435 lines
9.2 KiB
C
435 lines
9.2 KiB
C
/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)dead_vnops.c 7.13 (Berkeley) 4/15/91
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* $Id: dead_vnops.c,v 1.4 1993/08/01 19:25:58 mycroft Exp $
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*/
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#include "param.h"
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#include "systm.h"
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#include "time.h"
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#include "vnode.h"
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#include "errno.h"
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#include "namei.h"
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#include "buf.h"
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/*
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* Prototypes for dead operations on vnodes.
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*/
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volatile void dead_badop();
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int dead_ebadf();
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int dead_lookup __P((
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struct vnode *vp,
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struct nameidata *ndp,
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struct proc *p));
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#define dead_create ((int (*) __P(( \
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struct nameidata *ndp, \
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struct vattr *vap, \
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struct proc *p))) dead_badop)
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#define dead_mknod ((int (*) __P(( \
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struct nameidata *ndp, \
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struct vattr *vap, \
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struct ucred *cred, \
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struct proc *p))) dead_badop)
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int dead_open __P((
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struct vnode *vp,
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int mode,
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struct ucred *cred,
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struct proc *p));
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#define dead_close ((int (*) __P(( \
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struct vnode *vp, \
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int fflag, \
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struct ucred *cred, \
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struct proc *p))) nullop)
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#define dead_access ((int (*) __P(( \
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struct vnode *vp, \
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int mode, \
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struct ucred *cred, \
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struct proc *p))) dead_ebadf)
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#define dead_getattr ((int (*) __P(( \
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struct vnode *vp, \
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struct vattr *vap, \
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struct ucred *cred, \
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struct proc *p))) dead_ebadf)
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#define dead_setattr ((int (*) __P(( \
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struct vnode *vp, \
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struct vattr *vap, \
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struct ucred *cred, \
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struct proc *p))) dead_ebadf)
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int dead_read __P((
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struct vnode *vp,
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struct uio *uio,
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int ioflag,
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struct ucred *cred));
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int dead_write __P((
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struct vnode *vp,
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struct uio *uio,
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int ioflag,
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struct ucred *cred));
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int dead_ioctl __P((
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struct vnode *vp,
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int command,
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caddr_t data,
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int fflag,
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struct ucred *cred,
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struct proc *p));
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int dead_select __P((
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struct vnode *vp,
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int which,
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int fflags,
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struct ucred *cred,
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struct proc *p));
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#define dead_mmap ((int (*) __P(( \
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struct vnode *vp, \
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int fflags, \
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struct ucred *cred, \
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struct proc *p))) dead_badop)
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#define dead_fsync ((int (*) __P(( \
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struct vnode *vp, \
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int fflags, \
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struct ucred *cred, \
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int waitfor, \
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struct proc *p))) nullop)
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#define dead_seek ((int (*) __P(( \
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struct vnode *vp, \
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off_t oldoff, \
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off_t newoff, \
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struct ucred *cred))) nullop)
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#define dead_remove ((int (*) __P(( \
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struct nameidata *ndp, \
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struct proc *p))) dead_badop)
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#define dead_link ((int (*) __P(( \
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struct vnode *vp, \
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struct nameidata *ndp, \
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struct proc *p))) dead_badop)
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#define dead_rename ((int (*) __P(( \
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struct nameidata *fndp, \
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struct nameidata *tdnp, \
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struct proc *p))) dead_badop)
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#define dead_mkdir ((int (*) __P(( \
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struct nameidata *ndp, \
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struct vattr *vap, \
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struct proc *p))) dead_badop)
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#define dead_rmdir ((int (*) __P(( \
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struct nameidata *ndp, \
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struct proc *p))) dead_badop)
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#define dead_symlink ((int (*) __P(( \
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struct nameidata *ndp, \
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struct vattr *vap, \
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char *target, \
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struct proc *p))) dead_badop)
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#define dead_readdir ((int (*) __P(( \
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struct vnode *vp, \
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struct uio *uio, \
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struct ucred *cred, \
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int *eofflagp))) dead_ebadf)
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#define dead_readlink ((int (*) __P(( \
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struct vnode *vp, \
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struct uio *uio, \
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struct ucred *cred))) dead_ebadf)
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#define dead_abortop ((int (*) __P(( \
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struct nameidata *ndp))) dead_badop)
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#define dead_inactive ((int (*) __P(( \
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struct vnode *vp, \
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struct proc *p))) nullop)
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#define dead_reclaim ((int (*) __P(( \
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struct vnode *vp))) nullop)
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int dead_lock __P((
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struct vnode *vp));
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#define dead_unlock ((int (*) __P(( \
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struct vnode *vp))) nullop)
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int dead_bmap __P((
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struct vnode *vp,
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daddr_t bn,
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struct vnode **vpp,
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daddr_t *bnp));
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int dead_strategy __P((
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struct buf *bp));
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void dead_print __P((
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struct vnode *vp));
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#define dead_islocked ((int (*) __P(( \
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struct vnode *vp))) nullop)
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#define dead_advlock ((int (*) __P(( \
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struct vnode *vp, \
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caddr_t id, \
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int op, \
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struct flock *fl, \
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int flags))) dead_ebadf)
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int chkvnlock __P((
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struct vnode *vp));
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struct vnodeops dead_vnodeops = {
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dead_lookup, /* lookup */
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dead_create, /* create */
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dead_mknod, /* mknod */
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dead_open, /* open */
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dead_close, /* close */
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dead_access, /* access */
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dead_getattr, /* getattr */
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dead_setattr, /* setattr */
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dead_read, /* read */
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dead_write, /* write */
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dead_ioctl, /* ioctl */
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dead_select, /* select */
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dead_mmap, /* mmap */
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dead_fsync, /* fsync */
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dead_seek, /* seek */
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dead_remove, /* remove */
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dead_link, /* link */
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dead_rename, /* rename */
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dead_mkdir, /* mkdir */
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dead_rmdir, /* rmdir */
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dead_symlink, /* symlink */
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dead_readdir, /* readdir */
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dead_readlink, /* readlink */
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dead_abortop, /* abortop */
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dead_inactive, /* inactive */
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dead_reclaim, /* reclaim */
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dead_lock, /* lock */
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dead_unlock, /* unlock */
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dead_bmap, /* bmap */
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dead_strategy, /* strategy */
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dead_print, /* print */
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dead_islocked, /* islocked */
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dead_advlock, /* advlock */
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};
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/*
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* Trivial lookup routine that always fails.
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*/
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/* ARGSUSED */
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int
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dead_lookup(vp, ndp, p)
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struct vnode *vp;
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struct nameidata *ndp;
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struct proc *p;
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{
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ndp->ni_dvp = vp;
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ndp->ni_vp = NULL;
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return (ENOTDIR);
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}
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/*
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* Open always fails as if device did not exist.
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*/
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/* ARGSUSED */
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int
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dead_open(vp, mode, cred, p)
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struct vnode *vp;
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int mode;
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struct ucred *cred;
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struct proc *p;
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{
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return (ENXIO);
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}
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/*
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* Vnode op for read
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*/
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/* ARGSUSED */
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int
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dead_read(vp, uio, ioflag, cred)
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struct vnode *vp;
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struct uio *uio;
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int ioflag;
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struct ucred *cred;
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{
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if (chkvnlock(vp))
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panic("dead_read: lock");
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/*
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* Return EOF for character devices, EIO for others
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*/
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if (vp->v_type != VCHR)
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return (EIO);
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return (0);
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}
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/*
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* Vnode op for write
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*/
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/* ARGSUSED */
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int
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dead_write(vp, uio, ioflag, cred)
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register struct vnode *vp;
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struct uio *uio;
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int ioflag;
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struct ucred *cred;
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{
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if (chkvnlock(vp))
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panic("dead_write: lock");
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return (EIO);
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}
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/*
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* Device ioctl operation.
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*/
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/* ARGSUSED */
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int
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dead_ioctl(vp, com, data, fflag, cred, p)
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struct vnode *vp;
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register int com;
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caddr_t data;
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int fflag;
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struct ucred *cred;
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struct proc *p;
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{
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if (!chkvnlock(vp))
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return (EBADF);
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return (VOP_IOCTL(vp, com, data, fflag, cred, p));
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}
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/* ARGSUSED */
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int
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dead_select(vp, which, fflags, cred, p)
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struct vnode *vp;
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int which, fflags;
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struct ucred *cred;
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struct proc *p;
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{
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/*
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* Let the user find out that the descriptor is gone.
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*/
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return (1);
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}
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/*
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* Just call the device strategy routine
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*/
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int
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dead_strategy(bp)
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register struct buf *bp;
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{
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if (bp->b_vp == NULL || !chkvnlock(bp->b_vp)) {
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bp->b_flags |= B_ERROR;
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biodone(bp);
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return (EIO);
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}
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return (VOP_STRATEGY(bp));
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}
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/*
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* Wait until the vnode has finished changing state.
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*/
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int
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dead_lock(vp)
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struct vnode *vp;
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{
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if (!chkvnlock(vp))
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return (0);
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return (VOP_LOCK(vp));
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}
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/*
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* Wait until the vnode has finished changing state.
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*/
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int
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dead_bmap(vp, bn, vpp, bnp)
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struct vnode *vp;
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daddr_t bn;
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struct vnode **vpp;
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daddr_t *bnp;
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{
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if (!chkvnlock(vp))
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return (EIO);
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return (VOP_BMAP(vp, bn, vpp, bnp));
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}
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/*
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* Print out the contents of a dead vnode.
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*/
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/* ARGSUSED */
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void
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dead_print(vp)
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struct vnode *vp;
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{
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printf("tag VT_NON, dead vnode\n");
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}
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/*
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* Empty vnode failed operation
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*/
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int
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dead_ebadf()
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{
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return (EBADF);
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}
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/*
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* Empty vnode bad operation
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*/
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volatile void
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dead_badop()
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{
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panic("dead_badop called");
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/* NOTREACHED */
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}
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/*
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* Empty vnode null operation
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*/
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int
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dead_nullop()
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{
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return (0);
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}
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/*
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* We have to wait during times when the vnode is
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* in a state of change.
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*/
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int
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chkvnlock(vp)
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register struct vnode *vp;
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{
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int locked = 0;
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while (vp->v_flag & VXLOCK) {
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vp->v_flag |= VXWANT;
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tsleep((caddr_t)vp, PINOD, "chkvunlock", 0);
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locked = 1;
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}
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return (locked);
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}
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