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/fs.h>
  14 #include <linux/sched.h>
  15 #include <linux/slab.h>
  16 #include <linux/version.h>
  17 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
  18 #include <linux/locks.h>
  19 #else
  20 #include <linux/buffer_head.h>
  21 #include <linux/vfs.h>
  22
  23 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
  24 static void hfsplus_destroy_inode(struct inode *inode);
  25 #endif
  26
  27 #include "hfsplus_fs.h"
  28
  29 void hfsplus_inode_check(struct super_block *sb)
  30 {
  31 #if 0
  32         u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt);
  33         u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt;
  34
  35         if (cnt <= (last_cnt / 2) ||
  36             cnt >= (last_cnt * 2)) {
  37                 HFSPLUS_SB(sb).last_inode_cnt = cnt;
  38                 printk("inode_check: %u,%u,%u\n", cnt, last_cnt,
  39                         HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0);
  40         }
  41 #endif
  42 }
  43
  44 static void hfsplus_read_inode(struct inode *inode)
  45 {
  46         struct hfsplus_find_data fd;
  47         struct hfsplus_vh *vhdr;
  48         int err;
  49
  50         atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt);
  51         hfsplus_inode_check(inode->i_sb);
  52         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
  53         read_inode:
  54                 HFSPLUS_I(inode).flags = 0;
  55                 hfsplus_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                 hfsplus_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                 break;
  79         case HFSPLUS_START_CNID:
  80                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
  81                 break;
  82         case HFSPLUS_ATTR_CNID:
  83                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
  84                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  85                 break;
  86         default:
  87                 goto bad_inode;
  88         }
  89
  90         return;
  91
  92  bad_inode:
  93         make_bad_inode(inode);
  94 }
  95
  96 void hfsplus_write_inode(struct inode *inode, int unused)
  97 {
  98         struct hfsplus_vh *vhdr;
  99
 100         dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
 101         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
 102                 hfsplus_cat_write_inode(inode);
 103                 return;
 104         }
 105         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
 106         switch (inode->i_ino) {
 107         case HFSPLUS_ROOT_CNID:
 108                 hfsplus_cat_write_inode(inode);
 109                 break;
 110         case HFSPLUS_EXT_CNID:
 111                 if (vhdr->ext_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->ext_file);
 116                 hfsplus_write_btree(HFSPLUS_SB(inode->i_sb).ext_tree);
 117                 break;
 118         case HFSPLUS_CAT_CNID:
 119                 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
 120                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 121                         inode->i_sb->s_dirt = 1;
 122                 }
 123                 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
 124                 hfsplus_write_btree(HFSPLUS_SB(inode->i_sb).cat_tree);
 125                 break;
 126         case HFSPLUS_ALLOC_CNID:
 127                 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
 128                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 129                         inode->i_sb->s_dirt = 1;
 130                 }
 131                 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
 132                 break;
 133         case HFSPLUS_START_CNID:
 134                 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
 135                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 136                         inode->i_sb->s_dirt = 1;
 137                 }
 138                 hfsplus_inode_write_fork(inode, &vhdr->start_file);
 139                 break;
 140         case HFSPLUS_ATTR_CNID:
 141                 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
 142                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 143                         inode->i_sb->s_dirt = 1;
 144                 }
 145                 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
 146                 hfsplus_write_btree(HFSPLUS_SB(inode->i_sb).attr_tree);
 147                 break;
 148         }
 149 }
 150
 151 static void hfsplus_clear_inode(struct inode *inode)
 152 {
 153         atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt);
 154         if (HFSPLUS_IS_RSRC(inode)) {
 155                 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
 156                 iput(HFSPLUS_I(inode).rsrc_inode);
 157         }
 158         hfsplus_inode_check(inode->i_sb);
 159 }
 160
 161 static void hfsplus_write_super(struct super_block *sb)
 162 {
