1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 37 /* 38 * TODO: 39 * mkdir: want it ? 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/conf.h> 45 #include <sys/dirent.h> 46 #include <sys/eventhandler.h> 47 #include <sys/fcntl.h> 48 #include <sys/file.h> 49 #include <sys/filedesc.h> 50 #include <sys/filio.h> 51 #include <sys/jail.h> 52 #include <sys/kernel.h> 53 #include <sys/limits.h> 54 #include <sys/lock.h> 55 #include <sys/malloc.h> 56 #include <sys/mman.h> 57 #include <sys/mount.h> 58 #include <sys/namei.h> 59 #include <sys/priv.h> 60 #include <sys/proc.h> 61 #include <sys/stat.h> 62 #include <sys/sx.h> 63 #include <sys/sysctl.h> 64 #include <sys/time.h> 65 #include <sys/ttycom.h> 66 #include <sys/unistd.h> 67 #include <sys/vnode.h> 68 69 static struct vop_vector devfs_vnodeops; 70 static struct vop_vector devfs_specops; 71 static struct fileops devfs_ops_f; 72 73 #include <fs/devfs/devfs.h> 74 #include <fs/devfs/devfs_int.h> 75 76 #include <security/mac/mac_framework.h> 77 78 #include <vm/vm.h> 79 #include <vm/vm_extern.h> 80 #include <vm/vm_object.h> 81 82 static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data"); 83 84 struct mtx devfs_de_interlock; 85 MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF); 86 struct mtx cdevpriv_mtx; 87 MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF); 88 89 SYSCTL_DECL(_vfs_devfs); 90 91 static int devfs_dotimes; 92 SYSCTL_INT(_vfs_devfs, OID_AUTO, dotimes, CTLFLAG_RW, 93 &devfs_dotimes, 0, "Update timestamps on DEVFS with default precision"); 94 95 /* 96 * Update devfs node timestamp. Note that updates are unlocked and 97 * stat(2) could see partially updated times. 98 */ 99 static void 100 devfs_timestamp(struct timespec *tsp) 101 { 102 time_t ts; 103 104 if (devfs_dotimes) { 105 vfs_timestamp(tsp); 106 } else { 107 ts = time_second; 108 if (tsp->tv_sec != ts) { 109 tsp->tv_sec = ts; 110 tsp->tv_nsec = 0; 111 } 112 } 113 } 114 115 static int 116 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp, 117 int *ref) 118 { 119 *dswp = devvn_refthread(fp->f_vnode, devp, ref); 120 if (*dswp == NULL || *devp != fp->f_data) { 121 if (*dswp != NULL) 122 dev_relthread(*devp, *ref); 123 return (ENXIO); 124 } 125 KASSERT((*devp)->si_refcount > 0, 126 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp))); 127 if (*dswp == NULL) 128 return (ENXIO); 129 curthread->td_fpop = fp; 130 return (0); 131 } 132 133 int 134 devfs_get_cdevpriv(void **datap) 135 { 136 struct file *fp; 137 struct cdev_privdata *p; 138 int error; 139 140 fp = curthread->td_fpop; 141 if (fp == NULL) 142 return (EBADF); 143 p = fp->f_cdevpriv; 144 if (p != NULL) { 145 error = 0; 146 *datap = p->cdpd_data; 147 } else 148 error = ENOENT; 149 return (error); 150 } 151 152 int 153 devfs_set_cdevpriv(void *priv, d_priv_dtor_t *priv_dtr) 154 { 155 struct file *fp; 156 struct cdev_priv *cdp; 157 struct cdev_privdata *p; 158 int error; 159 160 fp = curthread->td_fpop; 161 if (fp == NULL) 162 return (ENOENT); 163 cdp = cdev2priv((struct cdev *)fp->f_data); 164 p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK); 165 p->cdpd_data = priv; 166 p->cdpd_dtr = priv_dtr; 167 p->cdpd_fp = fp; 168 mtx_lock(&cdevpriv_mtx); 169 if (fp->f_cdevpriv == NULL) { 170 LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list); 171 fp->f_cdevpriv = p; 172 mtx_unlock(&cdevpriv_mtx); 173 error = 0; 174 } else { 175 mtx_unlock(&cdevpriv_mtx); 176 free(p, M_CDEVPDATA); 177 error = EBUSY; 178 } 179 return (error); 180 } 181 182 int 183 devfs_foreach_cdevpriv(struct cdev *dev, int (*cb)(void *data, void *arg), 184 void *arg) 185 { 186 struct cdev_priv *cdp; 187 struct cdev_privdata *p; 188 int error; 189 190 cdp = cdev2priv(dev); 191 error = 0; 192 mtx_lock(&cdevpriv_mtx); 193 LIST_FOREACH(p, &cdp->cdp_fdpriv, cdpd_list) { 194 error = cb(p->cdpd_data, arg); 195 if (error != 0) 196 break; 197 } 198 mtx_unlock(&cdevpriv_mtx); 199 return (error); 200 } 201 202 void 203 devfs_destroy_cdevpriv(struct cdev_privdata *p) 204 { 205 206 mtx_assert(&cdevpriv_mtx, MA_OWNED); 207 KASSERT(p->cdpd_fp->f_cdevpriv == p, 208 ("devfs_destoy_cdevpriv %p != %p", p->cdpd_fp->f_cdevpriv, p)); 209 p->cdpd_fp->f_cdevpriv = NULL; 210 LIST_REMOVE(p, cdpd_list); 211 mtx_unlock(&cdevpriv_mtx); 212 (p->cdpd_dtr)(p->cdpd_data); 213 free(p, M_CDEVPDATA); 214 } 215 216 static void 217 devfs_fpdrop(struct file *fp) 218 { 219 struct cdev_privdata *p; 220 221 mtx_lock(&cdevpriv_mtx); 222 if ((p = fp->f_cdevpriv) == NULL) { 223 mtx_unlock(&cdevpriv_mtx); 224 return; 225 } 226 devfs_destroy_cdevpriv(p); 227 } 228 229 void 230 devfs_clear_cdevpriv(void) 231 { 232 struct file *fp; 233 234 fp = curthread->td_fpop; 235 if (fp == NULL) 236 return; 237 devfs_fpdrop(fp); 238 } 239 240 static void 241 devfs_usecount_add(struct vnode *vp) 242 { 243 struct devfs_dirent *de; 244 struct cdev *dev; 245 246 mtx_lock(&devfs_de_interlock); 247 VI_LOCK(vp); 248 VNPASS(vp->v_type == VCHR || vp->v_type == VBAD, vp); 249 if (VN_IS_DOOMED(vp)) { 250 goto out_unlock; 251 } 252 253 de = vp->v_data; 254 dev = vp->v_rdev; 255 MPASS(de != NULL); 256 MPASS(dev != NULL); 257 dev->si_usecount++; 258 de->de_usecount++; 259 out_unlock: 260 VI_UNLOCK(vp); 261 mtx_unlock(&devfs_de_interlock); 262 } 263 264 static void 265 devfs_usecount_subl(struct vnode *vp) 266 { 267 struct devfs_dirent *de; 268 struct cdev *dev; 269 270 mtx_assert(&devfs_de_interlock, MA_OWNED); 271 ASSERT_VI_LOCKED(vp, __func__); 272 VNPASS(vp->v_type == VCHR || vp->v_type == VBAD, vp); 273 274 de = vp->v_data; 275 dev = vp->v_rdev; 276 if (de == NULL) 277 return; 278 if (dev == NULL) { 279 MPASS(de->de_usecount == 0); 280 return; 281 } 282 if (dev->si_usecount < de->de_usecount) 283 panic("%s: si_usecount underflow for dev %p " 284 "(has %ld, dirent has %d)\n", 285 __func__, dev, dev->si_usecount, de->de_usecount); 286 if (VN_IS_DOOMED(vp)) { 287 dev->si_usecount -= de->de_usecount; 288 de->de_usecount = 0; 289 } else { 290 if (de->de_usecount == 0) 291 panic("%s: de_usecount underflow for dev %p\n", 292 __func__, dev); 293 dev->si_usecount--; 294 de->de_usecount--; 295 } 296 } 297 298 static void 299 devfs_usecount_sub(struct vnode *vp) 300 { 301 302 mtx_lock(&devfs_de_interlock); 303 VI_LOCK(vp); 304 devfs_usecount_subl(vp); 305 VI_UNLOCK(vp); 306 mtx_unlock(&devfs_de_interlock); 307 } 308 309 static int 310 devfs_usecountl(struct vnode *vp) 311 { 312 313 VNPASS(vp->v_type == VCHR, vp); 314 mtx_assert(&devfs_de_interlock, MA_OWNED); 315 ASSERT_VI_LOCKED(vp, __func__); 316 return (vp->v_rdev->si_usecount); 317 } 318 319 int 320 devfs_usecount(struct vnode *vp) 321 { 322 int count; 323 324 VNPASS(vp->v_type == VCHR, vp); 325 mtx_lock(&devfs_de_interlock); 326 VI_LOCK(vp); 