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BKL: Explicitly add BKL around get_sb/fill_super
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext3 / super.c
blob41f9dcd73e9734d9caac2506e5486db2ca648b0e
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 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
48 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
49 #else
50 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
51 #endif
52
53 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
54 unsigned long journal_devnum);
55 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
56 unsigned int);
57 static int ext3_commit_super(struct super_block *sb,
58 struct ext3_super_block *es,
59 int sync);
60 static void ext3_mark_recovery_complete(struct super_block * sb,
61 struct ext3_super_block * es);
62 static void ext3_clear_journal_err(struct super_block * sb,
63 struct ext3_super_block * es);
64 static int ext3_sync_fs(struct super_block *sb, int wait);
65 static const char *ext3_decode_error(struct super_block * sb, int errno,
66 char nbuf[16]);
67 static int ext3_remount (struct super_block * sb, int * flags, char * data);
68 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
69 static int ext3_unfreeze(struct super_block *sb);
70 static int ext3_freeze(struct super_block *sb);
71
72 /*
73 * Wrappers for journal_start/end.
74 *
75 * The only special thing we need to do here is to make sure that all
76 * journal_end calls result in the superblock being marked dirty, so
77 * that sync() will call the filesystem's write_super callback if
78 * appropriate.
79 */
80 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
81 {
82 journal_t *journal;
83
84 if (sb->s_flags & MS_RDONLY)
85 return ERR_PTR(-EROFS);
86
87 /* Special case here: if the journal has aborted behind our
88 * backs (eg. EIO in the commit thread), then we still need to
89 * take the FS itself readonly cleanly. */
90 journal = EXT3_SB(sb)->s_journal;
91 if (is_journal_aborted(journal)) {
92 ext3_abort(sb, __func__,
93 "Detected aborted journal");
94 return ERR_PTR(-EROFS);
95 }
96
97 return journal_start(journal, nblocks);
98 }
99
100 /*
101 * The only special thing we need to do here is to make sure that all
102 * journal_stop calls result in the superblock being marked dirty, so
103 * that sync() will call the filesystem's write_super callback if
104 * appropriate.
105 */
106 int __ext3_journal_stop(const char *where, handle_t *handle)
107 {
108 struct super_block *sb;
109 int err;
110 int rc;
111
112 sb = handle->h_transaction->t_journal->j_private;
113 err = handle->h_err;
114 rc = journal_stop(handle);
115
116 if (!err)
117 err = rc;
118 if (err)
119 __ext3_std_error(sb, where, err);
120 return err;
121 }
122
123 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
124 struct buffer_head *bh, handle_t *handle, int err)
125 {
126 char nbuf[16];
127 const char *errstr = ext3_decode_error(NULL, err, nbuf);
128
129 if (bh)
130 BUFFER_TRACE(bh, "abort");
131
132 if (!handle->h_err)
133 handle->h_err = err;
134
135 if (is_handle_aborted(handle))
136 return;
137
138 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
139 caller, errstr, err_fn);
140
141 journal_abort_handle(handle);
142 }
143
144 void ext3_msg(struct super_block *sb, const char *prefix,
145 const char *fmt, ...)
146 {
147 va_list args;
148
149 va_start(args, fmt);
150 printk("%sEXT3-fs (%s): ", prefix, sb->s_id);
151 vprintk(fmt, args);
152 printk("\n");
153 va_end(args);
154 }
155
156 /* Deal with the reporting of failure conditions on a filesystem such as
157 * inconsistencies detected or read IO failures.
158 *
159 * On ext2, we can store the error state of the filesystem in the
160 * superblock. That is not possible on ext3, because we may have other
161 * write ordering constraints on the superblock which prevent us from
162 * writing it out straight away; and given that the journal is about to
163 * be aborted, we can't rely on the current, or future, transactions to
164 * write out the superblock safely.
165 *
166 * We'll just use the journal_abort() error code to record an error in
167 * the journal instead. On recovery, the journal will complain about
168 * that error until we've noted it down and cleared it.
169 */
170
171 static void ext3_handle_error(struct super_block *sb)
172 {
173 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
174
175 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
176 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
177
178 if (sb->s_flags & MS_RDONLY)
179 return;
180
181 if (!test_opt (sb, ERRORS_CONT)) {
182 journal_t *journal = EXT3_SB(sb)->s_journal;
183
184 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
185 if (journal)
186 journal_abort(journal, -EIO);
187 }
188 if (test_opt (sb, ERRORS_RO)) {
189 ext3_msg(sb, KERN_CRIT,
190 "error: remounting filesystem read-only");
191 sb->s_flags |= MS_RDONLY;
192 }
193 ext3_commit_super(sb, es, 1);
194 if (test_opt(sb, ERRORS_PANIC))
195 panic("EXT3-fs (%s): panic forced after error\n",
196 sb->s_id);
197 }
198
199 void ext3_error (struct super_block * sb, const char * function,
200 const char * fmt, ...)
201 {
202 va_list args;
203
204 va_start(args, fmt);
205 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
206 vprintk(fmt, args);
207 printk("\n");
208 va_end(args);
209
210 ext3_handle_error(sb);
211 }
212
213 static const char *ext3_decode_error(struct super_block * sb, int errno,
214 char nbuf[16])
215 {
216 char *errstr = NULL;
217
218 switch (errno) {
219 case -EIO:
220 errstr = "IO failure";
221 break;
222 case -ENOMEM:
223 errstr = "Out of memory";
224 break;
225 case -EROFS:
226 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
227 errstr = "Journal has aborted";
228 else
229 errstr = "Readonly filesystem";
230 break;
231 default:
232 /* If the caller passed in an extra buffer for unknown
233 * errors, textualise them now. Else we just return
234 * NULL. */
235 if (nbuf) {
236 /* Check for truncated error codes... */
237 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
238 errstr = nbuf;
239 }
240 break;
241 }
242
243 return errstr;
244 }
245
246 /* __ext3_std_error decodes expected errors from journaling functions
247 * automatically and invokes the appropriate error response. */
248
249 void __ext3_std_error (struct super_block * sb, const char * function,
250 int errno)
251 {
252 char nbuf[16];
253 const char *errstr;
254
255 /* Special case: if the error is EROFS, and we're not already
256 * inside a transaction, then there's really no point in logging
257 * an error. */
258 if (errno == -EROFS && journal_current_handle() == NULL &&
259 (sb->s_flags & MS_RDONLY))
260 return;
261
262 errstr = ext3_decode_error(sb, errno, nbuf);
263 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
264
265 ext3_handle_error(sb);
266 }
267
268 /*
269 * ext3_abort is a much stronger failure handler than ext3_error. The
270 * abort function may be used to deal with unrecoverable failures such
271 * as journal IO errors or ENOMEM at a critical moment in log management.
272 *
273 * We unconditionally force the filesystem into an ABORT|READONLY state,
274 * unless the error response on the fs has been set to panic in which
275 * case we take the easy way out and panic immediately.
276 */
277
278 void ext3_abort (struct super_block * sb, const char * function,
279 const char * fmt, ...)
280 {
281 va_list args;
282
283 va_start(args, fmt);
284 printk(KERN_CRIT "EXT3-fs (%s): error: %s: ", sb->s_id, function);
285 vprintk(fmt, args);
286 printk("\n");
287 va_end(args);
288
289 if (test_opt(sb, ERRORS_PANIC))
290 panic("EXT3-fs: panic from previous error\n");
291
292 if (sb->s_flags & MS_RDONLY)
293 return;
294
295 ext3_msg(sb, KERN_CRIT,
296 "error: remounting filesystem read-only");
297 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
298 sb->s_flags |= MS_RDONLY;
299 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
300 if (EXT3_SB(sb)->s_journal)
301 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
302 }
303
304 void ext3_warning (struct super_block * sb, const char * function,
305 const char * fmt, ...)
306 {
307 va_list args;
308
309 va_start(args, fmt);
310 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: ",
311 sb->s_id, function);
312 vprintk(fmt, args);
313 printk("\n");
314 va_end(args);
315 }
316
317 void ext3_update_dynamic_rev(struct super_block *sb)
318 {
319 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
320
321 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
322 return;
323
324 ext3_msg(sb, KERN_WARNING,
325 "warning: updating to rev %d because of "
326 "new feature flag, running e2fsck is recommended",
327 EXT3_DYNAMIC_REV);
328
329 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
330 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
331 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
332 /* leave es->s_feature_*compat flags alone */
333 /* es->s_uuid will be set by e2fsck if empty */
334
335 /*
336 * The rest of the superblock fields should be zero, and if not it
337 * means they are likely already in use, so leave them alone. We
338 * can leave it up to e2fsck to clean up any inconsistencies there.
339 */
340 }
341
342 /*
343 * Open the external journal device
344 */
345 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
346 {
347 struct block_device *bdev;
348 char b[BDEVNAME_SIZE];
349
350 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
351 if (IS_ERR(bdev))
352 goto fail;
353 return bdev;
354
355 fail:
356 ext3_msg(sb, "error: failed to open journal device %s: %ld",
357 __bdevname(dev, b), PTR_ERR(bdev));
358
359 return NULL;
360 }
361
362 /*
363 * Release the journal device
364 */
365 static int ext3_blkdev_put(struct block_device *bdev)
366 {
367 bd_release(bdev);
368 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
369 }
370
371 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
372 {
373 struct block_device *bdev;
374 int ret = -ENODEV;
375
376 bdev = sbi->journal_bdev;
377 if (bdev) {
378 ret = ext3_blkdev_put(bdev);
379 sbi->journal_bdev = NULL;
380 }
381 return ret;
382 }
383
384 static inline struct inode *orphan_list_entry(struct list_head *l)
385 {
386 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
387 }
388
389 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
390 {
391 struct list_head *l;
392
393 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
394 le32_to_cpu(sbi->s_es->s_last_orphan));
395
396 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
397 list_for_each(l, &sbi->s_orphan) {
398 struct inode *inode = orphan_list_entry(l);
399 ext3_msg(sb, KERN_ERR, " "
400 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
401 inode->i_sb->s_id, inode->i_ino, inode,
402 inode->i_mode, inode->i_nlink,
403 NEXT_ORPHAN(inode));
404 }
405 }
406
407 static void ext3_put_super (struct super_block * sb)
408 {
409 struct ext3_sb_info *sbi = EXT3_SB(sb);
410 struct ext3_super_block *es = sbi->s_es;
411 int i, err;
412
413 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
414
415 lock_kernel();
416
417 ext3_xattr_put_super(sb);
418 err = journal_destroy(sbi->s_journal);
419 sbi->s_journal = NULL;
420 if (err < 0)
421 ext3_abort(sb, __func__, "Couldn't clean up the journal");
422
423 if (!(sb->s_flags & MS_RDONLY)) {
424 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
425 es->s_state = cpu_to_le16(sbi->s_mount_state);
426 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
427 mark_buffer_dirty(sbi->s_sbh);
428 ext3_commit_super(sb, es, 1);
429 }
430
431 for (i = 0; i < sbi->s_gdb_count; i++)
432 brelse(sbi->s_group_desc[i]);
433 kfree(sbi->s_group_desc);
434 percpu_counter_destroy(&sbi->s_freeblocks_counter);
435 percpu_counter_destroy(&sbi->s_freeinodes_counter);
436 percpu_counter_destroy(&sbi->s_dirs_counter);
437 brelse(sbi->s_sbh);
438 #ifdef CONFIG_QUOTA
439 for (i = 0; i < MAXQUOTAS; i++)
440 kfree(sbi->s_qf_names[i]);
441 #endif
442
443 /* Debugging code just in case the in-memory inode orphan list
444 * isn't empty. The on-disk one can be non-empty if we've
445 * detected an error and taken the fs readonly, but the
446 * in-memory list had better be clean by this point. */
447 if (!list_empty(&sbi->s_orphan))
448 dump_orphan_list(sb, sbi);
449 J_ASSERT(list_empty(&sbi->s_orphan));
450
451 invalidate_bdev(sb->s_bdev);
452 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
453 /*
454 * Invalidate the journal device's buffers. We don't want them
455 * floating about in memory - the physical journal device may
456 * hotswapped, and it breaks the `ro-after' testing code.
