// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* usnjrnl.h - NTFS kernel transaction log ($UsnJrnl) handling. Part of the
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* Linux-NTFS project.
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*
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* Copyright (c) 2005 Anton Altaparmakov
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*/
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#ifdef NTFS_RW
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#include <linux/fs.h>
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#include <linux/highmem.h>
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#include <linux/mm.h>
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#include "aops.h"
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#include "debug.h"
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#include "endian.h"
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#include "time.h"
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#include "types.h"
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#include "usnjrnl.h"
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#include "volume.h"
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/**
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* ntfs_stamp_usnjrnl - stamp the transaction log ($UsnJrnl) on an ntfs volume
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* @vol: ntfs volume on which to stamp the transaction log
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*
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* Stamp the transaction log ($UsnJrnl) on the ntfs volume @vol and return
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* 'true' on success and 'false' on error.
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*
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* This function assumes that the transaction log has already been loaded and
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* consistency checked by a call to fs/ntfs/super.c::load_and_init_usnjrnl().
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*/
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bool ntfs_stamp_usnjrnl(ntfs_volume *vol)
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{
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ntfs_debug("Entering.");
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if (likely(!NVolUsnJrnlStamped(vol))) {
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sle64 stamp;
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struct page *page;
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USN_HEADER *uh;
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page = ntfs_map_page(vol->usnjrnl_max_ino->i_mapping, 0);
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if (IS_ERR(page)) {
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ntfs_error(vol->sb, "Failed to read from "
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"$UsnJrnl/$DATA/$Max attribute.");
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return false;
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}
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uh = (USN_HEADER*)page_address(page);
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stamp = get_current_ntfs_time();
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ntfs_debug("Stamping transaction log ($UsnJrnl): old "
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"journal_id 0x%llx, old lowest_valid_usn "
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"0x%llx, new journal_id 0x%llx, new "
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"lowest_valid_usn 0x%llx.",
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(long long)sle64_to_cpu(uh->journal_id),
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(long long)sle64_to_cpu(uh->lowest_valid_usn),
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(long long)sle64_to_cpu(stamp),
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i_size_read(vol->usnjrnl_j_ino));
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uh->lowest_valid_usn =
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cpu_to_sle64(i_size_read(vol->usnjrnl_j_ino));
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uh->journal_id = stamp;
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flush_dcache_page(page);
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set_page_dirty(page);
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ntfs_unmap_page(page);
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/* Set the flag so we do not have to do it again on remount. */
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NVolSetUsnJrnlStamped(vol);
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}
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ntfs_debug("Done.");
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return true;
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}
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#endif /* NTFS_RW */
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