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 static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data"); 77 78 struct mtx devfs_de_interlock; 79 MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF); 80 struct sx clone_drain_lock; 81 SX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock"); 82 struct mtx cdevpriv_mtx; 83 MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF); 84 85 static int 86 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp) 87 { 88 89 *dswp = devvn_refthread(fp->f_vnode, devp); 90 if (*devp != fp->f_data) { 91 if (*dswp != NULL) 92 dev_relthread(*devp); 93 return (ENXIO); 94 } 95 KASSERT((*devp)->si_refcount > 0, 96 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp))); 97 if (*dswp == NULL) 98 return (ENXIO); 99 curthread->td_fpop = fp; 100 return (0); 101 } 102 103 int 104 devfs_get_cdevpriv(void **datap) 105 { 106 struct file *fp; 107 struct cdev_privdata *p; 108 int error; 109 110 fp = curthread->td_fpop; 111 if (fp == NULL) 112 return (EBADF); 113 p = fp->f_cdevpriv; 114 if (p != NULL) { 115 error = 0; 116 *datap = p->cdpd_data; 117 } else 118 error = ENOENT; 119 return (error); 120 } 121 122 int 123 devfs_set_cdevpriv(void *priv, cdevpriv_dtr_t priv_dtr) 124 { 125 struct file *fp; 126 struct cdev_priv *cdp; 127 struct cdev_privdata *p; 128 int error; 129 130 fp = curthread->td_fpop; 131 if (fp == NULL) 132 return (ENOENT); 133 cdp = cdev2priv((struct cdev *)fp->f_data); 134 p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK); 135 p->cdpd_data = priv; 136 p->cdpd_dtr = priv_dtr; 137 p->cdpd_fp = fp; 138 mtx_lock(&cdevpriv_mtx); 139 if (fp->f_cdevpriv == NULL) { 140 LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list); 141 fp->f_cdevpriv = p; 142 mtx_unlock(&cdevpriv_mtx); 143 error = 0; 144 } else { 145 mtx_unlock(&cdevpriv_mtx); 146 free(p, M_CDEVPDATA); 147 error = EBUSY; 148 } 149 return (error); 150 } 151 152 void 153 devfs_destroy_cdevpriv(struct cdev_privdata *p) 154 { 155 156 mtx_assert(&cdevpriv_mtx, MA_OWNED); 157 p->cdpd_fp->f_cdevpriv = NULL; 158 LIST_REMOVE(p, cdpd_list); 159 mtx_unlock(&cdevpriv_mtx); 160 (p->cdpd_dtr)(p->cdpd_data); 161 free(p, M_CDEVPDATA); 162 } 163 164 void 165 devfs_fpdrop(struct file *fp) 166 { 167 struct cdev_privdata *p; 168 169 mtx_lock(&cdevpriv_mtx); 170 if ((p = fp->f_cdevpriv) == NULL) { 171 mtx_unlock(&cdevpriv_mtx); 172 return; 173 } 174 devfs_destroy_cdevpriv(p); 175 } 176 177 void 178 devfs_clear_cdevpriv(void) 179 { 180 struct file *fp; 181 182 fp = curthread->td_fpop; 183 if (fp == NULL) 184 return; 185 devfs_fpdrop(fp); 186 } 187 188 /* 189 * Construct the fully qualified path name relative to the mountpoint 190 */ 191 static char * 192 devfs_fqpn(char *buf, struct vnode *dvp, struct componentname *cnp) 193 { 194 int i; 195 struct devfs_dirent *de, *dd; 196 struct devfs_mount *dmp; 197 198 dmp = VFSTODEVFS(dvp->v_mount); 199 dd = dvp->v_data; 200 i = SPECNAMELEN; 201 buf[i] = '\0'; 202 i -= cnp->cn_namelen; 203 if (i < 0) 204 return (NULL); 205 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); 206 de = dd; 207 while (de != dmp->dm_rootdir) { 208 i--; 209 if (i < 0) 210 return (NULL); 211 buf[i] = '/'; 212 i -= de->de_dirent->d_namlen; 213 if (i < 0) 214 return (NULL); 215 bcopy(de->de_dirent->d_name, buf + i, 216 de->de_dirent->d_namlen); 217 de = TAILQ_FIRST(&de->de_dlist); /* "." */ 218 de = TAILQ_NEXT(de, de_list); /* ".." */ 219 de = de->de_dir; 220 } 221 return (buf + i); 222 } 223 224 static int 225 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp, 226 struct devfs_dirent *de) 227 { 228 int not_found; 229 230 not_found = 0; 231 if (de->de_flags & DE_DOOMED) 232 not_found = 1; 233 if (DEVFS_DE_DROP(de)) { 234 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed")); 235 devfs_dirent_free(de); 236 } 237 if (DEVFS_DMP_DROP(dmp)) { 238 KASSERT(not_found == 1, 239 ("DEVFS mount struct freed before dirent")); 240 not_found = 2; 241 sx_xunlock(&dmp->dm_lock); 242 devfs_unmount_final(dmp); 243 } 244 if (not_found == 1 || (drop_dm_lock && not_found != 2)) 245 sx_unlock(&dmp->dm_lock); 246 return (not_found); 247 } 248 249 static void 250 devfs_insmntque_dtr(struct vnode *vp, void *arg) 251 { 252 struct devfs_dirent *de; 253 254 de = (struct devfs_dirent *)arg; 255 mtx_lock(&devfs_de_interlock); 256 vp->v_data = NULL; 257 de->de_vnode = NULL; 258 mtx_unlock(&devfs_de_interlock); 259 vgone(vp); 260 vput(vp); 261 } 262 263 /* 264 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops 265 * it on return. 