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/backing-dev.h>
  15 #include <linux/fs.h>
  16 #include <linux/slab.h>
  17 #include <linux/vfs.h>
  18 #include <linux/nls.h>
  19
  20 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
  21 static void hfsplus_destroy_inode(struct inode *inode);
  22
  23 #include "hfsplus_fs.h"
  24 #include "xattr.h"
  25
  26 static int hfsplus_system_read_inode(struct inode *inode)
  27 {
  28         struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
  29
  30         switch (inode->i_ino) {
  31         case HFSPLUS_EXT_CNID:
  32                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
  33                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  34                 break;
  35         case HFSPLUS_CAT_CNID:
  36                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
  37                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  38                 break;
  39         case HFSPLUS_ALLOC_CNID:
  40                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
  41                 inode->i_mapping->a_ops = &hfsplus_aops;
  42                 break;
  43         case HFSPLUS_START_CNID:
  44                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
  45                 break;
  46         case HFSPLUS_ATTR_CNID:
  47                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
  48                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  49                 break;
  50         default:
  51                 return -EIO;
  52         }
  53
  54         return 0;
  55 }
  56
  57 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
  58 {
  59         struct hfs_find_data fd;
  60         struct inode *inode;
  61         int err;
  62
  63         inode = iget_locked(sb, ino);
  64         if (!inode)
  65                 return ERR_PTR(-ENOMEM);
  66         if (!(inode->i_state & I_NEW))
  67                 return inode;
  68
  69         INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
  70         spin_lock_init(&HFSPLUS_I(inode)->open_dir_lock);
  71         mutex_init(&HFSPLUS_I(inode)->extents_lock);
  72         HFSPLUS_I(inode)->flags = 0;
  73         HFSPLUS_I(inode)->extent_state = 0;
  74         HFSPLUS_I(inode)->rsrc_inode = NULL;
  75         atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
  76
  77         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
  78             inode->i_ino == HFSPLUS_ROOT_CNID) {
  79                 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
  80                 if (!err) {
  81                         err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
  82                         if (!err)
  83                                 err = hfsplus_cat_read_inode(inode, &fd);
  84                         hfs_find_exit(&fd);
  85                 }
  86         } else {
  87                 err = hfsplus_system_read_inode(inode);
  88         }
  89
  90         if (err) {
  91                 iget_failed(inode);
  92                 return ERR_PTR(err);
  93         }
  94
  95         unlock_new_inode(inode);
  96         return inode;
  97 }
  98
  99 static int hfsplus_system_write_inode(struct inode *inode)
 100 {
 101         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
 102         struct hfsplus_vh *vhdr = sbi->s_vhdr;
 103         struct hfsplus_fork_raw *fork;
 104         struct hfs_btree *tree = NULL;
 105
 106         switch (inode->i_ino) {
 107         case HFSPLUS_EXT_CNID:
 108                 fork = &vhdr->ext_file;
 109                 tree = sbi->ext_tree;
 110                 break;
 111         case HFSPLUS_CAT_CNID:
 112                 fork = &vhdr->cat_file;
 113                 tree = sbi->cat_tree;
 114                 break;
 115         case HFSPLUS_ALLOC_CNID:
 116                 fork = &vhdr->alloc_file;
 117                 break;
 118         case HFSPLUS_START_CNID:
 119                 fork = &vhdr->start_file;
 120                 break;
 121         case HFSPLUS_ATTR_CNID:
 122                 fork = &vhdr->attr_file;
 123                 tree = sbi->attr_tree;
 124                 break;
 125         default:
 126                 return -EIO;
 127         }
 128
 129         if (fork->total_size != cpu_to_be64(inode->i_size)) {
 130                 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
 131                 hfsplus_mark_mdb_dirty(inode->i_sb);
 132         }
 133         hfsplus_inode_write_fork(inode, fork);
 134         if (tree) {
 135                 int err = hfs_btree_write(tree);
 136
 137                 if (err) {
 138                         pr_err("b-tree write err: %d, ino %lu\n",
 139                                err, inode->i_ino);
 140                         return err;
 141                 }
 142         }
 143         return 0;
 144 }
 145
 146 static int hfsplus_write_inode(struct inode *inode,
 147                 struct writeback_control *wbc)
 148 {
 149         int err;
 150
 151         hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
 152
 153         err = hfsplus_ext_write_extent(inode);
 154         if (err)
 155                 return err;
 156
 157         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
 158             inode->i_ino == HFSPLUS_ROOT_CNID)
 159                 return hfsplus_cat_write_inode(inode);
 160         else
 161                 return hfsplus_system_write_inode(inode);
 162 }
 163
 164 static void hfsplus_evict_inode(struct inode *inode)
 165 {
 166         hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
 167         truncate_inode_pages_final(&inode->i_data);
 168         clear_inode(inode);
 169         if (HFSPLUS_IS_RSRC(inode)) {
 170                 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
 171                 iput(HFSPLUS_I(inode)->rsrc_inode);
 172         }
 173 }
 174
 175 static int hfsplus_sync_fs(struct super_block *sb, int wait)
 176 {
 177         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 178         struct hfsplus_vh *vhdr = sbi->s_vhdr;
 179         int write_backup = 0;
 180         int error, error2;
 181
 182         if (!wait)
 183                 return 0;
 184
 185         hfs_dbg(SUPER, "hfsplus_sync_fs\n");
 186
 187         /*
 188          * Explicitly write out the special metadata inodes.
 189          *
 190          * While these special inodes are marked as hashed and written
 191          * out peridocically by the flusher threads we redirty them
 192          * during writeout of normal inodes, and thus the life lock
 193          * prevents us from getting the latest state to disk.
 194          */
 195         error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
 196         error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
 197         if (!error)
 198                 error = error2;
 199         if (sbi->attr_tree) {
 200                 error2 =
 201                     filemap_write_and_wait(sbi->attr_tree->inode->i_mapping);
 202                 if (!error)
 203                         error = error2;
 204         }
 205         error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
 206         if (!error)
 207                 error = error2;
 208
 209         mutex_lock(&sbi->vh_mutex);
 210         mutex_lock(&sbi->alloc_mutex);
 211         vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
 212         vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
 213         vhdr->folder_count = cpu_to_be32(sbi->folder_count);
 214         vhdr->file_count = cpu_to_be32(sbi->file_count);
 215
 216         if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
 217                 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
 218                 write_backup = 1;
 219         }
 220
 221         error2 = hfsplus_submit_bio(sb,
 222                                    sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
 223                                    sbi->s_vhdr_buf, NULL, REQ_OP_WRITE,
 224                                    WRITE_SYNC);
 225         if (!error)
 226                 error = error2;
 227         if (!write_backup)
 228                 goto out;
 229
 230         error2 = hfsplus_submit_bio(sb,
 231                                   sbi->part_start + sbi->sect_count - 2,
 232                                   sbi->s_backup_vhdr_buf, NULL, REQ_OP_WRITE,
 233                                   WRITE_SYNC);
 234         if (!error)
 235                 error2 = error;
 236 out:
 237         mutex_unlock(&sbi->alloc_mutex);
 238         mutex_unlock(&sbi->vh_mutex);
 239
 240         if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
 241                 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
 242
 243         return error;
 244 }
 245
 246 static void delayed_sync_fs(struct work_struct *work)
 247 {
 248         int err;
 249         struct hfsplus_sb_info *sbi;
 250
 251         sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
 252
 253         spin_lock(&sbi->work_lock);
 254         sbi->work_queued = 0;
 255         spin_unlock(&sbi->work_lock);
 256
 257         err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
 258         if (err)
 259                 pr_err("delayed sync fs err %d\n", err);
 260 }
 261
 262 void hfsplus_mark_mdb_dirty(struct super_block *sb)
 263 {
 264         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 265         unsigned long delay;
 266
 267         if (sb->s_flags & MS_RDONLY)
 268                 return;
 269
 270         spin_lock(&sbi->work_lock);
 271         if (!sbi->work_queued) {
 272                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 273                 queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
 274                 sbi->work_queued = 1;
 275         }
 276         spin_unlock(&sbi->work_lock);
 277 }
 278
 279 static void hfsplus_put_super(struct super_block *sb)
 280 {
 281         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 282
 283         hfs_dbg(SUPER, "hfsplus_put_super\n");
 284
 285         cancel_delayed_work_sync(&sbi->sync_work);
 286
 287         if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
 288                 struct hfsplus_vh *vhdr = sbi->s_vhdr;
 289
 290                 vhdr->modify_date = hfsp_now2mt();
 291                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 292                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 293
 294                 hfsplus_sync_fs(sb, 1);
 295         }
 296
 297         hfs_btree_close(sbi->attr_tree);
 298         hfs_btree_close(sbi->cat_tree);
 299         hfs_btree_close(sbi->ext_tree);
 300         iput(sbi->alloc_file);
 301         iput(sbi->hidden_dir);
 302         kfree(sbi->s_vhdr_buf);
 303         kfree(sbi->s_backup_vhdr_buf);
 304         unload_nls(sbi->nls);
 305         kfree(sb->s_fs_info);
 306         sb->s_fs_info = NULL;
 307 }
 308
 309 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 310 {
 311         struct super_block *sb = dentry->d_sb;
 312         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 313         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 314
 315         buf->f_type = HFSPLUS_SUPER_MAGIC;
 316         buf->f_bsize = sb->s_blocksize;
 317         buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
 318         buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
 319         buf->f_bavail = buf->f_bfree;
 320         buf->f_files = 0xFFFFFFFF;
 321         buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
 322         buf->f_fsid.val[0] = (u32)id;
 323         buf->f_fsid.val[1] = (u32)(id >> 32);
 324         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 325
 326         return 0;
 327 }
 328
 329 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 330 {
 331         sync_filesystem(sb);
 332         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 333                 return 0;
 334         if (!(*flags & MS_RDONLY)) {
 335                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
 336                 int force = 0;
 337
 338                 if (!hfsplus_parse_options_remount(data, &force))
 339                         return -EINVAL;
 340
 341                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 342                         pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  leaving read-only.\n");
 343                         sb->s_flags |= MS_RDONLY;
 344                         *flags |= MS_RDONLY;
 345                 } else if (force) {
 346                         /* nothing */
 347                 } else if (vhdr->attributes &
 348                                 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 349                         pr_warn("filesystem is marked locked, leaving read-only.\n");
 350                         sb->s_flags |= MS_RDONLY;
 351                         *flags |= MS_RDONLY;
 352                 } else if (vhdr->attributes &
 353                                 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 354                         pr_warn("filesystem is marked journaled, leaving read-only.\n");
 355                         sb->s_flags |= MS_RDONLY;
 356                         *flags |= MS_RDONLY;
 357                 }
 358         }
 359         return 0;
 360 }
 361
 362 static const struct super_operations hfsplus_sops = {
 363         .alloc_inode    = hfsplus_alloc_inode,
 364         .destroy_inode  = hfsplus_destroy_inode,
 365         .write_inode    = hfsplus_write_inode,
 366         .evict_inode    = hfsplus_evict_inode,
 367         .put_super      = hfsplus_put_super,
 368         .sync_fs        = hfsplus_sync_fs,
 369         .statfs         = hfsplus_statfs,
 370         .remount_fs     = hfsplus_remount,
 371         .show_options   = hfsplus_show_options,
 372 };
 373
 374 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 375 {
 376         struct hfsplus_vh *vhdr;
 377         struct hfsplus_sb_info *sbi;
 378         hfsplus_cat_entry entry;
 379         struct hfs_find_data fd;
 380         struct inode *root, *inode;
 381         struct qstr str;
 382         struct nls_table *nls = NULL;
 383         u64 last_fs_block, last_fs_page;
 384         int err;
 385
 386         err = -ENOMEM;
 387         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 388         if (!sbi)
 389                 goto out;
 390
 391         sb->s_fs_info = sbi;
 392         mutex_init(&sbi->alloc_mutex);
 393         mutex_init(&sbi->vh_mutex);
 394         spin_lock_init(&sbi->work_lock);
 395         INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
 396         hfsplus_fill_defaults(sbi);
 397
 398         err = -EINVAL;
 399         if (!hfsplus_parse_options(data, sbi)) {
 400                 pr_err("unable to parse mount options\n");
 401                 goto out_unload_nls;
 402         }
 403
 404         /* temporarily use utf8 to correctly find the hidden dir below */
 405         nls = sbi->nls;
 406         sbi->nls = load_nls("utf8");
 407         if (!sbi->nls) {
 408                 pr_err("unable to load nls for utf8\n");
 409                 goto out_unload_nls;
 410         }
 411
 412         /* Grab the volume header */
 413         if (hfsplus_read_wrapper(sb)) {
 414                 if (!silent)
 415                         pr_warn("unable to find HFS+ superblock\n");
 416                 goto out_unload_nls;
 417         }
 418         vhdr = sbi->s_vhdr;
 419
 420         /* Copy parts of the volume header into the superblock */
 421         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 422         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 423             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 424                 pr_err("wrong filesystem version\n");
 425                 goto out_free_vhdr;
 426         }
 427         sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
 428         sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
 429         sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
 430         sbi->file_count = be32_to_cpu(vhdr->file_count);
 431         sbi->folder_count = be32_to_cpu(vhdr->folder_count);
 432         sbi->data_clump_blocks =
 433                 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
 434         if (!sbi->data_clump_blocks)
 435                 sbi->data_clump_blocks = 1;
 436         sbi->rsrc_clump_blocks =
 437                 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
 438         if (!sbi->rsrc_clump_blocks)
 439                 sbi->rsrc_clump_blocks = 1;
 440
 441         err = -EFBIG;
 442         last_fs_block = sbi->total_blocks - 1;
 443         last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
 444                         PAGE_SHIFT;
 445
 446         if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
 447             (last_fs_page > (pgoff_t)(~0ULL))) {
 448                 pr_err("filesystem size too large\n");
 449                 goto out_free_vhdr;
 450         }
 451
 452         /* Set up operations so we can load metadata */
 453         sb->s_op = &hfsplus_sops;
 454         sb->s_maxbytes = MAX_LFS_FILESIZE;
 455
 456         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 457                 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  mounting read-only.\n");
 458                 sb->s_flags |= MS_RDONLY;
 459         } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
 460                 /* nothing */
 461         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 462                 pr_warn("Filesystem is marked locked, mounting read-only.\n");
 463                 sb->s_flags |= MS_RDONLY;
 464         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
 465                         !(sb->s_flags & MS_RDONLY)) {
 466                 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
 467                 sb->s_flags |= MS_RDONLY;
 468         }
 469
 470         err = -EINVAL;
 471
 472         /* Load metadata objects (B*Trees) */
 473         sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 474         if (!sbi->ext_tree) {
 475                 pr_err("failed to load extents file\n");
 476                 goto out_free_vhdr;
 477         }
 478         sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 479         if (!sbi->cat_tree) {
 480                 pr_err("failed to load catalog file\n");
 481                 goto out_close_ext_tree;
 482         }
 483         atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
 484         if (vhdr->attr_file.total_blocks != 0) {
 485                 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
 486                 if (!sbi->attr_tree) {
 487                         pr_err("failed to load attributes file\n");
 488                         goto out_close_cat_tree;
 489                 }
 490                 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
 491         }
 492         sb->s_xattr = hfsplus_xattr_handlers;
 493
 494         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 495         if (IS_ERR(inode)) {
 496                 pr_err("failed to load allocation file\n");
 497                 err = PTR_ERR(inode);
 498                 goto out_close_attr_tree;
 499         }
 500         sbi->alloc_file = inode;
 501
 502         /* Load the root directory */
 503         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 504         if (IS_ERR(root)) {
 505                 pr_err("failed to load root directory\n");
 506                 err = PTR_ERR(root);
 507                 goto out_put_alloc_file;
 508         }
 509
 510         sb->s_d_op = &hfsplus_dentry_operations;
 511         sb->s_root = d_make_root(root);
 512         if (!sb->s_root) {
 513                 err = -ENOMEM;
 514                 goto out_put_alloc_file;
 515         }
 516
 517         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 518         str.name = HFSP_HIDDENDIR_NAME;
 519         err = hfs_find_init(sbi->cat_tree, &fd);
 520         if (err)
 521                 goto out_put_root;
 522         err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 523         if (unlikely(err < 0))
 524                 goto out_put_root;
 525         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 526                 hfs_find_exit(&fd);
 527                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) {
 528                         err = -EINVAL;
 529                         goto out_put_root;
 530                 }
 531                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 532                 if (IS_ERR(inode)) {
 533                         err = PTR_ERR(inode);
 534                         goto out_put_root;
 535                 }
 536                 sbi->hidden_dir = inode;
 537         } else
 538                 hfs_find_exit(&fd);
 539
 540         if (!(sb->s_flags & MS_RDONLY)) {
 541                 /*
 542                  * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 543                  * all three are registered with Apple for our use
 544                  */
 545                 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 546                 vhdr->modify_date = hfsp_now2mt();
 547                 be32_add_cpu(&vhdr->write_count, 1);
 548                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 549                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 550                 hfsplus_sync_fs(sb, 1);
 551
 552                 if (!sbi->hidden_dir) {
 553                         mutex_lock(&sbi->vh_mutex);
 554                         sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 555                         if (!sbi->hidden_dir) {
 556                                 mutex_unlock(&sbi->vh_mutex);
 557                                 err = -ENOMEM;
 558                                 goto out_put_root;
 559                         }
 560                         err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
 561                                                  &str, sbi->hidden_dir);
 562                         if (err) {
 563                                 mutex_unlock(&sbi->vh_mutex);
 564                                 goto out_put_hidden_dir;
 565                         }
 566
 567                         err = hfsplus_init_inode_security(sbi->hidden_dir,
 568                                                                 root, &str);
 569                         if (err == -EOPNOTSUPP)
 570                                 err = 0; /* Operation is not supported. */
 571                         else if (err) {
 572                                 /*
 573                                  * Try to delete anyway without
 574                                  * error analysis.
 575                                  */
 576                                 hfsplus_delete_cat(sbi->hidden_dir->i_ino,
 577                                                         root, &str);
 578                                 mutex_unlock(&sbi->vh_mutex);
 579                                 goto out_put_hidden_dir;
 580                         }
 581
 582                         mutex_unlock(&sbi->vh_mutex);
 583                         hfsplus_mark_inode_dirty(sbi->hidden_dir,
 584                                                  HFSPLUS_I_CAT_DIRTY);
 585                 }
 586         }
 587
 588         unload_nls(sbi->nls);
 589         sbi->nls = nls;
 590         return 0;
 591
 592 out_put_hidden_dir:
 593         cancel_delayed_work_sync(&sbi->sync_work);
 594         iput(sbi->hidden_dir);
 595 out_put_root:
 596         dput(sb->s_root);
 597         sb->s_root = NULL;
 598 out_put_alloc_file:
 599         iput(sbi->alloc_file);
 600 out_close_attr_tree:
 601         hfs_btree_close(sbi->attr_tree);
 602 out_close_cat_tree:
 603         hfs_btree_close(sbi->cat_tree);
 604 out_close_ext_tree:
 605         hfs_btree_close(sbi->ext_tree);
 606 out_free_vhdr:
 607         kfree(sbi->s_vhdr_buf);
 608         kfree(sbi->s_backup_vhdr_buf);
 609 out_unload_nls:
 610         unload_nls(sbi->nls);
 611         unload_nls(nls);
 612         kfree(sbi);
 613 out:
 614         return err;
 615 }
 616
 617 MODULE_AUTHOR("Brad Boyer");
 618 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 619 MODULE_LICENSE("GPL");
 620
 621 static struct kmem_cache *hfsplus_inode_cachep;
 622
 623 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 624 {
 625         struct hfsplus_inode_info *i;
 626
 627         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 628         return i ? &i->vfs_inode : NULL;
 629 }
 630
 631 static void hfsplus_i_callback(struct rcu_head *head)
 632 {
 633         struct inode *inode = container_of(head, struct inode, i_rcu);
 634
 635         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
 636 }
 637
 638 static void hfsplus_destroy_inode(struct inode *inode)
 639 {
 640         call_rcu(&inode->i_rcu, hfsplus_i_callback);
 641 }
 642
 643 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 644
 645 static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
 646                           int flags, const char *dev_name, void *data)
 647 {
 648         return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
 649 }
 650
 651 static struct file_system_type hfsplus_fs_type = {
 652         .owner          = THIS_MODULE,
 653         .name           = "hfsplus",
 654         .mount          = hfsplus_mount,
 655         .kill_sb        = kill_block_super,
 656         .fs_flags       = FS_REQUIRES_DEV,
 657 };
 658 MODULE_ALIAS_FS("hfsplus");
 659
 660 static void hfsplus_init_once(void *p)
 661 {
 662         struct hfsplus_inode_info *i = p;
 663
 664         inode_init_once(&i->vfs_inode);
 665 }
 666
 667 static int __init init_hfsplus_fs(void)
 668 {
 669         int err;
 670
 671         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 672                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
 673                 hfsplus_init_once);
 674         if (!hfsplus_inode_cachep)
 675                 return -ENOMEM;
 676         err = hfsplus_create_attr_tree_cache();
 677         if (err)
 678                 goto destroy_inode_cache;
 679         err = register_filesystem(&hfsplus_fs_type);
 680         if (err)
 681                 goto destroy_attr_tree_cache;
 682         return 0;
 683
 684 destroy_attr_tree_cache:
 685         hfsplus_destroy_attr_tree_cache();
 686
 687 destroy_inode_cache:
 688         kmem_cache_destroy(hfsplus_inode_cachep);
 689
 690         return err;
 691 }
 692
 693 static void __exit exit_hfsplus_fs(void)
 694 {
 695         unregister_filesystem(&hfsplus_fs_type);
 696
 697         /*
 698          * Make sure all delayed rcu free inodes are flushed before we
 699          * destroy cache.
 700          */
 701         rcu_barrier();
 702         hfsplus_destroy_attr_tree_cache();
 703         kmem_cache_destroy(hfsplus_inode_cachep);
 704 }
 705
 706 module_init(init_hfsplus_fs)
 707 module_exit(exit_hfsplus_fs)