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Merge branch 'docs-next' of git://git.lwn.net/linux-2.6
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext3 / super.c
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, __func__,
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 if (EXT3_SB(sb)->s_journal)
285 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
286 }
287
288 void ext3_warning (struct super_block * sb, const char * function,
289 const char * fmt, ...)
290 {
291 va_list args;
292
293 va_start(args, fmt);
294 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
295 sb->s_id, function);
296 vprintk(fmt, args);
297 printk("\n");
298 va_end(args);
299 }
300
301 void ext3_update_dynamic_rev(struct super_block *sb)
302 {
303 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
304
305 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
306 return;
307
308 ext3_warning(sb, __func__,
309 "updating to rev %d because of new feature flag, "
310 "running e2fsck is recommended",
311 EXT3_DYNAMIC_REV);
312
313 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
314 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
315 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
316 /* leave es->s_feature_*compat flags alone */
317 /* es->s_uuid will be set by e2fsck if empty */
318
319 /*
320 * The rest of the superblock fields should be zero, and if not it
321 * means they are likely already in use, so leave them alone. We
322 * can leave it up to e2fsck to clean up any inconsistencies there.
323 */
324 }
325
326 /*
327 * Open the external journal device
328 */
329 static struct block_device *ext3_blkdev_get(dev_t dev)
330 {
331 struct block_device *bdev;
332 char b[BDEVNAME_SIZE];
333
334 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
335 if (IS_ERR(bdev))
336 goto fail;
337 return bdev;
338
339 fail:
340 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
341 __bdevname(dev, b), PTR_ERR(bdev));
342 return NULL;
343 }
344
345 /*
346 * Release the journal device
347 */
348 static int ext3_blkdev_put(struct block_device *bdev)
349 {
350 bd_release(bdev);
351 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
352 }
353
354 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
355 {
356 struct block_device *bdev;
357 int ret = -ENODEV;
358
359 bdev = sbi->journal_bdev;
360 if (bdev) {
361 ret = ext3_blkdev_put(bdev);
362 sbi->journal_bdev = NULL;
363 }
364 return ret;
365 }
366
367 static inline struct inode *orphan_list_entry(struct list_head *l)
368 {
369 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
370 }
371
372 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
373 {
374 struct list_head *l;
375
376 printk(KERN_ERR "sb orphan head is %d\n",
377 le32_to_cpu(sbi->s_es->s_last_orphan));
378
379 printk(KERN_ERR "sb_info orphan list:\n");
380 list_for_each(l, &sbi->s_orphan) {
381 struct inode *inode = orphan_list_entry(l);
382 printk(KERN_ERR " "
383 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
384 inode->i_sb->s_id, inode->i_ino, inode,
385 inode->i_mode, inode->i_nlink,
386 NEXT_ORPHAN(inode));
387 }
388 }
389
390 static void ext3_put_super (struct super_block * sb)
391 {
392 struct ext3_sb_info *sbi = EXT3_SB(sb);
393 struct ext3_super_block *es = sbi->s_es;
394 int i, err;
395
396 ext3_xattr_put_super(sb);
397 err = journal_destroy(sbi->s_journal);
398 sbi->s_journal = NULL;
399 if (err < 0)
400 ext3_abort(sb, __func__, "Couldn't clean up the journal");
401
402 if (!(sb->s_flags & MS_RDONLY)) {
403 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
404 es->s_state = cpu_to_le16(sbi->s_mount_state);
405 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
406 mark_buffer_dirty(sbi->s_sbh);
407 ext3_commit_super(sb, es, 1);
408 }
409
410 for (i = 0; i < sbi->s_gdb_count; i++)
411 brelse(sbi->s_group_desc[i]);
412 kfree(sbi->s_group_desc);
413 percpu_counter_destroy(&sbi->s_freeblocks_counter);
414 percpu_counter_destroy(&sbi->s_freeinodes_counter);
415 percpu_counter_destroy(&sbi->s_dirs_counter);
416 brelse(sbi->s_sbh);
417 #ifdef CONFIG_QUOTA
418 for (i = 0; i < MAXQUOTAS; i++)
419 kfree(sbi->s_qf_names[i]);
420 #endif
421
422 /* Debugging code just in case the in-memory inode orphan list
423 * isn't empty. The on-disk one can be non-empty if we've
424 * detected an error and taken the fs readonly, but the
425 * in-memory list had better be clean by this point. */
426 if (!list_empty(&sbi->s_orphan))
427 dump_orphan_list(sb, sbi);
428 J_ASSERT(list_empty(&sbi->s_orphan));
429
430 invalidate_bdev(sb->s_bdev);
431 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
432 /*
433 * Invalidate the journal device's buffers. We don't want them
434 * floating about in memory - the physical journal device may
435 * hotswapped, and it breaks the `ro-after' testing code.
436 */
437 sync_blockdev(sbi->journal_bdev);
438 invalidate_bdev(sbi->journal_bdev);
439 ext3_blkdev_remove(sbi);
440 }
441 sb->s_fs_info = NULL;
442 kfree(sbi->s_blockgroup_lock);
443 kfree(sbi);
444 return;
445 }
446
447 static struct kmem_cache *ext3_inode_cachep;
448
449 /*
450 * Called inside transaction, so use GFP_NOFS
451 */
452 static struct inode *ext3_alloc_inode(struct super_block *sb)
453 {
454 struct ext3_inode_info *ei;
455
456 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
457 if (!ei)
458 return NULL;
459 #ifdef CONFIG_EXT3_FS_POSIX_ACL
460 ei->i_acl = EXT3_ACL_NOT_CACHED;
461 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
462 #endif
463 ei->i_block_alloc_info = NULL;
464 ei->vfs_inode.i_version = 1;
465 return &ei->vfs_inode;
466 }
467
468 static void ext3_destroy_inode(struct inode *inode)
469 {
470 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
471 printk("EXT3 Inode %p: orphan list check failed!\n",
472 EXT3_I(inode));
473 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
474 EXT3_I(inode), sizeof(struct ext3_inode_info),
475 false);
476 dump_stack();
477 }
478 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
479 }
480
481 static void init_once(void *foo)
482 {
483 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
484
485 INIT_LIST_HEAD(&ei->i_orphan);
486 #ifdef CONFIG_EXT3_FS_XATTR
487 init_rwsem(&ei->xattr_sem);
488 #endif
489 mutex_init(&ei->truncate_mutex);
490 inode_init_once(&ei->vfs_inode);
491 }
492
493 static int init_inodecache(void)
494 {
495 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
496 sizeof(struct ext3_inode_info),
497 0, (SLAB_RECLAIM_ACCOUNT|
498 SLAB_MEM_SPREAD),
499 init_once);
500 if (ext3_inode_cachep == NULL)
501 return -ENOMEM;
502 return 0;
503 }
504
505 static void destroy_inodecache(void)
506 {
507 kmem_cache_destroy(ext3_inode_cachep);
508 }
509
510 static void ext3_clear_inode(struct inode *inode)
511 {
512 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
513 #ifdef CONFIG_EXT3_FS_POSIX_ACL
514 if (EXT3_I(inode)->i_acl &&
515 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
516 posix_acl_release(EXT3_I(inode)->i_acl);
517 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
518 }
519 if (EXT3_I(inode)->i_default_acl &&
520 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
521 posix_acl_release(EXT3_I(inode)->i_default_acl);
522 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
523 }
524 #endif
525 ext3_discard_reservation(inode);
526 EXT3_I(inode)->i_block_alloc_info = NULL;
527 if (unlikely(rsv))
528 kfree(rsv);
529 }
530
531 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
532 {
533 #if defined(CONFIG_QUOTA)
534 struct ext3_sb_info *sbi = EXT3_SB(sb);
535
536 if (sbi->s_jquota_fmt)
537 seq_printf(seq, ",jqfmt=%s",
538 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
539
540 if (sbi->s_qf_names[USRQUOTA])
541 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
542
543 if (sbi->s_qf_names[GRPQUOTA])
544 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
545
546 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
547 seq_puts(seq, ",usrquota");
548
549 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
550 seq_puts(seq, ",grpquota");
551 #endif
552 }
553
554 /*
555 * Show an option if
556 * - it's set to a non-default value OR
557 * - if the per-sb default is different from the global default
558 */
559 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
560 {
561 struct super_block *sb = vfs->mnt_sb;
562 struct ext3_sb_info *sbi = EXT3_SB(sb);
563 struct ext3_super_block *es = sbi->s_es;
564 unsigned long def_mount_opts;
565
566 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
567
568 if (sbi->s_sb_block != 1)
569 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
570 if (test_opt(sb, MINIX_DF))
571 seq_puts(seq, ",minixdf");
572 if (test_opt(sb, GRPID))
573 seq_puts(seq, ",grpid");
574 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
575 seq_puts(seq, ",nogrpid");
576 if (sbi->s_resuid != EXT3_DEF_RESUID ||
577 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
578 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
579 }
580 if (sbi->s_resgid != EXT3_DEF_RESGID ||
581 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
582 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
583 }
584 if (test_opt(sb, ERRORS_RO)) {
585 int def_errors = le16_to_cpu(es->s_errors);
586
587 if (def_errors == EXT3_ERRORS_PANIC ||
588 def_errors == EXT3_ERRORS_CONTINUE) {
589 seq_puts(seq, ",errors=remount-ro");
590 }
591 }
592 if (test_opt(sb, ERRORS_CONT))
593 seq_puts(seq, ",errors=continue");
594 if (test_opt(sb, ERRORS_PANIC))
595 seq_puts(seq, ",errors=panic");
596 if (test_opt(sb, NO_UID32))
597 seq_puts(seq, ",nouid32");
598 if (test_opt(sb, DEBUG))
599 seq_puts(seq, ",debug");
600 if (test_opt(sb, OLDALLOC))
601 seq_puts(seq, ",oldalloc");
602 #ifdef CONFIG_EXT3_FS_XATTR
603 if (test_opt(sb, XATTR_USER))
604 seq_puts(seq, ",user_xattr");
605 if (!test_opt(sb, XATTR_USER) &&
606 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
607 seq_puts(seq, ",nouser_xattr");
608 }
609 #endif
610 #ifdef CONFIG_EXT3_FS_POSIX_ACL
611 if (test_opt(sb, POSIX_ACL))
612 seq_puts(seq, ",acl");
613 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
614 seq_puts(seq, ",noacl");
615 #endif
616 if (!test_opt(sb, RESERVATION))
617 seq_puts(seq, ",noreservation");
618 if (sbi->s_commit_interval) {
619 seq_printf(seq, ",commit=%u",
620 (unsigned) (sbi->s_commit_interval / HZ));
621 }
622 if (test_opt(sb, BARRIER))
623 seq_puts(seq, ",barrier=1");
624 if (test_opt(sb, NOBH))
625 seq_puts(seq, ",nobh");
626
627 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
628 seq_puts(seq, ",data=journal");
629 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
630 seq_puts(seq, ",data=ordered");
631 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
632 seq_puts(seq, ",data=writeback");
633
634 if (test_opt(sb, DATA_ERR_ABORT))
635 seq_puts(seq, ",data_err=abort");
636
637 ext3_show_quota_options(seq, sb);
638
639 return 0;
640 }
641
642
643 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
644 u64 ino, u32 generation)
645 {
646 struct inode *inode;
647
648 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
649 return ERR_PTR(-ESTALE);
650 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
651 return ERR_PTR(-ESTALE);
652
653 /* iget isn't really right if the inode is currently unallocated!!
