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[PATCH] ext3: inode numbers are unsigned long
[linux-2.6/mini2440.git] / fs / ext3 / super.c
blobbc7a768f9bb42e8265deb9789efc155a75786e89
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 */
18
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>
38
39 #include <asm/uaccess.h>
40
41 #include "xattr.h"
42 #include "acl.h"
43 #include "namei.h"
44
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 unsigned 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);
64
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;
76
77 if (sb->s_flags & MS_RDONLY)
78 return ERR_PTR(-EROFS);
79
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 }
89
90 return journal_start(journal, nblocks);
91 }
92
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;
104
105 sb = handle->h_transaction->t_journal->j_private;
106 err = handle->h_err;
107 rc = journal_stop(handle);
108
109 if (!err)
110 err = rc;
111 if (err)
112 __ext3_std_error(sb, where, err);
113 return err;
114 }
115
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);
121
122 if (bh)
123 BUFFER_TRACE(bh, "abort");
124
125 if (!handle->h_err)
126 handle->h_err = err;
127
128 if (is_handle_aborted(handle))
129 return;
130
131 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
132 caller, errstr, err_fn);
133
134 journal_abort_handle(handle);
135 }
136
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 */
151
152 static void ext3_handle_error(struct super_block *sb)
153 {
154 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
155
156 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
157 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
158
159 if (sb->s_flags & MS_RDONLY)
160 return;
161
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;
167
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 }
177
178 void ext3_error (struct super_block * sb, const char * function,
179 const char * fmt, ...)
180 {
181 va_list args;
182
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);
188
189 ext3_handle_error(sb);
190 }
191
192 static const char *ext3_decode_error(struct super_block * sb, int errno,
193 char nbuf[16])
194 {
195 char *errstr = NULL;
196
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 }
221
222 return errstr;
223 }
224
225 /* __ext3_std_error decodes expected errors from journaling functions
226 * automatically and invokes the appropriate error response. */
227
228 void __ext3_std_error (struct super_block * sb, const char * function,
229 int errno)
230 {
231 char nbuf[16];
232 const char *errstr;
233
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;
240
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);
244
245 ext3_handle_error(sb);
246 }
247
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 */
257
258 void ext3_abort (struct super_block * sb, const char * function,
259 const char * fmt, ...)
260 {
261 va_list args;
262
263 printk (KERN_CRIT "ext3_abort called.\n");
264
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);
270
271 if (test_opt(sb, ERRORS_PANIC))
272 panic("EXT3-fs panic from previous error\n");
273
274 if (sb->s_flags & MS_RDONLY)
275 return;
276
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 }
283
284 void ext3_warning (struct super_block * sb, const char * function,
285 const char * fmt, ...)
286 {
287 va_list args;
288
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 }
296
297 void ext3_update_dynamic_rev(struct super_block *sb)
298 {
299 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
300
301 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
302 return;
303
304 ext3_warning(sb, __FUNCTION__,
305 "updating to rev %d because of new feature flag, "
306 "running e2fsck is recommended",
307 EXT3_DYNAMIC_REV);
308
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 */
314
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 }
321
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];
329
330 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
331 if (IS_ERR(bdev))
332 goto fail;
333 return bdev;
334
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 }
340
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 }
349
350 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
351 {
352 struct block_device *bdev;
353 int ret = -ENODEV;
354
355 bdev = sbi->journal_bdev;
356 if (bdev) {
357 ret = ext3_blkdev_put(bdev);
358 sbi->journal_bdev = NULL;
359 }
360 return ret;
361 }
362
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 }
367
368 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
369 {
370 struct list_head *l;
371
372 printk(KERN_ERR "sb orphan head is %d\n",
373 le32_to_cpu(sbi->s_es->s_last_orphan));
374
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:%lu 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 }
385
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;
391
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 }
401
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
413
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));
421
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 }
437
438 static kmem_cache_t *ext3_inode_cachep;
439
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;
446
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 }
458
459 static void ext3_destroy_inode(struct inode *inode)
460 {
461 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
462 }
463
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;
467
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 }
478
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 }
490
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 }
496
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 }
517
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);
522
523 if (sbi->s_jquota_fmt)
524 seq_printf(seq, ",jqfmt=%s",
525 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
526
527 if (sbi->s_qf_names[USRQUOTA])
528 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
529
530 if (sbi->s_qf_names[GRPQUOTA])
531 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
532
533 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
534 seq_puts(seq, ",usrquota");
535
536 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
537 seq_puts(seq, ",grpquota");
538 #endif
539 }
540
541 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
542 {
543 struct super_block *sb = vfs->mnt_sb;
544
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");
551
552 ext3_show_quota_options(seq, sb);
553
554 return 0;
555 }
556
557
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;
565
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);
570
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 }
597
598 #ifdef CONFIG_QUOTA
599 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
600 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
601
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);
615
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 };
630
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
641
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 };
663
664 static struct export_operations ext3_export_ops = {
665 .get_parent = ext3_get_parent,
666 .get_dentry = ext3_get_dentry,
667 };
668
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 };
682
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 };
733
734 static ext3_fsblk_t get_sb_block(void **data)
735 {
736 ext3_fsblk_t sb_block;
737 char *options = (char *) *data;
738
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 }