327 count = devfs_usecountl(vp); 328 VI_UNLOCK(vp); 329 mtx_unlock(&devfs_de_interlock); 330 return (count); 331 } 332 333 void 334 devfs_ctty_ref(struct vnode *vp) 335 { 336 337 vrefact(vp); 338 devfs_usecount_add(vp); 339 } 340 341 void 342 devfs_ctty_unref(struct vnode *vp) 343 { 344 345 devfs_usecount_sub(vp); 346 vrele(vp); 347 } 348 349 /* 350 * On success devfs_populate_vp() returns with dmp->dm_lock held. 351 */ 352 static int 353 devfs_populate_vp(struct vnode *vp) 354 { 355 struct devfs_dirent *de; 356 struct devfs_mount *dmp; 357 int locked; 358 359 ASSERT_VOP_LOCKED(vp, "devfs_populate_vp"); 360 361 dmp = VFSTODEVFS(vp->v_mount); 362 if (!devfs_populate_needed(dmp)) { 363 sx_xlock(&dmp->dm_lock); 364 goto out_nopopulate; 365 } 366 367 locked = VOP_ISLOCKED(vp); 368 369 sx_xlock(&dmp->dm_lock); 370 DEVFS_DMP_HOLD(dmp); 371 372 /* Can't call devfs_populate() with the vnode lock held. */ 373 VOP_UNLOCK(vp); 374 devfs_populate(dmp); 375 376 sx_xunlock(&dmp->dm_lock); 377 vn_lock(vp, locked | LK_RETRY); 378 sx_xlock(&dmp->dm_lock); 379 if (DEVFS_DMP_DROP(dmp)) { 380 sx_xunlock(&dmp->dm_lock); 381 devfs_unmount_final(dmp); 382 return (ERESTART); 383 } 384 out_nopopulate: 385 if (VN_IS_DOOMED(vp)) { 386 sx_xunlock(&dmp->dm_lock); 387 return (ERESTART); 388 } 389 de = vp->v_data; 390 KASSERT(de != NULL, 391 ("devfs_populate_vp: vp->v_data == NULL but vnode not doomed")); 392 if ((de->de_flags & DE_DOOMED) != 0) { 393 sx_xunlock(&dmp->dm_lock); 394 return (ERESTART); 395 } 396 397 return (0); 398 } 399 400 static int 401 devfs_vptocnp(struct vop_vptocnp_args *ap) 402 { 403 struct vnode *vp = ap->a_vp; 404 struct vnode **dvp = ap->a_vpp; 405 struct devfs_mount *dmp; 406 char *buf = ap->a_buf; 407 size_t *buflen = ap->a_buflen; 408 struct devfs_dirent *dd, *de; 409 int i, error; 410 411 dmp = VFSTODEVFS(vp->v_mount); 412 413 error = devfs_populate_vp(vp); 414 if (error != 0) 415 return (error); 416 417 if (vp->v_type != VCHR && vp->v_type != VDIR) { 418 error = ENOENT; 419 goto finished; 420 } 421 422 dd = vp->v_data; 423 if (vp->v_type == VDIR && dd == dmp->dm_rootdir) { 424 *dvp = vp; 425 vref(*dvp); 426 goto finished; 427 } 428 429 i = *buflen; 430 i -= dd->de_dirent->d_namlen; 431 if (i < 0) { 432 error = ENOMEM; 433 goto finished; 434 } 435 bcopy(dd->de_dirent->d_name, buf + i, dd->de_dirent->d_namlen); 436 *buflen = i; 437 de = devfs_parent_dirent(dd); 438 if (de == NULL) { 439 error = ENOENT; 440 goto finished; 441 } 442 mtx_lock(&devfs_de_interlock); 443 *dvp = de->de_vnode; 444 if (*dvp != NULL) { 445 VI_LOCK(*dvp); 446 mtx_unlock(&devfs_de_interlock); 447 vholdl(*dvp); 448 VI_UNLOCK(*dvp); 449 vref(*dvp); 450 vdrop(*dvp); 451 } else { 452 mtx_unlock(&devfs_de_interlock); 453 error = ENOENT; 454 } 455 finished: 456 sx_xunlock(&dmp->dm_lock); 457 return (error); 458 } 459 460 /* 461 * Construct the fully qualified path name relative to the mountpoint. 462 * If a NULL cnp is provided, no '/' is appended to the resulting path. 463 */ 464 char * 465 devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd, 466 struct componentname *cnp) 467 { 468 int i; 469 struct devfs_dirent *de; 470 471 sx_assert(&dmp->dm_lock, SA_LOCKED); 472 473 i = SPECNAMELEN; 474 buf[i] = '\0'; 475 if (cnp != NULL) 476 i -= cnp->cn_namelen; 477 if (i < 0) 478 return (NULL); 479 if (cnp != NULL) 480 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); 481 de = dd; 482 while (de != dmp->dm_rootdir) { 483 if (cnp != NULL || i < SPECNAMELEN) { 484 i--; 485 if (i < 0) 486 return (NULL); 487 buf[i] = '/'; 488 } 489 i -= de->de_dirent->d_namlen; 490 if (i < 0) 491 return (NULL); 492 bcopy(de->de_dirent->d_name, buf + i, 493 de->de_dirent->d_namlen); 494 de = devfs_parent_dirent(de); 495 if (de == NULL) 496 return (NULL); 497 } 498 return (buf + i); 499 } 500 501 static int 502 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp, 503 struct devfs_dirent *de) 504 { 505 int not_found; 506 507 not_found = 0; 508 if (de->de_flags & DE_DOOMED) 509 not_found = 1; 510 if (DEVFS_DE_DROP(de)) { 511 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed")); 512 devfs_dirent_free(de); 513 } 514 if (DEVFS_DMP_DROP(dmp)) { 515 KASSERT(not_found == 1, 516 ("DEVFS mount struct freed before dirent")); 517 not_found = 2; 518 sx_xunlock(&dmp->dm_lock); 519 devfs_unmount_final(dmp); 520 } 521 if (not_found == 1 || (drop_dm_lock && not_found != 2)) 522 sx_unlock(&dmp->dm_lock); 523 return (not_found); 524 } 525 526 /* 527 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops 528 * it on return. 529 */ 530 int 531 devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode, 532 struct vnode **vpp) 533 { 534 int error; 535 struct vnode *vp; 536 struct cdev *dev; 537 struct devfs_mount *dmp; 538 struct cdevsw *dsw; 539 enum vgetstate vs; 540 541 dmp = VFSTODEVFS(mp); 542 if (de->de_flags & DE_DOOMED) { 543 sx_xunlock(&dmp->dm_lock); 544 return (ENOENT); 545 } 546 loop: 547 DEVFS_DE_HOLD(de); 548 DEVFS_DMP_HOLD(dmp); 549 mtx_lock(&devfs_de_interlock); 550 vp = de->de_vnode; 551 if (vp != NULL) { 552 vs = vget_prep(vp); 553 mtx_unlock(&devfs_de_interlock); 554 sx_xunlock(&dmp->dm_lock); 555 vget_finish(vp, lockmode | LK_RETRY, vs); 556 sx_xlock(&dmp->dm_lock); 557 if (devfs_allocv_drop_refs(0, dmp, de)) { 558 vput(vp); 559 return (ENOENT); 560 } else if (VN_IS_DOOMED(vp)) { 561 mtx_lock(&devfs_de_interlock); 562 if (de->de_vnode == vp) { 563 de->de_vnode = NULL; 564 vp->v_data = NULL; 565 } 566 mtx_unlock(&devfs_de_interlock); 567 vput(vp); 568 goto loop; 569 } 570 sx_xunlock(&dmp->dm_lock); 571 *vpp = vp; 572 return (0); 573 } 574 mtx_unlock(&devfs_de_interlock); 575 if (de->de_dirent->d_type == DT_CHR) { 576 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { 577 devfs_allocv_drop_refs(1, dmp, de); 578 return (ENOENT); 579 } 580 dev = &de->de_cdp->cdp_c; 581 } else { 582 dev = NULL; 583 } 584 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 585 if (error != 0) { 586 devfs_allocv_drop_refs(1, dmp, de); 587 printf("devfs_allocv: failed to allocate new vnode\n"); 588 return (error); 589 } 590 591 if (de->de_dirent->d_type == DT_CHR) { 592 vp->v_type = VCHR; 593 VI_LOCK(vp); 594 dev_lock(); 595 dev_refl(dev); 596 /* XXX: v_rdev should be protect by vnode lock */ 597 vp->v_rdev = dev; 598 VNPASS(vp->v_usecount == 1, vp); 599 /* Special casing of ttys for deadfs. Probably redundant. */ 600 dsw = dev->si_devsw; 601 if (dsw != NULL && (dsw->d_flags & D_TTY) != 0) 602 vp->v_vflag |= VV_ISTTY; 603 dev_unlock(); 604 VI_UNLOCK(vp); 605 if ((dev->si_flags & SI_ETERNAL) != 0) 606 vp->v_vflag |= VV_ETERNALDEV; 607 vp->v_op = &devfs_specops; 608 } else if (de->de_dirent->d_type == DT_DIR) { 609 vp->v_type = VDIR; 610 } else if (de->de_dirent->d_type == DT_LNK) { 611 vp->v_type = VLNK; 612 } else { 613 vp->v_type = VBAD; 614 } 615 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS); 616 VN_LOCK_ASHARE(vp); 617 mtx_lock(&devfs_de_interlock); 618 vp->v_data = de; 619 de->de_vnode = vp; 620 mtx_unlock(&devfs_de_interlock); 621 error = insmntque1(vp, mp); 622 if (error != 0) { 623 mtx_lock(&devfs_de_interlock); 624 vp->v_data = NULL; 625 de->de_vnode = NULL; 626 mtx_unlock(&devfs_de_interlock); 627 vgone(vp); 628 vput(vp); 629 (void) devfs_allocv_drop_refs(1, dmp, de); 630 return (error); 631 } 632 if (devfs_allocv_drop_refs(0, dmp, de)) { 633 vgone(vp); 634 vput(vp); 635 return (ENOENT); 636 } 637 #ifdef MAC 638 mac_devfs_vnode_associate(mp, de, vp); 639 #endif 640 sx_xunlock(&dmp->dm_lock); 641 vn_set_state(vp, VSTATE_CONSTRUCTED); 642 *vpp = vp; 643 return (0); 644 } 645 646 static int 647 devfs_access(struct vop_access_args *ap) 648 { 649 struct vnode *vp = ap->a_vp; 650 struct devfs_dirent *de; 651 struct proc *p; 652 int error; 653 654 de = vp->v_data; 655 if (vp->v_type == VDIR) 656 de = de->de_dir; 657 658 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 659 ap->a_accmode, ap->a_cred); 660 if (error == 0) 661 return (0); 662 if (error != EACCES) 663 return (error); 664 p = ap->a_td->td_proc; 665 /* We do, however, allow access to the controlling terminal */ 666 PROC_LOCK(p); 667 if (!(p->p_flag & P_CONTROLT)) { 668 PROC_UNLOCK(p); 669 return (error); 670 } 671 if (p->p_session->s_ttydp == de->de_cdp) 672 error = 0; 673 PROC_UNLOCK(p); 674 return (error); 675 } 676 677 _Static_assert(((FMASK | FCNTLFLAGS) & (FLASTCLOSE | FREVOKE)) == 0, 678 "devfs-only flag reuse failed"); 679 680 static int 681 devfs_close(struct vop_close_args *ap) 682 { 683 struct vnode *vp = ap->a_vp, *oldvp; 684 struct thread *td = ap->a_td; 685 struct proc *p; 686 struct cdev *dev = vp->v_rdev; 687 struct cdevsw *dsw; 688 struct devfs_dirent *de = vp->v_data; 689 int dflags, error, ref, vp_locked; 690 691 /* 692 * XXX: Don't call d_close() if we were called because of 693 * XXX: insmntque() failure. 694 */ 695 if (vp->v_data == NULL) 696 return (0); 697 698 /* 699 * Hack: a tty device that is a controlling terminal 700 * has a reference from the session structure. 701 * We cannot easily tell that a character device is 702 * a controlling terminal, unless it is the closing 703 * process' controlling terminal. In that case, 704 * if the reference count is 2 (this last descriptor 705 * plus the session), release the reference from the session. 706 */ 707 if (de->de_usecount == 2 && td != NULL) { 708 p = td->td_proc; 709 PROC_LOCK(p); 710 if (vp == p->p_session->s_ttyvp) { 711 PROC_UNLOCK(p); 712 oldvp = NULL; 713 sx_xlock(&proctree_lock); 714 if (vp == p->p_session->s_ttyvp) { 715 SESS_LOCK(p->p_session); 716 mtx_lock(&devfs_de_interlock); 717 VI_LOCK(vp); 718 if (devfs_usecountl(vp) == 2 && !VN_IS_DOOMED(vp)) { 719 p->p_session->s_ttyvp = NULL; 720 p->p_session->s_ttydp = NULL; 721 oldvp = vp; 722 } 723 VI_UNLOCK(vp); 724 mtx_unlock(&devfs_de_interlock); 725 SESS_UNLOCK(p->p_session); 726 } 727 sx_xunlock(&proctree_lock); 728 if (oldvp != NULL) 729 devfs_ctty_unref(oldvp); 730 } else 731 PROC_UNLOCK(p); 732 } 733 /* 734 * We do not want to really close the device if it 735 * is still in use unless we are trying to close it 736 * forcibly. Since every use (buffer, vnode, swap, cmap) 737 * holds a reference to the vnode, and because we mark 738 * any other vnodes that alias this device, when the 739 * sum of the reference counts on all the aliased 740 * vnodes descends to one, we are on last close. 741 */ 742 dsw = dev_refthread(dev, &ref); 743 if (dsw == NULL) 744 return (ENXIO); 745 dflags = 0; 746 mtx_lock(&devfs_de_interlock); 747 VI_LOCK(vp); 748 if (devfs_usecountl(vp) == 1) 749 dflags |= FLASTCLOSE; 750 devfs_usecount_subl(vp); 751 mtx_unlock(&devfs_de_interlock); 752 if (VN_IS_DOOMED(vp)) { 753 /* Forced close. */ 754 dflags |= FREVOKE | FNONBLOCK; 755 } else if (dsw->d_flags & D_TRACKCLOSE) { 756 /* Keep device updated on status. */ 757 } else if ((dflags & FLASTCLOSE) == 0) { 758 VI_UNLOCK(vp); 759 dev_relthread(dev, ref); 760 return (0); 761 } 762 vholdnz(vp); 763 VI_UNLOCK(vp); 764 vp_locked = VOP_ISLOCKED(vp); 765 VOP_UNLOCK(vp); 766 KASSERT(dev->si_refcount > 0, 767 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 768 error = dsw->d_close(dev, ap->a_fflag | dflags, S_IFCHR, td); 769 dev_relthread(dev, ref); 770 vn_lock(vp, vp_locked | LK_RETRY); 771 vdrop(vp); 772 return (error); 773 } 774 775 static int 776 devfs_close_f(struct file *fp, struct thread *td) 777 { 778 int error; 779 struct file *fpop; 780 781 /* 782 * NB: td may be NULL if this descriptor is closed due to 783 * garbage collection from a closed UNIX domain socket. 784 */ 785 fpop = curthread->td_fpop; 786 curthread->td_fpop = fp; 787 error = vnops.fo_close(fp, td); 788 curthread->td_fpop = fpop; 789 790 /* 791 * The f_cdevpriv cannot be assigned non-NULL value while we 792 * are destroying the file. 793 */ 794 if (fp->f_cdevpriv != NULL) 795 devfs_fpdrop(fp); 796 return (error); 797 } 798 799 static int 800 devfs_getattr(struct vop_getattr_args *ap) 801 { 802 struct vnode *vp = ap->a_vp; 803 struct vattr *vap = ap->a_vap; 804 struct devfs_dirent *de; 805 struct devfs_mount *dmp; 806 struct cdev *dev; 807 struct timeval boottime; 808 int error; 809 810 error = devfs_populate_vp(vp); 811 if (error != 0) 812 return (error); 813 814 dmp = VFSTODEVFS(vp->v_mount); 815 sx_xunlock(&dmp->dm_lock); 816 817 de = vp->v_data; 818 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 819 if (vp->v_type == VDIR) { 820 de = de->de_dir; 821 KASSERT(de != NULL, 822 ("Null dir dirent in devfs_getattr vp=%p", vp)); 823 } 824 vap->va_uid = de->de_uid; 825 vap->va_gid = de->de_gid; 826 vap->va_mode = de->de_mode; 827 if (vp->v_type == VLNK) 828 vap->va_size = strlen(de->de_symlink); 829 else if (vp->v_type == VDIR) 830 vap->va_size = vap->va_bytes = DEV_BSIZE; 831 else 832 vap->va_size = 0; 833 if (vp->v_type != VDIR) 834 vap->va_bytes = 0; 835 vap->va_blocksize = DEV_BSIZE; 836 vap->va_type = vp->v_type; 837 838 getboottime(&boottime); 839 #define fix(aa) \ 840 do { \ 841 if ((aa).tv_sec <= 3600) { \ 842 (aa).tv_sec = boottime.tv_sec; \ 843 (aa).tv_nsec = boottime.tv_usec * 1000; \ 844 } \ 845 } while (0) 846 847 if (vp->v_type != VCHR) { 848 fix(de->de_atime); 849 vap->va_atime = de->de_atime; 850 fix(de->de_mtime); 851 vap->va_mtime = de->de_mtime; 852 fix(de->de_ctime); 853 vap->va_ctime = de->de_ctime; 854 } else { 855 dev = vp->v_rdev; 856 fix(dev->si_atime); 857 vap->va_atime = dev->si_atime; 858 fix(dev->si_mtime); 859 vap->va_mtime = dev->si_mtime; 860 fix(dev->si_ctime); 861 vap->va_ctime = dev->si_ctime; 862 863 vap->va_rdev = cdev2priv(dev)->cdp_inode; 864 } 865 vap->va_gen = 0; 866 vap->va_flags = 0; 867 vap->va_filerev = 0; 868 vap->va_nlink = de->de_links; 869 vap->va_fileid = de->de_inode; 870 871 return (error); 872 } 873 874 /* ARGSUSED */ 875 static int 876 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 877 { 878 struct file *fpop; 879 int error; 880 881 fpop = td->td_fpop; 882 td->td_fpop = fp; 883 error = vnops.fo_ioctl(fp, com, data, cred, td); 884 td->td_fpop = fpop; 885 return (error); 886 } 887 888 void * 889 fiodgname_buf_get_ptr(void *fgnp, u_long com) 890 { 891 union { 892 struct fiodgname_arg fgn; 893 #ifdef COMPAT_FREEBSD32 894 struct fiodgname_arg32 fgn32; 895 #endif 896 } *fgnup; 897 898 fgnup = fgnp; 899 switch (com) { 900 case FIODGNAME: 901 return (fgnup->fgn.buf); 902 #ifdef COMPAT_FREEBSD32 903 case FIODGNAME_32: 904 return ((void *)(uintptr_t)fgnup->fgn32.buf); 905 #endif 906 default: 907 panic("Unhandled ioctl command %ld", com); 908 } 909 } 910 911 static int 912 devfs_ioctl(struct vop_ioctl_args *ap) 913 { 914 struct fiodgname_arg *fgn; 915 struct vnode *vpold, *vp; 916 struct cdevsw *dsw; 917 struct thread *td; 918 struct session *sess; 919 struct cdev *dev; 920 int error, ref, i; 921 const char *p; 922 u_long com; 923 924 vp = ap->a_vp; 925 com = ap->a_command; 926 td = ap->a_td; 927 928 dsw = devvn_refthread(vp, &dev, &ref); 929 if (dsw == NULL) 930 return (ENXIO); 931 KASSERT(dev->si_refcount > 0, 932 ("devfs: un-referenced struct cdev *(%s)", devtoname(dev))); 933 934 switch (com) { 935 case FIODTYPE: 936 *(int *)ap->a_data = dsw->d_flags & D_TYPEMASK; 937 error = 0; 938 break; 939 case FIODGNAME: 940 #ifdef COMPAT_FREEBSD32 941 case FIODGNAME_32: 942 #endif 943 fgn = ap->a_data; 944 p = devtoname(dev); 945 i = strlen(p) + 1; 946 if (i > fgn->len) 947 error = EINVAL; 948 else 949 error = copyout(p, fiodgname_buf_get_ptr(fgn, com), i); 950 break; 951 default: 952 error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td); 953 } 954 955 dev_relthread(dev, ref); 956 if (error == ENOIOCTL) 957 error = ENOTTY; 958 959 if (error == 0 && com == TIOCSCTTY) { 960 /* 961 * Do nothing if reassigning same control tty, or if the 962 * control tty has already disappeared. If it disappeared, 963 * it's because we were racing with TIOCNOTTY. TIOCNOTTY 964 * already took care of releasing the old vnode and we have 965 * nothing left to do. 966 */ 967 sx_slock(&proctree_lock); 968 sess = td->td_proc->p_session; 969 if (sess->s_ttyvp == vp || sess->s_ttyp == NULL) { 970 sx_sunlock(&proctree_lock); 971 return (0); 972 } 973 974 devfs_ctty_ref(vp); 975 SESS_LOCK(sess); 976 vpold = sess->s_ttyvp; 977 sess->s_ttyvp = vp; 978 sess->s_ttydp = cdev2priv(dev); 979 SESS_UNLOCK(sess); 980 981 sx_sunlock(&proctree_lock); 982 983 /* Get rid of reference to old control tty */ 984 if (vpold) 985 devfs_ctty_unref(vpold); 986 } 987 return (error); 988 } 989 990 /* ARGSUSED */ 991 static int 992 devfs_kqfilter_f(struct file *fp, struct knote *kn) 993 { 994 struct cdev *dev; 995 struct cdevsw *dsw; 996 int error, ref; 997 struct file *fpop; 998 struct thread *td; 999 1000 td = curthread; 1001 fpop = td->td_fpop; 1002 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1003 if (error) 1004 return (error); 1005 error = dsw->d_kqfilter(dev, kn); 1006 td->td_fpop = fpop; 1007 dev_relthread(dev, ref); 1008 return (error); 1009 } 1010 1011 static inline int 1012 devfs_prison_check(struct devfs_dirent *de, struct thread *td) 1013 { 1014 struct cdev_priv *cdp; 1015 struct ucred *dcr; 1016 struct proc *p; 1017 int error; 1018 1019 cdp = de->de_cdp; 1020 if (cdp == NULL) 1021 return (0); 1022 dcr = cdp->cdp_c.si_cred; 1023 if (dcr == NULL) 1024 return (0); 1025 1026 error = prison_check(td->td_ucred, dcr); 1027 if (error == 0) 1028 return (0); 1029 /* We do, however, allow access to the controlling terminal */ 1030 p = td->td_proc; 1031 PROC_LOCK(p); 1032 if (!(p->p_flag & P_CONTROLT)) { 1033 PROC_UNLOCK(p); 1034 return (error); 1035 } 1036 if (p->p_session->s_ttydp == cdp) 1037 error = 0; 1038 PROC_UNLOCK(p); 1039 return (error); 1040 } 1041 1042 static int 1043 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 1044 { 1045 struct componentname *cnp; 1046 struct vnode *dvp, **vpp; 1047 struct thread *td; 1048 struct devfs_dirent *de, *dd; 1049 struct devfs_dirent **dde; 1050 struct devfs_mount *dmp; 1051 struct mount *mp; 1052 struct cdev *cdev; 1053 int error, flags, nameiop, dvplocked; 1054 char specname[SPECNAMELEN + 1], *pname; 1055 1056 td = curthread; 1057 cnp = ap->a_cnp; 1058 vpp = ap->a_vpp; 1059 dvp = ap->a_dvp; 1060 pname = cnp->cn_nameptr; 1061 flags = cnp->cn_flags; 1062 nameiop = cnp->cn_nameiop; 1063 mp = dvp->v_mount; 1064 dmp = VFSTODEVFS(mp); 1065 dd = dvp->v_data; 1066 *vpp = NULLVP; 1067 1068 if ((flags & ISLASTCN) && nameiop == RENAME) 1069 return (EOPNOTSUPP); 1070 1071 if (dvp->v_type != VDIR) 1072 return (ENOTDIR); 1073 1074 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 1075 return (EIO); 1076 1077 error = vn_dir_check_exec(dvp, cnp); 1078 if (error != 0) 1079 return (error); 1080 1081 if (cnp->cn_namelen == 1 && *pname == '.') { 1082 if ((flags & ISLASTCN) && nameiop != LOOKUP) 1083 return (EINVAL); 1084 *vpp = dvp; 1085 VREF(dvp); 1086 return (0); 1087 } 1088 1089 if (flags & ISDOTDOT) { 1090 if ((flags & ISLASTCN) && nameiop != LOOKUP) 1091 return (EINVAL); 1092 de = devfs_parent_dirent(dd); 1093 if (de == NULL) 1094 return (ENOENT); 1095 dvplocked = VOP_ISLOCKED(dvp); 1096 VOP_UNLOCK(dvp); 1097 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, 1098 vpp); 1099 *dm_unlock = 0; 1100 vn_lock(dvp, dvplocked | LK_RETRY); 1101 return (error); 1102 } 1103 1104 dd = dvp->v_data; 1105 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0); 1106 while (de == NULL) { /* While(...) so we can use break */ 1107 1108 if (nameiop == DELETE) 1109 return (ENOENT); 1110 1111 /* 1112 * OK, we didn't have an entry for the name we were asked for 1113 * so we try to see if anybody can create it on demand. 