1 // SPDX-License-Identifier: GPL-2.0
3 * linux/fs/ext4/super.c
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
12 * linux/fs/minix/inode.c
14 * Copyright (C) 1991, 1992 Linus Torvalds
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller (davem@caip.rutgers.edu), 1995
20 #include <linux/module.h>
21 #include <linux/string.h>
23 #include <linux/time.h>
24 #include <linux/vmalloc.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/backing-dev.h>
29 #include <linux/parser.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38 #include <linux/ctype.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <linux/dax.h>
42 #include <linux/cleancache.h>
43 #include <linux/uaccess.h>
44 #include <linux/iversion.h>
45 #include <linux/unicode.h>
47 #include <linux/kthread.h>
48 #include <linux/freezer.h>
51 #include "ext4_extents.h" /* Needed for trace points definition */
52 #include "ext4_jbd2.h"
58 #define CREATE_TRACE_POINTS
59 #include <trace/events/ext4.h>
61 static struct ext4_lazy_init *ext4_li_info;
62 static struct mutex ext4_li_mtx;
63 static struct ratelimit_state ext4_mount_msg_ratelimit;
65 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
66 unsigned long journal_devnum);
67 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
68 static int ext4_commit_super(struct super_block *sb, int sync);
69 static void ext4_mark_recovery_complete(struct super_block *sb,
70 struct ext4_super_block *es);
71 static void ext4_clear_journal_err(struct super_block *sb,
72 struct ext4_super_block *es);
73 static int ext4_sync_fs(struct super_block *sb, int wait);
74 static int ext4_remount(struct super_block *sb, int *flags, char *data);
75 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
76 static int ext4_unfreeze(struct super_block *sb);
77 static int ext4_freeze(struct super_block *sb);
78 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
80 static inline int ext2_feature_set_ok(struct super_block *sb);
81 static inline int ext3_feature_set_ok(struct super_block *sb);
82 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
83 static void ext4_destroy_lazyinit_thread(void);
84 static void ext4_unregister_li_request(struct super_block *sb);
85 static void ext4_clear_request_list(void);
86 static struct inode *ext4_get_journal_inode(struct super_block *sb,
87 unsigned int journal_inum);
92 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
93 * i_mmap_rwsem (inode->i_mmap_rwsem)!
96 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
97 * page lock -> i_data_sem (rw)
99 * buffered write path:
100 * sb_start_write -> i_mutex -> mmap_sem
101 * sb_start_write -> i_mutex -> transaction start -> page lock ->
105 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock
106 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start ->
110 * sb_start_write -> i_mutex -> mmap_sem
111 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
114 * transaction start -> page lock(s) -> i_data_sem (rw)
117 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
118 static struct file_system_type ext2_fs_type = {
119 .owner = THIS_MODULE,
122 .kill_sb = kill_block_super,
123 .fs_flags = FS_REQUIRES_DEV,
125 MODULE_ALIAS_FS("ext2");
126 MODULE_ALIAS("ext2");
127 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
129 #define IS_EXT2_SB(sb) (0)
133 static struct file_system_type ext3_fs_type = {
134 .owner = THIS_MODULE,
137 .kill_sb = kill_block_super,
138 .fs_flags = FS_REQUIRES_DEV,
140 MODULE_ALIAS_FS("ext3");
141 MODULE_ALIAS("ext3");
142 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
145 * This works like sb_bread() except it uses ERR_PTR for error
146 * returns. Currently with sb_bread it's impossible to distinguish
147 * between ENOMEM and EIO situations (since both result in a NULL
151 ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags)
153 struct buffer_head *bh = sb_getblk(sb, block);
156 return ERR_PTR(-ENOMEM);
157 if (buffer_uptodate(bh))
159 ll_rw_block(REQ_OP_READ, REQ_META | op_flags, 1, &bh);
161 if (buffer_uptodate(bh))
164 return ERR_PTR(-EIO);
167 static int ext4_verify_csum_type(struct super_block *sb,
168 struct ext4_super_block *es)
170 if (!ext4_has_feature_metadata_csum(sb))
173 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
176 static __le32 ext4_superblock_csum(struct super_block *sb,
177 struct ext4_super_block *es)
179 struct ext4_sb_info *sbi = EXT4_SB(sb);
180 int offset = offsetof(struct ext4_super_block, s_checksum);
183 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
185 return cpu_to_le32(csum);
188 static int ext4_superblock_csum_verify(struct super_block *sb,
189 struct ext4_super_block *es)
191 if (!ext4_has_metadata_csum(sb))
194 return es->s_checksum == ext4_superblock_csum(sb, es);
197 void ext4_superblock_csum_set(struct super_block *sb)
199 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
201 if (!ext4_has_metadata_csum(sb))
204 es->s_checksum = ext4_superblock_csum(sb, es);
207 void *ext4_kvmalloc(size_t size, gfp_t flags)
211 ret = kmalloc(size, flags | __GFP_NOWARN);
213 ret = __vmalloc(size, flags, PAGE_KERNEL);
217 void *ext4_kvzalloc(size_t size, gfp_t flags)
221 ret = kzalloc(size, flags | __GFP_NOWARN);
223 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
227 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
228 struct ext4_group_desc *bg)
230 return le32_to_cpu(bg->bg_block_bitmap_lo) |
231 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
232 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
235 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
236 struct ext4_group_desc *bg)
238 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
239 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
240 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
243 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
244 struct ext4_group_desc *bg)
246 return le32_to_cpu(bg->bg_inode_table_lo) |
247 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
248 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
251 __u32 ext4_free_group_clusters(struct super_block *sb,
252 struct ext4_group_desc *bg)
254 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
255 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
256 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
259 __u32 ext4_free_inodes_count(struct super_block *sb,
260 struct ext4_group_desc *bg)
262 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
263 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
264 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
267 __u32 ext4_used_dirs_count(struct super_block *sb,
268 struct ext4_group_desc *bg)
270 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
271 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
272 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
275 __u32 ext4_itable_unused_count(struct super_block *sb,
276 struct ext4_group_desc *bg)
278 return le16_to_cpu(bg->bg_itable_unused_lo) |
279 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
280 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
283 void ext4_block_bitmap_set(struct super_block *sb,
284 struct ext4_group_desc *bg, ext4_fsblk_t blk)
286 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
287 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
288 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
291 void ext4_inode_bitmap_set(struct super_block *sb,
292 struct ext4_group_desc *bg, ext4_fsblk_t blk)
294 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
295 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
296 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
299 void ext4_inode_table_set(struct super_block *sb,
300 struct ext4_group_desc *bg, ext4_fsblk_t blk)
302 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
303 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
304 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
307 void ext4_free_group_clusters_set(struct super_block *sb,
308 struct ext4_group_desc *bg, __u32 count)
310 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
311 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
312 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
315 void ext4_free_inodes_set(struct super_block *sb,
316 struct ext4_group_desc *bg, __u32 count)
318 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
319 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
320 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
323 void ext4_used_dirs_set(struct super_block *sb,
324 struct ext4_group_desc *bg, __u32 count)
326 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
327 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
328 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
331 void ext4_itable_unused_set(struct super_block *sb,
332 struct ext4_group_desc *bg, __u32 count)
334 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
335 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
336 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
339 static void __ext4_update_tstamp(__le32 *lo, __u8 *hi)
341 time64_t now = ktime_get_real_seconds();
343 now = clamp_val(now, 0, (1ull << 40) - 1);
345 *lo = cpu_to_le32(lower_32_bits(now));
346 *hi = upper_32_bits(now);
349 static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
351 return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
353 #define ext4_update_tstamp(es, tstamp) \
354 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
355 #define ext4_get_tstamp(es, tstamp) \
356 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
358 static void __save_error_info(struct super_block *sb, const char *func,
361 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
363 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
364 if (bdev_read_only(sb->s_bdev))
366 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
367 ext4_update_tstamp(es, s_last_error_time);
368 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
369 es->s_last_error_line = cpu_to_le32(line);
370 if (!es->s_first_error_time) {
371 es->s_first_error_time = es->s_last_error_time;
372 es->s_first_error_time_hi = es->s_last_error_time_hi;
373 strncpy(es->s_first_error_func, func,
374 sizeof(es->s_first_error_func));
375 es->s_first_error_line = cpu_to_le32(line);
376 es->s_first_error_ino = es->s_last_error_ino;
377 es->s_first_error_block = es->s_last_error_block;
380 * Start the daily error reporting function if it hasn't been
383 if (!es->s_error_count)
384 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
385 le32_add_cpu(&es->s_error_count, 1);
388 static void save_error_info(struct super_block *sb, const char *func,
391 __save_error_info(sb, func, line);
392 ext4_commit_super(sb, 1);
396 * The del_gendisk() function uninitializes the disk-specific data
397 * structures, including the bdi structure, without telling anyone
398 * else. Once this happens, any attempt to call mark_buffer_dirty()
399 * (for example, by ext4_commit_super), will cause a kernel OOPS.
400 * This is a kludge to prevent these oops until we can put in a proper
401 * hook in del_gendisk() to inform the VFS and file system layers.
403 static int block_device_ejected(struct super_block *sb)
405 struct inode *bd_inode = sb->s_bdev->bd_inode;
406 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
408 return bdi->dev == NULL;
411 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
413 struct super_block *sb = journal->j_private;
414 struct ext4_sb_info *sbi = EXT4_SB(sb);
415 int error = is_journal_aborted(journal);
416 struct ext4_journal_cb_entry *jce;
418 BUG_ON(txn->t_state == T_FINISHED);
420 ext4_process_freed_data(sb, txn->t_tid);
422 spin_lock(&sbi->s_md_lock);
423 while (!list_empty(&txn->t_private_list)) {
424 jce = list_entry(txn->t_private_list.next,
425 struct ext4_journal_cb_entry, jce_list);
426 list_del_init(&jce->jce_list);
427 spin_unlock(&sbi->s_md_lock);
428 jce->jce_func(sb, jce, error);
429 spin_lock(&sbi->s_md_lock);
431 spin_unlock(&sbi->s_md_lock);
434 static bool system_going_down(void)
436 return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
437 || system_state == SYSTEM_RESTART;
440 /* Deal with the reporting of failure conditions on a filesystem such as
441 * inconsistencies detected or read IO failures.
443 * On ext2, we can store the error state of the filesystem in the
444 * superblock. That is not possible on ext4, because we may have other
445 * write ordering constraints on the superblock which prevent us from
446 * writing it out straight away; and given that the journal is about to
447 * be aborted, we can't rely on the current, or future, transactions to
448 * write out the superblock safely.
450 * We'll just use the jbd2_journal_abort() error code to record an error in
451 * the journal instead. On recovery, the journal will complain about
452 * that error until we've noted it down and cleared it.
455 static void ext4_handle_error(struct super_block *sb)
457 if (test_opt(sb, WARN_ON_ERROR))
463 if (!test_opt(sb, ERRORS_CONT)) {
464 journal_t *journal = EXT4_SB(sb)->s_journal;
466 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
468 jbd2_journal_abort(journal, -EIO);
471 * We force ERRORS_RO behavior when system is rebooting. Otherwise we
472 * could panic during 'reboot -f' as the underlying device got already
475 if (test_opt(sb, ERRORS_RO) || system_going_down()) {
476 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
478 * Make sure updated value of ->s_mount_flags will be visible
479 * before ->s_flags update
482 sb->s_flags |= SB_RDONLY;
483 } else if (test_opt(sb, ERRORS_PANIC)) {
484 if (EXT4_SB(sb)->s_journal &&
485 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
487 panic("EXT4-fs (device %s): panic forced after error\n",
492 #define ext4_error_ratelimit(sb) \
493 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
496 void __ext4_error(struct super_block *sb, const char *function,
497 unsigned int line, const char *fmt, ...)
499 struct va_format vaf;
502 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
505 trace_ext4_error(sb, function, line);
506 if (ext4_error_ratelimit(sb)) {
511 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
512 sb->s_id, function, line, current->comm, &vaf);
515 save_error_info(sb, function, line);
516 ext4_handle_error(sb);
519 void __ext4_error_inode(struct inode *inode, const char *function,
520 unsigned int line, ext4_fsblk_t block,
521 const char *fmt, ...)
524 struct va_format vaf;
525 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
527 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
530 trace_ext4_error(inode->i_sb, function, line);
531 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
532 es->s_last_error_block = cpu_to_le64(block);
533 if (ext4_error_ratelimit(inode->i_sb)) {
538 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
539 "inode #%lu: block %llu: comm %s: %pV\n",
540 inode->i_sb->s_id, function, line, inode->i_ino,
541 block, current->comm, &vaf);
543 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
544 "inode #%lu: comm %s: %pV\n",
545 inode->i_sb->s_id, function, line, inode->i_ino,
546 current->comm, &vaf);
549 save_error_info(inode->i_sb, function, line);
550 ext4_handle_error(inode->i_sb);
553 void __ext4_error_file(struct file *file, const char *function,
554 unsigned int line, ext4_fsblk_t block,
555 const char *fmt, ...)
558 struct va_format vaf;
559 struct ext4_super_block *es;
560 struct inode *inode = file_inode(file);
561 char pathname[80], *path;
563 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
566 trace_ext4_error(inode->i_sb, function, line);
567 es = EXT4_SB(inode->i_sb)->s_es;
568 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
569 if (ext4_error_ratelimit(inode->i_sb)) {
570 path = file_path(file, pathname, sizeof(pathname));
578 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
579 "block %llu: comm %s: path %s: %pV\n",
580 inode->i_sb->s_id, function, line, inode->i_ino,
581 block, current->comm, path, &vaf);
584 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
585 "comm %s: path %s: %pV\n",
586 inode->i_sb->s_id, function, line, inode->i_ino,
587 current->comm, path, &vaf);
590 save_error_info(inode->i_sb, function, line);
591 ext4_handle_error(inode->i_sb);
594 const char *ext4_decode_error(struct super_block *sb, int errno,
601 errstr = "Corrupt filesystem";
604 errstr = "Filesystem failed CRC";
607 errstr = "IO failure";
610 errstr = "Out of memory";
613 if (!sb || (EXT4_SB(sb)->s_journal &&
614 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
615 errstr = "Journal has aborted";
617 errstr = "Readonly filesystem";
620 /* If the caller passed in an extra buffer for unknown
621 * errors, textualise them now. Else we just return
624 /* Check for truncated error codes... */
625 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
634 /* __ext4_std_error decodes expected errors from journaling functions
635 * automatically and invokes the appropriate error response. */
637 void __ext4_std_error(struct super_block *sb, const char *function,
638 unsigned int line, int errno)
643 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
646 /* Special case: if the error is EROFS, and we're not already
647 * inside a transaction, then there's really no point in logging
649 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
652 if (ext4_error_ratelimit(sb)) {
653 errstr = ext4_decode_error(sb, errno, nbuf);
654 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
655 sb->s_id, function, line, errstr);
658 save_error_info(sb, function, line);
659 ext4_handle_error(sb);
663 * ext4_abort is a much stronger failure handler than ext4_error. The
664 * abort function may be used to deal with unrecoverable failures such
665 * as journal IO errors or ENOMEM at a critical moment in log management.
667 * We unconditionally force the filesystem into an ABORT|READONLY state,
668 * unless the error response on the fs has been set to panic in which
669 * case we take the easy way out and panic immediately.
672 void __ext4_abort(struct super_block *sb, const char *function,
673 unsigned int line, const char *fmt, ...)
675 struct va_format vaf;
678 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
681 save_error_info(sb, function, line);
685 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
686 sb->s_id, function, line, &vaf);
689 if (sb_rdonly(sb) == 0) {
690 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
691 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
693 * Make sure updated value of ->s_mount_flags will be visible
694 * before ->s_flags update
697 sb->s_flags |= SB_RDONLY;
698 if (EXT4_SB(sb)->s_journal)
699 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
700 save_error_info(sb, function, line);
702 if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
703 if (EXT4_SB(sb)->s_journal &&
704 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
706 panic("EXT4-fs panic from previous error\n");
710 void __ext4_msg(struct super_block *sb,
711 const char *prefix, const char *fmt, ...)
713 struct va_format vaf;
716 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
722 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
726 #define ext4_warning_ratelimit(sb) \
727 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
730 void __ext4_warning(struct super_block *sb, const char *function,
731 unsigned int line, const char *fmt, ...)
733 struct va_format vaf;
736 if (!ext4_warning_ratelimit(sb))
742 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
743 sb->s_id, function, line, &vaf);
747 void __ext4_warning_inode(const struct inode *inode, const char *function,
748 unsigned int line, const char *fmt, ...)
750 struct va_format vaf;
753 if (!ext4_warning_ratelimit(inode->i_sb))
759 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
760 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
761 function, line, inode->i_ino, current->comm, &vaf);
765 void __ext4_grp_locked_error(const char *function, unsigned int line,
766 struct super_block *sb, ext4_group_t grp,
767 unsigned long ino, ext4_fsblk_t block,
768 const char *fmt, ...)
772 struct va_format vaf;
774 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
776 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
779 trace_ext4_error(sb, function, line);
780 es->s_last_error_ino = cpu_to_le32(ino);
781 es->s_last_error_block = cpu_to_le64(block);
782 __save_error_info(sb, function, line);
784 if (ext4_error_ratelimit(sb)) {
788 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
789 sb->s_id, function, line, grp);
791 printk(KERN_CONT "inode %lu: ", ino);
793 printk(KERN_CONT "block %llu:",
794 (unsigned long long) block);
795 printk(KERN_CONT "%pV\n", &vaf);
799 if (test_opt(sb, WARN_ON_ERROR))
802 if (test_opt(sb, ERRORS_CONT)) {
803 ext4_commit_super(sb, 0);
807 ext4_unlock_group(sb, grp);
808 ext4_commit_super(sb, 1);
809 ext4_handle_error(sb);
811 * We only get here in the ERRORS_RO case; relocking the group
812 * may be dangerous, but nothing bad will happen since the
813 * filesystem will have already been marked read/only and the
814 * journal has been aborted. We return 1 as a hint to callers
815 * who might what to use the return value from
816 * ext4_grp_locked_error() to distinguish between the
817 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
818 * aggressively from the ext4 function in question, with a
819 * more appropriate error code.
821 ext4_lock_group(sb, grp);
825 void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
829 struct ext4_sb_info *sbi = EXT4_SB(sb);
830 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
831 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
834 if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
835 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
838 percpu_counter_sub(&sbi->s_freeclusters_counter,
842 if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
843 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
848 count = ext4_free_inodes_count(sb, gdp);
849 percpu_counter_sub(&sbi->s_freeinodes_counter,
855 void ext4_update_dynamic_rev(struct super_block *sb)
857 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
859 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
863 "updating to rev %d because of new feature flag, "
864 "running e2fsck is recommended",
867 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
868 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
869 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
870 /* leave es->s_feature_*compat flags alone */
871 /* es->s_uuid will be set by e2fsck if empty */
874 * The rest of the superblock fields should be zero, and if not it
875 * means they are likely already in use, so leave them alone. We
876 * can leave it up to e2fsck to clean up any inconsistencies there.
