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 static void 511 devfs_insmntque_dtr(struct vnode *vp, void *arg) 512 { 513 struct devfs_dirent *de; 514 515 de = (struct devfs_dirent *)arg; 516 mtx_lock(&devfs_de_interlock); 517 vp->v_data = NULL; 518 de->de_vnode = NULL; 519 mtx_unlock(&devfs_de_interlock); 520 vgone(vp); 521 vput(vp); 522 } 523 524 /* 525 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops 526 * it on return. 527 */ 528 int 529 devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode, 530 struct vnode **vpp) 531 { 532 int error; 533 struct vnode *vp; 534 struct cdev *dev; 535 struct devfs_mount *dmp; 536 struct cdevsw *dsw; 537 enum vgetstate vs; 538 539 dmp = VFSTODEVFS(mp); 540 if (de->de_flags & DE_DOOMED) { 541 sx_xunlock(&dmp->dm_lock); 542 return (ENOENT); 543 } 544 loop: 545 DEVFS_DE_HOLD(de); 546 DEVFS_DMP_HOLD(dmp); 547 mtx_lock(&devfs_de_interlock); 548 vp = de->de_vnode; 549 if (vp != NULL) { 550 vs = vget_prep(vp); 551 mtx_unlock(&devfs_de_interlock); 552 sx_xunlock(&dmp->dm_lock); 553 vget_finish(vp, lockmode | LK_RETRY, vs); 554 sx_xlock(&dmp->dm_lock); 555 if (devfs_allocv_drop_refs(0, dmp, de)) { 556 vput(vp); 557 return (ENOENT); 558 } 559 else if (VN_IS_DOOMED(vp)) { 560 mtx_lock(&devfs_de_interlock); 561 if (de->de_vnode == vp) { 562 de->de_vnode = NULL; 563 vp->v_data = NULL; 564 } 565 mtx_unlock(&devfs_de_interlock); 566 vput(vp); 567 goto loop; 568 } 569 sx_xunlock(&dmp->dm_lock); 570 *vpp = vp; 571 return (0); 572 } 573 mtx_unlock(&devfs_de_interlock); 574 if (de->de_dirent->d_type == DT_CHR) { 575 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { 576 devfs_allocv_drop_refs(1, dmp, de); 577 return (ENOENT); 578 } 579 dev = &de->de_cdp->cdp_c; 580 } else { 581 dev = NULL; 582 } 583 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 584 if (error != 0) { 585 devfs_allocv_drop_refs(1, dmp, de); 586 printf("devfs_allocv: failed to allocate new vnode\n"); 587 return (error); 588 } 589 590 if (de->de_dirent->d_type == DT_CHR) { 591 vp->v_type = VCHR; 592 VI_LOCK(vp); 593 dev_lock(); 594 dev_refl(dev); 595 /* XXX: v_rdev should be protect by vnode lock */ 596 vp->v_rdev = dev; 597 VNPASS(vp->v_usecount == 1, vp); 598 /* Special casing of ttys for deadfs. Probably redundant. */ 599 dsw = dev->si_devsw; 600 if (dsw != NULL && (dsw->d_flags & D_TTY) != 0) 601 vp->v_vflag |= VV_ISTTY; 602 dev_unlock(); 603 VI_UNLOCK(vp); 604 if ((dev->si_flags & SI_ETERNAL) != 0) 605 vp->v_vflag |= VV_ETERNALDEV; 606 vp->v_op = &devfs_specops; 607 } else if (de->de_dirent->d_type == DT_DIR) { 608 vp->v_type = VDIR; 609 } else if (de->de_dirent->d_type == DT_LNK) { 610 vp->v_type = VLNK; 611 } else { 612 vp->v_type = VBAD; 613 } 614 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS); 615 VN_LOCK_ASHARE(vp); 616 mtx_lock(&devfs_de_interlock); 617 vp->v_data = de; 618 de->de_vnode = vp; 619 mtx_unlock(&devfs_de_interlock); 620 error = insmntque1(vp, mp, devfs_insmntque_dtr, de); 621 if (error != 0) { 622 (void) devfs_allocv_drop_refs(1, dmp, de); 623 return (error); 624 } 625 if (devfs_allocv_drop_refs(0, dmp, de)) { 626 vput(vp); 627 return (ENOENT); 628 } 629 #ifdef MAC 630 mac_devfs_vnode_associate(mp, de, vp); 631 #endif 632 sx_xunlock(&dmp->dm_lock); 633 *vpp = vp; 634 return (0); 635 } 636 637 static int 638 devfs_access(struct vop_access_args *ap) 639 { 640 struct vnode *vp = ap->a_vp; 641 struct devfs_dirent *de; 642 struct proc *p; 643 int error; 644 645 de = vp->v_data; 646 if (vp->v_type == VDIR) 647 de = de->de_dir; 648 649 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 650 ap->a_accmode, ap->a_cred); 651 if (error == 0) 652 return (0); 653 if (error != EACCES) 654 return (error); 655 p = ap->a_td->td_proc; 656 /* We do, however, allow access to the controlling terminal */ 657 PROC_LOCK(p); 658 if (!(p->p_flag & P_CONTROLT)) { 659 PROC_UNLOCK(p); 660 return (error); 661 } 662 if (p->p_session->s_ttydp == de->de_cdp) 663 error = 0; 664 PROC_UNLOCK(p); 665 return (error); 666 } 667 668 _Static_assert(((FMASK | FCNTLFLAGS) & (FLASTCLOSE | FREVOKE)) == 0, 669 "devfs-only flag reuse failed"); 670 671 static int 672 devfs_close(struct vop_close_args *ap) 673 { 674 struct vnode *vp = ap->a_vp, *oldvp; 675 struct thread *td = ap->a_td; 676 struct proc *p; 677 struct cdev *dev = vp->v_rdev; 678 struct cdevsw *dsw; 679 struct devfs_dirent *de = vp->v_data; 680 int dflags, error, ref, vp_locked; 681 682 /* 683 * XXX: Don't call d_close() if we were called because of 684 * XXX: insmntque1() failure. 685 */ 686 if (vp->v_data == NULL) 687 return (0); 688 689 /* 690 * Hack: a tty device that is a controlling terminal 691 * has a reference from the session structure. 692 * We cannot easily tell that a character device is 693 * a controlling terminal, unless it is the closing 694 * process' controlling terminal. In that case, 695 * if the reference count is 2 (this last descriptor 696 * plus the session), release the reference from the session. 