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/fs.h>
  14 #include <linux/slab.h>
  15 #include <linux/vfs.h>
  16 #include <linux/nls.h>
  17
  18 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
  19 static void hfsplus_destroy_inode(struct inode *inode);
  20
  21 #include "hfsplus_fs.h"
  22
  23 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
  24 {
  25         struct hfs_find_data fd;
  26         struct hfsplus_vh *vhdr;
  27         struct inode *inode;
  28         long err = -EIO;
  29
  30         inode = iget_locked(sb, ino);
  31         if (!inode)
  32                 return ERR_PTR(-ENOMEM);
  33         if (!(inode->i_state & I_NEW))
  34                 return inode;
  35
  36         INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
  37         mutex_init(&HFSPLUS_I(inode)->extents_lock);
  38         HFSPLUS_I(inode)->flags = 0;
  39         HFSPLUS_I(inode)->rsrc_inode = NULL;
  40         atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
  41
  42         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
  43         read_inode:
  44                 hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
  45                 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
  46                 if (!err)
  47                         err = hfsplus_cat_read_inode(inode, &fd);
  48                 hfs_find_exit(&fd);
  49                 if (err)
  50                         goto bad_inode;
  51                 goto done;
  52         }
  53         vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
  54         switch(inode->i_ino) {
  55         case HFSPLUS_ROOT_CNID:
  56                 goto read_inode;
  57         case HFSPLUS_EXT_CNID:
  58                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
  59                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  60                 break;
  61         case HFSPLUS_CAT_CNID:
  62                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
  63                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  64                 break;
  65         case HFSPLUS_ALLOC_CNID:
  66                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
  67                 inode->i_mapping->a_ops = &hfsplus_aops;
  68                 break;
  69         case HFSPLUS_START_CNID:
  70                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
  71                 break;
  72         case HFSPLUS_ATTR_CNID:
  73                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
  74                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  75                 break;
  76         default:
  77                 goto bad_inode;
  78         }
  79
  80 done:
  81         unlock_new_inode(inode);
  82         return inode;
  83
  84 bad_inode:
  85         iget_failed(inode);
  86         return ERR_PTR(err);
  87 }
  88
  89 static int hfsplus_write_inode(struct inode *inode,
  90                 struct writeback_control *wbc)
  91 {
  92         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
  93         struct hfsplus_vh *vhdr;
  94         int ret = 0;
  95
  96         dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
  97         hfsplus_ext_write_extent(inode);
  98         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
  99                 return hfsplus_cat_write_inode(inode);
 100         }
 101         vhdr = sbi->s_vhdr;
 102         switch (inode->i_ino) {
 103         case HFSPLUS_ROOT_CNID:
 104                 ret = hfsplus_cat_write_inode(inode);
 105                 break;
 106         case HFSPLUS_EXT_CNID:
 107                 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
 108                         sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
 109                         inode->i_sb->s_dirt = 1;
 110                 }
 111                 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
 112                 hfs_btree_write(sbi->ext_tree);
 113                 break;
 114         case HFSPLUS_CAT_CNID:
 115                 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
 116                         sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
 117                         inode->i_sb->s_dirt = 1;
 118                 }
 119                 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
 120                 hfs_btree_write(sbi->cat_tree);
 121                 break;
 122         case HFSPLUS_ALLOC_CNID:
 123                 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
 124                         sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
 125                         inode->i_sb->s_dirt = 1;
 126                 }
 127                 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
 128                 break;
 129         case HFSPLUS_START_CNID:
 130                 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
 131                         sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
 132                         inode->i_sb->s_dirt = 1;
 133                 }
 134                 hfsplus_inode_write_fork(inode, &vhdr->start_file);
 135                 break;
 136         case HFSPLUS_ATTR_CNID:
 137                 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
 138                         sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
 139                         inode->i_sb->s_dirt = 1;
 140                 }
 141                 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