754
755 static int parse_options (char *options, struct super_block *sb,
756 unsigned int *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
768
769 if (!options)
770 return 1;
771
772 while ((p = strsep (&options, ",")) != NULL) {
773 int token;
774 if (!*p)
775 continue;
776
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;
1011 }
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;
1051 }
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;
1067 }
1068 }
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);
1074
1075 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1076 sbi->s_qf_names[GRPQUOTA])
1077 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1078
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;
1086 }
1087
1088 if (!sbi->s_jquota_fmt) {
1089 printk(KERN_ERR "EXT3-fs: journalled quota format "
1090 "not specified.\n");
1091 return 0;
1092 }
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;
1099 }
1100 }
1101 #endif
1102 return 1;
1103 }
1104
1105 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1106 int read_only)
1107 {
1108 struct ext3_sb_info *sbi = EXT3_SB(sb);
1109 int res = 0;
1110
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;
1115 }
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);
1150
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);
1160
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];
1164
1165 printk("external journal on %s\n",
1166 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1167 } else {
1168 printk("internal journal\n");
1169 }
1170 return res;
1171 }
1172
1173 /* Called at mount-time, super-block is locked */
1174 static int ext3_check_descriptors (struct super_block * sb)
1175 {
1176 struct ext3_sb_info *sbi = EXT3_SB(sb);
1177 ext3_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1178 ext3_fsblk_t last_block;
1179 struct ext3_group_desc * gdp = NULL;
1180 int desc_block = 0;
1181 int i;
1182
1183 ext3_debug ("Checking group descriptors");
1184
1185 for (i = 0; i < sbi->s_groups_count; i++)
1186 {
1187 if (i == sbi->s_groups_count - 1)
1188 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1189 else
1190 last_block = first_block +
1191 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1192
1193 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1194 gdp = (struct ext3_group_desc *)
1195 sbi->s_group_desc[desc_block++]->b_data;
1196 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1197 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1198 {
1199 ext3_error (sb, "ext3_check_descriptors",
1200 "Block bitmap for group %d"
1201 " not in group (block %lu)!",
1202 i, (unsigned long)
1203 le32_to_cpu(gdp->bg_block_bitmap));
1204 return 0;
1205 }
1206 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1207 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1208 {
1209 ext3_error (sb, "ext3_check_descriptors",
1210 "Inode bitmap for group %d"
1211 " not in group (block %lu)!",
1212 i, (unsigned long)
1213 le32_to_cpu(gdp->bg_inode_bitmap));
1214 return 0;
1215 }
1216 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1217 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >
1218 last_block)
1219 {
1220 ext3_error (sb, "ext3_check_descriptors",
1221 "Inode table for group %d"
1222 " not in group (block %lu)!",
1223 i, (unsigned long)
1224 le32_to_cpu(gdp->bg_inode_table));
1225 return 0;
1226 }
1227 first_block += EXT3_BLOCKS_PER_GROUP(sb);
1228 gdp++;
1229 }
1230
1231 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1232 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1233 return 1;
1234 }
1235
1236
1237 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1238 * the superblock) which were deleted from all directories, but held open by
1239 * a process at the time of a crash. We walk the list and try to delete these
1240 * inodes at recovery time (only with a read-write filesystem).
1241 *
1242 * In order to keep the orphan inode chain consistent during traversal (in
1243 * case of crash during recovery), we link each inode into the superblock
1244 * orphan list_head and handle it the same way as an inode deletion during
1245 * normal operation (which journals the operations for us).
1246 *
1247 * We only do an iget() and an iput() on each inode, which is very safe if we
1248 * accidentally point at an in-use or already deleted inode. The worst that
1249 * can happen in this case is that we get a "bit already cleared" message from
1250 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1251 * e2fsck was run on this filesystem, and it must have already done the orphan
1252 * inode cleanup for us, so we can safely abort without any further action.
1253 */
1254 static void ext3_orphan_cleanup (struct super_block * sb,
1255 struct ext3_super_block * es)
1256 {
1257 unsigned int s_flags = sb->s_flags;
1258 int nr_orphans = 0, nr_truncates = 0;
1259 #ifdef CONFIG_QUOTA
1260 int i;
1261 #endif
1262 if (!es->s_last_orphan) {
1263 jbd_debug(4, "no orphan inodes to clean up\n");
1264 return;
1265 }
1266
1267 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1268 if (es->s_last_orphan)
1269 jbd_debug(1, "Errors on filesystem, "
1270 "clearing orphan list.\n");
1271 es->s_last_orphan = 0;
1272 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1273 return;
1274 }
1275
1276 if (s_flags & MS_RDONLY) {
1277 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1278 sb->s_id);
1279 sb->s_flags &= ~MS_RDONLY;
1280 }
1281 #ifdef CONFIG_QUOTA
1282 /* Needed for iput() to work correctly and not trash data */
1283 sb->s_flags |= MS_ACTIVE;
1284 /* Turn on quotas so that they are updated correctly */
1285 for (i = 0; i < MAXQUOTAS; i++) {
1286 if (EXT3_SB(sb)->s_qf_names[i]) {
1287 int ret = ext3_quota_on_mount(sb, i);
1288 if (ret < 0)
1289 printk(KERN_ERR
1290 "EXT3-fs: Cannot turn on journalled "
1291 "quota: error %d\n", ret);
1292 }
1293 }
1294 #endif
1295
1296 while (es->s_last_orphan) {
1297 struct inode *inode;
1298
1299 if (!(inode =
1300 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1301 es->s_last_orphan = 0;
1302 break;
1303 }
1304
1305 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1306 DQUOT_INIT(inode);
1307 if (inode->i_nlink) {
1308 printk(KERN_DEBUG
1309 "%s: truncating inode %lu to %Ld bytes\n",
1310 __FUNCTION__, inode->i_ino, inode->i_size);
1311 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1312 inode->i_ino, inode->i_size);
1313 ext3_truncate(inode);
1314 nr_truncates++;
1315 } else {
1316 printk(KERN_DEBUG
1317 "%s: deleting unreferenced inode %lu\n",
1318 __FUNCTION__, inode->i_ino);
1319 jbd_debug(2, "deleting unreferenced inode %lu\n",
1320 inode->i_ino);
1321 nr_orphans++;
1322 }
1323 iput(inode); /* The delete magic happens here! */
1324 }
1325
1326 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1327
1328 if (nr_orphans)
1329 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1330 sb->s_id, PLURAL(nr_orphans));
1331 if (nr_truncates)
1332 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1333 sb->s_id, PLURAL(nr_truncates));
1334 #ifdef CONFIG_QUOTA
1335 /* Turn quotas off */
1336 for (i = 0; i < MAXQUOTAS; i++) {
1337 if (sb_dqopt(sb)->files[i])
1338 vfs_quota_off(sb, i);
1339 }
1340 #endif
1341 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1342 }
1343
1344 #define log2(n) ffz(~(n))
1345
1346 /*
1347 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1348 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1349 * We need to be 1 filesystem block less than the 2^32 sector limit.
