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Linux/fs/hfsplus/super.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  *  linux/fs/hfsplus/super.c
  4  *
  5  * Copyright (C) 2001
  6  * Brad Boyer (flar@allandria.com)
  7  * (C) 2003 Ardis Technologies <roman@ardistech.com>
  8  *
  9  */
 10 
 11 #include <linux/module.h>
 12 #include <linux/init.h>
 13 #include <linux/pagemap.h>
 14 #include <linux/blkdev.h>
 15 #include <linux/backing-dev.h>
 16 #include <linux/fs.h>
 17 #include <linux/slab.h>
 18 #include <linux/vfs.h>
 19 #include <linux/nls.h>
 20 
 21 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
 22 static void hfsplus_free_inode(struct inode *inode);
 23 
 24 #include "hfsplus_fs.h"
 25 #include "xattr.h"
 26 
 27 static int hfsplus_system_read_inode(struct inode *inode)
 28 {
 29         struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
 30 
 31         switch (inode->i_ino) {
 32         case HFSPLUS_EXT_CNID:
 33                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
 34                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
 35                 break;
 36         case HFSPLUS_CAT_CNID:
 37                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
 38                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
 39                 break;
 40         case HFSPLUS_ALLOC_CNID:
 41                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
 42                 inode->i_mapping->a_ops = &hfsplus_aops;
 43                 break;
 44         case HFSPLUS_START_CNID:
 45                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
 46                 break;
 47         case HFSPLUS_ATTR_CNID:
 48                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
 49                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
 50                 break;
 51         default:
 52                 return -EIO;
 53         }
 54 
 55         return 0;
 56 }
 57 
 58 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
 59 {
 60         struct hfs_find_data fd;
 61         struct inode *inode;
 62         int err;
 63 
 64         inode = iget_locked(sb, ino);
 65         if (!inode)
 66                 return ERR_PTR(-ENOMEM);
 67         if (!(inode->i_state & I_NEW))
 68                 return inode;
 69 
 70         INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
 71         spin_lock_init(&HFSPLUS_I(inode)->open_dir_lock);
 72         mutex_init(&HFSPLUS_I(inode)->extents_lock);
 73         HFSPLUS_I(inode)->flags = 0;
 74         HFSPLUS_I(inode)->extent_state = 0;
 75         HFSPLUS_I(inode)->rsrc_inode = NULL;
 76         atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
 77 
 78         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
 79             inode->i_ino == HFSPLUS_ROOT_CNID) {
 80                 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
 81                 if (!err) {
 82                         err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
 83                         if (!err)
 84                                 err = hfsplus_cat_read_inode(inode, &fd);
 85                         hfs_find_exit(&fd);
 86                 }
 87         } else {
 88                 err = hfsplus_system_read_inode(inode);
 89         }
 90 
 91         if (err) {
 92                 iget_failed(inode);
 93                 return ERR_PTR(err);
 94         }
 95 
 96         unlock_new_inode(inode);
 97         return inode;
 98 }
 99 
100 static int hfsplus_system_write_inode(struct inode *inode)
101 {
102         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
103         struct hfsplus_vh *vhdr = sbi->s_vhdr;
104         struct hfsplus_fork_raw *fork;
105         struct hfs_btree *tree = NULL;
106 
107         switch (inode->i_ino) {
108         case HFSPLUS_EXT_CNID:
109                 fork = &vhdr->ext_file;
110                 tree = sbi->ext_tree;
111                 break;
112         case HFSPLUS_CAT_CNID:
113                 fork = &vhdr->cat_file;
114                 tree = sbi->cat_tree;
115                 break;
116         case HFSPLUS_ALLOC_CNID:
117                 fork = &vhdr->alloc_file;
118                 break;
119         case HFSPLUS_START_CNID:
120                 fork = &vhdr->start_file;
121                 break;
122         case HFSPLUS_ATTR_CNID:
123                 fork = &vhdr->attr_file;
124                 tree = sbi->attr_tree;
125                 break;
126         default:
127                 return -EIO;
128         }
129 
130         if (fork->total_size != cpu_to_be64(inode->i_size)) {
131                 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
132                 hfsplus_mark_mdb_dirty(inode->i_sb);
133         }
134         hfsplus_inode_write_fork(inode, fork);
135         if (tree) {
136                 int err = hfs_btree_write(tree);
137 
138                 if (err) {
139                         pr_err("b-tree write err: %d, ino %lu\n",
140                                err, inode->i_ino);
141                         return err;
142                 }
143         }
144         return 0;
145 }
146 
147 static int hfsplus_write_inode(struct inode *inode,
148                 struct writeback_control *wbc)
149 {
150         int err;
151 
152         hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
153 
154         err = hfsplus_ext_write_extent(inode);
155         if (err)
156                 return err;
157 
158         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
159             inode->i_ino == HFSPLUS_ROOT_CNID)
160                 return hfsplus_cat_write_inode(inode);
161         else
162                 return hfsplus_system_write_inode(inode);
163 }
164 
165 static void hfsplus_evict_inode(struct inode *inode)
166 {
167         hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
168         truncate_inode_pages_final(&inode->i_data);
169         clear_inode(inode);
170         if (HFSPLUS_IS_RSRC(inode)) {
171                 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
172                 iput(HFSPLUS_I(inode)->rsrc_inode);
173         }
174 }
175 
176 static int hfsplus_sync_fs(struct super_block *sb, int wait)
177 {
178         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
179         struct hfsplus_vh *vhdr = sbi->s_vhdr;
180         int write_backup = 0;
181         int error, error2;
182 
183         if (!wait)
184                 return 0;
185 
186         hfs_dbg(SUPER, "hfsplus_sync_fs\n");
187 
188         /*
189          * Explicitly write out the special metadata inodes.
