746 lines
24 KiB
C
746 lines
24 KiB
C
/**
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* logfile.c - NTFS journal handling. Originated from the Linux-NTFS project.
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*
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* Copyright (c) 2002-2005 Anton Altaparmakov
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* Copyright (c) 2005 Yura Pakhuchiy
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* Copyright (c) 2005-2009 Szabolcs Szakacsits
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the NTFS-3G
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include "attrib.h"
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#include "debug.h"
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#include "logfile.h"
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#include "volume.h"
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#include "mst.h"
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#include "logging.h"
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#include "misc.h"
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/**
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* ntfs_check_restart_page_header - check the page header for consistency
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* @rp: restart page header to check
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* @pos: position in logfile at which the restart page header resides
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*
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* Check the restart page header @rp for consistency and return TRUE if it is
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* consistent and FALSE otherwise.
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*
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* This function only needs NTFS_BLOCK_SIZE bytes in @rp, i.e. it does not
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* require the full restart page.
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*/
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static BOOL ntfs_check_restart_page_header(RESTART_PAGE_HEADER *rp, s64 pos)
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{
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u32 logfile_system_page_size, logfile_log_page_size;
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u16 ra_ofs, usa_count, usa_ofs, usa_end = 0;
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BOOL have_usa = TRUE;
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ntfs_log_trace("Entering.\n");
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/*
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* If the system or log page sizes are smaller than the ntfs block size
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* or either is not a power of 2 we cannot handle this log file.
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*/
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logfile_system_page_size = le32_to_cpu(rp->system_page_size);
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logfile_log_page_size = le32_to_cpu(rp->log_page_size);
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if (logfile_system_page_size < NTFS_BLOCK_SIZE ||
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logfile_log_page_size < NTFS_BLOCK_SIZE ||
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logfile_system_page_size &
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(logfile_system_page_size - 1) ||
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logfile_log_page_size & (logfile_log_page_size - 1)) {
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ntfs_log_error("$LogFile uses unsupported page size.\n");
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return FALSE;
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}
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/*
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* We must be either at !pos (1st restart page) or at pos = system page
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* size (2nd restart page).
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*/
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if (pos && pos != logfile_system_page_size) {
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ntfs_log_error("Found restart area in incorrect "
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"position in $LogFile.\n");
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return FALSE;
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}
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/*
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* We only know how to handle version 1.1 and 2.0, though
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* version 2.0 is probably related to cached metadata in
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* Windows 8, and we will refuse to mount.
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* Nevertheless, do all the relevant checks before rejecting.
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*/
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if (((rp->major_ver != const_cpu_to_le16(1))
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|| (rp->minor_ver != const_cpu_to_le16(1)))
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&& ((rp->major_ver != const_cpu_to_le16(2))
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|| (rp->minor_ver != const_cpu_to_le16(0)))) {
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ntfs_log_error("$LogFile version %i.%i is not "
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"supported.\n (This driver supports version "
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"1.1 and 2.0 only.)\n",
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(int)sle16_to_cpu(rp->major_ver),
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(int)sle16_to_cpu(rp->minor_ver));
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return FALSE;
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}
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/*
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* If chkdsk has been run the restart page may not be protected by an
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* update sequence array.
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*/
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if (ntfs_is_chkd_record(rp->magic) && !le16_to_cpu(rp->usa_count)) {
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have_usa = FALSE;
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goto skip_usa_checks;
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}
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/* Verify the size of the update sequence array. */
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usa_count = 1 + (logfile_system_page_size >> NTFS_BLOCK_SIZE_BITS);
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if (usa_count != le16_to_cpu(rp->usa_count)) {
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ntfs_log_error("$LogFile restart page specifies "
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"inconsistent update sequence array count.\n");
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return FALSE;
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}
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/* Verify the position of the update sequence array. */
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usa_ofs = le16_to_cpu(rp->usa_ofs);
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usa_end = usa_ofs + usa_count * sizeof(u16);
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if (usa_ofs < sizeof(RESTART_PAGE_HEADER) ||
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usa_end > NTFS_BLOCK_SIZE - sizeof(u16)) {
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ntfs_log_error("$LogFile restart page specifies "
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"inconsistent update sequence array offset.\n");
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return FALSE;
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}
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skip_usa_checks:
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/*
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* Verify the position of the restart area. It must be:
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* - aligned to 8-byte boundary,
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* - after the update sequence array, and
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* - within the system page size.
