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/slab.h>
25 #include <linux/init.h>
26 #include <linux/blkdev.h>
27 #include <linux/backing-dev.h>
28 #include <linux/parser.h>
29 #include <linux/buffer_head.h>
30 #include <linux/exportfs.h>
31 #include <linux/vfs.h>
32 #include <linux/random.h>
33 #include <linux/mount.h>
34 #include <linux/namei.h>
35 #include <linux/quotaops.h>
36 #include <linux/seq_file.h>
37 #include <linux/ctype.h>
38 #include <linux/log2.h>
39 #include <linux/crc16.h>
40 #include <linux/dax.h>
41 #include <linux/cleancache.h>
42 #include <linux/uaccess.h>
44 #include <linux/kthread.h>
45 #include <linux/freezer.h>
48 #include "ext4_extents.h" /* Needed for trace points definition */
49 #include "ext4_jbd2.h"
55 #define CREATE_TRACE_POINTS
56 #include <trace/events/ext4.h>
58 static struct ext4_lazy_init *ext4_li_info;
59 static struct mutex ext4_li_mtx;
60 static struct ratelimit_state ext4_mount_msg_ratelimit;
62 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
63 unsigned long journal_devnum);
64 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
65 static int ext4_commit_super(struct super_block *sb, int sync);
66 static void ext4_mark_recovery_complete(struct super_block *sb,
67 struct ext4_super_block *es);
68 static void ext4_clear_journal_err(struct super_block *sb,
69 struct ext4_super_block *es);
70 static int ext4_sync_fs(struct super_block *sb, int wait);
71 static int ext4_remount(struct super_block *sb, int *flags, char *data);
72 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
73 static int ext4_unfreeze(struct super_block *sb);
74 static int ext4_freeze(struct super_block *sb);
75 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
76 const char *dev_name, void *data);
77 static inline int ext2_feature_set_ok(struct super_block *sb);
78 static inline int ext3_feature_set_ok(struct super_block *sb);
79 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
80 static void ext4_destroy_lazyinit_thread(void);
81 static void ext4_unregister_li_request(struct super_block *sb);
82 static void ext4_clear_request_list(void);
83 static struct inode *ext4_get_journal_inode(struct super_block *sb,
84 unsigned int journal_inum);
89 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
90 * i_mmap_rwsem (inode->i_mmap_rwsem)!
93 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
94 * page lock -> i_data_sem (rw)
96 * buffered write path:
97 * sb_start_write -> i_mutex -> mmap_sem
98 * sb_start_write -> i_mutex -> transaction start -> page lock ->
102 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
103 * i_mmap_rwsem (w) -> page lock
104 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
105 * transaction start -> i_data_sem (rw)
108 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
109 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
110 * transaction start -> i_data_sem (rw)
113 * transaction start -> page lock(s) -> i_data_sem (rw)
116 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
117 static struct file_system_type ext2_fs_type = {
118 .owner = THIS_MODULE,
121 .kill_sb = kill_block_super,
122 .fs_flags = FS_REQUIRES_DEV,
124 MODULE_ALIAS_FS("ext2");
125 MODULE_ALIAS("ext2");
126 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
128 #define IS_EXT2_SB(sb) (0)
132 static struct file_system_type ext3_fs_type = {
133 .owner = THIS_MODULE,
136 .kill_sb = kill_block_super,
137 .fs_flags = FS_REQUIRES_DEV,
139 MODULE_ALIAS_FS("ext3");
140 MODULE_ALIAS("ext3");
141 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
143 static int ext4_verify_csum_type(struct super_block *sb,
144 struct ext4_super_block *es)
146 if (!ext4_has_feature_metadata_csum(sb))
149 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
152 static __le32 ext4_superblock_csum(struct super_block *sb,
153 struct ext4_super_block *es)
155 struct ext4_sb_info *sbi = EXT4_SB(sb);
156 int offset = offsetof(struct ext4_super_block, s_checksum);
159 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
161 return cpu_to_le32(csum);
164 static int ext4_superblock_csum_verify(struct super_block *sb,
165 struct ext4_super_block *es)
167 if (!ext4_has_metadata_csum(sb))
170 return es->s_checksum == ext4_superblock_csum(sb, es);
173 void ext4_superblock_csum_set(struct super_block *sb)
175 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
177 if (!ext4_has_metadata_csum(sb))
180 es->s_checksum = ext4_superblock_csum(sb, es);
183 void *ext4_kvmalloc(size_t size, gfp_t flags)
187 ret = kmalloc(size, flags | __GFP_NOWARN);
189 ret = __vmalloc(size, flags, PAGE_KERNEL);
193 void *ext4_kvzalloc(size_t size, gfp_t flags)
197 ret = kzalloc(size, flags | __GFP_NOWARN);
199 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
203 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
204 struct ext4_group_desc *bg)
206 return le32_to_cpu(bg->bg_block_bitmap_lo) |
207 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
208 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
211 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
212 struct ext4_group_desc *bg)
214 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
215 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
216 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
219 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
220 struct ext4_group_desc *bg)
222 return le32_to_cpu(bg->bg_inode_table_lo) |
223 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
224 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
227 __u32 ext4_free_group_clusters(struct super_block *sb,
228 struct ext4_group_desc *bg)
230 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
231 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
232 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
235 __u32 ext4_free_inodes_count(struct super_block *sb,
236 struct ext4_group_desc *bg)
238 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
239 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
240 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
243 __u32 ext4_used_dirs_count(struct super_block *sb,
244 struct ext4_group_desc *bg)
246 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
247 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
248 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
251 __u32 ext4_itable_unused_count(struct super_block *sb,
252 struct ext4_group_desc *bg)
254 return le16_to_cpu(bg->bg_itable_unused_lo) |
255 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
256 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
259 void ext4_block_bitmap_set(struct super_block *sb,
260 struct ext4_group_desc *bg, ext4_fsblk_t blk)
262 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
263 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
264 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
267 void ext4_inode_bitmap_set(struct super_block *sb,
268 struct ext4_group_desc *bg, ext4_fsblk_t blk)
270 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
271 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
272 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
275 void ext4_inode_table_set(struct super_block *sb,
276 struct ext4_group_desc *bg, ext4_fsblk_t blk)
278 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
279 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
280 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
283 void ext4_free_group_clusters_set(struct super_block *sb,
284 struct ext4_group_desc *bg, __u32 count)
286 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
287 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
288 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
291 void ext4_free_inodes_set(struct super_block *sb,
292 struct ext4_group_desc *bg, __u32 count)
294 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
295 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
296 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
299 void ext4_used_dirs_set(struct super_block *sb,
300 struct ext4_group_desc *bg, __u32 count)
302 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
303 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
304 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
307 void ext4_itable_unused_set(struct super_block *sb,
308 struct ext4_group_desc *bg, __u32 count)
310 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
311 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
312 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
316 static void __save_error_info(struct super_block *sb, const char *func,
319 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
321 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
322 if (bdev_read_only(sb->s_bdev))
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 le32_add_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 * The del_gendisk() function uninitializes the disk-specific data
354 * structures, including the bdi structure, without telling anyone
355 * else. Once this happens, any attempt to call mark_buffer_dirty()
356 * (for example, by ext4_commit_super), will cause a kernel OOPS.
357 * This is a kludge to prevent these oops until we can put in a proper
358 * hook in del_gendisk() to inform the VFS and file system layers.
360 static int block_device_ejected(struct super_block *sb)
362 struct inode *bd_inode = sb->s_bdev->bd_inode;
363 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
365 return bdi->dev == NULL;
368 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
370 struct super_block *sb = journal->j_private;
371 struct ext4_sb_info *sbi = EXT4_SB(sb);
372 int error = is_journal_aborted(journal);
373 struct ext4_journal_cb_entry *jce;
375 BUG_ON(txn->t_state == T_FINISHED);
377 ext4_process_freed_data(sb, txn->t_tid);
379 spin_lock(&sbi->s_md_lock);
380 while (!list_empty(&txn->t_private_list)) {
381 jce = list_entry(txn->t_private_list.next,
382 struct ext4_journal_cb_entry, jce_list);
383 list_del_init(&jce->jce_list);
384 spin_unlock(&sbi->s_md_lock);
385 jce->jce_func(sb, jce, error);
386 spin_lock(&sbi->s_md_lock);
388 spin_unlock(&sbi->s_md_lock);
391 /* Deal with the reporting of failure conditions on a filesystem such as
392 * inconsistencies detected or read IO failures.
394 * On ext2, we can store the error state of the filesystem in the
395 * superblock. That is not possible on ext4, because we may have other
396 * write ordering constraints on the superblock which prevent us from
397 * writing it out straight away; and given that the journal is about to
398 * be aborted, we can't rely on the current, or future, transactions to
399 * write out the superblock safely.
401 * We'll just use the jbd2_journal_abort() error code to record an error in
402 * the journal instead. On recovery, the journal will complain about
403 * that error until we've noted it down and cleared it.
406 static void ext4_handle_error(struct super_block *sb)
411 if (!test_opt(sb, ERRORS_CONT)) {
412 journal_t *journal = EXT4_SB(sb)->s_journal;
414 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
416 jbd2_journal_abort(journal, -EIO);
418 if (test_opt(sb, ERRORS_RO)) {
419 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
421 * Make sure updated value of ->s_mount_flags will be visible
422 * before ->s_flags update
425 sb->s_flags |= MS_RDONLY;
427 if (test_opt(sb, ERRORS_PANIC)) {
428 if (EXT4_SB(sb)->s_journal &&
429 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
431 panic("EXT4-fs (device %s): panic forced after error\n",
436 #define ext4_error_ratelimit(sb) \
437 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
440 void __ext4_error(struct super_block *sb, const char *function,
441 unsigned int line, const char *fmt, ...)
443 struct va_format vaf;
446 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
449 if (ext4_error_ratelimit(sb)) {
454 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
455 sb->s_id, function, line, current->comm, &vaf);
458 save_error_info(sb, function, line);
459 ext4_handle_error(sb);
462 void __ext4_error_inode(struct inode *inode, const char *function,
463 unsigned int line, ext4_fsblk_t block,
464 const char *fmt, ...)
467 struct va_format vaf;
468 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
470 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
473 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
474 es->s_last_error_block = cpu_to_le64(block);
475 if (ext4_error_ratelimit(inode->i_sb)) {
480 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
481 "inode #%lu: block %llu: comm %s: %pV\n",
482 inode->i_sb->s_id, function, line, inode->i_ino,
483 block, current->comm, &vaf);
485 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
486 "inode #%lu: comm %s: %pV\n",
487 inode->i_sb->s_id, function, line, inode->i_ino,
488 current->comm, &vaf);
491 save_error_info(inode->i_sb, function, line);
492 ext4_handle_error(inode->i_sb);
495 void __ext4_error_file(struct file *file, const char *function,
496 unsigned int line, ext4_fsblk_t block,
497 const char *fmt, ...)
500 struct va_format vaf;
501 struct ext4_super_block *es;
502 struct inode *inode = file_inode(file);
503 char pathname[80], *path;
505 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
508 es = EXT4_SB(inode->i_sb)->s_es;
509 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
510 if (ext4_error_ratelimit(inode->i_sb)) {
511 path = file_path(file, pathname, sizeof(pathname));
519 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
520 "block %llu: comm %s: path %s: %pV\n",
521 inode->i_sb->s_id, function, line, inode->i_ino,
522 block, current->comm, path, &vaf);
525 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
526 "comm %s: path %s: %pV\n",
527 inode->i_sb->s_id, function, line, inode->i_ino,
528 current->comm, path, &vaf);
531 save_error_info(inode->i_sb, function, line);
532 ext4_handle_error(inode->i_sb);
535 const char *ext4_decode_error(struct super_block *sb, int errno,
542 errstr = "Corrupt filesystem";
545 errstr = "Filesystem failed CRC";
548 errstr = "IO failure";
551 errstr = "Out of memory";
554 if (!sb || (EXT4_SB(sb)->s_journal &&
555 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
556 errstr = "Journal has aborted";
558 errstr = "Readonly filesystem";
561 /* If the caller passed in an extra buffer for unknown
562 * errors, textualise them now. Else we just return
565 /* Check for truncated error codes... */
566 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
575 /* __ext4_std_error decodes expected errors from journaling functions
576 * automatically and invokes the appropriate error response. */
578 void __ext4_std_error(struct super_block *sb, const char *function,
579 unsigned int line, int errno)
584 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
587 /* Special case: if the error is EROFS, and we're not already
588 * inside a transaction, then there's really no point in logging
590 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
593 if (ext4_error_ratelimit(sb)) {
594 errstr = ext4_decode_error(sb, errno, nbuf);
595 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
596 sb->s_id, function, line, errstr);
599 save_error_info(sb, function, line);
600 ext4_handle_error(sb);
604 * ext4_abort is a much stronger failure handler than ext4_error. The
605 * abort function may be used to deal with unrecoverable failures such
606 * as journal IO errors or ENOMEM at a critical moment in log management.
608 * We unconditionally force the filesystem into an ABORT|READONLY state,
609 * unless the error response on the fs has been set to panic in which
610 * case we take the easy way out and panic immediately.
613 void __ext4_abort(struct super_block *sb, const char *function,
614 unsigned int line, const char *fmt, ...)
616 struct va_format vaf;
619 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
622 save_error_info(sb, function, line);
626 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
627 sb->s_id, function, line, &vaf);
630 if (sb_rdonly(sb) == 0) {
631 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
632 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
634 * Make sure updated value of ->s_mount_flags will be visible
635 * before ->s_flags update
638 sb->s_flags |= MS_RDONLY;
639 if (EXT4_SB(sb)->s_journal)
640 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
641 save_error_info(sb, function, line);
643 if (test_opt(sb, ERRORS_PANIC)) {
644 if (EXT4_SB(sb)->s_journal &&
645 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
647 panic("EXT4-fs panic from previous error\n");
651 void __ext4_msg(struct super_block *sb,
652 const char *prefix, const char *fmt, ...)
654 struct va_format vaf;
657 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
663 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
667 #define ext4_warning_ratelimit(sb) \
668 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
671 void __ext4_warning(struct super_block *sb, const char *function,
672 unsigned int line, const char *fmt, ...)
674 struct va_format vaf;
677 if (!ext4_warning_ratelimit(sb))
683 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
684 sb->s_id, function, line, &vaf);
688 void __ext4_warning_inode(const struct inode *inode, const char *function,
689 unsigned int line, const char *fmt, ...)
691 struct va_format vaf;
694 if (!ext4_warning_ratelimit(inode->i_sb))
700 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
701 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
702 function, line, inode->i_ino, current->comm, &vaf);
706 void __ext4_grp_locked_error(const char *function, unsigned int line,
707 struct super_block *sb, ext4_group_t grp,
708 unsigned long ino, ext4_fsblk_t block,
709 const char *fmt, ...)
713 struct va_format vaf;
715 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
717 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
720 es->s_last_error_ino = cpu_to_le32(ino);
721 es->s_last_error_block = cpu_to_le64(block);
722 __save_error_info(sb, function, line);
724 if (ext4_error_ratelimit(sb)) {
728 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
729 sb->s_id, function, line, grp);
731 printk(KERN_CONT "inode %lu: ", ino);
733 printk(KERN_CONT "block %llu:",
734 (unsigned long long) block);
735 printk(KERN_CONT "%pV\n", &vaf);
739 if (test_opt(sb, ERRORS_CONT)) {
740 ext4_commit_super(sb, 0);
744 ext4_unlock_group(sb, grp);
745 ext4_commit_super(sb, 1);
746 ext4_handle_error(sb);
748 * We only get here in the ERRORS_RO case; relocking the group
749 * may be dangerous, but nothing bad will happen since the
750 * filesystem will have already been marked read/only and the
751 * journal has been aborted. We return 1 as a hint to callers
752 * who might what to use the return value from
753 * ext4_grp_locked_error() to distinguish between the
754 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
755 * aggressively from the ext4 function in question, with a
756 * more appropriate error code.
758 ext4_lock_group(sb, grp);
762 void ext4_update_dynamic_rev(struct super_block *sb)
764 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
766 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
770 "updating to rev %d because of new feature flag, "
771 "running e2fsck is recommended",
774 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
775 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
776 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
777 /* leave es->s_feature_*compat flags alone */
778 /* es->s_uuid will be set by e2fsck if empty */
781 * The rest of the superblock fields should be zero, and if not it
782 * means they are likely already in use, so leave them alone. We
783 * can leave it up to e2fsck to clean up any inconsistencies there.
