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 if (VN_IS_DOOMED(vp)) 371 return (ENOENT); 372 373 dmp = VFSTODEVFS(vp->v_mount); 374 if (!devfs_populate_needed(dmp)) { 375 sx_xlock(&dmp->dm_lock); 376 goto out_nopopulate; 377 } 378 379 locked = VOP_ISLOCKED(vp); 380 381 sx_xlock(&dmp->dm_lock); 382 DEVFS_DMP_HOLD(dmp); 383 384 /* Can't call devfs_populate() with the vnode lock held. */ 385 VOP_UNLOCK(vp); 386 devfs_populate(dmp); 387 388 sx_xunlock(&dmp->dm_lock); 389 vn_lock(vp, locked | LK_RETRY); 390 sx_xlock(&dmp->dm_lock); 391 if (DEVFS_DMP_DROP(dmp)) { 392 sx_xunlock(&dmp->dm_lock); 393 devfs_unmount_final(dmp); 394 return (ERESTART); 395 } 396 out_nopopulate: 397 if (VN_IS_DOOMED(vp)) { 398 sx_xunlock(&dmp->dm_lock); 399 return (ERESTART); 400 } 401 de = vp->v_data; 402 KASSERT(de != NULL, 403 ("devfs_populate_vp: vp->v_data == NULL but vnode not doomed")); 404 if ((de->de_flags & DE_DOOMED) != 0) { 405 sx_xunlock(&dmp->dm_lock); 406 return (ERESTART); 407 } 408 409 return (0); 410 } 411 412 static int 413 devfs_vptocnp(struct vop_vptocnp_args *ap) 414 { 415 struct vnode *vp = ap->a_vp; 416 struct vnode **dvp = ap->a_vpp; 417 struct devfs_mount *dmp; 418 char *buf = ap->a_buf; 419 size_t *buflen = ap->a_buflen; 420 struct devfs_dirent *dd, *de; 421 int i, error; 422 423 dmp = VFSTODEVFS(vp->v_mount); 424 425 error = devfs_populate_vp(vp); 426 if (error != 0) 427 return (error); 428 429 if (vp->v_type != VCHR && vp->v_type != VDIR) { 430 error = ENOENT; 431 goto finished; 432 } 433 434 dd = vp->v_data; 435 if (vp->v_type == VDIR && dd == dmp->dm_rootdir) { 436 *dvp = vp; 437 vref(*dvp); 438 goto finished; 439 } 440 441 i = *buflen; 442 i -= dd->de_dirent->d_namlen; 443 if (i < 0) { 444 error = ENOMEM; 445 goto finished; 446 } 447 bcopy(dd->de_dirent->d_name, buf + i, dd->de_dirent->d_namlen); 448 *buflen = i; 449 de = devfs_parent_dirent(dd); 450 if (de == NULL) { 451 error = ENOENT; 452 goto finished; 453 } 454 mtx_lock(&devfs_de_interlock); 455 *dvp = de->de_vnode; 456 if (*dvp != NULL) { 457 VI_LOCK(*dvp); 458 mtx_unlock(&devfs_de_interlock); 459 vholdl(*dvp); 460 VI_UNLOCK(*dvp); 461 vref(*dvp); 462 vdrop(*dvp); 463 } else { 464 mtx_unlock(&devfs_de_interlock); 465 error = ENOENT; 466 } 467 finished: 468 sx_xunlock(&dmp->dm_lock); 469 return (error); 470 } 471 472 /* 473 * Construct the fully qualified path name relative to the mountpoint. 474 * If a NULL cnp is provided, no '/' is appended to the resulting path. 475 */ 476 char * 477 devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd, 478 struct componentname *cnp) 479 { 480 int i; 481 struct devfs_dirent *de; 482 483 sx_assert(&dmp->dm_lock, SA_LOCKED); 484 485 i = SPECNAMELEN; 486 buf[i] = '\0'; 487 if (cnp != NULL) 488 i -= cnp->cn_namelen; 489 if (i < 0) 490 return (NULL); 491 if (cnp != NULL) 492 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); 493 de = dd; 494 while (de != dmp->dm_rootdir) { 495 if (cnp != NULL || i < SPECNAMELEN) { 496 i--; 497 if (i < 0) 498 return (NULL); 499 buf[i] = '/'; 500 } 501 i -= de->de_dirent->d_namlen; 502 if (i < 0) 503 return (NULL); 504 bcopy(de->de_dirent->d_name, buf + i, 505 de->de_dirent->d_namlen); 506 de = devfs_parent_dirent(de); 507 if (de == NULL) 508 return (NULL); 509 } 510 return (buf + i); 511 } 512 513 static int 514 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp, 515 struct devfs_dirent *de) 516 { 517 int not_found; 518 519 not_found = 0; 520 if (de->de_flags & DE_DOOMED) 521 not_found = 1; 522 if (DEVFS_DE_DROP(de)) { 523 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed")); 524 devfs_dirent_free(de); 525 } 526 if (DEVFS_DMP_DROP(dmp)) { 527 KASSERT(not_found == 1, 528 ("DEVFS mount struct freed before dirent")); 529 not_found = 2; 530 sx_xunlock(&dmp->dm_lock); 531 devfs_unmount_final(dmp); 532 } 533 if (not_found == 1 || (drop_dm_lock && not_found != 2)) 534 sx_unlock(&dmp->dm_lock); 535 return (not_found); 536 } 537 538 /* 539 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops 540 * it on return. 541 */ 542 int 543 devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode, 544 struct vnode **vpp) 545 { 546 int error; 547 struct vnode *vp; 548 struct cdev *dev; 549 struct devfs_mount *dmp; 550 struct cdevsw *dsw; 551 enum vgetstate vs; 552 553 dmp = VFSTODEVFS(mp); 554 if (de->de_flags & DE_DOOMED) { 555 sx_xunlock(&dmp->dm_lock); 556 return (ENOENT); 557 } 558 loop: 559 DEVFS_DE_HOLD(de); 560 DEVFS_DMP_HOLD(dmp); 561 mtx_lock(&devfs_de_interlock); 562 vp = de->de_vnode; 563 if (vp != NULL) { 564 vs = vget_prep(vp); 565 mtx_unlock(&devfs_de_interlock); 566 sx_xunlock(&dmp->dm_lock); 567 vget_finish(vp, lockmode | LK_RETRY, vs); 568 sx_xlock(&dmp->dm_lock); 569 if (devfs_allocv_drop_refs(0, dmp, de)) { 570 vput(vp); 571 return (ENOENT); 572 } else if (VN_IS_DOOMED(vp)) { 573 mtx_lock(&devfs_de_interlock); 574 if (de->de_vnode == vp) { 575 de->de_vnode = NULL; 576 vp->v_data = NULL; 577 } 578 mtx_unlock(&devfs_de_interlock); 579 vput(vp); 580 goto loop; 581 } 582 sx_xunlock(&dmp->dm_lock); 583 *vpp = vp; 584 return (0); 585 } 586 mtx_unlock(&devfs_de_interlock); 587 if (de->de_dirent->d_type == DT_CHR) { 588 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { 589 devfs_allocv_drop_refs(1, dmp, de); 590 return (ENOENT); 591 } 592 dev = &de->de_cdp->cdp_c; 593 } else { 594 dev = NULL; 595 } 596 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 597 if (error != 0) { 598 devfs_allocv_drop_refs(1, dmp, de); 599 printf("devfs_allocv: failed to allocate new vnode\n"); 600 return (error); 601 } 602 603 if (de->de_dirent->d_type == DT_CHR) { 604 vp->v_type = VCHR; 605 VI_LOCK(vp); 606 dev_lock(); 607 dev_refl(dev); 608 /* XXX: v_rdev should be protect by vnode lock */ 609 vp->v_rdev = dev; 610 VNPASS(vp->v_usecount == 1, vp); 611 /* Special casing of ttys for deadfs. Probably redundant. */ 612 dsw = dev->si_devsw; 613 if (dsw != NULL && (dsw->d_flags & D_TTY) != 0) 614 vp->v_vflag |= VV_ISTTY; 615 dev_unlock(); 616 VI_UNLOCK(vp); 617 if ((dev->si_flags & SI_ETERNAL) != 0) 618 vp->v_vflag |= VV_ETERNALDEV; 619 vp->v_op = &devfs_specops; 620 } else if (de->de_dirent->d_type == DT_DIR) { 621 vp->v_type = VDIR; 622 } else if (de->de_dirent->d_type == DT_LNK) { 623 vp->v_type = VLNK; 624 } else { 625 vp->v_type = VBAD; 626 } 627 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS); 628 VN_LOCK_ASHARE(vp); 629 mtx_lock(&devfs_de_interlock); 630 vp->v_data = de; 631 de->de_vnode = vp; 632 mtx_unlock(&devfs_de_interlock); 633 error = insmntque1(vp, mp); 634 if (error != 0) { 635 mtx_lock(&devfs_de_interlock); 636 vp->v_data = NULL; 637 de->de_vnode = NULL; 638 mtx_unlock(&devfs_de_interlock); 639 vgone(vp); 640 vput(vp); 641 (void) devfs_allocv_drop_refs(1, dmp, de); 642 return (error); 643 } 644 if (devfs_allocv_drop_refs(0, dmp, de)) { 645 vgone(vp); 646 vput(vp); 647 return (ENOENT); 648 } 649 #ifdef MAC 650 mac_devfs_vnode_associate(mp, de, vp); 651 #endif 652 sx_xunlock(&dmp->dm_lock); 653 vn_set_state(vp, VSTATE_CONSTRUCTED); 654 *vpp = vp; 655 return (0); 656 } 657 658 static int 659 devfs_access(struct vop_access_args *ap) 660 { 661 struct vnode *vp = ap->a_vp; 662 struct devfs_dirent *de; 663 struct proc *p; 664 int error; 665 666 de = vp->v_data; 667 if (vp->v_type == VDIR) 668 de = de->de_dir; 669 670 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 671 ap->a_accmode, ap->a_cred); 672 if (error == 0) 673 return (0); 674 if (error != EACCES) 675 return (error); 676 p = ap->a_td->td_proc; 677 /* We do, however, allow access to the controlling terminal */ 678 PROC_LOCK(p); 679 if (!(p->p_flag & P_CONTROLT)) { 680 PROC_UNLOCK(p); 681 return (error); 682 } 683 if (p->p_session->s_ttydp == de->de_cdp) 684 error = 0; 685 PROC_UNLOCK(p); 686 return (error); 687 } 688 689 _Static_assert(((FMASK | FCNTLFLAGS) & (FLASTCLOSE | FREVOKE)) == 0, 690 "devfs-only flag reuse failed"); 691 692 static int 693 devfs_close(struct vop_close_args *ap) 694 { 695 struct vnode *vp = ap->a_vp, *oldvp; 696 struct thread *td = ap->a_td; 697 struct proc *p; 698 struct cdev *dev = vp->v_rdev; 699 struct cdevsw *dsw; 700 struct devfs_dirent *de = vp->v_data; 701 int dflags, error, ref, vp_locked; 702 703 /* 704 * XXX: Don't call d_close() if we were called because of 705 * XXX: insmntque() failure. 706 */ 707 if (vp->v_data == NULL) 708 return (0); 709 710 /* 711 * Hack: a tty device that is a controlling terminal 712 * has a reference from the session structure. 713 * We cannot easily tell that a character device is 714 * a controlling terminal, unless it is the closing 715 * process' controlling terminal. In that case, 716 * if the reference count is 2 (this last descriptor 717 * plus the session), release the reference from the session. 718 */ 719 if (de->de_usecount == 2 && td != NULL) { 720 p = td->td_proc; 721 PROC_LOCK(p); 722 if (vp == p->p_session->s_ttyvp) { 723 PROC_UNLOCK(p); 724 oldvp = NULL; 725 sx_xlock(&proctree_lock); 726 if (vp == p->p_session->s_ttyvp) { 727 SESS_LOCK(p->p_session); 728 mtx_lock(&devfs_de_interlock); 729 VI_LOCK(vp); 730 if (devfs_usecountl(vp) == 2 && !VN_IS_DOOMED(vp)) { 731 p->p_session->s_ttyvp = NULL; 732 p->p_session->s_ttydp = NULL; 733 oldvp = vp; 734 } 735 VI_UNLOCK(vp); 736 mtx_unlock(&devfs_de_interlock); 737 SESS_UNLOCK(p->p_session); 738 } 739 sx_xunlock(&proctree_lock); 740 if (oldvp != NULL) 741 devfs_ctty_unref(oldvp); 742 } else 743 PROC_UNLOCK(p); 744 } 745 /* 746 * We do not want to really close the device if it 747 * is still in use unless we are trying to close it 748 * forcibly. Since every use (buffer, vnode, swap, cmap) 749 * holds a reference to the vnode, and because we mark 750 * any other vnodes that alias this device, when the 751 * sum of the reference counts on all the aliased 752 * vnodes descends to one, we are on last close. 753 */ 754 dsw = dev_refthread(dev, &ref); 755 if (dsw == NULL) 756 return (ENXIO); 757 dflags = 0; 758 mtx_lock(&devfs_de_interlock); 759 VI_LOCK(vp); 760 if (devfs_usecountl(vp) == 1) 761 dflags |= FLASTCLOSE; 762 devfs_usecount_subl(vp); 763 mtx_unlock(&devfs_de_interlock); 764 if (VN_IS_DOOMED(vp)) { 765 /* Forced close. */ 766 dflags |= FREVOKE | FNONBLOCK; 767 } else if (dsw->d_flags & D_TRACKCLOSE) { 768 /* Keep device updated on status. */ 769 } else if ((dflags & FLASTCLOSE) == 0) { 770 VI_UNLOCK(vp); 771 dev_relthread(dev, ref); 772 return (0); 773 } 774 vholdnz(vp); 775 VI_UNLOCK(vp); 776 vp_locked = VOP_ISLOCKED(vp); 777 VOP_UNLOCK(vp); 778 KASSERT(dev->si_refcount > 0, 779 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 780 error = dsw->d_close(dev, ap->a_fflag | dflags, S_IFCHR, td); 781 dev_relthread(dev, ref); 782 vn_lock(vp, vp_locked | LK_RETRY); 783 vdrop(vp); 784 return (error); 785 } 786 787 static int 788 devfs_close_f(struct file *fp, struct thread *td) 789 { 790 int error; 791 struct file *fpop; 792 793 /* 794 * NB: td may be NULL if this descriptor is closed due to 795 * garbage collection from a closed UNIX domain socket. 