Windows Dev Center

ShouldBlockRevert function

Checks the registry for writers that should block revert operations on the specified volume.

Note  This function is only available on Windows Server operating systems.

Syntax


HRESULT ShouldBlockRevert(
  _In_  LPCWSTR wszVolumeName,
  _Out_ bool    *pbBlock
);

Parameters

wszVolumeName [in]

The name of the volume. This name must be in one of the following formats and must include a trailing backslash (\):

  • The path of a mounted folder, for example, Y:\MountX\
  • A drive letter, for example, D:\
  • A volume GUID path of the form \\?\Volume{GUID}\ (where GUID identifies the volume)
pbBlock [out]

A pointer to a variable that receives true if the volume contains components from any writers that are listed in the registry as writers that should block revert operations, or false otherwise.

Return value

This function can return one of these values.

ValueMeaning
S_OK

The function succeeded.

E_ACCESSDENIED

The caller is not an administrator.

E_INVALIDARG

One of the parameter values is not valid.

E_OUTOFMEMORY

The caller is out of memory or other system resources.

VSS_E_UNEXPECTED

Unexpected error. The error code is logged in the error log file. For more information, see Event and Error Handling Under VSS.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP:  This value is not supported until Windows Server 2008 R2 and Windows 7. E_UNEXPECTED is used instead.

 

Remarks

The list of writers that should block revert operations is stored in the registry under the following key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\VSS\Settings\WritersBlockingRevert

Requirements

Minimum supported client

None supported

Minimum supported server

Windows Server 2008, Windows Server 2003 with SP1 [desktop apps only]

Header

VsBackup.h (include VsBackup.h, Vss.h, or VsWriter.h)

Library

VssApi.lib

DLL

VssApi.dll

 

 

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