4f84dc86628aeeb96706fc11c844442ff9b875f2
[linux-2.6.git] / fs / ext3 / super.c
1 /*
2  *  linux/fs/ext3/super.c
3  *
4  * Copyright (C) 1992, 1993, 1994, 1995
5  * Remy Card (card@masi.ibp.fr)
6  * Laboratoire MASI - Institut Blaise Pascal
7  * Universite Pierre et Marie Curie (Paris VI)
8  *
9  *  from
10  *
11  *  linux/fs/minix/inode.c
12  *
13  *  Copyright (C) 1991, 1992  Linus Torvalds
14  *
15  *  Big-endian to little-endian byte-swapping/bitmaps by
16  *        David S. Miller (davem@caip.rutgers.edu), 1995
17  */
18
19 #include <linux/module.h>
20 #include <linux/string.h>
21 #include <linux/fs.h>
22 #include <linux/time.h>
23 #include <linux/jbd.h>
24 #include <linux/ext3_fs.h>
25 #include <linux/ext3_jbd.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/blkdev.h>
29 #include <linux/parser.h>
30 #include <linux/smp_lock.h>
31 #include <linux/buffer_head.h>
32 #include <linux/exportfs.h>
33 #include <linux/vfs.h>
34 #include <linux/random.h>
35 #include <linux/mount.h>
36 #include <linux/namei.h>
37 #include <linux/quotaops.h>
38 #include <linux/seq_file.h>
39 #include <linux/log2.h>
40
41 #include <asm/uaccess.h>
42
43 #include "xattr.h"
44 #include "acl.h"
45 #include "namei.h"
46
47 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
48                              unsigned long journal_devnum);
49 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
50                                unsigned int);
51 static void ext3_commit_super (struct super_block * sb,
52                                struct ext3_super_block * es,
53                                int sync);
54 static void ext3_mark_recovery_complete(struct super_block * sb,
55                                         struct ext3_super_block * es);
56 static void ext3_clear_journal_err(struct super_block * sb,
57                                    struct ext3_super_block * es);
58 static int ext3_sync_fs(struct super_block *sb, int wait);
59 static const char *ext3_decode_error(struct super_block * sb, int errno,
60                                      char nbuf[16]);
61 static int ext3_remount (struct super_block * sb, int * flags, char * data);
62 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
63 static void ext3_unlockfs(struct super_block *sb);
64 static void ext3_write_super (struct super_block * sb);
65 static void ext3_write_super_lockfs(struct super_block *sb);
66
67 /*
68  * Wrappers for journal_start/end.
69  *
70  * The only special thing we need to do here is to make sure that all
71  * journal_end calls result in the superblock being marked dirty, so
72  * that sync() will call the filesystem's write_super callback if
73  * appropriate.
74  */
75 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
76 {
77         journal_t *journal;
78
79         if (sb->s_flags & MS_RDONLY)
80                 return ERR_PTR(-EROFS);
81
82         /* Special case here: if the journal has aborted behind our
83          * backs (eg. EIO in the commit thread), then we still need to
84          * take the FS itself readonly cleanly. */
85         journal = EXT3_SB(sb)->s_journal;
86         if (is_journal_aborted(journal)) {
87                 ext3_abort(sb, __FUNCTION__,
88                            "Detected aborted journal");
89                 return ERR_PTR(-EROFS);
90         }
91
92         return journal_start(journal, nblocks);
93 }
94
95 /*
96  * The only special thing we need to do here is to make sure that all
97  * journal_stop calls result in the superblock being marked dirty, so
98  * that sync() will call the filesystem's write_super callback if
99  * appropriate.
100  */
101 int __ext3_journal_stop(const char *where, handle_t *handle)
102 {
103         struct super_block *sb;
104         int err;
105         int rc;
106
107         sb = handle->h_transaction->t_journal->j_private;
108         err = handle->h_err;
109         rc = journal_stop(handle);
110
111         if (!err)
112                 err = rc;
113         if (err)
114                 __ext3_std_error(sb, where, err);
115         return err;
116 }
117
118 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
119                 struct buffer_head *bh, handle_t *handle, int err)
120 {
121         char nbuf[16];
122         const char *errstr = ext3_decode_error(NULL, err, nbuf);
123
124         if (bh)
125                 BUFFER_TRACE(bh, "abort");
126
127         if (!handle->h_err)
128                 handle->h_err = err;
129
130         if (is_handle_aborted(handle))
131                 return;
132
133         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
134                caller, errstr, err_fn);
135
136         journal_abort_handle(handle);
137 }
138
139 /* Deal with the reporting of failure conditions on a filesystem such as
140  * inconsistencies detected or read IO failures.
141  *
142  * On ext2, we can store the error state of the filesystem in the
143  * superblock.  That is not possible on ext3, because we may have other
144  * write ordering constraints on the superblock which prevent us from
145  * writing it out straight away; and given that the journal is about to
146  * be aborted, we can't rely on the current, or future, transactions to
147  * write out the superblock safely.
148  *
149  * We'll just use the journal_abort() error code to record an error in
150  * the journal instead.  On recovery, the journal will compain about
151  * that error until we've noted it down and cleared it.
152  */
153
154 static void ext3_handle_error(struct super_block *sb)
155 {
156         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
157
158         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
159         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
160
161         if (sb->s_flags & MS_RDONLY)
162                 return;
163
164         if (!test_opt (sb, ERRORS_CONT)) {
165                 journal_t *journal = EXT3_SB(sb)->s_journal;
166
167                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
168                 if (journal)
169                         journal_abort(journal, -EIO);
170         }
171         if (test_opt (sb, ERRORS_RO)) {
172                 printk (KERN_CRIT "Remounting filesystem read-only\n");
173                 sb->s_flags |= MS_RDONLY;
174         }
175         ext3_commit_super(sb, es, 1);
176         if (test_opt(sb, ERRORS_PANIC))
177                 panic("EXT3-fs (device %s): panic forced after error\n",
178                         sb->s_id);
179 }
180
181 void ext3_error (struct super_block * sb, const char * function,
182                  const char * fmt, ...)
183 {
184         va_list args;
185
186         va_start(args, fmt);
187         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
188         vprintk(fmt, args);
189         printk("\n");
190         va_end(args);
191
192         ext3_handle_error(sb);
193 }
194
195 static const char *ext3_decode_error(struct super_block * sb, int errno,
196                                      char nbuf[16])
197 {
198         char *errstr = NULL;
199
200         switch (errno) {
201         case -EIO:
202                 errstr = "IO failure";
203                 break;
204         case -ENOMEM:
205                 errstr = "Out of memory";
206                 break;
207         case -EROFS:
208                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
209                         errstr = "Journal has aborted";
210                 else
211                         errstr = "Readonly filesystem";
212                 break;
213         default:
214                 /* If the caller passed in an extra buffer for unknown
215                  * errors, textualise them now.  Else we just return
216                  * NULL. */
217                 if (nbuf) {
218                         /* Check for truncated error codes... */
219                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
220                                 errstr = nbuf;
221                 }
222                 break;
223         }
224
225         return errstr;
226 }
227
228 /* __ext3_std_error decodes expected errors from journaling functions
229  * automatically and invokes the appropriate error response.  */
230
231 void __ext3_std_error (struct super_block * sb, const char * function,
232                        int errno)
233 {
234         char nbuf[16];
235         const char *errstr;
236
237         /* Special case: if the error is EROFS, and we're not already
238          * inside a transaction, then there's really no point in logging
239          * an error. */
240         if (errno == -EROFS && journal_current_handle() == NULL &&
241             (sb->s_flags & MS_RDONLY))
242                 return;
243
244         errstr = ext3_decode_error(sb, errno, nbuf);
245         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
246                 sb->s_id, function, errstr);
247
248         ext3_handle_error(sb);
249 }
250
251 /*
252  * ext3_abort is a much stronger failure handler than ext3_error.  The
253  * abort function may be used to deal with unrecoverable failures such
254  * as journal IO errors or ENOMEM at a critical moment in log management.
255  *
256  * We unconditionally force the filesystem into an ABORT|READONLY state,
257  * unless the error response on the fs has been set to panic in which
258  * case we take the easy way out and panic immediately.
259  */
260
261 void ext3_abort (struct super_block * sb, const char * function,
262                  const char * fmt, ...)
263 {
264         va_list args;
265
266         printk (KERN_CRIT "ext3_abort called.\n");
267
268         va_start(args, fmt);
269         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
270         vprintk(fmt, args);
271         printk("\n");
272         va_end(args);
273
274         if (test_opt(sb, ERRORS_PANIC))
275                 panic("EXT3-fs panic from previous error\n");
276
277         if (sb->s_flags & MS_RDONLY)
278                 return;
279
280         printk(KERN_CRIT "Remounting filesystem read-only\n");
281         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
282         sb->s_flags |= MS_RDONLY;
283         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
284         journal_abort(EXT3_SB(sb)->s_journal, -EIO);
285 }
286
287 void ext3_warning (struct super_block * sb, const char * function,
288                    const char * fmt, ...)
289 {
290         va_list args;
291
292         va_start(args, fmt);
293         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
294                sb->s_id, function);
295         vprintk(fmt, args);
296         printk("\n");
297         va_end(args);
298 }
299
300 void ext3_update_dynamic_rev(struct super_block *sb)
301 {
302         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
303
304         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
305                 return;
306
307         ext3_warning(sb, __FUNCTION__,
308                      "updating to rev %d because of new feature flag, "
309                      "running e2fsck is recommended",
310                      EXT3_DYNAMIC_REV);
311
312         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
313         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
314         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
315         /* leave es->s_feature_*compat flags alone */
316         /* es->s_uuid will be set by e2fsck if empty */
317
318         /*
319          * The rest of the superblock fields should be zero, and if not it
320          * means they are likely already in use, so leave them alone.  We
321          * can leave it up to e2fsck to clean up any inconsistencies there.
