fifo_vnops.c revision 1.78
1 /* $NetBSD: fifo_vnops.c,v 1.78 2017/04/11 14:25:00 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * Copyright (c) 1990, 1993, 1995 31 * The Regents of the University of California. All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 3. Neither the name of the University nor the names of its contributors 42 * may be used to endorse or promote products derived from this software 43 * without specific prior written permission. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 * 57 * @(#)fifo_vnops.c 8.10 (Berkeley) 5/27/95 58 */ 59 60 #include <sys/cdefs.h> 61 __KERNEL_RCSID(0, "$NetBSD: fifo_vnops.c,v 1.78 2017/04/11 14:25:00 riastradh Exp $"); 62 63 #include <sys/param.h> 64 #include <sys/systm.h> 65 #include <sys/proc.h> 66 #include <sys/time.h> 67 #include <sys/namei.h> 68 #include <sys/vnode.h> 69 #include <sys/socket.h> 70 #include <sys/protosw.h> 71 #include <sys/socketvar.h> 72 #include <sys/stat.h> 73 #include <sys/ioctl.h> 74 #include <sys/file.h> 75 #include <sys/errno.h> 76 #include <sys/kmem.h> 77 #include <sys/un.h> 78 #include <sys/poll.h> 79 #include <sys/event.h> 80 #include <sys/condvar.h> 81 82 #include <miscfs/fifofs/fifo.h> 83 #include <miscfs/genfs/genfs.h> 84 85 /* 86 * This structure is associated with the FIFO vnode and stores 87 * the state associated with the FIFO. 88 */ 89 struct fifoinfo { 90 struct socket *fi_readsock; 91 struct socket *fi_writesock; 92 kcondvar_t fi_rcv; 93 int fi_readers; 94 kcondvar_t fi_wcv; 95 int fi_writers; 96 }; 97 98 /* 99 * Trivial lookup routine that always fails. 100 */ 101 /* ARGSUSED */ 102 static int 103 fifo_lookup(void *v) 104 { 105 struct vop_lookup_v2_args /* { 106 struct vnode *a_dvp; 107 struct vnode **a_vpp; 108 struct componentname *a_cnp; 109 } */ *ap = v; 110 111 *ap->a_vpp = NULL; 112 return (ENOTDIR); 113 } 114 115 /* 116 * Open called to set up a new instance of a fifo or 117 * to find an active instance of a fifo. 118 */ 119 static int 120 fifo_open(void *v) 121 { 122 struct vop_open_args /* { 123 struct vnode *a_vp; 124 int a_mode; 125 kauth_cred_t a_cred; 126 } */ *ap = v; 127 struct lwp *l = curlwp; 128 struct vnode *vp; 129 struct fifoinfo *fip; 130 struct socket *rso, *wso; 131 int error; 132 133 vp = ap->a_vp; 134 KASSERT(VOP_ISLOCKED(vp)); 135 136 if ((fip = vp->v_fifoinfo) == NULL) { 137 fip = kmem_alloc(sizeof(*fip), KM_SLEEP); 138 error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, l, NULL); 139 if (error != 0) { 140 kmem_free(fip, sizeof(*fip)); 141 return (error); 142 } 143 fip->fi_readsock = rso; 144 error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, l, rso); 145 if (error != 0) { 146 (void)soclose(rso); 147 kmem_free(fip, sizeof(*fip)); 148 return (error); 149 } 150 fip->fi_writesock = wso; 151 solock(wso); 152 if ((error = unp_connect2(wso, rso)) != 0) { 153 sounlock(wso); 154 (void)soclose(wso); 155 (void)soclose(rso); 156 kmem_free(fip, sizeof(*fip)); 157 return (error); 158 } 159 fip->fi_readers = 0; 160 fip->fi_writers = 0; 161 wso->so_state |= SS_CANTRCVMORE; 162 rso->so_state |= SS_CANTSENDMORE; 163 cv_init(&fip->fi_rcv, "fiford"); 164 cv_init(&fip->fi_wcv, "fifowr"); 165 