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Linux 3.12.28
[linux/fpc-iii.git] / fs / hfsplus / super.c
blob4c4d142cf890a4cb7949467150d9aeb357fd6942
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
19 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
20 static void hfsplus_destroy_inode(struct inode *inode);
21
22 #include "hfsplus_fs.h"
23 #include "xattr.h"
24
25 static int hfsplus_system_read_inode(struct inode *inode)
26 {
27 struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
28
29 switch (inode->i_ino) {
30 case HFSPLUS_EXT_CNID:
31 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
32 inode->i_mapping->a_ops = &hfsplus_btree_aops;
33 break;
34 case HFSPLUS_CAT_CNID:
35 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
36 inode->i_mapping->a_ops = &hfsplus_btree_aops;
37 break;
38 case HFSPLUS_ALLOC_CNID:
39 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
40 inode->i_mapping->a_ops = &hfsplus_aops;
41 break;
42 case HFSPLUS_START_CNID:
43 hfsplus_inode_read_fork(inode, &vhdr->start_file);
44 break;
45 case HFSPLUS_ATTR_CNID:
46 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
47 inode->i_mapping->a_ops = &hfsplus_btree_aops;
48 break;
49 default:
50 return -EIO;
51 }
52
53 return 0;
54 }
55
56 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
57 {
58 struct hfs_find_data fd;
59 struct inode *inode;
60 int err;
61
62 inode = iget_locked(sb, ino);
63 if (!inode)
64 return ERR_PTR(-ENOMEM);
65 if (!(inode->i_state & I_NEW))
66 return inode;
67
68 INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
69 mutex_init(&HFSPLUS_I(inode)->extents_lock);
70 HFSPLUS_I(inode)->flags = 0;
71 HFSPLUS_I(inode)->extent_state = 0;
72 HFSPLUS_I(inode)->rsrc_inode = NULL;
73 atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
74
75 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
76 inode->i_ino == HFSPLUS_ROOT_CNID) {
77 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
78 if (!err) {
79 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
80 if (!err)
81 err = hfsplus_cat_read_inode(inode, &fd);
82 hfs_find_exit(&fd);
83 }
84 } else {
85 err = hfsplus_system_read_inode(inode);
86 }
87
88 if (err) {
89 iget_failed(inode);
90 return ERR_PTR(err);
91 }
92
93 unlock_new_inode(inode);
94 return inode;
95 }
96
97 static int hfsplus_system_write_inode(struct inode *inode)
98 {
99 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
100 struct hfsplus_vh *vhdr = sbi->s_vhdr;
101 struct hfsplus_fork_raw *fork;
102 struct hfs_btree *tree = NULL;
103
104 switch (inode->i_ino) {
105 case HFSPLUS_EXT_CNID:
106 fork = &vhdr->ext_file;
107 tree = sbi->ext_tree;
108 break;
109 case HFSPLUS_CAT_CNID:
110 fork = &vhdr->cat_file;
111 tree = sbi->cat_tree;
112 break;
113 case HFSPLUS_ALLOC_CNID:
114 fork = &vhdr->alloc_file;
115 break;
116 case HFSPLUS_START_CNID:
117 fork = &vhdr->start_file;
118 break;
119 case HFSPLUS_ATTR_CNID:
120 fork = &vhdr->attr_file;
121 tree = sbi->attr_tree;
122 break;
123 default:
124 return -EIO;
125 }
126
127 if (fork->total_size != cpu_to_be64(inode->i_size)) {
128 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
129 hfsplus_mark_mdb_dirty(inode->i_sb);
130 }
131 hfsplus_inode_write_fork(inode, fork);
132 if (tree) {
133 int err = hfs_btree_write(tree);
134 if (err) {
135 pr_err("b-tree write err: %d, ino %lu\n",
136 err, inode->i_ino);
137 return err;
138 }
139 }
140 return 0;
141 }
142
143 static int hfsplus_write_inode(struct inode *inode,
144 struct writeback_control *wbc)
145 {
146 int err;
147
148 hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
149
150 err = hfsplus_ext_write_extent(inode);
151 if (err)
152 return err;
153
154 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
155 inode->i_ino == HFSPLUS_ROOT_CNID)
156 return hfsplus_cat_write_inode(inode);
157 else
158 return hfsplus_system_write_inode(inode);
159 }
160
161 static void hfsplus_evict_inode(struct inode *inode)
162 {
163 hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
164 truncate_inode_pages(&inode->i_data, 0);
165 clear_inode(inode);
166 if (HFSPLUS_IS_RSRC(inode)) {
167 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
168 iput(HFSPLUS_I(inode)->rsrc_inode);
169 }
170 }
171
172 static int hfsplus_sync_fs(struct super_block *sb, int wait)
173 {
174 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
175 struct hfsplus_vh *vhdr = sbi->s_vhdr;
176 int write_backup = 0;
177 int error, error2;
178
179 if (!wait)
180 return 0;
181
182 hfs_dbg(SUPER, "hfsplus_sync_fs\n");
183
184 /*
185 * Explicitly write out the special metadata inodes.
186 *
187 * While these special inodes are marked as hashed and written
188 * out peridocically by the flusher threads we redirty them
189 * during writeout of normal inodes, and thus the life lock
190 * prevents us from getting the latest state to disk.
191 */
192 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
193 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
194 if (!error)
195 error = error2;
196 if (sbi->attr_tree) {
197 error2 =
198 filemap_write_and_wait(sbi->attr_tree->inode->i_mapping);
199 if (!error)
200 error = error2;
201 }
202 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
203 if (!error)
204 error = error2;
205
206 mutex_lock(&sbi->vh_mutex);
207 mutex_lock(&sbi->alloc_mutex);
208 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
209 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
210 vhdr->folder_count = cpu_to_be32(sbi->folder_count);
211 vhdr->file_count = cpu_to_be32(sbi->file_count);
212
213 if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
214 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
215 write_backup = 1;
216 }
217
218 error2 = hfsplus_submit_bio(sb,
219 sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
220 sbi->s_vhdr_buf, NULL, WRITE_SYNC);
221 if (!error)
222 error = error2;
223 if (!write_backup)
224 goto out;
225
226 error2 = hfsplus_submit_bio(sb,
227 sbi->part_start + sbi->sect_count - 2,
228 sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC);
229 if (!error)
230 error2 = error;
231 out:
232 mutex_unlock(&sbi->alloc_mutex);
233 mutex_unlock(&sbi->vh_mutex);
234
235 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
236 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
237
238 return error;
239 }
240
241 static void delayed_sync_fs(struct work_struct *work)
242 {
243 int err;
244 struct hfsplus_sb_info *sbi;
245
246 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
247
248 spin_lock(&sbi->work_lock);
249 sbi->work_queued = 0;
250 spin_unlock(&sbi->work_lock);
251
252 err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
253 if (err)
254 pr_err("delayed sync fs err %d\n", err);
255 }
256
257 void hfsplus_mark_mdb_dirty(struct super_block *sb)
258 {
259 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
260 unsigned long delay;
261
262 if (sb->s_flags & MS_RDONLY)
263 return;
264
265 spin_lock(&sbi->work_lock);
266 if (!sbi->work_queued) {
267 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
268 queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
269 sbi->work_queued = 1;
270 }
271 spin_unlock(&sbi->work_lock);
272 }
273
274 static void hfsplus_put_super(struct super_block *sb)
275 {
276 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
277
278 hfs_dbg(SUPER, "hfsplus_put_super\n");
279
280 cancel_delayed_work_sync(&sbi->sync_work);
281
282 if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
283 struct hfsplus_vh *vhdr = sbi->s_vhdr;
284
285 vhdr->modify_date = hfsp_now2mt();
286 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
287 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
288
289 hfsplus_sync_fs(sb, 1);
290 }
291
292 hfs_btree_close(sbi->attr_tree);
293 hfs_btree_close(sbi->cat_tree);
294 hfs_btree_close(sbi->ext_tree);
295 iput(sbi->alloc_file);
296 iput(sbi->hidden_dir);
297 kfree(sbi->s_vhdr_buf);
298 kfree(sbi->s_backup_vhdr_buf);
299 unload_nls(sbi->nls);
300 kfree(sb->s_fs_info);
301 sb->s_fs_info = NULL;
302 }
303
304 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
305 {
306 struct super_block *sb = dentry->d_sb;
307 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
308 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
309
310 buf->f_type = HFSPLUS_SUPER_MAGIC;
311 buf->f_bsize = sb->s_blocksize;
312 buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
313 buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
314 buf->f_bavail = buf->f_bfree;
315 buf->f_files = 0xFFFFFFFF;
316 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
317 buf->f_fsid.val[0] = (u32)id;
318 buf->f_fsid.val[1] = (u32)(id >> 32);
319 buf->f_namelen = HFSPLUS_MAX_STRLEN;
320
321 return 0;
322 }
323
324 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
325 {
326 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
327 return 0;
328 if (!(*flags & MS_RDONLY)) {
329 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
330 int force = 0;
331
332 if (!hfsplus_parse_options_remount(data, &force))
333 return -EINVAL;
334
335 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
336 pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n");
337 sb->s_flags |= MS_RDONLY;
338 *flags |= MS_RDONLY;
339 } else if (force) {
340 /* nothing */
341 } else if (vhdr->attributes &
342 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
343 pr_warn("filesystem is marked locked, leaving read-only.\n");
344 sb->s_flags |= MS_RDONLY;
345 *flags |= MS_RDONLY;
346 } else if (vhdr->attributes &
347 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
348 pr_warn("filesystem is marked journaled, leaving read-only.\n");
349 sb->s_flags |= MS_RDONLY;
350 *flags |= MS_RDONLY;
351 }
352 }
353 return 0;
354 }
355
356 static const struct super_operations hfsplus_sops = {
357 .alloc_inode = hfsplus_alloc_inode,
358 .destroy_inode = hfsplus_destroy_inode,
359 .write_inode = hfsplus_write_inode,
360 .evict_inode = hfsplus_evict_inode,
361 .put_super = hfsplus_put_super,
362 .sync_fs = hfsplus_sync_fs,
363 .statfs = hfsplus_statfs,
364 .remount_fs = hfsplus_remount,
365 .show_options = hfsplus_show_options,
366 };
367
368 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
369 {
370 struct hfsplus_vh *vhdr;
371 struct hfsplus_sb_info *sbi;
372 hfsplus_cat_entry entry;
373 struct hfs_find_data fd;
374 struct inode *root, *inode;
375 struct qstr str;
376 struct nls_table *nls = NULL;
377 u64 last_fs_block, last_fs_page;
378 int err;
379
380 err = -ENOMEM;
381 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
382 if (!sbi)
383 goto out;
384
385 sb->s_fs_info = sbi;
386 mutex_init(&sbi->alloc_mutex);
387 mutex_init(&sbi->vh_mutex);
388 spin_lock_init(&sbi->work_lock);
389 INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
390 hfsplus_fill_defaults(sbi);
391
392 err = -EINVAL;
393 if (!hfsplus_parse_options(data, sbi)) {
394 pr_err("unable to parse mount options\n");
395 goto out_unload_nls;
396 }
397
398 /* temporarily use utf8 to correctly find the hidden dir below */
399 nls = sbi->nls;
400 sbi->nls = load_nls("utf8");
401 if (!sbi->nls) {
402 pr_err("unable to load nls for utf8\n");
403 goto out_unload_nls;
404 }
405
406 /* Grab the volume header */
407 if (hfsplus_read_wrapper(sb)) {
408 if (!silent)
409 pr_warn("unable to find HFS+ superblock\n");
410 goto out_unload_nls;
411 }
412 vhdr = sbi->s_vhdr;
413
414 /* Copy parts of the volume header into the superblock */
415 sb->s_magic = HFSPLUS_VOLHEAD_SIG;
416 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
417 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
418 pr_err("wrong filesystem version\n");
419 goto out_free_vhdr;
420 }
421 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
422 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
423 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
424 sbi->file_count = be32_to_cpu(vhdr->file_count);
425 sbi->folder_count = be32_to_cpu(vhdr->folder_count);
426 sbi->data_clump_blocks =
427 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
428 if (!sbi->data_clump_blocks)
429 sbi->data_clump_blocks = 1;
430 sbi->rsrc_clump_blocks =
431 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
432 if (!sbi->rsrc_clump_blocks)
433 sbi->rsrc_clump_blocks = 1;
434
435 err = -EFBIG;
436 last_fs_block = sbi->total_blocks - 1;
437 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
