int gateway_create_and_write_obj(struct request *req)
{
if (is_object_cache_enabled() && !req->local && !bypass_object_cache(req))
return object_cache_handle_request(req);
return gateway_forward_request(req, false);
}
/*
* Try our best to read one copy and read local first.
*
* Return success if any read succeed. We don't call gateway_forward_request()
* because we only read once.
*/
int gateway_read_obj(struct request *req)
{
int i, ret = SD_RES_SUCCESS;
unsigned wlen, rlen;
struct sd_req fwd_hdr;
struct sd_rsp *rsp = (struct sd_rsp *)&fwd_hdr;
struct sd_vnode *v;
struct sd_vnode *obj_vnodes[SD_MAX_COPIES];
uint64_t oid = req->rq.obj.oid;
int nr_copies, j;
if (is_object_cache_enabled() && !req->local && !bypass_object_cache(req))
return object_cache_handle_request(req);
nr_copies = get_req_copy_number(req);
oid_to_vnodes(req->vinfo->vnodes, req->vinfo->nr_vnodes, oid,
nr_copies, obj_vnodes);
for (i = 0; i < nr_copies; i++) {
v = obj_vnodes[i];
if (!vnode_is_local(v))
continue;
ret = peer_read_obj(req);
if (ret == SD_RES_SUCCESS)
return ret;
eprintf("local read fail %x\n", ret);
break;
}
/*
* Read random copy from cluster for better load balance, useful for
* reading base VM's COW objects
*/
j = random();
for (i = 0; i < nr_copies; i++) {
int idx = (i + j) % nr_copies;
v = obj_vnodes[idx];
if (vnode_is_local(v))
continue;
/*
* We need to re-init it because rsp and req share the same
* structure.
*/
gateway_init_fwd_hdr(&fwd_hdr, &req->rq);
wlen = 0;
rlen = fwd_hdr.data_length;
ret = sheep_exec_req(&v->nid, &fwd_hdr, req->data, &wlen,
&rlen);
if (ret != SD_RES_SUCCESS)
continue;
/* Read success */
memcpy(&req->rp, rsp, sizeof(*rsp));
break;
}
return ret;
}
int default_format(void)
{
unsigned ret;
sd_dprintf("try get a clean store\n");
ret = rmdir_r(obj_path);
if (ret && ret != -ENOENT) {
sd_eprintf("failed to remove %s: %s\n",
obj_path, strerror(-ret));
return SD_RES_EIO;
}
if (mkdir(obj_path, def_dmode) < 0) {
sd_eprintf("%m\n");
return SD_RES_EIO;
}
if (is_object_cache_enabled())
object_cache_format();
return SD_RES_SUCCESS;
}