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Automatic merge of rsync://rsync.kernel.org/pub/scm/linux/kernel/git/gregkh/driver...
[linux-2.6/verdex.git] / fs / ext3 / super.c
blob981ccb233ef5e29949152a6dea0aeb55edc84b8c
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 <asm/uaccess.h>
39 #include "xattr.h"
40 #include "acl.h"
41
42 static int ext3_load_journal(struct super_block *, struct ext3_super_block *);
43 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
44 int);
45 static void ext3_commit_super (struct super_block * sb,
46 struct ext3_super_block * es,
47 int sync);
48 static void ext3_mark_recovery_complete(struct super_block * sb,
49 struct ext3_super_block * es);
50 static void ext3_clear_journal_err(struct super_block * sb,
51 struct ext3_super_block * es);
52 static int ext3_sync_fs(struct super_block *sb, int wait);
53 static const char *ext3_decode_error(struct super_block * sb, int errno,
54 char nbuf[16]);
55 static int ext3_remount (struct super_block * sb, int * flags, char * data);
56 static int ext3_statfs (struct super_block * sb, struct kstatfs * buf);
57 static void ext3_unlockfs(struct super_block *sb);
58 static void ext3_write_super (struct super_block * sb);
59 static void ext3_write_super_lockfs(struct super_block *sb);
60
61 /*
62 * Wrappers for journal_start/end.
63 *
64 * The only special thing we need to do here is to make sure that all
65 * journal_end calls result in the superblock being marked dirty, so
66 * that sync() will call the filesystem's write_super callback if
67 * appropriate.
68 */
69 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
70 {
71 journal_t *journal;
72
73 if (sb->s_flags & MS_RDONLY)
74 return ERR_PTR(-EROFS);
75
76 /* Special case here: if the journal has aborted behind our
77 * backs (eg. EIO in the commit thread), then we still need to
78 * take the FS itself readonly cleanly. */
79 journal = EXT3_SB(sb)->s_journal;
80 if (is_journal_aborted(journal)) {
81 ext3_abort(sb, __FUNCTION__,
82 "Detected aborted journal");
83 return ERR_PTR(-EROFS);
84 }
85
86 return journal_start(journal, nblocks);
87 }
88
89 /*
90 * The only special thing we need to do here is to make sure that all
91 * journal_stop calls result in the superblock being marked dirty, so
92 * that sync() will call the filesystem's write_super callback if
93 * appropriate.
94 */
95 int __ext3_journal_stop(const char *where, handle_t *handle)
96 {
97 struct super_block *sb;
98 int err;
99 int rc;
100
101 sb = handle->h_transaction->t_journal->j_private;
102 err = handle->h_err;
103 rc = journal_stop(handle);
104
105 if (!err)
106 err = rc;
107 if (err)
108 __ext3_std_error(sb, where, err);
109 return err;
110 }
111
112 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
113 struct buffer_head *bh, handle_t *handle, int err)
114 {
115 char nbuf[16];
116 const char *errstr = ext3_decode_error(NULL, err, nbuf);
117
118 if (bh)
119 BUFFER_TRACE(bh, "abort");
120
121 if (!handle->h_err)
122 handle->h_err = err;
123
124 if (is_handle_aborted(handle))
125 return;
126
127 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
128 caller, errstr, err_fn);
129
130 journal_abort_handle(handle);
131 }
132
133 /* Deal with the reporting of failure conditions on a filesystem such as
134 * inconsistencies detected or read IO failures.
135 *
136 * On ext2, we can store the error state of the filesystem in the
137 * superblock. That is not possible on ext3, because we may have other
138 * write ordering constraints on the superblock which prevent us from
139 * writing it out straight away; and given that the journal is about to
140 * be aborted, we can't rely on the current, or future, transactions to
141 * write out the superblock safely.
142 *
143 * We'll just use the journal_abort() error code to record an error in
144 * the journal instead. On recovery, the journal will compain about
145 * that error until we've noted it down and cleared it.
146 */
147
148 static void ext3_handle_error(struct super_block *sb)
149 {
150 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
151
152 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
153 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
154
155 if (sb->s_flags & MS_RDONLY)
156 return;
157
158 if (test_opt (sb, ERRORS_RO)) {
159 printk (KERN_CRIT "Remounting filesystem read-only\n");
160 sb->s_flags |= MS_RDONLY;
161 } else {
162 journal_t *journal = EXT3_SB(sb)->s_journal;
163
164 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
165 if (journal)
166 journal_abort(journal, -EIO);
167 }
168 if (test_opt(sb, ERRORS_PANIC))
169 panic("EXT3-fs (device %s): panic forced after error\n",
170 sb->s_id);
171 ext3_commit_super(sb, es, 1);
172 }
173
174 void ext3_error (struct super_block * sb, const char * function,
175 const char * fmt, ...)
176 {
177 va_list args;
178
179 va_start(args, fmt);
180 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
181 vprintk(fmt, args);
182 printk("\n");
183 va_end(args);
184
185 ext3_handle_error(sb);
186 }
187
188 static const char *ext3_decode_error(struct super_block * sb, int errno,
189 char nbuf[16])
190 {
191 char *errstr = NULL;
192
193 switch (errno) {
194 case -EIO:
195 errstr = "IO failure";
196 break;
197 case -ENOMEM:
198 errstr = "Out of memory";
199 break;
200 case -EROFS:
201 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
202 errstr = "Journal has aborted";
203 else
204 errstr = "Readonly filesystem";
205 break;
206 default:
207 /* If the caller passed in an extra buffer for unknown
208 * errors, textualise them now. Else we just return
209 * NULL. */
210 if (nbuf) {
211 /* Check for truncated error codes... */
212 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
213 errstr = nbuf;
214 }
215 break;
216 }
217
218 return errstr;
219 }
220
221 /* __ext3_std_error decodes expected errors from journaling functions
222 * automatically and invokes the appropriate error response. */
223
224 void __ext3_std_error (struct super_block * sb, const char * function,
225 int errno)
226 {
227 char nbuf[16];
228 const char *errstr;
229
230 /* Special case: if the error is EROFS, and we're not already
231 * inside a transaction, then there's really no point in logging
232 * an error. */
233 if (errno == -EROFS && journal_current_handle() == NULL &&
234 (sb->s_flags & MS_RDONLY))
235 return;
236
237 errstr = ext3_decode_error(sb, errno, nbuf);
238 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
239 sb->s_id, function, errstr);
240
241 ext3_handle_error(sb);
242 }
243
244 /*
245 * ext3_abort is a much stronger failure handler than ext3_error. The
246 * abort function may be used to deal with unrecoverable failures such
247 * as journal IO errors or ENOMEM at a critical moment in log management.
248 *
249 * We unconditionally force the filesystem into an ABORT|READONLY state,
250 * unless the error response on the fs has been set to panic in which
251 * case we take the easy way out and panic immediately.
252 */
253
254 void ext3_abort (struct super_block * sb, const char * function,
255 const char * fmt, ...)
256 {
257 va_list args;
258
259 printk (KERN_CRIT "ext3_abort called.\n");
260
261 va_start(args, fmt);
262 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
263 vprintk(fmt, args);
264 printk("\n");
265 va_end(args);
266
267 if (test_opt(sb, ERRORS_PANIC))
268 panic("EXT3-fs panic from previous error\n");
269
270 if (sb->s_flags & MS_RDONLY)
271 return;
272
273 printk(KERN_CRIT "Remounting filesystem read-only\n");
274 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
275 sb->s_flags |= MS_RDONLY;
276 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
277 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
278 }
279
280 void ext3_warning (struct super_block * sb, const char * function,
281 const char * fmt, ...)
282 {
283 va_list args;
284
285 va_start(args, fmt);
286 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
287 sb->s_id, function);
288 vprintk(fmt, args);
289 printk("\n");
290 va_end(args);
291 }
292
293 void ext3_update_dynamic_rev(struct super_block *sb)
294 {
295 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
296
297 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
298 return;
299
300 ext3_warning(sb, __FUNCTION__,
301 "updating to rev %d because of new feature flag, "
302 "running e2fsck is recommended",
303 EXT3_DYNAMIC_REV);
304
305 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
306 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
307 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
308 /* leave es->s_feature_*compat flags alone */
309 /* es->s_uuid will be set by e2fsck if empty */
310
311 /*
312 * The rest of the superblock fields should be zero, and if not it
313 * means they are likely already in use, so leave them alone. We
314 * can leave it up to e2fsck to clean up any inconsistencies there.
