Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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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: releng/6.4/sys/fs/devfs/devfs_vnops.c 197715 2009-10-02 18:09:56Z simon $ 35 */ 36 37 /* 38 * TODO: 39 * remove empty directories 40 * mkdir: want it ? 41 */ 42 43 #include <opt_devfs.h> 44 #include <opt_mac.h> 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/conf.h> 49 #include <sys/dirent.h> 50 #include <sys/fcntl.h> 51 #include <sys/file.h> 52 #include <sys/filedesc.h> 53 #include <sys/filio.h> 54 #include <sys/kernel.h> 55 #include <sys/lock.h> 56 #include <sys/mac.h> 57 #include <sys/malloc.h> 58 #include <sys/mount.h> 59 #include <sys/namei.h> 60 #include <sys/proc.h> 61 #include <sys/stat.h> 62 #include <sys/sx.h> 63 #include <sys/time.h> 64 #include <sys/ttycom.h> 65 #include <sys/unistd.h> 66 #include <sys/vnode.h> 67 68 static struct vop_vector devfs_vnodeops; 69 static struct vop_vector devfs_specops; 70 static struct fileops devfs_ops_f; 71 72 #include <fs/devfs/devfs.h> 73 #include <fs/devfs/devfs_int.h> 74 75 struct mtx devfs_de_interlock; 76 MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF); 77 78 static int 79 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp) 80 { 81 82 *dswp = devvn_refthread(fp->f_vnode, devp); 83 if (*devp != fp->f_data) { 84 if (*dswp != NULL) 85 dev_relthread(*devp); 86 return (ENXIO); 87 } 88 KASSERT((*devp)->si_refcount > 0, 89 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp))); 90 if (*dswp == NULL) 91 return (ENXIO); 92 return (0); 93 } 94 95 /* 96 * Construct the fully qualified path name relative to the mountpoint 97 */ 98 static char * 99 devfs_fqpn(char *buf, struct vnode *dvp, struct componentname *cnp) 100 { 101 int i; 102 struct devfs_dirent *de, *dd; 103 struct devfs_mount *dmp; 104 105 dmp = VFSTODEVFS(dvp->v_mount); 106 dd = dvp->v_data; 107 i = SPECNAMELEN; 108 buf[i] = '\0'; 109 i -= cnp->cn_namelen; 110 if (i < 0) 111 return (NULL); 112 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); 113 de = dd; 114 while (de != dmp->dm_rootdir) { 115 i--; 116 if (i < 0) 117 return (NULL); 118 buf[i] = '/'; 119 i -= de->de_dirent->d_namlen; 120 if (i < 0) 121 return (NULL); 122 bcopy(de->de_dirent->d_name, buf + i, 123 de->de_dirent->d_namlen); 124 de = TAILQ_FIRST(&de->de_dlist); /* "." */ 125 de = TAILQ_NEXT(de, de_list); /* ".." */ 126 de = de->de_dir; 127 } 128 return (buf + i); 129 } 130 131 static int 132 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp, 133 struct devfs_dirent *de) 134 { 135 int not_found; 136 137 not_found = 0; 138 if (de->de_flags & DE_DOOMED) 139 not_found = 1; 140 if (DEVFS_DE_DROP(de)) { 141 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed")); 142 devfs_dirent_free(de); 143 } 144 if (DEVFS_DMP_DROP(dmp)) { 145 KASSERT(not_found == 1, 146 ("DEVFS mount struct freed before dirent")); 147 not_found = 2; 148 sx_xunlock(&dmp->dm_lock); 149 devfs_unmount_final(dmp); 150 } 151 if (not_found == 1 || (drop_dm_lock && not_found != 2)) 152 sx_unlock(&dmp->dm_lock); 153 return (not_found); 154 } 155 156 /* 157 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops 158 * it on return. 159 */ 160 int 161 devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td) 162 { 163 int error; 164 struct vnode *vp; 165 struct cdev *dev; 166 struct devfs_mount *dmp; 167 168 KASSERT(td == curthread, ("devfs_allocv: td != curthread")); 169 dmp = VFSTODEVFS(mp); 170 if (de->de_flags & DE_DOOMED) { 171 sx_xunlock(&dmp->dm_lock); 172 return (ENOENT); 173 } 174 loop: 175 DEVFS_DE_HOLD(de); 176 DEVFS_DMP_HOLD(dmp); 177 mtx_lock(&devfs_de_interlock); 178 vp = de->de_vnode; 179 if (vp != NULL) { 180 VI_LOCK(vp); 181 mtx_unlock(&devfs_de_interlock); 182 sx_xunlock(&dmp->dm_lock); 183 error = vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td); 184 sx_xlock(&dmp->dm_lock); 185 if (devfs_allocv_drop_refs(0, dmp, de)) { 186 if (error == 0) 187 vput(vp); 188 return (ENOENT); 189 } 190 else if (error) 191 goto loop; 192 sx_xunlock(&dmp->dm_lock); 193 *vpp = vp; 194 