xref: /linux/fs/hfsplus/super.c (revision cb6bbff7e6fb263dd739514b3f5dfdcd8eaa9836)
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/fs_context.h>
18 #include <linux/slab.h>
19 #include <linux/vfs.h>
20 #include <linux/nls.h>
21 
22 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
23 static void hfsplus_free_inode(struct inode *inode);
24 
25 #include "hfsplus_fs.h"
26 #include "xattr.h"
27 
hfsplus_system_read_inode(struct inode * inode)28 static int hfsplus_system_read_inode(struct inode *inode)
29 {
30 	struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
31 
32 	switch (inode->i_ino) {
33 	case HFSPLUS_EXT_CNID:
34 		hfsplus_inode_read_fork(inode, &vhdr->ext_file);
35 		inode->i_mapping->a_ops = &hfsplus_btree_aops;
36 		break;
37 	case HFSPLUS_CAT_CNID:
38 		hfsplus_inode_read_fork(inode, &vhdr->cat_file);
39 		inode->i_mapping->a_ops = &hfsplus_btree_aops;
40 		break;
41 	case HFSPLUS_ALLOC_CNID:
42 		hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
43 		inode->i_mapping->a_ops = &hfsplus_aops;
44 		break;
45 	case HFSPLUS_START_CNID:
46 		hfsplus_inode_read_fork(inode, &vhdr->start_file);
47 		break;
48 	case HFSPLUS_ATTR_CNID:
49 		hfsplus_inode_read_fork(inode, &vhdr->attr_file);
50 		inode->i_mapping->a_ops = &hfsplus_btree_aops;
51 		break;
52 	default:
53 		return -EIO;
54 	}
55 
56 	return 0;
57 }
58 
hfsplus_iget(struct super_block * sb,unsigned long ino)59 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
60 {
61 	struct hfs_find_data fd;
62 	struct inode *inode;
63 	int err;
64 
65 	inode = iget_locked(sb, ino);
66 	if (!inode)
67 		return ERR_PTR(-ENOMEM);
68 	if (!(inode->i_state & I_NEW))
69 		return inode;
70 
71 	INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
72 	spin_lock_init(&HFSPLUS_I(inode)->open_dir_lock);
73 	mutex_init(&HFSPLUS_I(inode)->extents_lock);
74 	HFSPLUS_I(inode)->flags = 0;
75 	HFSPLUS_I(inode)->extent_state = 0;
76 	HFSPLUS_I(inode)->rsrc_inode = NULL;
77 	atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
78 
79 	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
80 	    inode->i_ino == HFSPLUS_ROOT_CNID) {
81 		err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
82 		if (!err) {
83 			err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
84 			if (!err)
85 				err = hfsplus_cat_read_inode(inode, &fd);
86 			hfs_find_exit(&fd);
87 		}
88 	} else {
89 		err = hfsplus_system_read_inode(inode);
90 	}
91 
92 	if (err) {
93 		iget_failed(inode);
94 		return ERR_PTR(err);
95 	}
96 
97 	unlock_new_inode(inode);
98 	return inode;
99 }
100 
hfsplus_system_write_inode(struct inode * inode)101 static int hfsplus_system_write_inode(struct inode *inode)
102 {
103 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
104 	struct hfsplus_vh *vhdr = sbi->s_vhdr;
105 	struct hfsplus_fork_raw *fork;
106 	struct hfs_btree *tree = NULL;
107 
108 	switch (inode->i_ino) {
109 	case HFSPLUS_EXT_CNID:
110 		fork = &vhdr->ext_file;
111 		tree = sbi->ext_tree;
112 		break;
113 	case HFSPLUS_CAT_CNID:
114 		fork = &vhdr->cat_file;
115 		tree = sbi->cat_tree;
116 		break;
117 	case HFSPLUS_ALLOC_CNID:
118 		fork = &vhdr->alloc_file;
119 		break;
120 	case HFSPLUS_START_CNID:
121 		fork = &vhdr->start_file;
122 		break;
123 	case HFSPLUS_ATTR_CNID:
124 		fork = &vhdr->attr_file;
125 		tree = sbi->attr_tree;
126 		break;
127 	default:
128 		return -EIO;
129 	}
130 
131 	if (fork->total_size != cpu_to_be64(inode->i_size)) {
132 		set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
133 		hfsplus_mark_mdb_dirty(inode->i_sb);
134 	}
135 	hfsplus_inode_write_fork(inode, fork);
136 	if (tree) {
137 		int err = hfs_btree_write(tree);
138 
139 		if (err) {
