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
  20 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
  21 static void hfsplus_destroy_inode(struct inode *inode);
  22
  23 #include "hfsplus_fs.h"
  24
  25 void hfsplus_inode_check(struct super_block *sb)
  26 {
  27 #if 0
  28         u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt);
  29         u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt;
  30
  31         if (cnt <= (last_cnt / 2) ||
  32             cnt >= (last_cnt * 2)) {
  33                 HFSPLUS_SB(sb).last_inode_cnt = cnt;
  34                 printk("inode_check: %u,%u,%u\n", cnt, last_cnt,
  35                         HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0);
  36         }
  37 #endif
  38 }
  39
  40 static void hfsplus_read_inode(struct inode *inode)
  41 {
  42         struct hfs_find_data fd;
  43         struct hfsplus_vh *vhdr;
  44         int err;
  45
  46         atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt);
  47         hfsplus_inode_check(inode->i_sb);
  48         INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
  49         init_MUTEX(&HFSPLUS_I(inode).extents_lock);
  50         HFSPLUS_I(inode).flags = 0;
  51         HFSPLUS_I(inode).rsrc_inode = NULL;
  52
  53         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
  54         read_inode:
  55                 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
  56                 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
  57                 if (!err)
  58                         err = hfsplus_cat_read_inode(inode, &fd);
  59                 hfs_find_exit(&fd);
  60                 if (err)
  61                         goto bad_inode;
  62                 return;
  63         }
  64         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
  65         switch(inode->i_ino) {
  66         case HFSPLUS_ROOT_CNID:
  67                 goto read_inode;
  68         case HFSPLUS_EXT_CNID:
  69                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
  70                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  71                 break;
  72         case HFSPLUS_CAT_CNID:
  73                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
  74                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  75                 break;
  76         case HFSPLUS_ALLOC_CNID:
  77                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
  78                 inode->i_mapping->a_ops = &hfsplus_aops;
  79                 break;
  80         case HFSPLUS_START_CNID:
  81                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
  82                 break;
  83         case HFSPLUS_ATTR_CNID:
  84                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
  85                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  86                 break;
  87         default:
  88                 goto bad_inode;
  89         }
  90
  91         return;
  92
  93  bad_inode:
  94         make_bad_inode(inode);
  95 }
  96
  97 int hfsplus_write_inode(struct inode *inode, int unused)
  98 {
  99         struct hfsplus_vh *vhdr;
 100         int ret = 0;
 101
 102         dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
 103         hfsplus_ext_write_extent(inode);
 104         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
 105                 return hfsplus_cat_write_inode(inode);
 106         }
 107         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
 108         switch (inode->i_ino) {
 109         case HFSPLUS_ROOT_CNID:
 110                 ret = hfsplus_cat_write_inode(inode);
 111                 break;
 112         case HFSPLUS_EXT_CNID:
 113                 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
 114                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 115                         inode->i_sb->s_dirt = 1;
 116                 }
 117                 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
 118                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
 119                 break;
 120         case HFSPLUS_CAT_CNID:
 121                 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
 122                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 123                         inode->i_sb->s_dirt = 1;
 124                 }
 125                 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
 126                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
 127                 break;
 128         case HFSPLUS_ALLOC_CNID:
 129                 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
 130                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 131                         inode->i_sb->s_dirt = 1;
 132                 }
 133                 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
 134                 break;
 135         case HFSPLUS_START_CNID:
 136                 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
 137                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 138                         inode->i_sb->s_dirt = 1;
 139                 }
 140                 hfsplus_inode_write_fork(inode, &vhdr->start_file);
 141                 break;
 142         case HFSPLUS_ATTR_CNID:
 143                 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
 144                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 145                         inode->i_sb->s_dirt = 1;
 146                 }
 147                 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
 148                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
 149                 break;
 150         }
 151         return ret;
 152 }
 153
 154 static void hfsplus_clear_inode(struct inode *inode)
 155 {
 156         dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
 157         atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt);
 158         if (HFSPLUS_IS_RSRC(inode)) {
 159                 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
 160                 iput(HFSPLUS_I(inode).rsrc_inode);
 161         }
 162         hfsplus_inode_check(inode->i_sb);
 163 }
 164
 165 static void hfsplus_write_super(struct super_block *sb)
 166 {
 167         struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 168
 169         dprint(DBG_SUPER, "hfsplus_write_super\n");
 170         sb->s_dirt = 0;
 171         if (sb->s_flags & MS_RDONLY)
 172                 /* warn? */
 173                 return;
 174
 175         vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
