blob: 95c433b7c006aa0817357bd6d4b2d94d0d4b68fb [file] [log] [blame]
/*
* TRIM/DISCARD support
*/
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <assert.h>
#include <pthread.h>
#include "fio.h"
#include "trim.h"
#ifdef FIO_HAVE_TRIM
int get_next_trim(struct thread_data *td, struct io_u *io_u)
{
struct io_piece *ipo;
/*
* this io_u is from a requeue, we already filled the offsets
*/
if (io_u->file)
return 0;
if (flist_empty(&td->trim_list))
return 1;
assert(td->trim_entries);
ipo = flist_first_entry(&td->trim_list, struct io_piece, trim_list);
remove_trim_entry(td, ipo);
io_u->offset = ipo->offset;
io_u->buflen = ipo->len;
io_u->file = ipo->file;
/*
* If not verifying that trimmed ranges return zeroed data,
* remove this from the to-read verify lists
*/
if (!td->o.trim_zero) {
if (ipo->flags & IP_F_ONLIST)
flist_del(&ipo->list);
else {
assert(ipo->flags & IP_F_ONRB);
rb_erase(&ipo->rb_node, &td->io_hist_tree);
}
td->io_hist_len--;
free(ipo);
} else
ipo->flags |= IP_F_TRIMMED;
if (!fio_file_open(io_u->file)) {
int r = td_io_open_file(td, io_u->file);
if (r) {
dprint(FD_VERIFY, "failed file %s open\n",
io_u->file->file_name);
return 1;
}
}
get_file(io_u->file);
assert(fio_file_open(io_u->file));
io_u->ddir = DDIR_TRIM;
io_u->xfer_buf = NULL;
io_u->xfer_buflen = io_u->buflen;
dprint(FD_VERIFY, "get_next_trim: ret io_u %p\n", io_u);
return 0;
}
int io_u_should_trim(struct thread_data *td, struct io_u *io_u)
{
unsigned long long val;
unsigned long r;
if (!td->o.trim_percentage)
return 0;
r = __rand(&td->trim_state);
val = (FRAND_MAX / 100ULL);
val *= (unsigned long long) td->o.trim_percentage;
return r <= val;
}
#endif