[PATCH] ext3: wrong error behavior
[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/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38
39 #include <asm/uaccess.h>
40
41 #include "xattr.h"
42 #include "acl.h"
43 #include "namei.h"
44
45 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
46                              unsigned long journal_devnum);
47 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
48                                unsigned int);
49 static void ext3_commit_super (struct super_block * sb,
50                                struct ext3_super_block * es,
51                                int sync);
52 static void ext3_mark_recovery_complete(struct super_block * sb,
53                                         struct ext3_super_block * es);
54 static void ext3_clear_journal_err(struct super_block * sb,
55                                    struct ext3_super_block * es);
56 static int ext3_sync_fs(struct super_block *sb, int wait);
57 static const char *ext3_decode_error(struct super_block * sb, int errno,
58                                      char nbuf[16]);
59 static int ext3_remount (struct super_block * sb, int * flags, char * data);
60 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
61 static void ext3_unlockfs(struct super_block *sb);
62 static void ext3_write_super (struct super_block * sb);
63 static void ext3_write_super_lockfs(struct super_block *sb);
64
65 /*
66  * Wrappers for journal_start/end.
67  *
68  * The only special thing we need to do here is to make sure that all
69  * journal_end calls result in the superblock being marked dirty, so
70  * that sync() will call the filesystem's write_super callback if
71  * appropriate.
72  */
73 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
74 {
75         journal_t *journal;
76
77         if (sb->s_flags & MS_RDONLY)
78                 return ERR_PTR(-EROFS);
79
80         /* Special case here: if the journal has aborted behind our
81          * backs (eg. EIO in the commit thread), then we still need to
82          * take the FS itself readonly cleanly. */
83         journal = EXT3_SB(sb)->s_journal;
84         if (is_journal_aborted(journal)) {
85                 ext3_abort(sb, __FUNCTION__,
86                            "Detected aborted journal");
87                 return ERR_PTR(-EROFS);
88         }
89
90         return journal_start(journal, nblocks);
91 }
92
93 /*
94  * The only special thing we need to do here is to make sure that all
95  * journal_stop calls result in the superblock being marked dirty, so
96  * that sync() will call the filesystem's write_super callback if
97  * appropriate.
98  */
99 int __ext3_journal_stop(const char *where, handle_t *handle)
100 {
101         struct super_block *sb;
102         int err;
103         int rc;
104
105         sb = handle->h_transaction->t_journal->j_private;
106         err = handle->h_err;
107         rc = journal_stop(handle);
108
109         if (!err)
110                 err = rc;
111         if (err)
112                 __ext3_std_error(sb, where, err);
113         return err;
114 }
115
116 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
117                 struct buffer_head *bh, handle_t *handle, int err)
118 {
119         char nbuf[16];
120         const char *errstr = ext3_decode_error(NULL, err, nbuf);
121
122         if (bh)
123                 BUFFER_TRACE(bh, "abort");
124
125         if (!handle->h_err)
126                 handle->h_err = err;
127
128         if (is_handle_aborted(handle))
129                 return;
130
131         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
132                caller, errstr, err_fn);
133
134         journal_abort_handle(handle);
135 }
136
137 /* Deal with the reporting of failure conditions on a filesystem such as
138  * inconsistencies detected or read IO failures.
139  *
140  * On ext2, we can store the error state of the filesystem in the
141  * superblock.  That is not possible on ext3, because we may have other
142  * write ordering constraints on the superblock which prevent us from
143  * writing it out straight away; and given that the journal is about to
144  * be aborted, we can't rely on the current, or future, transactions to
145  * write out the superblock safely.
146  *
147  * We'll just use the journal_abort() error code to record an error in
148  * the journal instead.  On recovery, the journal will compain about
149  * that error until we've noted it down and cleared it.
150  */
151
152 static void ext3_handle_error(struct super_block *sb)
153 {
154         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
155
156         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
157         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
158
159         if (sb->s_flags & MS_RDONLY)
160                 return;
161
162         if (!test_opt (sb, ERRORS_CONT)) {
163                 journal_t *journal = EXT3_SB(sb)->s_journal;
164
165                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
166                 if (journal)
167                         journal_abort(journal, -EIO);
168         }
169         if (test_opt (sb, ERRORS_RO)) {
170                 printk (KERN_CRIT "Remounting filesystem read-only\n");
171                 sb->s_flags |= MS_RDONLY;
172         }
173         ext3_commit_super(sb, es, 1);
174         if (test_opt(sb, ERRORS_PANIC))
175                 panic("EXT3-fs (device %s): panic forced after error\n",
176                         sb->s_id);
177 }
178
179 void ext3_error (struct super_block * sb, const char * function,
180                  const char * fmt, ...)
181 {
182         va_list args;
183
184         va_start(args, fmt);
185         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
186         vprintk(fmt, args);
187         printk("\n");
188         va_end(args);
189
190         ext3_handle_error(sb);
191 }
192
193 static const char *ext3_decode_error(struct super_block * sb, int errno,
194                                      char nbuf[16])
195 {
196         char *errstr = NULL;
197
198         switch (errno) {
199         case -EIO:
200                 errstr = "IO failure";
201                 break;
202         case -ENOMEM:
203                 errstr = "Out of memory";
204                 break;
205         case -EROFS:
206                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
207                         errstr = "Journal has aborted";
208                 else
209                         errstr = "Readonly filesystem";
210                 break;
211         default:
212                 /* If the caller passed in an extra buffer for unknown
213                  * errors, textualise them now.  Else we just return
214                  * NULL. */
215                 if (nbuf) {
216                         /* Check for truncated error codes... */
217                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
218                                 errstr = nbuf;
219                 }
220                 break;
221         }
222
223         return errstr;
224 }
225
226 /* __ext3_std_error decodes expected errors from journaling functions
227  * automatically and invokes the appropriate error response.  */
228
229 void __ext3_std_error (struct super_block * sb, const char * function,
230                        int errno)
231 {
232         char nbuf[16];
233         const char *errstr;
234
235         /* Special case: if the error is EROFS, and we're not already
236          * inside a transaction, then there's really no point in logging
237          * an error. */
238         if (errno == -EROFS && journal_current_handle() == NULL &&
239             (sb->s_flags & MS_RDONLY))
240                 return;
241
242         errstr = ext3_decode_error(sb, errno, nbuf);
243         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
244                 sb->s_id, function, errstr);
245
246         ext3_handle_error(sb);
247 }
248
249 /*
250  * ext3_abort is a much stronger failure handler than ext3_error.  The
251  * abort function may be used to deal with unrecoverable failures such
252  * as journal IO errors or ENOMEM at a critical moment in log management.
253  *
254  * We unconditionally force the filesystem into an ABORT|READONLY state,
255  * unless the error response on the fs has been set to panic in which
256  * case we take the easy way out and panic immediately.
257  */
258
259 void ext3_abort (struct super_block * sb, const char * function,
260                  const char * fmt, ...)
261 {
262         va_list args;
263
264         printk (KERN_CRIT "ext3_abort called.\n");
265
266         va_start(args, fmt);
267         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
268         vprintk(fmt, args);
269         printk("\n");
270         va_end(args);
271
272         if (test_opt(sb, ERRORS_PANIC))
273                 panic("EXT3-fs panic from previous error\n");
274
275         if (sb->s_flags & MS_RDONLY)
276                 return;
277
278         printk(KERN_CRIT "Remounting filesystem read-only\n");
279         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
280         sb->s_flags |= MS_RDONLY;
281         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
282         journal_abort(EXT3_SB(sb)->s_journal, -EIO);
283 }
284
285 void ext3_warning (struct super_block * sb, const char * function,
286                    const char * fmt, ...)
287 {
288         va_list args;
289
290         va_start(args, fmt);
291         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
292                sb->s_id, function);
293         vprintk(fmt, args);
294         printk("\n");
295         va_end(args);
296 }
297
298 void ext3_update_dynamic_rev(struct super_block *sb)
299 {
300         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
301
302         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
303                 return;
304
305         ext3_warning(sb, __FUNCTION__,
306                      "updating to rev %d because of new feature flag, "
307                      "running e2fsck is recommended",
308                      EXT3_DYNAMIC_REV);
309
310         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
311         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
312         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
313         /* leave es->s_feature_*compat flags alone */
314         /* es->s_uuid will be set by e2fsck if empty */
315
316         /*
317          * The rest of the superblock fields should be zero, and if not it
318          * means they are likely already in use, so leave them alone.  We
319          * can leave it up to e2fsck to clean up any inconsistencies there.
320          */
321 }
322
323 /*
324  * Open the external journal device
325  */
326 static struct block_device *ext3_blkdev_get(dev_t dev)
327 {
328         struct block_device *bdev;
329         char b[BDEVNAME_SIZE];
330
331         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
332         if (IS_ERR(bdev))
333                 goto fail;
334         return bdev;
335
336 fail:
337         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
338                         __bdevname(dev, b), PTR_ERR(bdev));
339         return NULL;
340 }
341
342 /*
343  * Release the journal device
344  */
345 static int ext3_blkdev_put(struct block_device *bdev)
346 {
347         bd_release(bdev);
348         return blkdev_put(bdev);
349 }
350
351 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
352 {
353         struct block_device *bdev;
354         int ret = -ENODEV;
355
356         bdev = sbi->journal_bdev;
357         if (bdev) {
358                 ret = ext3_blkdev_put(bdev);
359                 sbi->journal_bdev = NULL;
360         }
361         return ret;
362 }
363
364 static inline struct inode *orphan_list_entry(struct list_head *l)
365 {
366         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
367 }
368
369 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
370 {
371         struct list_head *l;
372
373         printk(KERN_ERR "sb orphan head is %d\n",
374                le32_to_cpu(sbi->s_es->s_last_orphan));
375
376         printk(KERN_ERR "sb_info orphan list:\n");
377         list_for_each(l, &sbi->s_orphan) {
378                 struct inode *inode = orphan_list_entry(l);
379                 printk(KERN_ERR "  "
380                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
381                        inode->i_sb->s_id, inode->i_ino, inode,
382                        inode->i_mode, inode->i_nlink,
383                        NEXT_ORPHAN(inode));
384         }
385 }
386
387 static void ext3_put_super (struct super_block * sb)
388 {
389         struct ext3_sb_info *sbi = EXT3_SB(sb);
390         struct ext3_super_block *es = sbi->s_es;
391         int i;
392
393         ext3_xattr_put_super(sb);
394         journal_destroy(sbi->s_journal);
395         if (!(sb->s_flags & MS_RDONLY)) {
396                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
397                 es->s_state = cpu_to_le16(sbi->s_mount_state);
398                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
399                 mark_buffer_dirty(sbi->s_sbh);
400                 ext3_commit_super(sb, es, 1);
401         }
402
403         for (i = 0; i < sbi->s_gdb_count; i++)
404                 brelse(sbi->s_group_desc[i]);
405         kfree(sbi->s_group_desc);
406         percpu_counter_destroy(&sbi->s_freeblocks_counter);
407         percpu_counter_destroy(&sbi->s_freeinodes_counter);
408         percpu_counter_destroy(&sbi->s_dirs_counter);
409         brelse(sbi->s_sbh);
410 #ifdef CONFIG_QUOTA
411         for (i = 0; i < MAXQUOTAS; i++)
412                 kfree(sbi->s_qf_names[i]);
413 #endif
414
415         /* Debugging code just in case the in-memory inode orphan list
416          * isn't empty.  The on-disk one can be non-empty if we've
417          * detected an error and taken the fs readonly, but the
418          * in-memory list had better be clean by this point. */
419         if (!list_empty(&sbi->s_orphan))
420                 dump_orphan_list(sb, sbi);
421         J_ASSERT(list_empty(&sbi->s_orphan));
422
423         invalidate_bdev(sb->s_bdev, 0);
424         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
425                 /*
426                  * Invalidate the journal device's buffers.  We don't want them
427                  * floating about in memory - the physical journal device may
428                  * hotswapped, and it breaks the `ro-after' testing code.
