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Sourcecode: fio version File versions

libaio.c

/*
 * 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);
      else
            return 1;

      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;
}

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;
      int r;

      do {
            r = io_getevents(ld->aio_ctx, min, max, ld->aio_events, t);
            if (r >= (int) min)
                  break;
            else if (r == -EAGAIN) {
                  usleep(100);
                  continue;
            } else if (r == -EINTR)
                  continue;
            else if (r != 0)
                  break;
      } while (1);

      return r;
}

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 (io_u->ddir == DDIR_SYNC) {
            if (ld->iocbs_nr)
                  return FIO_Q_BUSY;
            if (fsync(io_u->file->fd) < 0)
                  io_u->error = errno;

            return FIO_Q_COMPLETED;
      } else if (io_u->ddir == DDIR_DATASYNC) {
            if (ld->iocbs_nr)
                  return FIO_Q_BUSY;
            if (fdatasync(io_u->file->fd) < 0)
                  io_u->error = errno;

            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)
{
      fprintf(stderr, "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);
}

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