vfs_default.c revision 30492 
1/*
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed
6 * to Berkeley by John Heidemann of the UCLA Ficus project.
7 *
8 * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project
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. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 */
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/kernel.h>
43#include <sys/mount.h>
44#include <sys/unistd.h>
45#include <sys/vnode.h>
46
47static int vop_nostrategy __P((struct vop_strategy_args *));
48
49/*
50 * This vnode table stores what we want to do if the filesystem doesn't
51 * implement a particular VOP.
52 *
53 * If there is no specific entry here, we will return EOPNOTSUPP.
54 *
55 */
56
57vop_t **default_vnodeop_p;
58static struct vnodeopv_entry_desc default_vnodeop_entries[] = {
59	{ &vop_default_desc,		(vop_t *) vop_eopnotsupp },
60	{ &vop_abortop_desc,		(vop_t *) nullop },
61	{ &vop_advlock_desc,		(vop_t *) vop_einval },
62	{ &vop_bwrite_desc,		(vop_t *) vn_bwrite },
63	{ &vop_close_desc,		(vop_t *) vop_null },
64	{ &vop_fsync_desc,		(vop_t *) vop_null },
65	{ &vop_ioctl_desc,		(vop_t *) vop_enotty },
66	{ &vop_lease_desc,		(vop_t *) lease_check },
67	{ &vop_mmap_desc,		(vop_t *) vop_einval },
68	{ &vop_open_desc,		(vop_t *) vop_null },
69	{ &vop_pathconf_desc,		(vop_t *) vop_einval },
70	{ &vop_poll_desc,		(vop_t *) vop_nopoll },
71	{ &vop_readlink_desc,		(vop_t *) vop_einval },
72	{ &vop_reallocblks_desc,	(vop_t *) vop_eopnotsupp },
73	{ &vop_revoke_desc,		(vop_t *) vop_revoke },
74	{ &vop_strategy_desc,		(vop_t *) vop_nostrategy },
75	{ NULL, NULL }
76};
77
78static struct vnodeopv_desc default_vnodeop_opv_desc =
79        { &default_vnodeop_p, default_vnodeop_entries };
80
81VNODEOP_SET(default_vnodeop_opv_desc);
82
83int
84vop_eopnotsupp(struct vop_generic_args *ap)
85{
86	/*
87	printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name);
88	*/
89
90	return (EOPNOTSUPP);
91}
92
93int
94vop_ebadf(struct vop_generic_args *ap)
95{
96
97	return (EBADF);
98}
99
100int
101vop_enotty(struct vop_generic_args *ap)
102{
103
104	return (ENOTTY);
105}
106
107int
108vop_einval(struct vop_generic_args *ap)
109{
110
111	return (EINVAL);
112}
113
114int
115vop_null(struct vop_generic_args *ap)
116{
117
118	return (0);
119}
120
121int
122vop_defaultop(struct vop_generic_args *ap)
123{
124
125	return (VOCALL(default_vnodeop_p, ap->a_desc->vdesc_offset, ap));
126}
127
128static int
129vop_nostrategy (struct vop_strategy_args *ap)
130{
131	printf("No strategy for buffer at %p\n", ap->a_bp);
132	vprint("", ap->a_bp->b_vp);
133	ap->a_bp->b_flags |= B_ERROR;
134	ap->a_bp->b_error = EOPNOTSUPP;
135	biodone(ap->a_bp);
136	return (EOPNOTSUPP);
137}
138
139int
140vop_stdpathconf(ap)
141	struct vop_pathconf_args /* {
142	struct vnode *a_vp;
143	int a_name;
144	int *a_retval;
145	} */ *ap;
146{
147
148	switch (ap->a_name) {
149		case _PC_LINK_MAX:
150			*ap->a_retval = LINK_MAX;
151			return (0);
152		case _PC_MAX_CANON:
153			*ap->a_retval = MAX_CANON;
154			return (0);
155		case _PC_MAX_INPUT:
156			*ap->a_retval = MAX_INPUT;
157			return (0);
158		case _PC_PIPE_BUF:
159			*ap->a_retval = PIPE_BUF;
160			return (0);
161		case _PC_CHOWN_RESTRICTED:
162			*ap->a_retval = 1;
163			return (0);
164		case _PC_VDISABLE:
165			*ap->a_retval = _POSIX_VDISABLE;
166			return (0);
167		default:
168			return (EINVAL);
169	}
170	/* NOTREACHED */
171}
172