xref: /openbmc/linux/fs/hfsplus/super.c (revision 87c2ce3b)
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 (!sbi->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)
526