2 * linux/fs/ext4/super.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/time.h>
23 #include <linux/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/buffer_head.h>
30 #include <linux/exportfs.h>
31 #include <linux/vfs.h>
32 #include <linux/random.h>
33 #include <linux/mount.h>
34 #include <linux/namei.h>
35 #include <linux/quotaops.h>
36 #include <linux/seq_file.h>
37 #include <linux/proc_fs.h>
38 #include <linux/ctype.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <linux/cleancache.h>
42 #include <asm/uaccess.h>
44 #include <linux/kthread.h>
45 #include <linux/freezer.h>
48 #include "ext4_extents.h"
49 #include "ext4_jbd2.h"
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/ext4.h>
57 static struct proc_dir_entry *ext4_proc_root;
58 static struct kset *ext4_kset;
59 static struct ext4_lazy_init *ext4_li_info;
60 static struct mutex ext4_li_mtx;
61 static struct ext4_features *ext4_feat;
63 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
64 unsigned long journal_devnum);
65 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
66 static int ext4_commit_super(struct super_block *sb, int sync);
67 static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69 static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
71 static int ext4_sync_fs(struct super_block *sb, int wait);
72 static const char *ext4_decode_error(struct super_block *sb, int errno,
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 void ext4_write_super(struct super_block *sb);
78 static int ext4_freeze(struct super_block *sb);
79 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
80 const char *dev_name, void *data);
81 static inline int ext2_feature_set_ok(struct super_block *sb);
82 static inline int ext3_feature_set_ok(struct super_block *sb);
83 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
84 static void ext4_destroy_lazyinit_thread(void);
85 static void ext4_unregister_li_request(struct super_block *sb);
86 static void ext4_clear_request_list(void);
88 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
89 static struct file_system_type ext2_fs_type = {
93 .kill_sb = kill_block_super,
94 .fs_flags = FS_REQUIRES_DEV,
96 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
98 #define IS_EXT2_SB(sb) (0)
102 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
103 static struct file_system_type ext3_fs_type = {
104 .owner = THIS_MODULE,
107 .kill_sb = kill_block_super,
108 .fs_flags = FS_REQUIRES_DEV,
110 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
112 #define IS_EXT3_SB(sb) (0)
115 static int ext4_verify_csum_type(struct super_block *sb,
116 struct ext4_super_block *es)
118 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
119 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
122 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
125 static __le32 ext4_superblock_csum(struct super_block *sb,
126 struct ext4_super_block *es)
128 struct ext4_sb_info *sbi = EXT4_SB(sb);
129 int offset = offsetof(struct ext4_super_block, s_checksum);
132 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
134 return cpu_to_le32(csum);
137 int ext4_superblock_csum_verify(struct super_block *sb,
138 struct ext4_super_block *es)
140 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
141 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
144 return es->s_checksum == ext4_superblock_csum(sb, es);
147 void ext4_superblock_csum_set(struct super_block *sb,
148 struct ext4_super_block *es)
150 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
151 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
154 es->s_checksum = ext4_superblock_csum(sb, es);
157 void *ext4_kvmalloc(size_t size, gfp_t flags)
161 ret = kmalloc(size, flags);
163 ret = __vmalloc(size, flags, PAGE_KERNEL);
167 void *ext4_kvzalloc(size_t size, gfp_t flags)
171 ret = kzalloc(size, flags);
173 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
177 void ext4_kvfree(void *ptr)
179 if (is_vmalloc_addr(ptr))
186 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
187 struct ext4_group_desc *bg)
189 return le32_to_cpu(bg->bg_block_bitmap_lo) |
190 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
191 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
194 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
195 struct ext4_group_desc *bg)
197 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
198 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
199 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
202 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
203 struct ext4_group_desc *bg)
205 return le32_to_cpu(bg->bg_inode_table_lo) |
206 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
207 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
210 __u32 ext4_free_group_clusters(struct super_block *sb,
211 struct ext4_group_desc *bg)
213 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
214 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
215 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
218 __u32 ext4_free_inodes_count(struct super_block *sb,
219 struct ext4_group_desc *bg)
221 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
222 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
223 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
226 __u32 ext4_used_dirs_count(struct super_block *sb,
227 struct ext4_group_desc *bg)
229 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
230 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
231 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
234 __u32 ext4_itable_unused_count(struct super_block *sb,
235 struct ext4_group_desc *bg)
237 return le16_to_cpu(bg->bg_itable_unused_lo) |
238 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
239 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
242 void ext4_block_bitmap_set(struct super_block *sb,
243 struct ext4_group_desc *bg, ext4_fsblk_t blk)
245 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
246 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
247 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
250 void ext4_inode_bitmap_set(struct super_block *sb,
251 struct ext4_group_desc *bg, ext4_fsblk_t blk)
253 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
254 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
255 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
258 void ext4_inode_table_set(struct super_block *sb,
259 struct ext4_group_desc *bg, ext4_fsblk_t blk)
261 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
262 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
263 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
266 void ext4_free_group_clusters_set(struct super_block *sb,
267 struct ext4_group_desc *bg, __u32 count)
269 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
270 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
271 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
274 void ext4_free_inodes_set(struct super_block *sb,
275 struct ext4_group_desc *bg, __u32 count)
277 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
278 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
279 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
282 void ext4_used_dirs_set(struct super_block *sb,
283 struct ext4_group_desc *bg, __u32 count)
285 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
286 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
287 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
290 void ext4_itable_unused_set(struct super_block *sb,
291 struct ext4_group_desc *bg, __u32 count)
293 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
294 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
295 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
299 /* Just increment the non-pointer handle value */
300 static handle_t *ext4_get_nojournal(void)
302 handle_t *handle = current->journal_info;
303 unsigned long ref_cnt = (unsigned long)handle;
305 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
308 handle = (handle_t *)ref_cnt;
310 current->journal_info = handle;
315 /* Decrement the non-pointer handle value */
316 static void ext4_put_nojournal(handle_t *handle)
318 unsigned long ref_cnt = (unsigned long)handle;
320 BUG_ON(ref_cnt == 0);
323 handle = (handle_t *)ref_cnt;
325 current->journal_info = handle;
329 * Wrappers for jbd2_journal_start/end.
331 * The only special thing we need to do here is to make sure that all
332 * journal_end calls result in the superblock being marked dirty, so
333 * that sync() will call the filesystem's write_super callback if
336 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
340 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
341 if (sb->s_flags & MS_RDONLY)
342 return ERR_PTR(-EROFS);
344 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
345 journal = EXT4_SB(sb)->s_journal;
347 return ext4_get_nojournal();
349 * Special case here: if the journal has aborted behind our
350 * backs (eg. EIO in the commit thread), then we still need to
351 * take the FS itself readonly cleanly.
353 if (is_journal_aborted(journal)) {
354 ext4_abort(sb, "Detected aborted journal");
355 return ERR_PTR(-EROFS);
357 return jbd2_journal_start(journal, nblocks);
361 * The only special thing we need to do here is to make sure that all
362 * jbd2_journal_stop calls result in the superblock being marked dirty, so
363 * that sync() will call the filesystem's write_super callback if
366 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
368 struct super_block *sb;
372 if (!ext4_handle_valid(handle)) {
373 ext4_put_nojournal(handle);
376 sb = handle->h_transaction->t_journal->j_private;
378 rc = jbd2_journal_stop(handle);
383 __ext4_std_error(sb, where, line, err);
387 void ext4_journal_abort_handle(const char *caller, unsigned int line,
388 const char *err_fn, struct buffer_head *bh,
389 handle_t *handle, int err)
392 const char *errstr = ext4_decode_error(NULL, err, nbuf);
394 BUG_ON(!ext4_handle_valid(handle));
397 BUFFER_TRACE(bh, "abort");
402 if (is_handle_aborted(handle))
405 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
406 caller, line, errstr, err_fn);
408 jbd2_journal_abort_handle(handle);
411 static void __save_error_info(struct super_block *sb, const char *func,
414 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
416 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
417 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
418 es->s_last_error_time = cpu_to_le32(get_seconds());
419 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
420 es->s_last_error_line = cpu_to_le32(line);
421 if (!es->s_first_error_time) {
422 es->s_first_error_time = es->s_last_error_time;
423 strncpy(es->s_first_error_func, func,
424 sizeof(es->s_first_error_func));
425 es->s_first_error_line = cpu_to_le32(line);
426 es->s_first_error_ino = es->s_last_error_ino;
427 es->s_first_error_block = es->s_last_error_block;
430 * Start the daily error reporting function if it hasn't been
433 if (!es->s_error_count)
434 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
435 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
438 static void save_error_info(struct super_block *sb, const char *func,
441 __save_error_info(sb, func, line);
442 ext4_commit_super(sb, 1);
446 * The del_gendisk() function uninitializes the disk-specific data
447 * structures, including the bdi structure, without telling anyone
448 * else. Once this happens, any attempt to call mark_buffer_dirty()
449 * (for example, by ext4_commit_super), will cause a kernel OOPS.
450 * This is a kludge to prevent these oops until we can put in a proper
451 * hook in del_gendisk() to inform the VFS and file system layers.
453 static int block_device_ejected(struct super_block *sb)
455 struct inode *bd_inode = sb->s_bdev->bd_inode;
456 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
458 return bdi->dev == NULL;
461 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
463 struct super_block *sb = journal->j_private;
464 struct ext4_sb_info *sbi = EXT4_SB(sb);
465 int error = is_journal_aborted(journal);
466 struct ext4_journal_cb_entry *jce, *tmp;
468 spin_lock(&sbi->s_md_lock);
469 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
470 list_del_init(&jce->jce_list);
471 spin_unlock(&sbi->s_md_lock);
472 jce->jce_func(sb, jce, error);
473 spin_lock(&sbi->s_md_lock);
475 spin_unlock(&sbi->s_md_lock);
478 /* Deal with the reporting of failure conditions on a filesystem such as
479 * inconsistencies detected or read IO failures.
481 * On ext2, we can store the error state of the filesystem in the
482 * superblock. That is not possible on ext4, because we may have other
483 * write ordering constraints on the superblock which prevent us from
484 * writing it out straight away; and given that the journal is about to
485 * be aborted, we can't rely on the current, or future, transactions to
486 * write out the superblock safely.
488 * We'll just use the jbd2_journal_abort() error code to record an error in
489 * the journal instead. On recovery, the journal will complain about
490 * that error until we've noted it down and cleared it.
493 static void ext4_handle_error(struct super_block *sb)
495 if (sb->s_flags & MS_RDONLY)
498 if (!test_opt(sb, ERRORS_CONT)) {
499 journal_t *journal = EXT4_SB(sb)->s_journal;
501 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
503 jbd2_journal_abort(journal, -EIO);
505 if (test_opt(sb, ERRORS_RO)) {
506 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
507 sb->s_flags |= MS_RDONLY;
509 if (test_opt(sb, ERRORS_PANIC))
510 panic("EXT4-fs (device %s): panic forced after error\n",
514 void __ext4_error(struct super_block *sb, const char *function,
515 unsigned int line, const char *fmt, ...)
517 struct va_format vaf;
523 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
524 sb->s_id, function, line, current->comm, &vaf);
526 save_error_info(sb, function, line);
528 ext4_handle_error(sb);
531 void ext4_error_inode(struct inode *inode, const char *function,
532 unsigned int line, ext4_fsblk_t block,
533 const char *fmt, ...)
536 struct va_format vaf;
537 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
539 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
540 es->s_last_error_block = cpu_to_le64(block);
541 save_error_info(inode->i_sb, function, line);
546 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
547 "inode #%lu: block %llu: comm %s: %pV\n",
548 inode->i_sb->s_id, function, line, inode->i_ino,
549 block, current->comm, &vaf);
551 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
552 "inode #%lu: comm %s: %pV\n",
553 inode->i_sb->s_id, function, line, inode->i_ino,
554 current->comm, &vaf);
557 ext4_handle_error(inode->i_sb);
560 void ext4_error_file(struct file *file, const char *function,
561 unsigned int line, ext4_fsblk_t block,
562 const char *fmt, ...)
565 struct va_format vaf;
566 struct ext4_super_block *es;
567 struct inode *inode = file->f_dentry->d_inode;
568 char pathname[80], *path;
570 es = EXT4_SB(inode->i_sb)->s_es;
571 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
572 save_error_info(inode->i_sb, function, line);
573 path = d_path(&(file->f_path), pathname, sizeof(pathname));
581 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
582 "block %llu: comm %s: path %s: %pV\n",
583 inode->i_sb->s_id, function, line, inode->i_ino,
584 block, current->comm, path, &vaf);
587 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
588 "comm %s: path %s: %pV\n",
589 inode->i_sb->s_id, function, line, inode->i_ino,
590 current->comm, path, &vaf);
593 ext4_handle_error(inode->i_sb);
596 static const char *ext4_decode_error(struct super_block *sb, int errno,
603 errstr = "IO failure";
606 errstr = "Out of memory";
609 if (!sb || (EXT4_SB(sb)->s_journal &&
610 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
611 errstr = "Journal has aborted";
613 errstr = "Readonly filesystem";
616 /* If the caller passed in an extra buffer for unknown
617 * errors, textualise them now. Else we just return
620 /* Check for truncated error codes... */
621 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
630 /* __ext4_std_error decodes expected errors from journaling functions
631 * automatically and invokes the appropriate error response. */
633 void __ext4_std_error(struct super_block *sb, const char *function,
634 unsigned int line, int errno)
639 /* Special case: if the error is EROFS, and we're not already
640 * inside a transaction, then there's really no point in logging
642 if (errno == -EROFS && journal_current_handle() == NULL &&
643 (sb->s_flags & MS_RDONLY))
646 errstr = ext4_decode_error(sb, errno, nbuf);
647 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
648 sb->s_id, function, line, errstr);
649 save_error_info(sb, function, line);
651 ext4_handle_error(sb);
655 * ext4_abort is a much stronger failure handler than ext4_error. The
656 * abort function may be used to deal with unrecoverable failures such
657 * as journal IO errors or ENOMEM at a critical moment in log management.
659 * We unconditionally force the filesystem into an ABORT|READONLY state,
660 * unless the error response on the fs has been set to panic in which
661 * case we take the easy way out and panic immediately.
664 void __ext4_abort(struct super_block *sb, const char *function,
665 unsigned int line, const char *fmt, ...)
669 save_error_info(sb, function, line);
671 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
677 if ((sb->s_flags & MS_RDONLY) == 0) {
678 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
679 sb->s_flags |= MS_RDONLY;
680 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
681 if (EXT4_SB(sb)->s_journal)
682 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
683 save_error_info(sb, function, line);
685 if (test_opt(sb, ERRORS_PANIC))
686 panic("EXT4-fs panic from previous error\n");
689 void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
691 struct va_format vaf;
697 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
701 void __ext4_warning(struct super_block *sb, const char *function,
702 unsigned int line, const char *fmt, ...)
704 struct va_format vaf;
710 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
711 sb->s_id, function, line, &vaf);
715 void __ext4_grp_locked_error(const char *function, unsigned int line,
716 struct super_block *sb, ext4_group_t grp,
717 unsigned long ino, ext4_fsblk_t block,
718 const char *fmt, ...)
