NTSTATUS
FatFsdPostRequest(
IN PIRP_CONTEXT IrpContext,
IN PIRP Irp
)
/*++
Routine Description:
This routine enqueues the request packet specified by IrpContext to the
Ex Worker threads. This is a FSD routine.
Arguments:
IrpContext - Pointer to the IrpContext to be queued to the Fsp
Irp - I/O Request Packet, or NULL if it has already been completed.
Return Value:
STATUS_PENDING
--*/
{
PAGED_CODE();
NT_ASSERT( ARGUMENT_PRESENT(Irp) );
NT_ASSERT( IrpContext->OriginatingIrp == Irp );
FatPrePostIrp( IrpContext, Irp );
FatAddToWorkque( IrpContext, Irp );
//
// And return to our caller
//
return STATUS_PENDING;
}
NTSTATUS
FatPostStackOverflowRead (
IN PIRP_CONTEXT IrpContext,
IN PIRP Irp,
IN PFCB Fcb
)
/*++
Routine Description:
This routine posts a read request that could not be processed by
the fsp thread because of stack overflow potential.
Arguments:
Irp - Supplies the request to process.
Fcb - Supplies the file.
Return Value:
STATUS_PENDING.
--*/
{
KEVENT Event;
PERESOURCE Resource;
PVCB Vcb;
PAGED_CODE();
DebugTrace(0, Dbg, "Getting too close to stack limit pass request to Fsp\n", 0 );
//
// Initialize an event and get shared on the resource we will
// be later using the common read.
//
KeInitializeEvent( &Event, NotificationEvent, FALSE );
//
// Preacquire the resource the read path will require so we know the
// worker thread can proceed without waiting.
//
if (FlagOn(Irp->Flags, IRP_PAGING_IO) && (Fcb->Header.PagingIoResource != NULL)) {
Resource = Fcb->Header.PagingIoResource;
} else {
Resource = Fcb->Header.Resource;
}
//
// If there are no resources assodicated with the file (case: the virtual
// volume file), it is OK. No resources will be acquired on the other side
// as well.
//
if (Resource) {
ExAcquireResourceSharedLite( Resource, TRUE );
}
if (NodeType( Fcb ) == FAT_NTC_VCB) {
Vcb = (PVCB) Fcb;
} else {
Vcb = Fcb->Vcb;
}
try {
//
// Make the Irp just like a regular post request and
// then send the Irp to the special overflow thread.
// After the post we will wait for the stack overflow
// read routine to set the event that indicates we can
// now release the scb resource and return.
//
FatPrePostIrp( IrpContext, Irp );
//
// If this read is the result of a verify, we have to
// tell the overflow read routne to temporarily
// hijack the Vcb->VerifyThread field so that reads
// can go through.
//
if (Vcb->VerifyThread == KeGetCurrentThread()) {
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_VERIFY_READ);
}
FsRtlPostStackOverflow( IrpContext, &Event, FatStackOverflowRead );
//
// And wait for the worker thread to complete the item
//
KeWaitForSingleObject( &Event, Executive, KernelMode, FALSE, NULL );
} finally {
if (Resource) {
ExReleaseResourceLite( Resource );
}
}
return STATUS_PENDING;
}
NTSTATUS
FatPostStackOverflowRead (
IN PIRP_CONTEXT IrpContext,
IN PIRP Irp,
IN PFCB Fcb
)
/*++
Routine Description:
This routine posts a read request that could not be processed by
the fsp thread because of stack overflow potential.
Arguments:
Irp - Supplies the request to process.
Fcb - Supplies the file.
Return Value:
STATUS_PENDING.
--*/
{
PKEVENT Event;
PERESOURCE Resource;
DebugTrace(0, Dbg, "Getting too close to stack limit pass request to Fsp\n", 0 );
//
// Allocate an event and get shared on the resource we will
// be later using the common read.
//
Event = FsRtlAllocatePool( NonPagedPool, sizeof(KEVENT) );
KeInitializeEvent( Event, NotificationEvent, FALSE );
if (FlagOn(Irp->Flags, IRP_PAGING_IO) && (Fcb->Header.PagingIoResource != NULL)) {
Resource = Fcb->Header.PagingIoResource;
} else {
Resource = Fcb->Header.Resource;
}
ExAcquireResourceShared( Resource, TRUE );
try {
//
// Make the Irp just like a regular post request and
// then send the Irp to the special overflow thread.
// After the post we will wait for the stack overflow
// read routine to set the event that indicates we can
// now release the scb resource and return.
//
FatPrePostIrp( IrpContext, Irp );
//
// If this read is the result of a verify, we have to
// tell the overflow read routne to temporarily
// hijack the Vcb->VerifyThread field so that reads
// can go through.
//
if (Fcb->Vcb->VerifyThread == KeGetCurrentThread()) {
SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_VERIFY_READ);
}
FsRtlPostStackOverflow( IrpContext, Event, FatStackOverflowRead );
//
// And wait for the worker thread to complete the item
//
(VOID) KeWaitForSingleObject( Event, Executive, KernelMode, FALSE, NULL );
}
finally {
ExReleaseResource( Resource );
ExFreePool( Event );
}
return STATUS_PENDING;
}
