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                 int err = hfs_btree_write(tree);
 132                 if (err) {
 133                         printk(KERN_ERR "hfs: b-tree write err: %d, ino %lu\n",
 134                                         err, inode->i_ino);
 135                         return err;
 136                 }
 137         }
 138         return 0;
 139 }
 140
 141 static int hfsplus_write_inode(struct inode *inode,
 142                 struct writeback_control *wbc)
 143 {
 144         int err;
 145
 146         dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
 147
 148         err = hfsplus_ext_write_extent(inode);
 149         if (err)
 150                 return err;
 151
 152         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
 153             inode->i_ino == HFSPLUS_ROOT_CNID)
 154                 return hfsplus_cat_write_inode(inode);
 155         else
 156                 return hfsplus_system_write_inode(inode);
 157 }
 158
 159 static void hfsplus_evict_inode(struct inode *inode)
 160 {
 161         dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
 162         truncate_inode_pages(&inode->i_data, 0);
 163         clear_inode(inode);
 164         if (HFSPLUS_IS_RSRC(inode)) {
 165                 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
 166                 iput(HFSPLUS_I(inode)->rsrc_inode);
 167         }
 168 }
 169
 170 static int hfsplus_sync_fs(struct super_block *sb, int wait)
 171 {
 172         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 173         struct hfsplus_vh *vhdr = sbi->s_vhdr;
 174         int write_backup = 0;
 175         int error, error2;
 176
 177         if (!wait)
 178                 return 0;
 179
 180         dprint(DBG_SUPER, "hfsplus_sync_fs\n");
 181
 182         /*
 183          * Explicitly write out the special metadata inodes.
 184          *
 185          * While these special inodes are marked as hashed and written
 186          * out peridocically by the flusher threads we redirty them
 187          * during writeout of normal inodes, and thus the life lock
 188          * prevents us from getting the latest state to disk.
 189          */
 190         error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
 191         error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
 192         if (!error)
 193                 error = error2;
 194         error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
 195         if (!error)
 196                 error = error2;
 197
 198         mutex_lock(&sbi->vh_mutex);
 199         mutex_lock(&sbi->alloc_mutex);
 200         vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
 201         vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
 202         vhdr->folder_count = cpu_to_be32(sbi->folder_count);
 203         vhdr->file_count = cpu_to_be32(sbi->file_count);
 204
 205         if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
 206                 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
 207                 write_backup = 1;
 208         }
 209
 210         error2 = hfsplus_submit_bio(sb,
 211                                    sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
 212                                    sbi->s_vhdr_buf, NULL, WRITE_SYNC);
 213         if (!error)
 214                 error = error2;
 215         if (!write_backup)
 216                 goto out;
 217
 218         error2 = hfsplus_submit_bio(sb,
 219                                   sbi->part_start + sbi->sect_count - 2,
 220                                   sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC);
 221         if (!error)
 222                 error2 = error;
 223 out:
 224         mutex_unlock(&sbi->alloc_mutex);
 225         mutex_unlock(&sbi->vh_mutex);
 226
 227         if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
 228                 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
 229
 230         return error;
 231 }
 232
 233 static void delayed_sync_fs(struct work_struct *work)
 234 {
 235         struct hfsplus_sb_info *sbi;
 236
 237         sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
 238
 239         spin_lock(&sbi->work_lock);
 240         sbi->work_queued = 0;
 241         spin_unlock(&sbi->work_lock);
 242
 243         hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
 244 }
 245
 246 void hfsplus_mark_mdb_dirty(struct super_block *sb)
 247 {
 248         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 249         unsigned long delay;
 250
 251         if (sb->s_flags & MS_RDONLY)
 252                 return;
 253
 254         spin_lock(&sbi->work_lock);
 255         if (!sbi->work_queued) {
 256                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 257                 queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
 258                 sbi->work_queued = 1;
 259         }
 260         spin_unlock(&sbi->work_lock);
 261 }
 262
 263 static void hfsplus_put_super(struct super_block *sb)
 264 {
 265         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 266
 267         dprint(DBG_SUPER, "hfsplus_put_super\n");
 268
 269         cancel_delayed_work_sync(&sbi->sync_work);
