linux/fs/ntfs/usnjrnl.c
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   1/*
   2 * usnjrnl.h - NTFS kernel transaction log ($UsnJrnl) handling.  Part of the
   3 *             Linux-NTFS project.
   4 *
   5 * Copyright (c) 2005 Anton Altaparmakov
   6 *
   7 * This program/include file is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License as published
   9 * by the Free Software Foundation; either version 2 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program/include file is distributed in the hope that it will be
  13 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program (in the main directory of the Linux-NTFS
  19 * distribution in the file COPYING); if not, write to the Free Software
  20 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 */
  22
  23#ifdef NTFS_RW
  24
  25#include <linux/fs.h>
  26#include <linux/highmem.h>
  27#include <linux/mm.h>
  28
  29#include "aops.h"
  30#include "debug.h"
  31#include "endian.h"
  32#include "time.h"
  33#include "types.h"
  34#include "usnjrnl.h"
  35#include "volume.h"
  36
  37/**
  38 * ntfs_stamp_usnjrnl - stamp the transaction log ($UsnJrnl) on an ntfs volume
  39 * @vol:        ntfs volume on which to stamp the transaction log
  40 *
  41 * Stamp the transaction log ($UsnJrnl) on the ntfs volume @vol and return
  42 * 'true' on success and 'false' on error.
  43 *
  44 * This function assumes that the transaction log has already been loaded and
  45 * consistency checked by a call to fs/ntfs/super.c::load_and_init_usnjrnl().
  46 */
  47bool ntfs_stamp_usnjrnl(ntfs_volume *vol)
  48{
  49        ntfs_debug("Entering.");
  50        if (likely(!NVolUsnJrnlStamped(vol))) {
  51                sle64 stamp;
  52                struct page *page;
  53                USN_HEADER *uh;
  54
  55                page = ntfs_map_page(vol->usnjrnl_max_ino->i_mapping, 0);
  56                if (IS_ERR(page)) {
  57                        ntfs_error(vol->sb, "Failed to read from "
  58                                        "$UsnJrnl/$DATA/$Max attribute.");
  59                        return false;
  60                }
  61                uh = (USN_HEADER*)page_address(page);
  62                stamp = get_current_ntfs_time();
  63                ntfs_debug("Stamping transaction log ($UsnJrnl): old "
  64                                "journal_id 0x%llx, old lowest_valid_usn "
  65                                "0x%llx, new journal_id 0x%llx, new "
  66                                "lowest_valid_usn 0x%llx.",
  67                                (long long)sle64_to_cpu(uh->journal_id),
  68                                (long long)sle64_to_cpu(uh->lowest_valid_usn),
  69                                (long long)sle64_to_cpu(stamp),
  70                                i_size_read(vol->usnjrnl_j_ino));
  71                uh->lowest_valid_usn =
  72                                cpu_to_sle64(i_size_read(vol->usnjrnl_j_ino));
  73                uh->journal_id = stamp;
  74                flush_dcache_page(page);
  75                set_page_dirty(page);
  76                ntfs_unmap_page(page);
  77                /* Set the flag so we do not have to do it again on remount. */
  78                NVolSetUsnJrnlStamped(vol);
  79        }
  80        ntfs_debug("Done.");
  81        return true;
  82}
  83
  84#endif /* NTFS_RW */
  85
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