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/smp_lock.h>
  16 #include <linux/vfs.h>
  17 #include <linux/nls.h>
  18
  19 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
  20 static void hfsplus_destroy_inode(struct inode *inode);
  21
  22 #include "hfsplus_fs.h"
  23
  24 static bool hfsplus_vol_has_journal(struct hfsplus_vh *vhdr)
  25 {
  26         return (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED) &&
  27                                 vhdr->journal_info_block);
  28 }
  29
  30 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
  31 {
  32         struct hfs_find_data fd;
  33         struct hfsplus_vh *vhdr;
  34         struct inode *inode;
  35         long err = -EIO;
  36
  37         inode = iget_locked(sb, ino);
  38         if (!inode)
  39                 return ERR_PTR(-ENOMEM);
  40         if (!(inode->i_state & I_NEW))
  41                 return inode;
  42
  43         INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
  44         mutex_init(&HFSPLUS_I(inode).extents_lock);
  45         HFSPLUS_I(inode).flags = 0;
  46         HFSPLUS_I(inode).rsrc_inode = NULL;
  47         atomic_set(&HFSPLUS_I(inode).opencnt, 0);
  48
  49         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
  50         read_inode:
  51                 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
  52                 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
  53                 if (!err)
  54                         err = hfsplus_cat_read_inode(inode, &fd);
  55                 hfs_find_exit(&fd);
  56                 if (err)
  57                         goto bad_inode;
  58                 goto done;
  59         }
  60         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
  61         switch(inode->i_ino) {
  62         case HFSPLUS_ROOT_CNID:
  63                 goto read_inode;
  64         case HFSPLUS_EXT_CNID:
  65                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
  66                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  67                 break;
  68         case HFSPLUS_CAT_CNID:
  69                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
  70                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  71                 break;
  72         case HFSPLUS_ALLOC_CNID:
  73                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
  74                 inode->i_mapping->a_ops = &hfsplus_aops;
  75                 break;
  76         case HFSPLUS_START_CNID:
  77                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
  78                 break;
  79         case HFSPLUS_ATTR_CNID:
  80                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
  81                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  82                 break;
  83         default:
  84                 goto bad_inode;
  85         }
  86
  87 done:
  88         unlock_new_inode(inode);
  89         return inode;
  90
  91 bad_inode:
  92         iget_failed(inode);
  93         return ERR_PTR(err);
  94 }
  95
  96 static int hfsplus_write_inode(struct inode *inode, int unused)
  97 {
  98         struct hfsplus_vh *vhdr;
  99         int ret = 0;
 100
 101         dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
 102         hfsplus_ext_write_extent(inode);
 103         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
 104                 return hfsplus_cat_write_inode(inode);
 105         }
 106         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
 107         switch (inode->i_ino) {
 108         case HFSPLUS_ROOT_CNID:
 109                 ret = hfsplus_cat_write_inode(inode);
 110                 break;
 111         case HFSPLUS_EXT_CNID:
 112                 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
 113                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 114                         inode->i_sb->s_dirt = 1;
 115                 }
 116                 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
 117                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
 118                 break;
 119         case HFSPLUS_CAT_CNID:
 120                 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
 121                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 122                         inode->i_sb->s_dirt = 1;
 123                 }
 124                 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
 125                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
 126                 break;
 127         case HFSPLUS_ALLOC_CNID:
 128                 if (vhdr->alloc_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->alloc_file);
 133                 break;
 134         case HFSPLUS_START_CNID:
 135                 if (vhdr->start_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->start_file);
 140                 break;
 141         case HFSPLUS_ATTR_CNID:
 142                 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
 143                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 144                         inode->i_sb->s_dirt = 1;
 145                 }
 146                 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
 147                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
 148                 break;
 149         }
 150         return ret;
 151 }
 152
 153 static void hfsplus_clear_inode(struct inode *inode)
 154 {
 155         dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
 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 static int hfsplus_sync_fs(struct super_block *sb, int wait)
 163 {
 164         struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 165
 166         dprint(DBG_SUPER, "hfsplus_write_super\n");
 167
 168         lock_super(sb);
 169         sb->s_dirt = 0;
 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(KERN_DEBUG "hfs: 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                         if (bh) {
 190                                 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
 191                                 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
 192                                         memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
 193                                         mark_buffer_dirty(bh);
 194                                         brelse(bh);
 195                                 } else
 196                                         printk(KERN_WARNING "hfs: backup not found!\n");
 197                         }
 198                 }
 199                 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
 200         }
 201         unlock_super(sb);
 202         return 0;
 203 }
 204
 205 static void hfsplus_write_super(struct super_block *sb)
 206 {
 207         if (!(sb->s_flags & MS_RDONLY))
 208                 hfsplus_sync_fs(sb, 1);
 209         else
 210                 sb->s_dirt = 0;
 211 }
 212
 213 static void hfsplus_put_super(struct super_block *sb)
 214 {
 215         dprint(DBG_SUPER, "hfsplus_put_super\n");
 216         if (!sb->s_fs_info)
 217                 return;
 218
 219         lock_kernel();
 220
 221         if (sb->s_dirt)
 222                 hfsplus_write_super(sb);
 223         if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
 224                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 225
 226                 vhdr->modify_date = hfsp_now2mt();
 227                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 228                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 229                 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 230                 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
 231         }
 232
 233         hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
 234         hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
 235         iput(HFSPLUS_SB(sb).alloc_file);
 236         iput(HFSPLUS_SB(sb).hidden_dir);
 237         brelse(HFSPLUS_SB(sb).s_vhbh);
 238         unload_nls(HFSPLUS_SB(sb).nls);
 239         kfree(sb->s_fs_info);
 240         sb->s_fs_info = NULL;
 241
 242         unlock_kernel();
 243 }
 244
 245 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 246 {
 247         struct super_block *sb = dentry->d_sb;
 248         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 249
 250         buf->f_type = HFSPLUS_SUPER_MAGIC;
 251         buf->f_bsize = sb->s_blocksize;
 252         buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
 253         buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
 254         buf->f_bavail = buf->f_bfree;
 255         buf->f_files = 0xFFFFFFFF;
 256         buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
 257         buf->f_fsid.val[0] = (u32)id;
 258         buf->f_fsid.val[1] = (u32)(id >> 32);
 259         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 260
 261         return 0;
 262 }
 263
 264 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 265 {
 266         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 267                 return 0;
 268         if (!(*flags & MS_RDONLY)) {
 269                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 270                 struct hfsplus_sb_info sbi;
 271
 272                 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
 273                 sbi.nls = HFSPLUS_SB(sb).nls;
 274                 if (!hfsplus_parse_options(data, &sbi))
 275                         return -EINVAL;
 276
 277                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 278                         printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
 279                                "running fsck.hfsplus is recommended.  leaving read-only.\n");
 280                         sb->s_flags |= MS_RDONLY;
 281                         *flags |= MS_RDONLY;
 282                 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
 283                         /* nothing */
 284                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 285                         printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
 286                         sb->s_flags |= MS_RDONLY;
 287                         *flags |= MS_RDONLY;
 288                 } else if (hfsplus_vol_has_journal(vhdr)) {