1114 */ 1115 pname = devfs_fqpn(specname, dmp, dd, cnp); 1116 if (pname == NULL) 1117 break; 1118 1119 cdev = NULL; 1120 DEVFS_DMP_HOLD(dmp); 1121 sx_xunlock(&dmp->dm_lock); 1122 EVENTHANDLER_INVOKE(dev_clone, 1123 td->td_ucred, pname, strlen(pname), &cdev); 1124 1125 if (cdev == NULL) 1126 sx_xlock(&dmp->dm_lock); 1127 else if (devfs_populate_vp(dvp) != 0) { 1128 *dm_unlock = 0; 1129 sx_xlock(&dmp->dm_lock); 1130 if (DEVFS_DMP_DROP(dmp)) { 1131 sx_xunlock(&dmp->dm_lock); 1132 devfs_unmount_final(dmp); 1133 } else 1134 sx_xunlock(&dmp->dm_lock); 1135 dev_rel(cdev); 1136 return (ENOENT); 1137 } 1138 if (DEVFS_DMP_DROP(dmp)) { 1139 *dm_unlock = 0; 1140 sx_xunlock(&dmp->dm_lock); 1141 devfs_unmount_final(dmp); 1142 if (cdev != NULL) 1143 dev_rel(cdev); 1144 return (ENOENT); 1145 } 1146 1147 if (cdev == NULL) 1148 break; 1149 1150 dev_lock(); 1151 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx]; 1152 if (dde != NULL && *dde != NULL) 1153 de = *dde; 1154 dev_unlock(); 1155 dev_rel(cdev); 1156 break; 1157 } 1158 1159 if (de == NULL || de->de_flags & DE_WHITEOUT) { 1160 if ((nameiop == CREATE || nameiop == RENAME) && 1161 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 1162 return (EJUSTRETURN); 1163 } 1164 return (ENOENT); 1165 } 1166 1167 if (devfs_prison_check(de, td)) 1168 return (ENOENT); 1169 1170 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 1171 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 1172 if (error) 1173 return (error); 1174 if (*vpp == dvp) { 1175 VREF(dvp); 1176 *vpp = dvp; 1177 return (0); 1178 } 1179 } 1180 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, vpp); 1181 *dm_unlock = 0; 1182 return (error); 1183 } 1184 1185 static int 1186 devfs_lookup(struct vop_lookup_args *ap) 1187 { 1188 int j; 1189 struct devfs_mount *dmp; 1190 int dm_unlock; 1191 1192 if (devfs_populate_vp(ap->a_dvp) != 0) 1193 return (ENOTDIR); 1194 1195 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1196 dm_unlock = 1; 1197 j = devfs_lookupx(ap, &dm_unlock); 1198 if (dm_unlock == 1) 1199 sx_xunlock(&dmp->dm_lock); 1200 return (j); 1201 } 1202 1203 static int 1204 devfs_mknod(struct vop_mknod_args *ap) 1205 { 1206 struct componentname *cnp; 1207 struct vnode *dvp, **vpp; 1208 struct devfs_dirent *dd, *de; 1209 struct devfs_mount *dmp; 1210 int error; 1211 1212 /* 1213 * The only type of node we should be creating here is a 1214 * character device, for anything else return EOPNOTSUPP. 1215 */ 1216 if (ap->a_vap->va_type != VCHR) 1217 return (EOPNOTSUPP); 1218 dvp = ap->a_dvp; 1219 dmp = VFSTODEVFS(dvp->v_mount); 1220 1221 cnp = ap->a_cnp; 1222 vpp = ap->a_vpp; 1223 dd = dvp->v_data; 1224 1225 error = ENOENT; 1226 sx_xlock(&dmp->dm_lock); 1227 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 1228 if (cnp->cn_namelen != de->de_dirent->d_namlen) 1229 continue; 1230 if (de->de_dirent->d_type == DT_CHR && 1231 (de->de_cdp->cdp_flags & CDP_ACTIVE) == 0) 1232 continue; 1233 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 1234 de->de_dirent->d_namlen) != 0) 1235 continue; 1236 if (de->de_flags & DE_WHITEOUT) 1237 break; 1238 goto notfound; 1239 } 1240 if (de == NULL) 1241 goto notfound; 1242 de->de_flags &= ~DE_WHITEOUT; 1243 error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp); 1244 return (error); 1245 notfound: 1246 sx_xunlock(&dmp->dm_lock); 1247 return (error); 1248 } 1249 1250 /* ARGSUSED */ 1251 static int 1252 devfs_open(struct vop_open_args *ap) 1253 { 1254 struct thread *td = ap->a_td; 1255 struct vnode *vp = ap->a_vp; 1256 struct cdev *dev = vp->v_rdev; 1257 struct file *fp = ap->a_fp; 1258 int error, ref, vlocked; 1259 struct cdevsw *dsw; 1260 struct file *fpop; 1261 1262 if (vp->v_type == VBLK) 1263 return (ENXIO); 1264 1265 if (dev == NULL) 1266 return (ENXIO); 1267 1268 /* Make this field valid before any I/O in d_open. */ 1269 if (dev->si_iosize_max == 0) 1270 dev->si_iosize_max = DFLTPHYS; 1271 1272 dsw = dev_refthread(dev, &ref); 1273 if (dsw == NULL) 1274 return (ENXIO); 1275 if (fp == NULL && dsw->d_fdopen != NULL) { 1276 dev_relthread(dev, ref); 1277 return (ENXIO); 1278 } 1279 1280 if (vp->v_type == VCHR) 1281 devfs_usecount_add(vp); 1282 1283 vlocked = VOP_ISLOCKED(vp); 1284 VOP_UNLOCK(vp); 1285 1286 fpop = td->td_fpop; 1287 td->td_fpop = fp; 1288 if (fp != NULL) { 1289 fp->f_data = dev; 1290 fp->f_vnode = vp; 1291 } 1292 if (dsw->d_fdopen != NULL) 1293 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 1294 else 1295 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 1296 /* Clean up any cdevpriv upon error. */ 1297 if (error != 0) 1298 devfs_clear_cdevpriv(); 1299 td->td_fpop = fpop; 1300 1301 vn_lock(vp, vlocked | LK_RETRY); 1302 if (error != 0 && vp->v_type == VCHR) 1303 devfs_usecount_sub(vp); 1304 1305 dev_relthread(dev, ref); 1306 if (error != 0) { 1307 if (error == ERESTART) 1308 error = EINTR; 1309 return (error); 1310 } 1311 1312 #if 0 /* /dev/console */ 1313 KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp")); 1314 #else 1315 if (fp == NULL) 1316 return (error); 1317 #endif 1318 if (fp->f_ops == &badfileops) 1319 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f); 1320 return (error); 1321 } 1322 1323 static int 1324 devfs_pathconf(struct vop_pathconf_args *ap) 1325 { 1326 1327 switch (ap->a_name) { 1328 case _PC_FILESIZEBITS: 1329 *ap->a_retval = 64; 1330 return (0); 1331 case _PC_NAME_MAX: 1332 *ap->a_retval = NAME_MAX; 1333 return (0); 1334 case _PC_LINK_MAX: 1335 *ap->a_retval = INT_MAX; 1336 return (0); 1337 case _PC_SYMLINK_MAX: 1338 *ap->a_retval = MAXPATHLEN; 1339 return (0); 1340 case _PC_MAX_CANON: 1341 if (ap->a_vp->v_vflag & VV_ISTTY) { 1342 *ap->a_retval = MAX_CANON; 1343 return (0); 1344 } 1345 return (EINVAL); 1346 case _PC_MAX_INPUT: 1347 if (ap->a_vp->v_vflag & VV_ISTTY) { 1348 *ap->a_retval = MAX_INPUT; 1349 return (0); 1350 } 1351 return (EINVAL); 1352 case _PC_VDISABLE: 1353 if (ap->a_vp->v_vflag & VV_ISTTY) { 1354 *ap->a_retval = _POSIX_VDISABLE; 1355 return (0); 1356 } 1357 return (EINVAL); 1358 case _PC_MAC_PRESENT: 1359 #ifdef MAC 1360 /* 1361 * If MAC is enabled, devfs automatically supports 1362 * trivial non-persistent label storage. 1363 */ 1364 *ap->a_retval = 1; 1365 #else 1366 *ap->a_retval = 0; 1367 #endif 1368 return (0); 1369 case _PC_CHOWN_RESTRICTED: 1370 *ap->a_retval = 1; 1371 return (0); 1372 default: 1373 return (vop_stdpathconf(ap)); 1374 } 1375 /* NOTREACHED */ 1376 } 1377 1378 /* ARGSUSED */ 1379 static int 1380 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 1381 { 1382 struct cdev *dev; 1383 struct cdevsw *dsw; 1384 int error, ref; 1385 struct file *fpop; 1386 1387 fpop = td->td_fpop; 1388 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1389 if (error != 0) { 1390 error = vnops.fo_poll(fp, events, cred, td); 1391 return (error); 1392 } 1393 error = dsw->d_poll(dev, events, td); 1394 td->td_fpop = fpop; 1395 dev_relthread(dev, ref); 1396 return(error); 1397 } 1398 1399 /* 1400 * Print out the contents of a special device vnode. 1401 */ 1402 static int 1403 devfs_print(struct vop_print_args *ap) 1404 { 1405 1406 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 1407 return (0); 1408 } 1409 1410 static int 1411 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, 1412 int flags, struct thread *td) 1413 { 1414 struct cdev *dev; 1415 int ioflag, error, ref; 1416 ssize_t resid; 1417 struct cdevsw *dsw; 1418 struct file *fpop; 1419 1420 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1421 return (EINVAL); 1422 fpop = td->td_fpop; 1423 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1424 if (error != 0) { 1425 error = vnops.fo_read(fp, uio, cred, flags, td); 1426 return (error); 1427 } 1428 resid = uio->uio_resid; 1429 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 1430 if (ioflag & O_DIRECT) 1431 ioflag |= IO_DIRECT; 1432 1433 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1434 error = dsw->d_read(dev, uio, ioflag); 1435 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 1436 devfs_timestamp(&dev->si_atime); 1437 td->td_fpop = fpop; 1438 dev_relthread(dev, ref); 1439 1440 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_R); 1441 return (error); 1442 } 1443 1444 static int 1445 devfs_readdir(struct vop_readdir_args *ap) 1446 { 1447 int error; 1448 struct uio *uio; 1449 struct dirent *dp; 1450 struct devfs_dirent *dd; 1451 struct devfs_dirent *de; 1452 struct devfs_mount *dmp; 1453 off_t off; 1454 int *tmp_ncookies = NULL; 1455 1456 if (ap->a_vp->v_type != VDIR) 1457 return (ENOTDIR); 1458 1459 uio = ap->a_uio; 1460 if (uio->uio_offset < 0) 1461 return (EINVAL); 1462 1463 /* 1464 * XXX: This is a temporary hack to get around this filesystem not 1465 * supporting cookies. We store the location of the ncookies pointer 1466 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 1467 * and set the number of cookies to 0. We then set the pointer to 1468 * NULL so that vfs_read_dirent doesn't try to call realloc() on 1469 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 1470 * pointer to its original location before returning to the caller. 1471 */ 1472 if (ap->a_ncookies != NULL) { 1473 tmp_ncookies = ap->a_ncookies; 1474 *ap->a_ncookies = 0; 1475 ap->a_ncookies = NULL; 1476 } 1477 1478 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1479 if (devfs_populate_vp(ap->a_vp) != 0) { 1480 if (tmp_ncookies != NULL) 1481 ap->a_ncookies = tmp_ncookies; 1482 return (EIO); 1483 } 1484 error = 0; 1485 de = ap->a_vp->v_data; 1486 off = 0; 1487 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 1488 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 1489 if (dd->de_flags & (DE_COVERED | DE_WHITEOUT)) 1490 continue; 1491 if (devfs_prison_check(dd, uio->uio_td)) 1492 continue; 1493 if (dd->de_dirent->d_type == DT_DIR) 1494 de = dd->de_dir; 1495 else 1496 de = dd; 1497 dp = dd->de_dirent; 1498 MPASS(dp->d_reclen == GENERIC_DIRSIZ(dp)); 1499 if (dp->d_reclen > uio->uio_resid) 1500 break; 1501 dp->d_fileno = de->de_inode; 1502 /* NOTE: d_off is the offset for the *next* entry. */ 1503 dp->d_off = off + dp->d_reclen; 1504 if (off >= uio->uio_offset) { 1505 error = vfs_read_dirent(ap, dp, off); 1506 if (error) 1507 break; 1508 } 1509 off += dp->d_reclen; 1510 } 1511 sx_xunlock(&dmp->dm_lock); 1512 uio->uio_offset = off; 1513 1514 /* 1515 * Restore ap->a_ncookies if it wasn't originally NULL in the first 1516 * place. 1517 */ 1518 if (tmp_ncookies != NULL) 1519 ap->a_ncookies = tmp_ncookies; 1520 1521 return (error); 1522 } 1523 1524 static int 1525 devfs_readlink(struct vop_readlink_args *ap) 1526 { 1527 struct devfs_dirent *de; 1528 1529 de = ap->a_vp->v_data; 1530 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 1531 } 1532 1533 static void 1534 devfs_reclaiml(struct vnode *vp) 1535 { 1536 struct devfs_dirent *de; 1537 1538 mtx_assert(&devfs_de_interlock, MA_OWNED); 1539 de = vp->v_data; 1540 if (de != NULL) { 1541 MPASS(de->de_usecount == 0); 1542 de->de_vnode = NULL; 1543 vp->v_data = NULL; 1544 } 1545 } 1546 1547 static int 1548 devfs_reclaim(struct vop_reclaim_args *ap) 1549 { 1550 struct vnode *vp; 1551 1552 vp = ap->a_vp; 1553 mtx_lock(&devfs_de_interlock); 1554 devfs_reclaiml(vp); 1555 mtx_unlock(&devfs_de_interlock); 1556 return (0); 1557 } 1558 1559 static int 1560 devfs_reclaim_vchr(struct vop_reclaim_args *ap) 1561 { 1562 struct vnode *vp; 1563 struct cdev *dev; 1564 1565 vp = ap->a_vp; 1566 MPASS(vp->v_type == VCHR); 1567 1568 mtx_lock(&devfs_de_interlock); 1569 VI_LOCK(vp); 1570 devfs_usecount_subl(vp); 1571 devfs_reclaiml(vp); 1572 mtx_unlock(&devfs_de_interlock); 1573 dev_lock(); 1574 dev = vp->v_rdev; 1575 vp->v_rdev = NULL; 1576 dev_unlock(); 1577 VI_UNLOCK(vp); 1578 if (dev != NULL) 1579 dev_rel(dev); 1580 return (0); 1581 } 1582 1583 static int 1584 devfs_remove(struct vop_remove_args *ap) 1585 { 1586 struct vnode *dvp = ap->a_dvp; 1587 struct vnode *vp = ap->a_vp; 1588 struct devfs_dirent *dd; 1589 struct devfs_dirent *de, *de_covered; 1590 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1591 1592 ASSERT_VOP_ELOCKED(dvp, "devfs_remove"); 1593 ASSERT_VOP_ELOCKED(vp, "devfs_remove"); 1594 1595 sx_xlock(&dmp->dm_lock); 1596 dd = ap->a_dvp->v_data; 1597 de = vp->v_data; 1598 if (de->de_cdp == NULL) { 1599 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1600 if (de->de_dirent->d_type == DT_LNK) { 1601 de_covered = devfs_find(dd, de->de_dirent->d_name, 1602 de->de_dirent->d_namlen, 0); 1603 if (de_covered != NULL) 1604 de_covered->de_flags &= ~DE_COVERED; 1605 } 1606 /* We need to unlock dvp because devfs_delete() may lock it. */ 1607 VOP_UNLOCK(vp); 1608 if (dvp != vp) 1609 VOP_UNLOCK(dvp); 1610 devfs_delete(dmp, de, 0); 1611 sx_xunlock(&dmp->dm_lock); 1612 if (dvp != vp) 1613 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1614 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1615 } else { 1616 de->de_flags |= DE_WHITEOUT; 1617 sx_xunlock(&dmp->dm_lock); 1618 } 1619 return (0); 1620 } 1621 1622 /* 1623 * Revoke is called on a tty when a terminal session ends. The vnode 1624 * is orphaned by setting v_op to deadfs so we need to let go of it 1625 * as well so that we create a new one next time around. 1626 * 1627 */ 1628 static int 1629 devfs_revoke(struct vop_revoke_args *ap) 1630 { 1631 struct vnode *vp = ap->a_vp, *vp2; 1632 struct cdev *dev; 1633 struct cdev_priv *cdp; 1634 struct devfs_dirent *de; 1635 enum vgetstate vs; 1636 u_int i; 1637 1638 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1639 1640 dev = vp->v_rdev; 1641 cdp = cdev2priv(dev); 1642 1643 dev_lock(); 1644 cdp->cdp_inuse++; 1645 dev_unlock(); 1646 1647 vhold(vp); 1648 vgone(vp); 1649 vdrop(vp); 1650 1651 VOP_UNLOCK(vp); 1652 loop: 1653 for (;;) { 1654 mtx_lock(&devfs_de_interlock); 1655 dev_lock(); 1656 vp2 = NULL; 1657 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1658 de = cdp->cdp_dirents[i]; 1659 if (de == NULL) 1660 continue; 1661 1662 vp2 = de->de_vnode; 1663 if (vp2 != NULL) { 1664 dev_unlock(); 1665 vs = vget_prep(vp2); 1666 mtx_unlock(&devfs_de_interlock); 1667 if (vget_finish(vp2, LK_EXCLUSIVE, vs) != 0) 1668 goto loop; 1669 vhold(vp2); 1670 vgone(vp2); 1671 vdrop(vp2); 1672 vput(vp2); 1673 break; 1674 } 1675 } 1676 if (vp2 != NULL) { 1677 continue; 1678 } 1679 dev_unlock(); 1680 mtx_unlock(&devfs_de_interlock); 1681 break; 1682 } 1683 dev_lock(); 1684 cdp->cdp_inuse--; 1685 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1686 KASSERT((cdp->cdp_flags & CDP_ON_ACTIVE_LIST) != 0, 1687 ("%s: cdp %p (%s) not on active list", 1688 __func__, cdp, dev->si_name)); 1689 cdp->cdp_flags &= ~CDP_ON_ACTIVE_LIST; 1690 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1691 dev_unlock(); 1692 dev_rel(&cdp->cdp_c); 1693 } else 1694 dev_unlock(); 1695 1696 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1697 return (0); 1698 } 1699 1700 static int 1701 devfs_rioctl(struct vop_ioctl_args *ap) 1702 { 1703 struct vnode *vp; 1704 struct devfs_mount *dmp; 1705 int error; 1706 1707 vp = ap->a_vp; 1708 vn_lock(vp, LK_SHARED | LK_RETRY); 1709 if (VN_IS_DOOMED(vp)) { 1710 VOP_UNLOCK(vp); 1711 return (EBADF); 1712 } 1713 dmp = VFSTODEVFS(vp->v_mount); 1714 sx_xlock(&dmp->dm_lock); 1715 VOP_UNLOCK(vp); 1716 DEVFS_DMP_HOLD(dmp); 1717 devfs_populate(dmp); 1718 if (DEVFS_DMP_DROP(dmp)) { 1719 sx_xunlock(&dmp->dm_lock); 1720 devfs_unmount_final(dmp); 1721 return (ENOENT); 1722 } 1723 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1724 sx_xunlock(&dmp->dm_lock); 1725 return (error); 1726 } 1727 1728 static int 1729 devfs_rread(struct vop_read_args *ap) 1730 { 1731 1732 if (ap->a_vp->v_type != VDIR) 1733 return (EINVAL); 1734 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1735 } 1736 1737 static int 1738 devfs_setattr(struct vop_setattr_args *ap) 1739 { 1740 struct devfs_dirent *de; 1741 struct vattr *vap; 1742 struct vnode *vp; 1743 struct thread *td; 1744 int c, error; 1745 uid_t uid; 1746 gid_t gid; 1747 1748 vap = ap->a_vap; 1749 vp = ap->a_vp; 1750 td = curthread; 1751 if ((vap->va_type != VNON) || 1752 (vap->va_nlink != VNOVAL) || 1753 (vap->va_fsid != VNOVAL) || 1754 (vap->va_fileid != VNOVAL) || 1755 (vap->va_blocksize != VNOVAL) || 1756 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1757 (vap->va_rdev != VNOVAL) || 1758 ((int)vap->va_bytes != VNOVAL) || 1759 (vap->va_gen != VNOVAL)) { 1760 return (EINVAL); 1761 } 1762 1763 error = devfs_populate_vp(vp); 1764 if (error != 0) 1765 return (error); 1766 1767 de = vp->v_data; 1768 if (vp->v_type == VDIR) 1769 de = de->de_dir; 1770 1771 c = 0; 1772 if (vap->va_uid == (uid_t)VNOVAL) 1773 uid = de->de_uid; 1774 else 1775 uid = vap->va_uid; 1776 if (vap->va_gid == (gid_t)VNOVAL) 1777 gid = de->de_gid; 1778 else 1779 gid = vap->va_gid; 1780 if (uid != de->de_uid || gid != de->de_gid) { 1781 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1782 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1783 error = priv_check(td, PRIV_VFS_CHOWN); 1784 if (error != 0) 1785 goto ret; 1786 } 1787 de->de_uid = uid; 1788 de->de_gid = gid; 1789 c = 1; 1790 } 1791 1792 if (vap->va_mode != (mode_t)VNOVAL) { 1793 if (ap->a_cred->cr_uid != de->de_uid) { 1794 error = priv_check(td, PRIV_VFS_ADMIN); 1795 if (error != 0) 1796 goto ret; 1797 } 1798 de->de_mode = vap->va_mode; 1799 c = 1; 1800 } 1801 1802 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1803 error = vn_utimes_perm(vp, vap, ap->a_cred, td); 1804 if (error != 0) 1805 goto ret; 1806 if (vap->va_atime.tv_sec != VNOVAL) { 1807 if (vp->v_type == VCHR) 1808 vp->v_rdev->si_atime = vap->va_atime; 1809 else 1810 de->de_atime = vap->va_atime; 1811 } 1812 if (vap->va_mtime.tv_sec != VNOVAL) { 1813 if (vp->v_type == VCHR) 1814 vp->v_rdev->si_mtime = vap->va_mtime; 1815 else 1816 de->de_mtime = vap->va_mtime; 1817 } 1818 c = 1; 1819 } 1820 1821 if (c) { 1822 if (vp->v_type == VCHR) 1823 vfs_timestamp(&vp->v_rdev->si_ctime); 1824 else 1825 vfs_timestamp(&de->de_mtime); 1826 } 1827 1828 ret: 1829 sx_xunlock(&VFSTODEVFS(vp->v_mount)->dm_lock); 1830 return (error); 1831 } 1832 1833 #ifdef MAC 1834 static int 1835 devfs_setlabel(struct vop_setlabel_args *ap) 1836 { 1837 struct vnode *vp; 1838 struct devfs_dirent *de; 1839 1840 vp = ap->a_vp; 1841 de = vp->v_data; 1842 1843 mac_vnode_relabel(ap->a_cred, vp, ap->a_label); 1844 mac_devfs_update(vp->v_mount, de, vp); 1845 1846 return (0); 1847 } 1848 #endif 1849 1850 static int 1851 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred) 1852 { 1853 1854 return (vnops.fo_stat(fp, sb, cred)); 1855 } 1856 1857 static int 1858 devfs_symlink(struct vop_symlink_args *ap) 1859 { 1860 int i, error; 1861 struct devfs_dirent *dd; 1862 struct devfs_dirent *de, *de_covered, *de_dotdot; 1863 struct devfs_mount *dmp; 1864 1865 error = priv_check(curthread, PRIV_DEVFS_SYMLINK); 1866 if (error) 1867 return(error); 1868 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1869 if (devfs_populate_vp(ap->a_dvp) != 0) 1870 return (ENOENT); 1871 1872 dd = ap->a_dvp->v_data; 1873 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1874 de->de_flags = DE_USER; 1875 de->de_uid = 0; 1876 de->de_gid = 0; 1877 de->de_mode = 0755; 1878 de->de_inode = alloc_unr(devfs_inos); 1879 de->de_dir = dd; 1880 de->de_dirent->d_type = DT_LNK; 1881 i = strlen(ap->a_target) + 1; 1882 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1883 bcopy(ap->a_target, de->de_symlink, i); 1884 #ifdef MAC 1885 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1886 #endif 1887 de_covered = devfs_find(dd, de->de_dirent->d_name, 1888 de->de_dirent->d_namlen, 0); 1889 if (de_covered != NULL) { 1890 if ((de_covered->de_flags & DE_USER) != 0) { 1891 devfs_delete(dmp, de, DEVFS_DEL_NORECURSE); 1892 sx_xunlock(&dmp->dm_lock); 1893 return (EEXIST); 1894 } 1895 KASSERT((de_covered->de_flags & DE_COVERED) == 0, 1896 ("devfs_symlink: entry %p already covered", de_covered)); 1897 de_covered->de_flags |= DE_COVERED; 1898 } 1899 1900 de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */ 1901 de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */ 1902 TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list); 1903 devfs_dir_ref_de(dmp, dd); 1904 devfs_rules_apply(dmp, de); 1905 1906 return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp)); 1907 } 1908 1909 static int 1910 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) 1911 { 1912 1913 return (vnops.fo_truncate(fp, length, cred, td)); 1914 } 1915 1916 static int 1917 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, 1918 int flags, struct thread *td) 1919 { 1920 struct cdev *dev; 1921 int error, ioflag, ref; 1922 ssize_t resid; 1923 struct cdevsw *dsw; 1924 struct file *fpop; 1925 1926 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1927 return (EINVAL); 1928 fpop = td->td_fpop; 1929 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1930 if (error != 0) { 1931 error = vnops.fo_write(fp, uio, cred, flags, td); 1932 return (error); 1933 } 1934 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1935 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1936 if (ioflag & O_DIRECT) 1937 ioflag |= IO_DIRECT; 1938 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1939 1940 resid = uio->uio_resid; 1941 1942 error = dsw->d_write(dev, uio, ioflag); 1943 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1944 devfs_timestamp(&dev->si_ctime); 1945 dev->si_mtime = dev->si_ctime; 1946 } 1947 td->td_fpop = fpop; 1948 dev_relthread(dev, ref); 1949 1950 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_W); 1951 return (error); 1952 } 1953 1954 static int 1955 devfs_mmap_f(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size, 1956 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff, 1957 struct thread *td) 1958 { 1959 struct cdev *dev; 1960 struct cdevsw *dsw; 1961 struct mount *mp; 1962 struct vnode *vp; 1963 struct file *fpop; 1964 vm_object_t object; 1965 vm_prot_t maxprot; 1966 int error, ref; 1967 1968 vp = fp->f_vnode; 1969 1970 /* 1971 * Ensure that file and memory protections are 1972 * compatible. 1973 */ 1974 mp = vp->v_mount; 1975 if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0) { 1976 maxprot = VM_PROT_NONE; 1977 if ((prot & VM_PROT_EXECUTE) != 0) 1978 return (EACCES); 1979 } else 1980 maxprot = VM_PROT_EXECUTE; 1981 if ((fp->f_flag & FREAD) != 0) 1982 maxprot |= VM_PROT_READ; 1983 else if ((prot & VM_PROT_READ) != 0) 1984 return (EACCES); 1985 1986 /* 1987 * If we are sharing potential changes via MAP_SHARED and we 1988 * are trying to get write permission although we opened it 1989 * without asking for it, bail out. 1990 * 1991 * Note that most character devices always share mappings. 1992 * The one exception is that D_MMAP_ANON devices 1993 * (i.e. /dev/zero) permit private writable mappings. 1994 * 1995 * Rely on vm_mmap_cdev() to fail invalid MAP_PRIVATE requests 1996 * as well as updating maxprot to permit writing for 1997 * D_MMAP_ANON devices rather than doing that here. 1998 */ 1999 if ((flags & MAP_SHARED) != 0) { 2000 if ((fp->f_flag & FWRITE) != 0) 2001 maxprot |= VM_PROT_WRITE; 2002 else if ((prot & VM_PROT_WRITE) != 0) 2003 return (EACCES); 2004 } 2005 maxprot &= cap_maxprot; 2006 2007 fpop = td->td_fpop; 2008 error = devfs_fp_check(fp, &dev, &dsw, &ref); 2009 if (error != 0) 2010 return (error); 2011 2012 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, dev, dsw, &foff, 2013 &object); 2014 td->td_fpop = fpop; 2015 dev_relthread(dev, ref); 2016 if (error != 0) 2017 return (error); 2018 2019 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object, 2020 foff, FALSE, td); 2021 if (error != 0) 2022 vm_object_deallocate(object); 2023 return (error); 2024 } 2025 2026 dev_t 2027 dev2udev(struct cdev *x) 2028 { 2029 if (x == NULL) 2030 return (NODEV); 2031 return (cdev2priv(x)->cdp_inode); 2032 } 2033 2034 static int 2035 devfs_cmp_f(struct file *fp1, struct file *fp2, struct thread *td) 2036 { 2037 if (fp2->f_type != DTYPE_VNODE || fp2->f_ops != &devfs_ops_f) 2038 return (3); 2039 return (kcmp_cmp((uintptr_t)fp1->f_data, (uintptr_t)fp2->f_data)); 2040 } 2041 2042 static struct fileops devfs_ops_f = { 2043 .fo_read = devfs_read_f, 2044 .fo_write = devfs_write_f, 2045 .fo_truncate = devfs_truncate_f, 2046 .fo_ioctl = devfs_ioctl_f, 2047 .fo_poll = devfs_poll_f, 2048 .fo_kqfilter = devfs_kqfilter_f, 2049 .fo_stat = devfs_stat_f, 2050 .fo_close = devfs_close_f, 2051 .fo_chmod = vn_chmod, 2052 .fo_chown = vn_chown, 2053 .fo_sendfile = vn_sendfile, 2054 .fo_seek = vn_seek, 2055 .fo_fill_kinfo = vn_fill_kinfo, 2056 .fo_mmap = devfs_mmap_f, 2057 .fo_cmp = devfs_cmp_f, 2058 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 2059 }; 2060 2061 /* Vops for non-CHR vnodes in /dev. */ 2062 static struct vop_vector devfs_vnodeops = { 2063 .vop_default = &default_vnodeops, 2064 2065 .vop_access = devfs_access, 2066 .vop_getattr = devfs_getattr, 2067 .vop_ioctl = devfs_rioctl, 2068 .vop_lookup = devfs_lookup, 2069 .vop_mknod = devfs_mknod, 2070 .vop_pathconf = devfs_pathconf, 2071 .vop_read = devfs_rread, 2072 .vop_readdir = devfs_readdir, 2073 .vop_readlink = devfs_readlink, 2074 .vop_reclaim = devfs_reclaim, 2075 .vop_remove = devfs_remove, 2076 .vop_revoke = devfs_revoke, 2077 .vop_setattr = devfs_setattr, 2078 #ifdef MAC 2079 .vop_setlabel = devfs_setlabel, 2080 #endif 2081 .vop_symlink = devfs_symlink, 2082 .vop_vptocnp = devfs_vptocnp, 2083 .vop_lock1 = vop_lock, 2084 .vop_unlock = vop_unlock, 2085 .vop_islocked = vop_islocked, 2086 .vop_add_writecount = vop_stdadd_writecount_nomsync, 2087 }; 2088 VFS_VOP_VECTOR_REGISTER(devfs_vnodeops); 2089 2090 /* Vops for VCHR vnodes in /dev. */ 2091 static struct vop_vector devfs_specops = { 2092 .vop_default = &default_vnodeops, 2093 2094 .vop_access = devfs_access, 2095 .vop_bmap = VOP_PANIC, 2096 .vop_close = devfs_close, 2097 .vop_create = VOP_PANIC, 2098 .vop_fsync = vop_stdfsync, 2099 .vop_getattr = devfs_getattr, 2100 .vop_ioctl = devfs_ioctl, 2101 .vop_link = VOP_PANIC, 2102 .vop_mkdir = VOP_PANIC, 2103 .vop_mknod = VOP_PANIC, 2104 .vop_open = devfs_open, 2105 .vop_pathconf = devfs_pathconf, 2106 .vop_poll = dead_poll, 2107 .vop_print = devfs_print, 2108 .vop_read = dead_read, 2109 .vop_readdir = VOP_PANIC, 2110 .vop_readlink = VOP_PANIC, 2111 .vop_reallocblks = VOP_PANIC, 2112 .vop_reclaim = devfs_reclaim_vchr, 2113 .vop_remove = devfs_remove, 2114 .vop_rename = VOP_PANIC, 2115 .vop_revoke = devfs_revoke, 2116 .vop_rmdir = VOP_PANIC, 2117 .vop_setattr = devfs_setattr, 2118 #ifdef MAC 2119 .vop_setlabel = devfs_setlabel, 2120 #endif 2121 .vop_strategy = VOP_PANIC, 2122 .vop_symlink = VOP_PANIC, 2123 .vop_vptocnp = devfs_vptocnp, 2124 .vop_write = dead_write, 2125 .vop_lock1 = vop_lock, 2126 .vop_unlock = vop_unlock, 2127 .vop_islocked = vop_islocked, 2128 .vop_add_writecount = vop_stdadd_writecount_nomsync, 2129 }; 2130 VFS_VOP_VECTOR_REGISTER(devfs_specops); 2131 2132 /* 2133 * Our calling convention to the device drivers used to be that we passed 2134 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 2135 * flags instead since that's what open(), close() and ioctl() takes and 2136 * we don't really want vnode.h in device drivers. 2137 * We solved the source compatibility by redefining some vnode flags to 2138 * be the same as the fcntl ones and by sending down the bitwise OR of 2139 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 2140 * pulls the rug out under this. 2141 */ 2142 CTASSERT(O_NONBLOCK == IO_NDELAY); 2143 CTASSERT(O_FSYNC == IO_SYNC); 2144