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backend.c
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backend.c
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/*
* fio - the flexible io tester
*
* Copyright (C) 2005 Jens Axboe <axboe@suse.de>
* Copyright (C) 2006-2012 Jens Axboe <axboe@kernel.dk>
*
* The license below covers all files distributed with fio unless otherwise
* noted in the file itself.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <assert.h>
#include <inttypes.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <math.h>
#include <pthread.h>
#include "fio.h"
#include "smalloc.h"
#include "verify.h"
#include "diskutil.h"
#include "cgroup.h"
#include "profile.h"
#include "lib/rand.h"
#include "lib/memalign.h"
#include "server.h"
#include "lib/getrusage.h"
#include "idletime.h"
#include "err.h"
#include "workqueue.h"
#include "lib/mountcheck.h"
#include "rate-submit.h"
#include "helper_thread.h"
#include "pshared.h"
#include "zone-dist.h"
static struct fio_sem *startup_sem;
static struct flist_head *cgroup_list;
static struct cgroup_mnt *cgroup_mnt;
static int exit_value;
static volatile bool fio_abort;
static unsigned int nr_process = 0;
static unsigned int nr_thread = 0;
struct io_log *agg_io_log[DDIR_RWDIR_CNT];
int groupid = 0;
unsigned int thread_number = 0;
unsigned int stat_number = 0;
int shm_id = 0;
int temp_stall_ts;
unsigned long done_secs = 0;
pthread_mutex_t overlap_check = PTHREAD_MUTEX_INITIALIZER;
#define JOB_START_TIMEOUT (5 * 1000)
static void sig_int(int sig)
{
if (threads) {
if (is_backend)
fio_server_got_signal(sig);
else {
log_info("\nfio: terminating on signal %d\n", sig);
log_info_flush();
exit_value = 128;
}
fio_terminate_threads(TERMINATE_ALL);
}
}
void sig_show_status(int sig)
{
show_running_run_stats();
}
static void set_sig_handlers(void)
{
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_handler = sig_int;
act.sa_flags = SA_RESTART;
sigaction(SIGINT, &act, NULL);
memset(&act, 0, sizeof(act));
act.sa_handler = sig_int;
act.sa_flags = SA_RESTART;
sigaction(SIGTERM, &act, NULL);
/* Windows uses SIGBREAK as a quit signal from other applications */
#ifdef WIN32
memset(&act, 0, sizeof(act));
act.sa_handler = sig_int;
act.sa_flags = SA_RESTART;
sigaction(SIGBREAK, &act, NULL);
#endif
memset(&act, 0, sizeof(act));
act.sa_handler = sig_show_status;
act.sa_flags = SA_RESTART;
sigaction(SIGUSR1, &act, NULL);
if (is_backend) {
memset(&act, 0, sizeof(act));
act.sa_handler = sig_int;
act.sa_flags = SA_RESTART;
sigaction(SIGPIPE, &act, NULL);
}
}
/*
* Check if we are above the minimum rate given.
*/
static bool __check_min_rate(struct thread_data *td, struct timespec *now,
enum fio_ddir ddir)
{
unsigned long long bytes = 0;
unsigned long iops = 0;
unsigned long spent;
unsigned long rate;
unsigned int ratemin = 0;
unsigned int rate_iops = 0;
unsigned int rate_iops_min = 0;
assert(ddir_rw(ddir));
if (!td->o.ratemin[ddir] && !td->o.rate_iops_min[ddir])
return false;
/*
* allow a 2 second settle period in the beginning
*/
if (mtime_since(&td->start, now) < 2000)
return false;
iops += td->this_io_blocks[ddir];
bytes += td->this_io_bytes[ddir];
ratemin += td->o.ratemin[ddir];
rate_iops += td->o.rate_iops[ddir];
rate_iops_min += td->o.rate_iops_min[ddir];
/*
* if rate blocks is set, sample is running
*/
if (td->rate_bytes[ddir] || td->rate_blocks[ddir]) {
spent = mtime_since(&td->lastrate[ddir], now);
if (spent < td->o.ratecycle)
return false;
if (td->o.rate[ddir] || td->o.ratemin[ddir]) {
/*
* check bandwidth specified rate
*/
if (bytes < td->rate_bytes[ddir]) {
log_err("%s: rate_min=%uB/s not met, only transferred %lluB\n",
td->o.name, ratemin, bytes);
return true;
} else {
if (spent)
rate = ((bytes - td->rate_bytes[ddir]) * 1000) / spent;
else
rate = 0;
if (rate < ratemin ||
bytes < td->rate_bytes[ddir]) {
log_err("%s: rate_min=%uB/s not met, got %luB/s\n",
td->o.name, ratemin, rate);
return true;
}
}
} else {
/*
* checks iops specified rate
*/
if (iops < rate_iops) {
log_err("%s: rate_iops_min=%u not met, only performed %lu IOs\n",
td->o.name, rate_iops, iops);
return true;
} else {
if (spent)
rate = ((iops - td->rate_blocks[ddir]) * 1000) / spent;
else
rate = 0;
if (rate < rate_iops_min ||
iops < td->rate_blocks[ddir]) {
log_err("%s: rate_iops_min=%u not met, got %lu IOPS\n",
td->o.name, rate_iops_min, rate);
return true;
}
}
}
}
td->rate_bytes[ddir] = bytes;
td->rate_blocks[ddir] = iops;
memcpy(&td->lastrate[ddir], now, sizeof(*now));
return false;
}
static bool check_min_rate(struct thread_data *td, struct timespec *now)
{
bool ret = false;
if (td->bytes_done[DDIR_READ])
ret |= __check_min_rate(td, now, DDIR_READ);
if (td->bytes_done[DDIR_WRITE])
ret |= __check_min_rate(td, now, DDIR_WRITE);
if (td->bytes_done[DDIR_TRIM])
ret |= __check_min_rate(td, now, DDIR_TRIM);
return ret;
}
/*
* When job exits, we can cancel the in-flight IO if we are using async
* io. Attempt to do so.
*/
static void cleanup_pending_aio(struct thread_data *td)
{
int r;
if (td->error)
return;
/*
* get immediately available events, if any
*/
r = io_u_queued_complete(td, 0);
if (r < 0)
return;
/*
* now cancel remaining active events
*/
if (td->io_ops->cancel) {
struct io_u *io_u;
int i;
io_u_qiter(&td->io_u_all, io_u, i) {
if (io_u->flags & IO_U_F_FLIGHT) {
r = td->io_ops->cancel(td, io_u);
if (!r)
put_io_u(td, io_u);
}
}
}
if (td->cur_depth)
r = io_u_queued_complete(td, td->cur_depth);
}
/*
* Helper to handle the final sync of a file. Works just like the normal
* io path, just does everything sync.
*/
static bool fio_io_sync(struct thread_data *td, struct fio_file *f)
{
struct io_u *io_u = __get_io_u(td);
enum fio_q_status ret;
if (!io_u)
return true;
io_u->ddir = DDIR_SYNC;
io_u->file = f;
if (td_io_prep(td, io_u)) {
put_io_u(td, io_u);
return true;
}
requeue:
ret = td_io_queue(td, io_u);
switch (ret) {
case FIO_Q_QUEUED:
td_io_commit(td);
if (io_u_queued_complete(td, 1) < 0)
return true;
break;
case FIO_Q_COMPLETED:
if (io_u->error) {
td_verror(td, io_u->error, "td_io_queue");
return true;
}
if (io_u_sync_complete(td, io_u) < 0)
return true;
break;
case FIO_Q_BUSY:
td_io_commit(td);
goto requeue;
}
return false;
}
static int fio_file_fsync(struct thread_data *td, struct fio_file *f)
{
int ret;
if (fio_file_open(f))
return fio_io_sync(td, f);
if (td_io_open_file(td, f))
return 1;
ret = fio_io_sync(td, f);
td_io_close_file(td, f);
return ret;
}
static inline void __update_ts_cache(struct thread_data *td)
{
fio_gettime(&td->ts_cache, NULL);
}
static inline void update_ts_cache(struct thread_data *td)
{
if ((++td->ts_cache_nr & td->ts_cache_mask) == td->ts_cache_mask)
__update_ts_cache(td);
}
static inline bool runtime_exceeded(struct thread_data *td, struct timespec *t)
{
if (in_ramp_time(td))
return false;
if (!td->o.timeout)
return false;
if (utime_since(&td->epoch, t) >= td->o.timeout)
return true;
return false;
}
/*
* We need to update the runtime consistently in ms, but keep a running
* tally of the current elapsed time in microseconds for sub millisecond
* updates.
*/
static inline void update_runtime(struct thread_data *td,
unsigned long long *elapsed_us,
const enum fio_ddir ddir)
{
if (ddir == DDIR_WRITE && td_write(td) && td->o.verify_only)
return;
td->ts.runtime[ddir] -= (elapsed_us[ddir] + 999) / 1000;
elapsed_us[ddir] += utime_since_now(&td->start);
td->ts.runtime[ddir] += (elapsed_us[ddir] + 999) / 1000;
}
static bool break_on_this_error(struct thread_data *td, enum fio_ddir ddir,
int *retptr)
{
int ret = *retptr;
if (ret < 0 || td->error) {
int err = td->error;
enum error_type_bit eb;
if (ret < 0)
err = -ret;
eb = td_error_type(ddir, err);
if (!(td->o.continue_on_error & (1 << eb)))
return true;
if (td_non_fatal_error(td, eb, err)) {
/*
* Continue with the I/Os in case of
* a non fatal error.
*/
update_error_count(td, err);
td_clear_error(td);
*retptr = 0;
return false;
} else if (td->o.fill_device && err == ENOSPC) {
/*
* We expect to hit this error if
* fill_device option is set.
*/
td_clear_error(td);
fio_mark_td_terminate(td);
return true;
} else {
/*
* Stop the I/O in case of a fatal
* error.
*/
update_error_count(td, err);
return true;
}
}
return false;
}
static void check_update_rusage(struct thread_data *td)
{
if (td->update_rusage) {
td->update_rusage = 0;
update_rusage_stat(td);
fio_sem_up(td->rusage_sem);
}
}
static int wait_for_completions(struct thread_data *td, struct timespec *time)
{
const int full = queue_full(td);
int min_evts = 0;
int ret;
if (td->flags & TD_F_REGROW_LOGS)
return io_u_quiesce(td);
/*
* if the queue is full, we MUST reap at least 1 event
*/
min_evts = min(td->o.iodepth_batch_complete_min, td->cur_depth);
if ((full && !min_evts) || !td->o.iodepth_batch_complete_min)
min_evts = 1;
if (time && __should_check_rate(td))
fio_gettime(time, NULL);
do {
ret = io_u_queued_complete(td, min_evts);
if (ret < 0)
break;
} while (full && (td->cur_depth > td->o.iodepth_low));
return ret;
}
int io_queue_event(struct thread_data *td, struct io_u *io_u, int *ret,
enum fio_ddir ddir, uint64_t *bytes_issued, int from_verify,
struct timespec *comp_time)
{
switch (*ret) {
case FIO_Q_COMPLETED:
if (io_u->error) {
*ret = -io_u->error;
clear_io_u(td, io_u);
} else if (io_u->resid) {
long long bytes = io_u->xfer_buflen - io_u->resid;
struct fio_file *f = io_u->file;
if (bytes_issued)
*bytes_issued += bytes;
if (!from_verify)
trim_io_piece(io_u);
/*
* zero read, fail
*/
if (!bytes) {
if (!from_verify)
unlog_io_piece(td, io_u);
td_verror(td, EIO, "full resid");
put_io_u(td, io_u);
break;
}
io_u->xfer_buflen = io_u->resid;
io_u->xfer_buf += bytes;
io_u->offset += bytes;
if (ddir_rw(io_u->ddir))
td->ts.short_io_u[io_u->ddir]++;
if (io_u->offset == f->real_file_size)
goto sync_done;
requeue_io_u(td, &io_u);
} else {
sync_done:
if (comp_time && __should_check_rate(td))
fio_gettime(comp_time, NULL);
*ret = io_u_sync_complete(td, io_u);
if (*ret < 0)
break;
}
if (td->flags & TD_F_REGROW_LOGS)
regrow_logs(td);
/*
* when doing I/O (not when verifying),
* check for any errors that are to be ignored
*/
if (!from_verify)
break;
return 0;
case FIO_Q_QUEUED:
/*
* if the engine doesn't have a commit hook,
* the io_u is really queued. if it does have such
* a hook, it has to call io_u_queued() itself.
*/
if (td->io_ops->commit == NULL)
io_u_queued(td, io_u);
if (bytes_issued)
*bytes_issued += io_u->xfer_buflen;
break;
case FIO_Q_BUSY:
if (!from_verify)
unlog_io_piece(td, io_u);
requeue_io_u(td, &io_u);
td_io_commit(td);
break;
default:
assert(*ret < 0);
td_verror(td, -(*ret), "td_io_queue");
break;
}
if (break_on_this_error(td, ddir, ret))
return 1;
return 0;
}
static inline bool io_in_polling(struct thread_data *td)
{
return !td->o.iodepth_batch_complete_min &&
!td->o.iodepth_batch_complete_max;
}
/*
* Unlinks files from thread data fio_file structure
*/
static int unlink_all_files(struct thread_data *td)
{
struct fio_file *f;
unsigned int i;
int ret = 0;
for_each_file(td, f, i) {
if (f->filetype != FIO_TYPE_FILE)
continue;
ret = td_io_unlink_file(td, f);
if (ret)
break;
}
if (ret)
td_verror(td, ret, "unlink_all_files");
return ret;
}
/*
* Check if io_u will overlap an in-flight IO in the queue
*/
bool in_flight_overlap(struct io_u_queue *q, struct io_u *io_u)
{
bool overlap;
struct io_u *check_io_u;
unsigned long long x1, x2, y1, y2;
int i;
x1 = io_u->offset;
x2 = io_u->offset + io_u->buflen;
overlap = false;
io_u_qiter(q, check_io_u, i) {
if (check_io_u->flags & IO_U_F_FLIGHT) {
y1 = check_io_u->offset;
y2 = check_io_u->offset + check_io_u->buflen;
if (x1 < y2 && y1 < x2) {
overlap = true;
dprint(FD_IO, "in-flight overlap: %llu/%llu, %llu/%llu\n",
x1, io_u->buflen,
y1, check_io_u->buflen);
break;
}
}
}
return overlap;
}
static enum fio_q_status io_u_submit(struct thread_data *td, struct io_u *io_u)
{
/*
* Check for overlap if the user asked us to, and we have
* at least one IO in flight besides this one.
*/
if (td->o.serialize_overlap && td->cur_depth > 1 &&
in_flight_overlap(&td->io_u_all, io_u))
return FIO_Q_BUSY;
return td_io_queue(td, io_u);
}
/*
* The main verify engine. Runs over the writes we previously submitted,
* reads the blocks back in, and checks the crc/md5 of the data.
*/
static void do_verify(struct thread_data *td, uint64_t verify_bytes)
{
struct fio_file *f;
struct io_u *io_u;
int ret, min_events;
unsigned int i;
dprint(FD_VERIFY, "starting loop\n");
/*
* sync io first and invalidate cache, to make sure we really
* read from disk.
*/
for_each_file(td, f, i) {
if (!fio_file_open(f))
continue;
if (fio_io_sync(td, f))
break;
if (file_invalidate_cache(td, f))
break;
}
check_update_rusage(td);
if (td->error)
return;
/*
* verify_state needs to be reset before verification
* proceeds so that expected random seeds match actual
* random seeds in headers. The main loop will reset
* all random number generators if randrepeat is set.
*/
if (!td->o.rand_repeatable)
td_fill_verify_state_seed(td);
td_set_runstate(td, TD_VERIFYING);
io_u = NULL;
while (!td->terminate) {
enum fio_ddir ddir;
int full;
update_ts_cache(td);
check_update_rusage(td);
if (runtime_exceeded(td, &td->ts_cache)) {
__update_ts_cache(td);
if (runtime_exceeded(td, &td->ts_cache)) {
fio_mark_td_terminate(td);
break;
}
}
if (flow_threshold_exceeded(td))
continue;
if (!td->o.experimental_verify) {
io_u = __get_io_u(td);
if (!io_u)
break;
if (get_next_verify(td, io_u)) {
put_io_u(td, io_u);
break;
}
if (td_io_prep(td, io_u)) {
put_io_u(td, io_u);
break;
}
} else {
if (ddir_rw_sum(td->bytes_done) + td->o.rw_min_bs > verify_bytes)
break;
while ((io_u = get_io_u(td)) != NULL) {
if (IS_ERR_OR_NULL(io_u)) {
io_u = NULL;
ret = FIO_Q_BUSY;
goto reap;
}
/*
* We are only interested in the places where
* we wrote or trimmed IOs. Turn those into
* reads for verification purposes.
*/
if (io_u->ddir == DDIR_READ) {
/*
* Pretend we issued it for rwmix
* accounting
*/
td->io_issues[DDIR_READ]++;
put_io_u(td, io_u);
continue;
} else if (io_u->ddir == DDIR_TRIM) {
io_u->ddir = DDIR_READ;
io_u_set(td, io_u, IO_U_F_TRIMMED);
break;
} else if (io_u->ddir == DDIR_WRITE) {
io_u->ddir = DDIR_READ;
populate_verify_io_u(td, io_u);
break;
} else {
put_io_u(td, io_u);
continue;
}
}
if (!io_u)
break;
}
if (verify_state_should_stop(td, io_u)) {
put_io_u(td, io_u);
break;
}
if (td->o.verify_async)
io_u->end_io = verify_io_u_async;
else
io_u->end_io = verify_io_u;
ddir = io_u->ddir;
if (!td->o.disable_slat)
fio_gettime(&io_u->start_time, NULL);
ret = io_u_submit(td, io_u);
if (io_queue_event(td, io_u, &ret, ddir, NULL, 1, NULL))
break;
/*
* if we can queue more, do so. but check if there are
* completed io_u's first. Note that we can get BUSY even
* without IO queued, if the system is resource starved.
*/
reap:
full = queue_full(td) || (ret == FIO_Q_BUSY && td->cur_depth);
if (full || io_in_polling(td))
ret = wait_for_completions(td, NULL);
if (ret < 0)
break;
}
check_update_rusage(td);
if (!td->error) {
min_events = td->cur_depth;
if (min_events)
ret = io_u_queued_complete(td, min_events);
} else
cleanup_pending_aio(td);
td_set_runstate(td, TD_RUNNING);
dprint(FD_VERIFY, "exiting loop\n");
}
static bool exceeds_number_ios(struct thread_data *td)
{
unsigned long long number_ios;
if (!td->o.number_ios)
return false;
number_ios = ddir_rw_sum(td->io_blocks);
number_ios += td->io_u_queued + td->io_u_in_flight;
return number_ios >= (td->o.number_ios * td->loops);
}
static bool io_bytes_exceeded(struct thread_data *td, uint64_t *this_bytes)
{
unsigned long long bytes, limit;
if (td_rw(td))
bytes = this_bytes[DDIR_READ] + this_bytes[DDIR_WRITE];
else if (td_write(td))
bytes = this_bytes[DDIR_WRITE];
else if (td_read(td))
bytes = this_bytes[DDIR_READ];
else
bytes = this_bytes[DDIR_TRIM];
if (td->o.io_size)
limit = td->o.io_size;
else
limit = td->o.size;
limit *= td->loops;
return bytes >= limit || exceeds_number_ios(td);
}
static bool io_issue_bytes_exceeded(struct thread_data *td)
{
return io_bytes_exceeded(td, td->io_issue_bytes);
}
static bool io_complete_bytes_exceeded(struct thread_data *td)
{
return io_bytes_exceeded(td, td->this_io_bytes);
}
/*
* used to calculate the next io time for rate control
*
*/
static long long usec_for_io(struct thread_data *td, enum fio_ddir ddir)
{
uint64_t bps = td->rate_bps[ddir];
assert(!(td->flags & TD_F_CHILD));
if (td->o.rate_process == RATE_PROCESS_POISSON) {
uint64_t val, iops;
iops = bps / td->o.bs[ddir];
val = (int64_t) (1000000 / iops) *
-logf(__rand_0_1(&td->poisson_state[ddir]));
if (val) {
dprint(FD_RATE, "poisson rate iops=%llu, ddir=%d\n",
(unsigned long long) 1000000 / val,
ddir);
}
td->last_usec[ddir] += val;
return td->last_usec[ddir];
} else if (bps) {
uint64_t bytes = td->rate_io_issue_bytes[ddir];
uint64_t secs = bytes / bps;
uint64_t remainder = bytes % bps;
return remainder * 1000000 / bps + secs * 1000000;
}
return 0;
}
static void handle_thinktime(struct thread_data *td, enum fio_ddir ddir)
{
unsigned long long b;
uint64_t total;
int left;
b = ddir_rw_sum(td->io_blocks);
if (b % td->o.thinktime_blocks)
return;
io_u_quiesce(td);
total = 0;
if (td->o.thinktime_spin)
total = usec_spin(td->o.thinktime_spin);
left = td->o.thinktime - total;
if (left)
total += usec_sleep(td, left);
/*
* If we're ignoring thinktime for the rate, add the number of bytes
* we would have done while sleeping, minus one block to ensure we
* start issuing immediately after the sleep.
*/
if (total && td->rate_bps[ddir] && td->o.rate_ign_think) {
uint64_t missed = (td->rate_bps[ddir] * total) / 1000000ULL;
uint64_t bs = td->o.min_bs[ddir];
uint64_t usperop = bs * 1000000ULL / td->rate_bps[ddir];
uint64_t over;
if (usperop <= total)
over = bs;
else
over = (usperop - total) / usperop * -bs;
td->rate_io_issue_bytes[ddir] += (missed - over);
/* adjust for rate_process=poisson */
td->last_usec[ddir] += total;
}
}
/*
* Main IO worker function. It retrieves io_u's to process and queues
* and reaps them, checking for rate and errors along the way.
*
* Returns number of bytes written and trimmed.
*/
static void do_io(struct thread_data *td, uint64_t *bytes_done)
{
unsigned int i;
int ret = 0;
uint64_t total_bytes, bytes_issued = 0;
for (i = 0; i < DDIR_RWDIR_CNT; i++)
bytes_done[i] = td->bytes_done[i];
if (in_ramp_time(td))
td_set_runstate(td, TD_RAMP);
else
td_set_runstate(td, TD_RUNNING);
lat_target_init(td);
total_bytes = td->o.size;
/*
* Allow random overwrite workloads to write up to io_size
* before starting verification phase as 'size' doesn't apply.
*/
if (td_write(td) && td_random(td) && td->o.norandommap)
total_bytes = max(total_bytes, (uint64_t) td->o.io_size);
/*
* If verify_backlog is enabled, we'll run the verify in this
* handler as well. For that case, we may need up to twice the
* amount of bytes.
*/
if (td->o.verify != VERIFY_NONE &&
(td_write(td) && td->o.verify_backlog))
total_bytes += td->o.size;
/* In trimwrite mode, each byte is trimmed and then written, so
* allow total_bytes to be twice as big */
if (td_trimwrite(td))
total_bytes += td->total_io_size;
while ((td->o.read_iolog_file && !flist_empty(&td->io_log_list)) ||
(!flist_empty(&td->trim_list)) || !io_issue_bytes_exceeded(td) ||
td->o.time_based) {
struct timespec comp_time;
struct io_u *io_u;
int full;
enum fio_ddir ddir;
check_update_rusage(td);
if (td->terminate || td->done)
break;
update_ts_cache(td);
if (runtime_exceeded(td, &td->ts_cache)) {
__update_ts_cache(td);
if (runtime_exceeded(td, &td->ts_cache)) {
fio_mark_td_terminate(td);
break;
}
}
if (flow_threshold_exceeded(td))
continue;
/*
* Break if we exceeded the bytes. The exception is time
* based runs, but we still need to break out of the loop
* for those to run verification, if enabled.
* Jobs read from iolog do not use this stop condition.
*/
if (bytes_issued >= total_bytes &&
!td->o.read_iolog_file &&
(!td->o.time_based ||
(td->o.time_based && td->o.verify != VERIFY_NONE)))
break;
io_u = get_io_u(td);
if (IS_ERR_OR_NULL(io_u)) {
int err = PTR_ERR(io_u);
io_u = NULL;
ddir = DDIR_INVAL;
if (err == -EBUSY) {
ret = FIO_Q_BUSY;
goto reap;
}
if (td->o.latency_target)
goto reap;
break;
}
if (io_u->ddir == DDIR_WRITE && td->flags & TD_F_DO_VERIFY)
populate_verify_io_u(td, io_u);