1 /* $NetBSD: dead_vnops.c,v 1.67 2022/10/26 23:39:43 riastradh 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)dead_vnops.c 8.2 (Berkeley) 11/21/94 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: dead_vnops.c,v 1.67 2022/10/26 23:39:43 riastradh Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/time.h> 40 #include <sys/vnode.h> 41 #include <sys/errno.h> 42 #include <sys/namei.h> 43 #include <sys/buf.h> 44 #include <sys/proc.h> 45 46 #include <miscfs/deadfs/deadfs.h> 47 #include <miscfs/genfs/genfs.h> 48 49 /* 50 * Prototypes for dead operations on vnodes. 51 */ 52 int dead_lookup(void *); 53 int dead_open(void *); 54 int dead_read(void *); 55 int dead_write(void *); 56 int dead_ioctl(void *); 57 int dead_poll(void *); 58 int dead_remove(void *); 59 int dead_link(void *); 60 int dead_rename(void *); 61 int dead_rmdir(void *); 62 int dead_inactive(void *); 63 int dead_bmap(void *); 64 int dead_strategy(void *); 65 int dead_print(void *); 66 int dead_getpages(void *); 67 int dead_putpages(void *); 68 69 int dead_default_error(void *); 70 71 int (**dead_vnodeop_p)(void *); 72 73 static const struct vnodeopv_entry_desc dead_vnodeop_entries[] = { 74 { &vop_default_desc, dead_default_error }, 75 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 76 { &vop_parsepath_desc, genfs_parsepath }, /* parsepath */ 77 { &vop_lookup_desc, dead_lookup }, /* lookup */ 78 { &vop_open_desc, dead_open }, /* open */ 79 { &vop_close_desc, genfs_nullop }, /* close */ 80 { &vop_read_desc, dead_read }, /* read */ 81 { &vop_write_desc, dead_write }, /* write */ 82 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 83 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 84 { &vop_fcntl_desc, genfs_nullop }, /* fcntl */ 85 { &vop_ioctl_desc, dead_ioctl }, /* ioctl */ 86 { &vop_poll_desc, dead_poll }, /* poll */ 87 { &vop_remove_desc, dead_remove }, /* remove */ 88 { &vop_link_desc, dead_link }, /* link */ 89 { &vop_rename_desc, dead_rename }, /* rename */ 90 { &vop_rmdir_desc, dead_rmdir }, /* rmdir */ 91 { &vop_fsync_desc, genfs_nullop }, /* fsync */ 92 { &vop_seek_desc, genfs_nullop }, /* seek */ 93 { &vop_inactive_desc, dead_inactive }, /* inactive */ 94 { &vop_reclaim_desc, genfs_nullop }, /* reclaim */ 95 { &vop_lock_desc, genfs_deadlock }, /* lock */ 96 { &vop_unlock_desc, genfs_deadunlock }, /* unlock */ 97 { &vop_bmap_desc, dead_bmap }, /* bmap */ 98 { &vop_strategy_desc, dead_strategy }, /* strategy */ 99 { &vop_print_desc, dead_print }, /* print */ 100 { &vop_islocked_desc, genfs_deadislocked }, /* islocked */ 101 { &vop_revoke_desc, genfs_nullop }, /* revoke */ 102 { &vop_getpages_desc, dead_getpages }, /* getpages */ 103 { &vop_putpages_desc, dead_putpages }, /* putpages */ 104 { NULL, NULL } 105 }; 106 const struct vnodeopv_desc dead_vnodeop_opv_desc = 107 { &dead_vnodeop_p, dead_vnodeop_entries }; 108 109 /* ARGSUSED */ 110 int 111 dead_default_error(void *v) 112 { 113 114 return EBADF; 115 } 116 117 int 118 dead_bmap(void *v) 119 { 120 struct vop_bmap_args /* { 121 struct vnode *a_vp; 122 daddr_t a_bn; 123 struct vnode **a_vpp; 124 daddr_t *a_bnp; 125 int *a_runp; 126 } */ *ap = v; 127 128 (void)ap; 129 130 return (EIO); 131 } 132 133 int 134 dead_lookup(void *v) 135 { 136 struct vop_lookup_v2_args /* { 137 struct vnode *a_dvp; 138 struct vnode **a_vpp; 139 struct componentname *a_cnp; 140 } */ *ap = v; 141 142 *(ap->a_vpp) = NULL; 143 144 return ENOENT; 145 } 146 147 int 148 dead_open(void *v) 149 { 150 struct vop_open_args /* { 151 struct vnode *a_vp; 152 int a_mode; 153 kauth_cred_t a_cred; 154 } */ *ap = v; 155 156 (void)ap; 157 158 return (ENXIO); 159 } 160 161 int 162 dead_read(void *v) 163 { 164 struct vop_read_args /* { 165 struct vnode *a_vp; 166 struct uio *a_uio; 167 int a_ioflag; 168 kauth_cred_t a_cred; 169 } */ *ap = v; 170 171 /* 172 * Return EOF for tty devices, EIO for others 173 */ 174 if ((ap->a_vp->v_vflag & VV_ISTTY) == 0) 175 return (EIO); 176 return (0); 177 } 178 179 int 180 dead_write(void *v) 181 { 182 struct vop_write_args /* { 183 struct vnode *a_vp; 184 struct uio *a_uio; 185 int a_ioflag; 186 kauth_cred_t a_cred; 187 } */ *ap = v; 188 189 (void)ap; 190 191 return (EIO); 192 } 193 194 int 195 dead_ioctl(void *v) 196 { 197 struct vop_ioctl_args /* { 198 struct vnode *a_vp; 199 u_long a_command; 200 void *a_data; 201 int a_fflag; 202 kauth_cred_t a_cred; 203 struct lwp *a_l; 204 } */ *ap = v; 205 206 (void)ap; 207 208 return (EBADF); 209 } 210 211 int 212 dead_poll(void *v) 213 { 214 struct vop_poll_args /* { 215 struct vnode *a_vp; 216 int a_events; 217 struct lwp *a_l; 218 } */ *ap = v; 219 220 /* 221 * Let the user find out that the descriptor is gone. 222 */ 223 return (ap->a_events); 224 } 225 226 int 227 dead_remove(void *v) 228 { 229 struct vop_remove_v3_args /* { 230 struct vnode *a_dvp; 231 struct vnode *a_vp; 232 struct componentname *a_cnp; 233 nlink_t ctx_vp_new_nlink; 234 } */ *ap = v; 235 236 vput(ap->a_vp); 237 238 return EIO; 239 } 240 241 int 242 dead_link(void *v) 243 { 244 struct vop_link_v2_args /* { 245 struct vnode *a_dvp; 246 struct vnode *a_vp; 247 struct componentname *a_cnp; 248 } */ *ap = v; 249 250 (void)ap; 251 252 return EIO; 253 } 254 255 int 256 dead_rename(void *v) 257 { 258 struct vop_rename_args /* { 259 struct vnode *a_fdvp; 260 struct vnode *a_fvp; 261 struct componentname *a_fcnp; 262 struct vnode *a_tdvp; 263 struct vnode *a_tvp; 264 struct componentname *a_tcnp; 265 } */ *ap = v; 266 267 vrele(ap->a_fdvp); 268 vrele(ap->a_fvp); 269 if (ap->a_tvp != NULL && ap->a_tvp != ap->a_tdvp) 270 VOP_UNLOCK(ap->a_tvp); 271 vput(ap->a_tdvp); 272 if (ap->a_tvp != NULL) 273 vrele(ap->a_tvp); 274 275 return EIO; 276 } 277 278 int 279 dead_rmdir(void *v) 280 { 281 struct vop_rmdir_v2_args /* { 282 struct vnode *a_dvp; 283 struct vnode *a_vp; 284 struct componentname *a_cnp; 285 } */ *ap = v; 286 287 vput(ap->a_vp); 288 289 return EIO; 290 } 291 292 int 293 dead_inactive(void *v) 294 { 295 struct vop_inactive_v2_args /* { 296 struct vnode *a_vp; 297 bool *a_recycle; 298 } */ *ap = v; 299 300 *ap->a_recycle = false; 301 302 return 0; 303 } 304 305 int 306 dead_strategy(void *v) 307 { 308 struct vop_strategy_args /* { 309 struct vnode *a_vp; 310 struct buf *a_bp; 311 } */ *ap = v; 312 struct buf *bp; 313 314 bp = ap->a_bp; 315 bp->b_error = EIO; 316 bp->b_resid = bp->b_bcount; 317 biodone(ap->a_bp); 318 return (EIO); 319 } 320 321 /* ARGSUSED */ 322 int 323 dead_print(void *v) 324 { 325 printf("tag VT_NON, dead vnode\n"); 326 return 0; 327 } 328 329 int 330 dead_getpages(void *v) 331 { 332 struct vop_getpages_args /* { 333 struct vnode *a_vp; 334 voff_t a_offset; 335 struct vm_page **a_m; 336 int *a_count; 337 int a_centeridx; 338 vm_prot_t a_access_type; 339 int a_advice; 340 int a_flags; 341 } */ *ap = v; 342 343 if ((ap->a_flags & PGO_LOCKED) == 0) 344 rw_exit(ap->a_vp->v_uobj.vmobjlock); 345 346 return (EFAULT); 347 } 348 349 int 350 dead_putpages(void *v) 351 { 352 struct vop_putpages_args /* { 353 struct vnode *a_vp; 354 voff_t a_offlo; 355 voff_t a_offhi; 356 int a_flags; 357 } */ *ap = v; 358 359 rw_exit(ap->a_vp->v_uobj.vmobjlock); 360 return (EFAULT); 361 } 362