blob: 185314f05fd41f7bb6291217012f8c7f6f3f8beb [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 <assert.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;
}
if (!ops->queue) {
log_err("%s: no queue handler\n", ops->name);
return 1;
}
/*
* sync engines only need a ->queue()
*/
if (ops->flags & FIO_SYNCIO)
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);
}
void register_ioengine(struct ioengine_ops *ops)
{
INIT_LIST_HEAD(&ops->list);
list_add_tail(&ops->list, &engine_list);
}
static struct ioengine_ops *find_ioengine(const char *name)
{
struct ioengine_ops *ops;
struct list_head *entry;
list_for_each(entry, &engine_list) {
ops = list_entry(entry, struct ioengine_ops, list);
if (!strcmp(name, 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(), "dlopen");
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(), "dlsym");
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)
return td->io_ops->prep(td, io_u);
return 0;
}
int td_io_getevents(struct thread_data *td, int min, int max,
struct timespec *t)
{
if (min > 0 && td->io_ops->commit) {
int r = td->io_ops->commit(td);
if (r < 0)
return r;
}
if (td->io_ops->getevents)
return td->io_ops->getevents(td, min, max, t);
return 0;
}
int td_io_queue(struct thread_data *td, struct io_u *io_u)
{
int ret;
assert((io_u->flags & IO_U_F_FLIGHT) == 0);
io_u->flags |= IO_U_F_FLIGHT;
io_u->error = 0;
io_u->resid = 0;
if (td->io_ops->flags & FIO_SYNCIO) {
fio_gettime(&io_u->issue_time, NULL);
/*
* for a sync engine, set the timeout upfront
*/
if (mtime_since(&td->timeout_end, &io_u->issue_time) < IO_U_TIMEOUT)
io_u_set_timeout(td);
}
if (io_u->ddir != DDIR_SYNC)
td->io_issues[io_u->ddir]++;
io_u_mark_depth(td, io_u);
ret = td->io_ops->queue(td, io_u);
if (ret == FIO_Q_QUEUED || ret == FIO_Q_COMPLETED)
get_file(io_u->file);
if (ret == FIO_Q_QUEUED) {
int r;
td->io_u_queued++;
if (td->io_u_queued > td->iodepth_batch) {
r = td_io_commit(td);
if (r < 0)
return r;
}
}
if ((td->io_ops->flags & FIO_SYNCIO) == 0) {
fio_gettime(&io_u->issue_time, NULL);
/*
* async engine, set the timeout here
*/
if (ret == FIO_Q_QUEUED &&
mtime_since(&td->timeout_end, &io_u->issue_time) < IO_U_TIMEOUT)
io_u_set_timeout(td);
}
return ret;
}
int td_io_init(struct thread_data *td)
{
if (td->io_ops->init)
return td->io_ops->init(td);
return 0;
}
int td_io_commit(struct thread_data *td)
{
if (!td->cur_depth)
return 0;
td->io_u_queued = 0;
if (td->io_ops->commit)
return td->io_ops->commit(td);
return 0;
}
int td_io_open_file(struct thread_data *td, struct fio_file *f)
{
if (td->io_ops->open_file(td, f))
return 1;
f->last_free_lookup = 0;
f->last_completed_pos = 0;
f->last_pos = 0;
f->flags |= FIO_FILE_OPEN;
f->flags &= ~FIO_FILE_CLOSING;
if (f->file_map)
memset(f->file_map, 0, f->num_maps * sizeof(long));
td->nr_open_files++;
get_file(f);
return 0;
}
void td_io_close_file(struct thread_data *td, struct fio_file *f)
{
/*
* mark as closing, do real close when last io on it has completed
*/
f->flags |= FIO_FILE_CLOSING;
put_file(td, f);
}