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