796 */ 797 fpop = curthread->td_fpop; 798 curthread->td_fpop = fp; 799 error = vnops.fo_close(fp, td); 800 curthread->td_fpop = fpop; 801 802 /* 803 * The f_cdevpriv cannot be assigned non-NULL value while we 804 * are destroying the file. 805 */ 806 if (fp->f_cdevpriv != NULL) 807 devfs_fpdrop(fp); 808 return (error); 809 } 810 811 static int 812 devfs_getattr(struct vop_getattr_args *ap) 813 { 814 struct vnode *vp = ap->a_vp; 815 struct vattr *vap = ap->a_vap; 816 struct devfs_dirent *de; 817 struct devfs_mount *dmp; 818 struct cdev *dev; 819 struct timeval boottime; 820 int error; 821 822 error = devfs_populate_vp(vp); 823 if (error != 0) 824 return (error); 825 826 dmp = VFSTODEVFS(vp->v_mount); 827 sx_xunlock(&dmp->dm_lock); 828 829 de = vp->v_data; 830 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 831 if (vp->v_type == VDIR) { 832 de = de->de_dir; 833 KASSERT(de != NULL, 834 ("Null dir dirent in devfs_getattr vp=%p", vp)); 835 } 836 vap->va_uid = de->de_uid; 837 vap->va_gid = de->de_gid; 838 vap->va_mode = de->de_mode; 839 if (vp->v_type == VLNK) 840 vap->va_size = strlen(de->de_symlink); 841 else if (vp->v_type == VDIR) 842 vap->va_size = vap->va_bytes = DEV_BSIZE; 843 else 844 vap->va_size = 0; 845 if (vp->v_type != VDIR) 846 vap->va_bytes = 0; 847 vap->va_blocksize = DEV_BSIZE; 848 vap->va_type = vp->v_type; 849 850 getboottime(&boottime); 851 #define fix(aa) \ 852 do { \ 853 if ((aa).tv_sec <= 3600) { \ 854 (aa).tv_sec = boottime.tv_sec; \ 855 (aa).tv_nsec = boottime.tv_usec * 1000; \ 856 } \ 857 } while (0) 858 859 if (vp->v_type != VCHR) { 860 fix(de->de_atime); 861 vap->va_atime = de->de_atime; 862 fix(de->de_mtime); 863 vap->va_mtime = de->de_mtime; 864 fix(de->de_ctime); 865 vap->va_ctime = de->de_ctime; 866 } else { 867 dev = vp->v_rdev; 868 fix(dev->si_atime); 869 vap->va_atime = dev->si_atime; 870 fix(dev->si_mtime); 871 vap->va_mtime = dev->si_mtime; 872 fix(dev->si_ctime); 873 vap->va_ctime = dev->si_ctime; 874 875 vap->va_rdev = cdev2priv(dev)->cdp_inode; 876 } 877 vap->va_gen = 0; 878 vap->va_flags = 0; 879 vap->va_filerev = 0; 880 vap->va_nlink = de->de_links; 881 vap->va_fileid = de->de_inode; 882 883 return (error); 884 } 885 886 /* ARGSUSED */ 887 static int 888 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 889 { 890 struct file *fpop; 891 int error; 892 893 fpop = td->td_fpop; 894 td->td_fpop = fp; 895 error = vnops.fo_ioctl(fp, com, data, cred, td); 896 td->td_fpop = fpop; 897 return (error); 898 } 899 900 void * 901 fiodgname_buf_get_ptr(void *fgnp, u_long com) 902 { 903 union { 904 struct fiodgname_arg fgn; 905 #ifdef COMPAT_FREEBSD32 906 struct fiodgname_arg32 fgn32; 907 #endif 908 } *fgnup; 909 910 fgnup = fgnp; 911 switch (com) { 912 case FIODGNAME: 913 return (fgnup->fgn.buf); 914 #ifdef COMPAT_FREEBSD32 915 case FIODGNAME_32: 916 return ((void *)(uintptr_t)fgnup->fgn32.buf); 917 #endif 918 default: 919 panic("Unhandled ioctl command %ld", com); 920 } 921 } 922 923 static int 924 devfs_ioctl(struct vop_ioctl_args *ap) 925 { 926 struct fiodgname_arg *fgn; 927 struct vnode *vpold, *vp; 928 struct cdevsw *dsw; 929 struct thread *td; 930 struct session *sess; 931 struct cdev *dev; 932 int error, ref, i; 933 const char *p; 934 u_long com; 935 936 vp = ap->a_vp; 937 com = ap->a_command; 938 td = ap->a_td; 939 940 dsw = devvn_refthread(vp, &dev, &ref); 941 if (dsw == NULL) 942 return (ENXIO); 943 KASSERT(dev->si_refcount > 0, 944 ("devfs: un-referenced struct cdev *(%s)", devtoname(dev))); 945 946 switch (com) { 947 case FIODTYPE: 948 *(int *)ap->a_data = dsw->d_flags & D_TYPEMASK; 949 error = 0; 950 break; 951 case FIODGNAME: 952 #ifdef COMPAT_FREEBSD32 953 case FIODGNAME_32: 954 #endif 955 fgn = ap->a_data; 956 p = devtoname(dev); 957 i = strlen(p) + 1; 958 if (i > fgn->len) 959 error = EINVAL; 960 else 961 error = copyout(p, fiodgname_buf_get_ptr(fgn, com), i); 962 break; 963 default: 964 error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td); 965 } 966 967 dev_relthread(dev, ref); 968 if (error == ENOIOCTL) 969 error = ENOTTY; 970 971 if (error == 0 && com == TIOCSCTTY) { 972 /* 973 * Do nothing if reassigning same control tty, or if the 974 * control tty has already disappeared. If it disappeared, 975 * it's because we were racing with TIOCNOTTY. TIOCNOTTY 976 * already took care of releasing the old vnode and we have 977 * nothing left to do. 978 */ 979 sx_slock(&proctree_lock); 980 sess = td->td_proc->p_session; 981 if (sess->s_ttyvp == vp || sess->s_ttyp == NULL) { 982 sx_sunlock(&proctree_lock); 983 return (0); 984 } 985 986 devfs_ctty_ref(vp); 987 SESS_LOCK(sess); 988 vpold = sess->s_ttyvp; 989 sess->s_ttyvp = vp; 990 sess->s_ttydp = cdev2priv(dev); 991 SESS_UNLOCK(sess); 992 993 sx_sunlock(&proctree_lock); 994 995 /* Get rid of reference to old control tty */ 996 if (vpold) 997 devfs_ctty_unref(vpold); 998 } 999 return (error); 1000 } 1001 1002 /* ARGSUSED */ 1003 static int 1004 devfs_kqfilter_f(struct file *fp, struct knote *kn) 1005 { 1006 struct cdev *dev; 1007 struct cdevsw *dsw; 1008 int error, ref; 1009 struct file *fpop; 1010 struct thread *td; 1011 1012 td = curthread; 1013 fpop = td->td_fpop; 1014 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1015 if (error) 1016 return (error); 1017 error = dsw->d_kqfilter(dev, kn); 1018 td->td_fpop = fpop; 1019 dev_relthread(dev, ref); 1020 return (error); 1021 } 1022 1023 static inline int 1024 devfs_prison_check(struct devfs_dirent *de, struct thread *td) 1025 { 1026 struct cdev_priv *cdp; 1027 struct ucred *dcr; 1028 struct proc *p; 1029 int error; 1030 1031 cdp = de->de_cdp; 1032 if (cdp == NULL) 1033 return (0); 1034 dcr = cdp->cdp_c.si_cred; 1035 if (dcr == NULL) 1036 return (0); 1037 1038 error = prison_check(td->td_ucred, dcr); 1039 if (error == 0) 1040 return (0); 1041 /* We do, however, allow access to the controlling terminal */ 1042 p = td->td_proc; 1043 PROC_LOCK(p); 1044 if (!