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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
180
181
182
183
184
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
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
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
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
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
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
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
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
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 sb->s_d_op = &hfsplus_dentry_operations;
469 sb->s_root = d_make_root(root);
470 if (!sb->s_root) {
471 err = -ENOMEM;
472 goto out_put_alloc_file;
473 }
474
475 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
476 str.name = HFSP_HIDDENDIR_NAME;
477 err = hfs_find_init(sbi->cat_tree, &fd);
478 if (err)
479 goto out_put_root;
480 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
481 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
482 hfs_find_exit(&fd);
483 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
484 goto out_put_root;
485 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
486 if (IS_ERR(inode)) {
487 err = PTR_ERR(inode);
488 goto out_put_root;
489 }
490 sbi->hidden_dir = inode;
491 } else
492 hfs_find_exit(&fd);
493
494 if (!(sb->s_flags & MS_RDONLY)) {
495
496
497
498
499 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
500 vhdr->modify_date = hfsp_now2mt();
501 be32_add_cpu(&vhdr->write_count, 1);
502 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
503 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
504 hfsplus_sync_fs(sb, 1);
505
506 if (!sbi->hidden_dir) {
507 mutex_lock(&sbi->vh_mutex);
508 sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
509 if (!sbi->hidden_dir) {
510 mutex_unlock(&sbi->vh_mutex);
511 err = -ENOMEM;
512 goto out_put_root;
513 }
514 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
515 &str, sbi->hidden_dir);
516 mutex_unlock(&sbi->vh_mutex);
517 if (err)
518 goto out_put_hidden_dir;
519
520 hfsplus_mark_inode_dirty(sbi->hidden_dir,
521 HFSPLUS_I_CAT_DIRTY);
522 }
523 }
524
525 unload_nls(sbi->nls);
526 sbi->nls = nls;
527 return 0;
528
529out_put_hidden_dir:
530 iput(sbi->hidden_dir);
531out_put_root:
532 dput(sb->s_root);
533 sb->s_root = NULL;
534out_put_alloc_file:
535 iput(sbi->alloc_file);
536out_close_cat_tree:
537 hfs_btree_close(sbi->cat_tree);
538out_close_ext_tree:
539 hfs_btree_close(sbi->ext_tree);
540out_free_vhdr:
541 kfree(sbi->s_vhdr_buf);
542 kfree(sbi->s_backup_vhdr_buf);
543out_unload_nls:
544 unload_nls(sbi->nls);
545 unload_nls(nls);
546 kfree(sbi);
547out:
548 return err;
549}
550
551MODULE_AUTHOR("Brad Boyer");
552MODULE_DESCRIPTION("Extended Macintosh Filesystem");
553MODULE_LICENSE("GPL");
554
555static struct kmem_cache *hfsplus_inode_cachep;
556
557static struct inode *hfsplus_alloc_inode(struct super_block *sb)
558{
559 struct hfsplus_inode_info *i;
560
561 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
562 return i ? &i->vfs_inode : NULL;
563}
564
565static void hfsplus_i_callback(struct rcu_head *head)
566{
567 struct inode *inode = container_of(head, struct inode, i_rcu);
568
569 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
570}
571
572static void hfsplus_destroy_inode(struct inode *inode)
573{
574 call_rcu(&inode->i_rcu, hfsplus_i_callback);
575}
576
577#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
578
579static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
580 int flags, const char *dev_name, void *data)
581{
582 return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
583}
584
585static struct file_system_type hfsplus_fs_type = {
586 .owner = THIS_MODULE,
587 .name = "hfsplus",
588 .mount = hfsplus_mount,
589 .kill_sb = kill_block_super,
590 .fs_flags = FS_REQUIRES_DEV,
591};
592
593static void hfsplus_init_once(void *p)
594{
595 struct hfsplus_inode_info *i = p;
596
597 inode_init_once(&i->vfs_inode);
598}
599
600static int __init init_hfsplus_fs(void)
601{
602 int err;
603
604 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
605 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
606 hfsplus_init_once);
607 if (!hfsplus_inode_cachep)
608 return -ENOMEM;
609 err = register_filesystem(&hfsplus_fs_type);
610 if (err)
611 kmem_cache_destroy(hfsplus_inode_cachep);
612 return err;
613}
614
615static void __exit exit_hfsplus_fs(void)
616{
617 unregister_filesystem(&hfsplus_fs_type);
618 kmem_cache_destroy(hfsplus_inode_cachep);
619}
620
621module_init(init_hfsplus_fs)
622module_exit(exit_hfsplus_fs)
623
