Simplified distributed block storage with strong consistency, like in Ceph
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#include <sys/socket.h>
#include <sys/epoll.h>
#include <sys/poll.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "osd.h"
#define CL_READ_OP 1
#define CL_READ_DATA 2
#define SQE_SENT 0x100l
#define CL_WRITE_READY 1
#define CL_WRITE_REPLY 2
#define CL_WRITE_DATA 3
osd_t::osd_t(blockstore_config_t & config, blockstore *bs, ring_loop_t *ringloop)
{
bind_address = config["bind_address"];
if (bind_address == "")
bind_address = "0.0.0.0";
bind_port = strtoull(config["bind_port"].c_str(), NULL, 10);
if (!bind_port || bind_port > 65535)
bind_port = 11203;
this->bs = bs;
this->ringloop = ringloop;
listen_fd = socket(AF_INET, SOCK_STREAM, 0);
if (listen_fd < 0)
{
throw std::runtime_error(std::string("socket: ") + strerror(errno));
}
int enable = 1;
setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
sockaddr_in addr;
int r;
if ((r = inet_pton(AF_INET, bind_address.c_str(), &addr.sin_addr)) != 1)
{
close(listen_fd);
throw std::runtime_error("bind address "+bind_address+(r == 0 ? " is not valid" : ": no ipv4 support"));
}
addr.sin_family = AF_INET;
addr.sin_port = htons(bind_port);
if (bind(listen_fd, (sockaddr*)&addr, sizeof(addr)) < 0)
{
close(listen_fd);
throw std::runtime_error(std::string("bind: ") + strerror(errno));
}
if (listen(listen_fd, listen_backlog) < 0)
{
close(listen_fd);
throw std::runtime_error(std::string("listen: ") + strerror(errno));
}
fcntl(listen_fd, F_SETFL, fcntl(listen_fd, F_GETFL, 0) | O_NONBLOCK);
epoll_fd = epoll_create(1);
if (epoll_fd < 0)
{
close(listen_fd);
throw std::runtime_error(std::string("epoll_create: ") + strerror(errno));
}
epoll_event ev;
ev.data.fd = listen_fd;
ev.events = EPOLLIN;
if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, listen_fd, &ev) < 0)
{
throw std::runtime_error(std::string("epoll_ctl: ") + strerror(errno));
}
consumer.loop = [this]() { loop(); };
ringloop->register_consumer(consumer);
}
osd_t::~osd_t()
{
ringloop->unregister_consumer(consumer);
close(epoll_fd);
close(listen_fd);
}
bool osd_t::shutdown()
{
// TODO
}
void osd_t::loop()
{
if (wait_state == 0)
{
io_uring_sqe *sqe = ringloop->get_sqe();
if (!sqe)
{
wait_state = 0;
return;
}
ring_data_t *data = ((ring_data_t*)sqe->user_data);
my_uring_prep_poll_add(sqe, epoll_fd, POLLIN);
data->callback = [&](ring_data_t *data)
{
if (data->res < 0)
{
throw std::runtime_error(std::string("epoll failed: ") + strerror(-data->res));
}
handle_epoll_events();
wait_state = 0;
};
wait_state = 1;
}
send_replies();
read_requests();
ringloop->submit();
}
#define MAX_EPOLL_EVENTS 16
int osd_t::handle_epoll_events()
{
epoll_event events[MAX_EPOLL_EVENTS];
int count = 0;
int nfds;
// FIXME: We shouldn't probably handle ALL available events, we should sometimes
// yield control to Blockstore and possibly other consumers
while ((nfds = epoll_wait(epoll_fd, events, MAX_EPOLL_EVENTS, 0)) > 0)
{
for (int i = 0; i < nfds; i++)
{
if (events[i].data.fd == listen_fd)
{
// Accept new connections
sockaddr_in addr;
socklen_t peer_addr_size = sizeof(addr);
int peer_fd;
while ((peer_fd = accept(listen_fd, (sockaddr*)&addr, &peer_addr_size)) >= 0)
{
char peer_str[256];
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));