1350 */
1351 static loff_t ext3_max_size(int bits)
1352 {
1353 loff_t res = EXT3_NDIR_BLOCKS;
1354 /* This constant is calculated to be the largest file size for a
1355 * dense, 4k-blocksize file such that the total number of
1356 * sectors in the file, including data and all indirect blocks,
1357 * does not exceed 2^32. */
1358 const loff_t upper_limit = 0x1ff7fffd000LL;
1359
1360 res += 1LL << (bits-2);
1361 res += 1LL << (2*(bits-2));
1362 res += 1LL << (3*(bits-2));
1363 res <<= bits;
1364 if (res > upper_limit)
1365 res = upper_limit;
1366 return res;
1367 }
1368
1369 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1370 ext3_fsblk_t logic_sb_block,
1371 int nr)
1372 {
1373 struct ext3_sb_info *sbi = EXT3_SB(sb);
1374 unsigned long bg, first_meta_bg;
1375 int has_super = 0;
1376
1377 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1378
1379 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1380 nr < first_meta_bg)
1381 return (logic_sb_block + nr + 1);
1382 bg = sbi->s_desc_per_block * nr;
1383 if (ext3_bg_has_super(sb, bg))
1384 has_super = 1;
1385 return (has_super + ext3_group_first_block_no(sb, bg));
1386 }
1387
1388
1389 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1390 {
1391 struct buffer_head * bh;
1392 struct ext3_super_block *es = NULL;
1393 struct ext3_sb_info *sbi;
1394 ext3_fsblk_t block;
1395 ext3_fsblk_t sb_block = get_sb_block(&data);
1396 ext3_fsblk_t logic_sb_block;
1397 unsigned long offset = 0;
1398 unsigned int journal_inum = 0;
1399 unsigned long journal_devnum = 0;
1400 unsigned long def_mount_opts;
1401 struct inode *root;
1402 int blocksize;
1403 int hblock;
1404 int db_count;
1405 int i;
1406 int needs_recovery;
1407 __le32 features;
1408
1409 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1410 if (!sbi)
1411 return -ENOMEM;
1412 sb->s_fs_info = sbi;
1413 memset(sbi, 0, sizeof(*sbi));
1414 sbi->s_mount_opt = 0;
1415 sbi->s_resuid = EXT3_DEF_RESUID;
1416 sbi->s_resgid = EXT3_DEF_RESGID;
1417
1418 unlock_kernel();
1419
1420 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1421 if (!blocksize) {
1422 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1423 goto out_fail;
1424 }
1425
1426 /*
1427 * The ext3 superblock will not be buffer aligned for other than 1kB
1428 * block sizes. We need to calculate the offset from buffer start.
1429 */
1430 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1431 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1432 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1433 } else {
1434 logic_sb_block = sb_block;
1435 }
1436
1437 if (!(bh = sb_bread(sb, logic_sb_block))) {
1438 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1439 goto out_fail;
1440 }
1441 /*
1442 * Note: s_es must be initialized as soon as possible because
1443 * some ext3 macro-instructions depend on its value
1444 */
1445 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1446 sbi->s_es = es;
1447 sb->s_magic = le16_to_cpu(es->s_magic);
1448 if (sb->s_magic != EXT3_SUPER_MAGIC)
1449 goto cantfind_ext3;
1450
1451 /* Set defaults before we parse the mount options */
1452 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1453 if (def_mount_opts & EXT3_DEFM_DEBUG)
1454 set_opt(sbi->s_mount_opt, DEBUG);
1455 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1456 set_opt(sbi->s_mount_opt, GRPID);
1457 if (def_mount_opts & EXT3_DEFM_UID16)
1458 set_opt(sbi->s_mount_opt, NO_UID32);
1459 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1460 set_opt(sbi->s_mount_opt, XATTR_USER);
1461 if (def_mount_opts & EXT3_DEFM_ACL)
1462 set_opt(sbi->s_mount_opt, POSIX_ACL);
1463 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1464 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1465 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1466 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1467 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1468 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1469
1470 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1471 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1472 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1473 set_opt(sbi->s_mount_opt, ERRORS_RO);
1474
1475 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1476 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1477
1478 set_opt(sbi->s_mount_opt, RESERVATION);
1479
1480 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1481 NULL, 0))
1482 goto failed_mount;
1483
1484 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1485 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1486
1487 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1488 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1489 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1490 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1491 printk(KERN_WARNING
1492 "EXT3-fs warning: feature flags set on rev 0 fs, "
1493 "running e2fsck is recommended\n");
1494 /*
1495 * Check feature flags regardless of the revision level, since we
1496 * previously didn't change the revision level when setting the flags,
1497 * so there is a chance incompat flags are set on a rev 0 filesystem.
1498 */
1499 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1500 if (features) {
1501 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1502 "unsupported optional features (%x).\n",
1503 sb->s_id, le32_to_cpu(features));
1504 goto failed_mount;
1505 }
1506 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1507 if (!(sb->s_flags & MS_RDONLY) && features) {
1508 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1509 "unsupported optional features (%x).\n",
1510 sb->s_id, le32_to_cpu(features));
1511 goto failed_mount;
1512 }
1513 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1514
1515 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1516 blocksize > EXT3_MAX_BLOCK_SIZE) {
1517 printk(KERN_ERR
1518 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1519 blocksize, sb->s_id);
1520 goto failed_mount;
1521 }
1522
1523 hblock = bdev_hardsect_size(sb->s_bdev);
1524 if (sb->s_blocksize != blocksize) {
1525 /*
1526 * Make sure the blocksize for the filesystem is larger
1527 * than the hardware sectorsize for the machine.
1528 */
1529 if (blocksize < hblock) {
1530 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1531 "device blocksize %d.\n", blocksize, hblock);
1532 goto failed_mount;
1533 }
1534
1535 brelse (bh);
1536 sb_set_blocksize(sb, blocksize);
1537 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1538 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1539 bh = sb_bread(sb, logic_sb_block);
1540 if (!bh) {
1541 printk(KERN_ERR
1542 "EXT3-fs: Can't read superblock on 2nd try.\n");
1543 goto failed_mount;
1544 }
1545 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1546 sbi->s_es = es;
1547 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1548 printk (KERN_ERR
1549 "EXT3-fs: Magic mismatch, very weird !\n");
1550 goto failed_mount;
1551 }
1552 }
1553
1554 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1555
1556 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1557 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1558 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1559 } else {
1560 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1561 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1562 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1563 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1564 (sbi->s_inode_size > blocksize)) {
1565 printk (KERN_ERR
1566 "EXT3-fs: unsupported inode size: %d\n",
1567 sbi->s_inode_size);
1568 goto failed_mount;
1569 }
1570 }
1571 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1572 le32_to_cpu(es->s_log_frag_size);
1573 if (blocksize != sbi->s_frag_size) {
1574 printk(KERN_ERR
1575 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1576 sbi->s_frag_size, blocksize);
1577 goto failed_mount;
1578 }
1579 sbi->s_frags_per_block = 1;
1580 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1581 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1582 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1583 if (EXT3_INODE_SIZE(sb) == 0)
1584 goto cantfind_ext3;
1585 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1586 if (sbi->s_inodes_per_block == 0)
1587 goto cantfind_ext3;
1588 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1589 sbi->s_inodes_per_block;
1590 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1591 sbi->s_sbh = bh;
1592 sbi->s_mount_state = le16_to_cpu(es->s_state);
1593 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1594 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1595 for (i=0; i < 4; i++)
1596 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1597 sbi->s_def_hash_version = es->s_def_hash_version;
1598
1599 if (sbi->s_blocks_per_group > blocksize * 8) {
1600 printk (KERN_ERR
1601 "EXT3-fs: #blocks per group too big: %lu\n",
1602 sbi->s_blocks_per_group);
1603 goto failed_mount;
1604 }
1605 if (sbi->s_frags_per_group > blocksize * 8) {
1606 printk (KERN_ERR
1607 "EXT3-fs: #fragments per group too big: %lu\n",
1608 sbi->s_frags_per_group);
1609 goto failed_mount;
1610 }
1611 if (sbi->s_inodes_per_group > blocksize * 8) {
1612 printk (KERN_ERR
1613 "EXT3-fs: #inodes per group too big: %lu\n",
1614 sbi->s_inodes_per_group);
1615 goto failed_mount;
1616 }
1617
1618 if (le32_to_cpu(es->s_blocks_count) >
1619 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1620 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1621 " too large to mount safely\n", sb->s_id);
1622 if (sizeof(sector_t) < 8)
1623 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1624 "enabled\n");
1625 goto failed_mount;
1626 }
1627
1628 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1629 goto cantfind_ext3;
1630 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1631 le32_to_cpu(es->s_first_data_block) - 1)
1632 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
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;
1640 }
1641
1642 bgl_lock_init(&sbi->s_blockgroup_lock);
1643
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;
1652 }
1653 }
1654 if (!ext3_check_descriptors (sb)) {
1655 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1656 goto failed_mount2;
1657 }
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);
1661
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));
1668
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);
1681
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 */
1693
1694 sb->s_root = NULL;
1695
1696 needs_recovery = (es->s_last_orphan != 0 ||
1697 EXT3_HAS_INCOMPAT_FEATURE(sb,
1698 EXT3_FEATURE_INCOMPAT_RECOVER));
1699
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;
1717 }
1718
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;
1732
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;
1740 }
1741 default:
1742 break;
1743 }
1744
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);
1750 }
1751 }
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 */
1756
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;
1763 }
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;
1769 }
1770
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");
1790
1791 lock_kernel();
1792 return 0;
1793
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;
1799
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;
1822 }
1823
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)
1830 {
1831 struct ext3_sb_info *sbi = EXT3_SB(sb);
1832
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. */
1838
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);
1845 }
1846
1847 static journal_t *ext3_get_journal(struct super_block *sb,
1848 unsigned int journal_inum)
1849 {
1850 struct inode *journal_inode;
1851 journal_t *journal;
1852
1853 /* First, test for the existence of a valid inode on disk. Bad
1854 * things happen if we iget() an unused inode, as the subsequent
1855 * iput() will try to delete it. */
1856
1857 journal_inode = iget(sb, journal_inum);
1858 if (!journal_inode) {
1859 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1860 return NULL;
1861 }
1862 if (!journal_inode->i_nlink) {
1863 make_bad_inode(journal_inode);
1864 iput(journal_inode);
1865 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1866 return NULL;
1867 }
1868
1869 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1870 journal_inode, journal_inode->i_size);
1871 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1872 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1873 iput(journal_inode);
1874 return NULL;
1875 }
1876
1877 journal = journal_init_inode(journal_inode);
1878 if (!journal) {
1879 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1880 iput(journal_inode);
1881 return NULL;
1882 }
1883 journal->j_private = sb;
1884 ext3_init_journal_params(sb, journal);
1885 return journal;
1886 }
1887
1888 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1889 dev_t j_dev)
1890 {
1891 struct buffer_head * bh;
1892 journal_t *journal;
1893 ext3_fsblk_t start;
1894 ext3_fsblk_t len;
1895 int hblock, blocksize;
1896 ext3_fsblk_t sb_block;
1897 unsigned long offset;
1898 struct ext3_super_block * es;
1899 struct block_device *bdev;
1900
1901 bdev = ext3_blkdev_get(j_dev);
1902 if (bdev == NULL)
1903 return NULL;
1904
1905 if (bd_claim(bdev, sb)) {
1906 printk(KERN_ERR
1907 "EXT3: failed to claim external journal device.\n");
