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 * mkdir: want it ? 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/conf.h> 45 #include <sys/dirent.h> 46 #include <sys/fcntl.h> 47 #include <sys/file.h> 48 #include <sys/filedesc.h> 49 #include <sys/filio.h> 50 #include <sys/jail.h> 51 #include <sys/kernel.h> 52 #include <sys/lock.h> 53 #include <sys/malloc.h> 54 #include <sys/mount.h> 55 #include <sys/namei.h> 56 #include <sys/priv.h> 57 #include <sys/proc.h> 58 #include <sys/stat.h> 59 #include <sys/sx.h> 60 #include <sys/time.h> 61 #include <sys/ttycom.h> 62 #include <sys/unistd.h> 63 #include <sys/vnode.h> 64 65 static struct vop_vector devfs_vnodeops; 66 static struct fileops devfs_ops_f; 67 68 #include <fs/devfs/devfs.h> 69 #include <fs/devfs/devfs_int.h> 70 71 #include <security/mac/mac_framework.h> 72 73 static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data"); 74 75 struct mtx devfs_de_interlock; 76 MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF); 77 struct sx clone_drain_lock; 78 SX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock"); 79 struct mtx cdevpriv_mtx; 80 MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF); 81 82 static int 83 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp, 84 int *ref) 85 { 86 87 *dswp = devvn_refthread(fp->f_vnode, devp, ref); 88 if (*devp != fp->f_data) { 89 if (*dswp != NULL) 90 dev_relthread(*devp, *ref); 91 return (ENXIO); 92 } 93 KASSERT((*devp)->si_refcount > 0, 94 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp))); 95 if (*dswp == NULL) 96 return (ENXIO); 97 curthread->td_fpop = fp; 98 return (0); 99 } 100 101 int 102 devfs_get_cdevpriv(void **datap) 103 { 104 struct file *fp; 105 struct cdev_privdata *p; 106 int error; 107 108 fp = curthread->td_fpop; 109 if (fp == NULL) 110 return (EBADF); 111 p = fp->f_cdevpriv; 112 if (p != NULL) { 113 error = 0; 114 *datap = p->cdpd_data; 115 } else 116 error = ENOENT; 117 return (error); 118 } 119 120 int 121 devfs_set_cdevpriv(void *priv, cdevpriv_dtr_t priv_dtr) 122 { 123 struct file *fp; 124 struct cdev_priv *cdp; 125 struct cdev_privdata *p; 126 int error; 127 128 fp = curthread->td_fpop; 129 if (fp == NULL) 130 return (ENOENT); 131 cdp = cdev2priv((struct cdev *)fp->f_data); 132 p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK); 133 p->cdpd_data = priv; 134 p->cdpd_dtr = priv_dtr; 135 p->cdpd_fp = fp; 136 mtx_lock(&cdevpriv_mtx); 137 if (fp->f_cdevpriv == NULL) { 138 LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list); 139 fp->f_cdevpriv = p; 140 mtx_unlock(&cdevpriv_mtx); 141 error = 0; 142 } else { 143 mtx_unlock(&cdevpriv_mtx); 144 free(p, M_CDEVPDATA); 145 error = EBUSY; 146 } 147 return (error); 148 } 149 150 void 151 devfs_destroy_cdevpriv(struct cdev_privdata *p) 152 { 153 154 mtx_assert(&cdevpriv_mtx, MA_OWNED); 155 p->cdpd_fp->f_cdevpriv = NULL; 156 LIST_REMOVE(p, cdpd_list); 157 mtx_unlock(&cdevpriv_mtx); 158 (p->cdpd_dtr)(p->cdpd_data); 159 free(p, M_CDEVPDATA); 160 } 161 162 void 163 devfs_fpdrop(struct file *fp) 164 { 165 struct cdev_privdata *p; 166 167 mtx_lock(&cdevpriv_mtx); 168 if ((p = fp->f_cdevpriv) == NULL) { 169 mtx_unlock(&cdevpriv_mtx); 170 return; 171 } 172 devfs_destroy_cdevpriv(p); 173 } 174 175 void 176 devfs_clear_cdevpriv(void) 177 { 178 struct file *fp; 179 180 fp = curthread->td_fpop; 181 if (fp == NULL) 182 return; 183 devfs_fpdrop(fp); 184 } 185 186 /* 187 * On success devfs_populate_vp() returns with dmp->dm_lock held. 188 */ 189 static int 190 devfs_populate_vp(struct vnode *vp) 191 { 192 struct devfs_dirent *de; 193 struct devfs_mount *dmp; 194 int locked; 195 196 ASSERT_VOP_LOCKED(vp, "devfs_populate_vp"); 197 198 dmp = VFSTODEVFS(vp->v_mount); 199 locked = VOP_ISLOCKED(vp); 200 201 sx_xlock(&dmp->dm_lock); 202 DEVFS_DMP_HOLD(dmp); 203 204 /* Can't call devfs_populate() with the vnode lock held. */ 205 VOP_UNLOCK(vp, 0); 206 devfs_populate(dmp); 207 208 sx_xunlock(&dmp->dm_lock); 209 vn_lock(vp, locked | LK_RETRY); 210 sx_xlock(&dmp->dm_lock); 211 if (DEVFS_DMP_DROP(dmp)) { 212 sx_xunlock(&dmp->dm_lock); 213 devfs_unmount_final(dmp); 214 return (EBADF); 215 } 216 if ((vp->v_iflag & VI_DOOMED) != 0) { 217 sx_xunlock(&dmp->dm_lock); 218 return (EBADF); 219 } 220 de = vp->v_data; 221 KASSERT(de != NULL, 222 ("devfs_populate_vp: vp->v_data == NULL but vnode not doomed")); 223 if ((de->de_flags & DE_DOOMED) != 0) { 224 sx_xunlock(&dmp->dm_lock); 225 return (EBADF); 226 } 227 228 return (0); 229 } 230 231 static int 232 devfs_vptocnp(struct vop_vptocnp_args *ap) 233 { 234 struct vnode *vp = ap->a_vp; 235 struct vnode **dvp = ap->a_vpp; 236 struct devfs_mount *dmp; 237 char *buf = ap->a_buf; 238 int *buflen = ap->a_buflen; 239 struct devfs_dirent *dd, *de; 240 int i, error; 241 242 dmp = VFSTODEVFS(vp->v_mount); 243 244 error = devfs_populate_vp(vp); 245 if (error != 0) 246 return (error); 247 248 i = *buflen; 249 dd = vp->v_data; 250 251 if (vp->v_type == VCHR) { 252 i -= strlen(dd->de_cdp->cdp_c.si_name); 253 if (i < 0) { 254 error = ENOMEM; 255 goto finished; 256 } 257 bcopy(dd->de_cdp->cdp_c.si_name, buf + i, 258 strlen(dd->de_cdp->cdp_c.si_name)); 259 de = dd->de_dir; 260 } else if (vp->v_type == VDIR) { 261 if (dd == dmp->dm_rootdir) { 262 *dvp = vp; 263 vref(*dvp); 264 goto finished; 265 } 266 i -= dd->de_dirent->d_namlen; 267 if (i < 0) { 268 error = ENOMEM; 269 goto finished; 270 } 271 bcopy(dd->de_dirent->d_name, buf + i, 272 dd->de_dirent->d_namlen); 273 de = dd; 274 } else { 275 error = ENOENT; 276 goto finished; 277 } 278 *buflen = i; 279 de = devfs_parent_dirent(de); 280 if (de == NULL) { 281 error = ENOENT; 282 goto finished; 283 } 284 mtx_lock(&devfs_de_interlock); 285 *dvp = de->de_vnode; 286 if (*dvp != NULL) { 287 VI_LOCK(*dvp); 288 mtx_unlock(&devfs_de_interlock); 289 vholdl(*dvp); 290 VI_UNLOCK(*dvp); 291 vref(*dvp); 292 vdrop(*dvp); 293 } else { 294 mtx_unlock(&devfs_de_interlock); 295 error = ENOENT; 296 } 297 finished: 298 sx_xunlock(&dmp->dm_lock); 299 return (error); 300 } 301 302 /* 303 * Construct the fully qualified path name relative to the mountpoint. 