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

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  1 /*
  2  *  linux/fs/affs/inode.c
  3  *
  4  *  (c) 1996  Hans-Joachim Widmaier - Rewritten
  5  *
  6  *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
  7  *
  8  *  (C) 1992  Eric Youngdale Modified for ISO 9660 filesystem.
  9  *
 10  *  (C) 1991  Linus Torvalds - minix filesystem
 11  */
 12 
 13 #include <linux/module.h>
 14 #include <linux/init.h>
 15 #include <linux/statfs.h>
 16 #include <linux/parser.h>
 17 #include <linux/magic.h>
 18 #include <linux/sched.h>
 19 #include <linux/cred.h>
 20 #include <linux/slab.h>
 21 #include <linux/writeback.h>
 22 #include <linux/blkdev.h>
 23 #include <linux/seq_file.h>
 24 #include <linux/iversion.h>
 25 #include "affs.h"
 26 
 27 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
 28 static int affs_show_options(struct seq_file *m, struct dentry *root);
 29 static int affs_remount (struct super_block *sb, int *flags, char *data);
 30 
 31 static void
 32 affs_commit_super(struct super_block *sb, int wait)
 33 {
 34         struct affs_sb_info *sbi = AFFS_SB(sb);
 35         struct buffer_head *bh = sbi->s_root_bh;
 36         struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
 37 
 38         lock_buffer(bh);
 39         affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
 40         affs_fix_checksum(sb, bh);
 41         unlock_buffer(bh);
 42 
 43         mark_buffer_dirty(bh);
 44         if (wait)
 45                 sync_dirty_buffer(bh);
 46 }
 47 
 48 static void
 49 affs_put_super(struct super_block *sb)
 50 {
 51         struct affs_sb_info *sbi = AFFS_SB(sb);
 52         pr_debug("%s()\n", __func__);
 53 
 54         cancel_delayed_work_sync(&sbi->sb_work);
 55 }
 56 
 57 static int
 58 affs_sync_fs(struct super_block *sb, int wait)
 59 {
 60         affs_commit_super(sb, wait);
 61         return 0;
 62 }
 63 
 64 static void flush_superblock(struct work_struct *work)
 65 {
 66         struct affs_sb_info *sbi;
 67         struct super_block *sb;
 68 
 69         sbi = container_of(work, struct affs_sb_info, sb_work.work);
 70         sb = sbi->sb;
 71 
 72         spin_lock(&sbi->work_lock);
 73         sbi->work_queued = 0;
 74         spin_unlock(&sbi->work_lock);
 75 
 76         affs_commit_super(sb, 1);
 77 }
 78 
 79 void affs_mark_sb_dirty(struct super_block *sb)
 80 {
 81         struct affs_sb_info *sbi = AFFS_SB(sb);
 82         unsigned long delay;
 83 
 84         if (sb_rdonly(sb))
 85                return;
 86 
 87         spin_lock(&sbi->work_lock);
 88         if (!sbi->work_queued) {
 89                delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 90                queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
 91                sbi->work_queued = 1;
 92         }
 93         spin_unlock(&sbi->work_lock);
 94 }
 95 
 96 static struct kmem_cache * affs_inode_cachep;
 97 
 98 static struct inode *affs_alloc_inode(struct super_block *sb)
 99 {
100         struct affs_inode_info *i;
101 
102         i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
103         if (!i)
104                 return NULL;
105 
106         inode_set_iversion(&i->vfs_inode, 1);
107         i->i_lc = NULL;
108         i->i_ext_bh = NULL;
109         i->i_pa_cnt = 0;
110 
111         return &i->vfs_inode;
112 }
113 
114 static void affs_i_callback(struct rcu_head *head)
115 {
116         struct inode *inode = container_of(head, struct inode, i_rcu);
117         kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
118 }
119 
120 static void affs_destroy_inode(struct inode *inode)
121 {
122         call_rcu(&inode->i_rcu, affs_i_callback);
123 }
124 
125 static void init_once(void *foo)
126 {
127         struct affs_inode_info *ei = (struct affs_inode_info *) foo;
128 
129         sema_init(&ei->i_link_lock, 1);
130         sema_init(&ei->i_ext_lock, 1);
131         inode_init_once(&ei->vfs_inode);
132 }
133 
134 static int __init init_inodecache(void)
135 {
136         affs_inode_cachep = kmem_cache_create("affs_inode_cache",
137                                              sizeof(struct affs_inode_info),
138                                              0, (SLAB_RECLAIM_ACCOUNT|
139                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
140                                              init_once);
141         if (affs_inode_cachep == NULL)
142                 return -ENOMEM;
143         return 0;
144 }
145 
146 static void destroy_inodecache(void)
147 {
148         /*
149          * Make sure all delayed rcu free inodes are flushed before we
150          * destroy cache.
