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[SPARC64]: Fix 2 bugs in huge page support.
[linux-2.6/verdex.git] / fs / ext3 / super.c
blob56bf765860199fd846bb28ba4a1d22825c099ce1
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 super_block * sb, 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 init_MUTEX(&ei->truncate_sem);
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 init_once, NULL);
486 if (ext3_inode_cachep == NULL)
487 return -ENOMEM;
488 return 0;
489 }
490
491 static void destroy_inodecache(void)
492 {
493 if (kmem_cache_destroy(ext3_inode_cachep))
494 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
495 }
496
497 static void ext3_clear_inode(struct inode *inode)
498 {
499 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
500 #ifdef CONFIG_EXT3_FS_POSIX_ACL
501 if (EXT3_I(inode)->i_acl &&
502 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
503 posix_acl_release(EXT3_I(inode)->i_acl);
504 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
505 }
506 if (EXT3_I(inode)->i_default_acl &&
507 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
508 posix_acl_release(EXT3_I(inode)->i_default_acl);
509 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
510 }
511 #endif
512 ext3_discard_reservation(inode);
513 EXT3_I(inode)->i_block_alloc_info = NULL;
514 kfree(rsv);
515 }
516
517 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
518 {
519 #if defined(CONFIG_QUOTA)
520 struct ext3_sb_info *sbi = EXT3_SB(sb);
521
522 if (sbi->s_jquota_fmt)
523 seq_printf(seq, ",jqfmt=%s",
524 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
525
526 if (sbi->s_qf_names[USRQUOTA])
527 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
528
529 if (sbi->s_qf_names[GRPQUOTA])
530 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
531
532 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
533 seq_puts(seq, ",usrquota");
534
535 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
536 seq_puts(seq, ",grpquota");
537 #endif
538 }
539
540 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
541 {
542 struct super_block *sb = vfs->mnt_sb;
543
544 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
545 seq_puts(seq, ",data=journal");
546 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
547 seq_puts(seq, ",data=ordered");
548 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
549 seq_puts(seq, ",data=writeback");
550
551 ext3_show_quota_options(seq, sb);
552
553 return 0;
554 }
555
556 #ifdef CONFIG_QUOTA
557 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
558 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
559
560 static int ext3_dquot_initialize(struct inode *inode, int type);
561 static int ext3_dquot_drop(struct inode *inode);
562 static int ext3_write_dquot(struct dquot *dquot);
563 static int ext3_acquire_dquot(struct dquot *dquot);
564 static int ext3_release_dquot(struct dquot *dquot);
565 static int ext3_mark_dquot_dirty(struct dquot *dquot);
566 static int ext3_write_info(struct super_block *sb, int type);
567 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
568 static int ext3_quota_on_mount(struct super_block *sb, int type);
569 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
570 size_t len, loff_t off);
571 static ssize_t ext3_quota_write(struct super_block *sb, int type,
572 const char *data, size_t len, loff_t off);
573
574 static struct dquot_operations ext3_quota_operations = {
575 .initialize = ext3_dquot_initialize,
576 .drop = ext3_dquot_drop,
577 .alloc_space = dquot_alloc_space,
578 .alloc_inode = dquot_alloc_inode,
579 .free_space = dquot_free_space,
580 .free_inode = dquot_free_inode,
581 .transfer = dquot_transfer,
582 .write_dquot = ext3_write_dquot,
583 .acquire_dquot = ext3_acquire_dquot,
584 .release_dquot = ext3_release_dquot,
585 .mark_dirty = ext3_mark_dquot_dirty,
586 .write_info = ext3_write_info
587 };
588
589 static struct quotactl_ops ext3_qctl_operations = {
590 .quota_on = ext3_quota_on,
591 .quota_off = vfs_quota_off,
592 .quota_sync = vfs_quota_sync,
593 .get_info = vfs_get_dqinfo,
594 .set_info = vfs_set_dqinfo,
595 .get_dqblk = vfs_get_dqblk,
596 .set_dqblk = vfs_set_dqblk
597 };
598 #endif
599
600 static struct super_operations ext3_sops = {
601 .alloc_inode = ext3_alloc_inode,
602 .destroy_inode = ext3_destroy_inode,
603 .read_inode = ext3_read_inode,
604 .write_inode = ext3_write_inode,
605 .dirty_inode = ext3_dirty_inode,
606 .delete_inode = ext3_delete_inode,
607 .put_super = ext3_put_super,
608 .write_super = ext3_write_super,
609 .sync_fs = ext3_sync_fs,
610 .write_super_lockfs = ext3_write_super_lockfs,
611 .unlockfs = ext3_unlockfs,
612 .statfs = ext3_statfs,
613 .remount_fs = ext3_remount,
614 .clear_inode = ext3_clear_inode,
615 .show_options = ext3_show_options,
616 #ifdef CONFIG_QUOTA
617 .quota_read = ext3_quota_read,
618 .quota_write = ext3_quota_write,
619 #endif
620 };
621
622 static struct export_operations ext3_export_ops = {
623 .get_parent = ext3_get_parent,
624 };
625
626 enum {
627 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
628 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
629 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
630 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
631 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,
632 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
633 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
634 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
635 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
636 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
637 Opt_grpquota
638 };
639
640 static match_table_t tokens = {
641 {Opt_bsd_df, "bsddf"},
642 {Opt_minix_df, "minixdf"},
643 {Opt_grpid, "grpid"},
644 {Opt_grpid, "bsdgroups"},
645 {Opt_nogrpid, "nogrpid"},
646 {Opt_nogrpid, "sysvgroups"},
647 {Opt_resgid, "resgid=%u"},
648 {Opt_resuid, "resuid=%u"},
649 {Opt_sb, "sb=%u"},
650 {Opt_err_cont, "errors=continue"},
651 {Opt_err_panic, "errors=panic"},
652 {Opt_err_ro, "errors=remount-ro"},
653 {Opt_nouid32, "nouid32"},
654 {Opt_nocheck, "nocheck"},
655 {Opt_nocheck, "check=none"},
656 {Opt_debug, "debug"},
657 {Opt_oldalloc, "oldalloc"},
658 {Opt_orlov, "orlov"},
659 {Opt_user_xattr, "user_xattr"},
660 {Opt_nouser_xattr, "nouser_xattr"},
661 {Opt_acl, "acl"},
662 {Opt_noacl, "noacl"},
663 {Opt_reservation, "reservation"},
664 {Opt_noreservation, "noreservation"},
665 {Opt_noload, "noload"},
666 {Opt_nobh, "nobh"},
667 {Opt_commit, "commit=%u"},
668 {Opt_journal_update, "journal=update"},
669 {Opt_journal_inum, "journal=%u"},
670 {Opt_journal_dev, "journal_dev=%u"},
671 {Opt_abort, "abort"},
672 {Opt_data_journal, "data=journal"},
673 {Opt_data_ordered, "data=ordered"},
674 {Opt_data_writeback, "data=writeback"},
675 {Opt_offusrjquota, "usrjquota="},
676 {Opt_usrjquota, "usrjquota=%s"},
677 {Opt_offgrpjquota, "grpjquota="},
678 {Opt_grpjquota, "grpjquota=%s"},
679 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
680 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
681 {Opt_grpquota, "grpquota"},
682 {Opt_noquota, "noquota"},
683 {Opt_quota, "quota"},
684 {Opt_usrquota, "usrquota"},
685 {Opt_barrier, "barrier=%u"},
686 {Opt_err, NULL},
687 {Opt_resize, "resize"},
688 };
689
690 static unsigned long get_sb_block(void **data)
691 {
692 unsigned long sb_block;
693 char *options = (char *) *data;
694
695 if (!options || strncmp(options, "sb=", 3) != 0)
696 return 1; /* Default location */
697 options += 3;
698 sb_block = simple_strtoul(options, &options, 0);
699 if (*options && *options != ',') {
700 printk("EXT3-fs: Invalid sb specification: %s\n",
701 (char *) *data);
702 return 1;
703 }
704 if (*options == ',')
705 options++;
706 *data = (void *) options;
707 return sb_block;
708 }
709
710 static int parse_options (char *options, struct super_block *sb,
711 unsigned long *inum, unsigned long *journal_devnum,
712 unsigned long *n_blocks_count, int is_remount)
713 {
714 struct ext3_sb_info *sbi = EXT3_SB(sb);
715 char * p;
716 substring_t args[MAX_OPT_ARGS];
717 int data_opt = 0;
718 int option;
719 #ifdef CONFIG_QUOTA
720 int qtype;
721 char *qname;
722 #endif
723
724 if (!options)
725 return 1;
726
727 while ((p = strsep (&options, ",")) != NULL) {
728 int token;
729 if (!*p)
730 continue;
731
732 token = match_token(p, tokens, args);
733 switch (token) {
