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snapshot: create helper to test that block drivers supports snapshots

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The patch enforces proper locking for this operation.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
Tested-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Denis V. Lunev 2015-11-19 09:42:01 +03:00 • committed by Juan Quintela
parent 5df5416e63
commit e9ff957ac2
3 changed files with 36 additions and 13 deletions
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17
migration/savevm.c
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@ -1958,19 +1958,10 @@ void hmp_savevm(Monitor *mon, const QDict *qdict)
const char *name = qdict_get_try_str(qdict, "name");
Error *local_err = NULL;
/* Verify if there is a device that doesn't support snapshots and is writable */
bs = NULL;
while ((bs = bdrv_next(bs))) {
if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
continue;
}
if (!bdrv_can_snapshot(bs)) {
monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
bdrv_get_device_name(bs));
return;
}
if (!bdrv_all_can_snapshot(&bs)) {
monitor_printf(mon, "Device '%s' is writable but does not "
"support snapshots.\n", bdrv_get_device_name(bs));
return;
}
bs = find_vmstate_bs();