190          *
191          * While these special inodes are marked as hashed and written
192          * out peridocically by the flusher threads we redirty them
193          * during writeout of normal inodes, and thus the life lock
194          * prevents us from getting the latest state to disk.
195          */
196         error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
197         error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
198         if (!error)
199                 error = error2;
200         if (sbi->attr_tree) {
201                 error2 =
202                     filemap_write_and_wait(sbi->attr_tree->inode->i_mapping);
203                 if (!error)
204                         error = error2;
205         }
206         error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
207         if (!error)
208                 error = error2;
209 
210         mutex_lock(&sbi->vh_mutex);
211         mutex_lock(&sbi->alloc_mutex);
212         vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
213         vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
214         vhdr->folder_count = cpu_to_be32(sbi->folder_count);
215         vhdr->file_count = cpu_to_be32(sbi->file_count);
216 
217         if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
218                 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
219                 write_backup = 1;
220         }
221 
222         error2 = hfsplus_submit_bio(sb,
223                                    sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
224                                    sbi->s_vhdr_buf, NULL, REQ_OP_WRITE,
225                                    REQ_SYNC);
226         if (!error)
227                 error = error2;
228         if (!write_backup)
229                 goto out;
230 
231         error2 = hfsplus_submit_bio(sb,
232                                   sbi->part_start + sbi->sect_count - 2,
233                                   sbi->s_backup_vhdr_buf, NULL, REQ_OP_WRITE,
234                                   REQ_SYNC);
235         if (!error)
236                 error2 = error;
237 out:
238         mutex_unlock(&sbi->alloc_mutex);
239         mutex_unlock(&sbi->vh_mutex);
240 
241         if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
242                 blkdev_issue_flush(sb->s_bdev);
243 
244         return error;
245 }
246 
247 static void delayed_sync_fs(struct work_struct *work)
248 {
249         int err;
250         struct hfsplus_sb_info *sbi;
251 
252         sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
253 
254         spin_lock(&sbi->work_lock);
255         sbi->work_queued = 0;
256         spin_unlock(&sbi->work_lock);
257 
258         err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
259         if (err)
260                 pr_err("delayed sync fs err %d\n", err);
261 }
262 
263 void hfsplus_mark_mdb_dirty(struct super_block *sb)
264 {
265         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
266         unsigned long delay;
267 
268         if (sb_rdonly(sb))
269                 return;
270 
271         spin_lock(&sbi->work_lock);
272         if (!sbi->work_queued) {
273                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
274                 queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
275                 sbi->work_queued = 1;
276         }
277         spin_unlock(&sbi->work_lock);
278 }
279 
280 static void hfsplus_put_super(struct super_block *sb)
281 {
282         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
283 
284         hfs_dbg(SUPER, "hfsplus_put_super\n");
285 
286         cancel_delayed_work_sync(&sbi->sync_work);
287 
288         if (!sb_rdonly(sb) && sbi->s_vhdr) {
289                 struct hfsplus_vh *vhdr = sbi->s_vhdr;
290 
291                 vhdr->modify_date = hfsp_now2mt();
292                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
293                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
294 
295                 hfsplus_sync_fs(sb, 1);
296         }
297 
298         hfs_btree_close(sbi->attr_tree);
299         hfs_btree_close(sbi->cat_tree);
300         hfs_btree_close(sbi->ext_tree);
301         iput(sbi->alloc_file);
302         iput(sbi->hidden_dir);
303         kfree(sbi->s_vhdr_buf);
304         kfree(sbi->s_backup_vhdr_buf);
305         unload_nls(sbi->nls);
306         kfree(sb->s_fs_info);
307         sb->s_fs_info = NULL;
308 }
309 
310 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
311 {
312         struct super_block *sb = dentry->d_sb;
313         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
314         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
315 
316         buf->f_type = HFSPLUS_SUPER_MAGIC;
317         buf->f_bsize = sb->s_blocksize;
318         buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
319         buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
320         buf->f_bavail = buf->f_bfree;
321         buf->f_files = 0xFFFFFFFF;
322         buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
323         buf->f_fsid = u64_to_fsid(id);
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 ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
333                 return 0;
334         if (!(*flags & SB_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 |= SB_RDONLY;
