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/*
* storage_file_backend.c: internal storage source backend contract
*
* Copyright (C) 2007-2018 Red Hat, Inc.
* Copyright (C) 2007-2008 Daniel P. Berrange
*
* 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/>.
*/
#include <config.h>
#include <sys/stat.h>
#include "virerror.h"
#include "internal.h"
#include "storage_file_backend.h"
#include "virlog.h"
#include "virmodule.h"
#include "virfile.h"
#include "configmake.h"
#define VIR_FROM_THIS VIR_FROM_STORAGE
VIR_LOG_INIT("storage.storage_source_backend");
#define VIR_STORAGE_BACKENDS_MAX 20
static virStorageFileBackend *virStorageFileBackends[VIR_STORAGE_BACKENDS_MAX];
static size_t virStorageFileBackendsCount;
#if WITH_STORAGE_DIR || WITH_STORAGE_FS || WITH_STORAGE_GLUSTER
# define STORAGE_FILE_MODULE_DIR LIBDIR "/libvirt/storage-file"
static int
virStorageFileLoadBackendModule(const char *name,
const char *regfunc,
bool forceload)
{
g_autofree char *modfile = NULL;
int ret;
if (!(modfile = virFileFindResourceFull(name,
"libvirt_storage_file_",
VIR_FILE_MODULE_EXT,
abs_top_builddir "/src",
STORAGE_FILE_MODULE_DIR,
"LIBVIRT_STORAGE_FILE_DIR")))
return -1;
ret = virModuleLoad(modfile, regfunc, forceload);
return ret;
}
#endif /* WITH_STORAGE_DIR || WITH_STORAGE_FS || WITH_STORAGE_GLUSTER */
static int virStorageFileBackendOnceInit(void)
{
#if WITH_STORAGE_DIR || WITH_STORAGE_FS
if (virStorageFileLoadBackendModule("fs", "virStorageFileFsRegister", false) < 0)
return -1;
#endif /* WITH_STORAGE_DIR || WITH_STORAGE_FS */
#if WITH_STORAGE_GLUSTER
if (virStorageFileLoadBackendModule("gluster", "virStorageFileGlusterRegister", false) < 0)
return -1;
#endif /* WITH_STORAGE_GLUSTER */
return 0;
}
VIR_ONCE_GLOBAL_INIT(virStorageFileBackend);
int
virStorageFileBackendRegister(virStorageFileBackend *backend)
{
VIR_DEBUG("Registering storage file backend '%s' protocol '%s'",
virStorageTypeToString(backend->type),
virStorageNetProtocolTypeToString(backend->protocol));
if (virStorageFileBackendsCount >= VIR_STORAGE_BACKENDS_MAX) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Too many drivers, cannot register storage file backend '%1$s'"),
virStorageTypeToString(backend->type));
return -1;
}
virStorageFileBackends[virStorageFileBackendsCount] = backend;
virStorageFileBackendsCount++;
return 0;
}
int
virStorageFileBackendForType(int type,
int protocol,
bool required,
virStorageFileBackend **backend)
{
size_t i;
*backend = NULL;
if (virStorageFileBackendInitialize() < 0)
return -1;
for (i = 0; i < virStorageFileBackendsCount; i++) {
if (virStorageFileBackends[i]->type == type) {
if (type == VIR_STORAGE_TYPE_NETWORK &&
virStorageFileBackends[i]->protocol != protocol)
continue;
*backend = virStorageFileBackends[i];
return 0;
}
}
if (!required)
return 0;
if (type == VIR_STORAGE_TYPE_NETWORK) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("missing storage backend for network files using %1$s protocol"),
virStorageNetProtocolTypeToString(protocol));
} else {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("missing storage backend for '%1$s' storage"),
virStorageTypeToString(type));
}
return -1;
}
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