697 */ 698 if (de->de_usecount == 2 && td != NULL) { 699 p = td->td_proc; 700 PROC_LOCK(p); 701 if (vp == p->p_session->s_ttyvp) { 702 PROC_UNLOCK(p); 703 oldvp = NULL; 704 sx_xlock(&proctree_lock); 705 if (vp == p->p_session->s_ttyvp) { 706 SESS_LOCK(p->p_session); 707 mtx_lock(&devfs_de_interlock); 708 VI_LOCK(vp); 709 if (devfs_usecountl(vp) == 2 && !VN_IS_DOOMED(vp)) { 710 p->p_session->s_ttyvp = NULL; 711 p->p_session->s_ttydp = NULL; 712 oldvp = vp; 713 } 714 VI_UNLOCK(vp); 715 mtx_unlock(&devfs_de_interlock); 716 SESS_UNLOCK(p->p_session); 717 } 718 sx_xunlock(&proctree_lock); 719 if (oldvp != NULL) 720 devfs_ctty_unref(oldvp); 721 } else 722 PROC_UNLOCK(p); 723 } 724 /* 725 * We do not want to really close the device if it 726 * is still in use unless we are trying to close it 727 * forcibly. Since every use (buffer, vnode, swap, cmap) 728 * holds a reference to the vnode, and because we mark 729 * any other vnodes that alias this device, when the 730 * sum of the reference counts on all the aliased 731 * vnodes descends to one, we are on last close. 732 */ 733 dsw = dev_refthread(dev, &ref); 734 if (dsw == NULL) 735 return (ENXIO); 736 dflags = 0; 737 mtx_lock(&devfs_de_interlock); 738 VI_LOCK(vp); 739 if (devfs_usecountl(vp) == 1) 740 dflags |= FLASTCLOSE; 741 devfs_usecount_subl(vp); 742 mtx_unlock(&devfs_de_interlock); 743 if (VN_IS_DOOMED(vp)) { 744 /* Forced close. */ 745 dflags |= FREVOKE | FNONBLOCK; 746 } else if (dsw->d_flags & D_TRACKCLOSE) { 747 /* Keep device updated on status. */ 748 } else if ((dflags & FLASTCLOSE) == 0) { 749 VI_UNLOCK(vp); 750 dev_relthread(dev, ref); 751 return (0); 752 } 753 vholdnz(vp); 754 VI_UNLOCK(vp); 755 vp_locked = VOP_ISLOCKED(vp); 756 VOP_UNLOCK(vp); 757 KASSERT(dev->si_refcount > 0, 758 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 759 error = dsw->d_close(dev, ap->a_fflag | dflags, S_IFCHR, td); 760 dev_relthread(dev, ref); 761 vn_lock(vp, vp_locked | LK_RETRY); 762 vdrop(vp); 763 return (error); 764 } 765 766 static int 767 devfs_close_f(struct file *fp, struct thread *td) 768 { 769 int error; 770 struct file *fpop; 771 772 /* 773 * NB: td may be NULL if this descriptor is closed due to 774 * garbage collection from a closed UNIX domain socket. 775 */ 776 fpop = curthread->td_fpop; 777 curthread->td_fpop = fp; 778 error = vnops.fo_close(fp, td); 779 curthread->td_fpop = fpop; 780 781 /* 782 * The f_cdevpriv cannot be assigned non-NULL value while we 783 * are destroying the file. 784 */ 785 if (fp->f_cdevpriv != NULL) 786 devfs_fpdrop(fp); 787 return (error); 788 } 789 790 static int 791 devfs_getattr(struct vop_getattr_args *ap) 792 { 793 struct vnode *vp = ap->a_vp; 794 struct vattr *vap = ap->a_vap; 795 struct devfs_dirent *de; 796 struct devfs_mount *dmp; 797 struct cdev *dev; 798 struct timeval boottime; 799 int error; 800 801 error = devfs_populate_vp(vp); 802 if (error != 0) 803 return (error); 804 805 dmp = VFSTODEVFS(vp->v_mount); 806 sx_xunlock(&dmp->dm_lock); 807 808 de = vp->v_data; 809 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 810 if (vp->v_type == VDIR) { 811 de = de->de_dir; 812 KASSERT(de != NULL, 813 ("Null dir dirent in devfs_getattr vp=%p", vp)); 814 } 815 vap->va_uid = de->de_uid; 816 vap->va_gid = de->de_gid; 817 vap->va_mode = de->de_mode; 818 if (vp->v_type == VLNK) 819 vap->va_size = strlen(de->de_symlink); 820 else if (vp->v_type == VDIR) 821 vap->va_size = vap->va_bytes = DEV_BSIZE; 822 else 823 vap->va_size = 0; 824 if (vp->v_type != VDIR) 825 vap->va_bytes = 0; 826 vap->va_blocksize = DEV_BSIZE; 827 vap->va_type = vp->v_type; 828 829 getboottime(&boottime); 830 #define fix(aa) \ 831 do { \ 832 if ((aa).tv_sec <= 3600) { \ 833 (aa).tv_sec = boottime.tv_sec; \ 834 (aa).tv_nsec = boottime.tv_usec * 1000; \ 835 } \ 836 } while (0) 837 838 if (vp->v_type != VCHR) { 839 fix(de->de_atime); 840 vap->va_atime = de->de_atime; 841 fix(de->de_mtime); 842 vap->va_mtime = de->de_mtime; 843 fix(de->de_ctime); 844 vap->va_ctime = de->de_ctime; 845 } else { 846 dev = vp->v_rdev; 847 fix(dev->si_atime); 848 vap->va_atime = dev->si_atime; 849 fix(dev->si_mtime); 850 vap->va_mtime = dev->si_mtime; 851 fix(dev->si_ctime); 852 vap->va_ctime = dev->si_ctime; 853 854 vap->va_rdev = cdev2priv(dev)->cdp_inode; 855 } 856 vap->va_gen = 0; 857 vap->va_flags = 0; 858 vap->va_filerev = 0; 859 vap->va_nlink = de->de_links; 860 vap->va_fileid = de->de_inode; 861 862 return (error); 863 } 864 865 /* ARGSUSED */ 866 static int 867 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 868 { 869 struct file *fpop; 870 int error; 871 872 fpop = td->td_fpop; 873 td->td_fpop = fp; 874 error = vnops.fo_ioctl(fp, com, data, cred, td); 875 td->td_fpop = fpop; 876 return (error); 877 } 878 879 void * 880 fiodgname_buf_get_ptr(void *fgnp, u_long com) 881 { 882 union { 883 struct fiodgname_arg fgn; 884 #ifdef COMPAT_FREEBSD32 885 struct fiodgname_arg32 fgn32; 886 #endif 887 } *fgnup; 888 889 fgnup = fgnp; 890 switch (com) { 891 case FIODGNAME: 892 return (fgnup->fgn.buf); 893 #ifdef COMPAT_FREEBSD32 894 case FIODGNAME_32: 895 return ((void *)(uintptr_t)fgnup->fgn32.buf); 896 #endif 897 default: 898 panic("Unhandled ioctl command %ld", com); 899 } 900 } 901 902 static int 903 devfs_ioctl(struct vop_ioctl_args *ap) 904 { 905 struct fiodgname_arg *fgn; 906 struct vnode *vpold, *vp; 907 struct cdevsw *dsw; 908 struct thread *td; 909 struct session *sess; 910 struct cdev *dev; 911 int error, ref, i; 912 const char *p; 913 u_long com; 914 915 vp = ap->a_vp; 916 com = ap->a_command; 917 td = ap->a_td; 918 