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i386: hard_{en,dis}able_TSC can be static
[linux-2.6/mini2440.git] / fs / ext3 / super.c
blobf3675cc630e97a7c5ab42251193050872957c5c1
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_CONT)) {
579 int def_errors = le16_to_cpu(es->s_errors);
580
581 if (def_errors == EXT3_ERRORS_PANIC ||
582 def_errors == EXT3_ERRORS_RO) {
583 seq_puts(seq, ",errors=continue");
584 }
585 }
586 if (test_opt(sb, ERRORS_RO))
587 seq_puts(seq, ",errors=remount-ro");
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 = iget(sb, ino);
653 if (inode == NULL)
654 return ERR_PTR(-ENOMEM);
655 if (is_bad_inode(inode) ||
656 (generation && inode->i_generation != generation)) {
657 iput(inode);
658 return ERR_PTR(-ESTALE);
659 }
660
661 return inode;
662 }
663
664 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
665 int fh_len, int fh_type)
666 {
667 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
668 ext3_nfs_get_inode);
669 }
670
671 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
672 int fh_len, int fh_type)
673 {
674 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
675 ext3_nfs_get_inode);
676 }
677
678 #ifdef CONFIG_QUOTA
679 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
680 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
681
682 static int ext3_dquot_initialize(struct inode *inode, int type);
683 static int ext3_dquot_drop(struct inode *inode);
684 static int ext3_write_dquot(struct dquot *dquot);
685 static int ext3_acquire_dquot(struct dquot *dquot);
686 static int ext3_release_dquot(struct dquot *dquot);
687 static int ext3_mark_dquot_dirty(struct dquot *dquot);
688 static int ext3_write_info(struct super_block *sb, int type);
689 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
690 static int ext3_quota_on_mount(struct super_block *sb, int type);
691 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
692 size_t len, loff_t off);
693 static ssize_t ext3_quota_write(struct super_block *sb, int type,
694 const char *data, size_t len, loff_t off);
695
696 static struct dquot_operations ext3_quota_operations = {
697 .initialize = ext3_dquot_initialize,
698 .drop = ext3_dquot_drop,
699 .alloc_space = dquot_alloc_space,
700 .alloc_inode = dquot_alloc_inode,
701 .free_space = dquot_free_space,
702 .free_inode = dquot_free_inode,
703 .transfer = dquot_transfer,
704 .write_dquot = ext3_write_dquot,
705 .acquire_dquot = ext3_acquire_dquot,
706 .release_dquot = ext3_release_dquot,
707 .mark_dirty = ext3_mark_dquot_dirty,
708 .write_info = ext3_write_info
709 };
710
711 static struct quotactl_ops ext3_qctl_operations = {
712 .quota_on = ext3_quota_on,
713 .quota_off = vfs_quota_off,
714 .quota_sync = vfs_quota_sync,
715 .get_info = vfs_get_dqinfo,
716 .set_info = vfs_set_dqinfo,
717 .get_dqblk = vfs_get_dqblk,
718 .set_dqblk = vfs_set_dqblk
719 };
720 #endif
721
722 static const struct super_operations ext3_sops = {
723 .alloc_inode = ext3_alloc_inode,
724 .destroy_inode = ext3_destroy_inode,
725 .read_inode = ext3_read_inode,
726 .write_inode = ext3_write_inode,
727 .dirty_inode = ext3_dirty_inode,
728 .delete_inode = ext3_delete_inode,
729 .put_super = ext3_put_super,
730 .write_super = ext3_write_super,
731 .sync_fs = ext3_sync_fs,
732 .write_super_lockfs = ext3_write_super_lockfs,
733 .unlockfs = ext3_unlockfs,
734 .statfs = ext3_statfs,
735 .remount_fs = ext3_remount,
736 .clear_inode = ext3_clear_inode,
737 .show_options = ext3_show_options,
738 #ifdef CONFIG_QUOTA
739 .quota_read = ext3_quota_read,
740 .quota_write = ext3_quota_write,
741 #endif
742 };
743
744 static const struct export_operations ext3_export_ops = {
745 .fh_to_dentry = ext3_fh_to_dentry,
746 .fh_to_parent = ext3_fh_to_parent,
747 .get_parent = ext3_get_parent,
748 };
749
750 enum {
751 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
752 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
753 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
754 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
755 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
756 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
757 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
758 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
759 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
760 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
761 Opt_grpquota
762 };
763
764 static match_table_t tokens = {
765 {Opt_bsd_df, "bsddf"},
766 {Opt_minix_df, "minixdf"},
767 {Opt_grpid, "grpid"},
768 {Opt_grpid, "bsdgroups"},
769 {Opt_nogrpid, "nogrpid"},
770 {Opt_nogrpid, "sysvgroups"},
771 {Opt_resgid, "resgid=%u"},
772 {Opt_resuid, "resuid=%u"},
773 {Opt_sb, "sb=%u"},
774 {Opt_err_cont, "errors=continue"},
775 {Opt_err_panic, "errors=panic"},
776 {Opt_err_ro, "errors=remount-ro"},
777 {Opt_nouid32, "nouid32"},
778 {Opt_nocheck, "nocheck"},
779 {Opt_nocheck, "check=none"},
780 {Opt_debug, "debug"},
781 {Opt_oldalloc, "oldalloc"},
782 {Opt_orlov, "orlov"},
783 {Opt_user_xattr, "user_xattr"},
784 {Opt_nouser_xattr, "nouser_xattr"},
785 {Opt_acl, "acl"},
786 {Opt_noacl, "noacl"},
787 {Opt_reservation, "reservation"},
788 {Opt_noreservation, "noreservation"},
789 {Opt_noload, "noload"},
790 {Opt_nobh, "nobh"},
791 {Opt_bh, "bh"},
792 {Opt_commit, "commit=%u"},
793 {Opt_journal_update, "journal=update"},
794 {Opt_journal_inum, "journal=%u"},
795 {Opt_journal_dev, "journal_dev=%u"},
796 {Opt_abort, "abort"},
797 {Opt_data_journal, "data=journal"},
798 {Opt_data_ordered, "data=ordered"},
799 {Opt_data_writeback, "data=writeback"},
800 {Opt_offusrjquota, "usrjquota="},
801 {Opt_usrjquota, "usrjquota=%s"},
802 {Opt_offgrpjquota, "grpjquota="},
803 {Opt_grpjquota, "grpjquota=%s"},
804 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
805 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
806 {Opt_grpquota, "grpquota"},
807 {Opt_noquota, "noquota"},
808 {Opt_quota, "quota"},
809 {Opt_usrquota, "usrquota"},
810 {Opt_barrier, "barrier=%u"},
811 {Opt_err, NULL},
812 {Opt_resize, "resize"},
813 };
814
815 static ext3_fsblk_t get_sb_block(void **data)
816 {
817 ext3_fsblk_t sb_block;
818 char *options = (char *) *data;
819
820 if (!options || strncmp(options, "sb=", 3) != 0)
821 return 1; /* Default location */
822 options += 3;
823 /*todo: use simple_strtoll with >32bit ext3 */
824 sb_block = simple_strtoul(options, &options, 0);
825 if (*options && *options != ',') {
826 printk("EXT3-fs: Invalid sb specification: %s\n",
827 (char *) *data);
828 return 1;
829 }
830 if (*options == ',')
831 options++;
832 *data = (void *) options;
833 return sb_block;
834 }
835
836 static int parse_options (char *options, struct super_block *sb,
837 unsigned int *inum, unsigned long *journal_devnum,
838 ext3_fsblk_t *n_blocks_count, int is_remount)
839 {
840 struct ext3_sb_info *sbi = EXT3_SB(sb);
841 char * p;
842 substring_t args[MAX_OPT_ARGS];
843 int data_opt = 0;
844 int option;
845 #ifdef CONFIG_QUOTA
846 int qtype;
847 char *qname;
848 #endif
849
850 if (!options)
851 return 1;
852
853 while ((p = strsep (&options, ",")) != NULL) {
854 int token;
855 if (!*p)
856 continue;
857
858 token = match_token(p, tokens, args);
859 switch (token) {
860 case Opt_bsd_df:
861 clear_opt (sbi->s_mount_opt, MINIX_DF);
862 break;
863 case Opt_minix_df:
864 set_opt (sbi->s_mount_opt, MINIX_DF);
865 break;
866 case Opt_grpid:
867 set_opt (sbi->s_mount_opt, GRPID);
868 break;
869 case Opt_nogrpid:
870 clear_opt (sbi->s_mount_opt, GRPID);
871 break;
872 case Opt_resuid:
873 if (match_int(&args[0], &option))
874 return 0;
875 sbi->s_resuid = option;
876 break;
877 case Opt_resgid:
878 if (match_int(&args[0], &option))
879 return 0;
880 sbi->s_resgid = option;
881 break;
882 case Opt_sb:
883 /* handled by get_sb_block() instead of here */
884 /* *sb_block = match_int(&args[0]); */
885 break;
886 case Opt_err_panic:
887 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
888 clear_opt (sbi->s_mount_opt, ERRORS_RO);
889 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
890 break;
891 case Opt_err_ro:
892 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
