Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/hfsplus
[pandora-kernel.git] / 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/blkdev.h>
14 #include <linux/fs.h>
15 #include <linux/slab.h>
16 #include <linux/vfs.h>
17 #include <linux/nls.h>
18
19 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
20 static void hfsplus_destroy_inode(struct inode *inode);
21
22 #include "hfsplus_fs.h"
23
24 static int hfsplus_system_read_inode(struct inode *inode)
25 {
26         struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
27
28         switch (inode->i_ino) {
29         case HFSPLUS_EXT_CNID:
30                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
31                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
32                 break;
33         case HFSPLUS_CAT_CNID:
34                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
35                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
36                 break;
37         case HFSPLUS_ALLOC_CNID:
38                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
39                 inode->i_mapping->a_ops = &hfsplus_aops;
40                 break;
41         case HFSPLUS_START_CNID:
42                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
43                 break;
44         case HFSPLUS_ATTR_CNID:
45                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
46                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
47                 break;
48         default:
49                 return -EIO;
50         }
51
52         return 0;
53 }
54
55 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
56 {
57         struct hfs_find_data fd;
58         struct inode *inode;
59         int err;
60
61         inode = iget_locked(sb, ino);
62         if (!inode)
63                 return ERR_PTR(-ENOMEM);
64         if (!(inode->i_state & I_NEW))
65                 return inode;
66
67         INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
68         mutex_init(&HFSPLUS_I(inode)->extents_lock);
69         HFSPLUS_I(inode)->flags = 0;
70         HFSPLUS_I(inode)->extent_state = 0;
71         HFSPLUS_I(inode)->rsrc_inode = NULL;
72         atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
73
74         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
75             inode->i_ino == HFSPLUS_ROOT_CNID) {
76                 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
77                 if (!err) {
78                         err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
79                         if (!err)
80                                 err = hfsplus_cat_read_inode(inode, &fd);
81                         hfs_find_exit(&fd);
82                 }
83         } else {
84                 err = hfsplus_system_read_inode(inode);
85         }
86
87         if (err) {
88                 iget_failed(inode);
89                 return ERR_PTR(err);
90         }
91
92         unlock_new_inode(inode);
93         return inode;
94 }
95
96 static int hfsplus_system_write_inode(struct inode *inode)
97 {
98         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
99         struct hfsplus_vh *vhdr = sbi->s_vhdr;
100         struct hfsplus_fork_raw *fork;
101         struct hfs_btree *tree = NULL;
102
103         switch (inode->i_ino) {
104         case HFSPLUS_EXT_CNID:
105                 fork = &vhdr->ext_file;
106                 tree = sbi->ext_tree;
107                 break;
108         case HFSPLUS_CAT_CNID:
109                 fork = &vhdr->cat_file;
110                 tree = sbi->cat_tree;
111                 break;
112         case HFSPLUS_ALLOC_CNID:
113                 fork = &vhdr->alloc_file;
114                 break;
115         case HFSPLUS_START_CNID:
116                 fork = &vhdr->start_file;
117                 break;
118         case HFSPLUS_ATTR_CNID:
119                 fork = &vhdr->attr_file;
120                 tree = sbi->attr_tree;
121         default:
122                 return -EIO;
123         }
124
125         if (fork->total_size != cpu_to_be64(inode->i_size)) {
126                 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
127                 inode->i_sb->s_dirt = 1;
128         }
129         hfsplus_inode_write_fork(inode, fork);
130         if (tree)
131                 hfs_btree_write(tree);
132         return 0;
133 }
134
135 static int hfsplus_write_inode(struct inode *inode,
136                 struct writeback_control *wbc)
137 {
138         int err;
139
140         dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
141
142         err = hfsplus_ext_write_extent(inode);
143         if (err)
144                 return err;
145
146         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
147             inode->i_ino == HFSPLUS_ROOT_CNID)
148                 return hfsplus_cat_write_inode(inode);
149         else
150                 return hfsplus_system_write_inode(inode);
151 }
152
153 static void hfsplus_evict_inode(struct inode *inode)
154 {
155         dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
156         truncate_inode_pages(&inode->i_data, 0);
157         end_writeback(inode);
158         if (HFSPLUS_IS_RSRC(inode)) {
159                 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
160                 iput(HFSPLUS_I(inode)->rsrc_inode);
161         }
162 }
163
164 int hfsplus_sync_fs(struct super_block *sb, int wait)
165 {
166         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
167         struct hfsplus_vh *vhdr = sbi->s_vhdr;
168         int write_backup = 0;
169         int error, error2;
170
171         if (!wait)
172                 return 0;
173
174         dprint(DBG_SUPER, "hfsplus_write_super\n");
175
176         sb->s_dirt = 0;
177
178         /*
179          * Explicitly write out the special metadata inodes.
