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/blkdev.h>
  14 #include <linux/fs.h>
  15 #include <linux/slab.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 int hfsplus_system_read_inode(struct inode *inode)
  25 {
  26         struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
  27
  28         switch (inode->i_ino) {
  29         case HFSPLUS_EXT_CNID:
  30                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
  31                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  32                 break;
  33         case HFSPLUS_CAT_CNID:
  34                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
  35                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  36                 break;
  37         case HFSPLUS_ALLOC_CNID:
  38                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
  39                 inode->i_mapping->a_ops = &hfsplus_aops;
  40                 break;
  41         case HFSPLUS_START_CNID:
  42                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
  43                 break;
  44         case HFSPLUS_ATTR_CNID:
  45                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
  46                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  47                 break;
  48         default:
  49                 return -EIO;
  50         }
  51
  52         return 0;
  53 }
  54
  55 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
  56 {
  57         struct hfs_find_data fd;
  58         struct inode *inode;
  59         int err;
  60
  61         inode = iget_locked(sb, ino);
  62         if (!inode)
  63                 return ERR_PTR(-ENOMEM);
  64         if (!(inode->i_state & I_NEW))
  65                 return inode;
  66
  67         INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
  68         mutex_init(&HFSPLUS_I(inode)->extents_lock);
  69         HFSPLUS_I(inode)->flags = 0;
  70         HFSPLUS_I(inode)->extent_state = 0;
  71         HFSPLUS_I(inode)->rsrc_inode = NULL;
  72         atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
  73
  74         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
  75             inode->i_ino == HFSPLUS_ROOT_CNID) {
  76                 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
  77                 if (!err) {
  78                         err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
  79                         if (!err)
  80                                 err = hfsplus_cat_read_inode(inode, &fd);
  81                         hfs_find_exit(&fd);
  82                 }
  83         } else {
  84                 err = hfsplus_system_read_inode(inode);
  85         }
  86
  87         if (err) {
  88                 iget_failed(inode);
  89                 return ERR_PTR(err);
  90         }
  91
  92         unlock_new_inode(inode);
  93         return inode;
  94 }
  95
  96 static int hfsplus_system_write_inode(struct inode *inode)
  97 {
  98         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
  99         struct hfsplus_vh *vhdr = sbi->s_vhdr;
 100         struct hfsplus_fork_raw *fork;
 101         struct hfs_btree *tree = NULL;
 102
 103         switch (inode->i_ino) {
 104         case HFSPLUS_EXT_CNID:
 105                 fork = &vhdr->ext_file;
 106                 tree = sbi->ext_tree;
 107                 break;
 108         case HFSPLUS_CAT_CNID:
 109                 fork = &vhdr->cat_file;
 110                 tree = sbi->cat_tree;
 111                 break;
 112         case HFSPLUS_ALLOC_CNID:
 113                 fork = &vhdr->alloc_file;
 114                 break;
 115         case HFSPLUS_START_CNID:
 116                 fork = &vhdr->start_file;
 117                 break;
 118         case HFSPLUS_ATTR_CNID:
 119                 fork = &vhdr->attr_file;
 120                 tree = sbi->attr_tree;
 121         default:
 122                 return -EIO;
 123         }
 124
 125         if (fork->total_size != cpu_to_be64(inode->i_size)) {
 126                 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
 127                 hfsplus_mark_mdb_dirty(inode->i_sb);
 128         }
 129         hfsplus_inode_write_fork(inode, fork);
 130         if (tree)
 131                 hfs_btree_write(tree);
 132         return 0;
 133 }
 134
 135 static int hfsplus_write_inode(struct inode *inode,
 136                 struct writeback_control *wbc)
 137 {
 138         int err;
 139
 140         dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
 141
 142         err = hfsplus_ext_write_extent(inode);
 143         if (err)
 144                 return err;
 145
 146         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
 147             inode->i_ino == HFSPLUS_ROOT_CNID)
 148                 return hfsplus_cat_write_inode(inode);
 149         else
 150                 return hfsplus_system_write_inode(inode);
 151 }
 152
 153 static void hfsplus_evict_inode(struct inode *inode)
 154 {
 155         dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
 156         truncate_inode_pages(&inode->i_data, 0);
 157         clear_inode(inode);
 158         if (HFSPLUS_IS_RSRC(inode)) {
 159                 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
 160                 iput(HFSPLUS_I(inode)->rsrc_inode);
 161         }
 162 }
 163
 164 static int hfsplus_sync_fs(struct super_block *sb, int wait)
 165 {
 166         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 167         struct hfsplus_vh *vhdr = sbi->s_vhdr;
 168         int write_backup = 0;
 169         int error, error2;
 170
 171         if (!wait)
 172                 return 0;
 173
 174         dprint(DBG_SUPER, "hfsplus_sync_fs\n");
 175
 176         /*
 177          * Explicitly write out the special metadata inodes.
