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_fs_info)
 212                 return;
 213         if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
 214                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 215
 216                 vhdr->modify_date = hfsp_now2mt();
 217                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 218                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 219                 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 220                 ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
 221                 wait_on_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 };
 281
 282 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 283 {
 284         struct hfsplus_vh *vhdr;
 285         struct hfsplus_sb_info *sbi;
 286         hfsplus_cat_entry entry;
 287         struct hfs_find_data fd;
 288         struct inode *root;
 289         struct qstr str;
 290         struct nls_table *nls = NULL;
 291         int err = -EINVAL;
 292
 293         sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
 294         if (!sbi)
 295                 return -ENOMEM;
 296
 297         memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
 298         sb->s_fs_info = sbi;
 299         INIT_HLIST_HEAD(&sbi->rsrc_inodes);
 300         fill_defaults(sbi);
 301         if (!parse_options(data, sbi)) {
 302                 if (!silent)
 303                         printk("HFS+-fs: unable to parse mount options\n");
 304                 err = -EINVAL;
 305                 goto cleanup;
 306         }
 307
 308         /* temporarily use utf8 to correctly find the hidden dir below */
 309         nls = sbi->nls;
 310         sbi->nls = load_nls("utf8");
 311         if (!nls) {
 312                 printk("HFS+: unable to load nls for utf8\n");
 313                 err = -EINVAL;
 314                 goto cleanup;
 315         }
 316
 317         /* Grab the volume header */
 318         if (hfsplus_read_wrapper(sb)) {
 319                 if (!silent)
 320                         printk("HFS+-fs: unable to find HFS+ superblock\n");
 321                 err = -EINVAL;
 322                 goto cleanup;
 323         }
 324         vhdr = HFSPLUS_SB(sb).s_vhdr;
 325
 326         /* Copy parts of the volume header into the superblock */
 327         sb->s_magic = be16_to_cpu(vhdr->signature);
 328         if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) {
 329                 if (!silent)
 330                         printk("HFS+-fs: wrong filesystem version\n");
 331                 goto cleanup;
 332         }
 333         HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
 334         HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
 335         HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
 336         HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
 337         HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
 338         HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
 339         HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 340         if (!HFSPLUS_SB(sb).data_clump_blocks)
 341                 HFSPLUS_SB(sb).data_clump_blocks = 1;
 342         HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 343         if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
 344                 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
 345
 346         /* Set up operations so we can load metadata */
 347         sb->s_op = &hfsplus_sops;
 348         sb->s_maxbytes = MAX_LFS_FILESIZE;
 349
 350         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 351                 if (!silent)
 352                         printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
 353                                "running fsck.hfsplus is recommended.  mounting read-only.\n");
 354                 sb->s_flags |= MS_RDONLY;
 355         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 356                 if (!silent)
 357                         printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
 358                 sb->s_flags |= MS_RDONLY;
 359         }
 360
 361         /* Load metadata objects (B*Trees) */
 362         HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 363         if (!HFSPLUS_SB(sb).ext_tree) {
 364                 if (!silent)
 365                         printk("HFS+-fs: failed to load extents file\n");
 366                 goto cleanup;
 367         }
 368         HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 369         if (!HFSPLUS_SB(sb).cat_tree) {
 370                 if (!silent)
 371                         printk("HFS+-fs: failed to load catalog file\n");
 372                 goto cleanup;
 373         }
 374
 375         HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
 376         if (!HFSPLUS_SB(sb).alloc_file) {
 377                 if (!silent)
 378                         printk("HFS+-fs: failed to load allocation file\n");
 379                 goto cleanup;
 380         }
 381
 382         /* Load the root directory */
 383         root = iget(sb, HFSPLUS_ROOT_CNID);
 384         sb->s_root = d_alloc_root(root);
 385         if (!sb->s_root) {
 386                 if (!silent)
 387                         printk("HFS+-fs: failed to load root directory\n");
 388                 iput(root);
 389                 goto cleanup;
 390         }
 391
 392         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 393         str.name = HFSP_HIDDENDIR_NAME;
 394         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 395         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 396         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 397                 hfs_find_exit(&fd);
 398                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 399                         goto cleanup;
 400                 HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
 401                 if (!HFSPLUS_SB(sb).hidden_dir)
 402                         goto cleanup;
 403         } else
 404                 hfs_find_exit(&fd);
 405
 406         if (sb->s_flags & MS_RDONLY)
 407                 goto out;
 408
 409         /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 410          * all three are registered with Apple for our use
 411          */
 412         vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 413         vhdr->modify_date = hfsp_now2mt();
 414         vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
 415         vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 416         vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 417         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 418         ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
 419         wait_on_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)