Add vdev property to disable vdev scheduler

Added vdev property to disable the vdev scheduler.
The intention behind this property is to improve IOPS
performance when using o_direct.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: MigeljanImeri <ImeriMigel@gmail.com>
Closes #17358

module/os/freebsd/zfs/vdev_geom.c

@@ -968,6 +968,9 @@ skip_open:
 	else
 		vd->vdev_nonrot = B_FALSE;
 
+	/* Is backed by a block device. */
+	vd->vdev_is_blkdev = B_TRUE;
+
 	/* Set when device reports it supports TRIM. */
 	error = g_getattr("GEOM::candelete", cp, &has_trim);
 	vd->vdev_has_trim = (error == 0 && has_trim);

module/os/linux/zfs/vdev_disk.c

@@ -447,6 +447,9 @@ vdev_disk_open(vdev_t *v, uint64_t *psize, uint64_t *max_psize,
 	/* Inform the ZIO pipeline that we are non-rotational */
 	v->vdev_nonrot = blk_queue_nonrot(bdev_get_queue(bdev));
 
+	/* Is backed by a block device. */
+	v->vdev_is_blkdev = B_TRUE;
+
 	/* Physical volume size in bytes for the partition */
 	*psize = bdev_capacity(bdev);