Function vdev_cache_fill

freebsd/contrib/openzfs/module/zfs/vdev_cache.c:211–245

* Fill a previously allocated cache entry with data. */

 * Fill a previously allocated cache entry with data.
 */
static void
vdev_cache_fill(zio_t *fio)
{
	vdev_t *vd = fio->io_vd;
	vdev_cache_t *vc = &vd->vdev_cache;
	vdev_cache_entry_t *ve = fio->io_private;
	zio_t *pio;

	ASSERT3U(fio->io_size, ==, VCBS);

	/*
	 * Add data to the cache.
	 */
	mutex_enter(&vc->vc_lock);

	ASSERT3P(ve->ve_fill_io, ==, fio);
	ASSERT3U(ve->ve_offset, ==, fio->io_offset);
	ASSERT3P(ve->ve_abd, ==, fio->io_abd);

	ve->ve_fill_io = NULL;

	/*
	 * Even if this cache line was invalidated by a missed write update,
	 * any reads that were queued up before the missed update are still
	 * valid, so we can satisfy them from this line before we evict it.
	 */
	zio_link_t *zl = NULL;
	while ((pio = zio_walk_parents(fio, &zl)) != NULL)
		vdev_cache_hit(vc, ve, pio);

	if (fio->io_error || ve->ve_missed_update)
		vdev_cache_evict(vc, ve);

	mutex_exit(&vc->vc_lock);
}

/*
 * Read data from the cache.  Returns B_TRUE cache hit, B_FALSE on miss.