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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#pragma once
#include "acconfig.h"
#if defined(HAVE_LIBAIO)
#include <libaio.h>
#elif defined(HAVE_POSIXAIO)
#include <aio.h>
#include <sys/event.h>
#endif
#include <boost/intrusive/list.hpp>
#include <boost/container/small_vector.hpp>
#include "include/buffer.h"
#include "include/types.h"
struct aio_t {
#if defined(HAVE_LIBAIO)
struct iocb iocb{}; // must be first element; see shenanigans in aio_queue_t
#elif defined(HAVE_POSIXAIO)
// static long aio_listio_max = -1;
union {
struct aiocb aiocb;
struct aiocb *aiocbp;
} aio;
int n_aiocb;
#endif
void *priv;
int fd;
boost::container::small_vector<iovec,4> iov;
uint64_t offset, length;
long rval;
ceph::buffer::list bl; ///< write payload (so that it remains stable for duration)
boost::intrusive::list_member_hook<> queue_item;
aio_t(void *p, int f) : priv(p), fd(f), offset(0), length(0), rval(-1000) {
}
void pwritev(uint64_t _offset, uint64_t len) {
offset = _offset;
length = len;
#if defined(HAVE_LIBAIO)
io_prep_pwritev(&iocb, fd, &iov[0], iov.size(), offset);
#elif defined(HAVE_POSIXAIO)
n_aiocb = iov.size();
aio.aiocbp = (struct aiocb*)calloc(iov.size(), sizeof(struct aiocb));
for (int i = 0; i < iov.size(); i++) {
aio.aiocbp[i].aio_fildes = fd;
aio.aiocbp[i].aio_offset = offset;
aio.aiocbp[i].aio_buf = iov[i].iov_base;
aio.aiocbp[i].aio_nbytes = iov[i].iov_len;
aio.aiocbp[i].aio_lio_opcode = LIO_WRITE;
offset += iov[i].iov_len;
}
#endif
}
void preadv(uint64_t _offset, uint64_t len) {
offset = _offset;
length = len;
#if defined(HAVE_LIBAIO)
io_prep_preadv(&iocb, fd, &iov[0], iov.size(), offset);
#elif defined(HAVE_POSIXAIO)
n_aiocb = iov.size();
aio.aiocbp = (struct aiocb*)calloc(iov.size(), sizeof(struct aiocb));
for (size_t i = 0; i < iov.size(); i++) {
aio.aiocbp[i].aio_fildes = fd;
aio.aiocbp[i].aio_buf = iov[i].iov_base;
aio.aiocbp[i].aio_nbytes = iov[i].iov_len;
aio.aiocbp[i].aio_offset = offset;
aio.aiocbp[i].aio_lio_opcode = LIO_READ;
offset += iov[i].iov_len;
}
#endif
}
long get_return_value() {
return rval;
}
};
std::ostream& operator<<(std::ostream& os, const aio_t& aio);
typedef boost::intrusive::list<
aio_t,
boost::intrusive::member_hook<
aio_t,
boost::intrusive::list_member_hook<>,
&aio_t::queue_item> > aio_list_t;
struct io_queue_t {
typedef std::list<aio_t>::iterator aio_iter;
virtual ~io_queue_t() {};
virtual int init(std::vector<int> &fds) = 0;
virtual void shutdown() = 0;
virtual int submit_batch(aio_iter begin, aio_iter end, uint16_t aios_size,
void *priv, int *retries) = 0;
virtual int get_next_completed(int timeout_ms, aio_t **paio, int max) = 0;
};
struct aio_queue_t final : public io_queue_t {
int max_iodepth;
#if defined(HAVE_LIBAIO)
io_context_t ctx;
#elif defined(HAVE_POSIXAIO)
int ctx;
#endif
explicit aio_queue_t(unsigned max_iodepth)
: max_iodepth(max_iodepth),
ctx(0) {
}
~aio_queue_t() final {
ceph_assert(ctx == 0);
}
int init(std::vector<int> &fds) final {
(void)fds;
ceph_assert(ctx == 0);
#if defined(HAVE_LIBAIO)
int r = io_setup(max_iodepth, &ctx);
if (r < 0) {
if (ctx) {
io_destroy(ctx);
ctx = 0;
}
}
return r;
#elif defined(HAVE_POSIXAIO)
ctx = kqueue();
if (ctx < 0)
return -errno;
else
return 0;
#endif
}
void shutdown() final {
if (ctx) {
#if defined(HAVE_LIBAIO)
int r = io_destroy(ctx);
#elif defined(HAVE_POSIXAIO)
int r = close(ctx);
#endif
ceph_assert(r == 0);
ctx = 0;
}
}
int submit_batch(aio_iter begin, aio_iter end, uint16_t aios_size,
void *priv, int *retries) final;
int get_next_completed(int timeout_ms, aio_t **paio, int max) final;
};
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