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Windows: Better handling of quick format for file container

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We write a zeroed sector every 128 MiB, leaving other sectors untouched
This helps users visualize the progress of actual file creation while forcing Windows to allocate the disk space of each 128 MiB chunk immediately, otherwise, Windows would delay the allocation until we write the backup header at the end of the volume which would make the user think that the format process has stalled after progress bar reaches 100%.
This commit is contained in:
Mounir IDRASSI 2023-06-28 00:47:58 +02:00
parent db12703e9b
commit 579ce2fd31
No known key found for this signature in database
GPG Key ID: 02C30AE90FAE4A6F
5 changed files with 105 additions and 24 deletions
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63
src/Common/Fat.c
View File

@ -255,11 +255,14 @@ static void PutFSInfo (unsigned char *sector, fatparams *ft)
int
FormatFat (void* hwndDlgPtr, unsigned __int64 startSector, fatparams * ft, void * dev, PCRYPTO_INFO cryptoInfo, BOOL quickFormat)
FormatFat (void* hwndDlgPtr, unsigned __int64 startSector, fatparams * ft, void * dev, PCRYPTO_INFO cryptoInfo, BOOL quickFormat, BOOL bDevice)
{
int write_buf_cnt = 0;
char sector[TC_MAX_VOLUME_SECTOR_SIZE], *write_buf;
unsigned __int64 nSecNo = startSector;
unsigned __int64 nSkipSectors = 128 * (unsigned __int64) BYTES_PER_MB / ft->sector_size;
unsigned __int64 num_sectors;
DWORD bytesWritten;
int x, n;
int retVal;
CRYPTOPP_ALIGN_DATA(16) char temporaryKey[MASTER_KEYDATA_SIZE];
@ -288,7 +291,7 @@ FormatFat (void* hwndDlgPtr, unsigned __int64 startSector, fatparams * ft, void
goto fail;
PutBoot (ft, (unsigned char *) sector);
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo, startSector,
cryptoInfo) == FALSE)
goto fail;
@ -297,7 +300,7 @@ FormatFat (void* hwndDlgPtr, unsigned __int64 startSector, fatparams * ft, void
{
/* fsinfo */
PutFSInfo((unsigned char *) sector, ft);
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo, startSector,
cryptoInfo) == FALSE)
goto fail;
@ -307,7 +310,7 @@ FormatFat (void* hwndDlgPtr, unsigned __int64 startSector, fatparams * ft, void
memset (sector, 0, ft->sector_size);
sector[508+3]=0xaa; /* TrailSig */
sector[508+2]=0x55;
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo, startSector,
cryptoInfo) == FALSE)
goto fail;
}
@ -315,12 +318,12 @@ FormatFat (void* hwndDlgPtr, unsigned __int64 startSector, fatparams * ft, void
/* bootsector backup */
memset (sector, 0, ft->sector_size);
PutBoot (ft, (unsigned char *) sector);
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo, startSector,
cryptoInfo) == FALSE)
goto fail;
PutFSInfo((unsigned char *) sector, ft);
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo, startSector,
cryptoInfo) == FALSE)
goto fail;
}
@ -329,7 +332,7 @@ FormatFat (void* hwndDlgPtr, unsigned __int64 startSector, fatparams * ft, void
while (nSecNo - startSector < (unsigned int)ft->reserved)
{
memset (sector, 0, ft->sector_size);
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo, startSector,
cryptoInfo) == FALSE)
goto fail;
}
@ -373,7 +376,7 @@ FormatFat (void* hwndDlgPtr, unsigned __int64 startSector, fatparams * ft, void
}
}
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo, startSector,
cryptoInfo) == FALSE)
goto fail;
}
@ -384,7 +387,7 @@ FormatFat (void* hwndDlgPtr, unsigned __int64 startSector, fatparams * ft, void
for (x = 0; x < ft->size_root_dir / ft->sector_size; x++)
{
memset (sector, 0, ft->sector_size);
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo, startSector,
cryptoInfo) == FALSE)
goto fail;
@ -450,11 +453,11 @@ FormatFat (void* hwndDlgPtr, unsigned __int64 startSector, fatparams * ft, void
x = ft->num_sectors - ft->reserved - ft->size_root_dir / ft->sector_size - ft->fat_length * 2;
while (x--)
{
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo, startSector,
cryptoInfo) == FALSE)
goto fail;
}
UpdateProgressBar (nSecNo * ft->sector_size);
UpdateProgressBar ((nSecNo - startSector) * ft->sector_size);
if (!FlushFormatWriteBuffer (dev, write_buf, &write_buf_cnt, &nSecNo, cryptoInfo))
{
@ -466,6 +469,44 @@ FormatFat (void* hwndDlgPtr, unsigned __int64 startSector, fatparams * ft, void
burn (&tmpCI, sizeof (tmpCI));
VirtualUnlock (&tmpCI, sizeof (tmpCI));
}
else if (!bDevice)
{
if (!FlushFormatWriteBuffer (dev, write_buf, &write_buf_cnt, &nSecNo, cryptoInfo))
goto fail;
// Quick format: write a zeroed sector every 128 MiB, leaving other sectors untouched
// This helps users visualize the progress of actual file creation while forcing Windows
// to allocate the disk space of each 128 MiB chunk immediately, otherwise, Windows
// would delay the allocation until we write the backup header at the end of the volume which
// would make the user think that the format process has stalled after progress bar reaches 100%.
num_sectors = ft->num_sectors - ft->reserved - ft->size_root_dir / ft->sector_size - ft->fat_length * 2;
while (num_sectors >= nSkipSectors)
{
// seek to next sector to be written
nSecNo += (nSkipSectors - 1);
startOffset.QuadPart = nSecNo * ft->sector_size;
if (!MoveFilePointer ((HANDLE) dev, startOffset))
{
goto fail;
}
// sector array has been zeroed above
if (!WriteFile ((HANDLE) dev, sector, ft->sector_size, &bytesWritten, NULL)
|| bytesWritten != ft->sector_size)
{
goto fail;
}
nSecNo++;
num_sectors -= nSkipSectors;
if (UpdateProgressBar ((nSecNo - startSector)* ft->sector_size))
goto fail;
}
nSecNo += num_sectors;
UpdateProgressBar ((nSecNo - startSector)* ft->sector_size);
}
else
{
UpdateProgressBar ((uint64) ft->num_sectors * ft->sector_size);

2
src/Common/Fat.h
View File

@ -66,4 +66,4 @@ struct msdos_boot_sector
void GetFatParams ( fatparams *ft );
void PutBoot ( fatparams *ft , unsigned char *boot );
int FormatFat (void* hwndDlg, unsigned __int64 startSector, fatparams * ft, void * dev, PCRYPTO_INFO cryptoInfo, BOOL quickFormat);
int FormatFat (void* hwndDlg, unsigned __int64 startSector, fatparams * ft, void * dev, PCRYPTO_INFO cryptoInfo, BOOL quickFormat, BOOL bDevice);

58
src/Common/Format.c
View File

@ -538,7 +538,7 @@ int TCFormatVolume (volatile FORMAT_VOL_PARAMETERS *volParams)
goto error;
}
nStatus = FormatNoFs (hwndDlg, startSector, num_sectors, dev, cryptoInfo, volParams->quickFormat);
nStatus = FormatNoFs (hwndDlg, startSector, num_sectors, dev, cryptoInfo, volParams->quickFormat, volParams->bDevice);
if (volParams->bDevice)
StopFormatWriteThread();
@ -571,7 +571,7 @@ int TCFormatVolume (volatile FORMAT_VOL_PARAMETERS *volParams)
goto error;
}
nStatus = FormatFat (hwndDlg, startSector, &ft, (void *) dev, cryptoInfo, volParams->quickFormat);
nStatus = FormatFat (hwndDlg, startSector, &ft, (void *) dev, cryptoInfo, volParams->quickFormat, volParams->bDevice);
if (volParams->bDevice)
StopFormatWriteThread();
@ -847,11 +847,13 @@ int TCFormatVolume (volatile FORMAT_VOL_PARAMETERS *volParams)
}
int FormatNoFs (HWND hwndDlg, unsigned __int64 startSector, __int64 num_sectors, void * dev, PCRYPTO_INFO cryptoInfo, BOOL quickFormat)
int FormatNoFs (HWND hwndDlg, unsigned __int64 startSector, unsigned __int64 num_sectors, void * dev, PCRYPTO_INFO cryptoInfo, BOOL quickFormat, BOOL bDevice)
{
int write_buf_cnt = 0;
char sector[TC_MAX_VOLUME_SECTOR_SIZE], *write_buf;
unsigned __int64 nSecNo = startSector;
unsigned __int64 nSkipSectors = 128 * (unsigned __int64) BYTES_PER_MB / FormatSectorSize;
DWORD bytesWritten;
int retVal = 0;
DWORD err;
CRYPTOPP_ALIGN_DATA(16) char temporaryKey[MASTER_KEYDATA_SIZE];
@ -927,18 +929,56 @@ int FormatNoFs (HWND hwndDlg, unsigned __int64 startSector, __int64 num_sectors,
while (num_sectors--)
{
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo,
if (WriteSector (dev, sector, write_buf, &write_buf_cnt, &nSecNo, startSector,
cryptoInfo) == FALSE)
goto fail;
}
if (UpdateProgressBar ((nSecNo - startSector) * FormatSectorSize))
return FALSE;
if (!FlushFormatWriteBuffer (dev, write_buf, &write_buf_cnt, &nSecNo, cryptoInfo))
goto fail;
}
else
nSecNo = num_sectors;
else if (!bDevice)
{
// Quick format: write a zeroed sector every 128 MiB, leaving other sectors untouched
// This helps users visualize the progress of actual file creation while forcing Windows
// to allocate the disk space of each 128 MiB chunk immediately, otherwise, Windows
// would delay the allocation until we write the backup header at the end of the volume which
// would make the user think that the format process has stalled after progress bar reaches 100%.
while (num_sectors >= nSkipSectors)
{
// seek to next sector to be written
nSecNo += (nSkipSectors - 1);
startOffset.QuadPart = nSecNo * FormatSectorSize;
if (!MoveFilePointer ((HANDLE) dev, startOffset))
{
goto fail;
}
// sector array has been zeroed above
if (!WriteFile ((HANDLE) dev, sector, FormatSectorSize, &bytesWritten, NULL)
|| bytesWritten != FormatSectorSize)
{
goto fail;
}
nSecNo++;
num_sectors -= nSkipSectors;
UpdateProgressBar (nSecNo * FormatSectorSize);
if (UpdateProgressBar ((nSecNo - startSector)* FormatSectorSize))
goto fail;
}
nSecNo += num_sectors;
}
else
{
nSecNo += num_sectors;
}
UpdateProgressBar ((nSecNo - startSector) * FormatSectorSize);
// Restore the original secondary key (XTS mode) in case NTFS format fails and the user wants to try FAT immediately
memcpy (cryptoInfo->k2, originalK2, sizeof (cryptoInfo->k2));
@ -1269,7 +1309,7 @@ BOOL ExternalFormatFs (int driveNo, int clusterSize, int fsType)
BOOL WriteSector (void *dev, char *sector,
char *write_buf, int *write_buf_cnt,
__int64 *nSecNo, PCRYPTO_INFO cryptoInfo)
unsigned __int64 *nSecNo, unsigned __int64 startSector, PCRYPTO_INFO cryptoInfo)
{
static __int32 updateTime = 0;
@ -1283,7 +1323,7 @@ BOOL WriteSector (void *dev, char *sector,
if (GetTickCount () - updateTime > 25)
{
if (UpdateProgressBar (*nSecNo * FormatSectorSize))
if (UpdateProgressBar ((*nSecNo - startSector) * FormatSectorSize))
return FALSE;
updateTime = GetTickCount ();

