[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 1.4 1993/11/25 01:32:42 wollman Exp $
 */

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

static int chkvnlock(struct vnode *);

/*
 * 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.
 */
static 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
fde1aeb2	34	* $Id: dead_vnops.c,v 1.4 1993/11/25 01:32:42 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
fde1aeb2 GW	45	static int chkvnlock(struct vnode *);
fde1aeb2 GW	46
15637ed4 RG	47	/*
	48	* Prototypes for dead operations on vnodes.
	49	*/
	50	int dead_badop(),
	51	dead_ebadf();
	52	int dead_lookup __P((
	53	struct vnode *vp,
	54	struct nameidata *ndp,
	55	struct proc *p));
	56	#define dead_create ((int (*) __P(( \
	57	struct nameidata *ndp, \
	58	struct vattr *vap, \
	59	struct proc *p))) dead_badop)
	60	#define dead_mknod ((int (*) __P(( \
	61	struct nameidata *ndp, \
	62	struct vattr *vap, \
	63	struct ucred *cred, \
	64	struct proc *p))) dead_badop)
	65	int dead_open __P((
	66	struct vnode *vp,
	67	int mode,
	68	struct ucred *cred,
	69	struct proc *p));
	70	#define dead_close ((int (*) __P(( \
	71	struct vnode *vp, \
	72	int fflag, \
	73	struct ucred *cred, \
	74	struct proc *p))) nullop)
	75	#define dead_access ((int (*) __P(( \
	76	struct vnode *vp, \
	77	int mode, \
	78	struct ucred *cred, \
	79	struct proc *p))) dead_ebadf)
	80	#define dead_getattr ((int (*) __P(( \
	81	struct vnode *vp, \
	82	struct vattr *vap, \
	83	struct ucred *cred, \
	84	struct proc *p))) dead_ebadf)
	85	#define dead_setattr ((int (*) __P(( \
	86	struct vnode *vp, \
	87	struct vattr *vap, \
	88	struct ucred *cred, \
	89	struct proc *p))) dead_ebadf)
	90	int dead_read __P((
	91	struct vnode *vp,
	92	struct uio *uio,
	93	int ioflag,
	94	struct ucred *cred));
	95	int dead_write __P((
	96	struct vnode *vp,
	97	struct uio *uio,
	98	int ioflag,
	99	struct ucred *cred));
	100	int dead_ioctl __P((
	101	struct vnode *vp,
	102	int command,
	103	caddr_t data,
	104	int fflag,
	105	struct ucred *cred,
	106	struct proc *p));
	107	int dead_select __P((
	108	struct vnode *vp,
	109	int which,
	110	int fflags,
111	struct ucred *cred,
112	struct proc *p));
113	#define dead_mmap ((int (*) __P(( \
114	struct vnode *vp, \
115	int fflags, \
116	struct ucred *cred, \
117	struct proc *p))) dead_badop)
118	#define dead_fsync ((int (*) __P(( \
119	struct vnode *vp, \
120	int fflags, \
121	struct ucred *cred, \
122	int waitfor, \
123	struct proc *p))) nullop)
124	#define dead_seek ((int (*) __P(( \
125	struct vnode *vp, \
126	off_t oldoff, \
127	off_t newoff, \
128	struct ucred *cred))) nullop)
129	#define dead_remove ((int (*) __P(( \
130	struct nameidata *ndp, \
131	struct proc *p))) dead_badop)
132	#define dead_link ((int (*) __P(( \
133	struct vnode *vp, \
134	struct nameidata *ndp, \
135	struct proc *p))) dead_badop)
136	#define dead_rename ((int (*) __P(( \
137	struct nameidata *fndp, \
138	struct nameidata *tdnp, \
139	struct proc *p))) dead_badop)
140	#define dead_mkdir ((int (*) __P(( \
141	struct nameidata *ndp, \
142	struct vattr *vap, \
143	struct proc *p))) dead_badop)
144	#define dead_rmdir ((int (*) __P(( \
145	struct nameidata *ndp, \
146	struct proc *p))) dead_badop)
147	#define dead_symlink ((int (*) __P(( \
148	struct nameidata *ndp, \
149	struct vattr *vap, \
150	char *target, \
151	struct proc *p))) dead_badop)
152	#define dead_readdir ((int (*) __P(( \
153	struct vnode *vp, \
154	struct uio *uio, \
