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 int hfsplus_sync_fs(struct super_block *sb, int wait)
 156 {
 157         struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 158
 159         dprint(DBG_SUPER, "hfsplus_write_super\n");
 160
 161         lock_super(sb);
 162         sb->s_dirt = 0;
 163
 164         vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
 165         vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
 166         vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
 167         vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
 168         vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
 169
 170         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 171         if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
 172                 if (HFSPLUS_SB(sb).sect_count) {
 173                         struct buffer_head *bh;
 174                         u32 block, offset;
 175
 176                         block = HFSPLUS_SB(sb).blockoffset;
 177                         block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
 178                         offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
 179                         printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
 180                                 HFSPLUS_SB(sb).sect_count, block, offset);
 181                         bh = sb_bread(sb, block);
 182                         if (bh) {
 183                                 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
 184                                 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
 185                                         memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
 186                                         mark_buffer_dirty(bh);
 187                                         brelse(bh);
 188                                 } else
 189                                         printk(KERN_WARNING "hfs: backup not found!\n");
 190                         }
 191                 }
 192                 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
 193         }
 194         unlock_super(sb);
 195         return 0;
 196 }
 197
 198 static void hfsplus_write_super(struct super_block *sb)
 199 {
 200         if (!(sb->s_flags & MS_RDONLY))
 201                 hfsplus_sync_fs(sb, 1);
 202         else
 203                 sb->s_dirt = 0;
 204 }
 205
 206 static void hfsplus_put_super(struct super_block *sb)
 207 {
 208         dprint(DBG_SUPER, "hfsplus_put_super\n");
 209         if (!sb->s_fs_info)
 210                 return;
 211
 212         lock_kernel();
 213
 214         if (sb->s_dirt)
 215                 hfsplus_write_super(sb);
 216         if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
 217                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 218
 219                 vhdr->modify_date = hfsp_now2mt();
 220                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 221                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 222                 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 223                 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
 224         }
 225
 226         hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
 227         hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
 228         iput(HFSPLUS_SB(sb).alloc_file);
 229         iput(HFSPLUS_SB(sb).hidden_dir);
 230         brelse(HFSPLUS_SB(sb).s_vhbh);
 231         if (HFSPLUS_SB(sb).nls)
 232                 unload_nls(HFSPLUS_SB(sb).nls);
 233         kfree(sb->s_fs_info);
 234         sb->s_fs_info = NULL;
 235
 236         unlock_kernel();
 237 }
 238
 239 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 240 {
 241         struct super_block *sb = dentry->d_sb;
 242         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 243
 244         buf->f_type = HFSPLUS_SUPER_MAGIC;
 245         buf->f_bsize = sb->s_blocksize;
 246         buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
 247         buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
 248         buf->f_bavail = buf->f_bfree;
 249         buf->f_files = 0xFFFFFFFF;
 250         buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
 251         buf->f_fsid.val[0] = (u32)id;
 252         buf->f_fsid.val[1] = (u32)(id >> 32);
 253         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 254
 255         return 0;
 256 }
 257
 258 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 259 {
 260         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 261                 return 0;
 262         if (!(*flags & MS_RDONLY)) {
 263                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 264                 struct hfsplus_sb_info sbi;
 265
 266                 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
 267                 sbi.nls = HFSPLUS_SB(sb).nls;
 268                 if (!hfsplus_parse_options(data, &sbi))
 269                         return -EINVAL;
 270
 271                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 272                         printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
 273                                "running fsck.hfsplus is recommended.  leaving read-only.\n");
 274                         sb->s_flags |= MS_RDONLY;
 275                         *flags |= MS_RDONLY;
