fs/hfsplus/super.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/fs/hfsplus/super.c
   4  *
   5  * Copyright (C) 2001
   6  * Brad Boyer (flar@allandria.com)
   7  * (C) 2003 Ardis Technologies <roman@ardistech.com>
   8  *
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/pagemap.h>
  14 #include <linux/blkdev.h>
  15 #include <linux/backing-dev.h>
  16 #include <linux/fs.h>
  17 #include <linux/slab.h>
  18 #include <linux/vfs.h>
  19 #include <linux/nls.h>
  20
  21 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
  22 static void hfsplus_free_inode(struct inode *inode);
  23
  24 #include "hfsplus_fs.h"
  25 #include "xattr.h"
  26
  27 static int hfsplus_system_read_inode(struct inode *inode)
  28 {
  29         struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
  30
  31         switch (inode->i_ino) {
  32         case HFSPLUS_EXT_CNID:
  33                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
  34                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  35                 break;
  36         case HFSPLUS_CAT_CNID:
  37                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
  38                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  39                 break;
  40         case HFSPLUS_ALLOC_CNID:
  41                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
  42                 inode->i_mapping->a_ops = &hfsplus_aops;
  43                 break;
  44         case HFSPLUS_START_CNID:
  45                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
  46                 break;
  47         case HFSPLUS_ATTR_CNID:
  48                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
  49                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  50                 break;
  51         default:
  52                 return -EIO;
  53         }
  54
  55         return 0;
  56 }
  57
  58 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
  59 {
  60         struct hfs_find_data fd;
  61         struct inode *inode;
  62         int err;
  63
  64         inode = iget_locked(sb, ino);
  65         if (!inode)
  66                 return ERR_PTR(-ENOMEM);
  67         if (!(inode->i_state & I_NEW))
  68                 return inode;
  69
  70         INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
  71         spin_lock_init(&HFSPLUS_I(inode)->open_dir_lock);
  72         mutex_init(&HFSPLUS_I(inode)->extents_lock);
  73         HFSPLUS_I(inode)->flags = 0;
  74         HFSPLUS_I(inode)->extent_state = 0;
  75         HFSPLUS_I(inode)->rsrc_inode = NULL;
  76         atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
  77
  78         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
  79             inode->i_ino == HFSPLUS_ROOT_CNID) {
  80                 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
  81                 if (!err) {
  82                         err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
  83                         if (!err)
  84                                 err = hfsplus_cat_read_inode(inode, &fd);
  85                         hfs_find_exit(&fd);
  86                 }
  87         } else {
  88                 err = hfsplus_system_read_inode(inode);
  89         }
  90
  91         if (err) {
  92                 iget_failed(inode);
  93                 return ERR_PTR(err);
  94         }
  95
  96         unlock_new_inode(inode);
  97         return inode;
  98 }
  99
 100 static int hfsplus_system_write_inode(struct inode *inode)
 101 {
 102         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
 103         struct hfsplus_vh *vhdr = sbi->s_vhdr;
 104         struct hfsplus_fork_raw *fork;
 105         struct hfs_btree *tree = NULL;
 106
 107         switch (inode->i_ino) {
 108         case HFSPLUS_EXT_CNID:
 109                 fork = &vhdr->ext_file;
 110                 tree = sbi->ext_tree;
 111                 break;
 112         case HFSPLUS_CAT_CNID:
 113                 fork = &vhdr->cat_file;
 114                 tree = sbi->cat_tree;
 115                 break;
 116         case HFSPLUS_ALLOC_CNID:
 117                 fork = &vhdr->alloc_file;
 118                 break;
 119         case HFSPLUS_START_CNID:
 120                 fork = &vhdr->start_file;
 121                 break;
 122         case HFSPLUS_ATTR_CNID:
 123                 fork = &vhdr->attr_file;
 124                 tree = sbi->attr_tree;
 125                 break;
 126         default:
 127                 return -EIO;
 128         }
 129
 130         if (fork->total_size != cpu_to_be64(inode->i_size)) {
 131                 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
 132                 hfsplus_mark_mdb_dirty(inode->i_sb);
 133         }
 134         hfsplus_inode_write_fork(inode, fork);
 135         if (tree) {
 136                 int err = hfs_btree_write(tree);
 137
 138                 if (err) {
 139                         pr_err("b-tree write err: %d, ino %lu\n",
