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TOMOYO Linux Cross Reference
Linux/fs/ext3/super.c

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  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/blkdev.h>
 21 #include <linux/parser.h>
 22 #include <linux/exportfs.h>
 23 #include <linux/statfs.h>
 24 #include <linux/random.h>
 25 #include <linux/mount.h>
 26 #include <linux/quotaops.h>
 27 #include <linux/seq_file.h>
 28 #include <linux/log2.h>
 29 #include <linux/cleancache.h>
 30 #include <linux/namei.h>
 31 
 32 #include <asm/uaccess.h>
 33 
 34 #define CREATE_TRACE_POINTS
 35 
 36 #include "ext3.h"
 37 #include "xattr.h"
 38 #include "acl.h"
 39 #include "namei.h"
 40 
 41 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
 42   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
 43 #else
 44   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
 45 #endif
 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 int 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 int ext3_unfreeze(struct super_block *sb);
 64 static int ext3_freeze(struct super_block *sb);
 65 
 66 /*
 67  * Wrappers for journal_start/end.
 68  */
 69 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
 70 {
 71         journal_t *journal;
 72 
 73         if (sb->s_flags & MS_RDONLY)
 74                 return ERR_PTR(-EROFS);
 75 
 76         /* Special case here: if the journal has aborted behind our
 77          * backs (eg. EIO in the commit thread), then we still need to
 78          * take the FS itself readonly cleanly. */
 79         journal = EXT3_SB(sb)->s_journal;
 80         if (is_journal_aborted(journal)) {
 81                 ext3_abort(sb, __func__,
 82                            "Detected aborted journal");
 83                 return ERR_PTR(-EROFS);
 84         }
 85 
 86         return journal_start(journal, nblocks);
 87 }
 88 
 89 int __ext3_journal_stop(const char *where, handle_t *handle)
 90 {
 91         struct super_block *sb;
 92         int err;
 93         int rc;
 94 
 95         sb = handle->h_transaction->t_journal->j_private;
 96         err = handle->h_err;
 97         rc = journal_stop(handle);
 98 
 99         if (!err)
100                 err = rc;
101         if (err)
102                 __ext3_std_error(sb, where, err);
103         return err;
104 }
105 
106 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
107                 struct buffer_head *bh, handle_t *handle, int err)
108 {
109         char nbuf[16];
110         const char *errstr = ext3_decode_error(NULL, err, nbuf);
111 
112         if (bh)
113                 BUFFER_TRACE(bh, "abort");
114 
115         if (!handle->h_err)
116                 handle->h_err = err;
117 
118         if (is_handle_aborted(handle))
119                 return;
120 
121         printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
122                 caller, errstr, err_fn);
123 
124         journal_abort_handle(handle);
125 }
126 
127 void ext3_msg(struct super_block *sb, const char *prefix,
128                 const char *fmt, ...)
129 {
130         struct va_format vaf;
131         va_list args;
132 
133         va_start(args, fmt);
134 
135         vaf.fmt = fmt;
136         vaf.va = &args;
137 
138         printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
139 
140         va_end(args);
141 }
142 
143 /* Deal with the reporting of failure conditions on a filesystem such as
144  * inconsistencies detected or read IO failures.
145  *
146  * On ext2, we can store the error state of the filesystem in the
147  * superblock.  That is not possible on ext3, because we may have other
148  * write ordering constraints on the superblock which prevent us from
149  * writing it out straight away; and given that the journal is about to
150  * be aborted, we can't rely on the current, or future, transactions to
151  * write out the superblock safely.
152  *
153  * We'll just use the journal_abort() error code to record an error in
154  * the journal instead.  On recovery, the journal will complain about
155  * that error until we've noted it down and cleared it.
156  */
157 
158 static void ext3_handle_error(struct super_block *sb)
159 {
160         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
161 
162         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
163         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
164 
165         if (sb->s_flags & MS_RDONLY)
166                 return;
167 
168         if (!test_opt (sb, ERRORS_CONT)) {
169                 journal_t *journal = EXT3_SB(sb)->s_journal;
170 
171                 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
172                 if (journal)
173                         journal_abort(journal, -EIO);
174         }
175         if (test_opt (sb, ERRORS_RO)) {
176                 ext3_msg(sb, KERN_CRIT,
177                         "error: remounting filesystem read-only");
178                 /*
179                  * Make sure updated value of ->s_mount_state will be visible
180                  * before ->s_flags update.
181                  */
182                 smp_wmb();
183                 sb->s_flags |= MS_RDONLY;
184         }
185         ext3_commit_super(sb, es, 1);
186         if (test_opt(sb, ERRORS_PANIC))
187                 panic("EXT3-fs (%s): panic forced after error\n",
188                         sb->s_id);
189 }
190 
191 void ext3_error(struct super_block *sb, const char *function,
192                 const char *fmt, ...)
193 {
194         struct va_format vaf;
195         va_list args;
196 
197         va_start(args, fmt);
198 
199         vaf.fmt = fmt;
200         vaf.va = &args;
201 
202         printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
203                sb->s_id, function, &vaf);
204 
205         va_end(args);
206 
207         ext3_handle_error(sb);
208 }
209 
210 static const char *ext3_decode_error(struct super_block * sb, int errno,
211                                      char nbuf[16])
212 {
213         char *errstr = NULL;
214 
215         switch (errno) {
216         case -EIO:
217                 errstr = "IO failure";
218                 break;
219         case -ENOMEM:
220                 errstr = "Out of memory";
221                 break;
222         case -EROFS:
223                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
224                         errstr = "Journal has aborted";
225                 else
226                         errstr = "Readonly filesystem";
227                 break;
228         default:
229                 /* If the caller passed in an extra buffer for unknown
230                  * errors, textualise them now.  Else we just return
231                  * NULL. */
232                 if (nbuf) {
233                         /* Check for truncated error codes... */
234                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
235                                 errstr = nbuf;
236                 }
237                 break;
238         }
239 
240         return errstr;
241 }
242 
243 /* __ext3_std_error decodes expected errors from journaling functions
244  * automatically and invokes the appropriate error response.  */
245 
246 void __ext3_std_error (struct super_block * sb, const char * function,
247                        int errno)
248 {
249         char nbuf[16];
250         const char *errstr;
251 
252         /* Special case: if the error is EROFS, and we're not already
253          * inside a transaction, then there's really no point in logging
254          * an error. */
255         if (errno == -EROFS && journal_current_handle() == NULL &&
256             (sb->s_flags & MS_RDONLY))
257                 return;
258 
259         errstr = ext3_decode_error(sb, errno, nbuf);
260         ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
261 
262         ext3_handle_error(sb);
263 }
264 
265 /*
266  * ext3_abort is a much stronger failure handler than ext3_error.  The
267  * abort function may be used to deal with unrecoverable failures such
268  * as journal IO errors or ENOMEM at a critical moment in log management.
269  *
270  * We unconditionally force the filesystem into an ABORT|READONLY state,
271  * unless the error response on the fs has been set to panic in which
272  * case we take the easy way out and panic immediately.
273  */
274 
275 void ext3_abort(struct super_block *sb, const char *function,
276                  const char *fmt, ...)
277 {
278         struct va_format vaf;
279         va_list args;
280 
281         va_start(args, fmt);
282 
283         vaf.fmt = fmt;
284         vaf.va = &args;
285 
286         printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
287                sb->s_id, function, &vaf);
288 
289         va_end(args);
290 
291         if (test_opt(sb, ERRORS_PANIC))
292                 panic("EXT3-fs: panic from previous error\n");
293 
294         if (sb->s_flags & MS_RDONLY)
295                 return;
296 
297         ext3_msg(sb, KERN_CRIT,
298                 "error: remounting filesystem read-only");
299         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
300         set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
301         /*
302          * Make sure updated value of ->s_mount_state will be visible
303          * before ->s_flags update.
304          */
305         smp_wmb();
306         sb->s_flags |= MS_RDONLY;
307 
308         if (EXT3_SB(sb)->s_journal)
309                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
310 }
311 
312 void ext3_warning(struct super_block *sb, const char *function,
313                   const char *fmt, ...)
314 {
315         struct va_format vaf;
316         va_list args;
317 
318         va_start(args, fmt);
319 
320         vaf.fmt = fmt;
321         vaf.va = &args;
322 
323         printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
324                sb->s_id, function, &vaf);
325 
326         va_end(args);
327 }
328 
329 void ext3_update_dynamic_rev(struct super_block *sb)
330 {
331         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
332 
333         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
334                 return;
335 
336         ext3_msg(sb, KERN_WARNING,
337                 "warning: updating to rev %d because of "
338                 "new feature flag, running e2fsck is recommended",
339                 EXT3_DYNAMIC_REV);
340 
341         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
342         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
343         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
344         /* leave es->s_feature_*compat flags alone */
345         /* es->s_uuid will be set by e2fsck if empty */
346 
347         /*
348          * The rest of the superblock fields should be zero, and if not it
349          * means they are likely already in use, so leave them alone.  We
350          * can leave it up to e2fsck to clean up any inconsistencies there.
351          */
352 }
353 
354 /*
355  * Open the external journal device
356  */
357 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
358 {
359         struct block_device *bdev;
360         char b[BDEVNAME_SIZE];
361 
362         bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
363         if (IS_ERR(bdev))
364                 goto fail;
365         return bdev;
366 
367 fail:
368         ext3_msg(sb, KERN_ERR, "error: failed to open journal device %s: %ld",
369                 __bdevname(dev, b), PTR_ERR(bdev));
370 
371         return NULL;
372 }
373 
374 /*
375  * Release the journal device
376  */
377 static void ext3_blkdev_put(struct block_device *bdev)
378 {
379         blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
380 }
381 
382 static void ext3_blkdev_remove(struct ext3_sb_info *sbi)
383 {
384         struct block_device *bdev;
385         bdev = sbi->journal_bdev;
386         if (bdev) {
387                 ext3_blkdev_put(bdev);
388                 sbi->journal_bdev = NULL;
389         }
390 }
391 
392 static inline struct inode *orphan_list_entry(struct list_head *l)
393 {
394         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
395 }
396 
397 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
398 {
399         struct list_head *l;
400 
401         ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
402                le32_to_cpu(sbi->s_es->s_last_orphan));
403 
404         ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
405         list_for_each(l, &sbi->s_orphan) {
406                 struct inode *inode = orphan_list_entry(l);
407                 ext3_msg(sb, KERN_ERR, "  "
408                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
409                        inode->i_sb->s_id, inode->i_ino, inode,
410                        inode->i_mode, inode->i_nlink,
411                        NEXT_ORPHAN(inode));
412         }
413 }
414 
415 static void ext3_put_super (struct super_block * sb)
416 {
417         struct ext3_sb_info *sbi = EXT3_SB(sb);
418         struct ext3_super_block *es = sbi->s_es;
419         int i, err;
420 
421         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
422         ext3_xattr_put_super(sb);
423         err = journal_destroy(sbi->s_journal);
424         sbi->s_journal = NULL;
425         if (err < 0)
426                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
427 
428         if (!(sb->s_flags & MS_RDONLY)) {
429                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
430                 es->s_state = cpu_to_le16(sbi->s_mount_state);
431                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
432                 mark_buffer_dirty(sbi->s_sbh);
433                 ext3_commit_super(sb, es, 1);
434         }
435 
436         for (i = 0; i < sbi->s_gdb_count; i++)
437                 brelse(sbi->s_group_desc[i]);
438         kfree(sbi->s_group_desc);
439         percpu_counter_destroy(&sbi->s_freeblocks_counter);
440         percpu_counter_destroy(&sbi->s_freeinodes_counter);
441         percpu_counter_destroy(&sbi->s_dirs_counter);
442         brelse(sbi->s_sbh);
443 #ifdef CONFIG_QUOTA
444         for (i = 0; i < MAXQUOTAS; i++)
445                 kfree(sbi->s_qf_names[i]);
446 #endif
447 
448         /* Debugging code just in case the in-memory inode orphan list
449          * isn't empty.  The on-disk one can be non-empty if we've
450          * detected an error and taken the fs readonly, but the
451          * in-memory list had better be clean by this point. */
452         if (!list_empty(&sbi->s_orphan))
453                 dump_orphan_list(sb, sbi);
454         J_ASSERT(list_empty(&sbi->s_orphan));
455 
456         invalidate_bdev(sb->s_bdev);
457         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
458                 /*
459                  * Invalidate the journal device's buffers.  We don't want them
460                  * floating about in memory - the physical journal device may
461                  * hotswapped, and it breaks the `ro-after' testing code.
