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[NTOS:CC] Restore read-ahead behaviour in CcCopyRead

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This commit is contained in:
Jérôme Gardou 2020-12-11 14:31:08 +01:00
parent 4441b1cd44
commit a52bc6d179
1 changed files with 21 additions and 0 deletions
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21
ntoskrnl/cc/copy.c
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@ -556,6 +556,27 @@ CcCopyRead (
IoStatus->Status = STATUS_SUCCESS; IoStatus->Status = STATUS_SUCCESS;
IoStatus->Information = ReadLength; IoStatus->Information = ReadLength;
/* If that was a successful sync read operation, let's handle read ahead */
if (Length == 0 && Wait)
{
PPRIVATE_CACHE_MAP PrivateCacheMap = FileObject->PrivateCacheMap;
/* If file isn't random access and next read may get us cross VACB boundary,
* schedule next read
*/
if (!BooleanFlagOn(FileObject->Flags, FO_RANDOM_ACCESS) &&
(CurrentOffset - 1) / VACB_MAPPING_GRANULARITY != (CurrentOffset + ReadLength - 1) / VACB_MAPPING_GRANULARITY)
{
CcScheduleReadAhead(FileObject, FileOffset, ReadLength);
}
/* And update read history in private cache map */
PrivateCacheMap->FileOffset1.QuadPart = PrivateCacheMap->FileOffset2.QuadPart;
PrivateCacheMap->BeyondLastByte1.QuadPart = PrivateCacheMap->BeyondLastByte2.QuadPart;
PrivateCacheMap->FileOffset2.QuadPart = FileOffset->QuadPart;
PrivateCacheMap->BeyondLastByte2.QuadPart = FileOffset->QuadPart + ReadLength;
}
return TRUE; return TRUE;
} }