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Fix EPOLLET race on Linux 5.5+

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This commit is contained in:
Vitaliy Filippov
2020-03-03 01:47:56 +03:00
parent 20125db181
commit 2575431176
1 changed files with 16 additions and 15 deletions
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osd.cpp
+16 -15
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@@ -180,6 +180,22 @@ void osd_t::loop()
void osd_t::handle_epoll_events()
{
io_uring_sqe *sqe = ringloop->get_sqe();
if (!sqe)
{
throw std::runtime_error("can't get SQE, will fall out of sync with EPOLLET");
}
ring_data_t *data = ((ring_data_t*)sqe->user_data);
my_uring_prep_poll_add(sqe, epoll_fd, POLLIN);
data->callback = [this](ring_data_t *data)
{
if (data->res < 0)
{
throw std::runtime_error(std::string("epoll failed: ") + strerror(-data->res));
}
handle_epoll_events();
};
ringloop->submit();
int nfds;
epoll_event events[MAX_EPOLL_EVENTS];
restart:
@@ -251,21 +267,6 @@ restart:
{
goto restart;
}
io_uring_sqe *sqe = ringloop->get_sqe();
if (!sqe)
{
throw std::runtime_error("can't get SQE, will fall out of sync with EPOLLET");
}
ring_data_t *data = ((ring_data_t*)sqe->user_data);
my_uring_prep_poll_add(sqe, epoll_fd, POLLIN);
data->callback = [this](ring_data_t *data)
{
if (data->res < 0)
{
throw std::runtime_error(std::string("epoll failed: ") + strerror(-data->res));
}
handle_epoll_events();
};
}
void osd_t::cancel_osd_ops(osd_client_t & cl)