 276                 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
 277                         /* nothing */
 278                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 279                         printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
 280                         sb->s_flags |= MS_RDONLY;
 281                         *flags |= MS_RDONLY;
 282                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 283                         printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
 284                         sb->s_flags |= MS_RDONLY;
 285                         *flags |= MS_RDONLY;
 286                 }
 287         }
 288         return 0;
 289 }
 290
 291 static const struct super_operations hfsplus_sops = {
 292         .alloc_inode    = hfsplus_alloc_inode,
 293         .destroy_inode  = hfsplus_destroy_inode,
 294         .write_inode    = hfsplus_write_inode,
 295         .clear_inode    = hfsplus_clear_inode,
 296         .put_super      = hfsplus_put_super,
 297         .write_super    = hfsplus_write_super,
 298         .sync_fs        = hfsplus_sync_fs,
 299         .statfs         = hfsplus_statfs,
 300         .remount_fs     = hfsplus_remount,
 301         .show_options   = hfsplus_show_options,
 302 };
 303
 304 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 305 {
 306         struct hfsplus_vh *vhdr;
 307         struct hfsplus_sb_info *sbi;
 308         hfsplus_cat_entry entry;
 309         struct hfs_find_data fd;
 310         struct inode *root, *inode;
 311         struct qstr str;
 312         struct nls_table *nls = NULL;
 313         int err = -EINVAL;
 314
 315         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 316         if (!sbi)
 317                 return -ENOMEM;
 318
 319         sb->s_fs_info = sbi;
 320         INIT_HLIST_HEAD(&sbi->rsrc_inodes);
 321         hfsplus_fill_defaults(sbi);
 322         if (!hfsplus_parse_options(data, sbi)) {
 323                 printk(KERN_ERR "hfs: unable to parse mount options\n");
 324                 err = -EINVAL;
 325                 goto cleanup;
 326         }
 327
 328         /* temporarily use utf8 to correctly find the hidden dir below */
 329         nls = sbi->nls;
 330         sbi->nls = load_nls("utf8");
 331         if (!sbi->nls) {
 332                 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
 333                 err = -EINVAL;
 334                 goto cleanup;
 335         }
 336
 337         /* Grab the volume header */
 338         if (hfsplus_read_wrapper(sb)) {
 339                 if (!silent)
 340                         printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
 341                 err = -EINVAL;
 342                 goto cleanup;
 343         }
 344         vhdr = HFSPLUS_SB(sb).s_vhdr;
 345
 346         /* Copy parts of the volume header into the superblock */
 347         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 348         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 349             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 350                 printk(KERN_ERR "hfs: wrong filesystem version\n");
 351                 goto cleanup;
 352         }
 353         HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
 354         HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
 355         HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
 356         HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
 357         HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
 358         HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
 359         HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 360         if (!HFSPLUS_SB(sb).data_clump_blocks)
 361                 HFSPLUS_SB(sb).data_clump_blocks = 1;
 362         HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 363         if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
 364                 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
 365
 366         /* Set up operations so we can load metadata */
 367         sb->s_op = &hfsplus_sops;
 368         sb->s_maxbytes = MAX_LFS_FILESIZE;
 369
 370         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 371                 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
 372                        "running fsck.hfsplus is recommended.  mounting read-only.\n");
 373                 sb->s_flags |= MS_RDONLY;
 374         } else if (sbi->flags & HFSPLUS_SB_FORCE) {
 375                 /* nothing */
 376         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 377                 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
 378                 sb->s_flags |= MS_RDONLY;
 379         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) {
 380                 printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
 381                        "use the force option at your own risk, mounting read-only.\n");
 382                 sb->s_flags |= MS_RDONLY;
 383         }
 384         sbi->flags &= ~HFSPLUS_SB_FORCE;
 385
 386         /* Load metadata objects (B*Trees) */
 387         HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 388         if (!HFSPLUS_SB(sb).ext_tree) {
 389                 printk(KERN_ERR "hfs: failed to load extents file\n");
 390                 goto cleanup;
 391         }
