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Annotation of src/sys/miscfs/nullfs/null.h, Revision 1.12

1.12    ! wiz         1: /*     $NetBSD: null.h,v 1.11 2000/03/13 23:52:40 soren Exp $  */
1.10      wrstuden    2:
                      3: /*
                      4:  * Copyright (c) 1999 National Aeronautics & Space Administration
                      5:  * All rights reserved.
                      6:  *
1.12    ! wiz         7:  * This software was written by William Studenmund of the
        !             8:  * Numerical Aerospace Simulation Facility, NASA Ames Research Center.
1.10      wrstuden    9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
1.11      soren      18:  * 3. Neither the name of the National Aeronautics & Space Administration
1.10      wrstuden   19:  *    nor the names of its contributors may be used to endorse or promote
                     20:  *    products derived from this software without specific prior written
                     21:  *    permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE NATIONAL AERONAUTICS & SPACE ADMINISTRATION
                     24:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     25:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     26:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE ADMINISTRATION OR CONTRIB-
                     27:  * UTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
                     28:  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     29:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     30:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     31:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     32:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     33:  * POSSIBILITY OF SUCH DAMAGE.
                     34:  */
1.2       cgd        35:
1.1       mycroft    36: /*
                     37:  * Copyright (c) 1992, 1993
                     38:  *     The Regents of the University of California.  All rights reserved.
                     39:  *
                     40:  * This code is derived from software donated to Berkeley by
                     41:  * Jan-Simon Pendry.
                     42:  *
                     43:  * Redistribution and use in source and binary forms, with or without
                     44:  * modification, are permitted provided that the following conditions
                     45:  * are met:
                     46:  * 1. Redistributions of source code must retain the above copyright
                     47:  *    notice, this list of conditions and the following disclaimer.
                     48:  * 2. Redistributions in binary form must reproduce the above copyright
                     49:  *    notice, this list of conditions and the following disclaimer in the
                     50:  *    documentation and/or other materials provided with the distribution.
                     51:  * 3. All advertising materials mentioning features or use of this software
                     52:  *    must display the following acknowledgement:
                     53:  *     This product includes software developed by the University of
                     54:  *     California, Berkeley and its contributors.
                     55:  * 4. Neither the name of the University nor the names of its contributors
                     56:  *    may be used to endorse or promote products derived from this software
                     57:  *    without specific prior written permission.
                     58:  *
                     59:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     60:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     61:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     62:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     63:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     64:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     65:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     66:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     67:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     68:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     69:  * SUCH DAMAGE.
                     70:  *
                     71:  *     from: Id: lofs.h,v 1.8 1992/05/30 10:05:43 jsp Exp
1.2       cgd        72:  *     @(#)null.h      8.2 (Berkeley) 1/21/94
1.1       mycroft    73:  */
                     74:
1.10      wrstuden   75: #include <miscfs/genfs/layer.h>
                     76:
1.1       mycroft    77: struct null_args {
1.10      wrstuden   78:        struct  layer_args      la;     /* generic layerfs args */
1.1       mycroft    79: };
1.10      wrstuden   80: #define        nulla_target    la.target
                     81: #define        nulla_export    la.export
1.1       mycroft    82:
1.10      wrstuden   83: #ifdef _KERNEL
1.1       mycroft    84: struct null_mount {
1.10      wrstuden   85:        struct  layer_mount     lm;     /* generic layerfs mount stuff */
1.1       mycroft    86: };
1.10      wrstuden   87: #define        nullm_vfs               lm.layerm_vfs
                     88: #define        nullm_rootvp            lm.layerm_rootvp
                     89: #define        nullm_export            lm.layerm_export
                     90: #define        nullm_flags             lm.layerm_flags
                     91: #define        nullm_size              lm.layerm_size
                     92: #define        nullm_tag               lm.layerm_tag
                     93: #define        nullm_bypass            lm.layerm_bypass
                     94: #define        nullm_alloc             lm.layerm_alloc
                     95: #define        nullm_vnodeop_p         lm.layerm_vnodeop_p
                     96: #define        nullm_node_hashtbl      lm.layerm_node_hashtbl
                     97: #define        nullm_node_hash         lm.layerm_node_hash
                     98: #define        nullm_hashlock          lm.layerm_hashlock
1.1       mycroft    99:
                    100: /*
                    101:  * A cache of vnode references
                    102:  */
                    103: struct null_node {
1.10      wrstuden  104:        struct  layer_node      ln;
1.1       mycroft   105: };
1.10      wrstuden  106: #define        null_hash       ln.layer_hash
                    107: #define        null_lowervp    ln.layer_lowervp
                    108: #define        null_vnode      ln.layer_vnode
                    109: #define        null_flags      ln.layer_flags
1.1       mycroft   110:
1.10      wrstuden  111: int null_node_create __P((struct mount *mp, struct vnode *target, struct vnode **vpp));
1.1       mycroft   112:
                    113: #define        MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data))
                    114: #define        VTONULL(vp) ((struct null_node *)(vp)->v_data)
                    115: #define        NULLTOV(xp) ((xp)->null_vnode)
                    116: #ifdef NULLFS_DIAGNOSTIC
1.10      wrstuden  117: extern struct vnode *layer_checkvp __P((struct vnode *vp, char *fil, int lno));
                    118: #define        NULLVPTOLOWERVP(vp) layer_checkvp((vp), __FILE__, __LINE__)
1.1       mycroft   119: #else
                    120: #define        NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
                    121: #endif
                    122:
1.5       christos  123: extern int (**null_vnodeop_p) __P((void *));
1.9       thorpej   124: extern struct vfsops nullfs_vfsops;
1.5       christos  125:
                    126: void nullfs_init __P((void));
                    127:
1.4       briggs    128: #endif /* _KERNEL */

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