722 struct va_format vaf;
724 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
726 es->s_last_error_ino = cpu_to_le32(ino);
727 es->s_last_error_block = cpu_to_le64(block);
728 __save_error_info(sb, function, line);
734 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
735 sb->s_id, function, line, grp);
737 printk(KERN_CONT "inode %lu: ", ino);
739 printk(KERN_CONT "block %llu:", (unsigned long long) block);
740 printk(KERN_CONT "%pV\n", &vaf);
743 if (test_opt(sb, ERRORS_CONT)) {
744 ext4_commit_super(sb, 0);
748 ext4_unlock_group(sb, grp);
749 ext4_handle_error(sb);
751 * We only get here in the ERRORS_RO case; relocking the group
752 * may be dangerous, but nothing bad will happen since the
753 * filesystem will have already been marked read/only and the
754 * journal has been aborted. We return 1 as a hint to callers
755 * who might what to use the return value from
756 * ext4_grp_locked_error() to distinguish between the
757 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
758 * aggressively from the ext4 function in question, with a
759 * more appropriate error code.
761 ext4_lock_group(sb, grp);
765 void ext4_update_dynamic_rev(struct super_block *sb)
767 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
769 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
773 "updating to rev %d because of new feature flag, "
774 "running e2fsck is recommended",
777 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
778 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
779 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
780 /* leave es->s_feature_*compat flags alone */
781 /* es->s_uuid will be set by e2fsck if empty */
784 * The rest of the superblock fields should be zero, and if not it
785 * means they are likely already in use, so leave them alone. We
786 * can leave it up to e2fsck to clean up any inconsistencies there.
791 * Open the external journal device
793 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
795 struct block_device *bdev;
796 char b[BDEVNAME_SIZE];
798 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
804 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
805 __bdevname(dev, b), PTR_ERR(bdev));
810 * Release the journal device
812 static int ext4_blkdev_put(struct block_device *bdev)
814 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
817 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
819 struct block_device *bdev;
822 bdev = sbi->journal_bdev;
824 ret = ext4_blkdev_put(bdev);
825 sbi->journal_bdev = NULL;
830 static inline struct inode *orphan_list_entry(struct list_head *l)
832 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
835 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
839 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
840 le32_to_cpu(sbi->s_es->s_last_orphan));
842 printk(KERN_ERR "sb_info orphan list:\n");
843 list_for_each(l, &sbi->s_orphan) {
844 struct inode *inode = orphan_list_entry(l);
846 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
847 inode->i_sb->s_id, inode->i_ino, inode,
848 inode->i_mode, inode->i_nlink,
853 static void ext4_put_super(struct super_block *sb)
855 struct ext4_sb_info *sbi = EXT4_SB(sb);
856 struct ext4_super_block *es = sbi->s_es;
859 ext4_unregister_li_request(sb);
860 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
862 flush_workqueue(sbi->dio_unwritten_wq);
863 destroy_workqueue(sbi->dio_unwritten_wq);
866 if (sbi->s_journal) {
867 err = jbd2_journal_destroy(sbi->s_journal);
868 sbi->s_journal = NULL;
870 ext4_abort(sb, "Couldn't clean up the journal");
873 del_timer(&sbi->s_err_report);
874 ext4_release_system_zone(sb);
876 ext4_ext_release(sb);
877 ext4_xattr_put_super(sb);
879 if (!(sb->s_flags & MS_RDONLY)) {
880 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
881 es->s_state = cpu_to_le16(sbi->s_mount_state);
883 if (sb->s_dirt || !(sb->s_flags & MS_RDONLY))
884 ext4_commit_super(sb, 1);
887 remove_proc_entry("options", sbi->s_proc);
888 remove_proc_entry(sb->s_id, ext4_proc_root);
890 kobject_del(&sbi->s_kobj);
892 for (i = 0; i < sbi->s_gdb_count; i++)
893 brelse(sbi->s_group_desc[i]);
894 ext4_kvfree(sbi->s_group_desc);
895 ext4_kvfree(sbi->s_flex_groups);
896 percpu_counter_destroy(&sbi->s_freeclusters_counter);
897 percpu_counter_destroy(&sbi->s_freeinodes_counter);
898 percpu_counter_destroy(&sbi->s_dirs_counter);
899 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
902 for (i = 0; i < MAXQUOTAS; i++)
903 kfree(sbi->s_qf_names[i]);
906 /* Debugging code just in case the in-memory inode orphan list
907 * isn't empty. The on-disk one can be non-empty if we've
908 * detected an error and taken the fs readonly, but the
909 * in-memory list had better be clean by this point. */
910 if (!list_empty(&sbi->s_orphan))
911 dump_orphan_list(sb, sbi);
912 J_ASSERT(list_empty(&sbi->s_orphan));
914 invalidate_bdev(sb->s_bdev);
915 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
917 * Invalidate the journal device's buffers. We don't want them
918 * floating about in memory - the physical journal device may
919 * hotswapped, and it breaks the `ro-after' testing code.
921 sync_blockdev(sbi->journal_bdev);
922 invalidate_bdev(sbi->journal_bdev);
923 ext4_blkdev_remove(sbi);
926 kthread_stop(sbi->s_mmp_tsk);
927 sb->s_fs_info = NULL;
929 * Now that we are completely done shutting down the
930 * superblock, we need to actually destroy the kobject.
933 kobject_put(&sbi->s_kobj);
934 wait_for_completion(&sbi->s_kobj_unregister);
935 if (sbi->s_chksum_driver)
936 crypto_free_shash(sbi->s_chksum_driver);
937 kfree(sbi->s_blockgroup_lock);
941 static struct kmem_cache *ext4_inode_cachep;
944 * Called inside transaction, so use GFP_NOFS
946 static struct inode *ext4_alloc_inode(struct super_block *sb)
948 struct ext4_inode_info *ei;
950 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
954 ei->vfs_inode.i_version = 1;
955 ei->vfs_inode.i_data.writeback_index = 0;
956 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
957 INIT_LIST_HEAD(&ei->i_prealloc_list);
958 spin_lock_init(&ei->i_prealloc_lock);
959 ei->i_reserved_data_blocks = 0;
960 ei->i_reserved_meta_blocks = 0;
961 ei->i_allocated_meta_blocks = 0;
962 ei->i_da_metadata_calc_len = 0;
963 spin_lock_init(&(ei->i_block_reservation_lock));
965 ei->i_reserved_quota = 0;
968 INIT_LIST_HEAD(&ei->i_completed_io_list);
969 spin_lock_init(&ei->i_completed_io_lock);
970 ei->cur_aio_dio = NULL;
972 ei->i_datasync_tid = 0;
973 atomic_set(&ei->i_ioend_count, 0);
974 atomic_set(&ei->i_aiodio_unwritten, 0);
976 return &ei->vfs_inode;
979 static int ext4_drop_inode(struct inode *inode)
981 int drop = generic_drop_inode(inode);
983 trace_ext4_drop_inode(inode, drop);
987 static void ext4_i_callback(struct rcu_head *head)
989 struct inode *inode = container_of(head, struct inode, i_rcu);
990 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
993 static void ext4_destroy_inode(struct inode *inode)
995 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
996 ext4_msg(inode->i_sb, KERN_ERR,
997 "Inode %lu (%p): orphan list check failed!",
998 inode->i_ino, EXT4_I(inode));
999 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1000 EXT4_I(inode), sizeof(struct ext4_inode_info),
1004 call_rcu(&inode->i_rcu, ext4_i_callback);
1007 static void init_once(void *foo)
1009 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
1011 INIT_LIST_HEAD(&ei->i_orphan);
1012 #ifdef CONFIG_EXT4_FS_XATTR
1013 init_rwsem(&ei->xattr_sem);
1015 init_rwsem(&ei->i_data_sem);
1016 inode_init_once(&ei->vfs_inode);
1019 static int init_inodecache(void)
1021 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1022 sizeof(struct ext4_inode_info),
1023 0, (SLAB_RECLAIM_ACCOUNT|
1026 if (ext4_inode_cachep == NULL)
1031 static void destroy_inodecache(void)
1033 kmem_cache_destroy(ext4_inode_cachep);
1036 void ext4_clear_inode(struct inode *inode)
1038 invalidate_inode_buffers(inode);
1041 ext4_discard_preallocations(inode);
1042 if (EXT4_I(inode)->jinode) {
1043 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1044 EXT4_I(inode)->jinode);
1045 jbd2_free_inode(EXT4_I(inode)->jinode);
1046 EXT4_I(inode)->jinode = NULL;
1050 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1051 u64 ino, u32 generation)
1053 struct inode *inode;
1055 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1056 return ERR_PTR(-ESTALE);
1057 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1058 return ERR_PTR(-ESTALE);
1060 /* iget isn't really right if the inode is currently unallocated!!
1062 * ext4_read_inode will return a bad_inode if the inode had been
1063 * deleted, so we should be safe.
1065 * Currently we don't know the generation for parent directory, so
1066 * a generation of 0 means "accept any"
1068 inode = ext4_iget(sb, ino);
1070 return ERR_CAST(inode);
1071 if (generation && inode->i_generation != generation) {
1073 return ERR_PTR(-ESTALE);
1079 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1080 int fh_len, int fh_type)
1082 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1083 ext4_nfs_get_inode);
1086 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1087 int fh_len, int fh_type)
1089 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1090 ext4_nfs_get_inode);
1094 * Try to release metadata pages (indirect blocks, directories) which are
1095 * mapped via the block device. Since these pages could have journal heads
1096 * which would prevent try_to_free_buffers() from freeing them, we must use
1097 * jbd2 layer's try_to_free_buffers() function to release them.
1099 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1102 journal_t *journal = EXT4_SB(sb)->s_journal;
1104 WARN_ON(PageChecked(page));
1105 if (!page_has_buffers(page))
1108 return jbd2_journal_try_to_free_buffers(journal, page,
1109 wait & ~__GFP_WAIT);
1110 return try_to_free_buffers(page);
1114 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1115 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1117 static int ext4_write_dquot(struct dquot *dquot);
1118 static int ext4_acquire_dquot(struct dquot *dquot);
1119 static int ext4_release_dquot(struct dquot *dquot);
1120 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1121 static int ext4_write_info(struct super_block *sb, int type);
1122 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1124 static int ext4_quota_off(struct super_block *sb, int type);
1125 static int ext4_quota_on_mount(struct super_block *sb, int type);
1126 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1127 size_t len, loff_t off);
1128 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1129 const char *data, size_t len, loff_t off);
1131 static const struct dquot_operations ext4_quota_operations = {
1132 .get_reserved_space = ext4_get_reserved_space,
1133 .write_dquot = ext4_write_dquot,
1134 .acquire_dquot = ext4_acquire_dquot,
1135 .release_dquot = ext4_release_dquot,
1136 .mark_dirty = ext4_mark_dquot_dirty,
1137 .write_info = ext4_write_info,
1138 .alloc_dquot = dquot_alloc,
1139 .destroy_dquot = dquot_destroy,
1142 static const struct quotactl_ops ext4_qctl_operations = {
1143 .quota_on = ext4_quota_on,
1144 .quota_off = ext4_quota_off,
1145 .quota_sync = dquot_quota_sync,
1146 .get_info = dquot_get_dqinfo,
1147 .set_info = dquot_set_dqinfo,
1148 .get_dqblk = dquot_get_dqblk,
1149 .set_dqblk = dquot_set_dqblk
1153 static const struct super_operations ext4_sops = {
1154 .alloc_inode = ext4_alloc_inode,
1155 .destroy_inode = ext4_destroy_inode,
1156 .write_inode = ext4_write_inode,
1157 .dirty_inode = ext4_dirty_inode,
1158 .drop_inode = ext4_drop_inode,
1159 .evict_inode = ext4_evict_inode,
1160 .put_super = ext4_put_super,
1161 .sync_fs = ext4_sync_fs,
1162 .freeze_fs = ext4_freeze,
1163 .unfreeze_fs = ext4_unfreeze,
1164 .statfs = ext4_statfs,
1165 .remount_fs = ext4_remount,
1166 .show_options = ext4_show_options,
1168 .quota_read = ext4_quota_read,
1169 .quota_write = ext4_quota_write,
1171 .bdev_try_to_free_page = bdev_try_to_free_page,
1174 static const struct super_operations ext4_nojournal_sops = {
1175 .alloc_inode = ext4_alloc_inode,
1176 .destroy_inode = ext4_destroy_inode,
1177 .write_inode = ext4_write_inode,
1178 .dirty_inode = ext4_dirty_inode,
1179 .drop_inode = ext4_drop_inode,
1180 .evict_inode = ext4_evict_inode,
1181 .write_super = ext4_write_super,
1182 .put_super = ext4_put_super,
1183 .statfs = ext4_statfs,
1184 .remount_fs = ext4_remount,
1185 .show_options = ext4_show_options,
1187 .quota_read = ext4_quota_read,
1188 .quota_write = ext4_quota_write,
1190 .bdev_try_to_free_page = bdev_try_to_free_page,
1193 static const struct export_operations ext4_export_ops = {
1194 .fh_to_dentry = ext4_fh_to_dentry,
1195 .fh_to_parent = ext4_fh_to_parent,
1196 .get_parent = ext4_get_parent,
1200 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1201 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1202 Opt_nouid32, Opt_debug, Opt_removed,
1203 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1204 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1205 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1206 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
1207 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1208 Opt_data_err_abort, Opt_data_err_ignore,
1209 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1210 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1211 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1212 Opt_usrquota, Opt_grpquota, Opt_i_version,
1213 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1214 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1215 Opt_inode_readahead_blks, Opt_journal_ioprio,
1216 Opt_dioread_nolock, Opt_dioread_lock,
1217 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1220 static const match_table_t tokens = {
1221 {Opt_bsd_df, "bsddf"},
1222 {Opt_minix_df, "minixdf"},
1223 {Opt_grpid, "grpid"},
1224 {Opt_grpid, "bsdgroups"},
1225 {Opt_nogrpid, "nogrpid"},
1226 {Opt_nogrpid, "sysvgroups"},
1227 {Opt_resgid, "resgid=%u"},
1228 {Opt_resuid, "resuid=%u"},
1230 {Opt_err_cont, "errors=continue"},
1231 {Opt_err_panic, "errors=panic"},
1232 {Opt_err_ro, "errors=remount-ro"},
1233 {Opt_nouid32, "nouid32"},
1234 {Opt_debug, "debug"},
1235 {Opt_removed, "oldalloc"},
1236 {Opt_removed, "orlov"},
1237 {Opt_user_xattr, "user_xattr"},
1238 {Opt_nouser_xattr, "nouser_xattr"},
1240 {Opt_noacl, "noacl"},
1241 {Opt_noload, "norecovery"},
1242 {Opt_noload, "noload"},
1243 {Opt_removed, "nobh"},
1244 {Opt_removed, "bh"},
1245 {Opt_commit, "commit=%u"},
1246 {Opt_min_batch_time, "min_batch_time=%u"},
1247 {Opt_max_batch_time, "max_batch_time=%u"},
1248 {Opt_journal_dev, "journal_dev=%u"},
1249 {Opt_journal_checksum, "journal_checksum"},
1250 {Opt_journal_async_commit, "journal_async_commit"},
1251 {Opt_abort, "abort"},
1252 {Opt_data_journal, "data=journal"},
1253 {Opt_data_ordered, "data=ordered"},
1254 {Opt_data_writeback, "data=writeback"},
1255 {Opt_data_err_abort, "data_err=abort"},
1256 {Opt_data_err_ignore, "data_err=ignore"},
1257 {Opt_offusrjquota, "usrjquota="},
1258 {Opt_usrjquota, "usrjquota=%s"},
1259 {Opt_offgrpjquota, "grpjquota="},
1260 {Opt_grpjquota, "grpjquota=%s"},
1261 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1262 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1263 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1264 {Opt_grpquota, "grpquota"},
1265 {Opt_noquota, "noquota"},
1266 {Opt_quota, "quota"},
1267 {Opt_usrquota, "usrquota"},
1268 {Opt_barrier, "barrier=%u"},
1269 {Opt_barrier, "barrier"},
1270 {Opt_nobarrier, "nobarrier"},
1271 {Opt_i_version, "i_version"},
1272 {Opt_stripe, "stripe=%u"},
1273 {Opt_delalloc, "delalloc"},
1274 {Opt_nodelalloc, "nodelalloc"},
1275 {Opt_mblk_io_submit, "mblk_io_submit"},
1276 {Opt_nomblk_io_submit, "nomblk_io_submit"},
1277 {Opt_block_validity, "block_validity"},
1278 {Opt_noblock_validity, "noblock_validity"},
1279 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1280 {Opt_journal_ioprio, "journal_ioprio=%u"},
1281 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1282 {Opt_auto_da_alloc, "auto_da_alloc"},
1283 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1284 {Opt_dioread_nolock, "dioread_nolock"},
1285 {Opt_dioread_lock, "dioread_lock"},
1286 {Opt_discard, "discard"},
1287 {Opt_nodiscard, "nodiscard"},
1288 {Opt_init_itable, "init_itable=%u"},
1289 {Opt_init_itable, "init_itable"},
1290 {Opt_noinit_itable, "noinit_itable"},
1291 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1292 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1293 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1294 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1295 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
1299 static ext4_fsblk_t get_sb_block(void **data)
1301 ext4_fsblk_t sb_block;
1302 char *options = (char *) *data;
1304 if (!options || strncmp(options, "sb=", 3) != 0)
1305 return 1; /* Default location */
1308 /* TODO: use simple_strtoll with >32bit ext4 */
1309 sb_block = simple_strtoul(options, &options, 0);
1310 if (*options && *options != ',') {
1311 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1315 if (*options == ',')
1317 *data = (void *) options;
1322 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1323 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1324 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1327 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1329 struct ext4_sb_info *sbi = EXT4_SB(sb);
1332 if (sb_any_quota_loaded(sb) &&
1333 !sbi->s_qf_names[qtype]) {
1334 ext4_msg(sb, KERN_ERR,
1335 "Cannot change journaled "
1336 "quota options when quota turned on");
1339 qname = match_strdup(args);
1341 ext4_msg(sb, KERN_ERR,
1342 "Not enough memory for storing quotafile name");
1345 if (sbi->s_qf_names[qtype] &&
1346 strcmp(sbi->s_qf_names[qtype], qname)) {
1347 ext4_msg(sb, KERN_ERR,
1348 "%s quota file already specified", QTYPE2NAME(qtype));
1352 sbi->s_qf_names[qtype] = qname;
1353 if (strchr(sbi->s_qf_names[qtype], '/')) {
1354 ext4_msg(sb, KERN_ERR,
1355 "quotafile must be on filesystem root");
1356 kfree(sbi->s_qf_names[qtype]);
1357 sbi->s_qf_names[qtype] = NULL;
1364 static int clear_qf_name(struct super_block *sb, int qtype)
1367 struct ext4_sb_info *sbi = EXT4_SB(sb);
1369 if (sb_any_quota_loaded(sb) &&
1370 sbi->s_qf_names[qtype]) {
1371 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1372 " when quota turned on");
1376 * The space will be released later when all options are confirmed
1379 sbi->s_qf_names[qtype] = NULL;
1384 #define MOPT_SET 0x0001
1385 #define MOPT_CLEAR 0x0002
1386 #define MOPT_NOSUPPORT 0x0004
1387 #define MOPT_EXPLICIT 0x0008
1388 #define MOPT_CLEAR_ERR 0x0010
1389 #define MOPT_GTE0 0x0020
1392 #define MOPT_QFMT 0x0040
1394 #define MOPT_Q MOPT_NOSUPPORT
1395 #define MOPT_QFMT MOPT_NOSUPPORT
1397 #define MOPT_DATAJ 0x0080
1399 static const struct mount_opts {
1403 } ext4_mount_opts[] = {
1404 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1405 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1406 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1407 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1408 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1409 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1410 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1411 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1412 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1413 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1414 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1415 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1416 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1417 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1418 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1419 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1420 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1421 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1422 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1423 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1424 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1425 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1426 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1427 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1428 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1429 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1430 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1431 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1432 {Opt_commit, 0, MOPT_GTE0},
1433 {Opt_max_batch_time, 0, MOPT_GTE0},
1434 {Opt_min_batch_time, 0, MOPT_GTE0},
1435 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1436 {Opt_init_itable, 0, MOPT_GTE0},
1437 {Opt_stripe, 0, MOPT_GTE0},
1438 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1439 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1440 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
1441 #ifdef CONFIG_EXT4_FS_XATTR
1442 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1443 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1445 {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1446 {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
1448 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1449 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1450 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1452 {Opt_acl, 0, MOPT_NOSUPPORT},
1453 {Opt_noacl, 0, MOPT_NOSUPPORT},
1455 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1456 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1457 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1458 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1460 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1462 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1463 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1464 {Opt_usrjquota, 0, MOPT_Q},
1465 {Opt_grpjquota, 0, MOPT_Q},
1466 {Opt_offusrjquota, 0, MOPT_Q},
1467 {Opt_offgrpjquota, 0, MOPT_Q},
1468 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1469 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1470 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1474 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1475 substring_t *args, unsigned long *journal_devnum,
1476 unsigned int *journal_ioprio, int is_remount)
1478 struct ext4_sb_info *sbi = EXT4_SB(sb);
1479 const struct mount_opts *m;
1485 if (token == Opt_usrjquota)
1486 return set_qf_name(sb, USRQUOTA, &args[0]);
1487 else if (token == Opt_grpjquota)
1488 return set_qf_name(sb, GRPQUOTA, &args[0]);
1489 else if (token == Opt_offusrjquota)
1490 return clear_qf_name(sb, USRQUOTA);
1491 else if (token == Opt_offgrpjquota)
1492 return clear_qf_name(sb, GRPQUOTA);
1494 if (args->from && match_int(args, &arg))
1498 case Opt_nouser_xattr:
1499 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1502 return 1; /* handled by get_sb_block() */
1504 ext4_msg(sb, KERN_WARNING,
1505 "Ignoring removed %s option", opt);
1508 uid = make_kuid(current_user_ns(), arg);
1509 if (!uid_valid(uid)) {
1510 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1513 sbi->s_resuid = uid;
1516 gid = make_kgid(current_user_ns(), arg);
1517 if (!gid_valid(gid)) {
1518 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1521 sbi->s_resgid = gid;
1524 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1527 sb->s_flags |= MS_I_VERSION;
1529 case Opt_journal_dev:
1531 ext4_msg(sb, KERN_ERR,
1532 "Cannot specify journal on remount");
1535 *journal_devnum = arg;
1537 case Opt_journal_ioprio:
1538 if (arg < 0 || arg > 7)
1540 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1544 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1545 if (token != m->token)
1547 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1549 if (m->flags & MOPT_EXPLICIT)
1550 set_opt2(sb, EXPLICIT_DELALLOC);
1551 if (m->flags & MOPT_CLEAR_ERR)
1552 clear_opt(sb, ERRORS_MASK);
1553 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1554 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1555 "options when quota turned on");
1559 if (m->flags & MOPT_NOSUPPORT) {
1560 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1561 } else if (token == Opt_commit) {
1563 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1564 sbi->s_commit_interval = HZ * arg;
1565 } else if (token == Opt_max_batch_time) {
1567 arg = EXT4_DEF_MAX_BATCH_TIME;
1568 sbi->s_max_batch_time = arg;
1569 } else if (token == Opt_min_batch_time) {
1570 sbi->s_min_batch_time = arg;
1571 } else if (token == Opt_inode_readahead_blks) {
1572 if (arg > (1 << 30))
1574 if (arg && !is_power_of_2(arg)) {
1575 ext4_msg(sb, KERN_ERR,
1576 "EXT4-fs: inode_readahead_blks"
1577 " must be a power of 2");
1580 sbi->s_inode_readahead_blks = arg;
1581 } else if (token == Opt_init_itable) {
1582 set_opt(sb, INIT_INODE_TABLE);
1584 arg = EXT4_DEF_LI_WAIT_MULT;
1585 sbi->s_li_wait_mult = arg;
1586 } else if (token == Opt_stripe) {
1587 sbi->s_stripe = arg;
1588 } else if (m->flags & MOPT_DATAJ) {
1590 if (!sbi->s_journal)
1591 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1592 else if (test_opt(sb, DATA_FLAGS) !=
1594 ext4_msg(sb, KERN_ERR,
1595 "Cannot change data mode on remount");
1599 clear_opt(sb, DATA_FLAGS);
1600 sbi->s_mount_opt |= m->mount_opt;
1603 } else if (m->flags & MOPT_QFMT) {
1604 if (sb_any_quota_loaded(sb) &&
1605 sbi->s_jquota_fmt != m->mount_opt) {
1606 ext4_msg(sb, KERN_ERR, "Cannot "
1607 "change journaled quota options "
1608 "when quota turned on");
1611 sbi->s_jquota_fmt = m->mount_opt;
1616 if (m->flags & MOPT_CLEAR)
1618 else if (unlikely(!(m->flags & MOPT_SET))) {
1619 ext4_msg(sb, KERN_WARNING,
1620 "buggy handling of option %s", opt);
1625 sbi->s_mount_opt |= m->mount_opt;
1627 sbi->s_mount_opt &= ~m->mount_opt;
1631 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1632 "or missing value", opt);
1636 static int parse_options(char *options, struct super_block *sb,
1637 unsigned long *journal_devnum,
1638 unsigned int *journal_ioprio,
1642 struct ext4_sb_info *sbi = EXT4_SB(sb);
1645 substring_t args[MAX_OPT_ARGS];
1651 while ((p = strsep(&options, ",")) != NULL) {
1655 * Initialize args struct so we know whether arg was
1656 * found; some options take optional arguments.
1658 args[0].to = args[0].from = 0;
1659 token = match_token(p, tokens, args);
1660 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1661 journal_ioprio, is_remount) < 0)
1665 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1666 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1667 clear_opt(sb, USRQUOTA);
1669 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1670 clear_opt(sb, GRPQUOTA);
1672 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1673 ext4_msg(sb, KERN_ERR, "old and new quota "
1678 if (!sbi->s_jquota_fmt) {
1679 ext4_msg(sb, KERN_ERR, "journaled quota format "
1684 if (sbi->s_jquota_fmt) {
1685 ext4_msg(sb, KERN_ERR, "journaled quota format "
1686 "specified with no journaling "
1695 static inline void ext4_show_quota_options(struct seq_file *seq,
1696 struct super_block *sb)
1698 #if defined(CONFIG_QUOTA)
1699 struct ext4_sb_info *sbi = EXT4_SB(sb);
1701 if (sbi->s_jquota_fmt) {
1704 switch (sbi->s_jquota_fmt) {
1715 seq_printf(seq, ",jqfmt=%s", fmtname);
1718 if (sbi->s_qf_names[USRQUOTA])
1719 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1721 if (sbi->s_qf_names[GRPQUOTA])
1722 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1724 if (test_opt(sb, USRQUOTA))
1725 seq_puts(seq, ",usrquota");
1727 if (test_opt(sb, GRPQUOTA))
1728 seq_puts(seq, ",grpquota");
1732 static const char *token2str(int token)
1734 static const struct match_token *t;
1736 for (t = tokens; t->token != Opt_err; t++)
1737 if (t->token == token && !strchr(t->pattern, '='))
1744 * - it's set to a non-default value OR
1745 * - if the per-sb default is different from the global default
1747 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1750 struct ext4_sb_info *sbi = EXT4_SB(sb);
1751 struct ext4_super_block *es = sbi->s_es;
1752 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1753 const struct mount_opts *m;
1754 char sep = nodefs ? '\n' : ',';
1756 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1757 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1759 if (sbi->s_sb_block != 1)
1760 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1762 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1763 int want_set = m->flags & MOPT_SET;
1764 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1765 (m->flags & MOPT_CLEAR_ERR))
1767 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1768 continue; /* skip if same as the default */
1770 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1771 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1772 continue; /* select Opt_noFoo vs Opt_Foo */
1773 SEQ_OPTS_PRINT("%s", token2str(m->token));
1776 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1777 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1778 SEQ_OPTS_PRINT("resuid=%u",
1779 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1780 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
1781 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1782 SEQ_OPTS_PRINT("resgid=%u",
1783 from_kgid_munged(&init_user_ns, sbi->s_resgid));
1784 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1785 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1786 SEQ_OPTS_PUTS("errors=remount-ro");
1787 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1788 SEQ_OPTS_PUTS("errors=continue");
1789 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1790 SEQ_OPTS_PUTS("errors=panic");
1791 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1792 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1793 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1794 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1795 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1796 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1797 if (sb->s_flags & MS_I_VERSION)
1798 SEQ_OPTS_PUTS("i_version");
1799 if (nodefs || sbi->s_stripe)
1800 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1801 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1802 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1803 SEQ_OPTS_PUTS("data=journal");
1804 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1805 SEQ_OPTS_PUTS("data=ordered");
1806 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1807 SEQ_OPTS_PUTS("data=writeback");
1810 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1811 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1812 sbi->s_inode_readahead_blks);
1814 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1815 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1816 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1818 ext4_show_quota_options(seq, sb);
1822 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1824 return _ext4_show_options(seq, root->d_sb, 0);
1827 static int options_seq_show(struct seq_file *seq, void *offset)
1829 struct super_block *sb = seq->private;
1832 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1833 rc = _ext4_show_options(seq, sb, 1);
1834 seq_puts(seq, "\n");
1838 static int options_open_fs(struct inode *inode, struct file *file)
1840 return single_open(file, options_seq_show, PDE(inode)->data);
1843 static const struct file_operations ext4_seq_options_fops = {
1844 .owner = THIS_MODULE,
1845 .open = options_open_fs,
1847 .llseek = seq_lseek,
1848 .release = single_release,
1851 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1854 struct ext4_sb_info *sbi = EXT4_SB(sb);
1857 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1858 ext4_msg(sb, KERN_ERR, "revision level too high, "
1859 "forcing read-only mode");
1864 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1865 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1866 "running e2fsck is recommended");
1867 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1868 ext4_msg(sb, KERN_WARNING,
1869 "warning: mounting fs with errors, "
1870 "running e2fsck is recommended");
1871 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1872 le16_to_cpu(es->s_mnt_count) >=
1873 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1874 ext4_msg(sb, KERN_WARNING,
1875 "warning: maximal mount count reached, "
1876 "running e2fsck is recommended");
1877 else if (le32_to_cpu(es->s_checkinterval) &&
1878 (le32_to_cpu(es->s_lastcheck) +
1879 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1880 ext4_msg(sb, KERN_WARNING,
1881 "warning: checktime reached, "
1882 "running e2fsck is recommended");
1883 if (!sbi->s_journal)
1884 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1885 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1886 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1887 le16_add_cpu(&es->s_mnt_count, 1);
1888 es->s_mtime = cpu_to_le32(get_seconds());
1889 ext4_update_dynamic_rev(sb);
1891 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1893 ext4_commit_super(sb, 1);
1895 if (test_opt(sb, DEBUG))
1896 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1897 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1899 sbi->s_groups_count,
1900 EXT4_BLOCKS_PER_GROUP(sb),
1901 EXT4_INODES_PER_GROUP(sb),
1902 sbi->s_mount_opt, sbi->s_mount_opt2);
1904 cleancache_init_fs(sb);
1908 static int ext4_fill_flex_info(struct super_block *sb)
1910 struct ext4_sb_info *sbi = EXT4_SB(sb);
1911 struct ext4_group_desc *gdp = NULL;
1912 ext4_group_t flex_group_count;
1913 ext4_group_t flex_group;
1914 unsigned int groups_per_flex = 0;
1918 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1919 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1920 sbi->s_log_groups_per_flex = 0;
1923 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1925 /* We allocate both existing and potentially added groups */
1926 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1927 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1928 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1929 size = flex_group_count * sizeof(struct flex_groups);
1930 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
1931 if (sbi->s_flex_groups == NULL) {
1932 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
1937 for (i = 0; i < sbi->s_groups_count; i++) {
1938 gdp = ext4_get_group_desc(sb, i, NULL);
1940 flex_group = ext4_flex_group(sbi, i);
1941 atomic_add(ext4_free_inodes_count(sb, gdp),
1942 &sbi->s_flex_groups[flex_group].free_inodes);
1943 atomic_add(ext4_free_group_clusters(sb, gdp),
1944 &sbi->s_flex_groups[flex_group].free_clusters);
1945 atomic_add(ext4_used_dirs_count(sb, gdp),
1946 &sbi->s_flex_groups[flex_group].used_dirs);
1954 static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1955 struct ext4_group_desc *gdp)
1959 __le32 le_group = cpu_to_le32(block_group);
1961 if ((sbi->s_es->s_feature_ro_compat &
1962 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
1963 /* Use new metadata_csum algorithm */
1967 old_csum = gdp->bg_checksum;
1968 gdp->bg_checksum = 0;
