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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / fs / ext3 / super.c
blobad536066408229da9955e41e27a0f5e72756cccd
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/exportfs.h>
33 #include <linux/vfs.h>
34 #include <linux/random.h>
35 #include <linux/mount.h>
36 #include <linux/namei.h>
37 #include <linux/quotaops.h>
38 #include <linux/seq_file.h>
39 #include <linux/log2.h>
40
41 #include <asm/uaccess.h>
42
43 #include "xattr.h"
44 #include "acl.h"
45 #include "namei.h"
46
47 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
48 unsigned long journal_devnum);
49 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
50 unsigned int);
51 static void ext3_commit_super (struct super_block * sb,
52 struct ext3_super_block * es,
53 int sync);
54 static void ext3_mark_recovery_complete(struct super_block * sb,
55 struct ext3_super_block * es);
56 static void ext3_clear_journal_err(struct super_block * sb,
57 struct ext3_super_block * es);
58 static int ext3_sync_fs(struct super_block *sb, int wait);
59 static const char *ext3_decode_error(struct super_block * sb, int errno,
60 char nbuf[16]);
61 static int ext3_remount (struct super_block * sb, int * flags, char * data);
62 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
63 static void ext3_unlockfs(struct super_block *sb);
64 static void ext3_write_super (struct super_block * sb);
65 static void ext3_write_super_lockfs(struct super_block *sb);
66
67 /*
68 * Wrappers for journal_start/end.
69 *
70 * The only special thing we need to do here is to make sure that all
71 * journal_end calls result in the superblock being marked dirty, so
72 * that sync() will call the filesystem's write_super callback if
73 * appropriate.
74 */
75 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
76 {
77 journal_t *journal;
78
79 if (sb->s_flags & MS_RDONLY)
80 return ERR_PTR(-EROFS);
81
82 /* Special case here: if the journal has aborted behind our
83 * backs (eg. EIO in the commit thread), then we still need to
84 * take the FS itself readonly cleanly. */
85 journal = EXT3_SB(sb)->s_journal;
86 if (is_journal_aborted(journal)) {
87 ext3_abort(sb, __FUNCTION__,
88 "Detected aborted journal");
89 return ERR_PTR(-EROFS);
90 }
91
92 return journal_start(journal, nblocks);
93 }
94
95 /*
96 * The only special thing we need to do here is to make sure that all
97 * journal_stop calls result in the superblock being marked dirty, so
98 * that sync() will call the filesystem's write_super callback if
99 * appropriate.
100 */
101 int __ext3_journal_stop(const char *where, handle_t *handle)
102 {
103 struct super_block *sb;
104 int err;
105 int rc;
106
107 sb = handle->h_transaction->t_journal->j_private;
108 err = handle->h_err;
109 rc = journal_stop(handle);
110
111 if (!err)
112 err = rc;
113 if (err)
114 __ext3_std_error(sb, where, err);
115 return err;
116 }
117
118 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
119 struct buffer_head *bh, handle_t *handle, int err)
120 {
121 char nbuf[16];
122 const char *errstr = ext3_decode_error(NULL, err, nbuf);
123
124 if (bh)
125 BUFFER_TRACE(bh, "abort");
126
127 if (!handle->h_err)
128 handle->h_err = err;
129
130 if (is_handle_aborted(handle))
131 return;
132
133 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
134 caller, errstr, err_fn);
135
136 journal_abort_handle(handle);
137 }
138
139 /* Deal with the reporting of failure conditions on a filesystem such as
140 * inconsistencies detected or read IO failures.
141 *
142 * On ext2, we can store the error state of the filesystem in the
143 * superblock. That is not possible on ext3, because we may have other
144 * write ordering constraints on the superblock which prevent us from
145 * writing it out straight away; and given that the journal is about to
146 * be aborted, we can't rely on the current, or future, transactions to
147 * write out the superblock safely.
148 *
149 * We'll just use the journal_abort() error code to record an error in
150 * the journal instead. On recovery, the journal will compain about
151 * that error until we've noted it down and cleared it.
152 */
153
154 static void ext3_handle_error(struct super_block *sb)
155 {
156 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
157
158 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
159 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
160
161 if (sb->s_flags & MS_RDONLY)
162 return;
163
164 if (!test_opt (sb, ERRORS_CONT)) {
165 journal_t *journal = EXT3_SB(sb)->s_journal;
166
167 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
168 if (journal)
169 journal_abort(journal, -EIO);
170 }
171 if (test_opt (sb, ERRORS_RO)) {
172 printk (KERN_CRIT "Remounting filesystem read-only\n");
173 sb->s_flags |= MS_RDONLY;
174 }
175 ext3_commit_super(sb, es, 1);
176 if (test_opt(sb, ERRORS_PANIC))
177 panic("EXT3-fs (device %s): panic forced after error\n",
178 sb->s_id);
179 }
180
181 void ext3_error (struct super_block * sb, const char * function,
182 const char * fmt, ...)
183 {
184 va_list args;
185
186 va_start(args, fmt);
187 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
188 vprintk(fmt, args);
189 printk("\n");
190 va_end(args);
191
192 ext3_handle_error(sb);
193 }
194
195 static const char *ext3_decode_error(struct super_block * sb, int errno,
196 char nbuf[16])
197 {
198 char *errstr = NULL;
199
200 switch (errno) {
201 case -EIO:
202 errstr = "IO failure";
203 break;
204 case -ENOMEM:
205 errstr = "Out of memory";
206 break;
207 case -EROFS:
208 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
209 errstr = "Journal has aborted";
210 else
211 errstr = "Readonly filesystem";
212 break;
213 default:
214 /* If the caller passed in an extra buffer for unknown
215 * errors, textualise them now. Else we just return
216 * NULL. */
217 if (nbuf) {
218 /* Check for truncated error codes... */
219 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
220 errstr = nbuf;
221 }
222 break;
223 }
224
225 return errstr;
226 }
227
228 /* __ext3_std_error decodes expected errors from journaling functions
229 * automatically and invokes the appropriate error response. */
230
231 void __ext3_std_error (struct super_block * sb, const char * function,
232 int errno)
233 {
234 char nbuf[16];
235 const char *errstr;
236
237 /* Special case: if the error is EROFS, and we're not already
238 * inside a transaction, then there's really no point in logging
239 * an error. */
240 if (errno == -EROFS && journal_current_handle() == NULL &&
241 (sb->s_flags & MS_RDONLY))
242 return;
243
244 errstr = ext3_decode_error(sb, errno, nbuf);
245 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
246 sb->s_id, function, errstr);
247
248 ext3_handle_error(sb);
249 }
250
251 /*
252 * ext3_abort is a much stronger failure handler than ext3_error. The
253 * abort function may be used to deal with unrecoverable failures such
254 * as journal IO errors or ENOMEM at a critical moment in log management.
255 *
256 * We unconditionally force the filesystem into an ABORT|READONLY state,
257 * unless the error response on the fs has been set to panic in which
258 * case we take the easy way out and panic immediately.
259 */
260
261 void ext3_abort (struct super_block * sb, const char * function,
262 const char * fmt, ...)
263 {
264 va_list args;
265
266 printk (KERN_CRIT "ext3_abort called.\n");
267
268 va_start(args, fmt);
269 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
270 vprintk(fmt, args);
271 printk("\n");
272 va_end(args);
273
274 if (test_opt(sb, ERRORS_PANIC))
275 panic("EXT3-fs panic from previous error\n");
276
277 if (sb->s_flags & MS_RDONLY)
278 return;
279
280 printk(KERN_CRIT "Remounting filesystem read-only\n");
281 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
282 sb->s_flags |= MS_RDONLY;
283 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
284 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
285 }
286
287 void ext3_warning (struct super_block * sb, const char * function,
288 const char * fmt, ...)
289 {
290 va_list args;
291
292 va_start(args, fmt);
293 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
294 sb->s_id, function);
295 vprintk(fmt, args);
296 printk("\n");
297 va_end(args);
298 }
299
300 void ext3_update_dynamic_rev(struct super_block *sb)
301 {
302 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
303
304 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
305 return;
306
307 ext3_warning(sb, __FUNCTION__,
308 "updating to rev %d because of new feature flag, "
309 "running e2fsck is recommended",
310 EXT3_DYNAMIC_REV);
311
312 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
313 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
314 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
315 /* leave es->s_feature_*compat flags alone */
316 /* es->s_uuid will be set by e2fsck if empty */
317
318 /*
319 * The rest of the superblock fields should be zero, and if not it
320 * means they are likely already in use, so leave them alone. We
321 * can leave it up to e2fsck to clean up any inconsistencies there.
322 */
323 }
324
325 /*
326 * Open the external journal device
327 */
328 static struct block_device *ext3_blkdev_get(dev_t dev)
329 {
330 struct block_device *bdev;
331 char b[BDEVNAME_SIZE];
332
333 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
334 if (IS_ERR(bdev))
335 goto fail;
336 return bdev;
337
338 fail:
339 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
340 __bdevname(dev, b), PTR_ERR(bdev));
341 return NULL;
342 }
343
344 /*
345 * Release the journal device
346 */
347 static int ext3_blkdev_put(struct block_device *bdev)
348 {
349 bd_release(bdev);
350 return blkdev_put(bdev);
351 }
352
353 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
354 {
355 struct block_device *bdev;
356 int ret = -ENODEV;
357
358 bdev = sbi->journal_bdev;
359 if (bdev) {
360 ret = ext3_blkdev_put(bdev);
361 sbi->journal_bdev = NULL;
362 }
363 return ret;
364 }
365
366 static inline struct inode *orphan_list_entry(struct list_head *l)
367 {
368 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
369 }
370
371 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
372 {
373 struct list_head *l;
374
375 printk(KERN_ERR "sb orphan head is %d\n",
376 le32_to_cpu(sbi->s_es->s_last_orphan));
377
378 printk(KERN_ERR "sb_info orphan list:\n");
379 list_for_each(l, &sbi->s_orphan) {
380 struct inode *inode = orphan_list_entry(l);
381 printk(KERN_ERR " "
382 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
383 inode->i_sb->s_id, inode->i_ino, inode,
384 inode->i_mode, inode->i_nlink,
385 NEXT_ORPHAN(inode));
386 }
387 }
388
389 static void ext3_put_super (struct super_block * sb)
390 {
391 struct ext3_sb_info *sbi = EXT3_SB(sb);
392 struct ext3_super_block *es = sbi->s_es;
393 int i;
394
395 ext3_xattr_put_super(sb);
396 journal_destroy(sbi->s_journal);
397 if (!(sb->s_flags & MS_RDONLY)) {
398 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
399 es->s_state = cpu_to_le16(sbi->s_mount_state);
400 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
401 mark_buffer_dirty(sbi->s_sbh);
402 ext3_commit_super(sb, es, 1);
403 }
404
405 for (i = 0; i < sbi->s_gdb_count; i++)
406 brelse(sbi->s_group_desc[i]);
407 kfree(sbi->s_group_desc);
408 percpu_counter_destroy(&sbi->s_freeblocks_counter);
409 percpu_counter_destroy(&sbi->s_freeinodes_counter);
410 percpu_counter_destroy(&sbi->s_dirs_counter);
411 brelse(sbi->s_sbh);
412 #ifdef CONFIG_QUOTA
413 for (i = 0; i < MAXQUOTAS; i++)
414 kfree(sbi->s_qf_names[i]);
415 #endif
416
417 /* Debugging code just in case the in-memory inode orphan list
418 * isn't empty. The on-disk one can be non-empty if we've
419 * detected an error and taken the fs readonly, but the
420 * in-memory list had better be clean by this point. */
421 if (!list_empty(&sbi->s_orphan))
422 dump_orphan_list(sb, sbi);
423 J_ASSERT(list_empty(&sbi->s_orphan));
424
425 invalidate_bdev(sb->s_bdev);
426 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
427 /*
428 * Invalidate the journal device's buffers. We don't want them
429 * floating about in memory - the physical journal device may
430 * hotswapped, and it breaks the `ro-after' testing code.
