706 строки
23 KiB
C
706 строки
23 KiB
C
/*
|
|
* logfile.c - NTFS kernel journal handling. Part of the Linux-NTFS project.
|
|
*
|
|
* Copyright (c) 2002-2004 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/types.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include "attrib.h"
|
|
#include "aops.h"
|
|
#include "debug.h"
|
|
#include "logfile.h"
|
|
#include "malloc.h"
|
|
#include "volume.h"
|
|
#include "ntfs.h"
|
|
|
|
/**
|
|
* ntfs_check_restart_page_header - check the page header for consistency
|
|
* @vi: $LogFile inode to which the restart page header belongs
|
|
* @rp: restart page header to check
|
|
* @pos: position in @vi at which the restart page header resides
|
|
*
|
|
* Check the restart page header @rp for consistency and return TRUE if it is
|
|
* consistent and FALSE otherwise.
|
|
*
|
|
* This function only needs NTFS_BLOCK_SIZE bytes in @rp, i.e. it does not
|
|
* require the full restart page.
|
|
*/
|
|
static BOOL ntfs_check_restart_page_header(struct inode *vi,
|
|
RESTART_PAGE_HEADER *rp, s64 pos)
|
|
{
|
|
u32 logfile_system_page_size, logfile_log_page_size;
|
|
u16 usa_count, usa_ofs, usa_end, ra_ofs;
|
|
|
|
ntfs_debug("Entering.");
|
|
/*
|
|
* If the system or log page sizes are smaller than the ntfs block size
|
|
* or either is not a power of 2 we cannot handle this log file.
|
|
*/
|
|
logfile_system_page_size = le32_to_cpu(rp->system_page_size);
|
|
logfile_log_page_size = le32_to_cpu(rp->log_page_size);
|
|
if (logfile_system_page_size < NTFS_BLOCK_SIZE ||
|
|
logfile_log_page_size < NTFS_BLOCK_SIZE ||
|
|
logfile_system_page_size &
|
|
(logfile_system_page_size - 1) ||
|
|
logfile_log_page_size & (logfile_log_page_size - 1)) {
|
|
ntfs_error(vi->i_sb, "$LogFile uses unsupported page size.");
|
|
return FALSE;
|
|
}
|
|
/*
|
|
* We must be either at !pos (1st restart page) or at pos = system page
|
|
* size (2nd restart page).
|
|
*/
|
|
if (pos && pos != logfile_system_page_size) {
|
|
ntfs_error(vi->i_sb, "Found restart area in incorrect "
|
|
"position in $LogFile.");
|
|
return FALSE;
|
|
}
|
|
/* We only know how to handle version 1.1. */
|
|
if (sle16_to_cpu(rp->major_ver) != 1 ||
|
|
sle16_to_cpu(rp->minor_ver) != 1) {
|
|
ntfs_error(vi->i_sb, "$LogFile version %i.%i is not "
|
|
"supported. (This driver supports version "
|
|
"1.1 only.)", (int)sle16_to_cpu(rp->major_ver),
|
|
(int)sle16_to_cpu(rp->minor_ver));
|
|
return FALSE;
|
|
}
|
|
/* Verify the size of the update sequence array. */
|
|
usa_count = 1 + (logfile_system_page_size >> NTFS_BLOCK_SIZE_BITS);
|
|
if (usa_count != le16_to_cpu(rp->usa_count)) {
|
|
ntfs_error(vi->i_sb, "$LogFile restart page specifies "
|
|
"inconsistent update sequence array count.");
|
|
return FALSE;
|
|
}
|
|
/* Verify the position of the update sequence array. */
|
|
usa_ofs = le16_to_cpu(rp->usa_ofs);
|
|
usa_end = usa_ofs + usa_count * sizeof(u16);
|
|
if (usa_ofs < sizeof(RESTART_PAGE_HEADER) ||
|
|
usa_end > NTFS_BLOCK_SIZE - sizeof(u16)) {
|
|
ntfs_error(vi->i_sb, "$LogFile restart page specifies "
|
|
"inconsistent update sequence array offset.");
|
|
return FALSE;
|
|
}
|
|
/*
|
|
* Verify the position of the restart area. It must be:
|
|
* - aligned to 8-byte boundary,
|
|
* - after the update sequence array, and
|
|
* - within the system page size.
