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_write = dead_write, 82 }; 83 84 /* ARGSUSED */ 85 static int 86 dead_getwritemount(ap) 87 struct vop_getwritemount_args /* { 88 struct vnode *a_vp; 89 struct mount **a_mpp; 90 } */ *ap; 91 { 92 *(ap->a_mpp) = NULL; 93 return (0); 94 } 95 96 /* 97 * Trivial lookup routine that always fails. 98 */ 99 /* ARGSUSED */ 100 static int 101 dead_lookup(ap) 102 struct vop_lookup_args /* { 103 struct vnode * a_dvp; 104 struct vnode ** a_vpp; 105 struct componentname * a_cnp; 106 } */ *ap; 107 { 108 109 *ap->a_vpp = NULL; 110 return (ENOTDIR); 111 } 112 113 /* 114 * Open always fails as if device did not exist. 115 */ 116 /* ARGSUSED */ 117 static int 118 dead_open(ap) 119 struct vop_open_args /* { 120 struct vnode *a_vp; 121 int a_mode; 122 struct ucred *a_cred; 123 struct proc *a_p; 124 } */ *ap; 125 { 126 127 return (ENXIO); 128 } 129 130 /* 131 * Vnode op for read 132 */ 133 /* ARGSUSED */ 134 static int 135 dead_read(ap) 136 struct vop_read_args /* { 137 struct vnode *a_vp; 138 struct uio *a_uio; 139 int a_ioflag; 140 struct ucred *a_cred; 141 } */ *ap; 142 { 143 /* 144 * Return EOF for tty devices, EIO for others 145 */ 146 if ((ap->a_vp->v_vflag & VV_ISTTY) == 0) 147 return (EIO); 148 return (0); 149 } 150 151 /* 152 * Vnode op for write 153 */ 154 /* ARGSUSED */ 155 static int 156 dead_write(ap) 157 struct vop_write_args /* { 158 struct vnode *a_vp; 159 struct uio *a_uio; 160 int a_ioflag; 161 struct ucred *a_cred; 162 } */ *ap; 163 { 164 return (EIO); 165 } 166 167 /* 168 * Device ioctl operation. 169 */ 170 /* ARGSUSED */ 171 static int 172 dead_ioctl(ap) 173 struct vop_ioctl_args /* { 174 struct vnode *a_vp; 175 u_long a_command; 176 caddr_t a_data; 177 int a_fflag; 178 struct ucred *a_cred; 179 struct proc *a_p; 180 } */ *ap; 181 { 182 /* XXX: Doesn't this just recurse back here ? */ 183 return (VOP_IOCTL_AP(ap)); 184 } 185 186 /* 187 * Wait until the vnode has finished changing state. 188 */ 189 static int 190 dead_bmap(ap) 191 struct vop_bmap_args /* { 192 struct vnode *a_vp; 193 daddr_t a_bn; 194 struct bufobj **a_bop; 195 daddr_t *a_bnp; 196 int *a_runp; 197 int *a_runb; 198 } */ *ap; 199 { 200 201 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_bop, ap->a_bnp, ap->a_runp, ap->a_runb)); 202 } 203 204 /* 205 * Trivial poll routine that always returns POLLHUP. 206 * This is necessary so that a process which is polling a file 207 * gets notified when that file is revoke()d. 208 */ 209 static int 210 dead_poll(ap) 211 struct vop_poll_args *ap; 212 { 213 return (POLLHUP); 214 } 215 216 static int 217 dead_rename(ap) 218 struct vop_rename_args /* { 219 struct vnode *a_fdvp; 220 struct vnode *a_fvp; 221 struct componentname *a_fcnp; 222 struct vnode *a_tdvp; 223 struct vnode *a_tvp; 224 struct componentname *a_tcnp; 225 } */ *ap; 226 { 227 if (ap->a_tvp) 228 vput(ap->a_tvp); 229 if (ap->a_tdvp == ap->a_tvp) 230 vrele(ap->a_tdvp); 231 else 232 vput(ap->a_tdvp); 233 vrele(ap->a_fdvp); 234 vrele(ap->a_fvp); 235 return (EXDEV); 236 } 237