429                  */
430                 sync_blockdev(sbi->journal_bdev);
431                 invalidate_bdev(sbi->journal_bdev, 0);
432                 ext3_blkdev_remove(sbi);
433         }
434         sb->s_fs_info = NULL;
435         kfree(sbi);
436         return;
437 }
438
439 static kmem_cache_t *ext3_inode_cachep;
440
441 /*
442  * Called inside transaction, so use GFP_NOFS
443  */
444 static struct inode *ext3_alloc_inode(struct super_block *sb)
445 {
446         struct ext3_inode_info *ei;
447
448         ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
449         if (!ei)
450                 return NULL;
451 #ifdef CONFIG_EXT3_FS_POSIX_ACL
452         ei->i_acl = EXT3_ACL_NOT_CACHED;
453         ei->i_default_acl = EXT3_ACL_NOT_CACHED;
454 #endif
455         ei->i_block_alloc_info = NULL;
456         ei->vfs_inode.i_version = 1;
457         return &ei->vfs_inode;
458 }
459
460 static void ext3_destroy_inode(struct inode *inode)
461 {
462         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
463 }
464
465 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
466 {
467         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
468
469         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
470             SLAB_CTOR_CONSTRUCTOR) {
471                 INIT_LIST_HEAD(&ei->i_orphan);
472 #ifdef CONFIG_EXT3_FS_XATTR
473                 init_rwsem(&ei->xattr_sem);
474 #endif
475                 mutex_init(&ei->truncate_mutex);
476                 inode_init_once(&ei->vfs_inode);
477         }
478 }
479
480 static int init_inodecache(void)
481 {
482         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
483                                              sizeof(struct ext3_inode_info),
484                                              0, (SLAB_RECLAIM_ACCOUNT|
485                                                 SLAB_MEM_SPREAD),
486                                              init_once, NULL);
487         if (ext3_inode_cachep == NULL)
488                 return -ENOMEM;
489         return 0;
490 }
491
492 static void destroy_inodecache(void)
493 {
494         if (kmem_cache_destroy(ext3_inode_cachep))
495                 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
496 }
497
498 static void ext3_clear_inode(struct inode *inode)
499 {
500         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
501 #ifdef CONFIG_EXT3_FS_POSIX_ACL
502         if (EXT3_I(inode)->i_acl &&
503                         EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
504                 posix_acl_release(EXT3_I(inode)->i_acl);
505                 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
506         }
507         if (EXT3_I(inode)->i_default_acl &&
508                         EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
509                 posix_acl_release(EXT3_I(inode)->i_default_acl);
510                 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
511         }
512 #endif
513         ext3_discard_reservation(inode);
514         EXT3_I(inode)->i_block_alloc_info = NULL;
515         if (unlikely(rsv))
516                 kfree(rsv);
517 }
518
519 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
520 {
521 #if defined(CONFIG_QUOTA)
522         struct ext3_sb_info *sbi = EXT3_SB(sb);
523
524         if (sbi->s_jquota_fmt)
525                 seq_printf(seq, ",jqfmt=%s",
526                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
527
528         if (sbi->s_qf_names[USRQUOTA])
529                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
530
531         if (sbi->s_qf_names[GRPQUOTA])
532                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
533
534         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
535                 seq_puts(seq, ",usrquota");
536
537         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
538                 seq_puts(seq, ",grpquota");
539 #endif
540 }
541
542 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
543 {
544         struct super_block *sb = vfs->mnt_sb;
545
546         if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
547                 seq_puts(seq, ",data=journal");
548         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
549                 seq_puts(seq, ",data=ordered");
550         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
551                 seq_puts(seq, ",data=writeback");
552
553         ext3_show_quota_options(seq, sb);
554
555         return 0;
556 }
557
558
559 static struct dentry *ext3_get_dentry(struct super_block *sb, void *vobjp)
560 {
561         __u32 *objp = vobjp;
562         unsigned long ino = objp[0];
563         __u32 generation = objp[1];
564         struct inode *inode;
565         struct dentry *result;
566
567         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
568                 return ERR_PTR(-ESTALE);
569         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
570                 return ERR_PTR(-ESTALE);
571
572         /* iget isn't really right if the inode is currently unallocated!!
573          *
574          * ext3_read_inode will return a bad_inode if the inode had been
575          * deleted, so we should be safe.
576          *
577          * Currently we don't know the generation for parent directory, so
578          * a generation of 0 means "accept any"
579          */
580         inode = iget(sb, ino);
581         if (inode == NULL)
582                 return ERR_PTR(-ENOMEM);
583         if (is_bad_inode(inode) ||
584             (generation && inode->i_generation != generation)) {
585                 iput(inode);
586                 return ERR_PTR(-ESTALE);
587         }
588         /* now to find a dentry.
589          * If possible, get a well-connected one
590          */
591         result = d_alloc_anon(inode);
592         if (!result) {
593                 iput(inode);
594                 return ERR_PTR(-ENOMEM);
595         }
596         return result;
597 }
598
599 #ifdef CONFIG_QUOTA
600 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
601 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
602
603 static int ext3_dquot_initialize(struct inode *inode, int type);
604 static int ext3_dquot_drop(struct inode *inode);
605 static int ext3_write_dquot(struct dquot *dquot);
606 static int ext3_acquire_dquot(struct dquot *dquot);
607 static int ext3_release_dquot(struct dquot *dquot);
608 static int ext3_mark_dquot_dirty(struct dquot *dquot);
609 static int ext3_write_info(struct super_block *sb, int type);
610 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
611 static int ext3_quota_on_mount(struct super_block *sb, int type);
612 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
613                                size_t len, loff_t off);
614 static ssize_t ext3_quota_write(struct super_block *sb, int type,
615                                 const char *data, size_t len, loff_t off);
616
617 static struct dquot_operations ext3_quota_operations = {
618         .initialize     = ext3_dquot_initialize,
619         .drop           = ext3_dquot_drop,
620         .alloc_space    = dquot_alloc_space,
621         .alloc_inode    = dquot_alloc_inode,
622         .free_space     = dquot_free_space,
623         .free_inode     = dquot_free_inode,
624         .transfer       = dquot_transfer,
625         .write_dquot    = ext3_write_dquot,
626         .acquire_dquot  = ext3_acquire_dquot,
627         .release_dquot  = ext3_release_dquot,
628         .mark_dirty     = ext3_mark_dquot_dirty,
629         .write_info     = ext3_write_info
630 };
631
632 static struct quotactl_ops ext3_qctl_operations = {
633         .quota_on       = ext3_quota_on,
634         .quota_off      = vfs_quota_off,
635         .quota_sync     = vfs_quota_sync,
636         .get_info       = vfs_get_dqinfo,
637         .set_info       = vfs_set_dqinfo,
638         .get_dqblk      = vfs_get_dqblk,
639         .set_dqblk      = vfs_set_dqblk
640 };
641 #endif
642
643 static struct super_operations ext3_sops = {
644         .alloc_inode    = ext3_alloc_inode,
645         .destroy_inode  = ext3_destroy_inode,
646         .read_inode     = ext3_read_inode,
647         .write_inode    = ext3_write_inode,
648         .dirty_inode    = ext3_dirty_inode,
649         .delete_inode   = ext3_delete_inode,
650         .put_super      = ext3_put_super,
651         .write_super    = ext3_write_super,
652         .sync_fs        = ext3_sync_fs,
653         .write_super_lockfs = ext3_write_super_lockfs,
654         .unlockfs       = ext3_unlockfs,
655         .statfs         = ext3_statfs,
656         .remount_fs     = ext3_remount,
657         .clear_inode    = ext3_clear_inode,
658         .show_options   = ext3_show_options,
659 #ifdef CONFIG_QUOTA
660         .quota_read     = ext3_quota_read,
661         .quota_write    = ext3_quota_write,
662 #endif
663 };
664
665 static struct export_operations ext3_export_ops = {
666         .get_parent = ext3_get_parent,
667         .get_dentry = ext3_get_dentry,
668 };
669
670 enum {
671         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
672         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
673         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
674         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
675         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
676         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
677         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
678         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
679         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
680         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
681         Opt_grpquota
682 };
683
684 static match_table_t tokens = {
685         {Opt_bsd_df, "bsddf"},
686         {Opt_minix_df, "minixdf"},
687         {Opt_grpid, "grpid"},
688         {Opt_grpid, "bsdgroups"},
689         {Opt_nogrpid, "nogrpid"},
690         {Opt_nogrpid, "sysvgroups"},
691         {Opt_resgid, "resgid=%u"},
692         {Opt_resuid, "resuid=%u"},
693         {Opt_sb, "sb=%u"},
694         {Opt_err_cont, "errors=continue"},
695         {Opt_err_panic, "errors=panic"},
696         {Opt_err_ro, "errors=remount-ro"},
697         {Opt_nouid32, "nouid32"},
698         {Opt_nocheck, "nocheck"},
699         {Opt_nocheck, "check=none"},
700         {Opt_debug, "debug"},
701         {Opt_oldalloc, "oldalloc"},
702         {Opt_orlov, "orlov"},
703         {Opt_user_xattr, "user_xattr"},
704         {Opt_nouser_xattr, "nouser_xattr"},
705         {Opt_acl, "acl"},
706         {Opt_noacl, "noacl"},
707         {Opt_reservation, "reservation"},
708         {Opt_noreservation, "noreservation"},
709         {Opt_noload, "noload"},
710         {Opt_nobh, "nobh"},
711         {Opt_bh, "bh"},
712         {Opt_commit, "commit=%u"},
713         {Opt_journal_update, "journal=update"},
714         {Opt_journal_inum, "journal=%u"},
715         {Opt_journal_dev, "journal_dev=%u"},
716         {Opt_abort, "abort"},
717         {Opt_data_journal, "data=journal"},
718         {Opt_data_ordered, "data=ordered"},
719         {Opt_data_writeback, "data=writeback"},
720         {Opt_offusrjquota, "usrjquota="},
721         {Opt_usrjquota, "usrjquota=%s"},
722         {Opt_offgrpjquota, "grpjquota="},
723         {Opt_grpjquota, "grpjquota=%s"},
724         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
725         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
726         {Opt_grpquota, "grpquota"},
727         {Opt_noquota, "noquota"},
728         {Opt_quota, "quota"},
729         {Opt_usrquota, "usrquota"},
730         {Opt_barrier, "barrier=%u"},
731         {Opt_err, NULL},
732         {Opt_resize, "resize"},
733 };
734
735 static ext3_fsblk_t get_sb_block(void **data)
736 {
737         ext3_fsblk_t    sb_block;
738         char            *options = (char *) *data;
739
740         if (!options || strncmp(options, "sb=", 3) != 0)
741                 return 1;       /* Default location */
742         options += 3;
743         /*todo: use simple_strtoll with >32bit ext3 */
744         sb_block = simple_strtoul(options, &options, 0);
745         if (*options && *options != ',') {
746                 printk("EXT3-fs: Invalid sb specification: %s\n",
747                        (char *) *data);
748                 return 1;
749         }
750         if (*options == ',')
751                 options++;
752         *data = (void *) options;
753         return sb_block;
754 }
755
756 static int parse_options (char *options, struct super_block *sb,
757                           unsigned int *inum, unsigned long *journal_devnum,
758                           ext3_fsblk_t *n_blocks_count, int is_remount)
759 {
760         struct ext3_sb_info *sbi = EXT3_SB(sb);
761         char * p;
762         substring_t args[MAX_OPT_ARGS];
763         int data_opt = 0;
764         int option;
765 #ifdef CONFIG_QUOTA
766         int qtype;
767         char *qname;
768 #endif
769
770         if (!options)
771                 return 1;
772
773         while ((p = strsep (&options, ",")) != NULL) {
774                 int token;
775                 if (!*p)
776                         continue;
777
778                 token = match_token(p, tokens, args);
779                 switch (token) {
780                 case Opt_bsd_df:
781                         clear_opt (sbi->s_mount_opt, MINIX_DF);
782                         break;
783                 case Opt_minix_df:
784                         set_opt (sbi->s_mount_opt, MINIX_DF);
785                         break;
