864 lines
22 KiB
C
864 lines
22 KiB
C
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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VerfySup.c
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Abstract:
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This module implements the Udfs Verification routines.
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Author:
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Dan Lovinger [DanLo] 18-July-1996
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Revision History:
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--*/
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#include "UdfProcs.h"
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// The Bug check file id for this module
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#define BugCheckFileId (UDFS_BUG_CHECK_VERFYSUP)
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// The local debug trace level
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#define Dbg (UDFS_DEBUG_LEVEL_VERFYSUP)
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, UdfVerifyFcbOperation)
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#pragma alloc_text(PAGE, UdfVerifyVcb)
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#endif
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NTSTATUS
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UdfPerformVerify (
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IN PIRP_CONTEXT IrpContext,
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IN PIRP Irp,
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IN PDEVICE_OBJECT DeviceToVerify
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)
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/*++
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Routine Description:
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This routines performs an IoVerifyVolume operation and takes the
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appropriate action. If the verify is successful then we send the originating
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Irp off to an Ex Worker Thread. This routine is called from the exception handler.
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No file system resources are held when this routine is called.
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Arguments:
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Irp - The irp to send off after all is well and done.
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Device - The real device needing verification.
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Return Value:
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None.
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--*/
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{
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PVCB Vcb;
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NTSTATUS Status = STATUS_SUCCESS;
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PIO_STACK_LOCATION IrpSp;
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ASSERT_IRP_CONTEXT( IrpContext );
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ASSERT_IRP( Irp );
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// Check if this Irp has a status of Verify required and if it does
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// then call the I/O system to do a verify.
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// Skip the IoVerifyVolume if this is a mount or verify request
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// itself. Trying a recursive mount will cause a deadlock with
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// the DeviceObject->DeviceLock.
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if ((IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL) &&
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((IrpContext->MinorFunction == IRP_MN_MOUNT_VOLUME) ||
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(IrpContext->MinorFunction == IRP_MN_VERIFY_VOLUME))) {
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return UdfFsdPostRequest( IrpContext, Irp );
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}
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// Extract a pointer to the Vcb from the VolumeDeviceObject.
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// Note that since we have specifically excluded mount,
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// requests, we know that IrpSp->DeviceObject is indeed a
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// volume device object.
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IrpSp = IoGetCurrentIrpStackLocation( Irp );
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Vcb = &CONTAINING_RECORD( IrpSp->DeviceObject,
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VOLUME_DEVICE_OBJECT,
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DeviceObject )->Vcb;
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// Check if the volume still thinks it needs to be verified,
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// if it doesn't then we can skip doing a verify because someone
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// else beat us to it.
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try {
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if (FlagOn( DeviceToVerify->Flags, DO_VERIFY_VOLUME )) {
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BOOLEAN AllowRawMount = FALSE;
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// We will allow Raw to mount this volume if we were doing a
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// an absolute DASD open.
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if ((IrpContext->MajorFunction == IRP_MJ_CREATE) &&
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(IrpSp->FileObject->FileName.Length == 0) &&
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(IrpSp->FileObject->RelatedFileObject == NULL)) {
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AllowRawMount = TRUE;
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}
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// If the IopMount in IoVerifyVolume did something, and
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// this is an absolute open, force a reparse.
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Status = IoVerifyVolume( DeviceToVerify, AllowRawMount );
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// If the verify operation completed it will return
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// either STATUS_SUCCESS or STATUS_WRONG_VOLUME, exactly.
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// If UdfVerifyVolume encountered an error during
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// processing, it will return that error. If we got
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// STATUS_WRONG_VOLUME from the verify, and our volume
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// is now mounted, commute the status to STATUS_SUCCESS.
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if ((Status == STATUS_WRONG_VOLUME) &&
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(Vcb->VcbCondition == VcbMounted)) {
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Status = STATUS_SUCCESS;
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}
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// Do a quick unprotected check here. The routine will do
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// a safe check. After here we can release the resource.
