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