2 * linux/fs/ext4/super.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/time.h>
23 #include <linux/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/buffer_head.h>
30 #include <linux/exportfs.h>
31 #include <linux/vfs.h>
32 #include <linux/random.h>
33 #include <linux/mount.h>
34 #include <linux/namei.h>
35 #include <linux/quotaops.h>
36 #include <linux/seq_file.h>
37 #include <linux/proc_fs.h>
38 #include <linux/ctype.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <linux/cleancache.h>
42 #include <asm/uaccess.h>
44 #include <linux/kthread.h>
45 #include <linux/freezer.h>
48 #include "ext4_extents.h"
49 #include "ext4_jbd2.h"
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/ext4.h>
57 static struct proc_dir_entry *ext4_proc_root;
58 static struct kset *ext4_kset;
59 static struct ext4_lazy_init *ext4_li_info;
60 static struct mutex ext4_li_mtx;
61 static struct ext4_features *ext4_feat;
63 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
64 unsigned long journal_devnum);
65 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
66 static int ext4_commit_super(struct super_block *sb, int sync);
67 static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69 static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
71 static int ext4_sync_fs(struct super_block *sb, int wait);
72 static const char *ext4_decode_error(struct super_block *sb, int errno,
74 static int ext4_remount(struct super_block *sb, int *flags, char *data);
75 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
76 static int ext4_unfreeze(struct super_block *sb);
77 static void ext4_write_super(struct super_block *sb);
78 static int ext4_freeze(struct super_block *sb);
79 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
80 const char *dev_name, void *data);
81 static inline int ext2_feature_set_ok(struct super_block *sb);
82 static inline int ext3_feature_set_ok(struct super_block *sb);
83 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
84 static void ext4_destroy_lazyinit_thread(void);
85 static void ext4_unregister_li_request(struct super_block *sb);
86 static void ext4_clear_request_list(void);
88 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
89 static struct file_system_type ext2_fs_type = {
93 .kill_sb = kill_block_super,
94 .fs_flags = FS_REQUIRES_DEV,
96 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
98 #define IS_EXT2_SB(sb) (0)
102 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
103 static struct file_system_type ext3_fs_type = {
104 .owner = THIS_MODULE,
107 .kill_sb = kill_block_super,
108 .fs_flags = FS_REQUIRES_DEV,
110 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
112 #define IS_EXT3_SB(sb) (0)
115 void *ext4_kvmalloc(size_t size, gfp_t flags)
119 ret = kmalloc(size, flags);
121 ret = __vmalloc(size, flags, PAGE_KERNEL);
125 void *ext4_kvzalloc(size_t size, gfp_t flags)
129 ret = kzalloc(size, flags);
131 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
135 void ext4_kvfree(void *ptr)
137 if (is_vmalloc_addr(ptr))
144 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
145 struct ext4_group_desc *bg)
147 return le32_to_cpu(bg->bg_block_bitmap_lo) |
148 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
149 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
152 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
153 struct ext4_group_desc *bg)
155 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
156 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
157 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
160 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
161 struct ext4_group_desc *bg)
163 return le32_to_cpu(bg->bg_inode_table_lo) |
164 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
165 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
168 __u32 ext4_free_group_clusters(struct super_block *sb,
169 struct ext4_group_desc *bg)
171 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
172 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
173 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
176 __u32 ext4_free_inodes_count(struct super_block *sb,
177 struct ext4_group_desc *bg)
179 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
180 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
181 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
184 __u32 ext4_used_dirs_count(struct super_block *sb,
185 struct ext4_group_desc *bg)
187 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
188 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
189 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
192 __u32 ext4_itable_unused_count(struct super_block *sb,
193 struct ext4_group_desc *bg)
195 return le16_to_cpu(bg->bg_itable_unused_lo) |
196 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
197 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
200 void ext4_block_bitmap_set(struct super_block *sb,
201 struct ext4_group_desc *bg, ext4_fsblk_t blk)
203 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
204 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
205 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
208 void ext4_inode_bitmap_set(struct super_block *sb,
209 struct ext4_group_desc *bg, ext4_fsblk_t blk)
211 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
212 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
213 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
216 void ext4_inode_table_set(struct super_block *sb,
217 struct ext4_group_desc *bg, ext4_fsblk_t blk)
219 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
220 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
221 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
224 void ext4_free_group_clusters_set(struct super_block *sb,
225 struct ext4_group_desc *bg, __u32 count)
227 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
228 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
229 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
232 void ext4_free_inodes_set(struct super_block *sb,
233 struct ext4_group_desc *bg, __u32 count)
235 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
236 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
237 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
240 void ext4_used_dirs_set(struct super_block *sb,
241 struct ext4_group_desc *bg, __u32 count)
243 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
244 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
245 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
248 void ext4_itable_unused_set(struct super_block *sb,
249 struct ext4_group_desc *bg, __u32 count)
251 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
252 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
253 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
257 /* Just increment the non-pointer handle value */
258 static handle_t *ext4_get_nojournal(void)
260 handle_t *handle = current->journal_info;
261 unsigned long ref_cnt = (unsigned long)handle;
263 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
266 handle = (handle_t *)ref_cnt;
268 current->journal_info = handle;
273 /* Decrement the non-pointer handle value */
274 static void ext4_put_nojournal(handle_t *handle)
276 unsigned long ref_cnt = (unsigned long)handle;
278 BUG_ON(ref_cnt == 0);
281 handle = (handle_t *)ref_cnt;
283 current->journal_info = handle;
287 * Wrappers for jbd2_journal_start/end.
289 * The only special thing we need to do here is to make sure that all
290 * journal_end calls result in the superblock being marked dirty, so
291 * that sync() will call the filesystem's write_super callback if
294 * To avoid j_barrier hold in userspace when a user calls freeze(),
295 * ext4 prevents a new handle from being started by s_frozen, which
296 * is in an upper layer.
298 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
303 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
304 if (sb->s_flags & MS_RDONLY)
305 return ERR_PTR(-EROFS);
307 journal = EXT4_SB(sb)->s_journal;
308 handle = ext4_journal_current_handle();
311 * If a handle has been started, it should be allowed to
312 * finish, otherwise deadlock could happen between freeze
313 * and others(e.g. truncate) due to the restart of the
314 * journal handle if the filesystem is forzen and active
315 * handles are not stopped.
318 vfs_check_frozen(sb, SB_FREEZE_TRANS);
321 return ext4_get_nojournal();
323 * Special case here: if the journal has aborted behind our
324 * backs (eg. EIO in the commit thread), then we still need to
325 * take the FS itself readonly cleanly.
327 if (is_journal_aborted(journal)) {
328 ext4_abort(sb, "Detected aborted journal");
329 return ERR_PTR(-EROFS);
331 return jbd2_journal_start(journal, nblocks);
335 * The only special thing we need to do here is to make sure that all
336 * jbd2_journal_stop calls result in the superblock being marked dirty, so
337 * that sync() will call the filesystem's write_super callback if
340 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
342 struct super_block *sb;
346 if (!ext4_handle_valid(handle)) {
347 ext4_put_nojournal(handle);
350 sb = handle->h_transaction->t_journal->j_private;
352 rc = jbd2_journal_stop(handle);
357 __ext4_std_error(sb, where, line, err);
361 void ext4_journal_abort_handle(const char *caller, unsigned int line,
362 const char *err_fn, struct buffer_head *bh,
363 handle_t *handle, int err)
366 const char *errstr = ext4_decode_error(NULL, err, nbuf);
368 BUG_ON(!ext4_handle_valid(handle));
371 BUFFER_TRACE(bh, "abort");
376 if (is_handle_aborted(handle))
379 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
380 caller, line, errstr, err_fn);
382 jbd2_journal_abort_handle(handle);
385 static void __save_error_info(struct super_block *sb, const char *func,
388 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
390 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
391 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
392 es->s_last_error_time = cpu_to_le32(get_seconds());
393 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
394 es->s_last_error_line = cpu_to_le32(line);
395 if (!es->s_first_error_time) {
396 es->s_first_error_time = es->s_last_error_time;
397 strncpy(es->s_first_error_func, func,
398 sizeof(es->s_first_error_func));
399 es->s_first_error_line = cpu_to_le32(line);
400 es->s_first_error_ino = es->s_last_error_ino;
401 es->s_first_error_block = es->s_last_error_block;
404 * Start the daily error reporting function if it hasn't been
407 if (!es->s_error_count)
408 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
409 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
412 static void save_error_info(struct super_block *sb, const char *func,
415 __save_error_info(sb, func, line);
416 ext4_commit_super(sb, 1);
420 * The del_gendisk() function uninitializes the disk-specific data
421 * structures, including the bdi structure, without telling anyone
422 * else. Once this happens, any attempt to call mark_buffer_dirty()
423 * (for example, by ext4_commit_super), will cause a kernel OOPS.
424 * This is a kludge to prevent these oops until we can put in a proper
425 * hook in del_gendisk() to inform the VFS and file system layers.
427 static int block_device_ejected(struct super_block *sb)
429 struct inode *bd_inode = sb->s_bdev->bd_inode;
430 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
432 return bdi->dev == NULL;
435 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
437 struct super_block *sb = journal->j_private;
438 struct ext4_sb_info *sbi = EXT4_SB(sb);
439 int error = is_journal_aborted(journal);
440 struct ext4_journal_cb_entry *jce, *tmp;
442 spin_lock(&sbi->s_md_lock);
443 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
444 list_del_init(&jce->jce_list);
445 spin_unlock(&sbi->s_md_lock);
446 jce->jce_func(sb, jce, error);
447 spin_lock(&sbi->s_md_lock);
449 spin_unlock(&sbi->s_md_lock);
452 /* Deal with the reporting of failure conditions on a filesystem such as
453 * inconsistencies detected or read IO failures.
455 * On ext2, we can store the error state of the filesystem in the
456 * superblock. That is not possible on ext4, because we may have other
457 * write ordering constraints on the superblock which prevent us from
458 * writing it out straight away; and given that the journal is about to
459 * be aborted, we can't rely on the current, or future, transactions to
460 * write out the superblock safely.
462 * We'll just use the jbd2_journal_abort() error code to record an error in
463 * the journal instead. On recovery, the journal will complain about
464 * that error until we've noted it down and cleared it.
467 static void ext4_handle_error(struct super_block *sb)
469 if (sb->s_flags & MS_RDONLY)
472 if (!test_opt(sb, ERRORS_CONT)) {
473 journal_t *journal = EXT4_SB(sb)->s_journal;
475 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
477 jbd2_journal_abort(journal, -EIO);
479 if (test_opt(sb, ERRORS_RO)) {
480 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
481 sb->s_flags |= MS_RDONLY;
483 if (test_opt(sb, ERRORS_PANIC))
484 panic("EXT4-fs (device %s): panic forced after error\n",
488 void __ext4_error(struct super_block *sb, const char *function,
489 unsigned int line, const char *fmt, ...)
491 struct va_format vaf;
497 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
498 sb->s_id, function, line, current->comm, &vaf);
501 ext4_handle_error(sb);
504 void ext4_error_inode(struct inode *inode, const char *function,
505 unsigned int line, ext4_fsblk_t block,
506 const char *fmt, ...)
509 struct va_format vaf;
510 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
512 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
513 es->s_last_error_block = cpu_to_le64(block);
514 save_error_info(inode->i_sb, function, line);
519 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
520 "inode #%lu: block %llu: comm %s: %pV\n",
521 inode->i_sb->s_id, function, line, inode->i_ino,
522 block, current->comm, &vaf);
524 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
525 "inode #%lu: comm %s: %pV\n",
526 inode->i_sb->s_id, function, line, inode->i_ino,
527 current->comm, &vaf);
530 ext4_handle_error(inode->i_sb);
533 void ext4_error_file(struct file *file, const char *function,
534 unsigned int line, ext4_fsblk_t block,
535 const char *fmt, ...)
538 struct va_format vaf;
539 struct ext4_super_block *es;
540 struct inode *inode = file->f_dentry->d_inode;
541 char pathname[80], *path;
543 es = EXT4_SB(inode->i_sb)->s_es;
544 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
545 save_error_info(inode->i_sb, function, line);
546 path = d_path(&(file->f_path), pathname, sizeof(pathname));
554 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
555 "block %llu: comm %s: path %s: %pV\n",
556 inode->i_sb->s_id, function, line, inode->i_ino,
557 block, current->comm, path, &vaf);
560 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
561 "comm %s: path %s: %pV\n",
562 inode->i_sb->s_id, function, line, inode->i_ino,
563 current->comm, path, &vaf);
566 ext4_handle_error(inode->i_sb);
569 static const char *ext4_decode_error(struct super_block *sb, int errno,
576 errstr = "IO failure";
579 errstr = "Out of memory";
582 if (!sb || (EXT4_SB(sb)->s_journal &&
583 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
584 errstr = "Journal has aborted";
586 errstr = "Readonly filesystem";
589 /* If the caller passed in an extra buffer for unknown
590 * errors, textualise them now. Else we just return
593 /* Check for truncated error codes... */
594 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
603 /* __ext4_std_error decodes expected errors from journaling functions
604 * automatically and invokes the appropriate error response. */
606 void __ext4_std_error(struct super_block *sb, const char *function,
607 unsigned int line, int errno)
612 /* Special case: if the error is EROFS, and we're not already
613 * inside a transaction, then there's really no point in logging
615 if (errno == -EROFS && journal_current_handle() == NULL &&
616 (sb->s_flags & MS_RDONLY))
619 errstr = ext4_decode_error(sb, errno, nbuf);
620 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
621 sb->s_id, function, line, errstr);
622 save_error_info(sb, function, line);
624 ext4_handle_error(sb);
628 * ext4_abort is a much stronger failure handler than ext4_error. The
629 * abort function may be used to deal with unrecoverable failures such
630 * as journal IO errors or ENOMEM at a critical moment in log management.
632 * We unconditionally force the filesystem into an ABORT|READONLY state,
633 * unless the error response on the fs has been set to panic in which
634 * case we take the easy way out and panic immediately.
637 void __ext4_abort(struct super_block *sb, const char *function,
638 unsigned int line, const char *fmt, ...)
642 save_error_info(sb, function, line);
644 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
650 if ((sb->s_flags & MS_RDONLY) == 0) {
651 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
652 sb->s_flags |= MS_RDONLY;
653 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
654 if (EXT4_SB(sb)->s_journal)
655 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
656 save_error_info(sb, function, line);
658 if (test_opt(sb, ERRORS_PANIC))
659 panic("EXT4-fs panic from previous error\n");
662 void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
664 struct va_format vaf;
670 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
674 void __ext4_warning(struct super_block *sb, const char *function,
675 unsigned int line, const char *fmt, ...)
677 struct va_format vaf;
683 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
684 sb->s_id, function, line, &vaf);
688 void __ext4_grp_locked_error(const char *function, unsigned int line,
689 struct super_block *sb, ext4_group_t grp,
690 unsigned long ino, ext4_fsblk_t block,
691 const char *fmt, ...)
