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_commit_super(struct super_block *sb, int sync);
66 static void ext4_mark_recovery_complete(struct super_block *sb,
67 struct ext4_super_block *es);
68 static void ext4_clear_journal_err(struct super_block *sb,
69 struct ext4_super_block *es);
70 static int ext4_sync_fs(struct super_block *sb, int wait);
71 static const char *ext4_decode_error(struct super_block *sb, int errno,
73 static int ext4_remount(struct super_block *sb, int *flags, char *data);
74 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
75 static int ext4_unfreeze(struct super_block *sb);
76 static void ext4_write_super(struct super_block *sb);
77 static int ext4_freeze(struct super_block *sb);
78 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
80 static inline int ext2_feature_set_ok(struct super_block *sb);
81 static inline int ext3_feature_set_ok(struct super_block *sb);
82 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
83 static void ext4_destroy_lazyinit_thread(void);
84 static void ext4_unregister_li_request(struct super_block *sb);
85 static void ext4_clear_request_list(void);
87 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88 static struct file_system_type ext2_fs_type = {
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
95 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
97 #define IS_EXT2_SB(sb) (0)
101 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
102 static struct file_system_type ext3_fs_type = {
103 .owner = THIS_MODULE,
106 .kill_sb = kill_block_super,
107 .fs_flags = FS_REQUIRES_DEV,
109 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
111 #define IS_EXT3_SB(sb) (0)
114 void *ext4_kvmalloc(size_t size, gfp_t flags)
118 ret = kmalloc(size, flags);
120 ret = __vmalloc(size, flags, PAGE_KERNEL);
124 void *ext4_kvzalloc(size_t size, gfp_t flags)
128 ret = kzalloc(size, flags);
130 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
134 void ext4_kvfree(void *ptr)
136 if (is_vmalloc_addr(ptr))
143 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
144 struct ext4_group_desc *bg)
146 return le32_to_cpu(bg->bg_block_bitmap_lo) |
147 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
148 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
151 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
152 struct ext4_group_desc *bg)
154 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
155 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
156 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
159 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
160 struct ext4_group_desc *bg)
162 return le32_to_cpu(bg->bg_inode_table_lo) |
163 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
164 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
167 __u32 ext4_free_group_clusters(struct super_block *sb,
168 struct ext4_group_desc *bg)
170 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
171 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
172 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
175 __u32 ext4_free_inodes_count(struct super_block *sb,
176 struct ext4_group_desc *bg)
178 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
179 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
180 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
183 __u32 ext4_used_dirs_count(struct super_block *sb,
184 struct ext4_group_desc *bg)
186 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
187 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
188 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
191 __u32 ext4_itable_unused_count(struct super_block *sb,
192 struct ext4_group_desc *bg)
194 return le16_to_cpu(bg->bg_itable_unused_lo) |
195 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
196 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
199 void ext4_block_bitmap_set(struct super_block *sb,
200 struct ext4_group_desc *bg, ext4_fsblk_t blk)
202 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
203 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
204 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
207 void ext4_inode_bitmap_set(struct super_block *sb,
208 struct ext4_group_desc *bg, ext4_fsblk_t blk)
210 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
211 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
212 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
215 void ext4_inode_table_set(struct super_block *sb,
216 struct ext4_group_desc *bg, ext4_fsblk_t blk)
218 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
219 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
220 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
223 void ext4_free_group_clusters_set(struct super_block *sb,
224 struct ext4_group_desc *bg, __u32 count)
226 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
227 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
228 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
231 void ext4_free_inodes_set(struct super_block *sb,
232 struct ext4_group_desc *bg, __u32 count)
234 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
235 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
236 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
239 void ext4_used_dirs_set(struct super_block *sb,
240 struct ext4_group_desc *bg, __u32 count)
242 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
243 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
244 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
247 void ext4_itable_unused_set(struct super_block *sb,
248 struct ext4_group_desc *bg, __u32 count)
250 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
251 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
252 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
256 /* Just increment the non-pointer handle value */
257 static handle_t *ext4_get_nojournal(void)
259 handle_t *handle = current->journal_info;
260 unsigned long ref_cnt = (unsigned long)handle;
262 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
265 handle = (handle_t *)ref_cnt;
267 current->journal_info = handle;
272 /* Decrement the non-pointer handle value */
273 static void ext4_put_nojournal(handle_t *handle)
275 unsigned long ref_cnt = (unsigned long)handle;
277 BUG_ON(ref_cnt == 0);
280 handle = (handle_t *)ref_cnt;
282 current->journal_info = handle;
286 * Wrappers for jbd2_journal_start/end.
288 * The only special thing we need to do here is to make sure that all
289 * journal_end calls result in the superblock being marked dirty, so
290 * that sync() will call the filesystem's write_super callback if
293 * To avoid j_barrier hold in userspace when a user calls freeze(),
294 * ext4 prevents a new handle from being started by s_frozen, which
295 * is in an upper layer.
297 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
302 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
303 if (sb->s_flags & MS_RDONLY)
304 return ERR_PTR(-EROFS);
306 journal = EXT4_SB(sb)->s_journal;
307 handle = ext4_journal_current_handle();
310 * If a handle has been started, it should be allowed to
311 * finish, otherwise deadlock could happen between freeze
312 * and others(e.g. truncate) due to the restart of the
313 * journal handle if the filesystem is forzen and active
314 * handles are not stopped.
317 vfs_check_frozen(sb, SB_FREEZE_TRANS);
320 return ext4_get_nojournal();
322 * Special case here: if the journal has aborted behind our
323 * backs (eg. EIO in the commit thread), then we still need to
324 * take the FS itself readonly cleanly.
326 if (is_journal_aborted(journal)) {
327 ext4_abort(sb, "Detected aborted journal");
328 return ERR_PTR(-EROFS);
330 return jbd2_journal_start(journal, nblocks);
334 * The only special thing we need to do here is to make sure that all
335 * jbd2_journal_stop calls result in the superblock being marked dirty, so
336 * that sync() will call the filesystem's write_super callback if
339 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
341 struct super_block *sb;
345 if (!ext4_handle_valid(handle)) {
346 ext4_put_nojournal(handle);
349 sb = handle->h_transaction->t_journal->j_private;
351 rc = jbd2_journal_stop(handle);
356 __ext4_std_error(sb, where, line, err);
360 void ext4_journal_abort_handle(const char *caller, unsigned int line,
361 const char *err_fn, struct buffer_head *bh,
362 handle_t *handle, int err)
365 const char *errstr = ext4_decode_error(NULL, err, nbuf);
367 BUG_ON(!ext4_handle_valid(handle));
370 BUFFER_TRACE(bh, "abort");
375 if (is_handle_aborted(handle))
378 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
379 caller, line, errstr, err_fn);
381 jbd2_journal_abort_handle(handle);
384 static void __save_error_info(struct super_block *sb, const char *func,
387 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
389 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
390 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
391 es->s_last_error_time = cpu_to_le32(get_seconds());
392 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
393 es->s_last_error_line = cpu_to_le32(line);
394 if (!es->s_first_error_time) {
395 es->s_first_error_time = es->s_last_error_time;
396 strncpy(es->s_first_error_func, func,
397 sizeof(es->s_first_error_func));
398 es->s_first_error_line = cpu_to_le32(line);
399 es->s_first_error_ino = es->s_last_error_ino;
400 es->s_first_error_block = es->s_last_error_block;
403 * Start the daily error reporting function if it hasn't been
406 if (!es->s_error_count)
407 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
408 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
411 static void save_error_info(struct super_block *sb, const char *func,
414 __save_error_info(sb, func, line);
415 ext4_commit_super(sb, 1);
419 * The del_gendisk() function uninitializes the disk-specific data
420 * structures, including the bdi structure, without telling anyone
421 * else. Once this happens, any attempt to call mark_buffer_dirty()
422 * (for example, by ext4_commit_super), will cause a kernel OOPS.
423 * This is a kludge to prevent these oops until we can put in a proper
424 * hook in del_gendisk() to inform the VFS and file system layers.
426 static int block_device_ejected(struct super_block *sb)
428 struct inode *bd_inode = sb->s_bdev->bd_inode;
429 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
431 return bdi->dev == NULL;
435 /* Deal with the reporting of failure conditions on a filesystem such as
436 * inconsistencies detected or read IO failures.
438 * On ext2, we can store the error state of the filesystem in the
439 * superblock. That is not possible on ext4, because we may have other
440 * write ordering constraints on the superblock which prevent us from
441 * writing it out straight away; and given that the journal is about to
442 * be aborted, we can't rely on the current, or future, transactions to
443 * write out the superblock safely.
445 * We'll just use the jbd2_journal_abort() error code to record an error in
446 * the journal instead. On recovery, the journal will complain about
447 * that error until we've noted it down and cleared it.
450 static void ext4_handle_error(struct super_block *sb)
452 if (sb->s_flags & MS_RDONLY)
455 if (!test_opt(sb, ERRORS_CONT)) {
456 journal_t *journal = EXT4_SB(sb)->s_journal;
458 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
460 jbd2_journal_abort(journal, -EIO);
462 if (test_opt(sb, ERRORS_RO)) {
463 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
464 sb->s_flags |= MS_RDONLY;
466 if (test_opt(sb, ERRORS_PANIC)) {
467 if (EXT4_SB(sb)->s_journal &&
468 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
470 panic("EXT4-fs (device %s): panic forced after error\n",
475 void __ext4_error(struct super_block *sb, const char *function,
476 unsigned int line, const char *fmt, ...)
478 struct va_format vaf;
484 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
485 sb->s_id, function, line, current->comm, &vaf);
487 save_error_info(sb, function, line);
489 ext4_handle_error(sb);
492 void ext4_error_inode(struct inode *inode, const char *function,
493 unsigned int line, ext4_fsblk_t block,
494 const char *fmt, ...)
497 struct va_format vaf;
498 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
500 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
501 es->s_last_error_block = cpu_to_le64(block);
502 save_error_info(inode->i_sb, function, line);
506 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
507 inode->i_sb->s_id, function, line, inode->i_ino);
509 printk(KERN_CONT "block %llu: ", block);
510 printk(KERN_CONT "comm %s: %pV\n", current->comm, &vaf);
513 ext4_handle_error(inode->i_sb);
516 void ext4_error_file(struct file *file, const char *function,
517 unsigned int line, ext4_fsblk_t block,
518 const char *fmt, ...)
521 struct va_format vaf;
522 struct ext4_super_block *es;
523 struct inode *inode = file->f_dentry->d_inode;
524 char pathname[80], *path;
526 es = EXT4_SB(inode->i_sb)->s_es;
527 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
528 save_error_info(inode->i_sb, function, line);
529 path = d_path(&(file->f_path), pathname, sizeof(pathname));
533 "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
534 inode->i_sb->s_id, function, line, inode->i_ino);
536 printk(KERN_CONT "block %llu: ", block);
540 printk(KERN_CONT "comm %s: path %s: %pV\n", current->comm, path, &vaf);
543 ext4_handle_error(inode->i_sb);
546 static const char *ext4_decode_error(struct super_block *sb, int errno,
553 errstr = "IO failure";
556 errstr = "Out of memory";
559 if (!sb || (EXT4_SB(sb)->s_journal &&
560 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
561 errstr = "Journal has aborted";
563 errstr = "Readonly filesystem";
566 /* If the caller passed in an extra buffer for unknown
567 * errors, textualise them now. Else we just return
570 /* Check for truncated error codes... */
571 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
580 /* __ext4_std_error decodes expected errors from journaling functions
581 * automatically and invokes the appropriate error response. */
583 void __ext4_std_error(struct super_block *sb, const char *function,
584 unsigned int line, int errno)
589 /* Special case: if the error is EROFS, and we're not already
590 * inside a transaction, then there's really no point in logging
592 if (errno == -EROFS && journal_current_handle() == NULL &&
593 (sb->s_flags & MS_RDONLY))
596 errstr = ext4_decode_error(sb, errno, nbuf);
597 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
598 sb->s_id, function, line, errstr);
599 save_error_info(sb, function, line);
601 ext4_handle_error(sb);
605 * ext4_abort is a much stronger failure handler than ext4_error. The
606 * abort function may be used to deal with unrecoverable failures such
607 * as journal IO errors or ENOMEM at a critical moment in log management.
609 * We unconditionally force the filesystem into an ABORT|READONLY state,
610 * unless the error response on the fs has been set to panic in which
611 * case we take the easy way out and panic immediately.
614 void __ext4_abort(struct super_block *sb, const char *function,
615 unsigned int line, const char *fmt, ...)
619 save_error_info(sb, function, line);
621 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
627 if ((sb->s_flags & MS_RDONLY) == 0) {
628 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
629 sb->s_flags |= MS_RDONLY;
630 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
631 if (EXT4_SB(sb)->s_journal)
632 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
633 save_error_info(sb, function, line);
635 if (test_opt(sb, ERRORS_PANIC)) {
636 if (EXT4_SB(sb)->s_journal &&
637 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
639 panic("EXT4-fs panic from previous error\n");
643 void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
645 struct va_format vaf;
651 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
655 void __ext4_warning(struct super_block *sb, const char *function,
656 unsigned int line, const char *fmt, ...)
658 struct va_format vaf;
664 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
665 sb->s_id, function, line, &vaf);
669 void __ext4_grp_locked_error(const char *function, unsigned int line,
670 struct super_block *sb, ext4_group_t grp,
671 unsigned long ino, ext4_fsblk_t block,
672 const char *fmt, ...)
676 struct va_format vaf;
678 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
680 es->s_last_error_ino = cpu_to_le32(ino);
681 es->s_last_error_block = cpu_to_le64(block);
682 __save_error_info(sb, function, line);
688 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
689 sb->s_id, function, line, grp);
691 printk(KERN_CONT "inode %lu: ", ino);
693 printk(KERN_CONT "block %llu:", (unsigned long long) block);
694 printk(KERN_CONT "%pV\n", &vaf);
697 if (test_opt(sb, ERRORS_CONT)) {
698 ext4_commit_super(sb, 0);
702 ext4_unlock_group(sb, grp);
703 ext4_handle_error(sb);
705 * We only get here in the ERRORS_RO case; relocking the group
706 * may be dangerous, but nothing bad will happen since the
707 * filesystem will have already been marked read/only and the
708 * journal has been aborted. We return 1 as a hint to callers
709 * who might what to use the return value from
710 * ext4_grp_locked_error() to distinguish between the
711 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
712 * aggressively from the ext4 function in question, with a
713 * more appropriate error code.
715 ext4_lock_group(sb, grp);
719 void ext4_update_dynamic_rev(struct super_block *sb)
721 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
723 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
727 "updating to rev %d because of new feature flag, "
728 "running e2fsck is recommended",
731 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
732 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
733 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
734 /* leave es->s_feature_*compat flags alone */
735 /* es->s_uuid will be set by e2fsck if empty */
738 * The rest of the superblock fields should be zero, and if not it
739 * means they are likely already in use, so leave them alone. We
740 * can leave it up to e2fsck to clean up any inconsistencies there.