322          */
323 }
324
325 /*
326  * Open the external journal device
327  */
328 static struct block_device *ext3_blkdev_get(dev_t dev)
329 {
330         struct block_device *bdev;
331         char b[BDEVNAME_SIZE];
332
333         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
334         if (IS_ERR(bdev))
335                 goto fail;
336         return bdev;
337
338 fail:
339         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
340                         __bdevname(dev, b), PTR_ERR(bdev));
341         return NULL;
342 }
343
344 /*
345  * Release the journal device
346  */
347 static int ext3_blkdev_put(struct block_device *bdev)
348 {
349         bd_release(bdev);
350         return blkdev_put(bdev);
351 }
352
353 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
354 {
355         struct block_device *bdev;
356         int ret = -ENODEV;
357
358         bdev = sbi->journal_bdev;
359         if (bdev) {
360                 ret = ext3_blkdev_put(bdev);
361                 sbi->journal_bdev = NULL;
362         }
363         return ret;
364 }
365
366 static inline struct inode *orphan_list_entry(struct list_head *l)
367 {
368         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
369 }
370
371 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
372 {
373         struct list_head *l;
374
375         printk(KERN_ERR "sb orphan head is %d\n",
376                le32_to_cpu(sbi->s_es->s_last_orphan));
377
378         printk(KERN_ERR "sb_info orphan list:\n");
379         list_for_each(l, &sbi->s_orphan) {
380                 struct inode *inode = orphan_list_entry(l);
381                 printk(KERN_ERR "  "
382                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
383                        inode->i_sb->s_id, inode->i_ino, inode,
384                        inode->i_mode, inode->i_nlink,
385                        NEXT_ORPHAN(inode));
386         }
387 }
388
389 static void ext3_put_super (struct super_block * sb)
390 {
391         struct ext3_sb_info *sbi = EXT3_SB(sb);
392         struct ext3_super_block *es = sbi->s_es;
393         int i;
394
395         ext3_xattr_put_super(sb);
396         journal_destroy(sbi->s_journal);
397         if (!(sb->s_flags & MS_RDONLY)) {
398                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
399                 es->s_state = cpu_to_le16(sbi->s_mount_state);
400                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
401                 mark_buffer_dirty(sbi->s_sbh);
402                 ext3_commit_super(sb, es, 1);
403         }
404
405         for (i = 0; i < sbi->s_gdb_count; i++)
406                 brelse(sbi->s_group_desc[i]);
407         kfree(sbi->s_group_desc);
408         percpu_counter_destroy(&sbi->s_freeblocks_counter);
409         percpu_counter_destroy(&sbi->s_freeinodes_counter);
410         percpu_counter_destroy(&sbi->s_dirs_counter);
411         brelse(sbi->s_sbh);
412 #ifdef CONFIG_QUOTA
413         for (i = 0; i < MAXQUOTAS; i++)
414                 kfree(sbi->s_qf_names[i]);
415 #endif
416
417         /* Debugging code just in case the in-memory inode orphan list
418          * isn't empty.  The on-disk one can be non-empty if we've
419          * detected an error and taken the fs readonly, but the
420          * in-memory list had better be clean by this point. */
421         if (!list_empty(&sbi->s_orphan))
422                 dump_orphan_list(sb, sbi);
423         J_ASSERT(list_empty(&sbi->s_orphan));
424
425         invalidate_bdev(sb->s_bdev);
426         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
427                 /*
428                  * Invalidate the journal device's buffers.  We don't want them
429                  * floating about in memory - the physical journal device may
430                  * hotswapped, and it breaks the `ro-after' testing code.
431                  */
432                 sync_blockdev(sbi->journal_bdev);
433                 invalidate_bdev(sbi->journal_bdev);
434                 ext3_blkdev_remove(sbi);
435         }
436         sb->s_fs_info = NULL;
437         kfree(sbi);
438         return;
439 }
440
441 static struct kmem_cache *ext3_inode_cachep;
442
443 /*
444  * Called inside transaction, so use GFP_NOFS
445  */
446 static struct inode *ext3_alloc_inode(struct super_block *sb)
447 {
448         struct ext3_inode_info *ei;
449
450         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
451         if (!ei)
452                 return NULL;
453 #ifdef CONFIG_EXT3_FS_POSIX_ACL
454         ei->i_acl = EXT3_ACL_NOT_CACHED;
455         ei->i_default_acl = EXT3_ACL_NOT_CACHED;
456 #endif
457         ei->i_block_alloc_info = NULL;
458         ei->vfs_inode.i_version = 1;
459         return &ei->vfs_inode;
460 }
461
462 static void ext3_destroy_inode(struct inode *inode)
463 {
464         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
465                 printk("EXT3 Inode %p: orphan list check failed!\n",
466                         EXT3_I(inode));
467                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
468                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
469                                 false);
470                 dump_stack();
471         }
472         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
473 }
474
475 static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
476 {
477         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
478
479         INIT_LIST_HEAD(&ei->i_orphan);
480 #ifdef CONFIG_EXT3_FS_XATTR
481         init_rwsem(&ei->xattr_sem);
482 #endif
483         mutex_init(&ei->truncate_mutex);
484         inode_init_once(&ei->vfs_inode);
485 }
486
487 static int init_inodecache(void)
488 {
489         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
490                                              sizeof(struct ext3_inode_info),
491                                              0, (SLAB_RECLAIM_ACCOUNT|
492                                                 SLAB_MEM_SPREAD),
493                                              init_once, NULL);
494         if (ext3_inode_cachep == NULL)
495                 return -ENOMEM;
496         return 0;
497 }
498
499 static void destroy_inodecache(void)
500 {
501         kmem_cache_destroy(ext3_inode_cachep);
502 }
503
504 static void ext3_clear_inode(struct inode *inode)
505 {
506         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
507 #ifdef CONFIG_EXT3_FS_POSIX_ACL
508         if (EXT3_I(inode)->i_acl &&
509                         EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
510                 posix_acl_release(EXT3_I(inode)->i_acl);
511                 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
512         }
513         if (EXT3_I(inode)->i_default_acl &&
514                         EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
515                 posix_acl_release(EXT3_I(inode)->i_default_acl);
516                 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
517         }
518 #endif
519         ext3_discard_reservation(inode);
520         EXT3_I(inode)->i_block_alloc_info = NULL;
521         if (unlikely(rsv))
522                 kfree(rsv);
523 }
524
525 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
526 {
527 #if defined(CONFIG_QUOTA)
528         struct ext3_sb_info *sbi = EXT3_SB(sb);
529
530         if (sbi->s_jquota_fmt)
531                 seq_printf(seq, ",jqfmt=%s",
532                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
533
534         if (sbi->s_qf_names[USRQUOTA])
535                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
536
537         if (sbi->s_qf_names[GRPQUOTA])
538                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
539
540         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
541                 seq_puts(seq, ",usrquota");
542
543         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
544                 seq_puts(seq, ",grpquota");
545 #endif
546 }
547
548 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
549 {
550         struct super_block *sb = vfs->mnt_sb;
551
552         if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
553                 seq_puts(seq, ",data=journal");
554         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
555                 seq_puts(seq, ",data=ordered");
556         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
557                 seq_puts(seq, ",data=writeback");
558
559         ext3_show_quota_options(seq, sb);
560
561         return 0;
562 }
563
564
565 static struct dentry *ext3_get_dentry(struct super_block *sb, void *vobjp)
566 {
567         __u32 *objp = vobjp;
568         unsigned long ino = objp[0];
569         __u32 generation = objp[1];
570         struct inode *inode;
571         struct dentry *result;
572
573         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
574                 return ERR_PTR(-ESTALE);
575         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
576                 return ERR_PTR(-ESTALE);
577
578         /* iget isn't really right if the inode is currently unallocated!!
579          *
580          * ext3_read_inode will return a bad_inode if the inode had been
581          * deleted, so we should be safe.
582          *
583          * Currently we don't know the generation for parent directory, so
584          * a generation of 0 means "accept any"
585          */
586         inode = iget(sb, ino);
587         if (inode == NULL)
588                 return ERR_PTR(-ENOMEM);
589         if (is_bad_inode(inode) ||
590             (generation && inode->i_generation != generation)) {
591                 iput(inode);
592                 return ERR_PTR(-ESTALE);
593         }
594         /* now to find a dentry.
595          * If possible, get a well-connected one
596          */
597         result = d_alloc_anon(inode);
598         if (!result) {
599                 iput(inode);
600                 return ERR_PTR(-ENOMEM);
601         }
602         return result;
603 }
604
605 #ifdef CONFIG_QUOTA
606 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
607 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
608
609 static int ext3_dquot_initialize(struct inode *inode, int type);
610 static int ext3_dquot_drop(struct inode *inode);
611 static int ext3_write_dquot(struct dquot *dquot);
612 static int ext3_acquire_dquot(struct dquot *dquot);
613 static int ext3_release_dquot(struct dquot *dquot);
614 static int ext3_mark_dquot_dirty(struct dquot *dquot);
615 static int ext3_write_info(struct super_block *sb, int type);
616 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
617 static int ext3_quota_on_mount(struct super_block *sb, int type);
618 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
619                                size_t len, loff_t off);
620 static ssize_t ext3_quota_write(struct super_block *sb, int type,
621                                 const char *data, size_t len, loff_t off);
622
623 static struct dquot_operations ext3_quota_operations = {
624         .initialize     = ext3_dquot_initialize,
625         .drop           = ext3_dquot_drop,
626         .alloc_space    = dquot_alloc_space,
627         .alloc_inode    = dquot_alloc_inode,
628         .free_space     = dquot_free_space,
629         .free_inode     = dquot_free_inode,
630         .transfer       = dquot_transfer,
631         .write_dquot    = ext3_write_dquot,
632         .acquire_dquot  = ext3_acquire_dquot,
633         .release_dquot  = ext3_release_dquot,
634         .mark_dirty     = ext3_mark_dquot_dirty,
635         .write_info     = ext3_write_info
636 };
637
638 static struct quotactl_ops ext3_qctl_operations = {
639         .quota_on       = ext3_quota_on,
640         .quota_off      = vfs_quota_off,
641         .quota_sync     = vfs_quota_sync,
642         .get_info       = vfs_get_dqinfo,
643         .set_info       = vfs_set_dqinfo,
644         .get_dqblk      = vfs_get_dqblk,
645         .set_dqblk      = vfs_set_dqblk
646 };
647 #endif
648
649 static const struct super_operations ext3_sops = {
650         .alloc_inode    = ext3_alloc_inode,
651         .destroy_inode  = ext3_destroy_inode,
652         .read_inode     = ext3_read_inode,
653         .write_inode    = ext3_write_inode,
654         .dirty_inode    = ext3_dirty_inode,
655         .delete_inode   = ext3_delete_inode,
656         .put_super      = ext3_put_super,
657         .write_super    = ext3_write_super,
658         .sync_fs        = ext3_sync_fs,
659         .write_super_lockfs = ext3_write_super_lockfs,
660         .unlockfs       = ext3_unlockfs,
661         .statfs         = ext3_statfs,
662         .remount_fs     = ext3_remount,
663         .clear_inode    = ext3_clear_inode,
664         .show_options   = ext3_show_options,
665 #ifdef CONFIG_QUOTA
666         .quota_read     = ext3_quota_read,
667         .quota_write    = ext3_quota_write,
668 #endif
669 };
670
671 static struct export_operations ext3_export_ops = {
672         .get_parent = ext3_get_parent,
673         .get_dentry = ext3_get_dentry,
674 };
675
676 enum {
677         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
678         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
679         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
680         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
681         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
682         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
683         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
684         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
685         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
686         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
687         Opt_grpquota
688 };
689
690 static match_table_t tokens = {
691         {Opt_bsd_df, "bsddf"},
692         {Opt_minix_df, "minixdf"},
693         {Opt_grpid, "grpid"},
694         {Opt_grpid, "bsdgroups"},
695         {Opt_nogrpid, "nogrpid"},
696         {Opt_nogrpid, "sysvgroups"},
697         {Opt_resgid, "resgid=%u"},
698         {Opt_resuid, "resuid=%u"},
699         {Opt_sb, "sb=%u"},
700         {Opt_err_cont, "errors=continue"},
701         {Opt_err_panic, "errors=panic"},
702         {Opt_err_ro, "errors=remount-ro"},
703         {Opt_nouid32, "nouid32"},
704         {Opt_nocheck, "nocheck"},
705         {Opt_nocheck, "check=none"},
706         {Opt_debug, "debug"},
707         {Opt_oldalloc, "oldalloc"},
708         {Opt_orlov, "orlov"},
709         {Opt_user_xattr, "user_xattr"},
710         {Opt_nouser_xattr, "nouser_xattr"},
711         {Opt_acl, "acl"},
712         {Opt_noacl, "noacl"},
713         {Opt_reservation, "reservation"},
714         {Opt_noreservation, "noreservation"},
715         {Opt_noload, "noload"},
716         {Opt_nobh, "nobh"},
717         {Opt_bh, "bh"},
718         {Opt_commit, "commit=%u"},
719         {Opt_journal_update, "journal=update"},
720         {Opt_journal_inum, "journal=%u"},