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*/
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ra_ofs = le16_to_cpu(rp->restart_area_offset);
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if (ra_ofs & 7 || (have_usa ? ra_ofs < usa_end :
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ra_ofs < sizeof(RESTART_PAGE_HEADER)) ||
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ra_ofs > logfile_system_page_size) {
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ntfs_log_error("$LogFile restart page specifies "
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"inconsistent restart area offset.\n");
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return FALSE;
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}
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/*
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* Only restart pages modified by chkdsk are allowed to have chkdsk_lsn
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* set.
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*/
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if (!ntfs_is_chkd_record(rp->magic) && sle64_to_cpu(rp->chkdsk_lsn)) {
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ntfs_log_error("$LogFile restart page is not modified "
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"by chkdsk but a chkdsk LSN is specified.\n");
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return FALSE;
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}
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ntfs_log_trace("Done.\n");
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return TRUE;
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}
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/**
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* ntfs_check_restart_area - check the restart area for consistency
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* @rp: restart page whose restart area to check
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*
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* Check the restart area of the restart page @rp for consistency and return
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* TRUE if it is consistent and FALSE otherwise.
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*
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* This function assumes that the restart page header has already been
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* consistency checked.
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*
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* This function only needs NTFS_BLOCK_SIZE bytes in @rp, i.e. it does not
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* require the full restart page.
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*/
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static BOOL ntfs_check_restart_area(RESTART_PAGE_HEADER *rp)
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{
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u64 file_size;
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RESTART_AREA *ra;
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u16 ra_ofs, ra_len, ca_ofs;
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u8 fs_bits;
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ntfs_log_trace("Entering.\n");
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ra_ofs = le16_to_cpu(rp->restart_area_offset);
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ra = (RESTART_AREA*)((u8*)rp + ra_ofs);
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/*
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* Everything before ra->file_size must be before the first word
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* protected by an update sequence number. This ensures that it is
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* safe to access ra->client_array_offset.
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*/
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if (ra_ofs + offsetof(RESTART_AREA, file_size) >
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NTFS_BLOCK_SIZE - sizeof(u16)) {
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ntfs_log_error("$LogFile restart area specifies "
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"inconsistent file offset.\n");
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return FALSE;
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}
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/*
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* Now that we can access ra->client_array_offset, make sure everything
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* up to the log client array is before the first word protected by an
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* update sequence number. This ensures we can access all of the
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* restart area elements safely. Also, the client array offset must be
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* aligned to an 8-byte boundary.
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*/
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ca_ofs = le16_to_cpu(ra->client_array_offset);
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if (((ca_ofs + 7) & ~7) != ca_ofs ||
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ra_ofs + ca_ofs > (u16)(NTFS_BLOCK_SIZE -
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sizeof(u16))) {
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ntfs_log_error("$LogFile restart area specifies "
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"inconsistent client array offset.\n");
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return FALSE;
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}
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/*
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* The restart area must end within the system page size both when
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* calculated manually and as specified by ra->restart_area_length.
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* Also, the calculated length must not exceed the specified length.
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*/
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ra_len = ca_ofs + le16_to_cpu(ra->log_clients) *
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sizeof(LOG_CLIENT_RECORD);
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if ((u32)(ra_ofs + ra_len) > le32_to_cpu(rp->system_page_size) ||
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(u32)(ra_ofs + le16_to_cpu(ra->restart_area_length)) >
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le32_to_cpu(rp->system_page_size) ||
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ra_len > le16_to_cpu(ra->restart_area_length)) {
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ntfs_log_error("$LogFile restart area is out of bounds "
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"of the system page size specified by the "
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"restart page header and/or the specified "
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"restart area length is inconsistent.\n");
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return FALSE;
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}
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/*
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* The ra->client_free_list and ra->client_in_use_list must be either
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* LOGFILE_NO_CLIENT or less than ra->log_clients or they are
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* overflowing the client array.
