fs/hfsplus/super.c

   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 delayed_free(struct rcu_head *p)
 281 {
 282         struct hfsplus_sb_info *sbi = container_of(p, struct hfsplus_sb_info, rcu);
 283
 284         unload_nls(sbi->nls);
 285         kfree(sbi);
 286 }
 287
 288 static void hfsplus_put_super(struct super_block *sb)
 289 {
 290         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 291
 292         hfs_dbg(SUPER, "hfsplus_put_super\n");
 293
 294         cancel_delayed_work_sync(&sbi->sync_work);
 295
 296         if (!sb_rdonly(sb) && sbi->s_vhdr) {
 297                 struct hfsplus_vh *vhdr = sbi->s_vhdr;
 298
 299                 vhdr->modify_date = hfsp_now2mt();
 300                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 301                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 302
 303                 hfsplus_sync_fs(sb, 1);
 304         }
 305
 306         iput(sbi->alloc_file);
 307         iput(sbi->hidden_dir);
 308         hfs_btree_close(sbi->attr_tree);
 309         hfs_btree_close(sbi->cat_tree);
 310         hfs_btree_close(sbi->ext_tree);
 311         kfree(sbi->s_vhdr_buf);
 312         kfree(sbi->s_backup_vhdr_buf);
 313         call_rcu(&sbi->rcu, delayed_free);
 314 }
 315
 316 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 317 {
 318         struct super_block *sb = dentry->d_sb;
 319         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 320         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 321
 322         buf->f_type = HFSPLUS_SUPER_MAGIC;
 323         buf->f_bsize = sb->s_blocksize;
 324         buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
 325         buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
 326         buf->f_bavail = buf->f_bfree;
 327         buf->f_files = 0xFFFFFFFF;
 328         buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
 329         buf->f_fsid = u64_to_fsid(id);
 330         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 331
 332         return 0;
 333 }
 334
 335 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 336 {
 337         sync_filesystem(sb);
 338         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
 339                 return 0;
 340         if (!(*flags & SB_RDONLY)) {
 341                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
 342                 int force = 0;
 343
 344                 if (!hfsplus_parse_options_remount(data, &force))
 345                         return -EINVAL;
 346
 347                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 348                         pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  leaving read-only.\n");
 349                         sb->s_flags |= SB_RDONLY;
 350                         *flags |= SB_RDONLY;
 351                 } else if (force) {
 352                         /* nothing */
 353                 } else if (vhdr->attributes &
 354                                 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 355                         pr_warn("filesystem is marked locked, leaving read-only.\n");
 356                         sb->s_flags |= SB_RDONLY;
 357                         *flags |= SB_RDONLY;
 358                 } else if (vhdr->attributes &
 359                                 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 360                         pr_warn("filesystem is marked journaled, leaving read-only.\n");
 361                         sb->s_flags |= SB_RDONLY;
 362                         *flags |= SB_RDONLY;
 363                 }
 364         }
 365         return 0;
 366 }
 367
 368 static const struct super_operations hfsplus_sops = {
 369         .alloc_inode    = hfsplus_alloc_inode,
 370         .free_inode     = hfsplus_free_inode,
 371         .write_inode    = hfsplus_write_inode,
 372         .evict_inode    = hfsplus_evict_inode,
 373         .put_super      = hfsplus_put_super,
 374         .sync_fs        = hfsplus_sync_fs,
 375         .statfs         = hfsplus_statfs,
 376         .remount_fs     = hfsplus_remount,
 377         .show_options   = hfsplus_show_options,
 378 };
 379
 380 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 381 {
 382         struct hfsplus_vh *vhdr;
 383         struct hfsplus_sb_info *sbi;
 384         hfsplus_cat_entry entry;
 385         struct hfs_find_data fd;
 386         struct inode *root, *inode;
 387         struct qstr str;
 388         struct nls_table *nls = NULL;
 389         u64 last_fs_block, last_fs_page;
 390         int err;
 391
 392         err = -ENOMEM;
 393         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 394         if (!sbi)
 395                 goto out;
 396
 397         sb->s_fs_info = sbi;
 398         mutex_init(&sbi->alloc_mutex);
 399         mutex_init(&sbi->vh_mutex);
 400         spin_lock_init(&sbi->work_lock);
 401         INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
 402         hfsplus_fill_defaults(sbi);
 403
 404         err = -EINVAL;
 405         if (!hfsplus_parse_options(data, sbi)) {
 406                 pr_err("unable to parse mount options\n");
 407                 goto out_unload_nls;
 408         }
 409
 410         /* temporarily use utf8 to correctly find the hidden dir below */
 411         nls = sbi->nls;
 412         sbi->nls = load_nls("utf8");
 413         if (!sbi->nls) {
 414                 pr_err("unable to load nls for utf8\n");
 415                 goto out_unload_nls;
 416         }
 417
 418         /* Grab the volume header */
 419         if (hfsplus_read_wrapper(sb)) {
 420                 if (!silent)
 421                         pr_warn("unable to find HFS+ superblock\n");
 422                 goto out_unload_nls;
 423         }
 424         vhdr = sbi->s_vhdr;
 425
 426         /* Copy parts of the volume header into the superblock */
 427         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 428         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 429             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 430                 pr_err("wrong filesystem version\n");
 431                 goto out_free_vhdr;
 432         }
 433         sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
 434         sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
 435         sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
 436         sbi->file_count = be32_to_cpu(vhdr->file_count);
 437         sbi->folder_count = be32_to_cpu(vhdr->folder_count);
 438         sbi->data_clump_blocks =
 439                 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
 440         if (!sbi->data_clump_blocks)
 441                 sbi->data_clump_blocks = 1;
 442         sbi->rsrc_clump_blocks =
 443                 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
 444         if (!sbi->rsrc_clump_blocks)
 445                 sbi->rsrc_clump_blocks = 1;
 446
 447         err = -EFBIG;
 448         last_fs_block = sbi->total_blocks - 1;
 449         last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
 450                         PAGE_SHIFT;
 451
 452         if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
 453             (last_fs_page > (pgoff_t)(~0ULL))) {
 454                 pr_err("filesystem size too large\n");
 455                 goto out_free_vhdr;
 456         }
 457
 458         /* Set up operations so we can load metadata */
 459         sb->s_op = &hfsplus_sops;
 460         sb->s_maxbytes = MAX_LFS_FILESIZE;
 461
 462         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 463                 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  mounting read-only.\n");
 464                 sb->s_flags |= SB_RDONLY;
 465         } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
 466                 /* nothing */
 467         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 468                 pr_warn("Filesystem is marked locked, mounting read-only.\n");
 469                 sb->s_flags |= SB_RDONLY;
 470         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
 471                         !sb_rdonly(sb)) {
 472                 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
 473                 sb->s_flags |= SB_RDONLY;
 474         }
 475
 476         err = -EINVAL;
 477
 478         /* Load metadata objects (B*Trees) */
 479         sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 480         if (!sbi->ext_tree) {
 481                 pr_err("failed to load extents file\n");
 482                 goto out_free_vhdr;
 483         }
 484         sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 485         if (!sbi->cat_tree) {
 486                 pr_err("failed to load catalog file\n");
 487                 goto out_close_ext_tree;
 488         }
 489         atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
 490         if (vhdr->attr_file.total_blocks != 0) {
 491                 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
 492                 if (!sbi->attr_tree) {
 493                         pr_err("failed to load attributes file\n");
 494                         goto out_close_cat_tree;
 495                 }
 496                 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
 497         }
 498         sb->s_xattr = hfsplus_xattr_handlers;
 499
 500         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 501         if (IS_ERR(inode)) {
 502                 pr_err("failed to load allocation file\n");
 503                 err = PTR_ERR(inode);
 504                 goto out_close_attr_tree;
 505         }
 506         sbi->alloc_file = inode;
 507
 508         /* Load the root directory */
 509         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 510         if (IS_ERR(root)) {
 511                 pr_err("failed to load root directory\n");
 512                 err = PTR_ERR(root);
 513                 goto out_put_alloc_file;
 514         }
 515
 516         sb->s_d_op = &hfsplus_dentry_operations;
 517         sb->s_root = d_make_root(root);
 518         if (!sb->s_root) {
 519                 err = -ENOMEM;
 520                 goto out_put_alloc_file;
 521         }
 522
 523         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 524         str.name = HFSP_HIDDENDIR_NAME;
 525         err = hfs_find_init(sbi->cat_tree, &fd);
 526         if (err)
 527                 goto out_put_root;
 528         err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 529         if (unlikely(err < 0))
 530                 goto out_put_root;
 531         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 532                 hfs_find_exit(&fd);
 533                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) {
 534                         err = -EINVAL;
 535                         goto out_put_root;
 536                 }
 537                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 538                 if (IS_ERR(inode)) {
 539                         err = PTR_ERR(inode);
 540                         goto out_put_root;
 541                 }
 542                 sbi->hidden_dir = inode;
 543         } else
 544                 hfs_find_exit(&fd);
 545
 546         if (!sb_rdonly(sb)) {
 547                 /*
 548                  * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 549                  * all three are registered with Apple for our use
 550                  */
 551                 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 552                 vhdr->modify_date = hfsp_now2mt();
 553                 be32_add_cpu(&vhdr->write_count, 1);
 554                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 555                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 556                 hfsplus_sync_fs(sb, 1);
 557
 558                 if (!sbi->hidden_dir) {
 559                         mutex_lock(&sbi->vh_mutex);
 560                         sbi->hidden_dir = hfsplus_new_inode(sb, root, S_IFDIR);
 561                         if (!sbi->hidden_dir) {
 562                                 mutex_unlock(&sbi->vh_mutex);
 563                                 err = -ENOMEM;
 564                                 goto out_put_root;
 565                         }
 566                         err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
 567                                                  &str, sbi->hidden_dir);
 568                         if (err) {
 569                                 mutex_unlock(&sbi->vh_mutex);
 570                                 goto out_put_hidden_dir;
 571                         }
 572
 573                         err = hfsplus_init_security(sbi->hidden_dir,
 574                                                         root, &str);
 575                         if (err == -EOPNOTSUPP)
 576                                 err = 0; /* Operation is not supported. */
 577                         else if (err) {
 578                                 /*
 579                                  * Try to delete anyway without
 580                                  * error analysis.
