forked from vitalif/vitastor
290 lines
8.3 KiB
C++
290 lines
8.3 KiB
C++
#include <sys/socket.h>
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#include <sys/epoll.h>
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#include <sys/poll.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include "osd.h"
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osd_t::osd_t(blockstore_config_t & config, blockstore_t *bs, ring_loop_t *ringloop)
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{
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this->config = config;
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this->bs = bs;
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this->ringloop = ringloop;
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bind_address = config["bind_address"];
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if (bind_address == "")
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bind_address = "0.0.0.0";
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bind_port = strtoull(config["bind_port"].c_str(), NULL, 10);
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if (!bind_port || bind_port > 65535)
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bind_port = 11203;
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osd_num = strtoull(config["osd_num"].c_str(), NULL, 10);
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if (!osd_num)
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throw std::runtime_error("osd_num is required in the configuration");
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run_primary = config["run_primary"] == "true" || config["run_primary"] == "1" || config["run_primary"] == "yes";
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if (run_primary)
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init_primary();
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listen_fd = socket(AF_INET, SOCK_STREAM, 0);
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if (listen_fd < 0)
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{
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throw std::runtime_error(std::string("socket: ") + strerror(errno));
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}
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int enable = 1;
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setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
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sockaddr_in addr;
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int r;
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if ((r = inet_pton(AF_INET, bind_address.c_str(), &addr.sin_addr)) != 1)
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{
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close(listen_fd);
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throw std::runtime_error("bind address "+bind_address+(r == 0 ? " is not valid" : ": no ipv4 support"));
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}
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addr.sin_family = AF_INET;
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addr.sin_port = htons(bind_port);
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if (bind(listen_fd, (sockaddr*)&addr, sizeof(addr)) < 0)
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{
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close(listen_fd);
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throw std::runtime_error(std::string("bind: ") + strerror(errno));
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}
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if (listen(listen_fd, listen_backlog) < 0)
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{
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close(listen_fd);
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throw std::runtime_error(std::string("listen: ") + strerror(errno));
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}
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fcntl(listen_fd, F_SETFL, fcntl(listen_fd, F_GETFL, 0) | O_NONBLOCK);
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epoll_fd = epoll_create(1);
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if (epoll_fd < 0)
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{
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close(listen_fd);
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throw std::runtime_error(std::string("epoll_create: ") + strerror(errno));
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}
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epoll_event ev;
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ev.data.fd = listen_fd;
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// FIXME: Use EPOLLET
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ev.events = EPOLLIN;
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if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, listen_fd, &ev) < 0)
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{
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close(listen_fd);
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close(epoll_fd);
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throw std::runtime_error(std::string("epoll_ctl: ") + strerror(errno));
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}
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consumer.loop = [this]() { loop(); };
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ringloop->register_consumer(consumer);
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}
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osd_t::~osd_t()
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{
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ringloop->unregister_consumer(consumer);
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close(epoll_fd);
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close(listen_fd);
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}
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osd_op_t::~osd_op_t()
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{
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if (buf)
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{
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// Note: reusing osd_op_t WILL currently lead to memory leaks
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// So we don't reuse it, but free it every time
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if (op_type == OSD_OP_IN &&
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op.hdr.opcode == OSD_OP_SHOW_CONFIG)
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{
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std::string *str = (std::string*)buf;
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delete str;
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}
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else
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free(buf);
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}
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}
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bool osd_t::shutdown()
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{
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stopping = true;
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if (inflight_ops > 0)
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{
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return false;
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}
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return bs->is_safe_to_stop();
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}
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void osd_t::loop()
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{
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if (wait_state == 0)
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{
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io_uring_sqe *sqe = ringloop->get_sqe();
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if (!sqe)
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{
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wait_state = 0;
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return;
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}
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ring_data_t *data = ((ring_data_t*)sqe->user_data);
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my_uring_prep_poll_add(sqe, epoll_fd, POLLIN);
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data->callback = [&](ring_data_t *data)
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{
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if (data->res < 0)
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{
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throw std::runtime_error(std::string("epoll failed: ") + strerror(-data->res));
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}
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handle_epoll_events();
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};
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wait_state = 1;
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}
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else if (wait_state == 2)
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{
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handle_epoll_events();
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}
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handle_peers();
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send_replies();
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read_requests();
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ringloop->submit();
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}
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int osd_t::handle_epoll_events()
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{
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epoll_event events[MAX_EPOLL_EVENTS];
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int nfds = epoll_wait(epoll_fd, events, MAX_EPOLL_EVENTS, 0);
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for (int i = 0; i < nfds; i++)