695 struct va_format vaf;
697 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
699 es->s_last_error_ino = cpu_to_le32(ino);
700 es->s_last_error_block = cpu_to_le64(block);
701 __save_error_info(sb, function, line);
707 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
708 sb->s_id, function, line, grp);
710 printk(KERN_CONT "inode %lu: ", ino);
712 printk(KERN_CONT "block %llu:", (unsigned long long) block);
713 printk(KERN_CONT "%pV\n", &vaf);
716 if (test_opt(sb, ERRORS_CONT)) {
717 ext4_commit_super(sb, 0);
721 ext4_unlock_group(sb, grp);
722 ext4_handle_error(sb);
724 * We only get here in the ERRORS_RO case; relocking the group
725 * may be dangerous, but nothing bad will happen since the
726 * filesystem will have already been marked read/only and the
727 * journal has been aborted. We return 1 as a hint to callers
728 * who might what to use the return value from
729 * ext4_grp_locked_error() to distinguish between the
730 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
731 * aggressively from the ext4 function in question, with a
732 * more appropriate error code.
734 ext4_lock_group(sb, grp);
738 void ext4_update_dynamic_rev(struct super_block *sb)
740 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
742 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
746 "updating to rev %d because of new feature flag, "
747 "running e2fsck is recommended",
750 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
751 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
752 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
753 /* leave es->s_feature_*compat flags alone */
754 /* es->s_uuid will be set by e2fsck if empty */
757 * The rest of the superblock fields should be zero, and if not it
758 * means they are likely already in use, so leave them alone. We
759 * can leave it up to e2fsck to clean up any inconsistencies there.
764 * Open the external journal device
766 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
768 struct block_device *bdev;
769 char b[BDEVNAME_SIZE];
771 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
777 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
778 __bdevname(dev, b), PTR_ERR(bdev));
783 * Release the journal device
785 static int ext4_blkdev_put(struct block_device *bdev)
787 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
790 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
792 struct block_device *bdev;
795 bdev = sbi->journal_bdev;
797 ret = ext4_blkdev_put(bdev);
798 sbi->journal_bdev = NULL;
803 static inline struct inode *orphan_list_entry(struct list_head *l)
805 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
808 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
812 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
813 le32_to_cpu(sbi->s_es->s_last_orphan));
815 printk(KERN_ERR "sb_info orphan list:\n");
816 list_for_each(l, &sbi->s_orphan) {
817 struct inode *inode = orphan_list_entry(l);
819 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
820 inode->i_sb->s_id, inode->i_ino, inode,
821 inode->i_mode, inode->i_nlink,
826 static void ext4_put_super(struct super_block *sb)
828 struct ext4_sb_info *sbi = EXT4_SB(sb);
829 struct ext4_super_block *es = sbi->s_es;
832 ext4_unregister_li_request(sb);
833 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
835 flush_workqueue(sbi->dio_unwritten_wq);
836 destroy_workqueue(sbi->dio_unwritten_wq);
839 if (sbi->s_journal) {
840 err = jbd2_journal_destroy(sbi->s_journal);
841 sbi->s_journal = NULL;
843 ext4_abort(sb, "Couldn't clean up the journal");
846 del_timer(&sbi->s_err_report);
847 ext4_release_system_zone(sb);
849 ext4_ext_release(sb);
850 ext4_xattr_put_super(sb);
852 if (!(sb->s_flags & MS_RDONLY)) {
853 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
854 es->s_state = cpu_to_le16(sbi->s_mount_state);
856 if (sb->s_dirt || !(sb->s_flags & MS_RDONLY))
857 ext4_commit_super(sb, 1);
860 remove_proc_entry("options", sbi->s_proc);
861 remove_proc_entry(sb->s_id, ext4_proc_root);
863 kobject_del(&sbi->s_kobj);
865 for (i = 0; i < sbi->s_gdb_count; i++)
866 brelse(sbi->s_group_desc[i]);
867 ext4_kvfree(sbi->s_group_desc);
868 ext4_kvfree(sbi->s_flex_groups);
869 percpu_counter_destroy(&sbi->s_freeclusters_counter);
870 percpu_counter_destroy(&sbi->s_freeinodes_counter);
871 percpu_counter_destroy(&sbi->s_dirs_counter);
872 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
875 for (i = 0; i < MAXQUOTAS; i++)
876 kfree(sbi->s_qf_names[i]);
879 /* Debugging code just in case the in-memory inode orphan list
880 * isn't empty. The on-disk one can be non-empty if we've
881 * detected an error and taken the fs readonly, but the
882 * in-memory list had better be clean by this point. */
883 if (!list_empty(&sbi->s_orphan))
884 dump_orphan_list(sb, sbi);
885 J_ASSERT(list_empty(&sbi->s_orphan));
887 invalidate_bdev(sb->s_bdev);
888 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
890 * Invalidate the journal device's buffers. We don't want them
891 * floating about in memory - the physical journal device may
892 * hotswapped, and it breaks the `ro-after' testing code.
894 sync_blockdev(sbi->journal_bdev);
895 invalidate_bdev(sbi->journal_bdev);
896 ext4_blkdev_remove(sbi);
899 kthread_stop(sbi->s_mmp_tsk);
900 sb->s_fs_info = NULL;
902 * Now that we are completely done shutting down the
903 * superblock, we need to actually destroy the kobject.
906 kobject_put(&sbi->s_kobj);
907 wait_for_completion(&sbi->s_kobj_unregister);
908 kfree(sbi->s_blockgroup_lock);
912 static struct kmem_cache *ext4_inode_cachep;
915 * Called inside transaction, so use GFP_NOFS
917 static struct inode *ext4_alloc_inode(struct super_block *sb)
919 struct ext4_inode_info *ei;
921 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
925 ei->vfs_inode.i_version = 1;
926 ei->vfs_inode.i_data.writeback_index = 0;
927 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
928 INIT_LIST_HEAD(&ei->i_prealloc_list);
929 spin_lock_init(&ei->i_prealloc_lock);
930 ei->i_reserved_data_blocks = 0;
931 ei->i_reserved_meta_blocks = 0;
932 ei->i_allocated_meta_blocks = 0;
933 ei->i_da_metadata_calc_len = 0;
934 spin_lock_init(&(ei->i_block_reservation_lock));
936 ei->i_reserved_quota = 0;
939 INIT_LIST_HEAD(&ei->i_completed_io_list);
940 spin_lock_init(&ei->i_completed_io_lock);
941 ei->cur_aio_dio = NULL;
943 ei->i_datasync_tid = 0;
944 atomic_set(&ei->i_ioend_count, 0);
945 atomic_set(&ei->i_aiodio_unwritten, 0);
947 return &ei->vfs_inode;
950 static int ext4_drop_inode(struct inode *inode)
952 int drop = generic_drop_inode(inode);
954 trace_ext4_drop_inode(inode, drop);
958 static void ext4_i_callback(struct rcu_head *head)
960 struct inode *inode = container_of(head, struct inode, i_rcu);
961 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
964 static void ext4_destroy_inode(struct inode *inode)
966 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
967 ext4_msg(inode->i_sb, KERN_ERR,
968 "Inode %lu (%p): orphan list check failed!",
969 inode->i_ino, EXT4_I(inode));
970 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
971 EXT4_I(inode), sizeof(struct ext4_inode_info),
975 call_rcu(&inode->i_rcu, ext4_i_callback);
978 static void init_once(void *foo)
980 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
982 INIT_LIST_HEAD(&ei->i_orphan);
983 #ifdef CONFIG_EXT4_FS_XATTR
984 init_rwsem(&ei->xattr_sem);
986 init_rwsem(&ei->i_data_sem);
987 inode_init_once(&ei->vfs_inode);
990 static int init_inodecache(void)
992 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
993 sizeof(struct ext4_inode_info),
994 0, (SLAB_RECLAIM_ACCOUNT|
997 if (ext4_inode_cachep == NULL)
1002 static void destroy_inodecache(void)
1004 kmem_cache_destroy(ext4_inode_cachep);
1007 void ext4_clear_inode(struct inode *inode)
1009 invalidate_inode_buffers(inode);
1010 end_writeback(inode);
1012 ext4_discard_preallocations(inode);
1013 if (EXT4_I(inode)->jinode) {
1014 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1015 EXT4_I(inode)->jinode);
1016 jbd2_free_inode(EXT4_I(inode)->jinode);
1017 EXT4_I(inode)->jinode = NULL;
1021 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1022 u64 ino, u32 generation)
1024 struct inode *inode;
1026 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1027 return ERR_PTR(-ESTALE);
1028 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1029 return ERR_PTR(-ESTALE);
1031 /* iget isn't really right if the inode is currently unallocated!!
1033 * ext4_read_inode will return a bad_inode if the inode had been
1034 * deleted, so we should be safe.
1036 * Currently we don't know the generation for parent directory, so
1037 * a generation of 0 means "accept any"
1039 inode = ext4_iget(sb, ino);
1041 return ERR_CAST(inode);
1042 if (generation && inode->i_generation != generation) {
1044 return ERR_PTR(-ESTALE);
1050 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1051 int fh_len, int fh_type)
1053 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1054 ext4_nfs_get_inode);
1057 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1058 int fh_len, int fh_type)
1060 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1061 ext4_nfs_get_inode);
1065 * Try to release metadata pages (indirect blocks, directories) which are
1066 * mapped via the block device. Since these pages could have journal heads
1067 * which would prevent try_to_free_buffers() from freeing them, we must use
1068 * jbd2 layer's try_to_free_buffers() function to release them.
1070 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1073 journal_t *journal = EXT4_SB(sb)->s_journal;
1075 WARN_ON(PageChecked(page));
1076 if (!page_has_buffers(page))
1079 return jbd2_journal_try_to_free_buffers(journal, page,
1080 wait & ~__GFP_WAIT);
1081 return try_to_free_buffers(page);
1085 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1086 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1088 static int ext4_write_dquot(struct dquot *dquot);
1089 static int ext4_acquire_dquot(struct dquot *dquot);
1090 static int ext4_release_dquot(struct dquot *dquot);
1091 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1092 static int ext4_write_info(struct super_block *sb, int type);
1093 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1095 static int ext4_quota_off(struct super_block *sb, int type);
1096 static int ext4_quota_on_mount(struct super_block *sb, int type);
1097 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1098 size_t len, loff_t off);
1099 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1100 const char *data, size_t len, loff_t off);
1102 static const struct dquot_operations ext4_quota_operations = {
1103 .get_reserved_space = ext4_get_reserved_space,
1104 .write_dquot = ext4_write_dquot,
1105 .acquire_dquot = ext4_acquire_dquot,
1106 .release_dquot = ext4_release_dquot,
1107 .mark_dirty = ext4_mark_dquot_dirty,
1108 .write_info = ext4_write_info,
1109 .alloc_dquot = dquot_alloc,
1110 .destroy_dquot = dquot_destroy,
1113 static const struct quotactl_ops ext4_qctl_operations = {
1114 .quota_on = ext4_quota_on,
1115 .quota_off = ext4_quota_off,
1116 .quota_sync = dquot_quota_sync,
1117 .get_info = dquot_get_dqinfo,
1118 .set_info = dquot_set_dqinfo,
1119 .get_dqblk = dquot_get_dqblk,
1120 .set_dqblk = dquot_set_dqblk
1124 static const struct super_operations ext4_sops = {
1125 .alloc_inode = ext4_alloc_inode,
1126 .destroy_inode = ext4_destroy_inode,
1127 .write_inode = ext4_write_inode,
1128 .dirty_inode = ext4_dirty_inode,
1129 .drop_inode = ext4_drop_inode,
1130 .evict_inode = ext4_evict_inode,
1131 .put_super = ext4_put_super,
1132 .sync_fs = ext4_sync_fs,
1133 .freeze_fs = ext4_freeze,
1134 .unfreeze_fs = ext4_unfreeze,
1135 .statfs = ext4_statfs,
1136 .remount_fs = ext4_remount,
1137 .show_options = ext4_show_options,
1139 .quota_read = ext4_quota_read,
1140 .quota_write = ext4_quota_write,
1142 .bdev_try_to_free_page = bdev_try_to_free_page,
1145 static const struct super_operations ext4_nojournal_sops = {
1146 .alloc_inode = ext4_alloc_inode,
1147 .destroy_inode = ext4_destroy_inode,
1148 .write_inode = ext4_write_inode,
1149 .dirty_inode = ext4_dirty_inode,
1150 .drop_inode = ext4_drop_inode,
1151 .evict_inode = ext4_evict_inode,
1152 .write_super = ext4_write_super,
1153 .put_super = ext4_put_super,
1154 .statfs = ext4_statfs,
1155 .remount_fs = ext4_remount,
1156 .show_options = ext4_show_options,
1158 .quota_read = ext4_quota_read,
1159 .quota_write = ext4_quota_write,
1161 .bdev_try_to_free_page = bdev_try_to_free_page,
1164 static const struct export_operations ext4_export_ops = {
1165 .fh_to_dentry = ext4_fh_to_dentry,
1166 .fh_to_parent = ext4_fh_to_parent,
1167 .get_parent = ext4_get_parent,
1171 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1172 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1173 Opt_nouid32, Opt_debug, Opt_removed,
1174 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1175 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1176 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1177 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
1178 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1179 Opt_data_err_abort, Opt_data_err_ignore,
1180 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1181 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1182 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1183 Opt_usrquota, Opt_grpquota, Opt_i_version,
1184 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1185 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1186 Opt_inode_readahead_blks, Opt_journal_ioprio,
1187 Opt_dioread_nolock, Opt_dioread_lock,
1188 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1191 static const match_table_t tokens = {
1192 {Opt_bsd_df, "bsddf"},
1193 {Opt_minix_df, "minixdf"},
1194 {Opt_grpid, "grpid"},
1195 {Opt_grpid, "bsdgroups"},
1196 {Opt_nogrpid, "nogrpid"},
1197 {Opt_nogrpid, "sysvgroups"},
1198 {Opt_resgid, "resgid=%u"},
1199 {Opt_resuid, "resuid=%u"},
1201 {Opt_err_cont, "errors=continue"},
1202 {Opt_err_panic, "errors=panic"},
1203 {Opt_err_ro, "errors=remount-ro"},
1204 {Opt_nouid32, "nouid32"},
1205 {Opt_debug, "debug"},
1206 {Opt_removed, "oldalloc"},
1207 {Opt_removed, "orlov"},
1208 {Opt_user_xattr, "user_xattr"},
1209 {Opt_nouser_xattr, "nouser_xattr"},
1211 {Opt_noacl, "noacl"},
1212 {Opt_noload, "norecovery"},
1213 {Opt_noload, "noload"},
1214 {Opt_removed, "nobh"},
1215 {Opt_removed, "bh"},
1216 {Opt_commit, "commit=%u"},
1217 {Opt_min_batch_time, "min_batch_time=%u"},
1218 {Opt_max_batch_time, "max_batch_time=%u"},
1219 {Opt_journal_dev, "journal_dev=%u"},
1220 {Opt_journal_checksum, "journal_checksum"},
1221 {Opt_journal_async_commit, "journal_async_commit"},
1222 {Opt_abort, "abort"},
1223 {Opt_data_journal, "data=journal"},
1224 {Opt_data_ordered, "data=ordered"},
1225 {Opt_data_writeback, "data=writeback"},
1226 {Opt_data_err_abort, "data_err=abort"},
1227 {Opt_data_err_ignore, "data_err=ignore"},
1228 {Opt_offusrjquota, "usrjquota="},
1229 {Opt_usrjquota, "usrjquota=%s"},
1230 {Opt_offgrpjquota, "grpjquota="},
1231 {Opt_grpjquota, "grpjquota=%s"},
1232 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1233 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1234 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1235 {Opt_grpquota, "grpquota"},
