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 #include <linux/aio.h>
  18
  19 #include "hfsplus_fs.h"
  20 #include "hfsplus_raw.h"
  21 #include "xattr.h"
  22
  23 static int hfsplus_readpage(struct file *file, struct page *page)
  24 {
  25         return block_read_full_page(page, hfsplus_get_block);
  26 }
  27
  28 static int hfsplus_writepage(struct page *page, struct writeback_control *wbc)
  29 {
  30         return block_write_full_page(page, hfsplus_get_block, wbc);
  31 }
  32
  33 static void hfsplus_write_failed(struct address_space *mapping, loff_t to)
  34 {
  35         struct inode *inode = mapping->host;
  36
  37         if (to > inode->i_size) {
  38                 truncate_pagecache(inode, to, inode->i_size);
  39                 hfsplus_file_truncate(inode);
  40         }
  41 }
  42
  43 static int hfsplus_write_begin(struct file *file, struct address_space *mapping,
  44                         loff_t pos, unsigned len, unsigned flags,
  45                         struct page **pagep, void **fsdata)
  46 {
  47         int ret;
  48
  49         *pagep = NULL;
  50         ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
  51                                 hfsplus_get_block,
  52                                 &HFSPLUS_I(mapping->host)->phys_size);
  53         if (unlikely(ret))
  54                 hfsplus_write_failed(mapping, pos + len);
  55
  56         return ret;
  57 }
  58
  59 static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
  60 {
  61         return generic_block_bmap(mapping, block, hfsplus_get_block);
  62 }
  63
  64 static int hfsplus_releasepage(struct page *page, gfp_t mask)
  65 {
  66         struct inode *inode = page->mapping->host;
  67         struct super_block *sb = inode->i_sb;
  68         struct hfs_btree *tree;
  69         struct hfs_bnode *node;
  70         u32 nidx;
  71         int i, res = 1;
  72
  73         switch (inode->i_ino) {
  74         case HFSPLUS_EXT_CNID:
  75                 tree = HFSPLUS_SB(sb)->ext_tree;
  76                 break;
  77         case HFSPLUS_CAT_CNID:
  78                 tree = HFSPLUS_SB(sb)->cat_tree;
  79                 break;
  80         case HFSPLUS_ATTR_CNID:
  81                 tree = HFSPLUS_SB(sb)->attr_tree;
  82                 break;
  83         default:
  84                 BUG();
  85                 return 0;
  86         }
  87         if (!tree)
  88                 return 0;
  89         if (tree->node_size >= PAGE_CACHE_SIZE) {
  90                 nidx = page->index >>
  91                         (tree->node_size_shift - PAGE_CACHE_SHIFT);
  92                 spin_lock(&tree->hash_lock);
  93                 node = hfs_bnode_findhash(tree, nidx);
  94                 if (!node)
  95                         ;
  96                 else if (atomic_read(&node->refcnt))
  97                         res = 0;
  98                 if (res && node) {
  99                         hfs_bnode_unhash(node);
 100                         hfs_bnode_free(node);
 101                 }
 102                 spin_unlock(&tree->hash_lock);
 103         } else {
 104                 nidx = page->index <<
 105                         (PAGE_CACHE_SHIFT - tree->node_size_shift);
 106                 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
 107                 spin_lock(&tree->hash_lock);
 108                 do {
 109                         node = hfs_bnode_findhash(tree, nidx++);
 110                         if (!node)
 111                                 continue;
 112                         if (atomic_read(&node->refcnt)) {
 113                                 res = 0;
 114                                 break;
 115                         }
 116                         hfs_bnode_unhash(node);
 117                         hfs_bnode_free(node);
 118                 } while (--i && nidx < tree->node_count);
 119                 spin_unlock(&tree->hash_lock);
 120         }
 121         return res ? try_to_free_buffers(page) : 0;
 122 }
 123
 124 static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb,
 125                 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
 126 {
 127         struct file *file = iocb->ki_filp;
 128         struct address_space *mapping = file->f_mapping;
 129         struct inode *inode = file_inode(file)->i_mapping->host;
 130         ssize_t ret;
 131
 132         ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
 133                                  hfsplus_get_block);
 134
 135         /*
 136          * In case of error extending write may have instantiated a few
 137          * blocks outside i_size. Trim these off again.
