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
19static struct inode *hfsplus_alloc_inode(struct super_block *sb);
20static void hfsplus_destroy_inode(struct inode *inode);
21
22#include "hfsplus_fs.h"
23#include "xattr.h"
24
25static int hfsplus_system_read_inode(struct inode *inode)
26{
27	struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
28
29	switch (inode->i_ino) {
30	case HFSPLUS_EXT_CNID:
31		hfsplus_inode_read_fork(inode, &vhdr->ext_file);
32		inode->i_mapping->a_ops = &hfsplus_btree_aops;
33		break;
34	case HFSPLUS_CAT_CNID:
35		hfsplus_inode_read_fork(inode, &vhdr->cat_file);
36		inode->i_mapping->a_ops = &hfsplus_btree_aops;
37		break;
38	case HFSPLUS_ALLOC_CNID:
39		hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
40		inode->i_mapping->a_ops = &hfsplus_aops;
41		break;
42	case HFSPLUS_START_CNID:
43		hfsplus_inode_read_fork(inode, &vhdr->start_file);
44		break;
45	case HFSPLUS_ATTR_CNID:
46		hfsplus_inode_read_fork(inode, &vhdr->attr_file);
47		inode->i_mapping->a_ops = &hfsplus_btree_aops;
48		break;
49	default:
50		return -EIO;
51	}
52
53	return 0;
54}
55
56struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
57{
58	struct hfs_find_data fd;
59	struct inode *inode;
60	int err;
61
62	inode = iget_locked(sb, ino);
63	if (!inode)
64		return ERR_PTR(-ENOMEM);
65	if (!(inode->i_state & I_NEW))
66		return inode;
67
68	INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
69	mutex_init(&HFSPLUS_I(inode)->extents_lock);
70	HFSPLUS_I(inode)->flags = 0;
71	HFSPLUS_I(inode)->extent_state = 0;
72	HFSPLUS_I(inode)->rsrc_inode = NULL;
73	atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
74
75	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
76	    inode->i_ino == HFSPLUS_ROOT_CNID) {
77		err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
78		if (!err) {
79			err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
80			if (!err)
81				err = hfsplus_cat_read_inode(inode, &fd);
82			hfs_find_exit(&fd);
83		}
84	} else {
85		err = hfsplus_system_read_inode(inode);
86	}
87
88	if (err) {
89		iget_failed(inode);
90		return ERR_PTR(err);
91	}
92
93	unlock_new_inode(inode);
94	return inode;
95}
96
97static int hfsplus_system_write_inode(struct inode *inode)
98{
99	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
100	struct hfsplus_vh *vhdr = sbi->s_vhdr;
101	struct hfsplus_fork_raw *fork;
102	struct hfs_btree *tree = NULL;
103
104	switch (inode->i_ino) {
105	case HFSPLUS_EXT_CNID:
106		fork = &vhdr->ext_file;
107		tree = sbi->ext_tree;
108		break;
109	case HFSPLUS_CAT_CNID:
110		fork = &vhdr->cat_file;
111		tree = sbi->cat_tree;
112		break;
113	case HFSPLUS_ALLOC_CNID:
114		fork = &vhdr->alloc_file;
115		break;
116	case HFSPLUS_START_CNID:
117		fork = &vhdr->start_file;
118		break;
119	case HFSPLUS_ATTR_CNID:
120		fork = &vhdr->attr_file;
121		tree = sbi->attr_tree;
122		break;
123	default:
124		return -EIO;
125	}
126
127	if (fork->total_size != cpu_to_be64(inode->i_size)) {
128		set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
129		hfsplus_mark_mdb_dirty(inode->i_sb);
130	}
131	hfsplus_inode_write_fork(inode, fork);
132	if (tree) {
133		int err = hfs_btree_write(tree);
134
135		if (err) {
136			pr_err("b-tree write err: %d, ino %lu\n",
137			       err, inode->i_ino);
138			return err;
139		}
140	}
141	return 0;
142}
143
144static int hfsplus_write_inode(struct inode *inode,
145		struct writeback_control *wbc)
146{
147	int err;
148
149	hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
150
151	err = hfsplus_ext_write_extent(inode);
152	if (err)
153		return err;
154
155	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
156	    inode->i_ino == HFSPLUS_ROOT_CNID)
157		return hfsplus_cat_write_inode(inode);
158	else
159		return hfsplus_system_write_inode(inode);
160}
161
162static void hfsplus_evict_inode(struct inode *inode)
163{
164	hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
165	truncate_inode_pages_final(&inode->i_data);
166	clear_inode(inode);
167	if (HFSPLUS_IS_RSRC(inode)) {
168		HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
169		iput(HFSPLUS_I(inode)->rsrc_inode);
170	}
171}
172
173static int hfsplus_sync_fs(struct super_block *sb, int wait)
174{
175	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
176	struct hfsplus_vh *vhdr = sbi->s_vhdr;
177	int write_backup = 0;
178	int error, error2;
179
180	if (!wait)
181		return 0;
182
183	hfs_dbg(SUPER, "hfsplus_sync_fs\n");
184
185	/*
186	 * Explicitly write out the special metadata inodes.
