[apple/xnu.git] / bsd / miscfs / deadfs / dead_vnops.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 1989, 1993
 *	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.
 *
 *	@(#)dead_vnops.c	8.3 (Berkeley) 5/14/95
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/vnode.h>
#include <sys/errno.h>
#include <sys/namei.h>
#include <sys/buf.h>
#include <vfs/vfs_support.h>

/*
 * Prototypes for dead operations on vnodes.
 */
int	dead_badop(),
	dead_ebadf();
int	dead_lookup __P((struct vop_lookup_args *));
#define dead_create ((int (*) __P((struct  vop_create_args *)))dead_badop)
#define dead_mknod ((int (*) __P((struct  vop_mknod_args *)))dead_badop)
int	dead_open __P((struct vop_open_args *));
#define dead_close ((int (*) __P((struct  vop_close_args *)))nullop)
#define dead_access ((int (*) __P((struct  vop_access_args *)))dead_ebadf)
#define dead_getattr ((int (*) __P((struct  vop_getattr_args *)))dead_ebadf)
#define dead_setattr ((int (*) __P((struct  vop_setattr_args *)))dead_ebadf)
int	dead_read __P((struct vop_read_args *));
int	dead_write __P((struct vop_write_args *));
int	dead_ioctl __P((struct vop_ioctl_args *));
int	dead_select __P((struct vop_select_args *));
#define dead_mmap ((int (*) __P((struct  vop_mmap_args *)))dead_badop)
#define dead_fsync ((int (*) __P((struct  vop_fsync_args *)))nullop)
#define dead_seek ((int (*) __P((struct  vop_seek_args *)))nullop)
#define dead_remove ((int (*) __P((struct  vop_remove_args *)))dead_badop)
#define dead_link ((int (*) __P((struct  vop_link_args *)))dead_badop)
#define dead_rename ((int (*) __P((struct  vop_rename_args *)))dead_badop)
#define dead_mkdir ((int (*) __P((struct  vop_mkdir_args *)))dead_badop)
#define dead_rmdir ((int (*) __P((struct  vop_rmdir_args *)))dead_badop)
#define dead_symlink ((int (*) __P((struct  vop_symlink_args *)))dead_badop)
#define dead_readdir ((int (*) __P((struct  vop_readdir_args *)))dead_ebadf)
#define dead_readlink ((int (*) __P((struct  vop_readlink_args *)))dead_ebadf)
#define dead_abortop ((int (*) __P((struct  vop_abortop_args *)))dead_badop)
#define dead_inactive ((int (*) __P((struct  vop_inactive_args *)))nullop)
#define dead_reclaim ((int (*) __P((struct  vop_reclaim_args *)))nullop)
int	dead_lock __P((struct vop_lock_args *));
#define dead_unlock ((int (*) __P((struct  vop_unlock_args *)))nullop)
int	dead_bmap __P((struct vop_bmap_args *));
int	dead_strategy __P((struct vop_strategy_args *));
int	dead_print __P((struct vop_print_args *));
#define dead_islocked ((int (*) __P((struct  vop_islocked_args *)))nullop)
#define dead_pathconf ((int (*) __P((struct  vop_pathconf_args *)))dead_ebadf)
#define dead_advlock ((int (*) __P((struct  vop_advlock_args *)))dead_ebadf)
#define dead_blkatoff ((int (*) __P((struct  vop_blkatoff_args *)))dead_badop)
#define dead_valloc ((int (*) __P((struct  vop_valloc_args *)))dead_badop)
#define dead_vfree ((int (*) __P((struct  vop_vfree_args *)))dead_badop)
#define dead_truncate ((int (*) __P((struct  vop_truncate_args *)))nullop)
#define dead_update ((int (*) __P((struct  vop_update_args *)))nullop)
#define dead_bwrite ((int (*) __P((struct  vop_bwrite_args *)))nullop)
int	dead_pagein __P((struct vop_pagein_args *));
int	dead_pageout __P((struct vop_pageout_args *));
int dead_blktooff __P((struct vop_blktooff_args *));
int dead_offtoblk __P((struct vop_offtoblk_args *));
int dead_cmap __P((struct vop_cmap_args *));