457 */
458 sync_blockdev(sbi->journal_bdev);
459 invalidate_bdev(sbi->journal_bdev);
460 ext3_blkdev_remove(sbi);
461 }
462 sb->s_fs_info = NULL;
463 kfree(sbi->s_blockgroup_lock);
464 kfree(sbi);
465
466 unlock_kernel();
467 }
468
469 static struct kmem_cache *ext3_inode_cachep;
470
471 /*
472 * Called inside transaction, so use GFP_NOFS
473 */
474 static struct inode *ext3_alloc_inode(struct super_block *sb)
475 {
476 struct ext3_inode_info *ei;
477
478 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
479 if (!ei)
480 return NULL;
481 ei->i_block_alloc_info = NULL;
482 ei->vfs_inode.i_version = 1;
483 atomic_set(&ei->i_datasync_tid, 0);
484 atomic_set(&ei->i_sync_tid, 0);
485 return &ei->vfs_inode;
486 }
487
488 static void ext3_destroy_inode(struct inode *inode)
489 {
490 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
491 printk("EXT3 Inode %p: orphan list check failed!\n",
492 EXT3_I(inode));
493 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
494 EXT3_I(inode), sizeof(struct ext3_inode_info),
495 false);
496 dump_stack();
497 }
498 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
499 }
500
501 static void init_once(void *foo)
502 {
503 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
504
505 INIT_LIST_HEAD(&ei->i_orphan);
506 #ifdef CONFIG_EXT3_FS_XATTR
507 init_rwsem(&ei->xattr_sem);
508 #endif
509 mutex_init(&ei->truncate_mutex);
510 inode_init_once(&ei->vfs_inode);
511 }
512
513 static int init_inodecache(void)
514 {
515 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
516 sizeof(struct ext3_inode_info),
517 0, (SLAB_RECLAIM_ACCOUNT|
518 SLAB_MEM_SPREAD),
519 init_once);
520 if (ext3_inode_cachep == NULL)
521 return -ENOMEM;
522 return 0;
523 }
524
525 static void destroy_inodecache(void)
526 {
527 kmem_cache_destroy(ext3_inode_cachep);
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 char *fmtname = "";
537
538 switch (sbi->s_jquota_fmt) {
539 case QFMT_VFS_OLD:
540 fmtname = "vfsold";
541 break;
542 case QFMT_VFS_V0:
543 fmtname = "vfsv0";
544 break;
545 case QFMT_VFS_V1:
546 fmtname = "vfsv1";
547 break;
548 }
549 seq_printf(seq, ",jqfmt=%s", fmtname);
550 }
551
552 if (sbi->s_qf_names[USRQUOTA])
553 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
554
555 if (sbi->s_qf_names[GRPQUOTA])
556 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
557
558 if (test_opt(sb, USRQUOTA))
559 seq_puts(seq, ",usrquota");
560
561 if (test_opt(sb, GRPQUOTA))
562 seq_puts(seq, ",grpquota");
563 #endif
564 }
565
566 static char *data_mode_string(unsigned long mode)
567 {
568 switch (mode) {
569 case EXT3_MOUNT_JOURNAL_DATA:
570 return "journal";
571 case EXT3_MOUNT_ORDERED_DATA:
572 return "ordered";
573 case EXT3_MOUNT_WRITEBACK_DATA:
574 return "writeback";
575 }
576 return "unknown";
577 }
578
579 /*
580 * Show an option if
581 * - it's set to a non-default value OR
582 * - if the per-sb default is different from the global default
583 */
584 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
585 {
586 struct super_block *sb = vfs->mnt_sb;
587 struct ext3_sb_info *sbi = EXT3_SB(sb);
588 struct ext3_super_block *es = sbi->s_es;
589 unsigned long def_mount_opts;
590
591 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
592
593 if (sbi->s_sb_block != 1)
594 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
595 if (test_opt(sb, MINIX_DF))
596 seq_puts(seq, ",minixdf");
597 if (test_opt(sb, GRPID))
598 seq_puts(seq, ",grpid");
599 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
600 seq_puts(seq, ",nogrpid");
601 if (sbi->s_resuid != EXT3_DEF_RESUID ||
602 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
603 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
604 }
605 if (sbi->s_resgid != EXT3_DEF_RESGID ||
606 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
607 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
608 }
609 if (test_opt(sb, ERRORS_RO)) {
610 int def_errors = le16_to_cpu(es->s_errors);
611
612 if (def_errors == EXT3_ERRORS_PANIC ||
613 def_errors == EXT3_ERRORS_CONTINUE) {
614 seq_puts(seq, ",errors=remount-ro");
615 }
616 }
617 if (test_opt(sb, ERRORS_CONT))
618 seq_puts(seq, ",errors=continue");
619 if (test_opt(sb, ERRORS_PANIC))
620 seq_puts(seq, ",errors=panic");
621 if (test_opt(sb, NO_UID32))
622 seq_puts(seq, ",nouid32");
623 if (test_opt(sb, DEBUG))
624 seq_puts(seq, ",debug");
625 if (test_opt(sb, OLDALLOC))
626 seq_puts(seq, ",oldalloc");
627 #ifdef CONFIG_EXT3_FS_XATTR
628 if (test_opt(sb, XATTR_USER))
629 seq_puts(seq, ",user_xattr");
630 if (!test_opt(sb, XATTR_USER) &&
631 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
632 seq_puts(seq, ",nouser_xattr");
633 }
634 #endif
635 #ifdef CONFIG_EXT3_FS_POSIX_ACL
636 if (test_opt(sb, POSIX_ACL))
637 seq_puts(seq, ",acl");
638 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
639 seq_puts(seq, ",noacl");
640 #endif
641 if (!test_opt(sb, RESERVATION))
642 seq_puts(seq, ",noreservation");
643 if (sbi->s_commit_interval) {
644 seq_printf(seq, ",commit=%u",
645 (unsigned) (sbi->s_commit_interval / HZ));
646 }
647
648 /*
649 * Always display barrier state so it's clear what the status is.
650 */
651 seq_puts(seq, ",barrier=");
652 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
653 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
654 if (test_opt(sb, DATA_ERR_ABORT))
655 seq_puts(seq, ",data_err=abort");
656
657 if (test_opt(sb, NOLOAD))
658 seq_puts(seq, ",norecovery");
659
660 ext3_show_quota_options(seq, sb);
661
662 return 0;
663 }
664
665
666 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
667 u64 ino, u32 generation)
668 {
669 struct inode *inode;
670
671 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
672 return ERR_PTR(-ESTALE);
673 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
674 return ERR_PTR(-ESTALE);
675
676 /* iget isn't really right if the inode is currently unallocated!!
677 *
678 * ext3_read_inode will return a bad_inode if the inode had been
679 * deleted, so we should be safe.
680 *
681 * Currently we don't know the generation for parent directory, so
682 * a generation of 0 means "accept any"
683 */
684 inode = ext3_iget(sb, ino);
685 if (IS_ERR(inode))
686 return ERR_CAST(inode);
687 if (generation && inode->i_generation != generation) {
688 iput(inode);
689 return ERR_PTR(-ESTALE);
690 }
691
692 return inode;
693 }
694
695 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
696 int fh_len, int fh_type)
697 {
698 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
699 ext3_nfs_get_inode);
700 }
701
702 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
703 int fh_len, int fh_type)
704 {
705 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
706 ext3_nfs_get_inode);
707 }
708
709 /*
710 * Try to release metadata pages (indirect blocks, directories) which are
711 * mapped via the block device. Since these pages could have journal heads
712 * which would prevent try_to_free_buffers() from freeing them, we must use
713 * jbd layer's try_to_free_buffers() function to release them.
714 */
715 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
716 gfp_t wait)
717 {
718 journal_t *journal = EXT3_SB(sb)->s_journal;
719
720 WARN_ON(PageChecked(page));
721 if (!page_has_buffers(page))
722 return 0;
723 if (journal)
724 return journal_try_to_free_buffers(journal, page,
725 wait & ~__GFP_WAIT);
726 return try_to_free_buffers(page);
727 }
728
729 #ifdef CONFIG_QUOTA
730 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
731 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
732
733 static int ext3_write_dquot(struct dquot *dquot);
734 static int ext3_acquire_dquot(struct dquot *dquot);
735 static int ext3_release_dquot(struct dquot *dquot);
736 static int ext3_mark_dquot_dirty(struct dquot *dquot);
737 static int ext3_write_info(struct super_block *sb, int type);
738 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
739 char *path);
740 static int ext3_quota_on_mount(struct super_block *sb, int type);
741 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
742 size_t len, loff_t off);
743 static ssize_t ext3_quota_write(struct super_block *sb, int type,
744 const char *data, size_t len, loff_t off);
745
746 static const struct dquot_operations ext3_quota_operations = {
747 .write_dquot = ext3_write_dquot,
748 .acquire_dquot = ext3_acquire_dquot,
749 .release_dquot = ext3_release_dquot,
750 .mark_dirty = ext3_mark_dquot_dirty,
751 .write_info = ext3_write_info,
752 .alloc_dquot = dquot_alloc,
753 .destroy_dquot = dquot_destroy,
754 };
755
756 static const struct quotactl_ops ext3_qctl_operations = {
757 .quota_on = ext3_quota_on,
758 .quota_off = dquot_quota_off,
759 .quota_sync = dquot_quota_sync,
760 .get_info = dquot_get_dqinfo,
761 .set_info = dquot_set_dqinfo,
762 .get_dqblk = dquot_get_dqblk,
763 .set_dqblk = dquot_set_dqblk
764 };
765 #endif
766
767 static const struct super_operations ext3_sops = {
768 .alloc_inode = ext3_alloc_inode,
769 .destroy_inode = ext3_destroy_inode,
770 .write_inode = ext3_write_inode,
771 .dirty_inode = ext3_dirty_inode,
772 .evict_inode = ext3_evict_inode,
773 .put_super = ext3_put_super,
774 .sync_fs = ext3_sync_fs,
775 .freeze_fs = ext3_freeze,
776 .unfreeze_fs = ext3_unfreeze,
777 .statfs = ext3_statfs,
778 .remount_fs = ext3_remount,
779 .show_options = ext3_show_options,
780 #ifdef CONFIG_QUOTA
781 .quota_read = ext3_quota_read,
782 .quota_write = ext3_quota_write,
783 #endif
784 .bdev_try_to_free_page = bdev_try_to_free_page,
785 };
786
787 static const struct export_operations ext3_export_ops = {
788 .fh_to_dentry = ext3_fh_to_dentry,
789 .fh_to_parent = ext3_fh_to_parent,
790 .get_parent = ext3_get_parent,
791 };
792
793 enum {
794 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
795 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
796 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
797 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
798 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
799 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
800 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
801 Opt_data_err_abort, Opt_data_err_ignore,
802 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
803 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
804 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
805 Opt_resize, Opt_usrquota, Opt_grpquota
806 };
807
808 static const match_table_t tokens = {
809 {Opt_bsd_df, "bsddf"},
810 {Opt_minix_df, "minixdf"},
811 {Opt_grpid, "grpid"},
812 {Opt_grpid, "bsdgroups"},
813 {Opt_nogrpid, "nogrpid"},
814 {Opt_nogrpid, "sysvgroups"},
815 {Opt_resgid, "resgid=%u"},
816 {Opt_resuid, "resuid=%u"},
817 {Opt_sb, "sb=%u"},
