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Merge branch 'master'
[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/config.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/pagemap.h>
14 #include <linux/fs.h>
15 #include <linux/sched.h>
16 #include <linux/slab.h>
17 #include <linux/vfs.h>
18 #include <linux/nls.h>
19
20 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
21 static void hfsplus_destroy_inode(struct inode *inode);
22
23 #include "hfsplus_fs.h"
24
25 void hfsplus_inode_check(struct super_block *sb)
26 {
27 #if 0
28         u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt);
29         u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt;
30
31         if (cnt <= (last_cnt / 2) ||
32             cnt >= (last_cnt * 2)) {
33                 HFSPLUS_SB(sb).last_inode_cnt = cnt;
34                 printk("inode_check: %u,%u,%u\n", cnt, last_cnt,
35                         HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0);
36         }
37 #endif
38 }
39
40 static void hfsplus_read_inode(struct inode *inode)
41 {
42         struct hfs_find_data fd;
43         struct hfsplus_vh *vhdr;
44         int err;
45
46         atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt);
47         hfsplus_inode_check(inode->i_sb);
48         INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
49         init_MUTEX(&HFSPLUS_I(inode).extents_lock);
50         HFSPLUS_I(inode).flags = 0;
51         HFSPLUS_I(inode).rsrc_inode = NULL;
52         atomic_set(&HFSPLUS_I(inode).opencnt, 0);
53
54         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
55         read_inode:
56                 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
57                 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
58                 if (!err)
59                         err = hfsplus_cat_read_inode(inode, &fd);
60                 hfs_find_exit(&fd);
61                 if (err)
62                         goto bad_inode;
63                 return;
64         }
65         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
66         switch(inode->i_ino) {
67         case HFSPLUS_ROOT_CNID:
68                 goto read_inode;
69         case HFSPLUS_EXT_CNID:
70                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
71                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
72                 break;
73         case HFSPLUS_CAT_CNID:
74                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
75                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
76                 break;
77         case HFSPLUS_ALLOC_CNID:
78                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
79                 inode->i_mapping->a_ops = &hfsplus_aops;
80                 break;
81         case HFSPLUS_START_CNID:
82                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
83                 break;
84         case HFSPLUS_ATTR_CNID:
85                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
86                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
87                 break;
88         default:
89                 goto bad_inode;
90         }
91
92         return;
93
94  bad_inode:
95         make_bad_inode(inode);
96 }
97
98 static int hfsplus_write_inode(struct inode *inode, int unused)
99 {
100         struct hfsplus_vh *vhdr;
101         int ret = 0;
102
103         dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
104         hfsplus_ext_write_extent(inode);
105         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
106                 return hfsplus_cat_write_inode(inode);
107         }
108         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
109         switch (inode->i_ino) {
110         case HFSPLUS_ROOT_CNID:
111                 ret = hfsplus_cat_write_inode(inode);
112                 break;
113         case HFSPLUS_EXT_CNID:
114                 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
115                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
116                         inode->i_sb->s_dirt = 1;
117                 }
118                 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
119                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
120                 break;
121         case HFSPLUS_CAT_CNID:
122                 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
123                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
124                         inode->i_sb->s_dirt = 1;
125                 }
126                 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
127                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
128                 break;
129         case HFSPLUS_ALLOC_CNID:
130                 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
131                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
132                         inode->i_sb->s_dirt = 1;
133                 }
134                 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
135                 break;
136         case HFSPLUS_START_CNID:
137                 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
138                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
139                         inode->i_sb->s_dirt = 1;
140                 }
141                 hfsplus_inode_write_fork(inode, &vhdr->start_file);
142                 break;
143         case HFSPLUS_ATTR_CNID:
144                 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
145                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
146                         inode->i_sb->s_dirt = 1;
147                 }
148                 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
149                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
150                 break;
151         }
152         return ret;
153 }
154
155 static void hfsplus_clear_inode(struct inode *inode)
156 {
157         dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
158         atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt);
159         if (HFSPLUS_IS_RSRC(inode)) {
160                 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
161                 iput(HFSPLUS_I(inode).rsrc_inode);
162         }
163         hfsplus_inode_check(inode->i_sb);
164 }
165
166 static void hfsplus_write_super(struct super_block *sb)
167 {
168         struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
169
170         dprint(DBG_SUPER, "hfsplus_write_super\n");
171         sb->s_dirt = 0;
172         if (sb->s_flags & MS_RDONLY)
173                 /* warn? */
174                 return;
175
176         vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
177         vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
178         vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
179         vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
180         vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
181
182         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
183         if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
184                 if (HFSPLUS_SB(sb).sect_count) {
185                         struct buffer_head *bh;
