2 * linux/fs/ext3/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/config.h>
20 #include <linux/module.h>
21 #include <linux/string.h>
23 #include <linux/time.h>
24 #include <linux/jbd.h>
25 #include <linux/ext3_fs.h>
26 #include <linux/ext3_jbd.h>
27 #include <linux/slab.h>
28 #include <linux/init.h>
29 #include <linux/blkdev.h>
30 #include <linux/parser.h>
31 #include <linux/smp_lock.h>
32 #include <linux/buffer_head.h>
33 #include <linux/vfs.h>
34 #include <linux/random.h>
35 #include <linux/mount.h>
36 #include <linux/namei.h>
37 #include <linux/quotaops.h>
38 #include <linux/seq_file.h>
40 #include <asm/uaccess.h>
46 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
47 unsigned long journal_devnum);
48 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
50 static void ext3_commit_super (struct super_block * sb,
51 struct ext3_super_block * es,
53 static void ext3_mark_recovery_complete(struct super_block * sb,
54 struct ext3_super_block * es);
55 static void ext3_clear_journal_err(struct super_block * sb,
56 struct ext3_super_block * es);
57 static int ext3_sync_fs(struct super_block *sb, int wait);
58 static const char *ext3_decode_error(struct super_block * sb, int errno,
60 static int ext3_remount (struct super_block * sb, int * flags, char * data);
61 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
62 static void ext3_unlockfs(struct super_block *sb);
63 static void ext3_write_super (struct super_block * sb);
64 static void ext3_write_super_lockfs(struct super_block *sb);
67 * Wrappers for journal_start/end.
69 * The only special thing we need to do here is to make sure that all
70 * journal_end calls result in the superblock being marked dirty, so
71 * that sync() will call the filesystem's write_super callback if
74 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
78 if (sb->s_flags & MS_RDONLY)
79 return ERR_PTR(-EROFS);
81 /* Special case here: if the journal has aborted behind our
82 * backs (eg. EIO in the commit thread), then we still need to
83 * take the FS itself readonly cleanly. */
84 journal = EXT3_SB(sb)->s_journal;
85 if (is_journal_aborted(journal)) {
86 ext3_abort(sb, __FUNCTION__,
87 "Detected aborted journal");
88 return ERR_PTR(-EROFS);
91 return journal_start(journal, nblocks);
95 * The only special thing we need to do here is to make sure that all
96 * journal_stop calls result in the superblock being marked dirty, so
97 * that sync() will call the filesystem's write_super callback if
100 int __ext3_journal_stop(const char *where, handle_t *handle)
102 struct super_block *sb;
106 sb = handle->h_transaction->t_journal->j_private;
108 rc = journal_stop(handle);
113 __ext3_std_error(sb, where, err);
117 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
118 struct buffer_head *bh, handle_t *handle, int err)
121 const char *errstr = ext3_decode_error(NULL, err, nbuf);
124 BUFFER_TRACE(bh, "abort");
129 if (is_handle_aborted(handle))
132 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
133 caller, errstr, err_fn);
135 journal_abort_handle(handle);
138 /* Deal with the reporting of failure conditions on a filesystem such as
139 * inconsistencies detected or read IO failures.
141 * On ext2, we can store the error state of the filesystem in the
142 * superblock. That is not possible on ext3, because we may have other
143 * write ordering constraints on the superblock which prevent us from
144 * writing it out straight away; and given that the journal is about to
145 * be aborted, we can't rely on the current, or future, transactions to
146 * write out the superblock safely.
148 * We'll just use the journal_abort() error code to record an error in
149 * the journal instead. On recovery, the journal will compain about
150 * that error until we've noted it down and cleared it.
153 static void ext3_handle_error(struct super_block *sb)
155 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
157 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
158 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
160 if (sb->s_flags & MS_RDONLY)
163 if (test_opt (sb, ERRORS_RO)) {
164 printk (KERN_CRIT "Remounting filesystem read-only\n");
165 sb->s_flags |= MS_RDONLY;
167 journal_t *journal = EXT3_SB(sb)->s_journal;
169 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
171 journal_abort(journal, -EIO);
173 if (test_opt(sb, ERRORS_PANIC))
174 panic("EXT3-fs (device %s): panic forced after error\n",
176 ext3_commit_super(sb, es, 1);
179 void ext3_error (struct super_block * sb, const char * function,
180 const char * fmt, ...)
185 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
190 ext3_handle_error(sb);
193 static const char *ext3_decode_error(struct super_block * sb, int errno,
200 errstr = "IO failure";
203 errstr = "Out of memory";
206 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
207 errstr = "Journal has aborted";
209 errstr = "Readonly filesystem";
212 /* If the caller passed in an extra buffer for unknown
213 * errors, textualise them now. Else we just return
216 /* Check for truncated error codes... */
217 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
226 /* __ext3_std_error decodes expected errors from journaling functions
227 * automatically and invokes the appropriate error response. */
229 void __ext3_std_error (struct super_block * sb, const char * function,
235 /* Special case: if the error is EROFS, and we're not already
236 * inside a transaction, then there's really no point in logging
238 if (errno == -EROFS && journal_current_handle() == NULL &&
239 (sb->s_flags & MS_RDONLY))
242 errstr = ext3_decode_error(sb, errno, nbuf);
243 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
244 sb->s_id, function, errstr);
246 ext3_handle_error(sb);
250 * ext3_abort is a much stronger failure handler than ext3_error. The
251 * abort function may be used to deal with unrecoverable failures such
252 * as journal IO errors or ENOMEM at a critical moment in log management.
254 * We unconditionally force the filesystem into an ABORT|READONLY state,
255 * unless the error response on the fs has been set to panic in which
256 * case we take the easy way out and panic immediately.
259 void ext3_abort (struct super_block * sb, const char * function,
260 const char * fmt, ...)
264 printk (KERN_CRIT "ext3_abort called.\n");
267 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
272 if (test_opt(sb, ERRORS_PANIC))
273 panic("EXT3-fs panic from previous error\n");
275 if (sb->s_flags & MS_RDONLY)
278 printk(KERN_CRIT "Remounting filesystem read-only\n");
279 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
280 sb->s_flags |= MS_RDONLY;
281 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
282 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
285 void ext3_warning (struct super_block * sb, const char * function,
286 const char * fmt, ...)
291 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
298 void ext3_update_dynamic_rev(struct super_block *sb)
300 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
302 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
305 ext3_warning(sb, __FUNCTION__,
306 "updating to rev %d because of new feature flag, "
307 "running e2fsck is recommended",
310 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
311 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
312 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
313 /* leave es->s_feature_*compat flags alone */
314 /* es->s_uuid will be set by e2fsck if empty */
317 * The rest of the superblock fields should be zero, and if not it
318 * means they are likely already in use, so leave them alone. We
319 * can leave it up to e2fsck to clean up any inconsistencies there.