315 */
316 }
317
318 /*
319 * Open the external journal device
320 */
321 static struct block_device *ext3_blkdev_get(dev_t dev)
322 {
323 struct block_device *bdev;
324 char b[BDEVNAME_SIZE];
325
326 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
327 if (IS_ERR(bdev))
328 goto fail;
329 return bdev;
330
331 fail:
332 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
333 __bdevname(dev, b), PTR_ERR(bdev));
334 return NULL;
335 }
336
337 /*
338 * Release the journal device
339 */
340 static int ext3_blkdev_put(struct block_device *bdev)
341 {
342 bd_release(bdev);
343 return blkdev_put(bdev);
344 }
345
346 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
347 {
348 struct block_device *bdev;
349 int ret = -ENODEV;
350
351 bdev = sbi->journal_bdev;
352 if (bdev) {
353 ret = ext3_blkdev_put(bdev);
354 sbi->journal_bdev = NULL;
355 }
356 return ret;
357 }
358
359 static inline struct inode *orphan_list_entry(struct list_head *l)
360 {
361 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
362 }
363
364 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
365 {
366 struct list_head *l;
367
368 printk(KERN_ERR "sb orphan head is %d\n",
369 le32_to_cpu(sbi->s_es->s_last_orphan));
370
371 printk(KERN_ERR "sb_info orphan list:\n");
372 list_for_each(l, &sbi->s_orphan) {
373 struct inode *inode = orphan_list_entry(l);
374 printk(KERN_ERR " "
375 "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
376 inode->i_sb->s_id, inode->i_ino, inode,
377 inode->i_mode, inode->i_nlink,
378 NEXT_ORPHAN(inode));
379 }
380 }
381
382 static void ext3_put_super (struct super_block * sb)
383 {
384 struct ext3_sb_info *sbi = EXT3_SB(sb);
385 struct ext3_super_block *es = sbi->s_es;
386 int i;
387
388 ext3_xattr_put_super(sb);
389 journal_destroy(sbi->s_journal);
390 if (!(sb->s_flags & MS_RDONLY)) {
391 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
392 es->s_state = cpu_to_le16(sbi->s_mount_state);
393 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
394 mark_buffer_dirty(sbi->s_sbh);
395 ext3_commit_super(sb, es, 1);
396 }
397
398 for (i = 0; i < sbi->s_gdb_count; i++)
399 brelse(sbi->s_group_desc[i]);
400 kfree(sbi->s_group_desc);
401 percpu_counter_destroy(&sbi->s_freeblocks_counter);
402 percpu_counter_destroy(&sbi->s_freeinodes_counter);
403 percpu_counter_destroy(&sbi->s_dirs_counter);
404 brelse(sbi->s_sbh);
405 #ifdef CONFIG_QUOTA
406 for (i = 0; i < MAXQUOTAS; i++)
407 kfree(sbi->s_qf_names[i]);
408 #endif
409
410 /* Debugging code just in case the in-memory inode orphan list
411 * isn't empty. The on-disk one can be non-empty if we've
412 * detected an error and taken the fs readonly, but the
413 * in-memory list had better be clean by this point. */
414 if (!list_empty(&sbi->s_orphan))
415 dump_orphan_list(sb, sbi);
416 J_ASSERT(list_empty(&sbi->s_orphan));
417
418 invalidate_bdev(sb->s_bdev, 0);
419 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
420 /*
421 * Invalidate the journal device's buffers. We don't want them
422 * floating about in memory - the physical journal device may
423 * hotswapped, and it breaks the `ro-after' testing code.
424 */
425 sync_blockdev(sbi->journal_bdev);
426 invalidate_bdev(sbi->journal_bdev, 0);
427 ext3_blkdev_remove(sbi);
428 }
429 sb->s_fs_info = NULL;
430 kfree(sbi);
431 return;
432 }
433
434 static kmem_cache_t *ext3_inode_cachep;
435
436 /*
437 * Called inside transaction, so use GFP_NOFS
438 */
439 static struct inode *ext3_alloc_inode(struct super_block *sb)
440 {
441 struct ext3_inode_info *ei;
442
443 ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
444 if (!ei)
445 return NULL;
446 #ifdef CONFIG_EXT3_FS_POSIX_ACL
447 ei->i_acl = EXT3_ACL_NOT_CACHED;
448 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
449 #endif
450 ei->i_block_alloc_info = NULL;
451 ei->vfs_inode.i_version = 1;
452 return &ei->vfs_inode;
453 }
454
455 static void ext3_destroy_inode(struct inode *inode)
456 {
457 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
458 }
459
460 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
461 {
462 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
463
464 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
465 SLAB_CTOR_CONSTRUCTOR) {
466 INIT_LIST_HEAD(&ei->i_orphan);
467 #ifdef CONFIG_EXT3_FS_XATTR
468 init_rwsem(&ei->xattr_sem);
469 #endif
470 init_MUTEX(&ei->truncate_sem);
471 inode_init_once(&ei->vfs_inode);
472 }
473 }
474
475 static int init_inodecache(void)
476 {
477 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
478 sizeof(struct ext3_inode_info),
479 0, SLAB_RECLAIM_ACCOUNT,
480 init_once, NULL);
481 if (ext3_inode_cachep == NULL)
482 return -ENOMEM;
483 return 0;
484 }
485
486 static void destroy_inodecache(void)
487 {
488 if (kmem_cache_destroy(ext3_inode_cachep))
489 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
490 }
491
492 static void ext3_clear_inode(struct inode *inode)
493 {
494 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
495 #ifdef CONFIG_EXT3_FS_POSIX_ACL
496 if (EXT3_I(inode)->i_acl &&
497 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
498 posix_acl_release(EXT3_I(inode)->i_acl);
499 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
500 }
501 if (EXT3_I(inode)->i_default_acl &&
502 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
503 posix_acl_release(EXT3_I(inode)->i_default_acl);
504 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
505 }
506 #endif
507 ext3_discard_reservation(inode);
508 EXT3_I(inode)->i_block_alloc_info = NULL;
509 kfree(rsv);
510 }
511
512 #ifdef CONFIG_QUOTA
513
514 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
515 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
516
517 static int ext3_dquot_initialize(struct inode *inode, int type);
518 static int ext3_dquot_drop(struct inode *inode);
519 static int ext3_write_dquot(struct dquot *dquot);
520 static int ext3_acquire_dquot(struct dquot *dquot);
521 static int ext3_release_dquot(struct dquot *dquot);
522 static int ext3_mark_dquot_dirty(struct dquot *dquot);
523 static int ext3_write_info(struct super_block *sb, int type);
524 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
525 static int ext3_quota_on_mount(struct super_block *sb, int type);
526 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
527 size_t len, loff_t off);
528 static ssize_t ext3_quota_write(struct super_block *sb, int type,
529 const char *data, size_t len, loff_t off);
530
531 static struct dquot_operations ext3_quota_operations = {
532 .initialize = ext3_dquot_initialize,
533 .drop = ext3_dquot_drop,
534 .alloc_space = dquot_alloc_space,
535 .alloc_inode = dquot_alloc_inode,
536 .free_space = dquot_free_space,
537 .free_inode = dquot_free_inode,
538 .transfer = dquot_transfer,
539 .write_dquot = ext3_write_dquot,
540 .acquire_dquot = ext3_acquire_dquot,
541 .release_dquot = ext3_release_dquot,
542 .mark_dirty = ext3_mark_dquot_dirty,
543 .write_info = ext3_write_info
544 };
545
546 static struct quotactl_ops ext3_qctl_operations = {
547 .quota_on = ext3_quota_on,
548 .quota_off = vfs_quota_off,
549 .quota_sync = vfs_quota_sync,
550 .get_info = vfs_get_dqinfo,
551 .set_info = vfs_set_dqinfo,
552 .get_dqblk = vfs_get_dqblk,
553 .set_dqblk = vfs_set_dqblk
554 };
555 #endif
556
557 static struct super_operations ext3_sops = {
558 .alloc_inode = ext3_alloc_inode,
559 .destroy_inode = ext3_destroy_inode,
560 .read_inode = ext3_read_inode,
561 .write_inode = ext3_write_inode,
562 .dirty_inode = ext3_dirty_inode,
563 .delete_inode = ext3_delete_inode,
564 .put_super = ext3_put_super,
565 .write_super = ext3_write_super,
566 .sync_fs = ext3_sync_fs,
567 .write_super_lockfs = ext3_write_super_lockfs,
568 .unlockfs = ext3_unlockfs,
569 .statfs = ext3_statfs,
570 .remount_fs = ext3_remount,
571 .clear_inode = ext3_clear_inode,
572 #ifdef CONFIG_QUOTA
573 .quota_read = ext3_quota_read,
574 .quota_write = ext3_quota_write,
575 #endif
576 };
577
578 struct dentry *ext3_get_parent(struct dentry *child);
579 static struct export_operations ext3_export_ops = {
580 .get_parent = ext3_get_parent,
581 };
582
583 enum {
584 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
585 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
586 Opt_nouid32, Opt_check, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
587 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
588 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,
589 Opt_commit, Opt_journal_update, Opt_journal_inum,
590 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
591 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
592 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0,
593 Opt_ignore, Opt_barrier, Opt_err, Opt_resize,
594 };
595
596 static match_table_t tokens = {
597 {Opt_bsd_df, "bsddf"},
598 {Opt_minix_df, "minixdf"},
599 {Opt_grpid, "grpid"},
600 {Opt_grpid, "bsdgroups"},
601 {Opt_nogrpid, "nogrpid"},
602 {Opt_nogrpid, "sysvgroups"},
603 {Opt_resgid, "resgid=%u"},
604 {Opt_resuid, "resuid=%u"},
605 {Opt_sb, "sb=%u"},
606 {Opt_err_cont, "errors=continue"},
607 {Opt_err_panic, "errors=panic"},
608 {Opt_err_ro, "errors=remount-ro"},
609 {Opt_nouid32, "nouid32"},
610 {Opt_nocheck, "nocheck"},
611 {Opt_nocheck, "check=none"},
612 {Opt_check, "check"},
613 {Opt_debug, "debug"},
614 {Opt_oldalloc, "oldalloc"},
615 {Opt_orlov, "orlov"},
616 {Opt_user_xattr, "user_xattr"},
617 {Opt_nouser_xattr, "nouser_xattr"},
618 {Opt_acl, "acl"},
619 {Opt_noacl, "noacl"},
620 {Opt_reservation, "reservation"},
621 {Opt_noreservation, "noreservation"},
622 {Opt_noload, "noload"},
623 {Opt_nobh, "nobh"},
624 {Opt_commit, "commit=%u"},
625 {Opt_journal_update, "journal=update"},
