1 /*- 2 * Copyright (c) 2000-2004 3 * Poul-Henning Kamp. All rights reserved. 4 * Copyright (c) 1989, 1992-1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95 32 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43 33 * 34 * $FreeBSD$ 35 */ 36 37 /* 38 * TODO: 39 * remove empty directories 40 * mkdir: want it ? 41 */ 42 43 #include "opt_mac.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/conf.h> 48 #include <sys/dirent.h> 49 #include <sys/fcntl.h> 50 #include <sys/file.h> 51 #include <sys/filedesc.h> 52 #include <sys/filio.h> 53 #include <sys/kernel.h> 54 #include <sys/lock.h> 55 #include <sys/malloc.h> 56 #include <sys/mount.h> 57 #include <sys/namei.h> 58 #include <sys/priv.h> 59 #include <sys/proc.h> 60 #include <sys/stat.h> 61 #include <sys/sx.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 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 struct mtx devfs_de_interlock; 77 MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF); 78 struct sx clone_drain_lock; 79 SX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock"); 80 81 static int 82 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp) 83 { 84 85 *dswp = devvn_refthread(fp->f_vnode, devp); 86 if (*devp != fp->f_data) { 87 if (*dswp != NULL) 88 dev_relthread(*devp); 89 return (ENXIO); 90 } 91 KASSERT((*devp)->si_refcount > 0, 92 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp))); 93 if (*dswp == NULL) 94 return (ENXIO); 95 return (0); 96 } 97 98 /* 99 * Construct the fully qualified path name relative to the mountpoint 100 */ 101 static char * 102 devfs_fqpn(char *buf, struct vnode *dvp, struct componentname *cnp) 103 { 104 int i; 105 struct devfs_dirent *de, *dd; 106 struct devfs_mount *dmp; 107 108 dmp = VFSTODEVFS(dvp->v_mount); 109 dd = dvp->v_data; 110 i = SPECNAMELEN; 111 buf[i] = '\0'; 112 i -= cnp->cn_namelen; 113 if (i < 0) 114 return (NULL); 115 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); 116 de = dd; 117 while (de != dmp->dm_rootdir) { 118 i--; 119 if (i < 0) 120 return (NULL); 121 buf[i] = '/'; 122 i -= de->de_dirent->d_namlen; 123 if (i < 0) 124 return (NULL); 125 bcopy(de->de_dirent->d_name, buf + i, 126 de->de_dirent->d_namlen); 127 de = TAILQ_FIRST(&de->de_dlist); /* "." */ 128 de = TAILQ_NEXT(de, de_list); /* ".." */ 129 de = de->de_dir; 130 } 131 return (buf + i); 132 } 133 134 static int 135 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp, 136 struct devfs_dirent *de) 137 { 138 int not_found; 139 140 not_found = 0; 141 if (de->de_flags & DE_DOOMED) 142 not_found = 1; 143 if (DEVFS_DE_DROP(de)) { 144 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed")); 145 devfs_dirent_free(de); 146 } 147 if (DEVFS_DMP_DROP(dmp)) { 148 KASSERT(not_found == 1, 149 ("DEVFS mount struct freed before dirent")); 150 not_found = 2; 151 sx_xunlock(&dmp->dm_lock); 152 devfs_unmount_final(dmp); 153 } 154 if (not_found == 1 || (drop_dm_lock && not_found != 2)) 155 sx_unlock(&dmp->dm_lock); 156 return (not_found); 157 } 158 159 static void 160 devfs_insmntque_dtr(struct vnode *vp, void *arg) 161 { 162 struct devfs_dirent *de; 163 164 de = (struct devfs_dirent *)arg; 165 mtx_lock(&devfs_de_interlock); 166 vp->v_data = NULL; 167 de->de_vnode = NULL; 168 mtx_unlock(&devfs_de_interlock); 169 vgone(vp); 170 vput(vp); 171 } 172 173 /* 174 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops 175 * it on return. 176 */ 177 int 178 devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td) 179 { 180 int error; 181 struct vnode *vp; 182 struct cdev *dev; 183 struct devfs_mount *dmp; 184 185 KASSERT(td == curthread, ("devfs_allocv: td != curthread")); 186 dmp = VFSTODEVFS(mp); 187 if (de->de_flags & DE_DOOMED) { 188 sx_xunlock(&dmp->dm_lock); 189 return (ENOENT); 190 } 191 loop: 192 DEVFS_DE_HOLD(de); 193 DEVFS_DMP_HOLD(dmp); 194 mtx_lock(&devfs_de_interlock); 195 vp = de->de_vnode; 196 if (vp != NULL) { 197 VI_LOCK(vp); 198 mtx_unlock(&devfs_de_interlock); 199 sx_xunlock(&dmp->dm_lock); 200 error = vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td); 201 sx_xlock(&dmp->dm_lock); 202 if (devfs_allocv_drop_refs(0, dmp, de)) { 203 if (error == 0) 204 vput(vp); 205 return (ENOENT); 206 } 207 else if (error) 208 goto loop; 209 sx_xunlock(&dmp->dm_lock); 210 *vpp = vp; 211 return (0); 212 } 213 mtx_unlock(&devfs_de_interlock); 