324 * Open the external journal device
326 static struct block_device *ext3_blkdev_get(dev_t dev)
328 struct block_device *bdev;
329 char b[BDEVNAME_SIZE];
331 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
337 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
338 __bdevname(dev, b), PTR_ERR(bdev));
343 * Release the journal device
345 static int ext3_blkdev_put(struct block_device *bdev)
348 return blkdev_put(bdev);
351 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
353 struct block_device *bdev;
356 bdev = sbi->journal_bdev;
358 ret = ext3_blkdev_put(bdev);
359 sbi->journal_bdev = NULL;
364 static inline struct inode *orphan_list_entry(struct list_head *l)
366 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
369 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
373 printk(KERN_ERR "sb orphan head is %d\n",
374 le32_to_cpu(sbi->s_es->s_last_orphan));
376 printk(KERN_ERR "sb_info orphan list:\n");
377 list_for_each(l, &sbi->s_orphan) {
378 struct inode *inode = orphan_list_entry(l);
380 "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
381 inode->i_sb->s_id, inode->i_ino, inode,
382 inode->i_mode, inode->i_nlink,
387 static void ext3_put_super (struct super_block * sb)
389 struct ext3_sb_info *sbi = EXT3_SB(sb);
390 struct ext3_super_block *es = sbi->s_es;
393 ext3_xattr_put_super(sb);
394 journal_destroy(sbi->s_journal);
395 if (!(sb->s_flags & MS_RDONLY)) {
396 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
397 es->s_state = cpu_to_le16(sbi->s_mount_state);
398 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
399 mark_buffer_dirty(sbi->s_sbh);
400 ext3_commit_super(sb, es, 1);
403 for (i = 0; i < sbi->s_gdb_count; i++)
404 brelse(sbi->s_group_desc[i]);
405 kfree(sbi->s_group_desc);
406 percpu_counter_destroy(&sbi->s_freeblocks_counter);
407 percpu_counter_destroy(&sbi->s_freeinodes_counter);
408 percpu_counter_destroy(&sbi->s_dirs_counter);
411 for (i = 0; i < MAXQUOTAS; i++)
412 kfree(sbi->s_qf_names[i]);
415 /* Debugging code just in case the in-memory inode orphan list
416 * isn't empty. The on-disk one can be non-empty if we've
417 * detected an error and taken the fs readonly, but the
418 * in-memory list had better be clean by this point. */
419 if (!list_empty(&sbi->s_orphan))
420 dump_orphan_list(sb, sbi);
421 J_ASSERT(list_empty(&sbi->s_orphan));
423 invalidate_bdev(sb->s_bdev, 0);
424 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
426 * Invalidate the journal device's buffers. We don't want them
427 * floating about in memory - the physical journal device may
428 * hotswapped, and it breaks the `ro-after' testing code.
430 sync_blockdev(sbi->journal_bdev);
431 invalidate_bdev(sbi->journal_bdev, 0);
432 ext3_blkdev_remove(sbi);
434 sb->s_fs_info = NULL;
439 static kmem_cache_t *ext3_inode_cachep;
442 * Called inside transaction, so use GFP_NOFS
444 static struct inode *ext3_alloc_inode(struct super_block *sb)
446 struct ext3_inode_info *ei;
448 ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
451 #ifdef CONFIG_EXT3_FS_POSIX_ACL
452 ei->i_acl = EXT3_ACL_NOT_CACHED;
453 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
455 ei->i_block_alloc_info = NULL;
456 ei->vfs_inode.i_version = 1;
457 return &ei->vfs_inode;
460 static void ext3_destroy_inode(struct inode *inode)
462 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
465 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
467 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
469 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
470 SLAB_CTOR_CONSTRUCTOR) {
471 INIT_LIST_HEAD(&ei->i_orphan);
472 #ifdef CONFIG_EXT3_FS_XATTR
473 init_rwsem(&ei->xattr_sem);
475 mutex_init(&ei->truncate_mutex);
476 inode_init_once(&ei->vfs_inode);
480 static int init_inodecache(void)
482 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
483 sizeof(struct ext3_inode_info),
484 0, (SLAB_RECLAIM_ACCOUNT|
487 if (ext3_inode_cachep == NULL)
492 static void destroy_inodecache(void)
494 if (kmem_cache_destroy(ext3_inode_cachep))
495 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
498 static void ext3_clear_inode(struct inode *inode)
500 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
501 #ifdef CONFIG_EXT3_FS_POSIX_ACL
502 if (EXT3_I(inode)->i_acl &&
503 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
504 posix_acl_release(EXT3_I(inode)->i_acl);
505 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
507 if (EXT3_I(inode)->i_default_acl &&
508 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
509 posix_acl_release(EXT3_I(inode)->i_default_acl);
510 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
513 ext3_discard_reservation(inode);
514 EXT3_I(inode)->i_block_alloc_info = NULL;
519 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
521 #if defined(CONFIG_QUOTA)
522 struct ext3_sb_info *sbi = EXT3_SB(sb);
524 if (sbi->s_jquota_fmt)
525 seq_printf(seq, ",jqfmt=%s",
526 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
528 if (sbi->s_qf_names[USRQUOTA])
529 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
531 if (sbi->s_qf_names[GRPQUOTA])
532 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
534 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
535 seq_puts(seq, ",usrquota");
537 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
538 seq_puts(seq, ",grpquota");
542 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
544 struct super_block *sb = vfs->mnt_sb;
546 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
547 seq_puts(seq, ",data=journal");
548 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
549 seq_puts(seq, ",data=ordered");
550 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
551 seq_puts(seq, ",data=writeback");
553 ext3_show_quota_options(seq, sb);
559 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
560 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
562 static int ext3_dquot_initialize(struct inode *inode, int type);
563 static int ext3_dquot_drop(struct inode *inode);
564 static int ext3_write_dquot(struct dquot *dquot);
565 static int ext3_acquire_dquot(struct dquot *dquot);
566 static int ext3_release_dquot(struct dquot *dquot);
567 static int ext3_mark_dquot_dirty(struct dquot *dquot);
568 static int ext3_write_info(struct super_block *sb, int type);
569 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
570 static int ext3_quota_on_mount(struct super_block *sb, int type);
571 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
572 size_t len, loff_t off);
573 static ssize_t ext3_quota_write(struct super_block *sb, int type,
574 const char *data, size_t len, loff_t off);
576 static struct dquot_operations ext3_quota_operations = {
577 .initialize = ext3_dquot_initialize,
578 .drop = ext3_dquot_drop,
579 .alloc_space = dquot_alloc_space,
580 .alloc_inode = dquot_alloc_inode,
581 .free_space = dquot_free_space,
582 .free_inode = dquot_free_inode,
583 .transfer = dquot_transfer,
584 .write_dquot = ext3_write_dquot,
585 .acquire_dquot = ext3_acquire_dquot,
586 .release_dquot = ext3_release_dquot,
587 .mark_dirty = ext3_mark_dquot_dirty,
588 .write_info = ext3_write_info
591 static struct quotactl_ops ext3_qctl_operations = {
592 .quota_on = ext3_quota_on,
593 .quota_off = vfs_quota_off,
594 .quota_sync = vfs_quota_sync,
595 .get_info = vfs_get_dqinfo,
596 .set_info = vfs_set_dqinfo,
597 .get_dqblk = vfs_get_dqblk,
598 .set_dqblk = vfs_set_dqblk
602 static struct super_operations ext3_sops = {
603 .alloc_inode = ext3_alloc_inode,
604 .destroy_inode = ext3_destroy_inode,
605 .read_inode = ext3_read_inode,
606 .write_inode = ext3_write_inode,
607 .dirty_inode = ext3_dirty_inode,
608 .delete_inode = ext3_delete_inode,
609 .put_super = ext3_put_super,
610 .write_super = ext3_write_super,
611 .sync_fs = ext3_sync_fs,
612 .write_super_lockfs = ext3_write_super_lockfs,
613 .unlockfs = ext3_unlockfs,
614 .statfs = ext3_statfs,
615 .remount_fs = ext3_remount,
616 .clear_inode = ext3_clear_inode,
