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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
21static struct inode *hfsplus_alloc_inode(struct super_block *sb);
22static void hfsplus_free_inode(struct inode *inode);
23
24#include "hfsplus_fs.h"
25#include "xattr.h"
26
27static 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
58struct 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
100static 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
147static 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
165static 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
176static 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;
237out:
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, GFP_KERNEL);
243
244 return error;
245}
246
247static 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
263void 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
280static void hfsplus_put_super(struct super_block *sb)
281{
282 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
283
284 hfs_dbg(SUPER, "hfsplus_put_super\n");
285
286 cancel_delayed_work_sync(&sbi->sync_work);
287
288 if (!sb_rdonly(sb) && sbi->s_vhdr) {
289 struct hfsplus_vh *vhdr = sbi->s_vhdr;
290
291 vhdr->modify_date = hfsp_now2mt();
292 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
293 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
294
295 hfsplus_sync_fs(sb, 1);
296 }
297
298 hfs_btree_close(sbi->attr_tree);
299 hfs_btree_close(sbi->cat_tree);
300 hfs_btree_close(sbi->ext_tree);
301 iput(sbi->alloc_file);
302 iput(sbi->hidden_dir);
303 kfree(sbi->s_vhdr_buf);
304 kfree(sbi->s_backup_vhdr_buf);
305 unload_nls(sbi->nls);
306 kfree(sb->s_fs_info);
307 sb->s_fs_info = NULL;
308}
309
310static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
311{
312 struct super_block *sb = dentry->d_sb;
313 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
314 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
315
316 buf->f_type = HFSPLUS_SUPER_MAGIC;
317 buf->f_bsize = sb->s_blocksize;
318 buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
319 buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
320 buf->f_bavail = buf->f_bfree;
321 buf->f_files = 0xFFFFFFFF;
322 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
323 buf->f_fsid.val[0] = (u32)id;
324 buf->f_fsid.val[1] = (u32)(id >> 32);
325 buf->f_namelen = HFSPLUS_MAX_STRLEN;
326
327 return 0;
328}
329
330static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
331{
332 sync_filesystem(sb);
333 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
334 return 0;
335 if (!(*flags & SB_RDONLY)) {
336 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
337 int force = 0;
338
339 if (!hfsplus_parse_options_remount(data, &force))
340 return -EINVAL;
341
342 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
343 pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n");
344 sb->s_flags |= SB_RDONLY;
345 *flags |= SB_RDONLY;
346 } else if (force) {
347 /* nothing */
348 } else if (vhdr->attributes &
349 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
350 pr_warn("filesystem is marked locked, leaving read-only.\n");
351 sb->s_flags |= SB_RDONLY;
352 *flags |= SB_RDONLY;
353 } else if (vhdr->attributes &
354 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
355 pr_warn("filesystem is marked journaled, leaving read-only.\n");
356 sb->s_flags |= SB_RDONLY;
357 *flags |= SB_RDONLY;
358 }
359 }
360 return 0;
361}
362
363static const struct super_operations hfsplus_sops = {
364 .alloc_inode = hfsplus_alloc_inode,
365 .free_inode = hfsplus_free_inode,
366 .write_inode = hfsplus_write_inode,
367 .evict_inode = hfsplus_evict_inode,
368 .put_super = hfsplus_put_super,
369 .sync_fs = hfsplus_sync_fs,
370 .statfs = hfsplus_statfs,
371 .remount_fs = hfsplus_remount,
372 .show_options = hfsplus_show_options,
373};
374
375static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
376{
377 struct hfsplus_vh *vhdr;
378 struct hfsplus_sb_info *sbi;
379 hfsplus_cat_entry entry;
380 struct hfs_find_data fd;
381 struct inode *root, *inode;
382 struct qstr str;
383 struct nls_table *nls = NULL;
384 u64 last_fs_block, last_fs_page;
385 int err;
386
387 err = -ENOMEM;
388 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
389 if (!sbi)
390 goto out;
391
392 sb->s_fs_info = sbi;
