ia64/linux-2.6.18-xen.hg

view fs/ext3/super.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 3e8752eb6d9c
children cad6f60f0506
line source
1 /*
2 * linux/fs/ext3/super.c
3 *
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)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
19 #include <linux/module.h>
20 #include <linux/string.h>
21 #include <linux/fs.h>
22 #include <linux/time.h>
23 #include <linux/jbd.h>
24 #include <linux/ext3_fs.h>
25 #include <linux/ext3_jbd.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/blkdev.h>
29 #include <linux/parser.h>
30 #include <linux/smp_lock.h>
31 #include <linux/buffer_head.h>
32 #include <linux/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
39 #include <asm/uaccess.h>
41 #include "xattr.h"
42 #include "acl.h"
43 #include "namei.h"
45 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
46 unsigned long journal_devnum);
47 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
48 int);
49 static void ext3_commit_super (struct super_block * sb,
50 struct ext3_super_block * es,
51 int sync);
52 static void ext3_mark_recovery_complete(struct super_block * sb,
53 struct ext3_super_block * es);
54 static void ext3_clear_journal_err(struct super_block * sb,
55 struct ext3_super_block * es);
56 static int ext3_sync_fs(struct super_block *sb, int wait);
57 static const char *ext3_decode_error(struct super_block * sb, int errno,
58 char nbuf[16]);
59 static int ext3_remount (struct super_block * sb, int * flags, char * data);
60 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
61 static void ext3_unlockfs(struct super_block *sb);
62 static void ext3_write_super (struct super_block * sb);
63 static void ext3_write_super_lockfs(struct super_block *sb);
65 /*
66 * Wrappers for journal_start/end.
67 *
68 * The only special thing we need to do here is to make sure that all
69 * journal_end calls result in the superblock being marked dirty, so
70 * that sync() will call the filesystem's write_super callback if
71 * appropriate.
72 */
73 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
74 {
75 journal_t *journal;
77 if (sb->s_flags & MS_RDONLY)
78 return ERR_PTR(-EROFS);
80 /* Special case here: if the journal has aborted behind our
81 * backs (eg. EIO in the commit thread), then we still need to
82 * take the FS itself readonly cleanly. */
83 journal = EXT3_SB(sb)->s_journal;
84 if (is_journal_aborted(journal)) {
85 ext3_abort(sb, __FUNCTION__,
86 "Detected aborted journal");
87 return ERR_PTR(-EROFS);
88 }
90 return journal_start(journal, nblocks);
91 }
93 /*
94 * The only special thing we need to do here is to make sure that all
95 * journal_stop calls result in the superblock being marked dirty, so
96 * that sync() will call the filesystem's write_super callback if
97 * appropriate.
98 */
99 int __ext3_journal_stop(const char *where, handle_t *handle)
100 {
101 struct super_block *sb;
102 int err;
103 int rc;
105 sb = handle->h_transaction->t_journal->j_private;
106 err = handle->h_err;
107 rc = journal_stop(handle);
109 if (!err)
110 err = rc;
111 if (err)
112 __ext3_std_error(sb, where, err);
113 return err;
114 }
116 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
117 struct buffer_head *bh, handle_t *handle, int err)
118 {
119 char nbuf[16];
120 const char *errstr = ext3_decode_error(NULL, err, nbuf);
122 if (bh)
123 BUFFER_TRACE(bh, "abort");
125 if (!handle->h_err)
126 handle->h_err = err;
128 if (is_handle_aborted(handle))
129 return;
131 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
132 caller, errstr, err_fn);
134 journal_abort_handle(handle);
135 }
137 /* Deal with the reporting of failure conditions on a filesystem such as
138 * inconsistencies detected or read IO failures.
139 *
140 * On ext2, we can store the error state of the filesystem in the
141 * superblock. That is not possible on ext3, because we may have other
142 * write ordering constraints on the superblock which prevent us from
143 * writing it out straight away; and given that the journal is about to
144 * be aborted, we can't rely on the current, or future, transactions to
145 * write out the superblock safely.
146 *
147 * We'll just use the journal_abort() error code to record an error in
148 * the journal instead. On recovery, the journal will compain about
149 * that error until we've noted it down and cleared it.
150 */
152 static void ext3_handle_error(struct super_block *sb)
153 {
154 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
156 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
157 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
159 if (sb->s_flags & MS_RDONLY)
160 return;
162 if (test_opt (sb, ERRORS_RO)) {
163 printk (KERN_CRIT "Remounting filesystem read-only\n");
164 sb->s_flags |= MS_RDONLY;
165 } else {
166 journal_t *journal = EXT3_SB(sb)->s_journal;
168 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
169 if (journal)
170 journal_abort(journal, -EIO);
171 }
172 if (test_opt(sb, ERRORS_PANIC))
173 panic("EXT3-fs (device %s): panic forced after error\n",
174 sb->s_id);
175 ext3_commit_super(sb, es, 1);
176 }
178 void ext3_error (struct super_block * sb, const char * function,
179 const char * fmt, ...)
180 {
181 va_list args;
183 va_start(args, fmt);
184 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
185 vprintk(fmt, args);
186 printk("\n");
187 va_end(args);
189 ext3_handle_error(sb);
190 }
192 static const char *ext3_decode_error(struct super_block * sb, int errno,
193 char nbuf[16])
194 {
195 char *errstr = NULL;
197 switch (errno) {
198 case -EIO:
199 errstr = "IO failure";
200 break;
201 case -ENOMEM:
202 errstr = "Out of memory";
203 break;
204 case -EROFS:
205 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
206 errstr = "Journal has aborted";
207 else
208 errstr = "Readonly filesystem";
209 break;
210 default:
211 /* If the caller passed in an extra buffer for unknown
212 * errors, textualise them now. Else we just return
213 * NULL. */
214 if (nbuf) {
215 /* Check for truncated error codes... */
216 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
217 errstr = nbuf;
218 }
219 break;
220 }
222 return errstr;
223 }
225 /* __ext3_std_error decodes expected errors from journaling functions
226 * automatically and invokes the appropriate error response. */
228 void __ext3_std_error (struct super_block * sb, const char * function,
229 int errno)
230 {
231 char nbuf[16];
232 const char *errstr;
234 /* Special case: if the error is EROFS, and we're not already
235 * inside a transaction, then there's really no point in logging
236 * an error. */
237 if (errno == -EROFS && journal_current_handle() == NULL &&
238 (sb->s_flags & MS_RDONLY))
239 return;
241 errstr = ext3_decode_error(sb, errno, nbuf);
242 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
243 sb->s_id, function, errstr);
245 ext3_handle_error(sb);
246 }
248 /*
249 * ext3_abort is a much stronger failure handler than ext3_error. The
250 * abort function may be used to deal with unrecoverable failures such
251 * as journal IO errors or ENOMEM at a critical moment in log management.
252 *
253 * We unconditionally force the filesystem into an ABORT|READONLY state,
254 * unless the error response on the fs has been set to panic in which
255 * case we take the easy way out and panic immediately.
256 */
258 void ext3_abort (struct super_block * sb, const char * function,
259 const char * fmt, ...)
260 {
261 va_list args;
263 printk (KERN_CRIT "ext3_abort called.\n");
265 va_start(args, fmt);
266 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
267 vprintk(fmt, args);
268 printk("\n");
269 va_end(args);
271 if (test_opt(sb, ERRORS_PANIC))
272 panic("EXT3-fs panic from previous error\n");
274 if (sb->s_flags & MS_RDONLY)
275 return;
277 printk(KERN_CRIT "Remounting filesystem read-only\n");
278 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
279 sb->s_flags |= MS_RDONLY;
280 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
281 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
282 }
284 void ext3_warning (struct super_block * sb, const char * function,
285 const char * fmt, ...)
286 {
287 va_list args;
289 va_start(args, fmt);
290 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
291 sb->s_id, function);
292 vprintk(fmt, args);
293 printk("\n");
294 va_end(args);
295 }
297 void ext3_update_dynamic_rev(struct super_block *sb)
298 {
299 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
301 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
302 return;
304 ext3_warning(sb, __FUNCTION__,
305 "updating to rev %d because of new feature flag, "
306 "running e2fsck is recommended",
307 EXT3_DYNAMIC_REV);
309 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
310 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
311 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
312 /* leave es->s_feature_*compat flags alone */
313 /* es->s_uuid will be set by e2fsck if empty */
315 /*
316 * The rest of the superblock fields should be zero, and if not it
317 * means they are likely already in use, so leave them alone. We
318 * can leave it up to e2fsck to clean up any inconsistencies there.
