mirror of
https://github.com/reactos/reactos.git
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0daa5547d9
This implies that a sample for W10. It has been backported to NT5.2; not sure how it would work on a W2K3 (feel free to test!)
770 lines
18 KiB
C
770 lines
18 KiB
C
/*++
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Copyright (c) 1989-2000 Microsoft Corporation
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Module Name:
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LockCtrl.c
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Abstract:
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This module implements the Lock Control routines for Fat called
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by the dispatch driver.
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--*/
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#include "fatprocs.h"
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//
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// The local debug trace level
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//
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#define Dbg (DEBUG_TRACE_LOCKCTRL)
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, FatCommonLockControl)
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#pragma alloc_text(PAGE, FatFastLock)
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#pragma alloc_text(PAGE, FatFastUnlockAll)
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#pragma alloc_text(PAGE, FatFastUnlockAllByKey)
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#pragma alloc_text(PAGE, FatFastUnlockSingle)
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#pragma alloc_text(PAGE, FatFsdLockControl)
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#endif
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_Function_class_(IRP_MJ_LOCK_CONTROL)
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_Function_class_(DRIVER_DISPATCH)
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NTSTATUS
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NTAPI
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FatFsdLockControl (
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_In_ PVOLUME_DEVICE_OBJECT VolumeDeviceObject,
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_Inout_ PIRP Irp
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)
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/*++
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Routine Description:
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This routine implements the FSD part of Lock control operations
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Arguments:
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VolumeDeviceObject - Supplies the volume device object where the
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file exists
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Irp - Supplies the Irp being processed
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Return Value:
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NTSTATUS - The FSD status for the IRP
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--*/
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{
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NTSTATUS Status;
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PIRP_CONTEXT IrpContext = NULL;
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BOOLEAN TopLevel;
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PAGED_CODE();
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DebugTrace(+1, Dbg, "FatFsdLockControl\n", 0);
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//
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// Call the common Lock Control routine, with blocking allowed if
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// synchronous
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//
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FsRtlEnterFileSystem();
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TopLevel = FatIsIrpTopLevel( Irp );
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_SEH2_TRY {
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IrpContext = FatCreateIrpContext( Irp, CanFsdWait( Irp ) );
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Status = FatCommonLockControl( IrpContext, Irp );
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} _SEH2_EXCEPT(FatExceptionFilter( IrpContext, _SEH2_GetExceptionInformation() )) {
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//
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// We had some trouble trying to perform the requested
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// operation, so we'll abort the I/O request with
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// the error status that we get back from the
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// execption code
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//
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Status = FatProcessException( IrpContext, Irp, _SEH2_GetExceptionCode() );
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} _SEH2_END;
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if (TopLevel) { IoSetTopLevelIrp( NULL ); }
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FsRtlExitFileSystem();
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//
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// And return to our caller
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//
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DebugTrace(-1, Dbg, "FatFsdLockControl -> %08lx\n", Status);
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UNREFERENCED_PARAMETER( VolumeDeviceObject );
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return Status;
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}
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_Function_class_(FAST_IO_LOCK)
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BOOLEAN
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NTAPI
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FatFastLock (
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IN PFILE_OBJECT FileObject,
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IN PLARGE_INTEGER FileOffset,
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IN PLARGE_INTEGER Length,
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PEPROCESS ProcessId,
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ULONG Key,
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BOOLEAN FailImmediately,
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BOOLEAN ExclusiveLock,
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OUT PIO_STATUS_BLOCK IoStatus,
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IN PDEVICE_OBJECT DeviceObject
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)
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/*++
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Routine Description:
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This is a call back routine for doing the fast lock call.
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Arguments:
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FileObject - Supplies the file object used in this operation
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FileOffset - Supplies the file offset used in this operation
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Length - Supplies the length used in this operation
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ProcessId - Supplies the process ID used in this operation
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Key - Supplies the key used in this operation
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FailImmediately - Indicates if the request should fail immediately
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if the lock cannot be granted.
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ExclusiveLock - Indicates if this is a request for an exclusive or
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shared lock
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IoStatus - Receives the Status if this operation is successful
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Return Value:
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BOOLEAN - TRUE if this operation completed and FALSE if caller
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needs to take the long route.
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--*/
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{
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BOOLEAN Results = FALSE;
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PVCB Vcb;
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PFCB Fcb;
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PCCB Ccb;
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PAGED_CODE();
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UNREFERENCED_PARAMETER( DeviceObject );
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DebugTrace(+1, Dbg, "FatFastLock\n", 0);
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//
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// Decode the type of file object we're being asked to process and make
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// sure it is only a user file open.
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//
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if (FatDecodeFileObject( FileObject, &Vcb, &Fcb, &Ccb ) != UserFileOpen) {
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IoStatus->Status = STATUS_INVALID_PARAMETER;
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IoStatus->Information = 0;
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DebugTrace(-1, Dbg, "FatFastLock -> TRUE (STATUS_INVALID_PARAMETER)\n", 0);
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return TRUE;
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}
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//
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// Acquire shared access to the Fcb
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//
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FsRtlEnterFileSystem();
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ExAcquireResourceSharedLite( Fcb->Header.Resource, TRUE );
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_SEH2_TRY {
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//
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// We check whether we can proceed
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// based on the state of the file oplocks.
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//
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if (!FsRtlOplockIsFastIoPossible( FatGetFcbOplock(Fcb) )) {
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try_return( Results = FALSE );
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}
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//
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// Now call the FsRtl routine to do the actual processing of the
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// Lock request
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//
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#ifdef _MSC_VER
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#pragma prefast( suppress:28159, "prefast indicates this API is obsolete but it is ok for fastfat to continue using it" )
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#endif
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Results = FsRtlFastLock( &Fcb->Specific.Fcb.FileLock,
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FileObject,
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FileOffset,
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Length,
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ProcessId,
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Key,
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FailImmediately,
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ExclusiveLock,
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IoStatus,
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NULL,
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FALSE );
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if (Results) {
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//
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// Set the flag indicating if Fast I/O is possible
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//
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Fcb->Header.IsFastIoPossible = FatIsFastIoPossible( Fcb );
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}
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try_exit: NOTHING;
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} _SEH2_FINALLY {
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DebugUnwind( FatFastLock );
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//
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// Release the Fcb, and return to our caller
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//
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ExReleaseResourceLite( Fcb->Header.Resource );
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FsRtlExitFileSystem();
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DebugTrace(-1, Dbg, "FatFastLock -> %08lx\n", Results);
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} _SEH2_END;
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return Results;
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}
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_Function_class_(FAST_IO_UNLOCK_SINGLE)
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BOOLEAN
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NTAPI
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FatFastUnlockSingle (
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IN PFILE_OBJECT FileObject,
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IN PLARGE_INTEGER FileOffset,
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IN PLARGE_INTEGER Length,
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PEPROCESS ProcessId,
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ULONG Key,
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OUT PIO_STATUS_BLOCK IoStatus,
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IN PDEVICE_OBJECT DeviceObject
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)
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/*++
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Routine Description:
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This is a call back routine for doing the fast unlock single call.
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Arguments:
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FileObject - Supplies the file object used in this operation
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FileOffset - Supplies the file offset used in this operation
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Length - Supplies the length used in this operation
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ProcessId - Supplies the process ID used in this operation
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Key - Supplies the key used in this operation
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Status - Receives the Status if this operation is successful
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Return Value:
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BOOLEAN - TRUE if this operation completed and FALSE if caller
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needs to take the long route.
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--*/
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{
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BOOLEAN Results = FALSE;
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PVCB Vcb;
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PFCB Fcb;
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PCCB Ccb;
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PAGED_CODE();
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UNREFERENCED_PARAMETER( DeviceObject );
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DebugTrace(+1, Dbg, "FatFastUnlockSingle\n", 0);
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IoStatus->Information = 0;
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//
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// Decode the type of file object we're being asked to process and make sure
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// it is only a user file open
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//
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if (FatDecodeFileObject( FileObject, &Vcb, &Fcb, &Ccb ) != UserFileOpen) {
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IoStatus->Status = STATUS_INVALID_PARAMETER;
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DebugTrace(-1, Dbg, "FatFastUnlockSingle -> TRUE (STATUS_INVALID_PARAMETER)\n", 0);
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return TRUE;
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}
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//
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// Acquire exclusive access to the Fcb this operation can always wait
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//
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FsRtlEnterFileSystem();
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_SEH2_TRY {
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//
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// We check whether we can proceed based on the state of the file oplocks.
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//
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if (!FsRtlOplockIsFastIoPossible( FatGetFcbOplock(Fcb) )) {
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try_return( Results = FALSE );
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}
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//
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// Now call the FsRtl routine to do the actual processing of the
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// Lock request. The call will always succeed.
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//
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Results = TRUE;
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IoStatus->Status = FsRtlFastUnlockSingle( &Fcb->Specific.Fcb.FileLock,
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FileObject,
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FileOffset,
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Length,
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ProcessId,
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Key,
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NULL,
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FALSE );
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//
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// Set the flag indicating if Fast I/O is possible
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//
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Fcb->Header.IsFastIoPossible = FatIsFastIoPossible( Fcb );
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try_exit: NOTHING;
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} _SEH2_FINALLY {
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DebugUnwind( FatFastUnlockSingle );
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//
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// Release the Fcb, and return to our caller
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//
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FsRtlExitFileSystem();
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DebugTrace(-1, Dbg, "FatFastUnlockSingle -> %08lx\n", Results);
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} _SEH2_END;
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return Results;
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}
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_Function_class_(FAST_IO_UNLOCK_ALL)
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BOOLEAN
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NTAPI
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FatFastUnlockAll (
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IN PFILE_OBJECT FileObject,
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PEPROCESS ProcessId,
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OUT PIO_STATUS_BLOCK IoStatus,
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IN PDEVICE_OBJECT DeviceObject
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)
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/*++
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Routine Description:
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This is a call back routine for doing the fast unlock all call.
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Arguments:
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FileObject - Supplies the file object used in this operation
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ProcessId - Supplies the process ID used in this operation
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Status - Receives the Status if this operation is successful
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Return Value:
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BOOLEAN - TRUE if this operation completed and FALSE if caller
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needs to take the long route.
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--*/
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{
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BOOLEAN Results = FALSE;
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PVCB Vcb;
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PFCB Fcb;
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PCCB Ccb;
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PAGED_CODE();
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UNREFERENCED_PARAMETER( DeviceObject );
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DebugTrace(+1, Dbg, "FatFastUnlockAll\n", 0);
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IoStatus->Information = 0;
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//
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// Decode the type of file object we're being asked to process and make sure
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// it is only a user file open.
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//
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if (FatDecodeFileObject( FileObject, &Vcb, &Fcb, &Ccb ) != UserFileOpen) {
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IoStatus->Status = STATUS_INVALID_PARAMETER;
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DebugTrace(-1, Dbg, "FatFastUnlockAll -> TRUE (STATUS_INVALID_PARAMETER)\n", 0);
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return TRUE;
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}
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//
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// Acquire exclusive access to the Fcb this operation can always wait
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//
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FsRtlEnterFileSystem();
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(VOID) ExAcquireResourceSharedLite( Fcb->Header.Resource, TRUE );
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_SEH2_TRY {
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//
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// We check whether we can proceed based on the state of the file oplocks.
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//
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if (!FsRtlOplockIsFastIoPossible( FatGetFcbOplock(Fcb) )) {
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try_return( Results = FALSE );
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}
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//
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// Now call the FsRtl routine to do the actual processing of the
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// Lock request. The call will always succeed.
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//
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Results = TRUE;
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IoStatus->Status = FsRtlFastUnlockAll( &Fcb->Specific.Fcb.FileLock,
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FileObject,
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ProcessId,
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NULL );
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//
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// Set the flag indicating if Fast I/O is possible
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//
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Fcb->Header.IsFastIoPossible = FatIsFastIoPossible( Fcb );
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try_exit: NOTHING;
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} _SEH2_FINALLY {
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DebugUnwind( FatFastUnlockAll );
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//
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// Release the Fcb, and return to our caller
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//
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ExReleaseResourceLite( (Fcb)->Header.Resource );
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FsRtlExitFileSystem();
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DebugTrace(-1, Dbg, "FatFastUnlockAll -> %08lx\n", Results);
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} _SEH2_END;
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return Results;
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}
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_Function_class_(FAST_IO_UNLOCK_ALL_BY_KEY)
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BOOLEAN
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NTAPI
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FatFastUnlockAllByKey (
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IN PFILE_OBJECT FileObject,
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PVOID ProcessId,
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ULONG Key,
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OUT PIO_STATUS_BLOCK IoStatus,
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IN PDEVICE_OBJECT DeviceObject
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)
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/*++
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Routine Description:
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This is a call back routine for doing the fast unlock all by key call.