187	 *
188	 * While these special inodes are marked as hashed and written
189	 * out peridocically by the flusher threads we redirty them
190	 * during writeout of normal inodes, and thus the life lock
191	 * prevents us from getting the latest state to disk.
192	 */
193	error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
194	error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
195	if (!error)
196		error = error2;
197	if (sbi->attr_tree) {
198		error2 =
199		    filemap_write_and_wait(sbi->attr_tree->inode->i_mapping);
200		if (!error)
201			error = error2;
202	}
203	error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
204	if (!error)
205		error = error2;
206
207	mutex_lock(&sbi->vh_mutex);
208	mutex_lock(&sbi->alloc_mutex);
209	vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
210	vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
211	vhdr->folder_count = cpu_to_be32(sbi->folder_count);
212	vhdr->file_count = cpu_to_be32(sbi->file_count);
213
214	if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
215		memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
216		write_backup = 1;
217	}
218
219	error2 = hfsplus_submit_bio(sb,
220				   sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
221				   sbi->s_vhdr_buf, NULL, WRITE_SYNC);
222	if (!error)
223		error = error2;
224	if (!write_backup)
225		goto out;
226
227	error2 = hfsplus_submit_bio(sb,
228				  sbi->part_start + sbi->sect_count - 2,
229				  sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC);
230	if (!error)
231		error2 = error;
232out:
233	mutex_unlock(&sbi->alloc_mutex);
234	mutex_unlock(&sbi->vh_mutex);
235
236	if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
237		blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
238
239	return error;
240}
241
242static void delayed_sync_fs(struct work_struct *work)
243{
244	int err;
245	struct hfsplus_sb_info *sbi;
246
247	sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
248
249	spin_lock(&sbi->work_lock);
250	sbi->work_queued = 0;
251	spin_unlock(&sbi->work_lock);
252
253	err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
254	if (err)
255		pr_err("delayed sync fs err %d\n", err);
256}
257
258void hfsplus_mark_mdb_dirty(struct super_block *sb)
259{
260	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
261	unsigned long delay;
262
263	if (sb->s_flags & MS_RDONLY)
264		return;
265
266	spin_lock(&sbi->work_lock);
267	if (!sbi->work_queued) {
268		delay = msecs_to_jiffies(dirty_writeback_interval * 10);
269		queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
270		sbi->work_queued = 1;
271	}
272	spin_unlock(&sbi->work_lock);
273}
274
275static void hfsplus_put_super(struct super_block *sb)
276{
277	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
278
279	hfs_dbg(SUPER, "hfsplus_put_super\n");
280
281	cancel_delayed_work_sync(&sbi->sync_work);
282
283	if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
284		struct hfsplus_vh *vhdr = sbi->s_vhdr;
285
286		vhdr->modify_date = hfsp_now2mt();
287		vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
288		vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
289
290		hfsplus_sync_fs(sb, 1);
291	}
292
293	hfs_btree_close(sbi->attr_tree);
294	hfs_btree_close(sbi->cat_tree);
295	hfs_btree_close(sbi->ext_tree);
296	iput(sbi->alloc_file);
297	iput(sbi->hidden_dir);
298	kfree(sbi->s_vhdr_buf);
299	kfree(sbi->s_backup_vhdr_buf);
300	unload_nls(sbi->nls);
301	kfree(sb->s_fs_info);
302	sb->s_fs_info = NULL;
303}
304
305static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
306{
307	struct super_block *sb = dentry->d_sb;
308	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
309	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
310
311	buf->f_type = HFSPLUS_SUPER_MAGIC;
312	buf->f_bsize = sb->s_blocksize;
313	buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
314	buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
315	buf->f_bavail = buf->f_bfree;
316	buf->f_files = 0xFFFFFFFF;
317	buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
