blob: 1666612a9bf6dbe121e1c8a87c682e61786af228 [file] [log] [blame]
/*
* 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 LIST_HEAD(engine_list);
static int check_engine_ops(struct ioengine_ops *ops)
{
if (ops->version != FIO_IOOPS_VERSION) {
log_err("bad ioops version %d (want %d)\n", ops->version, FIO_IOOPS_VERSION);
return 1;
}
/*
* 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;
}
void unregister_ioengine(struct ioengine_ops *ops)
{
list_del(&ops->list);
INIT_LIST_HEAD(&ops->list);
}
int register_ioengine(struct ioengine_ops *ops)
{
if (check_engine_ops(ops))
return 1;
INIT_LIST_HEAD(&ops->list);
list_add_tail(&ops->list, &engine_list);
return 0;
}
static struct ioengine_ops *find_ioengine(const char *name)
{
struct ioengine_ops *ops;
struct list_head *entry;
char engine[16];
strncpy(engine, name, sizeof(engine) - 1);
if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3))
strcpy(engine, "libaio");
list_for_each(entry, &engine_list) {
ops = list_entry(entry, struct ioengine_ops, list);
if (!strcmp(engine, ops->name))
return ops;
}
return NULL;
}
static struct ioengine_ops *dlopen_ioengine(struct thread_data *td,
const char *engine_lib)
{
struct ioengine_ops *ops;
void *dlhandle;
dlerror();
dlhandle = dlopen(engine_lib, RTLD_LAZY);
if (!dlhandle) {
td_vmsg(td, -1, dlerror());
return NULL;
}
/*
* Unlike the included modules, external engines should have a
* non-static ioengine structure that we can reference.
*/
ops = dlsym(dlhandle, "ioengine");
if (!ops) {
td_vmsg(td, -1, dlerror());
dlclose(dlhandle);
return NULL;
}
ops->dlhandle = dlhandle;
return ops;
}
struct ioengine_ops *load_ioengine(struct thread_data *td, const char *name)
{
struct ioengine_ops *ops, *ret;
char engine[16];
strncpy(engine, name, sizeof(engine) - 1);
/*
* linux libaio has alias names, so convert to what we want
*/
if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3))
strcpy(engine, "libaio");
ops = find_ioengine(engine);
if (!ops)
ops = dlopen_ioengine(td, name);
if (!ops) {
log_err("fio: engine %s not loadable\n", name);
return NULL;
}
/*
* Check that the required methods are there.
*/
if (check_engine_ops(ops))
return NULL;
ret = malloc(sizeof(*ret));
memcpy(ret, ops, sizeof(*ret));
ret->data = NULL;
return ret;
}
void close_ioengine(struct thread_data *td)
{
if (td->io_ops->cleanup)
td->io_ops->cleanup(td);
if (td->io_ops->dlhandle)
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)
{
fio_gettime(&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;
}