375 lines
10 KiB
C
375 lines
10 KiB
C
/*
|
|
* 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 8.1 (Berkeley) 6/10/93
|
|
* $Id: dead_vnops.c,v 1.5 1994/10/06 21:06:40 davidg Exp $
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/time.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/buf.h>
|
|
|
|
static int chkvnlock __P((struct vnode *));
|
|
/*
|
|
* 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_vnodeop_p)();
|
|
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 */
|
|
{ &vop_ioctl_desc, dead_ioctl }, /* ioctl */
|
|
{ &vop_select_desc, dead_select }, /* select */
|
|
{ &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 */
|
|
{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
|
|
};
|
|
struct vnodeopv_desc dead_vnodeop_opv_desc =
|
|
{ &dead_vnodeop_p, dead_vnodeop_entries };
|
|
|
|
VNODEOP_SET(dead_vnodeop_opv_desc);
|
|
|
|
/*
|
|
* 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;
|
|
int 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;
|
|
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;
|
|
{
|
|
|
|
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));
|
|
}
|
|
|
|
/*
|
|
* 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");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
(void) tsleep((caddr_t)vp, PINOD, "ckvnlk", 0);
|
|
locked = 1;
|
|
}
|
|
return (locked);
|
|
}
|