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/*
* posixaio engine
*
* IO engine that uses the posix defined aio interface.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include "../fio.h"
#ifdef FIO_HAVE_POSIXAIO
struct posixaio_data {
struct io_u **aio_events;
};
static int fill_timespec(struct timespec *ts)
{
#ifdef _POSIX_TIMERS
if (!clock_gettime(CLOCK_MONOTONIC, ts))
return 0;
perror("clock_gettime");
#endif
return 1;
}
static unsigned long long ts_utime_since_now(struct timespec *t)
{
long long sec, nsec;
struct timespec now;
if (fill_timespec(&now))
return 0;
sec = now.tv_sec - t->tv_sec;
nsec = now.tv_nsec - t->tv_nsec;
if (sec > 0 && nsec < 0) {
sec--;
nsec += 1000000000;
}
sec *= 1000000;
nsec /= 1000;
return sec + nsec;
}
static int fio_posixaio_cancel(struct thread_data fio_unused *td,
struct io_u *io_u)
{
struct fio_file *f = io_u->file;
int r = aio_cancel(f->fd, &io_u->aiocb);
if (r == 1 || r == AIO_CANCELED)
return 0;
return 1;
}
static int fio_posixaio_prep(struct thread_data fio_unused *td,
struct io_u *io_u)
{
struct aiocb *aiocb = &io_u->aiocb;
struct fio_file *f = io_u->file;
aiocb->aio_fildes = f->fd;
aiocb->aio_buf = io_u->xfer_buf;
aiocb->aio_nbytes = io_u->xfer_buflen;
aiocb->aio_offset = io_u->offset;
io_u->seen = 0;
return 0;
}
#define SUSPEND_ENTRIES 8
static int fio_posixaio_getevents(struct thread_data *td, unsigned int min,
unsigned int max, struct timespec *t)
{
struct posixaio_data *pd = td->io_ops->data;
struct aiocb *suspend_list[SUSPEND_ENTRIES];
struct flist_head *entry;
struct timespec start;
int have_timeout = 0;
int suspend_entries = 0;
unsigned int r;
if (t && !fill_timespec(&start))
have_timeout = 1;
r = 0;
memset(suspend_list, 0, sizeof(*suspend_list));
restart:
flist_for_each(entry, &td->io_u_busylist) {
struct io_u *io_u = flist_entry(entry, struct io_u, list);
int err;
if (io_u->seen)
continue;
err = aio_error(&io_u->aiocb);
if (err == EINPROGRESS) {
if (suspend_entries < SUSPEND_ENTRIES) {
suspend_list[suspend_entries] = &io_u->aiocb;
suspend_entries++;
}
continue;
}
io_u->seen = 1;
pd->aio_events[r++] = io_u;
if (err == ECANCELED)
io_u->resid = io_u->xfer_buflen;
else if (!err) {
ssize_t retval = aio_return(&io_u->aiocb);
io_u->resid = io_u->xfer_buflen - retval;
} else
io_u->error = err;
if (r >= max)
break;
}
if (r >= min)
return r;
if (have_timeout) {
unsigned long long usec;
usec = (t->tv_sec * 1000000) + (t->tv_nsec / 1000);
if (ts_utime_since_now(&start) > usec)
return r;
}
/*
* must have some in-flight, wait for at least one
*/
aio_suspend((const struct aiocb * const *)suspend_list,
suspend_entries, t);
goto restart;
}
static struct io_u *fio_posixaio_event(struct thread_data *td, int event)
{
struct posixaio_data *pd = td->io_ops->data;
return pd->aio_events[event];
}
static int fio_posixaio_queue(struct thread_data fio_unused *td,
struct io_u *io_u)
{
struct aiocb *aiocb = &io_u->aiocb;
int ret;
fio_ro_check(td, io_u);
if (io_u->ddir == DDIR_READ)
ret = aio_read(aiocb);
else if (io_u->ddir == DDIR_WRITE)
ret = aio_write(aiocb);
else
ret = aio_fsync(O_SYNC, aiocb);
if (ret) {
io_u->error = errno;
td_verror(td, io_u->error, "xfer");
return FIO_Q_COMPLETED;
}
return FIO_Q_QUEUED;
}
static void fio_posixaio_cleanup(struct thread_data *td)
{
struct posixaio_data *pd = td->io_ops->data;
if (pd) {
free(pd->aio_events);
free(pd);
}
}
static int fio_posixaio_init(struct thread_data *td)
{
struct posixaio_data *pd = malloc(sizeof(*pd));
memset(pd, 0, sizeof(*pd));
pd->aio_events = malloc(td->o.iodepth * sizeof(struct io_u *));
memset(pd->aio_events, 0, td->o.iodepth * sizeof(struct io_u *));
td->io_ops->data = pd;
return 0;
}
static struct ioengine_ops ioengine = {
.name = "posixaio",
.version = FIO_IOOPS_VERSION,
.init = fio_posixaio_init,
.prep = fio_posixaio_prep,
.queue = fio_posixaio_queue,
.cancel = fio_posixaio_cancel,
.getevents = fio_posixaio_getevents,
.event = fio_posixaio_event,
.cleanup = fio_posixaio_cleanup,
.open_file = generic_open_file,
.close_file = generic_close_file,
};
#else /* FIO_HAVE_POSIXAIO */
/*
* When we have a proper configure system in place, we simply wont build
* and install this io engine. For now install a crippled version that
* just complains and fails to load.
*/
static int fio_posixaio_init(struct thread_data fio_unused *td)
{
fprintf(stderr, "fio: posixaio not available\n");
return 1;
}
static struct ioengine_ops ioengine = {
.name = "posixaio",
.version = FIO_IOOPS_VERSION,
.init = fio_posixaio_init,
};
#endif
static void fio_init fio_posixaio_register(void)
{
register_ioengine(&ioengine);
}
static void fio_exit fio_posixaio_unregister(void)
{
unregister_ioengine(&ioengine);
}
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