Simplified distributed block storage with strong consistency, like in Ceph
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#include "osd.h"
void osd_t::read_requests()
{
for (int i = 0; i < read_ready_clients.size(); i++)
{
int peer_fd = read_ready_clients[i];
auto & cl = clients[peer_fd];
io_uring_sqe* sqe = ringloop->get_sqe();
if (!sqe)
{
read_ready_clients.erase(read_ready_clients.begin(), read_ready_clients.begin() + i);
return;
}
ring_data_t* data = ((ring_data_t*)sqe->user_data);
if (!cl.read_buf)
{
// no reads in progress
// so this is either a new command or a reply to a previously sent command
if (!cl.read_op)
{
cl.read_op = new osd_op_t;
cl.read_op->peer_fd = peer_fd;
}
cl.read_op->op_type = OSD_OP_IN;
cl.read_buf = &cl.read_op->req.buf;
cl.read_remaining = OSD_PACKET_SIZE;
cl.read_state = CL_READ_OP;
}
cl.read_iov.iov_base = cl.read_buf;
cl.read_iov.iov_len = cl.read_remaining;
cl.read_msg.msg_iov = &cl.read_iov;
cl.read_msg.msg_iovlen = 1;
data->callback = [this, peer_fd](ring_data_t *data) { handle_read(data, peer_fd); };
my_uring_prep_recvmsg(sqe, peer_fd, &cl.read_msg, 0);
cl.reading = true;
cl.read_ready = false;
}
read_ready_clients.clear();
}
void osd_t::handle_read(ring_data_t *data, int peer_fd)
{
auto cl_it = clients.find(peer_fd);
if (cl_it != clients.end())
{
auto & cl = cl_it->second;
if (data->res < 0 && data->res != -EAGAIN)
{
// this is a client socket, so don't panic. just disconnect it
printf("Client %d socket read error: %d (%s). Disconnecting client\n", peer_fd, -data->res, strerror(-data->res));
stop_client(peer_fd);
return;
}
cl.reading = false;
if (cl.read_ready)
{
read_ready_clients.push_back(peer_fd);
}
if (data->res > 0)
{
cl.read_remaining -= data->res;
cl.read_buf += data->res;
if (cl.read_remaining <= 0)
{
cl.read_buf = NULL;
if (cl.read_state == CL_READ_OP)
{
if (cl.read_op->req.hdr.magic == SECONDARY_OSD_REPLY_MAGIC)
{
handle_reply_hdr(&cl);
}
else
{
handle_op_hdr(&cl);
}
}
else if (cl.read_state == CL_READ_DATA)
{
// Operation is ready
exec_op(cl.read_op);
cl.read_op = NULL;
cl.read_state = 0;
}
else if (cl.read_state == CL_READ_REPLY_DATA)
{
// Reply is ready
auto req_it = cl.sent_ops.find(cl.read_reply_id);
osd_op_t *request = req_it->second;
cl.sent_ops.erase(req_it);
cl.read_reply_id = 0;
cl.read_state = 0;
request->callback(request);
}
}
}
}
}
void osd_t::handle_op_hdr(osd_client_t *cl)
{
osd_op_t *cur_op = cl->read_op;
if (cur_op->req.hdr.opcode == OSD_OP_SECONDARY_READ)
{
if (cur_op->req.sec_rw.len > 0)
cur_op->buf = memalign(512, cur_op->req.sec_rw.len);
cl->read_remaining = 0;
}
else if (cur_op->req.hdr.opcode == OSD_OP_SECONDARY_WRITE ||
cur_op->req.hdr.opcode == OSD_OP_SECONDARY_STABILIZE ||
cur_op->req.hdr.opcode == OSD_OP_SECONDARY_ROLLBACK)
{
if (cur_op->req.sec_rw.len > 0)
cur_op->buf = memalign(512, cur_op->req.sec_rw.len);
cl->read_remaining = cur_op->req.sec_rw.len;
}
else if (cur_op->req.hdr.opcode == OSD_OP_READ)
{
if (cur_op->req.rw.len > 0)
cur_op->buf = memalign(512, cur_op->req.rw.len);
cl->read_remaining = 0;
}
else if (cur_op->req.hdr.opcode == OSD_OP_WRITE)
{
if (cur_op->req.rw.len > 0)
cur_op->buf = memalign(512, cur_op->req.rw.len);
cl->read_remaining = cur_op->req.rw.len;
}
if (cl->read_remaining > 0)
{
// Read data
cl->read_buf = cur_op->buf;
cl->read_state = CL_READ_DATA;
}
else
{
// Operation is ready
cl->read_op = NULL;
cl->read_state = 0;
exec_op(cur_op);
}
}
void osd_t::handle_reply_hdr(osd_client_t *cl)
{
osd_op_t *cur_op = cl->read_op;
auto req_it = cl->sent_ops.find(cur_op->req.hdr.id);
if (req_it == cl->sent_ops.end())
{
// Command out of sync. Drop connection
stop_client(cl->peer_fd);
return;
}
osd_op_t *op = req_it->second;
memcpy(op->reply.buf, cur_op->req.buf, OSD_PACKET_SIZE);
if (op->reply.hdr.opcode == OSD_OP_SECONDARY_READ &&
op->reply.hdr.retval > 0)
{
// Read data. In this case we assume that the buffer is preallocated by the caller (!)
assert(op->buf);
cl->read_state = CL_READ_REPLY_DATA;
cl->read_reply_id = op->req.hdr.id;
cl->read_buf = op->buf;
cl->read_remaining = op->reply.hdr.retval;
}
else if (op->reply.hdr.opcode == OSD_OP_SECONDARY_LIST &&
op->reply.hdr.retval > 0)
{
op->buf = memalign(512, sizeof(obj_ver_id) * op->reply.hdr.retval);
cl->read_state = CL_READ_REPLY_DATA;
cl->read_reply_id = op->req.hdr.id;
cl->read_buf = op->buf;
cl->read_remaining = sizeof(obj_ver_id) * op->reply.hdr.retval;
}
else
{
cl->read_state = 0;
cl->sent_ops.erase(req_it);
op->callback(op);
}
}