VOID
CdCloseWorker (
IN PDEVICE_OBJECT DeviceObject,
IN PVOID Context
)
/*++
Routine Description:
Worker routine to call CsFspClose.
Arguments:
DeviceObject - Filesystem registration device object
Context - Callers context
Return Value:
None
--*/
{
CdFspClose (NULL);
}
VOID
NTAPI /* ReactOS Change: GCC Does not support STDCALL by default */
CdCloseWorker (
_In_ PDEVICE_OBJECT DeviceObject,
_In_opt_ PVOID Context
)
/*++
Routine Description:
Worker routine to call CsFspClose.
Arguments:
DeviceObject - Filesystem registration device object
Context - Callers context
Return Value:
None
--*/
{
PAGED_CODE();
UNREFERENCED_PARAMETER( DeviceObject );
UNREFERENCED_PARAMETER( Context );
CdFspClose (NULL);
}
BOOLEAN
CdDismountVcb (
IN PIRP_CONTEXT IrpContext,
IN PVCB Vcb
)
/*++
Routine Description:
This routine is called when all of the user references to a volume are
gone. We will initiate all of the teardown any system resources.
If all of the references to this volume are gone at the end of this routine
then we will complete the teardown of this Vcb and mark the current Vpb
as not mounted. Otherwise we will allocated a new Vpb for this device
and keep the current Vpb attached to the Vcb.
Arguments:
Vcb - Vcb for the volume to dismount.
Return Value:
BOOLEAN - TRUE if we didn't delete the Vcb, FALSE otherwise.
--*/
{
PVPB OldVpb;
BOOLEAN VcbPresent = TRUE;
KIRQL SavedIrql;
BOOLEAN FinalReference;
ASSERT_EXCLUSIVE_CDDATA;
ASSERT_EXCLUSIVE_VCB( Vcb );
CdLockVcb( IrpContext, Vcb );
//
// We should only take this path once.
//
ASSERT( Vcb->VcbCondition != VcbDismountInProgress );
//
// Mark the Vcb as DismountInProgress.
//
Vcb->VcbCondition = VcbDismountInProgress;
if (Vcb->XASector != NULL) {
CdFreePool( &Vcb->XASector );
Vcb->XASector = 0;
Vcb->XADiskOffset = 0;
}
//
// Remove our reference to the internal Fcb's. The Fcb's will then
// be removed in the purge path below.
//
if (Vcb->RootIndexFcb != NULL) {
Vcb->RootIndexFcb->FcbReference -= 1;
Vcb->RootIndexFcb->FcbUserReference -= 1;
}
if (Vcb->PathTableFcb != NULL) {
Vcb->PathTableFcb->FcbReference -= 1;
Vcb->PathTableFcb->FcbUserReference -= 1;
}
if (Vcb->VolumeDasdFcb != NULL) {
Vcb->VolumeDasdFcb->FcbReference -= 1;
Vcb->VolumeDasdFcb->FcbUserReference -= 1;
}
CdUnlockVcb( IrpContext, Vcb );
//
// Purge the volume.
//
CdPurgeVolume( IrpContext, Vcb, TRUE );
//
// Empty the delayed and async close queues.
//
CdFspClose( Vcb );
OldVpb = Vcb->Vpb;
//
// Remove the mount volume reference.
//
CdLockVcb( IrpContext, Vcb );
Vcb->VcbReference -= 1;
//
// Acquire the Vpb spinlock to check for Vpb references.
//
IoAcquireVpbSpinLock( &SavedIrql );
//
// Remember if this is the last reference on this Vcb. We incremented
// the count on the Vpb earlier so we get one last crack it. If our
// reference has gone to zero but the vpb reference count is greater
// than zero then the Io system will be responsible for deleting the
// Vpb.
//
FinalReference = (BOOLEAN) ((Vcb->VcbReference == 0) &&
(OldVpb->ReferenceCount == 1));
//
// There is a reference count in the Vpb and in the Vcb. We have
// incremented the reference count in the Vpb to make sure that
// we have last crack at it. If this is a failed mount then we
// want to return the Vpb to the IO system to use for the next
// mount request.
//
if (OldVpb->RealDevice->Vpb == OldVpb) {
//
// If not the final reference then swap out the Vpb. We must
// preserve the REMOVE_PENDING flag so that the device is
// not remounted in the middle of a PnP remove operation.
//
if (!FinalReference) {
ASSERT( Vcb->SwapVpb != NULL );
Vcb->SwapVpb->Type = IO_TYPE_VPB;
Vcb->SwapVpb->Size = sizeof( VPB );
Vcb->SwapVpb->RealDevice = OldVpb->RealDevice;
Vcb->SwapVpb->RealDevice->Vpb = Vcb->SwapVpb;
Vcb->SwapVpb->Flags = FlagOn( OldVpb->Flags, VPB_REMOVE_PENDING );
IoReleaseVpbSpinLock( SavedIrql );
//
// Indicate we used up the swap.
