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/*
* rbd engine
*
* IO engine using Ceph's librbd to test RADOS Block Devices.
*
*/
#include <rbd/librbd.h>
#include "../fio.h"
#include "../optgroup.h"
#ifdef CONFIG_RBD_POLL
/* add for poll */
#include <poll.h>
#include <sys/eventfd.h>
#endif
struct fio_rbd_iou {
struct io_u *io_u;
rbd_completion_t completion;
int io_seen;
int io_complete;
};
struct rbd_data {
rados_t cluster;
rados_ioctx_t io_ctx;
rbd_image_t image;
struct io_u **aio_events;
struct io_u **sort_events;
int fd; /* add for poll */
bool connected;
};
struct rbd_options {
void *pad;
char *cluster_name;
char *rbd_name;
char *pool_name;
char *client_name;
int busy_poll;
};
static struct fio_option options[] = {
{
.name = "clustername",
.lname = "ceph cluster name",
.type = FIO_OPT_STR_STORE,
.help = "Cluster name for ceph",
.off1 = offsetof(struct rbd_options, cluster_name),
.category = FIO_OPT_C_ENGINE,
.group = FIO_OPT_G_RBD,
},
{
.name = "rbdname",
.lname = "rbd engine rbdname",
.type = FIO_OPT_STR_STORE,
.help = "RBD name for RBD engine",
.off1 = offsetof(struct rbd_options, rbd_name),
.category = FIO_OPT_C_ENGINE,
.group = FIO_OPT_G_RBD,
},
{
.name = "pool",
.lname = "rbd engine pool",
.type = FIO_OPT_STR_STORE,
.help = "Name of the pool hosting the RBD for the RBD engine",
.off1 = offsetof(struct rbd_options, pool_name),
.category = FIO_OPT_C_ENGINE,
.group = FIO_OPT_G_RBD,
},
{
.name = "clientname",
.lname = "rbd engine clientname",
.type = FIO_OPT_STR_STORE,
.help = "Name of the ceph client to access the RBD for the RBD engine",
.off1 = offsetof(struct rbd_options, client_name),
.category = FIO_OPT_C_ENGINE,
.group = FIO_OPT_G_RBD,
},
{
.name = "busy_poll",
.lname = "Busy poll",
.type = FIO_OPT_BOOL,
.help = "Busy poll for completions instead of sleeping",
.off1 = offsetof(struct rbd_options, busy_poll),
.def = "0",
.category = FIO_OPT_C_ENGINE,
.group = FIO_OPT_G_RBD,
},
{
.name = NULL,
},
};
static int _fio_setup_rbd_data(struct thread_data *td,
struct rbd_data **rbd_data_ptr)
{
struct rbd_data *rbd;
if (td->io_ops_data)
return 0;
rbd = calloc(1, sizeof(struct rbd_data));
if (!rbd)
goto failed;
rbd->connected = false;
/* add for poll, init fd: -1 */
rbd->fd = -1;
rbd->aio_events = calloc(td->o.iodepth, sizeof(struct io_u *));
if (!rbd->aio_events)
goto failed;
rbd->sort_events = calloc(td->o.iodepth, sizeof(struct io_u *));
if (!rbd->sort_events)
goto failed;
*rbd_data_ptr = rbd;
return 0;
failed:
if (rbd) {
if (rbd->aio_events)
free(rbd->aio_events);
if (rbd->sort_events)
free(rbd->sort_events);
free(rbd);
}
return 1;
}
#ifdef CONFIG_RBD_POLL
static bool _fio_rbd_setup_poll(struct rbd_data *rbd)
{
int r;
/* add for rbd poll */
rbd->fd = eventfd(0, EFD_SEMAPHORE);
if (rbd->fd < 0) {
log_err("eventfd failed.\n");
return false;
}
r = rbd_set_image_notification(rbd->image, rbd->fd, EVENT_TYPE_EVENTFD);
if (r < 0) {
log_err("rbd_set_image_notification failed.\n");
close(rbd->fd);
rbd->fd = -1;
return false;
}
return true;
}
#else
static bool _fio_rbd_setup_poll(struct rbd_data *rbd)
{
return true;
}
#endif
static int _fio_rbd_connect(struct thread_data *td)
{
struct rbd_data *rbd = td->io_ops_data;
struct rbd_options *o = td->eo;
int r;
if (o->cluster_name) {
char *client_name = NULL;
/*
* If we specify cluser name, the rados_create2
* will not assume 'client.'. name is considered
* as a full type.id namestr
*/
if (o->client_name) {
if (!index(o->client_name, '.')) {
client_name = calloc(1, strlen("client.") +
strlen(o->client_name) + 1);
strcat(client_name, "client.");
strcat(client_name, o->client_name);
} else {
client_name = o->client_name;
}
}
r = rados_create2(&rbd->cluster, o->cluster_name,
client_name, 0);
if (client_name && !index(o->client_name, '.'))