5
src/Common/Format.h
View File

@ -78,11 +78,12 @@ BOOL FormatNtfs (int driveNo, int clusterSize);
BOOL FormatFs (int driveNo, int clusterSize, int fsType);
BOOL ExternalFormatFs (int driveNo, int clusterSize, int fsType);
uint64 GetVolumeDataAreaSize (BOOL hiddenVolume, uint64 volumeSize);
int FormatNoFs (HWND hwndDlg, unsigned __int64 startSector, __int64 num_sectors, void *dev, PCRYPTO_INFO cryptoInfo, BOOL quickFormat);
BOOL WriteSector ( void *dev , char *sector , char *write_buf , int *write_buf_cnt , __int64 *nSecNo , PCRYPTO_INFO cryptoInfo );
int FormatNoFs (HWND hwndDlg, unsigned __int64 startSector, unsigned __int64 num_sectors, void *dev, PCRYPTO_INFO cryptoInfo, BOOL quickFormat, BOOL bDevice);
BOOL WriteSector ( void *dev , char *sector , char *write_buf , int *write_buf_cnt , unsigned __int64 *nSecNo , unsigned __int64 startSector, PCRYPTO_INFO cryptoInfo );
BOOL FlushFormatWriteBuffer (void *dev, char *write_buf, int *write_buf_cnt, __int64 *nSecNo, PCRYPTO_INFO cryptoInfo);
static BOOL StartFormatWriteThread ();
static void StopFormatWriteThread ();
BOOL MoveFilePointer (HANDLE dev, LARGE_INTEGER offset);
#define FILESYS_NONE 0
#define FILESYS_FAT 1

1
src/Format/InPlace.h
View File

@ -43,7 +43,6 @@ static int DismountFileSystem (HWND hwndDlg, HANDLE dev, int driveLetter, BOOL b
static int ConcealNTFS (HANDLE dev);
BOOL SaveNonSysInPlaceEncSettings (int delta, WipeAlgorithmId wipeAlgorithm, BOOL bDecrypting);
static void ExportProgressStats (__int64 bytesDone, __int64 totalSize);
BOOL MoveFilePointer (HANDLE dev, LARGE_INTEGER offset);
int ZeroUnreadableSectors (HANDLE dev, LARGE_INTEGER startOffset, int64 size, int sectorSize, uint64 *zeroedSectorCount);
static int OpenBackupHeader (HANDLE dev, const wchar_t *devicePath, Password *password, int pkcs5, int pim, PCRYPTO_INFO *retCryptoInfo, CRYPTO_INFO *headerCryptoInfo, __int64 deviceSize);
BOOL MoveClustersBeforeThreshold (HANDLE volumeHandle, PWSTR volumeDevicePath, int64 clusterThreshold);