return (0); 195 } 196 mtx_unlock(&devfs_de_interlock); 197 if (de->de_dirent->d_type == DT_CHR) { 198 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { 199 devfs_allocv_drop_refs(1, dmp, de); 200 return (ENOENT); 201 } 202 dev = &de->de_cdp->cdp_c; 203 } else { 204 dev = NULL; 205 } 206 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 207 if (error != 0) { 208 devfs_allocv_drop_refs(1, dmp, de); 209 printf("devfs_allocv: failed to allocate new vnode\n"); 210 return (error); 211 } 212 213 if (de->de_dirent->d_type == DT_CHR) { 214 vp->v_type = VCHR; 215 VI_LOCK(vp); 216 dev_lock(); 217 dev_refl(dev); 218 /* XXX: v_rdev should be protect by vnode lock */ 219 vp->v_rdev = dev; 220 KASSERT(vp->v_usecount == 1, 221 ("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount)); 222 dev->si_usecount += vp->v_usecount; 223 dev_unlock(); 224 VI_UNLOCK(vp); 225 vp->v_op = &devfs_specops; 226 } else if (de->de_dirent->d_type == DT_DIR) { 227 vp->v_type = VDIR; 228 } else if (de->de_dirent->d_type == DT_LNK) { 229 vp->v_type = VLNK; 230 } else { 231 vp->v_type = VBAD; 232 } 233 mtx_lock(&devfs_de_interlock); 234 vp->v_data = de; 235 de->de_vnode = vp; 236 mtx_unlock(&devfs_de_interlock); 237 sx_xunlock(&dmp->dm_lock); 238 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 239 sx_xlock(&dmp->dm_lock); 240 if (devfs_allocv_drop_refs(0, dmp, de)) { 241 vput(vp); 242 return (ENOENT); 243 } 244 #ifdef MAC 245 mac_associate_vnode_devfs(mp, de, vp); 246 #endif 247 sx_xunlock(&dmp->dm_lock); 248 *vpp = vp; 249 return (0); 250 } 251 252 static int 253 devfs_access(struct vop_access_args *ap) 254 { 255 struct vnode *vp = ap->a_vp; 256 struct devfs_dirent *de; 257 int error; 258 259 de = vp->v_data; 260 if (vp->v_type == VDIR) 261 de = de->de_dir; 262 263 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 264 ap->a_mode, ap->a_cred, NULL); 265 if (!error) 266 return (error); 267 if (error != EACCES) 268 return (error); 269 /* We do, however, allow access to the controlling terminal */ 270 if (!(ap->a_td->td_proc->p_flag & P_CONTROLT)) 271 return (error); 272 if (ap->a_td->td_proc->p_session->s_ttyvp == de->de_vnode) 273 return (0); 274 return (error); 275 } 276 277 /* ARGSUSED */ 278 static int 279 devfs_advlock(struct vop_advlock_args *ap) 280 { 281 282 return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL); 283 } 284 285 /* ARGSUSED */ 286 static int 287 devfs_close(struct vop_close_args *ap) 288 { 289 struct vnode *vp = ap->a_vp, *oldvp; 290 struct thread *td = ap->a_td; 291 struct cdev *dev = vp->v_rdev; 292 struct cdevsw *dsw; 293 int vp_locked, error; 294 295 /* 296 * Hack: a tty device that is a controlling terminal 297 * has a reference from the session structure. 298 * We cannot easily tell that a character device is 299 * a controlling terminal, unless it is the closing 300 * process' controlling terminal. In that case, 301 * if the reference count is 2 (this last descriptor 302 * plus the session), release the reference from the session. 303 */ 304 305 /* 306 * This needs to be rewritten to take the vp interlock into 307 * consideration. 308 */ 309 310 oldvp = NULL; 311 sx_xlock(&proctree_lock); 312 if (td && vp == td->td_proc->p_session->s_ttyvp) { 313 SESS_LOCK(td->td_proc->p_session); 314 VI_LOCK(vp); 315 if (count_dev(dev) == 2 && (vp->v_iflag & VI_DOOMED) == 0) { 316 td->td_proc->p_session->s_ttyvp = NULL; 317 oldvp = vp; 318 } 319 VI_UNLOCK(vp); 320 SESS_UNLOCK(td->td_proc->p_session); 321 } 322 sx_xunlock(&proctree_lock); 323 if (oldvp != NULL) 324 vrele(oldvp); 325 /* 326 * We do not want to really close the device if it 327 * is still in use unless we are trying to close it 328 * forcibly. Since every use (buffer, vnode, swap, cmap) 329 * holds a reference to the vnode, and because we mark 330 * any other vnodes that alias this device, when the 331 * sum of the reference counts on all the aliased 332 * vnodes descends to one, we are on last close. 