266 */ 267 int 268 devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td) 269 { 270 int error; 271 struct vnode *vp; 272 struct cdev *dev; 273 struct devfs_mount *dmp; 274 275 KASSERT(td == curthread, ("devfs_allocv: td != curthread")); 276 dmp = VFSTODEVFS(mp); 277 if (de->de_flags & DE_DOOMED) { 278 sx_xunlock(&dmp->dm_lock); 279 return (ENOENT); 280 } 281 DEVFS_DE_HOLD(de); 282 DEVFS_DMP_HOLD(dmp); 283 mtx_lock(&devfs_de_interlock); 284 vp = de->de_vnode; 285 if (vp != NULL) { 286 VI_LOCK(vp); 287 mtx_unlock(&devfs_de_interlock); 288 sx_xunlock(&dmp->dm_lock); 289 error = vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td); 290 sx_xlock(&dmp->dm_lock); 291 if (devfs_allocv_drop_refs(0, dmp, de)) { 292 if (error == 0) 293 vput(vp); 294 return (ENOENT); 295 } 296 else if (error) { 297 sx_xunlock(&dmp->dm_lock); 298 return (error); 299 } 300 sx_xunlock(&dmp->dm_lock); 301 *vpp = vp; 302 return (0); 303 } 304 mtx_unlock(&devfs_de_interlock); 305 if (de->de_dirent->d_type == DT_CHR) { 306 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { 307 devfs_allocv_drop_refs(1, dmp, de); 308 return (ENOENT); 309 } 310 dev = &de->de_cdp->cdp_c; 311 } else { 312 dev = NULL; 313 } 314 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 315 if (error != 0) { 316 devfs_allocv_drop_refs(1, dmp, de); 317 printf("devfs_allocv: failed to allocate new vnode\n"); 318 return (error); 319 } 320 321 if (de->de_dirent->d_type == DT_CHR) { 322 vp->v_type = VCHR; 323 VI_LOCK(vp); 324 dev_lock(); 325 dev_refl(dev); 326 /* XXX: v_rdev should be protect by vnode lock */ 327 vp->v_rdev = dev; 328 KASSERT(vp->v_usecount == 1, 329 ("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount)); 330 dev->si_usecount += vp->v_usecount; 331 dev_unlock(); 332 VI_UNLOCK(vp); 333 vp->v_op = &devfs_specops; 334 } else if (de->de_dirent->d_type == DT_DIR) { 335 vp->v_type = VDIR; 336 } else if (de->de_dirent->d_type == DT_LNK) { 337 vp->v_type = VLNK; 338 } else { 339 vp->v_type = VBAD; 340 } 341 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS); 342 mtx_lock(&devfs_de_interlock); 343 vp->v_data = de; 344 de->de_vnode = vp; 345 mtx_unlock(&devfs_de_interlock); 346 error = insmntque1(vp, mp, devfs_insmntque_dtr, de); 347 if (error != 0) { 348 (void) devfs_allocv_drop_refs(1, dmp, de); 349 return (error); 350 } 351 if (devfs_allocv_drop_refs(0, dmp, de)) { 352 vput(vp); 353 return (ENOENT); 354 } 355 #ifdef MAC 356 mac_devfs_vnode_associate(mp, de, vp); 357 #endif 358 sx_xunlock(&dmp->dm_lock); 359 *vpp = vp; 360 return (0); 361 } 362 363 static int 364 devfs_access(struct vop_access_args *ap) 365 { 366 struct vnode *vp = ap->a_vp; 367 struct devfs_dirent *de; 368 int error; 369 370 de = vp->v_data; 371 if (vp->v_type == VDIR) 372 de = de->de_dir; 373 374 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 375 ap->a_mode, ap->a_cred, NULL); 376 if (!error) 377 return (error); 378 if (error != EACCES) 379 return (error); 380 /* We do, however, allow access to the controlling terminal */ 381 if (!(ap->a_td->td_proc->p_flag & P_CONTROLT)) 382 return (error); 383 if (ap->a_td->td_proc->p_session->s_ttyvp == de->de_vnode) 384 return (0); 385 return (error); 386 } 387 388 /* ARGSUSED */ 389 static int 390 devfs_advlock(struct vop_advlock_args *ap) 391 { 392 393 return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL); 394 } 395 396 /* ARGSUSED */ 397 static int 398 devfs_close(struct vop_close_args *ap) 399 { 400 struct vnode *vp = ap->a_vp, *oldvp; 401 struct thread *td = ap->a_td; 402 struct cdev *dev = vp->v_rdev; 403 struct cdevsw *dsw; 404 int vp_locked, error; 405 406 /* 407 * Hack: a tty device that is a controlling terminal 408 * has a reference from the session structure. 409 * We cannot easily tell that a character device is 410 * a controlling terminal, unless it is the closing 411 * process' controlling terminal. In that case, 412 * if the reference count is 2 (this last descriptor 413 * plus the session), release the reference from the session. 414 */ 415 oldvp = NULL; 416 sx_xlock(&proctree_lock); 417 if (td && vp == td->td_proc->p_session->s_ttyvp) { 418 SESS_LOCK(td->td_proc->p_session); 419 VI_LOCK(vp); 420 if (count_dev(dev) == 2 && (vp->v_iflag & VI_DOOMED) == 0) { 421 td->td_proc->p_session->s_ttyvp = NULL; 422 oldvp = vp; 423 } 424 VI_UNLOCK(vp); 425 SESS_UNLOCK(td->td_proc->p_session); 426 } 427 sx_xunlock(&proctree_lock); 428 if (oldvp != NULL) 429 vrele(oldvp); 430 /* 431 * We do not want to really close the device if it 432 * is still in use unless we are trying to close it 433 * forcibly. Since every use (buffer, vnode, swap, cmap) 434 * holds a reference to the vnode, and because we mark 435 * any other vnodes that alias this device, when the 436 * sum of the reference counts on all the aliased 437 * vnodes descends to one, we are on last close. 