881 * Open the external journal device
883 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
885 struct block_device *bdev;
886 char b[BDEVNAME_SIZE];
888 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
894 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
895 __bdevname(dev, b), PTR_ERR(bdev));
900 * Release the journal device
902 static void ext4_blkdev_put(struct block_device *bdev)
904 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
907 static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
909 struct block_device *bdev;
910 bdev = sbi->journal_bdev;
912 ext4_blkdev_put(bdev);
913 sbi->journal_bdev = NULL;
917 static inline struct inode *orphan_list_entry(struct list_head *l)
919 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
922 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
926 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
927 le32_to_cpu(sbi->s_es->s_last_orphan));
929 printk(KERN_ERR "sb_info orphan list:\n");
930 list_for_each(l, &sbi->s_orphan) {
931 struct inode *inode = orphan_list_entry(l);
933 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
934 inode->i_sb->s_id, inode->i_ino, inode,
935 inode->i_mode, inode->i_nlink,
941 static int ext4_quota_off(struct super_block *sb, int type);
943 static inline void ext4_quota_off_umount(struct super_block *sb)
947 /* Use our quota_off function to clear inode flags etc. */
948 for (type = 0; type < EXT4_MAXQUOTAS; type++)
949 ext4_quota_off(sb, type);
953 * This is a helper function which is used in the mount/remount
954 * codepaths (which holds s_umount) to fetch the quota file name.
956 static inline char *get_qf_name(struct super_block *sb,
957 struct ext4_sb_info *sbi,
960 return rcu_dereference_protected(sbi->s_qf_names[type],
961 lockdep_is_held(&sb->s_umount));
964 static inline void ext4_quota_off_umount(struct super_block *sb)
969 static void ext4_put_super(struct super_block *sb)
971 struct ext4_sb_info *sbi = EXT4_SB(sb);
972 struct ext4_super_block *es = sbi->s_es;
976 ext4_unregister_li_request(sb);
977 ext4_quota_off_umount(sb);
979 destroy_workqueue(sbi->rsv_conversion_wq);
981 if (sbi->s_journal) {
982 aborted = is_journal_aborted(sbi->s_journal);
983 err = jbd2_journal_destroy(sbi->s_journal);
984 sbi->s_journal = NULL;
985 if ((err < 0) && !aborted)
986 ext4_abort(sb, "Couldn't clean up the journal");
989 ext4_unregister_sysfs(sb);
990 ext4_es_unregister_shrinker(sbi);
991 del_timer_sync(&sbi->s_err_report);
992 ext4_release_system_zone(sb);
994 ext4_ext_release(sb);
996 if (!sb_rdonly(sb) && !aborted) {
997 ext4_clear_feature_journal_needs_recovery(sb);
998 es->s_state = cpu_to_le16(sbi->s_mount_state);
1001 ext4_commit_super(sb, 1);
1003 for (i = 0; i < sbi->s_gdb_count; i++)
1004 brelse(sbi->s_group_desc[i]);
1005 kvfree(sbi->s_group_desc);
1006 kvfree(sbi->s_flex_groups);
1007 percpu_counter_destroy(&sbi->s_freeclusters_counter);
1008 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1009 percpu_counter_destroy(&sbi->s_dirs_counter);
1010 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1011 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
1013 for (i = 0; i < EXT4_MAXQUOTAS; i++)
1014 kfree(get_qf_name(sb, sbi, i));
1017 /* Debugging code just in case the in-memory inode orphan list
1018 * isn't empty. The on-disk one can be non-empty if we've
1019 * detected an error and taken the fs readonly, but the
1020 * in-memory list had better be clean by this point. */
1021 if (!list_empty(&sbi->s_orphan))
1022 dump_orphan_list(sb, sbi);
1023 J_ASSERT(list_empty(&sbi->s_orphan));
1025 sync_blockdev(sb->s_bdev);
1026 invalidate_bdev(sb->s_bdev);
1027 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
1029 * Invalidate the journal device's buffers. We don't want them
1030 * floating about in memory - the physical journal device may
1031 * hotswapped, and it breaks the `ro-after' testing code.
1033 sync_blockdev(sbi->journal_bdev);
1034 invalidate_bdev(sbi->journal_bdev);
1035 ext4_blkdev_remove(sbi);
1038 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1039 sbi->s_ea_inode_cache = NULL;
1041 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1042 sbi->s_ea_block_cache = NULL;
1045 kthread_stop(sbi->s_mmp_tsk);
1047 sb->s_fs_info = NULL;
1049 * Now that we are completely done shutting down the
1050 * superblock, we need to actually destroy the kobject.
1052 kobject_put(&sbi->s_kobj);
1053 wait_for_completion(&sbi->s_kobj_unregister);
1054 if (sbi->s_chksum_driver)
1055 crypto_free_shash(sbi->s_chksum_driver);
1056 kfree(sbi->s_blockgroup_lock);
1057 fs_put_dax(sbi->s_daxdev);
1058 #ifdef CONFIG_UNICODE
1059 utf8_unload(sbi->s_encoding);
1064 static struct kmem_cache *ext4_inode_cachep;
1067 * Called inside transaction, so use GFP_NOFS
1069 static struct inode *ext4_alloc_inode(struct super_block *sb)
1071 struct ext4_inode_info *ei;
1073 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
1077 inode_set_iversion(&ei->vfs_inode, 1);
1078 spin_lock_init(&ei->i_raw_lock);
1079 INIT_LIST_HEAD(&ei->i_prealloc_list);
1080 spin_lock_init(&ei->i_prealloc_lock);
1081 ext4_es_init_tree(&ei->i_es_tree);
1082 rwlock_init(&ei->i_es_lock);
1083 INIT_LIST_HEAD(&ei->i_es_list);
1084 ei->i_es_all_nr = 0;
1085 ei->i_es_shk_nr = 0;
1086 ei->i_es_shrink_lblk = 0;
1087 ei->i_reserved_data_blocks = 0;
1088 ei->i_da_metadata_calc_len = 0;
1089 ei->i_da_metadata_calc_last_lblock = 0;
1090 spin_lock_init(&(ei->i_block_reservation_lock));
1091 ext4_init_pending_tree(&ei->i_pending_tree);
1093 ei->i_reserved_quota = 0;
1094 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
1097 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
1098 spin_lock_init(&ei->i_completed_io_lock);
1100 ei->i_datasync_tid = 0;
1101 atomic_set(&ei->i_unwritten, 0);
1102 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
1103 return &ei->vfs_inode;
1106 static int ext4_drop_inode(struct inode *inode)
1108 int drop = generic_drop_inode(inode);
1111 drop = fscrypt_drop_inode(inode);
1113 trace_ext4_drop_inode(inode, drop);
1117 static void ext4_free_in_core_inode(struct inode *inode)
1119 fscrypt_free_inode(inode);
1120 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1123 static void ext4_destroy_inode(struct inode *inode)
1125 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
1126 ext4_msg(inode->i_sb, KERN_ERR,
1127 "Inode %lu (%p): orphan list check failed!",
1128 inode->i_ino, EXT4_I(inode));
1129 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1130 EXT4_I(inode), sizeof(struct ext4_inode_info),
1136 static void init_once(void *foo)
1138 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
1140 INIT_LIST_HEAD(&ei->i_orphan);
1141 init_rwsem(&ei->xattr_sem);
1142 init_rwsem(&ei->i_data_sem);
1143 init_rwsem(&ei->i_mmap_sem);
1144 inode_init_once(&ei->vfs_inode);
1147 static int __init init_inodecache(void)
1149 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1150 sizeof(struct ext4_inode_info), 0,
1151 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1153 offsetof(struct ext4_inode_info, i_data),
1154 sizeof_field(struct ext4_inode_info, i_data),
1156 if (ext4_inode_cachep == NULL)
1161 static void destroy_inodecache(void)
1164 * Make sure all delayed rcu free inodes are flushed before we
1168 kmem_cache_destroy(ext4_inode_cachep);
1171 void ext4_clear_inode(struct inode *inode)
1173 invalidate_inode_buffers(inode);
1175 ext4_discard_preallocations(inode);
1176 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1178 if (EXT4_I(inode)->jinode) {
1179 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1180 EXT4_I(inode)->jinode);
1181 jbd2_free_inode(EXT4_I(inode)->jinode);
1182 EXT4_I(inode)->jinode = NULL;
1184 fscrypt_put_encryption_info(inode);
1185 fsverity_cleanup_inode(inode);
1188 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1189 u64 ino, u32 generation)
1191 struct inode *inode;
1194 * Currently we don't know the generation for parent directory, so
1195 * a generation of 0 means "accept any"
1197 inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1199 return ERR_CAST(inode);
1200 if (generation && inode->i_generation != generation) {
1202 return ERR_PTR(-ESTALE);
1208 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1209 int fh_len, int fh_type)
1211 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1212 ext4_nfs_get_inode);
1215 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1216 int fh_len, int fh_type)
1218 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1219 ext4_nfs_get_inode);
1222 static int ext4_nfs_commit_metadata(struct inode *inode)
1224 struct writeback_control wbc = {
1225 .sync_mode = WB_SYNC_ALL
1228 trace_ext4_nfs_commit_metadata(inode);
1229 return ext4_write_inode(inode, &wbc);
1233 * Try to release metadata pages (indirect blocks, directories) which are
1234 * mapped via the block device. Since these pages could have journal heads
1235 * which would prevent try_to_free_buffers() from freeing them, we must use
1236 * jbd2 layer's try_to_free_buffers() function to release them.
1238 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1241 journal_t *journal = EXT4_SB(sb)->s_journal;
1243 WARN_ON(PageChecked(page));
1244 if (!page_has_buffers(page))
1247 return jbd2_journal_try_to_free_buffers(journal, page,
1248 wait & ~__GFP_DIRECT_RECLAIM);
1249 return try_to_free_buffers(page);
1252 #ifdef CONFIG_FS_ENCRYPTION
1253 static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1255 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1256 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1259 static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1262 handle_t *handle = fs_data;
1263 int res, res2, credits, retries = 0;
1266 * Encrypting the root directory is not allowed because e2fsck expects
1267 * lost+found to exist and be unencrypted, and encrypting the root
1268 * directory would imply encrypting the lost+found directory as well as
1269 * the filename "lost+found" itself.
1271 if (inode->i_ino == EXT4_ROOT_INO)
1274 if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1277 res = ext4_convert_inline_data(inode);
1282 * If a journal handle was specified, then the encryption context is
1283 * being set on a new inode via inheritance and is part of a larger
1284 * transaction to create the inode. Otherwise the encryption context is
1285 * being set on an existing inode in its own transaction. Only in the
1286 * latter case should the "retry on ENOSPC" logic be used.
1290 res = ext4_xattr_set_handle(handle, inode,
1291 EXT4_XATTR_INDEX_ENCRYPTION,
1292 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1295 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1296 ext4_clear_inode_state(inode,
1297 EXT4_STATE_MAY_INLINE_DATA);
1299 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1300 * S_DAX may be disabled
1302 ext4_set_inode_flags(inode);
1307 res = dquot_initialize(inode);
1311 res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1316 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
1318 return PTR_ERR(handle);
1320 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1321 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1324 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1326 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1327 * S_DAX may be disabled
1329 ext4_set_inode_flags(inode);
1330 res = ext4_mark_inode_dirty(handle, inode);
1332 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1334 res2 = ext4_journal_stop(handle);
1336 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1343 static bool ext4_dummy_context(struct inode *inode)
1345 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1348 static bool ext4_has_stable_inodes(struct super_block *sb)
1350 return ext4_has_feature_stable_inodes(sb);
1353 static void ext4_get_ino_and_lblk_bits(struct super_block *sb,
1354 int *ino_bits_ret, int *lblk_bits_ret)
1356 *ino_bits_ret = 8 * sizeof(EXT4_SB(sb)->s_es->s_inodes_count);
1357 *lblk_bits_ret = 8 * sizeof(ext4_lblk_t);
1360 static const struct fscrypt_operations ext4_cryptops = {
1361 .key_prefix = "ext4:",
1362 .get_context = ext4_get_context,
1363 .set_context = ext4_set_context,
1364 .dummy_context = ext4_dummy_context,
1365 .empty_dir = ext4_empty_dir,
1366 .max_namelen = EXT4_NAME_LEN,
1367 .has_stable_inodes = ext4_has_stable_inodes,
1368 .get_ino_and_lblk_bits = ext4_get_ino_and_lblk_bits,
1373 static const char * const quotatypes[] = INITQFNAMES;
1374 #define QTYPE2NAME(t) (quotatypes[t])
1376 static int ext4_write_dquot(struct dquot *dquot);
1377 static int ext4_acquire_dquot(struct dquot *dquot);
1378 static int ext4_release_dquot(struct dquot *dquot);
1379 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1380 static int ext4_write_info(struct super_block *sb, int type);
1381 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1382 const struct path *path);
1383 static int ext4_quota_on_mount(struct super_block *sb, int type);
1384 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1385 size_t len, loff_t off);
1386 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1387 const char *data, size_t len, loff_t off);
1388 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1389 unsigned int flags);
1390 static int ext4_enable_quotas(struct super_block *sb);
1392 static struct dquot **ext4_get_dquots(struct inode *inode)
1394 return EXT4_I(inode)->i_dquot;
1397 static const struct dquot_operations ext4_quota_operations = {
1398 .get_reserved_space = ext4_get_reserved_space,
1399 .write_dquot = ext4_write_dquot,
1400 .acquire_dquot = ext4_acquire_dquot,
1401 .release_dquot = ext4_release_dquot,
1402 .mark_dirty = ext4_mark_dquot_dirty,
1403 .write_info = ext4_write_info,
1404 .alloc_dquot = dquot_alloc,
1405 .destroy_dquot = dquot_destroy,
1406 .get_projid = ext4_get_projid,
1407 .get_inode_usage = ext4_get_inode_usage,
1408 .get_next_id = dquot_get_next_id,
1411 static const struct quotactl_ops ext4_qctl_operations = {
1412 .quota_on = ext4_quota_on,
1413 .quota_off = ext4_quota_off,
1414 .quota_sync = dquot_quota_sync,
1415 .get_state = dquot_get_state,
1416 .set_info = dquot_set_dqinfo,
1417 .get_dqblk = dquot_get_dqblk,
1418 .set_dqblk = dquot_set_dqblk,
1419 .get_nextdqblk = dquot_get_next_dqblk,
1423 static const struct super_operations ext4_sops = {
1424 .alloc_inode = ext4_alloc_inode,
1425 .free_inode = ext4_free_in_core_inode,
1426 .destroy_inode = ext4_destroy_inode,
1427 .write_inode = ext4_write_inode,
1428 .dirty_inode = ext4_dirty_inode,
1429 .drop_inode = ext4_drop_inode,
1430 .evict_inode = ext4_evict_inode,
1431 .put_super = ext4_put_super,
1432 .sync_fs = ext4_sync_fs,
1433 .freeze_fs = ext4_freeze,
1434 .unfreeze_fs = ext4_unfreeze,
1435 .statfs = ext4_statfs,
1436 .remount_fs = ext4_remount,
1437 .show_options = ext4_show_options,
1439 .quota_read = ext4_quota_read,
1440 .quota_write = ext4_quota_write,
1441 .get_dquots = ext4_get_dquots,
1443 .bdev_try_to_free_page = bdev_try_to_free_page,
1446 static const struct export_operations ext4_export_ops = {
1447 .fh_to_dentry = ext4_fh_to_dentry,
1448 .fh_to_parent = ext4_fh_to_parent,
1449 .get_parent = ext4_get_parent,
1450 .commit_metadata = ext4_nfs_commit_metadata,
1454 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1455 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1456 Opt_nouid32, Opt_debug, Opt_removed,
1457 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1458 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1459 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1460 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1461 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1462 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1463 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1464 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1465 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1466 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1467 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1468 Opt_nowarn_on_error, Opt_mblk_io_submit,
1469 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1470 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1471 Opt_inode_readahead_blks, Opt_journal_ioprio,
1472 Opt_dioread_nolock, Opt_dioread_lock,
1473 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1474 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
1477 static const match_table_t tokens = {
1478 {Opt_bsd_df, "bsddf"},
1479 {Opt_minix_df, "minixdf"},
1480 {Opt_grpid, "grpid"},
1481 {Opt_grpid, "bsdgroups"},
1482 {Opt_nogrpid, "nogrpid"},
1483 {Opt_nogrpid, "sysvgroups"},
1484 {Opt_resgid, "resgid=%u"},
1485 {Opt_resuid, "resuid=%u"},
1487 {Opt_err_cont, "errors=continue"},
1488 {Opt_err_panic, "errors=panic"},
1489 {Opt_err_ro, "errors=remount-ro"},
1490 {Opt_nouid32, "nouid32"},
1491 {Opt_debug, "debug"},
1492 {Opt_removed, "oldalloc"},
1493 {Opt_removed, "orlov"},
1494 {Opt_user_xattr, "user_xattr"},
1495 {Opt_nouser_xattr, "nouser_xattr"},
1497 {Opt_noacl, "noacl"},
1498 {Opt_noload, "norecovery"},
1499 {Opt_noload, "noload"},
1500 {Opt_removed, "nobh"},
1501 {Opt_removed, "bh"},
1502 {Opt_commit, "commit=%u"},