721         {Opt_journal_dev, "journal_dev=%u"},
722         {Opt_abort, "abort"},
723         {Opt_data_journal, "data=journal"},
724         {Opt_data_ordered, "data=ordered"},
725         {Opt_data_writeback, "data=writeback"},
726         {Opt_offusrjquota, "usrjquota="},
727         {Opt_usrjquota, "usrjquota=%s"},
728         {Opt_offgrpjquota, "grpjquota="},
729         {Opt_grpjquota, "grpjquota=%s"},
730         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
731         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
732         {Opt_grpquota, "grpquota"},
733         {Opt_noquota, "noquota"},
734         {Opt_quota, "quota"},
735         {Opt_usrquota, "usrquota"},
736         {Opt_barrier, "barrier=%u"},
737         {Opt_err, NULL},
738         {Opt_resize, "resize"},
739 };
740
741 static ext3_fsblk_t get_sb_block(void **data)
742 {
743         ext3_fsblk_t    sb_block;
744         char            *options = (char *) *data;
745
746         if (!options || strncmp(options, "sb=", 3) != 0)
747                 return 1;       /* Default location */
748         options += 3;
749         /*todo: use simple_strtoll with >32bit ext3 */
750         sb_block = simple_strtoul(options, &options, 0);
751         if (*options && *options != ',') {
752                 printk("EXT3-fs: Invalid sb specification: %s\n",
753                        (char *) *data);
754                 return 1;
755         }
756         if (*options == ',')
757                 options++;
758         *data = (void *) options;
759         return sb_block;
760 }
761
762 static int parse_options (char *options, struct super_block *sb,
763                           unsigned int *inum, unsigned long *journal_devnum,
764                           ext3_fsblk_t *n_blocks_count, int is_remount)
765 {
766         struct ext3_sb_info *sbi = EXT3_SB(sb);
767         char * p;
768         substring_t args[MAX_OPT_ARGS];
769         int data_opt = 0;
770         int option;
771 #ifdef CONFIG_QUOTA
772         int qtype;
773         char *qname;
774 #endif
775
776         if (!options)
777                 return 1;
778
779         while ((p = strsep (&options, ",")) != NULL) {
780                 int token;
781                 if (!*p)
782                         continue;
783
784                 token = match_token(p, tokens, args);
785                 switch (token) {
786                 case Opt_bsd_df:
787                         clear_opt (sbi->s_mount_opt, MINIX_DF);
788                         break;
789                 case Opt_minix_df:
790                         set_opt (sbi->s_mount_opt, MINIX_DF);
791                         break;
792                 case Opt_grpid:
793                         set_opt (sbi->s_mount_opt, GRPID);
794                         break;
795                 case Opt_nogrpid:
796                         clear_opt (sbi->s_mount_opt, GRPID);
797                         break;
798                 case Opt_resuid:
799                         if (match_int(&args[0], &option))
800                                 return 0;
801                         sbi->s_resuid = option;
802                         break;
803                 case Opt_resgid:
804                         if (match_int(&args[0], &option))
805                                 return 0;
806                         sbi->s_resgid = option;
807                         break;
808                 case Opt_sb:
809                         /* handled by get_sb_block() instead of here */
810                         /* *sb_block = match_int(&args[0]); */
811                         break;
812                 case Opt_err_panic:
813                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
814                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
815                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
816                         break;
817                 case Opt_err_ro:
818                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
819                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
820                         set_opt (sbi->s_mount_opt, ERRORS_RO);
821                         break;
822                 case Opt_err_cont:
823                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
824                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
825                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
826                         break;
827                 case Opt_nouid32:
828                         set_opt (sbi->s_mount_opt, NO_UID32);
829                         break;
830                 case Opt_nocheck:
831                         clear_opt (sbi->s_mount_opt, CHECK);
832                         break;
833                 case Opt_debug:
834                         set_opt (sbi->s_mount_opt, DEBUG);
835                         break;
836                 case Opt_oldalloc:
837                         set_opt (sbi->s_mount_opt, OLDALLOC);
838                         break;
839                 case Opt_orlov:
840                         clear_opt (sbi->s_mount_opt, OLDALLOC);
841                         break;
842 #ifdef CONFIG_EXT3_FS_XATTR
843                 case Opt_user_xattr:
844                         set_opt (sbi->s_mount_opt, XATTR_USER);
845                         break;
846                 case Opt_nouser_xattr:
847                         clear_opt (sbi->s_mount_opt, XATTR_USER);
848                         break;
849 #else
850                 case Opt_user_xattr:
851                 case Opt_nouser_xattr:
852                         printk("EXT3 (no)user_xattr options not supported\n");
853                         break;
854 #endif
855 #ifdef CONFIG_EXT3_FS_POSIX_ACL
856                 case Opt_acl:
857                         set_opt(sbi->s_mount_opt, POSIX_ACL);
858                         break;
859                 case Opt_noacl:
860                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
861                         break;
862 #else
863                 case Opt_acl:
864                 case Opt_noacl:
865                         printk("EXT3 (no)acl options not supported\n");
866                         break;
867 #endif
868                 case Opt_reservation:
869                         set_opt(sbi->s_mount_opt, RESERVATION);
870                         break;
871                 case Opt_noreservation:
872                         clear_opt(sbi->s_mount_opt, RESERVATION);
873                         break;
874                 case Opt_journal_update:
875                         /* @@@ FIXME */
876                         /* Eventually we will want to be able to create
877                            a journal file here.  For now, only allow the
878                            user to specify an existing inode to be the
879                            journal file. */
880                         if (is_remount) {
881                                 printk(KERN_ERR "EXT3-fs: cannot specify "
882                                        "journal on remount\n");
883                                 return 0;
884                         }
885                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
886                         break;
887                 case Opt_journal_inum:
888                         if (is_remount) {
889                                 printk(KERN_ERR "EXT3-fs: cannot specify "
890                                        "journal on remount\n");
891                                 return 0;
892                         }
893                         if (match_int(&args[0], &option))
894                                 return 0;
895                         *inum = option;
896                         break;
897                 case Opt_journal_dev:
898                         if (is_remount) {
899                                 printk(KERN_ERR "EXT3-fs: cannot specify "
900                                        "journal on remount\n");
901                                 return 0;
902                         }
903                         if (match_int(&args[0], &option))
904                                 return 0;
905                         *journal_devnum = option;
906                         break;
907                 case Opt_noload:
908                         set_opt (sbi->s_mount_opt, NOLOAD);
909                         break;
910                 case Opt_commit:
911                         if (match_int(&args[0], &option))
912                                 return 0;
913                         if (option < 0)
914                                 return 0;
915                         if (option == 0)
916                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
917                         sbi->s_commit_interval = HZ * option;
918                         break;
919                 case Opt_data_journal:
920                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
921                         goto datacheck;
922                 case Opt_data_ordered:
923                         data_opt = EXT3_MOUNT_ORDERED_DATA;
924                         goto datacheck;
925                 case Opt_data_writeback:
926                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
927                 datacheck:
928                         if (is_remount) {
929                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
930                                                 != data_opt) {
931                                         printk(KERN_ERR
932                                                 "EXT3-fs: cannot change data "
933                                                 "mode on remount\n");
934                                         return 0;
935                                 }
936                         } else {
937                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
938                                 sbi->s_mount_opt |= data_opt;
939                         }
940                         break;
941 #ifdef CONFIG_QUOTA
942                 case Opt_usrjquota:
943                         qtype = USRQUOTA;
944                         goto set_qf_name;
945                 case Opt_grpjquota:
946                         qtype = GRPQUOTA;
947 set_qf_name:
948                         if (sb_any_quota_enabled(sb)) {
949                                 printk(KERN_ERR
950                                         "EXT3-fs: Cannot change journalled "
951                                         "quota options when quota turned on.\n");
952                                 return 0;
953                         }
954                         qname = match_strdup(&args[0]);
955                         if (!qname) {
956                                 printk(KERN_ERR
957                                         "EXT3-fs: not enough memory for "
958                                         "storing quotafile name.\n");
959                                 return 0;
960                         }
961                         if (sbi->s_qf_names[qtype] &&
962                             strcmp(sbi->s_qf_names[qtype], qname)) {
963                                 printk(KERN_ERR
964                                         "EXT3-fs: %s quota file already "
965                                         "specified.\n", QTYPE2NAME(qtype));
966                                 kfree(qname);
967                                 return 0;
968                         }
969                         sbi->s_qf_names[qtype] = qname;
970                         if (strchr(sbi->s_qf_names[qtype], '/')) {
971                                 printk(KERN_ERR
972                                         "EXT3-fs: quotafile must be on "
973                                         "filesystem root.\n");
974                                 kfree(sbi->s_qf_names[qtype]);
975                                 sbi->s_qf_names[qtype] = NULL;
976                                 return 0;
977                         }
978                         set_opt(sbi->s_mount_opt, QUOTA);
979                         break;
980                 case Opt_offusrjquota:
981                         qtype = USRQUOTA;
982                         goto clear_qf_name;
983                 case Opt_offgrpjquota:
984                         qtype = GRPQUOTA;
985 clear_qf_name:
986                         if (sb_any_quota_enabled(sb)) {
987                                 printk(KERN_ERR "EXT3-fs: Cannot change "
988                                         "journalled quota options when "
989                                         "quota turned on.\n");
990                                 return 0;
991                         }
992                         /*
993                          * The space will be released later when all options
994                          * are confirmed to be correct
995                          */
996                         sbi->s_qf_names[qtype] = NULL;
997                         break;
998                 case Opt_jqfmt_vfsold:
999                         sbi->s_jquota_fmt = QFMT_VFS_OLD;
1000                         break;
1001                 case Opt_jqfmt_vfsv0:
1002                         sbi->s_jquota_fmt = QFMT_VFS_V0;
1003                         break;
1004                 case Opt_quota:
1005                 case Opt_usrquota:
1006                         set_opt(sbi->s_mount_opt, QUOTA);
1007                         set_opt(sbi->s_mount_opt, USRQUOTA);
1008                         break;
1009                 case Opt_grpquota:
1010                         set_opt(sbi->s_mount_opt, QUOTA);
1011                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1012                         break;
1013                 case Opt_noquota:
1014                         if (sb_any_quota_enabled(sb)) {
1015                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1016                                         "options when quota turned on.\n");
1017                                 return 0;
1018                         }
1019                         clear_opt(sbi->s_mount_opt, QUOTA);
1020                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1021                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1022                         break;
1023 #else
1024                 case Opt_quota:
1025                 case Opt_usrquota:
1026                 case Opt_grpquota:
1027                 case Opt_usrjquota:
1028                 case Opt_grpjquota:
1029                 case Opt_offusrjquota:
1030                 case Opt_offgrpjquota:
1031                 case Opt_jqfmt_vfsold:
1032                 case Opt_jqfmt_vfsv0:
1033                         printk(KERN_ERR
1034                                 "EXT3-fs: journalled quota options not "
1035                                 "supported.\n");
1036                         break;
1037                 case Opt_noquota:
1038                         break;
1039 #endif
1040                 case Opt_abort:
1041                         set_opt(sbi->s_mount_opt, ABORT);
1042                         break;
1043                 case Opt_barrier:
1044                         if (match_int(&args[0], &option))
1045                                 return 0;
1046                         if (option)
1047                                 set_opt(sbi->s_mount_opt, BARRIER);
1048                         else
1049                                 clear_opt(sbi->s_mount_opt, BARRIER);
1050                         break;
1051                 case Opt_ignore:
1052                         break;
1053                 case Opt_resize:
1054                         if (!is_remount) {
1055                                 printk("EXT3-fs: resize option only available "
1056                                         "for remount\n");
1057                                 return 0;
1058                         }
1059                         if (match_int(&args[0], &option) != 0)
1060                                 return 0;
1061                         *n_blocks_count = option;
1062                         break;
1063                 case Opt_nobh:
1064                         set_opt(sbi->s_mount_opt, NOBH);
1065                         break;
1066                 case Opt_bh:
1067                         clear_opt(sbi->s_mount_opt, NOBH);
1068                         break;
1069                 default:
1070                         printk (KERN_ERR
1071                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1072                                 "or missing value\n", p);
1073                         return 0;
1074                 }
1075         }
1076 #ifdef CONFIG_QUOTA
1077         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1078                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1079                      sbi->s_qf_names[USRQUOTA])
1080                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1081
1082                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1083                      sbi->s_qf_names[GRPQUOTA])
1084                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1085
1086                 if ((sbi->s_qf_names[USRQUOTA] &&
1087                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1088                     (sbi->s_qf_names[GRPQUOTA] &&
1089                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1090                         printk(KERN_ERR "EXT3-fs: old and new quota "
1091                                         "format mixing.\n");
1092                         return 0;
1093                 }
1094
1095                 if (!sbi->s_jquota_fmt) {
1096                         printk(KERN_ERR "EXT3-fs: journalled quota format "
1097                                         "not specified.\n");
1098                         return 0;
1099                 }
1100         } else {
1101                 if (sbi->s_jquota_fmt) {
1102                         printk(KERN_ERR "EXT3-fs: journalled quota format "
1103                                         "specified with no journalling "
1104                                         "enabled.\n");
1105                         return 0;
1106                 }
1107         }
1108 #endif
1109         return 1;
1110 }
1111
1112 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1113                             int read_only)
1114 {
1115         struct ext3_sb_info *sbi = EXT3_SB(sb);
1116         int res = 0;
1117
1118         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1119                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1120                         "forcing read-only mode\n");
1121                 res = MS_RDONLY;
1122         }
1123         if (read_only)
1124                 return res;
1125         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1126                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1127                         "running e2fsck is recommended\n");
1128         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1129                 printk (KERN_WARNING
1130                         "EXT3-fs warning: mounting fs with errors, "
1131                         "running e2fsck is recommended\n");
1132         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1133                  le16_to_cpu(es->s_mnt_count) >=
1134                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1135                 printk (KERN_WARNING
1136                         "EXT3-fs warning: maximal mount count reached, "
1137                         "running e2fsck is recommended\n");
1138         else if (le32_to_cpu(es->s_checkinterval) &&
1139                 (le32_to_cpu(es->s_lastcheck) +
1140                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1141                 printk (KERN_WARNING
1142                         "EXT3-fs warning: checktime reached, "
1143                         "running e2fsck is recommended\n");
1144 #if 0
1145                 /* @@@ We _will_ want to clear the valid bit if we find
1146                    inconsistencies, to force a fsck at reboot.  But for
1147                    a plain journaled filesystem we can keep it set as
1148                    valid forever! :) */
1149         es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1150 #endif
1151         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1152                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1153         es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1154         es->s_mtime = cpu_to_le32(get_seconds());
1155         ext3_update_dynamic_rev(sb);
1156         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1157
1158         ext3_commit_super(sb, es, 1);
1159         if (test_opt(sb, DEBUG))
1160                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1161                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1162                         sb->s_blocksize,
1163                         sbi->s_groups_count,
1164                         EXT3_BLOCKS_PER_GROUP(sb),
1165                         EXT3_INODES_PER_GROUP(sb),
1166                         sbi->s_mount_opt);
1167
1168         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1169         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1170                 char b[BDEVNAME_SIZE];
1171
1172                 printk("external journal on %s\n",
1173                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1174         } else {
1175                 printk("internal journal\n");
1176         }
1177         return res;
1178 }
1179
1180 /* Called at mount-time, super-block is locked */
1181 static int ext3_check_descriptors (struct super_block * sb)
1182 {
1183         struct ext3_sb_info *sbi = EXT3_SB(sb);
1184         ext3_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1185         ext3_fsblk_t last_block;
1186         struct ext3_group_desc * gdp = NULL;
1187         int desc_block = 0;
1188         int i;
1189
1190         ext3_debug ("Checking group descriptors");
1191
1192         for (i = 0; i < sbi->s_groups_count; i++)
1193         {
1194                 if (i == sbi->s_groups_count - 1)
1195                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1196                 else
1197                         last_block = first_block +
1198                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1199
1200                 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1201                         gdp = (struct ext3_group_desc *)
1202                                         sbi->s_group_desc[desc_block++]->b_data;
1203                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1204                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1205                 {
1206                         ext3_error (sb, "ext3_check_descriptors",
1207                                     "Block bitmap for group %d"
1208                                     " not in group (block %lu)!",
1209                                     i, (unsigned long)
1210                                         le32_to_cpu(gdp->bg_block_bitmap));
1211                         return 0;
1212                 }
1213                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1214                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1215                 {
1216                         ext3_error (sb, "ext3_check_descriptors",
1217                                     "Inode bitmap for group %d"
1218                                     " not in group (block %lu)!",
1219                                     i, (unsigned long)
1220                                         le32_to_cpu(gdp->bg_inode_bitmap));
1221                         return 0;
1222                 }
1223                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1224                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >
1225                     last_block)
1226                 {
1227                         ext3_error (sb, "ext3_check_descriptors",
1228                                     "Inode table for group %d"
1229                                     " not in group (block %lu)!",
1230                                     i, (unsigned long)
1231                                         le32_to_cpu(gdp->bg_inode_table));
1232                         return 0;
1233                 }
1234                 first_block += EXT3_BLOCKS_PER_GROUP(sb);
1235                 gdp++;
1236         }
1237
1238         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1239         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1240         return 1;
1241 }
1242
1243
1244 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1245  * the superblock) which were deleted from all directories, but held open by
1246  * a process at the time of a crash.  We walk the list and try to delete these
1247  * inodes at recovery time (only with a read-write filesystem).
1248  *
1249  * In order to keep the orphan inode chain consistent during traversal (in
1250  * case of crash during recovery), we link each inode into the superblock
1251  * orphan list_head and handle it the same way as an inode deletion during
1252  * normal operation (which journals the operations for us).
1253  *
1254  * We only do an iget() and an iput() on each inode, which is very safe if we
1255  * accidentally point at an in-use or already deleted inode.  The worst that
1256  * can happen in this case is that we get a "bit already cleared" message from
1257  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1258  * e2fsck was run on this filesystem, and it must have already done the orphan
1259  * inode cleanup for us, so we can safely abort without any further action.
1260  */
1261 static void ext3_orphan_cleanup (struct super_block * sb,
1262                                  struct ext3_super_block * es)
1263 {
1264         unsigned int s_flags = sb->s_flags;
1265         int nr_orphans = 0, nr_truncates = 0;
1266 #ifdef CONFIG_QUOTA
1267         int i;
1268 #endif
1269         if (!es->s_last_orphan) {
1270                 jbd_debug(4, "no orphan inodes to clean up\n");
1271                 return;
1272         }
1273
1274         if (bdev_read_only(sb->s_bdev)) {
1275                 printk(KERN_ERR "EXT3-fs: write access "
1276                         "unavailable, skipping orphan cleanup.\n");
1277                 return;
1278         }
1279
1280         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1281                 if (es->s_last_orphan)
1282                         jbd_debug(1, "Errors on filesystem, "
1283                                   "clearing orphan list.\n");
1284                 es->s_last_orphan = 0;
1285                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1286                 return;
1287         }
1288
1289         if (s_flags & MS_RDONLY) {
1290                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1291                        sb->s_id);
1292                 sb->s_flags &= ~MS_RDONLY;
1293         }
1294 #ifdef CONFIG_QUOTA
1295         /* Needed for iput() to work correctly and not trash data */
1296         sb->s_flags |= MS_ACTIVE;
1297         /* Turn on quotas so that they are updated correctly */
1298         for (i = 0; i < MAXQUOTAS; i++) {
1299                 if (EXT3_SB(sb)->s_qf_names[i]) {
1300                         int ret = ext3_quota_on_mount(sb, i);
1301                         if (ret < 0)
1302                                 printk(KERN_ERR
1303                                         "EXT3-fs: Cannot turn on journalled "
1304                                         "quota: error %d\n", ret);
1305                 }
1306         }
1307 #endif
1308
1309         while (es->s_last_orphan) {
1310                 struct inode *inode;
1311
1312                 if (!(inode =
1313                       ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1314                         es->s_last_orphan = 0;
1315                         break;
1316                 }
1317
1318                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1319                 DQUOT_INIT(inode);
1320                 if (inode->i_nlink) {
1321                         printk(KERN_DEBUG
1322                                 "%s: truncating inode %lu to %Ld bytes\n",
1323                                 __FUNCTION__, inode->i_ino, inode->i_size);
1324                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1325                                   inode->i_ino, inode->i_size);
1326                         ext3_truncate(inode);
1327                         nr_truncates++;
1328                 } else {
1329                         printk(KERN_DEBUG
1330                                 "%s: deleting unreferenced inode %lu\n",
1331                                 __FUNCTION__, inode->i_ino);
1332                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1333                                   inode->i_ino);
1334                         nr_orphans++;
1335                 }
1336                 iput(inode);  /* The delete magic happens here! */
1337         }
1338
1339 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1340
1341         if (nr_orphans)
1342                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1343                        sb->s_id, PLURAL(nr_orphans));
1344         if (nr_truncates)
1345                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1346                        sb->s_id, PLURAL(nr_truncates));
1347 #ifdef CONFIG_QUOTA
1348         /* Turn quotas off */
1349         for (i = 0; i < MAXQUOTAS; i++) {
1350                 if (sb_dqopt(sb)->files[i])
1351                         vfs_quota_off(sb, i);
1352         }
1353 #endif
1354         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1355 }
1356
1357 /*
1358  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1359  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1360  * We need to be 1 filesystem block less than the 2^32 sector limit.
