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1/*
2 * linux/fs/hfsplus/super.c
3 *
4 * Copyright (C) 2001
5 * Brad Boyer (flar@allandria.com)
6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
7 *
8 */
9
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/pagemap.h>
13#include <linux/blkdev.h>
14#include <linux/backing-dev.h>
15#include <linux/fs.h>
16#include <linux/slab.h>
17#include <linux/vfs.h>
18#include <linux/nls.h>
19
20static struct inode *hfsplus_alloc_inode(struct super_block *sb);
21static void hfsplus_destroy_inode(struct inode *inode);
22
23#include "hfsplus_fs.h"
24#include "xattr.h"
25
26static int hfsplus_system_read_inode(struct inode *inode)
27{
28 struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
29
30 switch (inode->i_ino) {
31 case HFSPLUS_EXT_CNID:
32 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
33 inode->i_mapping->a_ops = &hfsplus_btree_aops;
34 break;
35 case HFSPLUS_CAT_CNID:
36 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
37 inode->i_mapping->a_ops = &hfsplus_btree_aops;
38 break;
39 case HFSPLUS_ALLOC_CNID:
40 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
41 inode->i_mapping->a_ops = &hfsplus_aops;
42 break;
43 case HFSPLUS_START_CNID:
44 hfsplus_inode_read_fork(inode, &vhdr->start_file);
45 break;
46 case HFSPLUS_ATTR_CNID:
47 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
48 inode->i_mapping->a_ops = &hfsplus_btree_aops;
49 break;
50 default:
51 return -EIO;
52 }
53
54 return 0;
55}
56
57struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
58{
59 struct hfs_find_data fd;
60 struct inode *inode;
61 int err;
62
63 inode = iget_locked(sb, ino);
64 if (!inode)
65 return ERR_PTR(-ENOMEM);
66 if (!(inode->i_state & I_NEW))
67 return inode;
68
69 INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
70 mutex_init(&HFSPLUS_I(inode)->extents_lock);
71 HFSPLUS_I(inode)->flags = 0;
72 HFSPLUS_I(inode)->extent_state = 0;
73 HFSPLUS_I(inode)->rsrc_inode = NULL;
74 atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
75
76 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
77 inode->i_ino == HFSPLUS_ROOT_CNID) {
78 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
79 if (!err) {
80 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
81 if (!err)
82 err = hfsplus_cat_read_inode(inode, &fd);
83 hfs_find_exit(&fd);
84 }
85 } else {
86 err = hfsplus_system_read_inode(inode);
87 }
88
89 if (err) {
90 iget_failed(inode);
91 return ERR_PTR(err);
92 }
93
94 unlock_new_inode(inode);
95 return inode;
96}
97
98static int hfsplus_system_write_inode(struct inode *inode)
99{
100 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
101 struct hfsplus_vh *vhdr = sbi->s_vhdr;
102 struct hfsplus_fork_raw *fork;
103 struct hfs_btree *tree = NULL;
104
105 switch (inode->i_ino) {
106 case HFSPLUS_EXT_CNID:
107 fork = &vhdr->ext_file;
108 tree = sbi->ext_tree;
109 break;
110 case HFSPLUS_CAT_CNID:
111 fork = &vhdr->cat_file;
112 tree = sbi->cat_tree;
113 break;
114 case HFSPLUS_ALLOC_CNID:
115 fork = &vhdr->alloc_file;
116 break;
117 case HFSPLUS_START_CNID:
118 fork = &vhdr->start_file;
119 break;
120 case HFSPLUS_ATTR_CNID:
121 fork = &vhdr->attr_file;
122 tree = sbi->attr_tree;
123 break;
124 default:
125 return -EIO;
126 }
127
128 if (fork->total_size != cpu_to_be64(inode->i_size)) {
129 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
130 hfsplus_mark_mdb_dirty(inode->i_sb);
131 }
132 hfsplus_inode_write_fork(inode, fork);
133 if (tree) {
134 int err = hfs_btree_write(tree);
135
136 if (err) {
137 pr_err("b-tree write err: %d, ino %lu\n",
138 err, inode->i_ino);
139 return err;
140 }
141 }
142 return 0;
143}
144
145static int hfsplus_write_inode(struct inode *inode,
146 struct writeback_control *wbc)
147{
148 int err;
149
150 hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
151
152 err = hfsplus_ext_write_extent(inode);
153 if (err)
154 return err;
155
156 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
157 inode->i_ino == HFSPLUS_ROOT_CNID)
158 return hfsplus_cat_write_inode(inode);
159 else
160 return hfsplus_system_write_inode(inode);
161}
162
163static void hfsplus_evict_inode(struct inode *inode)
164{
165 hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
166 truncate_inode_pages_final(&inode->i_data);
167 clear_inode(inode);
168 if (HFSPLUS_IS_RSRC(inode)) {
169 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
170 iput(HFSPLUS_I(inode)->rsrc_inode);
171 }
172}
173
174static int hfsplus_sync_fs(struct super_block *sb, int wait)
175{
176 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
177 struct hfsplus_vh *vhdr = sbi->s_vhdr;
178 int write_backup = 0;
179 int error, error2;
180
181 if (!wait)
182 return 0;
183
184 hfs_dbg(SUPER, "hfsplus_sync_fs\n");
185
186 /*
187 * Explicitly write out the special metadata inodes.
