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ext3: Remove unnecessary quota functions
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext3 / super.c
blob41e6ae605e0bf467c97d8f1e772cc96c16fb6e68
1 /*
2 * linux/fs/ext3/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19 #include <linux/module.h>
20 #include <linux/string.h>
21 #include <linux/fs.h>
22 #include <linux/time.h>
23 #include <linux/jbd.h>
24 #include <linux/ext3_fs.h>
25 #include <linux/ext3_jbd.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/blkdev.h>
29 #include <linux/parser.h>
30 #include <linux/smp_lock.h>
31 #include <linux/buffer_head.h>
32 #include <linux/exportfs.h>
33 #include <linux/vfs.h>
34 #include <linux/random.h>
35 #include <linux/mount.h>
36 #include <linux/namei.h>
37 #include <linux/quotaops.h>
38 #include <linux/seq_file.h>
39 #include <linux/log2.h>
40
41 #include <asm/uaccess.h>
42
43 #include "xattr.h"
44 #include "acl.h"
45 #include "namei.h"
46
47 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
48 unsigned long journal_devnum);
49 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
50 unsigned int);
51 static int ext3_commit_super(struct super_block *sb,
52 struct ext3_super_block *es,
53 int sync);
54 static void ext3_mark_recovery_complete(struct super_block * sb,
55 struct ext3_super_block * es);
56 static void ext3_clear_journal_err(struct super_block * sb,
57 struct ext3_super_block * es);
58 static int ext3_sync_fs(struct super_block *sb, int wait);
59 static const char *ext3_decode_error(struct super_block * sb, int errno,
60 char nbuf[16]);
61 static int ext3_remount (struct super_block * sb, int * flags, char * data);
62 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
63 static int ext3_unfreeze(struct super_block *sb);
64 static void ext3_write_super (struct super_block * sb);
65 static int ext3_freeze(struct super_block *sb);
66
67 /*
68 * Wrappers for journal_start/end.
69 *
70 * The only special thing we need to do here is to make sure that all
71 * journal_end calls result in the superblock being marked dirty, so
72 * that sync() will call the filesystem's write_super callback if
73 * appropriate.
74 */
75 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
76 {
77 journal_t *journal;
78
79 if (sb->s_flags & MS_RDONLY)
80 return ERR_PTR(-EROFS);
81
82 /* Special case here: if the journal has aborted behind our
83 * backs (eg. EIO in the commit thread), then we still need to
84 * take the FS itself readonly cleanly. */
85 journal = EXT3_SB(sb)->s_journal;
86 if (is_journal_aborted(journal)) {
87 ext3_abort(sb, __func__,
88 "Detected aborted journal");
89 return ERR_PTR(-EROFS);
90 }
91
92 return journal_start(journal, nblocks);
93 }
94
95 /*
96 * The only special thing we need to do here is to make sure that all
97 * journal_stop calls result in the superblock being marked dirty, so
98 * that sync() will call the filesystem's write_super callback if
99 * appropriate.
100 */
101 int __ext3_journal_stop(const char *where, handle_t *handle)
102 {
103 struct super_block *sb;
104 int err;
105 int rc;
106
107 sb = handle->h_transaction->t_journal->j_private;
108 err = handle->h_err;
109 rc = journal_stop(handle);
110
111 if (!err)
112 err = rc;
113 if (err)
114 __ext3_std_error(sb, where, err);
115 return err;
116 }
117
118 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
119 struct buffer_head *bh, handle_t *handle, int err)
120 {
121 char nbuf[16];
122 const char *errstr = ext3_decode_error(NULL, err, nbuf);
123
124 if (bh)
125 BUFFER_TRACE(bh, "abort");
126
127 if (!handle->h_err)
128 handle->h_err = err;
129
130 if (is_handle_aborted(handle))
131 return;
132
133 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
134 caller, errstr, err_fn);
135
136 journal_abort_handle(handle);
137 }
138
139 /* Deal with the reporting of failure conditions on a filesystem such as
140 * inconsistencies detected or read IO failures.
141 *
142 * On ext2, we can store the error state of the filesystem in the
143 * superblock. That is not possible on ext3, because we may have other
144 * write ordering constraints on the superblock which prevent us from
145 * writing it out straight away; and given that the journal is about to
146 * be aborted, we can't rely on the current, or future, transactions to
147 * write out the superblock safely.
148 *
149 * We'll just use the journal_abort() error code to record an error in
150 * the journal instead. On recovery, the journal will compain about
151 * that error until we've noted it down and cleared it.
152 */
153
154 static void ext3_handle_error(struct super_block *sb)
155 {
156 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
157
158 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
159 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
160
161 if (sb->s_flags & MS_RDONLY)
162 return;
163
164 if (!test_opt (sb, ERRORS_CONT)) {
165 journal_t *journal = EXT3_SB(sb)->s_journal;
166
167 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
168 if (journal)
169 journal_abort(journal, -EIO);
170 }
171 if (test_opt (sb, ERRORS_RO)) {
172 printk (KERN_CRIT "Remounting filesystem read-only\n");
173 sb->s_flags |= MS_RDONLY;
174 }
175 ext3_commit_super(sb, es, 1);
176 if (test_opt(sb, ERRORS_PANIC))
177 panic("EXT3-fs (device %s): panic forced after error\n",
178 sb->s_id);
179 }
180
181 void ext3_error (struct super_block * sb, const char * function,
182 const char * fmt, ...)
183 {
184 va_list args;
185
186 va_start(args, fmt);
187 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
188 vprintk(fmt, args);
189 printk("\n");
190 va_end(args);
191
192 ext3_handle_error(sb);
193 }
194
195 static const char *ext3_decode_error(struct super_block * sb, int errno,
196 char nbuf[16])
197 {
198 char *errstr = NULL;
199
200 switch (errno) {
201 case -EIO:
202 errstr = "IO failure";
203 break;
204 case -ENOMEM:
205 errstr = "Out of memory";
206 break;
207 case -EROFS:
208 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
209 errstr = "Journal has aborted";
210 else
211 errstr = "Readonly filesystem";
212 break;
213 default:
214 /* If the caller passed in an extra buffer for unknown
215 * errors, textualise them now. Else we just return
216 * NULL. */
217 if (nbuf) {
218 /* Check for truncated error codes... */
219 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
220 errstr = nbuf;
221 }
222 break;
223 }
224
225 return errstr;
226 }
227
228 /* __ext3_std_error decodes expected errors from journaling functions
229 * automatically and invokes the appropriate error response. */
230
231 void __ext3_std_error (struct super_block * sb, const char * function,
232 int errno)
233 {
234 char nbuf[16];
235 const char *errstr;
236
237 /* Special case: if the error is EROFS, and we're not already
238 * inside a transaction, then there's really no point in logging
239 * an error. */
240 if (errno == -EROFS && journal_current_handle() == NULL &&
241 (sb->s_flags & MS_RDONLY))
242 return;
243
244 errstr = ext3_decode_error(sb, errno, nbuf);
245 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
246 sb->s_id, function, errstr);
247
248 ext3_handle_error(sb);
249 }
250
251 /*
252 * ext3_abort is a much stronger failure handler than ext3_error. The
253 * abort function may be used to deal with unrecoverable failures such
254 * as journal IO errors or ENOMEM at a critical moment in log management.
255 *
256 * We unconditionally force the filesystem into an ABORT|READONLY state,
257 * unless the error response on the fs has been set to panic in which
258 * case we take the easy way out and panic immediately.
259 */
260
261 void ext3_abort (struct super_block * sb, const char * function,
262 const char * fmt, ...)
263 {
264 va_list args;
265
266 printk (KERN_CRIT "ext3_abort called.\n");
267
268 va_start(args, fmt);
269 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
270 vprintk(fmt, args);
271 printk("\n");
272 va_end(args);
273
274 if (test_opt(sb, ERRORS_PANIC))
275 panic("EXT3-fs panic from previous error\n");
276
277 if (sb->s_flags & MS_RDONLY)
278 return;
279
280 printk(KERN_CRIT "Remounting filesystem read-only\n");
281 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
282 sb->s_flags |= MS_RDONLY;
283 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
284 if (EXT3_SB(sb)->s_journal)
285 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
286 }
287
288 void ext3_warning (struct super_block * sb, const char * function,
289 const char * fmt, ...)
290 {
291 va_list args;
292
293 va_start(args, fmt);
294 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
295 sb->s_id, function);
296 vprintk(fmt, args);
297 printk("\n");
298 va_end(args);
299 }
300
301 void ext3_update_dynamic_rev(struct super_block *sb)
302 {
303 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
304
305 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
306 return;
307
308 ext3_warning(sb, __func__,
309 "updating to rev %d because of new feature flag, "
310 "running e2fsck is recommended",
311 EXT3_DYNAMIC_REV);
312
313 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
314 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
315 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
316 /* leave es->s_feature_*compat flags alone */
317 /* es->s_uuid will be set by e2fsck if empty */
318
319 /*
320 * The rest of the superblock fields should be zero, and if not it
321 * means they are likely already in use, so leave them alone. We
322 * can leave it up to e2fsck to clean up any inconsistencies there.
323 */
324 }
325
326 /*
327 * Open the external journal device
328 */
329 static struct block_device *ext3_blkdev_get(dev_t dev)
330 {
331 struct block_device *bdev;
332 char b[BDEVNAME_SIZE];
333
334 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
335 if (IS_ERR(bdev))
336 goto fail;
337 return bdev;
338
339 fail:
340 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
341 __bdevname(dev, b), PTR_ERR(bdev));
342 return NULL;
343 }
344
345 /*
346 * Release the journal device
347 */
348 static int ext3_blkdev_put(struct block_device *bdev)
349 {
350 bd_release(bdev);
351 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
352 }
353
354 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
355 {
356 struct block_device *bdev;
357 int ret = -ENODEV;
358
359 bdev = sbi->journal_bdev;
360 if (bdev) {
361 ret = ext3_blkdev_put(bdev);
362 sbi->journal_bdev = NULL;
363 }
364 return ret;
365 }
366
367 static inline struct inode *orphan_list_entry(struct list_head *l)
368 {
369 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
370 }
371
372 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
373 {
374 struct list_head *l;
375
376 printk(KERN_ERR "sb orphan head is %d\n",
377 le32_to_cpu(sbi->s_es->s_last_orphan));
378
379 printk(KERN_ERR "sb_info orphan list:\n");
380 list_for_each(l, &sbi->s_orphan) {
381 struct inode *inode = orphan_list_entry(l);
382 printk(KERN_ERR " "
383 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
384 inode->i_sb->s_id, inode->i_ino, inode,
385 inode->i_mode, inode->i_nlink,
386 NEXT_ORPHAN(inode));
387 }
388 }
389
390 static void ext3_put_super (struct super_block * sb)
391 {
392 struct ext3_sb_info *sbi = EXT3_SB(sb);
393 struct ext3_super_block *es = sbi->s_es;
394 int i, err;
395
396 ext3_xattr_put_super(sb);
397 err = journal_destroy(sbi->s_journal);
398 sbi->s_journal = NULL;
399 if (err < 0)
400 ext3_abort(sb, __func__, "Couldn't clean up the journal");
401
402 if (!(sb->s_flags & MS_RDONLY)) {
403 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
404 es->s_state = cpu_to_le16(sbi->s_mount_state);
405 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
406 mark_buffer_dirty(sbi->s_sbh);
407 ext3_commit_super(sb, es, 1);
408 }
409
410 for (i = 0; i < sbi->s_gdb_count; i++)
411 brelse(sbi->s_group_desc[i]);
412 kfree(sbi->s_group_desc);
413 percpu_counter_destroy(&sbi->s_freeblocks_counter);
414 percpu_counter_destroy(&sbi->s_freeinodes_counter);
415 percpu_counter_destroy(&sbi->s_dirs_counter);
416 brelse(sbi->s_sbh);
417 #ifdef CONFIG_QUOTA
418 for (i = 0; i < MAXQUOTAS; i++)
419 kfree(sbi->s_qf_names[i]);
420 #endif
421
422 /* Debugging code just in case the in-memory inode orphan list
423 * isn't empty. The on-disk one can be non-empty if we've
424 * detected an error and taken the fs readonly, but the
425 * in-memory list had better be clean by this point. */
426 if (!list_empty(&sbi->s_orphan))
427 dump_orphan_list(sb, sbi);
428 J_ASSERT(list_empty(&sbi->s_orphan));
429
430 invalidate_bdev(sb->s_bdev);
431 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
432 /*
433 * Invalidate the journal device's buffers. We don't want them
434 * floating about in memory - the physical journal device may
435 * hotswapped, and it breaks the `ro-after' testing code.