431 */
432 sync_blockdev(sbi->journal_bdev);
433 invalidate_bdev(sbi->journal_bdev);
434 ext3_blkdev_remove(sbi);
435 }
436 sb->s_fs_info = NULL;
437 kfree(sbi);
438 return;
439 }
440
441 static struct kmem_cache *ext3_inode_cachep;
442
443 /*
444 * Called inside transaction, so use GFP_NOFS
445 */
446 static struct inode *ext3_alloc_inode(struct super_block *sb)
447 {
448 struct ext3_inode_info *ei;
449
450 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
451 if (!ei)
452 return NULL;
453 #ifdef CONFIG_EXT3_FS_POSIX_ACL
454 ei->i_acl = EXT3_ACL_NOT_CACHED;
455 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
456 #endif
457 ei->i_block_alloc_info = NULL;
458 ei->vfs_inode.i_version = 1;
459 return &ei->vfs_inode;
460 }
461
462 static void ext3_destroy_inode(struct inode *inode)
463 {
464 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
465 printk("EXT3 Inode %p: orphan list check failed!\n",
466 EXT3_I(inode));
467 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
468 EXT3_I(inode), sizeof(struct ext3_inode_info),
469 false);
470 dump_stack();
471 }
472 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
473 }
474
475 static void init_once(struct kmem_cache * cachep, void *foo)
476 {
477 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
478
479 INIT_LIST_HEAD(&ei->i_orphan);
480 #ifdef CONFIG_EXT3_FS_XATTR
481 init_rwsem(&ei->xattr_sem);
482 #endif
483 mutex_init(&ei->truncate_mutex);
484 inode_init_once(&ei->vfs_inode);
485 }
486
487 static int init_inodecache(void)
488 {
489 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
490 sizeof(struct ext3_inode_info),
491 0, (SLAB_RECLAIM_ACCOUNT|
492 SLAB_MEM_SPREAD),
493 init_once);
494 if (ext3_inode_cachep == NULL)
495 return -ENOMEM;
496 return 0;
497 }
498
499 static void destroy_inodecache(void)
500 {
501 kmem_cache_destroy(ext3_inode_cachep);
502 }
503
504 static void ext3_clear_inode(struct inode *inode)
505 {
506 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
507 #ifdef CONFIG_EXT3_FS_POSIX_ACL
508 if (EXT3_I(inode)->i_acl &&
509 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
510 posix_acl_release(EXT3_I(inode)->i_acl);
511 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
512 }
513 if (EXT3_I(inode)->i_default_acl &&
514 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
515 posix_acl_release(EXT3_I(inode)->i_default_acl);
516 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
517 }
518 #endif
519 ext3_discard_reservation(inode);
520 EXT3_I(inode)->i_block_alloc_info = NULL;
521 if (unlikely(rsv))
522 kfree(rsv);
523 }
524
525 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
526 {
527 #if defined(CONFIG_QUOTA)
528 struct ext3_sb_info *sbi = EXT3_SB(sb);
529
530 if (sbi->s_jquota_fmt)
531 seq_printf(seq, ",jqfmt=%s",
532 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
533
534 if (sbi->s_qf_names[USRQUOTA])
535 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
536
537 if (sbi->s_qf_names[GRPQUOTA])
538 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
539
540 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
541 seq_puts(seq, ",usrquota");
542
543 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
544 seq_puts(seq, ",grpquota");
545 #endif
546 }
547
548 /*
549 * Show an option if
550 * - it's set to a non-default value OR
551 * - if the per-sb default is different from the global default
552 */
553 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
554 {
555 struct super_block *sb = vfs->mnt_sb;
556 struct ext3_sb_info *sbi = EXT3_SB(sb);
557 struct ext3_super_block *es = sbi->s_es;
558 unsigned long def_mount_opts;
559
560 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
561
562 if (sbi->s_sb_block != 1)
563 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
564 if (test_opt(sb, MINIX_DF))
565 seq_puts(seq, ",minixdf");
566 if (test_opt(sb, GRPID))
567 seq_puts(seq, ",grpid");
568 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
569 seq_puts(seq, ",nogrpid");
570 if (sbi->s_resuid != EXT3_DEF_RESUID ||
571 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
572 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
573 }
574 if (sbi->s_resgid != EXT3_DEF_RESGID ||
575 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
576 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
577 }
578 if (test_opt(sb, ERRORS_RO)) {
579 int def_errors = le16_to_cpu(es->s_errors);
580
581 if (def_errors == EXT3_ERRORS_PANIC ||
582 def_errors == EXT3_ERRORS_CONTINUE) {
583 seq_puts(seq, ",errors=remount-ro");
584 }
585 }
586 if (test_opt(sb, ERRORS_CONT))
587 seq_puts(seq, ",errors=continue");
588 if (test_opt(sb, ERRORS_PANIC))
589 seq_puts(seq, ",errors=panic");
590 if (test_opt(sb, NO_UID32))
591 seq_puts(seq, ",nouid32");
592 if (test_opt(sb, DEBUG))
593 seq_puts(seq, ",debug");
594 if (test_opt(sb, OLDALLOC))
595 seq_puts(seq, ",oldalloc");
596 #ifdef CONFIG_EXT3_FS_XATTR
597 if (test_opt(sb, XATTR_USER))
598 seq_puts(seq, ",user_xattr");
599 if (!test_opt(sb, XATTR_USER) &&
600 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
601 seq_puts(seq, ",nouser_xattr");
602 }
603 #endif
604 #ifdef CONFIG_EXT3_FS_POSIX_ACL
605 if (test_opt(sb, POSIX_ACL))
606 seq_puts(seq, ",acl");
607 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
608 seq_puts(seq, ",noacl");
609 #endif
610 if (!test_opt(sb, RESERVATION))
611 seq_puts(seq, ",noreservation");
612 if (sbi->s_commit_interval) {
613 seq_printf(seq, ",commit=%u",
614 (unsigned) (sbi->s_commit_interval / HZ));
615 }
616 if (test_opt(sb, BARRIER))
617 seq_puts(seq, ",barrier=1");
618 if (test_opt(sb, NOBH))
619 seq_puts(seq, ",nobh");
620
621 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
622 seq_puts(seq, ",data=journal");
623 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
624 seq_puts(seq, ",data=ordered");
625 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
626 seq_puts(seq, ",data=writeback");
627
628 ext3_show_quota_options(seq, sb);
629
630 return 0;
631 }
632
633
634 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
635 u64 ino, u32 generation)
636 {
637 struct inode *inode;
638
639 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
640 return ERR_PTR(-ESTALE);
641 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
642 return ERR_PTR(-ESTALE);
643
644 /* iget isn't really right if the inode is currently unallocated!!
645 *
646 * ext3_read_inode will return a bad_inode if the inode had been
647 * deleted, so we should be safe.
648 *
649 * Currently we don't know the generation for parent directory, so
650 * a generation of 0 means "accept any"
651 */
652 inode = ext3_iget(sb, ino);
653 if (IS_ERR(inode))
654 return ERR_CAST(inode);
655 if (generation && inode->i_generation != generation) {
656 iput(inode);
657 return ERR_PTR(-ESTALE);
658 }
659
660 return inode;
661 }
662
663 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
664 int fh_len, int fh_type)
665 {
666 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
667 ext3_nfs_get_inode);
668 }
669
670 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
671 int fh_len, int fh_type)
672 {
673 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
674 ext3_nfs_get_inode);
675 }
676
677 #ifdef CONFIG_QUOTA
678 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
679 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
680
681 static int ext3_dquot_initialize(struct inode *inode, int type);
682 static int ext3_dquot_drop(struct inode *inode);
683 static int ext3_write_dquot(struct dquot *dquot);
684 static int ext3_acquire_dquot(struct dquot *dquot);
685 static int ext3_release_dquot(struct dquot *dquot);
686 static int ext3_mark_dquot_dirty(struct dquot *dquot);
687 static int ext3_write_info(struct super_block *sb, int type);
688 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
689 static int ext3_quota_on_mount(struct super_block *sb, int type);
690 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
691 size_t len, loff_t off);
692 static ssize_t ext3_quota_write(struct super_block *sb, int type,
693 const char *data, size_t len, loff_t off);
694
695 static struct dquot_operations ext3_quota_operations = {
696 .initialize = ext3_dquot_initialize,
697 .drop = ext3_dquot_drop,
698 .alloc_space = dquot_alloc_space,
699 .alloc_inode = dquot_alloc_inode,
700 .free_space = dquot_free_space,
701 .free_inode = dquot_free_inode,
702 .transfer = dquot_transfer,
703 .write_dquot = ext3_write_dquot,
704 .acquire_dquot = ext3_acquire_dquot,
705 .release_dquot = ext3_release_dquot,
706 .mark_dirty = ext3_mark_dquot_dirty,
707 .write_info = ext3_write_info
708 };
709
710 static struct quotactl_ops ext3_qctl_operations = {
711 .quota_on = ext3_quota_on,
712 .quota_off = vfs_quota_off,
713 .quota_sync = vfs_quota_sync,
714 .get_info = vfs_get_dqinfo,
715 .set_info = vfs_set_dqinfo,
716 .get_dqblk = vfs_get_dqblk,
717 .set_dqblk = vfs_set_dqblk
718 };
719 #endif
720
721 static const struct super_operations ext3_sops = {
722 .alloc_inode = ext3_alloc_inode,
723 .destroy_inode = ext3_destroy_inode,
724 .write_inode = ext3_write_inode,
725 .dirty_inode = ext3_dirty_inode,
726 .delete_inode = ext3_delete_inode,
727 .put_super = ext3_put_super,
728 .write_super = ext3_write_super,
729 .sync_fs = ext3_sync_fs,
730 .write_super_lockfs = ext3_write_super_lockfs,
731 .unlockfs = ext3_unlockfs,
732 .statfs = ext3_statfs,
733 .remount_fs = ext3_remount,
734 .clear_inode = ext3_clear_inode,
735 .show_options = ext3_show_options,
736 #ifdef CONFIG_QUOTA
737 .quota_read = ext3_quota_read,
738 .quota_write = ext3_quota_write,
739 #endif
740 };
741
742 static const struct export_operations ext3_export_ops = {
743 .fh_to_dentry = ext3_fh_to_dentry,
744 .fh_to_parent = ext3_fh_to_parent,
745 .get_parent = ext3_get_parent,
746 };
747
748 enum {
749 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
750 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
751 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
752 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
753 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