745 * Open the external journal device
747 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
749 struct block_device *bdev;
750 char b[BDEVNAME_SIZE];
752 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
758 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
759 __bdevname(dev, b), PTR_ERR(bdev));
764 * Release the journal device
766 static int ext4_blkdev_put(struct block_device *bdev)
768 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
771 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
773 struct block_device *bdev;
776 bdev = sbi->journal_bdev;
778 ret = ext4_blkdev_put(bdev);
779 sbi->journal_bdev = NULL;
784 static inline struct inode *orphan_list_entry(struct list_head *l)
786 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
789 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
793 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
794 le32_to_cpu(sbi->s_es->s_last_orphan));
796 printk(KERN_ERR "sb_info orphan list:\n");
797 list_for_each(l, &sbi->s_orphan) {
798 struct inode *inode = orphan_list_entry(l);
800 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
801 inode->i_sb->s_id, inode->i_ino, inode,
802 inode->i_mode, inode->i_nlink,
807 static void ext4_put_super(struct super_block *sb)
809 struct ext4_sb_info *sbi = EXT4_SB(sb);
810 struct ext4_super_block *es = sbi->s_es;
813 ext4_unregister_li_request(sb);
814 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
816 flush_workqueue(sbi->dio_unwritten_wq);
817 destroy_workqueue(sbi->dio_unwritten_wq);
821 ext4_commit_super(sb, 1);
823 if (sbi->s_journal) {
824 err = jbd2_journal_destroy(sbi->s_journal);
825 sbi->s_journal = NULL;
827 ext4_abort(sb, "Couldn't clean up the journal");
830 del_timer_sync(&sbi->s_err_report);
831 ext4_release_system_zone(sb);
833 ext4_ext_release(sb);
834 ext4_xattr_put_super(sb);
836 if (!(sb->s_flags & MS_RDONLY)) {
837 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
838 es->s_state = cpu_to_le16(sbi->s_mount_state);
839 ext4_commit_super(sb, 1);
842 remove_proc_entry(sb->s_id, ext4_proc_root);
844 kobject_del(&sbi->s_kobj);
846 for (i = 0; i < sbi->s_gdb_count; i++)
847 brelse(sbi->s_group_desc[i]);
848 ext4_kvfree(sbi->s_group_desc);
849 ext4_kvfree(sbi->s_flex_groups);
850 percpu_counter_destroy(&sbi->s_freeclusters_counter);
851 percpu_counter_destroy(&sbi->s_freeinodes_counter);
852 percpu_counter_destroy(&sbi->s_dirs_counter);
853 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
856 for (i = 0; i < MAXQUOTAS; i++)
857 kfree(sbi->s_qf_names[i]);
860 /* Debugging code just in case the in-memory inode orphan list
861 * isn't empty. The on-disk one can be non-empty if we've
862 * detected an error and taken the fs readonly, but the
863 * in-memory list had better be clean by this point. */
864 if (!list_empty(&sbi->s_orphan))
865 dump_orphan_list(sb, sbi);
866 J_ASSERT(list_empty(&sbi->s_orphan));
868 sync_blockdev(sb->s_bdev);
869 invalidate_bdev(sb->s_bdev);
870 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
872 * Invalidate the journal device's buffers. We don't want them
873 * floating about in memory - the physical journal device may
874 * hotswapped, and it breaks the `ro-after' testing code.
876 sync_blockdev(sbi->journal_bdev);
877 invalidate_bdev(sbi->journal_bdev);
878 ext4_blkdev_remove(sbi);
881 kthread_stop(sbi->s_mmp_tsk);
882 sb->s_fs_info = NULL;
884 * Now that we are completely done shutting down the
885 * superblock, we need to actually destroy the kobject.
888 kobject_put(&sbi->s_kobj);
889 wait_for_completion(&sbi->s_kobj_unregister);
890 kfree(sbi->s_blockgroup_lock);
894 static struct kmem_cache *ext4_inode_cachep;
897 * Called inside transaction, so use GFP_NOFS
899 static struct inode *ext4_alloc_inode(struct super_block *sb)
901 struct ext4_inode_info *ei;
903 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
907 ei->vfs_inode.i_version = 1;
908 ei->vfs_inode.i_data.writeback_index = 0;
909 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
910 INIT_LIST_HEAD(&ei->i_prealloc_list);
911 spin_lock_init(&ei->i_prealloc_lock);
912 ei->i_reserved_data_blocks = 0;
913 ei->i_reserved_meta_blocks = 0;
914 ei->i_allocated_meta_blocks = 0;
915 ei->i_da_metadata_calc_len = 0;
916 ei->i_da_metadata_calc_last_lblock = 0;
917 spin_lock_init(&(ei->i_block_reservation_lock));
919 ei->i_reserved_quota = 0;
922 INIT_LIST_HEAD(&ei->i_completed_io_list);
923 spin_lock_init(&ei->i_completed_io_lock);
924 ei->cur_aio_dio = NULL;
926 ei->i_datasync_tid = 0;
927 atomic_set(&ei->i_ioend_count, 0);
928 atomic_set(&ei->i_aiodio_unwritten, 0);
930 return &ei->vfs_inode;
933 static int ext4_drop_inode(struct inode *inode)
935 int drop = generic_drop_inode(inode);
937 trace_ext4_drop_inode(inode, drop);
941 static void ext4_i_callback(struct rcu_head *head)
943 struct inode *inode = container_of(head, struct inode, i_rcu);
944 INIT_LIST_HEAD(&inode->i_dentry);
945 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
948 static void ext4_destroy_inode(struct inode *inode)
950 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
951 ext4_msg(inode->i_sb, KERN_ERR,
952 "Inode %lu (%p): orphan list check failed!",
953 inode->i_ino, EXT4_I(inode));
954 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
955 EXT4_I(inode), sizeof(struct ext4_inode_info),
959 call_rcu(&inode->i_rcu, ext4_i_callback);
962 static void init_once(void *foo)
964 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
966 INIT_LIST_HEAD(&ei->i_orphan);
967 #ifdef CONFIG_EXT4_FS_XATTR
968 init_rwsem(&ei->xattr_sem);
970 init_rwsem(&ei->i_data_sem);
971 inode_init_once(&ei->vfs_inode);
974 static int init_inodecache(void)
976 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
977 sizeof(struct ext4_inode_info),
978 0, (SLAB_RECLAIM_ACCOUNT|
981 if (ext4_inode_cachep == NULL)
986 static void destroy_inodecache(void)
988 kmem_cache_destroy(ext4_inode_cachep);
991 void ext4_clear_inode(struct inode *inode)
993 invalidate_inode_buffers(inode);
994 end_writeback(inode);
996 ext4_discard_preallocations(inode);
997 if (EXT4_I(inode)->jinode) {
998 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
999 EXT4_I(inode)->jinode);
1000 jbd2_free_inode(EXT4_I(inode)->jinode);
1001 EXT4_I(inode)->jinode = NULL;
1005 static inline void ext4_show_quota_options(struct seq_file *seq,
1006 struct super_block *sb)
1008 #if defined(CONFIG_QUOTA)
1009 struct ext4_sb_info *sbi = EXT4_SB(sb);
1011 if (sbi->s_jquota_fmt) {
1014 switch (sbi->s_jquota_fmt) {
1025 seq_printf(seq, ",jqfmt=%s", fmtname);
1028 if (sbi->s_qf_names[USRQUOTA])
1029 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
1031 if (sbi->s_qf_names[GRPQUOTA])
1032 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
1034 if (test_opt(sb, USRQUOTA))
1035 seq_puts(seq, ",usrquota");
1037 if (test_opt(sb, GRPQUOTA))
1038 seq_puts(seq, ",grpquota");
1044 * - it's set to a non-default value OR
1045 * - if the per-sb default is different from the global default
1047 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
1050 unsigned long def_mount_opts;
1051 struct super_block *sb = vfs->mnt_sb;
1052 struct ext4_sb_info *sbi = EXT4_SB(sb);
1053 struct ext4_super_block *es = sbi->s_es;
1055 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1056 def_errors = le16_to_cpu(es->s_errors);
1058 if (sbi->s_sb_block != 1)
1059 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
1060 if (test_opt(sb, MINIX_DF))
1061 seq_puts(seq, ",minixdf");
1062 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
1063 seq_puts(seq, ",grpid");
1064 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
1065 seq_puts(seq, ",nogrpid");
1066 if (sbi->s_resuid != EXT4_DEF_RESUID ||
1067 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
1068 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
1070 if (sbi->s_resgid != EXT4_DEF_RESGID ||
1071 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
1072 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
1074 if (test_opt(sb, ERRORS_RO)) {
1075 if (def_errors == EXT4_ERRORS_PANIC ||
1076 def_errors == EXT4_ERRORS_CONTINUE) {
1077 seq_puts(seq, ",errors=remount-ro");
1080 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1081 seq_puts(seq, ",errors=continue");
1082 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1083 seq_puts(seq, ",errors=panic");
1084 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
1085 seq_puts(seq, ",nouid32");
1086 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
1087 seq_puts(seq, ",debug");
1088 #ifdef CONFIG_EXT4_FS_XATTR
1089 if (test_opt(sb, XATTR_USER))
1090 seq_puts(seq, ",user_xattr");
1091 if (!test_opt(sb, XATTR_USER))
1092 seq_puts(seq, ",nouser_xattr");
1094 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1095 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
1096 seq_puts(seq, ",acl");
1097 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
1098 seq_puts(seq, ",noacl");
1100 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
1101 seq_printf(seq, ",commit=%u",
1102 (unsigned) (sbi->s_commit_interval / HZ));
1104 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
1105 seq_printf(seq, ",min_batch_time=%u",
1106 (unsigned) sbi->s_min_batch_time);
1108 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
1109 seq_printf(seq, ",max_batch_time=%u",
1110 (unsigned) sbi->s_max_batch_time);
1114 * We're changing the default of barrier mount option, so
1115 * let's always display its mount state so it's clear what its
1118 seq_puts(seq, ",barrier=");
1119 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
1120 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
1121 seq_puts(seq, ",journal_async_commit");
1122 else if (test_opt(sb, JOURNAL_CHECKSUM))
1123 seq_puts(seq, ",journal_checksum");
1124 if (test_opt(sb, I_VERSION))
1125 seq_puts(seq, ",i_version");
1126 if (!test_opt(sb, DELALLOC) &&
1127 !(def_mount_opts & EXT4_DEFM_NODELALLOC))
1128 seq_puts(seq, ",nodelalloc");
1130 if (!test_opt(sb, MBLK_IO_SUBMIT))
1131 seq_puts(seq, ",nomblk_io_submit");
1133 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
1135 * journal mode get enabled in different ways
1136 * So just print the value even if we didn't specify it
1138 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1139 seq_puts(seq, ",data=journal");
1140 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1141 seq_puts(seq, ",data=ordered");
1142 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1143 seq_puts(seq, ",data=writeback");
1145 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1146 seq_printf(seq, ",inode_readahead_blks=%u",
1147 sbi->s_inode_readahead_blks);
1149 if (test_opt(sb, DATA_ERR_ABORT))
1150 seq_puts(seq, ",data_err=abort");
1152 if (test_opt(sb, NO_AUTO_DA_ALLOC))
1153 seq_puts(seq, ",noauto_da_alloc");
1155 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
1156 seq_puts(seq, ",discard");
1158 if (test_opt(sb, NOLOAD))
1159 seq_puts(seq, ",norecovery");
1161 if (test_opt(sb, DIOREAD_NOLOCK))
1162 seq_puts(seq, ",dioread_nolock");
1164 if (test_opt(sb, BLOCK_VALIDITY) &&
1165 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
1166 seq_puts(seq, ",block_validity");
1168 if (!test_opt(sb, INIT_INODE_TABLE))
1169 seq_puts(seq, ",noinit_itable");
1170 else if (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)
1171 seq_printf(seq, ",init_itable=%u",
1172 (unsigned) sbi->s_li_wait_mult);
1174 ext4_show_quota_options(seq, sb);
1179 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1180 u64 ino, u32 generation)
1182 struct inode *inode;
1184 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1185 return ERR_PTR(-ESTALE);
1186 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1187 return ERR_PTR(-ESTALE);
1189 /* iget isn't really right if the inode is currently unallocated!!
1191 * ext4_read_inode will return a bad_inode if the inode had been
1192 * deleted, so we should be safe.
1194 * Currently we don't know the generation for parent directory, so
1195 * a generation of 0 means "accept any"
1197 inode = ext4_iget_normal(sb, ino);
1199 return ERR_CAST(inode);
1200 if (generation && inode->i_generation != generation) {
1202 return ERR_PTR(-ESTALE);
1208 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1209 int fh_len, int fh_type)
1211 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1212 ext4_nfs_get_inode);
1215 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1216 int fh_len, int fh_type)
1218 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1219 ext4_nfs_get_inode);
1223 * Try to release metadata pages (indirect blocks, directories) which are
1224 * mapped via the block device. Since these pages could have journal heads
1225 * which would prevent try_to_free_buffers() from freeing them, we must use
1226 * jbd2 layer's try_to_free_buffers() function to release them.