1969 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
1971 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
1973 gdp->bg_checksum = old_csum;
1975 crc = csum32 & 0xFFFF;
1979 /* old crc16 code */
1980 offset = offsetof(struct ext4_group_desc, bg_checksum);
1982 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1983 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1984 crc = crc16(crc, (__u8 *)gdp, offset);
1985 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1986 /* for checksum of struct ext4_group_desc do the rest...*/
1987 if ((sbi->s_es->s_feature_incompat &
1988 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1989 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1990 crc = crc16(crc, (__u8 *)gdp + offset,
1991 le16_to_cpu(sbi->s_es->s_desc_size) -
1995 return cpu_to_le16(crc);
1998 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
1999 struct ext4_group_desc *gdp)
2001 if (ext4_has_group_desc_csum(sb) &&
2002 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2009 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2010 struct ext4_group_desc *gdp)
2012 if (!ext4_has_group_desc_csum(sb))
2014 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2017 /* Called at mount-time, super-block is locked */
2018 static int ext4_check_descriptors(struct super_block *sb,
2019 ext4_group_t *first_not_zeroed)
2021 struct ext4_sb_info *sbi = EXT4_SB(sb);
2022 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2023 ext4_fsblk_t last_block;
2024 ext4_fsblk_t block_bitmap;
2025 ext4_fsblk_t inode_bitmap;
2026 ext4_fsblk_t inode_table;
2027 int flexbg_flag = 0;
2028 ext4_group_t i, grp = sbi->s_groups_count;
2030 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2033 ext4_debug("Checking group descriptors");
2035 for (i = 0; i < sbi->s_groups_count; i++) {
2036 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2038 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2039 last_block = ext4_blocks_count(sbi->s_es) - 1;
2041 last_block = first_block +
2042 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2044 if ((grp == sbi->s_groups_count) &&
2045 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2048 block_bitmap = ext4_block_bitmap(sb, gdp);
2049 if (block_bitmap < first_block || block_bitmap > last_block) {
2050 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2051 "Block bitmap for group %u not in group "
2052 "(block %llu)!", i, block_bitmap);
2055 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2056 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2057 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2058 "Inode bitmap for group %u not in group "
2059 "(block %llu)!", i, inode_bitmap);
2062 inode_table = ext4_inode_table(sb, gdp);
2063 if (inode_table < first_block ||
2064 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2065 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2066 "Inode table for group %u not in group "
2067 "(block %llu)!", i, inode_table);
2070 ext4_lock_group(sb, i);
2071 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2072 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2073 "Checksum for group %u failed (%u!=%u)",
2074 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2075 gdp)), le16_to_cpu(gdp->bg_checksum));
2076 if (!(sb->s_flags & MS_RDONLY)) {
2077 ext4_unlock_group(sb, i);
2081 ext4_unlock_group(sb, i);
2083 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2085 if (NULL != first_not_zeroed)
2086 *first_not_zeroed = grp;
2088 ext4_free_blocks_count_set(sbi->s_es,
2089 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2090 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2094 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2095 * the superblock) which were deleted from all directories, but held open by
2096 * a process at the time of a crash. We walk the list and try to delete these
2097 * inodes at recovery time (only with a read-write filesystem).
2099 * In order to keep the orphan inode chain consistent during traversal (in
2100 * case of crash during recovery), we link each inode into the superblock
2101 * orphan list_head and handle it the same way as an inode deletion during
2102 * normal operation (which journals the operations for us).
2104 * We only do an iget() and an iput() on each inode, which is very safe if we
2105 * accidentally point at an in-use or already deleted inode. The worst that
2106 * can happen in this case is that we get a "bit already cleared" message from
2107 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2108 * e2fsck was run on this filesystem, and it must have already done the orphan
2109 * inode cleanup for us, so we can safely abort without any further action.
2111 static void ext4_orphan_cleanup(struct super_block *sb,
2112 struct ext4_super_block *es)
2114 unsigned int s_flags = sb->s_flags;
2115 int nr_orphans = 0, nr_truncates = 0;
2119 if (!es->s_last_orphan) {
2120 jbd_debug(4, "no orphan inodes to clean up\n");
2124 if (bdev_read_only(sb->s_bdev)) {
2125 ext4_msg(sb, KERN_ERR, "write access "
2126 "unavailable, skipping orphan cleanup");
2130 /* Check if feature set would not allow a r/w mount */
2131 if (!ext4_feature_set_ok(sb, 0)) {
2132 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2133 "unknown ROCOMPAT features");
2137 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2138 if (es->s_last_orphan)
2139 jbd_debug(1, "Errors on filesystem, "
2140 "clearing orphan list.\n");
2141 es->s_last_orphan = 0;
2142 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2146 if (s_flags & MS_RDONLY) {
2147 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2148 sb->s_flags &= ~MS_RDONLY;
2151 /* Needed for iput() to work correctly and not trash data */
2152 sb->s_flags |= MS_ACTIVE;
2153 /* Turn on quotas so that they are updated correctly */
2154 for (i = 0; i < MAXQUOTAS; i++) {
2155 if (EXT4_SB(sb)->s_qf_names[i]) {
2156 int ret = ext4_quota_on_mount(sb, i);
2158 ext4_msg(sb, KERN_ERR,
2159 "Cannot turn on journaled "
2160 "quota: error %d", ret);
2165 while (es->s_last_orphan) {
2166 struct inode *inode;
2168 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2169 if (IS_ERR(inode)) {
2170 es->s_last_orphan = 0;
2174 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2175 dquot_initialize(inode);
2176 if (inode->i_nlink) {
2177 ext4_msg(sb, KERN_DEBUG,
2178 "%s: truncating inode %lu to %lld bytes",
2179 __func__, inode->i_ino, inode->i_size);
2180 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2181 inode->i_ino, inode->i_size);
2182 ext4_truncate(inode);
2185 ext4_msg(sb, KERN_DEBUG,
2186 "%s: deleting unreferenced inode %lu",
2187 __func__, inode->i_ino);
2188 jbd_debug(2, "deleting unreferenced inode %lu\n",
2192 iput(inode); /* The delete magic happens here! */
2195 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2198 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2199 PLURAL(nr_orphans));
2201 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2202 PLURAL(nr_truncates));
2204 /* Turn quotas off */
2205 for (i = 0; i < MAXQUOTAS; i++) {
2206 if (sb_dqopt(sb)->files[i])
2207 dquot_quota_off(sb, i);
2210 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2214 * Maximal extent format file size.
2215 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2216 * extent format containers, within a sector_t, and within i_blocks
2217 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2218 * so that won't be a limiting factor.
2220 * However there is other limiting factor. We do store extents in the form
2221 * of starting block and length, hence the resulting length of the extent
2222 * covering maximum file size must fit into on-disk format containers as
2223 * well. Given that length is always by 1 unit bigger than max unit (because
2224 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2226 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2228 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2231 loff_t upper_limit = MAX_LFS_FILESIZE;
2233 /* small i_blocks in vfs inode? */
2234 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2236 * CONFIG_LBDAF is not enabled implies the inode
2237 * i_block represent total blocks in 512 bytes
2238 * 32 == size of vfs inode i_blocks * 8
2240 upper_limit = (1LL << 32) - 1;
2242 /* total blocks in file system block size */
2243 upper_limit >>= (blkbits - 9);
2244 upper_limit <<= blkbits;
2248 * 32-bit extent-start container, ee_block. We lower the maxbytes
2249 * by one fs block, so ee_len can cover the extent of maximum file
2252 res = (1LL << 32) - 1;
2255 /* Sanity check against vm- & vfs- imposed limits */
2256 if (res > upper_limit)
2263 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2264 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2265 * We need to be 1 filesystem block less than the 2^48 sector limit.
2267 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2269 loff_t res = EXT4_NDIR_BLOCKS;
2272 /* This is calculated to be the largest file size for a dense, block
2273 * mapped file such that the file's total number of 512-byte sectors,
2274 * including data and all indirect blocks, does not exceed (2^48 - 1).
2276 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2277 * number of 512-byte sectors of the file.
2280 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2282 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2283 * the inode i_block field represents total file blocks in
2284 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2286 upper_limit = (1LL << 32) - 1;
2288 /* total blocks in file system block size */
2289 upper_limit >>= (bits - 9);
2293 * We use 48 bit ext4_inode i_blocks
2294 * With EXT4_HUGE_FILE_FL set the i_blocks
2295 * represent total number of blocks in
2296 * file system block size
2298 upper_limit = (1LL << 48) - 1;
2302 /* indirect blocks */
2304 /* double indirect blocks */
2305 meta_blocks += 1 + (1LL << (bits-2));
2306 /* tripple indirect blocks */
2307 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2309 upper_limit -= meta_blocks;
2310 upper_limit <<= bits;
2312 res += 1LL << (bits-2);
2313 res += 1LL << (2*(bits-2));
2314 res += 1LL << (3*(bits-2));
2316 if (res > upper_limit)
2319 if (res > MAX_LFS_FILESIZE)
2320 res = MAX_LFS_FILESIZE;
2325 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2326 ext4_fsblk_t logical_sb_block, int nr)
2328 struct ext4_sb_info *sbi = EXT4_SB(sb);
2329 ext4_group_t bg, first_meta_bg;
2332 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2334 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2336 return logical_sb_block + nr + 1;
2337 bg = sbi->s_desc_per_block * nr;
2338 if (ext4_bg_has_super(sb, bg))
2341 return (has_super + ext4_group_first_block_no(sb, bg));
2345 * ext4_get_stripe_size: Get the stripe size.
2346 * @sbi: In memory super block info
2348 * If we have specified it via mount option, then
2349 * use the mount option value. If the value specified at mount time is
2350 * greater than the blocks per group use the super block value.
2351 * If the super block value is greater than blocks per group return 0.
2352 * Allocator needs it be less than blocks per group.
2355 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2357 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2358 unsigned long stripe_width =
2359 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2362 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2363 ret = sbi->s_stripe;
2364 else if (stripe_width <= sbi->s_blocks_per_group)
2366 else if (stride <= sbi->s_blocks_per_group)
2372 * If the stripe width is 1, this makes no sense and
2373 * we set it to 0 to turn off stripe handling code.
2384 struct attribute attr;
2385 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2386 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2387 const char *, size_t);
2391 static int parse_strtoul(const char *buf,
2392 unsigned long max, unsigned long *value)
2396 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2397 endp = skip_spaces(endp);
2398 if (*endp || *value > max)
2404 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2405 struct ext4_sb_info *sbi,
2408 return snprintf(buf, PAGE_SIZE, "%llu\n",
2410 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
2413 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2414 struct ext4_sb_info *sbi, char *buf)
2416 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2418 if (!sb->s_bdev->bd_part)
2419 return snprintf(buf, PAGE_SIZE, "0\n");
2420 return snprintf(buf, PAGE_SIZE, "%lu\n",
2421 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2422 sbi->s_sectors_written_start) >> 1);
2425 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2426 struct ext4_sb_info *sbi, char *buf)
2428 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2430 if (!sb->s_bdev->bd_part)
2431 return snprintf(buf, PAGE_SIZE, "0\n");
2432 return snprintf(buf, PAGE_SIZE, "%llu\n",
2433 (unsigned long long)(sbi->s_kbytes_written +
2434 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2435 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2438 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2439 struct ext4_sb_info *sbi,
2440 const char *buf, size_t count)
2444 if (parse_strtoul(buf, 0x40000000, &t))
2447 if (t && !is_power_of_2(t))
2450 sbi->s_inode_readahead_blks = t;
2454 static ssize_t sbi_ui_show(struct ext4_attr *a,
2455 struct ext4_sb_info *sbi, char *buf)
2457 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2459 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2462 static ssize_t sbi_ui_store(struct ext4_attr *a,
2463 struct ext4_sb_info *sbi,
2464 const char *buf, size_t count)
2466 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2469 if (parse_strtoul(buf, 0xffffffff, &t))
2475 static ssize_t trigger_test_error(struct ext4_attr *a,
2476 struct ext4_sb_info *sbi,
2477 const char *buf, size_t count)
2481 if (!capable(CAP_SYS_ADMIN))
2484 if (len && buf[len-1] == '\n')
2488 ext4_error(sbi->s_sb, "%.*s", len, buf);
2492 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2493 static struct ext4_attr ext4_attr_##_name = { \
2494 .attr = {.name = __stringify(_name), .mode = _mode }, \
2497 .offset = offsetof(struct ext4_sb_info, _elname), \
2499 #define EXT4_ATTR(name, mode, show, store) \
2500 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2502 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2503 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2504 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2505 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2506 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2507 #define ATTR_LIST(name) &ext4_attr_##name.attr
2509 EXT4_RO_ATTR(delayed_allocation_blocks);
2510 EXT4_RO_ATTR(session_write_kbytes);
2511 EXT4_RO_ATTR(lifetime_write_kbytes);
2512 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2513 inode_readahead_blks_store, s_inode_readahead_blks);
2514 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2515 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2516 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2517 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2518 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2519 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2520 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2521 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2522 EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
2524 static struct attribute *ext4_attrs[] = {
2525 ATTR_LIST(delayed_allocation_blocks),
2526 ATTR_LIST(session_write_kbytes),
2527 ATTR_LIST(lifetime_write_kbytes),
2528 ATTR_LIST(inode_readahead_blks),
2529 ATTR_LIST(inode_goal),
2530 ATTR_LIST(mb_stats),
2531 ATTR_LIST(mb_max_to_scan),
2532 ATTR_LIST(mb_min_to_scan),
2533 ATTR_LIST(mb_order2_req),
2534 ATTR_LIST(mb_stream_req),
2535 ATTR_LIST(mb_group_prealloc),
2536 ATTR_LIST(max_writeback_mb_bump),
2537 ATTR_LIST(trigger_fs_error),
2541 /* Features this copy of ext4 supports */
2542 EXT4_INFO_ATTR(lazy_itable_init);
2543 EXT4_INFO_ATTR(batched_discard);
2545 static struct attribute *ext4_feat_attrs[] = {
2546 ATTR_LIST(lazy_itable_init),
2547 ATTR_LIST(batched_discard),
2551 static ssize_t ext4_attr_show(struct kobject *kobj,
2552 struct attribute *attr, char *buf)
2554 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2556 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2558 return a->show ? a->show(a, sbi, buf) : 0;
2561 static ssize_t ext4_attr_store(struct kobject *kobj,
2562 struct attribute *attr,
2563 const char *buf, size_t len)
2565 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2567 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2569 return a->store ? a->store(a, sbi, buf, len) : 0;
2572 static void ext4_sb_release(struct kobject *kobj)
2574 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2576 complete(&sbi->s_kobj_unregister);
2579 static const struct sysfs_ops ext4_attr_ops = {
2580 .show = ext4_attr_show,
2581 .store = ext4_attr_store,
2584 static struct kobj_type ext4_ktype = {
2585 .default_attrs = ext4_attrs,
2586 .sysfs_ops = &ext4_attr_ops,
2587 .release = ext4_sb_release,
2590 static void ext4_feat_release(struct kobject *kobj)
2592 complete(&ext4_feat->f_kobj_unregister);
2595 static struct kobj_type ext4_feat_ktype = {
2596 .default_attrs = ext4_feat_attrs,
2597 .sysfs_ops = &ext4_attr_ops,
2598 .release = ext4_feat_release,
2602 * Check whether this filesystem can be mounted based on
2603 * the features present and the RDONLY/RDWR mount requested.
