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Code Activity

sys: IRP_MJ_READ: remove FspFileNodeTrySetFileInfo at completion

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sys: IRP_MJ_READ: remove PagingIo early exit optimization
sys: IRP_MJ_WRITE: remove PagingIo early exit optimization
This commit is contained in:
Bill Zissimopoulos
2016-04-13 20:33:10 -07:00
parent 41296044e6
commit 1239c610a5
6 changed files with 4 additions and 58 deletions
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38
src/sys/read.c
View File

@@ -36,9 +36,6 @@ enum
RequestSafeMdl = 1,
RequestAddress = 2,
RequestProcess = 3,
/* ReadNonCachedComplete retry */
RequestInfoChangeNumber = 0,
};
static NTSTATUS FspFsvolRead(
@@ -210,7 +207,6 @@ static NTSTATUS FspFsvolReadNonCached(
ULONG ReadLength = IrpSp->Parameters.Read.Length;
ULONG ReadKey = IrpSp->Parameters.Read.Key;
BOOLEAN PagingIo = BooleanFlagOn(Irp->Flags, IRP_PAGING_IO);
FSP_FSCTL_FILE_INFO FileInfo;
FSP_FSCTL_TRANSACT_REQ *Request;
BOOLEAN Success;
@@ -220,13 +216,6 @@ static NTSTATUS FspFsvolReadNonCached(
if (FlagOn(IrpSp->MinorFunction, IRP_MN_MDL))
return STATUS_INVALID_PARAMETER;
/* if this is a Paging I/O see if we can optimize it away! */
if (PagingIo && /* if this is Paging I/O */
FlagOn(FspIrpTopFlags(Irp), FspFileNodeAcquireMain) && /* and TopLevelIrp has acquired Main */
FspFileNodeTryGetFileInfo(FileNode, &FileInfo) && /* and the cached FileSize is valid */
(UINT64)ReadOffset.QuadPart >= FileInfo.FileSize) /* and the ReadOffset is past EOF */
return STATUS_END_OF_FILE;
/* probe and lock the user buffer */
Result = FspLockUserBuffer(Irp, ReadLength, IoWriteAccess);
if (!NT_SUCCESS(Result))
@@ -348,12 +337,9 @@ NTSTATUS FspFsvolReadComplete(
FSP_FSCTL_TRANSACT_REQ *Request = FspIrpRequest(Irp);
FSP_SAFE_MDL *SafeMdl = FspIopRequestContext(Request, RequestSafeMdl);
PFILE_OBJECT FileObject = IrpSp->FileObject;
FSP_FILE_NODE *FileNode = FileObject->FsContext;
LARGE_INTEGER ReadOffset = IrpSp->Parameters.Read.ByteOffset;
BOOLEAN PagingIo = BooleanFlagOn(Irp->Flags, IRP_PAGING_IO);
BOOLEAN SynchronousIo = BooleanFlagOn(FileObject->Flags, FO_SYNCHRONOUS_IO);
ULONG InfoChangeNumber;
BOOLEAN Success;
if (0 != SafeMdl)
FspSafeMdlCopyBack(SafeMdl);
@@ -361,34 +347,12 @@ NTSTATUS FspFsvolReadComplete(
/* if we are top-level */
if (0 == FspIrpTopFlags(Irp))
{
if (FspFsctlTransactReadKind == Request->Kind)
{
InfoChangeNumber = FileNode->InfoChangeNumber;
Request->Kind = FspFsctlTransactReservedKind;
FspIopResetRequest(Request, 0);
FspIopRequestContext(Request, RequestInfoChangeNumber) = (PVOID)InfoChangeNumber;
}
else
InfoChangeNumber =
(ULONG)(UINT_PTR)FspIopRequestContext(Request, RequestInfoChangeNumber);
Success = DEBUGTEST(90) && FspFileNodeTryAcquireExclusive(FileNode, Main);
if (!Success)
{
FspIopRetryCompleteIrp(Irp, Response, &Result);
FSP_RETURN();
}
/* update file info */
FspFileNodeTrySetFileInfo(FileNode, FileObject, &Response->Rsp.Read.FileInfo,
InfoChangeNumber);
/* update the current file offset if synchronous I/O (and not paging I/O) */
if (SynchronousIo && !PagingIo)
FileObject->CurrentByteOffset.QuadPart =
ReadOffset.QuadPart + Response->IoStatus.Information;
FspFileNodeRelease(FileNode, Main);
FspIopResetRequest(Request, 0);
}
else
{

8
src/sys/write.c
View File

@@ -258,7 +258,6 @@ static NTSTATUS FspFsvolWriteNonCached(
BOOLEAN WriteToEndOfFile =
FILE_WRITE_TO_END_OF_FILE == WriteOffset.LowPart && -1L == WriteOffset.HighPart;
BOOLEAN PagingIo = BooleanFlagOn(Irp->Flags, IRP_PAGING_IO);
FSP_FSCTL_FILE_INFO FileInfo;
FSP_FSCTL_TRANSACT_REQ *Request;
BOOLEAN Success;
@@ -276,13 +275,6 @@ static NTSTATUS FspFsvolWriteNonCached(
if (FspIoqStopped(FspFsvolDeviceExtension(FsvolDeviceObject)->Ioq))
return FspFsvolDeviceStoppedStatus(FsvolDeviceObject);
/* if this is a Paging I/O see if we can optimize it away! */
if (PagingIo && /* if this is Paging I/O */
FlagOn(FspIrpTopFlags(Irp), FspFileNodeAcquireMain) && /* and TopLevelIrp has acquired Main */
FspFileNodeTryGetFileInfo(FileNode, &FileInfo) && /* and the cached FileSize is valid */
(UINT64)WriteOffset.QuadPart >= FileInfo.FileSize) /* and the WriteOffset is past EOF */
return STATUS_SUCCESS;
/* probe and lock the user buffer */
Result = FspLockUserBuffer(Irp, WriteLength, IoReadAccess);
if (!NT_SUCCESS(Result))