 178          *
 179          * While these special inodes are marked as hashed and written
 180          * out peridocically by the flusher threads we redirty them
 181          * during writeout of normal inodes, and thus the life lock
 182          * prevents us from getting the latest state to disk.
 183          */
 184         error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
 185         error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
 186         if (!error)
 187                 error = error2;
 188         error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
 189         if (!error)
 190                 error = error2;
 191
 192         mutex_lock(&sbi->vh_mutex);
 193         mutex_lock(&sbi->alloc_mutex);
 194         vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
 195         vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
 196         vhdr->folder_count = cpu_to_be32(sbi->folder_count);
 197         vhdr->file_count = cpu_to_be32(sbi->file_count);
 198
 199         if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
 200                 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
 201                 write_backup = 1;
 202         }
 203
 204         error2 = hfsplus_submit_bio(sb,
 205                                    sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
 206                                    sbi->s_vhdr_buf, NULL, WRITE_SYNC);
 207         if (!error)
 208                 error = error2;
 209         if (!write_backup)
 210                 goto out;
 211
 212         error2 = hfsplus_submit_bio(sb,
 213                                   sbi->part_start + sbi->sect_count - 2,
 214                                   sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC);
 215         if (!error)
 216                 error2 = error;
 217 out:
 218         mutex_unlock(&sbi->alloc_mutex);
 219         mutex_unlock(&sbi->vh_mutex);
 220
 221         if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
 222                 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
 223
 224         return error;
 225 }
 226
 227 static void delayed_sync_fs(struct work_struct *work)
 228 {
 229         struct hfsplus_sb_info *sbi;
 230
 231         sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
 232
 233         spin_lock(&sbi->work_lock);
 234         sbi->work_queued = 0;
 235         spin_unlock(&sbi->work_lock);
 236
 237         hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
 238 }
 239
 240 void hfsplus_mark_mdb_dirty(struct super_block *sb)
 241 {
 242         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 243         unsigned long delay;
 244
 245         if (sb->s_flags & MS_RDONLY)
 246                 return;
 247
 248         spin_lock(&sbi->work_lock);
 249         if (!sbi->work_queued) {
 250                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 251                 queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
 252                 sbi->work_queued = 1;
 253         }
 254         spin_unlock(&sbi->work_lock);
 255 }
 256
 257 static void hfsplus_put_super(struct super_block *sb)
 258 {
 259         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 260
 261         dprint(DBG_SUPER, "hfsplus_put_super\n");
 262
 263         cancel_delayed_work_sync(&sbi->sync_work);
 264
 265         if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
 266                 struct hfsplus_vh *vhdr = sbi->s_vhdr;
 267
 268                 vhdr->modify_date = hfsp_now2mt();
 269                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 270                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 271
 272                 hfsplus_sync_fs(sb, 1);
 273         }
 274
 275         hfs_btree_close(sbi->cat_tree);
 276         hfs_btree_close(sbi->ext_tree);
 277         iput(sbi->alloc_file);
 278         iput(sbi->hidden_dir);
 279         kfree(sbi->s_vhdr_buf);
 280         kfree(sbi->s_backup_vhdr_buf);
 281         unload_nls(sbi->nls);
 282         kfree(sb->s_fs_info);
 283         sb->s_fs_info = NULL;
 284 }
 285
 286 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 287 {
 288         struct super_block *sb = dentry->d_sb;
 289         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 290         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 291
 292         buf->f_type = HFSPLUS_SUPER_MAGIC;
 293         buf->f_bsize = sb->s_blocksize;
 294         buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
 295         buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
 296         buf->f_bavail = buf->f_bfree;
 297         buf->f_files = 0xFFFFFFFF;
 298         buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