 140                                err, inode->i_ino);
 141                         return err;
 142                 }
 143         }
 144         return 0;
 145 }
 146
 147 static int hfsplus_write_inode(struct inode *inode,
 148                 struct writeback_control *wbc)
 149 {
 150         int err;
 151
 152         hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
 153
 154         err = hfsplus_ext_write_extent(inode);
 155         if (err)
 156                 return err;
 157
 158         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
 159             inode->i_ino == HFSPLUS_ROOT_CNID)
 160                 return hfsplus_cat_write_inode(inode);
 161         else
 162                 return hfsplus_system_write_inode(inode);
 163 }
 164
 165 static void hfsplus_evict_inode(struct inode *inode)
 166 {
 167         hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
 168         truncate_inode_pages_final(&inode->i_data);
 169         clear_inode(inode);
 170         if (HFSPLUS_IS_RSRC(inode)) {
 171                 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
 172                 iput(HFSPLUS_I(inode)->rsrc_inode);
 173         }
 174 }
 175
 176 static int hfsplus_sync_fs(struct super_block *sb, int wait)
 177 {
 178         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 179         struct hfsplus_vh *vhdr = sbi->s_vhdr;
 180         int write_backup = 0;
 181         int error, error2;
 182
 183         if (!wait)
 184                 return 0;
 185
 186         hfs_dbg(SUPER, "hfsplus_sync_fs\n");
 187
 188         /*
 189          * Explicitly write out the special metadata inodes.
 190          *
 191          * While these special inodes are marked as hashed and written
 192          * out peridocically by the flusher threads we redirty them
 193          * during writeout of normal inodes, and thus the life lock
 194          * prevents us from getting the latest state to disk.
 195          */
 196         error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
 197         error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
 198         if (!error)
 199                 error = error2;
 200         if (sbi->attr_tree) {
 201                 error2 =
 202                     filemap_write_and_wait(sbi->attr_tree->inode->i_mapping);
 203                 if (!error)
 204                         error = error2;
 205         }
 206         error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
 207         if (!error)
 208                 error = error2;
 209
 210         mutex_lock(&sbi->vh_mutex);
 211         mutex_lock(&sbi->alloc_mutex);
 212         vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
 213         vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
 214         vhdr->folder_count = cpu_to_be32(sbi->folder_count);
 215         vhdr->file_count = cpu_to_be32(sbi->file_count);
 216
 217         if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
 218                 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
 219                 write_backup = 1;
 220         }
 221
 222         error2 = hfsplus_submit_bio(sb,
 223                                    sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
 224                                    sbi->s_vhdr_buf, NULL, REQ_OP_WRITE,
 225                                    REQ_SYNC);
 226         if (!error)
 227                 error = error2;
 228         if (!write_backup)
 229                 goto out;
 230
 231         error2 = hfsplus_submit_bio(sb,
 232                                   sbi->part_start + sbi->sect_count - 2,
 233                                   sbi->s_backup_vhdr_buf, NULL, REQ_OP_WRITE,
 234                                   REQ_SYNC);
 235         if (!error)
 236                 error2 = error;
 237 out:
 238         mutex_unlock(&sbi->alloc_mutex);
 239         mutex_unlock(&sbi->vh_mutex);
 240
 241         if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
 242                 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL);
 243
 244         return error;
 245 }
 246
 247 static void delayed_sync_fs(struct work_struct *work)
 248 {
 249         int err;
 250         struct hfsplus_sb_info *sbi;
 251
 252         sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
 253
 254         spin_lock(&sbi->work_lock);
 255         sbi->work_queued = 0;
 256         spin_unlock(&sbi->work_lock);
 257
 258         err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
 259         if (err)
 260                 pr_err("delayed sync fs err %d\n", err);
 261 }
 262
 263 void hfsplus_mark_mdb_dirty(struct super_block *sb)
 264 {
 265         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 266         unsigned long delay;
 267
 268         if (sb_rdonly(sb))
 269                 return;
 270
 271         spin_lock(&sbi->work_lock);
 272         if (!sbi->work_queued) {
 273                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 274                 queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