1228 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1231 journal_t *journal = EXT4_SB(sb)->s_journal;
1233 WARN_ON(PageChecked(page));
1234 if (!page_has_buffers(page))
1237 return jbd2_journal_try_to_free_buffers(journal, page,
1238 wait & ~__GFP_WAIT);
1239 return try_to_free_buffers(page);
1243 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1244 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1246 static int ext4_write_dquot(struct dquot *dquot);
1247 static int ext4_acquire_dquot(struct dquot *dquot);
1248 static int ext4_release_dquot(struct dquot *dquot);
1249 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1250 static int ext4_write_info(struct super_block *sb, int type);
1251 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1253 static int ext4_quota_off(struct super_block *sb, int type);
1254 static int ext4_quota_on_mount(struct super_block *sb, int type);
1255 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1256 size_t len, loff_t off);
1257 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1258 const char *data, size_t len, loff_t off);
1260 static const struct dquot_operations ext4_quota_operations = {
1261 .get_reserved_space = ext4_get_reserved_space,
1262 .write_dquot = ext4_write_dquot,
1263 .acquire_dquot = ext4_acquire_dquot,
1264 .release_dquot = ext4_release_dquot,
1265 .mark_dirty = ext4_mark_dquot_dirty,
1266 .write_info = ext4_write_info,
1267 .alloc_dquot = dquot_alloc,
1268 .destroy_dquot = dquot_destroy,
1271 static const struct quotactl_ops ext4_qctl_operations = {
1272 .quota_on = ext4_quota_on,
1273 .quota_off = ext4_quota_off,
1274 .quota_sync = dquot_quota_sync,
1275 .get_info = dquot_get_dqinfo,
1276 .set_info = dquot_set_dqinfo,
1277 .get_dqblk = dquot_get_dqblk,
1278 .set_dqblk = dquot_set_dqblk
1282 static const struct super_operations ext4_sops = {
1283 .alloc_inode = ext4_alloc_inode,
1284 .destroy_inode = ext4_destroy_inode,
1285 .write_inode = ext4_write_inode,
1286 .dirty_inode = ext4_dirty_inode,
1287 .drop_inode = ext4_drop_inode,
1288 .evict_inode = ext4_evict_inode,
1289 .put_super = ext4_put_super,
1290 .sync_fs = ext4_sync_fs,
1291 .freeze_fs = ext4_freeze,
1292 .unfreeze_fs = ext4_unfreeze,
1293 .statfs = ext4_statfs,
1294 .remount_fs = ext4_remount,
1295 .show_options = ext4_show_options,
1297 .quota_read = ext4_quota_read,
1298 .quota_write = ext4_quota_write,
1300 .bdev_try_to_free_page = bdev_try_to_free_page,
1303 static const struct super_operations ext4_nojournal_sops = {
1304 .alloc_inode = ext4_alloc_inode,
1305 .destroy_inode = ext4_destroy_inode,
1306 .write_inode = ext4_write_inode,
1307 .dirty_inode = ext4_dirty_inode,
1308 .drop_inode = ext4_drop_inode,
1309 .evict_inode = ext4_evict_inode,
1310 .write_super = ext4_write_super,
1311 .put_super = ext4_put_super,
1312 .statfs = ext4_statfs,
1313 .remount_fs = ext4_remount,
1314 .show_options = ext4_show_options,
1316 .quota_read = ext4_quota_read,
1317 .quota_write = ext4_quota_write,
1319 .bdev_try_to_free_page = bdev_try_to_free_page,
1322 static const struct export_operations ext4_export_ops = {
1323 .fh_to_dentry = ext4_fh_to_dentry,
1324 .fh_to_parent = ext4_fh_to_parent,
1325 .get_parent = ext4_get_parent,
1329 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1330 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1331 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1332 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1333 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1334 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1335 Opt_journal_update, Opt_journal_dev,
1336 Opt_journal_checksum, Opt_journal_async_commit,
1337 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1338 Opt_data_err_abort, Opt_data_err_ignore,
1339 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1340 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1341 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1342 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
1343 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1344 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1345 Opt_inode_readahead_blks, Opt_journal_ioprio,
1346 Opt_dioread_nolock, Opt_dioread_lock,
1347 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1350 static const match_table_t tokens = {
1351 {Opt_bsd_df, "bsddf"},
1352 {Opt_minix_df, "minixdf"},
1353 {Opt_grpid, "grpid"},
1354 {Opt_grpid, "bsdgroups"},
1355 {Opt_nogrpid, "nogrpid"},
1356 {Opt_nogrpid, "sysvgroups"},
1357 {Opt_resgid, "resgid=%u"},
1358 {Opt_resuid, "resuid=%u"},
1360 {Opt_err_cont, "errors=continue"},
1361 {Opt_err_panic, "errors=panic"},
1362 {Opt_err_ro, "errors=remount-ro"},
1363 {Opt_nouid32, "nouid32"},
1364 {Opt_debug, "debug"},
1365 {Opt_oldalloc, "oldalloc"},
1366 {Opt_orlov, "orlov"},
1367 {Opt_user_xattr, "user_xattr"},
1368 {Opt_nouser_xattr, "nouser_xattr"},
1370 {Opt_noacl, "noacl"},
1371 {Opt_noload, "noload"},
1372 {Opt_noload, "norecovery"},
1375 {Opt_commit, "commit=%u"},
1376 {Opt_min_batch_time, "min_batch_time=%u"},
1377 {Opt_max_batch_time, "max_batch_time=%u"},
1378 {Opt_journal_update, "journal=update"},
1379 {Opt_journal_dev, "journal_dev=%u"},
1380 {Opt_journal_checksum, "journal_checksum"},
1381 {Opt_journal_async_commit, "journal_async_commit"},
1382 {Opt_abort, "abort"},
1383 {Opt_data_journal, "data=journal"},
1384 {Opt_data_ordered, "data=ordered"},
1385 {Opt_data_writeback, "data=writeback"},
1386 {Opt_data_err_abort, "data_err=abort"},
1387 {Opt_data_err_ignore, "data_err=ignore"},
1388 {Opt_offusrjquota, "usrjquota="},
1389 {Opt_usrjquota, "usrjquota=%s"},
1390 {Opt_offgrpjquota, "grpjquota="},
1391 {Opt_grpjquota, "grpjquota=%s"},
1392 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1393 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1394 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1395 {Opt_grpquota, "grpquota"},
1396 {Opt_noquota, "noquota"},
1397 {Opt_quota, "quota"},
1398 {Opt_usrquota, "usrquota"},
1399 {Opt_barrier, "barrier=%u"},
1400 {Opt_barrier, "barrier"},
1401 {Opt_nobarrier, "nobarrier"},
1402 {Opt_i_version, "i_version"},
1403 {Opt_stripe, "stripe=%u"},
1404 {Opt_resize, "resize"},
1405 {Opt_delalloc, "delalloc"},
1406 {Opt_nodelalloc, "nodelalloc"},
1407 {Opt_mblk_io_submit, "mblk_io_submit"},
1408 {Opt_nomblk_io_submit, "nomblk_io_submit"},
1409 {Opt_block_validity, "block_validity"},
1410 {Opt_noblock_validity, "noblock_validity"},
1411 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1412 {Opt_journal_ioprio, "journal_ioprio=%u"},
1413 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1414 {Opt_auto_da_alloc, "auto_da_alloc"},
1415 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1416 {Opt_dioread_nolock, "dioread_nolock"},
1417 {Opt_dioread_lock, "dioread_lock"},
1418 {Opt_discard, "discard"},
1419 {Opt_nodiscard, "nodiscard"},
1420 {Opt_init_itable, "init_itable=%u"},
1421 {Opt_init_itable, "init_itable"},
1422 {Opt_noinit_itable, "noinit_itable"},
1426 static ext4_fsblk_t get_sb_block(void **data)
1428 ext4_fsblk_t sb_block;
1429 char *options = (char *) *data;
1431 if (!options || strncmp(options, "sb=", 3) != 0)
1432 return 1; /* Default location */
1435 /* TODO: use simple_strtoll with >32bit ext4 */
1436 sb_block = simple_strtoul(options, &options, 0);
1437 if (*options && *options != ',') {
1438 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1442 if (*options == ',')
1444 *data = (void *) options;
1449 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1450 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1451 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1454 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1456 struct ext4_sb_info *sbi = EXT4_SB(sb);
1459 if (sb_any_quota_loaded(sb) &&
1460 !sbi->s_qf_names[qtype]) {
1461 ext4_msg(sb, KERN_ERR,
1462 "Cannot change journaled "
1463 "quota options when quota turned on");
1466 qname = match_strdup(args);
1468 ext4_msg(sb, KERN_ERR,
1469 "Not enough memory for storing quotafile name");
1472 if (sbi->s_qf_names[qtype] &&
1473 strcmp(sbi->s_qf_names[qtype], qname)) {
1474 ext4_msg(sb, KERN_ERR,
1475 "%s quota file already specified", QTYPE2NAME(qtype));
1479 sbi->s_qf_names[qtype] = qname;
1480 if (strchr(sbi->s_qf_names[qtype], '/')) {
1481 ext4_msg(sb, KERN_ERR,
1482 "quotafile must be on filesystem root");
1483 kfree(sbi->s_qf_names[qtype]);
1484 sbi->s_qf_names[qtype] = NULL;
1491 static int clear_qf_name(struct super_block *sb, int qtype)
1494 struct ext4_sb_info *sbi = EXT4_SB(sb);
1496 if (sb_any_quota_loaded(sb) &&
1497 sbi->s_qf_names[qtype]) {
1498 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1499 " when quota turned on");
1503 * The space will be released later when all options are confirmed
1506 sbi->s_qf_names[qtype] = NULL;
1511 static int parse_options(char *options, struct super_block *sb,
1512 unsigned long *journal_devnum,
1513 unsigned int *journal_ioprio,
1514 ext4_fsblk_t *n_blocks_count, int is_remount)
1516 struct ext4_sb_info *sbi = EXT4_SB(sb);
1518 substring_t args[MAX_OPT_ARGS];
1528 while ((p = strsep(&options, ",")) != NULL) {
1534 * Initialize args struct so we know whether arg was
1535 * found; some options take optional arguments.
1537 args[0].to = args[0].from = NULL;
1538 token = match_token(p, tokens, args);
1541 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1542 clear_opt(sb, MINIX_DF);
1545 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1546 set_opt(sb, MINIX_DF);
1550 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1555 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1556 clear_opt(sb, GRPID);
1560 if (match_int(&args[0], &option))
1562 sbi->s_resuid = option;
1565 if (match_int(&args[0], &option))
1567 sbi->s_resgid = option;
1570 /* handled by get_sb_block() instead of here */
1571 /* *sb_block = match_int(&args[0]); */
1574 clear_opt(sb, ERRORS_CONT);
1575 clear_opt(sb, ERRORS_RO);
1576 set_opt(sb, ERRORS_PANIC);
1579 clear_opt(sb, ERRORS_CONT);
1580 clear_opt(sb, ERRORS_PANIC);
1581 set_opt(sb, ERRORS_RO);
1584 clear_opt(sb, ERRORS_RO);
1585 clear_opt(sb, ERRORS_PANIC);
1586 set_opt(sb, ERRORS_CONT);
1589 set_opt(sb, NO_UID32);
1595 ext4_msg(sb, KERN_WARNING,
1596 "Ignoring deprecated oldalloc option");
1599 ext4_msg(sb, KERN_WARNING,
1600 "Ignoring deprecated orlov option");
1602 #ifdef CONFIG_EXT4_FS_XATTR
1603 case Opt_user_xattr:
1604 set_opt(sb, XATTR_USER);
1606 case Opt_nouser_xattr:
1607 clear_opt(sb, XATTR_USER);
1610 case Opt_user_xattr:
1611 case Opt_nouser_xattr:
1612 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
1615 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1617 set_opt(sb, POSIX_ACL);
1620 clear_opt(sb, POSIX_ACL);
1625 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
1628 case Opt_journal_update:
1630 /* Eventually we will want to be able to create
1631 a journal file here. For now, only allow the
1632 user to specify an existing inode to be the
1635 ext4_msg(sb, KERN_ERR,
1636 "Cannot specify journal on remount");
1639 set_opt(sb, UPDATE_JOURNAL);
1641 case Opt_journal_dev:
1643 ext4_msg(sb, KERN_ERR,
1644 "Cannot specify journal on remount");
1647 if (match_int(&args[0], &option))
1649 *journal_devnum = option;
1651 case Opt_journal_checksum:
1652 set_opt(sb, JOURNAL_CHECKSUM);
1654 case Opt_journal_async_commit:
1655 set_opt(sb, JOURNAL_ASYNC_COMMIT);
1656 set_opt(sb, JOURNAL_CHECKSUM);
1659 set_opt(sb, NOLOAD);
1662 if (match_int(&args[0], &option))
1667 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1668 sbi->s_commit_interval = HZ * option;
1670 case Opt_max_batch_time:
1671 if (match_int(&args[0], &option))
1675 sbi->s_max_batch_time = option;
1677 case Opt_min_batch_time:
1678 if (match_int(&args[0], &option))
1682 sbi->s_min_batch_time = option;
1684 case Opt_data_journal:
1685 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1687 case Opt_data_ordered:
1688 data_opt = EXT4_MOUNT_ORDERED_DATA;
1690 case Opt_data_writeback:
1691 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1694 if (!sbi->s_journal)
1695 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1696 else if (test_opt(sb, DATA_FLAGS) != data_opt) {
1697 ext4_msg(sb, KERN_ERR,
1698 "Cannot change data mode on remount");
1702 clear_opt(sb, DATA_FLAGS);
1703 sbi->s_mount_opt |= data_opt;
1706 case Opt_data_err_abort:
1707 set_opt(sb, DATA_ERR_ABORT);
1709 case Opt_data_err_ignore:
1710 clear_opt(sb, DATA_ERR_ABORT);
1714 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1718 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1721 case Opt_offusrjquota:
1722 if (!clear_qf_name(sb, USRQUOTA))
1725 case Opt_offgrpjquota:
1726 if (!clear_qf_name(sb, GRPQUOTA))
1730 case Opt_jqfmt_vfsold:
1731 qfmt = QFMT_VFS_OLD;
1733 case Opt_jqfmt_vfsv0:
1736 case Opt_jqfmt_vfsv1:
1739 if (sb_any_quota_loaded(sb) &&
1740 sbi->s_jquota_fmt != qfmt) {
1741 ext4_msg(sb, KERN_ERR, "Cannot change "
1742 "journaled quota options when "
1746 sbi->s_jquota_fmt = qfmt;
1751 set_opt(sb, USRQUOTA);
1755 set_opt(sb, GRPQUOTA);
1758 if (sb_any_quota_loaded(sb)) {
1759 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1760 "options when quota turned on");
1763 clear_opt(sb, QUOTA);
1764 clear_opt(sb, USRQUOTA);
1765 clear_opt(sb, GRPQUOTA);
1771 ext4_msg(sb, KERN_ERR,
1772 "quota options not supported");
1776 case Opt_offusrjquota:
1777 case Opt_offgrpjquota:
1778 case Opt_jqfmt_vfsold:
1779 case Opt_jqfmt_vfsv0:
1780 case Opt_jqfmt_vfsv1:
1781 ext4_msg(sb, KERN_ERR,
1782 "journaled quota options not supported");
1788 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1791 clear_opt(sb, BARRIER);
1795 if (match_int(&args[0], &option))
1798 option = 1; /* No argument, default to 1 */
1800 set_opt(sb, BARRIER);
1802 clear_opt(sb, BARRIER);
1808 ext4_msg(sb, KERN_ERR,
1809 "resize option only available "
1813 if (match_int(&args[0], &option) != 0)
1815 *n_blocks_count = option;
1818 ext4_msg(sb, KERN_WARNING,
1819 "Ignoring deprecated nobh option");
1822 ext4_msg(sb, KERN_WARNING,
1823 "Ignoring deprecated bh option");
1826 set_opt(sb, I_VERSION);
1827 sb->s_flags |= MS_I_VERSION;
1829 case Opt_nodelalloc:
1830 clear_opt(sb, DELALLOC);
1831 clear_opt2(sb, EXPLICIT_DELALLOC);
1833 case Opt_mblk_io_submit:
1834 set_opt(sb, MBLK_IO_SUBMIT);
1836 case Opt_nomblk_io_submit:
1837 clear_opt(sb, MBLK_IO_SUBMIT);
1840 if (match_int(&args[0], &option))
1844 sbi->s_stripe = option;
1847 set_opt(sb, DELALLOC);
1848 set_opt2(sb, EXPLICIT_DELALLOC);
1850 case Opt_block_validity:
1851 set_opt(sb, BLOCK_VALIDITY);
1853 case Opt_noblock_validity:
1854 clear_opt(sb, BLOCK_VALIDITY);
1856 case Opt_inode_readahead_blks:
1857 if (match_int(&args[0], &option))
1859 if (option < 0 || option > (1 << 30))
1861 if (option && !is_power_of_2(option)) {
1862 ext4_msg(sb, KERN_ERR,
1863 "EXT4-fs: inode_readahead_blks"
1864 " must be a power of 2");
1867 sbi->s_inode_readahead_blks = option;
1869 case Opt_journal_ioprio:
1870 if (match_int(&args[0], &option))
1872 if (option < 0 || option > 7)
1874 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1877 case Opt_noauto_da_alloc:
1878 set_opt(sb, NO_AUTO_DA_ALLOC);
1880 case Opt_auto_da_alloc:
1882 if (match_int(&args[0], &option))
1885 option = 1; /* No argument, default to 1 */
1887 clear_opt(sb, NO_AUTO_DA_ALLOC);
1889 set_opt(sb,NO_AUTO_DA_ALLOC);
1892 set_opt(sb, DISCARD);
1895 clear_opt(sb, DISCARD);
1897 case Opt_dioread_nolock:
1898 set_opt(sb, DIOREAD_NOLOCK);
1900 case Opt_dioread_lock:
1901 clear_opt(sb, DIOREAD_NOLOCK);
1903 case Opt_init_itable:
1904 set_opt(sb, INIT_INODE_TABLE);
1906 if (match_int(&args[0], &option))
1909 option = EXT4_DEF_LI_WAIT_MULT;
1912 sbi->s_li_wait_mult = option;
