dquot: move dquot drop responsibility into the filesystem
[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
532         vfs_dq_drop(inode);
533         ext3_discard_reservation(inode);
534         EXT3_I(inode)->i_block_alloc_info = NULL;
535         if (unlikely(rsv))
536                 kfree(rsv);
537 }
538
539 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
540 {
541 #if defined(CONFIG_QUOTA)
542         struct ext3_sb_info *sbi = EXT3_SB(sb);
543
544         if (sbi->s_jquota_fmt) {
545                 char *fmtname = "";
546
547                 switch (sbi->s_jquota_fmt) {
548                 case QFMT_VFS_OLD:
549                         fmtname = "vfsold";
550                         break;
551                 case QFMT_VFS_V0:
552                         fmtname = "vfsv0";
553                         break;
554                 case QFMT_VFS_V1:
555                         fmtname = "vfsv1";
556                         break;
557                 }
558                 seq_printf(seq, ",jqfmt=%s", fmtname);
559         }
560
561         if (sbi->s_qf_names[USRQUOTA])
562                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
563
564         if (sbi->s_qf_names[GRPQUOTA])
565                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
566
567         if (test_opt(sb, USRQUOTA))
568                 seq_puts(seq, ",usrquota");
569
570         if (test_opt(sb, GRPQUOTA))
571                 seq_puts(seq, ",grpquota");
572 #endif
573 }
574
575 static char *data_mode_string(unsigned long mode)
576 {
577         switch (mode) {
578         case EXT3_MOUNT_JOURNAL_DATA:
579                 return "journal";
580         case EXT3_MOUNT_ORDERED_DATA:
581                 return "ordered";
582         case EXT3_MOUNT_WRITEBACK_DATA:
583                 return "writeback";
584         }
585         return "unknown";
586 }
587
588 /*
589  * Show an option if
590  *  - it's set to a non-default value OR
591  *  - if the per-sb default is different from the global default
592  */
593 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
594 {
595         struct super_block *sb = vfs->mnt_sb;
596         struct ext3_sb_info *sbi = EXT3_SB(sb);
597         struct ext3_super_block *es = sbi->s_es;
598         unsigned long def_mount_opts;
599
600         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
601
602         if (sbi->s_sb_block != 1)
603                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
604         if (test_opt(sb, MINIX_DF))
605                 seq_puts(seq, ",minixdf");
606         if (test_opt(sb, GRPID))
607                 seq_puts(seq, ",grpid");
608         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
609                 seq_puts(seq, ",nogrpid");
610         if (sbi->s_resuid != EXT3_DEF_RESUID ||
611             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
612                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
613         }
614         if (sbi->s_resgid != EXT3_DEF_RESGID ||
615             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
616                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
617         }
618         if (test_opt(sb, ERRORS_RO)) {
619                 int def_errors = le16_to_cpu(es->s_errors);
620
621                 if (def_errors == EXT3_ERRORS_PANIC ||
622                     def_errors == EXT3_ERRORS_CONTINUE) {
623                         seq_puts(seq, ",errors=remount-ro");
624                 }
625         }
626         if (test_opt(sb, ERRORS_CONT))
627                 seq_puts(seq, ",errors=continue");
628         if (test_opt(sb, ERRORS_PANIC))
629                 seq_puts(seq, ",errors=panic");
630         if (test_opt(sb, NO_UID32))
631                 seq_puts(seq, ",nouid32");
632         if (test_opt(sb, DEBUG))
633                 seq_puts(seq, ",debug");
634         if (test_opt(sb, OLDALLOC))
635                 seq_puts(seq, ",oldalloc");
636 #ifdef CONFIG_EXT3_FS_XATTR
637         if (test_opt(sb, XATTR_USER))
638                 seq_puts(seq, ",user_xattr");
639         if (!test_opt(sb, XATTR_USER) &&
640             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
641                 seq_puts(seq, ",nouser_xattr");
642         }
643 #endif
644 #ifdef CONFIG_EXT3_FS_POSIX_ACL
645         if (test_opt(sb, POSIX_ACL))
646                 seq_puts(seq, ",acl");
647         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
648                 seq_puts(seq, ",noacl");
649 #endif
650         if (!test_opt(sb, RESERVATION))
651                 seq_puts(seq, ",noreservation");
652         if (sbi->s_commit_interval) {
653                 seq_printf(seq, ",commit=%u",
654                            (unsigned) (sbi->s_commit_interval / HZ));
655         }
656         if (test_opt(sb, BARRIER))
657                 seq_puts(seq, ",barrier=1");
658         if (test_opt(sb, NOBH))
659                 seq_puts(seq, ",nobh");
660
661         seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
662         if (test_opt(sb, DATA_ERR_ABORT))
663                 seq_puts(seq, ",data_err=abort");
664
665         if (test_opt(sb, NOLOAD))
666                 seq_puts(seq, ",norecovery");
667
668         ext3_show_quota_options(seq, sb);
669
670         return 0;
671 }
672
673
674 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
675                 u64 ino, u32 generation)
676 {
677         struct inode *inode;
678
679         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
680                 return ERR_PTR(-ESTALE);
681         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
682                 return ERR_PTR(-ESTALE);
683
684         /* iget isn't really right if the inode is currently unallocated!!
685          *
686          * ext3_read_inode will return a bad_inode if the inode had been
687          * deleted, so we should be safe.
688          *
689          * Currently we don't know the generation for parent directory, so
690          * a generation of 0 means "accept any"
691          */
692         inode = ext3_iget(sb, ino);
693         if (IS_ERR(inode))
694                 return ERR_CAST(inode);
695         if (generation && inode->i_generation != generation) {
696                 iput(inode);
697                 return ERR_PTR(-ESTALE);
698         }
699
700         return inode;
701 }
702
703 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
704                 int fh_len, int fh_type)
705 {
706         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
707                                     ext3_nfs_get_inode);
708 }
709
710 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
711                 int fh_len, int fh_type)
712 {
713         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
714                                     ext3_nfs_get_inode);
715 }
716
717 /*
718  * Try to release metadata pages (indirect blocks, directories) which are
719  * mapped via the block device.  Since these pages could have journal heads
720  * which would prevent try_to_free_buffers() from freeing them, we must use
721  * jbd layer's try_to_free_buffers() function to release them.
722  */
723 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
724                                  gfp_t wait)
725 {
726         journal_t *journal = EXT3_SB(sb)->s_journal;
727
728         WARN_ON(PageChecked(page));
729         if (!page_has_buffers(page))
730                 return 0;
731         if (journal)
732                 return journal_try_to_free_buffers(journal, page, 
733                                                    wait & ~__GFP_WAIT);
734         return try_to_free_buffers(page);
735 }
736
737 #ifdef CONFIG_QUOTA
738 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
739 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
740
741 static int ext3_write_dquot(struct dquot *dquot);
742 static int ext3_acquire_dquot(struct dquot *dquot);
743 static int ext3_release_dquot(struct dquot *dquot);
744 static int ext3_mark_dquot_dirty(struct dquot *dquot);
745 static int ext3_write_info(struct super_block *sb, int type);
746 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
747                                 char *path, int remount);
748 static int ext3_quota_on_mount(struct super_block *sb, int type);
749 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
750                                size_t len, loff_t off);
751 static ssize_t ext3_quota_write(struct super_block *sb, int type,
752                                 const char *data, size_t len, loff_t off);
753
754 static const struct dquot_operations ext3_quota_operations = {
755         .initialize     = dquot_initialize,
756         .drop           = dquot_drop,
757         .write_dquot    = ext3_write_dquot,
758         .acquire_dquot  = ext3_acquire_dquot,
759         .release_dquot  = ext3_release_dquot,
760         .mark_dirty     = ext3_mark_dquot_dirty,
761         .write_info     = ext3_write_info,
762         .alloc_dquot    = dquot_alloc,
763         .destroy_dquot  = dquot_destroy,
764 };
765
766 static const struct quotactl_ops ext3_qctl_operations = {
767         .quota_on       = ext3_quota_on,
768         .quota_off      = vfs_quota_off,
769         .quota_sync     = vfs_quota_sync,
770         .get_info       = vfs_get_dqinfo,
771         .set_info       = vfs_set_dqinfo,
772         .get_dqblk      = vfs_get_dqblk,
773         .set_dqblk      = vfs_set_dqblk
774 };
775 #endif
776
777 static const struct super_operations ext3_sops = {
778         .alloc_inode    = ext3_alloc_inode,
779         .destroy_inode  = ext3_destroy_inode,
780         .write_inode    = ext3_write_inode,
781         .dirty_inode    = ext3_dirty_inode,
782         .delete_inode   = ext3_delete_inode,
783         .put_super      = ext3_put_super,
784         .sync_fs        = ext3_sync_fs,
785         .freeze_fs      = ext3_freeze,
786         .unfreeze_fs    = ext3_unfreeze,
787         .statfs         = ext3_statfs,
788         .remount_fs     = ext3_remount,
789         .clear_inode    = ext3_clear_inode,
790         .show_options   = ext3_show_options,
791 #ifdef CONFIG_QUOTA
792         .quota_read     = ext3_quota_read,
793         .quota_write    = ext3_quota_write,
794 #endif
795         .bdev_try_to_free_page = bdev_try_to_free_page,
796 };
797
798 static const struct export_operations ext3_export_ops = {
799         .fh_to_dentry = ext3_fh_to_dentry,
800         .fh_to_parent = ext3_fh_to_parent,
801         .get_parent = ext3_get_parent,
802 };
803
804 enum {
805         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
806         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
807         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
808         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
809         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
810         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
811         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
812         Opt_data_err_abort, Opt_data_err_ignore,
813         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
814         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
815         Opt_noquota, Opt_ignore, Opt_barrier, Opt_err, Opt_resize,
816         Opt_usrquota, Opt_grpquota
817 };
818
819 static const match_table_t tokens = {
820         {Opt_bsd_df, "bsddf"},
821         {Opt_minix_df, "minixdf"},
822         {Opt_grpid, "grpid"},
823         {Opt_grpid, "bsdgroups"},
824         {Opt_nogrpid, "nogrpid"},
825         {Opt_nogrpid, "sysvgroups"},
826         {Opt_resgid, "resgid=%u"},
827         {Opt_resuid, "resuid=%u"},
828         {Opt_sb, "sb=%u"},
829         {Opt_err_cont, "errors=continue"},
830         {Opt_err_panic, "errors=panic"},
831         {Opt_err_ro, "errors=remount-ro"},
832         {Opt_nouid32, "nouid32"},
833         {Opt_nocheck, "nocheck"},
834         {Opt_nocheck, "check=none"},
835         {Opt_debug, "debug"},
836         {Opt_oldalloc, "oldalloc"},
837         {Opt_orlov, "orlov"},
838         {Opt_user_xattr, "user_xattr"},
839         {Opt_nouser_xattr, "nouser_xattr"},
840         {Opt_acl, "acl"},
841         {Opt_noacl, "noacl"},
842         {Opt_reservation, "reservation"},
843         {Opt_noreservation, "noreservation"},
844         {Opt_noload, "noload"},
845         {Opt_noload, "norecovery"},
846         {Opt_nobh, "nobh"},
847         {Opt_bh, "bh"},
848         {Opt_commit, "commit=%u"},
849         {Opt_journal_update, "journal=update"},
850         {Opt_journal_inum, "journal=%u"},
851         {Opt_journal_dev, "journal_dev=%u"},
852         {Opt_abort, "abort"},
853         {Opt_data_journal, "data=journal"},
854         {Opt_data_ordered, "data=ordered"},
855         {Opt_data_writeback, "data=writeback"},
856         {Opt_data_err_abort, "data_err=abort"},
857         {Opt_data_err_ignore, "data_err=ignore"},
858         {Opt_offusrjquota, "usrjquota="},
859         {Opt_usrjquota, "usrjquota=%s"},
860         {Opt_offgrpjquota, "grpjquota="},
861         {Opt_grpjquota, "grpjquota=%s"},
862         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
863         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
864         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
865         {Opt_grpquota, "grpquota"},
866         {Opt_noquota, "noquota"},
867         {Opt_quota, "quota"},
868         {Opt_usrquota, "usrquota"},
869         {Opt_barrier, "barrier=%u"},
870         {Opt_resize, "resize"},
871         {Opt_err, NULL},
872 };
873
874 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
875 {
876         ext3_fsblk_t    sb_block;
877         char            *options = (char *) *data;
878
879         if (!options || strncmp(options, "sb=", 3) != 0)
880                 return 1;       /* Default location */
881         options += 3;
882         /*todo: use simple_strtoll with >32bit ext3 */
883         sb_block = simple_strtoul(options, &options, 0);
884         if (*options && *options != ',') {
885                 ext3_msg(sb, "error: invalid sb specification: %s",
886                        (char *) *data);
887                 return 1;
888         }
889         if (*options == ',')
890                 options++;
891         *data = (void *) options;
892         return sb_block;
893 }
894
895 #ifdef CONFIG_QUOTA
896 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
897 {
898         struct ext3_sb_info *sbi = EXT3_SB(sb);
899         char *qname;
900
901         if (sb_any_quota_loaded(sb) &&
902                 !sbi->s_qf_names[qtype]) {
903                 ext3_msg(sb, KERN_ERR,
904                         "Cannot change journaled "
905                         "quota options when quota turned on");
906                 return 0;
907         }
908         qname = match_strdup(args);
909         if (!qname) {
910                 ext3_msg(sb, KERN_ERR,
911                         "Not enough memory for storing quotafile name");
912                 return 0;
913         }
914         if (sbi->s_qf_names[qtype] &&
915                 strcmp(sbi->s_qf_names[qtype], qname)) {
916                 ext3_msg(sb, KERN_ERR,
917                         "%s quota file already specified", QTYPE2NAME(qtype));
918                 kfree(qname);
919                 return 0;
920         }
921         sbi->s_qf_names[qtype] = qname;
922         if (strchr(sbi->s_qf_names[qtype], '/')) {
923                 ext3_msg(sb, KERN_ERR,
924                         "quotafile must be on filesystem root");
925                 kfree(sbi->s_qf_names[qtype]);
926                 sbi->s_qf_names[qtype] = NULL;
927                 return 0;
928         }
929         set_opt(sbi->s_mount_opt, QUOTA);
930         return 1;
931 }
932
933 static int clear_qf_name(struct super_block *sb, int qtype) {
934
935         struct ext3_sb_info *sbi = EXT3_SB(sb);
936
937         if (sb_any_quota_loaded(sb) &&
938                 sbi->s_qf_names[qtype]) {
939                 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
940                         " when quota turned on");
941                 return 0;
942         }
943         /*
944          * The space will be released later when all options are confirmed
945          * to be correct
946          */
947         sbi->s_qf_names[qtype] = NULL;
948         return 1;
949 }
950 #endif
951
952 static int parse_options (char *options, struct super_block *sb,
953                           unsigned int *inum, unsigned long *journal_devnum,
954                           ext3_fsblk_t *n_blocks_count, int is_remount)
955 {
956         struct ext3_sb_info *sbi = EXT3_SB(sb);
957         char * p;
958         substring_t args[MAX_OPT_ARGS];
959         int data_opt = 0;
960         int option;
961 #ifdef CONFIG_QUOTA
962         int qfmt;
963 #endif
964
965         if (!options)
966                 return 1;
967
968         while ((p = strsep (&options, ",")) != NULL) {
969                 int token;
970                 if (!*p)
971                         continue;
972
973                 token = match_token(p, tokens, args);
974                 switch (token) {
975                 case Opt_bsd_df:
976                         clear_opt (sbi->s_mount_opt, MINIX_DF);
977                         break;
978                 case Opt_minix_df:
979                         set_opt (sbi->s_mount_opt, MINIX_DF);
980                         break;
981                 case Opt_grpid:
982                         set_opt (sbi->s_mount_opt, GRPID);
983                         break;
984                 case Opt_nogrpid:
985                         clear_opt (sbi->s_mount_opt, GRPID);
986                         break;
987                 case Opt_resuid:
988                         if (match_int(&args[0], &option))
989                                 return 0;
990                         sbi->s_resuid = option;
991                         break;
992                 case Opt_resgid:
993                         if (match_int(&args[0], &option))
994                                 return 0;
995                         sbi->s_resgid = option;
996                         break;
997                 case Opt_sb:
998                         /* handled by get_sb_block() instead of here */
999                         /* *sb_block = match_int(&args[0]); */
1000                         break;
1001                 case Opt_err_panic:
1002                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1003                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1004                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1005                         break;
1006                 case Opt_err_ro:
1007                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1008                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1009                         set_opt (sbi->s_mount_opt, ERRORS_RO);
1010                         break;
1011                 case Opt_err_cont:
1012                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1013                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1014                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
1015                         break;
1016                 case Opt_nouid32:
1017                         set_opt (sbi->s_mount_opt, NO_UID32);
1018                         break;
1019                 case Opt_nocheck:
1020                         clear_opt (sbi->s_mount_opt, CHECK);
1021                         break;
1022                 case Opt_debug:
1023                         set_opt (sbi->s_mount_opt, DEBUG);
1024                         break;
1025                 case Opt_oldalloc:
1026                         set_opt (sbi->s_mount_opt, OLDALLOC);
1027                         break;
1028                 case Opt_orlov:
1029                         clear_opt (sbi->s_mount_opt, OLDALLOC);
1030                         break;
1031 #ifdef CONFIG_EXT3_FS_XATTR
1032                 case Opt_user_xattr:
1033                         set_opt (sbi->s_mount_opt, XATTR_USER);
1034                         break;
1035                 case Opt_nouser_xattr:
1036                         clear_opt (sbi->s_mount_opt, XATTR_USER);
1037                         break;
1038 #else
1039                 case Opt_user_xattr:
1040                 case Opt_nouser_xattr:
1041                         ext3_msg(sb, KERN_INFO,
1042                                 "(no)user_xattr options not supported");
1043                         break;
1044 #endif
1045 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1046                 case Opt_acl:
1047                         set_opt(sbi->s_mount_opt, POSIX_ACL);
1048                         break;
1049                 case Opt_noacl:
1050                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
1051                         break;
1052 #else
1053                 case Opt_acl:
1054                 case Opt_noacl:
1055                         ext3_msg(sb, KERN_INFO,
1056                                 "(no)acl options not supported");
1057                         break;
1058 #endif
1059                 case Opt_reservation:
1060                         set_opt(sbi->s_mount_opt, RESERVATION);
1061                         break;
1062                 case Opt_noreservation:
1063                         clear_opt(sbi->s_mount_opt, RESERVATION);
1064                         break;
1065                 case Opt_journal_update:
1066                         /* @@@ FIXME */
1067                         /* Eventually we will want to be able to create
1068                            a journal file here.  For now, only allow the
1069                            user to specify an existing inode to be the
1070                            journal file. */
1071                         if (is_remount) {
1072                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1073                                         "journal on remount");
1074                                 return 0;
1075                         }
1076                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1077                         break;
1078                 case Opt_journal_inum:
1079                         if (is_remount) {
1080                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1081                                        "journal on remount");
1082                                 return 0;
1083                         }
1084                         if (match_int(&args[0], &option))
1085                                 return 0;
1086                         *inum = option;
1087                         break;
1088                 case Opt_journal_dev:
1089                         if (is_remount) {
1090                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1091                                        "journal on remount");
1092                                 return 0;
1093                         }
1094                         if (match_int(&args[0], &option))
1095                                 return 0;
1096                         *journal_devnum = option;
1097                         break;
1098                 case Opt_noload:
1099                         set_opt (sbi->s_mount_opt, NOLOAD);
1100                         break;
1101                 case Opt_commit:
1102                         if (match_int(&args[0], &option))
1103                                 return 0;
1104                         if (option < 0)
1105                                 return 0;
1106                         if (option == 0)
1107                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1108                         sbi->s_commit_interval = HZ * option;
1109                         break;
1110                 case Opt_data_journal:
1111                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1112                         goto datacheck;
1113                 case Opt_data_ordered:
1114                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1115                         goto datacheck;
1116                 case Opt_data_writeback:
1117                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1118                 datacheck:
1119                         if (is_remount) {
1120                                 if (test_opt(sb, DATA_FLAGS) == data_opt)
1121                                         break;
1122                                 ext3_msg(sb, KERN_ERR,
1123                                         "error: cannot change "
1124                                         "data mode on remount. The filesystem "
1125                                         "is mounted in data=%s mode and you "
1126                                         "try to remount it in data=%s mode.",
1127                                         data_mode_string(test_opt(sb,
1128                                                         DATA_FLAGS)),
1129                                         data_mode_string(data_opt));
1130                                 return 0;
1131                         } else {
1132                                 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1133                                 sbi->s_mount_opt |= data_opt;
1134                         }
1135                         break;
1136                 case Opt_data_err_abort:
1137                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1138                         break;
1139                 case Opt_data_err_ignore:
1140                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1141                         break;
1142 #ifdef CONFIG_QUOTA
1143                 case Opt_usrjquota:
1144                         if (!set_qf_name(sb, USRQUOTA, &args[0]))
1145                                 return 0;
1146                         break;
1147                 case Opt_grpjquota:
1148                         if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1149                                 return 0;
1150                         break;
1151                 case Opt_offusrjquota:
1152                         if (!clear_qf_name(sb, USRQUOTA))
1153                                 return 0;
1154                         break;
1155                 case Opt_offgrpjquota:
1156                         if (!clear_qf_name(sb, GRPQUOTA))