654 *
655 * ext3_read_inode will return a bad_inode if the inode had been
656 * deleted, so we should be safe.
657 *
658 * Currently we don't know the generation for parent directory, so
659 * a generation of 0 means "accept any"
660 */
661 inode = ext3_iget(sb, ino);
662 if (IS_ERR(inode))
663 return ERR_CAST(inode);
664 if (generation && inode->i_generation != generation) {
665 iput(inode);
666 return ERR_PTR(-ESTALE);
667 }
668
669 return inode;
670 }
671
672 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
673 int fh_len, int fh_type)
674 {
675 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
676 ext3_nfs_get_inode);
677 }
678
679 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
680 int fh_len, int fh_type)
681 {
682 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
683 ext3_nfs_get_inode);
684 }
685
686 #ifdef CONFIG_QUOTA
687 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
688 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
689
690 static int ext3_dquot_initialize(struct inode *inode, int type);
691 static int ext3_dquot_drop(struct inode *inode);
692 static int ext3_write_dquot(struct dquot *dquot);
693 static int ext3_acquire_dquot(struct dquot *dquot);
694 static int ext3_release_dquot(struct dquot *dquot);
695 static int ext3_mark_dquot_dirty(struct dquot *dquot);
696 static int ext3_write_info(struct super_block *sb, int type);
697 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
698 char *path, int remount);
699 static int ext3_quota_on_mount(struct super_block *sb, int type);
700 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
701 size_t len, loff_t off);
702 static ssize_t ext3_quota_write(struct super_block *sb, int type,
703 const char *data, size_t len, loff_t off);
704
705 static struct dquot_operations ext3_quota_operations = {
706 .initialize = ext3_dquot_initialize,
707 .drop = ext3_dquot_drop,
708 .alloc_space = dquot_alloc_space,
709 .alloc_inode = dquot_alloc_inode,
710 .free_space = dquot_free_space,
711 .free_inode = dquot_free_inode,
712 .transfer = dquot_transfer,
713 .write_dquot = ext3_write_dquot,
714 .acquire_dquot = ext3_acquire_dquot,
715 .release_dquot = ext3_release_dquot,
716 .mark_dirty = ext3_mark_dquot_dirty,
717 .write_info = ext3_write_info,
718 .alloc_dquot = dquot_alloc,
719 .destroy_dquot = dquot_destroy,
720 };
721
722 static struct quotactl_ops ext3_qctl_operations = {
723 .quota_on = ext3_quota_on,
724 .quota_off = vfs_quota_off,
725 .quota_sync = vfs_quota_sync,
726 .get_info = vfs_get_dqinfo,
727 .set_info = vfs_set_dqinfo,
728 .get_dqblk = vfs_get_dqblk,
729 .set_dqblk = vfs_set_dqblk
730 };
731 #endif
732
733 static const struct super_operations ext3_sops = {
734 .alloc_inode = ext3_alloc_inode,
735 .destroy_inode = ext3_destroy_inode,
736 .write_inode = ext3_write_inode,
737 .dirty_inode = ext3_dirty_inode,
738 .delete_inode = ext3_delete_inode,
739 .put_super = ext3_put_super,
740 .write_super = ext3_write_super,
741 .sync_fs = ext3_sync_fs,
742 .write_super_lockfs = ext3_write_super_lockfs,
743 .unlockfs = ext3_unlockfs,
744 .statfs = ext3_statfs,
745 .remount_fs = ext3_remount,
746 .clear_inode = ext3_clear_inode,
747 .show_options = ext3_show_options,
748 #ifdef CONFIG_QUOTA
749 .quota_read = ext3_quota_read,
750 .quota_write = ext3_quota_write,
751 #endif
752 };
753
754 static const struct export_operations ext3_export_ops = {
755 .fh_to_dentry = ext3_fh_to_dentry,
756 .fh_to_parent = ext3_fh_to_parent,
757 .get_parent = ext3_get_parent,
758 };
759
760 enum {
761 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
762 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
763 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
764 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
765 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
766 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
767 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
768 Opt_data_err_abort, Opt_data_err_ignore,
769 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
770 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
771 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
772 Opt_grpquota
773 };
774
775 static const match_table_t tokens = {
776 {Opt_bsd_df, "bsddf"},
777 {Opt_minix_df, "minixdf"},
778 {Opt_grpid, "grpid"},
779 {Opt_grpid, "bsdgroups"},
780 {Opt_nogrpid, "nogrpid"},
781 {Opt_nogrpid, "sysvgroups"},
782 {Opt_resgid, "resgid=%u"},
783 {Opt_resuid, "resuid=%u"},
784 {Opt_sb, "sb=%u"},
785 {Opt_err_cont, "errors=continue"},
786 {Opt_err_panic, "errors=panic"},
787 {Opt_err_ro, "errors=remount-ro"},
788 {Opt_nouid32, "nouid32"},
789 {Opt_nocheck, "nocheck"},
790 {Opt_nocheck, "check=none"},
791 {Opt_debug, "debug"},
792 {Opt_oldalloc, "oldalloc"},
793 {Opt_orlov, "orlov"},
794 {Opt_user_xattr, "user_xattr"},
795 {Opt_nouser_xattr, "nouser_xattr"},
796 {Opt_acl, "acl"},
797 {Opt_noacl, "noacl"},
798 {Opt_reservation, "reservation"},
799 {Opt_noreservation, "noreservation"},
800 {Opt_noload, "noload"},
801 {Opt_nobh, "nobh"},
802 {Opt_bh, "bh"},
803 {Opt_commit, "commit=%u"},
804 {Opt_journal_update, "journal=update"},
805 {Opt_journal_inum, "journal=%u"},
806 {Opt_journal_dev, "journal_dev=%u"},
807 {Opt_abort, "abort"},
808 {Opt_data_journal, "data=journal"},
809 {Opt_data_ordered, "data=ordered"},
810 {Opt_data_writeback, "data=writeback"},
811 {Opt_data_err_abort, "data_err=abort"},
812 {Opt_data_err_ignore, "data_err=ignore"},
813 {Opt_offusrjquota, "usrjquota="},
814 {Opt_usrjquota, "usrjquota=%s"},
815 {Opt_offgrpjquota, "grpjquota="},
816 {Opt_grpjquota, "grpjquota=%s"},
817 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
818 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
819 {Opt_grpquota, "grpquota"},
820 {Opt_noquota, "noquota"},
821 {Opt_quota, "quota"},
822 {Opt_usrquota, "usrquota"},
823 {Opt_barrier, "barrier=%u"},
824 {Opt_resize, "resize"},
825 {Opt_err, NULL},
826 };
827
828 static ext3_fsblk_t get_sb_block(void **data)
829 {
830 ext3_fsblk_t sb_block;
831 char *options = (char *) *data;
832
833 if (!options || strncmp(options, "sb=", 3) != 0)
834 return 1; /* Default location */
835 options += 3;
836 /*todo: use simple_strtoll with >32bit ext3 */
837 sb_block = simple_strtoul(options, &options, 0);
838 if (*options && *options != ',') {
839 printk("EXT3-fs: Invalid sb specification: %s\n",
840 (char *) *data);
841 return 1;
842 }
843 if (*options == ',')
844 options++;
845 *data = (void *) options;
846 return sb_block;
847 }
848
849 static int parse_options (char *options, struct super_block *sb,
850 unsigned int *inum, unsigned long *journal_devnum,
851 ext3_fsblk_t *n_blocks_count, int is_remount)
852 {
853 struct ext3_sb_info *sbi = EXT3_SB(sb);
854 char * p;
855 substring_t args[MAX_OPT_ARGS];
856 int data_opt = 0;
857 int option;
858 #ifdef CONFIG_QUOTA
859 int qtype, qfmt;
860 char *qname;
861 #endif
862
863 if (!options)
864 return 1;
865
866 while ((p = strsep (&options, ",")) != NULL) {
867 int token;
868 if (!*p)
869 continue;
870
871 token = match_token(p, tokens, args);
872 switch (token) {
873 case Opt_bsd_df:
874 clear_opt (sbi->s_mount_opt, MINIX_DF);
875 break;
876 case Opt_minix_df:
877 set_opt (sbi->s_mount_opt, MINIX_DF);
878 break;
879 case Opt_grpid:
880 set_opt (sbi->s_mount_opt, GRPID);
881 break;
882 case Opt_nogrpid:
883 clear_opt (sbi->s_mount_opt, GRPID);
884 break;
885 case Opt_resuid:
886 if (match_int(&args[0], &option))
887 return 0;
888 sbi->s_resuid = option;
889 break;
890 case Opt_resgid:
891 if (match_int(&args[0], &option))
892 return 0;
893 sbi->s_resgid = option;
894 break;
895 case Opt_sb:
896 /* handled by get_sb_block() instead of here */
897 /* *sb_block = match_int(&args[0]); */
898 break;
899 case Opt_err_panic:
900 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
901 clear_opt (sbi->s_mount_opt, ERRORS_RO);
902 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
903 break;
904 case Opt_err_ro:
905 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
906 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
907 set_opt (sbi->s_mount_opt, ERRORS_RO);
908 break;
909 case Opt_err_cont:
910 clear_opt (sbi->s_mount_opt, ERRORS_RO);
911 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
912 set_opt (sbi->s_mount_opt, ERRORS_CONT);
913 break;
914 case Opt_nouid32:
915 set_opt (sbi->s_mount_opt, NO_UID32);
916 break;
917 case Opt_nocheck:
918 clear_opt (sbi->s_mount_opt, CHECK);
919 break;
920 case Opt_debug:
921 set_opt (sbi->s_mount_opt, DEBUG);
922 break;
923 case Opt_oldalloc:
924 set_opt (sbi->s_mount_opt, OLDALLOC);
925 break;
926 case Opt_orlov:
927 clear_opt (sbi->s_mount_opt, OLDALLOC);
928 break;
929 #ifdef CONFIG_EXT3_FS_XATTR
930 case Opt_user_xattr:
931 set_opt (sbi->s_mount_opt, XATTR_USER);
932 break;
933 case Opt_nouser_xattr:
934 clear_opt (sbi->s_mount_opt, XATTR_USER);
935 break;
936 #else
937 case Opt_user_xattr:
938 case Opt_nouser_xattr:
939 printk("EXT3 (no)user_xattr options not supported\n");
940 break;
941 #endif
942 #ifdef CONFIG_EXT3_FS_POSIX_ACL
943 case Opt_acl:
944 set_opt(sbi->s_mount_opt, POSIX_ACL);
945 break;
946 case Opt_noacl:
947 clear_opt(sbi->s_mount_opt, POSIX_ACL);
948 break;
949 #else
950 case Opt_acl:
951 case Opt_noacl:
952 printk("EXT3 (no)acl options not supported\n");
953 break;
954 #endif
955 case Opt_reservation:
956 set_opt(sbi->s_mount_opt, RESERVATION);
957 break;
958 case Opt_noreservation:
959 clear_opt(sbi->s_mount_opt, RESERVATION);
960 break;
961 case Opt_journal_update:
962 /* @@@ FIXME */
963 /* Eventually we will want to be able to create
964 a journal file here. For now, only allow the
965 user to specify an existing inode to be the
966 journal file. */
967 if (is_remount) {
968 printk(KERN_ERR "EXT3-fs: cannot specify "
969 "journal on remount\n");
970 return 0;
971 }
972 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
973 break;
974 case Opt_journal_inum:
975 if (is_remount) {
976 printk(KERN_ERR "EXT3-fs: cannot specify "
977 "journal on remount\n");
978 return 0;
979 }
980 if (match_int(&args[0], &option))
981 return 0;
982 *inum = option;
983 break;
984 case Opt_journal_dev:
985 if (is_remount) {
986 printk(KERN_ERR "EXT3-fs: cannot specify "
987 "journal on remount\n");
988 return 0;
989 }
990 if (match_int(&args[0], &option))
991 return 0;
992 *journal_devnum = option;
993 break;
994 case Opt_noload:
995 set_opt (sbi->s_mount_opt, NOLOAD);
996 break;
997 case Opt_commit:
998 if (match_int(&args[0], &option))