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*/
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if ((ra->client_free_list != LOGFILE_NO_CLIENT &&
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le16_to_cpu(ra->client_free_list) >=
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le16_to_cpu(ra->log_clients)) ||
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(ra->client_in_use_list != LOGFILE_NO_CLIENT &&
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le16_to_cpu(ra->client_in_use_list) >=
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le16_to_cpu(ra->log_clients))) {
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ntfs_log_error("$LogFile restart area specifies "
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"overflowing client free and/or in use lists.\n");
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return FALSE;
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}
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/*
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* Check ra->seq_number_bits against ra->file_size for consistency.
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* We cannot just use ffs() because the file size is not a power of 2.
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*/
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file_size = (u64)sle64_to_cpu(ra->file_size);
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fs_bits = 0;
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while (file_size) {
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file_size >>= 1;
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fs_bits++;
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}
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if (le32_to_cpu(ra->seq_number_bits) != (u32)(67 - fs_bits)) {
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ntfs_log_error("$LogFile restart area specifies "
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"inconsistent sequence number bits.\n");
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return FALSE;
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}
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/* The log record header length must be a multiple of 8. */
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if (((le16_to_cpu(ra->log_record_header_length) + 7) & ~7) !=
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le16_to_cpu(ra->log_record_header_length)) {
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ntfs_log_error("$LogFile restart area specifies "
|
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"inconsistent log record header length.\n");
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return FALSE;
|
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}
|
|
/* Ditto for the log page data offset. */
|
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if (((le16_to_cpu(ra->log_page_data_offset) + 7) & ~7) !=
|
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le16_to_cpu(ra->log_page_data_offset)) {
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ntfs_log_error("$LogFile restart area specifies "
|
|
"inconsistent log page data offset.\n");
|
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return FALSE;
|
|
}
|
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ntfs_log_trace("Done.\n");
|
|
return TRUE;
|
|
}
|
|
|
|
/**
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* ntfs_check_log_client_array - check the log client array for consistency
|
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* @rp: restart page whose log client array to check
|
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*
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* Check the log client array of the restart page @rp for consistency and
|
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* return TRUE if it is consistent and FALSE otherwise.
|
|
*
|
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* This function assumes that the restart page header and the restart area have
|
|
* already been consistency checked.
|
|
*
|
|
* Unlike ntfs_check_restart_page_header() and ntfs_check_restart_area(), this
|
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* function needs @rp->system_page_size bytes in @rp, i.e. it requires the full
|
|
* restart page and the page must be multi sector transfer deprotected.
|
|
*/
|
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static BOOL ntfs_check_log_client_array(RESTART_PAGE_HEADER *rp)
|
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{
|
|
RESTART_AREA *ra;
|
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LOG_CLIENT_RECORD *ca, *cr;
|
|
u16 nr_clients, idx;
|
|
BOOL in_free_list, idx_is_first;
|
|
|
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ntfs_log_trace("Entering.\n");
|
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ra = (RESTART_AREA*)((u8*)rp + le16_to_cpu(rp->restart_area_offset));
|
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ca = (LOG_CLIENT_RECORD*)((u8*)ra +
|
|
le16_to_cpu(ra->client_array_offset));
|
|
/*
|
|
* Check the ra->client_free_list first and then check the
|
|
* ra->client_in_use_list. Check each of the log client records in
|
|
* each of the lists and check that the array does not overflow the
|
|
* ra->log_clients value. Also keep track of the number of records
|
|
* visited as there cannot be more than ra->log_clients records and
|
|
* that way we detect eventual loops in within a list.
