fs/hfsplus/super.c

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