893 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
894 set_opt (sbi->s_mount_opt, ERRORS_RO);
895 break;
896 case Opt_err_cont:
897 clear_opt (sbi->s_mount_opt, ERRORS_RO);
898 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
899 set_opt (sbi->s_mount_opt, ERRORS_CONT);
900 break;
901 case Opt_nouid32:
902 set_opt (sbi->s_mount_opt, NO_UID32);
903 break;
904 case Opt_nocheck:
905 clear_opt (sbi->s_mount_opt, CHECK);
906 break;
907 case Opt_debug:
908 set_opt (sbi->s_mount_opt, DEBUG);
909 break;
910 case Opt_oldalloc:
911 set_opt (sbi->s_mount_opt, OLDALLOC);
912 break;
913 case Opt_orlov:
914 clear_opt (sbi->s_mount_opt, OLDALLOC);
915 break;
916 #ifdef CONFIG_EXT3_FS_XATTR
917 case Opt_user_xattr:
918 set_opt (sbi->s_mount_opt, XATTR_USER);
919 break;
920 case Opt_nouser_xattr:
921 clear_opt (sbi->s_mount_opt, XATTR_USER);
922 break;
923 #else
924 case Opt_user_xattr:
925 case Opt_nouser_xattr:
926 printk("EXT3 (no)user_xattr options not supported\n");
927 break;
928 #endif
929 #ifdef CONFIG_EXT3_FS_POSIX_ACL
930 case Opt_acl:
931 set_opt(sbi->s_mount_opt, POSIX_ACL);
932 break;
933 case Opt_noacl:
934 clear_opt(sbi->s_mount_opt, POSIX_ACL);
935 break;
936 #else
937 case Opt_acl:
938 case Opt_noacl:
939 printk("EXT3 (no)acl options not supported\n");
940 break;
941 #endif
942 case Opt_reservation:
943 set_opt(sbi->s_mount_opt, RESERVATION);
944 break;
945 case Opt_noreservation:
946 clear_opt(sbi->s_mount_opt, RESERVATION);
947 break;
948 case Opt_journal_update:
949 /* @@@ FIXME */
950 /* Eventually we will want to be able to create
951 a journal file here. For now, only allow the
952 user to specify an existing inode to be the
953 journal file. */
954 if (is_remount) {
955 printk(KERN_ERR "EXT3-fs: cannot specify "
956 "journal on remount\n");
957 return 0;
958 }
959 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
960 break;
961 case Opt_journal_inum:
962 if (is_remount) {
963 printk(KERN_ERR "EXT3-fs: cannot specify "
964 "journal on remount\n");
965 return 0;
966 }
967 if (match_int(&args[0], &option))
968 return 0;
969 *inum = option;
970 break;
971 case Opt_journal_dev:
972 if (is_remount) {
973 printk(KERN_ERR "EXT3-fs: cannot specify "
974 "journal on remount\n");
975 return 0;
976 }
977 if (match_int(&args[0], &option))
978 return 0;
979 *journal_devnum = option;
980 break;
981 case Opt_noload:
982 set_opt (sbi->s_mount_opt, NOLOAD);
983 break;
984 case Opt_commit:
985 if (match_int(&args[0], &option))
986 return 0;
987 if (option < 0)
988 return 0;
989 if (option == 0)
990 option = JBD_DEFAULT_MAX_COMMIT_AGE;
991 sbi->s_commit_interval = HZ * option;
992 break;
993 case Opt_data_journal:
994 data_opt = EXT3_MOUNT_JOURNAL_DATA;
995 goto datacheck;
996 case Opt_data_ordered:
997 data_opt = EXT3_MOUNT_ORDERED_DATA;
998 goto datacheck;
999 case Opt_data_writeback:
1000 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1001 datacheck:
1002 if (is_remount) {
1003 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1004 != data_opt) {
1005 printk(KERN_ERR
1006 "EXT3-fs: cannot change data "
1007 "mode on remount\n");
1008 return 0;
1009 }
1010 } else {
1011 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1012 sbi->s_mount_opt |= data_opt;
1013 }
1014 break;
1015 #ifdef CONFIG_QUOTA
1016 case Opt_usrjquota:
1017 qtype = USRQUOTA;
1018 goto set_qf_name;
1019 case Opt_grpjquota:
1020 qtype = GRPQUOTA;
1021 set_qf_name:
1022 if (sb_any_quota_enabled(sb)) {
1023 printk(KERN_ERR
1024 "EXT3-fs: Cannot change journalled "
1025 "quota options when quota turned on.\n");
1026 return 0;
1027 }
1028 qname = match_strdup(&args[0]);
1029 if (!qname) {
1030 printk(KERN_ERR
1031 "EXT3-fs: not enough memory for "
1032 "storing quotafile name.\n");
1033 return 0;
1034 }
1035 if (sbi->s_qf_names[qtype] &&
1036 strcmp(sbi->s_qf_names[qtype], qname)) {
1037 printk(KERN_ERR
1038 "EXT3-fs: %s quota file already "
1039 "specified.\n", QTYPE2NAME(qtype));
1040 kfree(qname);
1041 return 0;
1042 }
1043 sbi->s_qf_names[qtype] = qname;
1044 if (strchr(sbi->s_qf_names[qtype], '/')) {
1045 printk(KERN_ERR
1046 "EXT3-fs: quotafile must be on "
1047 "filesystem root.\n");
1048 kfree(sbi->s_qf_names[qtype]);
1049 sbi->s_qf_names[qtype] = NULL;
1050 return 0;
1051 }
1052 set_opt(sbi->s_mount_opt, QUOTA);
1053 break;
1054 case Opt_offusrjquota:
1055 qtype = USRQUOTA;
1056 goto clear_qf_name;
1057 case Opt_offgrpjquota:
1058 qtype = GRPQUOTA;
1059 clear_qf_name:
1060 if (sb_any_quota_enabled(sb)) {
1061 printk(KERN_ERR "EXT3-fs: Cannot change "
1062 "journalled quota options when "
1063 "quota turned on.\n");
1064 return 0;
1065 }
1066 /*
1067 * The space will be released later when all options
1068 * are confirmed to be correct
1069 */
1070 sbi->s_qf_names[qtype] = NULL;
1071 break;
1072 case Opt_jqfmt_vfsold:
1073 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1074 break;
1075 case Opt_jqfmt_vfsv0:
1076 sbi->s_jquota_fmt = QFMT_VFS_V0;
1077 break;
1078 case Opt_quota:
1079 case Opt_usrquota:
1080 set_opt(sbi->s_mount_opt, QUOTA);
1081 set_opt(sbi->s_mount_opt, USRQUOTA);
1082 break;
1083 case Opt_grpquota:
1084 set_opt(sbi->s_mount_opt, QUOTA);
1085 set_opt(sbi->s_mount_opt, GRPQUOTA);
1086 break;
1087 case Opt_noquota:
1088 if (sb_any_quota_enabled(sb)) {
1089 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1090 "options when quota turned on.\n");
1091 return 0;
1092 }
1093 clear_opt(sbi->s_mount_opt, QUOTA);
1094 clear_opt(sbi->s_mount_opt, USRQUOTA);
1095 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1096 break;
1097 #else
1098 case Opt_quota:
1099 case Opt_usrquota:
1100 case Opt_grpquota:
1101 case Opt_usrjquota:
1102 case Opt_grpjquota:
1103 case Opt_offusrjquota:
1104 case Opt_offgrpjquota:
1105 case Opt_jqfmt_vfsold:
1106 case Opt_jqfmt_vfsv0:
1107 printk(KERN_ERR
1108 "EXT3-fs: journalled quota options not "
1109 "supported.\n");
1110 break;
1111 case Opt_noquota:
1112 break;
1113 #endif
1114 case Opt_abort:
1115 set_opt(sbi->s_mount_opt, ABORT);
1116 break;
1117 case Opt_barrier:
1118 if (match_int(&args[0], &option))
1119 return 0;
1120 if (option)
1121 set_opt(sbi->s_mount_opt, BARRIER);
1122 else
1123 clear_opt(sbi->s_mount_opt, BARRIER);
1124 break;
1125 case Opt_ignore:
1126 break;
1127 case Opt_resize:
1128 if (!is_remount) {
1129 printk("EXT3-fs: resize option only available "
1130 "for remount\n");
1131 return 0;
1132 }
1133 if (match_int(&args[0], &option) != 0)
1134 return 0;
1135 *n_blocks_count = option;
1136 break;
1137 case Opt_nobh:
1138 set_opt(sbi->s_mount_opt, NOBH);
1139 break;
1140 case Opt_bh:
1141 clear_opt(sbi->s_mount_opt, NOBH);
1142 break;
1143 default:
1144 printk (KERN_ERR
1145 "EXT3-fs: Unrecognized mount option \"%s\" "
1146 "or missing value\n", p);
1147 return 0;
1148 }
1149 }
1150 #ifdef CONFIG_QUOTA
1151 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1152 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1153 sbi->s_qf_names[USRQUOTA])
1154 clear_opt(sbi->s_mount_opt, USRQUOTA);
1155
1156 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1157 sbi->s_qf_names[GRPQUOTA])
1158 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1159
1160 if ((sbi->s_qf_names[USRQUOTA] &&
1161 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1162 (sbi->s_qf_names[GRPQUOTA] &&
1163 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1164 printk(KERN_ERR "EXT3-fs: old and new quota "
1165 "format mixing.\n");
1166 return 0;
1167 }
1168
1169 if (!sbi->s_jquota_fmt) {
1170 printk(KERN_ERR "EXT3-fs: journalled quota format "
1171 "not specified.\n");
1172 return 0;
1173 }
1174 } else {
1175 if (sbi->s_jquota_fmt) {
1176 printk(KERN_ERR "EXT3-fs: journalled quota format "
1177 "specified with no journalling "
1178 "enabled.\n");
1179 return 0;
1180 }
1181 }
1182 #endif
1183 return 1;
1184 }
1185
1186 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1187 int read_only)
1188 {
1189 struct ext3_sb_info *sbi = EXT3_SB(sb);
1190 int res = 0;
1191
1192 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1193 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1194 "forcing read-only mode\n");
1195 res = MS_RDONLY;
1196 }
1197 if (read_only)
1198 return res;