999 return 0;
1000 if (option < 0)
1001 return 0;
1002 if (option == 0)
1003 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1004 sbi->s_commit_interval = HZ * option;
1005 break;
1006 case Opt_data_journal:
1007 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1008 goto datacheck;
1009 case Opt_data_ordered:
1010 data_opt = EXT3_MOUNT_ORDERED_DATA;
1011 goto datacheck;
1012 case Opt_data_writeback:
1013 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1014 datacheck:
1015 if (is_remount) {
1016 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1017 != data_opt) {
1018 printk(KERN_ERR
1019 "EXT3-fs: cannot change data "
1020 "mode on remount\n");
1021 return 0;
1022 }
1023 } else {
1024 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1025 sbi->s_mount_opt |= data_opt;
1026 }
1027 break;
1028 case Opt_data_err_abort:
1029 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1030 break;
1031 case Opt_data_err_ignore:
1032 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1033 break;
1034 #ifdef CONFIG_QUOTA
1035 case Opt_usrjquota:
1036 qtype = USRQUOTA;
1037 goto set_qf_name;
1038 case Opt_grpjquota:
1039 qtype = GRPQUOTA;
1040 set_qf_name:
1041 if (sb_any_quota_loaded(sb) &&
1042 !sbi->s_qf_names[qtype]) {
1043 printk(KERN_ERR
1044 "EXT3-fs: Cannot change journaled "
1045 "quota options when quota turned on.\n");
1046 return 0;
1047 }
1048 qname = match_strdup(&args[0]);
1049 if (!qname) {
1050 printk(KERN_ERR
1051 "EXT3-fs: not enough memory for "
1052 "storing quotafile name.\n");
1053 return 0;
1054 }
1055 if (sbi->s_qf_names[qtype] &&
1056 strcmp(sbi->s_qf_names[qtype], qname)) {
1057 printk(KERN_ERR
1058 "EXT3-fs: %s quota file already "
1059 "specified.\n", QTYPE2NAME(qtype));
1060 kfree(qname);
1061 return 0;
1062 }
1063 sbi->s_qf_names[qtype] = qname;
1064 if (strchr(sbi->s_qf_names[qtype], '/')) {
1065 printk(KERN_ERR
1066 "EXT3-fs: quotafile must be on "
1067 "filesystem root.\n");
1068 kfree(sbi->s_qf_names[qtype]);
1069 sbi->s_qf_names[qtype] = NULL;
1070 return 0;
1071 }
1072 set_opt(sbi->s_mount_opt, QUOTA);
1073 break;
1074 case Opt_offusrjquota:
1075 qtype = USRQUOTA;
1076 goto clear_qf_name;
1077 case Opt_offgrpjquota:
1078 qtype = GRPQUOTA;
1079 clear_qf_name:
1080 if (sb_any_quota_loaded(sb) &&
1081 sbi->s_qf_names[qtype]) {
1082 printk(KERN_ERR "EXT3-fs: Cannot change "
1083 "journaled quota options when "
1084 "quota turned on.\n");
1085 return 0;
1086 }
1087 /*
1088 * The space will be released later when all options
1089 * are confirmed to be correct
1090 */
1091 sbi->s_qf_names[qtype] = NULL;
1092 break;
1093 case Opt_jqfmt_vfsold:
1094 qfmt = QFMT_VFS_OLD;
1095 goto set_qf_format;
1096 case Opt_jqfmt_vfsv0:
1097 qfmt = QFMT_VFS_V0;
1098 set_qf_format:
1099 if (sb_any_quota_loaded(sb) &&
1100 sbi->s_jquota_fmt != qfmt) {
1101 printk(KERN_ERR "EXT3-fs: Cannot change "
1102 "journaled quota options when "
1103 "quota turned on.\n");
1104 return 0;
1105 }
1106 sbi->s_jquota_fmt = qfmt;
1107 break;
1108 case Opt_quota:
1109 case Opt_usrquota:
1110 set_opt(sbi->s_mount_opt, QUOTA);
1111 set_opt(sbi->s_mount_opt, USRQUOTA);
1112 break;
1113 case Opt_grpquota:
1114 set_opt(sbi->s_mount_opt, QUOTA);
1115 set_opt(sbi->s_mount_opt, GRPQUOTA);
1116 break;
1117 case Opt_noquota:
1118 if (sb_any_quota_loaded(sb)) {
1119 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1120 "options when quota turned on.\n");
1121 return 0;
1122 }
1123 clear_opt(sbi->s_mount_opt, QUOTA);
1124 clear_opt(sbi->s_mount_opt, USRQUOTA);
1125 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1126 break;
1127 #else
1128 case Opt_quota:
1129 case Opt_usrquota:
1130 case Opt_grpquota:
1131 printk(KERN_ERR
1132 "EXT3-fs: quota options not supported.\n");
1133 break;
1134 case Opt_usrjquota:
1135 case Opt_grpjquota:
1136 case Opt_offusrjquota:
1137 case Opt_offgrpjquota:
1138 case Opt_jqfmt_vfsold:
1139 case Opt_jqfmt_vfsv0:
1140 printk(KERN_ERR
1141 "EXT3-fs: journaled quota options not "
1142 "supported.\n");
1143 break;
1144 case Opt_noquota:
1145 break;
1146 #endif
1147 case Opt_abort:
1148 set_opt(sbi->s_mount_opt, ABORT);
1149 break;
1150 case Opt_barrier:
1151 if (match_int(&args[0], &option))
1152 return 0;
1153 if (option)
1154 set_opt(sbi->s_mount_opt, BARRIER);
1155 else
1156 clear_opt(sbi->s_mount_opt, BARRIER);
1157 break;
1158 case Opt_ignore:
1159 break;
1160 case Opt_resize:
1161 if (!is_remount) {
1162 printk("EXT3-fs: resize option only available "
1163 "for remount\n");
1164 return 0;
1165 }
1166 if (match_int(&args[0], &option) != 0)
1167 return 0;
1168 *n_blocks_count = option;
1169 break;
1170 case Opt_nobh:
1171 set_opt(sbi->s_mount_opt, NOBH);
1172 break;
1173 case Opt_bh:
1174 clear_opt(sbi->s_mount_opt, NOBH);
1175 break;
1176 default:
1177 printk (KERN_ERR
1178 "EXT3-fs: Unrecognized mount option \"%s\" "
1179 "or missing value\n", p);
1180 return 0;
1181 }
1182 }
1183 #ifdef CONFIG_QUOTA
1184 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1185 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1186 sbi->s_qf_names[USRQUOTA])
1187 clear_opt(sbi->s_mount_opt, USRQUOTA);
1188
1189 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1190 sbi->s_qf_names[GRPQUOTA])
1191 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1192
1193 if ((sbi->s_qf_names[USRQUOTA] &&
1194 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1195 (sbi->s_qf_names[GRPQUOTA] &&
1196 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1197 printk(KERN_ERR "EXT3-fs: old and new quota "
1198 "format mixing.\n");
1199 return 0;
1200 }
1201
1202 if (!sbi->s_jquota_fmt) {
1203 printk(KERN_ERR "EXT3-fs: journaled quota format "
1204 "not specified.\n");
1205 return 0;
1206 }
1207 } else {
1208 if (sbi->s_jquota_fmt) {
1209 printk(KERN_ERR "EXT3-fs: journaled quota format "
1210 "specified with no journaling "
1211 "enabled.\n");
1212 return 0;
1213 }
1214 }
1215 #endif
1216 return 1;
1217 }
1218
1219 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1220 int read_only)
1221 {
1222 struct ext3_sb_info *sbi = EXT3_SB(sb);
1223 int res = 0;
1224
1225 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1226 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1227 "forcing read-only mode\n");
1228 res = MS_RDONLY;
1229 }
1230 if (read_only)
1231 return res;
1232 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1233 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1234 "running e2fsck is recommended\n");
1235 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1236 printk (KERN_WARNING
1237 "EXT3-fs warning: mounting fs with errors, "
1238 "running e2fsck is recommended\n");
1239 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1240 le16_to_cpu(es->s_mnt_count) >=
1241 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1242 printk (KERN_WARNING
1243 "EXT3-fs warning: maximal mount count reached, "
1244 "running e2fsck is recommended\n");
1245 else if (le32_to_cpu(es->s_checkinterval) &&
1246 (le32_to_cpu(es->s_lastcheck) +
1247 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1248 printk (KERN_WARNING
1249 "EXT3-fs warning: checktime reached, "
1250 "running e2fsck is recommended\n");
1251 #if 0
1252 /* @@@ We _will_ want to clear the valid bit if we find
1253 inconsistencies, to force a fsck at reboot. But for
1254 a plain journaled filesystem we can keep it set as
1255 valid forever! :) */
1256 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1257 #endif
1258 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1259 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1260 le16_add_cpu(&es->s_mnt_count, 1);
1261 es->s_mtime = cpu_to_le32(get_seconds());
1262 ext3_update_dynamic_rev(sb);
1263 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1264
1265 ext3_commit_super(sb, es, 1);
1266 if (test_opt(sb, DEBUG))
1267 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1268 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1269 sb->s_blocksize,
1270 sbi->s_groups_count,
1271 EXT3_BLOCKS_PER_GROUP(sb),
1272 EXT3_INODES_PER_GROUP(sb),
1273 sbi->s_mount_opt);
1274
1275 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1276 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1277 char b[BDEVNAME_SIZE];
1278
1279 printk("external journal on %s\n",
1280 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1281 } else {
1282 printk("internal journal\n");
1283 }
1284 return res;
1285 }
1286
1287 /* Called at mount-time, super-block is locked */
1288 static int ext3_check_descriptors(struct super_block *sb)
1289 {
1290 struct ext3_sb_info *sbi = EXT3_SB(sb);
1291 int i;
1292
1293 ext3_debug ("Checking group descriptors");
1294
1295 for (i = 0; i < sbi->s_groups_count; i++) {
1296 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1297 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1298 ext3_fsblk_t last_block;
1299
1300 if (i == sbi->s_groups_count - 1)
1301 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1302 else
1303 last_block = first_block +
1304 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1305
1306 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1307 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1308 {
1309 ext3_error (sb, "ext3_check_descriptors",
1310 "Block bitmap for group %d"
1311 " not in group (block %lu)!",
1312 i, (unsigned long)
1313 le32_to_cpu(gdp->bg_block_bitmap));
1314 return 0;
1315 }
1316 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1317 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1318 {
1319 ext3_error (sb, "ext3_check_descriptors",
1320 "Inode bitmap for group %d"
1321 " not in group (block %lu)!",
1322 i, (unsigned long)
1323 le32_to_cpu(gdp->bg_inode_bitmap));
1324 return 0;
1325 }
1326 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1327 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1328 last_block)
1329 {
1330 ext3_error (sb, "ext3_check_descriptors",
1331 "Inode table for group %d"
1332 " not in group (block %lu)!",
1333 i, (unsigned long)
1334 le32_to_cpu(gdp->bg_inode_table));
1335 return 0;
1336 }
1337 }
1338
1339 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1340 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1341 return 1;
1342 }
1343
1344
1345 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1346 * the superblock) which were deleted from all directories, but held open by
1347 * a process at the time of a crash. We walk the list and try to delete these
1348 * inodes at recovery time (only with a read-write filesystem).