2604 * Returns 1 if this filesystem can be mounted as requested,
2605 * 0 if it cannot be.
2607 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2609 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2610 ext4_msg(sb, KERN_ERR,
2611 "Couldn't mount because of "
2612 "unsupported optional features (%x)",
2613 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2614 ~EXT4_FEATURE_INCOMPAT_SUPP));
2621 /* Check that feature set is OK for a read-write mount */
2622 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2623 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2624 "unsupported optional features (%x)",
2625 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2626 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2630 * Large file size enabled file system can only be mounted
2631 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2633 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2634 if (sizeof(blkcnt_t) < sizeof(u64)) {
2635 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2636 "cannot be mounted RDWR without "
2641 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2642 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2643 ext4_msg(sb, KERN_ERR,
2644 "Can't support bigalloc feature without "
2645 "extents feature\n");
2652 * This function is called once a day if we have errors logged
2653 * on the file system
2655 static void print_daily_error_info(unsigned long arg)
2657 struct super_block *sb = (struct super_block *) arg;
2658 struct ext4_sb_info *sbi;
2659 struct ext4_super_block *es;
2664 if (es->s_error_count)
2665 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2666 le32_to_cpu(es->s_error_count));
2667 if (es->s_first_error_time) {
2668 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2669 sb->s_id, le32_to_cpu(es->s_first_error_time),
2670 (int) sizeof(es->s_first_error_func),
2671 es->s_first_error_func,
2672 le32_to_cpu(es->s_first_error_line));
2673 if (es->s_first_error_ino)
2674 printk(": inode %u",
2675 le32_to_cpu(es->s_first_error_ino));
2676 if (es->s_first_error_block)
2677 printk(": block %llu", (unsigned long long)
2678 le64_to_cpu(es->s_first_error_block));
2681 if (es->s_last_error_time) {
2682 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2683 sb->s_id, le32_to_cpu(es->s_last_error_time),
2684 (int) sizeof(es->s_last_error_func),
2685 es->s_last_error_func,
2686 le32_to_cpu(es->s_last_error_line));
2687 if (es->s_last_error_ino)
2688 printk(": inode %u",
2689 le32_to_cpu(es->s_last_error_ino));
2690 if (es->s_last_error_block)
2691 printk(": block %llu", (unsigned long long)
2692 le64_to_cpu(es->s_last_error_block));
2695 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2698 /* Find next suitable group and run ext4_init_inode_table */
2699 static int ext4_run_li_request(struct ext4_li_request *elr)
2701 struct ext4_group_desc *gdp = NULL;
2702 ext4_group_t group, ngroups;
2703 struct super_block *sb;
2704 unsigned long timeout = 0;
2708 ngroups = EXT4_SB(sb)->s_groups_count;
2711 for (group = elr->lr_next_group; group < ngroups; group++) {
2712 gdp = ext4_get_group_desc(sb, group, NULL);
2718 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2722 if (group == ngroups)
2727 ret = ext4_init_inode_table(sb, group,
2728 elr->lr_timeout ? 0 : 1);
2729 if (elr->lr_timeout == 0) {
2730 timeout = (jiffies - timeout) *
2731 elr->lr_sbi->s_li_wait_mult;
2732 elr->lr_timeout = timeout;
2734 elr->lr_next_sched = jiffies + elr->lr_timeout;
2735 elr->lr_next_group = group + 1;
2743 * Remove lr_request from the list_request and free the
2744 * request structure. Should be called with li_list_mtx held
2746 static void ext4_remove_li_request(struct ext4_li_request *elr)
2748 struct ext4_sb_info *sbi;
2755 list_del(&elr->lr_request);
2756 sbi->s_li_request = NULL;
2760 static void ext4_unregister_li_request(struct super_block *sb)
2762 mutex_lock(&ext4_li_mtx);
2763 if (!ext4_li_info) {
2764 mutex_unlock(&ext4_li_mtx);
2768 mutex_lock(&ext4_li_info->li_list_mtx);
2769 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2770 mutex_unlock(&ext4_li_info->li_list_mtx);
2771 mutex_unlock(&ext4_li_mtx);
2774 static struct task_struct *ext4_lazyinit_task;
2777 * This is the function where ext4lazyinit thread lives. It walks
2778 * through the request list searching for next scheduled filesystem.
2779 * When such a fs is found, run the lazy initialization request
2780 * (ext4_rn_li_request) and keep track of the time spend in this
2781 * function. Based on that time we compute next schedule time of
2782 * the request. When walking through the list is complete, compute
2783 * next waking time and put itself into sleep.
2785 static int ext4_lazyinit_thread(void *arg)
2787 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2788 struct list_head *pos, *n;
2789 struct ext4_li_request *elr;
2790 unsigned long next_wakeup, cur;
2792 BUG_ON(NULL == eli);
2796 next_wakeup = MAX_JIFFY_OFFSET;
2798 mutex_lock(&eli->li_list_mtx);
2799 if (list_empty(&eli->li_request_list)) {
2800 mutex_unlock(&eli->li_list_mtx);
2804 list_for_each_safe(pos, n, &eli->li_request_list) {
2805 elr = list_entry(pos, struct ext4_li_request,
2808 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2809 if (ext4_run_li_request(elr) != 0) {
2810 /* error, remove the lazy_init job */
2811 ext4_remove_li_request(elr);
2816 if (time_before(elr->lr_next_sched, next_wakeup))
2817 next_wakeup = elr->lr_next_sched;
2819 mutex_unlock(&eli->li_list_mtx);
2824 if ((time_after_eq(cur, next_wakeup)) ||
2825 (MAX_JIFFY_OFFSET == next_wakeup)) {
2830 schedule_timeout_interruptible(next_wakeup - cur);
2832 if (kthread_should_stop()) {
2833 ext4_clear_request_list();
2840 * It looks like the request list is empty, but we need
2841 * to check it under the li_list_mtx lock, to prevent any
2842 * additions into it, and of course we should lock ext4_li_mtx
2843 * to atomically free the list and ext4_li_info, because at
2844 * this point another ext4 filesystem could be registering
2847 mutex_lock(&ext4_li_mtx);
2848 mutex_lock(&eli->li_list_mtx);
2849 if (!list_empty(&eli->li_request_list)) {
2850 mutex_unlock(&eli->li_list_mtx);
2851 mutex_unlock(&ext4_li_mtx);
2854 mutex_unlock(&eli->li_list_mtx);
2855 kfree(ext4_li_info);
2856 ext4_li_info = NULL;
2857 mutex_unlock(&ext4_li_mtx);
2862 static void ext4_clear_request_list(void)
2864 struct list_head *pos, *n;
2865 struct ext4_li_request *elr;
2867 mutex_lock(&ext4_li_info->li_list_mtx);
2868 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2869 elr = list_entry(pos, struct ext4_li_request,
2871 ext4_remove_li_request(elr);
2873 mutex_unlock(&ext4_li_info->li_list_mtx);
2876 static int ext4_run_lazyinit_thread(void)
2878 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2879 ext4_li_info, "ext4lazyinit");
2880 if (IS_ERR(ext4_lazyinit_task)) {
2881 int err = PTR_ERR(ext4_lazyinit_task);
2882 ext4_clear_request_list();
2883 kfree(ext4_li_info);
2884 ext4_li_info = NULL;
2885 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2886 "initialization thread\n",
2890 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2895 * Check whether it make sense to run itable init. thread or not.
2896 * If there is at least one uninitialized inode table, return
2897 * corresponding group number, else the loop goes through all
2898 * groups and return total number of groups.
2900 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2902 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2903 struct ext4_group_desc *gdp = NULL;
2905 for (group = 0; group < ngroups; group++) {
2906 gdp = ext4_get_group_desc(sb, group, NULL);
2910 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2917 static int ext4_li_info_new(void)
2919 struct ext4_lazy_init *eli = NULL;
2921 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2925 INIT_LIST_HEAD(&eli->li_request_list);
2926 mutex_init(&eli->li_list_mtx);
2928 eli->li_state |= EXT4_LAZYINIT_QUIT;
2935 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2938 struct ext4_sb_info *sbi = EXT4_SB(sb);
2939 struct ext4_li_request *elr;
2942 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2948 elr->lr_next_group = start;
2951 * Randomize first schedule time of the request to
2952 * spread the inode table initialization requests
2955 get_random_bytes(&rnd, sizeof(rnd));
2956 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2957 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2962 static int ext4_register_li_request(struct super_block *sb,
2963 ext4_group_t first_not_zeroed)
2965 struct ext4_sb_info *sbi = EXT4_SB(sb);
2966 struct ext4_li_request *elr;
2967 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2970 if (sbi->s_li_request != NULL) {
2972 * Reset timeout so it can be computed again, because
2973 * s_li_wait_mult might have changed.
2975 sbi->s_li_request->lr_timeout = 0;
2979 if (first_not_zeroed == ngroups ||
2980 (sb->s_flags & MS_RDONLY) ||
2981 !test_opt(sb, INIT_INODE_TABLE))
2984 elr = ext4_li_request_new(sb, first_not_zeroed);
2988 mutex_lock(&ext4_li_mtx);
2990 if (NULL == ext4_li_info) {
2991 ret = ext4_li_info_new();
2996 mutex_lock(&ext4_li_info->li_list_mtx);
2997 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2998 mutex_unlock(&ext4_li_info->li_list_mtx);
3000 sbi->s_li_request = elr;
3002 * set elr to NULL here since it has been inserted to
3003 * the request_list and the removal and free of it is
3004 * handled by ext4_clear_request_list from now on.
3008 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3009 ret = ext4_run_lazyinit_thread();
3014 mutex_unlock(&ext4_li_mtx);
3021 * We do not need to lock anything since this is called on
3024 static void ext4_destroy_lazyinit_thread(void)
3027 * If thread exited earlier
3028 * there's nothing to be done.
3030 if (!ext4_li_info || !ext4_lazyinit_task)
3033 kthread_stop(ext4_lazyinit_task);
3036 static int set_journal_csum_feature_set(struct super_block *sb)
3039 int compat, incompat;
3040 struct ext4_sb_info *sbi = EXT4_SB(sb);
3042 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3043 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3044 /* journal checksum v2 */
3046 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3048 /* journal checksum v1 */
3049 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3053 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3054 ret = jbd2_journal_set_features(sbi->s_journal,
3056 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3058 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3059 ret = jbd2_journal_set_features(sbi->s_journal,
3062 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3063 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3065 jbd2_journal_clear_features(sbi->s_journal,
3066 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3067 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3068 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3074 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3076 char *orig_data = kstrdup(data, GFP_KERNEL);
3077 struct buffer_head *bh;
3078 struct ext4_super_block *es = NULL;
3079 struct ext4_sb_info *sbi;
3081 ext4_fsblk_t sb_block = get_sb_block(&data);
3082 ext4_fsblk_t logical_sb_block;
3083 unsigned long offset = 0;
3084 unsigned long journal_devnum = 0;
3085 unsigned long def_mount_opts;
3090 int blocksize, clustersize;
3091 unsigned int db_count;
3093 int needs_recovery, has_huge_files, has_bigalloc;
3096 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3097 ext4_group_t first_not_zeroed;
3099 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3103 sbi->s_blockgroup_lock =
3104 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3105 if (!sbi->s_blockgroup_lock) {
3109 sb->s_fs_info = sbi;
3111 sbi->s_mount_opt = 0;
3112 sbi->s_resuid = make_kuid(&init_user_ns, EXT4_DEF_RESUID);
3113 sbi->s_resgid = make_kgid(&init_user_ns, EXT4_DEF_RESGID);
3114 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3115 sbi->s_sb_block = sb_block;
3116 if (sb->s_bdev->bd_part)
3117 sbi->s_sectors_written_start =
3118 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3120 /* Cleanup superblock name */
3121 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3125 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3127 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3132 * The ext4 superblock will not be buffer aligned for other than 1kB
3133 * block sizes. We need to calculate the offset from buffer start.