818 {Opt_err_cont, "errors=continue"},
819 {Opt_err_panic, "errors=panic"},
820 {Opt_err_ro, "errors=remount-ro"},
821 {Opt_nouid32, "nouid32"},
822 {Opt_nocheck, "nocheck"},
823 {Opt_nocheck, "check=none"},
824 {Opt_debug, "debug"},
825 {Opt_oldalloc, "oldalloc"},
826 {Opt_orlov, "orlov"},
827 {Opt_user_xattr, "user_xattr"},
828 {Opt_nouser_xattr, "nouser_xattr"},
829 {Opt_acl, "acl"},
830 {Opt_noacl, "noacl"},
831 {Opt_reservation, "reservation"},
832 {Opt_noreservation, "noreservation"},
833 {Opt_noload, "noload"},
834 {Opt_noload, "norecovery"},
835 {Opt_nobh, "nobh"},
836 {Opt_bh, "bh"},
837 {Opt_commit, "commit=%u"},
838 {Opt_journal_update, "journal=update"},
839 {Opt_journal_inum, "journal=%u"},
840 {Opt_journal_dev, "journal_dev=%u"},
841 {Opt_abort, "abort"},
842 {Opt_data_journal, "data=journal"},
843 {Opt_data_ordered, "data=ordered"},
844 {Opt_data_writeback, "data=writeback"},
845 {Opt_data_err_abort, "data_err=abort"},
846 {Opt_data_err_ignore, "data_err=ignore"},
847 {Opt_offusrjquota, "usrjquota="},
848 {Opt_usrjquota, "usrjquota=%s"},
849 {Opt_offgrpjquota, "grpjquota="},
850 {Opt_grpjquota, "grpjquota=%s"},
851 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
852 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
853 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
854 {Opt_grpquota, "grpquota"},
855 {Opt_noquota, "noquota"},
856 {Opt_quota, "quota"},
857 {Opt_usrquota, "usrquota"},
858 {Opt_barrier, "barrier=%u"},
859 {Opt_barrier, "barrier"},
860 {Opt_nobarrier, "nobarrier"},
861 {Opt_resize, "resize"},
862 {Opt_err, NULL},
863 };
864
865 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
866 {
867 ext3_fsblk_t sb_block;
868 char *options = (char *) *data;
869
870 if (!options || strncmp(options, "sb=", 3) != 0)
871 return 1; /* Default location */
872 options += 3;
873 /*todo: use simple_strtoll with >32bit ext3 */
874 sb_block = simple_strtoul(options, &options, 0);
875 if (*options && *options != ',') {
876 ext3_msg(sb, "error: invalid sb specification: %s",
877 (char *) *data);
878 return 1;
879 }
880 if (*options == ',')
881 options++;
882 *data = (void *) options;
883 return sb_block;
884 }
885
886 #ifdef CONFIG_QUOTA
887 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
888 {
889 struct ext3_sb_info *sbi = EXT3_SB(sb);
890 char *qname;
891
892 if (sb_any_quota_loaded(sb) &&
893 !sbi->s_qf_names[qtype]) {
894 ext3_msg(sb, KERN_ERR,
895 "Cannot change journaled "
896 "quota options when quota turned on");
897 return 0;
898 }
899 qname = match_strdup(args);
900 if (!qname) {
901 ext3_msg(sb, KERN_ERR,
902 "Not enough memory for storing quotafile name");
903 return 0;
904 }
905 if (sbi->s_qf_names[qtype] &&
906 strcmp(sbi->s_qf_names[qtype], qname)) {
907 ext3_msg(sb, KERN_ERR,
908 "%s quota file already specified", QTYPE2NAME(qtype));
909 kfree(qname);
910 return 0;
911 }
912 sbi->s_qf_names[qtype] = qname;
913 if (strchr(sbi->s_qf_names[qtype], '/')) {
914 ext3_msg(sb, KERN_ERR,
915 "quotafile must be on filesystem root");
916 kfree(sbi->s_qf_names[qtype]);
917 sbi->s_qf_names[qtype] = NULL;
918 return 0;
919 }
920 set_opt(sbi->s_mount_opt, QUOTA);
921 return 1;
922 }
923
924 static int clear_qf_name(struct super_block *sb, int qtype) {
925
926 struct ext3_sb_info *sbi = EXT3_SB(sb);
927
928 if (sb_any_quota_loaded(sb) &&
929 sbi->s_qf_names[qtype]) {
930 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
931 " when quota turned on");
932 return 0;
933 }
934 /*
935 * The space will be released later when all options are confirmed
936 * to be correct
937 */
938 sbi->s_qf_names[qtype] = NULL;
939 return 1;
940 }
941 #endif
942
943 static int parse_options (char *options, struct super_block *sb,
944 unsigned int *inum, unsigned long *journal_devnum,
945 ext3_fsblk_t *n_blocks_count, int is_remount)
946 {
947 struct ext3_sb_info *sbi = EXT3_SB(sb);
948 char * p;
949 substring_t args[MAX_OPT_ARGS];
950 int data_opt = 0;
951 int option;
952 #ifdef CONFIG_QUOTA
953 int qfmt;
954 #endif
955
956 if (!options)
957 return 1;
958
959 while ((p = strsep (&options, ",")) != NULL) {
960 int token;
961 if (!*p)
962 continue;
963 /*
964 * Initialize args struct so we know whether arg was
965 * found; some options take optional arguments.
966 */
967 args[0].to = args[0].from = 0;
968 token = match_token(p, tokens, args);
969 switch (token) {
970 case Opt_bsd_df:
971 clear_opt (sbi->s_mount_opt, MINIX_DF);
972 break;
973 case Opt_minix_df:
974 set_opt (sbi->s_mount_opt, MINIX_DF);
975 break;
976 case Opt_grpid:
977 set_opt (sbi->s_mount_opt, GRPID);
978 break;
979 case Opt_nogrpid:
980 clear_opt (sbi->s_mount_opt, GRPID);
981 break;
982 case Opt_resuid:
983 if (match_int(&args[0], &option))
984 return 0;
985 sbi->s_resuid = option;
986 break;
987 case Opt_resgid:
988 if (match_int(&args[0], &option))
989 return 0;
990 sbi->s_resgid = option;
991 break;
992 case Opt_sb:
993 /* handled by get_sb_block() instead of here */
994 /* *sb_block = match_int(&args[0]); */
995 break;
996 case Opt_err_panic:
997 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
998 clear_opt (sbi->s_mount_opt, ERRORS_RO);
999 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1000 break;
1001 case Opt_err_ro:
1002 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1003 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1004 set_opt (sbi->s_mount_opt, ERRORS_RO);
1005 break;
1006 case Opt_err_cont:
1007 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1008 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1009 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1010 break;
1011 case Opt_nouid32:
1012 set_opt (sbi->s_mount_opt, NO_UID32);
1013 break;
1014 case Opt_nocheck:
1015 clear_opt (sbi->s_mount_opt, CHECK);
1016 break;
1017 case Opt_debug:
1018 set_opt (sbi->s_mount_opt, DEBUG);
1019 break;
1020 case Opt_oldalloc:
1021 set_opt (sbi->s_mount_opt, OLDALLOC);
1022 break;
1023 case Opt_orlov:
1024 clear_opt (sbi->s_mount_opt, OLDALLOC);
1025 break;
1026 #ifdef CONFIG_EXT3_FS_XATTR
1027 case Opt_user_xattr:
1028 set_opt (sbi->s_mount_opt, XATTR_USER);
1029 break;
1030 case Opt_nouser_xattr:
1031 clear_opt (sbi->s_mount_opt, XATTR_USER);
1032 break;
1033 #else
1034 case Opt_user_xattr:
1035 case Opt_nouser_xattr:
1036 ext3_msg(sb, KERN_INFO,
1037 "(no)user_xattr options not supported");
1038 break;
1039 #endif
1040 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1041 case Opt_acl:
1042 set_opt(sbi->s_mount_opt, POSIX_ACL);
1043 break;
1044 case Opt_noacl:
1045 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1046 break;
1047 #else
1048 case Opt_acl:
1049 case Opt_noacl:
1050 ext3_msg(sb, KERN_INFO,
1051 "(no)acl options not supported");
1052 break;
1053 #endif
1054 case Opt_reservation:
1055 set_opt(sbi->s_mount_opt, RESERVATION);
1056 break;
1057 case Opt_noreservation:
1058 clear_opt(sbi->s_mount_opt, RESERVATION);
1059 break;
1060 case Opt_journal_update:
1061 /* @@@ FIXME */
1062 /* Eventually we will want to be able to create
1063 a journal file here. For now, only allow the
1064 user to specify an existing inode to be the
1065 journal file. */
1066 if (is_remount) {
1067 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1068 "journal on remount");
1069 return 0;
1070 }
1071 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1072 break;
1073 case Opt_journal_inum:
1074 if (is_remount) {
1075 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1076 "journal on remount");
1077 return 0;
1078 }
1079 if (match_int(&args[0], &option))
1080 return 0;
1081 *inum = option;
1082 break;
1083 case Opt_journal_dev:
1084 if (is_remount) {
1085 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1086 "journal on remount");
1087 return 0;
1088 }
1089 if (match_int(&args[0], &option))
1090 return 0;
1091 *journal_devnum = option;
1092 break;
1093 case Opt_noload:
1094 set_opt (sbi->s_mount_opt, NOLOAD);
1095 break;
1096 case Opt_commit:
1097 if (match_int(&args[0], &option))
1098 return 0;
1099 if (option < 0)
1100 return 0;
1101 if (option == 0)
1102 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1103 sbi->s_commit_interval = HZ * option;
1104 break;
1105 case Opt_data_journal:
1106 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1107 goto datacheck;
1108 case Opt_data_ordered:
1109 data_opt = EXT3_MOUNT_ORDERED_DATA;
1110 goto datacheck;
1111 case Opt_data_writeback:
1112 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1113 datacheck:
1114 if (is_remount) {
1115 if (test_opt(sb, DATA_FLAGS) == data_opt)
1116 break;
1117 ext3_msg(sb, KERN_ERR,
1118 "error: cannot change "
1119 "data mode on remount. The filesystem "
1120 "is mounted in data=%s mode and you "
1121 "try to remount it in data=%s mode.",
1122 data_mode_string(test_opt(sb,
1123 DATA_FLAGS)),
1124 data_mode_string(data_opt));
1125 return 0;
1126 } else {
1127 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1128 sbi->s_mount_opt |= data_opt;
1129 }
1130 break;
1131 case Opt_data_err_abort:
1132 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1133 break;
1134 case Opt_data_err_ignore:
1135 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1136 break;
1137 #ifdef CONFIG_QUOTA
1138 case Opt_usrjquota:
1139 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1140 return 0;
1141 break;
1142 case Opt_grpjquota:
1143 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1144 return 0;
1145 break;
1146 case Opt_offusrjquota:
1147 if (!clear_qf_name(sb, USRQUOTA))
1148 return 0;
1149 break;
1150 case Opt_offgrpjquota:
1151 if (!clear_qf_name(sb, GRPQUOTA))
1152 return 0;
1153 break;
1154 case Opt_jqfmt_vfsold:
1155 qfmt = QFMT_VFS_OLD;
1156 goto set_qf_format;
1157 case Opt_jqfmt_vfsv0:
1158 qfmt = QFMT_VFS_V0;
1159 goto set_qf_format;
1160 case Opt_jqfmt_vfsv1:
1161 qfmt = QFMT_VFS_V1;
1162 set_qf_format:
1163 if (sb_any_quota_loaded(sb) &&
1164 sbi->s_jquota_fmt != qfmt) {
1165 ext3_msg(sb, KERN_ERR, "error: cannot change "
1166 "journaled quota options when "
1167 "quota turned on.");
1168 return 0;
1169 }
1170 sbi->s_jquota_fmt = qfmt;
1171 break;
1172 case Opt_quota:
1173 case Opt_usrquota:
1174 set_opt(sbi->s_mount_opt, QUOTA);
1175 set_opt(sbi->s_mount_opt, USRQUOTA);
1176 break;
1177 case Opt_grpquota:
1178 set_opt(sbi->s_mount_opt, QUOTA);
1179 set_opt(sbi->s_mount_opt, GRPQUOTA);
1180 break;
1181 case Opt_noquota:
1182 if (sb_any_quota_loaded(sb)) {
1183 ext3_msg(sb, KERN_ERR, "error: cannot change "
1184 "quota options when quota turned on.");
1185 return 0;
1186 }
1187 clear_opt(sbi->s_mount_opt, QUOTA);
1188 clear_opt(sbi->s_mount_opt, USRQUOTA);
1189 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1190 break;
1191 #else
