Sample Code
Windows Driver Samples/ ClassPnP Storage Class Driver Library/ C++/ src/ create.c/
/*++
Copyright (C) Microsoft Corporation, 1991 - 2010
Module Name:
class.c
Abstract:
SCSI class driver routines
Environment:
kernel mode only
Notes:
Revision History:
--*/
#define CLASS_INIT_GUID 0
#include "classp.h"
#include "debug.h"
#ifdef DEBUG_USE_WPP
#include "create.tmh"
#endif
ULONG BreakOnClose = 0;
PCSZ LockTypeStrings[] = {
"Simple",
"Secure",
"Internal"
};
VOID
ClasspCleanupDisableMcn(
IN PFILE_OBJECT_EXTENSION FsContext
);
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, ClassCreateClose)
#pragma alloc_text(PAGE, ClasspCreateClose)
#pragma alloc_text(PAGE, ClasspCleanupProtectedLocks)
#pragma alloc_text(PAGE, ClasspEjectionControl)
#pragma alloc_text(PAGE, ClasspCleanupDisableMcn)
#pragma alloc_text(PAGE, ClassGetFsContext)
#endif
NTSTATUS
ClassCreateClose(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
SCSI class driver create and close routine. This is called by the I/O system
when the device is opened or closed.
Arguments:
DriverObject - Pointer to driver object created by system.
Irp - IRP involved.
Return Value:
Device-specific drivers return value or STATUS_SUCCESS.
--*/
{
PCOMMON_DEVICE_EXTENSION commonExtension = DeviceObject->DeviceExtension;
ULONG removeState;
NTSTATUS status;
PAGED_CODE();
//
// If we're getting a close request then we know the device object hasn't
// been completely destroyed. Let the driver cleanup if necessary.
//
removeState = ClassAcquireRemoveLock(DeviceObject, Irp);
//
// Invoke the device-specific routine, if one exists. Otherwise complete
// with SUCCESS
//
if((removeState == NO_REMOVE) ||
IS_CLEANUP_REQUEST(IoGetCurrentIrpStackLocation(Irp)->MajorFunction)) {
status = ClasspCreateClose(DeviceObject, Irp);
if((NT_SUCCESS(status)) &&
(commonExtension->DevInfo->ClassCreateClose)) {
return commonExtension->DevInfo->ClassCreateClose(DeviceObject, Irp);
}
} else {
status = STATUS_DEVICE_DOES_NOT_EXIST;
}
Irp->IoStatus.Status = status;
ClassReleaseRemoveLock(DeviceObject, Irp);
ClassCompleteRequest(DeviceObject, Irp, IO_NO_INCREMENT);
return status;
}
NTSTATUS
ClasspCreateClose(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
This routine will handle create/close operations for a given classpnp
device if the class driver doesn't supply it's own handler. If there
is a file object supplied for our driver (if it's a FO_DIRECT_DEVICE_OPEN
file object) then it will initialize a file extension on create or destroy
the extension on a close.
Arguments:
DeviceObject - the device object being opened or closed.
Irp - the create/close irp
Return Value:
status
--*/
{
PCOMMON_DEVICE_EXTENSION commonExtension = DeviceObject->DeviceExtension;
PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation(Irp);
PFILE_OBJECT fileObject = irpStack->FileObject;
NTSTATUS status = STATUS_SUCCESS;
PAGED_CODE();
//
// ISSUE-2000/3/28-henrygab - if lower stack fails create/close, we end up
// in an inconsistent state. re-write to verify all args and allocate all
// required resources, then pass the irp down, then complete the
// transaction. this is because we also cannot forward the irp, then fail
// it after it has succeeded a lower-level driver.
//
if(irpStack->MajorFunction == IRP_MJ_CREATE) {
PIO_SECURITY_CONTEXT securityContext =
irpStack->Parameters.Create.SecurityContext;
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_INIT,
"ClasspCREATEClose: create received for device %p\n",
DeviceObject));
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_INIT,
"ClasspCREATEClose: desired access %lx\n",
securityContext->DesiredAccess));
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_INIT,
"ClasspCREATEClose: file object %p\n",
irpStack->FileObject));
NT_ASSERT(BreakOnClose == FALSE);
if(irpStack->FileObject != NULL) {
PFILE_OBJECT_EXTENSION fsContext;
//
// Allocate our own file object extension for this device object.
