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fs: take i_mutex during prepare_binprm for set[ug]id executables
[linux/fpc-iii.git] / fs / hfsplus / super.c
blob593af2fdcc2dafec8574caa59d970365aede5239
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
135 if (err) {
136 pr_err("b-tree write err: %d, ino %lu\n",
137 err, inode->i_ino);
138 return err;
139 }
140 }
141 return 0;
142 }
143
144 static int hfsplus_write_inode(struct inode *inode,
145 struct writeback_control *wbc)
146 {
147 int err;
148
149 hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
150
151 err = hfsplus_ext_write_extent(inode);
152 if (err)
153 return err;
154
155 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
156 inode->i_ino == HFSPLUS_ROOT_CNID)
157 return hfsplus_cat_write_inode(inode);
158 else
159 return hfsplus_system_write_inode(inode);
160 }
161
162 static void hfsplus_evict_inode(struct inode *inode)
163 {
164 hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
165 truncate_inode_pages_final(&inode->i_data);
166 clear_inode(inode);
167 if (HFSPLUS_IS_RSRC(inode)) {
168 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
169 iput(HFSPLUS_I(inode)->rsrc_inode);
170 }
171 }
172
173 static int hfsplus_sync_fs(struct super_block *sb, int wait)
174 {
175 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
176 struct hfsplus_vh *vhdr = sbi->s_vhdr;
177 int write_backup = 0;
178 int error, error2;
179
180 if (!wait)
181 return 0;
182
183 hfs_dbg(SUPER, "hfsplus_sync_fs\n");
184
185 /*
186 * Explicitly write out the special metadata inodes.
187 *
188 * While these special inodes are marked as hashed and written
189 * out peridocically by the flusher threads we redirty them
190 * during writeout of normal inodes, and thus the life lock
191 * prevents us from getting the latest state to disk.
192 */
193 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
194 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
195 if (!error)
196 error = error2;
197 if (sbi->attr_tree) {
198 error2 =
199 filemap_write_and_wait(sbi->attr_tree->inode->i_mapping);
200 if (!error)
201 error = error2;
202 }
203 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
204 if (!error)
205 error = error2;
206
207 mutex_lock(&sbi->vh_mutex);
208 mutex_lock(&sbi->alloc_mutex);
209 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
210 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
211 vhdr->folder_count = cpu_to_be32(sbi->folder_count);
212 vhdr->file_count = cpu_to_be32(sbi->file_count);
213
214 if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
215 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
216 write_backup = 1;
217 }
218
219 error2 = hfsplus_submit_bio(sb,
220 sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
221 sbi->s_vhdr_buf, NULL, WRITE_SYNC);
222 if (!error)
223 error = error2;
224 if (!write_backup)
225 goto out;
226
227 error2 = hfsplus_submit_bio(sb,
228 sbi->part_start + sbi->sect_count - 2,
229 sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC);
230 if (!error)
231 error2 = error;
232 out:
233 mutex_unlock(&sbi->alloc_mutex);
234 mutex_unlock(&sbi->vh_mutex);
235
236 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
237 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
238
239 return error;
240 }
241
242 static void delayed_sync_fs(struct work_struct *work)
243 {
244 int err;
245 struct hfsplus_sb_info *sbi;
246
247 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
248
249 spin_lock(&sbi->work_lock);
250 sbi->work_queued = 0;
251 spin_unlock(&sbi->work_lock);
252
253 err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
254 if (err)
255 pr_err("delayed sync fs err %d\n", err);
256 }
257
258 void hfsplus_mark_mdb_dirty(struct super_block *sb)
259 {
260 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
261 unsigned long delay;
262
263 if (sb->s_flags & MS_RDONLY)
264 return;
265
266 spin_lock(&sbi->work_lock);
267 if (!sbi->work_queued) {
268 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
269 queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
270 sbi->work_queued = 1;
271 }
272 spin_unlock(&sbi->work_lock);
273 }
274
275 static void hfsplus_put_super(struct super_block *sb)
276 {
277 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
278
279 hfs_dbg(SUPER, "hfsplus_put_super\n");
280
281 cancel_delayed_work_sync(&sbi->sync_work);
282
283 if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
284 struct hfsplus_vh *vhdr = sbi->s_vhdr;
285
286 vhdr->modify_date = hfsp_now2mt();
287 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
288 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
289
290 hfsplus_sync_fs(sb, 1);
291 }
292
293 hfs_btree_close(sbi->attr_tree);
294 hfs_btree_close(sbi->cat_tree);
295 hfs_btree_close(sbi->ext_tree);
296 iput(sbi->alloc_file);
297 iput(sbi->hidden_dir);
298 kfree(sbi->s_vhdr_buf);
299 kfree(sbi->s_backup_vhdr_buf);
300 unload_nls(sbi->nls);
301 kfree(sb->s_fs_info);
302 sb->s_fs_info = NULL;
303 }
304
305 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
306 {
307 struct super_block *sb = dentry->d_sb;
308 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
309 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
310
311 buf->f_type = HFSPLUS_SUPER_MAGIC;
312 buf->f_bsize = sb->s_blocksize;
313 buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
314 buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
315 buf->f_bavail = buf->f_bfree;
316 buf->f_files = 0xFFFFFFFF;
317 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
318 buf->f_fsid.val[0] = (u32)id;
319 buf->f_fsid.val[1] = (u32)(id >> 32);
320 buf->f_namelen = HFSPLUS_MAX_STRLEN;
321
322 return 0;
323 }
324
325 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
326 {
327 sync_filesystem(sb);
328 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
329 return 0;
330 if (!(*flags & MS_RDONLY)) {
331 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
332 int force = 0;
333
334 if (!hfsplus_parse_options_remount(data, &force))
335 return -EINVAL;
336
337 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
338 pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n");
339 sb->s_flags |= MS_RDONLY;
340 *flags |= MS_RDONLY;
341 } else if (force) {
342 /* nothing */
343 } else if (vhdr->attributes &
344 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
345 pr_warn("filesystem is marked locked, leaving read-only.\n");
346 sb->s_flags |= MS_RDONLY;
347 *flags |= MS_RDONLY;
348 } else if (vhdr->attributes &
349 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
350 pr_warn("filesystem is marked journaled, leaving read-only.\n");
351 sb->s_flags |= MS_RDONLY;
352 *flags |= MS_RDONLY;
353 }
354 }
355 return 0;
356 }
357
358 static const struct super_operations hfsplus_sops = {
359 .alloc_inode = hfsplus_alloc_inode,
360 .destroy_inode = hfsplus_destroy_inode,
361 .write_inode = hfsplus_write_inode,
362 .evict_inode = hfsplus_evict_inode,
363 .put_super = hfsplus_put_super,
364 .sync_fs = hfsplus_sync_fs,
365 .statfs = hfsplus_statfs,
366 .remount_fs = hfsplus_remount,
367 .show_options = hfsplus_show_options,
368 };
369
370 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
371 {
372 struct hfsplus_vh *vhdr;
373 struct hfsplus_sb_info *sbi;
374 hfsplus_cat_entry entry;
375 struct hfs_find_data fd;
376 struct inode *root, *inode;
377 struct qstr str;
378 struct nls_table *nls = NULL;
379 u64 last_fs_block, last_fs_page;
380 int err;
381
382 err = -ENOMEM;
383 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
384 if (!sbi)
385 goto out;
386
387 sb->s_fs_info = sbi;
388 mutex_init(&sbi->alloc_mutex);
389 mutex_init(&sbi->vh_mutex);
390 spin_lock_init(&sbi->work_lock);
391 INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
392 hfsplus_fill_defaults(sbi);
393
394 err = -EINVAL;
395 if (!hfsplus_parse_options(data, sbi)) {
396 pr_err("unable to parse mount options\n");
397 goto out_unload_nls;
398 }
399
400 /* temporarily use utf8 to correctly find the hidden dir below */
401 nls = sbi->nls;
402 sbi->nls = load_nls("utf8");
403 if (!sbi->nls) {
404 pr_err("unable to load nls for utf8\n");
405 goto out_unload_nls;
406 }
407
408 /* Grab the volume header */
409 if (hfsplus_read_wrapper(sb)) {
410 if (!silent)
411 pr_warn("unable to find HFS+ superblock\n");
412 goto out_unload_nls;
413 }
414 vhdr = sbi->s_vhdr;
415
416 /* Copy parts of the volume header into the superblock */
417 sb->s_magic = HFSPLUS_VOLHEAD_SIG;
418 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
419 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
420 pr_err("wrong filesystem version\n");
421 goto out_free_vhdr;
422 }
423 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
424 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
425 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
426 sbi->file_count = be32_to_cpu(vhdr->file_count);
427 sbi->folder_count = be32_to_cpu(vhdr->folder_count);
428 sbi->data_clump_blocks =
429 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
430 if (!sbi->data_clump_blocks)
431 sbi->data_clump_blocks = 1;
432 sbi->rsrc_clump_blocks =
433 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
434 if (!sbi->rsrc_clump_blocks)
435 sbi->rsrc_clump_blocks = 1;
436
437 err = -EFBIG;
438 last_fs_block = sbi->total_blocks - 1;
439 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
440 PAGE_CACHE_SHIFT;
441
442 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
443 (last_fs_page > (pgoff_t)(~0ULL))) {
444 pr_err("filesystem size too large\n");
445 goto out_free_vhdr;
446 }
447
448 /* Set up operations so we can load metadata */
449 sb->s_op = &hfsplus_sops;
450 sb->s_maxbytes = MAX_LFS_FILESIZE;
451
452 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
453 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.\n");
454 sb->s_flags |= MS_RDONLY;
455 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
456 /* nothing */
457 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
458 pr_warn("Filesystem is marked locked, mounting read-only.\n");
459 sb->s_flags |= MS_RDONLY;
460 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
461 !(sb->s_flags & MS_RDONLY)) {
462 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
463 sb->s_flags |= MS_RDONLY;
464 }
465
466 err = -EINVAL;
467
468 /* Load metadata objects (B*Trees) */
469 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
470 if (!sbi->ext_tree) {
471 pr_err("failed to load extents file\n");
472 goto out_free_vhdr;
473 }
474 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
475 if (!sbi->cat_tree) {
476 pr_err("failed to load catalog file\n");
477 goto out_close_ext_tree;
478 }
479 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
480 if (vhdr->attr_file.total_blocks != 0) {
481 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
482 if (!sbi->attr_tree) {
483 pr_err("failed to load attributes file\n");
484 goto out_close_cat_tree;
485 }
486 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
487 }
488 sb->s_xattr = hfsplus_xattr_handlers;
489
490 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
491 if (IS_ERR(inode)) {
492 pr_err("failed to load allocation file\n");
493 err = PTR_ERR(inode);
494 goto out_close_attr_tree;
495 }
496 sbi->alloc_file = inode;
497
498 /* Load the root directory */
499 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
500 if (IS_ERR(root)) {
501 pr_err("failed to load root directory\n");
502 err = PTR_ERR(root);
503 goto out_put_alloc_file;
504 }
505
506 sb->s_d_op = &hfsplus_dentry_operations;
507 sb->s_root = d_make_root(root);
508 if (!sb->s_root) {
509 err = -ENOMEM;
510 goto out_put_alloc_file;
511 }
512
513 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
514 str.name = HFSP_HIDDENDIR_NAME;
515 err = hfs_find_init(sbi->cat_tree, &fd);
516 if (err)
517 goto out_put_root;
518 err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
519 if (unlikely(err < 0))
520 goto out_put_root;
521 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
522 hfs_find_exit(&fd);
523 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
524 goto out_put_root;
525 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
526 if (IS_ERR(inode)) {
527 err = PTR_ERR(inode);
528 goto out_put_root;
529 }
530 sbi->hidden_dir = inode;
531 } else
532 hfs_find_exit(&fd);
533
534 if (!(sb->s_flags & MS_RDONLY)) {
535 /*
536 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
537 * all three are registered with Apple for our use
538 */
539 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
540 vhdr->modify_date = hfsp_now2mt();
541 be32_add_cpu(&vhdr->write_count, 1);
542 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
543 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
544 hfsplus_sync_fs(sb, 1);
545
546 if (!sbi->hidden_dir) {
547 mutex_lock(&sbi->vh_mutex);
548 sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
549 if (!sbi->hidden_dir) {
550 mutex_unlock(&sbi->vh_mutex);
551 err = -ENOMEM;
552 goto out_put_root;
553 }
554 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
555 &str, sbi->hidden_dir);
556 if (err) {
557 mutex_unlock(&sbi->vh_mutex);
558 goto out_put_hidden_dir;
559 }
560
561 err = hfsplus_init_inode_security(sbi->hidden_dir,
562 root, &str);
563 if (err == -EOPNOTSUPP)
564 err = 0; /* Operation is not supported. */
565 else if (err) {
566 /*
567 * Try to delete anyway without
568 * error analysis.
569 */
570 hfsplus_delete_cat(sbi->hidden_dir->i_ino,
571 root, &str);
572 mutex_unlock(&sbi->vh_mutex);
573 goto out_put_hidden_dir;
574 }
575
576 mutex_unlock(&sbi->vh_mutex);
577 hfsplus_mark_inode_dirty(sbi->hidden_dir,
578 HFSPLUS_I_CAT_DIRTY);
579 }
580 }
581
582 unload_nls(sbi->nls);
583 sbi->nls = nls;
584 return 0;
585
586 out_put_hidden_dir:
587 iput(sbi->hidden_dir);
588 out_put_root:
589 dput(sb->s_root);
590 sb->s_root = NULL;
591 out_put_alloc_file:
592 iput(sbi->alloc_file);
593 out_close_attr_tree:
594 hfs_btree_close(sbi->attr_tree);
595 out_close_cat_tree:
596 hfs_btree_close(sbi->cat_tree);
597 out_close_ext_tree:
598 hfs_btree_close(sbi->ext_tree);
599 out_free_vhdr:
600 kfree(sbi->s_vhdr_buf);
601 kfree(sbi->s_backup_vhdr_buf);
602 out_unload_nls:
603 unload_nls(sbi->nls);
604 unload_nls(nls);
605 kfree(sbi);
606 out:
607 return err;
608 }
609
610 MODULE_AUTHOR("Brad Boyer");
611 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
612 MODULE_LICENSE("GPL");
613
614 static struct kmem_cache *hfsplus_inode_cachep;
615
616 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
617 {
618 struct hfsplus_inode_info *i;
619
620 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
621 return i ? &i->vfs_inode : NULL;
622 }
623
624 static void hfsplus_i_callback(struct rcu_head *head)
625 {
626 struct inode *inode = container_of(head, struct inode, i_rcu);
627
628 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
629 }
630
631 static void hfsplus_destroy_inode(struct inode *inode)
632 {
633 call_rcu(&inode->i_rcu, hfsplus_i_callback);
634 }
635
636 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
637
638 static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
639 int flags, const char *dev_name, void *data)
640 {
641 return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
642 }
643
644 static struct file_system_type hfsplus_fs_type = {
645 .owner = THIS_MODULE,
646 .name = "hfsplus",
647 .mount = hfsplus_mount,
648 .kill_sb = kill_block_super,
649 .fs_flags = FS_REQUIRES_DEV,
650 };
651 MODULE_ALIAS_FS("hfsplus");
652
653 static void hfsplus_init_once(void *p)
654 {
655 struct hfsplus_inode_info *i = p;
656
657 inode_init_once(&i->vfs_inode);
658 }
659
660 static int __init init_hfsplus_fs(void)
661 {
662 int err;
663
664 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
665 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
666 hfsplus_init_once);
667 if (!hfsplus_inode_cachep)
668 return -ENOMEM;
669 err = hfsplus_create_attr_tree_cache();
670 if (err)
671 goto destroy_inode_cache;
672 err = register_filesystem(&hfsplus_fs_type);
673 if (err)
674 goto destroy_attr_tree_cache;
675 return 0;
676
677 destroy_attr_tree_cache:
678 hfsplus_destroy_attr_tree_cache();
679
680 destroy_inode_cache:
681 kmem_cache_destroy(hfsplus_inode_cachep);
682
683 return err;
684 }
685
686 static void __exit exit_hfsplus_fs(void)
687 {
688 unregister_filesystem(&hfsplus_fs_type);
689
690 /*
691 * Make sure all delayed rcu free inodes are flushed before we
692 * destroy cache.
693 */
694 rcu_barrier();
695 hfsplus_destroy_attr_tree_cache();
696 kmem_cache_destroy(hfsplus_inode_cachep);
697 }
698
699 module_init(init_hfsplus_fs)
700 module_exit(exit_hfsplus_fs)
Linux with added FPC-III support