reiserfs: fixup xattr_root caching
[linux-2.6.git] / fs / ext3 / super.c
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/module.h>
20 #include <linux/string.h>
21 #include <linux/fs.h>
22 #include <linux/time.h>
23 #include <linux/jbd.h>
24 #include <linux/ext3_fs.h>
25 #include <linux/ext3_jbd.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/blkdev.h>
29 #include <linux/parser.h>
30 #include <linux/smp_lock.h>
31 #include <linux/buffer_head.h>
32 #include <linux/exportfs.h>
33 #include <linux/vfs.h>
34 #include <linux/random.h>
35 #include <linux/mount.h>
36 #include <linux/namei.h>
37 #include <linux/quotaops.h>
38 #include <linux/seq_file.h>
39 #include <linux/log2.h>
40
41 #include <asm/uaccess.h>
42
43 #include "xattr.h"
44 #include "acl.h"
45 #include "namei.h"
46
47 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
48   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
49 #else
50   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
51 #endif
52
53 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
54                              unsigned long journal_devnum);
55 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
56                                unsigned int);
57 static int ext3_commit_super(struct super_block *sb,
58                                struct ext3_super_block *es,
59                                int sync);
60 static void ext3_mark_recovery_complete(struct super_block * sb,
61                                         struct ext3_super_block * es);
62 static void ext3_clear_journal_err(struct super_block * sb,
63                                    struct ext3_super_block * es);
64 static int ext3_sync_fs(struct super_block *sb, int wait);
65 static const char *ext3_decode_error(struct super_block * sb, int errno,
66                                      char nbuf[16]);
67 static int ext3_remount (struct super_block * sb, int * flags, char * data);
68 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
69 static int ext3_unfreeze(struct super_block *sb);
70 static void ext3_write_super (struct super_block * sb);
71 static int ext3_freeze(struct super_block *sb);
72
73 /*
74  * Wrappers for journal_start/end.
75  *
76  * The only special thing we need to do here is to make sure that all
77  * journal_end calls result in the superblock being marked dirty, so
78  * that sync() will call the filesystem's write_super callback if
79  * appropriate.
80  */
81 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
82 {
83         journal_t *journal;
84
85         if (sb->s_flags & MS_RDONLY)
86                 return ERR_PTR(-EROFS);
87
88         /* Special case here: if the journal has aborted behind our
89          * backs (eg. EIO in the commit thread), then we still need to
90          * take the FS itself readonly cleanly. */
91         journal = EXT3_SB(sb)->s_journal;
92         if (is_journal_aborted(journal)) {
93                 ext3_abort(sb, __func__,
94                            "Detected aborted journal");
95                 return ERR_PTR(-EROFS);
96         }
97
98         return journal_start(journal, nblocks);
99 }
100
101 /*
102  * The only special thing we need to do here is to make sure that all
103  * journal_stop calls result in the superblock being marked dirty, so
104  * that sync() will call the filesystem's write_super callback if
105  * appropriate.
106  */
107 int __ext3_journal_stop(const char *where, handle_t *handle)
108 {
109         struct super_block *sb;
110         int err;
111         int rc;
112
113         sb = handle->h_transaction->t_journal->j_private;
114         err = handle->h_err;
115         rc = journal_stop(handle);
116
117         if (!err)
118                 err = rc;
119         if (err)
120                 __ext3_std_error(sb, where, err);
121         return err;
122 }
123
124 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
125                 struct buffer_head *bh, handle_t *handle, int err)
126 {
127         char nbuf[16];
128         const char *errstr = ext3_decode_error(NULL, err, nbuf);
129
130         if (bh)
131                 BUFFER_TRACE(bh, "abort");
132
133         if (!handle->h_err)
134                 handle->h_err = err;
135
136         if (is_handle_aborted(handle))
137                 return;
138
139         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
140                caller, errstr, err_fn);
141
142         journal_abort_handle(handle);
143 }
144
145 /* Deal with the reporting of failure conditions on a filesystem such as
146  * inconsistencies detected or read IO failures.
147  *
148  * On ext2, we can store the error state of the filesystem in the
149  * superblock.  That is not possible on ext3, because we may have other
150  * write ordering constraints on the superblock which prevent us from
151  * writing it out straight away; and given that the journal is about to
152  * be aborted, we can't rely on the current, or future, transactions to
153  * write out the superblock safely.
154  *
155  * We'll just use the journal_abort() error code to record an error in
156  * the journal instead.  On recovery, the journal will compain about
157  * that error until we've noted it down and cleared it.
158  */
159
160 static void ext3_handle_error(struct super_block *sb)
161 {
162         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
163
164         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
165         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
166
167         if (sb->s_flags & MS_RDONLY)
168                 return;
169
170         if (!test_opt (sb, ERRORS_CONT)) {
171                 journal_t *journal = EXT3_SB(sb)->s_journal;
172
173                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
174                 if (journal)
175                         journal_abort(journal, -EIO);
176         }
177         if (test_opt (sb, ERRORS_RO)) {
178                 printk (KERN_CRIT "Remounting filesystem read-only\n");
179                 sb->s_flags |= MS_RDONLY;
180         }
181         ext3_commit_super(sb, es, 1);
182         if (test_opt(sb, ERRORS_PANIC))
183                 panic("EXT3-fs (device %s): panic forced after error\n",
184                         sb->s_id);
185 }
186
187 void ext3_error (struct super_block * sb, const char * function,
188                  const char * fmt, ...)
189 {
190         va_list args;
191
192         va_start(args, fmt);
193         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
194         vprintk(fmt, args);
195         printk("\n");
196         va_end(args);
197
198         ext3_handle_error(sb);
199 }
200
201 static const char *ext3_decode_error(struct super_block * sb, int errno,
202                                      char nbuf[16])
203 {
204         char *errstr = NULL;
205
206         switch (errno) {
207         case -EIO:
208                 errstr = "IO failure";
209                 break;
210         case -ENOMEM:
211                 errstr = "Out of memory";
212                 break;
213         case -EROFS:
214                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
215                         errstr = "Journal has aborted";
216                 else
217                         errstr = "Readonly filesystem";
218                 break;
219         default:
220                 /* If the caller passed in an extra buffer for unknown
221                  * errors, textualise them now.  Else we just return
222                  * NULL. */
223                 if (nbuf) {
224                         /* Check for truncated error codes... */
225                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
226                                 errstr = nbuf;
227                 }
228                 break;
229         }
230
231         return errstr;
232 }
233
234 /* __ext3_std_error decodes expected errors from journaling functions
235  * automatically and invokes the appropriate error response.  */
236
237 void __ext3_std_error (struct super_block * sb, const char * function,
238                        int errno)
239 {
240         char nbuf[16];
241         const char *errstr;
242
243         /* Special case: if the error is EROFS, and we're not already
244          * inside a transaction, then there's really no point in logging
245          * an error. */
246         if (errno == -EROFS && journal_current_handle() == NULL &&
247             (sb->s_flags & MS_RDONLY))
248                 return;
249
250         errstr = ext3_decode_error(sb, errno, nbuf);
251         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
252                 sb->s_id, function, errstr);
253
254         ext3_handle_error(sb);
255 }
256
257 /*
258  * ext3_abort is a much stronger failure handler than ext3_error.  The
259  * abort function may be used to deal with unrecoverable failures such
260  * as journal IO errors or ENOMEM at a critical moment in log management.
261  *
262  * We unconditionally force the filesystem into an ABORT|READONLY state,
263  * unless the error response on the fs has been set to panic in which
264  * case we take the easy way out and panic immediately.
265  */
266
267 void ext3_abort (struct super_block * sb, const char * function,
268                  const char * fmt, ...)
269 {
270         va_list args;
271
272         printk (KERN_CRIT "ext3_abort called.\n");
273
274         va_start(args, fmt);
275         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
276         vprintk(fmt, args);
277         printk("\n");
278         va_end(args);
279
280         if (test_opt(sb, ERRORS_PANIC))
281                 panic("EXT3-fs panic from previous error\n");
282
283         if (sb->s_flags & MS_RDONLY)
284                 return;
285
286         printk(KERN_CRIT "Remounting filesystem read-only\n");
287         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
288         sb->s_flags |= MS_RDONLY;
289         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
290         if (EXT3_SB(sb)->s_journal)
291                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
292 }
293
294 void ext3_warning (struct super_block * sb, const char * function,
295                    const char * fmt, ...)
296 {
297         va_list args;
298
299         va_start(args, fmt);
300         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
301                sb->s_id, function);
302         vprintk(fmt, args);
303         printk("\n");
304         va_end(args);
305 }
306
307 void ext3_update_dynamic_rev(struct super_block *sb)
308 {
309         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
310
311         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
312                 return;
313
314         ext3_warning(sb, __func__,
315                      "updating to rev %d because of new feature flag, "
316                      "running e2fsck is recommended",
317                      EXT3_DYNAMIC_REV);
318
319         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
320         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
321         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
322         /* leave es->s_feature_*compat flags alone */
323         /* es->s_uuid will be set by e2fsck if empty */
324
325         /*
326          * The rest of the superblock fields should be zero, and if not it
327          * means they are likely already in use, so leave them alone.  We
328          * can leave it up to e2fsck to clean up any inconsistencies there.
329          */
330 }
331
332 /*
333  * Open the external journal device
334  */
335 static struct block_device *ext3_blkdev_get(dev_t dev)
336 {
337         struct block_device *bdev;
338         char b[BDEVNAME_SIZE];
339
340         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
341         if (IS_ERR(bdev))
342                 goto fail;
343         return bdev;
344
345 fail:
346         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
347                         __bdevname(dev, b), PTR_ERR(bdev));
348         return NULL;
349 }
350
351 /*
352  * Release the journal device
353  */
354 static int ext3_blkdev_put(struct block_device *bdev)
355 {
356         bd_release(bdev);
357         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
358 }
359
360 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
361 {
362         struct block_device *bdev;
363         int ret = -ENODEV;
364
365         bdev = sbi->journal_bdev;
366         if (bdev) {
367                 ret = ext3_blkdev_put(bdev);
368                 sbi->journal_bdev = NULL;
369         }
370         return ret;
371 }
372
373 static inline struct inode *orphan_list_entry(struct list_head *l)
374 {
375         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
376 }
377
378 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
379 {
380         struct list_head *l;
381
382         printk(KERN_ERR "sb orphan head is %d\n",
383                le32_to_cpu(sbi->s_es->s_last_orphan));
384
385         printk(KERN_ERR "sb_info orphan list:\n");
386         list_for_each(l, &sbi->s_orphan) {
387                 struct inode *inode = orphan_list_entry(l);
388                 printk(KERN_ERR "  "
389                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
390                        inode->i_sb->s_id, inode->i_ino, inode,
391                        inode->i_mode, inode->i_nlink,
392                        NEXT_ORPHAN(inode));
393         }
394 }
395
396 static void ext3_put_super (struct super_block * sb)
397 {
398         struct ext3_sb_info *sbi = EXT3_SB(sb);
399         struct ext3_super_block *es = sbi->s_es;
400         int i, err;
401
402         ext3_xattr_put_super(sb);
403         err = journal_destroy(sbi->s_journal);
404         sbi->s_journal = NULL;
405         if (err < 0)
406                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
407
408         if (!(sb->s_flags & MS_RDONLY)) {
409                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
410                 es->s_state = cpu_to_le16(sbi->s_mount_state);
411                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
412                 mark_buffer_dirty(sbi->s_sbh);
413                 ext3_commit_super(sb, es, 1);
414         }
415
416         for (i = 0; i < sbi->s_gdb_count; i++)
417                 brelse(sbi->s_group_desc[i]);
418         kfree(sbi->s_group_desc);
419         percpu_counter_destroy(&sbi->s_freeblocks_counter);
420         percpu_counter_destroy(&sbi->s_freeinodes_counter);
421         percpu_counter_destroy(&sbi->s_dirs_counter);
422         brelse(sbi->s_sbh);
423 #ifdef CONFIG_QUOTA
424         for (i = 0; i < MAXQUOTAS; i++)
425                 kfree(sbi->s_qf_names[i]);
426 #endif
427
428         /* Debugging code just in case the in-memory inode orphan list
429          * isn't empty.  The on-disk one can be non-empty if we've
430          * detected an error and taken the fs readonly, but the
431          * in-memory list had better be clean by this point. */
432         if (!list_empty(&sbi->s_orphan))
433                 dump_orphan_list(sb, sbi);
434         J_ASSERT(list_empty(&sbi->s_orphan));
435
436         invalidate_bdev(sb->s_bdev);
437         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
438                 /*
439                  * Invalidate the journal device's buffers.  We don't want them
440                  * floating about in memory - the physical journal device may
441                  * hotswapped, and it breaks the `ro-after' testing code.