462                  */
463                 sync_blockdev(sbi->journal_bdev);
464                 invalidate_bdev(sbi->journal_bdev);
465                 ext3_blkdev_remove(sbi);
466         }
467         sb->s_fs_info = NULL;
468         kfree(sbi->s_blockgroup_lock);
469         kfree(sbi);
470 }
471 
472 static struct kmem_cache *ext3_inode_cachep;
473 
474 /*
475  * Called inside transaction, so use GFP_NOFS
476  */
477 static struct inode *ext3_alloc_inode(struct super_block *sb)
478 {
479         struct ext3_inode_info *ei;
480 
481         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
482         if (!ei)
483                 return NULL;
484         ei->i_block_alloc_info = NULL;
485         ei->vfs_inode.i_version = 1;
486         atomic_set(&ei->i_datasync_tid, 0);
487         atomic_set(&ei->i_sync_tid, 0);
488         return &ei->vfs_inode;
489 }
490 
491 static int ext3_drop_inode(struct inode *inode)
492 {
493         int drop = generic_drop_inode(inode);
494 
495         trace_ext3_drop_inode(inode, drop);
496         return drop;
497 }
498 
499 static void ext3_i_callback(struct rcu_head *head)
500 {
501         struct inode *inode = container_of(head, struct inode, i_rcu);
502         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
503 }
504 
505 static void ext3_destroy_inode(struct inode *inode)
506 {
507         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
508                 printk("EXT3 Inode %p: orphan list check failed!\n",
509                         EXT3_I(inode));
510                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
511                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
512                                 false);
513                 dump_stack();
514         }
515         call_rcu(&inode->i_rcu, ext3_i_callback);
516 }
517 
518 static void init_once(void *foo)
519 {
520         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
521 
522         INIT_LIST_HEAD(&ei->i_orphan);
523 #ifdef CONFIG_EXT3_FS_XATTR
524         init_rwsem(&ei->xattr_sem);
525 #endif
526         mutex_init(&ei->truncate_mutex);
527         inode_init_once(&ei->vfs_inode);
528 }
529 
530 static int init_inodecache(void)
531 {
532         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
533                                              sizeof(struct ext3_inode_info),
534                                              0, (SLAB_RECLAIM_ACCOUNT|
535                                                 SLAB_MEM_SPREAD),
536                                              init_once);
537         if (ext3_inode_cachep == NULL)
538                 return -ENOMEM;
539         return 0;
540 }
541 
542 static void destroy_inodecache(void)
543 {
544         /*
545          * Make sure all delayed rcu free inodes are flushed before we
546          * destroy cache.
547          */
548         rcu_barrier();
549         kmem_cache_destroy(ext3_inode_cachep);
550 }
551 
552 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
553 {
554 #if defined(CONFIG_QUOTA)
555         struct ext3_sb_info *sbi = EXT3_SB(sb);
556 
557         if (sbi->s_jquota_fmt) {
558                 char *fmtname = "";
559 
560                 switch (sbi->s_jquota_fmt) {
561                 case QFMT_VFS_OLD:
562                         fmtname = "vfsold";
563                         break;
564                 case QFMT_VFS_V0:
565                         fmtname = "vfsv0";
566                         break;
567                 case QFMT_VFS_V1:
568                         fmtname = "vfsv1";
569                         break;
570                 }
571                 seq_printf(seq, ",jqfmt=%s", fmtname);
572         }
573 
574         if (sbi->s_qf_names[USRQUOTA])
575                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
576 
577         if (sbi->s_qf_names[GRPQUOTA])
578                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
579 
580         if (test_opt(sb, USRQUOTA))
581                 seq_puts(seq, ",usrquota");
582 
583         if (test_opt(sb, GRPQUOTA))
584                 seq_puts(seq, ",grpquota");
585 #endif
586 }
587 
588 static char *data_mode_string(unsigned long mode)
589 {
590         switch (mode) {
591         case EXT3_MOUNT_JOURNAL_DATA:
592                 return "journal";
593         case EXT3_MOUNT_ORDERED_DATA:
594                 return "ordered";
595         case EXT3_MOUNT_WRITEBACK_DATA:
596                 return "writeback";
597         }
598         return "unknown";
599 }
600 
601 /*
602  * Show an option if
603  *  - it's set to a non-default value OR
604  *  - if the per-sb default is different from the global default
605  */
606 static int ext3_show_options(struct seq_file *seq, struct dentry *root)
607 {
608         struct super_block *sb = root->d_sb;
609         struct ext3_sb_info *sbi = EXT3_SB(sb);
610         struct ext3_super_block *es = sbi->s_es;
611         unsigned long def_mount_opts;
612 
613         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
614 
615         if (sbi->s_sb_block != 1)
616                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
617         if (test_opt(sb, MINIX_DF))
618                 seq_puts(seq, ",minixdf");
619         if (test_opt(sb, GRPID))
620                 seq_puts(seq, ",grpid");
621         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
622                 seq_puts(seq, ",nogrpid");
623         if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
624             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
625                 seq_printf(seq, ",resuid=%u",
626                                 from_kuid_munged(&init_user_ns, sbi->s_resuid));
627         }
628         if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
629             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
630                 seq_printf(seq, ",resgid=%u",
631                                 from_kgid_munged(&init_user_ns, sbi->s_resgid));
632         }
633         if (test_opt(sb, ERRORS_RO)) {
634                 int def_errors = le16_to_cpu(es->s_errors);
635 
636                 if (def_errors == EXT3_ERRORS_PANIC ||
637                     def_errors == EXT3_ERRORS_CONTINUE) {
638                         seq_puts(seq, ",errors=remount-ro");
639                 }
640         }
641         if (test_opt(sb, ERRORS_CONT))
642                 seq_puts(seq, ",errors=continue");
643         if (test_opt(sb, ERRORS_PANIC))
644                 seq_puts(seq, ",errors=panic");
645         if (test_opt(sb, NO_UID32))
646                 seq_puts(seq, ",nouid32");
647         if (test_opt(sb, DEBUG))
648                 seq_puts(seq, ",debug");
649 #ifdef CONFIG_EXT3_FS_XATTR
650         if (test_opt(sb, XATTR_USER))
651                 seq_puts(seq, ",user_xattr");
652         if (!test_opt(sb, XATTR_USER) &&
653             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
654                 seq_puts(seq, ",nouser_xattr");
655         }
656 #endif
657 #ifdef CONFIG_EXT3_FS_POSIX_ACL
658         if (test_opt(sb, POSIX_ACL))
659                 seq_puts(seq, ",acl");
660         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
661                 seq_puts(seq, ",noacl");
662 #endif
663         if (!test_opt(sb, RESERVATION))
664                 seq_puts(seq, ",noreservation");
665         if (sbi->s_commit_interval) {
666                 seq_printf(seq, ",commit=%u",
667                            (unsigned) (sbi->s_commit_interval / HZ));
668         }
669 
670         /*
671          * Always display barrier state so it's clear what the status is.
672          */
673         seq_puts(seq, ",barrier=");
674         seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "");
675         seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
676         if (test_opt(sb, DATA_ERR_ABORT))
677                 seq_puts(seq, ",data_err=abort");
678 
679         if (test_opt(sb, NOLOAD))
680                 seq_puts(seq, ",norecovery");
681 
682         ext3_show_quota_options(seq, sb);
683 
684         return 0;
685 }
686 
687 
688 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
689                 u64 ino, u32 generation)
690 {
691         struct inode *inode;
692 
693         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
694                 return ERR_PTR(-ESTALE);
695         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
696                 return ERR_PTR(-ESTALE);
697 
698         /* iget isn't really right if the inode is currently unallocated!!
699          *
700          * ext3_read_inode will return a bad_inode if the inode had been
701          * deleted, so we should be safe.
702          *
703          * Currently we don't know the generation for parent directory, so
704          * a generation of 0 means "accept any"
705          */
706         inode = ext3_iget(sb, ino);
707         if (IS_ERR(inode))
708                 return ERR_CAST(inode);
709         if (generation && inode->i_generation != generation) {
710                 iput(inode);
711                 return ERR_PTR(-ESTALE);
712         }
713 
714         return inode;
715 }
716 
717 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
718                 int fh_len, int fh_type)
719 {
720         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
721                                     ext3_nfs_get_inode);
722 }
723 
724 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
725                 int fh_len, int fh_type)
726 {
727         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
728                                     ext3_nfs_get_inode);
729 }
730 
731 /*
732  * Try to release metadata pages (indirect blocks, directories) which are
733  * mapped via the block device.  Since these pages could have journal heads
734  * which would prevent try_to_free_buffers() from freeing them, we must use
735  * jbd layer's try_to_free_buffers() function to release them.
736  */
737 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
738                                  gfp_t wait)
739 {
740         journal_t *journal = EXT3_SB(sb)->s_journal;
741 
742         WARN_ON(PageChecked(page));
743         if (!page_has_buffers(page))
744                 return 0;
745         if (journal)
746                 return journal_try_to_free_buffers(journal, page, 
747                                                    wait & ~__GFP_WAIT);
748         return try_to_free_buffers(page);
749 }
750 
751 #ifdef CONFIG_QUOTA
752 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
753 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
754 
755 static int ext3_write_dquot(struct dquot *dquot);
756 static int ext3_acquire_dquot(struct dquot *dquot);
757 static int ext3_release_dquot(struct dquot *dquot);
758 static int ext3_mark_dquot_dirty(struct dquot *dquot);
759 static int ext3_write_info(struct super_block *sb, int type);
760 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
761                          struct path *path);
762 static int ext3_quota_on_mount(struct super_block *sb, int type);
763 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
764                                size_t len, loff_t off);
765 static ssize_t ext3_quota_write(struct super_block *sb, int type,
766                                 const char *data, size_t len, loff_t off);
767 
768 static const struct dquot_operations ext3_quota_operations = {
769         .write_dquot    = ext3_write_dquot,
770         .acquire_dquot  = ext3_acquire_dquot,
771         .release_dquot  = ext3_release_dquot,
772         .mark_dirty     = ext3_mark_dquot_dirty,
773         .write_info     = ext3_write_info,
774         .alloc_dquot    = dquot_alloc,
775         .destroy_dquot  = dquot_destroy,
776 };
777 
778 static const struct quotactl_ops ext3_qctl_operations = {
779         .quota_on       = ext3_quota_on,
780         .quota_off      = dquot_quota_off,
781         .quota_sync     = dquot_quota_sync,
782         .get_info       = dquot_get_dqinfo,
783         .set_info       = dquot_set_dqinfo,
784         .get_dqblk      = dquot_get_dqblk,
785         .set_dqblk      = dquot_set_dqblk
786 };
787 #endif
788 
789 static const struct super_operations ext3_sops = {
790         .alloc_inode    = ext3_alloc_inode,
791         .destroy_inode  = ext3_destroy_inode,
792         .write_inode    = ext3_write_inode,
793         .dirty_inode    = ext3_dirty_inode,
794         .drop_inode     = ext3_drop_inode,
795         .evict_inode    = ext3_evict_inode,
796         .put_super      = ext3_put_super,
797         .sync_fs        = ext3_sync_fs,
798         .freeze_fs      = ext3_freeze,
799         .unfreeze_fs    = ext3_unfreeze,
800         .statfs         = ext3_statfs,
801         .remount_fs     = ext3_remount,
802         .show_options   = ext3_show_options,
803 #ifdef CONFIG_QUOTA
804         .quota_read     = ext3_quota_read,
805         .quota_write    = ext3_quota_write,
806 #endif
807         .bdev_try_to_free_page = bdev_try_to_free_page,
808 };
809 
810 static const struct export_operations ext3_export_ops = {
811         .fh_to_dentry = ext3_fh_to_dentry,
812         .fh_to_parent = ext3_fh_to_parent,
813         .get_parent = ext3_get_parent,
814 };
815 
816 enum {
817         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
818         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
819         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
820         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
821         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
822         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
823         Opt_journal_path,
824         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
825         Opt_data_err_abort, Opt_data_err_ignore,
826         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
827         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
828         Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
829         Opt_resize, Opt_usrquota, Opt_grpquota
830 };
831 
832 static const match_table_t tokens = {
833         {Opt_bsd_df, "bsddf"},
834         {Opt_minix_df, "minixdf"},
835         {Opt_grpid, "grpid"},
836         {Opt_grpid, "bsdgroups"},
837         {Opt_nogrpid, "nogrpid"},
838         {Opt_nogrpid, "sysvgroups"},
839         {Opt_resgid, "resgid=%u"},
840         {Opt_resuid, "resuid=%u"},
841         {Opt_sb, "sb=%u"},
842         {Opt_err_cont, "errors=continue"},
843         {Opt_err_panic, "errors=panic"},
844         {Opt_err_ro, "errors=remount-ro"},
845         {Opt_nouid32, "nouid32"},
846         {Opt_nocheck, "nocheck"},
847         {Opt_nocheck, "check=none"},
848         {Opt_debug, "debug"},
849         {Opt_oldalloc, "oldalloc"},
850         {Opt_orlov, "orlov"},
851         {Opt_user_xattr, "user_xattr"},
852         {Opt_nouser_xattr, "nouser_xattr"},
853         {Opt_acl, "acl"},
854         {Opt_noacl, "noacl"},
855         {Opt_reservation, "reservation"},
856         {Opt_noreservation, "noreservation"},
857         {Opt_noload, "noload"},
858         {Opt_noload, "norecovery"},
859         {Opt_nobh, "nobh"},
860         {Opt_bh, "bh"},
861         {Opt_commit, "commit=%u"},
862         {Opt_journal_update, "journal=update"},
863         {Opt_journal_inum, "journal=%u"},
864         {Opt_journal_dev, "journal_dev=%u"},
865         {Opt_journal_path, "journal_path=%s"},
866         {Opt_abort, "abort"},
867         {Opt_data_journal, "data=journal"},
868         {Opt_data_ordered, "data=ordered"},
869         {Opt_data_writeback, "data=writeback"},
870         {Opt_data_err_abort, "data_err=abort"},
871         {Opt_data_err_ignore, "data_err=ignore"},
872         {Opt_offusrjquota, "usrjquota="},
873         {Opt_usrjquota, "usrjquota=%s"},
874         {Opt_offgrpjquota, "grpjquota="},
875         {Opt_grpjquota, "grpjquota=%s"},
876         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
877         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
878         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
879         {Opt_grpquota, "grpquota"},
880         {Opt_noquota, "noquota"},
881         {Opt_quota, "quota"},
882         {Opt_usrquota, "usrquota"},
883         {Opt_barrier, "barrier=%u"},
884         {Opt_barrier, "barrier"},
885         {Opt_nobarrier, "nobarrier"},
886         {Opt_resize, "resize"},
887         {Opt_err, NULL},
888 };
889 
890 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
891 {
892         ext3_fsblk_t    sb_block;
893         char            *options = (char *) *data;
894 
895         if (!options || strncmp(options, "sb=", 3) != 0)
896                 return 1;       /* Default location */
897         options += 3;
898         /*todo: use simple_strtoll with >32bit ext3 */
