xref: /openbmc/linux/fs/hfsplus/super.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
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/version.h>
18 #include <linux/vfs.h>
19 #include <linux/nls.h>
20 
21 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
22 static void hfsplus_destroy_inode(struct inode *inode);
23 
24 #include "hfsplus_fs.h"
25 
26 void hfsplus_inode_check(struct super_block *sb)
27 {
28 #if 0
29 	u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt);
30 	u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt;
31 
32 	if (cnt <= (last_cnt / 2) ||
33 	    cnt >= (last_cnt * 2)) {
34 		HFSPLUS_SB(sb).last_inode_cnt = cnt;
35 		printk("inode_check: %u,%u,%u\n", cnt, last_cnt,
36 			HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0);
37 	}
38 #endif
39 }
40 
41 static void hfsplus_read_inode(struct inode *inode)
42 {
43 	struct hfs_find_data fd;
44 	struct hfsplus_vh *vhdr;
45 	int err;
46 
47 	atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt);
48 	hfsplus_inode_check(inode->i_sb);
49 	INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
50 	init_MUTEX(&HFSPLUS_I(inode).extents_lock);
51 	HFSPLUS_I(inode).flags = 0;
52 	HFSPLUS_I(inode).rsrc_inode = NULL;
53 	atomic_set(&HFSPLUS_I(inode).opencnt, 0);
54 
55 	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
56 	read_inode:
57 		hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
58 		err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
59 		if (!err)
60 			err = hfsplus_cat_read_inode(inode, &fd);
61 		hfs_find_exit(&fd);
62 		if (err)
63 			goto bad_inode;
64 		return;
65 	}
66 	vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
67 	switch(inode->i_ino) {
68 	case HFSPLUS_ROOT_CNID:
69 		goto read_inode;
70 	case HFSPLUS_EXT_CNID:
71 		hfsplus_inode_read_fork(inode, &vhdr->ext_file);
72 		inode->i_mapping->a_ops = &hfsplus_btree_aops;
73 		break;
74 	case HFSPLUS_CAT_CNID:
75 		hfsplus_inode_read_fork(inode, &vhdr->cat_file);
76 		inode->i_mapping->a_ops = &hfsplus_btree_aops;
77 		break;
78 	case HFSPLUS_ALLOC_CNID:
79 		hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
80 		inode->i_mapping->a_ops = &hfsplus_aops;
81 		break;
82 	case HFSPLUS_START_CNID:
83 		hfsplus_inode_read_fork(inode, &vhdr->start_file);
84 		break;
85 	case HFSPLUS_ATTR_CNID:
86 		hfsplus_inode_read_fork(inode, &vhdr->attr_file);
87 		inode->i_mapping->a_ops = &hfsplus_btree_aops;
88 		break;
89 	default:
90 		goto bad_inode;
91 	}
92 
93 	return;
94 
95  bad_inode:
96 	make_bad_inode(inode);
97 }
98 
99 static int hfsplus_write_inode(struct inode *inode, int unused)
100 {
101 	struct hfsplus_vh *vhdr;
102 	int ret = 0;
103 
104 	dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
105 	hfsplus_ext_write_extent(inode);
106 	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
107 		return hfsplus_cat_write_inode(inode);
108 	}
109 	vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
110 	switch (inode->i_ino) {
111 	case HFSPLUS_ROOT_CNID:
112 		ret = hfsplus_cat_write_inode(inode);
113 		break;
114 	case HFSPLUS_EXT_CNID:
115 		if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
116 			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
117 			inode->i_sb->s_dirt = 1;
118 		}
119 		hfsplus_inode_write_fork(inode, &vhdr->ext_file);
120 		hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
121 		break;
122 	case HFSPLUS_CAT_CNID:
123 		if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
124 			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
125 			inode->i_sb->s_dirt = 1;
126 		}
127 		hfsplus_inode_write_fork(inode, &vhdr->cat_file);
128 		hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
129 		break;
130 	case HFSPLUS_ALLOC_CNID:
131 		if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
132 			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
133 			inode->i_sb->s_dirt = 1;
134 		}
135 		hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
136 		break;
137 	case HFSPLUS_START_CNID:
138 		if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
139 			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