140 			pr_err("b-tree write err: %d, ino %lu\n",
141 			       err, inode->i_ino);
142 			return err;
143 		}
144 	}
145 	return 0;
146 }
147 
hfsplus_write_inode(struct inode * inode,struct writeback_control * wbc)148 static int hfsplus_write_inode(struct inode *inode,
149 		struct writeback_control *wbc)
150 {
151 	int err;
152 
153 	hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
154 
155 	err = hfsplus_ext_write_extent(inode);
156 	if (err)
157 		return err;
158 
159 	if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
160 	    inode->i_ino == HFSPLUS_ROOT_CNID)
161 		return hfsplus_cat_write_inode(inode);
162 	else
163 		return hfsplus_system_write_inode(inode);
164 }
165 
hfsplus_evict_inode(struct inode * inode)166 static void hfsplus_evict_inode(struct inode *inode)
167 {
168 	hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
169 	truncate_inode_pages_final(&inode->i_data);
170 	clear_inode(inode);
171 	if (HFSPLUS_IS_RSRC(inode)) {
172 		HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
173 		iput(HFSPLUS_I(inode)->rsrc_inode);
174 	}
175 }
176 
hfsplus_sync_fs(struct super_block * sb,int wait)177 static int hfsplus_sync_fs(struct super_block *sb, int wait)
178 {
179 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
180 	struct hfsplus_vh *vhdr = sbi->s_vhdr;
181 	int write_backup = 0;
182 	int error, error2;
183 
184 	if (!wait)
185 		return 0;
186 
187 	hfs_dbg(SUPER, "hfsplus_sync_fs\n");
188 
189 	/*
190 	 * Explicitly write out the special metadata inodes.
191 	 *
192 	 * While these special inodes are marked as hashed and written
193 	 * out peridocically by the flusher threads we redirty them
194 	 * during writeout of normal inodes, and thus the life lock
195 	 * prevents us from getting the latest state to disk.
196 	 */
197 	error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
198 	error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
199 	if (!error)
200 		error = error2;
201 	if (sbi->attr_tree) {
202 		error2 =
203 		    filemap_write_and_wait(sbi->attr_tree->inode->i_mapping);
204 		if (!error)
205 			error = error2;
206 	}
207 	error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
208 	if (!error)
209 		error = error2;
210 
211 	mutex_lock(&sbi->vh_mutex);
212 	mutex_lock(&sbi->alloc_mutex);
213 	vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
214 	vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
215 	vhdr->folder_count = cpu_to_be32(sbi->folder_count);
216 	vhdr->file_count = cpu_to_be32(sbi->file_count);
217 
218 	if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
219 		memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
220 		write_backup = 1;
221 	}
222 
223 	error2 = hfsplus_submit_bio(sb,
224 				   sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
225 				   sbi->s_vhdr_buf, NULL, REQ_OP_WRITE);
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 	if (!error)
235 		error2 = error;
236 out:
237 	mutex_unlock(&sbi->alloc_mutex);
238 	mutex_unlock(&sbi->vh_mutex);
239 
240 	if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
241 		blkdev_issue_flush(sb->s_bdev);
242 
243 	return error;
244 }
245 
delayed_sync_fs(struct work_struct * work)246 static void delayed_sync_fs(struct work_struct *work)
247 {
248 	int err;
249 	struct hfsplus_sb_info *sbi;
250 
251 	sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
252 
253 	spin_lock(&sbi->work_lock);
254 	sbi->work_queued = 0;
255 	spin_unlock(&sbi->work_lock);
256 
257 	err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
258 	if (err)
259 		pr_err("delayed sync fs err %d\n", err);
260 }
261 
hfsplus_mark_mdb_dirty(struct super_block * sb)262 void hfsplus_mark_mdb_dirty(struct super_block *sb)