617 .show_options = ext3_show_options,
619 .quota_read = ext3_quota_read,
620 .quota_write = ext3_quota_write,
624 static struct export_operations ext3_export_ops = {
625 .get_parent = ext3_get_parent,
629 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
630 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
631 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
632 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
633 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,
634 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
635 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
636 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
637 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
638 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
642 static match_table_t tokens = {
643 {Opt_bsd_df, "bsddf"},
644 {Opt_minix_df, "minixdf"},
645 {Opt_grpid, "grpid"},
646 {Opt_grpid, "bsdgroups"},
647 {Opt_nogrpid, "nogrpid"},
648 {Opt_nogrpid, "sysvgroups"},
649 {Opt_resgid, "resgid=%u"},
650 {Opt_resuid, "resuid=%u"},
652 {Opt_err_cont, "errors=continue"},
653 {Opt_err_panic, "errors=panic"},
654 {Opt_err_ro, "errors=remount-ro"},
655 {Opt_nouid32, "nouid32"},
656 {Opt_nocheck, "nocheck"},
657 {Opt_nocheck, "check=none"},
658 {Opt_debug, "debug"},
659 {Opt_oldalloc, "oldalloc"},
660 {Opt_orlov, "orlov"},
661 {Opt_user_xattr, "user_xattr"},
662 {Opt_nouser_xattr, "nouser_xattr"},
664 {Opt_noacl, "noacl"},
665 {Opt_reservation, "reservation"},
666 {Opt_noreservation, "noreservation"},
667 {Opt_noload, "noload"},
669 {Opt_commit, "commit=%u"},
670 {Opt_journal_update, "journal=update"},
671 {Opt_journal_inum, "journal=%u"},
672 {Opt_journal_dev, "journal_dev=%u"},
673 {Opt_abort, "abort"},
674 {Opt_data_journal, "data=journal"},
675 {Opt_data_ordered, "data=ordered"},
676 {Opt_data_writeback, "data=writeback"},
677 {Opt_offusrjquota, "usrjquota="},
678 {Opt_usrjquota, "usrjquota=%s"},
679 {Opt_offgrpjquota, "grpjquota="},
680 {Opt_grpjquota, "grpjquota=%s"},
681 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
682 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
683 {Opt_grpquota, "grpquota"},
684 {Opt_noquota, "noquota"},
685 {Opt_quota, "quota"},
686 {Opt_usrquota, "usrquota"},
687 {Opt_barrier, "barrier=%u"},
689 {Opt_resize, "resize"},
692 static unsigned long get_sb_block(void **data)
694 unsigned long sb_block;
695 char *options = (char *) *data;
697 if (!options || strncmp(options, "sb=", 3) != 0)
698 return 1; /* Default location */
700 sb_block = simple_strtoul(options, &options, 0);
701 if (*options && *options != ',') {
702 printk("EXT3-fs: Invalid sb specification: %s\n",
708 *data = (void *) options;
712 static int parse_options (char *options, struct super_block *sb,
713 unsigned long *inum, unsigned long *journal_devnum,
714 unsigned long *n_blocks_count, int is_remount)
716 struct ext3_sb_info *sbi = EXT3_SB(sb);
718 substring_t args[MAX_OPT_ARGS];
729 while ((p = strsep (&options, ",")) != NULL) {
734 token = match_token(p, tokens, args);
737 clear_opt (sbi->s_mount_opt, MINIX_DF);
740 set_opt (sbi->s_mount_opt, MINIX_DF);
743 set_opt (sbi->s_mount_opt, GRPID);
746 clear_opt (sbi->s_mount_opt, GRPID);
749 if (match_int(&args[0], &option))
751 sbi->s_resuid = option;
754 if (match_int(&args[0], &option))
756 sbi->s_resgid = option;
759 /* handled by get_sb_block() instead of here */
760 /* *sb_block = match_int(&args[0]); */
763 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
764 clear_opt (sbi->s_mount_opt, ERRORS_RO);
765 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
768 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
769 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
770 set_opt (sbi->s_mount_opt, ERRORS_RO);
773 clear_opt (sbi->s_mount_opt, ERRORS_RO);
774 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
775 set_opt (sbi->s_mount_opt, ERRORS_CONT);
778 set_opt (sbi->s_mount_opt, NO_UID32);
781 clear_opt (sbi->s_mount_opt, CHECK);
784 set_opt (sbi->s_mount_opt, DEBUG);
787 set_opt (sbi->s_mount_opt, OLDALLOC);
790 clear_opt (sbi->s_mount_opt, OLDALLOC);
792 #ifdef CONFIG_EXT3_FS_XATTR
794 set_opt (sbi->s_mount_opt, XATTR_USER);
796 case Opt_nouser_xattr:
797 clear_opt (sbi->s_mount_opt, XATTR_USER);
801 case Opt_nouser_xattr:
802 printk("EXT3 (no)user_xattr options not supported\n");
805 #ifdef CONFIG_EXT3_FS_POSIX_ACL
807 set_opt(sbi->s_mount_opt, POSIX_ACL);
810 clear_opt(sbi->s_mount_opt, POSIX_ACL);
815 printk("EXT3 (no)acl options not supported\n");
818 case Opt_reservation:
819 set_opt(sbi->s_mount_opt, RESERVATION);
821 case Opt_noreservation:
822 clear_opt(sbi->s_mount_opt, RESERVATION);
824 case Opt_journal_update:
826 /* Eventually we will want to be able to create
827 a journal file here. For now, only allow the
828 user to specify an existing inode to be the
831 printk(KERN_ERR "EXT3-fs: cannot specify "
832 "journal on remount\n");
835 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
837 case Opt_journal_inum:
839 printk(KERN_ERR "EXT3-fs: cannot specify "
840 "journal on remount\n");
843 if (match_int(&args[0], &option))
847 case Opt_journal_dev:
849 printk(KERN_ERR "EXT3-fs: cannot specify "
850 "journal on remount\n");
853 if (match_int(&args[0], &option))
855 *journal_devnum = option;
858 set_opt (sbi->s_mount_opt, NOLOAD);
861 if (match_int(&args[0], &option))
866 option = JBD_DEFAULT_MAX_COMMIT_AGE;
867 sbi->s_commit_interval = HZ * option;
869 case Opt_data_journal:
870 data_opt = EXT3_MOUNT_JOURNAL_DATA;
872 case Opt_data_ordered:
873 data_opt = EXT3_MOUNT_ORDERED_DATA;
875 case Opt_data_writeback:
876 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
879 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
882 "EXT3-fs: cannot change data "
883 "mode on remount\n");
887 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
888 sbi->s_mount_opt |= data_opt;
898 if (sb_any_quota_enabled(sb)) {
900 "EXT3-fs: Cannot change journalled "
901 "quota options when quota turned on.\n");
904 qname = match_strdup(&args[0]);
907 "EXT3-fs: not enough memory for "
908 "storing quotafile name.\n");
911 if (sbi->s_qf_names[qtype] &&
912 strcmp(sbi->s_qf_names[qtype], qname)) {
914 "EXT3-fs: %s quota file already "
915 "specified.\n", QTYPE2NAME(qtype));
919 sbi->s_qf_names[qtype] = qname;
920 if (strchr(sbi->s_qf_names[qtype], '/')) {
922 "EXT3-fs: quotafile must be on "
923 "filesystem root.\n");
924 kfree(sbi->s_qf_names[qtype]);
925 sbi->s_qf_names[qtype] = NULL;
928 set_opt(sbi->s_mount_opt, QUOTA);
930 case Opt_offusrjquota:
933 case Opt_offgrpjquota:
936 if (sb_any_quota_enabled(sb)) {
937 printk(KERN_ERR "EXT3-fs: Cannot change "
938 "journalled quota options when "
939 "quota turned on.\n");
943 * The space will be released later when all options
944 * are confirmed to be correct
946 sbi->s_qf_names[qtype] = NULL;
948 case Opt_jqfmt_vfsold:
949 sbi->s_jquota_fmt = QFMT_VFS_OLD;
951 case Opt_jqfmt_vfsv0:
952 sbi->s_jquota_fmt = QFMT_VFS_V0;
956 set_opt(sbi->s_mount_opt, QUOTA);
957 set_opt(sbi->s_mount_opt, USRQUOTA);
960 set_opt(sbi->s_mount_opt, QUOTA);
961 set_opt(sbi->s_mount_opt, GRPQUOTA);
964 if (sb_any_quota_enabled(sb)) {
965 printk(KERN_ERR "EXT3-fs: Cannot change quota "
966 "options when quota turned on.\n");
969 clear_opt(sbi->s_mount_opt, QUOTA);
970 clear_opt(sbi->s_mount_opt, USRQUOTA);
971 clear_opt(sbi->s_mount_opt, GRPQUOTA);
979 case Opt_offusrjquota:
980 case Opt_offgrpjquota:
981 case Opt_jqfmt_vfsold:
982 case Opt_jqfmt_vfsv0:
984 "EXT3-fs: journalled quota options not "
991 set_opt(sbi->s_mount_opt, ABORT);
994 if (match_int(&args[0], &option))
997 set_opt(sbi->s_mount_opt, BARRIER);
999 clear_opt(sbi->s_mount_opt, BARRIER);
1005 printk("EXT3-fs: resize option only available "
1009 if (match_int(&args[0], &option) != 0)
1011 *n_blocks_count = option;
1014 set_opt(sbi->s_mount_opt, NOBH);
1018 "EXT3-fs: Unrecognized mount option \"%s\" "
1019 "or missing value\n", p);
