/*      $NetBSD: layer.h,v 1.17 2017/04/11 07:51:37 hannken Exp $       */

/*
* Copyright (c) 1999 National Aeronautics & Space Administration
* All rights reserved.
*
* This software was written by William Studenmund of the
* Numerical Aerospace Simulation Facility, NASA Ames Research Center.
*
* 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 National Aeronautics & Space Administration
*    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 NATIONAL AERONAUTICS & SPACE ADMINISTRATION
* ``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 ADMINISTRATION OR CONTRIB-
* UTORS 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) 1992, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This code is derived from software donated to Berkeley by
* Jan-Simon Pendry.
*
* 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: Id: lofs.h,v 1.8 1992/05/30 10:05:43 jsp Exp
*      @(#)null.h      8.2 (Berkeley) 1/21/94
*/

#ifndef _MISCFS_GENFS_LAYER_H_
#define _MISCFS_GENFS_LAYER_H_

struct layer_args {
       char    *target;                /* Target of loopback  */
       struct export_args30 _pad1; /* compat with old userland tools */
};

#ifdef _KERNEL

struct layer_mount {
       struct vnode            *layerm_rootvp; /* Ref to root layer_node */
       u_int                   layerm_flags;   /* mount point layer flags */
       u_int                   layerm_size;    /* size of fs's struct node */
       enum vtagtype           layerm_tag;     /* vtag of our vnodes */
       int                             /* bypass routine for this mount */
                               (*layerm_bypass)(void *);
       int                     (**layerm_vnodeop_p)    /* ops for our nodes */
                               (void *);
};

#define LAYERFS_MFLAGS          0x00000fff      /* reserved layer mount flags */
#define LAYERFS_MBYPASSDEBUG    0x00000001

/*
* A cache of vnode references
*/
struct layer_node {
       struct vnode            *layer_lowervp; /* VREFed once */
       struct vnode            *layer_vnode;   /* Back pointer */
       unsigned int            layer_flags;    /* locking, etc. */
};

#define LAYERFS_RESFLAGS        0x00000fff      /* flags reserved for layerfs */
#define LAYERFS_REMOVED         0x00000001      /* Did a remove on this node */

#define LAYERFS_DO_BYPASS(vp, ap)       \
       (*MOUNTTOLAYERMOUNT((vp)->v_mount)->layerm_bypass)((ap))

struct vnode *layer_checkvp(struct vnode *vp, const char *fil, int lno);

#define MOUNTTOLAYERMOUNT(mp) ((struct layer_mount *)((mp)->mnt_data))
#define VTOLAYER(vp) ((struct layer_node *)(vp)->v_data)
#define LAYERTOV(xp) ((xp)->layer_vnode)
#ifdef LAYERFS_DIAGNOSTIC
#define LAYERVPTOLOWERVP(vp) layer_checkvp((vp), __FILE__, __LINE__)
extern int layerfs_debug;
#else
#define LAYERVPTOLOWERVP(vp) (VTOLAYER(vp)->layer_lowervp)
#endif

#endif /* _KERNEL */
#endif /* _MISCFS_GENFS_LAYER_H_ */

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