1 /* $NetBSD: dead_vnops.c,v 1.31 2001/11/10 13:33:40 lukem Exp $ */ 2 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)dead_vnops.c 8.2 (Berkeley) 11/21/94 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: dead_vnops.c,v 1.31 2001/11/10 13:33:40 lukem Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/time.h> 44 #include <sys/vnode.h> 45 #include <sys/errno.h> 46 #include <sys/namei.h> 47 #include <sys/buf.h> 48 #include <sys/proc.h> 49 50 #include <miscfs/genfs/genfs.h> 51 52 /* 53 * Prototypes for dead operations on vnodes. 54 */ 55 int dead_lookup __P((void *)); 56 #define dead_create genfs_badop 57 #define dead_mknod genfs_badop 58 int dead_open __P((void *)); 59 #define dead_close genfs_nullop 60 #define dead_access genfs_ebadf 61 #define dead_getattr genfs_ebadf 62 #define dead_setattr genfs_ebadf 63 int dead_read __P((void *)); 64 int dead_write __P((void *)); 65 #define dead_lease_check genfs_nullop 66 #define dead_fcntl genfs_nullop 67 int dead_ioctl __P((void *)); 68 int dead_poll __P((void *)); 69 #define dead_mmap genfs_badop 70 #define dead_fsync genfs_nullop 71 #define dead_seek genfs_nullop 72 #define dead_remove genfs_badop 73 #define dead_link genfs_badop 74 #define dead_rename genfs_badop 75 #define dead_mkdir genfs_badop 76 #define dead_rmdir genfs_badop 77 #define dead_symlink genfs_badop 78 #define dead_readdir genfs_ebadf 79 #define dead_readlink genfs_ebadf 80 #define dead_abortop genfs_badop 81 #define dead_inactive genfs_nullop 82 #define dead_reclaim genfs_nullop 83 int dead_lock __P((void *)); 84 #define dead_unlock genfs_nullop 85 int dead_bmap __P((void *)); 86 int dead_strategy __P((void *)); 87 int dead_print __P((void *)); 88 #define dead_islocked genfs_nullop 89 #define dead_pathconf genfs_ebadf 90 #define dead_advlock genfs_ebadf 91 #define dead_blkatoff genfs_badop 92 #define dead_valloc genfs_badop 93 #define dead_vfree genfs_badop 94 #define dead_truncate genfs_nullop 95 #define dead_update genfs_nullop 96 #define dead_bwrite genfs_nullop 97 #define dead_revoke genfs_nullop 98 99 int chkvnlock __P((struct vnode *)); 100 101 int (**dead_vnodeop_p) __P((void *)); 102 103 const struct vnodeopv_entry_desc dead_vnodeop_entries[] = { 104 { &vop_default_desc, vn_default_error }, 105 { &vop_lookup_desc, dead_lookup }, /* lookup */ 106 { &vop_create_desc, dead_create }, /* create */ 107 { &vop_mknod_desc, dead_mknod }, /* mknod */ 108 { &vop_open_desc, dead_open }, /* open */ 109 { &vop_close_desc, dead_close }, /* close */ 110 { &vop_access_desc, dead_access }, /* access */ 111 { &vop_getattr_desc, dead_getattr }, /* getattr */ 112 { &vop_setattr_desc, dead_setattr }, /* setattr */ 113 { &vop_read_desc, dead_read }, /* read */ 114 { &vop_write_desc, dead_write }, /* write */ 115 { &vop_lease_desc, dead_lease_check }, /* lease */ 116 { &vop_fcntl_desc, dead_fcntl }, /* fcntl */ 117 { &vop_ioctl_desc, dead_ioctl }, /* ioctl */ 118 { &vop_poll_desc, dead_poll }, /* poll */ 119 { &vop_revoke_desc, dead_revoke }, /* revoke */ 120 { &vop_mmap_desc, dead_mmap }, /* mmap */ 121 { &vop_fsync_desc, dead_fsync }, /* fsync */ 122 { &vop_seek_desc, dead_seek }, /* seek */ 123 { &vop_remove_desc, dead_remove }, /* remove */ 124 { &vop_link_desc, dead_link }, /* link */ 125 { &vop_rename_desc, dead_rename }, /* rename */ 126 { &vop_mkdir_desc, dead_mkdir }, /* mkdir */ 127 { &vop_rmdir_desc, dead_rmdir }, /* rmdir */ 128 { &vop_symlink_desc, dead_symlink }, /* symlink */ 129 { &vop_readdir_desc, dead_readdir }, /* readdir */ 130 { &vop_readlink_desc, dead_readlink }, /* readlink */ 131 { &vop_abortop_desc, dead_abortop }, /* abortop */ 132 { &vop_inactive_desc, dead_inactive }, /* inactive */ 133 { &vop_reclaim_desc, dead_reclaim }, /* reclaim */ 134 { &vop_lock_desc, dead_lock }, /* lock */ 135 { &vop_unlock_desc, dead_unlock }, /* unlock */ 136 { &vop_bmap_desc, dead_bmap }, /* bmap */ 137 { &vop_strategy_desc, dead_strategy }, /* strategy */ 138 { &vop_print_desc, dead_print }, /* print */ 139 { &vop_islocked_desc, dead_islocked }, /* islocked */ 140 { &vop_pathconf_desc, dead_pathconf }, /* pathconf */ 141 { &vop_advlock_desc, dead_advlock }, /* advlock */ 142 { &vop_blkatoff_desc, dead_blkatoff }, /* blkatoff */ 143 { &vop_valloc_desc, dead_valloc }, /* valloc */ 144 { &vop_vfree_desc, dead_vfree }, /* vfree */ 145 { &vop_truncate_desc, dead_truncate }, /* truncate */ 146 { &vop_update_desc, dead_update }, /* update */ 147 { &vop_bwrite_desc, dead_bwrite }, /* bwrite */ 148 { (struct vnodeop_desc*)NULL, (int(*) __P((void *)))NULL } 149 }; 150 const struct vnodeopv_desc dead_vnodeop_opv_desc = 151 { &dead_vnodeop_p, dead_vnodeop_entries }; 152 153 /* 154 * Trivial lookup routine that always fails. 155 */ 156 /* ARGSUSED */ 157 int 158 dead_lookup(v) 159 void *v; 160 { 161 struct vop_lookup_args /* { 162 struct vnode * a_dvp; 163 struct vnode ** a_vpp; 164 struct componentname * a_cnp; 165 } */ *ap = v; 166 167 *ap->a_vpp = NULL; 168 return (ENOTDIR); 169 } 170 171 /* 172 * Open always fails as if device did not exist. 173 */ 174 /* ARGSUSED */ 175 int 176 dead_open(v) 177 void *v; 178 { 179 180 return (ENXIO); 181 } 182 183 /* 184 * Vnode op for read 185 */ 186 /* ARGSUSED */ 187 int 188 dead_read(v) 189 void *v; 190 { 191 struct vop_read_args /* { 192 struct vnode *a_vp; 193 struct uio *a_uio; 194 int a_ioflag; 195 struct ucred *a_cred; 196 } */ *ap = v; 197 198 if (chkvnlock(ap->a_vp)) 199 panic("dead_read: lock"); 200 /* 201 * Return EOF for tty devices, EIO for others 202 */ 203 if ((ap->a_vp->v_flag & VISTTY) == 0) 204 return (EIO); 205 return (0); 206 } 207 208 /* 209 * Vnode op for write 210 */ 211 /* ARGSUSED */ 212 int 213 dead_write(v) 214 void *v; 215 { 216 struct vop_write_args /* { 217 struct vnode *a_vp; 218 struct uio *a_uio; 219 int a_ioflag; 220 struct ucred *a_cred; 221 } */ *ap = v; 222 223 if (chkvnlock(ap->a_vp)) 224 panic("dead_write: lock"); 225 return (EIO); 226 } 227 228 /* 229 * Device ioctl operation. 230 */ 231 /* ARGSUSED */ 232 int 233 dead_ioctl(v) 234 void *v; 235 { 236 struct vop_ioctl_args /* { 237 struct vnode *a_vp; 238 u_long a_command; 239 caddr_t a_data; 240 int a_fflag; 241 struct ucred *a_cred; 242 struct proc *a_p; 243 } */ *ap = v; 244 245 if (!chkvnlock(ap->a_vp)) 246 return (EBADF); 247 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap)); 248 } 249 250 /* ARGSUSED */ 251 int 252 dead_poll(v) 253 void *v; 254 { 255 struct vop_poll_args /* { 256 struct vnode *a_vp; 257 int a_events; 258 struct proc *a_p; 259 } */ *ap = v; 260 261 /* 262 * Let the user find out that the descriptor is gone. 263 */ 264 return (ap->a_events); 265 } 266 267 /* 268 * Just call the device strategy routine 269 */ 270 int 271 dead_strategy(v) 272 void *v; 273 { 274 275 struct vop_strategy_args /* { 276 struct buf *a_bp; 277 } */ *ap = v; 278 if (ap->a_bp->b_vp == NULL || !chkvnlock(ap->a_bp->b_vp)) { 279 ap->a_bp->b_flags |= B_ERROR; 280 biodone(ap->a_bp); 281 return (EIO); 282 } 283 return (VOP_STRATEGY(ap->a_bp)); 284 } 285 286 /* 287 * Wait until the vnode has finished changing state. 288 */ 289 int 290 dead_lock(v) 291 void *v; 292 { 293 struct vop_lock_args /* { 294 struct vnode *a_vp; 295 int a_flags; 296 struct proc *a_p; 297 } */ *ap = v; 298 299 if (ap->a_flags & LK_INTERLOCK) { 300 simple_unlock(&ap->a_vp->v_interlock); 301 ap->a_flags &= ~LK_INTERLOCK; 302 } 303 if (!chkvnlock(ap->a_vp)) 304 return (0); 305 return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap)); 306 } 307 308 /* 309 * Wait until the vnode has finished changing state. 310 */ 311 int 312 dead_bmap(v) 313 void *v; 314 { 315 struct vop_bmap_args /* { 316 struct vnode *a_vp; 317 daddr_t a_bn; 318 struct vnode **a_vpp; 319 daddr_t *a_bnp; 320 int *a_runp; 321 } */ *ap = v; 322 323 if (!chkvnlock(ap->a_vp)) 324 return (EIO); 325 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp)); 326 } 327 328 /* 329 * Print out the contents of a dead vnode. 330 */ 331 /* ARGSUSED */ 332 int 333 dead_print(v) 334 void *v; 335 { 336 printf("tag VT_NON, dead vnode\n"); 337 return 0; 338 } 339 340 /* 341 * We have to wait during times when the vnode is 342 * in a state of change. 343 */ 344 int 345 chkvnlock(vp) 346 struct vnode *vp; 347 { 348 int locked = 0; 349 350 while (vp->v_flag & VXLOCK) { 351 vp->v_flag |= VXWANT; 352 (void) tsleep(vp, PINOD, "deadchk", 0); 353 locked = 1; 354 } 355 return (locked); 356 } 357