754 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
755 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
756 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
757 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
758 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
759 Opt_grpquota
760 };
761
762 static match_table_t tokens = {
763 {Opt_bsd_df, "bsddf"},
764 {Opt_minix_df, "minixdf"},
765 {Opt_grpid, "grpid"},
766 {Opt_grpid, "bsdgroups"},
767 {Opt_nogrpid, "nogrpid"},
768 {Opt_nogrpid, "sysvgroups"},
769 {Opt_resgid, "resgid=%u"},
770 {Opt_resuid, "resuid=%u"},
771 {Opt_sb, "sb=%u"},
772 {Opt_err_cont, "errors=continue"},
773 {Opt_err_panic, "errors=panic"},
774 {Opt_err_ro, "errors=remount-ro"},
775 {Opt_nouid32, "nouid32"},
776 {Opt_nocheck, "nocheck"},
777 {Opt_nocheck, "check=none"},
778 {Opt_debug, "debug"},
779 {Opt_oldalloc, "oldalloc"},
780 {Opt_orlov, "orlov"},
781 {Opt_user_xattr, "user_xattr"},
782 {Opt_nouser_xattr, "nouser_xattr"},
783 {Opt_acl, "acl"},
784 {Opt_noacl, "noacl"},
785 {Opt_reservation, "reservation"},
786 {Opt_noreservation, "noreservation"},
787 {Opt_noload, "noload"},
788 {Opt_nobh, "nobh"},
789 {Opt_bh, "bh"},
790 {Opt_commit, "commit=%u"},
791 {Opt_journal_update, "journal=update"},
792 {Opt_journal_inum, "journal=%u"},
793 {Opt_journal_dev, "journal_dev=%u"},
794 {Opt_abort, "abort"},
795 {Opt_data_journal, "data=journal"},
796 {Opt_data_ordered, "data=ordered"},
797 {Opt_data_writeback, "data=writeback"},
798 {Opt_offusrjquota, "usrjquota="},
799 {Opt_usrjquota, "usrjquota=%s"},
800 {Opt_offgrpjquota, "grpjquota="},
801 {Opt_grpjquota, "grpjquota=%s"},
802 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
803 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
804 {Opt_grpquota, "grpquota"},
805 {Opt_noquota, "noquota"},
806 {Opt_quota, "quota"},
807 {Opt_usrquota, "usrquota"},
808 {Opt_barrier, "barrier=%u"},
809 {Opt_resize, "resize"},
810 {Opt_err, NULL},
811 };
812
813 static ext3_fsblk_t get_sb_block(void **data)
814 {
815 ext3_fsblk_t sb_block;
816 char *options = (char *) *data;
817
818 if (!options || strncmp(options, "sb=", 3) != 0)
819 return 1; /* Default location */
820 options += 3;
821 /*todo: use simple_strtoll with >32bit ext3 */
822 sb_block = simple_strtoul(options, &options, 0);
823 if (*options && *options != ',') {
824 printk("EXT3-fs: Invalid sb specification: %s\n",
825 (char *) *data);
826 return 1;
827 }
828 if (*options == ',')
829 options++;
830 *data = (void *) options;
831 return sb_block;
832 }
833
834 static int parse_options (char *options, struct super_block *sb,
835 unsigned int *inum, unsigned long *journal_devnum,
836 ext3_fsblk_t *n_blocks_count, int is_remount)
837 {
838 struct ext3_sb_info *sbi = EXT3_SB(sb);
839 char * p;
840 substring_t args[MAX_OPT_ARGS];
841 int data_opt = 0;
842 int option;
843 #ifdef CONFIG_QUOTA
844 int qtype;
845 char *qname;
846 #endif
847
848 if (!options)
849 return 1;
850
851 while ((p = strsep (&options, ",")) != NULL) {
852 int token;
853 if (!*p)
854 continue;
855
856 token = match_token(p, tokens, args);
857 switch (token) {
858 case Opt_bsd_df:
859 clear_opt (sbi->s_mount_opt, MINIX_DF);
860 break;
861 case Opt_minix_df:
862 set_opt (sbi->s_mount_opt, MINIX_DF);
863 break;
864 case Opt_grpid:
865 set_opt (sbi->s_mount_opt, GRPID);
866 break;
867 case Opt_nogrpid:
868 clear_opt (sbi->s_mount_opt, GRPID);
869 break;
870 case Opt_resuid:
871 if (match_int(&args[0], &option))
872 return 0;
873 sbi->s_resuid = option;
874 break;
875 case Opt_resgid:
876 if (match_int(&args[0], &option))
877 return 0;
878 sbi->s_resgid = option;
879 break;
880 case Opt_sb:
881 /* handled by get_sb_block() instead of here */
882 /* *sb_block = match_int(&args[0]); */
883 break;
884 case Opt_err_panic:
885 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
886 clear_opt (sbi->s_mount_opt, ERRORS_RO);
887 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
888 break;
889 case Opt_err_ro:
890 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
891 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
892 set_opt (sbi->s_mount_opt, ERRORS_RO);
893 break;
894 case Opt_err_cont:
895 clear_opt (sbi->s_mount_opt, ERRORS_RO);
896 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
897 set_opt (sbi->s_mount_opt, ERRORS_CONT);
898 break;
899 case Opt_nouid32:
900 set_opt (sbi->s_mount_opt, NO_UID32);
901 break;
902 case Opt_nocheck:
903 clear_opt (sbi->s_mount_opt, CHECK);
904 break;
905 case Opt_debug:
906 set_opt (sbi->s_mount_opt, DEBUG);
907 break;
908 case Opt_oldalloc:
909 set_opt (sbi->s_mount_opt, OLDALLOC);
910 break;
911 case Opt_orlov:
912 clear_opt (sbi->s_mount_opt, OLDALLOC);
913 break;
914 #ifdef CONFIG_EXT3_FS_XATTR
915 case Opt_user_xattr:
916 set_opt (sbi->s_mount_opt, XATTR_USER);
917 break;
918 case Opt_nouser_xattr:
919 clear_opt (sbi->s_mount_opt, XATTR_USER);
920 break;
921 #else
922 case Opt_user_xattr:
923 case Opt_nouser_xattr:
924 printk("EXT3 (no)user_xattr options not supported\n");
925 break;
926 #endif
927 #ifdef CONFIG_EXT3_FS_POSIX_ACL
928 case Opt_acl:
929 set_opt(sbi->s_mount_opt, POSIX_ACL);
930 break;
931 case Opt_noacl:
932 clear_opt(sbi->s_mount_opt, POSIX_ACL);
933 break;
934 #else
935 case Opt_acl:
936 case Opt_noacl:
937 printk("EXT3 (no)acl options not supported\n");
938 break;
939 #endif
940 case Opt_reservation:
941 set_opt(sbi->s_mount_opt, RESERVATION);
942 break;
943 case Opt_noreservation:
944 clear_opt(sbi->s_mount_opt, RESERVATION);
945 break;
946 case Opt_journal_update:
947 /* @@@ FIXME */
948 /* Eventually we will want to be able to create
949 a journal file here. For now, only allow the
950 user to specify an existing inode to be the
951 journal file. */
952 if (is_remount) {
953 printk(KERN_ERR "EXT3-fs: cannot specify "
954 "journal on remount\n");
955 return 0;
956 }
957 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
958 break;
959 case Opt_journal_inum:
960 if (is_remount) {
961 printk(KERN_ERR "EXT3-fs: cannot specify "
962 "journal on remount\n");
963 return 0;
964 }
965 if (match_int(&args[0], &option))
966 return 0;
967 *inum = option;
968 break;
969 case Opt_journal_dev:
970 if (is_remount) {
971 printk(KERN_ERR "EXT3-fs: cannot specify "
972 "journal on remount\n");
973 return 0;
974 }
975 if (match_int(&args[0], &option))
976 return 0;
977 *journal_devnum = option;
978 break;
979 case Opt_noload:
980 set_opt (sbi->s_mount_opt, NOLOAD);
981 break;
982 case Opt_commit:
983 if (match_int(&args[0], &option))
984 return 0;
985 if (option < 0)
986 return 0;
987 if (option == 0)
988 option = JBD_DEFAULT_MAX_COMMIT_AGE;
989 sbi->s_commit_interval = HZ * option;
990 break;
991 case Opt_data_journal:
992 data_opt = EXT3_MOUNT_JOURNAL_DATA;
993 goto datacheck;
994 case Opt_data_ordered:
995 data_opt = EXT3_MOUNT_ORDERED_DATA;
996 goto datacheck;
997 case Opt_data_writeback:
998 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
999 datacheck:
1000 if (is_remount) {
1001 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1002 != data_opt) {
1003 printk(KERN_ERR
1004 "EXT3-fs: cannot change data "
1005 "mode on remount\n");
1006 return 0;
1007 }
1008 } else {
1009 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1010 sbi->s_mount_opt |= data_opt;
1011 }
1012 break;
1013 #ifdef CONFIG_QUOTA
1014 case Opt_usrjquota:
1015 qtype = USRQUOTA;
1016 goto set_qf_name;
1017 case Opt_grpjquota:
1018 qtype = GRPQUOTA;
1019 set_qf_name:
1020 if (sb_any_quota_enabled(sb)) {
1021 printk(KERN_ERR
1022 "EXT3-fs: Cannot change journalled "
1023 "quota options when quota turned on.\n");
1024 return 0;
1025 }
1026 qname = match_strdup(&args[0]);
1027 if (!qname) {
1028 printk(KERN_ERR
1029 "EXT3-fs: not enough memory for "
1030 "storing quotafile name.\n");
1031 return 0;
1032 }
1033 if (sbi->s_qf_names[qtype] &&
1034 strcmp(sbi->s_qf_names[qtype], qname)) {
1035 printk(KERN_ERR
1036 "EXT3-fs: %s quota file already "
1037 "specified.\n", QTYPE2NAME(qtype));
1038 kfree(qname);
1039 return 0;
1040 }
1041 sbi->s_qf_names[qtype] = qname;
1042 if (strchr(sbi->s_qf_names[qtype], '/')) {
1043 printk(KERN_ERR
1044 "EXT3-fs: quotafile must be on "
1045 "filesystem root.\n");
1046 kfree(sbi->s_qf_names[qtype]);
1047 sbi->s_qf_names[qtype] = NULL;
1048 return 0;
1049 }
1050 set_opt(sbi->s_mount_opt, QUOTA);
1051 break;
1052 case Opt_offusrjquota:
1053 qtype = USRQUOTA;
1054 goto clear_qf_name;
1055 case Opt_offgrpjquota:
1056 qtype = GRPQUOTA;
1057 clear_qf_name:
1058 if (sb_any_quota_enabled(sb)) {
1059 printk(KERN_ERR "EXT3-fs: Cannot change "
1060 "journalled quota options when "
1061 "quota turned on.\n");
1062 return 0;
1063 }
1064 /*
1065 * The space will be released later when all options
1066 * are confirmed to be correct
1067 */
1068 sbi->s_qf_names[qtype] = NULL;
1069 break;
1070 case Opt_jqfmt_vfsold:
1071 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1072 break;
1073 case Opt_jqfmt_vfsv0:
1074 sbi->s_jquota_fmt = QFMT_VFS_V0;
1075 break;
1076 case Opt_quota:
1077 case Opt_usrquota:
1078 set_opt(sbi->s_mount_opt, QUOTA);
1079 set_opt(sbi->s_mount_opt, USRQUOTA);
1080 break;
1081 case Opt_grpquota:
1082 set_opt(sbi->s_mount_opt, QUOTA);
1083 set_opt(sbi->s_mount_opt, GRPQUOTA);
1084 break;
1085 case Opt_noquota:
1086 if (sb_any_quota_enabled(sb)) {
1087 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1088 "options when quota turned on.\n");
1089 return 0;
1090 }
1091 clear_opt(sbi->s_mount_opt, QUOTA);
1092 clear_opt(sbi->s_mount_opt, USRQUOTA);
1093 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1094 break;
1095 #else
1096 case Opt_quota:
1097 case Opt_usrquota:
1098 case Opt_grpquota:
1099 case Opt_usrjquota:
1100 case Opt_grpjquota:
1101 case Opt_offusrjquota:
1102 case Opt_offgrpjquota:
1103 case Opt_jqfmt_vfsold:
1104 case Opt_jqfmt_vfsv0:
1105 printk(KERN_ERR
1106 "EXT3-fs: journalled quota options not "
1107 "supported.\n");
1108 break;
1109 case Opt_noquota:
1110 break;
1111 #endif
1112 case Opt_abort:
1113 set_opt(sbi->s_mount_opt, ABORT);
1114 break;
1115 case Opt_barrier:
1116 if (match_int(&args[0], &option))