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// Note that if the volume really went away, we will be taking
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// the Reparse path.
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// If the device might need to go away then call our dismount routine.
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if (((Vcb->VcbCondition == VcbNotMounted) ||
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(Vcb->VcbCondition == VcbInvalid) ||
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(Vcb->VcbCondition == VcbDismountInProgress)) &&
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(Vcb->VcbReference <= Vcb->VcbResidualReference)) {
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UdfAcquireUdfData( IrpContext );
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UdfCheckForDismount( IrpContext, Vcb, FALSE );
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UdfReleaseUdfData( IrpContext );
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}
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// If this is a create and the verify succeeded then complete the
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// request with a REPARSE status.
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if ((IrpContext->MajorFunction == IRP_MJ_CREATE) &&
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(IrpSp->FileObject->RelatedFileObject == NULL) &&
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((Status == STATUS_SUCCESS) || (Status == STATUS_WRONG_VOLUME))) {
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Irp->IoStatus.Information = IO_REMOUNT;
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UdfCompleteRequest( IrpContext, Irp, STATUS_REPARSE );
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Status = STATUS_REPARSE;
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Irp = NULL;
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IrpContext = NULL;
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// If there is still an error to process then call the Io system
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// for a popup.
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} else if ((Irp != NULL) && !NT_SUCCESS( Status )) {
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// Fill in the device object if required.
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if (IoIsErrorUserInduced( Status ) ) {
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IoSetHardErrorOrVerifyDevice( Irp, DeviceToVerify );
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}
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UdfNormalizeAndRaiseStatus( IrpContext, Status );
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}
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}
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// If there is still an Irp, send it off to an Ex Worker thread.
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if (IrpContext != NULL) {
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Status = UdfFsdPostRequest( IrpContext, Irp );
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}
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} except(UdfExceptionFilter( IrpContext, GetExceptionInformation() )) {
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// We had some trouble trying to perform the verify or raised
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// an error ourselves. So we'll abort the I/O request with
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// the error status that we get back from the execption code.
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Status = UdfProcessException( IrpContext, Irp, GetExceptionCode() );
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}
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return Status;
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}
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BOOLEAN
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UdfCheckForDismount (
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IN PIRP_CONTEXT IrpContext,
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IN PVCB Vcb,
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IN BOOLEAN Force
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)
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/*++
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Routine Description:
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This routine is called to check if a volume is ready for dismount. This
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occurs when only file system references are left on the volume.
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If the dismount is not currently underway and the user reference count
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has gone to zero then we can begin the dismount.
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If the dismount is in progress and there are no references left on the
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volume (we check the Vpb for outstanding references as well to catch
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any create calls dispatched to the file system) then we can delete
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the Vcb.
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Arguments:
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Vcb - Vcb for the volume to try to dismount.
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Force - Whether we will force this volume to be dismounted.
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Return Value:
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BOOLEAN - True if the Vcb was not gone by the time this function finished,
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False if it was deleted.
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This is only a trustworthy indication to the caller if it had the vcb
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exclusive itself.
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--*/
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{
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BOOLEAN UnlockVcb = TRUE;
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BOOLEAN VcbPresent = TRUE;
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KIRQL SavedIrql;
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ASSERT_IRP_CONTEXT( IrpContext );
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ASSERT_VCB( Vcb );
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ASSERT_EXCLUSIVE_UDFDATA;
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// Acquire and lock this Vcb to check the dismount state.
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UdfAcquireVcbExclusive( IrpContext, Vcb, FALSE );
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// Lets get rid of any pending closes for this volume.
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UdfFspClose( Vcb );
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UdfLockVcb( IrpContext, Vcb );
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// If the dismount is not already underway then check if the
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// user reference count has gone to zero or we are being forced
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// to disconnect. If so start the teardown on the Vcb.
