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[PATCH] dvb: ttpci: fix timeout handling to be save with PREEMPT
[linux-2.6/verdex.git] / fs / ext3 / super.c
bloba6d1779d7de4a00fcc205142bb54dd2e83efb0a2
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, Opt_quota, Opt_noquota,
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_quota, "grpquota"},
638 {Opt_noquota, "noquota"},
639 {Opt_quota, "quota"},
640 {Opt_quota, "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 set_opt(sbi->s_mount_opt, QUOTA);
880 break;
881 case Opt_offusrjquota:
882 qtype = USRQUOTA;
883 goto clear_qf_name;
884 case Opt_offgrpjquota:
885 qtype = GRPQUOTA;
886 clear_qf_name:
887 if (sb_any_quota_enabled(sb)) {
888 printk(KERN_ERR "EXT3-fs: Cannot change "
889 "journalled quota options when "
890 "quota turned on.\n");
891 return 0;
892 }
893 kfree(sbi->s_qf_names[qtype]);
894 sbi->s_qf_names[qtype] = NULL;
895 break;
896 case Opt_jqfmt_vfsold:
897 sbi->s_jquota_fmt = QFMT_VFS_OLD;
898 break;
899 case Opt_jqfmt_vfsv0:
900 sbi->s_jquota_fmt = QFMT_VFS_V0;
901 break;
902 case Opt_quota:
903 set_opt(sbi->s_mount_opt, QUOTA);
904 break;
905 case Opt_noquota:
906 if (sb_any_quota_enabled(sb)) {
907 printk(KERN_ERR "EXT3-fs: Cannot change quota "
908 "options when quota turned on.\n");
909 return 0;
910 }
911 clear_opt(sbi->s_mount_opt, QUOTA);
912 break;
913 #else
914 case Opt_usrjquota:
915 case Opt_grpjquota:
916 case Opt_offusrjquota:
917 case Opt_offgrpjquota:
918 case Opt_jqfmt_vfsold:
919 case Opt_jqfmt_vfsv0:
920 printk(KERN_ERR
921 "EXT3-fs: journalled quota options not "
922 "supported.\n");
923 break;
924 case Opt_quota:
925 case Opt_noquota:
926 break;
927 #endif
928 case Opt_abort:
929 set_opt(sbi->s_mount_opt, ABORT);
930 break;
931 case Opt_barrier:
932 if (match_int(&args[0], &option))
933 return 0;
934 if (option)
935 set_opt(sbi->s_mount_opt, BARRIER);
936 else
937 clear_opt(sbi->s_mount_opt, BARRIER);
938 break;
939 case Opt_ignore:
940 break;
941 case Opt_resize:
942 if (!n_blocks_count) {
943 printk("EXT3-fs: resize option only available "
944 "for remount\n");
945 return 0;
946 }
947 if (match_int(&args[0], &option) != 0)
948 return 0;
949 *n_blocks_count = option;
950 break;
951 case Opt_nobh:
952 set_opt(sbi->s_mount_opt, NOBH);
953 break;
954 default:
955 printk (KERN_ERR
956 "EXT3-fs: Unrecognized mount option \"%s\" "
957 "or missing value\n", p);
958 return 0;
959 }
960 }
961 #ifdef CONFIG_QUOTA
962 if (!sbi->s_jquota_fmt && (sbi->s_qf_names[USRQUOTA] ||
963 sbi->s_qf_names[GRPQUOTA])) {
964 printk(KERN_ERR
965 "EXT3-fs: journalled quota format not specified.\n");
966 return 0;
967 }
968 #endif
969
970 return 1;
971 }
972
973 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
974 int read_only)
975 {
976 struct ext3_sb_info *sbi = EXT3_SB(sb);
977 int res = 0;
978
979 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
980 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
981 "forcing read-only mode\n");
982 res = MS_RDONLY;
983 }
984 if (read_only)
985 return res;
986 if (!(sbi->s_mount_state & EXT3_VALID_FS))
987 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
988 "running e2fsck is recommended\n");
989 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
990 printk (KERN_WARNING
991 "EXT3-fs warning: mounting fs with errors, "
992 "running e2fsck is recommended\n");
993 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
994 le16_to_cpu(es->s_mnt_count) >=
995 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
996 printk (KERN_WARNING
997 "EXT3-fs warning: maximal mount count reached, "
998 "running e2fsck is recommended\n");
999 else if (le32_to_cpu(es->s_checkinterval) &&
1000 (le32_to_cpu(es->s_lastcheck) +
1001 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1002 printk (KERN_WARNING
1003 "EXT3-fs warning: checktime reached, "
1004 "running e2fsck is recommended\n");
1005 #if 0
1006 /* @@@ We _will_ want to clear the valid bit if we find
1007 inconsistencies, to force a fsck at reboot. But for
1008 a plain journaled filesystem we can keep it set as
1009 valid forever! :) */
1010 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1011 #endif
1012 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1013 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1014 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1015 es->s_mtime = cpu_to_le32(get_seconds());
1016 ext3_update_dynamic_rev(sb);
1017 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1018
1019 ext3_commit_super(sb, es, 1);
1020 if (test_opt(sb, DEBUG))
1021 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1022 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1023 sb->s_blocksize,
1024 sbi->s_groups_count,
1025 EXT3_BLOCKS_PER_GROUP(sb),
1026 EXT3_INODES_PER_GROUP(sb),
1027 sbi->s_mount_opt);
1028
1029 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1030 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1031 char b[BDEVNAME_SIZE];
1032
1033 printk("external journal on %s\n",
1034 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1035 } else {
1036 printk("internal journal\n");
1037 }
1038 #ifdef CONFIG_EXT3_CHECK
1039 if (test_opt (sb, CHECK)) {
1040 ext3_check_blocks_bitmap (sb);
1041 ext3_check_inodes_bitmap (sb);
1042 }
1043 #endif
1044 return res;
1045 }
1046
1047 /* Called at mount-time, super-block is locked */
1048 static int ext3_check_descriptors (struct super_block * sb)
1049 {
1050 struct ext3_sb_info *sbi = EXT3_SB(sb);
1051 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1052 struct ext3_group_desc * gdp = NULL;
1053 int desc_block = 0;
1054 int i;
1055
1056 ext3_debug ("Checking group descriptors");
1057
1058 for (i = 0; i < sbi->s_groups_count; i++)
1059 {
1060 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1061 gdp = (struct ext3_group_desc *)
1062 sbi->s_group_desc[desc_block++]->b_data;
1063 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1064 le32_to_cpu(gdp->bg_block_bitmap) >=
1065 block + EXT3_BLOCKS_PER_GROUP(sb))
1066 {
1067 ext3_error (sb, "ext3_check_descriptors",
1068 "Block bitmap for group %d"
1069 " not in group (block %lu)!",
1070 i, (unsigned long)
1071 le32_to_cpu(gdp->bg_block_bitmap));
1072 return 0;
1073 }
1074 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1075 le32_to_cpu(gdp->bg_inode_bitmap) >=
1076 block + EXT3_BLOCKS_PER_GROUP(sb))
1077 {
1078 ext3_error (sb, "ext3_check_descriptors",
1079 "Inode bitmap for group %d"
1080 " not in group (block %lu)!",
1081 i, (unsigned long)
1082 le32_to_cpu(gdp->bg_inode_bitmap));
1083 return 0;
1084 }
1085 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1086 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1087 block + EXT3_BLOCKS_PER_GROUP(sb))
1088 {
1089 ext3_error (sb, "ext3_check_descriptors",
1090 "Inode table for group %d"
1091 " not in group (block %lu)!",
1092 i, (unsigned long)
1093 le32_to_cpu(gdp->bg_inode_table));
1094 return 0;
1095 }
1096 block += EXT3_BLOCKS_PER_GROUP(sb);
1097 gdp++;
1098 }
1099
1100 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1101 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1102 return 1;
1103 }
1104
1105
1106 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1107 * the superblock) which were deleted from all directories, but held open by
1108 * a process at the time of a crash. We walk the list and try to delete these
1109 * inodes at recovery time (only with a read-write filesystem).