 275                 sbi->work_queued = 1;
 276         }
 277         spin_unlock(&sbi->work_lock);
 278 }
 279
 280 static void hfsplus_put_super(struct super_block *sb)
 281 {
 282         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 283
 284         hfs_dbg(SUPER, "hfsplus_put_super\n");
 285
 286         cancel_delayed_work_sync(&sbi->sync_work);
 287
 288         if (!sb_rdonly(sb) && sbi->s_vhdr) {
 289                 struct hfsplus_vh *vhdr = sbi->s_vhdr;
 290
 291                 vhdr->modify_date = hfsp_now2mt();
 292                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 293                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 294
 295                 hfsplus_sync_fs(sb, 1);
 296         }
 297
 298         hfs_btree_close(sbi->attr_tree);
 299         hfs_btree_close(sbi->cat_tree);
 300         hfs_btree_close(sbi->ext_tree);
 301         iput(sbi->alloc_file);
 302         iput(sbi->hidden_dir);
 303         kfree(sbi->s_vhdr_buf);
 304         kfree(sbi->s_backup_vhdr_buf);
 305         unload_nls(sbi->nls);
 306         kfree(sb->s_fs_info);
 307         sb->s_fs_info = NULL;
 308 }
 309
 310 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 311 {
 312         struct super_block *sb = dentry->d_sb;
 313         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 314         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 315
 316         buf->f_type = HFSPLUS_SUPER_MAGIC;
 317         buf->f_bsize = sb->s_blocksize;
 318         buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
 319         buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
 320         buf->f_bavail = buf->f_bfree;
 321         buf->f_files = 0xFFFFFFFF;
 322         buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
 323         buf->f_fsid.val[0] = (u32)id;
 324         buf->f_fsid.val[1] = (u32)(id >> 32);
 325         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 326
 327         return 0;
 328 }
 329
 330 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 331 {
 332         sync_filesystem(sb);
 333         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
 334                 return 0;
 335         if (!(*flags & SB_RDONLY)) {
 336                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
 337                 int force = 0;
 338
 339                 if (!hfsplus_parse_options_remount(data, &force))
 340                         return -EINVAL;
 341
 342                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 343                         pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  leaving read-only.\n");
 344                         sb->s_flags |= SB_RDONLY;
 345                         *flags |= SB_RDONLY;
 346                 } else if (force) {
 347                         /* nothing */
 348                 } else if (vhdr->attributes &
 349                                 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 350                         pr_warn("filesystem is marked locked, leaving read-only.\n");
 351                         sb->s_flags |= SB_RDONLY;
 352                         *flags |= SB_RDONLY;
 353                 } else if (vhdr->attributes &
 354                                 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 355                         pr_warn("filesystem is marked journaled, leaving read-only.\n");
 356                         sb->s_flags |= SB_RDONLY;
 357                         *flags |= SB_RDONLY;
 358                 }
 359         }
 360         return 0;
 361 }
 362
 363 static const struct super_operations hfsplus_sops = {
 364         .alloc_inode    = hfsplus_alloc_inode,
 365         .free_inode     = hfsplus_free_inode,
 366         .write_inode    = hfsplus_write_inode,
 367         .evict_inode    = hfsplus_evict_inode,
 368         .put_super      = hfsplus_put_super,
 369         .sync_fs        = hfsplus_sync_fs,
 370         .statfs         = hfsplus_statfs,
 371         .remount_fs     = hfsplus_remount,
 372         .show_options   = hfsplus_show_options,
 373 };
 374
 375 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 376 {
 377         struct hfsplus_vh *vhdr;
 378         struct hfsplus_sb_info *sbi;
 379         hfsplus_cat_entry entry;
 380         struct hfs_find_data fd;
 381         struct inode *root, *inode;
 382         struct qstr str;
 383         struct nls_table *nls = NULL;
 384         u64 last_fs_block, last_fs_page;
 385         int err;
 386
 387         err = -ENOMEM;
 388         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 389         if (!sbi)
 390                 goto out;
 391
 392         sb->s_fs_info = sbi;
 393         mutex_init(&sbi->alloc_mutex);
 394         mutex_init(&sbi->vh_mutex);
 395         spin_lock_init(&sbi->work_lock);
 396         INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
 397         hfsplus_fill_defaults(sbi);
 398
 399         err = -EINVAL;
 400         if (!hfsplus_parse_options(data, sbi)) {
