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