786                 case Opt_grpid:
787                         set_opt (sbi->s_mount_opt, GRPID);
788                         break;
789                 case Opt_nogrpid:
790                         clear_opt (sbi->s_mount_opt, GRPID);
791                         break;
792                 case Opt_resuid:
793                         if (match_int(&args[0], &option))
794                                 return 0;
795                         sbi->s_resuid = option;
796                         break;
797                 case Opt_resgid:
798                         if (match_int(&args[0], &option))
799                                 return 0;
800                         sbi->s_resgid = option;
801                         break;
802                 case Opt_sb:
803                         /* handled by get_sb_block() instead of here */
804                         /* *sb_block = match_int(&args[0]); */
805                         break;
806                 case Opt_err_panic:
807                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
808                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
809                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
810                         break;
811                 case Opt_err_ro:
812                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
813                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
814                         set_opt (sbi->s_mount_opt, ERRORS_RO);
815                         break;
816                 case Opt_err_cont:
817                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
818                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
819                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
820                         break;
821                 case Opt_nouid32:
822                         set_opt (sbi->s_mount_opt, NO_UID32);
823                         break;
824                 case Opt_nocheck:
825                         clear_opt (sbi->s_mount_opt, CHECK);
826                         break;
827                 case Opt_debug:
828                         set_opt (sbi->s_mount_opt, DEBUG);
829                         break;
830                 case Opt_oldalloc:
831                         set_opt (sbi->s_mount_opt, OLDALLOC);
832                         break;
833                 case Opt_orlov:
834                         clear_opt (sbi->s_mount_opt, OLDALLOC);
835                         break;
836 #ifdef CONFIG_EXT3_FS_XATTR
837                 case Opt_user_xattr:
838                         set_opt (sbi->s_mount_opt, XATTR_USER);
839                         break;
840                 case Opt_nouser_xattr:
841                         clear_opt (sbi->s_mount_opt, XATTR_USER);
842                         break;
843 #else
844                 case Opt_user_xattr:
845                 case Opt_nouser_xattr:
846                         printk("EXT3 (no)user_xattr options not supported\n");
847                         break;
848 #endif
849 #ifdef CONFIG_EXT3_FS_POSIX_ACL
850                 case Opt_acl:
851                         set_opt(sbi->s_mount_opt, POSIX_ACL);
852                         break;
853                 case Opt_noacl:
854                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
855                         break;
856 #else
857                 case Opt_acl:
858                 case Opt_noacl:
859                         printk("EXT3 (no)acl options not supported\n");
860                         break;
861 #endif
862                 case Opt_reservation:
863                         set_opt(sbi->s_mount_opt, RESERVATION);
864                         break;
865                 case Opt_noreservation:
866                         clear_opt(sbi->s_mount_opt, RESERVATION);
867                         break;
868                 case Opt_journal_update:
869                         /* @@@ FIXME */
870                         /* Eventually we will want to be able to create
871                            a journal file here.  For now, only allow the
872                            user to specify an existing inode to be the
873                            journal file. */
874                         if (is_remount) {
875                                 printk(KERN_ERR "EXT3-fs: cannot specify "
876                                        "journal on remount\n");
877                                 return 0;
878                         }
879                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
880                         break;
881                 case Opt_journal_inum:
882                         if (is_remount) {
883                                 printk(KERN_ERR "EXT3-fs: cannot specify "
884                                        "journal on remount\n");
885                                 return 0;
886                         }
887                         if (match_int(&args[0], &option))
888                                 return 0;
889                         *inum = option;
890                         break;
891                 case Opt_journal_dev:
892                         if (is_remount) {
893                                 printk(KERN_ERR "EXT3-fs: cannot specify "
894                                        "journal on remount\n");
895                                 return 0;
896                         }
897                         if (match_int(&args[0], &option))
898                                 return 0;
899                         *journal_devnum = option;
900                         break;
901                 case Opt_noload:
902                         set_opt (sbi->s_mount_opt, NOLOAD);
903                         break;
904                 case Opt_commit:
905                         if (match_int(&args[0], &option))
906                                 return 0;
907                         if (option < 0)
908                                 return 0;
909                         if (option == 0)
910                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
911                         sbi->s_commit_interval = HZ * option;
912                         break;
913                 case Opt_data_journal:
914                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
915                         goto datacheck;
916                 case Opt_data_ordered:
917                         data_opt = EXT3_MOUNT_ORDERED_DATA;
918                         goto datacheck;
919                 case Opt_data_writeback:
920                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
921                 datacheck:
922                         if (is_remount) {
923                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
924                                                 != data_opt) {
925                                         printk(KERN_ERR
926                                                 "EXT3-fs: cannot change data "
927                                                 "mode on remount\n");
928                                         return 0;
929                                 }
930                         } else {
931                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
932                                 sbi->s_mount_opt |= data_opt;
933                         }
934                         break;
935 #ifdef CONFIG_QUOTA
936                 case Opt_usrjquota:
937                         qtype = USRQUOTA;
938                         goto set_qf_name;
939                 case Opt_grpjquota:
940                         qtype = GRPQUOTA;
941 set_qf_name:
942                         if (sb_any_quota_enabled(sb)) {
943                                 printk(KERN_ERR
944                                         "EXT3-fs: Cannot change journalled "
945                                         "quota options when quota turned on.\n");
946                                 return 0;
947                         }
948                         qname = match_strdup(&args[0]);
949                         if (!qname) {
950                                 printk(KERN_ERR
951                                         "EXT3-fs: not enough memory for "
952                                         "storing quotafile name.\n");
953                                 return 0;
954                         }
955                         if (sbi->s_qf_names[qtype] &&
956                             strcmp(sbi->s_qf_names[qtype], qname)) {
957                                 printk(KERN_ERR
958                                         "EXT3-fs: %s quota file already "
959                                         "specified.\n", QTYPE2NAME(qtype));
960                                 kfree(qname);
961                                 return 0;
962                         }
963                         sbi->s_qf_names[qtype] = qname;
964                         if (strchr(sbi->s_qf_names[qtype], '/')) {
965                                 printk(KERN_ERR
966                                         "EXT3-fs: quotafile must be on "
967                                         "filesystem root.\n");
968                                 kfree(sbi->s_qf_names[qtype]);
969                                 sbi->s_qf_names[qtype] = NULL;
970                                 return 0;
971                         }
972                         set_opt(sbi->s_mount_opt, QUOTA);
973                         break;
974                 case Opt_offusrjquota:
975                         qtype = USRQUOTA;
976                         goto clear_qf_name;
977                 case Opt_offgrpjquota:
978                         qtype = GRPQUOTA;
979 clear_qf_name:
980                         if (sb_any_quota_enabled(sb)) {
981                                 printk(KERN_ERR "EXT3-fs: Cannot change "
982                                         "journalled quota options when "
983                                         "quota turned on.\n");
984                                 return 0;
985                         }
986                         /*
987                          * The space will be released later when all options
988                          * are confirmed to be correct
989                          */
990                         sbi->s_qf_names[qtype] = NULL;
991                         break;
992                 case Opt_jqfmt_vfsold:
993                         sbi->s_jquota_fmt = QFMT_VFS_OLD;
994                         break;
995                 case Opt_jqfmt_vfsv0:
996                         sbi->s_jquota_fmt = QFMT_VFS_V0;
997                         break;
998                 case Opt_quota:
999                 case Opt_usrquota:
1000                         set_opt(sbi->s_mount_opt, QUOTA);
1001                         set_opt(sbi->s_mount_opt, USRQUOTA);
1002                         break;
1003                 case Opt_grpquota:
1004                         set_opt(sbi->s_mount_opt, QUOTA);
1005                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1006                         break;
1007                 case Opt_noquota:
1008                         if (sb_any_quota_enabled(sb)) {
1009                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1010                                         "options when quota turned on.\n");
1011                                 return 0;
1012                         }
1013                         clear_opt(sbi->s_mount_opt, QUOTA);
1014                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1015                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1016                         break;
1017 #else
1018                 case Opt_quota:
1019                 case Opt_usrquota:
1020                 case Opt_grpquota:
1021                 case Opt_usrjquota:
1022                 case Opt_grpjquota:
1023                 case Opt_offusrjquota:
1024                 case Opt_offgrpjquota:
1025                 case Opt_jqfmt_vfsold:
1026                 case Opt_jqfmt_vfsv0:
1027                         printk(KERN_ERR
1028                                 "EXT3-fs: journalled quota options not "
1029                                 "supported.\n");
1030                         break;
1031                 case Opt_noquota:
1032                         break;
1033 #endif
1034                 case Opt_abort:
1035                         set_opt(sbi->s_mount_opt, ABORT);
1036                         break;
1037                 case Opt_barrier:
1038                         if (match_int(&args[0], &option))
1039                                 return 0;
1040                         if (option)
1041                                 set_opt(sbi->s_mount_opt, BARRIER);
1042                         else
1043                                 clear_opt(sbi->s_mount_opt, BARRIER);
1044                         break;
1045                 case Opt_ignore:
1046                         break;
1047                 case Opt_resize:
1048                         if (!is_remount) {
1049                                 printk("EXT3-fs: resize option only available "
1050                                         "for remount\n");
1051                                 return 0;
1052                         }
1053                         if (match_int(&args[0], &option) != 0)
1054                                 return 0;
1055                         *n_blocks_count = option;
1056                         break;
1057                 case Opt_nobh:
1058                         set_opt(sbi->s_mount_opt, NOBH);
1059                         break;
1060                 case Opt_bh:
1061                         clear_opt(sbi->s_mount_opt, NOBH);
1062                         break;
1063                 default:
1064                         printk (KERN_ERR
1065                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1066                                 "or missing value\n", p);
1067                         return 0;
1068                 }
1069         }
1070 #ifdef CONFIG_QUOTA
1071         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1072                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1073                      sbi->s_qf_names[USRQUOTA])
1074                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1075
1076                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1077                      sbi->s_qf_names[GRPQUOTA])
1078                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1079
1080                 if ((sbi->s_qf_names[USRQUOTA] &&
1081                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1082                     (sbi->s_qf_names[GRPQUOTA] &&
1083                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1084                         printk(KERN_ERR "EXT3-fs: old and new quota "
1085                                         "format mixing.\n");
1086                         return 0;
1087                 }
1088
1089                 if (!sbi->s_jquota_fmt) {
1090                         printk(KERN_ERR "EXT3-fs: journalled quota format "
1091                                         "not specified.\n");
1092                         return 0;
1093                 }
1094         } else {
1095                 if (sbi->s_jquota_fmt) {
1096                         printk(KERN_ERR "EXT3-fs: journalled quota format "
1097                                         "specified with no journalling "
1098                                         "enabled.\n");
1099                         return 0;
1100                 }
1101         }
1102 #endif
1103         return 1;
1104 }
1105
1106 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1107                             int read_only)
1108 {
1109         struct ext3_sb_info *sbi = EXT3_SB(sb);
1110         int res = 0;
1111
1112         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1113                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1114                         "forcing read-only mode\n");
1115                 res = MS_RDONLY;
1116         }
1117         if (read_only)
1118                 return res;
1119         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1120                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1121                         "running e2fsck is recommended\n");
1122         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1123                 printk (KERN_WARNING
1124                         "EXT3-fs warning: mounting fs with errors, "
1125                         "running e2fsck is recommended\n");
1126         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1127                  le16_to_cpu(es->s_mnt_count) >=
1128                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1129                 printk (KERN_WARNING
1130                         "EXT3-fs warning: maximal mount count reached, "
1131                         "running e2fsck is recommended\n");
1132         else if (le32_to_cpu(es->s_checkinterval) &&
1133                 (le32_to_cpu(es->s_lastcheck) +
1134                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1135                 printk (KERN_WARNING
1136                         "EXT3-fs warning: checktime reached, "
1137                         "running e2fsck is recommended\n");
1138 #if 0
1139                 /* @@@ We _will_ want to clear the valid bit if we find
1140                    inconsistencies, to force a fsck at reboot.  But for
1141                    a plain journaled filesystem we can keep it set as
1142                    valid forever! :) */
1143         es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1144 #endif
1145         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1146                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1147         es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1148         es->s_mtime = cpu_to_le32(get_seconds());
1149         ext3_update_dynamic_rev(sb);
1150         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1151
1152         ext3_commit_super(sb, es, 1);
1153         if (test_opt(sb, DEBUG))
1154                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1155                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1156                         sb->s_blocksize,
1157                         sbi->s_groups_count,
1158                         EXT3_BLOCKS_PER_GROUP(sb),
1159                         EXT3_INODES_PER_GROUP(sb),
1160                         sbi->s_mount_opt);
1161
1162         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1163         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1164                 char b[BDEVNAME_SIZE];
1165
1166                 printk("external journal on %s\n",
1167                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1168         } else {
1169                 printk("internal journal\n");
1170         }
1171         return res;
1172 }
1173
1174 /* Called at mount-time, super-block is locked */
1175 static int ext3_check_descriptors (struct super_block * sb)
1176 {
1177         struct ext3_sb_info *sbi = EXT3_SB(sb);
1178         ext3_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1179         ext3_fsblk_t last_block;
1180         struct ext3_group_desc * gdp = NULL;
1181         int desc_block = 0;
1182         int i;
1183
1184         ext3_debug ("Checking group descriptors");
1185
1186         for (i = 0; i < sbi->s_groups_count; i++)
1187         {
1188                 if (i == sbi->s_groups_count - 1)
1189                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1190                 else
1191                         last_block = first_block +
1192                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1193
1194                 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1195                         gdp = (struct ext3_group_desc *)
1196                                         sbi->s_group_desc[desc_block++]->b_data;
1197                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1198                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1199                 {
1200                         ext3_error (sb, "ext3_check_descriptors",
1201                                     "Block bitmap for group %d"
1202                                     " not in group (block %lu)!",
1203                                     i, (unsigned long)
1204                                         le32_to_cpu(gdp->bg_block_bitmap));
1205                         return 0;
1206                 }
1207                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1208                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1209                 {
1210                         ext3_error (sb, "ext3_check_descriptors",
1211                                     "Inode bitmap for group %d"
1212                                     " not in group (block %lu)!",
1213                                     i, (unsigned long)
1214                                         le32_to_cpu(gdp->bg_inode_bitmap));
1215                         return 0;
1216                 }
1217                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1218                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >
1219                     last_block)
1220                 {
1221                         ext3_error (sb, "ext3_check_descriptors",
1222                                     "Inode table for group %d"
1223                                     " not in group (block %lu)!",
1224                                     i, (unsigned long)
1225                                         le32_to_cpu(gdp->bg_inode_table));
1226                         return 0;
1227                 }
1228                 first_block += EXT3_BLOCKS_PER_GROUP(sb);
1229                 gdp++;
1230         }
1231
1232         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1233         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1234         return 1;
1235 }
1236
1237
1238 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1239  * the superblock) which were deleted from all directories, but held open by
1240  * a process at the time of a crash.  We walk the list and try to delete these
1241  * inodes at recovery time (only with a read-write filesystem).
1242  *
1243  * In order to keep the orphan inode chain consistent during traversal (in
1244  * case of crash during recovery), we link each inode into the superblock
1245  * orphan list_head and handle it the same way as an inode deletion during
1246  * normal operation (which journals the operations for us).
1247  *
1248  * We only do an iget() and an iput() on each inode, which is very safe if we
1249  * accidentally point at an in-use or already deleted inode.  The worst that
1250  * can happen in this case is that we get a "bit already cleared" message from
1251  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1252  * e2fsck was run on this filesystem, and it must have already done the orphan
1253  * inode cleanup for us, so we can safely abort without any further action.
1254  */
1255 static void ext3_orphan_cleanup (struct super_block * sb,
1256                                  struct ext3_super_block * es)
1257 {
1258         unsigned int s_flags = sb->s_flags;
1259         int nr_orphans = 0, nr_truncates = 0;
1260 #ifdef CONFIG_QUOTA
1261         int i;
1262 #endif
1263         if (!es->s_last_orphan) {
1264                 jbd_debug(4, "no orphan inodes to clean up\n");
1265                 return;
1266         }
1267
1268         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1269                 if (es->s_last_orphan)
1270                         jbd_debug(1, "Errors on filesystem, "
1271                                   "clearing orphan list.\n");
1272                 es->s_last_orphan = 0;
1273                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1274                 return;
1275         }
1276
1277         if (s_flags & MS_RDONLY) {
1278                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1279                        sb->s_id);
1280                 sb->s_flags &= ~MS_RDONLY;
1281         }
1282 #ifdef CONFIG_QUOTA
1283         /* Needed for iput() to work correctly and not trash data */
1284         sb->s_flags |= MS_ACTIVE;
1285         /* Turn on quotas so that they are updated correctly */
1286         for (i = 0; i < MAXQUOTAS; i++) {
1287                 if (EXT3_SB(sb)->s_qf_names[i]) {
1288                         int ret = ext3_quota_on_mount(sb, i);
1289                         if (ret < 0)
1290                                 printk(KERN_ERR
1291                                         "EXT3-fs: Cannot turn on journalled "
1292                                         "quota: error %d\n", ret);
1293                 }
1294         }
1295 #endif
1296
1297         while (es->s_last_orphan) {
1298                 struct inode *inode;
1299
1300                 if (!(inode =
1301                       ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1302                         es->s_last_orphan = 0;
1303                         break;
1304                 }
1305
1306                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1307                 DQUOT_INIT(inode);
1308                 if (inode->i_nlink) {
1309                         printk(KERN_DEBUG
1310                                 "%s: truncating inode %lu to %Ld bytes\n",
1311                                 __FUNCTION__, inode->i_ino, inode->i_size);
1312                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1313                                   inode->i_ino, inode->i_size);
1314                         ext3_truncate(inode);
1315                         nr_truncates++;
1316                 } else {
1317                         printk(KERN_DEBUG
1318                                 "%s: deleting unreferenced inode %lu\n",
1319                                 __FUNCTION__, inode->i_ino);
1320                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1321                                   inode->i_ino);
1322                         nr_orphans++;
1323                 }
1324                 iput(inode);  /* The delete magic happens here! */
1325         }
1326
1327 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1328
1329         if (nr_orphans)
1330                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1331                        sb->s_id, PLURAL(nr_orphans));
1332         if (nr_truncates)
1333                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1334                        sb->s_id, PLURAL(nr_truncates));
1335 #ifdef CONFIG_QUOTA
1336         /* Turn quotas off */
1337         for (i = 0; i < MAXQUOTAS; i++) {
1338                 if (sb_dqopt(sb)->files[i])
1339                         vfs_quota_off(sb, i);
1340         }
1341 #endif
1342         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1343 }
1344
1345 #define log2(n) ffz(~(n))
1346
1347 /*
1348  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1349  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1350  * We need to be 1 filesystem block less than the 2^32 sector limit.