436 */
437 sync_blockdev(sbi->journal_bdev);
438 invalidate_bdev(sbi->journal_bdev);
439 ext3_blkdev_remove(sbi);
440 }
441 sb->s_fs_info = NULL;
442 kfree(sbi->s_blockgroup_lock);
443 kfree(sbi);
444 return;
445 }
446
447 static struct kmem_cache *ext3_inode_cachep;
448
449 /*
450 * Called inside transaction, so use GFP_NOFS
451 */
452 static struct inode *ext3_alloc_inode(struct super_block *sb)
453 {
454 struct ext3_inode_info *ei;
455
456 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
457 if (!ei)
458 return NULL;
459 #ifdef CONFIG_EXT3_FS_POSIX_ACL
460 ei->i_acl = EXT3_ACL_NOT_CACHED;
461 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
462 #endif
463 ei->i_block_alloc_info = NULL;
464 ei->vfs_inode.i_version = 1;
465 return &ei->vfs_inode;
466 }
467
468 static void ext3_destroy_inode(struct inode *inode)
469 {
470 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
471 printk("EXT3 Inode %p: orphan list check failed!\n",
472 EXT3_I(inode));
473 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
474 EXT3_I(inode), sizeof(struct ext3_inode_info),
475 false);
476 dump_stack();
477 }
478 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
479 }
480
481 static void init_once(void *foo)
482 {
483 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
484
485 INIT_LIST_HEAD(&ei->i_orphan);
486 #ifdef CONFIG_EXT3_FS_XATTR
487 init_rwsem(&ei->xattr_sem);
488 #endif
489 mutex_init(&ei->truncate_mutex);
490 inode_init_once(&ei->vfs_inode);
491 }
492
493 static int init_inodecache(void)
494 {
495 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
496 sizeof(struct ext3_inode_info),
497 0, (SLAB_RECLAIM_ACCOUNT|
498 SLAB_MEM_SPREAD),
499 init_once);
500 if (ext3_inode_cachep == NULL)
501 return -ENOMEM;
502 return 0;
503 }
504
505 static void destroy_inodecache(void)
506 {
507 kmem_cache_destroy(ext3_inode_cachep);
508 }
509
510 static void ext3_clear_inode(struct inode *inode)
511 {
512 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
513 #ifdef CONFIG_EXT3_FS_POSIX_ACL
514 if (EXT3_I(inode)->i_acl &&
515 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
516 posix_acl_release(EXT3_I(inode)->i_acl);
517 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
518 }
519 if (EXT3_I(inode)->i_default_acl &&
520 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
521 posix_acl_release(EXT3_I(inode)->i_default_acl);
522 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
523 }
524 #endif
525 ext3_discard_reservation(inode);
526 EXT3_I(inode)->i_block_alloc_info = NULL;
527 if (unlikely(rsv))
528 kfree(rsv);
529 }
530
531 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
532 {
533 #if defined(CONFIG_QUOTA)
534 struct ext3_sb_info *sbi = EXT3_SB(sb);
535
536 if (sbi->s_jquota_fmt)
537 seq_printf(seq, ",jqfmt=%s",
538 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
539
540 if (sbi->s_qf_names[USRQUOTA])
541 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
542
543 if (sbi->s_qf_names[GRPQUOTA])
544 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
545
546 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
547 seq_puts(seq, ",usrquota");
548
549 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
550 seq_puts(seq, ",grpquota");
551 #endif
552 }
553
554 /*
555 * Show an option if
556 * - it's set to a non-default value OR
557 * - if the per-sb default is different from the global default
558 */
559 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
560 {
561 struct super_block *sb = vfs->mnt_sb;
562 struct ext3_sb_info *sbi = EXT3_SB(sb);
563 struct ext3_super_block *es = sbi->s_es;
564 unsigned long def_mount_opts;
565
566 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
567
568 if (sbi->s_sb_block != 1)
569 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
570 if (test_opt(sb, MINIX_DF))
571 seq_puts(seq, ",minixdf");
572 if (test_opt(sb, GRPID))
573 seq_puts(seq, ",grpid");
574 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
575 seq_puts(seq, ",nogrpid");
576 if (sbi->s_resuid != EXT3_DEF_RESUID ||
577 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
578 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
579 }
580 if (sbi->s_resgid != EXT3_DEF_RESGID ||
581 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
582 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
583 }
584 if (test_opt(sb, ERRORS_RO)) {
585 int def_errors = le16_to_cpu(es->s_errors);
586
587 if (def_errors == EXT3_ERRORS_PANIC ||
588 def_errors == EXT3_ERRORS_CONTINUE) {
589 seq_puts(seq, ",errors=remount-ro");
590 }
591 }
592 if (test_opt(sb, ERRORS_CONT))
593 seq_puts(seq, ",errors=continue");
594 if (test_opt(sb, ERRORS_PANIC))
595 seq_puts(seq, ",errors=panic");
596 if (test_opt(sb, NO_UID32))
597 seq_puts(seq, ",nouid32");
598 if (test_opt(sb, DEBUG))
599 seq_puts(seq, ",debug");
600 if (test_opt(sb, OLDALLOC))
601 seq_puts(seq, ",oldalloc");
602 #ifdef CONFIG_EXT3_FS_XATTR
603 if (test_opt(sb, XATTR_USER))
604 seq_puts(seq, ",user_xattr");
605 if (!test_opt(sb, XATTR_USER) &&
606 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
607 seq_puts(seq, ",nouser_xattr");
608 }
609 #endif
610 #ifdef CONFIG_EXT3_FS_POSIX_ACL
611 if (test_opt(sb, POSIX_ACL))
612 seq_puts(seq, ",acl");
613 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
614 seq_puts(seq, ",noacl");
615 #endif
616 if (!test_opt(sb, RESERVATION))
617 seq_puts(seq, ",noreservation");
618 if (sbi->s_commit_interval) {
619 seq_printf(seq, ",commit=%u",
620 (unsigned) (sbi->s_commit_interval / HZ));
621 }
622 if (test_opt(sb, BARRIER))
623 seq_puts(seq, ",barrier=1");
624 if (test_opt(sb, NOBH))
625 seq_puts(seq, ",nobh");
626
627 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
628 seq_puts(seq, ",data=journal");
629 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
630 seq_puts(seq, ",data=ordered");
631 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
632 seq_puts(seq, ",data=writeback");
633
634 if (test_opt(sb, DATA_ERR_ABORT))
635 seq_puts(seq, ",data_err=abort");
636
637 ext3_show_quota_options(seq, sb);
638
639 return 0;
640 }
641
642
643 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
644 u64 ino, u32 generation)
645 {
646 struct inode *inode;
647
648 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
649 return ERR_PTR(-ESTALE);
650 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
651 return ERR_PTR(-ESTALE);
652
653 /* iget isn't really right if the inode is currently unallocated!!
654 *
655 * ext3_read_inode will return a bad_inode if the inode had been
656 * deleted, so we should be safe.
657 *
658 * Currently we don't know the generation for parent directory, so
659 * a generation of 0 means "accept any"
660 */
661 inode = ext3_iget(sb, ino);
662 if (IS_ERR(inode))
663 return ERR_CAST(inode);
664 if (generation && inode->i_generation != generation) {
665 iput(inode);
666 return ERR_PTR(-ESTALE);
667 }
668
669 return inode;
670 }
671
672 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
673 int fh_len, int fh_type)
674 {
675 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
676 ext3_nfs_get_inode);
677 }
678
679 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
680 int fh_len, int fh_type)
681 {
682 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
683 ext3_nfs_get_inode);
684 }
685
686 /*
687 * Try to release metadata pages (indirect blocks, directories) which are
688 * mapped via the block device. Since these pages could have journal heads
689 * which would prevent try_to_free_buffers() from freeing them, we must use
690 * jbd layer's try_to_free_buffers() function to release them.