 142                 hfs_btree_write(sbi->attr_tree);
 143                 break;
 144         }
 145         return ret;
 146 }
 147
 148 static void hfsplus_evict_inode(struct inode *inode)
 149 {
 150         dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
 151         truncate_inode_pages(&inode->i_data, 0);
 152         end_writeback(inode);
 153         if (HFSPLUS_IS_RSRC(inode)) {
 154                 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
 155                 iput(HFSPLUS_I(inode)->rsrc_inode);
 156         }
 157 }
 158
 159 int hfsplus_sync_fs(struct super_block *sb, int wait)
 160 {
 161         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 162         struct hfsplus_vh *vhdr = sbi->s_vhdr;
 163
 164         dprint(DBG_SUPER, "hfsplus_write_super\n");
 165
 166         mutex_lock(&sbi->alloc_mutex);
 167         sb->s_dirt = 0;
 168
 169         vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
 170         vhdr->next_alloc = cpu_to_be32(sbi->next_alloc);
 171         vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
 172         vhdr->folder_count = cpu_to_be32(sbi->folder_count);
 173         vhdr->file_count = cpu_to_be32(sbi->file_count);
 174
 175         mark_buffer_dirty(sbi->s_vhbh);
 176         if (sbi->flags & HFSPLUS_SB_WRITEBACKUP) {
 177                 if (sbi->sect_count) {
 178                         struct buffer_head *bh;
 179                         u32 block, offset;
 180
 181                         block = sbi->blockoffset;
 182                         block += (sbi->sect_count - 2) >> (sb->s_blocksize_bits - 9);
 183                         offset = ((sbi->sect_count - 2) << 9) & (sb->s_blocksize - 1);
 184                         printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n",
 185                                           sbi->blockoffset, sbi->sect_count,
 186                                           block, offset);
 187                         bh = sb_bread(sb, block);
 188                         if (bh) {
 189                                 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
 190                                 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
 191                                         memcpy(vhdr, sbi->s_vhdr, sizeof(*vhdr));
 192                                         mark_buffer_dirty(bh);
 193                                         brelse(bh);
 194                                 } else
 195                                         printk(KERN_WARNING "hfs: backup not found!\n");
 196                         }
 197                 }
 198                 sbi->flags &= ~HFSPLUS_SB_WRITEBACKUP;
 199         }
 200         mutex_unlock(&sbi->alloc_mutex);
 201         return 0;
 202 }
 203
 204 static void hfsplus_write_super(struct super_block *sb)
 205 {
 206         if (!(sb->s_flags & MS_RDONLY))
 207                 hfsplus_sync_fs(sb, 1);
 208         else
 209                 sb->s_dirt = 0;
 210 }
 211
 212 static void hfsplus_put_super(struct super_block *sb)
 213 {
 214         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 215
 216         dprint(DBG_SUPER, "hfsplus_put_super\n");
 217
 218         if (!sb->s_fs_info)
 219                 return;
 220
 221         if (sb->s_dirt)
 222                 hfsplus_write_super(sb);
 223         if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
 224                 struct hfsplus_vh *vhdr = sbi->s_vhdr;
 225
 226                 vhdr->modify_date = hfsp_now2mt();
 227                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 228                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 229                 mark_buffer_dirty(sbi->s_vhbh);
 230                 sync_dirty_buffer(sbi->s_vhbh);
 231         }
 232
 233         hfs_btree_close(sbi->cat_tree);
 234         hfs_btree_close(sbi->ext_tree);
 235         iput(sbi->alloc_file);
 236         iput(sbi->hidden_dir);
 237         brelse(sbi->s_vhbh);
 238         unload_nls(sbi->nls);
 239         kfree(sb->s_fs_info);
 240         sb->s_fs_info = NULL;
 241 }
 242
 243 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 244 {
 245         struct super_block *sb = dentry->d_sb;
 246         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 247         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 248
 249         buf->f_type = HFSPLUS_SUPER_MAGIC;
 250         buf->f_bsize = sb->s_blocksize;
 251         buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
 252         buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
 253         buf->f_bavail = buf->f_bfree;
 254         buf->f_files = 0xFFFFFFFF;
 255         buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
 256         buf->f_fsid.val[0] = (u32)id;
 257         buf->f_fsid.val[1] = (u32)(id >> 32);
 258         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 259
 260         return 0;
 261 }
 262
 263 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 264 {
 265         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 266                 return 0;
 267         if (!(*flags & MS_RDONLY)) {
 268                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
 269                 struct hfsplus_sb_info sbi;
 270
 271                 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
 272                 sbi.nls = HFSPLUS_SB(sb)->nls;
 273                 if (!hfsplus_parse_options(data, &sbi))
 274                         return -EINVAL;
 275