151          */
152         rcu_barrier();
153         kmem_cache_destroy(affs_inode_cachep);
154 }
155 
156 static const struct super_operations affs_sops = {
157         .alloc_inode    = affs_alloc_inode,
158         .destroy_inode  = affs_destroy_inode,
159         .write_inode    = affs_write_inode,
160         .evict_inode    = affs_evict_inode,
161         .put_super      = affs_put_super,
162         .sync_fs        = affs_sync_fs,
163         .statfs         = affs_statfs,
164         .remount_fs     = affs_remount,
165         .show_options   = affs_show_options,
166 };
167 
168 enum {
169         Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
170         Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
171         Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
172 };
173 
174 static const match_table_t tokens = {
175         {Opt_bs, "bs=%u"},
176         {Opt_mode, "mode=%o"},
177         {Opt_mufs, "mufs"},
178         {Opt_notruncate, "nofilenametruncate"},
179         {Opt_prefix, "prefix=%s"},
180         {Opt_protect, "protect"},
181         {Opt_reserved, "reserved=%u"},
182         {Opt_root, "root=%u"},
183         {Opt_setgid, "setgid=%u"},
184         {Opt_setuid, "setuid=%u"},
185         {Opt_verbose, "verbose"},
186         {Opt_volume, "volume=%s"},
187         {Opt_ignore, "grpquota"},
188         {Opt_ignore, "noquota"},
189         {Opt_ignore, "quota"},
190         {Opt_ignore, "usrquota"},
191         {Opt_err, NULL},
192 };
193 
194 static int
195 parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
196                 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
197 {
198         char *p;
199         substring_t args[MAX_OPT_ARGS];
200 
201         /* Fill in defaults */
202 
203         *uid        = current_uid();
204         *gid        = current_gid();
205         *reserved   = 2;
206         *root       = -1;
207         *blocksize  = -1;
208         volume[0]   = ':';
209         volume[1]   = 0;
210         *mount_opts = 0;
211         if (!options)
212                 return 1;
213 
214         while ((p = strsep(&options, ",")) != NULL) {
215                 int token, n, option;
216                 if (!*p)
217                         continue;
218 
219                 token = match_token(p, tokens, args);
220                 switch (token) {
221                 case Opt_bs:
222                         if (match_int(&args[0], &n))
223                                 return 0;
224                         if (n != 512 && n != 1024 && n != 2048
225                             && n != 4096) {
226                                 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
227                                 return 0;
228                         }
229                         *blocksize = n;
230                         break;
231                 case Opt_mode:
232                         if (match_octal(&args[0], &option))
233                                 return 0;
234                         *mode = option & 0777;
235                         affs_set_opt(*mount_opts, SF_SETMODE);
236                         break;
237                 case Opt_mufs:
238                         affs_set_opt(*mount_opts, SF_MUFS);
239                         break;
240                 case Opt_notruncate:
241                         affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
242                         break;
243                 case Opt_prefix:
244                         *prefix = match_strdup(&args[0]);
245                         if (!*prefix)
246                                 return 0;
247                         affs_set_opt(*mount_opts, SF_PREFIX);
248                         break;
249                 case Opt_protect:
250                         affs_set_opt(*mount_opts, SF_IMMUTABLE);
251                         break;
252                 case Opt_reserved:
