Function vdev_raidz_reconstruct_q

freebsd/contrib/openzfs/module/zfs/vdev_raidz.c:886–929

}

static int
vdev_raidz_reconstruct_q(raidz_row_t *rr, int *tgts, int ntgts)
{
	int x = tgts[0];
	int c, exp;
	abd_t *dst, *src;

	ASSERT(ntgts == 1);

	ASSERT(rr->rr_col[x].rc_size <= rr->rr_col[VDEV_RAIDZ_Q].rc_size);

	for (c = rr->rr_firstdatacol; c < rr->rr_cols; c++) {
		uint64_t size = (c == x) ? 0 : MIN(rr->rr_col[x].rc_size,
		    rr->rr_col[c].rc_size);

		src = rr->rr_col[c].rc_abd;
		dst = rr->rr_col[x].rc_abd;

		if (c == rr->rr_firstdatacol) {
			abd_copy(dst, src, size);
			if (rr->rr_col[x].rc_size > size) {
				abd_zero_off(dst, size,
				    rr->rr_col[x].rc_size - size);
			}
		} else {
			ASSERT3U(size, <=, rr->rr_col[x].rc_size);
			(void) abd_iterate_func2(dst, src, 0, 0, size,
			    vdev_raidz_reconst_q_pre_func, NULL);
			(void) abd_iterate_func(dst,
			    size, rr->rr_col[x].rc_size - size,
			    vdev_raidz_reconst_q_pre_tail_func, NULL);
		}
	}

	src = rr->rr_col[VDEV_RAIDZ_Q].rc_abd;
	dst = rr->rr_col[x].rc_abd;
	exp = 255 - (rr->rr_cols - 1 - x);

	struct reconst_q_struct rq = { abd_to_buf(src), exp };
	(void) abd_iterate_func(dst, 0, rr->rr_col[x].rc_size,
	    vdev_raidz_reconst_q_post_func, &rq);

	return (1 << VDEV_RAIDZ_Q);
}

static int
vdev_raidz_reconstruct_pq(raidz_row_t *rr, int *tgts, int ntgts)