1024 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1025 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1026 sbi->s_qf_names[USRQUOTA])
1027 clear_opt(sbi->s_mount_opt, USRQUOTA);
1029 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1030 sbi->s_qf_names[GRPQUOTA])
1031 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1033 if ((sbi->s_qf_names[USRQUOTA] &&
1034 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1035 (sbi->s_qf_names[GRPQUOTA] &&
1036 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1037 printk(KERN_ERR "EXT3-fs: old and new quota "
1038 "format mixing.\n");
1042 if (!sbi->s_jquota_fmt) {
1043 printk(KERN_ERR "EXT3-fs: journalled quota format "
1044 "not specified.\n");
1048 if (sbi->s_jquota_fmt) {
1049 printk(KERN_ERR "EXT3-fs: journalled quota format "
1050 "specified with no journalling "
1059 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1062 struct ext3_sb_info *sbi = EXT3_SB(sb);
1065 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1066 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1067 "forcing read-only mode\n");
1072 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1073 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1074 "running e2fsck is recommended\n");
1075 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1076 printk (KERN_WARNING
1077 "EXT3-fs warning: mounting fs with errors, "
1078 "running e2fsck is recommended\n");
1079 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1080 le16_to_cpu(es->s_mnt_count) >=
1081 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1082 printk (KERN_WARNING
1083 "EXT3-fs warning: maximal mount count reached, "
1084 "running e2fsck is recommended\n");
1085 else if (le32_to_cpu(es->s_checkinterval) &&
1086 (le32_to_cpu(es->s_lastcheck) +
1087 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1088 printk (KERN_WARNING
1089 "EXT3-fs warning: checktime reached, "
1090 "running e2fsck is recommended\n");
1092 /* @@@ We _will_ want to clear the valid bit if we find
1093 inconsistencies, to force a fsck at reboot. But for
1094 a plain journaled filesystem we can keep it set as
1095 valid forever! :) */
1096 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1098 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1099 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1100 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1101 es->s_mtime = cpu_to_le32(get_seconds());
1102 ext3_update_dynamic_rev(sb);
1103 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1105 ext3_commit_super(sb, es, 1);
1106 if (test_opt(sb, DEBUG))
1107 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1108 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1110 sbi->s_groups_count,
1111 EXT3_BLOCKS_PER_GROUP(sb),
1112 EXT3_INODES_PER_GROUP(sb),
1115 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1116 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1117 char b[BDEVNAME_SIZE];
1119 printk("external journal on %s\n",
1120 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1122 printk("internal journal\n");
1127 /* Called at mount-time, super-block is locked */
1128 static int ext3_check_descriptors (struct super_block * sb)
1130 struct ext3_sb_info *sbi = EXT3_SB(sb);
1131 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1132 struct ext3_group_desc * gdp = NULL;
1136 ext3_debug ("Checking group descriptors");
1138 for (i = 0; i < sbi->s_groups_count; i++)
1140 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1141 gdp = (struct ext3_group_desc *)
1142 sbi->s_group_desc[desc_block++]->b_data;
1143 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1144 le32_to_cpu(gdp->bg_block_bitmap) >=
1145 block + EXT3_BLOCKS_PER_GROUP(sb))
1147 ext3_error (sb, "ext3_check_descriptors",
1148 "Block bitmap for group %d"
1149 " not in group (block %lu)!",
1151 le32_to_cpu(gdp->bg_block_bitmap));
1154 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1155 le32_to_cpu(gdp->bg_inode_bitmap) >=
1156 block + EXT3_BLOCKS_PER_GROUP(sb))
1158 ext3_error (sb, "ext3_check_descriptors",
1159 "Inode bitmap for group %d"
1160 " not in group (block %lu)!",
1162 le32_to_cpu(gdp->bg_inode_bitmap));
1165 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1166 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1167 block + EXT3_BLOCKS_PER_GROUP(sb))
1169 ext3_error (sb, "ext3_check_descriptors",
1170 "Inode table for group %d"
1171 " not in group (block %lu)!",
1173 le32_to_cpu(gdp->bg_inode_table));
1176 block += EXT3_BLOCKS_PER_GROUP(sb);
1180 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1181 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1186 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1187 * the superblock) which were deleted from all directories, but held open by
1188 * a process at the time of a crash. We walk the list and try to delete these
1189 * inodes at recovery time (only with a read-write filesystem).
1191 * In order to keep the orphan inode chain consistent during traversal (in
1192 * case of crash during recovery), we link each inode into the superblock
1193 * orphan list_head and handle it the same way as an inode deletion during
1194 * normal operation (which journals the operations for us).
1196 * We only do an iget() and an iput() on each inode, which is very safe if we
1197 * accidentally point at an in-use or already deleted inode. The worst that
1198 * can happen in this case is that we get a "bit already cleared" message from
1199 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1200 * e2fsck was run on this filesystem, and it must have already done the orphan
1201 * inode cleanup for us, so we can safely abort without any further action.
1203 static void ext3_orphan_cleanup (struct super_block * sb,
1204 struct ext3_super_block * es)
1206 unsigned int s_flags = sb->s_flags;
1207 int nr_orphans = 0, nr_truncates = 0;
1211 if (!es->s_last_orphan) {
1212 jbd_debug(4, "no orphan inodes to clean up\n");
1216 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1217 if (es->s_last_orphan)
1218 jbd_debug(1, "Errors on filesystem, "
1219 "clearing orphan list.\n");
1220 es->s_last_orphan = 0;
1221 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1225 if (s_flags & MS_RDONLY) {
1226 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1228 sb->s_flags &= ~MS_RDONLY;
1231 /* Needed for iput() to work correctly and not trash data */
1232 sb->s_flags |= MS_ACTIVE;
1233 /* Turn on quotas so that they are updated correctly */
1234 for (i = 0; i < MAXQUOTAS; i++) {
1235 if (EXT3_SB(sb)->s_qf_names[i]) {
1236 int ret = ext3_quota_on_mount(sb, i);
1239 "EXT3-fs: Cannot turn on journalled "
1240 "quota: error %d\n", ret);
1245 while (es->s_last_orphan) {
1246 struct inode *inode;
1249 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1250 es->s_last_orphan = 0;
1254 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1256 if (inode->i_nlink) {
1258 "%s: truncating inode %ld to %Ld bytes\n",
1259 __FUNCTION__, inode->i_ino, inode->i_size);
1260 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1261 inode->i_ino, inode->i_size);
1262 ext3_truncate(inode);
1266 "%s: deleting unreferenced inode %ld\n",
1267 __FUNCTION__, inode->i_ino);
1268 jbd_debug(2, "deleting unreferenced inode %ld\n",
1272 iput(inode); /* The delete magic happens here! */
1275 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1278 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1279 sb->s_id, PLURAL(nr_orphans));
1281 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1282 sb->s_id, PLURAL(nr_truncates));
1284 /* Turn quotas off */
1285 for (i = 0; i < MAXQUOTAS; i++) {
1286 if (sb_dqopt(sb)->files[i])
1287 vfs_quota_off(sb, i);
1290 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1293 #define log2(n) ffz(~(n))
1296 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1297 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1298 * We need to be 1 filesystem block less than the 2^32 sector limit.