188 *
189 * While these special inodes are marked as hashed and written
190 * out peridocically by the flusher threads we redirty them
191 * during writeout of normal inodes, and thus the life lock
192 * prevents us from getting the latest state to disk.
193 */
194 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
195 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
196 if (!error)
197 error = error2;
198 if (sbi->attr_tree) {
199 error2 =
200 filemap_write_and_wait(sbi->attr_tree->inode->i_mapping);
201 if (!error)
202 error = error2;
203 }
204 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
205 if (!error)
206 error = error2;
207
208 mutex_lock(&sbi->vh_mutex);
209 mutex_lock(&sbi->alloc_mutex);
210 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
211 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
212 vhdr->folder_count = cpu_to_be32(sbi->folder_count);
213 vhdr->file_count = cpu_to_be32(sbi->file_count);
214
215 if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
216 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
217 write_backup = 1;
218 }
219
220 error2 = hfsplus_submit_bio(sb,
221 sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
222 sbi->s_vhdr_buf, NULL, WRITE_SYNC);
223 if (!error)
224 error = error2;
225 if (!write_backup)
226 goto out;
227
228 error2 = hfsplus_submit_bio(sb,
229 sbi->part_start + sbi->sect_count - 2,
230 sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC);
231 if (!error)
232 error2 = error;
233out:
234 mutex_unlock(&sbi->alloc_mutex);
235 mutex_unlock(&sbi->vh_mutex);
236
237 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
238 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
239
240 return error;
241}
242
243static void delayed_sync_fs(struct work_struct *work)
244{
245 int err;
246 struct hfsplus_sb_info *sbi;
247
248 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
249
250 spin_lock(&sbi->work_lock);
251 sbi->work_queued = 0;
252 spin_unlock(&sbi->work_lock);
253
254 err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
255 if (err)
256 pr_err("delayed sync fs err %d\n", err);
257}
258
259void hfsplus_mark_mdb_dirty(struct super_block *sb)
260{
261 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
262 unsigned long delay;
263
264 if (sb->s_flags & MS_RDONLY)
265 return;
266
267 spin_lock(&sbi->work_lock);
268 if (!sbi->work_queued) {
269 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
270 queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
271 sbi->work_queued = 1;
272 }
273 spin_unlock(&sbi->work_lock);
274}
275
276static void hfsplus_put_super(struct super_block *sb)
277{
278 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
279
280 hfs_dbg(SUPER, "hfsplus_put_super\n");
281
282 cancel_delayed_work_sync(&sbi->sync_work);
283
284 if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
285 struct hfsplus_vh *vhdr = sbi->s_vhdr;
286
287 vhdr->modify_date = hfsp_now2mt();
288 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
289 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
290
291 hfsplus_sync_fs(sb, 1);
292 }
293
294 hfs_btree_close(sbi->attr_tree);
295 hfs_btree_close(sbi->cat_tree);
296 hfs_btree_close(sbi->ext_tree);
297 iput(sbi->alloc_file);
298 iput(sbi->hidden_dir);
299 kfree(sbi->s_vhdr_buf);
300 kfree(sbi->s_backup_vhdr_buf);
301 unload_nls(sbi->nls);
302 kfree(sb->s_fs_info);
303 sb->s_fs_info = NULL;
304}
305
306static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
307{
308 struct super_block *sb = dentry->d_sb;
309 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
310 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
311
312 buf->f_type = HFSPLUS_SUPER_MAGIC;
313 buf->f_bsize = sb->s_blocksize;
314 buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
315 buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
316 buf->f_bavail = buf->f_bfree;
317 buf->f_files = 0xFFFFFFFF;
318 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