1503 {Opt_min_batch_time, "min_batch_time=%u"},
1504 {Opt_max_batch_time, "max_batch_time=%u"},
1505 {Opt_journal_dev, "journal_dev=%u"},
1506 {Opt_journal_path, "journal_path=%s"},
1507 {Opt_journal_checksum, "journal_checksum"},
1508 {Opt_nojournal_checksum, "nojournal_checksum"},
1509 {Opt_journal_async_commit, "journal_async_commit"},
1510 {Opt_abort, "abort"},
1511 {Opt_data_journal, "data=journal"},
1512 {Opt_data_ordered, "data=ordered"},
1513 {Opt_data_writeback, "data=writeback"},
1514 {Opt_data_err_abort, "data_err=abort"},
1515 {Opt_data_err_ignore, "data_err=ignore"},
1516 {Opt_offusrjquota, "usrjquota="},
1517 {Opt_usrjquota, "usrjquota=%s"},
1518 {Opt_offgrpjquota, "grpjquota="},
1519 {Opt_grpjquota, "grpjquota=%s"},
1520 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1521 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1522 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1523 {Opt_grpquota, "grpquota"},
1524 {Opt_noquota, "noquota"},
1525 {Opt_quota, "quota"},
1526 {Opt_usrquota, "usrquota"},
1527 {Opt_prjquota, "prjquota"},
1528 {Opt_barrier, "barrier=%u"},
1529 {Opt_barrier, "barrier"},
1530 {Opt_nobarrier, "nobarrier"},
1531 {Opt_i_version, "i_version"},
1533 {Opt_stripe, "stripe=%u"},
1534 {Opt_delalloc, "delalloc"},
1535 {Opt_warn_on_error, "warn_on_error"},
1536 {Opt_nowarn_on_error, "nowarn_on_error"},
1537 {Opt_lazytime, "lazytime"},
1538 {Opt_nolazytime, "nolazytime"},
1539 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
1540 {Opt_nodelalloc, "nodelalloc"},
1541 {Opt_removed, "mblk_io_submit"},
1542 {Opt_removed, "nomblk_io_submit"},
1543 {Opt_block_validity, "block_validity"},
1544 {Opt_noblock_validity, "noblock_validity"},
1545 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1546 {Opt_journal_ioprio, "journal_ioprio=%u"},
1547 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1548 {Opt_auto_da_alloc, "auto_da_alloc"},
1549 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1550 {Opt_dioread_nolock, "dioread_nolock"},
1551 {Opt_dioread_lock, "dioread_lock"},
1552 {Opt_discard, "discard"},
1553 {Opt_nodiscard, "nodiscard"},
1554 {Opt_init_itable, "init_itable=%u"},
1555 {Opt_init_itable, "init_itable"},
1556 {Opt_noinit_itable, "noinit_itable"},
1557 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1558 {Opt_test_dummy_encryption, "test_dummy_encryption"},
1559 {Opt_nombcache, "nombcache"},
1560 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
1561 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1562 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1563 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1564 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1565 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
1569 static ext4_fsblk_t get_sb_block(void **data)
1571 ext4_fsblk_t sb_block;
1572 char *options = (char *) *data;
1574 if (!options || strncmp(options, "sb=", 3) != 0)
1575 return 1; /* Default location */
1578 /* TODO: use simple_strtoll with >32bit ext4 */
1579 sb_block = simple_strtoul(options, &options, 0);
1580 if (*options && *options != ',') {
1581 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1585 if (*options == ',')
1587 *data = (void *) options;
1592 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1593 static const char deprecated_msg[] =
1594 "Mount option \"%s\" will be removed by %s\n"
1595 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1598 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1600 struct ext4_sb_info *sbi = EXT4_SB(sb);
1601 char *qname, *old_qname = get_qf_name(sb, sbi, qtype);
1604 if (sb_any_quota_loaded(sb) && !old_qname) {
1605 ext4_msg(sb, KERN_ERR,
1606 "Cannot change journaled "
1607 "quota options when quota turned on");
1610 if (ext4_has_feature_quota(sb)) {
1611 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1612 "ignored when QUOTA feature is enabled");
1615 qname = match_strdup(args);
1617 ext4_msg(sb, KERN_ERR,
1618 "Not enough memory for storing quotafile name");
1622 if (strcmp(old_qname, qname) == 0)
1625 ext4_msg(sb, KERN_ERR,
1626 "%s quota file already specified",
1630 if (strchr(qname, '/')) {
1631 ext4_msg(sb, KERN_ERR,
1632 "quotafile must be on filesystem root");
1635 rcu_assign_pointer(sbi->s_qf_names[qtype], qname);
1643 static int clear_qf_name(struct super_block *sb, int qtype)
1646 struct ext4_sb_info *sbi = EXT4_SB(sb);
1647 char *old_qname = get_qf_name(sb, sbi, qtype);
1649 if (sb_any_quota_loaded(sb) && old_qname) {
1650 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1651 " when quota turned on");
1654 rcu_assign_pointer(sbi->s_qf_names[qtype], NULL);
1661 #define MOPT_SET 0x0001
1662 #define MOPT_CLEAR 0x0002
1663 #define MOPT_NOSUPPORT 0x0004
1664 #define MOPT_EXPLICIT 0x0008
1665 #define MOPT_CLEAR_ERR 0x0010
1666 #define MOPT_GTE0 0x0020
1669 #define MOPT_QFMT 0x0040
1671 #define MOPT_Q MOPT_NOSUPPORT
1672 #define MOPT_QFMT MOPT_NOSUPPORT
1674 #define MOPT_DATAJ 0x0080
1675 #define MOPT_NO_EXT2 0x0100
1676 #define MOPT_NO_EXT3 0x0200
1677 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1678 #define MOPT_STRING 0x0400
1680 static const struct mount_opts {
1684 } ext4_mount_opts[] = {
1685 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1686 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1687 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1688 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1689 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1690 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1691 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1692 MOPT_EXT4_ONLY | MOPT_SET},
1693 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1694 MOPT_EXT4_ONLY | MOPT_CLEAR},
1695 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1696 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1697 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1698 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1699 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1700 MOPT_EXT4_ONLY | MOPT_CLEAR},
1701 {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1702 {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
1703 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1704 MOPT_EXT4_ONLY | MOPT_CLEAR},
1705 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1706 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1707 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1708 EXT4_MOUNT_JOURNAL_CHECKSUM),
1709 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1710 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1711 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1712 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1713 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1714 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1716 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1718 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1719 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1720 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1721 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1722 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1723 {Opt_commit, 0, MOPT_GTE0},
1724 {Opt_max_batch_time, 0, MOPT_GTE0},
1725 {Opt_min_batch_time, 0, MOPT_GTE0},
1726 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1727 {Opt_init_itable, 0, MOPT_GTE0},
1728 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1729 {Opt_stripe, 0, MOPT_GTE0},
1730 {Opt_resuid, 0, MOPT_GTE0},
1731 {Opt_resgid, 0, MOPT_GTE0},
1732 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1733 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1734 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1735 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1736 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1737 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1738 MOPT_NO_EXT2 | MOPT_DATAJ},
1739 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1740 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1741 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1742 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1743 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1745 {Opt_acl, 0, MOPT_NOSUPPORT},
1746 {Opt_noacl, 0, MOPT_NOSUPPORT},
1748 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1749 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1750 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
1751 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1752 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1754 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1756 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1758 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1759 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1760 MOPT_CLEAR | MOPT_Q},
1761 {Opt_usrjquota, 0, MOPT_Q},
1762 {Opt_grpjquota, 0, MOPT_Q},
1763 {Opt_offusrjquota, 0, MOPT_Q},
1764 {Opt_offgrpjquota, 0, MOPT_Q},
1765 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1766 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1767 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1768 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1769 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
1770 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
1774 #ifdef CONFIG_UNICODE
1775 static const struct ext4_sb_encodings {
1779 } ext4_sb_encoding_map[] = {
1780 {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"},
1783 static int ext4_sb_read_encoding(const struct ext4_super_block *es,
1784 const struct ext4_sb_encodings **encoding,
1787 __u16 magic = le16_to_cpu(es->s_encoding);
1790 for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
1791 if (magic == ext4_sb_encoding_map[i].magic)
1794 if (i >= ARRAY_SIZE(ext4_sb_encoding_map))
1797 *encoding = &ext4_sb_encoding_map[i];
1798 *flags = le16_to_cpu(es->s_encoding_flags);
1804 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1805 substring_t *args, unsigned long *journal_devnum,
1806 unsigned int *journal_ioprio, int is_remount)
1808 struct ext4_sb_info *sbi = EXT4_SB(sb);
1809 const struct mount_opts *m;
1815 if (token == Opt_usrjquota)
1816 return set_qf_name(sb, USRQUOTA, &args[0]);
1817 else if (token == Opt_grpjquota)
1818 return set_qf_name(sb, GRPQUOTA, &args[0]);
1819 else if (token == Opt_offusrjquota)
1820 return clear_qf_name(sb, USRQUOTA);
1821 else if (token == Opt_offgrpjquota)
1822 return clear_qf_name(sb, GRPQUOTA);
1826 case Opt_nouser_xattr:
1827 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1830 return 1; /* handled by get_sb_block() */
1832 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1835 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1838 sb->s_flags |= SB_I_VERSION;
1841 sb->s_flags |= SB_LAZYTIME;
1843 case Opt_nolazytime:
1844 sb->s_flags &= ~SB_LAZYTIME;
1848 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1849 if (token == m->token)
1852 if (m->token == Opt_err) {
1853 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1854 "or missing value", opt);
1858 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1859 ext4_msg(sb, KERN_ERR,
1860 "Mount option \"%s\" incompatible with ext2", opt);
1863 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1864 ext4_msg(sb, KERN_ERR,
1865 "Mount option \"%s\" incompatible with ext3", opt);
1869 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1871 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1873 if (m->flags & MOPT_EXPLICIT) {
1874 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1875 set_opt2(sb, EXPLICIT_DELALLOC);
1876 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1877 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
1881 if (m->flags & MOPT_CLEAR_ERR)
1882 clear_opt(sb, ERRORS_MASK);
1883 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1884 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1885 "options when quota turned on");
1889 if (m->flags & MOPT_NOSUPPORT) {
1890 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1891 } else if (token == Opt_commit) {
1893 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1894 else if (arg > INT_MAX / HZ) {
1895 ext4_msg(sb, KERN_ERR,
1896 "Invalid commit interval %d, "
1897 "must be smaller than %d",
1901 sbi->s_commit_interval = HZ * arg;
1902 } else if (token == Opt_debug_want_extra_isize) {
1903 sbi->s_want_extra_isize = arg;
1904 } else if (token == Opt_max_batch_time) {
1905 sbi->s_max_batch_time = arg;
1906 } else if (token == Opt_min_batch_time) {
1907 sbi->s_min_batch_time = arg;
1908 } else if (token == Opt_inode_readahead_blks) {
1909 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1910 ext4_msg(sb, KERN_ERR,
1911 "EXT4-fs: inode_readahead_blks must be "
1912 "0 or a power of 2 smaller than 2^31");
1915 sbi->s_inode_readahead_blks = arg;
1916 } else if (token == Opt_init_itable) {
1917 set_opt(sb, INIT_INODE_TABLE);
1919 arg = EXT4_DEF_LI_WAIT_MULT;
1920 sbi->s_li_wait_mult = arg;
1921 } else if (token == Opt_max_dir_size_kb) {
1922 sbi->s_max_dir_size_kb = arg;
1923 } else if (token == Opt_stripe) {
1924 sbi->s_stripe = arg;
1925 } else if (token == Opt_resuid) {
1926 uid = make_kuid(current_user_ns(), arg);
1927 if (!uid_valid(uid)) {
1928 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1931 sbi->s_resuid = uid;
1932 } else if (token == Opt_resgid) {
1933 gid = make_kgid(current_user_ns(), arg);
1934 if (!gid_valid(gid)) {
1935 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1938 sbi->s_resgid = gid;
1939 } else if (token == Opt_journal_dev) {
1941 ext4_msg(sb, KERN_ERR,
1942 "Cannot specify journal on remount");
1945 *journal_devnum = arg;
1946 } else if (token == Opt_journal_path) {
1948 struct inode *journal_inode;
1953 ext4_msg(sb, KERN_ERR,
1954 "Cannot specify journal on remount");
1957 journal_path = match_strdup(&args[0]);
1958 if (!journal_path) {
1959 ext4_msg(sb, KERN_ERR, "error: could not dup "
1960 "journal device string");
1964 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1966 ext4_msg(sb, KERN_ERR, "error: could not find "
1967 "journal device path: error %d", error);
1968 kfree(journal_path);
1972 journal_inode = d_inode(path.dentry);
1973 if (!S_ISBLK(journal_inode->i_mode)) {
1974 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1975 "is not a block device", journal_path);
1977 kfree(journal_path);
1981 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1983 kfree(journal_path);
1984 } else if (token == Opt_journal_ioprio) {
1986 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1991 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1992 } else if (token == Opt_test_dummy_encryption) {
1993 #ifdef CONFIG_FS_ENCRYPTION
1994 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1995 ext4_msg(sb, KERN_WARNING,
1996 "Test dummy encryption mode enabled");
1998 ext4_msg(sb, KERN_WARNING,
1999 "Test dummy encryption mount option ignored");
2001 } else if (m->flags & MOPT_DATAJ) {
2003 if (!sbi->s_journal)
2004 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
2005 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
2006 ext4_msg(sb, KERN_ERR,
2007 "Cannot change data mode on remount");
2011 clear_opt(sb, DATA_FLAGS);
2012 sbi->s_mount_opt |= m->mount_opt;
2015 } else if (m->flags & MOPT_QFMT) {
2016 if (sb_any_quota_loaded(sb) &&
2017 sbi->s_jquota_fmt != m->mount_opt) {
2018 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
2019 "quota options when quota turned on");
2022 if (ext4_has_feature_quota(sb)) {
2023 ext4_msg(sb, KERN_INFO,
2024 "Quota format mount options ignored "
2025 "when QUOTA feature is enabled");
2028 sbi->s_jquota_fmt = m->mount_opt;
2030 } else if (token == Opt_dax) {
2031 #ifdef CONFIG_FS_DAX
2032 ext4_msg(sb, KERN_WARNING,
2033 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
2034 sbi->s_mount_opt |= m->mount_opt;
2036 ext4_msg(sb, KERN_INFO, "dax option not supported");
2039 } else if (token == Opt_data_err_abort) {
2040 sbi->s_mount_opt |= m->mount_opt;
2041 } else if (token == Opt_data_err_ignore) {
2042 sbi->s_mount_opt &= ~m->mount_opt;
2046 if (m->flags & MOPT_CLEAR)
2048 else if (unlikely(!(m->flags & MOPT_SET))) {
2049 ext4_msg(sb, KERN_WARNING,
2050 "buggy handling of option %s", opt);
2055 sbi->s_mount_opt |= m->mount_opt;
2057 sbi->s_mount_opt &= ~m->mount_opt;
2062 static int parse_options(char *options, struct super_block *sb,
2063 unsigned long *journal_devnum,
2064 unsigned int *journal_ioprio,
2067 struct ext4_sb_info __maybe_unused *sbi = EXT4_SB(sb);
2068 char *p, __maybe_unused *usr_qf_name, __maybe_unused *grp_qf_name;
2069 substring_t args[MAX_OPT_ARGS];
2075 while ((p = strsep(&options, ",")) != NULL) {
2079 * Initialize args struct so we know whether arg was
2080 * found; some options take optional arguments.
2082 args[0].to = args[0].from = NULL;
2083 token = match_token(p, tokens, args);
2084 if (handle_mount_opt(sb, p, token, args, journal_devnum,
2085 journal_ioprio, is_remount) < 0)
2090 * We do the test below only for project quotas. 'usrquota' and
2091 * 'grpquota' mount options are allowed even without quota feature
2092 * to support legacy quotas in quota files.