734 case Opt_bsd_df:
735 clear_opt (sbi->s_mount_opt, MINIX_DF);
736 break;
737 case Opt_minix_df:
738 set_opt (sbi->s_mount_opt, MINIX_DF);
739 break;
740 case Opt_grpid:
741 set_opt (sbi->s_mount_opt, GRPID);
742 break;
743 case Opt_nogrpid:
744 clear_opt (sbi->s_mount_opt, GRPID);
745 break;
746 case Opt_resuid:
747 if (match_int(&args[0], &option))
748 return 0;
749 sbi->s_resuid = option;
750 break;
751 case Opt_resgid:
752 if (match_int(&args[0], &option))
753 return 0;
754 sbi->s_resgid = option;
755 break;
756 case Opt_sb:
757 /* handled by get_sb_block() instead of here */
758 /* *sb_block = match_int(&args[0]); */
759 break;
760 case Opt_err_panic:
761 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
762 clear_opt (sbi->s_mount_opt, ERRORS_RO);
763 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
764 break;
765 case Opt_err_ro:
766 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
767 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
768 set_opt (sbi->s_mount_opt, ERRORS_RO);
769 break;
770 case Opt_err_cont:
771 clear_opt (sbi->s_mount_opt, ERRORS_RO);
772 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
773 set_opt (sbi->s_mount_opt, ERRORS_CONT);
774 break;
775 case Opt_nouid32:
776 set_opt (sbi->s_mount_opt, NO_UID32);
777 break;
778 case Opt_nocheck:
779 clear_opt (sbi->s_mount_opt, CHECK);
780 break;
781 case Opt_debug:
782 set_opt (sbi->s_mount_opt, DEBUG);
783 break;
784 case Opt_oldalloc:
785 set_opt (sbi->s_mount_opt, OLDALLOC);
786 break;
787 case Opt_orlov:
788 clear_opt (sbi->s_mount_opt, OLDALLOC);
789 break;
790 #ifdef CONFIG_EXT3_FS_XATTR
791 case Opt_user_xattr:
792 set_opt (sbi->s_mount_opt, XATTR_USER);
793 break;
794 case Opt_nouser_xattr:
795 clear_opt (sbi->s_mount_opt, XATTR_USER);
796 break;
797 #else
798 case Opt_user_xattr:
799 case Opt_nouser_xattr:
800 printk("EXT3 (no)user_xattr options not supported\n");
801 break;
802 #endif
803 #ifdef CONFIG_EXT3_FS_POSIX_ACL
804 case Opt_acl:
805 set_opt(sbi->s_mount_opt, POSIX_ACL);
806 break;
807 case Opt_noacl:
808 clear_opt(sbi->s_mount_opt, POSIX_ACL);
809 break;
810 #else
811 case Opt_acl:
812 case Opt_noacl:
813 printk("EXT3 (no)acl options not supported\n");
814 break;
815 #endif
816 case Opt_reservation:
817 set_opt(sbi->s_mount_opt, RESERVATION);
818 break;
819 case Opt_noreservation:
820 clear_opt(sbi->s_mount_opt, RESERVATION);
821 break;
822 case Opt_journal_update:
823 /* @@@ FIXME */
824 /* Eventually we will want to be able to create
825 a journal file here. For now, only allow the
826 user to specify an existing inode to be the
827 journal file. */
828 if (is_remount) {
829 printk(KERN_ERR "EXT3-fs: cannot specify "
830 "journal on remount\n");
831 return 0;
832 }
833 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
834 break;
835 case Opt_journal_inum:
836 if (is_remount) {
837 printk(KERN_ERR "EXT3-fs: cannot specify "
838 "journal on remount\n");
839 return 0;
840 }
841 if (match_int(&args[0], &option))
842 return 0;
843 *inum = option;
844 break;
845 case Opt_journal_dev:
846 if (is_remount) {
847 printk(KERN_ERR "EXT3-fs: cannot specify "
848 "journal on remount\n");
849 return 0;
850 }
851 if (match_int(&args[0], &option))
852 return 0;
853 *journal_devnum = option;
854 break;
855 case Opt_noload:
856 set_opt (sbi->s_mount_opt, NOLOAD);
857 break;
858 case Opt_commit:
859 if (match_int(&args[0], &option))
860 return 0;
861 if (option < 0)
862 return 0;
863 if (option == 0)
864 option = JBD_DEFAULT_MAX_COMMIT_AGE;
865 sbi->s_commit_interval = HZ * option;
866 break;
867 case Opt_data_journal:
868 data_opt = EXT3_MOUNT_JOURNAL_DATA;
869 goto datacheck;
870 case Opt_data_ordered:
871 data_opt = EXT3_MOUNT_ORDERED_DATA;
872 goto datacheck;
873 case Opt_data_writeback:
874 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
875 datacheck:
876 if (is_remount) {
877 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
878 != data_opt) {
879 printk(KERN_ERR
880 "EXT3-fs: cannot change data "
881 "mode on remount\n");
882 return 0;
883 }
884 } else {
885 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
886 sbi->s_mount_opt |= data_opt;
887 }
888 break;
889 #ifdef CONFIG_QUOTA
890 case Opt_usrjquota:
891 qtype = USRQUOTA;
892 goto set_qf_name;
893 case Opt_grpjquota:
894 qtype = GRPQUOTA;
895 set_qf_name:
896 if (sb_any_quota_enabled(sb)) {
897 printk(KERN_ERR
898 "EXT3-fs: Cannot change journalled "
899 "quota options when quota turned on.\n");
900 return 0;
901 }
902 qname = match_strdup(&args[0]);
903 if (!qname) {
904 printk(KERN_ERR
905 "EXT3-fs: not enough memory for "
906 "storing quotafile name.\n");
907 return 0;
908 }
909 if (sbi->s_qf_names[qtype] &&
910 strcmp(sbi->s_qf_names[qtype], qname)) {
911 printk(KERN_ERR
912 "EXT3-fs: %s quota file already "
913 "specified.\n", QTYPE2NAME(qtype));
914 kfree(qname);
915 return 0;
916 }
917 sbi->s_qf_names[qtype] = qname;
918 if (strchr(sbi->s_qf_names[qtype], '/')) {
919 printk(KERN_ERR
920 "EXT3-fs: quotafile must be on "
921 "filesystem root.\n");
922 kfree(sbi->s_qf_names[qtype]);
923 sbi->s_qf_names[qtype] = NULL;
924 return 0;
925 }
926 set_opt(sbi->s_mount_opt, QUOTA);
927 break;
928 case Opt_offusrjquota:
929 qtype = USRQUOTA;
930 goto clear_qf_name;
931 case Opt_offgrpjquota:
932 qtype = GRPQUOTA;
933 clear_qf_name:
934 if (sb_any_quota_enabled(sb)) {
935 printk(KERN_ERR "EXT3-fs: Cannot change "
936 "journalled quota options when "
937 "quota turned on.\n");
938 return 0;
939 }
940 /*
941 * The space will be released later when all options
942 * are confirmed to be correct
943 */
944 sbi->s_qf_names[qtype] = NULL;
945 break;
946 case Opt_jqfmt_vfsold:
947 sbi->s_jquota_fmt = QFMT_VFS_OLD;
948 break;
949 case Opt_jqfmt_vfsv0:
950 sbi->s_jquota_fmt = QFMT_VFS_V0;
951 break;
952 case Opt_quota:
953 case Opt_usrquota:
954 set_opt(sbi->s_mount_opt, QUOTA);
955 set_opt(sbi->s_mount_opt, USRQUOTA);
956 break;
957 case Opt_grpquota:
958 set_opt(sbi->s_mount_opt, QUOTA);
959 set_opt(sbi->s_mount_opt, GRPQUOTA);
960 break;
961 case Opt_noquota:
962 if (sb_any_quota_enabled(sb)) {
963 printk(KERN_ERR "EXT3-fs: Cannot change quota "
964 "options when quota turned on.\n");
965 return 0;
966 }
967 clear_opt(sbi->s_mount_opt, QUOTA);
968 clear_opt(sbi->s_mount_opt, USRQUOTA);
969 clear_opt(sbi->s_mount_opt, GRPQUOTA);
970 break;
971 #else
972 case Opt_quota:
973 case Opt_usrquota:
974 case Opt_grpquota:
975 case Opt_usrjquota:
976 case Opt_grpjquota:
977 case Opt_offusrjquota:
978 case Opt_offgrpjquota:
979 case Opt_jqfmt_vfsold:
980 case Opt_jqfmt_vfsv0:
981 printk(KERN_ERR
982 "EXT3-fs: journalled quota options not "
983 "supported.\n");
984 break;
985 case Opt_noquota:
986 break;
987 #endif
988 case Opt_abort:
989 set_opt(sbi->s_mount_opt, ABORT);
990 break;
991 case Opt_barrier:
992 if (match_int(&args[0], &option))
993 return 0;
994 if (option)
995 set_opt(sbi->s_mount_opt, BARRIER);
996 else
997 clear_opt(sbi->s_mount_opt, BARRIER);
998 break;
999 case Opt_ignore:
1000 break;
1001 case Opt_resize:
1002 if (!is_remount) {
1003 printk("EXT3-fs: resize option only available "
1004 "for remount\n");
1005 return 0;
1006 }
1007 if (match_int(&args[0], &option) != 0)
1008 return 0;
1009 *n_blocks_count = option;
1010 break;
1011 case Opt_nobh:
1012 set_opt(sbi->s_mount_opt, NOBH);
1013 break;
1014 default:
1015 printk (KERN_ERR
1016 "EXT3-fs: Unrecognized mount option \"%s\" "
1017 "or missing value\n", p);
1018 return 0;
1019 }
1020 }
1021 #ifdef CONFIG_QUOTA
1022 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1023 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1024 sbi->s_qf_names[USRQUOTA])
1025 clear_opt(sbi->s_mount_opt, USRQUOTA);
1026
1027 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1028 sbi->s_qf_names[GRPQUOTA])
1029 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1030
1031 if ((sbi->s_qf_names[USRQUOTA] &&
1032 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1033 (sbi->s_qf_names[GRPQUOTA] &&
1034 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1035 printk(KERN_ERR "EXT3-fs: old and new quota "
1036 "format mixing.\n");
1037 return 0;
1038 }
1039
1040 if (!sbi->s_jquota_fmt) {
1041 printk(KERN_ERR "EXT3-fs: journalled quota format "
1042 "not specified.\n");
1043 return 0;
1044 }
1045 } else {
1046 if (sbi->s_jquota_fmt) {
1047 printk(KERN_ERR "EXT3-fs: journalled quota format "