|
|
*/
|
|
nr_clients = le16_to_cpu(ra->log_clients);
|
|
idx = le16_to_cpu(ra->client_free_list);
|
|
in_free_list = TRUE;
|
|
check_list:
|
|
for (idx_is_first = TRUE; idx != LOGFILE_NO_CLIENT_CPU; nr_clients--,
|
|
idx = le16_to_cpu(cr->next_client)) {
|
|
if (!nr_clients || idx >= le16_to_cpu(ra->log_clients))
|
|
goto err_out;
|
|
/* Set @cr to the current log client record. */
|
|
cr = ca + idx;
|
|
/* The first log client record must not have a prev_client. */
|
|
if (idx_is_first) {
|
|
if (cr->prev_client != LOGFILE_NO_CLIENT)
|
|
goto err_out;
|
|
idx_is_first = FALSE;
|
|
}
|
|
}
|
|
/* Switch to and check the in use list if we just did the free list. */
|
|
if (in_free_list) {
|
|
in_free_list = FALSE;
|
|
idx = le16_to_cpu(ra->client_in_use_list);
|
|
goto check_list;
|
|
}
|
|
ntfs_log_trace("Done.\n");
|
|
return TRUE;
|
|
err_out:
|
|
ntfs_log_error("$LogFile log client array is corrupt.\n");
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* ntfs_check_and_load_restart_page - check the restart page for consistency
|
|
* @log_na: opened ntfs attribute for journal $LogFile
|
|
* @rp: restart page to check
|
|
* @pos: position in @log_na at which the restart page resides
|
|
* @wrp: [OUT] copy of the multi sector transfer deprotected restart page
|
|
* @lsn: [OUT] set to the current logfile lsn on success
|
|
*
|
|
* Check the restart page @rp for consistency and return 0 if it is consistent
|
|
* and errno otherwise. The restart page may have been modified by chkdsk in
|
|
* which case its magic is CHKD instead of RSTR.
|
|
*
|
|
* This function only needs NTFS_BLOCK_SIZE bytes in @rp, i.e. it does not
|
|
* require the full restart page.
|
|
*
|
|
* If @wrp is not NULL, on success, *@wrp will point to a buffer containing a
|
|
* copy of the complete multi sector transfer deprotected page. On failure,
|
|
* *@wrp is undefined.
|
|
*
|
|
* Similarly, if @lsn is not NULL, on success *@lsn will be set to the current
|
|
* logfile lsn according to this restart page. On failure, *@lsn is undefined.
|
|
*
|
|
* The following error codes are defined:
|
|
* EINVAL - The restart page is inconsistent.
|
|
* ENOMEM - Not enough memory to load the restart page.
|
|
* EIO - Failed to reading from $LogFile.
|
|
*/
|
|
static int ntfs_check_and_load_restart_page(ntfs_attr *log_na,
|
|
RESTART_PAGE_HEADER *rp, s64 pos, RESTART_PAGE_HEADER **wrp,
|
|
LSN *lsn)
|
|
{
|
|
RESTART_AREA *ra;
|
|
RESTART_PAGE_HEADER *trp;
|
|
int err;
|
|
|
|
ntfs_log_trace("Entering.\n");
|
|
/* Check the restart page header for consistency. */
|
|
if (!ntfs_check_restart_page_header(rp, pos)) {
|
|
/* Error output already done inside the function. */
|
|
return EINVAL;
|
|
}
|
|
/* Check the restart area for consistency. */
|
|
if (!ntfs_check_restart_area(rp)) {
|
|
/* Error output already done inside the function. */
|
|
return EINVAL;
|
|
}
|
|
ra = (RESTART_AREA*)((u8*)rp + le16_to_cpu(rp->restart_area_offset));
|
|
/*
|
|
* Allocate a buffer to store the whole restart page so we can multi
|
|
* sector transfer deprotect it.
|
|
*/
|
|
trp = ntfs_malloc(le32_to_cpu(rp->system_page_size));
|
|
if (!trp)
|
|
return errno;
|
|
/*
|
|
* Read the whole of the restart page into the buffer. If it fits
|
|
* completely inside @rp, just copy it from there. Otherwise read it
|
|
* from disk.
|
|
*/
|
|
if (le32_to_cpu(rp->system_page_size) <= NTFS_BLOCK_SIZE)
|
|
memcpy(trp, rp, le32_to_cpu(rp->system_page_size));
|
|
else if (ntfs_attr_pread(log_na, pos,
|
|
le32_to_cpu(rp->system_page_size), trp) !=
|
|
le32_to_cpu(rp->system_page_size)) {
|
|
err = errno;
|
|
ntfs_log_error("Failed to read whole restart page into the "
|
|
"buffer.\n");
|
|
if (err != ENOMEM)
|
|
err = EIO;
|
|
goto err_out;
|
|
}
|
|
/*
|
|
* Perform the multi sector transfer deprotection on the buffer if the
|
|
* restart page is protected.
|
|
*/
|
|
if ((!ntfs_is_chkd_record(trp->magic) || le16_to_cpu(trp->usa_count))
|
|
&& ntfs_mst_post_read_fixup((NTFS_RECORD*)trp,
|
|
le32_to_cpu(rp->system_page_size))) {
|
|
/*
|
|
* A multi sector tranfer error was detected. We only need to
|
|
* abort if the restart page contents exceed the multi sector
|
|
* transfer fixup of the first sector.
|
|
*/
|
|
if (le16_to_cpu(rp->restart_area_offset) +
|
|
le16_to_cpu(ra->restart_area_length) >
|
|
NTFS_BLOCK_SIZE - (int)sizeof(u16)) {
|
|
ntfs_log_error("Multi sector transfer error "
|
|
"detected in $LogFile restart page.\n");
|
|
err = EINVAL;
|
|
goto err_out;
|
|
}
|
|
}
|
|
/*
|
|
* If the restart page is modified by chkdsk or there are no active
|
|
* logfile clients, the logfile is consistent. Otherwise, need to
|
|
* check the log client records for consistency, too.
|
|
*/
|
|
err = 0;
|
|
if (ntfs_is_rstr_record(rp->magic) &&
|
|
ra->client_in_use_list != LOGFILE_NO_CLIENT) {
|
|
if (!ntfs_check_log_client_array(trp)) {
|
|
err = EINVAL;
|
|
goto err_out;
|
|
}
|
|
}
|
|
if (lsn) {
|
|
if (ntfs_is_rstr_record(rp->magic))
|
|
*lsn = sle64_to_cpu(ra->current_lsn);
|
|
else /* if (ntfs_is_chkd_record(rp->magic)) */
|
|
*lsn = sle64_to_cpu(rp->chkdsk_lsn);
|
|
}
|
|
ntfs_log_trace("Done.\n");
|
|
if (wrp)
|
|
*wrp = trp;
|
|
else {
|
|
err_out:
|
|
free(trp);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ntfs_check_logfile - check in the journal if the volume is consistent
|
|
* @log_na: ntfs attribute of loaded journal $LogFile to check
|
|
* @rp: [OUT] on success this is a copy of the current restart page
|
|
*
|
|
* Check the $LogFile journal for consistency and return TRUE if it is
|
|
* consistent and FALSE if not. On success, the current restart page is
|
|
* returned in *@rp. Caller must call ntfs_free(*@rp) when finished with it.
|
|
*
|
|
* At present we only check the two restart pages and ignore the log record
|
|
* pages.
|
|
*
|
|
* Note that the MstProtected flag is not set on the $LogFile inode and hence
|
|
* when reading pages they are not deprotected. This is because we do not know
|
|
* if the $LogFile was created on a system with a different page size to ours
|
|
* yet and mst deprotection would fail if our page size is smaller.