140 			inode->i_sb->s_dirt = 1;
141 		}
142 		hfsplus_inode_write_fork(inode, &vhdr->start_file);
143 		break;
144 	case HFSPLUS_ATTR_CNID:
145 		if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
146 			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
147 			inode->i_sb->s_dirt = 1;
148 		}
149 		hfsplus_inode_write_fork(inode, &vhdr->attr_file);
150 		hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
151 		break;
152 	}
153 	return ret;
154 }
155 
156 static void hfsplus_clear_inode(struct inode *inode)
157 {
158 	dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
159 	atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt);
160 	if (HFSPLUS_IS_RSRC(inode)) {
161 		HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
162 		iput(HFSPLUS_I(inode).rsrc_inode);
163 	}
164 	hfsplus_inode_check(inode->i_sb);
165 }
166 
167 static void hfsplus_write_super(struct super_block *sb)
168 {
169 	struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
170 
171 	dprint(DBG_SUPER, "hfsplus_write_super\n");
172 	sb->s_dirt = 0;
173 	if (sb->s_flags & MS_RDONLY)
174 		/* warn? */
175 		return;
176 
177 	vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
178 	vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
179 	vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
180 	vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
181 	vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
182 
183 	mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
184 	if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
185 		if (HFSPLUS_SB(sb).sect_count) {
186 			struct buffer_head *bh;
187 			u32 block, offset;
188 
189 			block = HFSPLUS_SB(sb).blockoffset;
190 			block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
191 			offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
192 			printk("backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
193 				HFSPLUS_SB(sb).sect_count, block, offset);
194 			bh = sb_bread(sb, block);
195 			if (bh) {
196 				vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
197 				if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
198 					memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
199 					mark_buffer_dirty(bh);
200 					brelse(bh);
201 				} else
202 					printk("backup not found!\n");
203 			}
204 		}
205 		HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
206 	}
207 }
208 
209 static void hfsplus_put_super(struct super_block *sb)
210 {
211 	dprint(DBG_SUPER, "hfsplus_put_super\n");
212 	if (!sb->s_fs_info)
213 		return;
214 	if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
215 		struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
216 
217 		vhdr->modify_date = hfsp_now2mt();
218 		vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
219 		vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
220 		mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
221 		sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
222 	}
223 
224 	hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
225 	hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
226 	iput(HFSPLUS_SB(sb).alloc_file);
227 	iput(HFSPLUS_SB(sb).hidden_dir);
228 	brelse(HFSPLUS_SB(sb).s_vhbh);
229 	if (HFSPLUS_SB(sb).nls)
230 		unload_nls(HFSPLUS_SB(sb).nls);
231 	kfree(sb->s_fs_info);
232 	sb->s_fs_info = NULL;
233 }
234 
235 static int hfsplus_statfs(struct super_block *sb, struct kstatfs *buf)
236 {
237 	buf->f_type = HFSPLUS_SUPER_MAGIC;
238 	buf->f_bsize = sb->s_blocksize;
239 	buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
240 	buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
241 	buf->f_bavail = buf->f_bfree;
242 	buf->f_files = 0xFFFFFFFF;
243 	buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
244 	buf->f_namelen = HFSPLUS_MAX_STRLEN;
245 
246 	return 0;
247 }
248 
249 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
250 {
251 	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
252 		return 0;
253 	if (!(*flags & MS_RDONLY)) {
254 		struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
255 
256 		if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