2094 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
2095 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
2096 "Cannot enable project quota enforcement.");
2099 usr_qf_name = get_qf_name(sb, sbi, USRQUOTA);
2100 grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA);
2101 if (usr_qf_name || grp_qf_name) {
2102 if (test_opt(sb, USRQUOTA) && usr_qf_name)
2103 clear_opt(sb, USRQUOTA);
2105 if (test_opt(sb, GRPQUOTA) && grp_qf_name)
2106 clear_opt(sb, GRPQUOTA);
2108 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
2109 ext4_msg(sb, KERN_ERR, "old and new quota "
2114 if (!sbi->s_jquota_fmt) {
2115 ext4_msg(sb, KERN_ERR, "journaled quota format "
2124 static inline void ext4_show_quota_options(struct seq_file *seq,
2125 struct super_block *sb)
2127 #if defined(CONFIG_QUOTA)
2128 struct ext4_sb_info *sbi = EXT4_SB(sb);
2129 char *usr_qf_name, *grp_qf_name;
2131 if (sbi->s_jquota_fmt) {
2134 switch (sbi->s_jquota_fmt) {
2145 seq_printf(seq, ",jqfmt=%s", fmtname);
2149 usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2150 grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2152 seq_show_option(seq, "usrjquota", usr_qf_name);
2154 seq_show_option(seq, "grpjquota", grp_qf_name);
2159 static const char *token2str(int token)
2161 const struct match_token *t;
2163 for (t = tokens; t->token != Opt_err; t++)
2164 if (t->token == token && !strchr(t->pattern, '='))
2171 * - it's set to a non-default value OR
2172 * - if the per-sb default is different from the global default
2174 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2177 struct ext4_sb_info *sbi = EXT4_SB(sb);
2178 struct ext4_super_block *es = sbi->s_es;
2179 int def_errors, def_mount_opt = sbi->s_def_mount_opt;
2180 const struct mount_opts *m;
2181 char sep = nodefs ? '\n' : ',';
2183 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2184 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2186 if (sbi->s_sb_block != 1)
2187 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2189 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2190 int want_set = m->flags & MOPT_SET;
2191 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2192 (m->flags & MOPT_CLEAR_ERR))
2194 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
2195 continue; /* skip if same as the default */
2197 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2198 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2199 continue; /* select Opt_noFoo vs Opt_Foo */
2200 SEQ_OPTS_PRINT("%s", token2str(m->token));
2203 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
2204 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
2205 SEQ_OPTS_PRINT("resuid=%u",
2206 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2207 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
2208 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
2209 SEQ_OPTS_PRINT("resgid=%u",
2210 from_kgid_munged(&init_user_ns, sbi->s_resgid));
2211 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
2212 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2213 SEQ_OPTS_PUTS("errors=remount-ro");
2214 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
2215 SEQ_OPTS_PUTS("errors=continue");
2216 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
2217 SEQ_OPTS_PUTS("errors=panic");
2218 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
2219 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
2220 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
2221 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
2222 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
2223 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2224 if (sb->s_flags & SB_I_VERSION)
2225 SEQ_OPTS_PUTS("i_version");
2226 if (nodefs || sbi->s_stripe)
2227 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
2228 if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2229 (sbi->s_mount_opt ^ def_mount_opt)) {
2230 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2231 SEQ_OPTS_PUTS("data=journal");
2232 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2233 SEQ_OPTS_PUTS("data=ordered");
2234 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2235 SEQ_OPTS_PUTS("data=writeback");
2238 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
2239 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2240 sbi->s_inode_readahead_blks);
2242 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
2243 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
2244 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2245 if (nodefs || sbi->s_max_dir_size_kb)
2246 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2247 if (test_opt(sb, DATA_ERR_ABORT))
2248 SEQ_OPTS_PUTS("data_err=abort");
2249 if (DUMMY_ENCRYPTION_ENABLED(sbi))
2250 SEQ_OPTS_PUTS("test_dummy_encryption");
2252 ext4_show_quota_options(seq, sb);
2256 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2258 return _ext4_show_options(seq, root->d_sb, 0);
2261 int ext4_seq_options_show(struct seq_file *seq, void *offset)
2263 struct super_block *sb = seq->private;
2266 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
2267 rc = _ext4_show_options(seq, sb, 1);
2268 seq_puts(seq, "\n");
2272 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
2275 struct ext4_sb_info *sbi = EXT4_SB(sb);
2278 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2279 ext4_msg(sb, KERN_ERR, "revision level too high, "
2280 "forcing read-only mode");
2285 if (!(sbi->s_mount_state & EXT4_VALID_FS))
2286 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2287 "running e2fsck is recommended");
2288 else if (sbi->s_mount_state & EXT4_ERROR_FS)
2289 ext4_msg(sb, KERN_WARNING,
2290 "warning: mounting fs with errors, "
2291 "running e2fsck is recommended");
2292 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
2293 le16_to_cpu(es->s_mnt_count) >=
2294 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2295 ext4_msg(sb, KERN_WARNING,
2296 "warning: maximal mount count reached, "
2297 "running e2fsck is recommended");
2298 else if (le32_to_cpu(es->s_checkinterval) &&
2299 (ext4_get_tstamp(es, s_lastcheck) +
2300 le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
2301 ext4_msg(sb, KERN_WARNING,
2302 "warning: checktime reached, "
2303 "running e2fsck is recommended");
2304 if (!sbi->s_journal)
2305 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
2306 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
2307 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
2308 le16_add_cpu(&es->s_mnt_count, 1);
2309 ext4_update_tstamp(es, s_mtime);
2311 ext4_set_feature_journal_needs_recovery(sb);
2313 err = ext4_commit_super(sb, 1);
2315 if (test_opt(sb, DEBUG))
2316 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
2317 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2319 sbi->s_groups_count,
2320 EXT4_BLOCKS_PER_GROUP(sb),
2321 EXT4_INODES_PER_GROUP(sb),
2322 sbi->s_mount_opt, sbi->s_mount_opt2);
2324 cleancache_init_fs(sb);
2328 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2330 struct ext4_sb_info *sbi = EXT4_SB(sb);
2331 struct flex_groups *new_groups;
2334 if (!sbi->s_log_groups_per_flex)
2337 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2338 if (size <= sbi->s_flex_groups_allocated)
2341 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
2342 new_groups = kvzalloc(size, GFP_KERNEL);
2344 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2345 size / (int) sizeof(struct flex_groups));
2349 if (sbi->s_flex_groups) {
2350 memcpy(new_groups, sbi->s_flex_groups,
2351 (sbi->s_flex_groups_allocated *
2352 sizeof(struct flex_groups)));
2353 kvfree(sbi->s_flex_groups);
2355 sbi->s_flex_groups = new_groups;
2356 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2360 static int ext4_fill_flex_info(struct super_block *sb)
2362 struct ext4_sb_info *sbi = EXT4_SB(sb);
2363 struct ext4_group_desc *gdp = NULL;
2364 ext4_group_t flex_group;
2367 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2368 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2369 sbi->s_log_groups_per_flex = 0;
2373 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2377 for (i = 0; i < sbi->s_groups_count; i++) {
2378 gdp = ext4_get_group_desc(sb, i, NULL);
2380 flex_group = ext4_flex_group(sbi, i);
2381 atomic_add(ext4_free_inodes_count(sb, gdp),
2382 &sbi->s_flex_groups[flex_group].free_inodes);
2383 atomic64_add(ext4_free_group_clusters(sb, gdp),
2384 &sbi->s_flex_groups[flex_group].free_clusters);
2385 atomic_add(ext4_used_dirs_count(sb, gdp),
2386 &sbi->s_flex_groups[flex_group].used_dirs);
2394 static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2395 struct ext4_group_desc *gdp)
2397 int offset = offsetof(struct ext4_group_desc, bg_checksum);
2399 __le32 le_group = cpu_to_le32(block_group);
2400 struct ext4_sb_info *sbi = EXT4_SB(sb);
2402 if (ext4_has_metadata_csum(sbi->s_sb)) {
2403 /* Use new metadata_csum algorithm */
2405 __u16 dummy_csum = 0;
2407 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2409 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2410 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2411 sizeof(dummy_csum));
2412 offset += sizeof(dummy_csum);
2413 if (offset < sbi->s_desc_size)
2414 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2415 sbi->s_desc_size - offset);
2417 crc = csum32 & 0xFFFF;
2421 /* old crc16 code */
2422 if (!ext4_has_feature_gdt_csum(sb))
2425 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2426 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2427 crc = crc16(crc, (__u8 *)gdp, offset);
2428 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2429 /* for checksum of struct ext4_group_desc do the rest...*/
2430 if (ext4_has_feature_64bit(sb) &&
2431 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2432 crc = crc16(crc, (__u8 *)gdp + offset,
2433 le16_to_cpu(sbi->s_es->s_desc_size) -
2437 return cpu_to_le16(crc);
2440 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2441 struct ext4_group_desc *gdp)
2443 if (ext4_has_group_desc_csum(sb) &&
2444 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
2450 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2451 struct ext4_group_desc *gdp)
2453 if (!ext4_has_group_desc_csum(sb))
2455 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2458 /* Called at mount-time, super-block is locked */
2459 static int ext4_check_descriptors(struct super_block *sb,
2460 ext4_fsblk_t sb_block,
2461 ext4_group_t *first_not_zeroed)
2463 struct ext4_sb_info *sbi = EXT4_SB(sb);
2464 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2465 ext4_fsblk_t last_block;
2466 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
2467 ext4_fsblk_t block_bitmap;
2468 ext4_fsblk_t inode_bitmap;
2469 ext4_fsblk_t inode_table;
2470 int flexbg_flag = 0;
2471 ext4_group_t i, grp = sbi->s_groups_count;
2473 if (ext4_has_feature_flex_bg(sb))
2476 ext4_debug("Checking group descriptors");
2478 for (i = 0; i < sbi->s_groups_count; i++) {
2479 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2481 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2482 last_block = ext4_blocks_count(sbi->s_es) - 1;
2484 last_block = first_block +
2485 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2487 if ((grp == sbi->s_groups_count) &&
2488 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2491 block_bitmap = ext4_block_bitmap(sb, gdp);
2492 if (block_bitmap == sb_block) {
2493 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2494 "Block bitmap for group %u overlaps "
2499 if (block_bitmap >= sb_block + 1 &&
2500 block_bitmap <= last_bg_block) {
2501 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2502 "Block bitmap for group %u overlaps "
2503 "block group descriptors", i);
2507 if (block_bitmap < first_block || block_bitmap > last_block) {
2508 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2509 "Block bitmap for group %u not in group "
2510 "(block %llu)!", i, block_bitmap);
2513 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2514 if (inode_bitmap == sb_block) {
2515 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2516 "Inode bitmap for group %u overlaps "
2521 if (inode_bitmap >= sb_block + 1 &&
2522 inode_bitmap <= last_bg_block) {
2523 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2524 "Inode bitmap for group %u overlaps "
2525 "block group descriptors", i);
2529 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2530 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2531 "Inode bitmap for group %u not in group "
2532 "(block %llu)!", i, inode_bitmap);
2535 inode_table = ext4_inode_table(sb, gdp);
2536 if (inode_table == sb_block) {
2537 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2538 "Inode table for group %u overlaps "
2543 if (inode_table >= sb_block + 1 &&
2544 inode_table <= last_bg_block) {
2545 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2546 "Inode table for group %u overlaps "
2547 "block group descriptors", i);
2551 if (inode_table < first_block ||
2552 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2553 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2554 "Inode table for group %u not in group "
2555 "(block %llu)!", i, inode_table);
2558 ext4_lock_group(sb, i);
2559 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2560 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2561 "Checksum for group %u failed (%u!=%u)",
2562 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2563 gdp)), le16_to_cpu(gdp->bg_checksum));
2564 if (!sb_rdonly(sb)) {
2565 ext4_unlock_group(sb, i);
2569 ext4_unlock_group(sb, i);
2571 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2573 if (NULL != first_not_zeroed)
2574 *first_not_zeroed = grp;
2578 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2579 * the superblock) which were deleted from all directories, but held open by
2580 * a process at the time of a crash. We walk the list and try to delete these
2581 * inodes at recovery time (only with a read-write filesystem).
2583 * In order to keep the orphan inode chain consistent during traversal (in
2584 * case of crash during recovery), we link each inode into the superblock
2585 * orphan list_head and handle it the same way as an inode deletion during
2586 * normal operation (which journals the operations for us).
2588 * We only do an iget() and an iput() on each inode, which is very safe if we
2589 * accidentally point at an in-use or already deleted inode. The worst that
2590 * can happen in this case is that we get a "bit already cleared" message from
2591 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2592 * e2fsck was run on this filesystem, and it must have already done the orphan
2593 * inode cleanup for us, so we can safely abort without any further action.
2595 static void ext4_orphan_cleanup(struct super_block *sb,
2596 struct ext4_super_block *es)
2598 unsigned int s_flags = sb->s_flags;
2599 int ret, nr_orphans = 0, nr_truncates = 0;
2601 int quota_update = 0;
2604 if (!es->s_last_orphan) {
2605 jbd_debug(4, "no orphan inodes to clean up\n");
2609 if (bdev_read_only(sb->s_bdev)) {
2610 ext4_msg(sb, KERN_ERR, "write access "
2611 "unavailable, skipping orphan cleanup");
2615 /* Check if feature set would not allow a r/w mount */
2616 if (!ext4_feature_set_ok(sb, 0)) {
2617 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2618 "unknown ROCOMPAT features");
2622 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2623 /* don't clear list on RO mount w/ errors */
2624 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
2625 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2626 "clearing orphan list.\n");
2627 es->s_last_orphan = 0;
2629 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2633 if (s_flags & SB_RDONLY) {
2634 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2635 sb->s_flags &= ~SB_RDONLY;
2638 /* Needed for iput() to work correctly and not trash data */
2639 sb->s_flags |= SB_ACTIVE;
2642 * Turn on quotas which were not enabled for read-only mounts if
2643 * filesystem has quota feature, so that they are updated correctly.
2645 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
2646 int ret = ext4_enable_quotas(sb);
2651 ext4_msg(sb, KERN_ERR,
2652 "Cannot turn on quotas: error %d", ret);
2655 /* Turn on journaled quotas used for old sytle */
2656 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2657 if (EXT4_SB(sb)->s_qf_names[i]) {
2658 int ret = ext4_quota_on_mount(sb, i);
2663 ext4_msg(sb, KERN_ERR,
2664 "Cannot turn on journaled "
2665 "quota: type %d: error %d", i, ret);
2670 while (es->s_last_orphan) {
2671 struct inode *inode;
2674 * We may have encountered an error during cleanup; if
2675 * so, skip the rest.
2677 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2678 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2679 es->s_last_orphan = 0;
2683 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2684 if (IS_ERR(inode)) {
2685 es->s_last_orphan = 0;
2689 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2690 dquot_initialize(inode);
2691 if (inode->i_nlink) {
2692 if (test_opt(sb, DEBUG))
2693 ext4_msg(sb, KERN_DEBUG,
2694 "%s: truncating inode %lu to %lld bytes",
2695 __func__, inode->i_ino, inode->i_size);
2696 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2697 inode->i_ino, inode->i_size);
2699 truncate_inode_pages(inode->i_mapping, inode->i_size);
2700 ret = ext4_truncate(inode);
2702 ext4_std_error(inode->i_sb, ret);
2703 inode_unlock(inode);
2706 if (test_opt(sb, DEBUG))
2707 ext4_msg(sb, KERN_DEBUG,
2708 "%s: deleting unreferenced inode %lu",
2709 __func__, inode->i_ino);
2710 jbd_debug(2, "deleting unreferenced inode %lu\n",
2714 iput(inode); /* The delete magic happens here! */
2717 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2720 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2721 PLURAL(nr_orphans));
2723 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2724 PLURAL(nr_truncates));
2726 /* Turn off quotas if they were enabled for orphan cleanup */
2728 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2729 if (sb_dqopt(sb)->files[i])
2730 dquot_quota_off(sb, i);
2734 sb->s_flags = s_flags; /* Restore SB_RDONLY status */
2738 * Maximal extent format file size.
2739 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2740 * extent format containers, within a sector_t, and within i_blocks
2741 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2742 * so that won't be a limiting factor.
2744 * However there is other limiting factor. We do store extents in the form
2745 * of starting block and length, hence the resulting length of the extent
2746 * covering maximum file size must fit into on-disk format containers as
2747 * well. Given that length is always by 1 unit bigger than max unit (because
2748 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2750 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2752 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2755 loff_t upper_limit = MAX_LFS_FILESIZE;
2757 BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
2759 if (!has_huge_files) {
2760 upper_limit = (1LL << 32) - 1;
2762 /* total blocks in file system block size */
2763 upper_limit >>= (blkbits - 9);
2764 upper_limit <<= blkbits;
2768 * 32-bit extent-start container, ee_block. We lower the maxbytes
2769 * by one fs block, so ee_len can cover the extent of maximum file
2772 res = (1LL << 32) - 1;
2775 /* Sanity check against vm- & vfs- imposed limits */
2776 if (res > upper_limit)
2783 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2784 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2785 * We need to be 1 filesystem block less than the 2^48 sector limit.
2787 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2789 loff_t res = EXT4_NDIR_BLOCKS;
2792 /* This is calculated to be the largest file size for a dense, block
2793 * mapped file such that the file's total number of 512-byte sectors,
2794 * including data and all indirect blocks, does not exceed (2^48 - 1).
2796 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2797 * number of 512-byte sectors of the file.
2800 if (!has_huge_files) {
2802 * !has_huge_files or implies that the inode i_block field
2803 * represents total file blocks in 2^32 512-byte sectors ==
2804 * size of vfs inode i_blocks * 8
2806 upper_limit = (1LL << 32) - 1;
2808 /* total blocks in file system block size */
2809 upper_limit >>= (bits - 9);
2813 * We use 48 bit ext4_inode i_blocks
2814 * With EXT4_HUGE_FILE_FL set the i_blocks
2815 * represent total number of blocks in
2816 * file system block size
2818 upper_limit = (1LL << 48) - 1;
2822 /* indirect blocks */
2824 /* double indirect blocks */
2825 meta_blocks += 1 + (1LL << (bits-2));
2826 /* tripple indirect blocks */
2827 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2829 upper_limit -= meta_blocks;
2830 upper_limit <<= bits;
2832 res += 1LL << (bits-2);
2833 res += 1LL << (2*(bits-2));
2834 res += 1LL << (3*(bits-2));
2836 if (res > upper_limit)
2839 if (res > MAX_LFS_FILESIZE)
2840 res = MAX_LFS_FILESIZE;
2845 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2846 ext4_fsblk_t logical_sb_block, int nr)
2848 struct ext4_sb_info *sbi = EXT4_SB(sb);
2849 ext4_group_t bg, first_meta_bg;
2852 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2854 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
2855 return logical_sb_block + nr + 1;
2856 bg = sbi->s_desc_per_block * nr;
2857 if (ext4_bg_has_super(sb, bg))
2861 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2862 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2863 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2866 if (sb->s_blocksize == 1024 && nr == 0 &&
2867 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
2870 return (has_super + ext4_group_first_block_no(sb, bg));
2874 * ext4_get_stripe_size: Get the stripe size.
2875 * @sbi: In memory super block info
2877 * If we have specified it via mount option, then
2878 * use the mount option value. If the value specified at mount time is
2879 * greater than the blocks per group use the super block value.
2880 * If the super block value is greater than blocks per group return 0.
2881 * Allocator needs it be less than blocks per group.
2884 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2886 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2887 unsigned long stripe_width =
2888 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2891 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2892 ret = sbi->s_stripe;
2893 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
2895 else if (stride && stride <= sbi->s_blocks_per_group)
2901 * If the stripe width is 1, this makes no sense and
2902 * we set it to 0 to turn off stripe handling code.
2911 * Check whether this filesystem can be mounted based on
2912 * the features present and the RDONLY/RDWR mount requested.
2913 * Returns 1 if this filesystem can be mounted as requested,
2914 * 0 if it cannot be.
2916 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2918 if (ext4_has_unknown_ext4_incompat_features(sb)) {
2919 ext4_msg(sb, KERN_ERR,
2920 "Couldn't mount because of "
2921 "unsupported optional features (%x)",
2922 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2923 ~EXT4_FEATURE_INCOMPAT_SUPP));
2927 #ifndef CONFIG_UNICODE
2928 if (ext4_has_feature_casefold(sb)) {
2929 ext4_msg(sb, KERN_ERR,
2930 "Filesystem with casefold feature cannot be "
2931 "mounted without CONFIG_UNICODE");
2939 if (ext4_has_feature_readonly(sb)) {
2940 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2941 sb->s_flags |= SB_RDONLY;
2945 /* Check that feature set is OK for a read-write mount */
2946 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
2947 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2948 "unsupported optional features (%x)",
2949 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2950 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2953 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
2954 ext4_msg(sb, KERN_ERR,
2955 "Can't support bigalloc feature without "
2956 "extents feature\n");
2960 #ifndef CONFIG_QUOTA
2961 if (ext4_has_feature_quota(sb) && !readonly) {
2962 ext4_msg(sb, KERN_ERR,
2963 "Filesystem with quota feature cannot be mounted RDWR "
2964 "without CONFIG_QUOTA");
2967 if (ext4_has_feature_project(sb) && !readonly) {
2968 ext4_msg(sb, KERN_ERR,
2969 "Filesystem with project quota feature cannot be mounted RDWR "
2970 "without CONFIG_QUOTA");
2973 #endif /* CONFIG_QUOTA */
2978 * This function is called once a day if we have errors logged
2979 * on the file system
2981 static void print_daily_error_info(struct timer_list *t)
2983 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
2984 struct super_block *sb = sbi->s_sb;
2985 struct ext4_super_block *es = sbi->s_es;
2987 if (es->s_error_count)
2988 /* fsck newer than v1.41.13 is needed to clean this condition. */
2989 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2990 le32_to_cpu(es->s_error_count));
2991 if (es->s_first_error_time) {
2992 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
2994 ext4_get_tstamp(es, s_first_error_time),
2995 (int) sizeof(es->s_first_error_func),
2996 es->s_first_error_func,
2997 le32_to_cpu(es->s_first_error_line));
2998 if (es->s_first_error_ino)
2999 printk(KERN_CONT ": inode %u",
3000 le32_to_cpu(es->s_first_error_ino));
3001 if (es->s_first_error_block)
3002 printk(KERN_CONT ": block %llu", (unsigned long long)
3003 le64_to_cpu(es->s_first_error_block));
3004 printk(KERN_CONT "\n");
3006 if (es->s_last_error_time) {
3007 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3009 ext4_get_tstamp(es, s_last_error_time),
3010 (int) sizeof(es->s_last_error_func),
3011 es->s_last_error_func,
3012 le32_to_cpu(es->s_last_error_line));
3013 if (es->s_last_error_ino)
3014 printk(KERN_CONT ": inode %u",
3015 le32_to_cpu(es->s_last_error_ino));
3016 if (es->s_last_error_block)
3017 printk(KERN_CONT ": block %llu", (unsigned long long)
3018 le64_to_cpu(es->s_last_error_block));
3019 printk(KERN_CONT "\n");
3021 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
3024 /* Find next suitable group and run ext4_init_inode_table */
3025 static int ext4_run_li_request(struct ext4_li_request *elr)
3027 struct ext4_group_desc *gdp = NULL;
3028 ext4_group_t group, ngroups;
3029 struct super_block *sb;
3030 unsigned long timeout = 0;
3034 ngroups = EXT4_SB(sb)->s_groups_count;
3036 for (group = elr->lr_next_group; group < ngroups; group++) {
3037 gdp = ext4_get_group_desc(sb, group, NULL);
3043 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3047 if (group >= ngroups)
3052 ret = ext4_init_inode_table(sb, group,
3053 elr->lr_timeout ? 0 : 1);
3054 if (elr->lr_timeout == 0) {
3055 timeout = (jiffies - timeout) *
3056 elr->lr_sbi->s_li_wait_mult;
3057 elr->lr_timeout = timeout;
3059 elr->lr_next_sched = jiffies + elr->lr_timeout;
3060 elr->lr_next_group = group + 1;
3066 * Remove lr_request from the list_request and free the
3067 * request structure. Should be called with li_list_mtx held
3069 static void ext4_remove_li_request(struct ext4_li_request *elr)
3071 struct ext4_sb_info *sbi;
3078 list_del(&elr->lr_request);
3079 sbi->s_li_request = NULL;
3083 static void ext4_unregister_li_request(struct super_block *sb)
3085 mutex_lock(&ext4_li_mtx);
3086 if (!ext4_li_info) {
3087 mutex_unlock(&ext4_li_mtx);
3091 mutex_lock(&ext4_li_info->li_list_mtx);
3092 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
3093 mutex_unlock(&ext4_li_info->li_list_mtx);
3094 mutex_unlock(&ext4_li_mtx);
3097 static struct task_struct *ext4_lazyinit_task;
3100 * This is the function where ext4lazyinit thread lives. It walks
3101 * through the request list searching for next scheduled filesystem.