1110 *
1111 * In order to keep the orphan inode chain consistent during traversal (in
1112 * case of crash during recovery), we link each inode into the superblock
1113 * orphan list_head and handle it the same way as an inode deletion during
1114 * normal operation (which journals the operations for us).
1115 *
1116 * We only do an iget() and an iput() on each inode, which is very safe if we
1117 * accidentally point at an in-use or already deleted inode. The worst that
1118 * can happen in this case is that we get a "bit already cleared" message from
1119 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1120 * e2fsck was run on this filesystem, and it must have already done the orphan
1121 * inode cleanup for us, so we can safely abort without any further action.
1122 */
1123 static void ext3_orphan_cleanup (struct super_block * sb,
1124 struct ext3_super_block * es)
1125 {
1126 unsigned int s_flags = sb->s_flags;
1127 int nr_orphans = 0, nr_truncates = 0;
1128 #ifdef CONFIG_QUOTA
1129 int i;
1130 #endif
1131 if (!es->s_last_orphan) {
1132 jbd_debug(4, "no orphan inodes to clean up\n");
1133 return;
1134 }
1135
1136 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1137 if (es->s_last_orphan)
1138 jbd_debug(1, "Errors on filesystem, "
1139 "clearing orphan list.\n");
1140 es->s_last_orphan = 0;
1141 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1142 return;
1143 }
1144
1145 if (s_flags & MS_RDONLY) {
1146 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1147 sb->s_id);
1148 sb->s_flags &= ~MS_RDONLY;
1149 }
1150 #ifdef CONFIG_QUOTA
1151 /* Needed for iput() to work correctly and not trash data */
1152 sb->s_flags |= MS_ACTIVE;
1153 /* Turn on quotas so that they are updated correctly */
1154 for (i = 0; i < MAXQUOTAS; i++) {
1155 if (EXT3_SB(sb)->s_qf_names[i]) {
1156 int ret = ext3_quota_on_mount(sb, i);
1157 if (ret < 0)
1158 printk(KERN_ERR
1159 "EXT3-fs: Cannot turn on journalled "
1160 "quota: error %d\n", ret);
1161 }
1162 }
1163 #endif
1164
1165 while (es->s_last_orphan) {
1166 struct inode *inode;
1167
1168 if (!(inode =
1169 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1170 es->s_last_orphan = 0;
1171 break;
1172 }
1173
1174 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1175 DQUOT_INIT(inode);
1176 if (inode->i_nlink) {
1177 printk(KERN_DEBUG
1178 "%s: truncating inode %ld to %Ld bytes\n",
1179 __FUNCTION__, inode->i_ino, inode->i_size);
1180 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1181 inode->i_ino, inode->i_size);
1182 ext3_truncate(inode);
1183 nr_truncates++;
1184 } else {
1185 printk(KERN_DEBUG
1186 "%s: deleting unreferenced inode %ld\n",
1187 __FUNCTION__, inode->i_ino);
1188 jbd_debug(2, "deleting unreferenced inode %ld\n",
1189 inode->i_ino);
1190 nr_orphans++;
1191 }
1192 iput(inode); /* The delete magic happens here! */
1193 }
1194
1195 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1196
1197 if (nr_orphans)
1198 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1199 sb->s_id, PLURAL(nr_orphans));
1200 if (nr_truncates)
1201 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1202 sb->s_id, PLURAL(nr_truncates));
1203 #ifdef CONFIG_QUOTA
1204 /* Turn quotas off */
1205 for (i = 0; i < MAXQUOTAS; i++) {
1206 if (sb_dqopt(sb)->files[i])
1207 vfs_quota_off(sb, i);
1208 }
1209 #endif
1210 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1211 }
1212
1213 #define log2(n) ffz(~(n))
1214
1215 /*
1216 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1217 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1218 * We need to be 1 filesystem block less than the 2^32 sector limit.
