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migration: control whether snapshots are ovewritten

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The traditional HMP "savevm" command will overwrite an existing snapshot
if it already exists with the requested name. This new flag allows this
to be controlled allowing for safer behaviour with a future QMP command.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20210204124834.774401-8-berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2021-02-04 12:48:29 +00:00 • committed by Dr. David Alan Gilbert
parent 3d3e9b1f66
commit f781f84189
5 changed files with 21 additions and 7 deletions
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19
migration/savevm.c
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@ -2764,7 +2764,7 @@ int qemu_load_device_state(QEMUFile *f)
return 0;
}
bool save_snapshot(const char *name, Error **errp)
bool save_snapshot(const char *name, bool overwrite, Error **errp)
{
BlockDriverState *bs;
QEMUSnapshotInfo sn1, *sn = &sn1;
@ -2792,8 +2792,21 @@ bool save_snapshot(const char *name, Error **errp)
/* Delete old snapshots of the same name */
if (name) {
if (bdrv_all_delete_snapshot(name, false, NULL, errp) < 0) {
return false;
if (overwrite) {
if (bdrv_all_delete_snapshot(name, false, NULL, errp) < 0) {
return false;
}
} else {
ret2 = bdrv_all_has_snapshot(name, false, NULL, errp);
if (ret2 < 0) {
return false;
}
if (ret2 == 1) {
error_setg(errp,
"Snapshot '%s' already exists in one or more devices",
name);
return false;
}
}
}