3102 * When such a fs is found, run the lazy initialization request
3103 * (ext4_rn_li_request) and keep track of the time spend in this
3104 * function. Based on that time we compute next schedule time of
3105 * the request. When walking through the list is complete, compute
3106 * next waking time and put itself into sleep.
3108 static int ext4_lazyinit_thread(void *arg)
3110 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3111 struct list_head *pos, *n;
3112 struct ext4_li_request *elr;
3113 unsigned long next_wakeup, cur;
3115 BUG_ON(NULL == eli);
3119 next_wakeup = MAX_JIFFY_OFFSET;
3121 mutex_lock(&eli->li_list_mtx);
3122 if (list_empty(&eli->li_request_list)) {
3123 mutex_unlock(&eli->li_list_mtx);
3126 list_for_each_safe(pos, n, &eli->li_request_list) {
3129 elr = list_entry(pos, struct ext4_li_request,
3132 if (time_before(jiffies, elr->lr_next_sched)) {
3133 if (time_before(elr->lr_next_sched, next_wakeup))
3134 next_wakeup = elr->lr_next_sched;
3137 if (down_read_trylock(&elr->lr_super->s_umount)) {
3138 if (sb_start_write_trylock(elr->lr_super)) {
3141 * We hold sb->s_umount, sb can not
3142 * be removed from the list, it is
3143 * now safe to drop li_list_mtx
3145 mutex_unlock(&eli->li_list_mtx);
3146 err = ext4_run_li_request(elr);
3147 sb_end_write(elr->lr_super);
3148 mutex_lock(&eli->li_list_mtx);
3151 up_read((&elr->lr_super->s_umount));
3153 /* error, remove the lazy_init job */
3155 ext4_remove_li_request(elr);
3159 elr->lr_next_sched = jiffies +
3161 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3163 if (time_before(elr->lr_next_sched, next_wakeup))
3164 next_wakeup = elr->lr_next_sched;
3166 mutex_unlock(&eli->li_list_mtx);
3171 if ((time_after_eq(cur, next_wakeup)) ||
3172 (MAX_JIFFY_OFFSET == next_wakeup)) {
3177 schedule_timeout_interruptible(next_wakeup - cur);
3179 if (kthread_should_stop()) {
3180 ext4_clear_request_list();
3187 * It looks like the request list is empty, but we need
3188 * to check it under the li_list_mtx lock, to prevent any
3189 * additions into it, and of course we should lock ext4_li_mtx
3190 * to atomically free the list and ext4_li_info, because at
3191 * this point another ext4 filesystem could be registering
3194 mutex_lock(&ext4_li_mtx);
3195 mutex_lock(&eli->li_list_mtx);
3196 if (!list_empty(&eli->li_request_list)) {
3197 mutex_unlock(&eli->li_list_mtx);
3198 mutex_unlock(&ext4_li_mtx);
3201 mutex_unlock(&eli->li_list_mtx);
3202 kfree(ext4_li_info);
3203 ext4_li_info = NULL;
3204 mutex_unlock(&ext4_li_mtx);
3209 static void ext4_clear_request_list(void)
3211 struct list_head *pos, *n;
3212 struct ext4_li_request *elr;
3214 mutex_lock(&ext4_li_info->li_list_mtx);
3215 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3216 elr = list_entry(pos, struct ext4_li_request,
3218 ext4_remove_li_request(elr);
3220 mutex_unlock(&ext4_li_info->li_list_mtx);
3223 static int ext4_run_lazyinit_thread(void)
3225 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3226 ext4_li_info, "ext4lazyinit");
3227 if (IS_ERR(ext4_lazyinit_task)) {
3228 int err = PTR_ERR(ext4_lazyinit_task);
3229 ext4_clear_request_list();
3230 kfree(ext4_li_info);
3231 ext4_li_info = NULL;
3232 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3233 "initialization thread\n",
3237 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3242 * Check whether it make sense to run itable init. thread or not.
3243 * If there is at least one uninitialized inode table, return
3244 * corresponding group number, else the loop goes through all
3245 * groups and return total number of groups.
3247 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3249 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3250 struct ext4_group_desc *gdp = NULL;
3252 if (!ext4_has_group_desc_csum(sb))
3255 for (group = 0; group < ngroups; group++) {
3256 gdp = ext4_get_group_desc(sb, group, NULL);
3260 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3267 static int ext4_li_info_new(void)
3269 struct ext4_lazy_init *eli = NULL;
3271 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3275 INIT_LIST_HEAD(&eli->li_request_list);
3276 mutex_init(&eli->li_list_mtx);
3278 eli->li_state |= EXT4_LAZYINIT_QUIT;
3285 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3288 struct ext4_sb_info *sbi = EXT4_SB(sb);
3289 struct ext4_li_request *elr;
3291 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3297 elr->lr_next_group = start;
3300 * Randomize first schedule time of the request to
3301 * spread the inode table initialization requests
3304 elr->lr_next_sched = jiffies + (prandom_u32() %
3305 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3309 int ext4_register_li_request(struct super_block *sb,
3310 ext4_group_t first_not_zeroed)
3312 struct ext4_sb_info *sbi = EXT4_SB(sb);
3313 struct ext4_li_request *elr = NULL;
3314 ext4_group_t ngroups = sbi->s_groups_count;
3317 mutex_lock(&ext4_li_mtx);
3318 if (sbi->s_li_request != NULL) {
3320 * Reset timeout so it can be computed again, because
3321 * s_li_wait_mult might have changed.
3323 sbi->s_li_request->lr_timeout = 0;
3327 if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
3328 !test_opt(sb, INIT_INODE_TABLE))
3331 elr = ext4_li_request_new(sb, first_not_zeroed);
3337 if (NULL == ext4_li_info) {
3338 ret = ext4_li_info_new();
3343 mutex_lock(&ext4_li_info->li_list_mtx);
3344 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3345 mutex_unlock(&ext4_li_info->li_list_mtx);
3347 sbi->s_li_request = elr;
3349 * set elr to NULL here since it has been inserted to
3350 * the request_list and the removal and free of it is
3351 * handled by ext4_clear_request_list from now on.
3355 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3356 ret = ext4_run_lazyinit_thread();
3361 mutex_unlock(&ext4_li_mtx);
3368 * We do not need to lock anything since this is called on
3371 static void ext4_destroy_lazyinit_thread(void)
3374 * If thread exited earlier
3375 * there's nothing to be done.
3377 if (!ext4_li_info || !ext4_lazyinit_task)
3380 kthread_stop(ext4_lazyinit_task);
3383 static int set_journal_csum_feature_set(struct super_block *sb)
3386 int compat, incompat;
3387 struct ext4_sb_info *sbi = EXT4_SB(sb);
3389 if (ext4_has_metadata_csum(sb)) {
3390 /* journal checksum v3 */
3392 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
3394 /* journal checksum v1 */
3395 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3399 jbd2_journal_clear_features(sbi->s_journal,
3400 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3401 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3402 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3403 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3404 ret = jbd2_journal_set_features(sbi->s_journal,
3406 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3408 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3409 ret = jbd2_journal_set_features(sbi->s_journal,
3412 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3413 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3415 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3416 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3423 * Note: calculating the overhead so we can be compatible with
3424 * historical BSD practice is quite difficult in the face of
3425 * clusters/bigalloc. This is because multiple metadata blocks from
3426 * different block group can end up in the same allocation cluster.
3427 * Calculating the exact overhead in the face of clustered allocation
3428 * requires either O(all block bitmaps) in memory or O(number of block
3429 * groups**2) in time. We will still calculate the superblock for
3430 * older file systems --- and if we come across with a bigalloc file
3431 * system with zero in s_overhead_clusters the estimate will be close to
3432 * correct especially for very large cluster sizes --- but for newer
3433 * file systems, it's better to calculate this figure once at mkfs
3434 * time, and store it in the superblock. If the superblock value is
3435 * present (even for non-bigalloc file systems), we will use it.
3437 static int count_overhead(struct super_block *sb, ext4_group_t grp,
3440 struct ext4_sb_info *sbi = EXT4_SB(sb);
3441 struct ext4_group_desc *gdp;
3442 ext4_fsblk_t first_block, last_block, b;
3443 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3444 int s, j, count = 0;
3446 if (!ext4_has_feature_bigalloc(sb))
3447 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3448 sbi->s_itb_per_group + 2);
3450 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3451 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3452 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3453 for (i = 0; i < ngroups; i++) {
3454 gdp = ext4_get_group_desc(sb, i, NULL);
3455 b = ext4_block_bitmap(sb, gdp);
3456 if (b >= first_block && b <= last_block) {
3457 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3460 b = ext4_inode_bitmap(sb, gdp);
3461 if (b >= first_block && b <= last_block) {
3462 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3465 b = ext4_inode_table(sb, gdp);
3466 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3467 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3468 int c = EXT4_B2C(sbi, b - first_block);
3469 ext4_set_bit(c, buf);
3475 if (ext4_bg_has_super(sb, grp)) {
3476 ext4_set_bit(s++, buf);
3479 j = ext4_bg_num_gdb(sb, grp);
3480 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3481 ext4_error(sb, "Invalid number of block group "
3482 "descriptor blocks: %d", j);
3483 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
3487 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3491 return EXT4_CLUSTERS_PER_GROUP(sb) -
3492 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3496 * Compute the overhead and stash it in sbi->s_overhead
3498 int ext4_calculate_overhead(struct super_block *sb)
3500 struct ext4_sb_info *sbi = EXT4_SB(sb);
3501 struct ext4_super_block *es = sbi->s_es;
3502 struct inode *j_inode;
3503 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
3504 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3505 ext4_fsblk_t overhead = 0;
3506 char *buf = (char *) get_zeroed_page(GFP_NOFS);
3512 * Compute the overhead (FS structures). This is constant
3513 * for a given filesystem unless the number of block groups
3514 * changes so we cache the previous value until it does.
3518 * All of the blocks before first_data_block are overhead
3520 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3523 * Add the overhead found in each block group
3525 for (i = 0; i < ngroups; i++) {
3528 blks = count_overhead(sb, i, buf);
3531 memset(buf, 0, PAGE_SIZE);
3536 * Add the internal journal blocks whether the journal has been
3539 if (sbi->s_journal && !sbi->journal_bdev)
3540 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3541 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3542 j_inode = ext4_get_journal_inode(sb, j_inum);
3544 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3545 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3548 ext4_msg(sb, KERN_ERR, "can't get journal size");
3551 sbi->s_overhead = overhead;
3553 free_page((unsigned long) buf);
3557 static void ext4_clamp_want_extra_isize(struct super_block *sb)
3559 struct ext4_sb_info *sbi = EXT4_SB(sb);
3560 struct ext4_super_block *es = sbi->s_es;
3561 unsigned def_extra_isize = sizeof(struct ext4_inode) -
3562 EXT4_GOOD_OLD_INODE_SIZE;
3564 if (sbi->s_inode_size == EXT4_GOOD_OLD_INODE_SIZE) {
3565 sbi->s_want_extra_isize = 0;
3568 if (sbi->s_want_extra_isize < 4) {
3569 sbi->s_want_extra_isize = def_extra_isize;
3570 if (ext4_has_feature_extra_isize(sb)) {
3571 if (sbi->s_want_extra_isize <
3572 le16_to_cpu(es->s_want_extra_isize))
3573 sbi->s_want_extra_isize =
3574 le16_to_cpu(es->s_want_extra_isize);
3575 if (sbi->s_want_extra_isize <
3576 le16_to_cpu(es->s_min_extra_isize))
3577 sbi->s_want_extra_isize =
3578 le16_to_cpu(es->s_min_extra_isize);
3581 /* Check if enough inode space is available */
3582 if ((sbi->s_want_extra_isize > sbi->s_inode_size) ||
3583 (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3584 sbi->s_inode_size)) {
3585 sbi->s_want_extra_isize = def_extra_isize;
3586 ext4_msg(sb, KERN_INFO,
3587 "required extra inode space not available");
3591 static void ext4_set_resv_clusters(struct super_block *sb)
3593 ext4_fsblk_t resv_clusters;
3594 struct ext4_sb_info *sbi = EXT4_SB(sb);
3597 * There's no need to reserve anything when we aren't using extents.
3598 * The space estimates are exact, there are no unwritten extents,
3599 * hole punching doesn't need new metadata... This is needed especially
3600 * to keep ext2/3 backward compatibility.
3602 if (!ext4_has_feature_extents(sb))
3605 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3606 * This should cover the situations where we can not afford to run
3607 * out of space like for example punch hole, or converting
3608 * unwritten extents in delalloc path. In most cases such
3609 * allocation would require 1, or 2 blocks, higher numbers are
3612 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3613 sbi->s_cluster_bits);
3615 do_div(resv_clusters, 50);
3616 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3618 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
3621 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3623 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
3624 char *orig_data = kstrdup(data, GFP_KERNEL);
3625 struct buffer_head *bh;
3626 struct ext4_super_block *es = NULL;
3627 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3629 ext4_fsblk_t sb_block = get_sb_block(&data);
3630 ext4_fsblk_t logical_sb_block;
3631 unsigned long offset = 0;
3632 unsigned long journal_devnum = 0;
3633 unsigned long def_mount_opts;
3637 int blocksize, clustersize;
3638 unsigned int db_count;
3640 int needs_recovery, has_huge_files, has_bigalloc;
3643 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3644 ext4_group_t first_not_zeroed;
3646 if ((data && !orig_data) || !sbi)
3649 sbi->s_daxdev = dax_dev;
3650 sbi->s_blockgroup_lock =
3651 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3652 if (!sbi->s_blockgroup_lock)
3655 sb->s_fs_info = sbi;
3657 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3658 sbi->s_sb_block = sb_block;
3659 if (sb->s_bdev->bd_part)
3660 sbi->s_sectors_written_start =
3661 part_stat_read(sb->s_bdev->bd_part, sectors[STAT_WRITE]);
3663 /* Cleanup superblock name */
3664 strreplace(sb->s_id, '/', '!');
3666 /* -EINVAL is default */
3668 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3670 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3675 * The ext4 superblock will not be buffer aligned for other than 1kB
3676 * block sizes. We need to calculate the offset from buffer start.
3678 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3679 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3680 offset = do_div(logical_sb_block, blocksize);
3682 logical_sb_block = sb_block;
3685 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3686 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3690 * Note: s_es must be initialized as soon as possible because
3691 * some ext4 macro-instructions depend on its value
3693 es = (struct ext4_super_block *) (bh->b_data + offset);
3695 sb->s_magic = le16_to_cpu(es->s_magic);
3696 if (sb->s_magic != EXT4_SUPER_MAGIC)
3698 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3700 /* Warn if metadata_csum and gdt_csum are both set. */
3701 if (ext4_has_feature_metadata_csum(sb) &&
3702 ext4_has_feature_gdt_csum(sb))
3703 ext4_warning(sb, "metadata_csum and uninit_bg are "
3704 "redundant flags; please run fsck.");
3706 /* Check for a known checksum algorithm */
3707 if (!ext4_verify_csum_type(sb, es)) {
3708 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3709 "unknown checksum algorithm.");
3714 /* Load the checksum driver */
3715 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3716 if (IS_ERR(sbi->s_chksum_driver)) {
3717 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3718 ret = PTR_ERR(sbi->s_chksum_driver);
3719 sbi->s_chksum_driver = NULL;
3723 /* Check superblock checksum */
3724 if (!ext4_superblock_csum_verify(sb, es)) {
3725 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3726 "invalid superblock checksum. Run e2fsck?");
3732 /* Precompute checksum seed for all metadata */
3733 if (ext4_has_feature_csum_seed(sb))
3734 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3735 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
3736 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3737 sizeof(es->s_uuid));
3739 /* Set defaults before we parse the mount options */
3740 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3741 set_opt(sb, INIT_INODE_TABLE);
3742 if (def_mount_opts & EXT4_DEFM_DEBUG)
3744 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3746 if (def_mount_opts & EXT4_DEFM_UID16)
3747 set_opt(sb, NO_UID32);
3748 /* xattr user namespace & acls are now defaulted on */
3749 set_opt(sb, XATTR_USER);
3750 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3751 set_opt(sb, POSIX_ACL);
3753 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3754 if (ext4_has_metadata_csum(sb))
3755 set_opt(sb, JOURNAL_CHECKSUM);
3757 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3758 set_opt(sb, JOURNAL_DATA);
3759 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3760 set_opt(sb, ORDERED_DATA);
3761 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3762 set_opt(sb, WRITEBACK_DATA);
3764 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3765 set_opt(sb, ERRORS_PANIC);
3766 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3767 set_opt(sb, ERRORS_CONT);
3769 set_opt(sb, ERRORS_RO);
3770 /* block_validity enabled by default; disable with noblock_validity */
3771 set_opt(sb, BLOCK_VALIDITY);
3772 if (def_mount_opts & EXT4_DEFM_DISCARD)
3773 set_opt(sb, DISCARD);
3775 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3776 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3777 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3778 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3779 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3781 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3782 set_opt(sb, BARRIER);
3785 * enable delayed allocation by default
3786 * Use -o nodelalloc to turn it off
3788 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3789 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3790 set_opt(sb, DELALLOC);
3793 * set default s_li_wait_mult for lazyinit, for the case there is
3794 * no mount option specified.