319 buf->f_fsid.val[0] = (u32)id;
320 buf->f_fsid.val[1] = (u32)(id >> 32);
321 buf->f_namelen = HFSPLUS_MAX_STRLEN;
322
323 return 0;
324}
325
326static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
327{
328 sync_filesystem(sb);
329 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
330 return 0;
331 if (!(*flags & MS_RDONLY)) {
332 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
333 int force = 0;
334
335 if (!hfsplus_parse_options_remount(data, &force))
336 return -EINVAL;
337
338 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
339 pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n");
340 sb->s_flags |= MS_RDONLY;
341 *flags |= MS_RDONLY;
342 } else if (force) {
343 /* nothing */
344 } else if (vhdr->attributes &
345 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
346 pr_warn("filesystem is marked locked, leaving read-only.\n");
347 sb->s_flags |= MS_RDONLY;
348 *flags |= MS_RDONLY;
349 } else if (vhdr->attributes &
350 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
351 pr_warn("filesystem is marked journaled, leaving read-only.\n");
352 sb->s_flags |= MS_RDONLY;
353 *flags |= MS_RDONLY;
354 }
355 }
356 return 0;
357}
358
359static const struct super_operations hfsplus_sops = {
360 .alloc_inode = hfsplus_alloc_inode,
361 .destroy_inode = hfsplus_destroy_inode,
362 .write_inode = hfsplus_write_inode,
363 .evict_inode = hfsplus_evict_inode,
364 .put_super = hfsplus_put_super,
365 .sync_fs = hfsplus_sync_fs,
366 .statfs = hfsplus_statfs,
367 .remount_fs = hfsplus_remount,
368 .show_options = hfsplus_show_options,
369};
370
371static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
372{
373 struct hfsplus_vh *vhdr;
374 struct hfsplus_sb_info *sbi;
375 hfsplus_cat_entry entry;
376 struct hfs_find_data fd;
377 struct inode *root, *inode;
378 struct qstr str;
379 struct nls_table *nls = NULL;
380 u64 last_fs_block, last_fs_page;
381 int err;
382
383 err = -ENOMEM;
384 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
385 if (!sbi)
386 goto out;
387
388 sb->s_fs_info = sbi;
389 mutex_init(&sbi->alloc_mutex);
390 mutex_init(&sbi->vh_mutex);
391 spin_lock_init(&sbi->work_lock);
392 INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
393 hfsplus_fill_defaults(sbi);
394
395 err = -EINVAL;
396 if (!hfsplus_parse_options(data, sbi)) {
397 pr_err("unable to parse mount options\n");
398 goto out_unload_nls;
399 }
400
401 /* temporarily use utf8 to correctly find the hidden dir below */
402 nls = sbi->nls;
403 sbi->nls = load_nls("utf8");
404 if (!sbi->nls) {
405 pr_err("unable to load nls for utf8\n");
406 goto out_unload_nls;
407 }
408
409 /* Grab the volume header */
410 if (hfsplus_read_wrapper(sb)) {
411 if (!silent)
412 pr_warn("unable to find HFS+ superblock\n");
413 goto out_unload_nls;
414 }
415 vhdr = sbi->s_vhdr;
416
417 /* Copy parts of the volume header into the superblock */
418 sb->s_magic = HFSPLUS_VOLHEAD_SIG;
419 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
420 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
421 pr_err("wrong filesystem version\n");
422 goto out_free_vhdr;
423 }
424 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
425 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
426 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
427 sbi->file_count = be32_to_cpu(vhdr->file_count);
428 sbi->folder_count = be32_to_cpu(vhdr->folder_count);
429 sbi->data_clump_blocks =
430 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
431 if (!sbi->data_clump_blocks)
432 sbi->data_clump_blocks = 1;
433 sbi->rsrc_clump_blocks =
434 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
435 if (!sbi->rsrc_clump_blocks)
436 sbi->rsrc_clump_blocks = 1;
437
438 err = -EFBIG;
439 last_fs_block = sbi->total_blocks - 1;
440 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
441 PAGE_SHIFT;
442
443 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
