FreeBSD/Linux Kernel Cross Reference
sys/sys/mdioctl.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1988 University of Utah.
      * Copyright (c) 1990, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * the Systems Programming Group of the University of Utah Computer
     * Science Department.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * from: Utah $Hdr: fdioctl.h 1.1 90/07/09$
     *
     *      @(#)vnioctl.h   8.1 (Berkeley) 6/10/93
     *
     * From: src/sys/sys/vnioctl.h,v 1.4
     *
     * $FreeBSD: releng/12.0/sys/sys/mdioctl.h 330881 2018-03-13 20:54:18Z brooks $
     */
    
    #ifndef _SYS_MDIOCTL_H_
    #define _SYS_MDIOCTL_H_
    
    enum md_types {MD_MALLOC, MD_PRELOAD, MD_VNODE, MD_SWAP, MD_NULL};
    
    /*
     * Ioctl definitions for memory disk pseudo-device.
     */
    
    #define MDNPAD          96
    struct md_ioctl {
            unsigned        md_version;     /* Structure layout version */
            unsigned        md_unit;        /* unit number */
            enum md_types   md_type ;       /* type of disk */
            char            *md_file;       /* pathname of file to mount */
            off_t           md_mediasize;   /* size of disk in bytes */
            unsigned        md_sectorsize;  /* sectorsize */
            unsigned        md_options;     /* options */
            u_int64_t       md_base;        /* base address */
            int             md_fwheads;     /* firmware heads */
            int             md_fwsectors;   /* firmware sectors */
            char            *md_label;      /* label of the device */
            int             md_pad[MDNPAD]; /* storage for MDIOCLIST */
    };
    
    #define MD_NAME         "md"
    #define MDCTL_NAME      "mdctl"
    #define MDIOVERSION     0
    
    /*
     * Before you can use a unit, it must be configured with MDIOCSET.
     * The configuration persists across opens and closes of the device;
     * an MDIOCCLR must be used to reset a configuration.  An attempt to
     * MDIOCSET an already active unit will return EBUSY.
     */
    
    #define MDIOCATTACH     _IOWR('m', 0, struct md_ioctl)  /* attach disk */
    #define MDIOCDETACH     _IOWR('m', 1, struct md_ioctl)  /* detach disk */
    #define MDIOCQUERY      _IOWR('m', 2, struct md_ioctl)  /* query status */
    #define MDIOCLIST       _IOWR('m', 3, struct md_ioctl)  /* query status */
    #define MDIOCRESIZE     _IOWR('m', 4, struct md_ioctl)  /* resize disk */
    
    #define MD_CLUSTER      0x01    /* Don't cluster */
    #define MD_RESERVE      0x02    /* Pre-reserve swap */
    #define MD_AUTOUNIT     0x04    /* Assign next free unit */
    #define MD_READONLY     0x08    /* Readonly mode */
    #define MD_COMPRESS     0x10    /* Compression mode */
    #define MD_FORCE        0x20    /* Don't try to prevent foot-shooting */
    #define MD_ASYNC        0x40    /* Asynchronous mode */
    #define MD_VERIFY       0x80    /* Open file with O_VERIFY (vnode only) */
    
    #endif  /* _SYS_MDIOCTL_H_*/

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