libceph: set 'exists' flag for newly up osd

Signed-off-by: Yan, Zheng <[e-mail]>
Reviewed-by: Sage Weil <[e-mail]>
Signed-off-by: Ilya Dryomov <[e-mail]>

net/ceph/osdmap.c

···
 		ceph_decode_addr(&addr);
 		pr_info("osd%d up\n", osd);
 		BUG_ON(osd >= map->max_osd);
-		map->osd_state[osd] |= CEPH_OSD_UP;
+		map->osd_state[osd] |= CEPH_OSD_UP | CEPH_OSD_EXISTS;
 		map->osd_addr[osd] = addr;
 	}