(p->p_flag & P_CONTROLT)) { 1045 PROC_UNLOCK(p); 1046 return (error); 1047 } 1048 if (p->p_session->s_ttydp == cdp) 1049 error = 0; 1050 PROC_UNLOCK(p); 1051 return (error); 1052 } 1053 1054 static int 1055 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 1056 { 1057 struct componentname *cnp; 1058 struct vnode *dvp, **vpp; 1059 struct thread *td; 1060 struct devfs_dirent *de, *dd; 1061 struct devfs_dirent **dde; 1062 struct devfs_mount *dmp; 1063 struct mount *mp; 1064 struct cdev *cdev; 1065 int error, flags, nameiop, dvplocked; 1066 char specname[SPECNAMELEN + 1], *pname; 1067 1068 td = curthread; 1069 cnp = ap->a_cnp; 1070 vpp = ap->a_vpp; 1071 dvp = ap->a_dvp; 1072 pname = cnp->cn_nameptr; 1073 flags = cnp->cn_flags; 1074 nameiop = cnp->cn_nameiop; 1075 mp = dvp->v_mount; 1076 dmp = VFSTODEVFS(mp); 1077 dd = dvp->v_data; 1078 *vpp = NULL; 1079 1080 if ((flags & ISLASTCN) && nameiop == RENAME) 1081 return (EOPNOTSUPP); 1082 1083 if (dvp->v_type != VDIR) 1084 return (ENOTDIR); 1085 1086 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 1087 return (EIO); 1088 1089 error = vn_dir_check_exec(dvp, cnp); 1090 if (error != 0) 1091 return (error); 1092 1093 if (cnp->cn_namelen == 1 && *pname == '.') { 1094 if ((flags & ISLASTCN) && nameiop != LOOKUP) 1095 return (EINVAL); 1096 *vpp = dvp; 1097 vref(dvp); 1098 return (0); 1099 } 1100 1101 if (flags & ISDOTDOT) { 1102 if ((flags & ISLASTCN) && nameiop != LOOKUP) 1103 return (EINVAL); 1104 de = devfs_parent_dirent(dd); 1105 if (de == NULL) 1106 return (ENOENT); 1107 dvplocked = VOP_ISLOCKED(dvp); 1108 VOP_UNLOCK(dvp); 1109 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, 1110 vpp); 1111 *dm_unlock = 0; 1112 vn_lock(dvp, dvplocked | LK_RETRY); 1113 return (error); 1114 } 1115 1116 dd = dvp->v_data; 1117 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0); 1118 while (de == NULL) { /* While(...) so we can use break */ 1119 1120 if (nameiop == DELETE) 1121 return (ENOENT); 1122 1123 /* 1124 * OK, we didn't have an entry for the name we were asked for 1125 * so we try to see if anybody can create it on demand. 1126 */ 1127 pname = devfs_fqpn(specname, dmp, dd, cnp); 1128 if (pname == NULL) 1129 break; 1130 1131 cdev = NULL; 1132 DEVFS_DMP_HOLD(dmp); 1133 sx_xunlock(&dmp->dm_lock); 1134 dvplocked = VOP_ISLOCKED(dvp); 1135 1136 /* 1137 * Invoke the dev_clone handler. Unlock dvp around it 1138 * to simplify the cloner operations. 1139 * 1140 * If dvp is reclaimed while we unlocked it, we return 1141 * with ENOENT by some of the paths below. If cloner 1142 * returned cdev, then devfs_populate_vp() notes the 1143 * reclamation. Otherwise, note that either our devfs 1144 * mount is being unmounted, then DEVFS_DMP_DROP() 1145 * returns true, and we return ENOENT this way. Or, 1146 * because de == NULL, the check for it after the loop 1147 * returns ENOENT. 1148 */ 1149 VOP_UNLOCK(dvp); 1150 EVENTHANDLER_INVOKE(dev_clone, 1151 td->td_ucred, pname, strlen(pname), &cdev); 1152 vn_lock(dvp, dvplocked | LK_RETRY); 1153 1154 if (cdev == NULL) 1155 sx_xlock(&dmp->dm_lock); 1156 else if (devfs_populate_vp(dvp) != 0) { 1157 *dm_unlock = 0; 1158 sx_xlock(&dmp->dm_lock); 1159 if (DEVFS_DMP_DROP(dmp)) { 1160 sx_xunlock(&dmp->dm_lock); 1161 devfs_unmount_final(dmp); 1162 } else 1163 sx_xunlock(&dmp->dm_lock); 1164 dev_rel(cdev); 1165 return (ENOENT); 1166 } 1167 if (DEVFS_DMP_DROP(dmp)) { 1168 *dm_unlock = 0; 1169 sx_xunlock(&dmp->dm_lock); 1170 devfs_unmount_final(dmp); 1171 if (cdev != NULL) 1172 dev_rel(cdev); 1173 return (ENOENT); 1174 } 1175 1176 if (cdev == NULL) 1177 break; 1178 1179 dev_lock(); 1180 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx]; 1181 if (dde != NULL && *dde != NULL) 1182 de = *dde; 1183 dev_unlock(); 1184 dev_rel(cdev); 1185 break; 1186 } 1187 1188 if (de == NULL || de->de_flags & DE_WHITEOUT) { 1189 if ((nameiop == CREATE || nameiop == RENAME) && 1190 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 1191 return (EJUSTRETURN); 1192 } 1193 return (ENOENT); 1194 } 1195 1196 if (devfs_prison_check(de, td)) 1197 return (ENOENT); 1198 1199 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 1200 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 1201 if (error) 1202 return (error); 1203 if (*vpp == dvp) { 1204 vref(dvp); 1205 *vpp = dvp; 1206 return (0); 1207 } 1208 } 1209 error = devfs_allocv(de, mp, cnp->cn_lkflags & LK_TYPE_MASK, vpp); 1210 *dm_unlock = 0; 1211 return (error); 1212 } 1213 1214 static int 1215 devfs_lookup(struct vop_lookup_args *ap) 1216 { 1217 int j; 1218 struct devfs_mount *dmp; 1219 int dm_unlock; 1220 1221 if (devfs_populate_vp(ap->a_dvp) != 0) 1222 return (ENOTDIR); 1223 1224 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1225 dm_unlock = 1; 1226 j = devfs_lookupx(ap, &dm_unlock); 1227 if (dm_unlock == 1) 1228 sx_xunlock(&dmp->dm_lock); 1229 return (j); 1230 } 1231 1232 static int 1233 devfs_mknod(struct vop_mknod_args *ap) 1234 { 1235 struct componentname *cnp; 1236 struct vnode *dvp, **vpp; 1237 struct devfs_dirent *dd, *de; 1238 struct devfs_mount *dmp; 1239 int error; 1240 1241 /* 1242 * The only type of node we should be creating here is a 1243 * character device, for anything else return EOPNOTSUPP. 1244 */ 1245 if (ap->a_vap->va_type != VCHR) 1246 return (EOPNOTSUPP); 1247 dvp = ap->a_dvp; 1248 dmp = VFSTODEVFS(dvp->v_mount); 1249 1250 cnp = ap->a_cnp; 1251 vpp = ap->a_vpp; 1252 dd = dvp->v_data; 1253 1254 error = ENOENT; 1255 sx_xlock(&dmp->dm_lock); 1256 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 1257 if (cnp->cn_namelen != de->de_dirent->d_namlen) 1258 continue; 1259 if (de->de_dirent->d_type == DT_CHR && 1260 (de->de_cdp->cdp_flags & CDP_ACTIVE) == 0) 1261 continue; 1262 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 1263 de->de_dirent->d_namlen) != 0) 1264 continue; 1265 if (de->de_flags & DE_WHITEOUT) 1266 break; 1267 goto notfound; 1268 } 1269 if (de == NULL) 1270 goto notfound; 1271 de->de_flags &= ~DE_WHITEOUT; 1272 error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp); 1273 return (error); 1274 notfound: 1275 sx_xunlock(&dmp->dm_lock); 1276 return (error); 1277 } 1278 1279 /* ARGSUSED */ 1280 static int 1281 devfs_open(struct vop_open_args *ap) 1282 { 1283 struct thread *td = ap->a_td; 1284 struct vnode *vp = ap->a_vp; 1285 struct cdev *dev = vp->v_rdev; 1286 struct file *fp = ap->a_fp; 1287 int error, ref, vlocked; 1288 struct cdevsw *dsw; 1289 struct file *fpop; 1290 1291 if (vp->v_type == VBLK) 1292 return (ENXIO); 1293 1294 if (dev == NULL) 1295 return (ENXIO); 1296 1297 /* Make this field valid before any I/O in d_open. */ 1298 if (dev->si_iosize_max == 0) 1299 dev->si_iosize_max = DFLTPHYS; 1300 1301 dsw = dev_refthread(dev, &ref); 1302 if (dsw == NULL) 1303 return (ENXIO); 1304 if (fp == NULL && dsw->d_fdopen != NULL) { 1305 dev_relthread(dev, ref); 1306 return (ENXIO); 1307 } 1308 1309 if (vp->v_type == VCHR) 1310 devfs_usecount_add(vp); 1311 1312 vlocked = VOP_ISLOCKED(vp); 1313 VOP_UNLOCK(vp); 1314 1315 fpop = td->td_fpop; 1316 td->td_fpop = fp; 1317 if (fp != NULL) { 1318 fp->f_data = dev; 1319 fp->f_vnode = vp; 1320 } 1321 if (dsw->d_fdopen != NULL) 1322 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 1323 else 1324 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 1325 /* Clean up any cdevpriv upon error. */ 1326 if (error != 0) 1327 devfs_clear_cdevpriv(); 1328 td->td_fpop = fpop; 1329 1330 vn_lock(vp, vlocked | LK_RETRY); 1331 if (error != 0 && vp->v_type == VCHR) 1332 devfs_usecount_sub(vp); 1333 1334 dev_relthread(dev, ref); 1335 if (error != 0) { 1336 if (error == ERESTART) 1337 error = EINTR; 1338 return (error); 1339 } 1340 1341 #if 0 /* /dev/console */ 1342 KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp")); 1343 #else 1344 if (fp == NULL) 1345 return (error); 1346 #endif 1347 if (fp->f_ops == &badfileops) 1348 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f); 1349 return (error); 1350 } 1351 1352 static int 1353 devfs_pathconf(struct vop_pathconf_args *ap) 1354 { 1355 1356 switch (ap->a_name) { 1357 case _PC_FILESIZEBITS: 1358 *ap->a_retval = 64; 1359 return (0); 1360 case _PC_NAME_MAX: 1361 *ap->a_retval = NAME_MAX; 1362 return (0); 1363 case _PC_LINK_MAX: 1364 *ap->a_retval = INT_MAX; 1365 return (0); 1366 case _PC_SYMLINK_MAX: 1367 *ap->a_retval = MAXPATHLEN; 1368 return (0); 1369 case _PC_MAX_CANON: 1370 if (ap->a_vp->v_vflag & VV_ISTTY) { 1371 *ap->a_retval = MAX_CANON; 1372 return (0); 1373 } 1374 return (EINVAL); 1375 case _PC_MAX_INPUT: 1376 if (ap->a_vp->v_vflag & VV_ISTTY) { 1377 *ap->a_retval = MAX_INPUT; 1378 return (0); 1379 } 1380 return (EINVAL); 1381 case _PC_VDISABLE: 1382 if (ap->a_vp->v_vflag & VV_ISTTY) { 1383 *ap->a_retval = _POSIX_VDISABLE; 1384 return (0); 1385 } 1386 return (EINVAL); 1387 case _PC_MAC_PRESENT: 1388 #ifdef MAC 1389 /* 1390 * If MAC is enabled, devfs automatically supports 1391 * trivial non-persistent label storage. 1392 */ 1393 *ap->a_retval = 1; 1394 #else 1395 *ap->a_retval = 0; 1396 #endif 1397 return (0); 1398 case _PC_CHOWN_RESTRICTED: 1399 *ap->a_retval = 1; 1400 return (0); 1401 default: 1402 return (vop_stdpathconf(ap)); 1403 } 1404 /* NOTREACHED */ 1405 } 1406 1407 /* ARGSUSED */ 1408 static int 1409 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 1410 { 1411 struct cdev *dev; 1412 struct cdevsw *dsw; 1413 int error, ref; 1414 struct file *fpop; 1415 1416 fpop = td->td_fpop; 1417 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1418 if (error != 0) { 1419 error = vnops.fo_poll(fp, events, cred, td); 1420 return (error); 1421 } 1422 error = dsw->d_poll(dev, events, td); 1423 td->td_fpop = fpop; 1424 dev_relthread(dev, ref); 1425 return(error); 1426 } 1427 1428 /* 1429 * Print out the contents of a special device vnode. 1430 */ 1431 static int 1432 devfs_print(struct vop_print_args *ap) 1433 { 1434 1435 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 1436 return (0); 1437 } 1438 1439 static int 1440 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, 1441 int flags, struct thread *td) 1442 { 1443 struct cdev *dev; 1444 int ioflag, error, ref; 1445 ssize_t resid; 1446 struct cdevsw *dsw; 1447 struct file *fpop; 1448 1449 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1450 return (EINVAL); 1451 fpop = td->td_fpop; 1452 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1453 if (error != 0) { 1454 error = vnops.fo_read(fp, uio, cred, flags, td); 1455 return (error); 1456 } 1457 resid = uio->uio_resid; 1458 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 1459 if (ioflag & O_DIRECT) 1460 ioflag |= IO_DIRECT; 1461 1462 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1463 error = dsw->d_read(dev, uio, ioflag); 1464 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 1465 devfs_timestamp(&dev->si_atime); 1466 td->td_fpop = fpop; 1467 dev_relthread(dev, ref); 1468 1469 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_R); 1470 return (error); 1471 } 1472 1473 static int 1474 devfs_readdir(struct vop_readdir_args *ap) 1475 { 1476 int error; 1477 struct uio *uio; 1478 struct dirent *dp; 1479 struct devfs_dirent *dd; 1480 struct devfs_dirent *de; 1481 struct devfs_mount *dmp; 1482 off_t off; 1483 int *tmp_ncookies = NULL; 1484 ssize_t startresid; 1485 1486 if (ap->a_vp->v_type != VDIR) 1487 return (ENOTDIR); 1488 1489 uio = ap->a_uio; 1490 if (uio->uio_offset < 0) 1491 return (EINVAL); 1492 1493 /* 1494 * XXX: This is a temporary hack to get around this filesystem not 1495 * supporting cookies. We store the location of the ncookies pointer 1496 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 1497 * and set the number of cookies to 0. We then set the pointer to 1498 * NULL so that vfs_read_dirent doesn't try to call realloc() on 1499 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 1500 * pointer to its original location before returning to the caller. 1501 */ 1502 if (ap->a_ncookies != NULL) { 1503 tmp_ncookies = ap->a_ncookies; 1504 *ap->a_ncookies = 0; 1505 ap->a_ncookies = NULL; 1506 } 1507 1508 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1509 if (devfs_populate_vp(ap->a_vp) != 0) { 1510 if (tmp_ncookies != NULL) 1511 ap->a_ncookies = tmp_ncookies; 1512 return (EIO); 1513 } 1514 error = 0; 1515 de = ap->a_vp->v_data; 1516 off = 0; 1517 startresid = uio->uio_resid; 1518 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 1519 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 1520 if (dd->de_flags & (DE_COVERED | DE_WHITEOUT)) 1521 continue; 1522 if (devfs_prison_check(dd, uio->uio_td)) 1523 continue; 1524 if (dd->de_dirent->d_type == DT_DIR) 1525 de = dd->de_dir; 1526 else 1527 de = dd; 1528 dp = dd->de_dirent; 1529 MPASS(dp->d_reclen == GENERIC_DIRSIZ(dp)); 1530 if (dp->d_reclen > uio->uio_resid) { 1531 /* Nothing was copied out, return EINVAL. */ 1532 if (uio->uio_resid == startresid) 1533 error = EINVAL; 1534 /* Otherwise stop. */ 1535 break; 1536 } 1537 dp->d_fileno = de->de_inode; 1538 /* NOTE: d_off is the offset for the *next* entry. */ 1539 dp->d_off = off + dp->d_reclen; 1540 if (off >= uio->uio_offset) { 1541 error = vfs_read_dirent(ap, dp, off); 1542 if (error) 1543 break; 1544 } 1545 off += dp->d_reclen; 1546 } 1547 sx_xunlock(&dmp->dm_lock); 1548 uio->uio_offset = off; 1549 1550 /* 1551 * Restore ap->a_ncookies if it wasn't originally NULL in the first 1552 * place. 1553 */ 1554 if (tmp_ncookies != NULL) 1555 ap->a_ncookies = tmp_ncookies; 1556 if (dd == NULL && error == 0 && ap->a_eofflag != NULL) 1557 *ap->a_eofflag = 1; 1558 1559 return (error); 1560 } 1561 1562 static int 1563 devfs_readlink(struct vop_readlink_args *ap) 1564 { 1565 struct devfs_dirent *de; 1566 1567 de = ap->a_vp->v_data; 1568 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 1569 } 1570 1571 static void 1572 devfs_reclaiml(struct vnode *vp) 1573 { 1574 struct devfs_dirent *de; 1575 1576 mtx_assert(&devfs_de_interlock, MA_OWNED); 1577 de = vp->v_data; 1578 if (de != NULL) { 1579 MPASS(de->de_usecount == 0); 1580 de->de_vnode = NULL; 1581 vp->v_data = NULL; 1582 } 1583 } 1584 1585 static int 1586 devfs_reclaim(struct vop_reclaim_args *ap) 1587 { 1588 struct vnode *vp; 1589 1590 vp = ap->a_vp; 1591 mtx_lock(&devfs_de_interlock); 1592 devfs_reclaiml(vp); 1593 mtx_unlock(&devfs_de_interlock); 1594 return (0); 1595 } 1596 1597 static int 1598 devfs_reclaim_vchr(struct vop_reclaim_args *ap) 1599 { 1600 struct vnode *vp; 1601 struct cdev *dev; 1602 1603 vp = ap->a_vp; 1604 MPASS(vp->v_type == VCHR); 1605 1606 mtx_lock(&devfs_de_interlock); 1607 VI_LOCK(vp); 1608 devfs_usecount_subl(vp); 1609 devfs_reclaiml(vp); 1610 mtx_unlock(&devfs_de_interlock); 1611 dev_lock(); 1612 dev = vp->v_rdev; 1613 vp->v_rdev = NULL; 1614 dev_unlock(); 1615 VI_UNLOCK(vp); 1616 if (dev != NULL) 1617 dev_rel(dev); 1618 return (0); 1619 } 1620 1621 static int 1622 devfs_remove(struct vop_remove_args *ap) 1623 { 1624 struct vnode *dvp = ap->a_dvp; 1625 struct vnode *vp = ap->a_vp; 1626 struct devfs_dirent *dd; 1627 struct devfs_dirent *de, *de_covered; 1628 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1629 1630 ASSERT_VOP_ELOCKED(dvp, "devfs_remove"); 1631 ASSERT_VOP_ELOCKED(vp, "devfs_remove"); 1632 1633 sx_xlock(&dmp->dm_lock); 1634 dd = ap->a_dvp->v_data; 1635 de = vp->v_data; 1636 if (de->de_cdp == NULL) { 1637 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1638 if (de->de_dirent->d_type == DT_LNK) { 1639 de_covered = devfs_find(dd, de->de_dirent->d_name, 1640 de->de_dirent->d_namlen, 0); 1641 if (de_covered != NULL) 1642 de_covered->de_flags &= ~DE_COVERED; 1643 } 1644 /* We need to unlock dvp because devfs_delete() may lock it. */ 1645 VOP_UNLOCK(vp); 1646 if (dvp != vp) 1647 VOP_UNLOCK(dvp); 1648 devfs_delete(dmp, de, 0); 1649 sx_xunlock(&dmp->dm_lock); 1650 if (dvp != vp) 1651 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1652 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1653 } else { 1654 de->de_flags |= DE_WHITEOUT; 1655 sx_xunlock(&dmp->dm_lock); 1656 } 1657 return (0); 1658 } 1659 1660 /* 1661 * Revoke is called on a tty when a terminal session ends. The vnode 1662 * is orphaned by setting v_op to deadfs so we need to let go of it 1663 * as well so that we create a new one next time around. 1664 * 1665 */ 1666 static int 1667 devfs_revoke(struct vop_revoke_args *ap) 1668 { 1669 struct vnode *vp = ap->a_vp, *vp2; 1670 struct cdev *dev; 1671 struct cdev_priv *cdp; 1672 struct devfs_dirent *de; 1673 enum vgetstate vs; 1674 u_int i; 1675 1676 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1677 1678 dev = vp->v_rdev; 1679 cdp = cdev2priv(dev); 1680 1681 dev_lock(); 1682 cdp->cdp_inuse++; 1683 dev_unlock(); 1684 1685 vhold(vp); 1686 vgone(vp); 1687 vdrop(vp); 1688 1689 VOP_UNLOCK(vp); 1690 loop: 1691 for (;;) { 1692 mtx_lock(&devfs_de_interlock); 1693 dev_lock(); 1694 vp2 = NULL; 1695 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1696 de = cdp->cdp_dirents[i]; 1697 if (de == NULL) 1698 continue; 1699 1700 vp2 = de->de_vnode; 1701 if (vp2 != NULL) { 1702 dev_unlock(); 1703 vs = vget_prep(vp2); 1704 mtx_unlock(&devfs_de_interlock); 1705 if (vget_finish(vp2, LK_EXCLUSIVE, vs) != 0) 1706 goto loop; 1707 vhold(vp2); 1708 vgone(vp2); 1709 vdrop(vp2); 1710 vput(vp2); 1711 break; 1712 } 1713 } 1714 if (vp2 != NULL) { 1715 continue; 1716 } 1717 dev_unlock(); 1718 mtx_unlock(&devfs_de_interlock); 1719 break; 1720 } 1721 dev_lock(); 1722 cdp->cdp_inuse--; 1723 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1724 KASSERT((cdp->cdp_flags & CDP_ON_ACTIVE_LIST) != 0, 1725 ("%s: cdp %p (%s) not on active list", 1726 __func__, cdp, dev->si_name)); 1727 cdp->cdp_flags &= ~CDP_ON_ACTIVE_LIST; 1728 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1729 dev_unlock(); 1730 dev_rel(&cdp->cdp_c); 1731 } else 1732 dev_unlock(); 1733 1734 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1735 return (0); 1736 } 1737 1738 static int 1739 devfs_rioctl(struct vop_ioctl_args *ap) 1740 { 1741 struct vnode *vp; 1742 struct devfs_mount *dmp; 1743 int error; 1744 1745 vp = ap->a_vp; 1746 vn_lock(vp, LK_SHARED | LK_RETRY); 1747 if (VN_IS_DOOMED(vp)) { 1748 VOP_UNLOCK(vp); 1749 return (EBADF); 1750 } 1751 dmp = VFSTODEVFS(vp->v_mount); 1752 sx_xlock(&dmp->dm_lock); 1753 VOP_UNLOCK(vp); 1754 DEVFS_DMP_HOLD(dmp); 1755 devfs_populate(dmp); 1756 if (DEVFS_DMP_DROP(dmp)) { 1757 sx_xunlock(&dmp->dm_lock); 1758 devfs_unmount_final(dmp); 1759 return (ENOENT); 1760 } 1761 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1762 sx_xunlock(&dmp->dm_lock); 1763 return (error); 1764 } 1765 1766 static int 1767 devfs_rread(struct vop_read_args *ap) 1768 { 1769 1770 if (ap->a_vp->v_type != VDIR) 