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, int unused)
  91 {
  92         struct hfsplus_vh *vhdr;
  93         int ret = 0;
  94
  95         dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
  96         hfsplus_ext_write_extent(inode);
  97         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
  98                 return hfsplus_cat_write_inode(inode);
  99         }
 100         vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
 101         switch (inode->i_ino) {
 102         case HFSPLUS_ROOT_CNID:
 103                 ret = hfsplus_cat_write_inode(inode);
 104                 break;
 105         case HFSPLUS_EXT_CNID:
 106                 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
 107                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 108                         inode->i_sb->s_dirt = 1;
 109                 }
 110                 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
 111                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
 112                 break;
 113         case HFSPLUS_CAT_CNID:
 114                 if (vhdr->cat_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->cat_file);
 119                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
 120                 break;
 121         case HFSPLUS_ALLOC_CNID:
 122                 if (vhdr->alloc_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->alloc_file);
 127                 break;
 128         case HFSPLUS_START_CNID:
 129                 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
 130                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 131                         inode->i_sb->s_dirt = 1;
 132                 }
 133                 hfsplus_inode_write_fork(inode, &vhdr->start_file);
 134                 break;
 135         case HFSPLUS_ATTR_CNID:
 136                 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
 137                         HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
 138                         inode->i_sb->s_dirt = 1;
 139                 }
 140                 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
 141                 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
 142                 break;
 143         }
 144         return ret;
 145 }
 146
 147 static void hfsplus_clear_inode(struct inode *inode)
 148 {
 149         dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
 150         if (HFSPLUS_IS_RSRC(inode)) {
 151                 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
 152                 iput(HFSPLUS_I(inode).rsrc_inode);
 153         }
 154 }
 155
 156 static int hfsplus_sync_fs(struct super_block *sb, int wait)
 157 {
 158         struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 159
 160         dprint(DBG_SUPER, "hfsplus_write_super\n");
 161
 162         lock_super(sb);
 163         sb->s_dirt = 0;
 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         unlock_super(sb);
 196         return 0;
 197 }
 198
 199 static void hfsplus_write_super(struct super_block *sb)
 200 {
 201         if (!(sb->s_flags & MS_RDONLY))
 202                 hfsplus_sync_fs(sb, 1);
 203         else
 204                 sb->s_dirt = 0;
 205 }
 206
 207 static void hfsplus_put_super(struct super_block *sb)
 208 {
 209         dprint(DBG_SUPER, "hfsplus_put_super\n");
 210         if (!sb->s_fs_info)
 211                 return;
 212
 213         lock_kernel();
 214
 215         if (sb->s_dirt)
 216                 hfsplus_write_super(sb);
 217         if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
 218                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 219
 220                 vhdr->modify_date = hfsp_now2mt();
 221                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 222                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 223                 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 224                 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
 225         }
 226
 227         hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
 228         hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
 229         iput(HFSPLUS_SB(sb).alloc_file);
 230         iput(HFSPLUS_SB(sb).hidden_dir);
 231         brelse(HFSPLUS_SB(sb).s_vhbh);
 232         if (HFSPLUS_SB(sb).nls)
 233                 unload_nls(HFSPLUS_SB(sb).nls);
 234         kfree(sb->s_fs_info);
 235         sb->s_fs_info = NULL;
 236
 237         unlock_kernel();
 238 }
 239
 240 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 241 {
 242         struct super_block *sb = dentry->d_sb;
 243         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 244
 245         buf->f_type = HFSPLUS_SUPER_MAGIC;
 246         buf->f_bsize = sb->s_blocksize;
 247         buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
 248         buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
 249         buf->f_bavail = buf->f_bfree;
 250         buf->f_files = 0xFFFFFFFF;
 251         buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
 252         buf->f_fsid.val[0] = (u32)id;
 253         buf->f_fsid.val[1] = (u32)(id >> 32);
 254         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 255
 256         return 0;
 257 }
 258
 259 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 260 {
 261         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 262                 return 0;
 263         if (!(*flags & MS_RDONLY)) {
 264                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
 265                 struct hfsplus_sb_info sbi;
 266
 267                 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
