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 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
  25 {
  26         struct hfs_find_data fd;
  27         struct hfsplus_vh *vhdr;
  28         struct inode *inode;
  29         long err = -EIO;
  30
  31         inode = iget_locked(sb, ino);
  32         if (!inode)
  33                 return ERR_PTR(-ENOMEM);
  34         if (!(inode->i_state & I_NEW))
  35                 return inode;
  36
  37         INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
  38         mutex_init(&HFSPLUS_I(inode).extents_lock);
  39         HFSPLUS_I(inode).flags = 0;
  40         HFSPLUS_I(inode).rsrc_inode = NULL;
  41         atomic_set(&HFSPLUS_I(inode).opencnt, 0);
  42
  43         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
  44         read_inode:
  45                 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
  46                 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
  47                 if (!err)
  48                         err = hfsplus_cat_read_inode(inode, &fd);
  49                 hfs_find_exit(&fd);
  50                 if (err)
  51                         goto bad_inode;
  52                 goto done;
  53         }
  54         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
  55         switch(inode->i_ino) {
  56         case HFSPLUS_ROOT_CNID:
  57                 goto read_inode;
  58         case HFSPLUS_EXT_CNID:
  59                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
  60                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  61                 break;
  62         case HFSPLUS_CAT_CNID:
  63                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
  64                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  65                 break;
  66         case HFSPLUS_ALLOC_CNID:
  67                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
  68                 inode->i_mapping->a_ops = &hfsplus_aops;
  69                 break;
  70         case HFSPLUS_START_CNID:
  71                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
  72                 break;
  73         case HFSPLUS_ATTR_CNID:
  74                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
  75                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  76                 break;
  77         default:
  78                 goto bad_inode;
  79         }
  80
  81 done:
  82         unlock_new_inode(inode);
  83         return inode;
  84
  85 bad_inode:
  86         iget_failed(inode);
  87         return ERR_PTR(err);
  88 }
  89
  90 static int hfsplus_write_inode(struct inode *inode,
  91                 struct writeback_control *wbc)
  92 {
  93         struct hfsplus_vh *vhdr;
  94         int ret = 0;
  95
  96         dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
  97         hfsplus_ext_write_extent(inode);
  98         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
  99                 return hfsplus_cat_write_inode(inode);
 100         }
 101         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
 102         switch (inode->i_ino) {
 103         case HFSPLUS_ROOT_CNID:
 104                 ret = hfsplus_cat_write_inode(inode);
 105                 break;
 106         case HFSPLUS_EXT_CNID:
 107                 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
 108                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 109                         inode->i_sb->s_dirt = 1;
 110                 }
 111                 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
 112                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
 113                 break;
 114         case HFSPLUS_CAT_CNID:
 115                 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
 116                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 117                         inode->i_sb->s_dirt = 1;
 118                 }
 119                 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
 120                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
 121                 break;
 122         case HFSPLUS_ALLOC_CNID:
 123                 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
 124                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 125                         inode->i_sb->s_dirt = 1;
 126                 }
 127                 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
 128                 break;
 129         case HFSPLUS_START_CNID:
 130                 if (vhdr->start_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->start_file);
 135                 break;
 136         case HFSPLUS_ATTR_CNID:
 137                 if (vhdr->attr_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->attr_file);
 142                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
 143                 break;
 144         }
 145         return ret;
 146 }
 147
 148 static void hfsplus_evict_inode(struct inode *inode)
 149 {
 150         dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
 151         truncate_inode_pages(&inode->i_data, 0);
 152         end_writeback(inode);
 153         if (HFSPLUS_IS_RSRC(inode)) {
 154                 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
 155                 iput(HFSPLUS_I(inode).rsrc_inode);