319 */
320 }
322 /*
323 * Open the external journal device
324 */
325 static struct block_device *ext3_blkdev_get(dev_t dev)
326 {
327 struct block_device *bdev;
328 char b[BDEVNAME_SIZE];
330 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
331 if (IS_ERR(bdev))
332 goto fail;
333 return bdev;
335 fail:
336 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
337 __bdevname(dev, b), PTR_ERR(bdev));
338 return NULL;
339 }
341 /*
342 * Release the journal device
343 */
344 static int ext3_blkdev_put(struct block_device *bdev)
345 {
346 bd_release(bdev);
347 return blkdev_put(bdev);
348 }
350 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
351 {
352 struct block_device *bdev;
353 int ret = -ENODEV;
355 bdev = sbi->journal_bdev;
356 if (bdev) {
357 ret = ext3_blkdev_put(bdev);
358 sbi->journal_bdev = NULL;
359 }
360 return ret;
361 }
363 static inline struct inode *orphan_list_entry(struct list_head *l)
364 {
365 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
366 }
368 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
369 {
370 struct list_head *l;
372 printk(KERN_ERR "sb orphan head is %d\n",
373 le32_to_cpu(sbi->s_es->s_last_orphan));
375 printk(KERN_ERR "sb_info orphan list:\n");
376 list_for_each(l, &sbi->s_orphan) {
377 struct inode *inode = orphan_list_entry(l);
378 printk(KERN_ERR " "
379 "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
380 inode->i_sb->s_id, inode->i_ino, inode,
381 inode->i_mode, inode->i_nlink,
382 NEXT_ORPHAN(inode));
383 }
384 }
386 static void ext3_put_super (struct super_block * sb)
387 {
388 struct ext3_sb_info *sbi = EXT3_SB(sb);
389 struct ext3_super_block *es = sbi->s_es;
390 int i;
392 ext3_xattr_put_super(sb);
393 journal_destroy(sbi->s_journal);
394 if (!(sb->s_flags & MS_RDONLY)) {
395 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
396 es->s_state = cpu_to_le16(sbi->s_mount_state);
397 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
398 mark_buffer_dirty(sbi->s_sbh);
399 ext3_commit_super(sb, es, 1);
400 }
402 for (i = 0; i < sbi->s_gdb_count; i++)
403 brelse(sbi->s_group_desc[i]);
404 kfree(sbi->s_group_desc);
405 percpu_counter_destroy(&sbi->s_freeblocks_counter);
406 percpu_counter_destroy(&sbi->s_freeinodes_counter);
407 percpu_counter_destroy(&sbi->s_dirs_counter);
408 brelse(sbi->s_sbh);
409 #ifdef CONFIG_QUOTA
410 for (i = 0; i < MAXQUOTAS; i++)
411 kfree(sbi->s_qf_names[i]);
412 #endif
414 /* Debugging code just in case the in-memory inode orphan list
415 * isn't empty. The on-disk one can be non-empty if we've
416 * detected an error and taken the fs readonly, but the
417 * in-memory list had better be clean by this point. */
418 if (!list_empty(&sbi->s_orphan))
419 dump_orphan_list(sb, sbi);
420 J_ASSERT(list_empty(&sbi->s_orphan));
422 invalidate_bdev(sb->s_bdev, 0);
423 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
424 /*
425 * Invalidate the journal device's buffers. We don't want them
426 * floating about in memory - the physical journal device may
427 * hotswapped, and it breaks the `ro-after' testing code.
428 */
429 sync_blockdev(sbi->journal_bdev);
430 invalidate_bdev(sbi->journal_bdev, 0);
431 ext3_blkdev_remove(sbi);
432 }
433 sb->s_fs_info = NULL;
434 kfree(sbi);
435 return;
436 }
438 static kmem_cache_t *ext3_inode_cachep;
440 /*
441 * Called inside transaction, so use GFP_NOFS
442 */
443 static struct inode *ext3_alloc_inode(struct super_block *sb)
444 {
445 struct ext3_inode_info *ei;
447 ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
448 if (!ei)
449 return NULL;
450 #ifdef CONFIG_EXT3_FS_POSIX_ACL
451 ei->i_acl = EXT3_ACL_NOT_CACHED;
452 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
453 #endif
454 ei->i_block_alloc_info = NULL;
455 ei->vfs_inode.i_version = 1;
456 return &ei->vfs_inode;
457 }
459 static void ext3_destroy_inode(struct inode *inode)
460 {
461 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
462 }
464 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
465 {
466 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
468 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
469 SLAB_CTOR_CONSTRUCTOR) {
470 INIT_LIST_HEAD(&ei->i_orphan);
471 #ifdef CONFIG_EXT3_FS_XATTR
472 init_rwsem(&ei->xattr_sem);
473 #endif
474 mutex_init(&ei->truncate_mutex);
475 inode_init_once(&ei->vfs_inode);
476 }
477 }
479 static int init_inodecache(void)
480 {
481 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
482 sizeof(struct ext3_inode_info),
483 0, (SLAB_RECLAIM_ACCOUNT|
484 SLAB_MEM_SPREAD),
485 init_once, NULL);
486 if (ext3_inode_cachep == NULL)
487 return -ENOMEM;
488 return 0;
489 }
491 static void destroy_inodecache(void)
492 {
493 if (kmem_cache_destroy(ext3_inode_cachep))
494 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
495 }
497 static void ext3_clear_inode(struct inode *inode)
498 {
499 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
500 #ifdef CONFIG_EXT3_FS_POSIX_ACL
501 if (EXT3_I(inode)->i_acl &&
502 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
503 posix_acl_release(EXT3_I(inode)->i_acl);
504 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
505 }
506 if (EXT3_I(inode)->i_default_acl &&
507 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
508 posix_acl_release(EXT3_I(inode)->i_default_acl);
509 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
510 }
511 #endif
512 ext3_discard_reservation(inode);
513 EXT3_I(inode)->i_block_alloc_info = NULL;
514 if (unlikely(rsv))
515 kfree(rsv);
516 }
518 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
519 {
520 #if defined(CONFIG_QUOTA)
521 struct ext3_sb_info *sbi = EXT3_SB(sb);
523 if (sbi->s_jquota_fmt)
524 seq_printf(seq, ",jqfmt=%s",
525 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
527 if (sbi->s_qf_names[USRQUOTA])
528 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
530 if (sbi->s_qf_names[GRPQUOTA])
531 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
533 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
534 seq_puts(seq, ",usrquota");
536 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
537 seq_puts(seq, ",grpquota");
538 #endif
539 }
541 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
542 {
543 struct super_block *sb = vfs->mnt_sb;
545 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
546 seq_puts(seq, ",data=journal");
547 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
548 seq_puts(seq, ",data=ordered");
549 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
550 seq_puts(seq, ",data=writeback");
552 ext3_show_quota_options(seq, sb);
554 return 0;
555 }
558 static struct dentry *ext3_get_dentry(struct super_block *sb, void *vobjp)
559 {
560 __u32 *objp = vobjp;
561 unsigned long ino = objp[0];
562 __u32 generation = objp[1];
563 struct inode *inode;
564 struct dentry *result;
566 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
567 return ERR_PTR(-ESTALE);
568 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
569 return ERR_PTR(-ESTALE);
571 /* iget isn't really right if the inode is currently unallocated!!
572 *
573 * ext3_read_inode will return a bad_inode if the inode had been
574 * deleted, so we should be safe.
575 *
576 * Currently we don't know the generation for parent directory, so
577 * a generation of 0 means "accept any"
578 */
579 inode = iget(sb, ino);
580 if (inode == NULL)
581 return ERR_PTR(-ENOMEM);
582 if (is_bad_inode(inode) ||
583 (generation && inode->i_generation != generation)) {
584 iput(inode);
585 return ERR_PTR(-ESTALE);
586 }
587 /* now to find a dentry.
588 * If possible, get a well-connected one
589 */
590 result = d_alloc_anon(inode);
591 if (!result) {
592 iput(inode);
593 return ERR_PTR(-ENOMEM);
594 }
595 return result;
596 }
598 #ifdef CONFIG_QUOTA
599 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
600 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
602 static int ext3_dquot_initialize(struct inode *inode, int type);
603 static int ext3_dquot_drop(struct inode *inode);
604 static int ext3_write_dquot(struct dquot *dquot);
605 static int ext3_acquire_dquot(struct dquot *dquot);
606 static int ext3_release_dquot(struct dquot *dquot);
607 static int ext3_mark_dquot_dirty(struct dquot *dquot);
608 static int ext3_write_info(struct super_block *sb, int type);
609 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
610 static int ext3_quota_on_mount(struct super_block *sb, int type);
611 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
612 size_t len, loff_t off);
613 static ssize_t ext3_quota_write(struct super_block *sb, int type,
614 const char *data, size_t len, loff_t off);
616 static struct dquot_operations ext3_quota_operations = {
617 .initialize = ext3_dquot_initialize,
618 .drop = ext3_dquot_drop,
619 .alloc_space = dquot_alloc_space,
620 .alloc_inode = dquot_alloc_inode,
621 .free_space = dquot_free_space,
622 .free_inode = dquot_free_inode,
623 .transfer = dquot_transfer,
624 .write_dquot = ext3_write_dquot,
625 .acquire_dquot = ext3_acquire_dquot,
626 .release_dquot = ext3_release_dquot,
627 .mark_dirty = ext3_mark_dquot_dirty,
628 .write_info = ext3_write_info
629 };
631 static struct quotactl_ops ext3_qctl_operations = {
632 .quota_on = ext3_quota_on,
633 .quota_off = vfs_quota_off,
634 .quota_sync = vfs_quota_sync,
635 .get_info = vfs_get_dqinfo,
636 .set_info = vfs_set_dqinfo,
637 .get_dqblk = vfs_get_dqblk,
638 .set_dqblk = vfs_set_dqblk
639 };
640 #endif
642 static struct super_operations ext3_sops = {
643 .alloc_inode = ext3_alloc_inode,
644 .destroy_inode = ext3_destroy_inode,
645 .read_inode = ext3_read_inode,
646 .write_inode = ext3_write_inode,
647 .dirty_inode = ext3_dirty_inode,
648 .delete_inode = ext3_delete_inode,
649 .put_super = ext3_put_super,
650 .write_super = ext3_write_super,
651 .sync_fs = ext3_sync_fs,
652 .write_super_lockfs = ext3_write_super_lockfs,
653 .unlockfs = ext3_unlockfs,
654 .statfs = ext3_statfs,
655 .remount_fs = ext3_remount,
656 .clear_inode = ext3_clear_inode,
657 .show_options = ext3_show_options,
658 #ifdef CONFIG_QUOTA
659 .quota_read = ext3_quota_read,