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Arguments:
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FileObject - Supplies the file object used in this operation
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ProcessId - Supplies the process ID used in this operation
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Key - Supplies the key used in this operation
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Status - Receives the Status if this operation is successful
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Return Value:
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BOOLEAN - TRUE if this operation completed and FALSE if caller
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needs to take the long route.
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--*/
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{
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BOOLEAN Results = FALSE;
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PVCB Vcb;
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PFCB Fcb;
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PCCB Ccb;
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PAGED_CODE();
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UNREFERENCED_PARAMETER( DeviceObject );
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DebugTrace(+1, Dbg, "FatFastUnlockAllByKey\n", 0);
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IoStatus->Information = 0;
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//
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// Decode the type of file object we're being asked to process and make sure
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// it is only a user file open.
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//
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if (FatDecodeFileObject( FileObject, &Vcb, &Fcb, &Ccb ) != UserFileOpen) {
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IoStatus->Status = STATUS_INVALID_PARAMETER;
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DebugTrace(-1, Dbg, "FatFastUnlockAll -> TRUE (STATUS_INVALID_PARAMETER)\n", 0);
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return TRUE;
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}
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//
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// Acquire exclusive access to the Fcb this operation can always wait
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//
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FsRtlEnterFileSystem();
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(VOID) ExAcquireResourceSharedLite( Fcb->Header.Resource, TRUE );
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_SEH2_TRY {
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//
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// We check whether we can proceed based on the state of the file oplocks.
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//
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if (!FsRtlOplockIsFastIoPossible( FatGetFcbOplock(Fcb) )) {
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try_return( Results = FALSE );
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}
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//
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// Now call the FsRtl routine to do the actual processing of the
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// Lock request. The call will always succeed.
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//
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Results = TRUE;
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IoStatus->Status = FsRtlFastUnlockAllByKey( &Fcb->Specific.Fcb.FileLock,
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FileObject,
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ProcessId,
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Key,
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NULL );
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//
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// Set the flag indicating if Fast I/O is possible
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//
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Fcb->Header.IsFastIoPossible = FatIsFastIoPossible( Fcb );
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try_exit: NOTHING;
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} _SEH2_FINALLY {
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DebugUnwind( FatFastUnlockAllByKey );
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//
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// Release the Fcb, and return to our caller
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//
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ExReleaseResourceLite( (Fcb)->Header.Resource );
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FsRtlExitFileSystem();
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DebugTrace(-1, Dbg, "FatFastUnlockAllByKey -> %08lx\n", Results);
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} _SEH2_END;
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return Results;
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}
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_Requires_lock_held_(_Global_critical_region_)
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NTSTATUS
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FatCommonLockControl (
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IN PIRP_CONTEXT IrpContext,
|
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IN PIRP Irp
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)
|
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|
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/*++
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|
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Routine Description:
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|
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This is the common routine for doing Lock control operations called
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by both the fsd and fsp threads
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|
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Arguments:
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|
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Irp - Supplies the Irp to process
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Return Value:
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NTSTATUS - The return status for the operation
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--*/
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{
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NTSTATUS Status = STATUS_SUCCESS;
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PIO_STACK_LOCATION IrpSp;
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TYPE_OF_OPEN TypeOfOpen;
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PVCB Vcb;
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PFCB Fcb;
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PCCB Ccb;
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||
|
||
BOOLEAN OplockPostIrp = FALSE;
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// Get a pointer to the current Irp stack location
|
||
//
|
||
|
||
IrpSp = IoGetCurrentIrpStackLocation( Irp );
|
||
|
||
DebugTrace(+1, Dbg, "FatCommonLockControl\n", 0);
|
||
DebugTrace( 0, Dbg, "Irp = %p\n", Irp);
|
||
DebugTrace( 0, Dbg, "MinorFunction = %08lx\n", IrpSp->MinorFunction);
|
||
|
||
//
|
||
// Decode the type of file object we're being asked to process
|
||
//
|
||
|
||
TypeOfOpen = FatDecodeFileObject( IrpSp->FileObject, &Vcb, &Fcb, &Ccb );
|
||
|
||
//
|
||
// If the file is not a user file open then we reject the request
|
||
// as an invalid parameter
|
||
//
|
||
|
||
if (TypeOfOpen != UserFileOpen) {
|
||
|
||
FatCompleteRequest( IrpContext, Irp, STATUS_INVALID_PARAMETER );
|
||
|
||
DebugTrace(-1, Dbg, "FatCommonLockControl -> STATUS_INVALID_PARAMETER\n", 0);
|
||
return STATUS_INVALID_PARAMETER;
|
||
}
|
||
|
||
//
|
||
// Acquire exclusive access to the Fcb and enqueue the Irp if we didn't
|
||
// get access
|
||
//
|
||
|
||
if (!FatAcquireSharedFcb( IrpContext, Fcb )) {
|
||
|
||
Status = FatFsdPostRequest( IrpContext, Irp );
|
||
|
||
DebugTrace(-1, Dbg, "FatCommonLockControl -> %08lx\n", Status);
|
||
return Status;
|
||
}
|
||
|
||
_SEH2_TRY {
|
||
|
||
//
|
||
// We check whether we can proceed
|
||
// based on the state of the file oplocks.
|
||
//
|
||
|
||
#if (NTDDI_VERSION >= NTDDI_WIN8)
|
||
|
||
if (((IRP_MN_LOCK == IrpSp->MinorFunction) &&
|
||
((ULONGLONG)IrpSp->Parameters.LockControl.ByteOffset.QuadPart <
|
||
(ULONGLONG)Fcb->Header.AllocationSize.QuadPart)) ||
|
||
((IRP_MN_LOCK != IrpSp->MinorFunction) &&
|
||
FsRtlAreThereWaitingFileLocks( &Fcb->Specific.Fcb.FileLock ))) {
|
||
|
||
//
|
||
// Check whether we can proceed based on the state of file oplocks if doing
|
||
// an operation that interferes with oplocks. Those operations are:
|
||
//
|
||
// 1. Lock a range within the file's AllocationSize.
|
||
// 2. Unlock a range when there are waiting locks on the file. This one
|
||
// is not guaranteed to interfere with oplocks, but it could, as
|
||
// unlocking this range might cause a waiting lock to be granted
|
||
// within AllocationSize!
|
||
//
|
||
|
||
#endif
|
||
Status = FsRtlCheckOplock( FatGetFcbOplock(Fcb),
|
||
Irp,
|
||
IrpContext,
|
||
FatOplockComplete,
|
||
NULL );
|
||
|
||
#if (NTDDI_VERSION >= NTDDI_WIN8)
|
||
}
|
||
#endif
|
||
|
||
if (Status != STATUS_SUCCESS) {
|
||
|
||
OplockPostIrp = TRUE;
|
||
try_return( NOTHING );
|
||
}
|
||
|
||
//
|
||
// Now call the FsRtl routine to do the actual processing of the
|
||
// Lock request
|
||
//
|
||
|
||
Status = FsRtlProcessFileLock( &Fcb->Specific.Fcb.FileLock, Irp, NULL );
|
||
|
||
//
|
||
// Set the flag indicating if Fast I/O is possible
|
||
//
|
||
|
||
Fcb->Header.IsFastIoPossible = FatIsFastIoPossible( Fcb );
|
||
|
||
try_exit: NOTHING;
|
||
} _SEH2_FINALLY {
|
||
|
||
DebugUnwind( FatCommonLockControl );
|
||
|
||
//
|
||
// Only if this is not an abnormal termination do we delete the
|
||
// irp context
|
||
//
|
||
|
||
if (!_SEH2_AbnormalTermination() && !OplockPostIrp) {
|
||
|
||
FatCompleteRequest( IrpContext, FatNull, 0 );
|
||
}
|
||
|
||
//
|
||
// Release the Fcb, and return to our caller
|
||
//
|
||
|
||
FatReleaseFcb( IrpContext, Fcb );
|
||
|
||
DebugTrace(-1, Dbg, "FatCommonLockControl -> %08lx\n", Status);
|
||
} _SEH2_END;
|
||
|
||
return Status;
|
||
}
|
||
|