438 */ 439 dsw = dev_refthread(dev); 440 if (dsw == NULL) 441 return (ENXIO); 442 VI_LOCK(vp); 443 if (vp->v_iflag & VI_DOOMED) { 444 /* Forced close. */ 445 } else if (dsw->d_flags & D_TRACKCLOSE) { 446 /* Keep device updated on status. */ 447 } else if (count_dev(dev) > 1) { 448 VI_UNLOCK(vp); 449 dev_relthread(dev); 450 return (0); 451 } 452 vholdl(vp); 453 VI_UNLOCK(vp); 454 vp_locked = VOP_ISLOCKED(vp); 455 VOP_UNLOCK(vp, 0); 456 KASSERT(dev->si_refcount > 0, 457 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 458 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 459 dev_relthread(dev); 460 vn_lock(vp, vp_locked | LK_RETRY); 461 vdrop(vp); 462 return (error); 463 } 464 465 static int 466 devfs_close_f(struct file *fp, struct thread *td) 467 { 468 int error; 469 470 curthread->td_fpop = fp; 471 error = vnops.fo_close(fp, td); 472 curthread->td_fpop = NULL; 473 return (error); 474 } 475 476 /* ARGSUSED */ 477 static int 478 devfs_fsync(struct vop_fsync_args *ap) 479 { 480 if (!vn_isdisk(ap->a_vp, NULL)) 481 return (0); 482 483 return (vop_stdfsync(ap)); 484 } 485 486 static int 487 devfs_getattr(struct vop_getattr_args *ap) 488 { 489 struct vnode *vp = ap->a_vp; 490 struct vattr *vap = ap->a_vap; 491 int error = 0; 492 struct devfs_dirent *de; 493 struct cdev *dev; 494 495 de = vp->v_data; 496 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 497 if (vp->v_type == VDIR) { 498 de = de->de_dir; 499 KASSERT(de != NULL, 500 ("Null dir dirent in devfs_getattr vp=%p", vp)); 501 } 502 bzero((caddr_t) vap, sizeof(*vap)); 503 vattr_null(vap); 504 vap->va_uid = de->de_uid; 505 vap->va_gid = de->de_gid; 506 vap->va_mode = de->de_mode; 507 if (vp->v_type == VLNK) 508 vap->va_size = strlen(de->de_symlink); 509 else if (vp->v_type == VDIR) 510 vap->va_size = vap->va_bytes = DEV_BSIZE; 511 else 512 vap->va_size = 0; 513 if (vp->v_type != VDIR) 514 vap->va_bytes = 0; 515 vap->va_blocksize = DEV_BSIZE; 516 vap->va_type = vp->v_type; 517 518 #define fix(aa) \ 519 do { \ 520 if ((aa).tv_sec <= 3600) { \ 521 (aa).tv_sec = boottime.tv_sec; \ 522 (aa).tv_nsec = boottime.tv_usec * 1000; \ 523 } \ 524 } while (0) 525 526 if (vp->v_type != VCHR) { 527 fix(de->de_atime); 528 vap->va_atime = de->de_atime; 529 fix(de->de_mtime); 530 vap->va_mtime = de->de_mtime; 531 fix(de->de_ctime); 532 vap->va_ctime = de->de_ctime; 533 } else { 534 dev = vp->v_rdev; 535 fix(dev->si_atime); 536 vap->va_atime = dev->si_atime; 537 fix(dev->si_mtime); 538 vap->va_mtime = dev->si_mtime; 539 fix(dev->si_ctime); 540 vap->va_ctime = dev->si_ctime; 541 542 vap->va_rdev = cdev2priv(dev)->cdp_inode; 543 } 544 vap->va_gen = 0; 545 vap->va_flags = 0; 546 vap->va_nlink = de->de_links; 547 vap->va_fileid = de->de_inode; 548 549 return (error); 550 } 551 552 /* ARGSUSED */ 553 static int 554 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 555 { 556 struct cdev *dev; 557 struct cdevsw *dsw; 558 struct vnode *vp; 559 struct vnode *vpold; 560 int error, i; 561 const char *p; 562 struct fiodgname_arg *fgn; 563 564 error = devfs_fp_check(fp, &dev, &dsw); 565 if (error) 566 return (error); 567 568 if (com == FIODTYPE) { 569 *(int *)data = dsw->d_flags & D_TYPEMASK; 570 td->td_fpop = NULL; 571 dev_relthread(dev); 572 return (0); 573 } else if (com == FIODGNAME) { 574 fgn = data; 575 p = devtoname(dev); 576 i = strlen(p) + 1; 577 if (i > fgn->len) 578 error = EINVAL; 579 else 580 error = copyout(p, fgn->buf, i); 581 td->td_fpop = NULL; 582 dev_relthread(dev); 583 return (error); 584 } 585 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td); 586 td->td_fpop = NULL; 587 dev_relthread(dev); 588 if (error == ENOIOCTL) 589 error = ENOTTY; 590 if (error == 0 && com == TIOCSCTTY) { 591 vp = fp->f_vnode; 592 593 /* Do nothing if reassigning same control tty */ 594 sx_slock(&proctree_lock); 595 if (td->td_proc->p_session->s_ttyvp == vp) { 596 sx_sunlock(&proctree_lock); 597 return (0); 598 } 599 600 vpold = td->td_proc->p_session->s_ttyvp; 601 VREF(vp); 602 SESS_LOCK(td->td_proc->p_session); 603 td->td_proc->p_session->s_ttyvp = vp; 604 SESS_UNLOCK(td->td_proc->p_session); 605 606 sx_sunlock(&proctree_lock); 607 608 /* Get rid of