393 mutex_init(&sbi->alloc_mutex);
394 mutex_init(&sbi->vh_mutex);
395 spin_lock_init(&sbi->work_lock);
396 INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
397 hfsplus_fill_defaults(sbi);
398
399 err = -EINVAL;
400 if (!hfsplus_parse_options(data, sbi)) {
401 pr_err("unable to parse mount options\n");
402 goto out_unload_nls;
403 }
404
405 /* temporarily use utf8 to correctly find the hidden dir below */
406 nls = sbi->nls;
407 sbi->nls = load_nls("utf8");
408 if (!sbi->nls) {
409 pr_err("unable to load nls for utf8\n");
410 goto out_unload_nls;
411 }
412
413 /* Grab the volume header */
414 if (hfsplus_read_wrapper(sb)) {
415 if (!silent)
416 pr_warn("unable to find HFS+ superblock\n");
417 goto out_unload_nls;
418 }
419 vhdr = sbi->s_vhdr;
420
421 /* Copy parts of the volume header into the superblock */
422 sb->s_magic = HFSPLUS_VOLHEAD_SIG;
423 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
424 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
425 pr_err("wrong filesystem version\n");
426 goto out_free_vhdr;
427 }
428 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
429 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
430 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
431 sbi->file_count = be32_to_cpu(vhdr->file_count);
432 sbi->folder_count = be32_to_cpu(vhdr->folder_count);
433 sbi->data_clump_blocks =
434 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
435 if (!sbi->data_clump_blocks)
436 sbi->data_clump_blocks = 1;
437 sbi->rsrc_clump_blocks =
438 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
439 if (!sbi->rsrc_clump_blocks)
440 sbi->rsrc_clump_blocks = 1;
441
442 err = -EFBIG;
443 last_fs_block = sbi->total_blocks - 1;
444 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
445 PAGE_SHIFT;
446
447 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
448 (last_fs_page > (pgoff_t)(~0ULL))) {
449 pr_err("filesystem size too large\n");
450 goto out_free_vhdr;
451 }
452
453 /* Set up operations so we can load metadata */
454 sb->s_op = &hfsplus_sops;
455 sb->s_maxbytes = MAX_LFS_FILESIZE;
456
457 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
458 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.\n");
459 sb->s_flags |= SB_RDONLY;
460 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
461 /* nothing */
462 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
463 pr_warn("Filesystem is marked locked, mounting read-only.\n");
464 sb->s_flags |= SB_RDONLY;
465 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
466 !sb_rdonly(sb)) {
467 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
468 sb->s_flags |= SB_RDONLY;
469 }
470
471 err = -EINVAL;
472
473 /* Load metadata objects (B*Trees) */
474 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
475 if (!sbi->ext_tree) {
476 pr_err("failed to load extents file\n");
477 goto out_free_vhdr;
478 }
479 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
480 if (!sbi->cat_tree) {
481 pr_err("failed to load catalog file\n");
482 goto out_close_ext_tree;
483 }
484 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
485 if (vhdr->attr_file.total_blocks != 0) {
486 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
487 if (!sbi->attr_tree) {
488 pr_err("failed to load attributes file\n");
489 goto out_close_cat_tree;
490 }
491 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
492 }
493 sb->s_xattr = hfsplus_xattr_handlers;
494
495 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
496 if (IS_ERR(inode)) {
497 pr_err("failed to load allocation file\n");
498 err = PTR_ERR(inode);
499 goto out_close_attr_tree;
500 }
501 sbi->alloc_file = inode;
502
503 /* Load the root directory */
504 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
505 if (IS_ERR(root)) {
506 pr_err("failed to load root directory\n");
507 err = PTR_ERR(root);
508 goto out_put_alloc_file;
509 }
510
511 sb->s_d_op = &hfsplus_dentry_operations;
512 sb->s_root = d_make_root(root);
513 if (!sb->s_root) {
514 err = -ENOMEM;
515 goto out_put_alloc_file;
516 }
517
518 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
519 str.name = HFSP_HIDDENDIR_NAME;
520 err = hfs_find_init(sbi->cat_tree, &fd);
521 if (err)
522 goto out_put_root;
523 err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
524 if (unlikely(err < 0))
525 goto out_put_root;
