157 lines
3.3 KiB
C
157 lines
3.3 KiB
C
/*
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* null engine
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*
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* IO engine that doesn't do any real IO transfers, it just pretends to.
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* The main purpose is to test fio itself.
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*
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* It also can act as external C++ engine - compiled with:
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*
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* g++ -O2 -g -shared -rdynamic -fPIC -o null.so null.c -DFIO_EXTERNAL_ENGINE
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <assert.h>
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#include "../fio.h"
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struct null_data {
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struct io_u **io_us;
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int queued;
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int events;
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};
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static struct io_u *fio_null_event(struct thread_data *td, int event)
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{
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struct null_data *nd = (struct null_data *) td->io_ops_data;
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return nd->io_us[event];
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}
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static int fio_null_getevents(struct thread_data *td, unsigned int min_events,
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unsigned int fio_unused max,
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const struct timespec fio_unused *t)
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{
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struct null_data *nd = (struct null_data *) td->io_ops_data;
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int ret = 0;
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if (min_events) {
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ret = nd->events;
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nd->events = 0;
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}
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return ret;
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}
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static int fio_null_commit(struct thread_data *td)
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{
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struct null_data *nd = (struct null_data *) td->io_ops_data;
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if (!nd->events) {
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#ifndef FIO_EXTERNAL_ENGINE
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io_u_mark_submit(td, nd->queued);
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#endif
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nd->events = nd->queued;
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nd->queued = 0;
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}
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return 0;
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}
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static int fio_null_queue(struct thread_data *td, struct io_u *io_u)
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{
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struct null_data *nd = (struct null_data *) td->io_ops_data;
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fio_ro_check(td, io_u);
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if (td->io_ops->flags & FIO_SYNCIO)
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return FIO_Q_COMPLETED;
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if (nd->events)
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return FIO_Q_BUSY;
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nd->io_us[nd->queued++] = io_u;
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return FIO_Q_QUEUED;
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}
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static int fio_null_open(struct thread_data fio_unused *td,
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struct fio_file fio_unused *f)
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{
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return 0;
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}
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static void fio_null_cleanup(struct thread_data *td)
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{
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struct null_data *nd = (struct null_data *) td->io_ops_data;
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if (nd) {
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free(nd->io_us);
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free(nd);
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}
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}
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static int fio_null_init(struct thread_data *td)
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{
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struct null_data *nd = (struct null_data *) malloc(sizeof(*nd));
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memset(nd, 0, sizeof(*nd));
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if (td->o.iodepth != 1) {
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nd->io_us = (struct io_u **) malloc(td->o.iodepth * sizeof(struct io_u *));
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memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
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} else
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td->io_ops->flags |= FIO_SYNCIO;
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td->io_ops_data = nd;
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return 0;
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}
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#ifndef __cplusplus
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static struct ioengine_ops ioengine = {
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.name = "null",
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.version = FIO_IOOPS_VERSION,
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.queue = fio_null_queue,
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.commit = fio_null_commit,
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.getevents = fio_null_getevents,
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.event = fio_null_event,
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.init = fio_null_init,
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.cleanup = fio_null_cleanup,
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.open_file = fio_null_open,
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.flags = FIO_DISKLESSIO | FIO_FAKEIO,
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};
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static void fio_init fio_null_register(void)
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{
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register_ioengine(&ioengine);
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}
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static void fio_exit fio_null_unregister(void)
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{
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unregister_ioengine(&ioengine);
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}
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#else
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#ifdef FIO_EXTERNAL_ENGINE
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extern "C" {
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static struct ioengine_ops ioengine;
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void get_ioengine(struct ioengine_ops **ioengine_ptr)
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{
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*ioengine_ptr = &ioengine;
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ioengine.name = "cpp_null";
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ioengine.version = FIO_IOOPS_VERSION;
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ioengine.queue = fio_null_queue;
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ioengine.commit = fio_null_commit;
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ioengine.getevents = fio_null_getevents;
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ioengine.event = fio_null_event;
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ioengine.init = fio_null_init;
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ioengine.cleanup = fio_null_cleanup;
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ioengine.open_file = fio_null_open;
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ioengine.flags = FIO_DISKLESSIO | FIO_FAKEIO;
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}
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}
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#endif /* FIO_EXTERNAL_ENGINE */
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#endif /* __cplusplus */
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