253                         if (match_int(&args[0], reserved))
254                                 return 0;
255                         break;
256                 case Opt_root:
257                         if (match_int(&args[0], root))
258                                 return 0;
259                         break;
260                 case Opt_setgid:
261                         if (match_int(&args[0], &option))
262                                 return 0;
263                         *gid = make_kgid(current_user_ns(), option);
264                         if (!gid_valid(*gid))
265                                 return 0;
266                         affs_set_opt(*mount_opts, SF_SETGID);
267                         break;
268                 case Opt_setuid:
269                         if (match_int(&args[0], &option))
270                                 return 0;
271                         *uid = make_kuid(current_user_ns(), option);
272                         if (!uid_valid(*uid))
273                                 return 0;
274                         affs_set_opt(*mount_opts, SF_SETUID);
275                         break;
276                 case Opt_verbose:
277                         affs_set_opt(*mount_opts, SF_VERBOSE);
278                         break;
279                 case Opt_volume: {
280                         char *vol = match_strdup(&args[0]);
281                         if (!vol)
282                                 return 0;
283                         strlcpy(volume, vol, 32);
284                         kfree(vol);
285                         break;
286                 }
287                 case Opt_ignore:
288                         /* Silently ignore the quota options */
289                         break;
290                 default:
291                         pr_warn("Unrecognized mount option \"%s\" or missing value\n",
292                                 p);
293                         return 0;
294                 }
295         }
296         return 1;
297 }
298 
299 static int affs_show_options(struct seq_file *m, struct dentry *root)
300 {
301         struct super_block *sb = root->d_sb;
302         struct affs_sb_info *sbi = AFFS_SB(sb);
303 
304         if (sb->s_blocksize)
305                 seq_printf(m, ",bs=%lu", sb->s_blocksize);
306         if (affs_test_opt(sbi->s_flags, SF_SETMODE))
307                 seq_printf(m, ",mode=%o", sbi->s_mode);
308         if (affs_test_opt(sbi->s_flags, SF_MUFS))
309                 seq_puts(m, ",mufs");
310         if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
311                 seq_puts(m, ",nofilenametruncate");
312         if (affs_test_opt(sbi->s_flags, SF_PREFIX))
313                 seq_printf(m, ",prefix=%s", sbi->s_prefix);
314         if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
315                 seq_puts(m, ",protect");
316         if (sbi->s_reserved != 2)
317                 seq_printf(m, ",reserved=%u", sbi->s_reserved);
318         if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
319                 seq_printf(m, ",root=%u", sbi->s_root_block);
320         if (affs_test_opt(sbi->s_flags, SF_SETGID))
321                 seq_printf(m, ",setgid=%u",
322                            from_kgid_munged(&init_user_ns, sbi->s_gid));
323         if (affs_test_opt(sbi->s_flags, SF_SETUID))
324                 seq_printf(m, ",setuid=%u",
325                            from_kuid_munged(&init_user_ns, sbi->s_uid));
326         if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
327                 seq_puts(m, ",verbose");
328         if (sbi->s_volume[0])
329                 seq_printf(m, ",volume=%s", sbi->s_volume);
330         return 0;
331 }
332 
333 /* This function definitely needs to be split up. Some fine day I'll
334  * hopefully have the guts to do so. Until then: sorry for the mess.
