/*
* 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 {
long r = os_random_long(&td->next_file_state);
int opened = 0;
fno = (unsigned int) ((double) td->o.nr_files
* (r / (OS_RAND_MAX + 1.0)));
f = td->files[fno];
if (fio_file_done(f))
continue;
if (!fio_file_open(f)) {
int err;
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)
td_io_close_file(td, f);
} while (1);
}
/*
* Get next file to service by doing round robin between all available ones
*/
static struct fio_file *get_next_file_rr(struct thread_data *td, int goodf,
int badf)
{
unsigned int old_next_file = td->next_file;
struct fio_file *f;
do {
int opened = 0;
f = td->files[td->next_file];
td->next_file++;
if (td->next_file >= td->o.nr_files)
td->next_file = 0;
dprint(FD_FILE, "trying file %s %x\n", f->file_name, f->flags);
if (fio_file_done(f)) {
f = NULL;
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) {
dprint(FD_FILE, "error %d on open of %s\n",
err, f->file_name);
f = NULL;
continue;
}
opened = 1;
}
dprint(FD_FILE, "goodf=%x, badf=%x, ff=%x\n", goodf, badf,
f->flags);
if ((!goodf || (f->flags & goodf)) && !(f->flags & badf))
break;
if (opened)
td_io_close_file(td, f);
f = NULL;
} while (td->next_file != old_next_file);
dprint(FD_FILE, "get_next_file_rr: %p\n", f);
return f;
}