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.
682 lines
15 KiB
682 lines
15 KiB
/*++
|
|
|
|
Copyright (c) 1989-2000 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
LockCtrl.c
|
|
|
|
Abstract:
|
|
|
|
This module implements the Lock Control routines for Cdfs called
|
|
by the Fsd/Fsp dispatch driver.
|
|
|
|
// @@BEGIN_DDKSPLIT
|
|
|
|
Author:
|
|
|
|
Brian Andrew [BrianAn] 01-July-1995
|
|
|
|
Revision History:
|
|
|
|
// @@END_DDKSPLIT
|
|
|
|
--*/
|
|
|
|
#include "CdProcs.h"
|
|
|
|
//
|
|
// The Bug check file id for this module
|
|
//
|
|
|
|
#define BugCheckFileId (CDFS_BUG_CHECK_LOCKCTRL)
|
|
|
|
#ifdef ALLOC_PRAGMA
|
|
#pragma alloc_text(PAGE, CdCommonLockControl)
|
|
#pragma alloc_text(PAGE, CdFastLock)
|
|
#pragma alloc_text(PAGE, CdFastUnlockAll)
|
|
#pragma alloc_text(PAGE, CdFastUnlockAllByKey)
|
|
#pragma alloc_text(PAGE, CdFastUnlockSingle)
|
|
#endif
|
|
|
|
|
|
NTSTATUS
|
|
CdCommonLockControl (
|
|
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 = IoGetCurrentIrpStackLocation( Irp );
|
|
|
|
TYPE_OF_OPEN TypeOfOpen;
|
|
PFCB Fcb;
|
|
PCCB Ccb;
|
|
|
|
PAGED_CODE();
|
|
|
|
//
|
|
// Extract and decode the type of file object we're being asked to process
|
|
//
|
|
|
|
TypeOfOpen = CdDecodeFileObject( IrpContext, IrpSp->FileObject, &Fcb, &Ccb );
|
|
|
|
//
|
|
// If the file is not a user file open then we reject the request
|
|
// as an invalid parameter
|
|
//
|
|
|
|
if (TypeOfOpen != UserFileOpen) {
|
|
|
|
CdCompleteRequest( IrpContext, Irp, STATUS_INVALID_PARAMETER );
|
|
return STATUS_INVALID_PARAMETER;
|
|
}
|
|
|
|
//
|
|
// We check whether we can proceed based on the state of the file oplocks.
|
|
// This call might post the irp for us.
|
|
//
|
|
|
|
Status = FsRtlCheckOplock( &Fcb->Oplock,
|
|
Irp,
|
|
IrpContext,
|
|
CdOplockComplete,
|
|
NULL );
|
|
|
|
//
|
|
// If we don't get success then the oplock package completed the request.
|
|
//
|
|
|
|
if (Status != STATUS_SUCCESS) {
|
|
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// Verify the Fcb.
|
|
//
|
|
|
|
CdVerifyFcbOperation( IrpContext, Fcb );
|
|
|
|
//
|
|
// If we don't have a file lock, then get one now.
|
|
//
|
|
|
|
if (Fcb->FileLock == NULL) { CdCreateFileLock( IrpContext, Fcb, TRUE ); }
|
|
|
|
//
|
|
// Now call the FsRtl routine to do the actual processing of the
|
|
// Lock request
|
|
//
|
|
|
|
Status = FsRtlProcessFileLock( Fcb->FileLock, Irp, NULL );
|
|
|
|
//
|
|
// Set the flag indicating if Fast I/O is possible
|
|
//
|
|
|
|
CdLockFcb( IrpContext, Fcb );
|
|
Fcb->IsFastIoPossible = CdIsFastIoPossible( Fcb );
|
|
CdUnlockFcb( IrpContext, Fcb );
|
|
|
|
//
|
|
// Complete the request.
|
|
//
|
|
|
|
CdCompleteRequest( IrpContext, NULL, Status );
|
|
return Status;
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
CdFastLock (
|
|
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 = FALSE;
|
|
|
|
PFCB Fcb;
|
|
TYPE_OF_OPEN TypeOfOpen;
|
|
|
|
PAGED_CODE();
|
|
|
|
ASSERT_FILE_OBJECT( FileObject );
|
|
|
|
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 = CdFastDecodeFileObject( FileObject, &Fcb );
|
|
|
|
if (TypeOfOpen != UserFileOpen) {
|
|
|
|
IoStatus->Status = STATUS_INVALID_PARAMETER;
|
|
return TRUE;
|
|
}
|
|
|
|
//
|
|
// Only deal with 'good' Fcb's.