691 */
692 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
693 gfp_t wait)
694 {
695 journal_t *journal = EXT3_SB(sb)->s_journal;
696
697 WARN_ON(PageChecked(page));
698 if (!page_has_buffers(page))
699 return 0;
700 if (journal)
701 return journal_try_to_free_buffers(journal, page,
702 wait & ~__GFP_WAIT);
703 return try_to_free_buffers(page);
704 }
705
706 #ifdef CONFIG_QUOTA
707 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
708 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
709
710 static int ext3_write_dquot(struct dquot *dquot);
711 static int ext3_acquire_dquot(struct dquot *dquot);
712 static int ext3_release_dquot(struct dquot *dquot);
713 static int ext3_mark_dquot_dirty(struct dquot *dquot);
714 static int ext3_write_info(struct super_block *sb, int type);
715 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
716 char *path, int remount);
717 static int ext3_quota_on_mount(struct super_block *sb, int type);
718 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
719 size_t len, loff_t off);
720 static ssize_t ext3_quota_write(struct super_block *sb, int type,
721 const char *data, size_t len, loff_t off);
722
723 static struct dquot_operations ext3_quota_operations = {
724 .initialize = dquot_initialize,
725 .drop = dquot_drop,
726 .alloc_space = dquot_alloc_space,
727 .alloc_inode = dquot_alloc_inode,
728 .free_space = dquot_free_space,
729 .free_inode = dquot_free_inode,
730 .transfer = dquot_transfer,
731 .write_dquot = ext3_write_dquot,
732 .acquire_dquot = ext3_acquire_dquot,
733 .release_dquot = ext3_release_dquot,
734 .mark_dirty = ext3_mark_dquot_dirty,
735 .write_info = ext3_write_info,
736 .alloc_dquot = dquot_alloc,
737 .destroy_dquot = dquot_destroy,
738 };
739
740 static struct quotactl_ops ext3_qctl_operations = {
741 .quota_on = ext3_quota_on,
742 .quota_off = vfs_quota_off,
743 .quota_sync = vfs_quota_sync,
744 .get_info = vfs_get_dqinfo,
745 .set_info = vfs_set_dqinfo,
746 .get_dqblk = vfs_get_dqblk,
747 .set_dqblk = vfs_set_dqblk
748 };
749 #endif
750
751 static const struct super_operations ext3_sops = {
752 .alloc_inode = ext3_alloc_inode,
753 .destroy_inode = ext3_destroy_inode,
754 .write_inode = ext3_write_inode,
755 .dirty_inode = ext3_dirty_inode,
756 .delete_inode = ext3_delete_inode,
757 .put_super = ext3_put_super,
758 .write_super = ext3_write_super,
759 .sync_fs = ext3_sync_fs,
760 .freeze_fs = ext3_freeze,
761 .unfreeze_fs = ext3_unfreeze,
762 .statfs = ext3_statfs,
763 .remount_fs = ext3_remount,
764 .clear_inode = ext3_clear_inode,
765 .show_options = ext3_show_options,
766 #ifdef CONFIG_QUOTA
767 .quota_read = ext3_quota_read,
768 .quota_write = ext3_quota_write,
769 #endif
770 .bdev_try_to_free_page = bdev_try_to_free_page,
771 };
772
773 static const struct export_operations ext3_export_ops = {
774 .fh_to_dentry = ext3_fh_to_dentry,
775 .fh_to_parent = ext3_fh_to_parent,
776 .get_parent = ext3_get_parent,
777 };
778
779 enum {
780 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
781 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
782 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
783 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
784 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
785 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
786 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
787 Opt_data_err_abort, Opt_data_err_ignore,
788 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
789 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
790 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
791 Opt_grpquota
792 };
793
794 static const match_table_t tokens = {
795 {Opt_bsd_df, "bsddf"},
796 {Opt_minix_df, "minixdf"},
797 {Opt_grpid, "grpid"},
798 {Opt_grpid, "bsdgroups"},
799 {Opt_nogrpid, "nogrpid"},
800 {Opt_nogrpid, "sysvgroups"},
801 {Opt_resgid, "resgid=%u"},
802 {Opt_resuid, "resuid=%u"},
803 {Opt_sb, "sb=%u"},
804 {Opt_err_cont, "errors=continue"},
805 {Opt_err_panic, "errors=panic"},
806 {Opt_err_ro, "errors=remount-ro"},
807 {Opt_nouid32, "nouid32"},
808 {Opt_nocheck, "nocheck"},
809 {Opt_nocheck, "check=none"},
810 {Opt_debug, "debug"},
811 {Opt_oldalloc, "oldalloc"},
812 {Opt_orlov, "orlov"},
813 {Opt_user_xattr, "user_xattr"},
814 {Opt_nouser_xattr, "nouser_xattr"},
815 {Opt_acl, "acl"},
816 {Opt_noacl, "noacl"},
817 {Opt_reservation, "reservation"},
818 {Opt_noreservation, "noreservation"},
819 {Opt_noload, "noload"},
820 {Opt_nobh, "nobh"},
821 {Opt_bh, "bh"},
822 {Opt_commit, "commit=%u"},
823 {Opt_journal_update, "journal=update"},
824 {Opt_journal_inum, "journal=%u"},
825 {Opt_journal_dev, "journal_dev=%u"},
826 {Opt_abort, "abort"},
827 {Opt_data_journal, "data=journal"},
828 {Opt_data_ordered, "data=ordered"},
829 {Opt_data_writeback, "data=writeback"},
830 {Opt_data_err_abort, "data_err=abort"},
831 {Opt_data_err_ignore, "data_err=ignore"},
832 {Opt_offusrjquota, "usrjquota="},
833 {Opt_usrjquota, "usrjquota=%s"},
834 {Opt_offgrpjquota, "grpjquota="},
835 {Opt_grpjquota, "grpjquota=%s"},
836 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
837 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
838 {Opt_grpquota, "grpquota"},
839 {Opt_noquota, "noquota"},
840 {Opt_quota, "quota"},
841 {Opt_usrquota, "usrquota"},
842 {Opt_barrier, "barrier=%u"},
843 {Opt_resize, "resize"},
844 {Opt_err, NULL},
845 };
846
847 static ext3_fsblk_t get_sb_block(void **data)
848 {
849 ext3_fsblk_t sb_block;
850 char *options = (char *) *data;
851
852 if (!options || strncmp(options, "sb=", 3) != 0)
853 return 1; /* Default location */
854 options += 3;
855 /*todo: use simple_strtoll with >32bit ext3 */
856 sb_block = simple_strtoul(options, &options, 0);
857 if (*options && *options != ',') {
858 printk("EXT3-fs: Invalid sb specification: %s\n",
859 (char *) *data);
860 return 1;
861 }
862 if (*options == ',')
863 options++;
864 *data = (void *) options;
865 return sb_block;
866 }
867
868 static int parse_options (char *options, struct super_block *sb,
869 unsigned int *inum, unsigned long *journal_devnum,
870 ext3_fsblk_t *n_blocks_count, int is_remount)
871 {
872 struct ext3_sb_info *sbi = EXT3_SB(sb);
873 char * p;
874 substring_t args[MAX_OPT_ARGS];
875 int data_opt = 0;
876 int option;
877 #ifdef CONFIG_QUOTA
878 int qtype, qfmt;
879 char *qname;
880 #endif
881
882 if (!options)
883 return 1;
884
885 while ((p = strsep (&options, ",")) != NULL) {
886 int token;
887 if (!*p)
888 continue;
889
890 token = match_token(p, tokens, args);
891 switch (token) {
892 case Opt_bsd_df:
893 clear_opt (sbi->s_mount_opt, MINIX_DF);
894 break;
895 case Opt_minix_df:
896 set_opt (sbi->s_mount_opt, MINIX_DF);
897 break;
898 case Opt_grpid:
899 set_opt (sbi->s_mount_opt, GRPID);
900 break;
901 case Opt_nogrpid:
902 clear_opt (sbi->s_mount_opt, GRPID);
903 break;
904 case Opt_resuid:
905 if (match_int(&args[0], &option))
906 return 0;
907 sbi->s_resuid = option;
908 break;
909 case Opt_resgid:
910 if (match_int(&args[0], &option))
911 return 0;
912 sbi->s_resgid = option;
913 break;
914 case Opt_sb:
915 /* handled by get_sb_block() instead of here */
916 /* *sb_block = match_int(&args[0]); */
917 break;
918 case Opt_err_panic:
919 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
920 clear_opt (sbi->s_mount_opt, ERRORS_RO);
921 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
922 break;
923 case Opt_err_ro:
924 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
925 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
926 set_opt (sbi->s_mount_opt, ERRORS_RO);
927 break;
928 case Opt_err_cont:
929 clear_opt (sbi->s_mount_opt, ERRORS_RO);
930 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
931 set_opt (sbi->s_mount_opt, ERRORS_CONT);
932 break;
933 case Opt_nouid32:
934 set_opt (sbi->s_mount_opt, NO_UID32);
935 break;
936 case Opt_nocheck:
937 clear_opt (sbi->s_mount_opt, CHECK);
938 break;
939 case Opt_debug:
940 set_opt (sbi->s_mount_opt, DEBUG);
941 break;
942 case Opt_oldalloc:
943 set_opt (sbi->s_mount_opt, OLDALLOC);
944 break;
945 case Opt_orlov:
946 clear_opt (sbi->s_mount_opt, OLDALLOC);
947 break;
948 #ifdef CONFIG_EXT3_FS_XATTR
949 case Opt_user_xattr:
950 set_opt (sbi->s_mount_opt, XATTR_USER);
951 break;
952 case Opt_nouser_xattr:
953 clear_opt (sbi->s_mount_opt, XATTR_USER);
954 break;
955 #else
956 case Opt_user_xattr:
957 case Opt_nouser_xattr:
958 printk("EXT3 (no)user_xattr options not supported\n");
959 break;
960 #endif
961 #ifdef CONFIG_EXT3_FS_POSIX_ACL
962 case Opt_acl:
963 set_opt(sbi->s_mount_opt, POSIX_ACL);
964 break;
965 case Opt_noacl:
966 clear_opt(sbi->s_mount_opt, POSIX_ACL);
967 break;
968 #else
969 case Opt_acl:
970 case Opt_noacl:
971 printk("EXT3 (no)acl options not supported\n");
972 break;
973 #endif
974 case Opt_reservation:
975 set_opt(sbi->s_mount_opt, RESERVATION);
976 break;
977 case Opt_noreservation:
978 clear_opt(sbi->s_mount_opt, RESERVATION);
979 break;
980 case Opt_journal_update:
981 /* @@@ FIXME */
982 /* Eventually we will want to be able to create
983 a journal file here. For now, only allow the
984 user to specify an existing inode to be the
985 journal file. */
986 if (is_remount) {
987 printk(KERN_ERR "EXT3-fs: cannot specify "
988 "journal on remount\n");
989 return 0;
990 }
991 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
992 break;
993 case Opt_journal_inum:
994 if (is_remount) {
995 printk(KERN_ERR "EXT3-fs: cannot specify "
996 "journal on remount\n");
997 return 0;
998 }
999 if (match_int(&args[0], &option))
1000 return 0;
1001 *inum = option;
1002 break;
1003 case Opt_journal_dev:
1004 if (is_remount) {
1005 printk(KERN_ERR "EXT3-fs: cannot specify "
1006 "journal on remount\n");
1007 return 0;
1008 }
1009 if (match_int(&args[0], &option))
1010 return 0;
1011 *journal_devnum = option;
1012 break;
1013 case Opt_noload:
1014 set_opt (sbi->s_mount_opt, NOLOAD);
1015 break;
1016 case Opt_commit:
1017 if (match_int(&args[0], &option))
1018 return 0;
1019 if (option < 0)
1020 return 0;
1021 if (option == 0)
1022 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1023 sbi->s_commit_interval = HZ * option;
1024 break;
1025 case Opt_data_journal:
1026 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1027 goto datacheck;
1028 case Opt_data_ordered:
1029 data_opt = EXT3_MOUNT_ORDERED_DATA;
1030 goto datacheck;
1031 case Opt_data_writeback:
1032 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1033 datacheck:
1034 if (is_remount) {
1035 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1036 != data_opt) {
1037 printk(KERN_ERR
1038 "EXT3-fs: cannot change data "
1039 "mode on remount\n");
1040 return 0;
1041 }
1042 } else {
1043 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1044 sbi->s_mount_opt |= data_opt;
1045 }
1046 break;
1047 case Opt_data_err_abort:
1048 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1049 break;
1050 case Opt_data_err_ignore:
1051 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1052 break;
1053 #ifdef CONFIG_QUOTA
1054 case Opt_usrjquota:
1055 qtype = USRQUOTA;
1056 goto set_qf_name;
1057 case Opt_grpjquota:
1058 qtype = GRPQUOTA;
1059 set_qf_name:
1060 if (sb_any_quota_loaded(sb) &&
1061 !sbi->s_qf_names[qtype]) {
1062 printk(KERN_ERR
1063 "EXT3-fs: Cannot change journaled "
1064 "quota options when quota turned on.\n");
1065 return 0;
1066 }
1067 qname = match_strdup(&args[0]);
1068 if (!qname) {
1069 printk(KERN_ERR
1070 "EXT3-fs: not enough memory for "
1071 "storing quotafile name.\n");
1072 return 0;
1073 }
1074 if (sbi->s_qf_names[qtype] &&
1075 strcmp(sbi->s_qf_names[qtype], qname)) {
1076 printk(KERN_ERR
1077 "EXT3-fs: %s quota file already "
1078 "specified.\n", QTYPE2NAME(qtype));
1079 kfree(qname);
1080 return 0;
1081 }
1082 sbi->s_qf_names[qtype] = qname;
1083 if (strchr(sbi->s_qf_names[qtype], '/')) {
1084 printk(KERN_ERR
1085 "EXT3-fs: quotafile must be on "
1086 "filesystem root.\n");
1087 kfree(sbi->s_qf_names[qtype]);
1088 sbi->s_qf_names[qtype] = NULL;
1089 return 0;
1090 }
1091 set_opt(sbi->s_mount_opt, QUOTA);
1092 break;
1093 case Opt_offusrjquota:
1094 qtype = USRQUOTA;
