devfs_vnops.c revision 140196
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: head/sys/fs/devfs/devfs_vnops.c 140196 2005-01-13 18:59:48Z phk $ 35 */ 36 37/* 38 * TODO: 39 * remove empty directories 40 * mknod: hunt down DE_DELETED, compare name, reinstantiate. 41 * mkdir: want it ? 42 */ 43 44#include <opt_devfs.h> 45#include <opt_mac.h> 46 47#include <sys/param.h> 48#include <sys/systm.h> 49#include <sys/conf.h> 50#include <sys/dirent.h> 51#include <sys/fcntl.h> 52#include <sys/file.h> 53#include <sys/filedesc.h> 54#include <sys/filio.h> 55#include <sys/kernel.h> 56#include <sys/lock.h> 57#include <sys/mac.h> 58#include <sys/malloc.h> 59#include <sys/mount.h> 60#include <sys/namei.h> 61#include <sys/proc.h> 62#include <sys/stat.h> 63#include <sys/sx.h> 64#include <sys/time.h> 65#include <sys/ttycom.h> 66#include <sys/unistd.h> 67#include <sys/vnode.h> 68 69#include <fs/devfs/devfs.h> 70 71static fo_rdwr_t devfs_read_f; 72static fo_rdwr_t devfs_write_f; 73static fo_ioctl_t devfs_ioctl_f; 74static fo_poll_t devfs_poll_f; 75static fo_kqfilter_t devfs_kqfilter_f; 76static fo_stat_t devfs_stat_f; 77static fo_close_t devfs_close_f; 78 79struct fileops devfs_ops_f = { 80 .fo_read = devfs_read_f, 81 .fo_write = devfs_write_f, 82 .fo_ioctl = devfs_ioctl_f, 83 .fo_poll = devfs_poll_f, 84 .fo_kqfilter = devfs_kqfilter_f, 85 .fo_stat = devfs_stat_f, 86 .fo_close = devfs_close_f, 87 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 88}; 89 90static vop_access_t devfs_access; 91static vop_advlock_t devfs_advlock; 92static vop_close_t devfs_close; 93static vop_fsync_t devfs_fsync; 94static vop_getattr_t devfs_getattr; 95static vop_lookup_t devfs_lookupx; 96static vop_mknod_t devfs_mknod; 97static vop_open_t devfs_open; 98static vop_pathconf_t devfs_pathconf; 99static vop_print_t devfs_print; 100static vop_readdir_t devfs_readdir; 101static vop_readlink_t devfs_readlink; 102static vop_reclaim_t devfs_reclaim; 103static vop_remove_t devfs_remove; 104static vop_revoke_t devfs_revoke; 105static vop_ioctl_t devfs_rioctl; 106static vop_read_t devfs_rread; 107static vop_setattr_t devfs_setattr; 108#ifdef MAC 109static vop_setlabel_t devfs_setlabel; 110#endif 111static vop_symlink_t devfs_symlink; 112 113extern struct vop_vector devfs_vnodeops; 114extern struct vop_vector devfs_specops; 115 116static int 117devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp) 118{ 119 120 *devp = fp->f_vnode->v_rdev; 121 if (*devp != fp->f_data) 122 return (ENXIO); 123 KASSERT((*devp)->si_refcount > 0, 124 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp))); 125 *dswp = dev_refthread(*devp); 126 if (*dswp == NULL) 127 return (ENXIO); 128 return (0); 129} 130 131/* 132 * Construct the fully qualified path name relative to the mountpoint 133 */ 134static char * 135devfs_fqpn(char *buf, struct vnode *dvp, struct componentname *cnp) 136{ 137 int i; 138 struct devfs_dirent *de, *dd; 139 struct devfs_mount *dmp; 140 141 dmp = VFSTODEVFS(dvp->v_mount); 142 dd = dvp->v_data; 143 i = SPECNAMELEN; 144 buf[i] = '\0'; 145 i -= cnp->cn_namelen; 146 if (i < 0) 147 return (NULL); 148 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); 149 de = dd; 150 while (de != dmp->dm_basedir) { 151 i--; 152 if (i < 0) 153 return (NULL); 154 buf[i] = '/'; 155 i -= de->de_dirent->d_namlen; 156 if (i < 0) 157 return (NULL); 158 bcopy(de->de_dirent->d_name, buf + i, 159 de->de_dirent->d_namlen); 160 de = TAILQ_FIRST(&de->de_dlist); /* "." */ 161 de = TAILQ_NEXT(de, de_list); /* ".." */ 162 de = de->de_dir; 163 } 164 return (buf + i); 165} 166 167int 168devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td) 169{ 170 int error; 171 struct vnode *vp; 172 struct cdev *dev; 173 174 KASSERT(td == curthread, ("devfs_allocv: td != curthread")); 175loop: 176 vp = de->de_vnode; 177 if (vp != NULL) { 178 if (vget(vp, LK_EXCLUSIVE, td)) 179 goto loop; 180 *vpp = vp; 181 return (0); 182 } 183 if (de->de_dirent->d_type == DT_CHR) { 184 dev = *devfs_itod(de->de_inode); 185 if (dev == NULL) 186 return (ENOENT); 187 } else { 188 dev = NULL; 189 } 190 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 191 if (error != 0) { 192 printf("devfs_allocv: failed to allocate new vnode\n"); 193 return (error); 194 } 195 196 if (de->de_dirent->d_type == DT_CHR) { 197 vp->v_type = VCHR; 198 VI_LOCK(vp); 199 dev_lock(); 200 dev->si_refcount++; 201 vp->v_rdev = dev; 202 