1914 case Opt_noinit_itable:
1915 clear_opt(sb, INIT_INODE_TABLE);
1918 ext4_msg(sb, KERN_ERR,
1919 "Unrecognized mount option \"%s\" "
1920 "or missing value", p);
1925 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1926 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1927 clear_opt(sb, USRQUOTA);
1929 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1930 clear_opt(sb, GRPQUOTA);
1932 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1933 ext4_msg(sb, KERN_ERR, "old and new quota "
1938 if (!sbi->s_jquota_fmt) {
1939 ext4_msg(sb, KERN_ERR, "journaled quota format "
1945 if (test_opt(sb, DIOREAD_NOLOCK)) {
1947 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1949 if (blocksize < PAGE_CACHE_SIZE) {
1950 ext4_msg(sb, KERN_ERR, "can't mount with "
1951 "dioread_nolock if block size != PAGE_SIZE");
1958 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1961 struct ext4_sb_info *sbi = EXT4_SB(sb);
1964 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1965 ext4_msg(sb, KERN_ERR, "revision level too high, "
1966 "forcing read-only mode");
1971 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1972 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1973 "running e2fsck is recommended");
1974 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1975 ext4_msg(sb, KERN_WARNING,
1976 "warning: mounting fs with errors, "
1977 "running e2fsck is recommended");
1978 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1979 le16_to_cpu(es->s_mnt_count) >=
1980 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1981 ext4_msg(sb, KERN_WARNING,
1982 "warning: maximal mount count reached, "
1983 "running e2fsck is recommended");
1984 else if (le32_to_cpu(es->s_checkinterval) &&
1985 (le32_to_cpu(es->s_lastcheck) +
1986 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1987 ext4_msg(sb, KERN_WARNING,
1988 "warning: checktime reached, "
1989 "running e2fsck is recommended");
1990 if (!sbi->s_journal)
1991 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1992 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1993 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1994 le16_add_cpu(&es->s_mnt_count, 1);
1995 es->s_mtime = cpu_to_le32(get_seconds());
1996 ext4_update_dynamic_rev(sb);
1998 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2000 ext4_commit_super(sb, 1);
2002 if (test_opt(sb, DEBUG))
2003 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
2004 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2006 sbi->s_groups_count,
2007 EXT4_BLOCKS_PER_GROUP(sb),
2008 EXT4_INODES_PER_GROUP(sb),
2009 sbi->s_mount_opt, sbi->s_mount_opt2);
2011 cleancache_init_fs(sb);
2015 static int ext4_fill_flex_info(struct super_block *sb)
2017 struct ext4_sb_info *sbi = EXT4_SB(sb);
2018 struct ext4_group_desc *gdp = NULL;
2019 ext4_group_t flex_group_count;
2020 ext4_group_t flex_group;
2021 unsigned int groups_per_flex = 0;
2025 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2026 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2027 sbi->s_log_groups_per_flex = 0;
2030 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
2032 /* We allocate both existing and potentially added groups */
2033 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
2034 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
2035 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
2036 size = flex_group_count * sizeof(struct flex_groups);
2037 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
2038 if (sbi->s_flex_groups == NULL) {
2039 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
2044 for (i = 0; i < sbi->s_groups_count; i++) {
2045 gdp = ext4_get_group_desc(sb, i, NULL);
2047 flex_group = ext4_flex_group(sbi, i);
2048 atomic_add(ext4_free_inodes_count(sb, gdp),
2049 &sbi->s_flex_groups[flex_group].free_inodes);
2050 atomic64_add(ext4_free_group_clusters(sb, gdp),
2051 &sbi->s_flex_groups[flex_group].free_clusters);
2052 atomic_add(ext4_used_dirs_count(sb, gdp),
2053 &sbi->s_flex_groups[flex_group].used_dirs);
2061 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2062 struct ext4_group_desc *gdp)
2066 if (sbi->s_es->s_feature_ro_compat &
2067 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
2068 int offset = offsetof(struct ext4_group_desc, bg_checksum);
2069 __le32 le_group = cpu_to_le32(block_group);
2071 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2072 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2073 crc = crc16(crc, (__u8 *)gdp, offset);
2074 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2075 /* for checksum of struct ext4_group_desc do the rest...*/
2076 if ((sbi->s_es->s_feature_incompat &
2077 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2078 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2079 crc = crc16(crc, (__u8 *)gdp + offset,
2080 le16_to_cpu(sbi->s_es->s_desc_size) -
2084 return cpu_to_le16(crc);
2087 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
2088 struct ext4_group_desc *gdp)
2090 if ((sbi->s_es->s_feature_ro_compat &
2091 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
2092 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
2098 /* Called at mount-time, super-block is locked */
2099 static int ext4_check_descriptors(struct super_block *sb,
2100 ext4_group_t *first_not_zeroed)
2102 struct ext4_sb_info *sbi = EXT4_SB(sb);
2103 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2104 ext4_fsblk_t last_block;
2105 ext4_fsblk_t block_bitmap;
2106 ext4_fsblk_t inode_bitmap;
2107 ext4_fsblk_t inode_table;
2108 int flexbg_flag = 0;
2109 ext4_group_t i, grp = sbi->s_groups_count;
2111 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2114 ext4_debug("Checking group descriptors");
2116 for (i = 0; i < sbi->s_groups_count; i++) {
2117 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2119 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2120 last_block = ext4_blocks_count(sbi->s_es) - 1;
2122 last_block = first_block +
2123 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2125 if ((grp == sbi->s_groups_count) &&
2126 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2129 block_bitmap = ext4_block_bitmap(sb, gdp);
2130 if (block_bitmap < first_block || block_bitmap > last_block) {
2131 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2132 "Block bitmap for group %u not in group "
2133 "(block %llu)!", i, block_bitmap);
2136 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2137 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2138 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2139 "Inode bitmap for group %u not in group "
2140 "(block %llu)!", i, inode_bitmap);
2143 inode_table = ext4_inode_table(sb, gdp);
2144 if (inode_table < first_block ||
2145 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2146 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2147 "Inode table for group %u not in group "
2148 "(block %llu)!", i, inode_table);
2151 ext4_lock_group(sb, i);
2152 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
2153 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2154 "Checksum for group %u failed (%u!=%u)",
2155 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2156 gdp)), le16_to_cpu(gdp->bg_checksum));
2157 if (!(sb->s_flags & MS_RDONLY)) {
2158 ext4_unlock_group(sb, i);
2162 ext4_unlock_group(sb, i);
2164 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2166 if (NULL != first_not_zeroed)
2167 *first_not_zeroed = grp;
2169 ext4_free_blocks_count_set(sbi->s_es,
2170 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2171 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2175 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2176 * the superblock) which were deleted from all directories, but held open by
2177 * a process at the time of a crash. We walk the list and try to delete these
2178 * inodes at recovery time (only with a read-write filesystem).
2180 * In order to keep the orphan inode chain consistent during traversal (in
2181 * case of crash during recovery), we link each inode into the superblock
2182 * orphan list_head and handle it the same way as an inode deletion during
2183 * normal operation (which journals the operations for us).
2185 * We only do an iget() and an iput() on each inode, which is very safe if we
2186 * accidentally point at an in-use or already deleted inode. The worst that
2187 * can happen in this case is that we get a "bit already cleared" message from
2188 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2189 * e2fsck was run on this filesystem, and it must have already done the orphan
2190 * inode cleanup for us, so we can safely abort without any further action.
2192 static void ext4_orphan_cleanup(struct super_block *sb,
2193 struct ext4_super_block *es)
2195 unsigned int s_flags = sb->s_flags;
2196 int nr_orphans = 0, nr_truncates = 0;
2200 if (!es->s_last_orphan) {
2201 jbd_debug(4, "no orphan inodes to clean up\n");
2205 if (bdev_read_only(sb->s_bdev)) {
2206 ext4_msg(sb, KERN_ERR, "write access "
2207 "unavailable, skipping orphan cleanup");
2211 /* Check if feature set would not allow a r/w mount */
2212 if (!ext4_feature_set_ok(sb, 0)) {
2213 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2214 "unknown ROCOMPAT features");
2218 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2219 if (es->s_last_orphan)
2220 jbd_debug(1, "Errors on filesystem, "
2221 "clearing orphan list.\n");
2222 es->s_last_orphan = 0;
2223 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2227 if (s_flags & MS_RDONLY) {
2228 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2229 sb->s_flags &= ~MS_RDONLY;
2232 /* Needed for iput() to work correctly and not trash data */
2233 sb->s_flags |= MS_ACTIVE;
2234 /* Turn on quotas so that they are updated correctly */
2235 for (i = 0; i < MAXQUOTAS; i++) {
2236 if (EXT4_SB(sb)->s_qf_names[i]) {
2237 int ret = ext4_quota_on_mount(sb, i);
2239 ext4_msg(sb, KERN_ERR,
2240 "Cannot turn on journaled "
2241 "quota: error %d", ret);
2246 while (es->s_last_orphan) {
2247 struct inode *inode;
2249 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2250 if (IS_ERR(inode)) {
2251 es->s_last_orphan = 0;
2255 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2256 dquot_initialize(inode);
2257 if (inode->i_nlink) {
2258 ext4_msg(sb, KERN_DEBUG,
2259 "%s: truncating inode %lu to %lld bytes",
2260 __func__, inode->i_ino, inode->i_size);
2261 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2262 inode->i_ino, inode->i_size);
2263 mutex_lock(&inode->i_mutex);
2264 ext4_truncate(inode);
2265 mutex_unlock(&inode->i_mutex);
2268 ext4_msg(sb, KERN_DEBUG,
2269 "%s: deleting unreferenced inode %lu",
2270 __func__, inode->i_ino);
2271 jbd_debug(2, "deleting unreferenced inode %lu\n",
2275 iput(inode); /* The delete magic happens here! */
2278 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2281 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2282 PLURAL(nr_orphans));
2284 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2285 PLURAL(nr_truncates));
2287 /* Turn quotas off */
2288 for (i = 0; i < MAXQUOTAS; i++) {
2289 if (sb_dqopt(sb)->files[i])
2290 dquot_quota_off(sb, i);
2293 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2297 * Maximal extent format file size.
2298 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2299 * extent format containers, within a sector_t, and within i_blocks
2300 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2301 * so that won't be a limiting factor.
2303 * However there is other limiting factor. We do store extents in the form
2304 * of starting block and length, hence the resulting length of the extent
2305 * covering maximum file size must fit into on-disk format containers as
2306 * well. Given that length is always by 1 unit bigger than max unit (because
2307 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2309 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2311 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2314 loff_t upper_limit = MAX_LFS_FILESIZE;
2316 /* small i_blocks in vfs inode? */
2317 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2319 * CONFIG_LBDAF is not enabled implies the inode
2320 * i_block represent total blocks in 512 bytes
2321 * 32 == size of vfs inode i_blocks * 8
2323 upper_limit = (1LL << 32) - 1;
2325 /* total blocks in file system block size */
2326 upper_limit >>= (blkbits - 9);
2327 upper_limit <<= blkbits;
2331 * 32-bit extent-start container, ee_block. We lower the maxbytes
2332 * by one fs block, so ee_len can cover the extent of maximum file
2335 res = (1LL << 32) - 1;
2338 /* Sanity check against vm- & vfs- imposed limits */
2339 if (res > upper_limit)
2346 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2347 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2348 * We need to be 1 filesystem block less than the 2^48 sector limit.
2350 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2352 loff_t res = EXT4_NDIR_BLOCKS;
2355 /* This is calculated to be the largest file size for a dense, block
2356 * mapped file such that the file's total number of 512-byte sectors,
2357 * including data and all indirect blocks, does not exceed (2^48 - 1).
2359 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2360 * number of 512-byte sectors of the file.
2363 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2365 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2366 * the inode i_block field represents total file blocks in
2367 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2369 upper_limit = (1LL << 32) - 1;
2371 /* total blocks in file system block size */
2372 upper_limit >>= (bits - 9);
2376 * We use 48 bit ext4_inode i_blocks
2377 * With EXT4_HUGE_FILE_FL set the i_blocks
2378 * represent total number of blocks in
2379 * file system block size
2381 upper_limit = (1LL << 48) - 1;
2385 /* indirect blocks */
2387 /* double indirect blocks */
2388 meta_blocks += 1 + (1LL << (bits-2));
2389 /* tripple indirect blocks */
2390 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2392 upper_limit -= meta_blocks;
2393 upper_limit <<= bits;
2395 res += 1LL << (bits-2);
2396 res += 1LL << (2*(bits-2));
2397 res += 1LL << (3*(bits-2));
2399 if (res > upper_limit)
2402 if (res > MAX_LFS_FILESIZE)
2403 res = MAX_LFS_FILESIZE;
2408 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2409 ext4_fsblk_t logical_sb_block, int nr)
2411 struct ext4_sb_info *sbi = EXT4_SB(sb);
2412 ext4_group_t bg, first_meta_bg;
2415 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2417 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2419 return logical_sb_block + nr + 1;
2420 bg = sbi->s_desc_per_block * nr;
2421 if (ext4_bg_has_super(sb, bg))
2424 return (has_super + ext4_group_first_block_no(sb, bg));
2428 * ext4_get_stripe_size: Get the stripe size.
2429 * @sbi: In memory super block info
2431 * If we have specified it via mount option, then
2432 * use the mount option value. If the value specified at mount time is
2433 * greater than the blocks per group use the super block value.
2434 * If the super block value is greater than blocks per group return 0.
2435 * Allocator needs it be less than blocks per group.
2438 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2440 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2441 unsigned long stripe_width =
2442 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2445 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2446 ret = sbi->s_stripe;
2447 else if (stripe_width <= sbi->s_blocks_per_group)
2449 else if (stride <= sbi->s_blocks_per_group)
2455 * If the stripe width is 1, this makes no sense and
2456 * we set it to 0 to turn off stripe handling code.
2467 struct attribute attr;
2468 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2469 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2470 const char *, size_t);
2474 static int parse_strtoul(const char *buf,
2475 unsigned long max, unsigned long *value)
2479 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2480 endp = skip_spaces(endp);
2481 if (*endp || *value > max)
2487 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2488 struct ext4_sb_info *sbi,
2491 return snprintf(buf, PAGE_SIZE, "%llu\n",
2493 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
2496 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2497 struct ext4_sb_info *sbi, char *buf)
2499 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2501 if (!sb->s_bdev->bd_part)
2502 return snprintf(buf, PAGE_SIZE, "0\n");
2503 return snprintf(buf, PAGE_SIZE, "%lu\n",
2504 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2505 sbi->s_sectors_written_start) >> 1);
2508 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2509 struct ext4_sb_info *sbi, char *buf)
2511 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2513 if (!sb->s_bdev->bd_part)
2514 return snprintf(buf, PAGE_SIZE, "0\n");
2515 return snprintf(buf, PAGE_SIZE, "%llu\n",
2516 (unsigned long long)(sbi->s_kbytes_written +
2517 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2518 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2521 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2522 struct ext4_sb_info *sbi,
2523 const char *buf, size_t count)
2527 if (parse_strtoul(buf, 0x40000000, &t))
2530 if (t && !is_power_of_2(t))
2533 sbi->s_inode_readahead_blks = t;
2537 static ssize_t sbi_ui_show(struct ext4_attr *a,
2538 struct ext4_sb_info *sbi, char *buf)
2540 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2542 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2545 static ssize_t sbi_ui_store(struct ext4_attr *a,
2546 struct ext4_sb_info *sbi,
2547 const char *buf, size_t count)
2549 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2552 if (parse_strtoul(buf, 0xffffffff, &t))
2558 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2559 static struct ext4_attr ext4_attr_##_name = { \
2560 .attr = {.name = __stringify(_name), .mode = _mode }, \
2563 .offset = offsetof(struct ext4_sb_info, _elname), \
2565 #define EXT4_ATTR(name, mode, show, store) \
2566 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2568 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2569 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2570 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2571 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2572 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2573 #define ATTR_LIST(name) &ext4_attr_##name.attr
2575 EXT4_RO_ATTR(delayed_allocation_blocks);
2576 EXT4_RO_ATTR(session_write_kbytes);
2577 EXT4_RO_ATTR(lifetime_write_kbytes);
2578 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2579 inode_readahead_blks_store, s_inode_readahead_blks);
2580 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2581 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2582 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2583 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2584 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2585 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2586 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2587 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2589 static struct attribute *ext4_attrs[] = {
2590 ATTR_LIST(delayed_allocation_blocks),
2591 ATTR_LIST(session_write_kbytes),
2592 ATTR_LIST(lifetime_write_kbytes),
2593 ATTR_LIST(inode_readahead_blks),
2594 ATTR_LIST(inode_goal),
2595 ATTR_LIST(mb_stats),
2596 ATTR_LIST(mb_max_to_scan),
2597 ATTR_LIST(mb_min_to_scan),
2598 ATTR_LIST(mb_order2_req),
2599 ATTR_LIST(mb_stream_req),
2600 ATTR_LIST(mb_group_prealloc),
2601 ATTR_LIST(max_writeback_mb_bump),
2605 /* Features this copy of ext4 supports */
2606 EXT4_INFO_ATTR(lazy_itable_init);
2607 EXT4_INFO_ATTR(batched_discard);
2609 static struct attribute *ext4_feat_attrs[] = {
2610 ATTR_LIST(lazy_itable_init),
2611 ATTR_LIST(batched_discard),
2615 static ssize_t ext4_attr_show(struct kobject *kobj,
2616 struct attribute *attr, char *buf)
2618 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2620 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2622 return a->show ? a->show(a, sbi, buf) : 0;
2625 static ssize_t ext4_attr_store(struct kobject *kobj,
2626 struct attribute *attr,
2627 const char *buf, size_t len)
2629 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2631 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2633 return a->store ? a->store(a, sbi, buf, len) : 0;
2636 static void ext4_sb_release(struct kobject *kobj)
2638 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2640 complete(&sbi->s_kobj_unregister);
2643 static const struct sysfs_ops ext4_attr_ops = {
2644 .show = ext4_attr_show,
2645 .store = ext4_attr_store,
2648 static struct kobj_type ext4_ktype = {
2649 .default_attrs = ext4_attrs,
2650 .sysfs_ops = &ext4_attr_ops,
2651 .release = ext4_sb_release,
2654 static void ext4_feat_release(struct kobject *kobj)
2656 complete(&ext4_feat->f_kobj_unregister);
2659 static struct kobj_type ext4_feat_ktype = {
2660 .default_attrs = ext4_feat_attrs,
2661 .sysfs_ops = &ext4_attr_ops,
2662 .release = ext4_feat_release,
2666 * Check whether this filesystem can be mounted based on
2667 * the features present and the RDONLY/RDWR mount requested.
2668 * Returns 1 if this filesystem can be mounted as requested,
2669 * 0 if it cannot be.
2671 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2673 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2674 ext4_msg(sb, KERN_ERR,
2675 "Couldn't mount because of "
2676 "unsupported optional features (%x)",
2677 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2678 ~EXT4_FEATURE_INCOMPAT_SUPP));
2685 /* Check that feature set is OK for a read-write mount */
2686 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2687 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2688 "unsupported optional features (%x)",
2689 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2690 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2694 * Large file size enabled file system can only be mounted
2695 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2697 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2698 if (sizeof(blkcnt_t) < sizeof(u64)) {
2699 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2700 "cannot be mounted RDWR without "
2705 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2706 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2707 ext4_msg(sb, KERN_ERR,
2708 "Can't support bigalloc feature without "
2709 "extents feature\n");
2716 * This function is called once a day if we have errors logged
2717 * on the file system
2719 static void print_daily_error_info(unsigned long arg)
2721 struct super_block *sb = (struct super_block *) arg;
2722 struct ext4_sb_info *sbi;
2723 struct ext4_super_block *es;
2728 if (es->s_error_count)
2729 /* fsck newer than v1.41.13 is needed to clean this condition. */
2730 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2731 le32_to_cpu(es->s_error_count));
2732 if (es->s_first_error_time) {
2733 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2734 sb->s_id, le32_to_cpu(es->s_first_error_time),
2735 (int) sizeof(es->s_first_error_func),
2736 es->s_first_error_func,
2737 le32_to_cpu(es->s_first_error_line));
2738 if (es->s_first_error_ino)
2739 printk(": inode %u",
2740 le32_to_cpu(es->s_first_error_ino));
2741 if (es->s_first_error_block)
2742 printk(": block %llu", (unsigned long long)
2743 le64_to_cpu(es->s_first_error_block));
2746 if (es->s_last_error_time) {
2747 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2748 sb->s_id, le32_to_cpu(es->s_last_error_time),
2749 (int) sizeof(es->s_last_error_func),
2750 es->s_last_error_func,
2751 le32_to_cpu(es->s_last_error_line));
2752 if (es->s_last_error_ino)
2753 printk(": inode %u",
2754 le32_to_cpu(es->s_last_error_ino));
2755 if (es->s_last_error_block)
2756 printk(": block %llu", (unsigned long long)
2757 le64_to_cpu(es->s_last_error_block));
2760 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2763 /* Find next suitable group and run ext4_init_inode_table */
2764 static int ext4_run_li_request(struct ext4_li_request *elr)
2766 struct ext4_group_desc *gdp = NULL;
2767 ext4_group_t group, ngroups;
2768 struct super_block *sb;
2769 unsigned long timeout = 0;
2773 ngroups = EXT4_SB(sb)->s_groups_count;
2775 for (group = elr->lr_next_group; group < ngroups; group++) {
2776 gdp = ext4_get_group_desc(sb, group, NULL);
2782 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2786 if (group == ngroups)
2791 ret = ext4_init_inode_table(sb, group,
2792 elr->lr_timeout ? 0 : 1);
2793 if (elr->lr_timeout == 0) {
2794 timeout = (jiffies - timeout) *
2795 elr->lr_sbi->s_li_wait_mult;
2796 elr->lr_timeout = timeout;
2798 elr->lr_next_sched = jiffies + elr->lr_timeout;
2799 elr->lr_next_group = group + 1;
2806 * Remove lr_request from the list_request and free the
2807 * request structure. Should be called with li_list_mtx held
2809 static void ext4_remove_li_request(struct ext4_li_request *elr)
2811 struct ext4_sb_info *sbi;
2818 list_del(&elr->lr_request);
2819 sbi->s_li_request = NULL;
2823 static void ext4_unregister_li_request(struct super_block *sb)
2825 mutex_lock(&ext4_li_mtx);
2826 if (!ext4_li_info) {
2827 mutex_unlock(&ext4_li_mtx);
2831 mutex_lock(&ext4_li_info->li_list_mtx);
2832 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2833 mutex_unlock(&ext4_li_info->li_list_mtx);
2834 mutex_unlock(&ext4_li_mtx);
2837 static struct task_struct *ext4_lazyinit_task;
2840 * This is the function where ext4lazyinit thread lives. It walks
2841 * through the request list searching for next scheduled filesystem.
2842 * When such a fs is found, run the lazy initialization request
2843 * (ext4_rn_li_request) and keep track of the time spend in this
2844 * function. Based on that time we compute next schedule time of
2845 * the request. When walking through the list is complete, compute
2846 * next waking time and put itself into sleep.
2848 static int ext4_lazyinit_thread(void *arg)
2850 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2851 struct list_head *pos, *n;
2852 struct ext4_li_request *elr;
2853 unsigned long next_wakeup, cur;
2855 BUG_ON(NULL == eli);
2859 next_wakeup = MAX_JIFFY_OFFSET;
2861 mutex_lock(&eli->li_list_mtx);
2862 if (list_empty(&eli->li_request_list)) {
2863 mutex_unlock(&eli->li_list_mtx);
2867 list_for_each_safe(pos, n, &eli->li_request_list) {
2868 elr = list_entry(pos, struct ext4_li_request,
2871 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2872 if (ext4_run_li_request(elr) != 0) {
2873 /* error, remove the lazy_init job */
2874 ext4_remove_li_request(elr);
2879 if (time_before(elr->lr_next_sched, next_wakeup))
2880 next_wakeup = elr->lr_next_sched;
2882 mutex_unlock(&eli->li_list_mtx);
2884 if (freezing(current))
2888 if ((time_after_eq(cur, next_wakeup)) ||
2889 (MAX_JIFFY_OFFSET == next_wakeup)) {
2894 schedule_timeout_interruptible(next_wakeup - cur);
2896 if (kthread_should_stop()) {
2897 ext4_clear_request_list();
2904 * It looks like the request list is empty, but we need
2905 * to check it under the li_list_mtx lock, to prevent any
2906 * additions into it, and of course we should lock ext4_li_mtx
2907 * to atomically free the list and ext4_li_info, because at
2908 * this point another ext4 filesystem could be registering
2911 mutex_lock(&ext4_li_mtx);
2912 mutex_lock(&eli->li_list_mtx);
2913 if (!list_empty(&eli->li_request_list)) {
2914 mutex_unlock(&eli->li_list_mtx);
2915 mutex_unlock(&ext4_li_mtx);
2918 mutex_unlock(&eli->li_list_mtx);
2919 kfree(ext4_li_info);
2920 ext4_li_info = NULL;
2921 mutex_unlock(&ext4_li_mtx);
2926 static void ext4_clear_request_list(void)
2928 struct list_head *pos, *n;
2929 struct ext4_li_request *elr;
2931 mutex_lock(&ext4_li_info->li_list_mtx);
2932 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2933 elr = list_entry(pos, struct ext4_li_request,
2935 ext4_remove_li_request(elr);
2937 mutex_unlock(&ext4_li_info->li_list_mtx);
2940 static int ext4_run_lazyinit_thread(void)
2942 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2943 ext4_li_info, "ext4lazyinit");
2944 if (IS_ERR(ext4_lazyinit_task)) {
2945 int err = PTR_ERR(ext4_lazyinit_task);
2946 ext4_clear_request_list();
2947 kfree(ext4_li_info);
2948 ext4_li_info = NULL;
2949 printk(KERN_CRIT "EXT4: error %d creating inode table "
2950 "initialization thread\n",
2954 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2959 * Check whether it make sense to run itable init. thread or not.
2960 * If there is at least one uninitialized inode table, return
2961 * corresponding group number, else the loop goes through all
2962 * groups and return total number of groups.
2964 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2966 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2967 struct ext4_group_desc *gdp = NULL;
2969 for (group = 0; group < ngroups; group++) {
2970 gdp = ext4_get_group_desc(sb, group, NULL);
2974 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2981 static int ext4_li_info_new(void)
2983 struct ext4_lazy_init *eli = NULL;
2985 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2989 INIT_LIST_HEAD(&eli->li_request_list);
2990 mutex_init(&eli->li_list_mtx);
2992 eli->li_state |= EXT4_LAZYINIT_QUIT;
2999 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3002 struct ext4_sb_info *sbi = EXT4_SB(sb);
3003 struct ext4_li_request *elr;
3006 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3012 elr->lr_next_group = start;
3015 * Randomize first schedule time of the request to
3016 * spread the inode table initialization requests
3019 get_random_bytes(&rnd, sizeof(rnd));
3020 elr->lr_next_sched = jiffies + (unsigned long)rnd %
3021 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
3026 static int ext4_register_li_request(struct super_block *sb,
3027 ext4_group_t first_not_zeroed)
3029 struct ext4_sb_info *sbi = EXT4_SB(sb);
3030 struct ext4_li_request *elr;
3031 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3034 if (sbi->s_li_request != NULL) {
3036 * Reset timeout so it can be computed again, because
3037 * s_li_wait_mult might have changed.
3039 sbi->s_li_request->lr_timeout = 0;
3043 if (first_not_zeroed == ngroups ||
3044 (sb->s_flags & MS_RDONLY) ||
3045 !test_opt(sb, INIT_INODE_TABLE))
3048 elr = ext4_li_request_new(sb, first_not_zeroed);
3052 mutex_lock(&ext4_li_mtx);
3054 if (NULL == ext4_li_info) {
3055 ret = ext4_li_info_new();
3060 mutex_lock(&ext4_li_info->li_list_mtx);
3061 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3062 mutex_unlock(&ext4_li_info->li_list_mtx);
3064 sbi->s_li_request = elr;
3066 * set elr to NULL here since it has been inserted to
3067 * the request_list and the removal and free of it is
3068 * handled by ext4_clear_request_list from now on.
3072 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3073 ret = ext4_run_lazyinit_thread();
3078 mutex_unlock(&ext4_li_mtx);
3085 * We do not need to lock anything since this is called on
3088 static void ext4_destroy_lazyinit_thread(void)
3091 * If thread exited earlier
3092 * there's nothing to be done.
3094 if (!ext4_li_info || !ext4_lazyinit_task)
3097 kthread_stop(ext4_lazyinit_task);
3101 * Note: calculating the overhead so we can be compatible with
3102 * historical BSD practice is quite difficult in the face of
3103 * clusters/bigalloc. This is because multiple metadata blocks from
3104 * different block group can end up in the same allocation cluster.
3105 * Calculating the exact overhead in the face of clustered allocation
3106 * requires either O(all block bitmaps) in memory or O(number of block
3107 * groups**2) in time. We will still calculate the superblock for
3108 * older file systems --- and if we come across with a bigalloc file
3109 * system with zero in s_overhead_clusters the estimate will be close to
3110 * correct especially for very large cluster sizes --- but for newer
3111 * file systems, it's better to calculate this figure once at mkfs
3112 * time, and store it in the superblock. If the superblock value is
3113 * present (even for non-bigalloc file systems), we will use it.
3115 static int count_overhead(struct super_block *sb, ext4_group_t grp,
3118 struct ext4_sb_info *sbi = EXT4_SB(sb);
3119 struct ext4_group_desc *gdp;
3120 ext4_fsblk_t first_block, last_block, b;
3121 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3122 int s, j, count = 0;
3124 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3125 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3126 sbi->s_itb_per_group + 2);
3128 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3129 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3130 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3131 for (i = 0; i < ngroups; i++) {
3132 gdp = ext4_get_group_desc(sb, i, NULL);
3133 b = ext4_block_bitmap(sb, gdp);
3134 if (b >= first_block && b <= last_block) {
3135 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3138 b = ext4_inode_bitmap(sb, gdp);
3139 if (b >= first_block && b <= last_block) {
3140 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3143 b = ext4_inode_table(sb, gdp);
3144 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3145 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3146 int c = EXT4_B2C(sbi, b - first_block);
3147 ext4_set_bit(c, buf);
3153 if (ext4_bg_has_super(sb, grp)) {
3154 ext4_set_bit(s++, buf);
3157 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3158 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3164 return EXT4_CLUSTERS_PER_GROUP(sb) -
3165 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3169 * Compute the overhead and stash it in sbi->s_overhead
3171 int ext4_calculate_overhead(struct super_block *sb)
3173 struct ext4_sb_info *sbi = EXT4_SB(sb);
3174 struct ext4_super_block *es = sbi->s_es;
3175 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3176 ext4_fsblk_t overhead = 0;
3177 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3179 memset(buf, 0, PAGE_SIZE);
3184 * Compute the overhead (FS structures). This is constant
3185 * for a given filesystem unless the number of block groups
3186 * changes so we cache the previous value until it does.
