[unix-history] / sys / kern / dead_vnops.c

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)dead_vnops.c	7.13 (Berkeley) 4/15/91
 *	$Id: dead_vnops.c,v 1.3 1993/11/07 21:44:40 wollman Exp $
 */

#include "param.h"
#include "systm.h"
#include "time.h"
#include "vnode.h"
#include "errno.h"
#include "namei.h"
#include "buf.h"

/*
 * Prototypes for dead operations on vnodes.
 */
int	dead_badop(),
	dead_ebadf();
int	dead_lookup __P((
		struct vnode *vp,
		struct nameidata *ndp,
		struct proc *p));
#define dead_create ((int (*) __P(( \
		struct nameidata *ndp, \
		struct vattr *vap, \
		struct proc *p))) dead_badop)
#define dead_mknod ((int (*) __P(( \
		struct nameidata *ndp, \
		struct vattr *vap, \
		struct ucred *cred, \
		struct proc *p))) dead_badop)
int	dead_open __P((
		struct vnode *vp,
		int mode,
		struct ucred *cred,
		struct proc *p));
#define dead_close ((int (*) __P(( \
		struct vnode *vp, \
		int fflag, \
		struct ucred *cred, \
		struct proc *p))) nullop)
#define dead_access ((int (*) __P(( \
		struct vnode *vp, \
		int mode, \
		struct ucred *cred, \
		struct proc *p))) dead_ebadf)
#define dead_getattr ((int (*) __P(( \
		struct vnode *vp, \
		struct vattr *vap, \
		struct ucred *cred, \
		struct proc *p))) dead_ebadf)
#define dead_setattr ((int (*) __P(( \
		struct vnode *vp, \
		struct vattr *vap, \
		struct ucred *cred, \
		struct proc *p))) dead_ebadf)
int	dead_read __P((
		struct vnode *vp,
		struct uio *uio,
		int ioflag,
		struct ucred *cred));
int	dead_write __P((
		struct vnode *vp,
		struct uio *uio,
		int ioflag,
		struct ucred *cred));
int	dead_ioctl __P((
		struct vnode *vp,
		int command,
		caddr_t data,
		int fflag,
		struct ucred *cred,
		struct proc *p));
int	dead_select __P((
		struct vnode *vp,
		int which,
		int fflags,
		struct ucred *cred,
		struct proc *p));
#define dead_mmap ((int (*) __P(( \
		struct vnode *vp, \
		int fflags, \
		struct ucred *cred, \
		struct proc *p))) dead_badop)
#define dead_fsync ((int (*) __P(( \
		struct vnode *vp, \
		int fflags, \
		struct ucred *cred, \
		int waitfor, \
		struct proc *p))) nullop)
#define dead_seek ((int (*) __P(( \
		struct vnode *vp, \
		off_t oldoff, \
		off_t newoff, \
		struct ucred *cred))) nullop)
#define dead_remove ((int (*) __P(( \
		struct nameidata *ndp, \
		struct proc *p))) dead_badop)
#define dead_link ((int (*) __P(( \
		struct vnode *vp, \
		struct nameidata *ndp, \
		struct proc *p))) dead_badop)
#define dead_rename ((int (*) __P(( \
		struct nameidata *fndp, \
		struct nameidata *tdnp, \
		struct proc *p))) dead_badop)
#define dead_mkdir ((int (*) __P(( \
		struct nameidata *ndp, \
		struct vattr *vap, \
		struct proc *p))) dead_badop)
#define dead_rmdir ((int (*) __P(( \
		struct nameidata *ndp, \
		struct proc *p))) dead_badop)
#define dead_symlink ((int (*) __P(( \
		struct nameidata *ndp, \
		struct vattr *vap, \
		char *target, \
		struct proc *p))) dead_badop)
#define dead_readdir ((int (*) __P(( \
		struct vnode *vp, \
		struct uio *uio, \
		struct ucred *cred, \
		int *eofflagp))) dead_ebadf)
#define dead_readlink ((int (*) __P(( \
		struct vnode *vp, \
		struct uio *uio, \
		struct ucred *cred))) dead_ebadf)
#define dead_abortop ((int (*) __P(( \
		struct nameidata *ndp))) dead_badop)
#define dead_inactive ((int (*) __P(( \
		struct vnode *vp, \
		struct proc *p))) nullop)
#define dead_reclaim ((int (*) __P(( \
		struct vnode *vp))) nullop)
int	dead_lock __P((
		struct vnode *vp));
#define dead_unlock ((int (*) __P(( \
		struct vnode *vp))) nullop)
int	dead_bmap __P((
		struct vnode *vp,
		daddr_t bn,
		struct vnode **vpp,
		daddr_t *bnp));
int	dead_strategy __P((
		struct buf *bp));
void	dead_print __P((
		struct vnode *vp));
#define dead_islocked ((int (*) __P(( \
		struct vnode *vp))) nullop)
#define dead_advlock ((int (*) __P(( \
		struct vnode *vp, \
		caddr_t id, \
		int op, \
		struct flock *fl, \
		int flags))) dead_ebadf)