1236 {Opt_noquota, "noquota"},
1237 {Opt_quota, "quota"},
1238 {Opt_usrquota, "usrquota"},
1239 {Opt_barrier, "barrier=%u"},
1240 {Opt_barrier, "barrier"},
1241 {Opt_nobarrier, "nobarrier"},
1242 {Opt_i_version, "i_version"},
1243 {Opt_stripe, "stripe=%u"},
1244 {Opt_delalloc, "delalloc"},
1245 {Opt_nodelalloc, "nodelalloc"},
1246 {Opt_mblk_io_submit, "mblk_io_submit"},
1247 {Opt_nomblk_io_submit, "nomblk_io_submit"},
1248 {Opt_block_validity, "block_validity"},
1249 {Opt_noblock_validity, "noblock_validity"},
1250 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1251 {Opt_journal_ioprio, "journal_ioprio=%u"},
1252 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1253 {Opt_auto_da_alloc, "auto_da_alloc"},
1254 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1255 {Opt_dioread_nolock, "dioread_nolock"},
1256 {Opt_dioread_lock, "dioread_lock"},
1257 {Opt_discard, "discard"},
1258 {Opt_nodiscard, "nodiscard"},
1259 {Opt_init_itable, "init_itable=%u"},
1260 {Opt_init_itable, "init_itable"},
1261 {Opt_noinit_itable, "noinit_itable"},
1262 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1263 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1264 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1265 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1266 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
1270 static ext4_fsblk_t get_sb_block(void **data)
1272 ext4_fsblk_t sb_block;
1273 char *options = (char *) *data;
1275 if (!options || strncmp(options, "sb=", 3) != 0)
1276 return 1; /* Default location */
1279 /* TODO: use simple_strtoll with >32bit ext4 */
1280 sb_block = simple_strtoul(options, &options, 0);
1281 if (*options && *options != ',') {
1282 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1286 if (*options == ',')
1288 *data = (void *) options;
1293 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1294 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1295 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1298 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1300 struct ext4_sb_info *sbi = EXT4_SB(sb);
1303 if (sb_any_quota_loaded(sb) &&
1304 !sbi->s_qf_names[qtype]) {
1305 ext4_msg(sb, KERN_ERR,
1306 "Cannot change journaled "
1307 "quota options when quota turned on");
1310 qname = match_strdup(args);
1312 ext4_msg(sb, KERN_ERR,
1313 "Not enough memory for storing quotafile name");
1316 if (sbi->s_qf_names[qtype] &&
1317 strcmp(sbi->s_qf_names[qtype], qname)) {
1318 ext4_msg(sb, KERN_ERR,
1319 "%s quota file already specified", QTYPE2NAME(qtype));
1323 sbi->s_qf_names[qtype] = qname;
1324 if (strchr(sbi->s_qf_names[qtype], '/')) {
1325 ext4_msg(sb, KERN_ERR,
1326 "quotafile must be on filesystem root");
1327 kfree(sbi->s_qf_names[qtype]);
1328 sbi->s_qf_names[qtype] = NULL;
1335 static int clear_qf_name(struct super_block *sb, int qtype)
1338 struct ext4_sb_info *sbi = EXT4_SB(sb);
1340 if (sb_any_quota_loaded(sb) &&
1341 sbi->s_qf_names[qtype]) {
1342 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1343 " when quota turned on");
1347 * The space will be released later when all options are confirmed
1350 sbi->s_qf_names[qtype] = NULL;
1355 #define MOPT_SET 0x0001
1356 #define MOPT_CLEAR 0x0002
1357 #define MOPT_NOSUPPORT 0x0004
1358 #define MOPT_EXPLICIT 0x0008
1359 #define MOPT_CLEAR_ERR 0x0010
1360 #define MOPT_GTE0 0x0020
1363 #define MOPT_QFMT 0x0040
1365 #define MOPT_Q MOPT_NOSUPPORT
1366 #define MOPT_QFMT MOPT_NOSUPPORT
1368 #define MOPT_DATAJ 0x0080
1370 static const struct mount_opts {
1374 } ext4_mount_opts[] = {
1375 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1376 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1377 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1378 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1379 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1380 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1381 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1382 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1383 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1384 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1385 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1386 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1387 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1388 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1389 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1390 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1391 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1392 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1393 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1394 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1395 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1396 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1397 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1398 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1399 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1400 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1401 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1402 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1403 {Opt_commit, 0, MOPT_GTE0},
1404 {Opt_max_batch_time, 0, MOPT_GTE0},
1405 {Opt_min_batch_time, 0, MOPT_GTE0},
1406 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1407 {Opt_init_itable, 0, MOPT_GTE0},
1408 {Opt_stripe, 0, MOPT_GTE0},
1409 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1410 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1411 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
1412 #ifdef CONFIG_EXT4_FS_XATTR
1413 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1414 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1416 {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1417 {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
1419 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1420 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1421 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1423 {Opt_acl, 0, MOPT_NOSUPPORT},
1424 {Opt_noacl, 0, MOPT_NOSUPPORT},
1426 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1427 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1428 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1429 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1431 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1433 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1434 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1435 {Opt_usrjquota, 0, MOPT_Q},
1436 {Opt_grpjquota, 0, MOPT_Q},
1437 {Opt_offusrjquota, 0, MOPT_Q},
1438 {Opt_offgrpjquota, 0, MOPT_Q},
1439 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1440 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1441 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1445 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1446 substring_t *args, unsigned long *journal_devnum,
1447 unsigned int *journal_ioprio, int is_remount)
1449 struct ext4_sb_info *sbi = EXT4_SB(sb);
1450 const struct mount_opts *m;
1454 if (token == Opt_usrjquota)
1455 return set_qf_name(sb, USRQUOTA, &args[0]);
1456 else if (token == Opt_grpjquota)
1457 return set_qf_name(sb, GRPQUOTA, &args[0]);
1458 else if (token == Opt_offusrjquota)
1459 return clear_qf_name(sb, USRQUOTA);
1460 else if (token == Opt_offgrpjquota)
1461 return clear_qf_name(sb, GRPQUOTA);
1463 if (args->from && match_int(args, &arg))
1467 case Opt_nouser_xattr:
1468 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1471 return 1; /* handled by get_sb_block() */
1473 ext4_msg(sb, KERN_WARNING,
1474 "Ignoring removed %s option", opt);
1477 sbi->s_resuid = arg;
1480 sbi->s_resgid = arg;
1483 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1486 sb->s_flags |= MS_I_VERSION;
1488 case Opt_journal_dev:
1490 ext4_msg(sb, KERN_ERR,
1491 "Cannot specify journal on remount");
1494 *journal_devnum = arg;
1496 case Opt_journal_ioprio:
1497 if (arg < 0 || arg > 7)
1499 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1503 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1504 if (token != m->token)
1506 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1508 if (m->flags & MOPT_EXPLICIT)
1509 set_opt2(sb, EXPLICIT_DELALLOC);
1510 if (m->flags & MOPT_CLEAR_ERR)
1511 clear_opt(sb, ERRORS_MASK);
1512 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1513 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1514 "options when quota turned on");
1518 if (m->flags & MOPT_NOSUPPORT) {
1519 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1520 } else if (token == Opt_commit) {
1522 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1523 sbi->s_commit_interval = HZ * arg;
1524 } else if (token == Opt_max_batch_time) {
1526 arg = EXT4_DEF_MAX_BATCH_TIME;
1527 sbi->s_max_batch_time = arg;
1528 } else if (token == Opt_min_batch_time) {
1529 sbi->s_min_batch_time = arg;
1530 } else if (token == Opt_inode_readahead_blks) {
1531 if (arg > (1 << 30))
1533 if (arg && !is_power_of_2(arg)) {
1534 ext4_msg(sb, KERN_ERR,
1535 "EXT4-fs: inode_readahead_blks"
1536 " must be a power of 2");
1539 sbi->s_inode_readahead_blks = arg;
1540 } else if (token == Opt_init_itable) {
1541 set_opt(sb, INIT_INODE_TABLE);
1543 arg = EXT4_DEF_LI_WAIT_MULT;
1544 sbi->s_li_wait_mult = arg;
1545 } else if (token == Opt_stripe) {
1546 sbi->s_stripe = arg;
1547 } else if (m->flags & MOPT_DATAJ) {
1549 if (!sbi->s_journal)
1550 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1551 else if (test_opt(sb, DATA_FLAGS) !=
1553 ext4_msg(sb, KERN_ERR,
1554 "Cannot change data mode on remount");
1558 clear_opt(sb, DATA_FLAGS);
1559 sbi->s_mount_opt |= m->mount_opt;
1562 } else if (m->flags & MOPT_QFMT) {
1563 if (sb_any_quota_loaded(sb) &&
1564 sbi->s_jquota_fmt != m->mount_opt) {
1565 ext4_msg(sb, KERN_ERR, "Cannot "
1566 "change journaled quota options "
1567 "when quota turned on");
1570 sbi->s_jquota_fmt = m->mount_opt;
1575 if (m->flags & MOPT_CLEAR)
1577 else if (unlikely(!(m->flags & MOPT_SET))) {
1578 ext4_msg(sb, KERN_WARNING,
1579 "buggy handling of option %s", opt);
1584 sbi->s_mount_opt |= m->mount_opt;
1586 sbi->s_mount_opt &= ~m->mount_opt;
1590 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1591 "or missing value", opt);
1595 static int parse_options(char *options, struct super_block *sb,
1596 unsigned long *journal_devnum,
1597 unsigned int *journal_ioprio,
1600 struct ext4_sb_info *sbi = EXT4_SB(sb);
1602 substring_t args[MAX_OPT_ARGS];
1608 while ((p = strsep(&options, ",")) != NULL) {
1612 * Initialize args struct so we know whether arg was
1613 * found; some options take optional arguments.
1615 args[0].to = args[0].from = 0;
1616 token = match_token(p, tokens, args);
1617 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1618 journal_ioprio, is_remount) < 0)
1622 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1623 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1624 clear_opt(sb, USRQUOTA);
1626 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1627 clear_opt(sb, GRPQUOTA);
1629 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1630 ext4_msg(sb, KERN_ERR, "old and new quota "
1635 if (!sbi->s_jquota_fmt) {
1636 ext4_msg(sb, KERN_ERR, "journaled quota format "
1641 if (sbi->s_jquota_fmt) {
1642 ext4_msg(sb, KERN_ERR, "journaled quota format "
1643 "specified with no journaling "
1652 static inline void ext4_show_quota_options(struct seq_file *seq,
1653 struct super_block *sb)
1655 #if defined(CONFIG_QUOTA)
1656 struct ext4_sb_info *sbi = EXT4_SB(sb);
1658 if (sbi->s_jquota_fmt) {
1661 switch (sbi->s_jquota_fmt) {
1672 seq_printf(seq, ",jqfmt=%s", fmtname);
1675 if (sbi->s_qf_names[USRQUOTA])
1676 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1678 if (sbi->s_qf_names[GRPQUOTA])
1679 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1681 if (test_opt(sb, USRQUOTA))
1682 seq_puts(seq, ",usrquota");
1684 if (test_opt(sb, GRPQUOTA))
1685 seq_puts(seq, ",grpquota");
1689 static const char *token2str(int token)
1691 static const struct match_token *t;
1693 for (t = tokens; t->token != Opt_err; t++)
1694 if (t->token == token && !strchr(t->pattern, '='))
1701 * - it's set to a non-default value OR
1702 * - if the per-sb default is different from the global default
1704 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1707 struct ext4_sb_info *sbi = EXT4_SB(sb);
1708 struct ext4_super_block *es = sbi->s_es;
1709 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1710 const struct mount_opts *m;
1711 char sep = nodefs ? '\n' : ',';
1713 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1714 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1716 if (sbi->s_sb_block != 1)
1717 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1719 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1720 int want_set = m->flags & MOPT_SET;
1721 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1722 (m->flags & MOPT_CLEAR_ERR))
1724 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1725 continue; /* skip if same as the default */
1727 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1728 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1729 continue; /* select Opt_noFoo vs Opt_Foo */
1730 SEQ_OPTS_PRINT("%s", token2str(m->token));
1733 if (nodefs || sbi->s_resuid != EXT4_DEF_RESUID ||
1734 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1735 SEQ_OPTS_PRINT("resuid=%u", sbi->s_resuid);
1736 if (nodefs || sbi->s_resgid != EXT4_DEF_RESGID ||
1737 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1738 SEQ_OPTS_PRINT("resgid=%u", sbi->s_resgid);
1739 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1740 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1741 SEQ_OPTS_PUTS("errors=remount-ro");
1742 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1743 SEQ_OPTS_PUTS("errors=continue");
1744 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1745 SEQ_OPTS_PUTS("errors=panic");
1746 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1747 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1748 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1749 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1750 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1751 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1752 if (sb->s_flags & MS_I_VERSION)
1753 SEQ_OPTS_PUTS("i_version");
1754 if (nodefs || sbi->s_stripe)
1755 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1756 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1757 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1758 SEQ_OPTS_PUTS("data=journal");
1759 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1760 SEQ_OPTS_PUTS("data=ordered");
1761 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1762 SEQ_OPTS_PUTS("data=writeback");
1765 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1766 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1767 sbi->s_inode_readahead_blks);
1769 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1770 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1771 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1773 ext4_show_quota_options(seq, sb);
1777 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1779 return _ext4_show_options(seq, root->d_sb, 0);
