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