fifo_vnops.c revision 1.71
1 /* $NetBSD: fifo_vnops.c,v 1.71 2011/12/20 23:56:29 christos 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 1.71 2011/12/20 23:56:29 christos 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_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 /* ARGSUSED */ 120 static int 121 fifo_open(void *v) 122 { 123 struct vop_open_args /* { 124 struct vnode *a_vp; 125 int a_mode; 126 kauth_cred_t a_cred; 127 } */ *ap = v; 128 struct lwp *l = curlwp; 129 struct vnode *vp; 130 struct fifoinfo *fip; 131 struct proc *p; 132 struct socket *rso, *wso; 133 int error; 134 135 vp = ap->a_vp; 136 p = l->l_proc; 137 138 if ((fip = vp->v_fifoinfo) == NULL) { 139 fip = kmem_alloc(sizeof(*fip), KM_SLEEP); 140 vp->v_fifoinfo = fip; 141 error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, l, NULL); 142 if (error != 0) { 143 kmem_free(fip, sizeof(*fip)); 144 vp->v_fifoinfo = NULL; 145 return (error); 146 } 147 fip->fi_readsock = rso; 148 error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, l, rso); 149 if (error != 0) { 150 (void)soclose(rso); 151 kmem_free(fip, sizeof(*fip)); 152 vp->v_fifoinfo = NULL; 153 return (error); 154 } 155 fip->fi_writesock = wso; 156 solock(wso); 157 if ((error = unp_connect2(wso, rso, PRU_CONNECT2)) != 0) { 158 sounlock(wso); 159 (void)soclose(wso); 160 (void)soclose(rso); 161 kmem_free(fip, sizeof(*fip)); 162 vp->v_fifoinfo = NULL; 163 return (error); 164 } 165 fip->fi_readers = 0; 166 fip->fi_writers = 0; 167 wso->so_state |= SS_CANTRCVMORE; 168 rso->so_state |= SS_CANTSENDMORE; 169 cv_init(&fip->fi_rcv, "fiford"); 170 cv_init(&fip->fi_wcv, "fifowr"); 171 } else { 172 wso = fip->fi_writesock; 173 rso = fip->fi_readsock; 174 solock(wso); 175 } 176 177 if (ap->a_mode & FREAD) { 178 if (fip->fi_readers++ == 0) { 179 wso->so_state &= ~SS_CANTSENDMORE; 180 cv_broadcast(&fip->fi_wcv); 181 } 182 } 183 if (ap->a_mode & FWRITE) { 184 if (fip->fi_writers++ == 0) { 185 rso->so_state &= ~SS_CANTRCVMORE; 186 cv_broadcast(&fip->fi_rcv); 187 } 188 } 189 if (ap->a_mode & FREAD) { 190 if (ap->a_mode & O_NONBLOCK) { 191 } else { 192 while (!soreadable(rso) && fip->fi_writers == 0) { 193 VOP_UNLOCK(vp); 194 error = cv_wait_sig(&fip->fi_rcv, 195 wso->so_lock); 196 sounlock(wso); 197 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 198 if (error) 199 goto bad; 200 solock(wso); 201 } 202 } 203 } 204 if (ap->a_mode & FWRITE) { 205 if (ap->a_mode & O_NONBLOCK) { 206 if (fip->fi_readers == 0) { 207 error = ENXIO; 208 sounlock(wso); 209 goto bad; 210 } 211 } else { 212 while (fip->fi_readers == 0) { 213 VOP_UNLOCK(vp); 214 error = cv_wait_sig(&fip->fi_wcv, 215 wso->so_lock); 216 sounlock(wso); 217 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 218 if (error) 219 goto bad; 220 solock(wso); 221 } 222 } 223 } 224 sounlock(wso); 225 return (0); 226 bad: 227 VOP_CLOSE(vp, ap->a_mode, ap->a_cred); 228 return (error); 229 } 230 231 /* 232 * Vnode op for read 233 */ 234 /* ARGSUSED */ 235 static int 236 fifo_read(void *v) 237 { 238 struct vop_read_args /* { 239 struct vnode *a_vp; 240 struct uio *a_uio; 241 int a_ioflag; 242 kauth_cred_t a_cred; 243 } */ *ap = v; 244 struct uio *uio; 245 struct socket *rso; 246 int error, sflags; 247 size_t startresid; 248 249 uio = ap->a_uio; 250 rso = ap->a_vp->v_fifoinfo->fi_readsock; 251 #ifdef DIAGNOSTIC 252 if (uio->uio_rw != UIO_READ) 253 panic("fifo_read mode"); 254 #endif 255 if (uio->uio_resid == 0) 256 return (0); 257 startresid = uio->uio_resid; 258 VOP_UNLOCK(ap->a_vp); 259 sflags = (ap->a_ioflag & IO_NDELAY) ? MSG_NBIO : 0; 260 error = (*rso->so_receive)(rso, NULL, uio, NULL, NULL, &sflags); 261 /* 262 * Clear EOF indication after first such return. 263 */ 264 if (error != EINTR && uio->uio_resid == startresid) 265 rso->so_state &= ~SS_CANTRCVMORE; 266 if (ap->a_ioflag & IO_NDELAY) { 267 if (error == EWOULDBLOCK && 268 ap->a_vp->v_fifoinfo->fi_writers == 0) 269 error = 0; 270 } 271 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY); 272 return (error); 273 } 274 275 /* 276 * Vnode op for write 277 */ 278 /* ARGSUSED */ 279 static int 280 fifo_write(void *v) 281 { 282 struct vop_write_args /* { 283 struct vnode *a_vp; 284 struct uio *a_uio; 285 int a_ioflag; 286 kauth_cred_t a_cred; 287 } */ *ap = v; 288 struct socket *wso; 289 int error, sflags; 290 291 wso = ap->a_vp->v_fifoinfo->fi_writesock; 292 #ifdef DIAGNOSTIC 293 if (ap->a_uio->uio_rw != UIO_WRITE) 294 panic("fifo_write mode"); 295 #endif 296 VOP_UNLOCK(ap->a_vp); 297 sflags = (ap->a_ioflag & IO_NDELAY) ? MSG_NBIO : 0; 298 error = (*wso->so_send)(wso, NULL, ap->a_uio, 0, NULL, sflags, curlwp); 299 vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY); 300 return (error); 301 } 302 303 /* 304 * Device ioctl operation. 305 */ 306 /* ARGSUSED */ 307 static int 308 fifo_ioctl(void *v) 309 { 310 struct vop_ioctl_args /* { 311 struct vnode *a_vp; 312 u_long a_command; 313 void *a_data; 314 int a_fflag; 315 kauth_cred_t a_cred; 316 struct lwp *a_l; 317 } */ *ap = v; 318 struct file filetmp; 319 int error; 320 321 if (ap->a_command == FIONBIO) 322 return (0); 323 if (ap->a_fflag & FREAD) { 324 filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock; 325 error = soo_ioctl(&filetmp, ap->a_command, ap->a_data); 326 if (error) 327 return (error); 328 } 329 if (ap->a_fflag & FWRITE) { 330 filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock; 331 error = soo_ioctl(&filetmp, ap->a_command, ap->a_data); 332 if (error) 333 return (error); 334 } 335 return (0); 336 } 337 338 /* ARGSUSED */ 339 static int 340 fifo_poll(void *v) 341 { 342 struct vop_poll_args /* { 343 struct vnode *a_vp; 344 int a_events; 345 struct lwp *a_l; 346 } */ *ap = v; 347 struct socket *so; 348 int revents; 349 350 revents = 0; 351 if (ap->a_events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { 352 so = ap->a_vp->v_fifoinfo->fi_readsock; 353 if (so) 354 revents |= sopoll(so, ap->a_events); 355 } 356 if (ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND)) { 357 so = ap->a_vp->v_fifoinfo->fi_writesock; 358 if (so) 359 revents |= sopoll(so, ap->a_events); 360 } 361 362 return (revents); 363 } 364 365 static int 366 fifo_inactive(void *v) 367 { 368 struct vop_inactive_args /* { 369 struct vnode *a_vp; 370 struct lwp *a_l; 371 } */ *ap = v; 372 373 VOP_UNLOCK(ap->a_vp); 374 return (0); 375 } 376 377 /* 378 * This is a noop, simply returning what one has been given. 379 */ 380 static int 381 fifo_bmap(void *v) 382 { 383 struct vop_bmap_args /* { 384 struct vnode *a_vp; 385 daddr_t a_bn; 386 struct vnode **a_vpp; 387 daddr_t *a_bnp; 388 int *a_runp; 389 } */ *ap = v; 390 391 if (ap->a_vpp != NULL) 392 *ap->a_vpp = ap->a_vp; 393 if (ap->a_bnp != NULL) 394 *ap->a_bnp = ap->a_bn; 395 if (ap->a_runp != NULL) 396 *ap->a_runp = 0; 397 return (0); 398 } 399 400 /* 401 * Device close routine 402 */ 403 /* ARGSUSED */ 404 static int 405 fifo_close(void *v) 406 { 407 struct vop_close_args /* { 408 struct vnode *a_vp; 409 int a_fflag; 410 kauth_cred_t a_cred; 411 struct lwp *a_l; 412 } */ *ap = v; 413 struct vnode *vp; 414 struct fifoinfo *fip; 415 struct socket *wso, *rso; 416 int isrevoke; 417 418 vp = ap->a_vp; 419 fip = vp->v_fifoinfo; 420 isrevoke = (ap->a_fflag & (FREAD | FWRITE | FNONBLOCK)) == FNONBLOCK; 421 wso = fip->fi_writesock; 422 rso = fip->fi_readsock; 423 solock(wso); 424 if (isrevoke) { 425 if (fip->fi_readers != 0) { 426 fip->fi_readers = 0; 427 socantsendmore(wso); 428 } 429 if (fip->fi_writers != 0) { 430 fip->fi_writers = 0; 431 socantrcvmore(rso); 432 } 433 } else { 434 if ((ap->a_fflag & FREAD) && --fip->fi_readers == 0) 435 socantsendmore(wso); 436 if ((ap->a_fflag & FWRITE) && --fip->fi_writers == 0) 437 socantrcvmore(rso); 438 } 439 if ((fip->fi_readers + fip->fi_writers) == 0) { 440 sounlock(wso); 441 (void) soclose(rso); 442 (void) soclose(wso); 443 cv_destroy(&fip->fi_rcv); 444 cv_destroy(&fip->fi_wcv); 445 kmem_free(fip, sizeof(*fip)); 446 vp->v_fifoinfo = NULL; 447 } else 448 sounlock(wso); 449 return (0); 450 } 451 452 /* 453 * Print out internal contents of a fifo vnode. 454 */ 455 static void 456 fifo_printinfo(struct vnode *vp) 457 { 458 struct fifoinfo *fip; 459 460 fip = vp->v_fifoinfo; 461 printf(", fifo with %d readers and %d writers", 462 fip->fi_readers, fip->fi_writers); 463 } 464 465 /* 466 * Print out the contents of a fifo vnode. 467 */ 468 static int 469 fifo_print(void *v) 470 { 471 struct vop_print_args /* { 472 struct vnode *a_vp; 473 } */ *ap = v; 474 475 /* 476 * We are most likely being called with the vnode belonging 477 * to some file system and this is not printed. 478 */ 479 if (ap->a_vp->v_tag == VT_NON) 480 printf("tag VT_NON"); 481 482 fifo_printinfo(ap->a_vp); 483 printf("\n"); 484 return 0; 485 } 486 487 /* 488 * Return POSIX pathconf information applicable to fifo's. 489 */ 490 static int 491 fifo_pathconf(void *v) 492 { 493 struct vop_pathconf_args /* { 494 struct vnode *a_vp; 495 int a_name; 496 register_t *a_retval; 497 } */ *ap = v; 498 499 switch (ap->a_name) { 500 case _PC_LINK_MAX: 501 *ap->a_retval = LINK_MAX; 502 return (0); 503 case _PC_PIPE_BUF: 504 *ap->a_retval = PIPE_BUF; 505 return (0); 506 case _PC_CHOWN_RESTRICTED: 507 *ap->a_retval = 1; 508 return (0); 509 case _PC_SYNC_IO: 510 *ap->a_retval = 1; 511 return (0); 512 default: 513 return (EINVAL); 514 } 515 /* NOTREACHED */ 516 } 517 518 static void 519 filt_fifordetach(struct knote *kn) 520 { 521 struct socket *so; 522 523 so = (struct socket *)kn->kn_hook; 524 solock(so); 525 SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext); 526 if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist)) 527 so->so_rcv.sb_flags &= ~SB_KNOTE; 528 sounlock(so); 529 } 530 531 static int 532 filt_fiforead(struct knote *kn, long hint) 533 { 534 struct socket *so; 535 int rv; 536 537 so = (struct socket *)kn->kn_hook; 538 if (hint != NOTE_SUBMIT) 539 solock(so); 540 kn->kn_data = so->so_rcv.sb_cc; 541 if (so->so_state & SS_CANTRCVMORE) { 542 kn->kn_flags |= EV_EOF; 543 rv = 1; 544 } else { 545 kn->kn_flags &= ~EV_EOF; 546 rv = (kn->kn_data > 0); 547 } 548 if (hint != NOTE_SUBMIT) 549 sounlock(so); 550 return rv; 551 } 552 553 static void 554 filt_fifowdetach(struct knote *kn) 555 { 556 struct socket *so; 557 558 so = (struct socket *)kn->kn_hook; 559 solock(so); 560 SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext); 561 if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist)) 562 so->so_snd.sb_flags &= ~SB_KNOTE; 563 sounlock(so); 564 } 565 566 static int 567 filt_fifowrite(struct knote *kn, long hint) 568 { 569 struct socket *so; 570 int rv; 571 572 so = (struct socket *)kn->kn_hook; 573 if (hint != NOTE_SUBMIT) 574 solock(so); 575 kn->kn_data = sbspace(&so->so_snd); 576 if (so->so_state & SS_CANTSENDMORE) { 577 kn->kn_flags |= EV_EOF; 578 rv = 1; 579 } else { 580 kn->kn_flags &= ~EV_EOF; 581 rv = (kn->kn_data >= so->so_snd.sb_lowat); 582 } 583 if (hint != NOTE_SUBMIT) 584 sounlock(so); 585 return rv; 586 } 587 588 static const struct filterops fiforead_filtops = 589 { 1, NULL, filt_fifordetach, filt_fiforead }; 590 static const struct filterops fifowrite_filtops = 591 { 1, NULL, filt_fifowdetach, filt_fifowrite }; 592 593 /* ARGSUSED */ 594 static int 595 fifo_kqfilter(void *v) 596 { 597 struct vop_kqfilter_args /* { 598 struct vnode *a_vp; 599 struct knote *a_kn; 600 } */ *ap = v; 601 struct socket *so; 602 struct sockbuf *sb; 603 604 so = (struct socket *)ap->a_vp->v_fifoinfo->fi_readsock; 605 switch (ap->a_kn->kn_filter) { 606 case EVFILT_READ: 607 ap->a_kn->kn_fop = &fiforead_filtops; 608 sb = &so->so_rcv; 609 break; 610 case EVFILT_WRITE: 611 ap->a_kn->kn_fop = &fifowrite_filtops; 612 sb = &so->so_snd; 613 break; 614 default: 615 return (EINVAL); 616 } 617 618 ap->a_kn->kn_hook = so; 619 620 solock(so); 621 SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, ap->a_kn, kn_selnext); 622 sb->sb_flags |= SB_KNOTE; 623 sounlock(so); 624 625 return (0); 626 } 627 628 int (**fifo_vnodeop_p)(void *); 629 const struct vnodeopv_entry_desc fifo_vnodeop_entries[] = { 630 { &vop_default_desc, vn_default_error }, 631 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 632 { &vop_create_desc, genfs_badop }, /* create */ 633 { &vop_mknod_desc, genfs_badop }, /* mknod */ 634 { &vop_open_desc, fifo_open }, /* open */ 635 { &vop_close_desc, fifo_close }, /* close */ 636 { &vop_access_desc, genfs_ebadf }, /* access */ 637 { &vop_getattr_desc, genfs_ebadf }, /* getattr */ 638 { &vop_setattr_desc, genfs_ebadf }, /* setattr */ 639 { &vop_read_desc, fifo_read }, /* read */ 640 { &vop_write_desc, fifo_write }, /* write */ 641 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 642 { &vop_poll_desc, fifo_poll }, /* poll */ 643 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 644 { &vop_revoke_desc, genfs_revoke }, /* revoke */ 645 { &vop_mmap_desc, genfs_badop }, /* mmap */ 646 { &vop_fsync_desc, genfs_nullop }, /* fsync */ 647 { &vop_seek_desc, genfs_badop }, /* seek */ 648 { &vop_remove_desc, genfs_badop }, /* remove */ 649 { &vop_link_desc, genfs_badop }, /* link */ 650 { &vop_rename_desc, genfs_badop }, /* rename */ 651 { &vop_mkdir_desc, genfs_badop }, /* mkdir */ 652 { &vop_rmdir_desc, genfs_badop }, /* rmdir */ 653 { &vop_symlink_desc, genfs_badop }, /* symlink */ 654 { &vop_readdir_desc, genfs_badop }, /* readdir */ 655 { &vop_readlink_desc, genfs_badop }, /* readlink */ 656 { &vop_abortop_desc, genfs_badop }, /* abortop */ 657 { &vop_inactive_desc, fifo_inactive }, /* inactive */ 658 { &vop_reclaim_desc, genfs_nullop }, /* reclaim */ 659 { &vop_lock_desc, genfs_lock }, /* lock */ 660 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 661 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 662 { &vop_strategy_desc, genfs_badop }, /* strategy */ 663 { &vop_print_desc, fifo_print }, /* print */ 664 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 665 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 666 { &vop_advlock_desc, genfs_einval }, /* advlock */ 667 { &vop_bwrite_desc, genfs_nullop }, /* bwrite */ 668 { &vop_putpages_desc, genfs_null_putpages }, /* putpages */ 669 { NULL, NULL } 670 }; 671 const struct vnodeopv_desc fifo_vnodeop_opv_desc = 672 { &fifo_vnodeop_p, fifo_vnodeop_entries }; 673
Indexes created Sat Sep 27 14:09:57 GMT 2025