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[POWERPC] 83xx: ipic: add interrupt vector 94
[linux-2.6/zen-sources.git] / fs / ext3 / super.c
blobcb14de1502c35783fd89d11f4b362cd28faaf91c
1 /*
2 * linux/fs/ext3/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19 #include <linux/module.h>
20 #include <linux/string.h>
21 #include <linux/fs.h>
22 #include <linux/time.h>
23 #include <linux/jbd.h>
24 #include <linux/ext3_fs.h>
25 #include <linux/ext3_jbd.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/blkdev.h>
29 #include <linux/parser.h>
30 #include <linux/smp_lock.h>
31 #include <linux/buffer_head.h>
32 #include <linux/exportfs.h>
33 #include <linux/vfs.h>
34 #include <linux/random.h>
35 #include <linux/mount.h>
36 #include <linux/namei.h>
37 #include <linux/quotaops.h>
38 #include <linux/seq_file.h>
39 #include <linux/log2.h>
40
41 #include <asm/uaccess.h>
42
43 #include "xattr.h"
44 #include "acl.h"
45 #include "namei.h"
46
47 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
48 unsigned long journal_devnum);
49 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
50 unsigned int);
51 static void ext3_commit_super (struct super_block * sb,
52 struct ext3_super_block * es,
53 int sync);
54 static void ext3_mark_recovery_complete(struct super_block * sb,
55 struct ext3_super_block * es);
56 static void ext3_clear_journal_err(struct super_block * sb,
57 struct ext3_super_block * es);
58 static int ext3_sync_fs(struct super_block *sb, int wait);
59 static const char *ext3_decode_error(struct super_block * sb, int errno,
60 char nbuf[16]);
61 static int ext3_remount (struct super_block * sb, int * flags, char * data);
62 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
63 static void ext3_unlockfs(struct super_block *sb);
64 static void ext3_write_super (struct super_block * sb);
65 static void ext3_write_super_lockfs(struct super_block *sb);
66
67 /*
68 * Wrappers for journal_start/end.
69 *
70 * The only special thing we need to do here is to make sure that all
71 * journal_end calls result in the superblock being marked dirty, so
72 * that sync() will call the filesystem's write_super callback if
73 * appropriate.
74 */
75 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
76 {
77 journal_t *journal;
78
79 if (sb->s_flags & MS_RDONLY)
80 return ERR_PTR(-EROFS);
81
82 /* Special case here: if the journal has aborted behind our
83 * backs (eg. EIO in the commit thread), then we still need to
84 * take the FS itself readonly cleanly. */
85 journal = EXT3_SB(sb)->s_journal;
86 if (is_journal_aborted(journal)) {
87 ext3_abort(sb, __FUNCTION__,
88 "Detected aborted journal");
89 return ERR_PTR(-EROFS);
90 }
91
92 return journal_start(journal, nblocks);
93 }
94
95 /*
96 * The only special thing we need to do here is to make sure that all
97 * journal_stop calls result in the superblock being marked dirty, so
98 * that sync() will call the filesystem's write_super callback if
99 * appropriate.
100 */
101 int __ext3_journal_stop(const char *where, handle_t *handle)
102 {
103 struct super_block *sb;
104 int err;
105 int rc;
106
107 sb = handle->h_transaction->t_journal->j_private;
108 err = handle->h_err;
109 rc = journal_stop(handle);
110
111 if (!err)
112 err = rc;
113 if (err)
114 __ext3_std_error(sb, where, err);
115 return err;
116 }
117
118 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
119 struct buffer_head *bh, handle_t *handle, int err)
120 {
121 char nbuf[16];
122 const char *errstr = ext3_decode_error(NULL, err, nbuf);
123
124 if (bh)
125 BUFFER_TRACE(bh, "abort");
126
127 if (!handle->h_err)
128 handle->h_err = err;
129
130 if (is_handle_aborted(handle))
131 return;
132
133 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
134 caller, errstr, err_fn);
135
136 journal_abort_handle(handle);
137 }
138
139 /* Deal with the reporting of failure conditions on a filesystem such as
140 * inconsistencies detected or read IO failures.
141 *
142 * On ext2, we can store the error state of the filesystem in the
143 * superblock. That is not possible on ext3, because we may have other
144 * write ordering constraints on the superblock which prevent us from
145 * writing it out straight away; and given that the journal is about to
146 * be aborted, we can't rely on the current, or future, transactions to
147 * write out the superblock safely.
148 *
149 * We'll just use the journal_abort() error code to record an error in
150 * the journal instead. On recovery, the journal will compain about
151 * that error until we've noted it down and cleared it.
152 */
153
154 static void ext3_handle_error(struct super_block *sb)
155 {
156 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
157
158 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
159 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
160
161 if (sb->s_flags & MS_RDONLY)
162 return;
163
164 if (!test_opt (sb, ERRORS_CONT)) {
165 journal_t *journal = EXT3_SB(sb)->s_journal;
166
167 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
168 if (journal)
169 journal_abort(journal, -EIO);
170 }
171 if (test_opt (sb, ERRORS_RO)) {
172 printk (KERN_CRIT "Remounting filesystem read-only\n");
173 sb->s_flags |= MS_RDONLY;
174 }
175 ext3_commit_super(sb, es, 1);
176 if (test_opt(sb, ERRORS_PANIC))
177 panic("EXT3-fs (device %s): panic forced after error\n",
178 sb->s_id);
179 }
180
181 void ext3_error (struct super_block * sb, const char * function,
182 const char * fmt, ...)
183 {
184 va_list args;
185
186 va_start(args, fmt);
187 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
188 vprintk(fmt, args);
189 printk("\n");
190 va_end(args);
191
192 ext3_handle_error(sb);
193 }
194
195 static const char *ext3_decode_error(struct super_block * sb, int errno,
196 char nbuf[16])
197 {
198 char *errstr = NULL;
199
200 switch (errno) {
201 case -EIO:
202 errstr = "IO failure";
203 break;
204 case -ENOMEM:
205 errstr = "Out of memory";
206 break;
207 case -EROFS:
208 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
209 errstr = "Journal has aborted";
210 else
211 errstr = "Readonly filesystem";
212 break;
213 default:
214 /* If the caller passed in an extra buffer for unknown
215 * errors, textualise them now. Else we just return
216 * NULL. */
217 if (nbuf) {
218 /* Check for truncated error codes... */
219 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
220 errstr = nbuf;
221 }
222 break;
223 }
224
225 return errstr;
226 }
227
228 /* __ext3_std_error decodes expected errors from journaling functions
229 * automatically and invokes the appropriate error response. */
230
231 void __ext3_std_error (struct super_block * sb, const char * function,
232 int errno)
233 {
234 char nbuf[16];
235 const char *errstr;
236
237 /* Special case: if the error is EROFS, and we're not already
238 * inside a transaction, then there's really no point in logging
239 * an error. */
240 if (errno == -EROFS && journal_current_handle() == NULL &&
241 (sb->s_flags & MS_RDONLY))
242 return;
243
244 errstr = ext3_decode_error(sb, errno, nbuf);
245 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
246 sb->s_id, function, errstr);
247
248 ext3_handle_error(sb);
249 }
250
251 /*
252 * ext3_abort is a much stronger failure handler than ext3_error. The
253 * abort function may be used to deal with unrecoverable failures such
254 * as journal IO errors or ENOMEM at a critical moment in log management.
255 *
256 * We unconditionally force the filesystem into an ABORT|READONLY state,
257 * unless the error response on the fs has been set to panic in which
258 * case we take the easy way out and panic immediately.
259 */
260
261 void ext3_abort (struct super_block * sb, const char * function,
262 const char * fmt, ...)
263 {
264 va_list args;
265
266 printk (KERN_CRIT "ext3_abort called.\n");
267
268 va_start(args, fmt);
269 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
270 vprintk(fmt, args);
271 printk("\n");
272 va_end(args);
273
274 if (test_opt(sb, ERRORS_PANIC))
275 panic("EXT3-fs panic from previous error\n");
276
277 if (sb->s_flags & MS_RDONLY)
278 return;
279
280 printk(KERN_CRIT "Remounting filesystem read-only\n");
281 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
282 sb->s_flags |= MS_RDONLY;
283 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
284 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
285 }
286
287 void ext3_warning (struct super_block * sb, const char * function,
288 const char * fmt, ...)
289 {
290 va_list args;
291
292 va_start(args, fmt);
293 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
294 sb->s_id, function);
295 vprintk(fmt, args);
296 printk("\n");
297 va_end(args);
298 }
299
300 void ext3_update_dynamic_rev(struct super_block *sb)
301 {
302 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
303
304 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
305 return;
306
307 ext3_warning(sb, __FUNCTION__,
308 "updating to rev %d because of new feature flag, "
309 "running e2fsck is recommended",
310 EXT3_DYNAMIC_REV);
311
312 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
313 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
314 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
315 /* leave es->s_feature_*compat flags alone */
316 /* es->s_uuid will be set by e2fsck if empty */
317
318 /*
319 * The rest of the superblock fields should be zero, and if not it
320 * means they are likely already in use, so leave them alone. We
321 * can leave it up to e2fsck to clean up any inconsistencies there.
322 */
323 }
324
325 /*
326 * Open the external journal device
327 */
328 static struct block_device *ext3_blkdev_get(dev_t dev)
329 {
330 struct block_device *bdev;
331 char b[BDEVNAME_SIZE];
332
333 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
334 if (IS_ERR(bdev))
335 goto fail;
336 return bdev;
337
338 fail:
339 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
340 __bdevname(dev, b), PTR_ERR(bdev));
341 return NULL;
342 }
343
344 /*
345 * Release the journal device
346 */
347 static int ext3_blkdev_put(struct block_device *bdev)
348 {
349 bd_release(bdev);
350 return blkdev_put(bdev);
351 }
352
353 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
354 {
355 struct block_device *bdev;
356 int ret = -ENODEV;
357
358 bdev = sbi->journal_bdev;
359 if (bdev) {
360 ret = ext3_blkdev_put(bdev);
361 sbi->journal_bdev = NULL;
362 }
363 return ret;
364 }
365
366 static inline struct inode *orphan_list_entry(struct list_head *l)
367 {
368 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
369 }
370
371 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
372 {
373 struct list_head *l;
374
375 printk(KERN_ERR "sb orphan head is %d\n",
376 le32_to_cpu(sbi->s_es->s_last_orphan));
377
378 printk(KERN_ERR "sb_info orphan list:\n");
379 list_for_each(l, &sbi->s_orphan) {
380 struct inode *inode = orphan_list_entry(l);
381 printk(KERN_ERR " "
382 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
383 inode->i_sb->s_id, inode->i_ino, inode,
384 inode->i_mode, inode->i_nlink,
385 NEXT_ORPHAN(inode));
386 }
387 }
388
389 static void ext3_put_super (struct super_block * sb)
390 {
391 struct ext3_sb_info *sbi = EXT3_SB(sb);
392 struct ext3_super_block *es = sbi->s_es;
393 int i;
394
395 ext3_xattr_put_super(sb);
396 journal_destroy(sbi->s_journal);
397 if (!(sb->s_flags & MS_RDONLY)) {
398 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
399 es->s_state = cpu_to_le16(sbi->s_mount_state);
400 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
401 mark_buffer_dirty(sbi->s_sbh);
402 ext3_commit_super(sb, es, 1);
403 }
404
405 for (i = 0; i < sbi->s_gdb_count; i++)
406 brelse(sbi->s_group_desc[i]);
407 kfree(sbi->s_group_desc);
408 percpu_counter_destroy(&sbi->s_freeblocks_counter);
409 percpu_counter_destroy(&sbi->s_freeinodes_counter);
410 percpu_counter_destroy(&sbi->s_dirs_counter);
411 brelse(sbi->s_sbh);
412 #ifdef CONFIG_QUOTA
413 for (i = 0; i < MAXQUOTAS; i++)
414 kfree(sbi->s_qf_names[i]);
415 #endif
416
417 /* Debugging code just in case the in-memory inode orphan list
418 * isn't empty. The on-disk one can be non-empty if we've
419 * detected an error and taken the fs readonly, but the
420 * in-memory list had better be clean by this point. */
421 if (!list_empty(&sbi->s_orphan))
422 dump_orphan_list(sb, sbi);
423 J_ASSERT(list_empty(&sbi->s_orphan));
424
425 invalidate_bdev(sb->s_bdev);
426 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
427 /*
428 * Invalidate the journal device's buffers. We don't want them
429 * floating about in memory - the physical journal device may
430 * hotswapped, and it breaks the `ro-after' testing code.
