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 vp->v_rdev = dev; 236 KASSERT(vp->v_usecount == 1, 237 ("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount)); 238 dev->si_usecount += vp->v_usecount; 239 dev_unlock(); 240 VI_UNLOCK(vp); 241 vp->v_op = &devfs_specops; 242 } else if (de->de_dirent->d_type == DT_DIR) { 243 vp->v_type = VDIR; 244 } else if (de->de_dirent->d_type == DT_LNK) { 245 vp->v_type = VLNK; 246 } else { 247 vp->v_type = VBAD; 248 } 249 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 250 mtx_lock(&devfs_de_interlock); 251 vp->v_data = de; 252 de->de_vnode = vp; 253 mtx_unlock(&devfs_de_interlock); 254 error = insmntque1(vp, mp, devfs_insmntque_dtr, de); 255 if (error != 0) { 256 (void) devfs_allocv_drop_refs(1, dmp, de); 257 return (error); 258 } 259 if (devfs_allocv_drop_refs(0, dmp, de)) { 260 vput(vp); 261 return (ENOENT); 262 } 263 #ifdef MAC 264 mac_associate_vnode_devfs(mp, de, vp); 265 #endif 266 sx_xunlock(&dmp->dm_lock); 267 *vpp = vp; 268 return (0); 269 } 270 271 static int 272 devfs_access(struct vop_access_args *ap) 273 { 274 struct vnode *vp = ap->a_vp; 275 struct devfs_dirent *de; 276 int error; 277 278 de = vp->v_data; 279 if (vp->v_type == VDIR) 280 de = de->de_dir; 281 282 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 283 ap->a_mode, ap->a_cred, NULL); 284 if (!error) 285 return (error); 286 if (error != EACCES) 287 return (error); 288 /* We do, however, allow access to the controlling terminal */ 289 if (!(ap->a_td->td_proc->p_flag & P_CONTROLT)) 290 return (error); 291 if (ap->a_td->td_proc->p_session->s_ttyvp == de->de_vnode) 292 return (0); 293 return (error); 294 } 295 296 /* ARGSUSED */ 297 static int 298 devfs_advlock(struct vop_advlock_args *ap) 299 { 300 301 return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL); 302 } 303 304 /* ARGSUSED */ 305 static int 306 devfs_close(struct vop_close_args *ap) 307 { 308 struct vnode *vp = ap->a_vp, *oldvp; 309 struct thread *td = ap->a_td; 310 struct cdev *dev = vp->v_rdev; 311 struct cdevsw *dsw; 312 int vp_locked, error; 313 314 /* 315 * Hack: a tty device that is a controlling terminal 316 * has a reference from the session structure. 317 * We cannot easily tell that a character device is 318 * a controlling terminal, unless it is the closing 319 * process' controlling terminal. In that case, 320 * if the reference count is 2 (this last descriptor 321 * plus the session), release the reference from the session. 322 */ 323 oldvp = NULL; 324 sx_xlock(&proctree_lock); 325 if (td && vp == td->td_proc->p_session->s_ttyvp) { 326 SESS_LOCK(td->td_proc->p_session); 327 VI_LOCK(vp); 328 if (count_dev(dev) == 2 && (vp->v_iflag & VI_DOOMED) == 0) { 329 td->td_proc->p_session->s_ttyvp = NULL; 330 oldvp = vp; 331 } 332 VI_UNLOCK(vp); 333 SESS_UNLOCK(td->td_proc->p_session); 334 } 335 sx_xunlock(&proctree_lock); 336 if (oldvp != NULL) 337 vrele(oldvp); 338 /* 339 * We do not want to really close the device if it 340 * is still in use unless we are trying to close it 341 * forcibly. Since every use (buffer, vnode, swap, cmap) 342 * holds a reference to the vnode, and because we mark 343 * any other vnodes that alias this device, when the 344 * sum of the reference counts on all the aliased 345 * vnodes descends to one, we are on last close. 346 */ 347 dsw = dev_refthread(dev); 348 if (dsw == NULL) 349 return (ENXIO); 350 VI_LOCK(vp); 351 if (vp->v_iflag & VI_DOOMED) { 352 /* Forced close. */ 353 } else if (dsw->d_flags & D_TRACKCLOSE) { 354 /* Keep device updated on status. */ 355 } else if (count_dev(dev) > 1) { 356 VI_UNLOCK(vp); 357 dev_relthread(dev); 358 return (0); 359 } 360 vholdl(vp); 361 VI_UNLOCK(vp); 362 vp_locked = VOP_ISLOCKED(vp, td); 363 VOP_UNLOCK(vp, 0, td); 364 KASSERT(dev->si_refcount > 0, 365 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 366 if (!(dsw->d_flags & D_NEEDGIANT)) { 367 DROP_GIANT(); 368 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 369 PICKUP_GIANT(); 370 } else { 371 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 372 } 373 dev_relthread(dev); 374 vn_lock(vp, vp_locked | LK_RETRY, td); 375 vdrop(vp); 376 return (error); 377 } 378 379 static int 380 devfs_close_f(struct file *fp, struct thread *td) 381 { 382 383 return (vnops.fo_close(fp, td)); 384 } 385 386 /* ARGSUSED */ 387 static int 388 devfs_fsync(struct vop_fsync_args *ap) 389 { 390 if (!vn_isdisk(ap->a_vp, NULL)) 391 return (0); 392 393 return (vop_stdfsync(ap)); 394 } 395 396 static int 397 devfs_getattr(struct vop_getattr_args *ap) 398 { 399 struct vnode *vp = ap->a_vp; 400 struct vattr *vap = ap->a_vap; 401 int error = 0; 402 struct devfs_dirent *de; 403 struct cdev *dev; 404 405 de = vp->v_data; 406 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 407 if (vp->v_type == VDIR) { 408 de = de->de_dir; 409 KASSERT(de != NULL, 410 ("Null dir dirent in devfs_getattr vp=%p", vp)); 411 } 412 bzero((caddr_t) vap, sizeof(*vap)); 413 vattr_null(vap); 414 vap->va_uid = de->de_uid; 415 vap->va_gid = de->de_gid; 416 vap->va_mode = de->de_mode; 417 if (vp->v_type == VLNK) 418 vap->va_size = strlen(de->de_symlink); 419 else if (vp->v_type == VDIR) 420 vap->va_size = vap->va_bytes = DEV_BSIZE; 421 else 422 vap->va_size = 0; 423 if (vp->v_type != VDIR) 424 vap->va_bytes = 0; 425 vap->va_blocksize = DEV_BSIZE; 426 vap->va_type = vp->v_type; 427 428 #define fix(aa) \ 429 do { \ 430 if ((aa).tv_sec <= 3600) { \ 431 (aa).tv_sec = boottime.tv_sec; \ 432 (aa).tv_nsec = boottime.tv_usec * 1000; \ 433 } \ 434 } while (0) 435 436 if (vp->v_type != VCHR) { 437 fix(de->de_atime); 438 vap->va_atime = de->de_atime; 439 fix(de->de_mtime); 440 vap->va_mtime = de->de_mtime; 441 fix(de->de_ctime); 442 vap->va_ctime = de->de_ctime; 443 } else { 444 dev = vp->v_rdev; 445 fix(dev->si_atime); 446 vap->va_atime = dev->si_atime; 447 fix(dev->si_mtime); 448 vap->va_mtime = dev->si_mtime; 449 fix(dev->si_ctime); 450 vap->va_ctime = dev->si_ctime; 451 452 vap->va_rdev = dev->si_priv->cdp_inode; 453 } 454 vap->va_gen = 0; 455 vap->va_flags = 0; 456 vap->va_nlink = de->de_links; 457 vap->va_fileid = de->de_inode; 458 459 return (error); 460 } 461 462 /* ARGSUSED */ 463 static int 464 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 465 { 466 struct cdev *dev; 467 struct cdevsw *dsw; 468 struct vnode *vp; 469 struct vnode *vpold; 470 int error, i; 471 const char *p; 472 struct fiodgname_arg *fgn; 473 474 error = devfs_fp_check(fp, &dev, &dsw); 475 if (error) 476 return (error); 477 478 if (com == FIODTYPE) { 479 *(int *)data = dsw->d_flags & D_TYPEMASK; 480 dev_relthread(dev); 481 return (0); 482 } else if (com == FIODGNAME) { 483 fgn = data; 484 p = devtoname(dev); 485 i = strlen(p) + 1; 486 if (i > fgn->len) 487 error = EINVAL; 488 else 489 error = copyout(p, fgn->buf, i); 490 dev_relthread(dev); 491 return (error); 492 } 493 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td); 494 dev_relthread(dev); 495 if (error == ENOIOCTL) 496 error = ENOTTY; 497 if (error == 0 && com == TIOCSCTTY) { 498 vp = fp->f_vnode; 499 500 /* Do nothing if reassigning same control tty */ 501 sx_slock(&proctree_lock); 502 if (td->td_proc->p_session->s_ttyvp == vp) { 503 sx_sunlock(&proctree_lock); 504 return (0); 505 } 506 507 mtx_lock(&Giant); /* XXX TTY */ 508 509 vpold = td->td_proc->p_session->s_ttyvp; 510 VREF(vp); 511 SESS_LOCK(td->td_proc->p_session); 512 td->td_proc->p_session->s_ttyvp = vp; 513 SESS_UNLOCK(td->td_proc->p_session); 514 515 sx_sunlock(&proctree_lock); 516 517 /* Get rid of reference to old control tty */ 518 if (vpold) 519 vrele(vpold); 520 mtx_unlock(&Giant); /* XXX TTY */ 521 } 522 return (error); 523 } 524 525 /* ARGSUSED */ 526 static int 527 devfs_kqfilter_f(struct file *fp, struct knote *kn) 528 { 529 struct cdev *dev; 530 struct cdevsw *dsw; 531 int error; 532 533 error = devfs_fp_check(fp, &dev, &dsw); 534 if (error) 535 return (error); 536 error = dsw->d_kqfilter(dev, kn); 537 dev_relthread(dev); 538 return (error); 539 } 540 541 static int 542 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 543 { 544 struct componentname *cnp; 545 struct vnode *dvp, **vpp; 546 struct thread *td; 547 struct devfs_dirent *de, *dd; 548 struct devfs_dirent **dde; 549 struct devfs_mount *dmp; 550 struct cdev *cdev; 551 int error, flags, nameiop; 552 char specname[SPECNAMELEN + 1], *pname; 553 554 cnp = ap->a_cnp; 555 vpp = ap->a_vpp; 556 dvp = ap->a_dvp; 557 pname = cnp->cn_nameptr; 558 td = cnp->cn_thread; 559 flags = cnp->cn_flags; 560 nameiop = cnp->cn_nameiop; 561 dmp = VFSTODEVFS(dvp->v_mount); 562 dd = dvp->v_data; 563 *vpp = NULLVP; 564 565 if ((flags & ISLASTCN) && nameiop == RENAME) 566 return (EOPNOTSUPP); 567 568 if (dvp->v_type != VDIR) 569 return (ENOTDIR); 570 571 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 572 return (EIO); 573 574 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 575 if (error) 576 return (error); 577 578 if (cnp->cn_namelen == 1 && *pname == '.') { 579 if ((flags & ISLASTCN) && nameiop != LOOKUP) 580 return (EINVAL); 581 *vpp = dvp; 582 VREF(dvp); 583 return (0); 584 } 585 586 if (flags & ISDOTDOT) { 587 if ((flags & ISLASTCN) && nameiop != LOOKUP) 588 return (EINVAL); 589 VOP_UNLOCK(dvp, 0, td); 590 de = TAILQ_FIRST(&dd->de_dlist); /* "." */ 591 de = TAILQ_NEXT(de, de_list); /* ".." */ 592 de = de->de_dir; 593 error = devfs_allocv(de, dvp->v_mount, vpp, td); 594 *dm_unlock = 0; 595 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 596 return (error); 597 } 598 599 DEVFS_DMP_HOLD(dmp); 600 devfs_populate(dmp); 601 if (DEVFS_DMP_DROP(dmp)) { 602 *dm_unlock = 0; 603 sx_xunlock(&dmp->dm_lock); 604 devfs_unmount_final(dmp); 605 return (ENOENT); 606 } 607 dd = dvp->v_data; 608 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen); 609 while (de == NULL) { /* While(...) so we can use break */ 610 611 if (nameiop == DELETE) 612 return (ENOENT); 613 614 /* 615 * OK, we didn't have an entry for the name we were asked for 616 * so we try to see if anybody can create it on demand. 617 */ 618 pname = devfs_fqpn(specname, dvp, cnp); 619 if (pname == NULL) 620 break; 621 622 cdev = NULL; 623 DEVFS_DMP_HOLD(dmp); 624 sx_xunlock(&dmp->dm_lock); 625 sx_slock(&clone_drain_lock); 626 EVENTHANDLER_INVOKE(dev_clone, 627 td->td_ucred, pname, strlen(pname), &cdev); 628 sx_sunlock(&clone_drain_lock); 629 sx_xlock(&dmp->dm_lock); 630 if (DEVFS_DMP_DROP(dmp)) { 631 *dm_unlock = 0; 632 sx_xunlock(&dmp->dm_lock); 633 devfs_unmount_final(dmp); 634 return (ENOENT); 635 } 636 if (cdev == NULL) 637 break; 638 639 DEVFS_DMP_HOLD(dmp); 640 devfs_populate(dmp); 641 if (DEVFS_DMP_DROP(dmp)) { 642 *dm_unlock = 0; 643 sx_xunlock(&dmp->dm_lock); 644 devfs_unmount_final(dmp); 645 return (ENOENT); 646 } 647 648 dev_lock(); 649 dde = &cdev->si_priv->cdp_dirents[dmp->dm_idx]; 650 if (dde != NULL && *dde != NULL) 651 de = *dde; 652 dev_unlock(); 653 dev_rel(cdev); 654 break; 655 } 656 657 if (de == NULL || de->de_flags & DE_WHITEOUT) { 658 if ((nameiop == CREATE || nameiop == RENAME) && 659 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 660 cnp->cn_flags |= SAVENAME; 661 return (EJUSTRETURN); 662 } 663 return (ENOENT); 664 } 665 666 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 667 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 668 if (error) 669 return (error); 670 if (*vpp == dvp) { 671 VREF(dvp); 672 *vpp = dvp; 673 return (0); 674 } 675 } 676 error = devfs_allocv(de, dvp->v_mount, vpp, td); 677 *dm_unlock = 0; 678 return (error); 679 } 680 681 static int 682 devfs_lookup(struct vop_lookup_args *ap) 683 { 684 int j; 685 struct devfs_mount *dmp; 686 int dm_unlock; 687 688 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 689 dm_unlock = 1; 690 sx_xlock(&dmp->dm_lock); 691 j = devfs_lookupx(ap, &dm_unlock); 692 if (dm_unlock == 1) 693 sx_xunlock(&dmp->dm_lock); 694 return (j); 695 } 696 697 static int 698 devfs_mknod(struct vop_mknod_args *ap) 699 { 700 struct componentname *cnp; 701 struct vnode *dvp, **vpp; 702 struct thread *td; 703 struct devfs_dirent *dd, *de; 704 struct devfs_mount *dmp; 705 int error; 706 707 /* 708 * The only type of node we should be creating here is a 709 * character device, for anything else return EOPNOTSUPP. 710 */ 711 if (ap->a_vap->va_type != VCHR) 712 return (EOPNOTSUPP); 713 dvp = ap->a_dvp; 714 dmp = VFSTODEVFS(dvp->v_mount); 715 716 cnp = ap->a_cnp; 717 vpp = ap->a_vpp; 718 td = cnp->cn_thread; 719 dd = dvp->v_data; 720 721 error = ENOENT; 722 sx_xlock(&dmp->dm_lock); 723 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 724 if (cnp->cn_namelen != de->de_dirent->d_namlen) 725 continue; 726 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 727 de->de_dirent->d_namlen) != 0) 728 continue; 729 if (de->de_flags & DE_WHITEOUT) 730 break; 731 goto notfound; 732 } 733 if (de == NULL) 734 goto notfound; 735 de->de_flags &= ~DE_WHITEOUT; 736 error = devfs_allocv(de, dvp->v_mount, vpp, td); 737 return (error); 738 notfound: 739 sx_xunlock(&dmp->dm_lock); 740 return (error); 741 } 742 743 /* ARGSUSED */ 744 static int 745 devfs_open(struct vop_open_args *ap) 746 { 747 struct thread *td = ap->a_td; 748 struct vnode *vp = ap->a_vp; 749 struct cdev *dev = vp->v_rdev; 750 struct file *fp = ap->a_fp; 751 int error; 752 struct cdevsw *dsw; 753 754 if (vp->v_type == VBLK) 755 return (ENXIO); 756 757 if (dev == NULL) 758 return (ENXIO); 759 760 /* Make this field valid before any I/O in d_open. */ 761 if (dev->si_iosize_max == 0) 762 dev->si_iosize_max = DFLTPHYS; 763 764 dsw = dev_refthread(dev); 765 if (dsw == NULL) 766 return (ENXIO); 767 768 /* XXX: Special casing of ttys for deadfs. Probably redundant. */ 769 if (dsw->d_flags & D_TTY) 770 vp->v_vflag |= VV_ISTTY; 771 772 VOP_UNLOCK(vp, 0, td); 773 774 if(!(dsw->d_flags & D_NEEDGIANT)) { 775 DROP_GIANT(); 776 if (dsw->d_fdopen != NULL) 777 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 778 else 779 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 780 PICKUP_GIANT(); 781 } else { 782 if (dsw->d_fdopen != NULL) 783 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 784 else 785 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 786 } 787 788 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 789 790 dev_relthread(dev); 791 792 if (error) 793 return (error); 794 795 #if 0 /* /dev/console */ 796 KASSERT(fp != NULL, 797 ("Could not vnode bypass device on NULL fp")); 798 #else 799 if(fp == NULL) 800 return (error); 801 #endif 802 FILE_LOCK(fp); 803 KASSERT(fp->f_ops == &badfileops, 804 ("Could not vnode bypass device on fdops %p", fp->f_ops)); 805 fp->f_data = dev; 806 fp->f_ops = &devfs_ops_f; 807 FILE_UNLOCK(fp); 808 return (error); 809 } 810 811 static int 812 devfs_pathconf(struct vop_pathconf_args *ap) 813 { 814 815 switch (ap->a_name) { 816 case _PC_MAC_PRESENT: 817 #ifdef MAC 818 /* 819 * If MAC is enabled, devfs automatically supports 820 * trivial non-persistant label storage. 821 */ 822 *ap->a_retval = 1; 823 #else 824 *ap->a_retval = 0; 825 #endif 826 return (0); 827 default: 828 return (vop_stdpathconf(ap)); 829 } 830 /* NOTREACHED */ 831 } 832 833 /* ARGSUSED */ 834 static int 835 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 836 { 837 struct cdev *dev; 838 struct cdevsw *dsw; 839 int error; 840 841 error = devfs_fp_check(fp, &dev, &dsw); 842 if (error) 843 return (error); 844 error = dsw->d_poll(dev, events, td); 845 dev_relthread(dev); 846 return(error); 847 } 848 849 /* 850 * Print out the contents of a special device vnode. 851 */ 852 static int 853 devfs_print(struct vop_print_args *ap) 854 { 855 856 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 857 return (0); 858 } 859 860 /* ARGSUSED */ 861 static int 862 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 863 { 864 struct cdev *dev; 865 int ioflag, error, resid; 866 struct cdevsw *dsw; 867 868 error = devfs_fp_check(fp, &dev, &dsw); 869 if (error) 870 return (error); 871 resid = uio->uio_resid; 872 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 873 if (ioflag & O_DIRECT) 874 ioflag |= IO_DIRECT; 875 876 if ((flags & FOF_OFFSET) == 0) 877 uio->uio_offset = fp->f_offset; 878 879 error = dsw->d_read(dev, uio, ioflag); 880 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 881 vfs_timestamp(&dev->si_atime); 882 dev_relthread(dev); 883 884 if ((flags & FOF_OFFSET) == 0) 885 fp->f_offset = uio->uio_offset; 886 fp->f_nextoff = uio->uio_offset; 887 return (error); 888 } 889 890 static int 891 devfs_readdir(struct vop_readdir_args *ap) 892 { 893 int error; 894 struct uio *uio; 895 struct dirent *dp; 896 struct devfs_dirent *dd; 897 struct devfs_dirent *de; 898 struct devfs_mount *dmp; 899 off_t off, oldoff; 900 int *tmp_ncookies = NULL; 901 902 if (ap->a_vp->v_type != VDIR) 903 return (ENOTDIR); 904 905 uio = ap->a_uio; 906 if (uio->uio_offset < 0) 907 return (EINVAL); 908 909 /* 910 * XXX: This is a temporary hack to get around this filesystem not 911 * supporting cookies. We store the location of the ncookies pointer 912 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 913 * and set the number of cookies to 0. We then set the pointer to 914 * NULL so that vfs_read_dirent doesn't try to call realloc() on 915 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 916 * pointer to its original location before returning to the caller. 917 */ 918 if (ap->a_ncookies != NULL) { 919 tmp_ncookies = ap->a_ncookies; 920 *ap->a_ncookies = 0; 921 ap->a_ncookies = NULL; 922 } 923 924 dmp = VFSTODEVFS(ap->a_vp->v_mount); 925 sx_xlock(&dmp->dm_lock); 926 DEVFS_DMP_HOLD(dmp); 927 devfs_populate(dmp); 928 if (DEVFS_DMP_DROP(dmp)) { 929 sx_xunlock(&dmp->dm_lock); 930 devfs_unmount_final(dmp); 931 if (tmp_ncookies != NULL) 932 ap->a_ncookies = tmp_ncookies; 933 return (EIO); 934 } 935 error = 0; 936 de = ap->a_vp->v_data; 937 off = 0; 938 oldoff = uio->uio_offset; 939 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 940 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 941 if (dd->de_flags & DE_WHITEOUT) 942 continue; 943 if (dd->de_dirent->d_type == DT_DIR) 944 de = dd->de_dir; 945 else 946 de = dd; 947 dp = dd->de_dirent; 948 if (dp->d_reclen > uio->uio_resid) 949 break; 950 dp->d_fileno = de->de_inode; 951 if (off >= uio->uio_offset) { 952 error = vfs_read_dirent(ap, dp, off); 953 if (error) 954 break; 955 } 956 off += dp->d_reclen; 957 } 958 sx_xunlock(&dmp->dm_lock); 959 uio->uio_offset = off; 960 961 /* 962 * Restore ap->a_ncookies if it wasn't originally NULL in the first 963 * place. 964 */ 965 if (tmp_ncookies != NULL) 966 ap->a_ncookies = tmp_ncookies; 967 968 return (error); 969 } 970 971 static int 972 devfs_readlink(struct vop_readlink_args *ap) 973 { 974 struct devfs_dirent *de; 975 976 de = ap->a_vp->v_data; 977 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 978 } 979 980 static int 981 devfs_reclaim(struct vop_reclaim_args *ap) 982 { 983 struct vnode *vp = ap->a_vp; 984 struct devfs_dirent *de; 985 struct cdev *dev; 986 987 mtx_lock(&devfs_de_interlock); 988 de = vp->v_data; 989 if (de != NULL) { 990 de->de_vnode = NULL; 991 vp->v_data = NULL; 992 } 993 mtx_unlock(&devfs_de_interlock); 994 995 vnode_destroy_vobject(vp); 996 997 dev_lock(); 998 dev = vp->v_rdev; 999 vp->v_rdev = NULL; 1000 1001 if (dev == NULL) { 1002 dev_unlock(); 1003 return (0); 1004 } 1005 1006 dev->si_usecount -= vp->v_usecount; 1007 dev_unlock(); 1008 dev_rel(dev); 1009 return (0); 1010 } 1011 1012 static int 1013 devfs_remove(struct vop_remove_args *ap) 1014 { 1015 struct vnode *vp = ap->a_vp; 1016 struct devfs_dirent *dd; 1017 struct devfs_dirent *de; 1018 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1019 1020 sx_xlock(&dmp->dm_lock); 1021 dd = ap->a_dvp->v_data; 1022 de = vp->v_data; 1023 if (de->de_cdp == NULL) { 1024 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1025 devfs_delete(dmp, de, 1); 1026 } else { 1027 de->de_flags |= DE_WHITEOUT; 1028 } 1029 sx_xunlock(&dmp->dm_lock); 1030 return (0); 1031 } 1032 1033 /* 1034 * Revoke is called on a tty when a terminal session ends. The vnode 1035 * is orphaned by setting v_op to deadfs so we need to let go of it 1036 * as well so that we create a new one next time around. 1037 * 1038 */ 1039 static int 1040 devfs_revoke(struct vop_revoke_args *ap) 1041 { 1042 struct vnode *vp = ap->a_vp, *vp2; 1043 struct cdev *dev; 1044 struct cdev_priv *cdp; 1045 struct devfs_dirent *de; 1046 int i; 1047 1048 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1049 1050 dev = vp->v_rdev; 1051 cdp = dev->si_priv; 1052 1053 dev_lock(); 1054 cdp->cdp_inuse++; 1055 dev_unlock(); 1056 1057 vhold(vp); 1058 vgone(vp); 1059 vdrop(vp); 1060 1061 VOP_UNLOCK(vp,0,curthread); 1062 loop: 1063 for (;;) { 1064 mtx_lock(&devfs_de_interlock); 1065 dev_lock(); 1066 vp2 = NULL; 1067 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1068 de = cdp->cdp_dirents[i]; 1069 if (de == NULL) 1070 continue; 1071 1072 vp2 = de->de_vnode; 1073 if (vp2 != NULL) { 1074 dev_unlock(); 1075 VI_LOCK(vp2); 1076 mtx_unlock(&devfs_de_interlock); 1077 if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK, 1078 curthread)) 1079 goto loop; 1080 vhold(vp2); 1081 vgone(vp2); 1082 vdrop(vp2); 1083 vput(vp2); 1084 break; 1085 } 1086 } 1087 if (vp2 != NULL) { 1088 continue; 1089 } 1090 dev_unlock(); 1091 mtx_unlock(&devfs_de_interlock); 1092 break; 1093 } 1094 dev_lock(); 1095 cdp->cdp_inuse--; 1096 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1097 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1098 dev_unlock(); 1099 dev_rel(&cdp->cdp_c); 1100 } else 1101 dev_unlock(); 1102 1103 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curthread); 1104 return (0); 1105 } 1106 1107 static int 1108 devfs_rioctl(struct vop_ioctl_args *ap) 1109 { 1110 int error; 1111 struct devfs_mount *dmp; 1112 1113 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1114 sx_xlock(&dmp->dm_lock); 1115 DEVFS_DMP_HOLD(dmp); 1116 devfs_populate(dmp); 1117 if (DEVFS_DMP_DROP(dmp)) { 1118 sx_xunlock(&dmp->dm_lock); 1119 devfs_unmount_final(dmp); 1120 return (ENOENT); 1121 } 1122 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1123 sx_xunlock(&dmp->dm_lock); 1124 return (error); 1125 } 1126 1127 static int 1128 devfs_rread(struct vop_read_args *ap) 1129 { 1130 1131 if (ap->a_vp->v_type != VDIR) 1132 return (EINVAL); 1133 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1134 } 1135 1136 static int 1137 devfs_setattr(struct vop_setattr_args *ap) 1138 { 1139 struct devfs_dirent *de; 