1219 */
1220 static loff_t ext3_max_size(int bits)
1221 {
1222 loff_t res = EXT3_NDIR_BLOCKS;
1223 /* This constant is calculated to be the largest file size for a
1224 * dense, 4k-blocksize file such that the total number of
1225 * sectors in the file, including data and all indirect blocks,
1226 * does not exceed 2^32. */
1227 const loff_t upper_limit = 0x1ff7fffd000LL;
1228
1229 res += 1LL << (bits-2);
1230 res += 1LL << (2*(bits-2));
1231 res += 1LL << (3*(bits-2));
1232 res <<= bits;
1233 if (res > upper_limit)
1234 res = upper_limit;
1235 return res;
1236 }
1237
1238 static unsigned long descriptor_loc(struct super_block *sb,
1239 unsigned long logic_sb_block,
1240 int nr)
1241 {
1242 struct ext3_sb_info *sbi = EXT3_SB(sb);
1243 unsigned long bg, first_data_block, first_meta_bg;
1244 int has_super = 0;
1245
1246 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1247 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1248
1249 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1250 nr < first_meta_bg)
1251 return (logic_sb_block + nr + 1);
1252 bg = sbi->s_desc_per_block * nr;
1253 if (ext3_bg_has_super(sb, bg))
1254 has_super = 1;
1255 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1256 }
1257
1258
1259 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1260 {
1261 struct buffer_head * bh;
1262 struct ext3_super_block *es = NULL;
1263 struct ext3_sb_info *sbi;
1264 unsigned long block;
1265 unsigned long sb_block = get_sb_block(&data);
1266 unsigned long logic_sb_block;
1267 unsigned long offset = 0;
1268 unsigned long journal_inum = 0;
1269 unsigned long def_mount_opts;
1270 struct inode *root;
1271 int blocksize;
1272 int hblock;
1273 int db_count;
1274 int i;
1275 int needs_recovery;
1276 __le32 features;
1277
1278 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1279 if (!sbi)
1280 return -ENOMEM;
1281 sb->s_fs_info = sbi;
1282 memset(sbi, 0, sizeof(*sbi));
1283 sbi->s_mount_opt = 0;
1284 sbi->s_resuid = EXT3_DEF_RESUID;
1285 sbi->s_resgid = EXT3_DEF_RESGID;
1286
1287 unlock_kernel();
1288
1289 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1290 if (!blocksize) {
1291 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1292 goto out_fail;
1293 }
1294
1295 /*
1296 * The ext3 superblock will not be buffer aligned for other than 1kB
1297 * block sizes. We need to calculate the offset from buffer start.
1298 */
1299 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1300 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1301 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1302 } else {
1303 logic_sb_block = sb_block;
1304 }
1305
1306 if (!(bh = sb_bread(sb, logic_sb_block))) {
1307 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1308 goto out_fail;
1309 }
1310 /*
1311 * Note: s_es must be initialized as soon as possible because
1312 * some ext3 macro-instructions depend on its value
1313 */
1314 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1315 sbi->s_es = es;
1316 sb->s_magic = le16_to_cpu(es->s_magic);
1317 if (sb->s_magic != EXT3_SUPER_MAGIC)
1318 goto cantfind_ext3;
1319
1320 /* Set defaults before we parse the mount options */
1321 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1322 if (def_mount_opts & EXT3_DEFM_DEBUG)
1323 set_opt(sbi->s_mount_opt, DEBUG);
1324 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1325 set_opt(sbi->s_mount_opt, GRPID);
1326 if (def_mount_opts & EXT3_DEFM_UID16)
1327 set_opt(sbi->s_mount_opt, NO_UID32);
1328 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1329 set_opt(sbi->s_mount_opt, XATTR_USER);
1330 if (def_mount_opts & EXT3_DEFM_ACL)
1331 set_opt(sbi->s_mount_opt, POSIX_ACL);
1332 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1333 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1334 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1335 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1336 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1337 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1338
1339 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1340 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1341 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1342 set_opt(sbi->s_mount_opt, ERRORS_RO);
1343
1344 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1345 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1346
1347 set_opt(sbi->s_mount_opt, RESERVATION);
1348
1349 if (!parse_options ((char *) data, sb, &journal_inum, NULL, 0))
1350 goto failed_mount;
1351
1352 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1353 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1354
1355 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1356 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1357 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1358 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1359 printk(KERN_WARNING
1360 "EXT3-fs warning: feature flags set on rev 0 fs, "
1361 "running e2fsck is recommended\n");
1362 /*
1363 * Check feature flags regardless of the revision level, since we
1364 * previously didn't change the revision level when setting the flags,
1365 * so there is a chance incompat flags are set on a rev 0 filesystem.
1366 */
1367 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1368 if (features) {
1369 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1370 "unsupported optional features (%x).\n",
1371 sb->s_id, le32_to_cpu(features));
1372 goto failed_mount;
1373 }
1374 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1375 if (!(sb->s_flags & MS_RDONLY) && features) {
1376 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1377 "unsupported optional features (%x).\n",
1378 sb->s_id, le32_to_cpu(features));
1379 goto failed_mount;
1380 }
1381 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1382
1383 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1384 blocksize > EXT3_MAX_BLOCK_SIZE) {
1385 printk(KERN_ERR
1386 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1387 blocksize, sb->s_id);
1388 goto failed_mount;
1389 }
1390
1391 hblock = bdev_hardsect_size(sb->s_bdev);
1392 if (sb->s_blocksize != blocksize) {
1393 /*
1394 * Make sure the blocksize for the filesystem is larger
1395 * than the hardware sectorsize for the machine.
1396 */
1397 if (blocksize < hblock) {
1398 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1399 "device blocksize %d.\n", blocksize, hblock);
1400 goto failed_mount;
1401 }
1402
1403 brelse (bh);
1404 sb_set_blocksize(sb, blocksize);
1405 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1406 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1407 bh = sb_bread(sb, logic_sb_block);
1408 if (!bh) {
1409 printk(KERN_ERR
1410 "EXT3-fs: Can't read superblock on 2nd try.\n");
1411 goto failed_mount;
1412 }
1413 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1414 sbi->s_es = es;
1415 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1416 printk (KERN_ERR
1417 "EXT3-fs: Magic mismatch, very weird !\n");
1418 goto failed_mount;
1419 }
1420 }
1421
1422 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1423
1424 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1425 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1426 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1427 } else {
1428 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1429 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1430 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1431 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1432 (sbi->s_inode_size > blocksize)) {
