Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/devfs/devfs_vnops.c
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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, td); 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_associate_vnode_devfs(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, td); 364 VOP_UNLOCK(vp, 0, td); 365 KASSERT(dev->si_refcount > 0, 366 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 367 if (!(dsw->d_flags & D_NEEDGIANT)) { 368 DROP_GIANT(); 369 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 370 PICKUP_GIANT(); 371 } else { 372 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 373 } 374 dev_relthread(dev); 375 vn_lock(vp, vp_locked | LK_RETRY, td); 376 vdrop(vp); 377 return (error); 378 } 379 380 static int 381 devfs_close_f(struct file *fp, struct thread *td) 382 { 383 384 return (vnops.fo_close(fp, td)); 385 } 386 387 /* ARGSUSED */ 388 static int 389 devfs_fsync(struct vop_fsync_args *ap) 390 { 391 if (!vn_isdisk(ap->a_vp, NULL)) 392 return (0); 393 394 return (vop_stdfsync(ap)); 395 } 396 397 static int 398 devfs_getattr(struct vop_getattr_args *ap) 399 { 400 struct vnode *vp = ap->a_vp; 401 struct vattr *vap = ap->a_vap; 402 int error = 0; 403 struct devfs_dirent *de; 404 struct cdev *dev; 405 406 de = vp->v_data; 407 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 408 if (vp->v_type == VDIR) { 409 de = de->de_dir; 410 KASSERT(de != NULL, 411 ("Null dir dirent in devfs_getattr vp=%p", vp)); 412 } 413 bzero((caddr_t) vap, sizeof(*vap)); 414 vattr_null(vap); 415 vap->va_uid = de->de_uid; 416 vap->va_gid = de->de_gid; 417 vap->va_mode = de->de_mode; 418 if (vp->v_type == VLNK) 419 vap->va_size = strlen(de->de_symlink); 420 else if (vp->v_type == VDIR) 421 vap->va_size = vap->va_bytes = DEV_BSIZE; 422 else 423 vap->va_size = 0; 424 if (vp->v_type != VDIR) 425 vap->va_bytes = 0; 426 vap->va_blocksize = DEV_BSIZE; 427 vap->va_type = vp->v_type; 428 429 #define fix(aa) \ 430 do { \ 431 if ((aa).tv_sec <= 3600) { \ 432 (aa).tv_sec = boottime.tv_sec; \ 433 (aa).tv_nsec = boottime.tv_usec * 1000; \ 434 } \ 435 } while (0) 436 437 if (vp->v_type != VCHR) { 438 fix(de->de_atime); 439 vap->va_atime = de->de_atime; 440 fix(de->de_mtime); 441 vap->va_mtime = de->de_mtime; 442 fix(de->de_ctime); 443 vap->va_ctime = de->de_ctime; 444 } else { 445 dev = vp->v_rdev; 446 fix(dev->si_atime); 447 vap->va_atime = dev->si_atime; 448 fix(dev->si_mtime); 449 vap->va_mtime = dev->si_mtime; 450 fix(dev->si_ctime); 451 vap->va_ctime = dev->si_ctime; 452 453 vap->va_rdev = dev->si_priv->cdp_inode; 454 } 455 vap->va_gen = 0; 456 vap->va_flags = 0; 457 vap->va_nlink = de->de_links; 458 vap->va_fileid = de->de_inode; 459 460 return (error); 461 } 462 463 /* ARGSUSED */ 464 static int 465 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 466 { 467 struct cdev *dev; 468 struct cdevsw *dsw; 469 struct vnode *vp; 470 struct vnode *vpold; 471 int error, i; 472 const char *p; 473 struct fiodgname_arg *fgn; 474 475 error = devfs_fp_check(fp, &dev, &dsw); 476 if (error) 477 return (error); 478 479 if (com == FIODTYPE) { 480 *(int *)data = dsw->d_flags & D_TYPEMASK; 481 dev_relthread(dev); 482 return (0); 483 } else if (com == FIODGNAME) { 484 fgn = data; 485 p = devtoname(dev); 486 i = strlen(p) + 1; 487 if (i > fgn->len) 488 error = EINVAL; 489 else 490 error = copyout(p, fgn->buf, i); 491 dev_relthread(dev); 492 return (error); 493 } 494 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td); 495 dev_relthread(dev); 496 if (error == ENOIOCTL) 497 error = ENOTTY; 498 if (error == 0 && com == TIOCSCTTY) { 499 vp = fp->f_vnode; 500 501 /* Do nothing if reassigning same control tty */ 502 sx_slock(&proctree_lock); 503 if (td->td_proc->p_session->s_ttyvp == vp) { 504 sx_sunlock(&proctree_lock); 505 return (0); 506 } 507 508 mtx_lock(&Giant); /* XXX TTY */ 509 510 vpold = td->td_proc->p_session->s_ttyvp; 511 VREF(vp); 512 SESS_LOCK(td->td_proc->p_session); 513 td->td_proc->p_session->s_ttyvp = vp; 514 SESS_UNLOCK(td->td_proc->p_session); 515 516 sx_sunlock(&proctree_lock); 517 518 /* Get rid of reference to old control tty */ 519 if (vpold) 520 vrele(vpold); 521 mtx_unlock(&Giant); /* XXX TTY */ 522 } 523 return (error); 524 } 525 526 /* ARGSUSED */ 527 static int 528 devfs_kqfilter_f(struct file *fp, struct knote *kn) 529 { 530 struct cdev *dev; 531 struct cdevsw *dsw; 532 int error; 533 534 error = devfs_fp_check(fp, &dev, &dsw); 535 if (error) 536 return (error); 537 error = dsw->d_kqfilter(dev, kn); 538 dev_relthread(dev); 539 return (error); 540 } 541 542 static int 543 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 544 { 545 struct componentname *cnp; 546 struct vnode *dvp, **vpp; 547 struct thread *td; 548 struct devfs_dirent *de, *dd; 549 struct devfs_dirent **dde; 550 struct devfs_mount *dmp; 551 struct cdev *cdev; 552 int error, flags, nameiop; 553 char specname[SPECNAMELEN + 1], *pname; 554 555 cnp = ap->a_cnp; 556 vpp = ap->a_vpp; 557 dvp = ap->a_dvp; 558 pname = cnp->cn_nameptr; 559 td = cnp->cn_thread; 560 flags = cnp->cn_flags; 561 nameiop = cnp->cn_nameiop; 562 dmp = VFSTODEVFS(dvp->v_mount); 563 dd = dvp->v_data; 564 *vpp = NULLVP; 565 566 if ((flags & ISLASTCN) && nameiop == RENAME) 567 return (EOPNOTSUPP); 568 569 if (dvp->v_type != VDIR) 570 return (ENOTDIR); 571 572 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 573 return (EIO); 574 575 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 576 if (error) 577 return (error); 578 579 if (cnp->cn_namelen == 1 && *pname == '.') { 580 if ((flags & ISLASTCN) && nameiop != LOOKUP) 581 return (EINVAL); 582 *vpp = dvp; 583 VREF(dvp); 584 return (0); 585 } 586 587 if (flags & ISDOTDOT) { 588 if ((flags & ISLASTCN) && nameiop != LOOKUP) 589 return (EINVAL); 590 VOP_UNLOCK(dvp, 0, td); 591 de = TAILQ_FIRST(&dd->de_dlist); /* "." */ 592 de = TAILQ_NEXT(de, de_list); /* ".." */ 593 de = de->de_dir; 594 error = devfs_allocv(de, dvp->v_mount, vpp, td); 595 *dm_unlock = 0; 596 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 597 return (error); 598 } 599 600 DEVFS_DMP_HOLD(dmp); 601 devfs_populate(dmp); 602 if (DEVFS_DMP_DROP(dmp)) { 603 *dm_unlock = 0; 604 sx_xunlock(&dmp->dm_lock); 605 devfs_unmount_final(dmp); 606 return (ENOENT); 607 } 608 dd = dvp->v_data; 609 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen); 610 while (de == NULL) { /* While(...) so we can use break */ 611 612 if (nameiop == DELETE) 613 return (ENOENT); 614 615 /* 616 * OK, we didn't have an entry for the name we were asked for 617 * so we try to see if anybody can create it on demand. 