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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 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_internal.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(void *);
int	dead_ebadf(void *);
int	dead_lookup(struct vnop_lookup_args *);
#define dead_create (int (*)(struct  vnop_create_args *))dead_badop
#define dead_mknod (int (*)(struct  vnop_mknod_args *))dead_badop
int	dead_open(struct vnop_open_args *);
#define dead_close (int (*)(struct  vnop_close_args *))nullop
#define dead_access (int (*)(struct  vnop_access_args *))dead_ebadf
#define dead_getattr (int (*)(struct  vnop_getattr_args *))dead_ebadf
#define dead_setattr (int (*)(struct  vnop_setattr_args *))dead_ebadf
int	dead_read(struct vnop_read_args *);
int	dead_write(struct vnop_write_args *);
int	dead_ioctl(struct vnop_ioctl_args *);
int	dead_select(struct vnop_select_args *);
#define dead_mmap (int (*)(struct  vnop_mmap_args *))dead_badop
#define dead_fsync (int (*)(struct  vnop_fsync_args *))nullop
#define dead_remove (int (*)(struct  vnop_remove_args ))dead_badop
#define dead_link (int (*)(struct  vnop_link_args *))dead_badop
#define dead_rename (int (*)(struct  vnop_rename_args *))dead_badop
#define dead_mkdir (int (*)(struct  vnop_mkdir_args *))dead_badop
#define dead_rmdir (int (*)(struct  vnop_rmdir_args *))dead_badop
#define dead_symlink (int (*)(struct  vnop_symlink_args *))dead_badop
#define dead_readdir (int (*)(struct  vnop_readdir_args *))dead_ebadf
#define dead_readlink (int (*)(struct  vnop_readlink_args *))dead_ebadf
#define dead_inactive (int (*)(struct  vnop_inactive_args *))nullop
#define dead_reclaim (int (*)(struct  vnop_reclaim_args *))nullop
int	dead_strategy(struct vnop_strategy_args *);
#define dead_pathconf (int (*)(struct  vnop_pathconf_args *))dead_ebadf
#define dead_advlock (int (*)(struct  vnop_advlock_args *))dead_ebadf
#define dead_bwrite (int (*)(struct  vnop_bwrite_args *))nullop
int	dead_pagein(struct vnop_pagein_args *);
int	dead_pageout(struct vnop_pageout_args *);
int dead_blktooff(struct vnop_blktooff_args *);
int dead_offtoblk(struct vnop_offtoblk_args *);
int dead_blockmap(struct vnop_blockmap_args *);