1351  */
1352 static loff_t ext3_max_size(int bits)
1353 {
1354         loff_t res = EXT3_NDIR_BLOCKS;
1355         /* This constant is calculated to be the largest file size for a
1356          * dense, 4k-blocksize file such that the total number of
1357          * sectors in the file, including data and all indirect blocks,
1358          * does not exceed 2^32. */
1359         const loff_t upper_limit = 0x1ff7fffd000LL;
1360
1361         res += 1LL << (bits-2);
1362         res += 1LL << (2*(bits-2));
1363         res += 1LL << (3*(bits-2));
1364         res <<= bits;
1365         if (res > upper_limit)
1366                 res = upper_limit;
1367         return res;
1368 }
1369
1370 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1371                                     ext3_fsblk_t logic_sb_block,
1372                                     int nr)
1373 {
1374         struct ext3_sb_info *sbi = EXT3_SB(sb);
1375         unsigned long bg, first_meta_bg;
1376         int has_super = 0;
1377
1378         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1379
1380         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1381             nr < first_meta_bg)
1382                 return (logic_sb_block + nr + 1);
1383         bg = sbi->s_desc_per_block * nr;
1384         if (ext3_bg_has_super(sb, bg))
1385                 has_super = 1;
1386         return (has_super + ext3_group_first_block_no(sb, bg));
1387 }
1388
1389
1390 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1391 {
1392         struct buffer_head * bh;
1393         struct ext3_super_block *es = NULL;
1394         struct ext3_sb_info *sbi;
1395         ext3_fsblk_t block;
1396         ext3_fsblk_t sb_block = get_sb_block(&data);
1397         ext3_fsblk_t logic_sb_block;
1398         unsigned long offset = 0;
1399         unsigned int journal_inum = 0;
1400         unsigned long journal_devnum = 0;
1401         unsigned long def_mount_opts;
1402         struct inode *root;
1403         int blocksize;
1404         int hblock;
1405         int db_count;
1406         int i;
1407         int needs_recovery;
1408         __le32 features;
1409
1410         sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1411         if (!sbi)
1412                 return -ENOMEM;
1413         sb->s_fs_info = sbi;
1414         memset(sbi, 0, sizeof(*sbi));
1415         sbi->s_mount_opt = 0;
1416         sbi->s_resuid = EXT3_DEF_RESUID;
1417         sbi->s_resgid = EXT3_DEF_RESGID;
1418
1419         unlock_kernel();
1420
1421         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1422         if (!blocksize) {
1423                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1424                 goto out_fail;
1425         }
1426
1427         /*
1428          * The ext3 superblock will not be buffer aligned for other than 1kB
1429          * block sizes.  We need to calculate the offset from buffer start.
1430          */
1431         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1432                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1433                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1434         } else {
1435                 logic_sb_block = sb_block;
1436         }
1437
1438         if (!(bh = sb_bread(sb, logic_sb_block))) {
1439                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1440                 goto out_fail;
1441         }
1442         /*
1443          * Note: s_es must be initialized as soon as possible because
1444          *       some ext3 macro-instructions depend on its value
1445          */
1446         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1447         sbi->s_es = es;
1448         sb->s_magic = le16_to_cpu(es->s_magic);
1449         if (sb->s_magic != EXT3_SUPER_MAGIC)
1450                 goto cantfind_ext3;
1451
1452         /* Set defaults before we parse the mount options */
1453         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1454         if (def_mount_opts & EXT3_DEFM_DEBUG)
1455                 set_opt(sbi->s_mount_opt, DEBUG);
1456         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1457                 set_opt(sbi->s_mount_opt, GRPID);
1458         if (def_mount_opts & EXT3_DEFM_UID16)
1459                 set_opt(sbi->s_mount_opt, NO_UID32);
1460         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1461                 set_opt(sbi->s_mount_opt, XATTR_USER);
1462         if (def_mount_opts & EXT3_DEFM_ACL)
1463                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1464         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1465                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1466         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1467                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1468         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1469                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1470
1471         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1472                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1473         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1474                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1475
1476         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1477         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1478
1479         set_opt(sbi->s_mount_opt, RESERVATION);
1480
1481         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1482                             NULL, 0))
1483                 goto failed_mount;
1484
1485         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1486                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1487
1488         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1489             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1490              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1491              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1492                 printk(KERN_WARNING
1493                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1494                        "running e2fsck is recommended\n");
1495         /*
1496          * Check feature flags regardless of the revision level, since we
1497          * previously didn't change the revision level when setting the flags,
1498          * so there is a chance incompat flags are set on a rev 0 filesystem.
1499          */
1500         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1501         if (features) {
1502                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1503                        "unsupported optional features (%x).\n",
1504                        sb->s_id, le32_to_cpu(features));
1505                 goto failed_mount;
1506         }
1507         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1508         if (!(sb->s_flags & MS_RDONLY) && features) {
1509                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1510                        "unsupported optional features (%x).\n",
1511                        sb->s_id, le32_to_cpu(features));
1512                 goto failed_mount;
1513         }
1514         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1515
1516         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1517             blocksize > EXT3_MAX_BLOCK_SIZE) {
1518                 printk(KERN_ERR
1519                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1520                        blocksize, sb->s_id);
1521                 goto failed_mount;
1522         }
1523
1524         hblock = bdev_hardsect_size(sb->s_bdev);
1525         if (sb->s_blocksize != blocksize) {
1526                 /*
1527                  * Make sure the blocksize for the filesystem is larger
1528                  * than the hardware sectorsize for the machine.
1529                  */
1530                 if (blocksize < hblock) {
1531                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1532                                "device blocksize %d.\n", blocksize, hblock);
1533                         goto failed_mount;
1534                 }
1535
1536                 brelse (bh);
1537                 sb_set_blocksize(sb, blocksize);
1538                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1539                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1540                 bh = sb_bread(sb, logic_sb_block);
1541                 if (!bh) {
1542                         printk(KERN_ERR
1543                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1544                         goto failed_mount;
1545                 }
1546                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1547                 sbi->s_es = es;
1548                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1549                         printk (KERN_ERR
1550                                 "EXT3-fs: Magic mismatch, very weird !\n");
1551                         goto failed_mount;
1552                 }
1553         }
1554
1555         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1556
1557         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1558                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1559                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1560         } else {
1561                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1562                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1563                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1564                     (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1565                     (sbi->s_inode_size > blocksize)) {
1566                         printk (KERN_ERR
1567                                 "EXT3-fs: unsupported inode size: %d\n",
1568                                 sbi->s_inode_size);
1569                         goto failed_mount;
1570                 }
1571         }
1572         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1573                                    le32_to_cpu(es->s_log_frag_size);
1574         if (blocksize != sbi->s_frag_size) {
1575                 printk(KERN_ERR
1576                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1577                        sbi->s_frag_size, blocksize);
1578                 goto failed_mount;
1579         }
1580         sbi->s_frags_per_block = 1;
1581         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1582         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1583         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1584         if (EXT3_INODE_SIZE(sb) == 0)
1585                 goto cantfind_ext3;
1586         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1587         if (sbi->s_inodes_per_block == 0)
1588                 goto cantfind_ext3;
1589         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1590                                         sbi->s_inodes_per_block;
1591         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1592         sbi->s_sbh = bh;
1593         sbi->s_mount_state = le16_to_cpu(es->s_state);
1594         sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1595         sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1596         for (i=0; i < 4; i++)
1597                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1598         sbi->s_def_hash_version = es->s_def_hash_version;
1599
1600         if (sbi->s_blocks_per_group > blocksize * 8) {
1601                 printk (KERN_ERR
1602                         "EXT3-fs: #blocks per group too big: %lu\n",
1603                         sbi->s_blocks_per_group);
1604                 goto failed_mount;
1605         }
1606         if (sbi->s_frags_per_group > blocksize * 8) {
1607                 printk (KERN_ERR
1608                         "EXT3-fs: #fragments per group too big: %lu\n",
1609                         sbi->s_frags_per_group);
1610                 goto failed_mount;
1611         }
1612         if (sbi->s_inodes_per_group > blocksize * 8) {
1613                 printk (KERN_ERR
1614                         "EXT3-fs: #inodes per group too big: %lu\n",
1615                         sbi->s_inodes_per_group);
1616                 goto failed_mount;
1617         }
1618
1619         if (le32_to_cpu(es->s_blocks_count) >
1620                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1621                 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1622                         " too large to mount safely\n", sb->s_id);
1623                 if (sizeof(sector_t) < 8)
1624                         printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1625                                         "enabled\n");
1626                 goto failed_mount;
1627         }
1628
1629         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1630                 goto cantfind_ext3;
1631         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1632                                le32_to_cpu(es->s_first_data_block) - 1)
1633                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1634         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1635                    EXT3_DESC_PER_BLOCK(sb);
1636         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1637                                     GFP_KERNEL);
1638         if (sbi->s_group_desc == NULL) {
1639                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1640                 goto failed_mount;
1641         }
1642
1643         bgl_lock_init(&sbi->s_blockgroup_lock);
1644
1645         for (i = 0; i < db_count; i++) {
1646                 block = descriptor_loc(sb, logic_sb_block, i);
1647                 sbi->s_group_desc[i] = sb_bread(sb, block);
1648                 if (!sbi->s_group_desc[i]) {
1649                         printk (KERN_ERR "EXT3-fs: "
1650                                 "can't read group descriptor %d\n", i);
1651                         db_count = i;
1652                         goto failed_mount2;
1653                 }
1654         }
1655         if (!ext3_check_descriptors (sb)) {
1656                 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1657                 goto failed_mount2;
1658         }
1659         sbi->s_gdb_count = db_count;
1660         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1661         spin_lock_init(&sbi->s_next_gen_lock);
1662
1663         percpu_counter_init(&sbi->s_freeblocks_counter,
1664                 ext3_count_free_blocks(sb));
1665         percpu_counter_init(&sbi->s_freeinodes_counter,
1666                 ext3_count_free_inodes(sb));
1667         percpu_counter_init(&sbi->s_dirs_counter,
1668                 ext3_count_dirs(sb));
1669
1670         /* per fileystem reservation list head & lock */
1671         spin_lock_init(&sbi->s_rsv_window_lock);
1672         sbi->s_rsv_window_root = RB_ROOT;
1673         /* Add a single, static dummy reservation to the start of the
1674          * reservation window list --- it gives us a placeholder for
1675          * append-at-start-of-list which makes the allocation logic
1676          * _much_ simpler. */
1677         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1678         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1679         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1680         sbi->s_rsv_window_head.rsv_goal_size = 0;
1681         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1682
1683         /*
1684          * set up enough so that it can read an inode
1685          */
1686         sb->s_op = &ext3_sops;
1687         sb->s_export_op = &ext3_export_ops;
1688         sb->s_xattr = ext3_xattr_handlers;
1689 #ifdef CONFIG_QUOTA
1690         sb->s_qcop = &ext3_qctl_operations;
1691         sb->dq_op = &ext3_quota_operations;
1692 #endif
1693         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1694
1695         sb->s_root = NULL;
1696
1697         needs_recovery = (es->s_last_orphan != 0 ||
1698                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1699                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1700
1701         /*
1702          * The first inode we look at is the journal inode.  Don't try
1703          * root first: it may be modified in the journal!
1704          */
1705         if (!test_opt(sb, NOLOAD) &&
1706             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1707                 if (ext3_load_journal(sb, es, journal_devnum))
1708                         goto failed_mount3;
1709         } else if (journal_inum) {
1710                 if (ext3_create_journal(sb, es, journal_inum))
1711                         goto failed_mount3;
1712         } else {
1713                 if (!silent)
1714                         printk (KERN_ERR
1715                                 "ext3: No journal on filesystem on %s\n",
1716                                 sb->s_id);
1717                 goto failed_mount3;
1718         }
1719
1720         /* We have now updated the journal if required, so we can
1721          * validate the data journaling mode. */
1722         switch (test_opt(sb, DATA_FLAGS)) {
1723         case 0:
1724                 /* No mode set, assume a default based on the journal
1725                    capabilities: ORDERED_DATA if the journal can
1726                    cope, else JOURNAL_DATA */
1727                 if (journal_check_available_features
1728                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1729                         set_opt(sbi->s_mount_opt, ORDERED_DATA);
1730                 else
1731                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1732                 break;
1733
1734         case EXT3_MOUNT_ORDERED_DATA:
1735         case EXT3_MOUNT_WRITEBACK_DATA:
1736                 if (!journal_check_available_features
1737                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1738                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1739                                "requested data journaling mode\n");
1740                         goto failed_mount4;
1741                 }
1742         default:
1743                 break;
1744         }
1745
1746         if (test_opt(sb, NOBH)) {
1747                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1748                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1749                                 "its supported only with writeback mode\n");
1750                         clear_opt(sbi->s_mount_opt, NOBH);
1751                 }
1752         }
1753         /*
1754          * The journal_load will have done any necessary log recovery,
1755          * so we can safely mount the rest of the filesystem now.
1756          */
1757
1758         root = iget(sb, EXT3_ROOT_INO);
1759         sb->s_root = d_alloc_root(root);
1760         if (!sb->s_root) {
1761                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1762                 iput(root);
1763                 goto failed_mount4;
1764         }
1765         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1766                 dput(sb->s_root);
1767                 sb->s_root = NULL;
1768                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1769                 goto failed_mount4;
1770         }
1771
1772         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1773         /*
1774          * akpm: core read_super() calls in here with the superblock locked.
1775          * That deadlocks, because orphan cleanup needs to lock the superblock
1776          * in numerous places.  Here we just pop the lock - it's relatively
1777          * harmless, because we are now ready to accept write_super() requests,
1778          * and aviro says that's the only reason for hanging onto the
1779          * superblock lock.
1780          */
1781         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1782         ext3_orphan_cleanup(sb, es);
1783         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1784         if (needs_recovery)
1785                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1786         ext3_mark_recovery_complete(sb, es);
1787         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1788                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1789                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1790                 "writeback");
1791
1792         lock_kernel();
1793         return 0;
1794
1795 cantfind_ext3:
1796         if (!silent)
1797                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1798                        sb->s_id);
1799         goto failed_mount;
1800
1801 failed_mount4:
1802         journal_destroy(sbi->s_journal);
1803 failed_mount3:
1804         percpu_counter_destroy(&sbi->s_freeblocks_counter);
1805         percpu_counter_destroy(&sbi->s_freeinodes_counter);
1806         percpu_counter_destroy(&sbi->s_dirs_counter);
1807 failed_mount2:
1808         for (i = 0; i < db_count; i++)
1809                 brelse(sbi->s_group_desc[i]);
1810         kfree(sbi->s_group_desc);
1811 failed_mount:
1812 #ifdef CONFIG_QUOTA
1813         for (i = 0; i < MAXQUOTAS; i++)
1814                 kfree(sbi->s_qf_names[i]);
1815 #endif
1816         ext3_blkdev_remove(sbi);
1817         brelse(bh);
1818 out_fail:
1819         sb->s_fs_info = NULL;
1820         kfree(sbi);
1821         lock_kernel();
1822         return -EINVAL;
1823 }
1824
1825 /*
1826  * Setup any per-fs journal parameters now.  We'll do this both on
1827  * initial mount, once the journal has been initialised but before we've
1828  * done any recovery; and again on any subsequent remount.
1829  */
1830 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1831 {
1832         struct ext3_sb_info *sbi = EXT3_SB(sb);
1833
1834         if (sbi->s_commit_interval)
1835                 journal->j_commit_interval = sbi->s_commit_interval;
1836         /* We could also set up an ext3-specific default for the commit
1837          * interval here, but for now we'll just fall back to the jbd
1838          * default. */
1839
1840         spin_lock(&journal->j_state_lock);
1841         if (test_opt(sb, BARRIER))
1842                 journal->j_flags |= JFS_BARRIER;
1843         else
1844                 journal->j_flags &= ~JFS_BARRIER;
1845         spin_unlock(&journal->j_state_lock);
1846 }
1847
1848 static journal_t *ext3_get_journal(struct super_block *sb,
1849                                    unsigned int journal_inum)
1850 {
1851         struct inode *journal_inode;
1852         journal_t *journal;
1853
1854         /* First, test for the existence of a valid inode on disk.  Bad
1855          * things happen if we iget() an unused inode, as the subsequent
1856          * iput() will try to delete it. */
1857
1858         journal_inode = iget(sb, journal_inum);
1859         if (!journal_inode) {
1860                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1861                 return NULL;
1862         }
1863         if (!journal_inode->i_nlink) {
1864                 make_bad_inode(journal_inode);
1865                 iput(journal_inode);
1866                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1867                 return NULL;
1868         }
1869
1870         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1871                   journal_inode, journal_inode->i_size);
1872         if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1873                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1874                 iput(journal_inode);
1875                 return NULL;
1876         }
1877
1878         journal = journal_init_inode(journal_inode);
1879         if (!journal) {
1880                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1881                 iput(journal_inode);
1882                 return NULL;
1883         }
1884         journal->j_private = sb;
1885         ext3_init_journal_params(sb, journal);
1886         return journal;
1887 }
1888
1889 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1890                                        dev_t j_dev)
1891 {
1892         struct buffer_head * bh;
1893         journal_t *journal;
1894         ext3_fsblk_t start;
1895         ext3_fsblk_t len;
1896         int hblock, blocksize;
1897         ext3_fsblk_t sb_block;
1898         unsigned long offset;
1899         struct ext3_super_block * es;
1900         struct block_device *bdev;
1901
1902         bdev = ext3_blkdev_get(j_dev);
1903         if (bdev == NULL)
1904                 return NULL;
1905
1906         if (bd_claim(bdev, sb)) {
1907                 printk(KERN_ERR
1908                         "EXT3: failed to claim external journal device.\n");
1909                 blkdev_put(bdev);
1910                 return NULL;
1911         }
1912
1913         blocksize = sb->s_blocksize;
1914         hblock = bdev_hardsect_size(bdev);
1915         if (blocksize < hblock) {
1916                 printk(KERN_ERR
1917                         "EXT3-fs: blocksize too small for journal device.\n");
1918                 goto out_bdev;
1919         }
1920
1921         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1922         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1923         set_blocksize(bdev, blocksize);
1924         if (!(bh = __bread(bdev, sb_block, blocksize))) {
1925                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1926                        "external journal\n");
1927                 goto out_bdev;
1928         }
1929
1930         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1931         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1932             !(le32_to_cpu(es->s_feature_incompat) &
1933               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1934                 printk(KERN_ERR "EXT3-fs: external journal has "
1935                                         "bad superblock\n");
1936                 brelse(bh);
1937                 goto out_bdev;
1938         }
1939
1940         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1941                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1942                 brelse(bh);
1943                 goto out_bdev;
1944         }
1945
1946         len = le32_to_cpu(es->s_blocks_count);
1947         start = sb_block + 1;
1948         brelse(bh);     /* we're done with the superblock */
1949
1950         journal = journal_init_dev(bdev, sb->s_bdev,
1951                                         start, len, blocksize);
1952         if (!journal) {
1953                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1954                 goto out_bdev;
1955         }
1956         journal->j_private = sb;
1957         ll_rw_block(READ, 1, &journal->j_sb_buffer);
1958         wait_on_buffer(journal->j_sb_buffer);
1959         if (!buffer_uptodate(journal->j_sb_buffer)) {
1960                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1961                 goto out_journal;
1962         }
1963         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1964                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1965                                         "user (unsupported) - %d\n",
1966                         be32_to_cpu(journal->j_superblock->s_nr_users));
1967                 goto out_journal;
1968         }
1969         EXT3_SB(sb)->journal_bdev = bdev;
1970         ext3_init_journal_params(sb, journal);
1971         return journal;
1972 out_journal:
1973         journal_destroy(journal);
1974 out_bdev:
1975         ext3_blkdev_put(bdev);
1976         return NULL;
1977 }
1978
1979 static int ext3_load_journal(struct super_block *sb,
1980                              struct ext3_super_block *es,
1981                              unsigned long journal_devnum)
1982 {
1983         journal_t *journal;
1984         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
1985         dev_t journal_dev;
1986         int err = 0;
1987         int really_read_only;
1988
1989         if (journal_devnum &&
1990             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1991                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
1992                         "numbers have changed\n");
1993                 journal_dev = new_decode_dev(journal_devnum);
1994         } else
1995                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1996
1997         really_read_only = bdev_read_only(sb->s_bdev);
1998
1999         /*
2000          * Are we loading a blank journal or performing recovery after a
2001          * crash?  For recovery, we need to check in advance whether we
2002          * can get read-write access to the device.
2003          */
2004
2005         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2006                 if (sb->s_flags & MS_RDONLY) {
2007                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
2008                                         "required on readonly filesystem.\n");
2009                         if (really_read_only) {
2010                                 printk(KERN_ERR "EXT3-fs: write access "
2011                                         "unavailable, cannot proceed.\n");
2012                                 return -EROFS;
2013                         }
2014                         printk (KERN_INFO "EXT3-fs: write access will "
2015                                         "be enabled during recovery.\n");
2016                 }
2017         }
2018
2019         if (journal_inum && journal_dev) {
2020                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2021                        "and inode journals!\n");
2022                 return -EINVAL;
2023         }
2024
2025         if (journal_inum) {
2026                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2027                         return -EINVAL;
2028         } else {
2029                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2030                         return -EINVAL;
2031         }
2032
2033         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2034                 err = journal_update_format(journal);
2035                 if (err)  {
2036                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2037                         journal_destroy(journal);
2038                         return err;
2039                 }
2040         }
2041
2042         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2043                 err = journal_wipe(journal, !really_read_only);
2044         if (!err)
2045                 err = journal_load(journal);
2046
2047         if (err) {
2048                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2049                 journal_destroy(journal);
2050                 return err;
2051         }
2052
2053         EXT3_SB(sb)->s_journal = journal;
2054         ext3_clear_journal_err(sb, es);
2055
2056         if (journal_devnum &&
2057             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2058                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2059                 sb->s_dirt = 1;
2060
2061                 /* Make sure we flush the recovery flag to disk. */
2062                 ext3_commit_super(sb, es, 1);
2063         }
2064
2065         return 0;
2066 }
2067
2068 static int ext3_create_journal(struct super_block * sb,
2069                                struct ext3_super_block * es,
2070                                unsigned int journal_inum)
2071 {
2072         journal_t *journal;
2073
2074         if (sb->s_flags & MS_RDONLY) {
2075                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2076                                 "create journal.\n");
2077                 return -EROFS;
2078         }
2079
2080         if (!(journal = ext3_get_journal(sb, journal_inum)))
2081                 return -EINVAL;
2082
2083         printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2084                journal_inum);
2085
2086         if (journal_create(journal)) {
2087                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2088                 journal_destroy(journal);
2089                 return -EIO;
2090         }
2091
2092         EXT3_SB(sb)->s_journal = journal;
2093
2094         ext3_update_dynamic_rev(sb);
2095         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2096         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2097
2098         es->s_journal_inum = cpu_to_le32(journal_inum);
2099         sb->s_dirt = 1;
2100
2101         /* Make sure we flush the recovery flag to disk. */
2102         ext3_commit_super(sb, es, 1);
2103
2104         return 0;
2105 }
2106
2107 static void ext3_commit_super (struct super_block * sb,
2108                                struct ext3_super_block * es,
2109                                int sync)
2110 {
2111         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2112
2113         if (!sbh)
2114                 return;
2115         es->s_wtime = cpu_to_le32(get_seconds());
2116         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2117         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2118         BUFFER_TRACE(sbh, "marking dirty");
2119         mark_buffer_dirty(sbh);
2120         if (sync)
2121                 sync_dirty_buffer(sbh);
2122 }
2123
2124
2125 /*
2126  * Have we just finished recovery?  If so, and if we are mounting (or
2127  * remounting) the filesystem readonly, then we will end up with a
2128  * consistent fs on disk.  Record that fact.
2129  */
2130 static void ext3_mark_recovery_complete(struct super_block * sb,
2131                                         struct ext3_super_block * es)
2132 {
2133         journal_t *journal = EXT3_SB(sb)->s_journal;
2134
2135         journal_lock_updates(journal);
2136         journal_flush(journal);
2137         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2138             sb->s_flags & MS_RDONLY) {
2139                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2140                 sb->s_dirt = 0;
2141                 ext3_commit_super(sb, es, 1);
2142         }
2143         journal_unlock_updates(journal);
2144 }
2145
2146 /*
2147  * If we are mounting (or read-write remounting) a filesystem whose journal
2148  * has recorded an error from a previous lifetime, move that error to the
2149  * main filesystem now.
2150  */
2151 static void ext3_clear_journal_err(struct super_block * sb,
2152                                    struct ext3_super_block * es)
2153 {
2154         journal_t *journal;
2155         int j_errno;
2156         const char *errstr;
2157
2158         journal = EXT3_SB(sb)->s_journal;
2159
2160         /*
2161          * Now check for any error status which may have been recorded in the
2162          * journal by a prior ext3_error() or ext3_abort()
2163          */
2164
2165         j_errno = journal_errno(journal);
2166         if (j_errno) {
2167                 char nbuf[16];
2168
2169                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2170                 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2171                              "from previous mount: %s", errstr);
2172                 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2173                              "filesystem check.");
2174
2175                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2176                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2177                 ext3_commit_super (sb, es, 1);
2178
2179                 journal_clear_err(journal);
2180         }
2181 }
2182
2183 /*
2184  * Force the running and committing transactions to commit,
2185  * and wait on the commit.
2186  */
2187 int ext3_force_commit(struct super_block *sb)
2188 {
2189         journal_t *journal;
2190         int ret;
2191
2192         if (sb->s_flags & MS_RDONLY)
2193                 return 0;
2194
2195         journal = EXT3_SB(sb)->s_journal;
2196         sb->s_dirt = 0;
2197         ret = ext3_journal_force_commit(journal);
2198         return ret;
2199 }
2200
2201 /*
2202  * Ext3 always journals updates to the superblock itself, so we don't
2203  * have to propagate any other updates to the superblock on disk at this
2204  * point.  Just start an async writeback to get the buffers on their way
2205  * to the disk.
2206  *
2207  * This implicitly triggers the writebehind on sync().
2208  */
2209
2210 static void ext3_write_super (struct super_block * sb)
2211 {
2212         if (mutex_trylock(&sb->s_lock) != 0)
2213                 BUG();
2214         sb->s_dirt = 0;
2215 }
2216
2217 static int ext3_sync_fs(struct super_block *sb, int wait)
2218 {
2219         tid_t target;
2220
2221         sb->s_dirt = 0;
2222         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2223                 if (wait)
2224                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2225         }
2226         return 0;
2227 }
2228
2229 /*
2230  * LVM calls this function before a (read-only) snapshot is created.  This
2231  * gives us a chance to flush the journal completely and mark the fs clean.
2232  */
2233 static void ext3_write_super_lockfs(struct super_block *sb)
2234 {
2235         sb->s_dirt = 0;
2236
2237         if (!(sb->s_flags & MS_RDONLY)) {
2238                 journal_t *journal = EXT3_SB(sb)->s_journal;
2239
2240                 /* Now we set up the journal barrier. */
2241                 journal_lock_updates(journal);
2242                 journal_flush(journal);
2243
2244                 /* Journal blocked and flushed, clear needs_recovery flag. */
2245                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2246                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2247         }
2248 }
2249
2250 /*
2251  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2252  * flag here, even though the filesystem is not technically dirty yet.
2253  */
2254 static void ext3_unlockfs(struct super_block *sb)
2255 {
2256         if (!(sb->s_flags & MS_RDONLY)) {
2257                 lock_super(sb);
2258                 /* Reser the needs_recovery flag before the fs is unlocked. */
2259                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2260                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2261                 unlock_super(sb);
2262                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2263         }
2264 }
2265
2266 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2267 {
2268         struct ext3_super_block * es;
2269         struct ext3_sb_info *sbi = EXT3_SB(sb);
2270         ext3_fsblk_t n_blocks_count = 0;
2271         unsigned long old_sb_flags;
2272         struct ext3_mount_options old_opts;
2273         int err;
2274 #ifdef CONFIG_QUOTA
2275         int i;
2276 #endif
2277
2278         /* Store the original options */
2279         old_sb_flags = sb->s_flags;
2280         old_opts.s_mount_opt = sbi->s_mount_opt;
2281         old_opts.s_resuid = sbi->s_resuid;
2282         old_opts.s_resgid = sbi->s_resgid;
2283         old_opts.s_commit_interval = sbi->s_commit_interval;
2284 #ifdef CONFIG_QUOTA
2285         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2286         for (i = 0; i < MAXQUOTAS; i++)
2287                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2288 #endif
2289
2290         /*
2291          * Allow the "check" option to be passed as a remount option.
2292          */
2293         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2294                 err = -EINVAL;
2295                 goto restore_opts;
2296         }
2297
2298         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2299                 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2300
2301         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2302                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2303
2304         es = sbi->s_es;
2305
2306         ext3_init_journal_params(sb, sbi->s_journal);
2307
2308         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2309                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2310                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2311                         err = -EROFS;
2312                         goto restore_opts;
2313                 }
2314
2315                 if (*flags & MS_RDONLY) {
2316                         /*
2317                          * First of all, the unconditional stuff we have to do
2318                          * to disable replay of the journal when we next remount
2319                          */
2320                         sb->s_flags |= MS_RDONLY;
2321
2322                         /*
2323                          * OK, test if we are remounting a valid rw partition
2324                          * readonly, and if so set the rdonly flag and then
2325                          * mark the partition as valid again.
2326                          */
2327                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2328                             (sbi->s_mount_state & EXT3_VALID_FS))
2329                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2330
2331                         ext3_mark_recovery_complete(sb, es);
2332                 } else {
2333                         __le32 ret;
2334                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2335                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2336                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2337                                        "remount RDWR because of unsupported "
2338                                        "optional features (%x).\n",
2339                                        sb->s_id, le32_to_cpu(ret));
2340                                 err = -EROFS;
2341                                 goto restore_opts;
2342                         }
2343                         /*
2344                          * Mounting a RDONLY partition read-write, so reread
2345                          * and store the current valid flag.  (It may have
2346                          * been changed by e2fsck since we originally mounted
2347                          * the partition.)
2348                          */
2349                         ext3_clear_journal_err(sb, es);
2350                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2351                         if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2352                                 err = ret;
2353                                 goto restore_opts;
2354                         }
2355                         if (!ext3_setup_super (sb, es, 0))
2356                                 sb->s_flags &= ~MS_RDONLY;
2357                 }
2358         }
2359 #ifdef CONFIG_QUOTA
2360         /* Release old quota file names */
2361         for (i = 0; i < MAXQUOTAS; i++)
2362                 if (old_opts.s_qf_names[i] &&
2363                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2364                         kfree(old_opts.s_qf_names[i]);
2365 #endif
2366         return 0;
2367 restore_opts:
2368         sb->s_flags = old_sb_flags;
2369         sbi->s_mount_opt = old_opts.s_mount_opt;
2370         sbi->s_resuid = old_opts.s_resuid;
2371         sbi->s_resgid = old_opts.s_resgid;
2372         sbi->s_commit_interval = old_opts.s_commit_interval;
2373 #ifdef CONFIG_QUOTA
2374         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2375         for (i = 0; i < MAXQUOTAS; i++) {
2376                 if (sbi->s_qf_names[i] &&
2377                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2378                         kfree(sbi->s_qf_names[i]);
2379                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2380         }
2381 #endif
2382         return err;
2383 }
2384
2385 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2386 {
2387         struct super_block *sb = dentry->d_sb;
2388         struct ext3_sb_info *sbi = EXT3_SB(sb);
2389         struct ext3_super_block *es = sbi->s_es;
2390         ext3_fsblk_t overhead;
2391         int i;
2392
2393         if (test_opt (sb, MINIX_DF))
2394                 overhead = 0;
2395         else {
2396                 unsigned long ngroups;
2397                 ngroups = EXT3_SB(sb)->s_groups_count;
2398                 smp_rmb();
2399
2400                 /*
2401                  * Compute the overhead (FS structures)
2402                  */
2403
2404                 /*
2405                  * All of the blocks before first_data_block are
2406                  * overhead
2407                  */
2408                 overhead = le32_to_cpu(es->s_first_data_block);
2409
2410                 /*
2411                  * Add the overhead attributed to the superblock and
2412                  * block group descriptors.  If the sparse superblocks
2413                  * feature is turned on, then not all groups have this.