3135 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3136 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3137 offset = do_div(logical_sb_block, blocksize);
3139 logical_sb_block = sb_block;
3142 if (!(bh = sb_bread(sb, logical_sb_block))) {
3143 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3147 * Note: s_es must be initialized as soon as possible because
3148 * some ext4 macro-instructions depend on its value
3150 es = (struct ext4_super_block *) (bh->b_data + offset);
3152 sb->s_magic = le16_to_cpu(es->s_magic);
3153 if (sb->s_magic != EXT4_SUPER_MAGIC)
3155 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3157 /* Warn if metadata_csum and gdt_csum are both set. */
3158 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3159 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3160 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3161 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3162 "redundant flags; please run fsck.");
3164 /* Check for a known checksum algorithm */
3165 if (!ext4_verify_csum_type(sb, es)) {
3166 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3167 "unknown checksum algorithm.");
3172 /* Load the checksum driver */
3173 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3174 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3175 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3176 if (IS_ERR(sbi->s_chksum_driver)) {
3177 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3178 ret = PTR_ERR(sbi->s_chksum_driver);
3179 sbi->s_chksum_driver = NULL;
3184 /* Check superblock checksum */
3185 if (!ext4_superblock_csum_verify(sb, es)) {
3186 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3187 "invalid superblock checksum. Run e2fsck?");
3192 /* Precompute checksum seed for all metadata */
3193 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3194 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3195 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3196 sizeof(es->s_uuid));
3198 /* Set defaults before we parse the mount options */
3199 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3200 set_opt(sb, INIT_INODE_TABLE);
3201 if (def_mount_opts & EXT4_DEFM_DEBUG)
3203 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3205 if (def_mount_opts & EXT4_DEFM_UID16)
3206 set_opt(sb, NO_UID32);
3207 /* xattr user namespace & acls are now defaulted on */
3208 #ifdef CONFIG_EXT4_FS_XATTR
3209 set_opt(sb, XATTR_USER);
3211 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3212 set_opt(sb, POSIX_ACL);
3214 set_opt(sb, MBLK_IO_SUBMIT);
3215 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3216 set_opt(sb, JOURNAL_DATA);
3217 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3218 set_opt(sb, ORDERED_DATA);
3219 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3220 set_opt(sb, WRITEBACK_DATA);
3222 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3223 set_opt(sb, ERRORS_PANIC);
3224 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3225 set_opt(sb, ERRORS_CONT);
3227 set_opt(sb, ERRORS_RO);
3228 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3229 set_opt(sb, BLOCK_VALIDITY);
3230 if (def_mount_opts & EXT4_DEFM_DISCARD)
3231 set_opt(sb, DISCARD);
3233 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3234 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3235 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3236 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3237 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3239 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3240 set_opt(sb, BARRIER);
3243 * enable delayed allocation by default
3244 * Use -o nodelalloc to turn it off
3246 if (!IS_EXT3_SB(sb) &&
3247 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3248 set_opt(sb, DELALLOC);
3251 * set default s_li_wait_mult for lazyinit, for the case there is
3252 * no mount option specified.
3254 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3256 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3257 &journal_devnum, &journal_ioprio, 0)) {
3258 ext4_msg(sb, KERN_WARNING,
3259 "failed to parse options in superblock: %s",
3260 sbi->s_es->s_mount_opts);
3262 sbi->s_def_mount_opt = sbi->s_mount_opt;
3263 if (!parse_options((char *) data, sb, &journal_devnum,
3264 &journal_ioprio, 0))
3267 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3268 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3269 "with data=journal disables delayed "
3270 "allocation and O_DIRECT support!\n");
3271 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3272 ext4_msg(sb, KERN_ERR, "can't mount with "
3273 "both data=journal and delalloc");
3276 if (test_opt(sb, DIOREAD_NOLOCK)) {
3277 ext4_msg(sb, KERN_ERR, "can't mount with "
3278 "both data=journal and delalloc");
3281 if (test_opt(sb, DELALLOC))
3282 clear_opt(sb, DELALLOC);
3285 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3286 if (test_opt(sb, DIOREAD_NOLOCK)) {
3287 if (blocksize < PAGE_SIZE) {
3288 ext4_msg(sb, KERN_ERR, "can't mount with "
3289 "dioread_nolock if block size != PAGE_SIZE");
3294 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3295 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3297 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3298 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3299 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3300 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3301 ext4_msg(sb, KERN_WARNING,
3302 "feature flags set on rev 0 fs, "
3303 "running e2fsck is recommended");
3305 if (IS_EXT2_SB(sb)) {
3306 if (ext2_feature_set_ok(sb))
3307 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3308 "using the ext4 subsystem");
3310 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3311 "to feature incompatibilities");
3316 if (IS_EXT3_SB(sb)) {
3317 if (ext3_feature_set_ok(sb))
3318 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3319 "using the ext4 subsystem");
3321 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3322 "to feature incompatibilities");
3328 * Check feature flags regardless of the revision level, since we
3329 * previously didn't change the revision level when setting the flags,
3330 * so there is a chance incompat flags are set on a rev 0 filesystem.
3332 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3335 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3336 blocksize > EXT4_MAX_BLOCK_SIZE) {
3337 ext4_msg(sb, KERN_ERR,
3338 "Unsupported filesystem blocksize %d", blocksize);
3342 if (sb->s_blocksize != blocksize) {
3343 /* Validate the filesystem blocksize */
3344 if (!sb_set_blocksize(sb, blocksize)) {
3345 ext4_msg(sb, KERN_ERR, "bad block size %d",
3351 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3352 offset = do_div(logical_sb_block, blocksize);
3353 bh = sb_bread(sb, logical_sb_block);
3355 ext4_msg(sb, KERN_ERR,
3356 "Can't read superblock on 2nd try");
3359 es = (struct ext4_super_block *)(bh->b_data + offset);
3361 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3362 ext4_msg(sb, KERN_ERR,
3363 "Magic mismatch, very weird!");
3368 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3369 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3370 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3372 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3374 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3375 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3376 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3378 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3379 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3380 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3381 (!is_power_of_2(sbi->s_inode_size)) ||
3382 (sbi->s_inode_size > blocksize)) {
3383 ext4_msg(sb, KERN_ERR,
3384 "unsupported inode size: %d",
3388 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3389 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3392 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3393 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3394 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3395 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3396 !is_power_of_2(sbi->s_desc_size)) {
3397 ext4_msg(sb, KERN_ERR,
3398 "unsupported descriptor size %lu",
3403 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3405 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3406 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3407 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3410 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3411 if (sbi->s_inodes_per_block == 0)
3413 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3414 sbi->s_inodes_per_block;
3415 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3417 sbi->s_mount_state = le16_to_cpu(es->s_state);
3418 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3419 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3421 for (i = 0; i < 4; i++)
3422 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3423 sbi->s_def_hash_version = es->s_def_hash_version;
3424 i = le32_to_cpu(es->s_flags);
3425 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3426 sbi->s_hash_unsigned = 3;
3427 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3428 #ifdef __CHAR_UNSIGNED__
3429 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3430 sbi->s_hash_unsigned = 3;
3432 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3436 /* Handle clustersize */
3437 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3438 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3439 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3441 if (clustersize < blocksize) {
3442 ext4_msg(sb, KERN_ERR,
3443 "cluster size (%d) smaller than "
3444 "block size (%d)", clustersize, blocksize);
3447 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3448 le32_to_cpu(es->s_log_block_size);
3449 sbi->s_clusters_per_group =
3450 le32_to_cpu(es->s_clusters_per_group);
3451 if (sbi->s_clusters_per_group > blocksize * 8) {
3452 ext4_msg(sb, KERN_ERR,
3453 "#clusters per group too big: %lu",
3454 sbi->s_clusters_per_group);
3457 if (sbi->s_blocks_per_group !=
3458 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3459 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3460 "clusters per group (%lu) inconsistent",
3461 sbi->s_blocks_per_group,
3462 sbi->s_clusters_per_group);
3466 if (clustersize != blocksize) {
3467 ext4_warning(sb, "fragment/cluster size (%d) != "
3468 "block size (%d)", clustersize,
3470 clustersize = blocksize;
3472 if (sbi->s_blocks_per_group > blocksize * 8) {
3473 ext4_msg(sb, KERN_ERR,
3474 "#blocks per group too big: %lu",
3475 sbi->s_blocks_per_group);
3478 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3479 sbi->s_cluster_bits = 0;
3481 sbi->s_cluster_ratio = clustersize / blocksize;
3483 if (sbi->s_inodes_per_group > blocksize * 8) {
3484 ext4_msg(sb, KERN_ERR,
3485 "#inodes per group too big: %lu",
3486 sbi->s_inodes_per_group);
3491 * Test whether we have more sectors than will fit in sector_t,
3492 * and whether the max offset is addressable by the page cache.
3494 err = generic_check_addressable(sb->s_blocksize_bits,
3495 ext4_blocks_count(es));
3497 ext4_msg(sb, KERN_ERR, "filesystem"
3498 " too large to mount safely on this system");
3499 if (sizeof(sector_t) < 8)
3500 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3505 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3508 /* check blocks count against device size */
3509 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3510 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3511 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3512 "exceeds size of device (%llu blocks)",
3513 ext4_blocks_count(es), blocks_count);
3518 * It makes no sense for the first data block to be beyond the end
3519 * of the filesystem.
3521 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3522 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3523 "block %u is beyond end of filesystem (%llu)",
3524 le32_to_cpu(es->s_first_data_block),
3525 ext4_blocks_count(es));
3528 blocks_count = (ext4_blocks_count(es) -
3529 le32_to_cpu(es->s_first_data_block) +
3530 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3531 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3532 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3533 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3534 "(block count %llu, first data block %u, "
3535 "blocks per group %lu)", sbi->s_groups_count,
3536 ext4_blocks_count(es),
3537 le32_to_cpu(es->s_first_data_block),
3538 EXT4_BLOCKS_PER_GROUP(sb));
3541 sbi->s_groups_count = blocks_count;
3542 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3543 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3544 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3545 EXT4_DESC_PER_BLOCK(sb);
3546 sbi->s_group_desc = ext4_kvmalloc(db_count *
3547 sizeof(struct buffer_head *),
3549 if (sbi->s_group_desc == NULL) {
3550 ext4_msg(sb, KERN_ERR, "not enough memory");
3556 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3559 proc_create_data("options", S_IRUGO, sbi->s_proc,
3560 &ext4_seq_options_fops, sb);
3562 bgl_lock_init(sbi->s_blockgroup_lock);
3564 for (i = 0; i < db_count; i++) {
3565 block = descriptor_loc(sb, logical_sb_block, i);
3566 sbi->s_group_desc[i] = sb_bread(sb, block);
3567 if (!sbi->s_group_desc[i]) {
3568 ext4_msg(sb, KERN_ERR,
3569 "can't read group descriptor %d", i);
3574 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3575 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3578 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3579 if (!ext4_fill_flex_info(sb)) {
3580 ext4_msg(sb, KERN_ERR,
3581 "unable to initialize "
3582 "flex_bg meta info!");
3586 sbi->s_gdb_count = db_count;
3587 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3588 spin_lock_init(&sbi->s_next_gen_lock);
3590 init_timer(&sbi->s_err_report);
3591 sbi->s_err_report.function = print_daily_error_info;
3592 sbi->s_err_report.data = (unsigned long) sb;
3594 err = percpu_counter_init(&sbi->s_freeclusters_counter,
3595 ext4_count_free_clusters(sb));
3597 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3598 ext4_count_free_inodes(sb));
3601 err = percpu_counter_init(&sbi->s_dirs_counter,
3602 ext4_count_dirs(sb));
3605 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
3608 ext4_msg(sb, KERN_ERR, "insufficient memory");
3613 sbi->s_stripe = ext4_get_stripe_size(sbi);
3614 sbi->s_max_writeback_mb_bump = 128;
3617 * set up enough so that it can read an inode
3619 if (!test_opt(sb, NOLOAD) &&
3620 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3621 sb->s_op = &ext4_sops;
3623 sb->s_op = &ext4_nojournal_sops;
3624 sb->s_export_op = &ext4_export_ops;
3625 sb->s_xattr = ext4_xattr_handlers;
3627 sb->s_qcop = &ext4_qctl_operations;
3628 sb->dq_op = &ext4_quota_operations;
3630 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3632 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3633 mutex_init(&sbi->s_orphan_lock);
3634 sbi->s_resize_flags = 0;
3638 needs_recovery = (es->s_last_orphan != 0 ||
3639 EXT4_HAS_INCOMPAT_FEATURE(sb,
3640 EXT4_FEATURE_INCOMPAT_RECOVER));
3642 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3643 !(sb->s_flags & MS_RDONLY))
3644 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3648 * The first inode we look at is the journal inode. Don't try
3649 * root first: it may be modified in the journal!
3651 if (!test_opt(sb, NOLOAD) &&
3652 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3653 if (ext4_load_journal(sb, es, journal_devnum))
3655 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3656 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3657 ext4_msg(sb, KERN_ERR, "required journal recovery "
3658 "suppressed and not mounted read-only");
3659 goto failed_mount_wq;
3661 clear_opt(sb, DATA_FLAGS);
3662 sbi->s_journal = NULL;
3667 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
3668 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3669 JBD2_FEATURE_INCOMPAT_64BIT)) {
3670 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3671 goto failed_mount_wq;
3674 if (!set_journal_csum_feature_set(sb)) {
3675 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3677 goto failed_mount_wq;
3680 /* We have now updated the journal if required, so we can
3681 * validate the data journaling mode. */
3682 switch (test_opt(sb, DATA_FLAGS)) {
3684 /* No mode set, assume a default based on the journal
3685 * capabilities: ORDERED_DATA if the journal can
3686 * cope, else JOURNAL_DATA
3688 if (jbd2_journal_check_available_features
3689 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3690 set_opt(sb, ORDERED_DATA);
3692 set_opt(sb, JOURNAL_DATA);
3695 case EXT4_MOUNT_ORDERED_DATA:
3696 case EXT4_MOUNT_WRITEBACK_DATA:
3697 if (!jbd2_journal_check_available_features
3698 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3699 ext4_msg(sb, KERN_ERR, "Journal does not support "
3700 "requested data journaling mode");
3701 goto failed_mount_wq;
3706 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3708 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3711 * The journal may have updated the bg summary counts, so we
3712 * need to update the global counters.
3714 percpu_counter_set(&sbi->s_freeclusters_counter,
3715 ext4_count_free_clusters(sb));
3716 percpu_counter_set(&sbi->s_freeinodes_counter,
3717 ext4_count_free_inodes(sb));
3718 percpu_counter_set(&sbi->s_dirs_counter,
3719 ext4_count_dirs(sb));
3720 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
3724 * The maximum number of concurrent works can be high and
3725 * concurrency isn't really necessary. Limit it to 1.
3727 EXT4_SB(sb)->dio_unwritten_wq =
3728 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3729 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3730 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3731 goto failed_mount_wq;
3735 * The jbd2_journal_load will have done any necessary log recovery,
3736 * so we can safely mount the rest of the filesystem now.