 276                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 277                         printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
 278                                "running fsck.hfsplus is recommended.  leaving read-only.\n");
 279                         sb->s_flags |= MS_RDONLY;
 280                         *flags |= MS_RDONLY;
 281                 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
 282                         /* nothing */
 283                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 284                         printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
 285                         sb->s_flags |= MS_RDONLY;
 286                         *flags |= MS_RDONLY;
 287                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 288                         printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
 289                         sb->s_flags |= MS_RDONLY;
 290                         *flags |= MS_RDONLY;
 291                 }
 292         }
 293         return 0;
 294 }
 295
 296 static const struct super_operations hfsplus_sops = {
 297         .alloc_inode    = hfsplus_alloc_inode,
 298         .destroy_inode  = hfsplus_destroy_inode,
 299         .write_inode    = hfsplus_write_inode,
 300         .evict_inode    = hfsplus_evict_inode,
 301         .put_super      = hfsplus_put_super,
 302         .write_super    = hfsplus_write_super,
 303         .sync_fs        = hfsplus_sync_fs,
 304         .statfs         = hfsplus_statfs,
 305         .remount_fs     = hfsplus_remount,
 306         .show_options   = hfsplus_show_options,
 307 };
 308
 309 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 310 {
 311         struct hfsplus_vh *vhdr;
 312         struct hfsplus_sb_info *sbi;
 313         hfsplus_cat_entry entry;
 314         struct hfs_find_data fd;
 315         struct inode *root, *inode;
 316         struct qstr str;
 317         struct nls_table *nls = NULL;
 318         int err = -EINVAL;
 319
 320         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 321         if (!sbi)
 322                 return -ENOMEM;
 323
 324         sb->s_fs_info = sbi;
 325         INIT_HLIST_HEAD(&sbi->rsrc_inodes);
 326         mutex_init(&sbi->alloc_mutex);
 327         hfsplus_fill_defaults(sbi);
 328         if (!hfsplus_parse_options(data, sbi)) {
 329                 printk(KERN_ERR "hfs: unable to parse mount options\n");
 330                 err = -EINVAL;
 331                 goto cleanup;
 332         }
 333
 334         /* temporarily use utf8 to correctly find the hidden dir below */
 335         nls = sbi->nls;
 336         sbi->nls = load_nls("utf8");
 337         if (!sbi->nls) {
 338                 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
 339                 err = -EINVAL;
 340                 goto cleanup;
 341         }
 342
 343         /* Grab the volume header */
 344         if (hfsplus_read_wrapper(sb)) {
 345                 if (!silent)
 346                         printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
 347                 err = -EINVAL;
 348                 goto cleanup;
 349         }
 350         vhdr = sbi->s_vhdr;
 351
 352         /* Copy parts of the volume header into the superblock */
 353         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 354         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 355             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 356                 printk(KERN_ERR "hfs: wrong filesystem version\n");
 357                 goto cleanup;
 358         }
 359         sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
 360         sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
 361         sbi->next_alloc = be32_to_cpu(vhdr->next_alloc);
 362         sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
 363         sbi->file_count = be32_to_cpu(vhdr->file_count);
 364         sbi->folder_count = be32_to_cpu(vhdr->folder_count);
 365         sbi->data_clump_blocks =
 366                 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
 367         if (!sbi->data_clump_blocks)
 368                 sbi->data_clump_blocks = 1;
 369         sbi->rsrc_clump_blocks =
 370                 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
 371         if (!sbi->rsrc_clump_blocks)
 372                 sbi->rsrc_clump_blocks = 1;
 373
 374         /* Set up operations so we can load metadata */
 375         sb->s_op = &hfsplus_sops;
 376         sb->s_maxbytes = MAX_LFS_FILESIZE;
 377
 378         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 379                 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
 380                        "running fsck.hfsplus is recommended.  mounting read-only.\n");
 381                 sb->s_flags |= MS_RDONLY;
 382         } else if (sbi->flags & HFSPLUS_SB_FORCE) {
 383                 /* nothing */
 384         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 385                 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
 386                 sb->s_flags |= MS_RDONLY;
 387         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) {
 388                 printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
 389                        "use the force option at your own risk, mounting read-only.\n");
 390                 sb->s_flags |= MS_RDONLY;
 391         }
 392         sbi->flags &= ~HFSPLUS_SB_FORCE;
 393
 394         /* Load metadata objects (B*Trees) */
