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Linux/fs/ntfs/usnjrnl.c

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  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 ($UsnJrnl) on the ntfs volume @vol and return
 28  * 'true' on success and 'false' on error.
 29  *
 30  * This function assumes that the transaction log has already been loaded and
 31  * consistency checked by a call to fs/ntfs/super.c::load_and_init_usnjrnl().
 32  */
 33 bool ntfs_stamp_usnjrnl(ntfs_volume *vol)
 34 {
 35         ntfs_debug("Entering.");
 36         if (likely(!NVolUsnJrnlStamped(vol))) {
 37                 sle64 stamp;
 38                 struct page *page;
 39                 USN_HEADER *uh;
 40 
 41                 page = ntfs_map_page(vol->usnjrnl_max_ino->i_mapping, 0);
 42                 if (IS_ERR(page)) {
 43                         ntfs_error(vol->sb, "Failed to read from "
 44                                         "$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(i_size_read(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 

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