *orphan_list_entry(struct list_head *l)
686 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
689 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
693 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
694 le32_to_cpu(sbi->s_es->s_last_orphan));
696 printk(KERN_ERR "sb_info orphan list:\n");
697 list_for_each(l, &sbi->s_orphan) {
698 struct inode *inode = orphan_list_entry(l);
700 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
701 inode->i_sb->s_id, inode->i_ino, inode,
702 inode->i_mode, inode->i_nlink,
707 static void ext4_put_super(struct super_block *sb)
709 struct ext4_sb_info *sbi = EXT4_SB(sb);
710 struct ext4_super_block *es = sbi->s_es;
713 ext4_unregister_li_request(sb);
714 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
716 flush_workqueue(sbi->dio_unwritten_wq);
717 destroy_workqueue(sbi->dio_unwritten_wq);
722 ext4_commit_super(sb, 1);
724 if (sbi->s_journal) {
725 err = jbd2_journal_destroy(sbi->s_journal);
726 sbi->s_journal = NULL;
728 ext4_abort(sb, "Couldn't clean up the journal");
731 del_timer(&sbi->s_err_report);
732 ext4_release_system_zone(sb);
734 ext4_ext_release(sb);
735 ext4_xattr_put_super(sb);
737 if (!(sb->s_flags & MS_RDONLY)) {
738 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
739 es->s_state = cpu_to_le16(sbi->s_mount_state);
740 ext4_commit_super(sb, 1);
743 remove_proc_entry(sb->s_id, ext4_proc_root);
745 kobject_del(&sbi->s_kobj);
747 for (i = 0; i < sbi->s_gdb_count; i++)
748 brelse(sbi->s_group_desc[i]);
749 kfree(sbi->s_group_desc);
750 if (is_vmalloc_addr(sbi->s_flex_groups))
751 vfree(sbi->s_flex_groups);
753 kfree(sbi->s_flex_groups);
754 percpu_counter_destroy(&sbi->s_freeblocks_counter);
755 percpu_counter_destroy(&sbi->s_freeinodes_counter);
756 percpu_counter_destroy(&sbi->s_dirs_counter);
757 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
760 for (i = 0; i < MAXQUOTAS; i++)
761 kfree(sbi->s_qf_names[i]);
764 /* Debugging code just in case the in-memory inode orphan list
765 * isn't empty. The on-disk one can be non-empty if we've
766 * detected an error and taken the fs readonly, but the
767 * in-memory list had better be clean by this point. */
768 if (!list_empty(&sbi->s_orphan))
769 dump_orphan_list(sb, sbi);
770 J_ASSERT(list_empty(&sbi->s_orphan));
772 invalidate_bdev(sb->s_bdev);
773 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
775 * Invalidate the journal device's buffers. We don't want them
776 * floating about in memory - the physical journal device may
777 * hotswapped, and it breaks the `ro-after' testing code.
779 sync_blockdev(sbi->journal_bdev);
780 invalidate_bdev(sbi->journal_bdev);
781 ext4_blkdev_remove(sbi);
783 sb->s_fs_info = NULL;
785 * Now that we are completely done shutting down the
786 * superblock, we need to actually destroy the kobject.
790 kobject_put(&sbi->s_kobj);
791 wait_for_completion(&sbi->s_kobj_unregister);
792 kfree(sbi->s_blockgroup_lock);
796 static struct kmem_cache *ext4_inode_cachep;
799 * Called inside transaction, so use GFP_NOFS
801 static struct inode *ext4_alloc_inode(struct super_block *sb)
803 struct ext4_inode_info *ei;
805 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
809 ei->vfs_inode.i_version = 1;
810 ei->vfs_inode.i_data.writeback_index = 0;
811 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
812 INIT_LIST_HEAD(&ei->i_prealloc_list);
813 spin_lock_init(&ei->i_prealloc_lock);
815 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
816 * therefore it can be null here. Don't check it, just initialize
819 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
820 ei->i_reserved_data_blocks = 0;
821 ei->i_reserved_meta_blocks = 0;
822 ei->i_allocated_meta_blocks = 0;
823 ei->i_da_metadata_calc_len = 0;
824 ei->i_delalloc_reserved_flag = 0;
825 spin_lock_init(&(ei->i_block_reservation_lock));
827 ei->i_reserved_quota = 0;
829 INIT_LIST_HEAD(&ei->i_completed_io_list);
830 spin_lock_init(&ei->i_completed_io_lock);
831 ei->cur_aio_dio = NULL;
833 ei->i_datasync_tid = 0;
835 return &ei->vfs_inode;
838 static void ext4_destroy_inode(struct inode *inode)
840 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
841 ext4_msg(inode->i_sb, KERN_ERR,
842 "Inode %lu (%p): orphan list check failed!",
843 inode->i_ino, EXT4_I(inode));
844 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
845 EXT4_I(inode), sizeof(struct ext4_inode_info),
849 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
852 static void init_once(void *foo)
854 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
856 INIT_LIST_HEAD(&ei->i_orphan);
857 #ifdef CONFIG_EXT4_FS_XATTR
858 init_rwsem(&ei->xattr_sem);
860 init_rwsem(&ei->i_data_sem);
861 inode_init_once(&ei->vfs_inode);
864 static int init_inodecache(void)
866 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
867 sizeof(struct ext4_inode_info),
868 0, (SLAB_RECLAIM_ACCOUNT|
871 if (ext4_inode_cachep == NULL)
876 static void destroy_inodecache(void)
878 kmem_cache_destroy(ext4_inode_cachep);
881 void ext4_clear_inode(struct inode *inode)
883 invalidate_inode_buffers(inode);
884 end_writeback(inode);
886 ext4_discard_preallocations(inode);
887 if (EXT4_JOURNAL(inode))
888 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
889 &EXT4_I(inode)->jinode);
892 static inline void ext4_show_quota_options(struct seq_file *seq,
893 struct super_block *sb)
895 #if defined(CONFIG_QUOTA)
896 struct ext4_sb_info *sbi = EXT4_SB(sb);
898 if (sbi->s_jquota_fmt) {
901 switch (sbi->s_jquota_fmt) {
912 seq_printf(seq, ",jqfmt=%s", fmtname);
915 if (sbi->s_qf_names[USRQUOTA])
916 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
918 if (sbi->s_qf_names[GRPQUOTA])
919 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
921 if (test_opt(sb, USRQUOTA))
922 seq_puts(seq, ",usrquota");
924 if (test_opt(sb, GRPQUOTA))
925 seq_puts(seq, ",grpquota");
931 * - it's set to a non-default value OR
932 * - if the per-sb default is different from the global default
934 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
937 unsigned long def_mount_opts;
938 struct super_block *sb = vfs->mnt_sb;
939 struct ext4_sb_info *sbi = EXT4_SB(sb);
940 struct ext4_super_block *es = sbi->s_es;
942 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
943 def_errors = le16_to_cpu(es->s_errors);
945 if (sbi->s_sb_block != 1)
946 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
947 if (test_opt(sb, MINIX_DF))
948 seq_puts(seq, ",minixdf");
949 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
950 seq_puts(seq, ",grpid");
951 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
952 seq_puts(seq, ",nogrpid");
953 if (sbi->s_resuid != EXT4_DEF_RESUID ||
954 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
955 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
957 if (sbi->s_resgid != EXT4_DEF_RESGID ||
958 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
959 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
961 if (test_opt(sb, ERRORS_RO)) {
962 if (def_errors == EXT4_ERRORS_PANIC ||
963 def_errors == EXT4_ERRORS_CONTINUE) {
964 seq_puts(seq, ",errors=remount-ro");
967 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
968 seq_puts(seq, ",errors=continue");
969 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
970 seq_puts(seq, ",errors=panic");
971 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
972 seq_puts(seq, ",nouid32");
973 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
974 seq_puts(seq, ",debug");
975 if (test_opt(sb, OLDALLOC))
976 seq_puts(seq, ",oldalloc");
977 #ifdef CONFIG_EXT4_FS_XATTR
978 if (test_opt(sb, XATTR_USER) &&
979 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
980 seq_puts(seq, ",user_xattr");
981 if (!test_opt(sb, XATTR_USER) &&
982 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
983 seq_puts(seq, ",nouser_xattr");
986 #ifdef CONFIG_EXT4_FS_POSIX_ACL
987 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
988 seq_puts(seq, ",acl");
989 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
990 seq_puts(seq, ",noacl");
992 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
993 seq_printf(seq, ",commit=%u",
994 (unsigned) (sbi->s_commit_interval / HZ));
996 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
997 seq_printf(seq, ",min_batch_time=%u",
998 (unsigned) sbi->s_min_batch_time);
1000 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
1001 seq_printf(seq, ",max_batch_time=%u",
1002 (unsigned) sbi->s_min_batch_time);
1006 * We're changing the default of barrier mount option, so
1007 * let's always display its mount state so it's clear what its
1010 seq_puts(seq, ",barrier=");
1011 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
1012 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
1013 seq_puts(seq, ",journal_async_commit");
1014 else if (test_opt(sb, JOURNAL_CHECKSUM))
1015 seq_puts(seq, ",journal_checksum");
1016 if (test_opt(sb, I_VERSION))
1017 seq_puts(seq, ",i_version");
1018 if (!test_opt(sb, DELALLOC) &&
1019 !(def_mount_opts & EXT4_DEFM_NODELALLOC))
1020 seq_puts(seq, ",nodelalloc");
1023 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
1025 * journal mode get enabled in different ways
1026 * So just print the value even if we didn't specify it
1028 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1029 seq_puts(seq, ",data=journal");
1030 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1031 seq_puts(seq, ",data=ordered");
1032 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1033 seq_puts(seq, ",data=writeback");
1035 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1036 seq_printf(seq, ",inode_readahead_blks=%u",
1037 sbi->s_inode_readahead_blks);
1039 if (test_opt(sb, DATA_ERR_ABORT))
1040 seq_puts(seq, ",data_err=abort");
1042 if (test_opt(sb, NO_AUTO_DA_ALLOC))
1043 seq_puts(seq, ",noauto_da_alloc");
1045 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
1046 seq_puts(seq, ",discard");
1048 if (test_opt(sb, NOLOAD))
1049 seq_puts(seq, ",norecovery");
1051 if (test_opt(sb, DIOREAD_NOLOCK))
1052 seq_puts(seq, ",dioread_nolock");
1054 if (test_opt(sb, BLOCK_VALIDITY) &&
1055 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
1056 seq_puts(seq, ",block_validity");
1058 if (!test_opt(sb, INIT_INODE_TABLE))
1059 seq_puts(seq, ",noinit_inode_table");
1060 else if (sbi->s_li_wait_mult)
1061 seq_printf(seq, ",init_inode_table=%u",
1062 (unsigned) sbi->s_li_wait_mult);
1064 ext4_show_quota_options(seq, sb);
1069 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1070 u64 ino, u32 generation)
1072 struct inode *inode;
1074 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1075 return ERR_PTR(-ESTALE);
1076 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1077 return ERR_PTR(-ESTALE);
1079 /* iget isn't really right if the inode is currently unallocated!!
1081 * ext4_read_inode will return a bad_inode if the inode had been
1082 * deleted, so we should be safe.
1084 * Currently we don't know the generation for parent directory, so
1085 * a generation of 0 means "accept any"
1087 inode = ext4_iget(sb, ino);
1089 return ERR_CAST(inode);
1090 if (generation && inode->i_generation != generation) {
1092 return ERR_PTR(-ESTALE);
1098 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1099 int fh_len, int fh_type)
1101 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1102 ext4_nfs_get_inode);
1105 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1106 int fh_len, int fh_type)
1108 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1109 ext4_nfs_get_inode);
1113 * Try to release metadata pages (indirect blocks, directories) which are
1114 * mapped via the block device. Since these pages could have journal heads
1115 * which would prevent try_to_free_buffers() from freeing them, we must use
1116 * jbd2 layer's try_to_free_buffers() function to release them.