1199 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1200 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1201 "running e2fsck is recommended\n");
1202 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1203 printk (KERN_WARNING
1204 "EXT3-fs warning: mounting fs with errors, "
1205 "running e2fsck is recommended\n");
1206 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1207 le16_to_cpu(es->s_mnt_count) >=
1208 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1209 printk (KERN_WARNING
1210 "EXT3-fs warning: maximal mount count reached, "
1211 "running e2fsck is recommended\n");
1212 else if (le32_to_cpu(es->s_checkinterval) &&
1213 (le32_to_cpu(es->s_lastcheck) +
1214 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1215 printk (KERN_WARNING
1216 "EXT3-fs warning: checktime reached, "
1217 "running e2fsck is recommended\n");
1218 #if 0
1219 /* @@@ We _will_ want to clear the valid bit if we find
1220 inconsistencies, to force a fsck at reboot. But for
1221 a plain journaled filesystem we can keep it set as
1222 valid forever! :) */
1223 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1224 #endif
1225 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1226 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1227 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1228 es->s_mtime = cpu_to_le32(get_seconds());
1229 ext3_update_dynamic_rev(sb);
1230 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1231
1232 ext3_commit_super(sb, es, 1);
1233 if (test_opt(sb, DEBUG))
1234 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1235 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1236 sb->s_blocksize,
1237 sbi->s_groups_count,
1238 EXT3_BLOCKS_PER_GROUP(sb),
1239 EXT3_INODES_PER_GROUP(sb),
1240 sbi->s_mount_opt);
1241
1242 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1243 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1244 char b[BDEVNAME_SIZE];
1245
1246 printk("external journal on %s\n",
1247 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1248 } else {
1249 printk("internal journal\n");
1250 }
1251 return res;
1252 }
1253
1254 /* Called at mount-time, super-block is locked */
1255 static int ext3_check_descriptors (struct super_block * sb)
1256 {
1257 struct ext3_sb_info *sbi = EXT3_SB(sb);
1258 ext3_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1259 ext3_fsblk_t last_block;
1260 struct ext3_group_desc * gdp = NULL;
1261 int desc_block = 0;
1262 int i;
1263
1264 ext3_debug ("Checking group descriptors");
1265
1266 for (i = 0; i < sbi->s_groups_count; i++)
1267 {
1268 if (i == sbi->s_groups_count - 1)
1269 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1270 else
1271 last_block = first_block +
1272 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1273
1274 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1275 gdp = (struct ext3_group_desc *)
1276 sbi->s_group_desc[desc_block++]->b_data;
1277 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1278 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1279 {
1280 ext3_error (sb, "ext3_check_descriptors",
1281 "Block bitmap for group %d"
1282 " not in group (block %lu)!",
1283 i, (unsigned long)
1284 le32_to_cpu(gdp->bg_block_bitmap));
1285 return 0;
1286 }
1287 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1288 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1289 {
1290 ext3_error (sb, "ext3_check_descriptors",
1291 "Inode bitmap for group %d"
1292 " not in group (block %lu)!",
1293 i, (unsigned long)
1294 le32_to_cpu(gdp->bg_inode_bitmap));
1295 return 0;
1296 }
1297 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1298 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1299 last_block)
1300 {
1301 ext3_error (sb, "ext3_check_descriptors",
1302 "Inode table for group %d"
1303 " not in group (block %lu)!",
1304 i, (unsigned long)
1305 le32_to_cpu(gdp->bg_inode_table));
1306 return 0;
1307 }
1308 first_block += EXT3_BLOCKS_PER_GROUP(sb);
1309 gdp++;
1310 }
1311
1312 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1313 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1314 return 1;
1315 }
1316
1317
1318 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1319 * the superblock) which were deleted from all directories, but held open by
1320 * a process at the time of a crash. We walk the list and try to delete these
1321 * inodes at recovery time (only with a read-write filesystem).
1322 *
1323 * In order to keep the orphan inode chain consistent during traversal (in
1324 * case of crash during recovery), we link each inode into the superblock
1325 * orphan list_head and handle it the same way as an inode deletion during
1326 * normal operation (which journals the operations for us).
1327 *
1328 * We only do an iget() and an iput() on each inode, which is very safe if we
1329 * accidentally point at an in-use or already deleted inode. The worst that
1330 * can happen in this case is that we get a "bit already cleared" message from
1331 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1332 * e2fsck was run on this filesystem, and it must have already done the orphan
1333 * inode cleanup for us, so we can safely abort without any further action.
1334 */
1335 static void ext3_orphan_cleanup (struct super_block * sb,
1336 struct ext3_super_block * es)
1337 {
1338 unsigned int s_flags = sb->s_flags;
1339 int nr_orphans = 0, nr_truncates = 0;
1340 #ifdef CONFIG_QUOTA
1341 int i;
1342 #endif
1343 if (!es->s_last_orphan) {
1344 jbd_debug(4, "no orphan inodes to clean up\n");
1345 return;
1346 }
1347
1348 if (bdev_read_only(sb->s_bdev)) {
1349 printk(KERN_ERR "EXT3-fs: write access "
1350 "unavailable, skipping orphan cleanup.\n");
1351 return;
1352 }
1353
1354 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1355 if (es->s_last_orphan)
1356 jbd_debug(1, "Errors on filesystem, "
1357 "clearing orphan list.\n");
1358 es->s_last_orphan = 0;
1359 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1360 return;
1361 }
1362
1363 if (s_flags & MS_RDONLY) {
1364 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1365 sb->s_id);
1366 sb->s_flags &= ~MS_RDONLY;
1367 }
1368 #ifdef CONFIG_QUOTA
1369 /* Needed for iput() to work correctly and not trash data */
1370 sb->s_flags |= MS_ACTIVE;
1371 /* Turn on quotas so that they are updated correctly */
1372 for (i = 0; i < MAXQUOTAS; i++) {
1373 if (EXT3_SB(sb)->s_qf_names[i]) {
1374 int ret = ext3_quota_on_mount(sb, i);
1375 if (ret < 0)
1376 printk(KERN_ERR
1377 "EXT3-fs: Cannot turn on journalled "
1378 "quota: error %d\n", ret);
1379 }
1380 }
1381 #endif
1382
1383 while (es->s_last_orphan) {
1384 struct inode *inode;
1385
1386 if (!(inode =
1387 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1388 es->s_last_orphan = 0;
1389 break;
1390 }
1391
1392 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1393 DQUOT_INIT(inode);
1394 if (inode->i_nlink) {
1395 printk(KERN_DEBUG
1396 "%s: truncating inode %lu to %Ld bytes\n",
1397 __FUNCTION__, inode->i_ino, inode->i_size);
1398 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1399 inode->i_ino, inode->i_size);
1400 ext3_truncate(inode);
1401 nr_truncates++;
1402 } else {
1403 printk(KERN_DEBUG
1404 "%s: deleting unreferenced inode %lu\n",
1405 __FUNCTION__, inode->i_ino);
1406 jbd_debug(2, "deleting unreferenced inode %lu\n",
1407 inode->i_ino);
1408 nr_orphans++;
1409 }
1410 iput(inode); /* The delete magic happens here! */
1411 }
1412
1413 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1414
1415 if (nr_orphans)
1416 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1417 sb->s_id, PLURAL(nr_orphans));
1418 if (nr_truncates)
1419 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1420 sb->s_id, PLURAL(nr_truncates));
1421 #ifdef CONFIG_QUOTA
1422 /* Turn quotas off */
1423 for (i = 0; i < MAXQUOTAS; i++) {
1424 if (sb_dqopt(sb)->files[i])
1425 vfs_quota_off(sb, i);
1426 }
1427 #endif
1428 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1429 }
1430
1431 /*
1432 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1433 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1434 * We need to be 1 filesystem block less than the 2^32 sector limit.
1435 */
1436 static loff_t ext3_max_size(int bits)
1437 {
1438 loff_t res = EXT3_NDIR_BLOCKS;
1439 int meta_blocks;
1440 loff_t upper_limit;
1441
1442 /* This is calculated to be the largest file size for a
1443 * dense, file such that the total number of
1444 * sectors in the file, including data and all indirect blocks,
1445 * does not exceed 2^32 -1
1446 * __u32 i_blocks representing the total number of
1447 * 512 bytes blocks of the file
1448 */
1449 upper_limit = (1LL << 32) - 1;
1450
1451 /* total blocks in file system block size */
1452 upper_limit >>= (bits - 9);
1453
1454
1455 /* indirect blocks */
1456 meta_blocks = 1;
1457 /* double indirect blocks */
1458 meta_blocks += 1 + (1LL << (bits-2));
1459 /* tripple indirect blocks */
1460 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1461
1462 upper_limit -= meta_blocks;
1463 upper_limit <<= bits;
1464
1465 res += 1LL << (bits-2);
1466 res += 1LL << (2*(bits-2));
1467 res += 1LL << (3*(bits-2));
1468 res <<= bits;
1469 if (res > upper_limit)
1470 res = upper_limit;
1471
1472 if (res > MAX_LFS_FILESIZE)
1473 res = MAX_LFS_FILESIZE;
1474
1475 return res;
1476 }
1477
1478 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1479 ext3_fsblk_t logic_sb_block,
1480 int nr)
1481 {
1482 struct ext3_sb_info *sbi = EXT3_SB(sb);
1483 unsigned long bg, first_meta_bg;
1484 int has_super = 0;
1485
1486 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1487
1488 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1489 nr < first_meta_bg)
1490 return (logic_sb_block + nr + 1);
1491 bg = sbi->s_desc_per_block * nr;
1492 if (ext3_bg_has_super(sb, bg))
1493 has_super = 1;
1494 return (has_super + ext3_group_first_block_no(sb, bg));
1495 }
1496
1497
1498 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1499 {
1500 struct buffer_head * bh;
1501 struct ext3_super_block *es = NULL;
1502 struct ext3_sb_info *sbi;
1503 ext3_fsblk_t block;
1504 ext3_fsblk_t sb_block = get_sb_block(&data);
1505 ext3_fsblk_t logic_sb_block;
1506 unsigned long offset = 0;
1507 unsigned int journal_inum = 0;
1508 unsigned long journal_devnum = 0;
1509 unsigned long def_mount_opts;
1510 struct inode *root;
1511 int blocksize;
1512 int hblock;
1513 int db_count;
1514 int i;
1515 int needs_recovery;
1516 __le32 features;
1517 int err;
1518
1519 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1520 if (!sbi)
1521 return -ENOMEM;
1522 sb->s_fs_info = sbi;
1523 sbi->s_mount_opt = 0;
1524 sbi->s_resuid = EXT3_DEF_RESUID;
1525 sbi->s_resgid = EXT3_DEF_RESGID;
1526 sbi->s_sb_block = sb_block;
1527
1528 unlock_kernel();
1529
1530 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1531 if (!blocksize) {
1532 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1533 goto out_fail;
1534 }
1535
1536 /*
1537 * The ext3 superblock will not be buffer aligned for other than 1kB
1538 * block sizes. We need to calculate the offset from buffer start.
1539 */
1540 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1541 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1542 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1543 } else {
1544 logic_sb_block = sb_block;
1545 }
1546
1547 if (!(bh = sb_bread(sb, logic_sb_block))) {
1548 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1549 goto out_fail;
1550 }
1551 /*
1552 * Note: s_es must be initialized as soon as possible because
1553 * some ext3 macro-instructions depend on its value
1554 */
1555 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1556 sbi->s_es = es;
1557 sb->s_magic = le16_to_cpu(es->s_magic);
1558 if (sb->s_magic != EXT3_SUPER_MAGIC)
1559 goto cantfind_ext3;
1560
1561 /* Set defaults before we parse the mount options */
1562 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1563 if (def_mount_opts & EXT3_DEFM_DEBUG)
1564 set_opt(sbi->s_mount_opt, DEBUG);
1565 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1566 set_opt(sbi->s_mount_opt, GRPID);
1567 if (def_mount_opts & EXT3_DEFM_UID16)
1568 set_opt(sbi->s_mount_opt, NO_UID32);
1569 #ifdef CONFIG_EXT3_FS_XATTR
1570 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1571 set_opt(sbi->s_mount_opt, XATTR_USER);
1572 #endif
1573 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1574 if (def_mount_opts & EXT3_DEFM_ACL)
1575 set_opt(sbi->s_mount_opt, POSIX_ACL);
1576 #endif
1577 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1578 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1579 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1580 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1581 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1582 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1583
1584 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1585 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1586 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1587 set_opt(sbi->s_mount_opt, ERRORS_RO);
1588 else
1589 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1590
1591 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1592 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1593
1594 set_opt(sbi->s_mount_opt, RESERVATION);
1595
1596 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1597 NULL, 0))
1598 goto failed_mount;
1599
1600 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1601 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1602
1603 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1604 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1605 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1606 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1607 printk(KERN_WARNING
1608 "EXT3-fs warning: feature flags set on rev 0 fs, "
1609 "running e2fsck is recommended\n");
1610 /*
1611 * Check feature flags regardless of the revision level, since we
1612 * previously didn't change the revision level when setting the flags,
1613 * so there is a chance incompat flags are set on a rev 0 filesystem.
1614 */
1615 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1616 if (features) {
1617 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1618 "unsupported optional features (%x).\n",
1619 sb->s_id, le32_to_cpu(features));
1620 goto failed_mount;
1621 }
1622 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1623 if (!(sb->s_flags & MS_RDONLY) && features) {
1624 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1625 "unsupported optional features (%x).\n",
1626 sb->s_id, le32_to_cpu(features));
1627 goto failed_mount;
1628 }
1629 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1630
1631 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1632 blocksize > EXT3_MAX_BLOCK_SIZE) {
1633 printk(KERN_ERR
1634 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1635 blocksize, sb->s_id);
1636 goto failed_mount;
1637 }
1638
1639 hblock = bdev_hardsect_size(sb->s_bdev);
1640 if (sb->s_blocksize != blocksize) {
1641 /*
1642 * Make sure the blocksize for the filesystem is larger
1643 * than the hardware sectorsize for the machine.