919 dsw = devvn_refthread(vp, &dev, &ref); 920 if (dsw == NULL) 921 return (ENXIO); 922 KASSERT(dev->si_refcount > 0, 923 ("devfs: un-referenced struct cdev *(%s)", devtoname(dev))); 924 925 switch (com) { 926 case FIODTYPE: 927 *(int *)ap->a_data = dsw->d_flags & D_TYPEMASK; 928 error = 0; 929 break; 930 case FIODGNAME: 931 #ifdef COMPAT_FREEBSD32 932 case FIODGNAME_32: 933 #endif 934 fgn = ap->a_data; 935 p = devtoname(dev); 936 i = strlen(p) + 1; 937 if (i > fgn->len) 938 error = EINVAL; 939 else 940 error = copyout(p, fiodgname_buf_get_ptr(fgn, com), i); 941 break; 942 default: 943 error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td); 944 } 945 946 dev_relthread(dev, ref); 947 if (error == ENOIOCTL) 948 error = ENOTTY; 949 950 if (error == 0 && com == TIOCSCTTY) { 951 /* 952 * Do nothing if reassigning same control tty, or if the 953 * control tty has already disappeared. If it disappeared, 954 * it's because we were racing with TIOCNOTTY. TIOCNOTTY 955 * already took care of releasing the old vnode and we have 956 * nothing left to do. 957 */ 958 sx_slock(&proctree_lock); 959 sess = td->td_proc->p_session; 960 if (sess->s_ttyvp == vp || sess->s_ttyp == NULL) { 961 sx_sunlock(&proctree_lock); 962 return (0); 963 } 964 965 devfs_ctty_ref(vp); 966 SESS_LOCK(sess); 967 vpold = sess->s_ttyvp; 968 sess->s_ttyvp = vp; 969 sess->s_ttydp = cdev2priv(dev); 970 SESS_UNLOCK(sess); 971 972 sx_sunlock(&proctree_lock); 973 974 /* Get rid of reference to old control tty */ 975 if (vpold) 976 devfs_ctty_unref(vpold); 977 } 978 return (error); 979 } 980 981 /* ARGSUSED */ 982 static int 983 devfs_kqfilter_f(struct file *fp, struct knote *kn) 984 { 985 struct cdev *dev; 986 struct cdevsw *dsw; 987 int error, ref; 988 struct file *fpop; 989 struct thread *td; 990 991 td = curthread; 992 fpop = td->td_fpop; 993 error = devfs_fp_check(fp, &dev, &dsw, &ref); 994 if (error) 995 return (error); 996 error = dsw->d_kqfilter(dev, kn); 997 td->td_fpop = fpop; 998 dev_relthread(dev, ref); 999 return (error); 1000 } 1001 1002 static inline int 1003 devfs_prison_check(struct devfs_dirent *de, struct thread *td) 1004 { 1005 struct cdev_priv *cdp; 1006 struct ucred *dcr; 1007 struct proc *p; 1008 int error; 1009 1010 cdp = de->de_cdp; 1011 if (cdp == NULL) 1012 return (0); 1013 dcr = cdp->cdp_c.si_cred; 1014 if (dcr == NULL) 1015 return (0); 1016 1017 error = prison_check(td->td_ucred, dcr); 1018 if (error == 0) 1019 return (0); 1020 /* We do, however, allow access to the controlling terminal */ 1021 p = td->td_proc; 1022 PROC_LOCK(p); 1023 if (!(p->p_flag & P_CONTROLT)) { 1024 PROC_UNLOCK(p); 1025 return (error); 1026 } 1027 if (p->p_session->s_ttydp == cdp) 1028 error = 0; 1029 PROC_UNLOCK(p); 1030 return (error); 1031 } 1032 1033 static int 1034 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 1035 { 1036 struct componentname *cnp; 1037 struct vnode *dvp, **vpp; 1038 struct thread *td; 1039 struct devfs_dirent *de, *dd; 1040 struct devfs_dirent **dde; 1041 struct devfs_mount *dmp; 1042 struct mount *mp; 1043 struct cdev *cdev; 1044 int error, flags, nameiop, dvplocked; 1045 char specname[SPECNAMELEN + 1], *pname; 1046 1047 cnp = ap->a_cnp; 1048 vpp = ap->a_vpp; 1049 dvp = ap->a_dvp; 1050 pname = cnp->cn_nameptr; 1051 td = cnp->cn_thread; 1052 flags = cnp->cn_flags; 1053 nameiop = cnp->cn_nameiop; 1054 mp = dvp->v_mount; 1055 dmp = VFSTODEVFS(mp); 1056 dd = dvp->v_data; 1057 *vpp = NULLVP; 1058 1059 if ((flags & ISLASTCN) && nameiop == RENAME) 1060 return (EOPNOTSUPP); 1061 1062 if (dvp->v_type != VDIR) 1063 return (ENOTDIR); 1064 1065 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 1066 return (EIO); 1067 1068 error = vn_dir_check_exec(dvp, cnp); 1069 if (error != 0) 1070 return (error); 1071 1072 if (cnp->cn_namelen == 1 && *pname == '.') { 1073 if ((flags & ISLASTCN) && nameiop != LOOKUP) 1074 return (EINVAL); 1075 *vpp = dvp; 1076 VREF(dvp); 1077 return (0); 1078 } 1079 1080 if (flags & ISDOTDOT) { 1081 if ((flags & ISLASTCN) && nameiop != LOOKUP) 1082 return (EINVAL); 1083 de = devfs_parent_dirent(dd); 1084 if (de == NULL) 1085 return (ENOENT); 1086 dvplocked = VOP_ISLOCKED(dvp); 1087 VOP_UNLOCK(dvp); 1088 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, 1089 vpp); 1090 *dm_unlock = 0; 1091 vn_lock(dvp, dvplocked | LK_RETRY); 1092 return (error); 1093 } 1094 1095 dd = dvp->v_data; 1096 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0); 1097 while (de == NULL) { /* While(...) so we can use break */ 1098 1099 if (nameiop == DELETE) 1100 return (ENOENT); 1101 1102 /* 1103 * OK, we didn't have an entry for the name we were asked for 1104 * so we try to see if anybody can create it on demand. 