788 * Open the external journal device
790 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
792 struct block_device *bdev;
793 char b[BDEVNAME_SIZE];
795 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
801 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
802 __bdevname(dev, b), PTR_ERR(bdev));
807 * Release the journal device
809 static void ext4_blkdev_put(struct block_device *bdev)
811 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
814 static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
816 struct block_device *bdev;
817 bdev = sbi->journal_bdev;
819 ext4_blkdev_put(bdev);
820 sbi->journal_bdev = NULL;
824 static inline struct inode *orphan_list_entry(struct list_head *l)
826 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
829 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
833 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
834 le32_to_cpu(sbi->s_es->s_last_orphan));
836 printk(KERN_ERR "sb_info orphan list:\n");
837 list_for_each(l, &sbi->s_orphan) {
838 struct inode *inode = orphan_list_entry(l);
840 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
841 inode->i_sb->s_id, inode->i_ino, inode,
842 inode->i_mode, inode->i_nlink,
848 static int ext4_quota_off(struct super_block *sb, int type);
850 static inline void ext4_quota_off_umount(struct super_block *sb)
854 /* Use our quota_off function to clear inode flags etc. */
855 for (type = 0; type < EXT4_MAXQUOTAS; type++)
856 ext4_quota_off(sb, type);
859 static inline void ext4_quota_off_umount(struct super_block *sb)
864 static void ext4_put_super(struct super_block *sb)
866 struct ext4_sb_info *sbi = EXT4_SB(sb);
867 struct ext4_super_block *es = sbi->s_es;
871 ext4_unregister_li_request(sb);
872 ext4_quota_off_umount(sb);
874 flush_workqueue(sbi->rsv_conversion_wq);
875 destroy_workqueue(sbi->rsv_conversion_wq);
877 if (sbi->s_journal) {
878 aborted = is_journal_aborted(sbi->s_journal);
879 err = jbd2_journal_destroy(sbi->s_journal);
880 sbi->s_journal = NULL;
881 if ((err < 0) && !aborted)
882 ext4_abort(sb, "Couldn't clean up the journal");
885 ext4_unregister_sysfs(sb);
886 ext4_es_unregister_shrinker(sbi);
887 del_timer_sync(&sbi->s_err_report);
888 ext4_release_system_zone(sb);
890 ext4_ext_release(sb);
892 if (!sb_rdonly(sb) && !aborted) {
893 ext4_clear_feature_journal_needs_recovery(sb);
894 es->s_state = cpu_to_le16(sbi->s_mount_state);
897 ext4_commit_super(sb, 1);
899 for (i = 0; i < sbi->s_gdb_count; i++)
900 brelse(sbi->s_group_desc[i]);
901 kvfree(sbi->s_group_desc);
902 kvfree(sbi->s_flex_groups);
903 percpu_counter_destroy(&sbi->s_freeclusters_counter);
904 percpu_counter_destroy(&sbi->s_freeinodes_counter);
905 percpu_counter_destroy(&sbi->s_dirs_counter);
906 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
907 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
909 for (i = 0; i < EXT4_MAXQUOTAS; i++)
910 kfree(sbi->s_qf_names[i]);
913 /* Debugging code just in case the in-memory inode orphan list
914 * isn't empty. The on-disk one can be non-empty if we've
915 * detected an error and taken the fs readonly, but the
916 * in-memory list had better be clean by this point. */
917 if (!list_empty(&sbi->s_orphan))
918 dump_orphan_list(sb, sbi);
919 J_ASSERT(list_empty(&sbi->s_orphan));
921 sync_blockdev(sb->s_bdev);
922 invalidate_bdev(sb->s_bdev);
923 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
925 * Invalidate the journal device's buffers. We don't want them
926 * floating about in memory - the physical journal device may
927 * hotswapped, and it breaks the `ro-after' testing code.
929 sync_blockdev(sbi->journal_bdev);
930 invalidate_bdev(sbi->journal_bdev);
931 ext4_blkdev_remove(sbi);
933 if (sbi->s_ea_inode_cache) {
934 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
935 sbi->s_ea_inode_cache = NULL;
937 if (sbi->s_ea_block_cache) {
938 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
939 sbi->s_ea_block_cache = NULL;
942 kthread_stop(sbi->s_mmp_tsk);
944 sb->s_fs_info = NULL;
946 * Now that we are completely done shutting down the
947 * superblock, we need to actually destroy the kobject.
949 kobject_put(&sbi->s_kobj);
950 wait_for_completion(&sbi->s_kobj_unregister);
951 if (sbi->s_chksum_driver)
952 crypto_free_shash(sbi->s_chksum_driver);
953 kfree(sbi->s_blockgroup_lock);
954 fs_put_dax(sbi->s_daxdev);
958 static struct kmem_cache *ext4_inode_cachep;
961 * Called inside transaction, so use GFP_NOFS
963 static struct inode *ext4_alloc_inode(struct super_block *sb)
965 struct ext4_inode_info *ei;
967 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
971 ei->vfs_inode.i_version = 1;
972 spin_lock_init(&ei->i_raw_lock);
973 INIT_LIST_HEAD(&ei->i_prealloc_list);
974 spin_lock_init(&ei->i_prealloc_lock);
975 ext4_es_init_tree(&ei->i_es_tree);
976 rwlock_init(&ei->i_es_lock);
977 INIT_LIST_HEAD(&ei->i_es_list);
980 ei->i_es_shrink_lblk = 0;
981 ei->i_reserved_data_blocks = 0;
982 ei->i_da_metadata_calc_len = 0;
983 ei->i_da_metadata_calc_last_lblock = 0;
984 spin_lock_init(&(ei->i_block_reservation_lock));
986 ei->i_reserved_quota = 0;
987 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
990 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
991 spin_lock_init(&ei->i_completed_io_lock);
993 ei->i_datasync_tid = 0;
994 atomic_set(&ei->i_unwritten, 0);
995 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
996 return &ei->vfs_inode;
999 static int ext4_drop_inode(struct inode *inode)
1001 int drop = generic_drop_inode(inode);
1003 trace_ext4_drop_inode(inode, drop);
1007 static void ext4_i_callback(struct rcu_head *head)
1009 struct inode *inode = container_of(head, struct inode, i_rcu);
1010 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1013 static void ext4_destroy_inode(struct inode *inode)
1015 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
1016 ext4_msg(inode->i_sb, KERN_ERR,
1017 "Inode %lu (%p): orphan list check failed!",
1018 inode->i_ino, EXT4_I(inode));
1019 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1020 EXT4_I(inode), sizeof(struct ext4_inode_info),
1024 call_rcu(&inode->i_rcu, ext4_i_callback);
1027 static void init_once(void *foo)
1029 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
1031 INIT_LIST_HEAD(&ei->i_orphan);
1032 init_rwsem(&ei->xattr_sem);
1033 init_rwsem(&ei->i_data_sem);
1034 init_rwsem(&ei->i_mmap_sem);
1035 inode_init_once(&ei->vfs_inode);
1038 static int __init init_inodecache(void)
1040 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1041 sizeof(struct ext4_inode_info),
1042 0, (SLAB_RECLAIM_ACCOUNT|
1043 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1045 if (ext4_inode_cachep == NULL)
1050 static void destroy_inodecache(void)
1053 * Make sure all delayed rcu free inodes are flushed before we
1057 kmem_cache_destroy(ext4_inode_cachep);
1060 void ext4_clear_inode(struct inode *inode)
1062 invalidate_inode_buffers(inode);
1065 ext4_discard_preallocations(inode);
1066 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1067 if (EXT4_I(inode)->jinode) {
1068 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1069 EXT4_I(inode)->jinode);
1070 jbd2_free_inode(EXT4_I(inode)->jinode);
1071 EXT4_I(inode)->jinode = NULL;
1073 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1074 fscrypt_put_encryption_info(inode, NULL);
1078 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1079 u64 ino, u32 generation)
1081 struct inode *inode;
1083 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1084 return ERR_PTR(-ESTALE);
1085 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1086 return ERR_PTR(-ESTALE);
1088 /* iget isn't really right if the inode is currently unallocated!!
1090 * ext4_read_inode will return a bad_inode if the inode had been
1091 * deleted, so we should be safe.
1093 * Currently we don't know the generation for parent directory, so
1094 * a generation of 0 means "accept any"
1096 inode = ext4_iget_normal(sb, ino);
1098 return ERR_CAST(inode);
1099 if (generation && inode->i_generation != generation) {
1101 return ERR_PTR(-ESTALE);
1107 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1108 int fh_len, int fh_type)
1110 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1111 ext4_nfs_get_inode);
1114 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1115 int fh_len, int fh_type)
1117 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1118 ext4_nfs_get_inode);
1122 * Try to release metadata pages (indirect blocks, directories) which are
1123 * mapped via the block device. Since these pages could have journal heads
1124 * which would prevent try_to_free_buffers() from freeing them, we must use
1125 * jbd2 layer's try_to_free_buffers() function to release them.
1127 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1130 journal_t *journal = EXT4_SB(sb)->s_journal;
1132 WARN_ON(PageChecked(page));
1133 if (!page_has_buffers(page))
1136 return jbd2_journal_try_to_free_buffers(journal, page,
1137 wait & ~__GFP_DIRECT_RECLAIM);
1138 return try_to_free_buffers(page);
1141 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1142 static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1144 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1145 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1148 static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1151 handle_t *handle = fs_data;
1152 int res, res2, credits, retries = 0;
1155 * Encrypting the root directory is not allowed because e2fsck expects
1156 * lost+found to exist and be unencrypted, and encrypting the root
1157 * directory would imply encrypting the lost+found directory as well as
1158 * the filename "lost+found" itself.
1160 if (inode->i_ino == EXT4_ROOT_INO)
1163 res = ext4_convert_inline_data(inode);
1168 * If a journal handle was specified, then the encryption context is
1169 * being set on a new inode via inheritance and is part of a larger
1170 * transaction to create the inode. Otherwise the encryption context is
1171 * being set on an existing inode in its own transaction. Only in the
1172 * latter case should the "retry on ENOSPC" logic be used.
1176 res = ext4_xattr_set_handle(handle, inode,
1177 EXT4_XATTR_INDEX_ENCRYPTION,
1178 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1181 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1182 ext4_clear_inode_state(inode,
1183 EXT4_STATE_MAY_INLINE_DATA);
1185 * Update inode->i_flags - e.g. S_DAX may get disabled
1187 ext4_set_inode_flags(inode);
1192 res = dquot_initialize(inode);
1196 res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1201 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
1203 return PTR_ERR(handle);
1205 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1206 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1209 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1210 /* Update inode->i_flags - e.g. S_DAX may get disabled */
1211 ext4_set_inode_flags(inode);
1212 res = ext4_mark_inode_dirty(handle, inode);
1214 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1216 res2 = ext4_journal_stop(handle);
1218 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1225 static bool ext4_dummy_context(struct inode *inode)
1227 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1230 static unsigned ext4_max_namelen(struct inode *inode)
1232 return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize :
1236 static const struct fscrypt_operations ext4_cryptops = {
1237 .key_prefix = "ext4:",
1238 .get_context = ext4_get_context,
1239 .set_context = ext4_set_context,
1240 .dummy_context = ext4_dummy_context,
1241 .is_encrypted = ext4_encrypted_inode,
1242 .empty_dir = ext4_empty_dir,
1243 .max_namelen = ext4_max_namelen,
1246 static const struct fscrypt_operations ext4_cryptops = {
1247 .is_encrypted = ext4_encrypted_inode,
1252 static const char * const quotatypes[] = INITQFNAMES;
1253 #define QTYPE2NAME(t) (quotatypes[t])
1255 static int ext4_write_dquot(struct dquot *dquot);
1256 static int ext4_acquire_dquot(struct dquot *dquot);
1257 static int ext4_release_dquot(struct dquot *dquot);
1258 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1259 static int ext4_write_info(struct super_block *sb, int type);
1260 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1261 const struct path *path);
1262 static int ext4_quota_on_mount(struct super_block *sb, int type);
1263 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1264 size_t len, loff_t off);
1265 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1266 const char *data, size_t len, loff_t off);
1267 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1268 unsigned int flags);
1269 static int ext4_enable_quotas(struct super_block *sb);
1270 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
1272 static struct dquot **ext4_get_dquots(struct inode *inode)
1274 return EXT4_I(inode)->i_dquot;
1277 static const struct dquot_operations ext4_quota_operations = {
1278 .get_reserved_space = ext4_get_reserved_space,
1279 .write_dquot = ext4_write_dquot,
1280 .acquire_dquot = ext4_acquire_dquot,
1281 .release_dquot = ext4_release_dquot,
1282 .mark_dirty = ext4_mark_dquot_dirty,
1283 .write_info = ext4_write_info,
1284 .alloc_dquot = dquot_alloc,
1285 .destroy_dquot = dquot_destroy,
1286 .get_projid = ext4_get_projid,
1287 .get_inode_usage = ext4_get_inode_usage,
1288 .get_next_id = ext4_get_next_id,
1291 static const struct quotactl_ops ext4_qctl_operations = {
1292 .quota_on = ext4_quota_on,
1293 .quota_off = ext4_quota_off,
1294 .quota_sync = dquot_quota_sync,
1295 .get_state = dquot_get_state,
1296 .set_info = dquot_set_dqinfo,
1297 .get_dqblk = dquot_get_dqblk,
1298 .set_dqblk = dquot_set_dqblk,
1299 .get_nextdqblk = dquot_get_next_dqblk,
1303 static const struct super_operations ext4_sops = {
1304 .alloc_inode = ext4_alloc_inode,
1305 .destroy_inode = ext4_destroy_inode,
1306 .write_inode = ext4_write_inode,
1307 .dirty_inode = ext4_dirty_inode,
1308 .drop_inode = ext4_drop_inode,
1309 .evict_inode = ext4_evict_inode,
1310 .put_super = ext4_put_super,
1311 .sync_fs = ext4_sync_fs,
1312 .freeze_fs = ext4_freeze,
1313 .unfreeze_fs = ext4_unfreeze,
1314 .statfs = ext4_statfs,
1315 .remount_fs = ext4_remount,
1316 .show_options = ext4_show_options,
1318 .quota_read = ext4_quota_read,
1319 .quota_write = ext4_quota_write,
1320 .get_dquots = ext4_get_dquots,
1322 .bdev_try_to_free_page = bdev_try_to_free_page,
1325 static const struct export_operations ext4_export_ops = {
1326 .fh_to_dentry = ext4_fh_to_dentry,
1327 .fh_to_parent = ext4_fh_to_parent,
1328 .get_parent = ext4_get_parent,
1332 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1333 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1334 Opt_nouid32, Opt_debug, Opt_removed,
1335 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1336 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1337 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1338 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1339 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1340 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1341 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1342 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1343 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1344 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1345 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1346 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1347 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1348 Opt_inode_readahead_blks, Opt_journal_ioprio,
1349 Opt_dioread_nolock, Opt_dioread_lock,
1350 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1351 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
1354 static const match_table_t tokens = {
1355 {Opt_bsd_df, "bsddf"},
1356 {Opt_minix_df, "minixdf"},
1357 {Opt_grpid, "grpid"},
1358 {Opt_grpid, "bsdgroups"},
1359 {Opt_nogrpid, "nogrpid"},
1360 {Opt_nogrpid, "sysvgroups"},
1361 {Opt_resgid, "resgid=%u"},
1362 {Opt_resuid, "resuid=%u"},
1364 {Opt_err_cont, "errors=continue"},
1365 {Opt_err_panic, "errors=panic"},
1366 {Opt_err_ro, "errors=remount-ro"},
1367 {Opt_nouid32, "nouid32"},
1368 {Opt_debug, "debug"},
1369 {Opt_removed, "oldalloc"},
1370 {Opt_removed, "orlov"},
1371 {Opt_user_xattr, "user_xattr"},
1372 {Opt_nouser_xattr, "nouser_xattr"},
1374 {Opt_noacl, "noacl"},
1375 {Opt_noload, "norecovery"},
1376 {Opt_noload, "noload"},
1377 {Opt_removed, "nobh"},
1378 {Opt_removed, "bh"},
1379 {Opt_commit, "commit=%u"},
1380 {Opt_min_batch_time, "min_batch_time=%u"},
1381 {Opt_max_batch_time, "max_batch_time=%u"},
1382 {Opt_journal_dev, "journal_dev=%u"},
1383 {Opt_journal_path, "journal_path=%s"},
1384 {Opt_journal_checksum, "journal_checksum"},
1385 {Opt_nojournal_checksum, "nojournal_checksum"},
1386 {Opt_journal_async_commit, "journal_async_commit"},
1387 {Opt_abort, "abort"},
1388 {Opt_data_journal, "data=journal"},
1389 {Opt_data_ordered, "data=ordered"},
1390 {Opt_data_writeback, "data=writeback"},
1391 {Opt_data_err_abort, "data_err=abort"},
1392 {Opt_data_err_ignore, "data_err=ignore"},
1393 {Opt_offusrjquota, "usrjquota="},
1394 {Opt_usrjquota, "usrjquota=%s"},
1395 {Opt_offgrpjquota, "grpjquota="},
1396 {Opt_grpjquota, "grpjquota=%s"},
1397 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1398 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1399 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1400 {Opt_grpquota, "grpquota"},
1401 {Opt_noquota, "noquota"},
1402 {Opt_quota, "quota"},
1403 {Opt_usrquota, "usrquota"},
1404 {Opt_prjquota, "prjquota"},
1405 {Opt_barrier, "barrier=%u"},
1406 {Opt_barrier, "barrier"},
1407 {Opt_nobarrier, "nobarrier"},
1408 {Opt_i_version, "i_version"},
1410 {Opt_stripe, "stripe=%u"},
1411 {Opt_delalloc, "delalloc"},
1412 {Opt_lazytime, "lazytime"},
1413 {Opt_nolazytime, "nolazytime"},
1414 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
1415 {Opt_nodelalloc, "nodelalloc"},
1416 {Opt_removed, "mblk_io_submit"},
1417 {Opt_removed, "nomblk_io_submit"},
1418 {Opt_block_validity, "block_validity"},
1419 {Opt_noblock_validity, "noblock_validity"},
1420 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1421 {Opt_journal_ioprio, "journal_ioprio=%u"},
1422 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1423 {Opt_auto_da_alloc, "auto_da_alloc"},
1424 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1425 {Opt_dioread_nolock, "dioread_nolock"},
1426 {Opt_dioread_lock, "dioread_lock"},
1427 {Opt_discard, "discard"},
1428 {Opt_nodiscard, "nodiscard"},
1429 {Opt_init_itable, "init_itable=%u"},
1430 {Opt_init_itable, "init_itable"},
1431 {Opt_noinit_itable, "noinit_itable"},
1432 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1433 {Opt_test_dummy_encryption, "test_dummy_encryption"},
1434 {Opt_nombcache, "nombcache"},
1435 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
1436 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1437 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1438 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1439 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1440 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
1444 static ext4_fsblk_t get_sb_block(void **data)
1446 ext4_fsblk_t sb_block;
1447 char *options = (char *) *data;
1449 if (!options || strncmp(options, "sb=", 3) != 0)
1450 return 1; /* Default location */
1453 /* TODO: use simple_strtoll with >32bit ext4 */
1454 sb_block = simple_strtoul(options, &options, 0);
1455 if (*options && *options != ',') {
1456 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1460 if (*options == ',')
1462 *data = (void *) options;
1467 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1468 static const char deprecated_msg[] =
1469 "Mount option \"%s\" will be removed by %s\n"
1470 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1473 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1475 struct ext4_sb_info *sbi = EXT4_SB(sb);
1479 if (sb_any_quota_loaded(sb) &&
1480 !sbi->s_qf_names[qtype]) {
1481 ext4_msg(sb, KERN_ERR,
1482 "Cannot change journaled "
1483 "quota options when quota turned on");
1486 if (ext4_has_feature_quota(sb)) {
1487 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1488 "ignored when QUOTA feature is enabled");
