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