214 if (de->de_dirent->d_type == DT_CHR) { 215 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { 216 devfs_allocv_drop_refs(1, dmp, de); 217 return (ENOENT); 218 } 219 dev = &de->de_cdp->cdp_c; 220 } else { 221 dev = NULL; 222 } 223 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 224 if (error != 0) { 225 devfs_allocv_drop_refs(1, dmp, de); 226 printf("devfs_allocv: failed to allocate new vnode\n"); 227 return (error); 228 } 229 230 if (de->de_dirent->d_type == DT_CHR) { 231 vp->v_type = VCHR; 232 VI_LOCK(vp); 233 dev_lock(); 234 dev_refl(dev); 235 /* XXX: v_rdev should be protect by vnode lock */ 236 vp->v_rdev = dev; 237 KASSERT(vp->v_usecount == 1, 238 ("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount)); 239 dev->si_usecount += vp->v_usecount; 240 dev_unlock(); 241 VI_UNLOCK(vp); 242 vp->v_op = &devfs_specops; 243 } else if (de->de_dirent->d_type == DT_DIR) { 244 vp->v_type = VDIR; 245 } else if (de->de_dirent->d_type == DT_LNK) { 246 vp->v_type = VLNK; 247 } else { 248 vp->v_type = VBAD; 249 } 250 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 251 mtx_lock(&devfs_de_interlock); 252 vp->v_data = de; 253 de->de_vnode = vp; 254 mtx_unlock(&devfs_de_interlock); 255 error = insmntque1(vp, mp, devfs_insmntque_dtr, de); 256 if (error != 0) { 257 (void) devfs_allocv_drop_refs(1, dmp, de); 258 return (error); 259 } 260 if (devfs_allocv_drop_refs(0, dmp, de)) { 261 vput(vp); 262 return (ENOENT); 263 } 264 #ifdef MAC 265 mac_devfs_vnode_associate(mp, de, vp); 266 #endif 267 sx_xunlock(&dmp->dm_lock); 268 *vpp = vp; 269 return (0); 270 } 271 272 static int 273 devfs_access(struct vop_access_args *ap) 274 { 275 struct vnode *vp = ap->a_vp; 276 struct devfs_dirent *de; 277 int error; 278 279 de = vp->v_data; 280 if (vp->v_type == VDIR) 281 de = de->de_dir; 282 283 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 284 ap->a_mode, ap->a_cred, NULL); 285 if (!error) 286 return (error); 287 if (error != EACCES) 288 return (error); 289 /* We do, however, allow access to the controlling terminal */ 290 if (!(ap->a_td->td_proc->p_flag & P_CONTROLT)) 291 return (error); 292 if (ap->a_td->td_proc->p_session->s_ttyvp == de->de_vnode) 293 return (0); 294 return (error); 295 } 296 297 /* ARGSUSED */ 298 static int 299 devfs_advlock(struct vop_advlock_args *ap) 300 { 301 302 return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL); 303 } 304 305 /* ARGSUSED */ 306 static int 307 devfs_close(struct vop_close_args *ap) 308 { 309 struct vnode *vp = ap->a_vp, *oldvp; 310 struct thread *td = ap->a_td; 311 struct cdev *dev = vp->v_rdev; 312 struct cdevsw *dsw; 313 int vp_locked, error; 314 315 /* 316 * Hack: a tty device that is a controlling terminal 317 * has a reference from the session structure. 318 * We cannot easily tell that a character device is 319 * a controlling terminal, unless it is the closing 320 * process' controlling terminal. In that case, 321 * if the reference count is 2 (this last descriptor 322 * plus the session), release the reference from the session. 323 */ 324 oldvp = NULL; 325 sx_xlock(&proctree_lock); 326 if (td && vp == td->td_proc->p_session->s_ttyvp) { 327 SESS_LOCK(td->td_proc->p_session); 328 VI_LOCK(vp); 329 if (count_dev(dev) == 2 && (vp->v_iflag & VI_DOOMED) == 0) { 330 td->td_proc->p_session->s_ttyvp = NULL; 331 oldvp = vp; 332 } 333 VI_UNLOCK(vp); 334 SESS_UNLOCK(td->td_proc->p_session); 335 } 336 sx_xunlock(&proctree_lock); 337 if (oldvp != NULL) 338 vrele(oldvp); 339 /* 340 * We do not want to really close the device if it 341 * is still in use unless we are trying to close it 342 * forcibly. Since every use (buffer, vnode, swap, cmap) 343 * holds a reference to the vnode, and because we mark 344 * any other vnodes that alias this device, when the 345 * sum of the reference counts on all the aliased 346 * vnodes descends to one, we are on last close. 347 */ 348 dsw = dev_refthread(dev); 349 if (dsw == NULL) 350 return (ENXIO); 351 VI_LOCK(vp); 352 if (vp->v_iflag & VI_DOOMED) { 353 /* Forced close. */ 354 } else if (dsw->d_flags & D_TRACKCLOSE) { 355 /* Keep device updated on status. */ 356 } else if (count_dev(dev) > 1) { 357 VI_UNLOCK(vp); 358 dev_relthread(dev); 359 return (0); 360 } 361 vholdl(vp); 362 VI_UNLOCK(vp); 363 vp_locked = VOP_ISLOCKED(vp); 364 VOP_UNLOCK(vp, 0); 365 KASSERT(dev->si_refcount > 0, 366 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 367 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 368 dev_relthread(dev); 369 vn_lock(vp, vp_locked | LK_RETRY); 370 vdrop(vp); 371 return (error); 372 } 373 374 static int 375 devfs_close_f(struct file *fp, struct thread *td) 376 { 377 378 return (vnops.fo_close(fp, td)); 379 } 380 381 /* ARGSUSED */ 382 static int 383 devfs_fsync(struct vop_fsync_args *ap) 384 { 385 if (!vn_isdisk(ap->a_vp, NULL)) 386 return (0); 387 388 return (vop_stdfsync(ap)); 389 } 390 391 static int 392 devfs_getattr(struct vop_getattr_args *ap) 393 { 394 struct vnode *vp = ap->a_vp; 395 struct vattr *vap = ap->a_vap; 396 int error = 0; 397 struct devfs_dirent *de; 398 struct cdev *dev; 399 400 de = vp->v_data; 401 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 402 if (vp->v_type == VDIR) { 403 de = de->de_dir; 404 KASSERT(de != NULL, 405 ("Null dir dirent in devfs_getattr vp=%p", vp)); 406 } 407 bzero((caddr_t) vap, sizeof(*vap)); 408 vattr_null(vap); 409 vap->va_uid = de->de_uid; 410 vap->va_gid = de->de_gid; 411 vap->va_mode = de->de_mode; 412 if (vp->v_type == VLNK) 413 vap->va_size = strlen(de->de_symlink); 414 else if (vp->v_type == VDIR) 415 vap->va_size = vap->va_bytes = DEV_BSIZE; 416 else 417 vap->va_size = 0; 418 if (vp->v_type != VDIR) 419 vap->va_bytes = 0; 420 vap->va_blocksize = DEV_BSIZE; 421 vap->va_type = vp->v_type; 422 423 #define fix(aa) \ 424 do { \ 425 if ((aa).tv_sec <= 3600) { \ 426 (aa).tv_sec = boottime.tv_sec; \ 427 (aa).tv_nsec = boottime.tv_usec * 1000; \ 428 } \ 429 } while (0) 430 431 if (vp->v_type != VCHR) { 432 fix(de->de_atime); 433 vap->va_atime = de->de_atime; 434 fix(de->de_mtime); 435 vap->va_mtime = de->de_mtime; 436 fix(de->de_ctime); 437 vap->va_ctime = de->de_ctime; 438 } else { 439 dev = vp->v_rdev; 440 fix(dev->si_atime); 441 vap->va_atime = dev->si_atime; 442 fix(dev->si_mtime); 443 vap->va_mtime = dev->si_mtime; 444 fix(dev->si_ctime); 445 vap->va_ctime = dev->si_ctime; 446 447 vap->va_rdev = dev->si_priv->cdp_inode; 448 } 449 vap->va_gen = 0; 450 vap->va_flags = 0; 451 vap->va_nlink = de->de_links; 452 vap->va_fileid = de->de_inode; 453 454 return (error); 455 } 456 457 /* ARGSUSED */ 458 static int 459 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 460 { 461 struct cdev *dev; 462 struct cdevsw *dsw; 463 struct vnode *vp; 464 struct vnode *vpold; 465 int error, i; 466 const char *p; 467 struct fiodgname_arg *fgn; 468 469 error = devfs_fp_check(fp, &dev, &dsw); 470 if (error) 471 return (error); 472 473 if (com == FIODTYPE) { 474 *(int *)data = dsw->d_flags & D_TYPEMASK; 475 dev_relthread(dev); 476 return (0); 477 } else if (com == FIODGNAME) { 478 fgn = data; 479 p = devtoname(dev); 480 i = strlen(p) + 1; 481 if (i > fgn->len) 482 error = EINVAL; 483 else 484 error = copyout(p, fgn->buf, i); 485 dev_relthread(dev); 486 return (error); 487 } 488 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td); 489 dev_relthread(dev); 490 if (error == ENOIOCTL) 491 error = ENOTTY; 492 if (error == 0 && com == TIOCSCTTY) { 493 vp = fp->f_vnode; 494 495 /* Do nothing if reassigning same control tty */ 496 sx_slock(&proctree_lock); 497 if (td->td_proc->p_session->s_ttyvp == vp) { 498 sx_sunlock(&proctree_lock); 499 return (0); 500 } 501 502 mtx_lock(&Giant); /* XXX TTY */ 503 504 vpold = td->td_proc->p_session->s_ttyvp; 505 VREF(vp); 506 SESS_LOCK(td->td_proc->p_session); 507 td->td_proc->p_session->s_ttyvp = vp; 508 SESS_UNLOCK(td->td_proc->p_session); 509 510 sx_sunlock(&proctree_lock); 511 512 /* Get rid of reference to old control tty */ 513 if (vpold) 514 vrele(vpold); 515 mtx_unlock(&Giant); /* XXX TTY */ 516 } 517 return (error); 518 } 519 520 /* ARGSUSED */ 521 static int 522 devfs_kqfilter_f(struct file *fp, struct knote *kn) 523 { 524 struct cdev *dev; 525 struct cdevsw *dsw; 526 int error; 527 528 error = devfs_fp_check(fp, &dev, &dsw); 529 if (error) 530 return (error); 531 error = dsw->d_kqfilter(dev, kn); 532 dev_relthread(dev); 533 return (error); 534 } 535 536 static int 537 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 538 { 539 struct componentname *cnp; 540 struct vnode *dvp, **vpp; 541 struct thread *td; 542 struct devfs_dirent *de, *dd; 543 struct devfs_dirent **dde; 544 struct devfs_mount *dmp; 545 struct cdev *cdev; 546 int error, flags, nameiop; 547 char specname[SPECNAMELEN + 1], *pname; 548 549 cnp = ap->a_cnp; 550 vpp = ap->a_vpp; 551 dvp = ap->a_dvp; 552 pname = cnp->cn_nameptr; 553 td = cnp->cn_thread; 554 flags = cnp->cn_flags; 555 nameiop = cnp->cn_nameiop; 556 dmp = VFSTODEVFS(dvp->v_mount); 557 dd = dvp->v_data; 558 *vpp = NULLVP; 559 560 if ((flags & ISLASTCN) && nameiop == RENAME) 561 return (EOPNOTSUPP); 562 563 if (dvp->v_type != VDIR) 564 return (ENOTDIR); 565 566 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 567 return (EIO); 568 569 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 570 if (error) 571 return (error); 572 573 if (cnp->cn_namelen == 1 && *pname == '.') { 574 if ((flags & ISLASTCN) && nameiop != LOOKUP) 575 return (EINVAL); 576 *vpp = dvp; 577 VREF(dvp); 578 return (0); 579 } 580 581 if (flags & ISDOTDOT) { 582 if ((flags & ISLASTCN) && nameiop != LOOKUP) 583 return (EINVAL); 584 VOP_UNLOCK(dvp, 0); 585 de = TAILQ_FIRST(&dd->de_dlist); /* "." */ 586 de = TAILQ_NEXT(de, de_list); /* ".." */ 587 de = de->de_dir; 588 error = devfs_allocv(de, dvp->v_mount, vpp, td); 589 *dm_unlock = 0; 590 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 591 return (error); 592 } 593 594 DEVFS_DMP_HOLD(dmp); 595 devfs_populate(dmp); 596 if (DEVFS_DMP_DROP(dmp)) { 597 *dm_unlock = 0; 598 sx_xunlock(&dmp->dm_lock); 599 devfs_unmount_final(dmp); 600 return (ENOENT); 601 } 602 dd = dvp->v_data; 603 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen); 604 while (de == NULL) { /* While(...) so we can use break */ 605 606 if (nameiop == DELETE) 607 return (ENOENT); 608 609 /* 610 * OK, we didn't have an entry for the name we were asked for 611 * so we try to see if anybody can create it on demand. 612 */ 613 pname = devfs_fqpn(specname, dvp, cnp); 614 if (pname == NULL) 615 break; 616 617 cdev = NULL; 618 DEVFS_DMP_HOLD(dmp); 619 sx_xunlock(&dmp->dm_lock); 620 sx_slock(&clone_drain_lock); 621 EVENTHANDLER_INVOKE(dev_clone, 622 td->td_ucred, pname, strlen(pname), &cdev); 623 sx_sunlock(&clone_drain_lock); 624 sx_xlock(&dmp->dm_lock); 625 if (DEVFS_DMP_DROP(dmp)) { 626 *dm_unlock = 0; 627 sx_xunlock(&dmp->dm_lock); 628 devfs_unmount_final(dmp); 629 return (ENOENT); 630 } 631 if (cdev == NULL) 632 break; 633 634 DEVFS_DMP_HOLD(dmp); 635 devfs_populate(dmp); 636 if (DEVFS_DMP_DROP(dmp)) { 637 *dm_unlock = 0; 638 sx_xunlock(&dmp->dm_lock); 639 devfs_unmount_final(dmp); 640 return (ENOENT); 641 } 642 643 dev_lock(); 644 dde = &cdev->si_priv->cdp_dirents[dmp->dm_idx]; 645 if (dde != NULL && *dde != NULL) 646 de = *dde; 647 dev_unlock(); 648 dev_rel(cdev); 649 break; 650 } 651 652 if (de == NULL || de->de_flags & DE_WHITEOUT) { 653 if ((nameiop == CREATE || nameiop == RENAME) && 654 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 655 cnp->cn_flags |= SAVENAME; 656 return (EJUSTRETURN); 657 } 658 return (ENOENT); 659 } 660 661 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 662 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 663 if (error) 664 return (error); 665 if (*vpp == dvp) { 666 VREF(dvp); 667 *vpp = dvp; 668 return (0); 669 } 670 } 671 error = devfs_allocv(de, dvp->v_mount, vpp, td); 672 *dm_unlock = 0; 673 return (error); 674 } 675 676 static int 677 devfs_lookup(struct vop_lookup_args *ap) 678 { 679 int j; 680 struct devfs_mount *dmp; 681 int dm_unlock; 682 683 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 684 dm_unlock = 1; 685 sx_xlock(&dmp->dm_lock); 686 j = devfs_lookupx(ap, &dm_unlock); 687 if (dm_unlock == 1) 688 sx_xunlock(&dmp->dm_lock); 689 return (j); 690 } 691 692 static int 693 devfs_mknod(struct vop_mknod_args *ap) 694 { 695 struct componentname *cnp; 696 struct vnode *dvp, **vpp; 697 struct thread *td; 698 struct devfs_dirent *dd, *de; 699 struct devfs_mount *dmp; 700 int error; 701 702 /* 703 * The only type of node we should be creating here is a 704 * character device, for anything else return EOPNOTSUPP. 