1433 printk (KERN_ERR
1434 "EXT3-fs: unsupported inode size: %d\n",
1435 sbi->s_inode_size);
1436 goto failed_mount;
1437 }
1438 }
1439 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1440 le32_to_cpu(es->s_log_frag_size);
1441 if (blocksize != sbi->s_frag_size) {
1442 printk(KERN_ERR
1443 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1444 sbi->s_frag_size, blocksize);
1445 goto failed_mount;
1446 }
1447 sbi->s_frags_per_block = 1;
1448 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1449 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1450 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1451 if (EXT3_INODE_SIZE(sb) == 0)
1452 goto cantfind_ext3;
1453 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1454 if (sbi->s_inodes_per_block == 0)
1455 goto cantfind_ext3;
1456 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1457 sbi->s_inodes_per_block;
1458 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1459 sbi->s_sbh = bh;
1460 sbi->s_mount_state = le16_to_cpu(es->s_state);
1461 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1462 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1463 for (i=0; i < 4; i++)
1464 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1465 sbi->s_def_hash_version = es->s_def_hash_version;
1466
1467 if (sbi->s_blocks_per_group > blocksize * 8) {
1468 printk (KERN_ERR
1469 "EXT3-fs: #blocks per group too big: %lu\n",
1470 sbi->s_blocks_per_group);
1471 goto failed_mount;
1472 }
1473 if (sbi->s_frags_per_group > blocksize * 8) {
1474 printk (KERN_ERR
1475 "EXT3-fs: #fragments per group too big: %lu\n",
1476 sbi->s_frags_per_group);
1477 goto failed_mount;
1478 }
1479 if (sbi->s_inodes_per_group > blocksize * 8) {
1480 printk (KERN_ERR
1481 "EXT3-fs: #inodes per group too big: %lu\n",
1482 sbi->s_inodes_per_group);
1483 goto failed_mount;
1484 }
1485
1486 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1487 goto cantfind_ext3;
1488 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1489 le32_to_cpu(es->s_first_data_block) +
1490 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1491 EXT3_BLOCKS_PER_GROUP(sb);
1492 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1493 EXT3_DESC_PER_BLOCK(sb);
1494 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1495 GFP_KERNEL);
1496 if (sbi->s_group_desc == NULL) {
1497 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1498 goto failed_mount;
1499 }
1500
1501 percpu_counter_init(&sbi->s_freeblocks_counter);
1502 percpu_counter_init(&sbi->s_freeinodes_counter);
1503 percpu_counter_init(&sbi->s_dirs_counter);
1504 bgl_lock_init(&sbi->s_blockgroup_lock);
1505
1506 for (i = 0; i < db_count; i++) {
1507 block = descriptor_loc(sb, logic_sb_block, i);
1508 sbi->s_group_desc[i] = sb_bread(sb, block);
1509 if (!sbi->s_group_desc[i]) {
1510 printk (KERN_ERR "EXT3-fs: "
1511 "can't read group descriptor %d\n", i);
1512 db_count = i;
1513 goto failed_mount2;
1514 }
1515 }
1516 if (!ext3_check_descriptors (sb)) {
1517 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1518 goto failed_mount2;
1519 }
1520 sbi->s_gdb_count = db_count;
1521 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1522 spin_lock_init(&sbi->s_next_gen_lock);
1523 /* per fileystem reservation list head & lock */
1524 spin_lock_init(&sbi->s_rsv_window_lock);
1525 sbi->s_rsv_window_root = RB_ROOT;
1526 /* Add a single, static dummy reservation to the start of the
1527 * reservation window list --- it gives us a placeholder for
1528 * append-at-start-of-list which makes the allocation logic
1529 * _much_ simpler. */
1530 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1531 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1532 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1533 sbi->s_rsv_window_head.rsv_goal_size = 0;
1534 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1535
1536 /*
1537 * set up enough so that it can read an inode
1538 */
1539 sb->s_op = &ext3_sops;
1540 sb->s_export_op = &ext3_export_ops;
1541 sb->s_xattr = ext3_xattr_handlers;
1542 #ifdef CONFIG_QUOTA
1543 sb->s_qcop = &ext3_qctl_operations;
1544 sb->dq_op = &ext3_quota_operations;
1545 #endif
1546 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1547
1548 sb->s_root = NULL;
1549
1550 needs_recovery = (es->s_last_orphan != 0 ||
1551 EXT3_HAS_INCOMPAT_FEATURE(sb,
1552 EXT3_FEATURE_INCOMPAT_RECOVER));
1553
1554 /*
1555 * The first inode we look at is the journal inode. Don't try
1556 * root first: it may be modified in the journal!
1557 */
1558 if (!test_opt(sb, NOLOAD) &&
1559 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1560 if (ext3_load_journal(sb, es))
1561 goto failed_mount2;
1562 } else if (journal_inum) {
1563 if (ext3_create_journal(sb, es, journal_inum))
1564 goto failed_mount2;
1565 } else {
1566 if (!silent)
1567 printk (KERN_ERR
1568 "ext3: No journal on filesystem on %s\n",
1569 sb->s_id);
1570 goto failed_mount2;
1571 }
1572
1573 /* We have now updated the journal if required, so we can
1574 * validate the data journaling mode. */
1575 switch (test_opt(sb, DATA_FLAGS)) {
1576 case 0:
1577 /* No mode set, assume a default based on the journal
1578 capabilities: ORDERED_DATA if the journal can
1579 cope, else JOURNAL_DATA */
1580 if (journal_check_available_features
1581 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1582 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1583 else
1584 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1585 break;
1586
1587 case EXT3_MOUNT_ORDERED_DATA:
1588 case EXT3_MOUNT_WRITEBACK_DATA:
1589 if (!journal_check_available_features
1590 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1591 printk(KERN_ERR "EXT3-fs: Journal does not support "
1592 "requested data journaling mode\n");
1593 goto failed_mount3;
1594 }
1595 default:
1596 break;
1597 }
1598
1599 if (test_opt(sb, NOBH)) {
1600 if (sb->s_blocksize_bits != PAGE_CACHE_SHIFT) {
1601 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option "
1602 "since filesystem blocksize doesn't match "
1603 "pagesize\n");
1604 clear_opt(sbi->s_mount_opt, NOBH);
1605 }
1606 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1607 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1608 "its supported only with writeback mode\n");
1609 clear_opt(sbi->s_mount_opt, NOBH);
1610 }
1611 }
1612 /*
1613 * The journal_load will have done any necessary log recovery,
1614 * so we can safely mount the rest of the filesystem now.
1615 */
1616
1617 root = iget(sb, EXT3_ROOT_INO);
1618 sb->s_root = d_alloc_root(root);
1619 if (!sb->s_root) {
1620 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1621 iput(root);
1622 goto failed_mount3;
1623 }
1624 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1625 dput(sb->s_root);
1626 sb->s_root = NULL;
1627 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1628 goto failed_mount3;
1629 }
1630
1631 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1632 /*
1633 * akpm: core read_super() calls in here with the superblock locked.
1634 * That deadlocks, because orphan cleanup needs to lock the superblock
1635 * in numerous places. Here we just pop the lock - it's relatively
1636 * harmless, because we are now ready to accept write_super() requests,
1637 * and aviro says that's the only reason for hanging onto the
1638 * superblock lock.
