vfs_default.c revision 30513 
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_islocked_desc,		(vop_t *) vop_noislocked },
67	{ &vop_lease_desc,		(vop_t *) lease_check },
68	{ &vop_lock_desc,		(vop_t *) vop_nolock },
69	{ &vop_mmap_desc,		(vop_t *) vop_einval },
70	{ &vop_open_desc,		(vop_t *) vop_null },
71	{ &vop_pathconf_desc,		(vop_t *) vop_einval },
72	{ &vop_poll_desc,		(vop_t *) vop_nopoll },
73	{ &vop_readlink_desc,		(vop_t *) vop_einval },
74	{ &vop_reallocblks_desc,	(vop_t *) vop_eopnotsupp },
75	{ &vop_revoke_desc,		(vop_t *) vop_revoke },
76	{ &vop_strategy_desc,		(vop_t *) vop_nostrategy },
77	{ &vop_unlock_desc,		(vop_t *) vop_nounlock },
78	{ NULL, NULL }
79};
80
81static struct vnodeopv_desc default_vnodeop_opv_desc =
82        { &default_vnodeop_p, default_vnodeop_entries };
83
84VNODEOP_SET(default_vnodeop_opv_desc);
85
86int
87vop_eopnotsupp(struct vop_generic_args *ap)
88{
89	/*
90	printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name);
91	*/
92
93	return (EOPNOTSUPP);
94}
95
96int
97vop_ebadf(struct vop_generic_args *ap)
98{
99
100	return (EBADF);
101}
102
103int
104vop_enotty(struct vop_generic_args *ap)
105{
106
107	return (ENOTTY);
108}
109
110int
111vop_einval(struct vop_generic_args *ap)
112{
113
114	return (EINVAL);
115}
116
117int
118vop_null(struct vop_generic_args *ap)
119{
120
121	return (0);
122}
123
124int
125vop_defaultop(struct vop_generic_args *ap)
126{
127
128	return (VOCALL(default_vnodeop_p, ap->a_desc->vdesc_offset, ap));
129}
130
131static int
132vop_nostrategy (struct vop_strategy_args *ap)
133{
134	printf("No strategy for buffer at %p\n", ap->a_bp);
135	vprint("", ap->a_bp->b_vp);
136	ap->a_bp->b_flags |= B_ERROR;
137	ap->a_bp->b_error = EOPNOTSUPP;
138	biodone(ap->a_bp);
139	return (EOPNOTSUPP);
140}
141
142int
143vop_stdpathconf(ap)
144	struct vop_pathconf_args /* {
145	struct vnode *a_vp;
146	int a_name;
147	int *a_retval;
148	} */ *ap;
149{
150
151	switch (ap->a_name) {
152		case _PC_LINK_MAX:
153			*ap->a_retval = LINK_MAX;
154			return (0);
155		case _PC_MAX_CANON:
156			*ap->a_retval = MAX_CANON;
157			return (0);
158		case _PC_MAX_INPUT:
159			*ap->a_retval = MAX_INPUT;
160			return (0);
161		case _PC_PIPE_BUF:
162			*ap->a_retval = PIPE_BUF;
163			return (0);
164		case _PC_CHOWN_RESTRICTED:
165			*ap->a_retval = 1;
166			return (0);
167		case _PC_VDISABLE:
168			*ap->a_retval = _POSIX_VDISABLE;
169			return (0);
170		default:
171			return (EINVAL);
172	}
173	/* NOTREACHED */
174}
175
176/*
177 * Standard lock, unlock and islocked functions.
178 *
179 * These depend on the lock structure being the first element in the
180 * inode, ie: vp->v_data points to the the lock!
181 */
182int
183vop_stdlock(ap)
184	struct vop_lock_args /* {
185		struct vnode *a_vp;
186		int a_flags;
187		struct proc *a_p;
188	} */ *ap;
189{
190	struct lock *l = (struct lock*)ap->a_vp->v_data;
191
192	return (lockmgr(l, ap->a_flags, &ap->a_vp->v_interlock, ap->a_p));
193}
194
195int
196vop_stdunlock(ap)
197	struct vop_unlock_args /* {
198		struct vnode *a_vp;
199		int a_flags;
200		struct proc *a_p;
201	} */ *ap;
202{
203	struct lock *l = (struct lock*)ap->a_vp->v_data;
204
205	return (lockmgr(l, ap->a_flags | LK_RELEASE, &ap->a_vp->v_interlock,
206	    ap->a_p));
207}
208
209int
210vop_stdislocked(ap)
211	struct vop_islocked_args /* {
212		struct vnode *a_vp;
213	} */ *ap;
214{
215	struct lock *l = (struct lock*)ap->a_vp->v_data;
216
217	return (lockstatus(l));
218}
219
220