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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 ($UsnJrnl) on the ntfs volume @vol and return
 42  * 'true' on success and 'false' on error.
 43  *
 44  * This function assumes that the transaction log has already been loaded and
 45  * consistency checked by a call to fs/ntfs/super.c::load_and_init_usnjrnl().
 46  */
 47 bool ntfs_stamp_usnjrnl(ntfs_volume *vol)
 48 {
 49         ntfs_debug("Entering.");
 50         if (likely(!NVolUsnJrnlStamped(vol))) {
 51                 sle64 stamp;
 52                 struct page *page;
 53                 USN_HEADER *uh;
 54 
 55                 page = ntfs_map_page(vol->usnjrnl_max_ino->i_mapping, 0);
 56                 if (IS_ERR(page)) {
 57                         ntfs_error(vol->sb, "Failed to read from "
 58                                         "$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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