1639 */
1640 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1641 ext3_orphan_cleanup(sb, es);
1642 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1643 if (needs_recovery)
1644 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1645 ext3_mark_recovery_complete(sb, es);
1646 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1647 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1648 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1649 "writeback");
1650
1651 percpu_counter_mod(&sbi->s_freeblocks_counter,
1652 ext3_count_free_blocks(sb));
1653 percpu_counter_mod(&sbi->s_freeinodes_counter,
1654 ext3_count_free_inodes(sb));
1655 percpu_counter_mod(&sbi->s_dirs_counter,
1656 ext3_count_dirs(sb));
1657
1658 lock_kernel();
1659 return 0;
1660
1661 cantfind_ext3:
1662 if (!silent)
1663 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1664 sb->s_id);
1665 goto failed_mount;
1666
1667 failed_mount3:
1668 journal_destroy(sbi->s_journal);
1669 failed_mount2:
1670 for (i = 0; i < db_count; i++)
1671 brelse(sbi->s_group_desc[i]);
1672 kfree(sbi->s_group_desc);
1673 failed_mount:
1674 #ifdef CONFIG_QUOTA
1675 for (i = 0; i < MAXQUOTAS; i++)
1676 kfree(sbi->s_qf_names[i]);
1677 #endif
1678 ext3_blkdev_remove(sbi);
1679 brelse(bh);
1680 out_fail:
1681 sb->s_fs_info = NULL;
1682 kfree(sbi);
1683 lock_kernel();
1684 return -EINVAL;
1685 }
1686
1687 /*
1688 * Setup any per-fs journal parameters now. We'll do this both on
1689 * initial mount, once the journal has been initialised but before we've
1690 * done any recovery; and again on any subsequent remount.
1691 */
1692 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1693 {
1694 struct ext3_sb_info *sbi = EXT3_SB(sb);
1695
1696 if (sbi->s_commit_interval)
1697 journal->j_commit_interval = sbi->s_commit_interval;
1698 /* We could also set up an ext3-specific default for the commit
1699 * interval here, but for now we'll just fall back to the jbd
1700 * default. */
1701
1702 spin_lock(&journal->j_state_lock);
1703 if (test_opt(sb, BARRIER))
1704 journal->j_flags |= JFS_BARRIER;
1705 else
1706 journal->j_flags &= ~JFS_BARRIER;
1707 spin_unlock(&journal->j_state_lock);
1708 }
1709
1710 static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1711 {
1712 struct inode *journal_inode;
1713 journal_t *journal;
1714
1715 /* First, test for the existence of a valid inode on disk. Bad
1716 * things happen if we iget() an unused inode, as the subsequent
1717 * iput() will try to delete it. */
1718
1719 journal_inode = iget(sb, journal_inum);
1720 if (!journal_inode) {
1721 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1722 return NULL;
1723 }
1724 if (!journal_inode->i_nlink) {
1725 make_bad_inode(journal_inode);
1726 iput(journal_inode);
1727 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1728 return NULL;
1729 }
1730
1731 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1732 journal_inode, journal_inode->i_size);
1733 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1734 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1735 iput(journal_inode);
1736 return NULL;
1737 }
1738
1739 journal = journal_init_inode(journal_inode);
1740 if (!journal) {
1741 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1742 iput(journal_inode);
1743 return NULL;
1744 }
1745 journal->j_private = sb;
1746 ext3_init_journal_params(sb, journal);
1747 return journal;
1748 }
1749
1750 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1751 dev_t j_dev)
1752 {
1753 struct buffer_head * bh;
1754 journal_t *journal;
1755 int start;
1756 int len;
1757 int hblock, blocksize;
1758 unsigned long sb_block;
1759 unsigned long offset;
1760 struct ext3_super_block * es;
1761 struct block_device *bdev;
1762
1763 bdev = ext3_blkdev_get(j_dev);
1764 if (bdev == NULL)
1765 return NULL;
1766
1767 if (bd_claim(bdev, sb)) {
1768 printk(KERN_ERR
1769 "EXT3: failed to claim external journal device.\n");
1770 blkdev_put(bdev);
1771 return NULL;
1772 }
1773
1774 blocksize = sb->s_blocksize;
1775 hblock = bdev_hardsect_size(bdev);
1776 if (blocksize < hblock) {
1777 printk(KERN_ERR
1778 "EXT3-fs: blocksize too small for journal device.\n");
1779 goto out_bdev;
1780 }
1781
1782 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1783 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1784 set_blocksize(bdev, blocksize);
1785 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1786 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1787 "external journal\n");
1788 goto out_bdev;
1789 }
1790
1791 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1792 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1793 !(le32_to_cpu(es->s_feature_incompat) &
1794 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1795 printk(KERN_ERR "EXT3-fs: external journal has "
1796 "bad superblock\n");
1797 brelse(bh);
1798 goto out_bdev;
1799 }
1800
1801 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1802 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1803 brelse(bh);
1804 goto out_bdev;
1805 }
1806
1807 len = le32_to_cpu(es->s_blocks_count);
1808 start = sb_block + 1;
1809 brelse(bh); /* we're done with the superblock */
1810
1811 journal = journal_init_dev(bdev, sb->s_bdev,
1812 start, len, blocksize);
1813 if (!journal) {
1814 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1815 goto out_bdev;
1816 }
1817 journal->j_private = sb;
1818 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1819 wait_on_buffer(journal->j_sb_buffer);
1820 if (!buffer_uptodate(journal->j_sb_buffer)) {
1821 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1822 goto out_journal;
1823 }
1824 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1825 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1826 "user (unsupported) - %d\n",
1827 be32_to_cpu(journal->j_superblock->s_nr_users));
1828 goto out_journal;
1829 }
1830 EXT3_SB(sb)->journal_bdev = bdev;
1831 ext3_init_journal_params(sb, journal);
1832 return journal;
1833 out_journal:
1834 journal_destroy(journal);
1835 out_bdev:
1836 ext3_blkdev_put(bdev);
1837 return NULL;
1838 }
1839
1840 static int ext3_load_journal(struct super_block * sb,
1841 struct ext3_super_block * es)
1842 {
1843 journal_t *journal;
1844 int journal_inum = le32_to_cpu(es->s_journal_inum);
1845 dev_t journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1846 int err = 0;
1847 int really_read_only;
1848
1849 really_read_only = bdev_read_only(sb->s_bdev);
1850
1851 /*
1852 * Are we loading a blank journal or performing recovery after a
1853 * crash? For recovery, we need to check in advance whether we
1854 * can get read-write access to the device.