1782 static int options_seq_show(struct seq_file *seq, void *offset)
1784 struct super_block *sb = seq->private;
1787 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1788 rc = _ext4_show_options(seq, sb, 1);
1789 seq_puts(seq, "\n");
1793 static int options_open_fs(struct inode *inode, struct file *file)
1795 return single_open(file, options_seq_show, PDE(inode)->data);
1798 static const struct file_operations ext4_seq_options_fops = {
1799 .owner = THIS_MODULE,
1800 .open = options_open_fs,
1802 .llseek = seq_lseek,
1803 .release = single_release,
1806 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1809 struct ext4_sb_info *sbi = EXT4_SB(sb);
1812 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1813 ext4_msg(sb, KERN_ERR, "revision level too high, "
1814 "forcing read-only mode");
1819 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1820 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1821 "running e2fsck is recommended");
1822 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1823 ext4_msg(sb, KERN_WARNING,
1824 "warning: mounting fs with errors, "
1825 "running e2fsck is recommended");
1826 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1827 le16_to_cpu(es->s_mnt_count) >=
1828 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1829 ext4_msg(sb, KERN_WARNING,
1830 "warning: maximal mount count reached, "
1831 "running e2fsck is recommended");
1832 else if (le32_to_cpu(es->s_checkinterval) &&
1833 (le32_to_cpu(es->s_lastcheck) +
1834 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1835 ext4_msg(sb, KERN_WARNING,
1836 "warning: checktime reached, "
1837 "running e2fsck is recommended");
1838 if (!sbi->s_journal)
1839 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1840 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1841 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1842 le16_add_cpu(&es->s_mnt_count, 1);
1843 es->s_mtime = cpu_to_le32(get_seconds());
1844 ext4_update_dynamic_rev(sb);
1846 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1848 ext4_commit_super(sb, 1);
1850 if (test_opt(sb, DEBUG))
1851 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1852 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1854 sbi->s_groups_count,
1855 EXT4_BLOCKS_PER_GROUP(sb),
1856 EXT4_INODES_PER_GROUP(sb),
1857 sbi->s_mount_opt, sbi->s_mount_opt2);
1859 cleancache_init_fs(sb);
1863 static int ext4_fill_flex_info(struct super_block *sb)
1865 struct ext4_sb_info *sbi = EXT4_SB(sb);
1866 struct ext4_group_desc *gdp = NULL;
1867 ext4_group_t flex_group_count;
1868 ext4_group_t flex_group;
1869 unsigned int groups_per_flex = 0;
1873 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1874 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1875 sbi->s_log_groups_per_flex = 0;
1878 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1880 /* We allocate both existing and potentially added groups */
1881 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1882 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1883 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1884 size = flex_group_count * sizeof(struct flex_groups);
1885 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
1886 if (sbi->s_flex_groups == NULL) {
1887 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
1892 for (i = 0; i < sbi->s_groups_count; i++) {
1893 gdp = ext4_get_group_desc(sb, i, NULL);
1895 flex_group = ext4_flex_group(sbi, i);
1896 atomic_add(ext4_free_inodes_count(sb, gdp),
1897 &sbi->s_flex_groups[flex_group].free_inodes);
1898 atomic_add(ext4_free_group_clusters(sb, gdp),
1899 &sbi->s_flex_groups[flex_group].free_clusters);
1900 atomic_add(ext4_used_dirs_count(sb, gdp),
1901 &sbi->s_flex_groups[flex_group].used_dirs);
1909 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1910 struct ext4_group_desc *gdp)
1914 if (sbi->s_es->s_feature_ro_compat &
1915 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1916 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1917 __le32 le_group = cpu_to_le32(block_group);
1919 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1920 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1921 crc = crc16(crc, (__u8 *)gdp, offset);
1922 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1923 /* for checksum of struct ext4_group_desc do the rest...*/
1924 if ((sbi->s_es->s_feature_incompat &
1925 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1926 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1927 crc = crc16(crc, (__u8 *)gdp + offset,
1928 le16_to_cpu(sbi->s_es->s_desc_size) -
1932 return cpu_to_le16(crc);
1935 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1936 struct ext4_group_desc *gdp)
1938 if ((sbi->s_es->s_feature_ro_compat &
1939 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1940 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1946 /* Called at mount-time, super-block is locked */
1947 static int ext4_check_descriptors(struct super_block *sb,
1948 ext4_group_t *first_not_zeroed)
1950 struct ext4_sb_info *sbi = EXT4_SB(sb);
1951 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1952 ext4_fsblk_t last_block;
1953 ext4_fsblk_t block_bitmap;
1954 ext4_fsblk_t inode_bitmap;
1955 ext4_fsblk_t inode_table;
1956 int flexbg_flag = 0;
1957 ext4_group_t i, grp = sbi->s_groups_count;
1959 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1962 ext4_debug("Checking group descriptors");
1964 for (i = 0; i < sbi->s_groups_count; i++) {
1965 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1967 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1968 last_block = ext4_blocks_count(sbi->s_es) - 1;
1970 last_block = first_block +
1971 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1973 if ((grp == sbi->s_groups_count) &&
1974 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
1977 block_bitmap = ext4_block_bitmap(sb, gdp);
1978 if (block_bitmap < first_block || block_bitmap > last_block) {
1979 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1980 "Block bitmap for group %u not in group "
1981 "(block %llu)!", i, block_bitmap);
1984 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1985 if (inode_bitmap < first_block || inode_bitmap > last_block) {
1986 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1987 "Inode bitmap for group %u not in group "
1988 "(block %llu)!", i, inode_bitmap);
1991 inode_table = ext4_inode_table(sb, gdp);
1992 if (inode_table < first_block ||
1993 inode_table + sbi->s_itb_per_group - 1 > last_block) {
1994 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1995 "Inode table for group %u not in group "
1996 "(block %llu)!", i, inode_table);
1999 ext4_lock_group(sb, i);
2000 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
2001 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2002 "Checksum for group %u failed (%u!=%u)",
2003 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2004 gdp)), le16_to_cpu(gdp->bg_checksum));
2005 if (!(sb->s_flags & MS_RDONLY)) {
2006 ext4_unlock_group(sb, i);
2010 ext4_unlock_group(sb, i);
2012 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2014 if (NULL != first_not_zeroed)
2015 *first_not_zeroed = grp;
2017 ext4_free_blocks_count_set(sbi->s_es,
2018 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2019 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2023 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2024 * the superblock) which were deleted from all directories, but held open by
2025 * a process at the time of a crash. We walk the list and try to delete these
2026 * inodes at recovery time (only with a read-write filesystem).
2028 * In order to keep the orphan inode chain consistent during traversal (in
2029 * case of crash during recovery), we link each inode into the superblock
2030 * orphan list_head and handle it the same way as an inode deletion during
2031 * normal operation (which journals the operations for us).
2033 * We only do an iget() and an iput() on each inode, which is very safe if we
2034 * accidentally point at an in-use or already deleted inode. The worst that
2035 * can happen in this case is that we get a "bit already cleared" message from
2036 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2037 * e2fsck was run on this filesystem, and it must have already done the orphan
2038 * inode cleanup for us, so we can safely abort without any further action.
2040 static void ext4_orphan_cleanup(struct super_block *sb,
2041 struct ext4_super_block *es)
2043 unsigned int s_flags = sb->s_flags;
2044 int nr_orphans = 0, nr_truncates = 0;
2048 if (!es->s_last_orphan) {
2049 jbd_debug(4, "no orphan inodes to clean up\n");
2053 if (bdev_read_only(sb->s_bdev)) {
2054 ext4_msg(sb, KERN_ERR, "write access "
2055 "unavailable, skipping orphan cleanup");
2059 /* Check if feature set would not allow a r/w mount */
2060 if (!ext4_feature_set_ok(sb, 0)) {
2061 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2062 "unknown ROCOMPAT features");
2066 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2067 if (es->s_last_orphan)
2068 jbd_debug(1, "Errors on filesystem, "
2069 "clearing orphan list.\n");
2070 es->s_last_orphan = 0;
2071 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2075 if (s_flags & MS_RDONLY) {
2076 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2077 sb->s_flags &= ~MS_RDONLY;
2080 /* Needed for iput() to work correctly and not trash data */
2081 sb->s_flags |= MS_ACTIVE;
2082 /* Turn on quotas so that they are updated correctly */
2083 for (i = 0; i < MAXQUOTAS; i++) {
2084 if (EXT4_SB(sb)->s_qf_names[i]) {
2085 int ret = ext4_quota_on_mount(sb, i);
2087 ext4_msg(sb, KERN_ERR,
2088 "Cannot turn on journaled "
2089 "quota: error %d", ret);
2094 while (es->s_last_orphan) {
2095 struct inode *inode;
2097 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2098 if (IS_ERR(inode)) {
2099 es->s_last_orphan = 0;
2103 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2104 dquot_initialize(inode);
2105 if (inode->i_nlink) {
2106 ext4_msg(sb, KERN_DEBUG,
2107 "%s: truncating inode %lu to %lld bytes",
2108 __func__, inode->i_ino, inode->i_size);
2109 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2110 inode->i_ino, inode->i_size);
2111 ext4_truncate(inode);
2114 ext4_msg(sb, KERN_DEBUG,
2115 "%s: deleting unreferenced inode %lu",
2116 __func__, inode->i_ino);
2117 jbd_debug(2, "deleting unreferenced inode %lu\n",
2121 iput(inode); /* The delete magic happens here! */
2124 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2127 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2128 PLURAL(nr_orphans));
2130 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2131 PLURAL(nr_truncates));
2133 /* Turn quotas off */
2134 for (i = 0; i < MAXQUOTAS; i++) {
2135 if (sb_dqopt(sb)->files[i])
2136 dquot_quota_off(sb, i);
2139 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2143 * Maximal extent format file size.
2144 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2145 * extent format containers, within a sector_t, and within i_blocks
2146 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2147 * so that won't be a limiting factor.
2149 * However there is other limiting factor. We do store extents in the form
2150 * of starting block and length, hence the resulting length of the extent
2151 * covering maximum file size must fit into on-disk format containers as
2152 * well. Given that length is always by 1 unit bigger than max unit (because
2153 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2155 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2157 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2160 loff_t upper_limit = MAX_LFS_FILESIZE;
2162 /* small i_blocks in vfs inode? */
2163 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2165 * CONFIG_LBDAF is not enabled implies the inode
2166 * i_block represent total blocks in 512 bytes
2167 * 32 == size of vfs inode i_blocks * 8
2169 upper_limit = (1LL << 32) - 1;
2171 /* total blocks in file system block size */
2172 upper_limit >>= (blkbits - 9);
2173 upper_limit <<= blkbits;
2177 * 32-bit extent-start container, ee_block. We lower the maxbytes
2178 * by one fs block, so ee_len can cover the extent of maximum file
2181 res = (1LL << 32) - 1;
2184 /* Sanity check against vm- & vfs- imposed limits */
2185 if (res > upper_limit)
2192 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2193 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2194 * We need to be 1 filesystem block less than the 2^48 sector limit.
2196 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2198 loff_t res = EXT4_NDIR_BLOCKS;
2201 /* This is calculated to be the largest file size for a dense, block
2202 * mapped file such that the file's total number of 512-byte sectors,
2203 * including data and all indirect blocks, does not exceed (2^48 - 1).
2205 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2206 * number of 512-byte sectors of the file.
2209 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2211 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2212 * the inode i_block field represents total file blocks in
2213 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2215 upper_limit = (1LL << 32) - 1;
2217 /* total blocks in file system block size */
2218 upper_limit >>= (bits - 9);
2222 * We use 48 bit ext4_inode i_blocks
2223 * With EXT4_HUGE_FILE_FL set the i_blocks
2224 * represent total number of blocks in
2225 * file system block size
2227 upper_limit = (1LL << 48) - 1;
2231 /* indirect blocks */
2233 /* double indirect blocks */
2234 meta_blocks += 1 + (1LL << (bits-2));
2235 /* tripple indirect blocks */
2236 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2238 upper_limit -= meta_blocks;
2239 upper_limit <<= bits;
2241 res += 1LL << (bits-2);
2242 res += 1LL << (2*(bits-2));
2243 res += 1LL << (3*(bits-2));
2245 if (res > upper_limit)
2248 if (res > MAX_LFS_FILESIZE)
2249 res = MAX_LFS_FILESIZE;
2254 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2255 ext4_fsblk_t logical_sb_block, int nr)
2257 struct ext4_sb_info *sbi = EXT4_SB(sb);
2258 ext4_group_t bg, first_meta_bg;
2261 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2263 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2265 return logical_sb_block + nr + 1;
2266 bg = sbi->s_desc_per_block * nr;
2267 if (ext4_bg_has_super(sb, bg))
2270 return (has_super + ext4_group_first_block_no(sb, bg));
2274 * ext4_get_stripe_size: Get the stripe size.
2275 * @sbi: In memory super block info
2277 * If we have specified it via mount option, then
2278 * use the mount option value. If the value specified at mount time is
2279 * greater than the blocks per group use the super block value.
2280 * If the super block value is greater than blocks per group return 0.
2281 * Allocator needs it be less than blocks per group.
2284 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2286 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2287 unsigned long stripe_width =
2288 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2291 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2292 ret = sbi->s_stripe;
2293 else if (stripe_width <= sbi->s_blocks_per_group)
2295 else if (stride <= sbi->s_blocks_per_group)
2301 * If the stripe width is 1, this makes no sense and
2302 * we set it to 0 to turn off stripe handling code.