 163         struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 164
 165         dprint(DBG_SUPER, "hfsplus_write_super\n");
 166         sb->s_dirt = 0;
 167         if (sb->s_flags & MS_RDONLY)
 168                 /* warn? */
 169                 return;
 170
 171         vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
 172         vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
 173         vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
 174         vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
 175         vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
 176
 177         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 178         if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
 179                 if (HFSPLUS_SB(sb).sect_count) {
 180                         struct buffer_head *bh;
 181                         u32 block, offset;
 182
 183                         block = HFSPLUS_SB(sb).blockoffset;
 184                         block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
 185                         offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
 186                         //printk("backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
 187                         //      HFSPLUS_SB(sb).sect_count, block, offset);
 188                         bh = sb_bread(sb, block);
 189                         vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
 190                         if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
 191                                 memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
 192                                 mark_buffer_dirty(bh);
 193                                 brelse(bh);
 194                         } else
 195                                 printk("backup not found!\n");
 196                 }
 197                 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
 198         }
 199 }
 200
 201 static void hfsplus_put_super(struct super_block *sb)
 202 {
 203         dprint(DBG_SUPER, "hfsplus_put_super\n");
 204         if (!(sb->s_flags & MS_RDONLY)) {
 205                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 206
 207                 vhdr->modify_date = hfsp_now2mt();
 208                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 209                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 210                 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 211                 ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
 212                 wait_on_buffer(HFSPLUS_SB(sb).s_vhbh);
 213         }
 214
 215         hfsplus_close_btree(HFSPLUS_SB(sb).cat_tree);
 216         hfsplus_close_btree(HFSPLUS_SB(sb).ext_tree);
 217         iput(HFSPLUS_SB(sb).alloc_file);
 218         iput(HFSPLUS_SB(sb).hidden_dir);
 219         brelse(HFSPLUS_SB(sb).s_vhbh);
 220 }
 221
 222 static int hfsplus_statfs(struct super_block *sb, struct statfs *buf)
 223 {
 224         buf->f_type = HFSPLUS_SUPER_MAGIC;
 225         buf->f_bsize = sb->s_blocksize;
 226         buf->f_blocks = be32_to_cpu(HFSPLUS_SB(sb).s_vhdr->total_blocks);
 227         buf->f_bfree = HFSPLUS_SB(sb).free_blocks;
 228         buf->f_bavail = buf->f_bfree;
 229         buf->f_files = 0xFFFFFFFF;
 230         buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
 231         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 232
 233         return 0;
 234 }
 235
 236 int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 237 {
 238         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 239                 return 0;
 240         if (!(*flags & MS_RDONLY)) {
 241                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 242
 243                 if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_INCNSTNT)) ||
 244                     !(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 245                         printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
 246                                "running fsck.hfsplus is recommended.  leaving read-only.\n");
 247                         sb->s_flags |= MS_RDONLY;
 248                         *flags |= MS_RDONLY;
 249                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 250                         printk("HFS+-fs: Filesystem is marked locked, leaving read-only.\n");
 251                         sb->s_flags |= MS_RDONLY;
 252                         *flags |= MS_RDONLY;
 253                 }
 254         }
 255         return 0;
 256 }
 257
 258 static struct super_operations hfsplus_sops = {
 259 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
 260         .alloc_inode    = hfsplus_alloc_inode,
 261         .destroy_inode  = hfsplus_destroy_inode,
 262 #endif
 263         .read_inode     = hfsplus_read_inode,
 264         .write_inode    = hfsplus_write_inode,
 265         .clear_inode    = hfsplus_clear_inode,
 266         .put_super      = hfsplus_put_super,
 267         .write_super    = hfsplus_write_super,
 268         .statfs         = hfsplus_statfs,
