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