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if (Vcb->VcbCondition != VcbDismountInProgress) {
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if (Vcb->VcbUserReference <= Vcb->VcbResidualUserReference || Force) {
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UdfUnlockVcb( IrpContext, Vcb );
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UnlockVcb = FALSE;
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VcbPresent = UdfDismountVcb( IrpContext, Vcb );
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}
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// If the teardown is underway and there are absolutely no references
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// remaining then delete the Vcb. References here include the
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// references in the Vcb and Vpb.
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} else if (Vcb->VcbReference == 0) {
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IoAcquireVpbSpinLock( &SavedIrql );
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// If there are no file objects and no reference counts in the
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// Vpb we can delete the Vcb. Don't forget that we have the
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// last reference in the Vpb.
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if (Vcb->Vpb->ReferenceCount == 1) {
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IoReleaseVpbSpinLock( SavedIrql );
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UdfUnlockVcb( IrpContext, Vcb );
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UnlockVcb = FALSE;
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UdfDeleteVcb( IrpContext, Vcb );
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VcbPresent = FALSE;
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} else {
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IoReleaseVpbSpinLock( SavedIrql );
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}
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}
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// Unlock the Vcb if still held.
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if (UnlockVcb) {
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UdfUnlockVcb( IrpContext, Vcb );
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}
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// Release any resources still acquired.
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if (VcbPresent) {
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UdfReleaseVcb( IrpContext, Vcb );
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}
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return VcbPresent;
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}
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BOOLEAN
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UdfDismountVcb (
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IN PIRP_CONTEXT IrpContext,
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IN PVCB Vcb
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)
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/*++
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Routine Description:
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This routine is called when all of the user references to a volume are
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gone. We will initiate all of the teardown any system resources.
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If all of the references to this volume are gone at the end of this routine
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then we will complete the teardown of this Vcb and mark the current Vpb
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as not mounted. Otherwise we will allocated a new Vpb for this device
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and keep the current Vpb attached to the Vcb.
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Arguments:
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Vcb - Vcb for the volume to dismount.
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Return Value:
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BOOLEAN - TRUE if we didn't delete the Vcb, FALSE otherwise.
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--*/
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{
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PVPB OldVpb;
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PVPB NewVpb;
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BOOLEAN VcbPresent = TRUE;
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KIRQL SavedIrql;
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BOOLEAN FinalReference;
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ASSERT_EXCLUSIVE_UDFDATA;
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ASSERT_EXCLUSIVE_VCB( Vcb );
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UdfLockVcb( IrpContext, Vcb );
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// We should only take this path once.
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ASSERT( Vcb->VcbCondition != VcbDismountInProgress );
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// Mark the Vcb as DismountInProgress.
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Vcb->VcbCondition = VcbDismountInProgress;
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// Remove our reference to the internal Fcb's. The Fcb's will then
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// be removed in the purge path below.
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if (Vcb->RootIndexFcb != NULL) {
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Vcb->RootIndexFcb->FcbReference -= 1;
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Vcb->RootIndexFcb->FcbUserReference -= 1;
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}
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if (Vcb->MetadataFcb != NULL) {
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Vcb->MetadataFcb->FcbReference -= 1;
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Vcb->MetadataFcb->FcbUserReference -= 1;
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}
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if (Vcb->VatFcb != NULL) {
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Vcb->VatFcb->FcbReference -= 1;
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Vcb->VatFcb->FcbUserReference -= 1;
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}
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if (Vcb->VolumeDasdFcb != NULL) {
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Vcb->VolumeDasdFcb->FcbReference -= 1;
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Vcb->VolumeDasdFcb->FcbUserReference -= 1;
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}
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UdfUnlockVcb( IrpContext, Vcb );
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// Purge the volume.
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UdfPurgeVolume( IrpContext, Vcb, TRUE );
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// Empty the delayed and async close queues.
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UdfFspClose( Vcb );
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// Allocate a new Vpb in case we will need it.
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NewVpb = ExAllocatePoolWithTag( NonPagedPoolMustSucceed, sizeof( VPB ), TAG_VPB );
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RtlZeroMemory( NewVpb, sizeof( VPB ) );
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OldVpb = Vcb->Vpb;
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// Remove the mount volume reference.
