1 /* $NetBSD: sys_descrip.c,v 1.38 2021/09/11 10:09:13 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2008, 2020 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) 1982, 1986, 1989, 1991, 1993 31 * The Regents of the University of California. All rights reserved. 32 * (c) UNIX System Laboratories, Inc. 33 * All or some portions of this file are derived from material licensed 34 * to the University of California by American Telephone and Telegraph 35 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 36 * the permission of UNIX System Laboratories, Inc. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)kern_descrip.c 8.8 (Berkeley) 2/14/95 63 */ 64 65 /* 66 * System calls on descriptors. 67 */ 68 69 #include <sys/cdefs.h> 70 __KERNEL_RCSID(0, "$NetBSD: sys_descrip.c,v 1.38 2021/09/11 10:09:13 riastradh Exp $"); 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/filedesc.h> 75 #include <sys/kernel.h> 76 #include <sys/vnode.h> 77 #include <sys/proc.h> 78 #include <sys/file.h> 79 #include <sys/namei.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/stat.h> 83 #include <sys/ioctl.h> 84 #include <sys/fcntl.h> 85 #include <sys/kmem.h> 86 #include <sys/pool.h> 87 #include <sys/syslog.h> 88 #include <sys/unistd.h> 89 #include <sys/resourcevar.h> 90 #include <sys/conf.h> 91 #include <sys/event.h> 92 #include <sys/kauth.h> 93 #include <sys/atomic.h> 94 #include <sys/mount.h> 95 #include <sys/syscallargs.h> 96 97 #include <uvm/uvm_readahead.h> 98 99 /* 100 * Duplicate a file descriptor. 101 */ 102 int 103 sys_dup(struct lwp *l, const struct sys_dup_args *uap, register_t *retval) 104 { 105 /* { 106 syscallarg(int) fd; 107 } */ 108 int error, newfd, oldfd; 109 file_t *fp; 110 111 oldfd = SCARG(uap, fd); 112 113 if ((fp = fd_getfile(oldfd)) == NULL) { 114 return EBADF; 115 } 116 error = fd_dup(fp, 0, &newfd, false); 117 fd_putfile(oldfd); 118 *retval = newfd; 119 return error; 120 } 121 122 /* 123 * Duplicate a file descriptor to a particular value. 124 */ 125 int 126 dodup(struct lwp *l, int from, int to, int flags, register_t *retval) 127 { 128 int error; 129 file_t *fp; 130 131 if ((fp = fd_getfile(from)) == NULL) 132 return EBADF; 133 mutex_enter(&fp->f_lock); 134 fp->f_count++; 135 mutex_exit(&fp->f_lock); 136 fd_putfile(from); 137 138 if ((u_int)to >= curproc->p_rlimit[RLIMIT_NOFILE].rlim_cur || 139 (u_int)to >= maxfiles) 140 error = EBADF; 141 else if (from == to) 142 error = 0; 143 else 144 error = fd_dup2(fp, to, flags); 145 closef(fp); 146 *retval = to; 147 148 return error; 149 } 150 151 int 152 sys_dup3(struct lwp *l, const struct sys_dup3_args *uap, register_t *retval) 153 { 154 /* { 155 syscallarg(int) from; 156 syscallarg(int) to; 157 syscallarg(int) flags; 158 } */ 159 return dodup(l, SCARG(uap, from), SCARG(uap, to), SCARG(uap, flags), 160 retval); 161 } 162 163 int 164 sys_dup2(struct lwp *l, const struct sys_dup2_args *uap, register_t *retval) 165 { 166 /* { 167 syscallarg(int) from; 168 syscallarg(int) to; 169 } */ 170 return dodup(l, SCARG(uap, from), SCARG(uap, to), 0, retval); 171 } 172 173 /* 174 * fcntl call which is being passed to the file's fs. 175 */ 176 static int 177 fcntl_forfs(int fd, file_t *fp, int cmd, void *arg) 178 { 179 int error; 180 u_int size; 181 void *data, *memp; 182 #define STK_PARAMS 128 183 char stkbuf[STK_PARAMS]; 184 185 if ((fp->f_flag & (FREAD | FWRITE)) == 0) 186 return (EBADF); 187 188 /* 189 * Interpret high order word to find amount of data to be 190 * copied to/from the user's address space. 191 */ 192 size = (size_t)F_PARAM_LEN(cmd); 193 if (size > F_PARAM_MAX) 194 return (EINVAL); 195 memp = NULL; 196 if (size > sizeof(stkbuf)) { 197 memp = kmem_alloc(size, KM_SLEEP); 198 data = memp; 199 } else 200 data = stkbuf; 201 if (cmd & F_FSIN) { 202 if (size) { 203 error = copyin(arg, data, size); 204 if (error) { 205 if (memp) 206 kmem_free(memp, size); 207 return (error); 208 } 209 } else 210 *(void **)data = arg; 211 } else if ((cmd & F_FSOUT) != 0 && size != 0) { 212 /* 213 * Zero the buffer so the user always 214 * gets back something deterministic. 215 */ 216 memset(data, 0, size); 217 } else if (cmd & F_FSVOID) 218 *(void **)data = arg; 219 220 221 error = (*fp->f_ops->fo_fcntl)(fp, cmd, data); 222 223 /* 224 * Copy any data to user, size was 225 * already set and checked above. 226 */ 227 if (error == 0 && (cmd & F_FSOUT) && size) 228 error = copyout(data, arg, size); 229 if (memp) 230 kmem_free(memp, size); 231 return (error); 232 } 233 234 int 235 do_fcntl_lock(int fd, int cmd, struct flock *fl) 236 { 237 file_t *fp; 238 vnode_t *vp; 239 proc_t *p; 240 int error, flg; 241 242 if ((error = fd_getvnode(fd, &fp)) != 0) 243 return error; 244 245 vp = fp->f_vnode; 246 if (fl->l_whence == SEEK_CUR) { 247 vn_lock(vp, LK_SHARED | LK_RETRY); 248 fl->l_start += fp->f_offset; 249 VOP_UNLOCK(vp); 250 } 251 252 flg = F_POSIX; 253 p = curproc; 254 255 switch (cmd) { 256 case F_SETLKW: 257 flg |= F_WAIT; 258 /* Fall into F_SETLK */ 259 260 /* FALLTHROUGH */ 261 case F_SETLK: 262 switch (fl->l_type) { 263 case F_RDLCK: 264 if ((fp->f_flag & FREAD) == 0) { 265 error = EBADF; 266 break; 267 } 268 if ((p->p_flag & PK_ADVLOCK) == 0) { 269 mutex_enter(p->p_lock); 270 p->p_flag |= PK_ADVLOCK; 271 mutex_exit(p->p_lock); 272 } 273 error = VOP_ADVLOCK(vp, p, F_SETLK, fl, flg); 274 break; 275 276 case F_WRLCK: 277 if ((fp->f_flag & FWRITE) == 0) { 278 error = EBADF; 279 break; 280 } 281 if ((p->p_flag & PK_ADVLOCK) == 0) { 282 mutex_enter(p->p_lock); 283 p->p_flag |= PK_ADVLOCK; 284 mutex_exit(p->p_lock); 285 } 286 error = VOP_ADVLOCK(vp, p, F_SETLK, fl, flg); 287 break; 288 289 case F_UNLCK: 290 error = VOP_ADVLOCK(vp, p, F_UNLCK, fl, F_POSIX); 291 break; 292 293 default: 294 error = EINVAL; 295 break; 296 } 297 break; 298 299 case F_GETLK: 300 if (fl->l_type != F_RDLCK && 301 fl->l_type != F_WRLCK && 302 fl->l_type != F_UNLCK) { 303 error = EINVAL; 304 break; 305 } 306 error = VOP_ADVLOCK(vp, p, F_GETLK, fl, F_POSIX); 307 break; 308 309 default: 310 error = EINVAL; 311 break; 312 } 313 314 fd_putfile(fd); 315 return error; 316 } 317 318 static int 319 do_fcntl_getpath(struct lwp *l, file_t *fp, char *upath) 320 { 321 char *kpath; 322 int error; 323 324 if (fp->f_type != DTYPE_VNODE) 325 return EOPNOTSUPP; 326 327 kpath = PNBUF_GET(); 328 329 error = vnode_to_path(kpath, MAXPATHLEN, fp->f_vnode, l, l->l_proc); 330 if (!error) 331 error = copyoutstr(kpath, upath, MAXPATHLEN, NULL); 332 333 PNBUF_PUT(kpath); 334 335 return error; 336 } 337 338 /* 339 * The file control system call. 340 */ 341 int 342 sys_fcntl(struct lwp *l, const struct sys_fcntl_args *uap, register_t *retval) 343 { 344 /* { 345 syscallarg(int) fd; 346 syscallarg(int) cmd; 347 syscallarg(void *) arg; 348 } */ 349 int fd, i, tmp, error, cmd, newmin; 350 filedesc_t *fdp; 351 fdtab_t *dt; 352 file_t *fp; 353 struct flock fl; 354 bool cloexec = false; 355 356 fd = SCARG(uap, fd); 357 cmd = SCARG(uap, cmd); 358 fdp = l->l_fd; 359 error = 0; 360 361 switch (cmd) { 362 case F_CLOSEM: 363 if (fd < 0) 364 return EBADF; 365 while ((i = fdp->fd_lastfile) >= fd) { 366 if (fd_getfile(i) == NULL) { 367 /* Another thread has updated. */ 368 continue; 369 } 370 fd_close(i); 371 } 372 return 0; 373 374 case F_MAXFD: 375 *retval = fdp->fd_lastfile; 376 return 0; 377 378 case F_SETLKW: 379 case F_SETLK: 380 case F_GETLK: 381 error = copyin(SCARG(uap, arg), &fl, sizeof(fl)); 382 if (error) 383 return error; 384 error = do_fcntl_lock(fd, cmd, &fl); 385 if (cmd == F_GETLK && error == 0) 386 error = copyout(&fl, SCARG(uap, arg), sizeof(fl)); 387 return error; 388 389 default: 390 /* Handled below */ 391 break; 392 } 393 394 if ((fp = fd_getfile(fd)) == NULL) 395 return EBADF; 396 397 if ((cmd & F_FSCTL)) { 398 error = fcntl_forfs(fd, fp, cmd, SCARG(uap, arg)); 399 fd_putfile(fd); 400 return error; 401 } 402 403 switch (cmd) { 404 case F_DUPFD_CLOEXEC: 405 cloexec = true; 406 /*FALLTHROUGH*/ 407 case F_DUPFD: 408 newmin = (long)SCARG(uap, arg); 409 if ((u_int)newmin >= 410 l->l_proc->p_rlimit[RLIMIT_NOFILE].rlim_cur || 411 (u_int)newmin >= maxfiles) { 412 fd_putfile(fd); 413 return EINVAL; 414 } 415 error = fd_dup(fp, newmin, &i, cloexec); 416 *retval = i; 417 break; 418 419 case F_GETFD: 420 dt = atomic_load_consume(&fdp->fd_dt); 421 *retval = dt->dt_ff[fd]->ff_exclose; 422 break; 423 424 case F_SETFD: 425 fd_set_exclose(l, fd, 426 ((long)SCARG(uap, arg) & FD_CLOEXEC) != 0); 427 break; 428 429 case F_GETNOSIGPIPE: 430 *retval = (fp->f_flag & FNOSIGPIPE) != 0; 431 break; 432 433 case F_SETNOSIGPIPE: 434 if (SCARG(uap, arg)) 435 atomic_or_uint(&fp->f_flag, FNOSIGPIPE); 436 else 437 atomic_and_uint(&fp->f_flag, ~FNOSIGPIPE); 438 *retval = 0; 439 break; 440 441 case F_GETFL: 442 *retval = OFLAGS(fp->f_flag); 443 break; 444 445 case F_SETFL: 446 /* XXX not guaranteed to be atomic. */ 447 tmp = FFLAGS((long)SCARG(uap, arg)) & FCNTLFLAGS; 448 error = (*fp->f_ops->fo_fcntl)(fp, F_SETFL, &tmp); 449 if (error) 450 break; 451 i = tmp ^ fp->f_flag; 452 if (i & FNONBLOCK) { 453 int flgs = tmp & FNONBLOCK; 454 error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, &flgs); 455 if (error) { 456 (*fp->f_ops->fo_fcntl)(fp, F_SETFL, 457 &fp->f_flag); 458 break; 459 } 460 } 461 if (i & FASYNC) { 462 int flgs = tmp & FASYNC; 463 error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, &flgs); 464 if (error) { 465 if (i & FNONBLOCK) { 466 tmp = fp->f_flag & FNONBLOCK; 467 (void)(*fp->f_ops->fo_ioctl)(fp, 468 FIONBIO, &tmp); 469 } 470 (*fp->f_ops->fo_fcntl)(fp, F_SETFL, 471 &fp->f_flag); 472 break; 473 } 474 } 475 fp->f_flag = (fp->f_flag & ~FCNTLFLAGS) | tmp; 476 break; 477 478 case F_GETOWN: 479 error = (*fp->f_ops->fo_ioctl)(fp, FIOGETOWN, &tmp); 480 *retval = tmp; 481 break; 482 483 case F_SETOWN: 484 tmp = (int)(uintptr_t) SCARG(uap, arg); 485 error = (*fp->f_ops->fo_ioctl)(fp, FIOSETOWN, &tmp); 486 break; 487 488 case F_GETPATH: 489 error = do_fcntl_getpath(l, fp, SCARG(uap, arg)); 490 break; 491 492 default: 493 error = EINVAL; 494 } 495 496 fd_putfile(fd); 497 return (error); 498 } 499 500 /* 501 * Close a file descriptor. 502 */ 503 int 504 sys_close(struct lwp *l, const struct sys_close_args *uap, register_t *retval) 505 { 506 /* { 507 syscallarg(int) fd; 508 } */ 509 int error; 510 int fd = SCARG(uap, fd); 511 512 if (fd_getfile(fd) == NULL) { 513 return EBADF; 514 } 515 516 error = fd_close(fd); 517 if (error == ERESTART) { 518 #ifdef DIAGNOSTIC 519 printf("%s[%d]: close(%d) returned ERESTART\n", 520 l->l_proc->p_comm, (int)l->l_proc->p_pid, fd); 521 #endif 522 error = EINTR; 523 } 524 525 return error; 526 } 527 528 /* 529 * Return status information about a file descriptor. 530 * Common function for compat code. 531 */ 532 int 533 do_sys_fstat(int fd, struct stat *sb) 534 { 535 file_t *fp; 536 int error; 537 538 if ((fp = fd_getfile(fd)) == NULL) { 539 return EBADF; 540 } 541 error = (*fp->f_ops->fo_stat)(fp, sb); 542 fd_putfile(fd); 543 544 return error; 545 } 546 547 /* 548 * Return status information about a file descriptor. 549 */ 550 int 551 sys___fstat50(struct lwp *l, const struct sys___fstat50_args *uap, 552 register_t *retval) 553 { 554 /* { 555 syscallarg(int) fd; 556 syscallarg(struct stat *) sb; 557 } */ 558 struct stat sb; 559 int error; 560 561 error = do_sys_fstat(SCARG(uap, fd), &sb); 562 if (error == 0) { 563 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 564 } 565 return error; 566 } 567 568 /* 569 * Return pathconf information about a file descriptor. 570 */ 571 int 572 sys_fpathconf(struct lwp *l, const struct sys_fpathconf_args *uap, 573 register_t *retval) 574 { 575 /* { 576 syscallarg(int) fd; 577 syscallarg(int) name; 578 } */ 579 int fd, error; 580 file_t *fp; 581 582 fd = SCARG(uap, fd); 583 error = 0; 584 585 if ((fp = fd_getfile(fd)) == NULL) { 586 return (EBADF); 587 } 588 switch (fp->f_type) { 589 case DTYPE_SOCKET: 590 case DTYPE_PIPE: 591 if (SCARG(uap, name) != _PC_PIPE_BUF) 592 error = EINVAL; 593 else 594 *retval = PIPE_BUF; 595 break; 596 597 case DTYPE_VNODE: 598 error = VOP_PATHCONF(fp->f_vnode, SCARG(uap, name), retval); 599 break; 600 601 case DTYPE_KQUEUE: 602 error = EINVAL; 603 break; 604 605 default: 606 error = EOPNOTSUPP; 607 break; 608 } 609 610 fd_putfile(fd); 611 return (error); 612 } 613 614 /* 615 * Apply an advisory lock on a file descriptor. 616 * 617 * Just attempt to get a record lock of the requested type on 618 * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0). 619 */ 620 /* ARGSUSED */ 621 int 622 sys_flock(struct lwp *l, const struct sys_flock_args *uap, register_t *retval) 623 { 624 /* { 625 syscallarg(int) fd; 626 syscallarg(int) how; 627 } */ 628 int fd, how, error; 629 file_t *fp; 630 vnode_t *vp; 631 struct flock lf; 632 633 fd = SCARG(uap, fd); 634 how = SCARG(uap, how); 635 636 if ((error = fd_getvnode(fd, &fp)) != 0) 637 return error == EINVAL ? EOPNOTSUPP : error; 638 639 vp = fp->f_vnode; 640 lf.l_whence = SEEK_SET; 641 lf.l_start = 0; 642 lf.l_len = 0; 643 644 switch (how & ~LOCK_NB) { 645 case LOCK_UN: 646 lf.l_type = F_UNLCK; 647 atomic_and_uint(&fp->f_flag, ~FHASLOCK); 648 error = VOP_ADVLOCK(vp, fp, F_UNLCK, &lf, F_FLOCK); 649 fd_putfile(fd); 650 return error; 651 case LOCK_EX: 652 lf.l_type = F_WRLCK; 653 break; 654 case LOCK_SH: 655 lf.l_type = F_RDLCK; 656 break; 657 default: 658 fd_putfile(fd); 659 return EINVAL; 660 } 661 662 atomic_or_uint(&fp->f_flag, FHASLOCK); 663 if (how & LOCK_NB) { 664 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, F_FLOCK); 665 } else { 666 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, F_FLOCK|F_WAIT); 667 } 668 fd_putfile(fd); 669 return error; 670 } 671 672 int 673 do_posix_fadvise(int fd, off_t offset, off_t len, int advice) 674 { 675 file_t *fp; 676 vnode_t *vp; 677 off_t endoffset; 678 int error; 679 680 CTASSERT(POSIX_FADV_NORMAL == UVM_ADV_NORMAL); 681 CTASSERT(POSIX_FADV_RANDOM == UVM_ADV_RANDOM); 682 CTASSERT(POSIX_FADV_SEQUENTIAL == UVM_ADV_SEQUENTIAL); 683 684 if (offset < 0) { 685 return EINVAL; 686 } 687 if (len == 0) { 688 endoffset = INT64_MAX; 689 } else if (len > 0 && (INT64_MAX - offset) >= len) { 690 endoffset = offset + len; 691 } else { 692 return EINVAL; 693 } 694 if ((fp = fd_getfile(fd)) == NULL) { 695 return EBADF; 696 } 697 if (fp->f_type != DTYPE_VNODE) { 698 if (fp->f_type == DTYPE_PIPE || fp->f_type == DTYPE_SOCKET) { 699 error = ESPIPE; 700 } else { 701 error = EOPNOTSUPP; 702 } 703 fd_putfile(fd); 704 return error; 705 } 706 707 switch (advice) { 708 case POSIX_FADV_WILLNEED: 709 case POSIX_FADV_DONTNEED: 710 vp = fp->f_vnode; 711 if (vp->v_type != VREG && vp->v_type != VBLK) { 712 fd_putfile(fd); 713 return 0; 714 } 715 break; 716 } 717 718 switch (advice) { 719 case POSIX_FADV_NORMAL: 720 case POSIX_FADV_RANDOM: 721 case POSIX_FADV_SEQUENTIAL: 722 /* 723 * We ignore offset and size. Must lock the file to 724 * do this, as f_advice is sub-word sized. 725 */ 726 mutex_enter(&fp->f_lock); 727 fp->f_advice = (u_char)advice; 728 mutex_exit(&fp->f_lock); 729 error = 0; 730 break; 731 732 case POSIX_FADV_WILLNEED: 733 vp = fp->f_vnode; 734 error = uvm_readahead(&vp->v_uobj, offset, endoffset - offset); 735 break; 736 737 case POSIX_FADV_DONTNEED: 738 vp = fp->f_vnode; 739 /* 740 * Align the region to page boundaries as VOP_PUTPAGES expects 741 * by shrinking it. We shrink instead of expand because we 742 * do not want to deactivate cache outside of the requested 743 * region. It means that if the specified region is smaller 744 * than PAGE_SIZE, we do nothing. 745 */ 746 if (round_page(offset) < trunc_page(endoffset) && 747 offset <= round_page(offset)) { 748 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 749 error = VOP_PUTPAGES(vp, 750 round_page(offset), trunc_page(endoffset), 751 PGO_DEACTIVATE | PGO_CLEANIT); 752 } else { 753 error = 0; 754 } 755 break; 756 757 case POSIX_FADV_NOREUSE: 758 /* Not implemented yet. */ 759 error = 0; 760 break; 761 default: 762 error = EINVAL; 763 break; 764 } 765 766 fd_putfile(fd); 767 return error; 768 } 769 770 int 771 sys___posix_fadvise50(struct lwp *l, 772 const struct sys___posix_fadvise50_args *uap, 773 register_t *retval) 774 { 775 /* { 776 syscallarg(int) fd; 777 syscallarg(int) pad; 778 syscallarg(off_t) offset; 779 syscallarg(off_t) len; 780 syscallarg(int) advice; 781 } */ 782 783 *retval = do_posix_fadvise(SCARG(uap, fd), SCARG(uap, offset), 784 SCARG(uap, len), SCARG(uap, advice)); 785 786 return 0; 787 } 788 789 int 790 sys_pipe(struct lwp *l, const void *v, register_t *retval) 791 { 792 int fd[2], error; 793 794 if ((error = pipe1(l, fd, 0)) != 0) 795 return error; 796 797 retval[0] = fd[0]; 798 retval[1] = fd[1]; 799 800 return 0; 801 } 802 803 int 804 sys_pipe2(struct lwp *l, const struct sys_pipe2_args *uap, register_t *retval) 805 { 806 /* { 807 syscallarg(int[2]) fildes; 808 syscallarg(int) flags; 809 } */ 810 int fd[2], error; 811 812 if ((error = pipe1(l, fd, SCARG(uap, flags))) != 0) 813 return error; 814 815 if ((error = copyout(fd, SCARG(uap, fildes), sizeof(fd))) != 0) 816 return error; 817 retval[0] = 0; 818 return 0; 819 } 820