SLIST_INSERT_HEAD(&dev->si_hlist, vp, v_specnext); 203 dev->si_usecount += vp->v_usecount; 204 dev_unlock(); 205 VI_UNLOCK(vp); 206 vp->v_op = &devfs_specops; 207 } else if (de->de_dirent->d_type == DT_DIR) { 208 vp->v_type = VDIR; 209 } else if (de->de_dirent->d_type == DT_LNK) { 210 vp->v_type = VLNK; 211 } else { 212 vp->v_type = VBAD; 213 } 214 vp->v_data = de; 215 de->de_vnode = vp; 216 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 217#ifdef MAC 218 mac_associate_vnode_devfs(mp, de, vp); 219#endif 220 *vpp = vp; 221 return (0); 222} 223 224static int 225devfs_access(ap) 226 struct vop_access_args /* { 227 struct vnode *a_vp; 228 int a_mode; 229 struct ucred *a_cred; 230 struct thread *a_td; 231 } */ *ap; 232{ 233 struct vnode *vp = ap->a_vp; 234 struct devfs_dirent *de; 235 int error; 236 237 de = vp->v_data; 238 if (vp->v_type == VDIR) 239 de = de->de_dir; 240 241 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 242 ap->a_mode, ap->a_cred, NULL); 243 if (!error) 244 return (error); 245 if (error != EACCES) 246 return (error); 247 /* We do, however, allow access to the controlling terminal */ 248 if (!(ap->a_td->td_proc->p_flag & P_CONTROLT)) 249 return (error); 250 if (ap->a_td->td_proc->p_session->s_ttyvp == de->de_vnode) 251 return (0); 252 return (error); 253} 254 255/* 256 * Special device advisory byte-level locks. 257 */ 258/* ARGSUSED */ 259static int 260devfs_advlock(ap) 261 struct vop_advlock_args /* { 262 struct vnode *a_vp; 263 caddr_t a_id; 264 int a_op; 265 struct flock *a_fl; 266 int a_flags; 267 } */ *ap; 268{ 269 270 return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL); 271} 272 273/* 274 * Device close routine 275 */ 276/* ARGSUSED */ 277static int 278devfs_close(ap) 279 struct vop_close_args /* { 280 struct vnode *a_vp; 281 int a_fflag; 282 struct ucred *a_cred; 283 struct thread *a_td; 284 } */ *ap; 285{ 286 struct vnode *vp = ap->a_vp, *oldvp; 287 struct thread *td = ap->a_td; 288 struct cdev *dev = vp->v_rdev; 289 struct cdevsw *dsw; 290 int error; 291 292 /* 293 * Hack: a tty device that is a controlling terminal 294 * has a reference from the session structure. 295 * We cannot easily tell that a character device is 296 * a controlling terminal, unless it is the closing 297 * process' controlling terminal. In that case, 298 * if the reference count is 2 (this last descriptor 299 * plus the session), release the reference from the session. 300 */ 301 302 /* 303 * This needs to be rewritten to take the vp interlock into 304 * consideration. 305 */ 306 307 oldvp = NULL; 308 sx_xlock(&proctree_lock); 309 if (td && vp == td->td_proc->p_session->s_ttyvp) { 310 SESS_LOCK(td->td_proc->p_session); 311 VI_LOCK(vp); 312 if (count_dev(dev) == 2 && (vp->v_iflag & VI_XLOCK) == 0) { 313 td->td_proc->p_session->s_ttyvp = NULL; 314 oldvp = vp; 315 } 316 VI_UNLOCK(vp); 317 SESS_UNLOCK(td->td_proc->p_session); 318 } 319 sx_xunlock(&proctree_lock); 320 if (oldvp != NULL) 321 vrele(oldvp); 322 /* 323 * We do not want to really close the device if it 324 * is still in use unless we are trying to close it 325 * forcibly. Since every use (buffer, vnode, swap, cmap) 326 * holds a reference to the vnode, and because we mark 327 * any other vnodes that alias this device, when the 328 * sum of the reference counts on all the aliased 329 * vnodes descends to one, we are on last close. 330 */ 331 dsw = dev_refthread(dev); 332 if (dsw == NULL) 333 return (ENXIO); 334 VI_LOCK(vp); 335 if (vp->v_iflag & VI_XLOCK) { 336 /* Forced close. */ 337 } else if (dsw->d_flags & D_TRACKCLOSE) { 338 /* Keep device updated on status. */ 339 } else if (count_dev(dev) > 1) { 340 VI_UNLOCK(vp); 341 dev_relthread(dev); 342 return (0); 343 } 344 VI_UNLOCK(vp); 345 KASSERT(dev->si_refcount > 0, 346 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 347 if (!