reference to old control tty */ 609 if (vpold) 610 vrele(vpold); 611 } 612 return (error); 613 } 614 615 /* ARGSUSED */ 616 static int 617 devfs_kqfilter_f(struct file *fp, struct knote *kn) 618 { 619 struct cdev *dev; 620 struct cdevsw *dsw; 621 int error; 622 623 error = devfs_fp_check(fp, &dev, &dsw); 624 if (error) 625 return (error); 626 error = dsw->d_kqfilter(dev, kn); 627 curthread->td_fpop = NULL; 628 dev_relthread(dev); 629 return (error); 630 } 631 632 static int 633 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 634 { 635 struct componentname *cnp; 636 struct vnode *dvp, **vpp; 637 struct thread *td; 638 struct devfs_dirent *de, *dd; 639 struct devfs_dirent **dde; 640 struct devfs_mount *dmp; 641 struct cdev *cdev; 642 int error, flags, nameiop; 643 char specname[SPECNAMELEN + 1], *pname; 644 645 cnp = ap->a_cnp; 646 vpp = ap->a_vpp; 647 dvp = ap->a_dvp; 648 pname = cnp->cn_nameptr; 649 td = cnp->cn_thread; 650 flags = cnp->cn_flags; 651 nameiop = cnp->cn_nameiop; 652 dmp = VFSTODEVFS(dvp->v_mount); 653 dd = dvp->v_data; 654 *vpp = NULLVP; 655 656 if ((flags & ISLASTCN) && nameiop == RENAME) 657 return (EOPNOTSUPP); 658 659 if (dvp->v_type != VDIR) 660 return (ENOTDIR); 661 662 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 663 return (EIO); 664 665 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 666 if (error) 667 return (error); 668 669 if (cnp->cn_namelen == 1 && *pname == '.') { 670 if ((flags & ISLASTCN) && nameiop != LOOKUP) 671 return (EINVAL); 672 *vpp = dvp; 673 VREF(dvp); 674 return (0); 675 } 676 677 if (flags & ISDOTDOT) { 678 if ((flags & ISLASTCN) && nameiop != LOOKUP) 679 return (EINVAL); 680 VOP_UNLOCK(dvp, 0); 681 de = TAILQ_FIRST(&dd->de_dlist); /* "." */ 682 de = TAILQ_NEXT(de, de_list); /* ".." */ 683 de = de->de_dir; 684 error = devfs_allocv(de, dvp->v_mount, vpp, td); 685 *dm_unlock = 0; 686 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 687 return (error); 688 } 689 690 DEVFS_DMP_HOLD(dmp); 691 devfs_populate(dmp); 692 if (DEVFS_DMP_DROP(dmp)) { 693 *dm_unlock = 0; 694 sx_xunlock(&dmp->dm_lock); 695 devfs_unmount_final(dmp); 696 return (ENOENT); 697 } 698 dd = dvp->v_data; 699 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen); 700 while (de == NULL) { /* While(...) so we can use break */ 701 702 if (nameiop == DELETE) 703 return (ENOENT); 704 705 /* 706 * OK, we didn't have an entry for the name we were asked for 707 * so we try to see if anybody can create it on demand. 708 */ 709 pname = devfs_fqpn(specname, dvp, cnp); 710 if (pname == NULL) 711 break; 712 713 cdev = NULL; 714 DEVFS_DMP_HOLD(dmp); 715 sx_xunlock(&dmp->dm_lock); 716 sx_slock(&clone_drain_lock); 717 EVENTHANDLER_INVOKE(dev_clone, 718 td->td_ucred, pname, strlen(pname), &cdev); 719 sx_sunlock(&clone_drain_lock); 720 sx_xlock(&dmp->dm_lock); 721 if (DEVFS_DMP_DROP(dmp)) { 722 *dm_unlock = 0; 723 sx_xunlock(&dmp->dm_lock); 724 devfs_unmount_final(dmp); 725 return (ENOENT); 726 } 727 if (cdev == NULL) 728 break; 729 730 DEVFS_DMP_HOLD(dmp); 731 devfs_populate(dmp); 732 if (DEVFS_DMP_DROP(dmp)) { 733 *dm_unlock = 0; 734 sx_xunlock(&dmp->dm_lock); 735 devfs_unmount_final(dmp); 736 return (ENOENT); 737 } 738 739 dev_lock(); 740 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx]; 741 if (dde != NULL && *dde != NULL) 742 de = *dde; 743 dev_unlock(); 744 dev_rel(cdev); 745 break; 746 } 747 748 if (de == NULL || de->de_flags & DE_WHITEOUT) { 749 if ((nameiop == CREATE || nameiop == RENAME) && 750 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 751 cnp->cn_flags |= SAVENAME; 752 return (EJUSTRETURN); 753 } 754 return (ENOENT); 755 } 756 757 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 758 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 759 if (error) 760 return (error); 761 if (*vpp == dvp) { 762 VREF(dvp); 763 *vpp = dvp; 764 return (0); 765 } 766 } 767 error = devfs_allocv(de, dvp->v_mount, vpp, td); 768 *dm_unlock = 0; 769 return (error); 770 } 771 772 static int 773 devfs_lookup(struct vop_lookup_args *ap) 774 { 775 int j; 776 struct devfs_mount *dmp; 777 int dm_unlock; 778 779 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 780 dm_unlock = 1; 781 sx_xlock(&dmp->dm_lock); 782 j = devfs_lookupx(ap, &dm_unlock); 783 if (dm_unlock == 1) 784 sx_xunlock(&dmp->dm_lock); 785 return (j); 786 } 787 788 static int 789 devfs_mknod(struct vop_mknod_args *ap) 790 { 791 struct componentname *cnp; 792 struct vnode *dvp, **vpp; 793 struct thread *td; 794 struct devfs_dirent *dd, *de; 795 struct devfs_mount *dmp; 796 int error; 797 798 /* 799 * The only type of node we should be creating here is a 800 * character device, for anything else return EOPNOTSUPP. 