1908 blkdev_put(bdev);
1909 return NULL;
1910 }
1911
1912 blocksize = sb->s_blocksize;
1913 hblock = bdev_hardsect_size(bdev);
1914 if (blocksize < hblock) {
1915 printk(KERN_ERR
1916 "EXT3-fs: blocksize too small for journal device.\n");
1917 goto out_bdev;
1918 }
1919
1920 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1921 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1922 set_blocksize(bdev, blocksize);
1923 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1924 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1925 "external journal\n");
1926 goto out_bdev;
1927 }
1928
1929 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1930 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1931 !(le32_to_cpu(es->s_feature_incompat) &
1932 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1933 printk(KERN_ERR "EXT3-fs: external journal has "
1934 "bad superblock\n");
1935 brelse(bh);
1936 goto out_bdev;
1937 }
1938
1939 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1940 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1941 brelse(bh);
1942 goto out_bdev;
1943 }
1944
1945 len = le32_to_cpu(es->s_blocks_count);
1946 start = sb_block + 1;
1947 brelse(bh); /* we're done with the superblock */
1948
1949 journal = journal_init_dev(bdev, sb->s_bdev,
1950 start, len, blocksize);
1951 if (!journal) {
1952 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1953 goto out_bdev;
1954 }
1955 journal->j_private = sb;
1956 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1957 wait_on_buffer(journal->j_sb_buffer);
1958 if (!buffer_uptodate(journal->j_sb_buffer)) {
1959 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1960 goto out_journal;
1961 }
1962 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1963 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1964 "user (unsupported) - %d\n",
1965 be32_to_cpu(journal->j_superblock->s_nr_users));
1966 goto out_journal;
1967 }
1968 EXT3_SB(sb)->journal_bdev = bdev;
1969 ext3_init_journal_params(sb, journal);
1970 return journal;
1971 out_journal:
1972 journal_destroy(journal);
1973 out_bdev:
1974 ext3_blkdev_put(bdev);
1975 return NULL;
1976 }
1977
1978 static int ext3_load_journal(struct super_block *sb,
1979 struct ext3_super_block *es,
1980 unsigned long journal_devnum)
1981 {
1982 journal_t *journal;
1983 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
1984 dev_t journal_dev;
1985 int err = 0;
1986 int really_read_only;
1987
1988 if (journal_devnum &&
1989 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1990 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
1991 "numbers have changed\n");
1992 journal_dev = new_decode_dev(journal_devnum);
1993 } else
1994 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1995
1996 really_read_only = bdev_read_only(sb->s_bdev);
1997
1998 /*
1999 * Are we loading a blank journal or performing recovery after a
2000 * crash? For recovery, we need to check in advance whether we
2001 * can get read-write access to the device.
2002 */
2003
2004 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2005 if (sb->s_flags & MS_RDONLY) {
2006 printk(KERN_INFO "EXT3-fs: INFO: recovery "
2007 "required on readonly filesystem.\n");
2008 if (really_read_only) {
2009 printk(KERN_ERR "EXT3-fs: write access "
2010 "unavailable, cannot proceed.\n");
2011 return -EROFS;
2012 }
2013 printk (KERN_INFO "EXT3-fs: write access will "
2014 "be enabled during recovery.\n");
2015 }
2016 }
2017
2018 if (journal_inum && journal_dev) {
2019 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2020 "and inode journals!\n");
2021 return -EINVAL;
2022 }
2023
2024 if (journal_inum) {
2025 if (!(journal = ext3_get_journal(sb, journal_inum)))
2026 return -EINVAL;
2027 } else {
2028 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2029 return -EINVAL;
2030 }
2031
2032 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2033 err = journal_update_format(journal);
2034 if (err) {
2035 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2036 journal_destroy(journal);
2037 return err;
2038 }
2039 }
2040
2041 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2042 err = journal_wipe(journal, !really_read_only);
2043 if (!err)
2044 err = journal_load(journal);
2045
2046 if (err) {
2047 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2048 journal_destroy(journal);
2049 return err;
2050 }
2051
2052 EXT3_SB(sb)->s_journal = journal;
2053 ext3_clear_journal_err(sb, es);
2054
2055 if (journal_devnum &&
2056 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2057 es->s_journal_dev = cpu_to_le32(journal_devnum);
2058 sb->s_dirt = 1;
2059
2060 /* Make sure we flush the recovery flag to disk. */
2061 ext3_commit_super(sb, es, 1);
2062 }
2063
2064 return 0;
2065 }
2066
2067 static int ext3_create_journal(struct super_block * sb,
2068 struct ext3_super_block * es,
2069 unsigned int journal_inum)
2070 {
2071 journal_t *journal;
2072
2073 if (sb->s_flags & MS_RDONLY) {
2074 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2075 "create journal.\n");
2076 return -EROFS;
2077 }
2078
2079 if (!(journal = ext3_get_journal(sb, journal_inum)))
2080 return -EINVAL;
2081
2082 printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2083 journal_inum);
2084
2085 if (journal_create(journal)) {
2086 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2087 journal_destroy(journal);
2088 return -EIO;
2089 }
2090
2091 EXT3_SB(sb)->s_journal = journal;
2092
2093 ext3_update_dynamic_rev(sb);
2094 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2095 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2096
2097 es->s_journal_inum = cpu_to_le32(journal_inum);
2098 sb->s_dirt = 1;
2099
2100 /* Make sure we flush the recovery flag to disk. */
2101 ext3_commit_super(sb, es, 1);
2102
2103 return 0;
2104 }
2105
2106 static void ext3_commit_super (struct super_block * sb,
2107 struct ext3_super_block * es,
2108 int sync)
2109 {
2110 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2111
2112 if (!sbh)
2113 return;
2114 es->s_wtime = cpu_to_le32(get_seconds());
2115 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2116 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2117 BUFFER_TRACE(sbh, "marking dirty");
2118 mark_buffer_dirty(sbh);
2119 if (sync)
2120 sync_dirty_buffer(sbh);
2121 }
2122
2123
2124 /*
2125 * Have we just finished recovery? If so, and if we are mounting (or
2126 * remounting) the filesystem readonly, then we will end up with a
2127 * consistent fs on disk. Record that fact.
2128 */
2129 static void ext3_mark_recovery_complete(struct super_block * sb,
2130 struct ext3_super_block * es)
2131 {
2132 journal_t *journal = EXT3_SB(sb)->s_journal;
2133
2134 journal_lock_updates(journal);
2135 journal_flush(journal);
2136 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2137 sb->s_flags & MS_RDONLY) {
2138 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2139 sb->s_dirt = 0;
2140 ext3_commit_super(sb, es, 1);
2141 }
2142 journal_unlock_updates(journal);
2143 }
2144
2145 /*
2146 * If we are mounting (or read-write remounting) a filesystem whose journal
2147 * has recorded an error from a previous lifetime, move that error to the
2148 * main filesystem now.