1095 goto clear_qf_name;
1096 case Opt_offgrpjquota:
1097 qtype = GRPQUOTA;
1098 clear_qf_name:
1099 if (sb_any_quota_loaded(sb) &&
1100 sbi->s_qf_names[qtype]) {
1101 printk(KERN_ERR "EXT3-fs: Cannot change "
1102 "journaled quota options when "
1103 "quota turned on.\n");
1104 return 0;
1105 }
1106 /*
1107 * The space will be released later when all options
1108 * are confirmed to be correct
1109 */
1110 sbi->s_qf_names[qtype] = NULL;
1111 break;
1112 case Opt_jqfmt_vfsold:
1113 qfmt = QFMT_VFS_OLD;
1114 goto set_qf_format;
1115 case Opt_jqfmt_vfsv0:
1116 qfmt = QFMT_VFS_V0;
1117 set_qf_format:
1118 if (sb_any_quota_loaded(sb) &&
1119 sbi->s_jquota_fmt != qfmt) {
1120 printk(KERN_ERR "EXT3-fs: Cannot change "
1121 "journaled quota options when "
1122 "quota turned on.\n");
1123 return 0;
1124 }
1125 sbi->s_jquota_fmt = qfmt;
1126 break;
1127 case Opt_quota:
1128 case Opt_usrquota:
1129 set_opt(sbi->s_mount_opt, QUOTA);
1130 set_opt(sbi->s_mount_opt, USRQUOTA);
1131 break;
1132 case Opt_grpquota:
1133 set_opt(sbi->s_mount_opt, QUOTA);
1134 set_opt(sbi->s_mount_opt, GRPQUOTA);
1135 break;
1136 case Opt_noquota:
1137 if (sb_any_quota_loaded(sb)) {
1138 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1139 "options when quota turned on.\n");
1140 return 0;
1141 }
1142 clear_opt(sbi->s_mount_opt, QUOTA);
1143 clear_opt(sbi->s_mount_opt, USRQUOTA);
1144 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1145 break;
1146 #else
1147 case Opt_quota:
1148 case Opt_usrquota:
1149 case Opt_grpquota:
1150 printk(KERN_ERR
1151 "EXT3-fs: quota options not supported.\n");
1152 break;
1153 case Opt_usrjquota:
1154 case Opt_grpjquota:
1155 case Opt_offusrjquota:
1156 case Opt_offgrpjquota:
1157 case Opt_jqfmt_vfsold:
1158 case Opt_jqfmt_vfsv0:
1159 printk(KERN_ERR
1160 "EXT3-fs: journaled quota options not "
1161 "supported.\n");
1162 break;
1163 case Opt_noquota:
1164 break;
1165 #endif
1166 case Opt_abort:
1167 set_opt(sbi->s_mount_opt, ABORT);
1168 break;
1169 case Opt_barrier:
1170 if (match_int(&args[0], &option))
1171 return 0;
1172 if (option)
1173 set_opt(sbi->s_mount_opt, BARRIER);
1174 else
1175 clear_opt(sbi->s_mount_opt, BARRIER);
1176 break;
1177 case Opt_ignore:
1178 break;
1179 case Opt_resize:
1180 if (!is_remount) {
1181 printk("EXT3-fs: resize option only available "
1182 "for remount\n");
1183 return 0;
1184 }
1185 if (match_int(&args[0], &option) != 0)
1186 return 0;
1187 *n_blocks_count = option;
1188 break;
1189 case Opt_nobh:
1190 set_opt(sbi->s_mount_opt, NOBH);
1191 break;
1192 case Opt_bh:
1193 clear_opt(sbi->s_mount_opt, NOBH);
1194 break;
1195 default:
1196 printk (KERN_ERR
1197 "EXT3-fs: Unrecognized mount option \"%s\" "
1198 "or missing value\n", p);
1199 return 0;
1200 }
1201 }
1202 #ifdef CONFIG_QUOTA
1203 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1204 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1205 sbi->s_qf_names[USRQUOTA])
1206 clear_opt(sbi->s_mount_opt, USRQUOTA);
1207
1208 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1209 sbi->s_qf_names[GRPQUOTA])
1210 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1211
1212 if ((sbi->s_qf_names[USRQUOTA] &&
1213 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1214 (sbi->s_qf_names[GRPQUOTA] &&
1215 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1216 printk(KERN_ERR "EXT3-fs: old and new quota "
1217 "format mixing.\n");
1218 return 0;
1219 }
1220
1221 if (!sbi->s_jquota_fmt) {
1222 printk(KERN_ERR "EXT3-fs: journaled quota format "
1223 "not specified.\n");
1224 return 0;
1225 }
1226 } else {
1227 if (sbi->s_jquota_fmt) {
1228 printk(KERN_ERR "EXT3-fs: journaled quota format "
1229 "specified with no journaling "
1230 "enabled.\n");
1231 return 0;
1232 }
1233 }
1234 #endif
1235 return 1;
1236 }
1237
1238 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1239 int read_only)
1240 {
1241 struct ext3_sb_info *sbi = EXT3_SB(sb);
1242 int res = 0;
1243
1244 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1245 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1246 "forcing read-only mode\n");
1247 res = MS_RDONLY;
1248 }
1249 if (read_only)
1250 return res;
1251 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1252 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1253 "running e2fsck is recommended\n");
1254 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1255 printk (KERN_WARNING
1256 "EXT3-fs warning: mounting fs with errors, "
1257 "running e2fsck is recommended\n");
1258 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1259 le16_to_cpu(es->s_mnt_count) >=
1260 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1261 printk (KERN_WARNING
1262 "EXT3-fs warning: maximal mount count reached, "
1263 "running e2fsck is recommended\n");
1264 else if (le32_to_cpu(es->s_checkinterval) &&
1265 (le32_to_cpu(es->s_lastcheck) +
1266 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1267 printk (KERN_WARNING
1268 "EXT3-fs warning: checktime reached, "
1269 "running e2fsck is recommended\n");
1270 #if 0
1271 /* @@@ We _will_ want to clear the valid bit if we find
1272 inconsistencies, to force a fsck at reboot. But for
1273 a plain journaled filesystem we can keep it set as
1274 valid forever! :) */
1275 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1276 #endif
1277 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1278 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1279 le16_add_cpu(&es->s_mnt_count, 1);
1280 es->s_mtime = cpu_to_le32(get_seconds());
1281 ext3_update_dynamic_rev(sb);
1282 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1283
1284 ext3_commit_super(sb, es, 1);
1285 if (test_opt(sb, DEBUG))
1286 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1287 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1288 sb->s_blocksize,
1289 sbi->s_groups_count,
1290 EXT3_BLOCKS_PER_GROUP(sb),
1291 EXT3_INODES_PER_GROUP(sb),
1292 sbi->s_mount_opt);
1293
1294 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1295 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1296 char b[BDEVNAME_SIZE];
1297
1298 printk("external journal on %s\n",
1299 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1300 } else {
1301 printk("internal journal\n");
1302 }
1303 return res;
1304 }
1305
1306 /* Called at mount-time, super-block is locked */
1307 static int ext3_check_descriptors(struct super_block *sb)
1308 {
1309 struct ext3_sb_info *sbi = EXT3_SB(sb);
1310 int i;
1311
1312 ext3_debug ("Checking group descriptors");
1313
1314 for (i = 0; i < sbi->s_groups_count; i++) {
1315 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1316 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1317 ext3_fsblk_t last_block;
1318
1319 if (i == sbi->s_groups_count - 1)
1320 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1321 else
1322 last_block = first_block +
1323 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1324
1325 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1326 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1327 {
1328 ext3_error (sb, "ext3_check_descriptors",
1329 "Block bitmap for group %d"
1330 " not in group (block %lu)!",
1331 i, (unsigned long)
1332 le32_to_cpu(gdp->bg_block_bitmap));
1333 return 0;
1334 }
1335 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1336 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1337 {
1338 ext3_error (sb, "ext3_check_descriptors",
1339 "Inode bitmap for group %d"
1340 " not in group (block %lu)!",
1341 i, (unsigned long)
1342 le32_to_cpu(gdp->bg_inode_bitmap));
1343 return 0;
1344 }
1345 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1346 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1347 last_block)
1348 {
1349 ext3_error (sb, "ext3_check_descriptors",
1350 "Inode table for group %d"
1351 " not in group (block %lu)!",
1352 i, (unsigned long)
1353 le32_to_cpu(gdp->bg_inode_table));
1354 return 0;
1355 }
1356 }
1357
1358 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1359 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1360 return 1;
1361 }
1362
1363
1364 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1365 * the superblock) which were deleted from all directories, but held open by
1366 * a process at the time of a crash. We walk the list and try to delete these
1367 * inodes at recovery time (only with a read-write filesystem).
1368 *
1369 * In order to keep the orphan inode chain consistent during traversal (in
1370 * case of crash during recovery), we link each inode into the superblock
1371 * orphan list_head and handle it the same way as an inode deletion during
1372 * normal operation (which journals the operations for us).
1373 *
1374 * We only do an iget() and an iput() on each inode, which is very safe if we
1375 * accidentally point at an in-use or already deleted inode. The worst that
1376 * can happen in this case is that we get a "bit already cleared" message from
1377 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1378 * e2fsck was run on this filesystem, and it must have already done the orphan
1379 * inode cleanup for us, so we can safely abort without any further action.
1380 */
1381 static void ext3_orphan_cleanup (struct super_block * sb,
1382 struct ext3_super_block * es)
1383 {
1384 unsigned int s_flags = sb->s_flags;
1385 int nr_orphans = 0, nr_truncates = 0;
1386 #ifdef CONFIG_QUOTA
1387 int i;
1388 #endif
1389 if (!es->s_last_orphan) {
1390 jbd_debug(4, "no orphan inodes to clean up\n");
1391 return;
1392 }
1393
1394 if (bdev_read_only(sb->s_bdev)) {
1395 printk(KERN_ERR "EXT3-fs: write access "
1396 "unavailable, skipping orphan cleanup.\n");
1397 return;
1398 }
1399
1400 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1401 if (es->s_last_orphan)
1402 jbd_debug(1, "Errors on filesystem, "
1403 "clearing orphan list.\n");
1404 es->s_last_orphan = 0;
1405 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1406 return;
1407 }
1408
1409 if (s_flags & MS_RDONLY) {
1410 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1411 sb->s_id);
1412 sb->s_flags &= ~MS_RDONLY;
1413 }
1414 #ifdef CONFIG_QUOTA
1415 /* Needed for iput() to work correctly and not trash data */
1416 sb->s_flags |= MS_ACTIVE;
1417 /* Turn on quotas so that they are updated correctly */
1418 for (i = 0; i < MAXQUOTAS; i++) {
1419 if (EXT3_SB(sb)->s_qf_names[i]) {
1420 int ret = ext3_quota_on_mount(sb, i);
1421 if (ret < 0)
1422 printk(KERN_ERR
1423 "EXT3-fs: Cannot turn on journaled "
1424 "quota: error %d\n", ret);
1425 }
1426 }
1427 #endif
1428
1429 while (es->s_last_orphan) {
1430 struct inode *inode;
1431
1432 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1433 if (IS_ERR(inode)) {
1434 es->s_last_orphan = 0;
1435 break;
1436 }
1437
1438 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1439 DQUOT_INIT(inode);
1440 if (inode->i_nlink) {
1441 printk(KERN_DEBUG
1442 "%s: truncating inode %lu to %Ld bytes\n",
1443 __func__, inode->i_ino, inode->i_size);
1444 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1445 inode->i_ino, inode->i_size);
1446 ext3_truncate(inode);
1447 nr_truncates++;
1448 } else {
1449 printk(KERN_DEBUG
1450 "%s: deleting unreferenced inode %lu\n",
1451 __func__, inode->i_ino);
1452 jbd_debug(2, "deleting unreferenced inode %lu\n",
1453 inode->i_ino);
1454 nr_orphans++;
1455 }
1456 iput(inode); /* The delete magic happens here! */
1457 }
1458
1459 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1460
1461 if (nr_orphans)
1462 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1463 sb->s_id, PLURAL(nr_orphans));
1464 if (nr_truncates)
1465 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1466 sb->s_id, PLURAL(nr_truncates));
1467 #ifdef CONFIG_QUOTA
1468 /* Turn quotas off */
1469 for (i = 0; i < MAXQUOTAS; i++) {
1470 if (sb_dqopt(sb)->files[i])
1471 vfs_quota_off(sb, i, 0);
1472 }
1473 #endif
1474 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1475 }
1476
1477 /*
1478 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1479 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1480 * We need to be 1 filesystem block less than the 2^32 sector limit.