 138          */
 139         if (unlikely((rw & WRITE) && ret < 0)) {
 140                 loff_t isize = i_size_read(inode);
 141                 loff_t end = offset + iov_length(iov, nr_segs);
 142
 143                 if (end > isize)
 144                         hfsplus_write_failed(mapping, end);
 145         }
 146
 147         return ret;
 148 }
 149
 150 static int hfsplus_writepages(struct address_space *mapping,
 151                               struct writeback_control *wbc)
 152 {
 153         return mpage_writepages(mapping, wbc, hfsplus_get_block);
 154 }
 155
 156 const struct address_space_operations hfsplus_btree_aops = {
 157         .readpage       = hfsplus_readpage,
 158         .writepage      = hfsplus_writepage,
 159         .write_begin    = hfsplus_write_begin,
 160         .write_end      = generic_write_end,
 161         .bmap           = hfsplus_bmap,
 162         .releasepage    = hfsplus_releasepage,
 163 };
 164
 165 const struct address_space_operations hfsplus_aops = {
 166         .readpage       = hfsplus_readpage,
 167         .writepage      = hfsplus_writepage,
 168         .write_begin    = hfsplus_write_begin,
 169         .write_end      = generic_write_end,
 170         .bmap           = hfsplus_bmap,
 171         .direct_IO      = hfsplus_direct_IO,
 172         .writepages     = hfsplus_writepages,
 173 };
 174
 175 const struct dentry_operations hfsplus_dentry_operations = {
 176         .d_hash       = hfsplus_hash_dentry,
 177         .d_compare    = hfsplus_compare_dentry,
 178 };
 179
 180 static struct dentry *hfsplus_file_lookup(struct inode *dir,
 181                 struct dentry *dentry, unsigned int flags)
 182 {
 183         struct hfs_find_data fd;
 184         struct super_block *sb = dir->i_sb;
 185         struct inode *inode = NULL;
 186         struct hfsplus_inode_info *hip;
 187         int err;
 188
 189         if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
 190                 goto out;
 191
 192         inode = HFSPLUS_I(dir)->rsrc_inode;
 193         if (inode)
 194                 goto out;
 195
 196         inode = new_inode(sb);
 197         if (!inode)
 198                 return ERR_PTR(-ENOMEM);
 199
 200         hip = HFSPLUS_I(inode);
 201         inode->i_ino = dir->i_ino;
 202         INIT_LIST_HEAD(&hip->open_dir_list);
 203         mutex_init(&hip->extents_lock);
 204         hip->extent_state = 0;
 205         hip->flags = 0;
 206         hip->userflags = 0;
 207         set_bit(HFSPLUS_I_RSRC, &hip->flags);
 208
 209         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
 210         if (!err) {
 211                 err = hfsplus_find_cat(sb, dir->i_ino, &fd);
 212                 if (!err)
 213                         err = hfsplus_cat_read_inode(inode, &fd);
 214                 hfs_find_exit(&fd);
 215         }
 216         if (err) {
 217                 iput(inode);
 218                 return ERR_PTR(err);
 219         }
 220         hip->rsrc_inode = dir;
 221         HFSPLUS_I(dir)->rsrc_inode = inode;
 222         igrab(dir);
 223
 224         /*
 225          * __mark_inode_dirty expects inodes to be hashed.  Since we don't
 226          * want resource fork inodes in the regular inode space, we make them
 227          * appear hashed, but do not put on any lists.  hlist_del()
 228          * will work fine and require no locking.