1300 static loff_t ext3_max_size(int bits)
1302 loff_t res = EXT3_NDIR_BLOCKS;
1303 /* This constant is calculated to be the largest file size for a
1304 * dense, 4k-blocksize file such that the total number of
1305 * sectors in the file, including data and all indirect blocks,
1306 * does not exceed 2^32. */
1307 const loff_t upper_limit = 0x1ff7fffd000LL;
1309 res += 1LL << (bits-2);
1310 res += 1LL << (2*(bits-2));
1311 res += 1LL << (3*(bits-2));
1313 if (res > upper_limit)
1318 static unsigned long descriptor_loc(struct super_block *sb,
1319 unsigned long logic_sb_block,
1322 struct ext3_sb_info *sbi = EXT3_SB(sb);
1323 unsigned long bg, first_data_block, first_meta_bg;
1326 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1327 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1329 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1331 return (logic_sb_block + nr + 1);
1332 bg = sbi->s_desc_per_block * nr;
1333 if (ext3_bg_has_super(sb, bg))
1335 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1339 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1341 struct buffer_head * bh;
1342 struct ext3_super_block *es = NULL;
1343 struct ext3_sb_info *sbi;
1344 unsigned long block;
1345 unsigned long sb_block = get_sb_block(&data);
1346 unsigned long logic_sb_block;
1347 unsigned long offset = 0;
1348 unsigned long journal_inum = 0;
1349 unsigned long journal_devnum = 0;
1350 unsigned long def_mount_opts;
1359 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1362 sb->s_fs_info = sbi;
1363 memset(sbi, 0, sizeof(*sbi));
1364 sbi->s_mount_opt = 0;
1365 sbi->s_resuid = EXT3_DEF_RESUID;
1366 sbi->s_resgid = EXT3_DEF_RESGID;
1370 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1372 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1377 * The ext3 superblock will not be buffer aligned for other than 1kB
1378 * block sizes. We need to calculate the offset from buffer start.
1380 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1381 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1382 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1384 logic_sb_block = sb_block;
1387 if (!(bh = sb_bread(sb, logic_sb_block))) {
1388 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1392 * Note: s_es must be initialized as soon as possible because
1393 * some ext3 macro-instructions depend on its value
1395 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1397 sb->s_magic = le16_to_cpu(es->s_magic);
1398 if (sb->s_magic != EXT3_SUPER_MAGIC)
1401 /* Set defaults before we parse the mount options */
1402 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1403 if (def_mount_opts & EXT3_DEFM_DEBUG)
1404 set_opt(sbi->s_mount_opt, DEBUG);
1405 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1406 set_opt(sbi->s_mount_opt, GRPID);
1407 if (def_mount_opts & EXT3_DEFM_UID16)
1408 set_opt(sbi->s_mount_opt, NO_UID32);
1409 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1410 set_opt(sbi->s_mount_opt, XATTR_USER);
1411 if (def_mount_opts & EXT3_DEFM_ACL)
1412 set_opt(sbi->s_mount_opt, POSIX_ACL);
1413 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1414 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1415 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1416 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1417 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1418 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1420 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1421 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1422 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1423 set_opt(sbi->s_mount_opt, ERRORS_RO);
1425 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1426 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1428 set_opt(sbi->s_mount_opt, RESERVATION);
1430 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1434 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1435 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1437 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1438 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1439 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1440 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1442 "EXT3-fs warning: feature flags set on rev 0 fs, "
1443 "running e2fsck is recommended\n");
1445 * Check feature flags regardless of the revision level, since we
1446 * previously didn't change the revision level when setting the flags,
1447 * so there is a chance incompat flags are set on a rev 0 filesystem.
1449 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1451 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1452 "unsupported optional features (%x).\n",
1453 sb->s_id, le32_to_cpu(features));
1456 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1457 if (!(sb->s_flags & MS_RDONLY) && features) {
1458 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1459 "unsupported optional features (%x).\n",
1460 sb->s_id, le32_to_cpu(features));
1463 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1465 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1466 blocksize > EXT3_MAX_BLOCK_SIZE) {
1468 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1469 blocksize, sb->s_id);
1473 hblock = bdev_hardsect_size(sb->s_bdev);
1474 if (sb->s_blocksize != blocksize) {
1476 * Make sure the blocksize for the filesystem is larger
1477 * than the hardware sectorsize for the machine.
1479 if (blocksize < hblock) {
1480 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1481 "device blocksize %d.\n", blocksize, hblock);
1486 sb_set_blocksize(sb, blocksize);
1487 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1488 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1489 bh = sb_bread(sb, logic_sb_block);
1492 "EXT3-fs: Can't read superblock on 2nd try.\n");
1495 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1497 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1499 "EXT3-fs: Magic mismatch, very weird !\n");
1504 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1506 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1507 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1508 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1510 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1511 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1512 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1513 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1514 (sbi->s_inode_size > blocksize)) {
1516 "EXT3-fs: unsupported inode size: %d\n",
1521 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1522 le32_to_cpu(es->s_log_frag_size);
1523 if (blocksize != sbi->s_frag_size) {
1525 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1526 sbi->s_frag_size, blocksize);
1529 sbi->s_frags_per_block = 1;
1530 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1531 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1532 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1533 if (EXT3_INODE_SIZE(sb) == 0)
1535 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1536 if (sbi->s_inodes_per_block == 0)
1538 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1539 sbi->s_inodes_per_block;
1540 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1542 sbi->s_mount_state = le16_to_cpu(es->s_state);
1543 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1544 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1545 for (i=0; i < 4; i++)
1546 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1547 sbi->s_def_hash_version = es->s_def_hash_version;
1549 if (sbi->s_blocks_per_group > blocksize * 8) {
1551 "EXT3-fs: #blocks per group too big: %lu\n",
1552 sbi->s_blocks_per_group);
1555 if (sbi->s_frags_per_group > blocksize * 8) {
1557 "EXT3-fs: #fragments per group too big: %lu\n",
1558 sbi->s_frags_per_group);
1561 if (sbi->s_inodes_per_group > blocksize * 8) {
1563 "EXT3-fs: #inodes per group too big: %lu\n",
1564 sbi->s_inodes_per_group);
1568 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1570 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1571 le32_to_cpu(es->s_first_data_block) +
1572 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1573 EXT3_BLOCKS_PER_GROUP(sb);
1574 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1575 EXT3_DESC_PER_BLOCK(sb);
1576 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1578 if (sbi->s_group_desc == NULL) {
1579 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1583 bgl_lock_init(&sbi->s_blockgroup_lock);
1585 for (i = 0; i < db_count; i++) {
1586 block = descriptor_loc(sb, logic_sb_block, i);
1587 sbi->s_group_desc[i] = sb_bread(sb, block);
1588 if (!sbi->s_group_desc[i]) {
1589 printk (KERN_ERR "EXT3-fs: "
1590 "can't read group descriptor %d\n", i);
1595 if (!ext3_check_descriptors (sb)) {
1596 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1599 sbi->s_gdb_count = db_count;
1600 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1601 spin_lock_init(&sbi->s_next_gen_lock);
1603 percpu_counter_init(&sbi->s_freeblocks_counter,
1604 ext3_count_free_blocks(sb));
1605 percpu_counter_init(&sbi->s_freeinodes_counter,
1606 ext3_count_free_inodes(sb));
1607 percpu_counter_init(&sbi->s_dirs_counter,
1608 ext3_count_dirs(sb));
1610 /* per fileystem reservation list head & lock */
1611 spin_lock_init(&sbi->s_rsv_window_lock);
1612 sbi->s_rsv_window_root = RB_ROOT;
1613 /* Add a single, static dummy reservation to the start of the
1614 * reservation window list --- it gives us a placeholder for
1615 * append-at-start-of-list which makes the allocation logic
1616 * _much_ simpler. */
1617 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1618 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1619 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1620 sbi->s_rsv_window_head.rsv_goal_size = 0;
1621 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1624 * set up enough so that it can read an inode
1626 sb->s_op = &ext3_sops;
1627 sb->s_export_op = &ext3_export_ops;
1628 sb->s_xattr = ext3_xattr_handlers;
1630 sb->s_qcop = &ext3_qctl_operations;
1631 sb->dq_op = &ext3_quota_operations;
1633 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1637 needs_recovery = (es->s_last_orphan != 0 ||
1638 EXT3_HAS_INCOMPAT_FEATURE(sb,
1639 EXT3_FEATURE_INCOMPAT_RECOVER));
1642 * The first inode we look at is the journal inode. Don't try
1643 * root first: it may be modified in the journal!