|
|
*/
|
|
BOOL ntfs_check_logfile(ntfs_attr *log_na, RESTART_PAGE_HEADER **rp)
|
|
{
|
|
s64 size, pos;
|
|
LSN rstr1_lsn, rstr2_lsn;
|
|
ntfs_volume *vol = log_na->ni->vol;
|
|
u8 *kaddr = NULL;
|
|
RESTART_PAGE_HEADER *rstr1_ph = NULL;
|
|
RESTART_PAGE_HEADER *rstr2_ph = NULL;
|
|
int log_page_size, err;
|
|
BOOL logfile_is_empty = TRUE;
|
|
u8 log_page_bits;
|
|
|
|
ntfs_log_trace("Entering.\n");
|
|
/* An empty $LogFile must have been clean before it got emptied. */
|
|
if (NVolLogFileEmpty(vol))
|
|
goto is_empty;
|
|
size = log_na->data_size;
|
|
/* Make sure the file doesn't exceed the maximum allowed size. */
|
|
if (size > (s64)MaxLogFileSize)
|
|
size = MaxLogFileSize;
|
|
log_page_size = DefaultLogPageSize;
|
|
/*
|
|
* Use generic_ffs() instead of ffs() to enable the compiler to
|
|
* optimize log_page_size and log_page_bits into constants.
|
|
*/
|
|
log_page_bits = ffs(log_page_size) - 1;
|
|
size &= ~(log_page_size - 1);
|
|
|
|
/*
|
|
* Ensure the log file is big enough to store at least the two restart
|
|
* pages and the minimum number of log record pages.
|
|
*/
|
|
if (size < log_page_size * 2 || (size - log_page_size * 2) >>
|
|
log_page_bits < MinLogRecordPages) {
|
|
ntfs_log_error("$LogFile is too small.\n");
|
|
return FALSE;
|
|
}
|
|
/* Allocate memory for restart page. */
|
|
kaddr = ntfs_malloc(NTFS_BLOCK_SIZE);
|
|
if (!kaddr)
|
|
return FALSE;
|
|
/*
|
|
* Read through the file looking for a restart page. Since the restart
|
|
* page header is at the beginning of a page we only need to search at
|
|
* what could be the beginning of a page (for each page size) rather
|
|
* than scanning the whole file byte by byte. If all potential places
|
|
* contain empty and uninitialized records, the log file can be assumed
|
|
* to be empty.
|
|
*/
|
|
for (pos = 0; pos < size; pos <<= 1) {
|
|
/*
|
|
* Read first NTFS_BLOCK_SIZE bytes of potential restart page.
|
|
*/
|
|
if (ntfs_attr_pread(log_na, pos, NTFS_BLOCK_SIZE, kaddr) !=
|
|
NTFS_BLOCK_SIZE) {
|
|
ntfs_log_error("Failed to read first NTFS_BLOCK_SIZE "
|
|
"bytes of potential restart page.\n");
|
|
goto err_out;
|
|
}
|
|
|
|
/*
|
|
* A non-empty block means the logfile is not empty while an
|
|
* empty block after a non-empty block has been encountered
|
|
* means we are done.
|
|
*/
|
|
if (!ntfs_is_empty_recordp((le32*)kaddr))
|
|
logfile_is_empty = FALSE;
|
|
else if (!logfile_is_empty)
|
|
break;
|
|
/*
|
|
* A log record page means there cannot be a restart page after
|
|
* this so no need to continue searching.
|
|
*/
|
|
if (ntfs_is_rcrd_recordp((le32*)kaddr))
|
|
break;
|
|
/* If not a (modified by chkdsk) restart page, continue. */
|
|
if (!ntfs_is_rstr_recordp((le32*)kaddr) &&
|
|
!ntfs_is_chkd_recordp((le32*)kaddr)) {
|
|
if (!pos)
|
|
pos = NTFS_BLOCK_SIZE >> 1;
|
|
continue;
|
|
}
|
|
/*
|
|
* Check the (modified by chkdsk) restart page for consistency
|
|
* and get a copy of the complete multi sector transfer
|
|
* deprotected restart page.
