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_bmap_t dead_bmap; 45 static vop_ioctl_t dead_ioctl; 46 static vop_lookup_t dead_lookup; 47 static vop_open_t dead_open; 48 static vop_poll_t dead_poll; 49 static vop_read_t dead_read; 50 static vop_write_t dead_write; 51 static vop_getwritemount_t dead_getwritemount; 52 static vop_rename_t dead_rename; 53 54 struct vop_vector dead_vnodeops = { 55 .vop_default = &default_vnodeops, 56 57 .vop_access = VOP_EBADF, 58 .vop_advlock = VOP_EBADF, 59 .vop_bmap = dead_bmap, 60 .vop_create = VOP_PANIC, 61 .vop_getattr = VOP_EBADF, 62 .vop_getwritemount = dead_getwritemount, 63 .vop_inactive = VOP_NULL, 64 .vop_ioctl = dead_ioctl, 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_write = dead_write, 83 }; 84 85 /* ARGSUSED */ 86 static int 87 dead_getwritemount(ap) 88 struct vop_getwritemount_args /* { 89 struct vnode *a_vp; 90 struct mount **a_mpp; 91 } */ *ap; 92 { 93 *(ap->a_mpp) = NULL; 94 return (0); 95 } 96 97 /* 98 * Trivial lookup routine that always fails. 99 */ 100 /* ARGSUSED */ 101 static int 102 dead_lookup(ap) 103 struct vop_lookup_args /* { 104 struct vnode * a_dvp; 105 struct vnode ** a_vpp; 106 struct componentname * a_cnp; 107 } */ *ap; 108 { 109 110 *ap->a_vpp = NULL; 111 return (ENOTDIR); 112 } 113 114 /* 115 * Open always fails as if device did not exist. 116 */ 117 /* ARGSUSED */ 118 static int 119 dead_open(ap) 120 struct vop_open_args /* { 121 struct vnode *a_vp; 122 int a_mode; 123 struct ucred *a_cred; 124 struct proc *a_p; 125 } */ *ap; 126 { 127 128 return (ENXIO); 129 } 130 131 /* 132 * Vnode op for read 133 */ 134 /* ARGSUSED */ 135 static int 136 dead_read(ap) 137 struct vop_read_args /* { 138 struct vnode *a_vp; 139 struct uio *a_uio; 140 int a_ioflag; 141 struct ucred *a_cred; 142 } */ *ap; 143 { 144 /* 145 * Return EOF for tty devices, EIO for others 146 */ 147 if ((ap->a_vp->v_vflag & VV_ISTTY) == 0) 148 return (EIO); 149 return (0); 150 } 151 152 /* 153 * Vnode op for write 154 */ 155 /* ARGSUSED */ 156 static int 157 dead_write(ap) 158 struct vop_write_args /* { 159 struct vnode *a_vp; 160 struct uio *a_uio; 161 int a_ioflag; 162 struct ucred *a_cred; 163 } */ *ap; 164 { 165 return (EIO); 166 } 167 168 /* 169 * Device ioctl operation. 170 */ 171 /* ARGSUSED */ 172 static int 173 dead_ioctl(ap) 174 struct vop_ioctl_args /* { 175 struct vnode *a_vp; 176 u_long a_command; 177 caddr_t a_data; 178 int a_fflag; 179 struct ucred *a_cred; 180 struct proc *a_p; 181 } */ *ap; 182 { 183 /* XXX: Doesn't this just recurse back here ? */ 184 return (VOP_IOCTL_AP(ap)); 185 } 186 187 /* 188 * Wait until the vnode has finished changing state. 189 */ 190 static int 191 dead_bmap(ap) 192 struct vop_bmap_args /* { 193 struct vnode *a_vp; 194 daddr_t a_bn; 195 struct bufobj **a_bop; 196 daddr_t *a_bnp; 197 int *a_runp; 198 int *a_runb; 199 } */ *ap; 200 { 201 202 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_bop, ap->a_bnp, ap->a_runp, ap->a_runb)); 203 } 204 205 /* 206 * Trivial poll routine that always returns POLLHUP. 207 * This is necessary so that a process which is polling a file 208 * gets notified when that file is revoke()d. 209 */ 210 static int 211 dead_poll(ap) 212 struct vop_poll_args *ap; 213 { 214 return (POLLHUP); 215 } 216 217 static int 218 dead_rename(ap) 219 struct vop_rename_args /* { 220 struct vnode *a_fdvp; 221 struct vnode *a_fvp; 222 struct componentname *a_fcnp; 223 struct vnode *a_tdvp; 224 struct vnode *a_tvp; 225 struct componentname *a_tcnp; 226 } */ *ap; 227 { 228 229 vop_rename_fail(ap); 230 return (EXDEV); 231 } 232