1481 */
1482 static loff_t ext3_max_size(int bits)
1483 {
1484 loff_t res = EXT3_NDIR_BLOCKS;
1485 int meta_blocks;
1486 loff_t upper_limit;
1487
1488 /* This is calculated to be the largest file size for a
1489 * dense, file such that the total number of
1490 * sectors in the file, including data and all indirect blocks,
1491 * does not exceed 2^32 -1
1492 * __u32 i_blocks representing the total number of
1493 * 512 bytes blocks of the file
1494 */
1495 upper_limit = (1LL << 32) - 1;
1496
1497 /* total blocks in file system block size */
1498 upper_limit >>= (bits - 9);
1499
1500
1501 /* indirect blocks */
1502 meta_blocks = 1;
1503 /* double indirect blocks */
1504 meta_blocks += 1 + (1LL << (bits-2));
1505 /* tripple indirect blocks */
1506 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1507
1508 upper_limit -= meta_blocks;
1509 upper_limit <<= bits;
1510
1511 res += 1LL << (bits-2);
1512 res += 1LL << (2*(bits-2));
1513 res += 1LL << (3*(bits-2));
1514 res <<= bits;
1515 if (res > upper_limit)
1516 res = upper_limit;
1517
1518 if (res > MAX_LFS_FILESIZE)
1519 res = MAX_LFS_FILESIZE;
1520
1521 return res;
1522 }
1523
1524 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1525 ext3_fsblk_t logic_sb_block,
1526 int nr)
1527 {
1528 struct ext3_sb_info *sbi = EXT3_SB(sb);
1529 unsigned long bg, first_meta_bg;
1530 int has_super = 0;
1531
1532 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1533
1534 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1535 nr < first_meta_bg)
1536 return (logic_sb_block + nr + 1);
1537 bg = sbi->s_desc_per_block * nr;
1538 if (ext3_bg_has_super(sb, bg))
1539 has_super = 1;
1540 return (has_super + ext3_group_first_block_no(sb, bg));
1541 }
1542
1543
1544 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1545 {
1546 struct buffer_head * bh;
1547 struct ext3_super_block *es = NULL;
1548 struct ext3_sb_info *sbi;
1549 ext3_fsblk_t block;
1550 ext3_fsblk_t sb_block = get_sb_block(&data);
1551 ext3_fsblk_t logic_sb_block;
1552 unsigned long offset = 0;
1553 unsigned int journal_inum = 0;
1554 unsigned long journal_devnum = 0;
1555 unsigned long def_mount_opts;
1556 struct inode *root;
1557 int blocksize;
1558 int hblock;
1559 int db_count;
1560 int i;
1561 int needs_recovery;
1562 int ret = -EINVAL;
1563 __le32 features;
1564 int err;
1565
1566 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1567 if (!sbi)
1568 return -ENOMEM;
1569
1570 sbi->s_blockgroup_lock =
1571 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1572 if (!sbi->s_blockgroup_lock) {
1573 kfree(sbi);
1574 return -ENOMEM;
1575 }
1576 sb->s_fs_info = sbi;
1577 sbi->s_mount_opt = 0;
1578 sbi->s_resuid = EXT3_DEF_RESUID;
1579 sbi->s_resgid = EXT3_DEF_RESGID;
1580 sbi->s_sb_block = sb_block;
1581
1582 unlock_kernel();
1583
1584 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1585 if (!blocksize) {
1586 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1587 goto out_fail;
1588 }
1589
1590 /*
1591 * The ext3 superblock will not be buffer aligned for other than 1kB
1592 * block sizes. We need to calculate the offset from buffer start.
1593 */
1594 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1595 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1596 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1597 } else {
1598 logic_sb_block = sb_block;
1599 }
1600
1601 if (!(bh = sb_bread(sb, logic_sb_block))) {
1602 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1603 goto out_fail;
1604 }
1605 /*
1606 * Note: s_es must be initialized as soon as possible because
1607 * some ext3 macro-instructions depend on its value
1608 */
1609 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1610 sbi->s_es = es;
1611 sb->s_magic = le16_to_cpu(es->s_magic);
1612 if (sb->s_magic != EXT3_SUPER_MAGIC)
1613 goto cantfind_ext3;
1614
1615 /* Set defaults before we parse the mount options */
1616 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1617 if (def_mount_opts & EXT3_DEFM_DEBUG)
1618 set_opt(sbi->s_mount_opt, DEBUG);
1619 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1620 set_opt(sbi->s_mount_opt, GRPID);
1621 if (def_mount_opts & EXT3_DEFM_UID16)
1622 set_opt(sbi->s_mount_opt, NO_UID32);
1623 #ifdef CONFIG_EXT3_FS_XATTR
1624 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1625 set_opt(sbi->s_mount_opt, XATTR_USER);
1626 #endif
1627 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1628 if (def_mount_opts & EXT3_DEFM_ACL)
1629 set_opt(sbi->s_mount_opt, POSIX_ACL);
1630 #endif
1631 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1632 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1633 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1634 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1635 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1636 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1637
1638 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1639 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1640 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1641 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1642 else
1643 set_opt(sbi->s_mount_opt, ERRORS_RO);
1644
1645 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1646 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1647
1648 set_opt(sbi->s_mount_opt, RESERVATION);
1649
1650 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1651 NULL, 0))
1652 goto failed_mount;
1653
1654 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1655 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1656
1657 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1658 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1659 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1660 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1661 printk(KERN_WARNING
1662 "EXT3-fs warning: feature flags set on rev 0 fs, "
1663 "running e2fsck is recommended\n");
1664 /*
1665 * Check feature flags regardless of the revision level, since we
1666 * previously didn't change the revision level when setting the flags,
1667 * so there is a chance incompat flags are set on a rev 0 filesystem.
1668 */
1669 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1670 if (features) {
1671 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1672 "unsupported optional features (%x).\n",
1673 sb->s_id, le32_to_cpu(features));
1674 goto failed_mount;
1675 }
1676 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1677 if (!(sb->s_flags & MS_RDONLY) && features) {
1678 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1679 "unsupported optional features (%x).\n",
1680 sb->s_id, le32_to_cpu(features));
1681 goto failed_mount;
1682 }
1683 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1684
1685 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1686 blocksize > EXT3_MAX_BLOCK_SIZE) {
1687 printk(KERN_ERR
1688 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1689 blocksize, sb->s_id);
1690 goto failed_mount;
1691 }
1692
1693 hblock = bdev_hardsect_size(sb->s_bdev);
1694 if (sb->s_blocksize != blocksize) {
1695 /*
1696 * Make sure the blocksize for the filesystem is larger
1697 * than the hardware sectorsize for the machine.
1698 */
1699 if (blocksize < hblock) {
1700 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1701 "device blocksize %d.\n", blocksize, hblock);
1702 goto failed_mount;
1703 }
1704
1705 brelse (bh);
1706 if (!sb_set_blocksize(sb, blocksize)) {
1707 printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1708 blocksize);
1709 goto out_fail;
1710 }
1711 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1712 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1713 bh = sb_bread(sb, logic_sb_block);
1714 if (!bh) {
1715 printk(KERN_ERR
1716 "EXT3-fs: Can't read superblock on 2nd try.\n");
1717 goto failed_mount;
1718 }
1719 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1720 sbi->s_es = es;
1721 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1722 printk (KERN_ERR
1723 "EXT3-fs: Magic mismatch, very weird !\n");
1724 goto failed_mount;
1725 }
1726 }
1727
1728 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1729
1730 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1731 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1732 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1733 } else {
1734 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1735 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1736 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1737 (!is_power_of_2(sbi->s_inode_size)) ||
1738 (sbi->s_inode_size > blocksize)) {
1739 printk (KERN_ERR
1740 "EXT3-fs: unsupported inode size: %d\n",
1741 sbi->s_inode_size);
1742 goto failed_mount;
1743 }
1744 }
1745 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1746 le32_to_cpu(es->s_log_frag_size);
1747 if (blocksize != sbi->s_frag_size) {
1748 printk(KERN_ERR
1749 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1750 sbi->s_frag_size, blocksize);
1751 goto failed_mount;
1752 }
1753 sbi->s_frags_per_block = 1;
1754 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1755 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1756 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1757 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1758 goto cantfind_ext3;
1759 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1760 if (sbi->s_inodes_per_block == 0)
1761 goto cantfind_ext3;
1762 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1763 sbi->s_inodes_per_block;
1764 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1765 sbi->s_sbh = bh;
1766 sbi->s_mount_state = le16_to_cpu(es->s_state);
1767 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1768 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1769 for (i=0; i < 4; i++)
1770 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1771 sbi->s_def_hash_version = es->s_def_hash_version;
1772 i = le32_to_cpu(es->s_flags);
1773 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1774 sbi->s_hash_unsigned = 3;
1775 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1776 #ifdef __CHAR_UNSIGNED__
1777 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1778 sbi->s_hash_unsigned = 3;
1779 #else
1780 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1781 #endif
1782 sb->s_dirt = 1;
1783 }
1784
1785 if (sbi->s_blocks_per_group > blocksize * 8) {
1786 printk (KERN_ERR
1787 "EXT3-fs: #blocks per group too big: %lu\n",
1788 sbi->s_blocks_per_group);
1789 goto failed_mount;
1790 }
1791 if (sbi->s_frags_per_group > blocksize * 8) {
1792 printk (KERN_ERR
1793 "EXT3-fs: #fragments per group too big: %lu\n",
1794 sbi->s_frags_per_group);
1795 goto failed_mount;
1796 }
1797 if (sbi->s_inodes_per_group > blocksize * 8) {
1798 printk (KERN_ERR
1799 "EXT3-fs: #inodes per group too big: %lu\n",
1800 sbi->s_inodes_per_group);
1801 goto failed_mount;
1802 }
1803
1804 if (le32_to_cpu(es->s_blocks_count) >
1805 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1806 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1807 " too large to mount safely\n", sb->s_id);
1808 if (sizeof(sector_t) < 8)
1809 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1810 "enabled\n");
1811 goto failed_mount;
1812 }
1813
1814 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1815 goto cantfind_ext3;
1816 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1817 le32_to_cpu(es->s_first_data_block) - 1)
1818 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1819 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1820 EXT3_DESC_PER_BLOCK(sb);
1821 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1822 GFP_KERNEL);
1823 if (sbi->s_group_desc == NULL) {
1824 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1825 goto failed_mount;
1826 }
1827
1828 bgl_lock_init(sbi->s_blockgroup_lock);
1829
1830 for (i = 0; i < db_count; i++) {
1831 block = descriptor_loc(sb, logic_sb_block, i);
1832 sbi->s_group_desc[i] = sb_bread(sb, block);
1833 if (!sbi->s_group_desc[i]) {
1834 printk (KERN_ERR "EXT3-fs: "
1835 "can't read group descriptor %d\n", i);
1836 db_count = i;
1837 goto failed_mount2;
1838 }
1839 }
1840 if (!ext3_check_descriptors (sb)) {
1841 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1842 goto failed_mount2;
1843 }
1844 sbi->s_gdb_count = db_count;
1845 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1846 spin_lock_init(&sbi->s_next_gen_lock);
1847
1848 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1849 ext3_count_free_blocks(sb));
1850 if (!err) {
1851 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1852 ext3_count_free_inodes(sb));
1853 }
1854 if (!err) {
1855 err = percpu_counter_init(&sbi->s_dirs_counter,
1856 ext3_count_dirs(sb));
1857 }
1858 if (err) {
1859 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1860 goto failed_mount3;
1861 }
1862
1863 /* per fileystem reservation list head & lock */
1864 spin_lock_init(&sbi->s_rsv_window_lock);
1865 sbi->s_rsv_window_root = RB_ROOT;
1866 /* Add a single, static dummy reservation to the start of the
1867 * reservation window list --- it gives us a placeholder for
1868 * append-at-start-of-list which makes the allocation logic
1869 * _much_ simpler. */
1870 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1871 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1872 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1873 sbi->s_rsv_window_head.rsv_goal_size = 0;
1874 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1875
1876 /*
1877 * set up enough so that it can read an inode
1878 */
1879 sb->s_op = &ext3_sops;
1880 sb->s_export_op = &ext3_export_ops;
1881 sb->s_xattr = ext3_xattr_handlers;
1882 #ifdef CONFIG_QUOTA
1883 sb->s_qcop = &ext3_qctl_operations;
1884 sb->dq_op = &ext3_quota_operations;
1885 #endif
1886 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1887
1888 sb->s_root = NULL;
1889
1890 needs_recovery = (es->s_last_orphan != 0 ||
1891 EXT3_HAS_INCOMPAT_FEATURE(sb,
1892 EXT3_FEATURE_INCOMPAT_RECOVER));
1893
1894 /*
1895 * The first inode we look at is the journal inode. Don't try
1896 * root first: it may be modified in the journal!
