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 ([email protected])
   7  * (C) 2003 Ardis Technologies <[email protected]>
   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/fs_context.h>
  18 #include <linux/slab.h>
  19 #include <linux/vfs.h>
  20 #include <linux/nls.h>
  21
  22 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
  23 static void hfsplus_free_inode(struct inode *inode);
  24
  25 #include "hfsplus_fs.h"
  26 #include "xattr.h"
  27
  28 static int hfsplus_system_read_inode(struct inode *inode)
  29 {
  30         struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
  31
  32         switch (inode->i_ino) {
  33         case HFSPLUS_EXT_CNID:
  34                 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
  35                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  36                 break;
  37         case HFSPLUS_CAT_CNID:
  38                 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
  39                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  40                 break;
  41         case HFSPLUS_ALLOC_CNID:
  42                 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
  43                 inode->i_mapping->a_ops = &hfsplus_aops;
  44                 break;
  45         case HFSPLUS_START_CNID:
  46                 hfsplus_inode_read_fork(inode, &vhdr->start_file);
  47                 break;
  48         case HFSPLUS_ATTR_CNID:
  49                 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
  50                 inode->i_mapping->a_ops = &hfsplus_btree_aops;
  51                 break;
  52         default:
  53                 return -EIO;
  54         }
  55
  56         return 0;
  57 }
  58
  59 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
  60 {
  61         struct hfs_find_data fd;
  62         struct inode *inode;
  63         int err;
  64
  65         inode = iget_locked(sb, ino);
  66         if (!inode)
  67                 return ERR_PTR(-ENOMEM);
  68         if (!(inode->i_state & I_NEW))
  69                 return inode;
  70
  71         INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
  72         spin_lock_init(&HFSPLUS_I(inode)->open_dir_lock);
  73         mutex_init(&HFSPLUS_I(inode)->extents_lock);
  74         HFSPLUS_I(inode)->flags = 0;
  75         HFSPLUS_I(inode)->extent_state = 0;
  76         HFSPLUS_I(inode)->rsrc_inode = NULL;
  77         atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
  78
  79         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
  80             inode->i_ino == HFSPLUS_ROOT_CNID) {
  81                 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
  82                 if (!err) {
  83                         err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
  84                         if (!err)
  85                                 err = hfsplus_cat_read_inode(inode, &fd);
  86                         hfs_find_exit(&fd);
  87                 }
  88         } else {
  89                 err = hfsplus_system_read_inode(inode);
  90         }
  91
  92         if (err) {
  93                 iget_failed(inode);
  94                 return ERR_PTR(err);
  95         }
  96
  97         unlock_new_inode(inode);
  98         return inode;
  99 }
 100
 101 static int hfsplus_system_write_inode(struct inode *inode)
 102 {
 103         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
 104         struct hfsplus_vh *vhdr = sbi->s_vhdr;
 105         struct hfsplus_fork_raw *fork;
 106         struct hfs_btree *tree = NULL;
 107
 108         switch (inode->i_ino) {
 109         case HFSPLUS_EXT_CNID:
 110                 fork = &vhdr->ext_file;
 111                 tree = sbi->ext_tree;
 112                 break;
 113         case HFSPLUS_CAT_CNID:
 114                 fork = &vhdr->cat_file;
 115                 tree = sbi->cat_tree;
 116                 break;
 117         case HFSPLUS_ALLOC_CNID:
 118                 fork = &vhdr->alloc_file;
 119                 break;
 120         case HFSPLUS_START_CNID:
 121                 fork = &vhdr->start_file;
 122                 break;
 123         case HFSPLUS_ATTR_CNID:
 124                 fork = &vhdr->attr_file;
 125                 tree = sbi->attr_tree;
 126                 break;
 127         default:
 128                 return -EIO;
 129         }
 130
 131         if (fork->total_size != cpu_to_be64(inode->i_size)) {
 132                 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
 133                 hfsplus_mark_mdb_dirty(inode->i_sb);
 134         }
 135         hfsplus_inode_write_fork(inode, fork);
 136         if (tree) {
 137                 int err = hfs_btree_write(tree);
 138
 139                 if (err) {
 140                         pr_err("b-tree write err: %d, ino %lu\n",
 141                                err, inode->i_ino);
 142                         return err;
 143                 }
 144         }
 145         return 0;
 146 }
 147
 148 static int hfsplus_write_inode(struct inode *inode,
 149                 struct writeback_control *wbc)
 150 {
 151         int err;
 152
 153         hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
 154
 155         err = hfsplus_ext_write_extent(inode);
 156         if (err)
 157                 return err;
 158
 159         if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
 160             inode->i_ino == HFSPLUS_ROOT_CNID)
 161                 return hfsplus_cat_write_inode(inode);
 162         else
 163                 return hfsplus_system_write_inode(inode);
 164 }
 165
 166 static void hfsplus_evict_inode(struct inode *inode)
 167 {
 168         hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
 169         truncate_inode_pages_final(&inode->i_data);
 170         clear_inode(inode);
 171         if (HFSPLUS_IS_RSRC(inode)) {
 172                 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
 173                 iput(HFSPLUS_I(inode)->rsrc_inode);
 174         }
 175 }
 176
 177 static int hfsplus_sync_fs(struct super_block *sb, int wait)
 178 {
 179         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 180         struct hfsplus_vh *vhdr = sbi->s_vhdr;
 181         int write_backup = 0;
 182         int error, error2;
 183
 184         if (!wait)
 185                 return 0;
 186
 187         hfs_dbg(SUPER, "hfsplus_sync_fs\n");
 188
 189         /*
 190          * Explicitly write out the special metadata inodes.
 191          *
 192          * While these special inodes are marked as hashed and written
 193          * out peridocically by the flusher threads we redirty them
 194          * during writeout of normal inodes, and thus the life lock
 195          * prevents us from getting the latest state to disk.
 196          */
 197         error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
 198         error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
 199         if (!error)
 200                 error = error2;
 201         if (sbi->attr_tree) {
 202                 error2 =
 203                     filemap_write_and_wait(sbi->attr_tree->inode->i_mapping);
 204                 if (!error)
 205                         error = error2;
 206         }
 207         error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
 208         if (!error)
 209                 error = error2;
 210
 211         mutex_lock(&sbi->vh_mutex);
 212         mutex_lock(&sbi->alloc_mutex);
 213         vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
 214         vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
 215         vhdr->folder_count = cpu_to_be32(sbi->folder_count);
 216         vhdr->file_count = cpu_to_be32(sbi->file_count);
 217
 218         if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
 219                 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
 220                 write_backup = 1;
 221         }
 222
 223         error2 = hfsplus_submit_bio(sb,
 224                                    sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
 225                                    sbi->s_vhdr_buf, NULL, REQ_OP_WRITE |
 226                                    REQ_SYNC);
 227         if (!error)
 228                 error = error2;
 229         if (!write_backup)
 230                 goto out;
 231
 232         error2 = hfsplus_submit_bio(sb,
 233                                   sbi->part_start + sbi->sect_count - 2,
 234                                   sbi->s_backup_vhdr_buf, NULL, REQ_OP_WRITE |
 235                                   REQ_SYNC);
 236         if (!error)
 237                 error2 = error;
 238 out:
 239         mutex_unlock(&sbi->alloc_mutex);
 240         mutex_unlock(&sbi->vh_mutex);
 241
 242         if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
 243                 blkdev_issue_flush(sb->s_bdev);
 244
 245         return error;
 246 }
 247
 248 static void delayed_sync_fs(struct work_struct *work)
 249 {
 250         int err;
 251         struct hfsplus_sb_info *sbi;
 252
 253         sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
 254
 255         spin_lock(&sbi->work_lock);
 256         sbi->work_queued = 0;
 257         spin_unlock(&sbi->work_lock);
 258
 259         err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
