finfo.c File Reference

#include "msfs.h"
#include <debug.h>

Include dependency graph for finfo.c:

Go to the source code of this file.

Macros
#define	NDEBUG
#define	MAILSLOT_NO_MESSAGE   MAXULONG
#define	MAILSLOT_WAIT_FOREVER   MAXULONG

Functions
static NTSTATUS	MsfsQueryMailslotInformation (PMSFS_FCB Fcb, PFILE_MAILSLOT_QUERY_INFORMATION Buffer, PULONG BufferLength)
static NTSTATUS	MsfsSetMailslotInformation (PMSFS_FCB Fcb, PFILE_MAILSLOT_SET_INFORMATION Buffer, PULONG BufferLength)
NTSTATUS DEFAULTAPI	MsfsQueryInformation (PDEVICE_OBJECT DeviceObject, PIRP Irp)
NTSTATUS DEFAULTAPI	MsfsSetInformation (PDEVICE_OBJECT DeviceObject, PIRP Irp)

Macro Definition Documentation

MAILSLOT_NO_MESSAGE

#define MAILSLOT_NO_MESSAGE   MAXULONG

Definition at line 18 of file finfo.c.

MAILSLOT_WAIT_FOREVER

#define MAILSLOT_WAIT_FOREVER   MAXULONG

Definition at line 19 of file finfo.c.

NDEBUG

#define NDEBUG

Definition at line 13 of file finfo.c.

Function Documentation

MsfsQueryInformation()

NTSTATUS DEFAULTAPI MsfsQueryInformation	(	PDEVICE_OBJECT	DeviceObject,
		PIRP	Irp
	)

Definition at line 72 of file finfo.c.

{
    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;
}

MsfsQueryMailslotInformation()

static NTSTATUS MsfsQueryMailslotInformation ( PMSFS_FCB  Fcb, PFILE_MAILSLOT_QUERY_INFORMATION  Buffer, PULONG  BufferLength  )

static

Definition at line 24 of file finfo.c.

{
    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;
}

Referenced by MsfsQueryInformation().

MsfsSetInformation()

NTSTATUS DEFAULTAPI MsfsSetInformation	(	PDEVICE_OBJECT	DeviceObject,
		PIRP	Irp
	)

Definition at line 136 of file finfo.c.

{
    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;
}

MsfsSetMailslotInformation()

static NTSTATUS MsfsSetMailslotInformation ( PMSFS_FCB  Fcb, PFILE_MAILSLOT_SET_INFORMATION  Buffer, PULONG  BufferLength  )

static

Definition at line 58 of file finfo.c.

{
    if (*BufferLength < sizeof(FILE_MAILSLOT_SET_INFORMATION))
        return STATUS_BUFFER_OVERFLOW;

    Fcb->TimeOut = *Buffer->ReadTimeout;

    return STATUS_SUCCESS;
}

Referenced by MsfsSetInformation().