335  */
336 
337 static int affs_fill_super(struct super_block *sb, void *data, int silent)
338 {
339         struct affs_sb_info     *sbi;
340         struct buffer_head      *root_bh = NULL;
341         struct buffer_head      *boot_bh;
342         struct inode            *root_inode = NULL;
343         s32                      root_block;
344         int                      size, blocksize;
345         u32                      chksum;
346         int                      num_bm;
347         int                      i, j;
348         kuid_t                   uid;
349         kgid_t                   gid;
350         int                      reserved;
351         unsigned long            mount_flags;
352         int                      tmp_flags;     /* fix remount prototype... */
353         u8                       sig[4];
354         int                      ret;
355 
356         pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
357 
358         sb->s_magic             = AFFS_SUPER_MAGIC;
359         sb->s_op                = &affs_sops;
360         sb->s_flags |= SB_NODIRATIME;
361 
362         sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
363         if (!sbi)
364                 return -ENOMEM;
365 
366         sb->s_fs_info = sbi;
367         sbi->sb = sb;
368         mutex_init(&sbi->s_bmlock);
369         spin_lock_init(&sbi->symlink_lock);
370         spin_lock_init(&sbi->work_lock);
371         INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
372 
373         if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
374                                 &blocksize,&sbi->s_prefix,
375                                 sbi->s_volume, &mount_flags)) {
376                 pr_err("Error parsing options\n");
377                 return -EINVAL;
378         }
379         /* N.B. after this point s_prefix must be released */
380 
381         sbi->s_flags   = mount_flags;
382         sbi->s_mode    = i;
383         sbi->s_uid     = uid;
384         sbi->s_gid     = gid;
385         sbi->s_reserved= reserved;
386 
387         /* Get the size of the device in 512-byte blocks.
388          * If we later see that the partition uses bigger
389          * blocks, we will have to change it.
390          */
391 
392         size = i_size_read(sb->s_bdev->bd_inode) >> 9;
393         pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
394 
395         affs_set_blocksize(sb, PAGE_SIZE);
396         /* Try to find root block. Its location depends on the block size. */
397 
398         i = bdev_logical_block_size(sb->s_bdev);
399         j = PAGE_SIZE;
400         if (blocksize > 0) {
401                 i = j = blocksize;
402                 size = size / (blocksize / 512);
403         }
404 
405         for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
406                 sbi->s_root_block = root_block;
407                 if (root_block < 0)
408                         sbi->s_root_block = (reserved + size - 1) / 2;
409                 pr_debug("setting blocksize to %d\n", blocksize);
410                 affs_set_blocksize(sb, blocksize);
411                 sbi->s_partition_size = size;
412 
413                 /* The root block location that was calculated above is not
414                  * correct if the partition size is an odd number of 512-
415                  * byte blocks, which will be rounded down to a number of
416                  * 1024-byte blocks, and if there were an even number of
417                  * reserved blocks. Ideally, all partition checkers should
418                  * report the real number of blocks of the real blocksize,
419                  * but since this just cannot be done, we have to try to
420                  * find the root block anyways. In the above case, it is one
421                  * block behind the calculated one. So we check this one, too.
422                  */
423                 for (num_bm = 0; num_bm < 2; num_bm++) {
424                         pr_debug("Dev %s, trying root=%u, bs=%d, "
425                                 "size=%d, reserved=%d\n",
426                                 sb->s_id,
427                                 sbi->s_root_block + num_bm,
428                                 blocksize, size, reserved);
429                         root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
430                         if (!root_bh)
431                                 continue;
432                         if (!affs_checksum_block(sb, root_bh) &&
433                             be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
434                             be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
435                                 sbi->s_hashsize    = blocksize / 4 - 56;
436                                 sbi->s_root_block += num_bm;
437                                 goto got_root;
438                         }
439                         affs_brelse(root_bh);
440                         root_bh = NULL;
441                 }
442         }
443         if (!silent)
444                 pr_err("No valid root block on device %s\n", sb->s_id);
445         return -EINVAL;
446 
447         /* N.B. after this point bh must be released */
448 got_root:
449         /* Keep super block in cache */
450         sbi->s_root_bh = root_bh;
451         root_block = sbi->s_root_block;
452 
453         /* Find out which kind of FS we have */
454         boot_bh = sb_bread(sb, 0);
455         if (!boot_bh) {
456                 pr_err("Cannot read boot block\n");
457                 return -EINVAL;
458         }
459         memcpy(sig, boot_bh->b_data, 4);
460         brelse(boot_bh);
461         chksum = be32_to_cpu(*(__be32 *)sig);
462 
463         /* Dircache filesystems are compatible with non-dircache ones
464          * when reading. As long as they aren't supported, writing is
465          * not recommended.
