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/*
* storage_file_backend.h: internal storage source backend contract
*
* Copyright (C) 2007-2018 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <sys/stat.h>
#include "storage_source_conf.h"
/* ------- virStorageFile backends ------------ */
typedef struct _virStorageFileBackend virStorageFileBackend;
typedef struct _virStorageDriverData virStorageDriverData;
struct _virStorageDriverData {
virStorageFileBackend *backend;
void *priv;
uid_t uid;
gid_t gid;
};
typedef int
(*virStorageFileBackendInit)(virStorageSource *src);
typedef void
(*virStorageFileBackendDeinit)(virStorageSource *src);
typedef int
(*virStorageFileBackendCreate)(virStorageSource *src);
typedef int
(*virStorageFileBackendUnlink)(virStorageSource *src);
typedef int
(*virStorageFileBackendStat)(virStorageSource *src,
struct stat *st);
typedef ssize_t
(*virStorageFileBackendRead)(virStorageSource *src,
size_t offset,
size_t len,
char **buf);
typedef int
(*virStorageFileBackendAccess)(virStorageSource *src,
int mode);
typedef int
(*virStorageFileBackendChown)(const virStorageSource *src,
uid_t uid,
gid_t gid);
int virStorageFileBackendForType(int type,
int protocol,
bool required,
virStorageFileBackend **backend);
struct _virStorageFileBackend {
int type;
int protocol;
/* All storage file callbacks may be omitted if not implemented */
/* The following group of callbacks is expected to set a libvirt
* error on failure. */
virStorageFileBackendInit backendInit;
virStorageFileBackendDeinit backendDeinit;
virStorageFileBackendRead storageFileRead;
/* The following group of callbacks is expected to set errno
* and return -1 on error. No libvirt error shall be reported */
virStorageFileBackendCreate storageFileCreate;
virStorageFileBackendUnlink storageFileUnlink;
virStorageFileBackendStat storageFileStat;
virStorageFileBackendAccess storageFileAccess;
virStorageFileBackendChown storageFileChown;
};
int virStorageFileBackendRegister(virStorageFileBackend *backend);
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