1140 struct vattr *vap; 1141 struct vnode *vp; 1142 int c, error; 1143 uid_t uid; 1144 gid_t gid; 1145 1146 vap = ap->a_vap; 1147 vp = ap->a_vp; 1148 if ((vap->va_type != VNON) || 1149 (vap->va_nlink != VNOVAL) || 1150 (vap->va_fsid != VNOVAL) || 1151 (vap->va_fileid != VNOVAL) || 1152 (vap->va_blocksize != VNOVAL) || 1153 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1154 (vap->va_rdev != VNOVAL) || 1155 ((int)vap->va_bytes != VNOVAL) || 1156 (vap->va_gen != VNOVAL)) { 1157 return (EINVAL); 1158 } 1159 1160 de = vp->v_data; 1161 if (vp->v_type == VDIR) 1162 de = de->de_dir; 1163 1164 error = c = 0; 1165 if (vap->va_uid == (uid_t)VNOVAL) 1166 uid = de->de_uid; 1167 else 1168 uid = vap->va_uid; 1169 if (vap->va_gid == (gid_t)VNOVAL) 1170 gid = de->de_gid; 1171 else 1172 gid = vap->va_gid; 1173 if (uid != de->de_uid || gid != de->de_gid) { 1174 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1175 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1176 error = priv_check(ap->a_td, PRIV_VFS_CHOWN); 1177 if (error) 1178 return (error); 1179 } 1180 de->de_uid = uid; 1181 de->de_gid = gid; 1182 c = 1; 1183 } 1184 1185 if (vap->va_mode != (mode_t)VNOVAL) { 1186 if (ap->a_cred->cr_uid != de->de_uid) { 1187 error = priv_check(ap->a_td, PRIV_VFS_ADMIN); 1188 if (error) 1189 return (error); 1190 } 1191 de->de_mode = vap->va_mode; 1192 c = 1; 1193 } 1194 1195 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1196 /* See the comment in ufs_vnops::ufs_setattr(). */ 1197 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) && 1198 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1199 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td)))) 1200 return (error); 1201 if (vap->va_atime.tv_sec != VNOVAL) { 1202 if (vp->v_type == VCHR) 1203 vp->v_rdev->si_atime = vap->va_atime; 1204 else 1205 de->de_atime = vap->va_atime; 1206 } 1207 if (vap->va_mtime.tv_sec != VNOVAL) { 1208 if (vp->v_type == VCHR) 1209 vp->v_rdev->si_mtime = vap->va_mtime; 1210 else 1211 de->de_mtime = vap->va_mtime; 1212 } 1213 c = 1; 1214 } 1215 1216 if (c) { 1217 if (vp->v_type == VCHR) 1218 vfs_timestamp(&vp->v_rdev->si_ctime); 1219 else 1220 vfs_timestamp(&de->de_mtime); 1221 } 1222 return (0); 1223 } 1224 1225 #ifdef MAC 1226 static int 1227 devfs_setlabel(struct vop_setlabel_args *ap) 1228 { 1229 struct vnode *vp; 1230 struct devfs_dirent *de; 1231 1232 vp = ap->a_vp; 1233 de = vp->v_data; 1234 1235 mac_relabel_vnode(ap->a_cred, vp, ap->a_label); 1236 mac_update_devfs(vp->v_mount, de, vp); 1237 1238 return (0); 1239 } 1240 #endif 1241 1242 static int 1243 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) 1244 { 1245 1246 return (vnops.fo_stat(fp, sb, cred, td)); 1247 } 1248 1249 static int 1250 devfs_symlink(struct vop_symlink_args *ap) 1251 { 1252 int i, error; 1253 struct devfs_dirent *dd; 1254 struct devfs_dirent *de; 1255 struct devfs_mount *dmp; 1256 struct thread *td; 1257 1258 td = ap->a_cnp->cn_thread; 1259 KASSERT(td == curthread, ("devfs_symlink: td != curthread")); 1260 1261 error = priv_check(td, PRIV_DEVFS_SYMLINK); 1262 if (error) 1263 return(error); 1264 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1265 dd = ap->a_dvp->v_data; 1266 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1267 de->de_uid = 0; 1268 de->de_gid = 0; 1269 de->de_mode = 0755; 1270 de->de_inode = alloc_unr(devfs_inos); 1271 de->de_dirent->d_type = DT_LNK; 1272 i = strlen(ap->a_target) + 1; 1273 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1274 bcopy(ap->a_target, de->de_symlink, i); 1275 sx_xlock(&dmp->dm_lock); 1276 #ifdef MAC 1277 mac_create_devfs_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1278 #endif 1279 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 1280 return (devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, td)); 1281 } 1282 1283 /* ARGSUSED */ 1284 static int 1285 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 1286 { 1287 struct cdev *dev; 1288 int error, ioflag, resid; 1289 struct cdevsw *dsw; 1290 1291 error = devfs_fp_check(fp, &dev, &dsw); 1292 if (error) 1293 return (error); 1294 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1295 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1296 if (ioflag & O_DIRECT) 1297 ioflag |= IO_DIRECT; 1298 if ((flags & FOF_OFFSET) == 0) 1299 uio->uio_offset = fp->f_offset; 1300 1301 resid = uio->uio_resid; 1302 1303 error = dsw->d_write(dev, uio, ioflag); 1304 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1305 vfs_timestamp(&dev->si_ctime); 1306 dev->si_mtime = dev->si_ctime; 1307 } 1308 dev_relthread(dev); 1309 1310 if ((flags & FOF_OFFSET) == 0) 1311 fp->f_offset = uio->uio_offset; 1312 fp->f_nextoff = uio->uio_offset; 1313 return (error); 1314 } 1315 1316 dev_t 1317 dev2udev(struct cdev *x) 1318 { 1319 if (x == NULL) 1320 return (NODEV); 1321 return (x->si_priv->cdp_inode); 1322 } 1323 1324 static struct fileops devfs_ops_f = { 1325 .fo_read = devfs_read_f, 1326 .fo_write = devfs_write_f, 1327 .fo_ioctl = devfs_ioctl_f, 1328 .fo_poll = devfs_poll_f, 1329 .fo_kqfilter = devfs_kqfilter_f, 1330 .fo_stat = devfs_stat_f, 1331 .fo_close = devfs_close_f, 1332 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 1333 }; 1334 1335 static struct vop_vector devfs_vnodeops = { 1336 .vop_default = &default_vnodeops, 1337 1338 .vop_access = devfs_access, 1339 .vop_getattr = devfs_getattr, 1340 .vop_ioctl = devfs_rioctl, 1341 .vop_lookup = devfs_lookup, 1342 .vop_mknod = devfs_mknod, 1343 .vop_pathconf = devfs_pathconf, 1344 .vop_read = devfs_rread, 1345 .vop_readdir = devfs_readdir, 1346 .vop_readlink = devfs_readlink, 1347 .vop_reclaim = devfs_reclaim, 1348 .vop_remove = devfs_remove, 1349 .vop_revoke = devfs_revoke, 1350 .vop_setattr = devfs_setattr, 1351 #ifdef MAC 1352 .vop_setlabel = devfs_setlabel, 1353 #endif 1354 .vop_symlink = devfs_symlink, 1355 }; 1356 1357 static struct vop_vector devfs_specops = { 1358 .vop_default = &default_vnodeops, 1359 1360 .vop_access = devfs_access, 1361 .vop_advlock = devfs_advlock, 1362 .vop_bmap = VOP_PANIC, 1363 .vop_close = devfs_close, 1364 .vop_create = VOP_PANIC, 1365 .vop_fsync = devfs_fsync, 1366 .vop_getattr = devfs_getattr, 1367 .vop_lease = VOP_NULL, 1368 .vop_link = VOP_PANIC, 1369 .vop_mkdir = VOP_PANIC, 1370 .vop_mknod = VOP_PANIC, 1371 .vop_open = devfs_open, 1372 .vop_pathconf = devfs_pathconf, 1373 .vop_print = devfs_print, 1374 .vop_read = VOP_PANIC, 1375 .vop_readdir = VOP_PANIC, 1376 .vop_readlink = VOP_PANIC, 1377 .vop_reallocblks = VOP_PANIC, 1378 .vop_reclaim = devfs_reclaim, 1379 .vop_remove = devfs_remove, 1380 .vop_rename = VOP_PANIC, 1381 .vop_revoke = devfs_revoke, 1382 .vop_rmdir = VOP_PANIC, 1383 .vop_setattr = devfs_setattr, 1384 #ifdef MAC 1385 .vop_setlabel = devfs_setlabel, 1386 #endif 1387 .vop_strategy = VOP_PANIC, 1388 .vop_symlink = VOP_PANIC, 1389 .vop_write = VOP_PANIC, 1390 }; 1391 1392 /* 1393 * Our calling convention to the device drivers used to be that we passed 1394 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 1395 * flags instead since that's what open(), close() and ioctl() takes and 1396 * we don't really want vnode.h in device drivers. 1397 * We solved the source compatibility by redefining some vnode flags to 1398 * be the same as the fcntl ones and by sending down the bitwise OR of 1399 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 1400 * pulls the rug out under this. 1401 */ 1402 CTASSERT(O_NONBLOCK == IO_NDELAY); 1403 CTASSERT(O_FSYNC == IO_SYNC); 1404