//
status = AllocateDictionaryEntry(
&commonExtension->FileObjectDictionary,
(ULONGLONG) irpStack->FileObject,
sizeof(FILE_OBJECT_EXTENSION),
CLASS_TAG_FILE_OBJECT_EXTENSION,
&fsContext);
if(NT_SUCCESS(status)) {
RtlZeroMemory(fsContext,
sizeof(FILE_OBJECT_EXTENSION));
fsContext->FileObject = irpStack->FileObject;
fsContext->DeviceObject = DeviceObject;
} else if (status == STATUS_OBJECT_NAME_COLLISION) {
status = STATUS_SUCCESS;
}
}
} else {
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_INIT,
"ClasspCreateCLOSE: close received for device %p\n",
DeviceObject));
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_INIT,
"ClasspCreateCLOSE: file object %p\n",
fileObject));
if(irpStack->FileObject != NULL) {
PFILE_OBJECT_EXTENSION fsContext =
ClassGetFsContext(commonExtension, irpStack->FileObject);
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_INIT,
"ClasspCreateCLOSE: file extension %p\n",
fsContext));
if(fsContext != NULL) {
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_INIT,
"ClasspCreateCLOSE: extension is ours - "
"freeing\n"));
NT_ASSERT(BreakOnClose == FALSE);
ClasspCleanupProtectedLocks(fsContext);
ClasspCleanupDisableMcn(fsContext);
FreeDictionaryEntry(&(commonExtension->FileObjectDictionary),
fsContext);
}
}
}
//
// Notify the lower levels about the create or close operation - give them
// a chance to cleanup too.
//
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_INIT,
"ClasspCreateClose: %s for devobj %p\n",
(NT_SUCCESS(status) ? "Success" : "FAILED"),
DeviceObject));
if(NT_SUCCESS(status)) {
KEVENT event;
//
// Set up the event to wait on
//
KeInitializeEvent(&event, SynchronizationEvent, FALSE);
IoCopyCurrentIrpStackLocationToNext(Irp);
IoSetCompletionRoutine( Irp, ClassSignalCompletion, &event,
TRUE, TRUE, TRUE);
status = IoCallDriver(commonExtension->LowerDeviceObject, Irp);
if(status == STATUS_PENDING) {
(VOID)KeWaitForSingleObject(&event,
Executive,
KernelMode,
FALSE,
NULL);
status = Irp->IoStatus.Status;
}
if (!NT_SUCCESS(status)) {
TracePrint((TRACE_LEVEL_ERROR, TRACE_FLAG_INIT,
"ClasspCreateClose: Lower driver failed, but we "
"succeeded. This is a problem, lock counts will be "
"out of sync between levels.\n"));
}
}
return status;
}
VOID
ClasspCleanupProtectedLocks(
IN PFILE_OBJECT_EXTENSION FsContext
)
{
PCOMMON_DEVICE_EXTENSION commonExtension =
FsContext->DeviceObject->DeviceExtension;
PFUNCTIONAL_DEVICE_EXTENSION fdoExtension =
commonExtension->PartitionZeroExtension;
ULONG newDeviceLockCount = 1;
PAGED_CODE();
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_INIT,
"ClasspCleanupProtectedLocks called for %p\n",
FsContext->DeviceObject));
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_INIT,
"ClasspCleanupProtectedLocks - FsContext %p is locked "
"%d times\n", FsContext, FsContext->LockCount));
NT_ASSERT(BreakOnClose == FALSE);
//
// Synchronize with ejection and ejection control requests.
//
KeEnterCriticalRegion();
(VOID)KeWaitForSingleObject(&(fdoExtension->EjectSynchronizationEvent),
UserRequest,
KernelMode,
FALSE,
NULL);
//
// For each secure lock on this handle decrement the secured lock count
// for the FDO. Keep track of the new value.
//
if (FsContext->LockCount != 0) {
do {
InterlockedDecrement((volatile LONG *)&FsContext->LockCount);
newDeviceLockCount =
InterlockedDecrement(&fdoExtension->ProtectedLockCount);
} while (FsContext->LockCount > 0);
//
// If the new lock count has been dropped to zero then issue a lock
// command to the device.