1157                                 return 0;
1158                         break;
1159                 case Opt_jqfmt_vfsold:
1160                         qfmt = QFMT_VFS_OLD;
1161                         goto set_qf_format;
1162                 case Opt_jqfmt_vfsv0:
1163                         qfmt = QFMT_VFS_V0;
1164                         goto set_qf_format;
1165                 case Opt_jqfmt_vfsv1:
1166                         qfmt = QFMT_VFS_V1;
1167 set_qf_format:
1168                         if (sb_any_quota_loaded(sb) &&
1169                             sbi->s_jquota_fmt != qfmt) {
1170                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1171                                         "journaled quota options when "
1172                                         "quota turned on.");
1173                                 return 0;
1174                         }
1175                         sbi->s_jquota_fmt = qfmt;
1176                         break;
1177                 case Opt_quota:
1178                 case Opt_usrquota:
1179                         set_opt(sbi->s_mount_opt, QUOTA);
1180                         set_opt(sbi->s_mount_opt, USRQUOTA);
1181                         break;
1182                 case Opt_grpquota:
1183                         set_opt(sbi->s_mount_opt, QUOTA);
1184                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1185                         break;
1186                 case Opt_noquota:
1187                         if (sb_any_quota_loaded(sb)) {
1188                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1189                                         "quota options when quota turned on.");
1190                                 return 0;
1191                         }
1192                         clear_opt(sbi->s_mount_opt, QUOTA);
1193                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1194                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1195                         break;
1196 #else
1197                 case Opt_quota:
1198                 case Opt_usrquota:
1199                 case Opt_grpquota:
1200                         ext3_msg(sb, KERN_ERR,
1201                                 "error: quota options not supported.");
1202                         break;
1203                 case Opt_usrjquota:
1204                 case Opt_grpjquota:
1205                 case Opt_offusrjquota:
1206                 case Opt_offgrpjquota:
1207                 case Opt_jqfmt_vfsold:
1208                 case Opt_jqfmt_vfsv0:
1209                 case Opt_jqfmt_vfsv1:
1210                         ext3_msg(sb, KERN_ERR,
1211                                 "error: journaled quota options not "
1212                                 "supported.");
1213                         break;
1214                 case Opt_noquota:
1215                         break;
1216 #endif
1217                 case Opt_abort:
1218                         set_opt(sbi->s_mount_opt, ABORT);
1219                         break;
1220                 case Opt_barrier:
1221                         if (match_int(&args[0], &option))
1222                                 return 0;
1223                         if (option)
1224                                 set_opt(sbi->s_mount_opt, BARRIER);
1225                         else
1226                                 clear_opt(sbi->s_mount_opt, BARRIER);
1227                         break;
1228                 case Opt_ignore:
1229                         break;
1230                 case Opt_resize:
1231                         if (!is_remount) {
1232                                 ext3_msg(sb, KERN_ERR,
1233                                         "error: resize option only available "
1234                                         "for remount");
1235                                 return 0;
1236                         }
1237                         if (match_int(&args[0], &option) != 0)
1238                                 return 0;
1239                         *n_blocks_count = option;
1240                         break;
1241                 case Opt_nobh:
1242                         set_opt(sbi->s_mount_opt, NOBH);
1243                         break;
1244                 case Opt_bh:
1245                         clear_opt(sbi->s_mount_opt, NOBH);
1246                         break;
1247                 default:
1248                         ext3_msg(sb, KERN_ERR,
1249                                 "error: unrecognized mount option \"%s\" "
1250                                 "or missing value", p);
1251                         return 0;
1252                 }
1253         }
1254 #ifdef CONFIG_QUOTA
1255         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1256                 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1257                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1258                 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1259                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1260
1261                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1262                         ext3_msg(sb, KERN_ERR, "error: old and new quota "
1263                                         "format mixing.");
1264                         return 0;
1265                 }
1266
1267                 if (!sbi->s_jquota_fmt) {
1268                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1269                                         "not specified.");
1270                         return 0;
1271                 }
1272         } else {
1273                 if (sbi->s_jquota_fmt) {
1274                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1275                                         "specified with no journaling "
1276                                         "enabled.");
1277                         return 0;
1278                 }
1279         }
1280 #endif
1281         return 1;
1282 }
1283
1284 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1285                             int read_only)
1286 {
1287         struct ext3_sb_info *sbi = EXT3_SB(sb);
1288         int res = 0;
1289
1290         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1291                 ext3_msg(sb, KERN_ERR,
1292                         "error: revision level too high, "
1293                         "forcing read-only mode");
1294                 res = MS_RDONLY;
1295         }
1296         if (read_only)
1297                 return res;
1298         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1299                 ext3_msg(sb, KERN_WARNING,
1300                         "warning: mounting unchecked fs, "
1301                         "running e2fsck is recommended");
1302         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1303                 ext3_msg(sb, KERN_WARNING,
1304                         "warning: mounting fs with errors, "
1305                         "running e2fsck is recommended");
1306         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1307                  le16_to_cpu(es->s_mnt_count) >=
1308                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1309                 ext3_msg(sb, KERN_WARNING,
1310                         "warning: maximal mount count reached, "
1311                         "running e2fsck is recommended");
1312         else if (le32_to_cpu(es->s_checkinterval) &&
1313                 (le32_to_cpu(es->s_lastcheck) +
1314                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1315                 ext3_msg(sb, KERN_WARNING,
1316                         "warning: checktime reached, "
1317                         "running e2fsck is recommended");
1318 #if 0
1319                 /* @@@ We _will_ want to clear the valid bit if we find
1320                    inconsistencies, to force a fsck at reboot.  But for
1321                    a plain journaled filesystem we can keep it set as
1322                    valid forever! :) */
1323         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1324 #endif
1325         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1326                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1327         le16_add_cpu(&es->s_mnt_count, 1);
1328         es->s_mtime = cpu_to_le32(get_seconds());
1329         ext3_update_dynamic_rev(sb);
1330         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1331
1332         ext3_commit_super(sb, es, 1);
1333         if (test_opt(sb, DEBUG))
1334                 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1335                                 "bpg=%lu, ipg=%lu, mo=%04lx]",
1336                         sb->s_blocksize,
1337                         sbi->s_groups_count,
1338                         EXT3_BLOCKS_PER_GROUP(sb),
1339                         EXT3_INODES_PER_GROUP(sb),
1340                         sbi->s_mount_opt);
1341
1342         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1343                 char b[BDEVNAME_SIZE];
1344                 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1345                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1346         } else {
1347                 ext3_msg(sb, KERN_INFO, "using internal journal");
1348         }
1349         return res;
1350 }
1351
1352 /* Called at mount-time, super-block is locked */
1353 static int ext3_check_descriptors(struct super_block *sb)
1354 {
1355         struct ext3_sb_info *sbi = EXT3_SB(sb);
1356         int i;
1357
1358         ext3_debug ("Checking group descriptors");
1359
1360         for (i = 0; i < sbi->s_groups_count; i++) {
1361                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1362                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1363                 ext3_fsblk_t last_block;
1364
1365                 if (i == sbi->s_groups_count - 1)
1366                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1367                 else
1368                         last_block = first_block +
1369                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1370
1371                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1372                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1373                 {
1374                         ext3_error (sb, "ext3_check_descriptors",
1375                                     "Block bitmap for group %d"
1376                                     " not in group (block %lu)!",
1377                                     i, (unsigned long)
1378                                         le32_to_cpu(gdp->bg_block_bitmap));
1379                         return 0;
1380                 }
1381                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1382                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1383                 {
1384                         ext3_error (sb, "ext3_check_descriptors",
1385                                     "Inode bitmap for group %d"
1386                                     " not in group (block %lu)!",
1387                                     i, (unsigned long)
1388                                         le32_to_cpu(gdp->bg_inode_bitmap));
1389                         return 0;
1390                 }
1391                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1392                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1393                     last_block)
1394                 {
1395                         ext3_error (sb, "ext3_check_descriptors",
1396                                     "Inode table for group %d"
1397                                     " not in group (block %lu)!",
1398                                     i, (unsigned long)
1399                                         le32_to_cpu(gdp->bg_inode_table));
1400                         return 0;
1401                 }
1402         }
1403
1404         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1405         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1406         return 1;
1407 }
1408
1409
1410 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1411  * the superblock) which were deleted from all directories, but held open by
1412  * a process at the time of a crash.  We walk the list and try to delete these
1413  * inodes at recovery time (only with a read-write filesystem).
1414  *
1415  * In order to keep the orphan inode chain consistent during traversal (in
1416  * case of crash during recovery), we link each inode into the superblock
1417  * orphan list_head and handle it the same way as an inode deletion during
1418  * normal operation (which journals the operations for us).
1419  *
1420  * We only do an iget() and an iput() on each inode, which is very safe if we
1421  * accidentally point at an in-use or already deleted inode.  The worst that
1422  * can happen in this case is that we get a "bit already cleared" message from
1423  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1424  * e2fsck was run on this filesystem, and it must have already done the orphan
1425  * inode cleanup for us, so we can safely abort without any further action.