180          *
181          * While these special inodes are marked as hashed and written
182          * out peridocically by the flusher threads we redirty them
183          * during writeout of normal inodes, and thus the life lock
184          * prevents us from getting the latest state to disk.
185          */
186         error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
187         error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
188         if (!error)
189                 error = error2;
190         error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
191         if (!error)
192                 error = error2;
193
194         mutex_lock(&sbi->vh_mutex);
195         mutex_lock(&sbi->alloc_mutex);
196         vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
197         vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
198         vhdr->folder_count = cpu_to_be32(sbi->folder_count);
199         vhdr->file_count = cpu_to_be32(sbi->file_count);
200
201         if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
202                 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
203                 write_backup = 1;
204         }
205
206         error2 = hfsplus_submit_bio(sb,
207                                    sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
208                                    sbi->s_vhdr_buf, NULL, WRITE_SYNC);
209         if (!error)
210                 error = error2;
211         if (!write_backup)
212                 goto out;
213
214         error2 = hfsplus_submit_bio(sb,
215                                   sbi->part_start + sbi->sect_count - 2,
216                                   sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC);
217         if (!error)
218                 error2 = error;
219 out:
220         mutex_unlock(&sbi->alloc_mutex);
221         mutex_unlock(&sbi->vh_mutex);
222
223         if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
224                 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
225
226         return error;
227 }
228
229 static void hfsplus_write_super(struct super_block *sb)
230 {
231         if (!(sb->s_flags & MS_RDONLY))
232                 hfsplus_sync_fs(sb, 1);
233         else
234                 sb->s_dirt = 0;
235 }
236
237 static void hfsplus_put_super(struct super_block *sb)
238 {
239         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
240
241         dprint(DBG_SUPER, "hfsplus_put_super\n");
242
243         if (!sb->s_fs_info)
244                 return;
245
246         if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
247                 struct hfsplus_vh *vhdr = sbi->s_vhdr;
248
249                 vhdr->modify_date = hfsp_now2mt();
250                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
251                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
252
253                 hfsplus_sync_fs(sb, 1);
254         }
255
256         hfs_btree_close(sbi->cat_tree);
257         hfs_btree_close(sbi->ext_tree);
258         iput(sbi->alloc_file);
259         iput(sbi->hidden_dir);
260         kfree(sbi->s_vhdr_buf);
261         kfree(sbi->s_backup_vhdr_buf);
262         unload_nls(sbi->nls);
263         kfree(sb->s_fs_info);
264         sb->s_fs_info = NULL;
265 }
266
267 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
268 {
269         struct super_block *sb = dentry->d_sb;
270         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
271         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
272
273         buf->f_type = HFSPLUS_SUPER_MAGIC;
274         buf->f_bsize = sb->s_blocksize;
275         buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
276         buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
277         buf->f_bavail = buf->f_bfree;
278         buf->f_files = 0xFFFFFFFF;
279         buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
280         buf->f_fsid.val[0] = (u32)id;
281         buf->f_fsid.val[1] = (u32)(id >> 32);
282         buf->f_namelen = HFSPLUS_MAX_STRLEN;
283
284         return 0;
285 }
286
287 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
288 {
289         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
290                 return 0;
291         if (!(*flags & MS_RDONLY)) {
292                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
293                 int force = 0;
294
295                 if (!hfsplus_parse_options_remount(data, &force))
296                         return -EINVAL;
297
298                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
299                         printk(KERN_WARNING "hfs: filesystem was "
300                                         "not cleanly unmounted, "
301                                         "running fsck.hfsplus is recommended.  "
302                                         "leaving read-only.\n");
303                         sb->s_flags |= MS_RDONLY;
304                         *flags |= MS_RDONLY;
305                 } else if (force) {
306                         /* nothing */
307                 } else if (vhdr->attributes &
308                                 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
309                         printk(KERN_WARNING "hfs: filesystem is marked locked, "
310                                         "leaving read-only.\n");
311                         sb->s_flags |= MS_RDONLY;
312                         *flags |= MS_RDONLY;
313                 } else if (vhdr->attributes &
314                                 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
315                         printk(KERN_WARNING "hfs: filesystem is "
