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[PATCH] ext3: Add "-o bh" option
[linux-2.6/suspend2-2.6.18.git] / fs / ext3 / super.c
blobb7483360a2db4ab49b796d370d0089b23c6d95f8
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/config.h>
20 #include <linux/module.h>
21 #include <linux/string.h>
22 #include <linux/fs.h>
23 #include <linux/time.h>
24 #include <linux/jbd.h>
25 #include <linux/ext3_fs.h>
26 #include <linux/ext3_jbd.h>
27 #include <linux/slab.h>
28 #include <linux/init.h>
29 #include <linux/blkdev.h>
30 #include <linux/parser.h>
31 #include <linux/smp_lock.h>
32 #include <linux/buffer_head.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
40 #include <asm/uaccess.h>
41
42 #include "xattr.h"
43 #include "acl.h"
44 #include "namei.h"
45
46 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
47 unsigned long journal_devnum);
48 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
49 int);
50 static void ext3_commit_super (struct super_block * sb,
51 struct ext3_super_block * es,
52 int sync);
53 static void ext3_mark_recovery_complete(struct super_block * sb,
54 struct ext3_super_block * es);
55 static void ext3_clear_journal_err(struct super_block * sb,
56 struct ext3_super_block * es);
57 static int ext3_sync_fs(struct super_block *sb, int wait);
58 static const char *ext3_decode_error(struct super_block * sb, int errno,
59 char nbuf[16]);
60 static int ext3_remount (struct super_block * sb, int * flags, char * data);
61 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
62 static void ext3_unlockfs(struct super_block *sb);
63 static void ext3_write_super (struct super_block * sb);
64 static void ext3_write_super_lockfs(struct super_block *sb);
65
66 /*
67 * Wrappers for journal_start/end.
68 *
69 * The only special thing we need to do here is to make sure that all
70 * journal_end calls result in the superblock being marked dirty, so
71 * that sync() will call the filesystem's write_super callback if
72 * appropriate.
73 */
74 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
75 {
76 journal_t *journal;
77
78 if (sb->s_flags & MS_RDONLY)
79 return ERR_PTR(-EROFS);
80
81 /* Special case here: if the journal has aborted behind our
82 * backs (eg. EIO in the commit thread), then we still need to
83 * take the FS itself readonly cleanly. */
84 journal = EXT3_SB(sb)->s_journal;
85 if (is_journal_aborted(journal)) {
86 ext3_abort(sb, __FUNCTION__,
87 "Detected aborted journal");
88 return ERR_PTR(-EROFS);
89 }
90
91 return journal_start(journal, nblocks);
92 }
93
94 /*
95 * The only special thing we need to do here is to make sure that all
96 * journal_stop calls result in the superblock being marked dirty, so
97 * that sync() will call the filesystem's write_super callback if
98 * appropriate.
99 */
100 int __ext3_journal_stop(const char *where, handle_t *handle)
101 {
102 struct super_block *sb;
103 int err;
104 int rc;
105
106 sb = handle->h_transaction->t_journal->j_private;
107 err = handle->h_err;
108 rc = journal_stop(handle);
109
110 if (!err)
111 err = rc;
112 if (err)
113 __ext3_std_error(sb, where, err);
114 return err;
115 }
116
117 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
118 struct buffer_head *bh, handle_t *handle, int err)
119 {
120 char nbuf[16];
121 const char *errstr = ext3_decode_error(NULL, err, nbuf);
122
123 if (bh)
124 BUFFER_TRACE(bh, "abort");
125
126 if (!handle->h_err)
127 handle->h_err = err;
128
129 if (is_handle_aborted(handle))
130 return;
131
132 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
133 caller, errstr, err_fn);
134
135 journal_abort_handle(handle);
136 }
137
138 /* Deal with the reporting of failure conditions on a filesystem such as
139 * inconsistencies detected or read IO failures.
140 *
141 * On ext2, we can store the error state of the filesystem in the
142 * superblock. That is not possible on ext3, because we may have other
143 * write ordering constraints on the superblock which prevent us from
144 * writing it out straight away; and given that the journal is about to
145 * be aborted, we can't rely on the current, or future, transactions to
146 * write out the superblock safely.
147 *
148 * We'll just use the journal_abort() error code to record an error in
149 * the journal instead. On recovery, the journal will compain about
150 * that error until we've noted it down and cleared it.
151 */
152
153 static void ext3_handle_error(struct super_block *sb)
154 {
155 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
156
157 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
158 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
159
160 if (sb->s_flags & MS_RDONLY)
161 return;
162
163 if (test_opt (sb, ERRORS_RO)) {
164 printk (KERN_CRIT "Remounting filesystem read-only\n");
165 sb->s_flags |= MS_RDONLY;
166 } else {
167 journal_t *journal = EXT3_SB(sb)->s_journal;
168
169 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
170 if (journal)
171 journal_abort(journal, -EIO);
172 }
173 if (test_opt(sb, ERRORS_PANIC))
174 panic("EXT3-fs (device %s): panic forced after error\n",
175 sb->s_id);
176 ext3_commit_super(sb, es, 1);
177 }
178
179 void ext3_error (struct super_block * sb, const char * function,
180 const char * fmt, ...)
181 {
182 va_list args;
183
184 va_start(args, fmt);
185 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
186 vprintk(fmt, args);
187 printk("\n");
188 va_end(args);
189
190 ext3_handle_error(sb);
191 }
192
193 static const char *ext3_decode_error(struct super_block * sb, int errno,
194 char nbuf[16])
195 {
196 char *errstr = NULL;
197
198 switch (errno) {
199 case -EIO:
200 errstr = "IO failure";
201 break;
202 case -ENOMEM:
203 errstr = "Out of memory";
204 break;
205 case -EROFS:
206 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
207 errstr = "Journal has aborted";
208 else
209 errstr = "Readonly filesystem";
210 break;
211 default:
212 /* If the caller passed in an extra buffer for unknown
213 * errors, textualise them now. Else we just return
214 * NULL. */
215 if (nbuf) {
216 /* Check for truncated error codes... */
217 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
218 errstr = nbuf;
219 }
220 break;
221 }
222
223 return errstr;
224 }
225
226 /* __ext3_std_error decodes expected errors from journaling functions
227 * automatically and invokes the appropriate error response. */
228
229 void __ext3_std_error (struct super_block * sb, const char * function,
230 int errno)
231 {
232 char nbuf[16];
233 const char *errstr;
234
235 /* Special case: if the error is EROFS, and we're not already
236 * inside a transaction, then there's really no point in logging
237 * an error. */
238 if (errno == -EROFS && journal_current_handle() == NULL &&
239 (sb->s_flags & MS_RDONLY))
240 return;
241
242 errstr = ext3_decode_error(sb, errno, nbuf);
243 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
244 sb->s_id, function, errstr);
245
246 ext3_handle_error(sb);
247 }
248
249 /*
250 * ext3_abort is a much stronger failure handler than ext3_error. The
251 * abort function may be used to deal with unrecoverable failures such
252 * as journal IO errors or ENOMEM at a critical moment in log management.
253 *
254 * We unconditionally force the filesystem into an ABORT|READONLY state,
255 * unless the error response on the fs has been set to panic in which
256 * case we take the easy way out and panic immediately.
257 */
258
259 void ext3_abort (struct super_block * sb, const char * function,
260 const char * fmt, ...)
261 {
262 va_list args;
263
264 printk (KERN_CRIT "ext3_abort called.\n");
265
266 va_start(args, fmt);
267 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
268 vprintk(fmt, args);
269 printk("\n");
270 va_end(args);
271
272 if (test_opt(sb, ERRORS_PANIC))
273 panic("EXT3-fs panic from previous error\n");
274
275 if (sb->s_flags & MS_RDONLY)
276 return;
277
278 printk(KERN_CRIT "Remounting filesystem read-only\n");
279 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
280 sb->s_flags |= MS_RDONLY;
281 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
282 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
283 }
284
285 void ext3_warning (struct super_block * sb, const char * function,
286 const char * fmt, ...)
287 {
288 va_list args;
289
290 va_start(args, fmt);
291 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
292 sb->s_id, function);
293 vprintk(fmt, args);
294 printk("\n");
295 va_end(args);
296 }
297
298 void ext3_update_dynamic_rev(struct super_block *sb)
299 {
300 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
301
302 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
303 return;
304
305 ext3_warning(sb, __FUNCTION__,
306 "updating to rev %d because of new feature flag, "
307 "running e2fsck is recommended",
308 EXT3_DYNAMIC_REV);
309
310 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
311 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
312 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
313 /* leave es->s_feature_*compat flags alone */
314 /* es->s_uuid will be set by e2fsck if empty */
315
316 /*
317 * The rest of the superblock fields should be zero, and if not it
318 * means they are likely already in use, so leave them alone. We
319 * can leave it up to e2fsck to clean up any inconsistencies there.