618 */ 619 pname = devfs_fqpn(specname, dvp, cnp); 620 if (pname == NULL) 621 break; 622 623 cdev = NULL; 624 DEVFS_DMP_HOLD(dmp); 625 sx_xunlock(&dmp->dm_lock); 626 sx_slock(&clone_drain_lock); 627 EVENTHANDLER_INVOKE(dev_clone, 628 td->td_ucred, pname, strlen(pname), &cdev); 629 sx_sunlock(&clone_drain_lock); 630 sx_xlock(&dmp->dm_lock); 631 if (DEVFS_DMP_DROP(dmp)) { 632 *dm_unlock = 0; 633 sx_xunlock(&dmp->dm_lock); 634 devfs_unmount_final(dmp); 635 return (ENOENT); 636 } 637 if (cdev == NULL) 638 break; 639 640 DEVFS_DMP_HOLD(dmp); 641 devfs_populate(dmp); 642 if (DEVFS_DMP_DROP(dmp)) { 643 *dm_unlock = 0; 644 sx_xunlock(&dmp->dm_lock); 645 devfs_unmount_final(dmp); 646 return (ENOENT); 647 } 648 649 dev_lock(); 650 dde = &cdev->si_priv->cdp_dirents[dmp->dm_idx]; 651 if (dde != NULL && *dde != NULL) 652 de = *dde; 653 dev_unlock(); 654 dev_rel(cdev); 655 break; 656 } 657 658 if (de == NULL || de->de_flags & DE_WHITEOUT) { 659 if ((nameiop == CREATE || nameiop == RENAME) && 660 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 661 cnp->cn_flags |= SAVENAME; 662 return (EJUSTRETURN); 663 } 664 return (ENOENT); 665 } 666 667 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 668 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 669 if (error) 670 return (error); 671 if (*vpp == dvp) { 672 VREF(dvp); 673 *vpp = dvp; 674 return (0); 675 } 676 } 677 error = devfs_allocv(de, dvp->v_mount, vpp, td); 678 *dm_unlock = 0; 679 return (error); 680 } 681 682 static int 683 devfs_lookup(struct vop_lookup_args *ap) 684 { 685 int j; 686 struct devfs_mount *dmp; 687 int dm_unlock; 688 689 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 690 dm_unlock = 1; 691 sx_xlock(&dmp->dm_lock); 692 j = devfs_lookupx(ap, &dm_unlock); 693 if (dm_unlock == 1) 694 sx_xunlock(&dmp->dm_lock); 695 return (j); 696 } 697 698 static int 699 devfs_mknod(struct vop_mknod_args *ap) 700 { 701 struct componentname *cnp; 702 struct vnode *dvp, **vpp; 703 struct thread *td; 704 struct devfs_dirent *dd, *de; 705 struct devfs_mount *dmp; 706 int error; 707 708 /* 709 * The only type of node we should be creating here is a 710 * character device, for anything else return EOPNOTSUPP. 711 */ 712 if (ap->a_vap->va_type != VCHR) 713 return (EOPNOTSUPP); 714 dvp = ap->a_dvp; 715 dmp = VFSTODEVFS(dvp->v_mount); 716 717 cnp = ap->a_cnp; 718 vpp = ap->a_vpp; 719 td = cnp->cn_thread; 720 dd = dvp->v_data; 721 722 error = ENOENT; 723 sx_xlock(&dmp->dm_lock); 724 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 725 if (cnp->cn_namelen != de->de_dirent->d_namlen) 726 continue; 727 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 728 de->de_dirent->d_namlen) != 0) 729 continue; 730 if (de->de_flags & DE_WHITEOUT) 731 break; 732 goto notfound; 733 } 734 if (de == NULL) 735 goto notfound; 736 de->de_flags &= ~DE_WHITEOUT; 737 error = devfs_allocv(de, dvp->v_mount, vpp, td); 738 return (error); 739 notfound: 740 sx_xunlock(&dmp->dm_lock); 741 return (error); 742 } 743 744 /* ARGSUSED */ 745 static int 746 devfs_open(struct vop_open_args *ap) 747 { 748 struct thread *td = ap->a_td; 749 struct vnode *vp = ap->a_vp; 750 struct cdev *dev = vp->v_rdev; 751 struct file *fp = ap->a_fp; 752 int error; 753 struct cdevsw *dsw; 754 755 if (vp->v_type == VBLK) 756 return (ENXIO); 757 758 if (dev == NULL) 759 return (ENXIO); 760 761 /* Make this field valid before any I/O in d_open. */ 762 if (dev->si_iosize_max == 0) 763 dev->si_iosize_max = DFLTPHYS; 764 765 dsw = dev_refthread(dev); 766 if (dsw == NULL) 767 return (ENXIO); 768 769 /* XXX: Special casing of ttys for deadfs. Probably redundant. */ 770 if (dsw->d_flags & D_TTY) 771 vp->v_vflag |= VV_ISTTY; 772 773 VOP_UNLOCK(vp, 0, td); 774 775 if(!