FreeBSD/Linux Kernel Cross Reference
sys/cddl/compat/opensolaris/sys/dkio.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 http://www.opensolaris.org/os/licensing.
     * 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
     *
     * $FreeBSD$
     */
    /*
     * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    #ifndef _OPENSOLARIS_SYS_DKIO_H_
    #define _OPENSOLARIS_SYS_DKIO_H_
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    /*
     * Disk io control commands
     * Warning: some other ioctls with the DIOC prefix exist elsewhere.
     * The Generic DKIOC numbers are from   0   -  50.
     *      The Floppy Driver uses          51  - 100.
     *      The Hard Disk (except SCSI)     101 - 106.      (these are obsolete)
     *      The CDROM Driver                151 - 200.
     *      The USCSI ioctl                 201 - 250.
     */
    #define DKIOC           (0x04 << 8)
    
    /*
     * The following ioctls are generic in nature and need to be
     * suported as appropriate by all disk drivers
     */
    #define DKIOCGGEOM      (DKIOC|1)               /* Get geometry */
    #define DKIOCINFO       (DKIOC|3)               /* Get info */
    #define DKIOCEJECT      (DKIOC|6)               /* Generic 'eject' */
    #define DKIOCGVTOC      (DKIOC|11)              /* Get VTOC */
    #define DKIOCSVTOC      (DKIOC|12)              /* Set VTOC & Write to Disk */
    
    /*
     * Disk Cache Controls.  These ioctls should be supported by
     * all disk drivers.
     *
     * DKIOCFLUSHWRITECACHE when used from user-mode ignores the ioctl
     * argument, but it should be passed as NULL to allow for future
     * reinterpretation.  From user-mode, this ioctl request is synchronous.
     *
     * When invoked from within the kernel, the arg can be NULL to indicate
     * a synchronous request or can be the address of a struct dk_callback
     * to request an asynchronous callback when the flush request is complete.
     * In this case, the flag to the ioctl must include FKIOCTL and the
     * dkc_callback field of the pointed to struct must be non-null or the
     * request is made synchronously.
     *
     * In the callback case: if the ioctl returns 0, a callback WILL be performed.
     * If the ioctl returns non-zero, a callback will NOT be performed.
     * NOTE: In some cases, the callback may be done BEFORE the ioctl call
     * returns.  The caller's locking strategy should be prepared for this case.
     */
    #define DKIOCFLUSHWRITECACHE    (DKIOC|34)      /* flush cache to phys medium */
    
    struct dk_callback {
            void (*dkc_callback)(void *dkc_cookie, int error);
            void *dkc_cookie;
    };
    
    #ifdef  __cplusplus
    }
    #endif
    
    #endif /* _OPENSOLARIS_SYS_DKIO_H_ */

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