You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
904 lines
22 KiB
904 lines
22 KiB
/*++
|
|
|
|
Copyright (c) 1991 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
LockCtrl.c
|
|
|
|
Abstract:
|
|
|
|
This module implements the File Lock Control routine for Ntfs called by the
|
|
dispatch driver.
|
|
|
|
Author:
|
|
|
|
Gary Kimura [GaryKi] 28-May-1991
|
|
|
|
Revision History:
|
|
|
|
--*/
|
|
|
|
#include "NtfsProc.h"
|
|
|
|
//
|
|
// The local debug trace level
|
|
//
|
|
|
|
#define Dbg (DEBUG_TRACE_LOCKCTRL)
|
|
|
|
#ifdef ALLOC_PRAGMA
|
|
#pragma alloc_text(PAGE, NtfsCommonLockControl)
|
|
#pragma alloc_text(PAGE, NtfsFastLock)
|
|
#pragma alloc_text(PAGE, NtfsFastUnlockAll)
|
|
#pragma alloc_text(PAGE, NtfsFastUnlockAllByKey)
|
|
#pragma alloc_text(PAGE, NtfsFastUnlockSingle)
|
|
#endif
|
|
|
|
|
|
NTSTATUS
|
|
NtfsFsdLockControl (
|
|
IN PVOLUME_DEVICE_OBJECT VolumeDeviceObject,
|
|
IN PIRP Irp
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine implements the FSD part of Lock Control.
|
|
|
|
Arguments:
|
|
|
|
VolumeDeviceObject - Supplies the volume device object where the
|
|
file exists
|
|
|
|
Irp - Supplies the Irp being processed
|
|
|
|
Return Value:
|
|
|
|
NTSTATUS - The FSD status for the IRP
|
|
|
|
--*/
|
|
|
|
{
|
|
TOP_LEVEL_CONTEXT TopLevelContext;
|
|
PTOP_LEVEL_CONTEXT ThreadTopLevelContext;
|
|
|
|
NTSTATUS Status = STATUS_SUCCESS;
|
|
PIRP_CONTEXT IrpContext = NULL;
|
|
|
|
ASSERT_IRP( Irp );
|
|
|
|
UNREFERENCED_PARAMETER( VolumeDeviceObject );
|
|
|
|
DebugTrace( +1, Dbg, ("NtfsFsdLockControl\n") );
|
|
|
|
//
|
|
// Call the common Lock Control routine
|
|
//
|
|
|
|
FsRtlEnterFileSystem();
|
|
|
|
ThreadTopLevelContext = NtfsInitializeTopLevelIrp( &TopLevelContext, FALSE, FALSE );
|
|
|
|
do {
|
|
|
|
try {
|
|
|
|
//
|
|
// We are either initiating this request or retrying it.
|
|
//
|
|
|
|
if (IrpContext == NULL) {
|
|
|
|
//
|
|
// Allocate and initialize the Irp.
|
|
//
|
|
|
|
NtfsInitializeIrpContext( Irp, CanFsdWait( Irp ), &IrpContext );
|
|
|
|
//
|
|
// Initialize the thread top level structure, if needed.
|
|
//
|
|
|
|
NtfsUpdateIrpContextWithTopLevel( IrpContext, ThreadTopLevelContext );
|
|
|
|
} else if (Status == STATUS_LOG_FILE_FULL) {
|
|
|
|
NtfsCheckpointForLogFileFull( IrpContext );
|
|
}
|
|
|
|
Status = NtfsCommonLockControl( IrpContext, Irp );
|
|
break;
|
|
|
|
} except(NtfsExceptionFilter( IrpContext, GetExceptionInformation() )) {
|
|
|
|
//
|
|
// We had some trouble trying to perform the requested
|
|
// operation, so we'll abort the I/O request with
|
|
// the error status that we get back from the
|
|
// execption code
|
|
//
|
|
|
|
Status = NtfsProcessException( IrpContext, Irp, GetExceptionCode() );
|
|
}
|
|
|
|
} while (Status == STATUS_CANT_WAIT ||
|
|
Status == STATUS_LOG_FILE_FULL);
|
|
|
|
ASSERT( IoGetTopLevelIrp() != (PIRP) &TopLevelContext );
|
|
FsRtlExitFileSystem();
|
|
|
|
//
|
|
// And return to our caller
|
|
//
|
|
|
|
DebugTrace( -1, Dbg, ("NtfsFsdLockControl -> %08lx\n", Status) );
|
|
|
|
return Status;
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
NtfsFastLock (
|
|
IN PFILE_OBJECT FileObject,
|
|
IN PLARGE_INTEGER FileOffset,
|
|
IN PLARGE_INTEGER Length,
|
|
PEPROCESS ProcessId,
|
|
ULONG Key,
|
|
BOOLEAN FailImmediately,
|
|
BOOLEAN ExclusiveLock,
|
|
OUT PIO_STATUS_BLOCK IoStatus,
|
|
IN PDEVICE_OBJECT DeviceObject
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This is a call back routine for doing the fast lock call.
|
|
|
|
Arguments:
|
|
|
|
FileObject - Supplies the file object used in this operation
|
|
|
|
FileOffset - Supplies the file offset used in this operation
|
|
|
|
Length - Supplies the length used in this operation
|
|
|
|
ProcessId - Supplies the process ID used in this operation
|
|
|
|
Key - Supplies the key used in this operation
|
|
|
|
FailImmediately - Indicates if the request should fail immediately
|
|
if the lock cannot be granted.
|
|
|
|
ExclusiveLock - Indicates if this is a request for an exclusive or
|
|
shared lock
|
|
|
|
IoStatus - Receives the Status if this operation is successful
|
|
|
|
Return Value:
|
|
|
|
BOOLEAN - TRUE if this operation completed and FALSE if caller
|
|
needs to take the long route.
|
|
|
|
--*/
|
|
|
|
{
|
|
BOOLEAN Results;
|
|
PSCB Scb;
|
|
PFCB Fcb;
|
|
BOOLEAN ResourceAcquired = FALSE;
|
|
|
|
UNREFERENCED_PARAMETER( DeviceObject );
|
|
|
|
PAGED_CODE();
|
|
|
|
DebugTrace( +1, Dbg, ("NtfsFastLock\n") );
|
|
|
|
//
|
|
// Decode the type of file object we're being asked to process and
|
|
// make sure that is is only a user file open.
|
|
//
|
|
|
|
if ((Scb = NtfsFastDecodeUserFileOpen( FileObject )) == NULL) {
|
|
|
|
IoStatus->Status = STATUS_INVALID_PARAMETER;
|
|
IoStatus->Information = 0;
|
|
|
|
DebugTrace( -1, Dbg, ("NtfsFastLock -> TRUE (STATUS_INVALID_PARAMETER)\n") );
|
|
return TRUE;
|
|
}
|
|
|
|
Fcb = Scb->Fcb;
|
|
|
|
//
|
|
// Acquire shared access to the Fcb this operation can always wait
|
|
//
|
|
|
|
FsRtlEnterFileSystem();
|
|
|
|
if (Scb->ScbType.Data.FileLock == NULL) {
|
|
|
|
(VOID) ExAcquireResourceExclusiveLite( Fcb->Resource, TRUE );
|
|
ResourceAcquired = TRUE;
|
|
|
|
} else {
|
|
|
|
//(VOID) ExAcquireResourceSharedLite( Fcb->Resource, TRUE );
|
|
}
|
|
|
|
try {
|
|
|
|
//
|
|
// We check whether we can proceed
|
|
// based on the state of the file oplocks.
|
|
//
|
|
|
|
if ((Scb->ScbType.Data.Oplock != NULL) &&
|
|
!FsRtlOplockIsFastIoPossible( &Scb->ScbType.Data.Oplock )) {
|
|
|
|
try_return( Results = FALSE );
|
|
}
|
|
|
|
//
|
|
// If we don't have a file lock, then get one now.
|
|
//
|
|
|
|
if (Scb->ScbType.Data.FileLock == NULL
|
|
&& !NtfsCreateFileLock( Scb, FALSE )) {
|
|
|
|
try_return( Results = FALSE );
|
|
}
|
|
|
|
//
|
|
// Now call the FsRtl routine to do the actual processing of the
|
|
// Lock request
|
|
//
|
|
|
|
if (Results = FsRtlFastLock( Scb->ScbType.Data.FileLock,
|
|
FileObject,
|
|
FileOffset,
|
|
Length,
|
|
ProcessId,
|
|
Key,
|
|
FailImmediately,
|
|
ExclusiveLock,
|
|
IoStatus,
|
|
NULL,
|
|
FALSE )) {
|
|
|
|
//
|
|
// Set the flag indicating if Fast I/O is questionable. We
|
|
// only change this flag is the current state is possible.
|
|
// Retest again after synchronizing on the header.
|
|
//
|
|
|
|
if (Scb->Header.IsFastIoPossible == FastIoIsPossible) {
|
|
|
|
NtfsAcquireFsrtlHeader( Scb );
|
|
Scb->Header.IsFastIoPossible = NtfsIsFastIoPossible( Scb );
|
|
NtfsReleaseFsrtlHeader( Scb );
|
|
}
|
|
}
|
|
|
|
try_exit: NOTHING;
|
|
} finally {
|
|
|
|
DebugUnwind( NtfsFastLock );
|
|
|
|
//
|
|
// Release the Fcb, and return to our caller
|
|
//
|
|
|
|
if (ResourceAcquired) {
|
|
ExReleaseResourceLite( Fcb->Resource );
|
|
}
|
|
|
|
FsRtlExitFileSystem();
|
|
|
|
DebugTrace( -1, Dbg, ("NtfsFastLock -> %08lx\n", Results) );
|
|
}
|
|
|
|
return Results;
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
NtfsFastUnlockSingle (
|
|
IN PFILE_OBJECT FileObject,
|
|
IN PLARGE_INTEGER FileOffset,
|
|
IN PLARGE_INTEGER Length,
|
|
PEPROCESS ProcessId,
|
|
ULONG Key,
|
|
OUT PIO_STATUS_BLOCK IoStatus,
|
|
IN PDEVICE_OBJECT DeviceObject
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This is a call back routine for doing the fast unlock single call.
|
|
|
|
Arguments:
|
|
|
|
FileObject - Supplies the file object used in this operation
|
|
|
|
FileOffset - Supplies the file offset used in this operation
|
|
|
|
Length - Supplies the length used in this operation
|
|
|
|
ProcessId - Supplies the process ID used in this operation
|
|
|
|
Key - Supplies the key used in this operation
|
|
|
|
Status - Receives the Status if this operation is successful
|
|
|
|
Return Value:
|
|
|
|
BOOLEAN - TRUE if this operation completed and FALSE if caller
|
|
needs to take the long route.
|
|
|
|
--*/
|
|
|
|
{
|
|
BOOLEAN Results;
|
|
PFCB Fcb;
|
|
PSCB Scb;
|
|
BOOLEAN ResourceAcquired = FALSE;
|
|
|
|
UNREFERENCED_PARAMETER( DeviceObject );
|
|
|
|
PAGED_CODE();
|
|
|
|
DebugTrace( +1, Dbg, ("NtfsFastUnlockSingle\n") );
|
|
|
|
IoStatus->Information = 0;
|
|
|
|
//
|
|
// Decode the type of file object we're being asked to process and
|
|
// make sure that is is only a user file open.
|
|
//
|
|
|
|
if ((Scb = NtfsFastDecodeUserFileOpen( FileObject )) == NULL) {
|
|
|
|
IoStatus->Status = STATUS_INVALID_PARAMETER;
|
|
|
|
DebugTrace( -1, Dbg, ("NtfsFastUnlockSingle -> TRUE (STATUS_INVALID_PARAMETER)\n") );
|
|
return TRUE;
|
|
}
|
|
|
|
Fcb = Scb->Fcb;
|
|
|
|
//
|
|
// Acquire exclusive access to the Fcb this operation can always wait
|
|
//
|
|
|
|
FsRtlEnterFileSystem();
|
|
|
|
if (Scb->ScbType.Data.FileLock == NULL) {
|
|
|
|
(VOID) ExAcquireResourceExclusiveLite( Fcb->Resource, TRUE );
|
|
ResourceAcquired = TRUE;
|
|
|
|
} else {
|
|
|
|
//(VOID) ExAcquireResourceSharedLite( Fcb->Resource, TRUE );
|
|
}
|
|
|
|
try {
|
|
|
|
//
|
|
// We check whether we can proceed based on the state of the file oplocks.
