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      1 /*	$NetBSD: null_vnops.c,v 1.43 2020/05/16 18:31:51 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1999 National Aeronautics & Space Administration
      5  * All rights reserved.
      6  *
      7  * This software was written by William Studenmund of the
      8  * Numerical Aerospace Simulation Facility, NASA Ames Research Center.
      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.
     18  * 3. Neither the name of the National Aeronautics & Space Administration
     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  */
     35 
     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 contributed to Berkeley by
     41  * John Heidemann of the UCLA Ficus project.
     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. Neither the name of the University nor the names of its contributors
     52  *    may be used to endorse or promote products derived from this software
     53  *    without specific prior written permission.
     54  *
     55  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     56  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     57  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     58  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     59  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     60  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     61  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     62  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     63  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     64  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     65  * SUCH DAMAGE.
     66  *
     67  *	@(#)null_vnops.c	8.6 (Berkeley) 5/27/95
     68  *
     69  * Ancestors:
     70  *	@(#)lofs_vnops.c	1.2 (Berkeley) 6/18/92
     71  *      Id: lofs_vnops.c,v 1.11 1992/05/30 10:05:43 jsp Exp jsp
     72  *	...and...
     73  *	@(#)null_vnodeops.c 1.20 92/07/07 UCLA Ficus project
     74  */
     75 
     76 /*
     77  * Null file-system.
     78  *
     79  * Implemented using layerfs, see layer_vnops.c for a description.
     80  */
     81 
     82 #include <sys/cdefs.h>
     83 __KERNEL_RCSID(0, "$NetBSD: null_vnops.c,v 1.43 2020/05/16 18:31:51 christos Exp $");
     84 
     85 #include <sys/param.h>
     86 #include <sys/systm.h>
     87 #include <sys/vnode.h>
     88 
     89 #include <miscfs/genfs/genfs.h>
     90 #include <miscfs/genfs/layer_extern.h>
     91 #include <miscfs/nullfs/null.h>
     92 
     93 /*
     94  * Global VFS data structures.
     95  */
     96 
     97 int (**null_vnodeop_p)(void *);
     98 
     99 const struct vnodeopv_entry_desc null_vnodeop_entries[] = {
    100 	{ &vop_default_desc,	layer_bypass },
    101 
    102 	{ &vop_lookup_desc,	layer_lookup },
    103 	{ &vop_setattr_desc,	layer_setattr },
    104 	{ &vop_getattr_desc,	layer_getattr },
    105 	{ &vop_access_desc,	layer_access },
    106 	{ &vop_accessx_desc,	genfs_accessx },
    107 	{ &vop_fsync_desc,	layer_fsync },
    108 	{ &vop_inactive_desc,	layer_inactive },
    109 	{ &vop_reclaim_desc,	layer_reclaim },
    110 	{ &vop_print_desc,	layer_print },
    111 	{ &vop_remove_desc,	layer_remove },
    112 	{ &vop_rename_desc,	layer_rename },
    113 	{ &vop_revoke_desc,	layer_revoke },
    114 	{ &vop_rmdir_desc,	layer_rmdir },
    115 
    116 	{ &vop_open_desc,	layer_open },	/* mount option handling */
    117 	{ &vop_close_desc,	layer_close },
    118 
    119 	{ &vop_bmap_desc,	layer_bmap },
    120 	{ &vop_getpages_desc,	layer_getpages },
    121 	{ &vop_putpages_desc,	layer_putpages },
    122 
    123 	{ NULL, NULL }
    124 };
    125 
    126 const struct vnodeopv_desc null_vnodeop_opv_desc = {
    127 	&null_vnodeop_p, null_vnodeop_entries
    128 };
    129