|
|
//
|
|
|
|
if (!CdVerifyFcbOperation( NULL, Fcb )) {
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
FsRtlEnterFileSystem();
|
|
|
|
//
|
|
// Use a try-finally to facilitate cleanup.
|
|
//
|
|
|
|
try {
|
|
|
|
//
|
|
// We check whether we can proceed based on the state of the file oplocks.
|
|
//
|
|
|
|
if ((Fcb->Oplock != NULL) && !FsRtlOplockIsFastIoPossible( &Fcb->Oplock )) {
|
|
|
|
try_return( NOTHING );
|
|
}
|
|
|
|
//
|
|
// If we don't have a file lock, then get one now.
|
|
//
|
|
|
|
if ((Fcb->FileLock == NULL) && !CdCreateFileLock( NULL, Fcb, FALSE )) {
|
|
|
|
try_return( NOTHING );
|
|
}
|
|
|
|
//
|
|
// Now call the FsRtl routine to perform the lock request.
|
|
//
|
|
|
|
if (Results = FsRtlFastLock( Fcb->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 if the current state is possible.
|
|
// Retest again after synchronizing on the header.
|
|
//
|
|
|
|
if (Fcb->IsFastIoPossible == FastIoIsPossible) {
|
|
|
|
CdLockFcb( NULL, Fcb );
|
|
Fcb->IsFastIoPossible = CdIsFastIoPossible( Fcb );
|
|
CdUnlockFcb( NULL, Fcb );
|
|
}
|
|
}
|
|
|
|
try_exit: NOTHING;
|
|
} finally {
|
|
|
|
FsRtlExitFileSystem();
|
|
}
|
|
|
|
return Results;
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
CdFastUnlockSingle (
|
|
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 = FALSE;
|
|
TYPE_OF_OPEN TypeOfOpen;
|
|
PFCB Fcb;
|
|
|
|
PAGED_CODE();
|
|
|
|
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 = CdFastDecodeFileObject( FileObject, &Fcb );
|
|
|
|
if (TypeOfOpen != UserFileOpen) {
|
|
|
|
IoStatus->Status = STATUS_INVALID_PARAMETER;
|
|
return TRUE;
|
|
}
|
|
|
|
//
|
|
// Only deal with 'good' Fcb's.
|
|
//
|
|
|
|
if (!CdVerifyFcbOperation( NULL, Fcb )) {
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
//
|
|
// If there is no lock then return immediately.
|
|
//
|
|
|
|
if (Fcb->FileLock == NULL) {
|
|
|
|
IoStatus->Status = STATUS_RANGE_NOT_LOCKED;
|
|
return TRUE;
|
|
}
|
|
|
|
FsRtlEnterFileSystem();
|
|
|
|
try {
|
|
|
|
//
|
|
// We check whether we can proceed based on the state of the file oplocks.
|
|
//
|
|
|
|
if ((Fcb->Oplock != NULL) && !FsRtlOplockIsFastIoPossible( &Fcb->Oplock )) {
|
|
|
|
try_return( NOTHING );
|
|
}
|
|
|
|
//
|
|
// If we don't have a file lock, then get one now.
|
|
//
|
|
|
|
if ((Fcb->FileLock == NULL) && !CdCreateFileLock( NULL, Fcb, FALSE )) {
|
|
|
|
try_return( NOTHING );
|
|
}
|
|
|
|
//
|
|
// Now call the FsRtl routine to do the actual processing of the
|
|
// Lock request. The call will always succeed.
|
|
//
|
|
|
|
Results = TRUE;
|
|
IoStatus->Status = FsRtlFastUnlockSingle( Fcb->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( Fcb->FileLock ) &&
|
|
(Fcb->IsFastIoPossible != FastIoIsPossible)) {
|
|
|
|
CdLockFcb( IrpContext, Fcb );
|
|
Fcb->IsFastIoPossible = CdIsFastIoPossible( Fcb );
|
|
CdUnlockFcb( IrpContext, Fcb );
|
|
}
|
|
|
|
try_exit: NOTHING;
|
|
} finally {
|
|
|
|
FsRtlExitFileSystem();
|
|
}
|
|
|
|
return Results;
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
CdFastUnlockAll (
|
|
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 = FALSE;
|
|
TYPE_OF_OPEN TypeOfOpen;
|
|
PFCB Fcb;
|
|
|
|
PAGED_CODE();
|
|
|
|
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 = CdFastDecodeFileObject( FileObject, &Fcb );
|
|
|
|
if (TypeOfOpen != UserFileOpen) {
|
|
|
|
IoStatus->Status = STATUS_INVALID_PARAMETER;
|
|
return TRUE;
|
|
}
|
|
|
|
//
|
|
// Only deal with 'good' Fcb's.
