Simplified distributed block storage with strong consistency, like in Ceph
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// Copyright (c) Vitaliy Filippov, 2019+
// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
#define _XOPEN_SOURCE
#include <limits.h>
#include "messenger.h"
void osd_messenger_t::outbox_push(osd_op_t *cur_op)
{
assert(cur_op->peer_fd);
osd_client_t *cl = clients.at(cur_op->peer_fd);
if (cur_op->op_type == OSD_OP_OUT)
{
clock_gettime(CLOCK_REALTIME, &cur_op->tv_begin);
}
else
{
// Check that operation actually belongs to this client
// FIXME: Review if this is still needed
bool found = false;
for (auto it = cl->received_ops.begin(); it != cl->received_ops.end(); it++)
{
if (*it == cur_op)
{
found = true;
cl->received_ops.erase(it, it+1);
break;
}
}
if (!found)
{
delete cur_op;
return;
}
}
auto & to_send_list = cl->write_msg.msg_iovlen ? cl->next_send_list : cl->send_list;
auto & to_outbox = cl->write_msg.msg_iovlen ? cl->next_outbox : cl->outbox;
if (cur_op->op_type == OSD_OP_IN)
{
measure_exec(cur_op);
to_send_list.push_back((iovec){ .iov_base = cur_op->reply.buf, .iov_len = OSD_PACKET_SIZE });
}
else
{
to_send_list.push_back((iovec){ .iov_base = cur_op->req.buf, .iov_len = OSD_PACKET_SIZE });
cl->sent_ops[cur_op->req.hdr.id] = cur_op;
}
to_outbox.push_back(NULL);
// Operation data
if ((cur_op->op_type == OSD_OP_IN
? (cur_op->req.hdr.opcode == OSD_OP_READ ||
cur_op->req.hdr.opcode == OSD_OP_SEC_READ ||
cur_op->req.hdr.opcode == OSD_OP_SEC_LIST ||
cur_op->req.hdr.opcode == OSD_OP_SHOW_CONFIG)
: (cur_op->req.hdr.opcode == OSD_OP_WRITE ||
cur_op->req.hdr.opcode == OSD_OP_SEC_WRITE ||
cur_op->req.hdr.opcode == OSD_OP_SEC_WRITE_STABLE ||
cur_op->req.hdr.opcode == OSD_OP_SEC_STABILIZE ||
cur_op->req.hdr.opcode == OSD_OP_SEC_ROLLBACK)) && cur_op->iov.count > 0)
{
for (int i = 0; i < cur_op->iov.count; i++)
{
assert(cur_op->iov.buf[i].iov_base);
to_send_list.push_back(cur_op->iov.buf[i]);
to_outbox.push_back(NULL);
}
}
if (cur_op->op_type == OSD_OP_IN)
{
// To free it later
to_outbox[to_outbox.size()-1] = cur_op;
}
if (!ringloop)
{
// FIXME: It's worse because it doesn't allow batching
while (cl->outbox.size())
{
try_send(cl);
}
}
else if (cl->write_msg.msg_iovlen > 0 || !try_send(cl))
{
if (cl->write_state == 0)
{
cl->write_state = CL_WRITE_READY;
write_ready_clients.push_back(cur_op->peer_fd);
}
ringloop->wakeup();
}
}
void osd_messenger_t::measure_exec(osd_op_t *cur_op)
{
// Measure execution latency
if (cur_op->req.hdr.opcode > OSD_OP_MAX)
{
return;
}
timespec tv_end;
clock_gettime(CLOCK_REALTIME, &tv_end);
stats.op_stat_count[cur_op->req.hdr.opcode]++;
if (!stats.op_stat_count[cur_op->req.hdr.opcode])
{
stats.op_stat_count[cur_op->req.hdr.opcode]++;
stats.op_stat_sum[cur_op->req.hdr.opcode] = 0;
stats.op_stat_bytes[cur_op->req.hdr.opcode] = 0;
}
stats.op_stat_sum[cur_op->req.hdr.opcode] += (
(tv_end.tv_sec - cur_op->tv_begin.tv_sec)*1000000 +
(tv_end.tv_nsec - cur_op->tv_begin.tv_nsec)/1000
);
if (cur_op->req.hdr.opcode == OSD_OP_READ ||
cur_op->req.hdr.opcode == OSD_OP_WRITE)
{
stats.op_stat_bytes[cur_op->req.hdr.opcode] += cur_op->req.rw.len;
}
else if (cur_op->req.hdr.opcode == OSD_OP_SEC_READ ||
cur_op->req.hdr.opcode == OSD_OP_SEC_WRITE ||
cur_op->req.hdr.opcode == OSD_OP_SEC_WRITE_STABLE)
{
stats.op_stat_bytes[cur_op->req.hdr.opcode] += cur_op->req.sec_rw.len;
}
}
bool osd_messenger_t::try_send(osd_client_t *cl)
{
int peer_fd = cl->peer_fd;
if (!cl->send_list.size() || cl->write_msg.msg_iovlen > 0)
{
return true;
}
if (ringloop && !use_sync_send_recv)
{
io_uring_sqe* sqe = ringloop->get_sqe();
if (!sqe)
{
return false;
}
cl->write_msg.msg_iov = cl->send_list.data();
cl->write_msg.msg_iovlen = cl->send_list.size() < IOV_MAX ? cl->send_list.size() : IOV_MAX;
cl->refs++;
ring_data_t* data = ((ring_data_t*)sqe->user_data);
data->callback = [this, cl](ring_data_t *data) { handle_send(data->res, cl); };
my_uring_prep_sendmsg(sqe, peer_fd, &cl->write_msg, 0);
}
else
{
cl->write_msg.msg_iov = cl->send_list.data();
cl->write_msg.msg_iovlen = cl->send_list.size() < IOV_MAX ? cl->send_list.size() : IOV_MAX;
cl->refs++;
int result = sendmsg(peer_fd, &cl->write_msg, MSG_NOSIGNAL);
if (result < 0)
{
result = -errno;
}
handle_send(result, cl);
}
return true;
}
void osd_messenger_t::send_replies()
{
for (int i = 0; i < write_ready_clients.size(); i++)
{
int peer_fd = write_ready_clients[i];
auto cl_it = clients.find(peer_fd);
if (cl_it != clients.end() && !try_send(cl_it->second))
{
write_ready_clients.erase(write_ready_clients.begin(), write_ready_clients.begin() + i);
return;
}
}
write_ready_clients.clear();
}
void osd_messenger_t::handle_send(int result, osd_client_t *cl)
{
cl->write_msg.msg_iovlen = 0;
cl->refs--;
if (cl->peer_state == PEER_STOPPED)
{
if (cl->refs <= 0)
{
delete cl;
}
return;
}
if (result < 0 && result != -EAGAIN)
{
// this is a client socket, so don't panic. just disconnect it
printf("Client %d socket write error: %d (%s). Disconnecting client\n", cl->peer_fd, -result, strerror(-result));
stop_client(cl->peer_fd);
return;
}
if (result >= 0)
{
int done = 0;
while (result > 0 && done < cl->send_list.size())
{
iovec & iov = cl->send_list[done];
if (iov.iov_len <= result)
{
if (cl->outbox[done])
{
// Reply fully sent
delete cl->outbox[done];
}
result -= iov.iov_len;
done++;
}
else
{
iov.iov_len -= result;
iov.iov_base += result;
break;
}
}
if (done > 0)
{
cl->send_list.erase(cl->send_list.begin(), cl->send_list.begin()+done);
cl->outbox.erase(cl->outbox.begin(), cl->outbox.begin()+done);
}
if (cl->next_send_list.size())
{
cl->send_list.insert(cl->send_list.end(), cl->next_send_list.begin(), cl->next_send_list.end());
cl->outbox.insert(cl->outbox.end(), cl->next_outbox.begin(), cl->next_outbox.end());
cl->next_send_list.clear();
cl->next_outbox.clear();
}
cl->write_state = cl->outbox.size() > 0 ? CL_WRITE_READY : 0;
}
if (cl->write_state != 0)
{
write_ready_clients.push_back(cl->peer_fd);
}
}