1192 case Opt_quota:
1193 case Opt_usrquota:
1194 case Opt_grpquota:
1195 ext3_msg(sb, KERN_ERR,
1196 "error: quota options not supported.");
1197 break;
1198 case Opt_usrjquota:
1199 case Opt_grpjquota:
1200 case Opt_offusrjquota:
1201 case Opt_offgrpjquota:
1202 case Opt_jqfmt_vfsold:
1203 case Opt_jqfmt_vfsv0:
1204 case Opt_jqfmt_vfsv1:
1205 ext3_msg(sb, KERN_ERR,
1206 "error: journaled quota options not "
1207 "supported.");
1208 break;
1209 case Opt_noquota:
1210 break;
1211 #endif
1212 case Opt_abort:
1213 set_opt(sbi->s_mount_opt, ABORT);
1214 break;
1215 case Opt_nobarrier:
1216 clear_opt(sbi->s_mount_opt, BARRIER);
1217 break;
1218 case Opt_barrier:
1219 if (args[0].from) {
1220 if (match_int(&args[0], &option))
1221 return 0;
1222 } else
1223 option = 1; /* No argument, default to 1 */
1224 if (option)
1225 set_opt(sbi->s_mount_opt, BARRIER);
1226 else
1227 clear_opt(sbi->s_mount_opt, BARRIER);
1228 break;
1229 case Opt_ignore:
1230 break;
1231 case Opt_resize:
1232 if (!is_remount) {
1233 ext3_msg(sb, KERN_ERR,
1234 "error: resize option only available "
1235 "for remount");
1236 return 0;
1237 }
1238 if (match_int(&args[0], &option) != 0)
1239 return 0;
1240 *n_blocks_count = option;
1241 break;
1242 case Opt_nobh:
1243 ext3_msg(sb, KERN_WARNING,
1244 "warning: ignoring deprecated nobh option");
1245 break;
1246 case Opt_bh:
1247 ext3_msg(sb, KERN_WARNING,
1248 "warning: ignoring deprecated bh option");
1249 break;
1250 default:
1251 ext3_msg(sb, KERN_ERR,
1252 "error: unrecognized mount option \"%s\" "
1253 "or missing value", p);
1254 return 0;
1255 }
1256 }
1257 #ifdef CONFIG_QUOTA
1258 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1259 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1260 clear_opt(sbi->s_mount_opt, USRQUOTA);
1261 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1262 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1263
1264 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1265 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1266 "format mixing.");
1267 return 0;
1268 }
1269
1270 if (!sbi->s_jquota_fmt) {
1271 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1272 "not specified.");
1273 return 0;
1274 }
1275 } else {
1276 if (sbi->s_jquota_fmt) {
1277 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1278 "specified with no journaling "
1279 "enabled.");
1280 return 0;
1281 }
1282 }
1283 #endif
1284 return 1;
1285 }
1286
1287 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1288 int read_only)
1289 {
1290 struct ext3_sb_info *sbi = EXT3_SB(sb);
1291 int res = 0;
1292
1293 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1294 ext3_msg(sb, KERN_ERR,
1295 "error: revision level too high, "
1296 "forcing read-only mode");
1297 res = MS_RDONLY;
1298 }
1299 if (read_only)
1300 return res;
1301 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1302 ext3_msg(sb, KERN_WARNING,
1303 "warning: mounting unchecked fs, "
1304 "running e2fsck is recommended");
1305 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1306 ext3_msg(sb, KERN_WARNING,
1307 "warning: mounting fs with errors, "
1308 "running e2fsck is recommended");
1309 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1310 le16_to_cpu(es->s_mnt_count) >=
1311 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1312 ext3_msg(sb, KERN_WARNING,
1313 "warning: maximal mount count reached, "
1314 "running e2fsck is recommended");
1315 else if (le32_to_cpu(es->s_checkinterval) &&
1316 (le32_to_cpu(es->s_lastcheck) +
1317 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1318 ext3_msg(sb, KERN_WARNING,
1319 "warning: checktime reached, "
1320 "running e2fsck is recommended");
1321 #if 0
1322 /* @@@ We _will_ want to clear the valid bit if we find
1323 inconsistencies, to force a fsck at reboot. But for
1324 a plain journaled filesystem we can keep it set as
1325 valid forever! :) */
1326 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1327 #endif
1328 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1329 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1330 le16_add_cpu(&es->s_mnt_count, 1);
1331 es->s_mtime = cpu_to_le32(get_seconds());
1332 ext3_update_dynamic_rev(sb);
1333 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1334
1335 ext3_commit_super(sb, es, 1);
1336 if (test_opt(sb, DEBUG))
1337 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1338 "bpg=%lu, ipg=%lu, mo=%04lx]",
1339 sb->s_blocksize,
1340 sbi->s_groups_count,
1341 EXT3_BLOCKS_PER_GROUP(sb),
1342 EXT3_INODES_PER_GROUP(sb),
1343 sbi->s_mount_opt);
1344
1345 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1346 char b[BDEVNAME_SIZE];
1347 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1348 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1349 } else {
1350 ext3_msg(sb, KERN_INFO, "using internal journal");
1351 }
1352 return res;
1353 }
1354
1355 /* Called at mount-time, super-block is locked */
1356 static int ext3_check_descriptors(struct super_block *sb)
1357 {
1358 struct ext3_sb_info *sbi = EXT3_SB(sb);
1359 int i;
1360
1361 ext3_debug ("Checking group descriptors");
1362
1363 for (i = 0; i < sbi->s_groups_count; i++) {
1364 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1365 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1366 ext3_fsblk_t last_block;
1367
1368 if (i == sbi->s_groups_count - 1)
1369 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1370 else
1371 last_block = first_block +
1372 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1373
1374 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1375 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1376 {
1377 ext3_error (sb, "ext3_check_descriptors",
1378 "Block bitmap for group %d"
1379 " not in group (block %lu)!",
1380 i, (unsigned long)
1381 le32_to_cpu(gdp->bg_block_bitmap));
1382 return 0;
1383 }
1384 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1385 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1386 {
1387 ext3_error (sb, "ext3_check_descriptors",
1388 "Inode bitmap for group %d"
1389 " not in group (block %lu)!",
1390 i, (unsigned long)
1391 le32_to_cpu(gdp->bg_inode_bitmap));
1392 return 0;
1393 }
1394 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1395 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1396 last_block)
1397 {
1398 ext3_error (sb, "ext3_check_descriptors",
1399 "Inode table for group %d"
1400 " not in group (block %lu)!",
1401 i, (unsigned long)
1402 le32_to_cpu(gdp->bg_inode_table));
1403 return 0;
1404 }
1405 }
1406
1407 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1408 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1409 return 1;
1410 }
1411
1412
1413 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1414 * the superblock) which were deleted from all directories, but held open by
1415 * a process at the time of a crash. We walk the list and try to delete these
1416 * inodes at recovery time (only with a read-write filesystem).
1417 *
1418 * In order to keep the orphan inode chain consistent during traversal (in
1419 * case of crash during recovery), we link each inode into the superblock
1420 * orphan list_head and handle it the same way as an inode deletion during
1421 * normal operation (which journals the operations for us).
1422 *
1423 * We only do an iget() and an iput() on each inode, which is very safe if we
1424 * accidentally point at an in-use or already deleted inode. The worst that
1425 * can happen in this case is that we get a "bit already cleared" message from
1426 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1427 * e2fsck was run on this filesystem, and it must have already done the orphan
1428 * inode cleanup for us, so we can safely abort without any further action.
1429 */
1430 static void ext3_orphan_cleanup (struct super_block * sb,
1431 struct ext3_super_block * es)
1432 {
1433 unsigned int s_flags = sb->s_flags;
1434 int nr_orphans = 0, nr_truncates = 0;
1435 #ifdef CONFIG_QUOTA
1436 int i;
1437 #endif
1438 if (!es->s_last_orphan) {
1439 jbd_debug(4, "no orphan inodes to clean up\n");
1440 return;
1441 }
1442
1443 if (bdev_read_only(sb->s_bdev)) {
1444 ext3_msg(sb, KERN_ERR, "error: write access "
1445 "unavailable, skipping orphan cleanup.");
1446 return;
1447 }
1448
1449 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1450 if (es->s_last_orphan)
1451 jbd_debug(1, "Errors on filesystem, "
1452 "clearing orphan list.\n");
1453 es->s_last_orphan = 0;
1454 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1455 return;
1456 }
1457
1458 if (s_flags & MS_RDONLY) {
1459 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1460 sb->s_flags &= ~MS_RDONLY;
1461 }
1462 #ifdef CONFIG_QUOTA
1463 /* Needed for iput() to work correctly and not trash data */
1464 sb->s_flags |= MS_ACTIVE;
1465 /* Turn on quotas so that they are updated correctly */
1466 for (i = 0; i < MAXQUOTAS; i++) {
1467 if (EXT3_SB(sb)->s_qf_names[i]) {
1468 int ret = ext3_quota_on_mount(sb, i);
1469 if (ret < 0)
1470 ext3_msg(sb, KERN_ERR,
1471 "error: cannot turn on journaled "
1472 "quota: %d", ret);
1473 }
1474 }
1475 #endif
1476
1477 while (es->s_last_orphan) {
1478 struct inode *inode;
1479
1480 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1481 if (IS_ERR(inode)) {
1482 es->s_last_orphan = 0;
1483 break;
1484 }
1485
1486 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1487 dquot_initialize(inode);
1488 if (inode->i_nlink) {
1489 printk(KERN_DEBUG
1490 "%s: truncating inode %lu to %Ld bytes\n",
1491 __func__, inode->i_ino, inode->i_size);
1492 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1493 inode->i_ino, inode->i_size);
1494 ext3_truncate(inode);
1495 nr_truncates++;
1496 } else {
1497 printk(KERN_DEBUG
1498 "%s: deleting unreferenced inode %lu\n",
1499 __func__, inode->i_ino);
1500 jbd_debug(2, "deleting unreferenced inode %lu\n",
1501 inode->i_ino);
1502 nr_orphans++;
1503 }
1504 iput(inode); /* The delete magic happens here! */
1505 }
1506
1507 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1508
1509 if (nr_orphans)
1510 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1511 PLURAL(nr_orphans));
1512 if (nr_truncates)
1513 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1514 PLURAL(nr_truncates));
1515 #ifdef CONFIG_QUOTA
1516 /* Turn quotas off */
1517 for (i = 0; i < MAXQUOTAS; i++) {
1518 if (sb_dqopt(sb)->files[i])
1519 dquot_quota_off(sb, i);
1520 }
1521 #endif
1522 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1523 }
1524
1525 /*
1526 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1527 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1528 * We need to be 1 filesystem block less than the 2^32 sector limit.
