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TOMOYO Linux Cross Reference
Linux/fs/hfsplus/super.c

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  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/backing-dev.h>
 15 #include <linux/fs.h>
 16 #include <linux/slab.h>
 17 #include <linux/vfs.h>
 18 #include <linux/nls.h>
 19 
 20 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
 21 static void hfsplus_destroy_inode(struct inode *inode);
 22 
 23 #include "hfsplus_fs.h"
 24 #include "xattr.h"
 25 
 26 static int hfsplus_system_read_inode(struct inode *inode)
 27 {
 28         struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
 29 
 30         switch (inode->i_ino) {
 31         case HFSPLUS_EXT_CNID:
 32                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
 33                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
 34                 break;
 35         case HFSPLUS_CAT_CNID:
 36                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
 37                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
 38                 break;
 39         case HFSPLUS_ALLOC_CNID:
 40                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
 41                 inode->i_mapping->a_ops = &hfsplus_aops;
 42                 break;
 43         case HFSPLUS_START_CNID:
 44                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
 45                 break;
 46         case HFSPLUS_ATTR_CNID:
 47                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
 48                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
 49                 break;
 50         default:
 51                 return -EIO;
 52         }
 53 
 54         return 0;
 55 }
 56 
 57 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
 58 {
 59         struct hfs_find_data fd;
 60         struct inode *inode;
 61         int err;
 62 
 63         inode = iget_locked(sb, ino);
 64         if (!inode)
 65                 return ERR_PTR(-ENOMEM);
 66         if (!(inode->i_state & I_NEW))
 67                 return inode;
 68 
 69         INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
 70         spin_lock_init(&HFSPLUS_I(inode)->open_dir_lock);
 71         mutex_init(&HFSPLUS_I(inode)->extents_lock);
 72         HFSPLUS_I(inode)->flags = 0;
 73         HFSPLUS_I(inode)->extent_state = 0;
 74         HFSPLUS_I(inode)->rsrc_inode = NULL;
 75         atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
 76 
 77         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
 78             inode->i_ino == HFSPLUS_ROOT_CNID) {
 79                 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
 80                 if (!err) {
 81                         err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
 82                         if (!err)
 83                                 err = hfsplus_cat_read_inode(inode, &fd);
 84                         hfs_find_exit(&fd);
 85                 }
 86         } else {
 87                 err = hfsplus_system_read_inode(inode);
 88         }
 89 
 90         if (err) {
 91                 iget_failed(inode);
 92                 return ERR_PTR(err);
 93         }
 94 
 95         unlock_new_inode(inode);
 96         return inode;
 97 }
 98 
 99 static int hfsplus_system_write_inode(struct inode *inode)
100 {
101         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
102         struct hfsplus_vh *vhdr = sbi->s_vhdr;
103         struct hfsplus_fork_raw *fork;
104         struct hfs_btree *tree = NULL;
105 
106         switch (inode->i_ino) {
107         case HFSPLUS_EXT_CNID:
108                 fork = &vhdr->ext_file;
109                 tree = sbi->ext_tree;
110                 break;
111         case HFSPLUS_CAT_CNID:
112                 fork = &vhdr->cat_file;
113                 tree = sbi->cat_tree;
114                 break;
115         case HFSPLUS_ALLOC_CNID:
116                 fork = &vhdr->alloc_file;
117                 break;
118         case HFSPLUS_START_CNID:
119                 fork = &vhdr->start_file;
120                 break;
121         case HFSPLUS_ATTR_CNID:
122                 fork = &vhdr->attr_file;
123                 tree = sbi->attr_tree;
124                 break;
125         default:
126                 return -EIO;
127         }
128 
129         if (fork->total_size != cpu_to_be64(inode->i_size)) {
130                 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
131                 hfsplus_mark_mdb_dirty(inode->i_sb);
132         }
133         hfsplus_inode_write_fork(inode, fork);
134         if (tree) {
135                 int err = hfs_btree_write(tree);
136 
137                 if (err) {
138                         pr_err("b-tree write err: %d, ino %lu\n",
139                                err, inode->i_ino);
140                         return err;
141                 }
142         }
143         return 0;
144 }
145 
146 static int hfsplus_write_inode(struct inode *inode,
147                 struct writeback_control *wbc)
148 {
149         int err;
150 
151         hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
152 
153         err = hfsplus_ext_write_extent(inode);
154         if (err)
155                 return err;
156 
157         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
158             inode->i_ino == HFSPLUS_ROOT_CNID)
159                 return hfsplus_cat_write_inode(inode);
160         else
161                 return hfsplus_system_write_inode(inode);
162 }
163 
164 static void hfsplus_evict_inode(struct inode *inode)
165 {
166         hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
167         truncate_inode_pages_final(&inode->i_data);
168         clear_inode(inode);
169         if (HFSPLUS_IS_RSRC(inode)) {
170                 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
171                 iput(HFSPLUS_I(inode)->rsrc_inode);
172         }
173 }
174 
175 static int hfsplus_sync_fs(struct super_block *sb, int wait)
176 {
177         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
178         struct hfsplus_vh *vhdr = sbi->s_vhdr;
179         int write_backup = 0;
180         int error, error2;
181 
182         if (!wait)
183                 return 0;
184 
185         hfs_dbg(SUPER, "hfsplus_sync_fs\n");
186 
187         /*
188          * Explicitly write out the special metadata inodes.
