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 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43 33 */ 34 35 /* 36 * TODO: 37 * mkdir: want it ? 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/conf.h> 43 #include <sys/dirent.h> 44 #include <sys/eventhandler.h> 45 #include <sys/fcntl.h> 46 #include <sys/file.h> 47 #include <sys/filedesc.h> 48 #include <sys/filio.h> 49 #include <sys/jail.h> 50 #include <sys/kernel.h> 51 #include <sys/limits.h> 52 #include <sys/lock.h> 53 #include <sys/malloc.h> 54 #include <sys/mman.h> 55 #include <sys/mount.h> 56 #include <sys/namei.h> 57 #include <sys/priv.h> 58 #include <sys/proc.h> 59 #include <sys/stat.h> 60 #include <sys/sx.h> 61 #include <sys/sysctl.h> 62 #include <sys/time.h> 63 #include <sys/ttycom.h> 64 #include <sys/unistd.h> 65 #include <sys/vnode.h> 66 67 static struct vop_vector devfs_vnodeops; 68 static struct vop_vector devfs_specops; 69 static const struct fileops devfs_ops_f; 70 71 #include <fs/devfs/devfs.h> 72 #include <fs/devfs/devfs_int.h> 73 74 #include <security/mac/mac_framework.h> 75 76 #include <vm/vm.h> 77 #include <vm/vm_extern.h> 78 #include <vm/vm_object.h> 79 80 static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data"); 81 82 struct mtx devfs_de_interlock; 83 MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF); 84 struct mtx cdevpriv_mtx; 85 MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF); 86 87 SYSCTL_DECL(_vfs_devfs); 88 89 static int devfs_dotimes; 90 SYSCTL_INT(_vfs_devfs, OID_AUTO, dotimes, CTLFLAG_RW, 91 &devfs_dotimes, 0, "Update timestamps on DEVFS with default precision"); 92 93 /* 94 * Update devfs node timestamp. Note that updates are unlocked and 95 * stat(2) could see partially updated times. 96 */ 97 static void 98 devfs_timestamp(struct timespec *tsp) 99 { 100 time_t ts; 101 102 if (devfs_dotimes) { 103 vfs_timestamp(tsp); 104 } else { 105 ts = time_second; 106 if (tsp->tv_sec != ts) { 107 tsp->tv_sec = ts; 108 tsp->tv_nsec = 0; 109 } 110 } 111 } 112 113 static int 114 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp, 115 int *ref) 116 { 117 *dswp = devvn_refthread(fp->f_vnode, devp, ref); 118 if (*dswp == NULL || *devp != fp->f_data) { 119 if (*dswp != NULL) 120 dev_relthread(*devp, *ref); 121 return (ENXIO); 122 } 123 KASSERT((*devp)->si_refcount > 0, 124 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp))); 125 if (*dswp == NULL) 126 return (ENXIO); 127 curthread->td_fpop = fp; 128 return (0); 129 } 130 131 int 132 devfs_get_cdevpriv(void **datap) 133 { 134 struct file *fp; 135 struct cdev_privdata *p; 136 int error; 137 138 fp = curthread->td_fpop; 139 if (fp == NULL) 140 return (EBADF); 141 p = fp->f_cdevpriv; 142 if (p != NULL) { 143 error = 0; 144 *datap = p->cdpd_data; 145 } else 146 error = ENOENT; 147 return (error); 148 } 149 150 int 151 devfs_set_cdevpriv(void *priv, d_priv_dtor_t *priv_dtr) 152 { 153 struct file *fp; 154 struct cdev_priv *cdp; 155 struct cdev_privdata *p; 156 int error; 157 158 fp = curthread->td_fpop; 159 if (fp == NULL) 160 return (ENOENT); 161 cdp = cdev2priv((struct cdev *)fp->f_data); 162 p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK); 163 p->cdpd_data = priv; 164 p->cdpd_dtr = priv_dtr; 165 p->cdpd_fp = fp; 166 mtx_lock(&cdevpriv_mtx); 167 if (fp->f_cdevpriv == NULL) { 168 LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list); 169 fp->f_cdevpriv = p; 170 mtx_unlock(&cdevpriv_mtx); 171 error = 0; 172 } else { 173 mtx_unlock(&cdevpriv_mtx); 174 free(p, M_CDEVPDATA); 175 error = EBUSY; 176 } 177 return (error); 178 } 179 180 int 181 devfs_foreach_cdevpriv(struct cdev *dev, int (*cb)(void *data, void *arg), 182 void *arg) 183 { 184 struct cdev_priv *cdp; 185 struct cdev_privdata *p; 186 int error; 187 188 cdp = cdev2priv(dev); 189 error = 0; 190 mtx_lock(&cdevpriv_mtx); 191 LIST_FOREACH(p, &cdp->cdp_fdpriv, cdpd_list) { 192 error = cb(p->cdpd_data, arg); 193 if (error != 0) 194 break; 195 } 196 mtx_unlock(&cdevpriv_mtx); 197 return (error); 198 } 199 200 void 201 devfs_destroy_cdevpriv(struct cdev_privdata *p) 202 { 203 struct file *fp; 204 struct cdev_priv *cdp; 205 206 mtx_assert(&cdevpriv_mtx, MA_OWNED); 207 fp = p->cdpd_fp; 208 KASSERT(fp->f_cdevpriv == p, 209 ("devfs_destoy_cdevpriv %p != %p", fp->f_cdevpriv, p)); 210 cdp = cdev2priv((struct cdev *)fp->f_data); 211 cdp->cdp_fdpriv_dtrc++; 212 fp->f_cdevpriv = NULL; 213 LIST_REMOVE(p, cdpd_list); 214 mtx_unlock(&cdevpriv_mtx); 215 (p->cdpd_dtr)(p->cdpd_data); 216 mtx_lock(&cdevpriv_mtx); 217 MPASS(cdp->cdp_fdpriv_dtrc >= 1); 218 cdp->cdp_fdpriv_dtrc--; 219 if (cdp->cdp_fdpriv_dtrc == 0) 220 wakeup(&cdp->cdp_fdpriv_dtrc); 221 mtx_unlock(&cdevpriv_mtx); 222 free(p, M_CDEVPDATA); 223 } 224 225 static void 226 devfs_fpdrop(struct file *fp) 227 { 228 struct cdev_privdata *p; 229 230 mtx_lock(&cdevpriv_mtx); 231 if ((p = fp->f_cdevpriv) == NULL) { 232 mtx_unlock(&cdevpriv_mtx); 233 return; 234 } 235 devfs_destroy_cdevpriv(p); 236 } 237 238 void 239 devfs_clear_cdevpriv(void) 240 { 241 struct file *fp; 242 243 fp = curthread->td_fpop; 244 if (fp == NULL) 245 return; 246 devfs_fpdrop(fp); 247 } 248 249 static void 250 devfs_usecount_add(struct vnode *vp) 251 { 252 struct devfs_dirent *de; 253 struct cdev *dev; 254 255 mtx_lock(&devfs_de_interlock); 256 VI_LOCK(vp); 257 VNPASS(vp->v_type == VCHR || vp->v_type == VBAD, vp); 258 if (VN_IS_DOOMED(vp)) { 259 goto out_unlock; 260 } 261 262 de = vp->v_data; 263 dev = vp->v_rdev; 264 MPASS(de != NULL); 265 MPASS(dev != NULL); 266 dev->si_usecount++; 267 de->de_usecount++; 268 out_unlock: 269 VI_UNLOCK(vp); 270 mtx_unlock(&devfs_de_interlock); 271 } 272 273 static void 274 devfs_usecount_subl(struct vnode *vp) 275 { 276 struct devfs_dirent *de; 277 struct cdev *dev; 278 279 mtx_assert(&devfs_de_interlock, MA_OWNED); 280 ASSERT_VI_LOCKED(vp, __func__); 281 VNPASS(vp->v_type == VCHR || vp->v_type == VBAD, vp); 282 283 de = vp->v_data; 284 dev = vp->v_rdev; 285 if (de == NULL) 286 return; 287 if (dev == NULL) { 288 MPASS(de->de_usecount == 0); 289 return; 290 } 291 if (dev->si_usecount < de->de_usecount) 292 panic("%s: si_usecount underflow for dev %p " 293 "(has %ld, dirent has %d)\n", 294 __func__, dev, dev->si_usecount, de->de_usecount); 295 if (VN_IS_DOOMED(vp)) { 296 dev->si_usecount -= de->de_usecount; 297 de->de_usecount = 0; 298 } else { 299 if (de->de_usecount == 0) 300 panic("%s: de_usecount underflow for dev %p\n", 301 __func__, dev); 302 dev->si_usecount--; 303 de->de_usecount--; 304 } 305 } 306 307 static void 308 devfs_usecount_sub(struct vnode *vp) 309 { 310 311 mtx_lock(&devfs_de_interlock); 312 VI_LOCK(vp); 313 devfs_usecount_subl(vp); 314 VI_UNLOCK(vp); 315 mtx_unlock(&devfs_de_interlock); 316 } 317 318 static int 319 devfs_usecountl(struct vnode *vp) 320 { 321 322 VNPASS(vp->v_type == VCHR, vp); 323 mtx_assert(&devfs_de_interlock, MA_OWNED); 324 ASSERT_VI_LOCKED(vp, __func__); 325 return (vp->v_rdev->si_usecount); 326 } 327 328 int 329 devfs_usecount(struct vnode *vp) 330 { 331 int count; 332 333 VNPASS(vp->v_type == VCHR, vp); 334 mtx_lock(&devfs_de_interlock); 335 VI_LOCK(vp); 336 count = devfs_usecountl(vp); 337 VI_UNLOCK(vp); 338 mtx_unlock(&devfs_de_interlock); 339 return (count); 340 } 341 342 void 343 devfs_ctty_ref(struct vnode *vp) 344 { 345 346 vrefact(vp); 347 devfs_usecount_add(vp); 348 } 349 350 void 351 devfs_ctty_unref(struct vnode *vp) 352 { 353 354 devfs_usecount_sub(vp); 355 vrele(vp); 356 } 357 358 /* 359 * On success devfs_populate_vp() returns with dmp->dm_lock held. 360 */ 361 static int 362 devfs_populate_vp(struct vnode *vp) 363 { 364 struct devfs_dirent *de; 365 struct devfs_mount *dmp; 366 int locked; 367 368 ASSERT_VOP_LOCKED(vp, "devfs_populate_vp"); 369 370 dmp = VFSTODEVFS(vp->v_mount); 371 if (!devfs_populate_needed(dmp)) { 372 sx_xlock(&dmp->dm_lock); 373 goto out_nopopulate; 374 } 375 376 locked = VOP_ISLOCKED(vp); 377 378 sx_xlock(&dmp->dm_lock); 379 DEVFS_DMP_HOLD(dmp); 380 381 /* Can't call devfs_populate() with the vnode lock held. */ 382 VOP_UNLOCK(vp); 383 devfs_populate(dmp); 384 385 sx_xunlock(&dmp->dm_lock); 386 vn_lock(vp, locked | LK_RETRY); 387 sx_xlock(&dmp->dm_lock); 388 if (DEVFS_DMP_DROP(dmp)) { 389 sx_xunlock(&dmp->dm_lock); 390 devfs_unmount_final(dmp); 391 return (ERESTART); 392 } 393 out_nopopulate: 394 if (VN_IS_DOOMED(vp)) { 395 sx_xunlock(&dmp->dm_lock); 396 return (ERESTART); 397 } 398 de = vp->v_data; 399 KASSERT(de != NULL, 400 ("devfs_populate_vp: vp->v_data == NULL but vnode not doomed")); 401 if ((de->de_flags & DE_DOOMED) != 0) { 402 sx_xunlock(&dmp->dm_lock); 403 return (ERESTART); 404 } 405 406 return (0); 407 } 408 409 static int 410 devfs_vptocnp(struct vop_vptocnp_args *ap) 411 { 412 struct vnode *vp = ap->a_vp; 413 struct vnode **dvp = ap->a_vpp; 414 struct devfs_mount *dmp; 415 char *buf = ap->a_buf; 416 size_t *buflen = ap->a_buflen; 417 struct devfs_dirent *dd, *de; 418 int i, error; 419 420 dmp = VFSTODEVFS(vp->v_mount); 421 422 error = devfs_populate_vp(vp); 423 if (error != 0) 424 return (error); 425 426 if (vp->v_type != VCHR && vp->v_type != VDIR) { 427 error = ENOENT; 428 goto finished; 429 } 430 431 dd = vp->v_data; 432 if (vp->v_type == VDIR && dd == dmp->dm_rootdir) { 433 *dvp = vp; 434 vref(*dvp); 435 goto finished; 436 } 437 438 i = *buflen; 439 i -= dd->de_dirent->d_namlen; 440 if (i < 0) { 441 error = ENOMEM; 442 goto finished; 443 } 444 bcopy(dd->de_dirent->d_name, buf + i, dd->de_dirent->d_namlen); 445 *buflen = i; 446 de = devfs_parent_dirent(dd); 447 if (de == NULL) { 448 error = ENOENT; 449 goto finished; 450 } 451 mtx_lock(&devfs_de_interlock); 452 *dvp = de->de_vnode; 453 if (*dvp != NULL) { 454 VI_LOCK(*dvp); 455 mtx_unlock(&devfs_de_interlock); 456 vholdl(*dvp); 457 VI_UNLOCK(*dvp); 458 vref(*dvp); 459 vdrop(*dvp); 460 } else { 461 mtx_unlock(&devfs_de_interlock); 462 error = ENOENT; 463 } 464 finished: 465 sx_xunlock(&dmp->dm_lock); 466 return (error); 467 } 468 469 /* 470 * Construct the fully qualified path name relative to the mountpoint. 471 * If a NULL cnp is provided, no '/' is appended to the resulting path. 472 */ 473 char * 474 devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd, 475 struct componentname *cnp) 476 { 477 int i; 478 struct devfs_dirent *de; 479 480 sx_assert(&dmp->dm_lock, SA_LOCKED); 481 482 i = SPECNAMELEN; 483 buf[i] = '\0'; 484 if (cnp != NULL) 485 i -= cnp->cn_namelen; 486 if (i < 0) 487 return (NULL); 488 if (cnp != NULL) 489 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); 490 de = dd; 491 while (de != dmp->dm_rootdir) { 492 if (cnp != NULL || i < SPECNAMELEN) { 493 i--; 494 if (i < 0) 495 return (NULL); 496 buf[i] = '/'; 497 } 498 i -= de->de_dirent->d_namlen; 499 if (i < 0) 500 return (NULL); 501 bcopy(de->de_dirent->d_name, buf + i, 502 de->de_dirent->d_namlen); 503 de = devfs_parent_dirent(de); 504 if (de == NULL) 505 return (NULL); 506 } 507 return (buf + i); 508 } 509 510 static int 511 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp, 512 struct devfs_dirent *de) 513 { 514 int not_found; 515 516 not_found = 0; 517 if (de->de_flags & DE_DOOMED) 518 not_found = 1; 519 if (DEVFS_DE_DROP(de)) { 520 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed")); 521 devfs_dirent_free(de); 522 } 523 if (DEVFS_DMP_DROP(dmp)) { 524 KASSERT(not_found == 1, 525 ("DEVFS mount struct freed before dirent")); 526 not_found = 2; 527 sx_xunlock(&dmp->dm_lock); 528 devfs_unmount_final(dmp); 529 } 530 if (not_found == 1 || (drop_dm_lock && not_found != 2)) 531 sx_unlock(&dmp->dm_lock); 532 return (not_found); 533 } 534 535 /* 536 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops 537 * it on return. 538 */ 539 int 540 devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode, 541 struct vnode **vpp) 542 { 543 int error; 544 struct vnode *vp; 545 struct cdev *dev; 546 struct devfs_mount *dmp; 547 struct cdevsw *dsw; 548 enum vgetstate vs; 549 550 dmp = VFSTODEVFS(mp); 551 if (de->de_flags & DE_DOOMED) { 552 sx_xunlock(&dmp->dm_lock); 553 return (ENOENT); 554 } 555 loop: 556 DEVFS_DE_HOLD(de); 557 DEVFS_DMP_HOLD(dmp); 558 mtx_lock(&devfs_de_interlock); 559 vp = de->de_vnode; 560 if (vp != NULL) { 561 vs = vget_prep(vp); 562 mtx_unlock(&devfs_de_interlock); 563 sx_xunlock(&dmp->dm_lock); 564 vget_finish(vp, lockmode | LK_RETRY, vs); 565 sx_xlock(&dmp->dm_lock); 566 if (devfs_allocv_drop_refs(0, dmp, de)) { 567 vput(vp); 568 return (ENOENT); 569 } else if (VN_IS_DOOMED(vp)) { 570 mtx_lock(&devfs_de_interlock); 571 if (de->de_vnode == vp) { 572 de->de_vnode = NULL; 573 vp->v_data = NULL; 574 } 575 mtx_unlock(&devfs_de_interlock); 576 vput(vp); 577 goto loop; 578 } 579 sx_xunlock(&dmp->dm_lock); 580 *vpp = vp; 581 return (0); 582 } 583 mtx_unlock(&devfs_de_interlock); 584 if (de->de_dirent->d_type == DT_CHR) { 585 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { 586 devfs_allocv_drop_refs(1, dmp, de); 587 return (ENOENT); 588 } 589 dev = &de->de_cdp->cdp_c; 590 } else { 591 dev = NULL; 592 } 593 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 594 if (error != 0) { 595 devfs_allocv_drop_refs(1, dmp, de); 596 printf("devfs_allocv: failed to allocate new vnode\n"); 597 return (error); 598 } 599 600 if (de->de_dirent->d_type == DT_CHR) { 601 vp->v_type = VCHR; 602 VI_LOCK(vp); 603 dev_lock(); 604 dev_refl(dev); 605 /* XXX: v_rdev should be protect by vnode lock */ 606 vp->v_rdev = dev; 607 VNPASS(vp->v_usecount == 1, vp); 608 /* Special casing of ttys for deadfs. Probably redundant. */ 609 dsw = dev->si_devsw; 610 if (dsw != NULL && (dsw->d_flags & D_TTY) != 0) 611 vp->v_vflag |= VV_ISTTY; 612 dev_unlock(); 