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dead_vnops.c
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Editing: dead_vnops.c
/*- * SPDX-License-Identifier: BSD-3-Clause * * 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. 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 * $FreeBSD$ */ #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/mutex.h> #include <sys/poll.h> #include <sys/vnode.h> /* * Prototypes for dead operations on vnodes. */ static vop_lookup_t dead_lookup; static vop_open_t dead_open; static vop_close_t dead_close; static vop_getwritemount_t dead_getwritemount; static vop_rename_t dead_rename; static vop_unset_text_t dead_unset_text; struct vop_vector dead_vnodeops = { .vop_default = &default_vnodeops, .vop_access = VOP_EBADF, .vop_advlock = VOP_EBADF, .vop_bmap = VOP_EBADF, .vop_close = dead_close, .vop_create = VOP_PANIC, .vop_getattr = VOP_EBADF, .vop_getwritemount = dead_getwritemount, .vop_inactive = VOP_NULL, .vop_ioctl = VOP_EBADF, .vop_link = VOP_PANIC, .vop_lookup = dead_lookup, .vop_mkdir = VOP_PANIC, .vop_mknod = VOP_PANIC, .vop_open = dead_open, .vop_pathconf = VOP_EBADF, /* per pathconf(2) */ .vop_poll = dead_poll, .vop_read = dead_read, .vop_readdir = VOP_EBADF, .vop_readlink = VOP_EBADF, .vop_reclaim = VOP_NULL, .vop_remove = VOP_PANIC, .vop_rename = dead_rename, .vop_rmdir = VOP_PANIC, .vop_setattr = VOP_EBADF, .vop_symlink = VOP_PANIC, .vop_vptocnp = VOP_EBADF, .vop_unset_text = dead_unset_text, .vop_write = dead_write, .vop_fplookup_vexec = VOP_EOPNOTSUPP, .vop_fplookup_symlink = VOP_EAGAIN, }; VFS_VOP_VECTOR_REGISTER(dead_vnodeops); static int dead_getwritemount(struct vop_getwritemount_args *ap) { *(ap->a_mpp) = NULL; return (0); } /* * Trivial lookup routine that always fails. */ static int dead_lookup(struct vop_lookup_args *ap) { *ap->a_vpp = NULL; return (ENOTDIR); } /* * Silently succeed open and close. */ static int dead_open(struct vop_open_args *ap) { return (0); } static int dead_close(struct vop_close_args *ap) { return (0); } int dead_read(struct vop_read_args *ap) { /* * Return EOF for tty devices, EIO for others */ if ((ap->a_vp->v_vflag & VV_ISTTY) == 0) return (EIO); return (0); } int dead_write(struct vop_write_args *ap) { return (EIO); } int dead_poll(struct vop_poll_args *ap) { if (ap->a_events & ~POLLSTANDARD) return (POLLNVAL); /* * Let the user find out that the descriptor is gone. */ return (POLLHUP | ((POLLIN | POLLRDNORM) & ap->a_events)); } static int dead_rename(struct vop_rename_args *ap) { vop_rename_fail(ap); return (EXDEV); } static int dead_unset_text(struct vop_unset_text_args *ap) { return (0); }
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