1529 */
1530 static loff_t ext3_max_size(int bits)
1531 {
1532 loff_t res = EXT3_NDIR_BLOCKS;
1533 int meta_blocks;
1534 loff_t upper_limit;
1535
1536 /* This is calculated to be the largest file size for a
1537 * dense, file such that the total number of
1538 * sectors in the file, including data and all indirect blocks,
1539 * does not exceed 2^32 -1
1540 * __u32 i_blocks representing the total number of
1541 * 512 bytes blocks of the file
1542 */
1543 upper_limit = (1LL << 32) - 1;
1544
1545 /* total blocks in file system block size */
1546 upper_limit >>= (bits - 9);
1547
1548
1549 /* indirect blocks */
1550 meta_blocks = 1;
1551 /* double indirect blocks */
1552 meta_blocks += 1 + (1LL << (bits-2));
1553 /* tripple indirect blocks */
1554 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1555
1556 upper_limit -= meta_blocks;
1557 upper_limit <<= bits;
1558
1559 res += 1LL << (bits-2);
1560 res += 1LL << (2*(bits-2));
1561 res += 1LL << (3*(bits-2));
1562 res <<= bits;
1563 if (res > upper_limit)
1564 res = upper_limit;
1565
1566 if (res > MAX_LFS_FILESIZE)
1567 res = MAX_LFS_FILESIZE;
1568
1569 return res;
1570 }
1571
1572 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1573 ext3_fsblk_t logic_sb_block,
1574 int nr)
1575 {
1576 struct ext3_sb_info *sbi = EXT3_SB(sb);
1577 unsigned long bg, first_meta_bg;
1578 int has_super = 0;
1579
1580 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1581
1582 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1583 nr < first_meta_bg)
1584 return (logic_sb_block + nr + 1);
1585 bg = sbi->s_desc_per_block * nr;
1586 if (ext3_bg_has_super(sb, bg))
1587 has_super = 1;
1588 return (has_super + ext3_group_first_block_no(sb, bg));
1589 }
1590
1591
1592 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1593 {
1594 struct buffer_head * bh;
1595 struct ext3_super_block *es = NULL;
1596 struct ext3_sb_info *sbi;
1597 ext3_fsblk_t block;
1598 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1599 ext3_fsblk_t logic_sb_block;
1600 unsigned long offset = 0;
1601 unsigned int journal_inum = 0;
1602 unsigned long journal_devnum = 0;
1603 unsigned long def_mount_opts;
1604 struct inode *root;
1605 int blocksize;
1606 int hblock;
1607 int db_count;
1608 int i;
1609 int needs_recovery;
1610 int ret = -EINVAL;
1611 __le32 features;
1612 int err;
1613
1614 lock_kernel();
1615
1616 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1617 if (!sbi) {
1618 unlock_kernel();
1619 return -ENOMEM;
1620 }
1621
1622 sbi->s_blockgroup_lock =
1623 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1624 if (!sbi->s_blockgroup_lock) {
1625 kfree(sbi);
1626 unlock_kernel();
1627 return -ENOMEM;
1628 }
1629 sb->s_fs_info = sbi;
1630 sbi->s_mount_opt = 0;
1631 sbi->s_resuid = EXT3_DEF_RESUID;
1632 sbi->s_resgid = EXT3_DEF_RESGID;
1633 sbi->s_sb_block = sb_block;
1634
1635 unlock_kernel();
1636
1637 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1638 if (!blocksize) {
1639 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1640 goto out_fail;
1641 }
1642
1643 /*
1644 * The ext3 superblock will not be buffer aligned for other than 1kB
1645 * block sizes. We need to calculate the offset from buffer start.
1646 */
1647 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1648 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1649 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1650 } else {
1651 logic_sb_block = sb_block;
1652 }
1653
1654 if (!(bh = sb_bread(sb, logic_sb_block))) {
1655 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1656 goto out_fail;
1657 }
1658 /*
1659 * Note: s_es must be initialized as soon as possible because
1660 * some ext3 macro-instructions depend on its value
1661 */
1662 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1663 sbi->s_es = es;
1664 sb->s_magic = le16_to_cpu(es->s_magic);
1665 if (sb->s_magic != EXT3_SUPER_MAGIC)
1666 goto cantfind_ext3;
1667
1668 /* Set defaults before we parse the mount options */
1669 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1670 if (def_mount_opts & EXT3_DEFM_DEBUG)
1671 set_opt(sbi->s_mount_opt, DEBUG);
1672 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1673 set_opt(sbi->s_mount_opt, GRPID);
1674 if (def_mount_opts & EXT3_DEFM_UID16)
1675 set_opt(sbi->s_mount_opt, NO_UID32);
1676 #ifdef CONFIG_EXT3_FS_XATTR
1677 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1678 set_opt(sbi->s_mount_opt, XATTR_USER);
1679 #endif
1680 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1681 if (def_mount_opts & EXT3_DEFM_ACL)
1682 set_opt(sbi->s_mount_opt, POSIX_ACL);
1683 #endif
1684 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1685 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1686 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1687 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1688 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1689 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1690
1691 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1692 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1693 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1694 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1695 else
1696 set_opt(sbi->s_mount_opt, ERRORS_RO);
1697
1698 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1699 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1700
1701 set_opt(sbi->s_mount_opt, RESERVATION);
1702
1703 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1704 NULL, 0))
1705 goto failed_mount;
1706
1707 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1708 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1709
1710 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1711 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1712 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1713 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1714 ext3_msg(sb, KERN_WARNING,
1715 "warning: feature flags set on rev 0 fs, "
1716 "running e2fsck is recommended");
1717 /*
1718 * Check feature flags regardless of the revision level, since we
1719 * previously didn't change the revision level when setting the flags,
1720 * so there is a chance incompat flags are set on a rev 0 filesystem.
1721 */
1722 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1723 if (features) {
1724 ext3_msg(sb, KERN_ERR,
1725 "error: couldn't mount because of unsupported "
1726 "optional features (%x)", le32_to_cpu(features));
1727 goto failed_mount;
1728 }
1729 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1730 if (!(sb->s_flags & MS_RDONLY) && features) {
1731 ext3_msg(sb, KERN_ERR,
1732 "error: couldn't mount RDWR because of unsupported "
1733 "optional features (%x)", le32_to_cpu(features));
1734 goto failed_mount;
1735 }
1736 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1737
1738 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1739 blocksize > EXT3_MAX_BLOCK_SIZE) {
1740 ext3_msg(sb, KERN_ERR,
1741 "error: couldn't mount because of unsupported "
1742 "filesystem blocksize %d", blocksize);
1743 goto failed_mount;
1744 }
1745
1746 hblock = bdev_logical_block_size(sb->s_bdev);
1747 if (sb->s_blocksize != blocksize) {
1748 /*
1749 * Make sure the blocksize for the filesystem is larger
1750 * than the hardware sectorsize for the machine.
1751 */
1752 if (blocksize < hblock) {
1753 ext3_msg(sb, KERN_ERR,
1754 "error: fsblocksize %d too small for "
1755 "hardware sectorsize %d", blocksize, hblock);
1756 goto failed_mount;
1757 }
1758
1759 brelse (bh);
1760 if (!sb_set_blocksize(sb, blocksize)) {
1761 ext3_msg(sb, KERN_ERR,
1762 "error: bad blocksize %d", blocksize);
1763 goto out_fail;
1764 }
1765 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1766 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1767 bh = sb_bread(sb, logic_sb_block);
1768 if (!bh) {
1769 ext3_msg(sb, KERN_ERR,
1770 "error: can't read superblock on 2nd try");
1771 goto failed_mount;
1772 }
1773 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1774 sbi->s_es = es;
1775 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1776 ext3_msg(sb, KERN_ERR,
1777 "error: magic mismatch");
1778 goto failed_mount;
1779 }
1780 }
1781
1782 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1783
1784 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1785 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1786 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1787 } else {
1788 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1789 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1790 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1791 (!is_power_of_2(sbi->s_inode_size)) ||
1792 (sbi->s_inode_size > blocksize)) {
1793 ext3_msg(sb, KERN_ERR,
1794 "error: unsupported inode size: %d",
1795 sbi->s_inode_size);
1796 goto failed_mount;
1797 }
1798 }
1799 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1800 le32_to_cpu(es->s_log_frag_size);
1801 if (blocksize != sbi->s_frag_size) {
1802 ext3_msg(sb, KERN_ERR,
1803 "error: fragsize %lu != blocksize %u (unsupported)",
1804 sbi->s_frag_size, blocksize);
1805 goto failed_mount;
1806 }
1807 sbi->s_frags_per_block = 1;
1808 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1809 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1810 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1811 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1812 goto cantfind_ext3;
1813 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1814 if (sbi->s_inodes_per_block == 0)
1815 goto cantfind_ext3;
1816 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1817 sbi->s_inodes_per_block;
1818 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1819 sbi->s_sbh = bh;
1820 sbi->s_mount_state = le16_to_cpu(es->s_state);
1821 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1822 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1823 for (i=0; i < 4; i++)
1824 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1825 sbi->s_def_hash_version = es->s_def_hash_version;
1826 i = le32_to_cpu(es->s_flags);
1827 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1828 sbi->s_hash_unsigned = 3;
1829 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1830 #ifdef __CHAR_UNSIGNED__
1831 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1832 sbi->s_hash_unsigned = 3;
1833 #else
1834 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1835 #endif
1836 }
1837
1838 if (sbi->s_blocks_per_group > blocksize * 8) {
1839 ext3_msg(sb, KERN_ERR,
1840 "#blocks per group too big: %lu",
1841 sbi->s_blocks_per_group);
1842 goto failed_mount;
1843 }
1844 if (sbi->s_frags_per_group > blocksize * 8) {
1845 ext3_msg(sb, KERN_ERR,
1846 "error: #fragments per group too big: %lu",
1847 sbi->s_frags_per_group);
1848 goto failed_mount;
1849 }
1850 if (sbi->s_inodes_per_group > blocksize * 8) {
1851 ext3_msg(sb, KERN_ERR,
1852 "error: #inodes per group too big: %lu",
1853 sbi->s_inodes_per_group);
1854 goto failed_mount;
1855 }
1856
1857 if (le32_to_cpu(es->s_blocks_count) >
1858 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1859 ext3_msg(sb, KERN_ERR,
1860 "error: filesystem is too large to mount safely");
1861 if (sizeof(sector_t) < 8)
1862 ext3_msg(sb, KERN_ERR,
1863 "error: CONFIG_LBDAF not enabled");
1864 goto failed_mount;
1865 }
1866
1867 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1868 goto cantfind_ext3;
1869 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1870 le32_to_cpu(es->s_first_data_block) - 1)
1871 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1872 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1873 EXT3_DESC_PER_BLOCK(sb);
1874 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1875 GFP_KERNEL);
1876 if (sbi->s_group_desc == NULL) {
1877 ext3_msg(sb, KERN_ERR,
1878 "error: not enough memory");
1879 goto failed_mount;
1880 }
1881
1882 bgl_lock_init(sbi->s_blockgroup_lock);
1883
1884 for (i = 0; i < db_count; i++) {
1885 block = descriptor_loc(sb, logic_sb_block, i);
1886 sbi->s_group_desc[i] = sb_bread(sb, block);
1887 if (!sbi->s_group_desc[i]) {
1888 ext3_msg(sb, KERN_ERR,
1889 "error: can't read group descriptor %d", i);
1890 db_count = i;
1891 goto failed_mount2;
1892 }
1893 }
1894 if (!ext3_check_descriptors (sb)) {
1895 ext3_msg(sb, KERN_ERR,
1896 "error: group descriptors corrupted");
1897 goto failed_mount2;
1898 }
1899 sbi->s_gdb_count = db_count;
1900 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1901 spin_lock_init(&sbi->s_next_gen_lock);
1902
1903 /* per fileystem reservation list head & lock */
1904 spin_lock_init(&sbi->s_rsv_window_lock);
1905 sbi->s_rsv_window_root = RB_ROOT;
1906 /* Add a single, static dummy reservation to the start of the
1907 * reservation window list --- it gives us a placeholder for
1908 * append-at-start-of-list which makes the allocation logic
1909 * _much_ simpler. */
1910 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1911 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1912 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1913 sbi->s_rsv_window_head.rsv_goal_size = 0;
1914 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1915
1916 /*
1917 * set up enough so that it can read an inode
1918 */
1919 sb->s_op = &ext3_sops;
1920 sb->s_export_op = &ext3_export_ops;
1921 sb->s_xattr = ext3_xattr_handlers;
1922 #ifdef CONFIG_QUOTA
1923 sb->s_qcop = &ext3_qctl_operations;
1924 sb->dq_op = &ext3_quota_operations;
1925 #endif
1926 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1927 mutex_init(&sbi->s_orphan_lock);
1928 mutex_init(&sbi->s_resize_lock);
1929
1930 sb->s_root = NULL;
1931
1932 needs_recovery = (es->s_last_orphan != 0 ||
1933 EXT3_HAS_INCOMPAT_FEATURE(sb,
1934 EXT3_FEATURE_INCOMPAT_RECOVER));
1935
1936 /*
1937 * The first inode we look at is the journal inode. Don't try
1938 * root first: it may be modified in the journal!
