f7d4a2c19dee0f8a25f50b09194bb2f9a73cab53
[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 int ext3_freeze(struct super_block *sb);
71
72 /*
73  * Wrappers for journal_start/end.
74  *
75  * The only special thing we need to do here is to make sure that all
76  * journal_end calls result in the superblock being marked dirty, so
77  * that sync() will call the filesystem's write_super callback if
78  * appropriate.
79  */
80 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
81 {
82         journal_t *journal;
83
84         if (sb->s_flags & MS_RDONLY)
85                 return ERR_PTR(-EROFS);
86
87         /* Special case here: if the journal has aborted behind our
88          * backs (eg. EIO in the commit thread), then we still need to
89          * take the FS itself readonly cleanly. */
90         journal = EXT3_SB(sb)->s_journal;
91         if (is_journal_aborted(journal)) {
92                 ext3_abort(sb, __func__,
93                            "Detected aborted journal");
94                 return ERR_PTR(-EROFS);
95         }
96
97         return journal_start(journal, nblocks);
98 }
99
100 /*
101  * The only special thing we need to do here is to make sure that all
102  * journal_stop calls result in the superblock being marked dirty, so
103  * that sync() will call the filesystem's write_super callback if
104  * appropriate.
105  */
106 int __ext3_journal_stop(const char *where, handle_t *handle)
107 {
108         struct super_block *sb;
109         int err;
110         int rc;
111
112         sb = handle->h_transaction->t_journal->j_private;
113         err = handle->h_err;
114         rc = journal_stop(handle);
115
116         if (!err)
117                 err = rc;
118         if (err)
119                 __ext3_std_error(sb, where, err);
120         return err;
121 }
122
123 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
124                 struct buffer_head *bh, handle_t *handle, int err)
125 {
126         char nbuf[16];
127         const char *errstr = ext3_decode_error(NULL, err, nbuf);
128
129         if (bh)
130                 BUFFER_TRACE(bh, "abort");
131
132         if (!handle->h_err)
133                 handle->h_err = err;
134
135         if (is_handle_aborted(handle))
136                 return;
137
138         printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
139                 caller, errstr, err_fn);
140
141         journal_abort_handle(handle);
142 }
143
144 void ext3_msg(struct super_block *sb, const char *prefix,
145                 const char *fmt, ...)
146 {
147         va_list args;
148
149         va_start(args, fmt);
150         printk("%sEXT3-fs (%s): ", prefix, sb->s_id);
151         vprintk(fmt, args);
152         printk("\n");
153         va_end(args);
154 }
155
156 /* Deal with the reporting of failure conditions on a filesystem such as
157  * inconsistencies detected or read IO failures.
158  *
159  * On ext2, we can store the error state of the filesystem in the
160  * superblock.  That is not possible on ext3, because we may have other
161  * write ordering constraints on the superblock which prevent us from
162  * writing it out straight away; and given that the journal is about to
163  * be aborted, we can't rely on the current, or future, transactions to
164  * write out the superblock safely.
165  *
166  * We'll just use the journal_abort() error code to record an error in
167  * the journal instead.  On recovery, the journal will compain about
168  * that error until we've noted it down and cleared it.
169  */
170
171 static void ext3_handle_error(struct super_block *sb)
172 {
173         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
174
175         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
176         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
177
178         if (sb->s_flags & MS_RDONLY)
179                 return;
180
181         if (!test_opt (sb, ERRORS_CONT)) {
182                 journal_t *journal = EXT3_SB(sb)->s_journal;
183
184                 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
185                 if (journal)
186                         journal_abort(journal, -EIO);
187         }
188         if (test_opt (sb, ERRORS_RO)) {
189                 ext3_msg(sb, KERN_CRIT,
190                         "error: remounting filesystem read-only");
191                 sb->s_flags |= MS_RDONLY;
192         }
193         ext3_commit_super(sb, es, 1);
194         if (test_opt(sb, ERRORS_PANIC))
195                 panic("EXT3-fs (%s): panic forced after error\n",
196                         sb->s_id);
197 }
198
199 void ext3_error (struct super_block * sb, const char * function,
200                  const char * fmt, ...)
201 {
202         va_list args;
203
204         va_start(args, fmt);
205         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
206         vprintk(fmt, args);
207         printk("\n");
208         va_end(args);
209
210         ext3_handle_error(sb);
211 }
212
213 static const char *ext3_decode_error(struct super_block * sb, int errno,
214                                      char nbuf[16])
215 {
216         char *errstr = NULL;
217
218         switch (errno) {
219         case -EIO:
220                 errstr = "IO failure";
221                 break;
222         case -ENOMEM:
223                 errstr = "Out of memory";
224                 break;
225         case -EROFS:
226                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
227                         errstr = "Journal has aborted";
228                 else
229                         errstr = "Readonly filesystem";
230                 break;
231         default:
232                 /* If the caller passed in an extra buffer for unknown
233                  * errors, textualise them now.  Else we just return
234                  * NULL. */
235                 if (nbuf) {
236                         /* Check for truncated error codes... */
237                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
238                                 errstr = nbuf;
239                 }
240                 break;
241         }
242
243         return errstr;
244 }
245
246 /* __ext3_std_error decodes expected errors from journaling functions
247  * automatically and invokes the appropriate error response.  */
248
249 void __ext3_std_error (struct super_block * sb, const char * function,
250                        int errno)
251 {
252         char nbuf[16];
253         const char *errstr;
254
255         /* Special case: if the error is EROFS, and we're not already
256          * inside a transaction, then there's really no point in logging
257          * an error. */
258         if (errno == -EROFS && journal_current_handle() == NULL &&
259             (sb->s_flags & MS_RDONLY))
260                 return;
261
262         errstr = ext3_decode_error(sb, errno, nbuf);
263         ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
264
265         ext3_handle_error(sb);
266 }
267
268 /*
269  * ext3_abort is a much stronger failure handler than ext3_error.  The
270  * abort function may be used to deal with unrecoverable failures such
271  * as journal IO errors or ENOMEM at a critical moment in log management.
272  *
273  * We unconditionally force the filesystem into an ABORT|READONLY state,
274  * unless the error response on the fs has been set to panic in which
275  * case we take the easy way out and panic immediately.
276  */
277
278 void ext3_abort (struct super_block * sb, const char * function,
279                  const char * fmt, ...)
280 {
281         va_list args;
282
283         va_start(args, fmt);
284         printk(KERN_CRIT "EXT3-fs (%s): error: %s: ", sb->s_id, function);
285         vprintk(fmt, args);
286         printk("\n");
287         va_end(args);
288
289         if (test_opt(sb, ERRORS_PANIC))
290                 panic("EXT3-fs: panic from previous error\n");
291
292         if (sb->s_flags & MS_RDONLY)
293                 return;
294
295         ext3_msg(sb, KERN_CRIT,
296                 "error: remounting filesystem read-only");
297         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
298         sb->s_flags |= MS_RDONLY;
299         set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
300         if (EXT3_SB(sb)->s_journal)
301                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
302 }
303
304 void ext3_warning (struct super_block * sb, const char * function,
305                    const char * fmt, ...)
306 {
307         va_list args;
308
309         va_start(args, fmt);
310         printk(KERN_WARNING "EXT3-fs (%s): warning: %s: ",
311                sb->s_id, function);
312         vprintk(fmt, args);
313         printk("\n");
314         va_end(args);
315 }
316
317 void ext3_update_dynamic_rev(struct super_block *sb)
318 {
319         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
320
321         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
322                 return;
323
324         ext3_msg(sb, KERN_WARNING,
325                 "warning: updating to rev %d because of "
326                 "new feature flag, running e2fsck is recommended",
327                 EXT3_DYNAMIC_REV);
328
329         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
330         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
331         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
332         /* leave es->s_feature_*compat flags alone */
333         /* es->s_uuid will be set by e2fsck if empty */
334
335         /*
336          * The rest of the superblock fields should be zero, and if not it
337          * means they are likely already in use, so leave them alone.  We
338          * can leave it up to e2fsck to clean up any inconsistencies there.
339          */
340 }
341
342 /*
343  * Open the external journal device
344  */
345 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
346 {
347         struct block_device *bdev;
348         char b[BDEVNAME_SIZE];
349
350         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
351         if (IS_ERR(bdev))
352                 goto fail;
353         return bdev;
354
355 fail:
356         ext3_msg(sb, "error: failed to open journal device %s: %ld",
357                 __bdevname(dev, b), PTR_ERR(bdev));
358
359         return NULL;
360 }
361
362 /*
363  * Release the journal device
364  */
365 static int ext3_blkdev_put(struct block_device *bdev)
366 {
367         bd_release(bdev);
368         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
369 }
370
371 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
372 {
373         struct block_device *bdev;
374         int ret = -ENODEV;
375
376         bdev = sbi->journal_bdev;
377         if (bdev) {
378                 ret = ext3_blkdev_put(bdev);
379                 sbi->journal_bdev = NULL;
380         }
381         return ret;
382 }
383
384 static inline struct inode *orphan_list_entry(struct list_head *l)
385 {
386         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
387 }
388
389 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
390 {
391         struct list_head *l;
392
393         ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
394                le32_to_cpu(sbi->s_es->s_last_orphan));
395
396         ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
397         list_for_each(l, &sbi->s_orphan) {
398                 struct inode *inode = orphan_list_entry(l);
399                 ext3_msg(sb, KERN_ERR, "  "
400                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
401                        inode->i_sb->s_id, inode->i_ino, inode,
402                        inode->i_mode, inode->i_nlink,
403                        NEXT_ORPHAN(inode));
404         }
405 }
406
407 static void ext3_put_super (struct super_block * sb)
408 {
409         struct ext3_sb_info *sbi = EXT3_SB(sb);
410         struct ext3_super_block *es = sbi->s_es;
411         int i, err;
412
413         lock_kernel();
414
415         ext3_xattr_put_super(sb);
416         err = journal_destroy(sbi->s_journal);
417         sbi->s_journal = NULL;
418         if (err < 0)
419                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
420
421         if (!(sb->s_flags & MS_RDONLY)) {
422                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
423                 es->s_state = cpu_to_le16(sbi->s_mount_state);
424                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
425                 mark_buffer_dirty(sbi->s_sbh);
426                 ext3_commit_super(sb, es, 1);
427         }
428
429         for (i = 0; i < sbi->s_gdb_count; i++)
430                 brelse(sbi->s_group_desc[i]);
431         kfree(sbi->s_group_desc);
432         percpu_counter_destroy(&sbi->s_freeblocks_counter);
433         percpu_counter_destroy(&sbi->s_freeinodes_counter);
434         percpu_counter_destroy(&sbi->s_dirs_counter);
435         brelse(sbi->s_sbh);
436 #ifdef CONFIG_QUOTA
437         for (i = 0; i < MAXQUOTAS; i++)
438                 kfree(sbi->s_qf_names[i]);
439 #endif
440
441         /* Debugging code just in case the in-memory inode orphan list
442          * isn't empty.  The on-disk one can be non-empty if we've
443          * detected an error and taken the fs readonly, but the
444          * in-memory list had better be clean by this point. */
445         if (!list_empty(&sbi->s_orphan))
446                 dump_orphan_list(sb, sbi);
447         J_ASSERT(list_empty(&sbi->s_orphan));
448
449         invalidate_bdev(sb->s_bdev);
450         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
451                 /*
452                  * Invalidate the journal device's buffers.  We don't want them
453                  * floating about in memory - the physical journal device may
454                  * hotswapped, and it breaks the `ro-after' testing code.
455                  */
456                 sync_blockdev(sbi->journal_bdev);
457                 invalidate_bdev(sbi->journal_bdev);
458                 ext3_blkdev_remove(sbi);
459         }
460         sb->s_fs_info = NULL;
461         kfree(sbi->s_blockgroup_lock);
462         kfree(sbi);
463
464         unlock_kernel();
465 }
466
467 static struct kmem_cache *ext3_inode_cachep;
468
469 /*
470  * Called inside transaction, so use GFP_NOFS
471  */
472 static struct inode *ext3_alloc_inode(struct super_block *sb)
473 {
474         struct ext3_inode_info *ei;
475
476         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
477         if (!ei)
478                 return NULL;
479         ei->i_block_alloc_info = NULL;
480         ei->vfs_inode.i_version = 1;
481         atomic_set(&ei->i_datasync_tid, 0);
482         atomic_set(&ei->i_sync_tid, 0);
483         return &ei->vfs_inode;
484 }
485
486 static void ext3_destroy_inode(struct inode *inode)
487 {
488         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
489                 printk("EXT3 Inode %p: orphan list check failed!\n",
490                         EXT3_I(inode));
491                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
492                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
493                                 false);
494                 dump_stack();
495         }
496         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
497 }
498
499 static void init_once(void *foo)
500 {
501         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
502
503         INIT_LIST_HEAD(&ei->i_orphan);
504 #ifdef CONFIG_EXT3_FS_XATTR
505         init_rwsem(&ei->xattr_sem);
506 #endif
507         mutex_init(&ei->truncate_mutex);
508         inode_init_once(&ei->vfs_inode);
509 }
510
511 static int init_inodecache(void)
512 {
513         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
514                                              sizeof(struct ext3_inode_info),
515                                              0, (SLAB_RECLAIM_ACCOUNT|
516                                                 SLAB_MEM_SPREAD),
517                                              init_once);
518         if (ext3_inode_cachep == NULL)
519                 return -ENOMEM;
520         return 0;
521 }
522
523 static void destroy_inodecache(void)
524 {
525         kmem_cache_destroy(ext3_inode_cachep);
526 }
527
528 static void ext3_clear_inode(struct inode *inode)
529 {
530         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
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                 char *fmtname = "";
544
545                 switch (sbi->s_jquota_fmt) {
546                 case QFMT_VFS_OLD:
547                         fmtname = "vfsold";
548                         break;
549                 case QFMT_VFS_V0:
550                         fmtname = "vfsv0";
551                         break;
552                 case QFMT_VFS_V1:
553                         fmtname = "vfsv1";
554                         break;
555                 }
556                 seq_printf(seq, ",jqfmt=%s", fmtname);
557         }
558
559         if (sbi->s_qf_names[USRQUOTA])
560                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
561
562         if (sbi->s_qf_names[GRPQUOTA])
563                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
564
565         if (test_opt(sb, USRQUOTA))
566                 seq_puts(seq, ",usrquota");
567
568         if (test_opt(sb, GRPQUOTA))
569                 seq_puts(seq, ",grpquota");
570 #endif
571 }
572
573 static char *data_mode_string(unsigned long mode)
574 {
575         switch (mode) {
576         case EXT3_MOUNT_JOURNAL_DATA:
577                 return "journal";
578         case EXT3_MOUNT_ORDERED_DATA:
579                 return "ordered";
580         case EXT3_MOUNT_WRITEBACK_DATA:
581                 return "writeback";
582         }
583         return "unknown";
584 }
585
586 /*
587  * Show an option if
588  *  - it's set to a non-default value OR
589  *  - if the per-sb default is different from the global default
590  */
591 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
592 {
593         struct super_block *sb = vfs->mnt_sb;
594         struct ext3_sb_info *sbi = EXT3_SB(sb);
595         struct ext3_super_block *es = sbi->s_es;
596         unsigned long def_mount_opts;
597
598         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
599
600         if (sbi->s_sb_block != 1)
601                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
602         if (test_opt(sb, MINIX_DF))
603                 seq_puts(seq, ",minixdf");
604         if (test_opt(sb, GRPID))
605                 seq_puts(seq, ",grpid");
606         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
607                 seq_puts(seq, ",nogrpid");
608         if (sbi->s_resuid != EXT3_DEF_RESUID ||
609             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
610                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
611         }
612         if (sbi->s_resgid != EXT3_DEF_RESGID ||
613             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
614                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
615         }
616         if (test_opt(sb, ERRORS_RO)) {
617                 int def_errors = le16_to_cpu(es->s_errors);
618
619                 if (def_errors == EXT3_ERRORS_PANIC ||
620                     def_errors == EXT3_ERRORS_CONTINUE) {
621                         seq_puts(seq, ",errors=remount-ro");
622                 }
623         }
624         if (test_opt(sb, ERRORS_CONT))
625                 seq_puts(seq, ",errors=continue");
626         if (test_opt(sb, ERRORS_PANIC))
627                 seq_puts(seq, ",errors=panic");
628         if (test_opt(sb, NO_UID32))
629                 seq_puts(seq, ",nouid32");
630         if (test_opt(sb, DEBUG))
631                 seq_puts(seq, ",debug");
632         if (test_opt(sb, OLDALLOC))
633                 seq_puts(seq, ",oldalloc");
634 #ifdef CONFIG_EXT3_FS_XATTR
635         if (test_opt(sb, XATTR_USER))
636                 seq_puts(seq, ",user_xattr");
637         if (!test_opt(sb, XATTR_USER) &&
638             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
639                 seq_puts(seq, ",nouser_xattr");
640         }
641 #endif
642 #ifdef CONFIG_EXT3_FS_POSIX_ACL
643         if (test_opt(sb, POSIX_ACL))
644                 seq_puts(seq, ",acl");
645         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
646                 seq_puts(seq, ",noacl");
647 #endif
648         if (!test_opt(sb, RESERVATION))
649                 seq_puts(seq, ",noreservation");
650         if (sbi->s_commit_interval) {
651                 seq_printf(seq, ",commit=%u",
652                            (unsigned) (sbi->s_commit_interval / HZ));
653         }
654         if (test_opt(sb, BARRIER))
655                 seq_puts(seq, ",barrier=1");
656         if (test_opt(sb, NOBH))
657                 seq_puts(seq, ",nobh");
658
659         seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
660         if (test_opt(sb, DATA_ERR_ABORT))
661                 seq_puts(seq, ",data_err=abort");
662
663         if (test_opt(sb, NOLOAD))
664                 seq_puts(seq, ",norecovery");
665
666         ext3_show_quota_options(seq, sb);
667
668         return 0;
669 }
670
671
672 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
673                 u64 ino, u32 generation)
674 {
675         struct inode *inode;
676
677         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
678                 return ERR_PTR(-ESTALE);
679         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
680                 return ERR_PTR(-ESTALE);
681
682         /* iget isn't really right if the inode is currently unallocated!!
683          *
684          * ext3_read_inode will return a bad_inode if the inode had been
685          * deleted, so we should be safe.
686          *
687          * Currently we don't know the generation for parent directory, so
688          * a generation of 0 means "accept any"
689          */
690         inode = ext3_iget(sb, ino);
691         if (IS_ERR(inode))
692                 return ERR_CAST(inode);
693         if (generation && inode->i_generation != generation) {
694                 iput(inode);
695                 return ERR_PTR(-ESTALE);
696         }
697
698         return inode;
699 }
700
701 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
702                 int fh_len, int fh_type)
703 {
704         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
705                                     ext3_nfs_get_inode);
706 }
707
708 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
709                 int fh_len, int fh_type)
710 {
711         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
712                                     ext3_nfs_get_inode);
713 }
714
715 /*
716  * Try to release metadata pages (indirect blocks, directories) which are
717  * mapped via the block device.  Since these pages could have journal heads
718  * which would prevent try_to_free_buffers() from freeing them, we must use
719  * jbd layer's try_to_free_buffers() function to release them.
720  */
721 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
722                                  gfp_t wait)
723 {
724         journal_t *journal = EXT3_SB(sb)->s_journal;
725
726         WARN_ON(PageChecked(page));
727         if (!page_has_buffers(page))
728                 return 0;
729         if (journal)
730                 return journal_try_to_free_buffers(journal, page, 
731                                                    wait & ~__GFP_WAIT);
732         return try_to_free_buffers(page);
733 }
734
735 #ifdef CONFIG_QUOTA
736 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
737 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
738
739 static int ext3_write_dquot(struct dquot *dquot);
740 static int ext3_acquire_dquot(struct dquot *dquot);
741 static int ext3_release_dquot(struct dquot *dquot);
742 static int ext3_mark_dquot_dirty(struct dquot *dquot);
743 static int ext3_write_info(struct super_block *sb, int type);
744 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
745                                 char *path, int remount);
746 static int ext3_quota_on_mount(struct super_block *sb, int type);
747 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
748                                size_t len, loff_t off);
749 static ssize_t ext3_quota_write(struct super_block *sb, int type,
750                                 const char *data, size_t len, loff_t off);
751
752 static const struct dquot_operations ext3_quota_operations = {
753         .initialize     = dquot_initialize,
754         .drop           = dquot_drop,
755         .write_dquot    = ext3_write_dquot,
756         .acquire_dquot  = ext3_acquire_dquot,
757         .release_dquot  = ext3_release_dquot,
758         .mark_dirty     = ext3_mark_dquot_dirty,
759         .write_info     = ext3_write_info,
760         .alloc_dquot    = dquot_alloc,
761         .destroy_dquot  = dquot_destroy,
762 };
763
764 static const struct quotactl_ops ext3_qctl_operations = {
765         .quota_on       = ext3_quota_on,
766         .quota_off      = vfs_quota_off,
767         .quota_sync     = vfs_quota_sync,
768         .get_info       = vfs_get_dqinfo,
769         .set_info       = vfs_set_dqinfo,
770         .get_dqblk      = vfs_get_dqblk,
771         .set_dqblk      = vfs_set_dqblk
772 };
773 #endif
774
775 static const struct super_operations ext3_sops = {
776         .alloc_inode    = ext3_alloc_inode,
777         .destroy_inode  = ext3_destroy_inode,
778         .write_inode    = ext3_write_inode,
779         .dirty_inode    = ext3_dirty_inode,
780         .delete_inode   = ext3_delete_inode,
781         .put_super      = ext3_put_super,
782         .sync_fs        = ext3_sync_fs,
783         .freeze_fs      = ext3_freeze,
784         .unfreeze_fs    = ext3_unfreeze,
785         .statfs         = ext3_statfs,
786         .remount_fs     = ext3_remount,
787         .clear_inode    = ext3_clear_inode,
788         .show_options   = ext3_show_options,
789 #ifdef CONFIG_QUOTA
790         .quota_read     = ext3_quota_read,
791         .quota_write    = ext3_quota_write,
792 #endif
793         .bdev_try_to_free_page = bdev_try_to_free_page,
794 };
795
796 static const struct export_operations ext3_export_ops = {
797         .fh_to_dentry = ext3_fh_to_dentry,
798         .fh_to_parent = ext3_fh_to_parent,
799         .get_parent = ext3_get_parent,
800 };
801
802 enum {
803         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
804         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
805         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
806         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
807         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
808         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
809         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
810         Opt_data_err_abort, Opt_data_err_ignore,
811         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
812         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
813         Opt_noquota, Opt_ignore, Opt_barrier, Opt_err, Opt_resize,
814         Opt_usrquota, Opt_grpquota
815 };
816
817 static const match_table_t tokens = {
818         {Opt_bsd_df, "bsddf"},
819         {Opt_minix_df, "minixdf"},
820         {Opt_grpid, "grpid"},
821         {Opt_grpid, "bsdgroups"},
822         {Opt_nogrpid, "nogrpid"},
823         {Opt_nogrpid, "sysvgroups"},
824         {Opt_resgid, "resgid=%u"},
825         {Opt_resuid, "resuid=%u"},
826         {Opt_sb, "sb=%u"},
827         {Opt_err_cont, "errors=continue"},
828         {Opt_err_panic, "errors=panic"},
829         {Opt_err_ro, "errors=remount-ro"},
830         {Opt_nouid32, "nouid32"},
831         {Opt_nocheck, "nocheck"},
832         {Opt_nocheck, "check=none"},
833         {Opt_debug, "debug"},
834         {Opt_oldalloc, "oldalloc"},
835         {Opt_orlov, "orlov"},
836         {Opt_user_xattr, "user_xattr"},
837         {Opt_nouser_xattr, "nouser_xattr"},
838         {Opt_acl, "acl"},
839         {Opt_noacl, "noacl"},
840         {Opt_reservation, "reservation"},
841         {Opt_noreservation, "noreservation"},
842         {Opt_noload, "noload"},
843         {Opt_noload, "norecovery"},
844         {Opt_nobh, "nobh"},
845         {Opt_bh, "bh"},
846         {Opt_commit, "commit=%u"},
847         {Opt_journal_update, "journal=update"},
848         {Opt_journal_inum, "journal=%u"},
849         {Opt_journal_dev, "journal_dev=%u"},
850         {Opt_abort, "abort"},
851         {Opt_data_journal, "data=journal"},
852         {Opt_data_ordered, "data=ordered"},
853         {Opt_data_writeback, "data=writeback"},
854         {Opt_data_err_abort, "data_err=abort"},
855         {Opt_data_err_ignore, "data_err=ignore"},
856         {Opt_offusrjquota, "usrjquota="},
857         {Opt_usrjquota, "usrjquota=%s"},
858         {Opt_offgrpjquota, "grpjquota="},
859         {Opt_grpjquota, "grpjquota=%s"},
860         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
861         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
862         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
863         {Opt_grpquota, "grpquota"},
864         {Opt_noquota, "noquota"},
865         {Opt_quota, "quota"},
866         {Opt_usrquota, "usrquota"},
867         {Opt_barrier, "barrier=%u"},
868         {Opt_resize, "resize"},
869         {Opt_err, NULL},
870 };
871
872 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
873 {
874         ext3_fsblk_t    sb_block;
875         char            *options = (char *) *data;
876
877         if (!options || strncmp(options, "sb=", 3) != 0)
878                 return 1;       /* Default location */
879         options += 3;
880         /*todo: use simple_strtoll with >32bit ext3 */
881         sb_block = simple_strtoul(options, &options, 0);
882         if (*options && *options != ',') {
883                 ext3_msg(sb, "error: invalid sb specification: %s",
884                        (char *) *data);
885                 return 1;
886         }
887         if (*options == ',')
888                 options++;
889         *data = (void *) options;
890         return sb_block;
891 }
892
893 #ifdef CONFIG_QUOTA
894 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
895 {
896         struct ext3_sb_info *sbi = EXT3_SB(sb);
897         char *qname;
898
899         if (sb_any_quota_loaded(sb) &&
900                 !sbi->s_qf_names[qtype]) {
901                 ext3_msg(sb, KERN_ERR,
902                         "Cannot change journaled "
903                         "quota options when quota turned on");
904                 return 0;
905         }
906         qname = match_strdup(args);
907         if (!qname) {
908                 ext3_msg(sb, KERN_ERR,
909                         "Not enough memory for storing quotafile name");
910                 return 0;
911         }
912         if (sbi->s_qf_names[qtype] &&
913                 strcmp(sbi->s_qf_names[qtype], qname)) {
914                 ext3_msg(sb, KERN_ERR,
915                         "%s quota file already specified", QTYPE2NAME(qtype));
916                 kfree(qname);
917                 return 0;
918         }
919         sbi->s_qf_names[qtype] = qname;
920         if (strchr(sbi->s_qf_names[qtype], '/')) {
921                 ext3_msg(sb, KERN_ERR,
922                         "quotafile must be on filesystem root");
923                 kfree(sbi->s_qf_names[qtype]);
924                 sbi->s_qf_names[qtype] = NULL;
925                 return 0;
926         }
927         set_opt(sbi->s_mount_opt, QUOTA);
928         return 1;
929 }
930
931 static int clear_qf_name(struct super_block *sb, int qtype) {
932
933         struct ext3_sb_info *sbi = EXT3_SB(sb);
934
935         if (sb_any_quota_loaded(sb) &&
936                 sbi->s_qf_names[qtype]) {
937                 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
938                         " when quota turned on");
939                 return 0;
940         }
941         /*
942          * The space will be released later when all options are confirmed
943          * to be correct
944          */
945         sbi->s_qf_names[qtype] = NULL;
946         return 1;
947 }
948 #endif
949
950 static int parse_options (char *options, struct super_block *sb,
951                           unsigned int *inum, unsigned long *journal_devnum,
952                           ext3_fsblk_t *n_blocks_count, int is_remount)
953 {
954         struct ext3_sb_info *sbi = EXT3_SB(sb);
955         char * p;
956         substring_t args[MAX_OPT_ARGS];
957         int data_opt = 0;
958         int option;
959 #ifdef CONFIG_QUOTA
960         int qfmt;
961 #endif
962
963         if (!options)
964                 return 1;
965
966         while ((p = strsep (&options, ",")) != NULL) {
967                 int token;
968                 if (!*p)
969                         continue;
970
971                 token = match_token(p, tokens, args);
972                 switch (token) {
973                 case Opt_bsd_df:
974                         clear_opt (sbi->s_mount_opt, MINIX_DF);
975                         break;
976                 case Opt_minix_df:
977                         set_opt (sbi->s_mount_opt, MINIX_DF);
978                         break;
979                 case Opt_grpid:
980                         set_opt (sbi->s_mount_opt, GRPID);
981                         break;
982                 case Opt_nogrpid:
983                         clear_opt (sbi->s_mount_opt, GRPID);
984                         break;
985                 case Opt_resuid:
986                         if (match_int(&args[0], &option))
987                                 return 0;
988                         sbi->s_resuid = option;
989                         break;
990                 case Opt_resgid:
991                         if (match_int(&args[0], &option))
992                                 return 0;
993                         sbi->s_resgid = option;
994                         break;
995                 case Opt_sb:
996                         /* handled by get_sb_block() instead of here */
997                         /* *sb_block = match_int(&args[0]); */
998                         break;
999                 case Opt_err_panic:
1000                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1001                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1002                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1003                         break;
1004                 case Opt_err_ro:
1005                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1006                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1007                         set_opt (sbi->s_mount_opt, ERRORS_RO);
1008                         break;
1009                 case Opt_err_cont:
1010                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1011                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1012                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
1013                         break;
1014                 case Opt_nouid32:
1015                         set_opt (sbi->s_mount_opt, NO_UID32);
1016                         break;
1017                 case Opt_nocheck:
1018                         clear_opt (sbi->s_mount_opt, CHECK);
1019                         break;
1020                 case Opt_debug:
1021                         set_opt (sbi->s_mount_opt, DEBUG);
1022                         break;
1023                 case Opt_oldalloc:
1024                         set_opt (sbi->s_mount_opt, OLDALLOC);
1025                         break;
1026                 case Opt_orlov:
1027                         clear_opt (sbi->s_mount_opt, OLDALLOC);
1028                         break;
1029 #ifdef CONFIG_EXT3_FS_XATTR
1030                 case Opt_user_xattr:
1031                         set_opt (sbi->s_mount_opt, XATTR_USER);
1032                         break;
1033                 case Opt_nouser_xattr:
1034                         clear_opt (sbi->s_mount_opt, XATTR_USER);
1035                         break;
1036 #else
1037                 case Opt_user_xattr:
1038                 case Opt_nouser_xattr:
1039                         ext3_msg(sb, KERN_INFO,
1040                                 "(no)user_xattr options not supported");
1041                         break;
1042 #endif
1043 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1044                 case Opt_acl:
1045                         set_opt(sbi->s_mount_opt, POSIX_ACL);
1046                         break;
1047                 case Opt_noacl:
1048                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
1049                         break;
1050 #else
1051                 case Opt_acl:
1052                 case Opt_noacl:
1053                         ext3_msg(sb, KERN_INFO,
1054                                 "(no)acl options not supported");
1055                         break;
1056 #endif
1057                 case Opt_reservation:
1058                         set_opt(sbi->s_mount_opt, RESERVATION);
1059                         break;
1060                 case Opt_noreservation:
1061                         clear_opt(sbi->s_mount_opt, RESERVATION);
1062                         break;
1063                 case Opt_journal_update:
1064                         /* @@@ FIXME */
1065                         /* Eventually we will want to be able to create
1066                            a journal file here.  For now, only allow the
1067                            user to specify an existing inode to be the
1068                            journal file. */
1069                         if (is_remount) {
1070                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1071                                         "journal on remount");
1072                                 return 0;
1073                         }
1074                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1075                         break;
1076                 case Opt_journal_inum:
1077                         if (is_remount) {
1078                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1079                                        "journal on remount");
1080                                 return 0;
1081                         }
1082                         if (match_int(&args[0], &option))
1083                                 return 0;
1084                         *inum = option;
1085                         break;
1086                 case Opt_journal_dev:
1087                         if (is_remount) {
1088                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1089                                        "journal on remount");
1090                                 return 0;
1091                         }
1092                         if (match_int(&args[0], &option))
1093                                 return 0;
1094                         *journal_devnum = option;
1095                         break;
1096                 case Opt_noload:
1097                         set_opt (sbi->s_mount_opt, NOLOAD);
1098                         break;
1099                 case Opt_commit:
1100                         if (match_int(&args[0], &option))
1101                                 return 0;
1102                         if (option < 0)
1103                                 return 0;
1104                         if (option == 0)
1105                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1106                         sbi->s_commit_interval = HZ * option;
1107                         break;
1108                 case Opt_data_journal:
1109                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1110                         goto datacheck;
1111                 case Opt_data_ordered:
1112                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1113                         goto datacheck;
1114                 case Opt_data_writeback:
1115                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1116                 datacheck:
1117                         if (is_remount) {
1118                                 if (test_opt(sb, DATA_FLAGS) == data_opt)
1119                                         break;
1120                                 ext3_msg(sb, KERN_ERR,
1121                                         "error: cannot change "
1122                                         "data mode on remount. The filesystem "
1123                                         "is mounted in data=%s mode and you "
1124                                         "try to remount it in data=%s mode.",
1125                                         data_mode_string(test_opt(sb,
1126                                                         DATA_FLAGS)),
1127                                         data_mode_string(data_opt));
1128                                 return 0;
1129                         } else {
1130                                 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1131                                 sbi->s_mount_opt |= data_opt;
1132                         }
1133                         break;
1134                 case Opt_data_err_abort:
1135                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1136                         break;
1137                 case Opt_data_err_ignore:
1138                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1139                         break;
1140 #ifdef CONFIG_QUOTA
1141                 case Opt_usrjquota:
1142                         if (!set_qf_name(sb, USRQUOTA, &args[0]))
1143                                 return 0;
1144                         break;
1145                 case Opt_grpjquota:
1146                         if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1147                                 return 0;
1148                         break;
1149                 case Opt_offusrjquota:
1150                         if (!clear_qf_name(sb, USRQUOTA))
1151                                 return 0;
1152                         break;
1153                 case Opt_offgrpjquota:
1154                         if (!clear_qf_name(sb, GRPQUOTA))
1155                                 return 0;
1156                         break;
1157                 case Opt_jqfmt_vfsold:
1158                         qfmt = QFMT_VFS_OLD;
1159                         goto set_qf_format;
1160                 case Opt_jqfmt_vfsv0:
1161                         qfmt = QFMT_VFS_V0;
1162                         goto set_qf_format;
1163                 case Opt_jqfmt_vfsv1:
1164                         qfmt = QFMT_VFS_V1;
1165 set_qf_format:
1166                         if (sb_any_quota_loaded(sb) &&
1167                             sbi->s_jquota_fmt != qfmt) {
1168                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1169                                         "journaled quota options when "
1170                                         "quota turned on.");
1171                                 return 0;
1172                         }
1173                         sbi->s_jquota_fmt = qfmt;
1174                         break;
1175                 case Opt_quota:
1176                 case Opt_usrquota:
1177                         set_opt(sbi->s_mount_opt, QUOTA);
1178                         set_opt(sbi->s_mount_opt, USRQUOTA);
1179                         break;
1180                 case Opt_grpquota:
1181                         set_opt(sbi->s_mount_opt, QUOTA);
1182                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1183                         break;
1184                 case Opt_noquota:
1185                         if (sb_any_quota_loaded(sb)) {
1186                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1187                                         "quota options when quota turned on.");
1188                                 return 0;
1189                         }
1190                         clear_opt(sbi->s_mount_opt, QUOTA);
1191                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1192                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1193                         break;
1194 #else
1195                 case Opt_quota:
1196                 case Opt_usrquota:
1197                 case Opt_grpquota:
1198                         ext3_msg(sb, KERN_ERR,
1199                                 "error: quota options not supported.");
1200                         break;
1201                 case Opt_usrjquota:
1202                 case Opt_grpjquota:
1203                 case Opt_offusrjquota:
1204                 case Opt_offgrpjquota:
1205                 case Opt_jqfmt_vfsold:
1206                 case Opt_jqfmt_vfsv0:
1207                 case Opt_jqfmt_vfsv1:
1208                         ext3_msg(sb, KERN_ERR,
1209                                 "error: journaled quota options not "
1210                                 "supported.");
1211                         break;
1212                 case Opt_noquota:
1213                         break;
1214 #endif
1215                 case Opt_abort:
1216                         set_opt(sbi->s_mount_opt, ABORT);
1217                         break;
1218                 case Opt_barrier:
1219                         if (match_int(&args[0], &option))
1220                                 return 0;
1221                         if (option)
1222                                 set_opt(sbi->s_mount_opt, BARRIER);
1223                         else
1224                                 clear_opt(sbi->s_mount_opt, BARRIER);
1225                         break;
1226                 case Opt_ignore:
1227                         break;
1228                 case Opt_resize:
1229                         if (!is_remount) {
1230                                 ext3_msg(sb, KERN_ERR,
1231                                         "error: resize option only available "
1232                                         "for remount");
1233                                 return 0;
1234                         }
1235                         if (match_int(&args[0], &option) != 0)
1236                                 return 0;
1237                         *n_blocks_count = option;
1238                         break;
1239                 case Opt_nobh:
1240                         set_opt(sbi->s_mount_opt, NOBH);
1241                         break;
1242                 case Opt_bh:
1243                         clear_opt(sbi->s_mount_opt, NOBH);
1244                         break;
1245                 default:
1246                         ext3_msg(sb, KERN_ERR,
1247                                 "error: unrecognized mount option \"%s\" "
1248                                 "or missing value", p);
1249                         return 0;
1250                 }
1251         }
1252 #ifdef CONFIG_QUOTA
1253         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1254                 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1255                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1256                 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1257                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1258
1259                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1260                         ext3_msg(sb, KERN_ERR, "error: old and new quota "
1261                                         "format mixing.");
1262                         return 0;
1263                 }
1264
1265                 if (!sbi->s_jquota_fmt) {
1266                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1267                                         "not specified.");
1268                         return 0;
1269                 }
1270         } else {
1271                 if (sbi->s_jquota_fmt) {
1272                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1273                                         "specified with no journaling "
1274                                         "enabled.");
1275                         return 0;
1276                 }
1277         }
1278 #endif
1279         return 1;
1280 }
1281
1282 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1283                             int read_only)
1284 {
1285         struct ext3_sb_info *sbi = EXT3_SB(sb);
1286         int res = 0;
1287
1288         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1289                 ext3_msg(sb, KERN_ERR,
1290                         "error: revision level too high, "
1291                         "forcing read-only mode");
1292                 res = MS_RDONLY;
1293         }
1294         if (read_only)
1295                 return res;
1296         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1297                 ext3_msg(sb, KERN_WARNING,
1298                         "warning: mounting unchecked fs, "
1299                         "running e2fsck is recommended");
1300         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1301                 ext3_msg(sb, KERN_WARNING,
1302                         "warning: mounting fs with errors, "
1303                         "running e2fsck is recommended");
1304         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1305                  le16_to_cpu(es->s_mnt_count) >=
1306                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1307                 ext3_msg(sb, KERN_WARNING,
1308                         "warning: maximal mount count reached, "
1309                         "running e2fsck is recommended");
1310         else if (le32_to_cpu(es->s_checkinterval) &&
1311                 (le32_to_cpu(es->s_lastcheck) +
1312                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1313                 ext3_msg(sb, KERN_WARNING,
1314                         "warning: checktime reached, "
1315                         "running e2fsck is recommended");
1316 #if 0
1317                 /* @@@ We _will_ want to clear the valid bit if we find
1318                    inconsistencies, to force a fsck at reboot.  But for
1319                    a plain journaled filesystem we can keep it set as
1320                    valid forever! :) */
1321         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1322 #endif
1323         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1324                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1325         le16_add_cpu(&es->s_mnt_count, 1);
1326         es->s_mtime = cpu_to_le32(get_seconds());
1327         ext3_update_dynamic_rev(sb);
1328         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1329
1330         ext3_commit_super(sb, es, 1);
1331         if (test_opt(sb, DEBUG))
1332                 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1333                                 "bpg=%lu, ipg=%lu, mo=%04lx]",
1334                         sb->s_blocksize,
1335                         sbi->s_groups_count,
1336                         EXT3_BLOCKS_PER_GROUP(sb),
1337                         EXT3_INODES_PER_GROUP(sb),
1338                         sbi->s_mount_opt);
1339
1340         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1341                 char b[BDEVNAME_SIZE];
1342                 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1343                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1344         } else {
1345                 ext3_msg(sb, KERN_INFO, "using internal journal");
1346         }
1347         return res;
1348 }
1349
1350 /* Called at mount-time, super-block is locked */
1351 static int ext3_check_descriptors(struct super_block *sb)
1352 {
1353         struct ext3_sb_info *sbi = EXT3_SB(sb);
1354         int i;
1355
1356         ext3_debug ("Checking group descriptors");
1357
1358         for (i = 0; i < sbi->s_groups_count; i++) {
1359                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1360                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1361                 ext3_fsblk_t last_block;
1362
1363                 if (i == sbi->s_groups_count - 1)
1364                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1365                 else
1366                         last_block = first_block +
1367                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1368
1369                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1370                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1371                 {
1372                         ext3_error (sb, "ext3_check_descriptors",
1373                                     "Block bitmap for group %d"
1374                                     " not in group (block %lu)!",
1375                                     i, (unsigned long)
1376                                         le32_to_cpu(gdp->bg_block_bitmap));
1377                         return 0;
1378                 }
1379                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1380                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1381                 {
1382                         ext3_error (sb, "ext3_check_descriptors",
1383                                     "Inode bitmap for group %d"
1384                                     " not in group (block %lu)!",
1385                                     i, (unsigned long)
1386                                         le32_to_cpu(gdp->bg_inode_bitmap));
1387                         return 0;
1388                 }
1389                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1390                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1391                     last_block)
1392                 {
1393                         ext3_error (sb, "ext3_check_descriptors",
1394                                     "Inode table for group %d"
1395                                     " not in group (block %lu)!",
1396                                     i, (unsigned long)
1397                                         le32_to_cpu(gdp->bg_inode_table));
1398                         return 0;
1399                 }
1400         }
1401
1402         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1403         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1404         return 1;
1405 }
1406
1407
1408 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1409  * the superblock) which were deleted from all directories, but held open by
1410  * a process at the time of a crash.  We walk the list and try to delete these
1411  * inodes at recovery time (only with a read-write filesystem).
1412  *
1413  * In order to keep the orphan inode chain consistent during traversal (in
1414  * case of crash during recovery), we link each inode into the superblock
1415  * orphan list_head and handle it the same way as an inode deletion during
1416  * normal operation (which journals the operations for us).
1417  *
1418  * We only do an iget() and an iput() on each inode, which is very safe if we
1419  * accidentally point at an in-use or already deleted inode.  The worst that
1420  * can happen in this case is that we get a "bit already cleared" message from
1421  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1422  * e2fsck was run on this filesystem, and it must have already done the orphan
1423  * inode cleanup for us, so we can safely abort without any further action.
1424  */
1425 static void ext3_orphan_cleanup (struct super_block * sb,
1426                                  struct ext3_super_block * es)
1427 {
1428         unsigned int s_flags = sb->s_flags;
1429         int nr_orphans = 0, nr_truncates = 0;
1430 #ifdef CONFIG_QUOTA
1431         int i;
1432 #endif
1433         if (!es->s_last_orphan) {
1434                 jbd_debug(4, "no orphan inodes to clean up\n");
1435                 return;
1436         }
1437
1438         if (bdev_read_only(sb->s_bdev)) {
1439                 ext3_msg(sb, KERN_ERR, "error: write access "
1440                         "unavailable, skipping orphan cleanup.");
1441                 return;
1442         }
1443
1444         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1445                 if (es->s_last_orphan)
1446                         jbd_debug(1, "Errors on filesystem, "
1447                                   "clearing orphan list.\n");
1448                 es->s_last_orphan = 0;
1449                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1450                 return;
1451         }
1452
1453         if (s_flags & MS_RDONLY) {
1454                 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1455                 sb->s_flags &= ~MS_RDONLY;
1456         }
1457 #ifdef CONFIG_QUOTA
1458         /* Needed for iput() to work correctly and not trash data */
1459         sb->s_flags |= MS_ACTIVE;
1460         /* Turn on quotas so that they are updated correctly */
1461         for (i = 0; i < MAXQUOTAS; i++) {
1462                 if (EXT3_SB(sb)->s_qf_names[i]) {
1463                         int ret = ext3_quota_on_mount(sb, i);
1464                         if (ret < 0)
1465                                 ext3_msg(sb, KERN_ERR,
1466                                         "error: cannot turn on journaled "
1467                                         "quota: %d", ret);
1468                 }
1469         }
1470 #endif
1471
1472         while (es->s_last_orphan) {
1473                 struct inode *inode;
1474
1475                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1476                 if (IS_ERR(inode)) {
1477                         es->s_last_orphan = 0;
1478                         break;
1479                 }
1480
1481                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1482                 vfs_dq_init(inode);
1483                 if (inode->i_nlink) {
1484                         printk(KERN_DEBUG
1485                                 "%s: truncating inode %lu to %Ld bytes\n",
1486                                 __func__, inode->i_ino, inode->i_size);
1487                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1488                                   inode->i_ino, inode->i_size);
1489                         ext3_truncate(inode);
1490                         nr_truncates++;
1491                 } else {
1492                         printk(KERN_DEBUG
1493                                 "%s: deleting unreferenced inode %lu\n",
1494                                 __func__, inode->i_ino);
1495                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1496                                   inode->i_ino);
1497                         nr_orphans++;
1498                 }
1499                 iput(inode);  /* The delete magic happens here! */
1500         }
1501
1502 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1503
1504         if (nr_orphans)
1505                 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1506                        PLURAL(nr_orphans));
1507         if (nr_truncates)
1508                 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1509                        PLURAL(nr_truncates));
1510 #ifdef CONFIG_QUOTA
1511         /* Turn quotas off */
1512         for (i = 0; i < MAXQUOTAS; i++) {
1513                 if (sb_dqopt(sb)->files[i])
1514                         vfs_quota_off(sb, i, 0);
1515         }
1516 #endif
1517         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1518 }
1519
1520 /*
1521  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1522  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1523  * We need to be 1 filesystem block less than the 2^32 sector limit.
1524  */
1525 static loff_t ext3_max_size(int bits)
1526 {
1527         loff_t res = EXT3_NDIR_BLOCKS;
1528         int meta_blocks;
1529         loff_t upper_limit;
1530
1531         /* This is calculated to be the largest file size for a
1532          * dense, file such that the total number of
1533          * sectors in the file, including data and all indirect blocks,
1534          * does not exceed 2^32 -1
1535          * __u32 i_blocks representing the total number of
1536          * 512 bytes blocks of the file
1537          */
1538         upper_limit = (1LL << 32) - 1;
1539
1540         /* total blocks in file system block size */
1541         upper_limit >>= (bits - 9);
1542
1543
1544         /* indirect blocks */
1545         meta_blocks = 1;
1546         /* double indirect blocks */
1547         meta_blocks += 1 + (1LL << (bits-2));
1548         /* tripple indirect blocks */
1549         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1550
1551         upper_limit -= meta_blocks;
1552         upper_limit <<= bits;
1553
1554         res += 1LL << (bits-2);
1555         res += 1LL << (2*(bits-2));
1556         res += 1LL << (3*(bits-2));
1557         res <<= bits;
1558         if (res > upper_limit)
1559                 res = upper_limit;
1560
1561         if (res > MAX_LFS_FILESIZE)
1562                 res = MAX_LFS_FILESIZE;
1563
1564         return res;
1565 }
1566
1567 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1568                                     ext3_fsblk_t logic_sb_block,
1569                                     int nr)
1570 {
1571         struct ext3_sb_info *sbi = EXT3_SB(sb);
1572         unsigned long bg, first_meta_bg;
1573         int has_super = 0;
1574
1575         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1576
1577         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1578             nr < first_meta_bg)
1579                 return (logic_sb_block + nr + 1);
1580         bg = sbi->s_desc_per_block * nr;
1581         if (ext3_bg_has_super(sb, bg))
1582                 has_super = 1;
1583         return (has_super + ext3_group_first_block_no(sb, bg));
1584 }
1585
1586
1587 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1588 {
1589         struct buffer_head * bh;
1590         struct ext3_super_block *es = NULL;
1591         struct ext3_sb_info *sbi;
1592         ext3_fsblk_t block;
1593         ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1594         ext3_fsblk_t logic_sb_block;
1595         unsigned long offset = 0;
1596         unsigned int journal_inum = 0;
1597         unsigned long journal_devnum = 0;
1598         unsigned long def_mount_opts;
1599         struct inode *root;
1600         int blocksize;
1601         int hblock;
1602         int db_count;
1603         int i;
1604         int needs_recovery;
1605         int ret = -EINVAL;
1606         __le32 features;
1607         int err;
1608
1609         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1610         if (!sbi)
1611                 return -ENOMEM;
1612
1613         sbi->s_blockgroup_lock =
1614                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1615         if (!sbi->s_blockgroup_lock) {
1616                 kfree(sbi);
1617                 return -ENOMEM;
1618         }
1619         sb->s_fs_info = sbi;
1620         sbi->s_mount_opt = 0;
1621         sbi->s_resuid = EXT3_DEF_RESUID;
1622         sbi->s_resgid = EXT3_DEF_RESGID;
1623         sbi->s_sb_block = sb_block;
1624
1625         unlock_kernel();
1626
1627         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1628         if (!blocksize) {
1629                 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1630                 goto out_fail;
1631         }
1632
1633         /*
1634          * The ext3 superblock will not be buffer aligned for other than 1kB
1635          * block sizes.  We need to calculate the offset from buffer start.
1636          */
1637         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1638                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1639                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1640         } else {
1641                 logic_sb_block = sb_block;
1642         }
1643
1644         if (!(bh = sb_bread(sb, logic_sb_block))) {
1645                 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1646                 goto out_fail;
1647         }
1648         /*
1649          * Note: s_es must be initialized as soon as possible because
1650          *       some ext3 macro-instructions depend on its value
1651          */
1652         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1653         sbi->s_es = es;
1654         sb->s_magic = le16_to_cpu(es->s_magic);
1655         if (sb->s_magic != EXT3_SUPER_MAGIC)
1656                 goto cantfind_ext3;
1657
1658         /* Set defaults before we parse the mount options */
1659         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1660         if (def_mount_opts & EXT3_DEFM_DEBUG)
1661                 set_opt(sbi->s_mount_opt, DEBUG);
1662         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1663                 set_opt(sbi->s_mount_opt, GRPID);
1664         if (def_mount_opts & EXT3_DEFM_UID16)
1665                 set_opt(sbi->s_mount_opt, NO_UID32);
1666 #ifdef CONFIG_EXT3_FS_XATTR
1667         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1668                 set_opt(sbi->s_mount_opt, XATTR_USER);
1669 #endif
1670 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1671         if (def_mount_opts & EXT3_DEFM_ACL)
1672                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1673 #endif
1674         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1675                 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1676         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1677                 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1678         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1679                 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1680
1681         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1682                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1683         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1684                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1685         else
1686                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1687
1688         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1689         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1690
1691         set_opt(sbi->s_mount_opt, RESERVATION);
1692
1693         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1694                             NULL, 0))
1695                 goto failed_mount;
1696
1697         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1698                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1699
1700         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1701             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1702              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1703              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1704                 ext3_msg(sb, KERN_WARNING,
1705                         "warning: feature flags set on rev 0 fs, "
1706                         "running e2fsck is recommended");
1707         /*
1708          * Check feature flags regardless of the revision level, since we
1709          * previously didn't change the revision level when setting the flags,
1710          * so there is a chance incompat flags are set on a rev 0 filesystem.
1711          */
1712         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1713         if (features) {
1714                 ext3_msg(sb, KERN_ERR,
1715                         "error: couldn't mount because of unsupported "
1716                         "optional features (%x)", le32_to_cpu(features));
1717                 goto failed_mount;
1718         }
1719         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1720         if (!(sb->s_flags & MS_RDONLY) && features) {
1721                 ext3_msg(sb, KERN_ERR,
1722                         "error: couldn't mount RDWR because of unsupported "
1723                         "optional features (%x)", le32_to_cpu(features));
1724                 goto failed_mount;
1725         }
1726         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1727
1728         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1729             blocksize > EXT3_MAX_BLOCK_SIZE) {
1730                 ext3_msg(sb, KERN_ERR,
1731                         "error: couldn't mount because of unsupported "
1732                         "filesystem blocksize %d", blocksize);
1733                 goto failed_mount;
1734         }
1735
1736         hblock = bdev_logical_block_size(sb->s_bdev);
1737         if (sb->s_blocksize != blocksize) {
1738                 /*
1739                  * Make sure the blocksize for the filesystem is larger
1740                  * than the hardware sectorsize for the machine.
1741                  */
1742                 if (blocksize < hblock) {
1743                         ext3_msg(sb, KERN_ERR,
1744                                 "error: fsblocksize %d too small for "
1745                                 "hardware sectorsize %d", blocksize, hblock);
1746                         goto failed_mount;
1747                 }
1748
1749                 brelse (bh);
1750                 if (!sb_set_blocksize(sb, blocksize)) {
1751                         ext3_msg(sb, KERN_ERR,
1752                                 "error: bad blocksize %d", blocksize);
1753                         goto out_fail;
1754                 }
1755                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1756                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1757                 bh = sb_bread(sb, logic_sb_block);
1758                 if (!bh) {
1759                         ext3_msg(sb, KERN_ERR,
1760                                "error: can't read superblock on 2nd try");
1761                         goto failed_mount;
1762                 }
1763                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1764                 sbi->s_es = es;
1765                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1766                         ext3_msg(sb, KERN_ERR,
1767                                 "error: magic mismatch");
1768                         goto failed_mount;
1769                 }
1770         }
1771
1772         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1773
1774         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1775                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1776                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1777         } else {
1778                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1779                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1780                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1781                     (!is_power_of_2(sbi->s_inode_size)) ||
1782                     (sbi->s_inode_size > blocksize)) {
1783                         ext3_msg(sb, KERN_ERR,
1784                                 "error: unsupported inode size: %d",
1785                                 sbi->s_inode_size);
1786                         goto failed_mount;
1787                 }
1788         }
1789         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1790                                    le32_to_cpu(es->s_log_frag_size);
1791         if (blocksize != sbi->s_frag_size) {
1792                 ext3_msg(sb, KERN_ERR,
1793                        "error: fragsize %lu != blocksize %u (unsupported)",
1794                        sbi->s_frag_size, blocksize);
1795                 goto failed_mount;
1796         }
1797         sbi->s_frags_per_block = 1;
1798         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1799         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1800         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1801         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1802                 goto cantfind_ext3;
1803         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1804         if (sbi->s_inodes_per_block == 0)
1805                 goto cantfind_ext3;
1806         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1807                                         sbi->s_inodes_per_block;
1808         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1809         sbi->s_sbh = bh;
1810         sbi->s_mount_state = le16_to_cpu(es->s_state);
1811         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1812         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1813         for (i=0; i < 4; i++)
1814                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1815         sbi->s_def_hash_version = es->s_def_hash_version;
1816         i = le32_to_cpu(es->s_flags);
1817         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1818                 sbi->s_hash_unsigned = 3;
1819         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1820 #ifdef __CHAR_UNSIGNED__
1821                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1822                 sbi->s_hash_unsigned = 3;
1823 #else
1824                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1825 #endif
1826         }
1827
1828         if (sbi->s_blocks_per_group > blocksize * 8) {
1829                 ext3_msg(sb, KERN_ERR,
1830                         "#blocks per group too big: %lu",
1831                         sbi->s_blocks_per_group);
1832                 goto failed_mount;
1833         }
1834         if (sbi->s_frags_per_group > blocksize * 8) {
1835                 ext3_msg(sb, KERN_ERR,
1836                         "error: #fragments per group too big: %lu",
1837                         sbi->s_frags_per_group);
1838                 goto failed_mount;
1839         }
1840         if (sbi->s_inodes_per_group > blocksize * 8) {
1841                 ext3_msg(sb, KERN_ERR,
1842                         "error: #inodes per group too big: %lu",
1843                         sbi->s_inodes_per_group);
1844                 goto failed_mount;
1845         }
1846
1847         if (le32_to_cpu(es->s_blocks_count) >
1848                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1849                 ext3_msg(sb, KERN_ERR,
1850                         "error: filesystem is too large to mount safely");
1851                 if (sizeof(sector_t) < 8)
1852                         ext3_msg(sb, KERN_ERR,
1853                                 "error: CONFIG_LBDAF not enabled");
1854                 goto failed_mount;
1855         }
1856
1857         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1858                 goto cantfind_ext3;
1859         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1860                                le32_to_cpu(es->s_first_data_block) - 1)
1861                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1862         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1863                    EXT3_DESC_PER_BLOCK(sb);
1864         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1865                                     GFP_KERNEL);
1866         if (sbi->s_group_desc == NULL) {
1867                 ext3_msg(sb, KERN_ERR,
1868                         "error: not enough memory");
1869                 goto failed_mount;
1870         }
1871
1872         bgl_lock_init(sbi->s_blockgroup_lock);
1873
1874         for (i = 0; i < db_count; i++) {
1875                 block = descriptor_loc(sb, logic_sb_block, i);
1876                 sbi->s_group_desc[i] = sb_bread(sb, block);
1877                 if (!sbi->s_group_desc[i]) {
1878                         ext3_msg(sb, KERN_ERR,
1879                                 "error: can't read group descriptor %d", i);
1880                         db_count = i;
1881                         goto failed_mount2;
1882                 }
1883         }
1884         if (!ext3_check_descriptors (sb)) {
1885                 ext3_msg(sb, KERN_ERR,
1886                         "error: group descriptors corrupted");
1887                 goto failed_mount2;
1888         }
1889         sbi->s_gdb_count = db_count;
1890         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1891         spin_lock_init(&sbi->s_next_gen_lock);
1892
1893         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1894                         ext3_count_free_blocks(sb));
1895         if (!err) {
1896                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1897                                 ext3_count_free_inodes(sb));
1898         }
1899         if (!err) {
1900                 err = percpu_counter_init(&sbi->s_dirs_counter,
1901                                 ext3_count_dirs(sb));
1902         }
1903         if (err) {
1904                 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
1905                 goto failed_mount3;
1906         }
1907
1908         /* per fileystem reservation list head & lock */
1909         spin_lock_init(&sbi->s_rsv_window_lock);
1910         sbi->s_rsv_window_root = RB_ROOT;
1911         /* Add a single, static dummy reservation to the start of the
1912          * reservation window list --- it gives us a placeholder for
1913          * append-at-start-of-list which makes the allocation logic
1914          * _much_ simpler. */
1915         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1916         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1917         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1918         sbi->s_rsv_window_head.rsv_goal_size = 0;
1919         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1920
1921         /*
1922          * set up enough so that it can read an inode
1923          */
1924         sb->s_op = &ext3_sops;
1925         sb->s_export_op = &ext3_export_ops;
1926         sb->s_xattr = ext3_xattr_handlers;
1927 #ifdef CONFIG_QUOTA
1928         sb->s_qcop = &ext3_qctl_operations;
1929         sb->dq_op = &ext3_quota_operations;
1930 #endif
1931         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1932         mutex_init(&sbi->s_orphan_lock);
1933         mutex_init(&sbi->s_resize_lock);
1934
1935         sb->s_root = NULL;
1936
1937         needs_recovery = (es->s_last_orphan != 0 ||
1938                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1939                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1940
1941         /*
1942          * The first inode we look at is the journal inode.  Don't try
1943          * root first: it may be modified in the journal!
1944          */
1945         if (!test_opt(sb, NOLOAD) &&
1946             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1947                 if (ext3_load_journal(sb, es, journal_devnum))
1948                         goto failed_mount3;
1949         } else if (journal_inum) {
1950                 if (ext3_create_journal(sb, es, journal_inum))
1951                         goto failed_mount3;
1952         } else {
1953                 if (!silent)
1954                         ext3_msg(sb, KERN_ERR,
1955                                 "error: no journal found. "
1956                                 "mounting ext3 over ext2?");
1957                 goto failed_mount3;
1958         }
1959
1960         /* We have now updated the journal if required, so we can
1961          * validate the data journaling mode. */
1962         switch (test_opt(sb, DATA_FLAGS)) {
1963         case 0:
1964                 /* No mode set, assume a default based on the journal
1965                    capabilities: ORDERED_DATA if the journal can
1966                    cope, else JOURNAL_DATA */
1967                 if (journal_check_available_features
1968                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1969                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1970                 else
1971                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1972                 break;
1973
1974         case EXT3_MOUNT_ORDERED_DATA:
1975         case EXT3_MOUNT_WRITEBACK_DATA:
1976                 if (!journal_check_available_features
1977                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1978                         ext3_msg(sb, KERN_ERR,
1979                                 "error: journal does not support "
1980                                 "requested data journaling mode");
1981                         goto failed_mount4;
1982                 }
1983         default:
1984                 break;
1985         }
1986
1987         if (test_opt(sb, NOBH)) {
1988                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1989                         ext3_msg(sb, KERN_WARNING,
1990                                 "warning: ignoring nobh option - "
1991                                 "it is supported only with writeback mode");
1992                         clear_opt(sbi->s_mount_opt, NOBH);
1993                 }
1994         }
1995         /*
1996          * The journal_load will have done any necessary log recovery,
1997          * so we can safely mount the rest of the filesystem now.
1998          */
1999
2000         root = ext3_iget(sb, EXT3_ROOT_INO);
2001         if (IS_ERR(root)) {
2002                 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2003                 ret = PTR_ERR(root);
2004                 goto failed_mount4;
2005         }
2006         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2007                 iput(root);
2008                 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2009                 goto failed_mount4;
2010         }
2011         sb->s_root = d_alloc_root(root);
2012         if (!sb->s_root) {
2013                 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2014                 iput(root);
2015                 ret = -ENOMEM;
2016                 goto failed_mount4;
2017         }
2018
2019         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2020
2021         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2022         ext3_orphan_cleanup(sb, es);
2023         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2024         if (needs_recovery)
2025                 ext3_msg(sb, KERN_INFO, "recovery complete");
2026         ext3_mark_recovery_complete(sb, es);
2027         ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2028                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2029                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2030                 "writeback");
2031
2032         lock_kernel();
2033         return 0;
2034
2035 cantfind_ext3:
2036         if (!silent)
2037                 ext3_msg(sb, KERN_INFO,
2038                         "error: can't find ext3 filesystem on dev %s.",
2039                        sb->s_id);
2040         goto failed_mount;
2041
2042 failed_mount4:
2043         journal_destroy(sbi->s_journal);
2044 failed_mount3:
2045         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2046         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2047         percpu_counter_destroy(&sbi->s_dirs_counter);
2048 failed_mount2:
2049         for (i = 0; i < db_count; i++)
2050                 brelse(sbi->s_group_desc[i]);
2051         kfree(sbi->s_group_desc);
2052 failed_mount:
2053 #ifdef CONFIG_QUOTA
2054         for (i = 0; i < MAXQUOTAS; i++)
2055                 kfree(sbi->s_qf_names[i]);
2056 #endif
2057         ext3_blkdev_remove(sbi);
2058         brelse(bh);
2059 out_fail:
2060         sb->s_fs_info = NULL;
2061         kfree(sbi->s_blockgroup_lock);
2062         kfree(sbi);
2063         lock_kernel();
2064         return ret;
2065 }
2066
2067 /*
2068  * Setup any per-fs journal parameters now.  We'll do this both on
2069  * initial mount, once the journal has been initialised but before we've
2070  * done any recovery; and again on any subsequent remount.
2071  */
2072 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2073 {
2074         struct ext3_sb_info *sbi = EXT3_SB(sb);
2075
2076         if (sbi->s_commit_interval)
2077                 journal->j_commit_interval = sbi->s_commit_interval;
2078         /* We could also set up an ext3-specific default for the commit
2079          * interval here, but for now we'll just fall back to the jbd
2080          * default. */
2081
2082         spin_lock(&journal->j_state_lock);
2083         if (test_opt(sb, BARRIER))
2084                 journal->j_flags |= JFS_BARRIER;
2085         else
2086                 journal->j_flags &= ~JFS_BARRIER;
2087         if (test_opt(sb, DATA_ERR_ABORT))
2088                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2089         else
2090                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2091         spin_unlock(&journal->j_state_lock);
2092 }
2093
2094 static journal_t *ext3_get_journal(struct super_block *sb,
2095                                    unsigned int journal_inum)
2096 {
2097         struct inode *journal_inode;
2098         journal_t *journal;
2099
2100         /* First, test for the existence of a valid inode on disk.  Bad
2101          * things happen if we iget() an unused inode, as the subsequent
2102          * iput() will try to delete it. */
2103
2104         journal_inode = ext3_iget(sb, journal_inum);
2105         if (IS_ERR(journal_inode)) {
2106                 ext3_msg(sb, KERN_ERR, "error: no journal found");
2107                 return NULL;
2108         }
2109         if (!journal_inode->i_nlink) {
2110                 make_bad_inode(journal_inode);
2111                 iput(journal_inode);
2112                 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2113                 return NULL;
2114         }
2115
2116         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2117                   journal_inode, journal_inode->i_size);
2118         if (!S_ISREG(journal_inode->i_mode)) {
2119                 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2120                 iput(journal_inode);
2121                 return NULL;
2122         }
2123
2124         journal = journal_init_inode(journal_inode);
2125         if (!journal) {
2126                 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2127                 iput(journal_inode);
2128                 return NULL;
2129         }
2130         journal->j_private = sb;
2131         ext3_init_journal_params(sb, journal);
2132         return journal;
2133 }
2134
2135 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2136                                        dev_t j_dev)
2137 {
2138         struct buffer_head * bh;
2139         journal_t *journal;
2140         ext3_fsblk_t start;
2141         ext3_fsblk_t len;
2142         int hblock, blocksize;
2143         ext3_fsblk_t sb_block;
2144         unsigned long offset;
2145         struct ext3_super_block * es;
2146         struct block_device *bdev;
2147
2148         bdev = ext3_blkdev_get(j_dev, sb);
2149         if (bdev == NULL)
2150                 return NULL;
2151
2152         if (bd_claim(bdev, sb)) {
2153                 ext3_msg(sb, KERN_ERR,
2154                         "error: failed to claim external journal device");
2155                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2156                 return NULL;
2157         }
2158
2159         blocksize = sb->s_blocksize;
2160         hblock = bdev_logical_block_size(bdev);
2161         if (blocksize < hblock) {
2162                 ext3_msg(sb, KERN_ERR,
2163                         "error: blocksize too small for journal device");
2164                 goto out_bdev;
2165         }
2166
2167         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2168         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2169         set_blocksize(bdev, blocksize);
2170         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2171                 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2172                         "external journal");
2173                 goto out_bdev;
2174         }
2175
2176         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2177         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2178             !(le32_to_cpu(es->s_feature_incompat) &
2179               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2180                 ext3_msg(sb, KERN_ERR, "error: external journal has "
2181                         "bad superblock");
2182                 brelse(bh);
2183                 goto out_bdev;
2184         }
2185
2186         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2187                 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2188                 brelse(bh);
2189                 goto out_bdev;
2190         }
2191
2192         len = le32_to_cpu(es->s_blocks_count);
2193         start = sb_block + 1;
2194         brelse(bh);     /* we're done with the superblock */
2195
2196         journal = journal_init_dev(bdev, sb->s_bdev,
2197                                         start, len, blocksize);
2198         if (!journal) {
2199                 ext3_msg(sb, KERN_ERR,
2200                         "error: failed to create device journal");
2201                 goto out_bdev;
2202         }
2203         journal->j_private = sb;
2204         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2205         wait_on_buffer(journal->j_sb_buffer);
2206         if (!buffer_uptodate(journal->j_sb_buffer)) {
2207                 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2208                 goto out_journal;
2209         }
2210         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2211                 ext3_msg(sb, KERN_ERR,
2212                         "error: external journal has more than one "
2213                         "user (unsupported) - %d",
2214                         be32_to_cpu(journal->j_superblock->s_nr_users));
2215                 goto out_journal;
2216         }
2217         EXT3_SB(sb)->journal_bdev = bdev;
2218         ext3_init_journal_params(sb, journal);
2219         return journal;
2220 out_journal:
2221         journal_destroy(journal);
2222 out_bdev:
2223         ext3_blkdev_put(bdev);
2224         return NULL;
2225 }
2226
2227 static int ext3_load_journal(struct super_block *sb,
2228                              struct ext3_super_block *es,
2229                              unsigned long journal_devnum)
2230 {
2231         journal_t *journal;
2232         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2233         dev_t journal_dev;
2234         int err = 0;
2235         int really_read_only;
2236
2237         if (journal_devnum &&
2238             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2239                 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2240                         "numbers have changed");
2241                 journal_dev = new_decode_dev(journal_devnum);
2242         } else
2243                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2244
2245         really_read_only = bdev_read_only(sb->s_bdev);
2246
2247         /*
2248          * Are we loading a blank journal or performing recovery after a
2249          * crash?  For recovery, we need to check in advance whether we
2250          * can get read-write access to the device.
2251          */
2252
2253         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2254                 if (sb->s_flags & MS_RDONLY) {
2255                         ext3_msg(sb, KERN_INFO,
2256                                 "recovery required on readonly filesystem");
2257                         if (really_read_only) {
2258                                 ext3_msg(sb, KERN_ERR, "error: write access "
2259                                         "unavailable, cannot proceed");
2260                                 return -EROFS;
2261                         }
2262                         ext3_msg(sb, KERN_INFO,
2263                                 "write access will be enabled during recovery");
2264                 }
2265         }
2266
2267         if (journal_inum && journal_dev) {
2268                 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2269                        "and inode journals");
2270                 return -EINVAL;
2271         }
2272
2273         if (journal_inum) {
2274                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2275                         return -EINVAL;
2276         } else {
2277                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2278                         return -EINVAL;
2279         }
2280
2281         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2282                 err = journal_update_format(journal);
2283                 if (err)  {
2284                         ext3_msg(sb, KERN_ERR, "error updating journal");
2285                         journal_destroy(journal);
2286                         return err;
2287                 }
2288         }
2289
2290         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2291                 err = journal_wipe(journal, !really_read_only);
2292         if (!err)
2293                 err = journal_load(journal);
2294
2295         if (err) {
2296                 ext3_msg(sb, KERN_ERR, "error loading journal");
2297                 journal_destroy(journal);
2298                 return err;
2299         }
2300
2301         EXT3_SB(sb)->s_journal = journal;
2302         ext3_clear_journal_err(sb, es);
2303
2304         if (journal_devnum &&
2305             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2306                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2307
2308                 /* Make sure we flush the recovery flag to disk. */
2309                 ext3_commit_super(sb, es, 1);
2310         }
2311
2312         return 0;
2313 }
2314
2315 static int ext3_create_journal(struct super_block *sb,
2316                                struct ext3_super_block *es,
2317                                unsigned int journal_inum)
2318 {
2319         journal_t *journal;
2320         int err;
2321
2322         if (sb->s_flags & MS_RDONLY) {
2323                 ext3_msg(sb, KERN_ERR,
2324                         "error: readonly filesystem when trying to "
2325                         "create journal");
2326                 return -EROFS;
2327         }
2328
2329         journal = ext3_get_journal(sb, journal_inum);
2330         if (!journal)
2331                 return -EINVAL;
2332
2333         ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2334                journal_inum);
2335
2336         err = journal_create(journal);
2337         if (err) {
2338                 ext3_msg(sb, KERN_ERR, "error creating journal");
2339                 journal_destroy(journal);
2340                 return -EIO;
2341         }
2342
2343         EXT3_SB(sb)->s_journal = journal;
2344
2345         ext3_update_dynamic_rev(sb);
2346         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2347         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2348
2349         es->s_journal_inum = cpu_to_le32(journal_inum);
2350
2351         /* Make sure we flush the recovery flag to disk. */
2352         ext3_commit_super(sb, es, 1);
2353
2354         return 0;
2355 }
2356
2357 static int ext3_commit_super(struct super_block *sb,
2358                                struct ext3_super_block *es,
2359                                int sync)
2360 {
2361         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2362         int error = 0;
2363
2364         if (!sbh)
2365                 return error;
2366         /*
2367          * If the file system is mounted read-only, don't update the
2368          * superblock write time.  This avoids updating the superblock
2369          * write time when we are mounting the root file system
2370          * read/only but we need to replay the journal; at that point,
2371          * for people who are east of GMT and who make their clock
2372          * tick in localtime for Windows bug-for-bug compatibility,
2373          * the clock is set in the future, and this will cause e2fsck
2374          * to complain and force a full file system check.
2375          */
2376         if (!(sb->s_flags & MS_RDONLY))
2377                 es->s_wtime = cpu_to_le32(get_seconds());
2378         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2379         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2380         BUFFER_TRACE(sbh, "marking dirty");
2381         mark_buffer_dirty(sbh);
2382         if (sync)
2383                 error = sync_dirty_buffer(sbh);
2384         return error;
2385 }
2386
2387
2388 /*
2389  * Have we just finished recovery?  If so, and if we are mounting (or
2390  * remounting) the filesystem readonly, then we will end up with a
2391  * consistent fs on disk.  Record that fact.
2392  */
2393 static void ext3_mark_recovery_complete(struct super_block * sb,
2394                                         struct ext3_super_block * es)
2395 {
2396         journal_t *journal = EXT3_SB(sb)->s_journal;
2397
2398         journal_lock_updates(journal);
2399         if (journal_flush(journal) < 0)
2400                 goto out;
2401
2402         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2403             sb->s_flags & MS_RDONLY) {
2404                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2405                 ext3_commit_super(sb, es, 1);
2406         }
2407
2408 out:
2409         journal_unlock_updates(journal);
2410 }
2411
2412 /*
2413  * If we are mounting (or read-write remounting) a filesystem whose journal
2414  * has recorded an error from a previous lifetime, move that error to the
2415  * main filesystem now.
2416  */
2417 static void ext3_clear_journal_err(struct super_block *sb,
2418                                    struct ext3_super_block *es)
2419 {
2420         journal_t *journal;
2421         int j_errno;
2422         const char *errstr;
2423
2424         journal = EXT3_SB(sb)->s_journal;
2425
2426         /*
2427          * Now check for any error status which may have been recorded in the
2428          * journal by a prior ext3_error() or ext3_abort()
2429          */
2430
2431         j_errno = journal_errno(journal);
2432         if (j_errno) {
2433                 char nbuf[16];
2434
2435                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2436                 ext3_warning(sb, __func__, "Filesystem error recorded "
2437                              "from previous mount: %s", errstr);
2438                 ext3_warning(sb, __func__, "Marking fs in need of "
2439                              "filesystem check.");
2440
2441                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2442                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2443                 ext3_commit_super (sb, es, 1);
2444
2445                 journal_clear_err(journal);
2446         }
2447 }
2448
2449 /*
2450  * Force the running and committing transactions to commit,
2451  * and wait on the commit.
2452  */
2453 int ext3_force_commit(struct super_block *sb)
2454 {
2455         journal_t *journal;
2456         int ret;
2457
2458         if (sb->s_flags & MS_RDONLY)
2459                 return 0;
2460
2461         journal = EXT3_SB(sb)->s_journal;
2462         ret = ext3_journal_force_commit(journal);
2463         return ret;
2464 }
2465
2466 static int ext3_sync_fs(struct super_block *sb, int wait)
2467 {
2468         tid_t target;
2469
2470         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2471                 if (wait)
2472                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2473         }
2474         return 0;
2475 }
2476
2477 /*
2478  * LVM calls this function before a (read-only) snapshot is created.  This
2479  * gives us a chance to flush the journal completely and mark the fs clean.
2480  */
2481 static int ext3_freeze(struct super_block *sb)
2482 {
2483         int error = 0;
2484         journal_t *journal;
2485
2486         if (!(sb->s_flags & MS_RDONLY)) {
2487                 journal = EXT3_SB(sb)->s_journal;
2488
2489                 /* Now we set up the journal barrier. */
2490                 journal_lock_updates(journal);
2491
2492                 /*
2493                  * We don't want to clear needs_recovery flag when we failed
2494                  * to flush the journal.
2495                  */
2496                 error = journal_flush(journal);
2497                 if (error < 0)
2498                         goto out;
2499
2500                 /* Journal blocked and flushed, clear needs_recovery flag. */
2501                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2502                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2503                 if (error)
2504                         goto out;
2505         }
2506         return 0;
2507
2508 out:
2509         journal_unlock_updates(journal);
2510         return error;
2511 }
2512
2513 /*
2514  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2515  * flag here, even though the filesystem is not technically dirty yet.
2516  */
2517 static int ext3_unfreeze(struct super_block *sb)
2518 {
2519         if (!(sb->s_flags & MS_RDONLY)) {
2520                 lock_super(sb);
2521                 /* Reser the needs_recovery flag before the fs is unlocked. */
2522                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2523                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2524                 unlock_super(sb);
2525                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2526         }
2527         return 0;
2528 }
2529
2530 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2531 {
2532         struct ext3_super_block * es;
2533         struct ext3_sb_info *sbi = EXT3_SB(sb);
2534         ext3_fsblk_t n_blocks_count = 0;
2535         unsigned long old_sb_flags;
2536         struct ext3_mount_options old_opts;
2537         int err;
2538 #ifdef CONFIG_QUOTA
2539         int i;
2540 #endif
2541
2542         lock_kernel();
2543
2544         /* Store the original options */
2545         lock_super(sb);
2546         old_sb_flags = sb->s_flags;
2547         old_opts.s_mount_opt = sbi->s_mount_opt;
2548         old_opts.s_resuid = sbi->s_resuid;
2549         old_opts.s_resgid = sbi->s_resgid;
2550         old_opts.s_commit_interval = sbi->s_commit_interval;
2551 #ifdef CONFIG_QUOTA
2552         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2553         for (i = 0; i < MAXQUOTAS; i++)
2554                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2555 #endif
2556
2557         /*
2558          * Allow the "check" option to be passed as a remount option.
2559          */
2560         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2561                 err = -EINVAL;
2562                 goto restore_opts;
2563         }
2564
2565         if (test_opt(sb, ABORT))
2566                 ext3_abort(sb, __func__, "Abort forced by user");
2567
2568         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2569                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2570
2571         es = sbi->s_es;
2572
2573         ext3_init_journal_params(sb, sbi->s_journal);
2574
2575         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2576                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2577                 if (test_opt(sb, ABORT)) {
2578                         err = -EROFS;
2579                         goto restore_opts;
2580                 }
2581
2582                 if (*flags & MS_RDONLY) {
2583                         /*
2584                          * First of all, the unconditional stuff we have to do
2585                          * to disable replay of the journal when we next remount
2586                          */
2587                         sb->s_flags |= MS_RDONLY;
2588
2589                         /*
2590                          * OK, test if we are remounting a valid rw partition
2591                          * readonly, and if so set the rdonly flag and then
2592                          * mark the partition as valid again.
2593                          */
2594                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2595                             (sbi->s_mount_state & EXT3_VALID_FS))
2596                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2597
2598                         ext3_mark_recovery_complete(sb, es);
2599                 } else {
2600                         __le32 ret;
2601                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2602                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2603                                 ext3_msg(sb, KERN_WARNING,
2604                                         "warning: couldn't remount RDWR "
2605                                         "because of unsupported optional "
2606                                         "features (%x)", le32_to_cpu(ret));
2607                                 err = -EROFS;
2608                                 goto restore_opts;
2609                         }
2610
2611                         /*
2612                          * If we have an unprocessed orphan list hanging
2613                          * around from a previously readonly bdev mount,
2614                          * require a full umount/remount for now.
2615                          */
2616                         if (es->s_last_orphan) {
2617                                 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2618                                        "remount RDWR because of unprocessed "
2619                                        "orphan inode list.  Please "
2620                                        "umount/remount instead.");
2621                                 err = -EINVAL;
2622                                 goto restore_opts;
2623                         }
2624
2625                         /*
2626                          * Mounting a RDONLY partition read-write, so reread
2627                          * and store the current valid flag.  (It may have
2628                          * been changed by e2fsck since we originally mounted
2629                          * the partition.)
2630                          */
2631                         ext3_clear_journal_err(sb, es);
2632                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2633                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2634                                 goto restore_opts;
2635                         if (!ext3_setup_super (sb, es, 0))
2636                                 sb->s_flags &= ~MS_RDONLY;
2637                 }
2638         }
2639 #ifdef CONFIG_QUOTA
2640         /* Release old quota file names */
2641         for (i = 0; i < MAXQUOTAS; i++)
2642                 if (old_opts.s_qf_names[i] &&
2643                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2644                         kfree(old_opts.s_qf_names[i]);
2645 #endif
2646         unlock_super(sb);
2647         unlock_kernel();
2648         return 0;
2649 restore_opts:
2650         sb->s_flags = old_sb_flags;
2651         sbi->s_mount_opt = old_opts.s_mount_opt;
2652         sbi->s_resuid = old_opts.s_resuid;
2653         sbi->s_resgid = old_opts.s_resgid;
2654         sbi->s_commit_interval = old_opts.s_commit_interval;
2655 #ifdef CONFIG_QUOTA
2656         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2657         for (i = 0; i < MAXQUOTAS; i++) {
2658                 if (sbi->s_qf_names[i] &&
2659                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2660                         kfree(sbi->s_qf_names[i]);
2661                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2662         }
2663 #endif
2664         unlock_super(sb);
2665         unlock_kernel();
2666         return err;
2667 }
2668
2669 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2670 {
2671         struct super_block *sb = dentry->d_sb;
2672         struct ext3_sb_info *sbi = EXT3_SB(sb);
2673         struct ext3_super_block *es = sbi->s_es;
2674         u64 fsid;
2675
2676         if (test_opt(sb, MINIX_DF)) {
2677                 sbi->s_overhead_last = 0;
2678         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2679                 unsigned long ngroups = sbi->s_groups_count, i;
2680                 ext3_fsblk_t overhead = 0;
2681                 smp_rmb();
2682
2683                 /*
2684                  * Compute the overhead (FS structures).  This is constant
2685                  * for a given filesystem unless the number of block groups
2686                  * changes so we cache the previous value until it does.