1105 */ 1106 pname = devfs_fqpn(specname, dmp, dd, cnp); 1107 if (pname == NULL) 1108 break; 1109 1110 cdev = NULL; 1111 DEVFS_DMP_HOLD(dmp); 1112 sx_xunlock(&dmp->dm_lock); 1113 sx_slock(&clone_drain_lock); 1114 EVENTHANDLER_INVOKE(dev_clone, 1115 td->td_ucred, pname, strlen(pname), &cdev); 1116 sx_sunlock(&clone_drain_lock); 1117 1118 if (cdev == NULL) 1119 sx_xlock(&dmp->dm_lock); 1120 else if (devfs_populate_vp(dvp) != 0) { 1121 *dm_unlock = 0; 1122 sx_xlock(&dmp->dm_lock); 1123 if (DEVFS_DMP_DROP(dmp)) { 1124 sx_xunlock(&dmp->dm_lock); 1125 devfs_unmount_final(dmp); 1126 } else 1127 sx_xunlock(&dmp->dm_lock); 1128 dev_rel(cdev); 1129 return (ENOENT); 1130 } 1131 if (DEVFS_DMP_DROP(dmp)) { 1132 *dm_unlock = 0; 1133 sx_xunlock(&dmp->dm_lock); 1134 devfs_unmount_final(dmp); 1135 if (cdev != NULL) 1136 dev_rel(cdev); 1137 return (ENOENT); 1138 } 1139 1140 if (cdev == NULL) 1141 break; 1142 1143 dev_lock(); 1144 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx]; 1145 if (dde != NULL && *dde != NULL) 1146 de = *dde; 1147 dev_unlock(); 1148 dev_rel(cdev); 1149 break; 1150 } 1151 1152 if (de == NULL || de->de_flags & DE_WHITEOUT) { 1153 if ((nameiop == CREATE || nameiop == RENAME) && 1154 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 1155 cnp->cn_flags |= SAVENAME; 1156 return (EJUSTRETURN); 1157 } 1158 return (ENOENT); 1159 } 1160 1161 if (devfs_prison_check(de, td)) 1162 return (ENOENT); 1163 1164 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 1165 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 1166 if (error) 1167 return (error); 1168 if (*vpp == dvp) { 1169 VREF(dvp); 1170 *vpp = dvp; 1171 return (0); 1172 } 1173 } 1174 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, vpp); 1175 *dm_unlock = 0; 1176 return (error); 1177 } 1178 1179 static int 1180 devfs_lookup(struct vop_lookup_args *ap) 1181 { 1182 int j; 1183 struct devfs_mount *dmp; 1184 int dm_unlock; 1185 1186 if (devfs_populate_vp(ap->a_dvp) != 0) 1187 return (ENOTDIR); 1188 1189 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1190 dm_unlock = 1; 1191 j = devfs_lookupx(ap, &dm_unlock); 1192 if (dm_unlock == 1) 1193 sx_xunlock(&dmp->dm_lock); 1194 return (j); 1195 } 1196 1197 static int 1198 devfs_mknod(struct vop_mknod_args *ap) 1199 { 1200 struct componentname *cnp; 1201 struct vnode *dvp, **vpp; 1202 struct devfs_dirent *dd, *de; 1203 struct devfs_mount *dmp; 1204 int error; 1205 1206 /* 1207 * The only type of node we should be creating here is a 1208 * character device, for anything else return EOPNOTSUPP. 1209 */ 1210 if (ap->a_vap->va_type != VCHR) 1211 return (EOPNOTSUPP); 1212 dvp = ap->a_dvp; 1213 dmp = VFSTODEVFS(dvp->v_mount); 1214 1215 cnp = ap->a_cnp; 1216 vpp = ap->a_vpp; 1217 dd = dvp->v_data; 1218 1219 error = ENOENT; 1220 sx_xlock(&dmp->dm_lock); 1221 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 1222 if (cnp->cn_namelen != de->de_dirent->d_namlen) 1223 continue; 1224 if (de->de_dirent->d_type == DT_CHR && 1225 (de->de_cdp->cdp_flags & CDP_ACTIVE) == 0) 1226 continue; 1227 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 1228 de->de_dirent->d_namlen) != 0) 1229 continue; 1230 if (de->de_flags & DE_WHITEOUT) 1231 break; 1232 goto notfound; 1233 } 1234 if (de == NULL) 1235 goto notfound; 1236 de->de_flags &= ~DE_WHITEOUT; 1237 error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp); 1238 return (error); 1239 notfound: 1240 sx_xunlock(&dmp->dm_lock); 1241 return (error); 1242 } 1243 1244 /* ARGSUSED */ 1245 static int 1246 devfs_open(struct vop_open_args *ap) 1247 { 1248 struct thread *td = ap->a_td; 1249 struct vnode *vp = ap->a_vp; 1250 struct cdev *dev = vp->v_rdev; 1251 struct file *fp = ap->a_fp; 1252 int error, ref, vlocked; 1253 struct cdevsw *dsw; 1254 struct file *fpop; 1255 1256 if (vp->v_type == VBLK) 1257 return (ENXIO); 1258 1259 if (dev == NULL) 1260 return (ENXIO); 1261 1262 /* Make this field valid before any I/O in d_open. */ 1263 if (dev->si_iosize_max == 0) 1264 dev->si_iosize_max = DFLTPHYS; 1265 1266 dsw = dev_refthread(dev, &ref); 1267 if (dsw == NULL) 1268 return (ENXIO); 1269 if (fp == NULL && dsw->d_fdopen != NULL) { 1270 dev_relthread(dev, ref); 1271 return (ENXIO); 1272 } 1273 1274 if (vp->v_type == VCHR) 1275 devfs_usecount_add(vp); 1276 1277 vlocked = VOP_ISLOCKED(vp); 1278 VOP_UNLOCK(vp); 1279 1280 fpop = td->td_fpop; 1281 td->td_fpop = fp; 1282 if (fp != NULL) { 1283 fp->f_data = dev; 1284 fp->f_vnode = vp; 1285 } 1286 if (dsw->d_fdopen != NULL) 1287 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 1288 else 1289 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 1290 /* Clean up any cdevpriv upon error. */ 1291 if (error != 0) 1292 devfs_clear_cdevpriv(); 1293 td->td_fpop = fpop; 1294 1295 vn_lock(vp, vlocked | LK_RETRY); 1296 if (error != 0 && vp->v_type == VCHR) 1297 devfs_usecount_sub(vp); 1298 1299 dev_relthread(dev, ref); 1300 if (error != 0) { 1301 if (error == ERESTART) 1302 error = EINTR; 1303 return (error); 1304 } 1305 1306 #if 0 /* /dev/console */ 1307 KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp")); 1308 #else 1309 if (fp == NULL) 1310 return (error); 1311 #endif 1312 if (fp->f_ops == &badfileops) 1313 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f); 1314 return (error); 1315 } 1316 1317 static int 1318 devfs_pathconf(struct vop_pathconf_args *ap) 1319 { 1320 1321 switch (ap->a_name) { 1322 case _PC_FILESIZEBITS: 1323 *ap->a_retval = 64; 1324 return (0); 1325 case _PC_NAME_MAX: 1326 *ap->a_retval = NAME_MAX; 1327 return (0); 1328 case _PC_LINK_MAX: 1329 *ap->a_retval = INT_MAX; 1330 return (0); 1331 case _PC_SYMLINK_MAX: 1332 *ap->a_retval = MAXPATHLEN; 1333 return (0); 1334 case _PC_MAX_CANON: 1335 if (ap->a_vp->v_vflag & VV_ISTTY) { 1336 *ap->a_retval = MAX_CANON; 1337 return (0); 1338 } 1339 return (EINVAL); 1340 case _PC_MAX_INPUT: 1341 if (ap->a_vp->v_vflag & VV_ISTTY) { 1342 *ap->a_retval = MAX_INPUT; 1343 return (0); 1344 } 1345 return (EINVAL); 1346 case _PC_VDISABLE: 1347 if (ap->a_vp->v_vflag & VV_ISTTY) { 1348 *ap->a_retval = _POSIX_VDISABLE; 1349 return (0); 1350 } 1351 return (EINVAL); 1352 case _PC_MAC_PRESENT: 1353 #ifdef MAC 1354 /* 1355 * If MAC is enabled, devfs automatically supports 1356 * trivial non-persistant label storage. 1357 */ 1358 *ap->a_retval = 1; 1359 #else 1360 *ap->a_retval = 0; 1361 #endif 1362 return (0); 1363 case _PC_CHOWN_RESTRICTED: 1364 *ap->a_retval = 1; 1365 return (0); 1366 default: 1367 return (vop_stdpathconf(ap)); 1368 } 1369 /* NOTREACHED */ 1370 } 1371 1372 /* ARGSUSED */ 1373 static int 1374 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 1375 { 1376 struct cdev *dev; 1377 struct cdevsw *dsw; 1378 int error, ref; 1379 struct file *fpop; 1380 1381 fpop = td->td_fpop; 1382 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1383 if (error != 0) { 1384 error = vnops.fo_poll(fp, events, cred, td); 1385 return (error); 1386 } 1387 error = dsw->d_poll(dev, events, td); 1388 td->td_fpop = fpop; 1389 dev_relthread(dev, ref); 1390 return(error); 1391 } 1392 1393 /* 1394 * Print out the contents of a special device vnode. 1395 */ 1396 static int 1397 devfs_print(struct vop_print_args *ap) 1398 { 1399 1400 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 1401 return (0); 1402 } 1403 1404 static int 1405 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, 1406 int flags, struct thread *td) 1407 { 1408 struct cdev *dev; 1409 int ioflag, error, ref; 1410 ssize_t resid; 1411 struct cdevsw *dsw; 1412 struct file *fpop; 1413 1414 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1415 return (EINVAL); 1416 fpop = td->td_fpop; 1417 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1418 if (error != 0) { 1419 error = vnops.fo_read(fp, uio, cred, flags, td); 1420 return (error); 1421 } 1422 resid = uio->uio_resid; 1423 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 1424 if (ioflag & O_DIRECT) 1425 ioflag |= IO_DIRECT; 1426 1427 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1428 error = dsw->d_read(dev, uio, ioflag); 1429 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 1430 devfs_timestamp(&dev->si_atime); 1431 td->td_fpop = fpop; 1432 dev_relthread(dev, ref); 1433 1434 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_R); 1435 return (error); 1436 } 1437 1438 static int 1439 devfs_readdir(struct vop_readdir_args *ap) 1440 { 1441 int error; 1442 struct uio *uio; 1443 struct dirent *dp; 1444 struct devfs_dirent *dd; 1445 struct devfs_dirent *de; 1446 struct devfs_mount *dmp; 1447 off_t off; 1448 int *tmp_ncookies = NULL; 1449 1450 if (ap->a_vp->v_type != VDIR) 1451 return (ENOTDIR); 1452 1453 uio = ap->a_uio; 1454 if (uio->uio_offset < 0) 1455 return (EINVAL); 1456 1457 /* 1458 * XXX: This is a temporary hack to get around this filesystem not 1459 * supporting cookies. We store the location of the ncookies pointer 1460 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 1461 * and set the number of cookies to 0. We then set the pointer to 1462 * NULL so that vfs_read_dirent doesn't try to call realloc() on 1463 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 1464 * pointer to its original location before returning to the caller. 1465 */ 1466 if (ap->a_ncookies != NULL) { 1467 tmp_ncookies = ap->a_ncookies; 1468 *ap->a_ncookies = 0; 1469 ap->a_ncookies = NULL; 1470 } 1471 1472 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1473 if (devfs_populate_vp(ap->a_vp) != 0) { 1474 if (tmp_ncookies != NULL) 1475 ap->a_ncookies = tmp_ncookies; 1476 return (EIO); 1477 } 1478 error = 0; 1479 de = ap->a_vp->v_data; 1480 off = 0; 1481 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 1482 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 1483 if (dd->de_flags & (DE_COVERED | DE_WHITEOUT)) 1484 continue; 1485 if (devfs_prison_check(dd, uio->uio_td)) 1486 continue; 1487 if (dd->de_dirent->d_type == DT_DIR) 1488 de = dd->de_dir; 1489 else 1490 de = dd; 1491 dp = dd->de_dirent; 1492 MPASS(dp->d_reclen == GENERIC_DIRSIZ(dp)); 1493 if (dp->d_reclen > uio->uio_resid) 1494 break; 1495 dp->d_fileno = de->de_inode; 1496 /* NOTE: d_off is the offset for the *next* entry. */ 1497 dp->d_off = off + dp->d_reclen; 1498 if (off >= uio->uio_offset) { 1499 error = vfs_read_dirent(ap, dp, off); 1500 if (error) 1501 break; 1502 } 1503 off += dp->d_reclen; 1504 } 1505 sx_xunlock(&dmp->dm_lock); 1506 uio->uio_offset = off; 1507 1508 /* 1509 * Restore ap->a_ncookies if it wasn't originally NULL in the first 1510 * place. 1511 */ 1512 if (tmp_ncookies != NULL) 1513 ap->a_ncookies = tmp_ncookies; 1514 1515 return (error); 1516 } 1517 1518 static int 1519 devfs_readlink(struct vop_readlink_args *ap) 1520 { 1521 struct devfs_dirent *de; 1522 1523 de = ap->a_vp->v_data; 1524 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 1525 } 1526 1527 static void 1528 devfs_reclaiml(struct vnode *vp) 1529 { 1530 struct devfs_dirent *de; 1531 1532 mtx_assert(&devfs_de_interlock, MA_OWNED); 1533 de = vp->v_data; 1534 if (de != NULL) { 1535 MPASS(de->de_usecount == 0); 1536 de->de_vnode = NULL; 1537 vp->v_data = NULL; 1538 } 1539 } 1540 1541 static int 1542 devfs_reclaim(struct vop_reclaim_args *ap) 1543 { 1544 struct vnode *vp; 1545 1546 vp = ap->a_vp; 1547 mtx_lock(&devfs_de_interlock); 1548 devfs_reclaiml(vp); 1549 mtx_unlock(&devfs_de_interlock); 1550 return (0); 1551 } 1552 1553 static int 1554 devfs_reclaim_vchr(struct vop_reclaim_args *ap) 1555 { 1556 struct vnode *vp; 1557 struct cdev *dev; 1558 1559 vp = ap->a_vp; 1560 MPASS(vp->v_type == VCHR); 1561 1562 mtx_lock(&devfs_de_interlock); 1563 VI_LOCK(vp); 1564 devfs_usecount_subl(vp); 1565 devfs_reclaiml(vp); 1566 mtx_unlock(&devfs_de_interlock); 1567 dev_lock(); 1568 dev = vp->v_rdev; 1569 vp->v_rdev = NULL; 1570 dev_unlock(); 1571 VI_UNLOCK(vp); 1572 if (dev != NULL) 1573 dev_rel(dev); 1574 return (0); 1575 } 1576 1577 static int 1578 devfs_remove(struct vop_remove_args *ap) 1579 { 1580 struct vnode *dvp = ap->a_dvp; 1581 struct vnode *vp = ap->a_vp; 1582 struct devfs_dirent *dd; 1583 struct devfs_dirent *de, *de_covered; 1584 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1585 1586 ASSERT_VOP_ELOCKED(dvp, "devfs_remove"); 1587 ASSERT_VOP_ELOCKED(vp, "devfs_remove"); 1588 1589 sx_xlock(&dmp->dm_lock); 1590 dd = ap->a_dvp->v_data; 1591 de = vp->v_data; 1592 if (de->de_cdp == NULL) { 1593 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1594 if (de->de_dirent->d_type == DT_LNK) { 1595 de_covered = devfs_find(dd, de->de_dirent->d_name, 1596 de->de_dirent->d_namlen, 0); 1597 if (de_covered != NULL) 1598 de_covered->de_flags &= ~DE_COVERED; 1599 } 1600 /* We need to unlock dvp because devfs_delete() may lock it. */ 1601 VOP_UNLOCK(vp); 1602 if (dvp != vp) 1603 VOP_UNLOCK(dvp); 1604 devfs_delete(dmp, de, 0); 1605 sx_xunlock(&dmp->dm_lock); 1606 if (dvp != vp) 1607 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1608 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1609 } else { 1610 de->de_flags |= DE_WHITEOUT; 1611 sx_xunlock(&dmp->dm_lock); 1612 } 1613 return (0); 1614 } 1615 1616 /* 1617 * Revoke is called on a tty when a terminal session ends. The vnode 1618 * is orphaned by setting v_op to deadfs so we need to let go of it 1619 * as well so that we create a new one next time around. 1620 * 1621 */ 1622 static int 1623 devfs_revoke(struct vop_revoke_args *ap) 1624 { 1625 struct vnode *vp = ap->a_vp, *vp2; 1626 struct cdev *dev; 1627 struct cdev_priv *cdp; 1628 struct devfs_dirent *de; 1629 enum vgetstate vs; 1630 u_int i; 1631 1632 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1633 1634 dev = vp->v_rdev; 1635 cdp = cdev2priv(dev); 1636 1637 dev_lock(); 1638 cdp->cdp_inuse++; 1639 dev_unlock(); 1640 1641 vhold(vp); 1642 vgone(vp); 1643 vdrop(vp); 1644 1645 VOP_UNLOCK(vp); 1646 loop: 1647 for (;;) { 1648 mtx_lock(&devfs_de_interlock); 1649 dev_lock(); 1650 vp2 = NULL; 1651 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1652 de = cdp->cdp_dirents[i]; 1653 if (de == NULL) 1654 continue; 1655 1656 vp2 = de->de_vnode; 1657 if (vp2 != NULL) { 1658 dev_unlock(); 1659 vs = vget_prep(vp2); 1660 mtx_unlock(&devfs_de_interlock); 1661 if (vget_finish(vp2, LK_EXCLUSIVE, vs) != 0) 1662 goto loop; 1663 vhold(vp2); 1664 vgone(vp2); 1665 vdrop(vp2); 1666 vput(vp2); 1667 break; 1668 } 1669 } 1670 if (vp2 != NULL) { 1671 continue; 1672 } 1673 dev_unlock(); 1674 mtx_unlock(&devfs_de_interlock); 1675 break; 1676 } 1677 dev_lock(); 1678 cdp->cdp_inuse--; 1679 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1680 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1681 dev_unlock(); 1682 dev_rel(&cdp->cdp_c); 1683 } else 1684 dev_unlock(); 1685 1686 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1687 return (0); 1688 } 1689 1690 static int 1691 devfs_rioctl(struct vop_ioctl_args *ap) 1692 { 1693 struct vnode *vp; 1694 struct devfs_mount *dmp; 1695 int error; 1696 1697 vp = ap->a_vp; 1698 vn_lock(vp, LK_SHARED | LK_RETRY); 1699 if (VN_IS_DOOMED(vp)) { 1700 VOP_UNLOCK(vp); 1701 return (EBADF); 1702 } 1703 dmp = VFSTODEVFS(vp->v_mount); 1704 sx_xlock(&dmp->dm_lock); 1705 VOP_UNLOCK(vp); 1706 DEVFS_DMP_HOLD(dmp); 1707 devfs_populate(dmp); 1708 if (DEVFS_DMP_DROP(dmp)) { 1709 sx_xunlock(&dmp->dm_lock); 1710 devfs_unmount_final(dmp); 1711 return (ENOENT); 1712 } 1713 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1714 sx_xunlock(&dmp->dm_lock); 1715 return (error); 1716 } 1717 1718 static int 1719 devfs_rread(struct vop_read_args *ap) 1720 { 1721 1722 if (ap->a_vp->v_type != VDIR) 1723 return (EINVAL); 1724 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1725 } 1726 1727 static int 1728 devfs_setattr(struct vop_setattr_args *ap) 1729 { 1730 struct devfs_dirent *de; 1731 struct vattr *vap; 1732 struct vnode *vp; 1733 struct thread *td; 1734 int c, error; 1735 uid_t uid; 1736 gid_t gid; 1737 1738 vap = ap->a_vap; 1739 vp = ap->a_vp; 1740 td = curthread; 1741 if ((vap->va_type != VNON) || 1742 (vap->va_nlink != VNOVAL) || 1743 (vap->va_fsid != VNOVAL) || 1744 (vap->va_fileid != VNOVAL) || 1745 (vap->va_blocksize != VNOVAL) || 1746 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1747 (vap->va_rdev != VNOVAL) || 1748 ((int)vap->va_bytes != VNOVAL) || 1749 (vap->va_gen != VNOVAL)) { 1750 return (EINVAL); 1751 } 1752 1753 error = devfs_populate_vp(vp); 1754 if (error != 0) 1755 return (error); 1756 1757 de = vp->v_data; 1758 if (vp->v_type == VDIR) 1759 de = de->de_dir; 1760 1761 c = 0; 1762 if (vap->va_uid == (uid_t)VNOVAL) 1763 uid = de->de_uid; 1764 else 1765 uid = vap->va_uid; 1766 if (vap->va_gid == (gid_t)VNOVAL) 1767 gid = de->de_gid; 1768 else 1769 gid = vap->va_gid; 1770 if (uid != de->de_uid || gid != de->de_gid) { 1771 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1772 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1773 error = priv_check(td, PRIV_VFS_CHOWN); 1774 if (error != 0) 1775 goto ret; 1776 } 1777 de->de_uid = uid; 1778 de->de_gid = gid; 1779 c = 1; 1780 } 1781 1782 if (vap->va_mode != (mode_t)VNOVAL) { 1783 if (ap->a_cred->cr_uid != de->de_uid) { 1784 error = priv_check(td, PRIV_VFS_ADMIN); 1785 if (error != 0) 1786 goto ret; 1787 } 1788 de->de_mode = vap->va_mode; 1789 c = 1; 1790 } 1791 1792 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1793 error = vn_utimes_perm(vp, vap, ap->a_cred, td); 1794 if (error != 0) 1795 goto ret; 1796 if (vap->va_atime.tv_sec != VNOVAL) { 1797 if (vp->v_type == VCHR) 1798 vp->v_rdev->si_atime = vap->va_atime; 1799 else 1800 de->de_atime = vap->va_atime; 1801 } 1802 if (vap->va_mtime.tv_sec != VNOVAL) { 1803 if (vp->v_type == VCHR) 1804 vp->v_rdev->si_mtime = vap->va_mtime; 1805 else 1806 de->de_mtime = vap->va_mtime; 1807 } 1808 c = 1; 1809 } 1810 1811 if (c) { 1812 if (vp->v_type == VCHR) 1813 vfs_timestamp(&vp->v_rdev->si_ctime); 1814 else 1815 vfs_timestamp(&de->de_mtime); 1816 } 1817 1818 ret: 1819 sx_xunlock(&VFSTODEVFS(vp->v_mount)->dm_lock); 1820 return (error); 1821 } 1822 1823 #ifdef MAC 1824 static int 1825 devfs_setlabel(struct vop_setlabel_args *ap) 1826 { 1827 struct vnode *vp; 1828 struct devfs_dirent *de; 1829 1830 vp = ap->a_vp; 1831 de = vp->v_data; 1832 1833 mac_vnode_relabel(ap->a_cred, vp, ap->a_label); 1834 mac_devfs_update(vp->v_mount, de, vp); 1835 1836 return (0); 1837 } 1838 #endif 1839 1840 static int 1841 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) 1842 { 1843 1844 return (vnops.fo_stat(fp, sb, cred, td)); 1845 } 1846 1847 static int 1848 devfs_symlink(struct vop_symlink_args *ap) 1849 { 1850 int i, error; 1851 struct devfs_dirent *dd; 1852 struct devfs_dirent *de, *de_covered, *de_dotdot; 1853 struct devfs_mount *dmp; 1854 1855 error = priv_check(curthread, PRIV_DEVFS_SYMLINK); 1856 if (error) 1857 return(error); 1858 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1859 if (devfs_populate_vp(ap->a_dvp) != 0) 1860 return (ENOENT); 1861 1862 dd = ap->a_dvp->v_data; 1863 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1864 de->de_flags = DE_USER; 1865 de->de_uid = 0; 1866 de->de_gid = 0; 1867 de->de_mode = 0755; 1868 de->de_inode = alloc_unr(devfs_inos); 1869 de->de_dir = dd; 1870 de->de_dirent->d_type = DT_LNK; 1871 i = strlen(ap->a_target) + 1; 1872 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1873 bcopy(ap->a_target, de->de_symlink, i); 1874 #ifdef MAC 1875 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1876 #endif 1877 de_covered = devfs_find(dd, de->de_dirent->d_name, 1878 de->de_dirent->d_namlen, 0); 1879 if (de_covered != NULL) { 1880 if ((de_covered->de_flags & DE_USER) != 0) { 1881 devfs_delete(dmp, de, DEVFS_DEL_NORECURSE); 1882 sx_xunlock(&dmp->dm_lock); 1883 return (EEXIST); 1884 } 1885 KASSERT((de_covered->de_flags & DE_COVERED) == 0, 1886 ("devfs_symlink: entry %p already covered", de_covered)); 1887 de_covered->de_flags |= DE_COVERED; 1888 } 1889 1890 de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */ 1891 de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */ 1892 TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list); 1893 devfs_dir_ref_de(dmp, dd); 1894 devfs_rules_apply(dmp, de); 1895 1896 return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp)); 1897 } 1898 1899 static int 1900 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) 1901 { 1902 1903 return (vnops.fo_truncate(fp, length, cred, td)); 1904 } 1905 1906 static int 1907 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, 1908 int flags, struct thread *td) 1909 { 1910 struct cdev *dev; 1911 int error, ioflag, ref; 1912 ssize_t resid; 1913 struct cdevsw *dsw; 1914 struct file *fpop; 1915 1916 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1917 return (EINVAL); 1918 fpop = td->td_fpop; 1919 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1920 if (error != 0) { 1921 error = vnops.fo_write(fp, uio, cred, flags, td); 1922 return (error); 1923 } 1924 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1925 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1926 if (ioflag & O_DIRECT) 1927 ioflag |= IO_DIRECT; 1928 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1929 1930 resid = uio->uio_resid; 1931 1932 error = dsw->d_write(dev, uio, ioflag); 1933 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1934 devfs_timestamp(&dev->si_ctime); 1935 dev->si_mtime = dev->si_ctime; 1936 } 1937 td->td_fpop = fpop; 1938 dev_relthread(dev, ref); 1939 1940 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_W); 1941 return (error); 1942 } 1943 1944 static int 1945 devfs_mmap_f(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size, 1946 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff, 1947 struct thread *td) 1948 { 1949 struct cdev *dev; 1950 struct cdevsw *dsw; 1951 struct mount *mp; 1952 struct vnode *vp; 1953 struct file *fpop; 1954 vm_object_t object; 1955 vm_prot_t maxprot; 1956 int error, ref; 1957 1958 vp = fp->f_vnode; 1959 1960 /* 1961 * Ensure that file and memory protections are 1962 * compatible. 1963 */ 1964 mp = vp->v_mount; 1965 if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0) { 1966 maxprot = VM_PROT_NONE; 1967 if ((prot & VM_PROT_EXECUTE) != 0) 1968 return (EACCES); 1969 } else 1970 maxprot = VM_PROT_EXECUTE; 1971 if ((fp->f_flag & FREAD) != 0) 1972 maxprot |= VM_PROT_READ; 1973 else if ((prot & VM_PROT_READ) != 0) 1974 return (EACCES); 1975 1976 /* 1977 * If we are sharing potential changes via MAP_SHARED and we 1978 * are trying to get write permission although we opened it 1979 * without asking for it, bail out. 1980 * 1981 * Note that most character devices always share mappings. 1982 * The one exception is that D_MMAP_ANON devices 1983 * (i.e. /dev/zero) permit private writable mappings. 1984 * 1985 * Rely on vm_mmap_cdev() to fail invalid MAP_PRIVATE requests 1986 * as well as updating maxprot to permit writing for 1987 * D_MMAP_ANON devices rather than doing that here. 1988 */ 1989 if ((flags & MAP_SHARED) != 0) { 1990 if ((fp->f_flag & FWRITE) != 0) 1991 maxprot |= VM_PROT_WRITE; 1992 else if ((prot & VM_PROT_WRITE) != 0) 1993 return (EACCES); 1994 } 1995 maxprot &= cap_maxprot; 1996 1997 fpop = td->td_fpop; 1998 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1999 if (error != 0) 2000 return (error); 2001 2002 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, dev, dsw, &foff, 2003 &object); 2004 td->td_fpop = fpop; 2005 dev_relthread(dev, ref); 2006 if (error != 0) 2007 return (error); 2008 2009 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object, 2010 foff, FALSE, td); 2011 if (error != 0) 2012 vm_object_deallocate(object); 2013 return (error); 2014 } 2015 2016 dev_t 2017 dev2udev(struct cdev *x) 2018 { 2019 if (x == NULL) 2020 return (NODEV); 2021 return (cdev2priv(x)->cdp_inode); 2022 } 2023 2024 static struct fileops devfs_ops_f = { 2025 .fo_read = devfs_read_f, 2026 .fo_write = devfs_write_f, 2027 .fo_truncate = devfs_truncate_f, 2028 .fo_ioctl = devfs_ioctl_f, 2029 .fo_poll = devfs_poll_f, 2030 .fo_kqfilter = devfs_kqfilter_f, 2031 .fo_stat = devfs_stat_f, 2032 .fo_close = devfs_close_f, 2033 .fo_chmod = vn_chmod, 2034 .fo_chown = vn_chown, 2035 .fo_sendfile = vn_sendfile, 2036 .fo_seek = vn_seek, 2037 .fo_fill_kinfo = vn_fill_kinfo, 2038 .fo_mmap = devfs_mmap_f, 2039 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 2040 }; 2041 2042 /* Vops for non-CHR vnodes in /dev. */ 2043 static struct vop_vector devfs_vnodeops = { 2044 .vop_default = &default_vnodeops, 2045 2046 .vop_access = devfs_access, 2047 .vop_getattr = devfs_getattr, 2048 .vop_ioctl = devfs_rioctl, 2049 .vop_lookup = devfs_lookup, 2050 .vop_mknod = devfs_mknod, 2051 .vop_pathconf = devfs_pathconf, 2052 .vop_read = devfs_rread, 2053 .vop_readdir = devfs_readdir, 2054 .vop_readlink = devfs_readlink, 2055 .vop_reclaim = devfs_reclaim, 2056 .vop_remove = devfs_remove, 2057 .vop_revoke = devfs_revoke, 2058 .vop_setattr = devfs_setattr, 2059 #ifdef MAC 2060 .vop_setlabel = devfs_setlabel, 2061 #endif 2062 .vop_symlink = devfs_symlink, 2063 .vop_vptocnp = devfs_vptocnp, 2064 .vop_lock1 = vop_lock, 2065 .vop_unlock = vop_unlock, 2066 .vop_islocked = vop_islocked, 2067 }; 2068 VFS_VOP_VECTOR_REGISTER(devfs_vnodeops); 2069 2070 /* Vops for VCHR vnodes in /dev. */ 2071 static struct vop_vector devfs_specops = { 2072 .vop_default = &default_vnodeops, 2073 2074 .vop_access = devfs_access, 2075 .vop_bmap = VOP_PANIC, 2076 .vop_close = devfs_close, 2077 .vop_create = VOP_PANIC, 2078 .vop_fsync = vop_stdfsync, 2079 .vop_getattr = devfs_getattr, 2080 .vop_ioctl = devfs_ioctl, 2081 .vop_link = VOP_PANIC, 2082 .vop_mkdir = VOP_PANIC, 2083 .vop_mknod = VOP_PANIC, 2084 .vop_open = devfs_open, 2085 .vop_pathconf = devfs_pathconf, 2086 .vop_poll = dead_poll, 2087 .vop_print = devfs_print, 2088 .vop_read = dead_read, 2089 .vop_readdir = VOP_PANIC, 2090 .vop_readlink = VOP_PANIC, 2091 .vop_reallocblks = VOP_PANIC, 2092 .vop_reclaim = devfs_reclaim_vchr, 2093 .vop_remove = devfs_remove, 2094 .vop_rename = VOP_PANIC, 2095 .vop_revoke = devfs_revoke, 2096 .vop_rmdir = VOP_PANIC, 2097 .vop_setattr = devfs_setattr, 2098 #ifdef MAC 2099 .vop_setlabel = devfs_setlabel, 2100 #endif 2101 .vop_strategy = VOP_PANIC, 2102 .vop_symlink = VOP_PANIC, 2103 .vop_vptocnp = devfs_vptocnp, 2104 .vop_write = dead_write, 2105 .vop_lock1 = vop_lock, 2106 .vop_unlock = vop_unlock, 2107 .vop_islocked = vop_islocked, 2108 }; 2109 VFS_VOP_VECTOR_REGISTER(devfs_specops); 2110 2111 /* 2112 * Our calling convention to the device drivers used to be that we passed 2113 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 2114 * flags instead since that's what open(), close() and ioctl() takes and 2115 * we don't really want vnode.h in device drivers. 2116 * We solved the source compatibility by redefining some vnode flags to 2117 * be the same as the fcntl ones and by sending down the bitwise OR of 2118 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 2119 * pulls the rug out under this. 2120 */ 2121 CTASSERT(O_NONBLOCK == IO_NDELAY); 2122 CTASSERT(O_FSYNC == IO_SYNC); 2123