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>
39 #include <asm/uaccess.h>
43 static int ext3_load_journal(struct super_block *, struct ext3_super_block *);
44 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
46 static void ext3_commit_super (struct super_block * sb,
47 struct ext3_super_block * es,
49 static void ext3_mark_recovery_complete(struct super_block * sb,
50 struct ext3_super_block * es);
51 static void ext3_clear_journal_err(struct super_block * sb,
52 struct ext3_super_block * es);
53 static int ext3_sync_fs(struct super_block *sb, int wait);
54 static const char *ext3_decode_error(struct super_block * sb, int errno,
56 static int ext3_remount (struct super_block * sb, int * flags, char * data);
57 static int ext3_statfs (struct super_block * sb, struct kstatfs * buf);
58 static void ext3_unlockfs(struct super_block *sb);
59 static void ext3_write_super (struct super_block * sb);
60 static void ext3_write_super_lockfs(struct super_block *sb);
63 * Wrappers for journal_start/end.
65 * The only special thing we need to do here is to make sure that all
66 * journal_end calls result in the superblock being marked dirty, so
67 * that sync() will call the filesystem's write_super callback if
70 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
74 if (sb->s_flags & MS_RDONLY)
75 return ERR_PTR(-EROFS);
77 /* Special case here: if the journal has aborted behind our
78 * backs (eg. EIO in the commit thread), then we still need to
79 * take the FS itself readonly cleanly. */
80 journal = EXT3_SB(sb)->s_journal;
81 if (is_journal_aborted(journal)) {
82 ext3_abort(sb, __FUNCTION__,
83 "Detected aborted journal");
84 return ERR_PTR(-EROFS);
87 return journal_start(journal, nblocks);
91 * The only special thing we need to do here is to make sure that all
92 * journal_stop calls result in the superblock being marked dirty, so
93 * that sync() will call the filesystem's write_super callback if
96 int __ext3_journal_stop(const char *where, handle_t *handle)
98 struct super_block *sb;
102 sb = handle->h_transaction->t_journal->j_private;
104 rc = journal_stop(handle);
109 __ext3_std_error(sb, where, err);
113 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
114 struct buffer_head *bh, handle_t *handle, int err)
117 const char *errstr = ext3_decode_error(NULL, err, nbuf);
120 BUFFER_TRACE(bh, "abort");
125 if (is_handle_aborted(handle))
128 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
129 caller, errstr, err_fn);
131 journal_abort_handle(handle);
134 /* Deal with the reporting of failure conditions on a filesystem such as
135 * inconsistencies detected or read IO failures.
137 * On ext2, we can store the error state of the filesystem in the
138 * superblock. That is not possible on ext3, because we may have other
139 * write ordering constraints on the superblock which prevent us from
140 * writing it out straight away; and given that the journal is about to
141 * be aborted, we can't rely on the current, or future, transactions to
142 * write out the superblock safely.
144 * We'll just use the journal_abort() error code to record an error in
145 * the journal instead. On recovery, the journal will compain about
146 * that error until we've noted it down and cleared it.
149 static void ext3_handle_error(struct super_block *sb)
151 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
153 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
154 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
156 if (sb->s_flags & MS_RDONLY)
159 if (test_opt (sb, ERRORS_RO)) {
160 printk (KERN_CRIT "Remounting filesystem read-only\n");
161 sb->s_flags |= MS_RDONLY;
163 journal_t *journal = EXT3_SB(sb)->s_journal;
165 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
167 journal_abort(journal, -EIO);
169 if (test_opt(sb, ERRORS_PANIC))
170 panic("EXT3-fs (device %s): panic forced after error\n",
172 ext3_commit_super(sb, es, 1);
175 void ext3_error (struct super_block * sb, const char * function,
176 const char * fmt, ...)
181 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
186 ext3_handle_error(sb);
189 static const char *ext3_decode_error(struct super_block * sb, int errno,
196 errstr = "IO failure";
199 errstr = "Out of memory";
202 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
203 errstr = "Journal has aborted";
205 errstr = "Readonly filesystem";
208 /* If the caller passed in an extra buffer for unknown
209 * errors, textualise them now. Else we just return
212 /* Check for truncated error codes... */
213 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
222 /* __ext3_std_error decodes expected errors from journaling functions
223 * automatically and invokes the appropriate error response. */
225 void __ext3_std_error (struct super_block * sb, const char * function,
231 /* Special case: if the error is EROFS, and we're not already
232 * inside a transaction, then there's really no point in logging
234 if (errno == -EROFS && journal_current_handle() == NULL &&
235 (sb->s_flags & MS_RDONLY))
238 errstr = ext3_decode_error(sb, errno, nbuf);
239 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
240 sb->s_id, function, errstr);
242 ext3_handle_error(sb);
246 * ext3_abort is a much stronger failure handler than ext3_error. The
247 * abort function may be used to deal with unrecoverable failures such
248 * as journal IO errors or ENOMEM at a critical moment in log management.
250 * We unconditionally force the filesystem into an ABORT|READONLY state,
251 * unless the error response on the fs has been set to panic in which
252 * case we take the easy way out and panic immediately.
255 void ext3_abort (struct super_block * sb, const char * function,
256 const char * fmt, ...)
260 printk (KERN_CRIT "ext3_abort called.\n");
263 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
268 if (test_opt(sb, ERRORS_PANIC))
269 panic("EXT3-fs panic from previous error\n");
271 if (sb->s_flags & MS_RDONLY)
274 printk(KERN_CRIT "Remounting filesystem read-only\n");
275 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
276 sb->s_flags |= MS_RDONLY;
277 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
278 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
281 void ext3_warning (struct super_block * sb, const char * function,
282 const char * fmt, ...)
287 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
294 void ext3_update_dynamic_rev(struct super_block *sb)
296 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
298 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
301 ext3_warning(sb, __FUNCTION__,
302 "updating to rev %d because of new feature flag, "
303 "running e2fsck is recommended",
306 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
307 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
308 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
309 /* leave es->s_feature_*compat flags alone */
310 /* es->s_uuid will be set by e2fsck if empty */
313 * The rest of the superblock fields should be zero, and if not it
314 * means they are likely already in use, so leave them alone. We
315 * can leave it up to e2fsck to clean up any inconsistencies there.