257 			printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
258 			       "running fsck.hfsplus is recommended.  leaving read-only.\n");
259 			sb->s_flags |= MS_RDONLY;
260 			*flags |= MS_RDONLY;
261 		} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
262 			printk("HFS+-fs: Filesystem is marked locked, leaving read-only.\n");
263 			sb->s_flags |= MS_RDONLY;
264 			*flags |= MS_RDONLY;
265 		}
266 	}
267 	return 0;
268 }
269 
270 static struct super_operations hfsplus_sops = {
271 	.alloc_inode	= hfsplus_alloc_inode,
272 	.destroy_inode	= hfsplus_destroy_inode,
273 	.read_inode	= hfsplus_read_inode,
274 	.write_inode	= hfsplus_write_inode,
275 	.clear_inode	= hfsplus_clear_inode,
276 	.put_super	= hfsplus_put_super,
277 	.write_super	= hfsplus_write_super,
278 	.statfs		= hfsplus_statfs,
279 	.remount_fs	= hfsplus_remount,
280 	.show_options	= hfsplus_show_options,
281 };
282 
283 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
284 {
285 	struct hfsplus_vh *vhdr;
286 	struct hfsplus_sb_info *sbi;
287 	hfsplus_cat_entry entry;
288 	struct hfs_find_data fd;
289 	struct inode *root;
290 	struct qstr str;
291 	struct nls_table *nls = NULL;
292 	int err = -EINVAL;
293 
294 	sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
295 	if (!sbi)
296 		return -ENOMEM;
297 
298 	memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
299 	sb->s_fs_info = sbi;
300 	INIT_HLIST_HEAD(&sbi->rsrc_inodes);
301 	hfsplus_fill_defaults(sbi);
302 	if (!hfsplus_parse_options(data, sbi)) {
303 		if (!silent)
304 			printk("HFS+-fs: unable to parse mount options\n");
305 		err = -EINVAL;
306 		goto cleanup;
307 	}
308 
309 	/* temporarily use utf8 to correctly find the hidden dir below */
310 	nls = sbi->nls;
311 	sbi->nls = load_nls("utf8");
312 	if (!nls) {
313 		printk("HFS+: unable to load nls for utf8\n");
314 		err = -EINVAL;
315 		goto cleanup;
316 	}
317 
318 	/* Grab the volume header */
319 	if (hfsplus_read_wrapper(sb)) {
320 		if (!silent)
321 			printk("HFS+-fs: unable to find HFS+ superblock\n");
322 		err = -EINVAL;
323 		goto cleanup;
324 	}
325 	vhdr = HFSPLUS_SB(sb).s_vhdr;
326 
327 	/* Copy parts of the volume header into the superblock */
328 	sb->s_magic = be16_to_cpu(vhdr->signature);
329 	if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) {
330 		if (!silent)
331 			printk("HFS+-fs: wrong filesystem version\n");
332 		goto cleanup;
333 	}
334 	HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
335 	HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
336 	HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
337 	HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
338 	HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
339 	HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
340 	HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
341 	if (!HFSPLUS_SB(sb).data_clump_blocks)
342 		HFSPLUS_SB(sb).data_clump_blocks = 1;
343 	HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
344 	if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
345 		HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
346 
347 	/* Set up operations so we can load metadata */
348 	sb->s_op = &hfsplus_sops;
349 	sb->s_maxbytes = MAX_LFS_FILESIZE;
350 
351 	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
352 		if (!silent)
353 			printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
354 			       "running fsck.hfsplus is recommended.  mounting read-only.\n");
355 		sb->s_flags |= MS_RDONLY;
356 	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
357 		if (!silent)
358 			printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
359 		sb->s_flags |= MS_RDONLY;
360 	}
361 
362 	/* Load metadata objects (B*Trees) */
363 	HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
364 	if (!HFSPLUS_SB(sb).ext_tree) {
365 		if (!silent)
366 			printk("HFS+-fs: failed to load extents file\n");
367 		goto cleanup;
368 	}
369 	HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
370 	if (!HFSPLUS_SB(sb).cat_tree) {
371 		if (!silent)
372 			printk("HFS+-fs: failed to load catalog file\n");
373 		goto cleanup;
