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sys: cached read/write testing

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This commit is contained in:
Bill Zissimopoulos
2016-03-11 14:44:17 -08:00
parent 3f98d1cb01
commit 151247f1e6
8 changed files with 97 additions and 43 deletions
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33
src/sys/read.c
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@ -88,6 +88,9 @@ static NTSTATUS FspFsvolReadCached(
{
PAGED_CODE();
/* assert: must be top-level IRP */
ASSERT(0 == FspIrpTopFlags(Irp));
NTSTATUS Result;
PFILE_OBJECT FileObject = IrpSp->FileObject;
FSP_FILE_NODE *FileNode = FileObject->FsContext;
@ -151,6 +154,11 @@ static NTSTATUS FspFsvolReadCached(
Result = FspCcCopyRead(FileObject, &ReadOffset, ReadLength, CanWait, Buffer,
&Irp->IoStatus);
if (!NT_SUCCESS(Result))
{
FspFileNodeRelease(FileNode, Main);
return Result;
}
if (STATUS_PENDING == Result)
{
FspFileNodeRelease(FileNode, Main);
@ -184,6 +192,9 @@ static NTSTATUS FspFsvolReadNonCached(
{
PAGED_CODE();
/* assert: either a top-level IRP or Paging I/O */
ASSERT(0 == FspIrpTopFlags(Irp) || FlagOn(Irp->Flags, IRP_PAGING_IO));
NTSTATUS Result;
PFILE_OBJECT FileObject = IrpSp->FileObject;
FSP_FILE_NODE *FileNode = FileObject->FsContext;
@ -191,6 +202,7 @@ static NTSTATUS FspFsvolReadNonCached(
LARGE_INTEGER ReadOffset = IrpSp->Parameters.Read.ByteOffset;
ULONG ReadLength = IrpSp->Parameters.Read.Length;
ULONG ReadKey = IrpSp->Parameters.Read.Key;
FSP_FSCTL_FILE_INFO FileInfo;
FSP_FSCTL_TRANSACT_REQ *Request;
ASSERT(FileNode == FileDesc->FileNode);
@ -199,6 +211,12 @@ static NTSTATUS FspFsvolReadNonCached(
if (FlagOn(IrpSp->MinorFunction, IRP_MN_MDL))
return STATUS_INVALID_PARAMETER;
/* if this is a recursive read (cache) see if we can optimize it away! */
if (FlagOn(FspIrpTopFlags(Irp), FspFileNodeAcquireMain) && /* if 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 */
if (0 == Irp->MdlAddress)
{
@ -306,18 +324,19 @@ NTSTATUS FspFsvolReadComplete(
if (0 != SafeMdl)
FspSafeMdlCopyBack(SafeMdl);
if (!PagingIo)
/* if we are top-level */
if (0 == FspIrpTopFlags(Irp))
{
if (FspFsctlTransactReadKind == Request->Kind)
{
InfoChangeNumber = FileNode->InfoChangeNumber;
FspIopResetRequest(Request, 0);
Request->Kind = FspFsctlTransactReservedKind;
FspIopResetRequest(Request, 0);
FspIopRequestContext(Request, RequestInfoChangeNumber) = (PVOID)InfoChangeNumber;
}
else
InfoChangeNumber = (ULONG)(UINT_PTR)FspIopRequestContext(Request, RequestInfoChangeNumber);
InfoChangeNumber =
(ULONG)(UINT_PTR)FspIopRequestContext(Request, RequestInfoChangeNumber);
Success = DEBUGTEST(90, TRUE) && FspFileNodeTryAcquireExclusive(FileNode, Main);
if (!Success)
@ -326,18 +345,22 @@ NTSTATUS FspFsvolReadComplete(
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)
if (SynchronousIo && !PagingIo)
FileObject->CurrentByteOffset.QuadPart =
ReadOffset.QuadPart + Response->IoStatus.Information;
FspFileNodeRelease(FileNode, Main);
}
else
{
ASSERT(PagingIo);
FspIopResetRequest(Request, 0);
}
Irp->IoStatus.Information = Response->IoStatus.Information;
Result = STATUS_SUCCESS;