 395         sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 396         if (!sbi->ext_tree) {
 397                 printk(KERN_ERR "hfs: failed to load extents file\n");
 398                 goto cleanup;
 399         }
 400         sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 401         if (!sbi->cat_tree) {
 402                 printk(KERN_ERR "hfs: failed to load catalog file\n");
 403                 goto cleanup;
 404         }
 405
 406         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 407         if (IS_ERR(inode)) {
 408                 printk(KERN_ERR "hfs: failed to load allocation file\n");
 409                 err = PTR_ERR(inode);
 410                 goto cleanup;
 411         }
 412         sbi->alloc_file = inode;
 413
 414         /* Load the root directory */
 415         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 416         if (IS_ERR(root)) {
 417                 printk(KERN_ERR "hfs: failed to load root directory\n");
 418                 err = PTR_ERR(root);
 419                 goto cleanup;
 420         }
 421         sb->s_root = d_alloc_root(root);
 422         if (!sb->s_root) {
 423                 iput(root);
 424                 err = -ENOMEM;
 425                 goto cleanup;
 426         }
 427         sb->s_root->d_op = &hfsplus_dentry_operations;
 428
 429         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 430         str.name = HFSP_HIDDENDIR_NAME;
 431         hfs_find_init(sbi->cat_tree, &fd);
 432         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 433         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 434                 hfs_find_exit(&fd);
 435                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 436                         goto cleanup;
 437                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 438                 if (IS_ERR(inode)) {
 439                         err = PTR_ERR(inode);
 440                         goto cleanup;
 441                 }
 442                 sbi->hidden_dir = inode;
 443         } else
 444                 hfs_find_exit(&fd);
 445
 446         if (sb->s_flags & MS_RDONLY)
 447                 goto out;
 448
 449         /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 450          * all three are registered with Apple for our use
 451          */
 452         vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 453         vhdr->modify_date = hfsp_now2mt();
 454         be32_add_cpu(&vhdr->write_count, 1);
 455         vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 456         vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 457         mark_buffer_dirty(sbi->s_vhbh);
 458         sync_dirty_buffer(sbi->s_vhbh);
 459
 460         if (!sbi->hidden_dir) {
 461                 printk(KERN_DEBUG "hfs: create hidden dir...\n");
 462                 sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 463                 hfsplus_create_cat(sbi->hidden_dir->i_ino, sb->s_root->d_inode,
 464                                    &str, sbi->hidden_dir);
 465                 mark_inode_dirty(sbi->hidden_dir);
 466         }
 467 out:
 468         unload_nls(sbi->nls);
 469         sbi->nls = nls;
 470         return 0;
 471
 472 cleanup:
 473         hfsplus_put_super(sb);
 474         unload_nls(nls);
 475         return err;
 476 }
 477
 478 MODULE_AUTHOR("Brad Boyer");
 479 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 480 MODULE_LICENSE("GPL");
 481
 482 static struct kmem_cache *hfsplus_inode_cachep;
 483
 484 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 485 {
 486         struct hfsplus_inode_info *i;
 487
 488         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 489         return i ? &i->vfs_inode : NULL;
 490 }
 491
 492 static void hfsplus_destroy_inode(struct inode *inode)
 493 {
 494         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
 495 }
 496
 497 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 498
 499 static int hfsplus_get_sb(struct file_system_type *fs_type,
 500                           int flags, const char *dev_name, void *data,
 501                           struct vfsmount *mnt)
 502 {
 503         return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
 504                            mnt);
 505 }
 506
 507 static struct file_system_type hfsplus_fs_type = {
 508         .owner          = THIS_MODULE,
 509         .name           = "hfsplus",
 510         .get_sb         = hfsplus_get_sb,
 511         .kill_sb        = kill_block_super,
 512         .fs_flags       = FS_REQUIRES_DEV,
 513 };
 514
 515 static void hfsplus_init_once(void *p)
 516 {
 517         struct hfsplus_inode_info *i = p;
 518
 519         inode_init_once(&i->vfs_inode);
 520 }
 521
 522 static int __init init_hfsplus_fs(void)
 523 {
 524         int err;
 525
 526         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 527                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 528                 hfsplus_init_once);
 529         if (!hfsplus_inode_cachep)
 530                 return -ENOMEM;
 531         err = register_filesystem(&hfsplus_fs_type);
 532         if (err)
 533                 kmem_cache_destroy(hfsplus_inode_cachep);
 534         return err;
 535 }
 536
 537 static void __exit exit_hfsplus_fs(void)
 538 {
 539         unregister_filesystem(&hfsplus_fs_type);
 540         kmem_cache_destroy(hfsplus_inode_cachep);
 541 }
 542
 543 module_init(init_hfsplus_fs)
 544 module_exit(exit_hfsplus_fs)