1644 */
1645 if (blocksize < hblock) {
1646 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1647 "device blocksize %d.\n", blocksize, hblock);
1648 goto failed_mount;
1649 }
1650
1651 brelse (bh);
1652 if (!sb_set_blocksize(sb, blocksize)) {
1653 printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1654 blocksize);
1655 goto out_fail;
1656 }
1657 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1658 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1659 bh = sb_bread(sb, logic_sb_block);
1660 if (!bh) {
1661 printk(KERN_ERR
1662 "EXT3-fs: Can't read superblock on 2nd try.\n");
1663 goto failed_mount;
1664 }
1665 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1666 sbi->s_es = es;
1667 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1668 printk (KERN_ERR
1669 "EXT3-fs: Magic mismatch, very weird !\n");
1670 goto failed_mount;
1671 }
1672 }
1673
1674 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1675
1676 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1677 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1678 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1679 } else {
1680 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1681 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1682 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1683 (!is_power_of_2(sbi->s_inode_size)) ||
1684 (sbi->s_inode_size > blocksize)) {
1685 printk (KERN_ERR
1686 "EXT3-fs: unsupported inode size: %d\n",
1687 sbi->s_inode_size);
1688 goto failed_mount;
1689 }
1690 }
1691 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1692 le32_to_cpu(es->s_log_frag_size);
1693 if (blocksize != sbi->s_frag_size) {
1694 printk(KERN_ERR
1695 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1696 sbi->s_frag_size, blocksize);
1697 goto failed_mount;
1698 }
1699 sbi->s_frags_per_block = 1;
1700 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1701 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1702 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1703 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1704 goto cantfind_ext3;
1705 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1706 if (sbi->s_inodes_per_block == 0)
1707 goto cantfind_ext3;
1708 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1709 sbi->s_inodes_per_block;
1710 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1711 sbi->s_sbh = bh;
1712 sbi->s_mount_state = le16_to_cpu(es->s_state);
1713 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1714 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1715 for (i=0; i < 4; i++)
1716 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1717 sbi->s_def_hash_version = es->s_def_hash_version;
1718
1719 if (sbi->s_blocks_per_group > blocksize * 8) {
1720 printk (KERN_ERR
1721 "EXT3-fs: #blocks per group too big: %lu\n",
1722 sbi->s_blocks_per_group);
1723 goto failed_mount;
1724 }
1725 if (sbi->s_frags_per_group > blocksize * 8) {
1726 printk (KERN_ERR
1727 "EXT3-fs: #fragments per group too big: %lu\n",
1728 sbi->s_frags_per_group);
1729 goto failed_mount;
1730 }
1731 if (sbi->s_inodes_per_group > blocksize * 8) {
1732 printk (KERN_ERR
1733 "EXT3-fs: #inodes per group too big: %lu\n",
1734 sbi->s_inodes_per_group);
1735 goto failed_mount;
1736 }
1737
1738 if (le32_to_cpu(es->s_blocks_count) >
1739 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1740 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1741 " too large to mount safely\n", sb->s_id);
1742 if (sizeof(sector_t) < 8)
1743 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1744 "enabled\n");
1745 goto failed_mount;
1746 }
1747
1748 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1749 goto cantfind_ext3;
1750 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1751 le32_to_cpu(es->s_first_data_block) - 1)
1752 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1753 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1754 EXT3_DESC_PER_BLOCK(sb);
1755 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1756 GFP_KERNEL);
1757 if (sbi->s_group_desc == NULL) {
1758 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1759 goto failed_mount;
1760 }
1761
1762 bgl_lock_init(&sbi->s_blockgroup_lock);
1763
1764 for (i = 0; i < db_count; i++) {
1765 block = descriptor_loc(sb, logic_sb_block, i);
1766 sbi->s_group_desc[i] = sb_bread(sb, block);
1767 if (!sbi->s_group_desc[i]) {
1768 printk (KERN_ERR "EXT3-fs: "
1769 "can't read group descriptor %d\n", i);
1770 db_count = i;
1771 goto failed_mount2;
1772 }
1773 }
1774 if (!ext3_check_descriptors (sb)) {
1775 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1776 goto failed_mount2;
1777 }
1778 sbi->s_gdb_count = db_count;
1779 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1780 spin_lock_init(&sbi->s_next_gen_lock);
1781
1782 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1783 ext3_count_free_blocks(sb));
1784 if (!err) {
1785 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1786 ext3_count_free_inodes(sb));
1787 }
1788 if (!err) {
1789 err = percpu_counter_init(&sbi->s_dirs_counter,
1790 ext3_count_dirs(sb));
1791 }
1792 if (err) {
1793 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1794 goto failed_mount3;
1795 }
1796
1797 /* per fileystem reservation list head & lock */
1798 spin_lock_init(&sbi->s_rsv_window_lock);
1799 sbi->s_rsv_window_root = RB_ROOT;
1800 /* Add a single, static dummy reservation to the start of the
1801 * reservation window list --- it gives us a placeholder for
1802 * append-at-start-of-list which makes the allocation logic
1803 * _much_ simpler. */
1804 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1805 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1806 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1807 sbi->s_rsv_window_head.rsv_goal_size = 0;
1808 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1809
1810 /*
1811 * set up enough so that it can read an inode
1812 */
1813 sb->s_op = &ext3_sops;
1814 sb->s_export_op = &ext3_export_ops;
1815 sb->s_xattr = ext3_xattr_handlers;
1816 #ifdef CONFIG_QUOTA
1817 sb->s_qcop = &ext3_qctl_operations;
1818 sb->dq_op = &ext3_quota_operations;
1819 #endif
1820 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1821
1822 sb->s_root = NULL;
1823
1824 needs_recovery = (es->s_last_orphan != 0 ||
1825 EXT3_HAS_INCOMPAT_FEATURE(sb,
1826 EXT3_FEATURE_INCOMPAT_RECOVER));
1827
1828 /*
1829 * The first inode we look at is the journal inode. Don't try
1830 * root first: it may be modified in the journal!
1831 */
1832 if (!test_opt(sb, NOLOAD) &&
1833 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1834 if (ext3_load_journal(sb, es, journal_devnum))
1835 goto failed_mount3;
1836 } else if (journal_inum) {
1837 if (ext3_create_journal(sb, es, journal_inum))
1838 goto failed_mount3;
1839 } else {
1840 if (!silent)
1841 printk (KERN_ERR
1842 "ext3: No journal on filesystem on %s\n",
1843 sb->s_id);
1844 goto failed_mount3;
1845 }
1846
1847 /* We have now updated the journal if required, so we can
1848 * validate the data journaling mode. */
1849 switch (test_opt(sb, DATA_FLAGS)) {
1850 case 0:
1851 /* No mode set, assume a default based on the journal
1852 capabilities: ORDERED_DATA if the journal can
1853 cope, else JOURNAL_DATA */
1854 if (journal_check_available_features
1855 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1856 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1857 else
1858 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1859 break;
1860
1861 case EXT3_MOUNT_ORDERED_DATA:
1862 case EXT3_MOUNT_WRITEBACK_DATA:
1863 if (!journal_check_available_features
1864 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1865 printk(KERN_ERR "EXT3-fs: Journal does not support "
1866 "requested data journaling mode\n");
1867 goto failed_mount4;
1868 }
1869 default:
1870 break;
1871 }
1872
1873 if (test_opt(sb, NOBH)) {
1874 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1875 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1876 "its supported only with writeback mode\n");
1877 clear_opt(sbi->s_mount_opt, NOBH);
1878 }
1879 }
1880 /*
1881 * The journal_load will have done any necessary log recovery,
1882 * so we can safely mount the rest of the filesystem now.
1883 */
1884
1885 root = iget(sb, EXT3_ROOT_INO);
1886 sb->s_root = d_alloc_root(root);
1887 if (!sb->s_root) {
1888 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1889 iput(root);
1890 goto failed_mount4;
1891 }
1892 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1893 dput(sb->s_root);
1894 sb->s_root = NULL;
1895 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1896 goto failed_mount4;
1897 }
1898
1899 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1900 /*
1901 * akpm: core read_super() calls in here with the superblock locked.
1902 * That deadlocks, because orphan cleanup needs to lock the superblock
1903 * in numerous places. Here we just pop the lock - it's relatively
1904 * harmless, because we are now ready to accept write_super() requests,
1905 * and aviro says that's the only reason for hanging onto the
1906 * superblock lock.
1907 */
1908 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1909 ext3_orphan_cleanup(sb, es);
1910 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1911 if (needs_recovery)
1912 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1913 ext3_mark_recovery_complete(sb, es);
1914 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1915 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1916 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1917 "writeback");
1918
1919 lock_kernel();
1920 return 0;
1921
1922 cantfind_ext3:
1923 if (!silent)
1924 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1925 sb->s_id);
1926 goto failed_mount;
1927
1928 failed_mount4:
1929 journal_destroy(sbi->s_journal);
1930 failed_mount3:
1931 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1932 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1933 percpu_counter_destroy(&sbi->s_dirs_counter);
1934 failed_mount2:
1935 for (i = 0; i < db_count; i++)
1936 brelse(sbi->s_group_desc[i]);
1937 kfree(sbi->s_group_desc);
1938 failed_mount:
1939 #ifdef CONFIG_QUOTA
1940 for (i = 0; i < MAXQUOTAS; i++)
1941 kfree(sbi->s_qf_names[i]);
1942 #endif
1943 ext3_blkdev_remove(sbi);
1944 brelse(bh);
1945 out_fail:
1946 sb->s_fs_info = NULL;
1947 kfree(sbi);
1948 lock_kernel();
1949 return -EINVAL;
1950 }
1951
1952 /*
1953 * Setup any per-fs journal parameters now. We'll do this both on
1954 * initial mount, once the journal has been initialised but before we've
1955 * done any recovery; and again on any subsequent remount.