2313 struct attribute attr;
2314 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2315 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2316 const char *, size_t);
2320 static int parse_strtoul(const char *buf,
2321 unsigned long max, unsigned long *value)
2325 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2326 endp = skip_spaces(endp);
2327 if (*endp || *value > max)
2333 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2334 struct ext4_sb_info *sbi,
2337 return snprintf(buf, PAGE_SIZE, "%llu\n",
2339 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
2342 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2343 struct ext4_sb_info *sbi, char *buf)
2345 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2347 if (!sb->s_bdev->bd_part)
2348 return snprintf(buf, PAGE_SIZE, "0\n");
2349 return snprintf(buf, PAGE_SIZE, "%lu\n",
2350 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2351 sbi->s_sectors_written_start) >> 1);
2354 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2355 struct ext4_sb_info *sbi, char *buf)
2357 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2359 if (!sb->s_bdev->bd_part)
2360 return snprintf(buf, PAGE_SIZE, "0\n");
2361 return snprintf(buf, PAGE_SIZE, "%llu\n",
2362 (unsigned long long)(sbi->s_kbytes_written +
2363 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2364 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2367 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2368 struct ext4_sb_info *sbi,
2369 const char *buf, size_t count)
2373 if (parse_strtoul(buf, 0x40000000, &t))
2376 if (t && !is_power_of_2(t))
2379 sbi->s_inode_readahead_blks = t;
2383 static ssize_t sbi_ui_show(struct ext4_attr *a,
2384 struct ext4_sb_info *sbi, char *buf)
2386 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2388 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2391 static ssize_t sbi_ui_store(struct ext4_attr *a,
2392 struct ext4_sb_info *sbi,
2393 const char *buf, size_t count)
2395 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2398 if (parse_strtoul(buf, 0xffffffff, &t))
2404 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2405 static struct ext4_attr ext4_attr_##_name = { \
2406 .attr = {.name = __stringify(_name), .mode = _mode }, \
2409 .offset = offsetof(struct ext4_sb_info, _elname), \
2411 #define EXT4_ATTR(name, mode, show, store) \
2412 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2414 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2415 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2416 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2417 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2418 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2419 #define ATTR_LIST(name) &ext4_attr_##name.attr
2421 EXT4_RO_ATTR(delayed_allocation_blocks);
2422 EXT4_RO_ATTR(session_write_kbytes);
2423 EXT4_RO_ATTR(lifetime_write_kbytes);
2424 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2425 inode_readahead_blks_store, s_inode_readahead_blks);
2426 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2427 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2428 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2429 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2430 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2431 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2432 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2433 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2435 static struct attribute *ext4_attrs[] = {
2436 ATTR_LIST(delayed_allocation_blocks),
2437 ATTR_LIST(session_write_kbytes),
2438 ATTR_LIST(lifetime_write_kbytes),
2439 ATTR_LIST(inode_readahead_blks),
2440 ATTR_LIST(inode_goal),
2441 ATTR_LIST(mb_stats),
2442 ATTR_LIST(mb_max_to_scan),
2443 ATTR_LIST(mb_min_to_scan),
2444 ATTR_LIST(mb_order2_req),
2445 ATTR_LIST(mb_stream_req),
2446 ATTR_LIST(mb_group_prealloc),
2447 ATTR_LIST(max_writeback_mb_bump),
2451 /* Features this copy of ext4 supports */
2452 EXT4_INFO_ATTR(lazy_itable_init);
2453 EXT4_INFO_ATTR(batched_discard);
2455 static struct attribute *ext4_feat_attrs[] = {
2456 ATTR_LIST(lazy_itable_init),
2457 ATTR_LIST(batched_discard),
2461 static ssize_t ext4_attr_show(struct kobject *kobj,
2462 struct attribute *attr, char *buf)
2464 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2466 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2468 return a->show ? a->show(a, sbi, buf) : 0;
2471 static ssize_t ext4_attr_store(struct kobject *kobj,
2472 struct attribute *attr,
2473 const char *buf, size_t len)
2475 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2477 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2479 return a->store ? a->store(a, sbi, buf, len) : 0;
2482 static void ext4_sb_release(struct kobject *kobj)
2484 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2486 complete(&sbi->s_kobj_unregister);
2489 static const struct sysfs_ops ext4_attr_ops = {
2490 .show = ext4_attr_show,
2491 .store = ext4_attr_store,
2494 static struct kobj_type ext4_ktype = {
2495 .default_attrs = ext4_attrs,
2496 .sysfs_ops = &ext4_attr_ops,
2497 .release = ext4_sb_release,
2500 static void ext4_feat_release(struct kobject *kobj)
2502 complete(&ext4_feat->f_kobj_unregister);
2505 static struct kobj_type ext4_feat_ktype = {
2506 .default_attrs = ext4_feat_attrs,
2507 .sysfs_ops = &ext4_attr_ops,
2508 .release = ext4_feat_release,
2512 * Check whether this filesystem can be mounted based on
2513 * the features present and the RDONLY/RDWR mount requested.
2514 * Returns 1 if this filesystem can be mounted as requested,
2515 * 0 if it cannot be.
2517 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2519 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2520 ext4_msg(sb, KERN_ERR,
2521 "Couldn't mount because of "
2522 "unsupported optional features (%x)",
2523 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2524 ~EXT4_FEATURE_INCOMPAT_SUPP));
2531 /* Check that feature set is OK for a read-write mount */
2532 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2533 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2534 "unsupported optional features (%x)",
2535 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2536 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2540 * Large file size enabled file system can only be mounted
2541 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2543 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2544 if (sizeof(blkcnt_t) < sizeof(u64)) {
2545 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2546 "cannot be mounted RDWR without "
2551 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2552 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2553 ext4_msg(sb, KERN_ERR,
2554 "Can't support bigalloc feature without "
2555 "extents feature\n");
2562 * This function is called once a day if we have errors logged
2563 * on the file system
2565 static void print_daily_error_info(unsigned long arg)
2567 struct super_block *sb = (struct super_block *) arg;
2568 struct ext4_sb_info *sbi;
2569 struct ext4_super_block *es;
2574 if (es->s_error_count)
2575 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2576 le32_to_cpu(es->s_error_count));
2577 if (es->s_first_error_time) {
2578 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2579 sb->s_id, le32_to_cpu(es->s_first_error_time),
2580 (int) sizeof(es->s_first_error_func),
2581 es->s_first_error_func,
2582 le32_to_cpu(es->s_first_error_line));
2583 if (es->s_first_error_ino)
2584 printk(": inode %u",
2585 le32_to_cpu(es->s_first_error_ino));
2586 if (es->s_first_error_block)
2587 printk(": block %llu", (unsigned long long)
2588 le64_to_cpu(es->s_first_error_block));
2591 if (es->s_last_error_time) {
2592 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2593 sb->s_id, le32_to_cpu(es->s_last_error_time),
2594 (int) sizeof(es->s_last_error_func),
2595 es->s_last_error_func,
2596 le32_to_cpu(es->s_last_error_line));
2597 if (es->s_last_error_ino)
2598 printk(": inode %u",
2599 le32_to_cpu(es->s_last_error_ino));
2600 if (es->s_last_error_block)
2601 printk(": block %llu", (unsigned long long)
2602 le64_to_cpu(es->s_last_error_block));
2605 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2608 /* Find next suitable group and run ext4_init_inode_table */
2609 static int ext4_run_li_request(struct ext4_li_request *elr)
2611 struct ext4_group_desc *gdp = NULL;
2612 ext4_group_t group, ngroups;
2613 struct super_block *sb;
2614 unsigned long timeout = 0;
2618 ngroups = EXT4_SB(sb)->s_groups_count;
2620 for (group = elr->lr_next_group; group < ngroups; group++) {
2621 gdp = ext4_get_group_desc(sb, group, NULL);
2627 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2631 if (group == ngroups)
2636 ret = ext4_init_inode_table(sb, group,
2637 elr->lr_timeout ? 0 : 1);
2638 if (elr->lr_timeout == 0) {
2639 timeout = (jiffies - timeout) *
2640 elr->lr_sbi->s_li_wait_mult;
2641 elr->lr_timeout = timeout;
2643 elr->lr_next_sched = jiffies + elr->lr_timeout;
2644 elr->lr_next_group = group + 1;
2651 * Remove lr_request from the list_request and free the
2652 * request structure. Should be called with li_list_mtx held
2654 static void ext4_remove_li_request(struct ext4_li_request *elr)
2656 struct ext4_sb_info *sbi;
2663 list_del(&elr->lr_request);
2664 sbi->s_li_request = NULL;
2668 static void ext4_unregister_li_request(struct super_block *sb)
2670 mutex_lock(&ext4_li_mtx);
2671 if (!ext4_li_info) {
2672 mutex_unlock(&ext4_li_mtx);
2676 mutex_lock(&ext4_li_info->li_list_mtx);
2677 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2678 mutex_unlock(&ext4_li_info->li_list_mtx);
2679 mutex_unlock(&ext4_li_mtx);
2682 static struct task_struct *ext4_lazyinit_task;
2685 * This is the function where ext4lazyinit thread lives. It walks
2686 * through the request list searching for next scheduled filesystem.
2687 * When such a fs is found, run the lazy initialization request
2688 * (ext4_rn_li_request) and keep track of the time spend in this
2689 * function. Based on that time we compute next schedule time of
2690 * the request. When walking through the list is complete, compute
2691 * next waking time and put itself into sleep.
2693 static int ext4_lazyinit_thread(void *arg)
2695 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2696 struct list_head *pos, *n;
2697 struct ext4_li_request *elr;
2698 unsigned long next_wakeup, cur;
2700 BUG_ON(NULL == eli);
2704 next_wakeup = MAX_JIFFY_OFFSET;
2706 mutex_lock(&eli->li_list_mtx);
2707 if (list_empty(&eli->li_request_list)) {
2708 mutex_unlock(&eli->li_list_mtx);
2712 list_for_each_safe(pos, n, &eli->li_request_list) {
2713 elr = list_entry(pos, struct ext4_li_request,
2716 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2717 if (ext4_run_li_request(elr) != 0) {
2718 /* error, remove the lazy_init job */
2719 ext4_remove_li_request(elr);
2724 if (time_before(elr->lr_next_sched, next_wakeup))
2725 next_wakeup = elr->lr_next_sched;
2727 mutex_unlock(&eli->li_list_mtx);
2732 if ((time_after_eq(cur, next_wakeup)) ||
2733 (MAX_JIFFY_OFFSET == next_wakeup)) {
2738 schedule_timeout_interruptible(next_wakeup - cur);
2740 if (kthread_should_stop()) {
2741 ext4_clear_request_list();
2748 * It looks like the request list is empty, but we need
2749 * to check it under the li_list_mtx lock, to prevent any
2750 * additions into it, and of course we should lock ext4_li_mtx
2751 * to atomically free the list and ext4_li_info, because at
2752 * this point another ext4 filesystem could be registering
2755 mutex_lock(&ext4_li_mtx);
2756 mutex_lock(&eli->li_list_mtx);
2757 if (!list_empty(&eli->li_request_list)) {
2758 mutex_unlock(&eli->li_list_mtx);
2759 mutex_unlock(&ext4_li_mtx);
2762 mutex_unlock(&eli->li_list_mtx);
2763 kfree(ext4_li_info);
2764 ext4_li_info = NULL;
2765 mutex_unlock(&ext4_li_mtx);
2770 static void ext4_clear_request_list(void)
2772 struct list_head *pos, *n;
2773 struct ext4_li_request *elr;
2775 mutex_lock(&ext4_li_info->li_list_mtx);
2776 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2777 elr = list_entry(pos, struct ext4_li_request,
2779 ext4_remove_li_request(elr);
2781 mutex_unlock(&ext4_li_info->li_list_mtx);
2784 static int ext4_run_lazyinit_thread(void)
2786 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2787 ext4_li_info, "ext4lazyinit");
2788 if (IS_ERR(ext4_lazyinit_task)) {
2789 int err = PTR_ERR(ext4_lazyinit_task);
2790 ext4_clear_request_list();
2791 kfree(ext4_li_info);
2792 ext4_li_info = NULL;
2793 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2794 "initialization thread\n",
2798 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2803 * Check whether it make sense to run itable init. thread or not.
2804 * If there is at least one uninitialized inode table, return
2805 * corresponding group number, else the loop goes through all
2806 * groups and return total number of groups.
2808 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2810 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2811 struct ext4_group_desc *gdp = NULL;
2813 for (group = 0; group < ngroups; group++) {
2814 gdp = ext4_get_group_desc(sb, group, NULL);
2818 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2825 static int ext4_li_info_new(void)
2827 struct ext4_lazy_init *eli = NULL;
2829 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2833 INIT_LIST_HEAD(&eli->li_request_list);
2834 mutex_init(&eli->li_list_mtx);
2836 eli->li_state |= EXT4_LAZYINIT_QUIT;
2843 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2846 struct ext4_sb_info *sbi = EXT4_SB(sb);
2847 struct ext4_li_request *elr;
2850 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2856 elr->lr_next_group = start;
2859 * Randomize first schedule time of the request to
2860 * spread the inode table initialization requests
2863 get_random_bytes(&rnd, sizeof(rnd));
2864 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2865 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2870 static int ext4_register_li_request(struct super_block *sb,
2871 ext4_group_t first_not_zeroed)
2873 struct ext4_sb_info *sbi = EXT4_SB(sb);
2874 struct ext4_li_request *elr;
2875 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2878 if (sbi->s_li_request != NULL) {
2880 * Reset timeout so it can be computed again, because
2881 * s_li_wait_mult might have changed.
2883 sbi->s_li_request->lr_timeout = 0;
2887 if (first_not_zeroed == ngroups ||
2888 (sb->s_flags & MS_RDONLY) ||
2889 !test_opt(sb, INIT_INODE_TABLE))
2892 elr = ext4_li_request_new(sb, first_not_zeroed);
2896 mutex_lock(&ext4_li_mtx);
2898 if (NULL == ext4_li_info) {
2899 ret = ext4_li_info_new();
2904 mutex_lock(&ext4_li_info->li_list_mtx);
2905 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2906 mutex_unlock(&ext4_li_info->li_list_mtx);
2908 sbi->s_li_request = elr;
2910 * set elr to NULL here since it has been inserted to
2911 * the request_list and the removal and free of it is
2912 * handled by ext4_clear_request_list from now on.
2916 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2917 ret = ext4_run_lazyinit_thread();
2922 mutex_unlock(&ext4_li_mtx);
2929 * We do not need to lock anything since this is called on
2932 static void ext4_destroy_lazyinit_thread(void)
2935 * If thread exited earlier
2936 * there's nothing to be done.
2938 if (!ext4_li_info || !ext4_lazyinit_task)
2941 kthread_stop(ext4_lazyinit_task);
2944 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2946 char *orig_data = kstrdup(data, GFP_KERNEL);
2947 struct buffer_head *bh;
2948 struct ext4_super_block *es = NULL;
2949 struct ext4_sb_info *sbi;
2951 ext4_fsblk_t sb_block = get_sb_block(&data);
2952 ext4_fsblk_t logical_sb_block;
2953 unsigned long offset = 0;
2954 unsigned long journal_devnum = 0;
2955 unsigned long def_mount_opts;
2960 int blocksize, clustersize;
2961 unsigned int db_count;
2963 int needs_recovery, has_huge_files, has_bigalloc;
2966 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
2967 ext4_group_t first_not_zeroed;
2969 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2973 sbi->s_blockgroup_lock =
2974 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2975 if (!sbi->s_blockgroup_lock) {
2979 sb->s_fs_info = sbi;
2980 sbi->s_mount_opt = 0;
2981 sbi->s_resuid = EXT4_DEF_RESUID;
2982 sbi->s_resgid = EXT4_DEF_RESGID;
2983 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
2984 sbi->s_sb_block = sb_block;
2985 if (sb->s_bdev->bd_part)
2986 sbi->s_sectors_written_start =
2987 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
2989 /* Cleanup superblock name */
2990 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2994 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
2996 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3001 * The ext4 superblock will not be buffer aligned for other than 1kB
3002 * block sizes. We need to calculate the offset from buffer start.
3004 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3005 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3006 offset = do_div(logical_sb_block, blocksize);
3008 logical_sb_block = sb_block;
3011 if (!(bh = sb_bread(sb, logical_sb_block))) {
3012 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3016 * Note: s_es must be initialized as soon as possible because
3017 * some ext4 macro-instructions depend on its value
3019 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3021 sb->s_magic = le16_to_cpu(es->s_magic);
3022 if (sb->s_magic != EXT4_SUPER_MAGIC)
3024 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3026 /* Set defaults before we parse the mount options */
3027 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3028 set_opt(sb, INIT_INODE_TABLE);
3029 if (def_mount_opts & EXT4_DEFM_DEBUG)
3031 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3033 if (def_mount_opts & EXT4_DEFM_UID16)
3034 set_opt(sb, NO_UID32);
3035 /* xattr user namespace & acls are now defaulted on */
3036 #ifdef CONFIG_EXT4_FS_XATTR
3037 set_opt(sb, XATTR_USER);
3039 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3040 set_opt(sb, POSIX_ACL);
3042 set_opt(sb, MBLK_IO_SUBMIT);
3043 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3044 set_opt(sb, JOURNAL_DATA);
3045 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3046 set_opt(sb, ORDERED_DATA);
3047 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3048 set_opt(sb, WRITEBACK_DATA);
3050 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3051 set_opt(sb, ERRORS_PANIC);
3052 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3053 set_opt(sb, ERRORS_CONT);
3055 set_opt(sb, ERRORS_RO);
3056 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3057 set_opt(sb, BLOCK_VALIDITY);
3058 if (def_mount_opts & EXT4_DEFM_DISCARD)
3059 set_opt(sb, DISCARD);
3061 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3062 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
3063 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3064 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3065 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3067 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3068 set_opt(sb, BARRIER);
3071 * enable delayed allocation by default
3072 * Use -o nodelalloc to turn it off
3074 if (!IS_EXT3_SB(sb) &&
3075 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3076 set_opt(sb, DELALLOC);
3079 * set default s_li_wait_mult for lazyinit, for the case there is
3080 * no mount option specified.