431 */
432 sync_blockdev(sbi->journal_bdev);
433 invalidate_bdev(sbi->journal_bdev);
434 ext3_blkdev_remove(sbi);
435 }
436 sb->s_fs_info = NULL;
437 kfree(sbi);
438 return;
439 }
440
441 static struct kmem_cache *ext3_inode_cachep;
442
443 /*
444 * Called inside transaction, so use GFP_NOFS
445 */
446 static struct inode *ext3_alloc_inode(struct super_block *sb)
447 {
448 struct ext3_inode_info *ei;
449
450 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
451 if (!ei)
452 return NULL;
453 #ifdef CONFIG_EXT3_FS_POSIX_ACL
454 ei->i_acl = EXT3_ACL_NOT_CACHED;
455 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
456 #endif
457 ei->i_block_alloc_info = NULL;
458 ei->vfs_inode.i_version = 1;
459 return &ei->vfs_inode;
460 }
461
462 static void ext3_destroy_inode(struct inode *inode)
463 {
464 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
465 printk("EXT3 Inode %p: orphan list check failed!\n",
466 EXT3_I(inode));
467 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
468 EXT3_I(inode), sizeof(struct ext3_inode_info),
469 false);
470 dump_stack();
471 }
472 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
473 }
474
475 static void init_once(struct kmem_cache * cachep, void *foo)
476 {
477 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
478
479 INIT_LIST_HEAD(&ei->i_orphan);
480 #ifdef CONFIG_EXT3_FS_XATTR
481 init_rwsem(&ei->xattr_sem);
482 #endif
483 mutex_init(&ei->truncate_mutex);
484 inode_init_once(&ei->vfs_inode);
485 }
486
487 static int init_inodecache(void)
488 {
489 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
490 sizeof(struct ext3_inode_info),
491 0, (SLAB_RECLAIM_ACCOUNT|
492 SLAB_MEM_SPREAD),
493 init_once);
494 if (ext3_inode_cachep == NULL)
495 return -ENOMEM;
496 return 0;
497 }
498
499 static void destroy_inodecache(void)
500 {
501 kmem_cache_destroy(ext3_inode_cachep);
502 }
503
504 static void ext3_clear_inode(struct inode *inode)
505 {
506 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
507 #ifdef CONFIG_EXT3_FS_POSIX_ACL
508 if (EXT3_I(inode)->i_acl &&
509 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
510 posix_acl_release(EXT3_I(inode)->i_acl);
511 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
512 }
513 if (EXT3_I(inode)->i_default_acl &&
514 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
515 posix_acl_release(EXT3_I(inode)->i_default_acl);
516 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
517 }
518 #endif
519 ext3_discard_reservation(inode);
520 EXT3_I(inode)->i_block_alloc_info = NULL;
521 if (unlikely(rsv))
522 kfree(rsv);
523 }
524
525 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
526 {
527 #if defined(CONFIG_QUOTA)
528 struct ext3_sb_info *sbi = EXT3_SB(sb);
529
530 if (sbi->s_jquota_fmt)
531 seq_printf(seq, ",jqfmt=%s",
532 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
533
534 if (sbi->s_qf_names[USRQUOTA])
535 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
536
537 if (sbi->s_qf_names[GRPQUOTA])
538 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
539
540 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
541 seq_puts(seq, ",usrquota");
542
543 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
544 seq_puts(seq, ",grpquota");
545 #endif
546 }
547
548 /*
549 * Show an option if
550 * - it's set to a non-default value OR
551 * - if the per-sb default is different from the global default
552 */
553 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
554 {
555 struct super_block *sb = vfs->mnt_sb;
556 struct ext3_sb_info *sbi = EXT3_SB(sb);
557 struct ext3_super_block *es = sbi->s_es;
558 unsigned long def_mount_opts;
559
560 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
561
562 if (sbi->s_sb_block != 1)
563 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
564 if (test_opt(sb, MINIX_DF))
565 seq_puts(seq, ",minixdf");
566 if (test_opt(sb, GRPID))
567 seq_puts(seq, ",grpid");
568 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
569 seq_puts(seq, ",nogrpid");
570 if (sbi->s_resuid != EXT3_DEF_RESUID ||
571 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
572 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
573 }
574 if (sbi->s_resgid != EXT3_DEF_RESGID ||
575 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
576 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
577 }
578 if (test_opt(sb, ERRORS_CONT)) {
579 int def_errors = le16_to_cpu(es->s_errors);
580
581 if (def_errors == EXT3_ERRORS_PANIC ||
582 def_errors == EXT3_ERRORS_RO) {
583 seq_puts(seq, ",errors=continue");
584 }
585 }
586 if (test_opt(sb, ERRORS_RO))
587 seq_puts(seq, ",errors=remount-ro");
588 if (test_opt(sb, ERRORS_PANIC))
589 seq_puts(seq, ",errors=panic");
590 if (test_opt(sb, NO_UID32))
591 seq_puts(seq, ",nouid32");
592 if (test_opt(sb, DEBUG))
593 seq_puts(seq, ",debug");
594 if (test_opt(sb, OLDALLOC))
595 seq_puts(seq, ",oldalloc");
596 #ifdef CONFIG_EXT3_FS_XATTR
597 if (test_opt(sb, XATTR_USER))
598 seq_puts(seq, ",user_xattr");
599 if (!test_opt(sb, XATTR_USER) &&
600 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
601 seq_puts(seq, ",nouser_xattr");
602 }
603 #endif
604 #ifdef CONFIG_EXT3_FS_POSIX_ACL
605 if (test_opt(sb, POSIX_ACL))
606 seq_puts(seq, ",acl");
607 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
608 seq_puts(seq, ",noacl");
609 #endif
610 if (!test_opt(sb, RESERVATION))
611 seq_puts(seq, ",noreservation");
612 if (sbi->s_commit_interval) {
613 seq_printf(seq, ",commit=%u",
614 (unsigned) (sbi->s_commit_interval / HZ));
615 }
616 if (test_opt(sb, BARRIER))
617 seq_puts(seq, ",barrier=1");
618 if (test_opt(sb, NOBH))
619 seq_puts(seq, ",nobh");
620
621 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
622 seq_puts(seq, ",data=journal");
623 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
624 seq_puts(seq, ",data=ordered");
625 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
626 seq_puts(seq, ",data=writeback");
627
628 ext3_show_quota_options(seq, sb);
629
630 return 0;
631 }
632
633
634 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
635 u64 ino, u32 generation)
636 {
637 struct inode *inode;
638
639 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
640 return ERR_PTR(-ESTALE);
641 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
642 return ERR_PTR(-ESTALE);
643
644 /* iget isn't really right if the inode is currently unallocated!!
645 *
646 * ext3_read_inode will return a bad_inode if the inode had been
647 * deleted, so we should be safe.
