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ntfsprogs/ntfsprogs/ntfsck.c
3e8c1d1 Jan 20, 2011
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867 lines (747 sloc) 26.8 KB
/**
* ntfsck - Part of the Linux-NTFS project.
*
* Copyright (c) 2006 Yuval Fledel
*
* This utility will check and fix errors on an NTFS volume.
*
* This program 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 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
*/
#include "config.h"
#ifdef HAVE_STDIO_H
#include <stdio.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include "layout.h"
#include "cluster.h"
#include "bitmap.h"
#include "utils.h"
#include "endians.h"
#include "bootsect.h"
#define RETURN_FS_ERRORS_CORRECTED (1)
#define RETURN_SYSTEM_NEEDS_REBOOT (2)
#define RETURN_FS_ERRORS_LEFT_UNCORRECTED (4)
#define RETURN_OPERATIONAL_ERROR (8)
#define RETURN_USAGE_OR_SYNTAX_ERROR (16)
#define RETURN_CANCELLED_BY_USER (32)
/* Where did 64 go? */
#define RETURN_SHARED_LIBRARY_ERROR (128)
/* todo: command line: (everything is optional)
* fsck-frontend options:
* -C [fd] : display progress bar (send it to the file descriptor if specified)
* -T : don't show the title on startup
* fsck-checker options:
* -a : auto-repair. no questions. (optional: if marked clean and -f not specified, just check if mounable)
* -p : auto-repair safe. no questions (optional: same)
* -n : only check. no repair.
* -r : interactively repair.
* -y : always yes.
* -v : verbose.
* -V : version.
* taken from fsck.ext2
* -b sb : use the superblock from sb. For corrupted volumes. (do we want separete boot/mft options?)
* -c : use badblocks(8) to find bad blocks (R/O mode) and add the findings to $Bad.
* -C fd : write competion info to fd. If 0, print a completion bar.
* -d : debugging output.
* -D : rebalance indices.
* -f : force checking even if marked clean.
* -F : flush buffers before beginning. (for time-benchmarking)
* -k : When used with -c, don't erase previous $Bad items.
* -n : Open fs as readonly. assume always no. (why is it needed if -r is not specified?)
* -t : Print time statistics.
* taken from fsck.reiserfs
* --rebuild-sb : try to find $MFT start and rebuild the boot sector.
* --rebuild-tree : scan for items and rebuild the indices that point to them (0x30, $SDS, etc.)
* --clean-reserved: zero rezerved fields. (use with care!)
* --adjust-size -z: insert a sparse hole if the data_size is larger than the size marked in the runlist.
* --logfile file : report corruptions (unlike other errors) to a file instead of stderr.
* --nolog : don't report corruptions at all.
* --quiet -q : no progress bar.
* taken from fsck.msdos
* -w : flush after every write.
* - do n passes. (only 2 in fsck.msdos. second should not report errors. Bonus: stop when error list does not change)
* taken from fsck.jfs
* --omit-journal-reply: self-descriptive (why would someone do that?)
* --replay-journal-only: self-descriptive. don't check otherwise.
* taken from fsck.xfs
* -s : only serious errors should be reported.
* -i ino : verbose behaviour only for inode ino.
* -b bno : verbose behaviour only for cluster bno.
* -L : zero log.
* inspired by others
* - don't do cluster accounting.
* - don't do mft record accounting.
* - don't do file names accounting.
* - don't do security_id accounting.
* - don't check acl inheritance problems.
* - undelete unused mft records. (bonus: different options for 100% salvagable and less)
* - error-level-report n: only report errors above this error level
* - error-level-repair n: only repair errors below this error level
* - don't fail on ntfsclone metadata pruning.
* signals:
* SIGUSR1 : start displaying progress bar
* SIGUSR2 : stop displaying progress bar.
*/
/* Assuming NO_NTFS_DEVICE_DEFAULT_IO_OPS is not set */
static int errors = 0;
static int unsupported = 0;
static short bytes_per_sector, sectors_per_cluster;
//static s64 mft_offset, mftmirr_offset;
static s64 current_mft_record;
/**
* This is just a preliminary volume.
* Filled while checking the boot sector and used in the preliminary MFT check.
*/
static ntfs_volume vol;
static runlist_element *mft_rl, *mft_bitmap_rl;
#define check_failed(FORMAT, ARGS...) \
do { \
errors++; \
ntfs_log_redirect(__FUNCTION__,__FILE__,__LINE__, \
NTFS_LOG_LEVEL_ERROR,NULL,FORMAT,##ARGS); \
} while (0);
/**
* 0 success.
