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, struct devfs_dirent *de) 512 { 513 514 mtx_lock(&devfs_de_interlock); 515 vp->v_data = NULL; 516 de->de_vnode = NULL; 517 mtx_unlock(&devfs_de_interlock); 518 vgone(vp); 519 vput(vp); 520 } 521 522 /* 523 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops 524 * it on return. 525 */ 526 int 527 devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode, 528 struct vnode **vpp) 529 { 530 int error; 531 struct vnode *vp; 532 struct cdev *dev; 533 struct devfs_mount *dmp; 534 struct cdevsw *dsw; 535 enum vgetstate vs; 536 537 dmp = VFSTODEVFS(mp); 538 if (de->de_flags & DE_DOOMED) { 539 sx_xunlock(&dmp->dm_lock); 540 return (ENOENT); 541 } 542 loop: 543 DEVFS_DE_HOLD(de); 544 DEVFS_DMP_HOLD(dmp); 545 mtx_lock(&devfs_de_interlock); 546 vp = de->de_vnode; 547 if (vp != NULL) { 548 vs = vget_prep(vp); 549 mtx_unlock(&devfs_de_interlock); 550 sx_xunlock(&dmp->dm_lock); 551 vget_finish(vp, lockmode | LK_RETRY, vs); 552 sx_xlock(&dmp->dm_lock); 553 if (devfs_allocv_drop_refs(0, dmp, de)) { 554 vput(vp); 555 return (ENOENT); 556 } 557 else if (VN_IS_DOOMED(vp)) { 558 mtx_lock(&devfs_de_interlock); 559 if (de->de_vnode == vp) { 560 de->de_vnode = NULL; 561 vp->v_data = NULL; 562 } 563 mtx_unlock(&devfs_de_interlock); 564 vput(vp); 565 goto loop; 566 } 567 sx_xunlock(&dmp->dm_lock); 568 *vpp = vp; 569 return (0); 570 } 571 mtx_unlock(&devfs_de_interlock); 572 if (de->de_dirent->d_type == DT_CHR) { 573 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { 574 devfs_allocv_drop_refs(1, dmp, de); 575 return (ENOENT); 576 } 577 dev = &de->de_cdp->cdp_c; 578 } else { 579 dev = NULL; 580 } 581 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 582 if (error != 0) { 583 devfs_allocv_drop_refs(1, dmp, de); 584 printf("devfs_allocv: failed to allocate new vnode\n"); 585 return (error); 586 } 587 588 if (de->de_dirent->d_type == DT_CHR) { 589 vp->v_type = VCHR; 590 VI_LOCK(vp); 591 dev_lock(); 592 dev_refl(dev); 593 /* XXX: v_rdev should be protect by vnode lock */ 594 vp->v_rdev = dev; 595 VNPASS(vp->v_usecount == 1, vp); 596 /* Special casing of ttys for deadfs. Probably redundant. */ 597 dsw = dev->si_devsw; 598 if (dsw != NULL && (dsw->d_flags & D_TTY) != 0) 599 vp->v_vflag |= VV_ISTTY; 600 dev_unlock(); 601 VI_UNLOCK(vp); 602 if ((dev->si_flags & SI_ETERNAL) != 0) 603 vp->v_vflag |= VV_ETERNALDEV; 604 vp->v_op = &devfs_specops; 605 } else if (de->de_dirent->d_type == DT_DIR) { 606 vp->v_type = VDIR; 607 } else if (de->de_dirent->d_type == DT_LNK) { 608 vp->v_type = VLNK; 609 } else { 610 vp->v_type = VBAD; 611 } 612 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS); 613 VN_LOCK_ASHARE(vp); 614 mtx_lock(&devfs_de_interlock); 615 vp->v_data = de; 616 de->de_vnode = vp; 617 mtx_unlock(&devfs_de_interlock); 618 error = insmntque1(vp, mp, NULL, NULL); 619 if (error != 0) { 620 devfs_insmntque_dtr(vp, de); 621 (void) devfs_allocv_drop_refs(1, dmp, de); 622 return (error); 623 } 624 if (devfs_allocv_drop_refs(0, dmp, de)) { 625 vput(vp); 626 return (ENOENT); 627 } 628 #ifdef MAC 629 mac_devfs_vnode_associate(mp, de, vp); 630 #endif 631 sx_xunlock(&dmp->dm_lock); 632 *vpp = vp; 633 return (0); 634 } 635 636 static int 637 devfs_access(struct vop_access_args *ap) 638 { 639 struct vnode *vp = ap->a_vp; 640 struct devfs_dirent *de; 641 struct proc *p; 642 int error; 643 644 de = vp->v_data; 645 if (vp->v_type == VDIR) 646 de = de->de_dir; 647 648 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 649 ap->a_accmode, ap->a_cred); 650 if (error == 0) 651 return (0); 652 if (error != EACCES) 653 return (error); 654 p = ap->a_td->td_proc; 655 /* We do, however, allow access to the controlling terminal */ 656 PROC_LOCK(p); 657 if (!(p->p_flag & P_CONTROLT)) { 658 PROC_UNLOCK(p); 659 return (error); 660 } 661 if (p->p_session->s_ttydp == de->de_cdp) 662 error = 0; 663 PROC_UNLOCK(p); 664 return (error); 665 } 666 667 _Static_assert(((FMASK | FCNTLFLAGS) & (FLASTCLOSE | FREVOKE)) == 0, 668 "devfs-only flag reuse failed"); 669 670 static int 671 devfs_close(struct vop_close_args *ap) 672 { 673 struct vnode *vp = ap->a_vp, *oldvp; 674 struct thread *td = ap->a_td; 675 struct proc *p; 676 struct cdev *dev = vp->v_rdev; 677 struct cdevsw *dsw; 678 struct devfs_dirent *de = vp->v_data; 679 int dflags, error, ref, vp_locked; 680 681 /* 682 * XXX: Don't call d_close() if we were called because of 683 * XXX: insmntque() failure. 684 */ 685 if (vp->v_data == NULL) 686 return (0); 687 688 /* 689 * Hack: a tty device that is a controlling terminal 690 * has a reference from the session structure. 691 * We cannot easily tell that a character device is 692 * a controlling terminal, unless it is the closing 693 * process' controlling terminal. In that case, 694 * if the reference count is 2 (this last descriptor 695 * plus the session), release the reference from the session. 