1426  */
1427 static void ext3_orphan_cleanup (struct super_block * sb,
1428                                  struct ext3_super_block * es)
1429 {
1430         unsigned int s_flags = sb->s_flags;
1431         int nr_orphans = 0, nr_truncates = 0;
1432 #ifdef CONFIG_QUOTA
1433         int i;
1434 #endif
1435         if (!es->s_last_orphan) {
1436                 jbd_debug(4, "no orphan inodes to clean up\n");
1437                 return;
1438         }
1439
1440         if (bdev_read_only(sb->s_bdev)) {
1441                 ext3_msg(sb, KERN_ERR, "error: write access "
1442                         "unavailable, skipping orphan cleanup.");
1443                 return;
1444         }
1445
1446         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1447                 if (es->s_last_orphan)
1448                         jbd_debug(1, "Errors on filesystem, "
1449                                   "clearing orphan list.\n");
1450                 es->s_last_orphan = 0;
1451                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1452                 return;
1453         }
1454
1455         if (s_flags & MS_RDONLY) {
1456                 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1457                 sb->s_flags &= ~MS_RDONLY;
1458         }
1459 #ifdef CONFIG_QUOTA
1460         /* Needed for iput() to work correctly and not trash data */
1461         sb->s_flags |= MS_ACTIVE;
1462         /* Turn on quotas so that they are updated correctly */
1463         for (i = 0; i < MAXQUOTAS; i++) {
1464                 if (EXT3_SB(sb)->s_qf_names[i]) {
1465                         int ret = ext3_quota_on_mount(sb, i);
1466                         if (ret < 0)
1467                                 ext3_msg(sb, KERN_ERR,
1468                                         "error: cannot turn on journaled "
1469                                         "quota: %d", ret);
1470                 }
1471         }
1472 #endif
1473
1474         while (es->s_last_orphan) {
1475                 struct inode *inode;
1476
1477                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1478                 if (IS_ERR(inode)) {
1479                         es->s_last_orphan = 0;
1480                         break;
1481                 }
1482
1483                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1484                 vfs_dq_init(inode);
1485                 if (inode->i_nlink) {
1486                         printk(KERN_DEBUG
1487                                 "%s: truncating inode %lu to %Ld bytes\n",
1488                                 __func__, inode->i_ino, inode->i_size);
1489                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1490                                   inode->i_ino, inode->i_size);
1491                         ext3_truncate(inode);
1492                         nr_truncates++;
1493                 } else {
1494                         printk(KERN_DEBUG
1495                                 "%s: deleting unreferenced inode %lu\n",
1496                                 __func__, inode->i_ino);
1497                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1498                                   inode->i_ino);
1499                         nr_orphans++;
1500                 }
1501                 iput(inode);  /* The delete magic happens here! */
1502         }
1503
1504 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1505
1506         if (nr_orphans)
1507                 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1508                        PLURAL(nr_orphans));
1509         if (nr_truncates)
1510                 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1511                        PLURAL(nr_truncates));
1512 #ifdef CONFIG_QUOTA
1513         /* Turn quotas off */
1514         for (i = 0; i < MAXQUOTAS; i++) {
1515                 if (sb_dqopt(sb)->files[i])
1516                         vfs_quota_off(sb, i, 0);
1517         }
1518 #endif
1519         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1520 }
1521
1522 /*
1523  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1524  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1525  * We need to be 1 filesystem block less than the 2^32 sector limit.
1526  */
1527 static loff_t ext3_max_size(int bits)
1528 {
1529         loff_t res = EXT3_NDIR_BLOCKS;
1530         int meta_blocks;
1531         loff_t upper_limit;
1532
1533         /* This is calculated to be the largest file size for a
1534          * dense, file such that the total number of
1535          * sectors in the file, including data and all indirect blocks,
1536          * does not exceed 2^32 -1
1537          * __u32 i_blocks representing the total number of
1538          * 512 bytes blocks of the file
1539          */
1540         upper_limit = (1LL << 32) - 1;
1541
1542         /* total blocks in file system block size */
1543         upper_limit >>= (bits - 9);
1544
1545
1546         /* indirect blocks */
1547         meta_blocks = 1;
1548         /* double indirect blocks */
1549         meta_blocks += 1 + (1LL << (bits-2));
1550         /* tripple indirect blocks */
1551         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1552
1553         upper_limit -= meta_blocks;
1554         upper_limit <<= bits;
1555
1556         res += 1LL << (bits-2);
1557         res += 1LL << (2*(bits-2));
1558         res += 1LL << (3*(bits-2));
1559         res <<= bits;
1560         if (res > upper_limit)
1561                 res = upper_limit;
1562
1563         if (res > MAX_LFS_FILESIZE)
1564                 res = MAX_LFS_FILESIZE;
1565
1566         return res;
1567 }
1568
1569 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1570                                     ext3_fsblk_t logic_sb_block,
1571                                     int nr)
1572 {
1573         struct ext3_sb_info *sbi = EXT3_SB(sb);
1574         unsigned long bg, first_meta_bg;
1575         int has_super = 0;
1576
1577         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1578
1579         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1580             nr < first_meta_bg)
1581                 return (logic_sb_block + nr + 1);
1582         bg = sbi->s_desc_per_block * nr;
1583         if (ext3_bg_has_super(sb, bg))
1584                 has_super = 1;
1585         return (has_super + ext3_group_first_block_no(sb, bg));
1586 }
1587
1588
1589 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1590 {
1591         struct buffer_head * bh;
1592         struct ext3_super_block *es = NULL;
1593         struct ext3_sb_info *sbi;
1594         ext3_fsblk_t block;
1595         ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1596         ext3_fsblk_t logic_sb_block;
1597         unsigned long offset = 0;
1598         unsigned int journal_inum = 0;
1599         unsigned long journal_devnum = 0;
1600         unsigned long def_mount_opts;
1601         struct inode *root;
1602         int blocksize;
1603         int hblock;
1604         int db_count;
1605         int i;
1606         int needs_recovery;
1607         int ret = -EINVAL;
1608         __le32 features;
1609         int err;
1610
1611         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1612         if (!sbi)
1613                 return -ENOMEM;
1614
1615         sbi->s_blockgroup_lock =
1616                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1617         if (!sbi->s_blockgroup_lock) {
1618                 kfree(sbi);
1619                 return -ENOMEM;
1620         }
1621         sb->s_fs_info = sbi;
1622         sbi->s_mount_opt = 0;
1623         sbi->s_resuid = EXT3_DEF_RESUID;
1624         sbi->s_resgid = EXT3_DEF_RESGID;
1625         sbi->s_sb_block = sb_block;
1626
1627         unlock_kernel();
1628
1629         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1630         if (!blocksize) {
1631                 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1632                 goto out_fail;
1633         }
1634
1635         /*
1636          * The ext3 superblock will not be buffer aligned for other than 1kB
1637          * block sizes.  We need to calculate the offset from buffer start.
1638          */
1639         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1640                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1641                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1642         } else {
1643                 logic_sb_block = sb_block;
1644         }
1645
1646         if (!(bh = sb_bread(sb, logic_sb_block))) {
1647                 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1648                 goto out_fail;
1649         }
1650         /*
1651          * Note: s_es must be initialized as soon as possible because
1652          *       some ext3 macro-instructions depend on its value
1653          */
1654         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1655         sbi->s_es = es;
1656         sb->s_magic = le16_to_cpu(es->s_magic);
1657         if (sb->s_magic != EXT3_SUPER_MAGIC)
1658                 goto cantfind_ext3;
1659
1660         /* Set defaults before we parse the mount options */
1661         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1662         if (def_mount_opts & EXT3_DEFM_DEBUG)
1663                 set_opt(sbi->s_mount_opt, DEBUG);
1664         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1665                 set_opt(sbi->s_mount_opt, GRPID);
1666         if (def_mount_opts & EXT3_DEFM_UID16)
1667                 set_opt(sbi->s_mount_opt, NO_UID32);
1668 #ifdef CONFIG_EXT3_FS_XATTR
1669         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1670                 set_opt(sbi->s_mount_opt, XATTR_USER);
1671 #endif
1672 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1673         if (def_mount_opts & EXT3_DEFM_ACL)
1674                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1675 #endif
1676         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1677                 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1678         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1679                 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1680         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1681                 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1682
1683         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1684                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1685         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1686                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1687         else
1688                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1689
1690         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1691         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1692
1693         set_opt(sbi->s_mount_opt, RESERVATION);
1694
1695         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1696                             NULL, 0))
1697                 goto failed_mount;
1698
1699         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1700                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1701
1702         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1703             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1704              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1705              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1706                 ext3_msg(sb, KERN_WARNING,
1707                         "warning: feature flags set on rev 0 fs, "
1708                         "running e2fsck is recommended");
1709         /*
1710          * Check feature flags regardless of the revision level, since we
1711          * previously didn't change the revision level when setting the flags,
1712          * so there is a chance incompat flags are set on a rev 0 filesystem.
1713          */
1714         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1715         if (features) {
1716                 ext3_msg(sb, KERN_ERR,
1717                         "error: couldn't mount because of unsupported "
1718                         "optional features (%x)", le32_to_cpu(features));
1719                 goto failed_mount;
1720         }
1721         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1722         if (!(sb->s_flags & MS_RDONLY) && features) {
1723                 ext3_msg(sb, KERN_ERR,
1724                         "error: couldn't mount RDWR because of unsupported "
1725                         "optional features (%x)", le32_to_cpu(features));
1726                 goto failed_mount;
1727         }
1728         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1729
1730         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1731             blocksize > EXT3_MAX_BLOCK_SIZE) {
1732                 ext3_msg(sb, KERN_ERR,
1733                         "error: couldn't mount because of unsupported "
1734                         "filesystem blocksize %d", blocksize);
1735                 goto failed_mount;
1736         }
1737
1738         hblock = bdev_logical_block_size(sb->s_bdev);
1739         if (sb->s_blocksize != blocksize) {
1740                 /*
1741                  * Make sure the blocksize for the filesystem is larger
1742                  * than the hardware sectorsize for the machine.