648 *
649 * Currently we don't know the generation for parent directory, so
650 * a generation of 0 means "accept any"
651 */
652 inode = iget(sb, ino);
653 if (inode == NULL)
654 return ERR_PTR(-ENOMEM);
655 if (is_bad_inode(inode) ||
656 (generation && inode->i_generation != generation)) {
657 iput(inode);
658 return ERR_PTR(-ESTALE);
659 }
660
661 return inode;
662 }
663
664 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
665 int fh_len, int fh_type)
666 {
667 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
668 ext3_nfs_get_inode);
669 }
670
671 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
672 int fh_len, int fh_type)
673 {
674 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
675 ext3_nfs_get_inode);
676 }
677
678 #ifdef CONFIG_QUOTA
679 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
680 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
681
682 static int ext3_dquot_initialize(struct inode *inode, int type);
683 static int ext3_dquot_drop(struct inode *inode);
684 static int ext3_write_dquot(struct dquot *dquot);
685 static int ext3_acquire_dquot(struct dquot *dquot);
686 static int ext3_release_dquot(struct dquot *dquot);
687 static int ext3_mark_dquot_dirty(struct dquot *dquot);
688 static int ext3_write_info(struct super_block *sb, int type);
689 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
690 static int ext3_quota_on_mount(struct super_block *sb, int type);
691 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
692 size_t len, loff_t off);
693 static ssize_t ext3_quota_write(struct super_block *sb, int type,
694 const char *data, size_t len, loff_t off);
695
696 static struct dquot_operations ext3_quota_operations = {
697 .initialize = ext3_dquot_initialize,
698 .drop = ext3_dquot_drop,
699 .alloc_space = dquot_alloc_space,
700 .alloc_inode = dquot_alloc_inode,
701 .free_space = dquot_free_space,
702 .free_inode = dquot_free_inode,
703 .transfer = dquot_transfer,
704 .write_dquot = ext3_write_dquot,
705 .acquire_dquot = ext3_acquire_dquot,
706 .release_dquot = ext3_release_dquot,
707 .mark_dirty = ext3_mark_dquot_dirty,
708 .write_info = ext3_write_info
709 };
710
711 static struct quotactl_ops ext3_qctl_operations = {
712 .quota_on = ext3_quota_on,
713 .quota_off = vfs_quota_off,
714 .quota_sync = vfs_quota_sync,
715 .get_info = vfs_get_dqinfo,
716 .set_info = vfs_set_dqinfo,
717 .get_dqblk = vfs_get_dqblk,
718 .set_dqblk = vfs_set_dqblk
719 };
720 #endif
721
722 static const struct super_operations ext3_sops = {
723 .alloc_inode = ext3_alloc_inode,
724 .destroy_inode = ext3_destroy_inode,
725 .read_inode = ext3_read_inode,
726 .write_inode = ext3_write_inode,
727 .dirty_inode = ext3_dirty_inode,
728 .delete_inode = ext3_delete_inode,
729 .put_super = ext3_put_super,
730 .write_super = ext3_write_super,
731 .sync_fs = ext3_sync_fs,
732 .write_super_lockfs = ext3_write_super_lockfs,
733 .unlockfs = ext3_unlockfs,
734 .statfs = ext3_statfs,
735 .remount_fs = ext3_remount,
736 .clear_inode = ext3_clear_inode,
737 .show_options = ext3_show_options,
738 #ifdef CONFIG_QUOTA
739 .quota_read = ext3_quota_read,
740 .quota_write = ext3_quota_write,
741 #endif
742 };
743
744 static const struct export_operations ext3_export_ops = {
745 .fh_to_dentry = ext3_fh_to_dentry,
746 .fh_to_parent = ext3_fh_to_parent,
747 .get_parent = ext3_get_parent,
748 };
749
750 enum {
751 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
752 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
753 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
754 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
755 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
756 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
757 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
758 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
759 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
760 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
761 Opt_grpquota
762 };
763
764 static match_table_t tokens = {
765 {Opt_bsd_df, "bsddf"},
766 {Opt_minix_df, "minixdf"},
767 {Opt_grpid, "grpid"},
768 {Opt_grpid, "bsdgroups"},
769 {Opt_nogrpid, "nogrpid"},
770 {Opt_nogrpid, "sysvgroups"},
771 {Opt_resgid, "resgid=%u"},
772 {Opt_resuid, "resuid=%u"},
773 {Opt_sb, "sb=%u"},
774 {Opt_err_cont, "errors=continue"},
775 {Opt_err_panic, "errors=panic"},
776 {Opt_err_ro, "errors=remount-ro"},
777 {Opt_nouid32, "nouid32"},
778 {Opt_nocheck, "nocheck"},
779 {Opt_nocheck, "check=none"},
780 {Opt_debug, "debug"},
781 {Opt_oldalloc, "oldalloc"},
782 {Opt_orlov, "orlov"},
783 {Opt_user_xattr, "user_xattr"},
784 {Opt_nouser_xattr, "nouser_xattr"},
785 {Opt_acl, "acl"},
786 {Opt_noacl, "noacl"},
787 {Opt_reservation, "reservation"},
788 {Opt_noreservation, "noreservation"},
789 {Opt_noload, "noload"},
790 {Opt_nobh, "nobh"},
791 {Opt_bh, "bh"},
792 {Opt_commit, "commit=%u"},
793 {Opt_journal_update, "journal=update"},
794 {Opt_journal_inum, "journal=%u"},
795 {Opt_journal_dev, "journal_dev=%u"},
796 {Opt_abort, "abort"},
797 {Opt_data_journal, "data=journal"},
798 {Opt_data_ordered, "data=ordered"},
799 {Opt_data_writeback, "data=writeback"},
800 {Opt_offusrjquota, "usrjquota="},
801 {Opt_usrjquota, "usrjquota=%s"},
802 {Opt_offgrpjquota, "grpjquota="},
803 {Opt_grpjquota, "grpjquota=%s"},
804 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
805 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
806 {Opt_grpquota, "grpquota"},
807 {Opt_noquota, "noquota"},
808 {Opt_quota, "quota"},
809 {Opt_usrquota, "usrquota"},
810 {Opt_barrier, "barrier=%u"},
811 {Opt_err, NULL},
812 {Opt_resize, "resize"},
813 };
814
815 static ext3_fsblk_t get_sb_block(void **data)
816 {
817 ext3_fsblk_t sb_block;
818 char *options = (char *) *data;
819
820 if (!options || strncmp(options, "sb=", 3) != 0)
821 return 1; /* Default location */
822 options += 3;
823 /*todo: use simple_strtoll with >32bit ext3 */
824 sb_block = simple_strtoul(options, &options, 0);
825 if (*options && *options != ',') {
826 printk("EXT3-fs: Invalid sb specification: %s\n",
827 (char *) *data);
828 return 1;
829 }
830 if (*options == ',')
831 options++;
832 *data = (void *) options;
833 return sb_block;
834 }
835
836 static int parse_options (char *options, struct super_block *sb,
837 unsigned int *inum, unsigned long *journal_devnum,
838 ext3_fsblk_t *n_blocks_count, int is_remount)
839 {
840 struct ext3_sb_info *sbi = EXT3_SB(sb);
841 char * p;
842 substring_t args[MAX_OPT_ARGS];
843 int data_opt = 0;
844 int option;
845 #ifdef CONFIG_QUOTA
846 int qtype;
847 char *qname;
848 #endif
849
850 if (!options)
851 return 1;
852
853 while ((p = strsep (&options, ",")) != NULL) {
854 int token;
855 if (!*p)
856 continue;
857
858 token = match_token(p, tokens, args);
859 switch (token) {
860 case Opt_bsd_df:
861 clear_opt (sbi->s_mount_opt, MINIX_DF);
862 break;
863 case Opt_minix_df:
864 set_opt (sbi->s_mount_opt, MINIX_DF);
865 break;
866 case Opt_grpid:
867 set_opt (sbi->s_mount_opt, GRPID);
868 break;
869 case Opt_nogrpid:
870 clear_opt (sbi->s_mount_opt, GRPID);
871 break;
872 case Opt_resuid:
873 if (match_int(&args[0], &option))
874 return 0;
875 sbi->s_resuid = option;
876 break;
877 case Opt_resgid:
878 if (match_int(&args[0], &option))
879 return 0;
880 sbi->s_resgid = option;
881 break;
882 case Opt_sb:
883 /* handled by get_sb_block() instead of here */
884 /* *sb_block = match_int(&args[0]); */
885 break;
886 case Opt_err_panic:
887 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
888 clear_opt (sbi->s_mount_opt, ERRORS_RO);
889 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
890 break;
891 case Opt_err_ro:
892 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
893 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
894 set_opt (sbi->s_mount_opt, ERRORS_RO);
895 break;
896 case Opt_err_cont:
897 clear_opt (sbi->s_mount_opt, ERRORS_RO);
898 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
899 set_opt (sbi->s_mount_opt, ERRORS_CONT);
900 break;
901 case Opt_nouid32:
902 set_opt (sbi->s_mount_opt, NO_UID32);
903 break;
904 case Opt_nocheck:
905 clear_opt (sbi->s_mount_opt, CHECK);
906 break;
907 case Opt_debug:
908 set_opt (sbi->s_mount_opt, DEBUG);
909 break;
910 case Opt_oldalloc:
911 set_opt (sbi->s_mount_opt, OLDALLOC);
912 break;
913 case Opt_orlov:
914 clear_opt (sbi->s_mount_opt, OLDALLOC);
915 break;
916 #ifdef CONFIG_EXT3_FS_XATTR
917 case Opt_user_xattr:
918 set_opt (sbi->s_mount_opt, XATTR_USER);
919 break;
920 case Opt_nouser_xattr:
921 clear_opt (sbi->s_mount_opt, XATTR_USER);
922 break;
923 #else
924 case Opt_user_xattr:
925 case Opt_nouser_xattr:
926 printk("EXT3 (no)user_xattr options not supported\n");
927 break;
928 #endif
929 #ifdef CONFIG_EXT3_FS_POSIX_ACL
930 case Opt_acl:
931 set_opt(sbi->s_mount_opt, POSIX_ACL);
932 break;
933 case Opt_noacl:
934 clear_opt(sbi->s_mount_opt, POSIX_ACL);
935 break;
936 #else
937 case Opt_acl:
938 case Opt_noacl:
939 printk("EXT3 (no)acl options not supported\n");
940 break;
941 #endif
942 case Opt_reservation:
943 set_opt(sbi->s_mount_opt, RESERVATION);
944 break;
945 case Opt_noreservation:
946 clear_opt(sbi->s_mount_opt, RESERVATION);
947 break;
948 case Opt_journal_update:
949 /* @@@ FIXME */
950 /* Eventually we will want to be able to create
951 a journal file here. For now, only allow the
952 user to specify an existing inode to be the
953 journal file. */
954 if (is_remount) {
955 printk(KERN_ERR "EXT3-fs: cannot specify "
956 "journal on remount\n");
957 return 0;
958 }
959 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
960 break;
961 case Opt_journal_inum:
962 if (is_remount) {
963 printk(KERN_ERR "EXT3-fs: cannot specify "
964 "journal on remount\n");
965 return 0;
966 }
967 if (match_int(&args[0], &option))
968 return 0;
969 *inum = option;
970 break;
971 case Opt_journal_dev:
972 if (is_remount) {
973 printk(KERN_ERR "EXT3-fs: cannot specify "
974 "journal on remount\n");
975 return 0;
976 }
977 if (match_int(&args[0], &option))
978 return 0;
979 *journal_devnum = option;
980 break;
981 case Opt_noload:
982 set_opt (sbi->s_mount_opt, NOLOAD);
983 break;
984 case Opt_commit:
985 if (match_int(&args[0], &option))
986 return 0;
987 if (option < 0)
988 return 0;
989 if (option == 0)
990 option = JBD_DEFAULT_MAX_COMMIT_AGE;
991 sbi->s_commit_interval = HZ * option;
992 break;
993 case Opt_data_journal:
994 data_opt = EXT3_MOUNT_JOURNAL_DATA;
995 goto datacheck;
996 case Opt_data_ordered:
997 data_opt = EXT3_MOUNT_ORDERED_DATA;
998 goto datacheck;
999 case Opt_data_writeback:
1000 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1001 datacheck:
1002 if (is_remount) {
1003 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1004 != data_opt) {
1005 printk(KERN_ERR
1006 "EXT3-fs: cannot change data "
1007 "mode on remount\n");
1008 return 0;
1009 }
1010 } else {
1011 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1012 sbi->s_mount_opt |= data_opt;
1013 }
1014 break;
1015 #ifdef CONFIG_QUOTA
1016 case Opt_usrjquota:
1017 qtype = USRQUOTA;
1018 goto set_qf_name;
1019 case Opt_grpjquota:
1020 qtype = GRPQUOTA;
1021 set_qf_name:
1022 if (sb_any_quota_enabled(sb)) {
1023 printk(KERN_ERR
1024 "EXT3-fs: Cannot change journalled "
1025 "quota options when quota turned on.\n");
1026 return 0;
1027 }
1028 qname = match_strdup(&args[0]);
1029 if (!qname) {
1030 printk(KERN_ERR
1031 "EXT3-fs: not enough memory for "
1032 "storing quotafile name.\n");
1033 return 0;
1034 }
1035 if (sbi->s_qf_names[qtype] &&
1036 strcmp(sbi->s_qf_names[qtype], qname)) {
1037 printk(KERN_ERR
1038 "EXT3-fs: %s quota file already "
1039 "specified.\n", QTYPE2NAME(qtype));
1040 kfree(qname);
1041 return 0;
1042 }
1043 sbi->s_qf_names[qtype] = qname;
1044 if (strchr(sbi->s_qf_names[qtype], '/')) {
1045 printk(KERN_ERR
1046 "EXT3-fs: quotafile must be on "
1047 "filesystem root.\n");
1048 kfree(sbi->s_qf_names[qtype]);
1049 sbi->s_qf_names[qtype] = NULL;
1050 return 0;
1051 }
1052 set_opt(sbi->s_mount_opt, QUOTA);
1053 break;
1054 case Opt_offusrjquota:
1055 qtype = USRQUOTA;
1056 goto clear_qf_name;
1057 case Opt_offgrpjquota:
1058 qtype = GRPQUOTA;
1059 clear_qf_name:
1060 if (sb_any_quota_enabled(sb)) {
1061 printk(KERN_ERR "EXT3-fs: Cannot change "
1062 "journalled quota options when "
1063 "quota turned on.\n");
1064 return 0;
1065 }
1066 /*
1067 * The space will be released later when all options
1068 * are confirmed to be correct
1069 */
1070 sbi->s_qf_names[qtype] = NULL;
1071 break;
1072 case Opt_jqfmt_vfsold:
1073 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1074 break;
1075 case Opt_jqfmt_vfsv0:
1076 sbi->s_jquota_fmt = QFMT_VFS_V0;
1077 break;
1078 case Opt_quota:
1079 case Opt_usrquota:
1080 set_opt(sbi->s_mount_opt, QUOTA);
1081 set_opt(sbi->s_mount_opt, USRQUOTA);
1082 break;
1083 case Opt_grpquota:
1084 set_opt(sbi->s_mount_opt, QUOTA);
1085 set_opt(sbi->s_mount_opt, GRPQUOTA);
1086 break;
1087 case Opt_noquota:
1088 if (sb_any_quota_enabled(sb)) {
1089 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1090 "options when quota turned on.\n");
1091 return 0;
1092 }
1093 clear_opt(sbi->s_mount_opt, QUOTA);
1094 clear_opt(sbi->s_mount_opt, USRQUOTA);
1095 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1096 break;
1097 #else
1098 case Opt_quota:
1099 case Opt_usrquota:
1100 case Opt_grpquota:
1101 case Opt_usrjquota:
1102 case Opt_grpjquota:
1103 case Opt_offusrjquota:
1104 case Opt_offgrpjquota:
1105 case Opt_jqfmt_vfsold:
1106 case Opt_jqfmt_vfsv0:
1107 printk(KERN_ERR
1108 "EXT3-fs: journalled quota options not "
1109 "supported.\n");
1110 break;
1111 case Opt_noquota:
1112 break;
1113 #endif
1114 case Opt_abort:
1115 set_opt(sbi->s_mount_opt, ABORT);
1116 break;
1117 case Opt_barrier:
1118 if (match_int(&args[0], &option))
1119 return 0;
1120 if (option)
1121 set_opt(sbi->s_mount_opt, BARRIER);
1122 else
1123 clear_opt(sbi->s_mount_opt, BARRIER);
1124 break;
1125 case Opt_ignore:
1126 break;
1127 case Opt_resize:
1128 if (!is_remount) {
1129 printk("EXT3-fs: resize option only available "
1130 "for remount\n");
1131 return 0;
1132 }
1133 if (match_int(&args[0], &option) != 0)
1134 return 0;
1135 *n_blocks_count = option;
1136 break;
1137 case Opt_nobh:
1138 set_opt(sbi->s_mount_opt, NOBH);
1139 break;
1140 case Opt_bh:
1141 clear_opt(sbi->s_mount_opt, NOBH);
1142 break;
1143 default:
1144 printk (KERN_ERR
1145 "EXT3-fs: Unrecognized mount option \"%s\" "
1146 "or missing value\n", p);
1147 return 0;
1148 }
1149 }
1150 #ifdef CONFIG_QUOTA
1151 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1152 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1153 sbi->s_qf_names[USRQUOTA])
1154 clear_opt(sbi->s_mount_opt, USRQUOTA);
1155
1156 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1157 sbi->s_qf_names[GRPQUOTA])
1158 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1159
1160 if ((sbi->s_qf_names[USRQUOTA] &&
1161 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1162 (sbi->s_qf_names[GRPQUOTA] &&
1163 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1164 printk(KERN_ERR "EXT3-fs: old and new quota "
1165 "format mixing.\n");
1166 return 0;
1167 }
1168
1169 if (!sbi->s_jquota_fmt) {
1170 printk(KERN_ERR "EXT3-fs: journalled quota format "
1171 "not specified.\n");
1172 return 0;
1173 }
1174 } else {
1175 if (sbi->s_jquota_fmt) {
1176 printk(KERN_ERR "EXT3-fs: journalled quota format "
1177 "specified with no journalling "
1178 "enabled.\n");
1179 return 0;
1180 }
1181 }
1182 #endif
1183 return 1;
1184 }
1185
1186 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1187 int read_only)
1188 {
1189 struct ext3_sb_info *sbi = EXT3_SB(sb);
1190 int res = 0;
1191
1192 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1193 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1194 "forcing read-only mode\n");
1195 res = MS_RDONLY;
1196 }
1197 if (read_only)
1198 return res;
1199 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1200 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1201 "running e2fsck is recommended\n");
1202 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1203 printk (KERN_WARNING
1204 "EXT3-fs warning: mounting fs with errors, "
1205 "running e2fsck is recommended\n");
1206 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1207 le16_to_cpu(es->s_mnt_count) >=
1208 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1209 printk (KERN_WARNING
1210 "EXT3-fs warning: maximal mount count reached, "
1211 "running e2fsck is recommended\n");
1212 else if (le32_to_cpu(es->s_checkinterval) &&
1213 (le32_to_cpu(es->s_lastcheck) +
1214 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1215 printk (KERN_WARNING
1216 "EXT3-fs warning: checktime reached, "
1217 "running e2fsck is recommended\n");
1218 #if 0
1219 /* @@@ We _will_ want to clear the valid bit if we find
1220 inconsistencies, to force a fsck at reboot. But for
1221 a plain journaled filesystem we can keep it set as
1222 valid forever! :) */
1223 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1224 #endif
1225 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1226 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1227 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1228 es->s_mtime = cpu_to_le32(get_seconds());
1229 ext3_update_dynamic_rev(sb);
1230 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1231
1232 ext3_commit_super(sb, es, 1);
1233 if (test_opt(sb, DEBUG))
1234 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1235 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1236 sb->s_blocksize,
1237 sbi->s_groups_count,
1238 EXT3_BLOCKS_PER_GROUP(sb),
1239 EXT3_INODES_PER_GROUP(sb),
1240 sbi->s_mount_opt);
1241
1242 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1243 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1244 char b[BDEVNAME_SIZE];
1245
1246 printk("external journal on %s\n",
1247 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1248 } else {
1249 printk("internal journal\n");
1250 }
1251 return res;
1252 }
1253
1254 /* Called at mount-time, super-block is locked */
1255 static int ext3_check_descriptors (struct super_block * sb)
1256 {
1257 struct ext3_sb_info *sbi = EXT3_SB(sb);
1258 ext3_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1259 ext3_fsblk_t last_block;
1260 struct ext3_group_desc * gdp = NULL;
1261 int desc_block = 0;
1262 int i;
1263
1264 ext3_debug ("Checking group descriptors");
1265
1266 for (i = 0; i < sbi->s_groups_count; i++)
1267 {
1268 if (i == sbi->s_groups_count - 1)
1269 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1270 else
1271 last_block = first_block +
1272 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1273
1274 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1275 gdp = (struct ext3_group_desc *)
1276 sbi->s_group_desc[desc_block++]->b_data;
1277 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1278 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1279 {
1280 ext3_error (sb, "ext3_check_descriptors",
1281 "Block bitmap for group %d"
1282 " not in group (block %lu)!",
1283 i, (unsigned long)
1284 le32_to_cpu(gdp->bg_block_bitmap));
1285 return 0;
1286 }
1287 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1288 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1289 {
1290 ext3_error (sb, "ext3_check_descriptors",
1291 "Inode bitmap for group %d"
1292 " not in group (block %lu)!",
1293 i, (unsigned long)
1294 le32_to_cpu(gdp->bg_inode_bitmap));
1295 return 0;
1296 }
1297 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1298 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1299 last_block)
1300 {
1301 ext3_error (sb, "ext3_check_descriptors",
1302 "Inode table for group %d"
1303 " not in group (block %lu)!",
1304 i, (unsigned long)
1305 le32_to_cpu(gdp->bg_inode_table));
1306 return 0;
1307 }
1308 first_block += EXT3_BLOCKS_PER_GROUP(sb);
1309 gdp++;
1310 }
1311
1312 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1313 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1314 return 1;
1315 }
1316
1317
1318 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1319 * the superblock) which were deleted from all directories, but held open by
1320 * a process at the time of a crash. We walk the list and try to delete these
1321 * inodes at recovery time (only with a read-write filesystem).
1322 *
1323 * In order to keep the orphan inode chain consistent during traversal (in
1324 * case of crash during recovery), we link each inode into the superblock
1325 * orphan list_head and handle it the same way as an inode deletion during
1326 * normal operation (which journals the operations for us).
1327 *
1328 * We only do an iget() and an iput() on each inode, which is very safe if we
1329 * accidentally point at an in-use or already deleted inode. The worst that
1330 * can happen in this case is that we get a "bit already cleared" message from
1331 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1332 * e2fsck was run on this filesystem, and it must have already done the orphan
1333 * inode cleanup for us, so we can safely abort without any further action.
1334 */
1335 static void ext3_orphan_cleanup (struct super_block * sb,
1336 struct ext3_super_block * es)
1337 {
1338 unsigned int s_flags = sb->s_flags;
1339 int nr_orphans = 0, nr_truncates = 0;
1340 #ifdef CONFIG_QUOTA
1341 int i;
1342 #endif
1343 if (!es->s_last_orphan) {
1344 jbd_debug(4, "no orphan inodes to clean up\n");
1345 return;
1346 }
1347
1348 if (bdev_read_only(sb->s_bdev)) {
1349 printk(KERN_ERR "EXT3-fs: write access "
1350 "unavailable, skipping orphan cleanup.\n");
1351 return;
1352 }
1353
1354 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1355 if (es->s_last_orphan)
1356 jbd_debug(1, "Errors on filesystem, "
1357 "clearing orphan list.\n");
1358 es->s_last_orphan = 0;
1359 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1360 return;
1361 }
1362
1363 if (s_flags & MS_RDONLY) {
1364 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1365 sb->s_id);
1366 sb->s_flags &= ~MS_RDONLY;
1367 }
1368 #ifdef CONFIG_QUOTA
1369 /* Needed for iput() to work correctly and not trash data */
1370 sb->s_flags |= MS_ACTIVE;
1371 /* Turn on quotas so that they are updated correctly */
1372 for (i = 0; i < MAXQUOTAS; i++) {
1373 if (EXT3_SB(sb)->s_qf_names[i]) {
1374 int ret = ext3_quota_on_mount(sb, i);
1375 if (ret < 0)
1376 printk(KERN_ERR
1377 "EXT3-fs: Cannot turn on journalled "
1378 "quota: error %d\n", ret);
1379 }
1380 }
1381 #endif
1382
1383 while (es->s_last_orphan) {
1384 struct inode *inode;
1385
1386 if (!(inode =
1387 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1388 es->s_last_orphan = 0;
1389 break;
1390 }
1391
1392 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1393 DQUOT_INIT(inode);
1394 if (inode->i_nlink) {
1395 printk(KERN_DEBUG
1396 "%s: truncating inode %lu to %Ld bytes\n",
1397 __FUNCTION__, inode->i_ino, inode->i_size);
1398 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1399 inode->i_ino, inode->i_size);
1400 ext3_truncate(inode);
1401 nr_truncates++;
1402 } else {
1403 printk(KERN_DEBUG
1404 "%s: deleting unreferenced inode %lu\n",
1405 __FUNCTION__, inode->i_ino);
1406 jbd_debug(2, "deleting unreferenced inode %lu\n",
1407 inode->i_ino);
1408 nr_orphans++;
1409 }
1410 iput(inode); /* The delete magic happens here! */
1411 }
1412
1413 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1414
1415 if (nr_orphans)
1416 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1417 sb->s_id, PLURAL(nr_orphans));
1418 if (nr_truncates)
1419 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1420 sb->s_id, PLURAL(nr_truncates));
1421 #ifdef CONFIG_QUOTA
1422 /* Turn quotas off */
1423 for (i = 0; i < MAXQUOTAS; i++) {
1424 if (sb_dqopt(sb)->files[i])
1425 vfs_quota_off(sb, i);
1426 }
1427 #endif
1428 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1429 }
1430
1431 /*
1432 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1433 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1434 * We need to be 1 filesystem block less than the 2^32 sector limit.
