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Windows: Possible workaround for logarithmic slowdown for Encrypt-In-Place on large volumes (relates to #1063)

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We replace absolute file pointer moving by relative moving with respect to current position. This was implemented as a workaround to address the performance issues related to in-place encryption. When using SetFilePointerEx() with FILE_BEGIN as the reference point, reaching the end of large drives during in-place encryption can cause significant slowdowns. By moving the file pointer relatively, these performance issues are mitigated.
This commit is contained in:
Mounir IDRASSI
2023-06-04 16:25:55 +02:00
parent 3c68349a39
commit 22466535f1
2 changed files with 52 additions and 21 deletions
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src/Format/InPlace.h
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@@ -43,6 +43,7 @@ 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);