1349 *
1350 * In order to keep the orphan inode chain consistent during traversal (in
1351 * case of crash during recovery), we link each inode into the superblock
1352 * orphan list_head and handle it the same way as an inode deletion during
1353 * normal operation (which journals the operations for us).
1354 *
1355 * We only do an iget() and an iput() on each inode, which is very safe if we
1356 * accidentally point at an in-use or already deleted inode. The worst that
1357 * can happen in this case is that we get a "bit already cleared" message from
1358 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1359 * e2fsck was run on this filesystem, and it must have already done the orphan
1360 * inode cleanup for us, so we can safely abort without any further action.
1361 */
1362 static void ext3_orphan_cleanup (struct super_block * sb,
1363 struct ext3_super_block * es)
1364 {
1365 unsigned int s_flags = sb->s_flags;
1366 int nr_orphans = 0, nr_truncates = 0;
1367 #ifdef CONFIG_QUOTA
1368 int i;
1369 #endif
1370 if (!es->s_last_orphan) {
1371 jbd_debug(4, "no orphan inodes to clean up\n");
1372 return;
1373 }
1374
1375 if (bdev_read_only(sb->s_bdev)) {
1376 printk(KERN_ERR "EXT3-fs: write access "
1377 "unavailable, skipping orphan cleanup.\n");
1378 return;
1379 }
1380
1381 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1382 if (es->s_last_orphan)
1383 jbd_debug(1, "Errors on filesystem, "
1384 "clearing orphan list.\n");
1385 es->s_last_orphan = 0;
1386 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1387 return;
1388 }
1389
1390 if (s_flags & MS_RDONLY) {
1391 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1392 sb->s_id);
1393 sb->s_flags &= ~MS_RDONLY;
1394 }
1395 #ifdef CONFIG_QUOTA
1396 /* Needed for iput() to work correctly and not trash data */
1397 sb->s_flags |= MS_ACTIVE;
1398 /* Turn on quotas so that they are updated correctly */
1399 for (i = 0; i < MAXQUOTAS; i++) {
1400 if (EXT3_SB(sb)->s_qf_names[i]) {
1401 int ret = ext3_quota_on_mount(sb, i);
1402 if (ret < 0)
1403 printk(KERN_ERR
1404 "EXT3-fs: Cannot turn on journaled "
1405 "quota: error %d\n", ret);
1406 }
1407 }
1408 #endif
1409
1410 while (es->s_last_orphan) {
1411 struct inode *inode;
1412
1413 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1414 if (IS_ERR(inode)) {
1415 es->s_last_orphan = 0;
1416 break;
1417 }
1418
1419 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1420 DQUOT_INIT(inode);
1421 if (inode->i_nlink) {
1422 printk(KERN_DEBUG
1423 "%s: truncating inode %lu to %Ld bytes\n",
1424 __func__, inode->i_ino, inode->i_size);
1425 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1426 inode->i_ino, inode->i_size);
1427 ext3_truncate(inode);
1428 nr_truncates++;
1429 } else {
1430 printk(KERN_DEBUG
1431 "%s: deleting unreferenced inode %lu\n",
1432 __func__, inode->i_ino);
1433 jbd_debug(2, "deleting unreferenced inode %lu\n",
1434 inode->i_ino);
1435 nr_orphans++;
1436 }
1437 iput(inode); /* The delete magic happens here! */
1438 }
1439
1440 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1441
1442 if (nr_orphans)
1443 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1444 sb->s_id, PLURAL(nr_orphans));
1445 if (nr_truncates)
1446 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1447 sb->s_id, PLURAL(nr_truncates));
1448 #ifdef CONFIG_QUOTA
1449 /* Turn quotas off */
1450 for (i = 0; i < MAXQUOTAS; i++) {
1451 if (sb_dqopt(sb)->files[i])
1452 vfs_quota_off(sb, i, 0);
1453 }
1454 #endif
1455 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1456 }
1457
1458 /*
1459 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1460 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1461 * We need to be 1 filesystem block less than the 2^32 sector limit.
1462 */
1463 static loff_t ext3_max_size(int bits)
1464 {
1465 loff_t res = EXT3_NDIR_BLOCKS;
1466 int meta_blocks;
1467 loff_t upper_limit;
1468
1469 /* This is calculated to be the largest file size for a
1470 * dense, file such that the total number of
1471 * sectors in the file, including data and all indirect blocks,
1472 * does not exceed 2^32 -1
1473 * __u32 i_blocks representing the total number of
1474 * 512 bytes blocks of the file
1475 */
1476 upper_limit = (1LL << 32) - 1;
1477
1478 /* total blocks in file system block size */
1479 upper_limit >>= (bits - 9);
1480
1481
1482 /* indirect blocks */
1483 meta_blocks = 1;
1484 /* double indirect blocks */
1485 meta_blocks += 1 + (1LL << (bits-2));
1486 /* tripple indirect blocks */
1487 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1488
1489 upper_limit -= meta_blocks;
1490 upper_limit <<= bits;
1491
1492 res += 1LL << (bits-2);
1493 res += 1LL << (2*(bits-2));
1494 res += 1LL << (3*(bits-2));
1495 res <<= bits;
1496 if (res > upper_limit)
1497 res = upper_limit;
1498
1499 if (res > MAX_LFS_FILESIZE)
1500 res = MAX_LFS_FILESIZE;
1501
1502 return res;
1503 }
1504
1505 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1506 ext3_fsblk_t logic_sb_block,
1507 int nr)
1508 {
1509 struct ext3_sb_info *sbi = EXT3_SB(sb);
1510 unsigned long bg, first_meta_bg;
1511 int has_super = 0;
1512
1513 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1514
1515 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1516 nr < first_meta_bg)
1517 return (logic_sb_block + nr + 1);
1518 bg = sbi->s_desc_per_block * nr;
1519 if (ext3_bg_has_super(sb, bg))
1520 has_super = 1;
1521 return (has_super + ext3_group_first_block_no(sb, bg));
1522 }
1523
1524
1525 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1526 {
1527 struct buffer_head * bh;
1528 struct ext3_super_block *es = NULL;
1529 struct ext3_sb_info *sbi;
1530 ext3_fsblk_t block;
1531 ext3_fsblk_t sb_block = get_sb_block(&data);
1532 ext3_fsblk_t logic_sb_block;
1533 unsigned long offset = 0;
1534 unsigned int journal_inum = 0;
1535 unsigned long journal_devnum = 0;
1536 unsigned long def_mount_opts;
1537 struct inode *root;
1538 int blocksize;
1539 int hblock;
1540 int db_count;
1541 int i;
1542 int needs_recovery;
1543 int ret = -EINVAL;
1544 __le32 features;
1545 int err;
1546
1547 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1548 if (!sbi)
1549 return -ENOMEM;
1550
1551 sbi->s_blockgroup_lock =
1552 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1553 if (!sbi->s_blockgroup_lock) {
1554 kfree(sbi);
1555 return -ENOMEM;
1556 }
1557 sb->s_fs_info = sbi;
1558 sbi->s_mount_opt = 0;
1559 sbi->s_resuid = EXT3_DEF_RESUID;
1560 sbi->s_resgid = EXT3_DEF_RESGID;
1561 sbi->s_sb_block = sb_block;
1562
1563 unlock_kernel();
1564
1565 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1566 if (!blocksize) {
1567 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1568 goto out_fail;
1569 }
1570
1571 /*
1572 * The ext3 superblock will not be buffer aligned for other than 1kB
1573 * block sizes. We need to calculate the offset from buffer start.