320 * Open the external journal device
322 static struct block_device *ext3_blkdev_get(dev_t dev)
324 struct block_device *bdev;
325 char b[BDEVNAME_SIZE];
327 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
333 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
334 __bdevname(dev, b), PTR_ERR(bdev));
339 * Release the journal device
341 static int ext3_blkdev_put(struct block_device *bdev)
344 return blkdev_put(bdev);
347 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
349 struct block_device *bdev;
352 bdev = sbi->journal_bdev;
354 ret = ext3_blkdev_put(bdev);
355 sbi->journal_bdev = NULL;
360 static inline struct inode *orphan_list_entry(struct list_head *l)
362 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
365 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
369 printk(KERN_ERR "sb orphan head is %d\n",
370 le32_to_cpu(sbi->s_es->s_last_orphan));
372 printk(KERN_ERR "sb_info orphan list:\n");
373 list_for_each(l, &sbi->s_orphan) {
374 struct inode *inode = orphan_list_entry(l);
376 "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
377 inode->i_sb->s_id, inode->i_ino, inode,
378 inode->i_mode, inode->i_nlink,
383 static void ext3_put_super (struct super_block * sb)
385 struct ext3_sb_info *sbi = EXT3_SB(sb);
386 struct ext3_super_block *es = sbi->s_es;
389 ext3_xattr_put_super(sb);
390 journal_destroy(sbi->s_journal);
391 if (!(sb->s_flags & MS_RDONLY)) {
392 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
393 es->s_state = cpu_to_le16(sbi->s_mount_state);
394 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
395 mark_buffer_dirty(sbi->s_sbh);
396 ext3_commit_super(sb, es, 1);
399 for (i = 0; i < sbi->s_gdb_count; i++)
400 brelse(sbi->s_group_desc[i]);
401 kfree(sbi->s_group_desc);
402 percpu_counter_destroy(&sbi->s_freeblocks_counter);
403 percpu_counter_destroy(&sbi->s_freeinodes_counter);
404 percpu_counter_destroy(&sbi->s_dirs_counter);
407 for (i = 0; i < MAXQUOTAS; i++)
408 kfree(sbi->s_qf_names[i]);
411 /* Debugging code just in case the in-memory inode orphan list
412 * isn't empty. The on-disk one can be non-empty if we've
413 * detected an error and taken the fs readonly, but the
414 * in-memory list had better be clean by this point. */
415 if (!list_empty(&sbi->s_orphan))
416 dump_orphan_list(sb, sbi);
417 J_ASSERT(list_empty(&sbi->s_orphan));
419 invalidate_bdev(sb->s_bdev, 0);
420 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
422 * Invalidate the journal device's buffers. We don't want them
423 * floating about in memory - the physical journal device may
424 * hotswapped, and it breaks the `ro-after' testing code.
426 sync_blockdev(sbi->journal_bdev);
427 invalidate_bdev(sbi->journal_bdev, 0);
428 ext3_blkdev_remove(sbi);
430 sb->s_fs_info = NULL;
435 static kmem_cache_t *ext3_inode_cachep;
438 * Called inside transaction, so use GFP_NOFS
440 static struct inode *ext3_alloc_inode(struct super_block *sb)
442 struct ext3_inode_info *ei;
444 ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
447 #ifdef CONFIG_EXT3_FS_POSIX_ACL
448 ei->i_acl = EXT3_ACL_NOT_CACHED;
449 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
451 ei->i_block_alloc_info = NULL;
452 ei->vfs_inode.i_version = 1;
453 return &ei->vfs_inode;
456 static void ext3_destroy_inode(struct inode *inode)
458 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
461 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
463 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
465 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
466 SLAB_CTOR_CONSTRUCTOR) {
467 INIT_LIST_HEAD(&ei->i_orphan);
468 #ifdef CONFIG_EXT3_FS_XATTR
469 init_rwsem(&ei->xattr_sem);
471 init_MUTEX(&ei->truncate_sem);
472 inode_init_once(&ei->vfs_inode);
476 static int init_inodecache(void)
478 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
479 sizeof(struct ext3_inode_info),
480 0, SLAB_RECLAIM_ACCOUNT,
482 if (ext3_inode_cachep == NULL)
487 static void destroy_inodecache(void)
489 if (kmem_cache_destroy(ext3_inode_cachep))
490 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
493 static void ext3_clear_inode(struct inode *inode)
495 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
496 #ifdef CONFIG_EXT3_FS_POSIX_ACL
497 if (EXT3_I(inode)->i_acl &&
498 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
499 posix_acl_release(EXT3_I(inode)->i_acl);
500 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
502 if (EXT3_I(inode)->i_default_acl &&
503 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
504 posix_acl_release(EXT3_I(inode)->i_default_acl);
505 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
508 ext3_discard_reservation(inode);
509 EXT3_I(inode)->i_block_alloc_info = NULL;
513 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
515 #if defined(CONFIG_QUOTA)
516 struct ext3_sb_info *sbi = EXT3_SB(sb);
518 if (sbi->s_jquota_fmt)
519 seq_printf(seq, ",jqfmt=%s",
520 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
522 if (sbi->s_qf_names[USRQUOTA])
523 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
525 if (sbi->s_qf_names[GRPQUOTA])
526 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
528 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
529 seq_puts(seq, ",usrquota");
531 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
532 seq_puts(seq, ",grpquota");
536 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
538 struct super_block *sb = vfs->mnt_sb;
540 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
541 seq_puts(seq, ",data=journal");
542 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
543 seq_puts(seq, ",data=ordered");
544 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
545 seq_puts(seq, ",data=writeback");
547 ext3_show_quota_options(seq, sb);
553 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
554 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
556 static int ext3_dquot_initialize(struct inode *inode, int type);
557 static int ext3_dquot_drop(struct inode *inode);
558 static int ext3_write_dquot(struct dquot *dquot);
559 static int ext3_acquire_dquot(struct dquot *dquot);
560 static int ext3_release_dquot(struct dquot *dquot);
561 static int ext3_mark_dquot_dirty(struct dquot *dquot);
562 static int ext3_write_info(struct super_block *sb, int type);
563 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
564 static int ext3_quota_on_mount(struct super_block *sb, int type);
565 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
566 size_t len, loff_t off);
567 static ssize_t ext3_quota_write(struct super_block *sb, int type,
568 const char *data, size_t len, loff_t off);
570 static struct dquot_operations ext3_quota_operations = {
571 .initialize = ext3_dquot_initialize,
572 .drop = ext3_dquot_drop,
573 .alloc_space = dquot_alloc_space,
574 .alloc_inode = dquot_alloc_inode,
575 .free_space = dquot_free_space,
576 .free_inode = dquot_free_inode,
577 .transfer = dquot_transfer,
578 .write_dquot = ext3_write_dquot,
579 .acquire_dquot = ext3_acquire_dquot,
580 .release_dquot = ext3_release_dquot,
581 .mark_dirty = ext3_mark_dquot_dirty,
582 .write_info = ext3_write_info
585 static struct quotactl_ops ext3_qctl_operations = {
586 .quota_on = ext3_quota_on,
587 .quota_off = vfs_quota_off,
