https://git.reactos.org/?p=reactos.git;a=commitdiff;h=a52bc6d1799385726097ecf701f833b7a327a08e
commit a52bc6d1799385726097ecf701f833b7a327a08e Author: Jérôme Gardou <[email protected]> AuthorDate: Fri Dec 11 14:31:08 2020 +0100 Commit: Jérôme Gardou <[email protected]> CommitDate: Wed Feb 3 09:41:22 2021 +0100 [NTOS:CC] Restore read-ahead behaviour in CcCopyRead --- ntoskrnl/cc/copy.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/ntoskrnl/cc/copy.c b/ntoskrnl/cc/copy.c index 315e9f1f1b0..3dd172fa9db 100644 --- a/ntoskrnl/cc/copy.c +++ b/ntoskrnl/cc/copy.c @@ -556,6 +556,27 @@ CcCopyRead ( IoStatus->Status = STATUS_SUCCESS; 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; }