1855 */
1856
1857 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1858 if (sb->s_flags & MS_RDONLY) {
1859 printk(KERN_INFO "EXT3-fs: INFO: recovery "
1860 "required on readonly filesystem.\n");
1861 if (really_read_only) {
1862 printk(KERN_ERR "EXT3-fs: write access "
1863 "unavailable, cannot proceed.\n");
1864 return -EROFS;
1865 }
1866 printk (KERN_INFO "EXT3-fs: write access will "
1867 "be enabled during recovery.\n");
1868 }
1869 }
1870
1871 if (journal_inum && journal_dev) {
1872 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1873 "and inode journals!\n");
1874 return -EINVAL;
1875 }
1876
1877 if (journal_inum) {
1878 if (!(journal = ext3_get_journal(sb, journal_inum)))
1879 return -EINVAL;
1880 } else {
1881 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1882 return -EINVAL;
1883 }
1884
1885 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1886 err = journal_update_format(journal);
1887 if (err) {
1888 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1889 journal_destroy(journal);
1890 return err;
1891 }
1892 }
1893
1894 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1895 err = journal_wipe(journal, !really_read_only);
1896 if (!err)
1897 err = journal_load(journal);
1898
1899 if (err) {
1900 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
1901 journal_destroy(journal);
1902 return err;
1903 }
1904
1905 EXT3_SB(sb)->s_journal = journal;
1906 ext3_clear_journal_err(sb, es);
1907 return 0;
1908 }
1909
1910 static int ext3_create_journal(struct super_block * sb,
1911 struct ext3_super_block * es,
1912 int journal_inum)
1913 {
1914 journal_t *journal;
1915
1916 if (sb->s_flags & MS_RDONLY) {
1917 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
1918 "create journal.\n");
1919 return -EROFS;
1920 }
1921
1922 if (!(journal = ext3_get_journal(sb, journal_inum)))
1923 return -EINVAL;
1924
1925 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
1926 journal_inum);
1927
1928 if (journal_create(journal)) {
1929 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
1930 journal_destroy(journal);
1931 return -EIO;
1932 }
1933
1934 EXT3_SB(sb)->s_journal = journal;
1935
1936 ext3_update_dynamic_rev(sb);
1937 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1938 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
1939
1940 es->s_journal_inum = cpu_to_le32(journal_inum);
1941 sb->s_dirt = 1;
1942
1943 /* Make sure we flush the recovery flag to disk. */
1944 ext3_commit_super(sb, es, 1);
1945
1946 return 0;
1947 }
1948
1949 static void ext3_commit_super (struct super_block * sb,
1950 struct ext3_super_block * es,
1951 int sync)
1952 {
1953 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
1954
1955 if (!sbh)
1956 return;
1957 es->s_wtime = cpu_to_le32(get_seconds());
1958 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
1959 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
1960 BUFFER_TRACE(sbh, "marking dirty");
1961 mark_buffer_dirty(sbh);
1962 if (sync)
1963 sync_dirty_buffer(sbh);
1964 }
1965
1966
1967 /*
1968 * Have we just finished recovery? If so, and if we are mounting (or
1969 * remounting) the filesystem readonly, then we will end up with a
1970 * consistent fs on disk. Record that fact.
1971 */
1972 static void ext3_mark_recovery_complete(struct super_block * sb,
1973 struct ext3_super_block * es)
1974 {
1975 journal_t *journal = EXT3_SB(sb)->s_journal;
1976
1977 journal_lock_updates(journal);
1978 journal_flush(journal);
1979 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
1980 sb->s_flags & MS_RDONLY) {
1981 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1982 sb->s_dirt = 0;
1983 ext3_commit_super(sb, es, 1);
1984 }
1985 journal_unlock_updates(journal);
1986 }
1987
1988 /*
1989 * If we are mounting (or read-write remounting) a filesystem whose journal
1990 * has recorded an error from a previous lifetime, move that error to the
1991 * main filesystem now.
1992 */
1993 static void ext3_clear_journal_err(struct super_block * sb,
1994 struct ext3_super_block * es)
1995 {
1996 journal_t *journal;
1997 int j_errno;
1998 const char *errstr;
1999
2000 journal = EXT3_SB(sb)->s_journal;
2001
2002 /*
2003 * Now check for any error status which may have been recorded in the
2004 * journal by a prior ext3_error() or ext3_abort()
2005 */
2006
2007 j_errno = journal_errno(journal);
2008 if (j_errno) {
2009 char nbuf[16];
2010
2011 errstr = ext3_decode_error(sb, j_errno, nbuf);
2012 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2013 "from previous mount: %s", errstr);
2014 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2015 "filesystem check.");
2016
2017 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2018 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2019 ext3_commit_super (sb, es, 1);
2020
2021 journal_clear_err(journal);
2022 }
2023 }
2024
2025 /*
2026 * Force the running and committing transactions to commit,
2027 * and wait on the commit.
2028 */
2029 int ext3_force_commit(struct super_block *sb)
2030 {
2031 journal_t *journal;
2032 int ret;
2033
2034 if (sb->s_flags & MS_RDONLY)
2035 return 0;
2036
2037 journal = EXT3_SB(sb)->s_journal;
2038 sb->s_dirt = 0;
2039 ret = ext3_journal_force_commit(journal);
2040 return ret;
2041 }
2042
2043 /*
2044 * Ext3 always journals updates to the superblock itself, so we don't
2045 * have to propagate any other updates to the superblock on disk at this
2046 * point. Just start an async writeback to get the buffers on their way
2047 * to the disk.
2048 *
2049 * This implicitly triggers the writebehind on sync().
2050 */
2051
2052 static void ext3_write_super (struct super_block * sb)
2053 {
2054 if (down_trylock(&sb->s_lock) == 0)
2055 BUG();
2056 sb->s_dirt = 0;
2057 }
2058
2059 static int ext3_sync_fs(struct super_block *sb, int wait)
2060 {
2061 tid_t target;
2062
2063 sb->s_dirt = 0;
2064 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2065 if (wait)
2066 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2067 }
2068 return 0;
2069 }
2070
2071 /*
2072 * LVM calls this function before a (read-only) snapshot is created. This
2073 * gives us a chance to flush the journal completely and mark the fs clean.
2074 */
2075 static void ext3_write_super_lockfs(struct super_block *sb)
2076 {
2077 sb->s_dirt = 0;
2078
2079 if (!(sb->s_flags & MS_RDONLY)) {
2080 journal_t *journal = EXT3_SB(sb)->s_journal;
2081
2082 /* Now we set up the journal barrier. */
2083 journal_lock_updates(journal);
2084 journal_flush(journal);
2085
2086 /* Journal blocked and flushed, clear needs_recovery flag. */
2087 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2088 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2089 }
2090 }
2091
2092 /*
2093 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2094 * flag here, even though the filesystem is not technically dirty yet.
2095 */
2096 static void ext3_unlockfs(struct super_block *sb)
2097 {
2098 if (!(sb->s_flags & MS_RDONLY)) {
2099 lock_super(sb);
2100 /* Reser the needs_recovery flag before the fs is unlocked. */
2101 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2102 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2103 unlock_super(sb);
2104 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2105 }
2106 }
2107
2108 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2109 {
2110 struct ext3_super_block * es;
2111 struct ext3_sb_info *sbi = EXT3_SB(sb);
2112 unsigned long tmp;
2113 unsigned long n_blocks_count = 0;
2114
2115 /*
2116 * Allow the "check" option to be passed as a remount option.
