backlight: fix pwm_bl.c when multiple PWM backlights exist
[linux-2.6] / fs / hfsplus / super.c
1 /*
2  *  linux/fs/hfsplus/super.c
3  *
4  * Copyright (C) 2001
5  * Brad Boyer (flar@allandria.com)
6  * (C) 2003 Ardis Technologies <roman@ardistech.com>
7  *
8  */
9
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/pagemap.h>
13 #include <linux/fs.h>
14 #include <linux/slab.h>
15 #include <linux/vfs.h>
16 #include <linux/nls.h>
17
18 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
19 static void hfsplus_destroy_inode(struct inode *inode);
20
21 #include "hfsplus_fs.h"
22
23 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
24 {
25         struct hfs_find_data fd;
26         struct hfsplus_vh *vhdr;
27         struct inode *inode;
28         long err = -EIO;
29
30         inode = iget_locked(sb, ino);
31         if (!inode)
32                 return ERR_PTR(-ENOMEM);
33         if (!(inode->i_state & I_NEW))
34                 return inode;
35
36         INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
37         mutex_init(&HFSPLUS_I(inode).extents_lock);
38         HFSPLUS_I(inode).flags = 0;
39         HFSPLUS_I(inode).rsrc_inode = NULL;
40         atomic_set(&HFSPLUS_I(inode).opencnt, 0);
41
42         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
43         read_inode:
44                 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
45                 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
46                 if (!err)
47                         err = hfsplus_cat_read_inode(inode, &fd);
48                 hfs_find_exit(&fd);
49                 if (err)
50                         goto bad_inode;
51                 goto done;
52         }
53         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
54         switch(inode->i_ino) {
55         case HFSPLUS_ROOT_CNID:
56                 goto read_inode;
57         case HFSPLUS_EXT_CNID:
58                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
59                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
60                 break;
61         case HFSPLUS_CAT_CNID:
62                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
63                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
64                 break;
65         case HFSPLUS_ALLOC_CNID:
66                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
67                 inode->i_mapping->a_ops = &hfsplus_aops;
68                 break;
69         case HFSPLUS_START_CNID:
70                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
71                 break;
72         case HFSPLUS_ATTR_CNID:
73                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
74                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
75                 break;
76         default:
77                 goto bad_inode;
78         }
79
80 done:
81         unlock_new_inode(inode);
82         return inode;
83
84 bad_inode:
85         iget_failed(inode);
86         return ERR_PTR(err);
87 }
88
89 static int hfsplus_write_inode(struct inode *inode, int unused)
90 {
91         struct hfsplus_vh *vhdr;
92         int ret = 0;
93
94         dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
95         hfsplus_ext_write_extent(inode);
96         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
97                 return hfsplus_cat_write_inode(inode);
98         }
99         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
100         switch (inode->i_ino) {
101         case HFSPLUS_ROOT_CNID:
102                 ret = hfsplus_cat_write_inode(inode);
103                 break;
104         case HFSPLUS_EXT_CNID:
105                 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
106                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
107                         inode->i_sb->s_dirt = 1;
108                 }
109                 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
110                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
111                 break;
112         case HFSPLUS_CAT_CNID:
113                 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
114                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
115                         inode->i_sb->s_dirt = 1;
116                 }
117                 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
118                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
119                 break;
120         case HFSPLUS_ALLOC_CNID:
121                 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
122                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
123                         inode->i_sb->s_dirt = 1;
124                 }
125                 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
126                 break;
127         case HFSPLUS_START_CNID:
128                 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
129                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
130                         inode->i_sb->s_dirt = 1;
131                 }
132                 hfsplus_inode_write_fork(inode, &vhdr->start_file);
133                 break;
134         case HFSPLUS_ATTR_CNID:
135                 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
136                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
137                         inode->i_sb->s_dirt = 1;
138                 }
139                 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
140                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
141                 break;
142         }
143         return ret;
144 }
145
146 static void hfsplus_clear_inode(struct inode *inode)
147 {
148         dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
149         if (HFSPLUS_IS_RSRC(inode)) {
150                 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
151                 iput(HFSPLUS_I(inode).rsrc_inode);
152         }
153 }
154
155 static void hfsplus_write_super(struct super_block *sb)
156 {
157         struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
158
159         dprint(DBG_SUPER, "hfsplus_write_super\n");
160         sb->s_dirt = 0;
161         if (sb->s_flags & MS_RDONLY)
162                 /* warn? */
163                 return;
164
165         vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
166         vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
167         vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
168         vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
169         vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
170
171         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
172         if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
173                 if (HFSPLUS_SB(sb).sect_count) {
174                         struct buffer_head *bh;
175                         u32 block, offset;
176
177                         block = HFSPLUS_SB(sb).blockoffset;
178                         block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