 269         .remount_fs     = hfsplus_remount,
 270 };
 271
 272 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 273 struct super_block *hfsplus_read_super(struct super_block *sb, void *data,
 274                                        int silent)
 275 #else
 276 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 277 #endif
 278 {
 279         struct hfsplus_vh *vhdr;
 280         struct hfsplus_sb_info *sbi;
 281         hfsplus_cat_entry entry;
 282         struct hfsplus_find_data fd;
 283         struct qstr str;
 284         int err = -EINVAL;
 285
 286         sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
 287         if (!sbi) {
 288                 err = -ENOMEM;
 289                 goto out2;
 290         }
 291         memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
 292 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 293         if (sizeof(struct inode) - offsetof(struct inode, u) < sizeof(struct hfsplus_inode_info)) {
 294                 extern void hfsplus_inode_info_exceeded_space_in_inode_error(void);
 295                 hfsplus_inode_info_exceeded_space_in_inode_error();
 296         }
 297
 298         if (sizeof(struct super_block) - offsetof(struct super_block, u) < sizeof(struct hfsplus_sb_info)) {
 299                 extern void hfsplus_sb_info_exceeded_space_in_super_block_error(void);
 300                 hfsplus_sb_info_exceeded_space_in_super_block_error();
 301         }
 302
 303         INIT_LIST_HEAD(&HFSPLUS_SB(sb).rsrc_inodes);
 304 #else
 305         sb->s_fs_info = sbi;
 306         INIT_HLIST_HEAD(&sbi->rsrc_inodes);
 307 #endif
 308         fill_defaults(sbi);
 309         if (!parse_options(data, sbi)) {
 310                 if (!silent)
 311                         printk("HFS+-fs: unable to parse mount options\n");
 312                 err = -EINVAL;
 313                 goto out2;
 314         }
 315 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 316         fill_current(sbi, &HFSPLUS_SB(sb));
 317         kfree(sbi);
 318 #endif
 319
 320         /* Grab the volume header */
 321         if (hfsplus_read_wrapper(sb)) {
 322                 if (!silent)
 323                         printk("HFS+-fs: unable to find HFS+ superblock\n");
 324                 err = -EINVAL;
 325                 goto out2;
 326         }
 327         vhdr = HFSPLUS_SB(sb).s_vhdr;
 328
 329         /* Copy parts of the volume header into the superblock */
 330         sb->s_magic = be16_to_cpu(vhdr->signature);
 331         if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) {
 332                 if (!silent)
 333                         printk("HFS+-fs: wrong filesystem version\n");
 334                 goto cleanup;
 335         }
 336         HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
 337         HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
 338         HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
 339         HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
 340         HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
 341         HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
 342
 343         /* Set up operations so we can load metadata */
 344         sb->s_op = &hfsplus_sops;
 345
 346         if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_INCNSTNT)) ||
 347             !(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 348                 if (!silent)
 349                         printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
 350                                "running fsck.hfsplus is recommended.  mounting read-only.\n");
 351                 sb->s_flags |= MS_RDONLY;
 352         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 353                 if (!silent)
 354                         printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
 355                 sb->s_flags |= MS_RDONLY;
 356         }
 357
 358         /* Load metadata objects (B*Trees) */
 359         HFSPLUS_SB(sb).ext_tree = hfsplus_open_btree(sb, HFSPLUS_EXT_CNID);
 360         if (!HFSPLUS_SB(sb).ext_tree) {
 361                 if (!silent)
 362                         printk("HFS+-fs: failed to load extents file\n");
 363                 goto cleanup;
 364         }
 365         HFSPLUS_SB(sb).cat_tree = hfsplus_open_btree(sb, HFSPLUS_CAT_CNID);
 366         if (!HFSPLUS_SB(sb).cat_tree) {
 367                 if (!silent)
 368                         printk("HFS+-fs: failed to load catalog file\n");
 369                 goto cleanup;
 370         }
 371
 372         HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
 373         if (!HFSPLUS_SB(sb).alloc_file) {
 374                 if (!silent)
 375                         printk("HFS+-fs: failed to load allocation file\n");
 376                 goto cleanup;
 377         }
 378
 379         /* Load the root directory */
 380         sb->s_root = d_alloc_root(iget(sb, HFSPLUS_ROOT_CNID));
 381         if (!sb->s_root) {
 382                 if (!silent)
 383                         printk("HFS+-fs: failed to load root directory\n");