320 */
321 }
322
323 /*
324 * Open the external journal device
325 */
326 static struct block_device *ext3_blkdev_get(dev_t dev)
327 {
328 struct block_device *bdev;
329 char b[BDEVNAME_SIZE];
330
331 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
332 if (IS_ERR(bdev))
333 goto fail;
334 return bdev;
335
336 fail:
337 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
338 __bdevname(dev, b), PTR_ERR(bdev));
339 return NULL;
340 }
341
342 /*
343 * Release the journal device
344 */
345 static int ext3_blkdev_put(struct block_device *bdev)
346 {
347 bd_release(bdev);
348 return blkdev_put(bdev);
349 }
350
351 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
352 {
353 struct block_device *bdev;
354 int ret = -ENODEV;
355
356 bdev = sbi->journal_bdev;
357 if (bdev) {
358 ret = ext3_blkdev_put(bdev);
359 sbi->journal_bdev = NULL;
360 }
361 return ret;
362 }
363
364 static inline struct inode *orphan_list_entry(struct list_head *l)
365 {
366 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
367 }
368
369 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
370 {
371 struct list_head *l;
372
373 printk(KERN_ERR "sb orphan head is %d\n",
374 le32_to_cpu(sbi->s_es->s_last_orphan));
375
376 printk(KERN_ERR "sb_info orphan list:\n");
377 list_for_each(l, &sbi->s_orphan) {
378 struct inode *inode = orphan_list_entry(l);
379 printk(KERN_ERR " "
380 "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
381 inode->i_sb->s_id, inode->i_ino, inode,
382 inode->i_mode, inode->i_nlink,
383 NEXT_ORPHAN(inode));
384 }
385 }
386
387 static void ext3_put_super (struct super_block * sb)
388 {
389 struct ext3_sb_info *sbi = EXT3_SB(sb);
390 struct ext3_super_block *es = sbi->s_es;
391 int i;
392
393 ext3_xattr_put_super(sb);
394 journal_destroy(sbi->s_journal);
395 if (!(sb->s_flags & MS_RDONLY)) {
396 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
397 es->s_state = cpu_to_le16(sbi->s_mount_state);
398 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
399 mark_buffer_dirty(sbi->s_sbh);
400 ext3_commit_super(sb, es, 1);
401 }
402
403 for (i = 0; i < sbi->s_gdb_count; i++)
404 brelse(sbi->s_group_desc[i]);
405 kfree(sbi->s_group_desc);
406 percpu_counter_destroy(&sbi->s_freeblocks_counter);
407 percpu_counter_destroy(&sbi->s_freeinodes_counter);
408 percpu_counter_destroy(&sbi->s_dirs_counter);
409 brelse(sbi->s_sbh);
410 #ifdef CONFIG_QUOTA
411 for (i = 0; i < MAXQUOTAS; i++)
412 kfree(sbi->s_qf_names[i]);
413 #endif
414
415 /* Debugging code just in case the in-memory inode orphan list
416 * isn't empty. The on-disk one can be non-empty if we've
417 * detected an error and taken the fs readonly, but the
418 * in-memory list had better be clean by this point. */
419 if (!list_empty(&sbi->s_orphan))
420 dump_orphan_list(sb, sbi);
421 J_ASSERT(list_empty(&sbi->s_orphan));
422
423 invalidate_bdev(sb->s_bdev, 0);
424 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
425 /*
426 * Invalidate the journal device's buffers. We don't want them
427 * floating about in memory - the physical journal device may
428 * hotswapped, and it breaks the `ro-after' testing code.
429 */
430 sync_blockdev(sbi->journal_bdev);
431 invalidate_bdev(sbi->journal_bdev, 0);
432 ext3_blkdev_remove(sbi);
433 }
434 sb->s_fs_info = NULL;
435 kfree(sbi);
436 return;
437 }
438
439 static kmem_cache_t *ext3_inode_cachep;
440
441 /*
442 * Called inside transaction, so use GFP_NOFS
443 */
444 static struct inode *ext3_alloc_inode(struct super_block *sb)
445 {
446 struct ext3_inode_info *ei;
447
448 ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
449 if (!ei)
450 return NULL;
451 #ifdef CONFIG_EXT3_FS_POSIX_ACL
452 ei->i_acl = EXT3_ACL_NOT_CACHED;
453 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
454 #endif
455 ei->i_block_alloc_info = NULL;
456 ei->vfs_inode.i_version = 1;
457 return &ei->vfs_inode;
458 }
459
460 static void ext3_destroy_inode(struct inode *inode)
461 {
462 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
463 }
464
465 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
466 {
467 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
468
469 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
470 SLAB_CTOR_CONSTRUCTOR) {
471 INIT_LIST_HEAD(&ei->i_orphan);
472 #ifdef CONFIG_EXT3_FS_XATTR
473 init_rwsem(&ei->xattr_sem);
474 #endif
475 mutex_init(&ei->truncate_mutex);
476 inode_init_once(&ei->vfs_inode);
477 }
478 }
479
480 static int init_inodecache(void)
481 {
482 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
483 sizeof(struct ext3_inode_info),
484 0, (SLAB_RECLAIM_ACCOUNT|
485 SLAB_MEM_SPREAD),
486 init_once, NULL);
487 if (ext3_inode_cachep == NULL)
488 return -ENOMEM;
489 return 0;
490 }
491
492 static void destroy_inodecache(void)
493 {
494 if (kmem_cache_destroy(ext3_inode_cachep))
495 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
496 }
497
498 static void ext3_clear_inode(struct inode *inode)
499 {
500 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
501 #ifdef CONFIG_EXT3_FS_POSIX_ACL
502 if (EXT3_I(inode)->i_acl &&
503 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
504 posix_acl_release(EXT3_I(inode)->i_acl);
505 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
506 }
507 if (EXT3_I(inode)->i_default_acl &&
508 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
509 posix_acl_release(EXT3_I(inode)->i_default_acl);
510 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
511 }
512 #endif
513 ext3_discard_reservation(inode);
514 EXT3_I(inode)->i_block_alloc_info = NULL;
515 if (unlikely(rsv))
516 kfree(rsv);
517 }
518
519 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
520 {
521 #if defined(CONFIG_QUOTA)
522 struct ext3_sb_info *sbi = EXT3_SB(sb);
523
524 if (sbi->s_jquota_fmt)
525 seq_printf(seq, ",jqfmt=%s",
526 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
527
528 if (sbi->s_qf_names[USRQUOTA])
529 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
530
531 if (sbi->s_qf_names[GRPQUOTA])
532 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
533
534 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
535 seq_puts(seq, ",usrquota");
536
537 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
538 seq_puts(seq, ",grpquota");
539 #endif
540 }
541
542 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
543 {
544 struct super_block *sb = vfs->mnt_sb;
545
546 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
547 seq_puts(seq, ",data=journal");
548 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
549 seq_puts(seq, ",data=ordered");
550 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
551 seq_puts(seq, ",data=writeback");
552
553 ext3_show_quota_options(seq, sb);
554
555 return 0;
556 }
557
558 #ifdef CONFIG_QUOTA
559 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
560 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
561
562 static int ext3_dquot_initialize(struct inode *inode, int type);
563 static int ext3_dquot_drop(struct inode *inode);
564 static int ext3_write_dquot(struct dquot *dquot);
565 static int ext3_acquire_dquot(struct dquot *dquot);
566 static int ext3_release_dquot(struct dquot *dquot);
567 static int ext3_mark_dquot_dirty(struct dquot *dquot);
568 static int ext3_write_info(struct super_block *sb, int type);
569 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
570 static int ext3_quota_on_mount(struct super_block *sb, int type);
571 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
572 size_t len, loff_t off);
573 static ssize_t ext3_quota_write(struct super_block *sb, int type,
574 const char *data, size_t len, loff_t off);
575
576 static struct dquot_operations ext3_quota_operations = {
577 .initialize = ext3_dquot_initialize,
578 .drop = ext3_dquot_drop,
579 .alloc_space = dquot_alloc_space,
580 .alloc_inode = dquot_alloc_inode,
581 .free_space = dquot_free_space,
582 .free_inode = dquot_free_inode,
583 .transfer = dquot_transfer,
584 .write_dquot = ext3_write_dquot,
585 .acquire_dquot = ext3_acquire_dquot,
586 .release_dquot = ext3_release_dquot,
587 .mark_dirty = ext3_mark_dquot_dirty,
588 .write_info = ext3_write_info
589 };
590
591 static struct quotactl_ops ext3_qctl_operations = {
592 .quota_on = ext3_quota_on,
593 .quota_off = vfs_quota_off,
594 .quota_sync = vfs_quota_sync,
595 .get_info = vfs_get_dqinfo,
596 .set_info = vfs_set_dqinfo,
597 .get_dqblk = vfs_get_dqblk,
598 .set_dqblk = vfs_set_dqblk
599 };
600 #endif
601
602 static struct super_operations ext3_sops = {
603 .alloc_inode = ext3_alloc_inode,
604 .destroy_inode = ext3_destroy_inode,
605 .read_inode = ext3_read_inode,
606 .write_inode = ext3_write_inode,
607 .dirty_inode = ext3_dirty_inode,
608 .delete_inode = ext3_delete_inode,
609 .put_super = ext3_put_super,
610 .write_super = ext3_write_super,
611 .sync_fs = ext3_sync_fs,
612 .write_super_lockfs = ext3_write_super_lockfs,
613 .unlockfs = ext3_unlockfs,
614 .statfs = ext3_statfs,
615 .remount_fs = ext3_remount,
616 .clear_inode = ext3_clear_inode,
617 .show_options = ext3_show_options,
618 #ifdef CONFIG_QUOTA
619 .quota_read = ext3_quota_read,
620 .quota_write = ext3_quota_write,
621 #endif
622 };
623
624 static struct export_operations ext3_export_ops = {
625 .get_parent = ext3_get_parent,
626 };
627
628 enum {
629 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
630 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
631 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
632 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
633 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
634 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
635 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
636 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
637 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
638 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
639 Opt_grpquota
640 };
641
642 static match_table_t tokens = {
643 {Opt_bsd_df, "bsddf"},
644 {Opt_minix_df, "minixdf"},
645 {Opt_grpid, "grpid"},
646 {Opt_grpid, "bsdgroups"},
647 {Opt_nogrpid, "nogrpid"},
648 {Opt_nogrpid, "sysvgroups"},
649 {Opt_resgid, "resgid=%u"},
650 {Opt_resuid, "resuid=%u"},
651 {Opt_sb, "sb=%u"},
652 {Opt_err_cont, "errors=continue"},
653 {Opt_err_panic, "errors=panic"},
654 {Opt_err_ro, "errors=remount-ro"},
655 {Opt_nouid32, "nouid32"},
656 {Opt_nocheck, "nocheck"},
657 {Opt_nocheck, "check=none"},
658 {Opt_debug, "debug"},
659 {Opt_oldalloc, "oldalloc"},
660 {Opt_orlov, "orlov"},
661 {Opt_user_xattr, "user_xattr"},
662 {Opt_nouser_xattr, "nouser_xattr"},
663 {Opt_acl, "acl"},
664 {Opt_noacl, "noacl"},
665 {Opt_reservation, "reservation"},
666 {Opt_noreservation, "noreservation"},
667 {Opt_noload, "noload"},
668 {Opt_nobh, "nobh"},
669 {Opt_bh, "bh"},
670 {Opt_commit, "commit=%u"},
671 {Opt_journal_update, "journal=update"},
672 {Opt_journal_inum, "journal=%u"},
673 {Opt_journal_dev, "journal_dev=%u"},
674 {Opt_abort, "abort"},
675 {Opt_data_journal, "data=journal"},
676 {Opt_data_ordered, "data=ordered"},
677 {Opt_data_writeback, "data=writeback"},
678 {Opt_offusrjquota, "usrjquota="},
679 {Opt_usrjquota, "usrjquota=%s"},
680 {Opt_offgrpjquota, "grpjquota="},
681 {Opt_grpjquota, "grpjquota=%s"},
682 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
683 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
684 {Opt_grpquota, "grpquota"},
685 {Opt_noquota, "noquota"},
686 {Opt_quota, "quota"},
687 {Opt_usrquota, "usrquota"},
688 {Opt_barrier, "barrier=%u"},
689 {Opt_err, NULL},
690 {Opt_resize, "resize"},
691 };
692
693 static ext3_fsblk_t get_sb_block(void **data)
694 {
695 ext3_fsblk_t sb_block;
696 char *options = (char *) *data;
697
698 if (!options || strncmp(options, "sb=", 3) != 0)
699 return 1; /* Default location */
700 options += 3;
701 /*todo: use simple_strtoll with >32bit ext3 */
702 sb_block = simple_strtoul(options, &options, 0);
703 if (*options && *options != ',') {
704 printk("EXT3-fs: Invalid sb specification: %s\n",
705 (char *) *data);
706 return 1;
707 }
708 if (*options == ',')
709 options++;
710 *data = (void *) options;
711 return sb_block;
712 }
713
714 static int parse_options (char *options, struct super_block *sb,
715 unsigned long *inum, unsigned long *journal_devnum,
716 ext3_fsblk_t *n_blocks_count, int is_remount)
717 {
718 struct ext3_sb_info *sbi = EXT3_SB(sb);
719 char * p;
720 substring_t args[MAX_OPT_ARGS];
721 int data_opt = 0;
722 int option;
723 #ifdef CONFIG_QUOTA
724 int qtype;
725 char *qname;
726 #endif
727
728 if (!options)
729 return 1;
730
731 while ((p = strsep (&options, ",")) != NULL) {
732 int token;
733 if (!*p)
734 continue;
735
736 token = match_token(p, tokens, args);
737 switch (token) {
738 case Opt_bsd_df:
739 clear_opt (sbi->s_mount_opt, MINIX_DF);
740 break;
741 case Opt_minix_df:
742 set_opt (sbi->s_mount_opt, MINIX_DF);
743 break;
744 case Opt_grpid:
745 set_opt (sbi->s_mount_opt, GRPID);
746 break;
747 case Opt_nogrpid:
748 clear_opt (sbi->s_mount_opt, GRPID);
749 break;
750 case Opt_resuid:
751 if (match_int(&args[0], &option))
752 return 0;
753 sbi->s_resuid = option;
754 break;
755 case Opt_resgid:
756 if (match_int(&args[0], &option))
757 return 0;
758 sbi->s_resgid = option;
759 break;
760 case Opt_sb:
761 /* handled by get_sb_block() instead of here */
762 /* *sb_block = match_int(&args[0]); */
763 break;
764 case Opt_err_panic:
765 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
766 clear_opt (sbi->s_mount_opt, ERRORS_RO);
767 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
768 break;
769 case Opt_err_ro:
770 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
771 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
772 set_opt (sbi->s_mount_opt, ERRORS_RO);
773 break;
774 case Opt_err_cont:
775 clear_opt (sbi->s_mount_opt, ERRORS_RO);
776 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
777 set_opt (sbi->s_mount_opt, ERRORS_CONT);
778 break;
779 case Opt_nouid32:
780 set_opt (sbi->s_mount_opt, NO_UID32);
781 break;
782 case Opt_nocheck:
783 clear_opt (sbi->s_mount_opt, CHECK);
784 break;
785 case Opt_debug:
786 set_opt (sbi->s_mount_opt, DEBUG);
787 break;
788 case Opt_oldalloc:
789 set_opt (sbi->s_mount_opt, OLDALLOC);
790 break;
791 case Opt_orlov:
792 clear_opt (sbi->s_mount_opt, OLDALLOC);
793 break;
794 #ifdef CONFIG_EXT3_FS_XATTR
795 case Opt_user_xattr:
796 set_opt (sbi->s_mount_opt, XATTR_USER);
797 break;
798 case Opt_nouser_xattr:
799 clear_opt (sbi->s_mount_opt, XATTR_USER);
800 break;
801 #else
802 case Opt_user_xattr:
803 case Opt_nouser_xattr:
804 printk("EXT3 (no)user_xattr options not supported\n");
805 break;
806 #endif
807 #ifdef CONFIG_EXT3_FS_POSIX_ACL
808 case Opt_acl:
809 set_opt(sbi->s_mount_opt, POSIX_ACL);
810 break;
811 case Opt_noacl:
812 clear_opt(sbi->s_mount_opt, POSIX_ACL);
813 break;
814 #else
815 case Opt_acl:
816 case Opt_noacl:
817 printk("EXT3 (no)acl options not supported\n");
818 break;
819 #endif
820 case Opt_reservation:
821 set_opt(sbi->s_mount_opt, RESERVATION);
822 break;
823 case Opt_noreservation:
824 clear_opt(sbi->s_mount_opt, RESERVATION);
825 break;
826 case Opt_journal_update:
827 /* @@@ FIXME */
828 /* Eventually we will want to be able to create
829 a journal file here. For now, only allow the
830 user to specify an existing inode to be the
831 journal file. */
832 if (is_remount) {
833 printk(KERN_ERR "EXT3-fs: cannot specify "
834 "journal on remount\n");
835 return 0;
836 }
837 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
838 break;
839 case Opt_journal_inum:
840 if (is_remount) {
841 printk(KERN_ERR "EXT3-fs: cannot specify "
842 "journal on remount\n");
843 return 0;
844 }
845 if (match_int(&args[0], &option))
846 return 0;
847 *inum = option;
848 break;
849 case Opt_journal_dev:
850 if (is_remount) {
851 printk(KERN_ERR "EXT3-fs: cannot specify "
852 "journal on remount\n");
853 return 0;
854 }
855 if (match_int(&args[0], &option))
856 return 0;
857 *journal_devnum = option;
858 break;
859 case Opt_noload:
860 set_opt (sbi->s_mount_opt, NOLOAD);
861 break;
862 case Opt_commit:
863 if (match_int(&args[0], &option))
864 return 0;
865 if (option < 0)
866 return 0;
867 if (option == 0)
868 option = JBD_DEFAULT_MAX_COMMIT_AGE;
869 sbi->s_commit_interval = HZ * option;
870 break;
871 case Opt_data_journal:
872 data_opt = EXT3_MOUNT_JOURNAL_DATA;
873 goto datacheck;
874 case Opt_data_ordered:
875 data_opt = EXT3_MOUNT_ORDERED_DATA;
876 goto datacheck;
877 case Opt_data_writeback:
878 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
879 datacheck:
880 if (is_remount) {
881 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
882 != data_opt) {
883 printk(KERN_ERR
884 "EXT3-fs: cannot change data "
885 "mode on remount\n");
886 return 0;
887 }
888 } else {
889 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
890 sbi->s_mount_opt |= data_opt;
891 }
892 break;
893 #ifdef CONFIG_QUOTA
894 case Opt_usrjquota:
895 qtype = USRQUOTA;
896 goto set_qf_name;
897 case Opt_grpjquota:
898 qtype = GRPQUOTA;
899 set_qf_name:
900 if (sb_any_quota_enabled(sb)) {
901 printk(KERN_ERR
902 "EXT3-fs: Cannot change journalled "
903 "quota options when quota turned on.\n");
904 return 0;
905 }
906 qname = match_strdup(&args[0]);
907 if (!qname) {
908 printk(KERN_ERR
909 "EXT3-fs: not enough memory for "
910 "storing quotafile name.\n");
911 return 0;
912 }
913 if (sbi->s_qf_names[qtype] &&
914 strcmp(sbi->s_qf_names[qtype], qname)) {
915 printk(KERN_ERR
916 "EXT3-fs: %s quota file already "
917 "specified.\n", QTYPE2NAME(qtype));
918 kfree(qname);
919 return 0;
920 }
921 sbi->s_qf_names[qtype] = qname;
922 if (strchr(sbi->s_qf_names[qtype], '/')) {
923 printk(KERN_ERR
924 "EXT3-fs: quotafile must be on "
925 "filesystem root.\n");
926 kfree(sbi->s_qf_names[qtype]);
927 sbi->s_qf_names[qtype] = NULL;
928 return 0;
929 }
930 set_opt(sbi->s_mount_opt, QUOTA);
931 break;
932 case Opt_offusrjquota:
933 qtype = USRQUOTA;
934 goto clear_qf_name;
935 case Opt_offgrpjquota:
936 qtype = GRPQUOTA;
937 clear_qf_name:
938 if (sb_any_quota_enabled(sb)) {
939 printk(KERN_ERR "EXT3-fs: Cannot change "
940 "journalled quota options when "
941 "quota turned on.\n");
942 return 0;
943 }
944 /*
945 * The space will be released later when all options
946 * are confirmed to be correct
947 */
948 sbi->s_qf_names[qtype] = NULL;
949 break;
950 case Opt_jqfmt_vfsold:
951 sbi->s_jquota_fmt = QFMT_VFS_OLD;
952 break;
953 case Opt_jqfmt_vfsv0:
954 sbi->s_jquota_fmt = QFMT_VFS_V0;
955 break;
956 case Opt_quota:
957 case Opt_usrquota:
958 set_opt(sbi->s_mount_opt, QUOTA);
959 set_opt(sbi->s_mount_opt, USRQUOTA);
960 break;
961 case Opt_grpquota:
962 set_opt(sbi->s_mount_opt, QUOTA);
963 set_opt(sbi->s_mount_opt, GRPQUOTA);
964 break;
965 case Opt_noquota:
966 if (sb_any_quota_enabled(sb)) {
967 printk(KERN_ERR "EXT3-fs: Cannot change quota "
968 "options when quota turned on.\n");
969 return 0;
970 }
971 clear_opt(sbi->s_mount_opt, QUOTA);
972 clear_opt(sbi->s_mount_opt, USRQUOTA);
973 clear_opt(sbi->s_mount_opt, GRPQUOTA);
974 break;
975 #else
976 case Opt_quota:
977 case Opt_usrquota:
978 case Opt_grpquota:
979 case Opt_usrjquota:
980 case Opt_grpjquota:
981 case Opt_offusrjquota:
982 case Opt_offgrpjquota:
983 case Opt_jqfmt_vfsold:
984 case Opt_jqfmt_vfsv0:
985 printk(KERN_ERR
986 "EXT3-fs: journalled quota options not "
987 "supported.\n");
988 break;
989 case Opt_noquota:
990 break;
991 #endif
992 case Opt_abort:
993 set_opt(sbi->s_mount_opt, ABORT);
994 break;
995 case Opt_barrier:
996 if (match_int(&args[0], &option))
997 return 0;
998 if (option)
999 set_opt(sbi->s_mount_opt, BARRIER);
1000 else
1001 clear_opt(sbi->s_mount_opt, BARRIER);
1002 break;
1003 case Opt_ignore:
1004 break;
1005 case Opt_resize:
1006 if (!is_remount) {
1007 printk("EXT3-fs: resize option only available "
1008 "for remount\n");
1009 return 0;
1010 }
1011 if (match_int(&args[0], &option) != 0)
1012 return 0;
1013 *n_blocks_count = option;
1014 break;
1015 case Opt_nobh:
1016 set_opt(sbi->s_mount_opt, NOBH);
1017 break;
1018 case Opt_bh:
1019 clear_opt(sbi->s_mount_opt, NOBH);
1020 break;
1021 default:
1022 printk (KERN_ERR
1023 "EXT3-fs: Unrecognized mount option \"%s\" "
1024 "or missing value\n", p);
1025 return 0;
1026 }
1027 }
1028 #ifdef CONFIG_QUOTA
1029 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1030 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1031 sbi->s_qf_names[USRQUOTA])
1032 clear_opt(sbi->s_mount_opt, USRQUOTA);
1033
1034 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1035 sbi->s_qf_names[GRPQUOTA])
1036 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1037
1038 if ((sbi->s_qf_names[USRQUOTA] &&
1039 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1040 (sbi->s_qf_names[GRPQUOTA] &&
1041 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1042 printk(KERN_ERR "EXT3-fs: old and new quota "
1043 "format mixing.\n");
1044 return 0;
1045 }
1046
1047 if (!sbi->s_jquota_fmt) {
1048 printk(KERN_ERR "EXT3-fs: journalled quota format "
1049 "not specified.\n");
1050 return 0;
1051 }
1052 } else {
1053 if (sbi->s_jquota_fmt) {
1054 printk(KERN_ERR "EXT3-fs: journalled quota format "
1055 "specified with no journalling "
1056 "enabled.\n");
1057 return 0;
1058 }
1059 }
1060 #endif
1061 return 1;
1062 }
1063
1064 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1065 int read_only)
1066 {
1067 struct ext3_sb_info *sbi = EXT3_SB(sb);
1068 int res = 0;
1069
1070 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1071 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1072 "forcing read-only mode\n");
1073 res = MS_RDONLY;
1074 }
1075 if (read_only)
1076 return res;
1077 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1078 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1079 "running e2fsck is recommended\n");
1080 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1081 printk (KERN_WARNING
1082 "EXT3-fs warning: mounting fs with errors, "
1083 "running e2fsck is recommended\n");
1084 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1085 le16_to_cpu(es->s_mnt_count) >=
1086 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1087 printk (KERN_WARNING
1088 "EXT3-fs warning: maximal mount count reached, "
1089 "running e2fsck is recommended\n");
1090 else if (le32_to_cpu(es->s_checkinterval) &&
1091 (le32_to_cpu(es->s_lastcheck) +
1092 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1093 printk (KERN_WARNING
1094 "EXT3-fs warning: checktime reached, "
1095 "running e2fsck is recommended\n");
1096 #if 0
1097 /* @@@ We _will_ want to clear the valid bit if we find
1098 inconsistencies, to force a fsck at reboot. But for
1099 a plain journaled filesystem we can keep it set as
1100 valid forever! :) */
1101 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1102 #endif
1103 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1104 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1105 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1106 es->s_mtime = cpu_to_le32(get_seconds());
1107 ext3_update_dynamic_rev(sb);
1108 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1109
1110 ext3_commit_super(sb, es, 1);
1111 if (test_opt(sb, DEBUG))
1112 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1113 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1114 sb->s_blocksize,
1115 sbi->s_groups_count,
1116 EXT3_BLOCKS_PER_GROUP(sb),
1117 EXT3_INODES_PER_GROUP(sb),
1118 sbi->s_mount_opt);
1119
1120 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1121 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1122 char b[BDEVNAME_SIZE];
1123
1124 printk("external journal on %s\n",
1125 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1126 } else {
1127 printk("internal journal\n");
1128 }
1129 return res;
1130 }
1131
1132 /* Called at mount-time, super-block is locked */
1133 static int ext3_check_descriptors (struct super_block * sb)
1134 {
1135 struct ext3_sb_info *sbi = EXT3_SB(sb);
1136 ext3_fsblk_t block = le32_to_cpu(sbi->s_es->s_first_data_block);
1137 struct ext3_group_desc * gdp = NULL;
1138 int desc_block = 0;
1139 int i;
1140
1141 ext3_debug ("Checking group descriptors");
1142
1143 for (i = 0; i < sbi->s_groups_count; i++)
1144 {
1145 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1146 gdp = (struct ext3_group_desc *)
1147 sbi->s_group_desc[desc_block++]->b_data;
1148 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1149 le32_to_cpu(gdp->bg_block_bitmap) >=
1150 block + EXT3_BLOCKS_PER_GROUP(sb))
1151 {
1152 ext3_error (sb, "ext3_check_descriptors",
1153 "Block bitmap for group %d"
1154 " not in group (block %lu)!",
1155 i, (unsigned long)
1156 le32_to_cpu(gdp->bg_block_bitmap));
1157 return 0;
1158 }
1159 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1160 le32_to_cpu(gdp->bg_inode_bitmap) >=
1161 block + EXT3_BLOCKS_PER_GROUP(sb))
1162 {
1163 ext3_error (sb, "ext3_check_descriptors",
1164 "Inode bitmap for group %d"
1165 " not in group (block %lu)!",
1166 i, (unsigned long)
1167 le32_to_cpu(gdp->bg_inode_bitmap));
1168 return 0;
1169 }
1170 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1171 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1172 block + EXT3_BLOCKS_PER_GROUP(sb))
1173 {
1174 ext3_error (sb, "ext3_check_descriptors",
1175 "Inode table for group %d"
1176 " not in group (block %lu)!",
1177 i, (unsigned long)
1178 le32_to_cpu(gdp->bg_inode_table));
1179 return 0;
1180 }
1181 block += EXT3_BLOCKS_PER_GROUP(sb);
1182 gdp++;
1183 }
1184
1185 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1186 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1187 return 1;
1188 }
1189
1190
1191 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1192 * the superblock) which were deleted from all directories, but held open by
1193 * a process at the time of a crash. We walk the list and try to delete these
1194 * inodes at recovery time (only with a read-write filesystem).
1195 *
1196 * In order to keep the orphan inode chain consistent during traversal (in
1197 * case of crash during recovery), we link each inode into the superblock
1198 * orphan list_head and handle it the same way as an inode deletion during
1199 * normal operation (which journals the operations for us).
1200 *
1201 * We only do an iget() and an iput() on each inode, which is very safe if we
1202 * accidentally point at an in-use or already deleted inode. The worst that
1203 * can happen in this case is that we get a "bit already cleared" message from
1204 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1205 * e2fsck was run on this filesystem, and it must have already done the orphan
1206 * inode cleanup for us, so we can safely abort without any further action.
1207 */
1208 static void ext3_orphan_cleanup (struct super_block * sb,
1209 struct ext3_super_block * es)
1210 {
1211 unsigned int s_flags = sb->s_flags;
1212 int nr_orphans = 0, nr_truncates = 0;
1213 #ifdef CONFIG_QUOTA
1214 int i;
1215 #endif
1216 if (!es->s_last_orphan) {
1217 jbd_debug(4, "no orphan inodes to clean up\n");
1218 return;
1219 }
1220
1221 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1222 if (es->s_last_orphan)
1223 jbd_debug(1, "Errors on filesystem, "
1224 "clearing orphan list.\n");
1225 es->s_last_orphan = 0;
1226 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1227 return;
1228 }
1229
1230 if (s_flags & MS_RDONLY) {
1231 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1232 sb->s_id);
1233 sb->s_flags &= ~MS_RDONLY;
1234 }
1235 #ifdef CONFIG_QUOTA
1236 /* Needed for iput() to work correctly and not trash data */
1237 sb->s_flags |= MS_ACTIVE;
1238 /* Turn on quotas so that they are updated correctly */
1239 for (i = 0; i < MAXQUOTAS; i++) {
1240 if (EXT3_SB(sb)->s_qf_names[i]) {
1241 int ret = ext3_quota_on_mount(sb, i);
1242 if (ret < 0)
1243 printk(KERN_ERR
1244 "EXT3-fs: Cannot turn on journalled "
1245 "quota: error %d\n", ret);
1246 }
1247 }
1248 #endif
1249
1250 while (es->s_last_orphan) {
1251 struct inode *inode;
1252
1253 if (!(inode =
1254 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1255 es->s_last_orphan = 0;
1256 break;
1257 }
1258
1259 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1260 DQUOT_INIT(inode);
1261 if (inode->i_nlink) {
1262 printk(KERN_DEBUG
1263 "%s: truncating inode %ld to %Ld bytes\n",
1264 __FUNCTION__, inode->i_ino, inode->i_size);
1265 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1266 inode->i_ino, inode->i_size);
1267 ext3_truncate(inode);
1268 nr_truncates++;
1269 } else {
1270 printk(KERN_DEBUG
1271 "%s: deleting unreferenced inode %ld\n",
1272 __FUNCTION__, inode->i_ino);
1273 jbd_debug(2, "deleting unreferenced inode %ld\n",
1274 inode->i_ino);
1275 nr_orphans++;
1276 }
1277 iput(inode); /* The delete magic happens here! */
1278 }
1279
1280 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1281
1282 if (nr_orphans)
1283 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1284 sb->s_id, PLURAL(nr_orphans));
1285 if (nr_truncates)
1286 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1287 sb->s_id, PLURAL(nr_truncates));
1288 #ifdef CONFIG_QUOTA
1289 /* Turn quotas off */
1290 for (i = 0; i < MAXQUOTAS; i++) {
1291 if (sb_dqopt(sb)->files[i])
1292 vfs_quota_off(sb, i);
1293 }
1294 #endif
1295 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1296 }
1297
1298 #define log2(n) ffz(~(n))
1299
1300 /*
1301 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1302 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1303 * We need to be 1 filesystem block less than the 2^32 sector limit.
1304 */
1305 static loff_t ext3_max_size(int bits)
1306 {
1307 loff_t res = EXT3_NDIR_BLOCKS;
1308 /* This constant is calculated to be the largest file size for a
1309 * dense, 4k-blocksize file such that the total number of
1310 * sectors in the file, including data and all indirect blocks,
1311 * does not exceed 2^32. */
1312 const loff_t upper_limit = 0x1ff7fffd000LL;
1313
1314 res += 1LL << (bits-2);
1315 res += 1LL << (2*(bits-2));
1316 res += 1LL << (3*(bits-2));
1317 res <<= bits;
1318 if (res > upper_limit)
1319 res = upper_limit;
1320 return res;
1321 }
1322
1323 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1324 ext3_fsblk_t logic_sb_block,
1325 int nr)
1326 {
1327 struct ext3_sb_info *sbi = EXT3_SB(sb);
1328 unsigned long bg, first_meta_bg;
1329 int has_super = 0;
1330
1331 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1332
1333 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1334 nr < first_meta_bg)
1335 return (logic_sb_block + nr + 1);
1336 bg = sbi->s_desc_per_block * nr;
1337 if (ext3_bg_has_super(sb, bg))
1338 has_super = 1;
1339 return (has_super + ext3_group_first_block_no(sb, bg));
1340 }
1341
1342
1343 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1344 {
1345 struct buffer_head * bh;
1346 struct ext3_super_block *es = NULL;
1347 struct ext3_sb_info *sbi;
1348 ext3_fsblk_t block;
1349 ext3_fsblk_t sb_block = get_sb_block(&data);
1350 ext3_fsblk_t logic_sb_block;
1351 unsigned long offset = 0;
1352 unsigned long journal_inum = 0;
1353 unsigned long journal_devnum = 0;
1354 unsigned long def_mount_opts;
1355 struct inode *root;
1356 int blocksize;
1357 int hblock;
1358 int db_count;
1359 int i;
1360 int needs_recovery;
1361 __le32 features;
1362
1363 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1364 if (!sbi)
1365 return -ENOMEM;
1366 sb->s_fs_info = sbi;
1367 memset(sbi, 0, sizeof(*sbi));
1368 sbi->s_mount_opt = 0;
1369 sbi->s_resuid = EXT3_DEF_RESUID;
1370 sbi->s_resgid = EXT3_DEF_RESGID;
1371
1372 unlock_kernel();
1373
1374 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1375 if (!blocksize) {
1376 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1377 goto out_fail;
1378 }
1379
1380 /*
1381 * The ext3 superblock will not be buffer aligned for other than 1kB
1382 * block sizes. We need to calculate the offset from buffer start.
1383 */
1384 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1385 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1386 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1387 } else {
1388 logic_sb_block = sb_block;
1389 }
1390
1391 if (!(bh = sb_bread(sb, logic_sb_block))) {
1392 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1393 goto out_fail;
1394 }
1395 /*
1396 * Note: s_es must be initialized as soon as possible because
1397 * some ext3 macro-instructions depend on its value
1398 */
1399 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1400 sbi->s_es = es;
1401 sb->s_magic = le16_to_cpu(es->s_magic);
1402 if (sb->s_magic != EXT3_SUPER_MAGIC)
1403 goto cantfind_ext3;
1404
1405 /* Set defaults before we parse the mount options */
1406 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1407 if (def_mount_opts & EXT3_DEFM_DEBUG)
1408 set_opt(sbi->s_mount_opt, DEBUG);
1409 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1410 set_opt(sbi->s_mount_opt, GRPID);
1411 if (def_mount_opts & EXT3_DEFM_UID16)
1412 set_opt(sbi->s_mount_opt, NO_UID32);
1413 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1414 set_opt(sbi->s_mount_opt, XATTR_USER);
1415 if (def_mount_opts & EXT3_DEFM_ACL)
1416 set_opt(sbi->s_mount_opt, POSIX_ACL);
1417 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1418 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1419 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1420 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1421 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1422 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1423
1424 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1425 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1426 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1427 set_opt(sbi->s_mount_opt, ERRORS_RO);
1428
1429 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1430 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1431
1432 set_opt(sbi->s_mount_opt, RESERVATION);
1433
1434 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1435 NULL, 0))
1436 goto failed_mount;
1437
1438 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1439 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1440
1441 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1442 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1443 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1444 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1445 printk(KERN_WARNING
1446 "EXT3-fs warning: feature flags set on rev 0 fs, "
1447 "running e2fsck is recommended\n");
1448 /*
1449 * Check feature flags regardless of the revision level, since we
1450 * previously didn't change the revision level when setting the flags,
1451 * so there is a chance incompat flags are set on a rev 0 filesystem.
1452 */
1453 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1454 if (features) {
1455 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1456 "unsupported optional features (%x).\n",
1457 sb->s_id, le32_to_cpu(features));
1458 goto failed_mount;
1459 }
1460 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1461 if (!(sb->s_flags & MS_RDONLY) && features) {
1462 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1463 "unsupported optional features (%x).\n",
1464 sb->s_id, le32_to_cpu(features));
1465 goto failed_mount;
1466 }
1467 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1468
1469 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1470 blocksize > EXT3_MAX_BLOCK_SIZE) {
1471 printk(KERN_ERR
1472 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1473 blocksize, sb->s_id);
1474 goto failed_mount;
1475 }
1476
1477 hblock = bdev_hardsect_size(sb->s_bdev);
1478 if (sb->s_blocksize != blocksize) {
1479 /*
1480 * Make sure the blocksize for the filesystem is larger
1481 * than the hardware sectorsize for the machine.
1482 */
1483 if (blocksize < hblock) {
1484 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1485 "device blocksize %d.\n", blocksize, hblock);
1486 goto failed_mount;
1487 }
1488
1489 brelse (bh);
1490 sb_set_blocksize(sb, blocksize);
1491 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1492 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1493 bh = sb_bread(sb, logic_sb_block);
1494 if (!bh) {
1495 printk(KERN_ERR
1496 "EXT3-fs: Can't read superblock on 2nd try.\n");
1497 goto failed_mount;
1498 }
1499 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1500 sbi->s_es = es;
1501 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1502 printk (KERN_ERR
1503 "EXT3-fs: Magic mismatch, very weird !\n");
1504 goto failed_mount;
1505 }
1506 }
1507
1508 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1509
1510 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1511 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1512 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1513 } else {
1514 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1515 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1516 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1517 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1518 (sbi->s_inode_size > blocksize)) {
1519 printk (KERN_ERR
1520 "EXT3-fs: unsupported inode size: %d\n",
1521 sbi->s_inode_size);
1522 goto failed_mount;
1523 }
1524 }
1525 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1526 le32_to_cpu(es->s_log_frag_size);
1527 if (blocksize != sbi->s_frag_size) {
1528 printk(KERN_ERR
1529 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1530 sbi->s_frag_size, blocksize);
1531 goto failed_mount;
1532 }
1533 sbi->s_frags_per_block = 1;
1534 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1535 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1536 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1537 if (EXT3_INODE_SIZE(sb) == 0)
1538 goto cantfind_ext3;
1539 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1540 if (sbi->s_inodes_per_block == 0)
1541 goto cantfind_ext3;
1542 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1543 sbi->s_inodes_per_block;
1544 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1545 sbi->s_sbh = bh;
1546 sbi->s_mount_state = le16_to_cpu(es->s_state);
1547 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1548 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1549 for (i=0; i < 4; i++)
1550 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1551 sbi->s_def_hash_version = es->s_def_hash_version;
1552
1553 if (sbi->s_blocks_per_group > blocksize * 8) {
1554 printk (KERN_ERR
1555 "EXT3-fs: #blocks per group too big: %lu\n",
1556 sbi->s_blocks_per_group);
1557 goto failed_mount;
1558 }
1559 if (sbi->s_frags_per_group > blocksize * 8) {
1560 printk (KERN_ERR
1561 "EXT3-fs: #fragments per group too big: %lu\n",
1562 sbi->s_frags_per_group);
1563 goto failed_mount;
1564 }
1565 if (sbi->s_inodes_per_group > blocksize * 8) {
1566 printk (KERN_ERR
1567 "EXT3-fs: #inodes per group too big: %lu\n",
1568 sbi->s_inodes_per_group);
1569 goto failed_mount;
1570 }
1571
1572 if (le32_to_cpu(es->s_blocks_count) >
1573 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1574 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1575 " too large to mount safely\n", sb->s_id);
1576 if (sizeof(sector_t) < 8)
1577 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1578 "enabled\n");
1579 goto failed_mount;
1580 }
1581
1582 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1583 goto cantfind_ext3;
1584 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1585 le32_to_cpu(es->s_first_data_block) +
1586 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1587 EXT3_BLOCKS_PER_GROUP(sb);
1588 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1589 EXT3_DESC_PER_BLOCK(sb);
1590 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1591 GFP_KERNEL);
1592 if (sbi->s_group_desc == NULL) {
1593 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1594 goto failed_mount;
1595 }
1596
1597 bgl_lock_init(&sbi->s_blockgroup_lock);
1598
1599 for (i = 0; i < db_count; i++) {
1600 block = descriptor_loc(sb, logic_sb_block, i);
1601 sbi->s_group_desc[i] = sb_bread(sb, block);
1602 if (!sbi->s_group_desc[i]) {
1603 printk (KERN_ERR "EXT3-fs: "
1604 "can't read group descriptor %d\n", i);
1605 db_count = i;
1606 goto failed_mount2;
1607 }
1608 }
1609 if (!ext3_check_descriptors (sb)) {
1610 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1611 goto failed_mount2;
1612 }
1613 sbi->s_gdb_count = db_count;
1614 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1615 spin_lock_init(&sbi->s_next_gen_lock);
1616
1617 percpu_counter_init(&sbi->s_freeblocks_counter,
1618 ext3_count_free_blocks(sb));
1619 percpu_counter_init(&sbi->s_freeinodes_counter,
1620 ext3_count_free_inodes(sb));
1621 percpu_counter_init(&sbi->s_dirs_counter,
1622 ext3_count_dirs(sb));
1623
1624 /* per fileystem reservation list head & lock */
1625 spin_lock_init(&sbi->s_rsv_window_lock);
1626 sbi->s_rsv_window_root = RB_ROOT;
1627 /* Add a single, static dummy reservation to the start of the
1628 * reservation window list --- it gives us a placeholder for
1629 * append-at-start-of-list which makes the allocation logic
1630 * _much_ simpler. */
1631 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1632 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1633 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1634 sbi->s_rsv_window_head.rsv_goal_size = 0;
1635 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1636
1637 /*
1638 * set up enough so that it can read an inode
1639 */
1640 sb->s_op = &ext3_sops;
1641 sb->s_export_op = &ext3_export_ops;
1642 sb->s_xattr = ext3_xattr_handlers;
1643 #ifdef CONFIG_QUOTA
1644 sb->s_qcop = &ext3_qctl_operations;
1645 sb->dq_op = &ext3_quota_operations;
1646 #endif
1647 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1648
1649 sb->s_root = NULL;
1650
1651 needs_recovery = (es->s_last_orphan != 0 ||
1652 EXT3_HAS_INCOMPAT_FEATURE(sb,
1653 EXT3_FEATURE_INCOMPAT_RECOVER));
1654
1655 /*
1656 * The first inode we look at is the journal inode. Don't try
1657 * root first: it may be modified in the journal!
1658 */
1659 if (!test_opt(sb, NOLOAD) &&
1660 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1661 if (ext3_load_journal(sb, es, journal_devnum))
1662 goto failed_mount3;
1663 } else if (journal_inum) {
1664 if (ext3_create_journal(sb, es, journal_inum))
1665 goto failed_mount3;
1666 } else {
1667 if (!silent)
1668 printk (KERN_ERR
1669 "ext3: No journal on filesystem on %s\n",
1670 sb->s_id);
1671 goto failed_mount3;
1672 }
1673
1674 /* We have now updated the journal if required, so we can
1675 * validate the data journaling mode. */
1676 switch (test_opt(sb, DATA_FLAGS)) {
1677 case 0:
1678 /* No mode set, assume a default based on the journal
1679 capabilities: ORDERED_DATA if the journal can
1680 cope, else JOURNAL_DATA */
1681 if (journal_check_available_features
1682 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1683 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1684 else
1685 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1686 break;
1687
1688 case EXT3_MOUNT_ORDERED_DATA:
1689 case EXT3_MOUNT_WRITEBACK_DATA:
1690 if (!journal_check_available_features
1691 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1692 printk(KERN_ERR "EXT3-fs: Journal does not support "
1693 "requested data journaling mode\n");
1694 goto failed_mount4;
1695 }
1696 default:
1697 break;
1698 }
1699
1700 if (test_opt(sb, NOBH)) {
1701 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1702 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1703 "its supported only with writeback mode\n");
1704 clear_opt(sbi->s_mount_opt, NOBH);
1705 }
1706 }
1707 /*
1708 * The journal_load will have done any necessary log recovery,
1709 * so we can safely mount the rest of the filesystem now.
1710 */
1711
1712 root = iget(sb, EXT3_ROOT_INO);
1713 sb->s_root = d_alloc_root(root);
1714 if (!sb->s_root) {
1715 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1716 iput(root);
1717 goto failed_mount4;
1718 }
1719 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1720 dput(sb->s_root);
1721 sb->s_root = NULL;
1722 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1723 goto failed_mount4;
1724 }
1725
1726 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1727 /*
1728 * akpm: core read_super() calls in here with the superblock locked.
1729 * That deadlocks, because orphan cleanup needs to lock the superblock
1730 * in numerous places. Here we just pop the lock - it's relatively
1731 * harmless, because we are now ready to accept write_super() requests,
1732 * and aviro says that's the only reason for hanging onto the
1733 * superblock lock.
1734 */
1735 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1736 ext3_orphan_cleanup(sb, es);
1737 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1738 if (needs_recovery)
1739 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1740 ext3_mark_recovery_complete(sb, es);
1741 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1742 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1743 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1744 "writeback");
1745
1746 lock_kernel();
1747 return 0;
1748
1749 cantfind_ext3:
1750 if (!silent)
1751 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1752 sb->s_id);
1753 goto failed_mount;
1754
1755 failed_mount4:
1756 journal_destroy(sbi->s_journal);
1757 failed_mount3:
1758 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1759 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1760 percpu_counter_destroy(&sbi->s_dirs_counter);
1761 failed_mount2:
1762 for (i = 0; i < db_count; i++)
1763 brelse(sbi->s_group_desc[i]);
1764 kfree(sbi->s_group_desc);
1765 failed_mount:
1766 #ifdef CONFIG_QUOTA
1767 for (i = 0; i < MAXQUOTAS; i++)
1768 kfree(sbi->s_qf_names[i]);
1769 #endif
1770 ext3_blkdev_remove(sbi);
1771 brelse(bh);
1772 out_fail:
1773 sb->s_fs_info = NULL;
1774 kfree(sbi);
1775 lock_kernel();
1776 return -EINVAL;
1777 }
1778
1779 /*
1780 * Setup any per-fs journal parameters now. We'll do this both on
1781 * initial mount, once the journal has been initialised but before we've
1782 * done any recovery; and again on any subsequent remount.
1783 */
1784 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1785 {
1786 struct ext3_sb_info *sbi = EXT3_SB(sb);
1787
1788 if (sbi->s_commit_interval)
1789 journal->j_commit_interval = sbi->s_commit_interval;
1790 /* We could also set up an ext3-specific default for the commit
1791 * interval here, but for now we'll just fall back to the jbd
1792 * default. */
1793
1794 spin_lock(&journal->j_state_lock);
1795 if (test_opt(sb, BARRIER))
1796 journal->j_flags |= JFS_BARRIER;
1797 else
1798 journal->j_flags &= ~JFS_BARRIER;
1799 spin_unlock(&journal->j_state_lock);
1800 }
1801
1802 static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1803 {
1804 struct inode *journal_inode;
1805 journal_t *journal;
1806
1807 /* First, test for the existence of a valid inode on disk. Bad
1808 * things happen if we iget() an unused inode, as the subsequent
1809 * iput() will try to delete it. */
1810
1811 journal_inode = iget(sb, journal_inum);
1812 if (!journal_inode) {
1813 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1814 return NULL;
1815 }
1816 if (!journal_inode->i_nlink) {
1817 make_bad_inode(journal_inode);
1818 iput(journal_inode);
1819 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1820 return NULL;
1821 }
1822
1823 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1824 journal_inode, journal_inode->i_size);
1825 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1826 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1827 iput(journal_inode);
1828 return NULL;
1829 }
1830
1831 journal = journal_init_inode(journal_inode);
1832 if (!journal) {
1833 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1834 iput(journal_inode);
1835 return NULL;
1836 }
1837 journal->j_private = sb;
1838 ext3_init_journal_params(sb, journal);
1839 return journal;
1840 }
1841
1842 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1843 dev_t j_dev)
1844 {
1845 struct buffer_head * bh;
1846 journal_t *journal;
1847 ext3_fsblk_t start;
1848 ext3_fsblk_t len;
1849 int hblock, blocksize;
1850 ext3_fsblk_t sb_block;
1851 unsigned long offset;
1852 struct ext3_super_block * es;
1853 struct block_device *bdev;
1854
1855 bdev = ext3_blkdev_get(j_dev);
1856 if (bdev == NULL)
1857 return NULL;
1858
1859 if (bd_claim(bdev, sb)) {
1860 printk(KERN_ERR
1861 "EXT3: failed to claim external journal device.\n");
1862 blkdev_put(bdev);
1863 return NULL;
1864 }
1865
1866 blocksize = sb->s_blocksize;
1867 hblock = bdev_hardsect_size(bdev);
1868 if (blocksize < hblock) {
1869 printk(KERN_ERR
1870 "EXT3-fs: blocksize too small for journal device.\n");
1871 goto out_bdev;
1872 }
1873
1874 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1875 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1876 set_blocksize(bdev, blocksize);
1877 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1878 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1879 "external journal\n");
1880 goto out_bdev;
1881 }
1882
1883 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1884 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1885 !(le32_to_cpu(es->s_feature_incompat) &
1886 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1887 printk(KERN_ERR "EXT3-fs: external journal has "
1888 "bad superblock\n");
1889 brelse(bh);
1890 goto out_bdev;
1891 }
1892
1893 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1894 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1895 brelse(bh);
1896 goto out_bdev;
1897 }
1898
1899 len = le32_to_cpu(es->s_blocks_count);
1900 start = sb_block + 1;
1901 brelse(bh); /* we're done with the superblock */
1902
1903 journal = journal_init_dev(bdev, sb->s_bdev,
1904 start, len, blocksize);
1905 if (!journal) {
1906 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1907 goto out_bdev;
1908 }
1909 journal->j_private = sb;
1910 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1911 wait_on_buffer(journal->j_sb_buffer);
1912 if (!buffer_uptodate(journal->j_sb_buffer)) {
1913 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1914 goto out_journal;
1915 }
1916 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1917 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1918 "user (unsupported) - %d\n",
1919 be32_to_cpu(journal->j_superblock->s_nr_users));
1920 goto out_journal;
1921 }
1922 EXT3_SB(sb)->journal_bdev = bdev;
1923 ext3_init_journal_params(sb, journal);
1924 return journal;
1925 out_journal:
1926 journal_destroy(journal);
1927 out_bdev:
1928 ext3_blkdev_put(bdev);
1929 return NULL;
1930 }
1931
1932 static int ext3_load_journal(struct super_block *sb,
1933 struct ext3_super_block *es,
1934 unsigned long journal_devnum)
1935 {
1936 journal_t *journal;
1937 int journal_inum = le32_to_cpu(es->s_journal_inum);
1938 dev_t journal_dev;
1939 int err = 0;
1940 int really_read_only;
1941
1942 if (journal_devnum &&
1943 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1944 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
1945 "numbers have changed\n");
1946 journal_dev = new_decode_dev(journal_devnum);
1947 } else
1948 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1949
1950 really_read_only = bdev_read_only(sb->s_bdev);
1951
1952 /*
1953 * Are we loading a blank journal or performing recovery after a
1954 * crash? For recovery, we need to check in advance whether we
1955 * can get read-write access to the device.
1956 */
1957
1958 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1959 if (sb->s_flags & MS_RDONLY) {
1960 printk(KERN_INFO "EXT3-fs: INFO: recovery "
1961 "required on readonly filesystem.\n");
1962 if (really_read_only) {
1963 printk(KERN_ERR "EXT3-fs: write access "
1964 "unavailable, cannot proceed.\n");
1965 return -EROFS;
1966 }
1967 printk (KERN_INFO "EXT3-fs: write access will "
1968 "be enabled during recovery.\n");
1969 }
1970 }
1971
1972 if (journal_inum && journal_dev) {
1973 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1974 "and inode journals!\n");
1975 return -EINVAL;
1976 }
1977
1978 if (journal_inum) {
1979 if (!(journal = ext3_get_journal(sb, journal_inum)))
1980 return -EINVAL;
1981 } else {
1982 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1983 return -EINVAL;
1984 }
1985
1986 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1987 err = journal_update_format(journal);
1988 if (err) {
1989 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1990 journal_destroy(journal);
1991 return err;
1992 }
1993 }
1994
1995 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1996 err = journal_wipe(journal, !really_read_only);
1997 if (!err)
1998 err = journal_load(journal);
1999
2000 if (err) {
2001 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2002 journal_destroy(journal);
2003 return err;
2004 }
2005
2006 EXT3_SB(sb)->s_journal = journal;
2007 ext3_clear_journal_err(sb, es);
2008
2009 if (journal_devnum &&
2010 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2011 es->s_journal_dev = cpu_to_le32(journal_devnum);
2012 sb->s_dirt = 1;
2013
2014 /* Make sure we flush the recovery flag to disk. */
2015 ext3_commit_super(sb, es, 1);
2016 }
2017
2018 return 0;
2019 }
2020
2021 static int ext3_create_journal(struct super_block * sb,
2022 struct ext3_super_block * es,
2023 int journal_inum)
2024 {
2025 journal_t *journal;
2026
2027 if (sb->s_flags & MS_RDONLY) {
2028 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2029 "create journal.\n");
2030 return -EROFS;
2031 }
2032
2033 if (!(journal = ext3_get_journal(sb, journal_inum)))
2034 return -EINVAL;
2035
2036 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
2037 journal_inum);
2038
2039 if (journal_create(journal)) {
2040 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2041 journal_destroy(journal);
2042 return -EIO;
2043 }
2044
2045 EXT3_SB(sb)->s_journal = journal;
2046
2047 ext3_update_dynamic_rev(sb);
2048 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2049 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2050
2051 es->s_journal_inum = cpu_to_le32(journal_inum);
2052 sb->s_dirt = 1;
2053
2054 /* Make sure we flush the recovery flag to disk. */
2055 ext3_commit_super(sb, es, 1);
2056
2057 return 0;
2058 }
2059
2060 static void ext3_commit_super (struct super_block * sb,
2061 struct ext3_super_block * es,
2062 int sync)
2063 {
2064 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2065
2066 if (!sbh)
2067 return;
2068 es->s_wtime = cpu_to_le32(get_seconds());
2069 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2070 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2071 BUFFER_TRACE(sbh, "marking dirty");
2072 mark_buffer_dirty(sbh);
2073 if (sync)
2074 sync_dirty_buffer(sbh);
2075 }
2076
2077
2078 /*
2079 * Have we just finished recovery? If so, and if we are mounting (or
2080 * remounting) the filesystem readonly, then we will end up with a
2081 * consistent fs on disk. Record that fact.
2082 */
2083 static void ext3_mark_recovery_complete(struct super_block * sb,
2084 struct ext3_super_block * es)
2085 {
2086 journal_t *journal = EXT3_SB(sb)->s_journal;
2087
2088 journal_lock_updates(journal);
2089 journal_flush(journal);
2090 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2091 sb->s_flags & MS_RDONLY) {
2092 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2093 sb->s_dirt = 0;
2094 ext3_commit_super(sb, es, 1);
2095 }
2096 journal_unlock_updates(journal);
2097 }
2098
2099 /*
2100 * If we are mounting (or read-write remounting) a filesystem whose journal
2101 * has recorded an error from a previous lifetime, move that error to the
2102 * main filesystem now.
2103 */
2104 static void ext3_clear_journal_err(struct super_block * sb,
2105 struct ext3_super_block * es)
2106 {
2107 journal_t *journal;
2108 int j_errno;
2109 const char *errstr;
2110
2111 journal = EXT3_SB(sb)->s_journal;
2112
2113 /*
2114 * Now check for any error status which may have been recorded in the
2115 * journal by a prior ext3_error() or ext3_abort()
2116 */
2117
2118 j_errno = journal_errno(journal);
2119 if (j_errno) {
2120 char nbuf[16];
2121
2122 errstr = ext3_decode_error(sb, j_errno, nbuf);
2123 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2124 "from previous mount: %s", errstr);
2125 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2126 "filesystem check.");
2127
2128 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2129 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2130 ext3_commit_super (sb, es, 1);
2131
2132 journal_clear_err(journal);
2133 }
2134 }
2135
2136 /*
2137 * Force the running and committing transactions to commit,
2138 * and wait on the commit.
2139 */
2140 int ext3_force_commit(struct super_block *sb)
2141 {
2142 journal_t *journal;
2143 int ret;
2144
2145 if (sb->s_flags & MS_RDONLY)
2146 return 0;
2147
2148 journal = EXT3_SB(sb)->s_journal;
2149 sb->s_dirt = 0;
2150 ret = ext3_journal_force_commit(journal);
2151 return ret;
2152 }
2153
2154 /*
2155 * Ext3 always journals updates to the superblock itself, so we don't
2156 * have to propagate any other updates to the superblock on disk at this
2157 * point. Just start an async writeback to get the buffers on their way
2158 * to the disk.
2159 *
2160 * This implicitly triggers the writebehind on sync().
2161 */
2162
2163 static void ext3_write_super (struct super_block * sb)
2164 {
2165 if (mutex_trylock(&sb->s_lock) != 0)
2166 BUG();
2167 sb->s_dirt = 0;
2168 }
2169
2170 static int ext3_sync_fs(struct super_block *sb, int wait)
2171 {
2172 tid_t target;
2173
2174 sb->s_dirt = 0;
2175 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2176 if (wait)
2177 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2178 }
2179 return 0;
2180 }
2181
2182 /*
2183 * LVM calls this function before a (read-only) snapshot is created. This
2184 * gives us a chance to flush the journal completely and mark the fs clean.
2185 */
2186 static void ext3_write_super_lockfs(struct super_block *sb)
2187 {
2188 sb->s_dirt = 0;
2189
2190 if (!(sb->s_flags & MS_RDONLY)) {
2191 journal_t *journal = EXT3_SB(sb)->s_journal;
2192
2193 /* Now we set up the journal barrier. */
2194 journal_lock_updates(journal);
2195 journal_flush(journal);
2196
2197 /* Journal blocked and flushed, clear needs_recovery flag. */
2198 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2199 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2200 }
2201 }
2202
2203 /*
2204 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2205 * flag here, even though the filesystem is not technically dirty yet.
2206 */
2207 static void ext3_unlockfs(struct super_block *sb)
2208 {
2209 if (!(sb->s_flags & MS_RDONLY)) {
2210 lock_super(sb);
2211 /* Reser the needs_recovery flag before the fs is unlocked. */
2212 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2213 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2214 unlock_super(sb);
2215 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2216 }
2217 }
2218
2219 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2220 {
2221 struct ext3_super_block * es;
2222 struct ext3_sb_info *sbi = EXT3_SB(sb);
2223 ext3_fsblk_t n_blocks_count = 0;
2224 unsigned long old_sb_flags;
2225 struct ext3_mount_options old_opts;
2226 int err;
2227 #ifdef CONFIG_QUOTA
2228 int i;
2229 #endif
2230
2231 /* Store the original options */
2232 old_sb_flags = sb->s_flags;
2233 old_opts.s_mount_opt = sbi->s_mount_opt;
2234 old_opts.s_resuid = sbi->s_resuid;
2235 old_opts.s_resgid = sbi->s_resgid;
2236 old_opts.s_commit_interval = sbi->s_commit_interval;
2237 #ifdef CONFIG_QUOTA
2238 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2239 for (i = 0; i < MAXQUOTAS; i++)
2240 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2241 #endif
2242
2243 /*
2244 * Allow the "check" option to be passed as a remount option.
2245 */
2246 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2247 err = -EINVAL;
2248 goto restore_opts;
2249 }
2250
2251 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2252 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2253
2254 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2255 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2256
2257 es = sbi->s_es;
2258
2259 ext3_init_journal_params(sb, sbi->s_journal);
2260
2261 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2262 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2263 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2264 err = -EROFS;
2265 goto restore_opts;
2266 }
2267
2268 if (*flags & MS_RDONLY) {
2269 /*
2270 * First of all, the unconditional stuff we have to do
2271 * to disable replay of the journal when we next remount
2272 */
2273 sb->s_flags |= MS_RDONLY;
2274
2275 /*
2276 * OK, test if we are remounting a valid rw partition
2277 * readonly, and if so set the rdonly flag and then
2278 * mark the partition as valid again.
2279 */
2280 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2281 (sbi->s_mount_state & EXT3_VALID_FS))
2282 es->s_state = cpu_to_le16(sbi->s_mount_state);
2283
2284 ext3_mark_recovery_complete(sb, es);
2285 } else {
2286 __le32 ret;
2287 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2288 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2289 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2290 "remount RDWR because of unsupported "
2291 "optional features (%x).\n",
2292 sb->s_id, le32_to_cpu(ret));
2293 err = -EROFS;
2294 goto restore_opts;
2295 }
2296 /*
2297 * Mounting a RDONLY partition read-write, so reread
2298 * and store the current valid flag. (It may have
2299 * been changed by e2fsck since we originally mounted
2300 * the partition.)
2301 */
2302 ext3_clear_journal_err(sb, es);
2303 sbi->s_mount_state = le16_to_cpu(es->s_state);
2304 if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2305 err = ret;
2306 goto restore_opts;
2307 }
2308 if (!ext3_setup_super (sb, es, 0))
2309 sb->s_flags &= ~MS_RDONLY;
2310 }
2311 }
2312 #ifdef CONFIG_QUOTA
2313 /* Release old quota file names */
2314 for (i = 0; i < MAXQUOTAS; i++)
2315 if (old_opts.s_qf_names[i] &&
2316 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2317 kfree(old_opts.s_qf_names[i]);
2318 #endif
2319 return 0;
2320 restore_opts:
2321 sb->s_flags = old_sb_flags;
2322 sbi->s_mount_opt = old_opts.s_mount_opt;
2323 sbi->s_resuid = old_opts.s_resuid;
2324 sbi->s_resgid = old_opts.s_resgid;
2325 sbi->s_commit_interval = old_opts.s_commit_interval;
2326 #ifdef CONFIG_QUOTA
2327 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2328 for (i = 0; i < MAXQUOTAS; i++) {
2329 if (sbi->s_qf_names[i] &&
2330 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2331 kfree(sbi->s_qf_names[i]);
2332 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2333 }
2334 #endif
2335 return err;
2336 }
2337
2338 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2339 {
2340 struct super_block *sb = dentry->d_sb;
2341 struct ext3_sb_info *sbi = EXT3_SB(sb);
2342 struct ext3_super_block *es = sbi->s_es;
2343 ext3_fsblk_t overhead;
2344 int i;
2345
2346 if (test_opt (sb, MINIX_DF))
2347 overhead = 0;
2348 else {
2349 unsigned long ngroups;
2350 ngroups = EXT3_SB(sb)->s_groups_count;
2351 smp_rmb();
2352
2353 /*
2354 * Compute the overhead (FS structures)
2355 */
2356
2357 /*
2358 * All of the blocks before first_data_block are
2359 * overhead
2360 */
2361 overhead = le32_to_cpu(es->s_first_data_block);
2362
2363 /*
2364 * Add the overhead attributed to the superblock and
2365 * block group descriptors. If the sparse superblocks
2366 * feature is turned on, then not all groups have this.