 268                 sbi.nls = HFSPLUS_SB(sb).nls;
 269                 if (!hfsplus_parse_options(data, &sbi))
 270                         return -EINVAL;
 271
 272                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 273                         printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
 274                                "running fsck.hfsplus is recommended.  leaving read-only.\n");
 275                         sb->s_flags |= MS_RDONLY;
 276                         *flags |= MS_RDONLY;
 277                 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
 278                         /* nothing */
 279                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 280                         printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
 281                         sb->s_flags |= MS_RDONLY;
 282                         *flags |= MS_RDONLY;
 283                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 284                         printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
 285                         sb->s_flags |= MS_RDONLY;
 286                         *flags |= MS_RDONLY;
 287                 }
 288         }
 289         return 0;
 290 }
 291
 292 static const struct super_operations hfsplus_sops = {
 293         .alloc_inode    = hfsplus_alloc_inode,
 294         .destroy_inode  = hfsplus_destroy_inode,
 295         .write_inode    = hfsplus_write_inode,
 296         .clear_inode    = hfsplus_clear_inode,
 297         .put_super      = hfsplus_put_super,
 298         .write_super    = hfsplus_write_super,
 299         .sync_fs        = hfsplus_sync_fs,
 300         .statfs         = hfsplus_statfs,
 301         .remount_fs     = hfsplus_remount,
 302         .show_options   = hfsplus_show_options,
 303 };
 304
 305 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 306 {
 307         struct hfsplus_vh *vhdr;
 308         struct hfsplus_sb_info *sbi;
 309         hfsplus_cat_entry entry;
 310         struct hfs_find_data fd;
 311         struct inode *root, *inode;
 312         struct qstr str;
 313         struct nls_table *nls = NULL;
 314         int err = -EINVAL;
 315
 316         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 317         if (!sbi)
 318                 return -ENOMEM;
 319
 320         sb->s_fs_info = sbi;
 321         INIT_HLIST_HEAD(&sbi->rsrc_inodes);
 322         hfsplus_fill_defaults(sbi);
 323         if (!hfsplus_parse_options(data, sbi)) {
 324                 printk(KERN_ERR "hfs: unable to parse mount options\n");
 325                 err = -EINVAL;
 326                 goto cleanup;
 327         }
 328
 329         /* temporarily use utf8 to correctly find the hidden dir below */
 330         nls = sbi->nls;
 331         sbi->nls = load_nls("utf8");
 332         if (!sbi->nls) {
 333                 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
 334                 err = -EINVAL;
 335                 goto cleanup;
 336         }
 337
 338         /* Grab the volume header */
 339         if (hfsplus_read_wrapper(sb)) {
 340                 if (!silent)
 341                         printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
 342                 err = -EINVAL;
 343                 goto cleanup;
 344         }
 345         vhdr = HFSPLUS_SB(sb).s_vhdr;
 346
 347         /* Copy parts of the volume header into the superblock */
 348         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 349         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 350             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 351                 printk(KERN_ERR "hfs: wrong filesystem version\n");
 352                 goto cleanup;
 353         }
 354         HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
 355         HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
 356         HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
 357         HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
 358         HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
 359         HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
 360         HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 361         if (!HFSPLUS_SB(sb).data_clump_blocks)
 362                 HFSPLUS_SB(sb).data_clump_blocks = 1;
 363         HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
 364         if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
 365                 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
 366
 367         /* Set up operations so we can load metadata */
 368         sb->s_op = &hfsplus_sops;
 369         sb->s_maxbytes = MAX_LFS_FILESIZE;
 370
 371         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 372                 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
 373                        "running fsck.hfsplus is recommended.  mounting read-only.\n");
 374                 sb->s_flags |= MS_RDONLY;
 375         } else if (sbi->flags & HFSPLUS_SB_FORCE) {
 376                 /* nothing */
 377         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 378                 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
 379                 sb->s_flags |= MS_RDONLY;
 380         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) {
 381                 printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
 382                        "use the force option at your own risk, mounting read-only.\n");
 383                 sb->s_flags |= MS_RDONLY;
 384         }
 385         sbi->flags &= ~HFSPLUS_SB_FORCE;
 386
 387         /* Load metadata objects (B*Trees) */
