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blockdev: enable non-root nodes for backup source 

This is needed to implement the image-fleecing workflow where we
create a temporary node backed by an active node, then start
backupdev-backup sync=none from the active node to the temp node.

In this case, the active node is now a root node AND a backing node,
so it no longer qualifies as a root node, so we loosen the restriction
on which nodes can be considered as the source for a backup.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20180702194630.9360-2-jsnow@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2018-07-02 15:46:29 -04:00 committed by Eric Blake
parent 8ee1cef459
commit 930fe17f99
1 changed files with 2 additions and 2 deletions
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4
blockdev.c
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@ -1859,7 +1859,7 @@ static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
backup = common->action->u.blockdev_backup.data;
bs = qmp_get_root_bs(backup->device, errp);
bs = bdrv_lookup_bs(backup->device, backup->device, errp);
if (!bs) {
return;
}
@ -3517,7 +3517,7 @@ BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
backup->compress = false;
}
bs = qmp_get_root_bs(backup->device, errp);
bs = bdrv_lookup_bs(backup->device, backup->device, errp);
if (!bs) {
return NULL;
}