Logo Search packages:      
Sourcecode: fio version File versions

posixaio.c

/*
 * 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;
      unsigned int queued;
};

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->queued--;
            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 posixaio_data *pd = td->io_ops->data;
      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 {
#ifdef FIO_HAVE_POSIXAIO_FSYNC
            ret = aio_fsync(O_SYNC, aiocb);
#else
            if (pd->queued)
                  return FIO_Q_BUSY;

            if (fsync(io_u->file->fd) < 0)
                  io_u->error = errno;

            return FIO_Q_COMPLETED;
#endif
      }
            
      if (ret) {
            io_u->error = errno;
            td_verror(td, io_u->error, "xfer");
            return FIO_Q_COMPLETED;
      }

      pd->queued++;
      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,
      .get_file_size    = generic_get_file_size,
};

#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);
}

Generated by  Doxygen 1.6.0   Back to index