 270
 271         if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
 272                 struct hfsplus_vh *vhdr = sbi->s_vhdr;
 273
 274                 vhdr->modify_date = hfsp_now2mt();
 275                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 276                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 277
 278                 hfsplus_sync_fs(sb, 1);
 279         }
 280
 281         hfs_btree_close(sbi->cat_tree);
 282         hfs_btree_close(sbi->ext_tree);
 283         iput(sbi->alloc_file);
 284         iput(sbi->hidden_dir);
 285         kfree(sbi->s_vhdr_buf);
 286         kfree(sbi->s_backup_vhdr_buf);
 287         unload_nls(sbi->nls);
 288         kfree(sb->s_fs_info);
 289         sb->s_fs_info = NULL;
 290 }
 291
 292 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 293 {
 294         struct super_block *sb = dentry->d_sb;
 295         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 296         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 297
 298         buf->f_type = HFSPLUS_SUPER_MAGIC;
 299         buf->f_bsize = sb->s_blocksize;
 300         buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
 301         buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
 302         buf->f_bavail = buf->f_bfree;
 303         buf->f_files = 0xFFFFFFFF;
 304         buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
 305         buf->f_fsid.val[0] = (u32)id;
 306         buf->f_fsid.val[1] = (u32)(id >> 32);
 307         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 308
 309         return 0;
 310 }
 311
 312 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 313 {
 314         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 315                 return 0;
 316         if (!(*flags & MS_RDONLY)) {
 317                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
 318                 int force = 0;
 319
 320                 if (!hfsplus_parse_options_remount(data, &force))
 321                         return -EINVAL;
 322
 323                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 324                         printk(KERN_WARNING "hfs: filesystem was "
 325                                         "not cleanly unmounted, "
 326                                         "running fsck.hfsplus is recommended.  "
 327                                         "leaving read-only.\n");
 328                         sb->s_flags |= MS_RDONLY;
 329                         *flags |= MS_RDONLY;
 330                 } else if (force) {
 331                         /* nothing */
 332                 } else if (vhdr->attributes &
 333                                 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 334                         printk(KERN_WARNING "hfs: filesystem is marked locked, "
 335                                         "leaving read-only.\n");
 336                         sb->s_flags |= MS_RDONLY;
 337                         *flags |= MS_RDONLY;
 338                 } else if (vhdr->attributes &
 339                                 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 340                         printk(KERN_WARNING "hfs: filesystem is "
 341                                         "marked journaled, "
 342                                         "leaving read-only.\n");
 343                         sb->s_flags |= MS_RDONLY;
 344                         *flags |= MS_RDONLY;
 345                 }
 346         }
 347         return 0;
 348 }
 349
 350 static const struct super_operations hfsplus_sops = {
 351         .alloc_inode    = hfsplus_alloc_inode,
 352         .destroy_inode  = hfsplus_destroy_inode,
 353         .write_inode    = hfsplus_write_inode,
 354         .evict_inode    = hfsplus_evict_inode,
 355         .put_super      = hfsplus_put_super,
 356         .sync_fs        = hfsplus_sync_fs,
 357         .statfs         = hfsplus_statfs,
 358         .remount_fs     = hfsplus_remount,
 359         .show_options   = hfsplus_show_options,
 360 };
 361
 362 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 363 {
 364         struct hfsplus_vh *vhdr;
 365         struct hfsplus_sb_info *sbi;
 366         hfsplus_cat_entry entry;
 367         struct hfs_find_data fd;
 368         struct inode *root, *inode;
 369         struct qstr str;
 370         struct nls_table *nls = NULL;
 371         u64 last_fs_block, last_fs_page;
 372         int err;
 373
 374         err = -ENOMEM;
 375         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 376         if (!sbi)
 377                 goto out;
 378
 379         sb->s_fs_info = sbi;
 380         mutex_init(&sbi->alloc_mutex);
 381         mutex_init(&sbi->vh_mutex);
 382         spin_lock_init(&sbi->work_lock);
 383         INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
 384         hfsplus_fill_defaults(sbi);
 385
 386         err = -EINVAL;
 387         if (!hfsplus_parse_options(data, sbi)) {
 388                 printk(KERN_ERR "hfs: unable to parse mount options\n");
 389                 goto out_unload_nls;
 390         }
 391
 392         /* temporarily use utf8 to correctly find the hidden dir below */
 393         nls = sbi->nls;
