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