1574 */
1575 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1576 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1577 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1578 } else {
1579 logic_sb_block = sb_block;
1580 }
1581
1582 if (!(bh = sb_bread(sb, logic_sb_block))) {
1583 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1584 goto out_fail;
1585 }
1586 /*
1587 * Note: s_es must be initialized as soon as possible because
1588 * some ext3 macro-instructions depend on its value
1589 */
1590 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1591 sbi->s_es = es;
1592 sb->s_magic = le16_to_cpu(es->s_magic);
1593 if (sb->s_magic != EXT3_SUPER_MAGIC)
1594 goto cantfind_ext3;
1595
1596 /* Set defaults before we parse the mount options */
1597 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1598 if (def_mount_opts & EXT3_DEFM_DEBUG)
1599 set_opt(sbi->s_mount_opt, DEBUG);
1600 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1601 set_opt(sbi->s_mount_opt, GRPID);
1602 if (def_mount_opts & EXT3_DEFM_UID16)
1603 set_opt(sbi->s_mount_opt, NO_UID32);
1604 #ifdef CONFIG_EXT3_FS_XATTR
1605 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1606 set_opt(sbi->s_mount_opt, XATTR_USER);
1607 #endif
1608 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1609 if (def_mount_opts & EXT3_DEFM_ACL)
1610 set_opt(sbi->s_mount_opt, POSIX_ACL);
1611 #endif
1612 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1613 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1614 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1615 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1616 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1617 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1618
1619 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1620 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1621 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1622 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1623 else
1624 set_opt(sbi->s_mount_opt, ERRORS_RO);
1625
1626 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1627 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1628
1629 set_opt(sbi->s_mount_opt, RESERVATION);
1630
1631 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1632 NULL, 0))
1633 goto failed_mount;
1634
1635 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1636 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1637
1638 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1639 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1640 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1641 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1642 printk(KERN_WARNING
1643 "EXT3-fs warning: feature flags set on rev 0 fs, "
1644 "running e2fsck is recommended\n");
1645 /*
1646 * Check feature flags regardless of the revision level, since we
1647 * previously didn't change the revision level when setting the flags,
1648 * so there is a chance incompat flags are set on a rev 0 filesystem.
1649 */
1650 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1651 if (features) {
1652 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1653 "unsupported optional features (%x).\n",
1654 sb->s_id, le32_to_cpu(features));
1655 goto failed_mount;
1656 }
1657 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1658 if (!(sb->s_flags & MS_RDONLY) && features) {
1659 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1660 "unsupported optional features (%x).\n",
1661 sb->s_id, le32_to_cpu(features));
1662 goto failed_mount;
1663 }
1664 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1665
1666 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1667 blocksize > EXT3_MAX_BLOCK_SIZE) {
1668 printk(KERN_ERR
1669 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1670 blocksize, sb->s_id);
1671 goto failed_mount;
1672 }
1673
1674 hblock = bdev_hardsect_size(sb->s_bdev);
1675 if (sb->s_blocksize != blocksize) {
1676 /*
1677 * Make sure the blocksize for the filesystem is larger
1678 * than the hardware sectorsize for the machine.
1679 */
1680 if (blocksize < hblock) {
1681 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1682 "device blocksize %d.\n", blocksize, hblock);
1683 goto failed_mount;
1684 }
1685
1686 brelse (bh);
1687 if (!sb_set_blocksize(sb, blocksize)) {
1688 printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1689 blocksize);
1690 goto out_fail;
1691 }
1692 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1693 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1694 bh = sb_bread(sb, logic_sb_block);
1695 if (!bh) {
1696 printk(KERN_ERR
1697 "EXT3-fs: Can't read superblock on 2nd try.\n");
1698 goto failed_mount;
1699 }
1700 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1701 sbi->s_es = es;
1702 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1703 printk (KERN_ERR
1704 "EXT3-fs: Magic mismatch, very weird !\n");
1705 goto failed_mount;
1706 }
1707 }
1708
1709 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1710
1711 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1712 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1713 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1714 } else {
1715 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1716 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1717 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1718 (!is_power_of_2(sbi->s_inode_size)) ||
1719 (sbi->s_inode_size > blocksize)) {
1720 printk (KERN_ERR
1721 "EXT3-fs: unsupported inode size: %d\n",
1722 sbi->s_inode_size);
1723 goto failed_mount;
1724 }
1725 }
1726 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1727 le32_to_cpu(es->s_log_frag_size);
1728 if (blocksize != sbi->s_frag_size) {
1729 printk(KERN_ERR
1730 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1731 sbi->s_frag_size, blocksize);
1732 goto failed_mount;
1733 }
1734 sbi->s_frags_per_block = 1;
1735 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1736 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1737 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1738 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1739 goto cantfind_ext3;
1740 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1741 if (sbi->s_inodes_per_block == 0)
1742 goto cantfind_ext3;
1743 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1744 sbi->s_inodes_per_block;
1745 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1746 sbi->s_sbh = bh;
1747 sbi->s_mount_state = le16_to_cpu(es->s_state);
1748 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1749 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1750 for (i=0; i < 4; i++)
1751 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1752 sbi->s_def_hash_version = es->s_def_hash_version;
1753
1754 if (sbi->s_blocks_per_group > blocksize * 8) {
1755 printk (KERN_ERR
1756 "EXT3-fs: #blocks per group too big: %lu\n",
1757 sbi->s_blocks_per_group);
1758 goto failed_mount;
1759 }
1760 if (sbi->s_frags_per_group > blocksize * 8) {
1761 printk (KERN_ERR
1762 "EXT3-fs: #fragments per group too big: %lu\n",
1763 sbi->s_frags_per_group);
1764 goto failed_mount;
1765 }
1766 if (sbi->s_inodes_per_group > blocksize * 8) {
1767 printk (KERN_ERR
1768 "EXT3-fs: #inodes per group too big: %lu\n",
1769 sbi->s_inodes_per_group);
1770 goto failed_mount;
1771 }
1772
1773 if (le32_to_cpu(es->s_blocks_count) >
1774 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1775 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1776 " too large to mount safely\n", sb->s_id);
1777 if (sizeof(sector_t) < 8)
1778 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1779 "enabled\n");
1780 goto failed_mount;
1781 }
1782
1783 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1784 goto cantfind_ext3;
1785 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1786 le32_to_cpu(es->s_first_data_block) - 1)
1787 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1788 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1789 EXT3_DESC_PER_BLOCK(sb);
1790 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1791 GFP_KERNEL);
1792 if (sbi->s_group_desc == NULL) {
1793 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1794 goto failed_mount;
1795 }
1796
1797 bgl_lock_init(sbi->s_blockgroup_lock);
1798
1799 for (i = 0; i < db_count; i++) {
1800 block = descriptor_loc(sb, logic_sb_block, i);
1801 sbi->s_group_desc[i] = sb_bread(sb, block);
1802 if (!sbi->s_group_desc[i]) {
1803 printk (KERN_ERR "EXT3-fs: "
1804 "can't read group descriptor %d\n", i);
1805 db_count = i;
1806 goto failed_mount2;
1807 }
1808 }
1809 if (!ext3_check_descriptors (sb)) {
1810 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1811 goto failed_mount2;
1812 }
1813 sbi->s_gdb_count = db_count;
1814 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1815 spin_lock_init(&sbi->s_next_gen_lock);
1816
1817 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1818 ext3_count_free_blocks(sb));
1819 if (!err) {
1820 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1821 ext3_count_free_inodes(sb));
1822 }
1823 if (!err) {
1824 err = percpu_counter_init(&sbi->s_dirs_counter,
1825 ext3_count_dirs(sb));
1826 }
1827 if (err) {
1828 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1829 goto failed_mount3;
1830 }
1831
1832 /* per fileystem reservation list head & lock */
1833 spin_lock_init(&sbi->s_rsv_window_lock);
1834 sbi->s_rsv_window_root = RB_ROOT;
1835 /* Add a single, static dummy reservation to the start of the
1836 * reservation window list --- it gives us a placeholder for
1837 * append-at-start-of-list which makes the allocation logic
1838 * _much_ simpler. */
1839 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1840 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1841 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1842 sbi->s_rsv_window_head.rsv_goal_size = 0;
1843 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1844
1845 /*
1846 * set up enough so that it can read an inode
1847 */
1848 sb->s_op = &ext3_sops;
1849 sb->s_export_op = &ext3_export_ops;
1850 sb->s_xattr = ext3_xattr_handlers;
1851 #ifdef CONFIG_QUOTA
1852 sb->s_qcop = &ext3_qctl_operations;
1853 sb->dq_op = &ext3_quota_operations;
1854 #endif
1855 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1856
1857 sb->s_root = NULL;
1858
1859 needs_recovery = (es->s_last_orphan != 0 ||
1860 EXT3_HAS_INCOMPAT_FEATURE(sb,
1861 EXT3_FEATURE_INCOMPAT_RECOVER));
1862
1863 /*
1864 * The first inode we look at is the journal inode. Don't try
1865 * root first: it may be modified in the journal!
1866 */
1867 if (!test_opt(sb, NOLOAD) &&
1868 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1869 if (ext3_load_journal(sb, es, journal_devnum))
1870 goto failed_mount3;
1871 } else if (journal_inum) {
1872 if (ext3_create_journal(sb, es, journal_inum))
1873 goto failed_mount3;
1874 } else {
1875 if (!silent)
1876 printk (KERN_ERR
1877 "ext3: No journal on filesystem on %s\n",
1878 sb->s_id);
1879 goto failed_mount3;
1880 }
1881
1882 /* We have now updated the journal if required, so we can
1883 * validate the data journaling mode. */
1884 switch (test_opt(sb, DATA_FLAGS)) {
1885 case 0:
1886 /* No mode set, assume a default based on the journal
1887 capabilities: ORDERED_DATA if the journal can
1888 cope, else JOURNAL_DATA */
1889 if (journal_check_available_features
1890 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1891 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1892 else
1893 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1894 break;
1895
1896 case EXT3_MOUNT_ORDERED_DATA:
1897 case EXT3_MOUNT_WRITEBACK_DATA:
1898 if (!journal_check_available_features
1899 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1900 printk(KERN_ERR "EXT3-fs: Journal does not support "
1901 "requested data journaling mode\n");
1902 goto failed_mount4;
1903 }
1904 default:
1905 break;
1906 }
1907
1908 if (test_opt(sb, NOBH)) {
1909 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1910 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1911 "its supported only with writeback mode\n");
1912 clear_opt(sbi->s_mount_opt, NOBH);
1913 }
1914 }
1915 /*
1916 * The journal_load will have done any necessary log recovery,
1917 * so we can safely mount the rest of the filesystem now.
1918 */
1919
1920 root = ext3_iget(sb, EXT3_ROOT_INO);
1921 if (IS_ERR(root)) {
1922 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1923 ret = PTR_ERR(root);
1924 goto failed_mount4;
1925 }
1926 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1927 iput(root);
1928 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1929 goto failed_mount4;
1930 }
1931 sb->s_root = d_alloc_root(root);
1932 if (!sb->s_root) {
1933 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1934 iput(root);
1935 ret = -ENOMEM;
1936 goto failed_mount4;
1937 }
1938
1939 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1940 /*
1941 * akpm: core read_super() calls in here with the superblock locked.