 176         vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
 177         vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
 178         vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
 179         vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
 180
 181         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 182         if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
 183                 if (HFSPLUS_SB(sb).sect_count) {
 184                         struct buffer_head *bh;
 185                         u32 block, offset;
 186
 187                         block = HFSPLUS_SB(sb).blockoffset;
 188                         block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
 189                         offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
 190                         printk("backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
 191                                 HFSPLUS_SB(sb).sect_count, block, offset);
 192                         bh = sb_bread(sb, block);
 193                         if (bh) {
 194                                 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
 195                                 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
 196                                         memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
 197                                         mark_buffer_dirty(bh);
 198                                         brelse(bh);
 199                                 } else
 200                                         printk("backup not found!\n");
 201                         }
 202                 }
 203                 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
 204         }
 205 }
 206
 207 static void hfsplus_put_super(struct super_block *sb)
 208 {
 209         dprint(DBG_SUPER, "hfsplus_put_super\n");
 210         if (!(sb->s_flags & MS_RDONLY)) {
 211                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 212
 213                 vhdr->modify_date = hfsp_now2mt();
 214                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 215                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 216                 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 217                 ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
 218                 wait_on_buffer(HFSPLUS_SB(sb).s_vhbh);
 219         }
 220
 221         hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
 222         hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
 223         iput(HFSPLUS_SB(sb).alloc_file);
 224         iput(HFSPLUS_SB(sb).hidden_dir);
 225         brelse(HFSPLUS_SB(sb).s_vhbh);
 226 }
 227
 228 static int hfsplus_statfs(struct super_block *sb, struct kstatfs *buf)
 229 {
 230         buf->f_type = HFSPLUS_SUPER_MAGIC;
 231         buf->f_bsize = sb->s_blocksize;
 232         buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
 233         buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
 234         buf->f_bavail = buf->f_bfree;
 235         buf->f_files = 0xFFFFFFFF;
 236         buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
 237         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 238
 239         return 0;
 240 }
 241
 242 int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 243 {
 244         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 245                 return 0;
 246         if (!(*flags & MS_RDONLY)) {
 247                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 248
 249                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 250                         printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
 251                                "running fsck.hfsplus is recommended.  leaving read-only.\n");
 252                         sb->s_flags |= MS_RDONLY;
 253                         *flags |= MS_RDONLY;
 254                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 255                         printk("HFS+-fs: Filesystem is marked locked, leaving read-only.\n");
 256                         sb->s_flags |= MS_RDONLY;
 257                         *flags |= MS_RDONLY;
 258                 }
 259         }
 260         return 0;
 261 }
 262
 263 static struct super_operations hfsplus_sops = {
 264         .alloc_inode    = hfsplus_alloc_inode,
 265         .destroy_inode  = hfsplus_destroy_inode,
 266         .read_inode     = hfsplus_read_inode,
 267         .write_inode    = hfsplus_write_inode,
 268         .clear_inode    = hfsplus_clear_inode,
 269         .put_super      = hfsplus_put_super,
 270         .write_super    = hfsplus_write_super,
 271         .statfs         = hfsplus_statfs,
 272         .remount_fs     = hfsplus_remount,
 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         int err = -EINVAL;
 284
 285         sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
 286         if (!sbi) {
 287                 err = -ENOMEM;
 288                 goto out2;
 289         }
 290         memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
 291         sb->s_fs_info = sbi;
 292         INIT_HLIST_HEAD(&sbi->rsrc_inodes);
 293         fill_defaults(sbi);
 294         if (!parse_options(data, sbi)) {
 295                 if (!silent)
 296                         printk("HFS+-fs: unable to parse mount options\n");
 297                 err = -EINVAL;
 298                 goto out2;
 299         }
 300
 301         /* Grab the volume header */
 302         if (hfsplus_read_wrapper(sb)) {
 303                 if (!silent)
 304                         printk("HFS+-fs: unable to find HFS+ superblock\n");
 305                 err = -EINVAL;
 306                 goto out2;
 307         }
 308         vhdr = HFSPLUS_SB(sb).s_vhdr;
 309
 310         /* Copy parts of the volume header into the superblock */
 311         sb->s_magic = be16_to_cpu(vhdr->signature);
 312         if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) {
 313                 if (!silent)
 314                         printk("HFS+-fs: wrong filesystem version\n");
 315                 goto cleanup;
 316         }
 317         HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
 318         HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
 319         HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
 320         HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
 321         HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
 322         HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