1645 if (!test_opt(sb, NOLOAD) &&
1646 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1647 if (ext3_load_journal(sb, es, journal_devnum))
1649 } else if (journal_inum) {
1650 if (ext3_create_journal(sb, es, journal_inum))
1655 "ext3: No journal on filesystem on %s\n",
1660 /* We have now updated the journal if required, so we can
1661 * validate the data journaling mode. */
1662 switch (test_opt(sb, DATA_FLAGS)) {
1664 /* No mode set, assume a default based on the journal
1665 capabilities: ORDERED_DATA if the journal can
1666 cope, else JOURNAL_DATA */
1667 if (journal_check_available_features
1668 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1669 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1671 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1674 case EXT3_MOUNT_ORDERED_DATA:
1675 case EXT3_MOUNT_WRITEBACK_DATA:
1676 if (!journal_check_available_features
1677 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1678 printk(KERN_ERR "EXT3-fs: Journal does not support "
1679 "requested data journaling mode\n");
1686 if (test_opt(sb, NOBH)) {
1687 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1688 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1689 "its supported only with writeback mode\n");
1690 clear_opt(sbi->s_mount_opt, NOBH);
1694 * The journal_load will have done any necessary log recovery,
1695 * so we can safely mount the rest of the filesystem now.
1698 root = iget(sb, EXT3_ROOT_INO);
1699 sb->s_root = d_alloc_root(root);
1701 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1705 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1708 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1712 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1714 * akpm: core read_super() calls in here with the superblock locked.
1715 * That deadlocks, because orphan cleanup needs to lock the superblock
1716 * in numerous places. Here we just pop the lock - it's relatively
1717 * harmless, because we are now ready to accept write_super() requests,
1718 * and aviro says that's the only reason for hanging onto the
1721 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1722 ext3_orphan_cleanup(sb, es);
1723 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1725 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1726 ext3_mark_recovery_complete(sb, es);
1727 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1728 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1729 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1737 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1742 journal_destroy(sbi->s_journal);
1744 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1745 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1746 percpu_counter_destroy(&sbi->s_dirs_counter);
1748 for (i = 0; i < db_count; i++)
1749 brelse(sbi->s_group_desc[i]);
1750 kfree(sbi->s_group_desc);
1753 for (i = 0; i < MAXQUOTAS; i++)
1754 kfree(sbi->s_qf_names[i]);
1756 ext3_blkdev_remove(sbi);
1759 sb->s_fs_info = NULL;
1766 * Setup any per-fs journal parameters now. We'll do this both on
1767 * initial mount, once the journal has been initialised but before we've
1768 * done any recovery; and again on any subsequent remount.
1770 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1772 struct ext3_sb_info *sbi = EXT3_SB(sb);
1774 if (sbi->s_commit_interval)
1775 journal->j_commit_interval = sbi->s_commit_interval;
1776 /* We could also set up an ext3-specific default for the commit
1777 * interval here, but for now we'll just fall back to the jbd
1780 spin_lock(&journal->j_state_lock);
1781 if (test_opt(sb, BARRIER))
1782 journal->j_flags |= JFS_BARRIER;
1784 journal->j_flags &= ~JFS_BARRIER;
1785 spin_unlock(&journal->j_state_lock);
1788 static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1790 struct inode *journal_inode;
1793 /* First, test for the existence of a valid inode on disk. Bad
1794 * things happen if we iget() an unused inode, as the subsequent
1795 * iput() will try to delete it. */
1797 journal_inode = iget(sb, journal_inum);
1798 if (!journal_inode) {
1799 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1802 if (!journal_inode->i_nlink) {
1803 make_bad_inode(journal_inode);
1804 iput(journal_inode);
1805 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1809 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1810 journal_inode, journal_inode->i_size);
1811 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1812 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1813 iput(journal_inode);
1817 journal = journal_init_inode(journal_inode);
1819 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1820 iput(journal_inode);
1823 journal->j_private = sb;
1824 ext3_init_journal_params(sb, journal);
1828 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1831 struct buffer_head * bh;
1835 int hblock, blocksize;
1836 unsigned long sb_block;
1837 unsigned long offset;
1838 struct ext3_super_block * es;
1839 struct block_device *bdev;
1841 bdev = ext3_blkdev_get(j_dev);
1845 if (bd_claim(bdev, sb)) {
1847 "EXT3: failed to claim external journal device.\n");
1852 blocksize = sb->s_blocksize;
1853 hblock = bdev_hardsect_size(bdev);
1854 if (blocksize < hblock) {
1856 "EXT3-fs: blocksize too small for journal device.\n");
1860 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1861 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1862 set_blocksize(bdev, blocksize);
1863 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1864 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1865 "external journal\n");
1869 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1870 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1871 !(le32_to_cpu(es->s_feature_incompat) &
1872 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1873 printk(KERN_ERR "EXT3-fs: external journal has "
1874 "bad superblock\n");
1879 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1880 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1885 len = le32_to_cpu(es->s_blocks_count);
1886 start = sb_block + 1;
1887 brelse(bh); /* we're done with the superblock */
1889 journal = journal_init_dev(bdev, sb->s_bdev,
1890 start, len, blocksize);
1892 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1895 journal->j_private = sb;
1896 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1897 wait_on_buffer(journal->j_sb_buffer);
1898 if (!buffer_uptodate(journal->j_sb_buffer)) {
1899 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1902 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1903 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1904 "user (unsupported) - %d\n",
1905 be32_to_cpu(journal->j_superblock->s_nr_users));
1908 EXT3_SB(sb)->journal_bdev = bdev;
1909 ext3_init_journal_params(sb, journal);
1912 journal_destroy(journal);
1914 ext3_blkdev_put(bdev);
1918 static int ext3_load_journal(struct super_block *sb,
1919 struct ext3_super_block *es,
1920 unsigned long journal_devnum)
1923 int journal_inum = le32_to_cpu(es->s_journal_inum);
1926 int really_read_only;
1928 if (journal_devnum &&
1929 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1930 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
1931 "numbers have changed\n");
1932 journal_dev = new_decode_dev(journal_devnum);
1934 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1936 really_read_only = bdev_read_only(sb->s_bdev);
1939 * Are we loading a blank journal or performing recovery after a
1940 * crash? For recovery, we need to check in advance whether we
1941 * can get read-write access to the device.