626 {Opt_journal_inum, "journal=%u"},
627 {Opt_abort, "abort"},
628 {Opt_data_journal, "data=journal"},
629 {Opt_data_ordered, "data=ordered"},
630 {Opt_data_writeback, "data=writeback"},
631 {Opt_offusrjquota, "usrjquota="},
632 {Opt_usrjquota, "usrjquota=%s"},
633 {Opt_offgrpjquota, "grpjquota="},
634 {Opt_grpjquota, "grpjquota=%s"},
635 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
636 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
637 {Opt_ignore, "grpquota"},
638 {Opt_ignore, "noquota"},
639 {Opt_ignore, "quota"},
640 {Opt_ignore, "usrquota"},
641 {Opt_barrier, "barrier=%u"},
642 {Opt_err, NULL},
643 {Opt_resize, "resize"},
644 };
645
646 static unsigned long get_sb_block(void **data)
647 {
648 unsigned long sb_block;
649 char *options = (char *) *data;
650
651 if (!options || strncmp(options, "sb=", 3) != 0)
652 return 1; /* Default location */
653 options += 3;
654 sb_block = simple_strtoul(options, &options, 0);
655 if (*options && *options != ',') {
656 printk("EXT3-fs: Invalid sb specification: %s\n",
657 (char *) *data);
658 return 1;
659 }
660 if (*options == ',')
661 options++;
662 *data = (void *) options;
663 return sb_block;
664 }
665
666 static int parse_options (char * options, struct super_block *sb,
667 unsigned long * inum, unsigned long *n_blocks_count, int is_remount)
668 {
669 struct ext3_sb_info *sbi = EXT3_SB(sb);
670 char * p;
671 substring_t args[MAX_OPT_ARGS];
672 int data_opt = 0;
673 int option;
674 #ifdef CONFIG_QUOTA
675 int qtype;
676 char *qname;
677 #endif
678
679 if (!options)
680 return 1;
681
682 while ((p = strsep (&options, ",")) != NULL) {
683 int token;
684 if (!*p)
685 continue;
686
687 token = match_token(p, tokens, args);
688 switch (token) {
689 case Opt_bsd_df:
690 clear_opt (sbi->s_mount_opt, MINIX_DF);
691 break;
692 case Opt_minix_df:
693 set_opt (sbi->s_mount_opt, MINIX_DF);
694 break;
695 case Opt_grpid:
696 set_opt (sbi->s_mount_opt, GRPID);
697 break;
698 case Opt_nogrpid:
699 clear_opt (sbi->s_mount_opt, GRPID);
700 break;
701 case Opt_resuid:
702 if (match_int(&args[0], &option))
703 return 0;
704 sbi->s_resuid = option;
705 break;
706 case Opt_resgid:
707 if (match_int(&args[0], &option))
708 return 0;
709 sbi->s_resgid = option;
710 break;
711 case Opt_sb:
712 /* handled by get_sb_block() instead of here */
713 /* *sb_block = match_int(&args[0]); */
714 break;
715 case Opt_err_panic:
716 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
717 clear_opt (sbi->s_mount_opt, ERRORS_RO);
718 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
719 break;
720 case Opt_err_ro:
721 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
722 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
723 set_opt (sbi->s_mount_opt, ERRORS_RO);
724 break;
725 case Opt_err_cont:
726 clear_opt (sbi->s_mount_opt, ERRORS_RO);
727 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
728 set_opt (sbi->s_mount_opt, ERRORS_CONT);
729 break;
730 case Opt_nouid32:
731 set_opt (sbi->s_mount_opt, NO_UID32);
732 break;
733 case Opt_check:
734 #ifdef CONFIG_EXT3_CHECK
735 set_opt (sbi->s_mount_opt, CHECK);
736 #else
737 printk(KERN_ERR
738 "EXT3 Check option not supported\n");
739 #endif
740 break;
741 case Opt_nocheck:
742 clear_opt (sbi->s_mount_opt, CHECK);
743 break;
744 case Opt_debug:
745 set_opt (sbi->s_mount_opt, DEBUG);
746 break;
747 case Opt_oldalloc:
748 set_opt (sbi->s_mount_opt, OLDALLOC);
749 break;
750 case Opt_orlov:
751 clear_opt (sbi->s_mount_opt, OLDALLOC);
752 break;
753 #ifdef CONFIG_EXT3_FS_XATTR
754 case Opt_user_xattr:
755 set_opt (sbi->s_mount_opt, XATTR_USER);
756 break;
757 case Opt_nouser_xattr:
758 clear_opt (sbi->s_mount_opt, XATTR_USER);
759 break;
760 #else
761 case Opt_user_xattr:
762 case Opt_nouser_xattr:
763 printk("EXT3 (no)user_xattr options not supported\n");
764 break;
765 #endif
766 #ifdef CONFIG_EXT3_FS_POSIX_ACL
767 case Opt_acl:
768 set_opt(sbi->s_mount_opt, POSIX_ACL);
769 break;
770 case Opt_noacl:
771 clear_opt(sbi->s_mount_opt, POSIX_ACL);
772 break;
773 #else
774 case Opt_acl:
775 case Opt_noacl:
776 printk("EXT3 (no)acl options not supported\n");
777 break;
778 #endif
779 case Opt_reservation:
780 set_opt(sbi->s_mount_opt, RESERVATION);
781 break;
782 case Opt_noreservation:
783 clear_opt(sbi->s_mount_opt, RESERVATION);
784 break;
785 case Opt_journal_update:
786 /* @@@ FIXME */
787 /* Eventually we will want to be able to create
788 a journal file here. For now, only allow the
789 user to specify an existing inode to be the
790 journal file. */
791 if (is_remount) {
792 printk(KERN_ERR "EXT3-fs: cannot specify "
793 "journal on remount\n");
794 return 0;
795 }
796 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
797 break;
798 case Opt_journal_inum:
799 if (is_remount) {
800 printk(KERN_ERR "EXT3-fs: cannot specify "
801 "journal on remount\n");
802 return 0;
803 }
804 if (match_int(&args[0], &option))
805 return 0;
806 *inum = option;
807 break;
808 case Opt_noload:
809 set_opt (sbi->s_mount_opt, NOLOAD);
810 break;
811 case Opt_commit:
812 if (match_int(&args[0], &option))
813 return 0;
814 if (option < 0)
815 return 0;
816 if (option == 0)
817 option = JBD_DEFAULT_MAX_COMMIT_AGE;
818 sbi->s_commit_interval = HZ * option;
819 break;
820 case Opt_data_journal:
821 data_opt = EXT3_MOUNT_JOURNAL_DATA;
822 goto datacheck;
823 case Opt_data_ordered:
824 data_opt = EXT3_MOUNT_ORDERED_DATA;
825 goto datacheck;
826 case Opt_data_writeback:
827 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
828 datacheck:
829 if (is_remount) {
830 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
831 != data_opt) {
832 printk(KERN_ERR
833 "EXT3-fs: cannot change data "
834 "mode on remount\n");
835 return 0;
836 }
837 } else {
838 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
839 sbi->s_mount_opt |= data_opt;
840 }
841 break;
842 #ifdef CONFIG_QUOTA
843 case Opt_usrjquota:
844 qtype = USRQUOTA;
845 goto set_qf_name;
846 case Opt_grpjquota:
847 qtype = GRPQUOTA;
848 set_qf_name:
849 if (sb_any_quota_enabled(sb)) {
850 printk(KERN_ERR
851 "EXT3-fs: Cannot change journalled "
852 "quota options when quota turned on.\n");
853 return 0;
854 }
855 qname = match_strdup(&args[0]);
856 if (!qname) {
857 printk(KERN_ERR
858 "EXT3-fs: not enough memory for "
859 "storing quotafile name.\n");
860 return 0;
861 }
862 if (sbi->s_qf_names[qtype] &&
863 strcmp(sbi->s_qf_names[qtype], qname)) {
864 printk(KERN_ERR
865 "EXT3-fs: %s quota file already "
866 "specified.\n", QTYPE2NAME(qtype));
867 kfree(qname);
868 return 0;
869 }
870 sbi->s_qf_names[qtype] = qname;
871 if (strchr(sbi->s_qf_names[qtype], '/')) {
872 printk(KERN_ERR
873 "EXT3-fs: quotafile must be on "
874 "filesystem root.\n");
875 kfree(sbi->s_qf_names[qtype]);
876 sbi->s_qf_names[qtype] = NULL;
877 return 0;
878 }
879 break;
880 case Opt_offusrjquota:
881 qtype = USRQUOTA;
882 goto clear_qf_name;
883 case Opt_offgrpjquota:
884 qtype = GRPQUOTA;
885 clear_qf_name:
886 if (sb_any_quota_enabled(sb)) {
887 printk(KERN_ERR "EXT3-fs: Cannot change "
888 "journalled quota options when "
889 "quota turned on.\n");
890 return 0;
891 }
892 kfree(sbi->s_qf_names[qtype]);
893 sbi->s_qf_names[qtype] = NULL;
894 break;
895 case Opt_jqfmt_vfsold:
896 sbi->s_jquota_fmt = QFMT_VFS_OLD;
897 break;
898 case Opt_jqfmt_vfsv0:
899 sbi->s_jquota_fmt = QFMT_VFS_V0;
900 break;
901 #else
902 case Opt_usrjquota:
903 case Opt_grpjquota:
904 case Opt_offusrjquota:
905 case Opt_offgrpjquota:
906 case Opt_jqfmt_vfsold:
907 case Opt_jqfmt_vfsv0:
908 printk(KERN_ERR
909 "EXT3-fs: journalled quota options not "
910 "supported.\n");
911 break;
912 #endif
913 case Opt_abort:
914 set_opt(sbi->s_mount_opt, ABORT);
915 break;
916 case Opt_barrier:
917 if (match_int(&args[0], &option))
918 return 0;
919 if (option)
920 set_opt(sbi->s_mount_opt, BARRIER);
921 else
922 clear_opt(sbi->s_mount_opt, BARRIER);
923 break;
924 case Opt_ignore:
925 break;
926 case Opt_resize:
927 if (!n_blocks_count) {
928 printk("EXT3-fs: resize option only available "
929 "for remount\n");
930 return 0;
931 }
932 match_int(&args[0], &option);
933 *n_blocks_count = option;
934 break;
935 case Opt_nobh:
936 set_opt(sbi->s_mount_opt, NOBH);
937 break;
938 default:
939 printk (KERN_ERR
940 "EXT3-fs: Unrecognized mount option \"%s\" "
941 "or missing value\n", p);
942 return 0;
943 }
944 }
945 #ifdef CONFIG_QUOTA
946 if (!sbi->s_jquota_fmt && (sbi->s_qf_names[USRQUOTA] ||
947 sbi->s_qf_names[GRPQUOTA])) {
948 printk(KERN_ERR
949 "EXT3-fs: journalled quota format not specified.\n");
950 return 0;
951 }
952 #endif
953
954 return 1;
955 }
956
957 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
958 int read_only)
959 {
960 struct ext3_sb_info *sbi = EXT3_SB(sb);
961 int res = 0;
962
963 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
964 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
965 "forcing read-only mode\n");
966 res = MS_RDONLY;
967 }
968 if (read_only)
969 return res;
970 if (!(sbi->s_mount_state & EXT3_VALID_FS))
971 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
972 "running e2fsck is recommended\n");
973 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
974 printk (KERN_WARNING
975 "EXT3-fs warning: mounting fs with errors, "
976 "running e2fsck is recommended\n");
977 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
978 le16_to_cpu(es->s_mnt_count) >=
979 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
980 printk (KERN_WARNING
981 "EXT3-fs warning: maximal mount count reached, "
982 "running e2fsck is recommended\n");
983 else if (le32_to_cpu(es->s_checkinterval) &&
984 (le32_to_cpu(es->s_lastcheck) +
985 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
