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/config.h>
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/pagemap.h>
  14 #include <linux/fs.h>
  15 #include <linux/sched.h>
  16 #include <linux/slab.h>
  17 #include <linux/vfs.h>
  18 #include <linux/nls.h>
  19
  20 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
  21 static void hfsplus_destroy_inode(struct inode *inode);
  22
  23 #include "hfsplus_fs.h"
  24
  25 void hfsplus_inode_check(struct super_block *sb)
  26 {
  27 #if 0
  28         u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt);
  29         u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt;
  30
  31         if (cnt <= (last_cnt / 2) ||
  32             cnt >= (last_cnt * 2)) {
  33                 HFSPLUS_SB(sb).last_inode_cnt = cnt;
  34                 printk("inode_check: %u,%u,%u\n", cnt, last_cnt,
  35                         HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0);
  36         }
  37 #endif
  38 }
  39
  40 static void hfsplus_read_inode(struct inode *inode)
  41 {
  42         struct hfs_find_data fd;
  43         struct hfsplus_vh *vhdr;
  44         int err;
  45
  46         atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt);
  47         hfsplus_inode_check(inode->i_sb);
  48         INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
  49         init_MUTEX(&HFSPLUS_I(inode).extents_lock);
  50         HFSPLUS_I(inode).flags = 0;
  51         HFSPLUS_I(inode).rsrc_inode = NULL;
  52         atomic_set(&HFSPLUS_I(inode).opencnt, 0);
  53
  54         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
  55         read_inode:
  56                 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
  57                 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
  58                 if (!err)
  59                         err = hfsplus_cat_read_inode(inode, &fd);
  60                 hfs_find_exit(&fd);
  61                 if (err)
  62                         goto bad_inode;
  63                 return;
  64         }
  65         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
  66         switch(inode->i_ino) {
  67         case HFSPLUS_ROOT_CNID:
  68                 goto read_inode;
  69         case HFSPLUS_EXT_CNID:
  70                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
  71                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  72                 break;
  73         case HFSPLUS_CAT_CNID:
  74                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
  75                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  76                 break;
  77         case HFSPLUS_ALLOC_CNID:
  78                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
  79                 inode->i_mapping->a_ops = &hfsplus_aops;
  80                 break;
  81         case HFSPLUS_START_CNID:
  82                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
  83                 break;
  84         case HFSPLUS_ATTR_CNID:
  85                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
  86                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  87                 break;
  88         default:
  89                 goto bad_inode;
  90         }
  91
  92         return;
  93
  94  bad_inode:
  95         make_bad_inode(inode);
  96 }
  97
  98 static int hfsplus_write_inode(struct inode *inode, int unused)
  99 {
 100         struct hfsplus_vh *vhdr;
 101         int ret = 0;
 102
 103         dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
 104         hfsplus_ext_write_extent(inode);
 105         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
 106                 return hfsplus_cat_write_inode(inode);
 107         }
 108         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
 109         switch (inode->i_ino) {
 110         case HFSPLUS_ROOT_CNID:
 111                 ret = hfsplus_cat_write_inode(inode);
 112                 break;
 113         case HFSPLUS_EXT_CNID:
 114                 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
 115                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 116                         inode->i_sb->s_dirt = 1;
 117                 }
 118                 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
 119                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
 120                 break;
 121         case HFSPLUS_CAT_CNID:
 122                 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
 123                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 124                         inode->i_sb->s_dirt = 1;
 125                 }
 126                 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
 127                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
 128                 break;
 129         case HFSPLUS_ALLOC_CNID:
 130                 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
 131                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 132                         inode->i_sb->s_dirt = 1;
 133                 }
 134                 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
 135                 break;
 136         case HFSPLUS_START_CNID:
 137                 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
 138                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 139                         inode->i_sb->s_dirt = 1;