1939 */
1940 if (!test_opt(sb, NOLOAD) &&
1941 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1942 if (ext3_load_journal(sb, es, journal_devnum))
1943 goto failed_mount2;
1944 } else if (journal_inum) {
1945 if (ext3_create_journal(sb, es, journal_inum))
1946 goto failed_mount2;
1947 } else {
1948 if (!silent)
1949 ext3_msg(sb, KERN_ERR,
1950 "error: no journal found. "
1951 "mounting ext3 over ext2?");
1952 goto failed_mount2;
1953 }
1954 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1955 ext3_count_free_blocks(sb));
1956 if (!err) {
1957 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1958 ext3_count_free_inodes(sb));
1959 }
1960 if (!err) {
1961 err = percpu_counter_init(&sbi->s_dirs_counter,
1962 ext3_count_dirs(sb));
1963 }
1964 if (err) {
1965 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
1966 goto failed_mount3;
1967 }
1968
1969 /* We have now updated the journal if required, so we can
1970 * validate the data journaling mode. */
1971 switch (test_opt(sb, DATA_FLAGS)) {
1972 case 0:
1973 /* No mode set, assume a default based on the journal
1974 capabilities: ORDERED_DATA if the journal can
1975 cope, else JOURNAL_DATA */
1976 if (journal_check_available_features
1977 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1978 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1979 else
1980 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1981 break;
1982
1983 case EXT3_MOUNT_ORDERED_DATA:
1984 case EXT3_MOUNT_WRITEBACK_DATA:
1985 if (!journal_check_available_features
1986 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1987 ext3_msg(sb, KERN_ERR,
1988 "error: journal does not support "
1989 "requested data journaling mode");
1990 goto failed_mount3;
1991 }
1992 default:
1993 break;
1994 }
1995
1996 /*
1997 * The journal_load will have done any necessary log recovery,
1998 * so we can safely mount the rest of the filesystem now.
1999 */
2000
2001 root = ext3_iget(sb, EXT3_ROOT_INO);
2002 if (IS_ERR(root)) {
2003 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2004 ret = PTR_ERR(root);
2005 goto failed_mount3;
2006 }
2007 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2008 iput(root);
2009 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2010 goto failed_mount3;
2011 }
2012 sb->s_root = d_alloc_root(root);
2013 if (!sb->s_root) {
2014 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2015 iput(root);
2016 ret = -ENOMEM;
2017 goto failed_mount3;
2018 }
2019
2020 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2021
2022 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2023 ext3_orphan_cleanup(sb, es);
2024 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2025 if (needs_recovery)
2026 ext3_msg(sb, KERN_INFO, "recovery complete");
2027 ext3_mark_recovery_complete(sb, es);
2028 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2029 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2030 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2031 "writeback");
2032
2033 lock_kernel();
2034 unlock_kernel();
2035 return 0;
2036
2037 cantfind_ext3:
2038 if (!silent)
2039 ext3_msg(sb, KERN_INFO,
2040 "error: can't find ext3 filesystem on dev %s.",
2041 sb->s_id);
2042 goto failed_mount;
2043
2044 failed_mount3:
2045 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2046 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2047 percpu_counter_destroy(&sbi->s_dirs_counter);
2048 journal_destroy(sbi->s_journal);
2049 failed_mount2:
2050 for (i = 0; i < db_count; i++)
2051 brelse(sbi->s_group_desc[i]);
2052 kfree(sbi->s_group_desc);
2053 failed_mount:
2054 #ifdef CONFIG_QUOTA
2055 for (i = 0; i < MAXQUOTAS; i++)
2056 kfree(sbi->s_qf_names[i]);
2057 #endif
2058 ext3_blkdev_remove(sbi);
2059 brelse(bh);
2060 out_fail:
2061 sb->s_fs_info = NULL;
2062 kfree(sbi->s_blockgroup_lock);
2063 kfree(sbi);
2064 lock_kernel();
2065 unlock_kernel();
2066 return ret;
2067 }
2068
2069 /*
2070 * Setup any per-fs journal parameters now. We'll do this both on
2071 * initial mount, once the journal has been initialised but before we've
2072 * done any recovery; and again on any subsequent remount.
2073 */
2074 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2075 {
2076 struct ext3_sb_info *sbi = EXT3_SB(sb);
2077
2078 if (sbi->s_commit_interval)
2079 journal->j_commit_interval = sbi->s_commit_interval;
2080 /* We could also set up an ext3-specific default for the commit
2081 * interval here, but for now we'll just fall back to the jbd
2082 * default. */
2083
2084 spin_lock(&journal->j_state_lock);
2085 if (test_opt(sb, BARRIER))
2086 journal->j_flags |= JFS_BARRIER;
2087 else
2088 journal->j_flags &= ~JFS_BARRIER;
2089 if (test_opt(sb, DATA_ERR_ABORT))
2090 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2091 else
2092 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2093 spin_unlock(&journal->j_state_lock);
2094 }
2095
2096 static journal_t *ext3_get_journal(struct super_block *sb,
2097 unsigned int journal_inum)
2098 {
2099 struct inode *journal_inode;
2100 journal_t *journal;
2101
2102 /* First, test for the existence of a valid inode on disk. Bad
2103 * things happen if we iget() an unused inode, as the subsequent
2104 * iput() will try to delete it. */
2105
2106 journal_inode = ext3_iget(sb, journal_inum);
2107 if (IS_ERR(journal_inode)) {
2108 ext3_msg(sb, KERN_ERR, "error: no journal found");
2109 return NULL;
2110 }
2111 if (!journal_inode->i_nlink) {
2112 make_bad_inode(journal_inode);
2113 iput(journal_inode);
2114 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2115 return NULL;
2116 }
2117
2118 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2119 journal_inode, journal_inode->i_size);
2120 if (!S_ISREG(journal_inode->i_mode)) {
2121 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2122 iput(journal_inode);
2123 return NULL;
2124 }
2125
2126 journal = journal_init_inode(journal_inode);
2127 if (!journal) {
2128 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2129 iput(journal_inode);
2130 return NULL;
2131 }
2132 journal->j_private = sb;
2133 ext3_init_journal_params(sb, journal);
2134 return journal;
2135 }
2136
2137 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2138 dev_t j_dev)
2139 {
2140 struct buffer_head * bh;
2141 journal_t *journal;
2142 ext3_fsblk_t start;
2143 ext3_fsblk_t len;
2144 int hblock, blocksize;
2145 ext3_fsblk_t sb_block;
2146 unsigned long offset;
2147 struct ext3_super_block * es;
2148 struct block_device *bdev;
2149
2150 bdev = ext3_blkdev_get(j_dev, sb);
2151 if (bdev == NULL)
2152 return NULL;
2153
2154 if (bd_claim(bdev, sb)) {
2155 ext3_msg(sb, KERN_ERR,
2156 "error: failed to claim external journal device");
2157 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2158 return NULL;
2159 }
2160
2161 blocksize = sb->s_blocksize;
2162 hblock = bdev_logical_block_size(bdev);
2163 if (blocksize < hblock) {
2164 ext3_msg(sb, KERN_ERR,
2165 "error: blocksize too small for journal device");
2166 goto out_bdev;
2167 }
2168
2169 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2170 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2171 set_blocksize(bdev, blocksize);
2172 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2173 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2174 "external journal");
2175 goto out_bdev;
2176 }
2177
2178 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2179 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2180 !(le32_to_cpu(es->s_feature_incompat) &
2181 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2182 ext3_msg(sb, KERN_ERR, "error: external journal has "
2183 "bad superblock");
2184 brelse(bh);
2185 goto out_bdev;
2186 }
2187
2188 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2189 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2190 brelse(bh);
2191 goto out_bdev;
2192 }
2193
2194 len = le32_to_cpu(es->s_blocks_count);
2195 start = sb_block + 1;
2196 brelse(bh); /* we're done with the superblock */
2197
2198 journal = journal_init_dev(bdev, sb->s_bdev,
2199 start, len, blocksize);
2200 if (!journal) {
2201 ext3_msg(sb, KERN_ERR,
2202 "error: failed to create device journal");
2203 goto out_bdev;
2204 }
2205 journal->j_private = sb;
2206 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2207 wait_on_buffer(journal->j_sb_buffer);
2208 if (!buffer_uptodate(journal->j_sb_buffer)) {
2209 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2210 goto out_journal;
2211 }
2212 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2213 ext3_msg(sb, KERN_ERR,
2214 "error: external journal has more than one "
2215 "user (unsupported) - %d",
2216 be32_to_cpu(journal->j_superblock->s_nr_users));
2217 goto out_journal;
2218 }
2219 EXT3_SB(sb)->journal_bdev = bdev;
2220 ext3_init_journal_params(sb, journal);
2221 return journal;
2222 out_journal:
2223 journal_destroy(journal);
2224 out_bdev:
2225 ext3_blkdev_put(bdev);
2226 return NULL;
2227 }
2228
2229 static int ext3_load_journal(struct super_block *sb,
2230 struct ext3_super_block *es,
2231 unsigned long journal_devnum)
2232 {
2233 journal_t *journal;
2234 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2235 dev_t journal_dev;
2236 int err = 0;
2237 int really_read_only;
2238
2239 if (journal_devnum &&
2240 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2241 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2242 "numbers have changed");
2243 journal_dev = new_decode_dev(journal_devnum);
2244 } else
2245 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2246
2247 really_read_only = bdev_read_only(sb->s_bdev);
2248
2249 /*
2250 * Are we loading a blank journal or performing recovery after a
2251 * crash? For recovery, we need to check in advance whether we
2252 * can get read-write access to the device.