 299         buf->f_fsid.val[0] = (u32)id;
 300         buf->f_fsid.val[1] = (u32)(id >> 32);
 301         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 302
 303         return 0;
 304 }
 305
 306 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 307 {
 308         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 309                 return 0;
 310         if (!(*flags & MS_RDONLY)) {
 311                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
 312                 int force = 0;
 313
 314                 if (!hfsplus_parse_options_remount(data, &force))
 315                         return -EINVAL;
 316
 317                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 318                         printk(KERN_WARNING "hfs: filesystem was "
 319                                         "not cleanly unmounted, "
 320                                         "running fsck.hfsplus is recommended.  "
 321                                         "leaving read-only.\n");
 322                         sb->s_flags |= MS_RDONLY;
 323                         *flags |= MS_RDONLY;
 324                 } else if (force) {
 325                         /* nothing */
 326                 } else if (vhdr->attributes &
 327                                 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 328                         printk(KERN_WARNING "hfs: filesystem is marked locked, "
 329                                         "leaving read-only.\n");
 330                         sb->s_flags |= MS_RDONLY;
 331                         *flags |= MS_RDONLY;
 332                 } else if (vhdr->attributes &
 333                                 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 334                         printk(KERN_WARNING "hfs: filesystem is "
 335                                         "marked journaled, "
 336                                         "leaving read-only.\n");
 337                         sb->s_flags |= MS_RDONLY;
 338                         *flags |= MS_RDONLY;
 339                 }
 340         }
 341         return 0;
 342 }
 343
 344 static const struct super_operations hfsplus_sops = {
 345         .alloc_inode    = hfsplus_alloc_inode,
 346         .destroy_inode  = hfsplus_destroy_inode,
 347         .write_inode    = hfsplus_write_inode,
 348         .evict_inode    = hfsplus_evict_inode,
 349         .put_super      = hfsplus_put_super,
 350         .sync_fs        = hfsplus_sync_fs,
 351         .statfs         = hfsplus_statfs,
 352         .remount_fs     = hfsplus_remount,
 353         .show_options   = hfsplus_show_options,
 354 };
 355
 356 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 357 {
 358         struct hfsplus_vh *vhdr;
 359         struct hfsplus_sb_info *sbi;
 360         hfsplus_cat_entry entry;
 361         struct hfs_find_data fd;
 362         struct inode *root, *inode;
 363         struct qstr str;
 364         struct nls_table *nls = NULL;
 365         u64 last_fs_block, last_fs_page;
 366         int err;
 367
 368         err = -ENOMEM;
 369         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 370         if (!sbi)
 371                 goto out;
 372
 373         sb->s_fs_info = sbi;
 374         mutex_init(&sbi->alloc_mutex);
 375         mutex_init(&sbi->vh_mutex);
 376         spin_lock_init(&sbi->work_lock);
 377         INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
 378         hfsplus_fill_defaults(sbi);
 379
 380         err = -EINVAL;
 381         if (!hfsplus_parse_options(data, sbi)) {
 382                 printk(KERN_ERR "hfs: unable to parse mount options\n");
 383                 goto out_unload_nls;
 384         }
 385
 386         /* temporarily use utf8 to correctly find the hidden dir below */
 387         nls = sbi->nls;
 388         sbi->nls = load_nls("utf8");
 389         if (!sbi->nls) {
 390                 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
 391                 goto out_unload_nls;
 392         }
 393
 394         /* Grab the volume header */
 395         if (hfsplus_read_wrapper(sb)) {
 396                 if (!silent)
 397                         printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
 398                 goto out_unload_nls;
 399         }
 400         vhdr = sbi->s_vhdr;
 401
 402         /* Copy parts of the volume header into the superblock */
 403         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 404         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 405             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 406                 printk(KERN_ERR "hfs: wrong filesystem version\n");
 407                 goto out_free_vhdr;
 408         }