179                         offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
180                         printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
181                                 HFSPLUS_SB(sb).sect_count, block, offset);
182                         bh = sb_bread(sb, block);
183                         if (bh) {
184                                 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
185                                 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
186                                         memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
187                                         mark_buffer_dirty(bh);
188                                         brelse(bh);
189                                 } else
190                                         printk(KERN_WARNING "hfs: backup not found!\n");
191                         }
192                 }
193                 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
194         }
195 }
196
197 static void hfsplus_put_super(struct super_block *sb)
198 {
199         dprint(DBG_SUPER, "hfsplus_put_super\n");
200         if (!sb->s_fs_info)
201                 return;
202         if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
203                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
204
205                 vhdr->modify_date = hfsp_now2mt();
206                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
207                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
208                 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
209                 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
210         }
211
212         hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
213         hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
214         iput(HFSPLUS_SB(sb).alloc_file);
215         iput(HFSPLUS_SB(sb).hidden_dir);
216         brelse(HFSPLUS_SB(sb).s_vhbh);
217         if (HFSPLUS_SB(sb).nls)
218                 unload_nls(HFSPLUS_SB(sb).nls);
219         kfree(sb->s_fs_info);
220         sb->s_fs_info = NULL;
221 }
222
223 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
224 {
225         struct super_block *sb = dentry->d_sb;
226         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
227
228         buf->f_type = HFSPLUS_SUPER_MAGIC;
229         buf->f_bsize = sb->s_blocksize;
230         buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
231         buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
232         buf->f_bavail = buf->f_bfree;
233         buf->f_files = 0xFFFFFFFF;
234         buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
235         buf->f_fsid.val[0] = (u32)id;
236         buf->f_fsid.val[1] = (u32)(id >> 32);
237         buf->f_namelen = HFSPLUS_MAX_STRLEN;
238
239         return 0;
240 }
241
242 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
243 {
244         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
245                 return 0;
246         if (!(*flags & MS_RDONLY)) {
247                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
248                 struct hfsplus_sb_info sbi;
249
250                 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
251                 sbi.nls = HFSPLUS_SB(sb).nls;
252                 if (!hfsplus_parse_options(data, &sbi))
253                         return -EINVAL;
254
255                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
256                         printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
257                                "running fsck.hfsplus is recommended.  leaving read-only.\n");
258                         sb->s_flags |= MS_RDONLY;
259                         *flags |= MS_RDONLY;
260                 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
261                         /* nothing */
262                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
263                         printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
264                         sb->s_flags |= MS_RDONLY;
265                         *flags |= MS_RDONLY;
266                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
267                         printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
268                         sb->s_flags |= MS_RDONLY;
269                         *flags |= MS_RDONLY;
270                 }
271         }
272         return 0;
273 }
274
275 static const struct super_operations hfsplus_sops = {
276         .alloc_inode    = hfsplus_alloc_inode,
277         .destroy_inode  = hfsplus_destroy_inode,
278         .write_inode    = hfsplus_write_inode,
279         .clear_inode    = hfsplus_clear_inode,
280         .put_super      = hfsplus_put_super,
281         .write_super    = hfsplus_write_super,
282         .statfs         = hfsplus_statfs,
283         .remount_fs     = hfsplus_remount,
284         .show_options   = hfsplus_show_options,
285 };
286
287 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
288 {
289         struct hfsplus_vh *vhdr;
290         struct hfsplus_sb_info *sbi;
291         hfsplus_cat_entry entry;
292         struct hfs_find_data fd;
293         struct inode *root, *inode;
294         struct qstr str;
295         struct nls_table *nls = NULL;
296         int err = -EINVAL;
297
298         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
299         if (!sbi)
300                 return -ENOMEM;
301
302         sb->s_fs_info = sbi;
303         INIT_HLIST_HEAD(&sbi->rsrc_inodes);
304         hfsplus_fill_defaults(sbi);
305         if (!hfsplus_parse_options(data, sbi)) {
306                 printk(KERN_ERR "hfs: unable to parse mount options\n");
307                 err = -EINVAL;
308                 goto cleanup;
309         }
310
311         /* temporarily use utf8 to correctly find the hidden dir below */
312         nls = sbi->nls;
313         sbi->nls = load_nls("utf8");
314         if (!sbi->nls) {
315                 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
316                 err = -EINVAL;
317                 goto cleanup;
318         }
319
320         /* Grab the volume header */
321         if (hfsplus_read_wrapper(sb)) {
322                 if (!silent)
323                         printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
324                 err = -EINVAL;
325                 goto cleanup;
326         }
327         vhdr = HFSPLUS_SB(sb).s_vhdr;
328
329         /* Copy parts of the volume header into the superblock */
330         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
331         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
332             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
333                 printk(KERN_ERR "hfs: wrong filesystem version\n");
334                 goto cleanup;
335         }
336         HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
337         HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
338         HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
339         HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