 401                 pr_err("unable to parse mount options\n");
 402                 goto out_unload_nls;
 403         }
 404
 405         /* temporarily use utf8 to correctly find the hidden dir below */
 406         nls = sbi->nls;
 407         sbi->nls = load_nls("utf8");
 408         if (!sbi->nls) {
 409                 pr_err("unable to load nls for utf8\n");
 410                 goto out_unload_nls;
 411         }
 412
 413         /* Grab the volume header */
 414         if (hfsplus_read_wrapper(sb)) {
 415                 if (!silent)
 416                         pr_warn("unable to find HFS+ superblock\n");
 417                 goto out_unload_nls;
 418         }
 419         vhdr = sbi->s_vhdr;
 420
 421         /* Copy parts of the volume header into the superblock */
 422         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 423         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 424             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 425                 pr_err("wrong filesystem version\n");
 426                 goto out_free_vhdr;
 427         }
 428         sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
 429         sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
 430         sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
 431         sbi->file_count = be32_to_cpu(vhdr->file_count);
 432         sbi->folder_count = be32_to_cpu(vhdr->folder_count);
 433         sbi->data_clump_blocks =
 434                 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
 435         if (!sbi->data_clump_blocks)
 436                 sbi->data_clump_blocks = 1;
 437         sbi->rsrc_clump_blocks =
 438                 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
 439         if (!sbi->rsrc_clump_blocks)
 440                 sbi->rsrc_clump_blocks = 1;
 441
 442         err = -EFBIG;
 443         last_fs_block = sbi->total_blocks - 1;
 444         last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
 445                         PAGE_SHIFT;
 446
 447         if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
 448             (last_fs_page > (pgoff_t)(~0ULL))) {
 449                 pr_err("filesystem size too large\n");
 450                 goto out_free_vhdr;
 451         }
 452
 453         /* Set up operations so we can load metadata */
 454         sb->s_op = &hfsplus_sops;
 455         sb->s_maxbytes = MAX_LFS_FILESIZE;
 456
 457         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 458                 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  mounting read-only.\n");
 459                 sb->s_flags |= SB_RDONLY;
 460         } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
 461                 /* nothing */
 462         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 463                 pr_warn("Filesystem is marked locked, mounting read-only.\n");
 464                 sb->s_flags |= SB_RDONLY;
 465         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
 466                         !sb_rdonly(sb)) {
 467                 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n");
 468                 sb->s_flags |= SB_RDONLY;
 469         }
 470
 471         err = -EINVAL;
 472
 473         /* Load metadata objects (B*Trees) */
 474         sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 475         if (!sbi->ext_tree) {
 476                 pr_err("failed to load extents file\n");
 477                 goto out_free_vhdr;
 478         }
 479         sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 480         if (!sbi->cat_tree) {
 481                 pr_err("failed to load catalog file\n");
 482                 goto out_close_ext_tree;
 483         }
 484         atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
 485         if (vhdr->attr_file.total_blocks != 0) {
 486                 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
 487                 if (!sbi->attr_tree) {
 488                         pr_err("failed to load attributes file\n");
 489                         goto out_close_cat_tree;
 490                 }
 491                 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
 492         }
 493         sb->s_xattr = hfsplus_xattr_handlers;
 494
 495         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 496         if (IS_ERR(inode)) {
 497                 pr_err("failed to load allocation file\n");
 498                 err = PTR_ERR(inode);
 499                 goto out_close_attr_tree;
 500         }
 501         sbi->alloc_file = inode;
 502
 503         /* Load the root directory */
 504         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 505         if (IS_ERR(root)) {
 506                 pr_err("failed to load root directory\n");
 507                 err = PTR_ERR(root);
 508                 goto out_put_alloc_file;
 509         }
 510
 511         sb->s_d_op = &hfsplus_dentry_operations;
 512         sb->s_root = d_make_root(root);
 513         if (!sb->s_root) {
 514                 err = -ENOMEM;