|
|
*/
|
|
err = ntfs_check_and_load_restart_page(log_na,
|
|
(RESTART_PAGE_HEADER*)kaddr, pos,
|
|
!rstr1_ph ? &rstr1_ph : &rstr2_ph,
|
|
!rstr1_ph ? &rstr1_lsn : &rstr2_lsn);
|
|
if (!err) {
|
|
/*
|
|
* If we have now found the first (modified by chkdsk)
|
|
* restart page, continue looking for the second one.
|
|
*/
|
|
if (!pos) {
|
|
pos = NTFS_BLOCK_SIZE >> 1;
|
|
continue;
|
|
}
|
|
/*
|
|
* We have now found the second (modified by chkdsk)
|
|
* restart page, so we can stop looking.
|
|
*/
|
|
break;
|
|
}
|
|
/*
|
|
* Error output already done inside the function. Note, we do
|
|
* not abort if the restart page was invalid as we might still
|
|
* find a valid one further in the file.
|
|
*/
|
|
if (err != EINVAL)
|
|
goto err_out;
|
|
/* Continue looking. */
|
|
if (!pos)
|
|
pos = NTFS_BLOCK_SIZE >> 1;
|
|
}
|
|
if (kaddr) {
|
|
free(kaddr);
|
|
kaddr = NULL;
|
|
}
|
|
if (logfile_is_empty) {
|
|
NVolSetLogFileEmpty(vol);
|
|
is_empty:
|
|
ntfs_log_trace("Done. ($LogFile is empty.)\n");
|
|
return TRUE;
|
|
}
|
|
if (!rstr1_ph) {
|
|
if (rstr2_ph)
|
|
ntfs_log_error("BUG: rstr2_ph isn't NULL!\n");
|
|
ntfs_log_error("Did not find any restart pages in "
|
|
"$LogFile and it was not empty.\n");
|
|
return FALSE;
|
|
}
|
|
/* If both restart pages were found, use the more recent one. */
|
|
if (rstr2_ph) {
|
|
/*
|
|
* If the second restart area is more recent, switch to it.
|
|
* Otherwise just throw it away.
|
|
*/
|
|
if (rstr2_lsn > rstr1_lsn) {
|
|
ntfs_log_debug("Using second restart page as it is more "
|
|
"recent.\n");
|
|
free(rstr1_ph);
|
|
rstr1_ph = rstr2_ph;
|
|
/* rstr1_lsn = rstr2_lsn; */
|
|
} else {
|
|
ntfs_log_debug("Using first restart page as it is more "
|
|
"recent.\n");
|
|
free(rstr2_ph);
|
|
}
|
|
rstr2_ph = NULL;
|
|
}
|
|
/* All consistency checks passed. */
|
|
if (rp)
|
|
*rp = rstr1_ph;
|
|
else
|
|
free(rstr1_ph);
|
|
ntfs_log_trace("Done.\n");
|
|
return TRUE;
|
|
err_out:
|
|
free(kaddr);
|
|
free(rstr1_ph);
|
|
free(rstr2_ph);
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* ntfs_is_logfile_clean - check in the journal if the volume is clean
|
|
* @log_na: ntfs attribute of loaded journal $LogFile to check
|
|
* @rp: copy of the current restart page
|
|
*
|
|
* Analyze the $LogFile journal and return TRUE if it indicates the volume was
|
|
* shutdown cleanly and FALSE if not.
|
|
*
|
|
* At present we only look at the two restart pages and ignore the log record
|
|
* pages. This is a little bit crude in that there will be a very small number
|
|
* of cases where we think that a volume is dirty when in fact it is clean.
|
|
* This should only affect volumes that have not been shutdown cleanly but did
|
|
* not have any pending, non-check-pointed i/o, i.e. they were completely idle
|
|
* at least for the five seconds preceding the unclean shutdown.