263 {
264 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
265 	unsigned long delay;
266 
267 	if (sb_rdonly(sb))
268 		return;
269 
270 	spin_lock(&sbi->work_lock);
271 	if (!sbi->work_queued) {
272 		delay = msecs_to_jiffies(dirty_writeback_interval * 10);
273 		queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
274 		sbi->work_queued = 1;
275 	}
276 	spin_unlock(&sbi->work_lock);
277 }
278 
delayed_free(struct rcu_head * p)279 static void delayed_free(struct rcu_head *p)
280 {
281 	struct hfsplus_sb_info *sbi = container_of(p, struct hfsplus_sb_info, rcu);
282 
283 	unload_nls(sbi->nls);
284 	kfree(sbi);
285 }
286 
hfsplus_put_super(struct super_block * sb)287 static void hfsplus_put_super(struct super_block *sb)
288 {
289 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
290 
291 	hfs_dbg(SUPER, "hfsplus_put_super\n");
292 
293 	cancel_delayed_work_sync(&sbi->sync_work);
294 
295 	if (!sb_rdonly(sb) && sbi->s_vhdr) {
296 		struct hfsplus_vh *vhdr = sbi->s_vhdr;
297 
298 		vhdr->modify_date = hfsp_now2mt();
299 		vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
300 		vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
301 
302 		hfsplus_sync_fs(sb, 1);
303 	}
304 
305 	iput(sbi->alloc_file);
306 	iput(sbi->hidden_dir);
307 	hfs_btree_close(sbi->attr_tree);
308 	hfs_btree_close(sbi->cat_tree);
309 	hfs_btree_close(sbi->ext_tree);
310 	kfree(sbi->s_vhdr_buf);
311 	kfree(sbi->s_backup_vhdr_buf);
312 	call_rcu(&sbi->rcu, delayed_free);
313 }
314 
hfsplus_statfs(struct dentry * dentry,struct kstatfs * buf)315 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
316 {
317 	struct super_block *sb = dentry->d_sb;
318 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
319 	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
320 
321 	buf->f_type = HFSPLUS_SUPER_MAGIC;
322 	buf->f_bsize = sb->s_blocksize;
323 	buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
324 	buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
325 	buf->f_bavail = buf->f_bfree;
326 	buf->f_files = 0xFFFFFFFF;
327 	buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
328 	buf->f_fsid = u64_to_fsid(id);
329 	buf->f_namelen = HFSPLUS_MAX_STRLEN;
330 
331 	return 0;
332 }
333 
hfsplus_reconfigure(struct fs_context * fc)334 static int hfsplus_reconfigure(struct fs_context *fc)
335 {
336 	struct super_block *sb = fc->root->d_sb;
337 
338 	sync_filesystem(sb);
339 	if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb))
340 		return 0;
341 	if (!(fc->sb_flags & SB_RDONLY)) {
342 		struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
343 		struct hfsplus_vh *vhdr = sbi->s_vhdr;
344 
345 		if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
346 			pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  leaving read-only.\n");
347 			sb->s_flags |= SB_RDONLY;
348 			fc->sb_flags |= SB_RDONLY;
349 		} else if (test_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
350 			/* nothing */
351 		} else if (vhdr->attributes &
352 				cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
353 			pr_warn("filesystem is marked locked, leaving read-only.\n");
354 			sb->s_flags |= SB_RDONLY;
355 			fc->sb_flags |= SB_RDONLY;
356 		} else if (vhdr->attributes &
357 				cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
358 			pr_warn("filesystem is marked journaled, leaving read-only.\n");
359 			sb->s_flags |= SB_RDONLY;
360 			fc->sb_flags |= SB_RDONLY;
361 		}
362 	}
363 	return 0;
364 }
365 
366 static const struct super_operations hfsplus_sops = {
367 	.alloc_inode	= hfsplus_alloc_inode,
368 	.free_inode	= hfsplus_free_inode,
369 	.write_inode	= hfsplus_write_inode,
370 	.evict_inode	= hfsplus_evict_inode,
371 	.put_super	= hfsplus_put_super,
372 	.sync_fs	= hfsplus_sync_fs,
373 	.statfs		= hfsplus_statfs,
374 	.show_options	= hfsplus_show_options,
375 };
376 
hfsplus_fill_super(struct super_block * sb,struct fs_context * fc)377 static int hfsplus_fill_super(struct super_block *sb, struct fs_context *fc)
378 {
379 	struct hfsplus_vh *vhdr;
380 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
381 	hfsplus_cat_entry entry;
382 	struct hfs_find_data fd;
383 	struct inode *root, *inode;
384 	struct qstr str;
385 	struct nls_table *nls;
386 	u64 last_fs_block, last_fs_page;
387 	int silent = fc->sb_flags & SB_SILENT;
388 	int err;
389 
390 	mutex_init(&sbi->alloc_mutex);
391 	mutex_init(&sbi->vh_mutex);
392 	spin_lock_init(&sbi->work_lock);
393 	INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
394 
395 	err = -EINVAL;
396 	if (!sbi->nls) {
397 		/* try utf8 first, as this is the old default behaviour */
398 		sbi->nls = load_nls("utf8");
399 		if (!sbi->nls)
400 			sbi->nls = load_nls_default();
401 	}
402 
403 	/* temporarily use utf8 to correctly find the hidden dir below */
404 	nls = sbi->nls;
405 	sbi->nls = load_nls("utf8");
406 	if (!sbi->nls) {
407 		pr_err("unable to load nls for utf8\n");
408 		goto out_unload_nls;
409 	}
410 
411 	/* Grab the volume header */
412 	if (hfsplus_read_wrapper(sb)) {
413 		if (!silent)
414 			pr_warn("unable to find HFS+ superblock\n");
415 		goto out_unload_nls;
416 	}
417 	vhdr = sbi->s_vhdr;
418 
419 	/* Copy parts of the volume header into the superblock */
420 	sb->s_magic = HFSPLUS_VOLHEAD_SIG;
421 	if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
422 	    be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
423 		pr_err("wrong filesystem version\n");
424 		goto out_free_vhdr;
425 	}
426 	sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
427 	sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
428 	sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
429 	sbi->file_count = be32_to_cpu(vhdr->file_count);
430 	sbi->folder_count = be32_to_cpu(vhdr->folder_count);
431 	sbi->data_clump_blocks =
432 		be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
433 	if (!sbi->data_clump_blocks)
434 		sbi->data_clump_blocks = 1;
435 	sbi->rsrc_clump_blocks =
436 		be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
437 	if (!sbi->rsrc_clump_blocks)
438 		sbi->rsrc_clump_blocks = 1;
439 
440 	err = -EFBIG;
441 	last_fs_block = sbi->total_blocks - 1;
442 	last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
443 			PAGE_SHIFT;
444 
445 	if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
446 	    (last_fs_page > (pgoff_t)(~0ULL))) {
447 		pr_err("filesystem size too large\n");
448 		goto out_free_vhdr;
449 	}
450 
451 	/* Set up operations so we can load metadata */
452 	sb->s_op = &hfsplus_sops;
453 	sb->s_maxbytes = MAX_LFS_FILESIZE;
454 
455 	if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
456 		pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  mounting read-only.\n");
457 		sb->s_flags |= SB_RDONLY;
458 	} else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
459 		/* nothing */
460 	} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
461 		pr_warn("Filesystem is marked locked, mounting read-only.\n");
462 		sb->s_flags |= SB_RDONLY;
463 	} else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
464 			!sb_rdonly(sb)) {
465 		pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
466 		sb->s_flags |= SB_RDONLY;
467 	}
468 
469 	err = -EINVAL;
470 
471 	/* Load metadata objects (B*Trees) */
472 	sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
473 	if (!sbi->ext_tree) {
474 		pr_err("failed to load extents file\n");
475 		goto out_free_vhdr;
476 	}
477 	sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
478 	if (!sbi->cat_tree) {
479 		pr_err("failed to load catalog file\n");
480 		goto out_close_ext_tree;
481 	}
482 	atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
483 	if (vhdr->attr_file.total_blocks != 0) {
484 		sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
485 		if (!sbi->attr_tree) {
486 			pr_err("failed to load attributes file\n");
487 			goto out_close_cat_tree;
488 		}
489 		atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
490 	}
491 	sb->s_xattr = hfsplus_xattr_handlers;
492 
493 	inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
494 	if (IS_ERR(inode)) {
495 		pr_err("failed to load allocation file\n");
496 		err = PTR_ERR(inode);
497 		goto out_close_attr_tree;
498 	}
499 	sbi->alloc_file = inode;
500 
501 	/* Load the root directory */
502 	root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
503 	if (IS_ERR(root)) {
504 		pr_err("failed to load root directory\n");
505 		err = PTR_ERR(root);
506 		goto out_put_alloc_file;
507 	}
508 
509 	set_default_d_op(sb, &hfsplus_dentry_operations);
510 	sb->s_root = d_make_root(root);
511 	if (!sb->s_root) {
512 		err = -ENOMEM;
513 		goto out_put_alloc_file;
514 	}
515 
516 	str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
517 	str.name = HFSP_HIDDENDIR_NAME;
518 	err = hfs_find_init(sbi->cat_tree, &fd);
519 	if (err)
520 		goto out_put_root;
521 	err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
522 	if (unlikely(err < 0))
523 		goto out_put_root;
524 	if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
525 		hfs_find_exit(&fd);
526 		if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) {
527 			err = -EINVAL;
528 			goto out_put_root;
529 		}
530 		inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
531 		if (IS_ERR(inode)) {
532 			err = PTR_ERR(inode);
533 			goto out_put_root;
534 		}
535 		sbi->hidden_dir = inode;
536 	} else
537 		hfs_find_exit(&fd);
538 
539 	if (!sb_rdonly(sb)) {
540 		/*
541 		 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
542 		 * all three are registered with Apple for our use
543 		 */
544 		vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
545 		vhdr->modify_date = hfsp_now2mt();
546 		be32_add_cpu(&vhdr->write_count, 1);
547 		vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
548 		vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
549 		hfsplus_sync_fs(sb, 1);
550 
551 		if (!sbi->hidden_dir) {
552 			mutex_lock(&sbi->vh_mutex);
553 			sbi->hidden_dir = hfsplus_new_inode(sb, root, S_IFDIR);
554 			if (!sbi->hidden_dir) {
555 				mutex_unlock(&sbi->vh_mutex);
556 				err = -ENOMEM;
557 				goto out_put_root;
558 			}
559 			err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
560 						 &str, sbi->hidden_dir);
561 			if (err) {
562 				mutex_unlock(&sbi->vh_mutex);
563 				goto out_put_hidden_dir;
564 			}
565 
566 			err = hfsplus_init_security(sbi->hidden_dir,
567 							root, &str);
568 			if (err == -EOPNOTSUPP)
569 				err = 0; /* Operation is not supported. */
570 			else if (err) {
571 				/*
572 				 * Try to delete anyway without
573 				 * error analysis.
574 				 */
575 				hfsplus_delete_cat(sbi->hidden_dir->i_ino,
576 							root, &str);
577 				mutex_unlock(&sbi->vh_mutex);
578 				goto out_put_hidden_dir;
579 			}
580 
581 			mutex_unlock(&sbi->vh_mutex);
582 			hfsplus_mark_inode_dirty(sbi->hidden_dir,
583 						 HFSPLUS_I_CAT_DIRTY);
584 		}
585 	}
586 
587 	unload_nls(sbi->nls);
588 	sbi->nls = nls;
589 	return 0;
590 
591 out_put_hidden_dir:
592 	cancel_delayed_work_sync(&sbi->sync_work);
593 	iput(sbi->hidden_dir);
594 out_put_root:
595 	dput(sb->s_root);
596 	sb->s_root = NULL;
597 out_put_alloc_file:
598 	iput(sbi->alloc_file);
599 out_close_attr_tree:
600 	hfs_btree_close(sbi->attr_tree);
601 out_close_cat_tree:
602 	hfs_btree_close(sbi->cat_tree);
603 out_close_ext_tree:
604 	hfs_btree_close(sbi->ext_tree);
605 out_free_vhdr:
606 	kfree(sbi->s_vhdr_buf);
607 	kfree(sbi->s_backup_vhdr_buf);
608 out_unload_nls:
609 	unload_nls(sbi->nls);
610 	unload_nls(nls);
611 	kfree(sbi);
612 	return err;
613 }
614 
615 MODULE_AUTHOR("Brad Boyer");
616 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
617 MODULE_LICENSE("GPL");
618 
619 static struct kmem_cache *hfsplus_inode_cachep;
620 
hfsplus_alloc_inode(struct super_block * sb)621 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
622 {
623 	struct hfsplus_inode_info *i;
624 
625 	i = alloc_inode_sb(sb, hfsplus_inode_cachep, GFP_KERNEL);
626 	return i ? &i->vfs_inode : NULL;
627 }
628 
hfsplus_free_inode(struct inode * inode)629 static void hfsplus_free_inode(struct inode *inode)
630 {
631 	kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
632 }
633 
634 #define HFSPLUS_INODE_SIZE	sizeof(struct hfsplus_inode_info)
635 
hfsplus_get_tree(struct fs_context * fc)636 static int hfsplus_get_tree(struct fs_context *fc)
637 {
638 	return get_tree_bdev(fc, hfsplus_fill_super);
639 }
640 
hfsplus_free_fc(struct fs_context * fc)641 static void hfsplus_free_fc(struct fs_context *fc)
642 {
643 	kfree(fc->s_fs_info);
644 }
645 
646 static const struct fs_context_operations hfsplus_context_ops = {
647 	.parse_param	= hfsplus_parse_param,
648 	.get_tree	= hfsplus_get_tree,
649 	.reconfigure	= hfsplus_reconfigure,
650 	.free		= hfsplus_free_fc,
651 };
652 
hfsplus_init_fs_context(struct fs_context * fc)653 static int hfsplus_init_fs_context(struct fs_context *fc)
654 {
655 	struct hfsplus_sb_info *sbi;
656 
657 	sbi = kzalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
658 	if (!sbi)
659 		return -ENOMEM;
660 
661 	if (fc->purpose != FS_CONTEXT_FOR_RECONFIGURE)
662 		hfsplus_fill_defaults(sbi);
663 
664 	fc->s_fs_info = sbi;
665 	fc->ops = &hfsplus_context_ops;
666 
667 	return 0;
668 }
669 
670 static struct file_system_type hfsplus_fs_type = {
671 	.owner		= THIS_MODULE,
672 	.name		= "hfsplus",
673 	.kill_sb	= kill_block_super,
674 	.fs_flags	= FS_REQUIRES_DEV,
675 	.init_fs_context = hfsplus_init_fs_context,
676 };
677 MODULE_ALIAS_FS("hfsplus");
678 
hfsplus_init_once(void * p)679 static void hfsplus_init_once(void *p)
680 {
681 	struct hfsplus_inode_info *i = p;
682 
683 	inode_init_once(&i->vfs_inode);
684 }
685 
init_hfsplus_fs(void)686 static int __init init_hfsplus_fs(void)
687 {
688 	int err;
689 
690 	hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
691 		HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
692 		hfsplus_init_once);
693 	if (!hfsplus_inode_cachep)
694 		return -ENOMEM;
695 	err = hfsplus_create_attr_tree_cache();
696 	if (err)
697 		goto destroy_inode_cache;
698 	err = register_filesystem(&hfsplus_fs_type);
699 	if (err)
700 		goto destroy_attr_tree_cache;
701 	return 0;
702 
703 destroy_attr_tree_cache:
704 	hfsplus_destroy_attr_tree_cache();
705 
706 destroy_inode_cache:
707 	kmem_cache_destroy(hfsplus_inode_cachep);
708 
709 	return err;
710 }
711 
exit_hfsplus_fs(void)712 static void __exit exit_hfsplus_fs(void)
713 {
714 	unregister_filesystem(&hfsplus_fs_type);
715 
716 	/*
717 	 * Make sure all delayed rcu free inodes are flushed before we
718 	 * destroy cache.
719 	 */
720 	rcu_barrier();
721 	hfsplus_destroy_attr_tree_cache();
722 	kmem_cache_destroy(hfsplus_inode_cachep);
723 }
724 
725 module_init(init_hfsplus_fs)
726 module_exit(exit_hfsplus_fs)
727