| 1 | /* $NetBSD: dead_vnops.c,v 1.59 2015/04/20 23:30:58 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 1.59 2015/04/20 23:30:58 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/genfs/genfs.h> |
| 47 | |
| 48 | /* |
| 49 | * Prototypes for dead operations on vnodes. |
| 50 | */ |
| 51 | #define dead_bwrite genfs_nullop |
| 52 | int dead_lookup(void *); |
| 53 | int dead_open(void *); |
| 54 | #define dead_close genfs_nullop |
| 55 | int dead_read(void *); |
| 56 | int dead_write(void *); |
| 57 | #define dead_fcntl genfs_nullop |
| 58 | int dead_ioctl(void *); |
| 59 | int dead_poll(void *); |
| 60 | int dead_remove(void *); |
| 61 | int dead_link(void *); |
| 62 | int dead_rename(void *); |
| 63 | int dead_rmdir(void *); |
| 64 | #define dead_fsync genfs_nullop |
| 65 | #define dead_seek genfs_nullop |
| 66 | int dead_inactive(void *); |
| 67 | #define dead_reclaim genfs_nullop |
| 68 | #define dead_lock genfs_deadlock |
| 69 | #define dead_unlock genfs_deadunlock |
| 70 | int dead_bmap(void *); |
| 71 | int dead_strategy(void *); |
| 72 | int dead_print(void *); |
| 73 | #define dead_islocked genfs_deadislocked |
| 74 | #define dead_revoke genfs_nullop |
| 75 | int dead_getpages(void *); |
| 76 | int dead_putpages(void *); |
| 77 | |
| 78 | int dead_default_error(void *); |
| 79 | |
| 80 | int (**dead_vnodeop_p)(void *); |
| 81 | |
| 82 | const struct vnodeopv_entry_desc dead_vnodeop_entries[] = { |
| 83 | { &vop_default_desc, dead_default_error }, |
| 84 | { &vop_bwrite_desc, dead_bwrite }, /* bwrite */ |
| 85 | { &vop_lookup_desc, dead_lookup }, /* lookup */ |
| 86 | { &vop_open_desc, dead_open }, /* open */ |
| 87 | { &vop_close_desc, dead_close }, /* close */ |
| 88 | { &vop_read_desc, dead_read }, /* read */ |
| 89 | { &vop_write_desc, dead_write }, /* write */ |
| 90 | { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ |
| 91 | { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ |
| 92 | { &vop_fcntl_desc, dead_fcntl }, /* fcntl */ |
| 93 | { &vop_ioctl_desc, dead_ioctl }, /* ioctl */ |
| 94 | { &vop_poll_desc, dead_poll }, /* poll */ |
| 95 | { &vop_remove_desc, dead_remove }, /* remove */ |
| 96 | { &vop_link_desc, dead_link }, /* link */ |
| 97 | { &vop_rename_desc, dead_rename }, /* rename */ |
| 98 | { &vop_rmdir_desc, dead_rmdir }, /* rmdir */ |
| 99 | { &vop_fsync_desc, dead_fsync }, /* fsync */ |
| 100 | { &vop_seek_desc, dead_seek }, /* seek */ |
| 101 | { &vop_inactive_desc, dead_inactive }, /* inactive */ |
| 102 | { &vop_reclaim_desc, dead_reclaim }, /* reclaim */ |
| 103 | { &vop_lock_desc, dead_lock }, /* lock */ |
| 104 | { &vop_unlock_desc, dead_unlock }, /* unlock */ |
| 105 | { &vop_bmap_desc, dead_bmap }, /* bmap */ |
| 106 | { &vop_strategy_desc, dead_strategy }, /* strategy */ |
| 107 | { &vop_print_desc, dead_print }, /* print */ |
| 108 | { &vop_islocked_desc, dead_islocked }, /* islocked */ |
| 109 | { &vop_revoke_desc, dead_revoke }, /* revoke */ |
| 110 | { &vop_getpages_desc, dead_getpages }, /* getpages */ |
| 111 | { &vop_putpages_desc, dead_putpages }, /* putpages */ |
| 112 | { NULL, NULL } |
| 113 | }; |
| 114 | const struct vnodeopv_desc dead_vnodeop_opv_desc = |
| 115 | { &dead_vnodeop_p, dead_vnodeop_entries }; |
| 116 | |
| 117 | /* ARGSUSED */ |
| 118 | int |
| 119 | dead_default_error(void *v) |
| 120 | { |
| 121 | |
| 122 | return EBADF; |
| 123 | } |
| 124 | |
| 125 | int |
| 126 | dead_bmap(void *v) |
| 127 | { |
| 128 | struct vop_bmap_args /* { |
| 129 | struct vnode *a_vp; |
| 130 | daddr_t a_bn; |
| 131 | struct vnode **a_vpp; |
| 132 | daddr_t *a_bnp; |
| 133 | int *a_runp; |
| 134 | } */ *ap = v; |
| 135 | |
| 136 | (void)ap; |
| 137 | |
| 138 | return (EIO); |
| 139 | } |
| 140 | |
| 141 | int |
| 142 | dead_lookup(void *v) |
| 143 | { |
| 144 | struct vop_lookup_v2_args /* { |
| 145 | struct vnode *a_dvp; |
| 146 | struct vnode **a_vpp; |
| 147 | struct componentname *a_cnp; |
| 148 | } */ *ap = v; |
| 149 | |
| 150 | *(ap->a_vpp) = NULL; |
| 151 | |
| 152 | return ENOENT; |
| 153 | } |
| 154 | |
| 155 | int |
| 156 | dead_open(void *v) |
| 157 | { |
| 158 | struct vop_open_args /* { |
| 159 | struct vnode *a_vp; |
| 160 | int a_mode; |
| 161 | kauth_cred_t a_cred; |
| 162 | } */ *ap = v; |
| 163 | |
| 164 | (void)ap; |
| 165 | |
| 166 | return (ENXIO); |
| 167 | } |
| 168 | |
| 169 | int |
| 170 | dead_read(void *v) |
| 171 | { |
| 172 | struct vop_read_args /* { |
| 173 | struct vnode *a_vp; |
| 174 | struct uio *a_uio; |
| 175 | int a_ioflag; |
| 176 | kauth_cred_t a_cred; |
| 177 | } */ *ap = v; |
| 178 | |
| 179 | /* |
| 180 | * Return EOF for tty devices, EIO for others |
| 181 | */ |
| 182 | if ((ap->a_vp->v_vflag & VV_ISTTY) == 0) |
| 183 | return (EIO); |
| 184 | return (0); |
| 185 | } |
| 186 | |
| 187 | int |
| 188 | dead_write(void *v) |
| 189 | { |
| 190 | struct vop_write_args /* { |
| 191 | struct vnode *a_vp; |
| 192 | struct uio *a_uio; |
| 193 | int a_ioflag; |
| 194 | kauth_cred_t a_cred; |
| 195 | } */ *ap = v; |
| 196 | |
| 197 | (void)ap; |
| 198 | |
| 199 | return (EIO); |
| 200 | } |
| 201 | |
| 202 | int |
| 203 | dead_ioctl(void *v) |
| 204 | { |
| 205 | struct vop_ioctl_args /* { |
| 206 | struct vnode *a_vp; |
| 207 | u_long a_command; |
| 208 | void *a_data; |
| 209 | int a_fflag; |
| 210 | kauth_cred_t a_cred; |
| 211 | struct lwp *a_l; |
| 212 | } */ *ap = v; |
| 213 | |
| 214 | (void)ap; |
| 215 | |
| 216 | return (EBADF); |
| 217 | } |
| 218 | |
| 219 | int |
| 220 | dead_poll(void *v) |
| 221 | { |
| 222 | struct vop_poll_args /* { |
| 223 | struct vnode *a_vp; |
| 224 | int a_events; |
| 225 | struct lwp *a_l; |
| 226 | } */ *ap = v; |
| 227 | |
| 228 | /* |
| 229 | * Let the user find out that the descriptor is gone. |
| 230 | */ |
| 231 | return (ap->a_events); |
| 232 | } |
| 233 | |
| 234 | int |
| 235 | dead_remove(void *v) |
| 236 | { |
| 237 | struct vop_remove_args /* { |
| 238 | struct vnode *a_dvp; |
| 239 | struct vnode *a_vp; |
| 240 | struct componentname *a_cnp; |
| 241 | } */ *ap = v; |
| 242 | |
| 243 | vput(ap->a_dvp); |
| 244 | vput(ap->a_vp); |
| 245 | |
| 246 | return EIO; |
| 247 | } |
| 248 | |
| 249 | int |
| 250 | dead_link(void *v) |
| 251 | { |
| 252 | struct vop_link_v2_args /* { |
| 253 | struct vnode *a_dvp; |
| 254 | struct vnode *a_vp; |
| 255 | struct componentname *a_cnp; |
| 256 | } */ *ap = v; |
| 257 | |
| 258 | (void)ap; |
| 259 | |
| 260 | return EIO; |
| 261 | } |
| 262 | |
| 263 | int |
| 264 | dead_rename(void *v) |
| 265 | { |
| 266 | struct vop_rename_args /* { |
| 267 | struct vnode *a_fdvp; |
| 268 | struct vnode *a_fvp; |
| 269 | struct componentname *a_fcnp; |
| 270 | struct vnode *a_tdvp; |
| 271 | struct vnode *a_tvp; |
| 272 | struct componentname *a_tcnp; |
| 273 | } */ *ap = v; |
| 274 | |
| 275 | vrele(ap->a_fdvp); |
| 276 | vrele(ap->a_fvp); |
| 277 | if (ap->a_tvp != NULL && ap->a_tvp != ap->a_tdvp) |
| 278 | VOP_UNLOCK(ap->a_tvp); |
| 279 | vput(ap->a_tdvp); |
| 280 | if (ap->a_tvp != NULL) |
| 281 | vrele(ap->a_tvp); |
| 282 | |
| 283 | return EIO; |
| 284 | } |
| 285 | |
| 286 | int |
| 287 | dead_rmdir(void *v) |
| 288 | { |
| 289 | struct vop_rmdir_args /* { |
| 290 | struct vnode *a_dvp; |
| 291 | struct vnode *a_vp; |
| 292 | struct componentname *a_cnp; |
| 293 | } */ *ap = v; |
| 294 | |
| 295 | vput(ap->a_dvp); |
| 296 | vput(ap->a_vp); |
| 297 | |
| 298 | return EIO; |
| 299 | } |
| 300 | |
| 301 | int |
| 302 | dead_inactive(void *v) |
| 303 | { |
| 304 | struct vop_inactive_args /* { |
| 305 | struct vnode *a_vp; |
| 306 | bool *a_recycle; |
| 307 | } */ *ap = v; |
| 308 | |
| 309 | *ap->a_recycle = false; |
| 310 | VOP_UNLOCK(ap->a_vp); |
| 311 | |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | int |
| 316 | dead_strategy(void *v) |
| 317 | { |
| 318 | struct vop_strategy_args /* { |
| 319 | struct vnode *a_vp; |
| 320 | struct buf *a_bp; |
| 321 | } */ *ap = v; |
| 322 | struct buf *bp; |
| 323 | |
| 324 | bp = ap->a_bp; |
| 325 | bp->b_error = EIO; |
| 326 | bp->b_resid = bp->b_bcount; |
| 327 | biodone(ap->a_bp); |
| 328 | return (EIO); |
| 329 | } |
| 330 | |
| 331 | /* ARGSUSED */ |
| 332 | int |
| 333 | dead_print(void *v) |
| 334 | { |
| 335 | printf("tag VT_NON, dead vnode\n" ); |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | int |
| 340 | dead_getpages(void *v) |
| 341 | { |
| 342 | struct vop_getpages_args /* { |
| 343 | struct vnode *a_vp; |
| 344 | voff_t a_offset; |
| 345 | struct vm_page **a_m; |
| 346 | int *a_count; |
| 347 | int a_centeridx; |
| 348 | vm_prot_t a_access_type; |
| 349 | int a_advice; |
| 350 | int a_flags; |
| 351 | } */ *ap = v; |
| 352 | |
| 353 | if ((ap->a_flags & PGO_LOCKED) == 0) |
| 354 | mutex_exit(ap->a_vp->v_interlock); |
| 355 | |
| 356 | return (EFAULT); |
| 357 | } |
| 358 | |
| 359 | int |
| 360 | dead_putpages(void *v) |
| 361 | { |
| 362 | struct vop_putpages_args /* { |
| 363 | struct vnode *a_vp; |
| 364 | voff_t a_offlo; |
| 365 | voff_t a_offhi; |
| 366 | int a_flags; |
| 367 | } */ *ap = v; |
| 368 | |
| 369 | mutex_exit(ap->a_vp->v_interlock); |
| 370 | return (EFAULT); |
| 371 | } |
| 372 | |