899         sb_block = simple_strtoul(options, &options, 0);
900         if (*options && *options != ',') {
901                 ext3_msg(sb, KERN_ERR, "error: invalid sb specification: %s",
902                        (char *) *data);
903                 return 1;
904         }
905         if (*options == ',')
906                 options++;
907         *data = (void *) options;
908         return sb_block;
909 }
910 
911 #ifdef CONFIG_QUOTA
912 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
913 {
914         struct ext3_sb_info *sbi = EXT3_SB(sb);
915         char *qname;
916 
917         if (sb_any_quota_loaded(sb) &&
918                 !sbi->s_qf_names[qtype]) {
919                 ext3_msg(sb, KERN_ERR,
920                         "Cannot change journaled "
921                         "quota options when quota turned on");
922                 return 0;
923         }
924         qname = match_strdup(args);
925         if (!qname) {
926                 ext3_msg(sb, KERN_ERR,
927                         "Not enough memory for storing quotafile name");
928                 return 0;
929         }
930         if (sbi->s_qf_names[qtype]) {
931                 int same = !strcmp(sbi->s_qf_names[qtype], qname);
932 
933                 kfree(qname);
934                 if (!same) {
935                         ext3_msg(sb, KERN_ERR,
936                                  "%s quota file already specified",
937                                  QTYPE2NAME(qtype));
938                 }
939                 return same;
940         }
941         if (strchr(qname, '/')) {
942                 ext3_msg(sb, KERN_ERR,
943                         "quotafile must be on filesystem root");
944                 kfree(qname);
945                 return 0;
946         }
947         sbi->s_qf_names[qtype] = qname;
948         set_opt(sbi->s_mount_opt, QUOTA);
949         return 1;
950 }
951 
952 static int clear_qf_name(struct super_block *sb, int qtype) {
953 
954         struct ext3_sb_info *sbi = EXT3_SB(sb);
955 
956         if (sb_any_quota_loaded(sb) &&
957                 sbi->s_qf_names[qtype]) {
958                 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
959                         " when quota turned on");
960                 return 0;
961         }
962         if (sbi->s_qf_names[qtype]) {
963                 kfree(sbi->s_qf_names[qtype]);
964                 sbi->s_qf_names[qtype] = NULL;
965         }
966         return 1;
967 }
968 #endif
969 
970 static int parse_options (char *options, struct super_block *sb,
971                           unsigned int *inum, unsigned long *journal_devnum,
972                           ext3_fsblk_t *n_blocks_count, int is_remount)
973 {
974         struct ext3_sb_info *sbi = EXT3_SB(sb);
975         char * p;
976         substring_t args[MAX_OPT_ARGS];
977         int data_opt = 0;
978         int option;
979         kuid_t uid;
980         kgid_t gid;
981         char *journal_path;
982         struct inode *journal_inode;
983         struct path path;
984         int error;
985 
986 #ifdef CONFIG_QUOTA
987         int qfmt;
988 #endif
989 
990         if (!options)
991                 return 1;
992 
993         while ((p = strsep (&options, ",")) != NULL) {
994                 int token;
995                 if (!*p)
996                         continue;
997                 /*
998                  * Initialize args struct so we know whether arg was
999                  * found; some options take optional arguments.
1000                  */
1001                 args[0].to = args[0].from = NULL;
1002                 token = match_token(p, tokens, args);
1003                 switch (token) {
1004                 case Opt_bsd_df:
1005                         clear_opt (sbi->s_mount_opt, MINIX_DF);
1006                         break;
1007                 case Opt_minix_df:
1008                         set_opt (sbi->s_mount_opt, MINIX_DF);
1009                         break;
1010                 case Opt_grpid:
1011                         set_opt (sbi->s_mount_opt, GRPID);
1012                         break;
1013                 case Opt_nogrpid:
1014                         clear_opt (sbi->s_mount_opt, GRPID);
1015                         break;
1016                 case Opt_resuid:
1017                         if (match_int(&args[0], &option))
1018                                 return 0;
1019                         uid = make_kuid(current_user_ns(), option);
1020                         if (!uid_valid(uid)) {
1021                                 ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option);
1022                                 return 0;
1023 
1024                         }
1025                         sbi->s_resuid = uid;
1026                         break;
1027                 case Opt_resgid:
1028                         if (match_int(&args[0], &option))
1029                                 return 0;
1030                         gid = make_kgid(current_user_ns(), option);
1031                         if (!gid_valid(gid)) {
1032                                 ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option);
1033                                 return 0;
1034                         }
1035                         sbi->s_resgid = gid;
1036                         break;
1037                 case Opt_sb:
1038                         /* handled by get_sb_block() instead of here */
1039                         /* *sb_block = match_int(&args[0]); */
1040                         break;
1041                 case Opt_err_panic:
1042                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1043                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1044                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1045                         break;
1046                 case Opt_err_ro:
1047                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1048                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1049                         set_opt (sbi->s_mount_opt, ERRORS_RO);
1050                         break;
1051                 case Opt_err_cont:
1052                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1053                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1054                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
1055                         break;
1056                 case Opt_nouid32:
1057                         set_opt (sbi->s_mount_opt, NO_UID32);
1058                         break;
1059                 case Opt_nocheck:
1060                         clear_opt (sbi->s_mount_opt, CHECK);
1061                         break;
1062                 case Opt_debug:
1063                         set_opt (sbi->s_mount_opt, DEBUG);
1064                         break;
1065                 case Opt_oldalloc:
1066                         ext3_msg(sb, KERN_WARNING,
1067                                 "Ignoring deprecated oldalloc option");
1068                         break;
1069                 case Opt_orlov:
1070                         ext3_msg(sb, KERN_WARNING,
1071                                 "Ignoring deprecated orlov option");
1072                         break;
1073 #ifdef CONFIG_EXT3_FS_XATTR
1074                 case Opt_user_xattr:
1075                         set_opt (sbi->s_mount_opt, XATTR_USER);
1076                         break;
1077                 case Opt_nouser_xattr:
1078                         clear_opt (sbi->s_mount_opt, XATTR_USER);
1079                         break;
1080 #else
1081                 case Opt_user_xattr:
1082                 case Opt_nouser_xattr:
1083                         ext3_msg(sb, KERN_INFO,
1084                                 "(no)user_xattr options not supported");
1085                         break;
1086 #endif
1087 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1088                 case Opt_acl:
1089                         set_opt(sbi->s_mount_opt, POSIX_ACL);
1090                         break;
1091                 case Opt_noacl:
1092                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
1093                         break;
1094 #else
1095                 case Opt_acl:
1096                 case Opt_noacl:
1097                         ext3_msg(sb, KERN_INFO,
1098                                 "(no)acl options not supported");
1099                         break;
1100 #endif
1101                 case Opt_reservation:
1102                         set_opt(sbi->s_mount_opt, RESERVATION);
1103                         break;
1104                 case Opt_noreservation:
1105                         clear_opt(sbi->s_mount_opt, RESERVATION);
1106                         break;
1107                 case Opt_journal_update:
1108                         /* @@@ FIXME */
1109                         /* Eventually we will want to be able to create
1110                            a journal file here.  For now, only allow the
1111                            user to specify an existing inode to be the
1112                            journal file. */
1113                         if (is_remount) {
1114                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1115                                         "journal on remount");
1116                                 return 0;
1117                         }
1118                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1119                         break;
1120                 case Opt_journal_inum:
1121                         if (is_remount) {
1122                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1123                                        "journal on remount");
1124                                 return 0;
1125                         }
1126                         if (match_int(&args[0], &option))
1127                                 return 0;
1128                         *inum = option;
1129                         break;
1130                 case Opt_journal_dev:
1131                         if (is_remount) {
1132                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1133                                        "journal on remount");
1134                                 return 0;
1135                         }
1136                         if (match_int(&args[0], &option))
1137                                 return 0;
1138                         *journal_devnum = option;
1139                         break;
1140                 case Opt_journal_path:
1141                         if (is_remount) {
1142                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1143                                        "journal on remount");
1144                                 return 0;
1145                         }
1146 
1147                         journal_path = match_strdup(&args[0]);
1148                         if (!journal_path) {
1149                                 ext3_msg(sb, KERN_ERR, "error: could not dup "
1150                                         "journal device string");
1151                                 return 0;
1152                         }
1153 
1154                         error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1155                         if (error) {
1156                                 ext3_msg(sb, KERN_ERR, "error: could not find "
1157                                         "journal device path: error %d", error);
1158                                 kfree(journal_path);
1159                                 return 0;
1160                         }
1161 
1162                         journal_inode = path.dentry->d_inode;
1163                         if (!S_ISBLK(journal_inode->i_mode)) {
1164                                 ext3_msg(sb, KERN_ERR, "error: journal path %s "
1165                                         "is not a block device", journal_path);
1166                                 path_put(&path);
1167                                 kfree(journal_path);
1168                                 return 0;
1169                         }
1170 
1171                         *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1172                         path_put(&path);
1173                         kfree(journal_path);
1174                         break;
1175                 case Opt_noload:
1176                         set_opt (sbi->s_mount_opt, NOLOAD);
1177                         break;
1178                 case Opt_commit:
1179                         if (match_int(&args[0], &option))
1180                                 return 0;
1181                         if (option < 0)
1182                                 return 0;
1183                         if (option == 0)
1184                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1185                         sbi->s_commit_interval = HZ * option;
1186                         break;
1187                 case Opt_data_journal:
1188                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1189                         goto datacheck;
1190                 case Opt_data_ordered:
1191                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1192                         goto datacheck;
1193                 case Opt_data_writeback:
1194                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1195                 datacheck:
1196                         if (is_remount) {
1197                                 if (test_opt(sb, DATA_FLAGS) == data_opt)
1198                                         break;
1199                                 ext3_msg(sb, KERN_ERR,
1200                                         "error: cannot change "
1201                                         "data mode on remount. The filesystem "
1202                                         "is mounted in data=%s mode and you "
1203                                         "try to remount it in data=%s mode.",
1204                                         data_mode_string(test_opt(sb,
1205                                                         DATA_FLAGS)),
1206                                         data_mode_string(data_opt));
1207                                 return 0;
1208                         } else {
1209                                 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1210                                 sbi->s_mount_opt |= data_opt;
1211                         }
1212                         break;
1213                 case Opt_data_err_abort:
1214                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1215                         break;
1216                 case Opt_data_err_ignore:
1217                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1218                         break;
1219 #ifdef CONFIG_QUOTA
1220                 case Opt_usrjquota:
1221                         if (!set_qf_name(sb, USRQUOTA, &args[0]))
1222                                 return 0;
1223                         break;
1224                 case Opt_grpjquota:
1225                         if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1226                                 return 0;
1227                         break;
1228                 case Opt_offusrjquota:
1229                         if (!clear_qf_name(sb, USRQUOTA))
1230                                 return 0;
1231                         break;
1232                 case Opt_offgrpjquota:
1233                         if (!clear_qf_name(sb, GRPQUOTA))
1234                                 return 0;
1235                         break;
1236                 case Opt_jqfmt_vfsold:
1237                         qfmt = QFMT_VFS_OLD;
1238                         goto set_qf_format;
1239                 case Opt_jqfmt_vfsv0:
1240                         qfmt = QFMT_VFS_V0;
1241                         goto set_qf_format;
1242                 case Opt_jqfmt_vfsv1:
1243                         qfmt = QFMT_VFS_V1;
1244 set_qf_format:
1245                         if (sb_any_quota_loaded(sb) &&
1246                             sbi->s_jquota_fmt != qfmt) {
1247                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1248                                         "journaled quota options when "
1249                                         "quota turned on.");
1250                                 return 0;
1251                         }
1252                         sbi->s_jquota_fmt = qfmt;
1253                         break;
1254                 case Opt_quota:
1255                 case Opt_usrquota:
1256                         set_opt(sbi->s_mount_opt, QUOTA);
1257                         set_opt(sbi->s_mount_opt, USRQUOTA);
1258                         break;
1259                 case Opt_grpquota:
1260                         set_opt(sbi->s_mount_opt, QUOTA);
1261                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1262                         break;
1263                 case Opt_noquota:
1264                         if (sb_any_quota_loaded(sb)) {
1265                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1266                                         "quota options when quota turned on.");
1267                                 return 0;
1268                         }
1269                         clear_opt(sbi->s_mount_opt, QUOTA);
1270                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1271                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1272                         break;
1273 #else
1274                 case Opt_quota:
1275                 case Opt_usrquota:
1276                 case Opt_grpquota:
1277                         ext3_msg(sb, KERN_ERR,
1278                                 "error: quota options not supported.");
1279                         break;
1280                 case Opt_usrjquota:
1281                 case Opt_grpjquota:
1282                 case Opt_offusrjquota:
1283                 case Opt_offgrpjquota:
1284                 case Opt_jqfmt_vfsold:
1285                 case Opt_jqfmt_vfsv0:
1286                 case Opt_jqfmt_vfsv1:
1287                         ext3_msg(sb, KERN_ERR,
1288                                 "error: journaled quota options not "
1289                                 "supported.");
1290                         break;
1291                 case Opt_noquota:
1292                         break;
1293 #endif
1294                 case Opt_abort:
1295                         set_opt(sbi->s_mount_opt, ABORT);
1296                         break;
1297                 case Opt_nobarrier:
1298                         clear_opt(sbi->s_mount_opt, BARRIER);
1299                         break;
1300                 case Opt_barrier:
1301                         if (args[0].from) {
1302                                 if (match_int(&args[0], &option))
1303                                         return 0;
1304                         } else
1305                                 option = 1;     /* No argument, default to 1 */
1306                         if (option)
1307                                 set_opt(sbi->s_mount_opt, BARRIER);
1308                         else
1309                                 clear_opt(sbi->s_mount_opt, BARRIER);
1310                         break;
1311                 case Opt_ignore:
1312                         break;
1313                 case Opt_resize:
1314                         if (!is_remount) {
1315                                 ext3_msg(sb, KERN_ERR,
1316                                         "error: resize option only available "
1317                                         "for remount");
1318                                 return 0;
1319                         }
1320                         if (match_int(&args[0], &option) != 0)
1321                                 return 0;
1322                         *n_blocks_count = option;
1323                         break;
1324                 case Opt_nobh:
1325                         ext3_msg(sb, KERN_WARNING,
1326                                 "warning: ignoring deprecated nobh option");
1327                         break;
1328                 case Opt_bh:
1329                         ext3_msg(sb, KERN_WARNING,
1330                                 "warning: ignoring deprecated bh option");
1331                         break;
1332                 default:
1333                         ext3_msg(sb, KERN_ERR,
1334                                 "error: unrecognized mount option \"%s\" "
1335                                 "or missing value", p);
1336                         return 0;
1337                 }
1338         }
1339 #ifdef CONFIG_QUOTA
1340         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1341                 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1342                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1343                 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1344                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1345 
1346                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1347                         ext3_msg(sb, KERN_ERR, "error: old and new quota "
1348                                         "format mixing.");
1349                         return 0;
1350                 }
1351 
1352                 if (!sbi->s_jquota_fmt) {
1353                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1354                                         "not specified.");
1355                         return 0;
1356                 }
1357         }
1358 #endif
1359         return 1;
1360 }
1361 
1362 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1363                             int read_only)
1364 {
1365         struct ext3_sb_info *sbi = EXT3_SB(sb);
1366         int res = 0;
1367 
1368         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1369                 ext3_msg(sb, KERN_ERR,
1370                         "error: revision level too high, "
1371                         "forcing read-only mode");
1372                 res = MS_RDONLY;
1373         }
1374         if (read_only)
1375                 return res;
1376         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1377                 ext3_msg(sb, KERN_WARNING,
1378                         "warning: mounting unchecked fs, "
1379                         "running e2fsck is recommended");
1380         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1381                 ext3_msg(sb, KERN_WARNING,
1382                         "warning: mounting fs with errors, "
1383                         "running e2fsck is recommended");
1384         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1385                  le16_to_cpu(es->s_mnt_count) >=
1386                         le16_to_cpu(es->s_max_mnt_count))
1387                 ext3_msg(sb, KERN_WARNING,
1388                         "warning: maximal mount count reached, "
1389                         "running e2fsck is recommended");
1390         else if (le32_to_cpu(es->s_checkinterval) &&
1391                 (le32_to_cpu(es->s_lastcheck) +
1392                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1393                 ext3_msg(sb, KERN_WARNING,
1394                         "warning: checktime reached, "
1395                         "running e2fsck is recommended");
1396 #if 0
1397                 /* @@@ We _will_ want to clear the valid bit if we find
1398                    inconsistencies, to force a fsck at reboot.  But for
1399                    a plain journaled filesystem we can keep it set as
1400                    valid forever! :) */
1401         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1402 #endif
1403         if (!le16_to_cpu(es->s_max_mnt_count))
1404                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1405         le16_add_cpu(&es->s_mnt_count, 1);
1406         es->s_mtime = cpu_to_le32(get_seconds());
1407         ext3_update_dynamic_rev(sb);
1408         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1409 
1410         ext3_commit_super(sb, es, 1);
1411         if (test_opt(sb, DEBUG))
1412                 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1413                                 "bpg=%lu, ipg=%lu, mo=%04lx]",
1414                         sb->s_blocksize,
1415                         sbi->s_groups_count,
1416                         EXT3_BLOCKS_PER_GROUP(sb),
1417                         EXT3_INODES_PER_GROUP(sb),
1418                         sbi->s_mount_opt);
1419 
1420         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1421                 char b[BDEVNAME_SIZE];
1422                 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1423                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1424         } else {
1425                 ext3_msg(sb, KERN_INFO, "using internal journal");
1426         }
1427         cleancache_init_fs(sb);
1428         return res;
1429 }
1430 
1431 /* Called at mount-time, super-block is locked */
1432 static int ext3_check_descriptors(struct super_block *sb)
1433 {
1434         struct ext3_sb_info *sbi = EXT3_SB(sb);
1435         int i;
1436 
1437         ext3_debug ("Checking group descriptors");
1438 
1439         for (i = 0; i < sbi->s_groups_count; i++) {
1440                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1441                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1442                 ext3_fsblk_t last_block;
1443 
1444                 if (i == sbi->s_groups_count - 1)
1445                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1446                 else
1447                         last_block = first_block +
1448                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1449 
1450                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1451                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1452                 {
1453                         ext3_error (sb, "ext3_check_descriptors",
1454                                     "Block bitmap for group %d"
1455                                     " not in group (block %lu)!",
1456                                     i, (unsigned long)
1457                                         le32_to_cpu(gdp->bg_block_bitmap));
1458                         return 0;
1459                 }
1460                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1461                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1462                 {
1463                         ext3_error (sb, "ext3_check_descriptors",
1464                                     "Inode bitmap for group %d"
1465                                     " not in group (block %lu)!",
1466                                     i, (unsigned long)
1467                                         le32_to_cpu(gdp->bg_inode_bitmap));
1468                         return 0;
1469                 }
1470                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1471                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1472                     last_block)
1473                 {
1474                         ext3_error (sb, "ext3_check_descriptors",
1475                                     "Inode table for group %d"
1476                                     " not in group (block %lu)!",
1477                                     i, (unsigned long)
1478                                         le32_to_cpu(gdp->bg_inode_table));
1479                         return 0;
1480                 }
1481         }
1482 
1483         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1484         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1485         return 1;
1486 }
1487 
1488 
1489 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1490  * the superblock) which were deleted from all directories, but held open by
1491  * a process at the time of a crash.  We walk the list and try to delete these
1492  * inodes at recovery time (only with a read-write filesystem).
1493  *
1494  * In order to keep the orphan inode chain consistent during traversal (in
1495  * case of crash during recovery), we link each inode into the superblock
1496  * orphan list_head and handle it the same way as an inode deletion during
1497  * normal operation (which journals the operations for us).
1498  *
1499  * We only do an iget() and an iput() on each inode, which is very safe if we
1500  * accidentally point at an in-use or already deleted inode.  The worst that
1501  * can happen in this case is that we get a "bit already cleared" message from
1502  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1503  * e2fsck was run on this filesystem, and it must have already done the orphan
1504  * inode cleanup for us, so we can safely abort without any further action.
1505  */
1506 static void ext3_orphan_cleanup (struct super_block * sb,
1507                                  struct ext3_super_block * es)
1508 {
1509         unsigned int s_flags = sb->s_flags;
1510         int nr_orphans = 0, nr_truncates = 0;
1511 #ifdef CONFIG_QUOTA
1512         int i;
1513 #endif
1514         if (!es->s_last_orphan) {
1515                 jbd_debug(4, "no orphan inodes to clean up\n");
1516                 return;
1517         }
1518 
1519         if (bdev_read_only(sb->s_bdev)) {
1520                 ext3_msg(sb, KERN_ERR, "error: write access "
1521                         "unavailable, skipping orphan cleanup.");
1522                 return;
1523         }
1524 
1525         /* Check if feature set allows readwrite operations */
1526         if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1527                 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1528                          "unknown ROCOMPAT features");
1529                 return;
1530         }
1531 
1532         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1533                 /* don't clear list on RO mount w/ errors */
1534                 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
1535                         jbd_debug(1, "Errors on filesystem, "
1536                                   "clearing orphan list.\n");
1537                         es->s_last_orphan = 0;
1538                 }
1539                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1540                 return;
1541         }
1542 
1543         if (s_flags & MS_RDONLY) {
1544                 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1545                 sb->s_flags &= ~MS_RDONLY;
1546         }
1547 #ifdef CONFIG_QUOTA
1548         /* Needed for iput() to work correctly and not trash data */
1549         sb->s_flags |= MS_ACTIVE;
1550         /* Turn on quotas so that they are updated correctly */
1551         for (i = 0; i < MAXQUOTAS; i++) {
1552                 if (EXT3_SB(sb)->s_qf_names[i]) {
1553                         int ret = ext3_quota_on_mount(sb, i);
1554                         if (ret < 0)
1555                                 ext3_msg(sb, KERN_ERR,
1556                                         "error: cannot turn on journaled "
1557                                         "quota: %d", ret);
1558                 }
1559         }
1560 #endif
1561 
1562         while (es->s_last_orphan) {
1563                 struct inode *inode;
1564 
1565                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1566                 if (IS_ERR(inode)) {
1567                         es->s_last_orphan = 0;
1568                         break;
1569                 }
1570 
1571                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1572                 dquot_initialize(inode);
1573                 if (inode->i_nlink) {
1574                         printk(KERN_DEBUG
1575                                 "%s: truncating inode %lu to %Ld bytes\n",
1576                                 __func__, inode->i_ino, inode->i_size);
1577                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1578                                   inode->i_ino, inode->i_size);
1579                         ext3_truncate(inode);
1580                         nr_truncates++;
1581                 } else {
1582                         printk(KERN_DEBUG
1583                                 "%s: deleting unreferenced inode %lu\n",
1584                                 __func__, inode->i_ino);
1585                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1586                                   inode->i_ino);
1587                         nr_orphans++;
1588                 }
1589                 iput(inode);  /* The delete magic happens here! */
1590         }
1591 
1592 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1593 
1594         if (nr_orphans)
1595                 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1596                        PLURAL(nr_orphans));
1597         if (nr_truncates)
1598                 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1599                        PLURAL(nr_truncates));
1600 #ifdef CONFIG_QUOTA
1601         /* Turn quotas off */
1602         for (i = 0; i < MAXQUOTAS; i++) {
1603                 if (sb_dqopt(sb)->files[i])
1604                         dquot_quota_off(sb, i);
1605         }
1606 #endif
1607         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1608 }
1609 
1610 /*
1611  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1612  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1613  * We need to be 1 filesystem block less than the 2^32 sector limit.
