blob: 2969840706d18f75965c083c574531d9ff2fa7e0 [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"
static FLIST_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)
{
dprint(FD_IO, "ioengine %s unregistered\n", ops->name);
flist_del(&ops->list);
INIT_FLIST_HEAD(&ops->list);
}
void register_ioengine(struct ioengine_ops *ops)
{
dprint(FD_IO, "ioengine %s registered\n", ops->name);
INIT_FLIST_HEAD(&ops->list);
flist_add_tail(&ops->list, &engine_list);
}
static struct ioengine_ops *find_ioengine(const char *name)
{
struct ioengine_ops *ops;
struct flist_head *entry;
flist_for_each(entry, &engine_list) {
ops = flist_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;
dprint(FD_IO, "dload engine %s\n", engine_lib);
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];
dprint(FD_IO, "load ioengine %s\n", name);
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)
{
dprint(FD_IO, "close ioengine %s\n", td->io_ops->name);
if (td->io_ops->cleanup) {
td->io_ops->cleanup(td);
td->io_ops->data = NULL;
}
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)
{
dprint_io_u(io_u, "prep");
fio_ro_check(td, io_u);
lock_file(td, io_u->file, io_u->ddir);
if (td->io_ops->prep) {
int ret = td->io_ops->prep(td, io_u);
dprint(FD_IO, "->prep(%p)=%d\n", io_u, ret);
if (ret)
unlock_file(td, io_u->file);
return ret;
}
return 0;
}
int td_io_getevents(struct thread_data *td, unsigned int min, unsigned int max,
struct timespec *t)
{
int r = 0;
if (min > 0 && td->io_ops->commit) {
r = td->io_ops->commit(td);
if (r < 0)
goto out;
}
if (max > td->cur_depth)
max = td->cur_depth;
if (min > max)
max = min;
r = 0;
if (max && td->io_ops->getevents)
r = td->io_ops->getevents(td, min, max, t);
out:
if (r >= 0)
io_u_mark_complete(td, r);
dprint(FD_IO, "getevents: %d\n", r);
return r;
}
int td_io_queue(struct thread_data *td, struct io_u *io_u)
{
int ret;
dprint_io_u(io_u, "queue");
fio_ro_check(td, io_u);
assert((io_u->flags & IO_U_F_FLIGHT) == 0);
io_u->flags |= IO_U_F_FLIGHT;
assert(io_u->file->flags & FIO_FILE_OPEN);
io_u->error = 0;
io_u->resid = 0;
if (td->io_ops->flags & FIO_SYNCIO) {
if (fio_fill_issue_time(td))
fio_gettime(&io_u->issue_time, NULL);
/*
* only used for iolog
*/
if (td->o.read_iolog_file)
memcpy(&td->last_issue, &io_u->issue_time,
sizeof(struct timeval));
}
if (io_u->ddir != DDIR_SYNC)
td->io_issues[io_u->ddir]++;
ret = td->io_ops->queue(td, io_u);
unlock_file(td, io_u->file);
if (!td->io_ops->commit) {
io_u_mark_submit(td, 1);
io_u_mark_complete(td, 1);
}
if (ret == FIO_Q_COMPLETED) {
if (io_u->ddir != DDIR_SYNC) {
io_u_mark_depth(td, 1);
td->ts.total_io_u[io_u->ddir]++;
}
} else if (ret == FIO_Q_QUEUED) {
int r;
if (io_u->ddir != DDIR_SYNC) {
td->io_u_queued++;
td->ts.total_io_u[io_u->ddir]++;
}
if (td->io_u_queued >= td->o.iodepth_batch) {
r = td_io_commit(td);
if (r < 0)
return r;
}
}
if ((td->io_ops->flags & FIO_SYNCIO) == 0) {
if (fio_fill_issue_time(td))
fio_gettime(&io_u->issue_time, NULL);
/*
* only used for iolog
*/
if (td->o.read_iolog_file)
memcpy(&td->last_issue, &io_u->issue_time,
sizeof(struct timeval));
}
return ret;
}
int td_io_init(struct thread_data *td)
{
int ret = 0;
if (td->io_ops->init) {
ret = td->io_ops->init(td);
if (ret && td->o.iodepth > 1) {
log_err("fio: io engine init failed. Perhaps try"
" reducing io depth?\n");
}
}
return ret;
}
int td_io_commit(struct thread_data *td)
{
dprint(FD_IO, "calling ->commit(), depth %d\n", td->cur_depth);
if (!td->cur_depth || !td->io_u_queued)
return 0;
io_u_mark_depth(td, td->io_u_queued);
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)) {
if (td->error == EINVAL && td->o.odirect)
log_err("fio: destination does not support O_DIRECT\n");
if (td->error == EMFILE) {
log_err("fio: try reducing/setting openfiles (failed"
" at %u of %u)\n", td->nr_open_files,
td->o.nr_files);
}
return 1;
}
fio_file_reset(f);
f->flags |= FIO_FILE_OPEN;
f->flags &= ~FIO_FILE_CLOSING;
td->nr_open_files++;
get_file(f);
if (f->filetype == FIO_TYPE_PIPE) {
if (td_random(td)) {
log_err("fio: can't seek on pipes (no random io)\n");
goto err;
}
}
if (td->io_ops->flags & FIO_DISKLESSIO)
goto done;
if (td->o.invalidate_cache && file_invalidate_cache(td, f))
goto err;
if (td->o.fadvise_hint &&
(f->filetype == FIO_TYPE_BD || f->filetype == FIO_TYPE_FILE)) {
int flags;
if (td_random(td))
flags = POSIX_FADV_RANDOM;
else
flags = POSIX_FADV_SEQUENTIAL;
if (fadvise(f->fd, f->file_offset, f->io_size, flags) < 0) {
td_verror(td, errno, "fadvise");
goto err;
}
}
if (f->file_map)
memset(f->file_map, 0, f->num_maps * sizeof(int));
#ifdef FIO_OS_DIRECTIO
/*
* Some OS's have a distinct call to mark the file non-buffered,
* instead of using O_DIRECT (Solaris)
*/
if (td->o.odirect) {
int ret = fio_set_odirect(f->fd);
if (ret) {
td_verror(td, ret, "fio_set_odirect");
goto err;
}
}
#endif
done:
log_file(td, f, FIO_LOG_OPEN_FILE);
return 0;
err:
if (td->io_ops->close_file)
td->io_ops->close_file(td, f);
return 1;
}
int td_io_close_file(struct thread_data *td, struct fio_file *f)
{
if (!(f->flags & FIO_FILE_CLOSING))
log_file(td, f, FIO_LOG_CLOSE_FILE);
/*
* mark as closing, do real close when last io on it has completed
*/
f->flags |= FIO_FILE_CLOSING;
unlock_file_all(td, f);
return put_file(td, f);
}
int td_io_get_file_size(struct thread_data *td, struct fio_file *f)
{
if (!td->io_ops->get_file_size)
return 0;
return td->io_ops->get_file_size(td, f);
}