3739 root = ext4_iget(sb, EXT4_ROOT_INO);
3741 ext4_msg(sb, KERN_ERR, "get root inode failed");
3742 ret = PTR_ERR(root);
3746 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3747 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
3751 sb->s_root = d_make_root(root);
3753 ext4_msg(sb, KERN_ERR, "get root dentry failed");
3758 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3759 sb->s_flags |= MS_RDONLY;
3761 /* determine the minimum size of new large inodes, if present */
3762 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3763 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3764 EXT4_GOOD_OLD_INODE_SIZE;
3765 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3766 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3767 if (sbi->s_want_extra_isize <
3768 le16_to_cpu(es->s_want_extra_isize))
3769 sbi->s_want_extra_isize =
3770 le16_to_cpu(es->s_want_extra_isize);
3771 if (sbi->s_want_extra_isize <
3772 le16_to_cpu(es->s_min_extra_isize))
3773 sbi->s_want_extra_isize =
3774 le16_to_cpu(es->s_min_extra_isize);
3777 /* Check if enough inode space is available */
3778 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3779 sbi->s_inode_size) {
3780 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3781 EXT4_GOOD_OLD_INODE_SIZE;
3782 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3786 err = ext4_setup_system_zone(sb);
3788 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3790 goto failed_mount4a;
3794 err = ext4_mb_init(sb);
3796 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3801 err = ext4_register_li_request(sb, first_not_zeroed);
3805 sbi->s_kobj.kset = ext4_kset;
3806 init_completion(&sbi->s_kobj_unregister);
3807 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3812 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3813 ext4_orphan_cleanup(sb, es);
3814 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3815 if (needs_recovery) {
3816 ext4_msg(sb, KERN_INFO, "recovery complete");
3817 ext4_mark_recovery_complete(sb, es);
3819 if (EXT4_SB(sb)->s_journal) {
3820 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3821 descr = " journalled data mode";
3822 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3823 descr = " ordered data mode";
3825 descr = " writeback data mode";
3827 descr = "out journal";
3829 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3830 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3831 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
3833 if (es->s_error_count)
3834 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3841 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
3845 ext4_unregister_li_request(sb);
3847 ext4_mb_release(sb);
3849 ext4_ext_release(sb);
3850 ext4_release_system_zone(sb);
3855 ext4_msg(sb, KERN_ERR, "mount failed");
3856 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3858 if (sbi->s_journal) {
3859 jbd2_journal_destroy(sbi->s_journal);
3860 sbi->s_journal = NULL;
3863 del_timer(&sbi->s_err_report);
3864 if (sbi->s_flex_groups)
3865 ext4_kvfree(sbi->s_flex_groups);
3866 percpu_counter_destroy(&sbi->s_freeclusters_counter);
3867 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3868 percpu_counter_destroy(&sbi->s_dirs_counter);
3869 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
3871 kthread_stop(sbi->s_mmp_tsk);
3873 for (i = 0; i < db_count; i++)
3874 brelse(sbi->s_group_desc[i]);
3875 ext4_kvfree(sbi->s_group_desc);
3877 if (sbi->s_chksum_driver)
3878 crypto_free_shash(sbi->s_chksum_driver);
3880 remove_proc_entry("options", sbi->s_proc);
3881 remove_proc_entry(sb->s_id, ext4_proc_root);
3884 for (i = 0; i < MAXQUOTAS; i++)
3885 kfree(sbi->s_qf_names[i]);
3887 ext4_blkdev_remove(sbi);
3890 sb->s_fs_info = NULL;
3891 kfree(sbi->s_blockgroup_lock);
3899 * Setup any per-fs journal parameters now. We'll do this both on
3900 * initial mount, once the journal has been initialised but before we've
3901 * done any recovery; and again on any subsequent remount.
3903 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
3905 struct ext4_sb_info *sbi = EXT4_SB(sb);
3907 journal->j_commit_interval = sbi->s_commit_interval;
3908 journal->j_min_batch_time = sbi->s_min_batch_time;
3909 journal->j_max_batch_time = sbi->s_max_batch_time;
3911 write_lock(&journal->j_state_lock);
3912 if (test_opt(sb, BARRIER))
3913 journal->j_flags |= JBD2_BARRIER;
3915 journal->j_flags &= ~JBD2_BARRIER;
3916 if (test_opt(sb, DATA_ERR_ABORT))
3917 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3919 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
3920 write_unlock(&journal->j_state_lock);
3923 static journal_t *ext4_get_journal(struct super_block *sb,
3924 unsigned int journal_inum)
3926 struct inode *journal_inode;
3929 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3931 /* First, test for the existence of a valid inode on disk. Bad
3932 * things happen if we iget() an unused inode, as the subsequent
3933 * iput() will try to delete it. */
3935 journal_inode = ext4_iget(sb, journal_inum);
3936 if (IS_ERR(journal_inode)) {
3937 ext4_msg(sb, KERN_ERR, "no journal found");
3940 if (!journal_inode->i_nlink) {
3941 make_bad_inode(journal_inode);
3942 iput(journal_inode);
3943 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
3947 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3948 journal_inode, journal_inode->i_size);
3949 if (!S_ISREG(journal_inode->i_mode)) {
3950 ext4_msg(sb, KERN_ERR, "invalid journal inode");
3951 iput(journal_inode);
3955 journal = jbd2_journal_init_inode(journal_inode);
3957 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
3958 iput(journal_inode);
3961 journal->j_private = sb;
3962 ext4_init_journal_params(sb, journal);
3966 static journal_t *ext4_get_dev_journal(struct super_block *sb,
3969 struct buffer_head *bh;
3973 int hblock, blocksize;
3974 ext4_fsblk_t sb_block;
3975 unsigned long offset;
3976 struct ext4_super_block *es;
3977 struct block_device *bdev;
3979 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3981 bdev = ext4_blkdev_get(j_dev, sb);
3985 blocksize = sb->s_blocksize;
3986 hblock = bdev_logical_block_size(bdev);
3987 if (blocksize < hblock) {
3988 ext4_msg(sb, KERN_ERR,
3989 "blocksize too small for journal device");
3993 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3994 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3995 set_blocksize(bdev, blocksize);
3996 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3997 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3998 "external journal");
4002 es = (struct ext4_super_block *) (bh->b_data + offset);
4003 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4004 !(le32_to_cpu(es->s_feature_incompat) &
4005 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4006 ext4_msg(sb, KERN_ERR, "external journal has "
4012 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4013 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4018 len = ext4_blocks_count(es);
4019 start = sb_block + 1;
4020 brelse(bh); /* we're done with the superblock */
4022 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4023 start, len, blocksize);
4025 ext4_msg(sb, KERN_ERR, "failed to create device journal");
4028 journal->j_private = sb;
4029 ll_rw_block(READ, 1, &journal->j_sb_buffer);
4030 wait_on_buffer(journal->j_sb_buffer);
4031 if (!buffer_uptodate(journal->j_sb_buffer)) {
4032 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4035 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4036 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4037 "user (unsupported) - %d",
4038 be32_to_cpu(journal->j_superblock->s_nr_users));
4041 EXT4_SB(sb)->journal_bdev = bdev;
4042 ext4_init_journal_params(sb, journal);
4046 jbd2_journal_destroy(journal);
4048 ext4_blkdev_put(bdev);
4052 static int ext4_load_journal(struct super_block *sb,
4053 struct ext4_super_block *es,
4054 unsigned long journal_devnum)
4057 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4060 int really_read_only;
4062 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4064 if (journal_devnum &&
4065 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4066 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4067 "numbers have changed");
4068 journal_dev = new_decode_dev(journal_devnum);
4070 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4072 really_read_only = bdev_read_only(sb->s_bdev);
4075 * Are we loading a blank journal or performing recovery after a
4076 * crash? For recovery, we need to check in advance whether we
4077 * can get read-write access to the device.
4079 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4080 if (sb->s_flags & MS_RDONLY) {
4081 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4082 "required on readonly filesystem");
4083 if (really_read_only) {
4084 ext4_msg(sb, KERN_ERR, "write access "
4085 "unavailable, cannot proceed");
4088 ext4_msg(sb, KERN_INFO, "write access will "
4089 "be enabled during recovery");
4093 if (journal_inum && journal_dev) {
4094 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4095 "and inode journals!");
4100 if (!(journal = ext4_get_journal(sb, journal_inum)))
4103 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4107 if (!(journal->j_flags & JBD2_BARRIER))
4108 ext4_msg(sb, KERN_INFO, "barriers disabled");
4110 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4111 err = jbd2_journal_wipe(journal, !really_read_only);
4113 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4115 memcpy(save, ((char *) es) +
4116 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4117 err = jbd2_journal_load(journal);
4119 memcpy(((char *) es) + EXT4_S_ERR_START,
4120 save, EXT4_S_ERR_LEN);
4125 ext4_msg(sb, KERN_ERR, "error loading journal");
4126 jbd2_journal_destroy(journal);
4130 EXT4_SB(sb)->s_journal = journal;
4131 ext4_clear_journal_err(sb, es);
4133 if (!really_read_only && journal_devnum &&
4134 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4135 es->s_journal_dev = cpu_to_le32(journal_devnum);
4137 /* Make sure we flush the recovery flag to disk. */
4138 ext4_commit_super(sb, 1);
4144 static int ext4_commit_super(struct super_block *sb, int sync)
4146 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4147 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4150 if (!sbh || block_device_ejected(sb))
4152 if (buffer_write_io_error(sbh)) {
4154 * Oh, dear. A previous attempt to write the
4155 * superblock failed. This could happen because the
4156 * USB device was yanked out. Or it could happen to
4157 * be a transient write error and maybe the block will
4158 * be remapped. Nothing we can do but to retry the
4159 * write and hope for the best.
4161 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4162 "superblock detected");
4163 clear_buffer_write_io_error(sbh);
4164 set_buffer_uptodate(sbh);
4167 * If the file system is mounted read-only, don't update the
4168 * superblock write time. This avoids updating the superblock
4169 * write time when we are mounting the root file system
4170 * read/only but we need to replay the journal; at that point,
4171 * for people who are east of GMT and who make their clock
4172 * tick in localtime for Windows bug-for-bug compatibility,
4173 * the clock is set in the future, and this will cause e2fsck
4174 * to complain and force a full file system check.
4176 if (!(sb->s_flags & MS_RDONLY))
4177 es->s_wtime = cpu_to_le32(get_seconds());
4178 if (sb->s_bdev->bd_part)
4179 es->s_kbytes_written =
4180 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4181 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4182 EXT4_SB(sb)->s_sectors_written_start) >> 1));
4184 es->s_kbytes_written =
4185 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4186 ext4_free_blocks_count_set(es,
4187 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4188 &EXT4_SB(sb)->s_freeclusters_counter)));
4189 es->s_free_inodes_count =
4190 cpu_to_le32(percpu_counter_sum_positive(
4191 &EXT4_SB(sb)->s_freeinodes_counter));
4193 BUFFER_TRACE(sbh, "marking dirty");
4194 ext4_superblock_csum_set(sb, es);
4195 mark_buffer_dirty(sbh);
4197 error = sync_dirty_buffer(sbh);
4201 error = buffer_write_io_error(sbh);
4203 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4205 clear_buffer_write_io_error(sbh);
4206 set_buffer_uptodate(sbh);
4213 * Have we just finished recovery? If so, and if we are mounting (or
4214 * remounting) the filesystem readonly, then we will end up with a
4215 * consistent fs on disk. Record that fact.
4217 static void ext4_mark_recovery_complete(struct super_block *sb,
4218 struct ext4_super_block *es)
4220 journal_t *journal = EXT4_SB(sb)->s_journal;
4222 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4223 BUG_ON(journal != NULL);
4226 jbd2_journal_lock_updates(journal);
4227 if (jbd2_journal_flush(journal) < 0)
4230 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4231 sb->s_flags & MS_RDONLY) {
4232 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4233 ext4_commit_super(sb, 1);
4237 jbd2_journal_unlock_updates(journal);
4241 * If we are mounting (or read-write remounting) a filesystem whose journal
4242 * has recorded an error from a previous lifetime, move that error to the
4243 * main filesystem now.
4245 static void ext4_clear_journal_err(struct super_block *sb,
4246 struct ext4_super_block *es)
4252 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4254 journal = EXT4_SB(sb)->s_journal;
4257 * Now check for any error status which may have been recorded in the
4258 * journal by a prior ext4_error() or ext4_abort()
4261 j_errno = jbd2_journal_errno(journal);
4265 errstr = ext4_decode_error(sb, j_errno, nbuf);
4266 ext4_warning(sb, "Filesystem error recorded "
4267 "from previous mount: %s", errstr);
4268 ext4_warning(sb, "Marking fs in need of filesystem check.");
4270 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4271 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4272 ext4_commit_super(sb, 1);
4274 jbd2_journal_clear_err(journal);
4279 * Force the running and committing transactions to commit,
4280 * and wait on the commit.
4282 int ext4_force_commit(struct super_block *sb)
4287 if (sb->s_flags & MS_RDONLY)
4290 journal = EXT4_SB(sb)->s_journal;
4292 ret = ext4_journal_force_commit(journal);
4297 static void ext4_write_super(struct super_block *sb)
4300 ext4_commit_super(sb, 1);
4304 static int ext4_sync_fs(struct super_block *sb, int wait)
4308 struct ext4_sb_info *sbi = EXT4_SB(sb);
4310 trace_ext4_sync_fs(sb, wait);
4311 flush_workqueue(sbi->dio_unwritten_wq);
4313 * Writeback quota in non-journalled quota case - journalled quota has
4316 dquot_writeback_dquots(sb, -1);
4317 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4319 jbd2_log_wait_commit(sbi->s_journal, target);
4325 * LVM calls this function before a (read-only) snapshot is created. This
4326 * gives us a chance to flush the journal completely and mark the fs clean.
4328 * Note that only this function cannot bring a filesystem to be in a clean
4329 * state independently. It relies on upper layer to stop all data & metadata
4332 static int ext4_freeze(struct super_block *sb)
4337 if (sb->s_flags & MS_RDONLY)
4340 journal = EXT4_SB(sb)->s_journal;
4342 /* Now we set up the journal barrier. */
4343 jbd2_journal_lock_updates(journal);
4346 * Don't clear the needs_recovery flag if we failed to flush
4349 error = jbd2_journal_flush(journal);
4353 /* Journal blocked and flushed, clear needs_recovery flag. */
4354 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4355 error = ext4_commit_super(sb, 1);
4357 /* we rely on upper layer to stop further updates */
4358 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4363 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4364 * flag here, even though the filesystem is not technically dirty yet.
4366 static int ext4_unfreeze(struct super_block *sb)
4368 if (sb->s_flags & MS_RDONLY)
4372 /* Reset the needs_recovery flag before the fs is unlocked. */
4373 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4374 ext4_commit_super(sb, 1);
4380 * Structure to save mount options for ext4_remount's benefit
4382 struct ext4_mount_options {
4383 unsigned long s_mount_opt;
4384 unsigned long s_mount_opt2;
4387 unsigned long s_commit_interval;
4388 u32 s_min_batch_time, s_max_batch_time;
4391 char *s_qf_names[MAXQUOTAS];
4395 static int ext4_remount(struct super_block *sb, int *flags, char *data)
4397 struct ext4_super_block *es;
4398 struct ext4_sb_info *sbi = EXT4_SB(sb);
4399 unsigned long old_sb_flags;
4400 struct ext4_mount_options old_opts;
4401 int enable_quota = 0;
4403 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4408 char *orig_data = kstrdup(data, GFP_KERNEL);
4410 /* Store the original options */
4412 old_sb_flags = sb->s_flags;
4413 old_opts.s_mount_opt = sbi->s_mount_opt;
4414 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4415 old_opts.s_resuid = sbi->s_resuid;
4416 old_opts.s_resgid = sbi->s_resgid;
4417 old_opts.s_commit_interval = sbi->s_commit_interval;
4418 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4419 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4421 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4422 for (i = 0; i < MAXQUOTAS; i++)
4423 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4425 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4426 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4429 * Allow the "check" option to be passed as a remount option.
4431 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4436 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4437 ext4_abort(sb, "Abort forced by user");
4439 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4440 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4444 if (sbi->s_journal) {
4445 ext4_init_journal_params(sb, sbi->s_journal);
4446 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4449 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4450 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4455 if (*flags & MS_RDONLY) {
4456 err = dquot_suspend(sb, -1);
4461 * First of all, the unconditional stuff we have to do
4462 * to disable replay of the journal when we next remount
4464 sb->s_flags |= MS_RDONLY;
4467 * OK, test if we are remounting a valid rw partition
4468 * readonly, and if so set the rdonly flag and then
4469 * mark the partition as valid again.
