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

     /*
      * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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
     *
     * $FreeBSD: src/sys/sys/vnioctl.h,v 1.4 1999/09/17 05:33:58 dillon Exp $
     */
    
    #ifndef _SYS_VNIOCTL_H_
    #define _SYS_VNIOCTL_H_
    
    #ifndef _SYS_IOCCOM_H_
    #include <sys/ioccom.h>
    #endif
    #ifndef _SYS_PARAM_H_
    #include <sys/param.h>          /* PATH_MAX */
    #endif
    
    /*
     * Ioctl definitions for file (vnode) disk pseudo-device.
     */
    
    #define _PATH_VNTAB     "/etc/vntab"    /* default config file */
    
    struct vn_ioctl {
            char    *vn_file;       /* pathname of file to mount */
            int64_t vn_size;        /* (returned) size of disk */
    };
    
    /*
     * Structure used by userland to query vn devices.
     *
     * In file-backed configurations, vnu_file will contain the full path to
     * the backing file, with vnu_dev and vnu_ino pointing to the appropriate
     * filesystem entries for that file.
     *
     * In swap-backed configurations, vnu_file will contain the token "swap",
     * with vnu_size and vnu_secsize indicating the portion of virtual memory
     * in use by the vnode disk.
     *
     * Todo: verify vnu_file within a jail - path disclosure problem ?
     */
    
    
    struct vn_user {
            int             vnu_unit;               /* vn unit */
            char            vnu_file[PATH_MAX];     /* vn description */
    #define _VN_USER_SWAP   "swap"                  /* indicates swap-backed vn */
            union {
                    dev_t           dev;            /* vn device */
                    u_int64_t       size;           /* size per vnu_secsize */
            } data1;
            union {
                    ino_t           ino;            /* vn inode */
                    int             secsize;        /* sector size */
            } data2;
    };
    #define vnu_dev         data1.dev
    #define vnu_size        data1.size
    #define vnu_ino         data2.ino
    #define vnu_secsize     data2.secsize
    
    /*
    * Before you can use a unit, it must be configured with VNIOCSET.
    * The configuration persists across opens and closes of the device;
    * an VNIOCCLR must be used to reset a configuration.  An attempt to
    * VNIOCSET an already active unit will return EBUSY.
    */
   #define VNIOCATTACH     _IOWR('F', 0, struct vn_ioctl)  /* attach file */
   #define VNIOCDETACH     _IOWR('F', 1, struct vn_ioctl)  /* detach disk */
   #define VNIOCGSET       _IOWR('F', 2, u_long )          /* set global option */
   #define VNIOCGCLEAR     _IOWR('F', 3, u_long )          /* reset --//-- */
   #define VNIOCUSET       _IOWR('F', 4, u_long )          /* set unit option */
   #define VNIOCUCLEAR     _IOWR('F', 5, u_long )          /* reset --//-- */
   #define VNIOCGET        _IOWR('F', 6, struct vn_user)   /* get disk info */
   
   #define VN_FOLLOW       0x2     /* Debug flow in vn driver */
   #define VN_DEBUG        0x4     /* Debug data in vn driver */
   #define VN_IO           0x8     /* Debug I/O in vn driver */
   #define VN_DONTCLUSTER  0x10    /* Don't cluster */
   #define VN_RESERVE      0x20    /* Pre-reserve swap */
   
   #endif  /* _SYS_VNIOCTL_H_*/

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