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The storage driver backends are serving the public storage pools API, while the storage file backends are serving the internal QEMU driver and / or libvirt utility code. To prep for moving this storage file backend framework into the utility code, split out the backend definitions. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
193 lines
5.5 KiB
C
193 lines
5.5 KiB
C
/*
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* storage_backend.c: internal storage driver backend contract
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*
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* Copyright (C) 2007-2016 Red Hat, Inc.
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* Copyright (C) 2007-2008 Daniel P. Berrange
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Author: Daniel P. Berrange <berrange@redhat.com>
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*/
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#include <config.h>
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#include <string.h>
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#include <sys/stat.h>
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#include "datatypes.h"
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#include "virerror.h"
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#include "viralloc.h"
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#include "internal.h"
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#include "virstoragefile.h"
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#include "storage_backend.h"
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#include "virlog.h"
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#include "virfile.h"
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#include "configmake.h"
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#if WITH_STORAGE_LVM
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# include "storage_backend_logical.h"
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#endif
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#if WITH_STORAGE_ISCSI
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# include "storage_backend_iscsi.h"
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#endif
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#if WITH_STORAGE_SCSI
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# include "storage_backend_scsi.h"
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#endif
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#if WITH_STORAGE_MPATH
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# include "storage_backend_mpath.h"
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#endif
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#if WITH_STORAGE_DISK
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# include "storage_backend_disk.h"
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#endif
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#if WITH_STORAGE_DIR
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# include "storage_backend_fs.h"
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#endif
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#if WITH_STORAGE_RBD
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# include "storage_backend_rbd.h"
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#endif
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#if WITH_STORAGE_SHEEPDOG
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# include "storage_backend_sheepdog.h"
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#endif
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#if WITH_STORAGE_GLUSTER
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# include "storage_backend_gluster.h"
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#endif
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#if WITH_STORAGE_ZFS
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# include "storage_backend_zfs.h"
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#endif
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#if WITH_STORAGE_VSTORAGE
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# include "storage_backend_vstorage.h"
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#endif
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#define VIR_FROM_THIS VIR_FROM_STORAGE
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VIR_LOG_INIT("storage.storage_backend");
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#define VIR_STORAGE_BACKENDS_MAX 20
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static virStorageBackendPtr virStorageBackends[VIR_STORAGE_BACKENDS_MAX];
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static size_t virStorageBackendsCount;
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#define STORAGE_BACKEND_MODULE_DIR LIBDIR "/libvirt/storage-backend"
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static int
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virStorageDriverLoadBackendModule(const char *name,
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const char *regfunc,
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bool forceload)
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{
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char *modfile = NULL;
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int ret;
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if (!(modfile = virFileFindResourceFull(name,
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"libvirt_storage_backend_",
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".so",
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abs_topbuilddir "/src/.libs",
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STORAGE_BACKEND_MODULE_DIR,
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"LIBVIRT_STORAGE_BACKEND_DIR")))
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return 1;
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if ((ret = virDriverLoadModuleFull(modfile, regfunc, NULL)) != 0) {
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if (forceload) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("failed to load storage backend module '%s'"),
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name);
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ret = -1;
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}
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}
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VIR_FREE(modfile);
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return ret;
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}
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#define VIR_STORAGE_BACKEND_REGISTER(func, module) \
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if (virStorageDriverLoadBackendModule(module, #func, allbackends) < 0) \
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return -1
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int
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virStorageBackendDriversRegister(bool allbackends ATTRIBUTE_UNUSED)
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{
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#if WITH_STORAGE_DIR || WITH_STORAGE_FS
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VIR_STORAGE_BACKEND_REGISTER(virStorageBackendFsRegister, "fs");
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#endif
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#if WITH_STORAGE_LVM
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VIR_STORAGE_BACKEND_REGISTER(virStorageBackendLogicalRegister, "logical");
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#endif
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#if WITH_STORAGE_ISCSI
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VIR_STORAGE_BACKEND_REGISTER(virStorageBackendISCSIRegister, "iscsi");
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#endif
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#if WITH_STORAGE_SCSI
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VIR_STORAGE_BACKEND_REGISTER(virStorageBackendSCSIRegister, "scsi");
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#endif
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#if WITH_STORAGE_MPATH
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VIR_STORAGE_BACKEND_REGISTER(virStorageBackendMpathRegister, "mpath");
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#endif
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#if WITH_STORAGE_DISK
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VIR_STORAGE_BACKEND_REGISTER(virStorageBackendDiskRegister, "disk");
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#endif
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#if WITH_STORAGE_RBD
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VIR_STORAGE_BACKEND_REGISTER(virStorageBackendRBDRegister, "rbd");
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#endif
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#if WITH_STORAGE_SHEEPDOG
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VIR_STORAGE_BACKEND_REGISTER(virStorageBackendSheepdogRegister, "sheepdog");
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#endif
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#if WITH_STORAGE_GLUSTER
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VIR_STORAGE_BACKEND_REGISTER(virStorageBackendGlusterRegister, "gluster");
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#endif
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#if WITH_STORAGE_ZFS
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VIR_STORAGE_BACKEND_REGISTER(virStorageBackendZFSRegister, "zfs");
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#endif
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#if WITH_STORAGE_VSTORAGE
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VIR_STORAGE_BACKEND_REGISTER(virStorageBackendVstorageRegister, "vstorage");
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#endif
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return 0;
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}
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#undef VIR_STORAGE_BACKEND_REGISTER
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int
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virStorageBackendRegister(virStorageBackendPtr backend)
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{
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VIR_DEBUG("Registering storage backend '%s'",
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virStoragePoolTypeToString(backend->type));
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if (virStorageBackendsCount >= VIR_STORAGE_BACKENDS_MAX) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Too many drivers, cannot register storage backend '%s'"),
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virStoragePoolTypeToString(backend->type));
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return -1;
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}
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virStorageBackends[virStorageBackendsCount] = backend;
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virStorageBackendsCount++;
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return 0;
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}
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virStorageBackendPtr
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virStorageBackendForType(int type)
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{
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size_t i;
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for (i = 0; i < virStorageBackendsCount; i++)
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if (virStorageBackends[i]->type == type)
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return virStorageBackends[i];
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("missing backend for pool type %d (%s)"),
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type, NULLSTR(virStoragePoolTypeToString(type)));
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return NULL;
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}
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