//
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_INIT,
"ClasspCleanupProtectedLocks: FDO secured lock count = %d "
"lock count = %d\n",
fdoExtension->ProtectedLockCount,
fdoExtension->LockCount));
if ((newDeviceLockCount == 0) && (fdoExtension->LockCount == 0)) {
SCSI_REQUEST_BLOCK srb = {0};
UCHAR srbExBuffer[CLASS_SRBEX_SCSI_CDB16_BUFFER_SIZE] = {0};
PSTORAGE_REQUEST_BLOCK srbEx = (PSTORAGE_REQUEST_BLOCK)srbExBuffer;
PCDB cdb = NULL;
NTSTATUS status;
PSCSI_REQUEST_BLOCK srbPtr;
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_INIT,
"ClasspCleanupProtectedLocks: FDO lock count dropped "
"to zero\n"));
if (fdoExtension->AdapterDescriptor->SrbType == SRB_TYPE_STORAGE_REQUEST_BLOCK) {
#pragma prefast(suppress:26015, "InitializeStorageRequestBlock ensures buffer access is bounded")
status = InitializeStorageRequestBlock(srbEx,
STORAGE_ADDRESS_TYPE_BTL8,
sizeof(srbExBuffer),
1,
SrbExDataTypeScsiCdb16);
if (NT_SUCCESS(status)) {
srbEx->TimeOutValue = fdoExtension->TimeOutValue;
SrbSetCdbLength(srbEx, 6);
cdb = SrbGetCdb(srbEx);
srbPtr = (PSCSI_REQUEST_BLOCK)srbEx;
} else {
//
// Should not happen. Revert to legacy SRB.
//
NT_ASSERT(FALSE);
srb.TimeOutValue = fdoExtension->TimeOutValue;
srb.CdbLength = 6;
cdb = (PCDB) &(srb.Cdb);
srbPtr = &srb;
}
} else {
srb.TimeOutValue = fdoExtension->TimeOutValue;
srb.CdbLength = 6;
cdb = (PCDB) &(srb.Cdb);
srbPtr = &srb;
}
cdb->MEDIA_REMOVAL.OperationCode = SCSIOP_MEDIUM_REMOVAL;
//
// TRUE - prevent media removal.
// FALSE - allow media removal.
//
cdb->MEDIA_REMOVAL.Prevent = FALSE;
status = ClassSendSrbSynchronous(fdoExtension->DeviceObject,
srbPtr,
NULL,
0,
FALSE);
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_INIT,
"ClasspCleanupProtectedLocks: unlock request to drive "
"returned status %lx\n", status));
}
}
KeSetEvent(&fdoExtension->EjectSynchronizationEvent,
IO_NO_INCREMENT,
FALSE);
KeLeaveCriticalRegion();
return;
}
VOID
ClasspCleanupDisableMcn(
IN PFILE_OBJECT_EXTENSION FsContext
)
{
PCOMMON_DEVICE_EXTENSION commonExtension =
FsContext->DeviceObject->DeviceExtension;
PFUNCTIONAL_DEVICE_EXTENSION fdoExtension =
commonExtension->PartitionZeroExtension;
PAGED_CODE();
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_MCN,
"ClasspCleanupDisableMcn called for %p\n",
FsContext->DeviceObject));
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_MCN,
"ClasspCleanupDisableMcn - FsContext %p is disabled "
"%d times\n", FsContext, FsContext->McnDisableCount));
//
// For each secure lock on this handle decrement the secured lock count
// for the FDO. Keep track of the new value.
//
while(FsContext->McnDisableCount != 0) {
FsContext->McnDisableCount--;
ClassEnableMediaChangeDetection(fdoExtension);
}
return;
}
#if 1
/*
* ISSUE: REMOVE this old function implementation as soon as the
* boottime pagefile problems with the new one (below)
* are resolved.
*/
NTSTATUS
ClasspEjectionControl(
IN PDEVICE_OBJECT Fdo,
IN PIRP Irp,
IN MEDIA_LOCK_TYPE LockType,
IN BOOLEAN Lock
)
{
PFUNCTIONAL_DEVICE_EXTENSION FdoExtension = Fdo->DeviceExtension;
PCOMMON_DEVICE_EXTENSION commonExtension =
(PCOMMON_DEVICE_EXTENSION) FdoExtension;
PFILE_OBJECT_EXTENSION fsContext = NULL;
NTSTATUS status;
PSCSI_REQUEST_BLOCK srb = NULL;
BOOLEAN countChanged = FALSE;
PAGED_CODE();
/*
* Ensure that the user thread is not suspended while we are holding EjectSynchronizationEvent.