660 .quota_write = ext3_quota_write,
661 #endif
662 };
664 static struct export_operations ext3_export_ops = {
665 .get_parent = ext3_get_parent,
666 .get_dentry = ext3_get_dentry,
667 };
669 enum {
670 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
671 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
672 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
673 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
674 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
675 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
676 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
677 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
678 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
679 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
680 Opt_grpquota
681 };
683 static match_table_t tokens = {
684 {Opt_bsd_df, "bsddf"},
685 {Opt_minix_df, "minixdf"},
686 {Opt_grpid, "grpid"},
687 {Opt_grpid, "bsdgroups"},
688 {Opt_nogrpid, "nogrpid"},
689 {Opt_nogrpid, "sysvgroups"},
690 {Opt_resgid, "resgid=%u"},
691 {Opt_resuid, "resuid=%u"},
692 {Opt_sb, "sb=%u"},
693 {Opt_err_cont, "errors=continue"},
694 {Opt_err_panic, "errors=panic"},
695 {Opt_err_ro, "errors=remount-ro"},
696 {Opt_nouid32, "nouid32"},
697 {Opt_nocheck, "nocheck"},
698 {Opt_nocheck, "check=none"},
699 {Opt_debug, "debug"},
700 {Opt_oldalloc, "oldalloc"},
701 {Opt_orlov, "orlov"},
702 {Opt_user_xattr, "user_xattr"},
703 {Opt_nouser_xattr, "nouser_xattr"},
704 {Opt_acl, "acl"},
705 {Opt_noacl, "noacl"},
706 {Opt_reservation, "reservation"},
707 {Opt_noreservation, "noreservation"},
708 {Opt_noload, "noload"},
709 {Opt_nobh, "nobh"},
710 {Opt_bh, "bh"},
711 {Opt_commit, "commit=%u"},
712 {Opt_journal_update, "journal=update"},
713 {Opt_journal_inum, "journal=%u"},
714 {Opt_journal_dev, "journal_dev=%u"},
715 {Opt_abort, "abort"},
716 {Opt_data_journal, "data=journal"},
717 {Opt_data_ordered, "data=ordered"},
718 {Opt_data_writeback, "data=writeback"},
719 {Opt_offusrjquota, "usrjquota="},
720 {Opt_usrjquota, "usrjquota=%s"},
721 {Opt_offgrpjquota, "grpjquota="},
722 {Opt_grpjquota, "grpjquota=%s"},
723 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
724 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
725 {Opt_grpquota, "grpquota"},
726 {Opt_noquota, "noquota"},
727 {Opt_quota, "quota"},
728 {Opt_usrquota, "usrquota"},
729 {Opt_barrier, "barrier=%u"},
730 {Opt_err, NULL},
731 {Opt_resize, "resize"},
732 };
734 static ext3_fsblk_t get_sb_block(void **data)
735 {
736 ext3_fsblk_t sb_block;
737 char *options = (char *) *data;
739 if (!options || strncmp(options, "sb=", 3) != 0)
740 return 1; /* Default location */
741 options += 3;
742 /*todo: use simple_strtoll with >32bit ext3 */
743 sb_block = simple_strtoul(options, &options, 0);
744 if (*options && *options != ',') {
745 printk("EXT3-fs: Invalid sb specification: %s\n",
746 (char *) *data);
747 return 1;
748 }
749 if (*options == ',')
750 options++;
751 *data = (void *) options;
752 return sb_block;
753 }
755 static int parse_options (char *options, struct super_block *sb,
756 unsigned long *inum, unsigned long *journal_devnum,
757 ext3_fsblk_t *n_blocks_count, int is_remount)
758 {
759 struct ext3_sb_info *sbi = EXT3_SB(sb);
760 char * p;
761 substring_t args[MAX_OPT_ARGS];
762 int data_opt = 0;
763 int option;
764 #ifdef CONFIG_QUOTA
765 int qtype;
766 char *qname;
767 #endif
769 if (!options)
770 return 1;
772 while ((p = strsep (&options, ",")) != NULL) {
773 int token;
774 if (!*p)
775 continue;
777 token = match_token(p, tokens, args);
778 switch (token) {
779 case Opt_bsd_df:
780 clear_opt (sbi->s_mount_opt, MINIX_DF);
781 break;
782 case Opt_minix_df:
783 set_opt (sbi->s_mount_opt, MINIX_DF);
784 break;
785 case Opt_grpid:
786 set_opt (sbi->s_mount_opt, GRPID);
787 break;
788 case Opt_nogrpid:
789 clear_opt (sbi->s_mount_opt, GRPID);
790 break;
791 case Opt_resuid:
792 if (match_int(&args[0], &option))
793 return 0;
794 sbi->s_resuid = option;
795 break;
796 case Opt_resgid:
797 if (match_int(&args[0], &option))
798 return 0;
799 sbi->s_resgid = option;
800 break;
801 case Opt_sb:
802 /* handled by get_sb_block() instead of here */
803 /* *sb_block = match_int(&args[0]); */
804 break;
805 case Opt_err_panic:
806 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
807 clear_opt (sbi->s_mount_opt, ERRORS_RO);
808 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
809 break;
810 case Opt_err_ro:
811 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
812 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
813 set_opt (sbi->s_mount_opt, ERRORS_RO);
814 break;
815 case Opt_err_cont:
816 clear_opt (sbi->s_mount_opt, ERRORS_RO);
817 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
818 set_opt (sbi->s_mount_opt, ERRORS_CONT);
819 break;
820 case Opt_nouid32:
821 set_opt (sbi->s_mount_opt, NO_UID32);
822 break;
823 case Opt_nocheck:
824 clear_opt (sbi->s_mount_opt, CHECK);
825 break;
826 case Opt_debug:
827 set_opt (sbi->s_mount_opt, DEBUG);
828 break;
829 case Opt_oldalloc:
830 set_opt (sbi->s_mount_opt, OLDALLOC);
831 break;
832 case Opt_orlov:
833 clear_opt (sbi->s_mount_opt, OLDALLOC);
834 break;
835 #ifdef CONFIG_EXT3_FS_XATTR
836 case Opt_user_xattr:
837 set_opt (sbi->s_mount_opt, XATTR_USER);
838 break;
839 case Opt_nouser_xattr:
840 clear_opt (sbi->s_mount_opt, XATTR_USER);
841 break;
842 #else
843 case Opt_user_xattr:
844 case Opt_nouser_xattr:
845 printk("EXT3 (no)user_xattr options not supported\n");
846 break;
847 #endif
848 #ifdef CONFIG_EXT3_FS_POSIX_ACL
849 case Opt_acl:
850 set_opt(sbi->s_mount_opt, POSIX_ACL);
851 break;
852 case Opt_noacl:
853 clear_opt(sbi->s_mount_opt, POSIX_ACL);
854 break;
855 #else
856 case Opt_acl:
857 case Opt_noacl:
858 printk("EXT3 (no)acl options not supported\n");
859 break;
860 #endif
861 case Opt_reservation:
862 set_opt(sbi->s_mount_opt, RESERVATION);
863 break;
864 case Opt_noreservation:
865 clear_opt(sbi->s_mount_opt, RESERVATION);
866 break;
867 case Opt_journal_update:
868 /* @@@ FIXME */
869 /* Eventually we will want to be able to create
870 a journal file here. For now, only allow the
871 user to specify an existing inode to be the
872 journal file. */
873 if (is_remount) {
874 printk(KERN_ERR "EXT3-fs: cannot specify "
875 "journal on remount\n");
876 return 0;
877 }
878 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
879 break;
880 case Opt_journal_inum:
881 if (is_remount) {
882 printk(KERN_ERR "EXT3-fs: cannot specify "
883 "journal on remount\n");
884 return 0;
885 }
886 if (match_int(&args[0], &option))
887 return 0;
888 *inum = option;
889 break;
890 case Opt_journal_dev:
891 if (is_remount) {
892 printk(KERN_ERR "EXT3-fs: cannot specify "
893 "journal on remount\n");
894 return 0;
895 }
896 if (match_int(&args[0], &option))
897 return 0;
898 *journal_devnum = option;
899 break;
900 case Opt_noload:
901 set_opt (sbi->s_mount_opt, NOLOAD);
902 break;
903 case Opt_commit:
904 if (match_int(&args[0], &option))
905 return 0;
906 if (option < 0)
907 return 0;
908 if (option == 0)
909 option = JBD_DEFAULT_MAX_COMMIT_AGE;
910 sbi->s_commit_interval = HZ * option;
911 break;
912 case Opt_data_journal:
913 data_opt = EXT3_MOUNT_JOURNAL_DATA;
914 goto datacheck;
915 case Opt_data_ordered:
916 data_opt = EXT3_MOUNT_ORDERED_DATA;
917 goto datacheck;
918 case Opt_data_writeback:
919 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
920 datacheck:
921 if (is_remount) {
922 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
923 != data_opt) {
924 printk(KERN_ERR
925 "EXT3-fs: cannot change data "
926 "mode on remount\n");
927 return 0;
928 }
929 } else {
930 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
931 sbi->s_mount_opt |= data_opt;
932 }
933 break;
934 #ifdef CONFIG_QUOTA
935 case Opt_usrjquota:
936 qtype = USRQUOTA;
937 goto set_qf_name;
938 case Opt_grpjquota:
939 qtype = GRPQUOTA;
940 set_qf_name:
941 if (sb_any_quota_enabled(sb)) {
942 printk(KERN_ERR
943 "EXT3-fs: Cannot change journalled "
944 "quota options when quota turned on.\n");
945 return 0;
946 }
947 qname = match_strdup(&args[0]);
948 if (!qname) {
949 printk(KERN_ERR
950 "EXT3-fs: not enough memory for "
951 "storing quotafile name.\n");
952 return 0;
953 }
954 if (sbi->s_qf_names[qtype] &&
955 strcmp(sbi->s_qf_names[qtype], qname)) {
956 printk(KERN_ERR
957 "EXT3-fs: %s quota file already "
958 "specified.\n", QTYPE2NAME(qtype));
959 kfree(qname);
960 return 0;
961 }
962 sbi->s_qf_names[qtype] = qname;
963 if (strchr(sbi->s_qf_names[qtype], '/')) {
964 printk(KERN_ERR
965 "EXT3-fs: quotafile must be on "
966 "filesystem root.\n");
967 kfree(sbi->s_qf_names[qtype]);
968 sbi->s_qf_names[qtype] = NULL;
969 return 0;
970 }
971 set_opt(sbi->s_mount_opt, QUOTA);
972 break;
973 case Opt_offusrjquota:
974 qtype = USRQUOTA;
975 goto clear_qf_name;
976 case Opt_offgrpjquota:
977 qtype = GRPQUOTA;
978 clear_qf_name:
979 if (sb_any_quota_enabled(sb)) {
980 printk(KERN_ERR "EXT3-fs: Cannot change "
981 "journalled quota options when "
982 "quota turned on.\n");
983 return 0;
984 }
985 /*
986 * The space will be released later when all options
987 * are confirmed to be correct
988 */
989 sbi->s_qf_names[qtype] = NULL;
990 break;
991 case Opt_jqfmt_vfsold:
992 sbi->s_jquota_fmt = QFMT_VFS_OLD;
993 break;
994 case Opt_jqfmt_vfsv0:
995 sbi->s_jquota_fmt = QFMT_VFS_V0;
996 break;
997 case Opt_quota:
998 case Opt_usrquota:
999 set_opt(sbi->s_mount_opt, QUOTA);
1000 set_opt(sbi->s_mount_opt, USRQUOTA);
1001 break;
1002 case Opt_grpquota:
1003 set_opt(sbi->s_mount_opt, QUOTA);
1004 set_opt(sbi->s_mount_opt, GRPQUOTA);
1005 break;
1006 case Opt_noquota:
1007 if (sb_any_quota_enabled(sb)) {
1008 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1009 "options when quota turned on.\n");
1010 return 0;
1012 clear_opt(sbi->s_mount_opt, QUOTA);
1013 clear_opt(sbi->s_mount_opt, USRQUOTA);
1014 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1015 break;
1016 #else
1017 case Opt_quota:
1018 case Opt_usrquota:
1019 case Opt_grpquota:
1020 case Opt_usrjquota:
1021 case Opt_grpjquota:
1022 case Opt_offusrjquota:
1023 case Opt_offgrpjquota:
1024 case Opt_jqfmt_vfsold:
1025 case Opt_jqfmt_vfsv0:
1026 printk(KERN_ERR
1027 "EXT3-fs: journalled quota options not "
1028 "supported.\n");
1029 break;
1030 case Opt_noquota:
1031 break;
1032 #endif
1033 case Opt_abort:
1034 set_opt(sbi->s_mount_opt, ABORT);
1035 break;
1036 case Opt_barrier:
1037 if (match_int(&args[0], &option))
1038 return 0;
1039 if (option)
1040 set_opt(sbi->s_mount_opt, BARRIER);
1041 else
1042 clear_opt(sbi->s_mount_opt, BARRIER);
1043 break;
1044 case Opt_ignore:
1045 break;
1046 case Opt_resize:
1047 if (!is_remount) {
1048 printk("EXT3-fs: resize option only available "
1049 "for remount\n");
1050 return 0;
1052 if (match_int(&args[0], &option) != 0)
1053 return 0;
1054 *n_blocks_count = option;
1055 break;
1056 case Opt_nobh:
1057 set_opt(sbi->s_mount_opt, NOBH);
1058 break;
1059 case Opt_bh:
1060 clear_opt(sbi->s_mount_opt, NOBH);
1061 break;
1062 default:
1063 printk (KERN_ERR
1064 "EXT3-fs: Unrecognized mount option \"%s\" "
1065 "or missing value\n", p);
1066 return 0;
1069 #ifdef CONFIG_QUOTA
1070 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1071 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1072 sbi->s_qf_names[USRQUOTA])
1073 clear_opt(sbi->s_mount_opt, USRQUOTA);
1075 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1076 sbi->s_qf_names[GRPQUOTA])
1077 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1079 if ((sbi->s_qf_names[USRQUOTA] &&
1080 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1081 (sbi->s_qf_names[GRPQUOTA] &&
1082 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1083 printk(KERN_ERR "EXT3-fs: old and new quota "
1084 "format mixing.\n");
1085 return 0;
1088 if (!sbi->s_jquota_fmt) {
1089 printk(KERN_ERR "EXT3-fs: journalled quota format "
1090 "not specified.\n");
1091 return 0;
1093 } else {
1094 if (sbi->s_jquota_fmt) {
1095 printk(KERN_ERR "EXT3-fs: journalled quota format "
1096 "specified with no journalling "
1097 "enabled.\n");
1098 return 0;
1101 #endif
1102 return 1;
1105 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1106 int read_only)
1108 struct ext3_sb_info *sbi = EXT3_SB(sb);
1109 int res = 0;
1111 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1112 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1113 "forcing read-only mode\n");
1114 res = MS_RDONLY;
1116 if (read_only)
1117 return res;
1118 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1119 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1120 "running e2fsck is recommended\n");
1121 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1122 printk (KERN_WARNING
1123 "EXT3-fs warning: mounting fs with errors, "
1124 "running e2fsck is recommended\n");
1125 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1126 le16_to_cpu(es->s_mnt_count) >=
1127 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1128 printk (KERN_WARNING
1129 "EXT3-fs warning: maximal mount count reached, "
1130 "running e2fsck is recommended\n");
1131 else if (le32_to_cpu(es->s_checkinterval) &&
1132 (le32_to_cpu(es->s_lastcheck) +
1133 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1134 printk (KERN_WARNING
1135 "EXT3-fs warning: checktime reached, "
1136 "running e2fsck is recommended\n");
1137 #if 0
1138 /* @@@ We _will_ want to clear the valid bit if we find
1139 inconsistencies, to force a fsck at reboot. But for
1140 a plain journaled filesystem we can keep it set as
1141 valid forever! :) */
1142 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1143 #endif
1144 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1145 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1146 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1147 es->s_mtime = cpu_to_le32(get_seconds());
1148 ext3_update_dynamic_rev(sb);
1149 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1151 ext3_commit_super(sb, es, 1);
1152 if (test_opt(sb, DEBUG))
1153 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1154 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1155 sb->s_blocksize,
1156 sbi->s_groups_count,
1157 EXT3_BLOCKS_PER_GROUP(sb),
1158 EXT3_INODES_PER_GROUP(sb),
1159 sbi->s_mount_opt);
1161 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1162 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1163 char b[BDEVNAME_SIZE];
1165 printk("external journal on %s\n",
1166 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1167 } else {
1168 printk("internal journal\n");
1170 return res;
1173 /* Called at mount-time, super-block is locked */
1174 static int ext3_check_descriptors (struct super_block * sb)
1176 struct ext3_sb_info *sbi = EXT3_SB(sb);
1177 ext3_fsblk_t block = le32_to_cpu(sbi->s_es->s_first_data_block);
1178 struct ext3_group_desc * gdp = NULL;
1179 int desc_block = 0;
1180 int i;
1182 ext3_debug ("Checking group descriptors");
1184 for (i = 0; i < sbi->s_groups_count; i++)
1186 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1187 gdp = (struct ext3_group_desc *)
1188 sbi->s_group_desc[desc_block++]->b_data;
1189 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1190 le32_to_cpu(gdp->bg_block_bitmap) >=
1191 block + EXT3_BLOCKS_PER_GROUP(sb))
1193 ext3_error (sb, "ext3_check_descriptors",
1194 "Block bitmap for group %d"
1195 " not in group (block %lu)!",
1196 i, (unsigned long)
1197 le32_to_cpu(gdp->bg_block_bitmap));
1198 return 0;
1200 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1201 le32_to_cpu(gdp->bg_inode_bitmap) >=
1202 block + EXT3_BLOCKS_PER_GROUP(sb))
1204 ext3_error (sb, "ext3_check_descriptors",
1205 "Inode bitmap for group %d"
1206 " not in group (block %lu)!",
1207 i, (unsigned long)
1208 le32_to_cpu(gdp->bg_inode_bitmap));
1209 return 0;
1211 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1212 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1213 block + EXT3_BLOCKS_PER_GROUP(sb))
1215 ext3_error (sb, "ext3_check_descriptors",
1216 "Inode table for group %d"
1217 " not in group (block %lu)!",
1218 i, (unsigned long)
1219 le32_to_cpu(gdp->bg_inode_table));
1220 return 0;
1222 block += EXT3_BLOCKS_PER_GROUP(sb);
1223 gdp++;
1226 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1227 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1228 return 1;
1232 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1233 * the superblock) which were deleted from all directories, but held open by
1234 * a process at the time of a crash. We walk the list and try to delete these
1235 * inodes at recovery time (only with a read-write filesystem).
1237 * In order to keep the orphan inode chain consistent during traversal (in
1238 * case of crash during recovery), we link each inode into the superblock
1239 * orphan list_head and handle it the same way as an inode deletion during
1240 * normal operation (which journals the operations for us).
1242 * We only do an iget() and an iput() on each inode, which is very safe if we
1243 * accidentally point at an in-use or already deleted inode. The worst that
1244 * can happen in this case is that we get a "bit already cleared" message from
1245 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1246 * e2fsck was run on this filesystem, and it must have already done the orphan
1247 * inode cleanup for us, so we can safely abort without any further action.
1248 */
1249 static void ext3_orphan_cleanup (struct super_block * sb,
1250 struct ext3_super_block * es)
1252 unsigned int s_flags = sb->s_flags;
1253 int nr_orphans = 0, nr_truncates = 0;
1254 #ifdef CONFIG_QUOTA
1255 int i;
1256 #endif
1257 if (!es->s_last_orphan) {
1258 jbd_debug(4, "no orphan inodes to clean up\n");
1259 return;
1262 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1263 if (es->s_last_orphan)
1264 jbd_debug(1, "Errors on filesystem, "
1265 "clearing orphan list.\n");
1266 es->s_last_orphan = 0;
1267 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1268 return;
1271 if (s_flags & MS_RDONLY) {
1272 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1273 sb->s_id);
1274 sb->s_flags &= ~MS_RDONLY;
1276 #ifdef CONFIG_QUOTA
1277 /* Needed for iput() to work correctly and not trash data */
1278 sb->s_flags |= MS_ACTIVE;
1279 /* Turn on quotas so that they are updated correctly */
1280 for (i = 0; i < MAXQUOTAS; i++) {
1281 if (EXT3_SB(sb)->s_qf_names[i]) {
1282 int ret = ext3_quota_on_mount(sb, i);
1283 if (ret < 0)
1284 printk(KERN_ERR
1285 "EXT3-fs: Cannot turn on journalled "
1286 "quota: error %d\n", ret);
1289 #endif
1291 while (es->s_last_orphan) {
1292 struct inode *inode;
1294 if (!(inode =
1295 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1296 es->s_last_orphan = 0;
1297 break;
1300 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1301 DQUOT_INIT(inode);
1302 if (inode->i_nlink) {
1303 printk(KERN_DEBUG
1304 "%s: truncating inode %ld to %Ld bytes\n",
1305 __FUNCTION__, inode->i_ino, inode->i_size);
1306 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1307 inode->i_ino, inode->i_size);
1308 ext3_truncate(inode);
1309 nr_truncates++;
1310 } else {
1311 printk(KERN_DEBUG
1312 "%s: deleting unreferenced inode %ld\n",
1313 __FUNCTION__, inode->i_ino);
1314 jbd_debug(2, "deleting unreferenced inode %ld\n",
1315 inode->i_ino);
1316 nr_orphans++;
1318 iput(inode); /* The delete magic happens here! */
1321 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1323 if (nr_orphans)
1324 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1325 sb->s_id, PLURAL(nr_orphans));
1326 if (nr_truncates)
1327 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1328 sb->s_id, PLURAL(nr_truncates));
1329 #ifdef CONFIG_QUOTA
1330 /* Turn quotas off */
1331 for (i = 0; i < MAXQUOTAS; i++) {
1332 if (sb_dqopt(sb)->files[i])
1333 vfs_quota_off(sb, i);
1335 #endif
1336 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1339 #define log2(n) ffz(~(n))
1341 /*
1342 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1343 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1344 * We need to be 1 filesystem block less than the 2^32 sector limit.
