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_final(&inode->i_data);
 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         sync_filesystem(sb);
 327         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 328                 return 0;
 329         if (!(*flags & MS_RDONLY)) {
 330                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
 331                 int force = 0;
 332
 333                 if (!hfsplus_parse_options_remount(data, &force))
 334                         return -EINVAL;
 335
 336                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 337                         pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  leaving read-only.\n");
 338                         sb->s_flags |= MS_RDONLY;
 339                         *flags |= MS_RDONLY;
 340                 } else if (force) {
 341                         /* nothing */
 342                 } else if (vhdr->attributes &
 343                                 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 344                         pr_warn("filesystem is marked locked, leaving read-only.\n");
 345                         sb->s_flags |= MS_RDONLY;
 346                         *flags |= MS_RDONLY;
 347                 } else if (vhdr->attributes &
 348                                 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 349                         pr_warn("filesystem is marked journaled, leaving read-only.\n");
 350                         sb->s_flags |= MS_RDONLY;
 351                         *flags |= MS_RDONLY;
 352                 }
 353         }
 354         return 0;
 355 }
 356
 357 static const struct super_operations hfsplus_sops = {
 358         .alloc_inode    = hfsplus_alloc_inode,
 359         .destroy_inode  = hfsplus_destroy_inode,
 360         .write_inode    = hfsplus_write_inode,
 361         .evict_inode    = hfsplus_evict_inode,
 362         .put_super      = hfsplus_put_super,
 363         .sync_fs        = hfsplus_sync_fs,
 364         .statfs         = hfsplus_statfs,
 365         .remount_fs     = hfsplus_remount,
 366         .show_options   = hfsplus_show_options,
 367 };
 368
 369 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 370 {
 371         struct hfsplus_vh *vhdr;
 372         struct hfsplus_sb_info *sbi;
 373         hfsplus_cat_entry entry;
 374         struct hfs_find_data fd;
 375         struct inode *root, *inode;
 376         struct qstr str;
 377         struct nls_table *nls = NULL;
 378         u64 last_fs_block, last_fs_page;
 379         int err;
 380
 381         err = -ENOMEM;
 382         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 383         if (!sbi)
 384                 goto out;
 385
 386         sb->s_fs_info = sbi;
 387         mutex_init(&sbi->alloc_mutex);
 388         mutex_init(&sbi->vh_mutex);
 389         spin_lock_init(&sbi->work_lock);
 390         INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
 391         hfsplus_fill_defaults(sbi);
 392
 393         err = -EINVAL;
 394         if (!hfsplus_parse_options(data, sbi)) {
 395                 pr_err("unable to parse mount options\n");
 396                 goto out_unload_nls;
 397         }
 398
 399         /* temporarily use utf8 to correctly find the hidden dir below */
 400         nls = sbi->nls;
 401         sbi->nls = load_nls("utf8");
 402         if (!sbi->nls) {
 403                 pr_err("unable to load nls for utf8\n");
 404                 goto out_unload_nls;
 405         }
 406
 407         /* Grab the volume header */
 408         if (hfsplus_read_wrapper(sb)) {
 409                 if (!silent)
 410                         pr_warn("unable to find HFS+ superblock\n");
 411                 goto out_unload_nls;
 412         }
 413         vhdr = sbi->s_vhdr;
 414
 415         /* Copy parts of the volume header into the superblock */
 416         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 417         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 418             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 419                 pr_err("wrong filesystem version\n");
 420                 goto out_free_vhdr;
 421         }
 422         sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
 423         sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
 424         sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
 425         sbi->file_count = be32_to_cpu(vhdr->file_count);
 426         sbi->folder_count = be32_to_cpu(vhdr->folder_count);
 427         sbi->data_clump_blocks =
 428                 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
 429         if (!sbi->data_clump_blocks)
 430                 sbi->data_clump_blocks = 1;
 431         sbi->rsrc_clump_blocks =
 432                 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
 433         if (!sbi->rsrc_clump_blocks)
 434                 sbi->rsrc_clump_blocks = 1;
 435
 436         err = -EFBIG;
 437         last_fs_block = sbi->total_blocks - 1;
 438         last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
 439                         PAGE_CACHE_SHIFT;
 440
 441         if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
 442             (last_fs_page > (pgoff_t)(~0ULL))) {
 443                 pr_err("filesystem size too large\n");
 444                 goto out_free_vhdr;
 445         }
 446
 447         /* Set up operations so we can load metadata */
 448         sb->s_op = &hfsplus_sops;
 449         sb->s_maxbytes = MAX_LFS_FILESIZE;