1117 return 0;
1118 if (option)
1119 set_opt(sbi->s_mount_opt, BARRIER);
1120 else
1121 clear_opt(sbi->s_mount_opt, BARRIER);
1122 break;
1123 case Opt_ignore:
1124 break;
1125 case Opt_resize:
1126 if (!is_remount) {
1127 printk("EXT3-fs: resize option only available "
1128 "for remount\n");
1129 return 0;
1130 }
1131 if (match_int(&args[0], &option) != 0)
1132 return 0;
1133 *n_blocks_count = option;
1134 break;
1135 case Opt_nobh:
1136 set_opt(sbi->s_mount_opt, NOBH);
1137 break;
1138 case Opt_bh:
1139 clear_opt(sbi->s_mount_opt, NOBH);
1140 break;
1141 default:
1142 printk (KERN_ERR
1143 "EXT3-fs: Unrecognized mount option \"%s\" "
1144 "or missing value\n", p);
1145 return 0;
1146 }
1147 }
1148 #ifdef CONFIG_QUOTA
1149 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1150 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1151 sbi->s_qf_names[USRQUOTA])
1152 clear_opt(sbi->s_mount_opt, USRQUOTA);
1153
1154 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1155 sbi->s_qf_names[GRPQUOTA])
1156 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1157
1158 if ((sbi->s_qf_names[USRQUOTA] &&
1159 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1160 (sbi->s_qf_names[GRPQUOTA] &&
1161 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1162 printk(KERN_ERR "EXT3-fs: old and new quota "
1163 "format mixing.\n");
1164 return 0;
1165 }
1166
1167 if (!sbi->s_jquota_fmt) {
1168 printk(KERN_ERR "EXT3-fs: journalled quota format "
1169 "not specified.\n");
1170 return 0;
1171 }
1172 } else {
1173 if (sbi->s_jquota_fmt) {
1174 printk(KERN_ERR "EXT3-fs: journalled quota format "
1175 "specified with no journalling "
1176 "enabled.\n");
1177 return 0;
1178 }
1179 }
1180 #endif
1181 return 1;
1182 }
1183
1184 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1185 int read_only)
1186 {
1187 struct ext3_sb_info *sbi = EXT3_SB(sb);
1188 int res = 0;
1189
1190 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1191 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1192 "forcing read-only mode\n");
1193 res = MS_RDONLY;
1194 }
1195 if (read_only)
1196 return res;
1197 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1198 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1199 "running e2fsck is recommended\n");
1200 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1201 printk (KERN_WARNING
1202 "EXT3-fs warning: mounting fs with errors, "
1203 "running e2fsck is recommended\n");
1204 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1205 le16_to_cpu(es->s_mnt_count) >=
1206 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1207 printk (KERN_WARNING
1208 "EXT3-fs warning: maximal mount count reached, "
1209 "running e2fsck is recommended\n");
1210 else if (le32_to_cpu(es->s_checkinterval) &&
1211 (le32_to_cpu(es->s_lastcheck) +
1212 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1213 printk (KERN_WARNING
1214 "EXT3-fs warning: checktime reached, "
1215 "running e2fsck is recommended\n");
1216 #if 0
1217 /* @@@ We _will_ want to clear the valid bit if we find
1218 inconsistencies, to force a fsck at reboot. But for
1219 a plain journaled filesystem we can keep it set as
1220 valid forever! :) */
1221 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1222 #endif
1223 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1224 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1225 le16_add_cpu(&es->s_mnt_count, 1);
1226 es->s_mtime = cpu_to_le32(get_seconds());
1227 ext3_update_dynamic_rev(sb);
1228 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1229
1230 ext3_commit_super(sb, es, 1);
1231 if (test_opt(sb, DEBUG))
1232 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1233 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1234 sb->s_blocksize,
1235 sbi->s_groups_count,
1236 EXT3_BLOCKS_PER_GROUP(sb),
1237 EXT3_INODES_PER_GROUP(sb),
1238 sbi->s_mount_opt);
1239
1240 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1241 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1242 char b[BDEVNAME_SIZE];
1243
1244 printk("external journal on %s\n",
1245 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1246 } else {
1247 printk("internal journal\n");
1248 }
1249 return res;
1250 }
1251
1252 /* Called at mount-time, super-block is locked */
1253 static int ext3_check_descriptors(struct super_block *sb)
1254 {
1255 struct ext3_sb_info *sbi = EXT3_SB(sb);
1256 ext3_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1257 ext3_fsblk_t last_block;
1258 int i;
1259
1260 ext3_debug ("Checking group descriptors");
1261
1262 for (i = 0; i < sbi->s_groups_count; i++) {
1263 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1264
1265 if (i == sbi->s_groups_count - 1)
1266 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1267 else
1268 last_block = first_block +
1269 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1270
1271 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1272 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1273 {
1274 ext3_error (sb, "ext3_check_descriptors",
1275 "Block bitmap for group %d"
1276 " not in group (block %lu)!",
1277 i, (unsigned long)
1278 le32_to_cpu(gdp->bg_block_bitmap));
1279 return 0;
1280 }
1281 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1282 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1283 {
1284 ext3_error (sb, "ext3_check_descriptors",
1285 "Inode bitmap for group %d"
1286 " not in group (block %lu)!",
1287 i, (unsigned long)
1288 le32_to_cpu(gdp->bg_inode_bitmap));
1289 return 0;
1290 }
1291 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1292 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1293 last_block)
1294 {
1295 ext3_error (sb, "ext3_check_descriptors",
1296 "Inode table for group %d"
1297 " not in group (block %lu)!",
1298 i, (unsigned long)
1299 le32_to_cpu(gdp->bg_inode_table));
1300 return 0;
1301 }
1302 first_block += EXT3_BLOCKS_PER_GROUP(sb);
1303 }
1304
1305 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1306 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1307 return 1;
1308 }
1309
1310
1311 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1312 * the superblock) which were deleted from all directories, but held open by
1313 * a process at the time of a crash. We walk the list and try to delete these
1314 * inodes at recovery time (only with a read-write filesystem).
1315 *
1316 * In order to keep the orphan inode chain consistent during traversal (in
1317 * case of crash during recovery), we link each inode into the superblock
1318 * orphan list_head and handle it the same way as an inode deletion during
1319 * normal operation (which journals the operations for us).
1320 *
1321 * We only do an iget() and an iput() on each inode, which is very safe if we
1322 * accidentally point at an in-use or already deleted inode. The worst that
1323 * can happen in this case is that we get a "bit already cleared" message from
1324 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1325 * e2fsck was run on this filesystem, and it must have already done the orphan
1326 * inode cleanup for us, so we can safely abort without any further action.
1327 */
1328 static void ext3_orphan_cleanup (struct super_block * sb,
1329 struct ext3_super_block * es)
1330 {
1331 unsigned int s_flags = sb->s_flags;
1332 int nr_orphans = 0, nr_truncates = 0;
1333 #ifdef CONFIG_QUOTA
1334 int i;
1335 #endif
1336 if (!es->s_last_orphan) {
1337 jbd_debug(4, "no orphan inodes to clean up\n");
1338 return;
1339 }
1340
1341 if (bdev_read_only(sb->s_bdev)) {
1342 printk(KERN_ERR "EXT3-fs: write access "
1343 "unavailable, skipping orphan cleanup.\n");
1344 return;
1345 }
1346
1347 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1348 if (es->s_last_orphan)
1349 jbd_debug(1, "Errors on filesystem, "
1350 "clearing orphan list.\n");
1351 es->s_last_orphan = 0;
1352 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1353 return;
1354 }
1355
1356 if (s_flags & MS_RDONLY) {
1357 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1358 sb->s_id);
1359 sb->s_flags &= ~MS_RDONLY;
1360 }
1361 #ifdef CONFIG_QUOTA
1362 /* Needed for iput() to work correctly and not trash data */
1363 sb->s_flags |= MS_ACTIVE;
1364 /* Turn on quotas so that they are updated correctly */
1365 for (i = 0; i < MAXQUOTAS; i++) {
1366 if (EXT3_SB(sb)->s_qf_names[i]) {
1367 int ret = ext3_quota_on_mount(sb, i);
1368 if (ret < 0)
1369 printk(KERN_ERR
1370 "EXT3-fs: Cannot turn on journalled "
1371 "quota: error %d\n", ret);
1372 }
1373 }
1374 #endif
1375
1376 while (es->s_last_orphan) {
1377 struct inode *inode;
1378
1379 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1380 if (IS_ERR(inode)) {
1381 es->s_last_orphan = 0;
1382 break;
1383 }
1384
1385 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1386 DQUOT_INIT(inode);
1387 if (inode->i_nlink) {
1388 printk(KERN_DEBUG
1389 "%s: truncating inode %lu to %Ld bytes\n",
1390 __FUNCTION__, inode->i_ino, inode->i_size);
1391 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1392 inode->i_ino, inode->i_size);
1393 ext3_truncate(inode);
1394 nr_truncates++;
1395 } else {
1396 printk(KERN_DEBUG
1397 "%s: deleting unreferenced inode %lu\n",
1398 __FUNCTION__, inode->i_ino);
1399 jbd_debug(2, "deleting unreferenced inode %lu\n",
1400 inode->i_ino);
1401 nr_orphans++;
1402 }
1403 iput(inode); /* The delete magic happens here! */
1404 }
1405
1406 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1407
1408 if (nr_orphans)
1409 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1410 sb->s_id, PLURAL(nr_orphans));
1411 if (nr_truncates)
1412 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1413 sb->s_id, PLURAL(nr_truncates));
1414 #ifdef CONFIG_QUOTA
1415 /* Turn quotas off */
1416 for (i = 0; i < MAXQUOTAS; i++) {
1417 if (sb_dqopt(sb)->files[i])
1418 vfs_quota_off(sb, i);
1419 }
1420 #endif
1421 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1422 }
1423
1424 /*
1425 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1426 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1427 * We need to be 1 filesystem block less than the 2^32 sector limit.