1743                  */
1744                 if (blocksize < hblock) {
1745                         ext3_msg(sb, KERN_ERR,
1746                                 "error: fsblocksize %d too small for "
1747                                 "hardware sectorsize %d", blocksize, hblock);
1748                         goto failed_mount;
1749                 }
1750
1751                 brelse (bh);
1752                 if (!sb_set_blocksize(sb, blocksize)) {
1753                         ext3_msg(sb, KERN_ERR,
1754                                 "error: bad blocksize %d", blocksize);
1755                         goto out_fail;
1756                 }
1757                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1758                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1759                 bh = sb_bread(sb, logic_sb_block);
1760                 if (!bh) {
1761                         ext3_msg(sb, KERN_ERR,
1762                                "error: can't read superblock on 2nd try");
1763                         goto failed_mount;
1764                 }
1765                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1766                 sbi->s_es = es;
1767                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1768                         ext3_msg(sb, KERN_ERR,
1769                                 "error: magic mismatch");
1770                         goto failed_mount;
1771                 }
1772         }
1773
1774         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1775
1776         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1777                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1778                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1779         } else {
1780                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1781                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1782                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1783                     (!is_power_of_2(sbi->s_inode_size)) ||
1784                     (sbi->s_inode_size > blocksize)) {
1785                         ext3_msg(sb, KERN_ERR,
1786                                 "error: unsupported inode size: %d",
1787                                 sbi->s_inode_size);
1788                         goto failed_mount;
1789                 }
1790         }
1791         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1792                                    le32_to_cpu(es->s_log_frag_size);
1793         if (blocksize != sbi->s_frag_size) {
1794                 ext3_msg(sb, KERN_ERR,
1795                        "error: fragsize %lu != blocksize %u (unsupported)",
1796                        sbi->s_frag_size, blocksize);
1797                 goto failed_mount;
1798         }
1799         sbi->s_frags_per_block = 1;
1800         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1801         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1802         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1803         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1804                 goto cantfind_ext3;
1805         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1806         if (sbi->s_inodes_per_block == 0)
1807                 goto cantfind_ext3;
1808         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1809                                         sbi->s_inodes_per_block;
1810         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1811         sbi->s_sbh = bh;
1812         sbi->s_mount_state = le16_to_cpu(es->s_state);
1813         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1814         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1815         for (i=0; i < 4; i++)
1816                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1817         sbi->s_def_hash_version = es->s_def_hash_version;
1818         i = le32_to_cpu(es->s_flags);
1819         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1820                 sbi->s_hash_unsigned = 3;
1821         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1822 #ifdef __CHAR_UNSIGNED__
1823                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1824                 sbi->s_hash_unsigned = 3;
1825 #else
1826                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1827 #endif
1828         }
1829
1830         if (sbi->s_blocks_per_group > blocksize * 8) {
1831                 ext3_msg(sb, KERN_ERR,
1832                         "#blocks per group too big: %lu",
1833                         sbi->s_blocks_per_group);
1834                 goto failed_mount;
1835         }
1836         if (sbi->s_frags_per_group > blocksize * 8) {
1837                 ext3_msg(sb, KERN_ERR,
1838                         "error: #fragments per group too big: %lu",
1839                         sbi->s_frags_per_group);
1840                 goto failed_mount;
1841         }
1842         if (sbi->s_inodes_per_group > blocksize * 8) {
1843                 ext3_msg(sb, KERN_ERR,
1844                         "error: #inodes per group too big: %lu",
1845                         sbi->s_inodes_per_group);
1846                 goto failed_mount;
1847         }
1848
1849         if (le32_to_cpu(es->s_blocks_count) >
1850                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1851                 ext3_msg(sb, KERN_ERR,
1852                         "error: filesystem is too large to mount safely");
1853                 if (sizeof(sector_t) < 8)
1854                         ext3_msg(sb, KERN_ERR,
1855                                 "error: CONFIG_LBDAF not enabled");
1856                 goto failed_mount;
1857         }
1858
1859         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1860                 goto cantfind_ext3;
1861         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1862                                le32_to_cpu(es->s_first_data_block) - 1)
1863                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1864         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1865                    EXT3_DESC_PER_BLOCK(sb);
1866         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1867                                     GFP_KERNEL);
1868         if (sbi->s_group_desc == NULL) {
1869                 ext3_msg(sb, KERN_ERR,
1870                         "error: not enough memory");
1871                 goto failed_mount;
1872         }
1873
1874         bgl_lock_init(sbi->s_blockgroup_lock);
1875
1876         for (i = 0; i < db_count; i++) {
1877                 block = descriptor_loc(sb, logic_sb_block, i);
1878                 sbi->s_group_desc[i] = sb_bread(sb, block);
1879                 if (!sbi->s_group_desc[i]) {
1880                         ext3_msg(sb, KERN_ERR,
1881                                 "error: can't read group descriptor %d", i);
1882                         db_count = i;
1883                         goto failed_mount2;
1884                 }
1885         }
1886         if (!ext3_check_descriptors (sb)) {
1887                 ext3_msg(sb, KERN_ERR,
1888                         "error: group descriptors corrupted");
1889                 goto failed_mount2;
1890         }
1891         sbi->s_gdb_count = db_count;
1892         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1893         spin_lock_init(&sbi->s_next_gen_lock);
1894
1895         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1896                         ext3_count_free_blocks(sb));
1897         if (!err) {
1898                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1899                                 ext3_count_free_inodes(sb));
1900         }
1901         if (!err) {
1902                 err = percpu_counter_init(&sbi->s_dirs_counter,
1903                                 ext3_count_dirs(sb));
1904         }
1905         if (err) {
1906                 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
1907                 goto failed_mount3;
1908         }
1909
1910         /* per fileystem reservation list head & lock */
1911         spin_lock_init(&sbi->s_rsv_window_lock);
1912         sbi->s_rsv_window_root = RB_ROOT;
1913         /* Add a single, static dummy reservation to the start of the
1914          * reservation window list --- it gives us a placeholder for
1915          * append-at-start-of-list which makes the allocation logic
1916          * _much_ simpler. */
1917         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1918         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1919         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1920         sbi->s_rsv_window_head.rsv_goal_size = 0;
1921         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1922
1923         /*
1924          * set up enough so that it can read an inode
1925          */
1926         sb->s_op = &ext3_sops;
1927         sb->s_export_op = &ext3_export_ops;
1928         sb->s_xattr = ext3_xattr_handlers;
1929 #ifdef CONFIG_QUOTA
1930         sb->s_qcop = &ext3_qctl_operations;
1931         sb->dq_op = &ext3_quota_operations;
1932 #endif
1933         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1934         mutex_init(&sbi->s_orphan_lock);
1935         mutex_init(&sbi->s_resize_lock);
1936
1937         sb->s_root = NULL;
1938
1939         needs_recovery = (es->s_last_orphan != 0 ||
1940                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1941                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1942
1943         /*
1944          * The first inode we look at is the journal inode.  Don't try
1945          * root first: it may be modified in the journal!
1946          */
1947         if (!test_opt(sb, NOLOAD) &&
1948             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1949                 if (ext3_load_journal(sb, es, journal_devnum))
1950                         goto failed_mount3;
1951         } else if (journal_inum) {
1952                 if (ext3_create_journal(sb, es, journal_inum))
1953                         goto failed_mount3;
1954         } else {
1955                 if (!silent)
1956                         ext3_msg(sb, KERN_ERR,
1957                                 "error: no journal found. "
1958                                 "mounting ext3 over ext2?");
1959                 goto failed_mount3;
1960         }
1961
1962         /* We have now updated the journal if required, so we can
1963          * validate the data journaling mode. */
1964         switch (test_opt(sb, DATA_FLAGS)) {
1965         case 0:
1966                 /* No mode set, assume a default based on the journal
1967                    capabilities: ORDERED_DATA if the journal can
1968                    cope, else JOURNAL_DATA */
1969                 if (journal_check_available_features
1970                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1971                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1972                 else
1973                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1974                 break;
1975
1976         case EXT3_MOUNT_ORDERED_DATA:
1977         case EXT3_MOUNT_WRITEBACK_DATA:
1978                 if (!journal_check_available_features
1979                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1980                         ext3_msg(sb, KERN_ERR,
1981                                 "error: journal does not support "
1982                                 "requested data journaling mode");
1983                         goto failed_mount4;
1984                 }
1985         default:
1986                 break;
1987         }
1988
1989         if (test_opt(sb, NOBH)) {
1990                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1991                         ext3_msg(sb, KERN_WARNING,
1992                                 "warning: ignoring nobh option - "
1993                                 "it is supported only with writeback mode");
1994                         clear_opt(sbi->s_mount_opt, NOBH);
1995                 }
1996         }
1997         /*
1998          * The journal_load will have done any necessary log recovery,
1999          * so we can safely mount the rest of the filesystem now.
2000          */
2001
2002         root = ext3_iget(sb, EXT3_ROOT_INO);
2003         if (IS_ERR(root)) {
2004                 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2005                 ret = PTR_ERR(root);
2006                 goto failed_mount4;
2007         }
2008         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2009                 iput(root);
2010                 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2011                 goto failed_mount4;
2012         }
2013         sb->s_root = d_alloc_root(root);
2014         if (!sb->s_root) {
2015                 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2016                 iput(root);
2017                 ret = -ENOMEM;
2018                 goto failed_mount4;
2019         }
2020
2021         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2022
2023         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2024         ext3_orphan_cleanup(sb, es);
2025         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2026         if (needs_recovery)
2027                 ext3_msg(sb, KERN_INFO, "recovery complete");
2028         ext3_mark_recovery_complete(sb, es);
2029         ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2030                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2031                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2032                 "writeback");
2033
2034         lock_kernel();
2035         return 0;
2036
2037 cantfind_ext3:
2038         if (!silent)
2039                 ext3_msg(sb, KERN_INFO,
2040                         "error: can't find ext3 filesystem on dev %s.",
2041                        sb->s_id);
2042         goto failed_mount;
2043
2044 failed_mount4:
2045         journal_destroy(sbi->s_journal);
2046 failed_mount3:
2047         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2048         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2049         percpu_counter_destroy(&sbi->s_dirs_counter);
2050 failed_mount2:
2051         for (i = 0; i < db_count; i++)
2052                 brelse(sbi->s_group_desc[i]);
2053         kfree(sbi->s_group_desc);
2054 failed_mount:
2055 #ifdef CONFIG_QUOTA
2056         for (i = 0; i < MAXQUOTAS; i++)
2057                 kfree(sbi->s_qf_names[i]);
2058 #endif
2059         ext3_blkdev_remove(sbi);
2060         brelse(bh);
2061 out_fail:
2062         sb->s_fs_info = NULL;
2063         kfree(sbi->s_blockgroup_lock);
2064         kfree(sbi);
2065         lock_kernel();
2066         return ret;
2067 }
2068
2069 /*
2070  * Setup any per-fs journal parameters now.  We'll do this both on
2071  * initial mount, once the journal has been initialised but before we've
2072  * done any recovery; and again on any subsequent remount.