*/
KeEnterCriticalRegion();
status = KeWaitForSingleObject(
&(FdoExtension->EjectSynchronizationEvent),
UserRequest,
KernelMode,
FALSE,
NULL);
NT_ASSERT(status == STATUS_SUCCESS);
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_IOCTL,
"ClasspEjectionControl: "
"Received request for %s lock type\n",
LockTypeStrings[LockType]
));
try {
PCDB cdb = NULL;
//
// Determine if this is a "secured" request.
//
if (LockType == SecureMediaLock) {
PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation(Irp);
PFILE_OBJECT fileObject = irpStack->FileObject;
//
// Make sure that the file object we are supplied has a
// proper FsContext before we try doing a secured lock.
//
if (fileObject != NULL) {
fsContext = ClassGetFsContext(commonExtension, fileObject);
}
if (fsContext == NULL) {
//
// This handle isn't setup correctly. We can't let the
// operation go.
//
status = STATUS_INVALID_PARAMETER;
leave;
}
}
if (Lock) {
//
// This is a lock command. Reissue the command in case bus or
// device was reset and the lock was cleared.
// note: may need to decrement count if actual lock operation
// failed....
//
switch (LockType) {
case SimpleMediaLock: {
FdoExtension->LockCount++;
countChanged = TRUE;
break;
}
case SecureMediaLock: {
fsContext->LockCount++;
FdoExtension->ProtectedLockCount++;
countChanged = TRUE;
break;
}
case InternalMediaLock: {
FdoExtension->InternalLockCount++;
countChanged = TRUE;
break;
}
}
} else {
//
// This is an unlock command. If it's a secured one then make sure
// the caller has a lock outstanding or return an error.
// note: may need to re-increment the count if actual unlock
// operation fails....
//
switch (LockType) {
case SimpleMediaLock: {
if(FdoExtension->LockCount != 0) {
FdoExtension->LockCount--;
countChanged = TRUE;
}
break;
}
case SecureMediaLock: {
if(fsContext->LockCount == 0) {
status = STATUS_INVALID_DEVICE_STATE;
leave;
}
fsContext->LockCount--;
FdoExtension->ProtectedLockCount--;
countChanged = TRUE;
break;
}
case InternalMediaLock: {
NT_ASSERT(FdoExtension->InternalLockCount != 0);
FdoExtension->InternalLockCount--;
countChanged = TRUE;
break;
}
}
//
// We only send an unlock command to the drive if both the
// secured and unsecured lock counts have dropped to zero.
//
if ((FdoExtension->ProtectedLockCount != 0) ||
(FdoExtension->InternalLockCount != 0) ||
(FdoExtension->LockCount != 0)) {
status = STATUS_SUCCESS;
leave;
}
}
status = STATUS_SUCCESS;
if (TEST_FLAG(Fdo->Characteristics, FILE_REMOVABLE_MEDIA)) {
srb = (PSCSI_REQUEST_BLOCK)ClasspAllocateSrb(FdoExtension);
if (srb == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
leave;
}
if (FdoExtension->AdapterDescriptor->SrbType == SRB_TYPE_STORAGE_REQUEST_BLOCK) {
//
// NOTE - this is based on size used in ClasspAllocateSrb
//
status = InitializeStorageRequestBlock((PSTORAGE_REQUEST_BLOCK)srb,
STORAGE_ADDRESS_TYPE_BTL8,
CLASS_SRBEX_SCSI_CDB16_BUFFER_SIZE,
1,
SrbExDataTypeScsiCdb16);
if (!NT_SUCCESS(status)) {
NT_ASSERT(FALSE);
leave;
}
} else {
RtlZeroMemory(srb, sizeof(SCSI_REQUEST_BLOCK));
}
SrbSetCdbLength(srb, 6);
cdb = SrbGetCdb(srb);
NT_ASSERT(cdb != NULL);
cdb->MEDIA_REMOVAL.OperationCode = SCSIOP_MEDIUM_REMOVAL;
//
// TRUE - prevent media removal.