fcntl(peer_fd, F_SETFL, fcntl(listen_fd, F_GETFL, 0) | O_NONBLOCK);
clients[peer_fd] = {
.peer_addr = addr,
.peer_addr_size = peer_addr_size,
.peer_fd = peer_fd,
};
// Add FD to epoll
epoll_event ev;
ev.data.fd = peer_fd;
ev.events = EPOLLIN | EPOLLRDHUP;
if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, peer_fd, &ev) < 0)
{
throw std::runtime_error(std::string("epoll_ctl: ") + strerror(errno));
}
// Try to accept next connection
peer_addr_size = sizeof(addr);
}
if (peer_fd == -1 && errno != EAGAIN)
{
throw std::runtime_error(std::string("accept: ") + strerror(errno));
}
}
else
{
auto & cl = clients[events[i].data.fd];
if (events[i].events & EPOLLRDHUP)
{
// Stop client
printf("osd: client %d disconnected\n", cl.peer_fd);
stop_client(cl.peer_fd);
}
else if (!cl.read_ready)
{
// Mark client as ready (i.e. some data is available)
cl.read_ready = true;
if (!cl.reading)
read_ready_clients.push_back(cl.peer_fd);
}
}
count++;
}
}
return count;
}
void osd_t::stop_client(int peer_fd)
{
epoll_event ev;
ev.data.fd = peer_fd;
ev.events = EPOLLIN | EPOLLHUP;
if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, peer_fd, &ev) < 0)
{
throw std::runtime_error(std::string("epoll_ctl: ") + strerror(errno));
}
auto it = clients.find(peer_fd);
if (it->second.read_ready)
{
for (auto rit = read_ready_clients.begin(); rit != read_ready_clients.end(); rit++)
{
if (*rit == peer_fd)
{
read_ready_clients.erase(rit);
break;
}
}
}
clients.erase(it);
close(peer_fd);
}
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 probably a new command
cl.read_op = new osd_op_t;
cl.read_buf = &cl.read_op->op_buf;
cl.read_remaining = OSD_OP_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)
{
osd_op_t *cur_op = cl.read_op;
cl.read_buf = NULL;
if (cl.read_state == CL_READ_OP)
{
if (cur_op->op.hdr.opcode == OSD_OP_SECONDARY_READ ||
cur_op->op.hdr.opcode == OSD_OP_SECONDARY_WRITE ||
cur_op->op.hdr.opcode == OSD_OP_SECONDARY_STABILIZE)
{
// Allocate a buffer
cur_op->buf = memalign(512, cur_op->op.sec_rw.len);
}
if (cur_op->op.hdr.opcode == OSD_OP_SECONDARY_WRITE ||
cur_op->op.hdr.opcode == OSD_OP_SECONDARY_STABILIZE)
{
// Read data
cl.read_buf = cur_op->buf;
cl.read_remaining = cur_op->op.sec_rw.len;
cl.read_state = CL_READ_DATA;
}
else
{
// Command is ready
cur_op->peer_fd = peer_fd;
enqueue_op(cur_op);
cl.read_op = NULL;
cl.read_state = 0;
}
}
else if (cl.read_state == CL_READ_DATA)
{
// Command is ready
cur_op->peer_fd = peer_fd;
enqueue_op(cur_op);
cl.read_op = NULL;
cl.read_state = 0;
}
}
}
}
}
void osd_t::enqueue_op(osd_op_t *cur_op)
{
cur_op->bs_op.callback = [this, cur_op](blockstore_operation* bs_op)
{
auto cl_it = clients.find(cur_op->peer_fd);
if (cl_it != clients.end())
{
auto & cl = cl_it->second;
if (cl.write_state == 0)
{
cl.write_state = CL_WRITE_READY;
write_ready_clients.push_back(cur_op->peer_fd);
}
cl.completions.push_back(cur_op);
ringloop->wakeup();
}
else
{
delete cur_op;
}
};
if (cur_op->op.hdr.magic != SECONDARY_OSD_OP_MAGIC ||
cur_op->op.hdr.opcode < OSD_OP_MIN || cur_op->op.hdr.opcode > OSD_OP_MAX ||
(cur_op->op.hdr.opcode == OSD_OP_SECONDARY_READ || cur_op->op.hdr.opcode == OSD_OP_SECONDARY_WRITE) &&
(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))
{
// Bad command
cur_op->bs_op.retval = -EINVAL;