1118 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1121 journal_t *journal = EXT4_SB(sb)->s_journal;
1123 WARN_ON(PageChecked(page));
1124 if (!page_has_buffers(page))
1127 return jbd2_journal_try_to_free_buffers(journal, page,
1128 wait & ~__GFP_WAIT);
1129 return try_to_free_buffers(page);
1133 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1134 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1136 static int ext4_write_dquot(struct dquot *dquot);
1137 static int ext4_acquire_dquot(struct dquot *dquot);
1138 static int ext4_release_dquot(struct dquot *dquot);
1139 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1140 static int ext4_write_info(struct super_block *sb, int type);
1141 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1143 static int ext4_quota_off(struct super_block *sb, int type);
1144 static int ext4_quota_on_mount(struct super_block *sb, int type);
1145 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1146 size_t len, loff_t off);
1147 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1148 const char *data, size_t len, loff_t off);
1150 static const struct dquot_operations ext4_quota_operations = {
1152 .get_reserved_space = ext4_get_reserved_space,
1154 .write_dquot = ext4_write_dquot,
1155 .acquire_dquot = ext4_acquire_dquot,
1156 .release_dquot = ext4_release_dquot,
1157 .mark_dirty = ext4_mark_dquot_dirty,
1158 .write_info = ext4_write_info,
1159 .alloc_dquot = dquot_alloc,
1160 .destroy_dquot = dquot_destroy,
1163 static const struct quotactl_ops ext4_qctl_operations = {
1164 .quota_on = ext4_quota_on,
1165 .quota_off = ext4_quota_off,
1166 .quota_sync = dquot_quota_sync,
1167 .get_info = dquot_get_dqinfo,
1168 .set_info = dquot_set_dqinfo,
1169 .get_dqblk = dquot_get_dqblk,
1170 .set_dqblk = dquot_set_dqblk
1174 static const struct super_operations ext4_sops = {
1175 .alloc_inode = ext4_alloc_inode,
1176 .destroy_inode = ext4_destroy_inode,
1177 .write_inode = ext4_write_inode,
1178 .dirty_inode = ext4_dirty_inode,
1179 .evict_inode = ext4_evict_inode,
1180 .put_super = ext4_put_super,
1181 .sync_fs = ext4_sync_fs,
1182 .freeze_fs = ext4_freeze,
1183 .unfreeze_fs = ext4_unfreeze,
1184 .statfs = ext4_statfs,
1185 .remount_fs = ext4_remount,
1186 .show_options = ext4_show_options,
1188 .quota_read = ext4_quota_read,
1189 .quota_write = ext4_quota_write,
1191 .bdev_try_to_free_page = bdev_try_to_free_page,
1192 .trim_fs = ext4_trim_fs
1195 static const struct super_operations ext4_nojournal_sops = {
1196 .alloc_inode = ext4_alloc_inode,
1197 .destroy_inode = ext4_destroy_inode,
1198 .write_inode = ext4_write_inode,
1199 .dirty_inode = ext4_dirty_inode,
1200 .evict_inode = ext4_evict_inode,
1201 .write_super = ext4_write_super,
1202 .put_super = ext4_put_super,
1203 .statfs = ext4_statfs,
1204 .remount_fs = ext4_remount,
1205 .show_options = ext4_show_options,
1207 .quota_read = ext4_quota_read,
1208 .quota_write = ext4_quota_write,
1210 .bdev_try_to_free_page = bdev_try_to_free_page,
1213 static const struct export_operations ext4_export_ops = {
1214 .fh_to_dentry = ext4_fh_to_dentry,
1215 .fh_to_parent = ext4_fh_to_parent,
1216 .get_parent = ext4_get_parent,
1220 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1221 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1222 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1223 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1224 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1225 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1226 Opt_journal_update, Opt_journal_dev,
1227 Opt_journal_checksum, Opt_journal_async_commit,
1228 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1229 Opt_data_err_abort, Opt_data_err_ignore,
1230 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1231 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1232 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1233 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
1234 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
1235 Opt_block_validity, Opt_noblock_validity,
1236 Opt_inode_readahead_blks, Opt_journal_ioprio,
1237 Opt_dioread_nolock, Opt_dioread_lock,
1238 Opt_discard, Opt_nodiscard,
1239 Opt_init_inode_table, Opt_noinit_inode_table,
1242 static const match_table_t tokens = {
1243 {Opt_bsd_df, "bsddf"},
1244 {Opt_minix_df, "minixdf"},
1245 {Opt_grpid, "grpid"},
1246 {Opt_grpid, "bsdgroups"},
1247 {Opt_nogrpid, "nogrpid"},
1248 {Opt_nogrpid, "sysvgroups"},
1249 {Opt_resgid, "resgid=%u"},
1250 {Opt_resuid, "resuid=%u"},
1252 {Opt_err_cont, "errors=continue"},
1253 {Opt_err_panic, "errors=panic"},
1254 {Opt_err_ro, "errors=remount-ro"},
1255 {Opt_nouid32, "nouid32"},
1256 {Opt_debug, "debug"},
1257 {Opt_oldalloc, "oldalloc"},
1258 {Opt_orlov, "orlov"},
1259 {Opt_user_xattr, "user_xattr"},
1260 {Opt_nouser_xattr, "nouser_xattr"},
1262 {Opt_noacl, "noacl"},
1263 {Opt_noload, "noload"},
1264 {Opt_noload, "norecovery"},
1267 {Opt_commit, "commit=%u"},
1268 {Opt_min_batch_time, "min_batch_time=%u"},
1269 {Opt_max_batch_time, "max_batch_time=%u"},
1270 {Opt_journal_update, "journal=update"},
1271 {Opt_journal_dev, "journal_dev=%u"},
1272 {Opt_journal_checksum, "journal_checksum"},
1273 {Opt_journal_async_commit, "journal_async_commit"},
1274 {Opt_abort, "abort"},
1275 {Opt_data_journal, "data=journal"},
1276 {Opt_data_ordered, "data=ordered"},
1277 {Opt_data_writeback, "data=writeback"},
1278 {Opt_data_err_abort, "data_err=abort"},
1279 {Opt_data_err_ignore, "data_err=ignore"},
1280 {Opt_offusrjquota, "usrjquota="},
1281 {Opt_usrjquota, "usrjquota=%s"},
1282 {Opt_offgrpjquota, "grpjquota="},
1283 {Opt_grpjquota, "grpjquota=%s"},
1284 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1285 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1286 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1287 {Opt_grpquota, "grpquota"},
1288 {Opt_noquota, "noquota"},
1289 {Opt_quota, "quota"},
1290 {Opt_usrquota, "usrquota"},
1291 {Opt_barrier, "barrier=%u"},
1292 {Opt_barrier, "barrier"},
1293 {Opt_nobarrier, "nobarrier"},
1294 {Opt_i_version, "i_version"},
1295 {Opt_stripe, "stripe=%u"},
1296 {Opt_resize, "resize"},
1297 {Opt_delalloc, "delalloc"},
1298 {Opt_nodelalloc, "nodelalloc"},
1299 {Opt_block_validity, "block_validity"},
1300 {Opt_noblock_validity, "noblock_validity"},
1301 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1302 {Opt_journal_ioprio, "journal_ioprio=%u"},
1303 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1304 {Opt_auto_da_alloc, "auto_da_alloc"},
1305 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1306 {Opt_dioread_nolock, "dioread_nolock"},
1307 {Opt_dioread_lock, "dioread_lock"},
1308 {Opt_discard, "discard"},
1309 {Opt_nodiscard, "nodiscard"},
1310 {Opt_init_inode_table, "init_itable=%u"},
1311 {Opt_init_inode_table, "init_itable"},
1312 {Opt_noinit_inode_table, "noinit_itable"},
1316 static ext4_fsblk_t get_sb_block(void **data)
1318 ext4_fsblk_t sb_block;
1319 char *options = (char *) *data;
1321 if (!options || strncmp(options, "sb=", 3) != 0)
1322 return 1; /* Default location */
1325 /* TODO: use simple_strtoll with >32bit ext4 */
1326 sb_block = simple_strtoul(options, &options, 0);
1327 if (*options && *options != ',') {
1328 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1332 if (*options == ',')
1334 *data = (void *) options;
1339 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1340 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1341 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1344 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1346 struct ext4_sb_info *sbi = EXT4_SB(sb);
1349 if (sb_any_quota_loaded(sb) &&
1350 !sbi->s_qf_names[qtype]) {
1351 ext4_msg(sb, KERN_ERR,
1352 "Cannot change journaled "
1353 "quota options when quota turned on");
1356 qname = match_strdup(args);
1358 ext4_msg(sb, KERN_ERR,
1359 "Not enough memory for storing quotafile name");
1362 if (sbi->s_qf_names[qtype] &&
1363 strcmp(sbi->s_qf_names[qtype], qname)) {
1364 ext4_msg(sb, KERN_ERR,
1365 "%s quota file already specified", QTYPE2NAME(qtype));
1369 sbi->s_qf_names[qtype] = qname;
1370 if (strchr(sbi->s_qf_names[qtype], '/')) {
1371 ext4_msg(sb, KERN_ERR,
1372 "quotafile must be on filesystem root");
1373 kfree(sbi->s_qf_names[qtype]);
1374 sbi->s_qf_names[qtype] = NULL;
1377 set_opt(sbi->s_mount_opt, QUOTA);
1381 static int clear_qf_name(struct super_block *sb, int qtype)
1384 struct ext4_sb_info *sbi = EXT4_SB(sb);
1386 if (sb_any_quota_loaded(sb) &&
1387 sbi->s_qf_names[qtype]) {
1388 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1389 " when quota turned on");
1393 * The space will be released later when all options are confirmed
1396 sbi->s_qf_names[qtype] = NULL;
1401 static int parse_options(char *options, struct super_block *sb,
1402 unsigned long *journal_devnum,
1403 unsigned int *journal_ioprio,
1404 ext4_fsblk_t *n_blocks_count, int is_remount)
1406 struct ext4_sb_info *sbi = EXT4_SB(sb);
1408 substring_t args[MAX_OPT_ARGS];
1418 while ((p = strsep(&options, ",")) != NULL) {
1424 * Initialize args struct so we know whether arg was
1425 * found; some options take optional arguments.