986 printk (KERN_WARNING
987 "EXT3-fs warning: checktime reached, "
988 "running e2fsck is recommended\n");
989 #if 0
990 /* @@@ We _will_ want to clear the valid bit if we find
991 inconsistencies, to force a fsck at reboot. But for
992 a plain journaled filesystem we can keep it set as
993 valid forever! :) */
994 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
995 #endif
996 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
997 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
998 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
999 es->s_mtime = cpu_to_le32(get_seconds());
1000 ext3_update_dynamic_rev(sb);
1001 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1002
1003 ext3_commit_super(sb, es, 1);
1004 if (test_opt(sb, DEBUG))
1005 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1006 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1007 sb->s_blocksize,
1008 sbi->s_groups_count,
1009 EXT3_BLOCKS_PER_GROUP(sb),
1010 EXT3_INODES_PER_GROUP(sb),
1011 sbi->s_mount_opt);
1012
1013 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1014 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1015 char b[BDEVNAME_SIZE];
1016
1017 printk("external journal on %s\n",
1018 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1019 } else {
1020 printk("internal journal\n");
1021 }
1022 #ifdef CONFIG_EXT3_CHECK
1023 if (test_opt (sb, CHECK)) {
1024 ext3_check_blocks_bitmap (sb);
1025 ext3_check_inodes_bitmap (sb);
1026 }
1027 #endif
1028 return res;
1029 }
1030
1031 /* Called at mount-time, super-block is locked */
1032 static int ext3_check_descriptors (struct super_block * sb)
1033 {
1034 struct ext3_sb_info *sbi = EXT3_SB(sb);
1035 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1036 struct ext3_group_desc * gdp = NULL;
1037 int desc_block = 0;
1038 int i;
1039
1040 ext3_debug ("Checking group descriptors");
1041
1042 for (i = 0; i < sbi->s_groups_count; i++)
1043 {
1044 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1045 gdp = (struct ext3_group_desc *)
1046 sbi->s_group_desc[desc_block++]->b_data;
1047 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1048 le32_to_cpu(gdp->bg_block_bitmap) >=
1049 block + EXT3_BLOCKS_PER_GROUP(sb))
1050 {
1051 ext3_error (sb, "ext3_check_descriptors",
1052 "Block bitmap for group %d"
1053 " not in group (block %lu)!",
1054 i, (unsigned long)
1055 le32_to_cpu(gdp->bg_block_bitmap));
1056 return 0;
1057 }
1058 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1059 le32_to_cpu(gdp->bg_inode_bitmap) >=
1060 block + EXT3_BLOCKS_PER_GROUP(sb))
1061 {
1062 ext3_error (sb, "ext3_check_descriptors",
1063 "Inode bitmap for group %d"
1064 " not in group (block %lu)!",
1065 i, (unsigned long)
1066 le32_to_cpu(gdp->bg_inode_bitmap));
1067 return 0;
1068 }
1069 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1070 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1071 block + EXT3_BLOCKS_PER_GROUP(sb))
1072 {
1073 ext3_error (sb, "ext3_check_descriptors",
1074 "Inode table for group %d"
1075 " not in group (block %lu)!",
1076 i, (unsigned long)
1077 le32_to_cpu(gdp->bg_inode_table));
1078 return 0;
1079 }
1080 block += EXT3_BLOCKS_PER_GROUP(sb);
1081 gdp++;
1082 }
1083
1084 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1085 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1086 return 1;
1087 }
1088
1089
1090 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1091 * the superblock) which were deleted from all directories, but held open by
1092 * a process at the time of a crash. We walk the list and try to delete these
1093 * inodes at recovery time (only with a read-write filesystem).
1094 *
1095 * In order to keep the orphan inode chain consistent during traversal (in
1096 * case of crash during recovery), we link each inode into the superblock
1097 * orphan list_head and handle it the same way as an inode deletion during
1098 * normal operation (which journals the operations for us).
1099 *
1100 * We only do an iget() and an iput() on each inode, which is very safe if we
1101 * accidentally point at an in-use or already deleted inode. The worst that
1102 * can happen in this case is that we get a "bit already cleared" message from
1103 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1104 * e2fsck was run on this filesystem, and it must have already done the orphan
1105 * inode cleanup for us, so we can safely abort without any further action.
1106 */
1107 static void ext3_orphan_cleanup (struct super_block * sb,
1108 struct ext3_super_block * es)
1109 {
1110 unsigned int s_flags = sb->s_flags;
1111 int nr_orphans = 0, nr_truncates = 0;
1112 #ifdef CONFIG_QUOTA
1113 int i;
1114 #endif
1115 if (!es->s_last_orphan) {
1116 jbd_debug(4, "no orphan inodes to clean up\n");
1117 return;
1118 }
1119
1120 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1121 if (es->s_last_orphan)
1122 jbd_debug(1, "Errors on filesystem, "
1123 "clearing orphan list.\n");
1124 es->s_last_orphan = 0;
1125 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1126 return;
1127 }
1128
1129 if (s_flags & MS_RDONLY) {
1130 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1131 sb->s_id);
1132 sb->s_flags &= ~MS_RDONLY;
1133 }
1134 #ifdef CONFIG_QUOTA
1135 /* Needed for iput() to work correctly and not trash data */
1136 sb->s_flags |= MS_ACTIVE;
1137 /* Turn on quotas so that they are updated correctly */
1138 for (i = 0; i < MAXQUOTAS; i++) {
1139 if (EXT3_SB(sb)->s_qf_names[i]) {
1140 int ret = ext3_quota_on_mount(sb, i);
1141 if (ret < 0)
1142 printk(KERN_ERR
1143 "EXT3-fs: Cannot turn on journalled "
1144 "quota: error %d\n", ret);
1145 }
1146 }
1147 #endif
1148
1149 while (es->s_last_orphan) {
1150 struct inode *inode;
1151
1152 if (!(inode =
1153 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1154 es->s_last_orphan = 0;
1155 break;
1156 }
1157
1158 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1159 DQUOT_INIT(inode);
1160 if (inode->i_nlink) {
1161 printk(KERN_DEBUG
1162 "%s: truncating inode %ld to %Ld bytes\n",
1163 __FUNCTION__, inode->i_ino, inode->i_size);
1164 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1165 inode->i_ino, inode->i_size);
1166 ext3_truncate(inode);
1167 nr_truncates++;
1168 } else {
1169 printk(KERN_DEBUG
1170 "%s: deleting unreferenced inode %ld\n",
1171 __FUNCTION__, inode->i_ino);
1172 jbd_debug(2, "deleting unreferenced inode %ld\n",
1173 inode->i_ino);
1174 nr_orphans++;
1175 }
1176 iput(inode); /* The delete magic happens here! */
1177 }
1178
1179 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1180
1181 if (nr_orphans)
1182 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1183 sb->s_id, PLURAL(nr_orphans));
1184 if (nr_truncates)
1185 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1186 sb->s_id, PLURAL(nr_truncates));
1187 #ifdef CONFIG_QUOTA
1188 /* Turn quotas off */
1189 for (i = 0; i < MAXQUOTAS; i++) {
1190 if (sb_dqopt(sb)->files[i])
1191 vfs_quota_off(sb, i);
1192 }
1193 #endif
1194 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1195 }
1196
1197 #define log2(n) ffz(~(n))
1198
1199 /*
1200 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1201 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1202 * We need to be 1 filesystem block less than the 2^32 sector limit.
1203 */
1204 static loff_t ext3_max_size(int bits)
1205 {
1206 loff_t res = EXT3_NDIR_BLOCKS;
1207 /* This constant is calculated to be the largest file size for a
1208 * dense, 4k-blocksize file such that the total number of
1209 * sectors in the file, including data and all indirect blocks,
1210 * does not exceed 2^32. */
1211 const loff_t upper_limit = 0x1ff7fffd000LL;
1212
1213 res += 1LL << (bits-2);
1214 res += 1LL << (2*(bits-2));
1215 res += 1LL << (3*(bits-2));
1216 res <<= bits;
1217 if (res > upper_limit)
1218 res = upper_limit;
1219 return res;
1220 }
1221
1222 static unsigned long descriptor_loc(struct super_block *sb,
1223 unsigned long logic_sb_block,
1224 int nr)
1225 {
1226 struct ext3_sb_info *sbi = EXT3_SB(sb);
1227 unsigned long bg, first_data_block, first_meta_bg;
1228 int has_super = 0;
1229
1230 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1231 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1232
1233 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1234 nr < first_meta_bg)
1235 return (logic_sb_block + nr + 1);
1236 bg = sbi->s_desc_per_block * nr;
1237 if (ext3_bg_has_super(sb, bg))
1238 has_super = 1;
1239 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1240 }
1241
1242
1243 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1244 {
1245 struct buffer_head * bh;
1246 struct ext3_super_block *es = NULL;
1247 struct ext3_sb_info *sbi;
1248 unsigned long block;
1249 unsigned long sb_block = get_sb_block(&data);
1250 unsigned long logic_sb_block;
1251 unsigned long offset = 0;
1252 unsigned long journal_inum = 0;
1253 unsigned long def_mount_opts;
1254 struct inode *root;
1255 int blocksize;
1256 int hblock;
1257 int db_count;
1258 int i;
1259 int needs_recovery;
1260 __le32 features;
1261
1262 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1263 if (!sbi)
1264 return -ENOMEM;
1265 sb->s_fs_info = sbi;
1266 memset(sbi, 0, sizeof(*sbi));
1267 sbi->s_mount_opt = 0;
1268 sbi->s_resuid = EXT3_DEF_RESUID;
1269 sbi->s_resgid = EXT3_DEF_RESGID;
1270
1271 unlock_kernel();
1272
1273 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1274 if (!blocksize) {
1275 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1276 goto out_fail;
1277 }
1278
1279 /*
1280 * The ext3 superblock will not be buffer aligned for other than 1kB
1281 * block sizes. We need to calculate the offset from buffer start.
