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