444 (last_fs_page > (pgoff_t)(~0ULL))) {
445 pr_err("filesystem size too large\n");
446 goto out_free_vhdr;
447 }
448
449 /* Set up operations so we can load metadata */
450 sb->s_op = &hfsplus_sops;
451 sb->s_maxbytes = MAX_LFS_FILESIZE;
452
453 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
454 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.\n");
455 sb->s_flags |= MS_RDONLY;
456 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
457 /* nothing */
458 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
459 pr_warn("Filesystem is marked locked, mounting read-only.\n");
460 sb->s_flags |= MS_RDONLY;
461 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
462 !(sb->s_flags & MS_RDONLY)) {
463 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
464 sb->s_flags |= MS_RDONLY;
465 }
466
467 err = -EINVAL;
468
469 /* Load metadata objects (B*Trees) */
470 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
471 if (!sbi->ext_tree) {
472 pr_err("failed to load extents file\n");
473 goto out_free_vhdr;
474 }
475 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
476 if (!sbi->cat_tree) {
477 pr_err("failed to load catalog file\n");
478 goto out_close_ext_tree;
479 }
480 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
481 if (vhdr->attr_file.total_blocks != 0) {
482 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
483 if (!sbi->attr_tree) {
484 pr_err("failed to load attributes file\n");
485 goto out_close_cat_tree;
486 }
487 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
488 }
489 sb->s_xattr = hfsplus_xattr_handlers;
490
491 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
492 if (IS_ERR(inode)) {
493 pr_err("failed to load allocation file\n");
494 err = PTR_ERR(inode);
495 goto out_close_attr_tree;
496 }
497 sbi->alloc_file = inode;
498
499 /* Load the root directory */
500 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
501 if (IS_ERR(root)) {
502 pr_err("failed to load root directory\n");
503 err = PTR_ERR(root);
504 goto out_put_alloc_file;
505 }
506
507 sb->s_d_op = &hfsplus_dentry_operations;
508 sb->s_root = d_make_root(root);
509 if (!sb->s_root) {
510 err = -ENOMEM;
511 goto out_put_alloc_file;
512 }
513
514 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
515 str.name = HFSP_HIDDENDIR_NAME;
516 err = hfs_find_init(sbi->cat_tree, &fd);
517 if (err)
518 goto out_put_root;
519 err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
520 if (unlikely(err < 0))
521 goto out_put_root;
522 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
523 hfs_find_exit(&fd);
524 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
525 goto out_put_root;
526 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
527 if (IS_ERR(inode)) {
528 err = PTR_ERR(inode);
529 goto out_put_root;
530 }
531 sbi->hidden_dir = inode;
532 } else
533 hfs_find_exit(&fd);
534
535 if (!(sb->s_flags & MS_RDONLY)) {
536 /*
537 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
538 * all three are registered with Apple for our use
539 */
540 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
541 vhdr->modify_date = hfsp_now2mt();
542 be32_add_cpu(&vhdr->write_count, 1);
543 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
544 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
545 hfsplus_sync_fs(sb, 1);
546
547 if (!sbi->hidden_dir) {
548 mutex_lock(&sbi->vh_mutex);
549 sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
550 if (!sbi->hidden_dir) {
551 mutex_unlock(&sbi->vh_mutex);
552 err = -ENOMEM;
553 goto out_put_root;
554 }
555 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
556 &str, sbi->hidden_dir);
557 if (err) {
558 mutex_unlock(&sbi->vh_mutex);
559 goto out_put_hidden_dir;
560 }
561
562 err = hfsplus_init_inode_security(sbi->hidden_dir,
563 root, &str);
564 if (err == -EOPNOTSUPP)
565 err = 0; /* Operation is not supported. */
566 else if (err) {
567 /*
568 * Try to delete anyway without
569 * error analysis.