(dsw->d_flags & D_NEEDGIANT)) { 348 DROP_GIANT(); 349 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 350 PICKUP_GIANT(); 351 } else 352 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 353 dev_relthread(dev); 354 return (error); 355} 356 357static int 358devfs_close_f(struct file *fp, struct thread *td) 359{ 360 361 return (vnops.fo_close(fp, td)); 362} 363 364/* 365 * Synch buffers associated with a block device 366 */ 367/* ARGSUSED */ 368static int 369devfs_fsync(ap) 370 struct vop_fsync_args /* { 371 struct vnode *a_vp; 372 struct ucred *a_cred; 373 int a_waitfor; 374 struct thread *a_td; 375 } */ *ap; 376{ 377 if (!vn_isdisk(ap->a_vp, NULL)) 378 return (0); 379 380 return (vop_stdfsync(ap)); 381} 382 383static int 384devfs_getattr(ap) 385 struct vop_getattr_args /* { 386 struct vnode *a_vp; 387 struct vattr *a_vap; 388 struct ucred *a_cred; 389 struct thread *a_td; 390 } */ *ap; 391{ 392 struct vnode *vp = ap->a_vp; 393 struct vattr *vap = ap->a_vap; 394 int error = 0; 395 struct devfs_dirent *de; 396 struct cdev *dev; 397 398 de = vp->v_data; 399 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 400 if (vp->v_type == VDIR) { 401 de = de->de_dir; 402 KASSERT(de != NULL, 403 ("Null dir dirent in devfs_getattr vp=%p", vp)); 404 } 405 bzero((caddr_t) vap, sizeof(*vap)); 406 vattr_null(vap); 407 vap->va_uid = de->de_uid; 408 vap->va_gid = de->de_gid; 409 vap->va_mode = de->de_mode; 410 if (vp->v_type == VLNK) 411 vap->va_size = strlen(de->de_symlink); 412 else if (vp->v_type == VDIR) 413 vap->va_size = vap->va_bytes = DEV_BSIZE; 414 else 415 vap->va_size = 0; 416 if (vp->v_type != VDIR) 417 vap->va_bytes = 0; 418 vap->va_blocksize = DEV_BSIZE; 419 vap->va_type = vp->v_type; 420 421#define fix(aa) \ 422 do { \ 423 if ((aa).tv_sec == 0) { \ 424 (aa).tv_sec = boottime.tv_sec; \ 425 (aa).tv_nsec = boottime.tv_usec * 1000; \ 426 } \ 427 } while (0) 428 429 if (vp->v_type != VCHR) { 430 fix(de->de_atime); 431 vap->va_atime = de->de_atime; 432 fix(de->de_mtime); 433 vap->va_mtime = de->de_mtime; 434 fix(de->de_ctime); 435 vap->va_ctime = de->de_ctime; 436 } else { 437 dev = vp->v_rdev; 438 fix(dev->si_atime); 439 vap->va_atime = dev->si_atime; 440 fix(dev->si_mtime); 441 vap->va_mtime = dev->si_mtime; 442 fix(dev->si_ctime); 443 vap->va_ctime = dev->si_ctime; 444 vap->va_rdev = dev->si_udev; 445 } 446 vap->va_gen = 0; 447 vap->va_flags = 0; 448 vap->va_nlink = de->de_links; 449 vap->va_fileid = de->de_inode; 450 451 return (error); 452} 453 454/* 455 * Device ioctl operation. 456 */ 457/* ARGSUSED */ 458static int 459devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 460{ 461 struct cdev *dev; 462 struct cdevsw *dsw; 463 struct vnode *vp; 464 struct vnode *vpold; 465 int error; 466 467 error = devfs_fp_check(fp, &dev, &dsw); 468 if (error) 469 return (error); 470 471 if (com == FIODTYPE) { 472 *(int *)data = dsw->d_flags & D_TYPEMASK; 473 dev_relthread(dev); 474 return (0); 475 } 476 if (dsw->d_flags & D_NEEDGIANT) 477 mtx_lock(&Giant); 478 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td); 479 if (dsw->d_flags & D_NEEDGIANT) 480 mtx_unlock(&Giant); 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} 511 512 513/* ARGSUSED */ 514static int 515devfs_kqfilter_f(struct file *fp, struct knote *kn) 516{ 517 struct cdev *dev; 518 struct cdevsw *dsw; 519 int error; 520 521 error = devfs_fp_check(fp, &dev, &dsw); 522 if (error) 523 return (error); 524 if (dsw->d_flags & D_NEEDGIANT) 525 mtx_lock(&Giant); 526 error = dsw->d_kqfilter(dev, kn); 527 if (dsw->d_flags & D_NEEDGIANT) 528 mtx_unlock(&Giant); 529 dev_relthread(dev); 530 return (error); 531} 532 533static int 534devfs_lookupx(ap) 535 struct vop_lookup_args /* { 536 struct vnode * a_dvp; 537 struct vnode ** a_vpp; 538 struct componentname * a_cnp; 539 } */ *ap; 540{ 541 struct componentname *cnp; 542 struct vnode *dvp, **vpp; 543 struct thread *td; 544 struct devfs_dirent *de, *dd; 545 struct devfs_dirent **dde; 546 struct devfs_mount *dmp; 547 struct cdev *cdev; 548 int error, flags, nameiop; 549 char specname[SPECNAMELEN + 1], *pname; 550 551 cnp = ap->a_cnp; 552 vpp = ap->a_vpp; 553 dvp = ap->a_dvp; 554 pname = cnp->cn_nameptr; 555 td = cnp->cn_thread; 556 flags = cnp->cn_flags; 557 nameiop = cnp->cn_nameiop; 558 dmp = VFSTODEVFS(dvp->v_mount); 559 dd = dvp->v_data; 560 561 *vpp = NULLVP; 562 cnp->cn_flags &= ~PDIRUNLOCK; 563 564 if ((flags & ISLASTCN) && nameiop == RENAME) 565 return (EOPNOTSUPP); 566 567 if (dvp->v_type != VDIR) 568 return (ENOTDIR); 569 570 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 571 return (EIO); 572 573 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 574 if (error) 575 return (error); 576 577 if (cnp->cn_namelen == 1 && *pname == '.') { 578 if ((flags & ISLASTCN) && nameiop != LOOKUP) 579 return (EINVAL); 580 *vpp = dvp; 581 VREF(dvp); 582 return (0); 583 } 584 585 if (flags & ISDOTDOT) { 586 if ((flags & ISLASTCN) && nameiop != LOOKUP) 587 return (EINVAL); 588 