1491 qname = match_strdup(args);
1493 ext4_msg(sb, KERN_ERR,
1494 "Not enough memory for storing quotafile name");
1497 if (sbi->s_qf_names[qtype]) {
1498 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1501 ext4_msg(sb, KERN_ERR,
1502 "%s quota file already specified",
1506 if (strchr(qname, '/')) {
1507 ext4_msg(sb, KERN_ERR,
1508 "quotafile must be on filesystem root");
1511 sbi->s_qf_names[qtype] = qname;
1519 static int clear_qf_name(struct super_block *sb, int qtype)
1522 struct ext4_sb_info *sbi = EXT4_SB(sb);
1524 if (sb_any_quota_loaded(sb) &&
1525 sbi->s_qf_names[qtype]) {
1526 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1527 " when quota turned on");
1530 kfree(sbi->s_qf_names[qtype]);
1531 sbi->s_qf_names[qtype] = NULL;
1536 #define MOPT_SET 0x0001
1537 #define MOPT_CLEAR 0x0002
1538 #define MOPT_NOSUPPORT 0x0004
1539 #define MOPT_EXPLICIT 0x0008
1540 #define MOPT_CLEAR_ERR 0x0010
1541 #define MOPT_GTE0 0x0020
1544 #define MOPT_QFMT 0x0040
1546 #define MOPT_Q MOPT_NOSUPPORT
1547 #define MOPT_QFMT MOPT_NOSUPPORT
1549 #define MOPT_DATAJ 0x0080
1550 #define MOPT_NO_EXT2 0x0100
1551 #define MOPT_NO_EXT3 0x0200
1552 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1553 #define MOPT_STRING 0x0400
1555 static const struct mount_opts {
1559 } ext4_mount_opts[] = {
1560 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1561 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1562 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1563 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1564 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1565 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1566 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1567 MOPT_EXT4_ONLY | MOPT_SET},
1568 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1569 MOPT_EXT4_ONLY | MOPT_CLEAR},
1570 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1571 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1572 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1573 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1574 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1575 MOPT_EXT4_ONLY | MOPT_CLEAR},
1576 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1577 MOPT_EXT4_ONLY | MOPT_CLEAR},
1578 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1579 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1580 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1581 EXT4_MOUNT_JOURNAL_CHECKSUM),
1582 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1583 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1584 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1585 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1586 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1587 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1589 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1591 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1592 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1593 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1594 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1595 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1596 {Opt_commit, 0, MOPT_GTE0},
1597 {Opt_max_batch_time, 0, MOPT_GTE0},
1598 {Opt_min_batch_time, 0, MOPT_GTE0},
1599 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1600 {Opt_init_itable, 0, MOPT_GTE0},
1601 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1602 {Opt_stripe, 0, MOPT_GTE0},
1603 {Opt_resuid, 0, MOPT_GTE0},
1604 {Opt_resgid, 0, MOPT_GTE0},
1605 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1606 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1607 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1608 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1609 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1610 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1611 MOPT_NO_EXT2 | MOPT_DATAJ},
1612 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1613 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1614 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1615 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1616 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1618 {Opt_acl, 0, MOPT_NOSUPPORT},
1619 {Opt_noacl, 0, MOPT_NOSUPPORT},
1621 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1622 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1623 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
1624 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1625 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1627 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1629 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1631 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1632 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1633 MOPT_CLEAR | MOPT_Q},
1634 {Opt_usrjquota, 0, MOPT_Q},
1635 {Opt_grpjquota, 0, MOPT_Q},
1636 {Opt_offusrjquota, 0, MOPT_Q},
1637 {Opt_offgrpjquota, 0, MOPT_Q},
1638 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1639 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1640 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1641 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1642 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
1643 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
1647 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1648 substring_t *args, unsigned long *journal_devnum,
1649 unsigned int *journal_ioprio, int is_remount)
1651 struct ext4_sb_info *sbi = EXT4_SB(sb);
1652 const struct mount_opts *m;
1658 if (token == Opt_usrjquota)
1659 return set_qf_name(sb, USRQUOTA, &args[0]);
1660 else if (token == Opt_grpjquota)
1661 return set_qf_name(sb, GRPQUOTA, &args[0]);
1662 else if (token == Opt_offusrjquota)
1663 return clear_qf_name(sb, USRQUOTA);
1664 else if (token == Opt_offgrpjquota)
1665 return clear_qf_name(sb, GRPQUOTA);
1669 case Opt_nouser_xattr:
1670 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1673 return 1; /* handled by get_sb_block() */
1675 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1678 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1681 sb->s_flags |= SB_I_VERSION;
1684 sb->s_flags |= MS_LAZYTIME;
1686 case Opt_nolazytime:
1687 sb->s_flags &= ~MS_LAZYTIME;
1691 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1692 if (token == m->token)
1695 if (m->token == Opt_err) {
1696 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1697 "or missing value", opt);
1701 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1702 ext4_msg(sb, KERN_ERR,
1703 "Mount option \"%s\" incompatible with ext2", opt);
1706 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1707 ext4_msg(sb, KERN_ERR,
1708 "Mount option \"%s\" incompatible with ext3", opt);
1712 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1714 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1716 if (m->flags & MOPT_EXPLICIT) {
1717 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1718 set_opt2(sb, EXPLICIT_DELALLOC);
1719 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1720 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
1724 if (m->flags & MOPT_CLEAR_ERR)
1725 clear_opt(sb, ERRORS_MASK);
1726 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1727 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1728 "options when quota turned on");
1732 if (m->flags & MOPT_NOSUPPORT) {
1733 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1734 } else if (token == Opt_commit) {
1736 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1737 sbi->s_commit_interval = HZ * arg;
1738 } else if (token == Opt_debug_want_extra_isize) {
1739 sbi->s_want_extra_isize = arg;
1740 } else if (token == Opt_max_batch_time) {
1741 sbi->s_max_batch_time = arg;
1742 } else if (token == Opt_min_batch_time) {
1743 sbi->s_min_batch_time = arg;
1744 } else if (token == Opt_inode_readahead_blks) {
1745 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1746 ext4_msg(sb, KERN_ERR,
1747 "EXT4-fs: inode_readahead_blks must be "
1748 "0 or a power of 2 smaller than 2^31");
1751 sbi->s_inode_readahead_blks = arg;
1752 } else if (token == Opt_init_itable) {
1753 set_opt(sb, INIT_INODE_TABLE);
1755 arg = EXT4_DEF_LI_WAIT_MULT;
1756 sbi->s_li_wait_mult = arg;
1757 } else if (token == Opt_max_dir_size_kb) {
1758 sbi->s_max_dir_size_kb = arg;
1759 } else if (token == Opt_stripe) {
1760 sbi->s_stripe = arg;
1761 } else if (token == Opt_resuid) {
1762 uid = make_kuid(current_user_ns(), arg);
1763 if (!uid_valid(uid)) {
1764 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1767 sbi->s_resuid = uid;
1768 } else if (token == Opt_resgid) {
1769 gid = make_kgid(current_user_ns(), arg);
1770 if (!gid_valid(gid)) {
1771 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1774 sbi->s_resgid = gid;
1775 } else if (token == Opt_journal_dev) {
1777 ext4_msg(sb, KERN_ERR,
1778 "Cannot specify journal on remount");
1781 *journal_devnum = arg;
1782 } else if (token == Opt_journal_path) {
1784 struct inode *journal_inode;
1789 ext4_msg(sb, KERN_ERR,
1790 "Cannot specify journal on remount");
1793 journal_path = match_strdup(&args[0]);
1794 if (!journal_path) {
1795 ext4_msg(sb, KERN_ERR, "error: could not dup "
1796 "journal device string");
1800 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1802 ext4_msg(sb, KERN_ERR, "error: could not find "
1803 "journal device path: error %d", error);
1804 kfree(journal_path);
1808 journal_inode = d_inode(path.dentry);
1809 if (!S_ISBLK(journal_inode->i_mode)) {
1810 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1811 "is not a block device", journal_path);
1813 kfree(journal_path);
1817 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1819 kfree(journal_path);
1820 } else if (token == Opt_journal_ioprio) {
1822 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1827 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1828 } else if (token == Opt_test_dummy_encryption) {
1829 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1830 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1831 ext4_msg(sb, KERN_WARNING,
1832 "Test dummy encryption mode enabled");
1834 ext4_msg(sb, KERN_WARNING,
1835 "Test dummy encryption mount option ignored");
1837 } else if (m->flags & MOPT_DATAJ) {
1839 if (!sbi->s_journal)
1840 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1841 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
1842 ext4_msg(sb, KERN_ERR,
1843 "Cannot change data mode on remount");
1847 clear_opt(sb, DATA_FLAGS);
1848 sbi->s_mount_opt |= m->mount_opt;
1851 } else if (m->flags & MOPT_QFMT) {
1852 if (sb_any_quota_loaded(sb) &&
1853 sbi->s_jquota_fmt != m->mount_opt) {
1854 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1855 "quota options when quota turned on");
1858 if (ext4_has_feature_quota(sb)) {
1859 ext4_msg(sb, KERN_INFO,
1860 "Quota format mount options ignored "
1861 "when QUOTA feature is enabled");
1864 sbi->s_jquota_fmt = m->mount_opt;
1866 } else if (token == Opt_dax) {
1867 #ifdef CONFIG_FS_DAX
1868 ext4_msg(sb, KERN_WARNING,
1869 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1870 sbi->s_mount_opt |= m->mount_opt;
1872 ext4_msg(sb, KERN_INFO, "dax option not supported");
1875 } else if (token == Opt_data_err_abort) {
1876 sbi->s_mount_opt |= m->mount_opt;
1877 } else if (token == Opt_data_err_ignore) {
1878 sbi->s_mount_opt &= ~m->mount_opt;
1882 if (m->flags & MOPT_CLEAR)
1884 else if (unlikely(!(m->flags & MOPT_SET))) {
1885 ext4_msg(sb, KERN_WARNING,
1886 "buggy handling of option %s", opt);
1891 sbi->s_mount_opt |= m->mount_opt;
1893 sbi->s_mount_opt &= ~m->mount_opt;
1898 static int parse_options(char *options, struct super_block *sb,
1899 unsigned long *journal_devnum,
1900 unsigned int *journal_ioprio,
1903 struct ext4_sb_info *sbi = EXT4_SB(sb);
1905 substring_t args[MAX_OPT_ARGS];
1911 while ((p = strsep(&options, ",")) != NULL) {
1915 * Initialize args struct so we know whether arg was
1916 * found; some options take optional arguments.
1918 args[0].to = args[0].from = NULL;
1919 token = match_token(p, tokens, args);
1920 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1921 journal_ioprio, is_remount) < 0)
1926 * We do the test below only for project quotas. 'usrquota' and
1927 * 'grpquota' mount options are allowed even without quota feature
1928 * to support legacy quotas in quota files.
1930 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
1931 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
1932 "Cannot enable project quota enforcement.");
1935 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1936 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1937 clear_opt(sb, USRQUOTA);
1939 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1940 clear_opt(sb, GRPQUOTA);
1942 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1943 ext4_msg(sb, KERN_ERR, "old and new quota "
1948 if (!sbi->s_jquota_fmt) {
1949 ext4_msg(sb, KERN_ERR, "journaled quota format "
1955 if (test_opt(sb, DIOREAD_NOLOCK)) {
1957 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1959 if (blocksize < PAGE_SIZE) {
1960 ext4_msg(sb, KERN_ERR, "can't mount with "
1961 "dioread_nolock if block size != PAGE_SIZE");
1968 static inline void ext4_show_quota_options(struct seq_file *seq,
1969 struct super_block *sb)
1971 #if defined(CONFIG_QUOTA)
1972 struct ext4_sb_info *sbi = EXT4_SB(sb);
1974 if (sbi->s_jquota_fmt) {
1977 switch (sbi->s_jquota_fmt) {
1988 seq_printf(seq, ",jqfmt=%s", fmtname);
1991 if (sbi->s_qf_names[USRQUOTA])
1992 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
1994 if (sbi->s_qf_names[GRPQUOTA])
1995 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
1999 static const char *token2str(int token)
2001 const struct match_token *t;
2003 for (t = tokens; t->token != Opt_err; t++)
2004 if (t->token == token && !strchr(t->pattern, '='))
2011 * - it's set to a non-default value OR
2012 * - if the per-sb default is different from the global default
2014 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2017 struct ext4_sb_info *sbi = EXT4_SB(sb);
2018 struct ext4_super_block *es = sbi->s_es;
2019 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
2020 const struct mount_opts *m;
2021 char sep = nodefs ? '\n' : ',';
2023 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2024 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2026 if (sbi->s_sb_block != 1)
2027 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2029 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2030 int want_set = m->flags & MOPT_SET;
2031 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2032 (m->flags & MOPT_CLEAR_ERR))
2034 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
2035 continue; /* skip if same as the default */
2037 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2038 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2039 continue; /* select Opt_noFoo vs Opt_Foo */
2040 SEQ_OPTS_PRINT("%s", token2str(m->token));
2043 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
2044 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
2045 SEQ_OPTS_PRINT("resuid=%u",
2046 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2047 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
2048 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
2049 SEQ_OPTS_PRINT("resgid=%u",
2050 from_kgid_munged(&init_user_ns, sbi->s_resgid));
2051 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
2052 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2053 SEQ_OPTS_PUTS("errors=remount-ro");
2054 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
2055 SEQ_OPTS_PUTS("errors=continue");
2056 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
2057 SEQ_OPTS_PUTS("errors=panic");
2058 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
2059 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
2060 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
2061 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
2062 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
2063 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2064 if (sb->s_flags & SB_I_VERSION)
2065 SEQ_OPTS_PUTS("i_version");
2066 if (nodefs || sbi->s_stripe)
2067 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
2068 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
2069 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2070 SEQ_OPTS_PUTS("data=journal");
2071 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2072 SEQ_OPTS_PUTS("data=ordered");
2073 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2074 SEQ_OPTS_PUTS("data=writeback");
2077 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
2078 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2079 sbi->s_inode_readahead_blks);
2081 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
2082 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
2083 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2084 if (nodefs || sbi->s_max_dir_size_kb)
2085 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2086 if (test_opt(sb, DATA_ERR_ABORT))
2087 SEQ_OPTS_PUTS("data_err=abort");
2089 ext4_show_quota_options(seq, sb);
2093 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2095 return _ext4_show_options(seq, root->d_sb, 0);
2098 int ext4_seq_options_show(struct seq_file *seq, void *offset)
2100 struct super_block *sb = seq->private;
2103 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
2104 rc = _ext4_show_options(seq, sb, 1);
2105 seq_puts(seq, "\n");
2109 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
2112 struct ext4_sb_info *sbi = EXT4_SB(sb);
2115 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2116 ext4_msg(sb, KERN_ERR, "revision level too high, "
2117 "forcing read-only mode");
2122 if (!(sbi->s_mount_state & EXT4_VALID_FS))
2123 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2124 "running e2fsck is recommended");
2125 else if (sbi->s_mount_state & EXT4_ERROR_FS)
2126 ext4_msg(sb, KERN_WARNING,
2127 "warning: mounting fs with errors, "
2128 "running e2fsck is recommended");
2129 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
2130 le16_to_cpu(es->s_mnt_count) >=
2131 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2132 ext4_msg(sb, KERN_WARNING,
2133 "warning: maximal mount count reached, "
2134 "running e2fsck is recommended");
2135 else if (le32_to_cpu(es->s_checkinterval) &&
2136 (le32_to_cpu(es->s_lastcheck) +
2137 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
2138 ext4_msg(sb, KERN_WARNING,
2139 "warning: checktime reached, "
2140 "running e2fsck is recommended");
2141 if (!sbi->s_journal)
2142 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
2143 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
2144 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
2145 le16_add_cpu(&es->s_mnt_count, 1);
2146 es->s_mtime = cpu_to_le32(get_seconds());
2147 ext4_update_dynamic_rev(sb);
2149 ext4_set_feature_journal_needs_recovery(sb);
2151 ext4_commit_super(sb, 1);
2153 if (test_opt(sb, DEBUG))
2154 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
2155 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2157 sbi->s_groups_count,
2158 EXT4_BLOCKS_PER_GROUP(sb),
2159 EXT4_INODES_PER_GROUP(sb),
2160 sbi->s_mount_opt, sbi->s_mount_opt2);
2162 cleancache_init_fs(sb);
2166 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2168 struct ext4_sb_info *sbi = EXT4_SB(sb);
2169 struct flex_groups *new_groups;
2172 if (!sbi->s_log_groups_per_flex)
2175 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2176 if (size <= sbi->s_flex_groups_allocated)
2179 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
2180 new_groups = kvzalloc(size, GFP_KERNEL);
2182 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2183 size / (int) sizeof(struct flex_groups));
2187 if (sbi->s_flex_groups) {
2188 memcpy(new_groups, sbi->s_flex_groups,
2189 (sbi->s_flex_groups_allocated *
2190 sizeof(struct flex_groups)));
2191 kvfree(sbi->s_flex_groups);
2193 sbi->s_flex_groups = new_groups;
2194 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2198 static int ext4_fill_flex_info(struct super_block *sb)
2200 struct ext4_sb_info *sbi = EXT4_SB(sb);