2253 */
2254
2255 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2256 if (sb->s_flags & MS_RDONLY) {
2257 ext3_msg(sb, KERN_INFO,
2258 "recovery required on readonly filesystem");
2259 if (really_read_only) {
2260 ext3_msg(sb, KERN_ERR, "error: write access "
2261 "unavailable, cannot proceed");
2262 return -EROFS;
2263 }
2264 ext3_msg(sb, KERN_INFO,
2265 "write access will be enabled during recovery");
2266 }
2267 }
2268
2269 if (journal_inum && journal_dev) {
2270 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2271 "and inode journals");
2272 return -EINVAL;
2273 }
2274
2275 if (journal_inum) {
2276 if (!(journal = ext3_get_journal(sb, journal_inum)))
2277 return -EINVAL;
2278 } else {
2279 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2280 return -EINVAL;
2281 }
2282
2283 if (!(journal->j_flags & JFS_BARRIER))
2284 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2285
2286 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2287 err = journal_update_format(journal);
2288 if (err) {
2289 ext3_msg(sb, KERN_ERR, "error updating journal");
2290 journal_destroy(journal);
2291 return err;
2292 }
2293 }
2294
2295 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2296 err = journal_wipe(journal, !really_read_only);
2297 if (!err)
2298 err = journal_load(journal);
2299
2300 if (err) {
2301 ext3_msg(sb, KERN_ERR, "error loading journal");
2302 journal_destroy(journal);
2303 return err;
2304 }
2305
2306 EXT3_SB(sb)->s_journal = journal;
2307 ext3_clear_journal_err(sb, es);
2308
2309 if (journal_devnum &&
2310 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2311 es->s_journal_dev = cpu_to_le32(journal_devnum);
2312
2313 /* Make sure we flush the recovery flag to disk. */
2314 ext3_commit_super(sb, es, 1);
2315 }
2316
2317 return 0;
2318 }
2319
2320 static int ext3_create_journal(struct super_block *sb,
2321 struct ext3_super_block *es,
2322 unsigned int journal_inum)
2323 {
2324 journal_t *journal;
2325 int err;
2326
2327 if (sb->s_flags & MS_RDONLY) {
2328 ext3_msg(sb, KERN_ERR,
2329 "error: readonly filesystem when trying to "
2330 "create journal");
2331 return -EROFS;
2332 }
2333
2334 journal = ext3_get_journal(sb, journal_inum);
2335 if (!journal)
2336 return -EINVAL;
2337
2338 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2339 journal_inum);
2340
2341 err = journal_create(journal);
2342 if (err) {
2343 ext3_msg(sb, KERN_ERR, "error creating journal");
2344 journal_destroy(journal);
2345 return -EIO;
2346 }
2347
2348 EXT3_SB(sb)->s_journal = journal;
2349
2350 ext3_update_dynamic_rev(sb);
2351 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2352 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2353
2354 es->s_journal_inum = cpu_to_le32(journal_inum);
2355
2356 /* Make sure we flush the recovery flag to disk. */
2357 ext3_commit_super(sb, es, 1);
2358
2359 return 0;
2360 }
2361
2362 static int ext3_commit_super(struct super_block *sb,
2363 struct ext3_super_block *es,
2364 int sync)
2365 {
2366 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2367 int error = 0;
2368
2369 if (!sbh)
2370 return error;
2371 /*
2372 * If the file system is mounted read-only, don't update the
2373 * superblock write time. This avoids updating the superblock
2374 * write time when we are mounting the root file system
2375 * read/only but we need to replay the journal; at that point,
2376 * for people who are east of GMT and who make their clock
2377 * tick in localtime for Windows bug-for-bug compatibility,
2378 * the clock is set in the future, and this will cause e2fsck
2379 * to complain and force a full file system check.
2380 */
2381 if (!(sb->s_flags & MS_RDONLY))
2382 es->s_wtime = cpu_to_le32(get_seconds());
2383 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2384 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2385 BUFFER_TRACE(sbh, "marking dirty");
2386 mark_buffer_dirty(sbh);
2387 if (sync)
2388 error = sync_dirty_buffer(sbh);
2389 return error;
2390 }
2391
2392
2393 /*
2394 * Have we just finished recovery? If so, and if we are mounting (or
2395 * remounting) the filesystem readonly, then we will end up with a
2396 * consistent fs on disk. Record that fact.
2397 */
2398 static void ext3_mark_recovery_complete(struct super_block * sb,
2399 struct ext3_super_block * es)
2400 {
2401 journal_t *journal = EXT3_SB(sb)->s_journal;
2402
2403 journal_lock_updates(journal);
2404 if (journal_flush(journal) < 0)
2405 goto out;
2406
2407 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2408 sb->s_flags & MS_RDONLY) {
2409 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2410 ext3_commit_super(sb, es, 1);
2411 }
2412
2413 out:
2414 journal_unlock_updates(journal);
2415 }
2416
2417 /*
2418 * If we are mounting (or read-write remounting) a filesystem whose journal
2419 * has recorded an error from a previous lifetime, move that error to the
2420 * main filesystem now.
2421 */
2422 static void ext3_clear_journal_err(struct super_block *sb,
2423 struct ext3_super_block *es)
2424 {
2425 journal_t *journal;
2426 int j_errno;
2427 const char *errstr;
2428
2429 journal = EXT3_SB(sb)->s_journal;
2430
2431 /*
2432 * Now check for any error status which may have been recorded in the
2433 * journal by a prior ext3_error() or ext3_abort()
2434 */
2435
2436 j_errno = journal_errno(journal);
2437 if (j_errno) {
2438 char nbuf[16];
2439
2440 errstr = ext3_decode_error(sb, j_errno, nbuf);
2441 ext3_warning(sb, __func__, "Filesystem error recorded "
2442 "from previous mount: %s", errstr);
2443 ext3_warning(sb, __func__, "Marking fs in need of "
2444 "filesystem check.");
2445
2446 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2447 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2448 ext3_commit_super (sb, es, 1);
2449
2450 journal_clear_err(journal);
2451 }
2452 }
2453
2454 /*
2455 * Force the running and committing transactions to commit,
2456 * and wait on the commit.
2457 */
2458 int ext3_force_commit(struct super_block *sb)
2459 {
2460 journal_t *journal;
2461 int ret;
2462
2463 if (sb->s_flags & MS_RDONLY)
2464 return 0;
2465
2466 journal = EXT3_SB(sb)->s_journal;
2467 ret = ext3_journal_force_commit(journal);
2468 return ret;
2469 }
2470
2471 static int ext3_sync_fs(struct super_block *sb, int wait)
2472 {
2473 tid_t target;
2474
2475 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2476 if (wait)
2477 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2478 }
2479 return 0;
2480 }
2481
2482 /*
2483 * LVM calls this function before a (read-only) snapshot is created. This
2484 * gives us a chance to flush the journal completely and mark the fs clean.
2485 */
2486 static int ext3_freeze(struct super_block *sb)
2487 {
2488 int error = 0;
2489 journal_t *journal;
2490
2491 if (!(sb->s_flags & MS_RDONLY)) {
2492 journal = EXT3_SB(sb)->s_journal;
2493
2494 /* Now we set up the journal barrier. */
2495 journal_lock_updates(journal);
2496
2497 /*
2498 * We don't want to clear needs_recovery flag when we failed
2499 * to flush the journal.
2500 */
2501 error = journal_flush(journal);
2502 if (error < 0)
2503 goto out;
2504
2505 /* Journal blocked and flushed, clear needs_recovery flag. */
2506 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2507 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2508 if (error)
2509 goto out;
2510 }
2511 return 0;
2512
2513 out:
2514 journal_unlock_updates(journal);
2515 return error;
2516 }
2517
2518 /*
2519 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2520 * flag here, even though the filesystem is not technically dirty yet.
2521 */
2522 static int ext3_unfreeze(struct super_block *sb)
2523 {
2524 if (!(sb->s_flags & MS_RDONLY)) {
2525 lock_super(sb);
2526 /* Reser the needs_recovery flag before the fs is unlocked. */
2527 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2528 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2529 unlock_super(sb);
2530 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2531 }
2532 return 0;
2533 }
2534
2535 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2536 {
2537 struct ext3_super_block * es;
2538 struct ext3_sb_info *sbi = EXT3_SB(sb);
2539 ext3_fsblk_t n_blocks_count = 0;
2540 unsigned long old_sb_flags;
2541 struct ext3_mount_options old_opts;
2542 int enable_quota = 0;
2543 int err;
2544 #ifdef CONFIG_QUOTA
2545 int i;
2546 #endif
2547
2548 lock_kernel();
2549
2550 /* Store the original options */
2551 lock_super(sb);
2552 old_sb_flags = sb->s_flags;
2553 old_opts.s_mount_opt = sbi->s_mount_opt;
2554 old_opts.s_resuid = sbi->s_resuid;
2555 old_opts.s_resgid = sbi->s_resgid;
2556 old_opts.s_commit_interval = sbi->s_commit_interval;
2557 #ifdef CONFIG_QUOTA
2558 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2559 for (i = 0; i < MAXQUOTAS; i++)
2560 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2561 #endif
2562
2563 /*
2564 * Allow the "check" option to be passed as a remount option.
2565 */
2566 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2567 err = -EINVAL;
2568 goto restore_opts;
2569 }
2570
2571 if (test_opt(sb, ABORT))
2572 ext3_abort(sb, __func__, "Abort forced by user");
2573
2574 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2575 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2576
2577 es = sbi->s_es;
2578
2579 ext3_init_journal_params(sb, sbi->s_journal);
2580
2581 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2582 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2583 if (test_opt(sb, ABORT)) {
2584 err = -EROFS;
2585 goto restore_opts;
2586 }
2587
2588 if (*flags & MS_RDONLY) {
2589 err = dquot_suspend(sb, -1);
2590 if (err < 0)
2591 goto restore_opts;
2592
2593 /*
2594 * First of all, the unconditional stuff we have to do
2595 * to disable replay of the journal when we next remount
2596 */
2597 sb->s_flags |= MS_RDONLY;
2598
2599 /*
2600 * OK, test if we are remounting a valid rw partition
2601 * readonly, and if so set the rdonly flag and then
2602 * mark the partition as valid again.
2603 */
2604 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2605 (sbi->s_mount_state & EXT3_VALID_FS))
2606 es->s_state = cpu_to_le16(sbi->s_mount_state);
2607
2608 ext3_mark_recovery_complete(sb, es);
2609 } else {
2610 __le32 ret;
2611 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2612 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2613 ext3_msg(sb, KERN_WARNING,
2614 "warning: couldn't remount RDWR "
2615 "because of unsupported optional "
2616 "features (%x)", le32_to_cpu(ret));
2617 err = -EROFS;
2618 goto restore_opts;
2619 }
2620
2621 /*
2622 * If we have an unprocessed orphan list hanging
2623 * around from a previously readonly bdev mount,
2624 * require a full umount/remount for now.
2625 */
2626 if (es->s_last_orphan) {
2627 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2628 "remount RDWR because of unprocessed "
2629 "orphan inode list. Please "
2630 "umount/remount instead.");
2631 err = -EINVAL;
2632 goto restore_opts;
2633 }
2634
2635 /*
2636 * Mounting a RDONLY partition read-write, so reread
2637 * and store the current valid flag. (It may have
2638 * been changed by e2fsck since we originally mounted
2639 * the partition.)
2640 */
2641 ext3_clear_journal_err(sb, es);
2642 sbi->s_mount_state = le16_to_cpu(es->s_state);
2643 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2644 goto restore_opts;
2645 if (!ext3_setup_super (sb, es, 0))
2646 sb->s_flags &= ~MS_RDONLY;
2647 enable_quota = 1;
2648 }
2649 }
2650 #ifdef CONFIG_QUOTA
2651 /* Release old quota file names */
2652 for (i = 0; i < MAXQUOTAS; i++)
2653 if (old_opts.s_qf_names[i] &&
2654 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2655 kfree(old_opts.s_qf_names[i]);
2656 #endif
2657 unlock_super(sb);
2658 unlock_kernel();
2659
2660 if (enable_quota)
2661 dquot_resume(sb, -1);
2662 return 0;
2663 restore_opts:
2664 sb->s_flags = old_sb_flags;
2665 sbi->s_mount_opt = old_opts.s_mount_opt;
2666 sbi->s_resuid = old_opts.s_resuid;
2667 sbi->s_resgid = old_opts.s_resgid;
2668 sbi->s_commit_interval = old_opts.s_commit_interval;
2669 #ifdef CONFIG_QUOTA
2670 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2671 for (i = 0; i < MAXQUOTAS; i++) {
2672 if (sbi->s_qf_names[i] &&
2673 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2674 kfree(sbi->s_qf_names[i]);
2675 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2676 }
2677 #endif
2678 unlock_super(sb);
2679 unlock_kernel();
2680 return err;
2681 }
2682
2683 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2684 {
2685 struct super_block *sb = dentry->d_sb;
2686 struct ext3_sb_info *sbi = EXT3_SB(sb);
2687 struct ext3_super_block *es = sbi->s_es;
2688 u64 fsid;
2689
2690 if (test_opt(sb, MINIX_DF)) {
2691 sbi->s_overhead_last = 0;
2692 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2693 unsigned long ngroups = sbi->s_groups_count, i;
2694 ext3_fsblk_t overhead = 0;
2695 smp_rmb();
2696
2697 /*
2698 * Compute the overhead (FS structures). This is constant
2699 * for a given filesystem unless the number of block groups
2700 * changes so we cache the previous value until it does.
