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;
}
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) {
uint64_t lastb;
lastb = last_block(td, f, ddir);
if (!lastb)
return 1;
return __get_next_rand_offset(td, f, ddir, b, lastb);
} 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);
else if (td->o.random_distribution == FIO_RAND_DIST_GAUSS)
return __get_next_rand_offset_gauss(td, f, ddir, b);
else if (td->o.random_distribution == FIO_RAND_DIST_ZONED)
return __get_next_rand_offset_zoned(td, f, ddir, b);
log_err("fio: unknown random distribution: %d\n", td->o.random_distribution);
return 1;
}
static int __get_next_rand_offset_zoned(struct thread_data *td,
struct fio_file *f, enum fio_ddir ddir,
uint64_t *b)
{
unsigned int v, send, stotal;
uint64_t offset, lastb;
static int warned;
struct zone_split_index *zsi;
lastb = last_block(td, f, ddir);
if (!lastb)
return 1;
if (!td->o.zone_split_nr[ddir]) {
bail:
return __get_next_rand_offset(td, f, ddir, b, lastb);
}
/*
* Generate a value, v, between 1 and 100, both inclusive
*/
v = rand32_between(&td->zone_state, 1, 100);
zsi = &td->zone_state_index[ddir][v - 1];
stotal = zsi->size_perc_prev;
send = zsi->size_perc;
/*
* Should never happen
*/
if (send == -1U) {
if (!warned) {
log_err("fio: bug in zoned generation\n");
warned = 1;
}
goto bail;
}
/*
* 'send' is some percentage below or equal to 100 that
* marks the end of the current IO range. 'stotal' marks
* the start, in percent.
*/
if (stotal)
offset = stotal * lastb / 100ULL;
else
offset = 0;
lastb = lastb * (send - stotal) / 100ULL;
/*
* Generate index from 0..send-of-lastb
*/
if (__get_next_rand_offset(td, f, ddir, b, lastb) == 1)
return 1;
/*
* Add our start offset, if any
*/
if (offset)
*b += offset;
return 0;
}
