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snapshot: create bdrv_all_goto_snapshot helper

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to switch to snapshot on all loaded block drivers.

The patch also ensures proper locking.

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 09:42:04 +03:00
committed by Juan Quintela
parent 9b00ea376d
commit 4c1cdbaad0
3 changed files with 26 additions and 10 deletions
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15
migration/savevm.c
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@ -2093,16 +2093,11 @@ int load_vmstate(const char *name)
/* Flush all IO requests so they don't interfere with the new state. */
bdrv_drain_all();
bs = NULL;
while ((bs = bdrv_next(bs))) {
if (bdrv_can_snapshot(bs)) {
ret = bdrv_snapshot_goto(bs, name);
if (ret < 0) {
error_report("Error %d while activating snapshot '%s' on '%s'",
ret, name, bdrv_get_device_name(bs));
return ret;
}
}
ret = bdrv_all_goto_snapshot(name, &bs);
if (ret < 0) {
error_report("Error %d while activating snapshot '%s' on '%s'",
ret, name, bdrv_get_device_name(bs));
return ret;
}
/* restore the VM state */