|
|
*/
|
|
ra_ofs = le16_to_cpu(rp->restart_area_offset);
|
|
if (ra_ofs & 7 || ra_ofs < usa_end ||
|
|
ra_ofs > logfile_system_page_size) {
|
|
ntfs_error(vi->i_sb, "$LogFile restart page specifies "
|
|
"inconsistent restart area offset.");
|
|
return FALSE;
|
|
}
|
|
/*
|
|
* Only restart pages modified by chkdsk are allowed to have chkdsk_lsn
|
|
* set.
|
|
*/
|
|
if (!ntfs_is_chkd_record(rp->magic) && sle64_to_cpu(rp->chkdsk_lsn)) {
|
|
ntfs_error(vi->i_sb, "$LogFile restart page is not modified "
|
|
"chkdsk but a chkdsk LSN is specified.");
|
|
return FALSE;
|
|
}
|
|
ntfs_debug("Done.");
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* ntfs_check_restart_area - check the restart area for consistency
|
|
* @vi: $LogFile inode to which the restart page belongs
|
|
* @rp: restart page whose restart area to check
|
|
*
|
|
* Check the restart area of the restart page @rp for consistency and return
|
|
* TRUE if it is consistent and FALSE otherwise.
|
|
*
|
|
* This function assumes that the restart page header has already been
|
|
* consistency checked.
|
|
*
|
|
* This function only needs NTFS_BLOCK_SIZE bytes in @rp, i.e. it does not
|
|
* require the full restart page.
|
|
*/
|
|
static BOOL ntfs_check_restart_area(struct inode *vi, RESTART_PAGE_HEADER *rp)
|
|
{
|
|
u64 file_size;
|
|
RESTART_AREA *ra;
|
|
u16 ra_ofs, ra_len, ca_ofs;
|
|
u8 fs_bits;
|
|
|
|
ntfs_debug("Entering.");
|
|
ra_ofs = le16_to_cpu(rp->restart_area_offset);
|
|
ra = (RESTART_AREA*)((u8*)rp + ra_ofs);
|
|
/*
|
|
* Everything before ra->file_size must be before the first word
|
|
* protected by an update sequence number. This ensures that it is
|
|
* safe to access ra->client_array_offset.
|
|
*/
|
|
if (ra_ofs + offsetof(RESTART_AREA, file_size) >
|
|
NTFS_BLOCK_SIZE - sizeof(u16)) {
|
|
ntfs_error(vi->i_sb, "$LogFile restart area specifies "
|
|
"inconsistent file offset.");
|
|
return FALSE;
|
|
}
|
|
/*
|
|
* Now that we can access ra->client_array_offset, make sure everything
|
|
* up to the log client array is before the first word protected by an
|
|
* update sequence number. This ensures we can access all of the
|
|
* restart area elements safely. Also, the client array offset must be
|
|
* aligned to an 8-byte boundary.
|
|
*/
|
|
ca_ofs = le16_to_cpu(ra->client_array_offset);
|
|
if (((ca_ofs + 7) & ~7) != ca_ofs ||
|
|
ra_ofs + ca_ofs > NTFS_BLOCK_SIZE - sizeof(u16)) {
|
|
ntfs_error(vi->i_sb, "$LogFile restart area specifies "
|
|
"inconsistent client array offset.");
|
|
return FALSE;
|
|
}
|
|
/*
|
|
* The restart area must end within the system page size both when
|
|
* calculated manually and as specified by ra->restart_area_length.
|
|
* Also, the calculated length must not exceed the specified length.
|
|
*/
|
|
ra_len = ca_ofs + le16_to_cpu(ra->log_clients) *
|
|
sizeof(LOG_CLIENT_RECORD);
|
|
if (ra_ofs + ra_len > le32_to_cpu(rp->system_page_size) ||
|
|
ra_ofs + le16_to_cpu(ra->restart_area_length) >
|
|
le32_to_cpu(rp->system_page_size) ||
|
|
ra_len > le16_to_cpu(ra->restart_area_length)) {
|
|
ntfs_error(vi->i_sb, "$LogFile restart area is out of bounds "
|
|
"of the system page size specified by the "
|
|
"restart page header and/or the specified "
|
|
"restart area length is inconsistent.");
|
|
return FALSE;
|
|
}
|
|
/*
|
|
* The ra->client_free_list and ra->client_in_use_list must be either
|
|
* LOGFILE_NO_CLIENT or less than ra->log_clients or they are
|
|
* overflowing the client array.
|
|
*/
|
|
if ((ra->client_free_list != LOGFILE_NO_CLIENT &&
|
|
le16_to_cpu(ra->client_free_list) >=
|
|
le16_to_cpu(ra->log_clients)) ||
|
|
(ra->client_in_use_list != LOGFILE_NO_CLIENT &&
|
|
le16_to_cpu(ra->client_in_use_list) >=
|
|
le16_to_cpu(ra->log_clients))) {
|
|
ntfs_error(vi->i_sb, "$LogFile restart area specifies "
|
|
"overflowing client free and/or in use lists.");
|
|
return FALSE;
|
|
}
|
|
/*
|
|
* Check ra->seq_number_bits against ra->file_size for consistency.
|
|
* We cannot just use ffs() because the file size is not a power of 2.
|
|
*/
|
|
file_size = (u64)sle64_to_cpu(ra->file_size);
|
|
fs_bits = 0;
|
|
while (file_size) {
|
|
file_size >>= 1;
|
|
fs_bits++;
|
|
}
|
|
if (le32_to_cpu(ra->seq_number_bits) != 67 - fs_bits) {
|
|
ntfs_error(vi->i_sb, "$LogFile restart area specifies "
|
|
"inconsistent sequence number bits.");
|
|
return FALSE;
|
|
}
|
|
/* The log record header length must be a multiple of 8. */
|
|
if (((le16_to_cpu(ra->log_record_header_length) + 7) & ~7) !=
|
|
le16_to_cpu(ra->log_record_header_length)) {
|
|
ntfs_error(vi->i_sb, "$LogFile restart area specifies "
|
|
"inconsistent log record header length.");
|
|
return FALSE;
|
|
}
|
|
/* Dito for the log page data offset. */
|
|
if (((le16_to_cpu(ra->log_page_data_offset) + 7) & ~7) !=
|
|
le16_to_cpu(ra->log_page_data_offset)) {
|
|
ntfs_error(vi->i_sb, "$LogFile restart area specifies "
|
|
"inconsistent log page data offset.");
|
|
return FALSE;
|
|
}
|
|
ntfs_debug("Done.");
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* ntfs_check_log_client_array - check the log client array for consistency
|
|
* @vi: $LogFile inode to which the restart page belongs
|
|
* @rp: restart page whose log client array to check
|
|
*
|
|
* Check the log client array of the restart page @rp for consistency and
|
|
* return TRUE if it is consistent and FALSE otherwise.
|
|
*
|
|
* 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
|
|
* 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.
|
|
*/
|
|
static BOOL ntfs_check_log_client_array(struct inode *vi,
|
|
RESTART_PAGE_HEADER *rp)
|
|
{
|
|
RESTART_AREA *ra;
|
|
LOG_CLIENT_RECORD *ca, *cr;
|
|
u16 nr_clients, idx;
|
|
BOOL in_free_list, idx_is_first;
|
|
|
|
ntfs_debug("Entering.");
|
|
ra = (RESTART_AREA*)((u8*)rp + le16_to_cpu(rp->restart_area_offset));
|
|
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_debug("Done.");
|
|
return TRUE;
|
|
err_out:
|
|
ntfs_error(vi->i_sb, "$LogFile log client array is corrupt.");
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* ntfs_check_and_load_restart_page - check the restart page for consistency
|
|
* @vi: $LogFile inode to which the restart page belongs
|
|
* @rp: restart page to check
|
|
* @pos: position in @vi at which the restart page resides
|
|
* @wrp: copy of the multi sector transfer deprotected restart page
|
|
*
|
|
* Check the restart page @rp for consistency and return TRUE if it is
|
|
* consistent and FALSE otherwise.
|
|
*
|
|
* 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.
|
|
*/
|
|
static BOOL ntfs_check_and_load_restart_page(struct inode *vi,
|
|
RESTART_PAGE_HEADER *rp, s64 pos, RESTART_PAGE_HEADER **wrp)
|
|
{
|
|
RESTART_AREA *ra;
|
|
RESTART_PAGE_HEADER *trp;
|
|
int size;
|
|
BOOL ret;
|
|
|
|
ntfs_debug("Entering.");
|
|
/* Check the restart page header for consistency. */
|
|
if (!ntfs_check_restart_page_header(vi, rp, pos)) {
|
|
/* Error output already done inside the function. */
|
|
return FALSE;
|
|
}
|
|
/* Check the restart area for consistency. */
|
|
if (!ntfs_check_restart_area(vi, rp)) {
|
|
/* Error output already done inside the function. */
|
|
return FALSE;
|
|
}
|
|
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_nofs(le32_to_cpu(rp->system_page_size));
|
|
if (!trp) {
|
|
ntfs_error(vi->i_sb, "Failed to allocate memory for $LogFile "
|
|
"restart page buffer.");
|
|
return FALSE;
|
|
}
|
|
/*
|
|
* Read the whole of the restart page into the buffer. If it fits
|
|
* completely inside @rp, just copy it from there. Otherwise map all
|
|
* the required pages and copy the data from them.
|
|
*/
|
|
size = PAGE_CACHE_SIZE - (pos & ~PAGE_CACHE_MASK);
|
|
if (size >= le32_to_cpu(rp->system_page_size)) {
|
|
memcpy(trp, rp, le32_to_cpu(rp->system_page_size));
|
|
} else {
|
|
pgoff_t idx;
|
|
struct page *page;
|
|
int have_read, to_read;
|
|
|
|
/* First copy what we already have in @rp. */
|
|
memcpy(trp, rp, size);
|
|
/* Copy the remaining data one page at a time. */
|
|
have_read = size;
|
|
to_read = le32_to_cpu(rp->system_page_size) - size;
|
|
idx = (pos + size) >> PAGE_CACHE_SHIFT;
|
|
BUG_ON((pos + size) & ~PAGE_CACHE_MASK);
|
|
do {
|
|
page = ntfs_map_page(vi->i_mapping, idx);
|
|
if (IS_ERR(page)) {
|
|
ntfs_error(vi->i_sb, "Error mapping $LogFile "
|
|
"page (index %lu).", idx);
|
|
goto err_out;
|
|
}
|
|
size = min_t(int, to_read, PAGE_CACHE_SIZE);
|
|
memcpy((u8*)trp + have_read, page_address(page), size);
|
|
ntfs_unmap_page(page);
|
|
have_read += size;
|
|
to_read -= size;
|
|
idx++;
|
|
} while (to_read > 0);
|
|
}
|
|
/* Perform the multi sector transfer deprotection on the buffer. */
|
|
if (post_read_mst_fixup((NTFS_RECORD*)trp,
|
|
le32_to_cpu(rp->system_page_size))) {
|
|
ntfs_error(vi->i_sb, "Multi sector transfer error detected in "
|
|
"$LogFile restart page.");
|
|
goto err_out;
|
|
}
|
|
/* Check the log client records for consistency. */
|
|
ret = ntfs_check_log_client_array(vi, trp);
|
|
if (ret && wrp)
|
|
*wrp = trp;
|
|
else
|
|
ntfs_free(trp);
|
|
ntfs_debug("Done.");
|
|
return ret;
|
|
err_out:
|
|
ntfs_free(trp);
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* ntfs_ckeck_logfile - check in the journal if the volume is consistent
|
|
* @log_vi: struct inode of loaded journal $LogFile to check
|
|
*
|
|
* Check the $LogFile journal for consistency and return TRUE if it is
|
|
* consistent and FALSE if not.
|
|
*
|
|
* 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(struct inode *log_vi)
|
|
{
|
|
s64 size, pos, rstr1_pos, rstr2_pos;
|
|
ntfs_volume *vol = NTFS_SB(log_vi->i_sb);
|
|
struct address_space *mapping = log_vi->i_mapping;
|
|
struct page *page = NULL;
|
|
u8 *kaddr = NULL;
|
|
RESTART_PAGE_HEADER *rstr1_ph = NULL;
|
|
RESTART_PAGE_HEADER *rstr2_ph = NULL;
|
|
int log_page_size, log_page_mask, ofs;
|
|
BOOL logfile_is_empty = TRUE;
|
|
BOOL rstr1_found = FALSE;
|
|
BOOL rstr2_found = FALSE;
|
|
u8 log_page_bits;
|
|
|
|
ntfs_debug("Entering.");
|
|
/* An empty $LogFile must have been clean before it got emptied. */
|
|
if (NVolLogFileEmpty(vol))
|
|
goto is_empty;
|
|
size = log_vi->i_size;
|
|
/* Make sure the file doesn't exceed the maximum allowed size. */
|
|
if (size > MaxLogFileSize)
|
|
size = MaxLogFileSize;
|
|
/*
|
|
* Truncate size to a multiple of the page cache size or the default
|
|
* log page size if the page cache size is between the default log page
|
|
* log page size if the page cache size is between the default log page
|
|
* size and twice that.
|
|
*/
|
|
if (PAGE_CACHE_SIZE >= DefaultLogPageSize && PAGE_CACHE_SIZE <=
|
|
DefaultLogPageSize * 2)
|
|
log_page_size = DefaultLogPageSize;
|
|
else
|
|
log_page_size = PAGE_CACHE_SIZE;
|
|
log_page_mask = log_page_size - 1;
|
|
/*
|
|
* Use generic_ffs() instead of ffs() to enable the compiler to
|
|
* optimize log_page_size and log_page_bits into constants.
|
|
*/
|
|
log_page_bits = generic_ffs(log_page_size) - 1;
|
|
size &= ~(log_page_size - 1);
|
|
/*
|
|
* Ensure the log file is big enough to store at least the two restart
|
|
* pages and the minimum number of log record pages.
|
|
*/
|
|
if (size < log_page_size * 2 || (size - log_page_size * 2) >>
|
|
log_page_bits < MinLogRecordPages) {
|
|
ntfs_error(vol->sb, "$LogFile is too small.");
|
|
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 uninitialzed records, the log file can be assumed
|
|
* to be empty.
|
|
*/
|
|
for (pos = 0; pos < size; pos <<= 1) {
|
|
pgoff_t idx = pos >> PAGE_CACHE_SHIFT;
|
|
if (!page || page->index != idx) {
|
|
if (page)
|
|
ntfs_unmap_page(page);
|
|
page = ntfs_map_page(mapping, idx);
|
|
if (IS_ERR(page)) {
|
|
ntfs_error(vol->sb, "Error mapping $LogFile "
|
|
"page (index %lu).", idx);
|
|
return FALSE;
|
|
}
|
|
}
|
|
kaddr = (u8*)page_address(page) + (pos & ~PAGE_CACHE_MASK);
|
|
/*
|
|
* A non-empty block means the logfile is not empty while an
|
|
* empty block after a non-empty block has been encountered
|
|
* means we are done.