316                                         "marked journaled, "
317                                         "leaving read-only.\n");
318                         sb->s_flags |= MS_RDONLY;
319                         *flags |= MS_RDONLY;
320                 }
321         }
322         return 0;
323 }
324
325 static const struct super_operations hfsplus_sops = {
326         .alloc_inode    = hfsplus_alloc_inode,
327         .destroy_inode  = hfsplus_destroy_inode,
328         .write_inode    = hfsplus_write_inode,
329         .evict_inode    = hfsplus_evict_inode,
330         .put_super      = hfsplus_put_super,
331         .write_super    = hfsplus_write_super,
332         .sync_fs        = hfsplus_sync_fs,
333         .statfs         = hfsplus_statfs,
334         .remount_fs     = hfsplus_remount,
335         .show_options   = hfsplus_show_options,
336 };
337
338 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
339 {
340         struct hfsplus_vh *vhdr;
341         struct hfsplus_sb_info *sbi;
342         hfsplus_cat_entry entry;
343         struct hfs_find_data fd;
344         struct inode *root, *inode;
345         struct qstr str;
346         struct nls_table *nls = NULL;
347         int err;
348
349         err = -EINVAL;
350         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
351         if (!sbi)
352                 goto out;
353
354         sb->s_fs_info = sbi;
355         mutex_init(&sbi->alloc_mutex);
356         mutex_init(&sbi->vh_mutex);
357         hfsplus_fill_defaults(sbi);
358
359         err = -EINVAL;
360         if (!hfsplus_parse_options(data, sbi)) {
361                 printk(KERN_ERR "hfs: unable to parse mount options\n");
362                 goto out_unload_nls;
363         }
364
365         /* temporarily use utf8 to correctly find the hidden dir below */
366         nls = sbi->nls;
367         sbi->nls = load_nls("utf8");
368         if (!sbi->nls) {
369                 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
370                 goto out_unload_nls;
371         }
372
373         /* Grab the volume header */
374         if (hfsplus_read_wrapper(sb)) {
375                 if (!silent)
376                         printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
377                 goto out_unload_nls;
378         }
379         vhdr = sbi->s_vhdr;
380
381         /* Copy parts of the volume header into the superblock */
382         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
383         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
384             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
385                 printk(KERN_ERR "hfs: wrong filesystem version\n");
386                 goto out_free_vhdr;
387         }
388         sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
389         sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
390         sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
391         sbi->file_count = be32_to_cpu(vhdr->file_count);
392         sbi->folder_count = be32_to_cpu(vhdr->folder_count);
393         sbi->data_clump_blocks =
394                 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
395         if (!sbi->data_clump_blocks)
396                 sbi->data_clump_blocks = 1;
397         sbi->rsrc_clump_blocks =
398                 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
399         if (!sbi->rsrc_clump_blocks)
400                 sbi->rsrc_clump_blocks = 1;
401
402         err = generic_check_addressable(sbi->alloc_blksz_shift,
403                                         sbi->total_blocks);
404         if (err) {
405                 printk(KERN_ERR "hfs: filesystem size too large.\n");
406                 goto out_free_vhdr;
407         }
408
409         /* Set up operations so we can load metadata */
410         sb->s_op = &hfsplus_sops;
411         sb->s_maxbytes = MAX_LFS_FILESIZE;
412
413         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
414                 printk(KERN_WARNING "hfs: Filesystem was "
415                                 "not cleanly unmounted, "
416                                 "running fsck.hfsplus is recommended.  "
417                                 "mounting read-only.\n");
418                 sb->s_flags |= MS_RDONLY;
419         } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
420                 /* nothing */
421         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
422                 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
423                 sb->s_flags |= MS_RDONLY;
424         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
425                         !(sb->s_flags & MS_RDONLY)) {
426                 printk(KERN_WARNING "hfs: write access to "
427                                 "a journaled filesystem is not supported, "
428                                 "use the force option at your own risk, "
429                                 "mounting read-only.\n");
430                 sb->s_flags |= MS_RDONLY;
431         }
432
433         err = -EINVAL;
434
435         /* Load metadata objects (B*Trees) */
436         sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
437         if (!sbi->ext_tree) {
438                 printk(KERN_ERR "hfs: failed to load extents file\n");
439                 goto out_free_vhdr;
440         }
441         sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
442         if (!sbi->cat_tree) {
443                 printk(KERN_ERR "hfs: failed to load catalog file\n");
444                 goto out_close_ext_tree;
445         }
446
447         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
448         if (IS_ERR(inode)) {