304 * If a NULL cnp is provided, no '/' is appended to the resulting path. 305 */ 306 char * 307 devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd, 308 struct componentname *cnp) 309 { 310 int i; 311 struct devfs_dirent *de; 312 313 sx_assert(&dmp->dm_lock, SA_LOCKED); 314 315 i = SPECNAMELEN; 316 buf[i] = '\0'; 317 if (cnp != NULL) 318 i -= cnp->cn_namelen; 319 if (i < 0) 320 return (NULL); 321 if (cnp != NULL) 322 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); 323 de = dd; 324 while (de != dmp->dm_rootdir) { 325 if (cnp != NULL || i < SPECNAMELEN) { 326 i--; 327 if (i < 0) 328 return (NULL); 329 buf[i] = '/'; 330 } 331 i -= de->de_dirent->d_namlen; 332 if (i < 0) 333 return (NULL); 334 bcopy(de->de_dirent->d_name, buf + i, 335 de->de_dirent->d_namlen); 336 de = devfs_parent_dirent(de); 337 if (de == NULL) 338 return (NULL); 339 } 340 return (buf + i); 341 } 342 343 static int 344 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp, 345 struct devfs_dirent *de) 346 { 347 int not_found; 348 349 not_found = 0; 350 if (de->de_flags & DE_DOOMED) 351 not_found = 1; 352 if (DEVFS_DE_DROP(de)) { 353 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed")); 354 devfs_dirent_free(de); 355 } 356 if (DEVFS_DMP_DROP(dmp)) { 357 KASSERT(not_found == 1, 358 ("DEVFS mount struct freed before dirent")); 359 not_found = 2; 360 sx_xunlock(&dmp->dm_lock); 361 devfs_unmount_final(dmp); 362 } 363 if (not_found == 1 || (drop_dm_lock && not_found != 2)) 364 sx_unlock(&dmp->dm_lock); 365 return (not_found); 366 } 367 368 static void 369 devfs_insmntque_dtr(struct vnode *vp, void *arg) 370 { 371 struct devfs_dirent *de; 372 373 de = (struct devfs_dirent *)arg; 374 mtx_lock(&devfs_de_interlock); 375 vp->v_data = NULL; 376 de->de_vnode = NULL; 377 mtx_unlock(&devfs_de_interlock); 378 vgone(vp); 379 vput(vp); 380 } 381 382 /* 383 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops 384 * it on return. 385 */ 386 int 387 devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode, 388 struct vnode **vpp) 389 { 390 int error; 391 struct vnode *vp; 392 struct cdev *dev; 393 struct devfs_mount *dmp; 394 struct cdevsw *dsw; 395 396 dmp = VFSTODEVFS(mp); 397 if (de->de_flags & DE_DOOMED) { 398 sx_xunlock(&dmp->dm_lock); 399 return (ENOENT); 400 } 401 loop: 402 DEVFS_DE_HOLD(de); 403 DEVFS_DMP_HOLD(dmp); 404 mtx_lock(&devfs_de_interlock); 405 vp = de->de_vnode; 406 if (vp != NULL) { 407 VI_LOCK(vp); 408 mtx_unlock(&devfs_de_interlock); 409 sx_xunlock(&dmp->dm_lock); 410 vget(vp, lockmode | LK_INTERLOCK | LK_RETRY, curthread); 411 sx_xlock(&dmp->dm_lock); 412 if (devfs_allocv_drop_refs(0, dmp, de)) { 413 vput(vp); 414 return (ENOENT); 415 } 416 else if ((vp->v_iflag & VI_DOOMED) != 0) { 417 mtx_lock(&devfs_de_interlock); 418 if (de->de_vnode == vp) { 419 de->de_vnode = NULL; 420 vp->v_data = NULL; 421 } 422 mtx_unlock(&devfs_de_interlock); 423 vput(vp); 424 goto loop; 425 } 426 sx_xunlock(&dmp->dm_lock); 427 *vpp = vp; 428 return (0); 429 } 430 mtx_unlock(&devfs_de_interlock); 431 if (de->de_dirent->d_type == DT_CHR) { 432 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { 433 devfs_allocv_drop_refs(1, dmp, de); 434 return (ENOENT); 435 } 436 dev = &de->de_cdp->cdp_c; 437 } else { 438 dev = NULL; 439 } 440 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 441 if (error != 0) { 442 devfs_allocv_drop_refs(1, dmp, de); 443 printf("devfs_allocv: failed to allocate new vnode\n"); 444 return (error); 445 } 446 447 if (de->de_dirent->d_type == DT_CHR) { 448 vp->v_type = VCHR; 449 VI_LOCK(vp); 450 dev_lock(); 451 dev_refl(dev); 452 /* XXX: v_rdev should be protect by vnode lock */ 453 vp->v_rdev = dev; 454 KASSERT(vp->v_usecount == 1, 455 ("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount)); 456 dev->si_usecount += vp->v_usecount; 457 /* Special casing of ttys for deadfs. Probably redundant. */ 458 dsw = dev->si_devsw; 459 if (dsw != NULL && (dsw->d_flags & D_TTY) != 0) 460 vp->v_vflag |= VV_ISTTY; 461 dev_unlock(); 462 VI_UNLOCK(vp); 463 if ((dev->si_flags & SI_ETERNAL) != 0) 464 vp->v_vflag |= VV_ETERNALDEV; 465 vp->v_op = &devfs_specops; 466 } else if (de->de_dirent->d_type == DT_DIR) { 467 vp->v_type = VDIR; 468 } else if (de->de_dirent->d_type == DT_LNK) { 469 vp->v_type = VLNK; 470 } else { 471 vp->v_type = VBAD; 472 } 473 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS); 474 VN_LOCK_ASHARE(vp); 475 mtx_lock(&devfs_de_interlock); 476 vp->v_data = de; 477 de->de_vnode = vp; 478 mtx_unlock(&devfs_de_interlock); 479 error = insmntque1(vp, mp, devfs_insmntque_dtr, de); 480 if (error != 0) { 481 (void) devfs_allocv_drop_refs(1, dmp, de); 482 return (error); 483 } 484 if (devfs_allocv_drop_refs(0, dmp, de)) { 485 vput(vp); 486 return (ENOENT); 487 } 488 #ifdef MAC 489 mac_devfs_vnode_associate(mp, de, vp); 490 #endif 491 sx_xunlock(&dmp->dm_lock); 492 *vpp = vp; 493 return (0); 494 } 495 496 static int 497 devfs_access(struct vop_access_args *ap) 498 { 499 struct vnode *vp = ap->a_vp; 500 struct devfs_dirent *de; 501 struct proc *p; 502 int error; 503 504 de = vp->v_data; 505 if (vp->v_type == VDIR) 506 de = de->de_dir; 507 508 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 509 ap->a_accmode, ap->a_cred, NULL); 510 if (error == 0) 511 return (0); 512 if (error != EACCES) 513 return (error); 514 p = ap->a_td->td_proc; 515 /* We do, however, allow access to the controlling terminal */ 516 PROC_LOCK(p); 517 if (!