VOP_UNLOCK(dvp, 0, td); 589 cnp->cn_flags |= PDIRUNLOCK; 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 if (error || ((flags & LOCKPARENT) && (flags & ISLASTCN))) { 595 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 596 cnp->cn_flags &= ~PDIRUNLOCK; 597 } 598 return (error); 599 } 600 601 devfs_populate(dmp); 602 dd = dvp->v_data; 603 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 604 if (cnp->cn_namelen != de->de_dirent->d_namlen) 605 continue; 606 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 607 de->de_dirent->d_namlen) != 0) 608 continue; 609 if (de->de_flags & DE_WHITEOUT) 610 goto notfound; 611 goto found; 612 } 613 614 if (nameiop == DELETE) 615 goto notfound; 616 617 /* 618 * OK, we didn't have an entry for the name we were asked for 619 * so we try to see if anybody can create it on demand. 620 */ 621 pname = devfs_fqpn(specname, dvp, cnp); 622 if (pname == NULL) 623 goto notfound; 624 625 cdev = NULL; 626 EVENTHANDLER_INVOKE(dev_clone, pname, strlen(pname), &cdev); 627 if (cdev == NULL) 628 goto notfound; 629 630 devfs_populate(dmp); 631 632 dde = devfs_itode(dmp, cdev->si_inode); 633 634 if (dde == NULL || *dde == NULL || *dde == DE_DELETED) 635 goto notfound; 636 637 if ((*dde)->de_flags & DE_WHITEOUT) 638 goto notfound; 639 640 de = *dde; 641 goto found; 642 643notfound: 644 645 if ((nameiop == CREATE || nameiop == RENAME) && 646 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 647 cnp->cn_flags |= SAVENAME; 648 if (!(flags & LOCKPARENT)) { 649 VOP_UNLOCK(dvp, 0, td); 650 cnp->cn_flags |= PDIRUNLOCK; 651 } 652 return (EJUSTRETURN); 653 } 654 return (ENOENT); 655 656 657found: 658 659 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 660 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 661 if (error) 662 return (error); 663 if (*vpp == dvp) { 664 VREF(dvp); 665 *vpp = dvp; 666 return (0); 667 } 668 error = devfs_allocv(de, dvp->v_mount, vpp, td); 669 if (error) 670 return (error); 671 if (!(flags & LOCKPARENT)) { 672 VOP_UNLOCK(dvp, 0, td); 673 cnp->cn_flags |= PDIRUNLOCK; 674 } 675 return (0); 676 } 677 error = devfs_allocv(de, dvp->v_mount, vpp, td); 678 if (error) 679 return (error); 680 if (!(flags & LOCKPARENT) || !(flags & ISLASTCN)) { 681 VOP_UNLOCK(dvp, 0, td); 682 cnp->cn_flags |= PDIRUNLOCK; 683 } 684 return (0); 685} 686 687static int 688devfs_lookup(struct vop_lookup_args *ap) 689{ 690 int j; 691 struct devfs_mount *dmp; 692 693 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 694 lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread); 695 j = devfs_lookupx(ap); 696 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread); 697 return (j); 698} 699 700static int 701devfs_mknod(struct vop_mknod_args *ap) 702 /* 703 struct vop_mknod_args { 704 struct vnodeop_desc *a_desc; 705 struct vnode *a_dvp; 706 struct vnode **a_vpp; 707 struct componentname *a_cnp; 708 struct vattr *a_vap; 709 }; */ 710{ 711 struct componentname *cnp; 712 struct vnode *dvp, **vpp; 713 struct thread *td; 714 struct devfs_dirent *dd, *de; 715 struct devfs_mount *dmp; 716 int error; 717 718 dvp = ap->a_dvp; 719 dmp = VFSTODEVFS(dvp->v_mount); 720 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread); 721 722 cnp = ap->a_cnp; 723 vpp = ap->a_vpp; 724 td = cnp->cn_thread; 725 dd = dvp->v_data; 726 727 error = ENOENT; 728 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 729 if (cnp->cn_namelen != de->de_dirent->d_namlen) 730 continue; 731 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 732 de->de_dirent->d_namlen) != 0) 733 continue; 734 if (de->de_flags & DE_WHITEOUT) 735 break; 736 goto notfound; 737 } 738 if (de == NULL) 739 goto notfound; 740 de->de_flags &= ~DE_WHITEOUT; 741 error = devfs_allocv(de, dvp->v_mount, vpp, td); 742notfound: 743 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread); 744 return (error); 745} 746 747/* 748 * Open a special file. 749 */ 750/* ARGSUSED */ 751static int 752devfs_open(ap) 753 struct vop_open_args /* { 754 struct vnode *a_vp; 755 int a_mode; 756 struct ucred *a_cred; 757 struct thread *a_td; 758 int a_fdidx; 759 } */ *ap; 760{ 761 struct thread *td = ap->a_td; 762 struct vnode *vp = ap->a_vp; 763 struct cdev *dev = vp->v_rdev; 764 struct file *fp; 765 int error; 766 struct cdevsw *dsw; 767 768 if (vp->v_type == VBLK) 769 return (ENXIO); 770 771 if (dev == NULL) 772 return (ENXIO); 773 774 /* Make this field valid before any I/O in d_open. */ 775 if (dev->si_iosize_max == 0) 776 dev->si_iosize_max = DFLTPHYS; 777 778 if (vn_isdisk(vp, NULL) && 779 ap->a_cred != FSCRED && (ap->a_mode & FWRITE)) { 780 /* 781 * When running in very secure mode, do not allow 782 * opens for writing of any disks. 