(dsw->d_flags & D_NEEDGIANT)) { 776 DROP_GIANT(); 777 if (dsw->d_fdopen != NULL) 778 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 779 else 780 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 781 PICKUP_GIANT(); 782 } else { 783 if (dsw->d_fdopen != NULL) 784 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 785 else 786 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 787 } 788 789 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 790 791 dev_relthread(dev); 792 793 if (error) 794 return (error); 795 796 #if 0 /* /dev/console */ 797 KASSERT(fp != NULL, 798 ("Could not vnode bypass device on NULL fp")); 799 #else 800 if(fp == NULL) 801 return (error); 802 #endif 803 FILE_LOCK(fp); 804 KASSERT(fp->f_ops == &badfileops, 805 ("Could not vnode bypass device on fdops %p", fp->f_ops)); 806 fp->f_data = dev; 807 fp->f_ops = &devfs_ops_f; 808 FILE_UNLOCK(fp); 809 return (error); 810 } 811 812 static int 813 devfs_pathconf(struct vop_pathconf_args *ap) 814 { 815 816 switch (ap->a_name) { 817 case _PC_MAC_PRESENT: 818 #ifdef MAC 819 /* 820 * If MAC is enabled, devfs automatically supports 821 * trivial non-persistant label storage. 822 */ 823 *ap->a_retval = 1; 824 #else 825 *ap->a_retval = 0; 826 #endif 827 return (0); 828 default: 829 return (vop_stdpathconf(ap)); 830 } 831 /* NOTREACHED */ 832 } 833 834 /* ARGSUSED */ 835 static int 836 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 837 { 838 struct cdev *dev; 839 struct cdevsw *dsw; 840 int error; 841 842 error = devfs_fp_check(fp, &dev, &dsw); 843 if (error) 844 return (error); 845 error = dsw->d_poll(dev, events, td); 846 dev_relthread(dev); 847 return(error); 848 } 849 850 /* 851 * Print out the contents of a special device vnode. 852 */ 853 static int 854 devfs_print(struct vop_print_args *ap) 855 { 856 857 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 858 return (0); 859 } 860 861 /* ARGSUSED */ 862 static int 863 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 864 { 865 struct cdev *dev; 866 int ioflag, error, resid; 867 struct cdevsw *dsw; 868 869 error = devfs_fp_check(fp, &dev, &dsw); 870 if (error) 871 return (error); 872 resid = uio->uio_resid; 873 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 874 if (ioflag & O_DIRECT) 875 ioflag |= IO_DIRECT; 876 877 if ((flags & FOF_OFFSET) == 0) 878 uio->uio_offset = fp->f_offset; 879 880 error = dsw->d_read(dev, uio, ioflag); 881 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 882 vfs_timestamp(&dev->si_atime); 883 dev_relthread(dev); 884 885 if ((flags & FOF_OFFSET) == 0) 886 fp->f_offset = uio->uio_offset; 887 fp->f_nextoff = uio->uio_offset; 888 return (error); 889 } 890 891 static int 892 devfs_readdir(struct vop_readdir_args *ap) 893 { 894 int error; 895 struct uio *uio; 896 struct dirent *dp; 897 struct devfs_dirent *dd; 898 struct devfs_dirent *de; 899 struct devfs_mount *dmp; 900 off_t off, oldoff; 901 int *tmp_ncookies = NULL; 902 903 if (ap->a_vp->v_type != VDIR) 904 return (ENOTDIR); 