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_close_t dead_close; 49 static vop_getwritemount_t dead_getwritemount; 50 static vop_rename_t dead_rename; 51 static vop_unset_text_t dead_unset_text; 52 53 struct vop_vector dead_vnodeops = { 54 .vop_default = &default_vnodeops, 55 56 .vop_access = VOP_EBADF, 57 .vop_advlock = VOP_EBADF, 58 .vop_bmap = VOP_EBADF, 59 .vop_close = dead_close, 60 .vop_create = VOP_PANIC, 61 .vop_getattr = VOP_EBADF, 62 .vop_getwritemount = dead_getwritemount, 63 .vop_inactive = VOP_NULL, 64 .vop_ioctl = VOP_EBADF, 65 .vop_link = VOP_PANIC, 66 .vop_lookup = dead_lookup, 67 .vop_mkdir = VOP_PANIC, 68 .vop_mknod = VOP_PANIC, 69 .vop_open = dead_open, 70 .vop_pathconf = VOP_EBADF, /* per pathconf(2) */ 71 .vop_poll = dead_poll, 72 .vop_read = dead_read, 73 .vop_readdir = VOP_EBADF, 74 .vop_readlink = VOP_EBADF, 75 .vop_reclaim = VOP_NULL, 76 .vop_remove = VOP_PANIC, 77 .vop_rename = dead_rename, 78 .vop_rmdir = VOP_PANIC, 79 .vop_setattr = VOP_EBADF, 80 .vop_symlink = VOP_PANIC, 81 .vop_vptocnp = VOP_EBADF, 82 .vop_unset_text = dead_unset_text, 83 .vop_write = dead_write, 84 .vop_fplookup_vexec = VOP_EOPNOTSUPP, 85 .vop_fplookup_symlink = VOP_EOPNOTSUPP, 86 }; 87 VFS_VOP_VECTOR_REGISTER(dead_vnodeops); 88 89 static int 90 dead_getwritemount(struct vop_getwritemount_args *ap) 91 { 92 93 *(ap->a_mpp) = NULL; 94 return (0); 95 } 96 97 /* 98 * Trivial lookup routine that always fails. 99 */ 100 static int 101 dead_lookup(struct vop_lookup_args *ap) 102 { 103 104 *ap->a_vpp = NULL; 105 return (ENOTDIR); 106 } 107 108 /* 109 * Silently succeed open and close. 110 */ 111 static int 112 dead_open(struct vop_open_args *ap) 113 { 114 return (0); 115 } 116 117 static int 118 dead_close(struct vop_close_args *ap) 119 { 120 return (0); 121 } 122 123 int 124 dead_read(struct vop_read_args *ap) 125 { 126 127 /* 128 * Return EOF for tty devices, EIO for others 129 */ 130 if ((ap->a_vp->v_vflag & VV_ISTTY) == 0) 131 return (EIO); 132 return (0); 133 } 134 135 int 136 dead_write(struct vop_write_args *ap) 137 { 138 139 return (EIO); 140 } 141 142 int 143 dead_poll(struct vop_poll_args *ap) 144 { 145 146 if (ap->a_events & ~POLLSTANDARD) 147 return (POLLNVAL); 148 149 /* 150 * Let the user find out that the descriptor is gone. 151 */ 152 return (POLLHUP | ((POLLIN | POLLRDNORM) & ap->a_events)); 153 154 } 155 156 static int 157 dead_rename(struct vop_rename_args *ap) 158 { 159 160 vop_rename_fail(ap); 161 return (EXDEV); 162 } 163 164 static int 165 dead_unset_text(struct vop_unset_text_args *ap) 166 { 167 168 return (0); 169 } 170