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