1361  */
1362 static loff_t ext3_max_size(int bits)
1363 {
1364         loff_t res = EXT3_NDIR_BLOCKS;
1365         /* This constant is calculated to be the largest file size for a
1366          * dense, 4k-blocksize file such that the total number of
1367          * sectors in the file, including data and all indirect blocks,
1368          * does not exceed 2^32. */
1369         const loff_t upper_limit = 0x1ff7fffd000LL;
1370
1371         res += 1LL << (bits-2);
1372         res += 1LL << (2*(bits-2));
1373         res += 1LL << (3*(bits-2));
1374         res <<= bits;
1375         if (res > upper_limit)
1376                 res = upper_limit;
1377         return res;
1378 }
1379
1380 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1381                                     ext3_fsblk_t logic_sb_block,
1382                                     int nr)
1383 {
1384         struct ext3_sb_info *sbi = EXT3_SB(sb);
1385         unsigned long bg, first_meta_bg;
1386         int has_super = 0;
1387
1388         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1389
1390         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1391             nr < first_meta_bg)
1392                 return (logic_sb_block + nr + 1);
1393         bg = sbi->s_desc_per_block * nr;
1394         if (ext3_bg_has_super(sb, bg))
1395                 has_super = 1;
1396         return (has_super + ext3_group_first_block_no(sb, bg));
1397 }
1398
1399
1400 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1401 {
1402         struct buffer_head * bh;
1403         struct ext3_super_block *es = NULL;
1404         struct ext3_sb_info *sbi;
1405         ext3_fsblk_t block;
1406         ext3_fsblk_t sb_block = get_sb_block(&data);
1407         ext3_fsblk_t logic_sb_block;
1408         unsigned long offset = 0;
1409         unsigned int journal_inum = 0;
1410         unsigned long journal_devnum = 0;
1411         unsigned long def_mount_opts;
1412         struct inode *root;
1413         int blocksize;
1414         int hblock;
1415         int db_count;
1416         int i;
1417         int needs_recovery;
1418         __le32 features;
1419
1420         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1421         if (!sbi)
1422                 return -ENOMEM;
1423         sb->s_fs_info = sbi;
1424         sbi->s_mount_opt = 0;
1425         sbi->s_resuid = EXT3_DEF_RESUID;
1426         sbi->s_resgid = EXT3_DEF_RESGID;
1427
1428         unlock_kernel();
1429
1430         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1431         if (!blocksize) {
1432                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1433                 goto out_fail;
1434         }
1435
1436         /*
1437          * The ext3 superblock will not be buffer aligned for other than 1kB
1438          * block sizes.  We need to calculate the offset from buffer start.
1439          */
1440         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1441                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1442                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1443         } else {
1444                 logic_sb_block = sb_block;
1445         }
1446
1447         if (!(bh = sb_bread(sb, logic_sb_block))) {
1448                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1449                 goto out_fail;
1450         }
1451         /*
1452          * Note: s_es must be initialized as soon as possible because
1453          *       some ext3 macro-instructions depend on its value
1454          */
1455         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1456         sbi->s_es = es;
1457         sb->s_magic = le16_to_cpu(es->s_magic);
1458         if (sb->s_magic != EXT3_SUPER_MAGIC)
1459                 goto cantfind_ext3;
1460
1461         /* Set defaults before we parse the mount options */
1462         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1463         if (def_mount_opts & EXT3_DEFM_DEBUG)
1464                 set_opt(sbi->s_mount_opt, DEBUG);
1465         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1466                 set_opt(sbi->s_mount_opt, GRPID);
1467         if (def_mount_opts & EXT3_DEFM_UID16)
1468                 set_opt(sbi->s_mount_opt, NO_UID32);
1469 #ifdef CONFIG_EXT3_FS_XATTR
1470         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1471                 set_opt(sbi->s_mount_opt, XATTR_USER);
1472 #endif
1473 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1474         if (def_mount_opts & EXT3_DEFM_ACL)
1475                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1476 #endif
1477         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1478                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1479         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1480                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1481         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1482                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1483
1484         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1485                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1486         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1487                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1488         else
1489                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1490
1491         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1492         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1493
1494         set_opt(sbi->s_mount_opt, RESERVATION);
1495
1496         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1497                             NULL, 0))
1498                 goto failed_mount;
1499
1500         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1501                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1502
1503         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1504             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1505              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1506              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1507                 printk(KERN_WARNING
1508                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1509                        "running e2fsck is recommended\n");
1510         /*
1511          * Check feature flags regardless of the revision level, since we
1512          * previously didn't change the revision level when setting the flags,
1513          * so there is a chance incompat flags are set on a rev 0 filesystem.
1514          */
1515         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1516         if (features) {
1517                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1518                        "unsupported optional features (%x).\n",
1519                        sb->s_id, le32_to_cpu(features));
1520                 goto failed_mount;
1521         }
1522         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1523         if (!(sb->s_flags & MS_RDONLY) && features) {
1524                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1525                        "unsupported optional features (%x).\n",
1526                        sb->s_id, le32_to_cpu(features));
1527                 goto failed_mount;
1528         }
1529         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1530
1531         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1532             blocksize > EXT3_MAX_BLOCK_SIZE) {
1533                 printk(KERN_ERR
1534                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1535                        blocksize, sb->s_id);
1536                 goto failed_mount;
1537         }
1538
1539         hblock = bdev_hardsect_size(sb->s_bdev);
1540         if (sb->s_blocksize != blocksize) {
1541                 /*
1542                  * Make sure the blocksize for the filesystem is larger
1543                  * than the hardware sectorsize for the machine.
1544                  */
1545                 if (blocksize < hblock) {
1546                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1547                                "device blocksize %d.\n", blocksize, hblock);
1548                         goto failed_mount;
1549                 }
1550
1551                 brelse (bh);
1552                 sb_set_blocksize(sb, blocksize);
1553                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1554                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1555                 bh = sb_bread(sb, logic_sb_block);
1556                 if (!bh) {
1557                         printk(KERN_ERR
1558                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1559                         goto failed_mount;
1560                 }
1561                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1562                 sbi->s_es = es;
1563                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1564                         printk (KERN_ERR
1565                                 "EXT3-fs: Magic mismatch, very weird !\n");
1566                         goto failed_mount;
1567                 }
1568         }
1569
1570         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1571
1572         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1573                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1574                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1575         } else {
1576                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1577                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1578                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1579                     (!is_power_of_2(sbi->s_inode_size)) ||
1580                     (sbi->s_inode_size > blocksize)) {
1581                         printk (KERN_ERR
1582                                 "EXT3-fs: unsupported inode size: %d\n",
1583                                 sbi->s_inode_size);
1584                         goto failed_mount;
1585                 }
1586         }
1587         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1588                                    le32_to_cpu(es->s_log_frag_size);
1589         if (blocksize != sbi->s_frag_size) {
1590                 printk(KERN_ERR
1591                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1592                        sbi->s_frag_size, blocksize);
1593                 goto failed_mount;
1594         }
1595         sbi->s_frags_per_block = 1;
1596         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1597         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1598         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1599         if (EXT3_INODE_SIZE(sb) == 0)
1600                 goto cantfind_ext3;
1601         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1602         if (sbi->s_inodes_per_block == 0)
1603                 goto cantfind_ext3;
1604         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1605                                         sbi->s_inodes_per_block;
1606         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1607         sbi->s_sbh = bh;
1608         sbi->s_mount_state = le16_to_cpu(es->s_state);
1609         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1610         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1611         for (i=0; i < 4; i++)
1612                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1613         sbi->s_def_hash_version = es->s_def_hash_version;
1614
1615         if (sbi->s_blocks_per_group > blocksize * 8) {
1616                 printk (KERN_ERR
1617                         "EXT3-fs: #blocks per group too big: %lu\n",
1618                         sbi->s_blocks_per_group);
1619                 goto failed_mount;
1620         }
1621         if (sbi->s_frags_per_group > blocksize * 8) {
1622                 printk (KERN_ERR
1623                         "EXT3-fs: #fragments per group too big: %lu\n",
1624                         sbi->s_frags_per_group);
1625                 goto failed_mount;
1626         }
1627         if (sbi->s_inodes_per_group > blocksize * 8) {
1628                 printk (KERN_ERR
1629                         "EXT3-fs: #inodes per group too big: %lu\n",
1630                         sbi->s_inodes_per_group);
1631                 goto failed_mount;
1632         }
1633
1634         if (le32_to_cpu(es->s_blocks_count) >
1635                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1636                 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1637                         " too large to mount safely\n", sb->s_id);
1638                 if (sizeof(sector_t) < 8)
1639                         printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1640                                         "enabled\n");
1641                 goto failed_mount;
1642         }
1643
1644         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1645                 goto cantfind_ext3;
1646         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1647                                le32_to_cpu(es->s_first_data_block) - 1)
1648                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1649         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1650                    EXT3_DESC_PER_BLOCK(sb);
1651         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1652                                     GFP_KERNEL);
1653         if (sbi->s_group_desc == NULL) {
1654                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1655                 goto failed_mount;
1656         }
1657
1658         bgl_lock_init(&sbi->s_blockgroup_lock);
1659
1660         for (i = 0; i < db_count; i++) {
1661                 block = descriptor_loc(sb, logic_sb_block, i);
1662                 sbi->s_group_desc[i] = sb_bread(sb, block);
1663                 if (!sbi->s_group_desc[i]) {
1664                         printk (KERN_ERR "EXT3-fs: "
1665                                 "can't read group descriptor %d\n", i);
1666                         db_count = i;
1667                         goto failed_mount2;
1668                 }
1669         }
1670         if (!ext3_check_descriptors (sb)) {
1671                 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1672                 goto failed_mount2;
1673         }
1674         sbi->s_gdb_count = db_count;
1675         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1676         spin_lock_init(&sbi->s_next_gen_lock);
1677
1678         percpu_counter_init(&sbi->s_freeblocks_counter,
1679                 ext3_count_free_blocks(sb));
1680         percpu_counter_init(&sbi->s_freeinodes_counter,
1681                 ext3_count_free_inodes(sb));
1682         percpu_counter_init(&sbi->s_dirs_counter,
1683                 ext3_count_dirs(sb));
1684
1685         /* per fileystem reservation list head & lock */
1686         spin_lock_init(&sbi->s_rsv_window_lock);
1687         sbi->s_rsv_window_root = RB_ROOT;
1688         /* Add a single, static dummy reservation to the start of the
1689          * reservation window list --- it gives us a placeholder for
1690          * append-at-start-of-list which makes the allocation logic
1691          * _much_ simpler. */
1692         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1693         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1694         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1695         sbi->s_rsv_window_head.rsv_goal_size = 0;
1696         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1697
1698         /*
1699          * set up enough so that it can read an inode
1700          */
1701         sb->s_op = &ext3_sops;
1702         sb->s_export_op = &ext3_export_ops;
1703         sb->s_xattr = ext3_xattr_handlers;
1704 #ifdef CONFIG_QUOTA
1705         sb->s_qcop = &ext3_qctl_operations;
1706         sb->dq_op = &ext3_quota_operations;
1707 #endif
1708         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1709
1710         sb->s_root = NULL;
1711
1712         needs_recovery = (es->s_last_orphan != 0 ||
1713                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1714                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1715
1716         /*
1717          * The first inode we look at is the journal inode.  Don't try
1718          * root first: it may be modified in the journal!