3082 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3084 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3085 &journal_devnum, &journal_ioprio, 0)) {
3086 ext4_msg(sb, KERN_WARNING,
3087 "failed to parse options in superblock: %s",
3088 sbi->s_es->s_mount_opts);
3090 sbi->s_def_mount_opt = sbi->s_mount_opt;
3091 if (!parse_options((char *) data, sb, &journal_devnum,
3092 &journal_ioprio, 0))
3095 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3096 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3097 "with data=journal disables delayed "
3098 "allocation and O_DIRECT support!\n");
3099 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3100 ext4_msg(sb, KERN_ERR, "can't mount with "
3101 "both data=journal and delalloc");
3104 if (test_opt(sb, DIOREAD_NOLOCK)) {
3105 ext4_msg(sb, KERN_ERR, "can't mount with "
3106 "both data=journal and delalloc");
3109 if (test_opt(sb, DELALLOC))
3110 clear_opt(sb, DELALLOC);
3113 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3114 if (test_opt(sb, DIOREAD_NOLOCK)) {
3115 if (blocksize < PAGE_SIZE) {
3116 ext4_msg(sb, KERN_ERR, "can't mount with "
3117 "dioread_nolock if block size != PAGE_SIZE");
3122 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3123 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3125 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3126 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3127 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3128 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3129 ext4_msg(sb, KERN_WARNING,
3130 "feature flags set on rev 0 fs, "
3131 "running e2fsck is recommended");
3133 if (IS_EXT2_SB(sb)) {
3134 if (ext2_feature_set_ok(sb))
3135 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3136 "using the ext4 subsystem");
3138 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3139 "to feature incompatibilities");
3144 if (IS_EXT3_SB(sb)) {
3145 if (ext3_feature_set_ok(sb))
3146 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3147 "using the ext4 subsystem");
3149 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3150 "to feature incompatibilities");
3156 * Check feature flags regardless of the revision level, since we
3157 * previously didn't change the revision level when setting the flags,
3158 * so there is a chance incompat flags are set on a rev 0 filesystem.
3160 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3163 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3164 blocksize > EXT4_MAX_BLOCK_SIZE) {
3165 ext4_msg(sb, KERN_ERR,
3166 "Unsupported filesystem blocksize %d", blocksize);
3170 if (sb->s_blocksize != blocksize) {
3171 /* Validate the filesystem blocksize */
3172 if (!sb_set_blocksize(sb, blocksize)) {
3173 ext4_msg(sb, KERN_ERR, "bad block size %d",
3179 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3180 offset = do_div(logical_sb_block, blocksize);
3181 bh = sb_bread(sb, logical_sb_block);
3183 ext4_msg(sb, KERN_ERR,
3184 "Can't read superblock on 2nd try");
3187 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
3189 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3190 ext4_msg(sb, KERN_ERR,
3191 "Magic mismatch, very weird!");
3196 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3197 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3198 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3200 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3202 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3203 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3204 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3206 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3207 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3208 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3209 (!is_power_of_2(sbi->s_inode_size)) ||
3210 (sbi->s_inode_size > blocksize)) {
3211 ext4_msg(sb, KERN_ERR,
3212 "unsupported inode size: %d",
3216 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3217 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3220 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3221 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3222 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3223 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3224 !is_power_of_2(sbi->s_desc_size)) {
3225 ext4_msg(sb, KERN_ERR,
3226 "unsupported descriptor size %lu",
3231 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3233 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3234 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3235 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3238 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3239 if (sbi->s_inodes_per_block == 0)
3241 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3242 sbi->s_inodes_per_block;
3243 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3245 sbi->s_mount_state = le16_to_cpu(es->s_state);
3246 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3247 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3249 for (i = 0; i < 4; i++)
3250 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3251 sbi->s_def_hash_version = es->s_def_hash_version;
3252 i = le32_to_cpu(es->s_flags);
3253 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3254 sbi->s_hash_unsigned = 3;
3255 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3256 #ifdef __CHAR_UNSIGNED__
3257 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3258 sbi->s_hash_unsigned = 3;
3260 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3264 /* Handle clustersize */
3265 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3266 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3267 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3269 if (clustersize < blocksize) {
3270 ext4_msg(sb, KERN_ERR,
3271 "cluster size (%d) smaller than "
3272 "block size (%d)", clustersize, blocksize);
3275 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3276 le32_to_cpu(es->s_log_block_size);
3277 sbi->s_clusters_per_group =
3278 le32_to_cpu(es->s_clusters_per_group);
3279 if (sbi->s_clusters_per_group > blocksize * 8) {
3280 ext4_msg(sb, KERN_ERR,
3281 "#clusters per group too big: %lu",
3282 sbi->s_clusters_per_group);
3285 if (sbi->s_blocks_per_group !=
3286 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3287 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3288 "clusters per group (%lu) inconsistent",
3289 sbi->s_blocks_per_group,
3290 sbi->s_clusters_per_group);
3294 if (clustersize != blocksize) {
3295 ext4_warning(sb, "fragment/cluster size (%d) != "
3296 "block size (%d)", clustersize,
3298 clustersize = blocksize;
3300 if (sbi->s_blocks_per_group > blocksize * 8) {
3301 ext4_msg(sb, KERN_ERR,
3302 "#blocks per group too big: %lu",
3303 sbi->s_blocks_per_group);
3306 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3307 sbi->s_cluster_bits = 0;
3309 sbi->s_cluster_ratio = clustersize / blocksize;
3311 if (sbi->s_inodes_per_group > blocksize * 8) {
3312 ext4_msg(sb, KERN_ERR,
3313 "#inodes per group too big: %lu",
3314 sbi->s_inodes_per_group);
3319 * Test whether we have more sectors than will fit in sector_t,
3320 * and whether the max offset is addressable by the page cache.
3322 err = generic_check_addressable(sb->s_blocksize_bits,
3323 ext4_blocks_count(es));
3325 ext4_msg(sb, KERN_ERR, "filesystem"
3326 " too large to mount safely on this system");
3327 if (sizeof(sector_t) < 8)
3328 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3333 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3336 /* check blocks count against device size */
3337 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3338 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3339 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3340 "exceeds size of device (%llu blocks)",
3341 ext4_blocks_count(es), blocks_count);
3346 * It makes no sense for the first data block to be beyond the end
3347 * of the filesystem.
3349 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3350 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3351 "block %u is beyond end of filesystem (%llu)",
3352 le32_to_cpu(es->s_first_data_block),
3353 ext4_blocks_count(es));
3356 blocks_count = (ext4_blocks_count(es) -
3357 le32_to_cpu(es->s_first_data_block) +
3358 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3359 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3360 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3361 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3362 "(block count %llu, first data block %u, "
3363 "blocks per group %lu)", sbi->s_groups_count,
3364 ext4_blocks_count(es),
3365 le32_to_cpu(es->s_first_data_block),
3366 EXT4_BLOCKS_PER_GROUP(sb));
3369 sbi->s_groups_count = blocks_count;
3370 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3371 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3372 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3373 EXT4_DESC_PER_BLOCK(sb);
3374 sbi->s_group_desc = ext4_kvmalloc(db_count *
3375 sizeof(struct buffer_head *),
3377 if (sbi->s_group_desc == NULL) {
3378 ext4_msg(sb, KERN_ERR, "not enough memory");
3383 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3386 proc_create_data("options", S_IRUGO, sbi->s_proc,
3387 &ext4_seq_options_fops, sb);
3389 bgl_lock_init(sbi->s_blockgroup_lock);
3391 for (i = 0; i < db_count; i++) {
3392 block = descriptor_loc(sb, logical_sb_block, i);
3393 sbi->s_group_desc[i] = sb_bread(sb, block);
3394 if (!sbi->s_group_desc[i]) {
3395 ext4_msg(sb, KERN_ERR,
3396 "can't read group descriptor %d", i);
3401 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3402 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3405 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3406 if (!ext4_fill_flex_info(sb)) {
3407 ext4_msg(sb, KERN_ERR,
3408 "unable to initialize "
3409 "flex_bg meta info!");
3413 sbi->s_gdb_count = db_count;
3414 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3415 spin_lock_init(&sbi->s_next_gen_lock);
3417 init_timer(&sbi->s_err_report);
3418 sbi->s_err_report.function = print_daily_error_info;
3419 sbi->s_err_report.data = (unsigned long) sb;
3421 err = percpu_counter_init(&sbi->s_freeclusters_counter,
3422 ext4_count_free_clusters(sb));
3424 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3425 ext4_count_free_inodes(sb));
3428 err = percpu_counter_init(&sbi->s_dirs_counter,
3429 ext4_count_dirs(sb));
3432 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
3435 ext4_msg(sb, KERN_ERR, "insufficient memory");
3439 sbi->s_stripe = ext4_get_stripe_size(sbi);
3440 sbi->s_max_writeback_mb_bump = 128;
3443 * set up enough so that it can read an inode
3445 if (!test_opt(sb, NOLOAD) &&
3446 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3447 sb->s_op = &ext4_sops;
3449 sb->s_op = &ext4_nojournal_sops;
3450 sb->s_export_op = &ext4_export_ops;
3451 sb->s_xattr = ext4_xattr_handlers;
3453 sb->s_qcop = &ext4_qctl_operations;
3454 sb->dq_op = &ext4_quota_operations;
3456 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3458 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3459 mutex_init(&sbi->s_orphan_lock);
3460 sbi->s_resize_flags = 0;
3464 needs_recovery = (es->s_last_orphan != 0 ||
3465 EXT4_HAS_INCOMPAT_FEATURE(sb,
3466 EXT4_FEATURE_INCOMPAT_RECOVER));
3468 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3469 !(sb->s_flags & MS_RDONLY))
3470 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3474 * The first inode we look at is the journal inode. Don't try
3475 * root first: it may be modified in the journal!
3477 if (!test_opt(sb, NOLOAD) &&
3478 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3479 if (ext4_load_journal(sb, es, journal_devnum))
3481 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3482 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3483 ext4_msg(sb, KERN_ERR, "required journal recovery "
3484 "suppressed and not mounted read-only");
3485 goto failed_mount_wq;
3487 clear_opt(sb, DATA_FLAGS);
3488 sbi->s_journal = NULL;
3493 if (ext4_blocks_count(es) > 0xffffffffULL &&
3494 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3495 JBD2_FEATURE_INCOMPAT_64BIT)) {
3496 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3497 goto failed_mount_wq;
3500 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3501 jbd2_journal_set_features(sbi->s_journal,
3502 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3503 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3504 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3505 jbd2_journal_set_features(sbi->s_journal,
3506 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
3507 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3508 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3510 jbd2_journal_clear_features(sbi->s_journal,
3511 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3512 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3515 /* We have now updated the journal if required, so we can
3516 * validate the data journaling mode. */
3517 switch (test_opt(sb, DATA_FLAGS)) {
3519 /* No mode set, assume a default based on the journal
3520 * capabilities: ORDERED_DATA if the journal can
3521 * cope, else JOURNAL_DATA
3523 if (jbd2_journal_check_available_features
3524 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3525 set_opt(sb, ORDERED_DATA);
3527 set_opt(sb, JOURNAL_DATA);
3530 case EXT4_MOUNT_ORDERED_DATA:
3531 case EXT4_MOUNT_WRITEBACK_DATA:
3532 if (!jbd2_journal_check_available_features
3533 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3534 ext4_msg(sb, KERN_ERR, "Journal does not support "
3535 "requested data journaling mode");
3536 goto failed_mount_wq;
3541 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3543 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3546 * The journal may have updated the bg summary counts, so we
3547 * need to update the global counters.
3549 percpu_counter_set(&sbi->s_freeclusters_counter,
3550 ext4_count_free_clusters(sb));
3551 percpu_counter_set(&sbi->s_freeinodes_counter,
3552 ext4_count_free_inodes(sb));
3553 percpu_counter_set(&sbi->s_dirs_counter,
3554 ext4_count_dirs(sb));
3555 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
3559 * The maximum number of concurrent works can be high and
3560 * concurrency isn't really necessary. Limit it to 1.
3562 EXT4_SB(sb)->dio_unwritten_wq =
3563 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3564 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3565 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3566 goto failed_mount_wq;
3570 * The jbd2_journal_load will have done any necessary log recovery,
3571 * so we can safely mount the rest of the filesystem now.
3574 root = ext4_iget(sb, EXT4_ROOT_INO);
3576 ext4_msg(sb, KERN_ERR, "get root inode failed");
3577 ret = PTR_ERR(root);
3581 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3582 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
3586 sb->s_root = d_make_root(root);
3588 ext4_msg(sb, KERN_ERR, "get root dentry failed");
3593 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
3595 /* determine the minimum size of new large inodes, if present */
3596 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3597 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3598 EXT4_GOOD_OLD_INODE_SIZE;
3599 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3600 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3601 if (sbi->s_want_extra_isize <
3602 le16_to_cpu(es->s_want_extra_isize))
3603 sbi->s_want_extra_isize =
3604 le16_to_cpu(es->s_want_extra_isize);
3605 if (sbi->s_want_extra_isize <
3606 le16_to_cpu(es->s_min_extra_isize))
3607 sbi->s_want_extra_isize =
3608 le16_to_cpu(es->s_min_extra_isize);
3611 /* Check if enough inode space is available */
3612 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3613 sbi->s_inode_size) {
3614 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3615 EXT4_GOOD_OLD_INODE_SIZE;
3616 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3620 err = ext4_setup_system_zone(sb);
3622 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3624 goto failed_mount4a;
3628 err = ext4_mb_init(sb, needs_recovery);
3630 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3635 err = ext4_register_li_request(sb, first_not_zeroed);
3639 sbi->s_kobj.kset = ext4_kset;
3640 init_completion(&sbi->s_kobj_unregister);
3641 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3646 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3647 ext4_orphan_cleanup(sb, es);
3648 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3649 if (needs_recovery) {
3650 ext4_msg(sb, KERN_INFO, "recovery complete");
3651 ext4_mark_recovery_complete(sb, es);
3653 if (EXT4_SB(sb)->s_journal) {
3654 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3655 descr = " journalled data mode";
3656 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3657 descr = " ordered data mode";
3659 descr = " writeback data mode";
3661 descr = "out journal";
3663 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3664 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3665 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
3667 if (es->s_error_count)
3668 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3675 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
3679 ext4_unregister_li_request(sb);
3681 ext4_mb_release(sb);
3683 ext4_ext_release(sb);
3684 ext4_release_system_zone(sb);
3689 ext4_msg(sb, KERN_ERR, "mount failed");
3690 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3692 if (sbi->s_journal) {
3693 jbd2_journal_destroy(sbi->s_journal);
3694 sbi->s_journal = NULL;
3697 del_timer(&sbi->s_err_report);
3698 if (sbi->s_flex_groups)
3699 ext4_kvfree(sbi->s_flex_groups);
3700 percpu_counter_destroy(&sbi->s_freeclusters_counter);
3701 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3702 percpu_counter_destroy(&sbi->s_dirs_counter);
3703 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
3705 kthread_stop(sbi->s_mmp_tsk);
3707 for (i = 0; i < db_count; i++)
3708 brelse(sbi->s_group_desc[i]);
3709 ext4_kvfree(sbi->s_group_desc);
3712 remove_proc_entry("options", sbi->s_proc);
3713 remove_proc_entry(sb->s_id, ext4_proc_root);
3716 for (i = 0; i < MAXQUOTAS; i++)
3717 kfree(sbi->s_qf_names[i]);
3719 ext4_blkdev_remove(sbi);
3722 sb->s_fs_info = NULL;
3723 kfree(sbi->s_blockgroup_lock);
3731 * Setup any per-fs journal parameters now. We'll do this both on
3732 * initial mount, once the journal has been initialised but before we've
3733 * done any recovery; and again on any subsequent remount.