186                         u32 block, offset;
187
188                         block = HFSPLUS_SB(sb).blockoffset;
189                         block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
190                         offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
191                         printk("backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
192                                 HFSPLUS_SB(sb).sect_count, block, offset);
193                         bh = sb_bread(sb, block);
194                         if (bh) {
195                                 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
196                                 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
197                                         memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
198                                         mark_buffer_dirty(bh);
199                                         brelse(bh);
200                                 } else
201                                         printk("backup not found!\n");
202                         }
203                 }
204                 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
205         }
206 }
207
208 static void hfsplus_put_super(struct super_block *sb)
209 {
210         dprint(DBG_SUPER, "hfsplus_put_super\n");
211         if (!sb->s_fs_info)
212                 return;
213         if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
214                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
215
216                 vhdr->modify_date = hfsp_now2mt();
217                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
218                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
219                 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
220                 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
221         }
222
223         hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
224         hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
225         iput(HFSPLUS_SB(sb).alloc_file);
226         iput(HFSPLUS_SB(sb).hidden_dir);
227         brelse(HFSPLUS_SB(sb).s_vhbh);
228         if (HFSPLUS_SB(sb).nls)
229                 unload_nls(HFSPLUS_SB(sb).nls);
230         kfree(sb->s_fs_info);
231         sb->s_fs_info = NULL;
232 }
233
234 static int hfsplus_statfs(struct super_block *sb, struct kstatfs *buf)
235 {
236         buf->f_type = HFSPLUS_SUPER_MAGIC;
237         buf->f_bsize = sb->s_blocksize;
238         buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
239         buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
240         buf->f_bavail = buf->f_bfree;
241         buf->f_files = 0xFFFFFFFF;
242         buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
243         buf->f_namelen = HFSPLUS_MAX_STRLEN;
244
245         return 0;
246 }
247
248 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
249 {
250         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
251                 return 0;
252         if (!(*flags & MS_RDONLY)) {
253                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
254                 struct hfsplus_sb_info sbi;
255
256                 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
257                 sbi.nls = HFSPLUS_SB(sb).nls;
258                 if (!hfsplus_parse_options(data, &sbi))
259                         return -EINVAL;
260
261                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
262                         printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
263                                "running fsck.hfsplus is recommended.  leaving read-only.\n");
264                         sb->s_flags |= MS_RDONLY;
265                         *flags |= MS_RDONLY;
266                 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
267                         /* nothing */
268                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
269                         printk("HFS+-fs: Filesystem is marked locked, leaving read-only.\n");
270                         sb->s_flags |= MS_RDONLY;
271                         *flags |= MS_RDONLY;
272                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
273                         printk("HFS+-fs: Filesystem is marked journaled, leaving read-only.\n");
274                         sb->s_flags |= MS_RDONLY;
275                         *flags |= MS_RDONLY;
276                 }
277         }
278         return 0;
279 }
280
281 static struct super_operations hfsplus_sops = {
282         .alloc_inode    = hfsplus_alloc_inode,
283         .destroy_inode  = hfsplus_destroy_inode,
284         .read_inode     = hfsplus_read_inode,
285         .write_inode    = hfsplus_write_inode,
286         .clear_inode    = hfsplus_clear_inode,
287         .put_super      = hfsplus_put_super,
288         .write_super    = hfsplus_write_super,
289         .statfs         = hfsplus_statfs,
290         .remount_fs     = hfsplus_remount,
291         .show_options   = hfsplus_show_options,
292 };
293
294 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
295 {
296         struct hfsplus_vh *vhdr;
297         struct hfsplus_sb_info *sbi;
298         hfsplus_cat_entry entry;
299         struct hfs_find_data fd;
300         struct inode *root;
301         struct qstr str;
302         struct nls_table *nls = NULL;
303         int err = -EINVAL;
304
305         sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
306         if (!sbi)
307                 return -ENOMEM;
308
309         memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
310         sb->s_fs_info = sbi;
311         INIT_HLIST_HEAD(&sbi->rsrc_inodes);
312         hfsplus_fill_defaults(sbi);
313         if (!hfsplus_parse_options(data, sbi)) {
314                 if (!silent)
315                         printk("HFS+-fs: unable to parse mount options\n");
316                 err = -EINVAL;
317                 goto cleanup;
318         }
319
320         /* temporarily use utf8 to correctly find the hidden dir below */
321         nls = sbi->nls;
322         sbi->nls = load_nls("utf8");
323         if (!nls) {
324                 printk("HFS+: unable to load nls for utf8\n");
325                 err = -EINVAL;
326                 goto cleanup;
327         }
328
329         /* Grab the volume header */
330         if (hfsplus_read_wrapper(sb)) {
331                 if (!silent)
332                         printk("HFS+-fs: unable to find HFS+ superblock\n");
333                 err = -EINVAL;
334                 goto cleanup;
335         }
336         vhdr = HFSPLUS_SB(sb).s_vhdr;
337
338         /* Copy parts of the volume header into the superblock */
339         sb->s_magic = be16_to_cpu(vhdr->signature);
340         if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) {
341                 if (!silent)
342                         printk("HFS+-fs: wrong filesystem version\n");
343                 goto cleanup;
344         }
345         HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
346         HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
347         HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
348         HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
349         HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
350         HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
351         HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
352         if (!HFSPLUS_SB(sb).data_clump_blocks)
353                 HFSPLUS_SB(sb).data_clump_blocks = 1;
354         HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
355         if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
356                 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
357
358         /* Set up operations so we can load metadata */
359         sb->s_op = &hfsplus_sops;
360         sb->s_maxbytes = MAX_LFS_FILESIZE;
361
362         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
363                 if (!silent)
364                         printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
365                                "running fsck.hfsplus is recommended.  mounting read-only.\n");
366                 sb->s_flags |= MS_RDONLY;
367         } else if (sbi->flags & HFSPLUS_SB_FORCE) {
368                 /* nothing */
369         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
370                 if (!silent)
371                         printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
372                 sb->s_flags |= MS_RDONLY;
373         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
374                 if (!silent)
375                         printk("HFS+-fs: write access to a jounaled filesystem is not supported, "
376                                "use the force option at your own risk, mounting read-only.\n");
377                 sb->s_flags |= MS_RDONLY;
378         }
379         sbi->flags &= ~HFSPLUS_SB_FORCE;
380
381         /* Load metadata objects (B*Trees) */
382         HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
383         if (!HFSPLUS_SB(sb).ext_tree) {
384                 if (!silent)
385                         printk("HFS+-fs: failed to load extents file\n");
386                 goto cleanup;
387         }
388         HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
389         if (!HFSPLUS_SB(sb).cat_tree) {
390                 if (!silent)
391                         printk("HFS+-fs: failed to load catalog file\n");
392                 goto cleanup;
393         }
394
395         HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
396         if (!HFSPLUS_SB(sb).alloc_file) {
397                 if (!silent)
398                         printk("HFS+-fs: failed to load allocation file\n");
399                 goto cleanup;
400         }
401
402         /* Load the root directory */
403         root = iget(sb, HFSPLUS_ROOT_CNID);
404         sb->s_root = d_alloc_root(root);
405         if (!sb->s_root) {
406                 if (!silent)
407                         printk("HFS+-fs: failed to load root directory\n");
408                 iput(root);
409                 goto cleanup;
410         }
411
412         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
413         str.name = HFSP_HIDDENDIR_NAME;
414         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
415         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
416         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
417                 hfs_find_exit(&fd);
418                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
419                         goto cleanup;
420                 HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
421                 if (!HFSPLUS_SB(sb).hidden_dir)
422                         goto cleanup;
423         } else
424                 hfs_find_exit(&fd);
425
426         if (sb->s_flags & MS_RDONLY)
427                 goto out;
428
429         /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
430          * all three are registered with Apple for our use
431          */
432         vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
433         vhdr->modify_date = hfsp_now2mt();
434         vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
435         vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
436         vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
437         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
438         sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
439
440         if (!HFSPLUS_SB(sb).hidden_dir) {
441                 printk("HFS+: create hidden dir...\n");
442                 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
443                 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
444                                    &str, HFSPLUS_SB(sb).hidden_dir);
445                 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
446         }
447 out:
448         unload_nls(sbi->nls);
449         sbi->nls = nls;
450         return 0;
451
452 cleanup:
453         hfsplus_put_super(sb);
454         if (nls)
455                 unload_nls(nls);
456         return err;
457 }
458
459 MODULE_AUTHOR("Brad Boyer");
460 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
461 MODULE_LICENSE("GPL");
462
463 static kmem_cache_t *hfsplus_inode_cachep;
464
465 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
466 {
467         struct hfsplus_inode_info *i;
468
469         i = kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL);
470         return i ? &i->vfs_inode : NULL;
471 }
472
473 static void hfsplus_destroy_inode(struct inode *inode)
474 {
475         kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
476 }
477
478 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
479
480 static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type,
481                                           int flags, const char *dev_name, void *data)
482 {
483         return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
484 }
485
486 static struct file_system_type hfsplus_fs_type = {
487         .owner          = THIS_MODULE,
488         .name           = "hfsplus",
489         .get_sb         = hfsplus_get_sb,
490         .kill_sb        = kill_block_super,
491         .fs_flags       = FS_REQUIRES_DEV,
492 };
493
494 static void hfsplus_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
495 {
496         struct hfsplus_inode_info *i = p;
497
498         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
499                 inode_init_once(&i->vfs_inode);
500 }
501
502 static int __init init_hfsplus_fs(void)
503 {
504         int err;
505
506         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
507                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
508                 hfsplus_init_once, NULL);
509         if (!hfsplus_inode_cachep)
510                 return -ENOMEM;
511         err = register_filesystem(&hfsplus_fs_type);
512         if (err)
513                 kmem_cache_destroy(hfsplus_inode_cachep);
514         return err;
515 }
516
517 static void __exit exit_hfsplus_fs(void)
518 {
519         unregister_filesystem(&hfsplus_fs_type);
520         if (kmem_cache_destroy(hfsplus_inode_cachep))
521                 printk(KERN_INFO "hfsplus_inode_cache: not all structures were freed\n");
522 }
523
524 module_init(init_hfsplus_fs)
525 module_exit(exit_hfsplus_fs)