 384                 goto cleanup;
 385         }
 386
 387         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 388         str.name = HFSP_HIDDENDIR_NAME;
 389         hfsplus_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 390         hfsplus_fill_cat_key(fd.search_key, HFSPLUS_ROOT_CNID, &str);
 391         if (!hfsplus_btree_find_entry(&fd, &entry, sizeof(entry))) {
 392                 hfsplus_find_exit(&fd);
 393                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 394                         goto cleanup;
 395                 HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
 396                 if (!HFSPLUS_SB(sb).hidden_dir)
 397                         goto cleanup;
 398         } else
 399                 hfsplus_find_exit(&fd);
 400
 401         if (sb->s_flags & MS_RDONLY)
 402                 goto out;
 403
 404         /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 405          * all three are registered with Apple for our use
 406          */
 407         vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 408         vhdr->modify_date = hfsp_now2mt();
 409         vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
 410         vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 411         vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 412         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 413         ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
 414         wait_on_buffer(HFSPLUS_SB(sb).s_vhbh);
 415
 416         if (!HFSPLUS_SB(sb).hidden_dir) {
 417                 printk("HFS+: create hidden dir...\n");
 418                 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 419                 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
 420                                    &str, HFSPLUS_SB(sb).hidden_dir);
 421                 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
 422         }
 423 out:
 424 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 425         return sb;
 426 #else
 427         return 0;
 428 #endif
 429
 430 cleanup:
 431         hfsplus_put_super(sb);
 432 out2:
 433 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 434         return NULL;
 435 #else
 436         return err;
 437 #endif
 438 }
 439
 440 MODULE_AUTHOR("Brad Boyer");
 441 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 442 MODULE_LICENSE("GPL");
 443
 444 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
 445
 446 static DECLARE_FSTYPE_DEV(hfsplus_fs_type, "hfsplus", hfsplus_read_super);
 447
 448 static int __init init_hfsplus_fs(void)
 449 {
 450         return register_filesystem(&hfsplus_fs_type);
 451 }
 452
 453 static void __exit exit_hfsplus_fs(void)
 454 {
 455         unregister_filesystem(&hfsplus_fs_type);
 456 }
 457
 458 EXPORT_NO_SYMBOLS;
 459
 460 #else
 461
 462 static kmem_cache_t * hfsplus_inode_cachep;
 463
 464 static void init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
 465 {
 466         struct hfsplus_inode_info *i = (struct hfsplus_inode_info *)p;
 467
 468         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR) {
 469                 inode_init_once(&i->vfs_inode);
 470         }
 471 }
 472
 473 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 474 {
 475         struct hfsplus_inode_info *i;
 476         i = (struct hfsplus_inode_info *)kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL);
 477         return i ? &i->vfs_inode : NULL;
 478 }
 479
 480 static void hfsplus_destroy_inode(struct inode *inode)
 481 {
 482         kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
 483 }
 484
 485 static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type,
 486                                           int flags, char *dev_name, void *data)
 487 {
 488         return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
 489 }
 490
 491 static struct file_system_type hfsplus_fs_type = {
 492         .owner          = THIS_MODULE,
 493         .name           = "hfsplus",
 494         .get_sb         = hfsplus_get_sb,
 495         .kill_sb        = kill_block_super,
 496         .fs_flags       = FS_REQUIRES_DEV,
 497 };
 498
 499 static int __init init_hfsplus_fs(void)
 500 {
 501         int err;
 502
 503         hfsplus_inode_cachep = kmem_cache_create("hfsplus_inode_cache",
 504                 sizeof(struct hfsplus_inode_info), 0, SLAB_HWCACHE_ALIGN,
 505                 init_once, NULL);
 506         if (!hfsplus_inode_cachep)
 507                 return -ENOMEM;
 508         err = register_filesystem(&hfsplus_fs_type);
 509         if (err)
 510                 kmem_cache_destroy(hfsplus_inode_cachep);
 511         return err;
 512 }
 513
 514 static void __exit exit_hfsplus_fs(void)
 515 {
 516         unregister_filesystem(&hfsplus_fs_type);
 517         if (kmem_cache_destroy(hfsplus_inode_cachep))
 518                 printk(KERN_INFO "hfsplus_inode_cache: not all structures were freed\n");
 519 }
 520 #endif
 521
 522 module_init(init_hfsplus_fs)
 523 module_exit(exit_hfsplus_fs)