3735 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
3737 struct ext4_sb_info *sbi = EXT4_SB(sb);
3739 journal->j_commit_interval = sbi->s_commit_interval;
3740 journal->j_min_batch_time = sbi->s_min_batch_time;
3741 journal->j_max_batch_time = sbi->s_max_batch_time;
3743 write_lock(&journal->j_state_lock);
3744 if (test_opt(sb, BARRIER))
3745 journal->j_flags |= JBD2_BARRIER;
3747 journal->j_flags &= ~JBD2_BARRIER;
3748 if (test_opt(sb, DATA_ERR_ABORT))
3749 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3751 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
3752 write_unlock(&journal->j_state_lock);
3755 static journal_t *ext4_get_journal(struct super_block *sb,
3756 unsigned int journal_inum)
3758 struct inode *journal_inode;
3761 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3763 /* First, test for the existence of a valid inode on disk. Bad
3764 * things happen if we iget() an unused inode, as the subsequent
3765 * iput() will try to delete it. */
3767 journal_inode = ext4_iget(sb, journal_inum);
3768 if (IS_ERR(journal_inode)) {
3769 ext4_msg(sb, KERN_ERR, "no journal found");
3772 if (!journal_inode->i_nlink) {
3773 make_bad_inode(journal_inode);
3774 iput(journal_inode);
3775 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
3779 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3780 journal_inode, journal_inode->i_size);
3781 if (!S_ISREG(journal_inode->i_mode)) {
3782 ext4_msg(sb, KERN_ERR, "invalid journal inode");
3783 iput(journal_inode);
3787 journal = jbd2_journal_init_inode(journal_inode);
3789 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
3790 iput(journal_inode);
3793 journal->j_private = sb;
3794 ext4_init_journal_params(sb, journal);
3798 static journal_t *ext4_get_dev_journal(struct super_block *sb,
3801 struct buffer_head *bh;
3805 int hblock, blocksize;
3806 ext4_fsblk_t sb_block;
3807 unsigned long offset;
3808 struct ext4_super_block *es;
3809 struct block_device *bdev;
3811 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3813 bdev = ext4_blkdev_get(j_dev, sb);
3817 blocksize = sb->s_blocksize;
3818 hblock = bdev_logical_block_size(bdev);
3819 if (blocksize < hblock) {
3820 ext4_msg(sb, KERN_ERR,
3821 "blocksize too small for journal device");
3825 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3826 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3827 set_blocksize(bdev, blocksize);
3828 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3829 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3830 "external journal");
3834 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3835 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
3836 !(le32_to_cpu(es->s_feature_incompat) &
3837 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3838 ext4_msg(sb, KERN_ERR, "external journal has "
3844 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3845 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
3850 len = ext4_blocks_count(es);
3851 start = sb_block + 1;
3852 brelse(bh); /* we're done with the superblock */
3854 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
3855 start, len, blocksize);
3857 ext4_msg(sb, KERN_ERR, "failed to create device journal");
3860 journal->j_private = sb;
3861 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3862 wait_on_buffer(journal->j_sb_buffer);
3863 if (!buffer_uptodate(journal->j_sb_buffer)) {
3864 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
3867 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
3868 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3869 "user (unsupported) - %d",
3870 be32_to_cpu(journal->j_superblock->s_nr_users));
3873 EXT4_SB(sb)->journal_bdev = bdev;
3874 ext4_init_journal_params(sb, journal);
3878 jbd2_journal_destroy(journal);
3880 ext4_blkdev_put(bdev);
3884 static int ext4_load_journal(struct super_block *sb,
3885 struct ext4_super_block *es,
3886 unsigned long journal_devnum)
3889 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3892 int really_read_only;
3894 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3896 if (journal_devnum &&
3897 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3898 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3899 "numbers have changed");
3900 journal_dev = new_decode_dev(journal_devnum);
3902 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3904 really_read_only = bdev_read_only(sb->s_bdev);
3907 * Are we loading a blank journal or performing recovery after a
3908 * crash? For recovery, we need to check in advance whether we
3909 * can get read-write access to the device.
3911 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3912 if (sb->s_flags & MS_RDONLY) {
3913 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3914 "required on readonly filesystem");
3915 if (really_read_only) {
3916 ext4_msg(sb, KERN_ERR, "write access "
3917 "unavailable, cannot proceed");
3920 ext4_msg(sb, KERN_INFO, "write access will "
3921 "be enabled during recovery");
3925 if (journal_inum && journal_dev) {
3926 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3927 "and inode journals!");
3932 if (!(journal = ext4_get_journal(sb, journal_inum)))
3935 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
3939 if (!(journal->j_flags & JBD2_BARRIER))
3940 ext4_msg(sb, KERN_INFO, "barriers disabled");
3942 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
3943 err = jbd2_journal_wipe(journal, !really_read_only);
3945 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
3947 memcpy(save, ((char *) es) +
3948 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
3949 err = jbd2_journal_load(journal);
3951 memcpy(((char *) es) + EXT4_S_ERR_START,
3952 save, EXT4_S_ERR_LEN);
3957 ext4_msg(sb, KERN_ERR, "error loading journal");
3958 jbd2_journal_destroy(journal);
3962 EXT4_SB(sb)->s_journal = journal;
3963 ext4_clear_journal_err(sb, es);
3965 if (!really_read_only && journal_devnum &&
3966 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3967 es->s_journal_dev = cpu_to_le32(journal_devnum);
3969 /* Make sure we flush the recovery flag to disk. */
3970 ext4_commit_super(sb, 1);
3976 static int ext4_commit_super(struct super_block *sb, int sync)
3978 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3979 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
3982 if (!sbh || block_device_ejected(sb))
3984 if (buffer_write_io_error(sbh)) {
3986 * Oh, dear. A previous attempt to write the
3987 * superblock failed. This could happen because the
3988 * USB device was yanked out. Or it could happen to
3989 * be a transient write error and maybe the block will
3990 * be remapped. Nothing we can do but to retry the
3991 * write and hope for the best.
3993 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3994 "superblock detected");
3995 clear_buffer_write_io_error(sbh);
3996 set_buffer_uptodate(sbh);
3999 * If the file system is mounted read-only, don't update the
4000 * superblock write time. This avoids updating the superblock
4001 * write time when we are mounting the root file system
4002 * read/only but we need to replay the journal; at that point,
4003 * for people who are east of GMT and who make their clock
4004 * tick in localtime for Windows bug-for-bug compatibility,
4005 * the clock is set in the future, and this will cause e2fsck
4006 * to complain and force a full file system check.
4008 if (!(sb->s_flags & MS_RDONLY))
4009 es->s_wtime = cpu_to_le32(get_seconds());
4010 if (sb->s_bdev->bd_part)
4011 es->s_kbytes_written =
4012 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4013 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4014 EXT4_SB(sb)->s_sectors_written_start) >> 1));
4016 es->s_kbytes_written =
4017 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4018 ext4_free_blocks_count_set(es,
4019 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4020 &EXT4_SB(sb)->s_freeclusters_counter)));
4021 es->s_free_inodes_count =
4022 cpu_to_le32(percpu_counter_sum_positive(
4023 &EXT4_SB(sb)->s_freeinodes_counter));
4025 BUFFER_TRACE(sbh, "marking dirty");
4026 mark_buffer_dirty(sbh);
4028 error = sync_dirty_buffer(sbh);
4032 error = buffer_write_io_error(sbh);
4034 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4036 clear_buffer_write_io_error(sbh);
4037 set_buffer_uptodate(sbh);
4044 * Have we just finished recovery? If so, and if we are mounting (or
4045 * remounting) the filesystem readonly, then we will end up with a
4046 * consistent fs on disk. Record that fact.
4048 static void ext4_mark_recovery_complete(struct super_block *sb,
4049 struct ext4_super_block *es)
4051 journal_t *journal = EXT4_SB(sb)->s_journal;
4053 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4054 BUG_ON(journal != NULL);
4057 jbd2_journal_lock_updates(journal);
4058 if (jbd2_journal_flush(journal) < 0)
4061 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4062 sb->s_flags & MS_RDONLY) {
4063 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4064 ext4_commit_super(sb, 1);
4068 jbd2_journal_unlock_updates(journal);
4072 * If we are mounting (or read-write remounting) a filesystem whose journal
4073 * has recorded an error from a previous lifetime, move that error to the
4074 * main filesystem now.
4076 static void ext4_clear_journal_err(struct super_block *sb,
4077 struct ext4_super_block *es)
4083 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4085 journal = EXT4_SB(sb)->s_journal;
4088 * Now check for any error status which may have been recorded in the
4089 * journal by a prior ext4_error() or ext4_abort()
4092 j_errno = jbd2_journal_errno(journal);
4096 errstr = ext4_decode_error(sb, j_errno, nbuf);
4097 ext4_warning(sb, "Filesystem error recorded "
4098 "from previous mount: %s", errstr);
4099 ext4_warning(sb, "Marking fs in need of filesystem check.");
4101 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4102 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4103 ext4_commit_super(sb, 1);
4105 jbd2_journal_clear_err(journal);
4110 * Force the running and committing transactions to commit,
4111 * and wait on the commit.
4113 int ext4_force_commit(struct super_block *sb)
4118 if (sb->s_flags & MS_RDONLY)
4121 journal = EXT4_SB(sb)->s_journal;
4123 vfs_check_frozen(sb, SB_FREEZE_TRANS);
4124 ret = ext4_journal_force_commit(journal);
4130 static void ext4_write_super(struct super_block *sb)
4133 ext4_commit_super(sb, 1);
4137 static int ext4_sync_fs(struct super_block *sb, int wait)
4141 struct ext4_sb_info *sbi = EXT4_SB(sb);
4143 trace_ext4_sync_fs(sb, wait);
4144 flush_workqueue(sbi->dio_unwritten_wq);
4145 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4147 jbd2_log_wait_commit(sbi->s_journal, target);
4153 * LVM calls this function before a (read-only) snapshot is created. This
4154 * gives us a chance to flush the journal completely and mark the fs clean.
4156 * Note that only this function cannot bring a filesystem to be in a clean
4157 * state independently, because ext4 prevents a new handle from being started
4158 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4161 static int ext4_freeze(struct super_block *sb)
4166 if (sb->s_flags & MS_RDONLY)
4169 journal = EXT4_SB(sb)->s_journal;
4171 /* Now we set up the journal barrier. */
4172 jbd2_journal_lock_updates(journal);
4175 * Don't clear the needs_recovery flag if we failed to flush
4178 error = jbd2_journal_flush(journal);
4182 /* Journal blocked and flushed, clear needs_recovery flag. */
4183 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4184 error = ext4_commit_super(sb, 1);
4186 /* we rely on s_frozen to stop further updates */
4187 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4192 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4193 * flag here, even though the filesystem is not technically dirty yet.
4195 static int ext4_unfreeze(struct super_block *sb)
4197 if (sb->s_flags & MS_RDONLY)
4201 /* Reset the needs_recovery flag before the fs is unlocked. */
4202 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4203 ext4_commit_super(sb, 1);
4209 * Structure to save mount options for ext4_remount's benefit
4211 struct ext4_mount_options {
4212 unsigned long s_mount_opt;
4213 unsigned long s_mount_opt2;
4216 unsigned long s_commit_interval;
4217 u32 s_min_batch_time, s_max_batch_time;
4220 char *s_qf_names[MAXQUOTAS];
4224 static int ext4_remount(struct super_block *sb, int *flags, char *data)
4226 struct ext4_super_block *es;
4227 struct ext4_sb_info *sbi = EXT4_SB(sb);
4228 unsigned long old_sb_flags;
4229 struct ext4_mount_options old_opts;
4230 int enable_quota = 0;
4232 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4237 char *orig_data = kstrdup(data, GFP_KERNEL);
4239 /* Store the original options */
4241 old_sb_flags = sb->s_flags;
4242 old_opts.s_mount_opt = sbi->s_mount_opt;
4243 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4244 old_opts.s_resuid = sbi->s_resuid;
4245 old_opts.s_resgid = sbi->s_resgid;
4246 old_opts.s_commit_interval = sbi->s_commit_interval;
4247 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4248 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4250 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4251 for (i = 0; i < MAXQUOTAS; i++)
4252 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4254 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4255 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4258 * Allow the "check" option to be passed as a remount option.
4260 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4265 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4266 ext4_abort(sb, "Abort forced by user");
4268 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4269 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4273 if (sbi->s_journal) {
4274 ext4_init_journal_params(sb, sbi->s_journal);
4275 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4278 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4279 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4284 if (*flags & MS_RDONLY) {
4285 err = dquot_suspend(sb, -1);
4290 * First of all, the unconditional stuff we have to do
4291 * to disable replay of the journal when we next remount
4293 sb->s_flags |= MS_RDONLY;
4296 * OK, test if we are remounting a valid rw partition
4297 * readonly, and if so set the rdonly flag and then
4298 * mark the partition as valid again.
4300 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4301 (sbi->s_mount_state & EXT4_VALID_FS))
4302 es->s_state = cpu_to_le16(sbi->s_mount_state);
4305 ext4_mark_recovery_complete(sb, es);
4307 /* Make sure we can mount this feature set readwrite */
4308 if (!ext4_feature_set_ok(sb, 0)) {
4313 * Make sure the group descriptor checksums
4314 * are sane. If they aren't, refuse to remount r/w.