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UdfLockVcb( IrpContext, Vcb );
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Vcb->VcbReference -= 1;
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// Acquire the Vpb spinlock to check for Vpb references.
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IoAcquireVpbSpinLock( &SavedIrql );
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// Remember if this is the last reference on this Vcb. We incremented
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// the count on the Vpb earlier so we get one last crack it. If our
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// reference has gone to zero but the vpb reference count is greater
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// than zero then the Io system will be responsible for deleting the
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// Vpb.
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FinalReference = (BOOLEAN) ((Vcb->VcbReference == 0) &&
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(OldVpb->ReferenceCount == 1));
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// There is a reference count in the Vpb and in the Vcb. We have
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// incremented the reference count in the Vpb to make sure that
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// we have last crack at it. If this is a failed mount then we
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// want to return the Vpb to the IO system to use for the next
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// mount request.
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if (OldVpb->RealDevice->Vpb == OldVpb) {
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// If not the final reference then swap out the Vpb. We must
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// preserve the REMOVE_PENDING flag so that the device is
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// not remounted in the middle of a PnP remove operation.
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if (!FinalReference) {
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NewVpb->Type = IO_TYPE_VPB;
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NewVpb->Size = sizeof( VPB );
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NewVpb->RealDevice = OldVpb->RealDevice;
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NewVpb->RealDevice->Vpb = NewVpb;
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NewVpb->Flags = FlagOn( OldVpb->Flags, VPB_REMOVE_PENDING );
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NewVpb = NULL;
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IoReleaseVpbSpinLock( SavedIrql );
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UdfUnlockVcb( IrpContext, Vcb );
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// We want to leave the Vpb for the IO system. Mark it
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// as being not mounted. Go ahead and delete the Vcb as
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// well.
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} else {
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// Make sure to remove the last reference on the Vpb.
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OldVpb->ReferenceCount -= 1;
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OldVpb->DeviceObject = NULL;
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ClearFlag( Vcb->Vpb->Flags, VPB_MOUNTED );
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// Clear the Vpb flag so we know not to delete it.
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Vcb->Vpb = NULL;
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IoReleaseVpbSpinLock( SavedIrql );
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UdfUnlockVcb( IrpContext, Vcb );
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UdfDeleteVcb( IrpContext, Vcb );
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VcbPresent = FALSE;
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}
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// Someone has already swapped in a new Vpb. If this is the final reference
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// then the file system is responsible for deleting the Vpb.
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} else if (FinalReference) {
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// Make sure to remove the last reference on the Vpb.
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OldVpb->ReferenceCount -= 1;
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IoReleaseVpbSpinLock( SavedIrql );
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UdfUnlockVcb( IrpContext, Vcb );
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UdfDeleteVcb( IrpContext, Vcb );
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VcbPresent = FALSE;
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// The current Vpb is no longer the Vpb for the device (the IO system
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// has already allocated a new one). We leave our reference in the
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// Vpb and will be responsible for deleting it at a later time.
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} else {
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OldVpb->DeviceObject = NULL;
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ClearFlag( Vcb->Vpb->Flags, VPB_MOUNTED );
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IoReleaseVpbSpinLock( SavedIrql );
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UdfUnlockVcb( IrpContext, Vcb );
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}
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// Deallocate the new Vpb if we don't need it.
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if (NewVpb != NULL) {
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UdfFreePool( &NewVpb );
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}
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// Let our caller know whether the Vcb is still present.
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return VcbPresent;
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}
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VOID
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UdfVerifyVcb (
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IN PIRP_CONTEXT IrpContext,
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IN PVCB Vcb
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)
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/*++
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Routine Description:
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This routine checks that the current Vcb is valid and currently mounted
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on the device. It will raise on an error condition.
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We check whether the volume needs verification and the current state
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of the Vcb.
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Arguments:
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Vcb - This is the volume to verify.