 229          */
 230         hlist_add_fake(&inode->i_hash);
 231
 232         mark_inode_dirty(inode);
 233 out:
 234         d_add(dentry, inode);
 235         return NULL;
 236 }
 237
 238 static void hfsplus_get_perms(struct inode *inode,
 239                 struct hfsplus_perm *perms, int dir)
 240 {
 241         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
 242         u16 mode;
 243
 244         mode = be16_to_cpu(perms->mode);
 245
 246         i_uid_write(inode, be32_to_cpu(perms->owner));
 247         if (!i_uid_read(inode) && !mode)
 248                 inode->i_uid = sbi->uid;
 249
 250         i_gid_write(inode, be32_to_cpu(perms->group));
 251         if (!i_gid_read(inode) && !mode)
 252                 inode->i_gid = sbi->gid;
 253
 254         if (dir) {
 255                 mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(sbi->umask));
 256                 mode |= S_IFDIR;
 257         } else if (!mode)
 258                 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & ~(sbi->umask));
 259         inode->i_mode = mode;
 260
 261         HFSPLUS_I(inode)->userflags = perms->userflags;
 262         if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
 263                 inode->i_flags |= S_IMMUTABLE;
 264         else
 265                 inode->i_flags &= ~S_IMMUTABLE;
 266         if (perms->rootflags & HFSPLUS_FLG_APPEND)
 267                 inode->i_flags |= S_APPEND;
 268         else
 269                 inode->i_flags &= ~S_APPEND;
 270 }
 271
 272 static int hfsplus_file_open(struct inode *inode, struct file *file)
 273 {
 274         if (HFSPLUS_IS_RSRC(inode))
 275                 inode = HFSPLUS_I(inode)->rsrc_inode;
 276         if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
 277                 return -EOVERFLOW;
 278         atomic_inc(&HFSPLUS_I(inode)->opencnt);
 279         return 0;
 280 }
 281
 282 static int hfsplus_file_release(struct inode *inode, struct file *file)
 283 {
 284         struct super_block *sb = inode->i_sb;
 285
 286         if (HFSPLUS_IS_RSRC(inode))
 287                 inode = HFSPLUS_I(inode)->rsrc_inode;
 288         if (atomic_dec_and_test(&HFSPLUS_I(inode)->opencnt)) {
 289                 mutex_lock(&inode->i_mutex);
 290                 hfsplus_file_truncate(inode);
 291                 if (inode->i_flags & S_DEAD) {
 292                         hfsplus_delete_cat(inode->i_ino,
 293                                            HFSPLUS_SB(sb)->hidden_dir, NULL);
 294                         hfsplus_delete_inode(inode);
 295                 }
 296                 mutex_unlock(&inode->i_mutex);
 297         }
 298         return 0;
 299 }
 300
 301 static int hfsplus_setattr(struct dentry *dentry, struct iattr *attr)
 302 {
 303         struct inode *inode = dentry->d_inode;
 304         int error;
 305
 306         error = inode_change_ok(inode, attr);
 307         if (error)
 308                 return error;
 309
 310         if ((attr->ia_valid & ATTR_SIZE) &&
 311             attr->ia_size != i_size_read(inode)) {
 312                 inode_dio_wait(inode);
 313                 truncate_setsize(inode, attr->ia_size);
 314                 hfsplus_file_truncate(inode);
 315         }
 316
 317         setattr_copy(inode, attr);
 318         mark_inode_dirty(inode);
 319         return 0;
 320 }
 321
 322 int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
 323                        int datasync)
 324 {
 325         struct inode *inode = file->f_mapping->host;
 326         struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
 327         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
 328         int error = 0, error2;
 329
 330         error = filemap_write_and_wait_range(inode->i_mapping, start, end);
 331         if (error)
 332                 return error;
 333         mutex_lock(&inode->i_mutex);
 334
 335         /*
 336          * Sync inode metadata into the catalog and extent trees.
 337          */
 338         sync_inode_metadata(inode, 1);
 339
 340         /*
 341          * And explicitly write out the btrees.