333 */ 334 dsw = dev_refthread(dev); 335 if (dsw == NULL) 336 return (ENXIO); 337 VI_LOCK(vp); 338 if (vp->v_iflag & VI_DOOMED) { 339 /* Forced close. */ 340 } else if (dsw->d_flags & D_TRACKCLOSE) { 341 /* Keep device updated on status. */ 342 } else if (count_dev(dev) > 1) { 343 VI_UNLOCK(vp); 344 dev_relthread(dev); 345 return (0); 346 } 347 vholdl(vp); 348 VI_UNLOCK(vp); 349 vp_locked = VOP_ISLOCKED(vp, td); 350 VOP_UNLOCK(vp, 0, td); 351 KASSERT(dev->si_refcount > 0, 352 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 353 if (!(dsw->d_flags & D_NEEDGIANT)) { 354 DROP_GIANT(); 355 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 356 PICKUP_GIANT(); 357 } else { 358 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 359 } 360 dev_relthread(dev); 361 vn_lock(vp, vp_locked | LK_RETRY, td); 362 vdrop(vp); 363 return (error); 364 } 365 366 static int 367 devfs_close_f(struct file *fp, struct thread *td) 368 { 369 370 return (vnops.fo_close(fp, td)); 371 } 372 373 /* ARGSUSED */ 374 static int 375 devfs_fsync(struct vop_fsync_args *ap) 376 { 377 if (!vn_isdisk(ap->a_vp, NULL)) 378 return (0); 379 380 return (vop_stdfsync(ap)); 381 } 382 383 static int 384 devfs_getattr(struct vop_getattr_args *ap) 385 { 386 struct vnode *vp = ap->a_vp; 387 struct vattr *vap = ap->a_vap; 388 int error = 0; 389 struct devfs_dirent *de; 390 struct cdev *dev; 391 392 de = vp->v_data; 393 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 394 if (vp->v_type == VDIR) { 395 de = de->de_dir; 396 KASSERT(de != NULL, 397 ("Null dir dirent in devfs_getattr vp=%p", vp)); 398 } 399 bzero((caddr_t) vap, sizeof(*vap)); 400 vattr_null(vap); 401 vap->va_uid = de->de_uid; 402 vap->va_gid = de->de_gid; 403 vap->va_mode = de->de_mode; 404 if (vp->v_type == VLNK) 405 vap->va_size = strlen(de->de_symlink); 406 else if (vp->v_type == VDIR) 407 vap->va_size = vap->va_bytes = DEV_BSIZE; 408 else 409 vap->va_size = 0; 410 if (vp->v_type != VDIR) 411 vap->va_bytes = 0; 412 vap->va_blocksize = DEV_BSIZE; 413 vap->va_type = vp->v_type; 414 415 #define fix(aa) \ 416 do { \ 417 if ((aa).tv_sec == 0) { \ 418 (aa).tv_sec = boottime.tv_sec; \ 419 (aa).tv_nsec = boottime.tv_usec * 1000; \ 420 } \ 421 } while (0) 422 423 if (vp->v_type != VCHR) { 424 fix(de->de_atime); 425 vap->va_atime = de->de_atime; 426 fix(de->de_mtime); 427 vap->va_mtime = de->de_mtime; 428 fix(de->de_ctime); 429 vap->va_ctime = de->de_ctime; 430 } else { 431 dev = vp->v_rdev; 432 fix(dev->si_atime); 433 vap->va_atime = dev->si_atime; 434 fix(dev->si_mtime); 435 vap->va_mtime = dev->si_mtime; 436 fix(dev->si_ctime); 437 vap->va_ctime = dev->si_ctime; 438 439 vap->va_rdev = dev->si_priv->cdp_inode; 440 } 441 vap->va_gen = 0; 442 vap->va_flags = 0; 443 vap->va_nlink = de->de_links; 444 vap->va_fileid = de->de_inode; 445 446 return (error); 447 } 448 449 /* ARGSUSED */ 450 static int 451 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 452 { 453 struct cdev *dev; 454 struct cdevsw *dsw; 455 struct vnode *vp; 456 struct vnode *vpold; 457 int error, i; 458 const char *p; 459 struct fiodgname_arg *fgn; 460 461 error = devfs_fp_check(fp, &dev, &dsw); 462 if (error) 463 return (error); 464 465 if (com == FIODTYPE) { 466 *(int *)data = dsw->d_flags & D_TYPEMASK; 467 dev_relthread(dev); 468 return (0); 469 } else if (com == FIODGNAME) { 470 fgn = data; 471 p = devtoname(dev); 472 i = strlen(p) + 1; 473 if (i > fgn->len) 474 error = EINVAL; 475 else 476 error = copyout(p, fgn->buf, i); 477 dev_relthread(dev); 478 return (error); 479 } 480 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td); 481 dev_relthread(dev); 482 if (error == ENOIOCTL) 483 error = ENOTTY; 484 if (error == 0 && com == TIOCSCTTY) { 485 vp = fp->f_vnode; 486 487 /* Do nothing if reassigning same control tty */ 488 sx_slock(&proctree_lock); 489 if (td->td_proc->p_session->s_ttyvp == vp) { 490 sx_sunlock(&proctree_lock); 491 return (0); 492 } 493 494 mtx_lock(&Giant); 495 496 vpold = td->td_proc->p_session->s_ttyvp; 497 VREF(vp); 498 SESS_LOCK(td->td_proc->p_session); 499 td->td_proc->p_session->s_ttyvp = vp; 500 SESS_UNLOCK(td->td_proc->p_session); 501 502 sx_sunlock(&proctree_lock); 503 504 /* Get rid of reference to old control tty */ 505 