* 1 fail.
*/
static int assert_u32_equal(u32 val, u32 ok, const char *name)
{
if (val!=ok) {
check_failed("Assertion failed for '%lld:%s'. should be 0x%x, "
"was 0x%x.\n", current_mft_record, name,
(int)ok, (int)val);
//errors++;
return 1;
}
return 0;
}
static int assert_u32_noteq(u32 val, u32 wrong, const char *name)
{
if (val==wrong) {
check_failed("Assertion failed for '%lld:%s'. should not be "
"0x%x.\n", current_mft_record, name, (int)wrong);
return 1;
}
return 0;
}
static int assert_u32_lesseq(u32 val1, u32 val2, const char *name)
{
if (val1 > val2) {
check_failed("Assertion failed for '%s'. 0x%x > 0x%x\n",
name, (int)val1, (int)val2);
//errors++;
return 1;
}
return 0;
}
static int assert_u32_less(u32 val1, u32 val2, const char *name)
{
if (val1 >= val2) {
check_failed("Assertion failed for '%s'. 0x%x >= 0x%x\n",
name, (int)val1, (int)val2);
//errors++;
return 1;
}
return 0;
}
/**
* Return: 0 ok, 1 error.
*
* todo: may we use ntfs_boot_sector_is_ntfs() instead?
* It already does the checks but will not be able to fix anything.
*/
static BOOL verify_boot_sector(struct ntfs_device *dev)
{
u8 buf[512];
NTFS_BOOT_SECTOR *ntfs_boot = (NTFS_BOOT_SECTOR *)&buf;
//u32 bytes_per_cluster;
current_mft_record = 9;
if (dev->d_ops->pread(dev, buf, sizeof(buf), 0)!=sizeof(buf)) {
check_failed("Failed to read boot sector.\n");
return 1;
}
if ((buf[0]!=0xeb) ||
((buf[1]!=0x52) && (buf[1]!=0x5b)) ||
(buf[2]!=0x90)) {
check_failed("Boot sector: Bad jump.\n");
}
if (ntfs_boot->oem_id != NTFS_SB_MAGIC) {
check_failed("Boot sector: Bad NTFS magic.\n");
}
bytes_per_sector = le16_to_cpu(ntfs_boot->bpb.bytes_per_sector);
if (!bytes_per_sector) {
check_failed("Boot sector: Bytes per sector is 0.\n");
}
if (bytes_per_sector%512) {
check_failed("Boot sector: Bytes per sector is not a multiple"
" of 512.\n");
}
sectors_per_cluster = ntfs_boot->bpb.sectors_per_cluster;
// todo: if partition, query bios and match heads/tracks? */
// Initialize some values from vol. We will need those later.
ntfs_boot_sector_parse(&vol, (NTFS_BOOT_SECTOR *)buf);
vol.dev = dev;
return 0;
}
/**
* Load the runlist of the <attr_type> attribute.
*
* Return NULL if an error.
* The caller is responsible on freeing the allocated memory if the result is not NULL.
*
* Set size_of_file_record to some reasonable size when in doubt (the Windows default is 1024.)
*
* attr_type must be little endian.
*
* This function has code duplication with check_file_record() and
* check_attr_record() but its goal is to be less strict. Thus the
* duplicated checks are the minimal required for not crashing.
*
* Assumes dev is open.
*/
static runlist *load_runlist(struct ntfs_device *dev, s64 offset_to_file_record, u32 attr_type, u32 size_of_file_record)
{
u8 *buf;
u16 attrs_offset;
u32 length;
ATTR_RECORD *attr_rec;
if (size_of_file_record<22) // offset to attrs_offset
return NULL;
buf = (u8*)ntfs_malloc(size_of_file_record);
if (!buf)
return NULL;
if (dev->d_ops->pread(dev, buf, size_of_file_record, offset_to_file_record)!=size_of_file_record) {
check_failed("Failed to read file record at offset %lld (0x%llx).\n", offset_to_file_record, offset_to_file_record);
return NULL;
}
attrs_offset = le16_to_cpu(((MFT_RECORD*)buf)->attrs_offset);
// first attribute must be after the header.
if (attrs_offset<42) {
check_failed("First attribute must be after the header (%u).\n", (int)attrs_offset);
}
attr_rec = (ATTR_RECORD *)(buf + attrs_offset);
//printf("uv1.\n");
while ((u8*)attr_rec<=buf+size_of_file_record-4) {
//printf("Attr type: 0x%x.\n", attr_rec->type);
// Check attribute record. (Only what is in the buffer)
if (attr_rec->type==AT_END) {
check_failed("Attribute 0x%x not found in file record at offset %lld (0x%llx).\n", (int)le32_to_cpu(attr_rec->type), offset_to_file_record, offset_to_file_record);
return NULL;
}
if ((u8*)attr_rec>buf+size_of_file_record-8) {
// not AT_END yet no room for the length field.
check_failed("Attribute 0x%x is not AT_END, yet no "
"room for the length field.\n",
(int)le32_to_cpu(attr_rec->type));
return NULL;
}
length = le32_to_cpu(attr_rec->length);
// Check that this attribute does not overflow the mft_record
if ((u8*)attr_rec+length >= buf+size_of_file_record) {
check_failed("Attribute (0x%x) is larger than FILE record at offset %lld (0x%llx).\n",
(int)le32_to_cpu(attr_rec->type), offset_to_file_record, offset_to_file_record);
return NULL;
}
// todo: what ATTRIBUTE_LIST (0x20)?
if (attr_rec->type==attr_type) {
// Eurika!
// ntfs_mapping_pairs_decompress only use two values from vol. Just fake it.
// todo: it will also use vol->major_ver if defined(DEBUG). But only for printing purposes.
// Assume ntfs_boot_sector_parse() was called.
return ntfs_mapping_pairs_decompress(&vol, attr_rec, NULL);
}
attr_rec = (ATTR_RECORD*)((u8*)attr_rec+length);
}
// If we got here, there was an overflow.
check_failed("file record corrupted at offset %lld (0x%llx).\n", offset_to_file_record, offset_to_file_record);
return NULL;
}
/**
* Return: >=0 last VCN
* LCN_EINVAL error.
*/
static VCN get_last_vcn(runlist *rl)
{
VCN res;
if (!rl)
return LCN_EINVAL;
res = LCN_EINVAL;
while (rl->length) {
ntfs_log_verbose("vcn: %lld, length: %lld.\n", rl->vcn,
rl->length);
if (rl->vcn<0)
res = rl->vcn;
else
res = rl->vcn + rl->length;
rl++;
}
return res;
}
static u32 mft_bitmap_records;
static u8 *mft_bitmap_buf;
/**
* Assumes mft_bitmap_rl is initialized.
* return: 0 ok.
* RETURN_OPERATIONAL_ERROR on error.
*/
static int mft_bitmap_load(struct ntfs_device *dev)
{
VCN vcn;
u32 mft_bitmap_length;
vcn = get_last_vcn(mft_bitmap_rl);
if (vcn<=LCN_EINVAL) {
mft_bitmap_buf = NULL;
/* This case should not happen, not even with on-disk errors */
goto error;
}
mft_bitmap_length = vcn * vol.cluster_size;
mft_bitmap_records = 8 * mft_bitmap_length * vol.cluster_size /
vol.mft_record_size;
//printf("sizes: %d, %d.\n", mft_bitmap_length, mft_bitmap_records);
mft_bitmap_buf = (u8*)ntfs_malloc(mft_bitmap_length);
if (!mft_bitmap_buf)
goto error;
if (ntfs_rl_pread(&vol, mft_bitmap_rl, 0, mft_bitmap_length,
mft_bitmap_buf)!=mft_bitmap_length)
goto error;
return 0;
error:
mft_bitmap_records = 0;
ntfs_log_error("Could not load $MFT/Bitmap.\n");
return RETURN_OPERATIONAL_ERROR;
}
/**
* -1 Error.
* 0 Unused record
* 1 Used record
*
* Assumes mft_bitmap_rl was initialized.
*/
static int mft_bitmap_get_bit(s64 mft_no)
{
if (mft_no>=mft_bitmap_records)
return -1;
return ntfs_bit_get(mft_bitmap_buf, mft_no);
}
/**
* @attr_rec: The attribute record to check
* @mft_rec: The parent FILE record.
* @buflen: The size of the FILE record.
*
* Return:
* NULL: Fatal error occured. Not sure where is the next record.
* otherwise: pointer to the next attribute record.
*
* The function only check fields that are inside this attr record.
*
* Assumes mft_rec is current_mft_record.
*/
static ATTR_REC *check_attr_record(ATTR_REC *attr_rec, MFT_RECORD *mft_rec,
u16 buflen)
{
u16 name_offset;
u16 attrs_offset = le16_to_cpu(mft_rec->attrs_offset);
u32 attr_type = le32_to_cpu(attr_rec->type);
u32 length = le32_to_cpu(attr_rec->length);
// Check that this attribute does not overflow the mft_record
if ((u8*)attr_rec+length >= ((u8*)mft_rec)+buflen) {
check_failed("Attribute (0x%x) is larger than FILE record (%lld).\n",
(int)attr_type, current_mft_record);
return NULL;
}
// Attr type must be a multiple of 0x10 and 0x10<=x<=0x100.
if ((attr_type & ~0x0F0) && (attr_type != 0x100)) {
check_failed("Unknown attribute type 0x%x.\n",
(int)attr_type);
goto check_attr_record_next_attr;
}
if (length<24) {
check_failed("Attribute %lld:0x%x Length too short (%u).\n",
current_mft_record, (int)attr_type, (int)length);
goto check_attr_record_next_attr;
}
// If this is the first attribute:
// todo: instance number must be smaller than next_instance.
if ((u8*)attr_rec == ((u8*)mft_rec) + attrs_offset) {
if (!mft_rec->base_mft_record)
assert_u32_equal(attr_type, 0x10,
"First attribute type");
// The following not always holds.
// attr 0x10 becomes instance 1 and attr 0x40 becomes 0.
//assert_u32_equal(attr_rec->instance, 0,
// "First attribute instance number");
} else {
assert_u32_noteq(attr_type, 0x10,
"Not-first attribute type");
// The following not always holds.
//assert_u32_noteq(attr_rec->instance, 0,
// "Not-first attribute instance number");
}
//if (current_mft_record==938 || current_mft_record==1683 || current_mft_record==3152 || current_mft_record==22410)
//printf("Attribute %lld:0x%x instance: %u isbase:%d.\n",
// current_mft_record, (int)attr_type, (int)le16_to_cpu(attr_rec->instance), (int)mft_rec->base_mft_record);
// todo: instance is unique.
// Check flags.
if (attr_rec->flags & ~(const_cpu_to_le16(0xc0ff))) {
check_failed("Attribute %lld:0x%x Unknown flags (0x%x).\n",
current_mft_record, (int)attr_type,
(int)le16_to_cpu(attr_rec->flags));
}
if (attr_rec->non_resident>1) {
check_failed("Attribute %lld:0x%x Unknown non-resident "
"flag (0x%x).\n", current_mft_record,
(int)attr_type, (int)attr_rec->non_resident);
goto check_attr_record_next_attr;
}
name_offset = le16_to_cpu(attr_rec->name_offset);
/*
* todo: name must be legal unicode.
* Not really, information below in urls is about filenames, but I
* believe it also applies to attribute names. (Yura)
* http://blogs.msdn.com/michkap/archive/2006/09/24/769540.aspx
* http://blogs.msdn.com/michkap/archive/2006/09/10/748699.aspx
*/
if (attr_rec->non_resident) {
// Non-Resident
// Make sure all the fields exist.
if (length<64) {
check_failed("Non-resident attribute %lld:0x%x too short (%u).\n",
current_mft_record, (int)attr_type, (int)length);
goto check_attr_record_next_attr;
}
if (attr_rec->compression_unit && (length<72)) {
check_failed("Compressed attribute %lld:0x%x too short (%u).\n",
current_mft_record, (int)attr_type, (int)length);
goto check_attr_record_next_attr;
}
// todo: name comes before mapping pairs, and after the header.
// todo: length==mapping_pairs_offset+length of compressed mapping pairs.
// todo: mapping_pairs_offset is 8-byte aligned.
// todo: lowest vcn <= highest_vcn
// todo: if base record -> lowest vcn==0
// todo: lowest_vcn!=0 -> attribute list is used.
// todo: lowest_vcn & highest_vcn are in the drive (0<=x<total clusters)
// todo: mapping pairs agree with highest_vcn.
// todo: compression unit == 0 or 4.
// todo: reserved1 == 0.
// todo: if not compressed nor sparse, initialized_size <= allocated_size and data_size <= allocated_size.
// todo: if compressed or sparse, allocated_size <= initialized_size and allocated_size <= data_size
// todo: if mft_no!=0 and not compressed/sparse, data_size==initialized_size.
// todo: if mft_no!=0 and compressed/sparse, allocated_size==initialized_size.
// todo: what about compressed_size if compressed?
// todo: attribute must not be 0x10, 0x30, 0x40, 0x60, 0x70, 0x90, 0xd0 (not sure about 0xb0, 0xe0, 0xf0)
} else {
u16 value_offset = le16_to_cpu(attr_rec->value_offset);
u32 value_length = le32_to_cpu(attr_rec->value_length);
// Resident
if (attr_rec->name_length) {
if (name_offset < 24)
check_failed("Resident attribute with "
"name intersecting header.\n");
if (value_offset < name_offset +
attr_rec->name_length)
check_failed("Named resident attribute "
"with value before name.\n");
}
// if resident, length==value_length+value_offset
//assert_u32_equal(le32_to_cpu(attr_rec->value_length)+
// value_offset, length,
// "length==value_length+value_offset");
// if resident, length==value_length+value_offset
if (value_length+value_offset > length) {
check_failed("value_length(%d)+value_offset(%d)>length(%d) for attribute 0x%x.\n", (int)value_length, (int)value_offset, (int)length, (int)attr_type);
return NULL;
}
// Check resident_flags.
if (attr_rec->resident_flags>0x01) {
check_failed("Unknown resident flags (0x%x) for attribute 0x%x.\n", (int)attr_rec->resident_flags, (int)attr_type);
} else if (attr_rec->resident_flags && (attr_type!=0x30)) {
check_failed("Resident flags mark attribute 0x%x as indexed.\n", (int)attr_type);
}
// reservedR is 0.
assert_u32_equal(attr_rec->reservedR, 0, "Resident Reserved");
// todo: attribute must not be 0xa0 (not sure about 0xb0, 0xe0, 0xf0)
// todo: check content well-formness per attr_type.
}
return 0;
check_attr_record_next_attr:
return (ATTR_REC *)(((u8 *)attr_rec) + length);
}
/**
* All checks that can be satisfied only by data from the buffer.
* No other [MFT records/metadata files] are required.
*
* The buffer is changed by removing the Update Sequence.
*
* Return:
* 0 Everything's cool.
* else Consider this record as damaged.
*/
static BOOL check_file_record(u8 *buffer, u16 buflen)
{
u16 usa_count, usa_ofs, attrs_offset, usa;
u32 bytes_in_use, bytes_allocated, i;
MFT_RECORD *mft_rec = (MFT_RECORD *)buffer;
ATTR_REC *attr_rec;
// check record magic
assert_u32_equal(mft_rec->magic, magic_FILE, "FILE record magic");
// todo: records 16-23 must be filled in order.
// todo: what to do with magic_BAAD?
// check usa_count+offset to update seq <= attrs_offset <
// bytes_in_use <= bytes_allocated <= buflen.
usa_ofs = le16_to_cpu(mft_rec->usa_ofs);
usa_count = le16_to_cpu(mft_rec->usa_count);
attrs_offset = le16_to_cpu(mft_rec->attrs_offset);
bytes_in_use = le32_to_cpu(mft_rec->bytes_in_use);
bytes_allocated = le32_to_cpu(mft_rec->bytes_allocated);
if (assert_u32_lesseq(usa_ofs+usa_count, attrs_offset,
"usa_ofs+usa_count <= attrs_offset") ||
assert_u32_less(attrs_offset, bytes_in_use,
"attrs_offset < bytes_in_use") ||
assert_u32_lesseq(bytes_in_use, bytes_allocated,
"bytes_in_use <= bytes_allocated") ||
assert_u32_lesseq(bytes_allocated, buflen,
"bytes_allocated <= max_record_size")) {
return 1;
}
// We should know all the flags.
if (mft_rec->flags>0xf) {
check_failed("Unknown MFT record flags (0x%x).\n",
(unsigned int)mft_rec->flags);
}
// todo: flag in_use must be on.
// Remove update seq & check it.
usa = *(u16*)(buffer+usa_ofs); // The value that should be at the end of every sector.
assert_u32_equal(usa_count-1, buflen/bytes_per_sector, "USA length");
for (i=1;i<usa_count;i++) {
u16 *fixup = (u16*)(buffer+bytes_per_sector*i-2); // the value at the end of the sector.
u16 saved_val = *(u16*)(buffer+usa_ofs+2*i); // the actual data value that was saved in the us array.
assert_u32_equal(*fixup, usa, "fixup");
*fixup = saved_val; // remove it.