|
|
*/
|
|
if (!ntfs_is_empty_recordp((le32*)kaddr))
|
|
logfile_is_empty = FALSE;
|
|
else if (!logfile_is_empty)
|
|
break;
|
|
/*
|
|
* A log record page means there cannot be a restart page after
|
|
* this so no need to continue searching.
|
|
*/
|
|
if (ntfs_is_rcrd_recordp((le32*)kaddr))
|
|
break;
|
|
/*
|
|
* A modified by chkdsk restart page means we cannot handle
|
|
* this log file.
|
|
*/
|
|
if (ntfs_is_chkd_recordp((le32*)kaddr)) {
|
|
ntfs_error(vol->sb, "$LogFile has been modified by "
|
|
"chkdsk. Mount this volume in "
|
|
"Windows.");
|
|
goto err_out;
|
|
}
|
|
/* If not a restart page, continue. */
|
|
if (!ntfs_is_rstr_recordp((le32*)kaddr)) {
|
|
/* Skip to the minimum page size for the next one. */
|
|
if (!pos)
|
|
pos = NTFS_BLOCK_SIZE >> 1;
|
|
continue;
|
|
}
|
|
/* We now know we have a restart page. */
|
|
if (!pos) {
|
|
rstr1_found = TRUE;
|
|
rstr1_pos = pos;
|
|
} else {
|
|
if (rstr2_found) {
|
|
ntfs_error(vol->sb, "Found more than two "
|
|
"restart pages in $LogFile.");
|
|
goto err_out;
|
|
}
|
|
rstr2_found = TRUE;
|
|
rstr2_pos = pos;
|
|
}
|
|
/*
|
|
* Check the restart page for consistency and get a copy of the
|
|
* complete multi sector transfer deprotected restart page.
|
|
*/
|
|
if (!ntfs_check_and_load_restart_page(log_vi,
|
|
(RESTART_PAGE_HEADER*)kaddr, pos,
|
|
!pos ? &rstr1_ph : &rstr2_ph)) {
|
|
/* Error output already done inside the function. */
|
|
goto err_out;
|
|
}
|
|
/*
|
|
* We have a valid restart page. The next one must be after
|
|
* a whole system page size as specified by the valid restart
|
|
* page.
|
|
*/
|
|
if (!pos)
|
|
pos = le32_to_cpu(rstr1_ph->system_page_size) >> 1;
|
|
}
|
|
if (page) {
|
|
ntfs_unmap_page(page);
|
|
page = NULL;
|
|
}
|
|
if (logfile_is_empty) {
|
|
NVolSetLogFileEmpty(vol);
|
|
is_empty:
|
|
ntfs_debug("Done. ($LogFile is empty.)");
|
|
return TRUE;
|
|
}
|
|
if (!rstr1_found || !rstr2_found) {
|
|
ntfs_error(vol->sb, "Did not find two restart pages in "
|
|
"$LogFile.");
|
|
goto err_out;
|
|
}
|
|
/*
|
|
* The two restart areas must be identical except for the update
|
|
* sequence number.
|
|
*/
|
|
ofs = le16_to_cpu(rstr1_ph->usa_ofs);
|
|
if (memcmp(rstr1_ph, rstr2_ph, ofs) || (ofs += sizeof(u16),
|
|
memcmp((u8*)rstr1_ph + ofs, (u8*)rstr2_ph + ofs,
|
|
le32_to_cpu(rstr1_ph->system_page_size) - ofs))) {
|
|
ntfs_error(vol->sb, "The two restart pages in $LogFile do not "
|
|
"match.");
|
|
goto err_out;
|
|
}
|
|
ntfs_free(rstr1_ph);
|
|
ntfs_free(rstr2_ph);
|
|
/* All consistency checks passed. */
|
|
ntfs_debug("Done.");
|
|
return TRUE;
|
|
err_out:
|
|
if (page)
|
|
ntfs_unmap_page(page);
|
|
if (rstr1_ph)
|
|
ntfs_free(rstr1_ph);
|
|
if (rstr2_ph)
|
|
ntfs_free(rstr2_ph);
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* ntfs_is_logfile_clean - check in the journal if the volume is clean
|
|
* @log_vi: struct inode of loaded journal $LogFile to check
|
|
*
|
|
* 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 preceeding 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(struct inode *log_vi)
|
|
{
|
|
ntfs_volume *vol = NTFS_SB(log_vi->i_sb);
|
|
struct page *page;
|
|
RESTART_PAGE_HEADER *rp;
|
|
RESTART_AREA *ra;
|
|
|
|
ntfs_debug("Entering.");
|
|
/* An empty $LogFile must have been clean before it got emptied. */
|
|
if (NVolLogFileEmpty(vol)) {
|
|
ntfs_debug("Done. ($LogFile is empty.)");
|
|
return TRUE;
|
|
}
|
|
/*
|
|
* Read the first restart page. It will be possibly incomplete and
|
|
* will not be multi sector transfer deprotected but we only need the
|
|
* first NTFS_BLOCK_SIZE bytes so it does not matter.
|
|
*/
|
|
page = ntfs_map_page(log_vi->i_mapping, 0);
|
|
if (IS_ERR(page)) {
|
|
ntfs_error(vol->sb, "Error mapping $LogFile page (index 0).");
|
|
return FALSE;
|
|
}
|
|
rp = (RESTART_PAGE_HEADER*)page_address(page);
|
|
if (!ntfs_is_rstr_record(rp->magic)) {
|
|
ntfs_error(vol->sb, "No restart page found at offset zero in "
|
|
"$LogFile. This is probably a bug in that "
|
|
"the $LogFile should have been consistency "
|
|
"checked before calling this function.");
|
|
goto err_out;
|
|
}
|
|
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_debug("Done. $LogFile indicates a dirty shutdown.");
|
|
goto err_out;
|
|
}
|
|
ntfs_unmap_page(page);
|
|
/* $LogFile indicates a clean shutdown. */
|
|
ntfs_debug("Done. $LogFile indicates a clean shutdown.");
|
|
return TRUE;
|
|
err_out:
|
|
ntfs_unmap_page(page);
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* ntfs_empty_logfile - empty the contents of the $LogFile journal
|
|
* @log_vi: struct inode of loaded journal $LogFile to empty
|
|
*
|
|
* Empty the contents of the $LogFile journal @log_vi and return TRUE on
|
|
* success and FALSE 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.
|
|
*/
|
|
BOOL ntfs_empty_logfile(struct inode *log_vi)
|
|
{
|
|
ntfs_volume *vol = NTFS_SB(log_vi->i_sb);
|
|
|
|
ntfs_debug("Entering.");
|
|
if (!NVolLogFileEmpty(vol)) {
|
|
int err;
|
|
|
|
err = ntfs_attr_set(NTFS_I(log_vi), 0, log_vi->i_size, 0xff);
|
|
if (unlikely(err)) {
|
|
ntfs_error(vol->sb, "Failed to fill $LogFile with "
|
|
"0xff bytes (error code %i).", err);
|
|
return FALSE;
|
|
}
|
|
/* Set the flag so we do not have to do it again on remount. */
|
|
NVolSetLogFileEmpty(vol);
|
|
}
|
|
ntfs_debug("Done.");
|
|
return TRUE;
|
|
}
|
|
|
|
#endif /* NTFS_RW */
|