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      1 /*	$NetBSD: tmpfs_specops.c,v 1.16 2021/07/19 01:30:25 dholland Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2005 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
      9  * 2005 program.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 /*
     34  * tmpfs vnode interface for special devices.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 __KERNEL_RCSID(0, "$NetBSD: tmpfs_specops.c,v 1.16 2021/07/19 01:30:25 dholland Exp $");
     39 
     40 #include <sys/param.h>
     41 #include <sys/vnode.h>
     42 
     43 #include <fs/tmpfs/tmpfs.h>
     44 #include <fs/tmpfs/tmpfs_specops.h>
     45 
     46 /*
     47  * vnode operations vector used for special devices stored in a tmpfs
     48  * file system.
     49  */
     50 
     51 int (**tmpfs_specop_p)(void *);
     52 
     53 const struct vnodeopv_entry_desc tmpfs_specop_entries[] = {
     54 	{ &vop_default_desc,		vn_default_error },
     55 	GENFS_SPECOP_ENTRIES,
     56 	{ &vop_close_desc,		tmpfs_spec_close },
     57 	{ &vop_access_desc,		tmpfs_access },
     58 	{ &vop_accessx_desc,		genfs_accessx },
     59 	{ &vop_getattr_desc,		tmpfs_getattr },
     60 	{ &vop_setattr_desc,		tmpfs_setattr },
     61 	{ &vop_read_desc,		tmpfs_spec_read },
     62 	{ &vop_write_desc,		tmpfs_spec_write },
     63 	{ &vop_fcntl_desc,		genfs_fcntl },
     64 	{ &vop_fsync_desc,		spec_fsync },
     65 	{ &vop_inactive_desc,		tmpfs_inactive },
     66 	{ &vop_reclaim_desc,		tmpfs_reclaim },
     67 	{ &vop_lock_desc,		genfs_lock },
     68 	{ &vop_unlock_desc,		genfs_unlock },
     69 	{ &vop_print_desc,		tmpfs_print },
     70 	{ &vop_islocked_desc,		genfs_islocked },
     71 	{ &vop_bwrite_desc,		vn_bwrite },
     72 	{ NULL, NULL }
     73 };
     74 
     75 const struct vnodeopv_desc tmpfs_specop_opv_desc = {
     76 	&tmpfs_specop_p, tmpfs_specop_entries
     77 };
     78 
     79 int
     80 tmpfs_spec_close(void *v)
     81 {
     82 	struct vop_close_args /* {
     83 		struct vnode	*a_vp;
     84 		int		a_fflag;
     85 		kauth_cred_t	a_cred;
     86 	} */ *ap __unused = v;
     87 
     88 	return VOCALL(spec_vnodeop_p, VOFFSET(vop_close), v);
     89 }
     90 
     91 int
     92 tmpfs_spec_read(void *v)
     93 {
     94 	struct vop_read_args /* {
     95 		struct vnode *a_vp;
     96 		struct uio *a_uio;
     97 		int a_ioflag;
     98 		kauth_cred_t a_cred;
     99 	} */ *ap = v;
    100 	vnode_t *vp = ap->a_vp;
    101 
    102 	tmpfs_update(vp, TMPFS_UPDATE_ATIME);
    103 	return VOCALL(spec_vnodeop_p, VOFFSET(vop_read), v);
    104 }
    105 
    106 int
    107 tmpfs_spec_write(void *v)
    108 {
    109 	struct vop_write_args /* {
    110 		struct vnode *a_vp;
    111 		struct uio *a_uio;
    112 		int a_ioflag;
    113 		kauth_cred_t a_cred;
    114 	} */ *ap = v;
    115 	vnode_t *vp = ap->a_vp;
    116 
    117 	tmpfs_update(vp, TMPFS_UPDATE_MTIME);
    118 	return VOCALL(spec_vnodeop_p, VOFFSET(vop_write), v);
    119 }
    120