1614  */
1615 static loff_t ext3_max_size(int bits)
1616 {
1617         loff_t res = EXT3_NDIR_BLOCKS;
1618         int meta_blocks;
1619         loff_t upper_limit;
1620 
1621         /* This is calculated to be the largest file size for a
1622          * dense, file such that the total number of
1623          * sectors in the file, including data and all indirect blocks,
1624          * does not exceed 2^32 -1
1625          * __u32 i_blocks representing the total number of
1626          * 512 bytes blocks of the file
1627          */
1628         upper_limit = (1LL << 32) - 1;
1629 
1630         /* total blocks in file system block size */
1631         upper_limit >>= (bits - 9);
1632 
1633 
1634         /* indirect blocks */
1635         meta_blocks = 1;
1636         /* double indirect blocks */
1637         meta_blocks += 1 + (1LL << (bits-2));
1638         /* tripple indirect blocks */
1639         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1640 
1641         upper_limit -= meta_blocks;
1642         upper_limit <<= bits;
1643 
1644         res += 1LL << (bits-2);
1645         res += 1LL << (2*(bits-2));
1646         res += 1LL << (3*(bits-2));
1647         res <<= bits;
1648         if (res > upper_limit)
1649                 res = upper_limit;
1650 
1651         if (res > MAX_LFS_FILESIZE)
1652                 res = MAX_LFS_FILESIZE;
1653 
1654         return res;
1655 }
1656 
1657 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1658                                     ext3_fsblk_t logic_sb_block,
1659                                     int nr)
1660 {
1661         struct ext3_sb_info *sbi = EXT3_SB(sb);
1662         unsigned long bg, first_meta_bg;
1663         int has_super = 0;
1664 
1665         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1666 
1667         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1668             nr < first_meta_bg)
1669                 return (logic_sb_block + nr + 1);
1670         bg = sbi->s_desc_per_block * nr;
1671         if (ext3_bg_has_super(sb, bg))
1672                 has_super = 1;
1673         return (has_super + ext3_group_first_block_no(sb, bg));
1674 }
1675 
1676 
1677 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1678 {
1679         struct buffer_head * bh;
1680         struct ext3_super_block *es = NULL;
1681         struct ext3_sb_info *sbi;
1682         ext3_fsblk_t block;
1683         ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1684         ext3_fsblk_t logic_sb_block;
1685         unsigned long offset = 0;
1686         unsigned int journal_inum = 0;
1687         unsigned long journal_devnum = 0;
1688         unsigned long def_mount_opts;
1689         struct inode *root;
1690         int blocksize;
1691         int hblock;
1692         int db_count;
1693         int i;
1694         int needs_recovery;
1695         int ret = -EINVAL;
1696         __le32 features;
1697         int err;
1698 
1699         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1700         if (!sbi)
1701                 return -ENOMEM;
1702 
1703         sbi->s_blockgroup_lock =
1704                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1705         if (!sbi->s_blockgroup_lock) {
1706                 kfree(sbi);
1707                 return -ENOMEM;
1708         }
1709         sb->s_fs_info = sbi;
1710         sbi->s_sb_block = sb_block;
1711 
1712         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1713         if (!blocksize) {
1714                 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1715                 goto out_fail;
1716         }
1717 
1718         /*
1719          * The ext3 superblock will not be buffer aligned for other than 1kB
1720          * block sizes.  We need to calculate the offset from buffer start.
1721          */
1722         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1723                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1724                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1725         } else {
1726                 logic_sb_block = sb_block;
1727         }
1728 
1729         if (!(bh = sb_bread(sb, logic_sb_block))) {
1730                 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1731                 goto out_fail;
1732         }
1733         /*
1734          * Note: s_es must be initialized as soon as possible because
1735          *       some ext3 macro-instructions depend on its value
1736          */
1737         es = (struct ext3_super_block *) (bh->b_data + offset);
1738         sbi->s_es = es;
1739         sb->s_magic = le16_to_cpu(es->s_magic);
1740         if (sb->s_magic != EXT3_SUPER_MAGIC)
1741                 goto cantfind_ext3;
1742 
1743         /* Set defaults before we parse the mount options */
1744         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1745         if (def_mount_opts & EXT3_DEFM_DEBUG)
1746                 set_opt(sbi->s_mount_opt, DEBUG);
1747         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1748                 set_opt(sbi->s_mount_opt, GRPID);
1749         if (def_mount_opts & EXT3_DEFM_UID16)
1750                 set_opt(sbi->s_mount_opt, NO_UID32);
1751 #ifdef CONFIG_EXT3_FS_XATTR
1752         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1753                 set_opt(sbi->s_mount_opt, XATTR_USER);
1754 #endif
1755 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1756         if (def_mount_opts & EXT3_DEFM_ACL)
1757                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1758 #endif
1759         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1760                 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1761         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1762                 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1763         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1764                 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1765 
1766         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1767                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1768         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1769                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1770         else
1771                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1772 
1773         sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
1774         sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
1775 
1776         /* enable barriers by default */
1777         set_opt(sbi->s_mount_opt, BARRIER);
1778         set_opt(sbi->s_mount_opt, RESERVATION);
1779 
1780         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1781                             NULL, 0))
1782                 goto failed_mount;
1783 
1784         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1785                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1786 
1787         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1788             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1789              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1790              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1791                 ext3_msg(sb, KERN_WARNING,
1792                         "warning: feature flags set on rev 0 fs, "
1793                         "running e2fsck is recommended");
1794         /*
1795          * Check feature flags regardless of the revision level, since we
1796          * previously didn't change the revision level when setting the flags,
1797          * so there is a chance incompat flags are set on a rev 0 filesystem.
1798          */
1799         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1800         if (features) {
1801                 ext3_msg(sb, KERN_ERR,
1802                         "error: couldn't mount because of unsupported "
1803                         "optional features (%x)", le32_to_cpu(features));
1804                 goto failed_mount;
1805         }
1806         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1807         if (!(sb->s_flags & MS_RDONLY) && features) {
1808                 ext3_msg(sb, KERN_ERR,
1809                         "error: couldn't mount RDWR because of unsupported "
1810                         "optional features (%x)", le32_to_cpu(features));
1811                 goto failed_mount;
1812         }
1813         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1814 
1815         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1816             blocksize > EXT3_MAX_BLOCK_SIZE) {
1817                 ext3_msg(sb, KERN_ERR,
1818                         "error: couldn't mount because of unsupported "
1819                         "filesystem blocksize %d", blocksize);
1820                 goto failed_mount;
1821         }
1822 
1823         hblock = bdev_logical_block_size(sb->s_bdev);
1824         if (sb->s_blocksize != blocksize) {
1825                 /*
1826                  * Make sure the blocksize for the filesystem is larger
1827                  * than the hardware sectorsize for the machine.
1828                  */
1829                 if (blocksize < hblock) {
1830                         ext3_msg(sb, KERN_ERR,
1831                                 "error: fsblocksize %d too small for "
1832                                 "hardware sectorsize %d", blocksize, hblock);
1833                         goto failed_mount;
1834                 }
1835 
1836                 brelse (bh);
1837                 if (!sb_set_blocksize(sb, blocksize)) {
1838                         ext3_msg(sb, KERN_ERR,
1839                                 "error: bad blocksize %d", blocksize);
1840                         goto out_fail;
1841                 }
1842                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1843                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1844                 bh = sb_bread(sb, logic_sb_block);
1845                 if (!bh) {
1846                         ext3_msg(sb, KERN_ERR,
1847                                "error: can't read superblock on 2nd try");
1848                         goto failed_mount;
1849                 }
1850                 es = (struct ext3_super_block *)(bh->b_data + offset);
1851                 sbi->s_es = es;
1852                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1853                         ext3_msg(sb, KERN_ERR,
1854                                 "error: magic mismatch");
1855                         goto failed_mount;
1856                 }
1857         }
1858 
1859         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1860 
1861         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1862                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1863                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1864         } else {
1865                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1866                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1867                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1868                     (!is_power_of_2(sbi->s_inode_size)) ||
1869                     (sbi->s_inode_size > blocksize)) {
1870                         ext3_msg(sb, KERN_ERR,
1871                                 "error: unsupported inode size: %d",
1872                                 sbi->s_inode_size);
1873                         goto failed_mount;
1874                 }
1875         }
1876         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1877                                    le32_to_cpu(es->s_log_frag_size);
1878         if (blocksize != sbi->s_frag_size) {
1879                 ext3_msg(sb, KERN_ERR,
1880                        "error: fragsize %lu != blocksize %u (unsupported)",
1881                        sbi->s_frag_size, blocksize);
1882                 goto failed_mount;
1883         }
1884         sbi->s_frags_per_block = 1;
1885         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1886         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1887         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1888         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1889                 goto cantfind_ext3;
1890         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1891         if (sbi->s_inodes_per_block == 0)
1892                 goto cantfind_ext3;
1893         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1894                                         sbi->s_inodes_per_block;
1895         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1896         sbi->s_sbh = bh;
1897         sbi->s_mount_state = le16_to_cpu(es->s_state);
1898         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1899         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1900         for (i=0; i < 4; i++)
1901                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1902         sbi->s_def_hash_version = es->s_def_hash_version;
1903         i = le32_to_cpu(es->s_flags);
1904         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1905                 sbi->s_hash_unsigned = 3;
1906         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1907 #ifdef __CHAR_UNSIGNED__
1908                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1909                 sbi->s_hash_unsigned = 3;
1910 #else
1911                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1912 #endif
1913         }
1914 
1915         if (sbi->s_blocks_per_group > blocksize * 8) {
1916                 ext3_msg(sb, KERN_ERR,
1917                         "#blocks per group too big: %lu",
1918                         sbi->s_blocks_per_group);
1919                 goto failed_mount;
1920         }
1921         if (sbi->s_frags_per_group > blocksize * 8) {
1922                 ext3_msg(sb, KERN_ERR,
1923                         "error: #fragments per group too big: %lu",
1924                         sbi->s_frags_per_group);
1925                 goto failed_mount;
1926         }
1927         if (sbi->s_inodes_per_group > blocksize * 8) {
1928                 ext3_msg(sb, KERN_ERR,
1929                         "error: #inodes per group too big: %lu",
1930                         sbi->s_inodes_per_group);
1931                 goto failed_mount;
1932         }
1933 
1934         err = generic_check_addressable(sb->s_blocksize_bits,
1935                                         le32_to_cpu(es->s_blocks_count));
1936         if (err) {
1937                 ext3_msg(sb, KERN_ERR,
1938                         "error: filesystem is too large to mount safely");
1939                 if (sizeof(sector_t) < 8)
1940                         ext3_msg(sb, KERN_ERR,
1941                                 "error: CONFIG_LBDAF not enabled");
1942                 ret = err;
1943                 goto failed_mount;
1944         }
1945 
1946         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1947                 goto cantfind_ext3;
1948         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1949                                le32_to_cpu(es->s_first_data_block) - 1)
1950                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1951         db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1952         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1953                                     GFP_KERNEL);
1954         if (sbi->s_group_desc == NULL) {
1955                 ext3_msg(sb, KERN_ERR,
1956                         "error: not enough memory");
1957                 ret = -ENOMEM;
1958                 goto failed_mount;
1959         }
1960 
1961         bgl_lock_init(sbi->s_blockgroup_lock);
1962 
1963         for (i = 0; i < db_count; i++) {
1964                 block = descriptor_loc(sb, logic_sb_block, i);
1965                 sbi->s_group_desc[i] = sb_bread(sb, block);
1966                 if (!sbi->s_group_desc[i]) {
1967                         ext3_msg(sb, KERN_ERR,
1968                                 "error: can't read group descriptor %d", i);
1969                         db_count = i;
1970                         goto failed_mount2;
1971                 }
1972         }
1973         if (!ext3_check_descriptors (sb)) {
1974                 ext3_msg(sb, KERN_ERR,
1975                         "error: group descriptors corrupted");
1976                 goto failed_mount2;
1977         }
1978         sbi->s_gdb_count = db_count;
1979         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1980         spin_lock_init(&sbi->s_next_gen_lock);
1981 
1982         /* per fileystem reservation list head & lock */
1983         spin_lock_init(&sbi->s_rsv_window_lock);
1984         sbi->s_rsv_window_root = RB_ROOT;
1985         /* Add a single, static dummy reservation to the start of the
1986          * reservation window list --- it gives us a placeholder for
1987          * append-at-start-of-list which makes the allocation logic
1988          * _much_ simpler. */
1989         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1990         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1991         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1992         sbi->s_rsv_window_head.rsv_goal_size = 0;
1993         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1994 
1995         /*
1996          * set up enough so that it can read an inode
1997          */
1998         sb->s_op = &ext3_sops;
1999         sb->s_export_op = &ext3_export_ops;
2000         sb->s_xattr = ext3_xattr_handlers;
2001 #ifdef CONFIG_QUOTA
2002         sb->s_qcop = &ext3_qctl_operations;
2003         sb->dq_op = &ext3_quota_operations;
2004 #endif
2005         memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
2006         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2007         mutex_init(&sbi->s_orphan_lock);
2008         mutex_init(&sbi->s_resize_lock);
2009 
2010         sb->s_root = NULL;
2011 
2012         needs_recovery = (es->s_last_orphan != 0 ||
2013                           EXT3_HAS_INCOMPAT_FEATURE(sb,
2014                                     EXT3_FEATURE_INCOMPAT_RECOVER));
2015 
2016         /*
2017          * The first inode we look at is the journal inode.  Don't try
2018          * root first: it may be modified in the journal!
