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