3190 * All of the blocks before first_data_block are overhead
3192 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3195 * Add the overhead found in each block group
3197 for (i = 0; i < ngroups; i++) {
3200 blks = count_overhead(sb, i, buf);
3203 memset(buf, 0, PAGE_SIZE);
3206 sbi->s_overhead = overhead;
3208 free_page((unsigned long) buf);
3212 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3214 char *orig_data = kstrdup(data, GFP_KERNEL);
3215 struct buffer_head *bh;
3216 struct ext4_super_block *es = NULL;
3217 struct ext4_sb_info *sbi;
3219 ext4_fsblk_t sb_block = get_sb_block(&data);
3220 ext4_fsblk_t logical_sb_block;
3221 unsigned long offset = 0;
3222 unsigned long journal_devnum = 0;
3223 unsigned long def_mount_opts;
3228 int blocksize, clustersize;
3229 unsigned int db_count;
3231 int needs_recovery, has_huge_files, has_bigalloc;
3234 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3235 ext4_group_t first_not_zeroed;
3237 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3241 sbi->s_blockgroup_lock =
3242 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3243 if (!sbi->s_blockgroup_lock) {
3247 sb->s_fs_info = sbi;
3248 sbi->s_mount_opt = 0;
3249 sbi->s_resuid = EXT4_DEF_RESUID;
3250 sbi->s_resgid = EXT4_DEF_RESGID;
3251 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3252 sbi->s_sb_block = sb_block;
3253 if (sb->s_bdev->bd_part)
3254 sbi->s_sectors_written_start =
3255 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3257 /* Cleanup superblock name */
3258 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3262 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3264 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3269 * The ext4 superblock will not be buffer aligned for other than 1kB
3270 * block sizes. We need to calculate the offset from buffer start.
3272 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3273 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3274 offset = do_div(logical_sb_block, blocksize);
3276 logical_sb_block = sb_block;
3279 if (!(bh = sb_bread(sb, logical_sb_block))) {
3280 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3284 * Note: s_es must be initialized as soon as possible because
3285 * some ext4 macro-instructions depend on its value
3287 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3289 sb->s_magic = le16_to_cpu(es->s_magic);
3290 if (sb->s_magic != EXT4_SUPER_MAGIC)
3292 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3294 /* Set defaults before we parse the mount options */
3295 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3296 set_opt(sb, INIT_INODE_TABLE);
3297 if (def_mount_opts & EXT4_DEFM_DEBUG)
3299 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
3300 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
3304 if (def_mount_opts & EXT4_DEFM_UID16)
3305 set_opt(sb, NO_UID32);
3306 /* xattr user namespace & acls are now defaulted on */
3307 #ifdef CONFIG_EXT4_FS_XATTR
3308 set_opt(sb, XATTR_USER);
3310 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3311 set_opt(sb, POSIX_ACL);
3313 set_opt(sb, MBLK_IO_SUBMIT);
3314 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3315 set_opt(sb, JOURNAL_DATA);
3316 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3317 set_opt(sb, ORDERED_DATA);
3318 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3319 set_opt(sb, WRITEBACK_DATA);
3321 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3322 set_opt(sb, ERRORS_PANIC);
3323 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3324 set_opt(sb, ERRORS_CONT);
3326 set_opt(sb, ERRORS_RO);
3327 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3328 set_opt(sb, BLOCK_VALIDITY);
3329 if (def_mount_opts & EXT4_DEFM_DISCARD)
3330 set_opt(sb, DISCARD);
3332 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3333 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
3334 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3335 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3336 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3338 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3339 set_opt(sb, BARRIER);
3342 * enable delayed allocation by default
3343 * Use -o nodelalloc to turn it off
3345 if (!IS_EXT3_SB(sb) &&
3346 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3347 set_opt(sb, DELALLOC);
3350 * set default s_li_wait_mult for lazyinit, for the case there is
3351 * no mount option specified.
3353 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3355 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3356 &journal_devnum, &journal_ioprio, NULL, 0)) {
3357 ext4_msg(sb, KERN_WARNING,
3358 "failed to parse options in superblock: %s",
3359 sbi->s_es->s_mount_opts);
3361 if (!parse_options((char *) data, sb, &journal_devnum,
3362 &journal_ioprio, NULL, 0))
3365 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3366 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3367 "with data=journal disables delayed "
3368 "allocation and O_DIRECT support!\n");
3369 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3370 ext4_msg(sb, KERN_ERR, "can't mount with "
3371 "both data=journal and delalloc");
3374 if (test_opt(sb, DIOREAD_NOLOCK)) {
3375 ext4_msg(sb, KERN_ERR, "can't mount with "
3376 "both data=journal and dioread_nolock");
3379 if (test_opt(sb, DELALLOC))
3380 clear_opt(sb, DELALLOC);
3383 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3384 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3386 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3387 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3388 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3389 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3390 ext4_msg(sb, KERN_WARNING,
3391 "feature flags set on rev 0 fs, "
3392 "running e2fsck is recommended");
3394 if (IS_EXT2_SB(sb)) {
3395 if (ext2_feature_set_ok(sb))
3396 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3397 "using the ext4 subsystem");
3399 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3400 "to feature incompatibilities");
3405 if (IS_EXT3_SB(sb)) {
3406 if (ext3_feature_set_ok(sb))
3407 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3408 "using the ext4 subsystem");
3410 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3411 "to feature incompatibilities");
3417 * Check feature flags regardless of the revision level, since we
3418 * previously didn't change the revision level when setting the flags,
3419 * so there is a chance incompat flags are set on a rev 0 filesystem.
3421 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3424 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3425 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3426 blocksize > EXT4_MAX_BLOCK_SIZE) {
3427 ext4_msg(sb, KERN_ERR,
3428 "Unsupported filesystem blocksize %d", blocksize);
3432 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3433 ext4_msg(sb, KERN_ERR,
3434 "Number of reserved GDT blocks insanely large: %d",
3435 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3439 if (sb->s_blocksize != blocksize) {
3440 /* Validate the filesystem blocksize */
3441 if (!sb_set_blocksize(sb, blocksize)) {
3442 ext4_msg(sb, KERN_ERR, "bad block size %d",
3448 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3449 offset = do_div(logical_sb_block, blocksize);
3450 bh = sb_bread(sb, logical_sb_block);
3452 ext4_msg(sb, KERN_ERR,
3453 "Can't read superblock on 2nd try");
3456 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
3458 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3459 ext4_msg(sb, KERN_ERR,
3460 "Magic mismatch, very weird!");
3465 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3466 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3467 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3469 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3471 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3472 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3473 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3475 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3476 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3477 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3478 (!is_power_of_2(sbi->s_inode_size)) ||
3479 (sbi->s_inode_size > blocksize)) {
3480 ext4_msg(sb, KERN_ERR,
3481 "unsupported inode size: %d",
3485 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3486 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3489 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3490 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3491 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3492 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3493 !is_power_of_2(sbi->s_desc_size)) {
3494 ext4_msg(sb, KERN_ERR,
3495 "unsupported descriptor size %lu",
3500 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3502 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3503 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3504 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3507 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3508 if (sbi->s_inodes_per_block == 0)
3510 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3511 sbi->s_inodes_per_block;
3512 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3514 sbi->s_mount_state = le16_to_cpu(es->s_state);
3515 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3516 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3518 for (i = 0; i < 4; i++)
3519 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3520 sbi->s_def_hash_version = es->s_def_hash_version;
3521 i = le32_to_cpu(es->s_flags);
3522 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3523 sbi->s_hash_unsigned = 3;
3524 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3525 #ifdef __CHAR_UNSIGNED__
3526 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3527 sbi->s_hash_unsigned = 3;
3529 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3534 /* Handle clustersize */
3535 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3536 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3537 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3539 if (clustersize < blocksize) {
3540 ext4_msg(sb, KERN_ERR,
3541 "cluster size (%d) smaller than "
3542 "block size (%d)", clustersize, blocksize);
3545 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3546 le32_to_cpu(es->s_log_block_size);
3547 sbi->s_clusters_per_group =
3548 le32_to_cpu(es->s_clusters_per_group);
3549 if (sbi->s_clusters_per_group > blocksize * 8) {
3550 ext4_msg(sb, KERN_ERR,
3551 "#clusters per group too big: %lu",
3552 sbi->s_clusters_per_group);
3555 if (sbi->s_blocks_per_group !=
3556 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3557 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3558 "clusters per group (%lu) inconsistent",
3559 sbi->s_blocks_per_group,
3560 sbi->s_clusters_per_group);
3564 if (clustersize != blocksize) {
3565 ext4_warning(sb, "fragment/cluster size (%d) != "
3566 "block size (%d)", clustersize,
3568 clustersize = blocksize;
3570 if (sbi->s_blocks_per_group > blocksize * 8) {
3571 ext4_msg(sb, KERN_ERR,
3572 "#blocks per group too big: %lu",
3573 sbi->s_blocks_per_group);
3576 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3577 sbi->s_cluster_bits = 0;
3579 sbi->s_cluster_ratio = clustersize / blocksize;
3581 if (sbi->s_inodes_per_group > blocksize * 8) {
3582 ext4_msg(sb, KERN_ERR,
3583 "#inodes per group too big: %lu",
3584 sbi->s_inodes_per_group);
3589 * Test whether we have more sectors than will fit in sector_t,
3590 * and whether the max offset is addressable by the page cache.
3592 err = generic_check_addressable(sb->s_blocksize_bits,
3593 ext4_blocks_count(es));
3595 ext4_msg(sb, KERN_ERR, "filesystem"
3596 " too large to mount safely on this system");
3597 if (sizeof(sector_t) < 8)
3598 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3603 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3606 /* check blocks count against device size */
3607 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3608 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3609 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3610 "exceeds size of device (%llu blocks)",
3611 ext4_blocks_count(es), blocks_count);
3616 * It makes no sense for the first data block to be beyond the end
3617 * of the filesystem.
3619 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3620 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
3621 "block %u is beyond end of filesystem (%llu)",
3622 le32_to_cpu(es->s_first_data_block),
3623 ext4_blocks_count(es));
3626 blocks_count = (ext4_blocks_count(es) -
3627 le32_to_cpu(es->s_first_data_block) +
3628 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3629 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3630 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3631 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3632 "(block count %llu, first data block %u, "
3633 "blocks per group %lu)", sbi->s_groups_count,
3634 ext4_blocks_count(es),
3635 le32_to_cpu(es->s_first_data_block),
3636 EXT4_BLOCKS_PER_GROUP(sb));
3639 sbi->s_groups_count = blocks_count;
3640 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3641 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3642 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3643 EXT4_DESC_PER_BLOCK(sb);
3644 sbi->s_group_desc = ext4_kvmalloc(db_count *
3645 sizeof(struct buffer_head *),
3647 if (sbi->s_group_desc == NULL) {
3648 ext4_msg(sb, KERN_ERR, "not enough memory");
3653 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3655 bgl_lock_init(sbi->s_blockgroup_lock);
3657 for (i = 0; i < db_count; i++) {
3658 block = descriptor_loc(sb, logical_sb_block, i);
3659 sbi->s_group_desc[i] = sb_bread(sb, block);
3660 if (!sbi->s_group_desc[i]) {
3661 ext4_msg(sb, KERN_ERR,
3662 "can't read group descriptor %d", i);
3667 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3668 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3671 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3672 if (!ext4_fill_flex_info(sb)) {
3673 ext4_msg(sb, KERN_ERR,
3674 "unable to initialize "
3675 "flex_bg meta info!");
3679 sbi->s_gdb_count = db_count;
3680 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3681 spin_lock_init(&sbi->s_next_gen_lock);
3683 init_timer(&sbi->s_err_report);
3684 sbi->s_err_report.function = print_daily_error_info;
3685 sbi->s_err_report.data = (unsigned long) sb;
3687 err = percpu_counter_init(&sbi->s_freeclusters_counter,
3688 ext4_count_free_clusters(sb));
3690 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3691 ext4_count_free_inodes(sb));
3694 err = percpu_counter_init(&sbi->s_dirs_counter,
3695 ext4_count_dirs(sb));
3698 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
3701 ext4_msg(sb, KERN_ERR, "insufficient memory");
3705 sbi->s_stripe = ext4_get_stripe_size(sbi);
3706 sbi->s_max_writeback_mb_bump = 128;
3709 * set up enough so that it can read an inode
3711 if (!test_opt(sb, NOLOAD) &&
3712 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3713 sb->s_op = &ext4_sops;
3715 sb->s_op = &ext4_nojournal_sops;
3716 sb->s_export_op = &ext4_export_ops;
3717 sb->s_xattr = ext4_xattr_handlers;
3719 sb->s_qcop = &ext4_qctl_operations;
3720 sb->dq_op = &ext4_quota_operations;
3722 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3724 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3725 mutex_init(&sbi->s_orphan_lock);
3726 sbi->s_resize_flags = 0;
3730 needs_recovery = (es->s_last_orphan != 0 ||
3731 EXT4_HAS_INCOMPAT_FEATURE(sb,
3732 EXT4_FEATURE_INCOMPAT_RECOVER));
3734 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3735 !(sb->s_flags & MS_RDONLY))
3736 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3740 * The first inode we look at is the journal inode. Don't try
3741 * root first: it may be modified in the journal!
3743 if (!test_opt(sb, NOLOAD) &&
3744 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3745 if (ext4_load_journal(sb, es, journal_devnum))
3747 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3748 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3749 ext4_msg(sb, KERN_ERR, "required journal recovery "
3750 "suppressed and not mounted read-only");
3751 goto failed_mount_wq;
3753 clear_opt(sb, DATA_FLAGS);
3754 sbi->s_journal = NULL;
3759 if (ext4_blocks_count(es) > 0xffffffffULL &&
3760 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3761 JBD2_FEATURE_INCOMPAT_64BIT)) {
3762 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3763 goto failed_mount_wq;
3766 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3767 jbd2_journal_set_features(sbi->s_journal,
3768 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3769 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3770 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3771 jbd2_journal_set_features(sbi->s_journal,
3772 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
3773 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3774 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3776 jbd2_journal_clear_features(sbi->s_journal,
3777 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3778 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3781 /* We have now updated the journal if required, so we can
3782 * validate the data journaling mode. */
3783 switch (test_opt(sb, DATA_FLAGS)) {
3785 /* No mode set, assume a default based on the journal
3786 * capabilities: ORDERED_DATA if the journal can
3787 * cope, else JOURNAL_DATA
3789 if (jbd2_journal_check_available_features
3790 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3791 set_opt(sb, ORDERED_DATA);
3793 set_opt(sb, JOURNAL_DATA);
3796 case EXT4_MOUNT_ORDERED_DATA:
3797 case EXT4_MOUNT_WRITEBACK_DATA:
3798 if (!jbd2_journal_check_available_features
3799 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3800 ext4_msg(sb, KERN_ERR, "Journal does not support "
3801 "requested data journaling mode");
3802 goto failed_mount_wq;
3807 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3810 * The journal may have updated the bg summary counts, so we
3811 * need to update the global counters.
3813 percpu_counter_set(&sbi->s_freeclusters_counter,
3814 ext4_count_free_clusters(sb));
3815 percpu_counter_set(&sbi->s_freeinodes_counter,
3816 ext4_count_free_inodes(sb));
3817 percpu_counter_set(&sbi->s_dirs_counter,
3818 ext4_count_dirs(sb));
3819 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
3823 * Get the # of file system overhead blocks from the
3824 * superblock if present.
3826 if (es->s_overhead_clusters)
3827 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3829 ret = ext4_calculate_overhead(sb);
3831 goto failed_mount_wq;
3835 * The maximum number of concurrent works can be high and
3836 * concurrency isn't really necessary. Limit it to 1.