1428 */
1429 static loff_t ext3_max_size(int bits)
1430 {
1431 loff_t res = EXT3_NDIR_BLOCKS;
1432 int meta_blocks;
1433 loff_t upper_limit;
1434
1435 /* This is calculated to be the largest file size for a
1436 * dense, file such that the total number of
1437 * sectors in the file, including data and all indirect blocks,
1438 * does not exceed 2^32 -1
1439 * __u32 i_blocks representing the total number of
1440 * 512 bytes blocks of the file
1441 */
1442 upper_limit = (1LL << 32) - 1;
1443
1444 /* total blocks in file system block size */
1445 upper_limit >>= (bits - 9);
1446
1447
1448 /* indirect blocks */
1449 meta_blocks = 1;
1450 /* double indirect blocks */
1451 meta_blocks += 1 + (1LL << (bits-2));
1452 /* tripple indirect blocks */
1453 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1454
1455 upper_limit -= meta_blocks;
1456 upper_limit <<= bits;
1457
1458 res += 1LL << (bits-2);
1459 res += 1LL << (2*(bits-2));
1460 res += 1LL << (3*(bits-2));
1461 res <<= bits;
1462 if (res > upper_limit)
1463 res = upper_limit;
1464
1465 if (res > MAX_LFS_FILESIZE)
1466 res = MAX_LFS_FILESIZE;
1467
1468 return res;
1469 }
1470
1471 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1472 ext3_fsblk_t logic_sb_block,
1473 int nr)
1474 {
1475 struct ext3_sb_info *sbi = EXT3_SB(sb);
1476 unsigned long bg, first_meta_bg;
1477 int has_super = 0;
1478
1479 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1480
1481 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1482 nr < first_meta_bg)
1483 return (logic_sb_block + nr + 1);
1484 bg = sbi->s_desc_per_block * nr;
1485 if (ext3_bg_has_super(sb, bg))
1486 has_super = 1;
1487 return (has_super + ext3_group_first_block_no(sb, bg));
1488 }
1489
1490
1491 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1492 {
1493 struct buffer_head * bh;
1494 struct ext3_super_block *es = NULL;
1495 struct ext3_sb_info *sbi;
1496 ext3_fsblk_t block;
1497 ext3_fsblk_t sb_block = get_sb_block(&data);
1498 ext3_fsblk_t logic_sb_block;
1499 unsigned long offset = 0;
1500 unsigned int journal_inum = 0;
1501 unsigned long journal_devnum = 0;
1502 unsigned long def_mount_opts;
1503 struct inode *root;
1504 int blocksize;
1505 int hblock;
1506 int db_count;
1507 int i;
1508 int needs_recovery;
1509 int ret = -EINVAL;
1510 __le32 features;
1511 int err;
1512
1513 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1514 if (!sbi)
1515 return -ENOMEM;
1516 sb->s_fs_info = sbi;
1517 sbi->s_mount_opt = 0;
1518 sbi->s_resuid = EXT3_DEF_RESUID;
1519 sbi->s_resgid = EXT3_DEF_RESGID;
1520 sbi->s_sb_block = sb_block;
1521
1522 unlock_kernel();
1523
1524 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1525 if (!blocksize) {
1526 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1527 goto out_fail;
1528 }
1529
1530 /*
1531 * The ext3 superblock will not be buffer aligned for other than 1kB
1532 * block sizes. We need to calculate the offset from buffer start.
1533 */
1534 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1535 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1536 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1537 } else {
1538 logic_sb_block = sb_block;
1539 }
1540
1541 if (!(bh = sb_bread(sb, logic_sb_block))) {
1542 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1543 goto out_fail;
1544 }
1545 /*
1546 * Note: s_es must be initialized as soon as possible because
1547 * some ext3 macro-instructions depend on its value
1548 */
1549 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1550 sbi->s_es = es;
1551 sb->s_magic = le16_to_cpu(es->s_magic);
1552 if (sb->s_magic != EXT3_SUPER_MAGIC)
1553 goto cantfind_ext3;
1554
1555 /* Set defaults before we parse the mount options */
1556 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1557 if (def_mount_opts & EXT3_DEFM_DEBUG)
1558 set_opt(sbi->s_mount_opt, DEBUG);
1559 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1560 set_opt(sbi->s_mount_opt, GRPID);
1561 if (def_mount_opts & EXT3_DEFM_UID16)
1562 set_opt(sbi->s_mount_opt, NO_UID32);
1563 #ifdef CONFIG_EXT3_FS_XATTR
1564 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1565 set_opt(sbi->s_mount_opt, XATTR_USER);
1566 #endif
1567 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1568 if (def_mount_opts & EXT3_DEFM_ACL)
1569 set_opt(sbi->s_mount_opt, POSIX_ACL);
1570 #endif
1571 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1572 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1573 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1574 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1575 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1576 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1577
1578 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1579 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1580 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1581 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1582 else
1583 set_opt(sbi->s_mount_opt, ERRORS_RO);
1584
1585 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1586 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1587
1588 set_opt(sbi->s_mount_opt, RESERVATION);
1589
1590 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1591 NULL, 0))
1592 goto failed_mount;
1593
1594 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1595 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1596
1597 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1598 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1599 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1600 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1601 printk(KERN_WARNING
1602 "EXT3-fs warning: feature flags set on rev 0 fs, "
1603 "running e2fsck is recommended\n");
1604 /*
1605 * Check feature flags regardless of the revision level, since we
1606 * previously didn't change the revision level when setting the flags,
1607 * so there is a chance incompat flags are set on a rev 0 filesystem.
1608 */
1609 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1610 if (features) {
1611 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1612 "unsupported optional features (%x).\n",
1613 sb->s_id, le32_to_cpu(features));
1614 goto failed_mount;
1615 }
1616 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1617 if (!(sb->s_flags & MS_RDONLY) && features) {
1618 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1619 "unsupported optional features (%x).\n",
1620 sb->s_id, le32_to_cpu(features));
1621 goto failed_mount;
1622 }
1623 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1624
1625 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1626 blocksize > EXT3_MAX_BLOCK_SIZE) {
1627 printk(KERN_ERR
1628 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1629 blocksize, sb->s_id);
1630 goto failed_mount;
1631 }
1632
1633 hblock = bdev_hardsect_size(sb->s_bdev);
1634 if (sb->s_blocksize != blocksize) {
1635 /*
1636 * Make sure the blocksize for the filesystem is larger
1637 * than the hardware sectorsize for the machine.
1638 */
1639 if (blocksize < hblock) {
1640 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1641 "device blocksize %d.\n", blocksize, hblock);
1642 goto failed_mount;
1643 }
1644
1645 brelse (bh);
1646 if (!sb_set_blocksize(sb, blocksize)) {
1647 printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1648 blocksize);
1649 goto out_fail;
1650 }
1651 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1652 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1653 bh = sb_bread(sb, logic_sb_block);
1654 if (!bh) {
1655 printk(KERN_ERR
1656 "EXT3-fs: Can't read superblock on 2nd try.\n");
1657 goto failed_mount;
1658 }
1659 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1660 sbi->s_es = es;
1661 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1662 printk (KERN_ERR
1663 "EXT3-fs: Magic mismatch, very weird !\n");
1664 goto failed_mount;
1665 }
1666 }
1667
1668 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1669
1670 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1671 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1672 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1673 } else {
1674 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1675 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1676 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1677 (!is_power_of_2(sbi->s_inode_size)) ||
1678 (sbi->s_inode_size > blocksize)) {
1679 printk (KERN_ERR
1680 "EXT3-fs: unsupported inode size: %d\n",
1681 sbi->s_inode_size);
1682 goto failed_mount;
1683 }
1684 }
1685 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1686 le32_to_cpu(es->s_log_frag_size);
1687 if (blocksize != sbi->s_frag_size) {
1688 printk(KERN_ERR
1689 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1690 sbi->s_frag_size, blocksize);
1691 goto failed_mount;
1692 }
1693 sbi->s_frags_per_block = 1;
1694 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1695 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1696 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1697 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1698 goto cantfind_ext3;
1699 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1700 if (sbi->s_inodes_per_block == 0)
1701 goto cantfind_ext3;
1702 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1703 sbi->s_inodes_per_block;
1704 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1705 sbi->s_sbh = bh;
1706 sbi->s_mount_state = le16_to_cpu(es->s_state);
1707 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1708 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1709 for (i=0; i < 4; i++)
1710 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1711 sbi->s_def_hash_version = es->s_def_hash_version;
1712
1713 if (sbi->s_blocks_per_group > blocksize * 8) {
1714 printk (KERN_ERR
1715 "EXT3-fs: #blocks per group too big: %lu\n",
1716 sbi->s_blocks_per_group);
1717 goto failed_mount;
1718 }
1719 if (sbi->s_frags_per_group > blocksize * 8) {
1720 printk (KERN_ERR
1721 "EXT3-fs: #fragments per group too big: %lu\n",
1722 sbi->s_frags_per_group);
1723 goto failed_mount;
1724 }
1725 if (sbi->s_inodes_per_group > blocksize * 8) {
1726 printk (KERN_ERR
1727 "EXT3-fs: #inodes per group too big: %lu\n",
1728 sbi->s_inodes_per_group);
1729 goto failed_mount;
1730 }
1731
1732 if (le32_to_cpu(es->s_blocks_count) >
1733 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1734 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1735 " too large to mount safely\n", sb->s_id);
1736 if (sizeof(sector_t) < 8)
1737 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1738 "enabled\n");
1739 goto failed_mount;
1740 }
1741
1742 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1743 goto cantfind_ext3;
1744 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1745 le32_to_cpu(es->s_first_data_block) - 1)
1746 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1747 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1748 EXT3_DESC_PER_BLOCK(sb);
1749 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1750 GFP_KERNEL);
1751 if (sbi->s_group_desc == NULL) {
1752 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1753 goto failed_mount;
1754 }
1755
1756 bgl_lock_init(&sbi->s_blockgroup_lock);
1757
1758 for (i = 0; i < db_count; i++) {
1759 block = descriptor_loc(sb, logic_sb_block, i);
1760 sbi->s_group_desc[i] = sb_bread(sb, block);
1761 if (!sbi->s_group_desc[i]) {
1762 printk (KERN_ERR "EXT3-fs: "
1763 "can't read group descriptor %d\n", i);
1764 db_count = i;
1765 goto failed_mount2;
1766 }
1767 }
1768 if (!ext3_check_descriptors (sb)) {
1769 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1770 goto failed_mount2;
1771 }
1772 sbi->s_gdb_count = db_count;
1773 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1774 spin_lock_init(&sbi->s_next_gen_lock);
1775
1776 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1777 ext3_count_free_blocks(sb));
1778 if (!err) {
1779 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1780 ext3_count_free_inodes(sb));
1781 }
1782 if (!err) {
1783 err = percpu_counter_init(&sbi->s_dirs_counter,
1784 ext3_count_dirs(sb));
1785 }
1786 if (err) {
1787 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1788 goto failed_mount3;
1789 }
1790
1791 /* per fileystem reservation list head & lock */
1792 spin_lock_init(&sbi->s_rsv_window_lock);
1793 sbi->s_rsv_window_root = RB_ROOT;
1794 /* Add a single, static dummy reservation to the start of the
1795 * reservation window list --- it gives us a placeholder for
1796 * append-at-start-of-list which makes the allocation logic
1797 * _much_ simpler. */
1798 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1799 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1800 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1801 sbi->s_rsv_window_head.rsv_goal_size = 0;
1802 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1803
1804 /*
1805 * set up enough so that it can read an inode
1806 */
1807 sb->s_op = &ext3_sops;
1808 sb->s_export_op = &ext3_export_ops;
1809 sb->s_xattr = ext3_xattr_handlers;
1810 #ifdef CONFIG_QUOTA
1811 sb->s_qcop = &ext3_qctl_operations;
1812 sb->dq_op = &ext3_quota_operations;
1813 #endif
1814 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1815
1816 sb->s_root = NULL;
1817
1818 needs_recovery = (es->s_last_orphan != 0 ||
1819 EXT3_HAS_INCOMPAT_FEATURE(sb,
1820 EXT3_FEATURE_INCOMPAT_RECOVER));
1821
1822 /*
1823 * The first inode we look at is the journal inode. Don't try
1824 * root first: it may be modified in the journal!