526 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
527 hfs_find_exit(&fd);
528 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) {
529 err = -EINVAL;
530 goto out_put_root;
531 }
532 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
533 if (IS_ERR(inode)) {
534 err = PTR_ERR(inode);
535 goto out_put_root;
536 }
537 sbi->hidden_dir = inode;
538 } else
539 hfs_find_exit(&fd);
540
541 if (!sb_rdonly(sb)) {
542 /*
543 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
544 * all three are registered with Apple for our use
545 */
546 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
547 vhdr->modify_date = hfsp_now2mt();
548 be32_add_cpu(&vhdr->write_count, 1);
549 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
550 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
551 hfsplus_sync_fs(sb, 1);
552
553 if (!sbi->hidden_dir) {
554 mutex_lock(&sbi->vh_mutex);
555 sbi->hidden_dir = hfsplus_new_inode(sb, root, S_IFDIR);
556 if (!sbi->hidden_dir) {
557 mutex_unlock(&sbi->vh_mutex);
558 err = -ENOMEM;
559 goto out_put_root;
560 }
561 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
562 &str, sbi->hidden_dir);
563 if (err) {
564 mutex_unlock(&sbi->vh_mutex);
565 goto out_put_hidden_dir;
566 }
567
568 err = hfsplus_init_security(sbi->hidden_dir,
569 root, &str);
570 if (err == -EOPNOTSUPP)
571 err = 0; /* Operation is not supported. */
572 else if (err) {
573 /*
574 * Try to delete anyway without
575 * error analysis.
576 */
577 hfsplus_delete_cat(sbi->hidden_dir->i_ino,
578 root, &str);
579 mutex_unlock(&sbi->vh_mutex);
580 goto out_put_hidden_dir;
581 }
582
583 mutex_unlock(&sbi->vh_mutex);
584 hfsplus_mark_inode_dirty(sbi->hidden_dir,
585 HFSPLUS_I_CAT_DIRTY);
586 }
587 }
588
589 unload_nls(sbi->nls);
590 sbi->nls = nls;
591 return 0;
592
593out_put_hidden_dir:
594 cancel_delayed_work_sync(&sbi->sync_work);
595 iput(sbi->hidden_dir);
596out_put_root:
597 dput(sb->s_root);
598 sb->s_root = NULL;
599out_put_alloc_file:
600 iput(sbi->alloc_file);
601out_close_attr_tree:
602 hfs_btree_close(sbi->attr_tree);
603out_close_cat_tree:
604 hfs_btree_close(sbi->cat_tree);
605out_close_ext_tree:
606 hfs_btree_close(sbi->ext_tree);
607out_free_vhdr:
608 kfree(sbi->s_vhdr_buf);
609 kfree(sbi->s_backup_vhdr_buf);
610out_unload_nls:
611 unload_nls(sbi->nls);
612 unload_nls(nls);
613 kfree(sbi);
614out:
615 return err;
616}
617
618MODULE_AUTHOR("Brad Boyer");
619MODULE_DESCRIPTION("Extended Macintosh Filesystem");
620MODULE_LICENSE("GPL");
621
622static struct kmem_cache *hfsplus_inode_cachep;
623
624static struct inode *hfsplus_alloc_inode(struct super_block *sb)
625{
626 struct hfsplus_inode_info *i;
627
628 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
629 return i ? &i->vfs_inode : NULL;
630}
631
632static void hfsplus_free_inode(struct inode *inode)
633{
634 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
635}
636
637#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
638
639static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
640 int flags, const char *dev_name, void *data)
641{
642 return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
643}
644
645static struct file_system_type hfsplus_fs_type = {
646 .owner = THIS_MODULE,
647 .name = "hfsplus",
648 .mount = hfsplus_mount,
649 .kill_sb = kill_block_super,
650 .fs_flags = FS_REQUIRES_DEV,
651};
652MODULE_ALIAS_FS("hfsplus");
653
654static void hfsplus_init_once(void *p)
655{
656 struct hfsplus_inode_info *i = p;
657
658 inode_init_once(&i->vfs_inode);
659}
660
661static int __init init_hfsplus_fs(void)
662{
663 int err;
664
665 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
666 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
667 hfsplus_init_once);
668 if (!hfsplus_inode_cachep)
669 return -ENOMEM;
670 err = hfsplus_create_attr_tree_cache();
671 if (err)
672 goto destroy_inode_cache;
673 err = register_filesystem(&hfsplus_fs_type);
674 if (err)
675 goto destroy_attr_tree_cache;
676 return 0;
677
678destroy_attr_tree_cache:
679 hfsplus_destroy_attr_tree_cache();
680
681destroy_inode_cache:
682 kmem_cache_destroy(hfsplus_inode_cachep);
683
684 return err;
685}
686
687static void __exit exit_hfsplus_fs(void)
688{
689 unregister_filesystem(&hfsplus_fs_type);
690
691 /*
692 * Make sure all delayed rcu free inodes are flushed before we
693 * destroy cache.