2701 */
2702
2703 /*
2704 * All of the blocks before first_data_block are
2705 * overhead
2706 */
2707 overhead = le32_to_cpu(es->s_first_data_block);
2708
2709 /*
2710 * Add the overhead attributed to the superblock and
2711 * block group descriptors. If the sparse superblocks
2712 * feature is turned on, then not all groups have this.
2713 */
2714 for (i = 0; i < ngroups; i++) {
2715 overhead += ext3_bg_has_super(sb, i) +
2716 ext3_bg_num_gdb(sb, i);
2717 cond_resched();
2718 }
2719
2720 /*
2721 * Every block group has an inode bitmap, a block
2722 * bitmap, and an inode table.
2723 */
2724 overhead += ngroups * (2 + sbi->s_itb_per_group);
2725 sbi->s_overhead_last = overhead;
2726 smp_wmb();
2727 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2728 }
2729
2730 buf->f_type = EXT3_SUPER_MAGIC;
2731 buf->f_bsize = sb->s_blocksize;
2732 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2733 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2734 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2735 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2736 buf->f_bavail = 0;
2737 buf->f_files = le32_to_cpu(es->s_inodes_count);
2738 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2739 buf->f_namelen = EXT3_NAME_LEN;
2740 fsid = le64_to_cpup((void *)es->s_uuid) ^
2741 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2742 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2743 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2744 return 0;
2745 }
2746
2747 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2748 * is locked for write. Otherwise the are possible deadlocks:
2749 * Process 1 Process 2
2750 * ext3_create() quota_sync()
2751 * journal_start() write_dquot()
2752 * dquot_initialize() down(dqio_mutex)
2753 * down(dqio_mutex) journal_start()
2754 *
2755 */
2756
2757 #ifdef CONFIG_QUOTA
2758
2759 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2760 {
2761 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2762 }
2763
2764 static int ext3_write_dquot(struct dquot *dquot)
2765 {
2766 int ret, err;
2767 handle_t *handle;
2768 struct inode *inode;
2769
2770 inode = dquot_to_inode(dquot);
2771 handle = ext3_journal_start(inode,
2772 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2773 if (IS_ERR(handle))
2774 return PTR_ERR(handle);
2775 ret = dquot_commit(dquot);
2776 err = ext3_journal_stop(handle);
2777 if (!ret)
2778 ret = err;
2779 return ret;
2780 }
2781
2782 static int ext3_acquire_dquot(struct dquot *dquot)
2783 {
2784 int ret, err;
2785 handle_t *handle;
2786
2787 handle = ext3_journal_start(dquot_to_inode(dquot),
2788 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2789 if (IS_ERR(handle))
2790 return PTR_ERR(handle);
2791 ret = dquot_acquire(dquot);
2792 err = ext3_journal_stop(handle);
2793 if (!ret)
2794 ret = err;
2795 return ret;
2796 }
2797
2798 static int ext3_release_dquot(struct dquot *dquot)
2799 {
2800 int ret, err;
2801 handle_t *handle;
2802
2803 handle = ext3_journal_start(dquot_to_inode(dquot),
2804 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2805 if (IS_ERR(handle)) {
2806 /* Release dquot anyway to avoid endless cycle in dqput() */
2807 dquot_release(dquot);
2808 return PTR_ERR(handle);
2809 }
2810 ret = dquot_release(dquot);
2811 err = ext3_journal_stop(handle);
2812 if (!ret)
2813 ret = err;
2814 return ret;
2815 }
2816
2817 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2818 {
2819 /* Are we journaling quotas? */
2820 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2821 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2822 dquot_mark_dquot_dirty(dquot);
2823 return ext3_write_dquot(dquot);
2824 } else {
2825 return dquot_mark_dquot_dirty(dquot);
2826 }
2827 }
2828
2829 static int ext3_write_info(struct super_block *sb, int type)
2830 {
2831 int ret, err;
2832 handle_t *handle;
2833
2834 /* Data block + inode block */
2835 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2836 if (IS_ERR(handle))
2837 return PTR_ERR(handle);
2838 ret = dquot_commit_info(sb, type);
2839 err = ext3_journal_stop(handle);
2840 if (!ret)
2841 ret = err;
2842 return ret;
2843 }
2844
2845 /*
2846 * Turn on quotas during mount time - we need to find
2847 * the quota file and such...
2848 */
2849 static int ext3_quota_on_mount(struct super_block *sb, int type)
2850 {
2851 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2852 EXT3_SB(sb)->s_jquota_fmt, type);
2853 }
2854
2855 /*
2856 * Standard function to be called on quota_on
2857 */
2858 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2859 char *name)
2860 {
2861 int err;
2862 struct path path;
2863
2864 if (!test_opt(sb, QUOTA))
2865 return -EINVAL;
2866
2867 err = kern_path(name, LOOKUP_FOLLOW, &path);
2868 if (err)
2869 return err;
2870
2871 /* Quotafile not on the same filesystem? */
2872 if (path.mnt->mnt_sb != sb) {
2873 path_put(&path);
2874 return -EXDEV;
2875 }
2876 /* Journaling quota? */
2877 if (EXT3_SB(sb)->s_qf_names[type]) {
2878 /* Quotafile not of fs root? */
2879 if (path.dentry->d_parent != sb->s_root)
2880 ext3_msg(sb, KERN_WARNING,
2881 "warning: Quota file not on filesystem root. "
2882 "Journaled quota will not work.");
2883 }
2884
2885 /*
2886 * When we journal data on quota file, we have to flush journal to see
2887 * all updates to the file when we bypass pagecache...
2888 */
2889 if (ext3_should_journal_data(path.dentry->d_inode)) {
2890 /*
2891 * We don't need to lock updates but journal_flush() could
2892 * otherwise be livelocked...
2893 */
2894 journal_lock_updates(EXT3_SB(sb)->s_journal);
2895 err = journal_flush(EXT3_SB(sb)->s_journal);
2896 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2897 if (err) {
2898 path_put(&path);
2899 return err;
2900 }
2901 }
2902
2903 err = dquot_quota_on_path(sb, type, format_id, &path);
2904 path_put(&path);
2905 return err;
2906 }
2907
2908 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2909 * acquiring the locks... As quota files are never truncated and quota code
2910 * itself serializes the operations (and noone else should touch the files)
2911 * we don't have to be afraid of races */
2912 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2913 size_t len, loff_t off)
2914 {
2915 struct inode *inode = sb_dqopt(sb)->files[type];
2916 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2917 int err = 0;
2918 int offset = off & (sb->s_blocksize - 1);
2919 int tocopy;
2920 size_t toread;
2921 struct buffer_head *bh;
2922 loff_t i_size = i_size_read(inode);
2923
2924 if (off > i_size)
2925 return 0;
2926 if (off+len > i_size)
2927 len = i_size-off;
2928 toread = len;
2929 while (toread > 0) {
2930 tocopy = sb->s_blocksize - offset < toread ?
2931 sb->s_blocksize - offset : toread;
2932 bh = ext3_bread(NULL, inode, blk, 0, &err);
2933 if (err)
2934 return err;
2935 if (!bh) /* A hole? */
2936 memset(data, 0, tocopy);
2937 else
2938 memcpy(data, bh->b_data+offset, tocopy);
2939 brelse(bh);
2940 offset = 0;
2941 toread -= tocopy;
2942 data += tocopy;
2943 blk++;
2944 }
2945 return len;
2946 }
2947
2948 /* Write to quotafile (we know the transaction is already started and has
2949 * enough credits) */
2950 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2951 const char *data, size_t len, loff_t off)
2952 {
2953 struct inode *inode = sb_dqopt(sb)->files[type];
2954 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2955 int err = 0;
2956 int offset = off & (sb->s_blocksize - 1);
2957 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2958 struct buffer_head *bh;
2959 handle_t *handle = journal_current_handle();
2960
2961 if (!handle) {
2962 ext3_msg(sb, KERN_WARNING,
2963 "warning: quota write (off=%llu, len=%llu)"
2964 " cancelled because transaction is not started.",
2965 (unsigned long long)off, (unsigned long long)len);
2966 return -EIO;
2967 }
2968
2969 /*
2970 * Since we account only one data block in transaction credits,
2971 * then it is impossible to cross a block boundary.
2972 */
2973 if (sb->s_blocksize - offset < len) {
2974 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
2975 " cancelled because not block aligned",
2976 (unsigned long long)off, (unsigned long long)len);
2977 return -EIO;
2978 }
2979 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2980 bh = ext3_bread(handle, inode, blk, 1, &err);
2981 if (!bh)
2982 goto out;
2983 if (journal_quota) {
2984 err = ext3_journal_get_write_access(handle, bh);
2985 if (err) {
2986 brelse(bh);
2987 goto out;
2988 }
2989 }
2990 lock_buffer(bh);
2991 memcpy(bh->b_data+offset, data, len);
2992 flush_dcache_page(bh->b_page);
2993 unlock_buffer(bh);
2994 if (journal_quota)
2995 err = ext3_journal_dirty_metadata(handle, bh);
2996 else {
2997 /* Always do at least ordered writes for quotas */
2998 err = ext3_journal_dirty_data(handle, bh);
2999 mark_buffer_dirty(bh);
3000 }
3001 brelse(bh);
3002 out:
3003 if (err) {
3004 mutex_unlock(&inode->i_mutex);
3005 return err;
3006 }
3007 if (inode->i_size < off + len) {
3008 i_size_write(inode, off + len);
3009 EXT3_I(inode)->i_disksize = inode->i_size;
3010 }
3011 inode->i_version++;
3012 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3013 ext3_mark_inode_dirty(handle, inode);
3014 mutex_unlock(&inode->i_mutex);
3015 return len;
3016 }
3017
3018 #endif
3019
3020 static int ext3_get_sb(struct file_system_type *fs_type,
3021 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3022 {
3023 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
3024 }
3025
3026 static struct file_system_type ext3_fs_type = {
3027 .owner = THIS_MODULE,
3028 .name = "ext3",
3029 .get_sb = ext3_get_sb,
3030 .kill_sb = kill_block_super,
3031 .fs_flags = FS_REQUIRES_DEV,
3032 };
3033
3034 static int __init init_ext3_fs(void)
3035 {
3036 int err = init_ext3_xattr();
3037 if (err)
3038 return err;
3039 err = init_inodecache();
3040 if (err)
3041 goto out1;
3042 err = register_filesystem(&ext3_fs_type);
3043 if (err)
3044 goto out;
3045 return 0;
3046 out:
3047 destroy_inodecache();
3048 out1:
3049 exit_ext3_xattr();
3050 return err;
3051 }
3052
3053 static void __exit exit_ext3_fs(void)
3054 {
3055 unregister_filesystem(&ext3_fs_type);
3056 destroy_inodecache();
3057 exit_ext3_xattr();
3058 }
3059
3060 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3061 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3062 MODULE_LICENSE("GPL");
3063 module_init(init_ext3_fs)
3064 module_exit(exit_ext3_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree