fs/hfsplus/inode.c

   1 /*
   2  *  linux/fs/hfsplus/inode.c
   3  *
   4  * Copyright (C) 2001
   5  * Brad Boyer (flar@allandria.com)
   6  * (C) 2003 Ardis Technologies <roman@ardistech.com>
   7  *
   8  * Inode handling routines
   9  */
  10
  11 #include <linux/blkdev.h>
  12 #include <linux/mm.h>
  13 #include <linux/fs.h>
  14 #include <linux/pagemap.h>
  15 #include <linux/mpage.h>
  16 #include <linux/sched.h>
  17
  18 #include "hfsplus_fs.h"
  19 #include "hfsplus_raw.h"
  20 #include "xattr.h"
  21
  22 static int hfsplus_readpage(struct file *file, struct page *page)
  23 {
  24         return block_read_full_page(page, hfsplus_get_block);
  25 }
  26
  27 static int hfsplus_writepage(struct page *page, struct writeback_control *wbc)
  28 {
  29         return block_write_full_page(page, hfsplus_get_block, wbc);
  30 }
  31
  32 static void hfsplus_write_failed(struct address_space *mapping, loff_t to)
  33 {
  34         struct inode *inode = mapping->host;
  35
  36         if (to > inode->i_size) {
  37                 truncate_pagecache(inode, to, inode->i_size);
  38                 hfsplus_file_truncate(inode);
  39         }
  40 }
  41
  42 static int hfsplus_write_begin(struct file *file, struct address_space *mapping,
  43                         loff_t pos, unsigned len, unsigned flags,
  44                         struct page **pagep, void **fsdata)
  45 {
  46         int ret;
  47
  48         *pagep = NULL;
  49         ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
  50                                 hfsplus_get_block,
  51                                 &HFSPLUS_I(mapping->host)->phys_size);
  52         if (unlikely(ret))
  53                 hfsplus_write_failed(mapping, pos + len);
  54
  55         return ret;
  56 }
  57
  58 static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
  59 {
  60         return generic_block_bmap(mapping, block, hfsplus_get_block);
  61 }
  62
  63 static int hfsplus_releasepage(struct page *page, gfp_t mask)
  64 {
  65         struct inode *inode = page->mapping->host;
  66         struct super_block *sb = inode->i_sb;
  67         struct hfs_btree *tree;
  68         struct hfs_bnode *node;
  69         u32 nidx;
  70         int i, res = 1;
  71
  72         switch (inode->i_ino) {
  73         case HFSPLUS_EXT_CNID:
  74                 tree = HFSPLUS_SB(sb)->ext_tree;
  75                 break;
  76         case HFSPLUS_CAT_CNID:
  77                 tree = HFSPLUS_SB(sb)->cat_tree;
  78                 break;
  79         case HFSPLUS_ATTR_CNID:
  80                 tree = HFSPLUS_SB(sb)->attr_tree;
  81                 break;
  82         default:
  83                 BUG();
  84                 return 0;
  85         }
  86         if (!tree)
  87                 return 0;
  88         if (tree->node_size >= PAGE_CACHE_SIZE) {
  89                 nidx = page->index >>
  90                         (tree->node_size_shift - PAGE_CACHE_SHIFT);
  91                 spin_lock(&tree->hash_lock);
  92                 node = hfs_bnode_findhash(tree, nidx);
  93                 if (!node)
  94                         ;
  95                 else if (atomic_read(&node->refcnt))
  96                         res = 0;
  97                 if (res && node) {
  98                         hfs_bnode_unhash(node);
  99                         hfs_bnode_free(node);
 100                 }
 101                 spin_unlock(&tree->hash_lock);
 102         } else {
 103                 nidx = page->index <<
 104                         (PAGE_CACHE_SHIFT - tree->node_size_shift);
 105                 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
 106                 spin_lock(&tree->hash_lock);
 107                 do {
 108                         node = hfs_bnode_findhash(tree, nidx++);
 109                         if (!node)
 110                                 continue;
 111                         if (atomic_read(&node->refcnt)) {
 112                                 res = 0;
 113                                 break;
 114                         }
 115                         hfs_bnode_unhash(node);
 116                         hfs_bnode_free(node);
 117                 } while (--i && nidx < tree->node_count);
 118                 spin_unlock(&tree->hash_lock);
 119         }
 120         return res ? try_to_free_buffers(page) : 0;
 121 }
 122
 123 static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb,
 124                 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
 125 {
 126         struct file *file = iocb->ki_filp;
 127         struct address_space *mapping = file->f_mapping;
 128         struct inode *inode = file_inode(file)->i_mapping->host;
 129         ssize_t ret;
 130
 131         ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
 132                                  hfsplus_get_block);
 133
 134         /*
 135          * In case of error extending write may have instantiated a few
 136          * blocks outside i_size. Trim these off again.
 137          */
 138         if (unlikely((rw & WRITE) && ret < 0)) {
 139                 loff_t isize = i_size_read(inode);
 140                 loff_t end = offset + iov_length(iov, nr_segs);
 141
 142                 if (end > isize)
 143                         hfsplus_write_failed(mapping, end);
 144         }
 145
 146         return ret;
 147 }
 148
 149 static int hfsplus_writepages(struct address_space *mapping,
 150                               struct writeback_control *wbc)
 151 {
 152         return mpage_writepages(mapping, wbc, hfsplus_get_block);
 153 }
 154
 155 const struct address_space_operations hfsplus_btree_aops = {
 156         .readpage       = hfsplus_readpage,
 157         .writepage      = hfsplus_writepage,
 158         .write_begin    = hfsplus_write_begin,
 159         .write_end      = generic_write_end,
 160         .bmap           = hfsplus_bmap,
 161         .releasepage    = hfsplus_releasepage,
 162 };
 163
 164 const struct address_space_operations hfsplus_aops = {
 165         .readpage       = hfsplus_readpage,
 166         .writepage      = hfsplus_writepage,
 167         .write_begin    = hfsplus_write_begin,
 168         .write_end      = generic_write_end,
 169         .bmap           = hfsplus_bmap,
 170         .direct_IO      = hfsplus_direct_IO,
 171         .writepages     = hfsplus_writepages,
 172 };
 173
 174 const struct dentry_operations hfsplus_dentry_operations = {
 175         .d_hash       = hfsplus_hash_dentry,
 176         .d_compare    = hfsplus_compare_dentry,
 177 };
 178
 179 static struct dentry *hfsplus_file_lookup(struct inode *dir,
 180                 struct dentry *dentry, unsigned int flags)
 181 {
 182         struct hfs_find_data fd;
 183         struct super_block *sb = dir->i_sb;
 184         struct inode *inode = NULL;
 185         struct hfsplus_inode_info *hip;
 186         int err;
 187
 188         if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
 189                 goto out;
 190
 191         inode = HFSPLUS_I(dir)->rsrc_inode;
 192         if (inode)
 193                 goto out;
 194
 195         inode = new_inode(sb);
 196         if (!inode)
 197                 return ERR_PTR(-ENOMEM);
 198
 199         hip = HFSPLUS_I(inode);
 200         inode->i_ino = dir->i_ino;
 201         INIT_LIST_HEAD(&hip->open_dir_list);
 202         mutex_init(&hip->extents_lock);
 203         hip->extent_state = 0;
 204         hip->flags = 0;
 205         hip->userflags = 0;
 206         set_bit(HFSPLUS_I_RSRC, &hip->flags);
 207
 208         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
 209         if (!err) {
 210                 err = hfsplus_find_cat(sb, dir->i_ino, &fd);
 211                 if (!err)
 212                         err = hfsplus_cat_read_inode(inode, &fd);
 213                 hfs_find_exit(&fd);
 214         }
 215         if (err) {
 216                 iput(inode);
 217                 return ERR_PTR(err);
 218         }
 219         hip->rsrc_inode = dir;
 220         HFSPLUS_I(dir)->rsrc_inode = inode;
 221         igrab(dir);
 222
 223         /*
 224          * __mark_inode_dirty expects inodes to be hashed.  Since we don't
 225          * want resource fork inodes in the regular inode space, we make them
 226          * appear hashed, but do not put on any lists.  hlist_del()
 227          * will work fine and require no locking.
 228          */
 229         hlist_add_fake(&inode->i_hash);
 230
 231         mark_inode_dirty(inode);
 232 out:
 233         d_add(dentry, inode);
 234         return NULL;
 235 }
 236
 237 static void hfsplus_get_perms(struct inode *inode,
 238                 struct hfsplus_perm *perms, int dir)
 239 {
 240         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
 241         u16 mode;
 242
 243         mode = be16_to_cpu(perms->mode);
 244
 245         i_uid_write(inode, be32_to_cpu(perms->owner));
 246         if (!i_uid_read(inode) && !mode)
 247                 inode->i_uid = sbi->uid;
 248
 249         i_gid_write(inode, be32_to_cpu(perms->group));
 250         if (!i_gid_read(inode) && !mode)
 251                 inode->i_gid = sbi->gid;
 252
 253         if (dir) {
 254                 mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(sbi->umask));
 255                 mode |= S_IFDIR;
 256         } else if (!mode)
 257                 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & ~(sbi->umask));
 258         inode->i_mode = mode;
 259
 260         HFSPLUS_I(inode)->userflags = perms->userflags;
 261         if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
 262                 inode->i_flags |= S_IMMUTABLE;
 263         else
 264                 inode->i_flags &= ~S_IMMUTABLE;
 265         if (perms->rootflags & HFSPLUS_FLG_APPEND)
 266                 inode->i_flags |= S_APPEND;
 267         else
 268                 inode->i_flags &= ~S_APPEND;
 269 }
 270
 271 static int hfsplus_file_open(struct inode *inode, struct file *file)
 272 {
 273         if (HFSPLUS_IS_RSRC(inode))
 274                 inode = HFSPLUS_I(inode)->rsrc_inode;
 275         if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
 276                 return -EOVERFLOW;
 277         atomic_inc(&HFSPLUS_I(inode)->opencnt);
 278         return 0;
 279 }
 280
 281 static int hfsplus_file_release(struct inode *inode, struct file *file)
 282 {
 283         struct super_block *sb = inode->i_sb;
 284
 285         if (HFSPLUS_IS_RSRC(inode))
 286                 inode = HFSPLUS_I(inode)->rsrc_inode;
 287         if (atomic_dec_and_test(&HFSPLUS_I(inode)->opencnt)) {
 288                 mutex_lock(&inode->i_mutex);
 289                 hfsplus_file_truncate(inode);
 290                 if (inode->i_flags & S_DEAD) {
 291                         hfsplus_delete_cat(inode->i_ino,
 292                                            HFSPLUS_SB(sb)->hidden_dir, NULL);
 293                         hfsplus_delete_inode(inode);
 294                 }
 295                 mutex_unlock(&inode->i_mutex);
 296         }
 297         return 0;
 298 }
 299
 300 static int hfsplus_setattr(struct dentry *dentry, struct iattr *attr)
 301 {
 302         struct inode *inode = dentry->d_inode;
 303         int error;
 304
 305         error = inode_change_ok(inode, attr);
 306         if (error)
 307                 return error;
 308
 309         if ((attr->ia_valid & ATTR_SIZE) &&
 310             attr->ia_size != i_size_read(inode)) {
 311                 inode_dio_wait(inode);
 312                 truncate_setsize(inode, attr->ia_size);
 313                 hfsplus_file_truncate(inode);
 314         }
 315
 316         setattr_copy(inode, attr);
 317         mark_inode_dirty(inode);
 318         return 0;
 319 }
 320
 321 int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
 322                        int datasync)
 323 {
 324         struct inode *inode = file->f_mapping->host;
 325         struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
 326         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
 327         int error = 0, error2;
 328
 329         error = filemap_write_and_wait_range(inode->i_mapping, start, end);
 330         if (error)
 331                 return error;
 332         mutex_lock(&inode->i_mutex);
 333
 334         /*
 335          * Sync inode metadata into the catalog and extent trees.
 336          */
 337         sync_inode_metadata(inode, 1);
 338
 339         /*
 340          * And explicitly write out the btrees.
 341          */
 342         if (test_and_clear_bit(HFSPLUS_I_CAT_DIRTY, &hip->flags))
 343                 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
 344
 345         if (test_and_clear_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags)) {
 346                 error2 =
 347                         filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
 348                 if (!error)
 349                         error = error2;
 350         }
 351
 352         if (test_and_clear_bit(HFSPLUS_I_ATTR_DIRTY, &hip->flags)) {
 353                 if (sbi->attr_tree) {
 354                         error2 =
 355                                 filemap_write_and_wait(
 356                                             sbi->attr_tree->inode->i_mapping);
 357                         if (!error)
 358                                 error = error2;
 359                 } else {
 360                         printk(KERN_ERR "hfs: sync non-existent attributes tree\n");
 361                 }
 362         }
 363
 364         if (test_and_clear_bit(HFSPLUS_I_ALLOC_DIRTY, &hip->flags)) {
 365                 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
 366                 if (!error)
 367                         error = error2;
 368         }
 369
 370         if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
 371                 blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
 372
 373         mutex_unlock(&inode->i_mutex);
 374
 375         return error;
 376 }
 377
 378 static const struct inode_operations hfsplus_file_inode_operations = {
 379         .lookup         = hfsplus_file_lookup,
 380         .setattr        = hfsplus_setattr,
 381         .setxattr       = generic_setxattr,
 382         .getxattr       = generic_getxattr,
 383         .listxattr      = hfsplus_listxattr,
 384         .removexattr    = hfsplus_removexattr,
 385 };
 386
 387 static const struct file_operations hfsplus_file_operations = {
 388         .llseek         = generic_file_llseek,
 389         .read           = do_sync_read,
 390         .aio_read       = generic_file_aio_read,
 391         .write          = do_sync_write,
 392         .aio_write      = generic_file_aio_write,
 393         .mmap           = generic_file_mmap,
 394         .splice_read    = generic_file_splice_read,
 395         .fsync          = hfsplus_file_fsync,
 396         .open           = hfsplus_file_open,
 397         .release        = hfsplus_file_release,
 398         .unlocked_ioctl = hfsplus_ioctl,
 399 };
 400
 401 struct inode *hfsplus_new_inode(struct super_block *sb, umode_t mode)
 402 {
 403         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 404         struct inode *inode = new_inode(sb);
 405         struct hfsplus_inode_info *hip;
 406
 407         if (!inode)
 408                 return NULL;
 409
 410         inode->i_ino = sbi->next_cnid++;
 411         inode->i_mode = mode;
 412         inode->i_uid = current_fsuid();
 413         inode->i_gid = current_fsgid();
 414         set_nlink(inode, 1);
 415         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
 416
 417         hip = HFSPLUS_I(inode);
 418         INIT_LIST_HEAD(&hip->open_dir_list);
 419         mutex_init(&hip->extents_lock);
 420         atomic_set(&hip->opencnt, 0);
 421         hip->extent_state = 0;
 422         hip->flags = 0;
 423         hip->userflags = 0;
 424         memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec));
 425         memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
 426         hip->alloc_blocks = 0;
 427         hip->first_blocks = 0;
 428         hip->cached_start = 0;
 429         hip->cached_blocks = 0;
 430         hip->phys_size = 0;
 431         hip->fs_blocks = 0;
 432         hip->rsrc_inode = NULL;
 433         if (S_ISDIR(inode->i_mode)) {
 434                 inode->i_size = 2;
 435                 sbi->folder_count++;
 436                 inode->i_op = &hfsplus_dir_inode_operations;
 437                 inode->i_fop = &hfsplus_dir_operations;
 438         } else if (S_ISREG(inode->i_mode)) {
 439                 sbi->file_count++;
 440                 inode->i_op = &hfsplus_file_inode_operations;
 441                 inode->i_fop = &hfsplus_file_operations;
 442                 inode->i_mapping->a_ops = &hfsplus_aops;
 443                 hip->clump_blocks = sbi->data_clump_blocks;
 444         } else if (S_ISLNK(inode->i_mode)) {
 445                 sbi->file_count++;
 446                 inode->i_op = &page_symlink_inode_operations;
 447                 inode->i_mapping->a_ops = &hfsplus_aops;