1942 * That deadlocks, because orphan cleanup needs to lock the superblock
1943 * in numerous places. Here we just pop the lock - it's relatively
1944 * harmless, because we are now ready to accept write_super() requests,
1945 * and aviro says that's the only reason for hanging onto the
1946 * superblock lock.
1947 */
1948 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1949 ext3_orphan_cleanup(sb, es);
1950 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1951 if (needs_recovery)
1952 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1953 ext3_mark_recovery_complete(sb, es);
1954 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1955 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1956 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1957 "writeback");
1958
1959 lock_kernel();
1960 return 0;
1961
1962 cantfind_ext3:
1963 if (!silent)
1964 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1965 sb->s_id);
1966 goto failed_mount;
1967
1968 failed_mount4:
1969 journal_destroy(sbi->s_journal);
1970 failed_mount3:
1971 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1972 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1973 percpu_counter_destroy(&sbi->s_dirs_counter);
1974 failed_mount2:
1975 for (i = 0; i < db_count; i++)
1976 brelse(sbi->s_group_desc[i]);
1977 kfree(sbi->s_group_desc);
1978 failed_mount:
1979 #ifdef CONFIG_QUOTA
1980 for (i = 0; i < MAXQUOTAS; i++)
1981 kfree(sbi->s_qf_names[i]);
1982 #endif
1983 ext3_blkdev_remove(sbi);
1984 brelse(bh);
1985 out_fail:
1986 sb->s_fs_info = NULL;
1987 kfree(sbi);
1988 lock_kernel();
1989 return ret;
1990 }
1991
1992 /*
1993 * Setup any per-fs journal parameters now. We'll do this both on
1994 * initial mount, once the journal has been initialised but before we've
1995 * done any recovery; and again on any subsequent remount.
1996 */
1997 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1998 {
1999 struct ext3_sb_info *sbi = EXT3_SB(sb);
2000
2001 if (sbi->s_commit_interval)
2002 journal->j_commit_interval = sbi->s_commit_interval;
2003 /* We could also set up an ext3-specific default for the commit
2004 * interval here, but for now we'll just fall back to the jbd
2005 * default. */
2006
2007 spin_lock(&journal->j_state_lock);
2008 if (test_opt(sb, BARRIER))
2009 journal->j_flags |= JFS_BARRIER;
2010 else
2011 journal->j_flags &= ~JFS_BARRIER;
2012 if (test_opt(sb, DATA_ERR_ABORT))
2013 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2014 else
2015 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2016 spin_unlock(&journal->j_state_lock);
2017 }
2018
2019 static journal_t *ext3_get_journal(struct super_block *sb,
2020 unsigned int journal_inum)
2021 {
2022 struct inode *journal_inode;
2023 journal_t *journal;
2024
2025 /* First, test for the existence of a valid inode on disk. Bad
2026 * things happen if we iget() an unused inode, as the subsequent
2027 * iput() will try to delete it. */
2028
2029 journal_inode = ext3_iget(sb, journal_inum);
2030 if (IS_ERR(journal_inode)) {
2031 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2032 return NULL;
2033 }
2034 if (!journal_inode->i_nlink) {
2035 make_bad_inode(journal_inode);
2036 iput(journal_inode);
2037 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2038 return NULL;
2039 }
2040
2041 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2042 journal_inode, journal_inode->i_size);
2043 if (!S_ISREG(journal_inode->i_mode)) {
2044 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2045 iput(journal_inode);
2046 return NULL;
2047 }
2048
2049 journal = journal_init_inode(journal_inode);
2050 if (!journal) {
2051 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2052 iput(journal_inode);
2053 return NULL;
2054 }
2055 journal->j_private = sb;
2056 ext3_init_journal_params(sb, journal);
2057 return journal;
2058 }
2059
2060 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2061 dev_t j_dev)
2062 {
2063 struct buffer_head * bh;
2064 journal_t *journal;
2065 ext3_fsblk_t start;
2066 ext3_fsblk_t len;
2067 int hblock, blocksize;
2068 ext3_fsblk_t sb_block;
2069 unsigned long offset;
2070 struct ext3_super_block * es;
2071 struct block_device *bdev;
2072
2073 bdev = ext3_blkdev_get(j_dev);
2074 if (bdev == NULL)
2075 return NULL;
2076
2077 if (bd_claim(bdev, sb)) {
2078 printk(KERN_ERR
2079 "EXT3: failed to claim external journal device.\n");
2080 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2081 return NULL;
2082 }
2083
2084 blocksize = sb->s_blocksize;
2085 hblock = bdev_hardsect_size(bdev);
2086 if (blocksize < hblock) {
2087 printk(KERN_ERR
2088 "EXT3-fs: blocksize too small for journal device.\n");
2089 goto out_bdev;
2090 }
2091
2092 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2093 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2094 set_blocksize(bdev, blocksize);
2095 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2096 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2097 "external journal\n");
2098 goto out_bdev;
2099 }
2100
2101 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2102 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2103 !(le32_to_cpu(es->s_feature_incompat) &
2104 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2105 printk(KERN_ERR "EXT3-fs: external journal has "
2106 "bad superblock\n");
2107 brelse(bh);
2108 goto out_bdev;
2109 }
2110
2111 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2112 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2113 brelse(bh);
2114 goto out_bdev;
2115 }
2116
2117 len = le32_to_cpu(es->s_blocks_count);
2118 start = sb_block + 1;
2119 brelse(bh); /* we're done with the superblock */
2120
2121 journal = journal_init_dev(bdev, sb->s_bdev,
2122 start, len, blocksize);
2123 if (!journal) {
2124 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2125 goto out_bdev;
2126 }
2127 journal->j_private = sb;
2128 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2129 wait_on_buffer(journal->j_sb_buffer);
2130 if (!buffer_uptodate(journal->j_sb_buffer)) {
2131 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2132 goto out_journal;
2133 }
2134 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2135 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2136 "user (unsupported) - %d\n",
2137 be32_to_cpu(journal->j_superblock->s_nr_users));
2138 goto out_journal;
2139 }
2140 EXT3_SB(sb)->journal_bdev = bdev;
2141 ext3_init_journal_params(sb, journal);
2142 return journal;
2143 out_journal:
2144 journal_destroy(journal);
2145 out_bdev:
2146 ext3_blkdev_put(bdev);
2147 return NULL;
2148 }
2149
2150 static int ext3_load_journal(struct super_block *sb,
2151 struct ext3_super_block *es,
2152 unsigned long journal_devnum)
2153 {
2154 journal_t *journal;
2155 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2156 dev_t journal_dev;
2157 int err = 0;
2158 int really_read_only;
2159
2160 if (journal_devnum &&
2161 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2162 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2163 "numbers have changed\n");
2164 journal_dev = new_decode_dev(journal_devnum);
2165 } else
2166 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2167
2168 really_read_only = bdev_read_only(sb->s_bdev);
2169
2170 /*
2171 * Are we loading a blank journal or performing recovery after a
2172 * crash? For recovery, we need to check in advance whether we
2173 * can get read-write access to the device.
2174 */
2175
2176 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2177 if (sb->s_flags & MS_RDONLY) {
2178 printk(KERN_INFO "EXT3-fs: INFO: recovery "
2179 "required on readonly filesystem.\n");
2180 if (really_read_only) {
2181 printk(KERN_ERR "EXT3-fs: write access "
2182 "unavailable, cannot proceed.\n");
2183 return -EROFS;
2184 }
2185 printk (KERN_INFO "EXT3-fs: write access will "
2186 "be enabled during recovery.\n");
2187 }
2188 }
2189
2190 if (journal_inum && journal_dev) {
2191 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2192 "and inode journals!\n");
2193 return -EINVAL;
2194 }
2195
2196 if (journal_inum) {
2197 if (!(journal = ext3_get_journal(sb, journal_inum)))
2198 return -EINVAL;
2199 } else {
2200 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2201 return -EINVAL;
2202 }
2203
2204 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2205 err = journal_update_format(journal);
2206 if (err) {
2207 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2208 journal_destroy(journal);
2209 return err;
2210 }
2211 }
2212
2213 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2214 err = journal_wipe(journal, !really_read_only);
2215 if (!err)
2216 err = journal_load(journal);
2217
2218 if (err) {
2219 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2220 journal_destroy(journal);
2221 return err;
2222 }
2223
2224 EXT3_SB(sb)->s_journal = journal;
2225 ext3_clear_journal_err(sb, es);
2226
2227 if (journal_devnum &&
2228 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2229 es->s_journal_dev = cpu_to_le32(journal_devnum);
2230 sb->s_dirt = 1;
2231
2232 /* Make sure we flush the recovery flag to disk. */
2233 ext3_commit_super(sb, es, 1);
2234 }
2235
2236 return 0;
2237 }
2238
2239 static int ext3_create_journal(struct super_block * sb,
2240 struct ext3_super_block * es,
2241 unsigned int journal_inum)
2242 {
2243 journal_t *journal;
2244 int err;
2245
2246 if (sb->s_flags & MS_RDONLY) {
2247 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2248 "create journal.\n");
2249 return -EROFS;
2250 }
2251
2252 journal = ext3_get_journal(sb, journal_inum);
2253 if (!journal)
2254 return -EINVAL;
2255
2256 printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2257 journal_inum);
2258
2259 err = journal_create(journal);
2260 if (err) {
2261 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2262 journal_destroy(journal);
2263 return -EIO;
2264 }
2265
2266 EXT3_SB(sb)->s_journal = journal;
2267
2268 ext3_update_dynamic_rev(sb);
2269 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2270 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2271
2272 es->s_journal_inum = cpu_to_le32(journal_inum);
2273 sb->s_dirt = 1;
2274
2275 /* Make sure we flush the recovery flag to disk. */
2276 ext3_commit_super(sb, es, 1);
2277
2278 return 0;
2279 }
2280
2281 static void ext3_commit_super (struct super_block * sb,
2282 struct ext3_super_block * es,
2283 int sync)
2284 {
2285 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2286
2287 if (!sbh)
2288 return;
2289 es->s_wtime = cpu_to_le32(get_seconds());
2290 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2291 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2292 BUFFER_TRACE(sbh, "marking dirty");
2293 mark_buffer_dirty(sbh);
2294 if (sync)
2295 sync_dirty_buffer(sbh);
2296 }
2297
2298
2299 /*
2300 * Have we just finished recovery? If so, and if we are mounting (or
2301 * remounting) the filesystem readonly, then we will end up with a
2302 * consistent fs on disk. Record that fact.
2303 */
2304 static void ext3_mark_recovery_complete(struct super_block * sb,
2305 struct ext3_super_block * es)
2306 {
2307 journal_t *journal = EXT3_SB(sb)->s_journal;
2308
2309 journal_lock_updates(journal);
2310 if (journal_flush(journal) < 0)
2311 goto out;
2312
2313 lock_super(sb);
2314 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2315 sb->s_flags & MS_RDONLY) {
2316 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2317 sb->s_dirt = 0;
2318 ext3_commit_super(sb, es, 1);
2319 }
2320 unlock_super(sb);
2321
2322 out:
2323 journal_unlock_updates(journal);
2324 }
2325
2326 /*
2327 * If we are mounting (or read-write remounting) a filesystem whose journal
2328 * has recorded an error from a previous lifetime, move that error to the
2329 * main filesystem now.
2330 */
2331 static void ext3_clear_journal_err(struct super_block * sb,
2332 struct ext3_super_block * es)
2333 {
2334 journal_t *journal;
2335 int j_errno;
2336 const char *errstr;
2337
2338 journal = EXT3_SB(sb)->s_journal;
2339
2340 /*
2341 * Now check for any error status which may have been recorded in the
2342 * journal by a prior ext3_error() or ext3_abort()
2343 */
2344
2345 j_errno = journal_errno(journal);
2346 if (j_errno) {
2347 char nbuf[16];
2348
2349 errstr = ext3_decode_error(sb, j_errno, nbuf);
2350 ext3_warning(sb, __func__, "Filesystem error recorded "
2351 "from previous mount: %s", errstr);
2352 ext3_warning(sb, __func__, "Marking fs in need of "
2353 "filesystem check.");
2354
2355 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2356 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2357 ext3_commit_super (sb, es, 1);
2358
2359 journal_clear_err(journal);
2360 }
2361 }
2362
2363 /*
2364 * Force the running and committing transactions to commit,
2365 * and wait on the commit.
2366 */
2367 int ext3_force_commit(struct super_block *sb)
2368 {
2369 journal_t *journal;
2370 int ret;
2371
2372 if (sb->s_flags & MS_RDONLY)
2373 return 0;
2374
2375 journal = EXT3_SB(sb)->s_journal;
2376 sb->s_dirt = 0;
2377 ret = ext3_journal_force_commit(journal);
2378 return ret;
2379 }
2380
2381 /*
2382 * Ext3 always journals updates to the superblock itself, so we don't
2383 * have to propagate any other updates to the superblock on disk at this
2384 * point. (We can probably nuke this function altogether, and remove
2385 * any mention to sb->s_dirt in all of fs/ext3; eventual cleanup...)
2386 */
2387 static void ext3_write_super (struct super_block * sb)
2388 {
2389 if (mutex_trylock(&sb->s_lock) != 0)
2390 BUG();
2391 sb->s_dirt = 0;
2392 }
2393
2394 static int ext3_sync_fs(struct super_block *sb, int wait)
2395 {
2396 sb->s_dirt = 0;
2397 if (wait)
2398 ext3_force_commit(sb);
2399 else
2400 journal_start_commit(EXT3_SB(sb)->s_journal, NULL);
2401
2402 return 0;
2403 }
2404
2405 /*
2406 * LVM calls this function before a (read-only) snapshot is created. This
2407 * gives us a chance to flush the journal completely and mark the fs clean.
2408 */
2409 static void ext3_write_super_lockfs(struct super_block *sb)
2410 {
2411 sb->s_dirt = 0;
2412
2413 if (!(sb->s_flags & MS_RDONLY)) {
2414 journal_t *journal = EXT3_SB(sb)->s_journal;
2415
2416 /* Now we set up the journal barrier. */
2417 journal_lock_updates(journal);
2418
2419 /*
2420 * We don't want to clear needs_recovery flag when we failed
2421 * to flush the journal.
2422 */
2423 if (journal_flush(journal) < 0)
2424 return;
2425
2426 /* Journal blocked and flushed, clear needs_recovery flag. */
2427 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2428 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2429 }
2430 }
2431
2432 /*
2433 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2434 * flag here, even though the filesystem is not technically dirty yet.
2435 */
2436 static void ext3_unlockfs(struct super_block *sb)
2437 {
2438 if (!(sb->s_flags & MS_RDONLY)) {
2439 lock_super(sb);
2440 /* Reser the needs_recovery flag before the fs is unlocked. */
2441 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2442 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2443 unlock_super(sb);
2444 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2445 }
2446 }
2447
2448 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2449 {
2450 struct ext3_super_block * es;
2451 struct ext3_sb_info *sbi = EXT3_SB(sb);
2452 ext3_fsblk_t n_blocks_count = 0;
2453 unsigned long old_sb_flags;
2454 struct ext3_mount_options old_opts;
2455 int err;
2456 #ifdef CONFIG_QUOTA
2457 int i;
2458 #endif
2459
2460 /* Store the original options */
2461 old_sb_flags = sb->s_flags;
2462 old_opts.s_mount_opt = sbi->s_mount_opt;
2463 old_opts.s_resuid = sbi->s_resuid;
2464 old_opts.s_resgid = sbi->s_resgid;
2465 old_opts.s_commit_interval = sbi->s_commit_interval;
2466 #ifdef CONFIG_QUOTA
2467 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2468 for (i = 0; i < MAXQUOTAS; i++)
2469 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2470 #endif
2471
2472 /*
2473 * Allow the "check" option to be passed as a remount option.
2474 */
2475 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2476 err = -EINVAL;
2477 goto restore_opts;
2478 }
2479
2480 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2481 ext3_abort(sb, __func__, "Abort forced by user");
2482
2483 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2484 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2485
2486 es = sbi->s_es;
2487
2488 ext3_init_journal_params(sb, sbi->s_journal);
2489
2490 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2491 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2492 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2493 err = -EROFS;
2494 goto restore_opts;
2495 }
2496
2497 if (*flags & MS_RDONLY) {
2498 /*
2499 * First of all, the unconditional stuff we have to do
2500 * to disable replay of the journal when we next remount
2501 */
2502 sb->s_flags |= MS_RDONLY;
2503
2504 /*
2505 * OK, test if we are remounting a valid rw partition
2506 * readonly, and if so set the rdonly flag and then
2507 * mark the partition as valid again.
2508 */
2509 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2510 (sbi->s_mount_state & EXT3_VALID_FS))
2511 es->s_state = cpu_to_le16(sbi->s_mount_state);
2512
2513 /*
2514 * We have to unlock super so that we can wait for
2515 * transactions.
2516 */
2517 unlock_super(sb);
2518 ext3_mark_recovery_complete(sb, es);
2519 lock_super(sb);
2520 } else {
2521 __le32 ret;
2522 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2523 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2524 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2525 "remount RDWR because of unsupported "
2526 "optional features (%x).\n",
2527 sb->s_id, le32_to_cpu(ret));
2528 err = -EROFS;
2529 goto restore_opts;
2530 }
2531
2532 /*
2533 * If we have an unprocessed orphan list hanging
2534 * around from a previously readonly bdev mount,
2535 * require a full umount/remount for now.
2536 */
2537 if (es->s_last_orphan) {
2538 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2539 "remount RDWR because of unprocessed "
2540 "orphan inode list. Please "
2541 "umount/remount instead.\n",
2542 sb->s_id);
2543 err = -EINVAL;
2544 goto restore_opts;
2545 }
2546
2547 /*
2548 * Mounting a RDONLY partition read-write, so reread
2549 * and store the current valid flag. (It may have
2550 * been changed by e2fsck since we originally mounted
2551 * the partition.)
2552 */
2553 ext3_clear_journal_err(sb, es);
2554 sbi->s_mount_state = le16_to_cpu(es->s_state);
2555 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2556 goto restore_opts;
2557 if (!ext3_setup_super (sb, es, 0))
2558 sb->s_flags &= ~MS_RDONLY;
2559 }
2560 }
2561 #ifdef CONFIG_QUOTA
2562 /* Release old quota file names */
2563 for (i = 0; i < MAXQUOTAS; i++)
2564 if (old_opts.s_qf_names[i] &&
2565 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2566 kfree(old_opts.s_qf_names[i]);
2567 #endif
2568 return 0;
2569 restore_opts:
2570 sb->s_flags = old_sb_flags;
2571 sbi->s_mount_opt = old_opts.s_mount_opt;
2572 sbi->s_resuid = old_opts.s_resuid;
2573 sbi->s_resgid = old_opts.s_resgid;
2574 sbi->s_commit_interval = old_opts.s_commit_interval;
2575 #ifdef CONFIG_QUOTA
2576 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2577 for (i = 0; i < MAXQUOTAS; i++) {
2578 if (sbi->s_qf_names[i] &&
2579 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2580 kfree(sbi->s_qf_names[i]);
2581 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2582 }
2583 #endif
2584 return err;
2585 }
2586
2587 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2588 {
2589 struct super_block *sb = dentry->d_sb;
2590 struct ext3_sb_info *sbi = EXT3_SB(sb);
2591 struct ext3_super_block *es = sbi->s_es;
2592 u64 fsid;
2593
2594 if (test_opt(sb, MINIX_DF)) {
2595 sbi->s_overhead_last = 0;
2596 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2597 unsigned long ngroups = sbi->s_groups_count, i;
2598 ext3_fsblk_t overhead = 0;
2599 smp_rmb();
2600
2601 /*
2602 * Compute the overhead (FS structures). This is constant
2603 * for a given filesystem unless the number of block groups
2604 * changes so we cache the previous value until it does.
2605 */
2606
2607 /*
2608 * All of the blocks before first_data_block are
2609 * overhead
2610 */
2611 overhead = le32_to_cpu(es->s_first_data_block);
2612
2613 /*
2614 * Add the overhead attributed to the superblock and
2615 * block group descriptors. If the sparse superblocks
2616 * feature is turned on, then not all groups have this.
2617 */
2618 for (i = 0; i < ngroups; i++) {
2619 overhead += ext3_bg_has_super(sb, i) +
2620 ext3_bg_num_gdb(sb, i);
2621 cond_resched();
2622 }
2623
2624 /*
2625 * Every block group has an inode bitmap, a block
2626 * bitmap, and an inode table.
2627 */
2628 overhead += ngroups * (2 + sbi->s_itb_per_group);
2629 sbi->s_overhead_last = overhead;
2630 smp_wmb();
2631 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2632 }
2633
2634 buf->f_type = EXT3_SUPER_MAGIC;
2635 buf->f_bsize = sb->s_blocksize;
2636 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2637 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2638 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2639 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2640 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2641 buf->f_bavail = 0;
2642 buf->f_files = le32_to_cpu(es->s_inodes_count);
2643 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2644 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2645 buf->f_namelen = EXT3_NAME_LEN;
2646 fsid = le64_to_cpup((void *)es->s_uuid) ^
2647 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2648 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2649 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2650 return 0;
2651 }
2652
2653 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2654 * is locked for write. Otherwise the are possible deadlocks:
2655 * Process 1 Process 2
2656 * ext3_create() quota_sync()
2657 * journal_start() write_dquot()
2658 * DQUOT_INIT() down(dqio_mutex)
2659 * down(dqio_mutex) journal_start()
2660 *
2661 */
2662
2663 #ifdef CONFIG_QUOTA
2664
2665 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2666 {
2667 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2668 }
2669
2670 static int ext3_dquot_initialize(struct inode *inode, int type)
2671 {
2672 handle_t *handle;
2673 int ret, err;
2674
2675 /* We may create quota structure so we need to reserve enough blocks */
2676 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2677 if (IS_ERR(handle))
2678 return PTR_ERR(handle);
2679 ret = dquot_initialize(inode, type);
2680 err = ext3_journal_stop(handle);
2681 if (!ret)
2682 ret = err;
2683 return ret;
2684 }
2685
2686 static int ext3_dquot_drop(struct inode *inode)
2687 {
2688 handle_t *handle;
2689 int ret, err;
2690
2691 /* We may delete quota structure so we need to reserve enough blocks */
2692 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2693 if (IS_ERR(handle)) {
2694 /*
2695 * We call dquot_drop() anyway to at least release references
2696 * to quota structures so that umount does not hang.
2697 */
2698 dquot_drop(inode);
2699 return PTR_ERR(handle);
2700 }
2701 ret = dquot_drop(inode);
2702 err = ext3_journal_stop(handle);
2703 if (!ret)
2704 ret = err;
2705 return ret;
2706 }
2707
2708 static int ext3_write_dquot(struct dquot *dquot)
2709 {
2710 int ret, err;
2711 handle_t *handle;
2712 struct inode *inode;
2713
2714 inode = dquot_to_inode(dquot);
2715 handle = ext3_journal_start(inode,
2716 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2717 if (IS_ERR(handle))
2718 return PTR_ERR(handle);
2719 ret = dquot_commit(dquot);
2720 err = ext3_journal_stop(handle);
2721 if (!ret)
2722 ret = err;
2723 return ret;
2724 }
2725
2726 static int ext3_acquire_dquot(struct dquot *dquot)
2727 {
2728 int ret, err;
2729 handle_t *handle;
2730
2731 handle = ext3_journal_start(dquot_to_inode(dquot),
2732 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2733 if (IS_ERR(handle))
2734 return PTR_ERR(handle);
2735 ret = dquot_acquire(dquot);
2736 err = ext3_journal_stop(handle);
2737 if (!ret)
2738 ret = err;
2739 return ret;
2740 }
2741
2742 static int ext3_release_dquot(struct dquot *dquot)
2743 {
2744 int ret, err;
2745 handle_t *handle;
2746
2747 handle = ext3_journal_start(dquot_to_inode(dquot),
2748 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2749 if (IS_ERR(handle)) {
2750 /* Release dquot anyway to avoid endless cycle in dqput() */
2751 dquot_release(dquot);
2752 return PTR_ERR(handle);
2753 }
2754 ret = dquot_release(dquot);
2755 err = ext3_journal_stop(handle);
2756 if (!ret)
2757 ret = err;
2758 return ret;
2759 }
2760
2761 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2762 {
2763 /* Are we journaling quotas? */
2764 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2765 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2766 dquot_mark_dquot_dirty(dquot);
2767 return ext3_write_dquot(dquot);
2768 } else {
2769 return dquot_mark_dquot_dirty(dquot);
2770 }
2771 }
2772
2773 static int ext3_write_info(struct super_block *sb, int type)
2774 {
2775 int ret, err;
2776 handle_t *handle;
2777
2778 /* Data block + inode block */
2779 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2780 if (IS_ERR(handle))
2781 return PTR_ERR(handle);
2782 ret = dquot_commit_info(sb, type);
2783 err = ext3_journal_stop(handle);
2784 if (!ret)
2785 ret = err;
2786 return ret;
2787 }
2788
2789 /*
2790 * Turn on quotas during mount time - we need to find
2791 * the quota file and such...
2792 */
2793 static int ext3_quota_on_mount(struct super_block *sb, int type)
2794 {
2795 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2796 EXT3_SB(sb)->s_jquota_fmt, type);
2797 }
2798
2799 /*
2800 * Standard function to be called on quota_on
2801 */
2802 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2803 char *name, int remount)
2804 {
2805 int err;
2806 struct path path;
2807
2808 if (!test_opt(sb, QUOTA))
2809 return -EINVAL;
2810 /* When remounting, no checks are needed and in fact, name is NULL */
2811 if (remount)
2812 return vfs_quota_on(sb, type, format_id, name, remount);
2813
2814 err = kern_path(name, LOOKUP_FOLLOW, &path);
2815 if (err)
2816 return err;
2817
2818 /* Quotafile not on the same filesystem? */
2819 if (path.mnt->mnt_sb != sb) {
2820 path_put(&path);
2821 return -EXDEV;
2822 }
2823 /* Journaling quota? */
2824 if (EXT3_SB(sb)->s_qf_names[type]) {
2825 /* Quotafile not of fs root? */
2826 if (path.dentry->d_parent != sb->s_root)
2827 printk(KERN_WARNING
2828 "EXT3-fs: Quota file not on filesystem root. "
2829 "Journaled quota will not work.\n");
2830 }
2831
2832 /*
2833 * When we journal data on quota file, we have to flush journal to see
2834 * all updates to the file when we bypass pagecache...
2835 */
2836 if (ext3_should_journal_data(path.dentry->d_inode)) {
2837 /*
2838 * We don't need to lock updates but journal_flush() could
2839 * otherwise be livelocked...
2840 */
2841 journal_lock_updates(EXT3_SB(sb)->s_journal);
2842 err = journal_flush(EXT3_SB(sb)->s_journal);
2843 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2844 if (err) {
2845 path_put(&path);
2846 return err;
2847 }
2848 }
2849
2850 err = vfs_quota_on_path(sb, type, format_id, &path);
2851 path_put(&path);
2852 return err;
2853 }
2854
2855 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2856 * acquiring the locks... As quota files are never truncated and quota code
2857 * itself serializes the operations (and noone else should touch the files)
2858 * we don't have to be afraid of races */
2859 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2860 size_t len, loff_t off)
2861 {
2862 struct inode *inode = sb_dqopt(sb)->files[type];
2863 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2864 int err = 0;
2865 int offset = off & (sb->s_blocksize - 1);
2866 int tocopy;
2867 size_t toread;
2868 struct buffer_head *bh;
2869 loff_t i_size = i_size_read(inode);
2870
2871 if (off > i_size)
2872 return 0;
2873 if (off+len > i_size)
2874 len = i_size-off;
2875 toread = len;
2876 while (toread > 0) {
2877 tocopy = sb->s_blocksize - offset < toread ?
2878 sb->s_blocksize - offset : toread;
2879 bh = ext3_bread(NULL, inode, blk, 0, &err);
2880 if (err)
2881 return err;
2882 if (!bh) /* A hole? */
2883 memset(data, 0, tocopy);
2884 else
2885 memcpy(data, bh->b_data+offset, tocopy);
2886 brelse(bh);
2887 offset = 0;
2888 toread -= tocopy;
2889 data += tocopy;
2890 blk++;
2891 }
2892 return len;
2893 }
2894
2895 /* Write to quotafile (we know the transaction is already started and has
2896 * enough credits) */
2897 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2898 const char *data, size_t len, loff_t off)
2899 {
2900 struct inode *inode = sb_dqopt(sb)->files[type];
2901 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2902 int err = 0;
2903 int offset = off & (sb->s_blocksize - 1);
2904 int tocopy;
2905 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2906 size_t towrite = len;
2907 struct buffer_head *bh;
2908 handle_t *handle = journal_current_handle();
2909
2910 if (!handle) {
2911 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2912 " cancelled because transaction is not started.\n",
2913 (unsigned long long)off, (unsigned long long)len);
2914 return -EIO;
2915 }
2916 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2917 while (towrite > 0) {
2918 tocopy = sb->s_blocksize - offset < towrite ?
2919 sb->s_blocksize - offset : towrite;
2920 bh = ext3_bread(handle, inode, blk, 1, &err);
2921 if (!bh)
2922 goto out;
2923 if (journal_quota) {
2924 err = ext3_journal_get_write_access(handle, bh);
2925 if (err) {
2926 brelse(bh);
2927 goto out;
2928 }
2929 }
2930 lock_buffer(bh);
2931 memcpy(bh->b_data+offset, data, tocopy);
2932 flush_dcache_page(bh->b_page);
2933 unlock_buffer(bh);
2934 if (journal_quota)
2935 err = ext3_journal_dirty_metadata(handle, bh);
2936 else {
2937 /* Always do at least ordered writes for quotas */
2938 err = ext3_journal_dirty_data(handle, bh);
2939 mark_buffer_dirty(bh);
2940 }
2941 brelse(bh);
2942 if (err)
2943 goto out;
2944 offset = 0;
2945 towrite -= tocopy;
2946 data += tocopy;
2947 blk++;
2948 }
2949 out:
2950 if (len == towrite) {
2951 mutex_unlock(&inode->i_mutex);
2952 return err;
2953 }
2954 if (inode->i_size < off+len-towrite) {
2955 i_size_write(inode, off+len-towrite);
2956 EXT3_I(inode)->i_disksize = inode->i_size;
2957 }
2958 inode->i_version++;
2959 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2960 ext3_mark_inode_dirty(handle, inode);
2961 mutex_unlock(&inode->i_mutex);
2962 return len - towrite;
2963 }
2964
2965 #endif
2966
2967 static int ext3_get_sb(struct file_system_type *fs_type,
2968 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2969 {
2970 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2971 }
2972
2973 static struct file_system_type ext3_fs_type = {
2974 .owner = THIS_MODULE,
2975 .name = "ext3",
2976 .get_sb = ext3_get_sb,
2977 .kill_sb = kill_block_super,
2978 .fs_flags = FS_REQUIRES_DEV,
2979 };
2980
2981 static int __init init_ext3_fs(void)
2982 {
2983 int err = init_ext3_xattr();
2984 if (err)
2985 return err;
2986 err = init_inodecache();
2987 if (err)
2988 goto out1;
2989 err = register_filesystem(&ext3_fs_type);
2990 if (err)
2991 goto out;
2992 return 0;
2993 out:
2994 destroy_inodecache();
2995 out1:
2996 exit_ext3_xattr();
2997 return err;
2998 }
2999
3000 static void __exit exit_ext3_fs(void)
3001 {
3002 unregister_filesystem(&ext3_fs_type);
3003 destroy_inodecache();
3004 exit_ext3_xattr();
3005 }
3006
3007 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3008 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3009 MODULE_LICENSE("GPL");
3010 module_init(init_ext3_fs)
3011 module_exit(exit_ext3_fs)
kernel source for telekom puls (alcatel/mediatek)