 394         sbi->nls = load_nls("utf8");
 395         if (!sbi->nls) {
 396                 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
 397                 goto out_unload_nls;
 398         }
 399
 400         /* Grab the volume header */
 401         if (hfsplus_read_wrapper(sb)) {
 402                 if (!silent)
 403                         printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
 404                 goto out_unload_nls;
 405         }
 406         vhdr = sbi->s_vhdr;
 407
 408         /* Copy parts of the volume header into the superblock */
 409         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 410         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 411             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 412                 printk(KERN_ERR "hfs: wrong filesystem version\n");
 413                 goto out_free_vhdr;
 414         }
 415         sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
 416         sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
 417         sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
 418         sbi->file_count = be32_to_cpu(vhdr->file_count);
 419         sbi->folder_count = be32_to_cpu(vhdr->folder_count);
 420         sbi->data_clump_blocks =
 421                 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
 422         if (!sbi->data_clump_blocks)
 423                 sbi->data_clump_blocks = 1;
 424         sbi->rsrc_clump_blocks =
 425                 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
 426         if (!sbi->rsrc_clump_blocks)
 427                 sbi->rsrc_clump_blocks = 1;
 428
 429         err = -EFBIG;
 430         last_fs_block = sbi->total_blocks - 1;
 431         last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
 432                         PAGE_CACHE_SHIFT;
 433
 434         if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
 435             (last_fs_page > (pgoff_t)(~0ULL))) {
 436                 printk(KERN_ERR "hfs: filesystem size too large.\n");
 437                 goto out_free_vhdr;
 438         }
 439
 440         /* Set up operations so we can load metadata */
 441         sb->s_op = &hfsplus_sops;
 442         sb->s_maxbytes = MAX_LFS_FILESIZE;
 443
 444         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 445                 printk(KERN_WARNING "hfs: Filesystem was "
 446                                 "not cleanly unmounted, "
 447                                 "running fsck.hfsplus is recommended.  "
 448                                 "mounting read-only.\n");
 449                 sb->s_flags |= MS_RDONLY;
 450         } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
 451                 /* nothing */
 452         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 453                 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
 454                 sb->s_flags |= MS_RDONLY;
 455         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
 456                         !(sb->s_flags & MS_RDONLY)) {
 457                 printk(KERN_WARNING "hfs: write access to "
 458                                 "a journaled filesystem is not supported, "
 459                                 "use the force option at your own risk, "
 460                                 "mounting read-only.\n");
 461                 sb->s_flags |= MS_RDONLY;
 462         }
 463
 464         err = -EINVAL;
 465
 466         /* Load metadata objects (B*Trees) */
 467         sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 468         if (!sbi->ext_tree) {
 469                 printk(KERN_ERR "hfs: failed to load extents file\n");
 470                 goto out_free_vhdr;
 471         }
 472         sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 473         if (!sbi->cat_tree) {
 474                 printk(KERN_ERR "hfs: failed to load catalog file\n");
 475                 goto out_close_ext_tree;
 476         }
 477
 478         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 479         if (IS_ERR(inode)) {
 480                 printk(KERN_ERR "hfs: failed to load allocation file\n");
 481                 err = PTR_ERR(inode);
 482                 goto out_close_cat_tree;
 483         }
 484         sbi->alloc_file = inode;
 485
 486         /* Load the root directory */
 487         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 488         if (IS_ERR(root)) {
 489                 printk(KERN_ERR "hfs: failed to load root directory\n");
 490                 err = PTR_ERR(root);
 491                 goto out_put_alloc_file;
 492         }
 493
 494         sb->s_d_op = &hfsplus_dentry_operations;
 495         sb->s_root = d_make_root(root);
 496         if (!sb->s_root) {
 497                 err = -ENOMEM;
 498                 goto out_put_alloc_file;
 499         }
 500
 501         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 502         str.name = HFSP_HIDDENDIR_NAME;
 503         err = hfs_find_init(sbi->cat_tree, &fd);
 504         if (err)
 505                 goto out_put_root;
 506         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 507         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 508                 hfs_find_exit(&fd);