1345 */
1346 static loff_t ext3_max_size(int bits)
1348 loff_t res = EXT3_NDIR_BLOCKS;
1349 /* This constant is calculated to be the largest file size for a
1350 * dense, 4k-blocksize file such that the total number of
1351 * sectors in the file, including data and all indirect blocks,
1352 * does not exceed 2^32. */
1353 const loff_t upper_limit = 0x1ff7fffd000LL;
1355 res += 1LL << (bits-2);
1356 res += 1LL << (2*(bits-2));
1357 res += 1LL << (3*(bits-2));
1358 res <<= bits;
1359 if (res > upper_limit)
1360 res = upper_limit;
1361 return res;
1364 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1365 ext3_fsblk_t logic_sb_block,
1366 int nr)
1368 struct ext3_sb_info *sbi = EXT3_SB(sb);
1369 unsigned long bg, first_meta_bg;
1370 int has_super = 0;
1372 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1374 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1375 nr < first_meta_bg)
1376 return (logic_sb_block + nr + 1);
1377 bg = sbi->s_desc_per_block * nr;
1378 if (ext3_bg_has_super(sb, bg))
1379 has_super = 1;
1380 return (has_super + ext3_group_first_block_no(sb, bg));
1384 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1386 struct buffer_head * bh;
1387 struct ext3_super_block *es = NULL;
1388 struct ext3_sb_info *sbi;
1389 ext3_fsblk_t block;
1390 ext3_fsblk_t sb_block = get_sb_block(&data);
1391 ext3_fsblk_t logic_sb_block;
1392 unsigned long offset = 0;
1393 unsigned long journal_inum = 0;
1394 unsigned long journal_devnum = 0;
1395 unsigned long def_mount_opts;
1396 struct inode *root;
1397 int blocksize;
1398 int hblock;
1399 int db_count;
1400 int i;
1401 int needs_recovery;
1402 __le32 features;
1404 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1405 if (!sbi)
1406 return -ENOMEM;
1407 sb->s_fs_info = sbi;
1408 memset(sbi, 0, sizeof(*sbi));
1409 sbi->s_mount_opt = 0;
1410 sbi->s_resuid = EXT3_DEF_RESUID;
1411 sbi->s_resgid = EXT3_DEF_RESGID;
1413 unlock_kernel();
1415 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1416 if (!blocksize) {
1417 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1418 goto out_fail;
1421 /*
1422 * The ext3 superblock will not be buffer aligned for other than 1kB
1423 * block sizes. We need to calculate the offset from buffer start.
1424 */
1425 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1426 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1427 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1428 } else {
1429 logic_sb_block = sb_block;
1432 if (!(bh = sb_bread(sb, logic_sb_block))) {
1433 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1434 goto out_fail;
1436 /*
1437 * Note: s_es must be initialized as soon as possible because
1438 * some ext3 macro-instructions depend on its value
1439 */
1440 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1441 sbi->s_es = es;
1442 sb->s_magic = le16_to_cpu(es->s_magic);
1443 if (sb->s_magic != EXT3_SUPER_MAGIC)
1444 goto cantfind_ext3;
1446 /* Set defaults before we parse the mount options */
1447 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1448 if (def_mount_opts & EXT3_DEFM_DEBUG)
1449 set_opt(sbi->s_mount_opt, DEBUG);
1450 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1451 set_opt(sbi->s_mount_opt, GRPID);
1452 if (def_mount_opts & EXT3_DEFM_UID16)
1453 set_opt(sbi->s_mount_opt, NO_UID32);
1454 #ifdef CONFIG_EXT3_FS_XATTR
1455 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1456 set_opt(sbi->s_mount_opt, XATTR_USER);
1457 #endif
1458 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1459 if (def_mount_opts & EXT3_DEFM_ACL)
1460 set_opt(sbi->s_mount_opt, POSIX_ACL);
1461 #endif
1462 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1463 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1464 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1465 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1466 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1467 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1469 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1470 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1471 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1472 set_opt(sbi->s_mount_opt, ERRORS_RO);
1474 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1475 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1477 set_opt(sbi->s_mount_opt, RESERVATION);
1479 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1480 NULL, 0))
1481 goto failed_mount;
1483 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1484 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1486 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1487 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1488 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1489 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1490 printk(KERN_WARNING
1491 "EXT3-fs warning: feature flags set on rev 0 fs, "
1492 "running e2fsck is recommended\n");
1493 /*
1494 * Check feature flags regardless of the revision level, since we
1495 * previously didn't change the revision level when setting the flags,
1496 * so there is a chance incompat flags are set on a rev 0 filesystem.
1497 */
1498 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1499 if (features) {
1500 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1501 "unsupported optional features (%x).\n",
1502 sb->s_id, le32_to_cpu(features));
1503 goto failed_mount;
1505 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1506 if (!(sb->s_flags & MS_RDONLY) && features) {
1507 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1508 "unsupported optional features (%x).\n",
1509 sb->s_id, le32_to_cpu(features));
1510 goto failed_mount;
1512 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1514 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1515 blocksize > EXT3_MAX_BLOCK_SIZE) {
1516 printk(KERN_ERR
1517 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1518 blocksize, sb->s_id);
1519 goto failed_mount;
1522 hblock = bdev_hardsect_size(sb->s_bdev);
1523 if (sb->s_blocksize != blocksize) {
1524 /*
1525 * Make sure the blocksize for the filesystem is larger
1526 * than the hardware sectorsize for the machine.
1527 */
1528 if (blocksize < hblock) {
1529 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1530 "device blocksize %d.\n", blocksize, hblock);
1531 goto failed_mount;
1534 brelse (bh);
1535 sb_set_blocksize(sb, blocksize);
1536 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1537 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1538 bh = sb_bread(sb, logic_sb_block);
1539 if (!bh) {
1540 printk(KERN_ERR
1541 "EXT3-fs: Can't read superblock on 2nd try.\n");
1542 goto failed_mount;
1544 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1545 sbi->s_es = es;
1546 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1547 printk (KERN_ERR
1548 "EXT3-fs: Magic mismatch, very weird !\n");
1549 goto failed_mount;
1553 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1555 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1556 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1557 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1558 } else {
1559 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1560 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1561 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1562 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1563 (sbi->s_inode_size > blocksize)) {
1564 printk (KERN_ERR
1565 "EXT3-fs: unsupported inode size: %d\n",
1566 sbi->s_inode_size);
1567 goto failed_mount;
1570 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1571 le32_to_cpu(es->s_log_frag_size);
1572 if (blocksize != sbi->s_frag_size) {
1573 printk(KERN_ERR
1574 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1575 sbi->s_frag_size, blocksize);
1576 goto failed_mount;
1578 sbi->s_frags_per_block = 1;
1579 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1580 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1581 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1582 if (EXT3_INODE_SIZE(sb) == 0)
1583 goto cantfind_ext3;
1584 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1585 if (sbi->s_inodes_per_block == 0)
1586 goto cantfind_ext3;
1587 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1588 sbi->s_inodes_per_block;
1589 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1590 sbi->s_sbh = bh;
1591 sbi->s_mount_state = le16_to_cpu(es->s_state);
1592 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1593 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1594 for (i=0; i < 4; i++)
1595 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1596 sbi->s_def_hash_version = es->s_def_hash_version;
1598 if (sbi->s_blocks_per_group > blocksize * 8) {
1599 printk (KERN_ERR
1600 "EXT3-fs: #blocks per group too big: %lu\n",
1601 sbi->s_blocks_per_group);
1602 goto failed_mount;
1604 if (sbi->s_frags_per_group > blocksize * 8) {
1605 printk (KERN_ERR
1606 "EXT3-fs: #fragments per group too big: %lu\n",
1607 sbi->s_frags_per_group);
1608 goto failed_mount;
1610 if (sbi->s_inodes_per_group > blocksize * 8) {
1611 printk (KERN_ERR
1612 "EXT3-fs: #inodes per group too big: %lu\n",
1613 sbi->s_inodes_per_group);
1614 goto failed_mount;
1617 if (le32_to_cpu(es->s_blocks_count) >
1618 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1619 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1620 " too large to mount safely\n", sb->s_id);
1621 if (sizeof(sector_t) < 8)
1622 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1623 "enabled\n");
1624 goto failed_mount;
1627 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1628 goto cantfind_ext3;
1629 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1630 le32_to_cpu(es->s_first_data_block) +
1631 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1632 EXT3_BLOCKS_PER_GROUP(sb);
1633 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1634 EXT3_DESC_PER_BLOCK(sb);
1635 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1636 GFP_KERNEL);
1637 if (sbi->s_group_desc == NULL) {
1638 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1639 goto failed_mount;
1642 bgl_lock_init(&sbi->s_blockgroup_lock);
1644 for (i = 0; i < db_count; i++) {
1645 block = descriptor_loc(sb, logic_sb_block, i);
1646 sbi->s_group_desc[i] = sb_bread(sb, block);
1647 if (!sbi->s_group_desc[i]) {
1648 printk (KERN_ERR "EXT3-fs: "
1649 "can't read group descriptor %d\n", i);
1650 db_count = i;
1651 goto failed_mount2;
1654 if (!ext3_check_descriptors (sb)) {
1655 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1656 goto failed_mount2;
1658 sbi->s_gdb_count = db_count;
1659 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1660 spin_lock_init(&sbi->s_next_gen_lock);
1662 percpu_counter_init(&sbi->s_freeblocks_counter,
1663 ext3_count_free_blocks(sb));
1664 percpu_counter_init(&sbi->s_freeinodes_counter,
1665 ext3_count_free_inodes(sb));
1666 percpu_counter_init(&sbi->s_dirs_counter,
1667 ext3_count_dirs(sb));
1669 /* per fileystem reservation list head & lock */
1670 spin_lock_init(&sbi->s_rsv_window_lock);
1671 sbi->s_rsv_window_root = RB_ROOT;
1672 /* Add a single, static dummy reservation to the start of the
1673 * reservation window list --- it gives us a placeholder for
1674 * append-at-start-of-list which makes the allocation logic
1675 * _much_ simpler. */
1676 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1677 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1678 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1679 sbi->s_rsv_window_head.rsv_goal_size = 0;
1680 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1682 /*
1683 * set up enough so that it can read an inode
1684 */
1685 sb->s_op = &ext3_sops;
1686 sb->s_export_op = &ext3_export_ops;
1687 sb->s_xattr = ext3_xattr_handlers;
1688 #ifdef CONFIG_QUOTA
1689 sb->s_qcop = &ext3_qctl_operations;
1690 sb->dq_op = &ext3_quota_operations;
1691 #endif
1692 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1694 sb->s_root = NULL;
1696 needs_recovery = (es->s_last_orphan != 0 ||
1697 EXT3_HAS_INCOMPAT_FEATURE(sb,
1698 EXT3_FEATURE_INCOMPAT_RECOVER));
1700 /*
1701 * The first inode we look at is the journal inode. Don't try
1702 * root first: it may be modified in the journal!
