~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.4 ] ~ [ linux-5.3.13 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.86 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.156 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.203 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.202 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp