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