 289                         printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
 290                         sb->s_flags |= MS_RDONLY;
 291                         *flags |= MS_RDONLY;
 292                 }
 293         }
 294         return 0;
 295 }
 296
 297 static const struct super_operations hfsplus_sops = {
 298         .alloc_inode    = hfsplus_alloc_inode,
 299         .destroy_inode  = hfsplus_destroy_inode,
 300         .write_inode    = hfsplus_write_inode,
 301         .clear_inode    = hfsplus_clear_inode,
 302         .put_super      = hfsplus_put_super,
 303         .write_super    = hfsplus_write_super,
 304         .sync_fs        = hfsplus_sync_fs,
 305         .statfs         = hfsplus_statfs,
 306         .remount_fs     = hfsplus_remount,
 307         .show_options   = hfsplus_show_options,
 308 };
 309
 310 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 311 {
 312         struct hfsplus_vh *vhdr;
 313         struct hfsplus_sb_info *sbi;
 314         hfsplus_cat_entry entry;
 315         struct hfs_find_data fd;
 316         struct inode *root, *inode;
 317         struct qstr str;
 318         struct nls_table *nls = NULL;
 319         int err = -EINVAL;
 320
 321         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 322         if (!sbi)
 323                 return -ENOMEM;
 324
 325         sb->s_fs_info = sbi;
 326         INIT_HLIST_HEAD(&sbi->rsrc_inodes);
 327         hfsplus_fill_defaults(sbi);
 328         if (!hfsplus_parse_options(data, sbi)) {
 329                 printk(KERN_ERR "hfs: unable to parse mount options\n");
 330                 err = -EINVAL;
 331                 goto cleanup;
 332         }
 333
 334         /* temporarily use utf8 to correctly find the hidden dir below */
 335         nls = sbi->nls;
 336         sbi->nls = load_nls("utf8");
 337         if (!sbi->nls) {
 338                 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
 339                 err = -EINVAL;
 340                 goto cleanup;
 341         }
 342
 343         /* Grab the volume header */
 344         if (hfsplus_read_wrapper(sb)) {
 345                 if (!silent)
 346                         printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
 347                 err = -EINVAL;
 348                 goto cleanup;
 349         }
 350         vhdr = HFSPLUS_SB(sb).s_vhdr;
 351
 352         /* Copy parts of the volume header into the superblock */
 353         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 354         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 355             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 356                 printk(KERN_ERR "hfs: wrong filesystem version\n");
 357                 goto cleanup;
 358         }
 359         HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
 360         HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
 361         HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
 362         HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
 363         HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
 364         HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
 365         HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 366         if (!HFSPLUS_SB(sb).data_clump_blocks)
 367                 HFSPLUS_SB(sb).data_clump_blocks = 1;
 368         HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 369         if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
 370                 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
 371
 372         /* Set up operations so we can load metadata */
 373         sb->s_op = &hfsplus_sops;
 374         sb->s_maxbytes = MAX_LFS_FILESIZE;
 375
 376         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 377                 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
 378                        "running fsck.hfsplus is recommended.  mounting read-only.\n");
 379                 sb->s_flags |= MS_RDONLY;
 380         } else if (sbi->flags & HFSPLUS_SB_FORCE) {
 381                 /* nothing */
 382         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 383                 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
 384                 sb->s_flags |= MS_RDONLY;
 385         } else if (hfsplus_vol_has_journal(vhdr) && !(sb->s_flags & MS_RDONLY)) {
 386                 printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
 387                        "use the force option at your own risk, mounting read-only.\n");
 388                 sb->s_flags |= MS_RDONLY;
 389         }
 390         sbi->flags &= ~HFSPLUS_SB_FORCE;
 391
 392         /* Load metadata objects (B*Trees) */
 393         HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 394         if (!HFSPLUS_SB(sb).ext_tree) {
 395                 printk(KERN_ERR "hfs: failed to load extents file\n");
 396                 goto cleanup;
 397         }
 398         HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 399         if (!HFSPLUS_SB(sb).cat_tree) {
 400                 printk(KERN_ERR "hfs: failed to load catalog file\n");
 401                 goto cleanup;
 402         }
