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 int hfsplus_system_read_inode(struct inode *inode)
  24 {
  25         struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
  26
  27         switch (inode->i_ino) {
  28         case HFSPLUS_EXT_CNID:
  29                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
  30                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  31                 break;
  32         case HFSPLUS_CAT_CNID:
  33                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
  34                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  35                 break;
  36         case HFSPLUS_ALLOC_CNID:
  37                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
  38                 inode->i_mapping->a_ops = &hfsplus_aops;
  39                 break;
  40         case HFSPLUS_START_CNID:
  41                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
  42                 break;
  43         case HFSPLUS_ATTR_CNID:
  44                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
  45                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  46                 break;
  47         default:
  48                 return -EIO;
  49         }
  50
  51         return 0;
  52 }
  53
  54 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
  55 {
  56         struct hfs_find_data fd;
  57         struct inode *inode;
  58         int err;
  59
  60         inode = iget_locked(sb, ino);
  61         if (!inode)
  62                 return ERR_PTR(-ENOMEM);
  63         if (!(inode->i_state & I_NEW))
  64                 return inode;
  65
  66         INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
  67         mutex_init(&HFSPLUS_I(inode)->extents_lock);
  68         HFSPLUS_I(inode)->flags = 0;
  69         HFSPLUS_I(inode)->rsrc_inode = NULL;
  70         atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
  71
  72         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
  73             inode->i_ino == HFSPLUS_ROOT_CNID) {
  74                 hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
  75                 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
  76                 if (!err)
  77                         err = hfsplus_cat_read_inode(inode, &fd);
  78                 hfs_find_exit(&fd);
  79         } else {
  80                 err = hfsplus_system_read_inode(inode);
  81         }
  82
  83         if (err) {
  84                 iget_failed(inode);
  85                 return ERR_PTR(err);
  86         }
  87
  88         unlock_new_inode(inode);
  89         return inode;
  90 }
  91
  92 static int hfsplus_write_inode(struct inode *inode,
  93                 struct writeback_control *wbc)
  94 {
  95         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
  96         struct hfsplus_vh *vhdr;
  97         int ret = 0;
  98
  99         dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
 100         hfsplus_ext_write_extent(inode);
 101         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
 102                 return hfsplus_cat_write_inode(inode);
 103         }
 104         vhdr = sbi->s_vhdr;
 105         switch (inode->i_ino) {
 106         case HFSPLUS_ROOT_CNID:
 107                 ret = hfsplus_cat_write_inode(inode);
 108                 break;
 109         case HFSPLUS_EXT_CNID:
 110                 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
 111                         sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
 112                         inode->i_sb->s_dirt = 1;
 113                 }
 114                 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
 115                 hfs_btree_write(sbi->ext_tree);
 116                 break;
 117         case HFSPLUS_CAT_CNID:
 118                 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
 119                         sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
 120                         inode->i_sb->s_dirt = 1;
 121                 }
 122                 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
 123                 hfs_btree_write(sbi->cat_tree);
 124                 break;
 125         case HFSPLUS_ALLOC_CNID:
 126                 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
 127                         sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
 128                         inode->i_sb->s_dirt = 1;
 129                 }
 130                 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
 131                 break;
 132         case HFSPLUS_START_CNID:
 133                 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
 134                         sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
 135                         inode->i_sb->s_dirt = 1;
 136                 }
 137                 hfsplus_inode_write_fork(inode, &vhdr->start_file);
 138                 break;
 139         case HFSPLUS_ATTR_CNID:
 140                 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
 141                         sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
 142                         inode->i_sb->s_dirt = 1;
 143                 }
 144                 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
 145                 hfs_btree_write(sbi->attr_tree);
 146                 break;
 147         }
 148         return ret;
 149 }
 150