442                  */
443                 sync_blockdev(sbi->journal_bdev);
444                 invalidate_bdev(sbi->journal_bdev);
445                 ext3_blkdev_remove(sbi);
446         }
447         sb->s_fs_info = NULL;
448         kfree(sbi->s_blockgroup_lock);
449         kfree(sbi);
450         return;
451 }
452
453 static struct kmem_cache *ext3_inode_cachep;
454
455 /*
456  * Called inside transaction, so use GFP_NOFS
457  */
458 static struct inode *ext3_alloc_inode(struct super_block *sb)
459 {
460         struct ext3_inode_info *ei;
461
462         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
463         if (!ei)
464                 return NULL;
465 #ifdef CONFIG_EXT3_FS_POSIX_ACL
466         ei->i_acl = EXT3_ACL_NOT_CACHED;
467         ei->i_default_acl = EXT3_ACL_NOT_CACHED;
468 #endif
469         ei->i_block_alloc_info = NULL;
470         ei->vfs_inode.i_version = 1;
471         return &ei->vfs_inode;
472 }
473
474 static void ext3_destroy_inode(struct inode *inode)
475 {
476         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
477                 printk("EXT3 Inode %p: orphan list check failed!\n",
478                         EXT3_I(inode));
479                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
480                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
481                                 false);
482                 dump_stack();
483         }
484         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
485 }
486
487 static void init_once(void *foo)
488 {
489         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
490
491         INIT_LIST_HEAD(&ei->i_orphan);
492 #ifdef CONFIG_EXT3_FS_XATTR
493         init_rwsem(&ei->xattr_sem);
494 #endif
495         mutex_init(&ei->truncate_mutex);
496         inode_init_once(&ei->vfs_inode);
497 }
498
499 static int init_inodecache(void)
500 {
501         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
502                                              sizeof(struct ext3_inode_info),
503                                              0, (SLAB_RECLAIM_ACCOUNT|
504                                                 SLAB_MEM_SPREAD),
505                                              init_once);
506         if (ext3_inode_cachep == NULL)
507                 return -ENOMEM;
508         return 0;
509 }
510
511 static void destroy_inodecache(void)
512 {
513         kmem_cache_destroy(ext3_inode_cachep);
514 }
515
516 static void ext3_clear_inode(struct inode *inode)
517 {
518         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
519 #ifdef CONFIG_EXT3_FS_POSIX_ACL
520         if (EXT3_I(inode)->i_acl &&
521                         EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
522                 posix_acl_release(EXT3_I(inode)->i_acl);
523                 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
524         }
525         if (EXT3_I(inode)->i_default_acl &&
526                         EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
527                 posix_acl_release(EXT3_I(inode)->i_default_acl);
528                 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
529         }
530 #endif
531         ext3_discard_reservation(inode);
532         EXT3_I(inode)->i_block_alloc_info = NULL;
533         if (unlikely(rsv))
534                 kfree(rsv);
535 }
536
537 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
538 {
539 #if defined(CONFIG_QUOTA)
540         struct ext3_sb_info *sbi = EXT3_SB(sb);
541
542         if (sbi->s_jquota_fmt)
543                 seq_printf(seq, ",jqfmt=%s",
544                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
545
546         if (sbi->s_qf_names[USRQUOTA])
547                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
548
549         if (sbi->s_qf_names[GRPQUOTA])
550                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
551
552         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
553                 seq_puts(seq, ",usrquota");
554
555         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
556                 seq_puts(seq, ",grpquota");
557 #endif
558 }
559
560 /*
561  * Show an option if
562  *  - it's set to a non-default value OR
563  *  - if the per-sb default is different from the global default
564  */
565 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
566 {
567         struct super_block *sb = vfs->mnt_sb;
568         struct ext3_sb_info *sbi = EXT3_SB(sb);
569         struct ext3_super_block *es = sbi->s_es;
570         unsigned long def_mount_opts;
571
572         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
573
574         if (sbi->s_sb_block != 1)
575                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
576         if (test_opt(sb, MINIX_DF))
577                 seq_puts(seq, ",minixdf");
578         if (test_opt(sb, GRPID))
579                 seq_puts(seq, ",grpid");
580         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
581                 seq_puts(seq, ",nogrpid");
582         if (sbi->s_resuid != EXT3_DEF_RESUID ||
583             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
584                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
585         }
586         if (sbi->s_resgid != EXT3_DEF_RESGID ||
587             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
588                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
589         }
590         if (test_opt(sb, ERRORS_RO)) {
591                 int def_errors = le16_to_cpu(es->s_errors);
592
593                 if (def_errors == EXT3_ERRORS_PANIC ||
594                     def_errors == EXT3_ERRORS_CONTINUE) {
595                         seq_puts(seq, ",errors=remount-ro");
596                 }
597         }
598         if (test_opt(sb, ERRORS_CONT))
599                 seq_puts(seq, ",errors=continue");
600         if (test_opt(sb, ERRORS_PANIC))
601                 seq_puts(seq, ",errors=panic");
602         if (test_opt(sb, NO_UID32))
603                 seq_puts(seq, ",nouid32");
604         if (test_opt(sb, DEBUG))
605                 seq_puts(seq, ",debug");
606         if (test_opt(sb, OLDALLOC))
607                 seq_puts(seq, ",oldalloc");
608 #ifdef CONFIG_EXT3_FS_XATTR
609         if (test_opt(sb, XATTR_USER))
610                 seq_puts(seq, ",user_xattr");
611         if (!test_opt(sb, XATTR_USER) &&
612             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
613                 seq_puts(seq, ",nouser_xattr");
614         }
615 #endif
616 #ifdef CONFIG_EXT3_FS_POSIX_ACL
617         if (test_opt(sb, POSIX_ACL))
618                 seq_puts(seq, ",acl");
619         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
620                 seq_puts(seq, ",noacl");
621 #endif
622         if (!test_opt(sb, RESERVATION))
623                 seq_puts(seq, ",noreservation");
624         if (sbi->s_commit_interval) {
625                 seq_printf(seq, ",commit=%u",
626                            (unsigned) (sbi->s_commit_interval / HZ));
627         }
628         if (test_opt(sb, BARRIER))
629                 seq_puts(seq, ",barrier=1");
630         if (test_opt(sb, NOBH))
631                 seq_puts(seq, ",nobh");
632
633         if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
634                 seq_puts(seq, ",data=journal");
635         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
636                 seq_puts(seq, ",data=ordered");
637         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
638                 seq_puts(seq, ",data=writeback");
639
640         if (test_opt(sb, DATA_ERR_ABORT))
641                 seq_puts(seq, ",data_err=abort");
642
643         ext3_show_quota_options(seq, sb);
644
645         return 0;
646 }
647
648
649 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
650                 u64 ino, u32 generation)
651 {
652         struct inode *inode;
653
654         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
655                 return ERR_PTR(-ESTALE);
656         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
657                 return ERR_PTR(-ESTALE);
658
659         /* iget isn't really right if the inode is currently unallocated!!
660          *
661          * ext3_read_inode will return a bad_inode if the inode had been
662          * deleted, so we should be safe.
663          *
664          * Currently we don't know the generation for parent directory, so
665          * a generation of 0 means "accept any"
666          */
667         inode = ext3_iget(sb, ino);
668         if (IS_ERR(inode))
669                 return ERR_CAST(inode);
670         if (generation && inode->i_generation != generation) {
671                 iput(inode);
672                 return ERR_PTR(-ESTALE);
673         }
674
675         return inode;
676 }
677
678 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
679                 int fh_len, int fh_type)
680 {
681         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
682                                     ext3_nfs_get_inode);
683 }
684
685 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
686                 int fh_len, int fh_type)
687 {
688         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
689                                     ext3_nfs_get_inode);
690 }
691
692 /*
693  * Try to release metadata pages (indirect blocks, directories) which are
694  * mapped via the block device.  Since these pages could have journal heads
695  * which would prevent try_to_free_buffers() from freeing them, we must use
696  * jbd layer's try_to_free_buffers() function to release them.