(p->p_flag & P_CONTROLT)) { 518 PROC_UNLOCK(p); 519 return (error); 520 } 521 if (p->p_session->s_ttydp == de->de_cdp) 522 error = 0; 523 PROC_UNLOCK(p); 524 return (error); 525 } 526 527 /* ARGSUSED */ 528 static int 529 devfs_close(struct vop_close_args *ap) 530 { 531 struct vnode *vp = ap->a_vp, *oldvp; 532 struct thread *td = ap->a_td; 533 struct proc *p; 534 struct cdev *dev = vp->v_rdev; 535 struct cdevsw *dsw; 536 int vp_locked, error, ref; 537 538 /* 539 * XXX: Don't call d_close() if we were called because of 540 * XXX: insmntque1() failure. 541 */ 542 if (vp->v_data == NULL) 543 return (0); 544 545 /* 546 * Hack: a tty device that is a controlling terminal 547 * has a reference from the session structure. 548 * We cannot easily tell that a character device is 549 * a controlling terminal, unless it is the closing 550 * process' controlling terminal. In that case, 551 * if the reference count is 2 (this last descriptor 552 * plus the session), release the reference from the session. 553 */ 554 if (td != NULL) { 555 p = td->td_proc; 556 PROC_LOCK(p); 557 if (vp == p->p_session->s_ttyvp) { 558 PROC_UNLOCK(p); 559 oldvp = NULL; 560 sx_xlock(&proctree_lock); 561 if (vp == p->p_session->s_ttyvp) { 562 SESS_LOCK(p->p_session); 563 VI_LOCK(vp); 564 if (count_dev(dev) == 2 && 565 (vp->v_iflag & VI_DOOMED) == 0) { 566 p->p_session->s_ttyvp = NULL; 567 p->p_session->s_ttydp = NULL; 568 oldvp = vp; 569 } 570 VI_UNLOCK(vp); 571 SESS_UNLOCK(p->p_session); 572 } 573 sx_xunlock(&proctree_lock); 574 if (oldvp != NULL) 575 vrele(oldvp); 576 } else 577 PROC_UNLOCK(p); 578 } 579 /* 580 * We do not want to really close the device if it 581 * is still in use unless we are trying to close it 582 * forcibly. Since every use (buffer, vnode, swap, cmap) 583 * holds a reference to the vnode, and because we mark 584 * any other vnodes that alias this device, when the 585 * sum of the reference counts on all the aliased 586 * vnodes descends to one, we are on last close. 587 */ 588 dsw = dev_refthread(dev, &ref); 589 if (dsw == NULL) 590 return (ENXIO); 591 VI_LOCK(vp); 592 if (vp->v_iflag & VI_DOOMED) { 593 /* Forced close. */ 594 } else if (dsw->d_flags & D_TRACKCLOSE) { 595 /* Keep device updated on status. */ 596 } else if (count_dev(dev) > 1) { 597 VI_UNLOCK(vp); 598 dev_relthread(dev, ref); 599 return (0); 600 } 601 vholdl(vp); 602 VI_UNLOCK(vp); 603 vp_locked = VOP_ISLOCKED(vp); 604 VOP_UNLOCK(vp, 0); 605 KASSERT(dev->si_refcount > 0, 606 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 607 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 608 dev_relthread(dev, ref); 609 vn_lock(vp, vp_locked | LK_RETRY); 610 vdrop(vp); 611 return (error); 612 } 613 614 static int 615 devfs_close_f(struct file *fp, struct thread *td) 616 { 617 int error; 618 struct file *fpop; 619 620 /* 621 * NB: td may be NULL if this descriptor is closed due to 622 * garbage collection from a closed UNIX domain socket. 623 */ 624 fpop = curthread->td_fpop; 625 curthread->td_fpop = fp; 626 error = vnops.fo_close(fp, td); 627 curthread->td_fpop = fpop; 628 629 /* 630 * The f_cdevpriv cannot be assigned non-NULL value while we 631 * are destroying the file. 632 */ 633 if (fp->f_cdevpriv != NULL) 634 devfs_fpdrop(fp); 635 return (error); 636 } 637 638 static int 639 devfs_fsync(struct vop_fsync_args *ap) 640 { 641 int error; 642 struct bufobj *bo; 643 struct devfs_dirent *de; 644 645 if (!vn_isdisk(ap->a_vp, &error)) { 646 bo = &ap->a_vp->v_bufobj; 647 de = ap->a_vp->v_data; 648 if (error == ENXIO && bo->bo_dirty.bv_cnt > 0) { 649 printf("Device %s went missing before all of the data " 650 "could be written to it; expect data loss.\n", 651 de->de_dirent->d_name); 652 653 error = vop_stdfsync(ap); 654 if (bo->bo_dirty.bv_cnt != 0 || error != 0) 655 panic("devfs_fsync: vop_stdfsync failed."); 656 } 657 658 return (0); 659 } 660 661 return (vop_stdfsync(ap)); 662 } 663 664 static int 665 devfs_getattr(struct vop_getattr_args *ap) 666 { 667 struct vnode *vp = ap->a_vp; 668 struct vattr *vap = ap->a_vap; 669 int error; 670 struct devfs_dirent *de; 671 struct devfs_mount *dmp; 672 struct cdev *dev; 673 674 error = devfs_populate_vp(vp); 675 if (error != 0) 676 return (error); 677 678 dmp = VFSTODEVFS(vp->v_mount); 679 sx_xunlock(&dmp->dm_lock); 680 681 de = vp->v_data; 682 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 683 if (vp->v_type == VDIR) { 684 de = de->de_dir; 685 KASSERT(de != NULL, 686 ("Null dir dirent in devfs_getattr vp=%p", vp)); 687 } 688 vap->va_uid = de->de_uid; 689 vap->va_gid = de->de_gid; 690 vap->va_mode = de->de_mode; 691 if (vp->v_type == VLNK) 692 vap->va_size = strlen(de->de_symlink); 693 else if (vp->v_type == VDIR) 694 vap->va_size = vap->va_bytes = DEV_BSIZE; 695 else 696 vap->va_size = 0; 697 if (vp->v_type != VDIR) 698 vap->va_bytes = 0; 699 vap->va_blocksize = DEV_BSIZE; 700 vap->va_type = vp->v_type; 701 702 #define fix(aa) \ 703 do { \ 704 if ((aa).tv_sec <= 3600) { \ 705 (aa).tv_sec = boottime.tv_sec; \ 706 (aa).tv_nsec = boottime.tv_usec * 1000; \ 707 } \ 708 } while (0) 709 710 if (vp->v_type != VCHR) { 711 fix(de->de_atime); 712 vap->va_atime = de->de_atime; 713 fix(de->de_mtime); 714 vap->va_mtime = de->de_mtime; 715 fix(de->de_ctime); 716 vap->va_ctime = de->de_ctime; 717 } else { 718 dev = vp->v_rdev; 719 fix(dev->si_atime); 720 vap->va_atime = dev->si_atime; 721 fix(dev->si_mtime); 722 vap->va_mtime = dev->si_mtime; 723 fix(dev->si_ctime); 724 vap->va_ctime = dev->si_ctime; 725 726 vap->va_rdev = cdev2priv(dev)->cdp_inode; 727 } 728 vap->va_gen = 0; 729 vap->va_flags = 0; 730 vap->va_filerev = 0; 731 vap->va_nlink = de->de_links; 732 vap->va_fileid = de->de_inode; 733 734 return (error); 735 } 736 737 /* ARGSUSED */ 738 static int 739 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 740 { 741 struct cdev *dev; 742 struct cdevsw *dsw; 743 struct vnode *vp; 744 struct vnode *vpold; 745 int error, i, ref; 746 const char *p; 747 struct fiodgname_arg *fgn; 748 struct file *fpop; 749 750 fpop = td->td_fpop; 751 error = devfs_fp_check(fp, &dev, &dsw, &ref); 752 if (error != 0) { 753 error = vnops.fo_ioctl(fp, com, data, cred, td); 754 return (error); 755 } 756 757 if (com == FIODTYPE) { 758 *(int *)data = dsw->d_flags & D_TYPEMASK; 759 td->td_fpop = fpop; 760 dev_relthread(dev, ref); 761 return (0); 762 } else if (com == FIODGNAME) { 763 fgn = data; 764 p = devtoname(dev); 765 i = strlen(p) + 1; 766 if (i > fgn->len) 767 error = EINVAL; 768 else 769 error = copyout(p, fgn->buf, i); 770 td->td_fpop = fpop; 771 dev_relthread(dev, ref); 772 return (error); 773 } 774 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td); 775 td->td_fpop = NULL; 776 dev_relthread(dev, ref); 777 if (error == ENOIOCTL) 778 error = ENOTTY; 779 if (error == 0 && com == TIOCSCTTY) { 780 vp = fp->f_vnode; 781 782 /* Do nothing if reassigning same control tty */ 783 sx_slock(&proctree_lock); 784 if (td->td_proc->p_session->s_ttyvp == vp) { 785 sx_sunlock(&proctree_lock); 786 return (0); 787 } 788 789 vpold = td->td_proc->p_session->s_ttyvp; 790 VREF(vp); 791 SESS_LOCK(td->td_proc->p_session); 792 td->td_proc->p_session->s_ttyvp = vp; 793 td->td_proc->p_session->s_ttydp = cdev2priv(dev); 794 SESS_UNLOCK(td->td_proc->p_session); 795 796 sx_sunlock(&proctree_lock); 797 798 /* Get rid of reference to old control tty */ 799 if (vpold) 800 vrele(vpold); 801 } 802 return (error); 803 } 804 805 /* ARGSUSED */ 806 static int 807 devfs_kqfilter_f(struct file *fp, struct knote *kn) 808 { 809 struct cdev *dev; 810 struct cdevsw *dsw; 811 int error, ref; 812 struct file *fpop; 813 struct thread *td; 814 815 td = curthread; 816 fpop = td->td_fpop; 817 error = devfs_fp_check(fp, &dev, &dsw, &ref); 818 if (error) 819 return (error); 820 error = dsw->d_kqfilter(dev, kn); 821 td->td_fpop = fpop; 822 dev_relthread(dev, ref); 823 return (error); 824 } 825 826 static inline int 827 devfs_prison_check(struct devfs_dirent *de, struct thread *td) 828 { 829 struct cdev_priv *cdp; 830 struct ucred *dcr; 831 struct proc *p; 832 int error; 833 834 cdp = de->de_cdp; 835 if (cdp == NULL) 836 return (0); 837 dcr = cdp->cdp_c.si_cred; 838 if (dcr == NULL) 839 return (0); 840 841 error = prison_check(td->td_ucred, dcr); 842 if (error == 0) 843 return (0); 844 /* We do, however, allow access to the controlling terminal */ 845 p = td->td_proc; 846 PROC_LOCK(p); 847 if (!(p->p_flag & P_CONTROLT)) { 848 PROC_UNLOCK(p); 849 return (error); 850 } 851 if (p->p_session->s_ttydp == cdp) 852 error = 0; 853 PROC_UNLOCK(p); 854 return (error); 855 } 856 857 static int 858 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 859 { 860 struct componentname *cnp; 861 struct vnode *dvp, **vpp; 862 struct thread *td; 863 struct devfs_dirent *de, *dd; 864 struct devfs_dirent **dde; 865 struct devfs_mount *dmp; 866 struct cdev *cdev; 867 int error, flags, nameiop, dvplocked; 868 char specname[SPECNAMELEN + 1], *pname; 869 870 cnp = ap->a_cnp; 871 vpp = ap->a_vpp; 872 dvp = ap->a_dvp; 873 pname = cnp->cn_nameptr; 874 td = cnp->cn_thread; 875 flags = cnp->cn_flags; 876 nameiop = cnp->cn_nameiop; 877 dmp = VFSTODEVFS(dvp->v_mount); 878 dd = dvp->v_data; 879 *vpp = NULLVP; 880 881 if ((flags & ISLASTCN) && nameiop == RENAME) 882 return (EOPNOTSUPP); 883 884 if (dvp->v_type != VDIR) 885 return (ENOTDIR); 886 887 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 888 return (EIO); 889 890 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 891 if (error) 892 return (error); 893 894 if (cnp->cn_namelen == 1 && *pname == '.') { 895 if ((flags & ISLASTCN) && nameiop != LOOKUP) 896 return (EINVAL); 897 *vpp = dvp; 898 VREF(dvp); 899 return (0); 900 } 901 902 if (flags & ISDOTDOT) { 903 if ((flags & ISLASTCN) && nameiop != LOOKUP) 904 return (EINVAL); 905 de = devfs_parent_dirent(dd); 906 if (de == NULL) 907 return (ENOENT); 908 dvplocked = VOP_ISLOCKED(dvp); 909 VOP_UNLOCK(dvp, 0); 910 error = devfs_allocv(de, dvp->v_mount, 911 cnp->cn_lkflags & LK_TYPE_MASK, vpp); 912 *dm_unlock = 0; 913 vn_lock(dvp, dvplocked | LK_RETRY); 914 return (error); 915 } 916 917 dd = dvp->v_data; 918 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0); 919 while (de == NULL) { /* While(...) so we can use break */ 920 921 if (nameiop == DELETE) 922 return (ENOENT); 923 924 /* 925 * OK, we didn't have an entry for the name we were asked for 926 * so we try to see if anybody can create it on demand. 