/* $Id: HBDMgmt.h 62506 2016-07-22 19:09:44Z vboxsync $ */
/** @file
 * VBox storage devices: Host block device management API.
 */

/*
 * Copyright (C) 2015-2016 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 */
#ifndef __HBDMgmt_h
#define __HBDMgmt_h

#include <VBox/cdefs.h>

RT_C_DECLS_BEGIN

/**
 * Opaque host block device manager.
 */
typedef struct HBDMGRINT *HBDMGR;
/** Pointer to a block device manager. */
typedef HBDMGR *PHBDMGR;

/* NIL HBD manager handle. */
#define NIL_HBDMGR ((HBDMGR)0)

/**
 * Creates host block device manager.
 *
 * @returns VBox status code.
 * @param   phHbdMgr    Where to store the handle to the block device manager on success.
 */
DECLHIDDEN(int) HBDMgrCreate(PHBDMGR phHbdMgr);

/**
 * Destroys the given block device manager unclaiming all managed block devices.
 *
 * @returns nothing.
 * @param   hHbdMgr     The block device manager.
 */
DECLHIDDEN(void) HBDMgrDestroy(HBDMGR hHbdMgr);

/**
 * Returns whether a given filename resembles a block device which can
 * be managed by this API.
 *
 * @returns true if the given filename point to a block device manageable
 *                      by the given manager
 *              false otherwise.
 * @param   pszFilename The block device to check.
 */
DECLHIDDEN(bool) HBDMgrIsBlockDevice(const char *pszFilename);

/**
 * Prepares the given block device for use by unmounting and claiming it for exclusive use.
 *
 * @returns VBox status code.
 * @param   hHbdMgr     The block device manager.
 * @param   pszFilename The block device to claim.
 */
DECLHIDDEN(int) HBDMgrClaimBlockDevice(HBDMGR hHbdMgr, const char *pszFilename);

/**
 * Unclaims the given block device.
 *
 * @returns VBox status code.
 * @param   hHbdMgr     The block device manager.
 * @param   pszFilename The block device to unclaim.
 */
DECLHIDDEN(int) HBDMgrUnclaimBlockDevice(HBDMGR hHbdMgr, const char *pszFilename);

/**
 * Returns whether the given block device is claimed by the manager.
 *
 * @returns true if the block device is claimed, false otherwisw.
 * @param   hHbdMgr     The block device manager.
 * @param   pszFilename The block device to check.
 */
DECLHIDDEN(bool) HBDMgrIsBlockDeviceClaimed(HBDMGR hHbdMgr, const char *pszFilename);

RT_C_DECLS_END

#endif /* __HBDMgmt_h */