588 .quota_sync = vfs_quota_sync,
589 .get_info = vfs_get_dqinfo,
590 .set_info = vfs_set_dqinfo,
591 .get_dqblk = vfs_get_dqblk,
592 .set_dqblk = vfs_set_dqblk
596 static struct super_operations ext3_sops = {
597 .alloc_inode = ext3_alloc_inode,
598 .destroy_inode = ext3_destroy_inode,
599 .read_inode = ext3_read_inode,
600 .write_inode = ext3_write_inode,
601 .dirty_inode = ext3_dirty_inode,
602 .delete_inode = ext3_delete_inode,
603 .put_super = ext3_put_super,
604 .write_super = ext3_write_super,
605 .sync_fs = ext3_sync_fs,
606 .write_super_lockfs = ext3_write_super_lockfs,
607 .unlockfs = ext3_unlockfs,
608 .statfs = ext3_statfs,
609 .remount_fs = ext3_remount,
610 .clear_inode = ext3_clear_inode,
611 .show_options = ext3_show_options,
613 .quota_read = ext3_quota_read,
614 .quota_write = ext3_quota_write,
618 struct dentry *ext3_get_parent(struct dentry *child);
619 static struct export_operations ext3_export_ops = {
620 .get_parent = ext3_get_parent,
624 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
625 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
626 Opt_nouid32, Opt_check, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
627 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
628 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,
629 Opt_commit, Opt_journal_update, Opt_journal_inum,
630 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
631 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
632 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
633 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
637 static match_table_t tokens = {
638 {Opt_bsd_df, "bsddf"},
639 {Opt_minix_df, "minixdf"},
640 {Opt_grpid, "grpid"},
641 {Opt_grpid, "bsdgroups"},
642 {Opt_nogrpid, "nogrpid"},
643 {Opt_nogrpid, "sysvgroups"},
644 {Opt_resgid, "resgid=%u"},
645 {Opt_resuid, "resuid=%u"},
647 {Opt_err_cont, "errors=continue"},
648 {Opt_err_panic, "errors=panic"},
649 {Opt_err_ro, "errors=remount-ro"},
650 {Opt_nouid32, "nouid32"},
651 {Opt_nocheck, "nocheck"},
652 {Opt_nocheck, "check=none"},
653 {Opt_check, "check"},
654 {Opt_debug, "debug"},
655 {Opt_oldalloc, "oldalloc"},
656 {Opt_orlov, "orlov"},
657 {Opt_user_xattr, "user_xattr"},
658 {Opt_nouser_xattr, "nouser_xattr"},
660 {Opt_noacl, "noacl"},
661 {Opt_reservation, "reservation"},
662 {Opt_noreservation, "noreservation"},
663 {Opt_noload, "noload"},
665 {Opt_commit, "commit=%u"},
666 {Opt_journal_update, "journal=update"},
667 {Opt_journal_inum, "journal=%u"},
668 {Opt_abort, "abort"},
669 {Opt_data_journal, "data=journal"},
670 {Opt_data_ordered, "data=ordered"},
671 {Opt_data_writeback, "data=writeback"},
672 {Opt_offusrjquota, "usrjquota="},
673 {Opt_usrjquota, "usrjquota=%s"},
674 {Opt_offgrpjquota, "grpjquota="},
675 {Opt_grpjquota, "grpjquota=%s"},
676 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
677 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
678 {Opt_grpquota, "grpquota"},
679 {Opt_noquota, "noquota"},
680 {Opt_quota, "quota"},
681 {Opt_usrquota, "usrquota"},
682 {Opt_barrier, "barrier=%u"},
684 {Opt_resize, "resize"},
687 static unsigned long get_sb_block(void **data)
689 unsigned long sb_block;
690 char *options = (char *) *data;
692 if (!options || strncmp(options, "sb=", 3) != 0)
693 return 1; /* Default location */
695 sb_block = simple_strtoul(options, &options, 0);
696 if (*options && *options != ',') {
697 printk("EXT3-fs: Invalid sb specification: %s\n",
703 *data = (void *) options;
707 static int parse_options (char * options, struct super_block *sb,
708 unsigned long * inum, unsigned long *n_blocks_count, int is_remount)
710 struct ext3_sb_info *sbi = EXT3_SB(sb);
712 substring_t args[MAX_OPT_ARGS];
723 while ((p = strsep (&options, ",")) != NULL) {
728 token = match_token(p, tokens, args);
731 clear_opt (sbi->s_mount_opt, MINIX_DF);
734 set_opt (sbi->s_mount_opt, MINIX_DF);
737 set_opt (sbi->s_mount_opt, GRPID);
740 clear_opt (sbi->s_mount_opt, GRPID);
743 if (match_int(&args[0], &option))
745 sbi->s_resuid = option;
748 if (match_int(&args[0], &option))
750 sbi->s_resgid = option;
753 /* handled by get_sb_block() instead of here */
754 /* *sb_block = match_int(&args[0]); */
757 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
758 clear_opt (sbi->s_mount_opt, ERRORS_RO);
759 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
762 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
763 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
764 set_opt (sbi->s_mount_opt, ERRORS_RO);
767 clear_opt (sbi->s_mount_opt, ERRORS_RO);
768 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
769 set_opt (sbi->s_mount_opt, ERRORS_CONT);
772 set_opt (sbi->s_mount_opt, NO_UID32);
775 #ifdef CONFIG_EXT3_CHECK
776 set_opt (sbi->s_mount_opt, CHECK);
779 "EXT3 Check option not supported\n");
783 clear_opt (sbi->s_mount_opt, CHECK);
786 set_opt (sbi->s_mount_opt, DEBUG);
789 set_opt (sbi->s_mount_opt, OLDALLOC);
792 clear_opt (sbi->s_mount_opt, OLDALLOC);
794 #ifdef CONFIG_EXT3_FS_XATTR
796 set_opt (sbi->s_mount_opt, XATTR_USER);
798 case Opt_nouser_xattr:
799 clear_opt (sbi->s_mount_opt, XATTR_USER);
803 case Opt_nouser_xattr:
804 printk("EXT3 (no)user_xattr options not supported\n");
807 #ifdef CONFIG_EXT3_FS_POSIX_ACL
809 set_opt(sbi->s_mount_opt, POSIX_ACL);
812 clear_opt(sbi->s_mount_opt, POSIX_ACL);
817 printk("EXT3 (no)acl options not supported\n");
820 case Opt_reservation:
821 set_opt(sbi->s_mount_opt, RESERVATION);
823 case Opt_noreservation:
824 clear_opt(sbi->s_mount_opt, RESERVATION);
826 case Opt_journal_update:
828 /* Eventually we will want to be able to create
829 a journal file here. For now, only allow the
830 user to specify an existing inode to be the
833 printk(KERN_ERR "EXT3-fs: cannot specify "
834 "journal on remount\n");
837 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
839 case Opt_journal_inum:
841 printk(KERN_ERR "EXT3-fs: cannot specify "
842 "journal on remount\n");
845 if (match_int(&args[0], &option))
850 set_opt (sbi->s_mount_opt, NOLOAD);
853 if (match_int(&args[0], &option))
858 option = JBD_DEFAULT_MAX_COMMIT_AGE;
859 sbi->s_commit_interval = HZ * option;
861 case Opt_data_journal:
862 data_opt = EXT3_MOUNT_JOURNAL_DATA;
864 case Opt_data_ordered:
865 data_opt = EXT3_MOUNT_ORDERED_DATA;
867 case Opt_data_writeback:
868 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
871 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
874 "EXT3-fs: cannot change data "
875 "mode on remount\n");
879 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
880 sbi->s_mount_opt |= data_opt;
890 if (sb_any_quota_enabled(sb)) {
892 "EXT3-fs: Cannot change journalled "
893 "quota options when quota turned on.\n");
896 qname = match_strdup(&args[0]);
899 "EXT3-fs: not enough memory for "
900 "storing quotafile name.\n");
903 if (sbi->s_qf_names[qtype] &&
904 strcmp(sbi->s_qf_names[qtype], qname)) {
906 "EXT3-fs: %s quota file already "
907 "specified.\n", QTYPE2NAME(qtype));
911 sbi->s_qf_names[qtype] = qname;
912 if (strchr(sbi->s_qf_names[qtype], '/')) {
914 "EXT3-fs: quotafile must be on "
915 "filesystem root.\n");
916 kfree(sbi->s_qf_names[qtype]);
917 sbi->s_qf_names[qtype] = NULL;
920 set_opt(sbi->s_mount_opt, QUOTA);
922 case Opt_offusrjquota:
925 case Opt_offgrpjquota:
928 if (sb_any_quota_enabled(sb)) {
929 printk(KERN_ERR "EXT3-fs: Cannot change "
930 "journalled quota options when "
931 "quota turned on.\n");
935 * The space will be released later when all options
936 * are confirmed to be correct
938 sbi->s_qf_names[qtype] = NULL;
940 case Opt_jqfmt_vfsold:
941 sbi->s_jquota_fmt = QFMT_VFS_OLD;
943 case Opt_jqfmt_vfsv0:
944 sbi->s_jquota_fmt = QFMT_VFS_V0;
948 set_opt(sbi->s_mount_opt, QUOTA);
949 set_opt(sbi->s_mount_opt, USRQUOTA);
952 set_opt(sbi->s_mount_opt, QUOTA);
953 set_opt(sbi->s_mount_opt, GRPQUOTA);
956 if (sb_any_quota_enabled(sb)) {
957 printk(KERN_ERR "EXT3-fs: Cannot change quota "
958 "options when quota turned on.\n");
961 clear_opt(sbi->s_mount_opt, QUOTA);
962 clear_opt(sbi->s_mount_opt, USRQUOTA);
963 clear_opt(sbi->s_mount_opt, GRPQUOTA);
971 case Opt_offusrjquota:
972 case Opt_offgrpjquota:
973 case Opt_jqfmt_vfsold:
974 case Opt_jqfmt_vfsv0:
976 "EXT3-fs: journalled quota options not "
983 set_opt(sbi->s_mount_opt, ABORT);
986 if (match_int(&args[0], &option))
989 set_opt(sbi->s_mount_opt, BARRIER);
991 clear_opt(sbi->s_mount_opt, BARRIER);
997 printk("EXT3-fs: resize option only available "
1001 if (match_int(&args[0], &option) != 0)
1003 *n_blocks_count = option;
1006 set_opt(sbi->s_mount_opt, NOBH);
1010 "EXT3-fs: Unrecognized mount option \"%s\" "
1011 "or missing value\n", p);
1016 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1017 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1018 sbi->s_qf_names[USRQUOTA])
1019 clear_opt(sbi->s_mount_opt, USRQUOTA);
1021 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1022 sbi->s_qf_names[GRPQUOTA])
1023 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1025 if ((sbi->s_qf_names[USRQUOTA] &&
1026 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1027 (sbi->s_qf_names[GRPQUOTA] &&
1028 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1029 printk(KERN_ERR "EXT3-fs: old and new quota "
1030 "format mixing.\n");
1034 if (!sbi->s_jquota_fmt) {
1035 printk(KERN_ERR "EXT3-fs: journalled quota format "
1036 "not specified.\n");
1040 if (sbi->s_jquota_fmt) {
1041 printk(KERN_ERR "EXT3-fs: journalled quota format "
1042 "specified with no journalling "
1051 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1054 struct ext3_sb_info *sbi = EXT3_SB(sb);
1057 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1058 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1059 "forcing read-only mode\n");
1064 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1065 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1066 "running e2fsck is recommended\n");
1067 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1068 printk (KERN_WARNING
1069 "EXT3-fs warning: mounting fs with errors, "
1070 "running e2fsck is recommended\n");
1071 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1072 le16_to_cpu(es->s_mnt_count) >=
1073 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1074 printk (KERN_WARNING
1075 "EXT3-fs warning: maximal mount count reached, "
1076 "running e2fsck is recommended\n");
1077 else if (le32_to_cpu(es->s_checkinterval) &&
1078 (le32_to_cpu(es->s_lastcheck) +
1079 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1080 printk (KERN_WARNING
1081 "EXT3-fs warning: checktime reached, "
1082 "running e2fsck is recommended\n");
1084 /* @@@ We _will_ want to clear the valid bit if we find
1085 inconsistencies, to force a fsck at reboot. But for
1086 a plain journaled filesystem we can keep it set as
1087 valid forever! :) */
1088 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1090 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1091 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1092 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1093 es->s_mtime = cpu_to_le32(get_seconds());
1094 ext3_update_dynamic_rev(sb);
1095 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1097 ext3_commit_super(sb, es, 1);
1098 if (test_opt(sb, DEBUG))
1099 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1100 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1102 sbi->s_groups_count,
1103 EXT3_BLOCKS_PER_GROUP(sb),
1104 EXT3_INODES_PER_GROUP(sb),
1107 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1108 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1109 char b[BDEVNAME_SIZE];
1111 printk("external journal on %s\n",
1112 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1114 printk("internal journal\n");
1116 #ifdef CONFIG_EXT3_CHECK
1117 if (test_opt (sb, CHECK)) {
1118 ext3_check_blocks_bitmap (sb);
1119 ext3_check_inodes_bitmap (sb);
1125 /* Called at mount-time, super-block is locked */
1126 static int ext3_check_descriptors (struct super_block * sb)
1128 struct ext3_sb_info *sbi = EXT3_SB(sb);
1129 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1130 struct ext3_group_desc * gdp = NULL;
1134 ext3_debug ("Checking group descriptors");
1136 for (i = 0; i < sbi->s_groups_count; i++)
1138 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1139 gdp = (struct ext3_group_desc *)
1140 sbi->s_group_desc[desc_block++]->b_data;
1141 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1142 le32_to_cpu(gdp->bg_block_bitmap) >=
1143 block + EXT3_BLOCKS_PER_GROUP(sb))
1145 ext3_error (sb, "ext3_check_descriptors",
1146 "Block bitmap for group %d"
1147 " not in group (block %lu)!",
1149 le32_to_cpu(gdp->bg_block_bitmap));
1152 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1153 le32_to_cpu(gdp->bg_inode_bitmap) >=
1154 block + EXT3_BLOCKS_PER_GROUP(sb))
1156 ext3_error (sb, "ext3_check_descriptors",
1157 "Inode bitmap for group %d"
1158 " not in group (block %lu)!",
1160 le32_to_cpu(gdp->bg_inode_bitmap));
1163 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1164 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1165 block + EXT3_BLOCKS_PER_GROUP(sb))
1167 ext3_error (sb, "ext3_check_descriptors",
1168 "Inode table for group %d"
1169 " not in group (block %lu)!",
1171 le32_to_cpu(gdp->bg_inode_table));
1174 block += EXT3_BLOCKS_PER_GROUP(sb);
1178 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1179 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1184 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1185 * the superblock) which were deleted from all directories, but held open by
1186 * a process at the time of a crash. We walk the list and try to delete these
1187 * inodes at recovery time (only with a read-write filesystem).
1189 * In order to keep the orphan inode chain consistent during traversal (in
1190 * case of crash during recovery), we link each inode into the superblock
1191 * orphan list_head and handle it the same way as an inode deletion during
1192 * normal operation (which journals the operations for us).
1194 * We only do an iget() and an iput() on each inode, which is very safe if we
1195 * accidentally point at an in-use or already deleted inode. The worst that
1196 * can happen in this case is that we get a "bit already cleared" message from
1197 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1198 * e2fsck was run on this filesystem, and it must have already done the orphan
1199 * inode cleanup for us, so we can safely abort without any further action.
