a32e781838
This adds GRAPH_RDLOCK annotations to declare that callers of bdrv_snapshot_fallback() need to hold a reader lock for the graph because it accesses the children list of a node. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-ID: <20230929145157.45443-8-kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
116 lines
4.5 KiB
C
116 lines
4.5 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 "block/graph-lock.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 GRAPH_RDLOCK bdrv_can_snapshot(BlockDriverState *bs);
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int GRAPH_RDLOCK
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bdrv_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
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int GRAPH_UNLOCKED
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bdrv_snapshot_goto(BlockDriverState *bs, const char *snapshot_id, Error **errp);
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int GRAPH_RDLOCK
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bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id,
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const char *name, 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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