2019          */
2020         if (!test_opt(sb, NOLOAD) &&
2021             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
2022                 if (ext3_load_journal(sb, es, journal_devnum))
2023                         goto failed_mount2;
2024         } else if (journal_inum) {
2025                 if (ext3_create_journal(sb, es, journal_inum))
2026                         goto failed_mount2;
2027         } else {
2028                 if (!silent)
2029                         ext3_msg(sb, KERN_ERR,
2030                                 "error: no journal found. "
2031                                 "mounting ext3 over ext2?");
2032                 goto failed_mount2;
2033         }
2034         err = percpu_counter_init(&sbi->s_freeblocks_counter,
2035                         ext3_count_free_blocks(sb));
2036         if (!err) {
2037                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2038                                 ext3_count_free_inodes(sb));
2039         }
2040         if (!err) {
2041                 err = percpu_counter_init(&sbi->s_dirs_counter,
2042                                 ext3_count_dirs(sb));
2043         }
2044         if (err) {
2045                 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
2046                 ret = err;
2047                 goto failed_mount3;
2048         }
2049 
2050         /* We have now updated the journal if required, so we can
2051          * validate the data journaling mode. */
2052         switch (test_opt(sb, DATA_FLAGS)) {
2053         case 0:
2054                 /* No mode set, assume a default based on the journal
2055                    capabilities: ORDERED_DATA if the journal can
2056                    cope, else JOURNAL_DATA */
2057                 if (journal_check_available_features
2058                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
2059                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
2060                 else
2061                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2062                 break;
2063 
2064         case EXT3_MOUNT_ORDERED_DATA:
2065         case EXT3_MOUNT_WRITEBACK_DATA:
2066                 if (!journal_check_available_features
2067                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2068                         ext3_msg(sb, KERN_ERR,
2069                                 "error: journal does not support "
2070                                 "requested data journaling mode");
2071                         goto failed_mount3;
2072                 }
2073         default:
2074                 break;
2075         }
2076 
2077         /*
2078          * The journal_load will have done any necessary log recovery,
2079          * so we can safely mount the rest of the filesystem now.
2080          */
2081 
2082         root = ext3_iget(sb, EXT3_ROOT_INO);
2083         if (IS_ERR(root)) {
2084                 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2085                 ret = PTR_ERR(root);
2086                 goto failed_mount3;
2087         }
2088         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2089                 iput(root);
2090                 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2091                 goto failed_mount3;
2092         }
2093         sb->s_root = d_make_root(root);
2094         if (!sb->s_root) {
2095                 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2096                 ret = -ENOMEM;
2097                 goto failed_mount3;
2098         }
2099 
2100         if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
2101                 sb->s_flags |= MS_RDONLY;
2102 
2103         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2104         ext3_orphan_cleanup(sb, es);
2105         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2106         if (needs_recovery) {
2107                 ext3_mark_recovery_complete(sb, es);
2108                 ext3_msg(sb, KERN_INFO, "recovery complete");
2109         }
2110         ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2111                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2112                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2113                 "writeback");
2114 
2115         return 0;
2116 
2117 cantfind_ext3:
2118         if (!silent)
2119                 ext3_msg(sb, KERN_INFO,
2120                         "error: can't find ext3 filesystem on dev %s.",
2121                        sb->s_id);
2122         goto failed_mount;
2123 
2124 failed_mount3:
2125         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2126         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2127         percpu_counter_destroy(&sbi->s_dirs_counter);
2128         journal_destroy(sbi->s_journal);
2129 failed_mount2:
2130         for (i = 0; i < db_count; i++)
2131                 brelse(sbi->s_group_desc[i]);
2132         kfree(sbi->s_group_desc);
2133 failed_mount:
2134 #ifdef CONFIG_QUOTA
2135         for (i = 0; i < MAXQUOTAS; i++)
2136                 kfree(sbi->s_qf_names[i]);
2137 #endif
2138         ext3_blkdev_remove(sbi);
2139         brelse(bh);
2140 out_fail:
2141         sb->s_fs_info = NULL;
2142         kfree(sbi->s_blockgroup_lock);
2143         kfree(sbi);
2144         return ret;
2145 }
2146 
2147 /*
2148  * Setup any per-fs journal parameters now.  We'll do this both on
2149  * initial mount, once the journal has been initialised but before we've
2150  * done any recovery; and again on any subsequent remount.
2151  */
2152 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2153 {
2154         struct ext3_sb_info *sbi = EXT3_SB(sb);
2155 
2156         if (sbi->s_commit_interval)
2157                 journal->j_commit_interval = sbi->s_commit_interval;
2158         /* We could also set up an ext3-specific default for the commit
2159          * interval here, but for now we'll just fall back to the jbd
2160          * default. */
2161 
2162         spin_lock(&journal->j_state_lock);
2163         if (test_opt(sb, BARRIER))
2164                 journal->j_flags |= JFS_BARRIER;
2165         else
2166                 journal->j_flags &= ~JFS_BARRIER;
2167         if (test_opt(sb, DATA_ERR_ABORT))
2168                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2169         else
2170                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2171         spin_unlock(&journal->j_state_lock);
2172 }
2173 
2174 static journal_t *ext3_get_journal(struct super_block *sb,
2175                                    unsigned int journal_inum)
2176 {
2177         struct inode *journal_inode;
2178         journal_t *journal;
2179 
2180         /* First, test for the existence of a valid inode on disk.  Bad
2181          * things happen if we iget() an unused inode, as the subsequent
2182          * iput() will try to delete it. */
2183 
2184         journal_inode = ext3_iget(sb, journal_inum);
2185         if (IS_ERR(journal_inode)) {
2186                 ext3_msg(sb, KERN_ERR, "error: no journal found");
2187                 return NULL;
2188         }
2189         if (!journal_inode->i_nlink) {
2190                 make_bad_inode(journal_inode);
2191                 iput(journal_inode);
2192                 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2193                 return NULL;
2194         }
2195 
2196         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2197                   journal_inode, journal_inode->i_size);
2198         if (!S_ISREG(journal_inode->i_mode)) {
2199                 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2200                 iput(journal_inode);
2201                 return NULL;
2202         }
2203 
2204         journal = journal_init_inode(journal_inode);
2205         if (!journal) {
2206                 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2207                 iput(journal_inode);
2208                 return NULL;
2209         }
2210         journal->j_private = sb;
2211         ext3_init_journal_params(sb, journal);
2212         return journal;
2213 }
2214 
2215 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2216                                        dev_t j_dev)
2217 {
2218         struct buffer_head * bh;
2219         journal_t *journal;
2220         ext3_fsblk_t start;
2221         ext3_fsblk_t len;
2222         int hblock, blocksize;
2223         ext3_fsblk_t sb_block;
2224         unsigned long offset;
2225         struct ext3_super_block * es;
2226         struct block_device *bdev;
2227 
2228         bdev = ext3_blkdev_get(j_dev, sb);
2229         if (bdev == NULL)
2230                 return NULL;
2231 
2232         blocksize = sb->s_blocksize;
2233         hblock = bdev_logical_block_size(bdev);
2234         if (blocksize < hblock) {
2235                 ext3_msg(sb, KERN_ERR,
2236                         "error: blocksize too small for journal device");
2237                 goto out_bdev;
2238         }
2239 
2240         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2241         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2242         set_blocksize(bdev, blocksize);
2243         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2244                 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2245                         "external journal");
2246                 goto out_bdev;
2247         }
2248 
2249         es = (struct ext3_super_block *) (bh->b_data + offset);
2250         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2251             !(le32_to_cpu(es->s_feature_incompat) &
2252               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2253                 ext3_msg(sb, KERN_ERR, "error: external journal has "
2254                         "bad superblock");
2255                 brelse(bh);
2256                 goto out_bdev;
2257         }
2258 
2259         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2260                 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2261                 brelse(bh);
2262                 goto out_bdev;
2263         }
2264 
2265         len = le32_to_cpu(es->s_blocks_count);
2266         start = sb_block + 1;
2267         brelse(bh);     /* we're done with the superblock */
2268 
2269         journal = journal_init_dev(bdev, sb->s_bdev,
2270                                         start, len, blocksize);
2271         if (!journal) {
2272                 ext3_msg(sb, KERN_ERR,
2273                         "error: failed to create device journal");
2274                 goto out_bdev;
2275         }
2276         journal->j_private = sb;
2277         if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2278                 if (bh_submit_read(journal->j_sb_buffer)) {
2279                         ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2280                         goto out_journal;
2281                 }
2282         }
2283         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2284                 ext3_msg(sb, KERN_ERR,
2285                         "error: external journal has more than one "
2286                         "user (unsupported) - %d",
2287                         be32_to_cpu(journal->j_superblock->s_nr_users));
2288                 goto out_journal;
2289         }
2290         EXT3_SB(sb)->journal_bdev = bdev;
2291         ext3_init_journal_params(sb, journal);
2292         return journal;
2293 out_journal:
2294         journal_destroy(journal);
2295 out_bdev:
2296         ext3_blkdev_put(bdev);
2297         return NULL;
2298 }
2299 
2300 static int ext3_load_journal(struct super_block *sb,
2301                              struct ext3_super_block *es,
2302                              unsigned long journal_devnum)
2303 {
2304         journal_t *journal;
2305         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2306         dev_t journal_dev;
2307         int err = 0;
2308         int really_read_only;
2309 
2310         if (journal_devnum &&
2311             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2312                 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2313                         "numbers have changed");
2314                 journal_dev = new_decode_dev(journal_devnum);
2315         } else
2316                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2317 
2318         really_read_only = bdev_read_only(sb->s_bdev);
2319 
2320         /*
2321          * Are we loading a blank journal or performing recovery after a
2322          * crash?  For recovery, we need to check in advance whether we
2323          * can get read-write access to the device.