3838 EXT4_SB(sb)->dio_unwritten_wq =
3839 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3840 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3841 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3842 goto failed_mount_wq;
3846 * The jbd2_journal_load will have done any necessary log recovery,
3847 * so we can safely mount the rest of the filesystem now.
3850 root = ext4_iget(sb, EXT4_ROOT_INO);
3852 ext4_msg(sb, KERN_ERR, "get root inode failed");
3853 ret = PTR_ERR(root);
3857 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3858 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
3861 sb->s_root = d_alloc_root(root);
3863 ext4_msg(sb, KERN_ERR, "get root dentry failed");
3868 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3869 sb->s_flags |= MS_RDONLY;
3871 /* determine the minimum size of new large inodes, if present */
3872 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3873 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3874 EXT4_GOOD_OLD_INODE_SIZE;
3875 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3876 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3877 if (sbi->s_want_extra_isize <
3878 le16_to_cpu(es->s_want_extra_isize))
3879 sbi->s_want_extra_isize =
3880 le16_to_cpu(es->s_want_extra_isize);
3881 if (sbi->s_want_extra_isize <
3882 le16_to_cpu(es->s_min_extra_isize))
3883 sbi->s_want_extra_isize =
3884 le16_to_cpu(es->s_min_extra_isize);
3887 /* Check if enough inode space is available */
3888 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3889 sbi->s_inode_size) {
3890 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3891 EXT4_GOOD_OLD_INODE_SIZE;
3892 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3896 err = ext4_setup_system_zone(sb);
3898 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3904 err = ext4_mb_init(sb, needs_recovery);
3906 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3911 err = ext4_register_li_request(sb, first_not_zeroed);
3915 sbi->s_kobj.kset = ext4_kset;
3916 init_completion(&sbi->s_kobj_unregister);
3917 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3922 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3923 ext4_orphan_cleanup(sb, es);
3924 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3925 if (needs_recovery) {
3926 ext4_msg(sb, KERN_INFO, "recovery complete");
3927 ext4_mark_recovery_complete(sb, es);
3929 if (EXT4_SB(sb)->s_journal) {
3930 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3931 descr = " journalled data mode";
3932 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3933 descr = " ordered data mode";
3935 descr = " writeback data mode";
3937 descr = "out journal";
3939 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3940 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3941 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
3943 if (es->s_error_count)
3944 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3951 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
3955 ext4_unregister_li_request(sb);
3957 ext4_ext_release(sb);
3959 ext4_mb_release(sb);
3960 ext4_release_system_zone(sb);
3964 ext4_msg(sb, KERN_ERR, "mount failed");
3965 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3967 if (sbi->s_journal) {
3968 jbd2_journal_destroy(sbi->s_journal);
3969 sbi->s_journal = NULL;
3972 del_timer_sync(&sbi->s_err_report);
3973 if (sbi->s_flex_groups)
3974 ext4_kvfree(sbi->s_flex_groups);
3975 percpu_counter_destroy(&sbi->s_freeclusters_counter);
3976 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3977 percpu_counter_destroy(&sbi->s_dirs_counter);
3978 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
3980 kthread_stop(sbi->s_mmp_tsk);
3982 for (i = 0; i < db_count; i++)
3983 brelse(sbi->s_group_desc[i]);
3984 ext4_kvfree(sbi->s_group_desc);
3987 remove_proc_entry(sb->s_id, ext4_proc_root);
3990 for (i = 0; i < MAXQUOTAS; i++)
3991 kfree(sbi->s_qf_names[i]);
3993 ext4_blkdev_remove(sbi);
3996 sb->s_fs_info = NULL;
3997 kfree(sbi->s_blockgroup_lock);
4005 * Setup any per-fs journal parameters now. We'll do this both on
4006 * initial mount, once the journal has been initialised but before we've
4007 * done any recovery; and again on any subsequent remount.
4009 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4011 struct ext4_sb_info *sbi = EXT4_SB(sb);
4013 journal->j_commit_interval = sbi->s_commit_interval;
4014 journal->j_min_batch_time = sbi->s_min_batch_time;
4015 journal->j_max_batch_time = sbi->s_max_batch_time;
4017 write_lock(&journal->j_state_lock);
4018 if (test_opt(sb, BARRIER))
4019 journal->j_flags |= JBD2_BARRIER;
4021 journal->j_flags &= ~JBD2_BARRIER;
4022 if (test_opt(sb, DATA_ERR_ABORT))
4023 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4025 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4026 write_unlock(&journal->j_state_lock);
4029 static journal_t *ext4_get_journal(struct super_block *sb,
4030 unsigned int journal_inum)
4032 struct inode *journal_inode;
4035 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4037 /* First, test for the existence of a valid inode on disk. Bad
4038 * things happen if we iget() an unused inode, as the subsequent
4039 * iput() will try to delete it. */
4041 journal_inode = ext4_iget(sb, journal_inum);
4042 if (IS_ERR(journal_inode)) {
4043 ext4_msg(sb, KERN_ERR, "no journal found");
4046 if (!journal_inode->i_nlink) {
4047 make_bad_inode(journal_inode);
4048 iput(journal_inode);
4049 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4053 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4054 journal_inode, journal_inode->i_size);
4055 if (!S_ISREG(journal_inode->i_mode)) {
4056 ext4_msg(sb, KERN_ERR, "invalid journal inode");
4057 iput(journal_inode);
4061 journal = jbd2_journal_init_inode(journal_inode);
4063 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4064 iput(journal_inode);
4067 journal->j_private = sb;
4068 ext4_init_journal_params(sb, journal);
4072 static journal_t *ext4_get_dev_journal(struct super_block *sb,
4075 struct buffer_head *bh;
4079 int hblock, blocksize;
4080 ext4_fsblk_t sb_block;
4081 unsigned long offset;
4082 struct ext4_super_block *es;
4083 struct block_device *bdev;
4085 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4087 bdev = ext4_blkdev_get(j_dev, sb);
4091 blocksize = sb->s_blocksize;
4092 hblock = bdev_logical_block_size(bdev);
4093 if (blocksize < hblock) {
4094 ext4_msg(sb, KERN_ERR,
4095 "blocksize too small for journal device");
4099 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4100 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4101 set_blocksize(bdev, blocksize);
4102 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4103 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4104 "external journal");
4108 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
4109 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4110 !(le32_to_cpu(es->s_feature_incompat) &
4111 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4112 ext4_msg(sb, KERN_ERR, "external journal has "
4118 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4119 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4124 len = ext4_blocks_count(es);
4125 start = sb_block + 1;
4126 brelse(bh); /* we're done with the superblock */
4128 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4129 start, len, blocksize);
4131 ext4_msg(sb, KERN_ERR, "failed to create device journal");
4134 journal->j_private = sb;
4135 ll_rw_block(READ, 1, &journal->j_sb_buffer);
4136 wait_on_buffer(journal->j_sb_buffer);
4137 if (!buffer_uptodate(journal->j_sb_buffer)) {
4138 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4141 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4142 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4143 "user (unsupported) - %d",
4144 be32_to_cpu(journal->j_superblock->s_nr_users));
4147 EXT4_SB(sb)->journal_bdev = bdev;
4148 ext4_init_journal_params(sb, journal);
4152 jbd2_journal_destroy(journal);
4154 ext4_blkdev_put(bdev);
4158 static int ext4_load_journal(struct super_block *sb,
4159 struct ext4_super_block *es,
4160 unsigned long journal_devnum)
4163 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4166 int really_read_only;
4168 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4170 if (journal_devnum &&
4171 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4172 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4173 "numbers have changed");
4174 journal_dev = new_decode_dev(journal_devnum);
4176 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4178 really_read_only = bdev_read_only(sb->s_bdev);
4181 * Are we loading a blank journal or performing recovery after a
4182 * crash? For recovery, we need to check in advance whether we
4183 * can get read-write access to the device.
4185 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4186 if (sb->s_flags & MS_RDONLY) {
4187 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4188 "required on readonly filesystem");
4189 if (really_read_only) {
4190 ext4_msg(sb, KERN_ERR, "write access "
4191 "unavailable, cannot proceed");
4194 ext4_msg(sb, KERN_INFO, "write access will "
4195 "be enabled during recovery");
4199 if (journal_inum && journal_dev) {
4200 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4201 "and inode journals!");
4206 if (!(journal = ext4_get_journal(sb, journal_inum)))
4209 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4213 if (!(journal->j_flags & JBD2_BARRIER))
4214 ext4_msg(sb, KERN_INFO, "barriers disabled");
4216 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
4217 err = jbd2_journal_update_format(journal);
4219 ext4_msg(sb, KERN_ERR, "error updating journal");
4220 jbd2_journal_destroy(journal);
4225 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4226 err = jbd2_journal_wipe(journal, !really_read_only);
4228 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4230 memcpy(save, ((char *) es) +
4231 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4232 err = jbd2_journal_load(journal);
4234 memcpy(((char *) es) + EXT4_S_ERR_START,
4235 save, EXT4_S_ERR_LEN);
4240 ext4_msg(sb, KERN_ERR, "error loading journal");
4241 jbd2_journal_destroy(journal);
4245 EXT4_SB(sb)->s_journal = journal;
4246 ext4_clear_journal_err(sb, es);
4248 if (!really_read_only && journal_devnum &&
4249 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4250 es->s_journal_dev = cpu_to_le32(journal_devnum);
4252 /* Make sure we flush the recovery flag to disk. */
4253 ext4_commit_super(sb, 1);
4259 static int ext4_commit_super(struct super_block *sb, int sync)
4261 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4262 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4265 if (!sbh || block_device_ejected(sb))
4267 if (buffer_write_io_error(sbh)) {
4269 * Oh, dear. A previous attempt to write the
4270 * superblock failed. This could happen because the
4271 * USB device was yanked out. Or it could happen to
4272 * be a transient write error and maybe the block will
4273 * be remapped. Nothing we can do but to retry the
4274 * write and hope for the best.
4276 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4277 "superblock detected");
4278 clear_buffer_write_io_error(sbh);
4279 set_buffer_uptodate(sbh);
4282 * If the file system is mounted read-only, don't update the
4283 * superblock write time. This avoids updating the superblock
4284 * write time when we are mounting the root file system
4285 * read/only but we need to replay the journal; at that point,
4286 * for people who are east of GMT and who make their clock
4287 * tick in localtime for Windows bug-for-bug compatibility,
4288 * the clock is set in the future, and this will cause e2fsck
4289 * to complain and force a full file system check.
4291 if (!(sb->s_flags & MS_RDONLY))
4292 es->s_wtime = cpu_to_le32(get_seconds());
4293 if (sb->s_bdev->bd_part)
4294 es->s_kbytes_written =
4295 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4296 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4297 EXT4_SB(sb)->s_sectors_written_start) >> 1));
4299 es->s_kbytes_written =
4300 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4301 ext4_free_blocks_count_set(es,
4302 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4303 &EXT4_SB(sb)->s_freeclusters_counter)));
4304 es->s_free_inodes_count =
4305 cpu_to_le32(percpu_counter_sum_positive(
4306 &EXT4_SB(sb)->s_freeinodes_counter));
4308 BUFFER_TRACE(sbh, "marking dirty");
4309 mark_buffer_dirty(sbh);
4311 error = sync_dirty_buffer(sbh);
4315 error = buffer_write_io_error(sbh);
4317 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4319 clear_buffer_write_io_error(sbh);
4320 set_buffer_uptodate(sbh);
4327 * Have we just finished recovery? If so, and if we are mounting (or
4328 * remounting) the filesystem readonly, then we will end up with a
4329 * consistent fs on disk. Record that fact.
4331 static void ext4_mark_recovery_complete(struct super_block *sb,
4332 struct ext4_super_block *es)
4334 journal_t *journal = EXT4_SB(sb)->s_journal;
4336 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4337 BUG_ON(journal != NULL);
4340 jbd2_journal_lock_updates(journal);
4341 if (jbd2_journal_flush(journal) < 0)
4344 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4345 sb->s_flags & MS_RDONLY) {
4346 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4347 ext4_commit_super(sb, 1);
4351 jbd2_journal_unlock_updates(journal);
4355 * If we are mounting (or read-write remounting) a filesystem whose journal
4356 * has recorded an error from a previous lifetime, move that error to the
4357 * main filesystem now.
4359 static void ext4_clear_journal_err(struct super_block *sb,
4360 struct ext4_super_block *es)
4366 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4368 journal = EXT4_SB(sb)->s_journal;
4371 * Now check for any error status which may have been recorded in the
4372 * journal by a prior ext4_error() or ext4_abort()
4375 j_errno = jbd2_journal_errno(journal);
4379 errstr = ext4_decode_error(sb, j_errno, nbuf);
4380 ext4_warning(sb, "Filesystem error recorded "
4381 "from previous mount: %s", errstr);
4382 ext4_warning(sb, "Marking fs in need of filesystem check.");
4384 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4385 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4386 ext4_commit_super(sb, 1);
4388 jbd2_journal_clear_err(journal);
4393 * Force the running and committing transactions to commit,
4394 * and wait on the commit.
4396 int ext4_force_commit(struct super_block *sb)
4401 if (sb->s_flags & MS_RDONLY)
4404 journal = EXT4_SB(sb)->s_journal;
4406 vfs_check_frozen(sb, SB_FREEZE_TRANS);
4407 ret = ext4_journal_force_commit(journal);
4413 static void ext4_write_super(struct super_block *sb)
4416 ext4_commit_super(sb, 1);
4420 static int ext4_sync_fs(struct super_block *sb, int wait)
4424 struct ext4_sb_info *sbi = EXT4_SB(sb);
4426 trace_ext4_sync_fs(sb, wait);
4427 flush_workqueue(sbi->dio_unwritten_wq);
4428 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4430 jbd2_log_wait_commit(sbi->s_journal, target);
4436 * LVM calls this function before a (read-only) snapshot is created. This
4437 * gives us a chance to flush the journal completely and mark the fs clean.
4439 * Note that only this function cannot bring a filesystem to be in a clean
4440 * state independently, because ext4 prevents a new handle from being started
4441 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4444 static int ext4_freeze(struct super_block *sb)
4449 if (sb->s_flags & MS_RDONLY)
4452 journal = EXT4_SB(sb)->s_journal;
4454 /* Now we set up the journal barrier. */
4455 jbd2_journal_lock_updates(journal);
4458 * Don't clear the needs_recovery flag if we failed to flush
4461 error = jbd2_journal_flush(journal);
4465 /* Journal blocked and flushed, clear needs_recovery flag. */
4466 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4467 error = ext4_commit_super(sb, 1);
4469 /* we rely on s_frozen to stop further updates */
4470 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4475 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4476 * flag here, even though the filesystem is not technically dirty yet.
4478 static int ext4_unfreeze(struct super_block *sb)
4480 if (sb->s_flags & MS_RDONLY)
4484 /* Reset the needs_recovery flag before the fs is unlocked. */
4485 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4486 ext4_commit_super(sb, 1);
4492 * Structure to save mount options for ext4_remount's benefit
4494 struct ext4_mount_options {
4495 unsigned long s_mount_opt;
4496 unsigned long s_mount_opt2;
4499 unsigned long s_commit_interval;
4500 u32 s_min_batch_time, s_max_batch_time;
4503 char *s_qf_names[MAXQUOTAS];
4507 static int ext4_remount(struct super_block *sb, int *flags, char *data)
4509 struct ext4_super_block *es;
4510 struct ext4_sb_info *sbi = EXT4_SB(sb);
4511 ext4_fsblk_t n_blocks_count = 0;
4512 unsigned long old_sb_flags;
4513 struct ext4_mount_options old_opts;
4514 int enable_quota = 0;
4516 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4521 char *orig_data = kstrdup(data, GFP_KERNEL);
4523 /* Store the original options */
4525 old_sb_flags = sb->s_flags;
4526 old_opts.s_mount_opt = sbi->s_mount_opt;
4527 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4528 old_opts.s_resuid = sbi->s_resuid;
4529 old_opts.s_resgid = sbi->s_resgid;
4530 old_opts.s_commit_interval = sbi->s_commit_interval;
4531 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4532 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4534 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4535 for (i = 0; i < MAXQUOTAS; i++)
4536 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4538 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4539 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4542 * Allow the "check" option to be passed as a remount option.