466          */
467         if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
468              || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
469                 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
470                 sb->s_flags |= SB_RDONLY;
471         }
472         switch (chksum) {
473         case MUFS_FS:
474         case MUFS_INTLFFS:
475         case MUFS_DCFFS:
476                 affs_set_opt(sbi->s_flags, SF_MUFS);
477                 /* fall thru */
478         case FS_INTLFFS:
479         case FS_DCFFS:
480                 affs_set_opt(sbi->s_flags, SF_INTL);
481                 break;
482         case MUFS_FFS:
483                 affs_set_opt(sbi->s_flags, SF_MUFS);
484                 break;
485         case FS_FFS:
486                 break;
487         case MUFS_OFS:
488                 affs_set_opt(sbi->s_flags, SF_MUFS);
489                 /* fall thru */
490         case FS_OFS:
491                 affs_set_opt(sbi->s_flags, SF_OFS);
492                 sb->s_flags |= SB_NOEXEC;
493                 break;
494         case MUFS_DCOFS:
495         case MUFS_INTLOFS:
496                 affs_set_opt(sbi->s_flags, SF_MUFS);
497         case FS_DCOFS:
498         case FS_INTLOFS:
499                 affs_set_opt(sbi->s_flags, SF_INTL);
500                 affs_set_opt(sbi->s_flags, SF_OFS);
501                 sb->s_flags |= SB_NOEXEC;
502                 break;
503         default:
504                 pr_err("Unknown filesystem on device %s: %08X\n",
505                        sb->s_id, chksum);
506                 return -EINVAL;
507         }
508 
509         if (affs_test_opt(mount_flags, SF_VERBOSE)) {
510                 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
511                 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
512                         len > 31 ? 31 : len,
513                         AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
514                         sig, sig[3] + '', blocksize);
515         }
516 
517         sb->s_flags |= SB_NODEV | SB_NOSUID;
518 
519         sbi->s_data_blksize = sb->s_blocksize;
520         if (affs_test_opt(sbi->s_flags, SF_OFS))
521                 sbi->s_data_blksize -= 24;
522 
523         tmp_flags = sb->s_flags;
524         ret = affs_init_bitmap(sb, &tmp_flags);
525         if (ret)
526                 return ret;
527         sb->s_flags = tmp_flags;
528 
529         /* set up enough so that it can read an inode */
530 
531         root_inode = affs_iget(sb, root_block);
532         if (IS_ERR(root_inode))
533                 return PTR_ERR(root_inode);
534 
535         if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
536                 sb->s_d_op = &affs_intl_dentry_operations;
537         else
538                 sb->s_d_op = &affs_dentry_operations;
539 
540         sb->s_root = d_make_root(root_inode);
541         if (!sb->s_root) {
542                 pr_err("AFFS: Get root inode failed\n");
543                 return -ENOMEM;
544         }
545 
546         sb->s_export_op = &affs_export_ops;
547         pr_debug("s_flags=%lX\n", sb->s_flags);
548         return 0;
549 }
550 
551 static int
552 affs_remount(struct super_block *sb, int *flags, char *data)
553 {
554         struct affs_sb_info     *sbi = AFFS_SB(sb);
555         int                      blocksize;
556         kuid_t                   uid;
557         kgid_t                   gid;
558         int                      mode;
559         int                      reserved;
560         int                      root_block;
561         unsigned long            mount_flags;
562         int                      res = 0;
563         char                    *new_opts;
564         char                     volume[32];
565         char                    *prefix = NULL;
566 
567         new_opts = kstrdup(data, GFP_KERNEL);