|
|
//
|
|
|
|
if ((Scb->ScbType.Data.Oplock != NULL) &&
|
|
!FsRtlOplockIsFastIoPossible( &Scb->ScbType.Data.Oplock )) {
|
|
|
|
try_return( Results = FALSE );
|
|
}
|
|
|
|
//
|
|
// If we don't have a file lock, then get one now.
|
|
//
|
|
|
|
if (Scb->ScbType.Data.FileLock == NULL
|
|
&& !NtfsCreateFileLock( Scb, FALSE )) {
|
|
|
|
try_return( Results = FALSE );
|
|
}
|
|
|
|
//
|
|
// Now call the FsRtl routine to do the actual processing of the
|
|
// Lock request. The call will always succeed.
|
|
//
|
|
|
|
Results = TRUE;
|
|
IoStatus->Status = FsRtlFastUnlockSingle( Scb->ScbType.Data.FileLock,
|
|
FileObject,
|
|
FileOffset,
|
|
Length,
|
|
ProcessId,
|
|
Key,
|
|
NULL,
|
|
FALSE );
|
|
|
|
//
|
|
// Set the flag indicating if Fast I/O is possible. We are
|
|
// only concerned if there are no longer any filelocks on this
|
|
// file.
|
|
//
|
|
|
|
if (!FsRtlAreThereCurrentFileLocks( Scb->ScbType.Data.FileLock ) &&
|
|
(Scb->Header.IsFastIoPossible != FastIoIsPossible)) {
|
|
|
|
NtfsAcquireFsrtlHeader( Scb );
|
|
Scb->Header.IsFastIoPossible = NtfsIsFastIoPossible( Scb );
|
|
NtfsReleaseFsrtlHeader( Scb );
|
|
}
|
|
|
|
try_exit: NOTHING;
|
|
} finally {
|
|
|
|
DebugUnwind( NtfsFastUnlockSingle );
|
|
|
|
//
|
|
// Release the Fcb, and return to our caller
|
|
//
|
|
|
|
if (ResourceAcquired) {
|
|
ExReleaseResourceLite( Fcb->Resource );
|
|
}
|
|
|
|
FsRtlExitFileSystem();
|
|
|
|
DebugTrace( -1, Dbg, ("NtfsFastUnlockSingle -> %08lx\n", Results) );
|
|
}
|
|
|
|
return Results;
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
NtfsFastUnlockAll (
|
|
IN PFILE_OBJECT FileObject,
|
|
PEPROCESS ProcessId,
|
|
OUT PIO_STATUS_BLOCK IoStatus,
|
|
IN PDEVICE_OBJECT DeviceObject
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This is a call back routine for doing the fast unlock all call.
|
|
|
|
Arguments:
|
|
|
|
FileObject - Supplies the file object used in this operation
|
|
|
|
ProcessId - Supplies the process ID used in this operation
|
|
|
|
Status - Receives the Status if this operation is successful
|
|
|
|
Return Value:
|
|
|
|
BOOLEAN - TRUE if this operation completed and FALSE if caller
|
|
needs to take the long route.
|
|
|
|
--*/
|
|
|
|
{
|
|
BOOLEAN Results;
|
|
IRP_CONTEXT IrpContext;
|
|
TYPE_OF_OPEN TypeOfOpen;
|
|
PVCB Vcb;
|
|
PFCB Fcb;
|
|
PSCB Scb;
|
|
PCCB Ccb;
|
|
|
|
UNREFERENCED_PARAMETER( DeviceObject );
|
|
|
|
PAGED_CODE();
|
|
|
|
DebugTrace( +1, Dbg, ("NtfsFastUnlockAll\n") );
|
|
|
|
IoStatus->Information = 0;
|
|
|
|
//
|
|
// Decode the type of file object we're being asked to process and
|
|
// make sure that is is only a user file open.
|
|
//
|
|
|
|
TypeOfOpen = NtfsDecodeFileObject( &IrpContext, FileObject, &Vcb, &Fcb, &Scb, &Ccb, FALSE );
|
|
|
|
if (TypeOfOpen != UserFileOpen) {
|
|
|
|
IoStatus->Status = STATUS_INVALID_PARAMETER;
|
|
IoStatus->Information = 0;
|
|
|
|
DebugTrace( -1, Dbg, ("NtfsFastUnlockAll -> TRUE (STATUS_INVALID_PARAMETER)\n") );
|
|
return TRUE;
|
|
}
|
|
|
|
//
|
|
// Acquire exclusive access to the Fcb this operation can always wait
|
|
//
|
|
|
|
FsRtlEnterFileSystem();
|
|
|
|
if (Scb->ScbType.Data.FileLock == NULL) {
|
|
|
|
(VOID) ExAcquireResourceExclusiveLite( Fcb->Resource, TRUE );
|
|
|
|
} else {
|
|
|
|
(VOID) ExAcquireResourceSharedLite( Fcb->Resource, TRUE );
|
|
}
|
|
|
|
try {
|
|
|
|
//
|
|
// We check whether we can proceed based on the state of the file oplocks.
|
|
//
|
|
|
|
if (!FsRtlOplockIsFastIoPossible( &Scb->ScbType.Data.Oplock )) {
|
|
|
|
try_return( Results = FALSE );
|
|
}
|
|
|
|
//
|
|
// If we don't have a file lock, then get one now.
|
|
//
|
|
|
|
if (Scb->ScbType.Data.FileLock == NULL
|
|
&& !NtfsCreateFileLock( Scb, FALSE )) {
|
|
|
|
try_return( Results = FALSE );
|
|
}
|
|
|
|
//
|
|
// Now call the FsRtl routine to do the actual processing of the
|
|
// Lock request. The call will always succeed.
|
|
//
|
|
|
|
Results = TRUE;
|
|
IoStatus->Status = FsRtlFastUnlockAll( Scb->ScbType.Data.FileLock,
|
|
FileObject,
|
|
ProcessId,
|
|
NULL );
|
|
|
|
//
|
|
// Set the flag indicating if Fast I/O is possible
|
|
//
|
|
|
|
NtfsAcquireFsrtlHeader( Scb );
|
|
Scb->Header.IsFastIoPossible = NtfsIsFastIoPossible( Scb );
|
|
NtfsReleaseFsrtlHeader( Scb );
|
|
|
|
try_exit: NOTHING;
|
|
} finally {
|
|
|
|
DebugUnwind( NtfsFastUnlockAll );
|
|
|
|
//
|
|
// Release the Fcb, and return to our caller
|
|
//
|
|
|
|
ExReleaseResourceLite( Fcb->Resource );
|
|
|
|
FsRtlExitFileSystem();
|
|
|
|
DebugTrace( -1, Dbg, ("NtfsFastUnlockAll -> %08lx\n", Results) );
|
|
}
|
|
|
|
return Results;
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
NtfsFastUnlockAllByKey (
|
|
IN PFILE_OBJECT FileObject,
|
|
PVOID ProcessId,
|
|
ULONG Key,
|
|
OUT PIO_STATUS_BLOCK IoStatus,
|
|
IN PDEVICE_OBJECT DeviceObject
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This is a call back routine for doing the fast unlock all by key call.
|
|
|
|
Arguments:
|
|
|
|
FileObject - Supplies the file object used in this operation
|
|
|
|
ProcessId - Supplies the process ID used in this operation
|
|
|
|
Key - Supplies the key used in this operation
|
|
|
|
Status - Receives the Status if this operation is successful
|
|
|
|
Return Value:
|
|
|
|
BOOLEAN - TRUE if this operation completed and FALSE if caller
|
|
needs to take the long route.
|
|
|
|
--*/
|
|
|
|
{
|
|
BOOLEAN Results;
|
|
IRP_CONTEXT IrpContext;
|
|
TYPE_OF_OPEN TypeOfOpen;
|
|
PVCB Vcb;
|
|
PFCB Fcb;
|
|
PSCB Scb;
|
|
PCCB Ccb;
|
|
|
|
UNREFERENCED_PARAMETER( DeviceObject );
|
|
|
|
PAGED_CODE();
|
|
|
|
DebugTrace( +1, Dbg, ("NtfsFastUnlockAllByKey\n") );
|
|
|
|
IoStatus->Information = 0;
|
|
|
|
//
|
|
// Decode the type of file object we're being asked to process and
|
|
// make sure that is is only a user file open.