1703 */
1704 if (!test_opt(sb, NOLOAD) &&
1705 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1706 if (ext3_load_journal(sb, es, journal_devnum))
1707 goto failed_mount3;
1708 } else if (journal_inum) {
1709 if (ext3_create_journal(sb, es, journal_inum))
1710 goto failed_mount3;
1711 } else {
1712 if (!silent)
1713 printk (KERN_ERR
1714 "ext3: No journal on filesystem on %s\n",
1715 sb->s_id);
1716 goto failed_mount3;
1719 /* We have now updated the journal if required, so we can
1720 * validate the data journaling mode. */
1721 switch (test_opt(sb, DATA_FLAGS)) {
1722 case 0:
1723 /* No mode set, assume a default based on the journal
1724 capabilities: ORDERED_DATA if the journal can
1725 cope, else JOURNAL_DATA */
1726 if (journal_check_available_features
1727 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1728 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1729 else
1730 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1731 break;
1733 case EXT3_MOUNT_ORDERED_DATA:
1734 case EXT3_MOUNT_WRITEBACK_DATA:
1735 if (!journal_check_available_features
1736 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1737 printk(KERN_ERR "EXT3-fs: Journal does not support "
1738 "requested data journaling mode\n");
1739 goto failed_mount4;
1741 default:
1742 break;
1745 if (test_opt(sb, NOBH)) {
1746 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1747 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1748 "its supported only with writeback mode\n");
1749 clear_opt(sbi->s_mount_opt, NOBH);
1752 /*
1753 * The journal_load will have done any necessary log recovery,
1754 * so we can safely mount the rest of the filesystem now.
1755 */
1757 root = iget(sb, EXT3_ROOT_INO);
1758 sb->s_root = d_alloc_root(root);
1759 if (!sb->s_root) {
1760 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1761 iput(root);
1762 goto failed_mount4;
1764 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1765 dput(sb->s_root);
1766 sb->s_root = NULL;
1767 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1768 goto failed_mount4;
1771 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1772 /*
1773 * akpm: core read_super() calls in here with the superblock locked.
1774 * That deadlocks, because orphan cleanup needs to lock the superblock
1775 * in numerous places. Here we just pop the lock - it's relatively
1776 * harmless, because we are now ready to accept write_super() requests,
1777 * and aviro says that's the only reason for hanging onto the
1778 * superblock lock.
1779 */
1780 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1781 ext3_orphan_cleanup(sb, es);
1782 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1783 if (needs_recovery)
1784 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1785 ext3_mark_recovery_complete(sb, es);
1786 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1787 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1788 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1789 "writeback");
1791 lock_kernel();
1792 return 0;
1794 cantfind_ext3:
1795 if (!silent)
1796 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1797 sb->s_id);
1798 goto failed_mount;
1800 failed_mount4:
1801 journal_destroy(sbi->s_journal);
1802 failed_mount3:
1803 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1804 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1805 percpu_counter_destroy(&sbi->s_dirs_counter);
1806 failed_mount2:
1807 for (i = 0; i < db_count; i++)
1808 brelse(sbi->s_group_desc[i]);
1809 kfree(sbi->s_group_desc);
1810 failed_mount:
1811 #ifdef CONFIG_QUOTA
1812 for (i = 0; i < MAXQUOTAS; i++)
1813 kfree(sbi->s_qf_names[i]);
1814 #endif
1815 ext3_blkdev_remove(sbi);
1816 brelse(bh);
1817 out_fail:
1818 sb->s_fs_info = NULL;
1819 kfree(sbi);
1820 lock_kernel();
1821 return -EINVAL;
1824 /*
1825 * Setup any per-fs journal parameters now. We'll do this both on
1826 * initial mount, once the journal has been initialised but before we've
1827 * done any recovery; and again on any subsequent remount.
1828 */
1829 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1831 struct ext3_sb_info *sbi = EXT3_SB(sb);
1833 if (sbi->s_commit_interval)
1834 journal->j_commit_interval = sbi->s_commit_interval;
1835 /* We could also set up an ext3-specific default for the commit
1836 * interval here, but for now we'll just fall back to the jbd
1837 * default. */
1839 spin_lock(&journal->j_state_lock);
1840 if (test_opt(sb, BARRIER))
1841 journal->j_flags |= JFS_BARRIER;
1842 else
1843 journal->j_flags &= ~JFS_BARRIER;
1844 spin_unlock(&journal->j_state_lock);
1847 static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1849 struct inode *journal_inode;
1850 journal_t *journal;
1852 /* First, test for the existence of a valid inode on disk. Bad
1853 * things happen if we iget() an unused inode, as the subsequent
1854 * iput() will try to delete it. */
1856 journal_inode = iget(sb, journal_inum);
1857 if (!journal_inode) {
1858 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1859 return NULL;
1861 if (!journal_inode->i_nlink) {
1862 make_bad_inode(journal_inode);
1863 iput(journal_inode);
1864 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1865 return NULL;
1868 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1869 journal_inode, journal_inode->i_size);
1870 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1871 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1872 iput(journal_inode);
1873 return NULL;
1876 journal = journal_init_inode(journal_inode);
1877 if (!journal) {
1878 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1879 iput(journal_inode);
1880 return NULL;
1882 journal->j_private = sb;
1883 ext3_init_journal_params(sb, journal);
1884 return journal;
1887 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1888 dev_t j_dev)
1890 struct buffer_head * bh;
1891 journal_t *journal;
1892 ext3_fsblk_t start;
1893 ext3_fsblk_t len;
1894 int hblock, blocksize;
1895 ext3_fsblk_t sb_block;
1896 unsigned long offset;
1897 struct ext3_super_block * es;
1898 struct block_device *bdev;
1900 bdev = ext3_blkdev_get(j_dev);
1901 if (bdev == NULL)
1902 return NULL;
1904 if (bd_claim(bdev, sb)) {
1905 printk(KERN_ERR
1906 "EXT3: failed to claim external journal device.\n");
1907 blkdev_put(bdev);
1908 return NULL;
1911 blocksize = sb->s_blocksize;
1912 hblock = bdev_hardsect_size(bdev);
1913 if (blocksize < hblock) {
1914 printk(KERN_ERR
1915 "EXT3-fs: blocksize too small for journal device.\n");
1916 goto out_bdev;
1919 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1920 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1921 set_blocksize(bdev, blocksize);
1922 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1923 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1924 "external journal\n");
1925 goto out_bdev;
1928 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1929 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1930 !(le32_to_cpu(es->s_feature_incompat) &
1931 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1932 printk(KERN_ERR "EXT3-fs: external journal has "
1933 "bad superblock\n");
1934 brelse(bh);
1935 goto out_bdev;
1938 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1939 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1940 brelse(bh);
1941 goto out_bdev;
1944 len = le32_to_cpu(es->s_blocks_count);
1945 start = sb_block + 1;
1946 brelse(bh); /* we're done with the superblock */
1948 journal = journal_init_dev(bdev, sb->s_bdev,
1949 start, len, blocksize);
1950 if (!journal) {
1951 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1952 goto out_bdev;
1954 journal->j_private = sb;
1955 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1956 wait_on_buffer(journal->j_sb_buffer);
1957 if (!buffer_uptodate(journal->j_sb_buffer)) {
1958 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1959 goto out_journal;
1961 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1962 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1963 "user (unsupported) - %d\n",
1964 be32_to_cpu(journal->j_superblock->s_nr_users));
1965 goto out_journal;
1967 EXT3_SB(sb)->journal_bdev = bdev;
1968 ext3_init_journal_params(sb, journal);
1969 return journal;
1970 out_journal:
1971 journal_destroy(journal);
1972 out_bdev:
1973 ext3_blkdev_put(bdev);
1974 return NULL;
1977 static int ext3_load_journal(struct super_block *sb,
1978 struct ext3_super_block *es,
1979 unsigned long journal_devnum)
1981 journal_t *journal;
1982 int journal_inum = le32_to_cpu(es->s_journal_inum);
1983 dev_t journal_dev;
1984 int err = 0;
1985 int really_read_only;
1987 if (journal_devnum &&
1988 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1989 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
1990 "numbers have changed\n");
1991 journal_dev = new_decode_dev(journal_devnum);
1992 } else
1993 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1995 really_read_only = bdev_read_only(sb->s_bdev);
1997 /*
1998 * Are we loading a blank journal or performing recovery after a
1999 * crash? For recovery, we need to check in advance whether we
2000 * can get read-write access to the device.