697  */
698 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
699                                  gfp_t wait)
700 {
701         journal_t *journal = EXT3_SB(sb)->s_journal;
702
703         WARN_ON(PageChecked(page));
704         if (!page_has_buffers(page))
705                 return 0;
706         if (journal)
707                 return journal_try_to_free_buffers(journal, page, 
708                                                    wait & ~__GFP_WAIT);
709         return try_to_free_buffers(page);
710 }
711
712 #ifdef CONFIG_QUOTA
713 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
714 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
715
716 static int ext3_write_dquot(struct dquot *dquot);
717 static int ext3_acquire_dquot(struct dquot *dquot);
718 static int ext3_release_dquot(struct dquot *dquot);
719 static int ext3_mark_dquot_dirty(struct dquot *dquot);
720 static int ext3_write_info(struct super_block *sb, int type);
721 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
722                                 char *path, int remount);
723 static int ext3_quota_on_mount(struct super_block *sb, int type);
724 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
725                                size_t len, loff_t off);
726 static ssize_t ext3_quota_write(struct super_block *sb, int type,
727                                 const char *data, size_t len, loff_t off);
728
729 static struct dquot_operations ext3_quota_operations = {
730         .initialize     = dquot_initialize,
731         .drop           = dquot_drop,
732         .alloc_space    = dquot_alloc_space,
733         .alloc_inode    = dquot_alloc_inode,
734         .free_space     = dquot_free_space,
735         .free_inode     = dquot_free_inode,
736         .transfer       = dquot_transfer,
737         .write_dquot    = ext3_write_dquot,
738         .acquire_dquot  = ext3_acquire_dquot,
739         .release_dquot  = ext3_release_dquot,
740         .mark_dirty     = ext3_mark_dquot_dirty,
741         .write_info     = ext3_write_info,
742         .alloc_dquot    = dquot_alloc,
743         .destroy_dquot  = dquot_destroy,
744 };
745
746 static struct quotactl_ops ext3_qctl_operations = {
747         .quota_on       = ext3_quota_on,
748         .quota_off      = vfs_quota_off,
749         .quota_sync     = vfs_quota_sync,
750         .get_info       = vfs_get_dqinfo,
751         .set_info       = vfs_set_dqinfo,
752         .get_dqblk      = vfs_get_dqblk,
753         .set_dqblk      = vfs_set_dqblk
754 };
755 #endif
756
757 static const struct super_operations ext3_sops = {
758         .alloc_inode    = ext3_alloc_inode,
759         .destroy_inode  = ext3_destroy_inode,
760         .write_inode    = ext3_write_inode,
761         .dirty_inode    = ext3_dirty_inode,
762         .delete_inode   = ext3_delete_inode,
763         .put_super      = ext3_put_super,
764         .write_super    = ext3_write_super,
765         .sync_fs        = ext3_sync_fs,
766         .freeze_fs      = ext3_freeze,
767         .unfreeze_fs    = ext3_unfreeze,
768         .statfs         = ext3_statfs,
769         .remount_fs     = ext3_remount,
770         .clear_inode    = ext3_clear_inode,
771         .show_options   = ext3_show_options,
772 #ifdef CONFIG_QUOTA
773         .quota_read     = ext3_quota_read,
774         .quota_write    = ext3_quota_write,
775 #endif
776         .bdev_try_to_free_page = bdev_try_to_free_page,
777 };
778
779 static const struct export_operations ext3_export_ops = {
780         .fh_to_dentry = ext3_fh_to_dentry,
781         .fh_to_parent = ext3_fh_to_parent,
782         .get_parent = ext3_get_parent,
783 };
784
785 enum {
786         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
787         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
788         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
789         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
790         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
791         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
792         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
793         Opt_data_err_abort, Opt_data_err_ignore,
794         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
795         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
796         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
797         Opt_grpquota
798 };
799
800 static const match_table_t tokens = {
801         {Opt_bsd_df, "bsddf"},
802         {Opt_minix_df, "minixdf"},
803         {Opt_grpid, "grpid"},
804         {Opt_grpid, "bsdgroups"},
805         {Opt_nogrpid, "nogrpid"},
806         {Opt_nogrpid, "sysvgroups"},
807         {Opt_resgid, "resgid=%u"},
808         {Opt_resuid, "resuid=%u"},
809         {Opt_sb, "sb=%u"},
810         {Opt_err_cont, "errors=continue"},
811         {Opt_err_panic, "errors=panic"},
812         {Opt_err_ro, "errors=remount-ro"},
813         {Opt_nouid32, "nouid32"},
814         {Opt_nocheck, "nocheck"},
815         {Opt_nocheck, "check=none"},
816         {Opt_debug, "debug"},
817         {Opt_oldalloc, "oldalloc"},
818         {Opt_orlov, "orlov"},
819         {Opt_user_xattr, "user_xattr"},
820         {Opt_nouser_xattr, "nouser_xattr"},
821         {Opt_acl, "acl"},
822         {Opt_noacl, "noacl"},
823         {Opt_reservation, "reservation"},
824         {Opt_noreservation, "noreservation"},
825         {Opt_noload, "noload"},
826         {Opt_nobh, "nobh"},
827         {Opt_bh, "bh"},
828         {Opt_commit, "commit=%u"},
829         {Opt_journal_update, "journal=update"},
830         {Opt_journal_inum, "journal=%u"},
831         {Opt_journal_dev, "journal_dev=%u"},
832         {Opt_abort, "abort"},
833         {Opt_data_journal, "data=journal"},
834         {Opt_data_ordered, "data=ordered"},
835         {Opt_data_writeback, "data=writeback"},
836         {Opt_data_err_abort, "data_err=abort"},
837         {Opt_data_err_ignore, "data_err=ignore"},
838         {Opt_offusrjquota, "usrjquota="},
839         {Opt_usrjquota, "usrjquota=%s"},
840         {Opt_offgrpjquota, "grpjquota="},
841         {Opt_grpjquota, "grpjquota=%s"},
842         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
843         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
844         {Opt_grpquota, "grpquota"},
845         {Opt_noquota, "noquota"},
846         {Opt_quota, "quota"},
847         {Opt_usrquota, "usrquota"},
848         {Opt_barrier, "barrier=%u"},
849         {Opt_resize, "resize"},
850         {Opt_err, NULL},
851 };
852
853 static ext3_fsblk_t get_sb_block(void **data)
854 {
855         ext3_fsblk_t    sb_block;
856         char            *options = (char *) *data;
857
858         if (!options || strncmp(options, "sb=", 3) != 0)
859                 return 1;       /* Default location */
860         options += 3;
861         /*todo: use simple_strtoll with >32bit ext3 */
862         sb_block = simple_strtoul(options, &options, 0);
863         if (*options && *options != ',') {
864                 printk("EXT3-fs: Invalid sb specification: %s\n",
865                        (char *) *data);
866                 return 1;
867         }
868         if (*options == ',')
869                 options++;
870         *data = (void *) options;
871         return sb_block;
872 }
873
874 static int parse_options (char *options, struct super_block *sb,
875                           unsigned int *inum, unsigned long *journal_devnum,
876                           ext3_fsblk_t *n_blocks_count, int is_remount)
877 {
878         struct ext3_sb_info *sbi = EXT3_SB(sb);
879         char * p;
880         substring_t args[MAX_OPT_ARGS];
881         int data_opt = 0;
882         int option;
883 #ifdef CONFIG_QUOTA
884         int qtype, qfmt;
885         char *qname;
886 #endif
887
888         if (!options)
889                 return 1;
890
891         while ((p = strsep (&options, ",")) != NULL) {
892                 int token;
893                 if (!*p)
894                         continue;
895
896                 token = match_token(p, tokens, args);
897                 switch (token) {
898                 case Opt_bsd_df:
899                         clear_opt (sbi->s_mount_opt, MINIX_DF);
900                         break;
901                 case Opt_minix_df:
902                         set_opt (sbi->s_mount_opt, MINIX_DF);
903                         break;
904                 case Opt_grpid:
905                         set_opt (sbi->s_mount_opt, GRPID);
906                         break;
907                 case Opt_nogrpid:
908                         clear_opt (sbi->s_mount_opt, GRPID);
909                         break;
910                 case Opt_resuid:
911                         if (match_int(&args[0], &option))
912                                 return 0;
913                         sbi->s_resuid = option;
914                         break;
915                 case Opt_resgid:
916                         if (match_int(&args[0], &option))
917                                 return 0;
918                         sbi->s_resgid = option;
919                         break;
920                 case Opt_sb:
921                         /* handled by get_sb_block() instead of here */
922                         /* *sb_block = match_int(&args[0]); */
923                         break;
924                 case Opt_err_panic:
925                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
926                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
927                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
928                         break;
929                 case Opt_err_ro:
930                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
931                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
932                         set_opt (sbi->s_mount_opt, ERRORS_RO);
933                         break;
934                 case Opt_err_cont:
935                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
936                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
937                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
938                         break;
939                 case Opt_nouid32:
940                         set_opt (sbi->s_mount_opt, NO_UID32);
941                         break;
942                 case Opt_nocheck:
943                         clear_opt (sbi->s_mount_opt, CHECK);
944                         break;
945                 case Opt_debug:
946                         set_opt (sbi->s_mount_opt, DEBUG);
947                         break;
948                 case Opt_oldalloc:
949                         set_opt (sbi->s_mount_opt, OLDALLOC);
950                         break;
951                 case Opt_orlov:
952                         clear_opt (sbi->s_mount_opt, OLDALLOC);
953                         break;
954 #ifdef CONFIG_EXT3_FS_XATTR
955                 case Opt_user_xattr:
956                         set_opt (sbi->s_mount_opt, XATTR_USER);
957                         break;
958                 case Opt_nouser_xattr:
959                         clear_opt (sbi->s_mount_opt, XATTR_USER);
960                         break;
961 #else
962                 case Opt_user_xattr:
963                 case Opt_nouser_xattr:
964                         printk("EXT3 (no)user_xattr options not supported\n");
965                         break;
966 #endif
967 #ifdef CONFIG_EXT3_FS_POSIX_ACL
968                 case Opt_acl:
969                         set_opt(sbi->s_mount_opt, POSIX_ACL);
970                         break;
971                 case Opt_noacl:
972                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
973                         break;
974 #else
975                 case Opt_acl:
976                 case Opt_noacl:
977                         printk("EXT3 (no)acl options not supported\n");
978                         break;
979 #endif
980                 case Opt_reservation:
981                         set_opt(sbi->s_mount_opt, RESERVATION);
982                         break;
983                 case Opt_noreservation:
984                         clear_opt(sbi->s_mount_opt, RESERVATION);
985                         break;
986                 case Opt_journal_update:
987                         /* @@@ FIXME */
988                         /* Eventually we will want to be able to create
989                            a journal file here.  For now, only allow the
990                            user to specify an existing inode to be the
991                            journal file. */
992                         if (is_remount) {
993                                 printk(KERN_ERR "EXT3-fs: cannot specify "
994                                        "journal on remount\n");
995                                 return 0;
996                         }
997                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
998                         break;
999                 case Opt_journal_inum:
1000                         if (is_remount) {
1001                                 printk(KERN_ERR "EXT3-fs: cannot specify "
1002                                        "journal on remount\n");
1003                                 return 0;
1004                         }
1005                         if (match_int(&args[0], &option))
1006                                 return 0;
1007                         *inum = option;
1008                         break;
1009                 case Opt_journal_dev:
1010                         if (is_remount) {
1011                                 printk(KERN_ERR "EXT3-fs: cannot specify "
1012                                        "journal on remount\n");
1013                                 return 0;
1014                         }
1015                         if (match_int(&args[0], &option))
1016                                 return 0;
1017                         *journal_devnum = option;
1018                         break;
1019                 case Opt_noload:
1020                         set_opt (sbi->s_mount_opt, NOLOAD);
1021                         break;
1022                 case Opt_commit:
1023                         if (match_int(&args[0], &option))
1024                                 return 0;
1025                         if (option < 0)
1026                                 return 0;
1027                         if (option == 0)
1028                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1029                         sbi->s_commit_interval = HZ * option;
1030                         break;
1031                 case Opt_data_journal:
1032                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1033                         goto datacheck;
1034                 case Opt_data_ordered:
1035                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1036                         goto datacheck;
1037                 case Opt_data_writeback:
1038                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1039                 datacheck:
1040                         if (is_remount) {
1041                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1042                                                 != data_opt) {
1043                                         printk(KERN_ERR
1044                                                 "EXT3-fs: cannot change data "
1045                                                 "mode on remount\n");
1046                                         return 0;
1047                                 }
1048                         } else {
1049                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1050                                 sbi->s_mount_opt |= data_opt;
1051                         }
1052                         break;
1053                 case Opt_data_err_abort:
1054                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1055                         break;
1056                 case Opt_data_err_ignore:
1057                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1058                         break;
1059 #ifdef CONFIG_QUOTA
1060                 case Opt_usrjquota:
1061                         qtype = USRQUOTA;
1062                         goto set_qf_name;
1063                 case Opt_grpjquota:
1064                         qtype = GRPQUOTA;
1065 set_qf_name:
1066                         if (sb_any_quota_loaded(sb) &&
1067                             !sbi->s_qf_names[qtype]) {
1068                                 printk(KERN_ERR
1069                                         "EXT3-fs: Cannot change journaled "
1070                                         "quota options when quota turned on.\n");
1071                                 return 0;
1072                         }
1073                         qname = match_strdup(&args[0]);
1074                         if (!qname) {
1075                                 printk(KERN_ERR
1076                                         "EXT3-fs: not enough memory for "
1077                                         "storing quotafile name.\n");
1078                                 return 0;
1079                         }
1080                         if (sbi->s_qf_names[qtype] &&
1081                             strcmp(sbi->s_qf_names[qtype], qname)) {
1082                                 printk(KERN_ERR
1083                                         "EXT3-fs: %s quota file already "
1084                                         "specified.\n", QTYPE2NAME(qtype));
1085                                 kfree(qname);
1086                                 return 0;
1087                         }
1088                         sbi->s_qf_names[qtype] = qname;
1089                         if (strchr(sbi->s_qf_names[qtype], '/')) {
1090                                 printk(KERN_ERR
1091                                         "EXT3-fs: quotafile must be on "
1092                                         "filesystem root.\n");
1093                                 kfree(sbi->s_qf_names[qtype]);
1094                                 sbi->s_qf_names[qtype] = NULL;
1095                                 return 0;
1096                         }
1097                         set_opt(sbi->s_mount_opt, QUOTA);
1098                         break;
1099                 case Opt_offusrjquota:
1100                         qtype = USRQUOTA;
1101                         goto clear_qf_name;
1102                 case Opt_offgrpjquota:
1103                         qtype = GRPQUOTA;
1104 clear_qf_name:
1105                         if (sb_any_quota_loaded(sb) &&
1106                             sbi->s_qf_names[qtype]) {
1107                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1108                                         "journaled quota options when "
1109                                         "quota turned on.\n");
1110                                 return 0;
1111                         }
1112                         /*
1113                          * The space will be released later when all options
1114                          * are confirmed to be correct
1115                          */
1116                         sbi->s_qf_names[qtype] = NULL;
1117                         break;
1118                 case Opt_jqfmt_vfsold:
1119                         qfmt = QFMT_VFS_OLD;
1120                         goto set_qf_format;
1121                 case Opt_jqfmt_vfsv0:
1122                         qfmt = QFMT_VFS_V0;
1123 set_qf_format:
1124                         if (sb_any_quota_loaded(sb) &&
1125                             sbi->s_jquota_fmt != qfmt) {
1126                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1127                                         "journaled quota options when "
1128                                         "quota turned on.\n");
1129                                 return 0;
1130                         }
1131                         sbi->s_jquota_fmt = qfmt;
1132                         break;
1133                 case Opt_quota:
1134                 case Opt_usrquota:
1135                         set_opt(sbi->s_mount_opt, QUOTA);
1136                         set_opt(sbi->s_mount_opt, USRQUOTA);
1137                         break;
1138                 case Opt_grpquota:
1139                         set_opt(sbi->s_mount_opt, QUOTA);
1140                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1141                         break;
1142                 case Opt_noquota:
1143                         if (sb_any_quota_loaded(sb)) {
1144                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1145                                         "options when quota turned on.\n");
1146                                 return 0;
1147                         }
1148                         clear_opt(sbi->s_mount_opt, QUOTA);
1149                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1150                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1151                         break;
1152 #else
1153                 case Opt_quota:
1154                 case Opt_usrquota:
1155                 case Opt_grpquota:
1156                         printk(KERN_ERR
1157                                 "EXT3-fs: quota options not supported.\n");
1158                         break;
1159                 case Opt_usrjquota:
1160                 case Opt_grpjquota:
1161                 case Opt_offusrjquota:
1162                 case Opt_offgrpjquota:
1163                 case Opt_jqfmt_vfsold:
1164                 case Opt_jqfmt_vfsv0:
1165                         printk(KERN_ERR
1166                                 "EXT3-fs: journaled quota options not "
1167                                 "supported.\n");
1168                         break;
1169                 case Opt_noquota:
1170                         break;
1171 #endif
1172                 case Opt_abort:
1173                         set_opt(sbi->s_mount_opt, ABORT);
1174                         break;
1175                 case Opt_barrier:
1176                         if (match_int(&args[0], &option))
1177                                 return 0;
1178                         if (option)
1179                                 set_opt(sbi->s_mount_opt, BARRIER);
1180                         else
1181                                 clear_opt(sbi->s_mount_opt, BARRIER);
1182                         break;
1183                 case Opt_ignore:
1184                         break;
1185                 case Opt_resize:
1186                         if (!is_remount) {
1187                                 printk("EXT3-fs: resize option only available "
1188                                         "for remount\n");
1189                                 return 0;
1190                         }
1191                         if (match_int(&args[0], &option) != 0)
1192                                 return 0;
1193                         *n_blocks_count = option;
1194                         break;
1195                 case Opt_nobh:
1196                         set_opt(sbi->s_mount_opt, NOBH);
1197                         break;
1198                 case Opt_bh:
1199                         clear_opt(sbi->s_mount_opt, NOBH);
1200                         break;
1201                 default:
1202                         printk (KERN_ERR
1203                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1204                                 "or missing value\n", p);
1205                         return 0;
1206                 }
1207         }
1208 #ifdef CONFIG_QUOTA
1209         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1210                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1211                      sbi->s_qf_names[USRQUOTA])
1212                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1213
1214                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1215                      sbi->s_qf_names[GRPQUOTA])
1216                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1217
1218                 if ((sbi->s_qf_names[USRQUOTA] &&
1219                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1220                     (sbi->s_qf_names[GRPQUOTA] &&
1221                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1222                         printk(KERN_ERR "EXT3-fs: old and new quota "
1223                                         "format mixing.\n");
1224                         return 0;
1225                 }
1226
1227                 if (!sbi->s_jquota_fmt) {
1228                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1229                                         "not specified.\n");
1230                         return 0;
1231                 }
1232         } else {
1233                 if (sbi->s_jquota_fmt) {
1234                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1235                                         "specified with no journaling "
1236                                         "enabled.\n");
1237                         return 0;
1238                 }
1239         }
1240 #endif
1241         return 1;
1242 }
1243
1244 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1245                             int read_only)
1246 {
1247         struct ext3_sb_info *sbi = EXT3_SB(sb);
1248         int res = 0;
1249
1250         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1251                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1252                         "forcing read-only mode\n");
1253                 res = MS_RDONLY;
1254         }
1255         if (read_only)
1256                 return res;
1257         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1258                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1259                         "running e2fsck is recommended\n");
1260         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1261                 printk (KERN_WARNING
1262                         "EXT3-fs warning: mounting fs with errors, "
1263                         "running e2fsck is recommended\n");
1264         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1265                  le16_to_cpu(es->s_mnt_count) >=
1266                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1267                 printk (KERN_WARNING
1268                         "EXT3-fs warning: maximal mount count reached, "
1269                         "running e2fsck is recommended\n");
1270         else if (le32_to_cpu(es->s_checkinterval) &&
1271                 (le32_to_cpu(es->s_lastcheck) +
1272                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1273                 printk (KERN_WARNING
1274                         "EXT3-fs warning: checktime reached, "
1275                         "running e2fsck is recommended\n");
1276 #if 0
1277                 /* @@@ We _will_ want to clear the valid bit if we find
1278                    inconsistencies, to force a fsck at reboot.  But for
1279                    a plain journaled filesystem we can keep it set as
1280                    valid forever! :) */
1281         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1282 #endif
1283         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1284                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1285         le16_add_cpu(&es->s_mnt_count, 1);
1286         es->s_mtime = cpu_to_le32(get_seconds());
1287         ext3_update_dynamic_rev(sb);
1288         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1289
1290         ext3_commit_super(sb, es, 1);
1291         if (test_opt(sb, DEBUG))
1292                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1293                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1294                         sb->s_blocksize,
1295                         sbi->s_groups_count,
1296                         EXT3_BLOCKS_PER_GROUP(sb),
1297                         EXT3_INODES_PER_GROUP(sb),
1298                         sbi->s_mount_opt);
1299
1300         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1301         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1302                 char b[BDEVNAME_SIZE];
1303
1304                 printk("external journal on %s\n",
1305                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1306         } else {
1307                 printk("internal journal\n");
1308         }
1309         return res;
1310 }
1311
1312 /* Called at mount-time, super-block is locked */
1313 static int ext3_check_descriptors(struct super_block *sb)
1314 {
1315         struct ext3_sb_info *sbi = EXT3_SB(sb);
1316         int i;
1317
1318         ext3_debug ("Checking group descriptors");
1319
1320         for (i = 0; i < sbi->s_groups_count; i++) {
1321                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1322                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1323                 ext3_fsblk_t last_block;
1324
1325                 if (i == sbi->s_groups_count - 1)
1326                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1327                 else
1328                         last_block = first_block +
1329                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1330
1331                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1332                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1333                 {
1334                         ext3_error (sb, "ext3_check_descriptors",
1335                                     "Block bitmap for group %d"
1336                                     " not in group (block %lu)!",
1337                                     i, (unsigned long)
1338                                         le32_to_cpu(gdp->bg_block_bitmap));
1339                         return 0;
1340                 }
1341                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1342                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1343                 {
1344                         ext3_error (sb, "ext3_check_descriptors",
1345                                     "Inode bitmap for group %d"
1346                                     " not in group (block %lu)!",
1347                                     i, (unsigned long)
1348                                         le32_to_cpu(gdp->bg_inode_bitmap));
1349                         return 0;
1350                 }
1351                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1352                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1353                     last_block)
1354                 {
1355                         ext3_error (sb, "ext3_check_descriptors",
1356                                     "Inode table for group %d"
1357                                     " not in group (block %lu)!",
1358                                     i, (unsigned long)
1359                                         le32_to_cpu(gdp->bg_inode_table));
1360                         return 0;
1361                 }
1362         }
1363
1364         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1365         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1366         return 1;
1367 }
1368
1369
1370 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1371  * the superblock) which were deleted from all directories, but held open by
1372  * a process at the time of a crash.  We walk the list and try to delete these
1373  * inodes at recovery time (only with a read-write filesystem).
1374  *
1375  * In order to keep the orphan inode chain consistent during traversal (in
1376  * case of crash during recovery), we link each inode into the superblock
1377  * orphan list_head and handle it the same way as an inode deletion during
1378  * normal operation (which journals the operations for us).
1379  *
1380  * We only do an iget() and an iput() on each inode, which is very safe if we
1381  * accidentally point at an in-use or already deleted inode.  The worst that
1382  * can happen in this case is that we get a "bit already cleared" message from
1383  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1384  * e2fsck was run on this filesystem, and it must have already done the orphan
1385  * inode cleanup for us, so we can safely abort without any further action.
1386  */
1387 static void ext3_orphan_cleanup (struct super_block * sb,
1388                                  struct ext3_super_block * es)
1389 {
1390         unsigned int s_flags = sb->s_flags;
1391         int nr_orphans = 0, nr_truncates = 0;
1392 #ifdef CONFIG_QUOTA
1393         int i;
1394 #endif
1395         if (!es->s_last_orphan) {
1396                 jbd_debug(4, "no orphan inodes to clean up\n");
1397                 return;
1398         }
1399
1400         if (bdev_read_only(sb->s_bdev)) {
1401                 printk(KERN_ERR "EXT3-fs: write access "
1402                         "unavailable, skipping orphan cleanup.\n");
1403                 return;
1404         }
1405
1406         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1407                 if (es->s_last_orphan)
1408                         jbd_debug(1, "Errors on filesystem, "
1409                                   "clearing orphan list.\n");
1410                 es->s_last_orphan = 0;
1411                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1412                 return;
1413         }
1414
1415         if (s_flags & MS_RDONLY) {
1416                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1417                        sb->s_id);
1418                 sb->s_flags &= ~MS_RDONLY;
1419         }
1420 #ifdef CONFIG_QUOTA
1421         /* Needed for iput() to work correctly and not trash data */
1422         sb->s_flags |= MS_ACTIVE;
1423         /* Turn on quotas so that they are updated correctly */
1424         for (i = 0; i < MAXQUOTAS; i++) {
1425                 if (EXT3_SB(sb)->s_qf_names[i]) {
1426                         int ret = ext3_quota_on_mount(sb, i);
1427                         if (ret < 0)
1428                                 printk(KERN_ERR
1429                                         "EXT3-fs: Cannot turn on journaled "
1430                                         "quota: error %d\n", ret);
1431                 }
1432         }
1433 #endif
1434
1435         while (es->s_last_orphan) {
1436                 struct inode *inode;
1437
1438                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1439                 if (IS_ERR(inode)) {
1440                         es->s_last_orphan = 0;
1441                         break;
1442                 }
1443
1444                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1445                 vfs_dq_init(inode);
1446                 if (inode->i_nlink) {
1447                         printk(KERN_DEBUG
1448                                 "%s: truncating inode %lu to %Ld bytes\n",
1449                                 __func__, inode->i_ino, inode->i_size);
1450                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1451                                   inode->i_ino, inode->i_size);
1452                         ext3_truncate(inode);
1453                         nr_truncates++;
1454                 } else {
1455                         printk(KERN_DEBUG
1456                                 "%s: deleting unreferenced inode %lu\n",
1457                                 __func__, inode->i_ino);
1458                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1459                                   inode->i_ino);
1460                         nr_orphans++;
1461                 }
1462                 iput(inode);  /* The delete magic happens here! */
1463         }
1464
1465 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1466
1467         if (nr_orphans)
1468                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1469                        sb->s_id, PLURAL(nr_orphans));
1470         if (nr_truncates)
1471                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1472                        sb->s_id, PLURAL(nr_truncates));
1473 #ifdef CONFIG_QUOTA
1474         /* Turn quotas off */
1475         for (i = 0; i < MAXQUOTAS; i++) {
1476                 if (sb_dqopt(sb)->files[i])
1477                         vfs_quota_off(sb, i, 0);
1478         }
1479 #endif
1480         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1481 }
1482
1483 /*
1484  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1485  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1486  * We need to be 1 filesystem block less than the 2^32 sector limit.
1487  */
1488 static loff_t ext3_max_size(int bits)
1489 {
1490         loff_t res = EXT3_NDIR_BLOCKS;
1491         int meta_blocks;
1492         loff_t upper_limit;
1493
1494         /* This is calculated to be the largest file size for a
1495          * dense, file such that the total number of
1496          * sectors in the file, including data and all indirect blocks,
1497          * does not exceed 2^32 -1
1498          * __u32 i_blocks representing the total number of
1499          * 512 bytes blocks of the file
1500          */
1501         upper_limit = (1LL << 32) - 1;
1502
1503         /* total blocks in file system block size */
1504         upper_limit >>= (bits - 9);
1505
1506
1507         /* indirect blocks */
1508         meta_blocks = 1;
1509         /* double indirect blocks */
1510         meta_blocks += 1 + (1LL << (bits-2));
1511         /* tripple indirect blocks */
1512         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1513
1514         upper_limit -= meta_blocks;
1515         upper_limit <<= bits;
1516
1517         res += 1LL << (bits-2);
1518         res += 1LL << (2*(bits-2));
1519         res += 1LL << (3*(bits-2));
1520         res <<= bits;
1521         if (res > upper_limit)
1522                 res = upper_limit;
1523
1524         if (res > MAX_LFS_FILESIZE)
1525                 res = MAX_LFS_FILESIZE;
1526
1527         return res;
1528 }
1529
1530 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1531                                     ext3_fsblk_t logic_sb_block,
1532                                     int nr)
1533 {
1534         struct ext3_sb_info *sbi = EXT3_SB(sb);
1535         unsigned long bg, first_meta_bg;
1536         int has_super = 0;
1537
1538         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1539
1540         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1541             nr < first_meta_bg)
1542                 return (logic_sb_block + nr + 1);
1543         bg = sbi->s_desc_per_block * nr;
1544         if (ext3_bg_has_super(sb, bg))
1545                 has_super = 1;
1546         return (has_super + ext3_group_first_block_no(sb, bg));
1547 }
1548
1549
1550 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1551 {
1552         struct buffer_head * bh;
1553         struct ext3_super_block *es = NULL;
1554         struct ext3_sb_info *sbi;
1555         ext3_fsblk_t block;
1556         ext3_fsblk_t sb_block = get_sb_block(&data);
1557         ext3_fsblk_t logic_sb_block;
1558         unsigned long offset = 0;
1559         unsigned int journal_inum = 0;
1560         unsigned long journal_devnum = 0;
1561         unsigned long def_mount_opts;
1562         struct inode *root;
1563         int blocksize;
1564         int hblock;
1565         int db_count;
1566         int i;
1567         int needs_recovery;
1568         int ret = -EINVAL;
1569         __le32 features;
1570         int err;
1571
1572         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1573         if (!sbi)
1574                 return -ENOMEM;
1575
1576         sbi->s_blockgroup_lock =
1577                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1578         if (!sbi->s_blockgroup_lock) {
1579                 kfree(sbi);
1580                 return -ENOMEM;
1581         }
1582         sb->s_fs_info = sbi;
1583         sbi->s_mount_opt = 0;
1584         sbi->s_resuid = EXT3_DEF_RESUID;
1585         sbi->s_resgid = EXT3_DEF_RESGID;
1586         sbi->s_sb_block = sb_block;
1587
1588         unlock_kernel();
1589
1590         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1591         if (!blocksize) {
1592                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1593                 goto out_fail;
1594         }
1595
1596         /*
1597          * The ext3 superblock will not be buffer aligned for other than 1kB
1598          * block sizes.  We need to calculate the offset from buffer start.
1599          */
1600         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1601                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1602                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1603         } else {
1604                 logic_sb_block = sb_block;
1605         }
1606
1607         if (!(bh = sb_bread(sb, logic_sb_block))) {
1608                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1609                 goto out_fail;
1610         }
1611         /*
1612          * Note: s_es must be initialized as soon as possible because
1613          *       some ext3 macro-instructions depend on its value
1614          */
1615         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1616         sbi->s_es = es;
1617         sb->s_magic = le16_to_cpu(es->s_magic);
1618         if (sb->s_magic != EXT3_SUPER_MAGIC)
1619                 goto cantfind_ext3;
1620
1621         /* Set defaults before we parse the mount options */
1622         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1623         if (def_mount_opts & EXT3_DEFM_DEBUG)
1624                 set_opt(sbi->s_mount_opt, DEBUG);
1625         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1626                 set_opt(sbi->s_mount_opt, GRPID);
1627         if (def_mount_opts & EXT3_DEFM_UID16)
1628                 set_opt(sbi->s_mount_opt, NO_UID32);
1629 #ifdef CONFIG_EXT3_FS_XATTR
1630         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1631                 set_opt(sbi->s_mount_opt, XATTR_USER);
1632 #endif
1633 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1634         if (def_mount_opts & EXT3_DEFM_ACL)
1635                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1636 #endif
1637         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1638                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1639         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1640                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1641         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1642                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1643
1644         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1645                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1646         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1647                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1648         else
1649                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1650
1651         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1652         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1653
1654         set_opt(sbi->s_mount_opt, RESERVATION);
1655
1656         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1657                             NULL, 0))
1658                 goto failed_mount;
1659
1660         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1661                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1662
1663         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1664             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1665              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1666              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1667                 printk(KERN_WARNING
1668                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1669                        "running e2fsck is recommended\n");
1670         /*
1671          * Check feature flags regardless of the revision level, since we
1672          * previously didn't change the revision level when setting the flags,
1673          * so there is a chance incompat flags are set on a rev 0 filesystem.
1674          */
1675         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1676         if (features) {
1677                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1678                        "unsupported optional features (%x).\n",
1679                        sb->s_id, le32_to_cpu(features));
1680                 goto failed_mount;
1681         }
1682         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1683         if (!(sb->s_flags & MS_RDONLY) && features) {
1684                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1685                        "unsupported optional features (%x).\n",
1686                        sb->s_id, le32_to_cpu(features));
1687                 goto failed_mount;
1688         }
1689         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1690
1691         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1692             blocksize > EXT3_MAX_BLOCK_SIZE) {
1693                 printk(KERN_ERR
1694                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1695                        blocksize, sb->s_id);
1696                 goto failed_mount;
1697         }
1698
1699         hblock = bdev_hardsect_size(sb->s_bdev);
1700         if (sb->s_blocksize != blocksize) {
1701                 /*
1702                  * Make sure the blocksize for the filesystem is larger
1703                  * than the hardware sectorsize for the machine.
1704                  */
1705                 if (blocksize < hblock) {
1706                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1707                                "device blocksize %d.\n", blocksize, hblock);
1708                         goto failed_mount;
1709                 }
1710
1711                 brelse (bh);
1712                 if (!sb_set_blocksize(sb, blocksize)) {
1713                         printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1714                                 blocksize);
1715                         goto out_fail;
1716                 }
1717                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1718                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1719                 bh = sb_bread(sb, logic_sb_block);
1720                 if (!bh) {
1721                         printk(KERN_ERR
1722                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1723                         goto failed_mount;
1724                 }
1725                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1726                 sbi->s_es = es;
1727                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1728                         printk (KERN_ERR
1729                                 "EXT3-fs: Magic mismatch, very weird !\n");
1730                         goto failed_mount;
1731                 }
1732         }
1733
1734         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1735
1736         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1737                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1738                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1739         } else {
1740                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1741                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1742                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1743                     (!is_power_of_2(sbi->s_inode_size)) ||
1744                     (sbi->s_inode_size > blocksize)) {
1745                         printk (KERN_ERR
1746                                 "EXT3-fs: unsupported inode size: %d\n",
1747                                 sbi->s_inode_size);
1748                         goto failed_mount;
1749                 }
1750         }
1751         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1752                                    le32_to_cpu(es->s_log_frag_size);
1753         if (blocksize != sbi->s_frag_size) {
1754                 printk(KERN_ERR
1755                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1756                        sbi->s_frag_size, blocksize);
1757                 goto failed_mount;
1758         }
1759         sbi->s_frags_per_block = 1;
1760         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1761         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1762         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1763         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1764                 goto cantfind_ext3;
1765         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1766         if (sbi->s_inodes_per_block == 0)
1767                 goto cantfind_ext3;
1768         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1769                                         sbi->s_inodes_per_block;
1770         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1771         sbi->s_sbh = bh;
1772         sbi->s_mount_state = le16_to_cpu(es->s_state);
1773         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1774         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1775         for (i=0; i < 4; i++)
1776                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1777         sbi->s_def_hash_version = es->s_def_hash_version;
1778         i = le32_to_cpu(es->s_flags);
1779         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1780                 sbi->s_hash_unsigned = 3;
1781         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1782 #ifdef __CHAR_UNSIGNED__
1783                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1784                 sbi->s_hash_unsigned = 3;
1785 #else
1786                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1787 #endif
1788                 sb->s_dirt = 1;
1789         }
1790
1791         if (sbi->s_blocks_per_group > blocksize * 8) {
1792                 printk (KERN_ERR
1793                         "EXT3-fs: #blocks per group too big: %lu\n",
1794                         sbi->s_blocks_per_group);
1795                 goto failed_mount;
1796         }
1797         if (sbi->s_frags_per_group > blocksize * 8) {
1798                 printk (KERN_ERR
1799                         "EXT3-fs: #fragments per group too big: %lu\n",
1800                         sbi->s_frags_per_group);
1801                 goto failed_mount;
1802         }
1803         if (sbi->s_inodes_per_group > blocksize * 8) {
1804                 printk (KERN_ERR
1805                         "EXT3-fs: #inodes per group too big: %lu\n",
1806                         sbi->s_inodes_per_group);
1807                 goto failed_mount;
1808         }
1809
1810         if (le32_to_cpu(es->s_blocks_count) >
1811                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1812                 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1813                         " too large to mount safely\n", sb->s_id);
1814                 if (sizeof(sector_t) < 8)
1815                         printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1816                                         "enabled\n");
1817                 goto failed_mount;
1818         }
1819
1820         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1821                 goto cantfind_ext3;
1822         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1823                                le32_to_cpu(es->s_first_data_block) - 1)
1824                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1825         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1826                    EXT3_DESC_PER_BLOCK(sb);
1827         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1828                                     GFP_KERNEL);
1829         if (sbi->s_group_desc == NULL) {
1830                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1831                 goto failed_mount;
1832         }
1833
1834         bgl_lock_init(sbi->s_blockgroup_lock);
1835
1836         for (i = 0; i < db_count; i++) {
1837                 block = descriptor_loc(sb, logic_sb_block, i);
1838                 sbi->s_group_desc[i] = sb_bread(sb, block);
1839                 if (!sbi->s_group_desc[i]) {
1840                         printk (KERN_ERR "EXT3-fs: "
1841                                 "can't read group descriptor %d\n", i);
1842                         db_count = i;
1843                         goto failed_mount2;
1844                 }
1845         }
1846         if (!ext3_check_descriptors (sb)) {
1847                 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1848                 goto failed_mount2;
1849         }
1850         sbi->s_gdb_count = db_count;
1851         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1852         spin_lock_init(&sbi->s_next_gen_lock);
1853
1854         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1855                         ext3_count_free_blocks(sb));
1856         if (!err) {
1857                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1858                                 ext3_count_free_inodes(sb));
1859         }
1860         if (!err) {
1861                 err = percpu_counter_init(&sbi->s_dirs_counter,
1862                                 ext3_count_dirs(sb));
1863         }
1864         if (err) {
1865                 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1866                 goto failed_mount3;
1867         }
1868
1869         /* per fileystem reservation list head & lock */
1870         spin_lock_init(&sbi->s_rsv_window_lock);
1871         sbi->s_rsv_window_root = RB_ROOT;
1872         /* Add a single, static dummy reservation to the start of the
1873          * reservation window list --- it gives us a placeholder for
1874          * append-at-start-of-list which makes the allocation logic
1875          * _much_ simpler. */
1876         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1877         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1878         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1879         sbi->s_rsv_window_head.rsv_goal_size = 0;
1880         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1881
1882         /*
1883          * set up enough so that it can read an inode
1884          */
1885         sb->s_op = &ext3_sops;
1886         sb->s_export_op = &ext3_export_ops;
1887         sb->s_xattr = ext3_xattr_handlers;
1888 #ifdef CONFIG_QUOTA
1889         sb->s_qcop = &ext3_qctl_operations;
1890         sb->dq_op = &ext3_quota_operations;
1891 #endif
1892         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1893
1894         sb->s_root = NULL;
1895
1896         needs_recovery = (es->s_last_orphan != 0 ||
1897                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1898                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1899
1900         /*
1901          * The first inode we look at is the journal inode.  Don't try
1902          * root first: it may be modified in the journal!
1903          */
1904         if (!test_opt(sb, NOLOAD) &&
1905             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1906                 if (ext3_load_journal(sb, es, journal_devnum))
1907                         goto failed_mount3;
1908         } else if (journal_inum) {
1909                 if (ext3_create_journal(sb, es, journal_inum))
1910                         goto failed_mount3;
1911         } else {
1912                 if (!silent)
1913                         printk (KERN_ERR
1914                                 "ext3: No journal on filesystem on %s\n",
1915                                 sb->s_id);
1916                 goto failed_mount3;
1917         }
1918
1919         /* We have now updated the journal if required, so we can
1920          * validate the data journaling mode. */
1921         switch (test_opt(sb, DATA_FLAGS)) {
1922         case 0:
1923                 /* No mode set, assume a default based on the journal
1924                    capabilities: ORDERED_DATA if the journal can
1925                    cope, else JOURNAL_DATA */
1926                 if (journal_check_available_features
1927                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1928                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1929                 else
1930                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1931                 break;
1932
1933         case EXT3_MOUNT_ORDERED_DATA:
1934         case EXT3_MOUNT_WRITEBACK_DATA:
1935                 if (!journal_check_available_features
1936                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1937                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1938                                "requested data journaling mode\n");
1939                         goto failed_mount4;
1940                 }
1941         default:
1942                 break;
1943         }
1944
1945         if (test_opt(sb, NOBH)) {
1946                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1947                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1948                                 "its supported only with writeback mode\n");
1949                         clear_opt(sbi->s_mount_opt, NOBH);
1950                 }
1951         }
1952         /*
1953          * The journal_load will have done any necessary log recovery,
1954          * so we can safely mount the rest of the filesystem now.
1955          */
1956
1957         root = ext3_iget(sb, EXT3_ROOT_INO);
1958         if (IS_ERR(root)) {
1959                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1960                 ret = PTR_ERR(root);
1961                 goto failed_mount4;
1962         }
1963         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1964                 iput(root);
1965                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1966                 goto failed_mount4;
1967         }
1968         sb->s_root = d_alloc_root(root);
1969         if (!sb->s_root) {
1970                 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1971                 iput(root);
1972                 ret = -ENOMEM;
1973                 goto failed_mount4;
1974         }
1975
1976         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1977         /*
1978          * akpm: core read_super() calls in here with the superblock locked.
1979          * That deadlocks, because orphan cleanup needs to lock the superblock
1980          * in numerous places.  Here we just pop the lock - it's relatively
1981          * harmless, because we are now ready to accept write_super() requests,
1982          * and aviro says that's the only reason for hanging onto the
1983          * superblock lock.
1984          */
1985         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1986         ext3_orphan_cleanup(sb, es);
1987         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1988         if (needs_recovery)
1989                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1990         ext3_mark_recovery_complete(sb, es);
1991         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1992                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1993                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1994                 "writeback");
1995
1996         lock_kernel();
1997         return 0;
1998
1999 cantfind_ext3:
2000         if (!silent)
2001                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
2002                        sb->s_id);
2003         goto failed_mount;
2004
2005 failed_mount4:
2006         journal_destroy(sbi->s_journal);
2007 failed_mount3:
2008         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2009         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2010         percpu_counter_destroy(&sbi->s_dirs_counter);
2011 failed_mount2:
2012         for (i = 0; i < db_count; i++)
2013                 brelse(sbi->s_group_desc[i]);
2014         kfree(sbi->s_group_desc);
2015 failed_mount:
2016 #ifdef CONFIG_QUOTA
2017         for (i = 0; i < MAXQUOTAS; i++)
2018                 kfree(sbi->s_qf_names[i]);
2019 #endif
2020         ext3_blkdev_remove(sbi);
2021         brelse(bh);
2022 out_fail:
2023         sb->s_fs_info = NULL;
2024         kfree(sbi);
2025         lock_kernel();
2026         return ret;
2027 }
2028
2029 /*
2030  * Setup any per-fs journal parameters now.  We'll do this both on
2031  * initial mount, once the journal has been initialised but before we've
2032  * done any recovery; and again on any subsequent remount.
2033  */
2034 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2035 {
2036         struct ext3_sb_info *sbi = EXT3_SB(sb);
2037
2038         if (sbi->s_commit_interval)
2039                 journal->j_commit_interval = sbi->s_commit_interval;
2040         /* We could also set up an ext3-specific default for the commit
2041          * interval here, but for now we'll just fall back to the jbd
2042          * default. */
2043
2044         spin_lock(&journal->j_state_lock);
2045         if (test_opt(sb, BARRIER))
2046                 journal->j_flags |= JFS_BARRIER;
2047         else
2048                 journal->j_flags &= ~JFS_BARRIER;
2049         if (test_opt(sb, DATA_ERR_ABORT))
2050                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2051         else
2052                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2053         spin_unlock(&journal->j_state_lock);
2054 }
2055
2056 static journal_t *ext3_get_journal(struct super_block *sb,
2057                                    unsigned int journal_inum)
2058 {
2059         struct inode *journal_inode;
2060         journal_t *journal;
2061
2062         /* First, test for the existence of a valid inode on disk.  Bad
2063          * things happen if we iget() an unused inode, as the subsequent
2064          * iput() will try to delete it. */
2065
2066         journal_inode = ext3_iget(sb, journal_inum);
2067         if (IS_ERR(journal_inode)) {
2068                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2069                 return NULL;
2070         }
2071         if (!journal_inode->i_nlink) {
2072                 make_bad_inode(journal_inode);
2073                 iput(journal_inode);
2074                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2075                 return NULL;
2076         }
2077
2078         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2079                   journal_inode, journal_inode->i_size);
2080         if (!S_ISREG(journal_inode->i_mode)) {
2081                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2082                 iput(journal_inode);
2083                 return NULL;
2084         }
2085
2086         journal = journal_init_inode(journal_inode);
2087         if (!journal) {
2088                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2089                 iput(journal_inode);
2090                 return NULL;
2091         }
2092         journal->j_private = sb;
2093         ext3_init_journal_params(sb, journal);
2094         return journal;
2095 }
2096
2097 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2098                                        dev_t j_dev)
2099 {
2100         struct buffer_head * bh;
2101         journal_t *journal;
2102         ext3_fsblk_t start;
2103         ext3_fsblk_t len;
2104         int hblock, blocksize;
2105         ext3_fsblk_t sb_block;
2106         unsigned long offset;
2107         struct ext3_super_block * es;
2108         struct block_device *bdev;
2109
2110         bdev = ext3_blkdev_get(j_dev);
2111         if (bdev == NULL)
2112                 return NULL;
2113
2114         if (bd_claim(bdev, sb)) {
2115                 printk(KERN_ERR
2116                         "EXT3: failed to claim external journal device.\n");
2117                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2118                 return NULL;
2119         }
2120
2121         blocksize = sb->s_blocksize;
2122         hblock = bdev_hardsect_size(bdev);
2123         if (blocksize < hblock) {
2124                 printk(KERN_ERR
2125                         "EXT3-fs: blocksize too small for journal device.\n");
2126                 goto out_bdev;
2127         }
2128
2129         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2130         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2131         set_blocksize(bdev, blocksize);
2132         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2133                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2134                        "external journal\n");
2135                 goto out_bdev;
2136         }
2137
2138         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2139         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2140             !(le32_to_cpu(es->s_feature_incompat) &
2141               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2142                 printk(KERN_ERR "EXT3-fs: external journal has "
2143                                         "bad superblock\n");
2144                 brelse(bh);
2145                 goto out_bdev;
2146         }
2147
2148         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2149                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2150                 brelse(bh);
2151                 goto out_bdev;
2152         }
2153
2154         len = le32_to_cpu(es->s_blocks_count);
2155         start = sb_block + 1;
2156         brelse(bh);     /* we're done with the superblock */
2157
2158         journal = journal_init_dev(bdev, sb->s_bdev,
2159                                         start, len, blocksize);
2160         if (!journal) {
2161                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2162                 goto out_bdev;
2163         }
2164         journal->j_private = sb;
2165         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2166         wait_on_buffer(journal->j_sb_buffer);
2167         if (!buffer_uptodate(journal->j_sb_buffer)) {
2168                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2169                 goto out_journal;
2170         }
2171         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2172                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2173                                         "user (unsupported) - %d\n",
2174                         be32_to_cpu(journal->j_superblock->s_nr_users));
2175                 goto out_journal;
2176         }
2177         EXT3_SB(sb)->journal_bdev = bdev;
2178         ext3_init_journal_params(sb, journal);
2179         return journal;
2180 out_journal:
2181         journal_destroy(journal);
2182 out_bdev:
2183         ext3_blkdev_put(bdev);
2184         return NULL;
2185 }
2186
2187 static int ext3_load_journal(struct super_block *sb,
2188                              struct ext3_super_block *es,
2189                              unsigned long journal_devnum)
2190 {
2191         journal_t *journal;
2192         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2193         dev_t journal_dev;
2194         int err = 0;
2195         int really_read_only;
2196
2197         if (journal_devnum &&
2198             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2199                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2200                         "numbers have changed\n");
2201                 journal_dev = new_decode_dev(journal_devnum);
2202         } else
2203                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2204
2205         really_read_only = bdev_read_only(sb->s_bdev);
2206
2207         /*
2208          * Are we loading a blank journal or performing recovery after a
2209          * crash?  For recovery, we need to check in advance whether we
2210          * can get read-write access to the device.
