1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2000-2004 5 * Poul-Henning Kamp. All rights reserved. 6 * Copyright (c) 1989, 1992-1993, 1995 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software donated to Berkeley by 10 * Jan-Simon Pendry. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95 34 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43 35 * 36 * $FreeBSD$ 37 */ 38 39 /* 40 * TODO: 41 * mkdir: want it ? 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/conf.h> 47 #include <sys/dirent.h> 48 #include <sys/eventhandler.h> 49 #include <sys/fcntl.h> 50 #include <sys/file.h> 51 #include <sys/filedesc.h> 52 #include <sys/filio.h> 53 #include <sys/jail.h> 54 #include <sys/kernel.h> 55 #include <sys/limits.h> 56 #include <sys/lock.h> 57 #include <sys/malloc.h> 58 #include <sys/mman.h> 59 #include <sys/mount.h> 60 #include <sys/namei.h> 61 #include <sys/priv.h> 62 #include <sys/proc.h> 63 #include <sys/stat.h> 64 #include <sys/sx.h> 65 #include <sys/sysctl.h> 66 #include <sys/time.h> 67 #include <sys/ttycom.h> 68 #include <sys/unistd.h> 69 #include <sys/vnode.h> 70 71 static struct vop_vector devfs_vnodeops; 72 static struct vop_vector devfs_specops; 73 static struct fileops devfs_ops_f; 74 75 #include <fs/devfs/devfs.h> 76 #include <fs/devfs/devfs_int.h> 77 78 #include <security/mac/mac_framework.h> 79 80 #include <vm/vm.h> 81 #include <vm/vm_extern.h> 82 #include <vm/vm_object.h> 83 84 static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data"); 85 86 struct mtx devfs_de_interlock; 87 MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF); 88 struct sx clone_drain_lock; 89 SX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock"); 90 struct mtx cdevpriv_mtx; 91 MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF); 92 93 SYSCTL_DECL(_vfs_devfs); 94 95 static int devfs_dotimes; 96 SYSCTL_INT(_vfs_devfs, OID_AUTO, dotimes, CTLFLAG_RW, 97 &devfs_dotimes, 0, "Update timestamps on DEVFS with default precision"); 98 99 /* 100 * Update devfs node timestamp. Note that updates are unlocked and 101 * stat(2) could see partially updated times. 102 */ 103 static void 104 devfs_timestamp(struct timespec *tsp) 105 { 106 time_t ts; 107 108 if (devfs_dotimes) { 109 vfs_timestamp(tsp); 110 } else { 111 ts = time_second; 112 if (tsp->tv_sec != ts) { 113 tsp->tv_sec = ts; 114 tsp->tv_nsec = 0; 115 } 116 } 117 } 118 119 static int 120 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp, 121 int *ref) 122 { 123 *dswp = devvn_refthread(fp->f_vnode, devp, ref); 124 if (*dswp == NULL || *devp != fp->f_data) { 125 if (*dswp != NULL) 126 dev_relthread(*devp, *ref); 127 return (ENXIO); 128 } 129 KASSERT((*devp)->si_refcount > 0, 130 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp))); 131 if (*dswp == NULL) 132 return (ENXIO); 133 curthread->td_fpop = fp; 134 return (0); 135 } 136 137 int 138 devfs_get_cdevpriv(void **datap) 139 { 140 struct file *fp; 141 struct cdev_privdata *p; 142 int error; 143 144 fp = curthread->td_fpop; 145 if (fp == NULL) 146 return (EBADF); 147 p = fp->f_cdevpriv; 148 if (p != NULL) { 149 error = 0; 150 *datap = p->cdpd_data; 151 } else 152 error = ENOENT; 153 return (error); 154 } 155 156 int 157 devfs_set_cdevpriv(void *priv, d_priv_dtor_t *priv_dtr) 158 { 159 struct file *fp; 160 struct cdev_priv *cdp; 161 struct cdev_privdata *p; 162 int error; 163 164 fp = curthread->td_fpop; 165 if (fp == NULL) 166 return (ENOENT); 167 cdp = cdev2priv((struct cdev *)fp->f_data); 168 p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK); 169 p->cdpd_data = priv; 170 p->cdpd_dtr = priv_dtr; 171 p->cdpd_fp = fp; 172 mtx_lock(&cdevpriv_mtx); 173 if (fp->f_cdevpriv == NULL) { 174 LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list); 175 fp->f_cdevpriv = p; 176 mtx_unlock(&cdevpriv_mtx); 177 error = 0; 178 } else { 179 mtx_unlock(&cdevpriv_mtx); 180 free(p, M_CDEVPDATA); 181 error = EBUSY; 182 } 183 return (error); 184 } 185 186 void 187 devfs_destroy_cdevpriv(struct cdev_privdata *p) 188 { 189 190 mtx_assert(&cdevpriv_mtx, MA_OWNED); 191 KASSERT(p->cdpd_fp->f_cdevpriv == p, 192 ("devfs_destoy_cdevpriv %p != %p", p->cdpd_fp->f_cdevpriv, p)); 193 p->cdpd_fp->f_cdevpriv = NULL; 194 LIST_REMOVE(p, cdpd_list); 195 mtx_unlock(&cdevpriv_mtx); 196 (p->cdpd_dtr)(p->cdpd_data); 197 free(p, M_CDEVPDATA); 198 } 199 200 static void 201 devfs_fpdrop(struct file *fp) 202 { 203 struct cdev_privdata *p; 204 205 mtx_lock(&cdevpriv_mtx); 206 if ((p = fp->f_cdevpriv) == NULL) { 207 mtx_unlock(&cdevpriv_mtx); 208 return; 209 } 210 devfs_destroy_cdevpriv(p); 211 } 212 213 void 214 devfs_clear_cdevpriv(void) 215 { 216 struct file *fp; 217 218 fp = curthread->td_fpop; 219 if (fp == NULL) 220 return; 221 devfs_fpdrop(fp); 222 } 223 224 static void 225 devfs_usecount_add(struct vnode *vp) 226 { 227 struct devfs_dirent *de; 228 struct cdev *dev; 229 230 mtx_lock(&devfs_de_interlock); 231 VI_LOCK(vp); 232 VNPASS(vp->v_type == VCHR || vp->v_type == VBAD, vp); 233 if (VN_IS_DOOMED(vp)) { 234 goto out_unlock; 235 } 236 237 de = vp->v_data; 238 dev = vp->v_rdev; 239 MPASS(de != NULL); 240 MPASS(dev != NULL); 241 dev->si_usecount++; 242 de->de_usecount++; 243 out_unlock: 244 VI_UNLOCK(vp); 245 mtx_unlock(&devfs_de_interlock); 246 } 247 248 static void 249 devfs_usecount_subl(struct vnode *vp) 250 { 251 struct devfs_dirent *de; 252 struct cdev *dev; 253 254 mtx_assert(&devfs_de_interlock, MA_OWNED); 255 ASSERT_VI_LOCKED(vp, __func__); 256 VNPASS(vp->v_type == VCHR || vp->v_type == VBAD, vp); 257 258 de = vp->v_data; 259 dev = vp->v_rdev; 260 if (de == NULL) 261 return; 262 if (dev == NULL) { 263 MPASS(de->de_usecount == 0); 264 return; 265 } 266 if (dev->si_usecount < de->de_usecount) 267 panic("%s: si_usecount underflow for dev %p " 268 "(has %ld, dirent has %d)\n", 269 __func__, dev, dev->si_usecount, de->de_usecount); 270 if (VN_IS_DOOMED(vp)) { 271 dev->si_usecount -= de->de_usecount; 272 de->de_usecount = 0; 273 } else { 274 if (de->de_usecount == 0) 275 panic("%s: de_usecount underflow for dev %p\n", 276 __func__, dev); 277 dev->si_usecount--; 278 de->de_usecount--; 279 } 280 } 281 282 static void 283 devfs_usecount_sub(struct vnode *vp) 284 { 285 286 mtx_lock(&devfs_de_interlock); 287 VI_LOCK(vp); 288 devfs_usecount_subl(vp); 289 VI_UNLOCK(vp); 290 mtx_unlock(&devfs_de_interlock); 291 } 292 293 static int 294 devfs_usecountl(struct vnode *vp) 295 { 296 297 VNPASS(vp->v_type == VCHR, vp); 298 mtx_assert(&devfs_de_interlock, MA_OWNED); 299 ASSERT_VI_LOCKED(vp, __func__); 300 return (vp->v_rdev->si_usecount); 301 } 302 303 int 304 devfs_usecount(struct vnode *vp) 305 { 306 int count; 307 308 VNPASS(vp->v_type == VCHR, vp); 309 mtx_lock(&devfs_de_interlock); 310 VI_LOCK(vp); 311 count = devfs_usecountl(vp); 312 VI_UNLOCK(vp); 313 mtx_unlock(&devfs_de_interlock); 314 return (count); 315 } 316 317 void 318 devfs_ctty_ref(struct vnode *vp) 319 { 320 321 vrefact(vp); 322 devfs_usecount_add(vp); 323 } 324 325 void 326 devfs_ctty_unref(struct vnode *vp) 327 { 328 329 devfs_usecount_sub(vp); 330 vrele(vp); 331 } 332 333 /* 334 * On success devfs_populate_vp() returns with dmp->dm_lock held. 335 */ 336 static int 337 devfs_populate_vp(struct vnode *vp) 338 { 339 struct devfs_dirent *de; 340 struct devfs_mount *dmp; 341 int locked; 342 343 ASSERT_VOP_LOCKED(vp, "devfs_populate_vp"); 344 345 dmp = VFSTODEVFS(vp->v_mount); 346 if (!devfs_populate_needed(dmp)) { 347 sx_xlock(&dmp->dm_lock); 348 goto out_nopopulate; 349 } 350 351 locked = VOP_ISLOCKED(vp); 352 353 sx_xlock(&dmp->dm_lock); 354 DEVFS_DMP_HOLD(dmp); 355 356 /* Can't call devfs_populate() with the vnode lock held. */ 357 VOP_UNLOCK(vp); 358 devfs_populate(dmp); 359 360 sx_xunlock(&dmp->dm_lock); 361 vn_lock(vp, locked | LK_RETRY); 362 sx_xlock(&dmp->dm_lock); 363 if (DEVFS_DMP_DROP(dmp)) { 364 sx_xunlock(&dmp->dm_lock); 365 devfs_unmount_final(dmp); 366 return (ERESTART); 367 } 368 out_nopopulate: 369 if (VN_IS_DOOMED(vp)) { 370 sx_xunlock(&dmp->dm_lock); 371 return (ERESTART); 372 } 373 de = vp->v_data; 374 KASSERT(de != NULL, 375 ("devfs_populate_vp: vp->v_data == NULL but vnode not doomed")); 376 if ((de->de_flags & DE_DOOMED) != 0) { 377 sx_xunlock(&dmp->dm_lock); 378 return (ERESTART); 379 } 380 381 return (0); 382 } 383 384 static int 385 devfs_vptocnp(struct vop_vptocnp_args *ap) 386 { 387 struct vnode *vp = ap->a_vp; 388 struct vnode **dvp = ap->a_vpp; 389 struct devfs_mount *dmp; 390 char *buf = ap->a_buf; 391 size_t *buflen = ap->a_buflen; 392 struct devfs_dirent *dd, *de; 393 int i, error; 394 395 dmp = VFSTODEVFS(vp->v_mount); 396 397 error = devfs_populate_vp(vp); 398 if (error != 0) 399 return (error); 400 401 if (vp->v_type != VCHR && vp->v_type != VDIR) { 402 error = ENOENT; 403 goto finished; 404 } 405 406 dd = vp->v_data; 407 if (vp->v_type == VDIR && dd == dmp->dm_rootdir) { 408 *dvp = vp; 409 vref(*dvp); 410 goto finished; 411 } 412 413 i = *buflen; 414 i -= dd->de_dirent->d_namlen; 415 if (i < 0) { 416 error = ENOMEM; 417 goto finished; 418 } 419 bcopy(dd->de_dirent->d_name, buf + i, dd->de_dirent->d_namlen); 420 *buflen = i; 421 de = devfs_parent_dirent(dd); 422 if (de == NULL) { 423 error = ENOENT; 424 goto finished; 425 } 426 mtx_lock(&devfs_de_interlock); 427 *dvp = de->de_vnode; 428 if (*dvp != NULL) { 429 VI_LOCK(*dvp); 430 mtx_unlock(&devfs_de_interlock); 431 vholdl(*dvp); 432 VI_UNLOCK(*dvp); 433 vref(*dvp); 434 vdrop(*dvp); 435 } else { 436 mtx_unlock(&devfs_de_interlock); 437 error = ENOENT; 438 } 439 finished: 440 sx_xunlock(&dmp->dm_lock); 441 return (error); 442 } 443 444 /* 445 * Construct the fully qualified path name relative to the mountpoint. 446 * If a NULL cnp is provided, no '/' is appended to the resulting path. 447 */ 448 char * 449 devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd, 450 struct componentname *cnp) 451 { 452 int i; 453 struct devfs_dirent *de; 454 455 sx_assert(&dmp->dm_lock, SA_LOCKED); 456 457 i = SPECNAMELEN; 458 buf[i] = '\0'; 459 if (cnp != NULL) 460 i -= cnp->cn_namelen; 461 if (i < 0) 462 return (NULL); 463 if (cnp != NULL) 464 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); 465 de = dd; 466 while (de != dmp->dm_rootdir) { 467 if (cnp != NULL || i < SPECNAMELEN) { 468 i--; 469 if (i < 0) 470 return (NULL); 471 buf[i] = '/'; 472 } 473 i -= de->de_dirent->d_namlen; 474 if (i < 0) 475 return (NULL); 476 bcopy(de->de_dirent->d_name, buf + i, 477 de->de_dirent->d_namlen); 478 de = devfs_parent_dirent(de); 479 if (de == NULL) 480 return (NULL); 481 } 482 return (buf + i); 483 } 484 485 static int 486 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp, 487 struct devfs_dirent *de) 488 { 489 int not_found; 490 491 not_found = 0; 492 if (de->de_flags & DE_DOOMED) 493 not_found = 1; 494 if (DEVFS_DE_DROP(de)) { 495 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed")); 496 devfs_dirent_free(de); 497 } 498 if (DEVFS_DMP_DROP(dmp)) { 499 KASSERT(not_found == 1, 500 ("DEVFS mount struct freed before dirent")); 501 not_found = 2; 502 sx_xunlock(&dmp->dm_lock); 503 devfs_unmount_final(dmp); 504 } 505 if (not_found == 1 || (drop_dm_lock && not_found != 2)) 506 sx_unlock(&dmp->dm_lock); 507 return (not_found); 508 } 509 510 /* 511 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops 512 * it on return. 513 */ 514 int 515 devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode, 516 struct vnode **vpp) 517 { 518 int error; 519 struct vnode *vp; 520 struct cdev *dev; 521 struct devfs_mount *dmp; 522 struct cdevsw *dsw; 523 enum vgetstate vs; 524 525 dmp = VFSTODEVFS(mp); 526 if (de->de_flags & DE_DOOMED) { 527 sx_xunlock(&dmp->dm_lock); 528 return (ENOENT); 529 } 530 loop: 531 DEVFS_DE_HOLD(de); 532 DEVFS_DMP_HOLD(dmp); 533 mtx_lock(&devfs_de_interlock); 534 vp = de->de_vnode; 535 if (vp != NULL) { 536 vs = vget_prep(vp); 537 mtx_unlock(&devfs_de_interlock); 538 sx_xunlock(&dmp->dm_lock); 539 vget_finish(vp, lockmode | LK_RETRY, vs); 540 sx_xlock(&dmp->dm_lock); 541 if (devfs_allocv_drop_refs(0, dmp, de)) { 542 vput(vp); 543 return (ENOENT); 544 } 545 else if (VN_IS_DOOMED(vp)) { 546 mtx_lock(&devfs_de_interlock); 547 if (de->de_vnode == vp) { 548 de->de_vnode = NULL; 549 vp->v_data = NULL; 550 } 551 mtx_unlock(&devfs_de_interlock); 552 vput(vp); 553 goto loop; 554 } 555 sx_xunlock(&dmp->dm_lock); 556 *vpp = vp; 557 return (0); 558 } 559 mtx_unlock(&devfs_de_interlock); 560 if (de->de_dirent->d_type == DT_CHR) { 561 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { 562 devfs_allocv_drop_refs(1, dmp, de); 563 return (ENOENT); 564 } 565 dev = &de->de_cdp->cdp_c; 566 } else { 567 dev = NULL; 568 } 569 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 570 if (error != 0) { 571 devfs_allocv_drop_refs(1, dmp, de); 572 printf("devfs_allocv: failed to allocate new vnode\n"); 573 return (error); 574 } 575 576 if (de->de_dirent->d_type == DT_CHR) { 577 vp->v_type = VCHR; 578 VI_LOCK(vp); 579 dev_lock(); 580 dev_refl(dev); 581 /* XXX: v_rdev should be protect by vnode lock */ 582 vp->v_rdev = dev; 583 VNPASS(vp->v_usecount == 1, vp); 584 /* Special casing of ttys for deadfs. Probably redundant. */ 585 dsw = dev->si_devsw; 586 if (dsw != NULL && (dsw->d_flags & D_TTY) != 0) 587 vp->v_vflag |= VV_ISTTY; 588 dev_unlock(); 589 VI_UNLOCK(vp); 590 if ((dev->si_flags & SI_ETERNAL) != 0) 591 vp->v_vflag |= VV_ETERNALDEV; 592 vp->v_op = &devfs_specops; 593 } else if (de->de_dirent->d_type == DT_DIR) { 594 vp->v_type = VDIR; 595 } else if (de->de_dirent->d_type == DT_LNK) { 596 vp->v_type = VLNK; 597 } else { 598 vp->v_type = VBAD; 599 } 600 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS); 601 VN_LOCK_ASHARE(vp); 602 mtx_lock(&devfs_de_interlock); 603 vp->v_data = de; 604 de->de_vnode = vp; 605 mtx_unlock(&devfs_de_interlock); 606 error = insmntque1(vp, mp); 607 if (error != 0) { 608 mtx_lock(&devfs_de_interlock); 609 vp->v_data = NULL; 610 de->de_vnode = NULL; 611 mtx_unlock(&devfs_de_interlock); 612 vgone(vp); 613 vput(vp); 614 (void) devfs_allocv_drop_refs(1, dmp, de); 615 return (error); 616 } 617 if (devfs_allocv_drop_refs(0, dmp, de)) { 618 vput(vp); 619 return (ENOENT); 620 } 621 #ifdef MAC 622 mac_devfs_vnode_associate(mp, de, vp); 623 #endif 624 sx_xunlock(&dmp->dm_lock); 625 *vpp = vp; 626 return (0); 627 } 628 629 static int 630 devfs_access(struct vop_access_args *ap) 631 { 632 struct vnode *vp = ap->a_vp; 633 struct devfs_dirent *de; 634 struct proc *p; 635 int error; 636 637 de = vp->v_data; 638 if (vp->v_type == VDIR) 639 de = de->de_dir; 640 641 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 642 ap->a_accmode, ap->a_cred); 643 if (error == 0) 644 return (0); 645 if (error != EACCES) 646 return (error); 647 p = ap->a_td->td_proc; 648 /* We do, however, allow access to the controlling terminal */ 649 PROC_LOCK(p); 650 if (!(p->p_flag & P_CONTROLT)) { 651 PROC_UNLOCK(p); 652 return (error); 653 } 654 if (p->p_session->s_ttydp == de->de_cdp) 655 error = 0; 656 PROC_UNLOCK(p); 657 return (error); 658 } 659 660 _Static_assert(((FMASK | FCNTLFLAGS) & (FLASTCLOSE | FREVOKE)) == 0, 661 "devfs-only flag reuse failed"); 662 663 static int 664 devfs_close(struct vop_close_args *ap) 665 { 666 struct vnode *vp = ap->a_vp, *oldvp; 667 struct thread *td = ap->a_td; 668 struct proc *p; 669 struct cdev *dev = vp->v_rdev; 670 struct cdevsw *dsw; 671 struct devfs_dirent *de = vp->v_data; 672 int dflags, error, ref, vp_locked; 673 674 /* 675 * XXX: Don't call d_close() if we were called because of 676 * XXX: insmntque() failure. 677 */ 678 if (vp->v_data == NULL) 679 return (0); 680 681 /* 682 * Hack: a tty device that is a controlling terminal 683 * has a reference from the session structure. 684 * We cannot easily tell that a character device is 685 * a controlling terminal, unless it is the closing 686 * process' controlling terminal. In that case, 687 * if the reference count is 2 (this last descriptor 688 * plus the session), release the reference from the session. 689 */ 690 if (de->de_usecount == 2 && td != NULL) { 691 p = td->td_proc; 692 PROC_LOCK(p); 693 if (vp == p->p_session->s_ttyvp) { 694 PROC_UNLOCK(p); 695 oldvp = NULL; 696 sx_xlock(&proctree_lock); 697 if (vp == p->p_session->s_ttyvp) { 698 SESS_LOCK(p->p_session); 699 mtx_lock(&devfs_de_interlock); 700 VI_LOCK(vp); 701 if (devfs_usecountl(vp) == 2 && !VN_IS_DOOMED(vp)) { 702 p->p_session->s_ttyvp = NULL; 703 p->p_session->s_ttydp = NULL; 704 oldvp = vp; 705 } 706 VI_UNLOCK(vp); 707 mtx_unlock(&devfs_de_interlock); 708 SESS_UNLOCK(p->p_session); 709 } 710 sx_xunlock(&proctree_lock); 711 if (oldvp != NULL) 712 devfs_ctty_unref(oldvp); 713 } else 714 PROC_UNLOCK(p); 715 } 716 /* 717 * We do not want to really close the device if it 718 * is still in use unless we are trying to close it 719 * forcibly. Since every use (buffer, vnode, swap, cmap) 720 * holds a reference to the vnode, and because we mark 721 * any other vnodes that alias this device, when the 722 * sum of the reference counts on all the aliased 723 * vnodes descends to one, we are on last close. 724 */ 725 dsw = dev_refthread(dev, &ref); 726 if (dsw == NULL) 727 return (ENXIO); 728 dflags = 0; 729 mtx_lock(&devfs_de_interlock); 730 VI_LOCK(vp); 731 if (devfs_usecountl(vp) == 1) 732 dflags |= FLASTCLOSE; 733 devfs_usecount_subl(vp); 734 mtx_unlock(&devfs_de_interlock); 735 if (VN_IS_DOOMED(vp)) { 736 /* Forced close. */ 737 dflags |= FREVOKE | FNONBLOCK; 738 } else if (dsw->d_flags & D_TRACKCLOSE) { 739 /* Keep device updated on status. */ 740 } else if ((dflags & FLASTCLOSE) == 0) { 741 VI_UNLOCK(vp); 742 dev_relthread(dev, ref); 743 return (0); 744 } 745 vholdnz(vp); 746 VI_UNLOCK(vp); 747 vp_locked = VOP_ISLOCKED(vp); 748 VOP_UNLOCK(vp); 749 KASSERT(dev->si_refcount > 0, 750 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 751 error = dsw->d_close(dev, ap->a_fflag | dflags, S_IFCHR, td); 752 dev_relthread(dev, ref); 753 vn_lock(vp, vp_locked | LK_RETRY); 754 vdrop(vp); 755 return (error); 756 } 757 758 static int 759 devfs_close_f(struct file *fp, struct thread *td) 760 { 761 int error; 762 struct file *fpop; 763 764 /* 765 * NB: td may be NULL if this descriptor is closed due to 766 * garbage collection from a closed UNIX domain socket. 767 */ 768 fpop = curthread->td_fpop; 769 curthread->td_fpop = fp; 770 error = vnops.fo_close(fp, td); 771 curthread->td_fpop = fpop; 772 773 /* 774 * The f_cdevpriv cannot be assigned non-NULL value while we 775 * are destroying the file. 776 */ 777 if (fp->f_cdevpriv != NULL) 778 devfs_fpdrop(fp); 779 return (error); 780 } 781 782 static int 783 devfs_getattr(struct vop_getattr_args *ap) 784 { 785 struct vnode *vp = ap->a_vp; 786 struct vattr *vap = ap->a_vap; 787 struct devfs_dirent *de; 788 struct devfs_mount *dmp; 789 struct cdev *dev; 790 struct timeval boottime; 791 int error; 792 793 error = devfs_populate_vp(vp); 794 if (error != 0) 795 return (error); 796 797 dmp = VFSTODEVFS(vp->v_mount); 798 sx_xunlock(&dmp->dm_lock); 799 800 de = vp->v_data; 801 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 802 if (vp->v_type == VDIR) { 803 de = de->de_dir; 804 KASSERT(de != NULL, 805 ("Null dir dirent in devfs_getattr vp=%p", vp)); 806 } 807 vap->va_uid = de->de_uid; 808 vap->va_gid = de->de_gid; 809 vap->va_mode = de->de_mode; 810 if (vp->v_type == VLNK) 811 vap->va_size = strlen(de->de_symlink); 812 else if (vp->v_type == VDIR) 813 vap->va_size = vap->va_bytes = DEV_BSIZE; 814 else 815 vap->va_size = 0; 816 if (vp->v_type != VDIR) 817 vap->va_bytes = 0; 818 vap->va_blocksize = DEV_BSIZE; 819 vap->va_type = vp->v_type; 820 821 getboottime(&boottime); 822 #define fix(aa) \ 823 do { \ 824 if ((aa).tv_sec <= 3600) { \ 825 (aa).tv_sec = boottime.tv_sec; \ 826 (aa).tv_nsec = boottime.tv_usec * 1000; \ 827 } \ 828 } while (0) 829 830 if (vp->v_type != VCHR) { 831 fix(de->de_atime); 832 vap->va_atime = de->de_atime; 833 fix(de->de_mtime); 834 vap->va_mtime = de->de_mtime; 835 fix(de->de_ctime); 836 vap->va_ctime = de->de_ctime; 837 } else { 838 dev = vp->v_rdev; 839 fix(dev->si_atime); 840 vap->va_atime = dev->si_atime; 841 fix(dev->si_mtime); 842 vap->va_mtime = dev->si_mtime; 843 fix(dev->si_ctime); 844 vap->va_ctime = dev->si_ctime; 845 846 vap->va_rdev = cdev2priv(dev)->cdp_inode; 847 } 848 vap->va_gen = 0; 849 vap->va_flags = 0; 850 vap->va_filerev = 0; 851 vap->va_nlink = de->de_links; 852 vap->va_fileid = de->de_inode; 853 854 return (error); 855 } 856 857 /* ARGSUSED */ 858 static int 859 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 860 { 861 struct file *fpop; 862 int error; 863 864 fpop = td->td_fpop; 865 td->td_fpop = fp; 866 error = vnops.fo_ioctl(fp, com, data, cred, td); 867 td->td_fpop = fpop; 868 return (error); 869 } 870 871 void * 872 fiodgname_buf_get_ptr(void *fgnp, u_long com) 873 { 874 union { 875 struct fiodgname_arg fgn; 876 #ifdef COMPAT_FREEBSD32 877 struct fiodgname_arg32 fgn32; 878 #endif 879 } *fgnup; 880 881 fgnup = fgnp; 882 switch (com) { 883 case FIODGNAME: 884 return (fgnup->fgn.buf); 885 #ifdef COMPAT_FREEBSD32 886 case FIODGNAME_32: 887 return ((void *)(uintptr_t)fgnup->fgn32.buf); 888 #endif 889 default: 890 panic("Unhandled ioctl command %ld", com); 891 } 892 } 893 894 static int 895 devfs_ioctl(struct vop_ioctl_args *ap) 896 { 897 struct fiodgname_arg *fgn; 898 struct vnode *vpold, *vp; 899 struct cdevsw *dsw; 900 struct thread *td; 901 struct session *sess; 902 struct cdev *dev; 903 int error, ref, i; 904 const char *p; 905 u_long com; 906 907 vp = ap->a_vp; 908 com = ap->a_command; 909 td = ap->a_td; 910 911 dsw = devvn_refthread(vp, &dev, &ref); 912 if (dsw == NULL) 913 return (ENXIO); 914 KASSERT(dev->si_refcount > 0, 915 ("devfs: un-referenced struct cdev *(%s)", devtoname(dev))); 916 917 switch (com) { 918 case FIODTYPE: 919 *(int *)ap->a_data = dsw->d_flags & D_TYPEMASK; 920 error = 0; 921 break; 922 case FIODGNAME: 923 #ifdef COMPAT_FREEBSD32 924 case FIODGNAME_32: 925 #endif 926 fgn = ap->a_data; 927 p = devtoname(dev); 928 i = strlen(p) + 1; 929 if (i > fgn->len) 930 error = EINVAL; 931 else 932 error = copyout(p, fiodgname_buf_get_ptr(fgn, com), i); 933 break; 934 default: 935 error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td); 936 } 937 938 dev_relthread(dev, ref); 939 if (error == ENOIOCTL) 940 error = ENOTTY; 941 942 if (error == 0 && com == TIOCSCTTY) { 943 /* 944 * Do nothing if reassigning same control tty, or if the 945 * control tty has already disappeared. If it disappeared, 946 * it's because we were racing with TIOCNOTTY. TIOCNOTTY 947 * already took care of releasing the old vnode and we have 948 * nothing left to do. 949 */ 950 sx_slock(&proctree_lock); 951 sess = td->td_proc->p_session; 952 if (sess->s_ttyvp == vp || sess->s_ttyp == NULL) { 953 sx_sunlock(&proctree_lock); 954 return (0); 955 } 956 957 devfs_ctty_ref(vp); 958 SESS_LOCK(sess); 959 vpold = sess->s_ttyvp; 960 sess->s_ttyvp = vp; 961 sess->s_ttydp = cdev2priv(dev); 962 SESS_UNLOCK(sess); 963 964 sx_sunlock(&proctree_lock); 965 966 /* Get rid of reference to old control tty */ 967 if (vpold) 968 devfs_ctty_unref(vpold); 969 } 970 return (error); 971 } 972 973 /* ARGSUSED */ 974 static int 975 devfs_kqfilter_f(struct file *fp, struct knote *kn) 976 { 977 struct cdev *dev; 978 struct cdevsw *dsw; 979 int error, ref; 980 struct file *fpop; 981 struct thread *td; 982 983 td = curthread; 984 fpop = td->td_fpop; 985 error = devfs_fp_check(fp, &dev, &dsw, &ref); 986 if (error) 987 return (error); 988 error = dsw->d_kqfilter(dev, kn); 989 td->td_fpop = fpop; 990 dev_relthread(dev, ref); 991 return (error); 992 } 993 994 static inline int 995 devfs_prison_check(struct devfs_dirent *de, struct thread *td) 996 { 997 struct cdev_priv *cdp; 998 struct ucred *dcr; 999 struct proc *p; 1000 int error; 1001 1002 cdp = de->de_cdp; 1003 if (cdp == NULL) 1004 return (0); 1005 dcr = cdp->cdp_c.si_cred; 1006 if (dcr == NULL) 1007 return (0); 1008 1009 error = prison_check(td->td_ucred, dcr); 1010 if (error == 0) 1011 return (0); 1012 /* We do, however, allow access to the controlling terminal */ 1013 p = td->td_proc; 1014 PROC_LOCK(p); 1015 if (!(p->p_flag & P_CONTROLT)) { 1016 PROC_UNLOCK(p); 1017 return (error); 1018 } 1019 if (p->p_session->s_ttydp == cdp) 1020 error = 0; 1021 PROC_UNLOCK(p); 1022 return (error); 1023 } 1024 1025 static int 1026 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 1027 { 1028 struct componentname *cnp; 1029 struct vnode *dvp, **vpp; 1030 struct thread *td; 1031 struct devfs_dirent *de, *dd; 1032 struct devfs_dirent **dde; 1033 struct devfs_mount *dmp; 1034 struct mount *mp; 1035 struct cdev *cdev; 1036 int error, flags, nameiop, dvplocked; 1037 char specname[SPECNAMELEN + 1], *pname; 1038 1039 td = curthread; 1040 cnp = ap->a_cnp; 1041 vpp = ap->a_vpp; 1042 dvp = ap->a_dvp; 1043 pname = cnp->cn_nameptr; 1044 flags = cnp->cn_flags; 1045 nameiop = cnp->cn_nameiop; 1046 mp = dvp->v_mount; 1047 dmp = VFSTODEVFS(mp); 1048 dd = dvp->v_data; 1049 *vpp = NULLVP; 1050 1051 if ((flags & ISLASTCN) && nameiop == RENAME) 1052 return (EOPNOTSUPP); 1053 1054 if (dvp->v_type != VDIR) 1055 return (ENOTDIR); 1056 1057 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 1058 return (EIO); 1059 1060 error = vn_dir_check_exec(dvp, cnp); 1061 if (error != 0) 1062 return (error); 1063 1064 if (cnp->cn_namelen == 1 && *pname == '.') { 1065 if ((flags & ISLASTCN) && nameiop != LOOKUP) 1066 return (EINVAL); 1067 *vpp = dvp; 1068 VREF(dvp); 1069 return (0); 1070 } 1071 1072 if (flags & ISDOTDOT) { 1073 if ((flags & ISLASTCN) && nameiop != LOOKUP) 1074 return (EINVAL); 1075 de = devfs_parent_dirent(dd); 1076 if (de == NULL) 1077 return (ENOENT); 1078 dvplocked = VOP_ISLOCKED(dvp); 1079 VOP_UNLOCK(dvp); 1080 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, 1081 vpp); 1082 *dm_unlock = 0; 1083 vn_lock(dvp, dvplocked | LK_RETRY); 1084 return (error); 1085 } 1086 1087 dd = dvp->v_data; 1088 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0); 1089 while (de == NULL) { /* While(...) so we can use break */ 1090 1091 if (nameiop == DELETE) 1092 return (ENOENT); 1093 1094 /* 1095 * OK, we didn't have an entry for the name we were asked for 1096 * so we try to see if anybody can create it on demand. 