568         if (data && !new_opts)
569                 return -ENOMEM;
570 
571         pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
572 
573         sync_filesystem(sb);
574         *flags |= SB_NODIRATIME;
575 
576         memcpy(volume, sbi->s_volume, 32);
577         if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
578                            &blocksize, &prefix, volume,
579                            &mount_flags)) {
580                 kfree(prefix);
581                 kfree(new_opts);
582                 return -EINVAL;
583         }
584 
585         flush_delayed_work(&sbi->sb_work);
586 
587         sbi->s_flags = mount_flags;
588         sbi->s_mode  = mode;
589         sbi->s_uid   = uid;
590         sbi->s_gid   = gid;
591         /* protect against readers */
592         spin_lock(&sbi->symlink_lock);
593         if (prefix) {
594                 kfree(sbi->s_prefix);
595                 sbi->s_prefix = prefix;
596         }
597         memcpy(sbi->s_volume, volume, 32);
598         spin_unlock(&sbi->symlink_lock);
599 
600         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
601                 return 0;
602 
603         if (*flags & SB_RDONLY)
604                 affs_free_bitmap(sb);
605         else
606                 res = affs_init_bitmap(sb, flags);
607 
608         return res;
609 }
610 
611 static int
612 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
613 {
614         struct super_block *sb = dentry->d_sb;
615         int              free;
616         u64              id = huge_encode_dev(sb->s_bdev->bd_dev);
617 
618         pr_debug("%s() partsize=%d, reserved=%d\n",
619                  __func__, AFFS_SB(sb)->s_partition_size,
620                  AFFS_SB(sb)->s_reserved);
621 
622         free          = affs_count_free_blocks(sb);
623         buf->f_type    = AFFS_SUPER_MAGIC;
624         buf->f_bsize   = sb->s_blocksize;
625         buf->f_blocks  = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
626         buf->f_bfree   = free;
627         buf->f_bavail  = free;
628         buf->f_fsid.val[0] = (u32)id;
629         buf->f_fsid.val[1] = (u32)(id >> 32);
630         buf->f_namelen = AFFSNAMEMAX;
631         return 0;
632 }
633 
634 static struct dentry *affs_mount(struct file_system_type *fs_type,
635         int flags, const char *dev_name, void *data)
636 {
637         return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
638 }
639 
640 static void affs_kill_sb(struct super_block *sb)
641 {
642         struct affs_sb_info *sbi = AFFS_SB(sb);
643         kill_block_super(sb);
644         if (sbi) {
645                 affs_free_bitmap(sb);
646                 affs_brelse(sbi->s_root_bh);
647                 kfree(sbi->s_prefix);
648                 mutex_destroy(&sbi->s_bmlock);
649                 kfree(sbi);
650         }
651 }
652 
653 static struct file_system_type affs_fs_type = {
654         .owner          = THIS_MODULE,
655         .name           = "affs",
656         .mount          = affs_mount,
657         .kill_sb        = affs_kill_sb,
658         .fs_flags       = FS_REQUIRES_DEV,
659 };
660 MODULE_ALIAS_FS("affs");
661 
662 static int __init init_affs_fs(void)
663 {
664         int err = init_inodecache();
665         if (err)
666                 goto out1;
667         err = register_filesystem(&affs_fs_type);
668         if (err)
669                 goto out;
670         return 0;
671 out:
672         destroy_inodecache();
673 out1:
674         return err;
675 }
676 
677 static void __exit exit_affs_fs(void)
678 {
679         unregister_filesystem(&affs_fs_type);
680         destroy_inodecache();
681 }
682 
683 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
684 MODULE_LICENSE("GPL");
685 
686 module_init(init_affs_fs)
687 module_exit(exit_affs_fs)
688 

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