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/*
* The io parts of the fio tool, includes workers for sync and mmap'ed
* io, as well as both posix and linux libaio support.
*
* sync io is implemented on top of aio.
*
* This is not really specific to fio, if the get_io_u/put_io_u and
* structures was pulled into this as well it would be a perfectly
* generic io engine that could be used for other projects.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <dlfcn.h>
#include "fio.h"
#include "os.h"
static int check_engine_ops(struct ioengine_ops *ops)
{
/*
* cpu thread doesn't need to provide anything
*/
if (ops->flags & FIO_CPUIO)
return 0;
if (!ops->event) {
log_err("%s: no event handler)\n", ops->name);
return 1;
}
if (!ops->getevents) {
log_err("%s: no getevents handler)\n", ops->name);
return 1;
}
if (!ops->queue) {
log_err("%s: no queue handler)\n", ops->name);
return 1;
}
return 0;
}
struct ioengine_ops *load_ioengine(struct thread_data *td, const char *name)
{
char engine[16], engine_lib[256];
struct ioengine_ops *ops, *ret;
void *dlhandle;
strcpy(engine, name);
/*
* linux libaio has alias names, so convert to what we want
*/
if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3))
strcpy(engine, "libaio");
sprintf(engine_lib, "%s/lib/fio/fio-engine-%s.o", fio_inst_prefix, engine);
dlerror();
dlhandle = dlopen(engine_lib, RTLD_LAZY);
if (!dlhandle) {
td_vmsg(td, -1, dlerror());
return NULL;
}
ops = dlsym(dlhandle, "ioengine");
if (!ops) {
td_vmsg(td, -1, dlerror());
dlclose(dlhandle);
return NULL;
}
if (ops->version != FIO_IOOPS_VERSION) {
log_err("bad ioops version %d (want %d)\n", ops->version, FIO_IOOPS_VERSION);
dlclose(dlhandle);
return NULL;
}
/*
* Check that the required methods are there.
*/
if (check_engine_ops(ops)) {
dlclose(dlhandle);
return NULL;
}
ret = malloc(sizeof(*ret));
memcpy(ret, ops, sizeof(*ret));
ret->data = NULL;
ret->dlhandle = dlhandle;
return ret;
}
void close_ioengine(struct thread_data *td)
{
if (td->io_ops->cleanup)
td->io_ops->cleanup(td);
dlclose(td->io_ops->dlhandle);
free(td->io_ops);
td->io_ops = NULL;
}
int td_io_prep(struct thread_data *td, struct io_u *io_u)
{
if (td->io_ops->prep && td->io_ops->prep(td, io_u))
return 1;
return 0;
}
int td_io_getevents(struct thread_data *td, int min, int max,
struct timespec *t)
{
return td->io_ops->getevents(td, min, max, t);
}
int td_io_queue(struct thread_data *td, struct io_u *io_u)
{
gettimeofday(&io_u->issue_time, NULL);
return td->io_ops->queue(td, io_u);
}
int td_io_init(struct thread_data *td)
{
if (td->io_ops->init)
return td->io_ops->init(td);
return 0;
}
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