694 */
695 rcu_barrier();
696 hfsplus_destroy_attr_tree_cache();
697 kmem_cache_destroy(hfsplus_inode_cachep);
698}
699
700module_init(init_hfsplus_fs)
701module_exit(exit_hfsplus_fs)
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
22static struct inode *hfsplus_alloc_inode(struct super_block *sb);
23static void hfsplus_free_inode(struct inode *inode);
24
25#include "hfsplus_fs.h"
26#include "xattr.h"
27
28static 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
59struct 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
101static 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
148static 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
166static 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
177static 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 REQ_SYNC);
227 if (!error)
228 error = error2;
229 if (!write_backup)
230 goto out;
231
232 error2 = hfsplus_submit_bio(sb,
233 sbi->part_start + sbi->sect_count - 2,
234 sbi->s_backup_vhdr_buf, NULL, REQ_OP_WRITE |
235 REQ_SYNC);
236 if (!error)
237 error2 = error;
238out:
239 mutex_unlock(&sbi->alloc_mutex);
240 mutex_unlock(&sbi->vh_mutex);
241
242 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
243 blkdev_issue_flush(sb->s_bdev);
244
245 return error;
246}
247
248static void delayed_sync_fs(struct work_struct *work)
249{
250 int err;
251 struct hfsplus_sb_info *sbi;
252
253 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
254
255 spin_lock(&sbi->work_lock);
256 sbi->work_queued = 0;
257 spin_unlock(&sbi->work_lock);
258
259 err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
260 if (err)
261 pr_err("delayed sync fs err %d\n", err);
262}
263
264void hfsplus_mark_mdb_dirty(struct super_block *sb)
265{
266 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
267 unsigned long delay;
268
269 if (sb_rdonly(sb))
270 return;
271
272 spin_lock(&sbi->work_lock);
273 if (!sbi->work_queued) {
274 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
275 queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
276 sbi->work_queued = 1;
277 }
278 spin_unlock(&sbi->work_lock);
279}
280
281static void delayed_free(struct rcu_head *p)
282{
283 struct hfsplus_sb_info *sbi = container_of(p, struct hfsplus_sb_info, rcu);
284
285 unload_nls(sbi->nls);
286 kfree(sbi);
287}
288
289static void hfsplus_put_super(struct super_block *sb)
290{
291 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
292
293 hfs_dbg(SUPER, "hfsplus_put_super\n");
294
295 cancel_delayed_work_sync(&sbi->sync_work);
296
297 if (!sb_rdonly(sb) && sbi->s_vhdr) {
298 struct hfsplus_vh *vhdr = sbi->s_vhdr;
299
300 vhdr->modify_date = hfsp_now2mt();
301 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
302 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
303
304 hfsplus_sync_fs(sb, 1);
305 }
306
307 iput(sbi->alloc_file);
308 iput(sbi->hidden_dir);
309 hfs_btree_close(sbi->attr_tree);
310 hfs_btree_close(sbi->cat_tree);
311 hfs_btree_close(sbi->ext_tree);
312 kfree(sbi->s_vhdr_buf);
313 kfree(sbi->s_backup_vhdr_buf);
314 call_rcu(&sbi->rcu, delayed_free);
315}
316
317static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
318{
319 struct super_block *sb = dentry->d_sb;
320 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
321 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
322
323 buf->f_type = HFSPLUS_SUPER_MAGIC;
324 buf->f_bsize = sb->s_blocksize;
325 buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
326 buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
327 buf->f_bavail = buf->f_bfree;
328 buf->f_files = 0xFFFFFFFF;