1944 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1945 if (sb->s_flags & MS_RDONLY) {
1946 printk(KERN_INFO "EXT3-fs: INFO: recovery "
1947 "required on readonly filesystem.\n");
1948 if (really_read_only) {
1949 printk(KERN_ERR "EXT3-fs: write access "
1950 "unavailable, cannot proceed.\n");
1953 printk (KERN_INFO "EXT3-fs: write access will "
1954 "be enabled during recovery.\n");
1958 if (journal_inum && journal_dev) {
1959 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1960 "and inode journals!\n");
1965 if (!(journal = ext3_get_journal(sb, journal_inum)))
1968 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1972 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1973 err = journal_update_format(journal);
1975 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1976 journal_destroy(journal);
1981 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1982 err = journal_wipe(journal, !really_read_only);
1984 err = journal_load(journal);
1987 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
1988 journal_destroy(journal);
1992 EXT3_SB(sb)->s_journal = journal;
1993 ext3_clear_journal_err(sb, es);
1995 if (journal_devnum &&
1996 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1997 es->s_journal_dev = cpu_to_le32(journal_devnum);
2000 /* Make sure we flush the recovery flag to disk. */
2001 ext3_commit_super(sb, es, 1);
2007 static int ext3_create_journal(struct super_block * sb,
2008 struct ext3_super_block * es,
2013 if (sb->s_flags & MS_RDONLY) {
2014 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2015 "create journal.\n");
2019 if (!(journal = ext3_get_journal(sb, journal_inum)))
2022 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
2025 if (journal_create(journal)) {
2026 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2027 journal_destroy(journal);
2031 EXT3_SB(sb)->s_journal = journal;
2033 ext3_update_dynamic_rev(sb);
2034 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2035 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2037 es->s_journal_inum = cpu_to_le32(journal_inum);
2040 /* Make sure we flush the recovery flag to disk. */
2041 ext3_commit_super(sb, es, 1);
2046 static void ext3_commit_super (struct super_block * sb,
2047 struct ext3_super_block * es,
2050 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2054 es->s_wtime = cpu_to_le32(get_seconds());
2055 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2056 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2057 BUFFER_TRACE(sbh, "marking dirty");
2058 mark_buffer_dirty(sbh);
2060 sync_dirty_buffer(sbh);
2065 * Have we just finished recovery? If so, and if we are mounting (or
2066 * remounting) the filesystem readonly, then we will end up with a
2067 * consistent fs on disk. Record that fact.
2069 static void ext3_mark_recovery_complete(struct super_block * sb,
2070 struct ext3_super_block * es)
2072 journal_t *journal = EXT3_SB(sb)->s_journal;
2074 journal_lock_updates(journal);
2075 journal_flush(journal);
2076 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2077 sb->s_flags & MS_RDONLY) {
2078 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2080 ext3_commit_super(sb, es, 1);
2082 journal_unlock_updates(journal);
2086 * If we are mounting (or read-write remounting) a filesystem whose journal
2087 * has recorded an error from a previous lifetime, move that error to the
2088 * main filesystem now.
2090 static void ext3_clear_journal_err(struct super_block * sb,
2091 struct ext3_super_block * es)
2097 journal = EXT3_SB(sb)->s_journal;
2100 * Now check for any error status which may have been recorded in the
2101 * journal by a prior ext3_error() or ext3_abort()
2104 j_errno = journal_errno(journal);
2108 errstr = ext3_decode_error(sb, j_errno, nbuf);
2109 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2110 "from previous mount: %s", errstr);
2111 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2112 "filesystem check.");
2114 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2115 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2116 ext3_commit_super (sb, es, 1);
2118 journal_clear_err(journal);
2123 * Force the running and committing transactions to commit,
2124 * and wait on the commit.
2126 int ext3_force_commit(struct super_block *sb)
2131 if (sb->s_flags & MS_RDONLY)
2134 journal = EXT3_SB(sb)->s_journal;
2136 ret = ext3_journal_force_commit(journal);
2141 * Ext3 always journals updates to the superblock itself, so we don't
2142 * have to propagate any other updates to the superblock on disk at this
2143 * point. Just start an async writeback to get the buffers on their way
2146 * This implicitly triggers the writebehind on sync().
2149 static void ext3_write_super (struct super_block * sb)
2151 if (mutex_trylock(&sb->s_lock) != 0)
2156 static int ext3_sync_fs(struct super_block *sb, int wait)
2161 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2163 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2169 * LVM calls this function before a (read-only) snapshot is created. This
2170 * gives us a chance to flush the journal completely and mark the fs clean.
2172 static void ext3_write_super_lockfs(struct super_block *sb)
2176 if (!(sb->s_flags & MS_RDONLY)) {
2177 journal_t *journal = EXT3_SB(sb)->s_journal;
2179 /* Now we set up the journal barrier. */
2180 journal_lock_updates(journal);
2181 journal_flush(journal);
2183 /* Journal blocked and flushed, clear needs_recovery flag. */
2184 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2185 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2190 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2191 * flag here, even though the filesystem is not technically dirty yet.
2193 static void ext3_unlockfs(struct super_block *sb)
2195 if (!(sb->s_flags & MS_RDONLY)) {
2197 /* Reser the needs_recovery flag before the fs is unlocked. */
2198 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2199 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2201 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2205 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2207 struct ext3_super_block * es;
2208 struct ext3_sb_info *sbi = EXT3_SB(sb);
2209 unsigned long n_blocks_count = 0;
2210 unsigned long old_sb_flags;
2211 struct ext3_mount_options old_opts;
2217 /* Store the original options */
2218 old_sb_flags = sb->s_flags;
2219 old_opts.s_mount_opt = sbi->s_mount_opt;
2220 old_opts.s_resuid = sbi->s_resuid;
2221 old_opts.s_resgid = sbi->s_resgid;
2222 old_opts.s_commit_interval = sbi->s_commit_interval;
2224 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2225 for (i = 0; i < MAXQUOTAS; i++)
2226 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2230 * Allow the "check" option to be passed as a remount option.
2232 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2237 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2238 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2240 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2241 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2245 ext3_init_journal_params(sb, sbi->s_journal);
2247 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2248 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2249 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2254 if (*flags & MS_RDONLY) {
2256 * First of all, the unconditional stuff we have to do
2257 * to disable replay of the journal when we next remount
2259 sb->s_flags |= MS_RDONLY;
2262 * OK, test if we are remounting a valid rw partition
2263 * readonly, and if so set the rdonly flag and then
2264 * mark the partition as valid again.
2266 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2267 (sbi->s_mount_state & EXT3_VALID_FS))
2268 es->s_state = cpu_to_le16(sbi->s_mount_state);
2270 ext3_mark_recovery_complete(sb, es);
2273 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2274 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2275 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2276 "remount RDWR because of unsupported "
2277 "optional features (%x).\n",
2278 sb->s_id, le32_to_cpu(ret));
2283 * Mounting a RDONLY partition read-write, so reread
2284 * and store the current valid flag. (It may have
2285 * been changed by e2fsck since we originally mounted
2288 ext3_clear_journal_err(sb, es);
2289 sbi->s_mount_state = le16_to_cpu(es->s_state);
2290 if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2294 if (!ext3_setup_super (sb, es, 0))
2295 sb->s_flags &= ~MS_RDONLY;
2299 /* Release old quota file names */
2300 for (i = 0; i < MAXQUOTAS; i++)
2301 if (old_opts.s_qf_names[i] &&
2302 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2303 kfree(old_opts.s_qf_names[i]);
2307 sb->s_flags = old_sb_flags;
2308 sbi->s_mount_opt = old_opts.s_mount_opt;
2309 sbi->s_resuid = old_opts.s_resuid;
2310 sbi->s_resgid = old_opts.s_resgid;
2311 sbi->s_commit_interval = old_opts.s_commit_interval;
2313 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2314 for (i = 0; i < MAXQUOTAS; i++) {
2315 if (sbi->s_qf_names[i] &&
2316 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2317 kfree(sbi->s_qf_names[i]);
2318 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2324 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2326 struct super_block *sb = dentry->d_sb;
2327 struct ext3_sb_info *sbi = EXT3_SB(sb);
2328 struct ext3_super_block *es = sbi->s_es;
2329 unsigned long overhead;
2332 if (test_opt (sb, MINIX_DF))
2335 unsigned long ngroups;
2336 ngroups = EXT3_SB(sb)->s_groups_count;
2340 * Compute the overhead (FS structures)
2344 * All of the blocks before first_data_block are
2347 overhead = le32_to_cpu(es->s_first_data_block);
2350 * Add the overhead attributed to the superblock and
2351 * block group descriptors. If the sparse superblocks
2352 * feature is turned on, then not all groups have this.
