reactos/drivers/filesystems/msfs/finfo.c

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: drivers/filesystems/msfs/finfo.c
* PURPOSE: Mailslot filesystem
* PROGRAMMER: Eric Kohl
*/
/* INCLUDES ******************************************************************/
#include "msfs.h"
#define NDEBUG
#include <debug.h>
#undef MAILSLOT_NO_MESSAGE
#undef MAILSLOT_WAIT_FOREVER
#define MAILSLOT_NO_MESSAGE MAXULONG
#define MAILSLOT_WAIT_FOREVER MAXULONG
/* FUNCTIONS *****************************************************************/
static NTSTATUS
MsfsQueryMailslotInformation(PMSFS_FCB Fcb,
PFILE_MAILSLOT_QUERY_INFORMATION Buffer,
PULONG BufferLength)
{
KIRQL oldIrql;
if (*BufferLength < sizeof(FILE_MAILSLOT_QUERY_INFORMATION))
return STATUS_BUFFER_OVERFLOW;
Buffer->MaximumMessageSize = Fcb->MaxMessageSize;
Buffer->ReadTimeout = Fcb->TimeOut;
KeAcquireSpinLock(&Fcb->MessageListLock, &oldIrql);
Buffer->MessagesAvailable = Fcb->MessageCount;
if (Fcb->MessageCount == 0)
{
Buffer->NextMessageSize = MAILSLOT_NO_MESSAGE;
}
else
{
PMSFS_MESSAGE Message = CONTAINING_RECORD(Fcb->MessageListHead.Flink,
MSFS_MESSAGE,
MessageListEntry);
Buffer->NextMessageSize = Message->Size;
}
KeReleaseSpinLock(&Fcb->MessageListLock, oldIrql);
*BufferLength -= sizeof(FILE_MAILSLOT_QUERY_INFORMATION);
return STATUS_SUCCESS;
}
static NTSTATUS
MsfsSetMailslotInformation(PMSFS_FCB Fcb,
PFILE_MAILSLOT_SET_INFORMATION Buffer,
PULONG BufferLength)
{
if (*BufferLength < sizeof(FILE_MAILSLOT_SET_INFORMATION))
return STATUS_BUFFER_OVERFLOW;
Fcb->TimeOut = *Buffer->ReadTimeout;
return STATUS_SUCCESS;
}
NTSTATUS DEFAULTAPI
MsfsQueryInformation(PDEVICE_OBJECT DeviceObject,
PIRP Irp)
{
PIO_STACK_LOCATION IoStack;
FILE_INFORMATION_CLASS FileInformationClass;
PFILE_OBJECT FileObject;
PMSFS_FCB Fcb;
PMSFS_CCB Ccb;
PVOID SystemBuffer;
ULONG BufferLength;
NTSTATUS Status;
DPRINT("MsfsQueryInformation(DeviceObject %p Irp %p)\n",
DeviceObject, Irp);
IoStack = IoGetCurrentIrpStackLocation (Irp);
FileInformationClass = IoStack->Parameters.QueryFile.FileInformationClass;
FileObject = IoStack->FileObject;
Fcb = (PMSFS_FCB)FileObject->FsContext;
Ccb = (PMSFS_CCB)FileObject->FsContext2;
DPRINT("Mailslot name: %wZ\n", &Fcb->Name);
/* querying information is not permitted on client side */
if (Fcb->ServerCcb != Ccb)
{
Status = STATUS_ACCESS_DENIED;
Irp->IoStatus.Status = Status;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return Status;
}
SystemBuffer = Irp->AssociatedIrp.SystemBuffer;
BufferLength = IoStack->Parameters.QueryFile.Length;
switch (FileInformationClass)
{
case FileMailslotQueryInformation:
Status = MsfsQueryMailslotInformation(Fcb,
SystemBuffer,
&BufferLength);
break;
default:
Status = STATUS_NOT_IMPLEMENTED;
}
Irp->IoStatus.Status = Status;
if (NT_SUCCESS(Status))
Irp->IoStatus.Information =
IoStack->Parameters.QueryFile.Length - BufferLength;
else
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return Status;
}
NTSTATUS DEFAULTAPI
MsfsSetInformation(PDEVICE_OBJECT DeviceObject,
PIRP Irp)
{
PIO_STACK_LOCATION IoStack;
FILE_INFORMATION_CLASS FileInformationClass;
PFILE_OBJECT FileObject;
PMSFS_FCB Fcb;
PMSFS_CCB Ccb;
PVOID SystemBuffer;
ULONG BufferLength;
NTSTATUS Status;
DPRINT("MsfsSetInformation(DeviceObject %p Irp %p)\n", DeviceObject, Irp);
IoStack = IoGetCurrentIrpStackLocation (Irp);
FileInformationClass = IoStack->Parameters.QueryFile.FileInformationClass;
FileObject = IoStack->FileObject;
Fcb = (PMSFS_FCB)FileObject->FsContext;
Ccb = (PMSFS_CCB)FileObject->FsContext2;
DPRINT("Mailslot name: %wZ\n", &Fcb->Name);
/* setting information is not permitted on client side */
if (Fcb->ServerCcb != Ccb)
{
Status = STATUS_ACCESS_DENIED;
Irp->IoStatus.Status = Status;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return Status;
}
SystemBuffer = Irp->AssociatedIrp.SystemBuffer;
BufferLength = IoStack->Parameters.QueryFile.Length;
DPRINT("FileInformationClass %d\n", FileInformationClass);
DPRINT("SystemBuffer %p\n", SystemBuffer);
switch (FileInformationClass)
{
case FileMailslotSetInformation:
Status = MsfsSetMailslotInformation(Fcb,
SystemBuffer,
&BufferLength);
break;
default:
Status = STATUS_NOT_IMPLEMENTED;
}
Irp->IoStatus.Status = Status;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return Status;
}
/* EOF */