613 VI_UNLOCK(vp); 614 if ((dev->si_flags & SI_ETERNAL) != 0) 615 vp->v_vflag |= VV_ETERNALDEV; 616 vp->v_op = &devfs_specops; 617 } else if (de->de_dirent->d_type == DT_DIR) { 618 vp->v_type = VDIR; 619 } else if (de->de_dirent->d_type == DT_LNK) { 620 vp->v_type = VLNK; 621 } else { 622 vp->v_type = VBAD; 623 } 624 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS); 625 VN_LOCK_ASHARE(vp); 626 mtx_lock(&devfs_de_interlock); 627 vp->v_data = de; 628 de->de_vnode = vp; 629 mtx_unlock(&devfs_de_interlock); 630 error = insmntque1(vp, mp); 631 if (error != 0) { 632 mtx_lock(&devfs_de_interlock); 633 vp->v_data = NULL; 634 de->de_vnode = NULL; 635 mtx_unlock(&devfs_de_interlock); 636 vgone(vp); 637 vput(vp); 638 (void) devfs_allocv_drop_refs(1, dmp, de); 639 return (error); 640 } 641 if (devfs_allocv_drop_refs(0, dmp, de)) { 642 vgone(vp); 643 vput(vp); 644 return (ENOENT); 645 } 646 #ifdef MAC 647 mac_devfs_vnode_associate(mp, de, vp); 648 #endif 649 sx_xunlock(&dmp->dm_lock); 650 vn_set_state(vp, VSTATE_CONSTRUCTED); 651 *vpp = vp; 652 return (0); 653 } 654 655 static int 656 devfs_access(struct vop_access_args *ap) 657 { 658 struct vnode *vp = ap->a_vp; 659 struct devfs_dirent *de; 660 struct proc *p; 661 int error; 662 663 de = vp->v_data; 664 if (vp->v_type == VDIR) 665 de = de->de_dir; 666 667 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 668 ap->a_accmode, ap->a_cred); 669 if (error == 0) 670 return (0); 671 if (error != EACCES) 672 return (error); 673 p = ap->a_td->td_proc; 674 /* We do, however, allow access to the controlling terminal */ 675 PROC_LOCK(p); 676 if (!(p->p_flag & P_CONTROLT)) { 677 PROC_UNLOCK(p); 678 return (error); 679 } 680 if (p->p_session->s_ttydp == de->de_cdp) 681 error = 0; 682 PROC_UNLOCK(p); 683 return (error); 684 } 685 686 _Static_assert(((FMASK | FCNTLFLAGS) & (FLASTCLOSE | FREVOKE)) == 0, 687 "devfs-only flag reuse failed"); 688 689 static int 690 devfs_close(struct vop_close_args *ap) 691 { 692 struct vnode *vp = ap->a_vp, *oldvp; 693 struct thread *td = ap->a_td; 694 struct proc *p; 695 struct cdev *dev = vp->v_rdev; 696 struct cdevsw *dsw; 697 struct devfs_dirent *de = vp->v_data; 698 int dflags, error, ref, vp_locked; 699 700 /* 701 * XXX: Don't call d_close() if we were called because of 702 * XXX: insmntque() failure. 703 */ 704 if (vp->v_data == NULL) 705 return (0); 706 707 /* 708 * Hack: a tty device that is a controlling terminal 709 * has a reference from the session structure. 710 * We cannot easily tell that a character device is 711 * a controlling terminal, unless it is the closing 712 * process' controlling terminal. In that case, 713 * if the reference count is 2 (this last descriptor 714 * plus the session), release the reference from the session. 715 */ 716 if (de->de_usecount == 2 && td != NULL) { 717 p = td->td_proc; 718 PROC_LOCK(p); 719 if (vp == p->p_session->s_ttyvp) { 720 PROC_UNLOCK(p); 721 oldvp = NULL; 722 sx_xlock(&proctree_lock); 723 if (vp == p->p_session->s_ttyvp) { 724 SESS_LOCK(p->p_session); 725 mtx_lock(&devfs_de_interlock); 726 VI_LOCK(vp); 727 if (devfs_usecountl(vp) == 2 && !VN_IS_DOOMED(vp)) { 728 p->p_session->s_ttyvp = NULL; 729 p->p_session->s_ttydp = NULL; 730 oldvp = vp; 731 } 732 VI_UNLOCK(vp); 733 mtx_unlock(&devfs_de_interlock); 734 SESS_UNLOCK(p->p_session); 735 } 736 sx_xunlock(&proctree_lock); 737 if (oldvp != NULL) 738 devfs_ctty_unref(oldvp); 739 } else 740 PROC_UNLOCK(p); 741 } 742 /* 743 * We do not want to really close the device if it 744 * is still in use unless we are trying to close it 745 * forcibly. Since every use (buffer, vnode, swap, cmap) 746 * holds a reference to the vnode, and because we mark 747 * any other vnodes that alias this device, when the 748 * sum of the reference counts on all the aliased 749 * vnodes descends to one, we are on last close. 750 */ 751 dsw = dev_refthread(dev, &ref); 752 if (dsw == NULL) 753 return (ENXIO); 754 dflags = 0; 755 mtx_lock(&devfs_de_interlock); 756 VI_LOCK(vp); 757 if (devfs_usecountl(vp) == 1) 758 dflags |= FLASTCLOSE; 759 devfs_usecount_subl(vp); 760 mtx_unlock(&devfs_de_interlock); 761 if (VN_IS_DOOMED(vp)) { 762 /* Forced close. */ 763 dflags |= FREVOKE | FNONBLOCK; 764 } else if (dsw->d_flags & D_TRACKCLOSE) { 765 /* Keep device updated on status. */ 766 } else if ((dflags & FLASTCLOSE) == 0) { 767 VI_UNLOCK(vp); 768 dev_relthread(dev, ref); 769 return (0); 770 } 771 vholdnz(vp); 772 VI_UNLOCK(vp); 773 vp_locked = VOP_ISLOCKED(vp); 774 VOP_UNLOCK(vp); 775 KASSERT(dev->si_refcount > 0, 776 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 777 error = dsw->d_close(dev, ap->a_fflag | dflags, S_IFCHR, td); 778 dev_relthread(dev, ref); 779 vn_lock(vp, vp_locked | LK_RETRY); 780 vdrop(vp); 781 return (error); 782 } 783 784 static int 785 devfs_close_f(struct file *fp, struct thread *td) 786 { 787 int error; 788 struct file *fpop; 789 790 /* 791 * NB: td may be NULL if this descriptor is closed due to 792 * garbage collection from a closed UNIX domain socket. 793 */ 794 fpop = curthread->td_fpop; 795 curthread->td_fpop = fp; 796 error = vnops.fo_close(fp, td); 797 curthread->td_fpop = fpop; 798 799 /* 800 * The f_cdevpriv cannot be assigned non-NULL value while we 801 * are destroying the file. 802 */ 803 if (fp->f_cdevpriv != NULL) 804 devfs_fpdrop(fp); 805 return (error); 806 } 807 808 static int 809 devfs_getattr(struct vop_getattr_args *ap) 810 { 811 struct vnode *vp = ap->a_vp; 812 struct vattr *vap = ap->a_vap; 813 struct devfs_dirent *de; 814 struct devfs_mount *dmp; 815 struct cdev *dev; 816 struct timeval boottime; 817 int error; 818 819 error = devfs_populate_vp(vp); 820 if (error != 0) 821 return (error); 822 823 dmp = VFSTODEVFS(vp->v_mount); 824 sx_xunlock(&dmp->dm_lock); 825 826 de = vp->v_data; 827 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 828 if (vp->v_type == VDIR) { 829 de = de->de_dir; 830 KASSERT(de != NULL, 831 ("Null dir dirent in devfs_getattr vp=%p", vp)); 832 } 833 vap->va_uid = de->de_uid; 834 vap->va_gid = de->de_gid; 835 vap->va_mode = de->de_mode; 836 if (vp->v_type == VLNK) 837 vap->va_size = strlen(de->de_symlink); 838 else if (vp->v_type == VDIR) 839 vap->va_size = vap->va_bytes = DEV_BSIZE; 840 else 841 vap->va_size = 0; 842 if (vp->v_type != VDIR) 843 vap->va_bytes = 0; 844 vap->va_blocksize = DEV_BSIZE; 845 vap->va_type = vp->v_type; 846 847 getboottime(&boottime); 848 #define fix(aa) \ 849 do { \ 850 if ((aa).tv_sec <= 3600) { \ 851 (aa).tv_sec = boottime.tv_sec; \ 852 (aa).tv_nsec = boottime.tv_usec * 1000; \ 853 } \ 854 } while (0) 855 856 if (vp->v_type != VCHR) { 857 fix(de->de_atime); 858 vap->va_atime = de->de_atime; 859 fix(de->de_mtime); 860 vap->va_mtime = de->de_mtime; 861 fix(de->de_ctime); 862 vap->va_ctime = de->de_ctime; 863 } else { 864 