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Return Value:
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None
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--*/
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{
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NTSTATUS Status;
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IO_STATUS_BLOCK Iosb;
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ULONG MediaChangeCount = 0;
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PAGED_CODE();
|
|
|
|
|
|
// Fail immediately if the volume is in the progress of being dismounted
|
|
// or has been marked invalid.
|
|
|
|
|
|
if ((Vcb->VcbCondition == VcbInvalid) ||
|
|
(Vcb->VcbCondition == VcbDismountInProgress)) {
|
|
|
|
UdfRaiseStatus( IrpContext, STATUS_FILE_INVALID );
|
|
}
|
|
|
|
|
|
// If the media is removable and the verify volume flag in the
|
|
// device object is not set then we want to ping the device
|
|
// to see if it needs to be verified
|
|
|
|
|
|
if ((Vcb->VcbCondition != VcbMountInProgress) &&
|
|
FlagOn( Vcb->VcbState, VCB_STATE_REMOVABLE_MEDIA ) &&
|
|
!FlagOn( Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME )) {
|
|
|
|
Status = UdfPerformDevIoCtrl( IrpContext,
|
|
( Vcb->Vpb->RealDevice->DeviceType == FILE_DEVICE_CD_ROM ?
|
|
IOCTL_CDROM_CHECK_VERIFY :
|
|
IOCTL_DISK_CHECK_VERIFY ),
|
|
Vcb->TargetDeviceObject,
|
|
&MediaChangeCount,
|
|
sizeof(ULONG),
|
|
FALSE,
|
|
FALSE,
|
|
&Iosb );
|
|
|
|
if (Iosb.Information != sizeof(ULONG)) {
|
|
|
|
|
|
// Be safe about the count in case the driver didn't fill it in
|
|
|
|
|
|
MediaChangeCount = 0;
|
|
}
|
|
|
|
|
|
// If the volume is now an empty device, or we have receieved a
|
|
// bare STATUS_VERIFY_REQUIRED (various hardware conditions such
|
|
// as bus resets, etc., will trigger this in the drivers), or the
|
|
// media change count has moved since we last inspected the device,
|
|
// then mark the volume to be verified.
|
|
|
|
|
|
if ((Vcb->VcbCondition == VcbMounted &&
|
|
UdfIsRawDevice( IrpContext, Status )) ||
|
|
(Status == STATUS_VERIFY_REQUIRED) ||
|
|
(NT_SUCCESS(Status) &&
|
|
(Vcb->MediaChangeCount != MediaChangeCount))) {
|
|
|
|
SetFlag( Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME );
|
|
|
|
|
|
// If the volume is not mounted and we got a media change count,
|
|
// update the Vcb so we do not trigger a verify again at this
|
|
// count value. If the verify->mount path detects that the media
|
|
// has actually changed and this Vcb is valid again, this will have
|
|
// done nothing. We are already synchronized since the caller has
|
|
// the Vcb.
|
|
|
|
|
|
if ((Vcb->VcbCondition == VcbNotMounted) &&
|
|
NT_SUCCESS(Status)) {
|
|
|
|
Vcb->MediaChangeCount = MediaChangeCount;
|
|
}
|
|
|
|
|
|
// Raise the error condition otherwise.
|
|
|
|
|
|
} else if (!NT_SUCCESS( Status )) {
|
|
|
|
UdfNormalizeAndRaiseStatus( IrpContext, Status );
|
|
}
|
|
|
|
}
|
|
|
|
|
|
// The Vcb may be mounted but the underlying real device may need to be verified.