801 */ 802 if (ap->a_vap->va_type != VCHR) 803 return (EOPNOTSUPP); 804 dvp = ap->a_dvp; 805 dmp = VFSTODEVFS(dvp->v_mount); 806 807 cnp = ap->a_cnp; 808 vpp = ap->a_vpp; 809 td = cnp->cn_thread; 810 dd = dvp->v_data; 811 812 error = ENOENT; 813 sx_xlock(&dmp->dm_lock); 814 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 815 if (cnp->cn_namelen != de->de_dirent->d_namlen) 816 continue; 817 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 818 de->de_dirent->d_namlen) != 0) 819 continue; 820 if (de->de_flags & DE_WHITEOUT) 821 break; 822 goto notfound; 823 } 824 if (de == NULL) 825 goto notfound; 826 de->de_flags &= ~DE_WHITEOUT; 827 error = devfs_allocv(de, dvp->v_mount, vpp, td); 828 return (error); 829 notfound: 830 sx_xunlock(&dmp->dm_lock); 831 return (error); 832 } 833 834 /* ARGSUSED */ 835 static int 836 devfs_open(struct vop_open_args *ap) 837 { 838 struct thread *td = ap->a_td; 839 struct vnode *vp = ap->a_vp; 840 struct cdev *dev = vp->v_rdev; 841 struct file *fp = ap->a_fp; 842 int error; 843 struct cdevsw *dsw; 844 845 if (vp->v_type == VBLK) 846 return (ENXIO); 847 848 if (dev == NULL) 849 return (ENXIO); 850 851 /* Make this field valid before any I/O in d_open. */ 852 if (dev->si_iosize_max == 0) 853 dev->si_iosize_max = DFLTPHYS; 854 855 dsw = dev_refthread(dev); 856 if (dsw == NULL) 857 return (ENXIO); 858 859 /* XXX: Special casing of ttys for deadfs. Probably redundant. */ 860 if (dsw->d_flags & D_TTY) 861 vp->v_vflag |= VV_ISTTY; 862 863 VOP_UNLOCK(vp, 0); 864 865 if (fp != NULL) { 866 td->td_fpop = fp; 867 fp->f_data = dev; 868 } 869 if (dsw->d_fdopen != NULL) 870 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 871 else 872 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 873 td->td_fpop = NULL; 874 875 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 876 877 dev_relthread(dev); 878 879 if (error) 880 return (error); 881 882 #if 0 /* /dev/console */ 883 KASSERT(fp != NULL, 884 ("Could not vnode bypass device on NULL fp")); 885 #else 886 if(fp == NULL) 887 return (error); 888 #endif 889 if (fp->f_ops == &badfileops) 890 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f); 891 return (error); 892 } 893 894 static int 895 devfs_pathconf(struct vop_pathconf_args *ap) 896 { 897 898 switch (ap->a_name) { 899 case _PC_MAC_PRESENT: 900 #ifdef MAC 901 /* 902 * If MAC is enabled, devfs automatically supports 903 * trivial non-persistant label storage. 904 */ 905 *ap->a_retval = 1; 906 #else 907 *ap->a_retval = 0; 908 #endif 909 return (0); 910 default: 911 return (vop_stdpathconf(ap)); 912 } 913 /* NOTREACHED */ 914 } 915 916 /* ARGSUSED */ 917 static int 918 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 919 { 920 struct cdev *dev; 921 struct cdevsw *dsw; 922 int error; 923 924 error = devfs_fp_check(fp, &dev, &dsw); 925 if (error) 926 return (error); 927 error = dsw->d_poll(dev, events, td); 928 curthread->td_fpop = NULL; 929 dev_relthread(dev); 930 return(error); 931 } 932 933 /* 934 * Print out the contents of a special device vnode. 935 */ 936 static int 937 devfs_print(struct vop_print_args *ap) 938 { 939 940 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 941 return (0); 942 } 943 944 /* ARGSUSED */ 945 static int 946 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 947 { 948 struct cdev *dev; 949 int ioflag, error, resid; 950 struct cdevsw *dsw; 951 952 error = devfs_fp_check(fp, &dev, &dsw); 953 if (error) 954 return (error); 955 resid = uio->uio_resid; 956 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 957 if (ioflag & O_DIRECT) 958 ioflag |= IO_DIRECT; 959 960 if ((flags & FOF_OFFSET) == 0) 961 uio->uio_offset = fp->f_offset; 962 963 error = dsw->d_read(dev, uio, ioflag); 964 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 965 vfs_timestamp(&dev->si_atime); 966 curthread->td_fpop = NULL; 967 dev_relthread(dev); 968 969 if ((flags & FOF_OFFSET) == 0) 970 fp->f_offset = uio->uio_offset; 971 fp->f_nextoff = uio->uio_offset; 972 return (error); 973 } 974 975 static int 976 devfs_readdir(struct vop_readdir_args *ap) 977 { 978 int error; 979 struct uio *uio; 980 struct dirent *dp; 981 struct devfs_dirent *dd; 982 struct devfs_dirent *de; 983 struct devfs_mount *dmp; 984 off_t off, oldoff; 985 int *tmp_ncookies = NULL; 986 987 if (ap->a_vp->v_type != VDIR) 988 return (ENOTDIR); 989 990 uio = ap->a_uio; 991 if (uio->uio_offset < 0) 992 return (EINVAL); 993 994 /* 995 * XXX: This is a temporary hack to get around this filesystem not 996 * supporting cookies. We store the location of the ncookies pointer 997 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 998 * and set the number of cookies to 0. We then set the pointer to 999 * NULL so that vfs_read_dirent doesn't try to call realloc() on 1000 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 1001 * pointer to its original location before returning to the caller. 