f57e65478d
it 1138 times (:-() in casts and a few more times in declarations. This change is null for the i386. The type has to be `typedef int vop_t(void *)' and not `typedef int vop_t()' because `gcc -Wstrict-prototypes' warns about the latter. Since vnode op functions are called with args of different (struct pointer) types, neither of these function types is any use for type checking of the arg, so it would be preferable not to use the complete function type, especially since using the complete type requires adding 1138 casts to avoid compiler warnings and another 40+ casts to reverse the function pointer conversions before calling the functions.
376 lines
11 KiB
C
376 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: dead_vnops.c,v 1.7 1995/09/04 00:20:26 dyson Exp $
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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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int dead_badop(),
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dead_ebadf();
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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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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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int dead_read __P((struct vop_read_args *));
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int dead_write __P((struct vop_write_args *));
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int dead_ioctl __P((struct vop_ioctl_args *));
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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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int dead_lock __P((struct vop_lock_args *));
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#define dead_unlock ((int (*) __P((struct vop_unlock_args *)))nullop)
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int dead_bmap __P((struct vop_bmap_args *));
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int dead_strategy __P((struct vop_strategy_args *));
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int dead_print __P((struct vop_print_args *));
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#define dead_islocked ((int (*) __P((struct vop_islocked_args *)))nullop)
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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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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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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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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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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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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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/*
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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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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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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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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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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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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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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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} */ *ap;
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{
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if (!chkvnlock(ap->a_vp))
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return (0);
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return (VCALL(ap->a_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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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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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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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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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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* Empty vnode null operation
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*/
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int
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dead_nullop()
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{
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return (0);
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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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