1897 */
1898 if (!test_opt(sb, NOLOAD) &&
1899 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1900 if (ext3_load_journal(sb, es, journal_devnum))
1901 goto failed_mount3;
1902 } else if (journal_inum) {
1903 if (ext3_create_journal(sb, es, journal_inum))
1904 goto failed_mount3;
1905 } else {
1906 if (!silent)
1907 printk (KERN_ERR
1908 "ext3: No journal on filesystem on %s\n",
1909 sb->s_id);
1910 goto failed_mount3;
1911 }
1912
1913 /* We have now updated the journal if required, so we can
1914 * validate the data journaling mode. */
1915 switch (test_opt(sb, DATA_FLAGS)) {
1916 case 0:
1917 /* No mode set, assume a default based on the journal
1918 capabilities: ORDERED_DATA if the journal can
1919 cope, else JOURNAL_DATA */
1920 if (journal_check_available_features
1921 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1922 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1923 else
1924 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1925 break;
1926
1927 case EXT3_MOUNT_ORDERED_DATA:
1928 case EXT3_MOUNT_WRITEBACK_DATA:
1929 if (!journal_check_available_features
1930 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1931 printk(KERN_ERR "EXT3-fs: Journal does not support "
1932 "requested data journaling mode\n");
1933 goto failed_mount4;
1934 }
1935 default:
1936 break;
1937 }
1938
1939 if (test_opt(sb, NOBH)) {
1940 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1941 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1942 "its supported only with writeback mode\n");
1943 clear_opt(sbi->s_mount_opt, NOBH);
1944 }
1945 }
1946 /*
1947 * The journal_load will have done any necessary log recovery,
1948 * so we can safely mount the rest of the filesystem now.
1949 */
1950
1951 root = ext3_iget(sb, EXT3_ROOT_INO);
1952 if (IS_ERR(root)) {
1953 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1954 ret = PTR_ERR(root);
1955 goto failed_mount4;
1956 }
1957 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1958 iput(root);
1959 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1960 goto failed_mount4;
1961 }
1962 sb->s_root = d_alloc_root(root);
1963 if (!sb->s_root) {
1964 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1965 iput(root);
1966 ret = -ENOMEM;
1967 goto failed_mount4;
1968 }
1969
1970 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1971 /*
1972 * akpm: core read_super() calls in here with the superblock locked.
1973 * That deadlocks, because orphan cleanup needs to lock the superblock
1974 * in numerous places. Here we just pop the lock - it's relatively
1975 * harmless, because we are now ready to accept write_super() requests,
1976 * and aviro says that's the only reason for hanging onto the
1977 * superblock lock.
1978 */
1979 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1980 ext3_orphan_cleanup(sb, es);
1981 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1982 if (needs_recovery)
1983 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1984 ext3_mark_recovery_complete(sb, es);
1985 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1986 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1987 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1988 "writeback");
1989
1990 lock_kernel();
1991 return 0;
1992
1993 cantfind_ext3:
1994 if (!silent)
1995 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1996 sb->s_id);
1997 goto failed_mount;
1998
1999 failed_mount4:
2000 journal_destroy(sbi->s_journal);
2001 failed_mount3:
2002 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2003 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2004 percpu_counter_destroy(&sbi->s_dirs_counter);
2005 failed_mount2:
2006 for (i = 0; i < db_count; i++)
2007 brelse(sbi->s_group_desc[i]);
2008 kfree(sbi->s_group_desc);
2009 failed_mount:
2010 #ifdef CONFIG_QUOTA
2011 for (i = 0; i < MAXQUOTAS; i++)
2012 kfree(sbi->s_qf_names[i]);
2013 #endif
2014 ext3_blkdev_remove(sbi);
2015 brelse(bh);
2016 out_fail:
2017 sb->s_fs_info = NULL;
2018 kfree(sbi);
2019 lock_kernel();
2020 return ret;
2021 }
2022
2023 /*
2024 * Setup any per-fs journal parameters now. We'll do this both on
2025 * initial mount, once the journal has been initialised but before we've
2026 * done any recovery; and again on any subsequent remount.
2027 */
2028 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2029 {
2030 struct ext3_sb_info *sbi = EXT3_SB(sb);
2031
2032 if (sbi->s_commit_interval)
2033 journal->j_commit_interval = sbi->s_commit_interval;
2034 /* We could also set up an ext3-specific default for the commit
2035 * interval here, but for now we'll just fall back to the jbd
2036 * default. */
2037
2038 spin_lock(&journal->j_state_lock);
2039 if (test_opt(sb, BARRIER))
2040 journal->j_flags |= JFS_BARRIER;
2041 else
2042 journal->j_flags &= ~JFS_BARRIER;
2043 if (test_opt(sb, DATA_ERR_ABORT))
2044 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2045 else
2046 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2047 spin_unlock(&journal->j_state_lock);
2048 }
2049
2050 static journal_t *ext3_get_journal(struct super_block *sb,
2051 unsigned int journal_inum)
2052 {
2053 struct inode *journal_inode;
2054 journal_t *journal;
2055
2056 /* First, test for the existence of a valid inode on disk. Bad
2057 * things happen if we iget() an unused inode, as the subsequent
2058 * iput() will try to delete it. */
2059
2060 journal_inode = ext3_iget(sb, journal_inum);
2061 if (IS_ERR(journal_inode)) {
2062 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2063 return NULL;
2064 }
2065 if (!journal_inode->i_nlink) {
2066 make_bad_inode(journal_inode);
2067 iput(journal_inode);
2068 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2069 return NULL;
2070 }
2071
2072 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2073 journal_inode, journal_inode->i_size);
2074 if (!S_ISREG(journal_inode->i_mode)) {
2075 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2076 iput(journal_inode);
2077 return NULL;
2078 }
2079
2080 journal = journal_init_inode(journal_inode);
2081 if (!journal) {
2082 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2083 iput(journal_inode);
2084 return NULL;
2085 }
2086 journal->j_private = sb;
2087 ext3_init_journal_params(sb, journal);
2088 return journal;
2089 }
2090
2091 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2092 dev_t j_dev)
2093 {
2094 struct buffer_head * bh;
2095 journal_t *journal;
2096 ext3_fsblk_t start;
2097 ext3_fsblk_t len;
2098 int hblock, blocksize;
2099 ext3_fsblk_t sb_block;
2100 unsigned long offset;
2101 struct ext3_super_block * es;
2102 struct block_device *bdev;
2103
2104 bdev = ext3_blkdev_get(j_dev);
2105 if (bdev == NULL)
2106 return NULL;
2107
2108 if (bd_claim(bdev, sb)) {
2109 printk(KERN_ERR
2110 "EXT3: failed to claim external journal device.\n");
2111 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2112 return NULL;
2113 }
2114
2115 blocksize = sb->s_blocksize;
2116 hblock = bdev_hardsect_size(bdev);
2117 if (blocksize < hblock) {
2118 printk(KERN_ERR
2119 "EXT3-fs: blocksize too small for journal device.\n");
2120 goto out_bdev;
2121 }
2122
2123 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2124 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2125 set_blocksize(bdev, blocksize);
2126 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2127 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2128 "external journal\n");
2129 goto out_bdev;
2130 }
2131
2132 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2133 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2134 !(le32_to_cpu(es->s_feature_incompat) &
2135 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2136 printk(KERN_ERR "EXT3-fs: external journal has "
2137 "bad superblock\n");
2138 brelse(bh);
2139 goto out_bdev;
2140 }
2141
2142 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2143 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2144 brelse(bh);
2145 goto out_bdev;
2146 }
2147
2148 len = le32_to_cpu(es->s_blocks_count);
2149 start = sb_block + 1;
2150 brelse(bh); /* we're done with the superblock */
2151
2152 journal = journal_init_dev(bdev, sb->s_bdev,
2153 start, len, blocksize);
2154 if (!journal) {
2155 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2156 goto out_bdev;
2157 }
2158 journal->j_private = sb;
2159 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2160 wait_on_buffer(journal->j_sb_buffer);
2161 if (!buffer_uptodate(journal->j_sb_buffer)) {
2162 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2163 goto out_journal;
2164 }
2165 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2166 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2167 "user (unsupported) - %d\n",
2168 be32_to_cpu(journal->j_superblock->s_nr_users));
2169 goto out_journal;
2170 }
2171 EXT3_SB(sb)->journal_bdev = bdev;
2172 ext3_init_journal_params(sb, journal);
2173 return journal;
2174 out_journal:
2175 journal_destroy(journal);
2176 out_bdev:
2177 ext3_blkdev_put(bdev);
2178 return NULL;
2179 }
2180
2181 static int ext3_load_journal(struct super_block *sb,
2182 struct ext3_super_block *es,
2183 unsigned long journal_devnum)
2184 {
2185 journal_t *journal;
2186 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2187 dev_t journal_dev;
2188 int err = 0;
2189 int really_read_only;
2190
2191 if (journal_devnum &&
2192 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2193 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2194 "numbers have changed\n");
2195 journal_dev = new_decode_dev(journal_devnum);
2196 } else
2197 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2198
2199 really_read_only = bdev_read_only(sb->s_bdev);
2200
2201 /*
2202 * Are we loading a blank journal or performing recovery after a
2203 * crash? For recovery, we need to check in advance whether we
2204 * can get read-write access to the device.