1201 static void ext3_orphan_cleanup (struct super_block * sb,
1202 struct ext3_super_block * es)
1204 unsigned int s_flags = sb->s_flags;
1205 int nr_orphans = 0, nr_truncates = 0;
1209 if (!es->s_last_orphan) {
1210 jbd_debug(4, "no orphan inodes to clean up\n");
1214 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1215 if (es->s_last_orphan)
1216 jbd_debug(1, "Errors on filesystem, "
1217 "clearing orphan list.\n");
1218 es->s_last_orphan = 0;
1219 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1223 if (s_flags & MS_RDONLY) {
1224 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1226 sb->s_flags &= ~MS_RDONLY;
1229 /* Needed for iput() to work correctly and not trash data */
1230 sb->s_flags |= MS_ACTIVE;
1231 /* Turn on quotas so that they are updated correctly */
1232 for (i = 0; i < MAXQUOTAS; i++) {
1233 if (EXT3_SB(sb)->s_qf_names[i]) {
1234 int ret = ext3_quota_on_mount(sb, i);
1237 "EXT3-fs: Cannot turn on journalled "
1238 "quota: error %d\n", ret);
1243 while (es->s_last_orphan) {
1244 struct inode *inode;
1247 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1248 es->s_last_orphan = 0;
1252 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1254 if (inode->i_nlink) {
1256 "%s: truncating inode %ld to %Ld bytes\n",
1257 __FUNCTION__, inode->i_ino, inode->i_size);
1258 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1259 inode->i_ino, inode->i_size);
1260 ext3_truncate(inode);
1264 "%s: deleting unreferenced inode %ld\n",
1265 __FUNCTION__, inode->i_ino);
1266 jbd_debug(2, "deleting unreferenced inode %ld\n",
1270 iput(inode); /* The delete magic happens here! */
1273 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1276 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1277 sb->s_id, PLURAL(nr_orphans));
1279 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1280 sb->s_id, PLURAL(nr_truncates));
1282 /* Turn quotas off */
1283 for (i = 0; i < MAXQUOTAS; i++) {
1284 if (sb_dqopt(sb)->files[i])
1285 vfs_quota_off(sb, i);
1288 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1291 #define log2(n) ffz(~(n))
1294 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1295 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1296 * We need to be 1 filesystem block less than the 2^32 sector limit.
1298 static loff_t ext3_max_size(int bits)
1300 loff_t res = EXT3_NDIR_BLOCKS;
1301 /* This constant is calculated to be the largest file size for a
1302 * dense, 4k-blocksize file such that the total number of
1303 * sectors in the file, including data and all indirect blocks,
1304 * does not exceed 2^32. */
1305 const loff_t upper_limit = 0x1ff7fffd000LL;
1307 res += 1LL << (bits-2);
1308 res += 1LL << (2*(bits-2));
1309 res += 1LL << (3*(bits-2));
1311 if (res > upper_limit)
1316 static unsigned long descriptor_loc(struct super_block *sb,
1317 unsigned long logic_sb_block,
1320 struct ext3_sb_info *sbi = EXT3_SB(sb);
1321 unsigned long bg, first_data_block, first_meta_bg;
1324 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1325 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1327 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1329 return (logic_sb_block + nr + 1);
1330 bg = sbi->s_desc_per_block * nr;
1331 if (ext3_bg_has_super(sb, bg))
1333 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1337 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1339 struct buffer_head * bh;
1340 struct ext3_super_block *es = NULL;
1341 struct ext3_sb_info *sbi;
1342 unsigned long block;
1343 unsigned long sb_block = get_sb_block(&data);
1344 unsigned long logic_sb_block;
1345 unsigned long offset = 0;
1346 unsigned long journal_inum = 0;
1347 unsigned long def_mount_opts;
1356 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1359 sb->s_fs_info = sbi;
1360 memset(sbi, 0, sizeof(*sbi));
1361 sbi->s_mount_opt = 0;
1362 sbi->s_resuid = EXT3_DEF_RESUID;
1363 sbi->s_resgid = EXT3_DEF_RESGID;
1367 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1369 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1374 * The ext3 superblock will not be buffer aligned for other than 1kB
1375 * block sizes. We need to calculate the offset from buffer start.
1377 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1378 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1379 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1381 logic_sb_block = sb_block;
1384 if (!(bh = sb_bread(sb, logic_sb_block))) {
1385 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1389 * Note: s_es must be initialized as soon as possible because
1390 * some ext3 macro-instructions depend on its value
1392 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1394 sb->s_magic = le16_to_cpu(es->s_magic);
1395 if (sb->s_magic != EXT3_SUPER_MAGIC)
1398 /* Set defaults before we parse the mount options */
1399 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1400 if (def_mount_opts & EXT3_DEFM_DEBUG)
1401 set_opt(sbi->s_mount_opt, DEBUG);
1402 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1403 set_opt(sbi->s_mount_opt, GRPID);
1404 if (def_mount_opts & EXT3_DEFM_UID16)
1405 set_opt(sbi->s_mount_opt, NO_UID32);
1406 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1407 set_opt(sbi->s_mount_opt, XATTR_USER);
1408 if (def_mount_opts & EXT3_DEFM_ACL)
1409 set_opt(sbi->s_mount_opt, POSIX_ACL);
1410 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1411 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1412 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1413 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1414 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1415 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1417 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1418 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1419 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1420 set_opt(sbi->s_mount_opt, ERRORS_RO);
1422 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1423 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1425 set_opt(sbi->s_mount_opt, RESERVATION);
1427 if (!parse_options ((char *) data, sb, &journal_inum, NULL, 0))
1430 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1431 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1433 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1434 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1435 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1436 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1438 "EXT3-fs warning: feature flags set on rev 0 fs, "
1439 "running e2fsck is recommended\n");
1441 * Check feature flags regardless of the revision level, since we
1442 * previously didn't change the revision level when setting the flags,
1443 * so there is a chance incompat flags are set on a rev 0 filesystem.
1445 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1447 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1448 "unsupported optional features (%x).\n",
1449 sb->s_id, le32_to_cpu(features));
1452 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1453 if (!(sb->s_flags & MS_RDONLY) && features) {
1454 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1455 "unsupported optional features (%x).\n",
1456 sb->s_id, le32_to_cpu(features));
1459 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1461 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1462 blocksize > EXT3_MAX_BLOCK_SIZE) {
1464 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1465 blocksize, sb->s_id);
1469 hblock = bdev_hardsect_size(sb->s_bdev);
1470 if (sb->s_blocksize != blocksize) {
1472 * Make sure the blocksize for the filesystem is larger
1473 * than the hardware sectorsize for the machine.
