Root/fs/ntfs/usnjrnl.c

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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