2073  */
2074 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2075 {
2076         struct ext3_sb_info *sbi = EXT3_SB(sb);
2077
2078         if (sbi->s_commit_interval)
2079                 journal->j_commit_interval = sbi->s_commit_interval;
2080         /* We could also set up an ext3-specific default for the commit
2081          * interval here, but for now we'll just fall back to the jbd
2082          * default. */
2083
2084         spin_lock(&journal->j_state_lock);
2085         if (test_opt(sb, BARRIER))
2086                 journal->j_flags |= JFS_BARRIER;
2087         else
2088                 journal->j_flags &= ~JFS_BARRIER;
2089         if (test_opt(sb, DATA_ERR_ABORT))
2090                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2091         else
2092                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2093         spin_unlock(&journal->j_state_lock);
2094 }
2095
2096 static journal_t *ext3_get_journal(struct super_block *sb,
2097                                    unsigned int journal_inum)
2098 {
2099         struct inode *journal_inode;
2100         journal_t *journal;
2101
2102         /* First, test for the existence of a valid inode on disk.  Bad
2103          * things happen if we iget() an unused inode, as the subsequent
2104          * iput() will try to delete it. */
2105
2106         journal_inode = ext3_iget(sb, journal_inum);
2107         if (IS_ERR(journal_inode)) {
2108                 ext3_msg(sb, KERN_ERR, "error: no journal found");
2109                 return NULL;
2110         }
2111         if (!journal_inode->i_nlink) {
2112                 make_bad_inode(journal_inode);
2113                 iput(journal_inode);
2114                 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2115                 return NULL;
2116         }
2117
2118         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2119                   journal_inode, journal_inode->i_size);
2120         if (!S_ISREG(journal_inode->i_mode)) {
2121                 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2122                 iput(journal_inode);
2123                 return NULL;
2124         }
2125
2126         journal = journal_init_inode(journal_inode);
2127         if (!journal) {
2128                 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2129                 iput(journal_inode);
2130                 return NULL;
2131         }
2132         journal->j_private = sb;
2133         ext3_init_journal_params(sb, journal);
2134         return journal;
2135 }
2136
2137 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2138                                        dev_t j_dev)
2139 {
2140         struct buffer_head * bh;
2141         journal_t *journal;
2142         ext3_fsblk_t start;
2143         ext3_fsblk_t len;
2144         int hblock, blocksize;
2145         ext3_fsblk_t sb_block;
2146         unsigned long offset;
2147         struct ext3_super_block * es;
2148         struct block_device *bdev;
2149
2150         bdev = ext3_blkdev_get(j_dev, sb);
2151         if (bdev == NULL)
2152                 return NULL;
2153
2154         if (bd_claim(bdev, sb)) {
2155                 ext3_msg(sb, KERN_ERR,
2156                         "error: failed to claim external journal device");
2157                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2158                 return NULL;
2159         }
2160
2161         blocksize = sb->s_blocksize;
2162         hblock = bdev_logical_block_size(bdev);
2163         if (blocksize < hblock) {
2164                 ext3_msg(sb, KERN_ERR,
2165                         "error: blocksize too small for journal device");
2166                 goto out_bdev;
2167         }
2168
2169         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2170         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2171         set_blocksize(bdev, blocksize);
2172         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2173                 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2174                         "external journal");
2175                 goto out_bdev;
2176         }
2177
2178         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2179         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2180             !(le32_to_cpu(es->s_feature_incompat) &
2181               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2182                 ext3_msg(sb, KERN_ERR, "error: external journal has "
2183                         "bad superblock");
2184                 brelse(bh);
2185                 goto out_bdev;
2186         }
2187
2188         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2189                 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2190                 brelse(bh);
2191                 goto out_bdev;
2192         }
2193
2194         len = le32_to_cpu(es->s_blocks_count);
2195         start = sb_block + 1;
2196         brelse(bh);     /* we're done with the superblock */
2197
2198         journal = journal_init_dev(bdev, sb->s_bdev,
2199                                         start, len, blocksize);
2200         if (!journal) {
2201                 ext3_msg(sb, KERN_ERR,
2202                         "error: failed to create device journal");
2203                 goto out_bdev;
2204         }
2205         journal->j_private = sb;
2206         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2207         wait_on_buffer(journal->j_sb_buffer);
2208         if (!buffer_uptodate(journal->j_sb_buffer)) {
2209                 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2210                 goto out_journal;
2211         }
2212         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2213                 ext3_msg(sb, KERN_ERR,
2214                         "error: external journal has more than one "
2215                         "user (unsupported) - %d",
2216                         be32_to_cpu(journal->j_superblock->s_nr_users));
2217                 goto out_journal;
2218         }
2219         EXT3_SB(sb)->journal_bdev = bdev;
2220         ext3_init_journal_params(sb, journal);
2221         return journal;
2222 out_journal:
2223         journal_destroy(journal);
2224 out_bdev:
2225         ext3_blkdev_put(bdev);
2226         return NULL;
2227 }
2228
2229 static int ext3_load_journal(struct super_block *sb,
2230                              struct ext3_super_block *es,
2231                              unsigned long journal_devnum)
2232 {
2233         journal_t *journal;
2234         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2235         dev_t journal_dev;
2236         int err = 0;
2237         int really_read_only;
2238
2239         if (journal_devnum &&
2240             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2241                 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2242                         "numbers have changed");
2243                 journal_dev = new_decode_dev(journal_devnum);
2244         } else
2245                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2246
2247         really_read_only = bdev_read_only(sb->s_bdev);
2248
2249         /*
2250          * Are we loading a blank journal or performing recovery after a
2251          * crash?  For recovery, we need to check in advance whether we
2252          * can get read-write access to the device.
2253          */
2254
2255         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2256                 if (sb->s_flags & MS_RDONLY) {
2257                         ext3_msg(sb, KERN_INFO,
2258                                 "recovery required on readonly filesystem");
2259                         if (really_read_only) {
2260                                 ext3_msg(sb, KERN_ERR, "error: write access "
2261                                         "unavailable, cannot proceed");
2262                                 return -EROFS;
2263                         }
2264                         ext3_msg(sb, KERN_INFO,
2265                                 "write access will be enabled during recovery");
2266                 }
2267         }
2268
2269         if (journal_inum && journal_dev) {
2270                 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2271                        "and inode journals");
2272                 return -EINVAL;
2273         }
2274
2275         if (journal_inum) {
2276                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2277                         return -EINVAL;
2278         } else {
2279                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2280                         return -EINVAL;
2281         }
2282
2283         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2284                 err = journal_update_format(journal);
2285                 if (err)  {
2286                         ext3_msg(sb, KERN_ERR, "error updating journal");
2287                         journal_destroy(journal);
2288                         return err;
2289                 }
2290         }
2291
2292         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2293                 err = journal_wipe(journal, !really_read_only);
2294         if (!err)
2295                 err = journal_load(journal);
2296
2297         if (err) {
2298                 ext3_msg(sb, KERN_ERR, "error loading journal");
2299                 journal_destroy(journal);
2300                 return err;
2301         }
2302
2303         EXT3_SB(sb)->s_journal = journal;
2304         ext3_clear_journal_err(sb, es);
2305
2306         if (journal_devnum &&
2307             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2308                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2309
2310                 /* Make sure we flush the recovery flag to disk. */
2311                 ext3_commit_super(sb, es, 1);
2312         }
2313
2314         return 0;
2315 }
2316
2317 static int ext3_create_journal(struct super_block *sb,
2318                                struct ext3_super_block *es,
2319                                unsigned int journal_inum)
2320 {
2321         journal_t *journal;
2322         int err;
2323
2324         if (sb->s_flags & MS_RDONLY) {
2325                 ext3_msg(sb, KERN_ERR,
2326                         "error: readonly filesystem when trying to "
2327                         "create journal");
2328                 return -EROFS;
2329         }
2330
2331         journal = ext3_get_journal(sb, journal_inum);
2332         if (!journal)
2333                 return -EINVAL;
2334
2335         ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2336                journal_inum);
2337
2338         err = journal_create(journal);
2339         if (err) {
2340                 ext3_msg(sb, KERN_ERR, "error creating journal");
2341                 journal_destroy(journal);
2342                 return -EIO;
2343         }
2344
2345         EXT3_SB(sb)->s_journal = journal;
2346
2347         ext3_update_dynamic_rev(sb);
2348         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2349         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2350
2351         es->s_journal_inum = cpu_to_le32(journal_inum);
2352
2353         /* Make sure we flush the recovery flag to disk. */
2354         ext3_commit_super(sb, es, 1);
2355
2356         return 0;
2357 }
2358
2359 static int ext3_commit_super(struct super_block *sb,
2360                                struct ext3_super_block *es,
2361                                int sync)
2362 {
2363         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2364         int error = 0;
2365
2366         if (!sbh)
2367                 return error;
2368         /*
2369          * If the file system is mounted read-only, don't update the
2370          * superblock write time.  This avoids updating the superblock
2371          * write time when we are mounting the root file system
2372          * read/only but we need to replay the journal; at that point,
2373          * for people who are east of GMT and who make their clock
2374          * tick in localtime for Windows bug-for-bug compatibility,
2375          * the clock is set in the future, and this will cause e2fsck
2376          * to complain and force a full file system check.
2377          */
2378         if (!(sb->s_flags & MS_RDONLY))
2379                 es->s_wtime = cpu_to_le32(get_seconds());
2380         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2381         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2382         BUFFER_TRACE(sbh, "marking dirty");
2383         mark_buffer_dirty(sbh);
2384         if (sync)
2385                 error = sync_dirty_buffer(sbh);
2386         return error;
2387 }
2388
2389
2390 /*
2391  * Have we just finished recovery?  If so, and if we are mounting (or
2392  * remounting) the filesystem readonly, then we will end up with a
2393  * consistent fs on disk.  Record that fact.
