6b573efec8
Snapshots run also under the BQL, so they all are in the global state API. The aiocontext lock that they hold is currently an overkill and in future could be removed. Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com> Message-Id: <20220303151616.325444-23-eesposit@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
112 lines
4.6 KiB
C
112 lines
4.6 KiB
C
/*
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* Block layer snapshot related functions
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef SNAPSHOT_H
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#define SNAPSHOT_H
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#include "qapi/qapi-builtin-types.h"
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#define SNAPSHOT_OPT_BASE "snapshot."
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#define SNAPSHOT_OPT_ID "snapshot.id"
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#define SNAPSHOT_OPT_NAME "snapshot.name"
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extern QemuOptsList internal_snapshot_opts;
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typedef struct QEMUSnapshotInfo {
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char id_str[128]; /* unique snapshot id */
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/* the following fields are informative. They are not needed for
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the consistency of the snapshot */
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char name[256]; /* user chosen name */
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uint64_t vm_state_size; /* VM state info size */
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uint32_t date_sec; /* UTC date of the snapshot */
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uint32_t date_nsec;
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uint64_t vm_clock_nsec; /* VM clock relative to boot */
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uint64_t icount; /* record/replay step */
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} QEMUSnapshotInfo;
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/*
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* Global state (GS) API. These functions run under the BQL.
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*
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* See include/block/block-global-state.h for more information about
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* the GS API.
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*/
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int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
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const char *name);
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bool bdrv_snapshot_find_by_id_and_name(BlockDriverState *bs,
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const char *id,
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const char *name,
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QEMUSnapshotInfo *sn_info,
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Error **errp);
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int bdrv_can_snapshot(BlockDriverState *bs);
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int bdrv_snapshot_create(BlockDriverState *bs,
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QEMUSnapshotInfo *sn_info);
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int bdrv_snapshot_goto(BlockDriverState *bs,
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const char *snapshot_id,
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Error **errp);
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int bdrv_snapshot_delete(BlockDriverState *bs,
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const char *snapshot_id,
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const char *name,
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Error **errp);
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int bdrv_snapshot_list(BlockDriverState *bs,
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QEMUSnapshotInfo **psn_info);
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int bdrv_snapshot_load_tmp(BlockDriverState *bs,
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const char *snapshot_id,
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const char *name,
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Error **errp);
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int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs,
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const char *id_or_name,
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Error **errp);
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/*
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* Group operations. All block drivers are involved.
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* These functions will properly handle dataplane (take aio_context_acquire
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* when appropriate for appropriate block drivers
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*/
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bool bdrv_all_can_snapshot(bool has_devices, strList *devices,
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Error **errp);
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int bdrv_all_delete_snapshot(const char *name,
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bool has_devices, strList *devices,
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Error **errp);
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int bdrv_all_goto_snapshot(const char *name,
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bool has_devices, strList *devices,
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Error **errp);
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int bdrv_all_has_snapshot(const char *name,
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bool has_devices, strList *devices,
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Error **errp);
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int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn,
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BlockDriverState *vm_state_bs,
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uint64_t vm_state_size,
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bool has_devices,
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strList *devices,
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Error **errp);
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BlockDriverState *bdrv_all_find_vmstate_bs(const char *vmstate_bs,
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bool has_devices, strList *devices,
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Error **errp);
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#endif
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