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