2324          */
2325 
2326         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2327                 if (sb->s_flags & MS_RDONLY) {
2328                         ext3_msg(sb, KERN_INFO,
2329                                 "recovery required on readonly filesystem");
2330                         if (really_read_only) {
2331                                 ext3_msg(sb, KERN_ERR, "error: write access "
2332                                         "unavailable, cannot proceed");
2333                                 return -EROFS;
2334                         }
2335                         ext3_msg(sb, KERN_INFO,
2336                                 "write access will be enabled during recovery");
2337                 }
2338         }
2339 
2340         if (journal_inum && journal_dev) {
2341                 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2342                        "and inode journals");
2343                 return -EINVAL;
2344         }
2345 
2346         if (journal_inum) {
2347                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2348                         return -EINVAL;
2349         } else {
2350                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2351                         return -EINVAL;
2352         }
2353 
2354         if (!(journal->j_flags & JFS_BARRIER))
2355                 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2356 
2357         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2358                 err = journal_update_format(journal);
2359                 if (err)  {
2360                         ext3_msg(sb, KERN_ERR, "error updating journal");
2361                         journal_destroy(journal);
2362                         return err;
2363                 }
2364         }
2365 
2366         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2367                 err = journal_wipe(journal, !really_read_only);
2368         if (!err)
2369                 err = journal_load(journal);
2370 
2371         if (err) {
2372                 ext3_msg(sb, KERN_ERR, "error loading journal");
2373                 journal_destroy(journal);
2374                 return err;
2375         }
2376 
2377         EXT3_SB(sb)->s_journal = journal;
2378         ext3_clear_journal_err(sb, es);
2379 
2380         if (!really_read_only && journal_devnum &&
2381             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2382                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2383 
2384                 /* Make sure we flush the recovery flag to disk. */
2385                 ext3_commit_super(sb, es, 1);
2386         }
2387 
2388         return 0;
2389 }
2390 
2391 static int ext3_create_journal(struct super_block *sb,
2392                                struct ext3_super_block *es,
2393                                unsigned int journal_inum)
2394 {
2395         journal_t *journal;
2396         int err;
2397 
2398         if (sb->s_flags & MS_RDONLY) {
2399                 ext3_msg(sb, KERN_ERR,
2400                         "error: readonly filesystem when trying to "
2401                         "create journal");
2402                 return -EROFS;
2403         }
2404 
2405         journal = ext3_get_journal(sb, journal_inum);
2406         if (!journal)
2407                 return -EINVAL;
2408 
2409         ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2410                journal_inum);
2411 
2412         err = journal_create(journal);
2413         if (err) {
2414                 ext3_msg(sb, KERN_ERR, "error creating journal");
2415                 journal_destroy(journal);
2416                 return -EIO;
2417         }
2418 
2419         EXT3_SB(sb)->s_journal = journal;
2420 
2421         ext3_update_dynamic_rev(sb);
2422         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2423         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2424 
2425         es->s_journal_inum = cpu_to_le32(journal_inum);
2426 
2427         /* Make sure we flush the recovery flag to disk. */
2428         ext3_commit_super(sb, es, 1);
2429 
2430         return 0;
2431 }
2432 
2433 static int ext3_commit_super(struct super_block *sb,
2434                                struct ext3_super_block *es,
2435                                int sync)
2436 {
2437         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2438         int error = 0;
2439 
2440         if (!sbh)
2441                 return error;
2442 
2443         if (buffer_write_io_error(sbh)) {
2444                 /*
2445                  * Oh, dear.  A previous attempt to write the
2446                  * superblock failed.  This could happen because the
2447                  * USB device was yanked out.  Or it could happen to
2448                  * be a transient write error and maybe the block will
2449                  * be remapped.  Nothing we can do but to retry the
2450                  * write and hope for the best.
2451                  */
2452                 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2453                        "superblock detected");
2454                 clear_buffer_write_io_error(sbh);
2455                 set_buffer_uptodate(sbh);
2456         }
2457         /*
2458          * If the file system is mounted read-only, don't update the
2459          * superblock write time.  This avoids updating the superblock
2460          * write time when we are mounting the root file system
2461          * read/only but we need to replay the journal; at that point,
2462          * for people who are east of GMT and who make their clock
2463          * tick in localtime for Windows bug-for-bug compatibility,
2464          * the clock is set in the future, and this will cause e2fsck
2465          * to complain and force a full file system check.
2466          */
2467         if (!(sb->s_flags & MS_RDONLY))
2468                 es->s_wtime = cpu_to_le32(get_seconds());
2469         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2470         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2471         BUFFER_TRACE(sbh, "marking dirty");
2472         mark_buffer_dirty(sbh);
2473         if (sync) {
2474                 error = sync_dirty_buffer(sbh);
2475                 if (buffer_write_io_error(sbh)) {
2476                         ext3_msg(sb, KERN_ERR, "I/O error while writing "
2477                                "superblock");
2478                         clear_buffer_write_io_error(sbh);
2479                         set_buffer_uptodate(sbh);
2480                 }
2481         }
2482         return error;
2483 }
2484 
2485 
2486 /*
2487  * Have we just finished recovery?  If so, and if we are mounting (or
2488  * remounting) the filesystem readonly, then we will end up with a
2489  * consistent fs on disk.  Record that fact.
2490  */
2491 static void ext3_mark_recovery_complete(struct super_block * sb,
2492                                         struct ext3_super_block * es)
2493 {
2494         journal_t *journal = EXT3_SB(sb)->s_journal;
2495 
2496         journal_lock_updates(journal);
2497         if (journal_flush(journal) < 0)
2498                 goto out;
2499 
2500         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2501             sb->s_flags & MS_RDONLY) {
2502                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2503                 ext3_commit_super(sb, es, 1);
2504         }
2505 
2506 out:
2507         journal_unlock_updates(journal);
2508 }
2509 
2510 /*
2511  * If we are mounting (or read-write remounting) a filesystem whose journal
2512  * has recorded an error from a previous lifetime, move that error to the
2513  * main filesystem now.
2514  */
2515 static void ext3_clear_journal_err(struct super_block *sb,
2516                                    struct ext3_super_block *es)
2517 {
2518         journal_t *journal;
2519         int j_errno;
2520         const char *errstr;
2521 
2522         journal = EXT3_SB(sb)->s_journal;
2523 
2524         /*
2525          * Now check for any error status which may have been recorded in the
2526          * journal by a prior ext3_error() or ext3_abort()
2527          */
2528 
2529         j_errno = journal_errno(journal);
2530         if (j_errno) {
2531                 char nbuf[16];
2532 
2533                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2534                 ext3_warning(sb, __func__, "Filesystem error recorded "
2535                              "from previous mount: %s", errstr);
2536                 ext3_warning(sb, __func__, "Marking fs in need of "
2537                              "filesystem check.");
2538 
2539                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2540                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2541                 ext3_commit_super (sb, es, 1);
2542 
2543                 journal_clear_err(journal);
2544         }
2545 }
2546 
2547 /*
2548  * Force the running and committing transactions to commit,
2549  * and wait on the commit.
2550  */
2551 int ext3_force_commit(struct super_block *sb)
2552 {
2553         journal_t *journal;
2554         int ret;
2555 
2556         if (sb->s_flags & MS_RDONLY)
2557                 return 0;
2558 
2559         journal = EXT3_SB(sb)->s_journal;
2560         ret = ext3_journal_force_commit(journal);
2561         return ret;
2562 }
2563 
2564 static int ext3_sync_fs(struct super_block *sb, int wait)
2565 {
2566         tid_t target;
2567 
2568         trace_ext3_sync_fs(sb, wait);
2569         /*
2570          * Writeback quota in non-journalled quota case - journalled quota has
2571          * no dirty dquots
2572          */
2573         dquot_writeback_dquots(sb, -1);
2574         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2575                 if (wait)
2576                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2577         }
2578         return 0;
2579 }
2580 
2581 /*
2582  * LVM calls this function before a (read-only) snapshot is created.  This
2583  * gives us a chance to flush the journal completely and mark the fs clean.
2584  */
2585 static int ext3_freeze(struct super_block *sb)
2586 {
2587         int error = 0;
2588         journal_t *journal;
2589 
2590         if (!(sb->s_flags & MS_RDONLY)) {
2591                 journal = EXT3_SB(sb)->s_journal;
2592 
2593                 /* Now we set up the journal barrier. */
2594                 journal_lock_updates(journal);
2595 
2596                 /*
2597                  * We don't want to clear needs_recovery flag when we failed
2598                  * to flush the journal.
2599                  */
2600                 error = journal_flush(journal);
2601                 if (error < 0)
2602                         goto out;
2603 
2604                 /* Journal blocked and flushed, clear needs_recovery flag. */
2605                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2606                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2607                 if (error)
2608                         goto out;
2609         }
2610         return 0;
2611 
2612 out:
2613         journal_unlock_updates(journal);
2614         return error;
2615 }
2616 
2617 /*
2618  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2619  * flag here, even though the filesystem is not technically dirty yet.
2620  */
2621 static int ext3_unfreeze(struct super_block *sb)
2622 {
2623         if (!(sb->s_flags & MS_RDONLY)) {
2624                 /* Reser the needs_recovery flag before the fs is unlocked. */
2625                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2626                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2627                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2628         }
2629         return 0;
2630 }
2631 
2632 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2633 {
2634         struct ext3_super_block * es;
2635         struct ext3_sb_info *sbi = EXT3_SB(sb);
2636         ext3_fsblk_t n_blocks_count = 0;
2637         unsigned long old_sb_flags;
2638         struct ext3_mount_options old_opts;
2639         int enable_quota = 0;
2640         int err;
2641 #ifdef CONFIG_QUOTA
2642         int i;
2643 #endif
2644 
2645         /* Store the original options */
2646         old_sb_flags = sb->s_flags;
2647         old_opts.s_mount_opt = sbi->s_mount_opt;
2648         old_opts.s_resuid = sbi->s_resuid;
2649         old_opts.s_resgid = sbi->s_resgid;
2650         old_opts.s_commit_interval = sbi->s_commit_interval;
2651 #ifdef CONFIG_QUOTA
2652         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2653         for (i = 0; i < MAXQUOTAS; i++)
2654                 if (sbi->s_qf_names[i]) {
2655                         old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
2656                                                          GFP_KERNEL);
2657                         if (!old_opts.s_qf_names[i]) {
2658                                 int j;
2659 
2660                                 for (j = 0; j < i; j++)
2661                                         kfree(old_opts.s_qf_names[j]);
2662                                 return -ENOMEM;
2663                         }
2664                 } else
2665                         old_opts.s_qf_names[i] = NULL;
2666 #endif
2667 
2668         /*
2669          * Allow the "check" option to be passed as a remount option.
2670          */
2671         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2672                 err = -EINVAL;
2673                 goto restore_opts;
2674         }
2675 
2676         if (test_opt(sb, ABORT))
2677                 ext3_abort(sb, __func__, "Abort forced by user");
2678 
2679         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2680                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2681 
2682         es = sbi->s_es;
2683 
2684         ext3_init_journal_params(sb, sbi->s_journal);
2685 
2686         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2687                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2688                 if (test_opt(sb, ABORT)) {
2689                         err = -EROFS;
2690                         goto restore_opts;
2691                 }
2692 
2693                 if (*flags & MS_RDONLY) {
2694                         err = dquot_suspend(sb, -1);
2695                         if (err < 0)
2696                                 goto restore_opts;
2697 
2698                         /*
2699                          * First of all, the unconditional stuff we have to do
2700                          * to disable replay of the journal when we next remount
2701                          */
2702                         sb->s_flags |= MS_RDONLY;
2703 
2704                         /*
2705                          * OK, test if we are remounting a valid rw partition
2706                          * readonly, and if so set the rdonly flag and then
2707                          * mark the partition as valid again.
2708                          */
2709                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2710                             (sbi->s_mount_state & EXT3_VALID_FS))
2711                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2712 
2713                         ext3_mark_recovery_complete(sb, es);
2714                 } else {
2715                         __le32 ret;
2716                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2717                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2718                                 ext3_msg(sb, KERN_WARNING,
2719                                         "warning: couldn't remount RDWR "
2720                                         "because of unsupported optional "
2721                                         "features (%x)", le32_to_cpu(ret));
2722                                 err = -EROFS;
2723                                 goto restore_opts;
2724                         }
2725 
2726                         /*
2727                          * If we have an unprocessed orphan list hanging
2728                          * around from a previously readonly bdev mount,
2729                          * require a full umount & mount for now.
2730                          */
2731                         if (es->s_last_orphan) {
2732                                 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2733                                        "remount RDWR because of unprocessed "
2734                                        "orphan inode list.  Please "
2735                                        "umount & mount instead.");
2736                                 err = -EINVAL;
2737                                 goto restore_opts;
2738                         }
2739 
2740                         /*
2741                          * Mounting a RDONLY partition read-write, so reread
2742                          * and store the current valid flag.  (It may have
2743                          * been changed by e2fsck since we originally mounted
2744                          * the partition.)