3796 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3798 if (sbi->s_es->s_mount_opts[0]) {
3799 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3800 sizeof(sbi->s_es->s_mount_opts),
3804 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3805 &journal_ioprio, 0)) {
3806 ext4_msg(sb, KERN_WARNING,
3807 "failed to parse options in superblock: %s",
3810 kfree(s_mount_opts);
3812 sbi->s_def_mount_opt = sbi->s_mount_opt;
3813 if (!parse_options((char *) data, sb, &journal_devnum,
3814 &journal_ioprio, 0))
3817 #ifdef CONFIG_UNICODE
3818 if (ext4_has_feature_casefold(sb) && !sbi->s_encoding) {
3819 const struct ext4_sb_encodings *encoding_info;
3820 struct unicode_map *encoding;
3821 __u16 encoding_flags;
3823 if (ext4_has_feature_encrypt(sb)) {
3824 ext4_msg(sb, KERN_ERR,
3825 "Can't mount with encoding and encryption");
3829 if (ext4_sb_read_encoding(es, &encoding_info,
3831 ext4_msg(sb, KERN_ERR,
3832 "Encoding requested by superblock is unknown");
3836 encoding = utf8_load(encoding_info->version);
3837 if (IS_ERR(encoding)) {
3838 ext4_msg(sb, KERN_ERR,
3839 "can't mount with superblock charset: %s-%s "
3840 "not supported by the kernel. flags: 0x%x.",
3841 encoding_info->name, encoding_info->version,
3845 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
3846 "%s-%s with flags 0x%hx", encoding_info->name,
3847 encoding_info->version?:"\b", encoding_flags);
3849 sbi->s_encoding = encoding;
3850 sbi->s_encoding_flags = encoding_flags;
3854 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3855 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3856 "with data=journal disables delayed "
3857 "allocation and O_DIRECT support!\n");
3858 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3859 ext4_msg(sb, KERN_ERR, "can't mount with "
3860 "both data=journal and delalloc");
3863 if (test_opt(sb, DIOREAD_NOLOCK)) {
3864 ext4_msg(sb, KERN_ERR, "can't mount with "
3865 "both data=journal and dioread_nolock");
3868 if (test_opt(sb, DAX)) {
3869 ext4_msg(sb, KERN_ERR, "can't mount with "
3870 "both data=journal and dax");
3873 if (ext4_has_feature_encrypt(sb)) {
3874 ext4_msg(sb, KERN_WARNING,
3875 "encrypted files will use data=ordered "
3876 "instead of data journaling mode");
3878 if (test_opt(sb, DELALLOC))
3879 clear_opt(sb, DELALLOC);
3881 sb->s_iflags |= SB_I_CGROUPWB;
3884 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3885 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
3887 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3888 (ext4_has_compat_features(sb) ||
3889 ext4_has_ro_compat_features(sb) ||
3890 ext4_has_incompat_features(sb)))
3891 ext4_msg(sb, KERN_WARNING,
3892 "feature flags set on rev 0 fs, "
3893 "running e2fsck is recommended");
3895 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3896 set_opt2(sb, HURD_COMPAT);
3897 if (ext4_has_feature_64bit(sb)) {
3898 ext4_msg(sb, KERN_ERR,
3899 "The Hurd can't support 64-bit file systems");
3904 * ea_inode feature uses l_i_version field which is not
3905 * available in HURD_COMPAT mode.
3907 if (ext4_has_feature_ea_inode(sb)) {
3908 ext4_msg(sb, KERN_ERR,
3909 "ea_inode feature is not supported for Hurd");
3914 if (IS_EXT2_SB(sb)) {
3915 if (ext2_feature_set_ok(sb))
3916 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3917 "using the ext4 subsystem");
3920 * If we're probing be silent, if this looks like
3921 * it's actually an ext[34] filesystem.
3923 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3925 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3926 "to feature incompatibilities");
3931 if (IS_EXT3_SB(sb)) {
3932 if (ext3_feature_set_ok(sb))
3933 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3934 "using the ext4 subsystem");
3937 * If we're probing be silent, if this looks like
3938 * it's actually an ext4 filesystem.
3940 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3942 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3943 "to feature incompatibilities");
3949 * Check feature flags regardless of the revision level, since we
3950 * previously didn't change the revision level when setting the flags,
3951 * so there is a chance incompat flags are set on a rev 0 filesystem.
3953 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
3956 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3957 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3958 blocksize > EXT4_MAX_BLOCK_SIZE) {
3959 ext4_msg(sb, KERN_ERR,
3960 "Unsupported filesystem blocksize %d (%d log_block_size)",
3961 blocksize, le32_to_cpu(es->s_log_block_size));
3964 if (le32_to_cpu(es->s_log_block_size) >
3965 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3966 ext4_msg(sb, KERN_ERR,
3967 "Invalid log block size: %u",
3968 le32_to_cpu(es->s_log_block_size));
3971 if (le32_to_cpu(es->s_log_cluster_size) >
3972 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3973 ext4_msg(sb, KERN_ERR,
3974 "Invalid log cluster size: %u",
3975 le32_to_cpu(es->s_log_cluster_size));
3979 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3980 ext4_msg(sb, KERN_ERR,
3981 "Number of reserved GDT blocks insanely large: %d",
3982 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3986 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3987 if (ext4_has_feature_inline_data(sb)) {
3988 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
3989 " that may contain inline data");
3992 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
3993 ext4_msg(sb, KERN_ERR,
3994 "DAX unsupported by block device.");
3999 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
4000 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
4001 es->s_encryption_level);
4005 if (sb->s_blocksize != blocksize) {
4006 /* Validate the filesystem blocksize */
4007 if (!sb_set_blocksize(sb, blocksize)) {
4008 ext4_msg(sb, KERN_ERR, "bad block size %d",
4014 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
4015 offset = do_div(logical_sb_block, blocksize);
4016 bh = sb_bread_unmovable(sb, logical_sb_block);
4018 ext4_msg(sb, KERN_ERR,
4019 "Can't read superblock on 2nd try");
4022 es = (struct ext4_super_block *)(bh->b_data + offset);
4024 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
4025 ext4_msg(sb, KERN_ERR,
4026 "Magic mismatch, very weird!");
4031 has_huge_files = ext4_has_feature_huge_file(sb);
4032 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
4034 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
4036 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
4037 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
4038 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
4040 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
4041 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
4042 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
4043 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
4047 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
4048 (!is_power_of_2(sbi->s_inode_size)) ||
4049 (sbi->s_inode_size > blocksize)) {
4050 ext4_msg(sb, KERN_ERR,
4051 "unsupported inode size: %d",
4056 * i_atime_extra is the last extra field available for [acm]times in
4057 * struct ext4_inode. Checking for that field should suffice to ensure
4058 * we have extra space for all three.
4060 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
4061 sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
4062 sb->s_time_gran = 1;
4063 sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
4065 sb->s_time_gran = NSEC_PER_SEC;
4066 sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
4069 sb->s_time_min = EXT4_TIMESTAMP_MIN;
4072 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
4073 if (ext4_has_feature_64bit(sb)) {
4074 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
4075 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
4076 !is_power_of_2(sbi->s_desc_size)) {
4077 ext4_msg(sb, KERN_ERR,
4078 "unsupported descriptor size %lu",
4083 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
4085 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
4086 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
4088 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
4089 if (sbi->s_inodes_per_block == 0)
4091 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
4092 sbi->s_inodes_per_group > blocksize * 8) {
4093 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
4094 sbi->s_blocks_per_group);
4097 sbi->s_itb_per_group = sbi->s_inodes_per_group /
4098 sbi->s_inodes_per_block;
4099 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
4101 sbi->s_mount_state = le16_to_cpu(es->s_state);
4102 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
4103 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
4105 for (i = 0; i < 4; i++)
4106 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
4107 sbi->s_def_hash_version = es->s_def_hash_version;
4108 if (ext4_has_feature_dir_index(sb)) {
4109 i = le32_to_cpu(es->s_flags);
4110 if (i & EXT2_FLAGS_UNSIGNED_HASH)
4111 sbi->s_hash_unsigned = 3;
4112 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
4113 #ifdef __CHAR_UNSIGNED__
4116 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
4117 sbi->s_hash_unsigned = 3;
4121 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
4126 /* Handle clustersize */
4127 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
4128 has_bigalloc = ext4_has_feature_bigalloc(sb);
4130 if (clustersize < blocksize) {
4131 ext4_msg(sb, KERN_ERR,
4132 "cluster size (%d) smaller than "
4133 "block size (%d)", clustersize, blocksize);
4136 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4137 le32_to_cpu(es->s_log_block_size);
4138 sbi->s_clusters_per_group =
4139 le32_to_cpu(es->s_clusters_per_group);
4140 if (sbi->s_clusters_per_group > blocksize * 8) {
4141 ext4_msg(sb, KERN_ERR,
4142 "#clusters per group too big: %lu",
4143 sbi->s_clusters_per_group);
4146 if (sbi->s_blocks_per_group !=
4147 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
4148 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4149 "clusters per group (%lu) inconsistent",
4150 sbi->s_blocks_per_group,
4151 sbi->s_clusters_per_group);
4155 if (clustersize != blocksize) {
4156 ext4_msg(sb, KERN_ERR,
4157 "fragment/cluster size (%d) != "
4158 "block size (%d)", clustersize, blocksize);
4161 if (sbi->s_blocks_per_group > blocksize * 8) {
4162 ext4_msg(sb, KERN_ERR,
4163 "#blocks per group too big: %lu",
4164 sbi->s_blocks_per_group);
4167 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4168 sbi->s_cluster_bits = 0;
4170 sbi->s_cluster_ratio = clustersize / blocksize;
4172 /* Do we have standard group size of clustersize * 8 blocks ? */
4173 if (sbi->s_blocks_per_group == clustersize << 3)
4174 set_opt2(sb, STD_GROUP_SIZE);
4177 * Test whether we have more sectors than will fit in sector_t,
4178 * and whether the max offset is addressable by the page cache.
4180 err = generic_check_addressable(sb->s_blocksize_bits,
4181 ext4_blocks_count(es));
4183 ext4_msg(sb, KERN_ERR, "filesystem"
4184 " too large to mount safely on this system");
4188 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4191 /* check blocks count against device size */
4192 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
4193 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
4194 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4195 "exceeds size of device (%llu blocks)",
4196 ext4_blocks_count(es), blocks_count);
4201 * It makes no sense for the first data block to be beyond the end
4202 * of the filesystem.
4204 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
4205 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4206 "block %u is beyond end of filesystem (%llu)",
4207 le32_to_cpu(es->s_first_data_block),
4208 ext4_blocks_count(es));
4211 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4212 (sbi->s_cluster_ratio == 1)) {
4213 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4214 "block is 0 with a 1k block and cluster size");
4218 blocks_count = (ext4_blocks_count(es) -
4219 le32_to_cpu(es->s_first_data_block) +
4220 EXT4_BLOCKS_PER_GROUP(sb) - 1);
4221 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4222 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
4223 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4224 "(block count %llu, first data block %u, "
4225 "blocks per group %lu)", sbi->s_groups_count,
4226 ext4_blocks_count(es),
4227 le32_to_cpu(es->s_first_data_block),
4228 EXT4_BLOCKS_PER_GROUP(sb));
4231 sbi->s_groups_count = blocks_count;
4232 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4233 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
4234 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4235 le32_to_cpu(es->s_inodes_count)) {
4236 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4237 le32_to_cpu(es->s_inodes_count),
4238 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4242 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4243 EXT4_DESC_PER_BLOCK(sb);
4244 if (ext4_has_feature_meta_bg(sb)) {
4245 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
4246 ext4_msg(sb, KERN_WARNING,
4247 "first meta block group too large: %u "
4248 "(group descriptor block count %u)",
4249 le32_to_cpu(es->s_first_meta_bg), db_count);
4253 sbi->s_group_desc = kvmalloc_array(db_count,
4254 sizeof(struct buffer_head *),
4256 if (sbi->s_group_desc == NULL) {
4257 ext4_msg(sb, KERN_ERR, "not enough memory");
4262 bgl_lock_init(sbi->s_blockgroup_lock);
4264 /* Pre-read the descriptors into the buffer cache */
4265 for (i = 0; i < db_count; i++) {
4266 block = descriptor_loc(sb, logical_sb_block, i);
4267 sb_breadahead(sb, block);
4270 for (i = 0; i < db_count; i++) {
4271 block = descriptor_loc(sb, logical_sb_block, i);
4272 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
4273 if (!sbi->s_group_desc[i]) {
4274 ext4_msg(sb, KERN_ERR,
4275 "can't read group descriptor %d", i);
4280 sbi->s_gdb_count = db_count;
4281 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
4282 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
4283 ret = -EFSCORRUPTED;
4287 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
4289 /* Register extent status tree shrinker */
4290 if (ext4_es_register_shrinker(sbi))
4293 sbi->s_stripe = ext4_get_stripe_size(sbi);
4294 sbi->s_extent_max_zeroout_kb = 32;
4297 * set up enough so that it can read an inode
4299 sb->s_op = &ext4_sops;
4300 sb->s_export_op = &ext4_export_ops;
4301 sb->s_xattr = ext4_xattr_handlers;
4302 #ifdef CONFIG_FS_ENCRYPTION
4303 sb->s_cop = &ext4_cryptops;
4305 #ifdef CONFIG_FS_VERITY
4306 sb->s_vop = &ext4_verityops;
4309 sb->dq_op = &ext4_quota_operations;
4310 if (ext4_has_feature_quota(sb))
4311 sb->s_qcop = &dquot_quotactl_sysfile_ops;
4313 sb->s_qcop = &ext4_qctl_operations;
4314 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
4316 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
4318 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
4319 mutex_init(&sbi->s_orphan_lock);
4323 needs_recovery = (es->s_last_orphan != 0 ||
4324 ext4_has_feature_journal_needs_recovery(sb));
4326 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
4327 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
4328 goto failed_mount3a;
4331 * The first inode we look at is the journal inode. Don't try
4332 * root first: it may be modified in the journal!
4334 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4335 err = ext4_load_journal(sb, es, journal_devnum);
4337 goto failed_mount3a;
4338 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
4339 ext4_has_feature_journal_needs_recovery(sb)) {
4340 ext4_msg(sb, KERN_ERR, "required journal recovery "
4341 "suppressed and not mounted read-only");
4342 goto failed_mount_wq;
4344 /* Nojournal mode, all journal mount options are illegal */
4345 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4346 ext4_msg(sb, KERN_ERR, "can't mount with "
4347 "journal_checksum, fs mounted w/o journal");
4348 goto failed_mount_wq;
4350 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4351 ext4_msg(sb, KERN_ERR, "can't mount with "
4352 "journal_async_commit, fs mounted w/o journal");
4353 goto failed_mount_wq;
4355 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4356 ext4_msg(sb, KERN_ERR, "can't mount with "
4357 "commit=%lu, fs mounted w/o journal",
4358 sbi->s_commit_interval / HZ);
4359 goto failed_mount_wq;
4361 if (EXT4_MOUNT_DATA_FLAGS &
4362 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4363 ext4_msg(sb, KERN_ERR, "can't mount with "
4364 "data=, fs mounted w/o journal");
4365 goto failed_mount_wq;
4367 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
4368 clear_opt(sb, JOURNAL_CHECKSUM);
4369 clear_opt(sb, DATA_FLAGS);
4370 sbi->s_journal = NULL;
4375 if (ext4_has_feature_64bit(sb) &&
4376 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4377 JBD2_FEATURE_INCOMPAT_64BIT)) {
4378 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4379 goto failed_mount_wq;
4382 if (!set_journal_csum_feature_set(sb)) {
4383 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4385 goto failed_mount_wq;
4388 /* We have now updated the journal if required, so we can
4389 * validate the data journaling mode. */
4390 switch (test_opt(sb, DATA_FLAGS)) {
4392 /* No mode set, assume a default based on the journal
4393 * capabilities: ORDERED_DATA if the journal can
4394 * cope, else JOURNAL_DATA
4396 if (jbd2_journal_check_available_features
4397 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4398 set_opt(sb, ORDERED_DATA);
4399 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4401 set_opt(sb, JOURNAL_DATA);
4402 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4406 case EXT4_MOUNT_ORDERED_DATA:
4407 case EXT4_MOUNT_WRITEBACK_DATA:
4408 if (!jbd2_journal_check_available_features
4409 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4410 ext4_msg(sb, KERN_ERR, "Journal does not support "
4411 "requested data journaling mode");
4412 goto failed_mount_wq;
4418 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4419 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4420 ext4_msg(sb, KERN_ERR, "can't mount with "
4421 "journal_async_commit in data=ordered mode");
4422 goto failed_mount_wq;
4425 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4427 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4430 if (!test_opt(sb, NO_MBCACHE)) {
4431 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4432 if (!sbi->s_ea_block_cache) {
4433 ext4_msg(sb, KERN_ERR,
4434 "Failed to create ea_block_cache");
4435 goto failed_mount_wq;
4438 if (ext4_has_feature_ea_inode(sb)) {
4439 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4440 if (!sbi->s_ea_inode_cache) {
4441 ext4_msg(sb, KERN_ERR,
4442 "Failed to create ea_inode_cache");
4443 goto failed_mount_wq;
4448 if (ext4_has_feature_verity(sb) && blocksize != PAGE_SIZE) {
4449 ext4_msg(sb, KERN_ERR, "Unsupported blocksize for fs-verity");
4450 goto failed_mount_wq;
4453 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
4454 !ext4_has_feature_encrypt(sb)) {
4455 ext4_set_feature_encrypt(sb);
4456 ext4_commit_super(sb, 1);
4460 * Get the # of file system overhead blocks from the
4461 * superblock if present.
4463 if (es->s_overhead_clusters)
4464 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4466 err = ext4_calculate_overhead(sb);
4468 goto failed_mount_wq;
4472 * The maximum number of concurrent works can be high and
4473 * concurrency isn't really necessary. Limit it to 1.
4475 EXT4_SB(sb)->rsv_conversion_wq =
4476 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4477 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4478 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
4484 * The jbd2_journal_load will have done any necessary log recovery,
4485 * so we can safely mount the rest of the filesystem now.
