blob: ad34d065a3c3bb5cea63e97963a6a3609cd44707 [file] [log] [blame]
/*
* libaio engine
*
* IO engine using the Linux native aio interface.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include "../fio.h"
#ifdef FIO_HAVE_LIBAIO
#define ev_to_iou(ev) (struct io_u *) ((unsigned long) (ev)->obj)
struct libaio_data {
io_context_t aio_ctx;
struct io_event *aio_events;
struct iocb **iocbs;
struct io_u **io_us;
int iocbs_nr;
};
static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u)
{
struct fio_file *f = io_u->file;
if (io_u->ddir == DDIR_READ)
io_prep_pread(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
else if (io_u->ddir == DDIR_WRITE)
io_prep_pwrite(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
else if (ddir_sync(io_u->ddir))
io_prep_fsync(&io_u->iocb, f->fd);
return 0;
}
static struct io_u *fio_libaio_event(struct thread_data *td, int event)
{
struct libaio_data *ld = td->io_ops->data;
struct io_event *ev;
struct io_u *io_u;
ev = ld->aio_events + event;
io_u = ev_to_iou(ev);
if (ev->res != io_u->xfer_buflen) {
if (ev->res > io_u->xfer_buflen)
io_u->error = -ev->res;
else
io_u->resid = io_u->xfer_buflen - ev->res;
} else
io_u->error = 0;
return io_u;
}
struct aio_ring {
unsigned id; /** kernel internal index number */
unsigned nr; /** number of io_events */
unsigned head;
unsigned tail;
unsigned magic;
unsigned compat_features;
unsigned incompat_features;
unsigned header_length; /** size of aio_ring */
struct io_event events[0];
};
#define AIO_RING_MAGIC 0xa10a10a1
static int user_io_getevents(io_context_t aio_ctx, unsigned int max,
struct io_event *events)
{
long i = 0;
unsigned head;
struct aio_ring *ring = (struct aio_ring*) aio_ctx;
while (i < max) {
head = ring->head;
if (head == ring->tail) {
/* There are no more completions */
break;
} else {
/* There is another completion to reap */
events[i] = ring->events[head];
read_barrier();
ring->head = (head + 1) % ring->nr;
i++;
}
}
return i;
}
static int fio_libaio_getevents(struct thread_data *td, unsigned int min,
unsigned int max, struct timespec *t)
{
struct libaio_data *ld = td->io_ops->data;
unsigned actual_min = td->o.iodepth_batch_complete == 0 ? 0 : min;
int r, events = 0;
do {
if (td->o.userspace_libaio_reap == 1
&& actual_min == 0
&& ((struct aio_ring *)(ld->aio_ctx))->magic
== AIO_RING_MAGIC) {
r = user_io_getevents(ld->aio_ctx, max,
ld->aio_events + events);
} else {
r = io_getevents(ld->aio_ctx, actual_min,
max, ld->aio_events + events, t);
}
if (r >= 0)
events += r;
else if (r == -EAGAIN)
usleep(100);
} while (events < min);
return r < 0 ? r : events;
}
static int fio_libaio_queue(struct thread_data *td, struct io_u *io_u)
{
struct libaio_data *ld = td->io_ops->data;
fio_ro_check(td, io_u);
if (ld->iocbs_nr == (int) td->o.iodepth)
return FIO_Q_BUSY;
/*
* fsync is tricky, since it can fail and we need to do it
* serialized with other io. the reason is that linux doesn't
* support aio fsync yet. So return busy for the case where we
* have pending io, to let fio complete those first.