 392         HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 393         if (!HFSPLUS_SB(sb).cat_tree) {
 394                 printk(KERN_ERR "hfs: failed to load catalog file\n");
 395                 goto cleanup;
 396         }
 397
 398         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 399         if (IS_ERR(inode)) {
 400                 printk(KERN_ERR "hfs: failed to load allocation file\n");
 401                 err = PTR_ERR(inode);
 402                 goto cleanup;
 403         }
 404         HFSPLUS_SB(sb).alloc_file = inode;
 405
 406         /* Load the root directory */
 407         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 408         if (IS_ERR(root)) {
 409                 printk(KERN_ERR "hfs: failed to load root directory\n");
 410                 err = PTR_ERR(root);
 411                 goto cleanup;
 412         }
 413         sb->s_root = d_alloc_root(root);
 414         if (!sb->s_root) {
 415                 iput(root);
 416                 err = -ENOMEM;
 417                 goto cleanup;
 418         }
 419         sb->s_root->d_op = &hfsplus_dentry_operations;
 420
 421         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 422         str.name = HFSP_HIDDENDIR_NAME;
 423         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 424         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 425         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 426                 hfs_find_exit(&fd);
 427                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 428                         goto cleanup;
 429                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 430                 if (IS_ERR(inode)) {
 431                         err = PTR_ERR(inode);
 432                         goto cleanup;
 433                 }
 434                 HFSPLUS_SB(sb).hidden_dir = inode;
 435         } else
 436                 hfs_find_exit(&fd);
 437
 438         if (sb->s_flags & MS_RDONLY)
 439                 goto out;
 440
 441         /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 442          * all three are registered with Apple for our use
 443          */
 444         vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 445         vhdr->modify_date = hfsp_now2mt();
 446         be32_add_cpu(&vhdr->write_count, 1);
 447         vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 448         vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 449         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 450         sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
 451
 452         if (!HFSPLUS_SB(sb).hidden_dir) {
 453                 printk(KERN_DEBUG "hfs: create hidden dir...\n");
 454                 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 455                 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
 456                                    &str, HFSPLUS_SB(sb).hidden_dir);
 457                 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
 458         }
 459 out:
 460         unload_nls(sbi->nls);
 461         sbi->nls = nls;
 462         return 0;
 463
 464 cleanup:
 465         hfsplus_put_super(sb);
 466         if (nls)
 467                 unload_nls(nls);
 468         return err;
 469 }
 470
 471 MODULE_AUTHOR("Brad Boyer");
 472 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 473 MODULE_LICENSE("GPL");
 474
 475 static struct kmem_cache *hfsplus_inode_cachep;
 476
 477 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 478 {
 479         struct hfsplus_inode_info *i;
 480
 481         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 482         return i ? &i->vfs_inode : NULL;
 483 }
 484
 485 static void hfsplus_destroy_inode(struct inode *inode)
 486 {
 487         kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
 488 }
 489
 490 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 491
 492 static int hfsplus_get_sb(struct file_system_type *fs_type,
 493                           int flags, const char *dev_name, void *data,
 494                           struct vfsmount *mnt)
 495 {
 496         return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
 497                            mnt);
 498 }
 499
 500 static struct file_system_type hfsplus_fs_type = {
 501         .owner          = THIS_MODULE,
 502         .name           = "hfsplus",
 503         .get_sb         = hfsplus_get_sb,
 504         .kill_sb        = kill_block_super,
 505         .fs_flags       = FS_REQUIRES_DEV,
 506 };
 507
 508 static void hfsplus_init_once(void *p)
 509 {
 510         struct hfsplus_inode_info *i = p;
 511
 512         inode_init_once(&i->vfs_inode);
 513 }
 514
 515 static int __init init_hfsplus_fs(void)
 516 {
 517         int err;
 518
 519         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 520                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 521                 hfsplus_init_once);
 522         if (!hfsplus_inode_cachep)
 523                 return -ENOMEM;
 524         err = register_filesystem(&hfsplus_fs_type);
 525         if (err)
 526                 kmem_cache_destroy(hfsplus_inode_cachep);
 527         return err;
 528 }
 529
 530 static void __exit exit_hfsplus_fs(void)
 531 {
 532         unregister_filesystem(&hfsplus_fs_type);
 533         kmem_cache_destroy(hfsplus_inode_cachep);
 534 }
 535
 536 module_init(init_hfsplus_fs)
 537 module_exit(exit_hfsplus_fs)