2354 for (i = 0; i < ngroups; i++) {
2355 overhead += ext3_bg_has_super(sb, i) +
2356 ext3_bg_num_gdb(sb, i);
2361 * Every block group has an inode bitmap, a block
2362 * bitmap, and an inode table.
2364 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2367 buf->f_type = EXT3_SUPER_MAGIC;
2368 buf->f_bsize = sb->s_blocksize;
2369 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2370 buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
2371 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2372 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2374 buf->f_files = le32_to_cpu(es->s_inodes_count);
2375 buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
2376 buf->f_namelen = EXT3_NAME_LEN;
2380 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2381 * is locked for write. Otherwise the are possible deadlocks:
2382 * Process 1 Process 2
2383 * ext3_create() quota_sync()
2384 * journal_start() write_dquot()
2385 * DQUOT_INIT() down(dqio_mutex)
2386 * down(dqio_mutex) journal_start()
2392 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2394 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2397 static int ext3_dquot_initialize(struct inode *inode, int type)
2402 /* We may create quota structure so we need to reserve enough blocks */
2403 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2405 return PTR_ERR(handle);
2406 ret = dquot_initialize(inode, type);
2407 err = ext3_journal_stop(handle);
2413 static int ext3_dquot_drop(struct inode *inode)
2418 /* We may delete quota structure so we need to reserve enough blocks */
2419 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2421 return PTR_ERR(handle);
2422 ret = dquot_drop(inode);
2423 err = ext3_journal_stop(handle);
2429 static int ext3_write_dquot(struct dquot *dquot)
2433 struct inode *inode;
2435 inode = dquot_to_inode(dquot);
2436 handle = ext3_journal_start(inode,
2437 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2439 return PTR_ERR(handle);
2440 ret = dquot_commit(dquot);
2441 err = ext3_journal_stop(handle);
2447 static int ext3_acquire_dquot(struct dquot *dquot)
2452 handle = ext3_journal_start(dquot_to_inode(dquot),
2453 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2455 return PTR_ERR(handle);
2456 ret = dquot_acquire(dquot);
2457 err = ext3_journal_stop(handle);
2463 static int ext3_release_dquot(struct dquot *dquot)
2468 handle = ext3_journal_start(dquot_to_inode(dquot),
2469 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2471 return PTR_ERR(handle);
2472 ret = dquot_release(dquot);
2473 err = ext3_journal_stop(handle);
2479 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2481 /* Are we journalling quotas? */
2482 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2483 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2484 dquot_mark_dquot_dirty(dquot);
2485 return ext3_write_dquot(dquot);
2487 return dquot_mark_dquot_dirty(dquot);
2491 static int ext3_write_info(struct super_block *sb, int type)
2496 /* Data block + inode block */
2497 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2499 return PTR_ERR(handle);
2500 ret = dquot_commit_info(sb, type);
2501 err = ext3_journal_stop(handle);
2508 * Turn on quotas during mount time - we need to find
2509 * the quota file and such...
2511 static int ext3_quota_on_mount(struct super_block *sb, int type)
2513 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2514 EXT3_SB(sb)->s_jquota_fmt, type);
2518 * Standard function to be called on quota_on
2520 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2524 struct nameidata nd;
2526 if (!test_opt(sb, QUOTA))
2528 /* Not journalling quota? */
2529 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2530 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2531 return vfs_quota_on(sb, type, format_id, path);
2532 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2535 /* Quotafile not on the same filesystem? */
2536 if (nd.mnt->mnt_sb != sb) {
2540 /* Quotafile not of fs root? */
2541 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2543 "EXT3-fs: Quota file not on filesystem root. "
2544 "Journalled quota will not work.\n");
2546 return vfs_quota_on(sb, type, format_id, path);
2549 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2550 * acquiring the locks... As quota files are never truncated and quota code
2551 * itself serializes the operations (and noone else should touch the files)
2552 * we don't have to be afraid of races */
2553 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2554 size_t len, loff_t off)
2556 struct inode *inode = sb_dqopt(sb)->files[type];
2557 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2559 int offset = off & (sb->s_blocksize - 1);
2562 struct buffer_head *bh;
2563 loff_t i_size = i_size_read(inode);
2567 if (off+len > i_size)
2570 while (toread > 0) {
2571 tocopy = sb->s_blocksize - offset < toread ?
2572 sb->s_blocksize - offset : toread;
2573 bh = ext3_bread(NULL, inode, blk, 0, &err);
2576 if (!bh) /* A hole? */
2577 memset(data, 0, tocopy);
2579 memcpy(data, bh->b_data+offset, tocopy);
2589 /* Write to quotafile (we know the transaction is already started and has
2590 * enough credits) */
2591 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2592 const char *data, size_t len, loff_t off)
2594 struct inode *inode = sb_dqopt(sb)->files[type];
2595 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2597 int offset = off & (sb->s_blocksize - 1);
2599 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2600 size_t towrite = len;
2601 struct buffer_head *bh;
2602 handle_t *handle = journal_current_handle();
2604 mutex_lock(&inode->i_mutex);
2605 while (towrite > 0) {
2606 tocopy = sb->s_blocksize - offset < towrite ?
2607 sb->s_blocksize - offset : towrite;
2608 bh = ext3_bread(handle, inode, blk, 1, &err);
2611 if (journal_quota) {
2612 err = ext3_journal_get_write_access(handle, bh);
2619 memcpy(bh->b_data+offset, data, tocopy);
2620 flush_dcache_page(bh->b_page);
2623 err = ext3_journal_dirty_metadata(handle, bh);
2625 /* Always do at least ordered writes for quotas */
2626 err = ext3_journal_dirty_data(handle, bh);
2627 mark_buffer_dirty(bh);
2640 if (inode->i_size < off+len-towrite) {
2641 i_size_write(inode, off+len-towrite);
2642 EXT3_I(inode)->i_disksize = inode->i_size;
2645 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2646 ext3_mark_inode_dirty(handle, inode);
2647 mutex_unlock(&inode->i_mutex);
2648 return len - towrite;
2653 static int ext3_get_sb(struct file_system_type *fs_type,
2654 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2656 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2659 static struct file_system_type ext3_fs_type = {
2660 .owner = THIS_MODULE,
2662 .get_sb = ext3_get_sb,
2663 .kill_sb = kill_block_super,
2664 .fs_flags = FS_REQUIRES_DEV,
2667 static int __init init_ext3_fs(void)
2669 int err = init_ext3_xattr();
2672 err = init_inodecache();
2675 err = register_filesystem(&ext3_fs_type);
2680 destroy_inodecache();
2686 static void __exit exit_ext3_fs(void)
2688 unregister_filesystem(&ext3_fs_type);
2689 destroy_inodecache();
2693 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2694 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2695 MODULE_LICENSE("GPL");
2696 module_init(init_ext3_fs)
2697 module_exit(exit_ext3_fs)