free(client_name);
} else
r = rados_create(&rbd->cluster, o->client_name);
if (r < 0) {
log_err("rados_create failed.\n");
goto failed_early;
}
r = rados_conf_read_file(rbd->cluster, NULL);
if (r < 0) {
log_err("rados_conf_read_file failed.\n");
goto failed_early;
}
r = rados_connect(rbd->cluster);
if (r < 0) {
log_err("rados_connect failed.\n");
goto failed_shutdown;
}
r = rados_ioctx_create(rbd->cluster, o->pool_name, &rbd->io_ctx);
if (r < 0) {
log_err("rados_ioctx_create failed.\n");
goto failed_shutdown;
}
r = rbd_open(rbd->io_ctx, o->rbd_name, &rbd->image, NULL /*snap */ );
if (r < 0) {
log_err("rbd_open failed.\n");
goto failed_open;
}
if (!_fio_rbd_setup_poll(rbd))
goto failed_poll;
return 0;
failed_poll:
rbd_close(rbd->image);
rbd->image = NULL;
failed_open:
rados_ioctx_destroy(rbd->io_ctx);
rbd->io_ctx = NULL;
failed_shutdown:
rados_shutdown(rbd->cluster);
rbd->cluster = NULL;
failed_early:
return 1;
}
static void _fio_rbd_disconnect(struct rbd_data *rbd)
{
if (!rbd)
return;
/* close eventfd */
if (rbd->fd != -1) {
close(rbd->fd);
rbd->fd = -1;
}
/* shutdown everything */
if (rbd->image) {
rbd_close(rbd->image);
rbd->image = NULL;
}
if (rbd->io_ctx) {
rados_ioctx_destroy(rbd->io_ctx);
rbd->io_ctx = NULL;
}
if (rbd->cluster) {
rados_shutdown(rbd->cluster);
rbd->cluster = NULL;
}
}
static void _fio_rbd_finish_aiocb(rbd_completion_t comp, void *data)
{
struct fio_rbd_iou *fri = data;
struct io_u *io_u = fri->io_u;
ssize_t ret;
/*
* Looks like return value is 0 for success, or < 0 for
* a specific error. So we have to assume that it can't do
* partial completions.
*/
ret = rbd_aio_get_return_value(fri->completion);
if (ret < 0) {
io_u->error = -ret;
io_u->resid = io_u->xfer_buflen;
} else
io_u->error = 0;
fri->io_complete = 1;
}
static struct io_u *fio_rbd_event(struct thread_data *td, int event)
{
struct rbd_data *rbd = td->io_ops_data;
return rbd->aio_events[event];
}
static inline int fri_check_complete(struct rbd_data *rbd, struct io_u *io_u,
unsigned int *events)
{
struct fio_rbd_iou *fri = io_u->engine_data;
if (fri->io_complete) {
fri->io_seen = 1;
rbd->aio_events[*events] = io_u;
(*events)++;
rbd_aio_release(fri->completion);
return 1;
}
return 0;
}
#ifndef CONFIG_RBD_POLL
static inline int rbd_io_u_seen(struct io_u *io_u)
{
struct fio_rbd_iou *fri = io_u->engine_data;
return fri->io_seen;
}
#endif
static void rbd_io_u_wait_complete(struct io_u *io_u)
{
struct fio_rbd_iou *fri = io_u->engine_data;
rbd_aio_wait_for_complete(fri->completion);
}
static int rbd_io_u_cmp(const void *p1, const void *p2)
{
const struct io_u **a = (const struct io_u **) p1;
const struct io_u **b = (const struct io_u **) p2;
uint64_t at, bt;
at = utime_since_now(&(*a)->start_time);
bt = utime_since_now(&(*b)->start_time);
if (at < bt)
return -1;
else if (at == bt)
return 0;
else
return 1;
}
static int rbd_iter_events(struct thread_data *td, unsigned int *events,
unsigned int min_evts, int wait)
{
struct rbd_data *rbd = td->io_ops_data;
unsigned int this_events = 0;
struct io_u *io_u;
int i, sidx = 0;
#ifdef CONFIG_RBD_POLL
int ret = 0;
int event_num = 0;
struct fio_rbd_iou *fri = NULL;
rbd_completion_t comps[min_evts];
uint64_t counter;
bool completed;
struct pollfd pfd;
pfd.fd = rbd->fd;
pfd.events = POLLIN;
ret = poll(&pfd, 1, wait ? -1 : 0);
if (ret <= 0)
return 0;
if (!(pfd.revents & POLLIN))
return 0;
event_num = rbd_poll_io_events(rbd->image, comps, min_evts);
for (i = 0; i < event_num; i++) {
fri = rbd_aio_get_arg(comps[i]);
io_u = fri->io_u;
/* best effort to decrement the semaphore */
ret = read(rbd->fd, &counter, sizeof(counter));
if (ret <= 0)
log_err("rbd_iter_events failed to decrement semaphore.\n");
completed = fri_check_complete(rbd, io_u, events);
assert(completed);
this_events++;
}
#else
io_u_qiter(&td->io_u_all, io_u, i) {
if (!(io_u->flags & IO_U_F_FLIGHT))
continue;
if (rbd_io_u_seen(io_u))
continue;
if (fri_check_complete(rbd, io_u, events))
this_events++;
else if (wait)
rbd->sort_events[sidx++] = io_u;
}
#endif
if (!wait || !sidx)
return this_events;
/*
* Sort events, oldest issue first, then wait on as many as we
* need in order of age. If we have enough events, stop waiting,
* and just check if any of the older ones are done.
*/
if (sidx > 1)
qsort(rbd->sort_events, sidx, sizeof(struct io_u *), rbd_io_u_cmp);
for (i = 0; i < sidx; i++) {
io_u = rbd->sort_events[i];
if (fri_check_complete(rbd, io_u, events)) {
this_events++;
continue;
}
/*
* Stop waiting when we have enough, but continue checking
* all pending IOs if they are complete.
*/
if (*events >= min_evts)
continue;
rbd_io_u_wait_complete(io_u);
if (fri_check_complete(rbd, io_u, events))
this_events++;
}
return this_events;
}
static int fio_rbd_getevents(struct thread_data *td, unsigned int min,
unsigned int max, const struct timespec *t)
{
unsigned int this_events, events = 0;
struct rbd_options *o = td->eo;
int wait = 0;
do {
this_events = rbd_iter_events(td, &events, min, wait);
if (events >= min)
break;
if (this_events)
continue;
if (!o->busy_poll)
wait = 1;
else
nop;
} while (1);
return events;
}
static enum fio_q_status fio_rbd_queue(struct thread_data *td,
struct io_u *io_u)
{
struct rbd_data *rbd = td->io_ops_data;
struct fio_rbd_iou *fri = io_u->engine_data;
int r = -1;
fio_ro_check(td, io_u);
fri->io_seen = 0;
fri->io_complete = 0;
r = rbd_aio_create_completion(fri, _fio_rbd_finish_aiocb,
&fri->completion);
if (r < 0) {
log_err("rbd_aio_create_completion failed.\n");
goto failed;
}
if (io_u->ddir == DDIR_WRITE) {
r = rbd_aio_write(rbd->image, io_u->offset, io_u->xfer_buflen,
io_u->xfer_buf, fri->completion);
if (r < 0) {
log_err("rbd_aio_write failed.\n");
goto failed_comp;
}
} else if (io_u->ddir == DDIR_READ) {
r = rbd_aio_read(rbd->image, io_u->offset, io_u->xfer_buflen,
io_u->xfer_buf, fri->completion);
if (r < 0) {
log_err("rbd_aio_read failed.\n");
goto failed_comp;
}
} else if (io_u->ddir == DDIR_TRIM) {
r = rbd_aio_discard(rbd->image, io_u->offset,
io_u->xfer_buflen, fri->completion);
if (r < 0) {
log_err("rbd_aio_discard failed.\n");
goto failed_comp;
}
} else if (io_u->ddir == DDIR_SYNC) {
r = rbd_aio_flush(rbd->image, fri->completion);
if (r < 0) {
log_err("rbd_flush failed.\n");
goto failed_comp;
}
} else {
dprint(FD_IO, "%s: Warning: unhandled ddir: %d\n", __func__,
io_u->ddir);
r = -EINVAL;
goto failed_comp;
}
return FIO_Q_QUEUED;
failed_comp:
rbd_aio_release(fri->completion);
failed:
io_u->error = -r;
td_verror(td, io_u->error, "xfer");
return FIO_Q_COMPLETED;
}
static int fio_rbd_init(struct thread_data *td)
{
int r;
struct rbd_data *rbd = td->io_ops_data;
if (rbd->connected)
return 0;
r = _fio_rbd_connect(td);
if (r) {
log_err("fio_rbd_connect failed, return code: %d .\n", r);
goto failed;
}
return 0;
failed:
return 1;
}
static void fio_rbd_cleanup(struct thread_data *td)
{
struct rbd_data *rbd = td->io_ops_data;
if (rbd) {
_fio_rbd_disconnect(rbd);
free(rbd->aio_events);
free(rbd->sort_events);
free(rbd);
}
}
static int fio_rbd_setup(struct thread_data *td)
{
rbd_image_info_t info;
struct fio_file *f;
struct rbd_data *rbd = NULL;
int r;
/* allocate engine specific structure to deal with librbd. */
r = _fio_setup_rbd_data(td, &rbd);
if (r) {
log_err("fio_setup_rbd_data failed.\n");
goto cleanup;
}
td->io_ops_data = rbd;
/* librbd does not allow us to run first in the main thread and later
* in a fork child. It needs to be the same process context all the
* time.
*/
td->o.use_thread = 1;
/* connect in the main thread to determine to determine
* the size of the given RADOS block device. And disconnect
* later on.
*/
r = _fio_rbd_connect(td);
if (r) {
log_err("fio_rbd_connect failed.\n");
goto cleanup;
}
rbd->connected = true;
/* get size of the RADOS block device */
r = rbd_stat(rbd->image, &info, sizeof(info));
if (r < 0) {
log_err("rbd_status failed.\n");
goto cleanup;
} else if (info.size == 0) {
log_err("image size should be larger than zero.\n");
r = -EINVAL;
goto cleanup;
}
dprint(FD_IO, "rbd-engine: image size: %" PRIu64 "\n", info.size);
/* taken from "net" engine. Pretend we deal with files,
* even if we do not have any ideas about files.
* The size of the RBD is set instead of a artificial file.
*/
if (!td->files_index) {
add_file(td, td->o.filename ? : "rbd", 0, 0);
td->o.nr_files = td->o.nr_files ? : 1;
td->o.open_files++;
}
f = td->files[0];
f->real_file_size = info.size;
return 0;
cleanup:
fio_rbd_cleanup(td);
return r;
}
static int fio_rbd_open(struct thread_data *td, struct fio_file *f)
{
return 0;
}
static int fio_rbd_invalidate(struct thread_data *td, struct fio_file *f)
{
#if defined(CONFIG_RBD_INVAL)
struct rbd_data *rbd = td->io_ops_data;
return rbd_invalidate_cache(rbd->image);
#else
return 0;
#endif
}
static void fio_rbd_io_u_free(struct thread_data *td, struct io_u *io_u)
{
struct fio_rbd_iou *fri = io_u->engine_data;
if (fri) {
io_u->engine_data = NULL;
free(fri);
}
}
static int fio_rbd_io_u_init(struct thread_data *td, struct io_u *io_u)
{
struct fio_rbd_iou *fri;
fri = calloc(1, sizeof(*fri));
fri->io_u = io_u;
io_u->engine_data = fri;
return 0;
}
static struct ioengine_ops ioengine = {
.name = "rbd",
.version = FIO_IOOPS_VERSION,
.setup = fio_rbd_setup,
.init = fio_rbd_init,
.queue = fio_rbd_queue,
.getevents = fio_rbd_getevents,
.event = fio_rbd_event,
.cleanup = fio_rbd_cleanup,
.open_file = fio_rbd_open,
.invalidate = fio_rbd_invalidate,
.options = options,
.io_u_init = fio_rbd_io_u_init,
.io_u_free = fio_rbd_io_u_free,
.option_struct_size = sizeof(struct rbd_options),
};
static void fio_init fio_rbd_register(void)
{
register_ioengine(&ioengine);
}
static void fio_exit fio_rbd_unregister(void)
{
unregister_ioengine(&ioengine);
}
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