 342          */
 343         if (test_and_clear_bit(HFSPLUS_I_CAT_DIRTY, &hip->flags))
 344                 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
 345
 346         if (test_and_clear_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags)) {
 347                 error2 =
 348                         filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
 349                 if (!error)
 350                         error = error2;
 351         }
 352
 353         if (test_and_clear_bit(HFSPLUS_I_ATTR_DIRTY, &hip->flags)) {
 354                 if (sbi->attr_tree) {
 355                         error2 =
 356                                 filemap_write_and_wait(
 357                                             sbi->attr_tree->inode->i_mapping);
 358                         if (!error)
 359                                 error = error2;
 360                 } else {
 361                         pr_err("sync non-existent attributes tree\n");
 362                 }
 363         }
 364
 365         if (test_and_clear_bit(HFSPLUS_I_ALLOC_DIRTY, &hip->flags)) {
 366                 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
 367                 if (!error)
 368                         error = error2;
 369         }
 370
 371         if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
 372                 blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
 373
 374         mutex_unlock(&inode->i_mutex);
 375
 376         return error;
 377 }
 378
 379 static const struct inode_operations hfsplus_file_inode_operations = {
 380         .lookup         = hfsplus_file_lookup,
 381         .setattr        = hfsplus_setattr,
 382         .setxattr       = generic_setxattr,
 383         .getxattr       = generic_getxattr,
 384         .listxattr      = hfsplus_listxattr,
 385         .removexattr    = hfsplus_removexattr,
 386 };
 387
 388 static const struct file_operations hfsplus_file_operations = {
 389         .llseek         = generic_file_llseek,
 390         .read           = do_sync_read,
 391         .aio_read       = generic_file_aio_read,
 392         .write          = do_sync_write,
 393         .aio_write      = generic_file_aio_write,
 394         .mmap           = generic_file_mmap,
 395         .splice_read    = generic_file_splice_read,
 396         .fsync          = hfsplus_file_fsync,
 397         .open           = hfsplus_file_open,
 398         .release        = hfsplus_file_release,
 399         .unlocked_ioctl = hfsplus_ioctl,
 400 };
 401
 402 struct inode *hfsplus_new_inode(struct super_block *sb, umode_t mode)
 403 {
 404         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 405         struct inode *inode = new_inode(sb);
 406         struct hfsplus_inode_info *hip;
 407
 408         if (!inode)
 409                 return NULL;
 410
 411         inode->i_ino = sbi->next_cnid++;
 412         inode->i_mode = mode;
 413         inode->i_uid = current_fsuid();
 414         inode->i_gid = current_fsgid();
 415         set_nlink(inode, 1);
 416         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
 417
 418         hip = HFSPLUS_I(inode);
 419         INIT_LIST_HEAD(&hip->open_dir_list);
 420         mutex_init(&hip->extents_lock);
 421         atomic_set(&hip->opencnt, 0);
 422         hip->extent_state = 0;
 423         hip->flags = 0;
 424         hip->userflags = 0;
 425         memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec));
 426         memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
 427         hip->alloc_blocks = 0;
 428         hip->first_blocks = 0;
 429         hip->cached_start = 0;
 430         hip->cached_blocks = 0;
 431         hip->phys_size = 0;
 432         hip->fs_blocks = 0;
 433         hip->rsrc_inode = NULL;
 434         if (S_ISDIR(inode->i_mode)) {
 435                 inode->i_size = 2;
 436                 sbi->folder_count++;
 437                 inode->i_op = &hfsplus_dir_inode_operations;
 438                 inode->i_fop = &hfsplus_dir_operations;
 439         } else if (S_ISREG(inode->i_mode)) {
 440                 sbi->file_count++;
 441                 inode->i_op = &hfsplus_file_inode_operations;
 442                 inode->i_fop = &hfsplus_file_operations;
 443                 inode->i_mapping->a_ops = &hfsplus_aops;
 444                 hip->clump_blocks = sbi->data_clump_blocks;
 445         } else if (S_ISLNK(inode->i_mode)) {
 446                 sbi->file_count++;
 447                 inode->i_op = &page_symlink_inode_operations;
 448                 inode->i_mapping->a_ops = &hfsplus_aops;
 449                 hip->clump_blocks = 1;
 450         } else
 451                 sbi->file_count++;
 452         insert_inode_hash(inode);
 453         mark_inode_dirty(inode);
 454         hfsplus_mark_mdb_dirty(sb);
 455
 456         return inode;
 457 }
 458
 459 void hfsplus_delete_inode(struct inode *inode)
 460 {
 461         struct super_block *sb = inode->i_sb;
 462
 463         if (S_ISDIR(inode->i_mode)) {
 464                 HFSPLUS_SB(sb)->folder_count--;
 465                 hfsplus_mark_mdb_dirty(sb);
 466                 return;
 467         }
 468         HFSPLUS_SB(sb)->file_count--;
 469         if (S_ISREG(inode->i_mode)) {
 470                 if (!inode->i_nlink) {
 471                         inode->i_size = 0;
 472                         hfsplus_file_truncate(inode);
 473                 }
 474         } else if (S_ISLNK(inode->i_mode)) {
 475                 inode->i_size = 0;
 476                 hfsplus_file_truncate(inode);
 477         }
 478         hfsplus_mark_mdb_dirty(sb);
 479 }
 480
 481 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
 482 {
 483         struct super_block *sb = inode->i_sb;
 484         struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 485         struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
 486         u32 count;
 487         int i;
 488
 489         memcpy(&hip->first_extents, &fork->extents, sizeof(hfsplus_extent_rec));
 490         for (count = 0, i = 0; i < 8; i++)
 491                 count += be32_to_cpu(fork->extents[i].block_count);
 492         hip->first_blocks = count;
 493         memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
 494         hip->cached_start = 0;
 495         hip->cached_blocks = 0;
 496
 497         hip->alloc_blocks = be32_to_cpu(fork->total_blocks);
 498         hip->phys_size = inode->i_size = be64_to_cpu(fork->total_size);
 499         hip->fs_blocks =
 500                 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
 501         inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits);
 502         hip->clump_blocks =
 503                 be32_to_cpu(fork->clump_size) >> sbi->alloc_blksz_shift;
 504         if (!hip->clump_blocks) {
 505                 hip->clump_blocks = HFSPLUS_IS_RSRC(inode) ?
 506                         sbi->rsrc_clump_blocks :
 507                         sbi->data_clump_blocks;
 508         }
 509 }
 510
 511 void hfsplus_inode_write_fork(struct inode *inode,
 512                 struct hfsplus_fork_raw *fork)
 513 {
 514         memcpy(&fork->extents, &HFSPLUS_I(inode)->first_extents,
 515                sizeof(hfsplus_extent_rec));
 516         fork->total_size = cpu_to_be64(inode->i_size);
 517         fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode)->alloc_blocks);
 518 }
 519
 520 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
 521 {
 522         hfsplus_cat_entry entry;
 523         int res = 0;
 524         u16 type;
 525
 526         type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
 527
 528         HFSPLUS_I(inode)->linkid = 0;
 529         if (type == HFSPLUS_FOLDER) {
 530                 struct hfsplus_cat_folder *folder = &entry.folder;
 531
 532                 if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
 533                         /* panic? */;
 534                 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
 535                                         sizeof(struct hfsplus_cat_folder));
 536                 hfsplus_get_perms(inode, &folder->permissions, 1);
 537                 set_nlink(inode, 1);
 538                 inode->i_size = 2 + be32_to_cpu(folder->valence);
 539                 inode->i_atime = hfsp_mt2ut(folder->access_date);
 540                 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
 541                 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
 542                 HFSPLUS_I(inode)->create_date = folder->create_date;
 543                 HFSPLUS_I(inode)->fs_blocks = 0;
 544                 inode->i_op = &hfsplus_dir_inode_operations;
 545                 inode->i_fop = &hfsplus_dir_operations;
 546         } else if (type == HFSPLUS_FILE) {
 547                 struct hfsplus_cat_file *file = &entry.file;
 548
 549                 if (fd->entrylength < sizeof(struct hfsplus_cat_file))
 550                         /* panic? */;
 551                 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
 552                                         sizeof(struct hfsplus_cat_file));
 553
 554                 hfsplus_inode_read_fork(inode, HFSPLUS_IS_RSRC(inode) ?