2205 */
2206
2207 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2208 if (sb->s_flags & MS_RDONLY) {
2209 printk(KERN_INFO "EXT3-fs: INFO: recovery "
2210 "required on readonly filesystem.\n");
2211 if (really_read_only) {
2212 printk(KERN_ERR "EXT3-fs: write access "
2213 "unavailable, cannot proceed.\n");
2214 return -EROFS;
2215 }
2216 printk (KERN_INFO "EXT3-fs: write access will "
2217 "be enabled during recovery.\n");
2218 }
2219 }
2220
2221 if (journal_inum && journal_dev) {
2222 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2223 "and inode journals!\n");
2224 return -EINVAL;
2225 }
2226
2227 if (journal_inum) {
2228 if (!(journal = ext3_get_journal(sb, journal_inum)))
2229 return -EINVAL;
2230 } else {
2231 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2232 return -EINVAL;
2233 }
2234
2235 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2236 err = journal_update_format(journal);
2237 if (err) {
2238 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2239 journal_destroy(journal);
2240 return err;
2241 }
2242 }
2243
2244 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2245 err = journal_wipe(journal, !really_read_only);
2246 if (!err)
2247 err = journal_load(journal);
2248
2249 if (err) {
2250 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2251 journal_destroy(journal);
2252 return err;
2253 }
2254
2255 EXT3_SB(sb)->s_journal = journal;
2256 ext3_clear_journal_err(sb, es);
2257
2258 if (journal_devnum &&
2259 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2260 es->s_journal_dev = cpu_to_le32(journal_devnum);
2261 sb->s_dirt = 1;
2262
2263 /* Make sure we flush the recovery flag to disk. */
2264 ext3_commit_super(sb, es, 1);
2265 }
2266
2267 return 0;
2268 }
2269
2270 static int ext3_create_journal(struct super_block * sb,
2271 struct ext3_super_block * es,
2272 unsigned int journal_inum)
2273 {
2274 journal_t *journal;
2275 int err;
2276
2277 if (sb->s_flags & MS_RDONLY) {
2278 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2279 "create journal.\n");
2280 return -EROFS;
2281 }
2282
2283 journal = ext3_get_journal(sb, journal_inum);
2284 if (!journal)
2285 return -EINVAL;
2286
2287 printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2288 journal_inum);
2289
2290 err = journal_create(journal);
2291 if (err) {
2292 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2293 journal_destroy(journal);
2294 return -EIO;
2295 }
2296
2297 EXT3_SB(sb)->s_journal = journal;
2298
2299 ext3_update_dynamic_rev(sb);
2300 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2301 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2302
2303 es->s_journal_inum = cpu_to_le32(journal_inum);
2304 sb->s_dirt = 1;
2305
2306 /* Make sure we flush the recovery flag to disk. */
2307 ext3_commit_super(sb, es, 1);
2308
2309 return 0;
2310 }
2311
2312 static int ext3_commit_super(struct super_block *sb,
2313 struct ext3_super_block *es,
2314 int sync)
2315 {
2316 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2317 int error = 0;
2318
2319 if (!sbh)
2320 return error;
2321 es->s_wtime = cpu_to_le32(get_seconds());
2322 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2323 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2324 BUFFER_TRACE(sbh, "marking dirty");
2325 mark_buffer_dirty(sbh);
2326 if (sync)
2327 error = sync_dirty_buffer(sbh);
2328 return error;
2329 }
2330
2331
2332 /*
2333 * Have we just finished recovery? If so, and if we are mounting (or
2334 * remounting) the filesystem readonly, then we will end up with a
2335 * consistent fs on disk. Record that fact.
2336 */
2337 static void ext3_mark_recovery_complete(struct super_block * sb,
2338 struct ext3_super_block * es)
2339 {
2340 journal_t *journal = EXT3_SB(sb)->s_journal;
2341
2342 journal_lock_updates(journal);
2343 if (journal_flush(journal) < 0)
2344 goto out;
2345
2346 lock_super(sb);
2347 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2348 sb->s_flags & MS_RDONLY) {
2349 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2350 sb->s_dirt = 0;
2351 ext3_commit_super(sb, es, 1);
2352 }
2353 unlock_super(sb);
2354
2355 out:
2356 journal_unlock_updates(journal);
2357 }
2358
2359 /*
2360 * If we are mounting (or read-write remounting) a filesystem whose journal
2361 * has recorded an error from a previous lifetime, move that error to the
2362 * main filesystem now.
2363 */
2364 static void ext3_clear_journal_err(struct super_block * sb,
2365 struct ext3_super_block * es)
2366 {
2367 journal_t *journal;
2368 int j_errno;
2369 const char *errstr;
2370
2371 journal = EXT3_SB(sb)->s_journal;
2372
2373 /*
2374 * Now check for any error status which may have been recorded in the
2375 * journal by a prior ext3_error() or ext3_abort()
2376 */
2377
2378 j_errno = journal_errno(journal);
2379 if (j_errno) {
2380 char nbuf[16];
2381
2382 errstr = ext3_decode_error(sb, j_errno, nbuf);
2383 ext3_warning(sb, __func__, "Filesystem error recorded "
2384 "from previous mount: %s", errstr);
2385 ext3_warning(sb, __func__, "Marking fs in need of "
2386 "filesystem check.");
2387
2388 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2389 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2390 ext3_commit_super (sb, es, 1);
2391
2392 journal_clear_err(journal);
2393 }
2394 }
2395
2396 /*
2397 * Force the running and committing transactions to commit,
2398 * and wait on the commit.
2399 */
2400 int ext3_force_commit(struct super_block *sb)
2401 {
2402 journal_t *journal;
2403 int ret;
2404
2405 if (sb->s_flags & MS_RDONLY)
2406 return 0;
2407
2408 journal = EXT3_SB(sb)->s_journal;
2409 sb->s_dirt = 0;
2410 ret = ext3_journal_force_commit(journal);
2411 return ret;
2412 }
2413
2414 /*
2415 * Ext3 always journals updates to the superblock itself, so we don't
2416 * have to propagate any other updates to the superblock on disk at this
2417 * point. (We can probably nuke this function altogether, and remove
2418 * any mention to sb->s_dirt in all of fs/ext3; eventual cleanup...)
2419 */
2420 static void ext3_write_super (struct super_block * sb)
2421 {
2422 if (mutex_trylock(&sb->s_lock) != 0)
2423 BUG();
2424 sb->s_dirt = 0;
2425 }
2426
2427 static int ext3_sync_fs(struct super_block *sb, int wait)
2428 {
2429 tid_t target;
2430
2431 sb->s_dirt = 0;
2432 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2433 if (wait)
2434 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2435 }
2436 return 0;
2437 }
2438
2439 /*
2440 * LVM calls this function before a (read-only) snapshot is created. This
2441 * gives us a chance to flush the journal completely and mark the fs clean.
2442 */
2443 static int ext3_freeze(struct super_block *sb)
2444 {
2445 int error = 0;
2446 journal_t *journal;
2447 sb->s_dirt = 0;
2448
2449 if (!(sb->s_flags & MS_RDONLY)) {
2450 journal = EXT3_SB(sb)->s_journal;
2451
2452 /* Now we set up the journal barrier. */
2453 journal_lock_updates(journal);
2454
2455 /*
2456 * We don't want to clear needs_recovery flag when we failed
2457 * to flush the journal.
2458 */
2459 error = journal_flush(journal);
2460 if (error < 0)
2461 goto out;
2462
2463 /* Journal blocked and flushed, clear needs_recovery flag. */
2464 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2465 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2466 if (error)
2467 goto out;
2468 }
2469 return 0;
2470
2471 out:
2472 journal_unlock_updates(journal);
2473 return error;
2474 }
2475
2476 /*
2477 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2478 * flag here, even though the filesystem is not technically dirty yet.
2479 */
2480 static int ext3_unfreeze(struct super_block *sb)
2481 {
2482 if (!(sb->s_flags & MS_RDONLY)) {
2483 lock_super(sb);
2484 /* Reser the needs_recovery flag before the fs is unlocked. */
2485 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2486 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2487 unlock_super(sb);
2488 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2489 }
2490 return 0;
2491 }
2492
2493 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2494 {
2495 struct ext3_super_block * es;
2496 struct ext3_sb_info *sbi = EXT3_SB(sb);
2497 ext3_fsblk_t n_blocks_count = 0;
2498 unsigned long old_sb_flags;
2499 struct ext3_mount_options old_opts;
2500 int err;
2501 #ifdef CONFIG_QUOTA
2502 int i;
2503 #endif
2504
2505 /* Store the original options */
2506 old_sb_flags = sb->s_flags;
2507 old_opts.s_mount_opt = sbi->s_mount_opt;
2508 old_opts.s_resuid = sbi->s_resuid;
2509 old_opts.s_resgid = sbi->s_resgid;
2510 old_opts.s_commit_interval = sbi->s_commit_interval;
2511 #ifdef CONFIG_QUOTA
2512 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2513 for (i = 0; i < MAXQUOTAS; i++)
2514 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2515 #endif
2516
2517 /*
2518 * Allow the "check" option to be passed as a remount option.
2519 */
2520 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2521 err = -EINVAL;
2522 goto restore_opts;
2523 }
2524
2525 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2526 ext3_abort(sb, __func__, "Abort forced by user");
2527
2528 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2529 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2530
2531 es = sbi->s_es;
2532
2533 ext3_init_journal_params(sb, sbi->s_journal);
2534
2535 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2536 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2537 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2538 err = -EROFS;
2539 goto restore_opts;
2540 }
2541
2542 if (*flags & MS_RDONLY) {
2543 /*
2544 * First of all, the unconditional stuff we have to do
2545 * to disable replay of the journal when we next remount
2546 */
2547 sb->s_flags |= MS_RDONLY;
2548
2549 /*
2550 * OK, test if we are remounting a valid rw partition
2551 * readonly, and if so set the rdonly flag and then
2552 * mark the partition as valid again.
2553 */
2554 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2555 (sbi->s_mount_state & EXT3_VALID_FS))
2556 es->s_state = cpu_to_le16(sbi->s_mount_state);
2557
2558 /*
2559 * We have to unlock super so that we can wait for
2560 * transactions.
2561 */
2562 unlock_super(sb);
2563 ext3_mark_recovery_complete(sb, es);
2564 lock_super(sb);
2565 } else {
2566 __le32 ret;
2567 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2568 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2569 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2570 "remount RDWR because of unsupported "
2571 "optional features (%x).\n",
2572 sb->s_id, le32_to_cpu(ret));
2573 err = -EROFS;
2574 goto restore_opts;
2575 }
2576
2577 /*
2578 * If we have an unprocessed orphan list hanging
2579 * around from a previously readonly bdev mount,
2580 * require a full umount/remount for now.
2581 */
2582 if (es->s_last_orphan) {
2583 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2584 "remount RDWR because of unprocessed "
2585 "orphan inode list. Please "
2586 "umount/remount instead.\n",
2587 sb->s_id);
2588 err = -EINVAL;
2589 goto restore_opts;
2590 }
2591
2592 /*
2593 * Mounting a RDONLY partition read-write, so reread
2594 * and store the current valid flag. (It may have
2595 * been changed by e2fsck since we originally mounted
2596 * the partition.)
2597 */
2598 ext3_clear_journal_err(sb, es);
2599 sbi->s_mount_state = le16_to_cpu(es->s_state);
2600 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2601 goto restore_opts;
2602 if (!ext3_setup_super (sb, es, 0))
2603 sb->s_flags &= ~MS_RDONLY;
2604 }
2605 }
2606 #ifdef CONFIG_QUOTA
2607 /* Release old quota file names */
2608 for (i = 0; i < MAXQUOTAS; i++)
2609 if (old_opts.s_qf_names[i] &&
2610 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2611 kfree(old_opts.s_qf_names[i]);
2612 #endif
2613 return 0;
2614 restore_opts:
2615 sb->s_flags = old_sb_flags;
2616 sbi->s_mount_opt = old_opts.s_mount_opt;
2617 sbi->s_resuid = old_opts.s_resuid;
2618 sbi->s_resgid = old_opts.s_resgid;
2619 sbi->s_commit_interval = old_opts.s_commit_interval;
2620 #ifdef CONFIG_QUOTA
2621 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2622 for (i = 0; i < MAXQUOTAS; i++) {
2623 if (sbi->s_qf_names[i] &&
2624 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2625 kfree(sbi->s_qf_names[i]);
2626 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2627 }
2628 #endif
2629 return err;
2630 }
2631
2632 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2633 {
2634 struct super_block *sb = dentry->d_sb;
2635 struct ext3_sb_info *sbi = EXT3_SB(sb);
2636 struct ext3_super_block *es = sbi->s_es;
2637 u64 fsid;
2638
2639 if (test_opt(sb, MINIX_DF)) {
2640 sbi->s_overhead_last = 0;
2641 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2642 unsigned long ngroups = sbi->s_groups_count, i;
2643 ext3_fsblk_t overhead = 0;
2644 smp_rmb();
2645
2646 /*
2647 * Compute the overhead (FS structures). This is constant
2648 * for a given filesystem unless the number of block groups
2649 * changes so we cache the previous value until it does.