1282 */
1283 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1284 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1285 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1286 } else {
1287 logic_sb_block = sb_block;
1288 }
1289
1290 if (!(bh = sb_bread(sb, logic_sb_block))) {
1291 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1292 goto out_fail;
1293 }
1294 /*
1295 * Note: s_es must be initialized as soon as possible because
1296 * some ext3 macro-instructions depend on its value
1297 */
1298 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1299 sbi->s_es = es;
1300 sb->s_magic = le16_to_cpu(es->s_magic);
1301 if (sb->s_magic != EXT3_SUPER_MAGIC)
1302 goto cantfind_ext3;
1303
1304 /* Set defaults before we parse the mount options */
1305 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1306 if (def_mount_opts & EXT3_DEFM_DEBUG)
1307 set_opt(sbi->s_mount_opt, DEBUG);
1308 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1309 set_opt(sbi->s_mount_opt, GRPID);
1310 if (def_mount_opts & EXT3_DEFM_UID16)
1311 set_opt(sbi->s_mount_opt, NO_UID32);
1312 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1313 set_opt(sbi->s_mount_opt, XATTR_USER);
1314 if (def_mount_opts & EXT3_DEFM_ACL)
1315 set_opt(sbi->s_mount_opt, POSIX_ACL);
1316 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1317 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1318 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1319 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1320 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1321 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1322
1323 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1324 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1325 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1326 set_opt(sbi->s_mount_opt, ERRORS_RO);
1327
1328 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1329 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1330
1331 set_opt(sbi->s_mount_opt, RESERVATION);
1332
1333 if (!parse_options ((char *) data, sb, &journal_inum, NULL, 0))
1334 goto failed_mount;
1335
1336 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1337 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1338
1339 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1340 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1341 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1342 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1343 printk(KERN_WARNING
1344 "EXT3-fs warning: feature flags set on rev 0 fs, "
1345 "running e2fsck is recommended\n");
1346 /*
1347 * Check feature flags regardless of the revision level, since we
1348 * previously didn't change the revision level when setting the flags,
1349 * so there is a chance incompat flags are set on a rev 0 filesystem.
1350 */
1351 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1352 if (features) {
1353 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1354 "unsupported optional features (%x).\n",
1355 sb->s_id, le32_to_cpu(features));
1356 goto failed_mount;
1357 }
1358 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1359 if (!(sb->s_flags & MS_RDONLY) && features) {
1360 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1361 "unsupported optional features (%x).\n",
1362 sb->s_id, le32_to_cpu(features));
1363 goto failed_mount;
1364 }
1365 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1366
1367 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1368 blocksize > EXT3_MAX_BLOCK_SIZE) {
1369 printk(KERN_ERR
1370 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1371 blocksize, sb->s_id);
1372 goto failed_mount;
1373 }
1374
1375 hblock = bdev_hardsect_size(sb->s_bdev);
1376 if (sb->s_blocksize != blocksize) {
1377 /*
1378 * Make sure the blocksize for the filesystem is larger
1379 * than the hardware sectorsize for the machine.
1380 */
1381 if (blocksize < hblock) {
1382 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1383 "device blocksize %d.\n", blocksize, hblock);
1384 goto failed_mount;
1385 }
1386
1387 brelse (bh);
1388 sb_set_blocksize(sb, blocksize);
1389 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1390 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1391 bh = sb_bread(sb, logic_sb_block);
1392 if (!bh) {
1393 printk(KERN_ERR
1394 "EXT3-fs: Can't read superblock on 2nd try.\n");
1395 goto failed_mount;
1396 }
1397 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1398 sbi->s_es = es;
1399 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1400 printk (KERN_ERR
1401 "EXT3-fs: Magic mismatch, very weird !\n");
1402 goto failed_mount;
1403 }
1404 }
1405
1406 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1407
1408 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1409 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1410 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1411 } else {
1412 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1413 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1414 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1415 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1416 (sbi->s_inode_size > blocksize)) {
1417 printk (KERN_ERR
1418 "EXT3-fs: unsupported inode size: %d\n",
1419 sbi->s_inode_size);
1420 goto failed_mount;
1421 }
1422 }
1423 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1424 le32_to_cpu(es->s_log_frag_size);
1425 if (blocksize != sbi->s_frag_size) {
1426 printk(KERN_ERR
1427 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1428 sbi->s_frag_size, blocksize);
1429 goto failed_mount;
1430 }
1431 sbi->s_frags_per_block = 1;
1432 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1433 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1434 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1435 if (EXT3_INODE_SIZE(sb) == 0)
1436 goto cantfind_ext3;
1437 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1438 if (sbi->s_inodes_per_block == 0)
1439 goto cantfind_ext3;
1440 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1441 sbi->s_inodes_per_block;
1442 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1443 sbi->s_sbh = bh;
1444 sbi->s_mount_state = le16_to_cpu(es->s_state);
1445 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1446 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1447 for (i=0; i < 4; i++)
1448 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1449 sbi->s_def_hash_version = es->s_def_hash_version;
1450
1451 if (sbi->s_blocks_per_group > blocksize * 8) {
1452 printk (KERN_ERR
1453 "EXT3-fs: #blocks per group too big: %lu\n",
1454 sbi->s_blocks_per_group);
1455 goto failed_mount;
1456 }
1457 if (sbi->s_frags_per_group > blocksize * 8) {
1458 printk (KERN_ERR
1459 "EXT3-fs: #fragments per group too big: %lu\n",
1460 sbi->s_frags_per_group);
1461 goto failed_mount;
1462 }
1463 if (sbi->s_inodes_per_group > blocksize * 8) {
1464 printk (KERN_ERR
1465 "EXT3-fs: #inodes per group too big: %lu\n",
1466 sbi->s_inodes_per_group);
1467 goto failed_mount;
1468 }
1469
1470 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1471 goto cantfind_ext3;
1472 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1473 le32_to_cpu(es->s_first_data_block) +
1474 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1475 EXT3_BLOCKS_PER_GROUP(sb);
1476 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1477 EXT3_DESC_PER_BLOCK(sb);
1478 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1479 GFP_KERNEL);
1480 if (sbi->s_group_desc == NULL) {
1481 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1482 goto failed_mount;
1483 }
1484
1485 percpu_counter_init(&sbi->s_freeblocks_counter);
1486 percpu_counter_init(&sbi->s_freeinodes_counter);
1487 percpu_counter_init(&sbi->s_dirs_counter);
1488 bgl_lock_init(&sbi->s_blockgroup_lock);
1489
1490 for (i = 0; i < db_count; i++) {
1491 block = descriptor_loc(sb, logic_sb_block, i);
1492 sbi->s_group_desc[i] = sb_bread(sb, block);
1493 if (!sbi->s_group_desc[i]) {
1494 printk (KERN_ERR "EXT3-fs: "
1495 "can't read group descriptor %d\n", i);
1496 db_count = i;
1497 goto failed_mount2;
1498 }
1499 }
1500 if (!ext3_check_descriptors (sb)) {
1501 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1502 goto failed_mount2;
1503 }
1504 sbi->s_gdb_count = db_count;
1505 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1506 spin_lock_init(&sbi->s_next_gen_lock);
1507 /* per fileystem reservation list head & lock */
1508 spin_lock_init(&sbi->s_rsv_window_lock);
1509 sbi->s_rsv_window_root = RB_ROOT;
1510 /* Add a single, static dummy reservation to the start of the
1511 * reservation window list --- it gives us a placeholder for
1512 * append-at-start-of-list which makes the allocation logic
1513 * _much_ simpler. */
1514 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1515 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1516 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1517 sbi->s_rsv_window_head.rsv_goal_size = 0;
1518 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1519
1520 /*
1521 * set up enough so that it can read an inode
1522 */
1523 sb->s_op = &ext3_sops;
1524 sb->s_export_op = &ext3_export_ops;
1525 sb->s_xattr = ext3_xattr_handlers;
1526 #ifdef CONFIG_QUOTA
1527 sb->s_qcop = &ext3_qctl_operations;
1528 sb->dq_op = &ext3_quota_operations;
1529 #endif
1530 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1531
1532 sb->s_root = NULL;
1533
1534 needs_recovery = (es->s_last_orphan != 0 ||
1535 EXT3_HAS_INCOMPAT_FEATURE(sb,
1536 EXT3_FEATURE_INCOMPAT_RECOVER));
1537
1538 /*
1539 * The first inode we look at is the journal inode. Don't try
1540 * root first: it may be modified in the journal!
1541 */
1542 if (!test_opt(sb, NOLOAD) &&
1543 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1544 if (ext3_load_journal(sb, es))
1545 goto failed_mount2;
1546 } else if (journal_inum) {
1547 if (ext3_create_journal(sb, es, journal_inum))
1548 goto failed_mount2;
1549 } else {
1550 if (!silent)
1551 printk (KERN_ERR
1552 "ext3: No journal on filesystem on %s\n",
1553 sb->s_id);
1554 goto failed_mount2;
1555 }
1556
1557 /* We have now updated the journal if required, so we can
1558 * validate the data journaling mode. */
1559 switch (test_opt(sb, DATA_FLAGS)) {
1560 case 0:
1561 /* No mode set, assume a default based on the journal
1562 capabilities: ORDERED_DATA if the journal can
1563 cope, else JOURNAL_DATA */
1564 if (journal_check_available_features
1565 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1566 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1567 else
1568 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1569 break;
1570
1571 case EXT3_MOUNT_ORDERED_DATA:
1572 case EXT3_MOUNT_WRITEBACK_DATA:
1573 if (!journal_check_available_features
1574 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1575 printk(KERN_ERR "EXT3-fs: Journal does not support "
1576 "requested data journaling mode\n");
1577 goto failed_mount3;
1578 }
1579 default:
1580 break;
1581 }
1582
1583 if (test_opt(sb, NOBH)) {
1584 if (sb->s_blocksize_bits != PAGE_CACHE_SHIFT) {
1585 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option "
1586 "since filesystem blocksize doesn't match "
1587 "pagesize\n");
1588 clear_opt(sbi->s_mount_opt, NOBH);
1589 }
1590 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1591 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1592 "its supported only with writeback mode\n");
1593 clear_opt(sbi->s_mount_opt, NOBH);
1594 }
1595 }
1596 /*
1597 * The journal_load will have done any necessary log recovery,
1598 * so we can safely mount the rest of the filesystem now.
1599 */
1600
1601 root = iget(sb, EXT3_ROOT_INO);
1602 sb->s_root = d_alloc_root(root);
1603 if (!sb->s_root) {
1604 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1605 iput(root);
1606 goto failed_mount3;
1607 }
1608 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1609 dput(sb->s_root);
1610 sb->s_root = NULL;
1611 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1612 goto failed_mount3;
1613 }
1614
1615 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1616 /*
1617 * akpm: core read_super() calls in here with the superblock locked.
1618 * That deadlocks, because orphan cleanup needs to lock the superblock
1619 * in numerous places. Here we just pop the lock - it's relatively
1620 * harmless, because we are now ready to accept write_super() requests,
1621 * and aviro says that's the only reason for hanging onto the
1622 * superblock lock.
1623 */
1624 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1625 ext3_orphan_cleanup(sb, es);
1626 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1627 if (needs_recovery)
1628 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1629 ext3_mark_recovery_complete(sb, es);
1630 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1631 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1632 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1633 "writeback");
1634
1635 percpu_counter_mod(&sbi->s_freeblocks_counter,
1636 ext3_count_free_blocks(sb));
1637 percpu_counter_mod(&sbi->s_freeinodes_counter,
1638 ext3_count_free_inodes(sb));
1639 percpu_counter_mod(&sbi->s_dirs_counter,
1640 ext3_count_dirs(sb));
1641
1642 lock_kernel();
1643 return 0;
1644
1645 cantfind_ext3:
1646 if (!silent)
1647 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1648 sb->s_id);
1649 goto failed_mount;
1650
1651 failed_mount3:
1652 journal_destroy(sbi->s_journal);
1653 failed_mount2:
1654 for (i = 0; i < db_count; i++)
1655 brelse(sbi->s_group_desc[i]);
1656 kfree(sbi->s_group_desc);
1657 failed_mount:
1658 #ifdef CONFIG_QUOTA
1659 for (i = 0; i < MAXQUOTAS; i++)
1660 kfree(sbi->s_qf_names[i]);
1661 #endif
1662 ext3_blkdev_remove(sbi);
1663 brelse(bh);
1664 out_fail:
1665 sb->s_fs_info = NULL;
1666 kfree(sbi);
1667 lock_kernel();
1668 return -EINVAL;
1669 }
1670
1671 /*
1672 * Setup any per-fs journal parameters now. We'll do this both on
1673 * initial mount, once the journal has been initialised but before we've
1674 * done any recovery; and again on any subsequent remount.
1675 */
1676 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1677 {
1678 struct ext3_sb_info *sbi = EXT3_SB(sb);
1679
1680 if (sbi->s_commit_interval)
1681 journal->j_commit_interval = sbi->s_commit_interval;
1682 /* We could also set up an ext3-specific default for the commit
1683 * interval here, but for now we'll just fall back to the jbd
1684 * default. */
1685
1686 spin_lock(&journal->j_state_lock);
1687 if (test_opt(sb, BARRIER))
1688 journal->j_flags |= JFS_BARRIER;
1689 else
1690 journal->j_flags &= ~JFS_BARRIER;
1691 spin_unlock(&journal->j_state_lock);
1692 }
1693
1694 static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1695 {
1696 struct inode *journal_inode;
1697 journal_t *journal;
1698
1699 /* First, test for the existence of a valid inode on disk. Bad
1700 * things happen if we iget() an unused inode, as the subsequent
1701 * iput() will try to delete it. */
1702
1703 journal_inode = iget(sb, journal_inum);
1704 if (!journal_inode) {
1705 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1706 return NULL;
1707 }
1708 if (!journal_inode->i_nlink) {
1709 make_bad_inode(journal_inode);
1710 iput(journal_inode);
1711 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1712 return NULL;
1713 }
1714
1715 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1716 journal_inode, journal_inode->i_size);
1717 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1718 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1719 iput(journal_inode);
1720 return NULL;
1721 }
1722
1723 journal = journal_init_inode(journal_inode);
1724 if (!journal) {
1725 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1726 iput(journal_inode);
1727 return NULL;
1728 }
1729 journal->j_private = sb;
1730 ext3_init_journal_params(sb, journal);
1731 return journal;
1732 }
1733
1734 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1735 dev_t j_dev)
1736 {
1737 struct buffer_head * bh;
1738 journal_t *journal;
1739 int start;
1740 int len;
1741 int hblock, blocksize;
1742 unsigned long sb_block;
1743 unsigned long offset;
1744 struct ext3_super_block * es;
1745 struct block_device *bdev;
1746
1747 bdev = ext3_blkdev_get(j_dev);
1748 if (bdev == NULL)
1749 return NULL;
1750
1751 if (bd_claim(bdev, sb)) {
1752 printk(KERN_ERR
1753 "EXT3: failed to claim external journal device.\n");
1754 blkdev_put(bdev);
1755 return NULL;
1756 }
1757
1758 blocksize = sb->s_blocksize;
1759 hblock = bdev_hardsect_size(bdev);
1760 if (blocksize < hblock) {
1761 printk(KERN_ERR
1762 "EXT3-fs: blocksize too small for journal device.\n");
1763 goto out_bdev;
1764 }
1765
1766 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1767 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1768 set_blocksize(bdev, blocksize);
1769 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1770 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1771 "external journal\n");
1772 goto out_bdev;
1773 }
1774
1775 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1776 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1777 !(le32_to_cpu(es->s_feature_incompat) &
1778 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1779 printk(KERN_ERR "EXT3-fs: external journal has "
1780 "bad superblock\n");
1781 brelse(bh);
1782 goto out_bdev;
1783 }
1784
1785 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1786 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1787 brelse(bh);
1788 goto out_bdev;
1789 }
1790
1791 len = le32_to_cpu(es->s_blocks_count);
1792 start = sb_block + 1;
1793 brelse(bh); /* we're done with the superblock */
1794
1795 journal = journal_init_dev(bdev, sb->s_bdev,
1796 start, len, blocksize);
1797 if (!journal) {
1798 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1799 goto out_bdev;
1800 }
1801 journal->j_private = sb;
1802 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1803 wait_on_buffer(journal->j_sb_buffer);
1804 if (!buffer_uptodate(journal->j_sb_buffer)) {
1805 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1806 goto out_journal;
1807 }
1808 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1809 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1810 "user (unsupported) - %d\n",
1811 be32_to_cpu(journal->j_superblock->s_nr_users));
1812 goto out_journal;
1813 }
1814 EXT3_SB(sb)->journal_bdev = bdev;
1815 ext3_init_journal_params(sb, journal);
1816 return journal;
1817 out_journal:
1818 journal_destroy(journal);
1819 out_bdev:
1820 ext3_blkdev_put(bdev);
1821 return NULL;
1822 }
1823
1824 static int ext3_load_journal(struct super_block * sb,
1825 struct ext3_super_block * es)
1826 {
1827 journal_t *journal;
1828 int journal_inum = le32_to_cpu(es->s_journal_inum);
1829 dev_t journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1830 int err = 0;
1831 int really_read_only;
1832
1833 really_read_only = bdev_read_only(sb->s_bdev);
1834
1835 /*
1836 * Are we loading a blank journal or performing recovery after a
1837 * crash? For recovery, we need to check in advance whether we
1838 * can get read-write access to the device.
1839 */
1840
1841 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1842 if (sb->s_flags & MS_RDONLY) {
1843 printk(KERN_INFO "EXT3-fs: INFO: recovery "
1844 "required on readonly filesystem.\n");
1845 if (really_read_only) {
1846 printk(KERN_ERR "EXT3-fs: write access "
1847 "unavailable, cannot proceed.\n");
1848 return -EROFS;
1849 }
1850 printk (KERN_INFO "EXT3-fs: write access will "
1851 "be enabled during recovery.\n");
1852 }
1853 }
1854
1855 if (journal_inum && journal_dev) {
1856 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1857 "and inode journals!\n");
1858 return -EINVAL;
1859 }
1860
1861 if (journal_inum) {
1862 if (!(journal = ext3_get_journal(sb, journal_inum)))
1863 return -EINVAL;
1864 } else {
1865 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1866 return -EINVAL;
1867 }
1868
1869 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1870 err = journal_update_format(journal);
1871 if (err) {
1872 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1873 journal_destroy(journal);
1874 return err;
1875 }
1876 }
1877
1878 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1879 err = journal_wipe(journal, !really_read_only);
1880 if (!err)
1881 err = journal_load(journal);
1882
1883 if (err) {
1884 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
1885 journal_destroy(journal);
1886 return err;
1887 }
1888
1889 EXT3_SB(sb)->s_journal = journal;
1890 ext3_clear_journal_err(sb, es);
1891 return 0;
1892 }
1893
1894 static int ext3_create_journal(struct super_block * sb,
1895 struct ext3_super_block * es,
1896 int journal_inum)
1897 {
1898 journal_t *journal;
1899
1900 if (sb->s_flags & MS_RDONLY) {
1901 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
1902 "create journal.\n");
1903 return -EROFS;
1904 }
1905
1906 if (!(journal = ext3_get_journal(sb, journal_inum)))
1907 return -EINVAL;
1908
1909 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
1910 journal_inum);
1911
1912 if (journal_create(journal)) {
1913 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
1914 journal_destroy(journal);
1915 return -EIO;
1916 }
1917
1918 EXT3_SB(sb)->s_journal = journal;
1919
1920 ext3_update_dynamic_rev(sb);
1921 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1922 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
1923
1924 es->s_journal_inum = cpu_to_le32(journal_inum);
1925 sb->s_dirt = 1;
1926
1927 /* Make sure we flush the recovery flag to disk. */
1928 ext3_commit_super(sb, es, 1);
1929
1930 return 0;
1931 }
1932
1933 static void ext3_commit_super (struct super_block * sb,
1934 struct ext3_super_block * es,
1935 int sync)
1936 {
1937 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
1938
1939 if (!sbh)
1940 return;
1941 es->s_wtime = cpu_to_le32(get_seconds());
1942 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
1943 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
1944 BUFFER_TRACE(sbh, "marking dirty");
1945 mark_buffer_dirty(sbh);
1946 if (sync)
1947 sync_dirty_buffer(sbh);
1948 }
1949
1950
1951 /*
1952 * Have we just finished recovery? If so, and if we are mounting (or
1953 * remounting) the filesystem readonly, then we will end up with a
1954 * consistent fs on disk. Record that fact.
1955 */
1956 static void ext3_mark_recovery_complete(struct super_block * sb,
1957 struct ext3_super_block * es)
1958 {
1959 journal_t *journal = EXT3_SB(sb)->s_journal;
1960
1961 journal_lock_updates(journal);
1962 journal_flush(journal);
1963 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
1964 sb->s_flags & MS_RDONLY) {
1965 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1966 sb->s_dirt = 0;
1967 ext3_commit_super(sb, es, 1);
1968 }
1969 journal_unlock_updates(journal);
1970 }
1971
1972 /*
1973 * If we are mounting (or read-write remounting) a filesystem whose journal
1974 * has recorded an error from a previous lifetime, move that error to the
1975 * main filesystem now.
1976 */
1977 static void ext3_clear_journal_err(struct super_block * sb,
1978 struct ext3_super_block * es)
1979 {
1980 journal_t *journal;
1981 int j_errno;
1982 const char *errstr;
1983
1984 journal = EXT3_SB(sb)->s_journal;
1985
1986 /*
1987 * Now check for any error status which may have been recorded in the
1988 * journal by a prior ext3_error() or ext3_abort()
1989 */
1990
1991 j_errno = journal_errno(journal);
1992 if (j_errno) {
1993 char nbuf[16];
1994
1995 errstr = ext3_decode_error(sb, j_errno, nbuf);
1996 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
1997 "from previous mount: %s", errstr);
1998 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
1999 "filesystem check.");
2000
2001 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2002 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2003 ext3_commit_super (sb, es, 1);
2004
2005 journal_clear_err(journal);
2006 }
2007 }
2008
2009 /*
2010 * Force the running and committing transactions to commit,
2011 * and wait on the commit.
2012 */
2013 int ext3_force_commit(struct super_block *sb)
2014 {
2015 journal_t *journal;
2016 int ret;
2017
2018 if (sb->s_flags & MS_RDONLY)
2019 return 0;
2020
2021 journal = EXT3_SB(sb)->s_journal;
2022 sb->s_dirt = 0;
2023 ret = ext3_journal_force_commit(journal);
2024 return ret;
2025 }
2026
2027 /*
2028 * Ext3 always journals updates to the superblock itself, so we don't
2029 * have to propagate any other updates to the superblock on disk at this
2030 * point. Just start an async writeback to get the buffers on their way
2031 * to the disk.
2032 *
2033 * This implicitly triggers the writebehind on sync().
2034 */
2035
2036 static void ext3_write_super (struct super_block * sb)
2037 {
2038 if (down_trylock(&sb->s_lock) == 0)
2039 BUG();
2040 sb->s_dirt = 0;
2041 }
2042
2043 static int ext3_sync_fs(struct super_block *sb, int wait)
2044 {
2045 tid_t target;
2046
2047 sb->s_dirt = 0;
2048 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2049 if (wait)
2050 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2051 }
2052 return 0;
2053 }
2054
2055 /*
2056 * LVM calls this function before a (read-only) snapshot is created. This
2057 * gives us a chance to flush the journal completely and mark the fs clean.
2058 */
2059 static void ext3_write_super_lockfs(struct super_block *sb)
2060 {
2061 sb->s_dirt = 0;
2062
2063 if (!(sb->s_flags & MS_RDONLY)) {
2064 journal_t *journal = EXT3_SB(sb)->s_journal;
2065
2066 /* Now we set up the journal barrier. */
2067 journal_lock_updates(journal);
2068 journal_flush(journal);
2069
2070 /* Journal blocked and flushed, clear needs_recovery flag. */
2071 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2072 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2073 }
2074 }
2075
2076 /*
2077 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2078 * flag here, even though the filesystem is not technically dirty yet.
2079 */
2080 static void ext3_unlockfs(struct super_block *sb)
2081 {
2082 if (!(sb->s_flags & MS_RDONLY)) {
2083 lock_super(sb);
2084 /* Reser the needs_recovery flag before the fs is unlocked. */
2085 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2086 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2087 unlock_super(sb);
2088 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2089 }
2090 }
2091
2092 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2093 {
2094 struct ext3_super_block * es;
2095 struct ext3_sb_info *sbi = EXT3_SB(sb);
2096 unsigned long tmp;
2097 unsigned long n_blocks_count = 0;
2098
2099 /*
2100 * Allow the "check" option to be passed as a remount option.
2101 */
2102 if (!parse_options(data, sb, &tmp, &n_blocks_count, 1))
2103 return -EINVAL;
2104
2105 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2106 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2107
2108 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2109 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2110
2111 es = sbi->s_es;
2112
2113 ext3_init_journal_params(sb, sbi->s_journal);
2114
2115 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2116 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2117 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2118 return -EROFS;
2119
2120 if (*flags & MS_RDONLY) {
2121 /*
2122 * First of all, the unconditional stuff we have to do
2123 * to disable replay of the journal when we next remount
2124 */
2125 sb->s_flags |= MS_RDONLY;
2126
2127 /*
2128 * OK, test if we are remounting a valid rw partition
2129 * readonly, and if so set the rdonly flag and then
2130 * mark the partition as valid again.
2131 */
2132 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2133 (sbi->s_mount_state & EXT3_VALID_FS))
2134 es->s_state = cpu_to_le16(sbi->s_mount_state);
2135
2136 ext3_mark_recovery_complete(sb, es);
2137 } else {
2138 __le32 ret;
2139 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2140 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2141 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2142 "remount RDWR because of unsupported "
2143 "optional features (%x).\n",
2144 sb->s_id, le32_to_cpu(ret));
2145 return -EROFS;
2146 }
2147 /*
2148 * Mounting a RDONLY partition read-write, so reread
2149 * and store the current valid flag. (It may have
2150 * been changed by e2fsck since we originally mounted
2151 * the partition.)
2152 */
2153 ext3_clear_journal_err(sb, es);
2154 sbi->s_mount_state = le16_to_cpu(es->s_state);
2155 if ((ret = ext3_group_extend(sb, es, n_blocks_count)))
2156 return ret;
2157 if (!ext3_setup_super (sb, es, 0))
2158 sb->s_flags &= ~MS_RDONLY;
2159 }
2160 }
2161 return 0;
2162 }
2163
2164 static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
2165 {
2166 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
2167 unsigned long overhead;
2168 int i;
2169
2170 if (test_opt (sb, MINIX_DF))
2171 overhead = 0;
2172 else {
2173 unsigned long ngroups;
2174 ngroups = EXT3_SB(sb)->s_groups_count;
2175 smp_rmb();
2176
2177 /*
2178 * Compute the overhead (FS structures)
2179 */
2180
2181 /*
2182 * All of the blocks before first_data_block are
2183 * overhead
2184 */
2185 overhead = le32_to_cpu(es->s_first_data_block);
2186
2187 /*
2188 * Add the overhead attributed to the superblock and
2189 * block group descriptors. If the sparse superblocks
2190 * feature is turned on, then not all groups have this.
2191 */
2192 for (i = 0; i < ngroups; i++) {
2193 overhead += ext3_bg_has_super(sb, i) +
2194 ext3_bg_num_gdb(sb, i);
2195 cond_resched();
2196 }
2197
2198 /*
2199 * Every block group has an inode bitmap, a block
2200 * bitmap, and an inode table.