905 906 uio = ap->a_uio; 907 if (uio->uio_offset < 0) 908 return (EINVAL); 909 910 /* 911 * XXX: This is a temporary hack to get around this filesystem not 912 * supporting cookies. We store the location of the ncookies pointer 913 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 914 * and set the number of cookies to 0. We then set the pointer to 915 * NULL so that vfs_read_dirent doesn't try to call realloc() on 916 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 917 * pointer to its original location before returning to the caller. 918 */ 919 if (ap->a_ncookies != NULL) { 920 tmp_ncookies = ap->a_ncookies; 921 *ap->a_ncookies = 0; 922 ap->a_ncookies = NULL; 923 } 924 925 dmp = VFSTODEVFS(ap->a_vp->v_mount); 926 sx_xlock(&dmp->dm_lock); 927 DEVFS_DMP_HOLD(dmp); 928 devfs_populate(dmp); 929 if (DEVFS_DMP_DROP(dmp)) { 930 sx_xunlock(&dmp->dm_lock); 931 devfs_unmount_final(dmp); 932 if (tmp_ncookies != NULL) 933 ap->a_ncookies = tmp_ncookies; 934 return (EIO); 935 } 936 error = 0; 937 de = ap->a_vp->v_data; 938 off = 0; 939 oldoff = uio->uio_offset; 940 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 941 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 942 if (dd->de_flags & DE_WHITEOUT) 943 continue; 944 if (dd->de_dirent->d_type == DT_DIR) 945 de = dd->de_dir; 946 else 947 de = dd; 948 dp = dd->de_dirent; 949 if (dp->d_reclen > uio->uio_resid) 950 break; 951 dp->d_fileno = de->de_inode; 952 if (off >= uio->uio_offset) { 953 error = vfs_read_dirent(ap, dp, off); 954 if (error) 955 break; 956 } 957 off += dp->d_reclen; 958 } 959 sx_xunlock(&dmp->dm_lock); 960 uio->uio_offset = off; 961 962 /* 963 * Restore ap->a_ncookies if it wasn't originally NULL in the first 964 * place. 965 */ 966 if (tmp_ncookies != NULL) 967 ap->a_ncookies = tmp_ncookies; 968 969 return (error); 970 } 971 972 static int 973 devfs_readlink(struct vop_readlink_args *ap) 974 { 975 struct devfs_dirent *de; 976 977 de = ap->a_vp->v_data; 978 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 979 } 980 981 static int 982 devfs_reclaim(struct vop_reclaim_args *ap) 983 { 984 struct vnode *vp = ap->a_vp; 985 struct devfs_dirent *de; 986 struct cdev *dev; 987 988 mtx_lock(&devfs_de_interlock); 989 de = vp->v_data; 990 if (de != NULL) { 991 de->de_vnode = NULL; 992 vp->v_data = NULL; 993 } 994 mtx_unlock(&devfs_de_interlock); 995 996 vnode_destroy_vobject(vp); 997 998 VI_LOCK(vp); 999 dev_lock(); 1000 dev = vp->v_rdev; 1001 vp->v_rdev = NULL; 1002 1003 if (dev == NULL) { 1004 dev_unlock(); 1005 VI_UNLOCK(vp); 1006 return (0); 1007 } 1008 1009 dev->si_usecount -= vp->v_usecount; 1010 dev_unlock(); 1011 VI_UNLOCK(vp); 1012 dev_rel(dev); 1013 return (0); 1014 } 1015 1016 static int 1017 devfs_remove(struct vop_remove_args *ap) 1018 { 1019 struct vnode *vp = ap->a_vp; 1020 struct devfs_dirent *dd; 1021 struct devfs_dirent *de; 1022 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1023 1024 sx_xlock(&dmp->dm_lock); 1025 dd = ap->a_dvp->v_data; 1026 de = vp->v_data; 1027 if (de->de_cdp == NULL) { 1028 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1029 devfs_delete(dmp, de, 1); 1030 } else { 1031 de->de_flags |= DE_WHITEOUT; 1032 } 1033 sx_xunlock(&dmp->dm_lock); 1034 return (0); 1035 } 1036 1037 /* 1038 * Revoke is called on a tty when a terminal session ends. The vnode 1039 * is orphaned by setting v_op to deadfs so we need to let go of it 1040 * as well so that we create a new one next time around. 