dev = vp->v_rdev; 865 fix(dev->si_atime); 866 vap->va_atime = dev->si_atime; 867 fix(dev->si_mtime); 868 vap->va_mtime = dev->si_mtime; 869 fix(dev->si_ctime); 870 vap->va_ctime = dev->si_ctime; 871 872 vap->va_rdev = cdev2priv(dev)->cdp_inode; 873 } 874 vap->va_gen = 0; 875 vap->va_flags = 0; 876 vap->va_filerev = 0; 877 vap->va_nlink = de->de_links; 878 vap->va_fileid = de->de_inode; 879 880 return (error); 881 } 882 883 /* ARGSUSED */ 884 static int 885 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 886 { 887 struct file *fpop; 888 int error; 889 890 fpop = td->td_fpop; 891 td->td_fpop = fp; 892 error = vnops.fo_ioctl(fp, com, data, cred, td); 893 td->td_fpop = fpop; 894 return (error); 895 } 896 897 void * 898 fiodgname_buf_get_ptr(void *fgnp, u_long com) 899 { 900 union { 901 struct fiodgname_arg fgn; 902 #ifdef COMPAT_FREEBSD32 903 struct fiodgname_arg32 fgn32; 904 #endif 905 } *fgnup; 906 907 fgnup = fgnp; 908 switch (com) { 909 case FIODGNAME: 910 return (fgnup->fgn.buf); 911 #ifdef COMPAT_FREEBSD32 912 case FIODGNAME_32: 913 return ((void *)(uintptr_t)fgnup->fgn32.buf); 914 #endif 915 default: 916 panic("Unhandled ioctl command %ld", com); 917 } 918 } 919 920 static int 921 devfs_ioctl(struct vop_ioctl_args *ap) 922 { 923 struct fiodgname_arg *fgn; 924 struct vnode *vpold, *vp; 925 struct cdevsw *dsw; 926 struct thread *td; 927 struct session *sess; 928 struct cdev *dev; 929 int error, ref, i; 930 const char *p; 931 u_long com; 932 933 vp = ap->a_vp; 934 com = ap->a_command; 935 td = ap->a_td; 936 937 dsw = devvn_refthread(vp, &dev, &ref); 938 if (dsw == NULL) 939 return (ENXIO); 940 KASSERT(dev->si_refcount > 0, 941 ("devfs: un-referenced struct cdev *(%s)", devtoname(dev))); 942 943 switch (com) { 944 case FIODTYPE: 945 *(int *)ap->a_data = dsw->d_flags & D_TYPEMASK; 946 error = 0; 947 break; 948 case FIODGNAME: 949 #ifdef COMPAT_FREEBSD32 950 case FIODGNAME_32: 951 #endif 952 fgn = ap->a_data; 953 p = devtoname(dev); 954 i = strlen(p) + 1; 955 if (i > fgn->len) 956 error = EINVAL; 957 else 958 error = copyout(p, fiodgname_buf_get_ptr(fgn, com), i); 959 break; 960 default: 961 error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td); 962 } 963 964 dev_relthread(dev, ref); 965 if (error == ENOIOCTL) 966 error = ENOTTY; 967 968 if (error == 0 && com == TIOCSCTTY) { 969 /* 970 * Do nothing if reassigning same control tty, or if the 971 * control tty has already disappeared. If it disappeared, 972 * it's because we were racing with TIOCNOTTY. TIOCNOTTY 973 * already took care of releasing the old vnode and we have 974 * nothing left to do. 975 */ 976 sx_slock(&proctree_lock); 977 sess = td->td_proc->p_session; 978 if (sess->s_ttyvp == vp || sess->s_ttyp == NULL) { 979 sx_sunlock(&proctree_lock); 980 return (0); 981 } 982 983 devfs_ctty_ref(vp); 984 SESS_LOCK(sess); 985 vpold = sess->s_ttyvp; 986 sess->s_ttyvp = vp; 987 sess->s_ttydp = cdev2priv(dev); 988 SESS_UNLOCK(sess); 989 990 sx_sunlock(&proctree_lock); 991 992 /* Get rid of reference to old control tty */ 993 if (vpold) 994 devfs_ctty_unref(vpold); 995 } 996 return (error); 997 } 998 999 /* ARGSUSED */ 1000 static int 1001 devfs_kqfilter_f(struct file *fp, struct knote *kn) 1002 { 1003 struct cdev *dev; 1004 struct cdevsw *dsw; 1005 int error, ref; 1006 struct file *fpop; 1007 struct thread *td; 1008 1009 td = curthread; 1010 fpop = td->td_fpop; 1011 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1012 if (error) 1013 return (error); 1014 error = dsw->d_kqfilter(dev, kn); 1015 td->td_fpop = fpop; 1016 dev_relthread(dev, ref); 1017 return (error); 1018 } 1019 1020 static inline int 1021 devfs_prison_check(struct devfs_dirent *de, struct thread *td) 1022 { 1023 struct cdev_priv *cdp; 1024 struct ucred *dcr; 1025 struct proc *p; 1026 int error; 1027 1028 cdp = de->de_cdp; 1029 if (cdp == NULL) 1030 return (0); 1031 dcr = cdp->cdp_c.si_cred; 1032 if (dcr == NULL) 1033 return (0); 1034 1035 error = prison_check(td->td_ucred, dcr); 1036 if (error == 0) 1037 return (0); 1038 /* We do, however, allow access to the controlling terminal */ 1039 p = td->td_proc; 1040 PROC_LOCK(p); 1041 if (!(p->p_flag & P_CONTROLT)) { 1042 PROC_UNLOCK(p); 1043 return (error); 1044 } 1045 if (p->p_session->s_ttydp == cdp) 1046 error = 0; 1047 PROC_UNLOCK(p); 1048 return (error); 1049 } 1050 1051 static int 1052 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 1053 { 1054 struct componentname *cnp; 1055 struct vnode *dvp, **vpp; 1056 struct thread *td; 1057 struct devfs_dirent *de, *dd; 1058 struct devfs_dirent **dde; 1059 struct devfs_mount *dmp; 1060 struct mount *mp; 1061 struct cdev *cdev; 1062 int error, flags, nameiop, dvplocked; 1063 char specname[SPECNAMELEN + 1], *pname; 1064 1065 td = curthread; 1066 cnp = ap->a_cnp; 1067 vpp = ap->a_vpp; 1068 dvp = ap->a_dvp; 1069 pname = cnp->cn_nameptr; 1070 flags = cnp->cn_flags; 1071 nameiop = cnp->cn_nameiop; 1072 mp = dvp->v_mount; 1073 dmp = VFSTODEVFS(mp); 1074 dd = dvp->v_data; 1075 *vpp = NULL; 1076 1077 if ((flags & ISLASTCN) && nameiop == RENAME) 1078 return (EOPNOTSUPP); 1079 1080 if (dvp->v_type != VDIR) 1081 return (ENOTDIR); 1082 1083 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 1084 return (EIO); 1085 1086 error = vn_dir_check_exec(dvp, cnp); 1087 if (error != 0) 1088 return (error); 1089 1090 if (cnp->cn_namelen == 1 && *pname == '.') { 1091 if ((flags & ISLASTCN) && nameiop != LOOKUP) 1092 return (EINVAL); 1093 *vpp = dvp; 1094 vref(dvp); 1095 return (0); 1096 } 1097 1098 if (flags & ISDOTDOT) { 1099 if ((flags & ISLASTCN) && nameiop != LOOKUP) 1100 return (EINVAL); 1101 de = devfs_parent_dirent(dd); 1102 if (de == NULL) 1103 return (ENOENT); 1104 dvplocked = VOP_ISLOCKED(dvp); 1105 VOP_UNLOCK(dvp); 1106 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, 1107 vpp); 1108 *dm_unlock = 0; 1109 vn_lock(dvp, dvplocked | LK_RETRY); 1110 return (error); 1111 } 1112 1113 dd = dvp->v_data; 1114 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0); 1115 while (de == NULL) { /* While(...) so we can use break */ 1116 1117 if (nameiop == DELETE) 1118 return (ENOENT); 1119 1120 /* 1121 * OK, we didn't have an entry for the name we were asked for 1122 * so we try to see if anybody can create it on demand. 