#define VOPFUNC int (*)(void *)
int (**dead_vnodeop_p)(void *);
struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
	{ &vnop_default_desc, (VOPFUNC)vn_default_error },
	{ &vnop_lookup_desc, (VOPFUNC)dead_lookup },	/* lookup */
	{ &vnop_create_desc, (VOPFUNC)dead_create },	/* create */
	{ &vnop_open_desc, (VOPFUNC)dead_open },		/* open */
	{ &vnop_mknod_desc, (VOPFUNC)dead_mknod },		/* mknod */
	{ &vnop_close_desc, (VOPFUNC)dead_close },	/* close */
	{ &vnop_access_desc, (VOPFUNC)dead_access },	/* access */
	{ &vnop_getattr_desc, (VOPFUNC)dead_getattr },	/* getattr */
	{ &vnop_setattr_desc, (VOPFUNC)dead_setattr },	/* setattr */
	{ &vnop_read_desc, (VOPFUNC)dead_read },		/* read */
	{ &vnop_write_desc, (VOPFUNC)dead_write },	/* write */
	{ &vnop_ioctl_desc, (VOPFUNC)dead_ioctl },	/* ioctl */
	{ &vnop_select_desc, (VOPFUNC)dead_select },	/* select */
	{ &vnop_mmap_desc, (VOPFUNC)dead_mmap },		/* mmap */
	{ &vnop_fsync_desc, (VOPFUNC)dead_fsync },	/* fsync */
	{ &vnop_remove_desc, (VOPFUNC)dead_remove },	/* remove */
	{ &vnop_link_desc, (VOPFUNC)dead_link },		/* link */
	{ &vnop_rename_desc, (VOPFUNC)dead_rename },	/* rename */
	{ &vnop_mkdir_desc, (VOPFUNC)dead_mkdir },	/* mkdir */
	{ &vnop_rmdir_desc, (VOPFUNC)dead_rmdir },	/* rmdir */
	{ &vnop_symlink_desc, (VOPFUNC)dead_symlink },	/* symlink */
	{ &vnop_readdir_desc, (VOPFUNC)dead_readdir },	/* readdir */
	{ &vnop_readlink_desc, (VOPFUNC)dead_readlink },	/* readlink */
	{ &vnop_inactive_desc, (VOPFUNC)dead_inactive },	/* inactive */
	{ &vnop_reclaim_desc, (VOPFUNC)dead_reclaim },	/* reclaim */
	{ &vnop_strategy_desc, (VOPFUNC)dead_strategy },	/* strategy */
	{ &vnop_pathconf_desc, (VOPFUNC)dead_pathconf },	/* pathconf */
	{ &vnop_advlock_desc, (VOPFUNC)dead_advlock },	/* advlock */
	{ &vnop_bwrite_desc, (VOPFUNC)dead_bwrite },	/* bwrite */
	{ &vnop_pagein_desc, (VOPFUNC)err_pagein },	/* Pagein */
	{ &vnop_pageout_desc, (VOPFUNC)err_pageout },	/* Pageout */
        { &vnop_copyfile_desc, (VOPFUNC)err_copyfile },	/* Copyfile */
	{ &vnop_blktooff_desc, (VOPFUNC)dead_blktooff },	/* blktooff */
	{ &vnop_offtoblk_desc, (VOPFUNC)dead_offtoblk },	/* offtoblk */
  	{ &vnop_blockmap_desc, (VOPFUNC)dead_blockmap },		/* blockmap */
	{ (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 vnop_lookup_args /* {
		struct vnode * a_dvp;
		struct vnode ** a_vpp;
		struct componentname * a_cnp;
		vfs_context_t a_context;
	} */ *ap;
{

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

/*
 * Open always fails as if device did not exist.
 */
/* ARGSUSED */
int
dead_open(ap)
	struct vnop_open_args /* {
		struct vnode *a_vp;
		int  a_mode;
		vfs_context_t a_context;
	} */ *ap;
{

	return (ENXIO);
}

/*
 * Vnode op for read
 */
/* ARGSUSED */
int
dead_read(ap)
	struct vnop_read_args /* {
		struct vnode *a_vp;
		struct uio *a_uio;
		int  a_ioflag;
		vfs_context_t a_context;
	} */ *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 vnop_write_args /* {
		struct vnode *a_vp;
		struct uio *a_uio;
		int  a_ioflag;
		vfs_context_t a_context;
	} */ *ap;
{

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

/*
 * Device ioctl operation.
 */
/* ARGSUSED */
int
dead_ioctl(ap)
	struct vnop_ioctl_args /* {
		struct vnode *a_vp;
		u_long a_command;
		caddr_t  a_data;
		int  a_fflag;
		vfs_context_t a_context;
	} */ *ap;
{

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

/* ARGSUSED */
int
dead_select(ap)
	struct vnop_select_args /* {
		struct vnode *a_vp;
		int  a_which;
		int  a_fflags;
		kauth_cred_t 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 vnop_strategy_args /* {
		struct buf *a_bp;
	} */ *ap;
{

	if (buf_vnode(ap->a_bp) == NULL || !chkvnlock(buf_vnode(ap->a_bp))) {
	        buf_seterror(ap->a_bp, EIO);
		buf_biodone(ap->a_bp);
		return (EIO);
	}
	return (VNOP_STRATEGY(ap->a_bp));
}

/*
 * Wait until the vnode has finished changing state.
 */
int
dead_blockmap(ap)
	struct vnop_blockmap_args /* {
		struct vnode *a_vp;
		off_t a_foffset;
		size_t a_size;
		daddr64_t *a_bpn;
		size_t *a_run;
		void *a_poff;
		int flags;
		vfs_context_t a_context;
	} */ *ap;
{