2149 */
2150 static void ext3_clear_journal_err(struct super_block * sb,
2151 struct ext3_super_block * es)
2152 {
2153 journal_t *journal;
2154 int j_errno;
2155 const char *errstr;
2156
2157 journal = EXT3_SB(sb)->s_journal;
2158
2159 /*
2160 * Now check for any error status which may have been recorded in the
2161 * journal by a prior ext3_error() or ext3_abort()
2162 */
2163
2164 j_errno = journal_errno(journal);
2165 if (j_errno) {
2166 char nbuf[16];
2167
2168 errstr = ext3_decode_error(sb, j_errno, nbuf);
2169 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2170 "from previous mount: %s", errstr);
2171 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2172 "filesystem check.");
2173
2174 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2175 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2176 ext3_commit_super (sb, es, 1);
2177
2178 journal_clear_err(journal);
2179 }
2180 }
2181
2182 /*
2183 * Force the running and committing transactions to commit,
2184 * and wait on the commit.
2185 */
2186 int ext3_force_commit(struct super_block *sb)
2187 {
2188 journal_t *journal;
2189 int ret;
2190
2191 if (sb->s_flags & MS_RDONLY)
2192 return 0;
2193
2194 journal = EXT3_SB(sb)->s_journal;
2195 sb->s_dirt = 0;
2196 ret = ext3_journal_force_commit(journal);
2197 return ret;
2198 }
2199
2200 /*
2201 * Ext3 always journals updates to the superblock itself, so we don't
2202 * have to propagate any other updates to the superblock on disk at this
2203 * point. Just start an async writeback to get the buffers on their way
2204 * to the disk.
2205 *
2206 * This implicitly triggers the writebehind on sync().
2207 */
2208
2209 static void ext3_write_super (struct super_block * sb)
2210 {
2211 if (mutex_trylock(&sb->s_lock) != 0)
2212 BUG();
2213 sb->s_dirt = 0;
2214 }
2215
2216 static int ext3_sync_fs(struct super_block *sb, int wait)
2217 {
2218 tid_t target;
2219
2220 sb->s_dirt = 0;
2221 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2222 if (wait)
2223 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2224 }
2225 return 0;
2226 }
2227
2228 /*
2229 * LVM calls this function before a (read-only) snapshot is created. This
2230 * gives us a chance to flush the journal completely and mark the fs clean.
2231 */
2232 static void ext3_write_super_lockfs(struct super_block *sb)
2233 {
2234 sb->s_dirt = 0;
2235
2236 if (!(sb->s_flags & MS_RDONLY)) {
2237 journal_t *journal = EXT3_SB(sb)->s_journal;
2238
2239 /* Now we set up the journal barrier. */
2240 journal_lock_updates(journal);
2241 journal_flush(journal);
2242
2243 /* Journal blocked and flushed, clear needs_recovery flag. */
2244 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2245 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2246 }
2247 }
2248
2249 /*
2250 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2251 * flag here, even though the filesystem is not technically dirty yet.
2252 */
2253 static void ext3_unlockfs(struct super_block *sb)
2254 {
2255 if (!(sb->s_flags & MS_RDONLY)) {
2256 lock_super(sb);
2257 /* Reser the needs_recovery flag before the fs is unlocked. */
2258 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2259 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2260 unlock_super(sb);
2261 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2262 }
2263 }
2264
2265 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2266 {
2267 struct ext3_super_block * es;
2268 struct ext3_sb_info *sbi = EXT3_SB(sb);
2269 ext3_fsblk_t n_blocks_count = 0;
2270 unsigned long old_sb_flags;
2271 struct ext3_mount_options old_opts;
2272 int err;
2273 #ifdef CONFIG_QUOTA
2274 int i;
2275 #endif
2276
2277 /* Store the original options */
2278 old_sb_flags = sb->s_flags;
2279 old_opts.s_mount_opt = sbi->s_mount_opt;
2280 old_opts.s_resuid = sbi->s_resuid;
2281 old_opts.s_resgid = sbi->s_resgid;
2282 old_opts.s_commit_interval = sbi->s_commit_interval;
2283 #ifdef CONFIG_QUOTA
2284 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2285 for (i = 0; i < MAXQUOTAS; i++)
2286 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2287 #endif
2288
2289 /*
2290 * Allow the "check" option to be passed as a remount option.
2291 */
2292 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2293 err = -EINVAL;
2294 goto restore_opts;
2295 }
2296
2297 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2298 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2299
2300 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2301 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2302
2303 es = sbi->s_es;
2304
2305 ext3_init_journal_params(sb, sbi->s_journal);
2306
2307 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2308 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2309 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2310 err = -EROFS;
2311 goto restore_opts;
2312 }
2313
2314 if (*flags & MS_RDONLY) {
2315 /*
2316 * First of all, the unconditional stuff we have to do
2317 * to disable replay of the journal when we next remount
2318 */
2319 sb->s_flags |= MS_RDONLY;
2320
2321 /*
2322 * OK, test if we are remounting a valid rw partition
2323 * readonly, and if so set the rdonly flag and then
2324 * mark the partition as valid again.
2325 */
2326 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2327 (sbi->s_mount_state & EXT3_VALID_FS))
2328 es->s_state = cpu_to_le16(sbi->s_mount_state);
2329
2330 ext3_mark_recovery_complete(sb, es);
2331 } else {
2332 __le32 ret;
2333 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2334 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2335 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2336 "remount RDWR because of unsupported "
2337 "optional features (%x).\n",
2338 sb->s_id, le32_to_cpu(ret));
2339 err = -EROFS;
2340 goto restore_opts;
2341 }
2342 /*
2343 * Mounting a RDONLY partition read-write, so reread
2344 * and store the current valid flag. (It may have
2345 * been changed by e2fsck since we originally mounted
2346 * the partition.)
