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io_u.c
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#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <signal.h>
#include <time.h>
#include <assert.h>
#include "fio.h"
#include "hash.h"
#include "verify.h"
#include "trim.h"
#include "lib/rand.h"
#include "lib/axmap.h"
#include "err.h"
struct io_completion_data {
int nr; /* input */
int error; /* output */
uint64_t bytes_done[DDIR_RWDIR_CNT]; /* output */
struct timeval time; /* output */
};
/*
* The ->io_axmap contains a map of blocks we have or have not done io
* to yet. Used to make sure we cover the entire range in a fair fashion.
*/
static int random_map_free(struct fio_file *f, const uint64_t block)
{
return !axmap_isset(f->io_axmap, block);
}
/*
* Mark a given offset as used in the map.
*/
static void mark_random_map(struct thread_data *td, struct io_u *io_u)
{
unsigned int min_bs = td->o.rw_min_bs;
struct fio_file *f = io_u->file;
unsigned int nr_blocks;
uint64_t block;
block = (io_u->offset - f->file_offset) / (uint64_t) min_bs;
nr_blocks = (io_u->buflen + min_bs - 1) / min_bs;
if (!(io_u->flags & IO_U_F_BUSY_OK))
nr_blocks = axmap_set_nr(f->io_axmap, block, nr_blocks);
if ((nr_blocks * min_bs) < io_u->buflen)
io_u->buflen = nr_blocks * min_bs;
}
static uint64_t last_block(struct thread_data *td, struct fio_file *f,
enum fio_ddir ddir)
{
uint64_t max_blocks;
uint64_t max_size;
assert(ddir_rw(ddir));
/*
* Hmm, should we make sure that ->io_size <= ->real_file_size?
*/
max_size = f->io_size;
if (max_size > f->real_file_size)
max_size = f->real_file_size;
if (td->o.zone_range)
max_size = td->o.zone_range;
max_blocks = max_size / (uint64_t) td->o.ba[ddir];
if (!max_blocks)
return 0;
return max_blocks;
}
struct rand_off {
struct flist_head list;
uint64_t off;
};
static int __get_next_rand_offset(struct thread_data *td, struct fio_file *f,
enum fio_ddir ddir, uint64_t *b)
{
uint64_t r, lastb;
lastb = last_block(td, f, ddir);
if (!lastb)
return 1;
if (td->o.random_generator == FIO_RAND_GEN_TAUSWORTHE) {
uint64_t rmax;
rmax = td->o.use_os_rand ? OS_RAND_MAX : FRAND_MAX;
if (td->o.use_os_rand) {
rmax = OS_RAND_MAX;
r = os_random_long(&td->random_state);
} else {
rmax = FRAND_MAX;
r = __rand(&td->__random_state);
}
dprint(FD_RANDOM, "off rand %llu\n", (unsigned long long) r);
*b = lastb * (r / ((uint64_t) rmax + 1.0));
} else {
uint64_t off = 0;
if (lfsr_next(&f->lfsr, &off, lastb))
return 1;
*b = off;
}
/*
* if we are not maintaining a random map, we are done.
*/
if (!file_randommap(td, f))
goto ret;
/*
* calculate map offset and check if it's free
*/
if (random_map_free(f, *b))
goto ret;
dprint(FD_RANDOM, "get_next_rand_offset: offset %llu busy\n",
(unsigned long long) *b);
*b = axmap_next_free(f->io_axmap, *b);
if (*b == (uint64_t) -1ULL)
return 1;
ret:
return 0;
}
static int __get_next_rand_offset_zipf(struct thread_data *td,
struct fio_file *f, enum fio_ddir ddir,
uint64_t *b)
{
*b = zipf_next(&f->zipf);
return 0;
}
static int __get_next_rand_offset_pareto(struct thread_data *td,
struct fio_file *f, enum fio_ddir ddir,
uint64_t *b)
{
*b = pareto_next(&f->zipf);
return 0;
}
static int flist_cmp(void *data, struct flist_head *a, struct flist_head *b)
{
struct rand_off *r1 = flist_entry(a, struct rand_off, list);
struct rand_off *r2 = flist_entry(b, struct rand_off, list);
return r1->off - r2->off;
}
static int get_off_from_method(struct thread_data *td, struct fio_file *f,
enum fio_ddir ddir, uint64_t *b)
{
if (td->o.random_distribution == FIO_RAND_DIST_RANDOM)
return __get_next_rand_offset(td, f, ddir, b);
else if (td->o.random_distribution == FIO_RAND_DIST_ZIPF)
return __get_next_rand_offset_zipf(td, f, ddir, b);
else if (td->o.random_distribution == FIO_RAND_DIST_PARETO)
return __get_next_rand_offset_pareto(td, f, ddir, b);
log_err("fio: unknown random distribution: %d\n", td->o.random_distribution);
return 1;
}
/*
* Sort the reads for a verify phase in batches of verifysort_nr, if
* specified.
*/
static inline int should_sort_io(struct thread_data *td)
{
if (!td->o.verifysort_nr || !td->o.do_verify)
return 0;
if (!td_random(td))
return 0;
if (td->runstate != TD_VERIFYING)
return 0;
if (td->o.random_generator == FIO_RAND_GEN_TAUSWORTHE)
return 0;
return 1;
}
static int should_do_random(struct thread_data *td, enum fio_ddir ddir)
{
unsigned int v;
unsigned long r;
if (td->o.perc_rand[ddir] == 100)
return 1;
if (td->o.use_os_rand) {
r = os_random_long(&td->seq_rand_state[ddir]);
v = 1 + (int) (100.0 * (r / (OS_RAND_MAX + 1.0)));
} else {
r = __rand(&td->__seq_rand_state[ddir]);
v = 1 + (int) (100.0 * (r / (FRAND_MAX + 1.0)));
}
return v <= td->o.perc_rand[ddir];
}
static int get_next_rand_offset(struct thread_data *td, struct fio_file *f,
enum fio_ddir ddir, uint64_t *b)
{
struct rand_off *r;
int i, ret = 1;
if (!should_sort_io(td))
return get_off_from_method(td, f, ddir, b);
if (!flist_empty(&td->next_rand_list)) {
struct rand_off *r;
fetch:
r = flist_first_entry(&td->next_rand_list, struct rand_off, list);
flist_del(&r->list);
*b = r->off;
free(r);
return 0;
}
for (i = 0; i < td->o.verifysort_nr; i++) {
r = malloc(sizeof(*r));
ret = get_off_from_method(td, f, ddir, &r->off);
if (ret) {
free(r);
break;
}
flist_add(&r->list, &td->next_rand_list);
}
if (ret && !i)
return ret;
assert(!flist_empty(&td->next_rand_list));
flist_sort(NULL, &td->next_rand_list, flist_cmp);
goto fetch;
}
static int get_next_rand_block(struct thread_data *td, struct fio_file *f,
enum fio_ddir ddir, uint64_t *b)
{
if (!get_next_rand_offset(td, f, ddir, b))
return 0;
if (td->o.time_based) {
fio_file_reset(td, f);
if (!get_next_rand_offset(td, f, ddir, b))
return 0;
}
dprint(FD_IO, "%s: rand offset failed, last=%llu, size=%llu\n",
f->file_name, (unsigned long long) f->last_pos,
(unsigned long long) f->real_file_size);
return 1;
}
static int get_next_seq_offset(struct thread_data *td, struct fio_file *f,
enum fio_ddir ddir, uint64_t *offset)
{
assert(ddir_rw(ddir));
if (f->last_pos >= f->io_size + get_start_offset(td, f) && td->o.time_based)
f->last_pos = f->last_pos - f->io_size;
if (f->last_pos < f->real_file_size) {
uint64_t pos;
if (f->last_pos == f->file_offset && td->o.ddir_seq_add < 0)
f->last_pos = f->real_file_size;
pos = f->last_pos - f->file_offset;
if (pos)
pos += td->o.ddir_seq_add;
*offset = pos;
return 0;
}
return 1;
}
static int get_next_block(struct thread_data *td, struct io_u *io_u,
enum fio_ddir ddir, int rw_seq,
unsigned int *is_random)
{
struct fio_file *f = io_u->file;
uint64_t b, offset;
int ret;
assert(ddir_rw(ddir));
b = offset = -1ULL;
if (rw_seq) {
if (td_random(td)) {
if (should_do_random(td, ddir)) {
ret = get_next_rand_block(td, f, ddir, &b);
*is_random = 1;
} else {
*is_random = 0;
io_u->flags |= IO_U_F_BUSY_OK;
ret = get_next_seq_offset(td, f, ddir, &offset);
if (ret)
ret = get_next_rand_block(td, f, ddir, &b);
}
} else {
*is_random = 0;
ret = get_next_seq_offset(td, f, ddir, &offset);
}
} else {
io_u->flags |= IO_U_F_BUSY_OK;
*is_random = 0;
if (td->o.rw_seq == RW_SEQ_SEQ) {
ret = get_next_seq_offset(td, f, ddir, &offset);
if (ret) {
ret = get_next_rand_block(td, f, ddir, &b);
*is_random = 0;
}
} else if (td->o.rw_seq == RW_SEQ_IDENT) {
if (f->last_start != -1ULL)
offset = f->last_start - f->file_offset;
else
offset = 0;
ret = 0;
} else {
log_err("fio: unknown rw_seq=%d\n", td->o.rw_seq);
ret = 1;
}
}
if (!ret) {
if (offset != -1ULL)
io_u->offset = offset;
else if (b != -1ULL)
io_u->offset = b * td->o.ba[ddir];
else {
log_err("fio: bug in offset generation: offset=%llu, b=%llu\n", (unsigned long long) offset, (unsigned long long) b);
ret = 1;
}
}
return ret;
}
/*
* For random io, generate a random new block and see if it's used. Repeat
* until we find a free one. For sequential io, just return the end of
* the last io issued.
*/
static int __get_next_offset(struct thread_data *td, struct io_u *io_u,
unsigned int *is_random)
{
struct fio_file *f = io_u->file;
enum fio_ddir ddir = io_u->ddir;
int rw_seq_hit = 0;
assert(ddir_rw(ddir));
if (td->o.ddir_seq_nr && !--td->ddir_seq_nr) {
rw_seq_hit = 1;
td->ddir_seq_nr = td->o.ddir_seq_nr;
}
if (get_next_block(td, io_u, ddir, rw_seq_hit, is_random))
return 1;
if (io_u->offset >= f->io_size) {
dprint(FD_IO, "get_next_offset: offset %llu >= io_size %llu\n",
(unsigned long long) io_u->offset,
(unsigned long long) f->io_size);
return 1;
}
io_u->offset += f->file_offset;
if (io_u->offset >= f->real_file_size) {
dprint(FD_IO, "get_next_offset: offset %llu >= size %llu\n",
(unsigned long long) io_u->offset,
(unsigned long long) f->real_file_size);
return 1;
}
return 0;
}
static int get_next_offset(struct thread_data *td, struct io_u *io_u,
unsigned int *is_random)
{
if (td->flags & TD_F_PROFILE_OPS) {
struct prof_io_ops *ops = &td->prof_io_ops;
if (ops->fill_io_u_off)
return ops->fill_io_u_off(td, io_u, is_random);
}
return __get_next_offset(td, io_u, is_random);
}
static inline int io_u_fits(struct thread_data *td, struct io_u *io_u,
unsigned int buflen)
{
struct fio_file *f = io_u->file;
return io_u->offset + buflen <= f->io_size + get_start_offset(td, f);
}
static unsigned int __get_next_buflen(struct thread_data *td, struct io_u *io_u,
unsigned int is_random)
{
int ddir = io_u->ddir;
unsigned int buflen = 0;
unsigned int minbs, maxbs;
unsigned long r, rand_max;
assert(ddir_rw(ddir));
if (td->o.bs_is_seq_rand)
ddir = is_random ? DDIR_WRITE: DDIR_READ;
minbs = td->o.min_bs[ddir];
maxbs = td->o.max_bs[ddir];
if (minbs == maxbs)
return minbs;
/*
* If we can't satisfy the min block size from here, then fail
*/
if (!io_u_fits(td, io_u, minbs))
return 0;
if (td->o.use_os_rand)
rand_max = OS_RAND_MAX;
else
rand_max = FRAND_MAX;
do {
if (td->o.use_os_rand)
r = os_random_long(&td->bsrange_state);
else
r = __rand(&td->__bsrange_state);
if (!td->o.bssplit_nr[ddir]) {
buflen = 1 + (unsigned int) ((double) maxbs *
(r / (rand_max + 1.0)));
if (buflen < minbs)
buflen = minbs;
} else {
long perc = 0;
unsigned int i;
for (i = 0; i < td->o.bssplit_nr[ddir]; i++) {
struct bssplit *bsp = &td->o.bssplit[ddir][i];
buflen = bsp->bs;
perc += bsp->perc;
if ((r <= ((rand_max / 100L) * perc)) &&
io_u_fits(td, io_u, buflen))
break;
}
}
if (td->o.do_verify && td->o.verify != VERIFY_NONE)
buflen = (buflen + td->o.verify_interval - 1) &
~(td->o.verify_interval - 1);
if (!td->o.bs_unaligned && is_power_of_2(minbs))
buflen = (buflen + minbs - 1) & ~(minbs - 1);
} while (!io_u_fits(td, io_u, buflen));
return buflen;
}
static unsigned int get_next_buflen(struct thread_data *td, struct io_u *io_u,
unsigned int is_random)
{
if (td->flags & TD_F_PROFILE_OPS) {
struct prof_io_ops *ops = &td->prof_io_ops;
if (ops->fill_io_u_size)
return ops->fill_io_u_size(td, io_u, is_random);
}
return __get_next_buflen(td, io_u, is_random);
}
static void set_rwmix_bytes(struct thread_data *td)
{
unsigned int diff;
/*
* we do time or byte based switch. this is needed because
* buffered writes may issue a lot quicker than they complete,
* whereas reads do not.
*/
diff = td->o.rwmix[td->rwmix_ddir ^ 1];
td->rwmix_issues = (td->io_issues[td->rwmix_ddir] * diff) / 100;
}
static inline enum fio_ddir get_rand_ddir(struct thread_data *td)
{
unsigned int v;
unsigned long r;
if (td->o.use_os_rand) {
r = os_random_long(&td->rwmix_state);
v = 1 + (int) (100.0 * (r / (OS_RAND_MAX + 1.0)));
} else {
r = __rand(&td->__rwmix_state);
v = 1 + (int) (100.0 * (r / (FRAND_MAX + 1.0)));
}
if (v <= td->o.rwmix[DDIR_READ])
return DDIR_READ;
return DDIR_WRITE;
}
void io_u_quiesce(struct thread_data *td)
{
/*
* We are going to sleep, ensure that we flush anything pending as
* not to skew our latency numbers.
*
* Changed to only monitor 'in flight' requests here instead of the
* td->cur_depth, b/c td->cur_depth does not accurately represent
* io's that have been actually submitted to an async engine,
* and cur_depth is meaningless for sync engines.
*/
while (td->io_u_in_flight) {
int fio_unused ret;
ret = io_u_queued_complete(td, 1, NULL);
}
}
static enum fio_ddir rate_ddir(struct thread_data *td, enum fio_ddir ddir)
{
enum fio_ddir odir = ddir ^ 1;
struct timeval t;
long usec;
assert(ddir_rw(ddir));
if (td->rate_pending_usleep[ddir] <= 0)
return ddir;
/*
* We have too much pending sleep in this direction. See if we
* should switch.
*/
if (td_rw(td) && td->o.rwmix[odir]) {
/*
* Other direction does not have too much pending, switch
*/
if (td->rate_pending_usleep[odir] < 100000)
return odir;
/*
* Both directions have pending sleep. Sleep the minimum time
* and deduct from both.
*/
if (td->rate_pending_usleep[ddir] <=
td->rate_pending_usleep[odir]) {
usec = td->rate_pending_usleep[ddir];
} else {
usec = td->rate_pending_usleep[odir];
ddir = odir;
}
} else
usec = td->rate_pending_usleep[ddir];
io_u_quiesce(td);
fio_gettime(&t, NULL);
usec_sleep(td, usec);
usec = utime_since_now(&t);
td->rate_pending_usleep[ddir] -= usec;
odir = ddir ^ 1;
if (td_rw(td) && __should_check_rate(td, odir))
td->rate_pending_usleep[odir] -= usec;
if (ddir_trim(ddir))
return ddir;
return ddir;
}
/*
* Return the data direction for the next io_u. If the job is a
* mixed read/write workload, check the rwmix cycle and switch if
* necessary.
*/
static enum fio_ddir get_rw_ddir(struct thread_data *td)
{
enum fio_ddir ddir;
/*
* see if it's time to fsync
*/
if (td->o.fsync_blocks &&
!(td->io_issues[DDIR_WRITE] % td->o.fsync_blocks) &&
td->io_issues[DDIR_WRITE] && should_fsync(td))
return DDIR_SYNC;
/*
* see if it's time to fdatasync
*/
if (td->o.fdatasync_blocks &&
!(td->io_issues[DDIR_WRITE] % td->o.fdatasync_blocks) &&
td->io_issues[DDIR_WRITE] && should_fsync(td))
return DDIR_DATASYNC;
/*
* see if it's time to sync_file_range
*/
if (td->sync_file_range_nr &&
!(td->io_issues[DDIR_WRITE] % td->sync_file_range_nr) &&
td->io_issues[DDIR_WRITE] && should_fsync(td))
return DDIR_SYNC_FILE_RANGE;
if (td_rw(td)) {
/*
* Check if it's time to seed a new data direction.
*/
if (td->io_issues[td->rwmix_ddir] >= td->rwmix_issues) {
/*
* Put a top limit on how many bytes we do for
* one data direction, to avoid overflowing the
* ranges too much
*/
ddir = get_rand_ddir(td);
if (ddir != td->rwmix_ddir)
set_rwmix_bytes(td);
td->rwmix_ddir = ddir;
}
ddir = td->rwmix_ddir;
} else if (td_read(td))
ddir = DDIR_READ;
else if (td_write(td))
ddir = DDIR_WRITE;
else
ddir = DDIR_TRIM;
td->rwmix_ddir = rate_ddir(td, ddir);
return td->rwmix_ddir;
}
static void set_rw_ddir(struct thread_data *td, struct io_u *io_u)
{
io_u->ddir = io_u->acct_ddir = get_rw_ddir(td);
if (io_u->ddir == DDIR_WRITE && (td->io_ops->flags & FIO_BARRIER) &&
td->o.barrier_blocks &&
!(td->io_issues[DDIR_WRITE] % td->o.barrier_blocks) &&
td->io_issues[DDIR_WRITE])
io_u->flags |= IO_U_F_BARRIER;
}
void put_file_log(struct thread_data *td, struct fio_file *f)
{
unsigned int ret = put_file(td, f);
if (ret)
td_verror(td, ret, "file close");
}
void put_io_u(struct thread_data *td, struct io_u *io_u)
{
td_io_u_lock(td);
if (io_u->file && !(io_u->flags & IO_U_F_FREE_DEF))
put_file_log(td, io_u->file);
io_u->file = NULL;
io_u->flags &= ~IO_U_F_FREE_DEF;
io_u->flags |= IO_U_F_FREE;
if (io_u->flags & IO_U_F_IN_CUR_DEPTH)
td->cur_depth--;
io_u_qpush(&td->io_u_freelist, io_u);
td_io_u_unlock(td);
td_io_u_free_notify(td);
}
void clear_io_u(struct thread_data *td, struct io_u *io_u)
{
io_u->flags &= ~IO_U_F_FLIGHT;
put_io_u(td, io_u);
}
void requeue_io_u(struct thread_data *td, struct io_u **io_u)
{
struct io_u *__io_u = *io_u;
enum fio_ddir ddir = acct_ddir(__io_u);
dprint(FD_IO, "requeue %p\n", __io_u);
td_io_u_lock(td);
__io_u->flags |= IO_U_F_FREE;
if ((__io_u->flags & IO_U_F_FLIGHT) && ddir_rw(ddir))
td->io_issues[ddir]--;
__io_u->flags &= ~IO_U_F_FLIGHT;
if (__io_u->flags & IO_U_F_IN_CUR_DEPTH)
td->cur_depth--;
io_u_rpush(&td->io_u_requeues, __io_u);
td_io_u_unlock(td);
*io_u = NULL;
}
static int fill_io_u(struct thread_data *td, struct io_u *io_u)
{
unsigned int is_random;
if (td->io_ops->flags & FIO_NOIO)
goto out;
set_rw_ddir(td, io_u);
/*
* fsync() or fdatasync() or trim etc, we are done
*/
if (!ddir_rw(io_u->ddir))
goto out;
/*
* See if it's time to switch to a new zone
*/
if (td->zone_bytes >= td->o.zone_size && td->o.zone_skip) {
td->zone_bytes = 0;
io_u->file->file_offset += td->o.zone_range + td->o.zone_skip;
io_u->file->last_pos = io_u->file->file_offset;
td->io_skip_bytes += td->o.zone_skip;
}
/*
* No log, let the seq/rand engine retrieve the next buflen and
* position.
*/
if (get_next_offset(td, io_u, &is_random)) {
dprint(FD_IO, "io_u %p, failed getting offset\n", io_u);
return 1;
}
io_u->buflen = get_next_buflen(td, io_u, is_random);
if (!io_u->buflen) {
dprint(FD_IO, "io_u %p, failed getting buflen\n", io_u);
return 1;
}
if (io_u->offset + io_u->buflen > io_u->file->real_file_size) {
dprint(FD_IO, "io_u %p, offset too large\n", io_u);
dprint(FD_IO, " off=%llu/%lu > %llu\n",
(unsigned long long) io_u->offset, io_u->buflen,
(unsigned long long) io_u->file->real_file_size);
return 1;
}
/*
* mark entry before potentially trimming io_u
*/
if (td_random(td) && file_randommap(td, io_u->file))
mark_random_map(td, io_u);
out:
dprint_io_u(io_u, "fill_io_u");
td->zone_bytes += io_u->buflen;
return 0;
}
static void __io_u_mark_map(unsigned int *map, unsigned int nr)
{
int idx = 0;
switch (nr) {
default:
idx = 6;
break;
case 33 ... 64:
idx = 5;
break;
case 17 ... 32:
idx = 4;
break;
case 9 ... 16:
idx = 3;
break;
case 5 ... 8:
idx = 2;
break;
case 1 ... 4:
idx = 1;
case 0:
break;
}
map[idx]++;
}
void io_u_mark_submit(struct thread_data *td, unsigned int nr)
{
__io_u_mark_map(td->ts.io_u_submit, nr);
td->ts.total_submit++;
}
void io_u_mark_complete(struct thread_data *td, unsigned int nr)
{
__io_u_mark_map(td->ts.io_u_complete, nr);
td->ts.total_complete++;
}
void io_u_mark_depth(struct thread_data *td, unsigned int nr)
{
int idx = 0;
switch (td->cur_depth) {
default:
idx = 6;
break;
case 32 ... 63:
idx = 5;
break;
case 16 ... 31:
idx = 4;
break;
case 8 ... 15:
idx = 3;
break;
case 4 ... 7:
idx = 2;
break;
case 2 ... 3:
idx = 1;
case 1:
break;
}
td->ts.io_u_map[idx] += nr;
}
static void io_u_mark_lat_usec(struct thread_data *td, unsigned long usec)
{
int idx = 0;
assert(usec < 1000);
switch (usec) {
case 750 ... 999:
idx = 9;
break;
case 500 ... 749:
idx = 8;
break;
case 250 ... 499:
idx = 7;
break;
case 100 ... 249:
idx = 6;
break;
case 50 ... 99:
idx = 5;
break;
case 20 ... 49:
idx = 4;
break;
case 10 ... 19:
idx = 3;
break;
case 4 ... 9:
idx = 2;
break;
case 2 ... 3:
idx = 1;
case 0 ... 1:
break;
}
assert(idx < FIO_IO_U_LAT_U_NR);
td->ts.io_u_lat_u[idx]++;
}
static void io_u_mark_lat_msec(struct thread_data *td, unsigned long msec)
{
int idx = 0;
switch (msec) {
default:
idx = 11;
break;
case 1000 ... 1999:
idx = 10;
break;
case 750 ... 999:
idx = 9;
break;
case 500 ... 749:
idx = 8;
break;
case 250 ... 499:
idx = 7;
break;
case 100 ... 249:
idx = 6;
break;
case 50 ... 99:
idx = 5;
break;
case 20 ... 49:
idx = 4;
break;
case 10 ... 19:
idx = 3;
break;
case 4 ... 9:
idx = 2;
break;
case 2 ... 3:
idx = 1;
case 0 ... 1:
break;
}
assert(idx < FIO_IO_U_LAT_M_NR);
td->ts.io_u_lat_m[idx]++;
}
static void io_u_mark_latency(struct thread_data *td, unsigned long usec)
{
if (usec < 1000)
io_u_mark_lat_usec(td, usec);
else
io_u_mark_lat_msec(td, usec / 1000);
}
/*
* Get next file to service by choosing one at random
*/
static struct fio_file *get_next_file_rand(struct thread_data *td,
enum fio_file_flags goodf,
enum fio_file_flags badf)
{
struct fio_file *f;
int fno;
do {
int opened = 0;
unsigned long r;
if (td->o.use_os_rand) {
r = os_random_long(&td->next_file_state);
fno = (unsigned int) ((double) td->o.nr_files
* (r / (OS_RAND_MAX + 1.0)));
} else {
r = __rand(&td->__next_file_state);
fno = (unsigned int) ((double) td->o.nr_files
* (r / (FRAND_MAX + 1.0)));
}
f = td->files[fno];
if (fio_file_done(f))
continue;
if (!fio_file_open(f)) {
int err;
if (td->nr_open_files >= td->o.open_files)
return ERR_PTR(-EBUSY);
err = td_io_open_file(td, f);
if (err)
continue;
opened = 1;
}
if ((!goodf || (f->flags & goodf)) && !(f->flags & badf)) {
dprint(FD_FILE, "get_next_file_rand: %p\n", f);
return f;
}
if (opened)