2414                  */
2415                 for (i = 0; i < ngroups; i++) {
2416                         overhead += ext3_bg_has_super(sb, i) +
2417                                 ext3_bg_num_gdb(sb, i);
2418                         cond_resched();
2419                 }
2420
2421                 /*
2422                  * Every block group has an inode bitmap, a block
2423                  * bitmap, and an inode table.
2424                  */
2425                 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2426         }
2427
2428         buf->f_type = EXT3_SUPER_MAGIC;
2429         buf->f_bsize = sb->s_blocksize;
2430         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2431         buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
2432         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2433         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2434                 buf->f_bavail = 0;
2435         buf->f_files = le32_to_cpu(es->s_inodes_count);
2436         buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
2437         buf->f_namelen = EXT3_NAME_LEN;
2438         return 0;
2439 }
2440
2441 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2442  * is locked for write. Otherwise the are possible deadlocks:
2443  * Process 1                         Process 2
2444  * ext3_create()                     quota_sync()
2445  *   journal_start()                   write_dquot()
2446  *   DQUOT_INIT()                        down(dqio_mutex)
2447  *     down(dqio_mutex)                    journal_start()
2448  *
2449  */
2450
2451 #ifdef CONFIG_QUOTA
2452
2453 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2454 {
2455         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2456 }
2457
2458 static int ext3_dquot_initialize(struct inode *inode, int type)
2459 {
2460         handle_t *handle;
2461         int ret, err;
2462
2463         /* We may create quota structure so we need to reserve enough blocks */
2464         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2465         if (IS_ERR(handle))
2466                 return PTR_ERR(handle);
2467         ret = dquot_initialize(inode, type);
2468         err = ext3_journal_stop(handle);
2469         if (!ret)
2470                 ret = err;
2471         return ret;
2472 }
2473
2474 static int ext3_dquot_drop(struct inode *inode)
2475 {
2476         handle_t *handle;
2477         int ret, err;
2478
2479         /* We may delete quota structure so we need to reserve enough blocks */
2480         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2481         if (IS_ERR(handle))
2482                 return PTR_ERR(handle);
2483         ret = dquot_drop(inode);
2484         err = ext3_journal_stop(handle);
2485         if (!ret)
2486                 ret = err;
2487         return ret;
2488 }
2489
2490 static int ext3_write_dquot(struct dquot *dquot)
2491 {
2492         int ret, err;
2493         handle_t *handle;
2494         struct inode *inode;
2495
2496         inode = dquot_to_inode(dquot);
2497         handle = ext3_journal_start(inode,
2498                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2499         if (IS_ERR(handle))
2500                 return PTR_ERR(handle);
2501         ret = dquot_commit(dquot);
2502         err = ext3_journal_stop(handle);
2503         if (!ret)
2504                 ret = err;
2505         return ret;
2506 }
2507
2508 static int ext3_acquire_dquot(struct dquot *dquot)
2509 {
2510         int ret, err;
2511         handle_t *handle;
2512
2513         handle = ext3_journal_start(dquot_to_inode(dquot),
2514                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2515         if (IS_ERR(handle))
2516                 return PTR_ERR(handle);
2517         ret = dquot_acquire(dquot);
2518         err = ext3_journal_stop(handle);
2519         if (!ret)
2520                 ret = err;
2521         return ret;
2522 }
2523
2524 static int ext3_release_dquot(struct dquot *dquot)
2525 {
2526         int ret, err;
2527         handle_t *handle;
2528
2529         handle = ext3_journal_start(dquot_to_inode(dquot),
2530                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2531         if (IS_ERR(handle))
2532                 return PTR_ERR(handle);
2533         ret = dquot_release(dquot);
2534         err = ext3_journal_stop(handle);
2535         if (!ret)
2536                 ret = err;
2537         return ret;
2538 }
2539
2540 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2541 {
2542         /* Are we journalling quotas? */
2543         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2544             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2545                 dquot_mark_dquot_dirty(dquot);
2546                 return ext3_write_dquot(dquot);
2547         } else {
2548                 return dquot_mark_dquot_dirty(dquot);
2549         }
2550 }
2551
2552 static int ext3_write_info(struct super_block *sb, int type)
2553 {
2554         int ret, err;
2555         handle_t *handle;
2556
2557         /* Data block + inode block */
2558         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2559         if (IS_ERR(handle))
2560                 return PTR_ERR(handle);
2561         ret = dquot_commit_info(sb, type);
2562         err = ext3_journal_stop(handle);
2563         if (!ret)
2564                 ret = err;
2565         return ret;
2566 }
2567
2568 /*
2569  * Turn on quotas during mount time - we need to find
2570  * the quota file and such...
2571  */
2572 static int ext3_quota_on_mount(struct super_block *sb, int type)
2573 {
2574         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2575                         EXT3_SB(sb)->s_jquota_fmt, type);
2576 }
2577
2578 /*
2579  * Standard function to be called on quota_on
2580  */
2581 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2582                          char *path)
2583 {
2584         int err;
2585         struct nameidata nd;
2586
2587         if (!test_opt(sb, QUOTA))
2588                 return -EINVAL;
2589         /* Not journalling quota? */
2590         if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2591             !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2592                 return vfs_quota_on(sb, type, format_id, path);
2593         err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2594         if (err)
2595                 return err;
2596         /* Quotafile not on the same filesystem? */
2597         if (nd.mnt->mnt_sb != sb) {
2598                 path_release(&nd);
2599                 return -EXDEV;
2600         }
2601         /* Quotafile not of fs root? */
2602         if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2603                 printk(KERN_WARNING
2604                         "EXT3-fs: Quota file not on filesystem root. "
2605                         "Journalled quota will not work.\n");
2606         path_release(&nd);
2607         return vfs_quota_on(sb, type, format_id, path);
2608 }
2609
2610 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2611  * acquiring the locks... As quota files are never truncated and quota code
2612  * itself serializes the operations (and noone else should touch the files)
2613  * we don't have to be afraid of races */
2614 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2615                                size_t len, loff_t off)
2616 {
2617         struct inode *inode = sb_dqopt(sb)->files[type];
2618         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2619         int err = 0;
2620         int offset = off & (sb->s_blocksize - 1);
2621         int tocopy;
2622         size_t toread;
2623         struct buffer_head *bh;
2624         loff_t i_size = i_size_read(inode);
2625
2626         if (off > i_size)
2627                 return 0;
2628         if (off+len > i_size)
2629                 len = i_size-off;
2630         toread = len;
2631         while (toread > 0) {
2632                 tocopy = sb->s_blocksize - offset < toread ?
2633                                 sb->s_blocksize - offset : toread;
2634                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2635                 if (err)
2636                         return err;
2637                 if (!bh)        /* A hole? */
2638                         memset(data, 0, tocopy);
2639                 else
2640                         memcpy(data, bh->b_data+offset, tocopy);
2641                 brelse(bh);
2642                 offset = 0;
2643                 toread -= tocopy;
2644                 data += tocopy;
2645                 blk++;
2646         }
2647         return len;
2648 }
2649
2650 /* Write to quotafile (we know the transaction is already started and has
2651  * enough credits) */
2652 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2653                                 const char *data, size_t len, loff_t off)
2654 {
2655         struct inode *inode = sb_dqopt(sb)->files[type];
2656         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2657         int err = 0;
2658         int offset = off & (sb->s_blocksize - 1);
2659         int tocopy;
2660         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2661         size_t towrite = len;
2662         struct buffer_head *bh;
2663         handle_t *handle = journal_current_handle();
2664
2665         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2666         while (towrite > 0) {
2667                 tocopy = sb->s_blocksize - offset < towrite ?
2668                                 sb->s_blocksize - offset : towrite;
2669                 bh = ext3_bread(handle, inode, blk, 1, &err);
2670                 if (!bh)
2671                         goto out;
2672                 if (journal_quota) {
2673                         err = ext3_journal_get_write_access(handle, bh);
2674                         if (err) {
2675                                 brelse(bh);
2676                                 goto out;
2677                         }
2678                 }
2679                 lock_buffer(bh);
2680                 memcpy(bh->b_data+offset, data, tocopy);
2681                 flush_dcache_page(bh->b_page);
2682                 unlock_buffer(bh);
2683                 if (journal_quota)
2684                         err = ext3_journal_dirty_metadata(handle, bh);
2685                 else {
2686                         /* Always do at least ordered writes for quotas */
2687                         err = ext3_journal_dirty_data(handle, bh);
2688                         mark_buffer_dirty(bh);
2689                 }
2690                 brelse(bh);
2691                 if (err)
2692                         goto out;
2693                 offset = 0;
2694                 towrite -= tocopy;
2695                 data += tocopy;
2696                 blk++;
2697         }
2698 out:
2699         if (len == towrite)
2700                 return err;
2701         if (inode->i_size < off+len-towrite) {
2702                 i_size_write(inode, off+len-towrite);
2703                 EXT3_I(inode)->i_disksize = inode->i_size;
2704         }
2705         inode->i_version++;
2706         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2707         ext3_mark_inode_dirty(handle, inode);
2708         mutex_unlock(&inode->i_mutex);
2709         return len - towrite;
2710 }
2711
2712 #endif
2713
2714 static int ext3_get_sb(struct file_system_type *fs_type,
2715         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2716 {
2717         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2718 }
2719
2720 static struct file_system_type ext3_fs_type = {
2721         .owner          = THIS_MODULE,
2722         .name           = "ext3",
2723         .get_sb         = ext3_get_sb,
2724         .kill_sb        = kill_block_super,
2725         .fs_flags       = FS_REQUIRES_DEV,
2726 };
2727
2728 static int __init init_ext3_fs(void)
2729 {
2730         int err = init_ext3_xattr();
2731         if (err)
2732                 return err;
2733         err = init_inodecache();
2734         if (err)
2735                 goto out1;
2736         err = register_filesystem(&ext3_fs_type);
2737         if (err)
2738                 goto out;
2739         return 0;
2740 out:
2741         destroy_inodecache();
2742 out1:
2743         exit_ext3_xattr();
2744         return err;
2745 }
2746
2747 static void __exit exit_ext3_fs(void)
2748 {
2749         unregister_filesystem(&ext3_fs_type);
2750         destroy_inodecache();
2751         exit_ext3_xattr();
2752 }
2753
2754 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2755 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2756 MODULE_LICENSE("GPL");
2757 module_init(init_ext3_fs)
2758 module_exit(exit_ext3_fs)