1097 */ 1098 pname = devfs_fqpn(specname, dmp, dd, cnp); 1099 if (pname == NULL) 1100 break; 1101 1102 cdev = NULL; 1103 DEVFS_DMP_HOLD(dmp); 1104 sx_xunlock(&dmp->dm_lock); 1105 sx_slock(&clone_drain_lock); 1106 EVENTHANDLER_INVOKE(dev_clone, 1107 td->td_ucred, pname, strlen(pname), &cdev); 1108 sx_sunlock(&clone_drain_lock); 1109 1110 if (cdev == NULL) 1111 sx_xlock(&dmp->dm_lock); 1112 else if (devfs_populate_vp(dvp) != 0) { 1113 *dm_unlock = 0; 1114 sx_xlock(&dmp->dm_lock); 1115 if (DEVFS_DMP_DROP(dmp)) { 1116 sx_xunlock(&dmp->dm_lock); 1117 devfs_unmount_final(dmp); 1118 } else 1119 sx_xunlock(&dmp->dm_lock); 1120 dev_rel(cdev); 1121 return (ENOENT); 1122 } 1123 if (DEVFS_DMP_DROP(dmp)) { 1124 *dm_unlock = 0; 1125 sx_xunlock(&dmp->dm_lock); 1126 devfs_unmount_final(dmp); 1127 if (cdev != NULL) 1128 dev_rel(cdev); 1129 return (ENOENT); 1130 } 1131 1132 if (cdev == NULL) 1133 break; 1134 1135 dev_lock(); 1136 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx]; 1137 if (dde != NULL && *dde != NULL) 1138 de = *dde; 1139 dev_unlock(); 1140 dev_rel(cdev); 1141 break; 1142 } 1143 1144 if (de == NULL || de->de_flags & DE_WHITEOUT) { 1145 if ((nameiop == CREATE || nameiop == RENAME) && 1146 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 1147 cnp->cn_flags |= SAVENAME; 1148 return (EJUSTRETURN); 1149 } 1150 return (ENOENT); 1151 } 1152 1153 if (devfs_prison_check(de, td)) 1154 return (ENOENT); 1155 1156 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 1157 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 1158 if (error) 1159 return (error); 1160 if (*vpp == dvp) { 1161 VREF(dvp); 1162 *vpp = dvp; 1163 return (0); 1164 } 1165 } 1166 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, vpp); 1167 *dm_unlock = 0; 1168 return (error); 1169 } 1170 1171 static int 1172 devfs_lookup(struct vop_lookup_args *ap) 1173 { 1174 int j; 1175 struct devfs_mount *dmp; 1176 int dm_unlock; 1177 1178 if (devfs_populate_vp(ap->a_dvp) != 0) 1179 return (ENOTDIR); 1180 1181 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1182 dm_unlock = 1; 1183 j = devfs_lookupx(ap, &dm_unlock); 1184 if (dm_unlock == 1) 1185 sx_xunlock(&dmp->dm_lock); 1186 return (j); 1187 } 1188 1189 static int 1190 devfs_mknod(struct vop_mknod_args *ap) 1191 { 1192 struct componentname *cnp; 1193 struct vnode *dvp, **vpp; 1194 struct devfs_dirent *dd, *de; 1195 struct devfs_mount *dmp; 1196 int error; 1197 1198 /* 1199 * The only type of node we should be creating here is a 1200 * character device, for anything else return EOPNOTSUPP. 1201 */ 1202 if (ap->a_vap->va_type != VCHR) 1203 return (EOPNOTSUPP); 1204 dvp = ap->a_dvp; 1205 dmp = VFSTODEVFS(dvp->v_mount); 1206 1207 cnp = ap->a_cnp; 1208 vpp = ap->a_vpp; 1209 dd = dvp->v_data; 1210 1211 error = ENOENT; 1212 sx_xlock(&dmp->dm_lock); 1213 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 1214 if (cnp->cn_namelen != de->de_dirent->d_namlen) 1215 continue; 1216 if (de->de_dirent->d_type == DT_CHR && 1217 (de->de_cdp->cdp_flags & CDP_ACTIVE) == 0) 1218 continue; 1219 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 1220 de->de_dirent->d_namlen) != 0) 1221 continue; 1222 if (de->de_flags & DE_WHITEOUT) 1223 break; 1224 goto notfound; 1225 } 1226 if (de == NULL) 1227 goto notfound; 1228 de->de_flags &= ~DE_WHITEOUT; 1229 error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp); 1230 return (error); 1231 notfound: 1232 sx_xunlock(&dmp->dm_lock); 1233 return (error); 1234 } 1235 1236 /* ARGSUSED */ 1237 static int 1238 devfs_open(struct vop_open_args *ap) 1239 { 1240 struct thread *td = ap->a_td; 1241 struct vnode *vp = ap->a_vp; 1242 struct cdev *dev = vp->v_rdev; 1243 struct file *fp = ap->a_fp; 1244 int error, ref, vlocked; 1245 struct cdevsw *dsw; 1246 struct file *fpop; 1247 1248 if (vp->v_type == VBLK) 1249 return (ENXIO); 1250 1251 if (dev == NULL) 1252 return (ENXIO); 1253 1254 /* Make this field valid before any I/O in d_open. */ 1255 if (dev->si_iosize_max == 0) 1256 dev->si_iosize_max = DFLTPHYS; 1257 1258 dsw = dev_refthread(dev, &ref); 1259 if (dsw == NULL) 1260 return (ENXIO); 1261 if (fp == NULL && dsw->d_fdopen != NULL) { 1262 dev_relthread(dev, ref); 1263 return (ENXIO); 1264 } 1265 1266 if (vp->v_type == VCHR) 1267 devfs_usecount_add(vp); 1268 1269 vlocked = VOP_ISLOCKED(vp); 1270 VOP_UNLOCK(vp); 1271 1272 fpop = td->td_fpop; 1273 td->td_fpop = fp; 1274 if (fp != NULL) { 1275 fp->f_data = dev; 1276 fp->f_vnode = vp; 1277 } 1278 if (dsw->d_fdopen != NULL) 1279 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 1280 else 1281 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 1282 /* Clean up any cdevpriv upon error. */ 1283 if (error != 0) 1284 devfs_clear_cdevpriv(); 1285 td->td_fpop = fpop; 1286 1287 vn_lock(vp, vlocked | LK_RETRY); 1288 if (error != 0 && vp->v_type == VCHR) 1289 devfs_usecount_sub(vp); 1290 1291 dev_relthread(dev, ref); 1292 if (error != 0) { 1293 if (error == ERESTART) 1294 error = EINTR; 1295 return (error); 1296 } 1297 1298 #if 0 /* /dev/console */ 1299 KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp")); 1300 #else 1301 if (fp == NULL) 1302 return (error); 1303 #endif 1304 if (fp->f_ops == &badfileops) 1305 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f); 1306 return (error); 1307 } 1308 1309 static int 1310 devfs_pathconf(struct vop_pathconf_args *ap) 1311 { 1312 1313 switch (ap->a_name) { 1314 case _PC_FILESIZEBITS: 1315 *ap->a_retval = 64; 1316 return (0); 1317 case _PC_NAME_MAX: 1318 *ap->a_retval = NAME_MAX; 1319 return (0); 1320 case _PC_LINK_MAX: 1321 *ap->a_retval = INT_MAX; 1322 return (0); 1323 case _PC_SYMLINK_MAX: 1324 *ap->a_retval = MAXPATHLEN; 1325 return (0); 1326 case _PC_MAX_CANON: 1327 if (ap->a_vp->v_vflag & VV_ISTTY) { 1328 *ap->a_retval = MAX_CANON; 1329 return (0); 1330 } 1331 return (EINVAL); 1332 case _PC_MAX_INPUT: 1333 if (ap->a_vp->v_vflag & VV_ISTTY) { 1334 *ap->a_retval = MAX_INPUT; 1335 return (0); 1336 } 1337 return (EINVAL); 1338 case _PC_VDISABLE: 1339 if (ap->a_vp->v_vflag & VV_ISTTY) { 1340 *ap->a_retval = _POSIX_VDISABLE; 1341 return (0); 1342 } 1343 return (EINVAL); 1344 case _PC_MAC_PRESENT: 1345 #ifdef MAC 1346 /* 1347 * If MAC is enabled, devfs automatically supports 1348 * trivial non-persistent label storage. 1349 */ 1350 *ap->a_retval = 1; 1351 #else 1352 *ap->a_retval = 0; 1353 #endif 1354 return (0); 1355 case _PC_CHOWN_RESTRICTED: 1356 *ap->a_retval = 1; 1357 return (0); 1358 default: 1359 return (vop_stdpathconf(ap)); 1360 } 1361 /* NOTREACHED */ 1362 } 1363 1364 /* ARGSUSED */ 1365 static int 1366 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 1367 { 1368 struct cdev *dev; 1369 struct cdevsw *dsw; 1370 int error, ref; 1371 struct file *fpop; 1372 1373 fpop = td->td_fpop; 1374 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1375 if (error != 0) { 1376 error = vnops.fo_poll(fp, events, cred, td); 1377 return (error); 1378 } 1379 error = dsw->d_poll(dev, events, td); 1380 td->td_fpop = fpop; 1381 dev_relthread(dev, ref); 1382 return(error); 1383 } 1384 1385 /* 1386 * Print out the contents of a special device vnode. 