cur_op->bs_op.callback(&cur_op->bs_op);
return;
}
// FIXME: LIST is not a blockstore op yet
cur_op->bs_op.flags = (cur_op->op.hdr.opcode == OSD_OP_SECONDARY_READ ? OP_READ
: (cur_op->op.hdr.opcode == OSD_OP_SECONDARY_WRITE ? OP_WRITE
: (cur_op->op.hdr.opcode == OSD_OP_SECONDARY_SYNC ? OP_SYNC
: (cur_op->op.hdr.opcode == OSD_OP_SECONDARY_STABILIZE ? OP_STABLE
: (cur_op->op.hdr.opcode == OSD_OP_SECONDARY_DELETE ? OP_DELETE
: -1)))));
if (cur_op->op.hdr.opcode == OSD_OP_SECONDARY_READ ||
cur_op->op.hdr.opcode == OSD_OP_SECONDARY_WRITE)
{
cur_op->bs_op.oid = cur_op->op.sec_rw.oid;
cur_op->bs_op.version = cur_op->op.sec_rw.version;
cur_op->bs_op.offset = cur_op->op.sec_rw.offset;
cur_op->bs_op.len = cur_op->op.sec_rw.len;
cur_op->bs_op.buf = cur_op->buf;
}
else if (cur_op->op.hdr.opcode == OSD_OP_SECONDARY_DELETE)
{
cur_op->bs_op.oid = cur_op->op.sec_del.oid;
cur_op->bs_op.version = cur_op->op.sec_del.version;
}
else if (cur_op->op.hdr.opcode == OSD_OP_SECONDARY_STABILIZE)
{
cur_op->bs_op.len = cur_op->op.sec_stabilize.len/sizeof(obj_ver_id);
cur_op->bs_op.buf = cur_op->buf;
}
bs->enqueue_op(&cur_op->bs_op);
}
void osd_t::send_replies()
{
for (int i = 0; i < write_ready_clients.size(); i++)
{
int peer_fd = write_ready_clients[i];
auto & cl = clients[peer_fd];
io_uring_sqe* sqe = ringloop->get_sqe();
if (!sqe)
{
write_ready_clients.erase(write_ready_clients.begin(), write_ready_clients.begin() + i);
return;
}
ring_data_t* data = ((ring_data_t*)sqe->user_data);
if (!cl.write_buf)
{
// pick next command
cl.write_op = cl.completions.front();
cl.completions.pop_front();
make_reply(cl.write_op);
cl.write_buf = &cl.write_op->reply_buf;
cl.write_remaining = OSD_REPLY_PACKET_SIZE;
cl.write_state = CL_WRITE_REPLY;
}
cl.write_iov.iov_base = cl.write_buf;
cl.write_iov.iov_len = cl.write_remaining;
cl.write_msg.msg_iov = &cl.write_iov;
cl.write_msg.msg_iovlen = 1;
data->callback = [this, peer_fd](ring_data_t *data) { handle_send(data, peer_fd); };
my_uring_prep_sendmsg(sqe, peer_fd, &cl.write_msg, 0);
cl.write_state = cl.write_state | SQE_SENT;
}
write_ready_clients.clear();
}
void osd_t::make_reply(osd_op_t *op)
{
op->reply.hdr.magic = SECONDARY_OSD_REPLY_MAGIC;
op->reply.hdr.id = op->op.hdr.id;
op->reply.hdr.retval = op->bs_op.retval;
}
void osd_t::handle_send(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 write error: %d (%s). Disconnecting client\n", peer_fd, -data->res, strerror(-data->res));
stop_client(peer_fd);
return;
}
cl.write_state = cl.write_state & ~SQE_SENT;
if (data->res > 0)
{
cl.write_remaining -= data->res;
cl.write_buf += data->res;
if (cl.write_remaining <= 0)
{
cl.write_buf = NULL;
osd_op_t *cur_op = cl.write_op;
if (cl.write_state == CL_WRITE_REPLY)
{
if (cur_op->op.hdr.opcode == OSD_OP_SECONDARY_READ &&
cur_op->reply.hdr.retval > 0)
{
// Send data
cl.write_buf = cur_op->buf;
cl.write_remaining = cur_op->reply.hdr.retval;
cl.write_state = CL_WRITE_DATA;
}
else if (cur_op->op.hdr.opcode == OSD_OP_SECONDARY_LIST)
{
// FIXME
}
else
{
goto op_done;
}
}
else if (cl.write_state == CL_WRITE_DATA)
{
op_done:
// Done
delete cur_op;
cl.write_op = NULL;
cl.write_state = cl.completions.size() > 0 ? CL_WRITE_READY : 0;
}
}
}
if (cl.write_state != 0)
{
write_ready_clients.push_back(peer_fd);
}
}
}