4544 if (!parse_options(data, sb, NULL, &journal_ioprio,
4545 &n_blocks_count, 1)) {
4550 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4551 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4552 ext4_msg(sb, KERN_ERR, "can't mount with "
4553 "both data=journal and delalloc");
4557 if (test_opt(sb, DIOREAD_NOLOCK)) {
4558 ext4_msg(sb, KERN_ERR, "can't mount with "
4559 "both data=journal and dioread_nolock");
4565 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4566 ext4_abort(sb, "Abort forced by user");
4568 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4569 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4573 if (sbi->s_journal) {
4574 ext4_init_journal_params(sb, sbi->s_journal);
4575 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4578 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
4579 n_blocks_count > ext4_blocks_count(es)) {
4580 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4585 if (*flags & MS_RDONLY) {
4586 err = dquot_suspend(sb, -1);
4591 * First of all, the unconditional stuff we have to do
4592 * to disable replay of the journal when we next remount
4594 sb->s_flags |= MS_RDONLY;
4597 * OK, test if we are remounting a valid rw partition
4598 * readonly, and if so set the rdonly flag and then
4599 * mark the partition as valid again.
4601 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4602 (sbi->s_mount_state & EXT4_VALID_FS))
4603 es->s_state = cpu_to_le16(sbi->s_mount_state);
4606 ext4_mark_recovery_complete(sb, es);
4608 /* Make sure we can mount this feature set readwrite */
4609 if (!ext4_feature_set_ok(sb, 0)) {
4614 * Make sure the group descriptor checksums
4615 * are sane. If they aren't, refuse to remount r/w.
4617 for (g = 0; g < sbi->s_groups_count; g++) {
4618 struct ext4_group_desc *gdp =
4619 ext4_get_group_desc(sb, g, NULL);
4621 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
4622 ext4_msg(sb, KERN_ERR,
4623 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4624 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4625 le16_to_cpu(gdp->bg_checksum));
4632 * If we have an unprocessed orphan list hanging
4633 * around from a previously readonly bdev mount,
4634 * require a full umount/remount for now.
4636 if (es->s_last_orphan) {
4637 ext4_msg(sb, KERN_WARNING, "Couldn't "
4638 "remount RDWR because of unprocessed "
4639 "orphan inode list. Please "
4640 "umount/remount instead");
4646 * Mounting a RDONLY partition read-write, so reread
4647 * and store the current valid flag. (It may have
4648 * been changed by e2fsck since we originally mounted
4652 ext4_clear_journal_err(sb, es);
4653 sbi->s_mount_state = le16_to_cpu(es->s_state);
4654 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
4656 if (!ext4_setup_super(sb, es, 0))
4657 sb->s_flags &= ~MS_RDONLY;
4658 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4659 EXT4_FEATURE_INCOMPAT_MMP))
4660 if (ext4_multi_mount_protect(sb,
4661 le64_to_cpu(es->s_mmp_block))) {
4670 * Reinitialize lazy itable initialization thread based on
4673 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4674 ext4_unregister_li_request(sb);
4676 ext4_group_t first_not_zeroed;
4677 first_not_zeroed = ext4_has_uninit_itable(sb);
4678 ext4_register_li_request(sb, first_not_zeroed);
4681 ext4_setup_system_zone(sb);
4682 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4683 ext4_commit_super(sb, 1);
4686 /* Release old quota file names */
4687 for (i = 0; i < MAXQUOTAS; i++)
4688 if (old_opts.s_qf_names[i] &&
4689 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4690 kfree(old_opts.s_qf_names[i]);
4694 dquot_resume(sb, -1);
4696 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4701 sb->s_flags = old_sb_flags;
4702 sbi->s_mount_opt = old_opts.s_mount_opt;
4703 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4704 sbi->s_resuid = old_opts.s_resuid;
4705 sbi->s_resgid = old_opts.s_resgid;
4706 sbi->s_commit_interval = old_opts.s_commit_interval;
4707 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4708 sbi->s_max_batch_time = old_opts.s_max_batch_time;
4710 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4711 for (i = 0; i < MAXQUOTAS; i++) {
4712 if (sbi->s_qf_names[i] &&
4713 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4714 kfree(sbi->s_qf_names[i]);
4715 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4723 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4725 struct super_block *sb = dentry->d_sb;
4726 struct ext4_sb_info *sbi = EXT4_SB(sb);
4727 struct ext4_super_block *es = sbi->s_es;
4728 ext4_fsblk_t overhead = 0;
4732 if (!test_opt(sb, MINIX_DF))
4733 overhead = sbi->s_overhead;
4735 buf->f_type = EXT4_SUPER_MAGIC;
4736 buf->f_bsize = sb->s_blocksize;
4737 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, sbi->s_overhead);
4738 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4739 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4740 /* prevent underflow in case that few free space is available */
4741 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
4742 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4743 if (buf->f_bfree < ext4_r_blocks_count(es))
4745 buf->f_files = le32_to_cpu(es->s_inodes_count);
4746 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4747 buf->f_namelen = EXT4_NAME_LEN;
4748 fsid = le64_to_cpup((void *)es->s_uuid) ^
4749 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4750 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4751 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4756 /* Helper function for writing quotas on sync - we need to start transaction
4757 * before quota file is locked for write. Otherwise the are possible deadlocks:
4758 * Process 1 Process 2
4759 * ext4_create() quota_sync()
4760 * jbd2_journal_start() write_dquot()
4761 * dquot_initialize() down(dqio_mutex)
4762 * down(dqio_mutex) jbd2_journal_start()
4768 static inline struct inode *dquot_to_inode(struct dquot *dquot)
4770 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4773 static int ext4_write_dquot(struct dquot *dquot)
4777 struct inode *inode;
4779 inode = dquot_to_inode(dquot);
4780 handle = ext4_journal_start(inode,
4781 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4783 return PTR_ERR(handle);
4784 ret = dquot_commit(dquot);
4785 err = ext4_journal_stop(handle);
4791 static int ext4_acquire_dquot(struct dquot *dquot)
4796 handle = ext4_journal_start(dquot_to_inode(dquot),
4797 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4799 return PTR_ERR(handle);
4800 ret = dquot_acquire(dquot);
4801 err = ext4_journal_stop(handle);
4807 static int ext4_release_dquot(struct dquot *dquot)
4812 handle = ext4_journal_start(dquot_to_inode(dquot),
4813 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
4814 if (IS_ERR(handle)) {
4815 /* Release dquot anyway to avoid endless cycle in dqput() */
4816 dquot_release(dquot);
4817 return PTR_ERR(handle);
4819 ret = dquot_release(dquot);
4820 err = ext4_journal_stop(handle);
4826 static int ext4_mark_dquot_dirty(struct dquot *dquot)
4828 /* Are we journaling quotas? */
4829 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4830 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
4831 dquot_mark_dquot_dirty(dquot);
4832 return ext4_write_dquot(dquot);
4834 return dquot_mark_dquot_dirty(dquot);
4838 static int ext4_write_info(struct super_block *sb, int type)
4843 /* Data block + inode block */
4844 handle = ext4_journal_start(sb->s_root->d_inode, 2);
4846 return PTR_ERR(handle);
4847 ret = dquot_commit_info(sb, type);
4848 err = ext4_journal_stop(handle);
4855 * Turn on quotas during mount time - we need to find
4856 * the quota file and such...
4858 static int ext4_quota_on_mount(struct super_block *sb, int type)
4860 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4861 EXT4_SB(sb)->s_jquota_fmt, type);
4865 * Standard function to be called on quota_on
4867 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
4872 if (!test_opt(sb, QUOTA))
4875 /* Quotafile not on the same filesystem? */
4876 if (path->mnt->mnt_sb != sb)
4878 /* Journaling quota? */
4879 if (EXT4_SB(sb)->s_qf_names[type]) {
4880 /* Quotafile not in fs root? */
4881 if (path->dentry->d_parent != sb->s_root)
4882 ext4_msg(sb, KERN_WARNING,
4883 "Quota file not on filesystem root. "
4884 "Journaled quota will not work");
4888 * When we journal data on quota file, we have to flush journal to see
4889 * all updates to the file when we bypass pagecache...
4891 if (EXT4_SB(sb)->s_journal &&
4892 ext4_should_journal_data(path->dentry->d_inode)) {
4894 * We don't need to lock updates but journal_flush() could
4895 * otherwise be livelocked...
4897 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
4898 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
4899 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4904 return dquot_quota_on(sb, type, format_id, path);
4907 static int ext4_quota_off(struct super_block *sb, int type)
4909 struct inode *inode = sb_dqopt(sb)->files[type];
4912 /* Force all delayed allocation blocks to be allocated.
4913 * Caller already holds s_umount sem */
4914 if (test_opt(sb, DELALLOC))
4915 sync_filesystem(sb);
4920 /* Update modification times of quota files when userspace can
4921 * start looking at them */
4922 handle = ext4_journal_start(inode, 1);
4925 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4926 ext4_mark_inode_dirty(handle, inode);
4927 ext4_journal_stop(handle);
4930 return dquot_quota_off(sb, type);
4933 /* Read data from quotafile - avoid pagecache and such because we cannot afford
4934 * acquiring the locks... As quota files are never truncated and quota code
4935 * itself serializes the operations (and no one else should touch the files)
4936 * we don't have to be afraid of races */
4937 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
4938 size_t len, loff_t off)
4940 struct inode *inode = sb_dqopt(sb)->files[type];
4941 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4943 int offset = off & (sb->s_blocksize - 1);
4946 struct buffer_head *bh;
4947 loff_t i_size = i_size_read(inode);
4951 if (off+len > i_size)
4954 while (toread > 0) {
4955 tocopy = sb->s_blocksize - offset < toread ?
4956 sb->s_blocksize - offset : toread;
4957 bh = ext4_bread(NULL, inode, blk, 0, &err);
4960 if (!bh) /* A hole? */
4961 memset(data, 0, tocopy);
4963 memcpy(data, bh->b_data+offset, tocopy);
4973 /* Write to quotafile (we know the transaction is already started and has
4974 * enough credits) */
4975 static ssize_t ext4_quota_write(struct super_block *sb, int type,
4976 const char *data, size_t len, loff_t off)
4978 struct inode *inode = sb_dqopt(sb)->files[type];
4979 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4981 int offset = off & (sb->s_blocksize - 1);
4982 struct buffer_head *bh;
4983 handle_t *handle = journal_current_handle();
4985 if (EXT4_SB(sb)->s_journal && !handle) {
4986 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4987 " cancelled because transaction is not started",
4988 (unsigned long long)off, (unsigned long long)len);
4992 * Since we account only one data block in transaction credits,
4993 * then it is impossible to cross a block boundary.
4995 if (sb->s_blocksize - offset < len) {
4996 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4997 " cancelled because not block aligned",
4998 (unsigned long long)off, (unsigned long long)len);
5002 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
5003 bh = ext4_bread(handle, inode, blk, 1, &err);
5006 err = ext4_journal_get_write_access(handle, bh);
5012 memcpy(bh->b_data+offset, data, len);
5013 flush_dcache_page(bh->b_page);
5015 err = ext4_handle_dirty_metadata(handle, NULL, bh);
5019 mutex_unlock(&inode->i_mutex);
5022 if (inode->i_size < off + len) {
5023 i_size_write(inode, off + len);
5024 EXT4_I(inode)->i_disksize = inode->i_size;
5025 ext4_mark_inode_dirty(handle, inode);
5027 mutex_unlock(&inode->i_mutex);
5033 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5034 const char *dev_name, void *data)
5036 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5039 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5040 static inline void register_as_ext2(void)
5042 int err = register_filesystem(&ext2_fs_type);
5045 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5048 static inline void unregister_as_ext2(void)
5050 unregister_filesystem(&ext2_fs_type);
5053 static inline int ext2_feature_set_ok(struct super_block *sb)
5055 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5057 if (sb->s_flags & MS_RDONLY)
5059 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5063 MODULE_ALIAS("ext2");
5065 static inline void register_as_ext2(void) { }
5066 static inline void unregister_as_ext2(void) { }
5067 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5070 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5071 static inline void register_as_ext3(void)
5073 int err = register_filesystem(&ext3_fs_type);
5076 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5079 static inline void unregister_as_ext3(void)
5081 unregister_filesystem(&ext3_fs_type);
5084 static inline int ext3_feature_set_ok(struct super_block *sb)
5086 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5088 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5090 if (sb->s_flags & MS_RDONLY)
5092 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5096 MODULE_ALIAS("ext3");
5098 static inline void register_as_ext3(void) { }
5099 static inline void unregister_as_ext3(void) { }
5100 static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
5103 static struct file_system_type ext4_fs_type = {
5104 .owner = THIS_MODULE,
5106 .mount = ext4_mount,
5107 .kill_sb = kill_block_super,
5108 .fs_flags = FS_REQUIRES_DEV,
5111 static int __init ext4_init_feat_adverts(void)
5113 struct ext4_features *ef;
5116 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5120 ef->f_kobj.kset = ext4_kset;
5121 init_completion(&ef->f_kobj_unregister);
5122 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5135 static void ext4_exit_feat_adverts(void)
5137 kobject_put(&ext4_feat->f_kobj);
5138 wait_for_completion(&ext4_feat->f_kobj_unregister);
5142 /* Shared across all ext4 file systems */
5143 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5144 struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5146 static int __init ext4_init_fs(void)
5150 ext4_check_flag_values();
5152 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5153 mutex_init(&ext4__aio_mutex[i]);
5154 init_waitqueue_head(&ext4__ioend_wq[i]);
5157 err = ext4_init_pageio();
5160 err = ext4_init_system_zone();
5163 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5166 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
5168 err = ext4_init_feat_adverts();
5172 err = ext4_init_mballoc();
5176 err = ext4_init_xattr();
5179 err = init_inodecache();
5184 err = register_filesystem(&ext4_fs_type);
5188 ext4_li_info = NULL;
5189 mutex_init(&ext4_li_mtx);
5192 unregister_as_ext2();
5193 unregister_as_ext3();
5194 destroy_inodecache();
5198 ext4_exit_mballoc();
5200 ext4_exit_feat_adverts();
5203 remove_proc_entry("fs/ext4", NULL);
5204 kset_unregister(ext4_kset);
5206 ext4_exit_system_zone();
5212 static void __exit ext4_exit_fs(void)
5214 ext4_destroy_lazyinit_thread();
5215 unregister_as_ext2();
5216 unregister_as_ext3();
5217 unregister_filesystem(&ext4_fs_type);
5218 destroy_inodecache();
5220 ext4_exit_mballoc();
5221 ext4_exit_feat_adverts();
5222 remove_proc_entry("fs/ext4", NULL);
5223 kset_unregister(ext4_kset);
5224 ext4_exit_system_zone();
5228 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5229 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5230 MODULE_LICENSE("GPL");
5231 module_init(ext4_init_fs)
5232 module_exit(ext4_exit_fs)