 156         }
 157 }
 158
 159 int hfsplus_sync_fs(struct super_block *sb, int wait)
 160 {
 161         struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 162
 163         dprint(DBG_SUPER, "hfsplus_write_super\n");
 164
 165         lock_super(sb);
 166         sb->s_dirt = 0;
 167
 168         vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
 169         vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
 170         vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
 171         vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
 172         vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
 173
 174         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 175         if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
 176                 if (HFSPLUS_SB(sb).sect_count) {
 177                         struct buffer_head *bh;
 178                         u32 block, offset;
 179
 180                         block = HFSPLUS_SB(sb).blockoffset;
 181                         block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
 182                         offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
 183                         printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
 184                                 HFSPLUS_SB(sb).sect_count, block, offset);
 185                         bh = sb_bread(sb, block);
 186                         if (bh) {
 187                                 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
 188                                 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
 189                                         memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
 190                                         mark_buffer_dirty(bh);
 191                                         brelse(bh);
 192                                 } else
 193                                         printk(KERN_WARNING "hfs: backup not found!\n");
 194                         }
 195                 }
 196                 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
 197         }
 198         unlock_super(sb);
 199         return 0;
 200 }
 201
 202 static void hfsplus_write_super(struct super_block *sb)
 203 {
 204         if (!(sb->s_flags & MS_RDONLY))
 205                 hfsplus_sync_fs(sb, 1);
 206         else
 207                 sb->s_dirt = 0;
 208 }
 209
 210 static void hfsplus_put_super(struct super_block *sb)
 211 {
 212         dprint(DBG_SUPER, "hfsplus_put_super\n");
 213         if (!sb->s_fs_info)
 214                 return;
 215
 216         lock_kernel();
 217
 218         if (sb->s_dirt)
 219                 hfsplus_write_super(sb);
 220         if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
 221                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 222
 223                 vhdr->modify_date = hfsp_now2mt();
 224                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 225                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 226                 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 227                 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
 228         }
 229
 230         hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
 231         hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
 232         iput(HFSPLUS_SB(sb).alloc_file);
 233         iput(HFSPLUS_SB(sb).hidden_dir);
 234         brelse(HFSPLUS_SB(sb).s_vhbh);
 235         unload_nls(HFSPLUS_SB(sb).nls);
 236         kfree(sb->s_fs_info);
 237         sb->s_fs_info = NULL;
 238
 239         unlock_kernel();
 240 }
 241
 242 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 243 {
 244         struct super_block *sb = dentry->d_sb;
 245         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 246
 247         buf->f_type = HFSPLUS_SUPER_MAGIC;
 248         buf->f_bsize = sb->s_blocksize;
 249         buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
 250         buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
 251         buf->f_bavail = buf->f_bfree;
 252         buf->f_files = 0xFFFFFFFF;
 253         buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
 254         buf->f_fsid.val[0] = (u32)id;
 255         buf->f_fsid.val[1] = (u32)(id >> 32);
 256         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 257
 258         return 0;
 259 }
 260
 261 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 262 {
 263         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 264                 return 0;
 265         if (!(*flags & MS_RDONLY)) {
 266                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 267                 struct hfsplus_sb_info sbi;
 268
 269                 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
 270                 sbi.nls = HFSPLUS_SB(sb).nls;
 271                 if (!hfsplus_parse_options(data, &sbi))
 272                         return -EINVAL;
 273
 274                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 275                         printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
 276                                "running fsck.hfsplus is recommended.  leaving read-only.\n");
 277                         sb->s_flags |= MS_RDONLY;
 278                         *flags |= MS_RDONLY;