705 */ 706 if (ap->a_vap->va_type != VCHR) 707 return (EOPNOTSUPP); 708 dvp = ap->a_dvp; 709 dmp = VFSTODEVFS(dvp->v_mount); 710 711 cnp = ap->a_cnp; 712 vpp = ap->a_vpp; 713 td = cnp->cn_thread; 714 dd = dvp->v_data; 715 716 error = ENOENT; 717 sx_xlock(&dmp->dm_lock); 718 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 719 if (cnp->cn_namelen != de->de_dirent->d_namlen) 720 continue; 721 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 722 de->de_dirent->d_namlen) != 0) 723 continue; 724 if (de->de_flags & DE_WHITEOUT) 725 break; 726 goto notfound; 727 } 728 if (de == NULL) 729 goto notfound; 730 de->de_flags &= ~DE_WHITEOUT; 731 error = devfs_allocv(de, dvp->v_mount, vpp, td); 732 return (error); 733 notfound: 734 sx_xunlock(&dmp->dm_lock); 735 return (error); 736 } 737 738 /* ARGSUSED */ 739 static int 740 devfs_open(struct vop_open_args *ap) 741 { 742 struct thread *td = ap->a_td; 743 struct vnode *vp = ap->a_vp; 744 struct cdev *dev = vp->v_rdev; 745 struct file *fp = ap->a_fp; 746 int error; 747 struct cdevsw *dsw; 748 749 if (vp->v_type == VBLK) 750 return (ENXIO); 751 752 if (dev == NULL) 753 return (ENXIO); 754 755 /* Make this field valid before any I/O in d_open. */ 756 if (dev->si_iosize_max == 0) 757 dev->si_iosize_max = DFLTPHYS; 758 759 dsw = dev_refthread(dev); 760 if (dsw == NULL) 761 return (ENXIO); 762 763 /* XXX: Special casing of ttys for deadfs. Probably redundant. */ 764 if (dsw->d_flags & D_TTY) 765 vp->v_vflag |= VV_ISTTY; 766 767 VOP_UNLOCK(vp, 0); 768 769 if (dsw->d_fdopen != NULL) 770 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 771 else 772 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 773 774 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 775 776 dev_relthread(dev); 777 778 if (error) 779 return (error); 780 781 #if 0 /* /dev/console */ 782 KASSERT(fp != NULL, 783 ("Could not vnode bypass device on NULL fp")); 784 #else 785 if(fp == NULL) 786 return (error); 787 #endif 788 KASSERT(fp->f_ops == &badfileops, 789 ("Could not vnode bypass device on fdops %p", fp->f_ops)); 790 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f); 791 return (error); 792 } 793 794 static int 795 devfs_pathconf(struct vop_pathconf_args *ap) 796 { 797 798 switch (ap->a_name) { 799 case _PC_MAC_PRESENT: 800 #ifdef MAC 801 /* 802 * If MAC is enabled, devfs automatically supports 803 * trivial non-persistant label storage. 804 */ 805 *ap->a_retval = 1; 806 #else 807 *ap->a_retval = 0; 808 #endif 809 return (0); 810 default: 811 return (vop_stdpathconf(ap)); 812 } 813 /* NOTREACHED */ 814 } 815 816 /* ARGSUSED */ 817 static int 818 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 819 { 820 struct cdev *dev; 821 struct cdevsw *dsw; 822 int error; 823 824 error = devfs_fp_check(fp, &dev, &dsw); 825 if (error) 826 return (error); 827 error = dsw->d_poll(dev, events, td); 828 dev_relthread(dev); 829 return(error); 830 } 831 832 /* 833 * Print out the contents of a special device vnode. 834 */ 835 static int 836 devfs_print(struct vop_print_args *ap) 837 { 838 839 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 840 return (0); 841 } 842 843 /* ARGSUSED */ 844 static int 845 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 846 { 847 struct cdev *dev; 848 int ioflag, error, resid; 849 struct cdevsw *dsw; 850 851 error = devfs_fp_check(fp, &dev, &dsw); 852 if (error) 853 return (error); 854 resid = uio->uio_resid; 855 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 856 if (ioflag & O_DIRECT) 857 ioflag |= IO_DIRECT; 858 859 if ((flags & FOF_OFFSET) == 0) 860 uio->uio_offset = fp->f_offset; 861 862 error = dsw->d_read(dev, uio, ioflag); 863 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 864 vfs_timestamp(&dev->si_atime); 865 dev_relthread(dev); 866 867 if ((flags & FOF_OFFSET) == 0) 868 fp->f_offset = uio->uio_offset; 869 fp->f_nextoff = uio->uio_offset; 870 return (error); 871 } 872 873 static int 874 devfs_readdir(struct vop_readdir_args *ap) 875 { 876 int error; 877 struct uio *uio; 878 struct dirent *dp; 879 struct devfs_dirent *dd; 880 struct devfs_dirent *de; 881 struct devfs_mount *dmp; 882 off_t off, oldoff; 883 int *tmp_ncookies = NULL; 884 885 if (ap->a_vp->v_type != VDIR) 886 return (ENOTDIR); 887 888 uio = ap->a_uio; 889 if (uio->uio_offset < 0) 890 return (EINVAL); 891 892 /* 893 * XXX: This is a temporary hack to get around this filesystem not 894 * supporting cookies. We store the location of the ncookies pointer 895 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 896 * and set the number of cookies to 0. We then set the pointer to 897 * NULL so that vfs_read_dirent doesn't try to call realloc() on 898 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 899 * pointer to its original location before returning to the caller. 