4316 for (g = 0; g < sbi->s_groups_count; g++) {
4317 struct ext4_group_desc *gdp =
4318 ext4_get_group_desc(sb, g, NULL);
4320 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
4321 ext4_msg(sb, KERN_ERR,
4322 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4323 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4324 le16_to_cpu(gdp->bg_checksum));
4331 * If we have an unprocessed orphan list hanging
4332 * around from a previously readonly bdev mount,
4333 * require a full umount/remount for now.
4335 if (es->s_last_orphan) {
4336 ext4_msg(sb, KERN_WARNING, "Couldn't "
4337 "remount RDWR because of unprocessed "
4338 "orphan inode list. Please "
4339 "umount/remount instead");
4345 * Mounting a RDONLY partition read-write, so reread
4346 * and store the current valid flag. (It may have
4347 * been changed by e2fsck since we originally mounted
4351 ext4_clear_journal_err(sb, es);
4352 sbi->s_mount_state = le16_to_cpu(es->s_state);
4353 if (!ext4_setup_super(sb, es, 0))
4354 sb->s_flags &= ~MS_RDONLY;
4355 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4356 EXT4_FEATURE_INCOMPAT_MMP))
4357 if (ext4_multi_mount_protect(sb,
4358 le64_to_cpu(es->s_mmp_block))) {
4367 * Reinitialize lazy itable initialization thread based on
4370 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4371 ext4_unregister_li_request(sb);
4373 ext4_group_t first_not_zeroed;
4374 first_not_zeroed = ext4_has_uninit_itable(sb);
4375 ext4_register_li_request(sb, first_not_zeroed);
4378 ext4_setup_system_zone(sb);
4379 if (sbi->s_journal == NULL)
4380 ext4_commit_super(sb, 1);
4383 /* Release old quota file names */
4384 for (i = 0; i < MAXQUOTAS; i++)
4385 if (old_opts.s_qf_names[i] &&
4386 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4387 kfree(old_opts.s_qf_names[i]);
4391 dquot_resume(sb, -1);
4393 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4398 sb->s_flags = old_sb_flags;
4399 sbi->s_mount_opt = old_opts.s_mount_opt;
4400 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4401 sbi->s_resuid = old_opts.s_resuid;
4402 sbi->s_resgid = old_opts.s_resgid;
4403 sbi->s_commit_interval = old_opts.s_commit_interval;
4404 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4405 sbi->s_max_batch_time = old_opts.s_max_batch_time;
4407 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4408 for (i = 0; i < MAXQUOTAS; i++) {
4409 if (sbi->s_qf_names[i] &&
4410 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4411 kfree(sbi->s_qf_names[i]);
4412 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4421 * Note: calculating the overhead so we can be compatible with
4422 * historical BSD practice is quite difficult in the face of
4423 * clusters/bigalloc. This is because multiple metadata blocks from
4424 * different block group can end up in the same allocation cluster.
4425 * Calculating the exact overhead in the face of clustered allocation
4426 * requires either O(all block bitmaps) in memory or O(number of block
4427 * groups**2) in time. We will still calculate the superblock for
4428 * older file systems --- and if we come across with a bigalloc file
4429 * system with zero in s_overhead_clusters the estimate will be close to
4430 * correct especially for very large cluster sizes --- but for newer
4431 * file systems, it's better to calculate this figure once at mkfs
4432 * time, and store it in the superblock. If the superblock value is
4433 * present (even for non-bigalloc file systems), we will use it.
4435 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4437 struct super_block *sb = dentry->d_sb;
4438 struct ext4_sb_info *sbi = EXT4_SB(sb);
4439 struct ext4_super_block *es = sbi->s_es;
4440 struct ext4_group_desc *gdp;
4444 if (test_opt(sb, MINIX_DF)) {
4445 sbi->s_overhead_last = 0;
4446 } else if (es->s_overhead_clusters) {
4447 sbi->s_overhead_last = le32_to_cpu(es->s_overhead_clusters);
4448 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
4449 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4450 ext4_fsblk_t overhead = 0;
4453 * Compute the overhead (FS structures). This is constant
4454 * for a given filesystem unless the number of block groups
4455 * changes so we cache the previous value until it does.
4459 * All of the blocks before first_data_block are
4462 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
4465 * Add the overhead found in each block group
4467 for (i = 0; i < ngroups; i++) {
4468 gdp = ext4_get_group_desc(sb, i, NULL);
4469 overhead += ext4_num_overhead_clusters(sb, i, gdp);
4472 sbi->s_overhead_last = overhead;
4474 sbi->s_blocks_last = ext4_blocks_count(es);
4477 buf->f_type = EXT4_SUPER_MAGIC;
4478 buf->f_bsize = sb->s_blocksize;
4479 buf->f_blocks = (ext4_blocks_count(es) -
4480 EXT4_C2B(sbi, sbi->s_overhead_last));
4481 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4482 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4483 /* prevent underflow in case that few free space is available */
4484 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
4485 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4486 if (buf->f_bfree < ext4_r_blocks_count(es))
4488 buf->f_files = le32_to_cpu(es->s_inodes_count);
4489 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4490 buf->f_namelen = EXT4_NAME_LEN;
4491 fsid = le64_to_cpup((void *)es->s_uuid) ^
4492 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4493 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4494 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4499 /* Helper function for writing quotas on sync - we need to start transaction
4500 * before quota file is locked for write. Otherwise the are possible deadlocks:
4501 * Process 1 Process 2
4502 * ext4_create() quota_sync()
4503 * jbd2_journal_start() write_dquot()
4504 * dquot_initialize() down(dqio_mutex)
4505 * down(dqio_mutex) jbd2_journal_start()
4511 static inline struct inode *dquot_to_inode(struct dquot *dquot)
4513 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4516 static int ext4_write_dquot(struct dquot *dquot)
4520 struct inode *inode;
4522 inode = dquot_to_inode(dquot);
4523 handle = ext4_journal_start(inode,
4524 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4526 return PTR_ERR(handle);
4527 ret = dquot_commit(dquot);
4528 err = ext4_journal_stop(handle);
4534 static int ext4_acquire_dquot(struct dquot *dquot)
4539 handle = ext4_journal_start(dquot_to_inode(dquot),
4540 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4542 return PTR_ERR(handle);
4543 ret = dquot_acquire(dquot);
4544 err = ext4_journal_stop(handle);
4550 static int ext4_release_dquot(struct dquot *dquot)
4555 handle = ext4_journal_start(dquot_to_inode(dquot),
4556 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
4557 if (IS_ERR(handle)) {
4558 /* Release dquot anyway to avoid endless cycle in dqput() */
4559 dquot_release(dquot);
4560 return PTR_ERR(handle);
4562 ret = dquot_release(dquot);
4563 err = ext4_journal_stop(handle);
4569 static int ext4_mark_dquot_dirty(struct dquot *dquot)
4571 /* Are we journaling quotas? */
4572 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4573 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
4574 dquot_mark_dquot_dirty(dquot);
4575 return ext4_write_dquot(dquot);
4577 return dquot_mark_dquot_dirty(dquot);
4581 static int ext4_write_info(struct super_block *sb, int type)
4586 /* Data block + inode block */
4587 handle = ext4_journal_start(sb->s_root->d_inode, 2);
4589 return PTR_ERR(handle);
4590 ret = dquot_commit_info(sb, type);
4591 err = ext4_journal_stop(handle);
4598 * Turn on quotas during mount time - we need to find
4599 * the quota file and such...
4601 static int ext4_quota_on_mount(struct super_block *sb, int type)
4603 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4604 EXT4_SB(sb)->s_jquota_fmt, type);
4608 * Standard function to be called on quota_on
4610 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
4615 if (!test_opt(sb, QUOTA))
4618 /* Quotafile not on the same filesystem? */
4619 if (path->dentry->d_sb != sb)
4621 /* Journaling quota? */
4622 if (EXT4_SB(sb)->s_qf_names[type]) {
4623 /* Quotafile not in fs root? */
4624 if (path->dentry->d_parent != sb->s_root)
4625 ext4_msg(sb, KERN_WARNING,
4626 "Quota file not on filesystem root. "
4627 "Journaled quota will not work");
4631 * When we journal data on quota file, we have to flush journal to see
4632 * all updates to the file when we bypass pagecache...
4634 if (EXT4_SB(sb)->s_journal &&
4635 ext4_should_journal_data(path->dentry->d_inode)) {
4637 * We don't need to lock updates but journal_flush() could
4638 * otherwise be livelocked...
4640 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
4641 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
4642 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4647 return dquot_quota_on(sb, type, format_id, path);
4650 static int ext4_quota_off(struct super_block *sb, int type)
4652 struct inode *inode = sb_dqopt(sb)->files[type];
4655 /* Force all delayed allocation blocks to be allocated.
4656 * Caller already holds s_umount sem */
4657 if (test_opt(sb, DELALLOC))
4658 sync_filesystem(sb);
4663 /* Update modification times of quota files when userspace can
4664 * start looking at them */
4665 handle = ext4_journal_start(inode, 1);
4668 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4669 ext4_mark_inode_dirty(handle, inode);
4670 ext4_journal_stop(handle);
4673 return dquot_quota_off(sb, type);
4676 /* Read data from quotafile - avoid pagecache and such because we cannot afford
4677 * acquiring the locks... As quota files are never truncated and quota code
4678 * itself serializes the operations (and no one else should touch the files)
4679 * we don't have to be afraid of races */
4680 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
4681 size_t len, loff_t off)
4683 struct inode *inode = sb_dqopt(sb)->files[type];
4684 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4686 int offset = off & (sb->s_blocksize - 1);
4689 struct buffer_head *bh;
4690 loff_t i_size = i_size_read(inode);
4694 if (off+len > i_size)
4697 while (toread > 0) {
4698 tocopy = sb->s_blocksize - offset < toread ?
4699 sb->s_blocksize - offset : toread;
4700 bh = ext4_bread(NULL, inode, blk, 0, &err);
4703 if (!bh) /* A hole? */
4704 memset(data, 0, tocopy);
4706 memcpy(data, bh->b_data+offset, tocopy);
4716 /* Write to quotafile (we know the transaction is already started and has
4717 * enough credits) */
4718 static ssize_t ext4_quota_write(struct super_block *sb, int type,
4719 const char *data, size_t len, loff_t off)
4721 struct inode *inode = sb_dqopt(sb)->files[type];
4722 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4724 int offset = off & (sb->s_blocksize - 1);
4725 struct buffer_head *bh;
4726 handle_t *handle = journal_current_handle();
4728 if (EXT4_SB(sb)->s_journal && !handle) {
4729 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4730 " cancelled because transaction is not started",
4731 (unsigned long long)off, (unsigned long long)len);
4735 * Since we account only one data block in transaction credits,
4736 * then it is impossible to cross a block boundary.
4738 if (sb->s_blocksize - offset < len) {
4739 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4740 " cancelled because not block aligned",
4741 (unsigned long long)off, (unsigned long long)len);
4745 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
4746 bh = ext4_bread(handle, inode, blk, 1, &err);
4749 err = ext4_journal_get_write_access(handle, bh);
4755 memcpy(bh->b_data+offset, data, len);
4756 flush_dcache_page(bh->b_page);
4758 err = ext4_handle_dirty_metadata(handle, NULL, bh);
4762 mutex_unlock(&inode->i_mutex);
4765 if (inode->i_size < off + len) {
4766 i_size_write(inode, off + len);
4767 EXT4_I(inode)->i_disksize = inode->i_size;
4768 ext4_mark_inode_dirty(handle, inode);
4770 mutex_unlock(&inode->i_mutex);
4776 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4777 const char *dev_name, void *data)
4779 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
4782 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4783 static inline void register_as_ext2(void)
4785 int err = register_filesystem(&ext2_fs_type);
4788 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4791 static inline void unregister_as_ext2(void)
4793 unregister_filesystem(&ext2_fs_type);
4796 static inline int ext2_feature_set_ok(struct super_block *sb)
4798 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
4800 if (sb->s_flags & MS_RDONLY)
4802 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
4806 MODULE_ALIAS("ext2");
4808 static inline void register_as_ext2(void) { }
4809 static inline void unregister_as_ext2(void) { }
4810 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
4813 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4814 static inline void register_as_ext3(void)
4816 int err = register_filesystem(&ext3_fs_type);
4819 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4822 static inline void unregister_as_ext3(void)
4824 unregister_filesystem(&ext3_fs_type);
4827 static inline int ext3_feature_set_ok(struct super_block *sb)
4829 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
4831 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
4833 if (sb->s_flags & MS_RDONLY)
4835 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
4839 MODULE_ALIAS("ext3");
4841 static inline void register_as_ext3(void) { }
4842 static inline void unregister_as_ext3(void) { }
4843 static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
4846 static struct file_system_type ext4_fs_type = {
4847 .owner = THIS_MODULE,
4849 .mount = ext4_mount,
4850 .kill_sb = kill_block_super,
4851 .fs_flags = FS_REQUIRES_DEV,
4854 static int __init ext4_init_feat_adverts(void)
4856 struct ext4_features *ef;
4859 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4863 ef->f_kobj.kset = ext4_kset;
4864 init_completion(&ef->f_kobj_unregister);
4865 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4878 static void ext4_exit_feat_adverts(void)
4880 kobject_put(&ext4_feat->f_kobj);
4881 wait_for_completion(&ext4_feat->f_kobj_unregister);
4885 /* Shared across all ext4 file systems */
4886 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
4887 struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
4889 static int __init ext4_init_fs(void)
4893 ext4_li_info = NULL;
4894 mutex_init(&ext4_li_mtx);
4896 ext4_check_flag_values();
4898 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
4899 mutex_init(&ext4__aio_mutex[i]);
4900 init_waitqueue_head(&ext4__ioend_wq[i]);
4903 err = ext4_init_pageio();
4906 err = ext4_init_system_zone();
4909 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4912 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
4914 err = ext4_init_feat_adverts();
4918 err = ext4_init_mballoc();
4922 err = ext4_init_xattr();
4925 err = init_inodecache();
4930 err = register_filesystem(&ext4_fs_type);
4936 unregister_as_ext2();
4937 unregister_as_ext3();
4938 destroy_inodecache();
4942 ext4_exit_mballoc();
4944 ext4_exit_feat_adverts();
4947 remove_proc_entry("fs/ext4", NULL);
4948 kset_unregister(ext4_kset);
4950 ext4_exit_system_zone();
4956 static void __exit ext4_exit_fs(void)
4958 ext4_destroy_lazyinit_thread();
4959 unregister_as_ext2();
4960 unregister_as_ext3();
4961 unregister_filesystem(&ext4_fs_type);
4962 destroy_inodecache();
4964 ext4_exit_mballoc();
4965 ext4_exit_feat_adverts();
4966 remove_proc_entry("fs/ext4", NULL);
4967 kset_unregister(ext4_kset);
4968 ext4_exit_system_zone();
4972 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4973 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4974 MODULE_LICENSE("GPL");
4975 module_init(ext4_init_fs)
4976 module_exit(ext4_exit_fs)