 279                 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
 280                         /* nothing */
 281                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 282                         printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
 283                         sb->s_flags |= MS_RDONLY;
 284                         *flags |= MS_RDONLY;
 285                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 286                         printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
 287                         sb->s_flags |= MS_RDONLY;
 288                         *flags |= MS_RDONLY;
 289                 }
 290         }
 291         return 0;
 292 }
 293
 294 static const struct super_operations hfsplus_sops = {
 295         .alloc_inode    = hfsplus_alloc_inode,
 296         .destroy_inode  = hfsplus_destroy_inode,
 297         .write_inode    = hfsplus_write_inode,
 298         .evict_inode    = hfsplus_evict_inode,
 299         .put_super      = hfsplus_put_super,
 300         .write_super    = hfsplus_write_super,
 301         .sync_fs        = hfsplus_sync_fs,
 302         .statfs         = hfsplus_statfs,
 303         .remount_fs     = hfsplus_remount,
 304         .show_options   = hfsplus_show_options,
 305 };
 306
 307 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 308 {
 309         struct hfsplus_vh *vhdr;
 310         struct hfsplus_sb_info *sbi;
 311         hfsplus_cat_entry entry;
 312         struct hfs_find_data fd;
 313         struct inode *root, *inode;
 314         struct qstr str;
 315         struct nls_table *nls = NULL;
 316         int err = -EINVAL;
 317
 318         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 319         if (!sbi)
 320                 return -ENOMEM;
 321
 322         sb->s_fs_info = sbi;
 323         INIT_HLIST_HEAD(&sbi->rsrc_inodes);
 324         hfsplus_fill_defaults(sbi);
 325         if (!hfsplus_parse_options(data, sbi)) {
 326                 printk(KERN_ERR "hfs: unable to parse mount options\n");
 327                 err = -EINVAL;
 328                 goto cleanup;
 329         }
 330
 331         /* temporarily use utf8 to correctly find the hidden dir below */
 332         nls = sbi->nls;
 333         sbi->nls = load_nls("utf8");
 334         if (!sbi->nls) {
 335                 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
 336                 err = -EINVAL;
 337                 goto cleanup;
 338         }
 339
 340         /* Grab the volume header */
 341         if (hfsplus_read_wrapper(sb)) {
 342                 if (!silent)
 343                         printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
 344                 err = -EINVAL;
 345                 goto cleanup;
 346         }
 347         vhdr = HFSPLUS_SB(sb).s_vhdr;
 348
 349         /* Copy parts of the volume header into the superblock */
 350         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 351         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 352             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 353                 printk(KERN_ERR "hfs: wrong filesystem version\n");
 354                 goto cleanup;
 355         }
 356         HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
 357         HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
 358         HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
 359         HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
 360         HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
 361         HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
 362         HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 363         if (!HFSPLUS_SB(sb).data_clump_blocks)
 364                 HFSPLUS_SB(sb).data_clump_blocks = 1;
 365         HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 366         if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
 367                 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
 368
 369         /* Set up operations so we can load metadata */
 370         sb->s_op = &hfsplus_sops;
 371         sb->s_maxbytes = MAX_LFS_FILESIZE;
 372
 373         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 374                 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
 375                        "running fsck.hfsplus is recommended.  mounting read-only.\n");
 376                 sb->s_flags |= MS_RDONLY;
 377         } else if (sbi->flags & HFSPLUS_SB_FORCE) {
 378                 /* nothing */
 379         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 380                 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
 381                 sb->s_flags |= MS_RDONLY;
 382         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) {
 383                 printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
 384                        "use the force option at your own risk, mounting read-only.\n");
 385                 sb->s_flags |= MS_RDONLY;
 386         }
 387         sbi->flags &= ~HFSPLUS_SB_FORCE;
 388
 389         /* Load metadata objects (B*Trees) */
 390         HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 391         if (!HFSPLUS_SB(sb).ext_tree) {
 392                 printk(KERN_ERR "hfs: failed to load extents file\n");
 393                 goto cleanup;
 394         }