1435 */
1436 static loff_t ext3_max_size(int bits)
1437 {
1438 loff_t res = EXT3_NDIR_BLOCKS;
1439 /* This constant is calculated to be the largest file size for a
1440 * dense, 4k-blocksize file such that the total number of
1441 * sectors in the file, including data and all indirect blocks,
1442 * does not exceed 2^32. */
1443 const loff_t upper_limit = 0x1ff7fffd000LL;
1444
1445 res += 1LL << (bits-2);
1446 res += 1LL << (2*(bits-2));
1447 res += 1LL << (3*(bits-2));
1448 res <<= bits;
1449 if (res > upper_limit)
1450 res = upper_limit;
1451 return res;
1452 }
1453
1454 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1455 ext3_fsblk_t logic_sb_block,
1456 int nr)
1457 {
1458 struct ext3_sb_info *sbi = EXT3_SB(sb);
1459 unsigned long bg, first_meta_bg;
1460 int has_super = 0;
1461
1462 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1463
1464 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1465 nr < first_meta_bg)
1466 return (logic_sb_block + nr + 1);
1467 bg = sbi->s_desc_per_block * nr;
1468 if (ext3_bg_has_super(sb, bg))
1469 has_super = 1;
1470 return (has_super + ext3_group_first_block_no(sb, bg));
1471 }
1472
1473
1474 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1475 {
1476 struct buffer_head * bh;
1477 struct ext3_super_block *es = NULL;
1478 struct ext3_sb_info *sbi;
1479 ext3_fsblk_t block;
1480 ext3_fsblk_t sb_block = get_sb_block(&data);
1481 ext3_fsblk_t logic_sb_block;
1482 unsigned long offset = 0;
1483 unsigned int journal_inum = 0;
1484 unsigned long journal_devnum = 0;
1485 unsigned long def_mount_opts;
1486 struct inode *root;
1487 int blocksize;
1488 int hblock;
1489 int db_count;
1490 int i;
1491 int needs_recovery;
1492 __le32 features;
1493 int err;
1494
1495 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1496 if (!sbi)
1497 return -ENOMEM;
1498 sb->s_fs_info = sbi;
1499 sbi->s_mount_opt = 0;
1500 sbi->s_resuid = EXT3_DEF_RESUID;
1501 sbi->s_resgid = EXT3_DEF_RESGID;
1502 sbi->s_sb_block = sb_block;
1503
1504 unlock_kernel();
1505
1506 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1507 if (!blocksize) {
1508 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1509 goto out_fail;
1510 }
1511
1512 /*
1513 * The ext3 superblock will not be buffer aligned for other than 1kB
1514 * block sizes. We need to calculate the offset from buffer start.
1515 */
1516 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1517 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1518 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1519 } else {
1520 logic_sb_block = sb_block;
1521 }
1522
1523 if (!(bh = sb_bread(sb, logic_sb_block))) {
1524 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1525 goto out_fail;
1526 }
1527 /*
1528 * Note: s_es must be initialized as soon as possible because
1529 * some ext3 macro-instructions depend on its value
1530 */
1531 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1532 sbi->s_es = es;
1533 sb->s_magic = le16_to_cpu(es->s_magic);
1534 if (sb->s_magic != EXT3_SUPER_MAGIC)
1535 goto cantfind_ext3;
1536
1537 /* Set defaults before we parse the mount options */
1538 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1539 if (def_mount_opts & EXT3_DEFM_DEBUG)
1540 set_opt(sbi->s_mount_opt, DEBUG);
1541 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1542 set_opt(sbi->s_mount_opt, GRPID);
1543 if (def_mount_opts & EXT3_DEFM_UID16)
1544 set_opt(sbi->s_mount_opt, NO_UID32);
1545 #ifdef CONFIG_EXT3_FS_XATTR
1546 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1547 set_opt(sbi->s_mount_opt, XATTR_USER);
1548 #endif
1549 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1550 if (def_mount_opts & EXT3_DEFM_ACL)
1551 set_opt(sbi->s_mount_opt, POSIX_ACL);
1552 #endif
1553 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1554 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1555 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1556 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1557 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1558 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1559
1560 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1561 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1562 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1563 set_opt(sbi->s_mount_opt, ERRORS_RO);
1564 else
1565 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1566
1567 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1568 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1569
1570 set_opt(sbi->s_mount_opt, RESERVATION);
1571
1572 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1573 NULL, 0))
1574 goto failed_mount;
1575
1576 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1577 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1578
1579 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1580 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1581 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1582 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1583 printk(KERN_WARNING
1584 "EXT3-fs warning: feature flags set on rev 0 fs, "
1585 "running e2fsck is recommended\n");
1586 /*
1587 * Check feature flags regardless of the revision level, since we
1588 * previously didn't change the revision level when setting the flags,
1589 * so there is a chance incompat flags are set on a rev 0 filesystem.
1590 */
1591 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1592 if (features) {
1593 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1594 "unsupported optional features (%x).\n",
1595 sb->s_id, le32_to_cpu(features));
1596 goto failed_mount;
1597 }
1598 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1599 if (!(sb->s_flags & MS_RDONLY) && features) {
1600 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1601 "unsupported optional features (%x).\n",
1602 sb->s_id, le32_to_cpu(features));
1603 goto failed_mount;
1604 }
1605 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1606
1607 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1608 blocksize > EXT3_MAX_BLOCK_SIZE) {
1609 printk(KERN_ERR
1610 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1611 blocksize, sb->s_id);
1612 goto failed_mount;
1613 }
1614
1615 hblock = bdev_hardsect_size(sb->s_bdev);
1616 if (sb->s_blocksize != blocksize) {
1617 /*
1618 * Make sure the blocksize for the filesystem is larger
1619 * than the hardware sectorsize for the machine.
1620 */
1621 if (blocksize < hblock) {
1622 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1623 "device blocksize %d.\n", blocksize, hblock);
1624 goto failed_mount;
1625 }
1626
1627 brelse (bh);
1628 if (!sb_set_blocksize(sb, blocksize)) {
1629 printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1630 blocksize);
1631 goto out_fail;
1632 }
1633 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1634 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1635 bh = sb_bread(sb, logic_sb_block);
1636 if (!bh) {
1637 printk(KERN_ERR
1638 "EXT3-fs: Can't read superblock on 2nd try.\n");
1639 goto failed_mount;
1640 }
1641 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1642 sbi->s_es = es;
1643 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1644 printk (KERN_ERR
1645 "EXT3-fs: Magic mismatch, very weird !\n");
1646 goto failed_mount;
1647 }
1648 }
1649
1650 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1651
1652 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1653 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1654 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1655 } else {
1656 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1657 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1658 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1659 (!is_power_of_2(sbi->s_inode_size)) ||
1660 (sbi->s_inode_size > blocksize)) {
1661 printk (KERN_ERR
1662 "EXT3-fs: unsupported inode size: %d\n",
1663 sbi->s_inode_size);
1664 goto failed_mount;
1665 }
1666 }
1667 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1668 le32_to_cpu(es->s_log_frag_size);
1669 if (blocksize != sbi->s_frag_size) {
1670 printk(KERN_ERR
1671 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1672 sbi->s_frag_size, blocksize);
1673 goto failed_mount;
1674 }
1675 sbi->s_frags_per_block = 1;
1676 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1677 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1678 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1679 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1680 goto cantfind_ext3;
1681 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1682 if (sbi->s_inodes_per_block == 0)
1683 goto cantfind_ext3;
1684 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1685 sbi->s_inodes_per_block;
1686 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1687 sbi->s_sbh = bh;
1688 sbi->s_mount_state = le16_to_cpu(es->s_state);
1689 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1690 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1691 for (i=0; i < 4; i++)
1692 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1693 sbi->s_def_hash_version = es->s_def_hash_version;
1694
1695 if (sbi->s_blocks_per_group > blocksize * 8) {
1696 printk (KERN_ERR
1697 "EXT3-fs: #blocks per group too big: %lu\n",
1698 sbi->s_blocks_per_group);
1699 goto failed_mount;
1700 }
1701 if (sbi->s_frags_per_group > blocksize * 8) {
1702 printk (KERN_ERR
1703 "EXT3-fs: #fragments per group too big: %lu\n",
1704 sbi->s_frags_per_group);
1705 goto failed_mount;
1706 }
1707 if (sbi->s_inodes_per_group > blocksize * 8) {
1708 printk (KERN_ERR
1709 "EXT3-fs: #inodes per group too big: %lu\n",
1710 sbi->s_inodes_per_group);
1711 goto failed_mount;
1712 }
1713
1714 if (le32_to_cpu(es->s_blocks_count) >
1715 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1716 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1717 " too large to mount safely\n", sb->s_id);
1718 if (sizeof(sector_t) < 8)
1719 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1720 "enabled\n");
1721 goto failed_mount;
1722 }
1723
1724 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1725 goto cantfind_ext3;
1726 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1727 le32_to_cpu(es->s_first_data_block) - 1)
1728 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1729 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1730 EXT3_DESC_PER_BLOCK(sb);
1731 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1732 GFP_KERNEL);
1733 if (sbi->s_group_desc == NULL) {
1734 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1735 goto failed_mount;
1736 }
1737
1738 bgl_lock_init(&sbi->s_blockgroup_lock);
1739
1740 for (i = 0; i < db_count; i++) {
1741 block = descriptor_loc(sb, logic_sb_block, i);
1742 sbi->s_group_desc[i] = sb_bread(sb, block);
1743 if (!sbi->s_group_desc[i]) {
1744 printk (KERN_ERR "EXT3-fs: "
1745 "can't read group descriptor %d\n", i);
1746 db_count = i;
1747 goto failed_mount2;
1748 }
1749 }
1750 if (!ext3_check_descriptors (sb)) {
1751 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1752 goto failed_mount2;
1753 }
1754 sbi->s_gdb_count = db_count;
1755 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1756 spin_lock_init(&sbi->s_next_gen_lock);
1757
1758 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1759 ext3_count_free_blocks(sb));
1760 if (!err) {
1761 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1762 ext3_count_free_inodes(sb));
1763 }
1764 if (!err) {
1765 err = percpu_counter_init(&sbi->s_dirs_counter,
1766 ext3_count_dirs(sb));
1767 }
1768 if (err) {
1769 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1770 goto failed_mount3;
1771 }
1772
1773 /* per fileystem reservation list head & lock */
1774 spin_lock_init(&sbi->s_rsv_window_lock);
1775 sbi->s_rsv_window_root = RB_ROOT;
1776 /* Add a single, static dummy reservation to the start of the
1777 * reservation window list --- it gives us a placeholder for
1778 * append-at-start-of-list which makes the allocation logic
1779 * _much_ simpler. */
1780 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1781 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1782 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1783 sbi->s_rsv_window_head.rsv_goal_size = 0;
1784 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1785
1786 /*
1787 * set up enough so that it can read an inode
1788 */
1789 sb->s_op = &ext3_sops;
1790 sb->s_export_op = &ext3_export_ops;
1791 sb->s_xattr = ext3_xattr_handlers;
1792 #ifdef CONFIG_QUOTA
1793 sb->s_qcop = &ext3_qctl_operations;
1794 sb->dq_op = &ext3_quota_operations;
1795 #endif
1796 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1797
1798 sb->s_root = NULL;
1799
1800 needs_recovery = (es->s_last_orphan != 0 ||
1801 EXT3_HAS_INCOMPAT_FEATURE(sb,
1802 EXT3_FEATURE_INCOMPAT_RECOVER));
1803
1804 /*
1805 * The first inode we look at is the journal inode. Don't try
1806 * root first: it may be modified in the journal!