696 */ 697 if (de->de_usecount == 2 && td != NULL) { 698 p = td->td_proc; 699 PROC_LOCK(p); 700 if (vp == p->p_session->s_ttyvp) { 701 PROC_UNLOCK(p); 702 oldvp = NULL; 703 sx_xlock(&proctree_lock); 704 if (vp == p->p_session->s_ttyvp) { 705 SESS_LOCK(p->p_session); 706 mtx_lock(&devfs_de_interlock); 707 VI_LOCK(vp); 708 if (devfs_usecountl(vp) == 2 && !VN_IS_DOOMED(vp)) { 709 p->p_session->s_ttyvp = NULL; 710 p->p_session->s_ttydp = NULL; 711 oldvp = vp; 712 } 713 VI_UNLOCK(vp); 714 mtx_unlock(&devfs_de_interlock); 715 SESS_UNLOCK(p->p_session); 716 } 717 sx_xunlock(&proctree_lock); 718 if (oldvp != NULL) 719 devfs_ctty_unref(oldvp); 720 } else 721 PROC_UNLOCK(p); 722 } 723 /* 724 * We do not want to really close the device if it 725 * is still in use unless we are trying to close it 726 * forcibly. Since every use (buffer, vnode, swap, cmap) 727 * holds a reference to the vnode, and because we mark 728 * any other vnodes that alias this device, when the 729 * sum of the reference counts on all the aliased 730 * vnodes descends to one, we are on last close. 731 */ 732 dsw = dev_refthread(dev, &ref); 733 if (dsw == NULL) 734 return (ENXIO); 735 dflags = 0; 736 mtx_lock(&devfs_de_interlock); 737 VI_LOCK(vp); 738 if (devfs_usecountl(vp) == 1) 739 dflags |= FLASTCLOSE; 740 devfs_usecount_subl(vp); 741 mtx_unlock(&devfs_de_interlock); 742 if (VN_IS_DOOMED(vp)) { 743 /* Forced close. */ 744 dflags |= FREVOKE | FNONBLOCK; 745 } else if (dsw->d_flags & D_TRACKCLOSE) { 746 /* Keep device updated on status. */ 747 } else if ((dflags & FLASTCLOSE) == 0) { 748 VI_UNLOCK(vp); 749 dev_relthread(dev, ref); 750 return (0); 751 } 752 vholdnz(vp); 753 VI_UNLOCK(vp); 754 vp_locked = VOP_ISLOCKED(vp); 755 VOP_UNLOCK(vp); 756 KASSERT(dev->si_refcount > 0, 757 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 758 error = dsw->d_close(dev, ap->a_fflag | dflags, S_IFCHR, td); 759 dev_relthread(dev, ref); 760 vn_lock(vp, vp_locked | LK_RETRY); 761 vdrop(vp); 762 return (error); 763 } 764 765 static int 766 devfs_close_f(struct file *fp, struct thread *td) 767 { 768 int error; 769 struct file *fpop; 770 771 /* 772 * NB: td may be NULL if this descriptor is closed due to 773 * garbage collection from a closed UNIX domain socket. 774 */ 775 fpop = curthread->td_fpop; 776 curthread->td_fpop = fp; 777 error = vnops.fo_close(fp, td); 778 curthread->td_fpop = fpop; 779 780 /* 781 * The f_cdevpriv cannot be assigned non-NULL value while we 782 * are destroying the file. 783 */ 784 if (fp->f_cdevpriv != NULL) 785 devfs_fpdrop(fp); 786 return (error); 787 } 788 789 static int 790 devfs_getattr(struct vop_getattr_args *ap) 791 { 792 struct vnode *vp = ap->a_vp; 793 struct vattr *vap = ap->a_vap; 794 struct devfs_dirent *de; 795 struct devfs_mount *dmp; 796 struct cdev *dev; 797 struct timeval boottime; 798 int error; 799 800 error = devfs_populate_vp(vp); 801 if (error != 0) 802 return (error); 803 804 dmp = VFSTODEVFS(vp->v_mount); 805 sx_xunlock(&dmp->dm_lock); 806 807 de = vp->v_data; 808 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 809 if (vp->v_type == VDIR) { 810 de = de->de_dir; 811 KASSERT(de != NULL, 812 ("Null dir dirent in devfs_getattr vp=%p", vp)); 813 } 814 vap->va_uid = de->de_uid; 815 vap->va_gid = de->de_gid; 816 vap->va_mode = de->de_mode; 817 if (vp->v_type == VLNK) 818 vap->va_size = strlen(de->de_symlink); 819 else if (vp->v_type == VDIR) 820 vap->va_size = vap->va_bytes = DEV_BSIZE; 821 else 822 vap->va_size = 0; 823 if (vp->v_type != VDIR) 824 vap->va_bytes = 0; 825 vap->va_blocksize = DEV_BSIZE; 826 vap->va_type = vp->v_type; 827 828 getboottime(&boottime); 829 #define fix(aa) \ 830 do { \ 831 if ((aa).tv_sec <= 3600) { \ 832 (aa).tv_sec = boottime.tv_sec; \ 833 (aa).tv_nsec = boottime.tv_usec * 1000; \ 834 } \ 835 } while (0) 836 837 if (vp->v_type != VCHR) { 838 fix(de->de_atime); 839 vap->va_atime = de->de_atime; 840 fix(de->de_mtime); 841 vap->va_mtime = de->de_mtime; 842 fix(de->de_ctime); 843 vap->va_ctime = de->de_ctime; 844 } else { 845 dev = vp->v_rdev; 846 fix(dev->si_atime); 847 vap->va_atime = dev->si_atime; 848 fix(dev->si_mtime); 849 vap->va_mtime = dev->si_mtime; 850 fix(dev->si_ctime); 851 vap->va_ctime = dev->si_ctime; 852 853 vap->va_rdev = cdev2priv(dev)->cdp_inode; 854 } 855 vap->va_gen = 0; 856 vap->va_flags = 0; 857 vap->va_filerev = 0; 858 vap->va_nlink = de->de_links; 859 vap->va_fileid = de->de_inode; 860 861 return (error); 862 } 863 864 /* ARGSUSED */ 865 static int 866 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 867 { 868 struct file *fpop; 869 int error; 870 871 fpop = td->td_fpop; 872 td->td_fpop = fp; 873 error = vnops.fo_ioctl(fp, com, data, cred, td); 874 td->td_fpop = fpop; 875 return (error); 876 } 877 878 void * 879 fiodgname_buf_get_ptr(void *fgnp, u_long com) 880 { 881 union { 882 struct fiodgname_arg fgn; 883 #ifdef COMPAT_FREEBSD32 884 struct fiodgname_arg32 fgn32; 885 #endif 886 } *fgnup; 887 888 fgnup = fgnp; 889 switch (com) { 890 case FIODGNAME: 891 return (fgnup->fgn.buf); 892 #ifdef COMPAT_FREEBSD32 893 case FIODGNAME_32: 894 return ((void *)(uintptr_t)fgnup->fgn32.buf); 895 #endif 896 default: 897 panic("Unhandled ioctl command %ld", com); 898 } 899 } 900 901 static int 902 devfs_ioctl(struct vop_ioctl_args *ap) 903 { 904 struct fiodgname_arg *fgn; 905 struct vnode *vpold, *vp; 906 struct cdevsw *dsw; 907 struct thread *td; 908 struct session *sess; 909 struct cdev *dev; 910 int error, ref, i; 911 const char *p; 912 u_long com; 913 914 vp = ap->a_vp; 915 com = ap->a_command; 916 td = ap->a_td; 917 918 dsw = devvn_refthread(vp, &dev, &ref); 919 if (dsw == NULL) 920 return (ENXIO); 921 KASSERT(dev->si_refcount > 0, 922 ("devfs: un-referenced struct cdev *(%s)", devtoname(dev))); 923 924 switch (com) { 925 case FIODTYPE: 926 *(int *)ap->a_data = dsw->d_flags & D_TYPEMASK; 927 error = 0; 928 break; 929 case FIODGNAME: 930 #ifdef COMPAT_FREEBSD32 931 case FIODGNAME_32: 932 #endif 933 fgn = ap->a_data; 934 p = devtoname(dev); 935 i = strlen(p) + 1; 936 if (i > fgn->len) 937 error = EINVAL; 938 else 939 error = copyout(p, fiodgname_buf_get_ptr(fgn, com), i); 940 break; 941 default: 942 error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td); 943 } 944 945 dev_relthread(dev, ref); 946 if (error == ENOIOCTL) 947 error = ENOTTY; 948 949 if (error == 0 && com == TIOCSCTTY) { 950 /* 951 * Do nothing if reassigning same control tty, or if the 952 * control tty has already disappeared. If it disappeared, 953 * it's because we were racing with TIOCNOTTY. TIOCNOTTY 954 * already took care of releasing the old vnode and we have 955 * nothing left to do. 956 */ 957 sx_slock(&proctree_lock); 958 sess = td->td_proc->p_session; 959 if (sess->s_ttyvp == vp || sess->s_ttyp == NULL) { 960 sx_sunlock(&proctree_lock); 961 return (0); 962 } 963 964 devfs_ctty_ref(vp); 965 SESS_LOCK(sess); 966 vpold = sess->s_ttyvp; 967 sess->s_ttyvp = vp; 968 sess->s_ttydp = cdev2priv(dev); 969 SESS_UNLOCK(sess); 970 971 sx_sunlock(&proctree_lock); 972 973 /* Get rid of reference to old control tty */ 974 if (vpold) 975 devfs_ctty_unref(vpold); 976 } 977 return (error); 978 } 979 980 /* ARGSUSED */ 981 static int 982 devfs_kqfilter_f(struct file *fp, struct knote *kn) 983 { 984 struct cdev *dev; 985 struct cdevsw *dsw; 986 int error, ref; 987 struct file *fpop; 988 struct thread *td; 989 990 td = curthread; 991 fpop = td->td_fpop; 992 error = devfs_fp_check(fp, &dev, &dsw, &ref); 993 if (error) 994 return (error); 995 error = dsw->d_kqfilter(dev, kn); 996 td->td_fpop = fpop; 997 dev_relthread(dev, ref); 998 return (error); 999 } 1000 1001 static inline int 1002 devfs_prison_check(struct devfs_dirent *de, struct thread *td) 1003 { 1004 struct cdev_priv *cdp; 1005 struct ucred *dcr; 1006 struct proc *p; 1007 int error; 1008 1009 cdp = de->de_cdp; 1010 if (cdp == NULL) 1011 return (0); 1012 dcr = cdp->cdp_c.si_cred; 1013 if (dcr == NULL) 1014 return (0); 1015 1016 error = prison_check(td->td_ucred, dcr); 1017 if (error == 0) 1018 return (0); 1019 /* We do, however, allow access to the controlling terminal */ 1020 p = td->td_proc; 1021 PROC_LOCK(p); 1022 if (!(p->p_flag & P_CONTROLT)) { 1023 PROC_UNLOCK(p); 1024 return (error); 1025 } 1026 if (p->p_session->s_ttydp == cdp) 1027 error = 0; 1028 PROC_UNLOCK(p); 1029 return (error); 1030 } 1031 1032 static int 1033 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 1034 { 1035 struct componentname *cnp; 1036 struct vnode *dvp, **vpp; 1037 struct thread *td; 1038 struct devfs_dirent *de, *dd; 1039 struct devfs_dirent **dde; 1040 struct devfs_mount *dmp; 1041 struct mount *mp; 1042 struct cdev *cdev; 1043 int error, flags, nameiop, dvplocked; 1044 char specname[SPECNAMELEN + 1], *pname; 1045 1046 td = curthread; 1047 cnp = ap->a_cnp; 1048 vpp = ap->a_vpp; 1049 dvp = ap->a_dvp; 1050 pname = cnp->cn_nameptr; 1051 flags = cnp->cn_flags; 1052 nameiop = cnp->cn_nameiop; 1053 mp = dvp->v_mount; 1054 dmp = VFSTODEVFS(mp); 1055 dd = dvp->v_data; 1056 *vpp = NULLVP; 1057 1058 if ((flags & ISLASTCN) && nameiop == RENAME) 1059 return (EOPNOTSUPP); 1060 1061 if (dvp->v_type != VDIR) 1062 return (ENOTDIR); 1063 1064 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 1065 return (EIO); 1066 1067 error = vn_dir_check_exec(dvp, cnp); 1068 if (error != 0) 1069 return (error); 1070 1071 if (cnp->cn_namelen == 1 && *pname == '.') { 1072 if ((flags & ISLASTCN) && nameiop != LOOKUP) 1073 return (EINVAL); 1074 *vpp = dvp; 1075 VREF(dvp); 1076 return (0); 1077 } 1078 1079 if (flags & ISDOTDOT) { 1080 if ((flags & ISLASTCN) && nameiop != LOOKUP) 1081 return (EINVAL); 1082 de = devfs_parent_dirent(dd); 1083 if (de == NULL) 1084 return (ENOENT); 1085 dvplocked = VOP_ISLOCKED(dvp); 1086 VOP_UNLOCK(dvp); 1087 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, 1088 vpp); 1089 *dm_unlock = 0; 1090 vn_lock(dvp, dvplocked | LK_RETRY); 1091 return (error); 1092 } 1093 1094 dd = dvp->v_data; 1095 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0); 1096 while (de == NULL) { /* While(...) so we can use break */ 1097 1098 if (nameiop == DELETE) 1099 return (ENOENT); 1100 1101 /* 1102 * OK, we didn't have an entry for the name we were asked for 1103 * so we try to see if anybody can create it on demand. 