1956 */
1957 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1958 {
1959 struct ext3_sb_info *sbi = EXT3_SB(sb);
1960
1961 if (sbi->s_commit_interval)
1962 journal->j_commit_interval = sbi->s_commit_interval;
1963 /* We could also set up an ext3-specific default for the commit
1964 * interval here, but for now we'll just fall back to the jbd
1965 * default. */
1966
1967 spin_lock(&journal->j_state_lock);
1968 if (test_opt(sb, BARRIER))
1969 journal->j_flags |= JFS_BARRIER;
1970 else
1971 journal->j_flags &= ~JFS_BARRIER;
1972 spin_unlock(&journal->j_state_lock);
1973 }
1974
1975 static journal_t *ext3_get_journal(struct super_block *sb,
1976 unsigned int journal_inum)
1977 {
1978 struct inode *journal_inode;
1979 journal_t *journal;
1980
1981 /* First, test for the existence of a valid inode on disk. Bad
1982 * things happen if we iget() an unused inode, as the subsequent
1983 * iput() will try to delete it. */
1984
1985 journal_inode = iget(sb, journal_inum);
1986 if (!journal_inode) {
1987 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1988 return NULL;
1989 }
1990 if (!journal_inode->i_nlink) {
1991 make_bad_inode(journal_inode);
1992 iput(journal_inode);
1993 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1994 return NULL;
1995 }
1996
1997 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1998 journal_inode, journal_inode->i_size);
1999 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
2000 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2001 iput(journal_inode);
2002 return NULL;
2003 }
2004
2005 journal = journal_init_inode(journal_inode);
2006 if (!journal) {
2007 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2008 iput(journal_inode);
2009 return NULL;
2010 }
2011 journal->j_private = sb;
2012 ext3_init_journal_params(sb, journal);
2013 return journal;
2014 }
2015
2016 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2017 dev_t j_dev)
2018 {
2019 struct buffer_head * bh;
2020 journal_t *journal;
2021 ext3_fsblk_t start;
2022 ext3_fsblk_t len;
2023 int hblock, blocksize;
2024 ext3_fsblk_t sb_block;
2025 unsigned long offset;
2026 struct ext3_super_block * es;
2027 struct block_device *bdev;
2028
2029 bdev = ext3_blkdev_get(j_dev);
2030 if (bdev == NULL)
2031 return NULL;
2032
2033 if (bd_claim(bdev, sb)) {
2034 printk(KERN_ERR
2035 "EXT3: failed to claim external journal device.\n");
2036 blkdev_put(bdev);
2037 return NULL;
2038 }
2039
2040 blocksize = sb->s_blocksize;
2041 hblock = bdev_hardsect_size(bdev);
2042 if (blocksize < hblock) {
2043 printk(KERN_ERR
2044 "EXT3-fs: blocksize too small for journal device.\n");
2045 goto out_bdev;
2046 }
2047
2048 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2049 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2050 set_blocksize(bdev, blocksize);
2051 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2052 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2053 "external journal\n");
2054 goto out_bdev;
2055 }
2056
2057 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2058 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2059 !(le32_to_cpu(es->s_feature_incompat) &
2060 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2061 printk(KERN_ERR "EXT3-fs: external journal has "
2062 "bad superblock\n");
2063 brelse(bh);
2064 goto out_bdev;
2065 }
2066
2067 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2068 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2069 brelse(bh);
2070 goto out_bdev;
2071 }
2072
2073 len = le32_to_cpu(es->s_blocks_count);
2074 start = sb_block + 1;
2075 brelse(bh); /* we're done with the superblock */
2076
2077 journal = journal_init_dev(bdev, sb->s_bdev,
2078 start, len, blocksize);
2079 if (!journal) {
2080 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2081 goto out_bdev;
2082 }
2083 journal->j_private = sb;
2084 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2085 wait_on_buffer(journal->j_sb_buffer);
2086 if (!buffer_uptodate(journal->j_sb_buffer)) {
2087 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2088 goto out_journal;
2089 }
2090 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2091 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2092 "user (unsupported) - %d\n",
2093 be32_to_cpu(journal->j_superblock->s_nr_users));
2094 goto out_journal;
2095 }
2096 EXT3_SB(sb)->journal_bdev = bdev;
2097 ext3_init_journal_params(sb, journal);
2098 return journal;
2099 out_journal:
2100 journal_destroy(journal);
2101 out_bdev:
2102 ext3_blkdev_put(bdev);
2103 return NULL;
2104 }
2105
2106 static int ext3_load_journal(struct super_block *sb,
2107 struct ext3_super_block *es,
2108 unsigned long journal_devnum)
2109 {
2110 journal_t *journal;
2111 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2112 dev_t journal_dev;
2113 int err = 0;
2114 int really_read_only;
2115
2116 if (journal_devnum &&
2117 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2118 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2119 "numbers have changed\n");
2120 journal_dev = new_decode_dev(journal_devnum);
2121 } else
2122 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2123
2124 really_read_only = bdev_read_only(sb->s_bdev);
2125
2126 /*
2127 * Are we loading a blank journal or performing recovery after a
2128 * crash? For recovery, we need to check in advance whether we
2129 * can get read-write access to the device.
2130 */
2131
2132 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2133 if (sb->s_flags & MS_RDONLY) {
2134 printk(KERN_INFO "EXT3-fs: INFO: recovery "
2135 "required on readonly filesystem.\n");
2136 if (really_read_only) {
2137 printk(KERN_ERR "EXT3-fs: write access "
2138 "unavailable, cannot proceed.\n");
2139 return -EROFS;
2140 }
2141 printk (KERN_INFO "EXT3-fs: write access will "
2142 "be enabled during recovery.\n");
2143 }
2144 }
2145
2146 if (journal_inum && journal_dev) {
2147 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2148 "and inode journals!\n");
2149 return -EINVAL;
2150 }
2151
2152 if (journal_inum) {
2153 if (!(journal = ext3_get_journal(sb, journal_inum)))
2154 return -EINVAL;
2155 } else {
2156 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2157 return -EINVAL;
2158 }
2159
2160 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2161 err = journal_update_format(journal);
2162 if (err) {
2163 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2164 journal_destroy(journal);
2165 return err;
2166 }
2167 }
2168
2169 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2170 err = journal_wipe(journal, !really_read_only);
2171 if (!err)
2172 err = journal_load(journal);
2173
2174 if (err) {
2175 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2176 journal_destroy(journal);
2177 return err;
2178 }
2179
2180 EXT3_SB(sb)->s_journal = journal;
2181 ext3_clear_journal_err(sb, es);
2182
2183 if (journal_devnum &&
2184 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2185 es->s_journal_dev = cpu_to_le32(journal_devnum);
2186 sb->s_dirt = 1;
2187
2188 /* Make sure we flush the recovery flag to disk. */
2189 ext3_commit_super(sb, es, 1);
2190 }
2191
2192 return 0;
2193 }
2194
2195 static int ext3_create_journal(struct super_block * sb,
2196 struct ext3_super_block * es,
2197 unsigned int journal_inum)
2198 {
2199 journal_t *journal;
2200 int err;
2201
2202 if (sb->s_flags & MS_RDONLY) {
2203 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2204 "create journal.\n");
2205 return -EROFS;
2206 }
2207
2208 journal = ext3_get_journal(sb, journal_inum);
2209 if (!journal)
2210 return -EINVAL;
2211
2212 printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2213 journal_inum);
2214
2215 err = journal_create(journal);
2216 if (err) {
2217 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2218 journal_destroy(journal);
2219 return -EIO;
2220 }
2221
2222 EXT3_SB(sb)->s_journal = journal;
2223
2224 ext3_update_dynamic_rev(sb);
2225 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2226 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2227
2228 es->s_journal_inum = cpu_to_le32(journal_inum);
2229 sb->s_dirt = 1;
2230
2231 /* Make sure we flush the recovery flag to disk. */
2232 ext3_commit_super(sb, es, 1);
2233
2234 return 0;
2235 }
2236
2237 static void ext3_commit_super (struct super_block * sb,
2238 struct ext3_super_block * es,
2239 int sync)
2240 {
2241 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2242
2243 if (!sbh)
2244 return;
2245 es->s_wtime = cpu_to_le32(get_seconds());
2246 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2247 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2248 BUFFER_TRACE(sbh, "marking dirty");
2249 mark_buffer_dirty(sbh);
2250 if (sync)
2251 sync_dirty_buffer(sbh);
2252 }
2253
2254
2255 /*
2256 * Have we just finished recovery? If so, and if we are mounting (or
2257 * remounting) the filesystem readonly, then we will end up with a
2258 * consistent fs on disk. Record that fact.
2259 */
2260 static void ext3_mark_recovery_complete(struct super_block * sb,
2261 struct ext3_super_block * es)
2262 {
2263 journal_t *journal = EXT3_SB(sb)->s_journal;
2264
2265 journal_lock_updates(journal);
2266 journal_flush(journal);
2267 lock_super(sb);
2268 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2269 sb->s_flags & MS_RDONLY) {
2270 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2271 sb->s_dirt = 0;
2272 ext3_commit_super(sb, es, 1);
2273 }
2274 unlock_super(sb);
2275 journal_unlock_updates(journal);
2276 }
2277
2278 /*
2279 * If we are mounting (or read-write remounting) a filesystem whose journal
2280 * has recorded an error from a previous lifetime, move that error to the
2281 * main filesystem now.
2282 */
2283 static void ext3_clear_journal_err(struct super_block * sb,
2284 struct ext3_super_block * es)
2285 {
2286 journal_t *journal;
2287 int j_errno;
2288 const char *errstr;
2289
2290 journal = EXT3_SB(sb)->s_journal;
2291
2292 /*
2293 * Now check for any error status which may have been recorded in the
2294 * journal by a prior ext3_error() or ext3_abort()
2295 */
2296
2297 j_errno = journal_errno(journal);
2298 if (j_errno) {
2299 char nbuf[16];
2300
2301 errstr = ext3_decode_error(sb, j_errno, nbuf);
2302 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2303 "from previous mount: %s", errstr);
2304 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2305 "filesystem check.");
2306
2307 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2308 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2309 ext3_commit_super (sb, es, 1);
2310
2311 journal_clear_err(journal);
2312 }
2313 }
2314
2315 /*
2316 * Force the running and committing transactions to commit,
2317 * and wait on the commit.
2318 */
2319 int ext3_force_commit(struct super_block *sb)
2320 {
2321 journal_t *journal;
2322 int ret;
2323
2324 if (sb->s_flags & MS_RDONLY)
2325 return 0;
2326
2327 journal = EXT3_SB(sb)->s_journal;
2328 sb->s_dirt = 0;
2329 ret = ext3_journal_force_commit(journal);
2330 return ret;
2331 }
2332
2333 /*
2334 * Ext3 always journals updates to the superblock itself, so we don't
2335 * have to propagate any other updates to the superblock on disk at this
2336 * point. Just start an async writeback to get the buffers on their way
2337 * to the disk.
