static int __get_next_rand_offset(struct thread_data *td, struct fio_file *f,
enum fio_ddir ddir, uint64_t *b)
{
uint64_t r;
if (td->o.random_generator == FIO_RAND_GEN_TAUSWORTHE ||
td->o.random_generator == FIO_RAND_GEN_TAUSWORTHE64) {
uint64_t frand_max, lastb;
lastb = last_block(td, f, ddir);
if (!lastb)
return 1;
frand_max = rand_max(&td->random_state);
r = __rand(&td->random_state);
dprint(FD_RANDOM, "off rand %llu\n", (unsigned long long) r);
*b = lastb * (r / ((uint64_t) frand_max + 1.0));
} else {
uint64_t off = 0;
assert(fio_file_lfsr(f));
if (lfsr_next(&f->lfsr, &off))
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;
}
unsigned long long get_rand_file_size(struct thread_data *td)
{
unsigned long long ret, sized;
uint64_t frand_max;
unsigned long r;
frand_max = rand_max(&td->file_size_state);
r = __rand(&td->file_size_state);
sized = td->o.file_size_high - td->o.file_size_low;
ret = (unsigned long long) ((double) sized * (r / (frand_max + 1.0)));
ret += td->o.file_size_low;
ret -= (ret % td->o.rw_min_bs);
return ret;
}
static bool should_do_random(struct thread_data *td, enum fio_ddir ddir)
{
uint64_t frand_max;
unsigned int v;
unsigned long r;
if (td->o.perc_rand[ddir] == 100)
return true;
frand_max = rand_max(&td->seq_rand_state[ddir]);
r = __rand(&td->seq_rand_state[ddir]);
v = 1 + (int) (100.0 * (r / (frand_max + 1.0)));
return v <= td->o.perc_rand[ddir];
}