783 * XXX: should be in geom_dev.c, but we lack the cred there. 784 */ 785 error = securelevel_ge(td->td_ucred, 2); 786 if (error) 787 return (error); 788 } 789 790 dsw = dev_refthread(dev); 791 if (dsw == NULL) 792 return (ENXIO); 793 794 /* XXX: Special casing of ttys for deadfs. Probably redundant. */ 795 if (dsw->d_flags & D_TTY) 796 vp->v_vflag |= VV_ISTTY; 797 798 VOP_UNLOCK(vp, 0, td); 799 800 if(!(dsw->d_flags & D_NEEDGIANT)) { 801 DROP_GIANT(); 802 if (dsw->d_fdopen != NULL) 803 error = dsw->d_fdopen(dev, ap->a_mode, td, ap->a_fdidx); 804 else 805 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 806 PICKUP_GIANT(); 807 } else if (dsw->d_fdopen != NULL) 808 error = dsw->d_fdopen(dev, ap->a_mode, td, ap->a_fdidx); 809 else 810 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 811 812 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 813 814 dev_relthread(dev); 815 816 if (error) 817 return (error); 818 819#if 0 /* /dev/console */ 820 KASSERT(ap->a_fdidx >= 0, 821 ("Could not vnode bypass device on fd %d", ap->a_fdidx)); 822#else 823 if(ap->a_fdidx < 0) 824 return (error); 825#endif 826 /* 827 * This is a pretty disgustingly long chain, but I am not 828 * sure there is any better way. Passing the fdidx into 829 * VOP_OPEN() offers us more information than just passing 830 * the file *. 831 */ 832 fp = ap->a_td->td_proc->p_fd->fd_ofiles[ap->a_fdidx]; 833 KASSERT(fp->f_ops == &badfileops, 834 ("Could not vnode bypass device on fdops %p", fp->f_ops)); 835 fp->f_ops = &devfs_ops_f; 836 fp->f_data = dev; 837 return (error); 838} 839 840static int 841devfs_pathconf(ap) 842 struct vop_pathconf_args /* { 843 struct vnode *a_vp; 844 int a_name; 845 int *a_retval; 846 } */ *ap; 847{ 848 849 switch (ap->a_name) { 850 case _PC_NAME_MAX: 851 *ap->a_retval = NAME_MAX; 852 return (0); 853 case _PC_PATH_MAX: 854 *ap->a_retval = PATH_MAX; 855 return (0); 856 case _PC_MAC_PRESENT: 857#ifdef MAC 858 /* 859 * If MAC is enabled, devfs automatically supports 860 * trivial non-persistant label storage. 861 */ 862 *ap->a_retval = 1; 863#else 864 *ap->a_retval = 0; 865#endif 866 return (0); 867 default: 868 return (vop_stdpathconf(ap)); 869 } 870 /* NOTREACHED */ 871} 872 873/* ARGSUSED */ 874static int 875devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 876{ 877 struct cdev *dev; 878 struct cdevsw *dsw; 879 int error; 880 881 error = devfs_fp_check(fp, &dev, &dsw); 882 if (error) 883 return (error); 884 if (dsw->d_flags & D_NEEDGIANT) 885 mtx_lock(&Giant); 886 error = dsw->d_poll(dev, events, td); 887 if (dsw->d_flags & D_NEEDGIANT) 888 mtx_unlock(&Giant); 889 dev_relthread(dev); 890 return(error); 891} 892 893/* 894 * Print out the contents of a special device vnode. 895 */ 896static int 897devfs_print(ap) 898 struct vop_print_args /* { 899 struct vnode *a_vp; 900 } */ *ap; 901{ 902 903 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 904 return (0); 905} 906 907/* 908 * Vnode op for read 909 */ 910/* ARGSUSED */ 911static int 912devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 913{ 914 struct cdev *dev; 915 int ioflag, error, resid; 916 struct cdevsw *dsw; 917 918 error = devfs_fp_check(fp, &dev, &dsw); 919 if (error) 920 return (error); 921 resid = uio->uio_resid; 922 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 923 if (ioflag & O_DIRECT) 924 ioflag |= IO_DIRECT; 925 926 if ((flags & FOF_OFFSET) == 0) 927 uio->uio_offset = fp->f_offset; 928 929 if (dsw->d_flags & D_NEEDGIANT) 930 mtx_lock(&Giant); 931 error = dsw->d_read(dev, uio, ioflag); 932 if (dsw->d_flags & D_NEEDGIANT) 933 mtx_unlock(&Giant); 934 dev_relthread(dev); 935 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 936 vfs_timestamp(&dev->si_atime); 937 938 if ((flags & FOF_OFFSET) == 0) 939 fp->f_offset = uio->uio_offset; 940 fp->f_nextoff = uio->uio_offset; 941 return (error); 942} 943 944static int 945devfs_readdir(ap) 946 struct vop_readdir_args /* { 947 struct vnode *a_vp; 948 struct uio *a_uio; 949 struct ucred *a_cred; 950 int *a_eofflag; 951 int *a_ncookies; 952 u_long **a_cookies; 953 } */ *ap; 954{ 955 int error; 956 struct uio *uio; 957 struct dirent *dp; 958 struct devfs_dirent *dd; 959 struct devfs_dirent *de; 960 struct devfs_mount *dmp; 961 off_t off, oldoff; 962 int ncookies = 0; 963 u_long *cookiebuf, *cookiep; 964 struct dirent *dps, *dpe; 965 966 if (ap->a_vp->v_type != VDIR) 967 return (ENOTDIR); 968 969 uio = ap->a_uio; 970 if (uio->uio_offset < 0) 971 return (EINVAL); 972 973 dmp = VFSTODEVFS(ap->a_vp->v_mount); 974 lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread); 975 devfs_populate(dmp); 976 error = 0; 977 de = ap->a_vp->v_data; 978 off = 0; 979 oldoff = uio->uio_offset; 980 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 981 if (dd->de_flags & DE_WHITEOUT) 982 continue; 983 if (dd->de_dirent->d_type == DT_DIR) 984 de = dd->de_dir; 985 else 986 de = dd; 987 dp = dd->de_dirent; 988 if (dp->d_reclen > uio->uio_resid) 989 break; 990 dp->d_fileno = de->de_inode; 991 if (off >= uio->uio_offset) { 992 ncookies++; 993 error = uiomove(dp, dp->d_reclen, uio); 994 if (error) 995 break; 996 } 997 off += dp->d_reclen; 998 } 999 if( !error && ap->a_ncookies != NULL && ap->a_cookies != NULL ) { 1000 MALLOC(cookiebuf, u_long *, ncookies * sizeof(u_long), 1001 M_TEMP, M_WAITOK); 1002 cookiep = cookiebuf; 1003 dps = (struct dirent *)((char *)uio->uio_iov->iov_base - 1004 (uio->uio_offset - oldoff)); 1005 dpe = (struct dirent *) uio->uio_iov->iov_base; 1006 for( dp = dps; 1007 dp < dpe; 1008 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) { 1009 oldoff += dp->d_reclen; 1010 *cookiep++ = (u_long) oldoff; 1011 } 1012 *ap->a_ncookies = ncookies; 1013 *ap->a_cookies = cookiebuf; 1014 } 1015 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread); 1016 uio->uio_offset = off; 1017 return (error); 1018} 1019 1020static int 1021devfs_readlink(ap) 1022 struct vop_readlink_args /* { 1023 struct vnode *a_vp; 1024 struct uio *a_uio; 1025 struct ucred *a_cead; 1026 } */ *ap; 1027{ 1028 int error; 1029 struct devfs_dirent *de; 1030 1031 de = ap->a_vp->v_data; 1032 error = uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio); 1033 return (error); 1034} 1035 1036static int 1037devfs_reclaim(ap) 1038 struct vop_reclaim_args /* { 1039 struct vnode *a_vp; 1040 } */ *ap; 1041{ 1042 struct vnode *vp = ap->a_vp; 1043 struct devfs_dirent *de; 1044 int i; 1045 1046 de = vp->v_data; 1047 if (de != NULL) 1048 de->de_vnode = NULL; 1049 vp->v_data = NULL; 1050 if (vp->v_rdev != NULL) { 1051 i = vcount(vp); 1052 if ((vp->v_rdev->si_flags & SI_CHEAPCLONE) && i == 0 && 1053 (vp->v_rdev->si_flags & SI_NAMED)) 1054 destroy_dev(vp->v_rdev); 1055 } 1056 return (0); 1057} 1058 1059static int 1060devfs_remove(ap) 1061 struct vop_remove_args /* { 1062 struct vnode *a_dvp; 1063 struct vnode *a_vp; 1064 struct componentname *a_cnp; 1065 } */ *ap; 1066{ 1067 struct vnode *vp = ap->a_vp; 1068 struct devfs_dirent *dd; 1069 struct devfs_dirent *de; 1070 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1071 1072 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread); 1073 dd = ap->a_dvp->v_data; 1074 de = vp->v_data; 1075 if (de->de_dirent->d_type == DT_LNK) { 1076 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1077 if (de->de_vnode) 1078 de->de_vnode->v_data = NULL; 1079#ifdef MAC 1080 mac_destroy_devfsdirent(de); 1081#endif 1082 FREE(de, M_DEVFS); 1083 } else { 1084 de->de_flags |= DE_WHITEOUT; 1085 } 1086 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread); 1087 return (0); 1088} 1089 1090/* 1091 * Revoke is called on a tty when a terminal session ends. The vnode 1092 * is orphaned by setting v_op to deadfs so we need to let go of it 1093 * as well so that we create a new one next time around. 1094 */ 1095static int 1096devfs_revoke(ap) 1097 struct vop_revoke_args /* { 1098 struct vnode *a_vp; 1099 int a_flags; 1100 } */ *ap; 1101{ 1102 struct vnode *vp = ap->a_vp; 1103 struct vnode *vq; 1104 struct devfs_dirent *de; 1105 struct cdev *dev; 1106 1107 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1108 de = vp->v_data; 1109 de->de_vnode = NULL; 1110 1111 VI_LOCK(vp); 1112 /* 1113 * If a vgone (or vclean) is already in progress, 1114 * wait until it is done and return. 