1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * usnjrnl.h - NTFS kernel transaction log ($UsnJrnl) handling. Part of the
4 * Linux-NTFS project.
5 *
6 * Copyright (c) 2005 Anton Altaparmakov
7 */
8
9#ifdef NTFS_RW
10
11#include <linux/fs.h>
12#include <linux/highmem.h>
13#include <linux/mm.h>
14
15#include "aops.h"
16#include "debug.h"
17#include "endian.h"
18#include "time.h"
19#include "types.h"
20#include "usnjrnl.h"
21#include "volume.h"
22
23/**
24 * ntfs_stamp_usnjrnl - stamp the transaction log ($UsnJrnl) on an ntfs volume
25 * @vol: ntfs volume on which to stamp the transaction log
26 *
27 * Stamp the transaction log ($UsnJrnl) on the ntfs volume @vol and return
28 * 'true' on success and 'false' on error.
29 *
30 * This function assumes that the transaction log has already been loaded and
31 * consistency checked by a call to fs/ntfs/super.c::load_and_init_usnjrnl().
32 */
33bool ntfs_stamp_usnjrnl(ntfs_volume *vol)
34{
35 ntfs_debug("Entering.");
36 if (likely(!NVolUsnJrnlStamped(vol))) {
37 sle64 stamp;
38 struct page *page;
39 USN_HEADER *uh;
40
41 page = ntfs_map_page(mapping: vol->usnjrnl_max_ino->i_mapping, index: 0);
42 if (IS_ERR(ptr: page)) {
43 ntfs_error(vol->sb, "Failed to read from "
44 "$UsnJrnl/$DATA/$Max attribute.");
45 return false;
46 }
47 uh = (USN_HEADER*)page_address(page);
48 stamp = get_current_ntfs_time();
49 ntfs_debug("Stamping transaction log ($UsnJrnl): old "
50 "journal_id 0x%llx, old lowest_valid_usn "
51 "0x%llx, new journal_id 0x%llx, new "
52 "lowest_valid_usn 0x%llx.",
53 (long long)sle64_to_cpu(uh->journal_id),
54 (long long)sle64_to_cpu(uh->lowest_valid_usn),
55 (long long)sle64_to_cpu(stamp),
56 i_size_read(vol->usnjrnl_j_ino));
57 uh->lowest_valid_usn =
58 cpu_to_sle64(x: i_size_read(inode: vol->usnjrnl_j_ino));
59 uh->journal_id = stamp;
60 flush_dcache_page(page);
61 set_page_dirty(page);
62 ntfs_unmap_page(page);
63 /* Set the flag so we do not have to do it again on remount. */
64 NVolSetUsnJrnlStamped(vol);
65 }
66 ntfs_debug("Done.");
67 return true;
68}
69
70#endif /* NTFS_RW */
71

source code of linux/fs/ntfs/usnjrnl.c