1825 */
1826 if (!test_opt(sb, NOLOAD) &&
1827 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1828 if (ext3_load_journal(sb, es, journal_devnum))
1829 goto failed_mount3;
1830 } else if (journal_inum) {
1831 if (ext3_create_journal(sb, es, journal_inum))
1832 goto failed_mount3;
1833 } else {
1834 if (!silent)
1835 printk (KERN_ERR
1836 "ext3: No journal on filesystem on %s\n",
1837 sb->s_id);
1838 goto failed_mount3;
1839 }
1840
1841 /* We have now updated the journal if required, so we can
1842 * validate the data journaling mode. */
1843 switch (test_opt(sb, DATA_FLAGS)) {
1844 case 0:
1845 /* No mode set, assume a default based on the journal
1846 capabilities: ORDERED_DATA if the journal can
1847 cope, else JOURNAL_DATA */
1848 if (journal_check_available_features
1849 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1850 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1851 else
1852 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1853 break;
1854
1855 case EXT3_MOUNT_ORDERED_DATA:
1856 case EXT3_MOUNT_WRITEBACK_DATA:
1857 if (!journal_check_available_features
1858 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1859 printk(KERN_ERR "EXT3-fs: Journal does not support "
1860 "requested data journaling mode\n");
1861 goto failed_mount4;
1862 }
1863 default:
1864 break;
1865 }
1866
1867 if (test_opt(sb, NOBH)) {
1868 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1869 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1870 "its supported only with writeback mode\n");
1871 clear_opt(sbi->s_mount_opt, NOBH);
1872 }
1873 }
1874 /*
1875 * The journal_load will have done any necessary log recovery,
1876 * so we can safely mount the rest of the filesystem now.
1877 */
1878
1879 root = ext3_iget(sb, EXT3_ROOT_INO);
1880 if (IS_ERR(root)) {
1881 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1882 ret = PTR_ERR(root);
1883 goto failed_mount4;
1884 }
1885 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1886 iput(root);
1887 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1888 goto failed_mount4;
1889 }
1890 sb->s_root = d_alloc_root(root);
1891 if (!sb->s_root) {
1892 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1893 iput(root);
1894 ret = -ENOMEM;
1895 goto failed_mount4;
1896 }
1897
1898 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1899 /*
1900 * akpm: core read_super() calls in here with the superblock locked.
1901 * That deadlocks, because orphan cleanup needs to lock the superblock
1902 * in numerous places. Here we just pop the lock - it's relatively
1903 * harmless, because we are now ready to accept write_super() requests,
1904 * and aviro says that's the only reason for hanging onto the
1905 * superblock lock.
1906 */
1907 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1908 ext3_orphan_cleanup(sb, es);
1909 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1910 if (needs_recovery)
1911 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1912 ext3_mark_recovery_complete(sb, es);
1913 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1914 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1915 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1916 "writeback");
1917
1918 lock_kernel();
1919 return 0;
1920
1921 cantfind_ext3:
1922 if (!silent)
1923 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1924 sb->s_id);
1925 goto failed_mount;
1926
1927 failed_mount4:
1928 journal_destroy(sbi->s_journal);
1929 failed_mount3:
1930 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1931 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1932 percpu_counter_destroy(&sbi->s_dirs_counter);
1933 failed_mount2:
1934 for (i = 0; i < db_count; i++)
1935 brelse(sbi->s_group_desc[i]);
1936 kfree(sbi->s_group_desc);
1937 failed_mount:
1938 #ifdef CONFIG_QUOTA
1939 for (i = 0; i < MAXQUOTAS; i++)
1940 kfree(sbi->s_qf_names[i]);
1941 #endif
1942 ext3_blkdev_remove(sbi);
1943 brelse(bh);
1944 out_fail:
1945 sb->s_fs_info = NULL;
1946 kfree(sbi);
1947 lock_kernel();
1948 return ret;
1949 }
1950
1951 /*
1952 * Setup any per-fs journal parameters now. We'll do this both on
1953 * initial mount, once the journal has been initialised but before we've
1954 * done any recovery; and again on any subsequent remount.
1955 */
1956 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1957 {
1958 struct ext3_sb_info *sbi = EXT3_SB(sb);
1959
1960 if (sbi->s_commit_interval)
1961 journal->j_commit_interval = sbi->s_commit_interval;
1962 /* We could also set up an ext3-specific default for the commit
1963 * interval here, but for now we'll just fall back to the jbd
1964 * default. */
1965
1966 spin_lock(&journal->j_state_lock);
1967 if (test_opt(sb, BARRIER))
1968 journal->j_flags |= JFS_BARRIER;
1969 else
1970 journal->j_flags &= ~JFS_BARRIER;
1971 spin_unlock(&journal->j_state_lock);
1972 }
1973
1974 static journal_t *ext3_get_journal(struct super_block *sb,
1975 unsigned int journal_inum)
1976 {
1977 struct inode *journal_inode;
1978 journal_t *journal;
1979
1980 /* First, test for the existence of a valid inode on disk. Bad
1981 * things happen if we iget() an unused inode, as the subsequent
1982 * iput() will try to delete it. */
1983
1984 journal_inode = ext3_iget(sb, journal_inum);
1985 if (IS_ERR(journal_inode)) {
1986 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1987 return NULL;
1988 }
1989 if (!journal_inode->i_nlink) {
1990 make_bad_inode(journal_inode);
1991 iput(journal_inode);
1992 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1993 return NULL;
1994 }
1995
1996 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1997 journal_inode, journal_inode->i_size);
1998 if (!S_ISREG(journal_inode->i_mode)) {
1999 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2000 iput(journal_inode);
2001 return NULL;
2002 }
2003
2004 journal = journal_init_inode(journal_inode);
2005 if (!journal) {
2006 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2007 iput(journal_inode);
2008 return NULL;
2009 }
2010 journal->j_private = sb;
2011 ext3_init_journal_params(sb, journal);
2012 return journal;
2013 }
2014
2015 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2016 dev_t j_dev)
2017 {
2018 struct buffer_head * bh;
2019 journal_t *journal;
2020 ext3_fsblk_t start;
2021 ext3_fsblk_t len;
2022 int hblock, blocksize;
2023 ext3_fsblk_t sb_block;
2024 unsigned long offset;
2025 struct ext3_super_block * es;
2026 struct block_device *bdev;
2027
2028 bdev = ext3_blkdev_get(j_dev);
2029 if (bdev == NULL)
2030 return NULL;
2031
2032 if (bd_claim(bdev, sb)) {
2033 printk(KERN_ERR
2034 "EXT3: failed to claim external journal device.\n");
2035 blkdev_put(bdev);
2036 return NULL;
2037 }
2038
2039 blocksize = sb->s_blocksize;
2040 hblock = bdev_hardsect_size(bdev);
2041 if (blocksize < hblock) {
2042 printk(KERN_ERR
2043 "EXT3-fs: blocksize too small for journal device.\n");
2044 goto out_bdev;
2045 }
2046
2047 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2048 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2049 set_blocksize(bdev, blocksize);
2050 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2051 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2052 "external journal\n");
2053 goto out_bdev;
2054 }
2055
2056 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2057 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2058 !(le32_to_cpu(es->s_feature_incompat) &
2059 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2060 printk(KERN_ERR "EXT3-fs: external journal has "
2061 "bad superblock\n");
2062 brelse(bh);
2063 goto out_bdev;
2064 }
2065
2066 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2067 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2068 brelse(bh);
2069 goto out_bdev;
2070 }
2071
2072 len = le32_to_cpu(es->s_blocks_count);
2073 start = sb_block + 1;
2074 brelse(bh); /* we're done with the superblock */
2075
2076 journal = journal_init_dev(bdev, sb->s_bdev,
2077 start, len, blocksize);
2078 if (!journal) {
2079 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2080 goto out_bdev;
2081 }
2082 journal->j_private = sb;
2083 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2084 wait_on_buffer(journal->j_sb_buffer);
2085 if (!buffer_uptodate(journal->j_sb_buffer)) {
2086 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2087 goto out_journal;
2088 }
2089 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2090 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2091 "user (unsupported) - %d\n",
2092 be32_to_cpu(journal->j_superblock->s_nr_users));
2093 goto out_journal;
2094 }
2095 EXT3_SB(sb)->journal_bdev = bdev;
2096 ext3_init_journal_params(sb, journal);
2097 return journal;
2098 out_journal:
2099 journal_destroy(journal);
2100 out_bdev:
2101 ext3_blkdev_put(bdev);
2102 return NULL;
2103 }
2104
2105 static int ext3_load_journal(struct super_block *sb,
2106 struct ext3_super_block *es,
2107 unsigned long journal_devnum)
2108 {
2109 journal_t *journal;
2110 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2111 dev_t journal_dev;
2112 int err = 0;
2113 int really_read_only;
2114
2115 if (journal_devnum &&
2116 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2117 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2118 "numbers have changed\n");
2119 journal_dev = new_decode_dev(journal_devnum);
2120 } else
2121 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2122
2123 really_read_only = bdev_read_only(sb->s_bdev);
2124
2125 /*
2126 * Are we loading a blank journal or performing recovery after a
2127 * crash? For recovery, we need to check in advance whether we
2128 * can get read-write access to the device.