|
|
//
|
|
|
|
TypeOfOpen = NtfsDecodeFileObject( &IrpContext, FileObject, &Vcb, &Fcb, &Scb, &Ccb, FALSE );
|
|
|
|
if (TypeOfOpen != UserFileOpen) {
|
|
|
|
IoStatus->Status = STATUS_INVALID_PARAMETER;
|
|
IoStatus->Information = 0;
|
|
|
|
DebugTrace( -1, Dbg, ("NtfsFastUnlockAllByKey -> TRUE (STATUS_INVALID_PARAMETER)\n") );
|
|
return TRUE;
|
|
}
|
|
|
|
//
|
|
// Acquire exclusive access to the Fcb this operation can always wait
|
|
//
|
|
|
|
FsRtlEnterFileSystem();
|
|
|
|
if (Scb->ScbType.Data.FileLock == NULL) {
|
|
|
|
(VOID) ExAcquireResourceExclusiveLite( Fcb->Resource, TRUE );
|
|
|
|
} else {
|
|
|
|
(VOID) ExAcquireResourceSharedLite( Fcb->Resource, TRUE );
|
|
}
|
|
|
|
try {
|
|
|
|
//
|
|
// We check whether we can proceed based on the state of the file oplocks.
|
|
//
|
|
|
|
if (!FsRtlOplockIsFastIoPossible( &Scb->ScbType.Data.Oplock )) {
|
|
|
|
try_return( Results = FALSE );
|
|
}
|
|
|
|
//
|
|
// If we don't have a file lock, then get one now.
|
|
//
|
|
|
|
if (Scb->ScbType.Data.FileLock == NULL
|
|
&& !NtfsCreateFileLock( Scb, FALSE )) {
|
|
|
|
try_return( Results = FALSE );
|
|
}
|
|
|
|
//
|
|
// Now call the FsRtl routine to do the actual processing of the
|
|
// Lock request. The call will always succeed.
|
|
//
|
|
|
|
Results = TRUE;
|
|
IoStatus->Status = FsRtlFastUnlockAllByKey( Scb->ScbType.Data.FileLock,
|
|
FileObject,
|
|
ProcessId,
|
|
Key,
|
|
NULL );
|
|
|
|
//
|
|
// Set the flag indicating if Fast I/O is possible
|
|
//
|
|
|
|
NtfsAcquireFsrtlHeader( Scb );
|
|
Scb->Header.IsFastIoPossible = NtfsIsFastIoPossible( Scb );
|
|
NtfsReleaseFsrtlHeader( Scb );
|
|
|
|
try_exit: NOTHING;
|
|
} finally {
|
|
|
|
DebugUnwind( NtfsFastUnlockAllByKey );
|
|
|
|
//
|
|
// Release the Fcb, and return to our caller
|
|
//
|
|
|
|
ExReleaseResourceLite( Fcb->Resource );
|
|
|
|
FsRtlExitFileSystem();
|
|
|
|
DebugTrace( -1, Dbg, ("NtfsFastUnlockAllByKey -> %08lx\n", Results) );
|
|
}
|
|
|
|
return Results;
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
NtfsCommonLockControl (
|
|
IN PIRP_CONTEXT IrpContext,
|
|
IN PIRP Irp
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This is the common routine for Lock Control called by both the fsd and fsp
|
|
threads.