 151 static void hfsplus_evict_inode(struct inode *inode)
 152 {
 153         dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
 154         truncate_inode_pages(&inode->i_data, 0);
 155         end_writeback(inode);
 156         if (HFSPLUS_IS_RSRC(inode)) {
 157                 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
 158                 iput(HFSPLUS_I(inode)->rsrc_inode);
 159         }
 160 }
 161
 162 int hfsplus_sync_fs(struct super_block *sb, int wait)
 163 {
 164         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 165         struct hfsplus_vh *vhdr = sbi->s_vhdr;
 166
 167         dprint(DBG_SUPER, "hfsplus_write_super\n");
 168
 169         mutex_lock(&sbi->alloc_mutex);
 170         sb->s_dirt = 0;
 171
 172         vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
 173         vhdr->next_alloc = cpu_to_be32(sbi->next_alloc);
 174         vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
 175         vhdr->folder_count = cpu_to_be32(sbi->folder_count);
 176         vhdr->file_count = cpu_to_be32(sbi->file_count);
 177
 178         mark_buffer_dirty(sbi->s_vhbh);
 179         if (sbi->flags & HFSPLUS_SB_WRITEBACKUP) {
 180                 if (sbi->sect_count) {
 181                         struct buffer_head *bh;
 182                         u32 block, offset;
 183
 184                         block = sbi->blockoffset;
 185                         block += (sbi->sect_count - 2) >> (sb->s_blocksize_bits - 9);
 186                         offset = ((sbi->sect_count - 2) << 9) & (sb->s_blocksize - 1);
 187                         printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n",
 188                                           sbi->blockoffset, sbi->sect_count,
 189                                           block, offset);
 190                         bh = sb_bread(sb, block);
 191                         if (bh) {
 192                                 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
 193                                 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
 194                                         memcpy(vhdr, sbi->s_vhdr, sizeof(*vhdr));
 195                                         mark_buffer_dirty(bh);
 196                                         brelse(bh);
 197                                 } else
 198                                         printk(KERN_WARNING "hfs: backup not found!\n");
 199                         }
 200                 }
 201                 sbi->flags &= ~HFSPLUS_SB_WRITEBACKUP;
 202         }
 203         mutex_unlock(&sbi->alloc_mutex);
 204         return 0;
 205 }
 206
 207 static void hfsplus_write_super(struct super_block *sb)
 208 {
 209         if (!(sb->s_flags & MS_RDONLY))
 210                 hfsplus_sync_fs(sb, 1);
 211         else
 212                 sb->s_dirt = 0;
 213 }
 214
 215 static void hfsplus_put_super(struct super_block *sb)
 216 {
 217         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 218
 219         dprint(DBG_SUPER, "hfsplus_put_super\n");
 220
 221         if (!sb->s_fs_info)
 222                 return;
 223
 224         if (sb->s_dirt)
 225                 hfsplus_write_super(sb);
 226         if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
 227                 struct hfsplus_vh *vhdr = sbi->s_vhdr;
 228
 229                 vhdr->modify_date = hfsp_now2mt();
 230                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 231                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 232                 mark_buffer_dirty(sbi->s_vhbh);
 233                 sync_dirty_buffer(sbi->s_vhbh);
 234         }
 235
 236         hfs_btree_close(sbi->cat_tree);
 237         hfs_btree_close(sbi->ext_tree);
 238         iput(sbi->alloc_file);
 239         iput(sbi->hidden_dir);
 240         brelse(sbi->s_vhbh);
 241         unload_nls(sbi->nls);
 242         kfree(sb->s_fs_info);
 243         sb->s_fs_info = NULL;
 244 }
 245
 246 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 247 {
 248         struct super_block *sb = dentry->d_sb;
 249         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 250         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 251
 252         buf->f_type = HFSPLUS_SUPER_MAGIC;
 253         buf->f_bsize = sb->s_blocksize;
 254         buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
 255         buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
 256         buf->f_bavail = buf->f_bfree;
 257         buf->f_files = 0xFFFFFFFF;
 258         buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
 259         buf->f_fsid.val[0] = (u32)id;
 260         buf->f_fsid.val[1] = (u32)(id >> 32);
 261         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 262
 263         return 0;
 264 }
 265
 266 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 267 {
 268         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 269                 return 0;
 270         if (!(*flags & MS_RDONLY)) {
 271                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
 272                 struct hfsplus_sb_info sbi;
 273
 274                 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
 275                 sbi.nls = HFSPLUS_SB(sb)->nls;
 276                 if (!hfsplus_parse_options(data, &sbi))
 277                         return -EINVAL;
 278
 279                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 280                         printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
