xref: /openbmc/linux/fs/hfsplus/super.c (revision b04b4f78)
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)
521