 323         HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 324         if (!HFSPLUS_SB(sb).data_clump_blocks)
 325                 HFSPLUS_SB(sb).data_clump_blocks = 1;
 326         HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 327         if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
 328                 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
 329
 330         /* Set up operations so we can load metadata */
 331         sb->s_op = &hfsplus_sops;
 332         sb->s_maxbytes = MAX_LFS_FILESIZE;
 333
 334         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 335                 if (!silent)
 336                         printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
 337                                "running fsck.hfsplus is recommended.  mounting read-only.\n");
 338                 sb->s_flags |= MS_RDONLY;
 339         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 340                 if (!silent)
 341                         printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
 342                 sb->s_flags |= MS_RDONLY;
 343         }
 344
 345         /* Load metadata objects (B*Trees) */
 346         HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 347         if (!HFSPLUS_SB(sb).ext_tree) {
 348                 if (!silent)
 349                         printk("HFS+-fs: failed to load extents file\n");
 350                 goto cleanup;
 351         }
 352         HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 353         if (!HFSPLUS_SB(sb).cat_tree) {
 354                 if (!silent)
 355                         printk("HFS+-fs: failed to load catalog file\n");
 356                 goto cleanup;
 357         }
 358
 359         HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
 360         if (!HFSPLUS_SB(sb).alloc_file) {
 361                 if (!silent)
 362                         printk("HFS+-fs: failed to load allocation file\n");
 363                 goto cleanup;
 364         }
 365
 366         /* Load the root directory */
 367         root = iget(sb, HFSPLUS_ROOT_CNID);
 368         sb->s_root = d_alloc_root(root);
 369         if (!sb->s_root) {
 370                 if (!silent)
 371                         printk("HFS+-fs: failed to load root directory\n");
 372                 iput(root);
 373                 goto cleanup;
 374         }
 375
 376         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 377         str.name = HFSP_HIDDENDIR_NAME;
 378         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 379         hfsplus_cat_build_key(fd.search_key, HFSPLUS_ROOT_CNID, &str);
 380         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 381                 hfs_find_exit(&fd);
 382                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 383                         goto cleanup;
 384                 HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
 385                 if (!HFSPLUS_SB(sb).hidden_dir)
 386                         goto cleanup;
 387         } else
 388                 hfs_find_exit(&fd);
 389
 390         if (sb->s_flags & MS_RDONLY)
 391                 goto out;
 392
 393         /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 394          * all three are registered with Apple for our use
 395          */
 396         vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 397         vhdr->modify_date = hfsp_now2mt();
 398         vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
 399         vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 400         vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 401         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 402         ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
 403         wait_on_buffer(HFSPLUS_SB(sb).s_vhbh);
 404
 405         if (!HFSPLUS_SB(sb).hidden_dir) {
 406                 printk("HFS+: create hidden dir...\n");
 407                 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 408                 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
 409                                    &str, HFSPLUS_SB(sb).hidden_dir);
 410                 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
 411         }
 412 out:
 413         return 0;
 414
 415 cleanup:
 416         hfsplus_put_super(sb);
 417 out2:
 418         return err;
 419 }
 420
 421 MODULE_AUTHOR("Brad Boyer");
 422 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 423 MODULE_LICENSE("GPL");
 424
 425 static kmem_cache_t *hfsplus_inode_cachep;
 426
 427 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 428 {
 429         struct hfsplus_inode_info *i;
 430
 431         i = kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL);
 432         return i ? &i->vfs_inode : NULL;
 433 }
 434
 435 static void hfsplus_destroy_inode(struct inode *inode)
 436 {
 437         kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
 438 }
 439
 440 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 441
 442 static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type,
 443                                           int flags, const char *dev_name, void *data)
 444 {
 445         return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
 446 }
 447
 448 static struct file_system_type hfsplus_fs_type = {
 449         .owner          = THIS_MODULE,
 450         .name           = "hfsplus",
 451         .get_sb         = hfsplus_get_sb,
 452         .kill_sb        = kill_block_super,
 453         .fs_flags       = FS_REQUIRES_DEV,
 454 };
 455
 456 static void hfsplus_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
 457 {
 458         struct hfsplus_inode_info *i = p;
 459
 460         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
 461                 inode_init_once(&i->vfs_inode);
 462 }
 463
 464 static int __init init_hfsplus_fs(void)
 465 {
 466         int err;
 467
 468         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 469                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 470                 hfsplus_init_once, NULL);
 471         if (!hfsplus_inode_cachep)
 472                 return -ENOMEM;
 473         err = register_filesystem(&hfsplus_fs_type);
 474         if (err)
 475                 kmem_cache_destroy(hfsplus_inode_cachep);
 476         return err;
 477 }
 478
 479 static void __exit exit_hfsplus_fs(void)
 480 {
 481         unregister_filesystem(&hfsplus_fs_type);
 482         if (kmem_cache_destroy(hfsplus_inode_cachep))
 483                 printk(KERN_INFO "hfsplus_inode_cache: not all structures were freed\n");
 484 }
 485
 486 module_init(init_hfsplus_fs)
 487 module_exit(exit_hfsplus_fs)