|
|
*
|
|
* This function assumes that the $LogFile journal has already been consistency
|
|
* checked by a call to ntfs_check_logfile() and in particular if the $LogFile
|
|
* is empty this function requires that NVolLogFileEmpty() is true otherwise an
|
|
* empty volume will be reported as dirty.
|
|
*/
|
|
BOOL ntfs_is_logfile_clean(ntfs_attr *log_na, RESTART_PAGE_HEADER *rp)
|
|
{
|
|
RESTART_AREA *ra;
|
|
|
|
ntfs_log_trace("Entering.\n");
|
|
/* An empty $LogFile must have been clean before it got emptied. */
|
|
if (NVolLogFileEmpty(log_na->ni->vol)) {
|
|
ntfs_log_trace("$LogFile is empty\n");
|
|
return TRUE;
|
|
}
|
|
if (!rp) {
|
|
ntfs_log_error("Restart page header is NULL\n");
|
|
return FALSE;
|
|
}
|
|
if (!ntfs_is_rstr_record(rp->magic) &&
|
|
!ntfs_is_chkd_record(rp->magic)) {
|
|
ntfs_log_error("Restart page buffer is invalid\n");
|
|
return FALSE;
|
|
}
|
|
|
|
ra = (RESTART_AREA*)((u8*)rp + le16_to_cpu(rp->restart_area_offset));
|
|
/*
|
|
* If the $LogFile has active clients, i.e. it is open, and we do not
|
|
* have the RESTART_VOLUME_IS_CLEAN bit set in the restart area flags,
|
|
* we assume there was an unclean shutdown.
|
|
*/
|
|
if (ra->client_in_use_list != LOGFILE_NO_CLIENT &&
|
|
!(ra->flags & RESTART_VOLUME_IS_CLEAN)) {
|
|
ntfs_log_error("The disk contains an unclean file system (%d, "
|
|
"%d).\n", le16_to_cpu(ra->client_in_use_list),
|
|
le16_to_cpu(ra->flags));
|
|
return FALSE;
|
|
}
|
|
/* $LogFile indicates a clean shutdown. */
|
|
ntfs_log_trace("$LogFile indicates a clean shutdown\n");
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* ntfs_empty_logfile - empty the contents of the $LogFile journal
|
|
* @na: ntfs attribute of journal $LogFile to empty
|
|
*
|
|
* Empty the contents of the $LogFile journal @na and return 0 on success and
|
|
* -1 on error.
|
|
*
|
|
* This function assumes that the $LogFile journal has already been consistency
|
|
* checked by a call to ntfs_check_logfile() and that ntfs_is_logfile_clean()
|
|
* has been used to ensure that the $LogFile is clean.
|
|
*/
|
|
int ntfs_empty_logfile(ntfs_attr *na)
|
|
{
|
|
s64 pos, count;
|
|
char buf[NTFS_BUF_SIZE];
|
|
|
|
ntfs_log_trace("Entering.\n");
|
|
|
|
if (NVolLogFileEmpty(na->ni->vol))
|
|
return 0;
|
|
|
|
if (!NAttrNonResident(na)) {
|
|
errno = EIO;
|
|
ntfs_log_perror("Resident $LogFile $DATA attribute");
|
|
return -1;
|
|
}
|
|
|
|
memset(buf, -1, NTFS_BUF_SIZE);
|
|
|
|
pos = 0;
|
|
while ((count = na->data_size - pos) > 0) {
|
|
|
|
if (count > NTFS_BUF_SIZE)
|
|
count = NTFS_BUF_SIZE;
|
|
|
|
count = ntfs_attr_pwrite(na, pos, count, buf);
|
|
if (count <= 0) {
|
|
ntfs_log_perror("Failed to reset $LogFile");
|
|
if (count != -1)
|
|
errno = EIO;
|
|
return -1;
|
|
}
|
|
pos += count;
|
|
if(pos>=64*1024) break; //only clear first 64kb
|
|
}
|
|
|
|
NVolSetLogFileEmpty(na->ni->vol);
|
|
|
|
return 0;
|
|
}
|