900 */ 901 if (ap->a_ncookies != NULL) { 902 tmp_ncookies = ap->a_ncookies; 903 *ap->a_ncookies = 0; 904 ap->a_ncookies = NULL; 905 } 906 907 dmp = VFSTODEVFS(ap->a_vp->v_mount); 908 sx_xlock(&dmp->dm_lock); 909 DEVFS_DMP_HOLD(dmp); 910 devfs_populate(dmp); 911 if (DEVFS_DMP_DROP(dmp)) { 912 sx_xunlock(&dmp->dm_lock); 913 devfs_unmount_final(dmp); 914 if (tmp_ncookies != NULL) 915 ap->a_ncookies = tmp_ncookies; 916 return (EIO); 917 } 918 error = 0; 919 de = ap->a_vp->v_data; 920 off = 0; 921 oldoff = uio->uio_offset; 922 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 923 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 924 if (dd->de_flags & DE_WHITEOUT) 925 continue; 926 if (dd->de_dirent->d_type == DT_DIR) 927 de = dd->de_dir; 928 else 929 de = dd; 930 dp = dd->de_dirent; 931 if (dp->d_reclen > uio->uio_resid) 932 break; 933 dp->d_fileno = de->de_inode; 934 if (off >= uio->uio_offset) { 935 error = vfs_read_dirent(ap, dp, off); 936 if (error) 937 break; 938 } 939 off += dp->d_reclen; 940 } 941 sx_xunlock(&dmp->dm_lock); 942 uio->uio_offset = off; 943 944 /* 945 * Restore ap->a_ncookies if it wasn't originally NULL in the first 946 * place. 947 */ 948 if (tmp_ncookies != NULL) 949 ap->a_ncookies = tmp_ncookies; 950 951 return (error); 952 } 953 954 static int 955 devfs_readlink(struct vop_readlink_args *ap) 956 { 957 struct devfs_dirent *de; 958 959 de = ap->a_vp->v_data; 960 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 961 } 962 963 static int 964 devfs_reclaim(struct vop_reclaim_args *ap) 965 { 966 struct vnode *vp = ap->a_vp; 967 struct devfs_dirent *de; 968 struct cdev *dev; 969 970 mtx_lock(&devfs_de_interlock); 971 de = vp->v_data; 972 if (de != NULL) { 973 de->de_vnode = NULL; 974 vp->v_data = NULL; 975 } 976 mtx_unlock(&devfs_de_interlock); 977 978 vnode_destroy_vobject(vp); 979 980 VI_LOCK(vp); 981 dev_lock(); 982 dev = vp->v_rdev; 983 vp->v_rdev = NULL; 984 985 if (dev == NULL) { 986 dev_unlock(); 987 VI_UNLOCK(vp); 988 return (0); 989 } 990 991 dev->si_usecount -= vp->v_usecount; 992 dev_unlock(); 993 VI_UNLOCK(vp); 994 dev_rel(dev); 995 return (0); 996 } 997 998 static int 999 devfs_remove(struct vop_remove_args *ap) 1000 { 1001 struct vnode *vp = ap->a_vp; 1002 struct devfs_dirent *dd; 1003 struct devfs_dirent *de; 1004 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1005 1006 sx_xlock(&dmp->dm_lock); 1007 dd = ap->a_dvp->v_data; 1008 de = vp->v_data; 1009 if (de->de_cdp == NULL) { 1010 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1011 devfs_delete(dmp, de, 1); 1012 } else { 1013 de->de_flags |= DE_WHITEOUT; 1014 } 1015 sx_xunlock(&dmp->dm_lock); 1016 return (0); 1017 } 1018 1019 /* 1020 * Revoke is called on a tty when a terminal session ends. The vnode 1021 * is orphaned by setting v_op to deadfs so we need to let go of it 1022 * as well so that we create a new one next time around. 1023 * 1024 */ 1025 static int 1026 devfs_revoke(struct vop_revoke_args *ap) 1027 { 1028 struct vnode *vp = ap->a_vp, *vp2; 1029 struct cdev *dev; 1030 struct cdev_priv *cdp; 1031 struct devfs_dirent *de; 1032 int i; 1033 1034 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1035 1036 dev = vp->v_rdev; 1037 cdp = dev->si_priv; 1038 1039 dev_lock(); 1040 cdp->cdp_inuse++; 1041 dev_unlock(); 1042 1043 vhold(vp); 1044 vgone(vp); 1045 vdrop(vp); 1046 1047 VOP_UNLOCK(vp,0); 1048 loop: 1049 for (;;) { 1050 mtx_lock(&devfs_de_interlock); 1051 dev_lock(); 1052 vp2 = NULL; 1053 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1054 de = cdp->cdp_dirents[i]; 1055 if (de == NULL) 1056 continue; 1057 1058 vp2 = de->de_vnode; 1059 if (vp2 != NULL) { 1060 dev_unlock(); 1061 VI_LOCK(vp2); 1062 mtx_unlock(&devfs_de_interlock); 1063 if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK, 1064 curthread)) 1065 goto loop; 1066 vhold(vp2); 1067 vgone(vp2); 1068 vdrop(vp2); 1069 vput(vp2); 1070 break; 1071 } 1072 } 1073 if (vp2 != NULL) { 1074 continue; 1075 } 1076 dev_unlock(); 1077 mtx_unlock(&devfs_de_interlock); 1078 break; 1079 } 1080 dev_lock(); 1081 cdp->cdp_inuse--; 1082 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1083 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1084 