 448                 hip->clump_blocks = 1;
 449         } else
 450                 sbi->file_count++;
 451         insert_inode_hash(inode);
 452         mark_inode_dirty(inode);
 453         hfsplus_mark_mdb_dirty(sb);
 454
 455         return inode;
 456 }
 457
 458 void hfsplus_delete_inode(struct inode *inode)
 459 {
 460         struct super_block *sb = inode->i_sb;
 461
 462         if (S_ISDIR(inode->i_mode)) {
 463                 HFSPLUS_SB(sb)->folder_count--;
 464                 hfsplus_mark_mdb_dirty(sb);
 465                 return;
 466         }
 467         HFSPLUS_SB(sb)->file_count--;
 468         if (S_ISREG(inode->i_mode)) {
 469                 if (!inode->i_nlink) {
 470                         inode->i_size = 0;
 471                         hfsplus_file_truncate(inode);
 472                 }
 473         } else if (S_ISLNK(inode->i_mode)) {
 474                 inode->i_size = 0;
 475                 hfsplus_file_truncate(inode);
 476         }
 477         hfsplus_mark_mdb_dirty(sb);
 478 }
 479
 480 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
 481 {
 482         struct super_block *sb = inode->i_sb;
 483         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 484         struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
 485         u32 count;
 486         int i;
 487
 488         memcpy(&hip->first_extents, &fork->extents, sizeof(hfsplus_extent_rec));
 489         for (count = 0, i = 0; i < 8; i++)
 490                 count += be32_to_cpu(fork->extents[i].block_count);
 491         hip->first_blocks = count;
 492         memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
 493         hip->cached_start = 0;
 494         hip->cached_blocks = 0;
 495
 496         hip->alloc_blocks = be32_to_cpu(fork->total_blocks);
 497         hip->phys_size = inode->i_size = be64_to_cpu(fork->total_size);
 498         hip->fs_blocks =
 499                 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
 500         inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits);
 501         hip->clump_blocks =
 502                 be32_to_cpu(fork->clump_size) >> sbi->alloc_blksz_shift;
 503         if (!hip->clump_blocks) {
 504                 hip->clump_blocks = HFSPLUS_IS_RSRC(inode) ?
 505                         sbi->rsrc_clump_blocks :
 506                         sbi->data_clump_blocks;
 507         }
 508 }
 509
 510 void hfsplus_inode_write_fork(struct inode *inode,
 511                 struct hfsplus_fork_raw *fork)
 512 {
 513         memcpy(&fork->extents, &HFSPLUS_I(inode)->first_extents,
 514                sizeof(hfsplus_extent_rec));
 515         fork->total_size = cpu_to_be64(inode->i_size);
 516         fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode)->alloc_blocks);
 517 }
 518
 519 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
 520 {
 521         hfsplus_cat_entry entry;
 522         int res = 0;
 523         u16 type;
 524
 525         type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
 526
 527         HFSPLUS_I(inode)->linkid = 0;
 528         if (type == HFSPLUS_FOLDER) {
 529                 struct hfsplus_cat_folder *folder = &entry.folder;
 530
 531                 if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
 532                         /* panic? */;
 533                 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
 534                                         sizeof(struct hfsplus_cat_folder));
 535                 hfsplus_get_perms(inode, &folder->permissions, 1);
 536                 set_nlink(inode, 1);
 537                 inode->i_size = 2 + be32_to_cpu(folder->valence);
 538                 inode->i_atime = hfsp_mt2ut(folder->access_date);
 539                 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
 540                 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
 541                 HFSPLUS_I(inode)->create_date = folder->create_date;
 542                 HFSPLUS_I(inode)->fs_blocks = 0;
 543                 inode->i_op = &hfsplus_dir_inode_operations;
 544                 inode->i_fop = &hfsplus_dir_operations;
 545         } else if (type == HFSPLUS_FILE) {
 546                 struct hfsplus_cat_file *file = &entry.file;
 547
 548                 if (fd->entrylength < sizeof(struct hfsplus_cat_file))
 549                         /* panic? */;
 550                 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
 551                                         sizeof(struct hfsplus_cat_file));
 552
 553                 hfsplus_inode_read_fork(inode, HFSPLUS_IS_RSRC(inode) ?
 554                                         &file->rsrc_fork : &file->data_fork);
 555                 hfsplus_get_perms(inode, &file->permissions, 0);
 556                 set_nlink(inode, 1);
 557                 if (S_ISREG(inode->i_mode)) {
 558                         if (file->permissions.dev)
 559                                 set_nlink(inode,
 560                                           be32_to_cpu(file->permissions.dev));
 561                         inode->i_op = &hfsplus_file_inode_operations;
 562                         inode->i_fop = &hfsplus_file_operations;
 563                         inode->i_mapping->a_ops = &hfsplus_aops;
 564                 } else if (S_ISLNK(inode->i_mode)) {
 565                         inode->i_op = &page_symlink_inode_operations;
 566                         inode->i_mapping->a_ops = &hfsplus_aops;
 567                 } else {
 568                         init_special_inode(inode, inode->i_mode,
 569                                            be32_to_cpu(file->permissions.dev));
 570                 }
 571                 inode->i_atime = hfsp_mt2ut(file->access_date);
 572                 inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
 573                 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
 574                 HFSPLUS_I(inode)->create_date = file->create_date;
 575         } else {
 576                 printk(KERN_ERR "hfs: bad catalog entry used to create inode\n");
 577                 res = -EIO;
 578         }
 579         return res;
 580 }
 581
 582 int hfsplus_cat_write_inode(struct inode *inode)
 583 {
 584         struct inode *main_inode = inode;
 585         struct hfs_find_data fd;
 586         hfsplus_cat_entry entry;
 587
 588         if (HFSPLUS_IS_RSRC(inode))
 589                 main_inode = HFSPLUS_I(inode)->rsrc_inode;
 590
 591         if (!main_inode->i_nlink)
 592                 return 0;
 593
 594         if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb)->cat_tree, &fd))
 595                 /* panic? */
 596                 return -EIO;
 597
 598         if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
 599                 /* panic? */
 600                 goto out;
 601
 602         if (S_ISDIR(main_inode->i_mode)) {
 603                 struct hfsplus_cat_folder *folder = &entry.folder;
 604
 605                 if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
 606                         /* panic? */;
 607                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 608                                         sizeof(struct hfsplus_cat_folder));
 609                 /* simple node checks? */
 610                 hfsplus_cat_set_perms(inode, &folder->permissions);
 611                 folder->access_date = hfsp_ut2mt(inode->i_atime);
 612                 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
 613                 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
 614                 folder->valence = cpu_to_be32(inode->i_size - 2);
 615                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
 616                                          sizeof(struct hfsplus_cat_folder));
 617         } else if (HFSPLUS_IS_RSRC(inode)) {
 618                 struct hfsplus_cat_file *file = &entry.file;
 619                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 620                                sizeof(struct hfsplus_cat_file));
 621                 hfsplus_inode_write_fork(inode, &file->rsrc_fork);
 622                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
 623                                 sizeof(struct hfsplus_cat_file));
 624         } else {
 625                 struct hfsplus_cat_file *file = &entry.file;
 626
 627                 if (fd.entrylength < sizeof(struct hfsplus_cat_file))
 628                         /* panic? */;
 629                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 630                                         sizeof(struct hfsplus_cat_file));
 631                 hfsplus_inode_write_fork(inode, &file->data_fork);
 632                 hfsplus_cat_set_perms(inode, &file->permissions);
 633                 if (HFSPLUS_FLG_IMMUTABLE &
 634                                 (file->permissions.rootflags |
 635                                         file->permissions.userflags))
 636                         file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
 637                 else
 638                         file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
 639                 file->access_date = hfsp_ut2mt(inode->i_atime);
 640                 file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
 641                 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
 642                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
 643                                          sizeof(struct hfsplus_cat_file));
 644         }
 645
 646         set_bit(HFSPLUS_I_CAT_DIRTY, &HFSPLUS_I(inode)->flags);
 647 out:
 648         hfs_find_exit(&fd);
 649         return 0;
 650 }