4488 root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
4490 ext4_msg(sb, KERN_ERR, "get root inode failed");
4491 ret = PTR_ERR(root);
4495 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4496 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
4501 #ifdef CONFIG_UNICODE
4502 if (sbi->s_encoding)
4503 sb->s_d_op = &ext4_dentry_ops;
4506 sb->s_root = d_make_root(root);
4508 ext4_msg(sb, KERN_ERR, "get root dentry failed");
4513 ret = ext4_setup_super(sb, es, sb_rdonly(sb));
4514 if (ret == -EROFS) {
4515 sb->s_flags |= SB_RDONLY;
4518 goto failed_mount4a;
4520 ext4_clamp_want_extra_isize(sb);
4522 ext4_set_resv_clusters(sb);
4524 err = ext4_setup_system_zone(sb);
4526 ext4_msg(sb, KERN_ERR, "failed to initialize system "
4528 goto failed_mount4a;
4532 err = ext4_mb_init(sb);
4534 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4539 block = ext4_count_free_clusters(sb);
4540 ext4_free_blocks_count_set(sbi->s_es,
4541 EXT4_C2B(sbi, block));
4542 ext4_superblock_csum_set(sb);
4543 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4546 unsigned long freei = ext4_count_free_inodes(sb);
4547 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4548 ext4_superblock_csum_set(sb);
4549 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4553 err = percpu_counter_init(&sbi->s_dirs_counter,
4554 ext4_count_dirs(sb), GFP_KERNEL);
4556 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4559 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4562 ext4_msg(sb, KERN_ERR, "insufficient memory");
4566 if (ext4_has_feature_flex_bg(sb))
4567 if (!ext4_fill_flex_info(sb)) {
4568 ext4_msg(sb, KERN_ERR,
4569 "unable to initialize "
4570 "flex_bg meta info!");
4574 err = ext4_register_li_request(sb, first_not_zeroed);
4578 err = ext4_register_sysfs(sb);
4583 /* Enable quota usage during mount. */
4584 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
4585 err = ext4_enable_quotas(sb);
4589 #endif /* CONFIG_QUOTA */
4591 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4592 ext4_orphan_cleanup(sb, es);
4593 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4594 if (needs_recovery) {
4595 ext4_msg(sb, KERN_INFO, "recovery complete");
4596 ext4_mark_recovery_complete(sb, es);
4598 if (EXT4_SB(sb)->s_journal) {
4599 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4600 descr = " journalled data mode";
4601 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4602 descr = " ordered data mode";
4604 descr = " writeback data mode";
4606 descr = "out journal";
4608 if (test_opt(sb, DISCARD)) {
4609 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4610 if (!blk_queue_discard(q))
4611 ext4_msg(sb, KERN_WARNING,
4612 "mounting with \"discard\" option, but "
4613 "the device does not support discard");
4616 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4617 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4618 "Opts: %.*s%s%s", descr,
4619 (int) sizeof(sbi->s_es->s_mount_opts),
4620 sbi->s_es->s_mount_opts,
4621 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4623 if (es->s_error_count)
4624 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4626 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4627 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4628 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4629 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4636 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4641 ext4_unregister_sysfs(sb);
4644 ext4_unregister_li_request(sb);
4646 ext4_mb_release(sb);
4647 if (sbi->s_flex_groups)
4648 kvfree(sbi->s_flex_groups);
4649 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4650 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4651 percpu_counter_destroy(&sbi->s_dirs_counter);
4652 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4653 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
4655 ext4_ext_release(sb);
4656 ext4_release_system_zone(sb);
4661 ext4_msg(sb, KERN_ERR, "mount failed");
4662 if (EXT4_SB(sb)->rsv_conversion_wq)
4663 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4665 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4666 sbi->s_ea_inode_cache = NULL;
4668 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4669 sbi->s_ea_block_cache = NULL;
4671 if (sbi->s_journal) {
4672 jbd2_journal_destroy(sbi->s_journal);
4673 sbi->s_journal = NULL;
4676 ext4_es_unregister_shrinker(sbi);
4678 del_timer_sync(&sbi->s_err_report);
4680 kthread_stop(sbi->s_mmp_tsk);
4682 for (i = 0; i < db_count; i++)
4683 brelse(sbi->s_group_desc[i]);
4684 kvfree(sbi->s_group_desc);
4686 if (sbi->s_chksum_driver)
4687 crypto_free_shash(sbi->s_chksum_driver);
4689 #ifdef CONFIG_UNICODE
4690 utf8_unload(sbi->s_encoding);
4694 for (i = 0; i < EXT4_MAXQUOTAS; i++)
4695 kfree(get_qf_name(sb, sbi, i));
4697 ext4_blkdev_remove(sbi);
4700 sb->s_fs_info = NULL;
4701 kfree(sbi->s_blockgroup_lock);
4705 fs_put_dax(dax_dev);
4706 return err ? err : ret;
4710 * Setup any per-fs journal parameters now. We'll do this both on
4711 * initial mount, once the journal has been initialised but before we've
4712 * done any recovery; and again on any subsequent remount.
4714 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4716 struct ext4_sb_info *sbi = EXT4_SB(sb);
4718 journal->j_commit_interval = sbi->s_commit_interval;
4719 journal->j_min_batch_time = sbi->s_min_batch_time;
4720 journal->j_max_batch_time = sbi->s_max_batch_time;
4722 write_lock(&journal->j_state_lock);
4723 if (test_opt(sb, BARRIER))
4724 journal->j_flags |= JBD2_BARRIER;
4726 journal->j_flags &= ~JBD2_BARRIER;
4727 if (test_opt(sb, DATA_ERR_ABORT))
4728 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4730 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4731 write_unlock(&journal->j_state_lock);
4734 static struct inode *ext4_get_journal_inode(struct super_block *sb,
4735 unsigned int journal_inum)
4737 struct inode *journal_inode;
4740 * Test for the existence of a valid inode on disk. Bad things
4741 * happen if we iget() an unused inode, as the subsequent iput()
4742 * will try to delete it.
4744 journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
4745 if (IS_ERR(journal_inode)) {
4746 ext4_msg(sb, KERN_ERR, "no journal found");
4749 if (!journal_inode->i_nlink) {
4750 make_bad_inode(journal_inode);
4751 iput(journal_inode);
4752 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4756 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4757 journal_inode, journal_inode->i_size);
4758 if (!S_ISREG(journal_inode->i_mode)) {
4759 ext4_msg(sb, KERN_ERR, "invalid journal inode");
4760 iput(journal_inode);
4763 return journal_inode;
4766 static journal_t *ext4_get_journal(struct super_block *sb,
4767 unsigned int journal_inum)
4769 struct inode *journal_inode;
4772 BUG_ON(!ext4_has_feature_journal(sb));
4774 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4778 journal = jbd2_journal_init_inode(journal_inode);
4780 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4781 iput(journal_inode);
4784 journal->j_private = sb;
4785 ext4_init_journal_params(sb, journal);
4789 static journal_t *ext4_get_dev_journal(struct super_block *sb,
4792 struct buffer_head *bh;
4796 int hblock, blocksize;
4797 ext4_fsblk_t sb_block;
4798 unsigned long offset;
4799 struct ext4_super_block *es;
4800 struct block_device *bdev;
4802 BUG_ON(!ext4_has_feature_journal(sb));
4804 bdev = ext4_blkdev_get(j_dev, sb);
4808 blocksize = sb->s_blocksize;
4809 hblock = bdev_logical_block_size(bdev);
4810 if (blocksize < hblock) {
4811 ext4_msg(sb, KERN_ERR,
4812 "blocksize too small for journal device");
4816 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4817 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4818 set_blocksize(bdev, blocksize);
4819 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4820 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4821 "external journal");
4825 es = (struct ext4_super_block *) (bh->b_data + offset);
4826 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4827 !(le32_to_cpu(es->s_feature_incompat) &
4828 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4829 ext4_msg(sb, KERN_ERR, "external journal has "
4835 if ((le32_to_cpu(es->s_feature_ro_compat) &
4836 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4837 es->s_checksum != ext4_superblock_csum(sb, es)) {
4838 ext4_msg(sb, KERN_ERR, "external journal has "
4839 "corrupt superblock");
4844 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4845 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4850 len = ext4_blocks_count(es);
4851 start = sb_block + 1;
4852 brelse(bh); /* we're done with the superblock */
4854 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4855 start, len, blocksize);
4857 ext4_msg(sb, KERN_ERR, "failed to create device journal");
4860 journal->j_private = sb;
4861 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4862 wait_on_buffer(journal->j_sb_buffer);
4863 if (!buffer_uptodate(journal->j_sb_buffer)) {
4864 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4867 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4868 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4869 "user (unsupported) - %d",
4870 be32_to_cpu(journal->j_superblock->s_nr_users));
4873 EXT4_SB(sb)->journal_bdev = bdev;
4874 ext4_init_journal_params(sb, journal);
4878 jbd2_journal_destroy(journal);
4880 ext4_blkdev_put(bdev);
4884 static int ext4_load_journal(struct super_block *sb,
4885 struct ext4_super_block *es,
4886 unsigned long journal_devnum)
4889 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4892 int really_read_only;
4894 BUG_ON(!ext4_has_feature_journal(sb));
4896 if (journal_devnum &&
4897 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4898 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4899 "numbers have changed");
4900 journal_dev = new_decode_dev(journal_devnum);
4902 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4904 really_read_only = bdev_read_only(sb->s_bdev);
4907 * Are we loading a blank journal or performing recovery after a
4908 * crash? For recovery, we need to check in advance whether we
4909 * can get read-write access to the device.
4911 if (ext4_has_feature_journal_needs_recovery(sb)) {
4912 if (sb_rdonly(sb)) {
4913 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4914 "required on readonly filesystem");
4915 if (really_read_only) {
4916 ext4_msg(sb, KERN_ERR, "write access "
4917 "unavailable, cannot proceed "
4918 "(try mounting with noload)");
4921 ext4_msg(sb, KERN_INFO, "write access will "
4922 "be enabled during recovery");
4926 if (journal_inum && journal_dev) {
4927 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4928 "and inode journals!");
4933 if (!(journal = ext4_get_journal(sb, journal_inum)))
4936 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4940 if (!(journal->j_flags & JBD2_BARRIER))
4941 ext4_msg(sb, KERN_INFO, "barriers disabled");
4943 if (!ext4_has_feature_journal_needs_recovery(sb))
4944 err = jbd2_journal_wipe(journal, !really_read_only);
4946 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4948 memcpy(save, ((char *) es) +
4949 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4950 err = jbd2_journal_load(journal);
4952 memcpy(((char *) es) + EXT4_S_ERR_START,
4953 save, EXT4_S_ERR_LEN);
4958 ext4_msg(sb, KERN_ERR, "error loading journal");
4959 jbd2_journal_destroy(journal);
4963 EXT4_SB(sb)->s_journal = journal;
4964 ext4_clear_journal_err(sb, es);
4966 if (!really_read_only && journal_devnum &&
4967 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4968 es->s_journal_dev = cpu_to_le32(journal_devnum);
4970 /* Make sure we flush the recovery flag to disk. */
4971 ext4_commit_super(sb, 1);
4977 static int ext4_commit_super(struct super_block *sb, int sync)
4979 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4980 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4983 if (!sbh || block_device_ejected(sb))
4987 * The superblock bh should be mapped, but it might not be if the
4988 * device was hot-removed. Not much we can do but fail the I/O.
4990 if (!buffer_mapped(sbh))
4994 * If the file system is mounted read-only, don't update the
4995 * superblock write time. This avoids updating the superblock
4996 * write time when we are mounting the root file system
4997 * read/only but we need to replay the journal; at that point,
4998 * for people who are east of GMT and who make their clock
4999 * tick in localtime for Windows bug-for-bug compatibility,
5000 * the clock is set in the future, and this will cause e2fsck
5001 * to complain and force a full file system check.
5003 if (!(sb->s_flags & SB_RDONLY))
5004 ext4_update_tstamp(es, s_wtime);
5005 if (sb->s_bdev->bd_part)
5006 es->s_kbytes_written =
5007 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
5008 ((part_stat_read(sb->s_bdev->bd_part,
5009 sectors[STAT_WRITE]) -
5010 EXT4_SB(sb)->s_sectors_written_start) >> 1));
5012 es->s_kbytes_written =
5013 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
5014 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
5015 ext4_free_blocks_count_set(es,
5016 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
5017 &EXT4_SB(sb)->s_freeclusters_counter)));
5018 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
5019 es->s_free_inodes_count =
5020 cpu_to_le32(percpu_counter_sum_positive(
5021 &EXT4_SB(sb)->s_freeinodes_counter));
5022 BUFFER_TRACE(sbh, "marking dirty");
5023 ext4_superblock_csum_set(sb);
5026 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
5028 * Oh, dear. A previous attempt to write the
5029 * superblock failed. This could happen because the
5030 * USB device was yanked out. Or it could happen to
5031 * be a transient write error and maybe the block will
5032 * be remapped. Nothing we can do but to retry the
5033 * write and hope for the best.
5035 ext4_msg(sb, KERN_ERR, "previous I/O error to "
5036 "superblock detected");
5037 clear_buffer_write_io_error(sbh);
5038 set_buffer_uptodate(sbh);
5040 mark_buffer_dirty(sbh);
5043 error = __sync_dirty_buffer(sbh,
5044 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
5045 if (buffer_write_io_error(sbh)) {
5046 ext4_msg(sb, KERN_ERR, "I/O error while writing "
5048 clear_buffer_write_io_error(sbh);
5049 set_buffer_uptodate(sbh);
5056 * Have we just finished recovery? If so, and if we are mounting (or
5057 * remounting) the filesystem readonly, then we will end up with a
5058 * consistent fs on disk. Record that fact.
5060 static void ext4_mark_recovery_complete(struct super_block *sb,
5061 struct ext4_super_block *es)
5063 journal_t *journal = EXT4_SB(sb)->s_journal;
5065 if (!ext4_has_feature_journal(sb)) {
5066 BUG_ON(journal != NULL);
5069 jbd2_journal_lock_updates(journal);
5070 if (jbd2_journal_flush(journal) < 0)
5073 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
5074 ext4_clear_feature_journal_needs_recovery(sb);
5075 ext4_commit_super(sb, 1);
5079 jbd2_journal_unlock_updates(journal);
5083 * If we are mounting (or read-write remounting) a filesystem whose journal
5084 * has recorded an error from a previous lifetime, move that error to the
5085 * main filesystem now.
5087 static void ext4_clear_journal_err(struct super_block *sb,
5088 struct ext4_super_block *es)
5094 BUG_ON(!ext4_has_feature_journal(sb));
5096 journal = EXT4_SB(sb)->s_journal;
5099 * Now check for any error status which may have been recorded in the
5100 * journal by a prior ext4_error() or ext4_abort()
5103 j_errno = jbd2_journal_errno(journal);
5107 errstr = ext4_decode_error(sb, j_errno, nbuf);
5108 ext4_warning(sb, "Filesystem error recorded "
5109 "from previous mount: %s", errstr);
5110 ext4_warning(sb, "Marking fs in need of filesystem check.");
5112 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
5113 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
5114 ext4_commit_super(sb, 1);
5116 jbd2_journal_clear_err(journal);
5117 jbd2_journal_update_sb_errno(journal);
5122 * Force the running and committing transactions to commit,
5123 * and wait on the commit.
5125 int ext4_force_commit(struct super_block *sb)
5132 journal = EXT4_SB(sb)->s_journal;
5133 return ext4_journal_force_commit(journal);
5136 static int ext4_sync_fs(struct super_block *sb, int wait)
5140 bool needs_barrier = false;
5141 struct ext4_sb_info *sbi = EXT4_SB(sb);
5143 if (unlikely(ext4_forced_shutdown(sbi)))
5146 trace_ext4_sync_fs(sb, wait);
5147 flush_workqueue(sbi->rsv_conversion_wq);
5149 * Writeback quota in non-journalled quota case - journalled quota has
5152 dquot_writeback_dquots(sb, -1);
5154 * Data writeback is possible w/o journal transaction, so barrier must
5155 * being sent at the end of the function. But we can skip it if
5156 * transaction_commit will do it for us.
5158 if (sbi->s_journal) {
5159 target = jbd2_get_latest_transaction(sbi->s_journal);
5160 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
5161 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
5162 needs_barrier = true;
5164 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
5166 ret = jbd2_log_wait_commit(sbi->s_journal,
5169 } else if (wait && test_opt(sb, BARRIER))
5170 needs_barrier = true;
5171 if (needs_barrier) {
5173 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
5182 * LVM calls this function before a (read-only) snapshot is created. This
5183 * gives us a chance to flush the journal completely and mark the fs clean.
5185 * Note that only this function cannot bring a filesystem to be in a clean
5186 * state independently. It relies on upper layer to stop all data & metadata
5189 static int ext4_freeze(struct super_block *sb)
5197 journal = EXT4_SB(sb)->s_journal;
5200 /* Now we set up the journal barrier. */
5201 jbd2_journal_lock_updates(journal);
5204 * Don't clear the needs_recovery flag if we failed to
5205 * flush the journal.
5207 error = jbd2_journal_flush(journal);
5211 /* Journal blocked and flushed, clear needs_recovery flag. */
5212 ext4_clear_feature_journal_needs_recovery(sb);
5215 error = ext4_commit_super(sb, 1);
5218 /* we rely on upper layer to stop further updates */
5219 jbd2_journal_unlock_updates(journal);
5224 * Called by LVM after the snapshot is done. We need to reset the RECOVER
5225 * flag here, even though the filesystem is not technically dirty yet.
5227 static int ext4_unfreeze(struct super_block *sb)
5229 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
5232 if (EXT4_SB(sb)->s_journal) {
5233 /* Reset the needs_recovery flag before the fs is unlocked. */
5234 ext4_set_feature_journal_needs_recovery(sb);
5237 ext4_commit_super(sb, 1);
5242 * Structure to save mount options for ext4_remount's benefit
5244 struct ext4_mount_options {
5245 unsigned long s_mount_opt;
5246 unsigned long s_mount_opt2;
5249 unsigned long s_commit_interval;
5250 u32 s_min_batch_time, s_max_batch_time;
5253 char *s_qf_names[EXT4_MAXQUOTAS];
5257 static int ext4_remount(struct super_block *sb, int *flags, char *data)
5259 struct ext4_super_block *es;
5260 struct ext4_sb_info *sbi = EXT4_SB(sb);
5261 unsigned long old_sb_flags;
5262 struct ext4_mount_options old_opts;
5263 int enable_quota = 0;
5265 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
5269 char *to_free[EXT4_MAXQUOTAS];
5271 char *orig_data = kstrdup(data, GFP_KERNEL);
5273 if (data && !orig_data)
5276 /* Store the original options */
5277 old_sb_flags = sb->s_flags;
5278 old_opts.s_mount_opt = sbi->s_mount_opt;
5279 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
5280 old_opts.s_resuid = sbi->s_resuid;
5281 old_opts.s_resgid = sbi->s_resgid;
5282 old_opts.s_commit_interval = sbi->s_commit_interval;
5283 old_opts.s_min_batch_time = sbi->s_min_batch_time;
5284 old_opts.s_max_batch_time = sbi->s_max_batch_time;
5286 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
5287 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5288 if (sbi->s_qf_names[i]) {
5289 char *qf_name = get_qf_name(sb, sbi, i);
5291 old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
5292 if (!old_opts.s_qf_names[i]) {
5293 for (j = 0; j < i; j++)
5294 kfree(old_opts.s_qf_names[j]);
5299 old_opts.s_qf_names[i] = NULL;
5301 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5302 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
5304 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
5309 ext4_clamp_want_extra_isize(sb);
5311 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
5312 test_opt(sb, JOURNAL_CHECKSUM)) {
5313 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
5314 "during remount not supported; ignoring");
5315 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
5318 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5319 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5320 ext4_msg(sb, KERN_ERR, "can't mount with "
5321 "both data=journal and delalloc");
5325 if (test_opt(sb, DIOREAD_NOLOCK)) {
5326 ext4_msg(sb, KERN_ERR, "can't mount with "
5327 "both data=journal and dioread_nolock");
5331 if (test_opt(sb, DAX)) {
5332 ext4_msg(sb, KERN_ERR, "can't mount with "
5333 "both data=journal and dax");
5337 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5338 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5339 ext4_msg(sb, KERN_ERR, "can't mount with "
5340 "journal_async_commit in data=ordered mode");
5346 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5347 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5352 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
5353 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
5354 "dax flag with busy inodes while remounting");
5355 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
5358 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
5359 ext4_abort(sb, "Abort forced by user");
5361 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5362 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
5366 if (sbi->s_journal) {
5367 ext4_init_journal_params(sb, sbi->s_journal);
5368 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5371 if (*flags & SB_LAZYTIME)
5372 sb->s_flags |= SB_LAZYTIME;
5374 if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
5375 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
5380 if (*flags & SB_RDONLY) {
5381 err = sync_filesystem(sb);
5384 err = dquot_suspend(sb, -1);
5389 * First of all, the unconditional stuff we have to do
5390 * to disable replay of the journal when we next remount
5392 sb->s_flags |= SB_RDONLY;
5395 * OK, test if we are remounting a valid rw partition
5396 * readonly, and if so set the rdonly flag and then
5397 * mark the partition as valid again.
