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[ARM] 2897/2: PXA2xx IRDA support
[linux-2.6/kvm.git] / fs / ext3 / super.c
blob9e24ceb019fe2cea7ba9dec689006fe2cfc7d390
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 #include <asm/uaccess.h>
40 #include "xattr.h"
41 #include "acl.h"
42
43 static int ext3_load_journal(struct super_block *, struct ext3_super_block *);
44 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
45 int);
46 static void ext3_commit_super (struct super_block * sb,
47 struct ext3_super_block * es,
48 int sync);
49 static void ext3_mark_recovery_complete(struct super_block * sb,
50 struct ext3_super_block * es);
51 static void ext3_clear_journal_err(struct super_block * sb,
52 struct ext3_super_block * es);
53 static int ext3_sync_fs(struct super_block *sb, int wait);
54 static const char *ext3_decode_error(struct super_block * sb, int errno,
55 char nbuf[16]);
56 static int ext3_remount (struct super_block * sb, int * flags, char * data);
57 static int ext3_statfs (struct super_block * sb, struct kstatfs * buf);
58 static void ext3_unlockfs(struct super_block *sb);
59 static void ext3_write_super (struct super_block * sb);
60 static void ext3_write_super_lockfs(struct super_block *sb);
61
62 /*
63 * Wrappers for journal_start/end.
64 *
65 * The only special thing we need to do here is to make sure that all
66 * journal_end calls result in the superblock being marked dirty, so
67 * that sync() will call the filesystem's write_super callback if
68 * appropriate.
69 */
70 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
71 {
72 journal_t *journal;
73
74 if (sb->s_flags & MS_RDONLY)
75 return ERR_PTR(-EROFS);
76
77 /* Special case here: if the journal has aborted behind our
78 * backs (eg. EIO in the commit thread), then we still need to
79 * take the FS itself readonly cleanly. */
80 journal = EXT3_SB(sb)->s_journal;
81 if (is_journal_aborted(journal)) {
82 ext3_abort(sb, __FUNCTION__,
83 "Detected aborted journal");
84 return ERR_PTR(-EROFS);
85 }
86
87 return journal_start(journal, nblocks);
88 }
89
90 /*
91 * The only special thing we need to do here is to make sure that all
92 * journal_stop calls result in the superblock being marked dirty, so
93 * that sync() will call the filesystem's write_super callback if
94 * appropriate.
95 */
96 int __ext3_journal_stop(const char *where, handle_t *handle)
97 {
98 struct super_block *sb;
99 int err;
100 int rc;
101
102 sb = handle->h_transaction->t_journal->j_private;
103 err = handle->h_err;
104 rc = journal_stop(handle);
105
106 if (!err)
107 err = rc;
108 if (err)
109 __ext3_std_error(sb, where, err);
110 return err;
111 }
112
113 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
114 struct buffer_head *bh, handle_t *handle, int err)
115 {
116 char nbuf[16];
117 const char *errstr = ext3_decode_error(NULL, err, nbuf);
118
119 if (bh)
120 BUFFER_TRACE(bh, "abort");
121
122 if (!handle->h_err)
123 handle->h_err = err;
124
125 if (is_handle_aborted(handle))
126 return;
127
128 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
129 caller, errstr, err_fn);
130
131 journal_abort_handle(handle);
132 }
133
134 /* Deal with the reporting of failure conditions on a filesystem such as
135 * inconsistencies detected or read IO failures.
136 *
137 * On ext2, we can store the error state of the filesystem in the
138 * superblock. That is not possible on ext3, because we may have other
139 * write ordering constraints on the superblock which prevent us from
140 * writing it out straight away; and given that the journal is about to
141 * be aborted, we can't rely on the current, or future, transactions to
142 * write out the superblock safely.
143 *
144 * We'll just use the journal_abort() error code to record an error in
145 * the journal instead. On recovery, the journal will compain about
146 * that error until we've noted it down and cleared it.
147 */
148
149 static void ext3_handle_error(struct super_block *sb)
150 {
151 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
152
153 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
154 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
155
156 if (sb->s_flags & MS_RDONLY)
157 return;
158
159 if (test_opt (sb, ERRORS_RO)) {
160 printk (KERN_CRIT "Remounting filesystem read-only\n");
161 sb->s_flags |= MS_RDONLY;
162 } else {
163 journal_t *journal = EXT3_SB(sb)->s_journal;
164
165 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
166 if (journal)
167 journal_abort(journal, -EIO);
168 }
169 if (test_opt(sb, ERRORS_PANIC))
170 panic("EXT3-fs (device %s): panic forced after error\n",
171 sb->s_id);
172 ext3_commit_super(sb, es, 1);
173 }
174
175 void ext3_error (struct super_block * sb, const char * function,
176 const char * fmt, ...)
177 {
178 va_list args;
179
180 va_start(args, fmt);
181 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
182 vprintk(fmt, args);
183 printk("\n");
184 va_end(args);
185
186 ext3_handle_error(sb);
187 }
188
189 static const char *ext3_decode_error(struct super_block * sb, int errno,
190 char nbuf[16])
191 {
192 char *errstr = NULL;
193
194 switch (errno) {
195 case -EIO:
196 errstr = "IO failure";
197 break;
198 case -ENOMEM:
199 errstr = "Out of memory";
200 break;
201 case -EROFS:
202 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
203 errstr = "Journal has aborted";
204 else
205 errstr = "Readonly filesystem";
206 break;
207 default:
208 /* If the caller passed in an extra buffer for unknown
209 * errors, textualise them now. Else we just return
210 * NULL. */
211 if (nbuf) {
212 /* Check for truncated error codes... */
213 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
214 errstr = nbuf;
215 }
216 break;
217 }
218
219 return errstr;
220 }
221
222 /* __ext3_std_error decodes expected errors from journaling functions
223 * automatically and invokes the appropriate error response. */
224
225 void __ext3_std_error (struct super_block * sb, const char * function,
226 int errno)
227 {
228 char nbuf[16];
229 const char *errstr;
230
231 /* Special case: if the error is EROFS, and we're not already
232 * inside a transaction, then there's really no point in logging
233 * an error. */
234 if (errno == -EROFS && journal_current_handle() == NULL &&
235 (sb->s_flags & MS_RDONLY))
236 return;
237
238 errstr = ext3_decode_error(sb, errno, nbuf);
239 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
240 sb->s_id, function, errstr);
241
242 ext3_handle_error(sb);
243 }
244
245 /*
246 * ext3_abort is a much stronger failure handler than ext3_error. The
247 * abort function may be used to deal with unrecoverable failures such
248 * as journal IO errors or ENOMEM at a critical moment in log management.
249 *
250 * We unconditionally force the filesystem into an ABORT|READONLY state,
251 * unless the error response on the fs has been set to panic in which
252 * case we take the easy way out and panic immediately.
253 */
254
255 void ext3_abort (struct super_block * sb, const char * function,
256 const char * fmt, ...)
257 {
258 va_list args;
259
260 printk (KERN_CRIT "ext3_abort called.\n");
261
262 va_start(args, fmt);
263 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
264 vprintk(fmt, args);
265 printk("\n");
266 va_end(args);
267
268 if (test_opt(sb, ERRORS_PANIC))
269 panic("EXT3-fs panic from previous error\n");
270
271 if (sb->s_flags & MS_RDONLY)
272 return;
273
274 printk(KERN_CRIT "Remounting filesystem read-only\n");
275 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
276 sb->s_flags |= MS_RDONLY;
277 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
278 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
279 }
280
281 void ext3_warning (struct super_block * sb, const char * function,
282 const char * fmt, ...)
283 {
284 va_list args;
285
286 va_start(args, fmt);
287 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
288 sb->s_id, function);
289 vprintk(fmt, args);
290 printk("\n");
291 va_end(args);
292 }
293
294 void ext3_update_dynamic_rev(struct super_block *sb)
295 {
296 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
297
298 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
299 return;
300
301 ext3_warning(sb, __FUNCTION__,
302 "updating to rev %d because of new feature flag, "
303 "running e2fsck is recommended",
304 EXT3_DYNAMIC_REV);
305
306 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
307 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
308 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
309 /* leave es->s_feature_*compat flags alone */
310 /* es->s_uuid will be set by e2fsck if empty */
311
312 /*
313 * The rest of the superblock fields should be zero, and if not it
314 * means they are likely already in use, so leave them alone. We
315 * can leave it up to e2fsck to clean up any inconsistencies there.
316 */
317 }
318
319 /*
320 * Open the external journal device
321 */
322 static struct block_device *ext3_blkdev_get(dev_t dev)
323 {
324 struct block_device *bdev;
325 char b[BDEVNAME_SIZE];
326
327 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
328 if (IS_ERR(bdev))
329 goto fail;
330 return bdev;
331
332 fail:
333 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
334 __bdevname(dev, b), PTR_ERR(bdev));
335 return NULL;
336 }
337
338 /*
339 * Release the journal device
340 */
341 static int ext3_blkdev_put(struct block_device *bdev)
342 {
343 bd_release(bdev);
344 return blkdev_put(bdev);
345 }
346
347 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
348 {
349 struct block_device *bdev;
350 int ret = -ENODEV;
351
352 bdev = sbi->journal_bdev;
353 if (bdev) {
354 ret = ext3_blkdev_put(bdev);
355 sbi->journal_bdev = NULL;
356 }
357 return ret;
358 }
359
360 static inline struct inode *orphan_list_entry(struct list_head *l)
361 {
362 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
363 }
364
365 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
366 {
367 struct list_head *l;
368
369 printk(KERN_ERR "sb orphan head is %d\n",
370 le32_to_cpu(sbi->s_es->s_last_orphan));
371
372 printk(KERN_ERR "sb_info orphan list:\n");
373 list_for_each(l, &sbi->s_orphan) {
374 struct inode *inode = orphan_list_entry(l);
375 printk(KERN_ERR " "
376 "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
377 inode->i_sb->s_id, inode->i_ino, inode,
378 inode->i_mode, inode->i_nlink,
379 NEXT_ORPHAN(inode));
380 }
381 }
382
383 static void ext3_put_super (struct super_block * sb)
384 {
385 struct ext3_sb_info *sbi = EXT3_SB(sb);
386 struct ext3_super_block *es = sbi->s_es;
387 int i;
388
389 ext3_xattr_put_super(sb);
390 journal_destroy(sbi->s_journal);
391 if (!(sb->s_flags & MS_RDONLY)) {
392 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
393 es->s_state = cpu_to_le16(sbi->s_mount_state);
394 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
395 mark_buffer_dirty(sbi->s_sbh);
396 ext3_commit_super(sb, es, 1);
397 }
398
399 for (i = 0; i < sbi->s_gdb_count; i++)
400 brelse(sbi->s_group_desc[i]);
401 kfree(sbi->s_group_desc);
402 percpu_counter_destroy(&sbi->s_freeblocks_counter);
403 percpu_counter_destroy(&sbi->s_freeinodes_counter);
404 percpu_counter_destroy(&sbi->s_dirs_counter);
405 brelse(sbi->s_sbh);
406 #ifdef CONFIG_QUOTA
407 for (i = 0; i < MAXQUOTAS; i++)
408 kfree(sbi->s_qf_names[i]);
409 #endif
410
411 /* Debugging code just in case the in-memory inode orphan list
412 * isn't empty. The on-disk one can be non-empty if we've
413 * detected an error and taken the fs readonly, but the
414 * in-memory list had better be clean by this point. */
415 if (!list_empty(&sbi->s_orphan))
416 dump_orphan_list(sb, sbi);
417 J_ASSERT(list_empty(&sbi->s_orphan));
418
419 invalidate_bdev(sb->s_bdev, 0);
420 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
421 /*
422 * Invalidate the journal device's buffers. We don't want them
423 * floating about in memory - the physical journal device may
424 * hotswapped, and it breaks the `ro-after' testing code.
425 */
426 sync_blockdev(sbi->journal_bdev);
427 invalidate_bdev(sbi->journal_bdev, 0);
428 ext3_blkdev_remove(sbi);
429 }
430 sb->s_fs_info = NULL;
431 kfree(sbi);
432 return;
433 }
434
435 static kmem_cache_t *ext3_inode_cachep;
436
437 /*
438 * Called inside transaction, so use GFP_NOFS
439 */
440 static struct inode *ext3_alloc_inode(struct super_block *sb)
441 {
442 struct ext3_inode_info *ei;
443
444 ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
445 if (!ei)
446 return NULL;
447 #ifdef CONFIG_EXT3_FS_POSIX_ACL
448 ei->i_acl = EXT3_ACL_NOT_CACHED;
449 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
450 #endif
451 ei->i_block_alloc_info = NULL;
452 ei->vfs_inode.i_version = 1;
453 return &ei->vfs_inode;
454 }
455
456 static void ext3_destroy_inode(struct inode *inode)
457 {
458 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
459 }
460
461 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
462 {
463 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
464
465 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
466 SLAB_CTOR_CONSTRUCTOR) {
467 INIT_LIST_HEAD(&ei->i_orphan);
468 #ifdef CONFIG_EXT3_FS_XATTR
469 init_rwsem(&ei->xattr_sem);
470 #endif
471 init_MUTEX(&ei->truncate_sem);
472 inode_init_once(&ei->vfs_inode);
473 }
474 }
475
476 static int init_inodecache(void)
477 {
478 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
479 sizeof(struct ext3_inode_info),
480 0, SLAB_RECLAIM_ACCOUNT,
481 init_once, NULL);
482 if (ext3_inode_cachep == NULL)
483 return -ENOMEM;
484 return 0;
485 }
486
487 static void destroy_inodecache(void)
488 {
489 if (kmem_cache_destroy(ext3_inode_cachep))
490 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
491 }
492
493 static void ext3_clear_inode(struct inode *inode)
494 {
495 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
496 #ifdef CONFIG_EXT3_FS_POSIX_ACL
497 if (EXT3_I(inode)->i_acl &&
498 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
499 posix_acl_release(EXT3_I(inode)->i_acl);
500 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
501 }
502 if (EXT3_I(inode)->i_default_acl &&
503 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
504 posix_acl_release(EXT3_I(inode)->i_default_acl);
505 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
506 }
507 #endif
508 ext3_discard_reservation(inode);
509 EXT3_I(inode)->i_block_alloc_info = NULL;
510 kfree(rsv);
511 }
512
513 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
514 {
515 struct super_block *sb = vfs->mnt_sb;
516 struct ext3_sb_info *sbi = EXT3_SB(sb);
517
518 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
519 seq_puts(seq, ",data=journal");
520 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
521 seq_puts(seq, ",data=ordered");
522 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
523 seq_puts(seq, ",data=writeback");
524
525 #if defined(CONFIG_QUOTA)
526 if (sbi->s_jquota_fmt)
527 seq_printf(seq, ",jqfmt=%s",
528 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
529
530 if (sbi->s_qf_names[USRQUOTA])
531 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
532
533 if (sbi->s_qf_names[GRPQUOTA])
534 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
535
536 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
537 seq_puts(seq, ",usrquota");
538
539 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
540 seq_puts(seq, ",grpquota");
541 #endif
542
543 return 0;
544 }
545
546 #ifdef CONFIG_QUOTA
547 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
548 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
549
550 static int ext3_dquot_initialize(struct inode *inode, int type);
551 static int ext3_dquot_drop(struct inode *inode);
552 static int ext3_write_dquot(struct dquot *dquot);
553 static int ext3_acquire_dquot(struct dquot *dquot);
554 static int ext3_release_dquot(struct dquot *dquot);
555 static int ext3_mark_dquot_dirty(struct dquot *dquot);
556 static int ext3_write_info(struct super_block *sb, int type);
557 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
558 static int ext3_quota_on_mount(struct super_block *sb, int type);
559 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
560 size_t len, loff_t off);
561 static ssize_t ext3_quota_write(struct super_block *sb, int type,
562 const char *data, size_t len, loff_t off);
563
564 static struct dquot_operations ext3_quota_operations = {
565 .initialize = ext3_dquot_initialize,
566 .drop = ext3_dquot_drop,
567 .alloc_space = dquot_alloc_space,
568 .alloc_inode = dquot_alloc_inode,
569 .free_space = dquot_free_space,
570 .free_inode = dquot_free_inode,
571 .transfer = dquot_transfer,
572 .write_dquot = ext3_write_dquot,
573 .acquire_dquot = ext3_acquire_dquot,
574 .release_dquot = ext3_release_dquot,
575 .mark_dirty = ext3_mark_dquot_dirty,
576 .write_info = ext3_write_info
577 };
578
579 static struct quotactl_ops ext3_qctl_operations = {
580 .quota_on = ext3_quota_on,
581 .quota_off = vfs_quota_off,
582 .quota_sync = vfs_quota_sync,
583 .get_info = vfs_get_dqinfo,
584 .set_info = vfs_set_dqinfo,
585 .get_dqblk = vfs_get_dqblk,
586 .set_dqblk = vfs_set_dqblk
587 };
588 #endif
589
590 static struct super_operations ext3_sops = {
591 .alloc_inode = ext3_alloc_inode,
592 .destroy_inode = ext3_destroy_inode,
593 .read_inode = ext3_read_inode,
594 .write_inode = ext3_write_inode,
595 .dirty_inode = ext3_dirty_inode,
596 .delete_inode = ext3_delete_inode,
597 .put_super = ext3_put_super,
598 .write_super = ext3_write_super,
599 .sync_fs = ext3_sync_fs,
600 .write_super_lockfs = ext3_write_super_lockfs,
601 .unlockfs = ext3_unlockfs,
602 .statfs = ext3_statfs,
603 .remount_fs = ext3_remount,
604 .clear_inode = ext3_clear_inode,
605 .show_options = ext3_show_options,
606 #ifdef CONFIG_QUOTA
607 .quota_read = ext3_quota_read,
608 .quota_write = ext3_quota_write,
609 #endif
610 };
611
612 struct dentry *ext3_get_parent(struct dentry *child);
613 static struct export_operations ext3_export_ops = {
614 .get_parent = ext3_get_parent,
615 };
616
617 enum {
618 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
619 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
620 Opt_nouid32, Opt_check, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
621 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
622 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,
623 Opt_commit, Opt_journal_update, Opt_journal_inum,
624 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
625 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
626 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
627 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
628 Opt_grpquota
629 };
630
631 static match_table_t tokens = {
632 {Opt_bsd_df, "bsddf"},
633 {Opt_minix_df, "minixdf"},
634 {Opt_grpid, "grpid"},
635 {Opt_grpid, "bsdgroups"},
636 {Opt_nogrpid, "nogrpid"},
637 {Opt_nogrpid, "sysvgroups"},
638 {Opt_resgid, "resgid=%u"},
639 {Opt_resuid, "resuid=%u"},
640 {Opt_sb, "sb=%u"},
641 {Opt_err_cont, "errors=continue"},
642 {Opt_err_panic, "errors=panic"},
643 {Opt_err_ro, "errors=remount-ro"},
644 {Opt_nouid32, "nouid32"},
645 {Opt_nocheck, "nocheck"},
646 {Opt_nocheck, "check=none"},
647 {Opt_check, "check"},
648 {Opt_debug, "debug"},
649 {Opt_oldalloc, "oldalloc"},
650 {Opt_orlov, "orlov"},
651 {Opt_user_xattr, "user_xattr"},
652 {Opt_nouser_xattr, "nouser_xattr"},
653 {Opt_acl, "acl"},
654 {Opt_noacl, "noacl"},
655 {Opt_reservation, "reservation"},
656 {Opt_noreservation, "noreservation"},
657 {Opt_noload, "noload"},
658 {Opt_nobh, "nobh"},
659 {Opt_commit, "commit=%u"},
660 {Opt_journal_update, "journal=update"},
661 {Opt_journal_inum, "journal=%u"},
662 {Opt_abort, "abort"},
663 {Opt_data_journal, "data=journal"},
664 {Opt_data_ordered, "data=ordered"},
665 {Opt_data_writeback, "data=writeback"},
666 {Opt_offusrjquota, "usrjquota="},
667 {Opt_usrjquota, "usrjquota=%s"},
668 {Opt_offgrpjquota, "grpjquota="},
669 {Opt_grpjquota, "grpjquota=%s"},
670 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
671 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
672 {Opt_grpquota, "grpquota"},
673 {Opt_noquota, "noquota"},
674 {Opt_quota, "quota"},
675 {Opt_usrquota, "usrquota"},
676 {Opt_barrier, "barrier=%u"},
677 {Opt_err, NULL},
678 {Opt_resize, "resize"},
679 };
680
681 static unsigned long get_sb_block(void **data)
682 {
683 unsigned long sb_block;
684 char *options = (char *) *data;
685
686 if (!options || strncmp(options, "sb=", 3) != 0)
687 return 1; /* Default location */
688 options += 3;
689 sb_block = simple_strtoul(options, &options, 0);
690 if (*options && *options != ',') {
691 printk("EXT3-fs: Invalid sb specification: %s\n",
692 (char *) *data);
693 return 1;
694 }
695 if (*options == ',')
696 options++;
697 *data = (void *) options;
698 return sb_block;
699 }
700
701 static int parse_options (char * options, struct super_block *sb,
702 unsigned long * inum, unsigned long *n_blocks_count, int is_remount)
703 {
704 struct ext3_sb_info *sbi = EXT3_SB(sb);
705 char * p;
706 substring_t args[MAX_OPT_ARGS];
707 int data_opt = 0;
708 int option;
709 #ifdef CONFIG_QUOTA
710 int qtype;
711 char *qname;
712 #endif
713
714 if (!options)
715 return 1;
716
717 while ((p = strsep (&options, ",")) != NULL) {
718 int token;
719 if (!*p)
720 continue;
721
722 token = match_token(p, tokens, args);
723 switch (token) {
724 case Opt_bsd_df:
725 clear_opt (sbi->s_mount_opt, MINIX_DF);
726 break;
727 case Opt_minix_df:
728 set_opt (sbi->s_mount_opt, MINIX_DF);
729 break;
730 case Opt_grpid:
731 set_opt (sbi->s_mount_opt, GRPID);
732 break;
733 case Opt_nogrpid:
734 clear_opt (sbi->s_mount_opt, GRPID);
735 break;
736 case Opt_resuid:
737 if (match_int(&args[0], &option))
738 return 0;
739 sbi->s_resuid = option;
740 break;
741 case Opt_resgid:
742 if (match_int(&args[0], &option))
743 return 0;
744 sbi->s_resgid = option;
745 break;
746 case Opt_sb:
747 /* handled by get_sb_block() instead of here */
748 /* *sb_block = match_int(&args[0]); */
749 break;
750 case Opt_err_panic:
751 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
752 clear_opt (sbi->s_mount_opt, ERRORS_RO);
753 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
754 break;
755 case Opt_err_ro:
756 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
757 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
758 set_opt (sbi->s_mount_opt, ERRORS_RO);
759 break;
760 case Opt_err_cont:
761 clear_opt (sbi->s_mount_opt, ERRORS_RO);
762 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
763 set_opt (sbi->s_mount_opt, ERRORS_CONT);
764 break;
765 case Opt_nouid32:
766 set_opt (sbi->s_mount_opt, NO_UID32);
767 break;
768 case Opt_check:
769 #ifdef CONFIG_EXT3_CHECK
770 set_opt (sbi->s_mount_opt, CHECK);
771 #else
772 printk(KERN_ERR
773 "EXT3 Check option not supported\n");
774 #endif
775 break;
776 case Opt_nocheck:
777 clear_opt (sbi->s_mount_opt, CHECK);
778 break;
779 case Opt_debug:
780 set_opt (sbi->s_mount_opt, DEBUG);
781 break;
782 case Opt_oldalloc:
783 set_opt (sbi->s_mount_opt, OLDALLOC);
784 break;
785 case Opt_orlov:
786 clear_opt (sbi->s_mount_opt, OLDALLOC);
787 break;
788 #ifdef CONFIG_EXT3_FS_XATTR
789 case Opt_user_xattr:
790 set_opt (sbi->s_mount_opt, XATTR_USER);
791 break;
792 case Opt_nouser_xattr:
793 clear_opt (sbi->s_mount_opt, XATTR_USER);
794 break;
795 #else
796 case Opt_user_xattr:
797 case Opt_nouser_xattr:
798 printk("EXT3 (no)user_xattr options not supported\n");
799 break;
800 #endif
801 #ifdef CONFIG_EXT3_FS_POSIX_ACL
802 case Opt_acl:
803 set_opt(sbi->s_mount_opt, POSIX_ACL);
804 break;
805 case Opt_noacl:
806 clear_opt(sbi->s_mount_opt, POSIX_ACL);
807 break;
808 #else
809 case Opt_acl:
810 case Opt_noacl:
811 printk("EXT3 (no)acl options not supported\n");
812 break;
813 #endif
814 case Opt_reservation:
815 set_opt(sbi->s_mount_opt, RESERVATION);
816 break;
817 case Opt_noreservation:
818 clear_opt(sbi->s_mount_opt, RESERVATION);
819 break;
820 case Opt_journal_update:
821 /* @@@ FIXME */
822 /* Eventually we will want to be able to create
823 a journal file here. For now, only allow the
824 user to specify an existing inode to be the
825 journal file. */
826 if (is_remount) {
827 printk(KERN_ERR "EXT3-fs: cannot specify "
828 "journal on remount\n");
829 return 0;
830 }
831 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
832 break;
833 case Opt_journal_inum:
834 if (is_remount) {
835 printk(KERN_ERR "EXT3-fs: cannot specify "
836 "journal on remount\n");
837 return 0;
838 }
839 if (match_int(&args[0], &option))
840 return 0;
841 *inum = option;
842 break;
843 case Opt_noload:
844 set_opt (sbi->s_mount_opt, NOLOAD);
845 break;
846 case Opt_commit:
847 if (match_int(&args[0], &option))
848 return 0;
849 if (option < 0)
850 return 0;
851 if (option == 0)
852 option = JBD_DEFAULT_MAX_COMMIT_AGE;
853 sbi->s_commit_interval = HZ * option;
854 break;
855 case Opt_data_journal:
856 data_opt = EXT3_MOUNT_JOURNAL_DATA;
857 goto datacheck;
858 case Opt_data_ordered:
859 data_opt = EXT3_MOUNT_ORDERED_DATA;
860 goto datacheck;
861 case Opt_data_writeback:
862 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
863 datacheck:
864 if (is_remount) {
865 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
866 != data_opt) {
867 printk(KERN_ERR
868 "EXT3-fs: cannot change data "
869 "mode on remount\n");
870 return 0;
871 }
872 } else {
873 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
874 sbi->s_mount_opt |= data_opt;
875 }
876 break;
877 #ifdef CONFIG_QUOTA
878 case Opt_usrjquota:
879 qtype = USRQUOTA;
880 goto set_qf_name;
881 case Opt_grpjquota:
882 qtype = GRPQUOTA;
883 set_qf_name:
884 if (sb_any_quota_enabled(sb)) {
885 printk(KERN_ERR
886 "EXT3-fs: Cannot change journalled "
887 "quota options when quota turned on.\n");
888 return 0;
889 }
890 qname = match_strdup(&args[0]);
891 if (!qname) {
892 printk(KERN_ERR
893 "EXT3-fs: not enough memory for "
894 "storing quotafile name.\n");
895 return 0;
896 }
897 if (sbi->s_qf_names[qtype] &&
898 strcmp(sbi->s_qf_names[qtype], qname)) {
899 printk(KERN_ERR
900 "EXT3-fs: %s quota file already "
901 "specified.\n", QTYPE2NAME(qtype));
902 kfree(qname);
903 return 0;
904 }
905 sbi->s_qf_names[qtype] = qname;
906 if (strchr(sbi->s_qf_names[qtype], '/')) {
907 printk(KERN_ERR
908 "EXT3-fs: quotafile must be on "
909 "filesystem root.\n");
910 kfree(sbi->s_qf_names[qtype]);
911 sbi->s_qf_names[qtype] = NULL;
912 return 0;
913 }
914 set_opt(sbi->s_mount_opt, QUOTA);
915 break;
916 case Opt_offusrjquota:
917 qtype = USRQUOTA;
918 goto clear_qf_name;
919 case Opt_offgrpjquota:
920 qtype = GRPQUOTA;
921 clear_qf_name:
922 if (sb_any_quota_enabled(sb)) {
923 printk(KERN_ERR "EXT3-fs: Cannot change "
924 "journalled quota options when "
925 "quota turned on.\n");
926 return 0;
927 }
928 /*
929 * The space will be released later when all options
930 * are confirmed to be correct
931 */
932 sbi->s_qf_names[qtype] = NULL;
933 break;
934 case Opt_jqfmt_vfsold:
935 sbi->s_jquota_fmt = QFMT_VFS_OLD;
936 break;
937 case Opt_jqfmt_vfsv0:
938 sbi->s_jquota_fmt = QFMT_VFS_V0;
939 break;
940 case Opt_quota:
941 case Opt_usrquota:
942 set_opt(sbi->s_mount_opt, QUOTA);
943 set_opt(sbi->s_mount_opt, USRQUOTA);
944 break;
945 case Opt_grpquota:
946 set_opt(sbi->s_mount_opt, QUOTA);
947 set_opt(sbi->s_mount_opt, GRPQUOTA);
948 break;
949 case Opt_noquota:
950 if (sb_any_quota_enabled(sb)) {
951 printk(KERN_ERR "EXT3-fs: Cannot change quota "
952 "options when quota turned on.\n");
953 return 0;
954 }
955 clear_opt(sbi->s_mount_opt, QUOTA);
956 clear_opt(sbi->s_mount_opt, USRQUOTA);
957 clear_opt(sbi->s_mount_opt, GRPQUOTA);
958 break;
959 #else
960 case Opt_quota:
961 case Opt_usrquota:
962 case Opt_grpquota:
963 case Opt_usrjquota:
964 case Opt_grpjquota:
965 case Opt_offusrjquota:
966 case Opt_offgrpjquota:
967 case Opt_jqfmt_vfsold:
968 case Opt_jqfmt_vfsv0:
969 printk(KERN_ERR
970 "EXT3-fs: journalled quota options not "
971 "supported.\n");
972 break;
973 case Opt_noquota:
974 break;
975 #endif
976 case Opt_abort:
977 set_opt(sbi->s_mount_opt, ABORT);
978 break;
979 case Opt_barrier:
980 if (match_int(&args[0], &option))
981 return 0;
982 if (option)
983 set_opt(sbi->s_mount_opt, BARRIER);
984 else
985 clear_opt(sbi->s_mount_opt, BARRIER);
986 break;
987 case Opt_ignore:
988 break;
989 case Opt_resize:
990 if (!is_remount) {
991 printk("EXT3-fs: resize option only available "
992 "for remount\n");
993 return 0;
994 }
995 if (match_int(&args[0], &option) != 0)
996 return 0;
997 *n_blocks_count = option;
998 break;
999 case Opt_nobh:
1000 set_opt(sbi->s_mount_opt, NOBH);
1001 break;
1002 default:
1003 printk (KERN_ERR
1004 "EXT3-fs: Unrecognized mount option \"%s\" "
1005 "or missing value\n", p);
1006 return 0;
1007 }
1008 }
1009 #ifdef CONFIG_QUOTA
1010 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1011 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1012 sbi->s_qf_names[USRQUOTA])
1013 clear_opt(sbi->s_mount_opt, USRQUOTA);
1014
1015 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1016 sbi->s_qf_names[GRPQUOTA])
1017 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1018
1019 if ((sbi->s_qf_names[USRQUOTA] &&
1020 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1021 (sbi->s_qf_names[GRPQUOTA] &&
1022 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1023 printk(KERN_ERR "EXT3-fs: old and new quota "
1024 "format mixing.\n");
1025 return 0;
1026 }
1027
1028 if (!sbi->s_jquota_fmt) {
1029 printk(KERN_ERR "EXT3-fs: journalled quota format "
1030 "not specified.\n");
1031 return 0;
1032 }
1033 } else {
1034 if (sbi->s_jquota_fmt) {
1035 printk(KERN_ERR "EXT3-fs: journalled quota format "
1036 "specified with no journalling "
1037 "enabled.\n");
1038 return 0;
1039 }
1040 }
1041 #endif
1042 return 1;
1043 }
1044
1045 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1046 int read_only)
1047 {
1048 struct ext3_sb_info *sbi = EXT3_SB(sb);
1049 int res = 0;
1050
1051 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1052 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1053 "forcing read-only mode\n");
1054 res = MS_RDONLY;
1055 }
1056 if (read_only)
1057 return res;
1058 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1059 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1060 "running e2fsck is recommended\n");
1061 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1062 printk (KERN_WARNING
1063 "EXT3-fs warning: mounting fs with errors, "
1064 "running e2fsck is recommended\n");
1065 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1066 le16_to_cpu(es->s_mnt_count) >=
1067 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1068 printk (KERN_WARNING
1069 "EXT3-fs warning: maximal mount count reached, "
1070 "running e2fsck is recommended\n");
1071 else if (le32_to_cpu(es->s_checkinterval) &&
1072 (le32_to_cpu(es->s_lastcheck) +
1073 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1074 printk (KERN_WARNING
1075 "EXT3-fs warning: checktime reached, "
1076 "running e2fsck is recommended\n");
1077 #if 0
1078 /* @@@ We _will_ want to clear the valid bit if we find
1079 inconsistencies, to force a fsck at reboot. But for
1080 a plain journaled filesystem we can keep it set as
1081 valid forever! :) */
1082 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1083 #endif
1084 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1085 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1086 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1087 es->s_mtime = cpu_to_le32(get_seconds());
1088 ext3_update_dynamic_rev(sb);
1089 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1090
1091 ext3_commit_super(sb, es, 1);
1092 if (test_opt(sb, DEBUG))
1093 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1094 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1095 sb->s_blocksize,
1096 sbi->s_groups_count,
1097 EXT3_BLOCKS_PER_GROUP(sb),
1098 EXT3_INODES_PER_GROUP(sb),
1099 sbi->s_mount_opt);
1100
1101 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1102 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1103 char b[BDEVNAME_SIZE];
1104
1105 printk("external journal on %s\n",
1106 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1107 } else {
1108 printk("internal journal\n");
1109 }
1110 #ifdef CONFIG_EXT3_CHECK
1111 if (test_opt (sb, CHECK)) {
1112 ext3_check_blocks_bitmap (sb);
1113 ext3_check_inodes_bitmap (sb);
1114 }
1115 #endif
1116 return res;
1117 }
1118
1119 /* Called at mount-time, super-block is locked */
1120 static int ext3_check_descriptors (struct super_block * sb)
1121 {
1122 struct ext3_sb_info *sbi = EXT3_SB(sb);
1123 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1124 struct ext3_group_desc * gdp = NULL;
1125 int desc_block = 0;
1126 int i;
1127
1128 ext3_debug ("Checking group descriptors");
1129
1130 for (i = 0; i < sbi->s_groups_count; i++)
1131 {
1132 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1133 gdp = (struct ext3_group_desc *)
1134 sbi->s_group_desc[desc_block++]->b_data;
1135 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1136 le32_to_cpu(gdp->bg_block_bitmap) >=
1137 block + EXT3_BLOCKS_PER_GROUP(sb))
1138 {
1139 ext3_error (sb, "ext3_check_descriptors",
1140 "Block bitmap for group %d"
1141 " not in group (block %lu)!",
1142 i, (unsigned long)
1143 le32_to_cpu(gdp->bg_block_bitmap));
1144 return 0;
1145 }
1146 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1147 le32_to_cpu(gdp->bg_inode_bitmap) >=
1148 block + EXT3_BLOCKS_PER_GROUP(sb))
1149 {
1150 ext3_error (sb, "ext3_check_descriptors",
1151 "Inode bitmap for group %d"
1152 " not in group (block %lu)!",
1153 i, (unsigned long)
1154 le32_to_cpu(gdp->bg_inode_bitmap));
1155 return 0;
1156 }
1157 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1158 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1159 block + EXT3_BLOCKS_PER_GROUP(sb))
1160 {
1161 ext3_error (sb, "ext3_check_descriptors",
1162 "Inode table for group %d"
1163 " not in group (block %lu)!",
1164 i, (unsigned long)
1165 le32_to_cpu(gdp->bg_inode_table));
1166 return 0;
1167 }
1168 block += EXT3_BLOCKS_PER_GROUP(sb);
1169 gdp++;
1170 }
1171
1172 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1173 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1174 return 1;
1175 }
1176
1177
1178 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1179 * the superblock) which were deleted from all directories, but held open by
1180 * a process at the time of a crash. We walk the list and try to delete these
1181 * inodes at recovery time (only with a read-write filesystem).
1182 *
1183 * In order to keep the orphan inode chain consistent during traversal (in
1184 * case of crash during recovery), we link each inode into the superblock
1185 * orphan list_head and handle it the same way as an inode deletion during
1186 * normal operation (which journals the operations for us).
1187 *
1188 * We only do an iget() and an iput() on each inode, which is very safe if we
1189 * accidentally point at an in-use or already deleted inode. The worst that
1190 * can happen in this case is that we get a "bit already cleared" message from
1191 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1192 * e2fsck was run on this filesystem, and it must have already done the orphan
1193 * inode cleanup for us, so we can safely abort without any further action.
1194 */
1195 static void ext3_orphan_cleanup (struct super_block * sb,
1196 struct ext3_super_block * es)
1197 {
1198 unsigned int s_flags = sb->s_flags;
1199 int nr_orphans = 0, nr_truncates = 0;
1200 #ifdef CONFIG_QUOTA
1201 int i;
1202 #endif
1203 if (!es->s_last_orphan) {
1204 jbd_debug(4, "no orphan inodes to clean up\n");
1205 return;
1206 }
1207
1208 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1209 if (es->s_last_orphan)
1210 jbd_debug(1, "Errors on filesystem, "
1211 "clearing orphan list.\n");
1212 es->s_last_orphan = 0;
1213 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1214 return;
1215 }
1216
1217 if (s_flags & MS_RDONLY) {
1218 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1219 sb->s_id);
1220 sb->s_flags &= ~MS_RDONLY;
1221 }
1222 #ifdef CONFIG_QUOTA
1223 /* Needed for iput() to work correctly and not trash data */
1224 sb->s_flags |= MS_ACTIVE;
1225 /* Turn on quotas so that they are updated correctly */
1226 for (i = 0; i < MAXQUOTAS; i++) {
1227 if (EXT3_SB(sb)->s_qf_names[i]) {
1228 int ret = ext3_quota_on_mount(sb, i);
1229 if (ret < 0)
1230 printk(KERN_ERR
1231 "EXT3-fs: Cannot turn on journalled "
1232 "quota: error %d\n", ret);
1233 }
1234 }
1235 #endif
1236
1237 while (es->s_last_orphan) {
1238 struct inode *inode;
1239
1240 if (!(inode =
1241 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1242 es->s_last_orphan = 0;
1243 break;
1244 }
1245
1246 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1247 DQUOT_INIT(inode);
1248 if (inode->i_nlink) {
1249 printk(KERN_DEBUG
1250 "%s: truncating inode %ld to %Ld bytes\n",
1251 __FUNCTION__, inode->i_ino, inode->i_size);
1252 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1253 inode->i_ino, inode->i_size);
1254 ext3_truncate(inode);
1255 nr_truncates++;
1256 } else {
1257 printk(KERN_DEBUG
1258 "%s: deleting unreferenced inode %ld\n",
1259 __FUNCTION__, inode->i_ino);
1260 jbd_debug(2, "deleting unreferenced inode %ld\n",
1261 inode->i_ino);
1262 nr_orphans++;
1263 }
1264 iput(inode); /* The delete magic happens here! */
1265 }
1266
1267 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1268
1269 if (nr_orphans)
1270 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1271 sb->s_id, PLURAL(nr_orphans));
1272 if (nr_truncates)
1273 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1274 sb->s_id, PLURAL(nr_truncates));
1275 #ifdef CONFIG_QUOTA
1276 /* Turn quotas off */
1277 for (i = 0; i < MAXQUOTAS; i++) {
1278 if (sb_dqopt(sb)->files[i])
1279 vfs_quota_off(sb, i);
1280 }
1281 #endif
1282 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1283 }
1284
1285 #define log2(n) ffz(~(n))
1286
1287 /*
1288 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1289 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1290 * We need to be 1 filesystem block less than the 2^32 sector limit.
1291 */
1292 static loff_t ext3_max_size(int bits)
1293 {
1294 loff_t res = EXT3_NDIR_BLOCKS;
1295 /* This constant is calculated to be the largest file size for a
1296 * dense, 4k-blocksize file such that the total number of
1297 * sectors in the file, including data and all indirect blocks,
1298 * does not exceed 2^32. */
1299 const loff_t upper_limit = 0x1ff7fffd000LL;
1300
1301 res += 1LL << (bits-2);
1302 res += 1LL << (2*(bits-2));
1303 res += 1LL << (3*(bits-2));
1304 res <<= bits;
1305 if (res > upper_limit)
1306 res = upper_limit;
1307 return res;
1308 }
1309
1310 static unsigned long descriptor_loc(struct super_block *sb,
1311 unsigned long logic_sb_block,
1312 int nr)
1313 {
1314 struct ext3_sb_info *sbi = EXT3_SB(sb);
1315 unsigned long bg, first_data_block, first_meta_bg;
1316 int has_super = 0;
1317
1318 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1319 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1320
1321 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1322 nr < first_meta_bg)
1323 return (logic_sb_block + nr + 1);
1324 bg = sbi->s_desc_per_block * nr;
1325 if (ext3_bg_has_super(sb, bg))
1326 has_super = 1;
1327 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1328 }
1329
1330
1331 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1332 {
1333 struct buffer_head * bh;
1334 struct ext3_super_block *es = NULL;
1335 struct ext3_sb_info *sbi;
1336 unsigned long block;
1337 unsigned long sb_block = get_sb_block(&data);
1338 unsigned long logic_sb_block;
1339 unsigned long offset = 0;
1340 unsigned long journal_inum = 0;
1341 unsigned long def_mount_opts;
1342 struct inode *root;
1343 int blocksize;
1344 int hblock;
1345 int db_count;
1346 int i;
1347 int needs_recovery;
1348 __le32 features;
1349
1350 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1351 if (!sbi)
1352 return -ENOMEM;
1353 sb->s_fs_info = sbi;
1354 memset(sbi, 0, sizeof(*sbi));
1355 sbi->s_mount_opt = 0;
1356 sbi->s_resuid = EXT3_DEF_RESUID;
1357 sbi->s_resgid = EXT3_DEF_RESGID;
1358
1359 unlock_kernel();
1360
1361 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1362 if (!blocksize) {
1363 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1364 goto out_fail;
1365 }
1366
1367 /*
1368 * The ext3 superblock will not be buffer aligned for other than 1kB
1369 * block sizes. We need to calculate the offset from buffer start.
1370 */
1371 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1372 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1373 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1374 } else {
1375 logic_sb_block = sb_block;
1376 }
1377
1378 if (!(bh = sb_bread(sb, logic_sb_block))) {
1379 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1380 goto out_fail;
1381 }
1382 /*
1383 * Note: s_es must be initialized as soon as possible because
1384 * some ext3 macro-instructions depend on its value
1385 */
1386 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1387 sbi->s_es = es;
1388 sb->s_magic = le16_to_cpu(es->s_magic);
1389 if (sb->s_magic != EXT3_SUPER_MAGIC)
1390 goto cantfind_ext3;
1391
1392 /* Set defaults before we parse the mount options */
1393 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1394 if (def_mount_opts & EXT3_DEFM_DEBUG)
1395 set_opt(sbi->s_mount_opt, DEBUG);
1396 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1397 set_opt(sbi->s_mount_opt, GRPID);
1398 if (def_mount_opts & EXT3_DEFM_UID16)
1399 set_opt(sbi->s_mount_opt, NO_UID32);
1400 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1401 set_opt(sbi->s_mount_opt, XATTR_USER);
1402 if (def_mount_opts & EXT3_DEFM_ACL)
1403 set_opt(sbi->s_mount_opt, POSIX_ACL);
1404 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1405 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1406 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1407 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1408 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1409 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1410
1411 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1412 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1413 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1414 set_opt(sbi->s_mount_opt, ERRORS_RO);
1415
1416 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1417 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1418
1419 set_opt(sbi->s_mount_opt, RESERVATION);
1420
1421 if (!parse_options ((char *) data, sb, &journal_inum, NULL, 0))
1422 goto failed_mount;
1423
1424 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1425 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1426
1427 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1428 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1429 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1430 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1431 printk(KERN_WARNING
1432 "EXT3-fs warning: feature flags set on rev 0 fs, "
1433 "running e2fsck is recommended\n");
1434 /*
1435 * Check feature flags regardless of the revision level, since we
1436 * previously didn't change the revision level when setting the flags,
1437 * so there is a chance incompat flags are set on a rev 0 filesystem.
1438 */
1439 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1440 if (features) {
1441 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1442 "unsupported optional features (%x).\n",
1443 sb->s_id, le32_to_cpu(features));
1444 goto failed_mount;
1445 }
1446 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1447 if (!(sb->s_flags & MS_RDONLY) && features) {
1448 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1449 "unsupported optional features (%x).\n",
1450 sb->s_id, le32_to_cpu(features));
1451 goto failed_mount;
1452 }
1453 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1454
1455 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1456 blocksize > EXT3_MAX_BLOCK_SIZE) {
1457 printk(KERN_ERR
1458 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1459 blocksize, sb->s_id);
1460 goto failed_mount;
1461 }
1462
1463 hblock = bdev_hardsect_size(sb->s_bdev);
1464 if (sb->s_blocksize != blocksize) {
1465 /*
1466 * Make sure the blocksize for the filesystem is larger
1467 * than the hardware sectorsize for the machine.
1468 */
1469 if (blocksize < hblock) {
1470 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1471 "device blocksize %d.\n", blocksize, hblock);
1472 goto failed_mount;
1473 }
1474
1475 brelse (bh);
1476 sb_set_blocksize(sb, blocksize);
1477 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1478 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1479 bh = sb_bread(sb, logic_sb_block);
1480 if (!bh) {
1481 printk(KERN_ERR
1482 "EXT3-fs: Can't read superblock on 2nd try.\n");
1483 goto failed_mount;
1484 }
1485 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1486 sbi->s_es = es;
1487 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1488 printk (KERN_ERR
1489 "EXT3-fs: Magic mismatch, very weird !\n");
1490 goto failed_mount;
1491 }
1492 }
1493
1494 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1495
1496 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1497 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1498 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1499 } else {
1500 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1501 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1502 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1503 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1504 (sbi->s_inode_size > blocksize)) {
1505 printk (KERN_ERR
1506 "EXT3-fs: unsupported inode size: %d\n",
1507 sbi->s_inode_size);
1508 goto failed_mount;
1509 }
1510 }
1511 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1512 le32_to_cpu(es->s_log_frag_size);
1513 if (blocksize != sbi->s_frag_size) {
1514 printk(KERN_ERR
1515 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1516 sbi->s_frag_size, blocksize);
1517 goto failed_mount;
1518 }
1519 sbi->s_frags_per_block = 1;
1520 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1521 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1522 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1523 if (EXT3_INODE_SIZE(sb) == 0)
1524 goto cantfind_ext3;
1525 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1526 if (sbi->s_inodes_per_block == 0)
1527 goto cantfind_ext3;
1528 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1529 sbi->s_inodes_per_block;
1530 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1531 sbi->s_sbh = bh;
1532 sbi->s_mount_state = le16_to_cpu(es->s_state);
1533 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1534 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1535 for (i=0; i < 4; i++)
1536 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1537 sbi->s_def_hash_version = es->s_def_hash_version;
1538
1539 if (sbi->s_blocks_per_group > blocksize * 8) {
1540 printk (KERN_ERR
1541 "EXT3-fs: #blocks per group too big: %lu\n",
1542 sbi->s_blocks_per_group);
1543 goto failed_mount;
1544 }
1545 if (sbi->s_frags_per_group > blocksize * 8) {
1546 printk (KERN_ERR
1547 "EXT3-fs: #fragments per group too big: %lu\n",
1548 sbi->s_frags_per_group);
1549 goto failed_mount;
1550 }
1551 if (sbi->s_inodes_per_group > blocksize * 8) {
1552 printk (KERN_ERR
1553 "EXT3-fs: #inodes per group too big: %lu\n",
1554 sbi->s_inodes_per_group);
1555 goto failed_mount;
1556 }
1557
1558 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1559 goto cantfind_ext3;
1560 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1561 le32_to_cpu(es->s_first_data_block) +
1562 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1563 EXT3_BLOCKS_PER_GROUP(sb);
1564 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1565 EXT3_DESC_PER_BLOCK(sb);
1566 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1567 GFP_KERNEL);
1568 if (sbi->s_group_desc == NULL) {
1569 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1570 goto failed_mount;
1571 }
1572
1573 percpu_counter_init(&sbi->s_freeblocks_counter);
1574 percpu_counter_init(&sbi->s_freeinodes_counter);
1575 percpu_counter_init(&sbi->s_dirs_counter);
1576 bgl_lock_init(&sbi->s_blockgroup_lock);
1577
1578 for (i = 0; i < db_count; i++) {
1579 block = descriptor_loc(sb, logic_sb_block, i);
1580 sbi->s_group_desc[i] = sb_bread(sb, block);
1581 if (!sbi->s_group_desc[i]) {
1582 printk (KERN_ERR "EXT3-fs: "
1583 "can't read group descriptor %d\n", i);
1584 db_count = i;
1585 goto failed_mount2;
1586 }
1587 }
1588 if (!ext3_check_descriptors (sb)) {
1589 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1590 goto failed_mount2;
1591 }
1592 sbi->s_gdb_count = db_count;
1593 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1594 spin_lock_init(&sbi->s_next_gen_lock);
1595 /* per fileystem reservation list head & lock */
1596 spin_lock_init(&sbi->s_rsv_window_lock);
1597 sbi->s_rsv_window_root = RB_ROOT;
1598 /* Add a single, static dummy reservation to the start of the
1599 * reservation window list --- it gives us a placeholder for
1600 * append-at-start-of-list which makes the allocation logic
1601 * _much_ simpler. */
1602 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1603 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1604 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1605 sbi->s_rsv_window_head.rsv_goal_size = 0;
1606 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1607
1608 /*
1609 * set up enough so that it can read an inode
1610 */
1611 sb->s_op = &ext3_sops;
1612 sb->s_export_op = &ext3_export_ops;
1613 sb->s_xattr = ext3_xattr_handlers;
1614 #ifdef CONFIG_QUOTA
1615 sb->s_qcop = &ext3_qctl_operations;
1616 sb->dq_op = &ext3_quota_operations;
1617 #endif
1618 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1619
1620 sb->s_root = NULL;
1621
1622 needs_recovery = (es->s_last_orphan != 0 ||
1623 EXT3_HAS_INCOMPAT_FEATURE(sb,
1624 EXT3_FEATURE_INCOMPAT_RECOVER));
1625
1626 /*
1627 * The first inode we look at is the journal inode. Don't try
1628 * root first: it may be modified in the journal!
1629 */
1630 if (!test_opt(sb, NOLOAD) &&
1631 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1632 if (ext3_load_journal(sb, es))
1633 goto failed_mount2;
1634 } else if (journal_inum) {
1635 if (ext3_create_journal(sb, es, journal_inum))
1636 goto failed_mount2;
1637 } else {
1638 if (!silent)
1639 printk (KERN_ERR
1640 "ext3: No journal on filesystem on %s\n",
1641 sb->s_id);
1642 goto failed_mount2;
1643 }
1644
1645 /* We have now updated the journal if required, so we can
1646 * validate the data journaling mode. */
1647 switch (test_opt(sb, DATA_FLAGS)) {
1648 case 0:
1649 /* No mode set, assume a default based on the journal
1650 capabilities: ORDERED_DATA if the journal can
1651 cope, else JOURNAL_DATA */
1652 if (journal_check_available_features
1653 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1654 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1655 else
1656 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1657 break;
1658
1659 case EXT3_MOUNT_ORDERED_DATA:
1660 case EXT3_MOUNT_WRITEBACK_DATA:
1661 if (!journal_check_available_features
1662 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1663 printk(KERN_ERR "EXT3-fs: Journal does not support "
1664 "requested data journaling mode\n");
1665 goto failed_mount3;
1666 }
1667 default:
1668 break;
1669 }
1670
1671 if (test_opt(sb, NOBH)) {
1672 if (sb->s_blocksize_bits != PAGE_CACHE_SHIFT) {
1673 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option "
1674 "since filesystem blocksize doesn't match "
1675 "pagesize\n");
1676 clear_opt(sbi->s_mount_opt, NOBH);
1677 }
1678 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1679 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1680 "its supported only with writeback mode\n");
1681 clear_opt(sbi->s_mount_opt, NOBH);
1682 }
1683 }
1684 /*
1685 * The journal_load will have done any necessary log recovery,
1686 * so we can safely mount the rest of the filesystem now.
1687 */
1688
1689 root = iget(sb, EXT3_ROOT_INO);
1690 sb->s_root = d_alloc_root(root);
1691 if (!sb->s_root) {
1692 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1693 iput(root);
1694 goto failed_mount3;
1695 }
1696 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1697 dput(sb->s_root);
1698 sb->s_root = NULL;
1699 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1700 goto failed_mount3;
1701 }
1702
1703 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1704 /*
1705 * akpm: core read_super() calls in here with the superblock locked.
1706 * That deadlocks, because orphan cleanup needs to lock the superblock
1707 * in numerous places. Here we just pop the lock - it's relatively
1708 * harmless, because we are now ready to accept write_super() requests,
1709 * and aviro says that's the only reason for hanging onto the
1710 * superblock lock.
1711 */
1712 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1713 ext3_orphan_cleanup(sb, es);
1714 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1715 if (needs_recovery)
1716 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1717 ext3_mark_recovery_complete(sb, es);
1718 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1719 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1720 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1721 "writeback");
1722
1723 percpu_counter_mod(&sbi->s_freeblocks_counter,
1724 ext3_count_free_blocks(sb));
1725 percpu_counter_mod(&sbi->s_freeinodes_counter,
1726 ext3_count_free_inodes(sb));
1727 percpu_counter_mod(&sbi->s_dirs_counter,
1728 ext3_count_dirs(sb));
1729
1730 lock_kernel();
1731 return 0;
1732
1733 cantfind_ext3:
1734 if (!silent)
1735 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1736 sb->s_id);
1737 goto failed_mount;
1738
1739 failed_mount3:
1740 journal_destroy(sbi->s_journal);
1741 failed_mount2:
1742 for (i = 0; i < db_count; i++)
1743 brelse(sbi->s_group_desc[i]);
1744 kfree(sbi->s_group_desc);
1745 failed_mount:
1746 #ifdef CONFIG_QUOTA
1747 for (i = 0; i < MAXQUOTAS; i++)
1748 kfree(sbi->s_qf_names[i]);
1749 #endif
1750 ext3_blkdev_remove(sbi);
1751 brelse(bh);
1752 out_fail:
1753 sb->s_fs_info = NULL;
1754 kfree(sbi);
1755 lock_kernel();
1756 return -EINVAL;
1757 }
1758
1759 /*
1760 * Setup any per-fs journal parameters now. We'll do this both on
1761 * initial mount, once the journal has been initialised but before we've
1762 * done any recovery; and again on any subsequent remount.
1763 */
1764 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1765 {
1766 struct ext3_sb_info *sbi = EXT3_SB(sb);
1767
1768 if (sbi->s_commit_interval)
1769 journal->j_commit_interval = sbi->s_commit_interval;
1770 /* We could also set up an ext3-specific default for the commit
1771 * interval here, but for now we'll just fall back to the jbd
1772 * default. */
1773
1774 spin_lock(&journal->j_state_lock);
1775 if (test_opt(sb, BARRIER))
1776 journal->j_flags |= JFS_BARRIER;
1777 else
1778 journal->j_flags &= ~JFS_BARRIER;
1779 spin_unlock(&journal->j_state_lock);
1780 }
1781
1782 static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1783 {
1784 struct inode *journal_inode;
1785 journal_t *journal;
1786
1787 /* First, test for the existence of a valid inode on disk. Bad
1788 * things happen if we iget() an unused inode, as the subsequent
1789 * iput() will try to delete it. */
1790
1791 journal_inode = iget(sb, journal_inum);
1792 if (!journal_inode) {
1793 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1794 return NULL;
1795 }
1796 if (!journal_inode->i_nlink) {
1797 make_bad_inode(journal_inode);
1798 iput(journal_inode);
1799 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1800 return NULL;
1801 }
1802
1803 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1804 journal_inode, journal_inode->i_size);
1805 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1806 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1807 iput(journal_inode);
1808 return NULL;
1809 }
1810
1811 journal = journal_init_inode(journal_inode);
1812 if (!journal) {
1813 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1814 iput(journal_inode);
1815 return NULL;
1816 }
1817 journal->j_private = sb;
1818 ext3_init_journal_params(sb, journal);
1819 return journal;
1820 }
1821
1822 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1823 dev_t j_dev)
1824 {
1825 struct buffer_head * bh;
1826 journal_t *journal;
1827 int start;
1828 int len;
1829 int hblock, blocksize;
1830 unsigned long sb_block;
1831 unsigned long offset;
1832 struct ext3_super_block * es;
1833 struct block_device *bdev;
1834
1835 bdev = ext3_blkdev_get(j_dev);
1836 if (bdev == NULL)
1837 return NULL;
1838
1839 if (bd_claim(bdev, sb)) {
1840 printk(KERN_ERR
1841 "EXT3: failed to claim external journal device.\n");
1842 blkdev_put(bdev);
1843 return NULL;
1844 }
1845
1846 blocksize = sb->s_blocksize;
1847 hblock = bdev_hardsect_size(bdev);
1848 if (blocksize < hblock) {
1849 printk(KERN_ERR
1850 "EXT3-fs: blocksize too small for journal device.\n");
1851 goto out_bdev;
1852 }
1853
1854 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1855 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1856 set_blocksize(bdev, blocksize);
1857 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1858 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1859 "external journal\n");
1860 goto out_bdev;
1861 }
1862
1863 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1864 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1865 !(le32_to_cpu(es->s_feature_incompat) &
1866 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1867 printk(KERN_ERR "EXT3-fs: external journal has "
1868 "bad superblock\n");
1869 brelse(bh);
1870 goto out_bdev;
1871 }
1872
1873 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1874 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1875 brelse(bh);
1876 goto out_bdev;
1877 }
1878
1879 len = le32_to_cpu(es->s_blocks_count);
1880 start = sb_block + 1;
1881 brelse(bh); /* we're done with the superblock */
1882
1883 journal = journal_init_dev(bdev, sb->s_bdev,
1884 start, len, blocksize);
1885 if (!journal) {
1886 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1887 goto out_bdev;
1888 }
1889 journal->j_private = sb;
1890 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1891 wait_on_buffer(journal->j_sb_buffer);
1892 if (!buffer_uptodate(journal->j_sb_buffer)) {
1893 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1894 goto out_journal;
1895 }
1896 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1897 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1898 "user (unsupported) - %d\n",
1899 be32_to_cpu(journal->j_superblock->s_nr_users));
1900 goto out_journal;
1901 }
1902 EXT3_SB(sb)->journal_bdev = bdev;
1903 ext3_init_journal_params(sb, journal);
1904 return journal;
1905 out_journal:
1906 journal_destroy(journal);
1907 out_bdev:
1908 ext3_blkdev_put(bdev);
1909 return NULL;
1910 }
1911
1912 static int ext3_load_journal(struct super_block * sb,
1913 struct ext3_super_block * es)
1914 {
1915 journal_t *journal;
1916 int journal_inum = le32_to_cpu(es->s_journal_inum);
1917 dev_t journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1918 int err = 0;
1919 int really_read_only;
1920
1921 really_read_only = bdev_read_only(sb->s_bdev);
1922
1923 /*
1924 * Are we loading a blank journal or performing recovery after a
1925 * crash? For recovery, we need to check in advance whether we
1926 * can get read-write access to the device.
1927 */
1928
1929 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1930 if (sb->s_flags & MS_RDONLY) {
1931 printk(KERN_INFO "EXT3-fs: INFO: recovery "
1932 "required on readonly filesystem.\n");
1933 if (really_read_only) {
1934 printk(KERN_ERR "EXT3-fs: write access "
1935 "unavailable, cannot proceed.\n");
1936 return -EROFS;
1937 }
1938 printk (KERN_INFO "EXT3-fs: write access will "
1939 "be enabled during recovery.\n");
1940 }
1941 }
1942
1943 if (journal_inum && journal_dev) {
1944 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1945 "and inode journals!\n");
1946 return -EINVAL;
1947 }
1948
1949 if (journal_inum) {
1950 if (!(journal = ext3_get_journal(sb, journal_inum)))
1951 return -EINVAL;
1952 } else {
1953 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1954 return -EINVAL;
1955 }
1956
1957 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1958 err = journal_update_format(journal);
1959 if (err) {
1960 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1961 journal_destroy(journal);
1962 return err;
1963 }
1964 }
1965
1966 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1967 err = journal_wipe(journal, !really_read_only);
1968 if (!err)
1969 err = journal_load(journal);
1970
1971 if (err) {
1972 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
1973 journal_destroy(journal);
1974 return err;
1975 }
1976
1977 EXT3_SB(sb)->s_journal = journal;
1978 ext3_clear_journal_err(sb, es);
1979 return 0;
1980 }
1981
1982 static int ext3_create_journal(struct super_block * sb,
1983 struct ext3_super_block * es,
1984 int journal_inum)
1985 {
1986 journal_t *journal;
1987
1988 if (sb->s_flags & MS_RDONLY) {
1989 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
1990 "create journal.\n");
1991 return -EROFS;
1992 }
1993
1994 if (!(journal = ext3_get_journal(sb, journal_inum)))
1995 return -EINVAL;
1996
1997 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
1998 journal_inum);
1999
2000 if (journal_create(journal)) {
2001 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2002 journal_destroy(journal);
2003 return -EIO;
2004 }
2005
2006 EXT3_SB(sb)->s_journal = journal;
2007
2008 ext3_update_dynamic_rev(sb);
2009 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2010 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2011
2012 es->s_journal_inum = cpu_to_le32(journal_inum);
2013 sb->s_dirt = 1;
2014
2015 /* Make sure we flush the recovery flag to disk. */
2016 ext3_commit_super(sb, es, 1);
2017
2018 return 0;
2019 }
2020
2021 static void ext3_commit_super (struct super_block * sb,
2022 struct ext3_super_block * es,
2023 int sync)
2024 {
2025 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2026
2027 if (!sbh)
2028 return;
2029 es->s_wtime = cpu_to_le32(get_seconds());
2030 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2031 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2032 BUFFER_TRACE(sbh, "marking dirty");
2033 mark_buffer_dirty(sbh);
2034 if (sync)
2035 sync_dirty_buffer(sbh);
2036 }
2037
2038
2039 /*
2040 * Have we just finished recovery? If so, and if we are mounting (or
2041 * remounting) the filesystem readonly, then we will end up with a
2042 * consistent fs on disk. Record that fact.
2043 */
2044 static void ext3_mark_recovery_complete(struct super_block * sb,
2045 struct ext3_super_block * es)
2046 {
2047 journal_t *journal = EXT3_SB(sb)->s_journal;
2048
2049 journal_lock_updates(journal);
2050 journal_flush(journal);
2051 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2052 sb->s_flags & MS_RDONLY) {
2053 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2054 sb->s_dirt = 0;
2055 ext3_commit_super(sb, es, 1);
2056 }
2057 journal_unlock_updates(journal);
2058 }
2059
2060 /*
2061 * If we are mounting (or read-write remounting) a filesystem whose journal
2062 * has recorded an error from a previous lifetime, move that error to the
2063 * main filesystem now.
2064 */
2065 static void ext3_clear_journal_err(struct super_block * sb,
2066 struct ext3_super_block * es)
2067 {
2068 journal_t *journal;
2069 int j_errno;
2070 const char *errstr;
2071
2072 journal = EXT3_SB(sb)->s_journal;
2073
2074 /*
2075 * Now check for any error status which may have been recorded in the
2076 * journal by a prior ext3_error() or ext3_abort()
2077 */
2078
2079 j_errno = journal_errno(journal);
2080 if (j_errno) {
2081 char nbuf[16];
2082
2083 errstr = ext3_decode_error(sb, j_errno, nbuf);
2084 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2085 "from previous mount: %s", errstr);
2086 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2087 "filesystem check.");
2088
2089 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2090 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2091 ext3_commit_super (sb, es, 1);
2092
2093 journal_clear_err(journal);
2094 }
2095 }
2096
2097 /*
2098 * Force the running and committing transactions to commit,
2099 * and wait on the commit.
2100 */
2101 int ext3_force_commit(struct super_block *sb)
2102 {
2103 journal_t *journal;
2104 int ret;
2105
2106 if (sb->s_flags & MS_RDONLY)
2107 return 0;
2108
2109 journal = EXT3_SB(sb)->s_journal;
2110 sb->s_dirt = 0;
2111 ret = ext3_journal_force_commit(journal);
2112 return ret;
2113 }
2114
2115 /*
2116 * Ext3 always journals updates to the superblock itself, so we don't
2117 * have to propagate any other updates to the superblock on disk at this
2118 * point. Just start an async writeback to get the buffers on their way
2119 * to the disk.
2120 *
2121 * This implicitly triggers the writebehind on sync().
2122 */
2123
2124 static void ext3_write_super (struct super_block * sb)
2125 {
2126 if (down_trylock(&sb->s_lock) == 0)
2127 BUG();
2128 sb->s_dirt = 0;
2129 }
2130
2131 static int ext3_sync_fs(struct super_block *sb, int wait)
2132 {
2133 tid_t target;
2134
2135 sb->s_dirt = 0;
2136 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2137 if (wait)
2138 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2139 }
2140 return 0;
2141 }
2142
2143 /*
2144 * LVM calls this function before a (read-only) snapshot is created. This
2145 * gives us a chance to flush the journal completely and mark the fs clean.
2146 */
2147 static void ext3_write_super_lockfs(struct super_block *sb)
2148 {
2149 sb->s_dirt = 0;
2150
2151 if (!(sb->s_flags & MS_RDONLY)) {
2152 journal_t *journal = EXT3_SB(sb)->s_journal;
2153
2154 /* Now we set up the journal barrier. */
2155 journal_lock_updates(journal);
2156 journal_flush(journal);
2157
2158 /* Journal blocked and flushed, clear needs_recovery flag. */
2159 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2160 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2161 }
2162 }
2163
2164 /*
2165 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2166 * flag here, even though the filesystem is not technically dirty yet.
2167 */
2168 static void ext3_unlockfs(struct super_block *sb)
2169 {
2170 if (!(sb->s_flags & MS_RDONLY)) {
2171 lock_super(sb);
2172 /* Reser the needs_recovery flag before the fs is unlocked. */
2173 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2174 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2175 unlock_super(sb);
2176 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2177 }
2178 }
2179
2180 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2181 {
2182 struct ext3_super_block * es;
2183 struct ext3_sb_info *sbi = EXT3_SB(sb);
2184 unsigned long n_blocks_count = 0;
2185 unsigned long old_sb_flags;
2186 struct ext3_mount_options old_opts;
2187 int err;
2188 #ifdef CONFIG_QUOTA
2189 int i;
2190 #endif
2191
2192 /* Store the original options */
2193 old_sb_flags = sb->s_flags;
2194 old_opts.s_mount_opt = sbi->s_mount_opt;
2195 old_opts.s_resuid = sbi->s_resuid;
2196 old_opts.s_resgid = sbi->s_resgid;
2197 old_opts.s_commit_interval = sbi->s_commit_interval;
2198 #ifdef CONFIG_QUOTA
2199 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2200 for (i = 0; i < MAXQUOTAS; i++)
2201 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2202 #endif
2203
2204 /*
2205 * Allow the "check" option to be passed as a remount option.
2206 */
2207 if (!parse_options(data, sb, NULL, &n_blocks_count, 1)) {
2208 err = -EINVAL;
2209 goto restore_opts;
2210 }
2211
2212 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2213 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2214
2215 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2216 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2217
2218 es = sbi->s_es;
2219
2220 ext3_init_journal_params(sb, sbi->s_journal);
2221
2222 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2223 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2224 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2225 err = -EROFS;
2226 goto restore_opts;
2227 }
2228
2229 if (*flags & MS_RDONLY) {
2230 /*
2231 * First of all, the unconditional stuff we have to do
2232 * to disable replay of the journal when we next remount
2233 */
2234 sb->s_flags |= MS_RDONLY;
2235
2236 /*
2237 * OK, test if we are remounting a valid rw partition
2238 * readonly, and if so set the rdonly flag and then
2239 * mark the partition as valid again.
2240 */
2241 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2242 (sbi->s_mount_state & EXT3_VALID_FS))
2243 es->s_state = cpu_to_le16(sbi->s_mount_state);
2244
2245 ext3_mark_recovery_complete(sb, es);
2246 } else {
2247 __le32 ret;
2248 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2249 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2250 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2251 "remount RDWR because of unsupported "
2252 "optional features (%x).\n",
2253 sb->s_id, le32_to_cpu(ret));
2254 err = -EROFS;
2255 goto restore_opts;
2256 }
2257 /*
2258 * Mounting a RDONLY partition read-write, so reread
2259 * and store the current valid flag. (It may have
2260 * been changed by e2fsck since we originally mounted
2261 * the partition.)
2262 */
2263 ext3_clear_journal_err(sb, es);
2264 sbi->s_mount_state = le16_to_cpu(es->s_state);
2265 if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2266 err = ret;
2267 goto restore_opts;
2268 }
2269 if (!ext3_setup_super (sb, es, 0))
2270 sb->s_flags &= ~MS_RDONLY;
2271 }
2272 }
2273 #ifdef CONFIG_QUOTA
2274 /* Release old quota file names */
2275 for (i = 0; i < MAXQUOTAS; i++)
2276 if (old_opts.s_qf_names[i] &&
2277 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2278 kfree(old_opts.s_qf_names[i]);
2279 #endif
2280 return 0;
2281 restore_opts:
2282 sb->s_flags = old_sb_flags;
2283 sbi->s_mount_opt = old_opts.s_mount_opt;
2284 sbi->s_resuid = old_opts.s_resuid;
2285 sbi->s_resgid = old_opts.s_resgid;
2286 sbi->s_commit_interval = old_opts.s_commit_interval;
2287 #ifdef CONFIG_QUOTA
2288 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2289 for (i = 0; i < MAXQUOTAS; i++) {
2290 if (sbi->s_qf_names[i] &&
2291 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2292 kfree(sbi->s_qf_names[i]);
2293 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2294 }
2295 #endif
2296 return err;
2297 }
2298
2299 static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
2300 {
2301 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
2302 unsigned long overhead;
2303 int i;
2304
2305 if (test_opt (sb, MINIX_DF))
2306 overhead = 0;
2307 else {
2308 unsigned long ngroups;
2309 ngroups = EXT3_SB(sb)->s_groups_count;
2310 smp_rmb();
2311
2312 /*
2313 * Compute the overhead (FS structures)
2314 */
2315
2316 /*
2317 * All of the blocks before first_data_block are
2318 * overhead
2319 */
2320 overhead = le32_to_cpu(es->s_first_data_block);
2321
2322 /*
2323 * Add the overhead attributed to the superblock and
2324 * block group descriptors. If the sparse superblocks
2325 * feature is turned on, then not all groups have this.
2326 */
2327 for (i = 0; i < ngroups; i++) {
2328 overhead += ext3_bg_has_super(sb, i) +
2329 ext3_bg_num_gdb(sb, i);
2330 cond_resched();
2331 }
2332
2333 /*
2334 * Every block group has an inode bitmap, a block
2335 * bitmap, and an inode table.
2336 */
2337 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2338 }
2339
2340 buf->f_type = EXT3_SUPER_MAGIC;
2341 buf->f_bsize = sb->s_blocksize;
2342 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2343 buf->f_bfree = ext3_count_free_blocks (sb);
2344 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2345 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2346 buf->f_bavail = 0;
2347 buf->f_files = le32_to_cpu(es->s_inodes_count);
2348 buf->f_ffree = ext3_count_free_inodes (sb);
2349 buf->f_namelen = EXT3_NAME_LEN;
2350 return 0;
2351 }
2352
2353 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2354 * is locked for write. Otherwise the are possible deadlocks:
2355 * Process 1 Process 2
2356 * ext3_create() quota_sync()
2357 * journal_start() write_dquot()
2358 * DQUOT_INIT() down(dqio_sem)
2359 * down(dqio_sem) journal_start()
2360 *
2361 */
2362
2363 #ifdef CONFIG_QUOTA
2364
2365 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2366 {
2367 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2368 }
2369
2370 static int ext3_dquot_initialize(struct inode *inode, int type)
2371 {
2372 handle_t *handle;
2373 int ret, err;
2374
2375 /* We may create quota structure so we need to reserve enough blocks */
2376 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2377 if (IS_ERR(handle))
2378 return PTR_ERR(handle);
2379 ret = dquot_initialize(inode, type);
2380 err = ext3_journal_stop(handle);
2381 if (!ret)
2382 ret = err;
2383 return ret;
2384 }
2385
2386 static int ext3_dquot_drop(struct inode *inode)
2387 {
2388 handle_t *handle;
2389 int ret, err;
2390
2391 /* We may delete quota structure so we need to reserve enough blocks */
2392 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2393 if (IS_ERR(handle))
2394 return PTR_ERR(handle);
2395 ret = dquot_drop(inode);
2396 err = ext3_journal_stop(handle);
2397 if (!ret)
2398 ret = err;
2399 return ret;
2400 }
2401
2402 static int ext3_write_dquot(struct dquot *dquot)
2403 {
2404 int ret, err;
2405 handle_t *handle;
2406 struct inode *inode;
2407
2408 inode = dquot_to_inode(dquot);
2409 handle = ext3_journal_start(inode,
2410 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2411 if (IS_ERR(handle))
2412 return PTR_ERR(handle);
2413 ret = dquot_commit(dquot);
2414 err = ext3_journal_stop(handle);
2415 if (!ret)
2416 ret = err;
2417 return ret;
2418 }
2419
2420 static int ext3_acquire_dquot(struct dquot *dquot)
2421 {
2422 int ret, err;
2423 handle_t *handle;
2424
2425 handle = ext3_journal_start(dquot_to_inode(dquot),
2426 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2427 if (IS_ERR(handle))
2428 return PTR_ERR(handle);
2429 ret = dquot_acquire(dquot);
2430 err = ext3_journal_stop(handle);
2431 if (!ret)
2432 ret = err;
2433 return ret;
2434 }
2435
2436 static int ext3_release_dquot(struct dquot *dquot)
2437 {
2438 int ret, err;
2439 handle_t *handle;
2440
2441 handle = ext3_journal_start(dquot_to_inode(dquot),
2442 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2443 if (IS_ERR(handle))
2444 return PTR_ERR(handle);
2445 ret = dquot_release(dquot);
2446 err = ext3_journal_stop(handle);
2447 if (!ret)
2448 ret = err;
2449 return ret;
2450 }
2451
2452 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2453 {
2454 /* Are we journalling quotas? */
2455 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2456 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2457 dquot_mark_dquot_dirty(dquot);
2458 return ext3_write_dquot(dquot);
2459 } else {
2460 return dquot_mark_dquot_dirty(dquot);
2461 }
2462 }
2463
2464 static int ext3_write_info(struct super_block *sb, int type)
2465 {
2466 int ret, err;
2467 handle_t *handle;
2468
2469 /* Data block + inode block */
2470 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2471 if (IS_ERR(handle))
2472 return PTR_ERR(handle);
2473 ret = dquot_commit_info(sb, type);
2474 err = ext3_journal_stop(handle);
2475 if (!ret)
2476 ret = err;
2477 return ret;
2478 }
2479
2480 /*
2481 * Turn on quotas during mount time - we need to find
2482 * the quota file and such...
2483 */
2484 static int ext3_quota_on_mount(struct super_block *sb, int type)
2485 {
2486 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2487 EXT3_SB(sb)->s_jquota_fmt, type);
2488 }
2489
2490 /*
2491 * Standard function to be called on quota_on
2492 */
2493 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2494 char *path)
2495 {
2496 int err;
2497 struct nameidata nd;
2498
2499 if (!test_opt(sb, QUOTA))
2500 return -EINVAL;
2501 /* Not journalling quota? */
2502 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2503 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2504 return vfs_quota_on(sb, type, format_id, path);
2505 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2506 if (err)
2507 return err;
2508 /* Quotafile not on the same filesystem? */
2509 if (nd.mnt->mnt_sb != sb) {
2510 path_release(&nd);
2511 return -EXDEV;
2512 }
2513 /* Quotafile not of fs root? */
2514 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2515 printk(KERN_WARNING
2516 "EXT3-fs: Quota file not on filesystem root. "
2517 "Journalled quota will not work.\n");
2518 path_release(&nd);
2519 return vfs_quota_on(sb, type, format_id, path);
2520 }
2521
2522 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2523 * acquiring the locks... As quota files are never truncated and quota code
2524 * itself serializes the operations (and noone else should touch the files)
2525 * we don't have to be afraid of races */
2526 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2527 size_t len, loff_t off)
2528 {
2529 struct inode *inode = sb_dqopt(sb)->files[type];
2530 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2531 int err = 0;
2532 int offset = off & (sb->s_blocksize - 1);
2533 int tocopy;
2534 size_t toread;
2535 struct buffer_head *bh;
2536 loff_t i_size = i_size_read(inode);
2537
2538 if (off > i_size)
2539 return 0;
2540 if (off+len > i_size)
2541 len = i_size-off;
2542 toread = len;
2543 while (toread > 0) {
2544 tocopy = sb->s_blocksize - offset < toread ?
2545 sb->s_blocksize - offset : toread;
2546 bh = ext3_bread(NULL, inode, blk, 0, &err);
2547 if (err)
2548 return err;
2549 if (!bh) /* A hole? */
2550 memset(data, 0, tocopy);
2551 else
2552 memcpy(data, bh->b_data+offset, tocopy);
2553 brelse(bh);
2554 offset = 0;
2555 toread -= tocopy;
2556 data += tocopy;
2557 blk++;
2558 }
2559 return len;
2560 }
2561
2562 /* Write to quotafile (we know the transaction is already started and has
2563 * enough credits) */
2564 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2565 const char *data, size_t len, loff_t off)
2566 {
2567 struct inode *inode = sb_dqopt(sb)->files[type];
2568 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2569 int err = 0;
2570 int offset = off & (sb->s_blocksize - 1);
2571 int tocopy;
2572 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2573 size_t towrite = len;
2574 struct buffer_head *bh;
2575 handle_t *handle = journal_current_handle();
2576
2577 down(&inode->i_sem);
2578 while (towrite > 0) {
2579 tocopy = sb->s_blocksize - offset < towrite ?
2580 sb->s_blocksize - offset : towrite;
2581 bh = ext3_bread(handle, inode, blk, 1, &err);
2582 if (!bh)
2583 goto out;
2584 if (journal_quota) {
2585 err = ext3_journal_get_write_access(handle, bh);
2586 if (err) {
2587 brelse(bh);
2588 goto out;
2589 }
2590 }
2591 lock_buffer(bh);
2592 memcpy(bh->b_data+offset, data, tocopy);
2593 flush_dcache_page(bh->b_page);
2594 unlock_buffer(bh);
2595 if (journal_quota)
2596 err = ext3_journal_dirty_metadata(handle, bh);
2597 else {
2598 /* Always do at least ordered writes for quotas */
2599 err = ext3_journal_dirty_data(handle, bh);
2600 mark_buffer_dirty(bh);
2601 }
2602 brelse(bh);
2603 if (err)
2604 goto out;
2605 offset = 0;
2606 towrite -= tocopy;
2607 data += tocopy;
2608 blk++;
2609 }
2610 out:
2611 if (len == towrite)
2612 return err;
2613 if (inode->i_size < off+len-towrite) {
2614 i_size_write(inode, off+len-towrite);
2615 EXT3_I(inode)->i_disksize = inode->i_size;
2616 }
2617 inode->i_version++;
2618 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2619 ext3_mark_inode_dirty(handle, inode);
2620 up(&inode->i_sem);
2621 return len - towrite;
2622 }
2623
2624 #endif
2625
2626 static struct super_block *ext3_get_sb(struct file_system_type *fs_type,
2627 int flags, const char *dev_name, void *data)
2628 {
2629 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
2630 }
2631
2632 static struct file_system_type ext3_fs_type = {
2633 .owner = THIS_MODULE,
2634 .name = "ext3",
2635 .get_sb = ext3_get_sb,
2636 .kill_sb = kill_block_super,
2637 .fs_flags = FS_REQUIRES_DEV,
2638 };
2639
2640 static int __init init_ext3_fs(void)
2641 {
2642 int err = init_ext3_xattr();
2643 if (err)
2644 return err;
2645 err = init_inodecache();
2646 if (err)
2647 goto out1;
2648 err = register_filesystem(&ext3_fs_type);
2649 if (err)
2650 goto out;
2651 return 0;
2652 out:
2653 destroy_inodecache();
2654 out1:
2655 exit_ext3_xattr();
2656 return err;
2657 }
2658
2659 static void __exit exit_ext3_fs(void)
2660 {
2661 unregister_filesystem(&ext3_fs_type);
2662 destroy_inodecache();
2663 exit_ext3_xattr();
2664 }
2665
2666 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2667 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2668 MODULE_LICENSE("GPL");
2669 module_init(init_ext3_fs)
2670 module_exit(exit_ext3_fs)
kernel-based virtual machine