1771 return (EINVAL); 1772 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1773 } 1774 1775 static int 1776 devfs_setattr(struct vop_setattr_args *ap) 1777 { 1778 struct devfs_dirent *de; 1779 struct vattr *vap; 1780 struct vnode *vp; 1781 struct thread *td; 1782 int c, error; 1783 uid_t uid; 1784 gid_t gid; 1785 1786 vap = ap->a_vap; 1787 vp = ap->a_vp; 1788 td = curthread; 1789 if ((vap->va_type != VNON) || 1790 (vap->va_nlink != VNOVAL) || 1791 (vap->va_fsid != VNOVAL) || 1792 (vap->va_fileid != VNOVAL) || 1793 (vap->va_blocksize != VNOVAL) || 1794 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1795 (vap->va_rdev != VNOVAL) || 1796 ((int)vap->va_bytes != VNOVAL) || 1797 (vap->va_gen != VNOVAL)) { 1798 return (EINVAL); 1799 } 1800 1801 error = devfs_populate_vp(vp); 1802 if (error != 0) 1803 return (error); 1804 1805 de = vp->v_data; 1806 if (vp->v_type == VDIR) 1807 de = de->de_dir; 1808 1809 c = 0; 1810 if (vap->va_uid == (uid_t)VNOVAL) 1811 uid = de->de_uid; 1812 else 1813 uid = vap->va_uid; 1814 if (vap->va_gid == (gid_t)VNOVAL) 1815 gid = de->de_gid; 1816 else 1817 gid = vap->va_gid; 1818 if (uid != de->de_uid || gid != de->de_gid) { 1819 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1820 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1821 error = priv_check(td, PRIV_VFS_CHOWN); 1822 if (error != 0) 1823 goto ret; 1824 } 1825 de->de_uid = uid; 1826 de->de_gid = gid; 1827 c = 1; 1828 } 1829 1830 if (vap->va_mode != (mode_t)VNOVAL) { 1831 if (ap->a_cred->cr_uid != de->de_uid) { 1832 error = priv_check(td, PRIV_VFS_ADMIN); 1833 if (error != 0) 1834 goto ret; 1835 } 1836 de->de_mode = vap->va_mode; 1837 c = 1; 1838 } 1839 1840 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1841 error = vn_utimes_perm(vp, vap, ap->a_cred, td); 1842 if (error != 0) 1843 goto ret; 1844 if (vap->va_atime.tv_sec != VNOVAL) { 1845 if (vp->v_type == VCHR) 1846 vp->v_rdev->si_atime = vap->va_atime; 1847 else 1848 de->de_atime = vap->va_atime; 1849 } 1850 if (vap->va_mtime.tv_sec != VNOVAL) { 1851 if (vp->v_type == VCHR) 1852 vp->v_rdev->si_mtime = vap->va_mtime; 1853 else 1854 de->de_mtime = vap->va_mtime; 1855 } 1856 c = 1; 1857 } 1858 1859 if (c) { 1860 if (vp->v_type == VCHR) 1861 vfs_timestamp(&vp->v_rdev->si_ctime); 1862 else 1863 vfs_timestamp(&de->de_mtime); 1864 } 1865 1866 ret: 1867 sx_xunlock(&VFSTODEVFS(vp->v_mount)->dm_lock); 1868 return (error); 1869 } 1870 1871 #ifdef MAC 1872 static int 1873 devfs_setlabel(struct vop_setlabel_args *ap) 1874 { 1875 struct vnode *vp; 1876 struct devfs_dirent *de; 1877 1878 vp = ap->a_vp; 1879 de = vp->v_data; 1880 1881 mac_vnode_relabel(ap->a_cred, vp, ap->a_label); 1882 mac_devfs_update(vp->v_mount, de, vp); 1883 1884 return (0); 1885 } 1886 #endif 1887 1888 static int 1889 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred) 1890 { 1891 1892 return (vnops.fo_stat(fp, sb, cred)); 1893 } 1894 1895 static int 1896 devfs_symlink(struct vop_symlink_args *ap) 1897 { 1898 int i, error; 1899 struct devfs_dirent *dd; 1900 struct devfs_dirent *de, *de_covered, *de_dotdot; 1901 struct devfs_mount *dmp; 1902 1903 error = priv_check(curthread, PRIV_DEVFS_SYMLINK); 1904 if (error) 1905 return(error); 1906 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1907 if (devfs_populate_vp(ap->a_dvp) != 0) 1908 return (ENOENT); 1909 1910 dd = ap->a_dvp->v_data; 1911 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1912 de->de_flags = DE_USER; 1913 de->de_uid = 0; 1914 de->de_gid = 0; 1915 de->de_mode = 0755; 1916 de->de_inode = alloc_unr(devfs_inos); 1917 de->de_dir = dd; 1918 de->de_dirent->d_type = DT_LNK; 1919 i = strlen(ap->a_target) + 1; 1920 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1921 bcopy(ap->a_target, de->de_symlink, i); 1922 #ifdef MAC 1923 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1924 #endif 1925 de_covered = devfs_find(dd, de->de_dirent->d_name, 1926 de->de_dirent->d_namlen, 0); 1927 if (de_covered != NULL) { 1928 if ((de_covered->de_flags & DE_USER) != 0) { 1929 devfs_delete(dmp, de, DEVFS_DEL_NORECURSE); 1930 sx_xunlock(&dmp->dm_lock); 1931 return (EEXIST); 1932 } 1933 KASSERT((de_covered->de_flags & DE_COVERED) == 0, 1934 ("devfs_symlink: entry %p already covered", de_covered)); 1935 de_covered->de_flags |= DE_COVERED; 1936 } 1937 1938 de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */ 1939 de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */ 1940 TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list); 1941 devfs_dir_ref_de(dmp, dd); 1942 devfs_rules_apply(dmp, de); 1943 1944 return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp)); 1945 } 1946 1947 static int 1948 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) 1949 { 1950 1951 return (vnops.fo_truncate(fp, length, cred, td)); 1952 } 1953 1954 static int 1955 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, 1956 int flags, struct thread *td) 1957 { 1958 struct cdev *dev; 1959 int error, ioflag, ref; 1960 ssize_t resid; 1961 struct cdevsw *dsw; 1962 struct file *fpop; 1963 1964 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1965 return (EINVAL); 1966 fpop = td->td_fpop; 1967 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1968 if (error != 0) { 1969 error = vnops.fo_write(fp, uio, cred, flags, td); 1970 return (error); 1971 } 1972 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1973 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1974 if (ioflag & O_DIRECT) 1975 ioflag |= IO_DIRECT; 1976 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1977 1978 resid = uio->uio_resid; 1979 1980 error = dsw->d_write(dev, uio, ioflag); 1981 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1982 devfs_timestamp(&dev->si_ctime); 1983 dev->si_mtime = dev->si_ctime; 1984 } 1985 td->td_fpop = fpop; 1986 dev_relthread(dev, ref); 1987 1988 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_W); 1989 return (error); 1990 } 1991 1992 static int 1993 devfs_mmap_f(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size, 1994 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff, 1995 struct thread *td) 1996 { 1997 struct cdev *dev; 1998 struct cdevsw *dsw; 1999 struct mount *mp; 2000 struct vnode *vp; 2001 struct file *fpop; 2002 vm_object_t object; 2003 vm_prot_t maxprot; 2004 int error, ref; 2005 2006 vp = fp->f_vnode; 2007 2008 /* 2009 * Ensure that file and memory protections are 2010 * compatible. 2011 */ 2012 mp = vp->v_mount; 2013 if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0) { 2014 maxprot = VM_PROT_NONE; 2015 if ((prot & VM_PROT_EXECUTE) != 0) 2016 return (EACCES); 2017 } else 2018 maxprot = VM_PROT_EXECUTE; 2019 if ((fp->f_flag & FREAD) != 0) 2020 maxprot |= VM_PROT_READ; 2021 else if ((prot & VM_PROT_READ) != 0) 2022 return (EACCES); 2023 2024 /* 2025 * If we are sharing potential changes via MAP_SHARED and we 2026 * are trying to get write permission although we opened it 2027 * without asking for it, bail out. 2028 * 2029 * Note that most character devices always share mappings. 2030 * The one exception is that D_MMAP_ANON devices 2031 * (i.e. /dev/zero) permit private writable mappings. 2032 * 2033 * Rely on vm_mmap_cdev() to fail invalid MAP_PRIVATE requests 2034 * as well as updating maxprot to permit writing for 2035 * D_MMAP_ANON devices rather than doing that here. 2036 */ 2037 if ((flags & MAP_SHARED) != 0) { 2038 if ((fp->f_flag & FWRITE) != 0) 2039 maxprot |= VM_PROT_WRITE; 2040 else if ((prot & VM_PROT_WRITE) != 0) 2041 return (EACCES); 2042 } 2043 maxprot &= cap_maxprot; 2044 2045 fpop = td->td_fpop; 2046 error = devfs_fp_check(fp, &dev, &dsw, &ref); 2047 if (error != 0) 2048 return (error); 2049 2050 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, dev, dsw, &foff, 2051 &object); 2052 td->td_fpop = fpop; 2053 dev_relthread(dev, ref); 2054 if (error != 0) 2055 return (error); 2056 2057 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object, 2058 foff, FALSE, td); 2059 if (error != 0) 2060 vm_object_deallocate(object); 2061 return (error); 2062 } 2063 2064 dev_t 2065 dev2udev(struct cdev *x) 2066 { 2067 if (x == NULL) 2068 return (NODEV); 2069 return (cdev2priv(x)->cdp_inode); 2070 } 2071 2072 static int 2073 devfs_cmp_f(struct file *fp1, struct file *fp2, struct thread *td) 2074 { 2075 if (fp2->f_type != DTYPE_VNODE || fp2->f_ops != &devfs_ops_f) 2076 return (3); 2077 return (kcmp_cmp((uintptr_t)fp1->f_data, (uintptr_t)fp2->f_data)); 2078 } 2079 2080 static const struct fileops devfs_ops_f = { 2081 .fo_read = devfs_read_f, 2082 .fo_write = devfs_write_f, 2083 .fo_truncate = devfs_truncate_f, 2084 .fo_ioctl = devfs_ioctl_f, 2085 .fo_poll = devfs_poll_f, 2086 .fo_kqfilter = devfs_kqfilter_f, 2087 .fo_stat = devfs_stat_f, 2088 .fo_close = devfs_close_f, 2089 .fo_chmod = vn_chmod, 2090 .fo_chown = vn_chown, 2091 .fo_sendfile = vn_sendfile, 2092 .fo_seek = vn_seek, 2093 .fo_fill_kinfo = vn_fill_kinfo, 2094 .fo_mmap = devfs_mmap_f, 2095 .fo_cmp = devfs_cmp_f, 2096 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 2097 }; 2098 2099 /* Vops for non-CHR vnodes in /dev. */ 2100 static struct vop_vector devfs_vnodeops = { 2101 .vop_default = &default_vnodeops, 2102 2103 .vop_access = devfs_access, 2104 .vop_getattr = devfs_getattr, 2105 .vop_ioctl = devfs_rioctl, 2106 .vop_lookup = devfs_lookup, 2107 .vop_mknod = devfs_mknod, 2108 .vop_pathconf = devfs_pathconf, 2109 .vop_read = devfs_rread, 2110 .vop_readdir = devfs_readdir, 2111 .vop_readlink = devfs_readlink, 2112 .vop_reclaim = devfs_reclaim, 2113 .vop_remove = devfs_remove, 2114 .vop_revoke = devfs_revoke, 2115 .vop_setattr = devfs_setattr, 2116 #ifdef MAC 2117 .vop_setlabel = devfs_setlabel, 2118 #endif 2119 .vop_symlink = devfs_symlink, 2120 .vop_vptocnp = devfs_vptocnp, 2121 .vop_lock1 = vop_lock, 2122 .vop_unlock = vop_unlock, 2123 .vop_islocked = vop_islocked, 2124 .vop_add_writecount = vop_stdadd_writecount_nomsync, 2125 }; 2126 VFS_VOP_VECTOR_REGISTER(devfs_vnodeops); 2127 2128 /* Vops for VCHR vnodes in /dev. */ 2129 static struct vop_vector devfs_specops = { 2130 .vop_default = &default_vnodeops, 2131 2132 .vop_access = devfs_access, 2133 .vop_bmap = VOP_PANIC, 2134 .vop_close = devfs_close, 2135 .vop_create = VOP_PANIC, 2136 .vop_fsync = vop_stdfsync, 2137 .vop_getattr = devfs_getattr, 2138 .vop_ioctl = devfs_ioctl, 2139 .vop_link = VOP_PANIC, 2140 .vop_mkdir = VOP_PANIC, 2141 .vop_mknod = VOP_PANIC, 2142 .vop_open = devfs_open, 2143 .vop_pathconf = devfs_pathconf, 2144 .vop_poll = dead_poll, 2145 .vop_print = devfs_print, 2146 .vop_read = dead_read, 2147 .vop_readdir = VOP_PANIC, 2148 .vop_readlink = VOP_PANIC, 2149 .vop_reallocblks = VOP_PANIC, 2150 .vop_reclaim = devfs_reclaim_vchr, 2151 .vop_remove = devfs_remove, 2152 .vop_rename = VOP_PANIC, 2153 .vop_revoke = devfs_revoke, 2154 .vop_rmdir = VOP_PANIC, 2155 .vop_setattr = devfs_setattr, 2156 #ifdef MAC 2157 .vop_setlabel = devfs_setlabel, 2158 #endif 2159 .vop_strategy = VOP_PANIC, 2160 .vop_symlink = VOP_PANIC, 2161 .vop_vptocnp = devfs_vptocnp, 2162 .vop_write = dead_write, 2163 .vop_lock1 = vop_lock, 2164 .vop_unlock = vop_unlock, 2165 .vop_islocked = vop_islocked, 2166 .vop_add_writecount = vop_stdadd_writecount_nomsync, 2167 }; 2168 VFS_VOP_VECTOR_REGISTER(devfs_specops); 2169 2170 /* 2171 * Our calling convention to the device drivers used to be that we passed 2172 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 2173 * flags instead since that's what open(), close() and ioctl() takes and 2174 * we don't really want vnode.h in device drivers. 2175 * We solved the source compatibility by redefining some vnode flags to 2176 * be the same as the fcntl ones and by sending down the bitwise OR of 2177 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 2178 * pulls the rug out under this. 2179 */ 2180 CTASSERT(O_NONBLOCK == IO_NDELAY); 2181 CTASSERT(O_FSYNC == IO_SYNC); 2182