 260         if (err)
 261                 pr_err("delayed sync fs err %d\n", err);
 262 }
 263
 264 void hfsplus_mark_mdb_dirty(struct super_block *sb)
 265 {
 266         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 267         unsigned long delay;
 268
 269         if (sb_rdonly(sb))
 270                 return;
 271
 272         spin_lock(&sbi->work_lock);
 273         if (!sbi->work_queued) {
 274                 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 275                 queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
 276                 sbi->work_queued = 1;
 277         }
 278         spin_unlock(&sbi->work_lock);
 279 }
 280
 281 static void delayed_free(struct rcu_head *p)
 282 {
 283         struct hfsplus_sb_info *sbi = container_of(p, struct hfsplus_sb_info, rcu);
 284
 285         unload_nls(sbi->nls);
 286         kfree(sbi);
 287 }
 288
 289 static void hfsplus_put_super(struct super_block *sb)
 290 {
 291         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 292
 293         hfs_dbg(SUPER, "hfsplus_put_super\n");
 294
 295         cancel_delayed_work_sync(&sbi->sync_work);
 296
 297         if (!sb_rdonly(sb) && sbi->s_vhdr) {
 298                 struct hfsplus_vh *vhdr = sbi->s_vhdr;
 299
 300                 vhdr->modify_date = hfsp_now2mt();
 301                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 302                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 303
 304                 hfsplus_sync_fs(sb, 1);
 305         }
 306
 307         iput(sbi->alloc_file);
 308         iput(sbi->hidden_dir);
 309         hfs_btree_close(sbi->attr_tree);
 310         hfs_btree_close(sbi->cat_tree);
 311         hfs_btree_close(sbi->ext_tree);
 312         kfree(sbi->s_vhdr_buf);
 313         kfree(sbi->s_backup_vhdr_buf);
 314         call_rcu(&sbi->rcu, delayed_free);
 315 }
 316
 317 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 318 {
 319         struct super_block *sb = dentry->d_sb;
 320         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 321         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 322
 323         buf->f_type = HFSPLUS_SUPER_MAGIC;
 324         buf->f_bsize = sb->s_blocksize;
 325         buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
 326         buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
 327         buf->f_bavail = buf->f_bfree;
 328         buf->f_files = 0xFFFFFFFF;
 329         buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
 330         buf->f_fsid = u64_to_fsid(id);
 331         buf->f_namelen = HFSPLUS_MAX_STRLEN;
 332
 333         return 0;
 334 }
 335
 336 static int hfsplus_reconfigure(struct fs_context *fc)
 337 {
 338         struct super_block *sb = fc->root->d_sb;
 339
 340         sync_filesystem(sb);
 341         if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb))
 342                 return 0;
 343         if (!(fc->sb_flags & SB_RDONLY)) {
 344                 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 345                 struct hfsplus_vh *vhdr = sbi->s_vhdr;
 346
 347                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 348                         pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended.  leaving read-only.\n");
 349                         sb->s_flags |= SB_RDONLY;
 350                         fc->sb_flags |= SB_RDONLY;
 351                 } else if (test_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
 352                         /* nothing */
 353                 } else if (vhdr->attributes &
 354                                 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 355                         pr_warn("filesystem is marked locked, leaving read-only.\n");
 356                         sb->s_flags |= SB_RDONLY;
 357                         fc->sb_flags |= SB_RDONLY;
 358                 } else if (vhdr->attributes &
 359                                 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 360                         pr_warn("filesystem is marked journaled, leaving read-only.\n");
 361                         sb->s_flags |= SB_RDONLY;
 362                         fc->sb_flags |= SB_RDONLY;
 363                 }
 364         }
 365         return 0;
 366 }
 367
 368 static const struct super_operations hfsplus_sops = {
 369         .alloc_inode    = hfsplus_alloc_inode,
 370         .free_inode     = hfsplus_free_inode,
 371         .write_inode    = hfsplus_write_inode,
 372         .evict_inode    = hfsplus_evict_inode,
 373         .put_super      = hfsplus_put_super,