344                         *flags |= SB_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 |= SB_RDONLY;
351                         *flags |= SB_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 |= SB_RDONLY;
356                         *flags |= SB_RDONLY;
357                 }
358         }
359         return 0;
360 }
361 
362 static const struct super_operations hfsplus_sops = {
363         .alloc_inode    = hfsplus_alloc_inode,
364         .free_inode     = hfsplus_free_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 |= SB_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 |= SB_RDONLY;
464         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
465                         !sb_rdonly(sb)) {
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 |= SB_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                         err = -EINVAL;
529                         goto out_put_root;
530                 }
531                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
532                 if (IS_ERR(inode)) {
533                         err = PTR_ERR(inode);
534                         goto out_put_root;
535                 }
536                 sbi->hidden_dir = inode;
537         } else
538                 hfs_find_exit(&fd);
539 
540         if (!sb_rdonly(sb)) {
541                 /*
542                  * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
543                  * all three are registered with Apple for our use
544                  */
545                 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
546                 vhdr->modify_date = hfsp_now2mt();
547                 be32_add_cpu(&vhdr->write_count, 1);
548                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
549                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
550                 hfsplus_sync_fs(sb, 1);
551 
552                 if (!sbi->hidden_dir) {
553                         mutex_lock(&sbi->vh_mutex);
554                         sbi->hidden_dir = hfsplus_new_inode(sb, root, S_IFDIR);
555                         if (!sbi->hidden_dir) {
556                                 mutex_unlock(&sbi->vh_mutex);
557                                 err = -ENOMEM;
558                                 goto out_put_root;
559                         }
560                         err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
561                                                  &str, sbi->hidden_dir);
562                         if (err) {
563                                 mutex_unlock(&sbi->vh_mutex);
564                                 goto out_put_hidden_dir;
565                         }
566 
567                         err = hfsplus_init_security(sbi->hidden_dir,
568                                                         root, &str);
569                         if (err == -EOPNOTSUPP)
570                                 err = 0; /* Operation is not supported. */
571                         else if (err) {
572                                 /*
573                                  * Try to delete anyway without
574                                  * error analysis.
575                                  */
576                                 hfsplus_delete_cat(sbi->hidden_dir->i_ino,
577                                                         root, &str);
578                                 mutex_unlock(&sbi->vh_mutex);
579                                 goto out_put_hidden_dir;
580                         }
581 
582                         mutex_unlock(&sbi->vh_mutex);
583                         hfsplus_mark_inode_dirty(sbi->hidden_dir,
584                                                  HFSPLUS_I_CAT_DIRTY);
585                 }
586         }
587 
588         unload_nls(sbi->nls);
589         sbi->nls = nls;
590         return 0;
591 
592 out_put_hidden_dir:
593         cancel_delayed_work_sync(&sbi->sync_work);
594         iput(sbi->hidden_dir);
595 out_put_root:
596         dput(sb->s_root);
597         sb->s_root = NULL;
598 out_put_alloc_file:
599         iput(sbi->alloc_file);
600 out_close_attr_tree:
601         hfs_btree_close(sbi->attr_tree);
602 out_close_cat_tree:
603         hfs_btree_close(sbi->cat_tree);
604 out_close_ext_tree:
605         hfs_btree_close(sbi->ext_tree);
606 out_free_vhdr:
607         kfree(sbi->s_vhdr_buf);
608         kfree(sbi->s_backup_vhdr_buf);
609 out_unload_nls:
610         unload_nls(sbi->nls);
611         unload_nls(nls);
612         kfree(sbi);
613 out:
614         return err;
615 }
616 
617 MODULE_AUTHOR("Brad Boyer");
618 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
619 MODULE_LICENSE("GPL");
620 
621 static struct kmem_cache *hfsplus_inode_cachep;
622 
623 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
624 {
625         struct hfsplus_inode_info *i;
626 
627         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
628         return i ? &i->vfs_inode : NULL;
629 }
630 
631 static void hfsplus_free_inode(struct inode *inode)
632 {
633         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
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|SLAB_ACCOUNT,
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)
701 

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