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         int err;
 236         struct hfsplus_sb_info *sbi;
 237
 238         sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
 239
 240         spin_lock(&sbi->work_lock);
 241         sbi->work_queued = 0;
 242         spin_unlock(&sbi->work_lock);
 243
 244         err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
 245         if (err)
 246                 printk(KERN_ERR "hfs: delayed sync fs err %d\n", err);
 247 }
 248
 249 void hfsplus_mark_mdb_dirty(struct super_block *sb)
 250 {
 251         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 252         unsigned long delay;
 253
 254         if (sb->s_flags & MS_RDONLY)
 255                 return;
 256
 257         spin_lock(&sbi->work_lock);
 258         if (!sbi->work_queued) {
 259                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 260                 queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
 261                 sbi->work_queued = 1;
 262         }
 263         spin_unlock(&sbi->work_lock);
 264 }
 265
 266 static void hfsplus_put_super(struct super_block *sb)
 267 {
 268         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 269
 270         dprint(DBG_SUPER, "hfsplus_put_super\n");
 271
 272         cancel_delayed_work_sync(&sbi->sync_work);
 273
 274         if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
 275                 struct hfsplus_vh *vhdr = sbi->s_vhdr;
 276
 277                 vhdr->modify_date = hfsp_now2mt();
 278                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 279                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 280
 281                 hfsplus_sync_fs(sb, 1);
 282         }
 283
 284         hfs_btree_close(sbi->cat_tree);
 285         hfs_btree_close(sbi->ext_tree);
 286         iput(sbi->alloc_file);
 287         iput(sbi->hidden_dir);
 288         kfree(sbi->s_vhdr_buf);
 289         kfree(sbi->s_backup_vhdr_buf);
 290         unload_nls(sbi->nls);
 291         kfree(sb->s_fs_info);
 292         sb->s_fs_info = NULL;
 293 }
 294
 295 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 296 {
 297         struct super_block *sb = dentry->d_sb;
 298         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 299         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 300
 301         buf->f_type = HFSPLUS_SUPER_MAGIC;
 302         buf->f_bsize = sb->s_blocksize;
 303         buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
 304         buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
 305         buf->f_bavail = buf->f_bfree;
 306         buf->f_files = 0xFFFFFFFF;
 307         buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
 308         buf->f_fsid.val[0] = (u32)id;
 309         buf->f_fsid.val[1] = (u32)(id >> 32);
 310         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 311
 312         return 0;
 313 }
 314
 315 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 316 {
 317         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 318                 return 0;
 319         if (!(*flags & MS_RDONLY)) {
 320                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
 321                 int force = 0;
 322
 323                 if (!hfsplus_parse_options_remount(data, &force))
 324                         return -EINVAL;
 325
 326                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 327                         printk(KERN_WARNING "hfs: filesystem was "
 328                                         "not cleanly unmounted, "
 329                                         "running fsck.hfsplus is recommended.  "
 330                                         "leaving read-only.\n");
 331                         sb->s_flags |= MS_RDONLY;
 332                         *flags |= MS_RDONLY;
 333                 } else if (force) {
 334                         /* nothing */
 335                 } else if (vhdr->attributes &
 336                                 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 337                         printk(KERN_WARNING "hfs: filesystem is marked locked, "
 338                                         "leaving read-only.\n");
 339                         sb->s_flags |= MS_RDONLY;
 340                         *flags |= MS_RDONLY;
 341                 } else if (vhdr->attributes &
 342                                 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 343                         printk(KERN_WARNING "hfs: filesystem is "
 344                                         "marked journaled, "
 345                                         "leaving read-only.\n");
 346                         sb->s_flags |= MS_RDONLY;
 347                         *flags |= MS_RDONLY;
 348                 }
 349         }
 350         return 0;
 351 }
 352
 353 static const struct super_operations hfsplus_sops = {
 354         .alloc_inode    = hfsplus_alloc_inode,
 355         .destroy_inode  = hfsplus_destroy_inode,
 356         .write_inode    = hfsplus_write_inode,
 357         .evict_inode    = hfsplus_evict_inode,
 358         .put_super      = hfsplus_put_super,
 359         .sync_fs        = hfsplus_sync_fs,
 360         .statfs         = hfsplus_statfs,
 361         .remount_fs     = hfsplus_remount,
 362         .show_options   = hfsplus_show_options,
 363 };
 364
 365 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 366 {
 367         struct hfsplus_vh *vhdr;
 368         struct hfsplus_sb_info *sbi;
 369         hfsplus_cat_entry entry;
 370         struct hfs_find_data fd;
 371         struct inode *root, *inode;
 372         struct qstr str;