1041 * 1042 */ 1043 static int 1044 devfs_revoke(struct vop_revoke_args *ap) 1045 { 1046 struct vnode *vp = ap->a_vp, *vp2; 1047 struct cdev *dev; 1048 struct cdev_priv *cdp; 1049 struct devfs_dirent *de; 1050 int i; 1051 1052 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1053 1054 dev = vp->v_rdev; 1055 cdp = dev->si_priv; 1056 1057 dev_lock(); 1058 cdp->cdp_inuse++; 1059 dev_unlock(); 1060 1061 vhold(vp); 1062 vgone(vp); 1063 vdrop(vp); 1064 1065 VOP_UNLOCK(vp,0,curthread); 1066 loop: 1067 for (;;) { 1068 mtx_lock(&devfs_de_interlock); 1069 dev_lock(); 1070 vp2 = NULL; 1071 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1072 de = cdp->cdp_dirents[i]; 1073 if (de == NULL) 1074 continue; 1075 1076 vp2 = de->de_vnode; 1077 if (vp2 != NULL) { 1078 dev_unlock(); 1079 VI_LOCK(vp2); 1080 mtx_unlock(&devfs_de_interlock); 1081 if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK, 1082 curthread)) 1083 goto loop; 1084 vhold(vp2); 1085 vgone(vp2); 1086 vdrop(vp2); 1087 vput(vp2); 1088 break; 1089 } 1090 } 1091 if (vp2 != NULL) { 1092 continue; 1093 } 1094 dev_unlock(); 1095 mtx_unlock(&devfs_de_interlock); 1096 break; 1097 } 1098 dev_lock(); 1099 cdp->cdp_inuse--; 1100 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1101 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1102 dev_unlock(); 1103 dev_rel(&cdp->cdp_c); 1104 } else 1105 dev_unlock(); 1106 1107 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curthread); 1108 return (0); 1109 } 1110 1111 static int 1112 devfs_rioctl(struct vop_ioctl_args *ap) 1113 { 1114 int error; 1115 struct devfs_mount *dmp; 1116 1117 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1118 sx_xlock(&dmp->dm_lock); 1119 DEVFS_DMP_HOLD(dmp); 1120 devfs_populate(dmp); 1121 if (DEVFS_DMP_DROP(dmp)) { 1122 sx_xunlock(&dmp->dm_lock); 1123 devfs_unmount_final(dmp); 1124 return (ENOENT); 1125 } 1126 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1127 sx_xunlock(&dmp->dm_lock); 1128 return (error); 1129 } 1130 1131 static int 1132 devfs_rread(struct vop_read_args *ap) 1133 { 1134 1135 if (ap->a_vp->v_type != VDIR) 1136 return (EINVAL); 1137 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1138 } 1139 1140 static int 1141 devfs_setattr(struct vop_setattr_args *ap) 1142 { 1143 struct devfs_dirent *de; 1144 struct vattr *vap; 1145 struct vnode *vp; 1146 int c, error; 1147 uid_t uid; 1148 gid_t gid; 1149 1150 vap = ap->a_vap; 1151 vp = ap->a_vp; 1152 if ((vap->va_type != VNON) || 1153 (vap->va_nlink != VNOVAL) || 1154 (vap->va_fsid != VNOVAL) || 1155 (vap->va_fileid != VNOVAL) || 1156 (vap->va_blocksize != VNOVAL) || 1157 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1158 (vap->va_rdev != VNOVAL) || 1159 ((int)vap->va_bytes != VNOVAL) || 1160 (vap->va_gen != VNOVAL)) { 1161 return (EINVAL); 1162 } 1163 1164 de = vp->v_data; 1165 if (vp->v_type == VDIR) 1166 de = de->de_dir; 1167 1168 error = c = 0; 1169 if (vap->va_uid == (uid_t)VNOVAL) 1170 uid = de->de_uid; 1171 else 1172 uid = vap->va_uid; 1173 if (vap->va_gid == (gid_t)VNOVAL) 1174 gid = de->de_gid; 1175 else 1176 gid = vap->va_gid; 1177 if (uid != de->de_uid || gid != de->de_gid) { 1178 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1179 