2745                          */
2746                         ext3_clear_journal_err(sb, es);
2747                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2748                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2749                                 goto restore_opts;
2750                         if (!ext3_setup_super (sb, es, 0))
2751                                 sb->s_flags &= ~MS_RDONLY;
2752                         enable_quota = 1;
2753                 }
2754         }
2755 #ifdef CONFIG_QUOTA
2756         /* Release old quota file names */
2757         for (i = 0; i < MAXQUOTAS; i++)
2758                 kfree(old_opts.s_qf_names[i]);
2759 #endif
2760         if (enable_quota)
2761                 dquot_resume(sb, -1);
2762         return 0;
2763 restore_opts:
2764         sb->s_flags = old_sb_flags;
2765         sbi->s_mount_opt = old_opts.s_mount_opt;
2766         sbi->s_resuid = old_opts.s_resuid;
2767         sbi->s_resgid = old_opts.s_resgid;
2768         sbi->s_commit_interval = old_opts.s_commit_interval;
2769 #ifdef CONFIG_QUOTA
2770         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2771         for (i = 0; i < MAXQUOTAS; i++) {
2772                 kfree(sbi->s_qf_names[i]);
2773                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2774         }
2775 #endif
2776         return err;
2777 }
2778 
2779 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2780 {
2781         struct super_block *sb = dentry->d_sb;
2782         struct ext3_sb_info *sbi = EXT3_SB(sb);
2783         struct ext3_super_block *es = sbi->s_es;
2784         u64 fsid;
2785 
2786         if (test_opt(sb, MINIX_DF)) {
2787                 sbi->s_overhead_last = 0;
2788         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2789                 unsigned long ngroups = sbi->s_groups_count, i;
2790                 ext3_fsblk_t overhead = 0;
2791                 smp_rmb();
2792 
2793                 /*
2794                  * Compute the overhead (FS structures).  This is constant
2795                  * for a given filesystem unless the number of block groups
2796                  * changes so we cache the previous value until it does.
2797                  */
2798 
2799                 /*
2800                  * All of the blocks before first_data_block are
2801                  * overhead
2802                  */
2803                 overhead = le32_to_cpu(es->s_first_data_block);
2804 
2805                 /*
2806                  * Add the overhead attributed to the superblock and
2807                  * block group descriptors.  If the sparse superblocks
2808                  * feature is turned on, then not all groups have this.
2809                  */
2810                 for (i = 0; i < ngroups; i++) {
2811                         overhead += ext3_bg_has_super(sb, i) +
2812                                 ext3_bg_num_gdb(sb, i);
2813                         cond_resched();
2814                 }
2815 
2816                 /*
2817                  * Every block group has an inode bitmap, a block
2818                  * bitmap, and an inode table.
2819                  */
2820                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2821 
2822                 /* Add the journal blocks as well */
2823                 overhead += sbi->s_journal->j_maxlen;
2824 
2825                 sbi->s_overhead_last = overhead;
2826                 smp_wmb();
2827                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2828         }
2829 
2830         buf->f_type = EXT3_SUPER_MAGIC;
2831         buf->f_bsize = sb->s_blocksize;
2832         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2833         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2834         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2835         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2836                 buf->f_bavail = 0;
2837         buf->f_files = le32_to_cpu(es->s_inodes_count);
2838         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2839         buf->f_namelen = EXT3_NAME_LEN;
2840         fsid = le64_to_cpup((void *)es->s_uuid) ^
2841                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2842         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2843         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2844         return 0;
2845 }
2846 
2847 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2848  * is locked for write. Otherwise the are possible deadlocks:
2849  * Process 1                         Process 2
2850  * ext3_create()                     quota_sync()
2851  *   journal_start()                   write_dquot()
2852  *   dquot_initialize()                       down(dqio_mutex)
2853  *     down(dqio_mutex)                    journal_start()
2854  *
2855  */
2856 
2857 #ifdef CONFIG_QUOTA
2858 
2859 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2860 {
2861         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
2862 }
2863 
2864 static int ext3_write_dquot(struct dquot *dquot)
2865 {
2866         int ret, err;
2867         handle_t *handle;
2868         struct inode *inode;
2869 
2870         inode = dquot_to_inode(dquot);
2871         handle = ext3_journal_start(inode,
2872                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2873         if (IS_ERR(handle))
2874                 return PTR_ERR(handle);
2875         ret = dquot_commit(dquot);
2876         err = ext3_journal_stop(handle);
2877         if (!ret)
2878                 ret = err;
2879         return ret;
2880 }
2881 
2882 static int ext3_acquire_dquot(struct dquot *dquot)
2883 {
2884         int ret, err;
2885         handle_t *handle;
2886 
2887         handle = ext3_journal_start(dquot_to_inode(dquot),
2888                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2889         if (IS_ERR(handle))
2890                 return PTR_ERR(handle);
2891         ret = dquot_acquire(dquot);
2892         err = ext3_journal_stop(handle);
2893         if (!ret)
2894                 ret = err;
2895         return ret;
2896 }
2897 
2898 static int ext3_release_dquot(struct dquot *dquot)
2899 {
2900         int ret, err;
2901         handle_t *handle;
2902 
2903         handle = ext3_journal_start(dquot_to_inode(dquot),
2904                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2905         if (IS_ERR(handle)) {
2906                 /* Release dquot anyway to avoid endless cycle in dqput() */
2907                 dquot_release(dquot);
2908                 return PTR_ERR(handle);
2909         }
2910         ret = dquot_release(dquot);
2911         err = ext3_journal_stop(handle);
2912         if (!ret)
2913                 ret = err;
2914         return ret;
2915 }
2916 
2917 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2918 {
2919         /* Are we journaling quotas? */
2920         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2921             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2922                 dquot_mark_dquot_dirty(dquot);
2923                 return ext3_write_dquot(dquot);
2924         } else {
2925                 return dquot_mark_dquot_dirty(dquot);
2926         }
2927 }
2928 
2929 static int ext3_write_info(struct super_block *sb, int type)
2930 {
2931         int ret, err;
2932         handle_t *handle;
2933 
2934         /* Data block + inode block */
2935         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2936         if (IS_ERR(handle))
2937                 return PTR_ERR(handle);
2938         ret = dquot_commit_info(sb, type);
2939         err = ext3_journal_stop(handle);
2940         if (!ret)
2941                 ret = err;
2942         return ret;
2943 }
2944 
2945 /*
2946  * Turn on quotas during mount time - we need to find
2947  * the quota file and such...
2948  */
2949 static int ext3_quota_on_mount(struct super_block *sb, int type)
2950 {
2951         return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2952                                         EXT3_SB(sb)->s_jquota_fmt, type);
2953 }
2954 
2955 /*
2956  * Standard function to be called on quota_on
2957  */
2958 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2959                          struct path *path)
2960 {
2961         int err;
2962 
2963         if (!test_opt(sb, QUOTA))
2964                 return -EINVAL;
2965 
2966         /* Quotafile not on the same filesystem? */
2967         if (path->dentry->d_sb != sb)
2968                 return -EXDEV;
2969         /* Journaling quota? */
2970         if (EXT3_SB(sb)->s_qf_names[type]) {
2971                 /* Quotafile not of fs root? */
2972                 if (path->dentry->d_parent != sb->s_root)
2973                         ext3_msg(sb, KERN_WARNING,
2974                                 "warning: Quota file not on filesystem root. "
2975                                 "Journaled quota will not work.");
2976         }
2977 
2978         /*
2979          * When we journal data on quota file, we have to flush journal to see
2980          * all updates to the file when we bypass pagecache...
2981          */
2982         if (ext3_should_journal_data(path->dentry->d_inode)) {
2983                 /*
2984                  * We don't need to lock updates but journal_flush() could
2985                  * otherwise be livelocked...
2986                  */
2987                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2988                 err = journal_flush(EXT3_SB(sb)->s_journal);
2989                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2990                 if (err)
2991                         return err;
2992         }
2993 
2994         return dquot_quota_on(sb, type, format_id, path);
2995 }
2996 
2997 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2998  * acquiring the locks... As quota files are never truncated and quota code
2999  * itself serializes the operations (and no one else should touch the files)
3000  * we don't have to be afraid of races */
3001 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
3002                                size_t len, loff_t off)
3003 {
3004         struct inode *inode = sb_dqopt(sb)->files[type];
3005         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
3006         int err = 0;
3007         int offset = off & (sb->s_blocksize - 1);
3008         int tocopy;
3009         size_t toread;
3010         struct buffer_head *bh;
3011         loff_t i_size = i_size_read(inode);
3012 
3013         if (off > i_size)
3014                 return 0;
3015         if (off+len > i_size)
3016                 len = i_size-off;
3017         toread = len;
3018         while (toread > 0) {
3019                 tocopy = sb->s_blocksize - offset < toread ?
3020                                 sb->s_blocksize - offset : toread;
3021                 bh = ext3_bread(NULL, inode, blk, 0, &err);
3022                 if (err)
3023                         return err;
3024                 if (!bh)        /* A hole? */
3025                         memset(data, 0, tocopy);
3026                 else
3027                         memcpy(data, bh->b_data+offset, tocopy);
3028                 brelse(bh);
3029                 offset = 0;
3030                 toread -= tocopy;
3031                 data += tocopy;
3032                 blk++;
3033         }
3034         return len;
3035 }
3036 
3037 /* Write to quotafile (we know the transaction is already started and has
3038  * enough credits) */
3039 static ssize_t ext3_quota_write(struct super_block *sb, int type,
3040                                 const char *data, size_t len, loff_t off)
3041 {
3042         struct inode *inode = sb_dqopt(sb)->files[type];
3043         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
3044         int err = 0;
3045         int offset = off & (sb->s_blocksize - 1);
3046         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
3047         struct buffer_head *bh;
3048         handle_t *handle = journal_current_handle();
3049 
3050         if (!handle) {
3051                 ext3_msg(sb, KERN_WARNING,
3052                         "warning: quota write (off=%llu, len=%llu)"
3053                         " cancelled because transaction is not started.",
3054                         (unsigned long long)off, (unsigned long long)len);
3055                 return -EIO;
3056         }
3057 
3058         /*
3059          * Since we account only one data block in transaction credits,
3060          * then it is impossible to cross a block boundary.
3061          */
3062         if (sb->s_blocksize - offset < len) {
3063                 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3064                         " cancelled because not block aligned",
3065                         (unsigned long long)off, (unsigned long long)len);
3066                 return -EIO;
3067         }
3068         bh = ext3_bread(handle, inode, blk, 1, &err);
3069         if (!bh)
3070                 goto out;
3071         if (journal_quota) {
3072                 err = ext3_journal_get_write_access(handle, bh);
3073                 if (err) {
3074                         brelse(bh);
3075                         goto out;
3076                 }
3077         }
3078         lock_buffer(bh);
3079         memcpy(bh->b_data+offset, data, len);
3080         flush_dcache_page(bh->b_page);
3081         unlock_buffer(bh);
3082         if (journal_quota)
3083                 err = ext3_journal_dirty_metadata(handle, bh);
3084         else {
3085                 /* Always do at least ordered writes for quotas */
3086                 err = ext3_journal_dirty_data(handle, bh);
3087                 mark_buffer_dirty(bh);
3088         }
3089         brelse(bh);
3090 out:
3091         if (err)
3092                 return err;
3093         if (inode->i_size < off + len) {
3094                 i_size_write(inode, off + len);
3095                 EXT3_I(inode)->i_disksize = inode->i_size;
3096         }
3097         inode->i_version++;
3098         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3099         ext3_mark_inode_dirty(handle, inode);
3100         return len;
3101 }
3102 
3103 #endif
3104 
3105 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3106         int flags, const char *dev_name, void *data)
3107 {
3108         return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3109 }
3110 
3111 static struct file_system_type ext3_fs_type = {
3112         .owner          = THIS_MODULE,
3113         .name           = "ext3",
3114         .mount          = ext3_mount,
3115         .kill_sb        = kill_block_super,
3116         .fs_flags       = FS_REQUIRES_DEV,
3117 };
3118 MODULE_ALIAS_FS("ext3");
3119 
3120 static int __init init_ext3_fs(void)
3121 {
3122         int err = init_ext3_xattr();
3123         if (err)
3124                 return err;
3125         err = init_inodecache();
3126         if (err)
3127                 goto out1;
3128         err = register_filesystem(&ext3_fs_type);
3129         if (err)
3130                 goto out;
3131         return 0;
3132 out:
3133         destroy_inodecache();
3134 out1:
3135         exit_ext3_xattr();
3136         return err;
3137 }
3138 
3139 static void __exit exit_ext3_fs(void)
3140 {
3141         unregister_filesystem(&ext3_fs_type);
3142         destroy_inodecache();
3143         exit_ext3_xattr();
3144 }
3145 
3146 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3147 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3148 MODULE_LICENSE("GPL");
3149 module_init(init_ext3_fs)
3150 module_exit(exit_ext3_fs)
3151 

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