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