2129 */
2130
2131 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2132 if (sb->s_flags & MS_RDONLY) {
2133 printk(KERN_INFO "EXT3-fs: INFO: recovery "
2134 "required on readonly filesystem.\n");
2135 if (really_read_only) {
2136 printk(KERN_ERR "EXT3-fs: write access "
2137 "unavailable, cannot proceed.\n");
2138 return -EROFS;
2139 }
2140 printk (KERN_INFO "EXT3-fs: write access will "
2141 "be enabled during recovery.\n");
2142 }
2143 }
2144
2145 if (journal_inum && journal_dev) {
2146 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2147 "and inode journals!\n");
2148 return -EINVAL;
2149 }
2150
2151 if (journal_inum) {
2152 if (!(journal = ext3_get_journal(sb, journal_inum)))
2153 return -EINVAL;
2154 } else {
2155 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2156 return -EINVAL;
2157 }
2158
2159 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2160 err = journal_update_format(journal);
2161 if (err) {
2162 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2163 journal_destroy(journal);
2164 return err;
2165 }
2166 }
2167
2168 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2169 err = journal_wipe(journal, !really_read_only);
2170 if (!err)
2171 err = journal_load(journal);
2172
2173 if (err) {
2174 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2175 journal_destroy(journal);
2176 return err;
2177 }
2178
2179 EXT3_SB(sb)->s_journal = journal;
2180 ext3_clear_journal_err(sb, es);
2181
2182 if (journal_devnum &&
2183 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2184 es->s_journal_dev = cpu_to_le32(journal_devnum);
2185 sb->s_dirt = 1;
2186
2187 /* Make sure we flush the recovery flag to disk. */
2188 ext3_commit_super(sb, es, 1);
2189 }
2190
2191 return 0;
2192 }
2193
2194 static int ext3_create_journal(struct super_block * sb,
2195 struct ext3_super_block * es,
2196 unsigned int journal_inum)
2197 {
2198 journal_t *journal;
2199 int err;
2200
2201 if (sb->s_flags & MS_RDONLY) {
2202 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2203 "create journal.\n");
2204 return -EROFS;
2205 }
2206
2207 journal = ext3_get_journal(sb, journal_inum);
2208 if (!journal)
2209 return -EINVAL;
2210
2211 printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2212 journal_inum);
2213
2214 err = journal_create(journal);
2215 if (err) {
2216 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2217 journal_destroy(journal);
2218 return -EIO;
2219 }
2220
2221 EXT3_SB(sb)->s_journal = journal;
2222
2223 ext3_update_dynamic_rev(sb);
2224 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2225 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2226
2227 es->s_journal_inum = cpu_to_le32(journal_inum);
2228 sb->s_dirt = 1;
2229
2230 /* Make sure we flush the recovery flag to disk. */
2231 ext3_commit_super(sb, es, 1);
2232
2233 return 0;
2234 }
2235
2236 static void ext3_commit_super (struct super_block * sb,
2237 struct ext3_super_block * es,
2238 int sync)
2239 {
2240 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2241
2242 if (!sbh)
2243 return;
2244 es->s_wtime = cpu_to_le32(get_seconds());
2245 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2246 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2247 BUFFER_TRACE(sbh, "marking dirty");
2248 mark_buffer_dirty(sbh);
2249 if (sync)
2250 sync_dirty_buffer(sbh);
2251 }
2252
2253
2254 /*
2255 * Have we just finished recovery? If so, and if we are mounting (or
2256 * remounting) the filesystem readonly, then we will end up with a
2257 * consistent fs on disk. Record that fact.
2258 */
2259 static void ext3_mark_recovery_complete(struct super_block * sb,
2260 struct ext3_super_block * es)
2261 {
2262 journal_t *journal = EXT3_SB(sb)->s_journal;
2263
2264 journal_lock_updates(journal);
2265 journal_flush(journal);
2266 lock_super(sb);
2267 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2268 sb->s_flags & MS_RDONLY) {
2269 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2270 sb->s_dirt = 0;
2271 ext3_commit_super(sb, es, 1);
2272 }
2273 unlock_super(sb);
2274 journal_unlock_updates(journal);
2275 }
2276
2277 /*
2278 * If we are mounting (or read-write remounting) a filesystem whose journal
2279 * has recorded an error from a previous lifetime, move that error to the
2280 * main filesystem now.
2281 */
2282 static void ext3_clear_journal_err(struct super_block * sb,
2283 struct ext3_super_block * es)
2284 {
2285 journal_t *journal;
2286 int j_errno;
2287 const char *errstr;
2288
2289 journal = EXT3_SB(sb)->s_journal;
2290
2291 /*
2292 * Now check for any error status which may have been recorded in the
2293 * journal by a prior ext3_error() or ext3_abort()
2294 */
2295
2296 j_errno = journal_errno(journal);
2297 if (j_errno) {
2298 char nbuf[16];
2299
2300 errstr = ext3_decode_error(sb, j_errno, nbuf);
2301 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2302 "from previous mount: %s", errstr);
2303 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2304 "filesystem check.");
2305
2306 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2307 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2308 ext3_commit_super (sb, es, 1);
2309
2310 journal_clear_err(journal);
2311 }
2312 }
2313
2314 /*
2315 * Force the running and committing transactions to commit,
2316 * and wait on the commit.
2317 */
2318 int ext3_force_commit(struct super_block *sb)
2319 {
2320 journal_t *journal;
2321 int ret;
2322
2323 if (sb->s_flags & MS_RDONLY)
2324 return 0;
2325
2326 journal = EXT3_SB(sb)->s_journal;
2327 sb->s_dirt = 0;
2328 ret = ext3_journal_force_commit(journal);
2329 return ret;
2330 }
2331
2332 /*
2333 * Ext3 always journals updates to the superblock itself, so we don't
2334 * have to propagate any other updates to the superblock on disk at this
2335 * point. Just start an async writeback to get the buffers on their way
2336 * to the disk.
2337 *
2338 * This implicitly triggers the writebehind on sync().
2339 */
2340
2341 static void ext3_write_super (struct super_block * sb)
2342 {
2343 if (mutex_trylock(&sb->s_lock) != 0)
2344 BUG();
2345 sb->s_dirt = 0;
2346 }
2347
2348 static int ext3_sync_fs(struct super_block *sb, int wait)
2349 {
2350 tid_t target;
2351
2352 sb->s_dirt = 0;
2353 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2354 if (wait)
2355 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2356 }
2357 return 0;
2358 }
2359
2360 /*
2361 * LVM calls this function before a (read-only) snapshot is created. This
2362 * gives us a chance to flush the journal completely and mark the fs clean.
2363 */
2364 static void ext3_write_super_lockfs(struct super_block *sb)
2365 {
2366 sb->s_dirt = 0;
2367
2368 if (!(sb->s_flags & MS_RDONLY)) {
2369 journal_t *journal = EXT3_SB(sb)->s_journal;
2370
2371 /* Now we set up the journal barrier. */
2372 journal_lock_updates(journal);
2373 journal_flush(journal);
2374
2375 /* Journal blocked and flushed, clear needs_recovery flag. */
2376 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2377 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2378 }
2379 }
2380
2381 /*
2382 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2383 * flag here, even though the filesystem is not technically dirty yet.
2384 */
2385 static void ext3_unlockfs(struct super_block *sb)
2386 {
2387 if (!(sb->s_flags & MS_RDONLY)) {
2388 lock_super(sb);
2389 /* Reser the needs_recovery flag before the fs is unlocked. */
2390 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2391 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2392 unlock_super(sb);
2393 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2394 }
2395 }
2396
2397 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2398 {
2399 struct ext3_super_block * es;
2400 struct ext3_sb_info *sbi = EXT3_SB(sb);
2401 ext3_fsblk_t n_blocks_count = 0;
2402 unsigned long old_sb_flags;
2403 struct ext3_mount_options old_opts;
2404 int err;
2405 #ifdef CONFIG_QUOTA
2406 int i;
2407 #endif
2408
2409 /* Store the original options */
2410 old_sb_flags = sb->s_flags;
2411 old_opts.s_mount_opt = sbi->s_mount_opt;
2412 old_opts.s_resuid = sbi->s_resuid;
2413 old_opts.s_resgid = sbi->s_resgid;
2414 old_opts.s_commit_interval = sbi->s_commit_interval;
2415 #ifdef CONFIG_QUOTA
2416 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2417 for (i = 0; i < MAXQUOTAS; i++)
2418 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2419 #endif
2420
2421 /*
2422 * Allow the "check" option to be passed as a remount option.
2423 */
2424 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2425 err = -EINVAL;
2426 goto restore_opts;
2427 }
2428
2429 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2430 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2431
2432 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2433 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2434
2435 es = sbi->s_es;
2436
2437 ext3_init_journal_params(sb, sbi->s_journal);
2438
2439 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2440 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2441 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2442 err = -EROFS;
2443 goto restore_opts;
2444 }
2445
2446 if (*flags & MS_RDONLY) {
2447 /*
2448 * First of all, the unconditional stuff we have to do
2449 * to disable replay of the journal when we next remount
2450 */
2451 sb->s_flags |= MS_RDONLY;
2452
2453 /*
2454 * OK, test if we are remounting a valid rw partition
2455 * readonly, and if so set the rdonly flag and then
2456 * mark the partition as valid again.
2457 */
2458 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2459 (sbi->s_mount_state & EXT3_VALID_FS))
2460 es->s_state = cpu_to_le16(sbi->s_mount_state);
2461
2462 /*
2463 * We have to unlock super so that we can wait for
2464 * transactions.
2465 */
2466 unlock_super(sb);
2467 ext3_mark_recovery_complete(sb, es);
2468 lock_super(sb);
2469 } else {
2470 __le32 ret;
2471 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2472 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2473 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2474 "remount RDWR because of unsupported "
2475 "optional features (%x).\n",
2476 sb->s_id, le32_to_cpu(ret));
2477 err = -EROFS;
2478 goto restore_opts;
2479 }
2480
2481 /*
2482 * If we have an unprocessed orphan list hanging
2483 * around from a previously readonly bdev mount,
2484 * require a full umount/remount for now.
2485 */
2486 if (es->s_last_orphan) {
2487 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2488 "remount RDWR because of unprocessed "
2489 "orphan inode list. Please "
2490 "umount/remount instead.\n",
2491 sb->s_id);
2492 err = -EINVAL;
2493 goto restore_opts;
2494 }
2495
2496 /*
2497 * Mounting a RDONLY partition read-write, so reread
2498 * and store the current valid flag. (It may have
2499 * been changed by e2fsck since we originally mounted
2500 * the partition.)
2501 */
2502 ext3_clear_journal_err(sb, es);
2503 sbi->s_mount_state = le16_to_cpu(es->s_state);
2504 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2505 goto restore_opts;
2506 if (!ext3_setup_super (sb, es, 0))
2507 sb->s_flags &= ~MS_RDONLY;
2508 }
2509 }
2510 #ifdef CONFIG_QUOTA
2511 /* Release old quota file names */
2512 for (i = 0; i < MAXQUOTAS; i++)
2513 if (old_opts.s_qf_names[i] &&
2514 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2515 kfree(old_opts.s_qf_names[i]);
2516 #endif
2517 return 0;
2518 restore_opts:
2519 sb->s_flags = old_sb_flags;
2520 sbi->s_mount_opt = old_opts.s_mount_opt;
2521 sbi->s_resuid = old_opts.s_resuid;
2522 sbi->s_resgid = old_opts.s_resgid;
2523 sbi->s_commit_interval = old_opts.s_commit_interval;
2524 #ifdef CONFIG_QUOTA
2525 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2526 for (i = 0; i < MAXQUOTAS; i++) {
2527 if (sbi->s_qf_names[i] &&
2528 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2529 kfree(sbi->s_qf_names[i]);
2530 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2531 }
2532 #endif
2533 return err;
2534 }
2535
2536 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2537 {
2538 struct super_block *sb = dentry->d_sb;
2539 struct ext3_sb_info *sbi = EXT3_SB(sb);
2540 struct ext3_super_block *es = sbi->s_es;
2541 u64 fsid;
2542
2543 if (test_opt(sb, MINIX_DF)) {
2544 sbi->s_overhead_last = 0;
2545 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2546 unsigned long ngroups = sbi->s_groups_count, i;
2547 ext3_fsblk_t overhead = 0;
2548 smp_rmb();
2549
2550 /*
2551 * Compute the overhead (FS structures). This is constant
2552 * for a given filesystem unless the number of block groups
2553 * changes so we cache the previous value until it does.