struct vnodeops dead_vnodeops = {
	dead_lookup,	/* lookup */
	dead_create,	/* create */
	dead_mknod,	/* mknod */
	dead_open,	/* open */
	dead_close,	/* close */
	dead_access,	/* access */
	dead_getattr,	/* getattr */
	dead_setattr,	/* setattr */
	dead_read,	/* read */
	dead_write,	/* write */
	dead_ioctl,	/* ioctl */
	dead_select,	/* select */
	dead_mmap,	/* mmap */
	dead_fsync,	/* fsync */
	dead_seek,	/* seek */
	dead_remove,	/* remove */
	dead_link,	/* link */
	dead_rename,	/* rename */
	dead_mkdir,	/* mkdir */
	dead_rmdir,	/* rmdir */
	dead_symlink,	/* symlink */
	dead_readdir,	/* readdir */
	dead_readlink,	/* readlink */
	dead_abortop,	/* abortop */
	dead_inactive,	/* inactive */
	dead_reclaim,	/* reclaim */
	dead_lock,	/* lock */
	dead_unlock,	/* unlock */
	dead_bmap,	/* bmap */
	dead_strategy,	/* strategy */
	dead_print,	/* print */
	dead_islocked,	/* islocked */
	dead_advlock,	/* advlock */
};

/*
 * Trivial lookup routine that always fails.
 */
/* ARGSUSED */
int
dead_lookup(vp, ndp, p)
	struct vnode *vp;
	struct nameidata *ndp;
	struct proc *p;
{

	ndp->ni_dvp = vp;
	ndp->ni_vp = NULL;
	return (ENOTDIR);
}

/*
 * Open always fails as if device did not exist.
 */
/* ARGSUSED */
int
dead_open(vp, mode, cred, p)
	struct vnode *vp;
	int mode;
	struct ucred *cred;
	struct proc *p;
{

	return (ENXIO);
}

/*
 * Vnode op for read
 */
/* ARGSUSED */
int
dead_read(vp, uio, ioflag, cred)
	struct vnode *vp;
	struct uio *uio;
	int ioflag;
	struct ucred *cred;
{

	if (chkvnlock(vp))
		panic("dead_read: lock");
	/*
	 * Return EOF for character devices, EIO for others
	 */
	if (vp->v_type != VCHR)
		return (EIO);
	return (0);
}