// FALSE - allow media removal.
//
cdb->MEDIA_REMOVAL.Prevent = Lock;
//
// Set timeout value.
//
SrbSetTimeOutValue(srb, FdoExtension->TimeOutValue);
//
// The actual lock operation on the device isn't so important
// as the internal lock counts. Ignore failures.
//
status = ClassSendSrbSynchronous(FdoExtension->DeviceObject,
srb,
NULL,
0,
FALSE);
}
} finally {
if (!NT_SUCCESS(status)) {
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_IOCTL,
"ClasspEjectionControl: FAILED status %x -- "
"reverting lock counts\n", status));
if (countChanged) {
//
// have to revert to previous counts if the
// lock/unlock operation actually failed.
//
if (Lock) {
switch (LockType) {
case SimpleMediaLock: {
FdoExtension->LockCount--;
break;
}
case SecureMediaLock: {
fsContext->LockCount--;
FdoExtension->ProtectedLockCount--;
break;
}
case InternalMediaLock: {
FdoExtension->InternalLockCount--;
break;
}
}
} else {
switch (LockType) {
case SimpleMediaLock: {
FdoExtension->LockCount++;
break;
}
case SecureMediaLock: {
fsContext->LockCount++;
FdoExtension->ProtectedLockCount++;
break;
}
case InternalMediaLock: {
FdoExtension->InternalLockCount++;
break;
}
}
}
}
} else {
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_IOCTL,
"ClasspEjectionControl: Succeeded\n"));
}
TracePrint((TRACE_LEVEL_INFORMATION, TRACE_FLAG_IOCTL,
"ClasspEjectionControl: "
"Current Counts: Internal: %x Secure: %x Simple: %x\n",
FdoExtension->InternalLockCount,
FdoExtension->ProtectedLockCount,
FdoExtension->LockCount
));
KeSetEvent(&(FdoExtension->EjectSynchronizationEvent),
IO_NO_INCREMENT,
FALSE);
KeLeaveCriticalRegion();
if (srb) {
ClassFreeOrReuseSrb(FdoExtension, srb);
}
}
return status;
}
#else
/*
* ISSUE: RESTORE this (see above)
* This is a new implementation of the function that doesn't thrash memory
* or depend on the srbLookasideList.
* HOWEVER, it seems to cause pagefile initialization to fail during boot
* for some reason. Need to resolve this before switching to this function.
*/
NTSTATUS
ClasspEjectionControl(
IN PDEVICE_OBJECT Fdo,
IN PIRP Irp,
IN MEDIA_LOCK_TYPE LockType,
IN BOOLEAN Lock
)
{
PFUNCTIONAL_DEVICE_EXTENSION fdoExt = Fdo->DeviceExtension;
PFILE_OBJECT_EXTENSION fsContext;
BOOLEAN fileHandleOk = TRUE;
BOOLEAN countChanged = FALSE;
NTSTATUS status;
PAGED_CODE();
status = KeWaitForSingleObject(
&fdoExt->EjectSynchronizationEvent,
UserRequest,
KernelMode,
FALSE,
NULL);
NT_ASSERT(status == STATUS_SUCCESS);
/*
* If this is a "secured" request, we have to make sure
* that the file handle is valid.
*/
if (LockType == SecureMediaLock){
PIO_STACK_LOCATION thisSp = IoGetCurrentIrpStackLocation(Irp);
/*
* Make sure that the file object we are supplied has a
* proper FsContext before we try doing a secured lock.
*/
if (thisSp->FileObject){
PCOMMON_DEVICE_EXTENSION commonExt = (PCOMMON_DEVICE_EXTENSION)fdoExt;
fsContext = ClassGetFsContext(commonExt, thisSp->FileObject);
}
else {
fsContext = NULL;
}
if (!fsContext){
NT_ASSERT(fsContext);
fileHandleOk = FALSE;
}
}
if (fileHandleOk){
/*
* Adjust the lock counts and make sure they make sense.
*/
status = STATUS_SUCCESS;
if (Lock){
switch(LockType) {
case SimpleMediaLock:
fdoExt->LockCount++;
countChanged = TRUE;
break;
case SecureMediaLock:
fsContext->LockCount++;
fdoExt->ProtectedLockCount++;
countChanged = TRUE;
break;
case InternalMediaLock:
fdoExt->InternalLockCount++;
countChanged = TRUE;
break;
}
}
else {
/*
* This is an unlock command. If it's a secured one then make sure
* the caller has a lock outstanding or return an error.