1475 if (blocksize < hblock) {
1476 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1477 "device blocksize %d.\n", blocksize, hblock);
1482 sb_set_blocksize(sb, blocksize);
1483 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1484 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1485 bh = sb_bread(sb, logic_sb_block);
1488 "EXT3-fs: Can't read superblock on 2nd try.\n");
1491 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1493 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1495 "EXT3-fs: Magic mismatch, very weird !\n");
1500 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1502 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1503 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1504 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1506 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1507 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1508 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1509 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1510 (sbi->s_inode_size > blocksize)) {
1512 "EXT3-fs: unsupported inode size: %d\n",
1517 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1518 le32_to_cpu(es->s_log_frag_size);
1519 if (blocksize != sbi->s_frag_size) {
1521 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1522 sbi->s_frag_size, blocksize);
1525 sbi->s_frags_per_block = 1;
1526 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1527 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1528 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1529 if (EXT3_INODE_SIZE(sb) == 0)
1531 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1532 if (sbi->s_inodes_per_block == 0)
1534 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1535 sbi->s_inodes_per_block;
1536 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1538 sbi->s_mount_state = le16_to_cpu(es->s_state);
1539 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1540 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1541 for (i=0; i < 4; i++)
1542 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1543 sbi->s_def_hash_version = es->s_def_hash_version;
1545 if (sbi->s_blocks_per_group > blocksize * 8) {
1547 "EXT3-fs: #blocks per group too big: %lu\n",
1548 sbi->s_blocks_per_group);
1551 if (sbi->s_frags_per_group > blocksize * 8) {
1553 "EXT3-fs: #fragments per group too big: %lu\n",
1554 sbi->s_frags_per_group);
1557 if (sbi->s_inodes_per_group > blocksize * 8) {
1559 "EXT3-fs: #inodes per group too big: %lu\n",
1560 sbi->s_inodes_per_group);
1564 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1566 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1567 le32_to_cpu(es->s_first_data_block) +
1568 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1569 EXT3_BLOCKS_PER_GROUP(sb);
1570 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1571 EXT3_DESC_PER_BLOCK(sb);
1572 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1574 if (sbi->s_group_desc == NULL) {
1575 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1579 percpu_counter_init(&sbi->s_freeblocks_counter);
1580 percpu_counter_init(&sbi->s_freeinodes_counter);
1581 percpu_counter_init(&sbi->s_dirs_counter);
1582 bgl_lock_init(&sbi->s_blockgroup_lock);
1584 for (i = 0; i < db_count; i++) {
1585 block = descriptor_loc(sb, logic_sb_block, i);
1586 sbi->s_group_desc[i] = sb_bread(sb, block);
1587 if (!sbi->s_group_desc[i]) {
1588 printk (KERN_ERR "EXT3-fs: "
1589 "can't read group descriptor %d\n", i);
1594 if (!ext3_check_descriptors (sb)) {
1595 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1598 sbi->s_gdb_count = db_count;
1599 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1600 spin_lock_init(&sbi->s_next_gen_lock);
1601 /* per fileystem reservation list head & lock */
1602 spin_lock_init(&sbi->s_rsv_window_lock);
1603 sbi->s_rsv_window_root = RB_ROOT;
1604 /* Add a single, static dummy reservation to the start of the
1605 * reservation window list --- it gives us a placeholder for
1606 * append-at-start-of-list which makes the allocation logic
1607 * _much_ simpler. */
1608 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1609 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1610 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1611 sbi->s_rsv_window_head.rsv_goal_size = 0;
1612 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1615 * set up enough so that it can read an inode
1617 sb->s_op = &ext3_sops;
1618 sb->s_export_op = &ext3_export_ops;
1619 sb->s_xattr = ext3_xattr_handlers;
1621 sb->s_qcop = &ext3_qctl_operations;
1622 sb->dq_op = &ext3_quota_operations;
1624 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1628 needs_recovery = (es->s_last_orphan != 0 ||
1629 EXT3_HAS_INCOMPAT_FEATURE(sb,
1630 EXT3_FEATURE_INCOMPAT_RECOVER));
1633 * The first inode we look at is the journal inode. Don't try
1634 * root first: it may be modified in the journal!
1636 if (!test_opt(sb, NOLOAD) &&
1637 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1638 if (ext3_load_journal(sb, es))
1640 } else if (journal_inum) {
1641 if (ext3_create_journal(sb, es, journal_inum))
1646 "ext3: No journal on filesystem on %s\n",
1651 /* We have now updated the journal if required, so we can
1652 * validate the data journaling mode. */
1653 switch (test_opt(sb, DATA_FLAGS)) {
1655 /* No mode set, assume a default based on the journal
1656 capabilities: ORDERED_DATA if the journal can
1657 cope, else JOURNAL_DATA */
1658 if (journal_check_available_features
1659 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1660 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1662 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1665 case EXT3_MOUNT_ORDERED_DATA:
1666 case EXT3_MOUNT_WRITEBACK_DATA:
1667 if (!journal_check_available_features
1668 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1669 printk(KERN_ERR "EXT3-fs: Journal does not support "
1670 "requested data journaling mode\n");
1677 if (test_opt(sb, NOBH)) {
1678 if (sb->s_blocksize_bits != PAGE_CACHE_SHIFT) {
1679 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option "
1680 "since filesystem blocksize doesn't match "
1682 clear_opt(sbi->s_mount_opt, NOBH);
1684 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1685 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1686 "its supported only with writeback mode\n");
1687 clear_opt(sbi->s_mount_opt, NOBH);
1691 * The journal_load will have done any necessary log recovery,
1692 * so we can safely mount the rest of the filesystem now.
1695 root = iget(sb, EXT3_ROOT_INO);
1696 sb->s_root = d_alloc_root(root);
1698 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1702 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1705 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1709 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1711 * akpm: core read_super() calls in here with the superblock locked.
1712 * That deadlocks, because orphan cleanup needs to lock the superblock
1713 * in numerous places. Here we just pop the lock - it's relatively
1714 * harmless, because we are now ready to accept write_super() requests,
1715 * and aviro says that's the only reason for hanging onto the
1718 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1719 ext3_orphan_cleanup(sb, es);
1720 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1722 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1723 ext3_mark_recovery_complete(sb, es);
1724 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1725 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1726 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1729 percpu_counter_mod(&sbi->s_freeblocks_counter,
1730 ext3_count_free_blocks(sb));
1731 percpu_counter_mod(&sbi->s_freeinodes_counter,
1732 ext3_count_free_inodes(sb));
1733 percpu_counter_mod(&sbi->s_dirs_counter,
1734 ext3_count_dirs(sb));
1741 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1746 journal_destroy(sbi->s_journal);
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)
1922 int journal_inum = le32_to_cpu(es->s_journal_inum);
1923 dev_t journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1925 int really_read_only;
1927 really_read_only = bdev_read_only(sb->s_bdev);
1930 * Are we loading a blank journal or performing recovery after a
1931 * crash? For recovery, we need to check in advance whether we
1932 * can get read-write access to the device.
