FreeBSD/Linux Kernel Cross Reference
sys/dev/vndvar.h

     /*      $NetBSD: vndvar.h,v 1.38 2018/10/07 11:51:26 mlelstv Exp $      */
     
     /*-
      * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Jason R. Thorpe.
      *
     * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    
    /*
     * 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
     */
    
    #ifndef _SYS_DEV_VNDVAR_H_
    #define _SYS_DEV_VNDVAR_H_
    
    #include <sys/ioccom.h>
    #include <sys/pool.h>
    
    /*
     * Vnode disk pseudo-geometry information.
     */
    struct vndgeom {
            u_int32_t       vng_secsize;    /* # bytes per sector */
            u_int32_t       vng_nsectors;   /* # data sectors per track */
            u_int32_t       vng_ntracks;    /* # tracks per cylinder */
            u_int32_t       vng_ncylinders; /* # cylinders per unit */
    };
    
    /*
     * Ioctl definitions for file (vnode) disk pseudo-device.
     */
    struct vnd_ioctl {
            char            *vnd_file;      /* pathname of file to mount */
            int             vnd_flags;      /* flags; see below */
            struct vndgeom  vnd_geom;       /* geometry to emulate */
            unsigned int    vnd_osize;      /* (returned) size of disk */
            uint64_t        vnd_size;       /* (returned) size of disk */
    };
    
    /* vnd_flags */
    #define VNDIOF_HASGEOM  0x01            /* use specified geometry */
    #define VNDIOF_READONLY 0x02            /* as read-only device */
   #define VNDIOF_FORCE    0x04            /* force close */
   #define VNDIOF_FILEIO   0x08            /* have to use read/write */
   #define VNDIOF_COMP     0x0400          /* must stay the same as VNF_COMP */
   
   #ifdef _KERNEL
   
   struct vnode;
   
   /*
    * A vnode disk's state information.
    */
   struct vnd_softc {
           device_t         sc_dev;
           int              sc_flags;      /* flags */
           uint64_t         sc_size;       /* size of vnd */
           struct vnode    *sc_vp;         /* vnode */
           u_int            sc_iosize;     /* smallest I/O size for backend */
           kauth_cred_t     sc_cred;       /* credentials */
           int              sc_maxactive;  /* max # of active requests */
           struct bufq_state *sc_tab;      /* transfer queue */
           int              sc_pending;    /* number of pending transfers */
           int              sc_active;     /* number of active transfers */
           struct disk      sc_dkdev;      /* generic disk device info */
           struct vndgeom   sc_geom;       /* virtual geometry */
           struct pool      sc_vxpool;     /* vndxfer pool */
           struct pool      sc_vbpool;     /* vndbuf pool */
           struct lwp      *sc_kthread;    /* kernel thread */
           u_int32_t        sc_comp_blksz; /* precompressed block size */
           u_int32_t        sc_comp_numoffs;/* count of compressed block offsets */
           u_int64_t       *sc_comp_offsets;/* file idx's to compressed blocks */
           unsigned char   *sc_comp_buff;  /* compressed data buffer */
           unsigned char   *sc_comp_decombuf;/* decompressed data buffer */
           int32_t          sc_comp_buffblk;/*current decompressed block */
           z_stream         sc_comp_stream;/* decompress descriptor */
   };
   #endif
   
   /* sc_flags */
   #define VNF_INITED      0x001   /* unit has been initialized */
   #define VNF_WLABEL      0x002   /* label area is writable */
   #define VNF_LABELLING   0x004   /* unit is currently being labelled */
   #define VNF_WANTED      0x008   /* someone is waiting to obtain a lock */
   #define VNF_LOCKED      0x010   /* unit is locked */
   #define VNF_READONLY    0x020   /* unit is read-only */
   #define VNF_KLABEL      0x040   /* keep label on close */
   #define VNF_VLABEL      0x080   /* label is valid */
   #define VNF_KTHREAD     0x100   /* thread is running */
   #define VNF_VUNCONF     0x200   /* device is unconfiguring */
   #define VNF_COMP        0x400   /* file is compressed */
   #define VNF_CLEARING    0x800   /* unit is being torn down */
   #define VNF_USE_VN_RDWR 0x1000  /* have to use vn_rdwr() */
   
   /* structure of header in a compressed file */
   struct vnd_comp_header {
           char preamble[128];
           u_int32_t block_size;
           u_int32_t num_blocks;
   };
   
   /*
    * A simple structure for describing which vnd units are in use.
    */
   
   struct vnd_user {
           int             vnu_unit;       /* which vnd unit */
           dev_t           vnu_dev;        /* file is on this device... */
           ino_t           vnu_ino;        /* ...at this inode */
   };
   
   /*
    * Before you can use a unit, it must be configured with VNDIOCSET.
    * The configuration persists across opens and closes of the device;
    * an VNDIOCCLR must be used to reset a configuration.  An attempt to
    * VNDIOCSET an already active unit will return EBUSY.
    */
   #define VNDIOCSET       _IOWR('F', 0, struct vnd_ioctl) /* enable disk */
   #define VNDIOCCLR       _IOW('F', 1, struct vnd_ioctl)  /* disable disk */
   #define VNDIOCGET       _IOWR('F', 3, struct vnd_user)  /* get list */
   
   #ifdef _KERNEL
   /*
    * Everything else is kernel-private, mostly exported for compat/netbsd32.
    *
    * NetBSD 3.0 had a 32-bit value for vnu_ino.
    *
    * NetBSD 5.0 had a 32-bit value for vnu_dev, and vnd_size.
    */
   struct vnd_user30 {
           int             vnu_unit;       /* which vnd unit */
           uint32_t        vnu_dev;        /* file is on this device... */
           uint32_t        vnu_ino;        /* ...at this inode */
   };
   #define VNDIOCGET30     _IOWR('F', 2, struct vnd_user30)        /* get list */
   
   struct vnd_user50 {
           int             vnu_unit;       /* which vnd unit */
           uint32_t        vnu_dev;        /* file is on this device... */
           ino_t           vnu_ino;        /* ...at this inode */
   };
   #define VNDIOCGET50     _IOWR('F', 3, struct vnd_user50)        /* get list */
   
   struct vnd_ioctl50 {
           char            *vnd_file;      /* pathname of file to mount */
           int             vnd_flags;      /* flags; see below */
           struct vndgeom  vnd_geom;       /* geometry to emulate */
           unsigned int    vnd_size;       /* (returned) size of disk */
   };
   #define VNDIOCSET50     _IOWR('F', 0, struct vnd_ioctl50)
   #define VNDIOCCLR50     _IOW('F', 1, struct vnd_ioctl50)
   
   #endif /* _KERNEL */
   
   #endif /* _SYS_DEV_VNDVAR_H_ */

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