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[FREELDR]

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Finally commit the patch to improve freeldr disk performance by Carlo Bramini.
Obviously someone wants to read 0 bytes and that should not fail.

svn path=/trunk/; revision=57283
This commit is contained in:
Timo Kreuzer 2012-09-11 21:15:39 +00:00
parent f9201cb0dd
commit a466b50b71
1 changed files with 27 additions and 13 deletions
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40
reactos/boot/freeldr/freeldr/arch/i386/hwdisk.c
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@ -114,31 +114,45 @@ static LONG DiskRead(ULONG FileId, VOID* Buffer, ULONG N, ULONG* Count)
{ {
DISKCONTEXT* Context = FsGetDeviceSpecific(FileId); DISKCONTEXT* Context = FsGetDeviceSpecific(FileId);
UCHAR* Ptr = (UCHAR*)Buffer; UCHAR* Ptr = (UCHAR*)Buffer;
ULONG i, Length; ULONG Length, TotalSectors, MaxSectors, ReadSectors;
BOOLEAN ret; BOOLEAN ret;
ULONGLONG SectorOffset;
*Count = 0; TotalSectors = (N + Context->SectorSize - 1) / Context->SectorSize;
i = 0; MaxSectors = DISKREADBUFFER_SIZE / Context->SectorSize;
while (N > 0) SectorOffset = Context->SectorNumber + Context->SectorOffset;
ret = 1;
while (TotalSectors)
{ {
Length = N; ReadSectors = TotalSectors;
if (Length > Context->SectorSize) if (ReadSectors > MaxSectors)
Length = Context->SectorSize; ReadSectors = MaxSectors;
ret = MachDiskReadLogicalSectors( ret = MachDiskReadLogicalSectors(
Context->DriveNumber, Context->DriveNumber,
Context->SectorNumber + Context->SectorOffset + i, SectorOffset,
1, ReadSectors,
(PVOID)DISKREADBUFFER); (PVOID)DISKREADBUFFER);
if (!ret) if (!ret)
return EIO; break;
Length = ReadSectors * Context->SectorSize;
if (Length > N)
Length = N;
RtlCopyMemory(Ptr, (PVOID)DISKREADBUFFER, Length); RtlCopyMemory(Ptr, (PVOID)DISKREADBUFFER, Length);
Ptr += Length; Ptr += Length;
*Count += Length;
N -= Length; N -= Length;
i++; SectorOffset += ReadSectors;
TotalSectors -= ReadSectors;
} }
return ESUCCESS; *Count = Ptr - (UCHAR *)Buffer;
return (!ret) ? EIO : ESUCCESS;
} }
static LONG DiskSeek(ULONG FileId, LARGE_INTEGER* Position, SEEKMODE SeekMode) static LONG DiskSeek(ULONG FileId, LARGE_INTEGER* Position, SEEKMODE SeekMode)