 140                 }
 141                 hfsplus_inode_write_fork(inode, &vhdr->start_file);
 142                 break;
 143         case HFSPLUS_ATTR_CNID:
 144                 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
 145                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 146                         inode->i_sb->s_dirt = 1;
 147                 }
 148                 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
 149                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
 150                 break;
 151         }
 152         return ret;
 153 }
 154
 155 static void hfsplus_clear_inode(struct inode *inode)
 156 {
 157         dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
 158         atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt);
 159         if (HFSPLUS_IS_RSRC(inode)) {
 160                 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
 161                 iput(HFSPLUS_I(inode).rsrc_inode);
 162         }
 163         hfsplus_inode_check(inode->i_sb);
 164 }
 165
 166 static void hfsplus_write_super(struct super_block *sb)
 167 {
 168         struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 169
 170         dprint(DBG_SUPER, "hfsplus_write_super\n");
 171         sb->s_dirt = 0;
 172         if (sb->s_flags & MS_RDONLY)
 173                 /* warn? */
 174                 return;
 175
 176         vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
 177         vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
 178         vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
 179         vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
 180         vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
 181
 182         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 183         if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
 184                 if (HFSPLUS_SB(sb).sect_count) {
 185                         struct buffer_head *bh;
 186                         u32 block, offset;
 187
 188                         block = HFSPLUS_SB(sb).blockoffset;
 189                         block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
 190                         offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
 191                         printk("backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
 192                                 HFSPLUS_SB(sb).sect_count, block, offset);
 193                         bh = sb_bread(sb, block);
 194                         if (bh) {
 195                                 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
 196                                 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
 197                                         memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
 198                                         mark_buffer_dirty(bh);
 199                                         brelse(bh);
 200                                 } else
 201                                         printk("backup not found!\n");
 202                         }
 203                 }
 204                 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
 205         }
 206 }
 207
 208 static void hfsplus_put_super(struct super_block *sb)
 209 {
 210         dprint(DBG_SUPER, "hfsplus_put_super\n");
 211         if (!sb->s_fs_info)
 212                 return;
 213         if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
 214                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 215
 216                 vhdr->modify_date = hfsp_now2mt();
 217                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 218                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 219                 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 220                 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
 221         }
 222
 223         hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
 224         hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
 225         iput(HFSPLUS_SB(sb).alloc_file);
 226         iput(HFSPLUS_SB(sb).hidden_dir);
 227         brelse(HFSPLUS_SB(sb).s_vhbh);
 228         if (HFSPLUS_SB(sb).nls)
 229                 unload_nls(HFSPLUS_SB(sb).nls);
 230         kfree(sb->s_fs_info);
 231         sb->s_fs_info = NULL;
 232 }
 233
 234 static int hfsplus_statfs(struct super_block *sb, struct kstatfs *buf)
 235 {
 236         buf->f_type = HFSPLUS_SUPER_MAGIC;
 237         buf->f_bsize = sb->s_blocksize;
 238         buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
 239         buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
 240         buf->f_bavail = buf->f_bfree;
 241         buf->f_files = 0xFFFFFFFF;
 242         buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
 243         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 244
 245         return 0;
 246 }
 247
 248 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 249 {
 250         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 251                 return 0;
 252         if (!(*flags & MS_RDONLY)) {
 253                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 254                 struct hfsplus_sb_info sbi;
 255
 256                 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
 257                 sbi.nls = HFSPLUS_SB(sb).nls;