189          *
190          * While these special inodes are marked as hashed and written
191          * out peridocically by the flusher threads we redirty them
192          * during writeout of normal inodes, and thus the life lock
193          * prevents us from getting the latest state to disk.
194          */
195         error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
196         error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
197         if (!error)
198                 error = error2;
199         if (sbi->attr_tree) {
200                 error2 =
201                     filemap_write_and_wait(sbi->attr_tree->inode->i_mapping);
202                 if (!error)
203                         error = error2;
204         }
205         error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
206         if (!error)
207                 error = error2;
208 
209         mutex_lock(&sbi->vh_mutex);
210         mutex_lock(&sbi->alloc_mutex);
211         vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
212         vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
213         vhdr->folder_count = cpu_to_be32(sbi->folder_count);
214         vhdr->file_count = cpu_to_be32(sbi->file_count);
215 
216         if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
217                 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
218                 write_backup = 1;
219         }
220 
221         error2 = hfsplus_submit_bio(sb,
222                                    sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
223                                    sbi->s_vhdr_buf, NULL, REQ_OP_WRITE,
224                                    REQ_SYNC);
225         if (!error)
226                 error = error2;
227         if (!write_backup)
228                 goto out;
229 
230         error2 = hfsplus_submit_bio(sb,
231                                   sbi->part_start + sbi->sect_count - 2,
232                                   sbi->s_backup_vhdr_buf, NULL, REQ_OP_WRITE,
233                                   REQ_SYNC);
234         if (!error)
235                 error2 = error;
236 out:
237         mutex_unlock(&sbi->alloc_mutex);
238         mutex_unlock(&sbi->vh_mutex);
239 
240         if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
241                 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
242 
243         return error;
244 }
245 
246 static void delayed_sync_fs(struct work_struct *work)
247 {
248         int err;
249         struct hfsplus_sb_info *sbi;
250 
251         sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
252 
253         spin_lock(&sbi->work_lock);
254         sbi->work_queued = 0;
255         spin_unlock(&sbi->work_lock);
256 
257         err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
258         if (err)
259                 pr_err("delayed sync fs err %d\n", err);
260 }
261 
262 void hfsplus_mark_mdb_dirty(struct super_block *sb)
263 {
264         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
265         unsigned long delay;
266 
267         if (sb->s_flags & MS_RDONLY)
268                 return;
269 
270         spin_lock(&sbi->work_lock);
271         if (!sbi->work_queued) {
272                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
273                 queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
274                 sbi->work_queued = 1;
275         }
276         spin_unlock(&sbi->work_lock);
277 }
278 
279 static void hfsplus_put_super(struct super_block *sb)
280 {
281         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
282 
283         hfs_dbg(SUPER, "hfsplus_put_super\n");
284 
285         cancel_delayed_work_sync(&sbi->sync_work);
286 
287         if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
288                 struct hfsplus_vh *vhdr = sbi->s_vhdr;
289 
290                 vhdr->modify_date = hfsp_now2mt();
291                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
292                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
293 
294                 hfsplus_sync_fs(sb, 1);
295         }
296 
297         hfs_btree_close(sbi->attr_tree);
298         hfs_btree_close(sbi->cat_tree);
299         hfs_btree_close(sbi->ext_tree);
300         iput(sbi->alloc_file);
301         iput(sbi->hidden_dir);
302         kfree(sbi->s_vhdr_buf);
303         kfree(sbi->s_backup_vhdr_buf);
304         unload_nls(sbi->nls);
305         kfree(sb->s_fs_info);
306         sb->s_fs_info = NULL;
307 }
308 
309 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
310 {
311         struct super_block *sb = dentry->d_sb;
312         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
313         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
314 
315         buf->f_type = HFSPLUS_SUPER_MAGIC;
316         buf->f_bsize = sb->s_blocksize;
317         buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
318         buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
319         buf->f_bavail = buf->f_bfree;
320         buf->f_files = 0xFFFFFFFF;
321         buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
322         buf->f_fsid.val[0] = (u32)id;
323         buf->f_fsid.val[1] = (u32)(id >> 32);
324         buf->f_namelen = HFSPLUS_MAX_STRLEN;
325 
326         return 0;
327 }
328 
329 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
330 {