#define VOPFUNC int (*)(void *)
int (**dead_vnodeop_p)(void *);
struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
	{ &vop_default_desc, (VOPFUNC)vn_default_error },
	{ &vop_lookup_desc, (VOPFUNC)dead_lookup },	/* lookup */
	{ &vop_create_desc, (VOPFUNC)dead_create },	/* create */
	{ &vop_mknod_desc, (VOPFUNC)dead_mknod },	/* mknod */
	{ &vop_open_desc, (VOPFUNC)dead_open },		/* open */
	{ &vop_close_desc, (VOPFUNC)dead_close },	/* close */
	{ &vop_access_desc, (VOPFUNC)dead_access },	/* access */
	{ &vop_getattr_desc, (VOPFUNC)dead_getattr },	/* getattr */
	{ &vop_setattr_desc, (VOPFUNC)dead_setattr },	/* setattr */
	{ &vop_read_desc, (VOPFUNC)dead_read },		/* read */
	{ &vop_write_desc, (VOPFUNC)dead_write },	/* write */
	{ &vop_ioctl_desc, (VOPFUNC)dead_ioctl },	/* ioctl */
	{ &vop_select_desc, (VOPFUNC)dead_select },	/* select */
	{ &vop_mmap_desc, (VOPFUNC)dead_mmap },		/* mmap */
	{ &vop_fsync_desc, (VOPFUNC)dead_fsync },	/* fsync */
	{ &vop_seek_desc, (VOPFUNC)dead_seek },		/* seek */
	{ &vop_remove_desc, (VOPFUNC)dead_remove },	/* remove */
	{ &vop_link_desc, (VOPFUNC)dead_link },		/* link */
	{ &vop_rename_desc, (VOPFUNC)dead_rename },	/* rename */
	{ &vop_mkdir_desc, (VOPFUNC)dead_mkdir },	/* mkdir */
	{ &vop_rmdir_desc, (VOPFUNC)dead_rmdir },	/* rmdir */
	{ &vop_symlink_desc, (VOPFUNC)dead_symlink },	/* symlink */
	{ &vop_readdir_desc, (VOPFUNC)dead_readdir },	/* readdir */
	{ &vop_readlink_desc, (VOPFUNC)dead_readlink },	/* readlink */
	{ &vop_abortop_desc, (VOPFUNC)dead_abortop },	/* abortop */
	{ &vop_inactive_desc, (VOPFUNC)dead_inactive },	/* inactive */
	{ &vop_reclaim_desc, (VOPFUNC)dead_reclaim },	/* reclaim */
	{ &vop_lock_desc, (VOPFUNC)dead_lock },		/* lock */
	{ &vop_unlock_desc, (VOPFUNC)dead_unlock },	/* unlock */
	{ &vop_bmap_desc, (VOPFUNC)dead_bmap },		/* bmap */
	{ &vop_strategy_desc, (VOPFUNC)dead_strategy },	/* strategy */
	{ &vop_print_desc, (VOPFUNC)dead_print },	/* print */
	{ &vop_islocked_desc, (VOPFUNC)dead_islocked },	/* islocked */
	{ &vop_pathconf_desc, (VOPFUNC)dead_pathconf },	/* pathconf */
	{ &vop_advlock_desc, (VOPFUNC)dead_advlock },	/* advlock */
	{ &vop_blkatoff_desc, (VOPFUNC)dead_blkatoff },	/* blkatoff */
	{ &vop_valloc_desc, (VOPFUNC)dead_valloc },	/* valloc */
	{ &vop_vfree_desc, (VOPFUNC)dead_vfree },	/* vfree */
	{ &vop_truncate_desc, (VOPFUNC)dead_truncate },	/* truncate */
	{ &vop_update_desc, (VOPFUNC)dead_update },	/* update */
	{ &vop_bwrite_desc, (VOPFUNC)dead_bwrite },	/* bwrite */
	{ &vop_pagein_desc, (VOPFUNC)err_pagein },	/* Pagein */
	{ &vop_pageout_desc, (VOPFUNC)err_pageout },	/* Pageout */
        { &vop_copyfile_desc, (VOPFUNC)err_copyfile },	/* Copyfile */
	{ &vop_blktooff_desc, (VOPFUNC)dead_blktooff },	/* blktooff */
	{ &vop_offtoblk_desc, (VOPFUNC)dead_offtoblk },	/* offtoblk */
  	{ &vop_cmap_desc, (VOPFUNC)dead_cmap },		/* cmap */
	{ (struct vnodeop_desc*)NULL, (VOPFUNC)NULL }
};
struct vnodeopv_desc dead_vnodeop_opv_desc =
	{ &dead_vnodeop_p, dead_vnodeop_entries };