1387 */ 1388 static int 1389 devfs_print(struct vop_print_args *ap) 1390 { 1391 1392 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 1393 return (0); 1394 } 1395 1396 static int 1397 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, 1398 int flags, struct thread *td) 1399 { 1400 struct cdev *dev; 1401 int ioflag, error, ref; 1402 ssize_t resid; 1403 struct cdevsw *dsw; 1404 struct file *fpop; 1405 1406 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1407 return (EINVAL); 1408 fpop = td->td_fpop; 1409 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1410 if (error != 0) { 1411 error = vnops.fo_read(fp, uio, cred, flags, td); 1412 return (error); 1413 } 1414 resid = uio->uio_resid; 1415 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 1416 if (ioflag & O_DIRECT) 1417 ioflag |= IO_DIRECT; 1418 1419 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1420 error = dsw->d_read(dev, uio, ioflag); 1421 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 1422 devfs_timestamp(&dev->si_atime); 1423 td->td_fpop = fpop; 1424 dev_relthread(dev, ref); 1425 1426 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_R); 1427 return (error); 1428 } 1429 1430 static int 1431 devfs_readdir(struct vop_readdir_args *ap) 1432 { 1433 int error; 1434 struct uio *uio; 1435 struct dirent *dp; 1436 struct devfs_dirent *dd; 1437 struct devfs_dirent *de; 1438 struct devfs_mount *dmp; 1439 off_t off; 1440 int *tmp_ncookies = NULL; 1441 1442 if (ap->a_vp->v_type != VDIR) 1443 return (ENOTDIR); 1444 1445 uio = ap->a_uio; 1446 if (uio->uio_offset < 0) 1447 return (EINVAL); 1448 1449 /* 1450 * XXX: This is a temporary hack to get around this filesystem not 1451 * supporting cookies. We store the location of the ncookies pointer 1452 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 1453 * and set the number of cookies to 0. We then set the pointer to 1454 * NULL so that vfs_read_dirent doesn't try to call realloc() on 1455 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 1456 * pointer to its original location before returning to the caller. 1457 */ 1458 if (ap->a_ncookies != NULL) { 1459 tmp_ncookies = ap->a_ncookies; 1460 *ap->a_ncookies = 0; 1461 ap->a_ncookies = NULL; 1462 } 1463 1464 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1465 if (devfs_populate_vp(ap->a_vp) != 0) { 1466 if (tmp_ncookies != NULL) 1467 ap->a_ncookies = tmp_ncookies; 1468 return (EIO); 1469 } 1470 error = 0; 1471 de = ap->a_vp->v_data; 1472 off = 0; 1473 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 1474 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 1475 if (dd->de_flags & (DE_COVERED | DE_WHITEOUT)) 1476 continue; 1477 if (devfs_prison_check(dd, uio->uio_td)) 1478 continue; 1479 if (dd->de_dirent->d_type == DT_DIR) 1480 de = dd->de_dir; 1481 else 1482 de = dd; 1483 dp = dd->de_dirent; 1484 MPASS(dp->d_reclen == GENERIC_DIRSIZ(dp)); 1485 if (dp->d_reclen > uio->uio_resid) 1486 break; 1487 dp->d_fileno = de->de_inode; 1488 /* NOTE: d_off is the offset for the *next* entry. */ 1489 dp->d_off = off + dp->d_reclen; 1490 if (off >= uio->uio_offset) { 1491 error = vfs_read_dirent(ap, dp, off); 1492 if (error) 1493 break; 1494 } 1495 off += dp->d_reclen; 1496 } 1497 sx_xunlock(&dmp->dm_lock); 1498 uio->uio_offset = off; 1499 1500 /* 1501 * Restore ap->a_ncookies if it wasn't originally NULL in the first 1502 * place. 1503 */ 1504 if (tmp_ncookies != NULL) 1505 ap->a_ncookies = tmp_ncookies; 1506 1507 return (error); 1508 } 1509 1510 static int 1511 devfs_readlink(struct vop_readlink_args *ap) 1512 { 1513 struct devfs_dirent *de; 1514 1515 de = ap->a_vp->v_data; 1516 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 1517 } 1518 1519 static void 1520 devfs_reclaiml(struct vnode *vp) 1521 { 1522 struct devfs_dirent *de; 1523 1524 mtx_assert(&devfs_de_interlock, MA_OWNED); 1525 de = vp->v_data; 1526 if (de != NULL) { 1527 MPASS(de->de_usecount == 0); 1528 de->de_vnode = NULL; 1529 vp->v_data = NULL; 1530 } 1531 } 1532 1533 static int 1534 devfs_reclaim(struct vop_reclaim_args *ap) 1535 { 1536 struct vnode *vp; 1537 1538 vp = ap->a_vp; 1539 mtx_lock(&devfs_de_interlock); 1540 devfs_reclaiml(vp); 1541 mtx_unlock(&devfs_de_interlock); 1542 return (0); 1543 } 1544 1545 static int 1546 devfs_reclaim_vchr(struct vop_reclaim_args *ap) 1547 { 1548 struct vnode *vp; 1549 struct cdev *dev; 1550 1551 vp = ap->a_vp; 1552 MPASS(vp->v_type == VCHR); 1553 1554 mtx_lock(&devfs_de_interlock); 1555 VI_LOCK(vp); 1556 devfs_usecount_subl(vp); 1557 devfs_reclaiml(vp); 1558 mtx_unlock(&devfs_de_interlock); 1559 dev_lock(); 1560 dev = vp->v_rdev; 1561 vp->v_rdev = NULL; 1562 dev_unlock(); 1563 VI_UNLOCK(vp); 1564 if (dev != NULL) 1565 dev_rel(dev); 1566 return (0); 1567 } 1568 1569 static int 1570 devfs_remove(struct vop_remove_args *ap) 1571 { 1572 struct vnode *dvp = ap->a_dvp; 1573 struct vnode *vp = ap->a_vp; 1574 struct devfs_dirent *dd; 1575 struct devfs_dirent *de, *de_covered; 1576 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1577 1578 ASSERT_VOP_ELOCKED(dvp, "devfs_remove"); 1579 ASSERT_VOP_ELOCKED(vp, "devfs_remove"); 1580 1581 sx_xlock(&dmp->dm_lock); 1582 dd = ap->a_dvp->v_data; 1583 de = vp->v_data; 1584 if (de->de_cdp == NULL) { 1585 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1586 if (de->de_dirent->d_type == DT_LNK) { 1587 de_covered = devfs_find(dd, de->de_dirent->d_name, 1588 de->de_dirent->d_namlen, 0); 1589 if (de_covered != NULL) 1590 de_covered->de_flags &= ~DE_COVERED; 1591 } 1592 /* We need to unlock dvp because devfs_delete() may lock it. */ 1593 VOP_UNLOCK(vp); 1594 if (dvp != vp) 1595 VOP_UNLOCK(dvp); 1596 devfs_delete(dmp, de, 0); 1597 sx_xunlock(&dmp->dm_lock); 1598 if (dvp != vp) 1599 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1600 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1601 } else { 1602 de->de_flags |= DE_WHITEOUT; 1603 sx_xunlock(&dmp->dm_lock); 1604 } 1605 return (0); 1606 } 1607 1608 /* 1609 * Revoke is called on a tty when a terminal session ends. The vnode 1610 * is orphaned by setting v_op to deadfs so we need to let go of it 1611 * as well so that we create a new one next time around. 1612 * 1613 */ 1614 static int 1615 devfs_revoke(struct vop_revoke_args *ap) 1616 { 1617 struct vnode *vp = ap->a_vp, *vp2; 1618 struct cdev *dev; 1619 struct cdev_priv *cdp; 1620 struct devfs_dirent *de; 1621 enum vgetstate vs; 1622 u_int i; 1623 1624 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1625 1626 dev = vp->v_rdev; 1627 cdp = cdev2priv(dev); 1628 1629 dev_lock(); 1630 cdp->cdp_inuse++; 1631 dev_unlock(); 1632 1633 vhold(vp); 1634 vgone(vp); 1635 vdrop(vp); 1636 1637 VOP_UNLOCK(vp); 1638 loop: 1639 for (;;) { 1640 mtx_lock(&devfs_de_interlock); 1641 dev_lock(); 1642 vp2 = NULL; 1643 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1644 de = cdp->cdp_dirents[i]; 1645 if (de == NULL) 1646 continue; 1647 1648 vp2 = de->de_vnode; 1649 if (vp2 != NULL) { 1650 dev_unlock(); 1651 vs = vget_prep(vp2); 1652 mtx_unlock(&devfs_de_interlock); 1653 if (vget_finish(vp2, LK_EXCLUSIVE, vs) != 0) 1654 goto loop; 1655 vhold(vp2); 1656 vgone(vp2); 1657 vdrop(vp2); 1658 vput(vp2); 1659 break; 1660 } 1661 } 1662 if (vp2 != NULL) { 1663 continue; 1664 } 1665 dev_unlock(); 1666 mtx_unlock(&devfs_de_interlock); 1667 break; 1668 } 1669 dev_lock(); 1670 cdp->cdp_inuse--; 1671 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1672 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1673 dev_unlock(); 1674 dev_rel(&cdp->cdp_c); 1675 } else 1676 dev_unlock(); 1677 1678 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1679 return (0); 1680 } 1681 1682 static int 1683 devfs_rioctl(struct vop_ioctl_args *ap) 1684 { 1685 struct vnode *vp; 1686 struct devfs_mount *dmp; 1687 int error; 1688 1689 vp = ap->a_vp; 1690 vn_lock(vp, LK_SHARED | LK_RETRY); 1691 if (VN_IS_DOOMED(vp)) { 1692 VOP_UNLOCK(vp); 1693 return (EBADF); 1694 } 1695 dmp = VFSTODEVFS(vp->v_mount); 1696 sx_xlock(&dmp->dm_lock); 1697 VOP_UNLOCK(vp); 1698 DEVFS_DMP_HOLD(dmp); 1699 devfs_populate(dmp); 1700 if (DEVFS_DMP_DROP(dmp)) { 1701 sx_xunlock(&dmp->dm_lock); 1702 devfs_unmount_final(dmp); 1703 return (ENOENT); 1704 } 1705 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1706 sx_xunlock(&dmp->dm_lock); 1707 return (error); 1708 } 1709 1710 static int 1711 devfs_rread(struct vop_read_args *ap) 1712 { 1713 1714 if (ap->a_vp->v_type != VDIR) 1715 return (EINVAL); 1716 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1717 } 1718 1719 static int 1720 devfs_setattr(struct vop_setattr_args *ap) 1721 { 1722 struct devfs_dirent *de; 1723 struct vattr *vap; 1724 struct vnode *vp; 1725 struct thread *td; 1726 int c, error; 1727 uid_t uid; 1728 gid_t gid; 1729 1730 vap = ap->a_vap; 1731 vp = ap->a_vp; 1732 td = curthread; 1733 if ((vap->va_type != VNON) || 1734 (vap->va_nlink != VNOVAL) || 1735 (vap->va_fsid != VNOVAL) || 1736 (vap->va_fileid != VNOVAL) || 1737 (vap->va_blocksize != VNOVAL) || 1738 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1739 (vap->va_rdev != VNOVAL) || 1740 ((int)vap->va_bytes != VNOVAL) || 1741 (vap->va_gen != VNOVAL)) { 1742 return (EINVAL); 1743 } 1744 1745 error = devfs_populate_vp(vp); 1746 if (error != 0) 1747 return (error); 1748 1749 de = vp->v_data; 1750 if (vp->v_type == VDIR) 1751 de = de->de_dir; 1752 1753 c = 0; 1754 if (vap->va_uid == (uid_t)VNOVAL) 1755 uid = de->de_uid; 1756 else 1757 uid = vap->va_uid; 1758 if (vap->va_gid == (gid_t)VNOVAL) 1759 gid = de->de_gid; 1760 else 1761 gid = vap->va_gid; 1762 if (uid != de->de_uid || gid != de->de_gid) { 1763 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1764 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1765 error = priv_check(td, PRIV_VFS_CHOWN); 1766 if (error != 0) 1767 goto ret; 1768 } 1769 de->de_uid = uid; 1770 de->de_gid = gid; 1771 c = 1; 1772 } 1773 1774 if (vap->va_mode != (mode_t)VNOVAL) { 1775 if (ap->a_cred->cr_uid != de->de_uid) { 1776 error = priv_check(td, PRIV_VFS_ADMIN); 1777 if (error != 0) 1778 goto ret; 1779 } 1780 de->de_mode = vap->va_mode; 1781 c = 1; 1782 } 1783 1784 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1785 error = vn_utimes_perm(vp, vap, ap->a_cred, td); 1786 if (error != 0) 1787 goto ret; 1788 if (vap->va_atime.tv_sec != VNOVAL) { 1789 if (vp->v_type == VCHR) 1790 vp->v_rdev->si_atime = vap->va_atime; 1791 else 1792 de->de_atime = vap->va_atime; 1793 } 1794 if (vap->va_mtime.tv_sec != VNOVAL) { 1795 if (vp->v_type == VCHR) 1796 vp->v_rdev->si_mtime = vap->va_mtime; 1797 else 1798 de->de_mtime = vap->va_mtime; 1799 } 1800 c = 1; 1801 } 1802 1803 if (c) { 1804 if (vp->v_type == VCHR) 1805 vfs_timestamp(&vp->v_rdev->si_ctime); 1806 else 1807 vfs_timestamp(&de->de_mtime); 1808 } 1809 1810 ret: 1811 sx_xunlock(&VFSTODEVFS(vp->v_mount)->dm_lock); 1812 return (error); 1813 } 1814 1815 #ifdef MAC 1816 static int 1817 devfs_setlabel(struct vop_setlabel_args *ap) 1818 { 1819 struct vnode *vp; 1820 struct devfs_dirent *de; 1821 1822 vp = ap->a_vp; 1823 de = vp->v_data; 1824 1825 mac_vnode_relabel(ap->a_cred, vp, ap->a_label); 1826 mac_devfs_update(vp->v_mount, de, vp); 1827 1828 return (0); 1829 } 1830 #endif 1831 1832 static int 1833 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred) 1834 { 1835 1836 return (vnops.fo_stat(fp, sb, cred)); 1837 } 1838 1839 static int 1840 devfs_symlink(struct vop_symlink_args *ap) 1841 { 1842 int i, error; 1843 struct devfs_dirent *dd; 1844 struct devfs_dirent *de, *de_covered, *de_dotdot; 1845 struct devfs_mount *dmp; 1846 1847 error = priv_check(curthread, PRIV_DEVFS_SYMLINK); 1848 if (error) 1849 return(error); 1850 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1851 if (devfs_populate_vp(ap->a_dvp) != 0) 1852 return (ENOENT); 1853 1854 dd = ap->a_dvp->v_data; 1855 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1856 de->de_flags = DE_USER; 1857 de->de_uid = 0; 1858 de->de_gid = 0; 1859 de->de_mode = 0755; 1860 de->de_inode = alloc_unr(devfs_inos); 1861 de->de_dir = dd; 1862 de->de_dirent->d_type = DT_LNK; 1863 i = strlen(ap->a_target) + 1; 1864 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1865 bcopy(ap->a_target, de->de_symlink, i); 1866 #ifdef MAC 1867 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1868 #endif 1869 de_covered = devfs_find(dd, de->de_dirent->d_name, 1870 de->de_dirent->d_namlen, 0); 1871 if (de_covered != NULL) { 1872 if ((de_covered->de_flags & DE_USER) != 0) { 1873 devfs_delete(dmp, de, DEVFS_DEL_NORECURSE); 1874 sx_xunlock(&dmp->dm_lock); 1875 return (EEXIST); 1876 } 1877 KASSERT((de_covered->de_flags & DE_COVERED) == 0, 1878 ("devfs_symlink: entry %p already covered", de_covered)); 1879 de_covered->de_flags |= DE_COVERED; 1880 } 1881 1882 de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */ 1883 de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */ 1884 TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list); 1885 devfs_dir_ref_de(dmp, dd); 1886 devfs_rules_apply(dmp, de); 1887 1888 return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp)); 1889 } 1890 1891 static int 1892 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) 1893 { 1894 1895 return (vnops.fo_truncate(fp, length, cred, td)); 1896 } 1897 1898 static int 1899 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, 1900 int flags, struct thread *td) 1901 { 1902 struct cdev *dev; 1903 int error, ioflag, ref; 1904 ssize_t resid; 1905 struct cdevsw *dsw; 1906 struct file *fpop; 1907 1908 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1909 return (EINVAL); 1910 fpop = td->td_fpop; 1911 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1912 if (error != 0) { 1913 error = vnops.fo_write(fp, uio, cred, flags, td); 1914 return (error); 1915 } 1916 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1917 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1918 if (ioflag & O_DIRECT) 1919 ioflag |= IO_DIRECT; 1920 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1921 1922 resid = uio->uio_resid; 1923 1924 error = dsw->d_write(dev, uio, ioflag); 1925 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1926 devfs_timestamp(&dev->si_ctime); 1927 dev->si_mtime = dev->si_ctime; 1928 } 1929 td->td_fpop = fpop; 1930 dev_relthread(dev, ref); 1931 1932 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_W); 1933 return (error); 1934 } 1935 1936 static int 1937 devfs_mmap_f(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size, 1938 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff, 1939 struct thread *td) 1940 { 1941 struct cdev *dev; 1942 struct cdevsw *dsw; 1943 struct mount *mp; 1944 struct vnode *vp; 1945 struct file *fpop; 1946 vm_object_t object; 1947 vm_prot_t maxprot; 1948 int error, ref; 1949 1950 vp = fp->f_vnode; 1951 1952 /* 1953 * Ensure that file and memory protections are 1954 * compatible. 1955 */ 1956 mp = vp->v_mount; 1957 if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0) { 1958 maxprot = VM_PROT_NONE; 1959 if ((prot & VM_PROT_EXECUTE) != 0) 1960 return (EACCES); 1961 } else 1962 maxprot = VM_PROT_EXECUTE; 1963 if ((fp->f_flag & FREAD) != 0) 1964 maxprot |= VM_PROT_READ; 1965 else if ((prot & VM_PROT_READ) != 0) 1966 return (EACCES); 1967 1968 /* 1969 * If we are sharing potential changes via MAP_SHARED and we 1970 * are trying to get write permission although we opened it 1971 * without asking for it, bail out. 1972 * 1973 * Note that most character devices always share mappings. 1974 * The one exception is that D_MMAP_ANON devices 1975 * (i.e. /dev/zero) permit private writable mappings. 1976 * 1977 * Rely on vm_mmap_cdev() to fail invalid MAP_PRIVATE requests 1978 * as well as updating maxprot to permit writing for 1979 * D_MMAP_ANON devices rather than doing that here. 1980 */ 1981 if ((flags & MAP_SHARED) != 0) { 1982 if ((fp->f_flag & FWRITE) != 0) 1983 maxprot |= VM_PROT_WRITE; 1984 else if ((prot & VM_PROT_WRITE) != 0) 1985 return (EACCES); 1986 } 1987 maxprot &= cap_maxprot; 1988 1989 fpop = td->td_fpop; 1990 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1991 if (error != 0) 1992 return (error); 1993 1994 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, dev, dsw, &foff, 1995 &object); 1996 td->td_fpop = fpop; 1997 dev_relthread(dev, ref); 1998 if (error != 0) 1999 return (error); 2000 2001 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object, 2002 foff, FALSE, td); 2003 if (error != 0) 2004 vm_object_deallocate(object); 2005 return (error); 2006 } 2007 2008 dev_t 2009 dev2udev(struct cdev *x) 2010 { 2011 if (x == NULL) 2012 return (NODEV); 2013 return (cdev2priv(x)->cdp_inode); 2014 } 2015 2016 static struct fileops devfs_ops_f = { 2017 .fo_read = devfs_read_f, 2018 .fo_write = devfs_write_f, 2019 .fo_truncate = devfs_truncate_f, 2020 .fo_ioctl = devfs_ioctl_f, 2021 .fo_poll = devfs_poll_f, 2022 .fo_kqfilter = devfs_kqfilter_f, 2023 .fo_stat = devfs_stat_f, 2024 .fo_close = devfs_close_f, 2025 .fo_chmod = vn_chmod, 2026 .fo_chown = vn_chown, 2027 .fo_sendfile = vn_sendfile, 2028 .fo_seek = vn_seek, 2029 .fo_fill_kinfo = vn_fill_kinfo, 2030 .fo_mmap = devfs_mmap_f, 2031 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 2032 }; 2033 2034 /* Vops for non-CHR vnodes in /dev. */ 2035 static struct vop_vector devfs_vnodeops = { 2036 .vop_default = &default_vnodeops, 2037 2038 .vop_access = devfs_access, 2039 .vop_getattr = devfs_getattr, 2040 .vop_ioctl = devfs_rioctl, 2041 .vop_lookup = devfs_lookup, 2042 .vop_mknod = devfs_mknod, 2043 .vop_pathconf = devfs_pathconf, 2044 .vop_read = devfs_rread, 2045 .vop_readdir = devfs_readdir, 2046 .vop_readlink = devfs_readlink, 2047 .vop_reclaim = devfs_reclaim, 2048 .vop_remove = devfs_remove, 2049 .vop_revoke = devfs_revoke, 2050 .vop_setattr = devfs_setattr, 2051 #ifdef MAC 2052 .vop_setlabel = devfs_setlabel, 2053 #endif 2054 .vop_symlink = devfs_symlink, 2055 .vop_vptocnp = devfs_vptocnp, 2056 .vop_lock1 = vop_lock, 2057 .vop_unlock = vop_unlock, 2058 .vop_islocked = vop_islocked, 2059 .vop_add_writecount = vop_stdadd_writecount_nomsync, 2060 }; 2061 VFS_VOP_VECTOR_REGISTER(devfs_vnodeops); 2062 2063 /* Vops for VCHR vnodes in /dev. */ 2064 static struct vop_vector devfs_specops = { 2065 .vop_default = &default_vnodeops, 2066 2067 .vop_access = devfs_access, 2068 .vop_bmap = VOP_PANIC, 2069 .vop_close = devfs_close, 2070 .vop_create = VOP_PANIC, 2071 .vop_fsync = vop_stdfsync, 2072 .vop_getattr = devfs_getattr, 2073 .vop_ioctl = devfs_ioctl, 2074 .vop_link = VOP_PANIC, 2075 .vop_mkdir = VOP_PANIC, 2076 .vop_mknod = VOP_PANIC, 2077 .vop_open = devfs_open, 2078 .vop_pathconf = devfs_pathconf, 2079 .vop_poll = dead_poll, 2080 .vop_print = devfs_print, 2081 .vop_read = dead_read, 2082 .vop_readdir = VOP_PANIC, 2083 .vop_readlink = VOP_PANIC, 2084 .vop_reallocblks = VOP_PANIC, 2085 .vop_reclaim = devfs_reclaim_vchr, 2086 .vop_remove = devfs_remove, 2087 .vop_rename = VOP_PANIC, 2088 .vop_revoke = devfs_revoke, 2089 .vop_rmdir = VOP_PANIC, 2090 .vop_setattr = devfs_setattr, 2091 #ifdef MAC 2092 .vop_setlabel = devfs_setlabel, 2093 #endif 2094 .vop_strategy = VOP_PANIC, 2095 .vop_symlink = VOP_PANIC, 2096 .vop_vptocnp = devfs_vptocnp, 2097 .vop_write = dead_write, 2098 .vop_lock1 = vop_lock, 2099 .vop_unlock = vop_unlock, 2100 .vop_islocked = vop_islocked, 2101 .vop_add_writecount = vop_stdadd_writecount_nomsync, 2102 }; 2103 VFS_VOP_VECTOR_REGISTER(devfs_specops); 2104 2105 /* 2106 * Our calling convention to the device drivers used to be that we passed 2107 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 2108 * flags instead since that's what open(), close() and ioctl() takes and 2109 * we don't really want vnode.h in device drivers. 2110 * We solved the source compatibility by redefining some vnode flags to 2111 * be the same as the fcntl ones and by sending down the bitwise OR of 2112 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 2113 * pulls the rug out under this. 2114 */ 2115 CTASSERT(O_NONBLOCK == IO_NDELAY); 2116 CTASSERT(O_FSYNC == IO_SYNC); 2117