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