 450
 451         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 452                 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  mounting read-only.\n");
 453                 sb->s_flags |= MS_RDONLY;
 454         } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
 455                 /* nothing */
 456         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 457                 pr_warn("Filesystem is marked locked, mounting read-only.\n");
 458                 sb->s_flags |= MS_RDONLY;
 459         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
 460                         !(sb->s_flags & MS_RDONLY)) {
 461                 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
 462                 sb->s_flags |= MS_RDONLY;
 463         }
 464
 465         err = -EINVAL;
 466
 467         /* Load metadata objects (B*Trees) */
 468         sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 469         if (!sbi->ext_tree) {
 470                 pr_err("failed to load extents file\n");
 471                 goto out_free_vhdr;
 472         }
 473         sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 474         if (!sbi->cat_tree) {
 475                 pr_err("failed to load catalog file\n");
 476                 goto out_close_ext_tree;
 477         }
 478         atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
 479         if (vhdr->attr_file.total_blocks != 0) {
 480                 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
 481                 if (!sbi->attr_tree) {
 482                         pr_err("failed to load attributes file\n");
 483                         goto out_close_cat_tree;
 484                 }
 485                 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
 486         }
 487         sb->s_xattr = hfsplus_xattr_handlers;
 488
 489         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 490         if (IS_ERR(inode)) {
 491                 pr_err("failed to load allocation file\n");
 492                 err = PTR_ERR(inode);
 493                 goto out_close_attr_tree;
 494         }
 495         sbi->alloc_file = inode;
 496
 497         /* Load the root directory */
 498         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 499         if (IS_ERR(root)) {
 500                 pr_err("failed to load root directory\n");
 501                 err = PTR_ERR(root);
 502                 goto out_put_alloc_file;
 503         }
 504
 505         sb->s_d_op = &hfsplus_dentry_operations;
 506         sb->s_root = d_make_root(root);
 507         if (!sb->s_root) {
 508                 err = -ENOMEM;
 509                 goto out_put_alloc_file;
 510         }
 511
 512         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 513         str.name = HFSP_HIDDENDIR_NAME;
 514         err = hfs_find_init(sbi->cat_tree, &fd);
 515         if (err)
 516                 goto out_put_root;
 517         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 518         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 519                 hfs_find_exit(&fd);
 520                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 521                         goto out_put_root;
 522                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 523                 if (IS_ERR(inode)) {
 524                         err = PTR_ERR(inode);
 525                         goto out_put_root;
 526                 }
 527                 sbi->hidden_dir = inode;
 528         } else
 529                 hfs_find_exit(&fd);
 530
 531         if (!(sb->s_flags & MS_RDONLY)) {
 532                 /*
 533                  * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 534                  * all three are registered with Apple for our use
 535                  */
 536                 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 537                 vhdr->modify_date = hfsp_now2mt();
 538                 be32_add_cpu(&vhdr->write_count, 1);
 539                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 540                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 541                 hfsplus_sync_fs(sb, 1);
 542
 543                 if (!sbi->hidden_dir) {
 544                         mutex_lock(&sbi->vh_mutex);
 545                         sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 546                         if (!sbi->hidden_dir) {
 547                                 mutex_unlock(&sbi->vh_mutex);
 548                                 err = -ENOMEM;
 549                                 goto out_put_root;
 550                         }
 551                         err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
 552                                                  &str, sbi->hidden_dir);
 553                         if (err) {
 554                                 mutex_unlock(&sbi->vh_mutex);
 555                                 goto out_put_hidden_dir;
 556                         }
 557
 558                         err = hfsplus_init_inode_security(sbi->hidden_dir,
 559                                                                 root, &str);
 560                         if (err == -EOPNOTSUPP)
 561                                 err = 0; /* Operation is not supported. */
 562                         else if (err) {
 563                                 /*
 564                                  * Try to delete anyway without
 565                                  * error analysis.