 258                 if (!hfsplus_parse_options(data, &sbi))
 259                         return -EINVAL;
 260
 261                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 262                         printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
 263                                "running fsck.hfsplus is recommended.  leaving read-only.\n");
 264                         sb->s_flags |= MS_RDONLY;
 265                         *flags |= MS_RDONLY;
 266                 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
 267                         /* nothing */
 268                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 269                         printk("HFS+-fs: Filesystem is marked locked, leaving read-only.\n");
 270                         sb->s_flags |= MS_RDONLY;
 271                         *flags |= MS_RDONLY;
 272                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 273                         printk("HFS+-fs: Filesystem is marked journaled, leaving read-only.\n");
 274                         sb->s_flags |= MS_RDONLY;
 275                         *flags |= MS_RDONLY;
 276                 }
 277         }
 278         return 0;
 279 }
 280
 281 static struct super_operations hfsplus_sops = {
 282         .alloc_inode    = hfsplus_alloc_inode,
 283         .destroy_inode  = hfsplus_destroy_inode,
 284         .read_inode     = hfsplus_read_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;
 301         struct qstr str;
 302         struct nls_table *nls = NULL;
 303         int err = -EINVAL;
 304
 305         sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
 306         if (!sbi)
 307                 return -ENOMEM;
 308
 309         memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
 310         sb->s_fs_info = sbi;
 311         INIT_HLIST_HEAD(&sbi->rsrc_inodes);
 312         hfsplus_fill_defaults(sbi);
 313         if (!hfsplus_parse_options(data, sbi)) {
 314                 if (!silent)
 315                         printk("HFS+-fs: unable to parse mount options\n");
 316                 err = -EINVAL;
 317                 goto cleanup;
 318         }
 319
 320         /* temporarily use utf8 to correctly find the hidden dir below */
 321         nls = sbi->nls;
 322         sbi->nls = load_nls("utf8");
 323         if (!nls) {
 324                 printk("HFS+: unable to load nls for utf8\n");
 325                 err = -EINVAL;
 326                 goto cleanup;
 327         }
 328
 329         /* Grab the volume header */
 330         if (hfsplus_read_wrapper(sb)) {
 331                 if (!silent)
 332                         printk("HFS+-fs: unable to find HFS+ superblock\n");
 333                 err = -EINVAL;
 334                 goto cleanup;
 335         }
 336         vhdr = HFSPLUS_SB(sb).s_vhdr;
 337
 338         /* Copy parts of the volume header into the superblock */
 339         sb->s_magic = be16_to_cpu(vhdr->signature);
 340         if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) {
 341                 if (!silent)
 342                         printk("HFS+-fs: wrong filesystem version\n");
 343                 goto cleanup;
 344         }
 345         HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
 346         HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
 347         HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
 348         HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
 349         HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
 350         HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
 351         HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 352         if (!HFSPLUS_SB(sb).data_clump_blocks)
 353                 HFSPLUS_SB(sb).data_clump_blocks = 1;
 354         HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 355         if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
 356                 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
 357
 358         /* Set up operations so we can load metadata */
 359         sb->s_op = &hfsplus_sops;
 360         sb->s_maxbytes = MAX_LFS_FILESIZE;
 361
 362         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 363                 if (!silent)
 364                         printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
 365                                "running fsck.hfsplus is recommended.  mounting read-only.\n");
 366                 sb->s_flags |= MS_RDONLY;
 367         } else if (sbi->flags & HFSPLUS_SB_FORCE) {
 368                 /* nothing */
 369         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 370                 if (!silent)
 371                         printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
 372                 sb->s_flags |= MS_RDONLY;
 373         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 374                 if (!silent)
 375                         printk("HFS+-fs: write access to a jounaled filesystem is not supported, "
 376                                "use the force option at your own risk, mounting read-only.\n");
 377                 sb->s_flags |= MS_RDONLY;
 378         }
 379         sbi->flags &= ~HFSPLUS_SB_FORCE;
 380
 381         /* Load metadata objects (B*Trees) */
 382         HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 383         if (!HFSPLUS_SB(sb).ext_tree) {
 384                 if (!silent)