1807 */
1808 if (!test_opt(sb, NOLOAD) &&
1809 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1810 if (ext3_load_journal(sb, es, journal_devnum))
1811 goto failed_mount3;
1812 } else if (journal_inum) {
1813 if (ext3_create_journal(sb, es, journal_inum))
1814 goto failed_mount3;
1815 } else {
1816 if (!silent)
1817 printk (KERN_ERR
1818 "ext3: No journal on filesystem on %s\n",
1819 sb->s_id);
1820 goto failed_mount3;
1821 }
1822
1823 /* We have now updated the journal if required, so we can
1824 * validate the data journaling mode. */
1825 switch (test_opt(sb, DATA_FLAGS)) {
1826 case 0:
1827 /* No mode set, assume a default based on the journal
1828 capabilities: ORDERED_DATA if the journal can
1829 cope, else JOURNAL_DATA */
1830 if (journal_check_available_features
1831 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1832 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1833 else
1834 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1835 break;
1836
1837 case EXT3_MOUNT_ORDERED_DATA:
1838 case EXT3_MOUNT_WRITEBACK_DATA:
1839 if (!journal_check_available_features
1840 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1841 printk(KERN_ERR "EXT3-fs: Journal does not support "
1842 "requested data journaling mode\n");
1843 goto failed_mount4;
1844 }
1845 default:
1846 break;
1847 }
1848
1849 if (test_opt(sb, NOBH)) {
1850 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1851 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1852 "its supported only with writeback mode\n");
1853 clear_opt(sbi->s_mount_opt, NOBH);
1854 }
1855 }
1856 /*
1857 * The journal_load will have done any necessary log recovery,
1858 * so we can safely mount the rest of the filesystem now.
1859 */
1860
1861 root = iget(sb, EXT3_ROOT_INO);
1862 sb->s_root = d_alloc_root(root);
1863 if (!sb->s_root) {
1864 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1865 iput(root);
1866 goto failed_mount4;
1867 }
1868 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1869 dput(sb->s_root);
1870 sb->s_root = NULL;
1871 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1872 goto failed_mount4;
1873 }
1874
1875 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1876 /*
1877 * akpm: core read_super() calls in here with the superblock locked.
1878 * That deadlocks, because orphan cleanup needs to lock the superblock
1879 * in numerous places. Here we just pop the lock - it's relatively
1880 * harmless, because we are now ready to accept write_super() requests,
1881 * and aviro says that's the only reason for hanging onto the
1882 * superblock lock.
1883 */
1884 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1885 ext3_orphan_cleanup(sb, es);
1886 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1887 if (needs_recovery)
1888 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1889 ext3_mark_recovery_complete(sb, es);
1890 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1891 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1892 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1893 "writeback");
1894
1895 lock_kernel();
1896 return 0;
1897
1898 cantfind_ext3:
1899 if (!silent)
1900 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1901 sb->s_id);
1902 goto failed_mount;
1903
1904 failed_mount4:
1905 journal_destroy(sbi->s_journal);
1906 failed_mount3:
1907 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1908 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1909 percpu_counter_destroy(&sbi->s_dirs_counter);
1910 failed_mount2:
1911 for (i = 0; i < db_count; i++)
1912 brelse(sbi->s_group_desc[i]);
1913 kfree(sbi->s_group_desc);
1914 failed_mount:
1915 #ifdef CONFIG_QUOTA
1916 for (i = 0; i < MAXQUOTAS; i++)
1917 kfree(sbi->s_qf_names[i]);
1918 #endif
1919 ext3_blkdev_remove(sbi);
1920 brelse(bh);
1921 out_fail:
1922 sb->s_fs_info = NULL;
1923 kfree(sbi);
1924 lock_kernel();
1925 return -EINVAL;
1926 }
1927
1928 /*
1929 * Setup any per-fs journal parameters now. We'll do this both on
1930 * initial mount, once the journal has been initialised but before we've
1931 * done any recovery; and again on any subsequent remount.
1932 */
1933 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1934 {
1935 struct ext3_sb_info *sbi = EXT3_SB(sb);
1936
1937 if (sbi->s_commit_interval)
1938 journal->j_commit_interval = sbi->s_commit_interval;
1939 /* We could also set up an ext3-specific default for the commit
1940 * interval here, but for now we'll just fall back to the jbd
1941 * default. */
1942
1943 spin_lock(&journal->j_state_lock);
1944 if (test_opt(sb, BARRIER))
1945 journal->j_flags |= JFS_BARRIER;
1946 else
1947 journal->j_flags &= ~JFS_BARRIER;
1948 spin_unlock(&journal->j_state_lock);
1949 }
1950
1951 static journal_t *ext3_get_journal(struct super_block *sb,
1952 unsigned int journal_inum)
1953 {
1954 struct inode *journal_inode;
1955 journal_t *journal;
1956
1957 /* First, test for the existence of a valid inode on disk. Bad
1958 * things happen if we iget() an unused inode, as the subsequent
1959 * iput() will try to delete it. */
1960
1961 journal_inode = iget(sb, journal_inum);
1962 if (!journal_inode) {
1963 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1964 return NULL;
1965 }
1966 if (!journal_inode->i_nlink) {
1967 make_bad_inode(journal_inode);
1968 iput(journal_inode);
1969 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1970 return NULL;
1971 }
1972
1973 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1974 journal_inode, journal_inode->i_size);
1975 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1976 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1977 iput(journal_inode);
1978 return NULL;
1979 }
1980
1981 journal = journal_init_inode(journal_inode);
1982 if (!journal) {
1983 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1984 iput(journal_inode);
1985 return NULL;
1986 }
1987 journal->j_private = sb;
1988 ext3_init_journal_params(sb, journal);
1989 return journal;
1990 }
1991
1992 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1993 dev_t j_dev)
1994 {
1995 struct buffer_head * bh;
1996 journal_t *journal;
1997 ext3_fsblk_t start;
1998 ext3_fsblk_t len;
1999 int hblock, blocksize;
2000 ext3_fsblk_t sb_block;
2001 unsigned long offset;
2002 struct ext3_super_block * es;
2003 struct block_device *bdev;
2004
2005 bdev = ext3_blkdev_get(j_dev);
2006 if (bdev == NULL)
2007 return NULL;
2008
2009 if (bd_claim(bdev, sb)) {
2010 printk(KERN_ERR
2011 "EXT3: failed to claim external journal device.\n");
2012 blkdev_put(bdev);
2013 return NULL;
2014 }
2015
2016 blocksize = sb->s_blocksize;
2017 hblock = bdev_hardsect_size(bdev);
2018 if (blocksize < hblock) {
2019 printk(KERN_ERR
2020 "EXT3-fs: blocksize too small for journal device.\n");
2021 goto out_bdev;
2022 }
2023
2024 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2025 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2026 set_blocksize(bdev, blocksize);
2027 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2028 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2029 "external journal\n");
2030 goto out_bdev;
2031 }
2032
2033 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2034 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2035 !(le32_to_cpu(es->s_feature_incompat) &
2036 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2037 printk(KERN_ERR "EXT3-fs: external journal has "
2038 "bad superblock\n");
2039 brelse(bh);
2040 goto out_bdev;
2041 }
2042
2043 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2044 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2045 brelse(bh);
2046 goto out_bdev;
2047 }
2048
2049 len = le32_to_cpu(es->s_blocks_count);
2050 start = sb_block + 1;
2051 brelse(bh); /* we're done with the superblock */
2052
2053 journal = journal_init_dev(bdev, sb->s_bdev,
2054 start, len, blocksize);
2055 if (!journal) {
2056 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2057 goto out_bdev;
2058 }
2059 journal->j_private = sb;
2060 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2061 wait_on_buffer(journal->j_sb_buffer);
2062 if (!buffer_uptodate(journal->j_sb_buffer)) {
2063 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2064 goto out_journal;
2065 }
2066 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2067 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2068 "user (unsupported) - %d\n",
2069 be32_to_cpu(journal->j_superblock->s_nr_users));
2070 goto out_journal;
2071 }
2072 EXT3_SB(sb)->journal_bdev = bdev;
2073 ext3_init_journal_params(sb, journal);
2074 return journal;
2075 out_journal:
2076 journal_destroy(journal);
2077 out_bdev:
2078 ext3_blkdev_put(bdev);
2079 return NULL;
2080 }
2081
2082 static int ext3_load_journal(struct super_block *sb,
2083 struct ext3_super_block *es,
2084 unsigned long journal_devnum)
2085 {
2086 journal_t *journal;
2087 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2088 dev_t journal_dev;
2089 int err = 0;
2090 int really_read_only;
2091
2092 if (journal_devnum &&
2093 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2094 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2095 "numbers have changed\n");
2096 journal_dev = new_decode_dev(journal_devnum);
2097 } else
2098 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2099
2100 really_read_only = bdev_read_only(sb->s_bdev);
2101
2102 /*
2103 * Are we loading a blank journal or performing recovery after a
2104 * crash? For recovery, we need to check in advance whether we
2105 * can get read-write access to the device.