2394  */
2395 static void ext3_mark_recovery_complete(struct super_block * sb,
2396                                         struct ext3_super_block * es)
2397 {
2398         journal_t *journal = EXT3_SB(sb)->s_journal;
2399
2400         journal_lock_updates(journal);
2401         if (journal_flush(journal) < 0)
2402                 goto out;
2403
2404         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2405             sb->s_flags & MS_RDONLY) {
2406                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2407                 ext3_commit_super(sb, es, 1);
2408         }
2409
2410 out:
2411         journal_unlock_updates(journal);
2412 }
2413
2414 /*
2415  * If we are mounting (or read-write remounting) a filesystem whose journal
2416  * has recorded an error from a previous lifetime, move that error to the
2417  * main filesystem now.
2418  */
2419 static void ext3_clear_journal_err(struct super_block *sb,
2420                                    struct ext3_super_block *es)
2421 {
2422         journal_t *journal;
2423         int j_errno;
2424         const char *errstr;
2425
2426         journal = EXT3_SB(sb)->s_journal;
2427
2428         /*
2429          * Now check for any error status which may have been recorded in the
2430          * journal by a prior ext3_error() or ext3_abort()
2431          */
2432
2433         j_errno = journal_errno(journal);
2434         if (j_errno) {
2435                 char nbuf[16];
2436
2437                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2438                 ext3_warning(sb, __func__, "Filesystem error recorded "
2439                              "from previous mount: %s", errstr);
2440                 ext3_warning(sb, __func__, "Marking fs in need of "
2441                              "filesystem check.");
2442
2443                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2444                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2445                 ext3_commit_super (sb, es, 1);
2446
2447                 journal_clear_err(journal);
2448         }
2449 }
2450
2451 /*
2452  * Force the running and committing transactions to commit,
2453  * and wait on the commit.
2454  */
2455 int ext3_force_commit(struct super_block *sb)
2456 {
2457         journal_t *journal;
2458         int ret;
2459
2460         if (sb->s_flags & MS_RDONLY)
2461                 return 0;
2462
2463         journal = EXT3_SB(sb)->s_journal;
2464         ret = ext3_journal_force_commit(journal);
2465         return ret;
2466 }
2467
2468 static int ext3_sync_fs(struct super_block *sb, int wait)
2469 {
2470         tid_t target;
2471
2472         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2473                 if (wait)
2474                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2475         }
2476         return 0;
2477 }
2478
2479 /*
2480  * LVM calls this function before a (read-only) snapshot is created.  This
2481  * gives us a chance to flush the journal completely and mark the fs clean.
2482  */
2483 static int ext3_freeze(struct super_block *sb)
2484 {
2485         int error = 0;
2486         journal_t *journal;
2487
2488         if (!(sb->s_flags & MS_RDONLY)) {
2489                 journal = EXT3_SB(sb)->s_journal;
2490
2491                 /* Now we set up the journal barrier. */
2492                 journal_lock_updates(journal);
2493
2494                 /*
2495                  * We don't want to clear needs_recovery flag when we failed
2496                  * to flush the journal.
2497                  */
2498                 error = journal_flush(journal);
2499                 if (error < 0)
2500                         goto out;
2501
2502                 /* Journal blocked and flushed, clear needs_recovery flag. */
2503                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2504                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2505                 if (error)
2506                         goto out;
2507         }
2508         return 0;
2509
2510 out:
2511         journal_unlock_updates(journal);
2512         return error;
2513 }
2514
2515 /*
2516  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2517  * flag here, even though the filesystem is not technically dirty yet.
2518  */
2519 static int ext3_unfreeze(struct super_block *sb)
2520 {
2521         if (!(sb->s_flags & MS_RDONLY)) {
2522                 lock_super(sb);
2523                 /* Reser the needs_recovery flag before the fs is unlocked. */
2524                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2525                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2526                 unlock_super(sb);
2527                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2528         }
2529         return 0;
2530 }
2531
2532 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2533 {
2534         struct ext3_super_block * es;
2535         struct ext3_sb_info *sbi = EXT3_SB(sb);
2536         ext3_fsblk_t n_blocks_count = 0;
2537         unsigned long old_sb_flags;
2538         struct ext3_mount_options old_opts;
2539         int err;
2540 #ifdef CONFIG_QUOTA
2541         int i;
2542 #endif
2543
2544         lock_kernel();
2545
2546         /* Store the original options */
2547         lock_super(sb);
2548         old_sb_flags = sb->s_flags;
2549         old_opts.s_mount_opt = sbi->s_mount_opt;
2550         old_opts.s_resuid = sbi->s_resuid;
2551         old_opts.s_resgid = sbi->s_resgid;
2552         old_opts.s_commit_interval = sbi->s_commit_interval;
2553 #ifdef CONFIG_QUOTA
2554         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2555         for (i = 0; i < MAXQUOTAS; i++)
2556                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2557 #endif
2558
2559         /*
2560          * Allow the "check" option to be passed as a remount option.
2561          */
2562         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2563                 err = -EINVAL;
2564                 goto restore_opts;
2565         }
2566
2567         if (test_opt(sb, ABORT))
2568                 ext3_abort(sb, __func__, "Abort forced by user");
2569
2570         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2571                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2572
2573         es = sbi->s_es;
2574
2575         ext3_init_journal_params(sb, sbi->s_journal);
2576
2577         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2578                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2579                 if (test_opt(sb, ABORT)) {
2580                         err = -EROFS;
2581                         goto restore_opts;
2582                 }
2583
2584                 if (*flags & MS_RDONLY) {
2585                         /*
2586                          * First of all, the unconditional stuff we have to do
2587                          * to disable replay of the journal when we next remount
2588                          */
2589                         sb->s_flags |= MS_RDONLY;
2590
2591                         /*
2592                          * OK, test if we are remounting a valid rw partition
2593                          * readonly, and if so set the rdonly flag and then
2594                          * mark the partition as valid again.
2595                          */
2596                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2597                             (sbi->s_mount_state & EXT3_VALID_FS))
2598                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2599
2600                         ext3_mark_recovery_complete(sb, es);
2601                 } else {
2602                         __le32 ret;
2603                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2604                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2605                                 ext3_msg(sb, KERN_WARNING,
2606                                         "warning: couldn't remount RDWR "
2607                                         "because of unsupported optional "
2608                                         "features (%x)", le32_to_cpu(ret));
2609                                 err = -EROFS;
2610                                 goto restore_opts;
2611                         }
2612
2613                         /*
2614                          * If we have an unprocessed orphan list hanging
2615                          * around from a previously readonly bdev mount,
2616                          * require a full umount/remount for now.
2617                          */
2618                         if (es->s_last_orphan) {
2619                                 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2620                                        "remount RDWR because of unprocessed "
2621                                        "orphan inode list.  Please "
2622                                        "umount/remount instead.");
2623                                 err = -EINVAL;
2624                                 goto restore_opts;
2625                         }
2626
2627                         /*
2628                          * Mounting a RDONLY partition read-write, so reread
2629                          * and store the current valid flag.  (It may have
2630                          * been changed by e2fsck since we originally mounted
2631                          * the partition.)
2632                          */
2633                         ext3_clear_journal_err(sb, es);
2634                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2635                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2636                                 goto restore_opts;
2637                         if (!ext3_setup_super (sb, es, 0))
2638                                 sb->s_flags &= ~MS_RDONLY;
2639                 }
2640         }
2641 #ifdef CONFIG_QUOTA
2642         /* Release old quota file names */
2643         for (i = 0; i < MAXQUOTAS; i++)
2644                 if (old_opts.s_qf_names[i] &&
2645                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2646                         kfree(old_opts.s_qf_names[i]);
2647 #endif
2648         unlock_super(sb);
2649         unlock_kernel();
2650         return 0;
2651 restore_opts:
2652         sb->s_flags = old_sb_flags;
2653         sbi->s_mount_opt = old_opts.s_mount_opt;
2654         sbi->s_resuid = old_opts.s_resuid;
2655         sbi->s_resgid = old_opts.s_resgid;
2656         sbi->s_commit_interval = old_opts.s_commit_interval;
2657 #ifdef CONFIG_QUOTA
2658         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2659         for (i = 0; i < MAXQUOTAS; i++) {
2660                 if (sbi->s_qf_names[i] &&
2661                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2662                         kfree(sbi->s_qf_names[i]);
2663                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2664         }
2665 #endif
2666         unlock_super(sb);
2667         unlock_kernel();
2668         return err;
2669 }
2670
2671 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2672 {
2673         struct super_block *sb = dentry->d_sb;
2674         struct ext3_sb_info *sbi = EXT3_SB(sb);
2675         struct ext3_super_block *es = sbi->s_es;
2676         u64 fsid;
2677
2678         if (test_opt(sb, MINIX_DF)) {
2679                 sbi->s_overhead_last = 0;
2680         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2681                 unsigned long ngroups = sbi->s_groups_count, i;
2682                 ext3_fsblk_t overhead = 0;
2683                 smp_rmb();
2684
2685                 /*
2686                  * Compute the overhead (FS structures).  This is constant
2687                  * for a given filesystem unless the number of block groups
2688                  * changes so we cache the previous value until it does.
2689                  */
2690
2691                 /*
2692                  * All of the blocks before first_data_block are
2693                  * overhead
2694                  */
2695                 overhead = le32_to_cpu(es->s_first_data_block);
2696
2697                 /*
2698                  * Add the overhead attributed to the superblock and
2699                  * block group descriptors.  If the sparse superblocks
2700                  * feature is turned on, then not all groups have this.
2701                  */
2702                 for (i = 0; i < ngroups; i++) {
2703                         overhead += ext3_bg_has_super(sb, i) +
2704                                 ext3_bg_num_gdb(sb, i);
2705                         cond_resched();
2706                 }
2707
2708                 /*
2709                  * Every block group has an inode bitmap, a block
2710                  * bitmap, and an inode table.