 581                                  */
 582                                 hfsplus_delete_cat(sbi->hidden_dir->i_ino,
 583                                                         root, &str);
 584                                 mutex_unlock(&sbi->vh_mutex);
 585                                 goto out_put_hidden_dir;
 586                         }
 587
 588                         mutex_unlock(&sbi->vh_mutex);
 589                         hfsplus_mark_inode_dirty(sbi->hidden_dir,
 590                                                  HFSPLUS_I_CAT_DIRTY);
 591                 }
 592         }
 593
 594         unload_nls(sbi->nls);
 595         sbi->nls = nls;
 596         return 0;
 597
 598 out_put_hidden_dir:
 599         cancel_delayed_work_sync(&sbi->sync_work);
 600         iput(sbi->hidden_dir);
 601 out_put_root:
 602         dput(sb->s_root);
 603         sb->s_root = NULL;
 604 out_put_alloc_file:
 605         iput(sbi->alloc_file);
 606 out_close_attr_tree:
 607         hfs_btree_close(sbi->attr_tree);
 608 out_close_cat_tree:
 609         hfs_btree_close(sbi->cat_tree);
 610 out_close_ext_tree:
 611         hfs_btree_close(sbi->ext_tree);
 612 out_free_vhdr:
 613         kfree(sbi->s_vhdr_buf);
 614         kfree(sbi->s_backup_vhdr_buf);
 615 out_unload_nls:
 616         unload_nls(sbi->nls);
 617         unload_nls(nls);
 618         kfree(sbi);
 619 out:
 620         return err;
 621 }
 622
 623 MODULE_AUTHOR("Brad Boyer");
 624 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 625 MODULE_LICENSE("GPL");
 626
 627 static struct kmem_cache *hfsplus_inode_cachep;
 628
 629 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 630 {
 631         struct hfsplus_inode_info *i;
 632
 633         i = alloc_inode_sb(sb, hfsplus_inode_cachep, GFP_KERNEL);
 634         return i ? &i->vfs_inode : NULL;
 635 }
 636
 637 static void hfsplus_free_inode(struct inode *inode)
 638 {
 639         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
 640 }
 641
 642 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 643
 644 static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
 645                           int flags, const char *dev_name, void *data)
 646 {
 647         return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
 648 }
 649
 650 static struct file_system_type hfsplus_fs_type = {
 651         .owner          = THIS_MODULE,
 652         .name           = "hfsplus",
 653         .mount          = hfsplus_mount,
 654         .kill_sb        = kill_block_super,
 655         .fs_flags       = FS_REQUIRES_DEV,
 656 };
 657 MODULE_ALIAS_FS("hfsplus");
 658
 659 static void hfsplus_init_once(void *p)
 660 {
 661         struct hfsplus_inode_info *i = p;
 662
 663         inode_init_once(&i->vfs_inode);
 664 }
 665
 666 static int __init init_hfsplus_fs(void)
 667 {
 668         int err;
 669
 670         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 671                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
 672                 hfsplus_init_once);
 673         if (!hfsplus_inode_cachep)
 674                 return -ENOMEM;
 675         err = hfsplus_create_attr_tree_cache();
 676         if (err)
 677                 goto destroy_inode_cache;
 678         err = register_filesystem(&hfsplus_fs_type);
 679         if (err)
 680                 goto destroy_attr_tree_cache;
 681         return 0;
 682
 683 destroy_attr_tree_cache:
 684         hfsplus_destroy_attr_tree_cache();
 685
 686 destroy_inode_cache:
 687         kmem_cache_destroy(hfsplus_inode_cachep);
 688
 689         return err;
 690 }
 691
 692 static void __exit exit_hfsplus_fs(void)
 693 {
 694         unregister_filesystem(&hfsplus_fs_type);
 695
 696         /*
 697          * Make sure all delayed rcu free inodes are flushed before we
 698          * destroy cache.
 699          */
 700         rcu_barrier();
 701         hfsplus_destroy_attr_tree_cache();
 702         kmem_cache_destroy(hfsplus_inode_cachep);
 703 }
 704
 705 module_init(init_hfsplus_fs)
 706 module_exit(exit_hfsplus_fs)