340         HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
341         HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
342         HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
343         if (!HFSPLUS_SB(sb).data_clump_blocks)
344                 HFSPLUS_SB(sb).data_clump_blocks = 1;
345         HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
346         if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
347                 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
348
349         /* Set up operations so we can load metadata */
350         sb->s_op = &hfsplus_sops;
351         sb->s_maxbytes = MAX_LFS_FILESIZE;
352
353         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
354                 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
355                        "running fsck.hfsplus is recommended.  mounting read-only.\n");
356                 sb->s_flags |= MS_RDONLY;
357         } else if (sbi->flags & HFSPLUS_SB_FORCE) {
358                 /* nothing */
359         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
360                 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
361                 sb->s_flags |= MS_RDONLY;
362         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) {
363                 printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
364                        "use the force option at your own risk, mounting read-only.\n");
365                 sb->s_flags |= MS_RDONLY;
366         }
367         sbi->flags &= ~HFSPLUS_SB_FORCE;
368
369         /* Load metadata objects (B*Trees) */
370         HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
371         if (!HFSPLUS_SB(sb).ext_tree) {
372                 printk(KERN_ERR "hfs: failed to load extents file\n");
373                 goto cleanup;
374         }
375         HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
376         if (!HFSPLUS_SB(sb).cat_tree) {
377                 printk(KERN_ERR "hfs: failed to load catalog file\n");
378                 goto cleanup;
379         }
380
381         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
382         if (IS_ERR(inode)) {
383                 printk(KERN_ERR "hfs: failed to load allocation file\n");
384                 err = PTR_ERR(inode);
385                 goto cleanup;
386         }
387         HFSPLUS_SB(sb).alloc_file = inode;
388
389         /* Load the root directory */
390         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
391         if (IS_ERR(root)) {
392                 printk(KERN_ERR "hfs: failed to load root directory\n");
393                 err = PTR_ERR(root);
394                 goto cleanup;
395         }
396         sb->s_root = d_alloc_root(root);
397         if (!sb->s_root) {
398                 iput(root);
399                 err = -ENOMEM;
400                 goto cleanup;
401         }
402         sb->s_root->d_op = &hfsplus_dentry_operations;
403
404         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
405         str.name = HFSP_HIDDENDIR_NAME;
406         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
407         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
408         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
409                 hfs_find_exit(&fd);
410                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
411                         goto cleanup;
412                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
413                 if (IS_ERR(inode)) {
414                         err = PTR_ERR(inode);
415                         goto cleanup;
416                 }
417                 HFSPLUS_SB(sb).hidden_dir = inode;
418         } else
419                 hfs_find_exit(&fd);
420
421         if (sb->s_flags & MS_RDONLY)
422                 goto out;
423
424         /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
425          * all three are registered with Apple for our use
426          */
427         vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
428         vhdr->modify_date = hfsp_now2mt();
429         be32_add_cpu(&vhdr->write_count, 1);
430         vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
431         vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
432         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
433         sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
434
435         if (!HFSPLUS_SB(sb).hidden_dir) {
436                 printk(KERN_DEBUG "hfs: create hidden dir...\n");
437                 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
438                 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
439                                    &str, HFSPLUS_SB(sb).hidden_dir);
440                 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
441         }
442 out:
443         unload_nls(sbi->nls);
444         sbi->nls = nls;
445         return 0;
446
447 cleanup:
448         hfsplus_put_super(sb);
449         if (nls)
450                 unload_nls(nls);
451         return err;
452 }
453
454 MODULE_AUTHOR("Brad Boyer");
455 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
456 MODULE_LICENSE("GPL");
457
458 static struct kmem_cache *hfsplus_inode_cachep;
459
460 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
461 {
462         struct hfsplus_inode_info *i;
463
464         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
465         return i ? &i->vfs_inode : NULL;
466 }
467
468 static void hfsplus_destroy_inode(struct inode *inode)
469 {
470         kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
471 }
472
473 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
474
475 static int hfsplus_get_sb(struct file_system_type *fs_type,
476                           int flags, const char *dev_name, void *data,
477                           struct vfsmount *mnt)
478 {
479         return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
480                            mnt);
481 }
482
483 static struct file_system_type hfsplus_fs_type = {
484         .owner          = THIS_MODULE,
485         .name           = "hfsplus",
486         .get_sb         = hfsplus_get_sb,
487         .kill_sb        = kill_block_super,
488         .fs_flags       = FS_REQUIRES_DEV,
489 };
490
491 static void hfsplus_init_once(void *p)
492 {
493         struct hfsplus_inode_info *i = p;
494
495         inode_init_once(&i->vfs_inode);
496 }
497
498 static int __init init_hfsplus_fs(void)
499 {
500         int err;
501
502         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
503                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
504                 hfsplus_init_once);
505         if (!hfsplus_inode_cachep)
506                 return -ENOMEM;
507         err = register_filesystem(&hfsplus_fs_type);
508         if (err)
509                 kmem_cache_destroy(hfsplus_inode_cachep);
510         return err;
511 }
512
513 static void __exit exit_hfsplus_fs(void)
514 {
515         unregister_filesystem(&hfsplus_fs_type);
516         kmem_cache_destroy(hfsplus_inode_cachep);
517 }
518
519 module_init(init_hfsplus_fs)
520 module_exit(exit_hfsplus_fs)