2347 */
2348 ext3_clear_journal_err(sb, es);
2349 sbi->s_mount_state = le16_to_cpu(es->s_state);
2350 if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2351 err = ret;
2352 goto restore_opts;
2353 }
2354 if (!ext3_setup_super (sb, es, 0))
2355 sb->s_flags &= ~MS_RDONLY;
2356 }
2357 }
2358 #ifdef CONFIG_QUOTA
2359 /* Release old quota file names */
2360 for (i = 0; i < MAXQUOTAS; i++)
2361 if (old_opts.s_qf_names[i] &&
2362 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2363 kfree(old_opts.s_qf_names[i]);
2364 #endif
2365 return 0;
2366 restore_opts:
2367 sb->s_flags = old_sb_flags;
2368 sbi->s_mount_opt = old_opts.s_mount_opt;
2369 sbi->s_resuid = old_opts.s_resuid;
2370 sbi->s_resgid = old_opts.s_resgid;
2371 sbi->s_commit_interval = old_opts.s_commit_interval;
2372 #ifdef CONFIG_QUOTA
2373 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2374 for (i = 0; i < MAXQUOTAS; i++) {
2375 if (sbi->s_qf_names[i] &&
2376 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2377 kfree(sbi->s_qf_names[i]);
2378 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2379 }
2380 #endif
2381 return err;
2382 }
2383
2384 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2385 {
2386 struct super_block *sb = dentry->d_sb;
2387 struct ext3_sb_info *sbi = EXT3_SB(sb);
2388 struct ext3_super_block *es = sbi->s_es;
2389 ext3_fsblk_t overhead;
2390 int i;
2391
2392 if (test_opt (sb, MINIX_DF))
2393 overhead = 0;
2394 else {
2395 unsigned long ngroups;
2396 ngroups = EXT3_SB(sb)->s_groups_count;
2397 smp_rmb();
2398
2399 /*
2400 * Compute the overhead (FS structures)
2401 */
2402
2403 /*
2404 * All of the blocks before first_data_block are
2405 * overhead
2406 */
2407 overhead = le32_to_cpu(es->s_first_data_block);
2408
2409 /*
2410 * Add the overhead attributed to the superblock and
2411 * block group descriptors. If the sparse superblocks
2412 * feature is turned on, then not all groups have this.
2413 */
2414 for (i = 0; i < ngroups; i++) {
2415 overhead += ext3_bg_has_super(sb, i) +
2416 ext3_bg_num_gdb(sb, i);
2417 cond_resched();
2418 }
2419
2420 /*
2421 * Every block group has an inode bitmap, a block
2422 * bitmap, and an inode table.
2423 */
2424 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2425 }
2426
2427 buf->f_type = EXT3_SUPER_MAGIC;
2428 buf->f_bsize = sb->s_blocksize;
2429 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2430 buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
2431 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2432 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2433 buf->f_bavail = 0;
2434 buf->f_files = le32_to_cpu(es->s_inodes_count);
2435 buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
2436 buf->f_namelen = EXT3_NAME_LEN;
2437 return 0;
2438 }
2439
2440 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2441 * is locked for write. Otherwise the are possible deadlocks:
2442 * Process 1 Process 2
2443 * ext3_create() quota_sync()
2444 * journal_start() write_dquot()
2445 * DQUOT_INIT() down(dqio_mutex)
2446 * down(dqio_mutex) journal_start()
2447 *
2448 */
2449
2450 #ifdef CONFIG_QUOTA
2451
2452 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2453 {
2454 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2455 }
2456
2457 static int ext3_dquot_initialize(struct inode *inode, int type)
2458 {
2459 handle_t *handle;
2460 int ret, err;
2461
2462 /* We may create quota structure so we need to reserve enough blocks */
2463 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2464 if (IS_ERR(handle))
2465 return PTR_ERR(handle);
2466 ret = dquot_initialize(inode, type);
2467 err = ext3_journal_stop(handle);
2468 if (!ret)
2469 ret = err;
2470 return ret;
2471 }
2472
2473 static int ext3_dquot_drop(struct inode *inode)
2474 {
2475 handle_t *handle;
2476 int ret, err;
2477
2478 /* We may delete quota structure so we need to reserve enough blocks */
2479 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2480 if (IS_ERR(handle))
2481 return PTR_ERR(handle);
2482 ret = dquot_drop(inode);
2483 err = ext3_journal_stop(handle);
2484 if (!ret)
2485 ret = err;
2486 return ret;
2487 }
2488
2489 static int ext3_write_dquot(struct dquot *dquot)
2490 {
2491 int ret, err;
2492 handle_t *handle;
2493 struct inode *inode;
2494
2495 inode = dquot_to_inode(dquot);
2496 handle = ext3_journal_start(inode,
2497 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2498 if (IS_ERR(handle))
2499 return PTR_ERR(handle);
2500 ret = dquot_commit(dquot);
2501 err = ext3_journal_stop(handle);
2502 if (!ret)
2503 ret = err;
2504 return ret;
2505 }
2506
2507 static int ext3_acquire_dquot(struct dquot *dquot)
2508 {
2509 int ret, err;
2510 handle_t *handle;
2511
2512 handle = ext3_journal_start(dquot_to_inode(dquot),
2513 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2514 if (IS_ERR(handle))
2515 return PTR_ERR(handle);
2516 ret = dquot_acquire(dquot);
2517 err = ext3_journal_stop(handle);
2518 if (!ret)
2519 ret = err;
2520 return ret;
2521 }
2522
2523 static int ext3_release_dquot(struct dquot *dquot)
2524 {
2525 int ret, err;
2526 handle_t *handle;
2527
2528 handle = ext3_journal_start(dquot_to_inode(dquot),
2529 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2530 if (IS_ERR(handle))
2531 return PTR_ERR(handle);
2532 ret = dquot_release(dquot);
2533 err = ext3_journal_stop(handle);
2534 if (!ret)
2535 ret = err;
2536 return ret;
2537 }
2538
2539 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2540 {
2541 /* Are we journalling quotas? */
2542 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2543 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2544 dquot_mark_dquot_dirty(dquot);
2545 return ext3_write_dquot(dquot);
2546 } else {
2547 return dquot_mark_dquot_dirty(dquot);
2548 }
2549 }
2550
2551 static int ext3_write_info(struct super_block *sb, int type)
2552 {
2553 int ret, err;
2554 handle_t *handle;
2555
2556 /* Data block + inode block */
2557 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2558 if (IS_ERR(handle))
2559 return PTR_ERR(handle);
2560 ret = dquot_commit_info(sb, type);
2561 err = ext3_journal_stop(handle);
2562 if (!ret)
2563 ret = err;
2564 return ret;
2565 }
2566
2567 /*
2568 * Turn on quotas during mount time - we need to find
2569 * the quota file and such...