1427 args[0].to = args[0].from = 0;
1428 token = match_token(p, tokens, args);
1431 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1432 clear_opt(sbi->s_mount_opt, MINIX_DF);
1435 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1436 set_opt(sbi->s_mount_opt, MINIX_DF);
1440 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1441 set_opt(sbi->s_mount_opt, GRPID);
1445 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1446 clear_opt(sbi->s_mount_opt, GRPID);
1450 if (match_int(&args[0], &option))
1452 sbi->s_resuid = option;
1455 if (match_int(&args[0], &option))
1457 sbi->s_resgid = option;
1460 /* handled by get_sb_block() instead of here */
1461 /* *sb_block = match_int(&args[0]); */
1464 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1465 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1466 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1469 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1470 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1471 set_opt(sbi->s_mount_opt, ERRORS_RO);
1474 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1475 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1476 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1479 set_opt(sbi->s_mount_opt, NO_UID32);
1482 set_opt(sbi->s_mount_opt, DEBUG);
1485 set_opt(sbi->s_mount_opt, OLDALLOC);
1488 clear_opt(sbi->s_mount_opt, OLDALLOC);
1490 #ifdef CONFIG_EXT4_FS_XATTR
1491 case Opt_user_xattr:
1492 set_opt(sbi->s_mount_opt, XATTR_USER);
1494 case Opt_nouser_xattr:
1495 clear_opt(sbi->s_mount_opt, XATTR_USER);
1498 case Opt_user_xattr:
1499 case Opt_nouser_xattr:
1500 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
1503 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1505 set_opt(sbi->s_mount_opt, POSIX_ACL);
1508 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1513 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
1516 case Opt_journal_update:
1518 /* Eventually we will want to be able to create
1519 a journal file here. For now, only allow the
1520 user to specify an existing inode to be the
1523 ext4_msg(sb, KERN_ERR,
1524 "Cannot specify journal on remount");
1527 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1529 case Opt_journal_dev:
1531 ext4_msg(sb, KERN_ERR,
1532 "Cannot specify journal on remount");
1535 if (match_int(&args[0], &option))
1537 *journal_devnum = option;
1539 case Opt_journal_checksum:
1540 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1542 case Opt_journal_async_commit:
1543 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1544 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1547 set_opt(sbi->s_mount_opt, NOLOAD);
1550 if (match_int(&args[0], &option))
1555 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1556 sbi->s_commit_interval = HZ * option;
1558 case Opt_max_batch_time:
1559 if (match_int(&args[0], &option))
1564 option = EXT4_DEF_MAX_BATCH_TIME;
1565 sbi->s_max_batch_time = option;
1567 case Opt_min_batch_time:
1568 if (match_int(&args[0], &option))
1572 sbi->s_min_batch_time = option;
1574 case Opt_data_journal:
1575 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1577 case Opt_data_ordered:
1578 data_opt = EXT4_MOUNT_ORDERED_DATA;
1580 case Opt_data_writeback:
1581 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1584 if (test_opt(sb, DATA_FLAGS) != data_opt) {
1585 ext4_msg(sb, KERN_ERR,
1586 "Cannot change data mode on remount");
1590 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1591 sbi->s_mount_opt |= data_opt;
1594 case Opt_data_err_abort:
1595 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1597 case Opt_data_err_ignore:
1598 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1602 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1606 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1609 case Opt_offusrjquota:
1610 if (!clear_qf_name(sb, USRQUOTA))
1613 case Opt_offgrpjquota:
1614 if (!clear_qf_name(sb, GRPQUOTA))
1618 case Opt_jqfmt_vfsold:
1619 qfmt = QFMT_VFS_OLD;
1621 case Opt_jqfmt_vfsv0:
1624 case Opt_jqfmt_vfsv1:
1627 if (sb_any_quota_loaded(sb) &&
1628 sbi->s_jquota_fmt != qfmt) {
1629 ext4_msg(sb, KERN_ERR, "Cannot change "
1630 "journaled quota options when "
1634 sbi->s_jquota_fmt = qfmt;
1638 set_opt(sbi->s_mount_opt, QUOTA);
1639 set_opt(sbi->s_mount_opt, USRQUOTA);
1642 set_opt(sbi->s_mount_opt, QUOTA);
1643 set_opt(sbi->s_mount_opt, GRPQUOTA);
1646 if (sb_any_quota_loaded(sb)) {
1647 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1648 "options when quota turned on");
1651 clear_opt(sbi->s_mount_opt, QUOTA);
1652 clear_opt(sbi->s_mount_opt, USRQUOTA);
1653 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1659 ext4_msg(sb, KERN_ERR,
1660 "quota options not supported");
1664 case Opt_offusrjquota:
1665 case Opt_offgrpjquota:
1666 case Opt_jqfmt_vfsold:
1667 case Opt_jqfmt_vfsv0:
1668 case Opt_jqfmt_vfsv1:
1669 ext4_msg(sb, KERN_ERR,
1670 "journaled quota options not supported");
1676 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1679 clear_opt(sbi->s_mount_opt, BARRIER);
1683 if (match_int(&args[0], &option))
1686 option = 1; /* No argument, default to 1 */
1688 set_opt(sbi->s_mount_opt, BARRIER);
1690 clear_opt(sbi->s_mount_opt, BARRIER);
1696 ext4_msg(sb, KERN_ERR,
1697 "resize option only available "
1701 if (match_int(&args[0], &option) != 0)
1703 *n_blocks_count = option;
1706 ext4_msg(sb, KERN_WARNING,
1707 "Ignoring deprecated nobh option");
1710 ext4_msg(sb, KERN_WARNING,
1711 "Ignoring deprecated bh option");
1714 set_opt(sbi->s_mount_opt, I_VERSION);
1715 sb->s_flags |= MS_I_VERSION;
1717 case Opt_nodelalloc:
1718 clear_opt(sbi->s_mount_opt, DELALLOC);
1721 if (match_int(&args[0], &option))
1725 sbi->s_stripe = option;
1728 set_opt(sbi->s_mount_opt, DELALLOC);
1730 case Opt_block_validity:
1731 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1733 case Opt_noblock_validity:
1734 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1736 case Opt_inode_readahead_blks:
1737 if (match_int(&args[0], &option))
1739 if (option < 0 || option > (1 << 30))
1741 if (!is_power_of_2(option)) {
1742 ext4_msg(sb, KERN_ERR,
1743 "EXT4-fs: inode_readahead_blks"
1744 " must be a power of 2");
1747 sbi->s_inode_readahead_blks = option;
1749 case Opt_journal_ioprio:
1750 if (match_int(&args[0], &option))
1752 if (option < 0 || option > 7)
1754 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1757 case Opt_noauto_da_alloc:
1758 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1760 case Opt_auto_da_alloc:
1762 if (match_int(&args[0], &option))
1765 option = 1; /* No argument, default to 1 */
1767 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1769 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1772 set_opt(sbi->s_mount_opt, DISCARD);
1775 clear_opt(sbi->s_mount_opt, DISCARD);
1777 case Opt_dioread_nolock:
1778 set_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1780 case Opt_dioread_lock:
1781 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1783 case Opt_init_inode_table:
1784 set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1786 if (match_int(&args[0], &option))
1789 option = EXT4_DEF_LI_WAIT_MULT;
1792 sbi->s_li_wait_mult = option;
1794 case Opt_noinit_inode_table:
1795 clear_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1798 ext4_msg(sb, KERN_ERR,
1799 "Unrecognized mount option \"%s\" "
1800 "or missing value", p);
1805 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1806 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1807 clear_opt(sbi->s_mount_opt, USRQUOTA);
1809 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1810 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1812 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1813 ext4_msg(sb, KERN_ERR, "old and new quota "
1818 if (!sbi->s_jquota_fmt) {
1819 ext4_msg(sb, KERN_ERR, "journaled quota format "
1824 if (sbi->s_jquota_fmt) {
1825 ext4_msg(sb, KERN_ERR, "journaled quota format "
1826 "specified with no journaling "
1835 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1838 struct ext4_sb_info *sbi = EXT4_SB(sb);
1841 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1842 ext4_msg(sb, KERN_ERR, "revision level too high, "
1843 "forcing read-only mode");
1848 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1849 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1850 "running e2fsck is recommended");
1851 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1852 ext4_msg(sb, KERN_WARNING,
1853 "warning: mounting fs with errors, "
1854 "running e2fsck is recommended");
1855 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1856 le16_to_cpu(es->s_mnt_count) >=
1857 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1858 ext4_msg(sb, KERN_WARNING,
1859 "warning: maximal mount count reached, "
1860 "running e2fsck is recommended");
1861 else if (le32_to_cpu(es->s_checkinterval) &&
1862 (le32_to_cpu(es->s_lastcheck) +
1863 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1864 ext4_msg(sb, KERN_WARNING,
1865 "warning: checktime reached, "
1866 "running e2fsck is recommended");
1867 if (!sbi->s_journal)
1868 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1869 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1870 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1871 le16_add_cpu(&es->s_mnt_count, 1);
1872 es->s_mtime = cpu_to_le32(get_seconds());
1873 ext4_update_dynamic_rev(sb);
1875 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1877 ext4_commit_super(sb, 1);
1878 if (test_opt(sb, DEBUG))
1879 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1880 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1882 sbi->s_groups_count,
1883 EXT4_BLOCKS_PER_GROUP(sb),
1884 EXT4_INODES_PER_GROUP(sb),
1890 static int ext4_fill_flex_info(struct super_block *sb)
1892 struct ext4_sb_info *sbi = EXT4_SB(sb);
1893 struct ext4_group_desc *gdp = NULL;
1894 ext4_group_t flex_group_count;
1895 ext4_group_t flex_group;
1896 int groups_per_flex = 0;
1900 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1901 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1903 if (groups_per_flex < 2) {
1904 sbi->s_log_groups_per_flex = 0;
1908 /* We allocate both existing and potentially added groups */
1909 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1910 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1911 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1912 size = flex_group_count * sizeof(struct flex_groups);
1913 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1914 if (sbi->s_flex_groups == NULL) {
1915 sbi->s_flex_groups = vmalloc(size);
1916 if (sbi->s_flex_groups)
1917 memset(sbi->s_flex_groups, 0, size);
1919 if (sbi->s_flex_groups == NULL) {
1920 ext4_msg(sb, KERN_ERR, "not enough memory for "
1921 "%u flex groups", flex_group_count);
1925 for (i = 0; i < sbi->s_groups_count; i++) {
1926 gdp = ext4_get_group_desc(sb, i, NULL);
1928 flex_group = ext4_flex_group(sbi, i);
1929 atomic_add(ext4_free_inodes_count(sb, gdp),
1930 &sbi->s_flex_groups[flex_group].free_inodes);
1931 atomic_add(ext4_free_blks_count(sb, gdp),
1932 &sbi->s_flex_groups[flex_group].free_blocks);
1933 atomic_add(ext4_used_dirs_count(sb, gdp),
1934 &sbi->s_flex_groups[flex_group].used_dirs);
1942 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1943 struct ext4_group_desc *gdp)
1947 if (sbi->s_es->s_feature_ro_compat &
1948 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1949 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1950 __le32 le_group = cpu_to_le32(block_group);
1952 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1953 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1954 crc = crc16(crc, (__u8 *)gdp, offset);
1955 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1956 /* for checksum of struct ext4_group_desc do the rest...*/
1957 if ((sbi->s_es->s_feature_incompat &
1958 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1959 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1960 crc = crc16(crc, (__u8 *)gdp + offset,
1961 le16_to_cpu(sbi->s_es->s_desc_size) -
1965 return cpu_to_le16(crc);
1968 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1969 struct ext4_group_desc *gdp)
1971 if ((sbi->s_es->s_feature_ro_compat &
1972 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1973 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1979 /* Called at mount-time, super-block is locked */
1980 static int ext4_check_descriptors(struct super_block *sb,
1981 ext4_group_t *first_not_zeroed)
1983 struct ext4_sb_info *sbi = EXT4_SB(sb);
1984 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1985 ext4_fsblk_t last_block;
1986 ext4_fsblk_t block_bitmap;
1987 ext4_fsblk_t inode_bitmap;
1988 ext4_fsblk_t inode_table;
1989 int flexbg_flag = 0;
1990 ext4_group_t i, grp = sbi->s_groups_count;
1992 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1995 ext4_debug("Checking group descriptors");
1997 for (i = 0; i < sbi->s_groups_count; i++) {
1998 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2000 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2001 last_block = ext4_blocks_count(sbi->s_es) - 1;
2003 last_block = first_block +
2004 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2006 if ((grp == sbi->s_groups_count) &&
2007 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2010 block_bitmap = ext4_block_bitmap(sb, gdp);
2011 if (block_bitmap < first_block || block_bitmap > last_block) {
2012 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2013 "Block bitmap for group %u not in group "
2014 "(block %llu)!", i, block_bitmap);
2017 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2018 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2019 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2020 "Inode bitmap for group %u not in group "
2021 "(block %llu)!", i, inode_bitmap);
2024 inode_table = ext4_inode_table(sb, gdp);
2025 if (inode_table < first_block ||
2026 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2027 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2028 "Inode table for group %u not in group "
2029 "(block %llu)!", i, inode_table);
2032 ext4_lock_group(sb, i);
2033 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
2034 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2035 "Checksum for group %u failed (%u!=%u)",
2036 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2037 gdp)), le16_to_cpu(gdp->bg_checksum));
2038 if (!(sb->s_flags & MS_RDONLY)) {
2039 ext4_unlock_group(sb, i);
2043 ext4_unlock_group(sb, i);
2045 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2047 if (NULL != first_not_zeroed)
2048 *first_not_zeroed = grp;
2050 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2051 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2055 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2056 * the superblock) which were deleted from all directories, but held open by
2057 * a process at the time of a crash. We walk the list and try to delete these
2058 * inodes at recovery time (only with a read-write filesystem).
2060 * In order to keep the orphan inode chain consistent during traversal (in
2061 * case of crash during recovery), we link each inode into the superblock
2062 * orphan list_head and handle it the same way as an inode deletion during
2063 * normal operation (which journals the operations for us).
2065 * We only do an iget() and an iput() on each inode, which is very safe if we
2066 * accidentally point at an in-use or already deleted inode. The worst that
2067 * can happen in this case is that we get a "bit already cleared" message from
2068 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2069 * e2fsck was run on this filesystem, and it must have already done the orphan
2070 * inode cleanup for us, so we can safely abort without any further action.
2072 static void ext4_orphan_cleanup(struct super_block *sb,
2073 struct ext4_super_block *es)
2075 unsigned int s_flags = sb->s_flags;
2076 int nr_orphans = 0, nr_truncates = 0;
2080 if (!es->s_last_orphan) {
2081 jbd_debug(4, "no orphan inodes to clean up\n");
2085 if (bdev_read_only(sb->s_bdev)) {
2086 ext4_msg(sb, KERN_ERR, "write access "
2087 "unavailable, skipping orphan cleanup");
2091 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2092 if (es->s_last_orphan)
2093 jbd_debug(1, "Errors on filesystem, "
2094 "clearing orphan list.\n");
2095 es->s_last_orphan = 0;
2096 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2100 if (s_flags & MS_RDONLY) {
2101 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2102 sb->s_flags &= ~MS_RDONLY;
2105 /* Needed for iput() to work correctly and not trash data */
2106 sb->s_flags |= MS_ACTIVE;
2107 /* Turn on quotas so that they are updated correctly */
2108 for (i = 0; i < MAXQUOTAS; i++) {
2109 if (EXT4_SB(sb)->s_qf_names[i]) {
2110 int ret = ext4_quota_on_mount(sb, i);
2112 ext4_msg(sb, KERN_ERR,
2113 "Cannot turn on journaled "
2114 "quota: error %d", ret);
2119 while (es->s_last_orphan) {
2120 struct inode *inode;
2122 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2123 if (IS_ERR(inode)) {
2124 es->s_last_orphan = 0;
2128 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2129 dquot_initialize(inode);
2130 if (inode->i_nlink) {
2131 ext4_msg(sb, KERN_DEBUG,
2132 "%s: truncating inode %lu to %lld bytes",
2133 __func__, inode->i_ino, inode->i_size);
2134 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2135 inode->i_ino, inode->i_size);
2136 ext4_truncate(inode);
2139 ext4_msg(sb, KERN_DEBUG,
2140 "%s: deleting unreferenced inode %lu",
2141 __func__, inode->i_ino);
2142 jbd_debug(2, "deleting unreferenced inode %lu\n",
2146 iput(inode); /* The delete magic happens here! */
2149 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2152 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2153 PLURAL(nr_orphans));
2155 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2156 PLURAL(nr_truncates));
2158 /* Turn quotas off */
2159 for (i = 0; i < MAXQUOTAS; i++) {
2160 if (sb_dqopt(sb)->files[i])
2161 dquot_quota_off(sb, i);
2164 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2168 * Maximal extent format file size.