2338 *
2339 * This implicitly triggers the writebehind on sync().
2340 */
2341
2342 static void ext3_write_super (struct super_block * sb)
2343 {
2344 if (mutex_trylock(&sb->s_lock) != 0)
2345 BUG();
2346 sb->s_dirt = 0;
2347 }
2348
2349 static int ext3_sync_fs(struct super_block *sb, int wait)
2350 {
2351 tid_t target;
2352
2353 sb->s_dirt = 0;
2354 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2355 if (wait)
2356 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2357 }
2358 return 0;
2359 }
2360
2361 /*
2362 * LVM calls this function before a (read-only) snapshot is created. This
2363 * gives us a chance to flush the journal completely and mark the fs clean.
2364 */
2365 static void ext3_write_super_lockfs(struct super_block *sb)
2366 {
2367 sb->s_dirt = 0;
2368
2369 if (!(sb->s_flags & MS_RDONLY)) {
2370 journal_t *journal = EXT3_SB(sb)->s_journal;
2371
2372 /* Now we set up the journal barrier. */
2373 journal_lock_updates(journal);
2374 journal_flush(journal);
2375
2376 /* Journal blocked and flushed, clear needs_recovery flag. */
2377 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2378 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2379 }
2380 }
2381
2382 /*
2383 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2384 * flag here, even though the filesystem is not technically dirty yet.
2385 */
2386 static void ext3_unlockfs(struct super_block *sb)
2387 {
2388 if (!(sb->s_flags & MS_RDONLY)) {
2389 lock_super(sb);
2390 /* Reser the needs_recovery flag before the fs is unlocked. */
2391 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2392 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2393 unlock_super(sb);
2394 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2395 }
2396 }
2397
2398 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2399 {
2400 struct ext3_super_block * es;
2401 struct ext3_sb_info *sbi = EXT3_SB(sb);
2402 ext3_fsblk_t n_blocks_count = 0;
2403 unsigned long old_sb_flags;
2404 struct ext3_mount_options old_opts;
2405 int err;
2406 #ifdef CONFIG_QUOTA
2407 int i;
2408 #endif
2409
2410 /* Store the original options */
2411 old_sb_flags = sb->s_flags;
2412 old_opts.s_mount_opt = sbi->s_mount_opt;
2413 old_opts.s_resuid = sbi->s_resuid;
2414 old_opts.s_resgid = sbi->s_resgid;
2415 old_opts.s_commit_interval = sbi->s_commit_interval;
2416 #ifdef CONFIG_QUOTA
2417 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2418 for (i = 0; i < MAXQUOTAS; i++)
2419 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2420 #endif
2421
2422 /*
2423 * Allow the "check" option to be passed as a remount option.
2424 */
2425 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2426 err = -EINVAL;
2427 goto restore_opts;
2428 }
2429
2430 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2431 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2432
2433 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2434 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2435
2436 es = sbi->s_es;
2437
2438 ext3_init_journal_params(sb, sbi->s_journal);
2439
2440 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2441 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2442 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2443 err = -EROFS;
2444 goto restore_opts;
2445 }
2446
2447 if (*flags & MS_RDONLY) {
2448 /*
2449 * First of all, the unconditional stuff we have to do
2450 * to disable replay of the journal when we next remount
2451 */
2452 sb->s_flags |= MS_RDONLY;
2453
2454 /*
2455 * OK, test if we are remounting a valid rw partition
2456 * readonly, and if so set the rdonly flag and then
2457 * mark the partition as valid again.
2458 */
2459 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2460 (sbi->s_mount_state & EXT3_VALID_FS))
2461 es->s_state = cpu_to_le16(sbi->s_mount_state);
2462
2463 /*
2464 * We have to unlock super so that we can wait for
2465 * transactions.
2466 */
2467 unlock_super(sb);
2468 ext3_mark_recovery_complete(sb, es);
2469 lock_super(sb);
2470 } else {
2471 __le32 ret;
2472 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2473 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2474 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2475 "remount RDWR because of unsupported "
2476 "optional features (%x).\n",
2477 sb->s_id, le32_to_cpu(ret));
2478 err = -EROFS;
2479 goto restore_opts;
2480 }
2481
2482 /*
2483 * If we have an unprocessed orphan list hanging
2484 * around from a previously readonly bdev mount,
2485 * require a full umount/remount for now.
2486 */
2487 if (es->s_last_orphan) {
2488 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2489 "remount RDWR because of unprocessed "
2490 "orphan inode list. Please "
2491 "umount/remount instead.\n",
2492 sb->s_id);
2493 err = -EINVAL;
2494 goto restore_opts;
2495 }
2496
2497 /*
2498 * Mounting a RDONLY partition read-write, so reread
2499 * and store the current valid flag. (It may have
2500 * been changed by e2fsck since we originally mounted
2501 * the partition.)
2502 */
2503 ext3_clear_journal_err(sb, es);
2504 sbi->s_mount_state = le16_to_cpu(es->s_state);
2505 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2506 goto restore_opts;
2507 if (!ext3_setup_super (sb, es, 0))
2508 sb->s_flags &= ~MS_RDONLY;
2509 }
2510 }
2511 #ifdef CONFIG_QUOTA
2512 /* Release old quota file names */
2513 for (i = 0; i < MAXQUOTAS; i++)
2514 if (old_opts.s_qf_names[i] &&
2515 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2516 kfree(old_opts.s_qf_names[i]);
2517 #endif
2518 return 0;
2519 restore_opts:
2520 sb->s_flags = old_sb_flags;
2521 sbi->s_mount_opt = old_opts.s_mount_opt;
2522 sbi->s_resuid = old_opts.s_resuid;
2523 sbi->s_resgid = old_opts.s_resgid;
2524 sbi->s_commit_interval = old_opts.s_commit_interval;
2525 #ifdef CONFIG_QUOTA
2526 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2527 for (i = 0; i < MAXQUOTAS; i++) {
2528 if (sbi->s_qf_names[i] &&
2529 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2530 kfree(sbi->s_qf_names[i]);
2531 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2532 }
2533 #endif
2534 return err;
2535 }
2536
2537 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2538 {
2539 struct super_block *sb = dentry->d_sb;
2540 struct ext3_sb_info *sbi = EXT3_SB(sb);
2541 struct ext3_super_block *es = sbi->s_es;
2542 u64 fsid;
2543
2544 if (test_opt(sb, MINIX_DF)) {
2545 sbi->s_overhead_last = 0;
2546 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2547 unsigned long ngroups = sbi->s_groups_count, i;
2548 ext3_fsblk_t overhead = 0;
2549 smp_rmb();
2550
2551 /*
2552 * Compute the overhead (FS structures). This is constant
2553 * for a given filesystem unless the number of block groups
2554 * changes so we cache the previous value until it does.
2555 */
2556
2557 /*
2558 * All of the blocks before first_data_block are
2559 * overhead
2560 */
2561 overhead = le32_to_cpu(es->s_first_data_block);
2562
2563 /*
2564 * Add the overhead attributed to the superblock and
2565 * block group descriptors. If the sparse superblocks
2566 * feature is turned on, then not all groups have this.
2567 */
2568 for (i = 0; i < ngroups; i++) {
2569 overhead += ext3_bg_has_super(sb, i) +
2570 ext3_bg_num_gdb(sb, i);
2571 cond_resched();
2572 }
2573
2574 /*
2575 * Every block group has an inode bitmap, a block
2576 * bitmap, and an inode table.