927 */ 928 pname = devfs_fqpn(specname, dmp, dd, cnp); 929 if (pname == NULL) 930 break; 931 932 cdev = NULL; 933 DEVFS_DMP_HOLD(dmp); 934 sx_xunlock(&dmp->dm_lock); 935 sx_slock(&clone_drain_lock); 936 EVENTHANDLER_INVOKE(dev_clone, 937 td->td_ucred, pname, strlen(pname), &cdev); 938 sx_sunlock(&clone_drain_lock); 939 940 if (cdev == NULL) 941 sx_xlock(&dmp->dm_lock); 942 else if (devfs_populate_vp(dvp) != 0) { 943 *dm_unlock = 0; 944 sx_xlock(&dmp->dm_lock); 945 if (DEVFS_DMP_DROP(dmp)) { 946 sx_xunlock(&dmp->dm_lock); 947 devfs_unmount_final(dmp); 948 } else 949 sx_xunlock(&dmp->dm_lock); 950 dev_rel(cdev); 951 return (ENOENT); 952 } 953 if (DEVFS_DMP_DROP(dmp)) { 954 *dm_unlock = 0; 955 sx_xunlock(&dmp->dm_lock); 956 devfs_unmount_final(dmp); 957 if (cdev != NULL) 958 dev_rel(cdev); 959 return (ENOENT); 960 } 961 962 if (cdev == NULL) 963 break; 964 965 dev_lock(); 966 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx]; 967 if (dde != NULL && *dde != NULL) 968 de = *dde; 969 dev_unlock(); 970 dev_rel(cdev); 971 break; 972 } 973 974 if (de == NULL || de->de_flags & DE_WHITEOUT) { 975 if ((nameiop == CREATE || nameiop == RENAME) && 976 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 977 cnp->cn_flags |= SAVENAME; 978 return (EJUSTRETURN); 979 } 980 return (ENOENT); 981 } 982 983 if (devfs_prison_check(de, td)) 984 return (ENOENT); 985 986 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 987 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 988 if (error) 989 return (error); 990 if (*vpp == dvp) { 991 VREF(dvp); 992 *vpp = dvp; 993 return (0); 994 } 995 } 996 error = devfs_allocv(de, dvp->v_mount, cnp->cn_lkflags & LK_TYPE_MASK, 997 vpp); 998 *dm_unlock = 0; 999 return (error); 1000 } 1001 1002 static int 1003 devfs_lookup(struct vop_lookup_args *ap) 1004 { 1005 int j; 1006 struct devfs_mount *dmp; 1007 int dm_unlock; 1008 1009 if (devfs_populate_vp(ap->a_dvp) != 0) 1010 return (ENOTDIR); 1011 1012 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1013 dm_unlock = 1; 1014 j = devfs_lookupx(ap, &dm_unlock); 1015 if (dm_unlock == 1) 1016 sx_xunlock(&dmp->dm_lock); 1017 return (j); 1018 } 1019 1020 static int 1021 devfs_mknod(struct vop_mknod_args *ap) 1022 { 1023 struct componentname *cnp; 1024 struct vnode *dvp, **vpp; 1025 struct devfs_dirent *dd, *de; 1026 struct devfs_mount *dmp; 1027 int error; 1028 1029 /* 1030 * The only type of node we should be creating here is a 1031 * character device, for anything else return EOPNOTSUPP. 1032 */ 1033 if (ap->a_vap->va_type != VCHR) 1034 return (EOPNOTSUPP); 1035 dvp = ap->a_dvp; 1036 dmp = VFSTODEVFS(dvp->v_mount); 1037 1038 cnp = ap->a_cnp; 1039 vpp = ap->a_vpp; 1040 dd = dvp->v_data; 1041 1042 error = ENOENT; 1043 sx_xlock(&dmp->dm_lock); 1044 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 1045 if (cnp->cn_namelen != de->de_dirent->d_namlen) 1046 continue; 1047 if (de->de_dirent->d_type == DT_CHR && 1048 (de->de_cdp->cdp_flags & CDP_ACTIVE) == 0) 1049 continue; 1050 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 1051 de->de_dirent->d_namlen) != 0) 1052 continue; 1053 if (de->de_flags & DE_WHITEOUT) 1054 break; 1055 goto notfound; 1056 } 1057 if (de == NULL) 1058 goto notfound; 1059 de->de_flags &= ~DE_WHITEOUT; 1060 error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp); 1061 return (error); 1062 notfound: 1063 sx_xunlock(&dmp->dm_lock); 1064 return (error); 1065 } 1066 1067 /* ARGSUSED */ 1068 static int 1069 devfs_open(struct vop_open_args *ap) 1070 { 1071 struct thread *td = ap->a_td; 1072 struct vnode *vp = ap->a_vp; 1073 struct cdev *dev = vp->v_rdev; 1074 struct file *fp = ap->a_fp; 1075 int error, ref, vlocked; 1076 struct cdevsw *dsw; 1077 struct file *fpop; 1078 struct mtx *mtxp; 1079 1080 if (vp->v_type == VBLK) 1081 return (ENXIO); 1082 1083 if (dev == NULL) 1084 return (ENXIO); 1085 1086 /* Make this field valid before any I/O in d_open. */ 1087 if (dev->si_iosize_max == 0) 1088 dev->si_iosize_max = DFLTPHYS; 1089 1090 dsw = dev_refthread(dev, &ref); 1091 if (dsw == NULL) 1092 return (ENXIO); 1093 if (fp == NULL && dsw->d_fdopen != NULL) { 1094 dev_relthread(dev, ref); 1095 return (ENXIO); 1096 } 1097 1098 vlocked = VOP_ISLOCKED(vp); 1099 VOP_UNLOCK(vp, 0); 1100 1101 fpop = td->td_fpop; 1102 td->td_fpop = fp; 1103 if (fp != NULL) { 1104 fp->f_data = dev; 1105 fp->f_vnode = vp; 1106 } 1107 if (dsw->d_fdopen != NULL) 1108 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 1109 else 1110 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 1111 /* cleanup any cdevpriv upon error */ 1112 if (error != 0) 1113 devfs_clear_cdevpriv(); 1114 td->td_fpop = fpop; 1115 1116 vn_lock(vp, vlocked | LK_RETRY); 1117 dev_relthread(dev, ref); 1118 if (error != 0) { 1119 if (error == ERESTART) 1120 error = EINTR; 1121 return (error); 1122 } 1123 1124 #if 0 /* /dev/console */ 1125 KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp")); 1126 #else 1127 if (fp == NULL) 1128 return (error); 1129 #endif 1130 if (fp->f_ops == &badfileops) 1131 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f); 1132 mtxp = mtx_pool_find(mtxpool_sleep, fp); 1133 1134 /* 1135 * Hint to the dofilewrite() to not force the buffer draining 1136 * on the writer to the file. Most likely, the write would 1137 * not need normal buffers. 