1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)dead_vnops.c 8.1 (Berkeley) 6/10/93 32 * $FreeBSD$ 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 #include <sys/poll.h> 41 #include <sys/vnode.h> 42 43 /* 44 * Prototypes for dead operations on vnodes. 45 */ 46 static vop_lookup_t dead_lookup; 47 static vop_open_t dead_open; 48 static vop_getwritemount_t dead_getwritemount; 49 static vop_rename_t dead_rename; 50 51 struct vop_vector dead_vnodeops = { 52 .vop_default = &default_vnodeops, 53 54 .vop_access = VOP_EBADF, 55 .vop_advlock = VOP_EBADF, 56 .vop_bmap = VOP_EBADF, 57 .vop_create = VOP_PANIC, 58 .vop_getattr = VOP_EBADF, 59 .vop_getwritemount = dead_getwritemount, 60 .vop_inactive = VOP_NULL, 61 .vop_ioctl = VOP_EBADF, 62 .vop_link = VOP_PANIC, 63 .vop_lookup = dead_lookup, 64 .vop_mkdir = VOP_PANIC, 65 .vop_mknod = VOP_PANIC, 66 .vop_open = dead_open, 67 .vop_pathconf = VOP_EBADF, /* per pathconf(2) */ 68 .vop_poll = dead_poll, 69 .vop_read = dead_read, 70 .vop_readdir = VOP_EBADF, 71 .vop_readlink = VOP_EBADF, 72 .vop_reclaim = VOP_NULL, 73 .vop_remove = VOP_PANIC, 74 .vop_rename = dead_rename, 75 .vop_rmdir = VOP_PANIC, 76 .vop_setattr = VOP_EBADF, 77 .vop_symlink = VOP_PANIC, 78 .vop_vptocnp = VOP_EBADF, 79 .vop_write = dead_write, 80 }; 81 82 static int 83 dead_getwritemount(struct vop_getwritemount_args *ap) 84 { 85 86 *(ap->a_mpp) = NULL; 87 return (0); 88 } 89 90 /* 91 * Trivial lookup routine that always fails. 92 */ 93 static int 94 dead_lookup(struct vop_lookup_args *ap) 95 { 96 97 *ap->a_vpp = NULL; 98 return (ENOTDIR); 99 } 100 101 /* 102 * Open always fails as if device did not exist. 103 */ 104 static int 105 dead_open(struct vop_open_args *ap) 106 { 107 108 return (ENXIO); 109 } 110 111 int 112 dead_read(struct vop_read_args *ap) 113 { 114 115 /* 116 * Return EOF for tty devices, EIO for others 117 */ 118 if ((ap->a_vp->v_vflag & VV_ISTTY) == 0) 119 return (EIO); 120 return (0); 121 } 122 123 int 124 dead_write(struct vop_write_args *ap) 125 { 126 127 return (EIO); 128 } 129 130 int 131 dead_poll(struct vop_poll_args *ap) 132 { 133 134 if (ap->a_events & ~POLLSTANDARD) 135 return (POLLNVAL); 136 137 /* 138 * Let the user find out that the descriptor is gone. 139 */ 140 return (POLLHUP | ((POLLIN | POLLRDNORM) & ap->a_events)); 141 142 } 143 144 static int 145 dead_rename(struct vop_rename_args *ap) 146 { 147 148 vop_rename_fail(ap); 149 return (EXDEV); 150 } 151