}
attr_rec = (ATTR_REC *)(buffer + attrs_offset);
while ((u8*)attr_rec<=buffer+buflen-4) {
// Check attribute record. (Only what is in the buffer)
if (attr_rec->type==AT_END) {
// Done.
return 0;
}
if ((u8*)attr_rec>buffer+buflen-8) {
// not AT_END yet no room for the length field.
check_failed("Attribute 0x%x is not AT_END, yet no "
"room for the length field.\n",
(int)le32_to_cpu(attr_rec->type));
return 1;
}
attr_rec = check_attr_record(attr_rec, mft_rec, buflen);
if (!attr_rec)
return 1;
}
// If we got here, there was an overflow.
return 1;
// todo: an attribute should be at the offset to first attribute, and the offset should be inside the buffer. It should have the value of "next attribute id".
// todo: if base record, it should start with attribute 0x10.
// Highlevel check of attributes.
// todo: Attributes are well-formed.
// todo: Room for next attribute in the end of the previous record.
return FALSE;
}
static void replay_log(ntfs_volume *vol)
{
// At this time, only check that the log is fully replayed.
ntfs_log_warning("Unsupported: replay_log()\n");
// todo: if logfile is clean, return success.
unsupported++;
}
static void verify_mft_record(ntfs_volume *vol, s64 mft_num)
{
u8 *buffer;
int is_used;
current_mft_record = mft_num;
is_used = mft_bitmap_get_bit(mft_num);
if (is_used<0) {
ntfs_log_error("Error getting bit value for record %lld.\n", mft_num);
} else if (!is_used) {
ntfs_log_verbose("Record %lld unused. Skipping.\n", mft_num);
return;
}
buffer = ntfs_malloc(vol->mft_record_size);
if (!buffer)
goto verify_mft_record_error;
ntfs_log_verbose("MFT record %lld\n", mft_num);
if (ntfs_attr_pread(vol->mft_na, mft_num*vol->mft_record_size, vol->mft_record_size, buffer) < 0) {
ntfs_log_perror("Couldn't read $MFT record %lld", mft_num);
goto verify_mft_record_error;
}
check_file_record(buffer, vol->mft_record_size);
// todo: if offset to first attribute >= 0x30, number of mft record should match.
// todo: Match the "record is used" with the mft bitmap.
// todo: if this is not base, check that the parent is a base, and is in use, and pointing to this record.
// todo: if base record: for each extent record:
// todo: verify_file_record
// todo: hard link count should be the number of 0x30 attributes.
// todo: Order of attributes.
// todo: make sure compression_unit is the same.
return;
verify_mft_record_error:
if (buffer)
free(buffer);
errors++;
}
/**
* This function serves as bootstraping for the more comprehensive checks.
* It will load the MFT runlist and MFT/Bitmap runlist.
* It should not depend on other checks or we may have a circular dependancy.
* Also, this loadng must be forgiving, unlike the comprehensive checks.
*/
static int verify_mft_preliminary(struct ntfs_device *dev)
{
current_mft_record = 0;
s64 mft_offset, mftmirr_offset;
int res;
ntfs_log_trace("Entering verify_mft_preliminary().\n");
// todo: get size_of_file_record from boot sector
// Load the first segment of the $MFT/DATA runlist.
mft_offset = vol.mft_lcn * vol.cluster_size;
mftmirr_offset = vol.mftmirr_lcn * vol.cluster_size;
mft_rl = load_runlist(dev, mft_offset, AT_DATA, 1024);
if (!mft_rl) {
check_failed("Loading $MFT runlist failed. Trying $MFTMirr.\n");
mft_rl = load_runlist(dev, mftmirr_offset, AT_DATA, 1024);
}
if (!mft_rl) {
check_failed("Loading $MFTMirr runlist failed too. Aborting.\n");
return RETURN_FS_ERRORS_LEFT_UNCORRECTED | RETURN_OPERATIONAL_ERROR;
}
// TODO: else { recover $MFT } // Use $MFTMirr to recover $MFT.
// todo: support loading the next runlist extents when ATTRIBUTE_LIST is used on $MFT.
// If attribute list: Gradually load mft runlist. (parse runlist from first file record, check all referenced file records, continue with the next file record). If no attribute list, just load it.
// Load the runlist of $MFT/Bitmap.
// todo: what about ATTRIBUTE_LIST? Can we reuse code?
mft_bitmap_rl = load_runlist(dev, mft_offset, AT_BITMAP, 1024);
if (!mft_bitmap_rl) {
check_failed("Loading $MFT/Bitmap runlist failed. Trying $MFTMirr.\n");
mft_bitmap_rl = load_runlist(dev, mftmirr_offset, AT_BITMAP, 1024);
}
if (!mft_bitmap_rl) {
check_failed("Loading $MFTMirr/Bitmap runlist failed too. Aborting.\n");
return RETURN_FS_ERRORS_LEFT_UNCORRECTED;
// todo: rebuild the bitmap by using the "in_use" file record flag or by filling it with 1's.
}
/* Load $MFT/Bitmap */
if ((res = mft_bitmap_load(dev)))
return res;
return -1; /* FIXME: Just added to fix compiler warning without
thinking about what should be here. (Yura) */
}
static void check_volume(ntfs_volume *vol)
{
s64 mft_num, nr_mft_records;
ntfs_log_warning("Unsupported: check_volume()\n");
unsupported++;
// For each mft record, verify that it contains a valid file record.
nr_mft_records = vol->mft_na->initialized_size >>
vol->mft_record_size_bits;
ntfs_log_info("Checking %lld MFT records.\n", nr_mft_records);
for (mft_num=0; mft_num < nr_mft_records; mft_num++) {
verify_mft_record(vol, mft_num);
}
// todo: Check metadata files.
// todo: Second pass on mft records. Now check the contents as well.
// todo: When going through runlists, build a bitmap.
// todo: cluster accounting.
return;
}
static int reset_dirty(ntfs_volume *vol)
{
u16 flags;
if (!(vol->flags | VOLUME_IS_DIRTY))
return 0;
ntfs_log_verbose("Resetting dirty flag.\n");
flags = vol->flags & ~VOLUME_IS_DIRTY;
if (ntfs_volume_write_flags(vol, flags)) {
ntfs_log_error("Error setting volume flags.\n");
return -1;
}
return 0;
}
/**
* main - Does just what C99 claim it does.
*
* For more details on arguments and results, check the man page.
*/
int main(int argc, char **argv)
{
struct ntfs_device *dev;
ntfs_volume *vol;
const char *name;
int ret;
if (argc != 2)
return RETURN_USAGE_OR_SYNTAX_ERROR;
name = argv[1];
ntfs_log_set_handler(ntfs_log_handler_outerr);
//ntfs_log_set_levels(NTFS_LOG_LEVEL_DEBUG | NTFS_LOG_LEVEL_TRACE | NTFS_LOG_LEVEL_QUIET | NTFS_LOG_LEVEL_INFO | NTFS_LOG_LEVEL_VERBOSE | NTFS_LOG_LEVEL_PROGRESS);
/* Allocate an ntfs_device structure. */
dev = ntfs_device_alloc(name, 0, &ntfs_device_default_io_ops, NULL);
if (!dev)
return RETURN_OPERATIONAL_ERROR;
if (dev->d_ops->open(dev, O_RDONLY)) { //O_RDWR/O_RDONLY?
ntfs_log_perror("Error opening partition device");
ntfs_device_free(dev);
return RETURN_OPERATIONAL_ERROR;
}
if ((ret = verify_boot_sector(dev))) {
dev->d_ops->close(dev);
return ret;
}
ntfs_log_verbose("Boot sector verification complete. Proceeding to $MFT");
verify_mft_preliminary(dev);
/* ntfs_device_mount() expects the device to be closed. */
if (dev->d_ops->close(dev))
ntfs_log_perror("Failed to close the device.");
// at this point we know that the volume is valid enough for mounting.
/* Call ntfs_device_mount() to do the actual mount. */
vol = ntfs_device_mount(dev, NTFS_MNT_RDONLY);
if (!vol) {
ntfs_device_free(dev);
return 2;
}
replay_log(vol);
if (vol->flags & VOLUME_IS_DIRTY)
ntfs_log_warning("Volume is dirty.\n");
check_volume(vol);
if (errors)
ntfs_log_info("Errors found.\n");
if (unsupported)
ntfs_log_info("Unsupported cases found.\n");
if (!errors && !unsupported) {
reset_dirty(vol);
}
ntfs_umount(vol, FALSE);
if (errors)
return 2;
if (unsupported)
return 1;
return 0;
}