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Windows: fallback to absolute positioning if relative positioning fails

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This can serve as workaround if a disk rejects relative positioning for
some reason.
This commit is contained in:
Mounir IDRASSI 2023-10-13 23:55:19 +02:00
parent 4cfb4b03a7
commit 5e0aec534f
No known key found for this signature in database
GPG Key ID: FC1B00364B3FE937
1 changed files with 13 additions and 10 deletions
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15
src/Format/InPlace.c
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@ -2208,26 +2208,29 @@ BOOL SaveNonSysInPlaceEncSettings (int delta, WipeAlgorithmId newWipeAlgorithm,
// 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.
//
// We fall back to absolute positioning if the relative positioning fails.
BOOL MoveFilePointer (HANDLE dev, LARGE_INTEGER offset)
{
LARGE_INTEGER currOffset;
LARGE_INTEGER diffOffset;
currOffset.QuadPart = 0;
if (SetFilePointerEx (dev, currOffset, &currOffset, FILE_CURRENT) == 0)
return FALSE;
if (SetFilePointerEx (dev, currOffset, &currOffset, FILE_CURRENT))
{
diffOffset.QuadPart = offset.QuadPart - currOffset.QuadPart;
if (diffOffset.QuadPart == 0)
return TRUE;
// Moves the file pointer by the difference between current and desired positions
if (SetFilePointerEx (dev, diffOffset, NULL, FILE_CURRENT) == 0)
return FALSE;
if (SetFilePointerEx (dev, diffOffset, NULL, FILE_CURRENT))
return TRUE;
}
// An error occurred, fallback to absolute positioning
return SetFilePointerEx (dev, offset, NULL, FILE_BEGIN);
}
// Repairs damaged sectors (i.e. those with read errors) by zeroing them.
// Note that this operating fails if there are any write errors.
int ZeroUnreadableSectors (HANDLE dev, LARGE_INTEGER startOffset, int64 size, int sectorSize, uint64 *zeroedSectorCount)