2201 */
2202 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2203 }
2204
2205 buf->f_type = EXT3_SUPER_MAGIC;
2206 buf->f_bsize = sb->s_blocksize;
2207 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2208 buf->f_bfree = ext3_count_free_blocks (sb);
2209 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2210 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2211 buf->f_bavail = 0;
2212 buf->f_files = le32_to_cpu(es->s_inodes_count);
2213 buf->f_ffree = ext3_count_free_inodes (sb);
2214 buf->f_namelen = EXT3_NAME_LEN;
2215 return 0;
2216 }
2217
2218 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2219 * is locked for write. Otherwise the are possible deadlocks:
2220 * Process 1 Process 2
2221 * ext3_create() quota_sync()
2222 * journal_start() write_dquot()
2223 * DQUOT_INIT() down(dqio_sem)
2224 * down(dqio_sem) journal_start()
2225 *
2226 */
2227
2228 #ifdef CONFIG_QUOTA
2229
2230 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2231 {
2232 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2233 }
2234
2235 static int ext3_dquot_initialize(struct inode *inode, int type)
2236 {
2237 handle_t *handle;
2238 int ret, err;
2239
2240 /* We may create quota structure so we need to reserve enough blocks */
2241 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS);
2242 if (IS_ERR(handle))
2243 return PTR_ERR(handle);
2244 ret = dquot_initialize(inode, type);
2245 err = ext3_journal_stop(handle);
2246 if (!ret)
2247 ret = err;
2248 return ret;
2249 }
2250
2251 static int ext3_dquot_drop(struct inode *inode)
2252 {
2253 handle_t *handle;
2254 int ret, err;
2255
2256 /* We may delete quota structure so we need to reserve enough blocks */
2257 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS);
2258 if (IS_ERR(handle))
2259 return PTR_ERR(handle);
2260 ret = dquot_drop(inode);
2261 err = ext3_journal_stop(handle);
2262 if (!ret)
2263 ret = err;
2264 return ret;
2265 }
2266
2267 static int ext3_write_dquot(struct dquot *dquot)
2268 {
2269 int ret, err;
2270 handle_t *handle;
2271 struct inode *inode;
2272
2273 inode = dquot_to_inode(dquot);
2274 handle = ext3_journal_start(inode,
2275 EXT3_QUOTA_TRANS_BLOCKS);
2276 if (IS_ERR(handle))
2277 return PTR_ERR(handle);
2278 ret = dquot_commit(dquot);
2279 err = ext3_journal_stop(handle);
2280 if (!ret)
2281 ret = err;
2282 return ret;
2283 }
2284
2285 static int ext3_acquire_dquot(struct dquot *dquot)
2286 {
2287 int ret, err;
2288 handle_t *handle;
2289
2290 handle = ext3_journal_start(dquot_to_inode(dquot),
2291 EXT3_QUOTA_INIT_BLOCKS);
2292 if (IS_ERR(handle))
2293 return PTR_ERR(handle);
2294 ret = dquot_acquire(dquot);
2295 err = ext3_journal_stop(handle);
2296 if (!ret)
2297 ret = err;
2298 return ret;
2299 }
2300
2301 static int ext3_release_dquot(struct dquot *dquot)
2302 {
2303 int ret, err;
2304 handle_t *handle;
2305
2306 handle = ext3_journal_start(dquot_to_inode(dquot),
2307 EXT3_QUOTA_INIT_BLOCKS);
2308 if (IS_ERR(handle))
2309 return PTR_ERR(handle);
2310 ret = dquot_release(dquot);
2311 err = ext3_journal_stop(handle);
2312 if (!ret)
2313 ret = err;
2314 return ret;
2315 }
2316
2317 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2318 {
2319 /* Are we journalling quotas? */
2320 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2321 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2322 dquot_mark_dquot_dirty(dquot);
2323 return ext3_write_dquot(dquot);
2324 } else {
2325 return dquot_mark_dquot_dirty(dquot);
2326 }
2327 }
2328
2329 static int ext3_write_info(struct super_block *sb, int type)
2330 {
2331 int ret, err;
2332 handle_t *handle;
2333
2334 /* Data block + inode block */
2335 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2336 if (IS_ERR(handle))
2337 return PTR_ERR(handle);
2338 ret = dquot_commit_info(sb, type);
2339 err = ext3_journal_stop(handle);
2340 if (!ret)
2341 ret = err;
2342 return ret;
2343 }
2344
2345 /*
2346 * Turn on quotas during mount time - we need to find
2347 * the quota file and such...
2348 */
2349 static int ext3_quota_on_mount(struct super_block *sb, int type)
2350 {
2351 int err;
2352 struct dentry *dentry;
2353 struct qstr name = { .name = EXT3_SB(sb)->s_qf_names[type],
2354 .hash = 0,
2355 .len = strlen(EXT3_SB(sb)->s_qf_names[type])};
2356
2357 dentry = lookup_hash(&name, sb->s_root);
2358 if (IS_ERR(dentry))
2359 return PTR_ERR(dentry);
2360 err = vfs_quota_on_mount(type, EXT3_SB(sb)->s_jquota_fmt, dentry);
2361 /* Now invalidate and put the dentry - quota got its own reference
2362 * to inode and dentry has at least wrong hash so we had better
2363 * throw it away */
2364 d_invalidate(dentry);
2365 dput(dentry);
2366 return err;
2367 }
2368
2369 /*
2370 * Standard function to be called on quota_on
2371 */
2372 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2373 char *path)
2374 {
2375 int err;
2376 struct nameidata nd;
2377
2378 /* Not journalling quota? */
2379 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2380 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2381 return vfs_quota_on(sb, type, format_id, path);
2382 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2383 if (err)
2384 return err;
2385 /* Quotafile not on the same filesystem? */
2386 if (nd.mnt->mnt_sb != sb) {
2387 path_release(&nd);
2388 return -EXDEV;
2389 }
2390 /* Quotafile not of fs root? */
2391 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2392 printk(KERN_WARNING
2393 "EXT3-fs: Quota file not on filesystem root. "
2394 "Journalled quota will not work.\n");
2395 path_release(&nd);
2396 return vfs_quota_on(sb, type, format_id, path);
2397 }
2398
2399 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2400 * acquiring the locks... As quota files are never truncated and quota code
2401 * itself serializes the operations (and noone else should touch the files)
2402 * we don't have to be afraid of races */
2403 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2404 size_t len, loff_t off)
2405 {
2406 struct inode *inode = sb_dqopt(sb)->files[type];
2407 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2408 int err = 0;
2409 int offset = off & (sb->s_blocksize - 1);
2410 int tocopy;
2411 size_t toread;
2412 struct buffer_head *bh;
2413 loff_t i_size = i_size_read(inode);
2414
2415 if (off > i_size)
2416 return 0;
2417 if (off+len > i_size)
2418 len = i_size-off;
2419 toread = len;
2420 while (toread > 0) {
2421 tocopy = sb->s_blocksize - offset < toread ?
2422 sb->s_blocksize - offset : toread;
2423 bh = ext3_bread(NULL, inode, blk, 0, &err);
2424 if (err)
2425 return err;
2426 if (!bh) /* A hole? */
2427 memset(data, 0, tocopy);
2428 else
2429 memcpy(data, bh->b_data+offset, tocopy);
2430 brelse(bh);
2431 offset = 0;
2432 toread -= tocopy;
2433 data += tocopy;
2434 blk++;
2435 }
2436 return len;
2437 }
2438
2439 /* Write to quotafile (we know the transaction is already started and has
2440 * enough credits) */
2441 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2442 const char *data, size_t len, loff_t off)
2443 {
2444 struct inode *inode = sb_dqopt(sb)->files[type];
2445 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2446 int err = 0;
2447 int offset = off & (sb->s_blocksize - 1);
2448 int tocopy;
2449 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2450 size_t towrite = len;
2451 struct buffer_head *bh;
2452 handle_t *handle = journal_current_handle();
2453
2454 down(&inode->i_sem);
2455 while (towrite > 0) {
2456 tocopy = sb->s_blocksize - offset < towrite ?
2457 sb->s_blocksize - offset : towrite;
2458 bh = ext3_bread(handle, inode, blk, 1, &err);
2459 if (!bh)
2460 goto out;
2461 if (journal_quota) {
2462 err = ext3_journal_get_write_access(handle, bh);
2463 if (err) {
2464 brelse(bh);
2465 goto out;
2466 }
2467 }
2468 lock_buffer(bh);
2469 memcpy(bh->b_data+offset, data, tocopy);
2470 flush_dcache_page(bh->b_page);
2471 unlock_buffer(bh);
2472 if (journal_quota)
2473 err = ext3_journal_dirty_metadata(handle, bh);
2474 else {
2475 /* Always do at least ordered writes for quotas */
2476 err = ext3_journal_dirty_data(handle, bh);
2477 mark_buffer_dirty(bh);
2478 }
2479 brelse(bh);
2480 if (err)
2481 goto out;
2482 offset = 0;
2483 towrite -= tocopy;
2484 data += tocopy;
2485 blk++;
2486 }
2487 out:
2488 if (len == towrite)
2489 return err;
2490 if (inode->i_size < off+len-towrite) {
2491 i_size_write(inode, off+len-towrite);
2492 EXT3_I(inode)->i_disksize = inode->i_size;
2493 }
2494 inode->i_version++;
2495 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2496 ext3_mark_inode_dirty(handle, inode);
2497 up(&inode->i_sem);
2498 return len - towrite;
2499 }
2500
2501 #endif
2502
2503 static struct super_block *ext3_get_sb(struct file_system_type *fs_type,
2504 int flags, const char *dev_name, void *data)
2505 {
2506 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
2507 }
2508
2509 static struct file_system_type ext3_fs_type = {
2510 .owner = THIS_MODULE,
2511 .name = "ext3",
2512 .get_sb = ext3_get_sb,
2513 .kill_sb = kill_block_super,
2514 .fs_flags = FS_REQUIRES_DEV,
2515 };
2516
2517 static int __init init_ext3_fs(void)
2518 {
2519 int err = init_ext3_xattr();
2520 if (err)
2521 return err;
2522 err = init_inodecache();
2523 if (err)
2524 goto out1;
2525 err = register_filesystem(&ext3_fs_type);
2526 if (err)
2527 goto out;
2528 return 0;
2529 out:
2530 destroy_inodecache();
2531 out1:
2532 exit_ext3_xattr();
2533 return err;
2534 }
2535
2536 static void __exit exit_ext3_fs(void)
2537 {
2538 unregister_filesystem(&ext3_fs_type);
2539 destroy_inodecache();
2540 exit_ext3_xattr();
2541 }
2542
2543 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2544 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2545 MODULE_LICENSE("GPL");
2546 module_init(init_ext3_fs)
2547 module_exit(exit_ext3_fs)
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