386 lines
11 KiB
C
386 lines
11 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. 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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* @(#)dead_vnops.c 8.1 (Berkeley) 6/10/93
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* $Id$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/errno.h>
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#include <sys/namei.h>
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#include <sys/buf.h>
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static int chkvnlock __P((struct vnode *));
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/*
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* Prototypes for dead operations on vnodes.
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*/
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static int dead_badop __P((void));
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static int dead_ebadf __P((void));
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static int dead_lookup __P((struct vop_lookup_args *));
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#define dead_create ((int (*) __P((struct vop_create_args *)))dead_badop)
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#define dead_mknod ((int (*) __P((struct vop_mknod_args *)))dead_badop)
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static int dead_open __P((struct vop_open_args *));
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#define dead_close ((int (*) __P((struct vop_close_args *)))nullop)
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#define dead_access ((int (*) __P((struct vop_access_args *)))dead_ebadf)
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#define dead_getattr ((int (*) __P((struct vop_getattr_args *)))dead_ebadf)
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#define dead_setattr ((int (*) __P((struct vop_setattr_args *)))dead_ebadf)
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static int dead_read __P((struct vop_read_args *));
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static int dead_write __P((struct vop_write_args *));
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static int dead_ioctl __P((struct vop_ioctl_args *));
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static int dead_select __P((struct vop_select_args *));
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#define dead_mmap ((int (*) __P((struct vop_mmap_args *)))dead_badop)
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#define dead_fsync ((int (*) __P((struct vop_fsync_args *)))nullop)
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#define dead_seek ((int (*) __P((struct vop_seek_args *)))nullop)
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#define dead_remove ((int (*) __P((struct vop_remove_args *)))dead_badop)
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#define dead_link ((int (*) __P((struct vop_link_args *)))dead_badop)
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#define dead_rename ((int (*) __P((struct vop_rename_args *)))dead_badop)
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#define dead_mkdir ((int (*) __P((struct vop_mkdir_args *)))dead_badop)
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#define dead_rmdir ((int (*) __P((struct vop_rmdir_args *)))dead_badop)
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#define dead_symlink ((int (*) __P((struct vop_symlink_args *)))dead_badop)
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#define dead_readdir ((int (*) __P((struct vop_readdir_args *)))dead_ebadf)
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#define dead_readlink ((int (*) __P((struct vop_readlink_args *)))dead_ebadf)
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#define dead_abortop ((int (*) __P((struct vop_abortop_args *)))dead_badop)
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#define dead_inactive ((int (*) __P((struct vop_inactive_args *)))nullop)
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#define dead_reclaim ((int (*) __P((struct vop_reclaim_args *)))nullop)
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static int dead_lock __P((struct vop_lock_args *));
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#define dead_unlock ((int (*) __P((struct vop_unlock_args *)))vop_nounlock)
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static int dead_bmap __P((struct vop_bmap_args *));
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static int dead_strategy __P((struct vop_strategy_args *));
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static int dead_print __P((struct vop_print_args *));
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#define dead_islocked ((int(*) __P((struct vop_islocked_args *)))vop_noislocked)
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#define dead_pathconf ((int (*) __P((struct vop_pathconf_args *)))dead_ebadf)
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#define dead_advlock ((int (*) __P((struct vop_advlock_args *)))dead_ebadf)
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#define dead_blkatoff ((int (*) __P((struct vop_blkatoff_args *)))dead_badop)
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#define dead_valloc ((int (*) __P((struct vop_valloc_args *)))dead_badop)
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#define dead_vfree ((int (*) __P((struct vop_vfree_args *)))dead_badop)
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#define dead_truncate ((int (*) __P((struct vop_truncate_args *)))nullop)
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#define dead_update ((int (*) __P((struct vop_update_args *)))nullop)
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#define dead_bwrite ((int (*) __P((struct vop_bwrite_args *)))nullop)
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vop_t **dead_vnodeop_p;
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static struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
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{ &vop_default_desc, (vop_t *)vn_default_error },
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{ &vop_lookup_desc, (vop_t *)dead_lookup }, /* lookup */
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{ &vop_create_desc, (vop_t *)dead_create }, /* create */
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{ &vop_mknod_desc, (vop_t *)dead_mknod }, /* mknod */
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{ &vop_open_desc, (vop_t *)dead_open }, /* open */
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{ &vop_close_desc, (vop_t *)dead_close }, /* close */
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{ &vop_access_desc, (vop_t *)dead_access }, /* access */
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{ &vop_getattr_desc, (vop_t *)dead_getattr }, /* getattr */
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{ &vop_setattr_desc, (vop_t *)dead_setattr }, /* setattr */
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{ &vop_read_desc, (vop_t *)dead_read }, /* read */
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{ &vop_write_desc, (vop_t *)dead_write }, /* write */
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{ &vop_ioctl_desc, (vop_t *)dead_ioctl }, /* ioctl */
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{ &vop_select_desc, (vop_t *)dead_select }, /* select */
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{ &vop_mmap_desc, (vop_t *)dead_mmap }, /* mmap */
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{ &vop_fsync_desc, (vop_t *)dead_fsync }, /* fsync */
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{ &vop_seek_desc, (vop_t *)dead_seek }, /* seek */
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{ &vop_remove_desc, (vop_t *)dead_remove }, /* remove */
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{ &vop_link_desc, (vop_t *)dead_link }, /* link */
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{ &vop_rename_desc, (vop_t *)dead_rename }, /* rename */
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{ &vop_mkdir_desc, (vop_t *)dead_mkdir }, /* mkdir */
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{ &vop_rmdir_desc, (vop_t *)dead_rmdir }, /* rmdir */
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{ &vop_symlink_desc, (vop_t *)dead_symlink }, /* symlink */
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{ &vop_readdir_desc, (vop_t *)dead_readdir }, /* readdir */
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{ &vop_readlink_desc, (vop_t *)dead_readlink }, /* readlink */
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{ &vop_abortop_desc, (vop_t *)dead_abortop }, /* abortop */
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{ &vop_inactive_desc, (vop_t *)dead_inactive }, /* inactive */
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{ &vop_reclaim_desc, (vop_t *)dead_reclaim }, /* reclaim */
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{ &vop_lock_desc, (vop_t *)dead_lock }, /* lock */
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{ &vop_unlock_desc, (vop_t *)dead_unlock }, /* unlock */
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{ &vop_bmap_desc, (vop_t *)dead_bmap }, /* bmap */
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{ &vop_strategy_desc, (vop_t *)dead_strategy }, /* strategy */
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{ &vop_print_desc, (vop_t *)dead_print }, /* print */
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{ &vop_islocked_desc, (vop_t *)dead_islocked }, /* islocked */
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{ &vop_pathconf_desc, (vop_t *)dead_pathconf }, /* pathconf */
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{ &vop_advlock_desc, (vop_t *)dead_advlock }, /* advlock */
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{ &vop_blkatoff_desc, (vop_t *)dead_blkatoff }, /* blkatoff */
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{ &vop_valloc_desc, (vop_t *)dead_valloc }, /* valloc */
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{ &vop_vfree_desc, (vop_t *)dead_vfree }, /* vfree */
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{ &vop_truncate_desc, (vop_t *)dead_truncate }, /* truncate */
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{ &vop_update_desc, (vop_t *)dead_update }, /* update */
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{ &vop_bwrite_desc, (vop_t *)dead_bwrite }, /* bwrite */
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{ NULL, NULL }
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};
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static struct vnodeopv_desc dead_vnodeop_opv_desc =
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{ &dead_vnodeop_p, dead_vnodeop_entries };
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VNODEOP_SET(dead_vnodeop_opv_desc);
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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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static int
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dead_lookup(ap)
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struct vop_lookup_args /* {
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struct vnode * a_dvp;
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struct vnode ** a_vpp;
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struct componentname * a_cnp;
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} */ *ap;
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{
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*ap->a_vpp = 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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static int
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dead_open(ap)
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struct vop_open_args /* {
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struct vnode *a_vp;
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int a_mode;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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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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static int
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dead_read(ap)
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struct vop_read_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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int a_ioflag;
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struct ucred *a_cred;
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} */ *ap;
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{
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if (chkvnlock(ap->a_vp))
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panic("dead_read: lock");
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#if 0
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/* Lite2 behaviour */
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/*
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* Return EOF for tty devices, EIO for others
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*/
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if ((ap->a_vp->v_flag & VISTTY) == 0)
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return (EIO);
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#else
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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 (ap->a_vp->v_type != VCHR)
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return (EIO);
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#endif
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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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static int
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dead_write(ap)
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struct vop_write_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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int a_ioflag;
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struct ucred *a_cred;
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} */ *ap;
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{
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if (chkvnlock(ap->a_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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static int
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dead_ioctl(ap)
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struct vop_ioctl_args /* {
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struct vnode *a_vp;
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int a_command;
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caddr_t a_data;
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int a_fflag;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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if (!chkvnlock(ap->a_vp))
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return (EBADF);
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return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap));
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}
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/* ARGSUSED */
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static int
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dead_select(ap)
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struct vop_select_args /* {
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struct vnode *a_vp;
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int a_which;
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int a_fflags;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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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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static int
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dead_strategy(ap)
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struct vop_strategy_args /* {
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struct buf *a_bp;
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} */ *ap;
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{
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if (ap->a_bp->b_vp == NULL || !chkvnlock(ap->a_bp->b_vp)) {
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ap->a_bp->b_flags |= B_ERROR;
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biodone(ap->a_bp);
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return (EIO);
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}
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return (VOP_STRATEGY(ap->a_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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static int
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dead_lock(ap)
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struct vop_lock_args /* {
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struct vnode *a_vp;
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int a_flags;
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struct proc *a_p;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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/*
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* Since we are not using the lock manager, we must clear
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* the interlock here.
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*/
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if (ap->a_flags & LK_INTERLOCK) {
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simple_unlock(&vp->v_interlock);
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ap->a_flags &= ~LK_INTERLOCK;
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}
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if (!chkvnlock(vp))
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return (0);
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return (VCALL(vp, VOFFSET(vop_lock), ap));
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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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static int
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dead_bmap(ap)
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struct vop_bmap_args /* {
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struct vnode *a_vp;
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daddr_t a_bn;
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struct vnode **a_vpp;
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daddr_t *a_bnp;
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int *a_runp;
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int *a_runb;
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} */ *ap;
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{
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if (!chkvnlock(ap->a_vp))
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return (EIO);
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return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp, ap->a_runb));
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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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static int
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dead_print(ap)
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struct vop_print_args /* {
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struct vnode *a_vp;
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} */ *ap;
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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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}
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/*
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* Empty vnode failed operation
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*/
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static 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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static int
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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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* 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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(void) tsleep((caddr_t)vp, PINOD, "ckvnlk", 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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