318	buf->f_fsid.val[0] = (u32)id;
319	buf->f_fsid.val[1] = (u32)(id >> 32);
320	buf->f_namelen = HFSPLUS_MAX_STRLEN;
321
322	return 0;
323}
324
325static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
326{
327	sync_filesystem(sb);
328	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
329		return 0;
330	if (!(*flags & MS_RDONLY)) {
331		struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
332		int force = 0;
333
334		if (!hfsplus_parse_options_remount(data, &force))
335			return -EINVAL;
336
337		if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
338			pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  leaving read-only.\n");
339			sb->s_flags |= MS_RDONLY;
340			*flags |= MS_RDONLY;
341		} else if (force) {
342			/* nothing */
343		} else if (vhdr->attributes &
344				cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
345			pr_warn("filesystem is marked locked, leaving read-only.\n");
346			sb->s_flags |= MS_RDONLY;
347			*flags |= MS_RDONLY;
348		} else if (vhdr->attributes &
349				cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
350			pr_warn("filesystem is marked journaled, leaving read-only.\n");
351			sb->s_flags |= MS_RDONLY;
352			*flags |= MS_RDONLY;
353		}
354	}
355	return 0;
356}
357
358static const struct super_operations hfsplus_sops = {
359	.alloc_inode	= hfsplus_alloc_inode,
360	.destroy_inode	= hfsplus_destroy_inode,
361	.write_inode	= hfsplus_write_inode,
362	.evict_inode	= hfsplus_evict_inode,
363	.put_super	= hfsplus_put_super,
364	.sync_fs	= hfsplus_sync_fs,
365	.statfs		= hfsplus_statfs,
366	.remount_fs	= hfsplus_remount,
367	.show_options	= hfsplus_show_options,
368};
369
370static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
371{
372	struct hfsplus_vh *vhdr;
373	struct hfsplus_sb_info *sbi;
374	hfsplus_cat_entry entry;
375	struct hfs_find_data fd;
376	struct inode *root, *inode;
377	struct qstr str;
378	struct nls_table *nls = NULL;
379	u64 last_fs_block, last_fs_page;
380	int err;
381
382	err = -ENOMEM;
383	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
384	if (!sbi)
385		goto out;
386
387	sb->s_fs_info = sbi;
388	mutex_init(&sbi->alloc_mutex);
389	mutex_init(&sbi->vh_mutex);
390	spin_lock_init(&sbi->work_lock);
391	INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
392	hfsplus_fill_defaults(sbi);
393
394	err = -EINVAL;
395	if (!hfsplus_parse_options(data, sbi)) {
396		pr_err("unable to parse mount options\n");
397		goto out_unload_nls;
398	}
399
400	/* temporarily use utf8 to correctly find the hidden dir below */
401	nls = sbi->nls;
402	sbi->nls = load_nls("utf8");
403	if (!sbi->nls) {
404		pr_err("unable to load nls for utf8\n");
405		goto out_unload_nls;
406	}
407
408	/* Grab the volume header */
409	if (hfsplus_read_wrapper(sb)) {
410		if (!silent)
411			pr_warn("unable to find HFS+ superblock\n");
412		goto out_unload_nls;
413	}
414	vhdr = sbi->s_vhdr;
415
416	/* Copy parts of the volume header into the superblock */
417	sb->s_magic = HFSPLUS_VOLHEAD_SIG;
418	if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
419	    be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
420		pr_err("wrong filesystem version\n");
421		goto out_free_vhdr;
422	}
423	sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
424	sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
425	sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
426	sbi->file_count = be32_to_cpu(vhdr->file_count);
427	sbi->folder_count = be32_to_cpu(vhdr->folder_count);
428	sbi->data_clump_blocks =
429		be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
430	if (!sbi->data_clump_blocks)
431		sbi->data_clump_blocks = 1;
432	sbi->rsrc_clump_blocks =
433		be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
434	if (!sbi->rsrc_clump_blocks)
435		sbi->rsrc_clump_blocks = 1;
436
437	err = -EFBIG;
438	last_fs_block = sbi->total_blocks - 1;
439	last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
440			PAGE_CACHE_SHIFT;
441
442	if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
443	    (last_fs_page > (pgoff_t)(~0ULL))) {
444		pr_err("filesystem size too large\n");
445		goto out_free_vhdr;
446	}
447
448	/* Set up operations so we can load metadata */
449	sb->s_op = &hfsplus_sops;
450	sb->s_maxbytes = MAX_LFS_FILESIZE;
451
452	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
453		pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  mounting read-only.\n");
454		sb->s_flags |= MS_RDONLY;
455	} else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
456		/* nothing */
457	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
458		pr_warn("Filesystem is marked locked, mounting read-only.\n");
459		sb->s_flags |= MS_RDONLY;
460	} else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
461			!(sb->s_flags & MS_RDONLY)) {
462		pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
463		sb->s_flags |= MS_RDONLY;
464	}
465
466	err = -EINVAL;
467
468	/* Load metadata objects (B*Trees) */
469	sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
470	if (!sbi->ext_tree) {
471		pr_err("failed to load extents file\n");
472		goto out_free_vhdr;
473	}
474	sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
475	if (!sbi->cat_tree) {
476		pr_err("failed to load catalog file\n");
477		goto out_close_ext_tree;
478	}
479	atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
480	if (vhdr->attr_file.total_blocks != 0) {
481		sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
482		if (!sbi->attr_tree) {
483			pr_err("failed to load attributes file\n");
484			goto out_close_cat_tree;
485		}
486		atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
487	}
488	sb->s_xattr = hfsplus_xattr_handlers;
489
490	inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
491	if (IS_ERR(inode)) {
492		pr_err("failed to load allocation file\n");
493		err = PTR_ERR(inode);
494		goto out_close_attr_tree;
495	}
496	sbi->alloc_file = inode;
497
498	/* Load the root directory */
499	root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
500	if (IS_ERR(root)) {
501		pr_err("failed to load root directory\n");
502		err = PTR_ERR(root);
503		goto out_put_alloc_file;
504	}
505
506	sb->s_d_op = &hfsplus_dentry_operations;
507	sb->s_root = d_make_root(root);
508	if (!sb->s_root) {
509		err = -ENOMEM;
510		goto out_put_alloc_file;
511	}
512
513	str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
514	str.name = HFSP_HIDDENDIR_NAME;
515	err = hfs_find_init(sbi->cat_tree, &fd);
516	if (err)
517		goto out_put_root;
518	err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
519	if (unlikely(err < 0))
520		goto out_put_root;
521	if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
522		hfs_find_exit(&fd);
523		if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
524			goto out_put_root;
525		inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
526		if (IS_ERR(inode)) {
527			err = PTR_ERR(inode);
528			goto out_put_root;
529		}
530		sbi->hidden_dir = inode;
531	} else
532		hfs_find_exit(&fd);
533
534	if (!(sb->s_flags & MS_RDONLY)) {
535		/*
536		 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
537		 * all three are registered with Apple for our use
538		 */
539		vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
540		vhdr->modify_date = hfsp_now2mt();
541		be32_add_cpu(&vhdr->write_count, 1);
542		vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
543		vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
544		hfsplus_sync_fs(sb, 1);
545
546		if (!sbi->hidden_dir) {
547			mutex_lock(&sbi->vh_mutex);
548			sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
549			if (!sbi->hidden_dir) {
550				mutex_unlock(&sbi->vh_mutex);
551				err = -ENOMEM;
552				goto out_put_root;
553			}
554			err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
555						 &str, sbi->hidden_dir);
556			if (err) {
557				mutex_unlock(&sbi->vh_mutex);
558				goto out_put_hidden_dir;
559			}
560
561			err = hfsplus_init_inode_security(sbi->hidden_dir,
562								root, &str);
563			if (err == -EOPNOTSUPP)
564				err = 0; /* Operation is not supported. */
565			else if (err) {
566				/*
567				 * Try to delete anyway without
568				 * error analysis.
569				 */
570				hfsplus_delete_cat(sbi->hidden_dir->i_ino,
571							root, &str);
572				mutex_unlock(&sbi->vh_mutex);
573				goto out_put_hidden_dir;
574			}
575
576			mutex_unlock(&sbi->vh_mutex);
577			hfsplus_mark_inode_dirty(sbi->hidden_dir,
578						 HFSPLUS_I_CAT_DIRTY);
579		}
580	}
581
582	unload_nls(sbi->nls);
583	sbi->nls = nls;
584	return 0;
585
586out_put_hidden_dir:
587	iput(sbi->hidden_dir);
588out_put_root:
589	dput(sb->s_root);
590	sb->s_root = NULL;
591out_put_alloc_file:
592	iput(sbi->alloc_file);
593out_close_attr_tree:
594	hfs_btree_close(sbi->attr_tree);
595out_close_cat_tree:
596	hfs_btree_close(sbi->cat_tree);
597out_close_ext_tree:
598	hfs_btree_close(sbi->ext_tree);
599out_free_vhdr:
600	kfree(sbi->s_vhdr_buf);
601	kfree(sbi->s_backup_vhdr_buf);
602out_unload_nls:
603	unload_nls(sbi->nls);
604	unload_nls(nls);
605	kfree(sbi);
606out:
607	return err;
608}
609
610MODULE_AUTHOR("Brad Boyer");
611MODULE_DESCRIPTION("Extended Macintosh Filesystem");
612MODULE_LICENSE("GPL");
613
614static struct kmem_cache *hfsplus_inode_cachep;
615
616static struct inode *hfsplus_alloc_inode(struct super_block *sb)
617{
618	struct hfsplus_inode_info *i;
619
620	i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
621	return i ? &i->vfs_inode : NULL;
622}
623
624static void hfsplus_i_callback(struct rcu_head *head)
625{
626	struct inode *inode = container_of(head, struct inode, i_rcu);
627
628	kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
629}
630
631static void hfsplus_destroy_inode(struct inode *inode)
632{
633	call_rcu(&inode->i_rcu, hfsplus_i_callback);
634}
635
636#define HFSPLUS_INODE_SIZE	sizeof(struct hfsplus_inode_info)
637
638static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
639			  int flags, const char *dev_name, void *data)
640{
641	return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
642}
643
644static struct file_system_type hfsplus_fs_type = {
645	.owner		= THIS_MODULE,
646	.name		= "hfsplus",
647	.mount		= hfsplus_mount,
648	.kill_sb	= kill_block_super,
649	.fs_flags	= FS_REQUIRES_DEV,
650};
651MODULE_ALIAS_FS("hfsplus");
652
653static void hfsplus_init_once(void *p)
654{
655	struct hfsplus_inode_info *i = p;
656
657	inode_init_once(&i->vfs_inode);
658}
659
660static int __init init_hfsplus_fs(void)
661{
662	int err;
663
664	hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
665		HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
666		hfsplus_init_once);
667	if (!hfsplus_inode_cachep)
668		return -ENOMEM;
669	err = hfsplus_create_attr_tree_cache();
670	if (err)
671		goto destroy_inode_cache;
672	err = register_filesystem(&hfsplus_fs_type);
673	if (err)
674		goto destroy_attr_tree_cache;
675	return 0;
676
677destroy_attr_tree_cache:
678	hfsplus_destroy_attr_tree_cache();
679
680destroy_inode_cache:
681	kmem_cache_destroy(hfsplus_inode_cachep);
682
683	return err;
684}
685
686static void __exit exit_hfsplus_fs(void)
687{
688	unregister_filesystem(&hfsplus_fs_type);
689
690	/*
691	 * Make sure all delayed rcu free inodes are flushed before we
692	 * destroy cache.
693	 */
694	rcu_barrier();
695	hfsplus_destroy_attr_tree_cache();
696	kmem_cache_destroy(hfsplus_inode_cachep);
697}
698
699module_init(init_hfsplus_fs)
700module_exit(exit_hfsplus_fs)
701