2367 */
2368 for (i = 0; i < ngroups; i++) {
2369 overhead += ext3_bg_has_super(sb, i) +
2370 ext3_bg_num_gdb(sb, i);
2371 cond_resched();
2372 }
2373
2374 /*
2375 * Every block group has an inode bitmap, a block
2376 * bitmap, and an inode table.
2377 */
2378 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2379 }
2380
2381 buf->f_type = EXT3_SUPER_MAGIC;
2382 buf->f_bsize = sb->s_blocksize;
2383 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2384 buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
2385 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2386 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2387 buf->f_bavail = 0;
2388 buf->f_files = le32_to_cpu(es->s_inodes_count);
2389 buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
2390 buf->f_namelen = EXT3_NAME_LEN;
2391 return 0;
2392 }
2393
2394 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2395 * is locked for write. Otherwise the are possible deadlocks:
2396 * Process 1 Process 2
2397 * ext3_create() quota_sync()
2398 * journal_start() write_dquot()
2399 * DQUOT_INIT() down(dqio_mutex)
2400 * down(dqio_mutex) journal_start()
2401 *
2402 */
2403
2404 #ifdef CONFIG_QUOTA
2405
2406 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2407 {
2408 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2409 }
2410
2411 static int ext3_dquot_initialize(struct inode *inode, int type)
2412 {
2413 handle_t *handle;
2414 int ret, err;
2415
2416 /* We may create quota structure so we need to reserve enough blocks */
2417 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2418 if (IS_ERR(handle))
2419 return PTR_ERR(handle);
2420 ret = dquot_initialize(inode, type);
2421 err = ext3_journal_stop(handle);
2422 if (!ret)
2423 ret = err;
2424 return ret;
2425 }
2426
2427 static int ext3_dquot_drop(struct inode *inode)
2428 {
2429 handle_t *handle;
2430 int ret, err;
2431
2432 /* We may delete quota structure so we need to reserve enough blocks */
2433 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2434 if (IS_ERR(handle))
2435 return PTR_ERR(handle);
2436 ret = dquot_drop(inode);
2437 err = ext3_journal_stop(handle);
2438 if (!ret)
2439 ret = err;
2440 return ret;
2441 }
2442
2443 static int ext3_write_dquot(struct dquot *dquot)
2444 {
2445 int ret, err;
2446 handle_t *handle;
2447 struct inode *inode;
2448
2449 inode = dquot_to_inode(dquot);
2450 handle = ext3_journal_start(inode,
2451 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2452 if (IS_ERR(handle))
2453 return PTR_ERR(handle);
2454 ret = dquot_commit(dquot);
2455 err = ext3_journal_stop(handle);
2456 if (!ret)
2457 ret = err;
2458 return ret;
2459 }
2460
2461 static int ext3_acquire_dquot(struct dquot *dquot)
2462 {
2463 int ret, err;
2464 handle_t *handle;
2465
2466 handle = ext3_journal_start(dquot_to_inode(dquot),
2467 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2468 if (IS_ERR(handle))
2469 return PTR_ERR(handle);
2470 ret = dquot_acquire(dquot);
2471 err = ext3_journal_stop(handle);
2472 if (!ret)
2473 ret = err;
2474 return ret;
2475 }
2476
2477 static int ext3_release_dquot(struct dquot *dquot)
2478 {
2479 int ret, err;
2480 handle_t *handle;
2481
2482 handle = ext3_journal_start(dquot_to_inode(dquot),
2483 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2484 if (IS_ERR(handle))
2485 return PTR_ERR(handle);
2486 ret = dquot_release(dquot);
2487 err = ext3_journal_stop(handle);
2488 if (!ret)
2489 ret = err;
2490 return ret;
2491 }
2492
2493 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2494 {
2495 /* Are we journalling quotas? */
2496 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2497 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2498 dquot_mark_dquot_dirty(dquot);
2499 return ext3_write_dquot(dquot);
2500 } else {
2501 return dquot_mark_dquot_dirty(dquot);
2502 }
2503 }
2504
2505 static int ext3_write_info(struct super_block *sb, int type)
2506 {
2507 int ret, err;
2508 handle_t *handle;
2509
2510 /* Data block + inode block */
2511 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2512 if (IS_ERR(handle))
2513 return PTR_ERR(handle);
2514 ret = dquot_commit_info(sb, type);
2515 err = ext3_journal_stop(handle);
2516 if (!ret)
2517 ret = err;
2518 return ret;
2519 }
2520
2521 /*
2522 * Turn on quotas during mount time - we need to find
2523 * the quota file and such...
2524 */
2525 static int ext3_quota_on_mount(struct super_block *sb, int type)
2526 {
2527 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2528 EXT3_SB(sb)->s_jquota_fmt, type);
2529 }
2530
2531 /*
2532 * Standard function to be called on quota_on
2533 */
2534 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2535 char *path)
2536 {
2537 int err;
2538 struct nameidata nd;
2539
2540 if (!test_opt(sb, QUOTA))
2541 return -EINVAL;
2542 /* Not journalling quota? */
2543 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2544 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2545 return vfs_quota_on(sb, type, format_id, path);
2546 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2547 if (err)
2548 return err;
2549 /* Quotafile not on the same filesystem? */
2550 if (nd.mnt->mnt_sb != sb) {
2551 path_release(&nd);
2552 return -EXDEV;
2553 }
2554 /* Quotafile not of fs root? */
2555 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2556 printk(KERN_WARNING
2557 "EXT3-fs: Quota file not on filesystem root. "
2558 "Journalled quota will not work.\n");
2559 path_release(&nd);
2560 return vfs_quota_on(sb, type, format_id, path);
2561 }
2562
2563 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2564 * acquiring the locks... As quota files are never truncated and quota code
2565 * itself serializes the operations (and noone else should touch the files)
2566 * we don't have to be afraid of races */
2567 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2568 size_t len, loff_t off)
2569 {
2570 struct inode *inode = sb_dqopt(sb)->files[type];
2571 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2572 int err = 0;
2573 int offset = off & (sb->s_blocksize - 1);
2574 int tocopy;
2575 size_t toread;
2576 struct buffer_head *bh;
2577 loff_t i_size = i_size_read(inode);
2578
2579 if (off > i_size)
2580 return 0;
2581 if (off+len > i_size)
2582 len = i_size-off;
2583 toread = len;
2584 while (toread > 0) {
2585 tocopy = sb->s_blocksize - offset < toread ?
2586 sb->s_blocksize - offset : toread;
2587 bh = ext3_bread(NULL, inode, blk, 0, &err);
2588 if (err)
2589 return err;
2590 if (!bh) /* A hole? */
2591 memset(data, 0, tocopy);
2592 else
2593 memcpy(data, bh->b_data+offset, tocopy);
2594 brelse(bh);
2595 offset = 0;
2596 toread -= tocopy;
2597 data += tocopy;
2598 blk++;
2599 }
2600 return len;
2601 }
2602
2603 /* Write to quotafile (we know the transaction is already started and has
2604 * enough credits) */
2605 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2606 const char *data, size_t len, loff_t off)
2607 {
2608 struct inode *inode = sb_dqopt(sb)->files[type];
2609 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2610 int err = 0;
2611 int offset = off & (sb->s_blocksize - 1);
2612 int tocopy;
2613 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2614 size_t towrite = len;
2615 struct buffer_head *bh;
2616 handle_t *handle = journal_current_handle();
2617
2618 mutex_lock(&inode->i_mutex);
2619 while (towrite > 0) {
2620 tocopy = sb->s_blocksize - offset < towrite ?
2621 sb->s_blocksize - offset : towrite;
2622 bh = ext3_bread(handle, inode, blk, 1, &err);
2623 if (!bh)
2624 goto out;
2625 if (journal_quota) {
2626 err = ext3_journal_get_write_access(handle, bh);
2627 if (err) {
2628 brelse(bh);
2629 goto out;
2630 }
2631 }
2632 lock_buffer(bh);
2633 memcpy(bh->b_data+offset, data, tocopy);
2634 flush_dcache_page(bh->b_page);
2635 unlock_buffer(bh);
2636 if (journal_quota)
2637 err = ext3_journal_dirty_metadata(handle, bh);
2638 else {
2639 /* Always do at least ordered writes for quotas */
2640 err = ext3_journal_dirty_data(handle, bh);
2641 mark_buffer_dirty(bh);
2642 }
2643 brelse(bh);
2644 if (err)
2645 goto out;
2646 offset = 0;
2647 towrite -= tocopy;
2648 data += tocopy;
2649 blk++;
2650 }
2651 out:
2652 if (len == towrite)
2653 return err;
2654 if (inode->i_size < off+len-towrite) {
2655 i_size_write(inode, off+len-towrite);
2656 EXT3_I(inode)->i_disksize = inode->i_size;
2657 }
2658 inode->i_version++;
2659 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2660 ext3_mark_inode_dirty(handle, inode);
2661 mutex_unlock(&inode->i_mutex);
2662 return len - towrite;
2663 }
2664
2665 #endif
2666
2667 static int ext3_get_sb(struct file_system_type *fs_type,
2668 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2669 {
2670 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2671 }
2672
2673 static struct file_system_type ext3_fs_type = {
2674 .owner = THIS_MODULE,
2675 .name = "ext3",
2676 .get_sb = ext3_get_sb,
2677 .kill_sb = kill_block_super,
2678 .fs_flags = FS_REQUIRES_DEV,
2679 };
2680
2681 static int __init init_ext3_fs(void)
2682 {
2683 int err = init_ext3_xattr();
2684 if (err)
2685 return err;
2686 err = init_inodecache();
2687 if (err)
2688 goto out1;
2689 err = register_filesystem(&ext3_fs_type);
2690 if (err)
2691 goto out;
2692 return 0;
2693 out:
2694 destroy_inodecache();
2695 out1:
2696 exit_ext3_xattr();
2697 return err;
2698 }
2699
2700 static void __exit exit_ext3_fs(void)
2701 {
2702 unregister_filesystem(&ext3_fs_type);
2703 destroy_inodecache();
2704 exit_ext3_xattr();
2705 }
2706
2707 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2708 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2709 MODULE_LICENSE("GPL");
2710 module_init(init_ext3_fs)
2711 module_exit(exit_ext3_fs)
Software Suspend 2 for 2.6.18.y (mirror)