2211          */
2212
2213         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2214                 if (sb->s_flags & MS_RDONLY) {
2215                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
2216                                         "required on readonly filesystem.\n");
2217                         if (really_read_only) {
2218                                 printk(KERN_ERR "EXT3-fs: write access "
2219                                         "unavailable, cannot proceed.\n");
2220                                 return -EROFS;
2221                         }
2222                         printk (KERN_INFO "EXT3-fs: write access will "
2223                                         "be enabled during recovery.\n");
2224                 }
2225         }
2226
2227         if (journal_inum && journal_dev) {
2228                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2229                        "and inode journals!\n");
2230                 return -EINVAL;
2231         }
2232
2233         if (journal_inum) {
2234                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2235                         return -EINVAL;
2236         } else {
2237                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2238                         return -EINVAL;
2239         }
2240
2241         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2242                 err = journal_update_format(journal);
2243                 if (err)  {
2244                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2245                         journal_destroy(journal);
2246                         return err;
2247                 }
2248         }
2249
2250         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2251                 err = journal_wipe(journal, !really_read_only);
2252         if (!err)
2253                 err = journal_load(journal);
2254
2255         if (err) {
2256                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2257                 journal_destroy(journal);
2258                 return err;
2259         }
2260
2261         EXT3_SB(sb)->s_journal = journal;
2262         ext3_clear_journal_err(sb, es);
2263
2264         if (journal_devnum &&
2265             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2266                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2267                 sb->s_dirt = 1;
2268
2269                 /* Make sure we flush the recovery flag to disk. */
2270                 ext3_commit_super(sb, es, 1);
2271         }
2272
2273         return 0;
2274 }
2275
2276 static int ext3_create_journal(struct super_block * sb,
2277                                struct ext3_super_block * es,
2278                                unsigned int journal_inum)
2279 {
2280         journal_t *journal;
2281         int err;
2282
2283         if (sb->s_flags & MS_RDONLY) {
2284                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2285                                 "create journal.\n");
2286                 return -EROFS;
2287         }
2288
2289         journal = ext3_get_journal(sb, journal_inum);
2290         if (!journal)
2291                 return -EINVAL;
2292
2293         printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2294                journal_inum);
2295
2296         err = journal_create(journal);
2297         if (err) {
2298                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2299                 journal_destroy(journal);
2300                 return -EIO;
2301         }
2302
2303         EXT3_SB(sb)->s_journal = journal;
2304
2305         ext3_update_dynamic_rev(sb);
2306         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2307         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2308
2309         es->s_journal_inum = cpu_to_le32(journal_inum);
2310         sb->s_dirt = 1;
2311
2312         /* Make sure we flush the recovery flag to disk. */
2313         ext3_commit_super(sb, es, 1);
2314
2315         return 0;
2316 }
2317
2318 static int ext3_commit_super(struct super_block *sb,
2319                                struct ext3_super_block *es,
2320                                int sync)
2321 {
2322         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2323         int error = 0;
2324
2325         if (!sbh)
2326                 return error;
2327         es->s_wtime = cpu_to_le32(get_seconds());
2328         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2329         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2330         BUFFER_TRACE(sbh, "marking dirty");
2331         mark_buffer_dirty(sbh);
2332         if (sync)
2333                 error = sync_dirty_buffer(sbh);
2334         return error;
2335 }
2336
2337
2338 /*
2339  * Have we just finished recovery?  If so, and if we are mounting (or
2340  * remounting) the filesystem readonly, then we will end up with a
2341  * consistent fs on disk.  Record that fact.
2342  */
2343 static void ext3_mark_recovery_complete(struct super_block * sb,
2344                                         struct ext3_super_block * es)
2345 {
2346         journal_t *journal = EXT3_SB(sb)->s_journal;
2347
2348         journal_lock_updates(journal);
2349         if (journal_flush(journal) < 0)
2350                 goto out;
2351
2352         lock_super(sb);
2353         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2354             sb->s_flags & MS_RDONLY) {
2355                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2356                 sb->s_dirt = 0;
2357                 ext3_commit_super(sb, es, 1);
2358         }
2359         unlock_super(sb);
2360
2361 out:
2362         journal_unlock_updates(journal);
2363 }
2364
2365 /*
2366  * If we are mounting (or read-write remounting) a filesystem whose journal
2367  * has recorded an error from a previous lifetime, move that error to the
2368  * main filesystem now.
2369  */
2370 static void ext3_clear_journal_err(struct super_block * sb,
2371                                    struct ext3_super_block * es)
2372 {
2373         journal_t *journal;
2374         int j_errno;
2375         const char *errstr;
2376
2377         journal = EXT3_SB(sb)->s_journal;
2378
2379         /*
2380          * Now check for any error status which may have been recorded in the
2381          * journal by a prior ext3_error() or ext3_abort()
2382          */
2383
2384         j_errno = journal_errno(journal);
2385         if (j_errno) {
2386                 char nbuf[16];
2387
2388                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2389                 ext3_warning(sb, __func__, "Filesystem error recorded "
2390                              "from previous mount: %s", errstr);
2391                 ext3_warning(sb, __func__, "Marking fs in need of "
2392                              "filesystem check.");
2393
2394                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2395                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2396                 ext3_commit_super (sb, es, 1);
2397
2398                 journal_clear_err(journal);
2399         }
2400 }
2401
2402 /*
2403  * Force the running and committing transactions to commit,
2404  * and wait on the commit.
2405  */
2406 int ext3_force_commit(struct super_block *sb)
2407 {
2408         journal_t *journal;
2409         int ret;
2410
2411         if (sb->s_flags & MS_RDONLY)
2412                 return 0;
2413
2414         journal = EXT3_SB(sb)->s_journal;
2415         sb->s_dirt = 0;
2416         ret = ext3_journal_force_commit(journal);
2417         return ret;
2418 }
2419
2420 /*
2421  * Ext3 always journals updates to the superblock itself, so we don't
2422  * have to propagate any other updates to the superblock on disk at this
2423  * point.  (We can probably nuke this function altogether, and remove
2424  * any mention to sb->s_dirt in all of fs/ext3; eventual cleanup...)
2425  */
2426 static void ext3_write_super (struct super_block * sb)
2427 {
2428         if (mutex_trylock(&sb->s_lock) != 0)
2429                 BUG();
2430         sb->s_dirt = 0;
2431 }
2432
2433 static int ext3_sync_fs(struct super_block *sb, int wait)
2434 {
2435         tid_t target;
2436
2437         sb->s_dirt = 0;
2438         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2439                 if (wait)
2440                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2441         }
2442         return 0;
2443 }
2444
2445 /*
2446  * LVM calls this function before a (read-only) snapshot is created.  This
2447  * gives us a chance to flush the journal completely and mark the fs clean.
2448  */
2449 static int ext3_freeze(struct super_block *sb)
2450 {
2451         int error = 0;
2452         journal_t *journal;
2453         sb->s_dirt = 0;
2454
2455         if (!(sb->s_flags & MS_RDONLY)) {
2456                 journal = EXT3_SB(sb)->s_journal;
2457
2458                 /* Now we set up the journal barrier. */
2459                 journal_lock_updates(journal);
2460
2461                 /*
2462                  * We don't want to clear needs_recovery flag when we failed
2463                  * to flush the journal.
2464                  */
2465                 error = journal_flush(journal);
2466                 if (error < 0)
2467                         goto out;
2468
2469                 /* Journal blocked and flushed, clear needs_recovery flag. */
2470                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2471                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2472                 if (error)
2473                         goto out;
2474         }
2475         return 0;
2476
2477 out:
2478         journal_unlock_updates(journal);
2479         return error;
2480 }
2481
2482 /*
2483  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2484  * flag here, even though the filesystem is not technically dirty yet.
2485  */
2486 static int ext3_unfreeze(struct super_block *sb)
2487 {
2488         if (!(sb->s_flags & MS_RDONLY)) {
2489                 lock_super(sb);
2490                 /* Reser the needs_recovery flag before the fs is unlocked. */
2491                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2492                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2493                 unlock_super(sb);
2494                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2495         }
2496         return 0;
2497 }
2498
2499 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2500 {
2501         struct ext3_super_block * es;
2502         struct ext3_sb_info *sbi = EXT3_SB(sb);
2503         ext3_fsblk_t n_blocks_count = 0;
2504         unsigned long old_sb_flags;
2505         struct ext3_mount_options old_opts;
2506         int err;
2507 #ifdef CONFIG_QUOTA
2508         int i;
2509 #endif
2510
2511         /* Store the original options */
2512         old_sb_flags = sb->s_flags;
2513         old_opts.s_mount_opt = sbi->s_mount_opt;
2514         old_opts.s_resuid = sbi->s_resuid;
2515         old_opts.s_resgid = sbi->s_resgid;
2516         old_opts.s_commit_interval = sbi->s_commit_interval;
2517 #ifdef CONFIG_QUOTA
2518         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2519         for (i = 0; i < MAXQUOTAS; i++)
2520                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2521 #endif
2522
2523         /*
2524          * Allow the "check" option to be passed as a remount option.
2525          */
2526         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2527                 err = -EINVAL;
2528                 goto restore_opts;
2529         }
2530
2531         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2532                 ext3_abort(sb, __func__, "Abort forced by user");
2533
2534         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2535                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2536
2537         es = sbi->s_es;
2538
2539         ext3_init_journal_params(sb, sbi->s_journal);
2540
2541         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2542                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2543                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2544                         err = -EROFS;
2545                         goto restore_opts;
2546                 }
2547
2548                 if (*flags & MS_RDONLY) {
2549                         /*
2550                          * First of all, the unconditional stuff we have to do
2551                          * to disable replay of the journal when we next remount
2552                          */
2553                         sb->s_flags |= MS_RDONLY;
2554
2555                         /*
2556                          * OK, test if we are remounting a valid rw partition
2557                          * readonly, and if so set the rdonly flag and then
2558                          * mark the partition as valid again.
2559                          */
2560                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2561                             (sbi->s_mount_state & EXT3_VALID_FS))
2562                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2563
2564                         /*
2565                          * We have to unlock super so that we can wait for
2566                          * transactions.
2567                          */
2568                         unlock_super(sb);
2569                         ext3_mark_recovery_complete(sb, es);
2570                         lock_super(sb);
2571                 } else {
2572                         __le32 ret;
2573                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2574                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2575                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2576                                        "remount RDWR because of unsupported "
2577                                        "optional features (%x).\n",
2578                                        sb->s_id, le32_to_cpu(ret));
2579                                 err = -EROFS;
2580                                 goto restore_opts;
2581                         }
2582
2583                         /*
2584                          * If we have an unprocessed orphan list hanging
2585                          * around from a previously readonly bdev mount,
2586                          * require a full umount/remount for now.
2587                          */
2588                         if (es->s_last_orphan) {
2589                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2590                                        "remount RDWR because of unprocessed "
2591                                        "orphan inode list.  Please "
2592                                        "umount/remount instead.\n",
2593                                        sb->s_id);
2594                                 err = -EINVAL;
2595                                 goto restore_opts;
2596                         }
2597
2598                         /*
2599                          * Mounting a RDONLY partition read-write, so reread
2600                          * and store the current valid flag.  (It may have
2601                          * been changed by e2fsck since we originally mounted
2602                          * the partition.)
2603                          */
2604                         ext3_clear_journal_err(sb, es);
2605                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2606                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2607                                 goto restore_opts;
2608                         if (!ext3_setup_super (sb, es, 0))
2609                                 sb->s_flags &= ~MS_RDONLY;
2610                 }
2611         }
2612 #ifdef CONFIG_QUOTA
2613         /* Release old quota file names */
2614         for (i = 0; i < MAXQUOTAS; i++)
2615                 if (old_opts.s_qf_names[i] &&
2616                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2617                         kfree(old_opts.s_qf_names[i]);
2618 #endif
2619         return 0;
2620 restore_opts:
2621         sb->s_flags = old_sb_flags;
2622         sbi->s_mount_opt = old_opts.s_mount_opt;
2623         sbi->s_resuid = old_opts.s_resuid;
2624         sbi->s_resgid = old_opts.s_resgid;
2625         sbi->s_commit_interval = old_opts.s_commit_interval;
2626 #ifdef CONFIG_QUOTA
2627         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2628         for (i = 0; i < MAXQUOTAS; i++) {
2629                 if (sbi->s_qf_names[i] &&
2630                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2631                         kfree(sbi->s_qf_names[i]);
2632                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2633         }
2634 #endif
2635         return err;
2636 }
2637
2638 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2639 {
2640         struct super_block *sb = dentry->d_sb;
2641         struct ext3_sb_info *sbi = EXT3_SB(sb);
2642         struct ext3_super_block *es = sbi->s_es;
2643         u64 fsid;
2644
2645         if (test_opt(sb, MINIX_DF)) {
2646                 sbi->s_overhead_last = 0;
2647         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2648                 unsigned long ngroups = sbi->s_groups_count, i;
2649                 ext3_fsblk_t overhead = 0;
2650                 smp_rmb();
2651
2652                 /*
2653                  * Compute the overhead (FS structures).  This is constant
2654                  * for a given filesystem unless the number of block groups
2655                  * changes so we cache the previous value until it does.
