FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/vdev_disk.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    /*
     * Copyright (C) 2008-2010 Lawrence Livermore National Security, LLC.
     * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
     * Written by Brian Behlendorf <behlendorf1@llnl.gov>.
     * LLNL-CODE-403049.
     * Copyright (c) 2018 by Delphix. All rights reserved.
     */
    
    #ifndef _SYS_VDEV_DISK_H
    #define _SYS_VDEV_DISK_H
    
    /*
     * Don't start the slice at the default block of 34; many storage
     * devices will use a stripe width of 128k, other vendors prefer a 1m
     * alignment.  It is best to play it safe and ensure a 1m alignment
     * given 512B blocks.  When the block size is larger by a power of 2
     * we will still be 1m aligned.  Some devices are sensitive to the
     * partition ending alignment as well.
     */
    #define NEW_START_BLOCK         2048
    #define PARTITION_END_ALIGNMENT 2048
    
    #ifdef _KERNEL
    #include <sys/vdev.h>
    #endif /* _KERNEL */
    #endif /* _SYS_VDEV_DISK_H */

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