if (vpold) 506 vrele(vpold); 507 mtx_unlock(&Giant); 508 } 509 return (error); 510 } 511 512 /* ARGSUSED */ 513 static int 514 devfs_kqfilter_f(struct file *fp, struct knote *kn) 515 { 516 struct cdev *dev; 517 struct cdevsw *dsw; 518 int error; 519 520 error = devfs_fp_check(fp, &dev, &dsw); 521 if (error) 522 return (error); 523 error = dsw->d_kqfilter(dev, kn); 524 dev_relthread(dev); 525 return (error); 526 } 527 528 static int 529 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 530 { 531 struct componentname *cnp; 532 struct vnode *dvp, **vpp; 533 struct thread *td; 534 struct devfs_dirent *de, *dd; 535 struct devfs_dirent **dde; 536 struct devfs_mount *dmp; 537 struct cdev *cdev; 538 int error, flags, nameiop; 539 char specname[SPECNAMELEN + 1], *pname; 540 541 cnp = ap->a_cnp; 542 vpp = ap->a_vpp; 543 dvp = ap->a_dvp; 544 pname = cnp->cn_nameptr; 545 td = cnp->cn_thread; 546 flags = cnp->cn_flags; 547 nameiop = cnp->cn_nameiop; 548 dmp = VFSTODEVFS(dvp->v_mount); 549 dd = dvp->v_data; 550 *vpp = NULLVP; 551 552 if ((flags & ISLASTCN) && nameiop == RENAME) 553 return (EOPNOTSUPP); 554 555 if (dvp->v_type != VDIR) 556 return (ENOTDIR); 557 558 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 559 return (EIO); 560 561 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 562 if (error) 563 return (error); 564 565 if (cnp->cn_namelen == 1 && *pname == '.') { 566 if ((flags & ISLASTCN) && nameiop != LOOKUP) 567 return (EINVAL); 568 *vpp = dvp; 569 VREF(dvp); 570 return (0); 571 } 572 573 if (flags & ISDOTDOT) { 574 if ((flags & ISLASTCN) && nameiop != LOOKUP) 575 return (EINVAL); 576 VOP_UNLOCK(dvp, 0, td); 577 de = TAILQ_FIRST(&dd->de_dlist); /* "." */ 578 de = TAILQ_NEXT(de, de_list); /* ".." */ 579 de = de->de_dir; 580 error = devfs_allocv(de, dvp->v_mount, vpp, td); 581 *dm_unlock = 0; 582 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 583 return (error); 584 } 585 586 DEVFS_DMP_HOLD(dmp); 587 devfs_populate(dmp); 588 if (DEVFS_DMP_DROP(dmp)) { 589 *dm_unlock = 0; 590 sx_xunlock(&dmp->dm_lock); 591 devfs_unmount_final(dmp); 592 return (ENOENT); 593 } 594 dd = dvp->v_data; 595 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen); 596 while (de == NULL) { /* While(...) so we can use break */ 597 598 if (nameiop == DELETE) 599 return (ENOENT); 600 601 /* 602 * OK, we didn't have an entry for the name we were asked for 603 * so we try to see if anybody can create it on demand. 604 */ 605 pname = devfs_fqpn(specname, dvp, cnp); 606 if (pname == NULL) 607 break; 608 609 cdev = NULL; 610 EVENTHANDLER_INVOKE(dev_clone, 611 td->td_ucred, pname, strlen(pname), &cdev); 612 if (cdev == NULL) 613 break; 614 615 DEVFS_DMP_HOLD(dmp); 616 devfs_populate(dmp); 617 if (DEVFS_DMP_DROP(dmp)) { 618 *dm_unlock = 0; 619 sx_xunlock(&dmp->dm_lock); 620 devfs_unmount_final(dmp); 621 return (ENOENT); 622 } 623 624 dev_lock(); 625 dde = &cdev->si_priv->cdp_dirents[dmp->dm_idx]; 626 if (dde != NULL && *dde != NULL) 627 de = *dde; 628 dev_unlock(); 629 dev_rel(cdev); 630 break; 631 } 632 633 if (de == NULL || de->de_flags & DE_WHITEOUT) { 634 if ((nameiop == CREATE || nameiop == RENAME) && 635 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 636 cnp->cn_flags |= SAVENAME; 637 return (EJUSTRETURN); 638 } 639 return (ENOENT); 640 } 641 642 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 643 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 644 if (error) 645 return (error); 646 if (*vpp == dvp) { 647 VREF(dvp); 648 *vpp = dvp; 649 return (0); 650 } 651 } 652 error = devfs_allocv(de, dvp->v_mount, vpp, td); 653 *dm_unlock = 0; 654 return (error); 655 } 656 657 static int 658 devfs_lookup(struct vop_lookup_args *ap) 659 { 660 int j; 661 struct devfs_mount *dmp; 662 int dm_unlock; 663 664 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 665 dm_unlock = 1; 666 sx_xlock(&dmp->dm_lock); 667 j = devfs_lookupx(ap, &dm_unlock); 668 if (dm_unlock == 1) 669 sx_xunlock(&dmp->dm_lock); 670 return (j); 671 } 672 673 static int 674 devfs_mknod(struct vop_mknod_args *ap) 675 { 676 struct componentname *cnp; 677 struct vnode *dvp, **vpp; 678 struct thread *td; 679 struct devfs_dirent *dd, *de; 680 struct devfs_mount *dmp; 681 int error; 682 683 /* 684 * The only type of node we should be creating here is a 685 * character device, for anything else return EOPNOTSUPP. 