dev_unlock(); 1085 dev_rel(&cdp->cdp_c); 1086 } else 1087 dev_unlock(); 1088 1089 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1090 return (0); 1091 } 1092 1093 static int 1094 devfs_rioctl(struct vop_ioctl_args *ap) 1095 { 1096 int error; 1097 struct devfs_mount *dmp; 1098 1099 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1100 sx_xlock(&dmp->dm_lock); 1101 DEVFS_DMP_HOLD(dmp); 1102 devfs_populate(dmp); 1103 if (DEVFS_DMP_DROP(dmp)) { 1104 sx_xunlock(&dmp->dm_lock); 1105 devfs_unmount_final(dmp); 1106 return (ENOENT); 1107 } 1108 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1109 sx_xunlock(&dmp->dm_lock); 1110 return (error); 1111 } 1112 1113 static int 1114 devfs_rread(struct vop_read_args *ap) 1115 { 1116 1117 if (ap->a_vp->v_type != VDIR) 1118 return (EINVAL); 1119 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1120 } 1121 1122 static int 1123 devfs_setattr(struct vop_setattr_args *ap) 1124 { 1125 struct devfs_dirent *de; 1126 struct vattr *vap; 1127 struct vnode *vp; 1128 int c, error; 1129 uid_t uid; 1130 gid_t gid; 1131 1132 vap = ap->a_vap; 1133 vp = ap->a_vp; 1134 if ((vap->va_type != VNON) || 1135 (vap->va_nlink != VNOVAL) || 1136 (vap->va_fsid != VNOVAL) || 1137 (vap->va_fileid != VNOVAL) || 1138 (vap->va_blocksize != VNOVAL) || 1139 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1140 (vap->va_rdev != VNOVAL) || 1141 ((int)vap->va_bytes != VNOVAL) || 1142 (vap->va_gen != VNOVAL)) { 1143 return (EINVAL); 1144 } 1145 1146 de = vp->v_data; 1147 if (vp->v_type == VDIR) 1148 de = de->de_dir; 1149 1150 error = c = 0; 1151 if (vap->va_uid == (uid_t)VNOVAL) 1152 uid = de->de_uid; 1153 else 1154 uid = vap->va_uid; 1155 if (vap->va_gid == (gid_t)VNOVAL) 1156 gid = de->de_gid; 1157 else 1158 gid = vap->va_gid; 1159 if (uid != de->de_uid || gid != de->de_gid) { 1160 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1161 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1162 error = priv_check(ap->a_td, PRIV_VFS_CHOWN); 1163 if (error) 1164 return (error); 1165 } 1166 de->de_uid = uid; 1167 de->de_gid = gid; 1168 c = 1; 1169 } 1170 1171 if (vap->va_mode != (mode_t)VNOVAL) { 1172 if (ap->a_cred->cr_uid != de->de_uid) { 1173 error = priv_check(ap->a_td, PRIV_VFS_ADMIN); 1174 if (error) 1175 return (error); 1176 } 1177 de->de_mode = vap->va_mode; 1178 c = 1; 1179 } 1180 1181 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1182 /* See the comment in ufs_vnops::ufs_setattr(). */ 1183 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) && 1184 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1185 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td)))) 1186 return (error); 1187 if (vap->va_atime.tv_sec != VNOVAL) { 1188 if (vp->v_type == VCHR) 1189 vp->v_rdev->si_atime = vap->va_atime; 1190 else 1191 de->de_atime = vap->va_atime; 1192 } 1193 if (vap->va_mtime.tv_sec != VNOVAL) { 1194 if (vp->v_type == VCHR) 1195 vp->v_rdev->si_mtime = vap->va_mtime; 1196 else 1197 de->de_mtime = vap->va_mtime; 1198 } 1199 c = 1; 1200 } 1201 1202 if (c) { 1203 if (vp->v_type == VCHR) 1204 vfs_timestamp(&vp->v_rdev->si_ctime); 1205 else 1206 vfs_timestamp(&de->de_mtime); 1207 } 1208 return (0); 1209 } 1210 1211 #ifdef MAC 1212 static int 1213 devfs_setlabel(struct vop_setlabel_args *ap) 1214 { 1215 struct vnode *vp; 1216 struct devfs_dirent *de; 1217 1218 vp = ap->a_vp; 1219 de = vp->v_data; 1220 1221 mac_vnode_relabel(ap->a_cred, vp, ap->a_label); 1222 mac_devfs_update(vp->v_mount, de, vp); 1223 1224 return (0); 1225 } 1226 #endif 1227 1228 static int 1229 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) 1230 { 1231 1232 return (vnops.fo_stat(fp, sb, cred, td)); 1233 } 1234 1235 static int 1236 devfs_symlink(struct vop_symlink_args *ap) 1237 { 1238 int i, error; 1239 struct devfs_dirent *dd; 1240 struct devfs_dirent *de; 1241 struct devfs_mount *dmp; 1242 struct thread *td; 1243 1244 td = ap->a_cnp->cn_thread; 1245 KASSERT(td == curthread, ("devfs_symlink: td != curthread")); 1246 1247 error = priv_check(td, PRIV_DEVFS_SYMLINK); 1248 if (error) 1249 return(error); 1250 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1251 dd = ap->a_dvp->v_data; 1252 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1253 de->de_uid = 0; 1254 de->de_gid = 0; 1255 de->de_mode = 0755; 1256 de->de_inode = alloc_unr(devfs_inos); 1257 de->de_dirent->d_type = DT_LNK; 1258 i = strlen(ap->a_target) + 1; 1259 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1260 bcopy(ap->a_target, de->de_symlink, i); 1261 sx_xlock(&dmp->dm_lock); 1262 #ifdef MAC 1263 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1264 #endif 1265 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 1266 return (devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, td)); 1267 } 1268 1269 static int 1270 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) 1271 { 1272 1273 return (vnops.fo_truncate(fp, length, cred, td)); 1274 } 1275 1276 /* ARGSUSED */ 1277 static int 1278 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 1279 { 1280 struct cdev *dev; 1281 int error, ioflag, resid; 1282 struct cdevsw *dsw; 1283 1284 error = devfs_fp_check(fp, &dev, &dsw); 1285 if (error) 1286 return (error); 1287 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1288 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1289 if (ioflag & O_DIRECT) 1290 ioflag |= IO_DIRECT; 1291 if ((flags & FOF_OFFSET) == 0) 1292 uio->uio_offset = fp->f_offset; 1293 1294 resid = uio->uio_resid; 1295 1296 error = dsw->d_write(dev, uio, ioflag); 1297 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1298 vfs_timestamp(&dev->si_ctime); 1299 dev->si_mtime = dev->si_ctime; 1300 } 1301 dev_relthread(dev); 1302 1303 if ((flags & FOF_OFFSET) == 0) 1304 fp->f_offset = uio->uio_offset; 1305 fp->f_nextoff = uio->uio_offset; 1306 return (error); 1307 } 1308 1309 dev_t 1310 dev2udev(struct cdev *x) 1311 { 1312 if (x == NULL) 1313 return (NODEV); 1314 return (x->si_priv->cdp_inode); 1315 } 1316 1317 static struct fileops devfs_ops_f = { 1318 .fo_read = devfs_read_f, 1319 .fo_write = devfs_write_f, 1320 .fo_truncate = devfs_truncate_f, 1321 .fo_ioctl = devfs_ioctl_f, 1322 .fo_poll = devfs_poll_f, 1323 .fo_kqfilter = devfs_kqfilter_f, 1324 .fo_stat = devfs_stat_f, 1325 .fo_close = devfs_close_f, 1326 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 1327 }; 1328 1329 static struct vop_vector devfs_vnodeops = { 1330 .vop_default = &default_vnodeops, 1331 1332 .vop_access = devfs_access, 1333 .vop_getattr = devfs_getattr, 1334 .vop_ioctl = devfs_rioctl, 1335 .vop_lookup = devfs_lookup, 1336 .vop_mknod = devfs_mknod, 1337 .vop_pathconf = devfs_pathconf, 1338 .vop_read = devfs_rread, 1339 .vop_readdir = devfs_readdir, 1340 .vop_readlink = devfs_readlink, 1341 .vop_reclaim = devfs_reclaim, 1342 .vop_remove = devfs_remove, 1343 .vop_revoke = devfs_revoke, 1344 .vop_setattr = devfs_setattr, 1345 #ifdef MAC 1346 .vop_setlabel = devfs_setlabel, 1347 #endif 1348 .vop_symlink = devfs_symlink, 1349 }; 1350 1351 static struct vop_vector devfs_specops = { 1352 .vop_default = &default_vnodeops, 1353 1354 .vop_access = devfs_access, 1355 .vop_advlock = devfs_advlock, 1356 .vop_bmap = VOP_PANIC, 1357 .vop_close = devfs_close, 1358 .vop_create = VOP_PANIC, 1359 .vop_fsync = devfs_fsync, 1360 .vop_getattr = devfs_getattr, 1361 .vop_lease = VOP_NULL, 1362 .vop_link = VOP_PANIC, 1363 .vop_mkdir = VOP_PANIC, 1364 .vop_mknod = VOP_PANIC, 1365 .vop_open = devfs_open, 1366 .vop_pathconf = devfs_pathconf, 1367 .vop_print = devfs_print, 1368 .vop_read = VOP_PANIC, 1369 .vop_readdir = VOP_PANIC, 1370 .vop_readlink = VOP_PANIC, 1371 .vop_reallocblks = VOP_PANIC, 1372 .vop_reclaim = devfs_reclaim, 1373 .vop_remove = devfs_remove, 1374 .vop_rename = VOP_PANIC, 1375 .vop_revoke = devfs_revoke, 1376 .vop_rmdir = VOP_PANIC, 1377 .vop_setattr = devfs_setattr, 1378 #ifdef MAC 1379 .vop_setlabel = devfs_setlabel, 1380 #endif 1381 .vop_strategy = VOP_PANIC, 1382 .vop_symlink = VOP_PANIC, 1383 .vop_write = VOP_PANIC, 1384 }; 1385 1386 /* 1387 * Our calling convention to the device drivers used to be that we passed 1388 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 1389 * flags instead since that's what open(), close() and ioctl() takes and 1390 * we don't really want vnode.h in device drivers. 1391 * We solved the source compatibility by redefining some vnode flags to 1392 * be the same as the fcntl ones and by sending down the bitwise OR of 1393 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 1394 * pulls the rug out under this. 1395 */ 1396 CTASSERT(O_NONBLOCK == IO_NDELAY); 1397 CTASSERT(O_FSYNC == IO_SYNC); 1398