1123 */ 1124 pname = devfs_fqpn(specname, dmp, dd, cnp); 1125 if (pname == NULL) 1126 break; 1127 1128 cdev = NULL; 1129 DEVFS_DMP_HOLD(dmp); 1130 sx_xunlock(&dmp->dm_lock); 1131 EVENTHANDLER_INVOKE(dev_clone, 1132 td->td_ucred, pname, strlen(pname), &cdev); 1133 1134 if (cdev == NULL) 1135 sx_xlock(&dmp->dm_lock); 1136 else if (devfs_populate_vp(dvp) != 0) { 1137 *dm_unlock = 0; 1138 sx_xlock(&dmp->dm_lock); 1139 if (DEVFS_DMP_DROP(dmp)) { 1140 sx_xunlock(&dmp->dm_lock); 1141 devfs_unmount_final(dmp); 1142 } else 1143 sx_xunlock(&dmp->dm_lock); 1144 dev_rel(cdev); 1145 return (ENOENT); 1146 } 1147 if (DEVFS_DMP_DROP(dmp)) { 1148 *dm_unlock = 0; 1149 sx_xunlock(&dmp->dm_lock); 1150 devfs_unmount_final(dmp); 1151 if (cdev != NULL) 1152 dev_rel(cdev); 1153 return (ENOENT); 1154 } 1155 1156 if (cdev == NULL) 1157 break; 1158 1159 dev_lock(); 1160 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx]; 1161 if (dde != NULL && *dde != NULL) 1162 de = *dde; 1163 dev_unlock(); 1164 dev_rel(cdev); 1165 break; 1166 } 1167 1168 if (de == NULL || de->de_flags & DE_WHITEOUT) { 1169 if ((nameiop == CREATE || nameiop == RENAME) && 1170 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 1171 return (EJUSTRETURN); 1172 } 1173 return (ENOENT); 1174 } 1175 1176 if (devfs_prison_check(de, td)) 1177 return (ENOENT); 1178 1179 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 1180 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 1181 if (error) 1182 return (error); 1183 if (*vpp == dvp) { 1184 vref(dvp); 1185 *vpp = dvp; 1186 return (0); 1187 } 1188 } 1189 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, vpp); 1190 *dm_unlock = 0; 1191 return (error); 1192 } 1193 1194 static int 1195 devfs_lookup(struct vop_lookup_args *ap) 1196 { 1197 int j; 1198 struct devfs_mount *dmp; 1199 int dm_unlock; 1200 1201 if (devfs_populate_vp(ap->a_dvp) != 0) 1202 return (ENOTDIR); 1203 1204 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1205 dm_unlock = 1; 1206 j = devfs_lookupx(ap, &dm_unlock); 1207 if (dm_unlock == 1) 1208 sx_xunlock(&dmp->dm_lock); 1209 return (j); 1210 } 1211 1212 static int 1213 devfs_mknod(struct vop_mknod_args *ap) 1214 { 1215 struct componentname *cnp; 1216 struct vnode *dvp, **vpp; 1217 struct devfs_dirent *dd, *de; 1218 struct devfs_mount *dmp; 1219 int error; 1220 1221 /* 1222 * The only type of node we should be creating here is a 1223 * character device, for anything else return EOPNOTSUPP. 1224 */ 1225 if (ap->a_vap->va_type != VCHR) 1226 return (EOPNOTSUPP); 1227 dvp = ap->a_dvp; 1228 dmp = VFSTODEVFS(dvp->v_mount); 1229 1230 cnp = ap->a_cnp; 1231 vpp = ap->a_vpp; 1232 dd = dvp->v_data; 1233 1234 error = ENOENT; 1235 sx_xlock(&dmp->dm_lock); 1236 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 1237 if (cnp->cn_namelen != de->de_dirent->d_namlen) 1238 continue; 1239 if (de->de_dirent->d_type == DT_CHR && 1240 (de->de_cdp->cdp_flags & CDP_ACTIVE) == 0) 1241 continue; 1242 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 1243 de->de_dirent->d_namlen) != 0) 1244 continue; 1245 if (de->de_flags & DE_WHITEOUT) 1246 break; 1247 goto notfound; 1248 } 1249 if (de == NULL) 1250 goto notfound; 1251 de->de_flags &= ~DE_WHITEOUT; 1252 error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp); 1253 return (error); 1254 notfound: 1255 sx_xunlock(&dmp->dm_lock); 1256 return (error); 1257 } 1258 1259 /* ARGSUSED */ 1260 static int 1261 devfs_open(struct vop_open_args *ap) 1262 { 1263 struct thread *td = ap->a_td; 1264 struct vnode *vp = ap->a_vp; 1265 struct cdev *dev = vp->v_rdev; 1266 struct file *fp = ap->a_fp; 1267 int error, ref, vlocked; 1268 struct cdevsw *dsw; 1269 struct file *fpop; 1270 1271 if (vp->v_type == VBLK) 1272 return (ENXIO); 1273 1274 if (dev == NULL) 1275 return (ENXIO); 1276 1277 /* Make this field valid before any I/O in d_open. */ 1278 if (dev->si_iosize_max == 0) 1279 dev->si_iosize_max = DFLTPHYS; 1280 1281 dsw = dev_refthread(dev, &ref); 1282 if (dsw == NULL) 1283 return (ENXIO); 1284 if (fp == NULL && dsw->d_fdopen != NULL) { 1285 dev_relthread(dev, ref); 1286 return (ENXIO); 1287 } 1288 1289 if (vp->v_type == VCHR) 1290 devfs_usecount_add(vp); 1291 1292 vlocked = VOP_ISLOCKED(vp); 1293 VOP_UNLOCK(vp); 1294 1295 fpop = td->td_fpop; 1296 td->td_fpop = fp; 1297 if (fp != NULL) { 1298 fp->f_data = dev; 1299 fp->f_vnode = vp; 1300 } 1301 if (dsw->d_fdopen != NULL) 1302 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 1303 else 1304 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 1305 /* Clean up any cdevpriv upon error. */ 1306 if (error != 0) 1307 devfs_clear_cdevpriv(); 1308 td->td_fpop = fpop; 1309 1310 vn_lock(vp, vlocked | LK_RETRY); 1311 if (error != 0 && vp->v_type == VCHR) 1312 devfs_usecount_sub(vp); 1313 1314 dev_relthread(dev, ref); 1315 if (error != 0) { 1316 if (error == ERESTART) 1317 error = EINTR; 1318 return (error); 1319 } 1320 1321 #if 0 /* /dev/console */ 1322 KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp")); 1323 #else 1324 if (fp == NULL) 1325 return (error); 1326 #endif 1327 if (fp->f_ops == &badfileops) 1328 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f); 1329 return (error); 1330 } 1331 1332 static int 1333 devfs_pathconf(struct vop_pathconf_args *ap) 1334 { 1335 1336 switch (ap->a_name) { 1337 case _PC_FILESIZEBITS: 1338 *ap->a_retval = 64; 1339 return (0); 1340 case _PC_NAME_MAX: 1341 *ap->a_retval = NAME_MAX; 1342 return (0); 1343 case _PC_LINK_MAX: 1344 *ap->a_retval = INT_MAX; 1345 return (0); 1346 case _PC_SYMLINK_MAX: 1347 *ap->a_retval = MAXPATHLEN; 1348 return (0); 1349 case _PC_MAX_CANON: 1350 if (ap->a_vp->v_vflag & VV_ISTTY) { 1351 *ap->a_retval = MAX_CANON; 1352 return (0); 1353 } 1354 return (EINVAL); 1355 case _PC_MAX_INPUT: 1356 if (ap->a_vp->v_vflag & VV_ISTTY) { 1357 *ap->a_retval = MAX_INPUT; 1358 return (0); 1359 } 1360 return (EINVAL); 1361 case _PC_VDISABLE: 1362 if (ap->a_vp->v_vflag & VV_ISTTY) { 1363 *ap->a_retval = _POSIX_VDISABLE; 1364 return (0); 1365 } 1366 return (EINVAL); 1367 case _PC_MAC_PRESENT: 1368 #ifdef MAC 1369 /* 1370 * If MAC is enabled, devfs automatically supports 1371 * trivial non-persistent label storage. 1372 */ 1373 *ap->a_retval = 1; 1374 #else 1375 *ap->a_retval = 0; 1376 #endif 1377 return (0); 1378 case _PC_CHOWN_RESTRICTED: 1379 *ap->a_retval = 1; 1380 return (0); 1381 default: 1382 return (vop_stdpathconf(ap)); 1383 } 1384 /* NOTREACHED */ 1385 } 1386 1387 /* ARGSUSED */ 1388 static int 1389 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 1390 { 1391 struct cdev *dev; 1392 struct cdevsw *dsw; 1393 int error, ref; 1394 struct file *fpop; 1395 1396 fpop = td->td_fpop; 1397 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1398 if (error != 0) { 1399 error = vnops.fo_poll(fp, events, cred, td); 1400 return (error); 1401 } 1402 error = dsw->d_poll(dev, events, td); 1403 td->td_fpop = fpop; 1404 dev_relthread(dev, ref); 1405 return(error); 1406 } 1407 1408 /* 1409 * Print out the contents of a special device vnode. 1410 */ 1411 static int 1412 devfs_print(struct vop_print_args *ap) 1413 { 1414 1415 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 1416 return (0); 1417 } 1418 1419 static int 1420 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, 1421 int flags, struct thread *td) 1422 { 1423 struct cdev *dev; 1424 int ioflag, error, ref; 1425 ssize_t resid; 1426 struct cdevsw *dsw; 1427 struct file *fpop; 1428 1429 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1430 return (EINVAL); 1431 fpop = td->td_fpop; 1432 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1433 if (error != 0) { 1434 error = vnops.fo_read(fp, uio, cred, flags, td); 1435 return (error); 1436 } 1437 resid = uio->uio_resid; 1438 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 1439 if (ioflag & O_DIRECT) 1440 ioflag |= IO_DIRECT; 1441 1442 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1443 error = dsw->d_read(dev, uio, ioflag); 1444 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 1445 devfs_timestamp(&dev->si_atime); 1446 td->td_fpop = fpop; 1447 dev_relthread(dev, ref); 1448 1449 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_R); 1450 return (error); 1451 } 1452 1453 static int 1454 devfs_readdir(struct vop_readdir_args *ap) 1455 { 1456 int error; 1457 struct uio *uio; 1458 struct dirent *dp; 1459 struct devfs_dirent *dd; 1460 struct devfs_dirent *de; 1461 struct devfs_mount *dmp; 1462 off_t off; 1463 int *tmp_ncookies = NULL; 1464 ssize_t startresid; 1465 1466 if (ap->a_vp->v_type != VDIR) 1467 return (ENOTDIR); 1468 1469 uio = ap->a_uio; 1470 if (uio->uio_offset < 0) 1471 return (EINVAL); 1472 1473 /* 1474 * XXX: This is a temporary hack to get around this filesystem not 1475 * supporting cookies. We store the location of the ncookies pointer 1476 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 1477 * and set the number of cookies to 0. We then set the pointer to 1478 * NULL so that vfs_read_dirent doesn't try to call realloc() on 1479 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 1480 * pointer to its original location before returning to the caller. 1481 */ 1482 if (ap->a_ncookies != NULL) { 1483 tmp_ncookies = ap->a_ncookies; 1484 *ap->a_ncookies = 0; 1485 ap->a_ncookies = NULL; 1486 } 1487 1488 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1489 if (devfs_populate_vp(ap->a_vp) != 0) { 1490 if (tmp_ncookies != NULL) 1491 ap->a_ncookies = tmp_ncookies; 1492 return (EIO); 1493 } 1494 error = 0; 1495 de = ap->a_vp->v_data; 1496 off = 0; 1497 startresid = uio->uio_resid; 1498 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 1499 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 1500 if (dd->de_flags & (DE_COVERED | DE_WHITEOUT)) 1501 continue; 1502 if (devfs_prison_check(dd, uio->uio_td)) 1503 continue; 1504 if (dd->de_dirent->d_type == DT_DIR) 1505 de = dd->de_dir; 1506 else 1507 de = dd; 1508 dp = dd->de_dirent; 1509 MPASS(dp->d_reclen == GENERIC_DIRSIZ(dp)); 1510 if (dp->d_reclen > uio->uio_resid) { 1511 /* Nothing was copied out, return EINVAL. */ 1512 if (uio->uio_resid == startresid) 1513 error = EINVAL; 1514 /* Otherwise stop. */ 1515 break; 1516 } 1517 dp->d_fileno = de->de_inode; 1518 /* NOTE: d_off is the offset for the *next* entry. */ 1519 dp->d_off = off + dp->d_reclen; 1520 if (off >= uio->uio_offset) { 1521 error = vfs_read_dirent(ap, dp, off); 1522 if (error) 1523 break; 1524 } 1525 off += dp->d_reclen; 1526 } 1527 sx_xunlock(&dmp->dm_lock); 1528 uio->uio_offset = off; 1529 1530 /* 1531 * Restore ap->a_ncookies if it wasn't originally NULL in the first 1532 * place. 1533 */ 1534 if (tmp_ncookies != NULL) 1535 ap->a_ncookies = tmp_ncookies; 1536 if (dd == NULL && error == 0 && ap->a_eofflag != NULL) 1537 *ap->a_eofflag = 1; 1538 1539 return (error); 1540 } 1541 1542 static int 1543 devfs_readlink(struct vop_readlink_args *ap) 1544 { 1545 struct devfs_dirent *de; 1546 1547 de = ap->a_vp->v_data; 1548 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 1549 } 1550 1551 static void 1552 devfs_reclaiml(struct vnode *vp) 1553 { 1554 struct devfs_dirent *de; 1555 1556 mtx_assert(&devfs_de_interlock, MA_OWNED); 1557 de = vp->v_data; 1558 if (de != NULL) { 1559 MPASS(de->de_usecount == 0); 1560 de->de_vnode = NULL; 1561 vp->v_data = NULL; 1562 } 1563 } 1564 1565 static int 1566 devfs_reclaim(struct vop_reclaim_args *ap) 1567 { 1568 struct vnode *vp; 1569 1570 vp = ap->a_vp; 1571 mtx_lock(&devfs_de_interlock); 1572 devfs_reclaiml(vp); 1573 mtx_unlock(&devfs_de_interlock); 1574 return (0); 1575 } 1576 1577 static int 1578 devfs_reclaim_vchr(struct vop_reclaim_args *ap) 1579 { 1580 struct vnode *vp; 1581 struct cdev *dev; 1582 1583 vp = ap->a_vp; 1584 MPASS(vp->v_type == VCHR); 1585 1586 mtx_lock(&devfs_de_interlock); 1587 VI_LOCK(vp); 1588 devfs_usecount_subl(vp); 1589 devfs_reclaiml(vp); 1590 mtx_unlock(&devfs_de_interlock); 1591 dev_lock(); 1592 dev = vp->v_rdev; 1593 vp->v_rdev = NULL; 1594 dev_unlock(); 1595 VI_UNLOCK(vp); 1596 if (dev != NULL) 1597 dev_rel(dev); 1598 return (0); 1599 } 1600 1601 static int 1602 devfs_remove(struct vop_remove_args *ap) 1603 { 1604 struct vnode *dvp = ap->a_dvp; 1605 struct vnode *vp = ap->a_vp; 1606 struct devfs_dirent *dd; 1607 struct devfs_dirent *de, *de_covered; 1608 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1609 1610 ASSERT_VOP_ELOCKED(dvp, "devfs_remove"); 1611 ASSERT_VOP_ELOCKED(vp, "devfs_remove"); 1612 1613 sx_xlock(&dmp->dm_lock); 1614 dd = ap->a_dvp->v_data; 1615 de = vp->v_data; 1616 if (de->de_cdp == NULL) { 1617 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1618 if (de->de_dirent->d_type == DT_LNK) { 1619 de_covered = devfs_find(dd, de->de_dirent->d_name, 1620 de->de_dirent->d_namlen, 0); 1621 if (de_covered != NULL) 1622 de_covered->de_flags &= ~DE_COVERED; 1623 } 1624 /* We need to unlock dvp because devfs_delete() may lock it. */ 1625 VOP_UNLOCK(vp); 1626 if (dvp != vp) 1627 VOP_UNLOCK(dvp); 1628 devfs_delete(dmp, de, 0); 1629 sx_xunlock(&dmp->dm_lock); 1630 if (dvp != vp) 1631 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1632 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1633 } else { 1634 de->de_flags |= DE_WHITEOUT; 1635 sx_xunlock(&dmp->dm_lock); 1636 } 1637 return (0); 1638 } 1639 1640 /* 1641 * Revoke is called on a tty when a terminal session ends. The vnode 1642 * is orphaned by setting v_op to deadfs so we need to let go of it 1643 * as well so that we create a new one next time around. 1644 * 1645 */ 1646 static int 1647 devfs_revoke(struct vop_revoke_args *ap) 1648 { 1649 struct vnode *vp = ap->a_vp, *vp2; 1650 struct cdev *dev; 1651 struct cdev_priv *cdp; 1652 struct devfs_dirent *de; 1653 enum vgetstate vs; 1654 u_int i; 1655 1656 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1657 1658 dev = vp->v_rdev; 1659 cdp = cdev2priv(dev); 1660 1661 dev_lock(); 1662 cdp->cdp_inuse++; 1663 dev_unlock(); 1664 1665 vhold(vp); 1666 vgone(vp); 1667 vdrop(vp); 1668 1669 VOP_UNLOCK(vp); 1670 loop: 1671 for (;;) { 1672 mtx_lock(&devfs_de_interlock); 1673 dev_lock(); 1674 vp2 = NULL; 1675 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1676 de = cdp->cdp_dirents[i]; 1677 if (de == NULL) 1678 continue; 1679 1680 vp2 = de->de_vnode; 1681 if (vp2 != NULL) { 1682 dev_unlock(); 1683 vs = vget_prep(vp2); 1684 mtx_unlock(&devfs_de_interlock); 1685 if (vget_finish(vp2, LK_EXCLUSIVE, vs) != 0) 1686 goto loop; 1687 vhold(vp2); 1688 vgone(vp2); 1689 vdrop(vp2); 1690 vput(vp2); 1691 break; 1692 } 1693 } 1694 if (vp2 != NULL) { 1695 continue; 1696 } 1697 dev_unlock(); 1698 mtx_unlock(&devfs_de_interlock); 1699 break; 1700 } 1701 dev_lock(); 1702 cdp->cdp_inuse--; 1703 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1704 KASSERT((cdp->cdp_flags & CDP_ON_ACTIVE_LIST) != 0, 1705 ("%s: cdp %p (%s) not on active list", 1706 __func__, cdp, dev->si_name)); 1707 cdp->cdp_flags &= ~CDP_ON_ACTIVE_LIST; 1708 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1709 dev_unlock(); 1710 dev_rel(&cdp->cdp_c); 1711 } else 1712 dev_unlock(); 1713 1714 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1715 return (0); 1716 } 1717 1718 static int 1719 devfs_rioctl(struct vop_ioctl_args *ap) 1720 { 1721 struct vnode *vp; 1722 struct devfs_mount *dmp; 1723 int error; 1724 1725 vp = ap->a_vp; 1726 vn_lock(vp, LK_SHARED | LK_RETRY); 1727 if (VN_IS_DOOMED(vp)) { 1728 VOP_UNLOCK(vp); 1729 return (EBADF); 1730 } 1731 dmp = VFSTODEVFS(vp->v_mount); 1732 sx_xlock(&dmp->dm_lock); 1733 VOP_UNLOCK(vp); 1734 DEVFS_DMP_HOLD(dmp); 1735 devfs_populate(dmp); 1736 if (DEVFS_DMP_DROP(dmp)) { 1737 sx_xunlock(&dmp->dm_lock); 1738 devfs_unmount_final(dmp); 1739 return (ENOENT); 1740 } 1741 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1742 sx_xunlock(&dmp->dm_lock); 1743 return (error); 1744 } 1745 1746 static int 1747 devfs_rread(struct vop_read_args *ap) 1748 { 1749 1750 if (ap->a_vp->v_type != VDIR) 1751 return (EINVAL); 1752 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1753 } 1754 1755 static int 1756 devfs_setattr(struct vop_setattr_args *ap) 1757 { 1758 struct devfs_dirent *de; 1759 struct vattr *vap; 1760 struct vnode *vp; 1761 struct thread *td; 1762 int c, error; 1763 uid_t uid; 1764 gid_t gid; 1765 1766 vap = ap->a_vap; 1767 vp = ap->a_vp; 1768 td = curthread; 1769 if ((vap->va_type != VNON) || 1770 (vap->va_nlink != VNOVAL) || 1771 (vap->va_fsid != VNOVAL) || 1772 (vap->va_fileid != VNOVAL) || 1773 (vap->va_blocksize != VNOVAL) || 1774 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1775 (vap->va_rdev != VNOVAL) || 1776 ((int)vap->va_bytes != VNOVAL) || 1777 (vap->va_gen != VNOVAL)) { 1778 return (EINVAL); 1779 } 1780 1781 error = devfs_populate_vp(vp); 1782 if (error != 0) 1783 return (error); 1784 1785 de = vp->v_data; 1786 if (vp->v_type == VDIR) 1787 de = de->de_dir; 1788 1789 c = 0; 1790 if (vap->va_uid == (uid_t)VNOVAL) 1791 uid = de->de_uid; 1792 else 1793 uid = vap->va_uid; 1794 if (vap->va_gid == (gid_t)VNOVAL) 1795 gid = de->de_gid; 1796 else 1797 gid = vap->va_gid; 1798 if (uid != de->de_uid || gid != de->de_gid) { 1799 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1800 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1801 error = priv_check(td, PRIV_VFS_CHOWN); 1802 if (error != 0) 1803 goto ret; 1804 } 1805 de->de_uid = uid; 1806 de->de_gid = gid; 1807 c = 1; 1808 } 1809 1810 if (vap->va_mode != (mode_t)VNOVAL) { 1811 if (ap->a_cred->cr_uid != de->de_uid) { 1812 error = priv_check(td, PRIV_VFS_ADMIN); 1813 if (error != 0) 1814 goto ret; 1815 } 1816 de->de_mode = vap->va_mode; 1817 c = 1; 1818 } 1819 1820 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1821 error = vn_utimes_perm(vp, vap, ap->a_cred, td); 1822 if (error != 0) 1823 goto ret; 1824 if (vap->va_atime.tv_sec != VNOVAL) { 1825 if (vp->v_type == VCHR) 1826 vp->v_rdev->si_atime = vap->va_atime; 1827 else 1828 de->de_atime = vap->va_atime; 1829 } 1830 if (vap->va_mtime.tv_sec != VNOVAL) { 1831 if (vp->v_type == VCHR) 1832 vp->v_rdev->si_mtime = vap->va_mtime; 1833 else 1834 de->de_mtime = vap->va_mtime; 1835 } 1836 c = 1; 1837 } 1838 1839 if (c) { 1840 if (vp->v_type == VCHR) 1841 vfs_timestamp(&vp->v_rdev->si_ctime); 1842 else 1843 vfs_timestamp(&de->de_mtime); 1844 } 1845 1846 ret: 1847 sx_xunlock(&VFSTODEVFS(vp->v_mount)->dm_lock); 1848 return (error); 1849 } 1850 1851 #ifdef MAC 1852 static int 1853 devfs_setlabel(struct vop_setlabel_args *ap) 1854 { 1855 struct vnode *vp; 1856 struct devfs_dirent *de; 1857 1858 vp = ap->a_vp; 1859 de = vp->v_data; 1860 1861 mac_vnode_relabel(ap->a_cred, vp, ap->a_label); 1862 mac_devfs_update(vp->v_mount, de, vp); 1863 1864 return (0); 1865 } 1866 #endif 1867 1868 static int 1869 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred) 1870 { 1871 1872 return (vnops.fo_stat(fp, sb, cred)); 1873 } 1874 1875 static int 1876 devfs_symlink(struct vop_symlink_args *ap) 1877 { 1878 int i, error; 1879 struct devfs_dirent *dd; 1880 struct devfs_dirent *de, *de_covered, *de_dotdot; 1881 struct devfs_mount *dmp; 1882 1883 error = priv_check(curthread, PRIV_DEVFS_SYMLINK); 1884 if (error) 1885 return(error); 1886 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1887 if (devfs_populate_vp(ap->a_dvp) != 0) 1888 return (ENOENT); 1889 1890 dd = ap->a_dvp->v_data; 1891 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1892 de->de_flags = DE_USER; 1893 de->de_uid = 0; 1894 de->de_gid = 0; 1895 de->de_mode = 0755; 1896 de->de_inode = alloc_unr(devfs_inos); 1897 de->de_dir = dd; 1898 de->de_dirent->d_type = DT_LNK; 1899 i = strlen(ap->a_target) + 1; 1900 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1901 bcopy(ap->a_target, de->de_symlink, i); 1902 #ifdef MAC 1903 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1904 #endif 1905 de_covered = devfs_find(dd, de->de_dirent->d_name, 1906 de->de_dirent->d_namlen, 0); 1907 if (de_covered != NULL) { 1908 if ((de_covered->de_flags & DE_USER) != 0) { 1909 devfs_delete(dmp, de, DEVFS_DEL_NORECURSE); 1910 sx_xunlock(&dmp->dm_lock); 1911 return (EEXIST); 1912 } 1913 KASSERT((de_covered->de_flags & DE_COVERED) == 0, 1914 ("devfs_symlink: entry %p already covered", de_covered)); 1915 de_covered->de_flags |= DE_COVERED; 1916 } 1917 1918 de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */ 1919 de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */ 1920 TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list); 1921 devfs_dir_ref_de(dmp, dd); 1922 devfs_rules_apply(dmp, de); 1923 1924 return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp)); 1925 } 1926 1927 static int 1928 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) 1929 { 1930 1931 return (vnops.fo_truncate(fp, length, cred, td)); 1932 } 1933 1934 static int 1935 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, 1936 int flags, struct thread *td) 1937 { 1938 struct cdev *dev; 1939 int error, ioflag, ref; 1940 ssize_t resid; 1941 struct cdevsw *dsw; 1942 struct file *fpop; 1943 1944 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1945 return (EINVAL); 1946 fpop = td->td_fpop; 1947 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1948 if (error != 0) { 1949 error = vnops.fo_write(fp, uio, cred, flags, td); 1950 return (error); 1951 } 1952 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1953 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1954 if (ioflag & O_DIRECT) 1955 ioflag |= IO_DIRECT; 1956 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1957 1958 resid = uio->uio_resid; 1959 1960 error = dsw->d_write(dev, uio, ioflag); 1961 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1962 devfs_timestamp(&dev->si_ctime); 1963 dev->si_mtime = dev->si_ctime; 1964 } 1965 td->td_fpop = fpop; 1966 dev_relthread(dev, ref); 1967 1968 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_W); 1969 return (error); 1970 } 1971 1972 static int 1973 devfs_mmap_f(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size, 1974 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff, 1975 struct thread *td) 1976 { 1977 struct cdev *dev; 1978 struct cdevsw *dsw; 1979 struct mount *mp; 1980 struct vnode *vp; 1981 struct file *fpop; 1982 vm_object_t object; 1983 vm_prot_t maxprot; 1984 int error, ref; 1985 1986 vp = fp->f_vnode; 1987 1988 /* 1989 * Ensure that file and memory protections are 1990 * compatible. 1991 */ 1992 mp = vp->v_mount; 1993 if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0) { 1994 maxprot = VM_PROT_NONE; 1995 if ((prot & VM_PROT_EXECUTE) != 0) 1996 return (EACCES); 1997 } else 1998 maxprot = VM_PROT_EXECUTE; 1999 if ((fp->f_flag & FREAD) != 0) 2000 maxprot |= VM_PROT_READ; 2001 else if ((prot & VM_PROT_READ) != 0) 2002 return (EACCES); 2003 2004 /* 2005 * If we are sharing potential changes via MAP_SHARED and we 2006 * are trying to get write permission although we opened it 2007 * without asking for it, bail out. 2008 * 2009 * Note that most character devices always share mappings. 2010 * The one exception is that D_MMAP_ANON devices 2011 * (i.e. /dev/zero) permit private writable mappings. 2012 * 2013 * Rely on vm_mmap_cdev() to fail invalid MAP_PRIVATE requests 2014 * as well as updating maxprot to permit writing for 2015 * D_MMAP_ANON devices rather than doing that here. 2016 */ 2017 if ((flags & MAP_SHARED) != 0) { 2018 if ((fp->f_flag & FWRITE) != 0) 2019 maxprot |= VM_PROT_WRITE; 2020 else if ((prot & VM_PROT_WRITE) != 0) 2021 return (EACCES); 2022 } 2023 maxprot &= cap_maxprot; 2024 2025 fpop = td->td_fpop; 2026 error = devfs_fp_check(fp, &dev, &dsw, &ref); 2027 if (error != 0) 2028 return (error); 2029 2030 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, dev, dsw, &foff, 2031 &object); 2032 td->td_fpop = fpop; 2033 dev_relthread(dev, ref); 2034 if (error != 0) 2035 return (error); 2036 2037 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object, 2038 foff, FALSE, td); 2039 if (error != 0) 2040 vm_object_deallocate(object); 2041 return (error); 2042 } 2043 2044 dev_t 2045 dev2udev(struct cdev *x) 2046 { 2047 if (x == NULL) 2048 return (NODEV); 2049 return (cdev2priv(x)->cdp_inode); 2050 } 2051 2052 static int 2053 devfs_cmp_f(struct file *fp1, struct file *fp2, struct thread *td) 2054 { 2055 if (fp2->f_type != DTYPE_VNODE || fp2->f_ops != &devfs_ops_f) 2056 return (3); 2057 return (kcmp_cmp((uintptr_t)fp1->f_data, (uintptr_t)fp2->f_data)); 2058 } 2059 2060 static const struct fileops devfs_ops_f = { 2061 .fo_read = devfs_read_f, 2062 .fo_write = devfs_write_f, 2063 .fo_truncate = devfs_truncate_f, 2064 .fo_ioctl = devfs_ioctl_f, 2065 .fo_poll = devfs_poll_f, 2066 .fo_kqfilter = devfs_kqfilter_f, 2067 .fo_stat = devfs_stat_f, 2068 .fo_close = devfs_close_f, 2069 .fo_chmod = vn_chmod, 2070 .fo_chown = vn_chown, 2071 .fo_sendfile = vn_sendfile, 2072 .fo_seek = vn_seek, 2073 .fo_fill_kinfo = vn_fill_kinfo, 2074 .fo_mmap = devfs_mmap_f, 2075 .fo_cmp = devfs_cmp_f, 2076 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 2077 }; 2078 2079 /* Vops for non-CHR vnodes in /dev. */ 2080 static struct vop_vector devfs_vnodeops = { 2081 .vop_default = &default_vnodeops, 2082 2083 .vop_access = devfs_access, 2084 .vop_getattr = devfs_getattr, 2085 .vop_ioctl = devfs_rioctl, 2086 .vop_lookup = devfs_lookup, 2087 .vop_mknod = devfs_mknod, 2088 .vop_pathconf = devfs_pathconf, 2089 .vop_read = devfs_rread, 2090 .vop_readdir = devfs_readdir, 2091 .vop_readlink = devfs_readlink, 2092 .vop_reclaim = devfs_reclaim, 2093 .vop_remove = devfs_remove, 2094 .vop_revoke = devfs_revoke, 2095 .vop_setattr = devfs_setattr, 2096 #ifdef MAC 2097 .vop_setlabel = devfs_setlabel, 2098 #endif 2099 .vop_symlink = devfs_symlink, 2100 .vop_vptocnp = devfs_vptocnp, 2101 .vop_lock1 = vop_lock, 2102 .vop_unlock = vop_unlock, 2103 .vop_islocked = vop_islocked, 2104 .vop_add_writecount = vop_stdadd_writecount_nomsync, 2105 }; 2106 VFS_VOP_VECTOR_REGISTER(devfs_vnodeops); 2107 2108 /* Vops for VCHR vnodes in /dev. */ 2109 static struct vop_vector devfs_specops = { 2110 .vop_default = &default_vnodeops, 2111 2112 .vop_access = devfs_access, 2113 .vop_bmap = VOP_PANIC, 2114 .vop_close = devfs_close, 2115 .vop_create = VOP_PANIC, 2116 .vop_fsync = vop_stdfsync, 2117 .vop_getattr = devfs_getattr, 2118 .vop_ioctl = devfs_ioctl, 2119 .vop_link = VOP_PANIC, 2120 .vop_mkdir = VOP_PANIC, 2121 .vop_mknod = VOP_PANIC, 2122 .vop_open = devfs_open, 2123 .vop_pathconf = devfs_pathconf, 2124 .vop_poll = dead_poll, 2125 .vop_print = devfs_print, 2126 .vop_read = dead_read, 2127 .vop_readdir = VOP_PANIC, 2128 .vop_readlink = VOP_PANIC, 2129 .vop_reallocblks = VOP_PANIC, 2130 .vop_reclaim = devfs_reclaim_vchr, 2131 .vop_remove = devfs_remove, 2132 .vop_rename = VOP_PANIC, 2133 .vop_revoke = devfs_revoke, 2134 .vop_rmdir = VOP_PANIC, 2135 .vop_setattr = devfs_setattr, 2136 #ifdef MAC 2137 .vop_setlabel = devfs_setlabel, 2138 #endif 2139 .vop_strategy = VOP_PANIC, 2140 .vop_symlink = VOP_PANIC, 2141 .vop_vptocnp = devfs_vptocnp, 2142 .vop_write = dead_write, 2143 .vop_lock1 = vop_lock, 2144 .vop_unlock = vop_unlock, 2145 .vop_islocked = vop_islocked, 2146 .vop_add_writecount = vop_stdadd_writecount_nomsync, 2147 }; 2148 VFS_VOP_VECTOR_REGISTER(devfs_specops); 2149 2150 /* 2151 * Our calling convention to the device drivers used to be that we passed 2152 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 2153 * flags instead since that's what open(), close() and ioctl() takes and 2154 * we don't really want vnode.h in device drivers. 2155 * We solved the source compatibility by redefining some vnode flags to 2156 * be the same as the fcntl ones and by sending down the bitwise OR of 2157 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 2158 * pulls the rug out under this. 2159 */ 2160 CTASSERT(O_NONBLOCK == IO_NDELAY); 2161 CTASSERT(O_FSYNC == IO_SYNC); 2162