2001 */
2003 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2004 if (sb->s_flags & MS_RDONLY) {
2005 printk(KERN_INFO "EXT3-fs: INFO: recovery "
2006 "required on readonly filesystem.\n");
2007 if (really_read_only) {
2008 printk(KERN_ERR "EXT3-fs: write access "
2009 "unavailable, cannot proceed.\n");
2010 return -EROFS;
2012 printk (KERN_INFO "EXT3-fs: write access will "
2013 "be enabled during recovery.\n");
2017 if (journal_inum && journal_dev) {
2018 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2019 "and inode journals!\n");
2020 return -EINVAL;
2023 if (journal_inum) {
2024 if (!(journal = ext3_get_journal(sb, journal_inum)))
2025 return -EINVAL;
2026 } else {
2027 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2028 return -EINVAL;
2031 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2032 err = journal_update_format(journal);
2033 if (err) {
2034 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2035 journal_destroy(journal);
2036 return err;
2040 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2041 err = journal_wipe(journal, !really_read_only);
2042 if (!err)
2043 err = journal_load(journal);
2045 if (err) {
2046 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2047 journal_destroy(journal);
2048 return err;
2051 EXT3_SB(sb)->s_journal = journal;
2052 ext3_clear_journal_err(sb, es);
2054 if (journal_devnum &&
2055 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2056 es->s_journal_dev = cpu_to_le32(journal_devnum);
2057 sb->s_dirt = 1;
2059 /* Make sure we flush the recovery flag to disk. */
2060 ext3_commit_super(sb, es, 1);
2063 return 0;
2066 static int ext3_create_journal(struct super_block * sb,
2067 struct ext3_super_block * es,
2068 int journal_inum)
2070 journal_t *journal;
2072 if (sb->s_flags & MS_RDONLY) {
2073 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2074 "create journal.\n");
2075 return -EROFS;
2078 if (!(journal = ext3_get_journal(sb, journal_inum)))
2079 return -EINVAL;
2081 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
2082 journal_inum);
2084 if (journal_create(journal)) {
2085 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2086 journal_destroy(journal);
2087 return -EIO;
2090 EXT3_SB(sb)->s_journal = journal;
2092 ext3_update_dynamic_rev(sb);
2093 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2094 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2096 es->s_journal_inum = cpu_to_le32(journal_inum);
2097 sb->s_dirt = 1;
2099 /* Make sure we flush the recovery flag to disk. */
2100 ext3_commit_super(sb, es, 1);
2102 return 0;
2105 static void ext3_commit_super (struct super_block * sb,
2106 struct ext3_super_block * es,
2107 int sync)
2109 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2111 if (!sbh)
2112 return;
2113 es->s_wtime = cpu_to_le32(get_seconds());
2114 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2115 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2116 BUFFER_TRACE(sbh, "marking dirty");
2117 mark_buffer_dirty(sbh);
2118 if (sync)
2119 sync_dirty_buffer(sbh);
2123 /*
2124 * Have we just finished recovery? If so, and if we are mounting (or
2125 * remounting) the filesystem readonly, then we will end up with a
2126 * consistent fs on disk. Record that fact.
2127 */
2128 static void ext3_mark_recovery_complete(struct super_block * sb,
2129 struct ext3_super_block * es)
2131 journal_t *journal = EXT3_SB(sb)->s_journal;
2133 journal_lock_updates(journal);
2134 journal_flush(journal);
2135 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2136 sb->s_flags & MS_RDONLY) {
2137 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2138 sb->s_dirt = 0;
2139 ext3_commit_super(sb, es, 1);
2141 journal_unlock_updates(journal);
2144 /*
2145 * If we are mounting (or read-write remounting) a filesystem whose journal
2146 * has recorded an error from a previous lifetime, move that error to the
2147 * main filesystem now.
2148 */
2149 static void ext3_clear_journal_err(struct super_block * sb,
2150 struct ext3_super_block * es)
2152 journal_t *journal;
2153 int j_errno;
2154 const char *errstr;
2156 journal = EXT3_SB(sb)->s_journal;
2158 /*
2159 * Now check for any error status which may have been recorded in the
2160 * journal by a prior ext3_error() or ext3_abort()
2161 */
2163 j_errno = journal_errno(journal);
2164 if (j_errno) {
2165 char nbuf[16];
2167 errstr = ext3_decode_error(sb, j_errno, nbuf);
2168 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2169 "from previous mount: %s", errstr);
2170 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2171 "filesystem check.");
2173 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2174 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2175 ext3_commit_super (sb, es, 1);
2177 journal_clear_err(journal);
2181 /*
2182 * Force the running and committing transactions to commit,
2183 * and wait on the commit.
2184 */
2185 int ext3_force_commit(struct super_block *sb)
2187 journal_t *journal;
2188 int ret;
2190 if (sb->s_flags & MS_RDONLY)
2191 return 0;
2193 journal = EXT3_SB(sb)->s_journal;
2194 sb->s_dirt = 0;
2195 ret = ext3_journal_force_commit(journal);
2196 return ret;
2199 /*
2200 * Ext3 always journals updates to the superblock itself, so we don't
2201 * have to propagate any other updates to the superblock on disk at this
2202 * point. Just start an async writeback to get the buffers on their way
2203 * to the disk.
2205 * This implicitly triggers the writebehind on sync().
2206 */
2208 static void ext3_write_super (struct super_block * sb)
2210 if (mutex_trylock(&sb->s_lock) != 0)
2211 BUG();
2212 sb->s_dirt = 0;
2215 static int ext3_sync_fs(struct super_block *sb, int wait)
2217 tid_t target;
2219 sb->s_dirt = 0;
2220 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2221 if (wait)
2222 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2224 return 0;
2227 /*
2228 * LVM calls this function before a (read-only) snapshot is created. This
2229 * gives us a chance to flush the journal completely and mark the fs clean.
2230 */
2231 static void ext3_write_super_lockfs(struct super_block *sb)
2233 sb->s_dirt = 0;
2235 if (!(sb->s_flags & MS_RDONLY)) {
2236 journal_t *journal = EXT3_SB(sb)->s_journal;
2238 /* Now we set up the journal barrier. */
2239 journal_lock_updates(journal);
2240 journal_flush(journal);
2242 /* Journal blocked and flushed, clear needs_recovery flag. */
2243 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2244 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2248 /*
2249 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2250 * flag here, even though the filesystem is not technically dirty yet.
2251 */
2252 static void ext3_unlockfs(struct super_block *sb)
2254 if (!(sb->s_flags & MS_RDONLY)) {
2255 lock_super(sb);
2256 /* Reser the needs_recovery flag before the fs is unlocked. */
2257 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2258 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2259 unlock_super(sb);
2260 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2264 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2266 struct ext3_super_block * es;
2267 struct ext3_sb_info *sbi = EXT3_SB(sb);
2268 ext3_fsblk_t n_blocks_count = 0;
2269 unsigned long old_sb_flags;
2270 struct ext3_mount_options old_opts;
2271 int err;
2272 #ifdef CONFIG_QUOTA
2273 int i;
2274 #endif
2276 /* Store the original options */
2277 old_sb_flags = sb->s_flags;
2278 old_opts.s_mount_opt = sbi->s_mount_opt;
2279 old_opts.s_resuid = sbi->s_resuid;
2280 old_opts.s_resgid = sbi->s_resgid;
2281 old_opts.s_commit_interval = sbi->s_commit_interval;
2282 #ifdef CONFIG_QUOTA
2283 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2284 for (i = 0; i < MAXQUOTAS; i++)
2285 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2286 #endif
2288 /*
2289 * Allow the "check" option to be passed as a remount option.
2290 */
2291 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2292 err = -EINVAL;
2293 goto restore_opts;
2296 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2297 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2299 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2300 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2302 es = sbi->s_es;
2304 ext3_init_journal_params(sb, sbi->s_journal);
2306 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2307 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2308 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2309 err = -EROFS;
2310 goto restore_opts;
2313 if (*flags & MS_RDONLY) {
2314 /*
2315 * First of all, the unconditional stuff we have to do
2316 * to disable replay of the journal when we next remount
2317 */
2318 sb->s_flags |= MS_RDONLY;
2320 /*
2321 * OK, test if we are remounting a valid rw partition
2322 * readonly, and if so set the rdonly flag and then
2323 * mark the partition as valid again.
2324 */
2325 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2326 (sbi->s_mount_state & EXT3_VALID_FS))
2327 es->s_state = cpu_to_le16(sbi->s_mount_state);
2329 ext3_mark_recovery_complete(sb, es);
2330 } else {
2331 __le32 ret;
2332 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2333 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2334 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2335 "remount RDWR because of unsupported "
2336 "optional features (%x).\n",
2337 sb->s_id, le32_to_cpu(ret));
2338 err = -EROFS;
2339 goto restore_opts;
2341 /*
2342 * Mounting a RDONLY partition read-write, so reread
2343 * and store the current valid flag. (It may have
2344 * been changed by e2fsck since we originally mounted
2345 * the partition.)
2346 */
2347 ext3_clear_journal_err(sb, es);
2348 sbi->s_mount_state = le16_to_cpu(es->s_state);
2349 if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2350 err = ret;
2351 goto restore_opts;
2353 if (!ext3_setup_super (sb, es, 0))
2354 sb->s_flags &= ~MS_RDONLY;
2357 #ifdef CONFIG_QUOTA
2358 /* Release old quota file names */
2359 for (i = 0; i < MAXQUOTAS; i++)
2360 if (old_opts.s_qf_names[i] &&
2361 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2362 kfree(old_opts.s_qf_names[i]);
2363 #endif
2364 return 0;
2365 restore_opts:
2366 sb->s_flags = old_sb_flags;
2367 sbi->s_mount_opt = old_opts.s_mount_opt;
2368 sbi->s_resuid = old_opts.s_resuid;
2369 sbi->s_resgid = old_opts.s_resgid;
2370 sbi->s_commit_interval = old_opts.s_commit_interval;
2371 #ifdef CONFIG_QUOTA
2372 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2373 for (i = 0; i < MAXQUOTAS; i++) {
2374 if (sbi->s_qf_names[i] &&
2375 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2376 kfree(sbi->s_qf_names[i]);
2377 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2379 #endif
2380 return err;
2383 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2385 struct super_block *sb = dentry->d_sb;
2386 struct ext3_sb_info *sbi = EXT3_SB(sb);
2387 struct ext3_super_block *es = sbi->s_es;
2388 ext3_fsblk_t overhead;
2389 int i;
2391 if (test_opt (sb, MINIX_DF))
2392 overhead = 0;
2393 else {
2394 unsigned long ngroups;
2395 ngroups = EXT3_SB(sb)->s_groups_count;
2396 smp_rmb();
2398 /*
2399 * Compute the overhead (FS structures)
2400 */
2402 /*
2403 * All of the blocks before first_data_block are
2404 * overhead
2405 */
2406 overhead = le32_to_cpu(es->s_first_data_block);
2408 /*
2409 * Add the overhead attributed to the superblock and
2410 * block group descriptors. If the sparse superblocks
2411 * feature is turned on, then not all groups have this.