2169 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2170 * extent format containers, within a sector_t, and within i_blocks
2171 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2172 * so that won't be a limiting factor.
2174 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2176 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2179 loff_t upper_limit = MAX_LFS_FILESIZE;
2181 /* small i_blocks in vfs inode? */
2182 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2184 * CONFIG_LBDAF is not enabled implies the inode
2185 * i_block represent total blocks in 512 bytes
2186 * 32 == size of vfs inode i_blocks * 8
2188 upper_limit = (1LL << 32) - 1;
2190 /* total blocks in file system block size */
2191 upper_limit >>= (blkbits - 9);
2192 upper_limit <<= blkbits;
2195 /* 32-bit extent-start container, ee_block */
2200 /* Sanity check against vm- & vfs- imposed limits */
2201 if (res > upper_limit)
2208 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2209 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2210 * We need to be 1 filesystem block less than the 2^48 sector limit.
2212 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2214 loff_t res = EXT4_NDIR_BLOCKS;
2217 /* This is calculated to be the largest file size for a dense, block
2218 * mapped file such that the file's total number of 512-byte sectors,
2219 * including data and all indirect blocks, does not exceed (2^48 - 1).
2221 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2222 * number of 512-byte sectors of the file.
2225 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2227 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2228 * the inode i_block field represents total file blocks in
2229 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2231 upper_limit = (1LL << 32) - 1;
2233 /* total blocks in file system block size */
2234 upper_limit >>= (bits - 9);
2238 * We use 48 bit ext4_inode i_blocks
2239 * With EXT4_HUGE_FILE_FL set the i_blocks
2240 * represent total number of blocks in
2241 * file system block size
2243 upper_limit = (1LL << 48) - 1;
2247 /* indirect blocks */
2249 /* double indirect blocks */
2250 meta_blocks += 1 + (1LL << (bits-2));
2251 /* tripple indirect blocks */
2252 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2254 upper_limit -= meta_blocks;
2255 upper_limit <<= bits;
2257 res += 1LL << (bits-2);
2258 res += 1LL << (2*(bits-2));
2259 res += 1LL << (3*(bits-2));
2261 if (res > upper_limit)
2264 if (res > MAX_LFS_FILESIZE)
2265 res = MAX_LFS_FILESIZE;
2270 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2271 ext4_fsblk_t logical_sb_block, int nr)
2273 struct ext4_sb_info *sbi = EXT4_SB(sb);
2274 ext4_group_t bg, first_meta_bg;
2277 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2279 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2281 return logical_sb_block + nr + 1;
2282 bg = sbi->s_desc_per_block * nr;
2283 if (ext4_bg_has_super(sb, bg))
2286 return (has_super + ext4_group_first_block_no(sb, bg));
2290 * ext4_get_stripe_size: Get the stripe size.
2291 * @sbi: In memory super block info
2293 * If we have specified it via mount option, then
2294 * use the mount option value. If the value specified at mount time is
2295 * greater than the blocks per group use the super block value.
2296 * If the super block value is greater than blocks per group return 0.
2297 * Allocator needs it be less than blocks per group.
2300 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2302 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2303 unsigned long stripe_width =
2304 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2306 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2307 return sbi->s_stripe;
2309 if (stripe_width <= sbi->s_blocks_per_group)
2310 return stripe_width;
2312 if (stride <= sbi->s_blocks_per_group)
2321 struct attribute attr;
2322 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2323 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2324 const char *, size_t);
2328 static int parse_strtoul(const char *buf,
2329 unsigned long max, unsigned long *value)
2333 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2334 endp = skip_spaces(endp);
2335 if (*endp || *value > max)
2341 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2342 struct ext4_sb_info *sbi,
2345 return snprintf(buf, PAGE_SIZE, "%llu\n",
2346 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2349 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2350 struct ext4_sb_info *sbi, char *buf)
2352 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2354 if (!sb->s_bdev->bd_part)
2355 return snprintf(buf, PAGE_SIZE, "0\n");
2356 return snprintf(buf, PAGE_SIZE, "%lu\n",
2357 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2358 sbi->s_sectors_written_start) >> 1);
2361 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2362 struct ext4_sb_info *sbi, char *buf)
2364 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2366 if (!sb->s_bdev->bd_part)
2367 return snprintf(buf, PAGE_SIZE, "0\n");
2368 return snprintf(buf, PAGE_SIZE, "%llu\n",
2369 (unsigned long long)(sbi->s_kbytes_written +
2370 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2371 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2374 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2375 struct ext4_sb_info *sbi,
2376 const char *buf, size_t count)
2380 if (parse_strtoul(buf, 0x40000000, &t))
2383 if (!is_power_of_2(t))
2386 sbi->s_inode_readahead_blks = t;
2390 static ssize_t sbi_ui_show(struct ext4_attr *a,
2391 struct ext4_sb_info *sbi, char *buf)
2393 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2395 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2398 static ssize_t sbi_ui_store(struct ext4_attr *a,
2399 struct ext4_sb_info *sbi,
2400 const char *buf, size_t count)
2402 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2405 if (parse_strtoul(buf, 0xffffffff, &t))
2411 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2412 static struct ext4_attr ext4_attr_##_name = { \
2413 .attr = {.name = __stringify(_name), .mode = _mode }, \
2416 .offset = offsetof(struct ext4_sb_info, _elname), \
2418 #define EXT4_ATTR(name, mode, show, store) \
2419 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2421 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2422 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2423 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2424 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2425 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2426 #define ATTR_LIST(name) &ext4_attr_##name.attr
2428 EXT4_RO_ATTR(delayed_allocation_blocks);
2429 EXT4_RO_ATTR(session_write_kbytes);
2430 EXT4_RO_ATTR(lifetime_write_kbytes);
2431 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2432 inode_readahead_blks_store, s_inode_readahead_blks);
2433 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2434 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2435 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2436 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2437 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2438 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2439 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2440 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2442 static struct attribute *ext4_attrs[] = {
2443 ATTR_LIST(delayed_allocation_blocks),
2444 ATTR_LIST(session_write_kbytes),
2445 ATTR_LIST(lifetime_write_kbytes),
2446 ATTR_LIST(inode_readahead_blks),
2447 ATTR_LIST(inode_goal),
2448 ATTR_LIST(mb_stats),
2449 ATTR_LIST(mb_max_to_scan),
2450 ATTR_LIST(mb_min_to_scan),
2451 ATTR_LIST(mb_order2_req),
2452 ATTR_LIST(mb_stream_req),
2453 ATTR_LIST(mb_group_prealloc),
2454 ATTR_LIST(max_writeback_mb_bump),
2458 /* Features this copy of ext4 supports */
2459 EXT4_INFO_ATTR(lazy_itable_init);
2461 static struct attribute *ext4_feat_attrs[] = {
2462 ATTR_LIST(lazy_itable_init),
2466 static ssize_t ext4_attr_show(struct kobject *kobj,
2467 struct attribute *attr, char *buf)
2469 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2471 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2473 return a->show ? a->show(a, sbi, buf) : 0;
2476 static ssize_t ext4_attr_store(struct kobject *kobj,
2477 struct attribute *attr,
2478 const char *buf, size_t len)
2480 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2482 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2484 return a->store ? a->store(a, sbi, buf, len) : 0;
2487 static void ext4_sb_release(struct kobject *kobj)
2489 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2491 complete(&sbi->s_kobj_unregister);
2494 static const struct sysfs_ops ext4_attr_ops = {
2495 .show = ext4_attr_show,
2496 .store = ext4_attr_store,
2499 static struct kobj_type ext4_ktype = {
2500 .default_attrs = ext4_attrs,
2501 .sysfs_ops = &ext4_attr_ops,
2502 .release = ext4_sb_release,
2505 static void ext4_feat_release(struct kobject *kobj)
2507 complete(&ext4_feat->f_kobj_unregister);
2510 static struct kobj_type ext4_feat_ktype = {
2511 .default_attrs = ext4_feat_attrs,
2512 .sysfs_ops = &ext4_attr_ops,
2513 .release = ext4_feat_release,
2517 * Check whether this filesystem can be mounted based on
2518 * the features present and the RDONLY/RDWR mount requested.
2519 * Returns 1 if this filesystem can be mounted as requested,
2520 * 0 if it cannot be.
2522 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2524 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2525 ext4_msg(sb, KERN_ERR,
2526 "Couldn't mount because of "
2527 "unsupported optional features (%x)",
2528 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2529 ~EXT4_FEATURE_INCOMPAT_SUPP));
2536 /* Check that feature set is OK for a read-write mount */
2537 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2538 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2539 "unsupported optional features (%x)",
2540 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2541 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2545 * Large file size enabled file system can only be mounted
2546 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2548 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2549 if (sizeof(blkcnt_t) < sizeof(u64)) {
2550 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2551 "cannot be mounted RDWR without "
2560 * This function is called once a day if we have errors logged
2561 * on the file system
2563 static void print_daily_error_info(unsigned long arg)
2565 struct super_block *sb = (struct super_block *) arg;
2566 struct ext4_sb_info *sbi;
2567 struct ext4_super_block *es;
2572 if (es->s_error_count)
2573 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2574 le32_to_cpu(es->s_error_count));
2575 if (es->s_first_error_time) {
2576 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2577 sb->s_id, le32_to_cpu(es->s_first_error_time),
2578 (int) sizeof(es->s_first_error_func),
2579 es->s_first_error_func,
2580 le32_to_cpu(es->s_first_error_line));
2581 if (es->s_first_error_ino)
2582 printk(": inode %u",
2583 le32_to_cpu(es->s_first_error_ino));
2584 if (es->s_first_error_block)
2585 printk(": block %llu", (unsigned long long)
2586 le64_to_cpu(es->s_first_error_block));
2589 if (es->s_last_error_time) {
2590 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2591 sb->s_id, le32_to_cpu(es->s_last_error_time),
2592 (int) sizeof(es->s_last_error_func),
2593 es->s_last_error_func,
2594 le32_to_cpu(es->s_last_error_line));
2595 if (es->s_last_error_ino)
2596 printk(": inode %u",
2597 le32_to_cpu(es->s_last_error_ino));
2598 if (es->s_last_error_block)
2599 printk(": block %llu", (unsigned long long)
2600 le64_to_cpu(es->s_last_error_block));
2603 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2606 static void ext4_lazyinode_timeout(unsigned long data)
2608 struct task_struct *p = (struct task_struct *)data;
2612 /* Find next suitable group and run ext4_init_inode_table */
2613 static int ext4_run_li_request(struct ext4_li_request *elr)
2615 struct ext4_group_desc *gdp = NULL;
2616 ext4_group_t group, ngroups;
2617 struct super_block *sb;
2618 unsigned long timeout = 0;
2622 ngroups = EXT4_SB(sb)->s_groups_count;
2624 for (group = elr->lr_next_group; group < ngroups; group++) {
2625 gdp = ext4_get_group_desc(sb, group, NULL);
2631 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2635 if (group == ngroups)
2640 ret = ext4_init_inode_table(sb, group,
2641 elr->lr_timeout ? 0 : 1);
2642 if (elr->lr_timeout == 0) {
2643 timeout = jiffies - timeout;
2644 if (elr->lr_sbi->s_li_wait_mult)
2645 timeout *= elr->lr_sbi->s_li_wait_mult;
2648 elr->lr_timeout = timeout;
2650 elr->lr_next_sched = jiffies + elr->lr_timeout;
2651 elr->lr_next_group = group + 1;
2658 * Remove lr_request from the list_request and free the
2659 * request tructure. Should be called with li_list_mtx held
2661 static void ext4_remove_li_request(struct ext4_li_request *elr)
2663 struct ext4_sb_info *sbi;
2670 list_del(&elr->lr_request);
2671 sbi->s_li_request = NULL;
2675 static void ext4_unregister_li_request(struct super_block *sb)
2677 struct ext4_li_request *elr = EXT4_SB(sb)->s_li_request;
2682 mutex_lock(&ext4_li_info->li_list_mtx);
2683 ext4_remove_li_request(elr);
2684 mutex_unlock(&ext4_li_info->li_list_mtx);
2688 * This is the function where ext4lazyinit thread lives. It walks
2689 * through the request list searching for next scheduled filesystem.
2690 * When such a fs is found, run the lazy initialization request
2691 * (ext4_rn_li_request) and keep track of the time spend in this
2692 * function. Based on that time we compute next schedule time of
2693 * the request. When walking through the list is complete, compute
2694 * next waking time and put itself into sleep.
2696 static int ext4_lazyinit_thread(void *arg)
2698 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2699 struct list_head *pos, *n;
2700 struct ext4_li_request *elr;
2701 unsigned long next_wakeup;
2705 BUG_ON(NULL == eli);
2707 eli->li_timer.data = (unsigned long)current;
2708 eli->li_timer.function = ext4_lazyinode_timeout;
2710 eli->li_task = current;
2711 wake_up(&eli->li_wait_task);
2715 next_wakeup = MAX_JIFFY_OFFSET;
2717 mutex_lock(&eli->li_list_mtx);
2718 if (list_empty(&eli->li_request_list)) {
2719 mutex_unlock(&eli->li_list_mtx);
2723 list_for_each_safe(pos, n, &eli->li_request_list) {
2724 elr = list_entry(pos, struct ext4_li_request,
2727 if (time_after_eq(jiffies, elr->lr_next_sched))
2728 ret = ext4_run_li_request(elr);
2732 ext4_remove_li_request(elr);
2736 if (time_before(elr->lr_next_sched, next_wakeup))
2737 next_wakeup = elr->lr_next_sched;
2739 mutex_unlock(&eli->li_list_mtx);
2741 if (freezing(current))
2744 if (time_after_eq(jiffies, next_wakeup)) {
2749 eli->li_timer.expires = next_wakeup;
2750 add_timer(&eli->li_timer);
2751 prepare_to_wait(&eli->li_wait_daemon, &wait,
2752 TASK_INTERRUPTIBLE);
2753 if (time_before(jiffies, next_wakeup))
2755 finish_wait(&eli->li_wait_daemon, &wait);
2760 * It looks like the request list is empty, but we need
2761 * to check it under the li_list_mtx lock, to prevent any
2762 * additions into it, and of course we should lock ext4_li_mtx
2763 * to atomically free the list and ext4_li_info, because at
2764 * this point another ext4 filesystem could be registering
2767 mutex_lock(&ext4_li_mtx);
2768 mutex_lock(&eli->li_list_mtx);
2769 if (!list_empty(&eli->li_request_list)) {
2770 mutex_unlock(&eli->li_list_mtx);
2771 mutex_unlock(&ext4_li_mtx);
2774 mutex_unlock(&eli->li_list_mtx);
2775 del_timer_sync(&ext4_li_info->li_timer);
2776 eli->li_task = NULL;
2777 wake_up(&eli->li_wait_task);
2779 kfree(ext4_li_info);
2780 ext4_li_info = NULL;
2781 mutex_unlock(&ext4_li_mtx);
2786 static void ext4_clear_request_list(void)
2788 struct list_head *pos, *n;
2789 struct ext4_li_request *elr;
2791 mutex_lock(&ext4_li_info->li_list_mtx);
2792 if (list_empty(&ext4_li_info->li_request_list))
2795 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2796 elr = list_entry(pos, struct ext4_li_request,
2798 ext4_remove_li_request(elr);
2800 mutex_unlock(&ext4_li_info->li_list_mtx);
2803 static int ext4_run_lazyinit_thread(void)
2805 struct task_struct *t;
2807 t = kthread_run(ext4_lazyinit_thread, ext4_li_info, "ext4lazyinit");
2809 int err = PTR_ERR(t);
2810 ext4_clear_request_list();
2811 del_timer_sync(&ext4_li_info->li_timer);
2812 kfree(ext4_li_info);
2813 ext4_li_info = NULL;
2814 printk(KERN_CRIT "EXT4: error %d creating inode table "
2815 "initialization thread\n",
2819 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2821 wait_event(ext4_li_info->li_wait_task, ext4_li_info->li_task != NULL);
2826 * Check whether it make sense to run itable init. thread or not.
2827 * If there is at least one uninitialized inode table, return
2828 * corresponding group number, else the loop goes through all
2829 * groups and return total number of groups.
2831 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2833 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2834 struct ext4_group_desc *gdp = NULL;
2836 for (group = 0; group < ngroups; group++) {
2837 gdp = ext4_get_group_desc(sb, group, NULL);
2841 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2848 static int ext4_li_info_new(void)
2850 struct ext4_lazy_init *eli = NULL;
2852 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2856 eli->li_task = NULL;
2857 INIT_LIST_HEAD(&eli->li_request_list);
2858 mutex_init(&eli->li_list_mtx);
2860 init_waitqueue_head(&eli->li_wait_daemon);
2861 init_waitqueue_head(&eli->li_wait_task);
2862 init_timer(&eli->li_timer);
2863 eli->li_state |= EXT4_LAZYINIT_QUIT;
2870 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2873 struct ext4_sb_info *sbi = EXT4_SB(sb);
2874 struct ext4_li_request *elr;
2877 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2883 elr->lr_next_group = start;
2886 * Randomize first schedule time of the request to
2887 * spread the inode table initialization requests
2890 get_random_bytes(&rnd, sizeof(rnd));
2891 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2892 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2897 static int ext4_register_li_request(struct super_block *sb,
2898 ext4_group_t first_not_zeroed)
2900 struct ext4_sb_info *sbi = EXT4_SB(sb);
2901 struct ext4_li_request *elr;
2902 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2905 if (sbi->s_li_request != NULL)
2908 if (first_not_zeroed == ngroups ||
2909 (sb->s_flags & MS_RDONLY) ||
2910 !test_opt(sb, INIT_INODE_TABLE)) {
2911 sbi->s_li_request = NULL;
2915 if (first_not_zeroed == ngroups) {
2916 sbi->s_li_request = NULL;
2920 elr = ext4_li_request_new(sb, first_not_zeroed);
2926 mutex_lock(&ext4_li_mtx);
2928 if (NULL == ext4_li_info) {
2929 ret = ext4_li_info_new();
2934 mutex_lock(&ext4_li_info->li_list_mtx);
2935 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2936 mutex_unlock(&ext4_li_info->li_list_mtx);
2938 sbi->s_li_request = elr;
2940 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2941 ret = ext4_run_lazyinit_thread();
2946 mutex_unlock(&ext4_li_mtx);
2950 mutex_unlock(&ext4_li_mtx);
2957 * We do not need to lock anything since this is called on
2960 static void ext4_destroy_lazyinit_thread(void)
2963 * If thread exited earlier
2964 * there's nothing to be done.
2969 ext4_clear_request_list();
2971 while (ext4_li_info->li_task) {
2972 wake_up(&ext4_li_info->li_wait_daemon);
2973 wait_event(ext4_li_info->li_wait_task,
2974 ext4_li_info->li_task == NULL);
2978 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2979 __releases(kernel_lock)
2980 __acquires(kernel_lock)
2982 char *orig_data = kstrdup(data, GFP_KERNEL);
2983 struct buffer_head *bh;
2984 struct ext4_super_block *es = NULL;
2985 struct ext4_sb_info *sbi;
2987 ext4_fsblk_t sb_block = get_sb_block(&data);
2988 ext4_fsblk_t logical_sb_block;
2989 unsigned long offset = 0;
2990 unsigned long journal_devnum = 0;
2991 unsigned long def_mount_opts;
2997 unsigned int db_count;
2999 int needs_recovery, has_huge_files;
3002 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3003 ext4_group_t first_not_zeroed;
3005 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3009 sbi->s_blockgroup_lock =
3010 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3011 if (!sbi->s_blockgroup_lock) {
3015 sb->s_fs_info = sbi;
3016 sbi->s_mount_opt = 0;
3017 sbi->s_resuid = EXT4_DEF_RESUID;
3018 sbi->s_resgid = EXT4_DEF_RESGID;
3019 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3020 sbi->s_sb_block = sb_block;
3021 if (sb->s_bdev->bd_part)
3022 sbi->s_sectors_written_start =
3023 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3027 /* Cleanup superblock name */
3028 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3032 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3034 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3039 * The ext4 superblock will not be buffer aligned for other than 1kB
3040 * block sizes. We need to calculate the offset from buffer start.
3042 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3043 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3044 offset = do_div(logical_sb_block, blocksize);
3046 logical_sb_block = sb_block;
3049 if (!(bh = sb_bread(sb, logical_sb_block))) {
3050 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3054 * Note: s_es must be initialized as soon as possible because
3055 * some ext4 macro-instructions depend on its value
3057 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3059 sb->s_magic = le16_to_cpu(es->s_magic);
3060 if (sb->s_magic != EXT4_SUPER_MAGIC)
3062 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3064 /* Set defaults before we parse the mount options */
3065 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3066 set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
3067 if (def_mount_opts & EXT4_DEFM_DEBUG)
3068 set_opt(sbi->s_mount_opt, DEBUG);
3069 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
3070 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
3072 set_opt(sbi->s_mount_opt, GRPID);
3074 if (def_mount_opts & EXT4_DEFM_UID16)
3075 set_opt(sbi->s_mount_opt, NO_UID32);
3076 #ifdef CONFIG_EXT4_FS_XATTR
3077 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
3078 set_opt(sbi->s_mount_opt, XATTR_USER);
3080 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3081 if (def_mount_opts & EXT4_DEFM_ACL)
3082 set_opt(sbi->s_mount_opt, POSIX_ACL);
3084 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3085 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
3086 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3087 set_opt(sbi->s_mount_opt, ORDERED_DATA);
3088 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3089 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
3091 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3092 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
3093 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3094 set_opt(sbi->s_mount_opt, ERRORS_CONT);
3096 set_opt(sbi->s_mount_opt, ERRORS_RO);
3097 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3098 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
3099 if (def_mount_opts & EXT4_DEFM_DISCARD)
3100 set_opt(sbi->s_mount_opt, DISCARD);
3102 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3103 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
3104 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3105 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3106 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3108 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3109 set_opt(sbi->s_mount_opt, BARRIER);
3112 * enable delayed allocation by default
3113 * Use -o nodelalloc to turn it off
3115 if (!IS_EXT3_SB(sb) &&
3116 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3117 set_opt(sbi->s_mount_opt, DELALLOC);
3119 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3120 &journal_devnum, &journal_ioprio, NULL, 0)) {
3121 ext4_msg(sb, KERN_WARNING,
3122 "failed to parse options in superblock: %s",
3123 sbi->s_es->s_mount_opts);
3125 if (!parse_options((char *) data, sb, &journal_devnum,
3126 &journal_ioprio, NULL, 0))
3129 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3130 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3132 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3133 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3134 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3135 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3136 ext4_msg(sb, KERN_WARNING,
3137 "feature flags set on rev 0 fs, "
3138 "running e2fsck is recommended");
3141 * Check feature flags regardless of the revision level, since we
3142 * previously didn't change the revision level when setting the flags,
3143 * so there is a chance incompat flags are set on a rev 0 filesystem.
3145 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3148 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3150 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3151 blocksize > EXT4_MAX_BLOCK_SIZE) {
3152 ext4_msg(sb, KERN_ERR,
3153 "Unsupported filesystem blocksize %d", blocksize);
3157 if (sb->s_blocksize != blocksize) {
3158 /* Validate the filesystem blocksize */
3159 if (!sb_set_blocksize(sb, blocksize)) {
3160 ext4_msg(sb, KERN_ERR, "bad block size %d",
3166 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3167 offset = do_div(logical_sb_block, blocksize);
3168 bh = sb_bread(sb, logical_sb_block);
3170 ext4_msg(sb, KERN_ERR,
3171 "Can't read superblock on 2nd try");
3174 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
3176 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3177 ext4_msg(sb, KERN_ERR,
3178 "Magic mismatch, very weird!");
3183 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3184 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3185 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3187 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3189 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3190 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3191 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3193 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3194 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3195 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3196 (!is_power_of_2(sbi->s_inode_size)) ||
3197 (sbi->s_inode_size > blocksize)) {
3198 ext4_msg(sb, KERN_ERR,
3199 "unsupported inode size: %d",
3203 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3204 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3207 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3208 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3209 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3210 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3211 !is_power_of_2(sbi->s_desc_size)) {
3212 ext4_msg(sb, KERN_ERR,
3213 "unsupported descriptor size %lu",
3218 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3220 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3221 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3222 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3225 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3226 if (sbi->s_inodes_per_block == 0)
3228 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3229 sbi->s_inodes_per_block;
3230 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3232 sbi->s_mount_state = le16_to_cpu(es->s_state);
3233 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3234 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3236 for (i = 0; i < 4; i++)
3237 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3238 sbi->s_def_hash_version = es->s_def_hash_version;
3239 i = le32_to_cpu(es->s_flags);
3240 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3241 sbi->s_hash_unsigned = 3;
3242 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3243 #ifdef __CHAR_UNSIGNED__
3244 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3245 sbi->s_hash_unsigned = 3;
3247 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3252 if (sbi->s_blocks_per_group > blocksize * 8) {
3253 ext4_msg(sb, KERN_ERR,
3254 "#blocks per group too big: %lu",
3255 sbi->s_blocks_per_group);
3258 if (sbi->s_inodes_per_group > blocksize * 8) {
3259 ext4_msg(sb, KERN_ERR,
3260 "#inodes per group too big: %lu",
3261 sbi->s_inodes_per_group);
3266 * Test whether we have more sectors than will fit in sector_t,
3267 * and whether the max offset is addressable by the page cache.
3269 if ((ext4_blocks_count(es) >
3270 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) ||
3271 (ext4_blocks_count(es) >
3272 (pgoff_t)(~0ULL) >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits))) {
3273 ext4_msg(sb, KERN_ERR, "filesystem"
3274 " too large to mount safely on this system");
3275 if (sizeof(sector_t) < 8)
3276 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3281 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3284 /* check blocks count against device size */
3285 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3286 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3287 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3288 "exceeds size of device (%llu blocks)",
3289 ext4_blocks_count(es), blocks_count);
3294 * It makes no sense for the first data block to be beyond the end
3295 * of the filesystem.
3297 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3298 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
3299 "block %u is beyond end of filesystem (%llu)",
3300 le32_to_cpu(es->s_first_data_block),
3301 ext4_blocks_count(es));
3304 blocks_count = (ext4_blocks_count(es) -
3305 le32_to_cpu(es->s_first_data_block) +
3306 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3307 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3308 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3309 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3310 "(block count %llu, first data block %u, "
3311 "blocks per group %lu)", sbi->s_groups_count,
3312 ext4_blocks_count(es),
3313 le32_to_cpu(es->s_first_data_block),
3314 EXT4_BLOCKS_PER_GROUP(sb));
3317 sbi->s_groups_count = blocks_count;
3318 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3319 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3320 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3321 EXT4_DESC_PER_BLOCK(sb);
3322 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
3324 if (sbi->s_group_desc == NULL) {
3325 ext4_msg(sb, KERN_ERR, "not enough memory");
3329 #ifdef CONFIG_PROC_FS
3331 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3334 bgl_lock_init(sbi->s_blockgroup_lock);
3336 for (i = 0; i < db_count; i++) {
3337 block = descriptor_loc(sb, logical_sb_block, i);
3338 sbi->s_group_desc[i] = sb_bread(sb, block);
3339 if (!sbi->s_group_desc[i]) {
3340 ext4_msg(sb, KERN_ERR,
3341 "can't read group descriptor %d", i);
3346 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3347 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3350 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3351 if (!ext4_fill_flex_info(sb)) {
3352 ext4_msg(sb, KERN_ERR,
3353 "unable to initialize "
3354 "flex_bg meta info!");
3358 sbi->s_gdb_count = db_count;
3359 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3360 spin_lock_init(&sbi->s_next_gen_lock);
3362 sbi->s_stripe = ext4_get_stripe_size(sbi);
3363 sbi->s_max_writeback_mb_bump = 128;
3366 * set up enough so that it can read an inode
3368 if (!test_opt(sb, NOLOAD) &&
3369 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3370 sb->s_op = &ext4_sops;
3372 sb->s_op = &ext4_nojournal_sops;
3373 sb->s_export_op = &ext4_export_ops;
3374 sb->s_xattr = ext4_xattr_handlers;
3376 sb->s_qcop = &ext4_qctl_operations;
3377 sb->dq_op = &ext4_quota_operations;
3379 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3380 mutex_init(&sbi->s_orphan_lock);
3381 mutex_init(&sbi->s_resize_lock);
3385 needs_recovery = (es->s_last_orphan != 0 ||
3386 EXT4_HAS_INCOMPAT_FEATURE(sb,
3387 EXT4_FEATURE_INCOMPAT_RECOVER));
3390 * The first inode we look at is the journal inode. Don't try
3391 * root first: it may be modified in the journal!
3393 if (!test_opt(sb, NOLOAD) &&
3394 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3395 if (ext4_load_journal(sb, es, journal_devnum))
3397 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3398 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3399 ext4_msg(sb, KERN_ERR, "required journal recovery "
3400 "suppressed and not mounted read-only");
3401 goto failed_mount_wq;
3403 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
3404 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
3405 sbi->s_journal = NULL;
3410 if (ext4_blocks_count(es) > 0xffffffffULL &&
3411 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3412 JBD2_FEATURE_INCOMPAT_64BIT)) {
3413 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3414 goto failed_mount_wq;
3417 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3418 jbd2_journal_set_features(sbi->s_journal,
3419 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3420 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3421 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3422 jbd2_journal_set_features(sbi->s_journal,
3423 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
3424 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3425 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3427 jbd2_journal_clear_features(sbi->s_journal,
3428 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3429 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3432 /* We have now updated the journal if required, so we can
3433 * validate the data journaling mode. */
3434 switch (test_opt(sb, DATA_FLAGS)) {
3436 /* No mode set, assume a default based on the journal
3437 * capabilities: ORDERED_DATA if the journal can
3438 * cope, else JOURNAL_DATA
3440 if (jbd2_journal_check_available_features
3441 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3442 set_opt(sbi->s_mount_opt, ORDERED_DATA);
3444 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
3447 case EXT4_MOUNT_ORDERED_DATA:
3448 case EXT4_MOUNT_WRITEBACK_DATA:
3449 if (!jbd2_journal_check_available_features
3450 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3451 ext4_msg(sb, KERN_ERR, "Journal does not support "
3452 "requested data journaling mode");
3453 goto failed_mount_wq;
3458 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3461 err = percpu_counter_init(&sbi->s_freeblocks_counter,
3462 ext4_count_free_blocks(sb));
3464 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3465 ext4_count_free_inodes(sb));
3467 err = percpu_counter_init(&sbi->s_dirs_counter,
3468 ext4_count_dirs(sb));
3470 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
3472 ext4_msg(sb, KERN_ERR, "insufficient memory");
3473 goto failed_mount_wq;
3476 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
3477 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3478 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3479 goto failed_mount_wq;
3483 * The jbd2_journal_load will have done any necessary log recovery,
3484 * so we can safely mount the rest of the filesystem now.
3487 root = ext4_iget(sb, EXT4_ROOT_INO);
3489 ext4_msg(sb, KERN_ERR, "get root inode failed");
3490 ret = PTR_ERR(root);
3493 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3495 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
3498 sb->s_root = d_alloc_root(root);
3500 ext4_msg(sb, KERN_ERR, "get root dentry failed");
3506 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
3508 /* determine the minimum size of new large inodes, if present */
3509 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3510 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3511 EXT4_GOOD_OLD_INODE_SIZE;
3512 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3513 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3514 if (sbi->s_want_extra_isize <
3515 le16_to_cpu(es->s_want_extra_isize))
3516 sbi->s_want_extra_isize =
3517 le16_to_cpu(es->s_want_extra_isize);
3518 if (sbi->s_want_extra_isize <
3519 le16_to_cpu(es->s_min_extra_isize))
3520 sbi->s_want_extra_isize =
3521 le16_to_cpu(es->s_min_extra_isize);
3524 /* Check if enough inode space is available */
3525 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3526 sbi->s_inode_size) {
3527 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3528 EXT4_GOOD_OLD_INODE_SIZE;
3529 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3533 if (test_opt(sb, DELALLOC) &&
3534 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
3535 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
3536 "requested data journaling mode");
3537 clear_opt(sbi->s_mount_opt, DELALLOC);
3539 if (test_opt(sb, DIOREAD_NOLOCK)) {
3540 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3541 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3542 "option - requested data journaling mode");
3543 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
3545 if (sb->s_blocksize < PAGE_SIZE) {
3546 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3547 "option - block size is too small");
3548 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
3552 err = ext4_setup_system_zone(sb);
3554 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3560 err = ext4_mb_init(sb, needs_recovery);
3562 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3567 err = ext4_register_li_request(sb, first_not_zeroed);
3571 sbi->s_kobj.kset = ext4_kset;
3572 init_completion(&sbi->s_kobj_unregister);
3573 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3576 ext4_mb_release(sb);
3577 ext4_ext_release(sb);
3581 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3582 ext4_orphan_cleanup(sb, es);
3583 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3584 if (needs_recovery) {
3585 ext4_msg(sb, KERN_INFO, "recovery complete");
3586 ext4_mark_recovery_complete(sb, es);
3588 if (EXT4_SB(sb)->s_journal) {
3589 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3590 descr = " journalled data mode";
3591 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3592 descr = " ordered data mode";
3594 descr = " writeback data mode";
3596 descr = "out journal";
3598 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3599 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3600 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
3602 init_timer(&sbi->s_err_report);
3603 sbi->s_err_report.function = print_daily_error_info;
3604 sbi->s_err_report.data = (unsigned long) sb;
3605 if (es->s_error_count)
3606 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3614 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
3618 ext4_msg(sb, KERN_ERR, "mount failed");
3619 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3621 ext4_release_system_zone(sb);
3622 if (sbi->s_journal) {
3623 jbd2_journal_destroy(sbi->s_journal);
3624 sbi->s_journal = NULL;
3626 percpu_counter_destroy(&sbi->s_freeblocks_counter);
3627 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3628 percpu_counter_destroy(&sbi->s_dirs_counter);
3629 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
3631 if (sbi->s_flex_groups) {
3632 if (is_vmalloc_addr(sbi->s_flex_groups))
3633 vfree(sbi->s_flex_groups);
3635 kfree(sbi->s_flex_groups);
3638 for (i = 0; i < db_count; i++)
3639 brelse(sbi->s_group_desc[i]);
3640 kfree(sbi->s_group_desc);
3643 remove_proc_entry(sb->s_id, ext4_proc_root);
3646 for (i = 0; i < MAXQUOTAS; i++)
3647 kfree(sbi->s_qf_names[i]);
3649 ext4_blkdev_remove(sbi);
3652 sb->s_fs_info = NULL;
3653 kfree(sbi->s_blockgroup_lock);
3662 * Setup any per-fs journal parameters now. We'll do this both on
3663 * initial mount, once the journal has been initialised but before we've
3664 * done any recovery; and again on any subsequent remount.
3666 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
3668 struct ext4_sb_info *sbi = EXT4_SB(sb);
3670 journal->j_commit_interval = sbi->s_commit_interval;
3671 journal->j_min_batch_time = sbi->s_min_batch_time;
3672 journal->j_max_batch_time = sbi->s_max_batch_time;
3674 write_lock(&journal->j_state_lock);
3675 if (test_opt(sb, BARRIER))
3676 journal->j_flags |= JBD2_BARRIER;
3678 journal->j_flags &= ~JBD2_BARRIER;
3679 if (test_opt(sb, DATA_ERR_ABORT))
3680 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3682 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
3683 write_unlock(&journal->j_state_lock);
3686 static journal_t *ext4_get_journal(struct super_block *sb,
3687 unsigned int journal_inum)
3689 struct inode *journal_inode;
3692 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3694 /* First, test for the existence of a valid inode on disk. Bad
3695 * things happen if we iget() an unused inode, as the subsequent
3696 * iput() will try to delete it. */
3698 journal_inode = ext4_iget(sb, journal_inum);
3699 if (IS_ERR(journal_inode)) {
3700 ext4_msg(sb, KERN_ERR, "no journal found");
3703 if (!journal_inode->i_nlink) {
3704 make_bad_inode(journal_inode);
3705 iput(journal_inode);
3706 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
3710 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3711 journal_inode, journal_inode->i_size);
3712 if (!S_ISREG(journal_inode->i_mode)) {
3713 ext4_msg(sb, KERN_ERR, "invalid journal inode");
3714 iput(journal_inode);
3718 journal = jbd2_journal_init_inode(journal_inode);
3720 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
3721 iput(journal_inode);
3724 journal->j_private = sb;
3725 ext4_init_journal_params(sb, journal);
3729 static journal_t *ext4_get_dev_journal(struct super_block *sb,
3732 struct buffer_head *bh;
3736 int hblock, blocksize;
3737 ext4_fsblk_t sb_block;
3738 unsigned long offset;
3739 struct ext4_super_block *es;
3740 struct block_device *bdev;
3742 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3744 bdev = ext4_blkdev_get(j_dev, sb);
3748 if (bd_claim(bdev, sb)) {
3749 ext4_msg(sb, KERN_ERR,
3750 "failed to claim external journal device");
3751 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
3755 blocksize = sb->s_blocksize;
3756 hblock = bdev_logical_block_size(bdev);
3757 if (blocksize < hblock) {
3758 ext4_msg(sb, KERN_ERR,
3759 "blocksize too small for journal device");
3763 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3764 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3765 set_blocksize(bdev, blocksize);
3766 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3767 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3768 "external journal");
3772 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3773 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
3774 !(le32_to_cpu(es->s_feature_incompat) &
3775 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3776 ext4_msg(sb, KERN_ERR, "external journal has "
3782 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3783 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
3788 len = ext4_blocks_count(es);
3789 start = sb_block + 1;
3790 brelse(bh); /* we're done with the superblock */
3792 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
3793 start, len, blocksize);
3795 ext4_msg(sb, KERN_ERR, "failed to create device journal");
3798 journal->j_private = sb;
3799 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3800 wait_on_buffer(journal->j_sb_buffer);
3801 if (!buffer_uptodate(journal->j_sb_buffer)) {
3802 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
3805 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
3806 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3807 "user (unsupported) - %d",
3808 be32_to_cpu(journal->j_superblock->s_nr_users));
3811 EXT4_SB(sb)->journal_bdev = bdev;
3812 ext4_init_journal_params(sb, journal);
3816 jbd2_journal_destroy(journal);
3818 ext4_blkdev_put(bdev);
3822 static int ext4_load_journal(struct super_block *sb,
3823 struct ext4_super_block *es,
3824 unsigned long journal_devnum)
3827 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3830 int really_read_only;
3832 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3834 if (journal_devnum &&
3835 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3836 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3837 "numbers have changed");
3838 journal_dev = new_decode_dev(journal_devnum);
3840 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3842 really_read_only = bdev_read_only(sb->s_bdev);
3845 * Are we loading a blank journal or performing recovery after a
3846 * crash? For recovery, we need to check in advance whether we
3847 * can get read-write access to the device.
3849 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3850 if (sb->s_flags & MS_RDONLY) {
3851 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3852 "required on readonly filesystem");
3853 if (really_read_only) {
3854 ext4_msg(sb, KERN_ERR, "write access "
3855 "unavailable, cannot proceed");
3858 ext4_msg(sb, KERN_INFO, "write access will "
3859 "be enabled during recovery");
3863 if (journal_inum && journal_dev) {
3864 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3865 "and inode journals!");
3870 if (!(journal = ext4_get_journal(sb, journal_inum)))
3873 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
3877 if (!(journal->j_flags & JBD2_BARRIER))
3878 ext4_msg(sb, KERN_INFO, "barriers disabled");
3880 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
3881 err = jbd2_journal_update_format(journal);
3883 ext4_msg(sb, KERN_ERR, "error updating journal");
3884 jbd2_journal_destroy(journal);
3889 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
3890 err = jbd2_journal_wipe(journal, !really_read_only);
3892 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
3894 memcpy(save, ((char *) es) +
3895 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
3896 err = jbd2_journal_load(journal);
3898 memcpy(((char *) es) + EXT4_S_ERR_START,
3899 save, EXT4_S_ERR_LEN);
3904 ext4_msg(sb, KERN_ERR, "error loading journal");
3905 jbd2_journal_destroy(journal);
3909 EXT4_SB(sb)->s_journal = journal;
3910 ext4_clear_journal_err(sb, es);
3912 if (!really_read_only && journal_devnum &&
3913 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3914 es->s_journal_dev = cpu_to_le32(journal_devnum);
3916 /* Make sure we flush the recovery flag to disk. */
3917 ext4_commit_super(sb, 1);
3923 static int ext4_commit_super(struct super_block *sb, int sync)
3925 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3926 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
3931 if (buffer_write_io_error(sbh)) {
3933 * Oh, dear. A previous attempt to write the
3934 * superblock failed. This could happen because the
3935 * USB device was yanked out. Or it could happen to
3936 * be a transient write error and maybe the block will
3937 * be remapped. Nothing we can do but to retry the
3938 * write and hope for the best.
3940 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3941 "superblock detected");
3942 clear_buffer_write_io_error(sbh);
3943 set_buffer_uptodate(sbh);
3946 * If the file system is mounted read-only, don't update the
3947 * superblock write time. This avoids updating the superblock
3948 * write time when we are mounting the root file system
3949 * read/only but we need to replay the journal; at that point,
3950 * for people who are east of GMT and who make their clock
3951 * tick in localtime for Windows bug-for-bug compatibility,
3952 * the clock is set in the future, and this will cause e2fsck
3953 * to complain and force a full file system check.
3955 if (!(sb->s_flags & MS_RDONLY))
3956 es->s_wtime = cpu_to_le32(get_seconds());
3957 if (sb->s_bdev->bd_part)
3958 es->s_kbytes_written =
3959 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3960 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3961 EXT4_SB(sb)->s_sectors_written_start) >> 1));
3963 es->s_kbytes_written =
3964 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
3965 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3966 &EXT4_SB(sb)->s_freeblocks_counter));
3967 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3968 &EXT4_SB(sb)->s_freeinodes_counter));
3970 BUFFER_TRACE(sbh, "marking dirty");
3971 mark_buffer_dirty(sbh);
3973 error = sync_dirty_buffer(sbh);
3977 error = buffer_write_io_error(sbh);
3979 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3981 clear_buffer_write_io_error(sbh);
3982 set_buffer_uptodate(sbh);
3989 * Have we just finished recovery? If so, and if we are mounting (or
3990 * remounting) the filesystem readonly, then we will end up with a
3991 * consistent fs on disk. Record that fact.
3993 static void ext4_mark_recovery_complete(struct super_block *sb,
3994 struct ext4_super_block *es)
3996 journal_t *journal = EXT4_SB(sb)->s_journal;
3998 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3999 BUG_ON(journal != NULL);
4002 jbd2_journal_lock_updates(journal);
4003 if (jbd2_journal_flush(journal) < 0)
4006 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4007 sb->s_flags & MS_RDONLY) {
4008 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4009 ext4_commit_super(sb, 1);
4013 jbd2_journal_unlock_updates(journal);
4017 * If we are mounting (or read-write remounting) a filesystem whose journal
4018 * has recorded an error from a previous lifetime, move that error to the
4019 * main filesystem now.
4021 static void ext4_clear_journal_err(struct super_block *sb,
4022 struct ext4_super_block *es)
4028 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4030 journal = EXT4_SB(sb)->s_journal;
4033 * Now check for any error status which may have been recorded in the
4034 * journal by a prior ext4_error() or ext4_abort()
4037 j_errno = jbd2_journal_errno(journal);
4041 errstr = ext4_decode_error(sb, j_errno, nbuf);
4042 ext4_warning(sb, "Filesystem error recorded "
4043 "from previous mount: %s", errstr);
4044 ext4_warning(sb, "Marking fs in need of filesystem check.");
4046 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4047 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4048 ext4_commit_super(sb, 1);
4050 jbd2_journal_clear_err(journal);
4055 * Force the running and committing transactions to commit,
4056 * and wait on the commit.
4058 int ext4_force_commit(struct super_block *sb)
4063 if (sb->s_flags & MS_RDONLY)
4066 journal = EXT4_SB(sb)->s_journal;
4068 vfs_check_frozen(sb, SB_FREEZE_TRANS);
4069 ret = ext4_journal_force_commit(journal);
4075 static void ext4_write_super(struct super_block *sb)
4078 ext4_commit_super(sb, 1);
4082 static int ext4_sync_fs(struct super_block *sb, int wait)
4086 struct ext4_sb_info *sbi = EXT4_SB(sb);
4088 trace_ext4_sync_fs(sb, wait);
4089 flush_workqueue(sbi->dio_unwritten_wq);
4090 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4092 jbd2_log_wait_commit(sbi->s_journal, target);
4098 * LVM calls this function before a (read-only) snapshot is created. This
4099 * gives us a chance to flush the journal completely and mark the fs clean.
4101 static int ext4_freeze(struct super_block *sb)
4106 if (sb->s_flags & MS_RDONLY)
4109 journal = EXT4_SB(sb)->s_journal;
4111 /* Now we set up the journal barrier. */
4112 jbd2_journal_lock_updates(journal);
4115 * Don't clear the needs_recovery flag if we failed to flush
4118 error = jbd2_journal_flush(journal);
4122 /* Journal blocked and flushed, clear needs_recovery flag. */
4123 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4124 error = ext4_commit_super(sb, 1);
4126 /* we rely on s_frozen to stop further updates */
4127 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4132 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4133 * flag here, even though the filesystem is not technically dirty yet.
4135 static int ext4_unfreeze(struct super_block *sb)
4137 if (sb->s_flags & MS_RDONLY)
4141 /* Reset the needs_recovery flag before the fs is unlocked. */
4142 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4143 ext4_commit_super(sb, 1);
4148 static int ext4_remount(struct super_block *sb, int *flags, char *data)
4150 struct ext4_super_block *es;
4151 struct ext4_sb_info *sbi = EXT4_SB(sb);
4152 ext4_fsblk_t n_blocks_count = 0;
4153 unsigned long old_sb_flags;
4154 struct ext4_mount_options old_opts;
4155 int enable_quota = 0;
4157 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4162 char *orig_data = kstrdup(data, GFP_KERNEL);
4166 /* Store the original options */
4168 old_sb_flags = sb->s_flags;
4169 old_opts.s_mount_opt = sbi->s_mount_opt;
4170 old_opts.s_resuid = sbi->s_resuid;
4171 old_opts.s_resgid = sbi->s_resgid;
4172 old_opts.s_commit_interval = sbi->s_commit_interval;
4173 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4174 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4176 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4177 for (i = 0; i < MAXQUOTAS; i++)
4178 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4180 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4181 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4184 * Allow the "check" option to be passed as a remount option.
4186 if (!parse_options(data, sb, NULL, &journal_ioprio,
4187 &n_blocks_count, 1)) {
4192 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4193 ext4_abort(sb, "Abort forced by user");
4195 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4196 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4200 if (sbi->s_journal) {
4201 ext4_init_journal_params(sb, sbi->s_journal);
4202 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4205 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
4206 n_blocks_count > ext4_blocks_count(es)) {
4207 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4212 if (*flags & MS_RDONLY) {
4213 err = dquot_suspend(sb, -1);
4218 * First of all, the unconditional stuff we have to do
4219 * to disable replay of the journal when we next remount
4221 sb->s_flags |= MS_RDONLY;
4224 * OK, test if we are remounting a valid rw partition
4225 * readonly, and if so set the rdonly flag and then
4226 * mark the partition as valid again.
4228 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4229 (sbi->s_mount_state & EXT4_VALID_FS))
4230 es->s_state = cpu_to_le16(sbi->s_mount_state);
4233 ext4_mark_recovery_complete(sb, es);
4235 /* Make sure we can mount this feature set readwrite */
4236 if (!ext4_feature_set_ok(sb, 0)) {
4241 * Make sure the group descriptor checksums
4242 * are sane. If they aren't, refuse to remount r/w.
4244 for (g = 0; g < sbi->s_groups_count; g++) {
4245 struct ext4_group_desc *gdp =
4246 ext4_get_group_desc(sb, g, NULL);
4248 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
4249 ext4_msg(sb, KERN_ERR,
4250 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4251 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4252 le16_to_cpu(gdp->bg_checksum));
4259 * If we have an unprocessed orphan list hanging
4260 * around from a previously readonly bdev mount,
4261 * require a full umount/remount for now.
4263 if (es->s_last_orphan) {
4264 ext4_msg(sb, KERN_WARNING, "Couldn't "
4265 "remount RDWR because of unprocessed "
4266 "orphan inode list. Please "
4267 "umount/remount instead");
4273 * Mounting a RDONLY partition read-write, so reread
4274 * and store the current valid flag. (It may have
4275 * been changed by e2fsck since we originally mounted
4279 ext4_clear_journal_err(sb, es);
4280 sbi->s_mount_state = le16_to_cpu(es->s_state);
4281 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
4283 if (!ext4_setup_super(sb, es, 0))
4284 sb->s_flags &= ~MS_RDONLY;
4290 * Reinitialize lazy itable initialization thread based on
4293 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4294 ext4_unregister_li_request(sb);
4296 ext4_group_t first_not_zeroed;
4297 first_not_zeroed = ext4_has_uninit_itable(sb);
4298 ext4_register_li_request(sb, first_not_zeroed);
4301 ext4_setup_system_zone(sb);
4302 if (sbi->s_journal == NULL)
4303 ext4_commit_super(sb, 1);
4306 /* Release old quota file names */
4307 for (i = 0; i < MAXQUOTAS; i++)
4308 if (old_opts.s_qf_names[i] &&
4309 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4310 kfree(old_opts.s_qf_names[i]);
4315 dquot_resume(sb, -1);
4317 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4322 sb->s_flags = old_sb_flags;
4323 sbi->s_mount_opt = old_opts.s_mount_opt;
4324 sbi->s_resuid = old_opts.s_resuid;
4325 sbi->s_resgid = old_opts.s_resgid;
4326 sbi->s_commit_interval = old_opts.s_commit_interval;
4327 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4328 sbi->s_max_batch_time = old_opts.s_max_batch_time;
4330 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4331 for (i = 0; i < MAXQUOTAS; i++) {
4332 if (sbi->s_qf_names[i] &&
4333 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4334 kfree(sbi->s_qf_names[i]);
4335 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4344 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4346 struct super_block *sb = dentry->d_sb;
4347 struct ext4_sb_info *sbi = EXT4_SB(sb);
4348 struct ext4_super_block *es = sbi->s_es;
4351 if (test_opt(sb, MINIX_DF)) {
4352 sbi->s_overhead_last = 0;
4353 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
4354 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4355 ext4_fsblk_t overhead = 0;
4358 * Compute the overhead (FS structures). This is constant
4359 * for a given filesystem unless the number of block groups
4360 * changes so we cache the previous value until it does.
4364 * All of the blocks before first_data_block are
4367 overhead = le32_to_cpu(es->s_first_data_block);
4370 * Add the overhead attributed to the superblock and
4371 * block group descriptors. If the sparse superblocks
4372 * feature is turned on, then not all groups have this.
4374 for (i = 0; i < ngroups; i++) {
4375 overhead += ext4_bg_has_super(sb, i) +
4376 ext4_bg_num_gdb(sb, i);
4381 * Every block group has an inode bitmap, a block
4382 * bitmap, and an inode table.
4384 overhead += ngroups * (2 + sbi->s_itb_per_group);
4385 sbi->s_overhead_last = overhead;
4387 sbi->s_blocks_last = ext4_blocks_count(es);
4390 buf->f_type = EXT4_SUPER_MAGIC;
4391 buf->f_bsize = sb->s_blocksize;
4392 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
4393 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
4394 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
4395 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4396 if (buf->f_bfree < ext4_r_blocks_count(es))
4398 buf->f_files = le32_to_cpu(es->s_inodes_count);
4399 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4400 buf->f_namelen = EXT4_NAME_LEN;
4401 fsid = le64_to_cpup((void *)es->s_uuid) ^
4402 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4403 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4404 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4409 /* Helper function for writing quotas on sync - we need to start transaction
4410 * before quota file is locked for write. Otherwise the are possible deadlocks:
4411 * Process 1 Process 2
4412 * ext4_create() quota_sync()
4413 * jbd2_journal_start() write_dquot()
4414 * dquot_initialize() down(dqio_mutex)
4415 * down(dqio_mutex) jbd2_journal_start()
4421 static inline struct inode *dquot_to_inode(struct dquot *dquot)
4423 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4426 static int ext4_write_dquot(struct dquot *dquot)
4430 struct inode *inode;
4432 inode = dquot_to_inode(dquot);
4433 handle = ext4_journal_start(inode,
4434 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4436 return PTR_ERR(handle);
4437 ret = dquot_commit(dquot);
4438 err = ext4_journal_stop(handle);
4444 static int ext4_acquire_dquot(struct dquot *dquot)
4449 handle = ext4_journal_start(dquot_to_inode(dquot),
4450 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4452 return PTR_ERR(handle);
4453 ret = dquot_acquire(dquot);
4454 err = ext4_journal_stop(handle);
4460 static int ext4_release_dquot(struct dquot *dquot)
4465 handle = ext4_journal_start(dquot_to_inode(dquot),
4466 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
4467 if (IS_ERR(handle)) {
4468 /* Release dquot anyway to avoid endless cycle in dqput() */
4469 dquot_release(dquot);
4470 return PTR_ERR(handle);
4472 ret = dquot_release(dquot);
4473 err = ext4_journal_stop(handle);
4479 static int ext4_mark_dquot_dirty(struct dquot *dquot)
4481 /* Are we journaling quotas? */
4482 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4483 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
4484 dquot_mark_dquot_dirty(dquot);
4485 return ext4_write_dquot(dquot);
4487 return dquot_mark_dquot_dirty(dquot);
4491 static int ext4_write_info(struct super_block *sb, int type)
4496 /* Data block + inode block */
4497 handle = ext4_journal_start(sb->s_root->d_inode, 2);
4499 return PTR_ERR(handle);
4500 ret = dquot_commit_info(sb, type);
4501 err = ext4_journal_stop(handle);
4508 * Turn on quotas during mount time - we need to find
4509 * the quota file and such...
4511 static int ext4_quota_on_mount(struct super_block *sb, int type)
4513 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4514 EXT4_SB(sb)->s_jquota_fmt, type);
4518 * Standard function to be called on quota_on
4520 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
4526 if (!test_opt(sb, QUOTA))
4529 err = kern_path(name, LOOKUP_FOLLOW, &path);
4533 /* Quotafile not on the same filesystem? */
4534 if (path.mnt->mnt_sb != sb) {
4538 /* Journaling quota? */
4539 if (EXT4_SB(sb)->s_qf_names[type]) {
4540 /* Quotafile not in fs root? */
4541 if (path.dentry->d_parent != sb->s_root)
4542 ext4_msg(sb, KERN_WARNING,
4543 "Quota file not on filesystem root. "
4544 "Journaled quota will not work");
4548 * When we journal data on quota file, we have to flush journal to see
4549 * all updates to the file when we bypass pagecache...
4551 if (EXT4_SB(sb)->s_journal &&
4552 ext4_should_journal_data(path.dentry->d_inode)) {
4554 * We don't need to lock updates but journal_flush() could
4555 * otherwise be livelocked...
4557 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
4558 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
4559 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4566 err = dquot_quota_on_path(sb, type, format_id, &path);
4571 static int ext4_quota_off(struct super_block *sb, int type)
4573 /* Force all delayed allocation blocks to be allocated */
4574 if (test_opt(sb, DELALLOC)) {
4575 down_read(&sb->s_umount);
4576 sync_filesystem(sb);
4577 up_read(&sb->s_umount);
4580 return dquot_quota_off(sb, type);
4583 /* Read data from quotafile - avoid pagecache and such because we cannot afford
4584 * acquiring the locks... As quota files are never truncated and quota code
4585 * itself serializes the operations (and noone else should touch the files)
4586 * we don't have to be afraid of races */
4587 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
4588 size_t len, loff_t off)
4590 struct inode *inode = sb_dqopt(sb)->files[type];
4591 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4593 int offset = off & (sb->s_blocksize - 1);
4596 struct buffer_head *bh;
4597 loff_t i_size = i_size_read(inode);
4601 if (off+len > i_size)
4604 while (toread > 0) {
4605 tocopy = sb->s_blocksize - offset < toread ?
4606 sb->s_blocksize - offset : toread;
4607 bh = ext4_bread(NULL, inode, blk, 0, &err);
4610 if (!bh) /* A hole? */
4611 memset(data, 0, tocopy);
4613 memcpy(data, bh->b_data+offset, tocopy);
4623 /* Write to quotafile (we know the transaction is already started and has
4624 * enough credits) */
4625 static ssize_t ext4_quota_write(struct super_block *sb, int type,
4626 const char *data, size_t len, loff_t off)
4628 struct inode *inode = sb_dqopt(sb)->files[type];
4629 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4631 int offset = off & (sb->s_blocksize - 1);
4632 struct buffer_head *bh;
4633 handle_t *handle = journal_current_handle();
4635 if (EXT4_SB(sb)->s_journal && !handle) {
4636 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4637 " cancelled because transaction is not started",
4638 (unsigned long long)off, (unsigned long long)len);
4642 * Since we account only one data block in transaction credits,
4643 * then it is impossible to cross a block boundary.
4645 if (sb->s_blocksize - offset < len) {
4646 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4647 " cancelled because not block aligned",
4648 (unsigned long long)off, (unsigned long long)len);
4652 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
4653 bh = ext4_bread(handle, inode, blk, 1, &err);
4656 err = ext4_journal_get_write_access(handle, bh);
4662 memcpy(bh->b_data+offset, data, len);
4663 flush_dcache_page(bh->b_page);
4665 err = ext4_handle_dirty_metadata(handle, NULL, bh);
4669 mutex_unlock(&inode->i_mutex);
4672 if (inode->i_size < off + len) {
4673 i_size_write(inode, off + len);
4674 EXT4_I(inode)->i_disksize = inode->i_size;
4676 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4677 ext4_mark_inode_dirty(handle, inode);
4678 mutex_unlock(&inode->i_mutex);
4684 static int ext4_get_sb(struct file_system_type *fs_type, int flags,
4685 const char *dev_name, void *data, struct vfsmount *mnt)
4687 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
4690 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4691 static struct file_system_type ext2_fs_type = {
4692 .owner = THIS_MODULE,
4694 .get_sb = ext4_get_sb,
4695 .kill_sb = kill_block_super,
4696 .fs_flags = FS_REQUIRES_DEV,
4699 static inline void register_as_ext2(void)
4701 int err = register_filesystem(&ext2_fs_type);
4704 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4707 static inline void unregister_as_ext2(void)
4709 unregister_filesystem(&ext2_fs_type);
4711 MODULE_ALIAS("ext2");
4713 static inline void register_as_ext2(void) { }
4714 static inline void unregister_as_ext2(void) { }
4717 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4718 static inline void register_as_ext3(void)
4720 int err = register_filesystem(&ext3_fs_type);
4723 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4726 static inline void unregister_as_ext3(void)
4728 unregister_filesystem(&ext3_fs_type);
4730 MODULE_ALIAS("ext3");
4732 static inline void register_as_ext3(void) { }
4733 static inline void unregister_as_ext3(void) { }
4736 static struct file_system_type ext4_fs_type = {
4737 .owner = THIS_MODULE,
4739 .get_sb = ext4_get_sb,
4740 .kill_sb = kill_block_super,
4741 .fs_flags = FS_REQUIRES_DEV,
4744 int __init ext4_init_feat_adverts(void)
4746 struct ext4_features *ef;
4749 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4753 ef->f_kobj.kset = ext4_kset;
4754 init_completion(&ef->f_kobj_unregister);
4755 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4768 static int __init init_ext4_fs(void)
4772 ext4_check_flag_values();
4773 err = init_ext4_pageio();
4776 err = init_ext4_system_zone();
4779 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4782 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
4784 err = ext4_init_feat_adverts();
4786 err = init_ext4_mballoc();
4790 err = init_ext4_xattr();
4793 err = init_inodecache();
4798 err = register_filesystem(&ext4_fs_type);
4802 ext4_li_info = NULL;
4803 mutex_init(&ext4_li_mtx);
4806 unregister_as_ext2();
4807 unregister_as_ext3();
4808 destroy_inodecache();
4812 exit_ext4_mballoc();
4815 remove_proc_entry("fs/ext4", NULL);
4816 kset_unregister(ext4_kset);
4818 exit_ext4_system_zone();
4824 static void __exit exit_ext4_fs(void)
4826 ext4_destroy_lazyinit_thread();
4827 unregister_as_ext2();
4828 unregister_as_ext3();
4829 unregister_filesystem(&ext4_fs_type);
4830 destroy_inodecache();
4832 exit_ext4_mballoc();
4833 remove_proc_entry("fs/ext4", NULL);
4834 kset_unregister(ext4_kset);
4835 exit_ext4_system_zone();
4839 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4840 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4841 MODULE_LICENSE("GPL");
4842 module_init(init_ext4_fs)
4843 module_exit(exit_ext4_fs)