 409         sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
 410         sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
 411         sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
 412         sbi->file_count = be32_to_cpu(vhdr->file_count);
 413         sbi->folder_count = be32_to_cpu(vhdr->folder_count);
 414         sbi->data_clump_blocks =
 415                 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
 416         if (!sbi->data_clump_blocks)
 417                 sbi->data_clump_blocks = 1;
 418         sbi->rsrc_clump_blocks =
 419                 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
 420         if (!sbi->rsrc_clump_blocks)
 421                 sbi->rsrc_clump_blocks = 1;
 422
 423         err = -EFBIG;
 424         last_fs_block = sbi->total_blocks - 1;
 425         last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
 426                         PAGE_CACHE_SHIFT;
 427
 428         if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
 429             (last_fs_page > (pgoff_t)(~0ULL))) {
 430                 printk(KERN_ERR "hfs: filesystem size too large.\n");
 431                 goto out_free_vhdr;
 432         }
 433
 434         /* Set up operations so we can load metadata */
 435         sb->s_op = &hfsplus_sops;
 436         sb->s_maxbytes = MAX_LFS_FILESIZE;
 437
 438         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 439                 printk(KERN_WARNING "hfs: Filesystem was "
 440                                 "not cleanly unmounted, "
 441                                 "running fsck.hfsplus is recommended.  "
 442                                 "mounting read-only.\n");
 443                 sb->s_flags |= MS_RDONLY;
 444         } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
 445                 /* nothing */
 446         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 447                 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
 448                 sb->s_flags |= MS_RDONLY;
 449         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
 450                         !(sb->s_flags & MS_RDONLY)) {
 451                 printk(KERN_WARNING "hfs: write access to "
 452                                 "a journaled filesystem is not supported, "
 453                                 "use the force option at your own risk, "
 454                                 "mounting read-only.\n");
 455                 sb->s_flags |= MS_RDONLY;
 456         }
 457
 458         err = -EINVAL;
 459
 460         /* Load metadata objects (B*Trees) */
 461         sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 462         if (!sbi->ext_tree) {
 463                 printk(KERN_ERR "hfs: failed to load extents file\n");
 464                 goto out_free_vhdr;
 465         }
 466         sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 467         if (!sbi->cat_tree) {
 468                 printk(KERN_ERR "hfs: failed to load catalog file\n");
 469                 goto out_close_ext_tree;
 470         }
 471
 472         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 473         if (IS_ERR(inode)) {
 474                 printk(KERN_ERR "hfs: failed to load allocation file\n");
 475                 err = PTR_ERR(inode);
 476                 goto out_close_cat_tree;
 477         }
 478         sbi->alloc_file = inode;
 479
 480         /* Load the root directory */
 481         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 482         if (IS_ERR(root)) {
 483                 printk(KERN_ERR "hfs: failed to load root directory\n");
 484                 err = PTR_ERR(root);
 485                 goto out_put_alloc_file;
 486         }
 487
 488         sb->s_d_op = &hfsplus_dentry_operations;
 489         sb->s_root = d_make_root(root);
 490         if (!sb->s_root) {
 491                 err = -ENOMEM;
 492                 goto out_put_alloc_file;
 493         }
 494
 495         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 496         str.name = HFSP_HIDDENDIR_NAME;
 497         err = hfs_find_init(sbi->cat_tree, &fd);
 498         if (err)
 499                 goto out_put_root;
 500         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 501         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 502                 hfs_find_exit(&fd);
 503                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 504                         goto out_put_root;
 505                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 506                 if (IS_ERR(inode)) {
 507                         err = PTR_ERR(inode);
 508                         goto out_put_root;
 509                 }
 510                 sbi->hidden_dir = inode;
 511         } else
 512                 hfs_find_exit(&fd);
