libceph: set 'exists' flag for newly up osd

Signed-off-by: NYan, Zheng <zyan@redhat.com>
Reviewed-by: NSage Weil <sage@redhat.com>
Signed-off-by: NIlya Dryomov <idryomov@gmail.com>

net/ceph/osdmap.c

@@ -1300,7 +1300,7 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 		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;
 	}