 395         HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 396         if (!HFSPLUS_SB(sb).cat_tree) {
 397                 printk(KERN_ERR "hfs: failed to load catalog file\n");
 398                 goto cleanup;
 399         }
 400
 401         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 402         if (IS_ERR(inode)) {
 403                 printk(KERN_ERR "hfs: failed to load allocation file\n");
 404                 err = PTR_ERR(inode);
 405                 goto cleanup;
 406         }
 407         HFSPLUS_SB(sb).alloc_file = inode;
 408
 409         /* Load the root directory */
 410         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 411         if (IS_ERR(root)) {
 412                 printk(KERN_ERR "hfs: failed to load root directory\n");
 413                 err = PTR_ERR(root);
 414                 goto cleanup;
 415         }
 416         sb->s_root = d_alloc_root(root);
 417         if (!sb->s_root) {
 418                 iput(root);
 419                 err = -ENOMEM;
 420                 goto cleanup;
 421         }
 422         sb->s_root->d_op = &hfsplus_dentry_operations;
 423
 424         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 425         str.name = HFSP_HIDDENDIR_NAME;
 426         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 427         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 428         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 429                 hfs_find_exit(&fd);
 430                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 431                         goto cleanup;
 432                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 433                 if (IS_ERR(inode)) {
 434                         err = PTR_ERR(inode);
 435                         goto cleanup;
 436                 }
 437                 HFSPLUS_SB(sb).hidden_dir = inode;
 438         } else
 439                 hfs_find_exit(&fd);
 440
 441         if (sb->s_flags & MS_RDONLY)
 442                 goto out;
 443
 444         /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 445          * all three are registered with Apple for our use
 446          */
 447         vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 448         vhdr->modify_date = hfsp_now2mt();
 449         be32_add_cpu(&vhdr->write_count, 1);
 450         vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 451         vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 452         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 453         sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
 454
 455         if (!HFSPLUS_SB(sb).hidden_dir) {
 456                 printk(KERN_DEBUG "hfs: create hidden dir...\n");
 457                 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 458                 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
 459                                    &str, HFSPLUS_SB(sb).hidden_dir);
 460                 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
 461         }
 462 out:
 463         unload_nls(sbi->nls);
 464         sbi->nls = nls;
 465         return 0;
 466
 467 cleanup:
 468         hfsplus_put_super(sb);
 469         unload_nls(nls);
 470         return err;
 471 }
 472
 473 MODULE_AUTHOR("Brad Boyer");
 474 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 475 MODULE_LICENSE("GPL");
 476
 477 static struct kmem_cache *hfsplus_inode_cachep;
 478
 479 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 480 {
 481         struct hfsplus_inode_info *i;
 482
 483         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 484         return i ? &i->vfs_inode : NULL;
 485 }
 486
 487 static void hfsplus_destroy_inode(struct inode *inode)
 488 {
 489         kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
 490 }
 491
 492 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 493
 494 static int hfsplus_get_sb(struct file_system_type *fs_type,
 495                           int flags, const char *dev_name, void *data,
 496                           struct vfsmount *mnt)
 497 {
 498         return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
 499                            mnt);
 500 }
 501
 502 static struct file_system_type hfsplus_fs_type = {
 503         .owner          = THIS_MODULE,
 504         .name           = "hfsplus",
 505         .get_sb         = hfsplus_get_sb,
 506         .kill_sb        = kill_block_super,
 507         .fs_flags       = FS_REQUIRES_DEV,
 508 };
 509
 510 static void hfsplus_init_once(void *p)
 511 {
 512         struct hfsplus_inode_info *i = p;
 513
 514         inode_init_once(&i->vfs_inode);
 515 }
 516
 517 static int __init init_hfsplus_fs(void)
 518 {
 519         int err;
 520
 521         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 522                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 523                 hfsplus_init_once);
 524         if (!hfsplus_inode_cachep)
 525                 return -ENOMEM;
 526         err = register_filesystem(&hfsplus_fs_type);
 527         if (err)
 528                 kmem_cache_destroy(hfsplus_inode_cachep);
 529         return err;
 530 }
 531
 532 static void __exit exit_hfsplus_fs(void)
 533 {
 534         unregister_filesystem(&hfsplus_fs_type);
 535         kmem_cache_destroy(hfsplus_inode_cachep);
 536 }
 537
 538 module_init(init_hfsplus_fs)
 539 module_exit(exit_hfsplus_fs)