539ef70c2d
1. Remove comment stating the blatantly obvious.
2. Align in two columns.
3. Sort all but the default element alphabetically.
4. Remove XXX comments pointing out entries not needed.
364 lines
10 KiB
C
364 lines
10 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 1.15 1997/09/14 02:57:46 peter 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/kernel.h>
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#include <sys/vnode.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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#define dead_poll vop_nopoll
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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_abortop_desc, (vop_t *) dead_abortop },
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{ &vop_access_desc, (vop_t *) dead_access },
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{ &vop_advlock_desc, (vop_t *) dead_advlock },
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{ &vop_blkatoff_desc, (vop_t *) dead_blkatoff },
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{ &vop_bmap_desc, (vop_t *) dead_bmap },
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{ &vop_bwrite_desc, (vop_t *) dead_bwrite },
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{ &vop_close_desc, (vop_t *) dead_close },
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{ &vop_create_desc, (vop_t *) dead_create },
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{ &vop_fsync_desc, (vop_t *) dead_fsync },
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{ &vop_getattr_desc, (vop_t *) dead_getattr },
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{ &vop_inactive_desc, (vop_t *) dead_inactive },
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{ &vop_ioctl_desc, (vop_t *) dead_ioctl },
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{ &vop_islocked_desc, (vop_t *) dead_islocked },
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{ &vop_link_desc, (vop_t *) dead_link },
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{ &vop_lock_desc, (vop_t *) dead_lock },
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{ &vop_lookup_desc, (vop_t *) dead_lookup },
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{ &vop_mkdir_desc, (vop_t *) dead_mkdir },
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{ &vop_mknod_desc, (vop_t *) dead_mknod },
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{ &vop_mmap_desc, (vop_t *) dead_mmap },
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{ &vop_open_desc, (vop_t *) dead_open },
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{ &vop_pathconf_desc, (vop_t *) dead_pathconf },
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{ &vop_poll_desc, (vop_t *) dead_poll },
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{ &vop_print_desc, (vop_t *) dead_print },
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{ &vop_read_desc, (vop_t *) dead_read },
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{ &vop_readdir_desc, (vop_t *) dead_readdir },
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{ &vop_readlink_desc, (vop_t *) dead_readlink },
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{ &vop_reclaim_desc, (vop_t *) dead_reclaim },
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{ &vop_remove_desc, (vop_t *) dead_remove },
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{ &vop_rename_desc, (vop_t *) dead_rename },
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{ &vop_rmdir_desc, (vop_t *) dead_rmdir },
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{ &vop_seek_desc, (vop_t *) dead_seek },
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{ &vop_setattr_desc, (vop_t *) dead_setattr },
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{ &vop_strategy_desc, (vop_t *) dead_strategy },
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{ &vop_symlink_desc, (vop_t *) dead_symlink },
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{ &vop_truncate_desc, (vop_t *) dead_truncate },
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{ &vop_unlock_desc, (vop_t *) dead_unlock },
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{ &vop_update_desc, (vop_t *) dead_update },
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{ &vop_valloc_desc, (vop_t *) dead_valloc },
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{ &vop_vfree_desc, (vop_t *) dead_vfree },
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{ &vop_write_desc, (vop_t *) dead_write },
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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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/*
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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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