//
Vcb->SwapVpb = NULL;
CdUnlockVcb( IrpContext, Vcb );
//
// We want to leave the Vpb for the IO system. Mark it
// as being not mounted. Go ahead and delete the Vcb as
// well.
//
} else {
//
// Make sure to remove the last reference on the Vpb.
//
OldVpb->ReferenceCount -= 1;
OldVpb->DeviceObject = NULL;
ClearFlag( Vcb->Vpb->Flags, VPB_MOUNTED );
ClearFlag( Vcb->Vpb->Flags, VPB_LOCKED );
//
// Clear the Vpb flag so we know not to delete it.
//
Vcb->Vpb = NULL;
IoReleaseVpbSpinLock( SavedIrql );
CdUnlockVcb( IrpContext, Vcb );
CdDeleteVcb( IrpContext, Vcb );
VcbPresent = FALSE;
}
//
// Someone has already swapped in a new Vpb. If this is the final reference
// then the file system is responsible for deleting the Vpb.
//
} else if (FinalReference) {
//
// Make sure to remove the last reference on the Vpb.
//
OldVpb->ReferenceCount -= 1;
IoReleaseVpbSpinLock( SavedIrql );
CdUnlockVcb( IrpContext, Vcb );
CdDeleteVcb( IrpContext, Vcb );
VcbPresent = FALSE;
//
// The current Vpb is no longer the Vpb for the device (the IO system
// has already allocated a new one). We leave our reference in the
// Vpb and will be responsible for deleting it at a later time.
//
} else {
IoReleaseVpbSpinLock( SavedIrql );
CdUnlockVcb( IrpContext, Vcb );
}
//
// Let our caller know whether the Vcb is still present.
//
return VcbPresent;
}
BOOLEAN
CdCheckForDismount (
IN PIRP_CONTEXT IrpContext,
IN PVCB Vcb,
IN BOOLEAN Force
)
/*++
Routine Description:
This routine is called to check if a volume is ready for dismount. This
occurs when only file system references are left on the volume.
If the dismount is not currently underway and the user reference count
has gone to zero then we can begin the dismount.
If the dismount is in progress and there are no references left on the
volume (we check the Vpb for outstanding references as well to catch
any create calls dispatched to the file system) then we can delete
the Vcb.
Arguments:
Vcb - Vcb for the volume to try to dismount.
Force - Whether we will force this volume to be dismounted.
Return Value:
BOOLEAN - True if the Vcb was not gone by the time this function finished,
False if it was deleted.
This is only a trustworthy indication to the caller if it had the vcb
exclusive itself.
--*/
{
BOOLEAN UnlockVcb = TRUE;
BOOLEAN VcbPresent = TRUE;
KIRQL SavedIrql;
ASSERT_IRP_CONTEXT( IrpContext );
ASSERT_VCB( Vcb );
ASSERT_EXCLUSIVE_CDDATA;
//
// Acquire and lock this Vcb to check the dismount state.
//
CdAcquireVcbExclusive( IrpContext, Vcb, FALSE );
//
// Lets get rid of any pending closes for this volume.
//
CdFspClose( Vcb );
CdLockVcb( IrpContext, Vcb );
//
// If the dismount is not already underway then check if the
// user reference count has gone to zero or we are being forced
// to disconnect. If so start the teardown on the Vcb.
//
if (Vcb->VcbCondition != VcbDismountInProgress) {
if (Vcb->VcbUserReference <= CDFS_RESIDUAL_USER_REFERENCE || Force) {
CdUnlockVcb( IrpContext, Vcb );
UnlockVcb = FALSE;
VcbPresent = CdDismountVcb( IrpContext, Vcb );
}
//
// If the teardown is underway and there are absolutely no references
// remaining then delete the Vcb. References here include the
// references in the Vcb and Vpb.
//
} else if (Vcb->VcbReference == 0) {
IoAcquireVpbSpinLock( &SavedIrql );
//
// If there are no file objects and no reference counts in the
// Vpb we can delete the Vcb. Don't forget that we have the
// last reference in the Vpb.
//
if (Vcb->Vpb->ReferenceCount == 1) {
IoReleaseVpbSpinLock( SavedIrql );
CdUnlockVcb( IrpContext, Vcb );
UnlockVcb = FALSE;
CdDeleteVcb( IrpContext, Vcb );
VcbPresent = FALSE;
} else {
IoReleaseVpbSpinLock( SavedIrql );
}
}
//
// Unlock the Vcb if still held.
//
if (UnlockVcb) {
CdUnlockVcb( IrpContext, Vcb );
}
//
// Release any resources still acquired.
//
if (VcbPresent) {
CdReleaseVcb( IrpContext, Vcb );
}
return VcbPresent;
}