 509                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 510                         goto out_put_root;
 511                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 512                 if (IS_ERR(inode)) {
 513                         err = PTR_ERR(inode);
 514                         goto out_put_root;
 515                 }
 516                 sbi->hidden_dir = inode;
 517         } else
 518                 hfs_find_exit(&fd);
 519
 520         if (!(sb->s_flags & MS_RDONLY)) {
 521                 /*
 522                  * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 523                  * all three are registered with Apple for our use
 524                  */
 525                 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 526                 vhdr->modify_date = hfsp_now2mt();
 527                 be32_add_cpu(&vhdr->write_count, 1);
 528                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 529                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 530                 hfsplus_sync_fs(sb, 1);
 531
 532                 if (!sbi->hidden_dir) {
 533                         mutex_lock(&sbi->vh_mutex);
 534                         sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 535                         if (!sbi->hidden_dir) {
 536                                 mutex_unlock(&sbi->vh_mutex);
 537                                 err = -ENOMEM;
 538                                 goto out_put_root;
 539                         }
 540                         err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
 541                                                  &str, sbi->hidden_dir);
 542                         mutex_unlock(&sbi->vh_mutex);
 543                         if (err)
 544                                 goto out_put_hidden_dir;
 545
 546                         hfsplus_mark_inode_dirty(sbi->hidden_dir,
 547                                                  HFSPLUS_I_CAT_DIRTY);
 548                 }
 549         }
 550
 551         unload_nls(sbi->nls);
 552         sbi->nls = nls;
 553         return 0;
 554
 555 out_put_hidden_dir:
 556         iput(sbi->hidden_dir);
 557 out_put_root:
 558         dput(sb->s_root);
 559         sb->s_root = NULL;
 560 out_put_alloc_file:
 561         iput(sbi->alloc_file);
 562 out_close_cat_tree:
 563         hfs_btree_close(sbi->cat_tree);
 564 out_close_ext_tree:
 565         hfs_btree_close(sbi->ext_tree);
 566 out_free_vhdr:
 567         kfree(sbi->s_vhdr_buf);
 568         kfree(sbi->s_backup_vhdr_buf);
 569 out_unload_nls:
 570         unload_nls(sbi->nls);
 571         unload_nls(nls);
 572         kfree(sbi);
 573 out:
 574         return err;
 575 }
 576
 577 MODULE_AUTHOR("Brad Boyer");
 578 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 579 MODULE_LICENSE("GPL");
 580
 581 static struct kmem_cache *hfsplus_inode_cachep;
 582
 583 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 584 {
 585         struct hfsplus_inode_info *i;
 586
 587         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 588         return i ? &i->vfs_inode : NULL;
 589 }
 590
 591 static void hfsplus_i_callback(struct rcu_head *head)
 592 {
 593         struct inode *inode = container_of(head, struct inode, i_rcu);
 594
 595         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
 596 }
 597
 598 static void hfsplus_destroy_inode(struct inode *inode)
 599 {
 600         call_rcu(&inode->i_rcu, hfsplus_i_callback);
 601 }
 602
 603 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 604
 605 static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
 606                           int flags, const char *dev_name, void *data)
 607 {
 608         return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
 609 }
 610
 611 static struct file_system_type hfsplus_fs_type = {
 612         .owner          = THIS_MODULE,
 613         .name           = "hfsplus",
 614         .mount          = hfsplus_mount,
 615         .kill_sb        = kill_block_super,
 616         .fs_flags       = FS_REQUIRES_DEV,
 617 };
 618
 619 static void hfsplus_init_once(void *p)
 620 {
 621         struct hfsplus_inode_info *i = p;
 622
 623         inode_init_once(&i->vfs_inode);
 624 }
 625
 626 static int __init init_hfsplus_fs(void)
 627 {
 628         int err;
 629
 630         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 631                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 632                 hfsplus_init_once);
 633         if (!hfsplus_inode_cachep)
 634                 return -ENOMEM;
 635         err = register_filesystem(&hfsplus_fs_type);
 636         if (err)
 637                 kmem_cache_destroy(hfsplus_inode_cachep);
 638         return err;
 639 }
 640
 641 static void __exit exit_hfsplus_fs(void)
 642 {
 643         unregister_filesystem(&hfsplus_fs_type);
 644
 645         /*
 646          * Make sure all delayed rcu free inodes are flushed before we
 647          * destroy cache.
 648          */
 649         rcu_barrier();
 650         kmem_cache_destroy(hfsplus_inode_cachep);
 651 }
 652
 653 module_init(init_hfsplus_fs)
 654 module_exit(exit_hfsplus_fs)