2577 */
2578 overhead += ngroups * (2 + sbi->s_itb_per_group);
2579 sbi->s_overhead_last = overhead;
2580 smp_wmb();
2581 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2582 }
2583
2584 buf->f_type = EXT3_SUPER_MAGIC;
2585 buf->f_bsize = sb->s_blocksize;
2586 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2587 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2588 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2589 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2590 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2591 buf->f_bavail = 0;
2592 buf->f_files = le32_to_cpu(es->s_inodes_count);
2593 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2594 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2595 buf->f_namelen = EXT3_NAME_LEN;
2596 fsid = le64_to_cpup((void *)es->s_uuid) ^
2597 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2598 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2599 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2600 return 0;
2601 }
2602
2603 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2604 * is locked for write. Otherwise the are possible deadlocks:
2605 * Process 1 Process 2
2606 * ext3_create() quota_sync()
2607 * journal_start() write_dquot()
2608 * DQUOT_INIT() down(dqio_mutex)
2609 * down(dqio_mutex) journal_start()
2610 *
2611 */
2612
2613 #ifdef CONFIG_QUOTA
2614
2615 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2616 {
2617 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2618 }
2619
2620 static int ext3_dquot_initialize(struct inode *inode, int type)
2621 {
2622 handle_t *handle;
2623 int ret, err;
2624
2625 /* We may create quota structure so we need to reserve enough blocks */
2626 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2627 if (IS_ERR(handle))
2628 return PTR_ERR(handle);
2629 ret = dquot_initialize(inode, type);
2630 err = ext3_journal_stop(handle);
2631 if (!ret)
2632 ret = err;
2633 return ret;
2634 }
2635
2636 static int ext3_dquot_drop(struct inode *inode)
2637 {
2638 handle_t *handle;
2639 int ret, err;
2640
2641 /* We may delete quota structure so we need to reserve enough blocks */
2642 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2643 if (IS_ERR(handle))
2644 return PTR_ERR(handle);
2645 ret = dquot_drop(inode);
2646 err = ext3_journal_stop(handle);
2647 if (!ret)
2648 ret = err;
2649 return ret;
2650 }
2651
2652 static int ext3_write_dquot(struct dquot *dquot)
2653 {
2654 int ret, err;
2655 handle_t *handle;
2656 struct inode *inode;
2657
2658 inode = dquot_to_inode(dquot);
2659 handle = ext3_journal_start(inode,
2660 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2661 if (IS_ERR(handle))
2662 return PTR_ERR(handle);
2663 ret = dquot_commit(dquot);
2664 err = ext3_journal_stop(handle);
2665 if (!ret)
2666 ret = err;
2667 return ret;
2668 }
2669
2670 static int ext3_acquire_dquot(struct dquot *dquot)
2671 {
2672 int ret, err;
2673 handle_t *handle;
2674
2675 handle = ext3_journal_start(dquot_to_inode(dquot),
2676 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2677 if (IS_ERR(handle))
2678 return PTR_ERR(handle);
2679 ret = dquot_acquire(dquot);
2680 err = ext3_journal_stop(handle);
2681 if (!ret)
2682 ret = err;
2683 return ret;
2684 }
2685
2686 static int ext3_release_dquot(struct dquot *dquot)
2687 {
2688 int ret, err;
2689 handle_t *handle;
2690
2691 handle = ext3_journal_start(dquot_to_inode(dquot),
2692 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2693 if (IS_ERR(handle)) {
2694 /* Release dquot anyway to avoid endless cycle in dqput() */
2695 dquot_release(dquot);
2696 return PTR_ERR(handle);
2697 }
2698 ret = dquot_release(dquot);
2699 err = ext3_journal_stop(handle);
2700 if (!ret)
2701 ret = err;
2702 return ret;
2703 }
2704
2705 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2706 {
2707 /* Are we journalling quotas? */
2708 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2709 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2710 dquot_mark_dquot_dirty(dquot);
2711 return ext3_write_dquot(dquot);
2712 } else {
2713 return dquot_mark_dquot_dirty(dquot);
2714 }
2715 }
2716
2717 static int ext3_write_info(struct super_block *sb, int type)
2718 {
2719 int ret, err;
2720 handle_t *handle;
2721
2722 /* Data block + inode block */
2723 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2724 if (IS_ERR(handle))
2725 return PTR_ERR(handle);
2726 ret = dquot_commit_info(sb, type);
2727 err = ext3_journal_stop(handle);
2728 if (!ret)
2729 ret = err;
2730 return ret;
2731 }
2732
2733 /*
2734 * Turn on quotas during mount time - we need to find
2735 * the quota file and such...
2736 */
2737 static int ext3_quota_on_mount(struct super_block *sb, int type)
2738 {
2739 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2740 EXT3_SB(sb)->s_jquota_fmt, type);
2741 }
2742
2743 /*
2744 * Standard function to be called on quota_on
2745 */
2746 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2747 char *path)
2748 {
2749 int err;
2750 struct nameidata nd;
2751
2752 if (!test_opt(sb, QUOTA))
2753 return -EINVAL;
2754 /* Not journalling quota? */
2755 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2756 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2757 return vfs_quota_on(sb, type, format_id, path);
2758 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2759 if (err)
2760 return err;
2761 /* Quotafile not on the same filesystem? */
2762 if (nd.mnt->mnt_sb != sb) {
2763 path_release(&nd);
2764 return -EXDEV;
2765 }
2766 /* Quotafile not of fs root? */
2767 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2768 printk(KERN_WARNING
2769 "EXT3-fs: Quota file not on filesystem root. "
2770 "Journalled quota will not work.\n");
2771 path_release(&nd);
2772 return vfs_quota_on(sb, type, format_id, path);
2773 }
2774
2775 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2776 * acquiring the locks... As quota files are never truncated and quota code
2777 * itself serializes the operations (and noone else should touch the files)
2778 * we don't have to be afraid of races */
2779 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2780 size_t len, loff_t off)
2781 {
2782 struct inode *inode = sb_dqopt(sb)->files[type];
2783 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2784 int err = 0;
2785 int offset = off & (sb->s_blocksize - 1);
2786 int tocopy;
2787 size_t toread;
2788 struct buffer_head *bh;
2789 loff_t i_size = i_size_read(inode);
2790
2791 if (off > i_size)
2792 return 0;
2793 if (off+len > i_size)
2794 len = i_size-off;
2795 toread = len;
2796 while (toread > 0) {
2797 tocopy = sb->s_blocksize - offset < toread ?
2798 sb->s_blocksize - offset : toread;
2799 bh = ext3_bread(NULL, inode, blk, 0, &err);
2800 if (err)
2801 return err;
2802 if (!bh) /* A hole? */
2803 memset(data, 0, tocopy);
2804 else
2805 memcpy(data, bh->b_data+offset, tocopy);
2806 brelse(bh);
2807 offset = 0;
2808 toread -= tocopy;
2809 data += tocopy;
2810 blk++;
2811 }
2812 return len;
2813 }
2814
2815 /* Write to quotafile (we know the transaction is already started and has
2816 * enough credits) */
2817 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2818 const char *data, size_t len, loff_t off)
2819 {
2820 struct inode *inode = sb_dqopt(sb)->files[type];
2821 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2822 int err = 0;
2823 int offset = off & (sb->s_blocksize - 1);
2824 int tocopy;
2825 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2826 size_t towrite = len;
2827 struct buffer_head *bh;
2828 handle_t *handle = journal_current_handle();
2829
2830 if (!handle) {
2831 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2832 " cancelled because transaction is not started.\n",
2833 (unsigned long long)off, (unsigned long long)len);
2834 return -EIO;
2835 }
2836 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2837 while (towrite > 0) {
2838 tocopy = sb->s_blocksize - offset < towrite ?
2839 sb->s_blocksize - offset : towrite;
2840 bh = ext3_bread(handle, inode, blk, 1, &err);
2841 if (!bh)
2842 goto out;
2843 if (journal_quota) {
2844 err = ext3_journal_get_write_access(handle, bh);
2845 if (err) {
2846 brelse(bh);
2847 goto out;
2848 }
2849 }
2850 lock_buffer(bh);
2851 memcpy(bh->b_data+offset, data, tocopy);
2852 flush_dcache_page(bh->b_page);
2853 unlock_buffer(bh);
2854 if (journal_quota)
2855 err = ext3_journal_dirty_metadata(handle, bh);
2856 else {
2857 /* Always do at least ordered writes for quotas */
2858 err = ext3_journal_dirty_data(handle, bh);
2859 mark_buffer_dirty(bh);
2860 }
2861 brelse(bh);
2862 if (err)
2863 goto out;
2864 offset = 0;
2865 towrite -= tocopy;
2866 data += tocopy;
2867 blk++;
2868 }
2869 out:
2870 if (len == towrite)
2871 return err;
2872 if (inode->i_size < off+len-towrite) {
2873 i_size_write(inode, off+len-towrite);
2874 EXT3_I(inode)->i_disksize = inode->i_size;
2875 }
2876 inode->i_version++;
2877 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2878 ext3_mark_inode_dirty(handle, inode);
2879 mutex_unlock(&inode->i_mutex);
2880 return len - towrite;
2881 }
2882
2883 #endif
2884
2885 static int ext3_get_sb(struct file_system_type *fs_type,
2886 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2887 {
2888 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2889 }
2890
2891 static struct file_system_type ext3_fs_type = {
2892 .owner = THIS_MODULE,
2893 .name = "ext3",
2894 .get_sb = ext3_get_sb,
2895 .kill_sb = kill_block_super,
2896 .fs_flags = FS_REQUIRES_DEV,
2897 };
2898
2899 static int __init init_ext3_fs(void)
2900 {
2901 int err = init_ext3_xattr();
2902 if (err)
2903 return err;
2904 err = init_inodecache();
2905 if (err)
2906 goto out1;
2907 err = register_filesystem(&ext3_fs_type);
2908 if (err)
2909 goto out;
2910 return 0;
2911 out:
2912 destroy_inodecache();
2913 out1:
2914 exit_ext3_xattr();
2915 return err;
2916 }
2917
2918 static void __exit exit_ext3_fs(void)
2919 {
2920 unregister_filesystem(&ext3_fs_type);
2921 destroy_inodecache();
2922 exit_ext3_xattr();
2923 }
2924
2925 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2926 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2927 MODULE_LICENSE("GPL");
2928 module_init(init_ext3_fs)
2929 module_exit(exit_ext3_fs)
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