4471 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4472 (sbi->s_mount_state & EXT4_VALID_FS))
4473 es->s_state = cpu_to_le16(sbi->s_mount_state);
4476 ext4_mark_recovery_complete(sb, es);
4478 /* Make sure we can mount this feature set readwrite */
4479 if (!ext4_feature_set_ok(sb, 0)) {
4484 * Make sure the group descriptor checksums
4485 * are sane. If they aren't, refuse to remount r/w.
4487 for (g = 0; g < sbi->s_groups_count; g++) {
4488 struct ext4_group_desc *gdp =
4489 ext4_get_group_desc(sb, g, NULL);
4491 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4492 ext4_msg(sb, KERN_ERR,
4493 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4494 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4495 le16_to_cpu(gdp->bg_checksum));
4502 * If we have an unprocessed orphan list hanging
4503 * around from a previously readonly bdev mount,
4504 * require a full umount/remount for now.
4506 if (es->s_last_orphan) {
4507 ext4_msg(sb, KERN_WARNING, "Couldn't "
4508 "remount RDWR because of unprocessed "
4509 "orphan inode list. Please "
4510 "umount/remount instead");
4516 * Mounting a RDONLY partition read-write, so reread
4517 * and store the current valid flag. (It may have
4518 * been changed by e2fsck since we originally mounted
4522 ext4_clear_journal_err(sb, es);
4523 sbi->s_mount_state = le16_to_cpu(es->s_state);
4524 if (!ext4_setup_super(sb, es, 0))
4525 sb->s_flags &= ~MS_RDONLY;
4526 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4527 EXT4_FEATURE_INCOMPAT_MMP))
4528 if (ext4_multi_mount_protect(sb,
4529 le64_to_cpu(es->s_mmp_block))) {
4538 * Reinitialize lazy itable initialization thread based on
4541 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4542 ext4_unregister_li_request(sb);
4544 ext4_group_t first_not_zeroed;
4545 first_not_zeroed = ext4_has_uninit_itable(sb);
4546 ext4_register_li_request(sb, first_not_zeroed);
4549 ext4_setup_system_zone(sb);
4550 if (sbi->s_journal == NULL)
4551 ext4_commit_super(sb, 1);
4554 /* Release old quota file names */
4555 for (i = 0; i < MAXQUOTAS; i++)
4556 if (old_opts.s_qf_names[i] &&
4557 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4558 kfree(old_opts.s_qf_names[i]);
4562 dquot_resume(sb, -1);
4564 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4569 sb->s_flags = old_sb_flags;
4570 sbi->s_mount_opt = old_opts.s_mount_opt;
4571 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4572 sbi->s_resuid = old_opts.s_resuid;
4573 sbi->s_resgid = old_opts.s_resgid;
4574 sbi->s_commit_interval = old_opts.s_commit_interval;
4575 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4576 sbi->s_max_batch_time = old_opts.s_max_batch_time;
4578 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4579 for (i = 0; i < MAXQUOTAS; i++) {
4580 if (sbi->s_qf_names[i] &&
4581 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4582 kfree(sbi->s_qf_names[i]);
4583 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4592 * Note: calculating the overhead so we can be compatible with
4593 * historical BSD practice is quite difficult in the face of
4594 * clusters/bigalloc. This is because multiple metadata blocks from
4595 * different block group can end up in the same allocation cluster.
4596 * Calculating the exact overhead in the face of clustered allocation
4597 * requires either O(all block bitmaps) in memory or O(number of block
4598 * groups**2) in time. We will still calculate the superblock for
4599 * older file systems --- and if we come across with a bigalloc file
4600 * system with zero in s_overhead_clusters the estimate will be close to
4601 * correct especially for very large cluster sizes --- but for newer
4602 * file systems, it's better to calculate this figure once at mkfs
4603 * time, and store it in the superblock. If the superblock value is
4604 * present (even for non-bigalloc file systems), we will use it.
4606 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4608 struct super_block *sb = dentry->d_sb;
4609 struct ext4_sb_info *sbi = EXT4_SB(sb);
4610 struct ext4_super_block *es = sbi->s_es;
4611 struct ext4_group_desc *gdp;
4615 if (test_opt(sb, MINIX_DF)) {
4616 sbi->s_overhead_last = 0;
4617 } else if (es->s_overhead_clusters) {
4618 sbi->s_overhead_last = le32_to_cpu(es->s_overhead_clusters);
4619 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
4620 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4621 ext4_fsblk_t overhead = 0;
4624 * Compute the overhead (FS structures). This is constant
4625 * for a given filesystem unless the number of block groups
4626 * changes so we cache the previous value until it does.
4630 * All of the blocks before first_data_block are
4633 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
4636 * Add the overhead found in each block group
4638 for (i = 0; i < ngroups; i++) {
4639 gdp = ext4_get_group_desc(sb, i, NULL);
4640 overhead += ext4_num_overhead_clusters(sb, i, gdp);
4643 sbi->s_overhead_last = overhead;
4645 sbi->s_blocks_last = ext4_blocks_count(es);
4648 buf->f_type = EXT4_SUPER_MAGIC;
4649 buf->f_bsize = sb->s_blocksize;
4650 buf->f_blocks = (ext4_blocks_count(es) -
4651 EXT4_C2B(sbi, sbi->s_overhead_last));
4652 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4653 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4654 /* prevent underflow in case that few free space is available */
4655 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
4656 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4657 if (buf->f_bfree < ext4_r_blocks_count(es))
4659 buf->f_files = le32_to_cpu(es->s_inodes_count);
4660 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4661 buf->f_namelen = EXT4_NAME_LEN;
4662 fsid = le64_to_cpup((void *)es->s_uuid) ^
4663 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4664 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4665 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4670 /* Helper function for writing quotas on sync - we need to start transaction
4671 * before quota file is locked for write. Otherwise the are possible deadlocks:
4672 * Process 1 Process 2
4673 * ext4_create() quota_sync()
4674 * jbd2_journal_start() write_dquot()
4675 * dquot_initialize() down(dqio_mutex)
4676 * down(dqio_mutex) jbd2_journal_start()
4682 static inline struct inode *dquot_to_inode(struct dquot *dquot)
4684 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4687 static int ext4_write_dquot(struct dquot *dquot)
4691 struct inode *inode;
4693 inode = dquot_to_inode(dquot);
4694 handle = ext4_journal_start(inode,
4695 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4697 return PTR_ERR(handle);
4698 ret = dquot_commit(dquot);
4699 err = ext4_journal_stop(handle);
4705 static int ext4_acquire_dquot(struct dquot *dquot)
4710 handle = ext4_journal_start(dquot_to_inode(dquot),
4711 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4713 return PTR_ERR(handle);
4714 ret = dquot_acquire(dquot);
4715 err = ext4_journal_stop(handle);
4721 static int ext4_release_dquot(struct dquot *dquot)
4726 handle = ext4_journal_start(dquot_to_inode(dquot),
4727 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
4728 if (IS_ERR(handle)) {
4729 /* Release dquot anyway to avoid endless cycle in dqput() */
4730 dquot_release(dquot);
4731 return PTR_ERR(handle);
4733 ret = dquot_release(dquot);
4734 err = ext4_journal_stop(handle);
4740 static int ext4_mark_dquot_dirty(struct dquot *dquot)
4742 /* Are we journaling quotas? */
4743 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4744 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
4745 dquot_mark_dquot_dirty(dquot);
4746 return ext4_write_dquot(dquot);
4748 return dquot_mark_dquot_dirty(dquot);
4752 static int ext4_write_info(struct super_block *sb, int type)
4757 /* Data block + inode block */
4758 handle = ext4_journal_start(sb->s_root->d_inode, 2);
4760 return PTR_ERR(handle);
4761 ret = dquot_commit_info(sb, type);
4762 err = ext4_journal_stop(handle);
4769 * Turn on quotas during mount time - we need to find
4770 * the quota file and such...
4772 static int ext4_quota_on_mount(struct super_block *sb, int type)
4774 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4775 EXT4_SB(sb)->s_jquota_fmt, type);
4779 * Standard function to be called on quota_on
4781 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
4786 if (!test_opt(sb, QUOTA))
4789 /* Quotafile not on the same filesystem? */
4790 if (path->dentry->d_sb != sb)
4792 /* Journaling quota? */
4793 if (EXT4_SB(sb)->s_qf_names[type]) {
4794 /* Quotafile not in fs root? */
4795 if (path->dentry->d_parent != sb->s_root)
4796 ext4_msg(sb, KERN_WARNING,
4797 "Quota file not on filesystem root. "
4798 "Journaled quota will not work");
4802 * When we journal data on quota file, we have to flush journal to see
4803 * all updates to the file when we bypass pagecache...
4805 if (EXT4_SB(sb)->s_journal &&
4806 ext4_should_journal_data(path->dentry->d_inode)) {
4808 * We don't need to lock updates but journal_flush() could
4809 * otherwise be livelocked...
4811 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
4812 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
4813 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4818 return dquot_quota_on(sb, type, format_id, path);
4821 static int ext4_quota_off(struct super_block *sb, int type)
4823 struct inode *inode = sb_dqopt(sb)->files[type];
4826 /* Force all delayed allocation blocks to be allocated.
4827 * Caller already holds s_umount sem */
4828 if (test_opt(sb, DELALLOC))
4829 sync_filesystem(sb);
4834 /* Update modification times of quota files when userspace can
4835 * start looking at them */
4836 handle = ext4_journal_start(inode, 1);
4839 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4840 ext4_mark_inode_dirty(handle, inode);
4841 ext4_journal_stop(handle);
4844 return dquot_quota_off(sb, type);
4847 /* Read data from quotafile - avoid pagecache and such because we cannot afford
4848 * acquiring the locks... As quota files are never truncated and quota code
4849 * itself serializes the operations (and no one else should touch the files)
4850 * we don't have to be afraid of races */
4851 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
4852 size_t len, loff_t off)
4854 struct inode *inode = sb_dqopt(sb)->files[type];
4855 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4857 int offset = off & (sb->s_blocksize - 1);
4860 struct buffer_head *bh;
4861 loff_t i_size = i_size_read(inode);
4865 if (off+len > i_size)
4868 while (toread > 0) {
4869 tocopy = sb->s_blocksize - offset < toread ?
4870 sb->s_blocksize - offset : toread;
4871 bh = ext4_bread(NULL, inode, blk, 0, &err);
4874 if (!bh) /* A hole? */
4875 memset(data, 0, tocopy);
4877 memcpy(data, bh->b_data+offset, tocopy);
4887 /* Write to quotafile (we know the transaction is already started and has
4888 * enough credits) */
4889 static ssize_t ext4_quota_write(struct super_block *sb, int type,
4890 const char *data, size_t len, loff_t off)
4892 struct inode *inode = sb_dqopt(sb)->files[type];
4893 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4895 int offset = off & (sb->s_blocksize - 1);
4896 struct buffer_head *bh;
4897 handle_t *handle = journal_current_handle();
4899 if (EXT4_SB(sb)->s_journal && !handle) {
4900 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4901 " cancelled because transaction is not started",
4902 (unsigned long long)off, (unsigned long long)len);
4906 * Since we account only one data block in transaction credits,
4907 * then it is impossible to cross a block boundary.
4909 if (sb->s_blocksize - offset < len) {
4910 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4911 " cancelled because not block aligned",
4912 (unsigned long long)off, (unsigned long long)len);
4916 bh = ext4_bread(handle, inode, blk, 1, &err);
4919 err = ext4_journal_get_write_access(handle, bh);
4925 memcpy(bh->b_data+offset, data, len);
4926 flush_dcache_page(bh->b_page);
4928 err = ext4_handle_dirty_metadata(handle, NULL, bh);
4933 if (inode->i_size < off + len) {
4934 i_size_write(inode, off + len);
4935 EXT4_I(inode)->i_disksize = inode->i_size;
4936 ext4_mark_inode_dirty(handle, inode);
4943 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4944 const char *dev_name, void *data)
4946 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
4949 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4950 static inline void register_as_ext2(void)
4952 int err = register_filesystem(&ext2_fs_type);
4955 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4958 static inline void unregister_as_ext2(void)
4960 unregister_filesystem(&ext2_fs_type);
4963 static inline int ext2_feature_set_ok(struct super_block *sb)
4965 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
4967 if (sb->s_flags & MS_RDONLY)
4969 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
4973 MODULE_ALIAS("ext2");
4975 static inline void register_as_ext2(void) { }
4976 static inline void unregister_as_ext2(void) { }
4977 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
4980 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4981 static inline void register_as_ext3(void)
4983 int err = register_filesystem(&ext3_fs_type);
4986 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4989 static inline void unregister_as_ext3(void)
4991 unregister_filesystem(&ext3_fs_type);
4994 static inline int ext3_feature_set_ok(struct super_block *sb)
4996 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
4998 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5000 if (sb->s_flags & MS_RDONLY)
5002 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5006 MODULE_ALIAS("ext3");
5008 static inline void register_as_ext3(void) { }
5009 static inline void unregister_as_ext3(void) { }
5010 static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
5013 static struct file_system_type ext4_fs_type = {
5014 .owner = THIS_MODULE,
5016 .mount = ext4_mount,
5017 .kill_sb = kill_block_super,
5018 .fs_flags = FS_REQUIRES_DEV,
5021 static int __init ext4_init_feat_adverts(void)
5023 struct ext4_features *ef;
5026 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5030 ef->f_kobj.kset = ext4_kset;
5031 init_completion(&ef->f_kobj_unregister);
5032 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5045 static void ext4_exit_feat_adverts(void)
5047 kobject_put(&ext4_feat->f_kobj);
5048 wait_for_completion(&ext4_feat->f_kobj_unregister);
5052 /* Shared across all ext4 file systems */
5053 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5054 struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5056 static int __init ext4_init_fs(void)
5060 ext4_li_info = NULL;
5061 mutex_init(&ext4_li_mtx);
5063 ext4_check_flag_values();
5065 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5066 mutex_init(&ext4__aio_mutex[i]);
5067 init_waitqueue_head(&ext4__ioend_wq[i]);
5070 err = ext4_init_pageio();
5073 err = ext4_init_system_zone();
5076 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5079 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
5081 err = ext4_init_feat_adverts();
5085 err = ext4_init_mballoc();
5089 err = ext4_init_xattr();
5092 err = init_inodecache();
5097 err = register_filesystem(&ext4_fs_type);
5103 unregister_as_ext2();
5104 unregister_as_ext3();
5105 destroy_inodecache();
5109 ext4_exit_mballoc();
5111 ext4_exit_feat_adverts();
5114 remove_proc_entry("fs/ext4", NULL);
5115 kset_unregister(ext4_kset);
5117 ext4_exit_system_zone();
5123 static void __exit ext4_exit_fs(void)
5125 ext4_destroy_lazyinit_thread();
5126 unregister_as_ext2();
5127 unregister_as_ext3();
5128 unregister_filesystem(&ext4_fs_type);
5129 destroy_inodecache();
5131 ext4_exit_mballoc();
5132 ext4_exit_feat_adverts();
5133 remove_proc_entry("fs/ext4", NULL);
5134 kset_unregister(ext4_kset);
5135 ext4_exit_system_zone();
5139 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5140 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5141 MODULE_LICENSE("GPL");
5142 module_init(ext4_init_fs)
5143 module_exit(ext4_exit_fs)