2201 struct ext4_group_desc *gdp = NULL;
2202 ext4_group_t flex_group;
2205 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2206 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2207 sbi->s_log_groups_per_flex = 0;
2211 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2215 for (i = 0; i < sbi->s_groups_count; i++) {
2216 gdp = ext4_get_group_desc(sb, i, NULL);
2218 flex_group = ext4_flex_group(sbi, i);
2219 atomic_add(ext4_free_inodes_count(sb, gdp),
2220 &sbi->s_flex_groups[flex_group].free_inodes);
2221 atomic64_add(ext4_free_group_clusters(sb, gdp),
2222 &sbi->s_flex_groups[flex_group].free_clusters);
2223 atomic_add(ext4_used_dirs_count(sb, gdp),
2224 &sbi->s_flex_groups[flex_group].used_dirs);
2232 static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2233 struct ext4_group_desc *gdp)
2235 int offset = offsetof(struct ext4_group_desc, bg_checksum);
2237 __le32 le_group = cpu_to_le32(block_group);
2238 struct ext4_sb_info *sbi = EXT4_SB(sb);
2240 if (ext4_has_metadata_csum(sbi->s_sb)) {
2241 /* Use new metadata_csum algorithm */
2243 __u16 dummy_csum = 0;
2245 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2247 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2248 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2249 sizeof(dummy_csum));
2250 offset += sizeof(dummy_csum);
2251 if (offset < sbi->s_desc_size)
2252 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2253 sbi->s_desc_size - offset);
2255 crc = csum32 & 0xFFFF;
2259 /* old crc16 code */
2260 if (!ext4_has_feature_gdt_csum(sb))
2263 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2264 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2265 crc = crc16(crc, (__u8 *)gdp, offset);
2266 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2267 /* for checksum of struct ext4_group_desc do the rest...*/
2268 if (ext4_has_feature_64bit(sb) &&
2269 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2270 crc = crc16(crc, (__u8 *)gdp + offset,
2271 le16_to_cpu(sbi->s_es->s_desc_size) -
2275 return cpu_to_le16(crc);
2278 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2279 struct ext4_group_desc *gdp)
2281 if (ext4_has_group_desc_csum(sb) &&
2282 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
2288 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2289 struct ext4_group_desc *gdp)
2291 if (!ext4_has_group_desc_csum(sb))
2293 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2296 /* Called at mount-time, super-block is locked */
2297 static int ext4_check_descriptors(struct super_block *sb,
2298 ext4_fsblk_t sb_block,
2299 ext4_group_t *first_not_zeroed)
2301 struct ext4_sb_info *sbi = EXT4_SB(sb);
2302 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2303 ext4_fsblk_t last_block;
2304 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0) + 1;
2305 ext4_fsblk_t block_bitmap;
2306 ext4_fsblk_t inode_bitmap;
2307 ext4_fsblk_t inode_table;
2308 int flexbg_flag = 0;
2309 ext4_group_t i, grp = sbi->s_groups_count;
2311 if (ext4_has_feature_flex_bg(sb))
2314 ext4_debug("Checking group descriptors");
2316 for (i = 0; i < sbi->s_groups_count; i++) {
2317 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2319 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2320 last_block = ext4_blocks_count(sbi->s_es) - 1;
2322 last_block = first_block +
2323 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2325 if ((grp == sbi->s_groups_count) &&
2326 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2329 block_bitmap = ext4_block_bitmap(sb, gdp);
2330 if (block_bitmap == sb_block) {
2331 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2332 "Block bitmap for group %u overlaps "
2337 if (block_bitmap >= sb_block + 1 &&
2338 block_bitmap <= last_bg_block) {
2339 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2340 "Block bitmap for group %u overlaps "
2341 "block group descriptors", i);
2345 if (block_bitmap < first_block || block_bitmap > last_block) {
2346 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2347 "Block bitmap for group %u not in group "
2348 "(block %llu)!", i, block_bitmap);
2351 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2352 if (inode_bitmap == sb_block) {
2353 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2354 "Inode bitmap for group %u overlaps "
2359 if (inode_bitmap >= sb_block + 1 &&
2360 inode_bitmap <= last_bg_block) {
2361 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2362 "Inode bitmap for group %u overlaps "
2363 "block group descriptors", i);
2367 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2368 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2369 "Inode bitmap for group %u not in group "
2370 "(block %llu)!", i, inode_bitmap);
2373 inode_table = ext4_inode_table(sb, gdp);
2374 if (inode_table == sb_block) {
2375 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2376 "Inode table for group %u overlaps "
2381 if (inode_table >= sb_block + 1 &&
2382 inode_table <= last_bg_block) {
2383 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2384 "Inode table for group %u overlaps "
2385 "block group descriptors", i);
2389 if (inode_table < first_block ||
2390 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2391 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2392 "Inode table for group %u not in group "
2393 "(block %llu)!", i, inode_table);
2396 ext4_lock_group(sb, i);
2397 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2398 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2399 "Checksum for group %u failed (%u!=%u)",
2400 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2401 gdp)), le16_to_cpu(gdp->bg_checksum));
2402 if (!sb_rdonly(sb)) {
2403 ext4_unlock_group(sb, i);
2407 ext4_unlock_group(sb, i);
2409 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2411 if (NULL != first_not_zeroed)
2412 *first_not_zeroed = grp;
2416 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2417 * the superblock) which were deleted from all directories, but held open by
2418 * a process at the time of a crash. We walk the list and try to delete these
2419 * inodes at recovery time (only with a read-write filesystem).
2421 * In order to keep the orphan inode chain consistent during traversal (in
2422 * case of crash during recovery), we link each inode into the superblock
2423 * orphan list_head and handle it the same way as an inode deletion during
2424 * normal operation (which journals the operations for us).
2426 * We only do an iget() and an iput() on each inode, which is very safe if we
2427 * accidentally point at an in-use or already deleted inode. The worst that
2428 * can happen in this case is that we get a "bit already cleared" message from
2429 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2430 * e2fsck was run on this filesystem, and it must have already done the orphan
2431 * inode cleanup for us, so we can safely abort without any further action.
2433 static void ext4_orphan_cleanup(struct super_block *sb,
2434 struct ext4_super_block *es)
2436 unsigned int s_flags = sb->s_flags;
2437 int ret, nr_orphans = 0, nr_truncates = 0;
2439 int quota_update = 0;
2442 if (!es->s_last_orphan) {
2443 jbd_debug(4, "no orphan inodes to clean up\n");
2447 if (bdev_read_only(sb->s_bdev)) {
2448 ext4_msg(sb, KERN_ERR, "write access "
2449 "unavailable, skipping orphan cleanup");
2453 /* Check if feature set would not allow a r/w mount */
2454 if (!ext4_feature_set_ok(sb, 0)) {
2455 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2456 "unknown ROCOMPAT features");
2460 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2461 /* don't clear list on RO mount w/ errors */
2462 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2463 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2464 "clearing orphan list.\n");
2465 es->s_last_orphan = 0;
2467 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2471 if (s_flags & MS_RDONLY) {
2472 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2473 sb->s_flags &= ~MS_RDONLY;
2476 /* Needed for iput() to work correctly and not trash data */
2477 sb->s_flags |= MS_ACTIVE;
2480 * Turn on quotas which were not enabled for read-only mounts if
2481 * filesystem has quota feature, so that they are updated correctly.
2483 if (ext4_has_feature_quota(sb) && (s_flags & MS_RDONLY)) {
2484 int ret = ext4_enable_quotas(sb);
2489 ext4_msg(sb, KERN_ERR,
2490 "Cannot turn on quotas: error %d", ret);
2493 /* Turn on journaled quotas used for old sytle */
2494 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2495 if (EXT4_SB(sb)->s_qf_names[i]) {
2496 int ret = ext4_quota_on_mount(sb, i);
2501 ext4_msg(sb, KERN_ERR,
2502 "Cannot turn on journaled "
2503 "quota: type %d: error %d", i, ret);
2508 while (es->s_last_orphan) {
2509 struct inode *inode;
2512 * We may have encountered an error during cleanup; if
2513 * so, skip the rest.
2515 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2516 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2517 es->s_last_orphan = 0;
2521 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2522 if (IS_ERR(inode)) {
2523 es->s_last_orphan = 0;
2527 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2528 dquot_initialize(inode);
2529 if (inode->i_nlink) {
2530 if (test_opt(sb, DEBUG))
2531 ext4_msg(sb, KERN_DEBUG,
2532 "%s: truncating inode %lu to %lld bytes",
2533 __func__, inode->i_ino, inode->i_size);
2534 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2535 inode->i_ino, inode->i_size);
2537 truncate_inode_pages(inode->i_mapping, inode->i_size);
2538 ret = ext4_truncate(inode);
2540 ext4_std_error(inode->i_sb, ret);
2541 inode_unlock(inode);
2544 if (test_opt(sb, DEBUG))
2545 ext4_msg(sb, KERN_DEBUG,
2546 "%s: deleting unreferenced inode %lu",
2547 __func__, inode->i_ino);
2548 jbd_debug(2, "deleting unreferenced inode %lu\n",
2552 iput(inode); /* The delete magic happens here! */
2555 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2558 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2559 PLURAL(nr_orphans));
2561 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2562 PLURAL(nr_truncates));
2564 /* Turn off quotas if they were enabled for orphan cleanup */
2566 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2567 if (sb_dqopt(sb)->files[i])
2568 dquot_quota_off(sb, i);
2572 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2576 * Maximal extent format file size.
2577 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2578 * extent format containers, within a sector_t, and within i_blocks
2579 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2580 * so that won't be a limiting factor.
2582 * However there is other limiting factor. We do store extents in the form
2583 * of starting block and length, hence the resulting length of the extent
2584 * covering maximum file size must fit into on-disk format containers as
2585 * well. Given that length is always by 1 unit bigger than max unit (because
2586 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2588 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2590 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2593 loff_t upper_limit = MAX_LFS_FILESIZE;
2595 /* small i_blocks in vfs inode? */
2596 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2598 * CONFIG_LBDAF is not enabled implies the inode
2599 * i_block represent total blocks in 512 bytes
2600 * 32 == size of vfs inode i_blocks * 8
2602 upper_limit = (1LL << 32) - 1;
2604 /* total blocks in file system block size */
2605 upper_limit >>= (blkbits - 9);
2606 upper_limit <<= blkbits;
2610 * 32-bit extent-start container, ee_block. We lower the maxbytes
2611 * by one fs block, so ee_len can cover the extent of maximum file
2614 res = (1LL << 32) - 1;
2617 /* Sanity check against vm- & vfs- imposed limits */
2618 if (res > upper_limit)
2625 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2626 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2627 * We need to be 1 filesystem block less than the 2^48 sector limit.
2629 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2631 loff_t res = EXT4_NDIR_BLOCKS;
2634 /* This is calculated to be the largest file size for a dense, block
2635 * mapped file such that the file's total number of 512-byte sectors,
2636 * including data and all indirect blocks, does not exceed (2^48 - 1).
2638 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2639 * number of 512-byte sectors of the file.
2642 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2644 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2645 * the inode i_block field represents total file blocks in
2646 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2648 upper_limit = (1LL << 32) - 1;
2650 /* total blocks in file system block size */
2651 upper_limit >>= (bits - 9);
2655 * We use 48 bit ext4_inode i_blocks
2656 * With EXT4_HUGE_FILE_FL set the i_blocks
2657 * represent total number of blocks in
2658 * file system block size
2660 upper_limit = (1LL << 48) - 1;
2664 /* indirect blocks */
2666 /* double indirect blocks */
2667 meta_blocks += 1 + (1LL << (bits-2));
2668 /* tripple indirect blocks */
2669 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2671 upper_limit -= meta_blocks;
2672 upper_limit <<= bits;
2674 res += 1LL << (bits-2);
2675 res += 1LL << (2*(bits-2));
2676 res += 1LL << (3*(bits-2));
2678 if (res > upper_limit)
2681 if (res > MAX_LFS_FILESIZE)
2682 res = MAX_LFS_FILESIZE;
2687 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2688 ext4_fsblk_t logical_sb_block, int nr)
2690 struct ext4_sb_info *sbi = EXT4_SB(sb);
2691 ext4_group_t bg, first_meta_bg;
2694 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2696 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
2697 return logical_sb_block + nr + 1;
2698 bg = sbi->s_desc_per_block * nr;
2699 if (ext4_bg_has_super(sb, bg))
2703 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2704 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2705 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2708 if (sb->s_blocksize == 1024 && nr == 0 &&
2709 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2712 return (has_super + ext4_group_first_block_no(sb, bg));
2716 * ext4_get_stripe_size: Get the stripe size.
2717 * @sbi: In memory super block info
2719 * If we have specified it via mount option, then
2720 * use the mount option value. If the value specified at mount time is
2721 * greater than the blocks per group use the super block value.
2722 * If the super block value is greater than blocks per group return 0.
2723 * Allocator needs it be less than blocks per group.
2726 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2728 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2729 unsigned long stripe_width =
2730 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2733 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2734 ret = sbi->s_stripe;
2735 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
2737 else if (stride && stride <= sbi->s_blocks_per_group)
2743 * If the stripe width is 1, this makes no sense and
2744 * we set it to 0 to turn off stripe handling code.
2753 * Check whether this filesystem can be mounted based on
2754 * the features present and the RDONLY/RDWR mount requested.
2755 * Returns 1 if this filesystem can be mounted as requested,
2756 * 0 if it cannot be.
2758 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2760 if (ext4_has_unknown_ext4_incompat_features(sb)) {
2761 ext4_msg(sb, KERN_ERR,
2762 "Couldn't mount because of "
2763 "unsupported optional features (%x)",
2764 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2765 ~EXT4_FEATURE_INCOMPAT_SUPP));
2772 if (ext4_has_feature_readonly(sb)) {
2773 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2774 sb->s_flags |= MS_RDONLY;
2778 /* Check that feature set is OK for a read-write mount */
2779 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
2780 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2781 "unsupported optional features (%x)",
2782 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2783 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2787 * Large file size enabled file system can only be mounted
2788 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2790 if (ext4_has_feature_huge_file(sb)) {
2791 if (sizeof(blkcnt_t) < sizeof(u64)) {
2792 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2793 "cannot be mounted RDWR without "
2798 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
2799 ext4_msg(sb, KERN_ERR,
2800 "Can't support bigalloc feature without "
2801 "extents feature\n");
2805 #ifndef CONFIG_QUOTA
2806 if (ext4_has_feature_quota(sb) && !readonly) {
2807 ext4_msg(sb, KERN_ERR,
2808 "Filesystem with quota feature cannot be mounted RDWR "
2809 "without CONFIG_QUOTA");
2812 if (ext4_has_feature_project(sb) && !readonly) {
2813 ext4_msg(sb, KERN_ERR,
2814 "Filesystem with project quota feature cannot be mounted RDWR "
2815 "without CONFIG_QUOTA");
2818 #endif /* CONFIG_QUOTA */
2823 * This function is called once a day if we have errors logged
2824 * on the file system
2826 static void print_daily_error_info(unsigned long arg)
2828 struct super_block *sb = (struct super_block *) arg;
2829 struct ext4_sb_info *sbi;
2830 struct ext4_super_block *es;
2835 if (es->s_error_count)
2836 /* fsck newer than v1.41.13 is needed to clean this condition. */
2837 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2838 le32_to_cpu(es->s_error_count));
2839 if (es->s_first_error_time) {
2840 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2841 sb->s_id, le32_to_cpu(es->s_first_error_time),
2842 (int) sizeof(es->s_first_error_func),
2843 es->s_first_error_func,
2844 le32_to_cpu(es->s_first_error_line));
2845 if (es->s_first_error_ino)
2846 printk(KERN_CONT ": inode %u",
2847 le32_to_cpu(es->s_first_error_ino));
2848 if (es->s_first_error_block)
2849 printk(KERN_CONT ": block %llu", (unsigned long long)
2850 le64_to_cpu(es->s_first_error_block));
2851 printk(KERN_CONT "\n");
2853 if (es->s_last_error_time) {
2854 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2855 sb->s_id, le32_to_cpu(es->s_last_error_time),
2856 (int) sizeof(es->s_last_error_func),
2857 es->s_last_error_func,
2858 le32_to_cpu(es->s_last_error_line));
2859 if (es->s_last_error_ino)
2860 printk(KERN_CONT ": inode %u",
2861 le32_to_cpu(es->s_last_error_ino));
2862 if (es->s_last_error_block)
2863 printk(KERN_CONT ": block %llu", (unsigned long long)
2864 le64_to_cpu(es->s_last_error_block));
2865 printk(KERN_CONT "\n");
2867 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2870 /* Find next suitable group and run ext4_init_inode_table */
2871 static int ext4_run_li_request(struct ext4_li_request *elr)
2873 struct ext4_group_desc *gdp = NULL;
2874 ext4_group_t group, ngroups;
2875 struct super_block *sb;
2876 unsigned long timeout = 0;
2880 ngroups = EXT4_SB(sb)->s_groups_count;
2882 for (group = elr->lr_next_group; group < ngroups; group++) {
2883 gdp = ext4_get_group_desc(sb, group, NULL);
2889 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2893 if (group >= ngroups)
2898 ret = ext4_init_inode_table(sb, group,
2899 elr->lr_timeout ? 0 : 1);
2900 if (elr->lr_timeout == 0) {
2901 timeout = (jiffies - timeout) *
2902 elr->lr_sbi->s_li_wait_mult;
2903 elr->lr_timeout = timeout;
2905 elr->lr_next_sched = jiffies + elr->lr_timeout;
2906 elr->lr_next_group = group + 1;
2912 * Remove lr_request from the list_request and free the
2913 * request structure. Should be called with li_list_mtx held
2915 static void ext4_remove_li_request(struct ext4_li_request *elr)
2917 struct ext4_sb_info *sbi;
2924 list_del(&elr->lr_request);
2925 sbi->s_li_request = NULL;
2929 static void ext4_unregister_li_request(struct super_block *sb)
2931 mutex_lock(&ext4_li_mtx);
2932 if (!ext4_li_info) {
2933 mutex_unlock(&ext4_li_mtx);
2937 mutex_lock(&ext4_li_info->li_list_mtx);
2938 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2939 mutex_unlock(&ext4_li_info->li_list_mtx);
2940 mutex_unlock(&ext4_li_mtx);
2943 static struct task_struct *ext4_lazyinit_task;
2946 * This is the function where ext4lazyinit thread lives. It walks
2947 * through the request list searching for next scheduled filesystem.
2948 * When such a fs is found, run the lazy initialization request
2949 * (ext4_rn_li_request) and keep track of the time spend in this
2950 * function. Based on that time we compute next schedule time of
2951 * the request. When walking through the list is complete, compute
2952 * next waking time and put itself into sleep.
2954 static int ext4_lazyinit_thread(void *arg)
2956 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2957 struct list_head *pos, *n;
2958 struct ext4_li_request *elr;
2959 unsigned long next_wakeup, cur;
2961 BUG_ON(NULL == eli);
2965 next_wakeup = MAX_JIFFY_OFFSET;
2967 mutex_lock(&eli->li_list_mtx);
2968 if (list_empty(&eli->li_request_list)) {
2969 mutex_unlock(&eli->li_list_mtx);
2972 list_for_each_safe(pos, n, &eli->li_request_list) {
2975 elr = list_entry(pos, struct ext4_li_request,
2978 if (time_before(jiffies, elr->lr_next_sched)) {
2979 if (time_before(elr->lr_next_sched, next_wakeup))
2980 next_wakeup = elr->lr_next_sched;
2983 if (down_read_trylock(&elr->lr_super->s_umount)) {
2984 if (sb_start_write_trylock(elr->lr_super)) {
2987 * We hold sb->s_umount, sb can not
2988 * be removed from the list, it is
2989 * now safe to drop li_list_mtx
2991 mutex_unlock(&eli->li_list_mtx);
2992 err = ext4_run_li_request(elr);
2993 sb_end_write(elr->lr_super);
2994 mutex_lock(&eli->li_list_mtx);
2997 up_read((&elr->lr_super->s_umount));
2999 /* error, remove the lazy_init job */
3001 ext4_remove_li_request(elr);
3005 elr->lr_next_sched = jiffies +
3007 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3009 if (time_before(elr->lr_next_sched, next_wakeup))
3010 next_wakeup = elr->lr_next_sched;
3012 mutex_unlock(&eli->li_list_mtx);
3017 if ((time_after_eq(cur, next_wakeup)) ||
3018 (MAX_JIFFY_OFFSET == next_wakeup)) {
3023 schedule_timeout_interruptible(next_wakeup - cur);
3025 if (kthread_should_stop()) {
3026 ext4_clear_request_list();
3033 * It looks like the request list is empty, but we need
3034 * to check it under the li_list_mtx lock, to prevent any
3035 * additions into it, and of course we should lock ext4_li_mtx
3036 * to atomically free the list and ext4_li_info, because at
3037 * this point another ext4 filesystem could be registering
3040 mutex_lock(&ext4_li_mtx);
3041 mutex_lock(&eli->li_list_mtx);
3042 if (!list_empty(&eli->li_request_list)) {
3043 mutex_unlock(&eli->li_list_mtx);
3044 mutex_unlock(&ext4_li_mtx);
3047 mutex_unlock(&eli->li_list_mtx);
3048 kfree(ext4_li_info);
3049 ext4_li_info = NULL;
3050 mutex_unlock(&ext4_li_mtx);
3055 static void ext4_clear_request_list(void)
3057 struct list_head *pos, *n;
3058 struct ext4_li_request *elr;
3060 mutex_lock(&ext4_li_info->li_list_mtx);
3061 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3062 elr = list_entry(pos, struct ext4_li_request,
3064 ext4_remove_li_request(elr);
3066 mutex_unlock(&ext4_li_info->li_list_mtx);
3069 static int ext4_run_lazyinit_thread(void)
3071 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3072 ext4_li_info, "ext4lazyinit");
3073 if (IS_ERR(ext4_lazyinit_task)) {
3074 int err = PTR_ERR(ext4_lazyinit_task);
3075 ext4_clear_request_list();
3076 kfree(ext4_li_info);
3077 ext4_li_info = NULL;
3078 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3079 "initialization thread\n",
3083 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3088 * Check whether it make sense to run itable init. thread or not.
3089 * If there is at least one uninitialized inode table, return
3090 * corresponding group number, else the loop goes through all
3091 * groups and return total number of groups.
3093 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3095 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3096 struct ext4_group_desc *gdp = NULL;
3098 if (!ext4_has_group_desc_csum(sb))
3101 for (group = 0; group < ngroups; group++) {
3102 gdp = ext4_get_group_desc(sb, group, NULL);
3106 if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))
3110 ext4_error(sb, "Inode table for bg 0 marked as "
3119 static int ext4_li_info_new(void)
3121 struct ext4_lazy_init *eli = NULL;
3123 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3127 INIT_LIST_HEAD(&eli->li_request_list);
3128 mutex_init(&eli->li_list_mtx);
3130 eli->li_state |= EXT4_LAZYINIT_QUIT;
3137 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3140 struct ext4_sb_info *sbi = EXT4_SB(sb);
3141 struct ext4_li_request *elr;
3143 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3149 elr->lr_next_group = start;
3152 * Randomize first schedule time of the request to
3153 * spread the inode table initialization requests
3156 elr->lr_next_sched = jiffies + (prandom_u32() %
3157 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3161 int ext4_register_li_request(struct super_block *sb,
3162 ext4_group_t first_not_zeroed)
3164 struct ext4_sb_info *sbi = EXT4_SB(sb);
3165 struct ext4_li_request *elr = NULL;
3166 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3169 mutex_lock(&ext4_li_mtx);
3170 if (sbi->s_li_request != NULL) {
3172 * Reset timeout so it can be computed again, because
3173 * s_li_wait_mult might have changed.
3175 sbi->s_li_request->lr_timeout = 0;
3179 if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
3180 !test_opt(sb, INIT_INODE_TABLE))
3183 elr = ext4_li_request_new(sb, first_not_zeroed);
3189 if (NULL == ext4_li_info) {
3190 ret = ext4_li_info_new();
3195 mutex_lock(&ext4_li_info->li_list_mtx);
3196 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3197 mutex_unlock(&ext4_li_info->li_list_mtx);
3199 sbi->s_li_request = elr;
3201 * set elr to NULL here since it has been inserted to
3202 * the request_list and the removal and free of it is
3203 * handled by ext4_clear_request_list from now on.
3207 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3208 ret = ext4_run_lazyinit_thread();
3213 mutex_unlock(&ext4_li_mtx);
3220 * We do not need to lock anything since this is called on
3223 static void ext4_destroy_lazyinit_thread(void)
3226 * If thread exited earlier
3227 * there's nothing to be done.
3229 if (!ext4_li_info || !ext4_lazyinit_task)
3232 kthread_stop(ext4_lazyinit_task);
3235 static int set_journal_csum_feature_set(struct super_block *sb)
3238 int compat, incompat;
3239 struct ext4_sb_info *sbi = EXT4_SB(sb);
3241 if (ext4_has_metadata_csum(sb)) {
3242 /* journal checksum v3 */
3244 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
3246 /* journal checksum v1 */
3247 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3251 jbd2_journal_clear_features(sbi->s_journal,
3252 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3253 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3254 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3255 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3256 ret = jbd2_journal_set_features(sbi->s_journal,
3258 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3260 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3261 ret = jbd2_journal_set_features(sbi->s_journal,
3264 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3265 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3267 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3268 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3275 * Note: calculating the overhead so we can be compatible with
3276 * historical BSD practice is quite difficult in the face of
3277 * clusters/bigalloc. This is because multiple metadata blocks from
3278 * different block group can end up in the same allocation cluster.
3279 * Calculating the exact overhead in the face of clustered allocation
3280 * requires either O(all block bitmaps) in memory or O(number of block
3281 * groups**2) in time. We will still calculate the superblock for
3282 * older file systems --- and if we come across with a bigalloc file
3283 * system with zero in s_overhead_clusters the estimate will be close to
3284 * correct especially for very large cluster sizes --- but for newer
3285 * file systems, it's better to calculate this figure once at mkfs
3286 * time, and store it in the superblock. If the superblock value is
3287 * present (even for non-bigalloc file systems), we will use it.
3289 static int count_overhead(struct super_block *sb, ext4_group_t grp,
3292 struct ext4_sb_info *sbi = EXT4_SB(sb);
3293 struct ext4_group_desc *gdp;
3294 ext4_fsblk_t first_block, last_block, b;
3295 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3296 int s, j, count = 0;
3298 if (!ext4_has_feature_bigalloc(sb))
3299 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3300 sbi->s_itb_per_group + 2);
3302 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3303 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3304 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3305 for (i = 0; i < ngroups; i++) {
3306 gdp = ext4_get_group_desc(sb, i, NULL);
3307 b = ext4_block_bitmap(sb, gdp);
3308 if (b >= first_block && b <= last_block) {
3309 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3312 b = ext4_inode_bitmap(sb, gdp);
3313 if (b >= first_block && b <= last_block) {
3314 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3317 b = ext4_inode_table(sb, gdp);
3318 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3319 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3320 int c = EXT4_B2C(sbi, b - first_block);
3321 ext4_set_bit(c, buf);
3327 if (ext4_bg_has_super(sb, grp)) {
3328 ext4_set_bit(s++, buf);
3331 j = ext4_bg_num_gdb(sb, grp);
3332 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3333 ext4_error(sb, "Invalid number of block group "
3334 "descriptor blocks: %d", j);
3335 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
3339 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3343 return EXT4_CLUSTERS_PER_GROUP(sb) -
3344 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3348 * Compute the overhead and stash it in sbi->s_overhead
3350 int ext4_calculate_overhead(struct super_block *sb)
3352 struct ext4_sb_info *sbi = EXT4_SB(sb);
3353 struct ext4_super_block *es = sbi->s_es;
3354 struct inode *j_inode;
3355 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
3356 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3357 ext4_fsblk_t overhead = 0;
3358 char *buf = (char *) get_zeroed_page(GFP_NOFS);
3364 * Compute the overhead (FS structures). This is constant
3365 * for a given filesystem unless the number of block groups
3366 * changes so we cache the previous value until it does.
3370 * All of the blocks before first_data_block are overhead
3372 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3375 * Add the overhead found in each block group
3377 for (i = 0; i < ngroups; i++) {
3380 blks = count_overhead(sb, i, buf);
3383 memset(buf, 0, PAGE_SIZE);
3388 * Add the internal journal blocks whether the journal has been
3391 if (sbi->s_journal && !sbi->journal_bdev)
3392 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3393 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3394 j_inode = ext4_get_journal_inode(sb, j_inum);
3396 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3397 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3400 ext4_msg(sb, KERN_ERR, "can't get journal size");
3403 sbi->s_overhead = overhead;
3405 free_page((unsigned long) buf);
3409 static void ext4_set_resv_clusters(struct super_block *sb)
3411 ext4_fsblk_t resv_clusters;
3412 struct ext4_sb_info *sbi = EXT4_SB(sb);
3415 * There's no need to reserve anything when we aren't using extents.
3416 * The space estimates are exact, there are no unwritten extents,
3417 * hole punching doesn't need new metadata... This is needed especially
3418 * to keep ext2/3 backward compatibility.
3420 if (!ext4_has_feature_extents(sb))
3423 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3424 * This should cover the situations where we can not afford to run
3425 * out of space like for example punch hole, or converting
3426 * unwritten extents in delalloc path. In most cases such
3427 * allocation would require 1, or 2 blocks, higher numbers are
3430 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3431 sbi->s_cluster_bits);
3433 do_div(resv_clusters, 50);
3434 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3436 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
3439 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3441 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
3442 char *orig_data = kstrdup(data, GFP_KERNEL);
3443 struct buffer_head *bh;
3444 struct ext4_super_block *es = NULL;
3445 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3447 ext4_fsblk_t sb_block = get_sb_block(&data);
3448 ext4_fsblk_t logical_sb_block;
3449 unsigned long offset = 0;
3450 unsigned long journal_devnum = 0;
3451 unsigned long def_mount_opts;
3455 int blocksize, clustersize;
3456 unsigned int db_count;
3458 int needs_recovery, has_huge_files, has_bigalloc;
3461 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3462 ext4_group_t first_not_zeroed;
3464 if ((data && !orig_data) || !sbi)
3467 sbi->s_daxdev = dax_dev;
3468 sbi->s_blockgroup_lock =
3469 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3470 if (!sbi->s_blockgroup_lock)
3473 sb->s_fs_info = sbi;
3475 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3476 sbi->s_sb_block = sb_block;
3477 if (sb->s_bdev->bd_part)
3478 sbi->s_sectors_written_start =
3479 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3481 /* Cleanup superblock name */
3482 strreplace(sb->s_id, '/', '!');
3484 /* -EINVAL is default */
3486 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3488 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3493 * The ext4 superblock will not be buffer aligned for other than 1kB
3494 * block sizes. We need to calculate the offset from buffer start.
3496 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3497 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3498 offset = do_div(logical_sb_block, blocksize);
3500 logical_sb_block = sb_block;
3503 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3504 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3508 * Note: s_es must be initialized as soon as possible because
3509 * some ext4 macro-instructions depend on its value
3511 es = (struct ext4_super_block *) (bh->b_data + offset);
3513 sb->s_magic = le16_to_cpu(es->s_magic);
3514 if (sb->s_magic != EXT4_SUPER_MAGIC)
3516 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3518 /* Warn if metadata_csum and gdt_csum are both set. */
3519 if (ext4_has_feature_metadata_csum(sb) &&
3520 ext4_has_feature_gdt_csum(sb))
3521 ext4_warning(sb, "metadata_csum and uninit_bg are "
3522 "redundant flags; please run fsck.");
3524 /* Check for a known checksum algorithm */
3525 if (!ext4_verify_csum_type(sb, es)) {
3526 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3527 "unknown checksum algorithm.");
3532 /* Load the checksum driver */
3533 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3534 if (IS_ERR(sbi->s_chksum_driver)) {
3535 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3536 ret = PTR_ERR(sbi->s_chksum_driver);
3537 sbi->s_chksum_driver = NULL;
3541 /* Check superblock checksum */
3542 if (!ext4_superblock_csum_verify(sb, es)) {
3543 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3544 "invalid superblock checksum. Run e2fsck?");
3550 /* Precompute checksum seed for all metadata */
3551 if (ext4_has_feature_csum_seed(sb))
3552 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3553 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
3554 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3555 sizeof(es->s_uuid));
3557 /* Set defaults before we parse the mount options */
3558 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3559 set_opt(sb, INIT_INODE_TABLE);
3560 if (def_mount_opts & EXT4_DEFM_DEBUG)
3562 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3564 if (def_mount_opts & EXT4_DEFM_UID16)
3565 set_opt(sb, NO_UID32);
3566 /* xattr user namespace & acls are now defaulted on */
3567 set_opt(sb, XATTR_USER);
3568 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3569 set_opt(sb, POSIX_ACL);
3571 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3572 if (ext4_has_metadata_csum(sb))
3573 set_opt(sb, JOURNAL_CHECKSUM);
3575 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3576 set_opt(sb, JOURNAL_DATA);
3577 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3578 set_opt(sb, ORDERED_DATA);
3579 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3580 set_opt(sb, WRITEBACK_DATA);
3582 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3583 set_opt(sb, ERRORS_PANIC);
3584 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3585 set_opt(sb, ERRORS_CONT);
3587 set_opt(sb, ERRORS_RO);
3588 /* block_validity enabled by default; disable with noblock_validity */
3589 set_opt(sb, BLOCK_VALIDITY);
3590 if (def_mount_opts & EXT4_DEFM_DISCARD)
3591 set_opt(sb, DISCARD);
3593 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3594 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3595 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3596 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3597 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3599 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3600 set_opt(sb, BARRIER);
3603 * enable delayed allocation by default
3604 * Use -o nodelalloc to turn it off
3606 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3607 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3608 set_opt(sb, DELALLOC);
3611 * set default s_li_wait_mult for lazyinit, for the case there is
3612 * no mount option specified.
3614 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3616 if (sbi->s_es->s_mount_opts[0]) {
3617 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3618 sizeof(sbi->s_es->s_mount_opts),
3622 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3623 &journal_ioprio, 0)) {
3624 ext4_msg(sb, KERN_WARNING,
3625 "failed to parse options in superblock: %s",
3628 kfree(s_mount_opts);
3630 sbi->s_def_mount_opt = sbi->s_mount_opt;
3631 if (!parse_options((char *) data, sb, &journal_devnum,
3632 &journal_ioprio, 0))
3635 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3636 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3637 "with data=journal disables delayed "
3638 "allocation and O_DIRECT support!\n");
3639 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3640 ext4_msg(sb, KERN_ERR, "can't mount with "
3641 "both data=journal and delalloc");
3644 if (test_opt(sb, DIOREAD_NOLOCK)) {
3645 ext4_msg(sb, KERN_ERR, "can't mount with "
3646 "both data=journal and dioread_nolock");
3649 if (test_opt(sb, DAX)) {
3650 ext4_msg(sb, KERN_ERR, "can't mount with "
3651 "both data=journal and dax");
3654 if (ext4_has_feature_encrypt(sb)) {
3655 ext4_msg(sb, KERN_WARNING,
3656 "encrypted files will use data=ordered "
3657 "instead of data journaling mode");
3659 if (test_opt(sb, DELALLOC))
3660 clear_opt(sb, DELALLOC);
3662 sb->s_iflags |= SB_I_CGROUPWB;
3665 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3666 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3668 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3669 (ext4_has_compat_features(sb) ||
3670 ext4_has_ro_compat_features(sb) ||
3671 ext4_has_incompat_features(sb)))
3672 ext4_msg(sb, KERN_WARNING,
3673 "feature flags set on rev 0 fs, "
3674 "running e2fsck is recommended");
3676 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3677 set_opt2(sb, HURD_COMPAT);
3678 if (ext4_has_feature_64bit(sb)) {
3679 ext4_msg(sb, KERN_ERR,
3680 "The Hurd can't support 64-bit file systems");
3685 * ea_inode feature uses l_i_version field which is not
3686 * available in HURD_COMPAT mode.
3688 if (ext4_has_feature_ea_inode(sb)) {
3689 ext4_msg(sb, KERN_ERR,
3690 "ea_inode feature is not supported for Hurd");
3695 if (IS_EXT2_SB(sb)) {
3696 if (ext2_feature_set_ok(sb))
3697 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3698 "using the ext4 subsystem");
3701 * If we're probing be silent, if this looks like
3702 * it's actually an ext[34] filesystem.
3704 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3706 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3707 "to feature incompatibilities");
3712 if (IS_EXT3_SB(sb)) {
3713 if (ext3_feature_set_ok(sb))
3714 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3715 "using the ext4 subsystem");
3718 * If we're probing be silent, if this looks like
3719 * it's actually an ext4 filesystem.
3721 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3723 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3724 "to feature incompatibilities");
3730 * Check feature flags regardless of the revision level, since we
3731 * previously didn't change the revision level when setting the flags,
3732 * so there is a chance incompat flags are set on a rev 0 filesystem.
3734 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
3737 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3738 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3739 blocksize > EXT4_MAX_BLOCK_SIZE) {
3740 ext4_msg(sb, KERN_ERR,
3741 "Unsupported filesystem blocksize %d (%d log_block_size)",
3742 blocksize, le32_to_cpu(es->s_log_block_size));
3745 if (le32_to_cpu(es->s_log_block_size) >
3746 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3747 ext4_msg(sb, KERN_ERR,
3748 "Invalid log block size: %u",
3749 le32_to_cpu(es->s_log_block_size));
3753 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3754 ext4_msg(sb, KERN_ERR,
3755 "Number of reserved GDT blocks insanely large: %d",
3756 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3760 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3761 if (ext4_has_feature_inline_data(sb)) {
3762 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
3763 " that may contain inline data");
3766 err = bdev_dax_supported(sb, blocksize);
3771 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
3772 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3773 es->s_encryption_level);
3777 if (sb->s_blocksize != blocksize) {
3778 /* Validate the filesystem blocksize */
3779 if (!sb_set_blocksize(sb, blocksize)) {
3780 ext4_msg(sb, KERN_ERR, "bad block size %d",
3786 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3787 offset = do_div(logical_sb_block, blocksize);
3788 bh = sb_bread_unmovable(sb, logical_sb_block);
3790 ext4_msg(sb, KERN_ERR,
3791 "Can't read superblock on 2nd try");
3794 es = (struct ext4_super_block *)(bh->b_data + offset);
3796 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3797 ext4_msg(sb, KERN_ERR,
3798 "Magic mismatch, very weird!");
3803 has_huge_files = ext4_has_feature_huge_file(sb);
3804 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3806 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3808 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3809 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3810 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3812 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3813 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3814 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3815 (!is_power_of_2(sbi->s_inode_size)) ||
3816 (sbi->s_inode_size > blocksize)) {
3817 ext4_msg(sb, KERN_ERR,
3818 "unsupported inode size: %d",
3822 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3823 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3826 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3827 if (ext4_has_feature_64bit(sb)) {
3828 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3829 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3830 !is_power_of_2(sbi->s_desc_size)) {
3831 ext4_msg(sb, KERN_ERR,
3832 "unsupported descriptor size %lu",
3837 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3839 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3840 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3842 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3843 if (sbi->s_inodes_per_block == 0)
3845 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
3846 sbi->s_inodes_per_group > blocksize * 8) {
3847 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
3848 sbi->s_blocks_per_group);
3851 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3852 sbi->s_inodes_per_block;
3853 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3855 sbi->s_mount_state = le16_to_cpu(es->s_state);
3856 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3857 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3859 for (i = 0; i < 4; i++)
3860 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3861 sbi->s_def_hash_version = es->s_def_hash_version;
3862 if (ext4_has_feature_dir_index(sb)) {
3863 i = le32_to_cpu(es->s_flags);
3864 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3865 sbi->s_hash_unsigned = 3;
3866 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3867 #ifdef __CHAR_UNSIGNED__
3870 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3871 sbi->s_hash_unsigned = 3;
3875 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3880 /* Handle clustersize */
3881 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3882 has_bigalloc = ext4_has_feature_bigalloc(sb);
3884 if (clustersize < blocksize) {
3885 ext4_msg(sb, KERN_ERR,
3886 "cluster size (%d) smaller than "
3887 "block size (%d)", clustersize, blocksize);
3890 if (le32_to_cpu(es->s_log_cluster_size) >
3891 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3892 ext4_msg(sb, KERN_ERR,
3893 "Invalid log cluster size: %u",
3894 le32_to_cpu(es->s_log_cluster_size));
3897 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3898 le32_to_cpu(es->s_log_block_size);
3899 sbi->s_clusters_per_group =
3900 le32_to_cpu(es->s_clusters_per_group);
3901 if (sbi->s_clusters_per_group > blocksize * 8) {
3902 ext4_msg(sb, KERN_ERR,
3903 "#clusters per group too big: %lu",
3904 sbi->s_clusters_per_group);
3907 if (sbi->s_blocks_per_group !=
3908 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3909 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3910 "clusters per group (%lu) inconsistent",
3911 sbi->s_blocks_per_group,
3912 sbi->s_clusters_per_group);
3916 if (clustersize != blocksize) {
3917 ext4_warning(sb, "fragment/cluster size (%d) != "
3918 "block size (%d)", clustersize,
3920 clustersize = blocksize;
3922 if (sbi->s_blocks_per_group > blocksize * 8) {
3923 ext4_msg(sb, KERN_ERR,
3924 "#blocks per group too big: %lu",
3925 sbi->s_blocks_per_group);
3928 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3929 sbi->s_cluster_bits = 0;
3931 sbi->s_cluster_ratio = clustersize / blocksize;
3933 /* Do we have standard group size of clustersize * 8 blocks ? */
3934 if (sbi->s_blocks_per_group == clustersize << 3)
3935 set_opt2(sb, STD_GROUP_SIZE);
3938 * Test whether we have more sectors than will fit in sector_t,
3939 * and whether the max offset is addressable by the page cache.
3941 err = generic_check_addressable(sb->s_blocksize_bits,
3942 ext4_blocks_count(es));
3944 ext4_msg(sb, KERN_ERR, "filesystem"
3945 " too large to mount safely on this system");
3946 if (sizeof(sector_t) < 8)
3947 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3951 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3954 /* check blocks count against device size */
3955 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3956 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3957 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3958 "exceeds size of device (%llu blocks)",
3959 ext4_blocks_count(es), blocks_count);
3964 * It makes no sense for the first data block to be beyond the end
3965 * of the filesystem.
3967 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3968 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3969 "block %u is beyond end of filesystem (%llu)",
3970 le32_to_cpu(es->s_first_data_block),
3971 ext4_blocks_count(es));
3974 blocks_count = (ext4_blocks_count(es) -
3975 le32_to_cpu(es->s_first_data_block) +
3976 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3977 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3978 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3979 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3980 "(block count %llu, first data block %u, "
3981 "blocks per group %lu)", sbi->s_groups_count,
3982 ext4_blocks_count(es),
3983 le32_to_cpu(es->s_first_data_block),
3984 EXT4_BLOCKS_PER_GROUP(sb));
3987 sbi->s_groups_count = blocks_count;
3988 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3989 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3990 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3991 EXT4_DESC_PER_BLOCK(sb);
3992 if (ext4_has_feature_meta_bg(sb)) {
3993 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3994 ext4_msg(sb, KERN_WARNING,
3995 "first meta block group too large: %u "
3996 "(group descriptor block count %u)",
3997 le32_to_cpu(es->s_first_meta_bg), db_count);
4001 sbi->s_group_desc = kvmalloc(db_count *
4002 sizeof(struct buffer_head *),
4004 if (sbi->s_group_desc == NULL) {
4005 ext4_msg(sb, KERN_ERR, "not enough memory");
4010 bgl_lock_init(sbi->s_blockgroup_lock);
4012 /* Pre-read the descriptors into the buffer cache */
4013 for (i = 0; i < db_count; i++) {
4014 block = descriptor_loc(sb, logical_sb_block, i);
4015 sb_breadahead(sb, block);
4018 for (i = 0; i < db_count; i++) {
4019 block = descriptor_loc(sb, logical_sb_block, i);
4020 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
4021 if (!sbi->s_group_desc[i]) {
4022 ext4_msg(sb, KERN_ERR,
4023 "can't read group descriptor %d", i);
4028 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
4029 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
4030 ret = -EFSCORRUPTED;
4034 sbi->s_gdb_count = db_count;
4035 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
4036 spin_lock_init(&sbi->s_next_gen_lock);
4038 setup_timer(&sbi->s_err_report, print_daily_error_info,
4039 (unsigned long) sb);
4041 /* Register extent status tree shrinker */
4042 if (ext4_es_register_shrinker(sbi))
4045 sbi->s_stripe = ext4_get_stripe_size(sbi);
4046 sbi->s_extent_max_zeroout_kb = 32;
4049 * set up enough so that it can read an inode
4051 sb->s_op = &ext4_sops;
4052 sb->s_export_op = &ext4_export_ops;
4053 sb->s_xattr = ext4_xattr_handlers;
4054 sb->s_cop = &ext4_cryptops;
4056 sb->dq_op = &ext4_quota_operations;
4057 if (ext4_has_feature_quota(sb))
4058 sb->s_qcop = &dquot_quotactl_sysfile_ops;
4060 sb->s_qcop = &ext4_qctl_operations;
4061 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
4063 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
4065 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
4066 mutex_init(&sbi->s_orphan_lock);
4070 needs_recovery = (es->s_last_orphan != 0 ||
4071 ext4_has_feature_journal_needs_recovery(sb));
4073 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
4074 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
4075 goto failed_mount3a;
4078 * The first inode we look at is the journal inode. Don't try
4079 * root first: it may be modified in the journal!
4081 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4082 err = ext4_load_journal(sb, es, journal_devnum);
4084 goto failed_mount3a;
4085 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
4086 ext4_has_feature_journal_needs_recovery(sb)) {
4087 ext4_msg(sb, KERN_ERR, "required journal recovery "
4088 "suppressed and not mounted read-only");
4089 goto failed_mount_wq;
4091 /* Nojournal mode, all journal mount options are illegal */
4092 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4093 ext4_msg(sb, KERN_ERR, "can't mount with "
4094 "journal_checksum, fs mounted w/o journal");
4095 goto failed_mount_wq;
4097 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4098 ext4_msg(sb, KERN_ERR, "can't mount with "
4099 "journal_async_commit, fs mounted w/o journal");
4100 goto failed_mount_wq;
4102 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4103 ext4_msg(sb, KERN_ERR, "can't mount with "
4104 "commit=%lu, fs mounted w/o journal",
4105 sbi->s_commit_interval / HZ);
4106 goto failed_mount_wq;
4108 if (EXT4_MOUNT_DATA_FLAGS &
4109 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4110 ext4_msg(sb, KERN_ERR, "can't mount with "
4111 "data=, fs mounted w/o journal");
4112 goto failed_mount_wq;
4114 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
4115 clear_opt(sb, JOURNAL_CHECKSUM);
4116 clear_opt(sb, DATA_FLAGS);
4117 sbi->s_journal = NULL;
4122 if (ext4_has_feature_64bit(sb) &&
4123 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4124 JBD2_FEATURE_INCOMPAT_64BIT)) {
4125 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4126 goto failed_mount_wq;
4129 if (!set_journal_csum_feature_set(sb)) {
4130 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4132 goto failed_mount_wq;
4135 /* We have now updated the journal if required, so we can
4136 * validate the data journaling mode. */
4137 switch (test_opt(sb, DATA_FLAGS)) {
4139 /* No mode set, assume a default based on the journal
4140 * capabilities: ORDERED_DATA if the journal can
4141 * cope, else JOURNAL_DATA
4143 if (jbd2_journal_check_available_features
4144 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
4145 set_opt(sb, ORDERED_DATA);
4147 set_opt(sb, JOURNAL_DATA);
4150 case EXT4_MOUNT_ORDERED_DATA:
4151 case EXT4_MOUNT_WRITEBACK_DATA:
4152 if (!jbd2_journal_check_available_features
4153 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4154 ext4_msg(sb, KERN_ERR, "Journal does not support "
4155 "requested data journaling mode");
4156 goto failed_mount_wq;
4162 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4163 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4164 ext4_msg(sb, KERN_ERR, "can't mount with "
4165 "journal_async_commit in data=ordered mode");
4166 goto failed_mount_wq;
4169 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4171 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4174 if (!test_opt(sb, NO_MBCACHE)) {
4175 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4176 if (!sbi->s_ea_block_cache) {
4177 ext4_msg(sb, KERN_ERR,
4178 "Failed to create ea_block_cache");
4179 goto failed_mount_wq;
4182 if (ext4_has_feature_ea_inode(sb)) {
4183 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4184 if (!sbi->s_ea_inode_cache) {
4185 ext4_msg(sb, KERN_ERR,
4186 "Failed to create ea_inode_cache");
4187 goto failed_mount_wq;
4192 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
4193 (blocksize != PAGE_SIZE)) {
4194 ext4_msg(sb, KERN_ERR,
4195 "Unsupported blocksize for fs encryption");
4196 goto failed_mount_wq;
4199 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
4200 !ext4_has_feature_encrypt(sb)) {
4201 ext4_set_feature_encrypt(sb);
4202 ext4_commit_super(sb, 1);
4206 * Get the # of file system overhead blocks from the
4207 * superblock if present.
4209 if (es->s_overhead_clusters)
4210 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4212 err = ext4_calculate_overhead(sb);
4214 goto failed_mount_wq;
4218 * The maximum number of concurrent works can be high and
4219 * concurrency isn't really necessary. Limit it to 1.
4221 EXT4_SB(sb)->rsv_conversion_wq =
4222 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4223 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4224 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
4230 * The jbd2_journal_load will have done any necessary log recovery,
4231 * so we can safely mount the rest of the filesystem now.
4234 root = ext4_iget(sb, EXT4_ROOT_INO);
4236 ext4_msg(sb, KERN_ERR, "get root inode failed");
4237 ret = PTR_ERR(root);
4241 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4242 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
4246 sb->s_root = d_make_root(root);
4248 ext4_msg(sb, KERN_ERR, "get root dentry failed");
4253 if (ext4_setup_super(sb, es, sb_rdonly(sb)))
4254 sb->s_flags |= MS_RDONLY;
4256 /* determine the minimum size of new large inodes, if present */
4257 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE &&
4258 sbi->s_want_extra_isize == 0) {
4259 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4260 EXT4_GOOD_OLD_INODE_SIZE;
4261 if (ext4_has_feature_extra_isize(sb)) {
4262 if (sbi->s_want_extra_isize <
4263 le16_to_cpu(es->s_want_extra_isize))
4264 sbi->s_want_extra_isize =
4265 le16_to_cpu(es->s_want_extra_isize);
4266 if (sbi->s_want_extra_isize <
4267 le16_to_cpu(es->s_min_extra_isize))
4268 sbi->s_want_extra_isize =
4269 le16_to_cpu(es->s_min_extra_isize);
4272 /* Check if enough inode space is available */
4273 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4274 sbi->s_inode_size) {
4275 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4276 EXT4_GOOD_OLD_INODE_SIZE;
4277 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4281 ext4_set_resv_clusters(sb);
4283 err = ext4_setup_system_zone(sb);
4285 ext4_msg(sb, KERN_ERR, "failed to initialize system "
4287 goto failed_mount4a;
4291 err = ext4_mb_init(sb);
4293 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4298 block = ext4_count_free_clusters(sb);
4299 ext4_free_blocks_count_set(sbi->s_es,
4300 EXT4_C2B(sbi, block));
4301 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4304 unsigned long freei = ext4_count_free_inodes(sb);
4305 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4306 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4310 err = percpu_counter_init(&sbi->s_dirs_counter,
4311 ext4_count_dirs(sb), GFP_KERNEL);
4313 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4316 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4319 ext4_msg(sb, KERN_ERR, "insufficient memory");
4323 if (ext4_has_feature_flex_bg(sb))
4324 if (!ext4_fill_flex_info(sb)) {
4325 ext4_msg(sb, KERN_ERR,
4326 "unable to initialize "
4327 "flex_bg meta info!");
4331 err = ext4_register_li_request(sb, first_not_zeroed);
4335 err = ext4_register_sysfs(sb);
4340 /* Enable quota usage during mount. */
4341 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
4342 err = ext4_enable_quotas(sb);
4346 #endif /* CONFIG_QUOTA */
4348 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4349 ext4_orphan_cleanup(sb, es);
4350 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4351 if (needs_recovery) {
4352 ext4_msg(sb, KERN_INFO, "recovery complete");
4353 ext4_mark_recovery_complete(sb, es);
4355 if (EXT4_SB(sb)->s_journal) {
4356 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4357 descr = " journalled data mode";
4358 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4359 descr = " ordered data mode";
4361 descr = " writeback data mode";
4363 descr = "out journal";
4365 if (test_opt(sb, DISCARD)) {
4366 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4367 if (!blk_queue_discard(q))
4368 ext4_msg(sb, KERN_WARNING,
4369 "mounting with \"discard\" option, but "
4370 "the device does not support discard");
4373 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4374 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4375 "Opts: %.*s%s%s", descr,
4376 (int) sizeof(sbi->s_es->s_mount_opts),
4377 sbi->s_es->s_mount_opts,
4378 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4380 if (es->s_error_count)
4381 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4383 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4384 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4385 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4386 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4393 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4398 ext4_unregister_sysfs(sb);
4401 ext4_unregister_li_request(sb);
4403 ext4_mb_release(sb);
4404 if (sbi->s_flex_groups)
4405 kvfree(sbi->s_flex_groups);
4406 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4407 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4408 percpu_counter_destroy(&sbi->s_dirs_counter);
4409 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4411 ext4_ext_release(sb);
4412 ext4_release_system_zone(sb);
4417 ext4_msg(sb, KERN_ERR, "mount failed");
4418 if (EXT4_SB(sb)->rsv_conversion_wq)
4419 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4421 if (sbi->s_ea_inode_cache) {
4422 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4423 sbi->s_ea_inode_cache = NULL;
4425 if (sbi->s_ea_block_cache) {
4426 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4427 sbi->s_ea_block_cache = NULL;
4429 if (sbi->s_journal) {
4430 jbd2_journal_destroy(sbi->s_journal);
4431 sbi->s_journal = NULL;
4434 ext4_es_unregister_shrinker(sbi);
4436 del_timer_sync(&sbi->s_err_report);
4438 kthread_stop(sbi->s_mmp_tsk);
4440 for (i = 0; i < db_count; i++)
4441 brelse(sbi->s_group_desc[i]);
4442 kvfree(sbi->s_group_desc);
4444 if (sbi->s_chksum_driver)
4445 crypto_free_shash(sbi->s_chksum_driver);
4447 for (i = 0; i < EXT4_MAXQUOTAS; i++)
4448 kfree(sbi->s_qf_names[i]);
4450 ext4_blkdev_remove(sbi);
4453 sb->s_fs_info = NULL;
4454 kfree(sbi->s_blockgroup_lock);
4458 fs_put_dax(dax_dev);
4459 return err ? err : ret;
4463 * Setup any per-fs journal parameters now. We'll do this both on
4464 * initial mount, once the journal has been initialised but before we've
4465 * done any recovery; and again on any subsequent remount.
4467 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4469 struct ext4_sb_info *sbi = EXT4_SB(sb);
4471 journal->j_commit_interval = sbi->s_commit_interval;
4472 journal->j_min_batch_time = sbi->s_min_batch_time;
4473 journal->j_max_batch_time = sbi->s_max_batch_time;
4475 write_lock(&journal->j_state_lock);
4476 if (test_opt(sb, BARRIER))
4477 journal->j_flags |= JBD2_BARRIER;
4479 journal->j_flags &= ~JBD2_BARRIER;
4480 if (test_opt(sb, DATA_ERR_ABORT))
4481 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4483 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4484 write_unlock(&journal->j_state_lock);
4487 static struct inode *ext4_get_journal_inode(struct super_block *sb,
4488 unsigned int journal_inum)
4490 struct inode *journal_inode;
4493 * Test for the existence of a valid inode on disk. Bad things
4494 * happen if we iget() an unused inode, as the subsequent iput()
4495 * will try to delete it.
4497 journal_inode = ext4_iget(sb, journal_inum);
4498 if (IS_ERR(journal_inode)) {
4499 ext4_msg(sb, KERN_ERR, "no journal found");
4502 if (!journal_inode->i_nlink) {
4503 make_bad_inode(journal_inode);
4504 iput(journal_inode);
4505 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4509 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4510 journal_inode, journal_inode->i_size);
4511 if (!S_ISREG(journal_inode->i_mode)) {
4512 ext4_msg(sb, KERN_ERR, "invalid journal inode");
4513 iput(journal_inode);
4516 return journal_inode;
4519 static journal_t *ext4_get_journal(struct super_block *sb,
4520 unsigned int journal_inum)
4522 struct inode *journal_inode;
4525 BUG_ON(!ext4_has_feature_journal(sb));
4527 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4531 journal = jbd2_journal_init_inode(journal_inode);
4533 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4534 iput(journal_inode);
4537 journal->j_private = sb;
4538 ext4_init_journal_params(sb, journal);
4542 static journal_t *ext4_get_dev_journal(struct super_block *sb,
4545 struct buffer_head *bh;
4549 int hblock, blocksize;
4550 ext4_fsblk_t sb_block;
4551 unsigned long offset;
4552 struct ext4_super_block *es;
4553 struct block_device *bdev;
4555 BUG_ON(!ext4_has_feature_journal(sb));
4557 bdev = ext4_blkdev_get(j_dev, sb);
4561 blocksize = sb->s_blocksize;
4562 hblock = bdev_logical_block_size(bdev);
4563 if (blocksize < hblock) {
4564 ext4_msg(sb, KERN_ERR,
4565 "blocksize too small for journal device");
4569 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4570 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4571 set_blocksize(bdev, blocksize);
4572 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4573 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4574 "external journal");
4578 es = (struct ext4_super_block *) (bh->b_data + offset);
4579 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4580 !(le32_to_cpu(es->s_feature_incompat) &
4581 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4582 ext4_msg(sb, KERN_ERR, "external journal has "
4588 if ((le32_to_cpu(es->s_feature_ro_compat) &
4589 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4590 es->s_checksum != ext4_superblock_csum(sb, es)) {
4591 ext4_msg(sb, KERN_ERR, "external journal has "
4592 "corrupt superblock");
4597 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4598 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4603 len = ext4_blocks_count(es);
4604 start = sb_block + 1;
4605 brelse(bh); /* we're done with the superblock */
4607 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4608 start, len, blocksize);
4610 ext4_msg(sb, KERN_ERR, "failed to create device journal");
4613 journal->j_private = sb;
4614 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4615 wait_on_buffer(journal->j_sb_buffer);
4616 if (!buffer_uptodate(journal->j_sb_buffer)) {
4617 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4620 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4621 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4622 "user (unsupported) - %d",
4623 be32_to_cpu(journal->j_superblock->s_nr_users));
4626 EXT4_SB(sb)->journal_bdev = bdev;
4627 ext4_init_journal_params(sb, journal);
4631 jbd2_journal_destroy(journal);
4633 ext4_blkdev_put(bdev);
4637 static int ext4_load_journal(struct super_block *sb,
4638 struct ext4_super_block *es,
4639 unsigned long journal_devnum)
4642 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4645 int really_read_only;
4647 BUG_ON(!ext4_has_feature_journal(sb));
4649 if (journal_devnum &&
4650 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4651 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4652 "numbers have changed");
4653 journal_dev = new_decode_dev(journal_devnum);
4655 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4657 really_read_only = bdev_read_only(sb->s_bdev);
4660 * Are we loading a blank journal or performing recovery after a
4661 * crash? For recovery, we need to check in advance whether we
4662 * can get read-write access to the device.
4664 if (ext4_has_feature_journal_needs_recovery(sb)) {
4665 if (sb_rdonly(sb)) {
4666 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4667 "required on readonly filesystem");
4668 if (really_read_only) {
4669 ext4_msg(sb, KERN_ERR, "write access "
4670 "unavailable, cannot proceed");
4673 ext4_msg(sb, KERN_INFO, "write access will "
4674 "be enabled during recovery");
4678 if (journal_inum && journal_dev) {
4679 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4680 "and inode journals!");
4685 if (!(journal = ext4_get_journal(sb, journal_inum)))
4688 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4692 if (!(journal->j_flags & JBD2_BARRIER))
4693 ext4_msg(sb, KERN_INFO, "barriers disabled");
4695 if (!ext4_has_feature_journal_needs_recovery(sb))
4696 err = jbd2_journal_wipe(journal, !really_read_only);
4698 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4700 memcpy(save, ((char *) es) +
4701 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4702 err = jbd2_journal_load(journal);
4704 memcpy(((char *) es) + EXT4_S_ERR_START,
4705 save, EXT4_S_ERR_LEN);
4710 ext4_msg(sb, KERN_ERR, "error loading journal");
4711 jbd2_journal_destroy(journal);
4715 EXT4_SB(sb)->s_journal = journal;
4716 ext4_clear_journal_err(sb, es);
4718 if (!really_read_only && journal_devnum &&
4719 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4720 es->s_journal_dev = cpu_to_le32(journal_devnum);
4722 /* Make sure we flush the recovery flag to disk. */
4723 ext4_commit_super(sb, 1);
4729 static int ext4_commit_super(struct super_block *sb, int sync)
4731 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4732 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4735 if (!sbh || block_device_ejected(sb))
4738 * If the file system is mounted read-only, don't update the
4739 * superblock write time. This avoids updating the superblock
4740 * write time when we are mounting the root file system
4741 * read/only but we need to replay the journal; at that point,
4742 * for people who are east of GMT and who make their clock
4743 * tick in localtime for Windows bug-for-bug compatibility,
4744 * the clock is set in the future, and this will cause e2fsck
4745 * to complain and force a full file system check.
4747 if (!(sb->s_flags & MS_RDONLY))
4748 es->s_wtime = cpu_to_le32(get_seconds());
4749 if (sb->s_bdev->bd_part)
4750 es->s_kbytes_written =
4751 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4752 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4753 EXT4_SB(sb)->s_sectors_written_start) >> 1));
4755 es->s_kbytes_written =
4756 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4757 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4758 ext4_free_blocks_count_set(es,
4759 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4760 &EXT4_SB(sb)->s_freeclusters_counter)));
4761 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4762 es->s_free_inodes_count =
4763 cpu_to_le32(percpu_counter_sum_positive(
4764 &EXT4_SB(sb)->s_freeinodes_counter));
4765 BUFFER_TRACE(sbh, "marking dirty");
4766 ext4_superblock_csum_set(sb);
4769 if (buffer_write_io_error(sbh)) {
4771 * Oh, dear. A previous attempt to write the
4772 * superblock failed. This could happen because the
4773 * USB device was yanked out. Or it could happen to
4774 * be a transient write error and maybe the block will
4775 * be remapped. Nothing we can do but to retry the
4776 * write and hope for the best.
4778 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4779 "superblock detected");
4780 clear_buffer_write_io_error(sbh);
4781 set_buffer_uptodate(sbh);
4783 mark_buffer_dirty(sbh);
4786 error = __sync_dirty_buffer(sbh,
4787 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
4791 error = buffer_write_io_error(sbh);
4793 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4795 clear_buffer_write_io_error(sbh);
4796 set_buffer_uptodate(sbh);
4803 * Have we just finished recovery? If so, and if we are mounting (or
4804 * remounting) the filesystem readonly, then we will end up with a
4805 * consistent fs on disk. Record that fact.
4807 static void ext4_mark_recovery_complete(struct super_block *sb,
4808 struct ext4_super_block *es)
4810 journal_t *journal = EXT4_SB(sb)->s_journal;
4812 if (!ext4_has_feature_journal(sb)) {
4813 BUG_ON(journal != NULL);
4816 jbd2_journal_lock_updates(journal);
4817 if (jbd2_journal_flush(journal) < 0)
4820 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
4821 ext4_clear_feature_journal_needs_recovery(sb);
4822 ext4_commit_super(sb, 1);
4826 jbd2_journal_unlock_updates(journal);
4830 * If we are mounting (or read-write remounting) a filesystem whose journal
4831 * has recorded an error from a previous lifetime, move that error to the
4832 * main filesystem now.
4834 static void ext4_clear_journal_err(struct super_block *sb,
4835 struct ext4_super_block *es)
4841 BUG_ON(!ext4_has_feature_journal(sb));
4843 journal = EXT4_SB(sb)->s_journal;
4846 * Now check for any error status which may have been recorded in the
4847 * journal by a prior ext4_error() or ext4_abort()
4850 j_errno = jbd2_journal_errno(journal);
4854 errstr = ext4_decode_error(sb, j_errno, nbuf);
4855 ext4_warning(sb, "Filesystem error recorded "
4856 "from previous mount: %s", errstr);
4857 ext4_warning(sb, "Marking fs in need of filesystem check.");
4859 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4860 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4861 ext4_commit_super(sb, 1);
4863 jbd2_journal_clear_err(journal);
4864 jbd2_journal_update_sb_errno(journal);
4869 * Force the running and committing transactions to commit,
4870 * and wait on the commit.
4872 int ext4_force_commit(struct super_block *sb)
4879 journal = EXT4_SB(sb)->s_journal;
4880 return ext4_journal_force_commit(journal);
4883 static int ext4_sync_fs(struct super_block *sb, int wait)
4887 bool needs_barrier = false;
4888 struct ext4_sb_info *sbi = EXT4_SB(sb);
4890 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
4893 trace_ext4_sync_fs(sb, wait);
4894 flush_workqueue(sbi->rsv_conversion_wq);
4896 * Writeback quota in non-journalled quota case - journalled quota has
4899 dquot_writeback_dquots(sb, -1);
4901 * Data writeback is possible w/o journal transaction, so barrier must
4902 * being sent at the end of the function. But we can skip it if
4903 * transaction_commit will do it for us.
4905 if (sbi->s_journal) {
4906 target = jbd2_get_latest_transaction(sbi->s_journal);
4907 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4908 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4909 needs_barrier = true;
4911 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4913 ret = jbd2_log_wait_commit(sbi->s_journal,
4916 } else if (wait && test_opt(sb, BARRIER))
4917 needs_barrier = true;
4918 if (needs_barrier) {
4920 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4929 * LVM calls this function before a (read-only) snapshot is created. This
4930 * gives us a chance to flush the journal completely and mark the fs clean.
4932 * Note that only this function cannot bring a filesystem to be in a clean
4933 * state independently. It relies on upper layer to stop all data & metadata
4936 static int ext4_freeze(struct super_block *sb)
4944 journal = EXT4_SB(sb)->s_journal;
4947 /* Now we set up the journal barrier. */
4948 jbd2_journal_lock_updates(journal);
4951 * Don't clear the needs_recovery flag if we failed to
4952 * flush the journal.
4954 error = jbd2_journal_flush(journal);
4958 /* Journal blocked and flushed, clear needs_recovery flag. */
4959 ext4_clear_feature_journal_needs_recovery(sb);
4962 error = ext4_commit_super(sb, 1);
4965 /* we rely on upper layer to stop further updates */
4966 jbd2_journal_unlock_updates(journal);
4971 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4972 * flag here, even though the filesystem is not technically dirty yet.
4974 static int ext4_unfreeze(struct super_block *sb)
4976 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
4979 if (EXT4_SB(sb)->s_journal) {
4980 /* Reset the needs_recovery flag before the fs is unlocked. */
4981 ext4_set_feature_journal_needs_recovery(sb);
4984 ext4_commit_super(sb, 1);
4989 * Structure to save mount options for ext4_remount's benefit
4991 struct ext4_mount_options {
4992 unsigned long s_mount_opt;
4993 unsigned long s_mount_opt2;
4996 unsigned long s_commit_interval;
4997 u32 s_min_batch_time, s_max_batch_time;
5000 char *s_qf_names[EXT4_MAXQUOTAS];
5004 static int ext4_remount(struct super_block *sb, int *flags, char *data)
5006 struct ext4_super_block *es;
5007 struct ext4_sb_info *sbi = EXT4_SB(sb);
5008 unsigned long old_sb_flags;
5009 struct ext4_mount_options old_opts;
5010 int enable_quota = 0;
5012 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
5017 char *orig_data = kstrdup(data, GFP_KERNEL);
5019 /* Store the original options */
5020 old_sb_flags = sb->s_flags;
5021 old_opts.s_mount_opt = sbi->s_mount_opt;
5022 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
5023 old_opts.s_resuid = sbi->s_resuid;
5024 old_opts.s_resgid = sbi->s_resgid;
5025 old_opts.s_commit_interval = sbi->s_commit_interval;
5026 old_opts.s_min_batch_time = sbi->s_min_batch_time;
5027 old_opts.s_max_batch_time = sbi->s_max_batch_time;
5029 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
5030 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5031 if (sbi->s_qf_names[i]) {
5032 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
5034 if (!old_opts.s_qf_names[i]) {
5035 for (j = 0; j < i; j++)
5036 kfree(old_opts.s_qf_names[j]);
5041 old_opts.s_qf_names[i] = NULL;
5043 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5044 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
5046 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
5051 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
5052 test_opt(sb, JOURNAL_CHECKSUM)) {
5053 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
5054 "during remount not supported; ignoring");
5055 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
5058 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5059 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5060 ext4_msg(sb, KERN_ERR, "can't mount with "
5061 "both data=journal and delalloc");
5065 if (test_opt(sb, DIOREAD_NOLOCK)) {
5066 ext4_msg(sb, KERN_ERR, "can't mount with "
5067 "both data=journal and dioread_nolock");
5071 if (test_opt(sb, DAX)) {
5072 ext4_msg(sb, KERN_ERR, "can't mount with "
5073 "both data=journal and dax");
5077 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5078 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5079 ext4_msg(sb, KERN_ERR, "can't mount with "
5080 "journal_async_commit in data=ordered mode");
5086 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5087 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5092 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
5093 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
5094 "dax flag with busy inodes while remounting");
5095 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
5098 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
5099 ext4_abort(sb, "Abort forced by user");
5101 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
5102 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
5106 if (sbi->s_journal) {
5107 ext4_init_journal_params(sb, sbi->s_journal);
5108 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5111 if (*flags & MS_LAZYTIME)
5112 sb->s_flags |= MS_LAZYTIME;
5114 if ((bool)(*flags & MS_RDONLY) != sb_rdonly(sb)) {
5115 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
5120 if (*flags & MS_RDONLY) {
5121 err = sync_filesystem(sb);
5124 err = dquot_suspend(sb, -1);
5129 * First of all, the unconditional stuff we have to do
5130 * to disable replay of the journal when we next remount
5132 sb->s_flags |= MS_RDONLY;
5135 * OK, test if we are remounting a valid rw partition
5136 * readonly, and if so set the rdonly flag and then
5137 * mark the partition as valid again.
5139 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5140 (sbi->s_mount_state & EXT4_VALID_FS))
5141 es->s_state = cpu_to_le16(sbi->s_mount_state);
5144 ext4_mark_recovery_complete(sb, es);
5146 /* Make sure we can mount this feature set readwrite */
5147 if (ext4_has_feature_readonly(sb) ||
5148 !ext4_feature_set_ok(sb, 0)) {
5153 * Make sure the group descriptor checksums
5154 * are sane. If they aren't, refuse to remount r/w.
5156 for (g = 0; g < sbi->s_groups_count; g++) {
5157 struct ext4_group_desc *gdp =
5158 ext4_get_group_desc(sb, g, NULL);
5160 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
5161 ext4_msg(sb, KERN_ERR,
5162 "ext4_remount: Checksum for group %u failed (%u!=%u)",
5163 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
5164 le16_to_cpu(gdp->bg_checksum));
5171 * If we have an unprocessed orphan list hanging
5172 * around from a previously readonly bdev mount,
5173 * require a full umount/remount for now.
5175 if (es->s_last_orphan) {
5176 ext4_msg(sb, KERN_WARNING, "Couldn't "
5177 "remount RDWR because of unprocessed "
5178 "orphan inode list. Please "
5179 "umount/remount instead");
5185 * Mounting a RDONLY partition read-write, so reread
5186 * and store the current valid flag. (It may have
5187 * been changed by e2fsck since we originally mounted
5191 ext4_clear_journal_err(sb, es);
5192 sbi->s_mount_state = le16_to_cpu(es->s_state);
5193 if (!ext4_setup_super(sb, es, 0))
5194 sb->s_flags &= ~MS_RDONLY;
5195 if (ext4_has_feature_mmp(sb))
5196 if (ext4_multi_mount_protect(sb,
5197 le64_to_cpu(es->s_mmp_block))) {
5206 * Reinitialize lazy itable initialization thread based on
5209 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
5210 ext4_unregister_li_request(sb);
5212 ext4_group_t first_not_zeroed;
5213 first_not_zeroed = ext4_has_uninit_itable(sb);
5214 ext4_register_li_request(sb, first_not_zeroed);
5217 ext4_setup_system_zone(sb);
5218 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
5219 ext4_commit_super(sb, 1);
5222 /* Release old quota file names */
5223 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5224 kfree(old_opts.s_qf_names[i]);
5226 if (sb_any_quota_suspended(sb))
5227 dquot_resume(sb, -1);
5228 else if (ext4_has_feature_quota(sb)) {
5229 err = ext4_enable_quotas(sb);
5236 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
5237 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5242 sb->s_flags = old_sb_flags;
5243 sbi->s_mount_opt = old_opts.s_mount_opt;
5244 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
5245 sbi->s_resuid = old_opts.s_resuid;
5246 sbi->s_resgid = old_opts.s_resgid;
5247 sbi->s_commit_interval = old_opts.s_commit_interval;
5248 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5249 sbi->s_max_batch_time = old_opts.s_max_batch_time;
5251 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
5252 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
5253 kfree(sbi->s_qf_names[i]);
5254 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5262 static int ext4_statfs_project(struct super_block *sb,
5263 kprojid_t projid, struct kstatfs *buf)
5266 struct dquot *dquot;
5270 qid = make_kqid_projid(projid);
5271 dquot = dqget(sb, qid);
5273 return PTR_ERR(dquot);
5274 spin_lock(&dquot->dq_dqb_lock);
5276 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5277 dquot->dq_dqb.dqb_bsoftlimit :
5278 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5279 if (limit && buf->f_blocks > limit) {
5280 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
5281 buf->f_blocks = limit;
5282 buf->f_bfree = buf->f_bavail =
5283 (buf->f_blocks > curblock) ?
5284 (buf->f_blocks - curblock) : 0;
5287 limit = dquot->dq_dqb.dqb_isoftlimit ?
5288 dquot->dq_dqb.dqb_isoftlimit :
5289 dquot->dq_dqb.dqb_ihardlimit;
5290 if (limit && buf->f_files > limit) {
5291 buf->f_files = limit;
5293 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5294 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5297 spin_unlock(&dquot->dq_dqb_lock);
5303 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5305 struct super_block *sb = dentry->d_sb;
5306 struct ext4_sb_info *sbi = EXT4_SB(sb);
5307 struct ext4_super_block *es = sbi->s_es;
5308 ext4_fsblk_t overhead = 0, resv_blocks;
5311 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5313 if (!test_opt(sb, MINIX_DF))
5314 overhead = sbi->s_overhead;
5316 buf->f_type = EXT4_SUPER_MAGIC;
5317 buf->f_bsize = sb->s_blocksize;
5318 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5319 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5320 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5321 /* prevent underflow in case that few free space is available */
5322 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
5323 buf->f_bavail = buf->f_bfree -
5324 (ext4_r_blocks_count(es) + resv_blocks);
5325 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5327 buf->f_files = le32_to_cpu(es->s_inodes_count);
5328 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5329 buf->f_namelen = EXT4_NAME_LEN;
5330 fsid = le64_to_cpup((void *)es->s_uuid) ^
5331 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5332 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5333 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
5336 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5337 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5338 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5347 * Helper functions so that transaction is started before we acquire dqio_sem
5348 * to keep correct lock ordering of transaction > dqio_sem
5350 static inline struct inode *dquot_to_inode(struct dquot *dquot)
5352 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5355 static int ext4_write_dquot(struct dquot *dquot)
5359 struct inode *inode;
5361 inode = dquot_to_inode(dquot);
5362 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5363 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5365 return PTR_ERR(handle);
5366 ret = dquot_commit(dquot);
5367 err = ext4_journal_stop(handle);
5373 static int ext4_acquire_dquot(struct dquot *dquot)
5378 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5379 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5381 return PTR_ERR(handle);
5382 ret = dquot_acquire(dquot);
5383 err = ext4_journal_stop(handle);
5389 static int ext4_release_dquot(struct dquot *dquot)
5394 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5395 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
5396 if (IS_ERR(handle)) {
5397 /* Release dquot anyway to avoid endless cycle in dqput() */
5398 dquot_release(dquot);
5399 return PTR_ERR(handle);
5401 ret = dquot_release(dquot);
5402 err = ext4_journal_stop(handle);
5408 static int ext4_mark_dquot_dirty(struct dquot *dquot)
5410 struct super_block *sb = dquot->dq_sb;
5411 struct ext4_sb_info *sbi = EXT4_SB(sb);
5413 /* Are we journaling quotas? */
5414 if (ext4_has_feature_quota(sb) ||
5415 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5416 dquot_mark_dquot_dirty(dquot);
5417 return ext4_write_dquot(dquot);
5419 return dquot_mark_dquot_dirty(dquot);
5423 static int ext4_write_info(struct super_block *sb, int type)
5428 /* Data block + inode block */
5429 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
5431 return PTR_ERR(handle);
5432 ret = dquot_commit_info(sb, type);
5433 err = ext4_journal_stop(handle);
5440 * Turn on quotas during mount time - we need to find
5441 * the quota file and such...
5443 static int ext4_quota_on_mount(struct super_block *sb, int type)
5445 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5446 EXT4_SB(sb)->s_jquota_fmt, type);
5449 static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5451 struct ext4_inode_info *ei = EXT4_I(inode);
5453 /* The first argument of lockdep_set_subclass has to be
5454 * *exactly* the same as the argument to init_rwsem() --- in
5455 * this case, in init_once() --- or lockdep gets unhappy
5456 * because the name of the lock is set using the
5457 * stringification of the argument to init_rwsem().
5459 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5460 lockdep_set_subclass(&ei->i_data_sem, subclass);
5464 * Standard function to be called on quota_on
5466 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5467 const struct path *path)
5471 if (!test_opt(sb, QUOTA))
5474 /* Quotafile not on the same filesystem? */
5475 if (path->dentry->d_sb != sb)
5477 /* Journaling quota? */
5478 if (EXT4_SB(sb)->s_qf_names[type]) {
5479 /* Quotafile not in fs root? */
5480 if (path->dentry->d_parent != sb->s_root)
5481 ext4_msg(sb, KERN_WARNING,
5482 "Quota file not on filesystem root. "
5483 "Journaled quota will not work");
5484 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5487 * Clear the flag just in case mount options changed since
5490 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
5494 * When we journal data on quota file, we have to flush journal to see
5495 * all updates to the file when we bypass pagecache...
5497 if (EXT4_SB(sb)->s_journal &&
5498 ext4_should_journal_data(d_inode(path->dentry))) {
5500 * We don't need to lock updates but journal_flush() could
5501 * otherwise be livelocked...
5503 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5504 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5505 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5510 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5511 err = dquot_quota_on(sb, type, format_id, path);
5513 lockdep_set_quota_inode(path->dentry->d_inode,
5516 struct inode *inode = d_inode(path->dentry);
5520 * Set inode flags to prevent userspace from messing with quota
5521 * files. If this fails, we return success anyway since quotas
5522 * are already enabled and this is not a hard failure.
5525 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5528 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5529 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5530 S_NOATIME | S_IMMUTABLE);
5531 ext4_mark_inode_dirty(handle, inode);
5532 ext4_journal_stop(handle);
5534 inode_unlock(inode);
5539 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5543 struct inode *qf_inode;
5544 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5545 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5546 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5547 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5550 BUG_ON(!ext4_has_feature_quota(sb));
5552 if (!qf_inums[type])
5555 qf_inode = ext4_iget(sb, qf_inums[type]);
5556 if (IS_ERR(qf_inode)) {
5557 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5558 return PTR_ERR(qf_inode);
5561 /* Don't account quota for quota files to avoid recursion */
5562 qf_inode->i_flags |= S_NOQUOTA;
5563 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
5564 err = dquot_enable(qf_inode, type, format_id, flags);
5567 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
5572 /* Enable usage tracking for all quota types. */
5573 static int ext4_enable_quotas(struct super_block *sb)
5576 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5577 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5578 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5579 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5581 bool quota_mopt[EXT4_MAXQUOTAS] = {
5582 test_opt(sb, USRQUOTA),
5583 test_opt(sb, GRPQUOTA),
5584 test_opt(sb, PRJQUOTA),
5587 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
5588 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5589 if (qf_inums[type]) {
5590 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5591 DQUOT_USAGE_ENABLED |
5592 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
5594 for (type--; type >= 0; type--)
5595 dquot_quota_off(sb, type);
5598 "Failed to enable quota tracking "
5599 "(type=%d, err=%d). Please run "
5600 "e2fsck to fix.", type, err);
5608 static int ext4_quota_off(struct super_block *sb, int type)
5610 struct inode *inode = sb_dqopt(sb)->files[type];
5614 /* Force all delayed allocation blocks to be allocated.
5615 * Caller already holds s_umount sem */
5616 if (test_opt(sb, DELALLOC))
5617 sync_filesystem(sb);
5619 if (!inode || !igrab(inode))
5622 err = dquot_quota_off(sb, type);
5623 if (err || ext4_has_feature_quota(sb))
5628 * Update modification times of quota files when userspace can
5629 * start looking at them. If we fail, we return success anyway since
5630 * this is not a hard failure and quotas are already disabled.
5632 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5635 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5636 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
5637 inode->i_mtime = inode->i_ctime = current_time(inode);
5638 ext4_mark_inode_dirty(handle, inode);
5639 ext4_journal_stop(handle);
5641 inode_unlock(inode);
5643 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
5647 return dquot_quota_off(sb, type);
5650 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5651 * acquiring the locks... As quota files are never truncated and quota code
5652 * itself serializes the operations (and no one else should touch the files)
5653 * we don't have to be afraid of races */
5654 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5655 size_t len, loff_t off)
5657 struct inode *inode = sb_dqopt(sb)->files[type];
5658 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5659 int offset = off & (sb->s_blocksize - 1);
5662 struct buffer_head *bh;
5663 loff_t i_size = i_size_read(inode);
5667 if (off+len > i_size)
5670 while (toread > 0) {
5671 tocopy = sb->s_blocksize - offset < toread ?
5672 sb->s_blocksize - offset : toread;
5673 bh = ext4_bread(NULL, inode, blk, 0);
5676 if (!bh) /* A hole? */
5677 memset(data, 0, tocopy);
5679 memcpy(data, bh->b_data+offset, tocopy);
5689 /* Write to quotafile (we know the transaction is already started and has
5690 * enough credits) */
5691 static ssize_t ext4_quota_write(struct super_block *sb, int type,
5692 const char *data, size_t len, loff_t off)
5694 struct inode *inode = sb_dqopt(sb)->files[type];
5695 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5696 int err, offset = off & (sb->s_blocksize - 1);
5698 struct buffer_head *bh;
5699 handle_t *handle = journal_current_handle();
5701 if (EXT4_SB(sb)->s_journal && !handle) {
5702 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5703 " cancelled because transaction is not started",
5704 (unsigned long long)off, (unsigned long long)len);
5708 * Since we account only one data block in transaction credits,
5709 * then it is impossible to cross a block boundary.
5711 if (sb->s_blocksize - offset < len) {
5712 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5713 " cancelled because not block aligned",
5714 (unsigned long long)off, (unsigned long long)len);
5719 bh = ext4_bread(handle, inode, blk,
5720 EXT4_GET_BLOCKS_CREATE |
5721 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5722 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5723 ext4_should_retry_alloc(inode->i_sb, &retries));
5728 BUFFER_TRACE(bh, "get write access");
5729 err = ext4_journal_get_write_access(handle, bh);
5735 memcpy(bh->b_data+offset, data, len);
5736 flush_dcache_page(bh->b_page);
5738 err = ext4_handle_dirty_metadata(handle, NULL, bh);
5741 if (inode->i_size < off + len) {
5742 i_size_write(inode, off + len);
5743 EXT4_I(inode)->i_disksize = inode->i_size;
5744 ext4_mark_inode_dirty(handle, inode);
5749 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
5751 const struct quota_format_ops *ops;
5753 if (!sb_has_quota_loaded(sb, qid->type))
5755 ops = sb_dqopt(sb)->ops[qid->type];
5756 if (!ops || !ops->get_next_id)
5758 return dquot_get_next_id(sb, qid);
5762 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5763 const char *dev_name, void *data)
5765 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5768 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5769 static inline void register_as_ext2(void)
5771 int err = register_filesystem(&ext2_fs_type);
5774 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5777 static inline void unregister_as_ext2(void)
5779 unregister_filesystem(&ext2_fs_type);
5782 static inline int ext2_feature_set_ok(struct super_block *sb)
5784 if (ext4_has_unknown_ext2_incompat_features(sb))
5788 if (ext4_has_unknown_ext2_ro_compat_features(sb))
5793 static inline void register_as_ext2(void) { }
5794 static inline void unregister_as_ext2(void) { }
5795 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5798 static inline void register_as_ext3(void)
5800 int err = register_filesystem(&ext3_fs_type);
5803 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5806 static inline void unregister_as_ext3(void)
5808 unregister_filesystem(&ext3_fs_type);
5811 static inline int ext3_feature_set_ok(struct super_block *sb)
5813 if (ext4_has_unknown_ext3_incompat_features(sb))
5815 if (!ext4_has_feature_journal(sb))
5819 if (ext4_has_unknown_ext3_ro_compat_features(sb))
5824 static struct file_system_type ext4_fs_type = {
5825 .owner = THIS_MODULE,
5827 .mount = ext4_mount,
5828 .kill_sb = kill_block_super,
5829 .fs_flags = FS_REQUIRES_DEV,
5831 MODULE_ALIAS_FS("ext4");
5833 /* Shared across all ext4 file systems */
5834 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5836 static int __init ext4_init_fs(void)
5840 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
5841 ext4_li_info = NULL;
5842 mutex_init(&ext4_li_mtx);
5844 /* Build-time check for flags consistency */
5845 ext4_check_flag_values();
5847 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
5848 init_waitqueue_head(&ext4__ioend_wq[i]);
5850 err = ext4_init_es();
5854 err = ext4_init_pageio();
5858 err = ext4_init_system_zone();
5862 err = ext4_init_sysfs();
5866 err = ext4_init_mballoc();
5869 err = init_inodecache();
5874 err = register_filesystem(&ext4_fs_type);
5880 unregister_as_ext2();
5881 unregister_as_ext3();
5882 destroy_inodecache();
5884 ext4_exit_mballoc();
5888 ext4_exit_system_zone();
5897 static void __exit ext4_exit_fs(void)
5899 ext4_destroy_lazyinit_thread();
5900 unregister_as_ext2();
5901 unregister_as_ext3();
5902 unregister_filesystem(&ext4_fs_type);
5903 destroy_inodecache();
5904 ext4_exit_mballoc();
5906 ext4_exit_system_zone();
5911 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5912 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5913 MODULE_LICENSE("GPL");
5914 MODULE_SOFTDEP("pre: crc32c");
5915 module_init(ext4_init_fs)
5916 module_exit(ext4_exit_fs)