2412 */
2413 for (i = 0; i < ngroups; i++) {
2414 overhead += ext3_bg_has_super(sb, i) +
2415 ext3_bg_num_gdb(sb, i);
2416 cond_resched();
2419 /*
2420 * Every block group has an inode bitmap, a block
2421 * bitmap, and an inode table.
2422 */
2423 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2426 buf->f_type = EXT3_SUPER_MAGIC;
2427 buf->f_bsize = sb->s_blocksize;
2428 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2429 buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
2430 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2431 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2432 buf->f_bavail = 0;
2433 buf->f_files = le32_to_cpu(es->s_inodes_count);
2434 buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
2435 buf->f_namelen = EXT3_NAME_LEN;
2436 return 0;
2439 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2440 * is locked for write. Otherwise the are possible deadlocks:
2441 * Process 1 Process 2
2442 * ext3_create() quota_sync()
2443 * journal_start() write_dquot()
2444 * DQUOT_INIT() down(dqio_mutex)
2445 * down(dqio_mutex) journal_start()
2447 */
2449 #ifdef CONFIG_QUOTA
2451 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2453 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2456 static int ext3_dquot_initialize(struct inode *inode, int type)
2458 handle_t *handle;
2459 int ret, err;
2461 /* We may create quota structure so we need to reserve enough blocks */
2462 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2463 if (IS_ERR(handle))
2464 return PTR_ERR(handle);
2465 ret = dquot_initialize(inode, type);
2466 err = ext3_journal_stop(handle);
2467 if (!ret)
2468 ret = err;
2469 return ret;
2472 static int ext3_dquot_drop(struct inode *inode)
2474 handle_t *handle;
2475 int ret, err;
2477 /* We may delete quota structure so we need to reserve enough blocks */
2478 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2479 if (IS_ERR(handle))
2480 return PTR_ERR(handle);
2481 ret = dquot_drop(inode);
2482 err = ext3_journal_stop(handle);
2483 if (!ret)
2484 ret = err;
2485 return ret;
2488 static int ext3_write_dquot(struct dquot *dquot)
2490 int ret, err;
2491 handle_t *handle;
2492 struct inode *inode;
2494 inode = dquot_to_inode(dquot);
2495 handle = ext3_journal_start(inode,
2496 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2497 if (IS_ERR(handle))
2498 return PTR_ERR(handle);
2499 ret = dquot_commit(dquot);
2500 err = ext3_journal_stop(handle);
2501 if (!ret)
2502 ret = err;
2503 return ret;
2506 static int ext3_acquire_dquot(struct dquot *dquot)
2508 int ret, err;
2509 handle_t *handle;
2511 handle = ext3_journal_start(dquot_to_inode(dquot),
2512 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2513 if (IS_ERR(handle))
2514 return PTR_ERR(handle);
2515 ret = dquot_acquire(dquot);
2516 err = ext3_journal_stop(handle);
2517 if (!ret)
2518 ret = err;
2519 return ret;
2522 static int ext3_release_dquot(struct dquot *dquot)
2524 int ret, err;
2525 handle_t *handle;
2527 handle = ext3_journal_start(dquot_to_inode(dquot),
2528 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2529 if (IS_ERR(handle))
2530 return PTR_ERR(handle);
2531 ret = dquot_release(dquot);
2532 err = ext3_journal_stop(handle);
2533 if (!ret)
2534 ret = err;
2535 return ret;
2538 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2540 /* Are we journalling quotas? */
2541 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2542 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2543 dquot_mark_dquot_dirty(dquot);
2544 return ext3_write_dquot(dquot);
2545 } else {
2546 return dquot_mark_dquot_dirty(dquot);
2550 static int ext3_write_info(struct super_block *sb, int type)
2552 int ret, err;
2553 handle_t *handle;
2555 /* Data block + inode block */
2556 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2557 if (IS_ERR(handle))
2558 return PTR_ERR(handle);
2559 ret = dquot_commit_info(sb, type);
2560 err = ext3_journal_stop(handle);
2561 if (!ret)
2562 ret = err;
2563 return ret;
2566 /*
2567 * Turn on quotas during mount time - we need to find
2568 * the quota file and such...
2569 */
2570 static int ext3_quota_on_mount(struct super_block *sb, int type)
2572 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2573 EXT3_SB(sb)->s_jquota_fmt, type);
2576 /*
2577 * Standard function to be called on quota_on
2578 */
2579 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2580 char *path)
2582 int err;
2583 struct nameidata nd;
2585 if (!test_opt(sb, QUOTA))
2586 return -EINVAL;
2587 /* Not journalling quota? */
2588 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2589 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2590 return vfs_quota_on(sb, type, format_id, path);
2591 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2592 if (err)
2593 return err;
2594 /* Quotafile not on the same filesystem? */
2595 if (nd.mnt->mnt_sb != sb) {
2596 path_release(&nd);
2597 return -EXDEV;
2599 /* Quotafile not of fs root? */
2600 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2601 printk(KERN_WARNING
2602 "EXT3-fs: Quota file not on filesystem root. "
2603 "Journalled quota will not work.\n");
2604 path_release(&nd);
2605 return vfs_quota_on(sb, type, format_id, path);
2608 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2609 * acquiring the locks... As quota files are never truncated and quota code
2610 * itself serializes the operations (and noone else should touch the files)
2611 * we don't have to be afraid of races */
2612 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2613 size_t len, loff_t off)
2615 struct inode *inode = sb_dqopt(sb)->files[type];
2616 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2617 int err = 0;
2618 int offset = off & (sb->s_blocksize - 1);
2619 int tocopy;
2620 size_t toread;
2621 struct buffer_head *bh;
2622 loff_t i_size = i_size_read(inode);
2624 if (off > i_size)
2625 return 0;
2626 if (off+len > i_size)
2627 len = i_size-off;
2628 toread = len;
2629 while (toread > 0) {
2630 tocopy = sb->s_blocksize - offset < toread ?
2631 sb->s_blocksize - offset : toread;
2632 bh = ext3_bread(NULL, inode, blk, 0, &err);
2633 if (err)
2634 return err;
2635 if (!bh) /* A hole? */
2636 memset(data, 0, tocopy);
2637 else
2638 memcpy(data, bh->b_data+offset, tocopy);
2639 brelse(bh);
2640 offset = 0;
2641 toread -= tocopy;
2642 data += tocopy;
2643 blk++;
2645 return len;
2648 /* Write to quotafile (we know the transaction is already started and has
2649 * enough credits) */
2650 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2651 const char *data, size_t len, loff_t off)
2653 struct inode *inode = sb_dqopt(sb)->files[type];
2654 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2655 int err = 0;
2656 int offset = off & (sb->s_blocksize - 1);
2657 int tocopy;
2658 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2659 size_t towrite = len;
2660 struct buffer_head *bh;
2661 handle_t *handle = journal_current_handle();
2663 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2664 while (towrite > 0) {
2665 tocopy = sb->s_blocksize - offset < towrite ?
2666 sb->s_blocksize - offset : towrite;
2667 bh = ext3_bread(handle, inode, blk, 1, &err);
2668 if (!bh)
2669 goto out;
2670 if (journal_quota) {
2671 err = ext3_journal_get_write_access(handle, bh);
2672 if (err) {
2673 brelse(bh);
2674 goto out;
2677 lock_buffer(bh);
2678 memcpy(bh->b_data+offset, data, tocopy);
2679 flush_dcache_page(bh->b_page);
2680 unlock_buffer(bh);
2681 if (journal_quota)
2682 err = ext3_journal_dirty_metadata(handle, bh);
2683 else {
2684 /* Always do at least ordered writes for quotas */
2685 err = ext3_journal_dirty_data(handle, bh);
2686 mark_buffer_dirty(bh);
2688 brelse(bh);
2689 if (err)
2690 goto out;
2691 offset = 0;
2692 towrite -= tocopy;
2693 data += tocopy;
2694 blk++;
2696 out:
2697 if (len == towrite)
2698 return err;
2699 if (inode->i_size < off+len-towrite) {
2700 i_size_write(inode, off+len-towrite);
2701 EXT3_I(inode)->i_disksize = inode->i_size;
2703 inode->i_version++;
2704 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2705 ext3_mark_inode_dirty(handle, inode);
2706 mutex_unlock(&inode->i_mutex);
2707 return len - towrite;
2710 #endif
2712 static int ext3_get_sb(struct file_system_type *fs_type,
2713 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2715 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2718 static struct file_system_type ext3_fs_type = {
2719 .owner = THIS_MODULE,
2720 .name = "ext3",
2721 .get_sb = ext3_get_sb,
2722 .kill_sb = kill_block_super,
2723 .fs_flags = FS_REQUIRES_DEV,
2724 };
2726 static int __init init_ext3_fs(void)
2728 int err = init_ext3_xattr();
2729 if (err)
2730 return err;
2731 err = init_inodecache();
2732 if (err)
2733 goto out1;
2734 err = register_filesystem(&ext3_fs_type);
2735 if (err)
2736 goto out;
2737 return 0;
2738 out:
2739 destroy_inodecache();
2740 out1:
2741 exit_ext3_xattr();
2742 return err;
2745 static void __exit exit_ext3_fs(void)
2747 unregister_filesystem(&ext3_fs_type);
2748 destroy_inodecache();
2749 exit_ext3_xattr();
2752 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2753 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2754 MODULE_LICENSE("GPL");
2755 module_init(init_ext3_fs)
2756 module_exit(exit_ext3_fs)