/*
 * Trivial lookup routine that always fails.
 */
/* ARGSUSED */
int
dead_lookup(ap)
	struct vop_lookup_args /* {
		struct vnode * a_dvp;
		struct vnode ** a_vpp;
		struct componentname * a_cnp;
	} */ *ap;
{

	*ap->a_vpp = NULL;
	return (ENOTDIR);
}

/*
 * Open always fails as if device did not exist.
 */
/* ARGSUSED */
int
dead_open(ap)
	struct vop_open_args /* {
		struct vnode *a_vp;
		int  a_mode;
		struct ucred *a_cred;
		struct proc *a_p;
	} */ *ap;
{

	return (ENXIO);
}

/*
 * Vnode op for read
 */
/* ARGSUSED */
int
dead_read(ap)
	struct vop_read_args /* {
		struct vnode *a_vp;
		struct uio *a_uio;
		int  a_ioflag;
		struct ucred *a_cred;
	} */ *ap;
{

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

/*
 * Vnode op for write
 */
/* ARGSUSED */
int
dead_write(ap)
	struct vop_write_args /* {
		struct vnode *a_vp;
		struct uio *a_uio;
		int  a_ioflag;
		struct ucred *a_cred;
	} */ *ap;
{

	if (chkvnlock(ap->a_vp))
		panic("dead_write: lock");
	return (EIO);
}

/*
 * Device ioctl operation.
 */
/* ARGSUSED */
int
dead_ioctl(ap)
	struct vop_ioctl_args /* {
		struct vnode *a_vp;
		u_long a_command;
		caddr_t  a_data;
		int  a_fflag;
		struct ucred *a_cred;
		struct proc *a_p;
	} */ *ap;
{

	if (!chkvnlock(ap->a_vp))
		return (EBADF);
	return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap));
}

/* ARGSUSED */
int
dead_select(ap)
	struct vop_select_args /* {
		struct vnode *a_vp;
		int  a_which;
		int  a_fflags;
		struct ucred *a_cred;
		void *a_wql;
		struct proc *a_p;
	} */ *ap;
{

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

/*
 * Just call the device strategy routine
 */
int
dead_strategy(ap)
	struct vop_strategy_args /* {
		struct buf *a_bp;
	} */ *ap;
{

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

/*
 * Wait until the vnode has finished changing state.
 */
int
dead_lock(ap)
	struct vop_lock_args /* {
		struct vnode *a_vp;
	} */ *ap;
{

	struct vnode *vp = ap->a_vp;

	/*
	 * Since we are not using the lock manager, we must clear
	 * the interlock here.
	 */
	if (ap->a_flags & LK_INTERLOCK) {
		simple_unlock(&vp->v_interlock);
		ap->a_flags &= ~LK_INTERLOCK;
	}
	if (!chkvnlock(ap->a_vp))
		return (0);
	return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap));
}