1138 */ 1139 mtx_lock(mtxp); 1140 fp->f_vnread_flags |= FDEVFS_VNODE; 1141 mtx_unlock(mtxp); 1142 return (error); 1143 } 1144 1145 static int 1146 devfs_pathconf(struct vop_pathconf_args *ap) 1147 { 1148 1149 switch (ap->a_name) { 1150 case _PC_MAC_PRESENT: 1151 #ifdef MAC 1152 /* 1153 * If MAC is enabled, devfs automatically supports 1154 * trivial non-persistant label storage. 1155 */ 1156 *ap->a_retval = 1; 1157 #else 1158 *ap->a_retval = 0; 1159 #endif 1160 return (0); 1161 default: 1162 return (vop_stdpathconf(ap)); 1163 } 1164 /* NOTREACHED */ 1165 } 1166 1167 /* ARGSUSED */ 1168 static int 1169 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 1170 { 1171 struct cdev *dev; 1172 struct cdevsw *dsw; 1173 int error, ref; 1174 struct file *fpop; 1175 1176 fpop = td->td_fpop; 1177 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1178 if (error != 0) { 1179 error = vnops.fo_poll(fp, events, cred, td); 1180 return (error); 1181 } 1182 error = dsw->d_poll(dev, events, td); 1183 td->td_fpop = fpop; 1184 dev_relthread(dev, ref); 1185 return(error); 1186 } 1187 1188 /* 1189 * Print out the contents of a special device vnode. 1190 */ 1191 static int 1192 devfs_print(struct vop_print_args *ap) 1193 { 1194 1195 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 1196 return (0); 1197 } 1198 1199 static int 1200 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, 1201 int flags, struct thread *td) 1202 { 1203 struct cdev *dev; 1204 int ioflag, error, ref; 1205 ssize_t resid; 1206 struct cdevsw *dsw; 1207 struct file *fpop; 1208 1209 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1210 return (EINVAL); 1211 fpop = td->td_fpop; 1212 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1213 if (error != 0) { 1214 error = vnops.fo_read(fp, uio, cred, flags, td); 1215 return (error); 1216 } 1217 resid = uio->uio_resid; 1218 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 1219 if (ioflag & O_DIRECT) 1220 ioflag |= IO_DIRECT; 1221 1222 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1223 error = dsw->d_read(dev, uio, ioflag); 1224 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 1225 vfs_timestamp(&dev->si_atime); 1226 td->td_fpop = fpop; 1227 dev_relthread(dev, ref); 1228 1229 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF); 1230 return (error); 1231 } 1232 1233 static int 1234 devfs_readdir(struct vop_readdir_args *ap) 1235 { 1236 int error; 1237 struct uio *uio; 1238 struct dirent *dp; 1239 struct devfs_dirent *dd; 1240 struct devfs_dirent *de; 1241 struct devfs_mount *dmp; 1242 off_t off; 1243 int *tmp_ncookies = NULL; 1244 1245 if (ap->a_vp->v_type != VDIR) 1246 return (ENOTDIR); 1247 1248 uio = ap->a_uio; 1249 if (uio->uio_offset < 0) 1250 return (EINVAL); 1251 1252 /* 1253 * XXX: This is a temporary hack to get around this filesystem not 1254 * supporting cookies. We store the location of the ncookies pointer 1255 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 1256 * and set the number of cookies to 0. We then set the pointer to 1257 * NULL so that vfs_read_dirent doesn't try to call realloc() on 1258 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 1259 * pointer to its original location before returning to the caller. 1260 */ 1261 if (ap->a_ncookies != NULL) { 1262 tmp_ncookies = ap->a_ncookies; 1263 *ap->a_ncookies = 0; 1264 ap->a_ncookies = NULL; 1265 } 1266 1267 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1268 if (devfs_populate_vp(ap->a_vp) != 0) { 1269 if (tmp_ncookies != NULL) 1270 ap->a_ncookies = tmp_ncookies; 1271 return (EIO); 1272 } 1273 error = 0; 1274 de = ap->a_vp->v_data; 1275 off = 0; 1276 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 1277 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 1278 if (dd->de_flags & (DE_COVERED | DE_WHITEOUT)) 1279 continue; 1280 if (devfs_prison_check(dd, uio->uio_td)) 1281 continue; 1282 if (dd->de_dirent->d_type == DT_DIR) 1283 de = dd->de_dir; 1284 else 1285 de = dd; 1286 dp = dd->de_dirent; 1287 if (dp->d_reclen > uio->uio_resid) 1288 break; 1289 dp->d_fileno = de->de_inode; 1290 if (off >= uio->uio_offset) { 1291 error = vfs_read_dirent(ap, dp, off); 1292 if (error) 1293 break; 1294 } 1295 off += dp->d_reclen; 1296 } 1297 sx_xunlock(&dmp->dm_lock); 1298 uio->uio_offset = off; 1299 1300 /* 1301 * Restore ap->a_ncookies if it wasn't originally NULL in the first 1302 * place. 1303 */ 1304 if (tmp_ncookies != NULL) 1305 ap->a_ncookies = tmp_ncookies; 1306 1307 return (error); 1308 } 1309 1310 static int 1311 devfs_readlink(struct vop_readlink_args *ap) 1312 { 1313 struct devfs_dirent *de; 1314 1315 de = ap->a_vp->v_data; 1316 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 1317 } 1318 1319 static int 1320 devfs_reclaim(struct vop_reclaim_args *ap) 1321 { 1322 struct vnode *vp = ap->a_vp; 1323 struct devfs_dirent *de; 1324 struct cdev *dev; 1325 1326 mtx_lock(&devfs_de_interlock); 1327 de = vp->v_data; 1328 if (de != NULL) { 1329 de->de_vnode = NULL; 1330 vp->v_data = NULL; 1331 } 1332 mtx_unlock(&devfs_de_interlock); 1333 1334 vnode_destroy_vobject(vp); 1335 1336 VI_LOCK(vp); 1337 dev_lock(); 1338 dev = vp->v_rdev; 1339 vp->v_rdev = NULL; 1340 1341 if (dev == NULL) { 1342 dev_unlock(); 1343 VI_UNLOCK(vp); 1344 return (0); 1345 } 1346 1347 dev->si_usecount -= vp->v_usecount; 1348 dev_unlock(); 1349 VI_UNLOCK(vp); 1350 dev_rel(dev); 1351 return (0); 1352 } 1353 1354 static