 513
 514         if (!(sb->s_flags & MS_RDONLY)) {
 515                 /*
 516                  * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 517                  * all three are registered with Apple for our use
 518                  */
 519                 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 520                 vhdr->modify_date = hfsp_now2mt();
 521                 be32_add_cpu(&vhdr->write_count, 1);
 522                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 523                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 524                 hfsplus_sync_fs(sb, 1);
 525
 526                 if (!sbi->hidden_dir) {
 527                         mutex_lock(&sbi->vh_mutex);
 528                         sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 529                         if (!sbi->hidden_dir) {
 530                                 mutex_unlock(&sbi->vh_mutex);
 531                                 err = -ENOMEM;
 532                                 goto out_put_root;
 533                         }
 534                         err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
 535                                                  &str, sbi->hidden_dir);
 536                         mutex_unlock(&sbi->vh_mutex);
 537                         if (err)
 538                                 goto out_put_hidden_dir;
 539
 540                         hfsplus_mark_inode_dirty(sbi->hidden_dir,
 541                                                  HFSPLUS_I_CAT_DIRTY);
 542                 }
 543         }
 544
 545         unload_nls(sbi->nls);
 546         sbi->nls = nls;
 547         return 0;
 548
 549 out_put_hidden_dir:
 550         iput(sbi->hidden_dir);
 551 out_put_root:
 552         dput(sb->s_root);
 553         sb->s_root = NULL;
 554 out_put_alloc_file:
 555         iput(sbi->alloc_file);
 556 out_close_cat_tree:
 557         hfs_btree_close(sbi->cat_tree);
 558 out_close_ext_tree:
 559         hfs_btree_close(sbi->ext_tree);
 560 out_free_vhdr:
 561         kfree(sbi->s_vhdr_buf);
 562         kfree(sbi->s_backup_vhdr_buf);
 563 out_unload_nls:
 564         unload_nls(sbi->nls);
 565         unload_nls(nls);
 566         kfree(sbi);
 567 out:
 568         return err;
 569 }
 570
 571 MODULE_AUTHOR("Brad Boyer");
 572 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 573 MODULE_LICENSE("GPL");
 574
 575 static struct kmem_cache *hfsplus_inode_cachep;
 576
 577 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 578 {
 579         struct hfsplus_inode_info *i;
 580
 581         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 582         return i ? &i->vfs_inode : NULL;
 583 }
 584
 585 static void hfsplus_i_callback(struct rcu_head *head)
 586 {
 587         struct inode *inode = container_of(head, struct inode, i_rcu);
 588
 589         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
 590 }
 591
 592 static void hfsplus_destroy_inode(struct inode *inode)
 593 {
 594         call_rcu(&inode->i_rcu, hfsplus_i_callback);
 595 }
 596
 597 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 598
 599 static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
 600                           int flags, const char *dev_name, void *data)
 601 {
 602         return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
 603 }
 604
 605 static struct file_system_type hfsplus_fs_type = {
 606         .owner          = THIS_MODULE,
 607         .name           = "hfsplus",
 608         .mount          = hfsplus_mount,
 609         .kill_sb        = kill_block_super,
 610         .fs_flags       = FS_REQUIRES_DEV,
 611 };
 612
 613 static void hfsplus_init_once(void *p)
 614 {
 615         struct hfsplus_inode_info *i = p;
 616
 617         inode_init_once(&i->vfs_inode);
 618 }
 619
 620 static int __init init_hfsplus_fs(void)
 621 {
 622         int err;
 623
 624         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 625                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 626                 hfsplus_init_once);
 627         if (!hfsplus_inode_cachep)
 628                 return -ENOMEM;
 629         err = register_filesystem(&hfsplus_fs_type);
 630         if (err)
 631                 kmem_cache_destroy(hfsplus_inode_cachep);
 632         return err;
 633 }
 634
 635 static void __exit exit_hfsplus_fs(void)
 636 {
 637         unregister_filesystem(&hfsplus_fs_type);
 638
 639         /*
 640          * Make sure all delayed rcu free inodes are flushed before we
 641          * destroy cache.
 642          */
 643         rcu_barrier();
 644         kmem_cache_destroy(hfsplus_inode_cachep);
 645 }
 646
 647 module_init(init_hfsplus_fs)
 648 module_exit(exit_hfsplus_fs)