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drivers: net: ethernet: cpsw: Add SOC dependency support for cpsw dependent modules
[linux-2.6.git] / fs / hfsplus / super.c
blobfdafb2d71654740776bd1b77931b955da350ecad
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
24 static 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
55 struct 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
96 static 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 hfsplus_mark_mdb_dirty(inode->i_sb);
128 }
129 hfsplus_inode_write_fork(inode, fork);
130 if (tree)
131 hfs_btree_write(tree);
132 return 0;
133 }
134
135 static 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
153 static 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 clear_inode(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
164 static int 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_sync_fs\n");
175
176 /*
177 * Explicitly write out the special metadata inodes.
178 *
179 * While these special inodes are marked as hashed and written
180 * out peridocically by the flusher threads we redirty them
181 * during writeout of normal inodes, and thus the life lock
182 * prevents us from getting the latest state to disk.
183 */
184 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
185 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
186 if (!error)
187 error = error2;
188 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
189 if (!error)
190 error = error2;
191
192 mutex_lock(&sbi->vh_mutex);
193 mutex_lock(&sbi->alloc_mutex);
194 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
195 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
196 vhdr->folder_count = cpu_to_be32(sbi->folder_count);
197 vhdr->file_count = cpu_to_be32(sbi->file_count);
198
199 if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
200 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
201 write_backup = 1;
202 }
203
204 error2 = hfsplus_submit_bio(sb,
205 sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
206 sbi->s_vhdr_buf, NULL, WRITE_SYNC);
207 if (!error)
208 error = error2;
209 if (!write_backup)
210 goto out;
211
212 error2 = hfsplus_submit_bio(sb,
213 sbi->part_start + sbi->sect_count - 2,
214 sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC);
215 if (!error)
216 error2 = error;
217 out:
218 mutex_unlock(&sbi->alloc_mutex);
219 mutex_unlock(&sbi->vh_mutex);
220
221 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
222 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
223
224 return error;
225 }
226
227 static void delayed_sync_fs(struct work_struct *work)
228 {
229 struct hfsplus_sb_info *sbi;
230
231 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
232
233 spin_lock(&sbi->work_lock);
234 sbi->work_queued = 0;
235 spin_unlock(&sbi->work_lock);
236
237 hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
238 }
239
240 void hfsplus_mark_mdb_dirty(struct super_block *sb)
241 {
242 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
243 unsigned long delay;
244
245 if (sb->s_flags & MS_RDONLY)
246 return;
247
248 spin_lock(&sbi->work_lock);
249 if (!sbi->work_queued) {
250 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
251 queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
252 sbi->work_queued = 1;
253 }
254 spin_unlock(&sbi->work_lock);
255 }
256
257 static void hfsplus_put_super(struct super_block *sb)
258 {
259 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
260
261 dprint(DBG_SUPER, "hfsplus_put_super\n");
262
263 cancel_delayed_work_sync(&sbi->sync_work);
264
265 if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
266 struct hfsplus_vh *vhdr = sbi->s_vhdr;
267
268 vhdr->modify_date = hfsp_now2mt();
269 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
270 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
271
272 hfsplus_sync_fs(sb, 1);
273 }
274
275 hfs_btree_close(sbi->cat_tree);
276 hfs_btree_close(sbi->ext_tree);
277 iput(sbi->alloc_file);
278 iput(sbi->hidden_dir);
279 kfree(sbi->s_vhdr_buf);
280 kfree(sbi->s_backup_vhdr_buf);
281 unload_nls(sbi->nls);
282 kfree(sb->s_fs_info);
283 sb->s_fs_info = NULL;
284 }
285
286 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
287 {
288 struct super_block *sb = dentry->d_sb;
289 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
290 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
291
292 buf->f_type = HFSPLUS_SUPER_MAGIC;
293 buf->f_bsize = sb->s_blocksize;
294 buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
295 buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
296 buf->f_bavail = buf->f_bfree;
297 buf->f_files = 0xFFFFFFFF;
298 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
299 buf->f_fsid.val[0] = (u32)id;
300 buf->f_fsid.val[1] = (u32)(id >> 32);
301 buf->f_namelen = HFSPLUS_MAX_STRLEN;
302
303 return 0;
304 }
305
306 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
307 {
308 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
309 return 0;
310 if (!(*flags & MS_RDONLY)) {
311 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
312 int force = 0;
313
314 if (!hfsplus_parse_options_remount(data, &force))
315 return -EINVAL;
316
317 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
318 printk(KERN_WARNING "hfs: filesystem was "
319 "not cleanly unmounted, "
320 "running fsck.hfsplus is recommended. "
321 "leaving read-only.\n");
322 sb->s_flags |= MS_RDONLY;
323 *flags |= MS_RDONLY;
324 } else if (force) {
325 /* nothing */
326 } else if (vhdr->attributes &
327 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
328 printk(KERN_WARNING "hfs: filesystem is marked locked, "
329 "leaving read-only.\n");
330 sb->s_flags |= MS_RDONLY;
331 *flags |= MS_RDONLY;
332 } else if (vhdr->attributes &
333 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
334 printk(KERN_WARNING "hfs: filesystem is "
335 "marked journaled, "
336 "leaving read-only.\n");
337 sb->s_flags |= MS_RDONLY;
338 *flags |= MS_RDONLY;
339 }
340 }
341 return 0;
342 }
343
344 static const struct super_operations hfsplus_sops = {
345 .alloc_inode = hfsplus_alloc_inode,
346 .destroy_inode = hfsplus_destroy_inode,
347 .write_inode = hfsplus_write_inode,
348 .evict_inode = hfsplus_evict_inode,
349 .put_super = hfsplus_put_super,
350 .sync_fs = hfsplus_sync_fs,
351 .statfs = hfsplus_statfs,
352 .remount_fs = hfsplus_remount,
353 .show_options = hfsplus_show_options,
354 };
355
356 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
357 {
358 struct hfsplus_vh *vhdr;
359 struct hfsplus_sb_info *sbi;
360 hfsplus_cat_entry entry;
361 struct hfs_find_data fd;
362 struct inode *root, *inode;
363 struct qstr str;
364 struct nls_table *nls = NULL;
365 u64 last_fs_block, last_fs_page;
366 int err;
367
368 err = -ENOMEM;
369 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
370 if (!sbi)
371 goto out;
372
373 sb->s_fs_info = sbi;
374 mutex_init(&sbi->alloc_mutex);
375 mutex_init(&sbi->vh_mutex);
376 spin_lock_init(&sbi->work_lock);
377 INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
378 hfsplus_fill_defaults(sbi);
379
380 err = -EINVAL;
381 if (!hfsplus_parse_options(data, sbi)) {
382 printk(KERN_ERR "hfs: unable to parse mount options\n");
383 goto out_unload_nls;
384 }
385
386 /* temporarily use utf8 to correctly find the hidden dir below */
387 nls = sbi->nls;
388 sbi->nls = load_nls("utf8");
389 if (!sbi->nls) {
390 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
391 goto out_unload_nls;
392 }
393
394 /* Grab the volume header */
395 if (hfsplus_read_wrapper(sb)) {
396 if (!silent)
397 printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
398 goto out_unload_nls;
399 }
400 vhdr = sbi->s_vhdr;
401
402 /* Copy parts of the volume header into the superblock */
403 sb->s_magic = HFSPLUS_VOLHEAD_SIG;
404 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
405 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
406 printk(KERN_ERR "hfs: wrong filesystem version\n");
407 goto out_free_vhdr;
408 }
409 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
410 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
411 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
412 sbi->file_count = be32_to_cpu(vhdr->file_count);
413 sbi->folder_count = be32_to_cpu(vhdr->folder_count);
414 sbi->data_clump_blocks =
415 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
416 if (!sbi->data_clump_blocks)
417 sbi->data_clump_blocks = 1;
418 sbi->rsrc_clump_blocks =
419 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
420 if (!sbi->rsrc_clump_blocks)
421 sbi->rsrc_clump_blocks = 1;
422
423 err = -EFBIG;
424 last_fs_block = sbi->total_blocks - 1;
425 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
426 PAGE_CACHE_SHIFT;
427
428 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
429 (last_fs_page > (pgoff_t)(~0ULL))) {
430 printk(KERN_ERR "hfs: filesystem size too large.\n");
431 goto out_free_vhdr;
432 }
433
434 /* Set up operations so we can load metadata */
435 sb->s_op = &hfsplus_sops;
436 sb->s_maxbytes = MAX_LFS_FILESIZE;
437
438 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
439 printk(KERN_WARNING "hfs: Filesystem was "
440 "not cleanly unmounted, "
441 "running fsck.hfsplus is recommended. "
442 "mounting read-only.\n");
443 sb->s_flags |= MS_RDONLY;
444 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
445 /* nothing */
446 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
447 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
448 sb->s_flags |= MS_RDONLY;
449 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
450 !(sb->s_flags & MS_RDONLY)) {
451 printk(KERN_WARNING "hfs: write access to "
452 "a journaled filesystem is not supported, "
453 "use the force option at your own risk, "
454 "mounting read-only.\n");
455 sb->s_flags |= MS_RDONLY;
456 }
457
458 err = -EINVAL;
459
460 /* Load metadata objects (B*Trees) */
461 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
462 if (!sbi->ext_tree) {
463 printk(KERN_ERR "hfs: failed to load extents file\n");
464 goto out_free_vhdr;
465 }
466 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
467 if (!sbi->cat_tree) {
468 printk(KERN_ERR "hfs: failed to load catalog file\n");
469 goto out_close_ext_tree;
470 }
471
472 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
473 if (IS_ERR(inode)) {
474 printk(KERN_ERR "hfs: failed to load allocation file\n");
475 err = PTR_ERR(inode);
476 goto out_close_cat_tree;
477 }
478 sbi->alloc_file = inode;
479
480 /* Load the root directory */
481 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
482 if (IS_ERR(root)) {
483 printk(KERN_ERR "hfs: failed to load root directory\n");
484 err = PTR_ERR(root);
485 goto out_put_alloc_file;
486 }
487
488 sb->s_d_op = &hfsplus_dentry_operations;
489 sb->s_root = d_make_root(root);
490 if (!sb->s_root) {
491 err = -ENOMEM;
492 goto out_put_alloc_file;
493 }
494
495 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
496 str.name = HFSP_HIDDENDIR_NAME;
497 err = hfs_find_init(sbi->cat_tree, &fd);
498 if (err)
499 goto out_put_root;
500 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
501 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
502 hfs_find_exit(&fd);
503 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
504 goto out_put_root;
505 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
506 if (IS_ERR(inode)) {
507 err = PTR_ERR(inode);
508 goto out_put_root;
509 }
510 sbi->hidden_dir = inode;
511 } else
512 hfs_find_exit(&fd);
513
514 if (!(sb->s_flags & MS_RDONLY)) {
515 /*
516 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
517 * all three are registered with Apple for our use
518 */
519 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
520 vhdr->modify_date = hfsp_now2mt();
521 be32_add_cpu(&vhdr->write_count, 1);
522 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
523 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
524 hfsplus_sync_fs(sb, 1);
525
526 if (!sbi->hidden_dir) {
527 mutex_lock(&sbi->vh_mutex);
528 sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
529 if (!sbi->hidden_dir) {
530 mutex_unlock(&sbi->vh_mutex);
531 err = -ENOMEM;
532 goto out_put_root;
533 }
534 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
535 &str, sbi->hidden_dir);
536 mutex_unlock(&sbi->vh_mutex);
537 if (err)
538 goto out_put_hidden_dir;
539
540 hfsplus_mark_inode_dirty(sbi->hidden_dir,
541 HFSPLUS_I_CAT_DIRTY);
542 }
543 }
544
545 unload_nls(sbi->nls);
546 sbi->nls = nls;
547 return 0;
548
549 out_put_hidden_dir:
550 iput(sbi->hidden_dir);
551 out_put_root:
552 dput(sb->s_root);
553 sb->s_root = NULL;
554 out_put_alloc_file:
555 iput(sbi->alloc_file);
556 out_close_cat_tree:
557 hfs_btree_close(sbi->cat_tree);
558 out_close_ext_tree:
559 hfs_btree_close(sbi->ext_tree);
560 out_free_vhdr:
561 kfree(sbi->s_vhdr_buf);
562 kfree(sbi->s_backup_vhdr_buf);
563 out_unload_nls:
564 unload_nls(sbi->nls);
565 unload_nls(nls);
566 kfree(sbi);
567 out:
568 return err;
569 }
570
571 MODULE_AUTHOR("Brad Boyer");
572 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
573 MODULE_LICENSE("GPL");
574
575 static struct kmem_cache *hfsplus_inode_cachep;
576
577 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
578 {
579 struct hfsplus_inode_info *i;
580
581 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
582 return i ? &i->vfs_inode : NULL;
583 }
584
585 static void hfsplus_i_callback(struct rcu_head *head)
586 {
587 struct inode *inode = container_of(head, struct inode, i_rcu);
588
589 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
590 }
591
592 static void hfsplus_destroy_inode(struct inode *inode)
593 {
594 call_rcu(&inode->i_rcu, hfsplus_i_callback);
595 }
596
597 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
598
599 static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
600 int flags, const char *dev_name, void *data)
601 {
602 return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
603 }
604
605 static struct file_system_type hfsplus_fs_type = {
606 .owner = THIS_MODULE,
607 .name = "hfsplus",
608 .mount = hfsplus_mount,
609 .kill_sb = kill_block_super,
610 .fs_flags = FS_REQUIRES_DEV,
611 };
612
613 static void hfsplus_init_once(void *p)
614 {
615 struct hfsplus_inode_info *i = p;
616
617 inode_init_once(&i->vfs_inode);
618 }
619
620 static int __init init_hfsplus_fs(void)
621 {
622 int err;
623
624 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
625 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
626 hfsplus_init_once);
627 if (!hfsplus_inode_cachep)
628 return -ENOMEM;
629 err = register_filesystem(&hfsplus_fs_type);
630 if (err)
631 kmem_cache_destroy(hfsplus_inode_cachep);
632 return err;
633 }
634
635 static void __exit exit_hfsplus_fs(void)
636 {
637 unregister_filesystem(&hfsplus_fs_type);
638 kmem_cache_destroy(hfsplus_inode_cachep);
639 }
640
641 module_init(init_hfsplus_fs)
642 module_exit(exit_hfsplus_fs)
Linus' kernel tree