1048 "specified with no journalling "
1049 "enabled.\n");
1050 return 0;
1051 }
1052 }
1053 #endif
1054 return 1;
1055 }
1056
1057 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1058 int read_only)
1059 {
1060 struct ext3_sb_info *sbi = EXT3_SB(sb);
1061 int res = 0;
1062
1063 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1064 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1065 "forcing read-only mode\n");
1066 res = MS_RDONLY;
1067 }
1068 if (read_only)
1069 return res;
1070 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1071 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1072 "running e2fsck is recommended\n");
1073 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1074 printk (KERN_WARNING
1075 "EXT3-fs warning: mounting fs with errors, "
1076 "running e2fsck is recommended\n");
1077 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1078 le16_to_cpu(es->s_mnt_count) >=
1079 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1080 printk (KERN_WARNING
1081 "EXT3-fs warning: maximal mount count reached, "
1082 "running e2fsck is recommended\n");
1083 else if (le32_to_cpu(es->s_checkinterval) &&
1084 (le32_to_cpu(es->s_lastcheck) +
1085 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1086 printk (KERN_WARNING
1087 "EXT3-fs warning: checktime reached, "
1088 "running e2fsck is recommended\n");
1089 #if 0
1090 /* @@@ We _will_ want to clear the valid bit if we find
1091 inconsistencies, to force a fsck at reboot. But for
1092 a plain journaled filesystem we can keep it set as
1093 valid forever! :) */
1094 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1095 #endif
1096 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1097 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1098 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1099 es->s_mtime = cpu_to_le32(get_seconds());
1100 ext3_update_dynamic_rev(sb);
1101 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1102
1103 ext3_commit_super(sb, es, 1);
1104 if (test_opt(sb, DEBUG))
1105 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1106 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1107 sb->s_blocksize,
1108 sbi->s_groups_count,
1109 EXT3_BLOCKS_PER_GROUP(sb),
1110 EXT3_INODES_PER_GROUP(sb),
1111 sbi->s_mount_opt);
1112
1113 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1114 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1115 char b[BDEVNAME_SIZE];
1116
1117 printk("external journal on %s\n",
1118 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1119 } else {
1120 printk("internal journal\n");
1121 }
1122 return res;
1123 }
1124
1125 /* Called at mount-time, super-block is locked */
1126 static int ext3_check_descriptors (struct super_block * sb)
1127 {
1128 struct ext3_sb_info *sbi = EXT3_SB(sb);
1129 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1130 struct ext3_group_desc * gdp = NULL;
1131 int desc_block = 0;
1132 int i;
1133
1134 ext3_debug ("Checking group descriptors");
1135
1136 for (i = 0; i < sbi->s_groups_count; i++)
1137 {
1138 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1139 gdp = (struct ext3_group_desc *)
1140 sbi->s_group_desc[desc_block++]->b_data;
1141 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1142 le32_to_cpu(gdp->bg_block_bitmap) >=
1143 block + EXT3_BLOCKS_PER_GROUP(sb))
1144 {
1145 ext3_error (sb, "ext3_check_descriptors",
1146 "Block bitmap for group %d"
1147 " not in group (block %lu)!",
1148 i, (unsigned long)
1149 le32_to_cpu(gdp->bg_block_bitmap));
1150 return 0;
1151 }
1152 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1153 le32_to_cpu(gdp->bg_inode_bitmap) >=
1154 block + EXT3_BLOCKS_PER_GROUP(sb))
1155 {
1156 ext3_error (sb, "ext3_check_descriptors",
1157 "Inode bitmap for group %d"
1158 " not in group (block %lu)!",
1159 i, (unsigned long)
1160 le32_to_cpu(gdp->bg_inode_bitmap));
1161 return 0;
1162 }
1163 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1164 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1165 block + EXT3_BLOCKS_PER_GROUP(sb))
1166 {
1167 ext3_error (sb, "ext3_check_descriptors",
1168 "Inode table for group %d"
1169 " not in group (block %lu)!",
1170 i, (unsigned long)
1171 le32_to_cpu(gdp->bg_inode_table));
1172 return 0;
1173 }
1174 block += EXT3_BLOCKS_PER_GROUP(sb);
1175 gdp++;
1176 }
1177
1178 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1179 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1180 return 1;
1181 }
1182
1183
1184 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1185 * the superblock) which were deleted from all directories, but held open by
1186 * a process at the time of a crash. We walk the list and try to delete these
1187 * inodes at recovery time (only with a read-write filesystem).
1188 *
1189 * In order to keep the orphan inode chain consistent during traversal (in
1190 * case of crash during recovery), we link each inode into the superblock
1191 * orphan list_head and handle it the same way as an inode deletion during
1192 * normal operation (which journals the operations for us).
1193 *
1194 * We only do an iget() and an iput() on each inode, which is very safe if we
1195 * accidentally point at an in-use or already deleted inode. The worst that
1196 * can happen in this case is that we get a "bit already cleared" message from
1197 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1198 * e2fsck was run on this filesystem, and it must have already done the orphan
1199 * inode cleanup for us, so we can safely abort without any further action.
1200 */
1201 static void ext3_orphan_cleanup (struct super_block * sb,
1202 struct ext3_super_block * es)
1203 {
1204 unsigned int s_flags = sb->s_flags;
1205 int nr_orphans = 0, nr_truncates = 0;
1206 #ifdef CONFIG_QUOTA
1207 int i;
1208 #endif
1209 if (!es->s_last_orphan) {
1210 jbd_debug(4, "no orphan inodes to clean up\n");
1211 return;
1212 }
1213
1214 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1215 if (es->s_last_orphan)
1216 jbd_debug(1, "Errors on filesystem, "
1217 "clearing orphan list.\n");
1218 es->s_last_orphan = 0;
1219 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1220 return;
1221 }
1222
1223 if (s_flags & MS_RDONLY) {
1224 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1225 sb->s_id);
1226 sb->s_flags &= ~MS_RDONLY;
1227 }
1228 #ifdef CONFIG_QUOTA
1229 /* Needed for iput() to work correctly and not trash data */
1230 sb->s_flags |= MS_ACTIVE;
1231 /* Turn on quotas so that they are updated correctly */
1232 for (i = 0; i < MAXQUOTAS; i++) {
1233 if (EXT3_SB(sb)->s_qf_names[i]) {
1234 int ret = ext3_quota_on_mount(sb, i);
1235 if (ret < 0)
1236 printk(KERN_ERR
1237 "EXT3-fs: Cannot turn on journalled "
1238 "quota: error %d\n", ret);
1239 }
1240 }
1241 #endif
1242
1243 while (es->s_last_orphan) {
1244 struct inode *inode;
1245
1246 if (!(inode =
1247 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1248 es->s_last_orphan = 0;
1249 break;
1250 }
1251
1252 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1253 DQUOT_INIT(inode);
1254 if (inode->i_nlink) {
1255 printk(KERN_DEBUG
1256 "%s: truncating inode %ld to %Ld bytes\n",
1257 __FUNCTION__, inode->i_ino, inode->i_size);
1258 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1259 inode->i_ino, inode->i_size);
1260 ext3_truncate(inode);
1261 nr_truncates++;
1262 } else {
1263 printk(KERN_DEBUG
1264 "%s: deleting unreferenced inode %ld\n",
1265 __FUNCTION__, inode->i_ino);
1266 jbd_debug(2, "deleting unreferenced inode %ld\n",
1267 inode->i_ino);
1268 nr_orphans++;
1269 }
1270 iput(inode); /* The delete magic happens here! */
1271 }
1272
1273 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1274
1275 if (nr_orphans)
1276 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1277 sb->s_id, PLURAL(nr_orphans));
1278 if (nr_truncates)
1279 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1280 sb->s_id, PLURAL(nr_truncates));
1281 #ifdef CONFIG_QUOTA
1282 /* Turn quotas off */
1283 for (i = 0; i < MAXQUOTAS; i++) {
1284 if (sb_dqopt(sb)->files[i])
1285 vfs_quota_off(sb, i);
1286 }
1287 #endif
1288 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1289 }
1290
1291 #define log2(n) ffz(~(n))
1292
1293 /*
1294 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1295 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1296 * We need to be 1 filesystem block less than the 2^32 sector limit.