vp->v_fifoinfo = fip; 166 } else { 167 wso = fip->fi_writesock; 168 rso = fip->fi_readsock; 169 solock(wso); 170 } 171 172 if (ap->a_mode & FREAD) { 173 if (fip->fi_readers++ == 0) { 174 wso->so_state &= ~SS_CANTSENDMORE; 175 cv_broadcast(&fip->fi_wcv); 176 } 177 } 178 if (ap->a_mode & FWRITE) { 179 if (fip->fi_writers++ == 0) { 180 rso->so_state &= ~SS_CANTRCVMORE; 181 cv_broadcast(&fip->fi_rcv); 182 } 183 } 184 if (ap->a_mode & FREAD) { 185 if (ap->a_mode & O_NONBLOCK) { 186 } else { 187 while (!soreadable(rso) && fip->fi_writers == 0) { 188 VOP_UNLOCK(vp); 189 error = cv_wait_sig(&fip->fi_rcv, 190 wso->so_lock); 191 sounlock(wso); 192 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 193 if (error) 194 goto bad; 195 solock(wso); 196 } 197 } 198 } 199 if (ap->a_mode & FWRITE) { 200 if (ap->a_mode & O_NONBLOCK) { 201 if (fip->fi_readers == 0) { 202 error = ENXIO; 203 sounlock(wso); 204 goto bad; 205 } 206 } else { 207 while (fip->fi_readers == 0) { 208 VOP_UNLOCK(vp); 209 error = cv_wait_sig(&fip->fi_wcv, 210 wso->so_lock); 211 sounlock(wso); 212 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 213 if (error) 214 goto bad; 215 solock(wso); 216 } 217 } 218 } 219 sounlock(wso); 220 return (0); 221 bad: 222 VOP_CLOSE(vp, ap->a_mode, ap->a_cred); 223 return (error); 224 } 225 226 /* 227 * Vnode op for read 228 */ 229 /* ARGSUSED */ 230 static int 231 fifo_read(void *v) 232 { 233 struct vop_read_args /* { 234 struct vnode *a_vp; 235 struct uio *a_uio; 236 int a_ioflag; 237 kauth_cred_t a_cred; 238 } */ *ap = v; 239 struct uio *uio; 240 struct socket *rso; 241 int error, sflags; 242 size_t startresid; 243 244 uio = ap->a_uio; 245 rso = ap->a_vp->v_fifoinfo->fi_readsock; 246 #ifdef DIAGNOSTIC 247 if (uio->uio_rw != UIO_READ) 248 panic("fifo_read mode"); 249 #endif 250 if (uio->uio_resid == 0) 251 return (0); 252 startresid = uio->uio_resid; 253 VOP_UNLOCK(ap->a_vp); 254 sflags = (ap->a_ioflag & IO_NDELAY) ? MSG_NBIO : 0; 255 error = (*rso->so_receive)(rso, NULL, uio, NULL, NULL, &sflags); 256 /* 257 * Clear EOF indication after first such return. 258 */ 259 if (error == 0 && uio->uio_resid == startresid) 260 rso->so_state &= ~SS_CANTRCVMORE; 261 if (ap->a_ioflag & IO_NDELAY) { 262 if (error == EWOULDBLOCK && 263 ap->a_vp->v_fifoinfo->fi_writers == 0) 264 error = 0; 265 } 266 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY); 267 return (error); 268 } 269 270 /* 271 * Vnode op for write 272 */ 273 /* ARGSUSED */ 274 static int 275 fifo_write(void *v) 276 { 277 struct vop_write_args /* { 278 struct vnode *a_vp; 279 struct uio *a_uio; 280 int a_ioflag; 281 kauth_cred_t a_cred; 282 } */ *ap = v; 283 struct socket *wso; 284 int error, sflags; 285 286 wso = ap->a_vp->v_fifoinfo->fi_writesock; 287 #ifdef DIAGNOSTIC 288 if (ap->a_uio->uio_rw != UIO_WRITE) 289 panic("fifo_write mode"); 290 #endif 291 VOP_UNLOCK(ap->a_vp); 292 sflags = (ap->a_ioflag & IO_NDELAY) ? MSG_NBIO : 0; 293 error = (*wso->so_send)(wso, NULL, ap->a_uio, 0, NULL, sflags, curlwp); 294 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY); 295 return (error); 296 } 297 298 /* 299 * Device ioctl operation. 300 */ 301 /* ARGSUSED */ 302 static int 303 fifo_ioctl(void *v) 304 { 305 struct vop_ioctl_args /* { 306 struct vnode *a_vp; 307 u_long a_command; 308 void *a_data; 309 int a_fflag; 310 kauth_cred_t a_cred; 311 struct lwp *a_l; 312 } */ *ap = v; 313 struct file filetmp; 314 int error; 315 316 if (ap->a_command == FIONBIO) 317 return (0); 318 if (ap->a_fflag & FREAD) { 319 filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock; 320 error = soo_ioctl(&filetmp, ap->a_command, ap->a_data); 321 if (error) 322 return (error); 323 } 324 if (ap->a_fflag & FWRITE) { 325 filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock; 326 error = soo_ioctl(&filetmp, ap->a_command, ap->a_data); 327 if (error) 328 return (error); 329 } 330 return (0); 331 } 332 333 /* ARGSUSED */ 334 static int 335 fifo_poll(void *v) 336 { 337 struct vop_poll_args /* { 338 struct vnode *a_vp; 339 int a_events; 340 struct lwp *a_l; 341 } */ *ap = v; 342 struct socket *so; 343 int revents; 344 345 revents = 0; 346 if (ap->a_events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { 347 so = ap->a_vp->v_fifoinfo->fi_readsock; 348 if (so) 349 revents |= sopoll(so, ap->a_events); 350 } 351 if (ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND)) { 352 so = ap->a_vp->v_fifoinfo->fi_writesock; 353 if (so) 354 revents |= sopoll(so, ap->a_events); 355 } 356 357 return (revents); 358 } 359 360 static int 361 fifo_inactive(void *v) 362 { 363 struct vop_inactive_v2_args /* { 364 struct vnode *a_vp; 365 struct lwp *a_l; 366 } */ *ap __unused = v; 367 368 return (0); 369 } 370 371 /* 372 * This is a noop, simply returning what one has been given. 373 */ 374 static int 375 fifo_bmap(void *v) 376 { 377 struct vop_bmap_args /* { 378 struct vnode *a_vp; 379 daddr_t a_bn; 380 struct vnode **a_vpp; 381 daddr_t *a_bnp; 382 int *a_runp; 383 } */ *ap = v; 384 385 if (ap->a_vpp != NULL) 386 *ap->a_vpp = ap->a_vp; 387 if (ap->a_bnp != NULL) 388 *ap->a_bnp = ap->a_bn; 389 if (ap->a_runp != NULL) 390 *ap->a_runp = 0; 391 return (0); 392 } 393 394 /* 395 * Device close routine 396 */ 397 /* ARGSUSED */ 398 static int 399 fifo_close(void *v) 400 { 401 struct vop_close_args /* { 402 struct vnode *a_vp; 403 int a_fflag; 404 kauth_cred_t a_cred; 405 struct lwp *a_l; 406 } */ *ap = v; 407 struct vnode *vp; 408 struct fifoinfo *fip; 409 struct socket *wso, *rso; 410 int isrevoke; 411 412 vp = ap->a_vp; 413 fip = vp->v_fifoinfo; 414 isrevoke = (ap->a_fflag & (FREAD | FWRITE | FNONBLOCK)) == FNONBLOCK; 415 wso = fip->fi_writesock; 416 rso = fip->fi_readsock; 417 solock(wso); 418 if (isrevoke) { 419 if (fip->fi_readers != 0) { 420 fip->fi_readers = 0; 421 socantsendmore(wso); 422 } 423 if (fip->fi_writers != 0) { 424 fip->fi_writers = 0; 425 socantrcvmore(rso); 426 } 427 } else { 428 if ((ap->a_fflag & FREAD) && --fip->fi_readers == 0) 429 socantsendmore(wso); 430 if ((ap->a_fflag & FWRITE) && --fip->fi_writers == 0) 431 socantrcvmore(rso); 432 } 433 if ((fip->fi_readers + fip->fi_writers) == 0) { 434 sounlock(wso); 435 (void) soclose(rso); 436 (void) soclose(wso); 437 cv_destroy(&fip->fi_rcv); 438 cv_destroy(&fip->fi_wcv); 439 kmem_free(fip, sizeof(*fip)); 440 vp->v_fifoinfo = NULL; 441 } else 442 sounlock(wso); 443 return (0); 444 } 445 446 /* 447 * Print out internal contents of a fifo vnode. 448 */ 449 static void 450 fifo_printinfo(struct vnode *vp) 451 { 452 struct fifoinfo *fip; 453 454 fip = vp->v_fifoinfo; 455 printf(", fifo with %d readers and %d writers", 456 fip->fi_readers, fip->fi_writers); 457 } 458 459 /* 460 * Print out the contents of a fifo vnode. 461 */ 462 static int 463 fifo_print(void *v) 464 { 465 struct vop_print_args /* { 466 struct vnode *a_vp; 467 } */ *ap = v; 468 469 /* 470 * We are most likely being called with the vnode belonging 471 * to some file system and this is not printed. 472 */ 473 if (ap->a_vp->v_tag == VT_NON) 474 printf("tag VT_NON"); 475 476 fifo_printinfo(ap->a_vp); 477 printf("\n"); 478 return 0; 479 } 480 481 /* 482 * Return POSIX pathconf information applicable to fifo's. 483 */ 484 static int 485 fifo_pathconf(void *v) 486 { 487 struct vop_pathconf_args /* { 488 struct vnode *a_vp; 489 int a_name; 490 register_t *a_retval; 491 } */ *ap = v; 492 493 switch (ap->a_name) { 494 case _PC_LINK_MAX: 495 *ap->a_retval = LINK_MAX; 496 return (0); 497 case _PC_PIPE_BUF: 498 *ap->a_retval = PIPE_BUF; 499 return (0); 500 case _PC_CHOWN_RESTRICTED: 501 *ap->a_retval = 1; 502 return (0); 503 case _PC_SYNC_IO: 504 *ap->a_retval = 1; 505 return (0); 506 default: 507 return (EINVAL); 508 } 509 /* NOTREACHED */ 510 } 511 512 static void 513 filt_fifordetach(struct knote *kn) 514 { 515 struct socket *so; 516 517 so = (struct socket *)kn->kn_hook; 518 solock(so); 519 SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext); 520 if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist)) 521 so->so_rcv.sb_flags &= ~SB_KNOTE; 522 sounlock(so); 523 } 524 525 static int 526 filt_fiforead(struct knote *kn, long hint) 527 { 528 struct socket *so; 529 int rv; 530 531 so = (struct socket *)kn->kn_hook; 532 if (hint != NOTE_SUBMIT) 533 solock(so); 534 kn->kn_data = so->so_rcv.sb_cc; 535 if (so->so_state & SS_CANTRCVMORE) { 536 kn->kn_flags |= EV_EOF; 537 rv = 1; 538 } else { 539 kn->kn_flags &= ~EV_EOF; 540 rv = (kn->kn_data > 0); 541 } 542 if (hint != NOTE_SUBMIT) 543 sounlock(so); 544 return rv; 545 } 546 547 static void 548 filt_fifowdetach(struct knote *kn) 549 { 550 struct socket *so; 551 552 so = (struct socket *)kn->kn_hook; 553 solock(so); 554 SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext); 555 if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist)) 556 so->so_snd.sb_flags &= ~SB_KNOTE; 557 sounlock(so); 558 } 559 560 static int 561 filt_fifowrite(struct knote *kn, long hint) 562 { 563 struct socket *so; 564 int rv; 565 566 so = (struct socket *)kn->kn_hook; 567 if (hint != NOTE_SUBMIT) 568 solock(so); 569 kn->kn_data = sbspace(&so->so_snd); 570 if (so->so_state & SS_CANTSENDMORE) { 571 kn->kn_flags |= EV_EOF; 572 rv = 1; 573 } else { 574 kn->kn_flags &= ~EV_EOF; 575 rv = (kn->kn_data >= so->so_snd.sb_lowat); 576 } 577 if (hint != NOTE_SUBMIT) 578 sounlock(so); 579 return rv; 580 } 581 582 static const struct filterops fiforead_filtops = 583 { 1, NULL, filt_fifordetach, filt_fiforead }; 584 static const struct filterops fifowrite_filtops = 585 { 1, NULL, filt_fifowdetach, filt_fifowrite }; 586 587 /* ARGSUSED */ 588 static int 589 fifo_kqfilter(void *v) 590 { 591 struct vop_kqfilter_args /* { 592 struct vnode *a_vp; 593 struct knote *a_kn; 594 } */ *ap = v; 595 struct socket *so; 596 struct sockbuf *sb; 597 598 so = (struct socket *)ap->a_vp->v_fifoinfo->fi_readsock; 599 switch (ap->a_kn->kn_filter) { 600 case EVFILT_READ: 601 ap->a_kn->kn_fop = &fiforead_filtops; 602 sb = &so->so_rcv; 603 break; 604 case EVFILT_WRITE: 605 ap->a_kn->kn_fop = &fifowrite_filtops; 606 sb = &so->so_snd; 607 break; 608 default: 609 return (EINVAL); 610 } 611 612 ap->a_kn->kn_hook = so; 613 614 solock(so); 615 SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, ap->a_kn, kn_selnext); 616 sb->sb_flags |= SB_KNOTE; 617 sounlock(so); 618 619 return (0); 620 } 621 622 int (**fifo_vnodeop_p)(void *); 623 const struct vnodeopv_entry_desc fifo_vnodeop_entries[] = { 624 { &vop_default_desc, vn_default_error }, 625 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 626 { &vop_create_desc, genfs_badop }, /* create */ 627 { &vop_mknod_desc, genfs_badop }, /* mknod */ 628 { &vop_open_desc, fifo_open }, /* open */ 629 { &vop_close_desc, fifo_close }, /* close */ 630 { &vop_access_desc, genfs_ebadf }, /* access */ 631 { &vop_getattr_desc, genfs_ebadf }, /* getattr */ 632 { &vop_setattr_desc, genfs_ebadf }, /* setattr */ 633 { &vop_read_desc, fifo_read }, /* read */ 634 { &vop_write_desc, fifo_write }, /* write */ 635 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 636 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 637 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 638 { &vop_poll_desc, fifo_poll }, /* poll */ 639 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 640 { &vop_revoke_desc, genfs_revoke }, /* revoke */ 641 { &vop_mmap_desc, genfs_badop }, /* mmap */ 642 { &vop_fsync_desc, genfs_nullop }, /* fsync */ 643 { &vop_seek_desc, genfs_badop }, /* seek */ 644 { &vop_remove_desc, genfs_badop }, /* remove */ 645 { &vop_link_desc, genfs_badop }, /* link */ 646 { &vop_rename_desc, genfs_badop }, /* rename */ 647 { &vop_mkdir_desc, genfs_badop }, /* mkdir */ 648 { &vop_rmdir_desc, genfs_badop }, /* rmdir */ 649 { &vop_symlink_desc, genfs_badop }, /* symlink */ 650 { &vop_readdir_desc, genfs_badop }, /* readdir */ 651 { &vop_readlink_desc, genfs_badop }, /* readlink */ 652 { &vop_abortop_desc, genfs_badop }, /* abortop */ 653 { &vop_inactive_desc, fifo_inactive }, /* inactive */ 654 { &vop_reclaim_desc, genfs_nullop }, /* reclaim */ 655 { &vop_lock_desc, genfs_lock }, /* lock */ 656 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 657 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 658 { &vop_strategy_desc, genfs_badop }, /* strategy */ 659 { &vop_print_desc, fifo_print }, /* print */ 660 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 661 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 662 { &vop_advlock_desc, genfs_einval }, /* advlock */ 663 { &vop_bwrite_desc, genfs_nullop }, /* bwrite */ 664 { &vop_putpages_desc, genfs_null_putpages }, /* putpages */ 665 { NULL, NULL } 666 }; 667 const struct vnodeopv_desc fifo_vnodeop_opv_desc = 668 { &fifo_vnodeop_p, fifo_vnodeop_entries }; 669
Indexes created Wed Sep 24 05:09:52 GMT 2025