2106 */
2107
2108 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2109 if (sb->s_flags & MS_RDONLY) {
2110 printk(KERN_INFO "EXT3-fs: INFO: recovery "
2111 "required on readonly filesystem.\n");
2112 if (really_read_only) {
2113 printk(KERN_ERR "EXT3-fs: write access "
2114 "unavailable, cannot proceed.\n");
2115 return -EROFS;
2116 }
2117 printk (KERN_INFO "EXT3-fs: write access will "
2118 "be enabled during recovery.\n");
2119 }
2120 }
2121
2122 if (journal_inum && journal_dev) {
2123 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2124 "and inode journals!\n");
2125 return -EINVAL;
2126 }
2127
2128 if (journal_inum) {
2129 if (!(journal = ext3_get_journal(sb, journal_inum)))
2130 return -EINVAL;
2131 } else {
2132 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2133 return -EINVAL;
2134 }
2135
2136 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2137 err = journal_update_format(journal);
2138 if (err) {
2139 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2140 journal_destroy(journal);
2141 return err;
2142 }
2143 }
2144
2145 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2146 err = journal_wipe(journal, !really_read_only);
2147 if (!err)
2148 err = journal_load(journal);
2149
2150 if (err) {
2151 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2152 journal_destroy(journal);
2153 return err;
2154 }
2155
2156 EXT3_SB(sb)->s_journal = journal;
2157 ext3_clear_journal_err(sb, es);
2158
2159 if (journal_devnum &&
2160 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2161 es->s_journal_dev = cpu_to_le32(journal_devnum);
2162 sb->s_dirt = 1;
2163
2164 /* Make sure we flush the recovery flag to disk. */
2165 ext3_commit_super(sb, es, 1);
2166 }
2167
2168 return 0;
2169 }
2170
2171 static int ext3_create_journal(struct super_block * sb,
2172 struct ext3_super_block * es,
2173 unsigned int journal_inum)
2174 {
2175 journal_t *journal;
2176 int err;
2177
2178 if (sb->s_flags & MS_RDONLY) {
2179 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2180 "create journal.\n");
2181 return -EROFS;
2182 }
2183
2184 journal = ext3_get_journal(sb, journal_inum);
2185 if (!journal)
2186 return -EINVAL;
2187
2188 printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2189 journal_inum);
2190
2191 err = journal_create(journal);
2192 if (err) {
2193 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2194 journal_destroy(journal);
2195 return -EIO;
2196 }
2197
2198 EXT3_SB(sb)->s_journal = journal;
2199
2200 ext3_update_dynamic_rev(sb);
2201 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2202 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2203
2204 es->s_journal_inum = cpu_to_le32(journal_inum);
2205 sb->s_dirt = 1;
2206
2207 /* Make sure we flush the recovery flag to disk. */
2208 ext3_commit_super(sb, es, 1);
2209
2210 return 0;
2211 }
2212
2213 static void ext3_commit_super (struct super_block * sb,
2214 struct ext3_super_block * es,
2215 int sync)
2216 {
2217 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2218
2219 if (!sbh)
2220 return;
2221 es->s_wtime = cpu_to_le32(get_seconds());
2222 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2223 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2224 BUFFER_TRACE(sbh, "marking dirty");
2225 mark_buffer_dirty(sbh);
2226 if (sync)
2227 sync_dirty_buffer(sbh);
2228 }
2229
2230
2231 /*
2232 * Have we just finished recovery? If so, and if we are mounting (or
2233 * remounting) the filesystem readonly, then we will end up with a
2234 * consistent fs on disk. Record that fact.
2235 */
2236 static void ext3_mark_recovery_complete(struct super_block * sb,
2237 struct ext3_super_block * es)
2238 {
2239 journal_t *journal = EXT3_SB(sb)->s_journal;
2240
2241 journal_lock_updates(journal);
2242 journal_flush(journal);
2243 lock_super(sb);
2244 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2245 sb->s_flags & MS_RDONLY) {
2246 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2247 sb->s_dirt = 0;
2248 ext3_commit_super(sb, es, 1);
2249 }
2250 unlock_super(sb);
2251 journal_unlock_updates(journal);
2252 }
2253
2254 /*
2255 * If we are mounting (or read-write remounting) a filesystem whose journal
2256 * has recorded an error from a previous lifetime, move that error to the
2257 * main filesystem now.
2258 */
2259 static void ext3_clear_journal_err(struct super_block * sb,
2260 struct ext3_super_block * es)
2261 {
2262 journal_t *journal;
2263 int j_errno;
2264 const char *errstr;
2265
2266 journal = EXT3_SB(sb)->s_journal;
2267
2268 /*
2269 * Now check for any error status which may have been recorded in the
2270 * journal by a prior ext3_error() or ext3_abort()
2271 */
2272
2273 j_errno = journal_errno(journal);
2274 if (j_errno) {
2275 char nbuf[16];
2276
2277 errstr = ext3_decode_error(sb, j_errno, nbuf);
2278 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2279 "from previous mount: %s", errstr);
2280 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2281 "filesystem check.");
2282
2283 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2284 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2285 ext3_commit_super (sb, es, 1);
2286
2287 journal_clear_err(journal);
2288 }
2289 }
2290
2291 /*
2292 * Force the running and committing transactions to commit,
2293 * and wait on the commit.
2294 */
2295 int ext3_force_commit(struct super_block *sb)
2296 {
2297 journal_t *journal;
2298 int ret;
2299
2300 if (sb->s_flags & MS_RDONLY)
2301 return 0;
2302
2303 journal = EXT3_SB(sb)->s_journal;
2304 sb->s_dirt = 0;
2305 ret = ext3_journal_force_commit(journal);
2306 return ret;
2307 }
2308
2309 /*
2310 * Ext3 always journals updates to the superblock itself, so we don't
2311 * have to propagate any other updates to the superblock on disk at this
2312 * point. Just start an async writeback to get the buffers on their way
2313 * to the disk.
2314 *
2315 * This implicitly triggers the writebehind on sync().
2316 */
2317
2318 static void ext3_write_super (struct super_block * sb)
2319 {
2320 if (mutex_trylock(&sb->s_lock) != 0)
2321 BUG();
2322 sb->s_dirt = 0;
2323 }
2324
2325 static int ext3_sync_fs(struct super_block *sb, int wait)
2326 {
2327 tid_t target;
2328
2329 sb->s_dirt = 0;
2330 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2331 if (wait)
2332 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2333 }
2334 return 0;
2335 }
2336
2337 /*
2338 * LVM calls this function before a (read-only) snapshot is created. This
2339 * gives us a chance to flush the journal completely and mark the fs clean.
2340 */
2341 static void ext3_write_super_lockfs(struct super_block *sb)
2342 {
2343 sb->s_dirt = 0;
2344
2345 if (!(sb->s_flags & MS_RDONLY)) {
2346 journal_t *journal = EXT3_SB(sb)->s_journal;
2347
2348 /* Now we set up the journal barrier. */
2349 journal_lock_updates(journal);
2350 journal_flush(journal);
2351
2352 /* Journal blocked and flushed, clear needs_recovery flag. */
2353 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2354 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2355 }
2356 }
2357
2358 /*
2359 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2360 * flag here, even though the filesystem is not technically dirty yet.
2361 */
2362 static void ext3_unlockfs(struct super_block *sb)
2363 {
2364 if (!(sb->s_flags & MS_RDONLY)) {
2365 lock_super(sb);
2366 /* Reser the needs_recovery flag before the fs is unlocked. */
2367 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2368 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2369 unlock_super(sb);
2370 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2371 }
2372 }
2373
2374 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2375 {
2376 struct ext3_super_block * es;
2377 struct ext3_sb_info *sbi = EXT3_SB(sb);
2378 ext3_fsblk_t n_blocks_count = 0;
2379 unsigned long old_sb_flags;
2380 struct ext3_mount_options old_opts;
2381 int err;
2382 #ifdef CONFIG_QUOTA
2383 int i;
2384 #endif
2385
2386 /* Store the original options */
2387 old_sb_flags = sb->s_flags;
2388 old_opts.s_mount_opt = sbi->s_mount_opt;
2389 old_opts.s_resuid = sbi->s_resuid;
2390 old_opts.s_resgid = sbi->s_resgid;
2391 old_opts.s_commit_interval = sbi->s_commit_interval;
2392 #ifdef CONFIG_QUOTA
2393 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2394 for (i = 0; i < MAXQUOTAS; i++)
2395 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2396 #endif
2397
2398 /*
2399 * Allow the "check" option to be passed as a remount option.
2400 */
2401 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2402 err = -EINVAL;
2403 goto restore_opts;
2404 }
2405
2406 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2407 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2408
2409 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2410 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2411
2412 es = sbi->s_es;
2413
2414 ext3_init_journal_params(sb, sbi->s_journal);
2415
2416 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2417 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2418 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2419 err = -EROFS;
2420 goto restore_opts;
2421 }
2422
2423 if (*flags & MS_RDONLY) {
2424 /*
2425 * First of all, the unconditional stuff we have to do
2426 * to disable replay of the journal when we next remount
2427 */
2428 sb->s_flags |= MS_RDONLY;
2429
2430 /*
2431 * OK, test if we are remounting a valid rw partition
2432 * readonly, and if so set the rdonly flag and then
2433 * mark the partition as valid again.
2434 */
2435 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2436 (sbi->s_mount_state & EXT3_VALID_FS))
2437 es->s_state = cpu_to_le16(sbi->s_mount_state);
2438
2439 /*
2440 * We have to unlock super so that we can wait for
2441 * transactions.
2442 */
2443 unlock_super(sb);
2444 ext3_mark_recovery_complete(sb, es);
2445 lock_super(sb);
2446 } else {
2447 __le32 ret;
2448 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2449 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2450 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2451 "remount RDWR because of unsupported "
2452 "optional features (%x).\n",
2453 sb->s_id, le32_to_cpu(ret));
2454 err = -EROFS;
2455 goto restore_opts;
2456 }
2457
2458 /*
2459 * If we have an unprocessed orphan list hanging
2460 * around from a previously readonly bdev mount,
2461 * require a full umount/remount for now.
2462 */
2463 if (es->s_last_orphan) {
2464 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2465 "remount RDWR because of unprocessed "
2466 "orphan inode list. Please "
2467 "umount/remount instead.\n",
2468 sb->s_id);
2469 err = -EINVAL;
2470 goto restore_opts;
2471 }
2472
2473 /*
2474 * Mounting a RDONLY partition read-write, so reread
2475 * and store the current valid flag. (It may have
2476 * been changed by e2fsck since we originally mounted
2477 * the partition.)
2478 */
2479 ext3_clear_journal_err(sb, es);
2480 sbi->s_mount_state = le16_to_cpu(es->s_state);
2481 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2482 goto restore_opts;
2483 if (!ext3_setup_super (sb, es, 0))
2484 sb->s_flags &= ~MS_RDONLY;
2485 }
2486 }
2487 #ifdef CONFIG_QUOTA
2488 /* Release old quota file names */
2489 for (i = 0; i < MAXQUOTAS; i++)
2490 if (old_opts.s_qf_names[i] &&
2491 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2492 kfree(old_opts.s_qf_names[i]);
2493 #endif
2494 return 0;
2495 restore_opts:
2496 sb->s_flags = old_sb_flags;
2497 sbi->s_mount_opt = old_opts.s_mount_opt;
2498 sbi->s_resuid = old_opts.s_resuid;
2499 sbi->s_resgid = old_opts.s_resgid;
2500 sbi->s_commit_interval = old_opts.s_commit_interval;
2501 #ifdef CONFIG_QUOTA
2502 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2503 for (i = 0; i < MAXQUOTAS; i++) {
2504 if (sbi->s_qf_names[i] &&
2505 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2506 kfree(sbi->s_qf_names[i]);
2507 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2508 }
2509 #endif
2510 return err;
2511 }
2512
2513 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2514 {
2515 struct super_block *sb = dentry->d_sb;
2516 struct ext3_sb_info *sbi = EXT3_SB(sb);
2517 struct ext3_super_block *es = sbi->s_es;
2518 u64 fsid;
2519
2520 if (test_opt(sb, MINIX_DF)) {
2521 sbi->s_overhead_last = 0;
2522 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2523 unsigned long ngroups = sbi->s_groups_count, i;
2524 ext3_fsblk_t overhead = 0;
2525 smp_rmb();
2526
2527 /*
2528 * Compute the overhead (FS structures). This is constant
2529 * for a given filesystem unless the number of block groups
2530 * changes so we cache the previous value until it does.