1935 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1936 if (sb->s_flags & MS_RDONLY) {
1937 printk(KERN_INFO "EXT3-fs: INFO: recovery "
1938 "required on readonly filesystem.\n");
1939 if (really_read_only) {
1940 printk(KERN_ERR "EXT3-fs: write access "
1941 "unavailable, cannot proceed.\n");
1944 printk (KERN_INFO "EXT3-fs: write access will "
1945 "be enabled during recovery.\n");
1949 if (journal_inum && journal_dev) {
1950 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1951 "and inode journals!\n");
1956 if (!(journal = ext3_get_journal(sb, journal_inum)))
1959 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1963 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1964 err = journal_update_format(journal);
1966 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1967 journal_destroy(journal);
1972 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1973 err = journal_wipe(journal, !really_read_only);
1975 err = journal_load(journal);
1978 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
1979 journal_destroy(journal);
1983 EXT3_SB(sb)->s_journal = journal;
1984 ext3_clear_journal_err(sb, es);
1988 static int ext3_create_journal(struct super_block * sb,
1989 struct ext3_super_block * es,
1994 if (sb->s_flags & MS_RDONLY) {
1995 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
1996 "create journal.\n");
2000 if (!(journal = ext3_get_journal(sb, journal_inum)))
2003 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
2006 if (journal_create(journal)) {
2007 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2008 journal_destroy(journal);
2012 EXT3_SB(sb)->s_journal = journal;
2014 ext3_update_dynamic_rev(sb);
2015 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2016 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2018 es->s_journal_inum = cpu_to_le32(journal_inum);
2021 /* Make sure we flush the recovery flag to disk. */
2022 ext3_commit_super(sb, es, 1);
2027 static void ext3_commit_super (struct super_block * sb,
2028 struct ext3_super_block * es,
2031 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2035 es->s_wtime = cpu_to_le32(get_seconds());
2036 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2037 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2038 BUFFER_TRACE(sbh, "marking dirty");
2039 mark_buffer_dirty(sbh);
2041 sync_dirty_buffer(sbh);
2046 * Have we just finished recovery? If so, and if we are mounting (or
2047 * remounting) the filesystem readonly, then we will end up with a
2048 * consistent fs on disk. Record that fact.
2050 static void ext3_mark_recovery_complete(struct super_block * sb,
2051 struct ext3_super_block * es)
2053 journal_t *journal = EXT3_SB(sb)->s_journal;
2055 journal_lock_updates(journal);
2056 journal_flush(journal);
2057 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2058 sb->s_flags & MS_RDONLY) {
2059 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2061 ext3_commit_super(sb, es, 1);
2063 journal_unlock_updates(journal);
2067 * If we are mounting (or read-write remounting) a filesystem whose journal
2068 * has recorded an error from a previous lifetime, move that error to the
2069 * main filesystem now.
2071 static void ext3_clear_journal_err(struct super_block * sb,
2072 struct ext3_super_block * es)
2078 journal = EXT3_SB(sb)->s_journal;
2081 * Now check for any error status which may have been recorded in the
2082 * journal by a prior ext3_error() or ext3_abort()
2085 j_errno = journal_errno(journal);
2089 errstr = ext3_decode_error(sb, j_errno, nbuf);
2090 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2091 "from previous mount: %s", errstr);
2092 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2093 "filesystem check.");
2095 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2096 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2097 ext3_commit_super (sb, es, 1);
2099 journal_clear_err(journal);
2104 * Force the running and committing transactions to commit,
2105 * and wait on the commit.
2107 int ext3_force_commit(struct super_block *sb)
2112 if (sb->s_flags & MS_RDONLY)
2115 journal = EXT3_SB(sb)->s_journal;
2117 ret = ext3_journal_force_commit(journal);
2122 * Ext3 always journals updates to the superblock itself, so we don't
2123 * have to propagate any other updates to the superblock on disk at this
2124 * point. Just start an async writeback to get the buffers on their way
2127 * This implicitly triggers the writebehind on sync().
2130 static void ext3_write_super (struct super_block * sb)
2132 if (down_trylock(&sb->s_lock) == 0)
2137 static int ext3_sync_fs(struct super_block *sb, int wait)
2142 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2144 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2150 * LVM calls this function before a (read-only) snapshot is created. This
2151 * gives us a chance to flush the journal completely and mark the fs clean.
2153 static void ext3_write_super_lockfs(struct super_block *sb)
2157 if (!(sb->s_flags & MS_RDONLY)) {
2158 journal_t *journal = EXT3_SB(sb)->s_journal;
2160 /* Now we set up the journal barrier. */
2161 journal_lock_updates(journal);
2162 journal_flush(journal);
2164 /* Journal blocked and flushed, clear needs_recovery flag. */
2165 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2166 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2171 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2172 * flag here, even though the filesystem is not technically dirty yet.
2174 static void ext3_unlockfs(struct super_block *sb)
2176 if (!(sb->s_flags & MS_RDONLY)) {
2178 /* Reser the needs_recovery flag before the fs is unlocked. */
2179 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2180 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2182 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2186 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2188 struct ext3_super_block * es;
2189 struct ext3_sb_info *sbi = EXT3_SB(sb);
2190 unsigned long n_blocks_count = 0;
2191 unsigned long old_sb_flags;
2192 struct ext3_mount_options old_opts;
2198 /* Store the original options */
2199 old_sb_flags = sb->s_flags;
2200 old_opts.s_mount_opt = sbi->s_mount_opt;
2201 old_opts.s_resuid = sbi->s_resuid;
2202 old_opts.s_resgid = sbi->s_resgid;
2203 old_opts.s_commit_interval = sbi->s_commit_interval;
2205 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2206 for (i = 0; i < MAXQUOTAS; i++)
2207 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2211 * Allow the "check" option to be passed as a remount option.
2213 if (!parse_options(data, sb, NULL, &n_blocks_count, 1)) {
2218 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2219 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2221 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2222 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2226 ext3_init_journal_params(sb, sbi->s_journal);
2228 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2229 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2230 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2235 if (*flags & MS_RDONLY) {
2237 * First of all, the unconditional stuff we have to do
2238 * to disable replay of the journal when we next remount
2240 sb->s_flags |= MS_RDONLY;
2243 * OK, test if we are remounting a valid rw partition
2244 * readonly, and if so set the rdonly flag and then
2245 * mark the partition as valid again.
2247 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2248 (sbi->s_mount_state & EXT3_VALID_FS))
2249 es->s_state = cpu_to_le16(sbi->s_mount_state);
2251 ext3_mark_recovery_complete(sb, es);
2254 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2255 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2256 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2257 "remount RDWR because of unsupported "
2258 "optional features (%x).\n",
2259 sb->s_id, le32_to_cpu(ret));
2264 * Mounting a RDONLY partition read-write, so reread
2265 * and store the current valid flag. (It may have
2266 * been changed by e2fsck since we originally mounted
2269 ext3_clear_journal_err(sb, es);
2270 sbi->s_mount_state = le16_to_cpu(es->s_state);
2271 if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2275 if (!ext3_setup_super (sb, es, 0))
2276 sb->s_flags &= ~MS_RDONLY;
2280 /* Release old quota file names */
2281 for (i = 0; i < MAXQUOTAS; i++)
2282 if (old_opts.s_qf_names[i] &&
2283 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2284 kfree(old_opts.s_qf_names[i]);
2288 sb->s_flags = old_sb_flags;
2289 sbi->s_mount_opt = old_opts.s_mount_opt;
2290 sbi->s_resuid = old_opts.s_resuid;
2291 sbi->s_resgid = old_opts.s_resgid;
2292 sbi->s_commit_interval = old_opts.s_commit_interval;
2294 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2295 for (i = 0; i < MAXQUOTAS; i++) {
2296 if (sbi->s_qf_names[i] &&
2297 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2298 kfree(sbi->s_qf_names[i]);
2299 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2305 static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
2307 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
2308 unsigned long overhead;
2311 if (test_opt (sb, MINIX_DF))
2314 unsigned long ngroups;
2315 ngroups = EXT3_SB(sb)->s_groups_count;
2319 * Compute the overhead (FS structures)
2323 * All of the blocks before first_data_block are
2326 overhead = le32_to_cpu(es->s_first_data_block);
2329 * Add the overhead attributed to the superblock and
2330 * block group descriptors. If the sparse superblocks
2331 * feature is turned on, then not all groups have this.