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{
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if (events[i].data.fd == listen_fd)
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{
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// Accept new connections
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sockaddr_in addr;
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socklen_t peer_addr_size = sizeof(addr);
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int peer_fd;
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while ((peer_fd = accept(listen_fd, (sockaddr*)&addr, &peer_addr_size)) >= 0)
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{
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char peer_str[256];
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printf("osd: new client %d: connection from %s port %d\n", peer_fd, inet_ntop(AF_INET, &addr.sin_addr, peer_str, 256), ntohs(addr.sin_port));
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fcntl(peer_fd, F_SETFL, fcntl(listen_fd, F_GETFL, 0) | O_NONBLOCK);
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int one = 1;
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setsockopt(peer_fd, SOL_TCP, TCP_NODELAY, &one, sizeof(one));
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clients[peer_fd] = {
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.peer_addr = addr,
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.peer_port = ntohs(addr.sin_port),
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.peer_fd = peer_fd,
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.peer_state = PEER_CONNECTED,
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};
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// Add FD to epoll
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epoll_event ev;
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ev.data.fd = peer_fd;
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ev.events = EPOLLIN | EPOLLRDHUP;
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if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, peer_fd, &ev) < 0)
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{
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throw std::runtime_error(std::string("epoll_ctl: ") + strerror(errno));
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}
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// Try to accept next connection
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peer_addr_size = sizeof(addr);
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}
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if (peer_fd == -1 && errno != EAGAIN)
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{
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throw std::runtime_error(std::string("accept: ") + strerror(errno));
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}
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}
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else
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{
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auto & cl = clients[events[i].data.fd];
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if (events[i].events & EPOLLRDHUP)
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{
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// Stop client
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printf("osd: client %d disconnected\n", cl.peer_fd);
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stop_client(cl.peer_fd);
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}
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else if (cl.peer_state == PEER_CONNECTING)
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{
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if (events[i].events & EPOLLOUT)
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{
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handle_connect_result(cl.peer_fd);
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}
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}
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else if (!cl.read_ready)
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{
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// Mark client as ready (i.e. some data is available)
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cl.read_ready = true;
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if (!cl.reading)
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{
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read_ready_clients.push_back(cl.peer_fd);
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ringloop->wakeup();
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}
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}
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}
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}
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wait_state = nfds == MAX_EPOLL_EVENTS ? 2 : 0;
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return nfds;
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}
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void osd_t::stop_client(int peer_fd)
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{
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if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, peer_fd, NULL) < 0)
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{
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throw std::runtime_error(std::string("epoll_ctl: ") + strerror(errno));
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}
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auto it = clients.find(peer_fd);
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if (it->second.osd_num)
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{
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osd_peer_fds.erase(it->second.osd_num);
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}
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for (auto rit = read_ready_clients.begin(); rit != read_ready_clients.end(); rit++)
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{
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if (*rit == peer_fd)
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{
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read_ready_clients.erase(rit);
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break;
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}
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}
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for (auto wit = write_ready_clients.begin(); wit != write_ready_clients.end(); wit++)
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{
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if (*wit == peer_fd)
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{
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write_ready_clients.erase(wit);
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break;
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}
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}
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clients.erase(it);
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close(peer_fd);
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}
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void osd_t::exec_op(osd_op_t *cur_op)
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{
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if (stopping)
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{
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// Throw operation away
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delete cur_op;
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return;
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}
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inflight_ops++;
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if (cur_op->op.hdr.magic != SECONDARY_OSD_OP_MAGIC ||
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cur_op->op.hdr.opcode < OSD_OP_MIN || cur_op->op.hdr.opcode > OSD_OP_MAX ||
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(cur_op->op.hdr.opcode == OSD_OP_SECONDARY_READ || cur_op->op.hdr.opcode == OSD_OP_SECONDARY_WRITE ||
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cur_op->op.hdr.opcode == OSD_OP_READ || cur_op->op.hdr.opcode == OSD_OP_WRITE) &&
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(cur_op->op.sec_rw.len > OSD_RW_MAX || cur_op->op.sec_rw.len % OSD_RW_ALIGN || cur_op->op.sec_rw.offset % OSD_RW_ALIGN))
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{
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// Bad command
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cur_op->bs_op.retval = -EINVAL;
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secondary_op_callback(cur_op);
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return;
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}
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if (cur_op->op.hdr.opcode == OSD_OP_TEST_SYNC_STAB_ALL)
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{
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exec_sync_stab_all(cur_op);
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}
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else if (cur_op->op.hdr.opcode == OSD_OP_SHOW_CONFIG)
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{
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exec_show_config(cur_op);
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}
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else if (cur_op->op.hdr.opcode == OSD_OP_READ || cur_op->op.hdr.opcode == OSD_OP_WRITE)
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{
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exec_primary(cur_op);
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}
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else
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{
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exec_secondary(cur_op);
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}
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}
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