 281                                "running fsck.hfsplus is recommended.  leaving read-only.\n");
 282                         sb->s_flags |= MS_RDONLY;
 283                         *flags |= MS_RDONLY;
 284                 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
 285                         /* nothing */
 286                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 287                         printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
 288                         sb->s_flags |= MS_RDONLY;
 289                         *flags |= MS_RDONLY;
 290                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 291                         printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
 292                         sb->s_flags |= MS_RDONLY;
 293                         *flags |= MS_RDONLY;
 294                 }
 295         }
 296         return 0;
 297 }
 298
 299 static const struct super_operations hfsplus_sops = {
 300         .alloc_inode    = hfsplus_alloc_inode,
 301         .destroy_inode  = hfsplus_destroy_inode,
 302         .write_inode    = hfsplus_write_inode,
 303         .evict_inode    = hfsplus_evict_inode,
 304         .put_super      = hfsplus_put_super,
 305         .write_super    = hfsplus_write_super,
 306         .sync_fs        = hfsplus_sync_fs,
 307         .statfs         = hfsplus_statfs,
 308         .remount_fs     = hfsplus_remount,
 309         .show_options   = hfsplus_show_options,
 310 };
 311
 312 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 313 {
 314         struct hfsplus_vh *vhdr;
 315         struct hfsplus_sb_info *sbi;
 316         hfsplus_cat_entry entry;
 317         struct hfs_find_data fd;
 318         struct inode *root, *inode;
 319         struct qstr str;
 320         struct nls_table *nls = NULL;
 321         int err = -EINVAL;
 322
 323         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 324         if (!sbi)
 325                 return -ENOMEM;
 326
 327         sb->s_fs_info = sbi;
 328         INIT_HLIST_HEAD(&sbi->rsrc_inodes);
 329         mutex_init(&sbi->alloc_mutex);
 330         hfsplus_fill_defaults(sbi);
 331         if (!hfsplus_parse_options(data, sbi)) {
 332                 printk(KERN_ERR "hfs: unable to parse mount options\n");
 333                 err = -EINVAL;
 334                 goto cleanup;
 335         }
 336
 337         /* temporarily use utf8 to correctly find the hidden dir below */
 338         nls = sbi->nls;
 339         sbi->nls = load_nls("utf8");
 340         if (!sbi->nls) {
 341                 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
 342                 err = -EINVAL;
 343                 goto cleanup;
 344         }
 345
 346         /* Grab the volume header */
 347         if (hfsplus_read_wrapper(sb)) {
 348                 if (!silent)
 349                         printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
 350                 err = -EINVAL;
 351                 goto cleanup;
 352         }
 353         vhdr = sbi->s_vhdr;
 354
 355         /* Copy parts of the volume header into the superblock */
 356         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 357         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 358             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 359                 printk(KERN_ERR "hfs: wrong filesystem version\n");
 360                 goto cleanup;
 361         }
 362         sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
 363         sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
 364         sbi->next_alloc = be32_to_cpu(vhdr->next_alloc);
 365         sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
 366         sbi->file_count = be32_to_cpu(vhdr->file_count);
 367         sbi->folder_count = be32_to_cpu(vhdr->folder_count);
 368         sbi->data_clump_blocks =
 369                 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
 370         if (!sbi->data_clump_blocks)
 371                 sbi->data_clump_blocks = 1;
 372         sbi->rsrc_clump_blocks =
 373                 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
 374         if (!sbi->rsrc_clump_blocks)
 375                 sbi->rsrc_clump_blocks = 1;
 376
 377         /* Set up operations so we can load metadata */
 378         sb->s_op = &hfsplus_sops;
 379         sb->s_maxbytes = MAX_LFS_FILESIZE;
 380
 381         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 382                 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
 383                        "running fsck.hfsplus is recommended.  mounting read-only.\n");
 384                 sb->s_flags |= MS_RDONLY;
 385         } else if (sbi->flags & HFSPLUS_SB_FORCE) {
 386                 /* nothing */
 387         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 388                 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
 389                 sb->s_flags |= MS_RDONLY;
 390         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) {
 391                 printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
 392                        "use the force option at your own risk, mounting read-only.\n");
 393                 sb->s_flags |= MS_RDONLY;
 394         }
 395         sbi->flags &= ~HFSPLUS_SB_FORCE;
 396
 397         /* Load metadata objects (B*Trees) */
 398         sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 399         if (!sbi->ext_tree) {