2570 */
2571 static int ext3_quota_on_mount(struct super_block *sb, int type)
2572 {
2573 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2574 EXT3_SB(sb)->s_jquota_fmt, type);
2575 }
2576
2577 /*
2578 * Standard function to be called on quota_on
2579 */
2580 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2581 char *path)
2582 {
2583 int err;
2584 struct nameidata nd;
2585
2586 if (!test_opt(sb, QUOTA))
2587 return -EINVAL;
2588 /* Not journalling quota? */
2589 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2590 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2591 return vfs_quota_on(sb, type, format_id, path);
2592 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2593 if (err)
2594 return err;
2595 /* Quotafile not on the same filesystem? */
2596 if (nd.mnt->mnt_sb != sb) {
2597 path_release(&nd);
2598 return -EXDEV;
2599 }
2600 /* Quotafile not of fs root? */
2601 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2602 printk(KERN_WARNING
2603 "EXT3-fs: Quota file not on filesystem root. "
2604 "Journalled quota will not work.\n");
2605 path_release(&nd);
2606 return vfs_quota_on(sb, type, format_id, path);
2607 }
2608
2609 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2610 * acquiring the locks... As quota files are never truncated and quota code
2611 * itself serializes the operations (and noone else should touch the files)
2612 * we don't have to be afraid of races */
2613 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2614 size_t len, loff_t off)
2615 {
2616 struct inode *inode = sb_dqopt(sb)->files[type];
2617 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2618 int err = 0;
2619 int offset = off & (sb->s_blocksize - 1);
2620 int tocopy;
2621 size_t toread;
2622 struct buffer_head *bh;
2623 loff_t i_size = i_size_read(inode);
2624
2625 if (off > i_size)
2626 return 0;
2627 if (off+len > i_size)
2628 len = i_size-off;
2629 toread = len;
2630 while (toread > 0) {
2631 tocopy = sb->s_blocksize - offset < toread ?
2632 sb->s_blocksize - offset : toread;
2633 bh = ext3_bread(NULL, inode, blk, 0, &err);
2634 if (err)
2635 return err;
2636 if (!bh) /* A hole? */
2637 memset(data, 0, tocopy);
2638 else
2639 memcpy(data, bh->b_data+offset, tocopy);
2640 brelse(bh);
2641 offset = 0;
2642 toread -= tocopy;
2643 data += tocopy;
2644 blk++;
2645 }
2646 return len;
2647 }
2648
2649 /* Write to quotafile (we know the transaction is already started and has
2650 * enough credits) */
2651 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2652 const char *data, size_t len, loff_t off)
2653 {
2654 struct inode *inode = sb_dqopt(sb)->files[type];
2655 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2656 int err = 0;
2657 int offset = off & (sb->s_blocksize - 1);
2658 int tocopy;
2659 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2660 size_t towrite = len;
2661 struct buffer_head *bh;
2662 handle_t *handle = journal_current_handle();
2663
2664 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2665 while (towrite > 0) {
2666 tocopy = sb->s_blocksize - offset < towrite ?
2667 sb->s_blocksize - offset : towrite;
2668 bh = ext3_bread(handle, inode, blk, 1, &err);
2669 if (!bh)
2670 goto out;
2671 if (journal_quota) {
2672 err = ext3_journal_get_write_access(handle, bh);
2673 if (err) {
2674 brelse(bh);
2675 goto out;
2676 }
2677 }
2678 lock_buffer(bh);
2679 memcpy(bh->b_data+offset, data, tocopy);
2680 flush_dcache_page(bh->b_page);
2681 unlock_buffer(bh);
2682 if (journal_quota)
2683 err = ext3_journal_dirty_metadata(handle, bh);
2684 else {
2685 /* Always do at least ordered writes for quotas */
2686 err = ext3_journal_dirty_data(handle, bh);
2687 mark_buffer_dirty(bh);
2688 }
2689 brelse(bh);
2690 if (err)
2691 goto out;
2692 offset = 0;
2693 towrite -= tocopy;
2694 data += tocopy;
2695 blk++;
2696 }
2697 out:
2698 if (len == towrite)
2699 return err;
2700 if (inode->i_size < off+len-towrite) {
2701 i_size_write(inode, off+len-towrite);
2702 EXT3_I(inode)->i_disksize = inode->i_size;
2703 }
2704 inode->i_version++;
2705 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2706 ext3_mark_inode_dirty(handle, inode);
2707 mutex_unlock(&inode->i_mutex);
2708 return len - towrite;
2709 }
2710
2711 #endif
2712
2713 static int ext3_get_sb(struct file_system_type *fs_type,
2714 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2715 {
2716 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2717 }
2718
2719 static struct file_system_type ext3_fs_type = {
2720 .owner = THIS_MODULE,
2721 .name = "ext3",
2722 .get_sb = ext3_get_sb,
2723 .kill_sb = kill_block_super,
2724 .fs_flags = FS_REQUIRES_DEV,
2725 };
2726
2727 static int __init init_ext3_fs(void)
2728 {
2729 int err = init_ext3_xattr();
2730 if (err)
2731 return err;
2732 err = init_inodecache();
2733 if (err)
2734 goto out1;
2735 err = register_filesystem(&ext3_fs_type);
2736 if (err)
2737 goto out;
2738 return 0;
2739 out:
2740 destroy_inodecache();
2741 out1:
2742 exit_ext3_xattr();
2743 return err;
2744 }
2745
2746 static void __exit exit_ext3_fs(void)
2747 {
2748 unregister_filesystem(&ext3_fs_type);
2749 destroy_inodecache();
2750 exit_ext3_xattr();
2751 }
2752
2753 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2754 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2755 MODULE_LICENSE("GPL");
2756 module_init(init_ext3_fs)
2757 module_exit(exit_ext3_fs)
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