1104 */ 1105 pname = devfs_fqpn(specname, dmp, dd, cnp); 1106 if (pname == NULL) 1107 break; 1108 1109 cdev = NULL; 1110 DEVFS_DMP_HOLD(dmp); 1111 sx_xunlock(&dmp->dm_lock); 1112 sx_slock(&clone_drain_lock); 1113 EVENTHANDLER_INVOKE(dev_clone, 1114 td->td_ucred, pname, strlen(pname), &cdev); 1115 sx_sunlock(&clone_drain_lock); 1116 1117 if (cdev == NULL) 1118 sx_xlock(&dmp->dm_lock); 1119 else if (devfs_populate_vp(dvp) != 0) { 1120 *dm_unlock = 0; 1121 sx_xlock(&dmp->dm_lock); 1122 if (DEVFS_DMP_DROP(dmp)) { 1123 sx_xunlock(&dmp->dm_lock); 1124 devfs_unmount_final(dmp); 1125 } else 1126 sx_xunlock(&dmp->dm_lock); 1127 dev_rel(cdev); 1128 return (ENOENT); 1129 } 1130 if (DEVFS_DMP_DROP(dmp)) { 1131 *dm_unlock = 0; 1132 sx_xunlock(&dmp->dm_lock); 1133 devfs_unmount_final(dmp); 1134 if (cdev != NULL) 1135 dev_rel(cdev); 1136 return (ENOENT); 1137 } 1138 1139 if (cdev == NULL) 1140 break; 1141 1142 dev_lock(); 1143 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx]; 1144 if (dde != NULL && *dde != NULL) 1145 de = *dde; 1146 dev_unlock(); 1147 dev_rel(cdev); 1148 break; 1149 } 1150 1151 if (de == NULL || de->de_flags & DE_WHITEOUT) { 1152 if ((nameiop == CREATE || nameiop == RENAME) && 1153 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 1154 cnp->cn_flags |= SAVENAME; 1155 return (EJUSTRETURN); 1156 } 1157 return (ENOENT); 1158 } 1159 1160 if (devfs_prison_check(de, td)) 1161 return (ENOENT); 1162 1163 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 1164 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 1165 if (error) 1166 return (error); 1167 if (*vpp == dvp) { 1168 VREF(dvp); 1169 *vpp = dvp; 1170 return (0); 1171 } 1172 } 1173 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, vpp); 1174 *dm_unlock = 0; 1175 return (error); 1176 } 1177 1178 static int 1179 devfs_lookup(struct vop_lookup_args *ap) 1180 { 1181 int j; 1182 struct devfs_mount *dmp; 1183 int dm_unlock; 1184 1185 if (devfs_populate_vp(ap->a_dvp) != 0) 1186 return (ENOTDIR); 1187 1188 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1189 dm_unlock = 1; 1190 j = devfs_lookupx(ap, &dm_unlock); 1191 if (dm_unlock == 1) 1192 sx_xunlock(&dmp->dm_lock); 1193 return (j); 1194 } 1195 1196 static int 1197 devfs_mknod(struct vop_mknod_args *ap) 1198 { 1199 struct componentname *cnp; 1200 struct vnode *dvp, **vpp; 1201 struct devfs_dirent *dd, *de; 1202 struct devfs_mount *dmp; 1203 int error; 1204 1205 /* 1206 * The only type of node we should be creating here is a 1207 * character device, for anything else return EOPNOTSUPP. 1208 */ 1209 if (ap->a_vap->va_type != VCHR) 1210 return (EOPNOTSUPP); 1211 dvp = ap->a_dvp; 1212 dmp = VFSTODEVFS(dvp->v_mount); 1213 1214 cnp = ap->a_cnp; 1215 vpp = ap->a_vpp; 1216 dd = dvp->v_data; 1217 1218 error = ENOENT; 1219 sx_xlock(&dmp->dm_lock); 1220 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 1221 if (cnp->cn_namelen != de->de_dirent->d_namlen) 1222 continue; 1223 if (de->de_dirent->d_type == DT_CHR && 1224 (de->de_cdp->cdp_flags & CDP_ACTIVE) == 0) 1225 continue; 1226 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 1227 de->de_dirent->d_namlen) != 0) 1228 continue; 1229 if (de->de_flags & DE_WHITEOUT) 1230 break; 1231 goto notfound; 1232 } 1233 if (de == NULL) 1234 goto notfound; 1235 de->de_flags &= ~DE_WHITEOUT; 1236 error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp); 1237 return (error); 1238 notfound: 1239 sx_xunlock(&dmp->dm_lock); 1240 return (error); 1241 } 1242 1243 /* ARGSUSED */ 1244 static int 1245 devfs_open(struct vop_open_args *ap) 1246 { 1247 struct thread *td = ap->a_td; 1248 struct vnode *vp = ap->a_vp; 1249 struct cdev *dev = vp->v_rdev; 1250 struct file *fp = ap->a_fp; 1251 int error, ref, vlocked; 1252 struct cdevsw *dsw; 1253 struct file *fpop; 1254 1255 if (vp->v_type == VBLK) 1256 return (ENXIO); 1257 1258 if (dev == NULL) 1259 return (ENXIO); 1260 1261 /* Make this field valid before any I/O in d_open. */ 1262 if (dev->si_iosize_max == 0) 1263 dev->si_iosize_max = DFLTPHYS; 1264 1265 dsw = dev_refthread(dev, &ref); 1266 if (dsw == NULL) 1267 return (ENXIO); 1268 if (fp == NULL && dsw->d_fdopen != NULL) { 1269 dev_relthread(dev, ref); 1270 return (ENXIO); 1271 } 1272 1273 if (vp->v_type == VCHR) 1274 devfs_usecount_add(vp); 1275 1276 vlocked = VOP_ISLOCKED(vp); 1277 VOP_UNLOCK(vp); 1278 1279 fpop = td->td_fpop; 1280 td->td_fpop = fp; 1281 if (fp != NULL) { 1282 fp->f_data = dev; 1283 fp->f_vnode = vp; 1284 } 1285 if (dsw->d_fdopen != NULL) 1286 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 1287 else 1288 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 1289 /* Clean up any cdevpriv upon error. */ 1290 if (error != 0) 1291 devfs_clear_cdevpriv(); 1292 td->td_fpop = fpop; 1293 1294 vn_lock(vp, vlocked | LK_RETRY); 1295 if (error != 0 && vp->v_type == VCHR) 1296 devfs_usecount_sub(vp); 1297 1298 dev_relthread(dev, ref); 1299 if (error != 0) { 1300 if (error == ERESTART) 1301 error = EINTR; 1302 return (error); 1303 } 1304 1305 #if 0 /* /dev/console */ 1306 KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp")); 1307 #else 1308 if (fp == NULL) 1309 return (error); 1310 #endif 1311 if (fp->f_ops == &badfileops) 1312 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f); 1313 return (error); 1314 } 1315 1316 static int 1317 devfs_pathconf(struct vop_pathconf_args *ap) 1318 { 1319 1320 switch (ap->a_name) { 1321 case _PC_FILESIZEBITS: 1322 *ap->a_retval = 64; 1323 return (0); 1324 case _PC_NAME_MAX: 1325 *ap->a_retval = NAME_MAX; 1326 return (0); 1327 case _PC_LINK_MAX: 1328 *ap->a_retval = INT_MAX; 1329 return (0); 1330 case _PC_SYMLINK_MAX: 1331 *ap->a_retval = MAXPATHLEN; 1332 return (0); 1333 case _PC_MAX_CANON: 1334 if (ap->a_vp->v_vflag & VV_ISTTY) { 1335 *ap->a_retval = MAX_CANON; 1336 return (0); 1337 } 1338 return (EINVAL); 1339 case _PC_MAX_INPUT: 1340 if (ap->a_vp->v_vflag & VV_ISTTY) { 1341 *ap->a_retval = MAX_INPUT; 1342 return (0); 1343 } 1344 return (EINVAL); 1345 case _PC_VDISABLE: 1346 if (ap->a_vp->v_vflag & VV_ISTTY) { 1347 *ap->a_retval = _POSIX_VDISABLE; 1348 return (0); 1349 } 1350 return (EINVAL); 1351 case _PC_MAC_PRESENT: 1352 #ifdef MAC 1353 /* 1354 * If MAC is enabled, devfs automatically supports 1355 * trivial non-persistant label storage. 1356 */ 1357 *ap->a_retval = 1; 1358 #else 1359 *ap->a_retval = 0; 1360 #endif 1361 return (0); 1362 case _PC_CHOWN_RESTRICTED: 1363 *ap->a_retval = 1; 1364 return (0); 1365 default: 1366 return (vop_stdpathconf(ap)); 1367 } 1368 /* NOTREACHED */ 1369 } 1370 1371 /* ARGSUSED */ 1372 static int 1373 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 1374 { 1375 struct cdev *dev; 1376 struct cdevsw *dsw; 1377 int error, ref; 1378 struct file *fpop; 1379 1380 fpop = td->td_fpop; 1381 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1382 if (error != 0) { 1383 error = vnops.fo_poll(fp, events, cred, td); 1384 return (error); 1385 } 1386 error = dsw->d_poll(dev, events, td); 1387 td->td_fpop = fpop; 1388 dev_relthread(dev, ref); 1389 return(error); 1390 } 1391 1392 /* 1393 * Print out the contents of a special device vnode. 1394 */ 1395 static int 1396 devfs_print(struct vop_print_args *ap) 1397 { 1398 1399 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 1400 return (0); 1401 } 1402 1403 static int 1404 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, 1405 int flags, struct thread *td) 1406 { 1407 struct cdev *dev; 1408 int ioflag, error, ref; 1409 ssize_t resid; 1410 struct cdevsw *dsw; 1411 struct file *fpop; 1412 1413 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1414 return (EINVAL); 1415 fpop = td->td_fpop; 1416 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1417 if (error != 0) { 1418 error = vnops.fo_read(fp, uio, cred, flags, td); 1419 return (error); 1420 } 1421 resid = uio->uio_resid; 1422 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 1423 if (ioflag & O_DIRECT) 1424 ioflag |= IO_DIRECT; 1425 1426 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1427 error = dsw->d_read(dev, uio, ioflag); 1428 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 1429 devfs_timestamp(&dev->si_atime); 1430 td->td_fpop = fpop; 1431 dev_relthread(dev, ref); 1432 1433 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_R); 1434 return (error); 1435 } 1436 1437 static int 1438 devfs_readdir(struct vop_readdir_args *ap) 1439 { 1440 int error; 1441 struct uio *uio; 1442 struct dirent *dp; 1443 struct devfs_dirent *dd; 1444 struct devfs_dirent *de; 1445 struct devfs_mount *dmp; 1446 off_t off; 1447 int *tmp_ncookies = NULL; 1448 1449 if (ap->a_vp->v_type != VDIR) 1450 return (ENOTDIR); 1451 1452 uio = ap->a_uio; 1453 if (uio->uio_offset < 0) 1454 return (EINVAL); 1455 1456 /* 1457 * XXX: This is a temporary hack to get around this filesystem not 1458 * supporting cookies. We store the location of the ncookies pointer 1459 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 1460 * and set the number of cookies to 0. We then set the pointer to 1461 * NULL so that vfs_read_dirent doesn't try to call realloc() on 1462 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 1463 * pointer to its original location before returning to the caller. 1464 */ 1465 if (ap->a_ncookies != NULL) { 1466 tmp_ncookies = ap->a_ncookies; 1467 *ap->a_ncookies = 0; 1468 ap->a_ncookies = NULL; 1469 } 1470 1471 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1472 if (devfs_populate_vp(ap->a_vp) != 0) { 1473 if (tmp_ncookies != NULL) 1474 ap->a_ncookies = tmp_ncookies; 1475 return (EIO); 1476 } 1477 error = 0; 1478 de = ap->a_vp->v_data; 1479 off = 0; 1480 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 1481 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 1482 if (dd->de_flags & (DE_COVERED | DE_WHITEOUT)) 1483 continue; 1484 if (devfs_prison_check(dd, uio->uio_td)) 1485 continue; 1486 if (dd->de_dirent->d_type == DT_DIR) 1487 de = dd->de_dir; 1488 else 1489 de = dd; 1490 dp = dd->de_dirent; 1491 MPASS(dp->d_reclen == GENERIC_DIRSIZ(dp)); 1492 if (dp->d_reclen > uio->uio_resid) 1493 break; 1494 dp->d_fileno = de->de_inode; 1495 /* NOTE: d_off is the offset for the *next* entry. */ 1496 dp->d_off = off + dp->d_reclen; 1497 if (off >= uio->uio_offset) { 1498 error = vfs_read_dirent(ap, dp, off); 1499 if (error) 1500 break; 1501 } 1502 off += dp->d_reclen; 1503 } 1504 sx_xunlock(&dmp->dm_lock); 1505 uio->uio_offset = off; 1506 1507 /* 1508 * Restore ap->a_ncookies if it wasn't originally NULL in the first 1509 * place. 1510 */ 1511 if (tmp_ncookies != NULL) 1512 ap->a_ncookies = tmp_ncookies; 1513 1514 return (error); 1515 } 1516 1517 static int 1518 devfs_readlink(struct vop_readlink_args *ap) 1519 { 1520 struct devfs_dirent *de; 1521 1522 de = ap->a_vp->v_data; 1523 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 1524 } 1525 1526 static void 1527 devfs_reclaiml(struct vnode *vp) 1528 { 1529 struct devfs_dirent *de; 1530 1531 mtx_assert(&devfs_de_interlock, MA_OWNED); 1532 de = vp->v_data; 1533 if (de != NULL) { 1534 MPASS(de->de_usecount == 0); 1535 de->de_vnode = NULL; 1536 vp->v_data = NULL; 1537 } 1538 } 1539 1540 static int 1541 devfs_reclaim(struct vop_reclaim_args *ap) 1542 { 1543 struct vnode *vp; 1544 1545 vp = ap->a_vp; 1546 mtx_lock(&devfs_de_interlock); 1547 devfs_reclaiml(vp); 1548 mtx_unlock(&devfs_de_interlock); 1549 return (0); 1550 } 1551 1552 static int 1553 devfs_reclaim_vchr(struct vop_reclaim_args *ap) 1554 { 1555 struct vnode *vp; 1556 struct cdev *dev; 1557 1558 vp = ap->a_vp; 1559 MPASS(vp->v_type == VCHR); 1560 1561 mtx_lock(&devfs_de_interlock); 1562 VI_LOCK(vp); 1563 devfs_usecount_subl(vp); 1564 devfs_reclaiml(vp); 1565 mtx_unlock(&devfs_de_interlock); 1566 dev_lock(); 1567 dev = vp->v_rdev; 1568 vp->v_rdev = NULL; 1569 dev_unlock(); 1570 VI_UNLOCK(vp); 1571 if (dev != NULL) 1572 dev_rel(dev); 1573 return (0); 1574 } 1575 1576 static int 1577 devfs_remove(struct vop_remove_args *ap) 1578 { 1579 struct vnode *dvp = ap->a_dvp; 1580 struct vnode *vp = ap->a_vp; 1581 struct devfs_dirent *dd; 1582 struct devfs_dirent *de, *de_covered; 1583 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1584 1585 ASSERT_VOP_ELOCKED(dvp, "devfs_remove"); 1586 ASSERT_VOP_ELOCKED(vp, "devfs_remove"); 1587 1588 sx_xlock(&dmp->dm_lock); 1589 dd = ap->a_dvp->v_data; 1590 de = vp->v_data; 1591 if (de->de_cdp == NULL) { 1592 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1593 if (de->de_dirent->d_type == DT_LNK) { 1594 de_covered = devfs_find(dd, de->de_dirent->d_name, 1595 de->de_dirent->d_namlen, 0); 1596 if (de_covered != NULL) 1597 de_covered->de_flags &= ~DE_COVERED; 1598 } 1599 /* We need to unlock dvp because devfs_delete() may lock it. */ 1600 VOP_UNLOCK(vp); 1601 if (dvp != vp) 1602 VOP_UNLOCK(dvp); 1603 devfs_delete(dmp, de, 0); 1604 sx_xunlock(&dmp->dm_lock); 1605 if (dvp != vp) 1606 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1607 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1608 } else { 1609 de->de_flags |= DE_WHITEOUT; 1610 sx_xunlock(&dmp->dm_lock); 1611 } 1612 return (0); 1613 } 1614 1615 /* 1616 * Revoke is called on a tty when a terminal session ends. The vnode 1617 * is orphaned by setting v_op to deadfs so we need to let go of it 1618 * as well so that we create a new one next time around. 1619 * 1620 */ 1621 static int 1622 devfs_revoke(struct vop_revoke_args *ap) 1623 { 1624 struct vnode *vp = ap->a_vp, *vp2; 1625 struct cdev *dev; 1626 struct cdev_priv *cdp; 1627 struct devfs_dirent *de; 1628 enum vgetstate vs; 1629 u_int i; 1630 1631 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1632 1633 dev = vp->v_rdev; 1634 cdp = cdev2priv(dev); 1635 1636 dev_lock(); 1637 cdp->cdp_inuse++; 1638 dev_unlock(); 1639 1640 vhold(vp); 1641 vgone(vp); 1642 vdrop(vp); 1643 1644 VOP_UNLOCK(vp); 1645 loop: 1646 for (;;) { 1647 mtx_lock(&devfs_de_interlock); 1648 dev_lock(); 1649 vp2 = NULL; 1650 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1651 de = cdp->cdp_dirents[i]; 1652 if (de == NULL) 1653 continue; 1654 1655 vp2 = de->de_vnode; 1656 if (vp2 != NULL) { 1657 dev_unlock(); 1658 vs = vget_prep(vp2); 1659 mtx_unlock(&devfs_de_interlock); 1660 if (vget_finish(vp2, LK_EXCLUSIVE, vs) != 0) 1661 goto loop; 1662 vhold(vp2); 1663 vgone(vp2); 1664 vdrop(vp2); 1665 vput(vp2); 1666 break; 1667 } 1668 } 1669 if (vp2 != NULL) { 1670 continue; 1671 } 1672 dev_unlock(); 1673 mtx_unlock(&devfs_de_interlock); 1674 break; 1675 } 1676 dev_lock(); 1677 cdp->cdp_inuse--; 1678 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1679 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1680 dev_unlock(); 1681 dev_rel(&cdp->cdp_c); 1682 } else 1683 dev_unlock(); 1684 1685 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1686 return (0); 1687 } 1688 1689 static int 1690 devfs_rioctl(struct vop_ioctl_args *ap) 1691 { 1692 struct vnode *vp; 1693 struct devfs_mount *dmp; 1694 int error; 1695 1696 vp = ap->a_vp; 1697 vn_lock(vp, LK_SHARED | LK_RETRY); 1698 if (VN_IS_DOOMED(vp)) { 1699 VOP_UNLOCK(vp); 1700 return (EBADF); 1701 } 1702 dmp = VFSTODEVFS(vp->v_mount); 1703 sx_xlock(&dmp->dm_lock); 1704 VOP_UNLOCK(vp); 1705 DEVFS_DMP_HOLD(dmp); 1706 devfs_populate(dmp); 1707 if (DEVFS_DMP_DROP(dmp)) { 1708 sx_xunlock(&dmp->dm_lock); 1709 devfs_unmount_final(dmp); 1710 return (ENOENT); 1711 } 1712 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1713 sx_xunlock(&dmp->dm_lock); 1714 return (error); 1715 } 1716 1717 static int 1718 devfs_rread(struct vop_read_args *ap) 1719 { 1720 1721 if (ap->a_vp->v_type != VDIR) 1722 return (EINVAL); 1723 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1724 } 1725 1726 static int 1727 devfs_setattr(struct vop_setattr_args *ap) 1728 { 1729 struct devfs_dirent *de; 1730 struct vattr *vap; 1731 struct vnode *vp; 1732 struct thread *td; 1733 int c, error; 1734 uid_t uid; 1735 gid_t gid; 1736 1737 vap = ap->a_vap; 1738 vp = ap->a_vp; 1739 td = curthread; 1740 if ((vap->va_type != VNON) || 1741 (vap->va_nlink != VNOVAL) || 1742 (vap->va_fsid != VNOVAL) || 1743 (vap->va_fileid != VNOVAL) || 1744 (vap->va_blocksize != VNOVAL) || 1745 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1746 (vap->va_rdev != VNOVAL) || 1747 ((int)vap->va_bytes != VNOVAL) || 1748 (vap->va_gen != VNOVAL)) { 1749 return (EINVAL); 1750 } 1751 1752 error = devfs_populate_vp(vp); 1753 if (error != 0) 1754 return (error); 1755 1756 de = vp->v_data; 1757 if (vp->v_type == VDIR) 1758 de = de->de_dir; 1759 1760 c = 0; 1761 if (vap->va_uid == (uid_t)VNOVAL) 1762 uid = de->de_uid; 1763 else 1764 uid = vap->va_uid; 1765 if (vap->va_gid == (gid_t)VNOVAL) 1766 gid = de->de_gid; 1767 else 1768 gid = vap->va_gid; 1769 if (uid != de->de_uid || gid != de->de_gid) { 1770 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1771 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1772 error = priv_check(td, PRIV_VFS_CHOWN); 1773 if (error != 0) 1774 goto ret; 1775 } 1776 de->de_uid = uid; 1777 de->de_gid = gid; 1778 c = 1; 1779 } 1780 1781 if (vap->va_mode != (mode_t)VNOVAL) { 1782 if (ap->a_cred->cr_uid != de->de_uid) { 1783 error = priv_check(td, PRIV_VFS_ADMIN); 1784 if (error != 0) 1785 goto ret; 1786 } 1787 de->de_mode = vap->va_mode; 1788 c = 1; 1789 } 1790 1791 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1792 error = vn_utimes_perm(vp, vap, ap->a_cred, td); 1793 if (error != 0) 1794 goto ret; 1795 if (vap->va_atime.tv_sec != VNOVAL) { 1796 if (vp->v_type == VCHR) 1797 vp->v_rdev->si_atime = vap->va_atime; 1798 else 1799 de->de_atime = vap->va_atime; 1800 } 1801 if (vap->va_mtime.tv_sec != VNOVAL) { 1802 if (vp->v_type == VCHR) 1803 vp->v_rdev->si_mtime = vap->va_mtime; 1804 else 1805 de->de_mtime = vap->va_mtime; 1806 } 1807 c = 1; 1808 } 1809 1810 if (c) { 1811 if (vp->v_type == VCHR) 1812 vfs_timestamp(&vp->v_rdev->si_ctime); 1813 else 1814 vfs_timestamp(&de->de_mtime); 1815 } 1816 1817 ret: 1818 sx_xunlock(&VFSTODEVFS(vp->v_mount)->dm_lock); 1819 return (error); 1820 } 1821 1822 #ifdef MAC 1823 static int 1824 devfs_setlabel(struct vop_setlabel_args *ap) 1825 { 1826 struct vnode *vp; 1827 struct devfs_dirent *de; 1828 1829 vp = ap->a_vp; 1830 de = vp->v_data; 1831 1832 mac_vnode_relabel(ap->a_cred, vp, ap->a_label); 1833 mac_devfs_update(vp->v_mount, de, vp); 1834 1835 return (0); 1836 } 1837 #endif 1838 1839 static int 1840 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred) 1841 { 1842 1843 return (vnops.fo_stat(fp, sb, cred)); 1844 } 1845 1846 static int 1847 devfs_symlink(struct vop_symlink_args *ap) 1848 { 1849 int i, error; 1850 struct devfs_dirent *dd; 1851 struct devfs_dirent *de, *de_covered, *de_dotdot; 1852 struct devfs_mount *dmp; 1853 1854 error = priv_check(curthread, PRIV_DEVFS_SYMLINK); 1855 if (error) 1856 return(error); 1857 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1858 if (devfs_populate_vp(ap->a_dvp) != 0) 1859 return (ENOENT); 1860 1861 dd = ap->a_dvp->v_data; 1862 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1863 de->de_flags = DE_USER; 1864 de->de_uid = 0; 1865 de->de_gid = 0; 1866 de->de_mode = 0755; 1867 de->de_inode = alloc_unr(devfs_inos); 1868 de->de_dir = dd; 1869 de->de_dirent->d_type = DT_LNK; 1870 i = strlen(ap->a_target) + 1; 1871 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1872 bcopy(ap->a_target, de->de_symlink, i); 1873 #ifdef MAC 1874 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1875 #endif 1876 de_covered = devfs_find(dd, de->de_dirent->d_name, 1877 de->de_dirent->d_namlen, 0); 1878 if (de_covered != NULL) { 1879 if ((de_covered->de_flags & DE_USER) != 0) { 1880 devfs_delete(dmp, de, DEVFS_DEL_NORECURSE); 1881 sx_xunlock(&dmp->dm_lock); 1882 return (EEXIST); 1883 } 1884 KASSERT((de_covered->de_flags & DE_COVERED) == 0, 1885 ("devfs_symlink: entry %p already covered", de_covered)); 1886 de_covered->de_flags |= DE_COVERED; 1887 } 1888 1889 de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */ 1890 de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */ 1891 TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list); 1892 devfs_dir_ref_de(dmp, dd); 1893 devfs_rules_apply(dmp, de); 1894 1895 return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp)); 1896 } 1897 1898 static int 1899 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) 1900 { 1901 1902 return (vnops.fo_truncate(fp, length, cred, td)); 1903 } 1904 1905 static int 1906 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, 1907 int flags, struct thread *td) 1908 { 1909 struct cdev *dev; 1910 int error, ioflag, ref; 1911 ssize_t resid; 1912 struct cdevsw *dsw; 1913 struct file *fpop; 1914 1915 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1916 return (EINVAL); 1917 fpop = td->td_fpop; 1918 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1919 if (error != 0) { 1920 error = vnops.fo_write(fp, uio, cred, flags, td); 1921 return (error); 1922 } 1923 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1924 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1925 if (ioflag & O_DIRECT) 1926 ioflag |= IO_DIRECT; 1927 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1928 1929 resid = uio->uio_resid; 1930 1931 error = dsw->d_write(dev, uio, ioflag); 1932 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1933 devfs_timestamp(&dev->si_ctime); 1934 dev->si_mtime = dev->si_ctime; 1935 } 1936 td->td_fpop = fpop; 1937 dev_relthread(dev, ref); 1938 1939 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_W); 1940 return (error); 1941 } 1942 1943 static int 1944 devfs_mmap_f(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size, 1945 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff, 1946 struct thread *td) 1947 { 1948 struct cdev *dev; 1949 struct cdevsw *dsw; 1950 struct mount *mp; 1951 struct vnode *vp; 1952 struct file *fpop; 1953 vm_object_t object; 1954 vm_prot_t maxprot; 1955 int error, ref; 1956 1957 vp = fp->f_vnode; 1958 1959 /* 1960 * Ensure that file and memory protections are 1961 * compatible. 1962 */ 1963 mp = vp->v_mount; 1964 if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0) { 1965 maxprot = VM_PROT_NONE; 1966 if ((prot & VM_PROT_EXECUTE) != 0) 1967 return (EACCES); 1968 } else 1969 maxprot = VM_PROT_EXECUTE; 1970 if ((fp->f_flag & FREAD) != 0) 1971 maxprot |= VM_PROT_READ; 1972 else if ((prot & VM_PROT_READ) != 0) 1973 return (EACCES); 1974 1975 /* 1976 * If we are sharing potential changes via MAP_SHARED and we 1977 * are trying to get write permission although we opened it 1978 * without asking for it, bail out. 1979 * 1980 * Note that most character devices always share mappings. 1981 * The one exception is that D_MMAP_ANON devices 1982 * (i.e. /dev/zero) permit private writable mappings. 1983 * 1984 * Rely on vm_mmap_cdev() to fail invalid MAP_PRIVATE requests 1985 * as well as updating maxprot to permit writing for 1986 * D_MMAP_ANON devices rather than doing that here. 1987 */ 1988 if ((flags & MAP_SHARED) != 0) { 1989 if ((fp->f_flag & FWRITE) != 0) 1990 maxprot |= VM_PROT_WRITE; 1991 else if ((prot & VM_PROT_WRITE) != 0) 1992 return (EACCES); 1993 } 1994 maxprot &= cap_maxprot; 1995 1996 fpop = td->td_fpop; 1997 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1998 if (error != 0) 1999 return (error); 2000 2001 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, dev, dsw, &foff, 2002 &object); 2003 td->td_fpop = fpop; 2004 dev_relthread(dev, ref); 2005 if (error != 0) 2006 return (error); 2007 2008 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object, 2009 foff, FALSE, td); 2010 if (error != 0) 2011 vm_object_deallocate(object); 2012 return (error); 2013 } 2014 2015 dev_t 2016 dev2udev(struct cdev *x) 2017 { 2018 if (x == NULL) 2019 return (NODEV); 2020 return (cdev2priv(x)->cdp_inode); 2021 } 2022 2023 static struct fileops devfs_ops_f = { 2024 .fo_read = devfs_read_f, 2025 .fo_write = devfs_write_f, 2026 .fo_truncate = devfs_truncate_f, 2027 .fo_ioctl = devfs_ioctl_f, 2028 .fo_poll = devfs_poll_f, 2029 .fo_kqfilter = devfs_kqfilter_f, 2030 .fo_stat = devfs_stat_f, 2031 .fo_close = devfs_close_f, 2032 .fo_chmod = vn_chmod, 2033 .fo_chown = vn_chown, 2034 .fo_sendfile = vn_sendfile, 2035 .fo_seek = vn_seek, 2036 .fo_fill_kinfo = vn_fill_kinfo, 2037 .fo_mmap = devfs_mmap_f, 2038 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 2039 }; 2040 2041 /* Vops for non-CHR vnodes in /dev. */ 2042 static struct vop_vector devfs_vnodeops = { 2043 .vop_default = &default_vnodeops, 2044 2045 .vop_access = devfs_access, 2046 .vop_getattr = devfs_getattr, 2047 .vop_ioctl = devfs_rioctl, 2048 .vop_lookup = devfs_lookup, 2049 .vop_mknod = devfs_mknod, 2050 .vop_pathconf = devfs_pathconf, 2051 .vop_read = devfs_rread, 2052 .vop_readdir = devfs_readdir, 2053 .vop_readlink = devfs_readlink, 2054 .vop_reclaim = devfs_reclaim, 2055 .vop_remove = devfs_remove, 2056 .vop_revoke = devfs_revoke, 2057 .vop_setattr = devfs_setattr, 2058 #ifdef MAC 2059 .vop_setlabel = devfs_setlabel, 2060 #endif 2061 .vop_symlink = devfs_symlink, 2062 .vop_vptocnp = devfs_vptocnp, 2063 .vop_lock1 = vop_lock, 2064 .vop_unlock = vop_unlock, 2065 .vop_islocked = vop_islocked, 2066 .vop_add_writecount = vop_stdadd_writecount_nomsync, 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 .vop_add_writecount = vop_stdadd_writecount_nomsync, 2109 }; 2110 VFS_VOP_VECTOR_REGISTER(devfs_specops); 2111 2112 /* 2113 * Our calling convention to the device drivers used to be that we passed 2114 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 2115 * flags instead since that's what open(), close() and ioctl() takes and 2116 * we don't really want vnode.h in device drivers. 2117 * We solved the source compatibility by redefining some vnode flags to 2118 * be the same as the fcntl ones and by sending down the bitwise OR of 2119 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 2120 * pulls the rug out under this. 2121 */ 2122 CTASSERT(O_NONBLOCK == IO_NDELAY); 2123 CTASSERT(O_FSYNC == IO_SYNC); 2124