 515                 goto out_put_alloc_file;
 516         }
 517
 518         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 519         str.name = HFSP_HIDDENDIR_NAME;
 520         err = hfs_find_init(sbi->cat_tree, &fd);
 521         if (err)
 522                 goto out_put_root;
 523         err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 524         if (unlikely(err < 0))
 525                 goto out_put_root;
 526         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 527                 hfs_find_exit(&fd);
 528                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) {
 529                         err = -EINVAL;
 530                         goto out_put_root;
 531                 }
 532                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 533                 if (IS_ERR(inode)) {
 534                         err = PTR_ERR(inode);
 535                         goto out_put_root;
 536                 }
 537                 sbi->hidden_dir = inode;
 538         } else
 539                 hfs_find_exit(&fd);
 540
 541         if (!sb_rdonly(sb)) {
 542                 /*
 543                  * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 544                  * all three are registered with Apple for our use
 545                  */
 546                 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 547                 vhdr->modify_date = hfsp_now2mt();
 548                 be32_add_cpu(&vhdr->write_count, 1);
 549                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 550                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 551                 hfsplus_sync_fs(sb, 1);
 552
 553                 if (!sbi->hidden_dir) {
 554                         mutex_lock(&sbi->vh_mutex);
 555                         sbi->hidden_dir = hfsplus_new_inode(sb, root, S_IFDIR);
 556                         if (!sbi->hidden_dir) {
 557                                 mutex_unlock(&sbi->vh_mutex);
 558                                 err = -ENOMEM;
 559                                 goto out_put_root;
 560                         }
 561                         err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
 562                                                  &str, sbi->hidden_dir);
 563                         if (err) {
 564                                 mutex_unlock(&sbi->vh_mutex);
 565                                 goto out_put_hidden_dir;
 566                         }
 567
 568                         err = hfsplus_init_security(sbi->hidden_dir,
 569                                                         root, &str);
 570                         if (err == -EOPNOTSUPP)
 571                                 err = 0; /* Operation is not supported. */
 572                         else if (err) {
 573                                 /*
 574                                  * Try to delete anyway without
 575                                  * error analysis.
 576                                  */
 577                                 hfsplus_delete_cat(sbi->hidden_dir->i_ino,
 578                                                         root, &str);
 579                                 mutex_unlock(&sbi->vh_mutex);
 580                                 goto out_put_hidden_dir;
 581                         }
 582
 583                         mutex_unlock(&sbi->vh_mutex);
 584                         hfsplus_mark_inode_dirty(sbi->hidden_dir,
 585                                                  HFSPLUS_I_CAT_DIRTY);
 586                 }
 587         }
 588
 589         unload_nls(sbi->nls);
 590         sbi->nls = nls;
 591         return 0;
 592
 593 out_put_hidden_dir:
 594         cancel_delayed_work_sync(&sbi->sync_work);
 595         iput(sbi->hidden_dir);
 596 out_put_root:
 597         dput(sb->s_root);
 598         sb->s_root = NULL;
 599 out_put_alloc_file:
 600         iput(sbi->alloc_file);
 601 out_close_attr_tree:
 602         hfs_btree_close(sbi->attr_tree);
 603 out_close_cat_tree:
 604         hfs_btree_close(sbi->cat_tree);
 605 out_close_ext_tree:
 606         hfs_btree_close(sbi->ext_tree);
 607 out_free_vhdr:
 608         kfree(sbi->s_vhdr_buf);
 609         kfree(sbi->s_backup_vhdr_buf);
 610 out_unload_nls:
 611         unload_nls(sbi->nls);
 612         unload_nls(nls);
 613         kfree(sbi);
 614 out:
 615         return err;
 616 }
 617
 618 MODULE_AUTHOR("Brad Boyer");
 619 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 620 MODULE_LICENSE("GPL");
 621
 622 static struct kmem_cache *hfsplus_inode_cachep;
 623
 624 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 625 {
 626         struct hfsplus_inode_info *i;
 627
 628         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 629         return i ? &i->vfs_inode : NULL;
 630 }
 631
 632 static void hfsplus_free_inode(struct inode *inode)
 633 {
 634         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
 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)