/*
   * usnjrnl.h - NTFS kernel transaction log ($UsnJrnl) handling.  Part of the
   *	       Linux-NTFS project.
   *
   * Copyright (c) 2005 Anton Altaparmakov
   *
   * This program/include file is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as published
   * by the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program/include file is distributed in the hope that it will be
   * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
   * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program (in the main directory of the Linux-NTFS
   * distribution in the file COPYING); if not, write to the Free Software
   * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  #ifdef NTFS_RW
  
  #include <linux/fs.h>
  #include <linux/highmem.h>
  #include <linux/mm.h>
  
  #include "aops.h"
  #include "debug.h"
  #include "endian.h"
  #include "time.h"
  #include "types.h"
  #include "usnjrnl.h"
  #include "volume.h"
  
  /**
   * ntfs_stamp_usnjrnl - stamp the transaction log ($UsnJrnl) on an ntfs volume
   * @vol:	ntfs volume on which to stamp the transaction log
   *
   * Stamp the transaction log ($UsnJrnl) on the ntfs volume @vol and return

   * 'true' on success and 'false' on error.

   *
   * This function assumes that the transaction log has already been loaded and
   * consistency checked by a call to fs/ntfs/super.c::load_and_init_usnjrnl().
   */

  bool ntfs_stamp_usnjrnl(ntfs_volume *vol)

  {
  	ntfs_debug("Entering.");
  	if (likely(!NVolUsnJrnlStamped(vol))) {
  		sle64 stamp;
  		struct page *page;
  		USN_HEADER *uh;
  
  		page = ntfs_map_page(vol->usnjrnl_max_ino->i_mapping, 0);
  		if (IS_ERR(page)) {
  			ntfs_error(vol->sb, "Failed to read from "
  					"$UsnJrnl/$DATA/$Max attribute.");

  			return false;

  		}
  		uh = (USN_HEADER*)page_address(page);
  		stamp = get_current_ntfs_time();
  		ntfs_debug("Stamping transaction log ($UsnJrnl): old "
  				"journal_id 0x%llx, old lowest_valid_usn "
  				"0x%llx, new journal_id 0x%llx, new "
  				"lowest_valid_usn 0x%llx.",
  				(long long)sle64_to_cpu(uh->journal_id),
  				(long long)sle64_to_cpu(uh->lowest_valid_usn),
  				(long long)sle64_to_cpu(stamp),
  				i_size_read(vol->usnjrnl_j_ino));
  		uh->lowest_valid_usn =
  				cpu_to_sle64(i_size_read(vol->usnjrnl_j_ino));
  		uh->journal_id = stamp;
  		flush_dcache_page(page);
  		set_page_dirty(page);
  		ntfs_unmap_page(page);
  		/* Set the flag so we do not have to do it again on remount. */
  		NVolSetUsnJrnlStamped(vol);
  	}
  	ntfs_debug("Done.");

  	return true;

  }
  
  #endif /* NTFS_RW */