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