2117 */
2118 if (!parse_options(data, sb, &tmp, &n_blocks_count, 1))
2119 return -EINVAL;
2120
2121 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2122 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2123
2124 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2125 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2126
2127 es = sbi->s_es;
2128
2129 ext3_init_journal_params(sb, sbi->s_journal);
2130
2131 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2132 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2133 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2134 return -EROFS;
2135
2136 if (*flags & MS_RDONLY) {
2137 /*
2138 * First of all, the unconditional stuff we have to do
2139 * to disable replay of the journal when we next remount
2140 */
2141 sb->s_flags |= MS_RDONLY;
2142
2143 /*
2144 * OK, test if we are remounting a valid rw partition
2145 * readonly, and if so set the rdonly flag and then
2146 * mark the partition as valid again.
2147 */
2148 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2149 (sbi->s_mount_state & EXT3_VALID_FS))
2150 es->s_state = cpu_to_le16(sbi->s_mount_state);
2151
2152 ext3_mark_recovery_complete(sb, es);
2153 } else {
2154 __le32 ret;
2155 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2156 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2157 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2158 "remount RDWR because of unsupported "
2159 "optional features (%x).\n",
2160 sb->s_id, le32_to_cpu(ret));
2161 return -EROFS;
2162 }
2163 /*
2164 * Mounting a RDONLY partition read-write, so reread
2165 * and store the current valid flag. (It may have
2166 * been changed by e2fsck since we originally mounted
2167 * the partition.)
2168 */
2169 ext3_clear_journal_err(sb, es);
2170 sbi->s_mount_state = le16_to_cpu(es->s_state);
2171 if ((ret = ext3_group_extend(sb, es, n_blocks_count)))
2172 return ret;
2173 if (!ext3_setup_super (sb, es, 0))
2174 sb->s_flags &= ~MS_RDONLY;
2175 }
2176 }
2177 return 0;
2178 }
2179
2180 static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
2181 {
2182 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
2183 unsigned long overhead;
2184 int i;
2185
2186 if (test_opt (sb, MINIX_DF))
2187 overhead = 0;
2188 else {
2189 unsigned long ngroups;
2190 ngroups = EXT3_SB(sb)->s_groups_count;
2191 smp_rmb();
2192
2193 /*
2194 * Compute the overhead (FS structures)
2195 */
2196
2197 /*
2198 * All of the blocks before first_data_block are
2199 * overhead
2200 */
2201 overhead = le32_to_cpu(es->s_first_data_block);
2202
2203 /*
2204 * Add the overhead attributed to the superblock and
2205 * block group descriptors. If the sparse superblocks
2206 * feature is turned on, then not all groups have this.
2207 */
2208 for (i = 0; i < ngroups; i++) {
2209 overhead += ext3_bg_has_super(sb, i) +
2210 ext3_bg_num_gdb(sb, i);
2211 cond_resched();
2212 }
2213
2214 /*
2215 * Every block group has an inode bitmap, a block
2216 * bitmap, and an inode table.
2217 */
2218 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2219 }
2220
2221 buf->f_type = EXT3_SUPER_MAGIC;
2222 buf->f_bsize = sb->s_blocksize;
2223 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2224 buf->f_bfree = ext3_count_free_blocks (sb);
2225 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2226 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2227 buf->f_bavail = 0;
2228 buf->f_files = le32_to_cpu(es->s_inodes_count);
2229 buf->f_ffree = ext3_count_free_inodes (sb);
2230 buf->f_namelen = EXT3_NAME_LEN;
2231 return 0;
2232 }
2233
2234 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2235 * is locked for write. Otherwise the are possible deadlocks:
2236 * Process 1 Process 2
2237 * ext3_create() quota_sync()
2238 * journal_start() write_dquot()
2239 * DQUOT_INIT() down(dqio_sem)
2240 * down(dqio_sem) journal_start()
2241 *
2242 */
2243
2244 #ifdef CONFIG_QUOTA
2245
2246 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2247 {
2248 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2249 }
2250
2251 static int ext3_dquot_initialize(struct inode *inode, int type)
2252 {
2253 handle_t *handle;
2254 int ret, err;
2255
2256 /* We may create quota structure so we need to reserve enough blocks */
2257 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2258 if (IS_ERR(handle))
2259 return PTR_ERR(handle);
2260 ret = dquot_initialize(inode, type);
2261 err = ext3_journal_stop(handle);
2262 if (!ret)
2263 ret = err;
2264 return ret;
2265 }
2266
2267 static int ext3_dquot_drop(struct inode *inode)
2268 {
2269 handle_t *handle;
2270 int ret, err;
2271
2272 /* We may delete quota structure so we need to reserve enough blocks */
2273 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2274 if (IS_ERR(handle))
2275 return PTR_ERR(handle);
2276 ret = dquot_drop(inode);
2277 err = ext3_journal_stop(handle);
2278 if (!ret)
2279 ret = err;
2280 return ret;
2281 }
2282
2283 static int ext3_write_dquot(struct dquot *dquot)
2284 {
2285 int ret, err;
2286 handle_t *handle;
2287 struct inode *inode;
2288
2289 inode = dquot_to_inode(dquot);
2290 handle = ext3_journal_start(inode,
2291 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2292 if (IS_ERR(handle))
2293 return PTR_ERR(handle);
2294 ret = dquot_commit(dquot);
2295 err = ext3_journal_stop(handle);
2296 if (!ret)
2297 ret = err;
2298 return ret;
2299 }
2300
2301 static int ext3_acquire_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(dquot->dq_sb));
2308 if (IS_ERR(handle))
2309 return PTR_ERR(handle);
2310 ret = dquot_acquire(dquot);
2311 err = ext3_journal_stop(handle);
2312 if (!ret)
2313 ret = err;
2314 return ret;
2315 }
2316
2317 static int ext3_release_dquot(struct dquot *dquot)
2318 {
2319 int ret, err;
2320 handle_t *handle;
2321
2322 handle = ext3_journal_start(dquot_to_inode(dquot),
2323 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2324 if (IS_ERR(handle))
2325 return PTR_ERR(handle);
2326 ret = dquot_release(dquot);
2327 err = ext3_journal_stop(handle);
2328 if (!ret)
2329 ret = err;
2330 return ret;
2331 }
2332
2333 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2334 {
2335 /* Are we journalling quotas? */
2336 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2337 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2338 dquot_mark_dquot_dirty(dquot);
2339 return ext3_write_dquot(dquot);
2340 } else {
2341 return dquot_mark_dquot_dirty(dquot);
2342 }
2343 }
2344
2345 static int ext3_write_info(struct super_block *sb, int type)
2346 {
2347 int ret, err;
2348 handle_t *handle;
2349
2350 /* Data block + inode block */
2351 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2352 if (IS_ERR(handle))
2353 return PTR_ERR(handle);
2354 ret = dquot_commit_info(sb, type);
2355 err = ext3_journal_stop(handle);
2356 if (!ret)
2357 ret = err;
2358 return ret;
2359 }
2360
2361 /*
2362 * Turn on quotas during mount time - we need to find
2363 * the quota file and such...