2531 */
2532
2533 /*
2534 * All of the blocks before first_data_block are
2535 * overhead
2536 */
2537 overhead = le32_to_cpu(es->s_first_data_block);
2538
2539 /*
2540 * Add the overhead attributed to the superblock and
2541 * block group descriptors. If the sparse superblocks
2542 * feature is turned on, then not all groups have this.
2543 */
2544 for (i = 0; i < ngroups; i++) {
2545 overhead += ext3_bg_has_super(sb, i) +
2546 ext3_bg_num_gdb(sb, i);
2547 cond_resched();
2548 }
2549
2550 /*
2551 * Every block group has an inode bitmap, a block
2552 * bitmap, and an inode table.
2553 */
2554 overhead += ngroups * (2 + sbi->s_itb_per_group);
2555 sbi->s_overhead_last = overhead;
2556 smp_wmb();
2557 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2558 }
2559
2560 buf->f_type = EXT3_SUPER_MAGIC;
2561 buf->f_bsize = sb->s_blocksize;
2562 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2563 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2564 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2565 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2566 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2567 buf->f_bavail = 0;
2568 buf->f_files = le32_to_cpu(es->s_inodes_count);
2569 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2570 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2571 buf->f_namelen = EXT3_NAME_LEN;
2572 fsid = le64_to_cpup((void *)es->s_uuid) ^
2573 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2574 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2575 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2576 return 0;
2577 }
2578
2579 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2580 * is locked for write. Otherwise the are possible deadlocks:
2581 * Process 1 Process 2
2582 * ext3_create() quota_sync()
2583 * journal_start() write_dquot()
2584 * DQUOT_INIT() down(dqio_mutex)
2585 * down(dqio_mutex) journal_start()
2586 *
2587 */
2588
2589 #ifdef CONFIG_QUOTA
2590
2591 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2592 {
2593 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2594 }
2595
2596 static int ext3_dquot_initialize(struct inode *inode, int type)
2597 {
2598 handle_t *handle;
2599 int ret, err;
2600
2601 /* We may create quota structure so we need to reserve enough blocks */
2602 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2603 if (IS_ERR(handle))
2604 return PTR_ERR(handle);
2605 ret = dquot_initialize(inode, type);
2606 err = ext3_journal_stop(handle);
2607 if (!ret)
2608 ret = err;
2609 return ret;
2610 }
2611
2612 static int ext3_dquot_drop(struct inode *inode)
2613 {
2614 handle_t *handle;
2615 int ret, err;
2616
2617 /* We may delete quota structure so we need to reserve enough blocks */
2618 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2619 if (IS_ERR(handle))
2620 return PTR_ERR(handle);
2621 ret = dquot_drop(inode);
2622 err = ext3_journal_stop(handle);
2623 if (!ret)
2624 ret = err;
2625 return ret;
2626 }
2627
2628 static int ext3_write_dquot(struct dquot *dquot)
2629 {
2630 int ret, err;
2631 handle_t *handle;
2632 struct inode *inode;
2633
2634 inode = dquot_to_inode(dquot);
2635 handle = ext3_journal_start(inode,
2636 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2637 if (IS_ERR(handle))
2638 return PTR_ERR(handle);
2639 ret = dquot_commit(dquot);
2640 err = ext3_journal_stop(handle);
2641 if (!ret)
2642 ret = err;
2643 return ret;
2644 }
2645
2646 static int ext3_acquire_dquot(struct dquot *dquot)
2647 {
2648 int ret, err;
2649 handle_t *handle;
2650
2651 handle = ext3_journal_start(dquot_to_inode(dquot),
2652 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2653 if (IS_ERR(handle))
2654 return PTR_ERR(handle);
2655 ret = dquot_acquire(dquot);
2656 err = ext3_journal_stop(handle);
2657 if (!ret)
2658 ret = err;
2659 return ret;
2660 }
2661
2662 static int ext3_release_dquot(struct dquot *dquot)
2663 {
2664 int ret, err;
2665 handle_t *handle;
2666
2667 handle = ext3_journal_start(dquot_to_inode(dquot),
2668 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2669 if (IS_ERR(handle)) {
2670 /* Release dquot anyway to avoid endless cycle in dqput() */
2671 dquot_release(dquot);
2672 return PTR_ERR(handle);
2673 }
2674 ret = dquot_release(dquot);
2675 err = ext3_journal_stop(handle);
2676 if (!ret)
2677 ret = err;
2678 return ret;
2679 }
2680
2681 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2682 {
2683 /* Are we journalling quotas? */
2684 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2685 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2686 dquot_mark_dquot_dirty(dquot);
2687 return ext3_write_dquot(dquot);
2688 } else {
2689 return dquot_mark_dquot_dirty(dquot);
2690 }
2691 }
2692
2693 static int ext3_write_info(struct super_block *sb, int type)
2694 {
2695 int ret, err;
2696 handle_t *handle;
2697
2698 /* Data block + inode block */
2699 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2700 if (IS_ERR(handle))
2701 return PTR_ERR(handle);
2702 ret = dquot_commit_info(sb, type);
2703 err = ext3_journal_stop(handle);
2704 if (!ret)
2705 ret = err;
2706 return ret;
2707 }
2708
2709 /*
2710 * Turn on quotas during mount time - we need to find
2711 * the quota file and such...
2712 */
2713 static int ext3_quota_on_mount(struct super_block *sb, int type)
2714 {
2715 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2716 EXT3_SB(sb)->s_jquota_fmt, type);
2717 }
2718
2719 /*
2720 * Standard function to be called on quota_on
2721 */
2722 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2723 char *path)
2724 {
2725 int err;
2726 struct nameidata nd;
2727
2728 if (!test_opt(sb, QUOTA))
2729 return -EINVAL;
2730 /* Not journalling quota? */
2731 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2732 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2733 return vfs_quota_on(sb, type, format_id, path);
2734 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2735 if (err)
2736 return err;
2737 /* Quotafile not on the same filesystem? */
2738 if (nd.mnt->mnt_sb != sb) {
2739 path_release(&nd);
2740 return -EXDEV;
2741 }
2742 /* Quotafile not of fs root? */
2743 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2744 printk(KERN_WARNING
2745 "EXT3-fs: Quota file not on filesystem root. "
2746 "Journalled quota will not work.\n");
2747 path_release(&nd);
2748 return vfs_quota_on(sb, type, format_id, path);
2749 }
2750
2751 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2752 * acquiring the locks... As quota files are never truncated and quota code
2753 * itself serializes the operations (and noone else should touch the files)
2754 * we don't have to be afraid of races */
2755 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2756 size_t len, loff_t off)
2757 {
2758 struct inode *inode = sb_dqopt(sb)->files[type];
2759 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2760 int err = 0;
2761 int offset = off & (sb->s_blocksize - 1);
2762 int tocopy;
2763 size_t toread;
2764 struct buffer_head *bh;
2765 loff_t i_size = i_size_read(inode);
2766
2767 if (off > i_size)
2768 return 0;
2769 if (off+len > i_size)
2770 len = i_size-off;
2771 toread = len;
2772 while (toread > 0) {
2773 tocopy = sb->s_blocksize - offset < toread ?
2774 sb->s_blocksize - offset : toread;
2775 bh = ext3_bread(NULL, inode, blk, 0, &err);
2776 if (err)
2777 return err;
2778 if (!bh) /* A hole? */
2779 memset(data, 0, tocopy);
2780 else
2781 memcpy(data, bh->b_data+offset, tocopy);
2782 brelse(bh);
2783 offset = 0;
2784 toread -= tocopy;
2785 data += tocopy;
2786 blk++;
2787 }
2788 return len;
2789 }
2790
2791 /* Write to quotafile (we know the transaction is already started and has
2792 * enough credits) */
2793 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2794 const char *data, size_t len, loff_t off)
2795 {
2796 struct inode *inode = sb_dqopt(sb)->files[type];
2797 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2798 int err = 0;
2799 int offset = off & (sb->s_blocksize - 1);
2800 int tocopy;
2801 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2802 size_t towrite = len;
2803 struct buffer_head *bh;
2804 handle_t *handle = journal_current_handle();
2805
2806 if (!handle) {
2807 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2808 " cancelled because transaction is not started.\n",
2809 (unsigned long long)off, (unsigned long long)len);
2810 return -EIO;
2811 }
2812 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2813 while (towrite > 0) {
2814 tocopy = sb->s_blocksize - offset < towrite ?
2815 sb->s_blocksize - offset : towrite;
2816 bh = ext3_bread(handle, inode, blk, 1, &err);
2817 if (!bh)
2818 goto out;
2819 if (journal_quota) {
2820 err = ext3_journal_get_write_access(handle, bh);
2821 if (err) {
2822 brelse(bh);
2823 goto out;
2824 }
2825 }
2826 lock_buffer(bh);
2827 memcpy(bh->b_data+offset, data, tocopy);
2828 flush_dcache_page(bh->b_page);
2829 unlock_buffer(bh);
2830 if (journal_quota)
2831 err = ext3_journal_dirty_metadata(handle, bh);
2832 else {
2833 /* Always do at least ordered writes for quotas */
2834 err = ext3_journal_dirty_data(handle, bh);
2835 mark_buffer_dirty(bh);
2836 }
2837 brelse(bh);
2838 if (err)
2839 goto out;
2840 offset = 0;
2841 towrite -= tocopy;
2842 data += tocopy;
2843 blk++;
2844 }
2845 out:
2846 if (len == towrite)
2847 return err;
2848 if (inode->i_size < off+len-towrite) {
2849 i_size_write(inode, off+len-towrite);
2850 EXT3_I(inode)->i_disksize = inode->i_size;
2851 }
2852 inode->i_version++;
2853 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2854 ext3_mark_inode_dirty(handle, inode);
2855 mutex_unlock(&inode->i_mutex);
2856 return len - towrite;
2857 }
2858
2859 #endif
2860
2861 static int ext3_get_sb(struct file_system_type *fs_type,
2862 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2863 {
2864 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2865 }
2866
2867 static struct file_system_type ext3_fs_type = {
2868 .owner = THIS_MODULE,
2869 .name = "ext3",
2870 .get_sb = ext3_get_sb,
2871 .kill_sb = kill_block_super,
2872 .fs_flags = FS_REQUIRES_DEV,
2873 };
2874
2875 static int __init init_ext3_fs(void)
2876 {
2877 int err = init_ext3_xattr();
2878 if (err)
2879 return err;
2880 err = init_inodecache();
2881 if (err)
2882 goto out1;
2883 err = register_filesystem(&ext3_fs_type);
2884 if (err)
2885 goto out;
2886 return 0;
2887 out:
2888 destroy_inodecache();
2889 out1:
2890 exit_ext3_xattr();
2891 return err;
2892 }
2893
2894 static void __exit exit_ext3_fs(void)
2895 {
2896 unregister_filesystem(&ext3_fs_type);
2897 destroy_inodecache();
2898 exit_ext3_xattr();
2899 }
2900
2901 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2902 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2903 MODULE_LICENSE("GPL");
2904 module_init(init_ext3_fs)
2905 module_exit(exit_ext3_fs)
Stable & featurefull patchset based on Linus's git branch