NetBSD/sys/miscfs/deadfs/dead_vnops.c

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/* $NetBSD: dead_vnops.c,v 1.32 2001/12/06 04:27:40 chs Exp $ */
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/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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 8.2 (Berkeley) 11/21/94
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*/
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#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: dead_vnops.c,v 1.32 2001/12/06 04:27:40 chs Exp $");
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#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>
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#include <sys/proc.h>
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#include <miscfs/genfs/genfs.h>
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/*
* Prototypes for dead operations on vnodes.
*/
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int dead_lookup __P((void *));
#define dead_create genfs_badop
#define dead_mknod genfs_badop
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int dead_open __P((void *));
#define dead_close genfs_nullop
#define dead_access genfs_ebadf
#define dead_getattr genfs_ebadf
#define dead_setattr genfs_ebadf
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int dead_read __P((void *));
int dead_write __P((void *));
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#define dead_lease_check genfs_nullop
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#define dead_fcntl genfs_nullop
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int dead_ioctl __P((void *));
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int dead_poll __P((void *));
#define dead_mmap genfs_badop
#define dead_fsync genfs_nullop
#define dead_seek genfs_nullop
#define dead_remove genfs_badop
#define dead_link genfs_badop
#define dead_rename genfs_badop
#define dead_mkdir genfs_badop
#define dead_rmdir genfs_badop
#define dead_symlink genfs_badop
#define dead_readdir genfs_ebadf
#define dead_readlink genfs_ebadf
#define dead_abortop genfs_badop
#define dead_inactive genfs_nullop
#define dead_reclaim genfs_nullop
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int dead_lock __P((void *));
#define dead_unlock genfs_nullop
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int dead_bmap __P((void *));
int dead_strategy __P((void *));
int dead_print __P((void *));
#define dead_islocked genfs_nullop
#define dead_pathconf genfs_ebadf
#define dead_advlock genfs_ebadf
#define dead_blkatoff genfs_badop
#define dead_valloc genfs_badop
#define dead_vfree genfs_badop
#define dead_truncate genfs_nullop
#define dead_update genfs_nullop
#define dead_bwrite genfs_nullop
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#define dead_revoke genfs_nullop
#define dead_putpages genfs_null_putpages
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int chkvnlock __P((struct vnode *));
int (**dead_vnodeop_p) __P((void *));
const struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, dead_lookup }, /* lookup */
{ &vop_create_desc, dead_create }, /* create */
{ &vop_mknod_desc, dead_mknod }, /* mknod */
{ &vop_open_desc, dead_open }, /* open */
{ &vop_close_desc, dead_close }, /* close */
{ &vop_access_desc, dead_access }, /* access */
{ &vop_getattr_desc, dead_getattr }, /* getattr */
{ &vop_setattr_desc, dead_setattr }, /* setattr */
{ &vop_read_desc, dead_read }, /* read */
{ &vop_write_desc, dead_write }, /* write */
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{ &vop_lease_desc, dead_lease_check }, /* lease */
{ &vop_fcntl_desc, dead_fcntl }, /* fcntl */
{ &vop_ioctl_desc, dead_ioctl }, /* ioctl */
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{ &vop_poll_desc, dead_poll }, /* poll */
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{ &vop_revoke_desc, dead_revoke }, /* revoke */
{ &vop_mmap_desc, dead_mmap }, /* mmap */
{ &vop_fsync_desc, dead_fsync }, /* fsync */
{ &vop_seek_desc, dead_seek }, /* seek */
{ &vop_remove_desc, dead_remove }, /* remove */
{ &vop_link_desc, dead_link }, /* link */
{ &vop_rename_desc, dead_rename }, /* rename */
{ &vop_mkdir_desc, dead_mkdir }, /* mkdir */
{ &vop_rmdir_desc, dead_rmdir }, /* rmdir */
{ &vop_symlink_desc, dead_symlink }, /* symlink */
{ &vop_readdir_desc, dead_readdir }, /* readdir */
{ &vop_readlink_desc, dead_readlink }, /* readlink */
{ &vop_abortop_desc, dead_abortop }, /* abortop */
{ &vop_inactive_desc, dead_inactive }, /* inactive */
{ &vop_reclaim_desc, dead_reclaim }, /* reclaim */
{ &vop_lock_desc, dead_lock }, /* lock */
{ &vop_unlock_desc, dead_unlock }, /* unlock */
{ &vop_bmap_desc, dead_bmap }, /* bmap */
{ &vop_strategy_desc, dead_strategy }, /* strategy */
{ &vop_print_desc, dead_print }, /* print */
{ &vop_islocked_desc, dead_islocked }, /* islocked */
{ &vop_pathconf_desc, dead_pathconf }, /* pathconf */
{ &vop_advlock_desc, dead_advlock }, /* advlock */
{ &vop_blkatoff_desc, dead_blkatoff }, /* blkatoff */
{ &vop_valloc_desc, dead_valloc }, /* valloc */
{ &vop_vfree_desc, dead_vfree }, /* vfree */
{ &vop_truncate_desc, dead_truncate }, /* truncate */
{ &vop_update_desc, dead_update }, /* update */
{ &vop_bwrite_desc, dead_bwrite }, /* bwrite */
{ &vop_putpages_desc, dead_putpages }, /* putpages */
{ NULL, NULL }
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};
const struct vnodeopv_desc dead_vnodeop_opv_desc =
{ &dead_vnodeop_p, dead_vnodeop_entries };
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/*
* Trivial lookup routine that always fails.
*/
/* ARGSUSED */
int
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dead_lookup(v)
void *v;
{
struct vop_lookup_args /* {
struct vnode * a_dvp;
struct vnode ** a_vpp;
struct componentname * a_cnp;
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} */ *ap = v;
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*ap->a_vpp = NULL;
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return (ENOTDIR);
}
/*
* Open always fails as if device did not exist.
*/
/* ARGSUSED */
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int
dead_open(v)
void *v;
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{
return (ENXIO);
}
/*
* Vnode op for read
*/
/* ARGSUSED */
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int
dead_read(v)
void *v;
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
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} */ *ap = v;
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if (chkvnlock(ap->a_vp))
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panic("dead_read: lock");
/*
* Return EOF for tty devices, EIO for others
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*/
if ((ap->a_vp->v_flag & VISTTY) == 0)
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return (EIO);
return (0);
}
/*
* Vnode op for write
*/
/* ARGSUSED */
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int
dead_write(v)
void *v;
{
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
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} */ *ap = v;
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if (chkvnlock(ap->a_vp))
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panic("dead_write: lock");
return (EIO);
}
/*
* Device ioctl operation.
*/
/* ARGSUSED */
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int
dead_ioctl(v)
void *v;
{
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;
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} */ *ap = v;
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if (!chkvnlock(ap->a_vp))
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return (EBADF);
return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap));
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}
/* ARGSUSED */
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int
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dead_poll(v)
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void *v;
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{
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struct vop_poll_args /* {
struct vnode *a_vp;
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int a_events;
struct proc *a_p;
} */ *ap = v;
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/*
* Let the user find out that the descriptor is gone.
*/
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return (ap->a_events);
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}
/*
* Just call the device strategy routine
*/
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int
dead_strategy(v)
void *v;
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{
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struct vop_strategy_args /* {
struct buf *a_bp;
} */ *ap = v;
if (ap->a_bp->b_vp == NULL || !chkvnlock(ap->a_bp->b_vp)) {
ap->a_bp->b_flags |= B_ERROR;
biodone(ap->a_bp);
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return (EIO);
}
return (VOP_STRATEGY(ap->a_bp));
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}
/*
* Wait until the vnode has finished changing state.
*/
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int
dead_lock(v)
void *v;
{
struct vop_lock_args /* {
struct vnode *a_vp;
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int a_flags;
struct proc *a_p;
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} */ *ap = v;
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if (ap->a_flags & LK_INTERLOCK) {
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simple_unlock(&ap->a_vp->v_interlock);
ap->a_flags &= ~LK_INTERLOCK;
}
if (!chkvnlock(ap->a_vp))
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return (0);
return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap));
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}
/*
* Wait until the vnode has finished changing state.
*/
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int
dead_bmap(v)
void *v;
{
struct vop_bmap_args /* {
struct vnode *a_vp;
daddr_t a_bn;
struct vnode **a_vpp;
daddr_t *a_bnp;
int *a_runp;
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} */ *ap = v;
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if (!chkvnlock(ap->a_vp))
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return (EIO);
return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp));
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}
/*
* Print out the contents of a dead vnode.
*/
/* ARGSUSED */
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int
dead_print(v)
void *v;
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{
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printf("tag VT_NON, dead vnode\n");
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return 0;
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}
/*
* We have to wait during times when the vnode is
* in a state of change.
*/
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int
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chkvnlock(vp)
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struct vnode *vp;
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{
int locked = 0;
while (vp->v_flag & VXLOCK) {
vp->v_flag |= VXWANT;
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(void) tsleep(vp, PINOD, "deadchk", 0);
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locked = 1;
}
return (locked);
}