1115 */ 1116 if (vp->v_iflag & VI_XLOCK) { 1117 vp->v_iflag |= VI_XWANT; 1118 msleep(vp, VI_MTX(vp), PINOD | PDROP, "vop_revokeall", 0); 1119 return (0); 1120 } 1121 VI_UNLOCK(vp); 1122 dev = vp->v_rdev; 1123 for (;;) { 1124 dev_lock(); 1125 vq = SLIST_FIRST(&dev->si_hlist); 1126 dev_unlock(); 1127 if (vq == NULL) 1128 break; 1129 vgone(vq); 1130 } 1131 return (0); 1132} 1133 1134static int 1135devfs_rioctl(ap) 1136 struct vop_ioctl_args /* { 1137 struct vnode *a_vp; 1138 u_long a_command; 1139 caddr_t a_data; 1140 int a_fflag; 1141 struct ucred *a_cred; 1142 struct thread *a_td; 1143 } */ *ap; 1144{ 1145 int error; 1146 struct devfs_mount *dmp; 1147 1148 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1149 lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread); 1150 devfs_populate(dmp); 1151 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread); 1152 error = devfs_rules_ioctl(ap->a_vp->v_mount, ap->a_command, ap->a_data, 1153 ap->a_td); 1154 return (error); 1155} 1156 1157static int 1158devfs_rread(ap) 1159 struct vop_read_args /* { 1160 struct vnode *a_vp; 1161 struct uio *a_uio; 1162 int a_ioflag; 1163 struct ucred *a_cred; 1164 } */ *ap; 1165{ 1166 1167 if (ap->a_vp->v_type != VDIR) 1168 return (EINVAL); 1169 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1170} 1171 1172static int 1173devfs_setattr(ap) 1174 struct vop_setattr_args /* { 1175 struct vnode *a_vp; 1176 struct vattr *a_vap; 1177 struct ucred *a_cred; 1178 struct proc *a_p; 1179 } */ *ap; 1180{ 1181 struct devfs_dirent *de; 1182 struct vattr *vap; 1183 struct vnode *vp; 1184 int c, error; 1185 uid_t uid; 1186 gid_t gid; 1187 1188 vap = ap->a_vap; 1189 vp = ap->a_vp; 1190 if ((vap->va_type != VNON) || 1191 (vap->va_nlink != VNOVAL) || 1192 (vap->va_fsid != VNOVAL) || 1193 (vap->va_fileid != VNOVAL) || 1194 (vap->va_blocksize != VNOVAL) || 1195 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1196 (vap->va_rdev != VNOVAL) || 1197 ((int)vap->va_bytes != VNOVAL) || 1198 (vap->va_gen != VNOVAL)) { 1199 return (EINVAL); 1200 } 1201 1202 de = vp->v_data; 1203 if (vp->v_type == VDIR) 1204 de = de->de_dir; 1205 1206 error = c = 0; 1207 if (vap->va_uid == (uid_t)VNOVAL) 1208 uid = de->de_uid; 1209 else 1210 uid = vap->va_uid; 1211 if (vap->va_gid == (gid_t)VNOVAL) 1212 gid = de->de_gid; 1213 else 1214 gid = vap->va_gid; 1215 if (uid != de->de_uid || gid != de->de_gid) { 1216 if (((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1217 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) && 1218 (error = suser_cred(ap->a_td->td_ucred, SUSER_ALLOWJAIL)) != 0) 1219 return (error); 1220 de->de_uid = uid; 1221 de->de_gid = gid; 1222 c = 1; 1223 } 1224 1225 if (vap->va_mode != (mode_t)VNOVAL) { 1226 if ((ap->a_cred->cr_uid != de->de_uid) && 1227 (error = suser_cred(ap->a_td->td_ucred, SUSER_ALLOWJAIL))) 1228 return (error); 1229 de->de_mode = vap->va_mode; 1230 c = 1; 1231 } 1232 1233 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1234 /* See the comment in ufs_vnops::ufs_setattr(). */ 1235 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) && 1236 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1237 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td)))) 1238 return (error); 1239 if (vap->va_atime.tv_sec != VNOVAL) { 1240 if (vp->v_type == VCHR) 1241 vp->v_rdev->si_atime = vap->va_atime; 1242 else 1243 de->de_atime = vap->va_atime; 1244 } 1245 if (vap->va_mtime.tv_sec != VNOVAL) { 1246 if (vp->v_type == VCHR) 1247 vp->v_rdev->si_mtime = vap->va_mtime; 1248 else 1249 de->de_mtime = vap->va_mtime; 1250 } 1251 c = 1; 1252 } 1253 1254 if (c) { 1255 if (vp->v_type == VCHR) 1256 vfs_timestamp(&vp->v_rdev->si_ctime); 1257 else 1258 vfs_timestamp(&de->de_mtime); 1259 } 1260 return (0); 1261} 1262 1263#ifdef MAC 1264static int 1265devfs_setlabel(ap) 1266 struct vop_setlabel_args /* { 1267 struct vnode *a_vp; 1268 struct mac *a_label; 1269 struct ucred *a_cred; 1270 struct thread *a_td; 1271 } */ *ap; 1272{ 1273 struct vnode *vp; 1274 struct devfs_dirent *de; 1275 1276 vp = ap->a_vp; 1277 de = vp->v_data; 1278 1279 mac_relabel_vnode(ap->a_cred, vp, ap->a_label); 1280 mac_update_devfsdirent(vp->v_mount, de, vp); 1281 1282 return (0); 1283} 1284#endif 1285 1286static int 1287devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) 1288{ 1289 1290 return (vnops.fo_stat(fp, sb, cred, td)); 1291} 1292 1293static int 1294devfs_symlink(ap) 1295 struct vop_symlink_args /* { 1296 struct vnode *a_dvp; 1297 struct vnode **a_vpp; 1298 struct componentname *a_cnp; 1299 struct vattr *a_vap; 1300 char *a_target; 1301 } */ *ap; 1302{ 1303 int i, error; 1304 struct devfs_dirent *dd; 1305 struct devfs_dirent *de; 1306 