374 	}
375 
376 	HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
377 	if (!HFSPLUS_SB(sb).alloc_file) {
378 		if (!silent)
379 			printk("HFS+-fs: failed to load allocation file\n");
380 		goto cleanup;
381 	}
382 
383 	/* Load the root directory */
384 	root = iget(sb, HFSPLUS_ROOT_CNID);
385 	sb->s_root = d_alloc_root(root);
386 	if (!sb->s_root) {
387 		if (!silent)
388 			printk("HFS+-fs: failed to load root directory\n");
389 		iput(root);
390 		goto cleanup;
391 	}
392 
393 	str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
394 	str.name = HFSP_HIDDENDIR_NAME;
395 	hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
396 	hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
397 	if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
398 		hfs_find_exit(&fd);
399 		if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
400 			goto cleanup;
401 		HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
402 		if (!HFSPLUS_SB(sb).hidden_dir)
403 			goto cleanup;
404 	} else
405 		hfs_find_exit(&fd);
406 
407 	if (sb->s_flags & MS_RDONLY)
408 		goto out;
409 
410 	/* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
411 	 * all three are registered with Apple for our use
412 	 */
413 	vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
414 	vhdr->modify_date = hfsp_now2mt();
415 	vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
416 	vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
417 	vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
418 	mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
419 	sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
420 
421 	if (!HFSPLUS_SB(sb).hidden_dir) {
422 		printk("HFS+: create hidden dir...\n");
423 		HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
424 		hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
425 				   &str, HFSPLUS_SB(sb).hidden_dir);
426 		mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
427 	}
428 out:
429 	unload_nls(sbi->nls);
430 	sbi->nls = nls;
431 	return 0;
432 
433 cleanup:
434 	hfsplus_put_super(sb);
435 	if (nls)
436 		unload_nls(nls);
437 	return err;
438 }
439 
440 MODULE_AUTHOR("Brad Boyer");
441 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
442 MODULE_LICENSE("GPL");
443 
444 static kmem_cache_t *hfsplus_inode_cachep;
445 
446 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
447 {
448 	struct hfsplus_inode_info *i;
449 
450 	i = kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL);
451 	return i ? &i->vfs_inode : NULL;
452 }
453 
454 static void hfsplus_destroy_inode(struct inode *inode)
455 {
456 	kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
457 }
458 
459 #define HFSPLUS_INODE_SIZE	sizeof(struct hfsplus_inode_info)
460 
461 static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type,
462 					  int flags, const char *dev_name, void *data)
463 {
464 	return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
465 }
466 
467 static struct file_system_type hfsplus_fs_type = {
468 	.owner		= THIS_MODULE,
469 	.name		= "hfsplus",
470 	.get_sb		= hfsplus_get_sb,
471 	.kill_sb	= kill_block_super,
472 	.fs_flags	= FS_REQUIRES_DEV,
473 };
474 
475 static void hfsplus_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
476 {
477 	struct hfsplus_inode_info *i = p;
478 
479 	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
480 		inode_init_once(&i->vfs_inode);
481 }
482 
483 static int __init init_hfsplus_fs(void)
484 {
485 	int err;
486 
487 	hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
488 		HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
489 		hfsplus_init_once, NULL);
490 	if (!hfsplus_inode_cachep)
491 		return -ENOMEM;
492 	err = register_filesystem(&hfsplus_fs_type);
493 	if (err)
494 		kmem_cache_destroy(hfsplus_inode_cachep);
495 	return err;
496 }
497 
498 static void __exit exit_hfsplus_fs(void)
499 {
500 	unregister_filesystem(&hfsplus_fs_type);
501 	if (kmem_cache_destroy(hfsplus_inode_cachep))
502 		printk(KERN_INFO "hfsplus_inode_cache: not all structures were freed\n");
503 }
504 
505 module_init(init_hfsplus_fs)
506 module_exit(exit_hfsplus_fs)
507