Blame source/vdo/base/vdoLoad.h

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/*
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 * Copyright (c) 2020 Red Hat, Inc.
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2
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 * of the License, or (at your option) any later version.
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 * 
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 * 
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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 * 02110-1301, USA. 
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 *
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 * $Id: //eng/vdo-releases/aluminum/src/c++/vdo/base/vdoLoad.h#3 $
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 */
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#ifndef VDO_LOAD_H
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#define VDO_LOAD_H
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#include "volumeGeometry.h"
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#include "types.h"
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/**
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 * A function which decodes a VDO from a super block.
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 *
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 * @param vdo             The VDO to be decoded (its super block must already
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 *                        be loaded)
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 * @param validateConfig  If true, the VDO's configuration will
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 *                        be validated before the decode is attempted
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 *
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 * @return VDO_SUCCESS or an error
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 **/
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typedef int VDODecoder(VDO *vdo, bool validateConfig);
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/**
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 * Load a VDO for normal operation. This method must not be called from a base
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 * thread.
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 *
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 * @param vdo         The VDO to load
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 *
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 * @return VDO_SUCCESS or an error
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 **/
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int performVDOLoad(VDO *vdo)
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  __attribute__((warn_unused_result));
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/**
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 * Perpare a VDO for loading by reading structures off disk. This method does
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 * not alter the on-disk state. It should be called from the VDO constructor,
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 * whereas performVDOLoad() will be called during pre-resume if the VDO has
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 * not been resumed before.
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 **/
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int prepareToLoadVDO(VDO *vdo, const VDOLoadConfig *loadConfig)
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  __attribute__((warn_unused_result));
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/**
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 * Synchronously load a VDO from a specified super block location for use by
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 * user-space tools.
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 *
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 * @param [in]  layer           The physical layer the VDO sits on
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 * @param [in]  geometry        A pointer to the geometry for the volume
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 * @param [in]  validateConfig  Whether to validate the VDO against the layer
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 * @param [in]  decoder         The VDO decoder to use, if NULL, the default
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 *                              decoder will be used
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 * @param [out] vdoPtr          A pointer to hold the decoded VDO
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 *
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 * @return VDO_SUCCESS or an error
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 **/
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int loadVDOSuperblock(PhysicalLayer   *layer,
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                      VolumeGeometry  *geometry,
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                      bool             validateConfig,
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                      VDODecoder      *decoder,
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                      VDO            **vdoPtr)
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  __attribute__((warn_unused_result));
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/**
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 * Synchronously load a VDO volume for use by user-space tools.
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 *
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 * @param [in]  layer           The physical layer the VDO sits on
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 * @param [in]  validateConfig  Whether to validate the VDO against the layer
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 * @param [in]  decoder         The VDO decoder to use, if NULL, the default
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 *                              decoder will be used
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 * @param [out] vdoPtr          A pointer to hold the decoded VDO
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 *
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 * @return VDO_SUCCESS or an error
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 **/
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int loadVDO(PhysicalLayer  *layer,
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            bool            validateConfig,
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            VDODecoder     *decoder,
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            VDO           **vdoPtr)
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  __attribute__((warn_unused_result));
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#endif /* VDO_LOAD_H */