 566                                  */
 567                                 hfsplus_delete_cat(sbi->hidden_dir->i_ino,
 568                                                         root, &str);
 569                                 mutex_unlock(&sbi->vh_mutex);
 570                                 goto out_put_hidden_dir;
 571                         }
 572
 573                         mutex_unlock(&sbi->vh_mutex);
 574                         hfsplus_mark_inode_dirty(sbi->hidden_dir,
 575                                                  HFSPLUS_I_CAT_DIRTY);
 576                 }
 577         }
 578
 579         unload_nls(sbi->nls);
 580         sbi->nls = nls;
 581         return 0;
 582
 583 out_put_hidden_dir:
 584         iput(sbi->hidden_dir);
 585 out_put_root:
 586         dput(sb->s_root);
 587         sb->s_root = NULL;
 588 out_put_alloc_file:
 589         iput(sbi->alloc_file);
 590 out_close_attr_tree:
 591         hfs_btree_close(sbi->attr_tree);
 592 out_close_cat_tree:
 593         hfs_btree_close(sbi->cat_tree);
 594 out_close_ext_tree:
 595         hfs_btree_close(sbi->ext_tree);
 596 out_free_vhdr:
 597         kfree(sbi->s_vhdr_buf);
 598         kfree(sbi->s_backup_vhdr_buf);
 599 out_unload_nls:
 600         unload_nls(sbi->nls);
 601         unload_nls(nls);
 602         kfree(sbi);
 603 out:
 604         return err;
 605 }
 606
 607 MODULE_AUTHOR("Brad Boyer");
 608 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 609 MODULE_LICENSE("GPL");
 610
 611 static struct kmem_cache *hfsplus_inode_cachep;
 612
 613 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 614 {
 615         struct hfsplus_inode_info *i;
 616
 617         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 618         return i ? &i->vfs_inode : NULL;
 619 }
 620
 621 static void hfsplus_i_callback(struct rcu_head *head)
 622 {
 623         struct inode *inode = container_of(head, struct inode, i_rcu);
 624
 625         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
 626 }
 627
 628 static void hfsplus_destroy_inode(struct inode *inode)
 629 {
 630         call_rcu(&inode->i_rcu, hfsplus_i_callback);
 631 }
 632
 633 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 634
 635 static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
 636                           int flags, const char *dev_name, void *data)
 637 {
 638         return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
 639 }
 640
 641 static struct file_system_type hfsplus_fs_type = {
 642         .owner          = THIS_MODULE,
 643         .name           = "hfsplus",
 644         .mount          = hfsplus_mount,
 645         .kill_sb        = kill_block_super,
 646         .fs_flags       = FS_REQUIRES_DEV,
 647 };
 648 MODULE_ALIAS_FS("hfsplus");
 649
 650 static void hfsplus_init_once(void *p)
 651 {
 652         struct hfsplus_inode_info *i = p;
 653
 654         inode_init_once(&i->vfs_inode);
 655 }
 656
 657 static int __init init_hfsplus_fs(void)
 658 {
 659         int err;
 660
 661         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 662                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 663                 hfsplus_init_once);
 664         if (!hfsplus_inode_cachep)
 665                 return -ENOMEM;
 666         err = hfsplus_create_attr_tree_cache();
 667         if (err)
 668                 goto destroy_inode_cache;
 669         err = register_filesystem(&hfsplus_fs_type);
 670         if (err)
 671                 goto destroy_attr_tree_cache;
 672         return 0;
 673
 674 destroy_attr_tree_cache:
 675         hfsplus_destroy_attr_tree_cache();
 676
 677 destroy_inode_cache:
 678         kmem_cache_destroy(hfsplus_inode_cachep);
 679
 680         return err;
 681 }
 682
 683 static void __exit exit_hfsplus_fs(void)
 684 {
 685         unregister_filesystem(&hfsplus_fs_type);
 686
 687         /*
 688          * Make sure all delayed rcu free inodes are flushed before we
 689          * destroy cache.
 690          */
 691         rcu_barrier();
 692         hfsplus_destroy_attr_tree_cache();
 693         kmem_cache_destroy(hfsplus_inode_cachep);
 694 }
 695
 696 module_init(init_hfsplus_fs)
 697 module_exit(exit_hfsplus_fs)