5399 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5400 (sbi->s_mount_state & EXT4_VALID_FS))
5401 es->s_state = cpu_to_le16(sbi->s_mount_state);
5404 ext4_mark_recovery_complete(sb, es);
5406 kthread_stop(sbi->s_mmp_tsk);
5408 /* Make sure we can mount this feature set readwrite */
5409 if (ext4_has_feature_readonly(sb) ||
5410 !ext4_feature_set_ok(sb, 0)) {
5415 * Make sure the group descriptor checksums
5416 * are sane. If they aren't, refuse to remount r/w.
5418 for (g = 0; g < sbi->s_groups_count; g++) {
5419 struct ext4_group_desc *gdp =
5420 ext4_get_group_desc(sb, g, NULL);
5422 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
5423 ext4_msg(sb, KERN_ERR,
5424 "ext4_remount: Checksum for group %u failed (%u!=%u)",
5425 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
5426 le16_to_cpu(gdp->bg_checksum));
5433 * If we have an unprocessed orphan list hanging
5434 * around from a previously readonly bdev mount,
5435 * require a full umount/remount for now.
5437 if (es->s_last_orphan) {
5438 ext4_msg(sb, KERN_WARNING, "Couldn't "
5439 "remount RDWR because of unprocessed "
5440 "orphan inode list. Please "
5441 "umount/remount instead");
5447 * Mounting a RDONLY partition read-write, so reread
5448 * and store the current valid flag. (It may have
5449 * been changed by e2fsck since we originally mounted
5453 ext4_clear_journal_err(sb, es);
5454 sbi->s_mount_state = le16_to_cpu(es->s_state);
5456 err = ext4_setup_super(sb, es, 0);
5460 sb->s_flags &= ~SB_RDONLY;
5461 if (ext4_has_feature_mmp(sb))
5462 if (ext4_multi_mount_protect(sb,
5463 le64_to_cpu(es->s_mmp_block))) {
5472 * Reinitialize lazy itable initialization thread based on
5475 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
5476 ext4_unregister_li_request(sb);
5478 ext4_group_t first_not_zeroed;
5479 first_not_zeroed = ext4_has_uninit_itable(sb);
5480 ext4_register_li_request(sb, first_not_zeroed);
5483 ext4_setup_system_zone(sb);
5484 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
5485 err = ext4_commit_super(sb, 1);
5491 /* Release old quota file names */
5492 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5493 kfree(old_opts.s_qf_names[i]);
5495 if (sb_any_quota_suspended(sb))
5496 dquot_resume(sb, -1);
5497 else if (ext4_has_feature_quota(sb)) {
5498 err = ext4_enable_quotas(sb);
5505 *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
5506 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5511 sb->s_flags = old_sb_flags;
5512 sbi->s_mount_opt = old_opts.s_mount_opt;
5513 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
5514 sbi->s_resuid = old_opts.s_resuid;
5515 sbi->s_resgid = old_opts.s_resgid;
5516 sbi->s_commit_interval = old_opts.s_commit_interval;
5517 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5518 sbi->s_max_batch_time = old_opts.s_max_batch_time;
5520 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
5521 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
5522 to_free[i] = get_qf_name(sb, sbi, i);
5523 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
5526 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5534 static int ext4_statfs_project(struct super_block *sb,
5535 kprojid_t projid, struct kstatfs *buf)
5538 struct dquot *dquot;
5542 qid = make_kqid_projid(projid);
5543 dquot = dqget(sb, qid);
5545 return PTR_ERR(dquot);
5546 spin_lock(&dquot->dq_dqb_lock);
5548 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5549 dquot->dq_dqb.dqb_bsoftlimit :
5550 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5551 if (limit && buf->f_blocks > limit) {
5552 curblock = (dquot->dq_dqb.dqb_curspace +
5553 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
5554 buf->f_blocks = limit;
5555 buf->f_bfree = buf->f_bavail =
5556 (buf->f_blocks > curblock) ?
5557 (buf->f_blocks - curblock) : 0;
5560 limit = dquot->dq_dqb.dqb_isoftlimit ?
5561 dquot->dq_dqb.dqb_isoftlimit :
5562 dquot->dq_dqb.dqb_ihardlimit;
5563 if (limit && buf->f_files > limit) {
5564 buf->f_files = limit;
5566 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5567 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5570 spin_unlock(&dquot->dq_dqb_lock);
5576 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5578 struct super_block *sb = dentry->d_sb;
5579 struct ext4_sb_info *sbi = EXT4_SB(sb);
5580 struct ext4_super_block *es = sbi->s_es;
5581 ext4_fsblk_t overhead = 0, resv_blocks;
5584 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5586 if (!test_opt(sb, MINIX_DF))
5587 overhead = sbi->s_overhead;
5589 buf->f_type = EXT4_SUPER_MAGIC;
5590 buf->f_bsize = sb->s_blocksize;
5591 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5592 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5593 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5594 /* prevent underflow in case that few free space is available */
5595 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
5596 buf->f_bavail = buf->f_bfree -
5597 (ext4_r_blocks_count(es) + resv_blocks);
5598 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5600 buf->f_files = le32_to_cpu(es->s_inodes_count);
5601 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5602 buf->f_namelen = EXT4_NAME_LEN;
5603 fsid = le64_to_cpup((void *)es->s_uuid) ^
5604 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5605 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5606 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
5609 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5610 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5611 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5620 * Helper functions so that transaction is started before we acquire dqio_sem
5621 * to keep correct lock ordering of transaction > dqio_sem
5623 static inline struct inode *dquot_to_inode(struct dquot *dquot)
5625 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5628 static int ext4_write_dquot(struct dquot *dquot)
5632 struct inode *inode;
5634 inode = dquot_to_inode(dquot);
5635 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5636 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5638 return PTR_ERR(handle);
5639 ret = dquot_commit(dquot);
5640 err = ext4_journal_stop(handle);
5646 static int ext4_acquire_dquot(struct dquot *dquot)
5651 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5652 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5654 return PTR_ERR(handle);
5655 ret = dquot_acquire(dquot);
5656 err = ext4_journal_stop(handle);
5662 static int ext4_release_dquot(struct dquot *dquot)
5667 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5668 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
5669 if (IS_ERR(handle)) {
5670 /* Release dquot anyway to avoid endless cycle in dqput() */
5671 dquot_release(dquot);
5672 return PTR_ERR(handle);
5674 ret = dquot_release(dquot);
5675 err = ext4_journal_stop(handle);
5681 static int ext4_mark_dquot_dirty(struct dquot *dquot)
5683 struct super_block *sb = dquot->dq_sb;
5684 struct ext4_sb_info *sbi = EXT4_SB(sb);
5686 /* Are we journaling quotas? */
5687 if (ext4_has_feature_quota(sb) ||
5688 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5689 dquot_mark_dquot_dirty(dquot);
5690 return ext4_write_dquot(dquot);
5692 return dquot_mark_dquot_dirty(dquot);
5696 static int ext4_write_info(struct super_block *sb, int type)
5701 /* Data block + inode block */
5702 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
5704 return PTR_ERR(handle);
5705 ret = dquot_commit_info(sb, type);
5706 err = ext4_journal_stop(handle);
5713 * Turn on quotas during mount time - we need to find
5714 * the quota file and such...
5716 static int ext4_quota_on_mount(struct super_block *sb, int type)
5718 return dquot_quota_on_mount(sb, get_qf_name(sb, EXT4_SB(sb), type),
5719 EXT4_SB(sb)->s_jquota_fmt, type);
5722 static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5724 struct ext4_inode_info *ei = EXT4_I(inode);
5726 /* The first argument of lockdep_set_subclass has to be
5727 * *exactly* the same as the argument to init_rwsem() --- in
5728 * this case, in init_once() --- or lockdep gets unhappy
5729 * because the name of the lock is set using the
5730 * stringification of the argument to init_rwsem().
5732 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5733 lockdep_set_subclass(&ei->i_data_sem, subclass);
5737 * Standard function to be called on quota_on
5739 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5740 const struct path *path)
5744 if (!test_opt(sb, QUOTA))
5747 /* Quotafile not on the same filesystem? */
5748 if (path->dentry->d_sb != sb)
5750 /* Journaling quota? */
5751 if (EXT4_SB(sb)->s_qf_names[type]) {
5752 /* Quotafile not in fs root? */
5753 if (path->dentry->d_parent != sb->s_root)
5754 ext4_msg(sb, KERN_WARNING,
5755 "Quota file not on filesystem root. "
5756 "Journaled quota will not work");
5757 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5760 * Clear the flag just in case mount options changed since
5763 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
5767 * When we journal data on quota file, we have to flush journal to see
5768 * all updates to the file when we bypass pagecache...
5770 if (EXT4_SB(sb)->s_journal &&
5771 ext4_should_journal_data(d_inode(path->dentry))) {
5773 * We don't need to lock updates but journal_flush() could
5774 * otherwise be livelocked...
5776 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5777 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5778 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5783 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5784 err = dquot_quota_on(sb, type, format_id, path);
5786 lockdep_set_quota_inode(path->dentry->d_inode,
5789 struct inode *inode = d_inode(path->dentry);
5793 * Set inode flags to prevent userspace from messing with quota
5794 * files. If this fails, we return success anyway since quotas
5795 * are already enabled and this is not a hard failure.
5798 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5801 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5802 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5803 S_NOATIME | S_IMMUTABLE);
5804 ext4_mark_inode_dirty(handle, inode);
5805 ext4_journal_stop(handle);
5807 inode_unlock(inode);
5812 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5816 struct inode *qf_inode;
5817 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5818 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5819 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5820 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5823 BUG_ON(!ext4_has_feature_quota(sb));
5825 if (!qf_inums[type])
5828 qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
5829 if (IS_ERR(qf_inode)) {
5830 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5831 return PTR_ERR(qf_inode);
5834 /* Don't account quota for quota files to avoid recursion */
5835 qf_inode->i_flags |= S_NOQUOTA;
5836 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
5837 err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
5839 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
5845 /* Enable usage tracking for all quota types. */
5846 static int ext4_enable_quotas(struct super_block *sb)
5849 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5850 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5851 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5852 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5854 bool quota_mopt[EXT4_MAXQUOTAS] = {
5855 test_opt(sb, USRQUOTA),
5856 test_opt(sb, GRPQUOTA),
5857 test_opt(sb, PRJQUOTA),
5860 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
5861 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5862 if (qf_inums[type]) {
5863 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5864 DQUOT_USAGE_ENABLED |
5865 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
5868 "Failed to enable quota tracking "
5869 "(type=%d, err=%d). Please run "
5870 "e2fsck to fix.", type, err);
5871 for (type--; type >= 0; type--)
5872 dquot_quota_off(sb, type);
5881 static int ext4_quota_off(struct super_block *sb, int type)
5883 struct inode *inode = sb_dqopt(sb)->files[type];
5887 /* Force all delayed allocation blocks to be allocated.
5888 * Caller already holds s_umount sem */
5889 if (test_opt(sb, DELALLOC))
5890 sync_filesystem(sb);
5892 if (!inode || !igrab(inode))
5895 err = dquot_quota_off(sb, type);
5896 if (err || ext4_has_feature_quota(sb))
5901 * Update modification times of quota files when userspace can
5902 * start looking at them. If we fail, we return success anyway since
5903 * this is not a hard failure and quotas are already disabled.
5905 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5908 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5909 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
5910 inode->i_mtime = inode->i_ctime = current_time(inode);
5911 ext4_mark_inode_dirty(handle, inode);
5912 ext4_journal_stop(handle);
5914 inode_unlock(inode);
5916 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
5920 return dquot_quota_off(sb, type);
5923 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5924 * acquiring the locks... As quota files are never truncated and quota code
5925 * itself serializes the operations (and no one else should touch the files)
5926 * we don't have to be afraid of races */
5927 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5928 size_t len, loff_t off)
5930 struct inode *inode = sb_dqopt(sb)->files[type];
5931 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5932 int offset = off & (sb->s_blocksize - 1);
5935 struct buffer_head *bh;
5936 loff_t i_size = i_size_read(inode);
5940 if (off+len > i_size)
5943 while (toread > 0) {
5944 tocopy = sb->s_blocksize - offset < toread ?
5945 sb->s_blocksize - offset : toread;
5946 bh = ext4_bread(NULL, inode, blk, 0);
5949 if (!bh) /* A hole? */
5950 memset(data, 0, tocopy);
5952 memcpy(data, bh->b_data+offset, tocopy);
5962 /* Write to quotafile (we know the transaction is already started and has
5963 * enough credits) */
5964 static ssize_t ext4_quota_write(struct super_block *sb, int type,
5965 const char *data, size_t len, loff_t off)
5967 struct inode *inode = sb_dqopt(sb)->files[type];
5968 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5969 int err, offset = off & (sb->s_blocksize - 1);
5971 struct buffer_head *bh;
5972 handle_t *handle = journal_current_handle();
5974 if (EXT4_SB(sb)->s_journal && !handle) {
5975 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5976 " cancelled because transaction is not started",
5977 (unsigned long long)off, (unsigned long long)len);
5981 * Since we account only one data block in transaction credits,
5982 * then it is impossible to cross a block boundary.
5984 if (sb->s_blocksize - offset < len) {
5985 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5986 " cancelled because not block aligned",
5987 (unsigned long long)off, (unsigned long long)len);
5992 bh = ext4_bread(handle, inode, blk,
5993 EXT4_GET_BLOCKS_CREATE |
5994 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5995 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5996 ext4_should_retry_alloc(inode->i_sb, &retries));
6001 BUFFER_TRACE(bh, "get write access");
6002 err = ext4_journal_get_write_access(handle, bh);
6008 memcpy(bh->b_data+offset, data, len);
6009 flush_dcache_page(bh->b_page);
6011 err = ext4_handle_dirty_metadata(handle, NULL, bh);
6014 if (inode->i_size < off + len) {
6015 i_size_write(inode, off + len);
6016 EXT4_I(inode)->i_disksize = inode->i_size;
6017 ext4_mark_inode_dirty(handle, inode);
6023 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
6024 const char *dev_name, void *data)
6026 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
6029 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
6030 static inline void register_as_ext2(void)
6032 int err = register_filesystem(&ext2_fs_type);
6035 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
6038 static inline void unregister_as_ext2(void)
6040 unregister_filesystem(&ext2_fs_type);
6043 static inline int ext2_feature_set_ok(struct super_block *sb)
6045 if (ext4_has_unknown_ext2_incompat_features(sb))
6049 if (ext4_has_unknown_ext2_ro_compat_features(sb))
6054 static inline void register_as_ext2(void) { }
6055 static inline void unregister_as_ext2(void) { }
6056 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
6059 static inline void register_as_ext3(void)
6061 int err = register_filesystem(&ext3_fs_type);
6064 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
6067 static inline void unregister_as_ext3(void)
6069 unregister_filesystem(&ext3_fs_type);
6072 static inline int ext3_feature_set_ok(struct super_block *sb)
6074 if (ext4_has_unknown_ext3_incompat_features(sb))
6076 if (!ext4_has_feature_journal(sb))
6080 if (ext4_has_unknown_ext3_ro_compat_features(sb))
6085 static struct file_system_type ext4_fs_type = {
6086 .owner = THIS_MODULE,
6088 .mount = ext4_mount,
6089 .kill_sb = kill_block_super,
6090 .fs_flags = FS_REQUIRES_DEV,
6092 MODULE_ALIAS_FS("ext4");
6094 /* Shared across all ext4 file systems */
6095 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
6097 static int __init ext4_init_fs(void)
6101 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
6102 ext4_li_info = NULL;
6103 mutex_init(&ext4_li_mtx);
6105 /* Build-time check for flags consistency */
6106 ext4_check_flag_values();
6108 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
6109 init_waitqueue_head(&ext4__ioend_wq[i]);
6111 err = ext4_init_es();
6115 err = ext4_init_pending();
6119 err = ext4_init_post_read_processing();
6123 err = ext4_init_pageio();
6127 err = ext4_init_system_zone();
6131 err = ext4_init_sysfs();
6135 err = ext4_init_mballoc();
6138 err = init_inodecache();
6143 err = register_filesystem(&ext4_fs_type);
6149 unregister_as_ext2();
6150 unregister_as_ext3();
6151 destroy_inodecache();
6153 ext4_exit_mballoc();
6157 ext4_exit_system_zone();
6161 ext4_exit_post_read_processing();
6163 ext4_exit_pending();
6170 static void __exit ext4_exit_fs(void)
6172 ext4_destroy_lazyinit_thread();
6173 unregister_as_ext2();
6174 unregister_as_ext3();
6175 unregister_filesystem(&ext4_fs_type);
6176 destroy_inodecache();
6177 ext4_exit_mballoc();
6179 ext4_exit_system_zone();
6181 ext4_exit_post_read_processing();
6183 ext4_exit_pending();
6186 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
6187 MODULE_DESCRIPTION("Fourth Extended Filesystem");
6188 MODULE_LICENSE("GPL");
6189 MODULE_SOFTDEP("pre: crc32c");
6190 module_init(ext4_init_fs)
6191 module_exit(ext4_exit_fs)