/*
* Copyright (c) 2020 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* $Id: //eng/vdo-releases/aluminum/src/c++/vdo/kernel/deviceRegistry.h#2 $
*/
#ifndef DEVICE_REGISTRY_H
#define DEVICE_REGISTRY_H
#include "kernelTypes.h"
/**
* Initialize the necessary structures for the device registry.
**/
void initializeDeviceRegistryOnce(void);
/**
* Add a layer to the device registry. The layer must not already exist in the
* registry.
*
* @param layer The layer to add
*
* @return VDO_SUCCESS or an error
**/
int addLayerToDeviceRegistry(KernelLayer *layer)
__attribute__((warn_unused_result));
/**
* Remove a layer from the device registry.
*
* @param layer The layer to remove
**/
void removeLayerFromDeviceRegistry(KernelLayer *layer);
/**
* Find and return the first (if any) layer matching a given filter function.
*
* @param filter The filter function to apply to layers
* @param context A bit of context to provide the filter.
**/
KernelLayer *findLayerMatching(LayerFilter *filter, void *context);
#endif // DEVICE_REGISTRY_H