331         sync_filesystem(sb);
332         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
333                 return 0;
334         if (!(*flags & MS_RDONLY)) {
335                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
336                 int force = 0;
337 
338                 if (!hfsplus_parse_options_remount(data, &force))
339                         return -EINVAL;
340 
341                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
342                         pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  leaving read-only.\n");
343                         sb->s_flags |= MS_RDONLY;
344                         *flags |= MS_RDONLY;
345                 } else if (force) {
346                         /* nothing */
347                 } else if (vhdr->attributes &
348                                 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
349                         pr_warn("filesystem is marked locked, leaving read-only.\n");
350                         sb->s_flags |= MS_RDONLY;
351                         *flags |= MS_RDONLY;
352                 } else if (vhdr->attributes &
353                                 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
354                         pr_warn("filesystem is marked journaled, leaving read-only.\n");
355                         sb->s_flags |= MS_RDONLY;
356                         *flags |= MS_RDONLY;
357                 }
358         }
359         return 0;
360 }
361 
362 static const struct super_operations hfsplus_sops = {
363         .alloc_inode    = hfsplus_alloc_inode,
364         .destroy_inode  = hfsplus_destroy_inode,
365         .write_inode    = hfsplus_write_inode,
366         .evict_inode    = hfsplus_evict_inode,
367         .put_super      = hfsplus_put_super,
368         .sync_fs        = hfsplus_sync_fs,
369         .statfs         = hfsplus_statfs,
370         .remount_fs     = hfsplus_remount,
371         .show_options   = hfsplus_show_options,
372 };
373 
374 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
375 {
376         struct hfsplus_vh *vhdr;
377         struct hfsplus_sb_info *sbi;
378         hfsplus_cat_entry entry;
379         struct hfs_find_data fd;
380         struct inode *root, *inode;
381         struct qstr str;
382         struct nls_table *nls = NULL;
383         u64 last_fs_block, last_fs_page;
384         int err;
385 
386         err = -ENOMEM;
387         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
388         if (!sbi)
389                 goto out;
390 
391         sb->s_fs_info = sbi;
392         mutex_init(&sbi->alloc_mutex);
393         mutex_init(&sbi->vh_mutex);
394         spin_lock_init(&sbi->work_lock);
395         INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
396         hfsplus_fill_defaults(sbi);
397 
398         err = -EINVAL;
399         if (!hfsplus_parse_options(data, sbi)) {
400                 pr_err("unable to parse mount options\n");
401                 goto out_unload_nls;
402         }
403 
404         /* temporarily use utf8 to correctly find the hidden dir below */
405         nls = sbi->nls;
406         sbi->nls = load_nls("utf8");
407         if (!sbi->nls) {
408                 pr_err("unable to load nls for utf8\n");
409                 goto out_unload_nls;
410         }
411 
412         /* Grab the volume header */
413         if (hfsplus_read_wrapper(sb)) {
414                 if (!silent)
415                         pr_warn("unable to find HFS+ superblock\n");
416                 goto out_unload_nls;
417         }
418         vhdr = sbi->s_vhdr;
419 
420         /* Copy parts of the volume header into the superblock */
421         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
422         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
423             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
424                 pr_err("wrong filesystem version\n");
425                 goto out_free_vhdr;
426         }
427         sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
428         sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
429         sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
430         sbi->file_count = be32_to_cpu(vhdr->file_count);
431         sbi->folder_count = be32_to_cpu(vhdr->folder_count);
432         sbi->data_clump_blocks =
433                 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
434         if (!sbi->data_clump_blocks)
435                 sbi->data_clump_blocks = 1;
436         sbi->rsrc_clump_blocks =
437                 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
438         if (!sbi->rsrc_clump_blocks)
439                 sbi->rsrc_clump_blocks = 1;
440 
441         err = -EFBIG;
442         last_fs_block = sbi->total_blocks - 1;
443         last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
444                         PAGE_SHIFT;
445 
446         if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
447             (last_fs_page > (pgoff_t)(~0ULL))) {
448                 pr_err("filesystem size too large\n");
449                 goto out_free_vhdr;
450         }
451 
452         /* Set up operations so we can load metadata */
453         sb->s_op = &hfsplus_sops;
454         sb->s_maxbytes = MAX_LFS_FILESIZE;
455 
456         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
457                 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  mounting read-only.\n");
458                 sb->s_flags |= MS_RDONLY;
459         } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
460                 /* nothing */
461         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
462                 pr_warn("Filesystem is marked locked, mounting read-only.\n");
463                 sb->s_flags |= MS_RDONLY;
464         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
465                         !(sb->s_flags & MS_RDONLY)) {
466                 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
467                 sb->s_flags |= MS_RDONLY;
468         }
469 
470         err = -EINVAL;
471 
472         /* Load metadata objects (B*Trees) */
473         sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
474         if (!sbi->ext_tree) {
475                 pr_err("failed to load extents file\n");
476                 goto out_free_vhdr;
477         }
478         sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
479         if (!sbi->cat_tree) {
480                 pr_err("failed to load catalog file\n");
481                 goto out_close_ext_tree;
482         }
483         atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
484         if (vhdr->attr_file.total_blocks != 0) {
485                 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
486                 if (!sbi->attr_tree) {
487                         pr_err("failed to load attributes file\n");
488                         goto out_close_cat_tree;
489                 }
490                 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
491         }
492         sb->s_xattr = hfsplus_xattr_handlers;
493 
494         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
495         if (IS_ERR(inode)) {
496                 pr_err("failed to load allocation file\n");
497                 err = PTR_ERR(inode);
498                 goto out_close_attr_tree;
499         }
500         sbi->alloc_file = inode;
501 
502         /* Load the root directory */
503         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
504         if (IS_ERR(root)) {
505                 pr_err("failed to load root directory\n");
506                 err = PTR_ERR(root);
507                 goto out_put_alloc_file;
508         }
509 
510         sb->s_d_op = &hfsplus_dentry_operations;
511         sb->s_root = d_make_root(root);
512         if (!sb->s_root) {
513                 err = -ENOMEM;
514                 goto out_put_alloc_file;
515         }
516 
517         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
518         str.name = HFSP_HIDDENDIR_NAME;
519         err = hfs_find_init(sbi->cat_tree, &fd);
520         if (err)
521                 goto out_put_root;
522         err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
523         if (unlikely(err < 0))
524                 goto out_put_root;
525         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
526                 hfs_find_exit(&fd);
527                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
528                         goto out_put_root;
529                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
530                 if (IS_ERR(inode)) {
531                         err = PTR_ERR(inode);
532                         goto out_put_root;
533                 }
534                 sbi->hidden_dir = inode;
535         } else
536                 hfs_find_exit(&fd);
537 
538         if (!(sb->s_flags & MS_RDONLY)) {
539                 /*
540                  * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
541                  * all three are registered with Apple for our use
542                  */
543                 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
544                 vhdr->modify_date = hfsp_now2mt();
545                 be32_add_cpu(&vhdr->write_count, 1);
546                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
547                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
548                 hfsplus_sync_fs(sb, 1);
549 
550                 if (!sbi->hidden_dir) {
551                         mutex_lock(&sbi->vh_mutex);
552                         sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
553                         if (!sbi->hidden_dir) {
554                                 mutex_unlock(&sbi->vh_mutex);
555                                 err = -ENOMEM;
556                                 goto out_put_root;
557                         }
558                         err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
559                                                  &str, sbi->hidden_dir);
560                         if (err) {
561                                 mutex_unlock(&sbi->vh_mutex);
562                                 goto out_put_hidden_dir;
563                         }
564 
565                         err = hfsplus_init_inode_security(sbi->hidden_dir,
566                                                                 root, &str);
567                         if (err == -EOPNOTSUPP)
568                                 err = 0; /* Operation is not supported. */
569                         else if (err) {
570                                 /*
571                                  * Try to delete anyway without
572                                  * error analysis.