2650 */
2651
2652 /*
2653 * All of the blocks before first_data_block are
2654 * overhead
2655 */
2656 overhead = le32_to_cpu(es->s_first_data_block);
2657
2658 /*
2659 * Add the overhead attributed to the superblock and
2660 * block group descriptors. If the sparse superblocks
2661 * feature is turned on, then not all groups have this.
2662 */
2663 for (i = 0; i < ngroups; i++) {
2664 overhead += ext3_bg_has_super(sb, i) +
2665 ext3_bg_num_gdb(sb, i);
2666 cond_resched();
2667 }
2668
2669 /*
2670 * Every block group has an inode bitmap, a block
2671 * bitmap, and an inode table.
2672 */
2673 overhead += ngroups * (2 + sbi->s_itb_per_group);
2674 sbi->s_overhead_last = overhead;
2675 smp_wmb();
2676 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2677 }
2678
2679 buf->f_type = EXT3_SUPER_MAGIC;
2680 buf->f_bsize = sb->s_blocksize;
2681 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2682 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2683 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2684 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2685 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2686 buf->f_bavail = 0;
2687 buf->f_files = le32_to_cpu(es->s_inodes_count);
2688 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2689 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2690 buf->f_namelen = EXT3_NAME_LEN;
2691 fsid = le64_to_cpup((void *)es->s_uuid) ^
2692 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2693 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2694 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2695 return 0;
2696 }
2697
2698 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2699 * is locked for write. Otherwise the are possible deadlocks:
2700 * Process 1 Process 2
2701 * ext3_create() quota_sync()
2702 * journal_start() write_dquot()
2703 * DQUOT_INIT() down(dqio_mutex)
2704 * down(dqio_mutex) journal_start()
2705 *
2706 */
2707
2708 #ifdef CONFIG_QUOTA
2709
2710 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2711 {
2712 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2713 }
2714
2715 static int ext3_write_dquot(struct dquot *dquot)
2716 {
2717 int ret, err;
2718 handle_t *handle;
2719 struct inode *inode;
2720
2721 inode = dquot_to_inode(dquot);
2722 handle = ext3_journal_start(inode,
2723 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2724 if (IS_ERR(handle))
2725 return PTR_ERR(handle);
2726 ret = dquot_commit(dquot);
2727 err = ext3_journal_stop(handle);
2728 if (!ret)
2729 ret = err;
2730 return ret;
2731 }
2732
2733 static int ext3_acquire_dquot(struct dquot *dquot)
2734 {
2735 int ret, err;
2736 handle_t *handle;
2737
2738 handle = ext3_journal_start(dquot_to_inode(dquot),
2739 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2740 if (IS_ERR(handle))
2741 return PTR_ERR(handle);
2742 ret = dquot_acquire(dquot);
2743 err = ext3_journal_stop(handle);
2744 if (!ret)
2745 ret = err;
2746 return ret;
2747 }
2748
2749 static int ext3_release_dquot(struct dquot *dquot)
2750 {
2751 int ret, err;
2752 handle_t *handle;
2753
2754 handle = ext3_journal_start(dquot_to_inode(dquot),
2755 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2756 if (IS_ERR(handle)) {
2757 /* Release dquot anyway to avoid endless cycle in dqput() */
2758 dquot_release(dquot);
2759 return PTR_ERR(handle);
2760 }
2761 ret = dquot_release(dquot);
2762 err = ext3_journal_stop(handle);
2763 if (!ret)
2764 ret = err;
2765 return ret;
2766 }
2767
2768 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2769 {
2770 /* Are we journaling quotas? */
2771 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2772 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2773 dquot_mark_dquot_dirty(dquot);
2774 return ext3_write_dquot(dquot);
2775 } else {
2776 return dquot_mark_dquot_dirty(dquot);
2777 }
2778 }
2779
2780 static int ext3_write_info(struct super_block *sb, int type)
2781 {
2782 int ret, err;
2783 handle_t *handle;
2784
2785 /* Data block + inode block */
2786 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2787 if (IS_ERR(handle))
2788 return PTR_ERR(handle);
2789 ret = dquot_commit_info(sb, type);
2790 err = ext3_journal_stop(handle);
2791 if (!ret)
2792 ret = err;
2793 return ret;
2794 }
2795
2796 /*
2797 * Turn on quotas during mount time - we need to find
2798 * the quota file and such...
2799 */
2800 static int ext3_quota_on_mount(struct super_block *sb, int type)
2801 {
2802 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2803 EXT3_SB(sb)->s_jquota_fmt, type);
2804 }
2805
2806 /*
2807 * Standard function to be called on quota_on
2808 */
2809 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2810 char *name, int remount)
2811 {
2812 int err;
2813 struct path path;
2814
2815 if (!test_opt(sb, QUOTA))
2816 return -EINVAL;
2817 /* When remounting, no checks are needed and in fact, name is NULL */
2818 if (remount)
2819 return vfs_quota_on(sb, type, format_id, name, remount);
2820
2821 err = kern_path(name, LOOKUP_FOLLOW, &path);
2822 if (err)
2823 return err;
2824
2825 /* Quotafile not on the same filesystem? */
2826 if (path.mnt->mnt_sb != sb) {
2827 path_put(&path);
2828 return -EXDEV;
2829 }
2830 /* Journaling quota? */
2831 if (EXT3_SB(sb)->s_qf_names[type]) {
2832 /* Quotafile not of fs root? */
2833 if (path.dentry->d_parent != sb->s_root)
2834 printk(KERN_WARNING
2835 "EXT3-fs: Quota file not on filesystem root. "
2836 "Journaled quota will not work.\n");
2837 }
2838
2839 /*
2840 * When we journal data on quota file, we have to flush journal to see
2841 * all updates to the file when we bypass pagecache...
2842 */
2843 if (ext3_should_journal_data(path.dentry->d_inode)) {
2844 /*
2845 * We don't need to lock updates but journal_flush() could
2846 * otherwise be livelocked...
2847 */
2848 journal_lock_updates(EXT3_SB(sb)->s_journal);
2849 err = journal_flush(EXT3_SB(sb)->s_journal);
2850 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2851 if (err) {
2852 path_put(&path);
2853 return err;
2854 }
2855 }
2856
2857 err = vfs_quota_on_path(sb, type, format_id, &path);
2858 path_put(&path);
2859 return err;
2860 }
2861
2862 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2863 * acquiring the locks... As quota files are never truncated and quota code
2864 * itself serializes the operations (and noone else should touch the files)
2865 * we don't have to be afraid of races */
2866 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2867 size_t len, loff_t off)
2868 {
2869 struct inode *inode = sb_dqopt(sb)->files[type];
2870 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2871 int err = 0;
2872 int offset = off & (sb->s_blocksize - 1);
2873 int tocopy;
2874 size_t toread;
2875 struct buffer_head *bh;
2876 loff_t i_size = i_size_read(inode);
2877
2878 if (off > i_size)
2879 return 0;
2880 if (off+len > i_size)
2881 len = i_size-off;
2882 toread = len;
2883 while (toread > 0) {
2884 tocopy = sb->s_blocksize - offset < toread ?
2885 sb->s_blocksize - offset : toread;
2886 bh = ext3_bread(NULL, inode, blk, 0, &err);
2887 if (err)
2888 return err;
2889 if (!bh) /* A hole? */
2890 memset(data, 0, tocopy);
2891 else
2892 memcpy(data, bh->b_data+offset, tocopy);
2893 brelse(bh);
2894 offset = 0;
2895 toread -= tocopy;
2896 data += tocopy;
2897 blk++;
2898 }
2899 return len;
2900 }
2901
2902 /* Write to quotafile (we know the transaction is already started and has
2903 * enough credits) */
2904 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2905 const char *data, size_t len, loff_t off)
2906 {
2907 struct inode *inode = sb_dqopt(sb)->files[type];
2908 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2909 int err = 0;
2910 int offset = off & (sb->s_blocksize - 1);
2911 int tocopy;
2912 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2913 size_t towrite = len;
2914 struct buffer_head *bh;
2915 handle_t *handle = journal_current_handle();
2916
2917 if (!handle) {
2918 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2919 " cancelled because transaction is not started.\n",
2920 (unsigned long long)off, (unsigned long long)len);
2921 return -EIO;
2922 }
2923 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2924 while (towrite > 0) {
2925 tocopy = sb->s_blocksize - offset < towrite ?
2926 sb->s_blocksize - offset : towrite;
2927 bh = ext3_bread(handle, inode, blk, 1, &err);
2928 if (!bh)
2929 goto out;
2930 if (journal_quota) {
2931 err = ext3_journal_get_write_access(handle, bh);
2932 if (err) {
2933 brelse(bh);
2934 goto out;
2935 }
2936 }
2937 lock_buffer(bh);
2938 memcpy(bh->b_data+offset, data, tocopy);
2939 flush_dcache_page(bh->b_page);
2940 unlock_buffer(bh);
2941 if (journal_quota)
2942 err = ext3_journal_dirty_metadata(handle, bh);
2943 else {
2944 /* Always do at least ordered writes for quotas */
2945 err = ext3_journal_dirty_data(handle, bh);
2946 mark_buffer_dirty(bh);
2947 }
2948 brelse(bh);
2949 if (err)
2950 goto out;
2951 offset = 0;
2952 towrite -= tocopy;
2953 data += tocopy;
2954 blk++;
2955 }
2956 out:
2957 if (len == towrite) {
2958 mutex_unlock(&inode->i_mutex);
2959 return err;
2960 }
2961 if (inode->i_size < off+len-towrite) {
2962 i_size_write(inode, off+len-towrite);
2963 EXT3_I(inode)->i_disksize = inode->i_size;
2964 }
2965 inode->i_version++;
2966 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2967 ext3_mark_inode_dirty(handle, inode);
2968 mutex_unlock(&inode->i_mutex);
2969 return len - towrite;
2970 }
2971
2972 #endif
2973
2974 static int ext3_get_sb(struct file_system_type *fs_type,
2975 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2976 {
2977 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2978 }
2979
2980 static struct file_system_type ext3_fs_type = {
2981 .owner = THIS_MODULE,
2982 .name = "ext3",
2983 .get_sb = ext3_get_sb,
2984 .kill_sb = kill_block_super,
2985 .fs_flags = FS_REQUIRES_DEV,
2986 };
2987
2988 static int __init init_ext3_fs(void)
2989 {
2990 int err = init_ext3_xattr();
2991 if (err)
2992 return err;
2993 err = init_inodecache();
2994 if (err)
2995 goto out1;
2996 err = register_filesystem(&ext3_fs_type);
2997 if (err)
2998 goto out;
2999 return 0;
3000 out:
3001 destroy_inodecache();
3002 out1:
3003 exit_ext3_xattr();
3004 return err;
3005 }
3006
3007 static void __exit exit_ext3_fs(void)
3008 {
3009 unregister_filesystem(&ext3_fs_type);
3010 destroy_inodecache();
3011 exit_ext3_xattr();
3012 }
3013
3014 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3015 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3016 MODULE_LICENSE("GPL");
3017 module_init(init_ext3_fs)
3018 module_exit(exit_ext3_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree