xref: /linux/fs/hfsplus/super.c (revision 79790b6818e96c58fe2bffee1b418c16e64e7b80)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  linux/fs/hfsplus/super.c
4  *
5  * Copyright (C) 2001
6  * Brad Boyer (flar@allandria.com)
7  * (C) 2003 Ardis Technologies <roman@ardistech.com>
8  *
9  */
10 
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/pagemap.h>
14 #include <linux/blkdev.h>
15 #include <linux/backing-dev.h>
16 #include <linux/fs.h>
17 #include <linux/slab.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_free_inode(struct inode *inode);
23 
24 #include "hfsplus_fs.h"
25 #include "xattr.h"
26 
hfsplus_system_read_inode(struct inode * inode)27 static int hfsplus_system_read_inode(struct inode *inode)
28 {
29 	struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
30 
31 	switch (inode->i_ino) {
32 	case HFSPLUS_EXT_CNID:
33 		hfsplus_inode_read_fork(inode, &vhdr->ext_file);
34 		inode->i_mapping->a_ops = &hfsplus_btree_aops;
35 		break;
36 	case HFSPLUS_CAT_CNID:
37 		hfsplus_inode_read_fork(inode, &vhdr->cat_file);
38 		inode->i_mapping->a_ops = &hfsplus_btree_aops;
39 		break;
40 	case HFSPLUS_ALLOC_CNID:
41 		hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
42 		inode->i_mapping->a_ops = &hfsplus_aops;
43 		break;
44 	case HFSPLUS_START_CNID:
45 		hfsplus_inode_read_fork(inode, &vhdr->start_file);
46 		break;
47 	case HFSPLUS_ATTR_CNID:
48 		hfsplus_inode_read_fork(inode, &vhdr->attr_file);
49 		inode->i_mapping->a_ops = &hfsplus_btree_aops;
50 		break;
51 	default:
52 		return -EIO;
53 	}
54 
55 	return 0;
56 }
57 
hfsplus_iget(struct super_block * sb,unsigned long ino)58 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
59 {
60 	struct hfs_find_data fd;
61 	struct inode *inode;
62 	int err;
63 
64 	inode = iget_locked(sb, ino);
65 	if (!inode)
66 		return ERR_PTR(-ENOMEM);
67 	if (!(inode->i_state & I_NEW))
68 		return inode;
69 
70 	INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
71 	spin_lock_init(&HFSPLUS_I(inode)->open_dir_lock);
72 	mutex_init(&HFSPLUS_I(inode)->extents_lock);
73 	HFSPLUS_I(inode)->flags = 0;
74 	HFSPLUS_I(inode)->extent_state = 0;
75 	HFSPLUS_I(inode)->rsrc_inode = NULL;
76 	atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
77 
78 	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
79 	    inode->i_ino == HFSPLUS_ROOT_CNID) {
80 		err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
81 		if (!err) {
82 			err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
83 			if (!err)
84 				err = hfsplus_cat_read_inode(inode, &fd);
85 			hfs_find_exit(&fd);
86 		}
87 	} else {
88 		err = hfsplus_system_read_inode(inode);
89 	}
90 
91 	if (err) {
92 		iget_failed(inode);
93 		return ERR_PTR(err);
94 	}
95 
96 	unlock_new_inode(inode);
97 	return inode;
98 }
99 
hfsplus_system_write_inode(struct inode * inode)100 static int hfsplus_system_write_inode(struct inode *inode)
101 {
102 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
103 	struct hfsplus_vh *vhdr = sbi->s_vhdr;
104 	struct hfsplus_fork_raw *fork;
105 	struct hfs_btree *tree = NULL;
106 
107 	switch (inode->i_ino) {
108 	case HFSPLUS_EXT_CNID:
109 		fork = &vhdr->ext_file;
110 		tree = sbi->ext_tree;
111 		break;
112 	case HFSPLUS_CAT_CNID:
113 		fork = &vhdr->cat_file;
114 		tree = sbi->cat_tree;
115 		break;
116 	case HFSPLUS_ALLOC_CNID:
117 		fork = &vhdr->alloc_file;
118 		break;
119 	case HFSPLUS_START_CNID:
120 		fork = &vhdr->start_file;
121 		break;
122 	case HFSPLUS_ATTR_CNID:
123 		fork = &vhdr->attr_file;
124 		tree = sbi->attr_tree;
125 		break;
126 	default:
127 		return -EIO;
128 	}
129 
130 	if (fork->total_size != cpu_to_be64(inode->i_size)) {
131 		set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
132 		hfsplus_mark_mdb_dirty(inode->i_sb);
133 	}
134 	hfsplus_inode_write_fork(inode, fork);
135 	if (tree) {
136 		int err = hfs_btree_write(tree);
137 
138 		if (err) {
139 			pr_err("b-tree write err: %d, ino %lu\n",
140 			       err, inode->i_ino);
141 			return err;
142 		}
143 	}
144 	return 0;
145 }
146 
hfsplus_write_inode(struct inode * inode,struct writeback_control * wbc)147 static int hfsplus_write_inode(struct inode *inode,
148 		struct writeback_control *wbc)
149 {
150 	int err;
151 
152 	hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
153 
154 	err = hfsplus_ext_write_extent(inode);
155 	if (err)
156 		return err;
157 
158 	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
159 	    inode->i_ino == HFSPLUS_ROOT_CNID)
160 		return hfsplus_cat_write_inode(inode);
161 	else
162 		return hfsplus_system_write_inode(inode);
163 }
164 
hfsplus_evict_inode(struct inode * inode)165 static void hfsplus_evict_inode(struct inode *inode)
166 {
167 	hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
168 	truncate_inode_pages_final(&inode->i_data);
169 	clear_inode(inode);
170 	if (HFSPLUS_IS_RSRC(inode)) {
171 		HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
172 		iput(HFSPLUS_I(inode)->rsrc_inode);
173 	}
174 }
175 
hfsplus_sync_fs(struct super_block * sb,int wait)176 static int hfsplus_sync_fs(struct super_block *sb, int wait)
177 {
178 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
179 	struct hfsplus_vh *vhdr = sbi->s_vhdr;
180 	int write_backup = 0;
181 	int error, error2;
182 
183 	if (!wait)
184 		return 0;
185 
186 	hfs_dbg(SUPER, "hfsplus_sync_fs\n");
187 
188 	/*
189 	 * Explicitly write out the special metadata inodes.
190 	 *
191 	 * While these special inodes are marked as hashed and written
192 	 * out peridocically by the flusher threads we redirty them
193 	 * during writeout of normal inodes, and thus the life lock
194 	 * prevents us from getting the latest state to disk.
195 	 */
196 	error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
197 	error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
198 	if (!error)
199 		error = error2;
200 	if (sbi->attr_tree) {
201 		error2 =
202 		    filemap_write_and_wait(sbi->attr_tree->inode->i_mapping);
203 		if (!error)
204 			error = error2;
205 	}
206 	error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
207 	if (!error)
208 		error = error2;
209 
210 	mutex_lock(&sbi->vh_mutex);
211 	mutex_lock(&sbi->alloc_mutex);
212 	vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
213 	vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
214 	vhdr->folder_count = cpu_to_be32(sbi->folder_count);
215 	vhdr->file_count = cpu_to_be32(sbi->file_count);
216 
217 	if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
218 		memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
219 		write_backup = 1;
220 	}
221 
222 	error2 = hfsplus_submit_bio(sb,
223 				   sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
224 				   sbi->s_vhdr_buf, NULL, REQ_OP_WRITE |
225 				   REQ_SYNC);
226 	if (!error)
227 		error = error2;
228 	if (!write_backup)
229 		goto out;
230 
231 	error2 = hfsplus_submit_bio(sb,
232 				  sbi->part_start + sbi->sect_count - 2,
233 				  sbi->s_backup_vhdr_buf, NULL, REQ_OP_WRITE |
234 				  REQ_SYNC);
235 	if (!error)
236 		error2 = error;
237 out:
238 	mutex_unlock(&sbi->alloc_mutex);
239 	mutex_unlock(&sbi->vh_mutex);
240 
241 	if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
242 		blkdev_issue_flush(sb->s_bdev);
243 
244 	return error;
245 }
246 
delayed_sync_fs(struct work_struct * work)247 static void delayed_sync_fs(struct work_struct *work)
248 {
249 	int err;
250 	struct hfsplus_sb_info *sbi;
251 
252 	sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
253 
254 	spin_lock(&sbi->work_lock);
255 	sbi->work_queued = 0;
256 	spin_unlock(&sbi->work_lock);
257 
258 	err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
259 	if (err)
260 		pr_err("delayed sync fs err %d\n", err);
261 }
262 
hfsplus_mark_mdb_dirty(struct super_block * sb)263 void hfsplus_mark_mdb_dirty(struct super_block *sb)
264 {
265 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
266 	unsigned long delay;
267 
268 	if (sb_rdonly(sb))
269 		return;
270 
271 	spin_lock(&sbi->work_lock);
272 	if (!sbi->work_queued) {
273 		delay = msecs_to_jiffies(dirty_writeback_interval * 10);
274 		queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
275 		sbi->work_queued = 1;
276 	}
277 	spin_unlock(&sbi->work_lock);
278 }
279 
delayed_free(struct rcu_head * p)280 static void delayed_free(struct rcu_head *p)
281 {
282 	struct hfsplus_sb_info *sbi = container_of(p, struct hfsplus_sb_info, rcu);
283 
284 	unload_nls(sbi->nls);
285 	kfree(sbi);
286 }
287 
hfsplus_put_super(struct super_block * sb)288 static void hfsplus_put_super(struct super_block *sb)
289 {
290 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
291 
292 	hfs_dbg(SUPER, "hfsplus_put_super\n");
293 
294 	cancel_delayed_work_sync(&sbi->sync_work);
295 
296 	if (!sb_rdonly(sb) && sbi->s_vhdr) {
297 		struct hfsplus_vh *vhdr = sbi->s_vhdr;
298 
299 		vhdr->modify_date = hfsp_now2mt();
300 		vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
301 		vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
302 
303 		hfsplus_sync_fs(sb, 1);
304 	}
305 
306 	iput(sbi->alloc_file);
307 	iput(sbi->hidden_dir);
308 	hfs_btree_close(sbi->attr_tree);
309 	hfs_btree_close(sbi->cat_tree);
310 	hfs_btree_close(sbi->ext_tree);
311 	kfree(sbi->s_vhdr_buf);
312 	kfree(sbi->s_backup_vhdr_buf);
313 	call_rcu(&sbi->rcu, delayed_free);
314 }
315 
hfsplus_statfs(struct dentry * dentry,struct kstatfs * buf)316 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
317 {
318 	struct super_block *sb = dentry->d_sb;
319 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
320 	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
321 
322 	buf->f_type = HFSPLUS_SUPER_MAGIC;
323 	buf->f_bsize = sb->s_blocksize;
324 	buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
325 	buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
326 	buf->f_bavail = buf->f_bfree;
327 	buf->f_files = 0xFFFFFFFF;
328 	buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
329 	buf->f_fsid = u64_to_fsid(id);
330 	buf->f_namelen = HFSPLUS_MAX_STRLEN;
331 
332 	return 0;
333 }
334 
hfsplus_remount(struct super_block * sb,int * flags,char * data)335 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
336 {
337 	sync_filesystem(sb);
338 	if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
339 		return 0;
340 	if (!(*flags & SB_RDONLY)) {
341 		struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
342 		int force = 0;
343 
344 		if (!hfsplus_parse_options_remount(data, &force))
345 			return -EINVAL;
346 
347 		if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
348 			pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  leaving read-only.\n");
349 			sb->s_flags |= SB_RDONLY;
350 			*flags |= SB_RDONLY;
351 		} else if (force) {
352 			/* nothing */
353 		} else if (vhdr->attributes &
354 				cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
355 			pr_warn("filesystem is marked locked, leaving read-only.\n");
356 			sb->s_flags |= SB_RDONLY;
357 			*flags |= SB_RDONLY;
358 		} else if (vhdr->attributes &
359 				cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
360 			pr_warn("filesystem is marked journaled, leaving read-only.\n");
361 			sb->s_flags |= SB_RDONLY;
362 			*flags |= SB_RDONLY;
363 		}
364 	}
365 	return 0;
366 }
367 
368 static const struct super_operations hfsplus_sops = {
369 	.alloc_inode	= hfsplus_alloc_inode,
370 	.free_inode	= hfsplus_free_inode,
371 	.write_inode	= hfsplus_write_inode,
372 	.evict_inode	= hfsplus_evict_inode,
373 	.put_super	= hfsplus_put_super,
374 	.sync_fs	= hfsplus_sync_fs,
375 	.statfs		= hfsplus_statfs,
376 	.remount_fs	= hfsplus_remount,
377 	.show_options	= hfsplus_show_options,
378 };
379 
hfsplus_fill_super(struct super_block * sb,void * data,int silent)380 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
381 {
382 	struct hfsplus_vh *vhdr;
383 	struct hfsplus_sb_info *sbi;
384 	hfsplus_cat_entry entry;
385 	struct hfs_find_data fd;
386 	struct inode *root, *inode;
387 	struct qstr str;
388 	struct nls_table *nls = NULL;
389 	u64 last_fs_block, last_fs_page;
390 	int err;
391 
392 	err = -ENOMEM;
393 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
394 	if (!sbi)
395 		goto out;
396 
397 	sb->s_fs_info = sbi;
398 	mutex_init(&sbi->alloc_mutex);
399 	mutex_init(&sbi->vh_mutex);
400 	spin_lock_init(&sbi->work_lock);
401 	INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
402 	hfsplus_fill_defaults(sbi);
403 
404 	err = -EINVAL;
405 	if (!hfsplus_parse_options(data, sbi)) {
406 		pr_err("unable to parse mount options\n");
407 		goto out_unload_nls;
408 	}
409 
410 	/* temporarily use utf8 to correctly find the hidden dir below */
411 	nls = sbi->nls;
412 	sbi->nls = load_nls("utf8");
413 	if (!sbi->nls) {
414 		pr_err("unable to load nls for utf8\n");
415 		goto out_unload_nls;
416 	}
417 
418 	/* Grab the volume header */
419 	if (hfsplus_read_wrapper(sb)) {
420 		if (!silent)
421 			pr_warn("unable to find HFS+ superblock\n");
422 		goto out_unload_nls;
423 	}
424 	vhdr = sbi->s_vhdr;
425 
426 	/* Copy parts of the volume header into the superblock */
427 	sb->s_magic = HFSPLUS_VOLHEAD_SIG;
428 	if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
429 	    be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
430 		pr_err("wrong filesystem version\n");
431 		goto out_free_vhdr;
432 	}
433 	sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
434 	sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
435 	sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
436 	sbi->file_count = be32_to_cpu(vhdr->file_count);
437 	sbi->folder_count = be32_to_cpu(vhdr->folder_count);
438 	sbi->data_clump_blocks =
439 		be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
440 	if (!sbi->data_clump_blocks)
441 		sbi->data_clump_blocks = 1;
442 	sbi->rsrc_clump_blocks =
443 		be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
444 	if (!sbi->rsrc_clump_blocks)
445 		sbi->rsrc_clump_blocks = 1;
446 
447 	err = -EFBIG;
448 	last_fs_block = sbi->total_blocks - 1;
449 	last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
450 			PAGE_SHIFT;
451 
452 	if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
453 	    (last_fs_page > (pgoff_t)(~0ULL))) {
454 		pr_err("filesystem size too large\n");
455 		goto out_free_vhdr;
456 	}
457 
458 	/* Set up operations so we can load metadata */
459 	sb->s_op = &hfsplus_sops;
460 	sb->s_maxbytes = MAX_LFS_FILESIZE;
461 
462 	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
463 		pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  mounting read-only.\n");
464 		sb->s_flags |= SB_RDONLY;
465 	} else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
466 		/* nothing */
467 	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
468 		pr_warn("Filesystem is marked locked, mounting read-only.\n");
469 		sb->s_flags |= SB_RDONLY;
470 	} else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
471 			!sb_rdonly(sb)) {
472 		pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
473 		sb->s_flags |= SB_RDONLY;
474 	}
475 
476 	err = -EINVAL;
477 
478 	/* Load metadata objects (B*Trees) */
479 	sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
480 	if (!sbi->ext_tree) {
481 		pr_err("failed to load extents file\n");
482 		goto out_free_vhdr;
483 	}
484 	sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
485 	if (!sbi->cat_tree) {
486 		pr_err("failed to load catalog file\n");
487 		goto out_close_ext_tree;
488 	}
489 	atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
490 	if (vhdr->attr_file.total_blocks != 0) {
491 		sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
492 		if (!sbi->attr_tree) {
493 			pr_err("failed to load attributes file\n");
494 			goto out_close_cat_tree;
495 		}
496 		atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
497 	}
498 	sb->s_xattr = hfsplus_xattr_handlers;
499 
500 	inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
501 	if (IS_ERR(inode)) {
502 		pr_err("failed to load allocation file\n");
503 		err = PTR_ERR(inode);
504 		goto out_close_attr_tree;
505 	}
506 	sbi->alloc_file = inode;
507 
508 	/* Load the root directory */
509 	root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
510 	if (IS_ERR(root)) {
511 		pr_err("failed to load root directory\n");
512 		err = PTR_ERR(root);
513 		goto out_put_alloc_file;
514 	}
515 
516 	sb->s_d_op = &hfsplus_dentry_operations;
517 	sb->s_root = d_make_root(root);
518 	if (!sb->s_root) {
519 		err = -ENOMEM;
520 		goto out_put_alloc_file;
521 	}
522 
523 	str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
524 	str.name = HFSP_HIDDENDIR_NAME;
525 	err = hfs_find_init(sbi->cat_tree, &fd);
526 	if (err)
527 		goto out_put_root;
528 	err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
529 	if (unlikely(err < 0))
530 		goto out_put_root;
531 	if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
532 		hfs_find_exit(&fd);
533 		if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) {
534 			err = -EINVAL;
535 			goto out_put_root;
536 		}
537 		inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
538 		if (IS_ERR(inode)) {
539 			err = PTR_ERR(inode);
540 			goto out_put_root;
541 		}
542 		sbi->hidden_dir = inode;
543 	} else
544 		hfs_find_exit(&fd);
545 
546 	if (!sb_rdonly(sb)) {
547 		/*
548 		 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
549 		 * all three are registered with Apple for our use
550 		 */
551 		vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
552 		vhdr->modify_date = hfsp_now2mt();
553 		be32_add_cpu(&vhdr->write_count, 1);
554 		vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
555 		vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
556 		hfsplus_sync_fs(sb, 1);
557 
558 		if (!sbi->hidden_dir) {
559 			mutex_lock(&sbi->vh_mutex);
560 			sbi->hidden_dir = hfsplus_new_inode(sb, root, S_IFDIR);
561 			if (!sbi->hidden_dir) {
562 				mutex_unlock(&sbi->vh_mutex);
563 				err = -ENOMEM;
564 				goto out_put_root;
565 			}
566 			err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
567 						 &str, sbi->hidden_dir);
568 			if (err) {
569 				mutex_unlock(&sbi->vh_mutex);
570 				goto out_put_hidden_dir;
571 			}
572 
573 			err = hfsplus_init_security(sbi->hidden_dir,
574 							root, &str);
575 			if (err == -EOPNOTSUPP)
576 				err = 0; /* Operation is not supported. */
577 			else if (err) {
578 				/*
579 				 * Try to delete anyway without
580 				 * error analysis.
581 				 */
582 				hfsplus_delete_cat(sbi->hidden_dir->i_ino,
583 							root, &str);
584 				mutex_unlock(&sbi->vh_mutex);
585 				goto out_put_hidden_dir;
586 			}
587 
588 			mutex_unlock(&sbi->vh_mutex);
589 			hfsplus_mark_inode_dirty(sbi->hidden_dir,
590 						 HFSPLUS_I_CAT_DIRTY);
591 		}
592 	}
593 
594 	unload_nls(sbi->nls);
595 	sbi->nls = nls;
596 	return 0;
597 
598 out_put_hidden_dir:
599 	cancel_delayed_work_sync(&sbi->sync_work);
600 	iput(sbi->hidden_dir);
601 out_put_root:
602 	dput(sb->s_root);
603 	sb->s_root = NULL;
604 out_put_alloc_file:
605 	iput(sbi->alloc_file);
606 out_close_attr_tree:
607 	hfs_btree_close(sbi->attr_tree);
608 out_close_cat_tree:
609 	hfs_btree_close(sbi->cat_tree);
610 out_close_ext_tree:
611 	hfs_btree_close(sbi->ext_tree);
612 out_free_vhdr:
613 	kfree(sbi->s_vhdr_buf);
614 	kfree(sbi->s_backup_vhdr_buf);
615 out_unload_nls:
616 	unload_nls(sbi->nls);
617 	unload_nls(nls);
618 	kfree(sbi);
619 out:
620 	return err;
621 }
622 
623 MODULE_AUTHOR("Brad Boyer");
624 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
625 MODULE_LICENSE("GPL");
626 
627 static struct kmem_cache *hfsplus_inode_cachep;
628 
hfsplus_alloc_inode(struct super_block * sb)629 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
630 {
631 	struct hfsplus_inode_info *i;
632 
633 	i = alloc_inode_sb(sb, hfsplus_inode_cachep, GFP_KERNEL);
634 	return i ? &i->vfs_inode : NULL;
635 }
636 
hfsplus_free_inode(struct inode * inode)637 static void hfsplus_free_inode(struct inode *inode)
638 {
639 	kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
640 }
641 
642 #define HFSPLUS_INODE_SIZE	sizeof(struct hfsplus_inode_info)
643 
hfsplus_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)644 static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
645 			  int flags, const char *dev_name, void *data)
646 {
647 	return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
648 }
649 
650 static struct file_system_type hfsplus_fs_type = {
651 	.owner		= THIS_MODULE,
652 	.name		= "hfsplus",
653 	.mount		= hfsplus_mount,
654 	.kill_sb	= kill_block_super,
655 	.fs_flags	= FS_REQUIRES_DEV,
656 };
657 MODULE_ALIAS_FS("hfsplus");
658 
hfsplus_init_once(void * p)659 static void hfsplus_init_once(void *p)
660 {
661 	struct hfsplus_inode_info *i = p;
662 
663 	inode_init_once(&i->vfs_inode);
664 }
665 
init_hfsplus_fs(void)666 static int __init init_hfsplus_fs(void)
667 {
668 	int err;
669 
670 	hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
671 		HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
672 		hfsplus_init_once);
673 	if (!hfsplus_inode_cachep)
674 		return -ENOMEM;
675 	err = hfsplus_create_attr_tree_cache();
676 	if (err)
677 		goto destroy_inode_cache;
678 	err = register_filesystem(&hfsplus_fs_type);
679 	if (err)
680 		goto destroy_attr_tree_cache;
681 	return 0;
682 
683 destroy_attr_tree_cache:
684 	hfsplus_destroy_attr_tree_cache();
685 
686 destroy_inode_cache:
687 	kmem_cache_destroy(hfsplus_inode_cachep);
688 
689 	return err;
690 }
691 
exit_hfsplus_fs(void)692 static void __exit exit_hfsplus_fs(void)
693 {
694 	unregister_filesystem(&hfsplus_fs_type);
695 
696 	/*
697 	 * Make sure all delayed rcu free inodes are flushed before we
698 	 * destroy cache.
699 	 */
700 	rcu_barrier();
701 	hfsplus_destroy_attr_tree_cache();
702 	kmem_cache_destroy(hfsplus_inode_cachep);
703 }
704 
705 module_init(init_hfsplus_fs)
706 module_exit(exit_hfsplus_fs)
707