|
|
|
|
Arguments:
|
|
|
|
Irp - Supplies the Irp to process
|
|
|
|
Return Value:
|
|
|
|
NTSTATUS - The return status for the operation
|
|
|
|
--*/
|
|
|
|
{
|
|
NTSTATUS Status;
|
|
PIO_STACK_LOCATION IrpSp;
|
|
PFILE_OBJECT FileObject;
|
|
|
|
TYPE_OF_OPEN TypeOfOpen;
|
|
PVCB Vcb;
|
|
PFCB Fcb;
|
|
PSCB Scb;
|
|
PCCB Ccb;
|
|
BOOLEAN FcbAcquired = FALSE;
|
|
|
|
BOOLEAN OplockPostIrp;
|
|
|
|
ASSERT_IRP_CONTEXT( IrpContext );
|
|
ASSERT_IRP( Irp );
|
|
ASSERT( FlagOn( IrpContext->TopLevelIrpContext->State, IRP_CONTEXT_STATE_OWNS_TOP_LEVEL ));
|
|
|
|
PAGED_CODE();
|
|
|
|
//
|
|
// Get a pointer to the current Irp stack location
|
|
//
|
|
|
|
IrpSp = IoGetCurrentIrpStackLocation( Irp );
|
|
|
|
DebugTrace( +1, Dbg, ("NtfsCommonLockControl\n") );
|
|
DebugTrace( 0, Dbg, ("IrpContext = %08lx\n", IrpContext) );
|
|
DebugTrace( 0, Dbg, ("Irp = %08lx\n", Irp) );
|
|
DebugTrace( 0, Dbg, ("MinorFunction = %08lx\n", IrpSp->MinorFunction) );
|
|
|
|
//
|
|
// Extract and decode the type of file object we're being asked to process
|
|
//
|
|
|
|
FileObject = IrpSp->FileObject;
|
|
TypeOfOpen = NtfsDecodeFileObject( IrpContext, FileObject, &Vcb, &Fcb, &Scb, &Ccb, TRUE );
|
|
|
|
//
|
|
// If the file is not a user file open then we reject the request
|
|
// as an invalid parameter
|
|
//
|
|
|
|
if (TypeOfOpen != UserFileOpen) {
|
|
|
|
NtfsCompleteRequest( IrpContext, Irp, STATUS_INVALID_PARAMETER );
|
|
|
|
DebugTrace( -1, Dbg, ("NtfsCommonLockControl -> STATUS_INVALID_PARAMETER\n") );
|
|
return STATUS_INVALID_PARAMETER;
|
|
}
|
|
|
|
//
|
|
// Acquire exclusive access to the Fcb
|
|
//
|
|
|
|
if (Scb->ScbType.Data.FileLock == NULL) {
|
|
|
|
NtfsAcquireExclusiveFcb( IrpContext, Fcb, Scb, 0 );
|
|
FcbAcquired = TRUE;
|
|
|
|
} else {
|
|
|
|
//NtfsAcquireSharedFcb( IrpContext, Fcb, Scb );
|
|
}
|
|
|
|
OplockPostIrp = FALSE;
|
|
|
|
try {
|
|
|
|
//
|
|
// We check whether we can proceed based on the state of the file oplocks.
|
|
// This call might post the irp for us.
|
|
//
|
|
|
|
Status = FsRtlCheckOplock( &Scb->ScbType.Data.Oplock,
|
|
Irp,
|
|
IrpContext,
|
|
NtfsOplockComplete,
|
|
NtfsPrePostIrp );
|
|
|
|
if (Status != STATUS_SUCCESS) {
|
|
|
|
OplockPostIrp = TRUE;
|
|
try_return( NOTHING );
|
|
}
|
|
|
|
//
|
|
// If we don't have a file lock, then get one now.
|
|
//
|
|
|
|
if (Scb->ScbType.Data.FileLock == NULL) {
|
|
|
|
NtfsCreateFileLock( Scb, TRUE );
|
|
}
|
|
|
|
//
|
|
// Now call the FsRtl routine to do the actual processing of the
|
|
// Lock request
|
|
//
|
|
|
|
Status = FsRtlProcessFileLock( Scb->ScbType.Data.FileLock, Irp, NULL );
|
|
|
|
//
|
|
// Set the flag indicating if Fast I/O is possible
|
|
//
|
|
|
|
NtfsAcquireFsrtlHeader( Scb );
|
|
Scb->Header.IsFastIoPossible = NtfsIsFastIoPossible( Scb );
|
|
NtfsReleaseFsrtlHeader( Scb );
|
|
|
|
try_exit: NOTHING;
|
|
} finally {
|
|
|
|
DebugUnwind( NtfsCommonLockControl );
|
|
|
|
//
|
|
// Only if this is not an abnormal termination and we did not post the irp
|
|
// do we delete the irp context
|
|
//
|
|
|
|
if (!OplockPostIrp) {
|
|
|
|
//
|
|
// Release the Fcb.
|
|
//
|
|
|
|
if (FcbAcquired) { NtfsReleaseFcb( IrpContext, Fcb ); }
|
|
|
|
if (!AbnormalTermination()) {
|
|
|
|
NtfsCompleteRequest( IrpContext, NULL, 0 );
|
|
}
|
|
}
|
|
|
|
DebugTrace( -1, Dbg, ("NtfsCommonLockControl -> %08lx\n", Status) );
|
|
}
|
|
|
|
return Status;
|
|
}
|