2711                  */
2712                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2713                 sbi->s_overhead_last = overhead;
2714                 smp_wmb();
2715                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2716         }
2717
2718         buf->f_type = EXT3_SUPER_MAGIC;
2719         buf->f_bsize = sb->s_blocksize;
2720         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2721         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2722         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2723         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2724                 buf->f_bavail = 0;
2725         buf->f_files = le32_to_cpu(es->s_inodes_count);
2726         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2727         buf->f_namelen = EXT3_NAME_LEN;
2728         fsid = le64_to_cpup((void *)es->s_uuid) ^
2729                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2730         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2731         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2732         return 0;
2733 }
2734
2735 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2736  * is locked for write. Otherwise the are possible deadlocks:
2737  * Process 1                         Process 2
2738  * ext3_create()                     quota_sync()
2739  *   journal_start()                   write_dquot()
2740  *   vfs_dq_init()                       down(dqio_mutex)
2741  *     down(dqio_mutex)                    journal_start()
2742  *
2743  */
2744
2745 #ifdef CONFIG_QUOTA
2746
2747 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2748 {
2749         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2750 }
2751
2752 static int ext3_write_dquot(struct dquot *dquot)
2753 {
2754         int ret, err;
2755         handle_t *handle;
2756         struct inode *inode;
2757
2758         inode = dquot_to_inode(dquot);
2759         handle = ext3_journal_start(inode,
2760                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2761         if (IS_ERR(handle))
2762                 return PTR_ERR(handle);
2763         ret = dquot_commit(dquot);
2764         err = ext3_journal_stop(handle);
2765         if (!ret)
2766                 ret = err;
2767         return ret;
2768 }
2769
2770 static int ext3_acquire_dquot(struct dquot *dquot)
2771 {
2772         int ret, err;
2773         handle_t *handle;
2774
2775         handle = ext3_journal_start(dquot_to_inode(dquot),
2776                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2777         if (IS_ERR(handle))
2778                 return PTR_ERR(handle);
2779         ret = dquot_acquire(dquot);
2780         err = ext3_journal_stop(handle);
2781         if (!ret)
2782                 ret = err;
2783         return ret;
2784 }
2785
2786 static int ext3_release_dquot(struct dquot *dquot)
2787 {
2788         int ret, err;
2789         handle_t *handle;
2790
2791         handle = ext3_journal_start(dquot_to_inode(dquot),
2792                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2793         if (IS_ERR(handle)) {
2794                 /* Release dquot anyway to avoid endless cycle in dqput() */
2795                 dquot_release(dquot);
2796                 return PTR_ERR(handle);
2797         }
2798         ret = dquot_release(dquot);
2799         err = ext3_journal_stop(handle);
2800         if (!ret)
2801                 ret = err;
2802         return ret;
2803 }
2804
2805 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2806 {
2807         /* Are we journaling quotas? */
2808         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2809             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2810                 dquot_mark_dquot_dirty(dquot);
2811                 return ext3_write_dquot(dquot);
2812         } else {
2813                 return dquot_mark_dquot_dirty(dquot);
2814         }
2815 }
2816
2817 static int ext3_write_info(struct super_block *sb, int type)
2818 {
2819         int ret, err;
2820         handle_t *handle;
2821
2822         /* Data block + inode block */
2823         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2824         if (IS_ERR(handle))
2825                 return PTR_ERR(handle);
2826         ret = dquot_commit_info(sb, type);
2827         err = ext3_journal_stop(handle);
2828         if (!ret)
2829                 ret = err;
2830         return ret;
2831 }
2832
2833 /*
2834  * Turn on quotas during mount time - we need to find
2835  * the quota file and such...
2836  */
2837 static int ext3_quota_on_mount(struct super_block *sb, int type)
2838 {
2839         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2840                         EXT3_SB(sb)->s_jquota_fmt, type);
2841 }
2842
2843 /*
2844  * Standard function to be called on quota_on
2845  */
2846 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2847                          char *name, int remount)
2848 {
2849         int err;
2850         struct path path;
2851
2852         if (!test_opt(sb, QUOTA))
2853                 return -EINVAL;
2854         /* When remounting, no checks are needed and in fact, name is NULL */
2855         if (remount)
2856                 return vfs_quota_on(sb, type, format_id, name, remount);
2857
2858         err = kern_path(name, LOOKUP_FOLLOW, &path);
2859         if (err)
2860                 return err;
2861
2862         /* Quotafile not on the same filesystem? */
2863         if (path.mnt->mnt_sb != sb) {
2864                 path_put(&path);
2865                 return -EXDEV;
2866         }
2867         /* Journaling quota? */
2868         if (EXT3_SB(sb)->s_qf_names[type]) {
2869                 /* Quotafile not of fs root? */
2870                 if (path.dentry->d_parent != sb->s_root)
2871                         ext3_msg(sb, KERN_WARNING,
2872                                 "warning: Quota file not on filesystem root. "
2873                                 "Journaled quota will not work.");
2874         }
2875
2876         /*
2877          * When we journal data on quota file, we have to flush journal to see
2878          * all updates to the file when we bypass pagecache...
2879          */
2880         if (ext3_should_journal_data(path.dentry->d_inode)) {
2881                 /*
2882                  * We don't need to lock updates but journal_flush() could
2883                  * otherwise be livelocked...
2884                  */
2885                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2886                 err = journal_flush(EXT3_SB(sb)->s_journal);
2887                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2888                 if (err) {
2889                         path_put(&path);
2890                         return err;
2891                 }
2892         }
2893
2894         err = vfs_quota_on_path(sb, type, format_id, &path);
2895         path_put(&path);
2896         return err;
2897 }
2898
2899 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2900  * acquiring the locks... As quota files are never truncated and quota code
2901  * itself serializes the operations (and noone else should touch the files)
2902  * we don't have to be afraid of races */
2903 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2904                                size_t len, loff_t off)
2905 {
2906         struct inode *inode = sb_dqopt(sb)->files[type];
2907         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2908         int err = 0;
2909         int offset = off & (sb->s_blocksize - 1);
2910         int tocopy;
2911         size_t toread;
2912         struct buffer_head *bh;
2913         loff_t i_size = i_size_read(inode);
2914
2915         if (off > i_size)
2916                 return 0;
2917         if (off+len > i_size)
2918                 len = i_size-off;
2919         toread = len;
2920         while (toread > 0) {
2921                 tocopy = sb->s_blocksize - offset < toread ?
2922                                 sb->s_blocksize - offset : toread;
2923                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2924                 if (err)
2925                         return err;
2926                 if (!bh)        /* A hole? */
2927                         memset(data, 0, tocopy);
2928                 else
2929                         memcpy(data, bh->b_data+offset, tocopy);
2930                 brelse(bh);
2931                 offset = 0;
2932                 toread -= tocopy;
2933                 data += tocopy;
2934                 blk++;
2935         }
2936         return len;
2937 }
2938
2939 /* Write to quotafile (we know the transaction is already started and has
2940  * enough credits) */
2941 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2942                                 const char *data, size_t len, loff_t off)
2943 {
2944         struct inode *inode = sb_dqopt(sb)->files[type];
2945         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2946         int err = 0;
2947         int offset = off & (sb->s_blocksize - 1);
2948         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2949         struct buffer_head *bh;
2950         handle_t *handle = journal_current_handle();
2951
2952         if (!handle) {
2953                 ext3_msg(sb, KERN_WARNING,
2954                         "warning: quota write (off=%llu, len=%llu)"
2955                         " cancelled because transaction is not started.",
2956                         (unsigned long long)off, (unsigned long long)len);
2957                 return -EIO;
2958         }
2959
2960         /*
2961          * Since we account only one data block in transaction credits,
2962          * then it is impossible to cross a block boundary.
2963          */
2964         if (sb->s_blocksize - offset < len) {
2965                 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
2966                         " cancelled because not block aligned",
2967                         (unsigned long long)off, (unsigned long long)len);
2968                 return -EIO;
2969         }
2970         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2971         bh = ext3_bread(handle, inode, blk, 1, &err);
2972         if (!bh)
2973                 goto out;
2974         if (journal_quota) {
2975                 err = ext3_journal_get_write_access(handle, bh);
2976                 if (err) {
2977                         brelse(bh);
2978                         goto out;
2979                 }
2980         }
2981         lock_buffer(bh);
2982         memcpy(bh->b_data+offset, data, len);
2983         flush_dcache_page(bh->b_page);
2984         unlock_buffer(bh);
2985         if (journal_quota)
2986                 err = ext3_journal_dirty_metadata(handle, bh);
2987         else {
2988                 /* Always do at least ordered writes for quotas */
2989                 err = ext3_journal_dirty_data(handle, bh);
2990                 mark_buffer_dirty(bh);
2991         }
2992         brelse(bh);
2993 out:
2994         if (err) {
2995                 mutex_unlock(&inode->i_mutex);
2996                 return err;
2997         }
2998         if (inode->i_size < off + len) {
2999                 i_size_write(inode, off + len);
3000                 EXT3_I(inode)->i_disksize = inode->i_size;
3001         }
3002         inode->i_version++;
3003         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3004         ext3_mark_inode_dirty(handle, inode);
3005         mutex_unlock(&inode->i_mutex);
3006         return len;
3007 }
3008
3009 #endif
3010
3011 static int ext3_get_sb(struct file_system_type *fs_type,
3012         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3013 {
3014         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
3015 }
3016
3017 static struct file_system_type ext3_fs_type = {
3018         .owner          = THIS_MODULE,
3019         .name           = "ext3",
3020         .get_sb         = ext3_get_sb,
3021         .kill_sb        = kill_block_super,
3022         .fs_flags       = FS_REQUIRES_DEV,
3023 };
3024
3025 static int __init init_ext3_fs(void)
3026 {
3027         int err = init_ext3_xattr();
3028         if (err)
3029                 return err;
3030         err = init_inodecache();
3031         if (err)
3032                 goto out1;
3033         err = register_filesystem(&ext3_fs_type);
3034         if (err)
3035                 goto out;
3036         return 0;
3037 out:
3038         destroy_inodecache();
3039 out1:
3040         exit_ext3_xattr();
3041         return err;
3042 }
3043
3044 static void __exit exit_ext3_fs(void)
3045 {
3046         unregister_filesystem(&ext3_fs_type);
3047         destroy_inodecache();
3048         exit_ext3_xattr();
3049 }
3050
3051 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3052 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3053 MODULE_LICENSE("GPL");
3054 module_init(init_ext3_fs)
3055 module_exit(exit_ext3_fs)