329 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
330 buf->f_fsid = u64_to_fsid(id);
331 buf->f_namelen = HFSPLUS_MAX_STRLEN;
332
333 return 0;
334}
335
336static int hfsplus_reconfigure(struct fs_context *fc)
337{
338 struct super_block *sb = fc->root->d_sb;
339
340 sync_filesystem(sb);
341 if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb))
342 return 0;
343 if (!(fc->sb_flags & SB_RDONLY)) {
344 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
345 struct hfsplus_vh *vhdr = sbi->s_vhdr;
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 fc->sb_flags |= SB_RDONLY;
351 } else if (test_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
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 fc->sb_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 fc->sb_flags |= SB_RDONLY;
363 }
364 }
365 return 0;
366}
367
368static 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 .show_options = hfsplus_show_options,
377};
378
379static int hfsplus_fill_super(struct super_block *sb, struct fs_context *fc)
380{
381 struct hfsplus_vh *vhdr;
382 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
383 hfsplus_cat_entry entry;
384 struct hfs_find_data fd;
385 struct inode *root, *inode;
386 struct qstr str;
387 struct nls_table *nls;
388 u64 last_fs_block, last_fs_page;
389 int silent = fc->sb_flags & SB_SILENT;
390 int err;
391
392 mutex_init(&sbi->alloc_mutex);
393 mutex_init(&sbi->vh_mutex);
394 spin_lock_init(&sbi->work_lock);
395 INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
396
397 err = -EINVAL;
398 if (!sbi->nls) {
399 /* try utf8 first, as this is the old default behaviour */
400 sbi->nls = load_nls("utf8");
401 if (!sbi->nls)
402 sbi->nls = load_nls_default();
403 }
404
405 /* temporarily use utf8 to correctly find the hidden dir below */
406 nls = sbi->nls;
407 sbi->nls = load_nls("utf8");
408 if (!sbi->nls) {
409 pr_err("unable to load nls for utf8\n");
410 goto out_unload_nls;
411 }
412
413 /* Grab the volume header */
414 if (hfsplus_read_wrapper(sb)) {
415 if (!silent)
416 pr_warn("unable to find HFS+ superblock\n");
417 goto out_unload_nls;
418 }
419 vhdr = sbi->s_vhdr;
420
421 /* Copy parts of the volume header into the superblock */
422 sb->s_magic = HFSPLUS_VOLHEAD_SIG;
423 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
424 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
425 pr_err("wrong filesystem version\n");
426 goto out_free_vhdr;
427 }
428 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
429 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
430 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
431 sbi->file_count = be32_to_cpu(vhdr->file_count);
432 sbi->folder_count = be32_to_cpu(vhdr->folder_count);
433 sbi->data_clump_blocks =
434 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
435 if (!sbi->data_clump_blocks)
436 sbi->data_clump_blocks = 1;
437 sbi->rsrc_clump_blocks =
438 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
439 if (!sbi->rsrc_clump_blocks)
440 sbi->rsrc_clump_blocks = 1;
441
442 err = -EFBIG;
443 last_fs_block = sbi->total_blocks - 1;
444 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
445 PAGE_SHIFT;
446
447 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
448 (last_fs_page > (pgoff_t)(~0ULL))) {
449 pr_err("filesystem size too large\n");
450 goto out_free_vhdr;
451 }
452
453 /* Set up operations so we can load metadata */
454 sb->s_op = &hfsplus_sops;
455 sb->s_maxbytes = MAX_LFS_FILESIZE;
456
457 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
458 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.\n");