2333 for (i = 0; i < ngroups; i++) {
2334 overhead += ext3_bg_has_super(sb, i) +
2335 ext3_bg_num_gdb(sb, i);
2340 * Every block group has an inode bitmap, a block
2341 * bitmap, and an inode table.
2343 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2346 buf->f_type = EXT3_SUPER_MAGIC;
2347 buf->f_bsize = sb->s_blocksize;
2348 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2349 buf->f_bfree = ext3_count_free_blocks (sb);
2350 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2351 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2353 buf->f_files = le32_to_cpu(es->s_inodes_count);
2354 buf->f_ffree = ext3_count_free_inodes (sb);
2355 buf->f_namelen = EXT3_NAME_LEN;
2359 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2360 * is locked for write. Otherwise the are possible deadlocks:
2361 * Process 1 Process 2
2362 * ext3_create() quota_sync()
2363 * journal_start() write_dquot()
2364 * DQUOT_INIT() down(dqio_sem)
2365 * down(dqio_sem) journal_start()
2371 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2373 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2376 static int ext3_dquot_initialize(struct inode *inode, int type)
2381 /* We may create quota structure so we need to reserve enough blocks */
2382 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2384 return PTR_ERR(handle);
2385 ret = dquot_initialize(inode, type);
2386 err = ext3_journal_stop(handle);
2392 static int ext3_dquot_drop(struct inode *inode)
2397 /* We may delete quota structure so we need to reserve enough blocks */
2398 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2400 return PTR_ERR(handle);
2401 ret = dquot_drop(inode);
2402 err = ext3_journal_stop(handle);
2408 static int ext3_write_dquot(struct dquot *dquot)
2412 struct inode *inode;
2414 inode = dquot_to_inode(dquot);
2415 handle = ext3_journal_start(inode,
2416 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2418 return PTR_ERR(handle);
2419 ret = dquot_commit(dquot);
2420 err = ext3_journal_stop(handle);
2426 static int ext3_acquire_dquot(struct dquot *dquot)
2431 handle = ext3_journal_start(dquot_to_inode(dquot),
2432 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2434 return PTR_ERR(handle);
2435 ret = dquot_acquire(dquot);
2436 err = ext3_journal_stop(handle);
2442 static int ext3_release_dquot(struct dquot *dquot)
2447 handle = ext3_journal_start(dquot_to_inode(dquot),
2448 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2450 return PTR_ERR(handle);
2451 ret = dquot_release(dquot);
2452 err = ext3_journal_stop(handle);
2458 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2460 /* Are we journalling quotas? */
2461 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2462 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2463 dquot_mark_dquot_dirty(dquot);
2464 return ext3_write_dquot(dquot);
2466 return dquot_mark_dquot_dirty(dquot);
2470 static int ext3_write_info(struct super_block *sb, int type)
2475 /* Data block + inode block */
2476 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2478 return PTR_ERR(handle);
2479 ret = dquot_commit_info(sb, type);
2480 err = ext3_journal_stop(handle);
2487 * Turn on quotas during mount time - we need to find
2488 * the quota file and such...
2490 static int ext3_quota_on_mount(struct super_block *sb, int type)
2492 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2493 EXT3_SB(sb)->s_jquota_fmt, type);
2497 * Standard function to be called on quota_on
2499 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2503 struct nameidata nd;
2505 if (!test_opt(sb, QUOTA))
2507 /* Not journalling quota? */
2508 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2509 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2510 return vfs_quota_on(sb, type, format_id, path);
2511 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2514 /* Quotafile not on the same filesystem? */
2515 if (nd.mnt->mnt_sb != sb) {
2519 /* Quotafile not of fs root? */
2520 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2522 "EXT3-fs: Quota file not on filesystem root. "
2523 "Journalled quota will not work.\n");
2525 return vfs_quota_on(sb, type, format_id, path);
2528 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2529 * acquiring the locks... As quota files are never truncated and quota code
2530 * itself serializes the operations (and noone else should touch the files)
2531 * we don't have to be afraid of races */
2532 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2533 size_t len, loff_t off)
2535 struct inode *inode = sb_dqopt(sb)->files[type];
2536 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2538 int offset = off & (sb->s_blocksize - 1);
2541 struct buffer_head *bh;
2542 loff_t i_size = i_size_read(inode);
2546 if (off+len > i_size)
2549 while (toread > 0) {
2550 tocopy = sb->s_blocksize - offset < toread ?
2551 sb->s_blocksize - offset : toread;
2552 bh = ext3_bread(NULL, inode, blk, 0, &err);
2555 if (!bh) /* A hole? */
2556 memset(data, 0, tocopy);
2558 memcpy(data, bh->b_data+offset, tocopy);
2568 /* Write to quotafile (we know the transaction is already started and has
2569 * enough credits) */
2570 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2571 const char *data, size_t len, loff_t off)
2573 struct inode *inode = sb_dqopt(sb)->files[type];
2574 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2576 int offset = off & (sb->s_blocksize - 1);
2578 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2579 size_t towrite = len;
2580 struct buffer_head *bh;
2581 handle_t *handle = journal_current_handle();
2583 down(&inode->i_sem);
2584 while (towrite > 0) {
2585 tocopy = sb->s_blocksize - offset < towrite ?
2586 sb->s_blocksize - offset : towrite;
2587 bh = ext3_bread(handle, inode, blk, 1, &err);
2590 if (journal_quota) {
2591 err = ext3_journal_get_write_access(handle, bh);
2598 memcpy(bh->b_data+offset, data, tocopy);
2599 flush_dcache_page(bh->b_page);
2602 err = ext3_journal_dirty_metadata(handle, bh);
2604 /* Always do at least ordered writes for quotas */
2605 err = ext3_journal_dirty_data(handle, bh);
2606 mark_buffer_dirty(bh);
2619 if (inode->i_size < off+len-towrite) {
2620 i_size_write(inode, off+len-towrite);
2621 EXT3_I(inode)->i_disksize = inode->i_size;
2624 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2625 ext3_mark_inode_dirty(handle, inode);
2627 return len - towrite;
2632 static struct super_block *ext3_get_sb(struct file_system_type *fs_type,
2633 int flags, const char *dev_name, void *data)
2635 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
2638 static struct file_system_type ext3_fs_type = {
2639 .owner = THIS_MODULE,
2641 .get_sb = ext3_get_sb,
2642 .kill_sb = kill_block_super,
2643 .fs_flags = FS_REQUIRES_DEV,
2646 static int __init init_ext3_fs(void)
2648 int err = init_ext3_xattr();
2651 err = init_inodecache();
2654 err = register_filesystem(&ext3_fs_type);
2659 destroy_inodecache();
2665 static void __exit exit_ext3_fs(void)
2667 unregister_filesystem(&ext3_fs_type);
2668 destroy_inodecache();
2672 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2673 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2674 MODULE_LICENSE("GPL");
2675 module_init(init_ext3_fs)
2676 module_exit(exit_ext3_fs)