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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>
118 lines
5.7 KiB
C
118 lines
5.7 KiB
C
/*
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* storage_backend.h: internal storage driver backend contract
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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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#ifndef __VIR_STORAGE_BACKEND_H__
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# define __VIR_STORAGE_BACKEND_H__
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# include <sys/stat.h>
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# include "internal.h"
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# include "virstorageobj.h"
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# include "storage_driver.h"
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typedef char * (*virStorageBackendFindPoolSources)(const char *srcSpec,
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unsigned int flags);
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typedef int (*virStorageBackendCheckPool)(virStoragePoolObjPtr pool,
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bool *active);
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typedef int (*virStorageBackendStartPool)(virStoragePoolObjPtr pool);
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typedef int (*virStorageBackendBuildPool)(virStoragePoolObjPtr pool,
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unsigned int flags);
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typedef int (*virStorageBackendRefreshPool)(virStoragePoolObjPtr pool);
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typedef int (*virStorageBackendStopPool)(virStoragePoolObjPtr pool);
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typedef int (*virStorageBackendDeletePool)(virStoragePoolObjPtr pool,
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unsigned int flags);
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/* A 'buildVol' backend must remove any volume created on error since
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* the storage driver does not distinguish whether the failure is due
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* to failure to create the volume, to reserve any space necessary for
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* the volume, to get data about the volume, to change it's accessibility,
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* etc. This avoids issues arising from a creation failure due to some
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* external action which created a volume of the same name that libvirt
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* was not aware of between checking the pool and the create attempt. It
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* also avoids extra round trips to just delete a file.
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*/
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typedef int (*virStorageBackendBuildVol)(virStoragePoolObjPtr pool,
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virStorageVolDefPtr vol,
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unsigned int flags);
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typedef int (*virStorageBackendCreateVol)(virStoragePoolObjPtr pool,
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virStorageVolDefPtr vol);
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typedef int (*virStorageBackendRefreshVol)(virStoragePoolObjPtr pool,
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virStorageVolDefPtr vol);
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typedef int (*virStorageBackendDeleteVol)(virStoragePoolObjPtr pool,
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virStorageVolDefPtr vol,
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unsigned int flags);
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typedef int (*virStorageBackendBuildVolFrom)(virStoragePoolObjPtr pool,
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virStorageVolDefPtr origvol,
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virStorageVolDefPtr newvol,
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unsigned int flags);
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typedef int (*virStorageBackendVolumeResize)(virStoragePoolObjPtr pool,
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virStorageVolDefPtr vol,
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unsigned long long capacity,
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unsigned int flags);
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typedef int (*virStorageBackendVolumeDownload)(virStoragePoolObjPtr obj,
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virStorageVolDefPtr vol,
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virStreamPtr stream,
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unsigned long long offset,
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unsigned long long length,
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unsigned int flags);
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typedef int (*virStorageBackendVolumeUpload)(virStoragePoolObjPtr obj,
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virStorageVolDefPtr vol,
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virStreamPtr stream,
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unsigned long long offset,
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unsigned long long len,
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unsigned int flags);
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typedef int (*virStorageBackendVolumeWipe)(virStoragePoolObjPtr pool,
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virStorageVolDefPtr vol,
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unsigned int algorithm,
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unsigned int flags);
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typedef struct _virStorageBackend virStorageBackend;
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typedef virStorageBackend *virStorageBackendPtr;
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/* Callbacks are optional unless documented otherwise; but adding more
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* callbacks provides better pool support. */
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struct _virStorageBackend {
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int type;
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virStorageBackendFindPoolSources findPoolSources;
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virStorageBackendCheckPool checkPool;
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virStorageBackendStartPool startPool;
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virStorageBackendBuildPool buildPool;
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virStorageBackendRefreshPool refreshPool; /* Must be non-NULL */
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virStorageBackendStopPool stopPool;
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virStorageBackendDeletePool deletePool;
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virStorageBackendBuildVol buildVol;
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virStorageBackendBuildVolFrom buildVolFrom;
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virStorageBackendCreateVol createVol;
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virStorageBackendRefreshVol refreshVol;
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virStorageBackendDeleteVol deleteVol;
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virStorageBackendVolumeResize resizeVol;
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virStorageBackendVolumeUpload uploadVol;
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virStorageBackendVolumeDownload downloadVol;
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virStorageBackendVolumeWipe wipeVol;
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};
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virStorageBackendPtr virStorageBackendForType(int type);
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int virStorageBackendDriversRegister(bool allmodules);
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int virStorageBackendRegister(virStorageBackendPtr backend);
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#endif /* __VIR_STORAGE_BACKEND_H__ */
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