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