*/
if (ddir_sync(io_u->ddir)) {
if (ld->iocbs_nr)
return FIO_Q_BUSY;
do_io_u_sync(td, io_u);
return FIO_Q_COMPLETED;
}
if (io_u->ddir == DDIR_TRIM) {
if (ld->iocbs_nr)
return FIO_Q_BUSY;
do_io_u_trim(td, io_u);
return FIO_Q_COMPLETED;
}
ld->iocbs[ld->iocbs_nr] = &io_u->iocb;
ld->io_us[ld->iocbs_nr] = io_u;
ld->iocbs_nr++;
return FIO_Q_QUEUED;
}
static void fio_libaio_queued(struct thread_data *td, struct io_u **io_us,
unsigned int nr)
{
struct timeval now;
unsigned int i;
if (!fio_fill_issue_time(td))
return;
fio_gettime(&now, NULL);
for (i = 0; i < nr; i++) {
struct io_u *io_u = io_us[i];
memcpy(&io_u->issue_time, &now, sizeof(now));
io_u_queued(td, io_u);
}
}
static int fio_libaio_commit(struct thread_data *td)
{
struct libaio_data *ld = td->io_ops->data;
struct iocb **iocbs;
struct io_u **io_us;
int ret;
if (!ld->iocbs_nr)
return 0;
io_us = ld->io_us;
iocbs = ld->iocbs;
do {
ret = io_submit(ld->aio_ctx, ld->iocbs_nr, iocbs);
if (ret > 0) {
fio_libaio_queued(td, io_us, ret);
io_u_mark_submit(td, ret);
ld->iocbs_nr -= ret;
io_us += ret;
iocbs += ret;
ret = 0;
} else if (!ret || ret == -EAGAIN || ret == -EINTR) {
if (!ret)
io_u_mark_submit(td, ret);
continue;
} else
break;
} while (ld->iocbs_nr);
return ret;
}
static int fio_libaio_cancel(struct thread_data *td, struct io_u *io_u)
{
struct libaio_data *ld = td->io_ops->data;
return io_cancel(ld->aio_ctx, &io_u->iocb, ld->aio_events);
}
static void fio_libaio_cleanup(struct thread_data *td)
{
struct libaio_data *ld = td->io_ops->data;
if (ld) {
io_destroy(ld->aio_ctx);
free(ld->aio_events);
free(ld->iocbs);
free(ld->io_us);
free(ld);
}
}
static int fio_libaio_init(struct thread_data *td)
{
struct libaio_data *ld = malloc(sizeof(*ld));
int err;
memset(ld, 0, sizeof(*ld));
err = io_queue_init(td->o.iodepth, &ld->aio_ctx);
if (err) {
td_verror(td, -err, "io_queue_init");
log_err("fio: check /proc/sys/fs/aio-max-nr\n");
free(ld);
return 1;
}
ld->aio_events = malloc(td->o.iodepth * sizeof(struct io_event));
memset(ld->aio_events, 0, td->o.iodepth * sizeof(struct io_event));
ld->iocbs = malloc(td->o.iodepth * sizeof(struct iocb *));
memset(ld->iocbs, 0, sizeof(struct iocb *));
ld->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
memset(ld->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
ld->iocbs_nr = 0;
td->io_ops->data = ld;
return 0;
}
static struct ioengine_ops ioengine = {
.name = "libaio",
.version = FIO_IOOPS_VERSION,
.init = fio_libaio_init,
.prep = fio_libaio_prep,
.queue = fio_libaio_queue,
.commit = fio_libaio_commit,
.cancel = fio_libaio_cancel,
.getevents = fio_libaio_getevents,
.event = fio_libaio_event,
.cleanup = fio_libaio_cleanup,
.open_file = generic_open_file,
.close_file = generic_close_file,
.get_file_size = generic_get_file_size,
};
#else /* FIO_HAVE_LIBAIO */
/*
* 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_libaio_init(struct thread_data fio_unused *td)
{
log_err("fio: libaio not available\n");
return 1;
}
static struct ioengine_ops ioengine = {
.name = "libaio",
.version = FIO_IOOPS_VERSION,
.init = fio_libaio_init,
};
#endif
static void fio_init fio_libaio_register(void)
{
register_ioengine(&ioengine);
}
static void fio_exit fio_libaio_unregister(void)
{
unregister_ioengine(&ioengine);
}