|
|
// If it does then we'll set the Iosb in the irp to be our real device
|
|
// and raise Verify required
|
|
|
|
|
|
if (FlagOn( Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME )) {
|
|
|
|
IoSetHardErrorOrVerifyDevice( IrpContext->Irp,
|
|
Vcb->Vpb->RealDevice );
|
|
|
|
UdfRaiseStatus( IrpContext, STATUS_VERIFY_REQUIRED );
|
|
}
|
|
|
|
|
|
// Based on the condition of the Vcb we'll either return to our
|
|
// caller or raise an error condition
|
|
|
|
|
|
switch (Vcb->VcbCondition) {
|
|
|
|
case VcbNotMounted:
|
|
|
|
SetFlag( Vcb->Vpb->RealDevice->Flags, DO_VERIFY_VOLUME );
|
|
|
|
IoSetHardErrorOrVerifyDevice( IrpContext->Irp, Vcb->Vpb->RealDevice );
|
|
|
|
UdfRaiseStatus( IrpContext, STATUS_WRONG_VOLUME );
|
|
break;
|
|
|
|
case VcbInvalid:
|
|
case VcbDismountInProgress :
|
|
|
|
UdfRaiseStatus( IrpContext, STATUS_FILE_INVALID );
|
|
break;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
|
|
BOOLEAN
|
|
UdfVerifyFcbOperation (
|
|
IN PIRP_CONTEXT IrpContext OPTIONAL,
|
|
IN PFCB Fcb
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine is called to verify that the state of the Fcb is valid
|
|
to allow the current operation to continue. We use the state of the
|
|
Vcb, target device and type of operation to determine this.
|
|
|
|
Arguments:
|
|
|
|
IrpContext - IrpContext for the request. If not present then we
|
|
were called from the fast IO path.
|
|
|
|
Fcb - Fcb to perform the request on.
|
|
|
|
Return Value:
|
|
|
|
BOOLEAN - TRUE if the request can continue, FALSE otherwise.
|
|
|
|
--*/
|
|
|
|
{
|
|
NTSTATUS Status = STATUS_SUCCESS;
|
|
PVCB Vcb = Fcb->Vcb;
|
|
PDEVICE_OBJECT RealDevice = Vcb->Vpb->RealDevice;
|
|
|
|
PAGED_CODE();
|
|
|
|
|
|
// Fail immediately if the volume is in the progress of being dismounted
|
|
// or has been marked invalid.
|
|
|
|
|
|
if ((Vcb->VcbCondition == VcbInvalid) ||
|
|
(Vcb->VcbCondition == VcbDismountInProgress)) {
|
|
|
|
if (ARGUMENT_PRESENT( IrpContext )) {
|
|
|
|
UdfRaiseStatus( IrpContext, STATUS_FILE_INVALID );
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
// Always fail if the volume needs to be verified.
|
|
|
|
|
|
if (FlagOn( RealDevice->Flags, DO_VERIFY_VOLUME )) {
|
|
|
|
if (ARGUMENT_PRESENT( IrpContext )) {
|
|
|
|
IoSetHardErrorOrVerifyDevice( IrpContext->Irp,
|
|
RealDevice );
|
|
|
|
UdfRaiseStatus( IrpContext, STATUS_VERIFY_REQUIRED );
|
|
}
|
|
|
|
return FALSE;
|
|
|
|
|
|
// All operations are allowed on mounted volumes.
|
|
|
|
|
|
} else if ((Vcb->VcbCondition == VcbMounted) ||
|
|
(Vcb->VcbCondition == VcbMountInProgress)) {
|
|
|
|
return TRUE;
|
|
|
|
|
|
// Fail all requests for fast Io on other Vcb conditions.
|
|
|
|
|
|
} else if (!ARGUMENT_PRESENT( IrpContext )) {
|
|
|
|
return FALSE;
|
|
|
|
|
|
// The remaining case is VcbNotMounted.
|
|
// Mark the device to be verified and raise WRONG_VOLUME.
|
|
|
|
|
|
} else if (Vcb->VcbCondition == VcbNotMounted) {
|
|
|
|
if (ARGUMENT_PRESENT( IrpContext )) {
|
|
|
|
SetFlag(RealDevice->Flags, DO_VERIFY_VOLUME);
|
|
|
|
IoSetHardErrorOrVerifyDevice( IrpContext->Irp, RealDevice );
|
|
UdfRaiseStatus( IrpContext, STATUS_WRONG_VOLUME );
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|