573                                  */
574                                 hfsplus_delete_cat(sbi->hidden_dir->i_ino,
575                                                         root, &str);
576                                 mutex_unlock(&sbi->vh_mutex);
577                                 goto out_put_hidden_dir;
578                         }
579 
580                         mutex_unlock(&sbi->vh_mutex);
581                         hfsplus_mark_inode_dirty(sbi->hidden_dir,
582                                                  HFSPLUS_I_CAT_DIRTY);
583                 }
584         }
585 
586         unload_nls(sbi->nls);
587         sbi->nls = nls;
588         return 0;
589 
590 out_put_hidden_dir:
591         iput(sbi->hidden_dir);
592 out_put_root:
593         dput(sb->s_root);
594         sb->s_root = NULL;
595 out_put_alloc_file:
596         iput(sbi->alloc_file);
597 out_close_attr_tree:
598         hfs_btree_close(sbi->attr_tree);
599 out_close_cat_tree:
600         hfs_btree_close(sbi->cat_tree);
601 out_close_ext_tree:
602         hfs_btree_close(sbi->ext_tree);
603 out_free_vhdr:
604         kfree(sbi->s_vhdr_buf);
605         kfree(sbi->s_backup_vhdr_buf);
606 out_unload_nls:
607         unload_nls(sbi->nls);
608         unload_nls(nls);
609         kfree(sbi);
610 out:
611         return err;
612 }
613 
614 MODULE_AUTHOR("Brad Boyer");
615 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
616 MODULE_LICENSE("GPL");
617 
618 static struct kmem_cache *hfsplus_inode_cachep;
619 
620 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
621 {
622         struct hfsplus_inode_info *i;
623 
624         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
625         return i ? &i->vfs_inode : NULL;
626 }
627 
628 static void hfsplus_i_callback(struct rcu_head *head)
629 {
630         struct inode *inode = container_of(head, struct inode, i_rcu);
631 
632         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
633 }
634 
635 static void hfsplus_destroy_inode(struct inode *inode)
636 {
637         call_rcu(&inode->i_rcu, hfsplus_i_callback);
638 }
639 
640 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
641 
642 static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
643                           int flags, const char *dev_name, void *data)
644 {
645         return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
646 }
647 
648 static struct file_system_type hfsplus_fs_type = {
649         .owner          = THIS_MODULE,
650         .name           = "hfsplus",
651         .mount          = hfsplus_mount,
652         .kill_sb        = kill_block_super,
653         .fs_flags       = FS_REQUIRES_DEV,
654 };
655 MODULE_ALIAS_FS("hfsplus");
656 
657 static void hfsplus_init_once(void *p)
658 {
659         struct hfsplus_inode_info *i = p;
660 
661         inode_init_once(&i->vfs_inode);
662 }
663 
664 static int __init init_hfsplus_fs(void)
665 {
666         int err;
667 
668         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
669                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
670                 hfsplus_init_once);
671         if (!hfsplus_inode_cachep)
672                 return -ENOMEM;
673         err = hfsplus_create_attr_tree_cache();
674         if (err)
675                 goto destroy_inode_cache;
676         err = register_filesystem(&hfsplus_fs_type);
677         if (err)
678                 goto destroy_attr_tree_cache;
679         return 0;
680 
681 destroy_attr_tree_cache:
682         hfsplus_destroy_attr_tree_cache();
683 
684 destroy_inode_cache:
685         kmem_cache_destroy(hfsplus_inode_cachep);
686 
687         return err;
688 }
689 
690 static void __exit exit_hfsplus_fs(void)
691 {
692         unregister_filesystem(&hfsplus_fs_type);
693 
694         /*
695          * Make sure all delayed rcu free inodes are flushed before we
696          * destroy cache.
697          */
698         rcu_barrier();
699         hfsplus_destroy_attr_tree_cache();
700         kmem_cache_destroy(hfsplus_inode_cachep);
701 }
702 
703 module_init(init_hfsplus_fs)
704 module_exit(exit_hfsplus_fs)
705 

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