struct devfs_mount *dmp; 1307 struct thread *td; 1308 1309 td = ap->a_cnp->cn_thread; 1310 KASSERT(td == curthread, ("devfs_symlink: td != curthread")); 1311 error = suser(td); 1312 if (error) 1313 return(error); 1314 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1315 dd = ap->a_dvp->v_data; 1316 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1317 de->de_uid = 0; 1318 de->de_gid = 0; 1319 de->de_mode = 0755; 1320 de->de_inode = dmp->dm_inode++; 1321 de->de_dirent->d_type = DT_LNK; 1322 i = strlen(ap->a_target) + 1; 1323 MALLOC(de->de_symlink, char *, i, M_DEVFS, M_WAITOK); 1324 bcopy(ap->a_target, de->de_symlink, i); 1325 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, td); 1326#ifdef MAC 1327 mac_create_devfs_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1328#endif 1329 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 1330 devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, td); 1331 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, td); 1332 return (0); 1333} 1334 1335/* 1336 * Vnode op for write 1337 */ 1338/* ARGSUSED */ 1339static int 1340devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 1341{ 1342 struct cdev *dev; 1343 struct vnode *vp; 1344 int error, ioflag, resid; 1345 struct cdevsw *dsw; 1346 1347 error = devfs_fp_check(fp, &dev, &dsw); 1348 if (error) 1349 return (error); 1350 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1351 vp = fp->f_vnode; 1352 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1353 if (ioflag & O_DIRECT) 1354 ioflag |= IO_DIRECT; 1355 if ((flags & FOF_OFFSET) == 0) 1356 uio->uio_offset = fp->f_offset; 1357 1358 resid = uio->uio_resid; 1359 1360 if (dsw->d_flags & D_NEEDGIANT) 1361 mtx_lock(&Giant); 1362 error = dsw->d_write(dev, uio, ioflag); 1363 if (dsw->d_flags & D_NEEDGIANT) 1364 mtx_unlock(&Giant); 1365 dev_relthread(dev); 1366 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1367 vfs_timestamp(&dev->si_ctime); 1368 dev->si_mtime = dev->si_ctime; 1369 } 1370 1371 if ((flags & FOF_OFFSET) == 0) 1372 fp->f_offset = uio->uio_offset; 1373 fp->f_nextoff = uio->uio_offset; 1374 return (error); 1375} 1376 1377static struct vop_vector devfs_vnodeops = { 1378 .vop_default = &default_vnodeops, 1379 1380 .vop_access = devfs_access, 1381 .vop_getattr = devfs_getattr, 1382 .vop_ioctl = devfs_rioctl, 1383 .vop_lookup = devfs_lookup, 1384 .vop_mknod = devfs_mknod, 1385 .vop_pathconf = devfs_pathconf, 1386 .vop_read = devfs_rread, 1387 .vop_readdir = devfs_readdir, 1388 .vop_readlink = devfs_readlink, 1389 .vop_reclaim = devfs_reclaim, 1390 .vop_remove = devfs_remove, 1391 .vop_revoke = devfs_revoke, 1392 .vop_setattr = devfs_setattr, 1393#ifdef MAC 1394 .vop_setlabel = devfs_setlabel, 1395#endif 1396 .vop_symlink = devfs_symlink, 1397}; 1398 1399static struct vop_vector devfs_specops = { 1400 .vop_default = &default_vnodeops, 1401 1402 .vop_access = devfs_access, 1403 .vop_advlock = devfs_advlock, 1404 .vop_bmap = VOP_PANIC, 1405 .vop_close = devfs_close, 1406 .vop_create = VOP_PANIC, 1407 .vop_fsync = devfs_fsync, 1408 .vop_getattr = devfs_getattr, 1409 .vop_lease = VOP_NULL, 1410 .vop_link = VOP_PANIC, 1411 .vop_mkdir = VOP_PANIC, 1412 .vop_mknod = VOP_PANIC, 1413 .vop_open = devfs_open, 1414 .vop_pathconf = devfs_pathconf, 1415 .vop_print = devfs_print, 1416 .vop_read = VOP_PANIC, 1417 .vop_readdir = VOP_PANIC, 1418 .vop_readlink = VOP_PANIC, 1419 .vop_reallocblks = VOP_PANIC, 1420 .vop_reclaim = devfs_reclaim, 1421 .vop_remove = devfs_remove, 1422 .vop_rename = VOP_PANIC, 1423 .vop_revoke = devfs_revoke, 1424 .vop_rmdir = VOP_PANIC, 1425 .vop_setattr = devfs_setattr, 1426#ifdef MAC 1427 .vop_setlabel = devfs_setlabel, 1428#endif 1429 .vop_strategy = VOP_PANIC, 1430 .vop_symlink = VOP_PANIC, 1431 .vop_write = VOP_PANIC, 1432}; 1433 1434/* 1435 * Our calling convention to the device drivers used to be that we passed 1436 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 1437 * flags instead since that's what open(), close() and ioctl() takes and 1438 * we don't really want vnode.h in device drivers. 1439 * We solved the source compatibility by redefining some vnode flags to 1440 * be the same as the fcntl ones and by sending down the bitwise OR of 1441 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 1442 * pulls the rug out under this. 1443 */ 1444CTASSERT(O_NONBLOCK == IO_NDELAY); 1445CTASSERT(O_FSYNC == IO_SYNC); 1446