2554 */
2555
2556 /*
2557 * All of the blocks before first_data_block are
2558 * overhead
2559 */
2560 overhead = le32_to_cpu(es->s_first_data_block);
2561
2562 /*
2563 * Add the overhead attributed to the superblock and
2564 * block group descriptors. If the sparse superblocks
2565 * feature is turned on, then not all groups have this.
2566 */
2567 for (i = 0; i < ngroups; i++) {
2568 overhead += ext3_bg_has_super(sb, i) +
2569 ext3_bg_num_gdb(sb, i);
2570 cond_resched();
2571 }
2572
2573 /*
2574 * Every block group has an inode bitmap, a block
2575 * bitmap, and an inode table.
2576 */
2577 overhead += ngroups * (2 + sbi->s_itb_per_group);
2578 sbi->s_overhead_last = overhead;
2579 smp_wmb();
2580 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2581 }
2582
2583 buf->f_type = EXT3_SUPER_MAGIC;
2584 buf->f_bsize = sb->s_blocksize;
2585 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2586 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2587 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2588 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2589 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2590 buf->f_bavail = 0;
2591 buf->f_files = le32_to_cpu(es->s_inodes_count);
2592 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2593 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2594 buf->f_namelen = EXT3_NAME_LEN;
2595 fsid = le64_to_cpup((void *)es->s_uuid) ^
2596 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2597 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2598 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2599 return 0;
2600 }
2601
2602 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2603 * is locked for write. Otherwise the are possible deadlocks:
2604 * Process 1 Process 2
2605 * ext3_create() quota_sync()
2606 * journal_start() write_dquot()
2607 * DQUOT_INIT() down(dqio_mutex)
2608 * down(dqio_mutex) journal_start()
2609 *
2610 */
2611
2612 #ifdef CONFIG_QUOTA
2613
2614 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2615 {
2616 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2617 }
2618
2619 static int ext3_dquot_initialize(struct inode *inode, int type)
2620 {
2621 handle_t *handle;
2622 int ret, err;
2623
2624 /* We may create quota structure so we need to reserve enough blocks */
2625 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2626 if (IS_ERR(handle))
2627 return PTR_ERR(handle);
2628 ret = dquot_initialize(inode, type);
2629 err = ext3_journal_stop(handle);
2630 if (!ret)
2631 ret = err;
2632 return ret;
2633 }
2634
2635 static int ext3_dquot_drop(struct inode *inode)
2636 {
2637 handle_t *handle;
2638 int ret, err;
2639
2640 /* We may delete quota structure so we need to reserve enough blocks */
2641 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2642 if (IS_ERR(handle))
2643 return PTR_ERR(handle);
2644 ret = dquot_drop(inode);
2645 err = ext3_journal_stop(handle);
2646 if (!ret)
2647 ret = err;
2648 return ret;
2649 }
2650
2651 static int ext3_write_dquot(struct dquot *dquot)
2652 {
2653 int ret, err;
2654 handle_t *handle;
2655 struct inode *inode;
2656
2657 inode = dquot_to_inode(dquot);
2658 handle = ext3_journal_start(inode,
2659 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2660 if (IS_ERR(handle))
2661 return PTR_ERR(handle);
2662 ret = dquot_commit(dquot);
2663 err = ext3_journal_stop(handle);
2664 if (!ret)
2665 ret = err;
2666 return ret;
2667 }
2668
2669 static int ext3_acquire_dquot(struct dquot *dquot)
2670 {
2671 int ret, err;
2672 handle_t *handle;
2673
2674 handle = ext3_journal_start(dquot_to_inode(dquot),
2675 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2676 if (IS_ERR(handle))
2677 return PTR_ERR(handle);
2678 ret = dquot_acquire(dquot);
2679 err = ext3_journal_stop(handle);
2680 if (!ret)
2681 ret = err;
2682 return ret;
2683 }
2684
2685 static int ext3_release_dquot(struct dquot *dquot)
2686 {
2687 int ret, err;
2688 handle_t *handle;
2689
2690 handle = ext3_journal_start(dquot_to_inode(dquot),
2691 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2692 if (IS_ERR(handle)) {
2693 /* Release dquot anyway to avoid endless cycle in dqput() */
2694 dquot_release(dquot);
2695 return PTR_ERR(handle);
2696 }
2697 ret = dquot_release(dquot);
2698 err = ext3_journal_stop(handle);
2699 if (!ret)
2700 ret = err;
2701 return ret;
2702 }
2703
2704 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2705 {
2706 /* Are we journalling quotas? */
2707 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2708 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2709 dquot_mark_dquot_dirty(dquot);
2710 return ext3_write_dquot(dquot);
2711 } else {
2712 return dquot_mark_dquot_dirty(dquot);
2713 }
2714 }
2715
2716 static int ext3_write_info(struct super_block *sb, int type)
2717 {
2718 int ret, err;
2719 handle_t *handle;
2720
2721 /* Data block + inode block */
2722 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2723 if (IS_ERR(handle))
2724 return PTR_ERR(handle);
2725 ret = dquot_commit_info(sb, type);
2726 err = ext3_journal_stop(handle);
2727 if (!ret)
2728 ret = err;
2729 return ret;
2730 }
2731
2732 /*
2733 * Turn on quotas during mount time - we need to find
2734 * the quota file and such...
2735 */
2736 static int ext3_quota_on_mount(struct super_block *sb, int type)
2737 {
2738 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2739 EXT3_SB(sb)->s_jquota_fmt, type);
2740 }
2741
2742 /*
2743 * Standard function to be called on quota_on
2744 */
2745 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2746 char *path)
2747 {
2748 int err;
2749 struct nameidata nd;
2750
2751 if (!test_opt(sb, QUOTA))
2752 return -EINVAL;
2753 /* Not journalling quota? */
2754 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2755 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2756 return vfs_quota_on(sb, type, format_id, path);
2757 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2758 if (err)
2759 return err;
2760 /* Quotafile not on the same filesystem? */
2761 if (nd.path.mnt->mnt_sb != sb) {
2762 path_put(&nd.path);
2763 return -EXDEV;
2764 }
2765 /* Quotafile not of fs root? */
2766 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
2767 printk(KERN_WARNING
2768 "EXT3-fs: Quota file not on filesystem root. "
2769 "Journalled quota will not work.\n");
2770 path_put(&nd.path);
2771 return vfs_quota_on(sb, type, format_id, path);
2772 }
2773
2774 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2775 * acquiring the locks... As quota files are never truncated and quota code
2776 * itself serializes the operations (and noone else should touch the files)
2777 * we don't have to be afraid of races */
2778 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2779 size_t len, loff_t off)
2780 {
2781 struct inode *inode = sb_dqopt(sb)->files[type];
2782 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2783 int err = 0;
2784 int offset = off & (sb->s_blocksize - 1);
2785 int tocopy;
2786 size_t toread;
2787 struct buffer_head *bh;
2788 loff_t i_size = i_size_read(inode);
2789
2790 if (off > i_size)
2791 return 0;
2792 if (off+len > i_size)
2793 len = i_size-off;
2794 toread = len;
2795 while (toread > 0) {
2796 tocopy = sb->s_blocksize - offset < toread ?
2797 sb->s_blocksize - offset : toread;
2798 bh = ext3_bread(NULL, inode, blk, 0, &err);
2799 if (err)
2800 return err;
2801 if (!bh) /* A hole? */
2802 memset(data, 0, tocopy);
2803 else
2804 memcpy(data, bh->b_data+offset, tocopy);
2805 brelse(bh);
2806 offset = 0;
2807 toread -= tocopy;
2808 data += tocopy;
2809 blk++;
2810 }
2811 return len;
2812 }
2813
2814 /* Write to quotafile (we know the transaction is already started and has
2815 * enough credits) */
2816 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2817 const char *data, size_t len, loff_t off)
2818 {
2819 struct inode *inode = sb_dqopt(sb)->files[type];
2820 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2821 int err = 0;
2822 int offset = off & (sb->s_blocksize - 1);
2823 int tocopy;
2824 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2825 size_t towrite = len;
2826 struct buffer_head *bh;
2827 handle_t *handle = journal_current_handle();
2828
2829 if (!handle) {
2830 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2831 " cancelled because transaction is not started.\n",
2832 (unsigned long long)off, (unsigned long long)len);
2833 return -EIO;
2834 }
2835 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2836 while (towrite > 0) {
2837 tocopy = sb->s_blocksize - offset < towrite ?
2838 sb->s_blocksize - offset : towrite;
2839 bh = ext3_bread(handle, inode, blk, 1, &err);
2840 if (!bh)
2841 goto out;
2842 if (journal_quota) {
2843 err = ext3_journal_get_write_access(handle, bh);
2844 if (err) {
2845 brelse(bh);
2846 goto out;
2847 }
2848 }
2849 lock_buffer(bh);
2850 memcpy(bh->b_data+offset, data, tocopy);
2851 flush_dcache_page(bh->b_page);
2852 unlock_buffer(bh);
2853 if (journal_quota)
2854 err = ext3_journal_dirty_metadata(handle, bh);
2855 else {
2856 /* Always do at least ordered writes for quotas */
2857 err = ext3_journal_dirty_data(handle, bh);
2858 mark_buffer_dirty(bh);
2859 }
2860 brelse(bh);
2861 if (err)
2862 goto out;
2863 offset = 0;
2864 towrite -= tocopy;
2865 data += tocopy;
2866 blk++;
2867 }
2868 out:
2869 if (len == towrite)
2870 return err;
2871 if (inode->i_size < off+len-towrite) {
2872 i_size_write(inode, off+len-towrite);
2873 EXT3_I(inode)->i_disksize = inode->i_size;
2874 }
2875 inode->i_version++;
2876 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2877 ext3_mark_inode_dirty(handle, inode);
2878 mutex_unlock(&inode->i_mutex);
2879 return len - towrite;
2880 }
2881
2882 #endif
2883
2884 static int ext3_get_sb(struct file_system_type *fs_type,
2885 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2886 {
2887 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2888 }
2889
2890 static struct file_system_type ext3_fs_type = {
2891 .owner = THIS_MODULE,
2892 .name = "ext3",
2893 .get_sb = ext3_get_sb,
2894 .kill_sb = kill_block_super,
2895 .fs_flags = FS_REQUIRES_DEV,
2896 };
2897
2898 static int __init init_ext3_fs(void)
2899 {
2900 int err = init_ext3_xattr();
2901 if (err)
2902 return err;
2903 err = init_inodecache();
2904 if (err)
2905 goto out1;
2906 err = register_filesystem(&ext3_fs_type);
2907 if (err)
2908 goto out;
2909 return 0;
2910 out:
2911 destroy_inodecache();
2912 out1:
2913 exit_ext3_xattr();
2914 return err;
2915 }
2916
2917 static void __exit exit_ext3_fs(void)
2918 {
2919 unregister_filesystem(&ext3_fs_type);
2920 destroy_inodecache();
2921 exit_ext3_xattr();
2922 }
2923
2924 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2925 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2926 MODULE_LICENSE("GPL");
2927 module_init(init_ext3_fs)
2928 module_exit(exit_ext3_fs)
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