2364 */
2365 static int ext3_quota_on_mount(struct super_block *sb, int type)
2366 {
2367 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2368 EXT3_SB(sb)->s_jquota_fmt, type);
2369 }
2370
2371 /*
2372 * Standard function to be called on quota_on
2373 */
2374 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2375 char *path)
2376 {
2377 int err;
2378 struct nameidata nd;
2379
2380 if (!test_opt(sb, QUOTA))
2381 return -EINVAL;
2382 /* Not journalling quota? */
2383 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2384 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2385 return vfs_quota_on(sb, type, format_id, path);
2386 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2387 if (err)
2388 return err;
2389 /* Quotafile not on the same filesystem? */
2390 if (nd.mnt->mnt_sb != sb) {
2391 path_release(&nd);
2392 return -EXDEV;
2393 }
2394 /* Quotafile not of fs root? */
2395 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2396 printk(KERN_WARNING
2397 "EXT3-fs: Quota file not on filesystem root. "
2398 "Journalled quota will not work.\n");
2399 path_release(&nd);
2400 return vfs_quota_on(sb, type, format_id, path);
2401 }
2402
2403 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2404 * acquiring the locks... As quota files are never truncated and quota code
2405 * itself serializes the operations (and noone else should touch the files)
2406 * we don't have to be afraid of races */
2407 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2408 size_t len, loff_t off)
2409 {
2410 struct inode *inode = sb_dqopt(sb)->files[type];
2411 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2412 int err = 0;
2413 int offset = off & (sb->s_blocksize - 1);
2414 int tocopy;
2415 size_t toread;
2416 struct buffer_head *bh;
2417 loff_t i_size = i_size_read(inode);
2418
2419 if (off > i_size)
2420 return 0;
2421 if (off+len > i_size)
2422 len = i_size-off;
2423 toread = len;
2424 while (toread > 0) {
2425 tocopy = sb->s_blocksize - offset < toread ?
2426 sb->s_blocksize - offset : toread;
2427 bh = ext3_bread(NULL, inode, blk, 0, &err);
2428 if (err)
2429 return err;
2430 if (!bh) /* A hole? */
2431 memset(data, 0, tocopy);
2432 else
2433 memcpy(data, bh->b_data+offset, tocopy);
2434 brelse(bh);
2435 offset = 0;
2436 toread -= tocopy;
2437 data += tocopy;
2438 blk++;
2439 }
2440 return len;
2441 }
2442
2443 /* Write to quotafile (we know the transaction is already started and has
2444 * enough credits) */
2445 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2446 const char *data, size_t len, loff_t off)
2447 {
2448 struct inode *inode = sb_dqopt(sb)->files[type];
2449 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2450 int err = 0;
2451 int offset = off & (sb->s_blocksize - 1);
2452 int tocopy;
2453 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2454 size_t towrite = len;
2455 struct buffer_head *bh;
2456 handle_t *handle = journal_current_handle();
2457
2458 down(&inode->i_sem);
2459 while (towrite > 0) {
2460 tocopy = sb->s_blocksize - offset < towrite ?
2461 sb->s_blocksize - offset : towrite;
2462 bh = ext3_bread(handle, inode, blk, 1, &err);
2463 if (!bh)
2464 goto out;
2465 if (journal_quota) {
2466 err = ext3_journal_get_write_access(handle, bh);
2467 if (err) {
2468 brelse(bh);
2469 goto out;
2470 }
2471 }
2472 lock_buffer(bh);
2473 memcpy(bh->b_data+offset, data, tocopy);
2474 flush_dcache_page(bh->b_page);
2475 unlock_buffer(bh);
2476 if (journal_quota)
2477 err = ext3_journal_dirty_metadata(handle, bh);
2478 else {
2479 /* Always do at least ordered writes for quotas */
2480 err = ext3_journal_dirty_data(handle, bh);
2481 mark_buffer_dirty(bh);
2482 }
2483 brelse(bh);
2484 if (err)
2485 goto out;
2486 offset = 0;
2487 towrite -= tocopy;
2488 data += tocopy;
2489 blk++;
2490 }
2491 out:
2492 if (len == towrite)
2493 return err;
2494 if (inode->i_size < off+len-towrite) {
2495 i_size_write(inode, off+len-towrite);
2496 EXT3_I(inode)->i_disksize = inode->i_size;
2497 }
2498 inode->i_version++;
2499 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2500 ext3_mark_inode_dirty(handle, inode);
2501 up(&inode->i_sem);
2502 return len - towrite;
2503 }
2504
2505 #endif
2506
2507 static struct super_block *ext3_get_sb(struct file_system_type *fs_type,
2508 int flags, const char *dev_name, void *data)
2509 {
2510 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
2511 }
2512
2513 static struct file_system_type ext3_fs_type = {
2514 .owner = THIS_MODULE,
2515 .name = "ext3",
2516 .get_sb = ext3_get_sb,
2517 .kill_sb = kill_block_super,
2518 .fs_flags = FS_REQUIRES_DEV,
2519 };
2520
2521 static int __init init_ext3_fs(void)
2522 {
2523 int err = init_ext3_xattr();
2524 if (err)
2525 return err;
2526 err = init_inodecache();
2527 if (err)
2528 goto out1;
2529 err = register_filesystem(&ext3_fs_type);
2530 if (err)
2531 goto out;
2532 return 0;
2533 out:
2534 destroy_inodecache();
2535 out1:
2536 exit_ext3_xattr();
2537 return err;
2538 }
2539
2540 static void __exit exit_ext3_fs(void)
2541 {
2542 unregister_filesystem(&ext3_fs_type);
2543 destroy_inodecache();
2544 exit_ext3_xattr();
2545 }
2546
2547 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2548 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2549 MODULE_LICENSE("GPL");
2550 module_init(init_ext3_fs)
2551 module_exit(exit_ext3_fs)
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