155	struct ucred *cred, \
156	int *eofflagp))) dead_ebadf)
157	#define dead_readlink ((int (*) __P(( \
158	struct vnode *vp, \
159	struct uio *uio, \
160	struct ucred *cred))) dead_ebadf)
161	#define dead_abortop ((int (*) __P(( \
162	struct nameidata *ndp))) dead_badop)
163	#define dead_inactive ((int (*) __P(( \
164	struct vnode *vp, \
165	struct proc *p))) nullop)
166	#define dead_reclaim ((int (*) __P(( \
167	struct vnode *vp))) nullop)
168	int dead_lock __P((
169	struct vnode *vp));
170	#define dead_unlock ((int (*) __P(( \
171	struct vnode *vp))) nullop)
172	int dead_bmap __P((
173	struct vnode *vp,
174	daddr_t bn,
175	struct vnode **vpp,
176	daddr_t *bnp));
177	int dead_strategy __P((
178	struct buf *bp));
4c45483e	179	void dead_print __P((
15637ed4 RG	180	struct vnode *vp));
	181	#define dead_islocked ((int (*) __P(( \
	182	struct vnode *vp))) nullop)
	183	#define dead_advlock ((int (*) __P(( \
	184	struct vnode *vp, \
	185	caddr_t id, \
	186	int op, \
	187	struct flock *fl, \
	188	int flags))) dead_ebadf)
	189
	190	struct vnodeops dead_vnodeops = {
	191	dead_lookup, /* lookup */
	192	dead_create, /* create */
	193	dead_mknod, /* mknod */
	194	dead_open, /* open */
	195	dead_close, /* close */
	196	dead_access, /* access */
	197	dead_getattr, /* getattr */
	198	dead_setattr, /* setattr */
	199	dead_read, /* read */
	200	dead_write, /* write */
	201	dead_ioctl, /* ioctl */
	202	dead_select, /* select */
	203	dead_mmap, /* mmap */
	204	dead_fsync, /* fsync */
	205	dead_seek, /* seek */
	206	dead_remove, /* remove */
	207	dead_link, /* link */
	208	dead_rename, /* rename */
	209	dead_mkdir, /* mkdir */
	210	dead_rmdir, /* rmdir */
	211	dead_symlink, /* symlink */
	212	dead_readdir, /* readdir */
	213	dead_readlink, /* readlink */
	214	dead_abortop, /* abortop */
	215	dead_inactive, /* inactive */
	216	dead_reclaim, /* reclaim */
	217	dead_lock, /* lock */
	218	dead_unlock, /* unlock */
	219	dead_bmap, /* bmap */
	220	dead_strategy, /* strategy */
	221	dead_print, /* print */
	222	dead_islocked, /* islocked */
	223	dead_advlock, /* advlock */
	224	};
	225
	226	/*
	227	* Trivial lookup routine that always fails.
	228	*/
	229	/* ARGSUSED */
4c45483e	230	int
15637ed4 RG	231	dead_lookup(vp, ndp, p)
	232	struct vnode *vp;
	233	struct nameidata *ndp;
	234	struct proc *p;
	235	{
	236
	237	ndp->ni_dvp = vp;
	238	ndp->ni_vp = NULL;
	239	return (ENOTDIR);
	240	}
	241
	242	/*
	243	* Open always fails as if device did not exist.
	244	*/
	245	/* ARGSUSED */
4c45483e	246	int
15637ed4 RG	247	dead_open(vp, mode, cred, p)
	248	struct vnode *vp;
	249	int mode;
	250	struct ucred *cred;
	251	struct proc *p;
	252	{
	253
	254	return (ENXIO);
	255	}
	256
	257	/*
	258	* Vnode op for read
	259	*/
	260	/* ARGSUSED */
4c45483e	261	int
15637ed4 RG	262	dead_read(vp, uio, ioflag, cred)
	263	struct vnode *vp;
	264	struct uio *uio;
	265	int ioflag;
	266	struct ucred *cred;
	267	{
	268
	269	if (chkvnlock(vp))
	270	panic("dead_read: lock");
	271	/*
	272	* Return EOF for character devices, EIO for others
	273	*/
	274	if (vp->v_type != VCHR)
	275	return (EIO);
	276	return (0);
	277	}
	278
	279	/*
	280	* Vnode op for write
	281	*/
	282	/* ARGSUSED */
4c45483e	283	int
15637ed4 RG	284	dead_write(vp, uio, ioflag, cred)
	285	register struct vnode *vp;
	286	struct uio *uio;
	287	int ioflag;
	288	struct ucred *cred;
	289	{
	290
	291	if (chkvnlock(vp))
	292	panic("dead_write: lock");
	293	return (EIO);
	294	}
	295
	296	/*
	297	* Device ioctl operation.
	298	*/
	299	/* ARGSUSED */
4c45483e	300	int
15637ed4 RG	301	dead_ioctl(vp, com, data, fflag, cred, p)
	302	struct vnode *vp;
	303	register int com;
	304	caddr_t data;
	305	int fflag;
	306	struct ucred *cred;
	307	struct proc *p;
	308	{
	309
	310	if (!chkvnlock(vp))
	311	return (EBADF);
	312	return (VOP_IOCTL(vp, com, data, fflag, cred, p));
	313	}
	314
	315	/* ARGSUSED */
4c45483e	316	int
15637ed4 RG	317	dead_select(vp, which, fflags, cred, p)
	318	struct vnode *vp;
	319	int which, fflags;
	320	struct ucred *cred;
	321	struct proc *p;
	322	{
	323
	324	/*
	325	* Let the user find out that the descriptor is gone.
	326	*/
	327	return (1);
	328	}
	329
	330	/*
	331	* Just call the device strategy routine
	332	*/
4c45483e	333	int
15637ed4 RG	334	dead_strategy(bp)
	335	register struct buf *bp;
	336	{
	337
	338	if (bp->b_vp == NULL \|\| !chkvnlock(bp->b_vp)) {
	339	bp->b_flags \|= B_ERROR;
	340	biodone(bp);
	341	return (EIO);
	342	}
	343	return (VOP_STRATEGY(bp));
	344	}
	345
	346	/*
	347	* Wait until the vnode has finished changing state.
	348	*/
4c45483e	349	int
15637ed4 RG	350	dead_lock(vp)
	351	struct vnode *vp;
	352	{
	353
	354	if (!chkvnlock(vp))
	355	return (0);
	356	return (VOP_LOCK(vp));
	357	}
	358
	359	/*
	360	* Wait until the vnode has finished changing state.
	361	*/
4c45483e	362	int
15637ed4 RG	363	dead_bmap(vp, bn, vpp, bnp)
	364	struct vnode *vp;
	365	daddr_t bn;
	366	struct vnode **vpp;
	367	daddr_t *bnp;
	368	{
	369
	370	if (!chkvnlock(vp))
	371	return (EIO);
	372	return (VOP_BMAP(vp, bn, vpp, bnp));
	373	}
	374
	375	/*
	376	* Print out the contents of a dead vnode.
	377	*/
	378	/* ARGSUSED */
4c45483e	379	void
15637ed4 RG	380	dead_print(vp)
	381	struct vnode *vp;
	382	{
	383
	384	printf("tag VT_NON, dead vnode\n");
	385	}
	386
	387	/*
	388	* Empty vnode failed operation
	389	*/
4c45483e	390	int
15637ed4 RG	391	dead_ebadf()
	392	{
	393
	394	return (EBADF);
	395	}
	396
	397	/*
	398	* Empty vnode bad operation
	399	*/
4c45483e	400	int
15637ed4 RG	401	dead_badop()
	402	{
	403
	404	panic("dead_badop called");
	405	/* NOTREACHED */
	406	}
	407
	408	/*
	409	* Empty vnode null operation
	410	*/
4c45483e	411	int
15637ed4 RG	412	dead_nullop()
	413	{
	414
	415	return (0);
	416	}
	417
	418	/*
	419	* We have to wait during times when the vnode is
	420	* in a state of change.
	421	*/
fde1aeb2	422	static int
15637ed4 RG	423	chkvnlock(vp)
	424	register struct vnode *vp;
	425	{
	426	int locked = 0;
	427
	428	while (vp->v_flag & VXLOCK) {
	429	vp->v_flag \|= VXWANT;
73419b27	430	tsleep((caddr_t)vp, PINOD, "chkvnlk", 0);
15637ed4 RG	431	locked = 1;
	432	}
	433	return (locked);
	434	}