449                 printk(KERN_ERR "hfs: failed to load allocation file\n");
450                 err = PTR_ERR(inode);
451                 goto out_close_cat_tree;
452         }
453         sbi->alloc_file = inode;
454
455         /* Load the root directory */
456         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
457         if (IS_ERR(root)) {
458                 printk(KERN_ERR "hfs: failed to load root directory\n");
459                 err = PTR_ERR(root);
460                 goto out_put_alloc_file;
461         }
462
463         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
464         str.name = HFSP_HIDDENDIR_NAME;
465         err = hfs_find_init(sbi->cat_tree, &fd);
466         if (err)
467                 goto out_put_root;
468         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
469         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
470                 hfs_find_exit(&fd);
471                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
472                         goto out_put_root;
473                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
474                 if (IS_ERR(inode)) {
475                         err = PTR_ERR(inode);
476                         goto out_put_root;
477                 }
478                 sbi->hidden_dir = inode;
479         } else
480                 hfs_find_exit(&fd);
481
482         if (!(sb->s_flags & MS_RDONLY)) {
483                 /*
484                  * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
485                  * all three are registered with Apple for our use
486                  */
487                 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
488                 vhdr->modify_date = hfsp_now2mt();
489                 be32_add_cpu(&vhdr->write_count, 1);
490                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
491                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
492                 hfsplus_sync_fs(sb, 1);
493
494                 if (!sbi->hidden_dir) {
495                         mutex_lock(&sbi->vh_mutex);
496                         sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
497                         hfsplus_create_cat(sbi->hidden_dir->i_ino, root, &str,
498                                            sbi->hidden_dir);
499                         mutex_unlock(&sbi->vh_mutex);
500
501                         hfsplus_mark_inode_dirty(sbi->hidden_dir,
502                                                  HFSPLUS_I_CAT_DIRTY);
503                 }
504         }
505
506         sb->s_d_op = &hfsplus_dentry_operations;
507         sb->s_root = d_alloc_root(root);
508         if (!sb->s_root) {
509                 err = -ENOMEM;
510                 goto out_put_hidden_dir;
511         }
512
513         unload_nls(sbi->nls);
514         sbi->nls = nls;
515         return 0;
516
517 out_put_hidden_dir:
518         iput(sbi->hidden_dir);
519 out_put_root:
520         iput(root);
521 out_put_alloc_file:
522         iput(sbi->alloc_file);
523 out_close_cat_tree:
524         hfs_btree_close(sbi->cat_tree);
525 out_close_ext_tree:
526         hfs_btree_close(sbi->ext_tree);
527 out_free_vhdr:
528         kfree(sbi->s_vhdr);
529         kfree(sbi->s_backup_vhdr);
530 out_unload_nls:
531         unload_nls(sbi->nls);
532         unload_nls(nls);
533         kfree(sbi);
534 out:
535         return err;
536 }
537
538 MODULE_AUTHOR("Brad Boyer");
539 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
540 MODULE_LICENSE("GPL");
541
542 static struct kmem_cache *hfsplus_inode_cachep;
543
544 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
545 {
546         struct hfsplus_inode_info *i;
547
548         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
549         return i ? &i->vfs_inode : NULL;
550 }
551
552 static void hfsplus_i_callback(struct rcu_head *head)
553 {
554         struct inode *inode = container_of(head, struct inode, i_rcu);
555
556         INIT_LIST_HEAD(&inode->i_dentry);
557         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
558 }
559
560 static void hfsplus_destroy_inode(struct inode *inode)
561 {
562         call_rcu(&inode->i_rcu, hfsplus_i_callback);
563 }
564
565 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
566
567 static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
568                           int flags, const char *dev_name, void *data)
569 {
570         return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
571 }
572
573 static struct file_system_type hfsplus_fs_type = {
574         .owner          = THIS_MODULE,
575         .name           = "hfsplus",
576         .mount          = hfsplus_mount,
577         .kill_sb        = kill_block_super,
578         .fs_flags       = FS_REQUIRES_DEV,
579 };
580
581 static void hfsplus_init_once(void *p)
582 {
583         struct hfsplus_inode_info *i = p;
584
585         inode_init_once(&i->vfs_inode);
586 }
587
588 static int __init init_hfsplus_fs(void)
589 {
590         int err;
591
592         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
593                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
594                 hfsplus_init_once);
595         if (!hfsplus_inode_cachep)
596                 return -ENOMEM;
597         err = register_filesystem(&hfsplus_fs_type);
598         if (err)
599                 kmem_cache_destroy(hfsplus_inode_cachep);
600         return err;
601 }
602
603 static void __exit exit_hfsplus_fs(void)
604 {
605         unregister_filesystem(&hfsplus_fs_type);
606         kmem_cache_destroy(hfsplus_inode_cachep);
607 }
608
609 module_init(init_hfsplus_fs)
610 module_exit(exit_hfsplus_fs)