438 PAGE_CACHE_SHIFT;
439
440 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
441 (last_fs_page > (pgoff_t)(~0ULL))) {
442 pr_err("filesystem size too large\n");
443 goto out_free_vhdr;
444 }
445
446 /* Set up operations so we can load metadata */
447 sb->s_op = &hfsplus_sops;
448 sb->s_maxbytes = MAX_LFS_FILESIZE;
449
450 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
451 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.\n");
452 sb->s_flags |= MS_RDONLY;
453 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
454 /* nothing */
455 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
456 pr_warn("Filesystem is marked locked, mounting read-only.\n");
457 sb->s_flags |= MS_RDONLY;
458 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
459 !(sb->s_flags & MS_RDONLY)) {
460 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
461 sb->s_flags |= MS_RDONLY;
462 }
463
464 err = -EINVAL;
465
466 /* Load metadata objects (B*Trees) */
467 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
468 if (!sbi->ext_tree) {
469 pr_err("failed to load extents file\n");
470 goto out_free_vhdr;
471 }
472 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
473 if (!sbi->cat_tree) {
474 pr_err("failed to load catalog file\n");
475 goto out_close_ext_tree;
476 }
477 if (vhdr->attr_file.total_blocks != 0) {
478 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
479 if (!sbi->attr_tree) {
480 pr_err("failed to load attributes file\n");
481 goto out_close_cat_tree;
482 }
483 }
484 sb->s_xattr = hfsplus_xattr_handlers;
485
486 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
487 if (IS_ERR(inode)) {
488 pr_err("failed to load allocation file\n");
489 err = PTR_ERR(inode);
490 goto out_close_attr_tree;
491 }
492 sbi->alloc_file = inode;
493
494 /* Load the root directory */
495 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
496 if (IS_ERR(root)) {
497 pr_err("failed to load root directory\n");
498 err = PTR_ERR(root);
499 goto out_put_alloc_file;
500 }
501
502 sb->s_d_op = &hfsplus_dentry_operations;
503 sb->s_root = d_make_root(root);
504 if (!sb->s_root) {
505 err = -ENOMEM;
506 goto out_put_alloc_file;
507 }
508
509 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
510 str.name = HFSP_HIDDENDIR_NAME;
511 err = hfs_find_init(sbi->cat_tree, &fd);
512 if (err)
513 goto out_put_root;
514 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
515 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
516 hfs_find_exit(&fd);
517 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
518 goto out_put_root;
519 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
520 if (IS_ERR(inode)) {
521 err = PTR_ERR(inode);
522 goto out_put_root;
523 }
524 sbi->hidden_dir = inode;
525 } else
526 hfs_find_exit(&fd);
527
528 if (!(sb->s_flags & MS_RDONLY)) {
529 /*
530 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
531 * all three are registered with Apple for our use
532 */
533 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
534 vhdr->modify_date = hfsp_now2mt();
535 be32_add_cpu(&vhdr->write_count, 1);
536 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
537 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
538 hfsplus_sync_fs(sb, 1);
539
540 if (!sbi->hidden_dir) {
541 mutex_lock(&sbi->vh_mutex);
542 sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
543 if (!sbi->hidden_dir) {
544 mutex_unlock(&sbi->vh_mutex);
545 err = -ENOMEM;
546 goto out_put_root;
547 }
548 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
549 &str, sbi->hidden_dir);
550 if (err) {
551 mutex_unlock(&sbi->vh_mutex);
552 goto out_put_hidden_dir;
553 }
554
555 err = hfsplus_init_inode_security(sbi->hidden_dir,
556 root, &str);
557 if (err == -EOPNOTSUPP)
558 err = 0; /* Operation is not supported. */
559 else if (err) {
560 /*
561 * Try to delete anyway without
562 * error analysis.
563 */
564 hfsplus_delete_cat(sbi->hidden_dir->i_ino,
565 root, &str);
566 mutex_unlock(&sbi->vh_mutex);
567 goto out_put_hidden_dir;
568 }
569
570 mutex_unlock(&sbi->vh_mutex);
571 hfsplus_mark_inode_dirty(sbi->hidden_dir,
572 HFSPLUS_I_CAT_DIRTY);
573 }
574 }
575
576 unload_nls(sbi->nls);
577 sbi->nls = nls;
578 return 0;
579
580 out_put_hidden_dir:
581 iput(sbi->hidden_dir);
582 out_put_root:
583 dput(sb->s_root);
584 sb->s_root = NULL;
585 out_put_alloc_file:
586 iput(sbi->alloc_file);
587 out_close_attr_tree:
588 hfs_btree_close(sbi->attr_tree);
589 out_close_cat_tree:
590 hfs_btree_close(sbi->cat_tree);
591 out_close_ext_tree:
592 hfs_btree_close(sbi->ext_tree);
593 out_free_vhdr:
594 kfree(sbi->s_vhdr_buf);
595 kfree(sbi->s_backup_vhdr_buf);
596 out_unload_nls:
597 unload_nls(sbi->nls);
598 unload_nls(nls);
599 kfree(sbi);
600 out:
601 return err;
602 }
603
604 MODULE_AUTHOR("Brad Boyer");
605 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
606 MODULE_LICENSE("GPL");
607
608 static struct kmem_cache *hfsplus_inode_cachep;
609
610 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
611 {
612 struct hfsplus_inode_info *i;
613
614 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
615 return i ? &i->vfs_inode : NULL;
616 }
617
618 static void hfsplus_i_callback(struct rcu_head *head)
619 {
620 struct inode *inode = container_of(head, struct inode, i_rcu);
621
622 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
623 }
624
625 static void hfsplus_destroy_inode(struct inode *inode)
626 {
627 call_rcu(&inode->i_rcu, hfsplus_i_callback);
628 }
629
630 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
631
632 static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
633 int flags, const char *dev_name, void *data)
634 {
635 return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
636 }
637
638 static struct file_system_type hfsplus_fs_type = {
639 .owner = THIS_MODULE,
640 .name = "hfsplus",
641 .mount = hfsplus_mount,
642 .kill_sb = kill_block_super,
643 .fs_flags = FS_REQUIRES_DEV,
644 };
645 MODULE_ALIAS_FS("hfsplus");
646
647 static void hfsplus_init_once(void *p)
648 {
649 struct hfsplus_inode_info *i = p;
650
651 inode_init_once(&i->vfs_inode);
652 }
653
654 static int __init init_hfsplus_fs(void)
655 {
656 int err;
657
658 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
659 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
660 hfsplus_init_once);
661 if (!hfsplus_inode_cachep)
662 return -ENOMEM;
663 err = hfsplus_create_attr_tree_cache();
664 if (err)
665 goto destroy_inode_cache;
666 err = register_filesystem(&hfsplus_fs_type);
667 if (err)
668 goto destroy_attr_tree_cache;
669 return 0;
670
671 destroy_attr_tree_cache:
672 hfsplus_destroy_attr_tree_cache();
673
674 destroy_inode_cache:
675 kmem_cache_destroy(hfsplus_inode_cachep);
676
677 return err;
678 }
679
680 static void __exit exit_hfsplus_fs(void)
681 {
682 unregister_filesystem(&hfsplus_fs_type);
683
684 /*
685 * Make sure all delayed rcu free inodes are flushed before we
686 * destroy cache.
687 */
688 rcu_barrier();
689 hfsplus_destroy_attr_tree_cache();
690 kmem_cache_destroy(hfsplus_inode_cachep);
691 }
692
693 module_init(init_hfsplus_fs)
694 module_exit(exit_hfsplus_fs)
Linux with added FPC-III support