 555                                         &file->rsrc_fork : &file->data_fork);
 556                 hfsplus_get_perms(inode, &file->permissions, 0);
 557                 set_nlink(inode, 1);
 558                 if (S_ISREG(inode->i_mode)) {
 559                         if (file->permissions.dev)
 560                                 set_nlink(inode,
 561                                           be32_to_cpu(file->permissions.dev));
 562                         inode->i_op = &hfsplus_file_inode_operations;
 563                         inode->i_fop = &hfsplus_file_operations;
 564                         inode->i_mapping->a_ops = &hfsplus_aops;
 565                 } else if (S_ISLNK(inode->i_mode)) {
 566                         inode->i_op = &page_symlink_inode_operations;
 567                         inode->i_mapping->a_ops = &hfsplus_aops;
 568                 } else {
 569                         init_special_inode(inode, inode->i_mode,
 570                                            be32_to_cpu(file->permissions.dev));
 571                 }
 572                 inode->i_atime = hfsp_mt2ut(file->access_date);
 573                 inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
 574                 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
 575                 HFSPLUS_I(inode)->create_date = file->create_date;
 576         } else {
 577                 pr_err("bad catalog entry used to create inode\n");
 578                 res = -EIO;
 579         }
 580         return res;
 581 }
 582
 583 int hfsplus_cat_write_inode(struct inode *inode)
 584 {
 585         struct inode *main_inode = inode;
 586         struct hfs_find_data fd;
 587         hfsplus_cat_entry entry;
 588
 589         if (HFSPLUS_IS_RSRC(inode))
 590                 main_inode = HFSPLUS_I(inode)->rsrc_inode;
 591
 592         if (!main_inode->i_nlink)
 593                 return 0;
 594
 595         if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb)->cat_tree, &fd))
 596                 /* panic? */
 597                 return -EIO;
 598
 599         if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
 600                 /* panic? */
 601                 goto out;
 602
 603         if (S_ISDIR(main_inode->i_mode)) {
 604                 struct hfsplus_cat_folder *folder = &entry.folder;
 605
 606                 if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
 607                         /* panic? */;
 608                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 609                                         sizeof(struct hfsplus_cat_folder));
 610                 /* simple node checks? */
 611                 hfsplus_cat_set_perms(inode, &folder->permissions);
 612                 folder->access_date = hfsp_ut2mt(inode->i_atime);
 613                 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
 614                 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
 615                 folder->valence = cpu_to_be32(inode->i_size - 2);
 616                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
 617                                          sizeof(struct hfsplus_cat_folder));
 618         } else if (HFSPLUS_IS_RSRC(inode)) {
 619                 struct hfsplus_cat_file *file = &entry.file;
 620                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 621                                sizeof(struct hfsplus_cat_file));
 622                 hfsplus_inode_write_fork(inode, &file->rsrc_fork);
 623                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
 624                                 sizeof(struct hfsplus_cat_file));
 625         } else {
 626                 struct hfsplus_cat_file *file = &entry.file;
 627
 628                 if (fd.entrylength < sizeof(struct hfsplus_cat_file))
 629                         /* panic? */;
 630                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
 631                                         sizeof(struct hfsplus_cat_file));
 632                 hfsplus_inode_write_fork(inode, &file->data_fork);
 633                 hfsplus_cat_set_perms(inode, &file->permissions);
 634                 if (HFSPLUS_FLG_IMMUTABLE &
 635                                 (file->permissions.rootflags |
 636                                         file->permissions.userflags))
 637                         file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
 638                 else
 639                         file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
 640                 file->access_date = hfsp_ut2mt(inode->i_atime);
 641                 file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
 642                 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
 643                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
 644                                          sizeof(struct hfsplus_cat_file));
 645         }
 646
 647         set_bit(HFSPLUS_I_CAT_DIRTY, &HFSPLUS_I(inode)->flags);
 648 out:
 649         hfs_find_exit(&fd);
 650         return 0;
 651 }