 385                         printk("HFS+-fs: failed to load extents file\n");
 386                 goto cleanup;
 387         }
 388         HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 389         if (!HFSPLUS_SB(sb).cat_tree) {
 390                 if (!silent)
 391                         printk("HFS+-fs: failed to load catalog file\n");
 392                 goto cleanup;
 393         }
 394
 395         HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
 396         if (!HFSPLUS_SB(sb).alloc_file) {
 397                 if (!silent)
 398                         printk("HFS+-fs: failed to load allocation file\n");
 399                 goto cleanup;
 400         }
 401
 402         /* Load the root directory */
 403         root = iget(sb, HFSPLUS_ROOT_CNID);
 404         sb->s_root = d_alloc_root(root);
 405         if (!sb->s_root) {
 406                 if (!silent)
 407                         printk("HFS+-fs: failed to load root directory\n");
 408                 iput(root);
 409                 goto cleanup;
 410         }
 411
 412         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 413         str.name = HFSP_HIDDENDIR_NAME;
 414         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 415         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 416         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 417                 hfs_find_exit(&fd);
 418                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 419                         goto cleanup;
 420                 HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
 421                 if (!HFSPLUS_SB(sb).hidden_dir)
 422                         goto cleanup;
 423         } else
 424                 hfs_find_exit(&fd);
 425
 426         if (sb->s_flags & MS_RDONLY)
 427                 goto out;
 428
 429         /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 430          * all three are registered with Apple for our use
 431          */
 432         vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 433         vhdr->modify_date = hfsp_now2mt();
 434         vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
 435         vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 436         vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 437         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 438         sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
 439
 440         if (!HFSPLUS_SB(sb).hidden_dir) {
 441                 printk("HFS+: create hidden dir...\n");
 442                 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 443                 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
 444                                    &str, HFSPLUS_SB(sb).hidden_dir);
 445                 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
 446         }
 447 out:
 448         unload_nls(sbi->nls);
 449         sbi->nls = nls;
 450         return 0;
 451
 452 cleanup:
 453         hfsplus_put_super(sb);
 454         if (nls)
 455                 unload_nls(nls);
 456         return err;
 457 }
 458
 459 MODULE_AUTHOR("Brad Boyer");
 460 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 461 MODULE_LICENSE("GPL");
 462
 463 static kmem_cache_t *hfsplus_inode_cachep;
 464
 465 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 466 {
 467         struct hfsplus_inode_info *i;
 468
 469         i = kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL);
 470         return i ? &i->vfs_inode : NULL;
 471 }
 472
 473 static void hfsplus_destroy_inode(struct inode *inode)
 474 {
 475         kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
 476 }
 477
 478 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 479
 480 static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type,
 481                                           int flags, const char *dev_name, void *data)
 482 {
 483         return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
 484 }
 485
 486 static struct file_system_type hfsplus_fs_type = {
 487         .owner          = THIS_MODULE,
 488         .name           = "hfsplus",
 489         .get_sb         = hfsplus_get_sb,
 490         .kill_sb        = kill_block_super,
 491         .fs_flags       = FS_REQUIRES_DEV,
 492 };
 493
 494 static void hfsplus_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
 495 {
 496         struct hfsplus_inode_info *i = p;
 497
 498         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
 499                 inode_init_once(&i->vfs_inode);
 500 }
 501
 502 static int __init init_hfsplus_fs(void)
 503 {
 504         int err;
 505
 506         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 507                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 508                 hfsplus_init_once, NULL);
 509         if (!hfsplus_inode_cachep)
 510                 return -ENOMEM;
 511         err = register_filesystem(&hfsplus_fs_type);
 512         if (err)
 513                 kmem_cache_destroy(hfsplus_inode_cachep);
 514         return err;
 515 }
 516
 517 static void __exit exit_hfsplus_fs(void)
 518 {
 519         unregister_filesystem(&hfsplus_fs_type);
 520         if (kmem_cache_destroy(hfsplus_inode_cachep))
 521                 printk(KERN_INFO "hfsplus_inode_cache: not all structures were freed\n");
 522 }
 523
 524 module_init(init_hfsplus_fs)
 525 module_exit(exit_hfsplus_fs)