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

/*
 * Empty vnode failed operation
 */
/* ARGSUSED */
int
dead_ebadf(void *dummy)
{

	return (EBADF);
}

/*
 * Empty vnode bad operation
 */
/* ARGSUSED */
int
dead_badop(void *dummy)
{

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

/*
 * Empty vnode null operation
 */
/* ARGSUSED */
int
dead_nullop(void *dummy)
{

	return (0);
}

/*
 * We have to wait during times when the vnode is
 * in a state of change.
 */
int
chkvnlock(__unused vnode_t vp)
{
	return (0);
}


/* Blktooff */
int
dead_blktooff(ap)
	struct vnop_blktooff_args /* {
		struct vnode *a_vp;
		daddr64_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 vnop_offtoblk_args /* {
	struct vnode *a_vp;
	off_t a_offset;    
	daddr64_t *a_lblkno;
	} */ *ap;
{
    if (!chkvnlock(ap->a_vp))
		return (EIO);

	*ap->a_lblkno = (daddr64_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	*
37839358 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
37839358 A	12	* This Original Code and all software distributed under the License are
37839358 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
37839358 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	23	/*
	24	* Copyright (c) 1989, 1993
	25	* The Regents of the University of California. All rights reserved.
	26	*
	27	* Redistribution and use in source and binary forms, with or without
	28	* modification, are permitted provided that the following conditions
	29	* are met:
	30	* 1. Redistributions of source code must retain the above copyright
	31	* notice, this list of conditions and the following disclaimer.
	32	* 2. Redistributions in binary form must reproduce the above copyright
	33	* notice, this list of conditions and the following disclaimer in the
	34	* documentation and/or other materials provided with the distribution.
	35	* 3. All advertising materials mentioning features or use of this software
	36	* must display the following acknowledgement:
	37	* This product includes software developed by the University of
	38	* California, Berkeley and its contributors.
	39	* 4. Neither the name of the University nor the names of its contributors
	40	* may be used to endorse or promote products derived from this software
	41	* without specific prior written permission.
	42	*
	43	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	44	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	45	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	46	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	47	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	48	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	49	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	50	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	51	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	52	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	53	* SUCH DAMAGE.
	54	*
	55	* @(#)dead_vnops.c 8.3 (Berkeley) 5/14/95
	56	*/
	57
	58	#include <sys/param.h>
	59	#include <sys/systm.h>
	60	#include <sys/time.h>
91447636	61	#include <sys/vnode_internal.h>
1c79356b A	62	#include <sys/errno.h>
	63	#include <sys/namei.h>
	64	#include <sys/buf.h>
	65	#include <vfs/vfs_support.h>
	66
	67	/*
	68	* Prototypes for dead operations on vnodes.