 388         HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 389         if (!HFSPLUS_SB(sb).ext_tree) {
 390                 printk(KERN_ERR "hfs: failed to load extents file\n");
 391                 goto cleanup;
 392         }
 393         HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 394         if (!HFSPLUS_SB(sb).cat_tree) {
 395                 printk(KERN_ERR "hfs: failed to load catalog file\n");
 396                 goto cleanup;
 397         }
 398
 399         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 400         if (IS_ERR(inode)) {
 401                 printk(KERN_ERR "hfs: failed to load allocation file\n");
 402                 err = PTR_ERR(inode);
 403                 goto cleanup;
 404         }
 405         HFSPLUS_SB(sb).alloc_file = inode;
 406
 407         /* Load the root directory */
 408         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 409         if (IS_ERR(root)) {
 410                 printk(KERN_ERR "hfs: failed to load root directory\n");
 411                 err = PTR_ERR(root);
 412                 goto cleanup;
 413         }
 414         sb->s_root = d_alloc_root(root);
 415         if (!sb->s_root) {
 416                 iput(root);
 417                 err = -ENOMEM;
 418                 goto cleanup;
 419         }
 420         sb->s_root->d_op = &hfsplus_dentry_operations;
 421
 422         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 423         str.name = HFSP_HIDDENDIR_NAME;
 424         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 425         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 426         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 427                 hfs_find_exit(&fd);
 428                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 429                         goto cleanup;
 430                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 431                 if (IS_ERR(inode)) {
 432                         err = PTR_ERR(inode);
 433                         goto cleanup;
 434                 }
 435                 HFSPLUS_SB(sb).hidden_dir = inode;
 436         } else
 437                 hfs_find_exit(&fd);
 438
 439         if (sb->s_flags & MS_RDONLY)
 440                 goto out;
 441
 442         /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 443          * all three are registered with Apple for our use
 444          */
 445         vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 446         vhdr->modify_date = hfsp_now2mt();
 447         be32_add_cpu(&vhdr->write_count, 1);
 448         vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 449         vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 450         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
 451         sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
 452
 453         if (!HFSPLUS_SB(sb).hidden_dir) {
 454                 printk(KERN_DEBUG "hfs: create hidden dir...\n");
 455                 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 456                 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
 457                                    &str, HFSPLUS_SB(sb).hidden_dir);
 458                 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
 459         }
 460 out:
 461         unload_nls(sbi->nls);
 462         sbi->nls = nls;
 463         return 0;
 464
 465 cleanup:
 466         hfsplus_put_super(sb);
 467         if (nls)
 468                 unload_nls(nls);
 469         return err;
 470 }
 471
 472 MODULE_AUTHOR("Brad Boyer");
 473 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 474 MODULE_LICENSE("GPL");
 475
 476 static struct kmem_cache *hfsplus_inode_cachep;
 477
 478 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 479 {
 480         struct hfsplus_inode_info *i;
 481
 482         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 483         return i ? &i->vfs_inode : NULL;
 484 }
 485
 486 static void hfsplus_destroy_inode(struct inode *inode)
 487 {
 488         kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
 489 }
 490
 491 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 492
 493 static int hfsplus_get_sb(struct file_system_type *fs_type,
 494                           int flags, const char *dev_name, void *data,
 495                           struct vfsmount *mnt)
 496 {
 497         return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
 498                            mnt);
 499 }
 500
 501 static struct file_system_type hfsplus_fs_type = {
 502         .owner          = THIS_MODULE,
 503         .name           = "hfsplus",
 504         .get_sb         = hfsplus_get_sb,
 505         .kill_sb        = kill_block_super,
 506         .fs_flags       = FS_REQUIRES_DEV,
 507 };
 508
 509 static void hfsplus_init_once(void *p)
 510 {
 511         struct hfsplus_inode_info *i = p;
 512
 513         inode_init_once(&i->vfs_inode);
 514 }
 515
 516 static int __init init_hfsplus_fs(void)
 517 {
 518         int err;
 519
 520         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 521                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 522                 hfsplus_init_once);
 523         if (!hfsplus_inode_cachep)
 524                 return -ENOMEM;
 525         err = register_filesystem(&hfsplus_fs_type);
 526         if (err)
 527                 kmem_cache_destroy(hfsplus_inode_cachep);
 528         return err;
 529 }
 530
 531 static void __exit exit_hfsplus_fs(void)
 532 {
 533         unregister_filesystem(&hfsplus_fs_type);
 534         kmem_cache_destroy(hfsplus_inode_cachep);
 535 }
 536
 537 module_init(init_hfsplus_fs)
 538 module_exit(exit_hfsplus_fs)