/*
 * Wait until the vnode has finished changing state.
 */
int
dead_bmap(ap)
	struct vop_bmap_args /* {
		struct vnode *a_vp;
		daddr_t  a_bn;
		struct vnode **a_vpp;
		daddr_t *a_bnp;
		int *a_runp;
	} */ *ap;
{

	if (!chkvnlock(ap->a_vp))
		return (EIO);
	return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp));
}

/*
 * Wait until the vnode has finished changing state.
 */
int
dead_cmap(ap)
	struct vop_cmap_args /* {
		struct vnode *a_vp;
		off_t a_foffset;
		size_t a_size;
		daddr_t *a_bpn;
		size_t *a_run;
		void *a_poff;
	} */ *ap;
{

	if (!chkvnlock(ap->a_vp))
		return (EIO);
	return (VOP_CMAP(ap->a_vp, ap->a_foffset, ap->a_size, ap->a_bpn, ap->a_run, ap->a_poff));
}

/*
 * Print out the contents of a dead vnode.
 */
/* ARGSUSED */
int
dead_print(ap)
	struct vop_print_args /* {
		struct vnode *a_vp;
	} */ *ap;
{

	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;
		sleep((caddr_t)vp, PINOD);
		locked = 1;
	}
	return (locked);
}


/* Blktooff */
int
dead_blktooff(ap)
	struct vop_blktooff_args /* {
		struct vnode *a_vp;
		daddr_t a_lblkno;
		off_t *a_offset;    
	} */ *ap;
{
    if (!chkvnlock(ap->a_vp))
		return (EIO);

	*ap->a_offset = (off_t)-1;	/* failure */
	return (0);
}
/* Blktooff */
int
dead_offtoblk(ap)
struct vop_offtoblk_args /* {
	struct vnode *a_vp;
	off_t a_offset;    
	daddr_t *a_lblkno;
	} */ *ap;
{
    if (!chkvnlock(ap->a_vp))
		return (EIO);