 373         struct nls_table *nls = NULL;
 374         u64 last_fs_block, last_fs_page;
 375         int err;
 376
 377         err = -ENOMEM;
 378         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 379         if (!sbi)
 380                 goto out;
 381
 382         sb->s_fs_info = sbi;
 383         mutex_init(&sbi->alloc_mutex);
 384         mutex_init(&sbi->vh_mutex);
 385         spin_lock_init(&sbi->work_lock);
 386         INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
 387         hfsplus_fill_defaults(sbi);
 388
 389         err = -EINVAL;
 390         if (!hfsplus_parse_options(data, sbi)) {
 391                 printk(KERN_ERR "hfs: unable to parse mount options\n");
 392                 goto out_unload_nls;
 393         }
 394
 395         /* temporarily use utf8 to correctly find the hidden dir below */
 396         nls = sbi->nls;
 397         sbi->nls = load_nls("utf8");
 398         if (!sbi->nls) {
 399                 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
 400                 goto out_unload_nls;
 401         }
 402
 403         /* Grab the volume header */
 404         if (hfsplus_read_wrapper(sb)) {
 405                 if (!silent)
 406                         printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
 407                 goto out_unload_nls;
 408         }
 409         vhdr = sbi->s_vhdr;
 410
 411         /* Copy parts of the volume header into the superblock */
 412         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 413         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 414             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 415                 printk(KERN_ERR "hfs: wrong filesystem version\n");
 416                 goto out_free_vhdr;
 417         }
 418         sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
 419         sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
 420         sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
 421         sbi->file_count = be32_to_cpu(vhdr->file_count);
 422         sbi->folder_count = be32_to_cpu(vhdr->folder_count);
 423         sbi->data_clump_blocks =
 424                 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
 425         if (!sbi->data_clump_blocks)
 426                 sbi->data_clump_blocks = 1;
 427         sbi->rsrc_clump_blocks =
 428                 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
 429         if (!sbi->rsrc_clump_blocks)
 430                 sbi->rsrc_clump_blocks = 1;
 431
 432         err = -EFBIG;
 433         last_fs_block = sbi->total_blocks - 1;
 434         last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
 435                         PAGE_CACHE_SHIFT;
 436
 437         if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
 438             (last_fs_page > (pgoff_t)(~0ULL))) {
 439                 printk(KERN_ERR "hfs: filesystem size too large.\n");
 440                 goto out_free_vhdr;
 441         }
 442
 443         /* Set up operations so we can load metadata */
 444         sb->s_op = &hfsplus_sops;
 445         sb->s_maxbytes = MAX_LFS_FILESIZE;
 446
 447         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 448                 printk(KERN_WARNING "hfs: Filesystem was "
 449                                 "not cleanly unmounted, "
 450                                 "running fsck.hfsplus is recommended.  "
 451                                 "mounting read-only.\n");
 452                 sb->s_flags |= MS_RDONLY;
 453         } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
 454                 /* nothing */
 455         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 456                 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
 457                 sb->s_flags |= MS_RDONLY;
 458         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
 459                         !(sb->s_flags & MS_RDONLY)) {
 460                 printk(KERN_WARNING "hfs: write access to "
 461                                 "a journaled filesystem is not supported, "
 462                                 "use the force option at your own risk, "
 463                                 "mounting read-only.\n");
 464                 sb->s_flags |= MS_RDONLY;
 465         }
 466
 467         err = -EINVAL;
 468
 469         /* Load metadata objects (B*Trees) */
 470         sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 471         if (!sbi->ext_tree) {
 472                 printk(KERN_ERR "hfs: failed to load extents file\n");
 473                 goto out_free_vhdr;
 474         }
 475         sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 476         if (!sbi->cat_tree) {
 477                 printk(KERN_ERR "hfs: failed to load catalog file\n");
 478                 goto out_close_ext_tree;
 479         }
 480
 481         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 482         if (IS_ERR(inode)) {
 483                 printk(KERN_ERR "hfs: failed to load allocation file\n");
 484                 err = PTR_ERR(inode);
 485                 goto out_close_cat_tree;
 486         }
 487         sbi->alloc_file = inode;
 488
 489         /* Load the root directory */
 490         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 491         if (IS_ERR(root)) {
 492                 printk(KERN_ERR "hfs: failed to load root directory\n");
 493                 err = PTR_ERR(root);
 494                 goto out_put_alloc_file;
 495         }
 496
 497         sb->s_d_op = &hfsplus_dentry_operations;
 498         sb->s_root = d_make_root(root);
 499         if (!sb->s_root) {
 500                 err = -ENOMEM;
