Function spa_vdev_remove_log

freebsd/contrib/openzfs/module/zfs/vdev_removal.c:1852–1963

* Remove a log device. The config lock is held for the specified TXG. */

 * Remove a log device.  The config lock is held for the specified TXG.
 */
static int
spa_vdev_remove_log(vdev_t *vd, uint64_t *txg)
{
	metaslab_group_t *mg = vd->vdev_mg;
	spa_t *spa = vd->vdev_spa;
	int error = 0;

	ASSERT(vd->vdev_islog);
	ASSERT(vd == vd->vdev_top);
	ASSERT(MUTEX_HELD(&spa_namespace_lock));

	/*
	 * Stop allocating from this vdev.
	 */
	metaslab_group_passivate(mg);

	/*
	 * Wait for the youngest allocations and frees to sync,
	 * and then wait for the deferral of those frees to finish.
	 */
	spa_vdev_config_exit(spa, NULL,
	    *txg + TXG_CONCURRENT_STATES + TXG_DEFER_SIZE, 0, FTAG);

	/*
	 * Cancel any initialize or TRIM which was in progress.
	 */
	vdev_initialize_stop_all(vd, VDEV_INITIALIZE_CANCELED);
	vdev_trim_stop_all(vd, VDEV_TRIM_CANCELED);
	vdev_autotrim_stop_wait(vd);

	/*
	 * Evacuate the device.  We don't hold the config lock as
	 * writer since we need to do I/O but we do keep the
	 * spa_namespace_lock held.  Once this completes the device
	 * should no longer have any blocks allocated on it.
	 */
	ASSERT(MUTEX_HELD(&spa_namespace_lock));
	if (vd->vdev_stat.vs_alloc != 0)
		error = spa_reset_logs(spa);

	*txg = spa_vdev_config_enter(spa);

	if (error != 0) {
		metaslab_group_activate(mg);
		return (error);
	}
	ASSERT0(vd->vdev_stat.vs_alloc);

	/*
	 * The evacuation succeeded.  Remove any remaining MOS metadata
	 * associated with this vdev, and wait for these changes to sync.
	 */
	vd->vdev_removing = B_TRUE;

	vdev_dirty_leaves(vd, VDD_DTL, *txg);
	vdev_config_dirty(vd);

	/*