570 */
571 hfsplus_delete_cat(sbi->hidden_dir->i_ino,
572 root, &str);
573 mutex_unlock(&sbi->vh_mutex);
574 goto out_put_hidden_dir;
575 }
576
577 mutex_unlock(&sbi->vh_mutex);
578 hfsplus_mark_inode_dirty(sbi->hidden_dir,
579 HFSPLUS_I_CAT_DIRTY);
580 }
581 }
582
583 unload_nls(sbi->nls);
584 sbi->nls = nls;
585 return 0;
586
587out_put_hidden_dir:
588 iput(sbi->hidden_dir);
589out_put_root:
590 dput(sb->s_root);
591 sb->s_root = NULL;
592out_put_alloc_file:
593 iput(sbi->alloc_file);
594out_close_attr_tree:
595 hfs_btree_close(sbi->attr_tree);
596out_close_cat_tree:
597 hfs_btree_close(sbi->cat_tree);
598out_close_ext_tree:
599 hfs_btree_close(sbi->ext_tree);
600out_free_vhdr:
601 kfree(sbi->s_vhdr_buf);
602 kfree(sbi->s_backup_vhdr_buf);
603out_unload_nls:
604 unload_nls(sbi->nls);
605 unload_nls(nls);
606 kfree(sbi);
607out:
608 return err;
609}
610
611MODULE_AUTHOR("Brad Boyer");
612MODULE_DESCRIPTION("Extended Macintosh Filesystem");
613MODULE_LICENSE("GPL");
614
615static struct kmem_cache *hfsplus_inode_cachep;
616
617static struct inode *hfsplus_alloc_inode(struct super_block *sb)
618{
619 struct hfsplus_inode_info *i;
620
621 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
622 return i ? &i->vfs_inode : NULL;
623}
624
625static void hfsplus_i_callback(struct rcu_head *head)
626{
627 struct inode *inode = container_of(head, struct inode, i_rcu);
628
629 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
630}
631
632static void hfsplus_destroy_inode(struct inode *inode)
633{
634 call_rcu(&inode->i_rcu, hfsplus_i_callback);
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/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);
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 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
288static 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
316static 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
335static 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
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 .remount_fs = hfsplus_remount,
377 .show_options = hfsplus_show_options,
378};
379
380static 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
598out_put_hidden_dir:
599 cancel_delayed_work_sync(&sbi->sync_work);
600 iput(sbi->hidden_dir);
601out_put_root:
602 dput(sb->s_root);
603 sb->s_root = NULL;
604out_put_alloc_file:
605 iput(sbi->alloc_file);
606out_close_attr_tree:
607 hfs_btree_close(sbi->attr_tree);
608out_close_cat_tree:
609 hfs_btree_close(sbi->cat_tree);
610out_close_ext_tree:
611 hfs_btree_close(sbi->ext_tree);
612out_free_vhdr:
613 kfree(sbi->s_vhdr_buf);
614 kfree(sbi->s_backup_vhdr_buf);
615out_unload_nls:
616 unload_nls(sbi->nls);
617 unload_nls(nls);
618 kfree(sbi);
619out:
620 return err;
621}
622
623MODULE_AUTHOR("Brad Boyer");
624MODULE_DESCRIPTION("Extended Macintosh Filesystem");
625MODULE_LICENSE("GPL");
626
627static struct kmem_cache *hfsplus_inode_cachep;
628
629static 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
637static 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
644static 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
650static 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};
657MODULE_ALIAS_FS("hfsplus");
658
659static void hfsplus_init_once(void *p)
660{
661 struct hfsplus_inode_info *i = p;
662
663 inode_init_once(&i->vfs_inode);
664}
665
666static 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
683destroy_attr_tree_cache:
684 hfsplus_destroy_attr_tree_cache();
685
686destroy_inode_cache:
687 kmem_cache_destroy(hfsplus_inode_cachep);
688
689 return err;
690}
691
692static 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
705module_init(init_hfsplus_fs)
706module_exit(exit_hfsplus_fs)