|
|
//
|
|
|
|
if (!CdVerifyFcbOperation( NULL, Fcb )) {
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
//
|
|
// If there is no lock then return immediately.
|
|
//
|
|
|
|
if (Fcb->FileLock == NULL) {
|
|
|
|
IoStatus->Status = STATUS_RANGE_NOT_LOCKED;
|
|
return TRUE;
|
|
}
|
|
|
|
FsRtlEnterFileSystem();
|
|
|
|
try {
|
|
|
|
//
|
|
// We check whether we can proceed based on the state of the file oplocks.
|
|
//
|
|
|
|
if ((Fcb->Oplock != NULL) && !FsRtlOplockIsFastIoPossible( &Fcb->Oplock )) {
|
|
|
|
try_return( NOTHING );
|
|
}
|
|
|
|
//
|
|
// If we don't have a file lock, then get one now.
|
|
//
|
|
|
|
if ((Fcb->FileLock == NULL) && !CdCreateFileLock( NULL, Fcb, FALSE )) {
|
|
|
|
try_return( NOTHING );
|
|
}
|
|
|
|
//
|
|
// Now call the FsRtl routine to do the actual processing of the
|
|
// Lock request. The call will always succeed.
|
|
//
|
|
|
|
Results = TRUE;
|
|
IoStatus->Status = FsRtlFastUnlockAll( Fcb->FileLock,
|
|
FileObject,
|
|
ProcessId,
|
|
NULL );
|
|
|
|
|
|
//
|
|
// Set the flag indicating if Fast I/O is possible
|
|
//
|
|
|
|
CdLockFcb( IrpContext, Fcb );
|
|
Fcb->IsFastIoPossible = CdIsFastIoPossible( Fcb );
|
|
CdUnlockFcb( IrpContext, Fcb );
|
|
|
|
try_exit: NOTHING;
|
|
} finally {
|
|
|
|
FsRtlExitFileSystem();
|
|
}
|
|
|
|
return Results;
|
|
}
|
|
|
|
|
|
BOOLEAN
|
|
CdFastUnlockAllByKey (
|
|
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 = FALSE;
|
|
TYPE_OF_OPEN TypeOfOpen;
|
|
PFCB Fcb;
|
|
|
|
PAGED_CODE();
|
|
|
|
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 = CdFastDecodeFileObject( FileObject, &Fcb );
|
|
|
|
if (TypeOfOpen != UserFileOpen) {
|
|
|
|
IoStatus->Status = STATUS_INVALID_PARAMETER;
|
|
return TRUE;
|
|
}
|
|
|
|
//
|
|
// Only deal with 'good' Fcb's.
|
|
//
|
|
|
|
if (!CdVerifyFcbOperation( NULL, Fcb )) {
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
//
|
|
// If there is no lock then return immediately.
|
|
//
|
|
|
|
if (Fcb->FileLock == NULL) {
|
|
|
|
IoStatus->Status = STATUS_RANGE_NOT_LOCKED;
|
|
return TRUE;
|
|
}
|
|
|
|
FsRtlEnterFileSystem();
|
|
|
|
try {
|
|
|
|
//
|
|
// We check whether we can proceed based on the state of the file oplocks.
|
|
//
|
|
|
|
if ((Fcb->Oplock != NULL) && !FsRtlOplockIsFastIoPossible( &Fcb->Oplock )) {
|
|
|
|
try_return( NOTHING );
|
|
}
|
|
|
|
//
|
|
// If we don't have a file lock, then get one now.
|
|
//
|
|
|
|
if ((Fcb->FileLock == NULL) && !CdCreateFileLock( NULL, Fcb, FALSE )) {
|
|
|
|
try_return( NOTHING );
|
|
}
|
|
|
|
//
|
|
// Now call the FsRtl routine to do the actual processing of the
|
|
// Lock request. The call will always succeed.
|
|
//
|
|
|
|
Results = TRUE;
|
|
IoStatus->Status = FsRtlFastUnlockAllByKey( Fcb->FileLock,
|
|
FileObject,
|
|
ProcessId,
|
|
Key,
|
|
NULL );
|
|
|
|
|
|
//
|
|
// Set the flag indicating if Fast I/O is possible
|
|
//
|
|
|
|
CdLockFcb( IrpContext, Fcb );
|
|
Fcb->IsFastIoPossible = CdIsFastIoPossible( Fcb );
|
|
CdUnlockFcb( IrpContext, Fcb );
|
|
|
|
try_exit: NOTHING;
|
|
} finally {
|
|
|
|
FsRtlExitFileSystem();
|
|
}
|
|
|
|
return Results;
|
|
}
|
|
|
|
|