1002 */ 1003 if (ap->a_ncookies != NULL) { 1004 tmp_ncookies = ap->a_ncookies; 1005 *ap->a_ncookies = 0; 1006 ap->a_ncookies = NULL; 1007 } 1008 1009 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1010 sx_xlock(&dmp->dm_lock); 1011 DEVFS_DMP_HOLD(dmp); 1012 devfs_populate(dmp); 1013 if (DEVFS_DMP_DROP(dmp)) { 1014 sx_xunlock(&dmp->dm_lock); 1015 devfs_unmount_final(dmp); 1016 if (tmp_ncookies != NULL) 1017 ap->a_ncookies = tmp_ncookies; 1018 return (EIO); 1019 } 1020 error = 0; 1021 de = ap->a_vp->v_data; 1022 off = 0; 1023 oldoff = uio->uio_offset; 1024 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 1025 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 1026 if (dd->de_flags & DE_WHITEOUT) 1027 continue; 1028 if (dd->de_dirent->d_type == DT_DIR) 1029 de = dd->de_dir; 1030 else 1031 de = dd; 1032 dp = dd->de_dirent; 1033 if (dp->d_reclen > uio->uio_resid) 1034 break; 1035 dp->d_fileno = de->de_inode; 1036 if (off >= uio->uio_offset) { 1037 error = vfs_read_dirent(ap, dp, off); 1038 if (error) 1039 break; 1040 } 1041 off += dp->d_reclen; 1042 } 1043 sx_xunlock(&dmp->dm_lock); 1044 uio->uio_offset = off; 1045 1046 /* 1047 * Restore ap->a_ncookies if it wasn't originally NULL in the first 1048 * place. 1049 */ 1050 if (tmp_ncookies != NULL) 1051 ap->a_ncookies = tmp_ncookies; 1052 1053 return (error); 1054 } 1055 1056 static int 1057 devfs_readlink(struct vop_readlink_args *ap) 1058 { 1059 struct devfs_dirent *de; 1060 1061 de = ap->a_vp->v_data; 1062 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 1063 } 1064 1065 static int 1066 devfs_reclaim(struct vop_reclaim_args *ap) 1067 { 1068 struct vnode *vp = ap->a_vp; 1069 struct devfs_dirent *de; 1070 struct cdev *dev; 1071 1072 mtx_lock(&devfs_de_interlock); 1073 de = vp->v_data; 1074 if (de != NULL) { 1075 de->de_vnode = NULL; 1076 vp->v_data = NULL; 1077 } 1078 mtx_unlock(&devfs_de_interlock); 1079 1080 vnode_destroy_vobject(vp); 1081 1082 VI_LOCK(vp); 1083 dev_lock(); 1084 dev = vp->v_rdev; 1085 vp->v_rdev = NULL; 1086 1087 if (dev == NULL) { 1088 dev_unlock(); 1089 VI_UNLOCK(vp); 1090 return (0); 1091 } 1092 1093 dev->si_usecount -= vp->v_usecount; 1094 dev_unlock(); 1095 VI_UNLOCK(vp); 1096 dev_rel(dev); 1097 return (0); 1098 } 1099 1100 static int 1101 devfs_remove(struct vop_remove_args *ap) 1102 { 1103 struct vnode *vp = ap->a_vp; 1104 struct devfs_dirent *dd; 1105 struct devfs_dirent *de; 1106 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1107 1108 sx_xlock(&dmp->dm_lock); 1109 dd = ap->a_dvp->v_data; 1110 de = vp->v_data; 1111 if (de->de_cdp == NULL) { 1112 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1113 devfs_delete(dmp, de, 1); 1114 } else { 1115 de->de_flags |= DE_WHITEOUT; 1116 } 1117 sx_xunlock(&dmp->dm_lock); 1118 return (0); 1119 } 1120 1121 /* 1122 * Revoke is called on a tty when a terminal session ends. The vnode 1123 * is orphaned by setting v_op to deadfs so we need to let go of it 1124 * as well so that we create a new one next time around. 1125 * 1126 */ 1127 static int 1128 devfs_revoke(struct vop_revoke_args *ap) 1129 { 1130 struct vnode *vp = ap->a_vp, *vp2; 1131 struct cdev *dev; 1132 struct cdev_priv *cdp; 1133 struct devfs_dirent *de; 1134 int i; 1135 1136 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1137 1138 dev = vp->v_rdev; 1139 cdp = cdev2priv(dev); 1140 1141 dev_lock(); 1142 cdp->cdp_inuse++; 1143 dev_unlock(); 1144 1145 vhold(vp); 1146 vgone(vp); 1147 vdrop(vp); 1148 1149 VOP_UNLOCK(vp,0); 1150 loop: 1151 for (;;) { 1152 mtx_lock(&devfs_de_interlock); 1153 dev_lock(); 1154 vp2 = NULL; 1155 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1156 de = cdp->cdp_dirents[i]; 1157 if (de == NULL) 1158 continue; 1159 1160 vp2 = de->de_vnode; 1161 if (vp2 != NULL) { 1162 dev_unlock(); 1163 VI_LOCK(vp2); 1164 mtx_unlock(&devfs_de_interlock); 1165 if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK, 1166 curthread)) 1167 goto loop; 1168 vhold(vp2); 