1719          */
1720         if (!test_opt(sb, NOLOAD) &&
1721             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1722                 if (ext3_load_journal(sb, es, journal_devnum))
1723                         goto failed_mount3;
1724         } else if (journal_inum) {
1725                 if (ext3_create_journal(sb, es, journal_inum))
1726                         goto failed_mount3;
1727         } else {
1728                 if (!silent)
1729                         printk (KERN_ERR
1730                                 "ext3: No journal on filesystem on %s\n",
1731                                 sb->s_id);
1732                 goto failed_mount3;
1733         }
1734
1735         /* We have now updated the journal if required, so we can
1736          * validate the data journaling mode. */
1737         switch (test_opt(sb, DATA_FLAGS)) {
1738         case 0:
1739                 /* No mode set, assume a default based on the journal
1740                    capabilities: ORDERED_DATA if the journal can
1741                    cope, else JOURNAL_DATA */
1742                 if (journal_check_available_features
1743                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1744                         set_opt(sbi->s_mount_opt, ORDERED_DATA);
1745                 else
1746                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1747                 break;
1748
1749         case EXT3_MOUNT_ORDERED_DATA:
1750         case EXT3_MOUNT_WRITEBACK_DATA:
1751                 if (!journal_check_available_features
1752                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1753                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1754                                "requested data journaling mode\n");
1755                         goto failed_mount4;
1756                 }
1757         default:
1758                 break;
1759         }
1760
1761         if (test_opt(sb, NOBH)) {
1762                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1763                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1764                                 "its supported only with writeback mode\n");
1765                         clear_opt(sbi->s_mount_opt, NOBH);
1766                 }
1767         }
1768         /*
1769          * The journal_load will have done any necessary log recovery,
1770          * so we can safely mount the rest of the filesystem now.
1771          */
1772
1773         root = iget(sb, EXT3_ROOT_INO);
1774         sb->s_root = d_alloc_root(root);
1775         if (!sb->s_root) {
1776                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1777                 iput(root);
1778                 goto failed_mount4;
1779         }
1780         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1781                 dput(sb->s_root);
1782                 sb->s_root = NULL;
1783                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1784                 goto failed_mount4;
1785         }
1786
1787         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1788         /*
1789          * akpm: core read_super() calls in here with the superblock locked.
1790          * That deadlocks, because orphan cleanup needs to lock the superblock
1791          * in numerous places.  Here we just pop the lock - it's relatively
1792          * harmless, because we are now ready to accept write_super() requests,
1793          * and aviro says that's the only reason for hanging onto the
1794          * superblock lock.
1795          */
1796         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1797         ext3_orphan_cleanup(sb, es);
1798         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1799         if (needs_recovery)
1800                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1801         ext3_mark_recovery_complete(sb, es);
1802         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1803                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1804                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1805                 "writeback");
1806
1807         lock_kernel();
1808         return 0;
1809
1810 cantfind_ext3:
1811         if (!silent)
1812                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1813                        sb->s_id);
1814         goto failed_mount;
1815
1816 failed_mount4:
1817         journal_destroy(sbi->s_journal);
1818 failed_mount3:
1819         percpu_counter_destroy(&sbi->s_freeblocks_counter);
1820         percpu_counter_destroy(&sbi->s_freeinodes_counter);
1821         percpu_counter_destroy(&sbi->s_dirs_counter);
1822 failed_mount2:
1823         for (i = 0; i < db_count; i++)
1824                 brelse(sbi->s_group_desc[i]);
1825         kfree(sbi->s_group_desc);
1826 failed_mount:
1827 #ifdef CONFIG_QUOTA
1828         for (i = 0; i < MAXQUOTAS; i++)
1829                 kfree(sbi->s_qf_names[i]);
1830 #endif
1831         ext3_blkdev_remove(sbi);
1832         brelse(bh);
1833 out_fail:
1834         sb->s_fs_info = NULL;
1835         kfree(sbi);
1836         lock_kernel();
1837         return -EINVAL;
1838 }
1839
1840 /*
1841  * Setup any per-fs journal parameters now.  We'll do this both on
1842  * initial mount, once the journal has been initialised but before we've
1843  * done any recovery; and again on any subsequent remount.
1844  */
1845 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1846 {
1847         struct ext3_sb_info *sbi = EXT3_SB(sb);
1848
1849         if (sbi->s_commit_interval)
1850                 journal->j_commit_interval = sbi->s_commit_interval;
1851         /* We could also set up an ext3-specific default for the commit
1852          * interval here, but for now we'll just fall back to the jbd
1853          * default. */
1854
1855         spin_lock(&journal->j_state_lock);
1856         if (test_opt(sb, BARRIER))
1857                 journal->j_flags |= JFS_BARRIER;
1858         else
1859                 journal->j_flags &= ~JFS_BARRIER;
1860         spin_unlock(&journal->j_state_lock);
1861 }
1862
1863 static journal_t *ext3_get_journal(struct super_block *sb,
1864                                    unsigned int journal_inum)
1865 {
1866         struct inode *journal_inode;
1867         journal_t *journal;
1868
1869         /* First, test for the existence of a valid inode on disk.  Bad
1870          * things happen if we iget() an unused inode, as the subsequent
1871          * iput() will try to delete it. */
1872
1873         journal_inode = iget(sb, journal_inum);
1874         if (!journal_inode) {
1875                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1876                 return NULL;
1877         }
1878         if (!journal_inode->i_nlink) {
1879                 make_bad_inode(journal_inode);
1880                 iput(journal_inode);
1881                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1882                 return NULL;
1883         }
1884
1885         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1886                   journal_inode, journal_inode->i_size);
1887         if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1888                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1889                 iput(journal_inode);
1890                 return NULL;
1891         }
1892
1893         journal = journal_init_inode(journal_inode);
1894         if (!journal) {
1895                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1896                 iput(journal_inode);
1897                 return NULL;
1898         }
1899         journal->j_private = sb;
1900         ext3_init_journal_params(sb, journal);
1901         return journal;
1902 }
1903
1904 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1905                                        dev_t j_dev)
1906 {
1907         struct buffer_head * bh;
1908         journal_t *journal;
1909         ext3_fsblk_t start;
1910         ext3_fsblk_t len;
1911         int hblock, blocksize;
1912         ext3_fsblk_t sb_block;
1913         unsigned long offset;
1914         struct ext3_super_block * es;
1915         struct block_device *bdev;
1916
1917         bdev = ext3_blkdev_get(j_dev);
1918         if (bdev == NULL)
1919                 return NULL;
1920
1921         if (bd_claim(bdev, sb)) {
1922                 printk(KERN_ERR
1923                         "EXT3: failed to claim external journal device.\n");
1924                 blkdev_put(bdev);
1925                 return NULL;
1926         }
1927
1928         blocksize = sb->s_blocksize;
1929         hblock = bdev_hardsect_size(bdev);
1930         if (blocksize < hblock) {
1931                 printk(KERN_ERR
1932                         "EXT3-fs: blocksize too small for journal device.\n");
1933                 goto out_bdev;
1934         }
1935
1936         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1937         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1938         set_blocksize(bdev, blocksize);
1939         if (!(bh = __bread(bdev, sb_block, blocksize))) {
1940                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1941                        "external journal\n");
1942                 goto out_bdev;
1943         }
1944
1945         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1946         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1947             !(le32_to_cpu(es->s_feature_incompat) &
1948               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1949                 printk(KERN_ERR "EXT3-fs: external journal has "
1950                                         "bad superblock\n");
1951                 brelse(bh);
1952                 goto out_bdev;
1953         }
1954
1955         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1956                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1957                 brelse(bh);
1958                 goto out_bdev;
1959         }
1960
1961         len = le32_to_cpu(es->s_blocks_count);
1962         start = sb_block + 1;
1963         brelse(bh);     /* we're done with the superblock */
1964
1965         journal = journal_init_dev(bdev, sb->s_bdev,
1966                                         start, len, blocksize);
1967         if (!journal) {
1968                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1969                 goto out_bdev;
1970         }
1971         journal->j_private = sb;
1972         ll_rw_block(READ, 1, &journal->j_sb_buffer);
1973         wait_on_buffer(journal->j_sb_buffer);
1974         if (!buffer_uptodate(journal->j_sb_buffer)) {
1975                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1976                 goto out_journal;
1977         }
1978         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1979                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1980                                         "user (unsupported) - %d\n",
1981                         be32_to_cpu(journal->j_superblock->s_nr_users));
1982                 goto out_journal;
1983         }
1984         EXT3_SB(sb)->journal_bdev = bdev;
1985         ext3_init_journal_params(sb, journal);
1986         return journal;
1987 out_journal:
1988         journal_destroy(journal);
1989 out_bdev:
1990         ext3_blkdev_put(bdev);
1991         return NULL;
1992 }
1993
1994 static int ext3_load_journal(struct super_block *sb,
1995                              struct ext3_super_block *es,
1996                              unsigned long journal_devnum)
1997 {
1998         journal_t *journal;
1999         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2000         dev_t journal_dev;
2001         int err = 0;
2002         int really_read_only;
2003
2004         if (journal_devnum &&
2005             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2006                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2007                         "numbers have changed\n");
2008                 journal_dev = new_decode_dev(journal_devnum);
2009         } else
2010                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2011
2012         really_read_only = bdev_read_only(sb->s_bdev);
2013
2014         /*
2015          * Are we loading a blank journal or performing recovery after a
2016          * crash?  For recovery, we need to check in advance whether we
2017          * can get read-write access to the device.
