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