1169 vgone(vp2); 1170 vdrop(vp2); 1171 vput(vp2); 1172 break; 1173 } 1174 } 1175 if (vp2 != NULL) { 1176 continue; 1177 } 1178 dev_unlock(); 1179 mtx_unlock(&devfs_de_interlock); 1180 break; 1181 } 1182 dev_lock(); 1183 cdp->cdp_inuse--; 1184 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1185 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1186 dev_unlock(); 1187 dev_rel(&cdp->cdp_c); 1188 } else 1189 dev_unlock(); 1190 1191 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1192 return (0); 1193 } 1194 1195 static int 1196 devfs_rioctl(struct vop_ioctl_args *ap) 1197 { 1198 int error; 1199 struct devfs_mount *dmp; 1200 1201 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1202 sx_xlock(&dmp->dm_lock); 1203 DEVFS_DMP_HOLD(dmp); 1204 devfs_populate(dmp); 1205 if (DEVFS_DMP_DROP(dmp)) { 1206 sx_xunlock(&dmp->dm_lock); 1207 devfs_unmount_final(dmp); 1208 return (ENOENT); 1209 } 1210 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1211 sx_xunlock(&dmp->dm_lock); 1212 return (error); 1213 } 1214 1215 static int 1216 devfs_rread(struct vop_read_args *ap) 1217 { 1218 1219 if (ap->a_vp->v_type != VDIR) 1220 return (EINVAL); 1221 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1222 } 1223 1224 static int 1225 devfs_setattr(struct vop_setattr_args *ap) 1226 { 1227 struct devfs_dirent *de; 1228 struct vattr *vap; 1229 struct vnode *vp; 1230 int c, error; 1231 uid_t uid; 1232 gid_t gid; 1233 1234 vap = ap->a_vap; 1235 vp = ap->a_vp; 1236 if ((vap->va_type != VNON) || 1237 (vap->va_nlink != VNOVAL) || 1238 (vap->va_fsid != VNOVAL) || 1239 (vap->va_fileid != VNOVAL) || 1240 (vap->va_blocksize != VNOVAL) || 1241 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1242 (vap->va_rdev != VNOVAL) || 1243 ((int)vap->va_bytes != VNOVAL) || 1244 (vap->va_gen != VNOVAL)) { 1245 return (EINVAL); 1246 } 1247 1248 de = vp->v_data; 1249 if (vp->v_type == VDIR) 1250 de = de->de_dir; 1251 1252 error = c = 0; 1253 if (vap->va_uid == (uid_t)VNOVAL) 1254 uid = de->de_uid; 1255 else 1256 uid = vap->va_uid; 1257 if (vap->va_gid == (gid_t)VNOVAL) 1258 gid = de->de_gid; 1259 else 1260 gid = vap->va_gid; 1261 if (uid != de->de_uid || gid != de->de_gid) { 1262 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1263 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1264 error = priv_check(ap->a_td, PRIV_VFS_CHOWN); 1265 if (error) 1266 return (error); 1267 } 1268 de->de_uid = uid; 1269 de->de_gid = gid; 1270 c = 1; 1271 } 1272 1273 if (vap->va_mode != (mode_t)VNOVAL) { 1274 if (ap->a_cred->cr_uid != de->de_uid) { 1275 error = priv_check(ap->a_td, PRIV_VFS_ADMIN); 1276 if (error) 1277 return (error); 1278 } 1279 de->de_mode = vap->va_mode; 1280 c = 1; 1281 } 1282 1283 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1284 /* See the comment in ufs_vnops::ufs_setattr(). */ 1285 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) && 1286 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1287 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td)))) 1288 return (error); 1289 if (vap->va_atime.tv_sec != VNOVAL) { 1290 if (vp->v_type == VCHR) 1291 vp->v_rdev->si_atime = vap->va_atime; 1292 else 1293 de->de_atime = vap->va_atime; 1294 } 1295 if (vap->va_mtime.tv_sec != VNOVAL) { 1296 if (vp->v_type == VCHR) 1297 vp->v_rdev->si_mtime = vap->va_mtime; 1298 else 1299 de->de_mtime = vap->va_mtime; 1300 } 1301 c = 1; 1302 } 1303 1304 if (c) { 1305 if (vp->v_type == VCHR) 1306 vfs_timestamp(&vp->v_rdev->si_ctime); 1307 else 1308 vfs_timestamp(&de->de_mtime); 1309 } 1310 return (0); 1311 } 1312 1313 #ifdef MAC 1314 static int 1315 devfs_setlabel(struct vop_setlabel_args *ap) 1316 { 1317 struct vnode *vp; 1318 struct devfs_dirent *de; 1319 1320 vp = ap->a_vp; 1321 de = vp->v_data; 1322 1323 mac_vnode_relabel(ap->a_cred, vp, ap->a_label); 1324 mac_devfs_update(vp->v_mount, de, vp); 1325 1326 return (0); 1327 } 1328 #endif 1329 1330 static int 1331 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) 1332 { 1333 1334 return (vnops.fo_stat(fp, sb, cred, td)); 1335 } 1336 1337 static int 1338 devfs_symlink(struct vop_symlink_args *ap) 1339 { 1340 int i, error; 1341 struct devfs_dirent *dd; 1342 struct devfs_dirent *de; 1343 struct devfs_mount *dmp; 1344 struct thread *td; 1345 1346 td = ap->a_cnp->cn_thread; 1347 KASSERT(td == curthread, ("devfs_symlink: td != curthread")); 1348 1349 error = priv_check(td, PRIV_DEVFS_SYMLINK); 1350 if (error) 1351 return(error); 1352 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1353 dd = ap->a_dvp->v_data; 1354 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1355 de->de_uid = 0; 1356 de->de_gid = 0; 1357 de->de_mode = 0755; 1358 de->de_inode = alloc_unr(devfs_inos); 1359 de->de_dirent->d_type = DT_LNK; 1360 i = strlen(ap->a_target) + 1; 1361 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1362 bcopy(ap->a_target, de->de_symlink, i); 1363 sx_xlock(&dmp->dm_lock); 1364 #ifdef MAC 1365 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1366 #endif 1367 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 1368 return (devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, td)); 1369 } 1370 1371 static int 1372 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) 1373 { 1374 1375 return (vnops.fo_truncate(fp, length, cred, td)); 1376 } 1377 1378 /* ARGSUSED */ 1379 static int 1380 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 1381 { 1382 struct cdev *dev; 1383 int error, ioflag, resid; 1384 struct cdevsw *dsw; 1385 1386 error = devfs_fp_check(fp, &dev, &dsw); 1387 if (error) 1388 return (error); 1389 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1390 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1391 if (ioflag & O_DIRECT) 1392 ioflag |= IO_DIRECT; 1393 if ((flags & FOF_OFFSET) == 0) 1394 uio->uio_offset = fp->f_offset; 1395 1396 resid = uio->uio_resid; 1397 1398 error = dsw->d_write(dev, uio, ioflag); 1399 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1400 vfs_timestamp(&dev->si_ctime); 1401 dev->si_mtime = dev->si_ctime; 1402 } 1403 curthread->td_fpop = NULL; 1404 dev_relthread(dev); 1405 1406 if ((flags & FOF_OFFSET) == 0) 1407 fp->f_offset = uio->uio_offset; 1408 fp->f_nextoff = uio->uio_offset; 1409 return (error); 1410 } 1411 1412 dev_t 1413 dev2udev(struct cdev *x) 1414 { 1415 if (x == NULL) 1416 return (NODEV); 1417 return (cdev2priv(x)->cdp_inode); 1418 } 1419 1420 static struct fileops devfs_ops_f = { 1421 .fo_read = devfs_read_f, 1422 .fo_write = devfs_write_f, 1423 .fo_truncate = devfs_truncate_f, 1424 .fo_ioctl = devfs_ioctl_f, 1425 .fo_poll = devfs_poll_f, 1426 .fo_kqfilter = devfs_kqfilter_f, 1427 .fo_stat = devfs_stat_f, 1428 .fo_close = devfs_close_f, 1429 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 1430 }; 1431 1432 static struct vop_vector devfs_vnodeops = { 1433 .vop_default = &default_vnodeops, 1434 1435 .vop_access = devfs_access, 1436 .vop_getattr = devfs_getattr, 1437 .vop_ioctl = devfs_rioctl, 1438 .vop_lookup = devfs_lookup, 1439 .vop_mknod = devfs_mknod, 1440 .vop_pathconf = devfs_pathconf, 1441 .vop_read = devfs_rread, 1442 .vop_readdir = devfs_readdir, 1443 .vop_readlink = devfs_readlink, 1444 .vop_reclaim = devfs_reclaim, 1445 .vop_remove = devfs_remove, 1446 .vop_revoke = devfs_revoke, 1447 .vop_setattr = devfs_setattr, 1448 #ifdef MAC 1449 .vop_setlabel = devfs_setlabel, 1450 #endif 1451 .vop_symlink = devfs_symlink, 1452 }; 1453 1454 static struct vop_vector devfs_specops = { 1455 .vop_default = &default_vnodeops, 1456 1457 .vop_access = devfs_access, 1458 .vop_advlock = devfs_advlock, 1459 .vop_bmap = VOP_PANIC, 1460 .vop_close = devfs_close, 1461 .vop_create = VOP_PANIC, 1462 .vop_fsync = devfs_fsync, 1463 .vop_getattr = devfs_getattr, 1464 .vop_lease = VOP_NULL, 1465 .vop_link = VOP_PANIC, 1466 .vop_mkdir = VOP_PANIC, 1467 .vop_mknod = VOP_PANIC, 1468 .vop_open = devfs_open, 1469 .vop_pathconf = devfs_pathconf, 1470 .vop_print = devfs_print, 1471 .vop_read = VOP_PANIC, 1472 .vop_readdir = VOP_PANIC, 1473 .vop_readlink = VOP_PANIC, 1474 .vop_reallocblks = VOP_PANIC, 1475 .vop_reclaim = devfs_reclaim, 1476 .vop_remove = devfs_remove, 1477 .vop_rename = VOP_PANIC, 1478 .vop_revoke = devfs_revoke, 1479 .vop_rmdir = VOP_PANIC, 1480 .vop_setattr = devfs_setattr, 1481 #ifdef MAC 1482 .vop_setlabel = devfs_setlabel, 1483 #endif 1484 .vop_strategy = VOP_PANIC, 1485 .vop_symlink = VOP_PANIC, 1486 .vop_write = VOP_PANIC, 1487 }; 1488 1489 /* 1490 * Our calling convention to the device drivers used to be that we passed 1491 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 1492 * flags instead since that's what open(), close() and ioctl() takes and 1493 * we don't really want vnode.h in device drivers. 1494 * We solved the source compatibility by redefining some vnode flags to 1495 * be the same as the fcntl ones and by sending down the bitwise OR of 1496 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 1497 * pulls the rug out under this. 1498 */ 1499 CTASSERT(O_NONBLOCK == IO_NDELAY); 1500 CTASSERT(O_FSYNC == IO_SYNC); 1501