2018          */
2019
2020         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2021                 if (sb->s_flags & MS_RDONLY) {
2022                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
2023                                         "required on readonly filesystem.\n");
2024                         if (really_read_only) {
2025                                 printk(KERN_ERR "EXT3-fs: write access "
2026                                         "unavailable, cannot proceed.\n");
2027                                 return -EROFS;
2028                         }
2029                         printk (KERN_INFO "EXT3-fs: write access will "
2030                                         "be enabled during recovery.\n");
2031                 }
2032         }
2033
2034         if (journal_inum && journal_dev) {
2035                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2036                        "and inode journals!\n");
2037                 return -EINVAL;
2038         }
2039
2040         if (journal_inum) {
2041                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2042                         return -EINVAL;
2043         } else {
2044                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2045                         return -EINVAL;
2046         }
2047
2048         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2049                 err = journal_update_format(journal);
2050                 if (err)  {
2051                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2052                         journal_destroy(journal);
2053                         return err;
2054                 }
2055         }
2056
2057         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2058                 err = journal_wipe(journal, !really_read_only);
2059         if (!err)
2060                 err = journal_load(journal);
2061
2062         if (err) {
2063                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2064                 journal_destroy(journal);
2065                 return err;
2066         }
2067
2068         EXT3_SB(sb)->s_journal = journal;
2069         ext3_clear_journal_err(sb, es);
2070
2071         if (journal_devnum &&
2072             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2073                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2074                 sb->s_dirt = 1;
2075
2076                 /* Make sure we flush the recovery flag to disk. */
2077                 ext3_commit_super(sb, es, 1);
2078         }
2079
2080         return 0;
2081 }
2082
2083 static int ext3_create_journal(struct super_block * sb,
2084                                struct ext3_super_block * es,
2085                                unsigned int journal_inum)
2086 {
2087         journal_t *journal;
2088         int err;
2089
2090         if (sb->s_flags & MS_RDONLY) {
2091                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2092                                 "create journal.\n");
2093                 return -EROFS;
2094         }
2095
2096         journal = ext3_get_journal(sb, journal_inum);
2097         if (!journal)
2098                 return -EINVAL;
2099
2100         printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2101                journal_inum);
2102
2103         err = journal_create(journal);
2104         if (err) {
2105                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2106                 journal_destroy(journal);
2107                 return -EIO;
2108         }
2109
2110         EXT3_SB(sb)->s_journal = journal;
2111
2112         ext3_update_dynamic_rev(sb);
2113         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2114         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2115
2116         es->s_journal_inum = cpu_to_le32(journal_inum);
2117         sb->s_dirt = 1;
2118
2119         /* Make sure we flush the recovery flag to disk. */
2120         ext3_commit_super(sb, es, 1);
2121
2122         return 0;
2123 }
2124
2125 static void ext3_commit_super (struct super_block * sb,
2126                                struct ext3_super_block * es,
2127                                int sync)
2128 {
2129         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2130
2131         if (!sbh)
2132                 return;
2133         es->s_wtime = cpu_to_le32(get_seconds());
2134         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2135         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2136         BUFFER_TRACE(sbh, "marking dirty");
2137         mark_buffer_dirty(sbh);
2138         if (sync)
2139                 sync_dirty_buffer(sbh);
2140 }
2141
2142
2143 /*
2144  * Have we just finished recovery?  If so, and if we are mounting (or
2145  * remounting) the filesystem readonly, then we will end up with a
2146  * consistent fs on disk.  Record that fact.
2147  */
2148 static void ext3_mark_recovery_complete(struct super_block * sb,
2149                                         struct ext3_super_block * es)
2150 {
2151         journal_t *journal = EXT3_SB(sb)->s_journal;
2152
2153         journal_lock_updates(journal);
2154         journal_flush(journal);
2155         lock_super(sb);
2156         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2157             sb->s_flags & MS_RDONLY) {
2158                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2159                 sb->s_dirt = 0;
2160                 ext3_commit_super(sb, es, 1);
2161         }
2162         unlock_super(sb);
2163         journal_unlock_updates(journal);
2164 }
2165
2166 /*
2167  * If we are mounting (or read-write remounting) a filesystem whose journal
2168  * has recorded an error from a previous lifetime, move that error to the
2169  * main filesystem now.
2170  */
2171 static void ext3_clear_journal_err(struct super_block * sb,
2172                                    struct ext3_super_block * es)
2173 {
2174         journal_t *journal;
2175         int j_errno;
2176         const char *errstr;
2177
2178         journal = EXT3_SB(sb)->s_journal;
2179
2180         /*
2181          * Now check for any error status which may have been recorded in the
2182          * journal by a prior ext3_error() or ext3_abort()
2183          */
2184
2185         j_errno = journal_errno(journal);
2186         if (j_errno) {
2187                 char nbuf[16];
2188
2189                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2190                 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2191                              "from previous mount: %s", errstr);
2192                 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2193                              "filesystem check.");
2194
2195                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2196                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2197                 ext3_commit_super (sb, es, 1);
2198
2199                 journal_clear_err(journal);
2200         }
2201 }
2202
2203 /*
2204  * Force the running and committing transactions to commit,
2205  * and wait on the commit.
2206  */
2207 int ext3_force_commit(struct super_block *sb)
2208 {
2209         journal_t *journal;
2210         int ret;
2211
2212         if (sb->s_flags & MS_RDONLY)
2213                 return 0;
2214
2215         journal = EXT3_SB(sb)->s_journal;
2216         sb->s_dirt = 0;
2217         ret = ext3_journal_force_commit(journal);
2218         return ret;
2219 }
2220
2221 /*
2222  * Ext3 always journals updates to the superblock itself, so we don't
2223  * have to propagate any other updates to the superblock on disk at this
2224  * point.  Just start an async writeback to get the buffers on their way
2225  * to the disk.
2226  *
2227  * This implicitly triggers the writebehind on sync().
2228  */
2229
2230 static void ext3_write_super (struct super_block * sb)
2231 {
2232         if (mutex_trylock(&sb->s_lock) != 0)
2233                 BUG();
2234         sb->s_dirt = 0;
2235 }
2236
2237 static int ext3_sync_fs(struct super_block *sb, int wait)
2238 {
2239         tid_t target;
2240
2241         sb->s_dirt = 0;
2242         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2243                 if (wait)
2244                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2245         }
2246         return 0;
2247 }
2248
2249 /*
2250  * LVM calls this function before a (read-only) snapshot is created.  This
2251  * gives us a chance to flush the journal completely and mark the fs clean.
2252  */
2253 static void ext3_write_super_lockfs(struct super_block *sb)
2254 {
2255         sb->s_dirt = 0;
2256
2257         if (!(sb->s_flags & MS_RDONLY)) {
2258                 journal_t *journal = EXT3_SB(sb)->s_journal;
2259
2260                 /* Now we set up the journal barrier. */
2261                 journal_lock_updates(journal);
2262                 journal_flush(journal);
2263
2264                 /* Journal blocked and flushed, clear needs_recovery flag. */
2265                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2266                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2267         }
2268 }
2269
2270 /*
2271  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2272  * flag here, even though the filesystem is not technically dirty yet.
2273  */
2274 static void ext3_unlockfs(struct super_block *sb)
2275 {
2276         if (!(sb->s_flags & MS_RDONLY)) {
2277                 lock_super(sb);
2278                 /* Reser the needs_recovery flag before the fs is unlocked. */
2279                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2280                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2281                 unlock_super(sb);
2282                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2283         }
2284 }
2285
2286 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2287 {
2288         struct ext3_super_block * es;
2289         struct ext3_sb_info *sbi = EXT3_SB(sb);
2290         ext3_fsblk_t n_blocks_count = 0;
2291         unsigned long old_sb_flags;
2292         struct ext3_mount_options old_opts;
2293         int err;
2294 #ifdef CONFIG_QUOTA
2295         int i;
2296 #endif
2297
2298         /* Store the original options */
2299         old_sb_flags = sb->s_flags;
2300         old_opts.s_mount_opt = sbi->s_mount_opt;
2301         old_opts.s_resuid = sbi->s_resuid;
2302         old_opts.s_resgid = sbi->s_resgid;
2303         old_opts.s_commit_interval = sbi->s_commit_interval;
2304 #ifdef CONFIG_QUOTA
2305         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2306         for (i = 0; i < MAXQUOTAS; i++)
2307                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2308 #endif
2309
2310         /*
2311          * Allow the "check" option to be passed as a remount option.
2312          */
2313         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2314                 err = -EINVAL;
2315                 goto restore_opts;
2316         }
2317
2318         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2319                 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2320
2321         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2322                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2323
2324         es = sbi->s_es;
2325
2326         ext3_init_journal_params(sb, sbi->s_journal);
2327
2328         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2329                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2330                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2331                         err = -EROFS;
2332                         goto restore_opts;
2333                 }
2334
2335                 if (*flags & MS_RDONLY) {
2336                         /*
2337                          * First of all, the unconditional stuff we have to do
2338                          * to disable replay of the journal when we next remount
2339                          */
2340                         sb->s_flags |= MS_RDONLY;
2341
2342                         /*
2343                          * OK, test if we are remounting a valid rw partition
2344                          * readonly, and if so set the rdonly flag and then
2345                          * mark the partition as valid again.
2346                          */
2347                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2348                             (sbi->s_mount_state & EXT3_VALID_FS))
2349                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2350
2351                         /*
2352                          * We have to unlock super so that we can wait for
2353                          * transactions.
2354                          */
2355                         unlock_super(sb);
2356                         ext3_mark_recovery_complete(sb, es);
2357                         lock_super(sb);
2358                 } else {
2359                         __le32 ret;
2360                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2361                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2362                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2363                                        "remount RDWR because of unsupported "
2364                                        "optional features (%x).\n",
2365                                        sb->s_id, le32_to_cpu(ret));
2366                                 err = -EROFS;
2367                                 goto restore_opts;
2368                         }
2369
2370                         /*
2371                          * If we have an unprocessed orphan list hanging
2372                          * around from a previously readonly bdev mount,
2373                          * require a full umount/remount for now.
2374                          */
2375                         if (es->s_last_orphan) {
2376                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2377                                        "remount RDWR because of unprocessed "
2378                                        "orphan inode list.  Please "
2379                                        "umount/remount instead.\n",
2380                                        sb->s_id);
2381                                 err = -EINVAL;
2382                                 goto restore_opts;
2383                         }
2384
2385                         /*
2386                          * Mounting a RDONLY partition read-write, so reread
2387                          * and store the current valid flag.  (It may have
2388                          * been changed by e2fsck since we originally mounted
2389                          * the partition.)
2390                          */
2391                         ext3_clear_journal_err(sb, es);
2392                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2393                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2394                                 goto restore_opts;
2395                         if (!ext3_setup_super (sb, es, 0))
2396                                 sb->s_flags &= ~MS_RDONLY;
2397                 }
2398         }
2399 #ifdef CONFIG_QUOTA
2400         /* Release old quota file names */
2401         for (i = 0; i < MAXQUOTAS; i++)
2402                 if (old_opts.s_qf_names[i] &&
2403                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2404                         kfree(old_opts.s_qf_names[i]);
2405 #endif
2406         return 0;
2407 restore_opts:
2408         sb->s_flags = old_sb_flags;
2409         sbi->s_mount_opt = old_opts.s_mount_opt;
2410         sbi->s_resuid = old_opts.s_resuid;
2411         sbi->s_resgid = old_opts.s_resgid;
2412         sbi->s_commit_interval = old_opts.s_commit_interval;
2413 #ifdef CONFIG_QUOTA
2414         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2415         for (i = 0; i < MAXQUOTAS; i++) {
2416                 if (sbi->s_qf_names[i] &&
2417                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2418                         kfree(sbi->s_qf_names[i]);
2419                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2420         }
2421 #endif
2422         return err;
2423 }
2424
2425 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2426 {
2427         struct super_block *sb = dentry->d_sb;
2428         struct ext3_sb_info *sbi = EXT3_SB(sb);
2429         struct ext3_super_block *es = sbi->s_es;
2430         u64 fsid;
2431
2432         if (test_opt(sb, MINIX_DF)) {
2433                 sbi->s_overhead_last = 0;
2434         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2435                 unsigned long ngroups = sbi->s_groups_count, i;
2436                 ext3_fsblk_t overhead = 0;
2437                 smp_rmb();
2438
2439                 /*
2440                  * Compute the overhead (FS structures).  This is constant
2441                  * for a given filesystem unless the number of block groups
2442                  * changes so we cache the previous value until it does.