 403
 404         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 405         if (IS_ERR(inode)) {
 406                 printk(KERN_ERR "hfs: failed to load allocation file\n");
 407                 err = PTR_ERR(inode);
 408                 goto cleanup;
 409         }
 410         HFSPLUS_SB(sb).alloc_file = inode;
 411
 412         /* Load the root directory */
 413         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 414         if (IS_ERR(root)) {
 415                 printk(KERN_ERR "hfs: failed to load root directory\n");
 416                 err = PTR_ERR(root);
 417                 goto cleanup;
 418         }
 419         sb->s_root = d_alloc_root(root);
 420         if (!sb->s_root) {
 421                 iput(root);
 422                 err = -ENOMEM;
 423                 goto cleanup;
 424         }
 425         sb->s_root->d_op = &hfsplus_dentry_operations;
 426
 427         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 428         str.name = HFSP_HIDDENDIR_NAME;
 429         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 430         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 431         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 432                 hfs_find_exit(&fd);
 433                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 434                         goto cleanup;
 435                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 436                 if (IS_ERR(inode)) {
 437                         err = PTR_ERR(inode);
 438                         goto cleanup;
 439                 }
 440                 HFSPLUS_SB(sb).hidden_dir = inode;
 441         } else
 442                 hfs_find_exit(&fd);
 443
 444         if (sb->s_flags & MS_RDONLY)
 445                 goto out;
 446
 447         /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 448          * all three are registered with Apple for our use
 449          */
 450         vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 451         vhdr->modify_date = hfsp_now2mt();
 452         be32_add_cpu(&vhdr->write_count, 1);
 453         vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 454         vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 455         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 456         sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
 457
 458         if (!HFSPLUS_SB(sb).hidden_dir) {
 459                 printk(KERN_DEBUG "hfs: create hidden dir...\n");
 460                 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 461                 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
 462                                    &str, HFSPLUS_SB(sb).hidden_dir);
 463                 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
 464         }
 465 out:
 466         unload_nls(sbi->nls);
 467         sbi->nls = nls;
 468         return 0;
 469
 470 cleanup:
 471         hfsplus_put_super(sb);
 472         unload_nls(nls);
 473         return err;
 474 }
 475
 476 MODULE_AUTHOR("Brad Boyer");
 477 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 478 MODULE_LICENSE("GPL");
 479
 480 static struct kmem_cache *hfsplus_inode_cachep;
 481
 482 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 483 {
 484         struct hfsplus_inode_info *i;
 485
 486         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 487         return i ? &i->vfs_inode : NULL;
 488 }
 489
 490 static void hfsplus_destroy_inode(struct inode *inode)
 491 {
 492         kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
 493 }
 494
 495 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 496
 497 static int hfsplus_get_sb(struct file_system_type *fs_type,
 498                           int flags, const char *dev_name, void *data,
 499                           struct vfsmount *mnt)
 500 {
 501         return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
 502                            mnt);
 503 }
 504
 505 static struct file_system_type hfsplus_fs_type = {
 506         .owner          = THIS_MODULE,
 507         .name           = "hfsplus",
 508         .get_sb         = hfsplus_get_sb,
 509         .kill_sb        = kill_block_super,
 510         .fs_flags       = FS_REQUIRES_DEV,
 511 };
 512
 513 static void hfsplus_init_once(void *p)
 514 {
 515         struct hfsplus_inode_info *i = p;
 516
 517         inode_init_once(&i->vfs_inode);
 518 }
 519
 520 static int __init init_hfsplus_fs(void)
 521 {
 522         int err;
 523
 524         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 525                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 526                 hfsplus_init_once);
 527         if (!hfsplus_inode_cachep)
 528                 return -ENOMEM;
 529         err = register_filesystem(&hfsplus_fs_type);
 530         if (err)
 531                 kmem_cache_destroy(hfsplus_inode_cachep);
 532         return err;
 533 }
 534
 535 static void __exit exit_hfsplus_fs(void)
 536 {
 537         unregister_filesystem(&hfsplus_fs_type);
 538         kmem_cache_destroy(hfsplus_inode_cachep);
 539 }
 540
 541 module_init(init_hfsplus_fs)
 542 module_exit(exit_hfsplus_fs)