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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)dead_vnops.c 8.1 (Berkeley) 6/10/93 34 * $FreeBSD: src/sys/miscfs/deadfs/dead_vnops.c,v 1.26 1999/08/28 00:46:42 peter Exp $ 35 * $DragonFly: src/sys/vfs/deadfs/dead_vnops.c,v 1.12 2005/02/15 08:32:18 joerg Exp $ 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/kernel.h> 41 #include <sys/lock.h> 42 #include <sys/vnode.h> 43 #include <sys/buf.h> 44 #include <sys/poll.h> 45 46 /* 47 * Prototypes for dead operations on vnodes. 48 */ 49 static int dead_badop (void); 50 static int dead_bmap (struct vop_bmap_args *); 51 static int dead_ioctl (struct vop_ioctl_args *); 52 static int dead_lock (struct vop_lock_args *); 53 static int dead_lookup (struct vop_lookup_args *); 54 static int dead_open (struct vop_open_args *); 55 static int dead_poll (struct vop_poll_args *); 56 static int dead_print (struct vop_print_args *); 57 static int dead_read (struct vop_read_args *); 58 static int dead_write (struct vop_write_args *); 59 60 struct vop_ops *dead_vnode_vops; 61 static struct vnodeopv_entry_desc dead_vnodeop_entries[] = { 62 { &vop_default_desc, vop_defaultop }, 63 { &vop_access_desc, vop_ebadf }, 64 { &vop_advlock_desc, vop_ebadf }, 65 { &vop_bmap_desc, (vnodeopv_entry_t) dead_bmap }, 66 { &vop_create_desc, (vnodeopv_entry_t) dead_badop }, 67 { &vop_getattr_desc, vop_ebadf }, 68 { &vop_inactive_desc, vop_null }, 69 { &vop_ioctl_desc, (vnodeopv_entry_t) dead_ioctl }, 70 { &vop_link_desc, (vnodeopv_entry_t) dead_badop }, 71 { &vop_lock_desc, (vnodeopv_entry_t) dead_lock }, 72 { &vop_lookup_desc, (vnodeopv_entry_t) dead_lookup }, 73 { &vop_mkdir_desc, (vnodeopv_entry_t) dead_badop }, 74 { &vop_mknod_desc, (vnodeopv_entry_t) dead_badop }, 75 { &vop_mmap_desc, (vnodeopv_entry_t) dead_badop }, 76 { &vop_open_desc, (vnodeopv_entry_t) dead_open }, 77 { &vop_pathconf_desc, vop_ebadf }, /* per pathconf(2) */ 78 { &vop_poll_desc, (vnodeopv_entry_t) dead_poll }, 79 { &vop_print_desc, (vnodeopv_entry_t) dead_print }, 80 { &vop_read_desc, (vnodeopv_entry_t) dead_read }, 81 { &vop_readdir_desc, vop_ebadf }, 82 { &vop_readlink_desc, vop_ebadf }, 83 { &vop_reclaim_desc, vop_null }, 84 { &vop_remove_desc, (vnodeopv_entry_t) dead_badop }, 85 { &vop_rename_desc, (vnodeopv_entry_t) dead_badop }, 86 { &vop_rmdir_desc, (vnodeopv_entry_t) dead_badop }, 87 { &vop_setattr_desc, vop_ebadf }, 88 { &vop_symlink_desc, (vnodeopv_entry_t) dead_badop }, 89 { &vop_write_desc, (vnodeopv_entry_t) dead_write }, 90 { NULL, NULL } 91 }; 92 static struct vnodeopv_desc dead_vnodeop_opv_desc = 93 { &dead_vnode_vops, dead_vnodeop_entries }; 94 95 VNODEOP_SET(dead_vnodeop_opv_desc); 96 97 /* 98 * Trivial lookup routine that always fails. 99 * 100 * dead_lookup(struct vnode *a_dvp, struct vnode **a_vpp, 101 * struct componentname *a_cnp) 102 */ 103 /* ARGSUSED */ 104 static int 105 dead_lookup(struct vop_lookup_args *ap) 106 { 107 *ap->a_vpp = NULL; 108 return (ENOTDIR); 109 } 110 111 /* 112 * Open always fails as if device did not exist. 113 * 114 * dead_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred, 115 * struct proc *a_p) 116 */ 117 /* ARGSUSED */ 118 static int 119 dead_open(struct vop_open_args *ap) 120 { 121 return (ENXIO); 122 } 123 124 /* 125 * Vnode op for read 126 * 127 * dead_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 128 * struct ucred *a_cred) 129 */ 130 /* ARGSUSED */ 131 static int 132 dead_read(struct vop_read_args *ap) 133 { 134 /* 135 * Return EOF for tty devices, EIO for others 136 */ 137 if ((ap->a_vp->v_flag & VISTTY) == 0) 138 return (EIO); 139 return (0); 140 } 141 142 /* 143 * Vnode op for write 144 * 145 * dead_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 146 * struct ucred *a_cred) 147 */ 148 /* ARGSUSED */ 149 static int 150 dead_write(struct vop_write_args *ap) 151 { 152 return (EIO); 153 } 154 155 /* 156 * Device ioctl operation. 157 * 158 * dead_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data, int a_fflag, 159 * struct ucred *a_cred, struct proc *a_p) 160 */ 161 /* ARGSUSED */ 162 static int 163 dead_ioctl(struct vop_ioctl_args *ap) 164 { 165 return (ENOTTY); 166 } 167 168 /* 169 * Wait until the vnode has finished changing state. 170 * 171 * dead_lock(struct vnode *a_vp, int a_flags, struct proc *a_p) 172 */ 173 static int 174 dead_lock(struct vop_lock_args *ap) 175 { 176 return (0); 177 } 178 179 /* 180 * Wait until the vnode has finished changing state. 181 * 182 * dead_bmap(struct vnode *a_vp, daddr_t a_bn, struct vnode **a_vpp, 183 * daddr_t *a_bnp, int *a_runp, int *a_runb) 184 */ 185 static int 186 dead_bmap(struct vop_bmap_args *ap) 187 { 188 return (EIO); 189 } 190 191 /* 192 * Print out the contents of a dead vnode. 193 * 194 * dead_print(struct vnode *a_vp) 195 */ 196 /* ARGSUSED */ 197 static int 198 dead_print(struct vop_print_args *ap) 199 { 200 printf("tag VT_NON, dead vnode\n"); 201 return (0); 202 } 203 204 /* 205 * Empty vnode bad operation 206 */ 207 static int 208 dead_badop(void) 209 { 210 panic("dead_badop called"); 211 /* NOTREACHED */ 212 } 213 214 /* 215 * Trivial poll routine that always returns POLLHUP. 216 * This is necessary so that a process which is polling a file 217 * gets notified when that file is revoke()d. 218 */ 219 static int 220 dead_poll(struct vop_poll_args *ap) 221 { 222 return (POLLHUP); 223 } 224