 400                 printk(KERN_ERR "hfs: failed to load extents file\n");
 401                 goto cleanup;
 402         }
 403         sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 404         if (!sbi->cat_tree) {
 405                 printk(KERN_ERR "hfs: failed to load catalog file\n");
 406                 goto cleanup;
 407         }
 408
 409         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 410         if (IS_ERR(inode)) {
 411                 printk(KERN_ERR "hfs: failed to load allocation file\n");
 412                 err = PTR_ERR(inode);
 413                 goto cleanup;
 414         }
 415         sbi->alloc_file = inode;
 416
 417         /* Load the root directory */
 418         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 419         if (IS_ERR(root)) {
 420                 printk(KERN_ERR "hfs: failed to load root directory\n");
 421                 err = PTR_ERR(root);
 422                 goto cleanup;
 423         }
 424         sb->s_root = d_alloc_root(root);
 425         if (!sb->s_root) {
 426                 iput(root);
 427                 err = -ENOMEM;
 428                 goto cleanup;
 429         }
 430         sb->s_root->d_op = &hfsplus_dentry_operations;
 431
 432         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 433         str.name = HFSP_HIDDENDIR_NAME;
 434         hfs_find_init(sbi->cat_tree, &fd);
 435         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 436         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 437                 hfs_find_exit(&fd);
 438                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 439                         goto cleanup;
 440                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 441                 if (IS_ERR(inode)) {
 442                         err = PTR_ERR(inode);
 443                         goto cleanup;
 444                 }
 445                 sbi->hidden_dir = inode;
 446         } else
 447                 hfs_find_exit(&fd);
 448
 449         if (sb->s_flags & MS_RDONLY)
 450                 goto out;
 451
 452         /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 453          * all three are registered with Apple for our use
 454          */
 455         vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 456         vhdr->modify_date = hfsp_now2mt();
 457         be32_add_cpu(&vhdr->write_count, 1);
 458         vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 459         vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 460         mark_buffer_dirty(sbi->s_vhbh);
 461         sync_dirty_buffer(sbi->s_vhbh);
 462
 463         if (!sbi->hidden_dir) {
 464                 printk(KERN_DEBUG "hfs: create hidden dir...\n");
 465                 sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 466                 hfsplus_create_cat(sbi->hidden_dir->i_ino, sb->s_root->d_inode,
 467                                    &str, sbi->hidden_dir);
 468                 mark_inode_dirty(sbi->hidden_dir);
 469         }
 470 out:
 471         unload_nls(sbi->nls);
 472         sbi->nls = nls;
 473         return 0;
 474
 475 cleanup:
 476         hfsplus_put_super(sb);
 477         unload_nls(nls);
 478         return err;
 479 }
 480
 481 MODULE_AUTHOR("Brad Boyer");
 482 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 483 MODULE_LICENSE("GPL");
 484
 485 static struct kmem_cache *hfsplus_inode_cachep;
 486
 487 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 488 {
 489         struct hfsplus_inode_info *i;
 490
 491         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 492         return i ? &i->vfs_inode : NULL;
 493 }
 494
 495 static void hfsplus_destroy_inode(struct inode *inode)
 496 {
 497         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
 498 }
 499
 500 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 501
 502 static int hfsplus_get_sb(struct file_system_type *fs_type,
 503                           int flags, const char *dev_name, void *data,
 504                           struct vfsmount *mnt)
 505 {
 506         return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
 507                            mnt);
 508 }
 509
 510 static struct file_system_type hfsplus_fs_type = {
 511         .owner          = THIS_MODULE,
 512         .name           = "hfsplus",
 513         .get_sb         = hfsplus_get_sb,
 514         .kill_sb        = kill_block_super,
 515         .fs_flags       = FS_REQUIRES_DEV,
 516 };
 517
 518 static void hfsplus_init_once(void *p)
 519 {
 520         struct hfsplus_inode_info *i = p;
 521
 522         inode_init_once(&i->vfs_inode);
 523 }
 524
 525 static int __init init_hfsplus_fs(void)
 526 {
 527         int err;
 528
 529         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 530                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 531                 hfsplus_init_once);
 532         if (!hfsplus_inode_cachep)
 533                 return -ENOMEM;
 534         err = register_filesystem(&hfsplus_fs_type);
 535         if (err)
 536                 kmem_cache_destroy(hfsplus_inode_cachep);
 537         return err;
 538 }
 539
 540 static void __exit exit_hfsplus_fs(void)
 541 {
 542         unregister_filesystem(&hfsplus_fs_type);
 543         kmem_cache_destroy(hfsplus_inode_cachep);
 544 }
 545
 546 module_init(init_hfsplus_fs)
 547 module_exit(exit_hfsplus_fs)