 374         .sync_fs        = hfsplus_sync_fs,
 375         .statfs         = hfsplus_statfs,
 376         .show_options   = hfsplus_show_options,
 377 };
 378
 379 static int hfsplus_fill_super(struct super_block *sb, struct fs_context *fc)
 380 {
 381         struct hfsplus_vh *vhdr;
 382         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 383         hfsplus_cat_entry entry;
 384         struct hfs_find_data fd;
 385         struct inode *root, *inode;
 386         struct qstr str;
 387         struct nls_table *nls;
 388         u64 last_fs_block, last_fs_page;
 389         int silent = fc->sb_flags & SB_SILENT;
 390         int err;
 391
 392         mutex_init(&sbi->alloc_mutex);
 393         mutex_init(&sbi->vh_mutex);
 394         spin_lock_init(&sbi->work_lock);
 395         INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
 396
 397         err = -EINVAL;
 398         if (!sbi->nls) {
 399                 /* try utf8 first, as this is the old default behaviour */
 400                 sbi->nls = load_nls("utf8");
 401                 if (!sbi->nls)
 402                         sbi->nls = load_nls_default();
 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         return err;
 615 }
 616
 617 MODULE_AUTHOR("Brad Boyer");
 618 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 619 MODULE_LICENSE("GPL");
 620
 621 static struct kmem_cache *hfsplus_inode_cachep;
 622
 623 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 624 {
 625         struct hfsplus_inode_info *i;
 626
 627         i = alloc_inode_sb(sb, hfsplus_inode_cachep, GFP_KERNEL);
 628         return i ? &i->vfs_inode : NULL;
 629 }
 630
 631 static void hfsplus_free_inode(struct inode *inode)
 632 {
 633         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
 634 }
 635
 636 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 637
 638 static int hfsplus_get_tree(struct fs_context *fc)
 639 {
 640         return get_tree_bdev(fc, hfsplus_fill_super);
 641 }
 642
 643 static void hfsplus_free_fc(struct fs_context *fc)
 644 {
 645         kfree(fc->s_fs_info);
 646 }
 647
 648 static const struct fs_context_operations hfsplus_context_ops = {
 649         .parse_param    = hfsplus_parse_param,
 650         .get_tree       = hfsplus_get_tree,
 651         .reconfigure    = hfsplus_reconfigure,
 652         .free           = hfsplus_free_fc,
 653 };
 654
 655 static int hfsplus_init_fs_context(struct fs_context *fc)
 656 {
 657         struct hfsplus_sb_info *sbi;
 658
 659         sbi = kzalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
 660         if (!sbi)
 661                 return -ENOMEM;
 662
 663         if (fc->purpose != FS_CONTEXT_FOR_RECONFIGURE)
 664                 hfsplus_fill_defaults(sbi);
 665
 666         fc->s_fs_info = sbi;
 667         fc->ops = &hfsplus_context_ops;
 668
 669         return 0;
 670 }
 671
 672 static struct file_system_type hfsplus_fs_type = {
 673         .owner          = THIS_MODULE,
 674         .name           = "hfsplus",
 675         .kill_sb        = kill_block_super,
 676         .fs_flags       = FS_REQUIRES_DEV,
 677         .init_fs_context = hfsplus_init_fs_context,
 678 };
 679 MODULE_ALIAS_FS("hfsplus");
 680
 681 static void hfsplus_init_once(void *p)
 682 {
 683         struct hfsplus_inode_info *i = p;
 684
 685         inode_init_once(&i->vfs_inode);
 686 }
 687
 688 static int __init init_hfsplus_fs(void)
 689 {
 690         int err;
 691
 692         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 693                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
 694                 hfsplus_init_once);
 695         if (!hfsplus_inode_cachep)
 696                 return -ENOMEM;
 697         err = hfsplus_create_attr_tree_cache();
 698         if (err)
 699                 goto destroy_inode_cache;
 700         err = register_filesystem(&hfsplus_fs_type);
 701         if (err)
 702                 goto destroy_attr_tree_cache;
 703         return 0;
 704
 705 destroy_attr_tree_cache:
 706         hfsplus_destroy_attr_tree_cache();
 707
 708 destroy_inode_cache:
 709         kmem_cache_destroy(hfsplus_inode_cachep);
 710
 711         return err;
 712 }
 713
 714 static void __exit exit_hfsplus_fs(void)
 715 {
 716         unregister_filesystem(&hfsplus_fs_type);
 717
 718         /*
 719          * Make sure all delayed rcu free inodes are flushed before we
 720          * destroy cache.
 721          */
 722         rcu_barrier();
 723         hfsplus_destroy_attr_tree_cache();
 724         kmem_cache_destroy(hfsplus_inode_cachep);
 725 }
 726
 727 module_init(init_hfsplus_fs)
 728 module_exit(exit_hfsplus_fs)