int
subprocess_flush_io (struct subprocess *p)
{
zio_flush (p->zio_in);
while (zio_read (p->zio_out) > 0) {};
while (zio_read (p->zio_err) > 0) {};
return (0);
}
int zio_read (zio_t *zio)
{
int n;
assert ((zio != NULL) && (zio->magic == ZIO_MAGIC));
if ((n = cbuf_write_from_fd (zio->buf, zio->srcfd, -1, NULL)) < 0)
return (-1);
zio_debug (zio, "zio_read: read = %d\n", n);
if (n == 0) {
zio_set_eof (zio);
zio_debug (zio, "zio_read_cb: Got eof\n");
}
zio_flush (zio);
return (n);
}
void
zil_flush_vdevs(zilog_t *zilog)
{
spa_t *spa = zilog->zl_spa;
avl_tree_t *t = &zilog->zl_vdev_tree;
void *cookie = NULL;
zil_vdev_node_t *zv;
zio_t *zio;
ASSERT(zilog->zl_writer);
/*
* We don't need zl_vdev_lock here because we're the zl_writer,
* and all zl_get_data() callbacks are done.
*/
if (avl_numnodes(t) == 0)
return;
spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL);
while ((zv = avl_destroy_nodes(t, &cookie)) != NULL) {
vdev_t *vd = vdev_lookup_top(spa, zv->zv_vdev);
if (vd != NULL)
zio_flush(zio, vd);
kmem_free(zv, sizeof (*zv));
}
/*
* Wait for all the flushes to complete. Not all devices actually
* support the DKIOCFLUSHWRITECACHE ioctl, so it's OK if it fails.
*/
(void) zio_wait(zio);
spa_config_exit(spa, SCL_STATE, FTAG);
}