 501                 goto out_put_alloc_file;
 502         }
 503
 504         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 505         str.name = HFSP_HIDDENDIR_NAME;
 506         err = hfs_find_init(sbi->cat_tree, &fd);
 507         if (err)
 508                 goto out_put_root;
 509         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 510         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 511                 hfs_find_exit(&fd);
 512                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 513                         goto out_put_root;
 514                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 515                 if (IS_ERR(inode)) {
 516                         err = PTR_ERR(inode);
 517                         goto out_put_root;
 518                 }
 519                 sbi->hidden_dir = inode;
 520         } else
 521                 hfs_find_exit(&fd);
 522
 523         if (!(sb->s_flags & MS_RDONLY)) {
 524                 /*
 525                  * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 526                  * all three are registered with Apple for our use
 527                  */
 528                 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 529                 vhdr->modify_date = hfsp_now2mt();
 530                 be32_add_cpu(&vhdr->write_count, 1);
 531                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 532                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 533                 hfsplus_sync_fs(sb, 1);
 534
 535                 if (!sbi->hidden_dir) {
 536                         mutex_lock(&sbi->vh_mutex);
 537                         sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 538                         if (!sbi->hidden_dir) {
 539                                 mutex_unlock(&sbi->vh_mutex);
 540                                 err = -ENOMEM;
 541                                 goto out_put_root;
 542                         }
 543                         err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
 544                                                  &str, sbi->hidden_dir);
 545                         mutex_unlock(&sbi->vh_mutex);
 546                         if (err)
 547                                 goto out_put_hidden_dir;
 548
 549                         hfsplus_mark_inode_dirty(sbi->hidden_dir,
 550                                                  HFSPLUS_I_CAT_DIRTY);
 551                 }
 552         }
 553
 554         unload_nls(sbi->nls);
 555         sbi->nls = nls;
 556         return 0;
 557
 558 out_put_hidden_dir:
 559         iput(sbi->hidden_dir);
 560 out_put_root:
 561         dput(sb->s_root);
 562         sb->s_root = NULL;
 563 out_put_alloc_file:
 564         iput(sbi->alloc_file);
 565 out_close_cat_tree:
 566         hfs_btree_close(sbi->cat_tree);
 567 out_close_ext_tree:
 568         hfs_btree_close(sbi->ext_tree);
 569 out_free_vhdr:
 570         kfree(sbi->s_vhdr_buf);
 571         kfree(sbi->s_backup_vhdr_buf);
 572 out_unload_nls:
 573         unload_nls(sbi->nls);
 574         unload_nls(nls);
 575         kfree(sbi);
 576 out:
 577         return err;
 578 }
 579
 580 MODULE_AUTHOR("Brad Boyer");
 581 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 582 MODULE_LICENSE("GPL");
 583
 584 static struct kmem_cache *hfsplus_inode_cachep;
 585
 586 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 587 {
 588         struct hfsplus_inode_info *i;
 589
 590         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 591         return i ? &i->vfs_inode : NULL;
 592 }
 593
 594 static void hfsplus_i_callback(struct rcu_head *head)
 595 {
 596         struct inode *inode = container_of(head, struct inode, i_rcu);
 597
 598         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
 599 }
 600
 601 static void hfsplus_destroy_inode(struct inode *inode)
 602 {
 603         call_rcu(&inode->i_rcu, hfsplus_i_callback);
 604 }
 605
 606 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 607
 608 static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
 609                           int flags, const char *dev_name, void *data)
 610 {
 611         return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
 612 }
 613
 614 static struct file_system_type hfsplus_fs_type = {
 615         .owner          = THIS_MODULE,
 616         .name           = "hfsplus",
 617         .mount          = hfsplus_mount,
 618         .kill_sb        = kill_block_super,
 619         .fs_flags       = FS_REQUIRES_DEV,
 620 };
 621
 622 static void hfsplus_init_once(void *p)
 623 {
 624         struct hfsplus_inode_info *i = p;
 625
 626         inode_init_once(&i->vfs_inode);
 627 }
 628
 629 static int __init init_hfsplus_fs(void)
 630 {
 631         int err;
 632
 633         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 634                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 635                 hfsplus_init_once);
 636         if (!hfsplus_inode_cachep)
 637                 return -ENOMEM;
 638         err = register_filesystem(&hfsplus_fs_type);
 639         if (err)
 640                 kmem_cache_destroy(hfsplus_inode_cachep);
 641         return err;
 642 }
 643
 644 static void __exit exit_hfsplus_fs(void)
 645 {
 646         unregister_filesystem(&hfsplus_fs_type);
 647
 648         /*
 649          * Make sure all delayed rcu free inodes are flushed before we
 650          * destroy cache.
 651          */
 652         rcu_barrier();
 653         kmem_cache_destroy(hfsplus_inode_cachep);
 654 }
 655
 656 module_init(init_hfsplus_fs)
 657 module_exit(exit_hfsplus_fs)