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 gateway_create_and_write_obj(struct request *req)
{
uint64_t oid = req->rq.obj.oid;
if (oid_is_readonly(oid))
return SD_RES_READONLY;
if (!bypass_object_cache(req))
return object_cache_handle_request(req);
return gateway_forward_request(req);
}
/*
* 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;
struct sd_req fwd_hdr;
struct sd_rsp *rsp = (struct sd_rsp *)&fwd_hdr;
const struct sd_vnode *v;
const struct sd_vnode *my_v;
const struct sd_vnode *obj_vnodes[SD_MAX_COPIES];
const struct sd_vnode *my_obj_vnodes[SD_MAX_COPIES];
uint64_t oid = req->rq.obj.oid;
int nr_copies, j;
//PRINT_TO_LOG("WYH\n");
if (sys->enable_object_cache && !req->local &&
!bypass_object_cache(req)) {
ret = object_cache_handle_request(req);
goto out;
}
nr_copies = get_req_copy_number(req);
if (nr_copies == 0) {
sd_debug("there is no living nodes");
return SD_RES_HALT;
}
oid_to_vnodes(req->vinfo->vnodes, req->vinfo->nr_vnodes, oid,
nr_copies, obj_vnodes);
//PRINT_TO_LOG("out:%s\n", addr_to_str(obj_vnodes[0]->nid.addr,obj_vnodes[0]->nid.port));
oid_to_vnodes(req->vinfo->my_vnodes, req->vinfo->my_nr_vnodes, oid, nr_copies, my_obj_vnodes);
my_v = my_obj_vnodes[0];
//PRINT_TO_LOG("out:%s\n", addr_to_str(my_v->nid.addr,my_v->nid.port));
for (i = 0; i < nr_copies; i++) {
v = obj_vnodes[0];
my_v = my_obj_vnodes[0];
//PRINT_TO_LOG("phy:%s\n", addr_to_str(v->nid.addr,v->nid.port));
//PRINT_TO_LOG("vir:%s\n", addr_to_str(my_v->nid.addr, my_v->nid.port));
//PRINT_TO_LOG("%d,%d\n", req->vinfo->nr_vnodes, req->vinfo->my_nr_vnodes);
if (!vnode_is_local(v))
continue;
ret = peer_read_obj(req);
if (ret == SD_RES_SUCCESS)
goto out;
sd_err("local read %"PRIx64" failed, %s", oid,
sd_strerror(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);
ret = sheep_exec_req(&v->nid, &fwd_hdr, req->data);
if (ret != SD_RES_SUCCESS)
continue;
/* Read success */
memcpy(&req->rp, rsp, sizeof(*rsp));
break;
}
out:
if (ret == SD_RES_SUCCESS &&
req->rq.proto_ver < SD_PROTO_VER_TRIM_ZERO_SECTORS) {
/* the client doesn't support trimming zero bytes */
untrim_zero_blocks(req->data, req->rp.obj.offset,
req->rp.data_length, req->rq.data_length);
req->rp.data_length = req->rq.data_length;
req->rp.obj.offset = 0;
}
return ret;
}