686 */ 687 if (ap->a_vap->va_type != VCHR) 688 return (EOPNOTSUPP); 689 dvp = ap->a_dvp; 690 dmp = VFSTODEVFS(dvp->v_mount); 691 692 cnp = ap->a_cnp; 693 vpp = ap->a_vpp; 694 td = cnp->cn_thread; 695 dd = dvp->v_data; 696 697 error = ENOENT; 698 sx_xlock(&dmp->dm_lock); 699 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 700 if (cnp->cn_namelen != de->de_dirent->d_namlen) 701 continue; 702 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 703 de->de_dirent->d_namlen) != 0) 704 continue; 705 if (de->de_flags & DE_WHITEOUT) 706 break; 707 goto notfound; 708 } 709 if (de == NULL) 710 goto notfound; 711 de->de_flags &= ~DE_WHITEOUT; 712 error = devfs_allocv(de, dvp->v_mount, vpp, td); 713 return (error); 714 notfound: 715 sx_xunlock(&dmp->dm_lock); 716 return (error); 717 } 718 719 /* ARGSUSED */ 720 static int 721 devfs_open(struct vop_open_args *ap) 722 { 723 struct thread *td = ap->a_td; 724 struct vnode *vp = ap->a_vp; 725 struct cdev *dev = vp->v_rdev; 726 struct file *fp; 727 int error; 728 struct cdevsw *dsw; 729 730 if (vp->v_type == VBLK) 731 return (ENXIO); 732 733 if (dev == NULL) 734 return (ENXIO); 735 736 /* Make this field valid before any I/O in d_open. */ 737 if (dev->si_iosize_max == 0) 738 dev->si_iosize_max = DFLTPHYS; 739 740 if (vn_isdisk(vp, NULL) && 741 ap->a_cred != FSCRED && (ap->a_mode & FWRITE)) { 742 /* 743 * When running in very secure mode, do not allow 744 * opens for writing of any disks. 745 * XXX: should be in geom_dev.c, but we lack the cred there. 746 */ 747 error = securelevel_ge(td->td_ucred, 2); 748 if (error) 749 return (error); 750 } 751 752 dsw = dev_refthread(dev); 753 if (dsw == NULL) 754 return (ENXIO); 755 756 /* XXX: Special casing of ttys for deadfs. Probably redundant. */ 757 if (dsw->d_flags & D_TTY) 758 vp->v_vflag |= VV_ISTTY; 759 760 VOP_UNLOCK(vp, 0, td); 761 762 if (ap->a_fdidx >= 0) 763 ap->a_td->td_proc->p_fd->fd_ofiles[ap->a_fdidx]->f_vnode = vp; 764 765 if(!(dsw->d_flags & D_NEEDGIANT)) { 766 DROP_GIANT(); 767 if (dsw->d_fdopen != NULL) 768 error = dsw->d_fdopen(dev, ap->a_mode, td, ap->a_fdidx); 769 else 770 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 771 PICKUP_GIANT(); 772 } else { 773 if (dsw->d_fdopen != NULL) 774 error = dsw->d_fdopen(dev, ap->a_mode, td, ap->a_fdidx); 775 else 776 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 777 } 778 779 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 780 781 dev_relthread(dev); 782 783 if (error) 784 return (error); 785 786 #if 0 /* /dev/console */ 787 KASSERT(ap->a_fdidx >= 0, 788 ("Could not vnode bypass device on fd %d", ap->a_fdidx)); 789 #else 790 if(ap->a_fdidx < 0) 791 return (error); 792 #endif 793 /* 794 * This is a pretty disgustingly long chain, but I am not 795 * sure there is any better way. Passing the fdidx into 796 * VOP_OPEN() offers us more information than just passing 797 * the file *. 798 */ 799 fp = ap->a_td->td_proc->p_fd->fd_ofiles[ap->a_fdidx]; 800 KASSERT(fp->f_ops == &badfileops, 801 ("Could not vnode bypass device on fdops %p", fp->f_ops)); 802 fp->f_ops = &devfs_ops_f; 803 fp->f_data = dev; 804 return (error); 805 } 806 807 static int 808 devfs_pathconf(struct vop_pathconf_args *ap) 809 { 810 811 switch (ap->a_name) { 812 case _PC_MAC_PRESENT: 813 #ifdef MAC 814 /* 815 * If MAC is enabled, devfs automatically supports 816 * trivial non-persistant label storage. 817 */ 818 *ap->a_retval = 1; 819 #else 820 *ap->a_retval = 0; 821 #endif 822 return (0); 823 default: 824 return (vop_stdpathconf(ap)); 825 } 826 /* NOTREACHED */ 827 } 828 829 /* ARGSUSED */ 830 static int 831 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 832 { 833 struct cdev *dev; 834 struct cdevsw *dsw; 835 int error; 836 837 error = devfs_fp_check(fp, &dev, &dsw); 838 if (error) 839 return (error); 840 error = dsw->d_poll(dev, events, td); 841 dev_relthread(dev); 842 return(error); 843 } 844 845 /* 846 * Print out the contents of a special device vnode. 