2443                  */
2444
2445                 /*
2446                  * All of the blocks before first_data_block are
2447                  * overhead
2448                  */
2449                 overhead = le32_to_cpu(es->s_first_data_block);
2450
2451                 /*
2452                  * Add the overhead attributed to the superblock and
2453                  * block group descriptors.  If the sparse superblocks
2454                  * feature is turned on, then not all groups have this.
2455                  */
2456                 for (i = 0; i < ngroups; i++) {
2457                         overhead += ext3_bg_has_super(sb, i) +
2458                                 ext3_bg_num_gdb(sb, i);
2459                         cond_resched();
2460                 }
2461
2462                 /*
2463                  * Every block group has an inode bitmap, a block
2464                  * bitmap, and an inode table.
2465                  */
2466                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2467                 sbi->s_overhead_last = overhead;
2468                 smp_wmb();
2469                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2470         }
2471
2472         buf->f_type = EXT3_SUPER_MAGIC;
2473         buf->f_bsize = sb->s_blocksize;
2474         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2475         buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
2476         es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2477         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2478         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2479                 buf->f_bavail = 0;
2480         buf->f_files = le32_to_cpu(es->s_inodes_count);
2481         buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
2482         es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2483         buf->f_namelen = EXT3_NAME_LEN;
2484         fsid = le64_to_cpup((void *)es->s_uuid) ^
2485                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2486         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2487         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2488         return 0;
2489 }
2490
2491 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2492  * is locked for write. Otherwise the are possible deadlocks:
2493  * Process 1                         Process 2
2494  * ext3_create()                     quota_sync()
2495  *   journal_start()                   write_dquot()
2496  *   DQUOT_INIT()                        down(dqio_mutex)
2497  *     down(dqio_mutex)                    journal_start()
2498  *
2499  */
2500
2501 #ifdef CONFIG_QUOTA
2502
2503 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2504 {
2505         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2506 }
2507
2508 static int ext3_dquot_initialize(struct inode *inode, int type)
2509 {
2510         handle_t *handle;
2511         int ret, err;
2512
2513         /* We may create quota structure so we need to reserve enough blocks */
2514         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2515         if (IS_ERR(handle))
2516                 return PTR_ERR(handle);
2517         ret = dquot_initialize(inode, type);
2518         err = ext3_journal_stop(handle);
2519         if (!ret)
2520                 ret = err;
2521         return ret;
2522 }
2523
2524 static int ext3_dquot_drop(struct inode *inode)
2525 {
2526         handle_t *handle;
2527         int ret, err;
2528
2529         /* We may delete quota structure so we need to reserve enough blocks */
2530         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2531         if (IS_ERR(handle))
2532                 return PTR_ERR(handle);
2533         ret = dquot_drop(inode);
2534         err = ext3_journal_stop(handle);
2535         if (!ret)
2536                 ret = err;
2537         return ret;
2538 }
2539
2540 static int ext3_write_dquot(struct dquot *dquot)
2541 {
2542         int ret, err;
2543         handle_t *handle;
2544         struct inode *inode;
2545
2546         inode = dquot_to_inode(dquot);
2547         handle = ext3_journal_start(inode,
2548                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2549         if (IS_ERR(handle))
2550                 return PTR_ERR(handle);
2551         ret = dquot_commit(dquot);
2552         err = ext3_journal_stop(handle);
2553         if (!ret)
2554                 ret = err;
2555         return ret;
2556 }
2557
2558 static int ext3_acquire_dquot(struct dquot *dquot)
2559 {
2560         int ret, err;
2561         handle_t *handle;
2562
2563         handle = ext3_journal_start(dquot_to_inode(dquot),
2564                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2565         if (IS_ERR(handle))
2566                 return PTR_ERR(handle);
2567         ret = dquot_acquire(dquot);
2568         err = ext3_journal_stop(handle);
2569         if (!ret)
2570                 ret = err;
2571         return ret;
2572 }
2573
2574 static int ext3_release_dquot(struct dquot *dquot)
2575 {
2576         int ret, err;
2577         handle_t *handle;
2578
2579         handle = ext3_journal_start(dquot_to_inode(dquot),
2580                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2581         if (IS_ERR(handle))
2582                 return PTR_ERR(handle);
2583         ret = dquot_release(dquot);
2584         err = ext3_journal_stop(handle);
2585         if (!ret)
2586                 ret = err;
2587         return ret;
2588 }
2589
2590 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2591 {
2592         /* Are we journalling quotas? */
2593         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2594             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2595                 dquot_mark_dquot_dirty(dquot);
2596                 return ext3_write_dquot(dquot);
2597         } else {
2598                 return dquot_mark_dquot_dirty(dquot);
2599         }
2600 }
2601
2602 static int ext3_write_info(struct super_block *sb, int type)
2603 {
2604         int ret, err;
2605         handle_t *handle;
2606
2607         /* Data block + inode block */
2608         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2609         if (IS_ERR(handle))
2610                 return PTR_ERR(handle);
2611         ret = dquot_commit_info(sb, type);
2612         err = ext3_journal_stop(handle);
2613         if (!ret)
2614                 ret = err;
2615         return ret;
2616 }
2617
2618 /*
2619  * Turn on quotas during mount time - we need to find
2620  * the quota file and such...
2621  */
2622 static int ext3_quota_on_mount(struct super_block *sb, int type)
2623 {
2624         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2625                         EXT3_SB(sb)->s_jquota_fmt, type);
2626 }
2627
2628 /*
2629  * Standard function to be called on quota_on
2630  */
2631 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2632                          char *path)
2633 {
2634         int err;
2635         struct nameidata nd;
2636
2637         if (!test_opt(sb, QUOTA))
2638                 return -EINVAL;
2639         /* Not journalling quota? */
2640         if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2641             !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2642                 return vfs_quota_on(sb, type, format_id, path);
2643         err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2644         if (err)
2645                 return err;
2646         /* Quotafile not on the same filesystem? */
2647         if (nd.mnt->mnt_sb != sb) {
2648                 path_release(&nd);
2649                 return -EXDEV;
2650         }
2651         /* Quotafile not of fs root? */
2652         if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2653                 printk(KERN_WARNING
2654                         "EXT3-fs: Quota file not on filesystem root. "
2655                         "Journalled quota will not work.\n");
2656         path_release(&nd);
2657         return vfs_quota_on(sb, type, format_id, path);
2658 }
2659
2660 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2661  * acquiring the locks... As quota files are never truncated and quota code
2662  * itself serializes the operations (and noone else should touch the files)
2663  * we don't have to be afraid of races */
2664 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2665                                size_t len, loff_t off)
2666 {
2667         struct inode *inode = sb_dqopt(sb)->files[type];
2668         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2669         int err = 0;
2670         int offset = off & (sb->s_blocksize - 1);
2671         int tocopy;
2672         size_t toread;
2673         struct buffer_head *bh;
2674         loff_t i_size = i_size_read(inode);
2675
2676         if (off > i_size)
2677                 return 0;
2678         if (off+len > i_size)
2679                 len = i_size-off;
2680         toread = len;
2681         while (toread > 0) {
2682                 tocopy = sb->s_blocksize - offset < toread ?
2683                                 sb->s_blocksize - offset : toread;
2684                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2685                 if (err)
2686                         return err;
2687                 if (!bh)        /* A hole? */
2688                         memset(data, 0, tocopy);
2689                 else
2690                         memcpy(data, bh->b_data+offset, tocopy);
2691                 brelse(bh);
2692                 offset = 0;
2693                 toread -= tocopy;
2694                 data += tocopy;
2695                 blk++;
2696         }
2697         return len;
2698 }
2699
2700 /* Write to quotafile (we know the transaction is already started and has
2701  * enough credits) */
2702 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2703                                 const char *data, size_t len, loff_t off)
2704 {
2705         struct inode *inode = sb_dqopt(sb)->files[type];
2706         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2707         int err = 0;
2708         int offset = off & (sb->s_blocksize - 1);
2709         int tocopy;
2710         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2711         size_t towrite = len;
2712         struct buffer_head *bh;
2713         handle_t *handle = journal_current_handle();
2714
2715         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2716         while (towrite > 0) {
2717                 tocopy = sb->s_blocksize - offset < towrite ?
2718                                 sb->s_blocksize - offset : towrite;
2719                 bh = ext3_bread(handle, inode, blk, 1, &err);
2720                 if (!bh)
2721                         goto out;
2722                 if (journal_quota) {
2723                         err = ext3_journal_get_write_access(handle, bh);
2724                         if (err) {
2725                                 brelse(bh);
2726                                 goto out;
2727                         }
2728                 }
2729                 lock_buffer(bh);
2730                 memcpy(bh->b_data+offset, data, tocopy);
2731                 flush_dcache_page(bh->b_page);
2732                 unlock_buffer(bh);
2733                 if (journal_quota)
2734                         err = ext3_journal_dirty_metadata(handle, bh);
2735                 else {
2736                         /* Always do at least ordered writes for quotas */
2737                         err = ext3_journal_dirty_data(handle, bh);
2738                         mark_buffer_dirty(bh);
2739                 }
2740                 brelse(bh);
2741                 if (err)
2742                         goto out;
2743                 offset = 0;
2744                 towrite -= tocopy;
2745                 data += tocopy;
2746                 blk++;
2747         }
2748 out:
2749         if (len == towrite)
2750                 return err;
2751         if (inode->i_size < off+len-towrite) {
2752                 i_size_write(inode, off+len-towrite);
2753                 EXT3_I(inode)->i_disksize = inode->i_size;
2754         }
2755         inode->i_version++;
2756         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2757         ext3_mark_inode_dirty(handle, inode);
2758         mutex_unlock(&inode->i_mutex);
2759         return len - towrite;
2760 }
2761
2762 #endif
2763
2764 static int ext3_get_sb(struct file_system_type *fs_type,
2765         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2766 {
2767         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2768 }
2769
2770 static struct file_system_type ext3_fs_type = {
2771         .owner          = THIS_MODULE,
2772         .name           = "ext3",
2773         .get_sb         = ext3_get_sb,
2774         .kill_sb        = kill_block_super,
2775         .fs_flags       = FS_REQUIRES_DEV,
2776 };
2777
2778 static int __init init_ext3_fs(void)
2779 {
2780         int err = init_ext3_xattr();
2781         if (err)
2782                 return err;
2783         err = init_inodecache();
2784         if (err)
2785                 goto out1;
2786         err = register_filesystem(&ext3_fs_type);
2787         if (err)
2788                 goto out;
2789         return 0;
2790 out:
2791         destroy_inodecache();
2792 out1:
2793         exit_ext3_xattr();
2794         return err;
2795 }
2796
2797 static void __exit exit_ext3_fs(void)
2798 {
2799         unregister_filesystem(&ext3_fs_type);
2800         destroy_inodecache();
2801         exit_ext3_xattr();
2802 }
2803
2804 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2805 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2806 MODULE_LICENSE("GPL");
2807 module_init(init_ext3_fs)
2808 module_exit(exit_ext3_fs)