2656                  */
2657
2658                 /*
2659                  * All of the blocks before first_data_block are
2660                  * overhead
2661                  */
2662                 overhead = le32_to_cpu(es->s_first_data_block);
2663
2664                 /*
2665                  * Add the overhead attributed to the superblock and
2666                  * block group descriptors.  If the sparse superblocks
2667                  * feature is turned on, then not all groups have this.
2668                  */
2669                 for (i = 0; i < ngroups; i++) {
2670                         overhead += ext3_bg_has_super(sb, i) +
2671                                 ext3_bg_num_gdb(sb, i);
2672                         cond_resched();
2673                 }
2674
2675                 /*
2676                  * Every block group has an inode bitmap, a block
2677                  * bitmap, and an inode table.
2678                  */
2679                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2680                 sbi->s_overhead_last = overhead;
2681                 smp_wmb();
2682                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2683         }
2684
2685         buf->f_type = EXT3_SUPER_MAGIC;
2686         buf->f_bsize = sb->s_blocksize;
2687         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2688         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2689         es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2690         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2691         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2692                 buf->f_bavail = 0;
2693         buf->f_files = le32_to_cpu(es->s_inodes_count);
2694         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2695         es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2696         buf->f_namelen = EXT3_NAME_LEN;
2697         fsid = le64_to_cpup((void *)es->s_uuid) ^
2698                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2699         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2700         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2701         return 0;
2702 }
2703
2704 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2705  * is locked for write. Otherwise the are possible deadlocks:
2706  * Process 1                         Process 2
2707  * ext3_create()                     quota_sync()
2708  *   journal_start()                   write_dquot()
2709  *   vfs_dq_init()                       down(dqio_mutex)
2710  *     down(dqio_mutex)                    journal_start()
2711  *
2712  */
2713
2714 #ifdef CONFIG_QUOTA
2715
2716 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2717 {
2718         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2719 }
2720
2721 static int ext3_write_dquot(struct dquot *dquot)
2722 {
2723         int ret, err;
2724         handle_t *handle;
2725         struct inode *inode;
2726
2727         inode = dquot_to_inode(dquot);
2728         handle = ext3_journal_start(inode,
2729                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2730         if (IS_ERR(handle))
2731                 return PTR_ERR(handle);
2732         ret = dquot_commit(dquot);
2733         err = ext3_journal_stop(handle);
2734         if (!ret)
2735                 ret = err;
2736         return ret;
2737 }
2738
2739 static int ext3_acquire_dquot(struct dquot *dquot)
2740 {
2741         int ret, err;
2742         handle_t *handle;
2743
2744         handle = ext3_journal_start(dquot_to_inode(dquot),
2745                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2746         if (IS_ERR(handle))
2747                 return PTR_ERR(handle);
2748         ret = dquot_acquire(dquot);
2749         err = ext3_journal_stop(handle);
2750         if (!ret)
2751                 ret = err;
2752         return ret;
2753 }
2754
2755 static int ext3_release_dquot(struct dquot *dquot)
2756 {
2757         int ret, err;
2758         handle_t *handle;
2759
2760         handle = ext3_journal_start(dquot_to_inode(dquot),
2761                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2762         if (IS_ERR(handle)) {
2763                 /* Release dquot anyway to avoid endless cycle in dqput() */
2764                 dquot_release(dquot);
2765                 return PTR_ERR(handle);
2766         }
2767         ret = dquot_release(dquot);
2768         err = ext3_journal_stop(handle);
2769         if (!ret)
2770                 ret = err;
2771         return ret;
2772 }
2773
2774 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2775 {
2776         /* Are we journaling quotas? */
2777         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2778             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2779                 dquot_mark_dquot_dirty(dquot);
2780                 return ext3_write_dquot(dquot);
2781         } else {
2782                 return dquot_mark_dquot_dirty(dquot);
2783         }
2784 }
2785
2786 static int ext3_write_info(struct super_block *sb, int type)
2787 {
2788         int ret, err;
2789         handle_t *handle;
2790
2791         /* Data block + inode block */
2792         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2793         if (IS_ERR(handle))
2794                 return PTR_ERR(handle);
2795         ret = dquot_commit_info(sb, type);
2796         err = ext3_journal_stop(handle);
2797         if (!ret)
2798                 ret = err;
2799         return ret;
2800 }
2801
2802 /*
2803  * Turn on quotas during mount time - we need to find
2804  * the quota file and such...
2805  */
2806 static int ext3_quota_on_mount(struct super_block *sb, int type)
2807 {
2808         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2809                         EXT3_SB(sb)->s_jquota_fmt, type);
2810 }
2811
2812 /*
2813  * Standard function to be called on quota_on
2814  */
2815 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2816                          char *name, int remount)
2817 {
2818         int err;
2819         struct path path;
2820
2821         if (!test_opt(sb, QUOTA))
2822                 return -EINVAL;
2823         /* When remounting, no checks are needed and in fact, name is NULL */
2824         if (remount)
2825                 return vfs_quota_on(sb, type, format_id, name, remount);
2826
2827         err = kern_path(name, LOOKUP_FOLLOW, &path);
2828         if (err)
2829                 return err;
2830
2831         /* Quotafile not on the same filesystem? */
2832         if (path.mnt->mnt_sb != sb) {
2833                 path_put(&path);
2834                 return -EXDEV;
2835         }
2836         /* Journaling quota? */
2837         if (EXT3_SB(sb)->s_qf_names[type]) {
2838                 /* Quotafile not of fs root? */
2839                 if (path.dentry->d_parent != sb->s_root)
2840                         printk(KERN_WARNING
2841                                 "EXT3-fs: Quota file not on filesystem root. "
2842                                 "Journaled quota will not work.\n");
2843         }
2844
2845         /*
2846          * When we journal data on quota file, we have to flush journal to see
2847          * all updates to the file when we bypass pagecache...
2848          */
2849         if (ext3_should_journal_data(path.dentry->d_inode)) {
2850                 /*
2851                  * We don't need to lock updates but journal_flush() could
2852                  * otherwise be livelocked...
2853                  */
2854                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2855                 err = journal_flush(EXT3_SB(sb)->s_journal);
2856                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2857                 if (err) {
2858                         path_put(&path);
2859                         return err;
2860                 }
2861         }
2862
2863         err = vfs_quota_on_path(sb, type, format_id, &path);
2864         path_put(&path);
2865         return err;
2866 }
2867
2868 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2869  * acquiring the locks... As quota files are never truncated and quota code
2870  * itself serializes the operations (and noone else should touch the files)
2871  * we don't have to be afraid of races */
2872 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2873                                size_t len, loff_t off)
2874 {
2875         struct inode *inode = sb_dqopt(sb)->files[type];
2876         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2877         int err = 0;
2878         int offset = off & (sb->s_blocksize - 1);
2879         int tocopy;
2880         size_t toread;
2881         struct buffer_head *bh;
2882         loff_t i_size = i_size_read(inode);
2883
2884         if (off > i_size)
2885                 return 0;
2886         if (off+len > i_size)
2887                 len = i_size-off;
2888         toread = len;
2889         while (toread > 0) {
2890                 tocopy = sb->s_blocksize - offset < toread ?
2891                                 sb->s_blocksize - offset : toread;
2892                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2893                 if (err)
2894                         return err;
2895                 if (!bh)        /* A hole? */
2896                         memset(data, 0, tocopy);
2897                 else
2898                         memcpy(data, bh->b_data+offset, tocopy);
2899                 brelse(bh);
2900                 offset = 0;
2901                 toread -= tocopy;
2902                 data += tocopy;
2903                 blk++;
2904         }
2905         return len;
2906 }
2907
2908 /* Write to quotafile (we know the transaction is already started and has
2909  * enough credits) */
2910 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2911                                 const char *data, size_t len, loff_t off)
2912 {
2913         struct inode *inode = sb_dqopt(sb)->files[type];
2914         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2915         int err = 0;
2916         int offset = off & (sb->s_blocksize - 1);
2917         int tocopy;
2918         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2919         size_t towrite = len;
2920         struct buffer_head *bh;
2921         handle_t *handle = journal_current_handle();
2922
2923         if (!handle) {
2924                 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2925                         " cancelled because transaction is not started.\n",
2926                         (unsigned long long)off, (unsigned long long)len);
2927                 return -EIO;
2928         }
2929         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2930         while (towrite > 0) {
2931                 tocopy = sb->s_blocksize - offset < towrite ?
2932                                 sb->s_blocksize - offset : towrite;
2933                 bh = ext3_bread(handle, inode, blk, 1, &err);
2934                 if (!bh)
2935                         goto out;
2936                 if (journal_quota) {
2937                         err = ext3_journal_get_write_access(handle, bh);
2938                         if (err) {
2939                                 brelse(bh);
2940                                 goto out;
2941                         }
2942                 }
2943                 lock_buffer(bh);
2944                 memcpy(bh->b_data+offset, data, tocopy);
2945                 flush_dcache_page(bh->b_page);
2946                 unlock_buffer(bh);
2947                 if (journal_quota)
2948                         err = ext3_journal_dirty_metadata(handle, bh);
2949                 else {
2950                         /* Always do at least ordered writes for quotas */
2951                         err = ext3_journal_dirty_data(handle, bh);
2952                         mark_buffer_dirty(bh);
2953                 }
2954                 brelse(bh);
2955                 if (err)
2956                         goto out;
2957                 offset = 0;
2958                 towrite -= tocopy;
2959                 data += tocopy;
2960                 blk++;
2961         }
2962 out:
2963         if (len == towrite) {
2964                 mutex_unlock(&inode->i_mutex);
2965                 return err;
2966         }
2967         if (inode->i_size < off+len-towrite) {
2968                 i_size_write(inode, off+len-towrite);
2969                 EXT3_I(inode)->i_disksize = inode->i_size;
2970         }
2971         inode->i_version++;
2972         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2973         ext3_mark_inode_dirty(handle, inode);
2974         mutex_unlock(&inode->i_mutex);
2975         return len - towrite;
2976 }
2977
2978 #endif
2979
2980 static int ext3_get_sb(struct file_system_type *fs_type,
2981         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2982 {
2983         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2984 }
2985
2986 static struct file_system_type ext3_fs_type = {
2987         .owner          = THIS_MODULE,
2988         .name           = "ext3",
2989         .get_sb         = ext3_get_sb,
2990         .kill_sb        = kill_block_super,
2991         .fs_flags       = FS_REQUIRES_DEV,
2992 };
2993
2994 static int __init init_ext3_fs(void)
2995 {
2996         int err = init_ext3_xattr();
2997         if (err)
2998                 return err;
2999         err = init_inodecache();
3000         if (err)
3001                 goto out1;
3002         err = register_filesystem(&ext3_fs_type);
3003         if (err)
3004                 goto out;
3005         return 0;
3006 out:
3007         destroy_inodecache();
3008 out1:
3009         exit_ext3_xattr();
3010         return err;
3011 }
3012
3013 static void __exit exit_ext3_fs(void)
3014 {
3015         unregister_filesystem(&ext3_fs_type);
3016         destroy_inodecache();
3017         exit_ext3_xattr();
3018 }
3019
3020 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3021 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3022 MODULE_LICENSE("GPL");
3023 module_init(init_ext3_fs)
3024 module_exit(exit_ext3_fs)