847 */ 848 static int 849 devfs_print(struct vop_print_args *ap) 850 { 851 852 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 853 return (0); 854 } 855 856 /* ARGSUSED */ 857 static int 858 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 859 { 860 struct cdev *dev; 861 int ioflag, error, resid; 862 struct cdevsw *dsw; 863 864 error = devfs_fp_check(fp, &dev, &dsw); 865 if (error) 866 return (error); 867 resid = uio->uio_resid; 868 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 869 if (ioflag & O_DIRECT) 870 ioflag |= IO_DIRECT; 871 872 if ((flags & FOF_OFFSET) == 0) 873 uio->uio_offset = fp->f_offset; 874 875 error = dsw->d_read(dev, uio, ioflag); 876 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 877 vfs_timestamp(&dev->si_atime); 878 dev_relthread(dev); 879 880 if ((flags & FOF_OFFSET) == 0) 881 fp->f_offset = uio->uio_offset; 882 fp->f_nextoff = uio->uio_offset; 883 return (error); 884 } 885 886 static int 887 devfs_readdir(struct vop_readdir_args *ap) 888 { 889 int error; 890 struct uio *uio; 891 struct dirent *dp; 892 struct devfs_dirent *dd; 893 struct devfs_dirent *de; 894 struct devfs_mount *dmp; 895 off_t off, oldoff; 896 int *tmp_ncookies = NULL; 897 898 if (ap->a_vp->v_type != VDIR) 899 return (ENOTDIR); 900 901 uio = ap->a_uio; 902 if (uio->uio_offset < 0) 903 return (EINVAL); 904 905 /* 906 * XXX: This is a temporary hack to get around this filesystem not 907 * supporting cookies. We store the location of the ncookies pointer 908 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 909 * and set the number of cookies to 0. We then set the pointer to 910 * NULL so that vfs_read_dirent doesn't try to call realloc() on 911 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 912 * pointer to its original location before returning to the caller. 913 */ 914 if (ap->a_ncookies != NULL) { 915 tmp_ncookies = ap->a_ncookies; 916 *ap->a_ncookies = 0; 917 ap->a_ncookies = NULL; 918 } 919 920 dmp = VFSTODEVFS(ap->a_vp->v_mount); 921 sx_xlock(&dmp->dm_lock); 922 DEVFS_DMP_HOLD(dmp); 923 devfs_populate(dmp); 924 if (DEVFS_DMP_DROP(dmp)) { 925 sx_xunlock(&dmp->dm_lock); 926 devfs_unmount_final(dmp); 927 if (tmp_ncookies != NULL) 928 ap->a_ncookies = tmp_ncookies; 929 return (EIO); 930 } 931 error = 0; 932 de = ap->a_vp->v_data; 933 off = 0; 934 oldoff = uio->uio_offset; 935 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 936 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 937 if (dd->de_flags & DE_WHITEOUT) 938 continue; 939 if (dd->de_dirent->d_type == DT_DIR) 940 de = dd->de_dir; 941 else 942 de = dd; 943 dp = dd->de_dirent; 944 if (dp->d_reclen > uio->uio_resid) 945 break; 946 dp->d_fileno = de->de_inode; 947 if (off >= uio->uio_offset) { 948 error = vfs_read_dirent(ap, dp, off); 949 if (error) 950 break; 951 } 952 off += dp->d_reclen; 953 } 954 sx_xunlock(&dmp->dm_lock); 955 uio->uio_offset = off; 956 957 /* 958 * Restore ap->a_ncookies if it wasn't originally NULL in the first 959 * place. 960 */ 961 if (tmp_ncookies != NULL) 962 ap->a_ncookies = tmp_ncookies; 963 964 return (error); 965 } 966 967 static int 968 devfs_readlink(struct vop_readlink_args *ap) 969 { 970 struct devfs_dirent *de; 971 972 de = ap->a_vp->v_data; 973 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 974 } 975 976 static int 977 devfs_reclaim(struct vop_reclaim_args *ap) 978 { 979 struct vnode *vp = ap->a_vp; 980 struct devfs_dirent *de; 981 struct cdev *dev; 982 983 mtx_lock(&devfs_de_interlock); 984 de = vp->v_data; 985 if (de != NULL) { 986 de->de_vnode = NULL; 987 vp->v_data = NULL; 988 } 989 mtx_unlock(&devfs_de_interlock); 990 991 vnode_destroy_vobject(vp); 992 993 VI_LOCK(vp); 994 dev_lock(); 995 dev = vp->v_rdev; 996 vp->v_rdev = NULL; 997 998 if (dev == NULL) { 999 dev_unlock(); 1000 VI_UNLOCK(vp); 1001 return (0); 1002 } 1003 1004 dev->si_usecount -= vp->v_usecount; 1005 dev_unlock(); 1006 VI_UNLOCK(vp); 1007 dev_rel(dev); 1008 return (0); 1009 } 1010 1011 static int 1012 devfs_remove(struct vop_remove_args *ap) 1013 { 1014 struct vnode *vp = ap->a_vp; 1015 struct devfs_dirent *dd; 1016 struct devfs_dirent *de; 1017 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1018 1019 sx_xlock(&dmp->dm_lock); 1020 dd = ap->a_dvp->v_data; 1021 de = vp->v_data; 1022 if (de->de_cdp == NULL) { 1023 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1024 devfs_delete(dmp, de, 1); 1025 } else { 1026 de->de_flags |= DE_WHITEOUT; 1027 } 1028 sx_xunlock(&dmp->dm_lock); 1029 return (0); 1030 } 1031 1032 /* 1033 * Revoke is called on a tty when a terminal session ends. The vnode 1034 * is orphaned by setting v_op to deadfs so we need to let go of it 1035 * as well so that we create a new one next time around. 1036 * 1037 */ 1038 static int 1039 devfs_revoke(struct vop_revoke_args *ap) 1040 { 1041 struct vnode *vp = ap->a_vp, *vp2; 1042 struct cdev *dev; 1043 struct cdev_priv *cdp; 1044 struct devfs_dirent *de; 1045 int i; 1046 1047 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1048 1049 dev = vp->v_rdev; 1050 cdp = dev->si_priv; 1051 1052 dev_lock(); 1053 cdp->cdp_inuse++; 1054 dev_unlock(); 1055 1056 vhold(vp); 1057 vgone(vp); 1058 vdrop(vp); 1059 1060 VOP_UNLOCK(vp,0,curthread); 1061 loop: 1062 for (;;) { 1063 mtx_lock(&devfs_de_interlock); 1064 dev_lock(); 1065 vp2 = NULL; 1066 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1067 de = cdp->cdp_dirents[i]; 1068 if (de == NULL) 1069 continue; 1070 1071 vp2 = de->de_vnode; 1072 if (vp2 != NULL) { 1073 dev_unlock(); 1074 VI_LOCK(vp2); 1075 mtx_unlock(&devfs_de_interlock); 1076 if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK, 1077 curthread)) 1078 goto loop; 1079 vhold(vp2); 1080 vgone(vp2); 1081 vdrop(vp2); 1082 vput(vp2); 1083 break; 1084 } 1085 } 1086 if (vp2 != NULL) { 1087 continue; 1088 } 1089 dev_unlock(); 1090 mtx_unlock(&devfs_de_interlock); 1091 break; 1092 } 1093 dev_lock(); 1094 cdp->cdp_inuse--; 1095 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1096 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1097 dev_unlock(); 1098 dev_rel(&cdp->cdp_c); 1099 } else 1100 dev_unlock(); 1101 1102 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curthread); 1103 return (0); 1104 } 1105 1106 static int 1107 devfs_rioctl(struct vop_ioctl_args *ap) 1108 { 1109 int error; 1110 struct devfs_mount *dmp; 1111 1112 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1113 sx_xlock(&dmp->dm_lock); 1114 DEVFS_DMP_HOLD(dmp); 1115 devfs_populate(dmp); 1116 if (DEVFS_DMP_DROP(dmp)) { 1117 sx_xunlock(&dmp->dm_lock); 1118 devfs_unmount_final(dmp); 1119 return (ENOENT); 1120 } 1121 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1122 sx_xunlock(&dmp->dm_lock); 1123 return (error); 1124 } 1125 1126 static int 1127 devfs_rread(struct vop_read_args *ap) 1128 { 1129 1130 if (ap->a_vp->v_type != VDIR) 1131 return (EINVAL); 1132 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1133 } 1134 1135 static int 1136 devfs_setattr(struct vop_setattr_args *ap) 1137 { 1138 struct devfs_dirent *de; 1139 struct vattr *vap; 1140 struct vnode *vp; 1141 int c, error; 1142 uid_t uid; 1143 gid_t gid; 1144 1145 vap = ap->a_vap; 1146 vp = ap->a_vp; 1147 if ((vap->va_type != VNON) || 1148 (vap->va_nlink != VNOVAL) || 1149 (vap->va_fsid != VNOVAL) || 1150 (vap->va_fileid != VNOVAL) || 1151 (vap->va_blocksize != VNOVAL) || 1152 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1153 (vap->va_rdev != VNOVAL) || 1154 ((int)vap->va_bytes != VNOVAL) || 1155 (vap->va_gen != VNOVAL)) { 1156 return (EINVAL); 1157 } 1158 1159 de = vp->v_data; 1160 if (vp->v_type == VDIR) 1161 de = de->de_dir; 1162 1163 error = c = 0; 1164 if (vap->va_uid == (uid_t)VNOVAL) 1165 uid = de->de_uid; 1166 else 1167 uid = vap->va_uid; 1168 if (vap->va_gid == (gid_t)VNOVAL) 1169 gid = de->de_gid; 1170 else 1171 gid = vap->va_gid; 1172 if (uid != de->de_uid || gid != de->de_gid) { 1173 if (((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1174 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) && 1175 (error = suser_cred(ap->a_td->td_ucred, SUSER_ALLOWJAIL)) != 0) 1176 return (error); 1177 de->de_uid = uid; 1178 de->de_gid = gid; 1179 c = 1; 1180 } 1181 1182 if (vap->va_mode != (mode_t)VNOVAL) { 1183 if ((ap->a_cred->cr_uid != de->de_uid) && 1184 (error = suser_cred(ap->a_td->td_ucred, SUSER_ALLOWJAIL))) 1185 return (error); 1186 de->de_mode = vap->va_mode; 1187 c = 1; 1188 } 1189 1190 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1191 /* See the comment in ufs_vnops::ufs_setattr(). */ 1192 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) && 1193 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1194 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td)))) 1195 return (error); 1196 if (vap->va_atime.tv_sec != VNOVAL) { 1197 if (vp->v_type == VCHR) 1198 vp->v_rdev->si_atime = vap->va_atime; 1199 else 1200 de->de_atime = vap->va_atime; 1201 } 1202 if (vap->va_mtime.tv_sec != VNOVAL) { 1203 if (vp->v_type == VCHR) 1204 vp->v_rdev->si_mtime = vap->va_mtime; 1205 else 1206 de->de_mtime = vap->va_mtime; 1207 } 1208 c = 1; 1209 } 1210 1211 if (c) { 1212 if (vp->v_type == VCHR) 1213 vfs_timestamp(&vp->v_rdev->si_ctime); 1214 else 1215 vfs_timestamp(&de->de_mtime); 1216 } 1217 return (0); 1218 } 1219 1220 #ifdef MAC 1221 static int 1222 devfs_setlabel(struct vop_setlabel_args *ap) 1223 { 1224 struct vnode *vp; 1225 struct devfs_dirent *de; 1226 1227 vp = ap->a_vp; 1228 de = vp->v_data; 1229 1230 mac_relabel_vnode(ap->a_cred, vp, ap->a_label); 1231 mac_update_devfsdirent(vp->v_mount, de, vp); 1232 1233 return (0); 1234 } 1235 #endif 1236 1237 static int 1238 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) 1239 { 1240 1241 return (vnops.fo_stat(fp, sb, cred, td)); 1242 } 1243 1244 static int 1245 devfs_symlink(struct vop_symlink_args *ap) 1246 { 1247 int i, error; 1248 struct devfs_dirent *dd; 1249 struct devfs_dirent *de; 1250 struct devfs_mount *dmp; 1251 struct thread *td; 1252 1253 td = ap->a_cnp->cn_thread; 1254 KASSERT(td == curthread, ("devfs_symlink: td != curthread")); 1255 error = suser(td); 1256 if (error) 1257 return(error); 1258 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1259 dd = ap->a_dvp->v_data; 1260 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1261 de->de_uid = 0; 1262 de->de_gid = 0; 1263 de->de_mode = 0755; 1264 de->de_inode = alloc_unr(devfs_inos); 1265 de->de_dirent->d_type = DT_LNK; 1266 i = strlen(ap->a_target) + 1; 1267 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1268 bcopy(ap->a_target, de->de_symlink, i); 1269 sx_xlock(&dmp->dm_lock); 1270 #ifdef MAC 1271 mac_create_devfs_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1272 #endif 1273 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 1274 return (devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, td)); 1275 } 1276 1277 /* ARGSUSED */ 1278 static int 1279 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 1280 { 1281 struct cdev *dev; 1282 int error, ioflag, resid; 1283 struct cdevsw *dsw; 1284 1285 error = devfs_fp_check(fp, &dev, &dsw); 1286 if (error) 1287 return (error); 1288 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1289 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1290 if (ioflag & O_DIRECT) 1291 ioflag |= IO_DIRECT; 1292 if ((flags & FOF_OFFSET) == 0) 1293 uio->uio_offset = fp->f_offset; 1294 1295 resid = uio->uio_resid; 1296 1297 error = dsw->d_write(dev, uio, ioflag); 1298 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1299 vfs_timestamp(&dev->si_ctime); 1300 dev->si_mtime = dev->si_ctime; 1301 } 1302 dev_relthread(dev); 1303 1304 if ((flags & FOF_OFFSET) == 0) 1305 fp->f_offset = uio->uio_offset; 1306 fp->f_nextoff = uio->uio_offset; 1307 return (error); 1308 } 1309 1310 dev_t 1311 dev2udev(struct cdev *x) 1312 { 1313 if (x == NULL) 1314 return (NODEV); 1315 return (x->si_priv->cdp_inode); 1316 } 1317 1318 static struct fileops devfs_ops_f = { 1319 .fo_read = devfs_read_f, 1320 .fo_write = devfs_write_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);
Cache object: 707e61ae395af76ed1555b0057d11302
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