459 sb->s_flags |= SB_RDONLY;
460 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
461 /* nothing */
462 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
463 pr_warn("Filesystem is marked locked, mounting read-only.\n");
464 sb->s_flags |= SB_RDONLY;
465 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
466 !sb_rdonly(sb)) {
467 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
468 sb->s_flags |= SB_RDONLY;
469 }
470
471 err = -EINVAL;
472
473 /* Load metadata objects (B*Trees) */
474 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
475 if (!sbi->ext_tree) {
476 pr_err("failed to load extents file\n");
477 goto out_free_vhdr;
478 }
479 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
480 if (!sbi->cat_tree) {
481 pr_err("failed to load catalog file\n");
482 goto out_close_ext_tree;
483 }
484 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
485 if (vhdr->attr_file.total_blocks != 0) {
486 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
487 if (!sbi->attr_tree) {
488 pr_err("failed to load attributes file\n");
489 goto out_close_cat_tree;
490 }
491 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
492 }
493 sb->s_xattr = hfsplus_xattr_handlers;
494
495 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
496 if (IS_ERR(inode)) {
497 pr_err("failed to load allocation file\n");
498 err = PTR_ERR(inode);
499 goto out_close_attr_tree;
500 }
501 sbi->alloc_file = inode;
502
503 /* Load the root directory */
504 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
505 if (IS_ERR(root)) {
506 pr_err("failed to load root directory\n");
507 err = PTR_ERR(root);
508 goto out_put_alloc_file;
509 }
510
511 sb->s_d_op = &hfsplus_dentry_operations;
512 sb->s_root = d_make_root(root);
513 if (!sb->s_root) {
514 err = -ENOMEM;
515 goto out_put_alloc_file;
516 }
517
518 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
519 str.name = HFSP_HIDDENDIR_NAME;
520 err = hfs_find_init(sbi->cat_tree, &fd);
521 if (err)
522 goto out_put_root;
523 err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
524 if (unlikely(err < 0))
525 goto out_put_root;
526 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
527 hfs_find_exit(&fd);
528 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) {
529 err = -EINVAL;
530 goto out_put_root;
531 }
532 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
533 if (IS_ERR(inode)) {
534 err = PTR_ERR(inode);
535 goto out_put_root;
536 }
537 sbi->hidden_dir = inode;
538 } else
539 hfs_find_exit(&fd);
540
541 if (!sb_rdonly(sb)) {
542 /*
543 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
544 * all three are registered with Apple for our use
545 */
546 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
547 vhdr->modify_date = hfsp_now2mt();
548 be32_add_cpu(&vhdr->write_count, 1);
549 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
550 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
551 hfsplus_sync_fs(sb, 1);
552
553 if (!sbi->hidden_dir) {
554 mutex_lock(&sbi->vh_mutex);
555 sbi->hidden_dir = hfsplus_new_inode(sb, root, S_IFDIR);
556 if (!sbi->hidden_dir) {
557 mutex_unlock(&sbi->vh_mutex);
558 err = -ENOMEM;
559 goto out_put_root;
560 }
561 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
562 &str, sbi->hidden_dir);
563 if (err) {
564 mutex_unlock(&sbi->vh_mutex);
565 goto out_put_hidden_dir;
566 }
567
568 err = hfsplus_init_security(sbi->hidden_dir,
569 root, &str);
570 if (err == -EOPNOTSUPP)
571 err = 0; /* Operation is not supported. */
572 else if (err) {
573 /*
574 * Try to delete anyway without
575 * error analysis.
576 */
577 hfsplus_delete_cat(sbi->hidden_dir->i_ino,
578 root, &str);
579 mutex_unlock(&sbi->vh_mutex);
580 goto out_put_hidden_dir;
581 }
582
583 mutex_unlock(&sbi->vh_mutex);
584 hfsplus_mark_inode_dirty(sbi->hidden_dir,
585 HFSPLUS_I_CAT_DIRTY);
586 }
587 }
588
589 unload_nls(sbi->nls);
590 sbi->nls = nls;
591 return 0;
592
593out_put_hidden_dir:
594 cancel_delayed_work_sync(&sbi->sync_work);
595 iput(sbi->hidden_dir);
596out_put_root:
597 dput(sb->s_root);
598 sb->s_root = NULL;
599out_put_alloc_file:
600 iput(sbi->alloc_file);
601out_close_attr_tree:
602 hfs_btree_close(sbi->attr_tree);
603out_close_cat_tree:
604 hfs_btree_close(sbi->cat_tree);
605out_close_ext_tree:
606 hfs_btree_close(sbi->ext_tree);
607out_free_vhdr:
608 kfree(sbi->s_vhdr_buf);
609 kfree(sbi->s_backup_vhdr_buf);
610out_unload_nls:
611 unload_nls(sbi->nls);
612 unload_nls(nls);
613 kfree(sbi);
614 return err;
615}
616
617MODULE_AUTHOR("Brad Boyer");
618MODULE_DESCRIPTION("Extended Macintosh Filesystem");
619MODULE_LICENSE("GPL");
620
621static struct kmem_cache *hfsplus_inode_cachep;
622
623static struct inode *hfsplus_alloc_inode(struct super_block *sb)
624{
625 struct hfsplus_inode_info *i;
626
627 i = alloc_inode_sb(sb, hfsplus_inode_cachep, GFP_KERNEL);
628 return i ? &i->vfs_inode : NULL;
629}
630
631static void hfsplus_free_inode(struct inode *inode)
632{
633 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
634}
635
636#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
637
638static int hfsplus_get_tree(struct fs_context *fc)
639{
640 return get_tree_bdev(fc, hfsplus_fill_super);
641}
642
643static void hfsplus_free_fc(struct fs_context *fc)
644{
645 kfree(fc->s_fs_info);
646}
647
648static const struct fs_context_operations hfsplus_context_ops = {
649 .parse_param = hfsplus_parse_param,
650 .get_tree = hfsplus_get_tree,
651 .reconfigure = hfsplus_reconfigure,
652 .free = hfsplus_free_fc,
653};
654
655static int hfsplus_init_fs_context(struct fs_context *fc)
656{
657 struct hfsplus_sb_info *sbi;
658
659 sbi = kzalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
660 if (!sbi)
661 return -ENOMEM;
662
663 if (fc->purpose != FS_CONTEXT_FOR_RECONFIGURE)
664 hfsplus_fill_defaults(sbi);
665
666 fc->s_fs_info = sbi;
667 fc->ops = &hfsplus_context_ops;
668
669 return 0;
670}
671
672static struct file_system_type hfsplus_fs_type = {
673 .owner = THIS_MODULE,
674 .name = "hfsplus",
675 .kill_sb = kill_block_super,
676 .fs_flags = FS_REQUIRES_DEV,
677 .init_fs_context = hfsplus_init_fs_context,
678};
679MODULE_ALIAS_FS("hfsplus");
680
681static void hfsplus_init_once(void *p)
682{
683 struct hfsplus_inode_info *i = p;
684
685 inode_init_once(&i->vfs_inode);
686}
687
688static int __init init_hfsplus_fs(void)
689{
690 int err;
691
692 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
693 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
694 hfsplus_init_once);
695 if (!hfsplus_inode_cachep)
696 return -ENOMEM;
697 err = hfsplus_create_attr_tree_cache();
698 if (err)
699 goto destroy_inode_cache;
700 err = register_filesystem(&hfsplus_fs_type);
701 if (err)
702 goto destroy_attr_tree_cache;
703 return 0;
704
705destroy_attr_tree_cache:
706 hfsplus_destroy_attr_tree_cache();
707
708destroy_inode_cache:
709 kmem_cache_destroy(hfsplus_inode_cachep);
710
711 return err;
712}
713
714static void __exit exit_hfsplus_fs(void)
715{
716 unregister_filesystem(&hfsplus_fs_type);
717
718 /*
719 * Make sure all delayed rcu free inodes are flushed before we
720 * destroy cache.
721 */
722 rcu_barrier();
723 hfsplus_destroy_attr_tree_cache();
724 kmem_cache_destroy(hfsplus_inode_cachep);
725}
726
727module_init(init_hfsplus_fs)
728module_exit(exit_hfsplus_fs)