	*ap->a_lblkno = (daddr_t)-1;	/* failure */
	return (0);
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
d7e50217	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
d7e50217 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
d7e50217 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	26	/*
	27	* Copyright (c) 1989, 1993
	28	* The Regents of the University of California. All rights reserved.
	29	*
	30	* Redistribution and use in source and binary forms, with or without
	31	* modification, are permitted provided that the following conditions
	32	* are met:
	33	* 1. Redistributions of source code must retain the above copyright
	34	* notice, this list of conditions and the following disclaimer.
	35	* 2. Redistributions in binary form must reproduce the above copyright
	36	* notice, this list of conditions and the following disclaimer in the
	37	* documentation and/or other materials provided with the distribution.
	38	* 3. All advertising materials mentioning features or use of this software
	39	* must display the following acknowledgement:
	40	* This product includes software developed by the University of
	41	* California, Berkeley and its contributors.
	42	* 4. Neither the name of the University nor the names of its contributors
	43	* may be used to endorse or promote products derived from this software
	44	* without specific prior written permission.
	45	*
	46	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	47	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	48	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	49	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	50	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	51	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	52	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	53	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	54	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	55	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	56	* SUCH DAMAGE.
	57	*
	58	* @(#)dead_vnops.c 8.3 (Berkeley) 5/14/95
	59	*/
	60
	61	#include <sys/param.h>
	62	#include <sys/systm.h>
	63	#include <sys/time.h>
	64	#include <sys/vnode.h>
	65	#include <sys/errno.h>
	66	#include <sys/namei.h>
	67	#include <sys/buf.h>
	68	#include <vfs/vfs_support.h>
	69
	70	/*
	71	* Prototypes for dead operations on vnodes.
	72	*/
	73	int dead_badop(),
	74	dead_ebadf();
	75	int dead_lookup __P((struct vop_lookup_args *));
	76	#define dead_create ((int () __P((struct vop_create_args )))dead_badop)
	77	#define dead_mknod ((int () __P((struct vop_mknod_args )))dead_badop)
	78	int dead_open __P((struct vop_open_args *));
	79	#define dead_close ((int () __P((struct vop_close_args )))nullop)
	80	#define dead_access ((int () __P((struct vop_access_args )))dead_ebadf)
	81	#define dead_getattr ((int () __P((struct vop_getattr_args )))dead_ebadf)
	82	#define dead_setattr ((int () __P((struct vop_setattr_args )))dead_ebadf)
	83	int dead_read __P((struct vop_read_args *));
	84	int dead_write __P((struct vop_write_args *));
	85	int dead_ioctl __P((struct vop_ioctl_args *));
86	int dead_select __P((struct vop_select_args *));
87	#define dead_mmap ((int () __P((struct vop_mmap_args )))dead_badop)
88	#define dead_fsync ((int () __P((struct vop_fsync_args )))nullop)
89	#define dead_seek ((int () __P((struct vop_seek_args )))nullop)
90	#define dead_remove ((int () __P((struct vop_remove_args )))dead_badop)
91	#define dead_link ((int () __P((struct vop_link_args )))dead_badop)
92	#define dead_rename ((int () __P((struct vop_rename_args )))dead_badop)
93	#define dead_mkdir ((int () __P((struct vop_mkdir_args )))dead_badop)
94	#define dead_rmdir ((int () __P((struct vop_rmdir_args )))dead_badop)
95	#define dead_symlink ((int () __P((struct vop_symlink_args )))dead_badop)
96	#define dead_readdir ((int () __P((struct vop_readdir_args )))dead_ebadf)
97	#define dead_readlink ((int () __P((struct vop_readlink_args )))dead_ebadf)
98	#define dead_abortop ((int () __P((struct vop_abortop_args )))dead_badop)
99	#define dead_inactive ((int () __P((struct vop_inactive_args )))nullop)
100	#define dead_reclaim ((int () __P((struct vop_reclaim_args )))nullop)
101	int dead_lock __P((struct vop_lock_args *));
102	#define dead_unlock ((int () __P((struct vop_unlock_args )))nullop)
103	int dead_bmap __P((struct vop_bmap_args *));
104	int dead_strategy __P((struct vop_strategy_args *));
105	int dead_print __P((struct vop_print_args *));
106	#define dead_islocked ((int () __P((struct vop_islocked_args )))nullop)
107	#define dead_pathconf ((int () __P((struct vop_pathconf_args )))dead_ebadf)
108	#define dead_advlock ((int () __P((struct vop_advlock_args )))dead_ebadf)
109	#define dead_blkatoff ((int () __P((struct vop_blkatoff_args )))dead_badop)
110	#define dead_valloc ((int () __P((struct vop_valloc_args )))dead_badop)
111	#define dead_vfree ((int () __P((struct vop_vfree_args )))dead_badop)
112	#define dead_truncate ((int () __P((struct vop_truncate_args )))nullop)
113	#define dead_update ((int () __P((struct vop_update_args )))nullop)
114	#define dead_bwrite ((int () __P((struct vop_bwrite_args )))nullop)
115	int dead_pagein __P((struct vop_pagein_args *));
116	int dead_pageout __P((struct vop_pageout_args *));
117	int dead_blktooff __P((struct vop_blktooff_args *));
118	int dead_offtoblk __P((struct vop_offtoblk_args *));
119	int dead_cmap __P((struct vop_cmap_args *));
120
121	#define VOPFUNC int ()(void )
122	int (*dead_vnodeop_p)(void );
123	struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
124	{ &vop_default_desc, (VOPFUNC)vn_default_error },
125	{ &vop_lookup_desc, (VOPFUNC)dead_lookup }, /* lookup */
126	{ &vop_create_desc, (VOPFUNC)dead_create }, /* create */
127	{ &vop_mknod_desc, (VOPFUNC)dead_mknod }, /* mknod */
128	{ &vop_open_desc, (VOPFUNC)dead_open }, /* open */
129	{ &vop_close_desc, (VOPFUNC)dead_close }, /* close */
130	{ &vop_access_desc, (VOPFUNC)dead_access }, /* access */
131	{ &vop_getattr_desc, (VOPFUNC)dead_getattr }, /* getattr */
132	{ &vop_setattr_desc, (VOPFUNC)dead_setattr }, /* setattr */
133	{ &vop_read_desc, (VOPFUNC)dead_read }, /* read */
134	{ &vop_write_desc, (VOPFUNC)dead_write }, /* write */
135	{ &vop_ioctl_desc, (VOPFUNC)dead_ioctl }, /* ioctl */
136	{ &vop_select_desc, (VOPFUNC)dead_select }, /* select */
137	{ &vop_mmap_desc, (VOPFUNC)dead_mmap }, /* mmap */
138	{ &vop_fsync_desc, (VOPFUNC)dead_fsync }, /* fsync */
139	{ &vop_seek_desc, (VOPFUNC)dead_seek }, /* seek */
140	{ &vop_remove_desc, (VOPFUNC)dead_remove }, /* remove */
141	{ &vop_link_desc, (VOPFUNC)dead_link }, /* link */
142	{ &vop_rename_desc, (VOPFUNC)dead_rename }, /* rename */
143	{ &vop_mkdir_desc, (VOPFUNC)dead_mkdir }, /* mkdir */
144	{ &vop_rmdir_desc, (VOPFUNC)dead_rmdir }, /* rmdir */
145	{ &vop_symlink_desc, (VOPFUNC)dead_symlink }, /* symlink */
146	{ &vop_readdir_desc, (VOPFUNC)dead_readdir }, /* readdir */
147	{ &vop_readlink_desc, (VOPFUNC)dead_readlink }, /* readlink */
148	{ &vop_abortop_desc, (VOPFUNC)dead_abortop }, /* abortop */
149	{ &vop_inactive_desc, (VOPFUNC)dead_inactive }, /* inactive */
150	{ &vop_reclaim_desc, (VOPFUNC)dead_reclaim }, /* reclaim */
151	{ &vop_lock_desc, (VOPFUNC)dead_lock }, /* lock */
152	{ &vop_unlock_desc, (VOPFUNC)dead_unlock }, /* unlock */
153	{ &vop_bmap_desc, (VOPFUNC)dead_bmap }, /* bmap */
154	{ &vop_strategy_desc, (VOPFUNC)dead_strategy }, /* strategy */
155	{ &vop_print_desc, (VOPFUNC)dead_print }, /* print */
156	{ &vop_islocked_desc, (VOPFUNC)dead_islocked }, /* islocked */
157	{ &vop_pathconf_desc, (VOPFUNC)dead_pathconf }, /* pathconf */
158	{ &vop_advlock_desc, (VOPFUNC)dead_advlock }, /* advlock */
159	{ &vop_blkatoff_desc, (VOPFUNC)dead_blkatoff }, /* blkatoff */
160	{ &vop_valloc_desc, (VOPFUNC)dead_valloc }, /* valloc */
161	{ &vop_vfree_desc, (VOPFUNC)dead_vfree }, /* vfree */
162	{ &vop_truncate_desc, (VOPFUNC)dead_truncate }, /* truncate */
163	{ &vop_update_desc, (VOPFUNC)dead_update }, /* update */
164	{ &vop_bwrite_desc, (VOPFUNC)dead_bwrite }, /* bwrite */
165	{ &vop_pagein_desc, (VOPFUNC)err_pagein }, /* Pagein */
166	{ &vop_pageout_desc, (VOPFUNC)err_pageout }, /* Pageout */
167	{ &vop_copyfile_desc, (VOPFUNC)err_copyfile }, /* Copyfile */
168	{ &vop_blktooff_desc, (VOPFUNC)dead_blktooff }, /* blktooff */
169	{ &vop_offtoblk_desc, (VOPFUNC)dead_offtoblk }, /* offtoblk */
170	{ &vop_cmap_desc, (VOPFUNC)dead_cmap }, /* cmap */
171	{ (struct vnodeop_desc*)NULL, (VOPFUNC)NULL }
172	};
173	struct vnodeopv_desc dead_vnodeop_opv_desc =
174	{ &dead_vnodeop_p, dead_vnodeop_entries };
175
176	/*
177	* Trivial lookup routine that always fails.
178	*/
179	/* ARGSUSED */
180	int
181	dead_lookup(ap)
182	struct vop_lookup_args /* {
183	struct vnode * a_dvp;
184	struct vnode ** a_vpp;
185	struct componentname * a_cnp;
186	} / ap;
187	{
188
189	*ap->a_vpp = NULL;
190	return (ENOTDIR);
191	}
192
193	/*
194	* Open always fails as if device did not exist.
195	*/
196	/* ARGSUSED */
197	int
198	dead_open(ap)
199	struct vop_open_args /* {
200	struct vnode *a_vp;
201	int a_mode;
202	struct ucred *a_cred;
203	struct proc *a_p;
204	} / ap;
205	{
206
207	return (ENXIO);
208	}
209
210	/*
211	* Vnode op for read
212	*/
213	/* ARGSUSED */
214	int
215	dead_read(ap)
216	struct vop_read_args /* {
217	struct vnode *a_vp;
218	struct uio *a_uio;
219	int a_ioflag;
220	struct ucred *a_cred;
221	} / ap;
222	{
223
224	if (chkvnlock(ap->a_vp))
225	panic("dead_read: lock");
226	/*
227	* Return EOF for character devices, EIO for others
228	*/
229	if (ap->a_vp->v_type != VCHR)
230	return (EIO);
231	return (0);
232	}
233
234	/*
235	* Vnode op for write
236	*/
237	/* ARGSUSED */
238	int
239	dead_write(ap)
240	struct vop_write_args /* {
241	struct vnode *a_vp;
242	struct uio *a_uio;
243	int a_ioflag;
244	struct ucred *a_cred;
245	} / ap;
246	{
247
248	if (chkvnlock(ap->a_vp))
249	panic("dead_write: lock");
250	return (EIO);
251	}
252
253	/*
254	* Device ioctl operation.
255	*/
256	/* ARGSUSED */
257	int
258	dead_ioctl(ap)
259	struct vop_ioctl_args /* {
260	struct vnode *a_vp;
261	u_long a_command;
262	caddr_t a_data;
263	int a_fflag;
264	struct ucred *a_cred;
265	struct proc *a_p;
266	} / ap;
267	{
268
269	if (!chkvnlock(ap->a_vp))
270	return (EBADF);
271	return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap));
272	}
273
274	/* ARGSUSED */
275	int
276	dead_select(ap)
277	struct vop_select_args /* {
278	struct vnode *a_vp;
279	int a_which;
280	int a_fflags;
281	struct ucred *a_cred;
0b4e3aa0	282	void *a_wql;
1c79356b A	283	struct proc *a_p;
	284	} / ap;
	285	{
	286
	287	/*
	288	* Let the user find out that the descriptor is gone.
	289	*/
	290	return (1);
	291	}
	292
	293	/*
	294	* Just call the device strategy routine
	295	*/
	296	int
	297	dead_strategy(ap)
	298	struct vop_strategy_args /* {
	299	struct buf *a_bp;
	300	} / ap;
	301	{
	302
	303	if (ap->a_bp->b_vp == NULL \|\| !chkvnlock(ap->a_bp->b_vp)) {
	304	ap->a_bp->b_flags \|= B_ERROR;
	305	biodone(ap->a_bp);
	306	return (EIO);
	307	}
	308	return (VOP_STRATEGY(ap->a_bp));
	309	}
	310
	311	/*
	312	* Wait until the vnode has finished changing state.
	313	*/
	314	int
	315	dead_lock(ap)
	316	struct vop_lock_args /* {
	317	struct vnode *a_vp;
	318	} / ap;
	319	{
	320
	321	struct vnode *vp = ap->a_vp;
	322
	323	/*
	324	* Since we are not using the lock manager, we must clear
	325	* the interlock here.
	326	*/
	327	if (ap->a_flags & LK_INTERLOCK) {
	328	simple_unlock(&vp->v_interlock);
	329	ap->a_flags &= ~LK_INTERLOCK;
	330	}
	331	if (!chkvnlock(ap->a_vp))
	332	return (0);
	333	return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap));
	334	}
	335
	336	/*
	337	* Wait until the vnode has finished changing state.
	338	*/
	339	int
	340	dead_bmap(ap)
	341	struct vop_bmap_args /* {
	342	struct vnode *a_vp;
	343	daddr_t a_bn;
	344	struct vnode **a_vpp;
	345	daddr_t *a_bnp;
	346	int *a_runp;
347	} / ap;
348	{
349
350	if (!chkvnlock(ap->a_vp))
351	return (EIO);
352	return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp));
353	}
354
355	/*
356	* Wait until the vnode has finished changing state.
357	*/
358	int
359	dead_cmap(ap)
360	struct vop_cmap_args /* {
361	struct vnode *a_vp;
362	off_t a_foffset;
363	size_t a_size;
364	daddr_t *a_bpn;
365	size_t *a_run;
366	void *a_poff;
367	} / ap;
368	{
369
370	if (!chkvnlock(ap->a_vp))
371	return (EIO);
372	return (VOP_CMAP(ap->a_vp, ap->a_foffset, ap->a_size, ap->a_bpn, ap->a_run, ap->a_poff));
373	}
374
375	/*
376	* Print out the contents of a dead vnode.
377	*/
378	/* ARGSUSED */
379	int
380	dead_print(ap)
381	struct vop_print_args /* {
382	struct vnode *a_vp;
383	} / ap;
384	{
385
386	printf("tag VT_NON, dead vnode\n");
387	}
388
389	/*
390	* Empty vnode failed operation
391	*/
392	int
393	dead_ebadf()
394	{
395
396	return (EBADF);
397	}
398
399	/*
400	* Empty vnode bad operation
401	*/
402	int
403	dead_badop()
404	{
405
406	panic("dead_badop called");
407	/* NOTREACHED */
408	}
409
410	/*
411	* Empty vnode null operation
412	*/
413	int
414	dead_nullop()
415	{
416
417	return (0);
418	}
419
420	/*
421	* We have to wait during times when the vnode is
422	* in a state of change.
423	*/
424	int
425	chkvnlock(vp)
426	register struct vnode *vp;
427	{
428	int locked = 0;
429
430	while (vp->v_flag & VXLOCK) {
431	vp->v_flag \|= VXWANT;
432	sleep((caddr_t)vp, PINOD);
433	locked = 1;
434	}
435	return (locked);
436	}
437
438
439	/* Blktooff */
440	int
441	dead_blktooff(ap)
442	struct vop_blktooff_args /* {
443	struct vnode *a_vp;
444	daddr_t a_lblkno;
445	off_t *a_offset;
446	} / ap;
447	{
448	if (!chkvnlock(ap->a_vp))
449	return (EIO);
450
451	ap->a_offset = (off_t)-1; / failure */
452	return (0);
453	}
454	/* Blktooff */
455	int
456	dead_offtoblk(ap)
457	struct vop_offtoblk_args /* {
458	struct vnode *a_vp;
459	off_t a_offset;
460	daddr_t *a_lblkno;
461	} / ap;
462	{
463	if (!chkvnlock(ap->a_vp))
464	return (EIO);
465
466	ap->a_lblkno = (daddr_t)-1; / failure */
467	return (0);
468	}