*/
switch (LockType){
case SimpleMediaLock:
if (fdoExt->LockCount > 0){
fdoExt->LockCount--;
countChanged = TRUE;
}
else {
NT_ASSERT(fdoExt->LockCount > 0);
status = STATUS_INTERNAL_ERROR;
}
break;
case SecureMediaLock:
if (fsContext->LockCount > 0){
NT_ASSERT(fdoExt->ProtectedLockCount > 0);
fsContext->LockCount--;
fdoExt->ProtectedLockCount--;
countChanged = TRUE;
}
else {
NT_ASSERT(fsContext->LockCount > 0);
status = STATUS_INVALID_DEVICE_STATE;
}
break;
case InternalMediaLock:
NT_ASSERT(fdoExt->InternalLockCount > 0);
fdoExt->InternalLockCount--;
countChanged = TRUE;
break;
}
}
if (NT_SUCCESS(status)){
/*
* We only send an unlock command to the drive if
* all the lock counts have dropped to zero.
*/
if (!Lock &&
(fdoExt->ProtectedLockCount ||
fdoExt->InternalLockCount ||
fdoExt->LockCount)){
/*
* The lock count is still positive, so don't unlock yet.
*/
status = STATUS_SUCCESS;
}
else if (!TEST_FLAG(Fdo->Characteristics, FILE_REMOVABLE_MEDIA)) {
/*
* The device isn't removable media. don't send a cmd.
*/
status = STATUS_SUCCESS;
}
else {
TRANSFER_PACKET *pkt;
pkt = DequeueFreeTransferPacket(Fdo, TRUE);
if (pkt){
KEVENT event;
/*
* Store the number of packets servicing the irp (one)
* inside the original IRP. It will be used to counted down
* to zero when the packet completes.
* Initialize the original IRP's status to success.
* If the packet fails, we will set it to the error status.
*/
Irp->Tail.Overlay.DriverContext[0] = LongToPtr(1);
Irp->IoStatus.Status = STATUS_SUCCESS;
/*
* Set this up as a SYNCHRONOUS transfer, submit it,
* and wait for the packet to complete. The result
* status will be written to the original irp.
*/
KeInitializeEvent(&event, SynchronizationEvent, FALSE);
SetupEjectionTransferPacket(pkt, Lock, &event, Irp);
SubmitTransferPacket(pkt);
(VOID)KeWaitForSingleObject(&event, Executive, KernelMode, FALSE, NULL);
status = Irp->IoStatus.Status;
}
else {
status = STATUS_INSUFFICIENT_RESOURCES;
}
}
}
}
else {
status = STATUS_INVALID_PARAMETER;
}
if (!NT_SUCCESS(status) && countChanged) {
//
// have to revert to previous counts if the
// lock/unlock operation actually failed.
//
if(Lock) {
switch(LockType) {
case SimpleMediaLock: {
FdoExtension->LockCount--;
break;
}
case SecureMediaLock: {
fsContext->LockCount--;
FdoExtension->ProtectedLockCount--;
break;
}
case InternalMediaLock: {
FdoExtension->InternalLockCount--;
break;
}
}
} else {
switch(LockType) {
case SimpleMediaLock: {
FdoExtension->LockCount++;
break;
}
case SecureMediaLock: {
fsContext->LockCount++;
FdoExtension->ProtectedLockCount++;
break;
}
case InternalMediaLock: {
FdoExtension->InternalLockCount++;
break;
}
}
}
}
KeSetEvent(&fdoExt->EjectSynchronizationEvent, IO_NO_INCREMENT, FALSE);
return status;
}
#endif
_IRQL_requires_max_(PASSIVE_LEVEL)
PFILE_OBJECT_EXTENSION
ClassGetFsContext(
_In_ PCOMMON_DEVICE_EXTENSION CommonExtension,
_In_ PFILE_OBJECT FileObject
)
{
PAGED_CODE();
return GetDictionaryEntry(&(CommonExtension->FileObjectDictionary),
(ULONGLONG) FileObject);
}
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