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1180 error = priv_check(ap->a_td, PRIV_VFS_CHOWN); 1181 if (error) 1182 return (error); 1183 } 1184 de->de_uid = uid; 1185 de->de_gid = gid; 1186 c = 1; 1187 } 1188 1189 if (vap->va_mode != (mode_t)VNOVAL) { 1190 if (ap->a_cred->cr_uid != de->de_uid) { 1191 error = priv_check(ap->a_td, PRIV_VFS_ADMIN); 1192 if (error) 1193 return (error); 1194 } 1195 de->de_mode = vap->va_mode; 1196 c = 1; 1197 } 1198 1199 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1200 /* See the comment in ufs_vnops::ufs_setattr(). */ 1201 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) && 1202 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1203 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td)))) 1204 return (error); 1205 if (vap->va_atime.tv_sec != VNOVAL) { 1206 if (vp->v_type == VCHR) 1207 vp->v_rdev->si_atime = vap->va_atime; 1208 else 1209 de->de_atime = vap->va_atime; 1210 } 1211 if (vap->va_mtime.tv_sec != VNOVAL) { 1212 if (vp->v_type == VCHR) 1213 vp->v_rdev->si_mtime = vap->va_mtime; 1214 else 1215 de->de_mtime = vap->va_mtime; 1216 } 1217 c = 1; 1218 } 1219 1220 if (c) { 1221 if (vp->v_type == VCHR) 1222 vfs_timestamp(&vp->v_rdev->si_ctime); 1223 else 1224 vfs_timestamp(&de->de_mtime); 1225 } 1226 return (0); 1227 } 1228 1229 #ifdef MAC 1230 static int 1231 devfs_setlabel(struct vop_setlabel_args *ap) 1232 { 1233 struct vnode *vp; 1234 struct devfs_dirent *de; 1235 1236 vp = ap->a_vp; 1237 de = vp->v_data; 1238 1239 mac_relabel_vnode(ap->a_cred, vp, ap->a_label); 1240 mac_update_devfs(vp->v_mount, de, vp); 1241 1242 return (0); 1243 } 1244 #endif 1245 1246 static int 1247 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) 1248 { 1249 1250 return (vnops.fo_stat(fp, sb, cred, td)); 1251 } 1252 1253 static int 1254 devfs_symlink(struct vop_symlink_args *ap) 1255 { 1256 int i, error; 1257 struct devfs_dirent *dd; 1258 struct devfs_dirent *de; 1259 struct devfs_mount *dmp; 1260 struct thread *td; 1261 1262 td = ap->a_cnp->cn_thread; 1263 KASSERT(td == curthread, ("devfs_symlink: td != curthread")); 1264 1265 error = priv_check(td, PRIV_DEVFS_SYMLINK); 1266 if (error) 1267 return(error); 1268 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1269 dd = ap->a_dvp->v_data; 1270 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1271 de->de_uid = 0; 1272 de->de_gid = 0; 1273 de->de_mode = 0755; 1274 de->de_inode = alloc_unr(devfs_inos); 1275 de->de_dirent->d_type = DT_LNK; 1276 i = strlen(ap->a_target) + 1; 1277 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1278 bcopy(ap->a_target, de->de_symlink, i); 1279 sx_xlock(&dmp->dm_lock); 1280 #ifdef MAC 1281 mac_create_devfs_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1282 #endif 1283 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 1284 return (devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, td)); 1285 } 1286 1287 /* ARGSUSED */ 1288 static int 1289 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 1290 { 1291 struct cdev *dev; 1292 int error, ioflag, resid; 1293 struct cdevsw *dsw; 1294 1295 error = devfs_fp_check(fp, &dev, &dsw); 1296 if (error) 1297 return (error); 1298 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1299 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1300 if (ioflag & O_DIRECT) 1301 ioflag |= IO_DIRECT; 1302 if ((flags & FOF_OFFSET) == 0) 1303 uio->uio_offset = fp->f_offset; 1304 1305 resid = uio->uio_resid; 1306 1307 error = dsw->d_write(dev, uio, ioflag); 1308 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1309 vfs_timestamp(&dev->si_ctime); 1310 dev->si_mtime = dev->si_ctime; 1311 } 1312 dev_relthread(dev); 1313 1314 if ((flags & FOF_OFFSET) == 0) 1315 fp->f_offset = uio->uio_offset; 1316 fp->f_nextoff = uio->uio_offset; 1317 return (error); 1318 } 1319 1320 dev_t 1321 dev2udev(struct cdev *x) 1322 { 1323 if (x == NULL) 1324 return (NODEV); 1325 return (x->si_priv->cdp_inode); 1326 } 1327 1328 static struct fileops devfs_ops_f = { 1329 .fo_read = devfs_read_f, 1330 .fo_write = devfs_write_f, 1331 .fo_ioctl = devfs_ioctl_f, 1332 .fo_poll = devfs_poll_f, 1333 .fo_kqfilter = devfs_kqfilter_f, 1334 .fo_stat = devfs_stat_f, 1335 .fo_close = devfs_close_f, 1336 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 1337 }; 1338 1339 static struct vop_vector devfs_vnodeops = { 1340 .vop_default = &default_vnodeops, 1341 1342 .vop_access = devfs_access, 1343 .vop_getattr = devfs_getattr, 1344 .vop_ioctl = devfs_rioctl, 1345 .vop_lookup = devfs_lookup, 1346 .vop_mknod = devfs_mknod, 1347 .vop_pathconf = devfs_pathconf, 1348 .vop_read = devfs_rread, 1349 .vop_readdir = devfs_readdir, 1350 .vop_readlink = devfs_readlink, 1351 .vop_reclaim = devfs_reclaim, 1352 .vop_remove = devfs_remove, 1353 .vop_revoke = devfs_revoke, 1354 .vop_setattr = devfs_setattr, 1355 #ifdef MAC 1356 .vop_setlabel = devfs_setlabel, 1357 #endif 1358 .vop_symlink = devfs_symlink, 1359 }; 1360 1361 static struct vop_vector devfs_specops = { 1362 .vop_default = &default_vnodeops, 1363 1364 .vop_access = devfs_access, 1365 .vop_advlock = devfs_advlock, 1366 .vop_bmap = VOP_PANIC, 1367 .vop_close = devfs_close, 1368 .vop_create = VOP_PANIC, 1369 .vop_fsync = devfs_fsync, 1370 .vop_getattr = devfs_getattr, 1371 .vop_lease = VOP_NULL, 1372 .vop_link = VOP_PANIC, 1373 .vop_mkdir = VOP_PANIC, 1374 .vop_mknod = VOP_PANIC, 1375 .vop_open = devfs_open, 1376 .vop_pathconf = devfs_pathconf, 1377 .vop_print = devfs_print, 1378 .vop_read = VOP_PANIC, 1379 .vop_readdir = VOP_PANIC, 1380 .vop_readlink = VOP_PANIC, 1381 .vop_reallocblks = VOP_PANIC, 1382 .vop_reclaim = devfs_reclaim, 1383 .vop_remove = devfs_remove, 1384 .vop_rename = VOP_PANIC, 1385 .vop_revoke = devfs_revoke, 1386 .vop_rmdir = VOP_PANIC, 1387 .vop_setattr = devfs_setattr, 1388 #ifdef MAC 1389 .vop_setlabel = devfs_setlabel, 1390 #endif 1391 .vop_strategy = VOP_PANIC, 1392 .vop_symlink = VOP_PANIC, 1393 .vop_write = VOP_PANIC, 1394 }; 1395 1396 /* 1397 * Our calling convention to the device drivers used to be that we passed 1398 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 1399 * flags instead since that's what open(), close() and ioctl() takes and 1400 * we don't really want vnode.h in device drivers. 1401 * We solved the source compatibility by redefining some vnode flags to 1402 * be the same as the fcntl ones and by sending down the bitwise OR of 1403 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 1404 * pulls the rug out under this. 1405 */ 1406 CTASSERT(O_NONBLOCK == IO_NDELAY); 1407 CTASSERT(O_FSYNC == IO_SYNC);
Cache object: c343a72260979ebbc08c28533bc331d0
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