2687                  */
2688
2689                 /*
2690                  * All of the blocks before first_data_block are
2691                  * overhead
2692                  */
2693                 overhead = le32_to_cpu(es->s_first_data_block);
2694
2695                 /*
2696                  * Add the overhead attributed to the superblock and
2697                  * block group descriptors.  If the sparse superblocks
2698                  * feature is turned on, then not all groups have this.
2699                  */
2700                 for (i = 0; i < ngroups; i++) {
2701                         overhead += ext3_bg_has_super(sb, i) +
2702                                 ext3_bg_num_gdb(sb, i);
2703                         cond_resched();
2704                 }
2705
2706                 /*
2707                  * Every block group has an inode bitmap, a block
2708                  * bitmap, and an inode table.
2709                  */
2710                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2711                 sbi->s_overhead_last = overhead;
2712                 smp_wmb();
2713                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2714         }
2715
2716         buf->f_type = EXT3_SUPER_MAGIC;
2717         buf->f_bsize = sb->s_blocksize;
2718         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2719         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2720         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2721         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2722                 buf->f_bavail = 0;
2723         buf->f_files = le32_to_cpu(es->s_inodes_count);
2724         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2725         buf->f_namelen = EXT3_NAME_LEN;
2726         fsid = le64_to_cpup((void *)es->s_uuid) ^
2727                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2728         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2729         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2730         return 0;
2731 }
2732
2733 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2734  * is locked for write. Otherwise the are possible deadlocks:
2735  * Process 1                         Process 2
2736  * ext3_create()                     quota_sync()
2737  *   journal_start()                   write_dquot()
2738  *   vfs_dq_init()                       down(dqio_mutex)
2739  *     down(dqio_mutex)                    journal_start()
2740  *
2741  */
2742
2743 #ifdef CONFIG_QUOTA
2744
2745 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2746 {
2747         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2748 }
2749
2750 static int ext3_write_dquot(struct dquot *dquot)
2751 {
2752         int ret, err;
2753         handle_t *handle;
2754         struct inode *inode;
2755
2756         inode = dquot_to_inode(dquot);
2757         handle = ext3_journal_start(inode,
2758                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2759         if (IS_ERR(handle))
2760                 return PTR_ERR(handle);
2761         ret = dquot_commit(dquot);
2762         err = ext3_journal_stop(handle);
2763         if (!ret)
2764                 ret = err;
2765         return ret;
2766 }
2767
2768 static int ext3_acquire_dquot(struct dquot *dquot)
2769 {
2770         int ret, err;
2771         handle_t *handle;
2772
2773         handle = ext3_journal_start(dquot_to_inode(dquot),
2774                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2775         if (IS_ERR(handle))
2776                 return PTR_ERR(handle);
2777         ret = dquot_acquire(dquot);
2778         err = ext3_journal_stop(handle);
2779         if (!ret)
2780                 ret = err;
2781         return ret;
2782 }
2783
2784 static int ext3_release_dquot(struct dquot *dquot)
2785 {
2786         int ret, err;
2787         handle_t *handle;
2788
2789         handle = ext3_journal_start(dquot_to_inode(dquot),
2790                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2791         if (IS_ERR(handle)) {
2792                 /* Release dquot anyway to avoid endless cycle in dqput() */
2793                 dquot_release(dquot);
2794                 return PTR_ERR(handle);
2795         }
2796         ret = dquot_release(dquot);
2797         err = ext3_journal_stop(handle);
2798         if (!ret)
2799                 ret = err;
2800         return ret;
2801 }
2802
2803 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2804 {
2805         /* Are we journaling quotas? */
2806         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2807             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2808                 dquot_mark_dquot_dirty(dquot);
2809                 return ext3_write_dquot(dquot);
2810         } else {
2811                 return dquot_mark_dquot_dirty(dquot);
2812         }
2813 }
2814
2815 static int ext3_write_info(struct super_block *sb, int type)
2816 {
2817         int ret, err;
2818         handle_t *handle;
2819
2820         /* Data block + inode block */
2821         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2822         if (IS_ERR(handle))
2823                 return PTR_ERR(handle);
2824         ret = dquot_commit_info(sb, type);
2825         err = ext3_journal_stop(handle);
2826         if (!ret)
2827                 ret = err;
2828         return ret;
2829 }
2830
2831 /*
2832  * Turn on quotas during mount time - we need to find
2833  * the quota file and such...
2834  */
2835 static int ext3_quota_on_mount(struct super_block *sb, int type)
2836 {
2837         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2838                         EXT3_SB(sb)->s_jquota_fmt, type);
2839 }
2840
2841 /*
2842  * Standard function to be called on quota_on
2843  */
2844 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2845                          char *name, int remount)
2846 {
2847         int err;
2848         struct path path;
2849
2850         if (!test_opt(sb, QUOTA))
2851                 return -EINVAL;
2852         /* When remounting, no checks are needed and in fact, name is NULL */
2853         if (remount)
2854                 return vfs_quota_on(sb, type, format_id, name, remount);
2855
2856         err = kern_path(name, LOOKUP_FOLLOW, &path);
2857         if (err)
2858                 return err;
2859
2860         /* Quotafile not on the same filesystem? */
2861         if (path.mnt->mnt_sb != sb) {
2862                 path_put(&path);
2863                 return -EXDEV;
2864         }
2865         /* Journaling quota? */
2866         if (EXT3_SB(sb)->s_qf_names[type]) {
2867                 /* Quotafile not of fs root? */
2868                 if (path.dentry->d_parent != sb->s_root)
2869                         ext3_msg(sb, KERN_WARNING,
2870                                 "warning: Quota file not on filesystem root. "
2871                                 "Journaled quota will not work.");
2872         }
2873
2874         /*
2875          * When we journal data on quota file, we have to flush journal to see
2876          * all updates to the file when we bypass pagecache...
2877          */
2878         if (ext3_should_journal_data(path.dentry->d_inode)) {
2879                 /*
2880                  * We don't need to lock updates but journal_flush() could
2881                  * otherwise be livelocked...
2882                  */
2883                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2884                 err = journal_flush(EXT3_SB(sb)->s_journal);
2885                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2886                 if (err) {
2887                         path_put(&path);
2888                         return err;
2889                 }
2890         }
2891
2892         err = vfs_quota_on_path(sb, type, format_id, &path);
2893         path_put(&path);
2894         return err;
2895 }
2896
2897 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2898  * acquiring the locks... As quota files are never truncated and quota code
2899  * itself serializes the operations (and noone else should touch the files)
2900  * we don't have to be afraid of races */
2901 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2902                                size_t len, loff_t off)
2903 {
2904         struct inode *inode = sb_dqopt(sb)->files[type];
2905         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2906         int err = 0;
2907         int offset = off & (sb->s_blocksize - 1);
2908         int tocopy;
2909         size_t toread;
2910         struct buffer_head *bh;
2911         loff_t i_size = i_size_read(inode);
2912
2913         if (off > i_size)
2914                 return 0;
2915         if (off+len > i_size)
2916                 len = i_size-off;
2917         toread = len;
2918         while (toread > 0) {
2919                 tocopy = sb->s_blocksize - offset < toread ?
2920                                 sb->s_blocksize - offset : toread;
2921                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2922                 if (err)
2923                         return err;
2924                 if (!bh)        /* A hole? */
2925                         memset(data, 0, tocopy);
2926                 else
2927                         memcpy(data, bh->b_data+offset, tocopy);
2928                 brelse(bh);
2929                 offset = 0;
2930                 toread -= tocopy;
2931                 data += tocopy;
2932                 blk++;
2933         }
2934         return len;
2935 }
2936
2937 /* Write to quotafile (we know the transaction is already started and has
2938  * enough credits) */
2939 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2940                                 const char *data, size_t len, loff_t off)
2941 {
2942         struct inode *inode = sb_dqopt(sb)->files[type];
2943         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2944         int err = 0;
2945         int offset = off & (sb->s_blocksize - 1);
2946         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2947         struct buffer_head *bh;
2948         handle_t *handle = journal_current_handle();
2949
2950         if (!handle) {
2951                 ext3_msg(sb, KERN_WARNING,
2952                         "warning: quota write (off=%llu, len=%llu)"
2953                         " cancelled because transaction is not started.",
2954                         (unsigned long long)off, (unsigned long long)len);
2955                 return -EIO;
2956         }
2957
2958         /*
2959          * Since we account only one data block in transaction credits,
2960          * then it is impossible to cross a block boundary.
2961          */
2962         if (sb->s_blocksize - offset < len) {
2963                 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
2964                         " cancelled because not block aligned",
2965                         (unsigned long long)off, (unsigned long long)len);
2966                 return -EIO;
2967         }
2968         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2969         bh = ext3_bread(handle, inode, blk, 1, &err);
2970         if (!bh)
2971                 goto out;
2972         if (journal_quota) {
2973                 err = ext3_journal_get_write_access(handle, bh);
2974                 if (err) {
2975                         brelse(bh);
2976                         goto out;
2977                 }
2978         }
2979         lock_buffer(bh);
2980         memcpy(bh->b_data+offset, data, len);
2981         flush_dcache_page(bh->b_page);
2982         unlock_buffer(bh);
2983         if (journal_quota)
2984                 err = ext3_journal_dirty_metadata(handle, bh);
2985         else {
2986                 /* Always do at least ordered writes for quotas */
2987                 err = ext3_journal_dirty_data(handle, bh);
2988                 mark_buffer_dirty(bh);
2989         }
2990         brelse(bh);
2991 out:
2992         if (err) {
2993                 mutex_unlock(&inode->i_mutex);
2994                 return err;
2995         }
2996         if (inode->i_size < off + len) {
2997                 i_size_write(inode, off + len);
2998                 EXT3_I(inode)->i_disksize = inode->i_size;
2999         }
3000         inode->i_version++;
3001         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3002         ext3_mark_inode_dirty(handle, inode);
3003         mutex_unlock(&inode->i_mutex);
3004         return len;
3005 }
3006
3007 #endif
3008
3009 static int ext3_get_sb(struct file_system_type *fs_type,
3010         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3011 {
3012         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
3013 }
3014
3015 static struct file_system_type ext3_fs_type = {
3016         .owner          = THIS_MODULE,
3017         .name           = "ext3",
3018         .get_sb         = ext3_get_sb,
3019         .kill_sb        = kill_block_super,
3020         .fs_flags       = FS_REQUIRES_DEV,
3021 };
3022
3023 static int __init init_ext3_fs(void)
3024 {
3025         int err = init_ext3_xattr();
3026         if (err)
3027                 return err;
3028         err = init_inodecache();
3029         if (err)
3030                 goto out1;
3031         err = register_filesystem(&ext3_fs_type);
3032         if (err)
3033                 goto out;
3034         return 0;
3035 out:
3036         destroy_inodecache();
3037 out1:
3038         exit_ext3_xattr();
3039         return err;
3040 }
3041
3042 static void __exit exit_ext3_fs(void)
3043 {
3044         unregister_filesystem(&ext3_fs_type);
3045         destroy_inodecache();
3046         exit_ext3_xattr();
3047 }
3048
3049 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3050 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3051 MODULE_LICENSE("GPL");
3052 module_init(init_ext3_fs)
3053 module_exit(exit_ext3_fs)