1297 */
1298 static loff_t ext3_max_size(int bits)
1299 {
1300 loff_t res = EXT3_NDIR_BLOCKS;
1301 /* This constant is calculated to be the largest file size for a
1302 * dense, 4k-blocksize file such that the total number of
1303 * sectors in the file, including data and all indirect blocks,
1304 * does not exceed 2^32. */
1305 const loff_t upper_limit = 0x1ff7fffd000LL;
1306
1307 res += 1LL << (bits-2);
1308 res += 1LL << (2*(bits-2));
1309 res += 1LL << (3*(bits-2));
1310 res <<= bits;
1311 if (res > upper_limit)
1312 res = upper_limit;
1313 return res;
1314 }
1315
1316 static unsigned long descriptor_loc(struct super_block *sb,
1317 unsigned long logic_sb_block,
1318 int nr)
1319 {
1320 struct ext3_sb_info *sbi = EXT3_SB(sb);
1321 unsigned long bg, first_data_block, first_meta_bg;
1322 int has_super = 0;
1323
1324 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1325 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1326
1327 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1328 nr < first_meta_bg)
1329 return (logic_sb_block + nr + 1);
1330 bg = sbi->s_desc_per_block * nr;
1331 if (ext3_bg_has_super(sb, bg))
1332 has_super = 1;
1333 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1334 }
1335
1336
1337 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1338 {
1339 struct buffer_head * bh;
1340 struct ext3_super_block *es = NULL;
1341 struct ext3_sb_info *sbi;
1342 unsigned long block;
1343 unsigned long sb_block = get_sb_block(&data);
1344 unsigned long logic_sb_block;
1345 unsigned long offset = 0;
1346 unsigned long journal_inum = 0;
1347 unsigned long journal_devnum = 0;
1348 unsigned long def_mount_opts;
1349 struct inode *root;
1350 int blocksize;
1351 int hblock;
1352 int db_count;
1353 int i;
1354 int needs_recovery;
1355 __le32 features;
1356
1357 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1358 if (!sbi)
1359 return -ENOMEM;
1360 sb->s_fs_info = sbi;
1361 memset(sbi, 0, sizeof(*sbi));
1362 sbi->s_mount_opt = 0;
1363 sbi->s_resuid = EXT3_DEF_RESUID;
1364 sbi->s_resgid = EXT3_DEF_RESGID;
1365
1366 unlock_kernel();
1367
1368 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1369 if (!blocksize) {
1370 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1371 goto out_fail;
1372 }
1373
1374 /*
1375 * The ext3 superblock will not be buffer aligned for other than 1kB
1376 * block sizes. We need to calculate the offset from buffer start.
1377 */
1378 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1379 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1380 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1381 } else {
1382 logic_sb_block = sb_block;
1383 }
1384
1385 if (!(bh = sb_bread(sb, logic_sb_block))) {
1386 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1387 goto out_fail;
1388 }
1389 /*
1390 * Note: s_es must be initialized as soon as possible because
1391 * some ext3 macro-instructions depend on its value
1392 */
1393 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1394 sbi->s_es = es;
1395 sb->s_magic = le16_to_cpu(es->s_magic);
1396 if (sb->s_magic != EXT3_SUPER_MAGIC)
1397 goto cantfind_ext3;
1398
1399 /* Set defaults before we parse the mount options */
1400 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1401 if (def_mount_opts & EXT3_DEFM_DEBUG)
1402 set_opt(sbi->s_mount_opt, DEBUG);
1403 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1404 set_opt(sbi->s_mount_opt, GRPID);
1405 if (def_mount_opts & EXT3_DEFM_UID16)
1406 set_opt(sbi->s_mount_opt, NO_UID32);
1407 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1408 set_opt(sbi->s_mount_opt, XATTR_USER);
1409 if (def_mount_opts & EXT3_DEFM_ACL)
1410 set_opt(sbi->s_mount_opt, POSIX_ACL);
1411 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1412 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1413 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1414 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1415 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1416 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1417
1418 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1419 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1420 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1421 set_opt(sbi->s_mount_opt, ERRORS_RO);
1422
1423 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1424 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1425
1426 set_opt(sbi->s_mount_opt, RESERVATION);
1427
1428 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1429 NULL, 0))
1430 goto failed_mount;
1431
1432 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1433 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1434
1435 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1436 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1437 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1438 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1439 printk(KERN_WARNING
1440 "EXT3-fs warning: feature flags set on rev 0 fs, "
1441 "running e2fsck is recommended\n");
1442 /*
1443 * Check feature flags regardless of the revision level, since we
1444 * previously didn't change the revision level when setting the flags,
1445 * so there is a chance incompat flags are set on a rev 0 filesystem.
1446 */
1447 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1448 if (features) {
1449 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1450 "unsupported optional features (%x).\n",
1451 sb->s_id, le32_to_cpu(features));
1452 goto failed_mount;
1453 }
1454 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1455 if (!(sb->s_flags & MS_RDONLY) && features) {
1456 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1457 "unsupported optional features (%x).\n",
1458 sb->s_id, le32_to_cpu(features));
1459 goto failed_mount;
1460 }
1461 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1462
1463 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1464 blocksize > EXT3_MAX_BLOCK_SIZE) {
1465 printk(KERN_ERR
1466 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1467 blocksize, sb->s_id);
1468 goto failed_mount;
1469 }
1470
1471 hblock = bdev_hardsect_size(sb->s_bdev);
1472 if (sb->s_blocksize != blocksize) {
1473 /*
1474 * Make sure the blocksize for the filesystem is larger
1475 * than the hardware sectorsize for the machine.
1476 */
1477 if (blocksize < hblock) {
1478 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1479 "device blocksize %d.\n", blocksize, hblock);
1480 goto failed_mount;
1481 }
1482
1483 brelse (bh);
1484 sb_set_blocksize(sb, blocksize);
1485 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1486 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1487 bh = sb_bread(sb, logic_sb_block);
1488 if (!bh) {
1489 printk(KERN_ERR
1490 "EXT3-fs: Can't read superblock on 2nd try.\n");
1491 goto failed_mount;
1492 }
1493 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1494 sbi->s_es = es;
1495 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1496 printk (KERN_ERR
1497 "EXT3-fs: Magic mismatch, very weird !\n");
1498 goto failed_mount;
1499 }
1500 }
1501
1502 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1503
1504 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1505 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1506 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1507 } else {
1508 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1509 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1510 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1511 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1512 (sbi->s_inode_size > blocksize)) {
1513 printk (KERN_ERR
1514 "EXT3-fs: unsupported inode size: %d\n",
1515 sbi->s_inode_size);
1516 goto failed_mount;
1517 }
1518 }
1519 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1520 le32_to_cpu(es->s_log_frag_size);
1521 if (blocksize != sbi->s_frag_size) {
1522 printk(KERN_ERR
1523 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1524 sbi->s_frag_size, blocksize);
1525 goto failed_mount;
1526 }
1527 sbi->s_frags_per_block = 1;
1528 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1529 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1530 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1531 if (EXT3_INODE_SIZE(sb) == 0)
1532 goto cantfind_ext3;
1533 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1534 if (sbi->s_inodes_per_block == 0)
1535 goto cantfind_ext3;
1536 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1537 sbi->s_inodes_per_block;
1538 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1539 sbi->s_sbh = bh;
1540 sbi->s_mount_state = le16_to_cpu(es->s_state);
1541 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1542 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1543 for (i=0; i < 4; i++)
1544 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1545 sbi->s_def_hash_version = es->s_def_hash_version;
1546
1547 if (sbi->s_blocks_per_group > blocksize * 8) {
1548 printk (KERN_ERR
1549 "EXT3-fs: #blocks per group too big: %lu\n",
1550 sbi->s_blocks_per_group);
1551 goto failed_mount;
1552 }
1553 if (sbi->s_frags_per_group > blocksize * 8) {
1554 printk (KERN_ERR
1555 "EXT3-fs: #fragments per group too big: %lu\n",
1556 sbi->s_frags_per_group);
1557 goto failed_mount;
1558 }
1559 if (sbi->s_inodes_per_group > blocksize * 8) {
1560 printk (KERN_ERR
1561 "EXT3-fs: #inodes per group too big: %lu\n",
1562 sbi->s_inodes_per_group);
1563 goto failed_mount;
1564 }
1565
1566 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1567 goto cantfind_ext3;
1568 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1569 le32_to_cpu(es->s_first_data_block) +
1570 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1571 EXT3_BLOCKS_PER_GROUP(sb);
1572 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1573 EXT3_DESC_PER_BLOCK(sb);
1574 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1575 GFP_KERNEL);
1576 if (sbi->s_group_desc == NULL) {
1577 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1578 goto failed_mount;
1579 }
1580
1581 percpu_counter_init(&sbi->s_freeblocks_counter);
1582 percpu_counter_init(&sbi->s_freeinodes_counter);
1583 percpu_counter_init(&sbi->s_dirs_counter);
1584 bgl_lock_init(&sbi->s_blockgroup_lock);
1585
1586 for (i = 0; i < db_count; i++) {
1587 block = descriptor_loc(sb, logic_sb_block, i);
1588 sbi->s_group_desc[i] = sb_bread(sb, block);
1589 if (!sbi->s_group_desc[i]) {
1590 printk (KERN_ERR "EXT3-fs: "
1591 "can't read group descriptor %d\n", i);
1592 db_count = i;
1593 goto failed_mount2;
1594 }
1595 }
1596 if (!ext3_check_descriptors (sb)) {
1597 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1598 goto failed_mount2;
1599 }
1600 sbi->s_gdb_count = db_count;
1601 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1602 spin_lock_init(&sbi->s_next_gen_lock);
1603 /* per fileystem reservation list head & lock */
1604 spin_lock_init(&sbi->s_rsv_window_lock);
1605 sbi->s_rsv_window_root = RB_ROOT;
1606 /* Add a single, static dummy reservation to the start of the
1607 * reservation window list --- it gives us a placeholder for
1608 * append-at-start-of-list which makes the allocation logic
1609 * _much_ simpler. */
1610 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1611 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1612 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1613 sbi->s_rsv_window_head.rsv_goal_size = 0;
1614 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1615
1616 /*
1617 * set up enough so that it can read an inode
1618 */
1619 sb->s_op = &ext3_sops;
1620 sb->s_export_op = &ext3_export_ops;
1621 sb->s_xattr = ext3_xattr_handlers;
1622 #ifdef CONFIG_QUOTA
1623 sb->s_qcop = &ext3_qctl_operations;
1624 sb->dq_op = &ext3_quota_operations;
1625 #endif
1626 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1627
1628 sb->s_root = NULL;
1629
1630 needs_recovery = (es->s_last_orphan != 0 ||
1631 EXT3_HAS_INCOMPAT_FEATURE(sb,
1632 EXT3_FEATURE_INCOMPAT_RECOVER));
1633
1634 /*
1635 * The first inode we look at is the journal inode. Don't try
1636 * root first: it may be modified in the journal!
1637 */
1638 if (!test_opt(sb, NOLOAD) &&
1639 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1640 if (ext3_load_journal(sb, es, journal_devnum))
1641 goto failed_mount2;
1642 } else if (journal_inum) {
1643 if (ext3_create_journal(sb, es, journal_inum))
1644 goto failed_mount2;
1645 } else {
1646 if (!silent)
1647 printk (KERN_ERR
1648 "ext3: No journal on filesystem on %s\n",
1649 sb->s_id);
1650 goto failed_mount2;
1651 }
1652
1653 /* We have now updated the journal if required, so we can
1654 * validate the data journaling mode. */
1655 switch (test_opt(sb, DATA_FLAGS)) {
1656 case 0:
1657 /* No mode set, assume a default based on the journal
1658 capabilities: ORDERED_DATA if the journal can
1659 cope, else JOURNAL_DATA */
1660 if (journal_check_available_features
1661 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1662 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1663 else
1664 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1665 break;
1666
1667 case EXT3_MOUNT_ORDERED_DATA:
1668 case EXT3_MOUNT_WRITEBACK_DATA:
1669 if (!journal_check_available_features
1670 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1671 printk(KERN_ERR "EXT3-fs: Journal does not support "
1672 "requested data journaling mode\n");
1673 goto failed_mount3;
1674 }
1675 default:
1676 break;
1677 }
1678
1679 if (test_opt(sb, NOBH)) {
1680 if (sb->s_blocksize_bits != PAGE_CACHE_SHIFT) {
1681 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option "
1682 "since filesystem blocksize doesn't match "
1683 "pagesize\n");
1684 clear_opt(sbi->s_mount_opt, NOBH);
1685 }
1686 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1687 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1688 "its supported only with writeback mode\n");
1689 clear_opt(sbi->s_mount_opt, NOBH);
1690 }
1691 }
1692 /*
1693 * The journal_load will have done any necessary log recovery,
1694 * so we can safely mount the rest of the filesystem now.
1695 */
1696
1697 root = iget(sb, EXT3_ROOT_INO);
1698 sb->s_root = d_alloc_root(root);
1699 if (!sb->s_root) {
1700 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1701 iput(root);
1702 goto failed_mount3;
1703 }
1704 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1705 dput(sb->s_root);
1706 sb->s_root = NULL;
1707 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1708 goto failed_mount3;
1709 }
1710
1711 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1712 /*
1713 * akpm: core read_super() calls in here with the superblock locked.
1714 * That deadlocks, because orphan cleanup needs to lock the superblock
1715 * in numerous places. Here we just pop the lock - it's relatively
1716 * harmless, because we are now ready to accept write_super() requests,
1717 * and aviro says that's the only reason for hanging onto the
1718 * superblock lock.
1719 */
1720 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1721 ext3_orphan_cleanup(sb, es);
1722 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1723 if (needs_recovery)
1724 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1725 ext3_mark_recovery_complete(sb, es);
1726 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1727 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1728 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1729 "writeback");
1730
1731 percpu_counter_mod(&sbi->s_freeblocks_counter,
1732 ext3_count_free_blocks(sb));
1733 percpu_counter_mod(&sbi->s_freeinodes_counter,
1734 ext3_count_free_inodes(sb));
1735 percpu_counter_mod(&sbi->s_dirs_counter,
1736 ext3_count_dirs(sb));
1737
1738 lock_kernel();
1739 return 0;
1740
1741 cantfind_ext3:
1742 if (!silent)
1743 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1744 sb->s_id);
1745 goto failed_mount;
1746
1747 failed_mount3:
1748 journal_destroy(sbi->s_journal);
1749 failed_mount2:
1750 for (i = 0; i < db_count; i++)
1751 brelse(sbi->s_group_desc[i]);
1752 kfree(sbi->s_group_desc);
1753 failed_mount:
1754 #ifdef CONFIG_QUOTA
1755 for (i = 0; i < MAXQUOTAS; i++)
1756 kfree(sbi->s_qf_names[i]);
1757 #endif
1758 ext3_blkdev_remove(sbi);
1759 brelse(bh);
1760 out_fail:
1761 sb->s_fs_info = NULL;
1762 kfree(sbi);
1763 lock_kernel();
1764 return -EINVAL;
1765 }
1766
1767 /*
1768 * Setup any per-fs journal parameters now. We'll do this both on
1769 * initial mount, once the journal has been initialised but before we've
1770 * done any recovery; and again on any subsequent remount.
1771 */
1772 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1773 {
1774 struct ext3_sb_info *sbi = EXT3_SB(sb);
1775
1776 if (sbi->s_commit_interval)
1777 journal->j_commit_interval = sbi->s_commit_interval;
1778 /* We could also set up an ext3-specific default for the commit
1779 * interval here, but for now we'll just fall back to the jbd
1780 * default. */
1781
1782 spin_lock(&journal->j_state_lock);
1783 if (test_opt(sb, BARRIER))
1784 journal->j_flags |= JFS_BARRIER;
1785 else
1786 journal->j_flags &= ~JFS_BARRIER;
1787 spin_unlock(&journal->j_state_lock);
1788 }
1789
1790 static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1791 {
1792 struct inode *journal_inode;
1793 journal_t *journal;
1794
1795 /* First, test for the existence of a valid inode on disk. Bad
1796 * things happen if we iget() an unused inode, as the subsequent
1797 * iput() will try to delete it. */
1798
1799 journal_inode = iget(sb, journal_inum);
1800 if (!journal_inode) {
1801 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1802 return NULL;
1803 }
1804 if (!journal_inode->i_nlink) {
1805 make_bad_inode(journal_inode);
1806 iput(journal_inode);
1807 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1808 return NULL;
1809 }
1810
1811 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1812 journal_inode, journal_inode->i_size);
1813 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1814 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1815 iput(journal_inode);
1816 return NULL;
1817 }
1818
1819 journal = journal_init_inode(journal_inode);
1820 if (!journal) {
1821 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1822 iput(journal_inode);
1823 return NULL;
1824 }
1825 journal->j_private = sb;
1826 ext3_init_journal_params(sb, journal);
1827 return journal;
1828 }
1829
1830 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1831 dev_t j_dev)
1832 {
1833 struct buffer_head * bh;
1834 journal_t *journal;
1835 int start;
1836 int len;
1837 int hblock, blocksize;
1838 unsigned long sb_block;
1839 unsigned long offset;
1840 struct ext3_super_block * es;
1841 struct block_device *bdev;
1842
1843 bdev = ext3_blkdev_get(j_dev);
1844 if (bdev == NULL)
1845 return NULL;
1846
1847 if (bd_claim(bdev, sb)) {
1848 printk(KERN_ERR
1849 "EXT3: failed to claim external journal device.\n");
1850 blkdev_put(bdev);
1851 return NULL;
1852 }
1853
1854 blocksize = sb->s_blocksize;
1855 hblock = bdev_hardsect_size(bdev);
1856 if (blocksize < hblock) {
1857 printk(KERN_ERR
1858 "EXT3-fs: blocksize too small for journal device.\n");
1859 goto out_bdev;
1860 }
1861
1862 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1863 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1864 set_blocksize(bdev, blocksize);
1865 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1866 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1867 "external journal\n");
1868 goto out_bdev;
1869 }
1870
1871 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1872 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1873 !(le32_to_cpu(es->s_feature_incompat) &
1874 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1875 printk(KERN_ERR "EXT3-fs: external journal has "
1876 "bad superblock\n");
1877 brelse(bh);
1878 goto out_bdev;
1879 }
1880
1881 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1882 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1883 brelse(bh);
1884 goto out_bdev;
1885 }
1886
1887 len = le32_to_cpu(es->s_blocks_count);
1888 start = sb_block + 1;
1889 brelse(bh); /* we're done with the superblock */
1890
1891 journal = journal_init_dev(bdev, sb->s_bdev,
1892 start, len, blocksize);
1893 if (!journal) {
1894 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1895 goto out_bdev;
1896 }
1897 journal->j_private = sb;
1898 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1899 wait_on_buffer(journal->j_sb_buffer);
1900 if (!buffer_uptodate(journal->j_sb_buffer)) {
1901 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1902 goto out_journal;
1903 }
1904 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1905 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1906 "user (unsupported) - %d\n",
1907 be32_to_cpu(journal->j_superblock->s_nr_users));
1908 goto out_journal;
1909 }
1910 EXT3_SB(sb)->journal_bdev = bdev;
1911 ext3_init_journal_params(sb, journal);
1912 return journal;
1913 out_journal:
1914 journal_destroy(journal);
1915 out_bdev:
1916 ext3_blkdev_put(bdev);
1917 return NULL;
1918 }
1919
1920 static int ext3_load_journal(struct super_block *sb,
1921 struct ext3_super_block *es,
1922 unsigned long journal_devnum)
1923 {
1924 journal_t *journal;
1925 int journal_inum = le32_to_cpu(es->s_journal_inum);
1926 dev_t journal_dev;
1927 int err = 0;
1928 int really_read_only;
1929
1930 if (journal_devnum &&
1931 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1932 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
1933 "numbers have changed\n");
1934 journal_dev = new_decode_dev(journal_devnum);
1935 } else
1936 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1937
1938 really_read_only = bdev_read_only(sb->s_bdev);
1939
1940 /*
1941 * Are we loading a blank journal or performing recovery after a
1942 * crash? For recovery, we need to check in advance whether we
1943 * can get read-write access to the device.
1944 */
1945
1946 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1947 if (sb->s_flags & MS_RDONLY) {
1948 printk(KERN_INFO "EXT3-fs: INFO: recovery "
1949 "required on readonly filesystem.\n");
1950 if (really_read_only) {
1951 printk(KERN_ERR "EXT3-fs: write access "
1952 "unavailable, cannot proceed.\n");
1953 return -EROFS;
1954 }
1955 printk (KERN_INFO "EXT3-fs: write access will "
1956 "be enabled during recovery.\n");
1957 }
1958 }
1959
1960 if (journal_inum && journal_dev) {
1961 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1962 "and inode journals!\n");
1963 return -EINVAL;
1964 }
1965
1966 if (journal_inum) {
1967 if (!(journal = ext3_get_journal(sb, journal_inum)))
1968 return -EINVAL;
1969 } else {
1970 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1971 return -EINVAL;
1972 }
1973
1974 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1975 err = journal_update_format(journal);
1976 if (err) {
1977 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1978 journal_destroy(journal);
1979 return err;
1980 }
1981 }
1982
1983 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1984 err = journal_wipe(journal, !really_read_only);
1985 if (!err)
1986 err = journal_load(journal);
1987
1988 if (err) {
1989 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
1990 journal_destroy(journal);
1991 return err;
1992 }
1993
1994 EXT3_SB(sb)->s_journal = journal;
1995 ext3_clear_journal_err(sb, es);
1996
1997 if (journal_devnum &&
1998 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1999 es->s_journal_dev = cpu_to_le32(journal_devnum);
2000 sb->s_dirt = 1;
2001
2002 /* Make sure we flush the recovery flag to disk. */
2003 ext3_commit_super(sb, es, 1);
2004 }
2005
2006 return 0;
2007 }
2008
2009 static int ext3_create_journal(struct super_block * sb,
2010 struct ext3_super_block * es,
2011 int journal_inum)
2012 {
2013 journal_t *journal;
2014
2015 if (sb->s_flags & MS_RDONLY) {
2016 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2017 "create journal.\n");
2018 return -EROFS;
2019 }
2020
2021 if (!(journal = ext3_get_journal(sb, journal_inum)))
2022 return -EINVAL;
2023
2024 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
2025 journal_inum);
2026
2027 if (journal_create(journal)) {
2028 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2029 journal_destroy(journal);
2030 return -EIO;
2031 }
2032
2033 EXT3_SB(sb)->s_journal = journal;
2034
2035 ext3_update_dynamic_rev(sb);
2036 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2037 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2038
2039 es->s_journal_inum = cpu_to_le32(journal_inum);
2040 sb->s_dirt = 1;
2041
2042 /* Make sure we flush the recovery flag to disk. */
2043 ext3_commit_super(sb, es, 1);
2044
2045 return 0;
2046 }
2047
2048 static void ext3_commit_super (struct super_block * sb,
2049 struct ext3_super_block * es,
2050 int sync)
2051 {
2052 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2053
2054 if (!sbh)
2055 return;
2056 es->s_wtime = cpu_to_le32(get_seconds());
2057 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2058 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2059 BUFFER_TRACE(sbh, "marking dirty");
2060 mark_buffer_dirty(sbh);
2061 if (sync)
2062 sync_dirty_buffer(sbh);
2063 }
2064
2065
2066 /*
2067 * Have we just finished recovery? If so, and if we are mounting (or
2068 * remounting) the filesystem readonly, then we will end up with a
2069 * consistent fs on disk. Record that fact.
2070 */
2071 static void ext3_mark_recovery_complete(struct super_block * sb,
2072 struct ext3_super_block * es)
2073 {
2074 journal_t *journal = EXT3_SB(sb)->s_journal;
2075
2076 journal_lock_updates(journal);
2077 journal_flush(journal);
2078 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2079 sb->s_flags & MS_RDONLY) {
2080 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2081 sb->s_dirt = 0;
2082 ext3_commit_super(sb, es, 1);
2083 }
2084 journal_unlock_updates(journal);
2085 }
2086
2087 /*
2088 * If we are mounting (or read-write remounting) a filesystem whose journal
2089 * has recorded an error from a previous lifetime, move that error to the
2090 * main filesystem now.
2091 */
2092 static void ext3_clear_journal_err(struct super_block * sb,
2093 struct ext3_super_block * es)
2094 {
2095 journal_t *journal;
2096 int j_errno;
2097 const char *errstr;
2098
2099 journal = EXT3_SB(sb)->s_journal;
2100
2101 /*
2102 * Now check for any error status which may have been recorded in the
2103 * journal by a prior ext3_error() or ext3_abort()
2104 */
2105
2106 j_errno = journal_errno(journal);
2107 if (j_errno) {
2108 char nbuf[16];
2109
2110 errstr = ext3_decode_error(sb, j_errno, nbuf);
2111 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2112 "from previous mount: %s", errstr);
2113 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2114 "filesystem check.");
2115
2116 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2117 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2118 ext3_commit_super (sb, es, 1);
2119
2120 journal_clear_err(journal);
2121 }
2122 }
2123
2124 /*
2125 * Force the running and committing transactions to commit,
2126 * and wait on the commit.
2127 */
2128 int ext3_force_commit(struct super_block *sb)
2129 {
2130 journal_t *journal;
2131 int ret;
2132
2133 if (sb->s_flags & MS_RDONLY)
2134 return 0;
2135
2136 journal = EXT3_SB(sb)->s_journal;
2137 sb->s_dirt = 0;
2138 ret = ext3_journal_force_commit(journal);
2139 return ret;
2140 }
2141
2142 /*
2143 * Ext3 always journals updates to the superblock itself, so we don't
2144 * have to propagate any other updates to the superblock on disk at this
2145 * point. Just start an async writeback to get the buffers on their way
2146 * to the disk.
2147 *
2148 * This implicitly triggers the writebehind on sync().
2149 */
2150
2151 static void ext3_write_super (struct super_block * sb)
2152 {
2153 if (mutex_trylock(&sb->s_lock) != 0)
2154 BUG();
2155 sb->s_dirt = 0;
2156 }
2157
2158 static int ext3_sync_fs(struct super_block *sb, int wait)
2159 {
2160 tid_t target;
2161
2162 sb->s_dirt = 0;
2163 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2164 if (wait)
2165 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2166 }
2167 return 0;
2168 }
2169
2170 /*
2171 * LVM calls this function before a (read-only) snapshot is created. This
2172 * gives us a chance to flush the journal completely and mark the fs clean.
2173 */
2174 static void ext3_write_super_lockfs(struct super_block *sb)
2175 {
2176 sb->s_dirt = 0;
2177
2178 if (!(sb->s_flags & MS_RDONLY)) {
2179 journal_t *journal = EXT3_SB(sb)->s_journal;
2180
2181 /* Now we set up the journal barrier. */
2182 journal_lock_updates(journal);
2183 journal_flush(journal);
2184
2185 /* Journal blocked and flushed, clear needs_recovery flag. */
2186 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2187 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2188 }
2189 }
2190
2191 /*
2192 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2193 * flag here, even though the filesystem is not technically dirty yet.
2194 */
2195 static void ext3_unlockfs(struct super_block *sb)
2196 {
2197 if (!(sb->s_flags & MS_RDONLY)) {
2198 lock_super(sb);
2199 /* Reser the needs_recovery flag before the fs is unlocked. */
2200 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2201 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2202 unlock_super(sb);
2203 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2204 }
2205 }
2206
2207 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2208 {
2209 struct ext3_super_block * es;
2210 struct ext3_sb_info *sbi = EXT3_SB(sb);
2211 unsigned long n_blocks_count = 0;
2212 unsigned long old_sb_flags;
2213 struct ext3_mount_options old_opts;
2214 int err;
2215 #ifdef CONFIG_QUOTA
2216 int i;
2217 #endif
2218
2219 /* Store the original options */
2220 old_sb_flags = sb->s_flags;
2221 old_opts.s_mount_opt = sbi->s_mount_opt;
2222 old_opts.s_resuid = sbi->s_resuid;
2223 old_opts.s_resgid = sbi->s_resgid;
2224 old_opts.s_commit_interval = sbi->s_commit_interval;
2225 #ifdef CONFIG_QUOTA
2226 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2227 for (i = 0; i < MAXQUOTAS; i++)
2228 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2229 #endif
2230
2231 /*
2232 * Allow the "check" option to be passed as a remount option.
2233 */
2234 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2235 err = -EINVAL;
2236 goto restore_opts;
2237 }
2238
2239 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2240 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2241
2242 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2243 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2244
2245 es = sbi->s_es;
2246
2247 ext3_init_journal_params(sb, sbi->s_journal);
2248
2249 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2250 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2251 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2252 err = -EROFS;
2253 goto restore_opts;
2254 }
2255
2256 if (*flags & MS_RDONLY) {
2257 /*
2258 * First of all, the unconditional stuff we have to do
2259 * to disable replay of the journal when we next remount
2260 */
2261 sb->s_flags |= MS_RDONLY;
2262
2263 /*
2264 * OK, test if we are remounting a valid rw partition
2265 * readonly, and if so set the rdonly flag and then
2266 * mark the partition as valid again.
2267 */
2268 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2269 (sbi->s_mount_state & EXT3_VALID_FS))
2270 es->s_state = cpu_to_le16(sbi->s_mount_state);
2271
2272 ext3_mark_recovery_complete(sb, es);
2273 } else {
2274 __le32 ret;
2275 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2276 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2277 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2278 "remount RDWR because of unsupported "
2279 "optional features (%x).\n",
2280 sb->s_id, le32_to_cpu(ret));
2281 err = -EROFS;
2282 goto restore_opts;
2283 }
2284 /*
2285 * Mounting a RDONLY partition read-write, so reread
2286 * and store the current valid flag. (It may have
2287 * been changed by e2fsck since we originally mounted
2288 * the partition.)
2289 */
2290 ext3_clear_journal_err(sb, es);
2291 sbi->s_mount_state = le16_to_cpu(es->s_state);
2292 if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2293 err = ret;
2294 goto restore_opts;
2295 }
2296 if (!ext3_setup_super (sb, es, 0))
2297 sb->s_flags &= ~MS_RDONLY;
2298 }
2299 }
2300 #ifdef CONFIG_QUOTA
2301 /* Release old quota file names */
2302 for (i = 0; i < MAXQUOTAS; i++)
2303 if (old_opts.s_qf_names[i] &&
2304 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2305 kfree(old_opts.s_qf_names[i]);
2306 #endif
2307 return 0;
2308 restore_opts:
2309 sb->s_flags = old_sb_flags;
2310 sbi->s_mount_opt = old_opts.s_mount_opt;
2311 sbi->s_resuid = old_opts.s_resuid;
2312 sbi->s_resgid = old_opts.s_resgid;
2313 sbi->s_commit_interval = old_opts.s_commit_interval;
2314 #ifdef CONFIG_QUOTA
2315 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2316 for (i = 0; i < MAXQUOTAS; i++) {
2317 if (sbi->s_qf_names[i] &&
2318 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2319 kfree(sbi->s_qf_names[i]);
2320 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2321 }
2322 #endif
2323 return err;
2324 }
2325
2326 static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
2327 {
2328 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
2329 unsigned long overhead;
2330 int i;
2331
2332 if (test_opt (sb, MINIX_DF))
2333 overhead = 0;
2334 else {
2335 unsigned long ngroups;
2336 ngroups = EXT3_SB(sb)->s_groups_count;
2337 smp_rmb();
2338
2339 /*
2340 * Compute the overhead (FS structures)
2341 */
2342
2343 /*
2344 * All of the blocks before first_data_block are
2345 * overhead
2346 */
2347 overhead = le32_to_cpu(es->s_first_data_block);
2348
2349 /*
2350 * Add the overhead attributed to the superblock and
2351 * block group descriptors. If the sparse superblocks
2352 * feature is turned on, then not all groups have this.
2353 */
2354 for (i = 0; i < ngroups; i++) {
2355 overhead += ext3_bg_has_super(sb, i) +
2356 ext3_bg_num_gdb(sb, i);
2357 cond_resched();
2358 }
2359
2360 /*
2361 * Every block group has an inode bitmap, a block
2362 * bitmap, and an inode table.
2363 */
2364 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2365 }
2366
2367 buf->f_type = EXT3_SUPER_MAGIC;
2368 buf->f_bsize = sb->s_blocksize;
2369 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2370 buf->f_bfree = ext3_count_free_blocks (sb);
2371 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2372 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2373 buf->f_bavail = 0;
2374 buf->f_files = le32_to_cpu(es->s_inodes_count);
2375 buf->f_ffree = ext3_count_free_inodes (sb);
2376 buf->f_namelen = EXT3_NAME_LEN;
2377 return 0;
2378 }
2379
2380 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2381 * is locked for write. Otherwise the are possible deadlocks:
2382 * Process 1 Process 2
2383 * ext3_create() quota_sync()
2384 * journal_start() write_dquot()
2385 * DQUOT_INIT() down(dqio_sem)
2386 * down(dqio_sem) journal_start()
2387 *
2388 */
2389
2390 #ifdef CONFIG_QUOTA
2391
2392 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2393 {
2394 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2395 }
2396
2397 static int ext3_dquot_initialize(struct inode *inode, int type)
2398 {
2399 handle_t *handle;
2400 int ret, err;
2401
2402 /* We may create quota structure so we need to reserve enough blocks */
2403 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2404 if (IS_ERR(handle))
2405 return PTR_ERR(handle);
2406 ret = dquot_initialize(inode, type);
2407 err = ext3_journal_stop(handle);
2408 if (!ret)
2409 ret = err;
2410 return ret;
2411 }
2412
2413 static int ext3_dquot_drop(struct inode *inode)
2414 {
2415 handle_t *handle;
2416 int ret, err;
2417
2418 /* We may delete quota structure so we need to reserve enough blocks */
2419 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2420 if (IS_ERR(handle))
2421 return PTR_ERR(handle);
2422 ret = dquot_drop(inode);
2423 err = ext3_journal_stop(handle);
2424 if (!ret)
2425 ret = err;
2426 return ret;
2427 }
2428
2429 static int ext3_write_dquot(struct dquot *dquot)
2430 {
2431 int ret, err;
2432 handle_t *handle;
2433 struct inode *inode;
2434
2435 inode = dquot_to_inode(dquot);
2436 handle = ext3_journal_start(inode,
2437 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2438 if (IS_ERR(handle))
2439 return PTR_ERR(handle);
2440 ret = dquot_commit(dquot);
2441 err = ext3_journal_stop(handle);
2442 if (!ret)
2443 ret = err;
2444 return ret;
2445 }
2446
2447 static int ext3_acquire_dquot(struct dquot *dquot)
2448 {
2449 int ret, err;
2450 handle_t *handle;
2451
2452 handle = ext3_journal_start(dquot_to_inode(dquot),
2453 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2454 if (IS_ERR(handle))
2455 return PTR_ERR(handle);
2456 ret = dquot_acquire(dquot);
2457 err = ext3_journal_stop(handle);
2458 if (!ret)
2459 ret = err;
2460 return ret;
2461 }
2462
2463 static int ext3_release_dquot(struct dquot *dquot)
2464 {
2465 int ret, err;
2466 handle_t *handle;
2467
2468 handle = ext3_journal_start(dquot_to_inode(dquot),
2469 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2470 if (IS_ERR(handle))
2471 return PTR_ERR(handle);
2472 ret = dquot_release(dquot);
2473 err = ext3_journal_stop(handle);
2474 if (!ret)
2475 ret = err;
2476 return ret;
2477 }
2478
2479 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2480 {
2481 /* Are we journalling quotas? */
2482 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2483 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2484 dquot_mark_dquot_dirty(dquot);
2485 return ext3_write_dquot(dquot);
2486 } else {
2487 return dquot_mark_dquot_dirty(dquot);
2488 }
2489 }
2490
2491 static int ext3_write_info(struct super_block *sb, int type)
2492 {
2493 int ret, err;
2494 handle_t *handle;
2495
2496 /* Data block + inode block */
2497 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2498 if (IS_ERR(handle))
2499 return PTR_ERR(handle);
2500 ret = dquot_commit_info(sb, type);
2501 err = ext3_journal_stop(handle);
2502 if (!ret)
2503 ret = err;
2504 return ret;
2505 }
2506
2507 /*
2508 * Turn on quotas during mount time - we need to find
2509 * the quota file and such...
2510 */
2511 static int ext3_quota_on_mount(struct super_block *sb, int type)
2512 {
2513 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2514 EXT3_SB(sb)->s_jquota_fmt, type);
2515 }
2516
2517 /*
2518 * Standard function to be called on quota_on
2519 */
2520 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2521 char *path)
2522 {
2523 int err;
2524 struct nameidata nd;
2525
2526 if (!test_opt(sb, QUOTA))
2527 return -EINVAL;
2528 /* Not journalling quota? */
2529 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2530 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2531 return vfs_quota_on(sb, type, format_id, path);
2532 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2533 if (err)
2534 return err;
2535 /* Quotafile not on the same filesystem? */
2536 if (nd.mnt->mnt_sb != sb) {
2537 path_release(&nd);
2538 return -EXDEV;
2539 }
2540 /* Quotafile not of fs root? */
2541 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2542 printk(KERN_WARNING
2543 "EXT3-fs: Quota file not on filesystem root. "
2544 "Journalled quota will not work.\n");
2545 path_release(&nd);
2546 return vfs_quota_on(sb, type, format_id, path);
2547 }
2548
2549 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2550 * acquiring the locks... As quota files are never truncated and quota code
2551 * itself serializes the operations (and noone else should touch the files)
2552 * we don't have to be afraid of races */
2553 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2554 size_t len, loff_t off)
2555 {
2556 struct inode *inode = sb_dqopt(sb)->files[type];
2557 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2558 int err = 0;
2559 int offset = off & (sb->s_blocksize - 1);
2560 int tocopy;
2561 size_t toread;
2562 struct buffer_head *bh;
2563 loff_t i_size = i_size_read(inode);
2564
2565 if (off > i_size)
2566 return 0;
2567 if (off+len > i_size)
2568 len = i_size-off;
2569 toread = len;
2570 while (toread > 0) {
2571 tocopy = sb->s_blocksize - offset < toread ?
2572 sb->s_blocksize - offset : toread;
2573 bh = ext3_bread(NULL, inode, blk, 0, &err);
2574 if (err)
2575 return err;
2576 if (!bh) /* A hole? */
2577 memset(data, 0, tocopy);
2578 else
2579 memcpy(data, bh->b_data+offset, tocopy);
2580 brelse(bh);
2581 offset = 0;
2582 toread -= tocopy;
2583 data += tocopy;
2584 blk++;
2585 }
2586 return len;
2587 }
2588
2589 /* Write to quotafile (we know the transaction is already started and has
2590 * enough credits) */
2591 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2592 const char *data, size_t len, loff_t off)
2593 {
2594 struct inode *inode = sb_dqopt(sb)->files[type];
2595 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2596 int err = 0;
2597 int offset = off & (sb->s_blocksize - 1);
2598 int tocopy;
2599 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2600 size_t towrite = len;
2601 struct buffer_head *bh;
2602 handle_t *handle = journal_current_handle();
2603
2604 mutex_lock(&inode->i_mutex);
2605 while (towrite > 0) {
2606 tocopy = sb->s_blocksize - offset < towrite ?
2607 sb->s_blocksize - offset : towrite;
2608 bh = ext3_bread(handle, inode, blk, 1, &err);
2609 if (!bh)
2610 goto out;
2611 if (journal_quota) {
2612 err = ext3_journal_get_write_access(handle, bh);
2613 if (err) {
2614 brelse(bh);
2615 goto out;
2616 }
2617 }
2618 lock_buffer(bh);
2619 memcpy(bh->b_data+offset, data, tocopy);
2620 flush_dcache_page(bh->b_page);
2621 unlock_buffer(bh);
2622 if (journal_quota)
2623 err = ext3_journal_dirty_metadata(handle, bh);
2624 else {
2625 /* Always do at least ordered writes for quotas */
2626 err = ext3_journal_dirty_data(handle, bh);
2627 mark_buffer_dirty(bh);
2628 }
2629 brelse(bh);
2630 if (err)
2631 goto out;
2632 offset = 0;
2633 towrite -= tocopy;
2634 data += tocopy;
2635 blk++;
2636 }
2637 out:
2638 if (len == towrite)
2639 return err;
2640 if (inode->i_size < off+len-towrite) {
2641 i_size_write(inode, off+len-towrite);
2642 EXT3_I(inode)->i_disksize = inode->i_size;
2643 }
2644 inode->i_version++;
2645 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2646 ext3_mark_inode_dirty(handle, inode);
2647 mutex_unlock(&inode->i_mutex);
2648 return len - towrite;
2649 }
2650
2651 #endif
2652
2653 static struct super_block *ext3_get_sb(struct file_system_type *fs_type,
2654 int flags, const char *dev_name, void *data)
2655 {
2656 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
2657 }
2658
2659 static struct file_system_type ext3_fs_type = {
2660 .owner = THIS_MODULE,
2661 .name = "ext3",
2662 .get_sb = ext3_get_sb,
2663 .kill_sb = kill_block_super,
2664 .fs_flags = FS_REQUIRES_DEV,
2665 };
2666
2667 static int __init init_ext3_fs(void)
2668 {
2669 int err = init_ext3_xattr();
2670 if (err)
2671 return err;
2672 err = init_inodecache();
2673 if (err)
2674 goto out1;
2675 err = register_filesystem(&ext3_fs_type);
2676 if (err)
2677 goto out;
2678 return 0;
2679 out:
2680 destroy_inodecache();
2681 out1:
2682 exit_ext3_xattr();
2683 return err;
2684 }
2685
2686 static void __exit exit_ext3_fs(void)
2687 {
2688 unregister_filesystem(&ext3_fs_type);
2689 destroy_inodecache();
2690 exit_ext3_xattr();
2691 }
2692
2693 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2694 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2695 MODULE_LICENSE("GPL");
2696 module_init(init_ext3_fs)
2697 module_exit(exit_ext3_fs)
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