/*
 * Vnode op for write
 */
/* ARGSUSED */
int
dead_write(vp, uio, ioflag, cred)
	register struct vnode *vp;
	struct uio *uio;
	int ioflag;
	struct ucred *cred;
{

	if (chkvnlock(vp))
		panic("dead_write: lock");
	return (EIO);
}

/*
 * Device ioctl operation.
 */
/* ARGSUSED */
int
dead_ioctl(vp, com, data, fflag, cred, p)
	struct vnode *vp;
	register int com;
	caddr_t data;
	int fflag;
	struct ucred *cred;
	struct proc *p;
{

	if (!chkvnlock(vp))
		return (EBADF);
	return (VOP_IOCTL(vp, com, data, fflag, cred, p));
}

/* ARGSUSED */
int
dead_select(vp, which, fflags, cred, p)
	struct vnode *vp;
	int which, fflags;
	struct ucred *cred;
	struct proc *p;
{

	/*
	 * Let the user find out that the descriptor is gone.
	 */
	return (1);
}

/*
 * Just call the device strategy routine
 */
int
dead_strategy(bp)
	register struct buf *bp;
{

	if (bp->b_vp == NULL || !chkvnlock(bp->b_vp)) {
		bp->b_flags |= B_ERROR;
		biodone(bp);
		return (EIO);
	}
	return (VOP_STRATEGY(bp));
}

/*
 * Wait until the vnode has finished changing state.
 */
int
dead_lock(vp)
	struct vnode *vp;
{

	if (!chkvnlock(vp))
		return (0);
	return (VOP_LOCK(vp));
}

/*
 * Wait until the vnode has finished changing state.
 */
int
dead_bmap(vp, bn, vpp, bnp)
	struct vnode *vp;
	daddr_t bn;
	struct vnode **vpp;
	daddr_t *bnp;
{

	if (!chkvnlock(vp))
		return (EIO);
	return (VOP_BMAP(vp, bn, vpp, bnp));
}

/*
 * Print out the contents of a dead vnode.
 */
/* ARGSUSED */
void
dead_print(vp)
	struct vnode *vp;
{

	printf("tag VT_NON, dead vnode\n");
}

/*
 * Empty vnode failed operation
 */
int
dead_ebadf()
{

	return (EBADF);
}

/*
 * Empty vnode bad operation
 */
int
dead_badop()
{

	panic("dead_badop called");
	/* NOTREACHED */
}

/*
 * Empty vnode null operation
 */
int
dead_nullop()
{

	return (0);
}

/*
 * We have to wait during times when the vnode is
 * in a state of change.
 */
int
chkvnlock(vp)
	register struct vnode *vp;
{
	int locked = 0;

	while (vp->v_flag & VXLOCK) {
		vp->v_flag |= VXWANT;
		tsleep((caddr_t)vp, PINOD, "chkvnlk", 0);
		locked = 1;
	}
	return (locked);
}
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1989 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*
600f7f07	33	* from: @(#)dead_vnops.c 7.13 (Berkeley) 4/15/91
4c45483e	34	* $Id: dead_vnops.c,v 1.3 1993/11/07 21:44:40 wollman Exp $
15637ed4 RG	35	*/
	36
	37	#include "param.h"
	38	#include "systm.h"
	39	#include "time.h"
	40	#include "vnode.h"
	41	#include "errno.h"
	42	#include "namei.h"
	43	#include "buf.h"
	44
	45	/*
	46	* Prototypes for dead operations on vnodes.
	47	*/
	48	int dead_badop(),
	49	dead_ebadf();
	50	int dead_lookup __P((
	51	struct vnode *vp,
	52	struct nameidata *ndp,
	53	struct proc *p));
	54	#define dead_create ((int (*) __P(( \
	55	struct nameidata *ndp, \
	56	struct vattr *vap, \
	57	struct proc *p))) dead_badop)
	58	#define dead_mknod ((int (*) __P(( \
	59	struct nameidata *ndp, \
	60	struct vattr *vap, \
	61	struct ucred *cred, \
	62	struct proc *p))) dead_badop)
	63	int dead_open __P((
	64	struct vnode *vp,
	65	int mode,
	66	struct ucred *cred,
	67	struct proc *p));
	68	#define dead_close ((int (*) __P(( \
	69	struct vnode *vp, \
	70	int fflag, \
	71	struct ucred *cred, \
	72	struct proc *p))) nullop)
	73	#define dead_access ((int (*) __P(( \
	74	struct vnode *vp, \
	75	int mode, \
	76	struct ucred *cred, \
	77	struct proc *p))) dead_ebadf)
	78	#define dead_getattr ((int (*) __P(( \
	79	struct vnode *vp, \
	80	struct vattr *vap, \
	81	struct ucred *cred, \
	82	struct proc *p))) dead_ebadf)
	83	#define dead_setattr ((int (*) __P(( \
	84	struct vnode *vp, \
	85	struct vattr *vap, \
	86	struct ucred *cred, \
	87	struct proc *p))) dead_ebadf)
	88	int dead_read __P((
	89	struct vnode *vp,
	90	struct uio *uio,
	91	int ioflag,
	92	struct ucred *cred));
	93	int dead_write __P((
	94	struct vnode *vp,
	95	struct uio *uio,
	96	int ioflag,
	97	struct ucred *cred));
	98	int dead_ioctl __P((
99	struct vnode *vp,
100	int command,
101	caddr_t data,
102	int fflag,
103	struct ucred *cred,
104	struct proc *p));
105	int dead_select __P((
106	struct vnode *vp,
107	int which,
108	int fflags,
109	struct ucred *cred,
110	struct proc *p));
111	#define dead_mmap ((int (*) __P(( \
112	struct vnode *vp, \
113	int fflags, \
114	struct ucred *cred, \
115	struct proc *p))) dead_badop)
116	#define dead_fsync ((int (*) __P(( \
117	struct vnode *vp, \
118	int fflags, \
119	struct ucred *cred, \
120	int waitfor, \
121	struct proc *p))) nullop)
122	#define dead_seek ((int (*) __P(( \
123	struct vnode *vp, \
124	off_t oldoff, \
125	off_t newoff, \
126	struct ucred *cred))) nullop)
127	#define dead_remove ((int (*) __P(( \
128	struct nameidata *ndp, \
129	struct proc *p))) dead_badop)
130	#define dead_link ((int (*) __P(( \
131	struct vnode *vp, \
132	struct nameidata *ndp, \
133	struct proc *p))) dead_badop)
134	#define dead_rename ((int (*) __P(( \
135	struct nameidata *fndp, \
136	struct nameidata *tdnp, \
137	struct proc *p))) dead_badop)
138	#define dead_mkdir ((int (*) __P(( \
139	struct nameidata *ndp, \
140	struct vattr *vap, \
141	struct proc *p))) dead_badop)
142	#define dead_rmdir ((int (*) __P(( \
143	struct nameidata *ndp, \
144	struct proc *p))) dead_badop)
145	#define dead_symlink ((int (*) __P(( \
146	struct nameidata *ndp, \
147	struct vattr *vap, \
148	char *target, \
149	struct proc *p))) dead_badop)
150	#define dead_readdir ((int (*) __P(( \
151	struct vnode *vp, \
152	struct uio *uio, \
153	struct ucred *cred, \
154	int *eofflagp))) dead_ebadf)
155	#define dead_readlink ((int (*) __P(( \
156	struct vnode *vp, \
157	struct uio *uio, \
158	struct ucred *cred))) dead_ebadf)
159	#define dead_abortop ((int (*) __P(( \
160	struct nameidata *ndp))) dead_badop)
161	#define dead_inactive ((int (*) __P(( \
162	struct vnode *vp, \
163	struct proc *p))) nullop)
164	#define dead_reclaim ((int (*) __P(( \
165	struct vnode *vp))) nullop)
166	int dead_lock __P((
167	struct vnode *vp));
168	#define dead_unlock ((int (*) __P(( \
169	struct vnode *vp))) nullop)
170	int dead_bmap __P((
171	struct vnode *vp,
172	daddr_t bn,
173	struct vnode **vpp,
174	daddr_t *bnp));
175	int dead_strategy __P((
176	struct buf *bp));
4c45483e	177	void dead_print __P((
15637ed4 RG	178	struct vnode *vp));
	179	#define dead_islocked ((int (*) __P(( \
	180	struct vnode *vp))) nullop)
	181	#define dead_advlock ((int (*) __P(( \
	182	struct vnode *vp, \
	183	caddr_t id, \
	184	int op, \
	185	struct flock *fl, \
	186	int flags))) dead_ebadf)
	187
	188	struct vnodeops dead_vnodeops = {
	189	dead_lookup, /* lookup */
	190	dead_create, /* create */
	191	dead_mknod, /* mknod */
	192	dead_open, /* open */
	193	dead_close, /* close */
	194	dead_access, /* access */
	195	dead_getattr, /* getattr */
	196	dead_setattr, /* setattr */
	197	dead_read, /* read */
	198	dead_write, /* write */
	199	dead_ioctl, /* ioctl */
	200	dead_select, /* select */
	201	dead_mmap, /* mmap */
	202	dead_fsync, /* fsync */
	203	dead_seek, /* seek */
	204	dead_remove, /* remove */
	205	dead_link, /* link */
	206	dead_rename, /* rename */
	207	dead_mkdir, /* mkdir */
	208	dead_rmdir, /* rmdir */
	209	dead_symlink, /* symlink */
	210	dead_readdir, /* readdir */
	211	dead_readlink, /* readlink */
	212	dead_abortop, /* abortop */
	213	dead_inactive, /* inactive */
	214	dead_reclaim, /* reclaim */
	215	dead_lock, /* lock */
	216	dead_unlock, /* unlock */
	217	dead_bmap, /* bmap */
	218	dead_strategy, /* strategy */
	219	dead_print, /* print */
	220	dead_islocked, /* islocked */
	221	dead_advlock, /* advlock */
	222	};
	223
	224	/*
	225	* Trivial lookup routine that always fails.
	226	*/
	227	/* ARGSUSED */
4c45483e	228	int
15637ed4 RG	229	dead_lookup(vp, ndp, p)
	230	struct vnode *vp;
	231	struct nameidata *ndp;
	232	struct proc *p;
	233	{
	234
	235	ndp->ni_dvp = vp;
	236	ndp->ni_vp = NULL;
	237	return (ENOTDIR);
	238	}
	239
	240	/*
	241	* Open always fails as if device did not exist.
	242	*/
	243	/* ARGSUSED */
4c45483e	244	int
15637ed4 RG	245	dead_open(vp, mode, cred, p)
	246	struct vnode *vp;
	247	int mode;
	248	struct ucred *cred;
	249	struct proc *p;
	250	{
	251
	252	return (ENXIO);
	253	}
	254
	255	/*
	256	* Vnode op for read
	257	*/
	258	/* ARGSUSED */
4c45483e	259	int
15637ed4 RG	260	dead_read(vp, uio, ioflag, cred)
	261	struct vnode *vp;
	262	struct uio *uio;
	263	int ioflag;
	264	struct ucred *cred;
	265	{
	266
	267	if (chkvnlock(vp))
	268	panic("dead_read: lock");
	269	/*
	270	* Return EOF for character devices, EIO for others
	271	*/
	272	if (vp->v_type != VCHR)
	273	return (EIO);
	274	return (0);
	275	}
	276
	277	/*
	278	* Vnode op for write
	279	*/
	280	/* ARGSUSED */
4c45483e	281	int
15637ed4 RG	282	dead_write(vp, uio, ioflag, cred)
	283	register struct vnode *vp;
	284	struct uio *uio;
	285	int ioflag;
	286	struct ucred *cred;
	287	{
	288
	289	if (chkvnlock(vp))
	290	panic("dead_write: lock");
	291	return (EIO);
	292	}
	293
	294	/*
	295	* Device ioctl operation.
	296	*/
	297	/* ARGSUSED */
4c45483e	298	int
15637ed4 RG	299	dead_ioctl(vp, com, data, fflag, cred, p)
	300	struct vnode *vp;
	301	register int com;
	302	caddr_t data;
	303	int fflag;
	304	struct ucred *cred;
	305	struct proc *p;
	306	{
	307
	308	if (!chkvnlock(vp))
	309	return (EBADF);
	310	return (VOP_IOCTL(vp, com, data, fflag, cred, p));
	311	}
	312
	313	/* ARGSUSED */
4c45483e	314	int
15637ed4 RG	315	dead_select(vp, which, fflags, cred, p)
	316	struct vnode *vp;
	317	int which, fflags;
	318	struct ucred *cred;
	319	struct proc *p;
	320	{
	321
	322	/*
	323	* Let the user find out that the descriptor is gone.
	324	*/
	325	return (1);
	326	}
	327
	328	/*
	329	* Just call the device strategy routine
	330	*/
4c45483e	331	int
15637ed4 RG	332	dead_strategy(bp)
	333	register struct buf *bp;
	334	{
	335
	336	if (bp->b_vp == NULL \|\| !chkvnlock(bp->b_vp)) {
	337	bp->b_flags \|= B_ERROR;
	338	biodone(bp);
	339	return (EIO);
	340	}
	341	return (VOP_STRATEGY(bp));
	342	}
	343
	344	/*
	345	* Wait until the vnode has finished changing state.
	346	*/
4c45483e	347	int
15637ed4 RG	348	dead_lock(vp)
	349	struct vnode *vp;
	350	{
	351
	352	if (!chkvnlock(vp))
	353	return (0);
	354	return (VOP_LOCK(vp));
	355	}
	356
	357	/*
	358	* Wait until the vnode has finished changing state.
	359	*/
4c45483e	360	int
15637ed4 RG	361	dead_bmap(vp, bn, vpp, bnp)
	362	struct vnode *vp;
	363	daddr_t bn;
	364	struct vnode **vpp;
	365	daddr_t *bnp;
	366	{
	367
	368	if (!chkvnlock(vp))
	369	return (EIO);
	370	return (VOP_BMAP(vp, bn, vpp, bnp));
	371	}
	372
	373	/*
	374	* Print out the contents of a dead vnode.
	375	*/
	376	/* ARGSUSED */
4c45483e	377	void
15637ed4 RG	378	dead_print(vp)
	379	struct vnode *vp;
	380	{
	381
	382	printf("tag VT_NON, dead vnode\n");
	383	}
	384
	385	/*
	386	* Empty vnode failed operation
	387	*/
4c45483e	388	int
15637ed4 RG	389	dead_ebadf()
	390	{
	391
	392	return (EBADF);
	393	}
	394
	395	/*
	396	* Empty vnode bad operation
	397	*/
4c45483e	398	int
15637ed4 RG	399	dead_badop()
	400	{
	401
	402	panic("dead_badop called");
	403	/* NOTREACHED */
	404	}
	405
	406	/*
	407	* Empty vnode null operation
	408	*/
4c45483e	409	int
15637ed4 RG	410	dead_nullop()
	411	{
	412
	413	return (0);
	414	}
	415
	416	/*
	417	* We have to wait during times when the vnode is
	418	* in a state of change.
	419	*/
4c45483e	420	int
15637ed4 RG	421	chkvnlock(vp)
	422	register struct vnode *vp;
	423	{
	424	int locked = 0;
	425
	426	while (vp->v_flag & VXLOCK) {
	427	vp->v_flag \|= VXWANT;
73419b27	428	tsleep((caddr_t)vp, PINOD, "chkvnlk", 0);
15637ed4 RG	429	locked = 1;
	430	}
	431	return (locked);
	432	}