	69	*/
91447636 A	70	int dead_badop(void *);
	71	int dead_ebadf(void *);
	72	int dead_lookup(struct vnop_lookup_args *);
	73	#define dead_create (int ()(struct vnop_create_args ))dead_badop
	74	#define dead_mknod (int ()(struct vnop_mknod_args ))dead_badop
	75	int dead_open(struct vnop_open_args *);
	76	#define dead_close (int ()(struct vnop_close_args ))nullop
	77	#define dead_access (int ()(struct vnop_access_args ))dead_ebadf
	78	#define dead_getattr (int ()(struct vnop_getattr_args ))dead_ebadf
	79	#define dead_setattr (int ()(struct vnop_setattr_args ))dead_ebadf
	80	int dead_read(struct vnop_read_args *);
	81	int dead_write(struct vnop_write_args *);
	82	int dead_ioctl(struct vnop_ioctl_args *);
	83	int dead_select(struct vnop_select_args *);
	84	#define dead_mmap (int ()(struct vnop_mmap_args ))dead_badop
	85	#define dead_fsync (int ()(struct vnop_fsync_args ))nullop
	86	#define dead_remove (int (*)(struct vnop_remove_args ))dead_badop
	87	#define dead_link (int ()(struct vnop_link_args ))dead_badop
	88	#define dead_rename (int ()(struct vnop_rename_args ))dead_badop
	89	#define dead_mkdir (int ()(struct vnop_mkdir_args ))dead_badop
	90	#define dead_rmdir (int ()(struct vnop_rmdir_args ))dead_badop
	91	#define dead_symlink (int ()(struct vnop_symlink_args ))dead_badop
	92	#define dead_readdir (int ()(struct vnop_readdir_args ))dead_ebadf
	93	#define dead_readlink (int ()(struct vnop_readlink_args ))dead_ebadf
	94	#define dead_inactive (int ()(struct vnop_inactive_args ))nullop
	95	#define dead_reclaim (int ()(struct vnop_reclaim_args ))nullop
	96	int dead_strategy(struct vnop_strategy_args *);
	97	#define dead_pathconf (int ()(struct vnop_pathconf_args ))dead_ebadf
	98	#define dead_advlock (int ()(struct vnop_advlock_args ))dead_ebadf
	99	#define dead_bwrite (int ()(struct vnop_bwrite_args ))nullop
	100	int dead_pagein(struct vnop_pagein_args *);
	101	int dead_pageout(struct vnop_pageout_args *);
	102	int dead_blktooff(struct vnop_blktooff_args *);
	103	int dead_offtoblk(struct vnop_offtoblk_args *);
	104	int dead_blockmap(struct vnop_blockmap_args *);
1c79356b A	105
	106	#define VOPFUNC int ()(void )
	107	int (*dead_vnodeop_p)(void );
	108	struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
91447636 A	109	{ &vnop_default_desc, (VOPFUNC)vn_default_error },
	110	{ &vnop_lookup_desc, (VOPFUNC)dead_lookup }, /* lookup */
	111	{ &vnop_create_desc, (VOPFUNC)dead_create }, /* create */
	112	{ &vnop_open_desc, (VOPFUNC)dead_open }, /* open */
	113	{ &vnop_mknod_desc, (VOPFUNC)dead_mknod }, /* mknod */
	114	{ &vnop_close_desc, (VOPFUNC)dead_close }, /* close */
	115	{ &vnop_access_desc, (VOPFUNC)dead_access }, /* access */
	116	{ &vnop_getattr_desc, (VOPFUNC)dead_getattr }, /* getattr */
	117	{ &vnop_setattr_desc, (VOPFUNC)dead_setattr }, /* setattr */
	118	{ &vnop_read_desc, (VOPFUNC)dead_read }, /* read */
	119	{ &vnop_write_desc, (VOPFUNC)dead_write }, /* write */
	120	{ &vnop_ioctl_desc, (VOPFUNC)dead_ioctl }, /* ioctl */
	121	{ &vnop_select_desc, (VOPFUNC)dead_select }, /* select */
	122	{ &vnop_mmap_desc, (VOPFUNC)dead_mmap }, /* mmap */
	123	{ &vnop_fsync_desc, (VOPFUNC)dead_fsync }, /* fsync */
	124	{ &vnop_remove_desc, (VOPFUNC)dead_remove }, /* remove */
	125	{ &vnop_link_desc, (VOPFUNC)dead_link }, /* link */
	126	{ &vnop_rename_desc, (VOPFUNC)dead_rename }, /* rename */
	127	{ &vnop_mkdir_desc, (VOPFUNC)dead_mkdir }, /* mkdir */
	128	{ &vnop_rmdir_desc, (VOPFUNC)dead_rmdir }, /* rmdir */
	129	{ &vnop_symlink_desc, (VOPFUNC)dead_symlink }, /* symlink */
	130	{ &vnop_readdir_desc, (VOPFUNC)dead_readdir }, /* readdir */
	131	{ &vnop_readlink_desc, (VOPFUNC)dead_readlink }, /* readlink */
	132	{ &vnop_inactive_desc, (VOPFUNC)dead_inactive }, /* inactive */
	133	{ &vnop_reclaim_desc, (VOPFUNC)dead_reclaim }, /* reclaim */
	134	{ &vnop_strategy_desc, (VOPFUNC)dead_strategy }, /* strategy */
	135	{ &vnop_pathconf_desc, (VOPFUNC)dead_pathconf }, /* pathconf */
	136	{ &vnop_advlock_desc, (VOPFUNC)dead_advlock }, /* advlock */
	137	{ &vnop_bwrite_desc, (VOPFUNC)dead_bwrite }, /* bwrite */
	138	{ &vnop_pagein_desc, (VOPFUNC)err_pagein }, /* Pagein */
	139	{ &vnop_pageout_desc, (VOPFUNC)err_pageout }, /* Pageout */
	140	{ &vnop_copyfile_desc, (VOPFUNC)err_copyfile }, /* Copyfile */
	141	{ &vnop_blktooff_desc, (VOPFUNC)dead_blktooff }, /* blktooff */
	142	{ &vnop_offtoblk_desc, (VOPFUNC)dead_offtoblk }, /* offtoblk */
	143	{ &vnop_blockmap_desc, (VOPFUNC)dead_blockmap }, /* blockmap */
1c79356b A	144	{ (struct vnodeop_desc*)NULL, (VOPFUNC)NULL }
	145	};
	146	struct vnodeopv_desc dead_vnodeop_opv_desc =
	147	{ &dead_vnodeop_p, dead_vnodeop_entries };
	148
	149	/*
	150	* Trivial lookup routine that always fails.
	151	*/
	152	/* ARGSUSED */
	153	int
	154	dead_lookup(ap)
91447636	155	struct vnop_lookup_args /* {
1c79356b A	156	struct vnode * a_dvp;
	157	struct vnode ** a_vpp;
	158	struct componentname * a_cnp;
91447636	159	vfs_context_t a_context;
1c79356b A	160	} / ap;
	161	{
	162
	163	*ap->a_vpp = NULL;
	164	return (ENOTDIR);
	165	}
	166
	167	/*
	168	* Open always fails as if device did not exist.
	169	*/
	170	/* ARGSUSED */
	171	int
	172	dead_open(ap)
91447636	173	struct vnop_open_args /* {
1c79356b A	174	struct vnode *a_vp;
1c79356b A	175	int a_mode;
91447636	176	vfs_context_t a_context;
1c79356b A	177	} / ap;
	178	{
	179
	180	return (ENXIO);
	181	}
	182
	183	/*
	184	* Vnode op for read
	185	*/
	186	/* ARGSUSED */
	187	int
	188	dead_read(ap)
91447636	189	struct vnop_read_args /* {
1c79356b A	190	struct vnode *a_vp;
	191	struct uio *a_uio;
	192	int a_ioflag;
91447636	193	vfs_context_t a_context;
1c79356b A	194	} / ap;
	195	{
	196
	197	if (chkvnlock(ap->a_vp))
	198	panic("dead_read: lock");
	199	/*
	200	* Return EOF for character devices, EIO for others
	201	*/
	202	if (ap->a_vp->v_type != VCHR)
	203	return (EIO);
	204	return (0);
	205	}
	206
	207	/*
	208	* Vnode op for write
	209	*/
	210	/* ARGSUSED */
	211	int
	212	dead_write(ap)
91447636	213	struct vnop_write_args /* {
1c79356b A	214	struct vnode *a_vp;
	215	struct uio *a_uio;
	216	int a_ioflag;
91447636	217	vfs_context_t a_context;
1c79356b A	218	} / ap;
	219	{
	220
	221	if (chkvnlock(ap->a_vp))
	222	panic("dead_write: lock");
	223	return (EIO);
	224	}
	225
	226	/*
	227	* Device ioctl operation.
	228	*/
	229	/* ARGSUSED */
	230	int
	231	dead_ioctl(ap)
91447636	232	struct vnop_ioctl_args /* {
1c79356b A	233	struct vnode *a_vp;
	234	u_long a_command;
	235	caddr_t a_data;
	236	int a_fflag;
91447636	237	vfs_context_t a_context;
1c79356b A	238	} / ap;
	239	{
	240
	241	if (!chkvnlock(ap->a_vp))
	242	return (EBADF);
91447636	243	return (VCALL(ap->a_vp, VOFFSET(vnop_ioctl), ap));
1c79356b A	244	}
	245
	246	/* ARGSUSED */
	247	int
	248	dead_select(ap)
91447636	249	struct vnop_select_args /* {
1c79356b A	250	struct vnode *a_vp;
	251	int a_which;
	252	int a_fflags;
91447636	253	kauth_cred_t a_cred;
0b4e3aa0	254	void *a_wql;
1c79356b A	255	struct proc *a_p;
	256	} / ap;
	257	{
	258
	259	/*
	260	* Let the user find out that the descriptor is gone.
	261	*/
	262	return (1);
	263	}
	264
	265	/*
	266	* Just call the device strategy routine
	267	*/
	268	int
	269	dead_strategy(ap)
91447636	270	struct vnop_strategy_args /* {
1c79356b A	271	struct buf *a_bp;
	272	} / ap;
	273	{
	274
91447636 A	275	if (buf_vnode(ap->a_bp) == NULL \|\| !chkvnlock(buf_vnode(ap->a_bp))) {
	276	buf_seterror(ap->a_bp, EIO);
	277	buf_biodone(ap->a_bp);
1c79356b A	278	return (EIO);
1c79356b A	279	}
91447636	280	return (VNOP_STRATEGY(ap->a_bp));
1c79356b A	281	}
	282
	283	/*
	284	* Wait until the vnode has finished changing state.
	285	*/
	286	int
91447636 A	287	dead_blockmap(ap)
91447636 A	288	struct vnop_blockmap_args /* {
1c79356b A	289	struct vnode *a_vp;
	290	off_t a_foffset;
	291	size_t a_size;
91447636	292	daddr64_t *a_bpn;
1c79356b A	293	size_t *a_run;
1c79356b A	294	void *a_poff;
91447636 A	295	int flags;
91447636 A	296	vfs_context_t a_context;
1c79356b A	297	} / ap;
	298	{
	299
	300	if (!chkvnlock(ap->a_vp))
	301	return (EIO);
91447636 A	302	return (VNOP_BLOCKMAP(ap->a_vp, ap->a_foffset, ap->a_size, ap->a_bpn,
91447636 A	303	ap->a_run, ap->a_poff, ap->a_flags, ap->a_context));
1c79356b A	304	}
	305
	306	/*
	307	* Empty vnode failed operation
	308	*/
91447636	309	/* ARGSUSED */
1c79356b	310	int
91447636	311	dead_ebadf(void *dummy)
1c79356b A	312	{
	313
	314	return (EBADF);
	315	}
	316
	317	/*
	318	* Empty vnode bad operation
	319	*/
91447636	320	/* ARGSUSED */
1c79356b	321	int
91447636	322	dead_badop(void *dummy)
1c79356b A	323	{
	324
	325	panic("dead_badop called");
	326	/* NOTREACHED */
	327	}
	328
	329	/*
	330	* Empty vnode null operation
	331	*/
91447636	332	/* ARGSUSED */
1c79356b	333	int
91447636	334	dead_nullop(void *dummy)
1c79356b A	335	{
	336
	337	return (0);
	338	}
	339
	340	/*
	341	* We have to wait during times when the vnode is
	342	* in a state of change.
	343	*/
	344	int
91447636	345	chkvnlock(__unused vnode_t vp)
1c79356b	346	{
91447636	347	return (0);
1c79356b A	348	}
	349
	350
	351	/* Blktooff */
	352	int
	353	dead_blktooff(ap)
91447636	354	struct vnop_blktooff_args /* {
1c79356b	355	struct vnode *a_vp;
91447636	356	daddr64_t a_lblkno;
1c79356b A	357	off_t *a_offset;
	358	} / ap;
	359	{
	360	if (!chkvnlock(ap->a_vp))
	361	return (EIO);
	362
	363	ap->a_offset = (off_t)-1; / failure */
	364	return (0);
	365	}
	366	/* Blktooff */
	367	int
	368	dead_offtoblk(ap)
91447636	369	struct vnop_offtoblk_args /* {
1c79356b A	370	struct vnode *a_vp;
1c79356b A	371	off_t a_offset;
91447636	372	daddr64_t *a_lblkno;
1c79356b A	373	} / ap;
	374	{
	375	if (!chkvnlock(ap->a_vp))
	376	return (EIO);
	377
91447636	378	ap->a_lblkno = (daddr64_t)-1; / failure */
1c79356b A	379	return (0);
1c79356b A	380	}