int 1355 devfs_remove(struct vop_remove_args *ap) 1356 { 1357 struct vnode *dvp = ap->a_dvp; 1358 struct vnode *vp = ap->a_vp; 1359 struct devfs_dirent *dd; 1360 struct devfs_dirent *de, *de_covered; 1361 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1362 1363 ASSERT_VOP_ELOCKED(dvp, "devfs_remove"); 1364 ASSERT_VOP_ELOCKED(vp, "devfs_remove"); 1365 1366 sx_xlock(&dmp->dm_lock); 1367 dd = ap->a_dvp->v_data; 1368 de = vp->v_data; 1369 if (de->de_cdp == NULL) { 1370 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1371 if (de->de_dirent->d_type == DT_LNK) { 1372 de_covered = devfs_find(dd, de->de_dirent->d_name, 1373 de->de_dirent->d_namlen, 0); 1374 if (de_covered != NULL) 1375 de_covered->de_flags &= ~DE_COVERED; 1376 } 1377 /* We need to unlock dvp because devfs_delete() may lock it. */ 1378 VOP_UNLOCK(vp, 0); 1379 if (dvp != vp) 1380 VOP_UNLOCK(dvp, 0); 1381 devfs_delete(dmp, de, 0); 1382 sx_xunlock(&dmp->dm_lock); 1383 if (dvp != vp) 1384 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1385 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1386 } else { 1387 de->de_flags |= DE_WHITEOUT; 1388 sx_xunlock(&dmp->dm_lock); 1389 } 1390 return (0); 1391 } 1392 1393 /* 1394 * Revoke is called on a tty when a terminal session ends. The vnode 1395 * is orphaned by setting v_op to deadfs so we need to let go of it 1396 * as well so that we create a new one next time around. 1397 * 1398 */ 1399 static int 1400 devfs_revoke(struct vop_revoke_args *ap) 1401 { 1402 struct vnode *vp = ap->a_vp, *vp2; 1403 struct cdev *dev; 1404 struct cdev_priv *cdp; 1405 struct devfs_dirent *de; 1406 int i; 1407 1408 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1409 1410 dev = vp->v_rdev; 1411 cdp = cdev2priv(dev); 1412 1413 dev_lock(); 1414 cdp->cdp_inuse++; 1415 dev_unlock(); 1416 1417 vhold(vp); 1418 vgone(vp); 1419 vdrop(vp); 1420 1421 VOP_UNLOCK(vp,0); 1422 loop: 1423 for (;;) { 1424 mtx_lock(&devfs_de_interlock); 1425 dev_lock(); 1426 vp2 = NULL; 1427 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1428 de = cdp->cdp_dirents[i]; 1429 if (de == NULL) 1430 continue; 1431 1432 vp2 = de->de_vnode; 1433 if (vp2 != NULL) { 1434 dev_unlock(); 1435 VI_LOCK(vp2); 1436 mtx_unlock(&devfs_de_interlock); 1437 if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK, 1438 curthread)) 1439 goto loop; 1440 vhold(vp2); 1441 vgone(vp2); 1442 vdrop(vp2); 1443 vput(vp2); 1444 break; 1445 } 1446 } 1447 if (vp2 != NULL) { 1448 continue; 1449 } 1450 dev_unlock(); 1451 mtx_unlock(&devfs_de_interlock); 1452 break; 1453 } 1454 dev_lock(); 1455 cdp->cdp_inuse--; 1456 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1457 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1458 dev_unlock(); 1459 dev_rel(&cdp->cdp_c); 1460 } else 1461 dev_unlock(); 1462 1463 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1464 return (0); 1465 } 1466 1467 static int 1468 devfs_rioctl(struct vop_ioctl_args *ap) 1469 { 1470 struct vnode *vp; 1471 struct devfs_mount *dmp; 1472 int error; 1473 1474 vp = ap->a_vp; 1475 vn_lock(vp, LK_SHARED | LK_RETRY); 1476 if (vp->v_iflag & VI_DOOMED) { 1477 VOP_UNLOCK(vp, 0); 1478 return (EBADF); 1479 } 1480 dmp = VFSTODEVFS(vp->v_mount); 1481 sx_xlock(&dmp->dm_lock); 1482 VOP_UNLOCK(vp, 0); 1483 DEVFS_DMP_HOLD(dmp); 1484 devfs_populate(dmp); 1485 if (DEVFS_DMP_DROP(dmp)) { 1486 sx_xunlock(&dmp->dm_lock); 1487 devfs_unmount_final(dmp); 1488 return (ENOENT); 1489 } 1490 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1491 sx_xunlock(&dmp->dm_lock); 1492 return (error); 1493 } 1494 1495 static int 1496 devfs_rread(struct vop_read_args *ap) 1497 { 1498 1499 if (ap->a_vp->v_type != VDIR) 1500 return (EINVAL); 1501 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1502 } 1503 1504 static int 1505 devfs_setattr(struct vop_setattr_args *ap) 1506 { 1507 struct devfs_dirent *de; 1508 struct vattr *vap; 1509 struct vnode *vp; 1510 struct thread *td; 1511 int c, error; 1512 uid_t uid; 1513 gid_t gid; 1514 1515 vap = ap->a_vap; 1516 vp = ap->a_vp; 1517 td = curthread; 1518 if ((vap->va_type != VNON) || 1519 (vap->va_nlink != VNOVAL) || 1520 (vap->va_fsid != VNOVAL) || 1521 (vap->va_fileid != VNOVAL) || 1522 (vap->va_blocksize != VNOVAL) || 1523 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1524 (vap->va_rdev != VNOVAL) || 1525 ((int)vap->va_bytes != VNOVAL) || 1526 (vap->va_gen != VNOVAL)) { 1527 return (EINVAL); 1528 } 1529 1530 de = vp->v_data; 1531 if (vp->v_type == VDIR) 1532 de = de->de_dir; 1533 1534 error = c = 0; 1535 if (vap->va_uid == (uid_t)VNOVAL) 1536 uid = de->de_uid; 1537 else 1538 uid = vap->va_uid; 1539 if (vap->va_gid == (gid_t)VNOVAL) 1540 gid = de->de_gid; 1541 else 1542 gid = vap->va_gid; 1543 if (uid != de->de_uid || gid != de->de_gid) { 1544 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1545 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1546 error = priv_check(td, PRIV_VFS_CHOWN); 1547 if (error) 1548 return (error); 1549 } 1550 de->de_uid = uid; 1551 de->de_gid = gid; 1552 c = 1; 1553 } 1554 1555 if (vap->va_mode != (mode_t)VNOVAL) { 1556 if (ap->a_cred->cr_uid != de->de_uid) { 1557 error = priv_check(td, PRIV_VFS_ADMIN); 1558 if (error) 1559 return (error); 1560 } 1561 de->de_mode = vap->va_mode; 1562 c = 1; 1563 } 1564 1565 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1566 error = vn_utimes_perm(vp, vap, ap->a_cred, td); 1567 if (error != 0) 1568 return (error); 1569 if (vap->va_atime.tv_sec != VNOVAL) { 1570 if (vp->v_type == VCHR) 1571 vp->v_rdev->si_atime = vap->va_atime; 1572 else 1573 de->de_atime = vap->va_atime; 1574 } 1575 if (vap->va_mtime.tv_sec != VNOVAL) { 1576 if (vp->v_type == VCHR) 1577 vp->v_rdev->si_mtime = vap->va_mtime; 1578 else 1579 de->de_mtime = vap->va_mtime; 1580 } 1581 c = 1; 1582 } 1583 1584 if (c) { 1585 if (vp->v_type == VCHR) 1586 vfs_timestamp(&vp->v_rdev->si_ctime); 1587 else 1588 vfs_timestamp(&de->de_mtime); 1589 } 1590 return (0); 1591 } 1592 1593 #ifdef MAC 1594 static int 1595 devfs_setlabel(struct vop_setlabel_args *ap) 1596 { 1597 struct vnode *vp; 1598 struct devfs_dirent *de; 1599 1600 vp = ap->a_vp; 1601 de = vp->v_data; 1602 1603 mac_vnode_relabel(ap->a_cred, vp, ap->a_label); 1604 mac_devfs_update(vp->v_mount, de, vp); 1605 1606 return (0); 1607 } 1608 #endif 1609 1610 static int 1611 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) 1612 { 1613 1614 return (vnops.fo_stat(fp, sb, cred, td)); 1615 } 1616 1617 static int 1618 devfs_symlink(struct vop_symlink_args *ap) 1619 { 1620 int i, error; 1621 struct devfs_dirent *dd; 1622 struct devfs_dirent *de, *de_covered, *de_dotdot; 1623 struct devfs_mount *dmp; 1624 1625 error = priv_check(curthread, PRIV_DEVFS_SYMLINK); 1626 if (error) 1627 return(error); 1628 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1629 if (devfs_populate_vp(ap->a_dvp) != 0) 1630 return (ENOENT); 1631 1632 dd = ap->a_dvp->v_data; 1633 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1634 de->de_flags = DE_USER; 1635 de->de_uid = 0; 1636 de->de_gid = 0; 1637 de->de_mode = 0755; 1638 de->de_inode = alloc_unr(devfs_inos); 1639 de->de_dir = dd; 1640 de->de_dirent->d_type = DT_LNK; 1641 i = strlen(ap->a_target) + 1; 1642 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1643 bcopy(ap->a_target, de->de_symlink, i); 1644 #ifdef MAC 1645 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1646 #endif 1647 de_covered = devfs_find(dd, de->de_dirent->d_name, 1648 de->de_dirent->d_namlen, 0); 1649 if (de_covered != NULL) { 1650 if ((de_covered->de_flags & DE_USER) != 0) { 1651 devfs_delete(dmp, de, DEVFS_DEL_NORECURSE); 1652 sx_xunlock(&dmp->dm_lock); 1653 return (EEXIST); 1654 } 1655 KASSERT((de_covered->de_flags & DE_COVERED) == 0, 1656 ("devfs_symlink: entry %p already covered", de_covered)); 1657 de_covered->de_flags |= DE_COVERED; 1658 } 1659 1660 de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */ 1661 de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */ 1662 TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list); 1663 devfs_dir_ref_de(dmp, dd); 1664 devfs_rules_apply(dmp, de); 1665 1666 return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp)); 1667 } 1668 1669 static int 1670 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) 1671 { 1672 1673 return (vnops.fo_truncate(fp, length, cred, td)); 1674 } 1675 1676 static int 1677 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, 1678 int flags, struct thread *td) 1679 { 1680 struct cdev *dev; 1681 int error, ioflag, ref; 1682 ssize_t resid; 1683 struct cdevsw *dsw; 1684 struct file *fpop; 1685 1686 if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1687 return (EINVAL); 1688 fpop = td->td_fpop; 1689 error = devfs_fp_check(fp, &dev, &dsw, &ref); 1690 if (error != 0) { 1691 error = vnops.fo_write(fp, uio, cred, flags, td); 1692 return (error); 1693 } 1694 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1695 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1696 if (ioflag & O_DIRECT) 1697 ioflag |= IO_DIRECT; 1698 foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1699 1700 resid = uio->uio_resid; 1701 1702 error = dsw->d_write(dev, uio, ioflag); 1703 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1704 vfs_timestamp(&dev->si_ctime); 1705 dev->si_mtime = dev->si_ctime; 1706 } 1707 td->td_fpop = fpop; 1708 dev_relthread(dev, ref); 1709 1710 foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF); 1711 return (error); 1712 } 1713 1714 dev_t 1715 dev2udev(struct cdev *x) 1716 { 1717 if (x == NULL) 1718 return (NODEV); 1719 return (cdev2priv(x)->cdp_inode); 1720 } 1721 1722 static struct fileops devfs_ops_f = { 1723 .fo_read = devfs_read_f, 1724 .fo_write = devfs_write_f, 1725 .fo_truncate = devfs_truncate_f, 1726 .fo_ioctl = devfs_ioctl_f, 1727 .fo_poll = devfs_poll_f, 1728 .fo_kqfilter = devfs_kqfilter_f, 1729 .fo_stat = devfs_stat_f, 1730 .fo_close = devfs_close_f, 1731 .fo_chmod = vn_chmod, 1732 .fo_chown = vn_chown, 1733 .fo_sendfile = vn_sendfile, 1734 .fo_seek = vn_seek, 1735 .fo_fill_kinfo = vn_fill_kinfo, 1736 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 1737 }; 1738 1739 static struct vop_vector devfs_vnodeops = { 1740 .vop_default = &default_vnodeops, 1741 1742 .vop_access = devfs_access, 1743 .vop_getattr = devfs_getattr, 1744 .vop_ioctl = devfs_rioctl, 1745 .vop_lookup = devfs_lookup, 1746 .vop_mknod = devfs_mknod, 1747 .vop_pathconf = devfs_pathconf, 1748 .vop_read = devfs_rread, 1749 .vop_readdir = devfs_readdir, 1750 .vop_readlink = devfs_readlink, 1751 .vop_reclaim = devfs_reclaim, 1752 .vop_remove = devfs_remove, 1753 .vop_revoke = devfs_revoke, 1754 .vop_setattr = devfs_setattr, 1755 #ifdef MAC 1756 .vop_setlabel = devfs_setlabel, 1757 #endif 1758 .vop_symlink = devfs_symlink, 1759 .vop_vptocnp = devfs_vptocnp, 1760 }; 1761 1762 struct vop_vector devfs_specops = { 1763 .vop_default = &default_vnodeops, 1764 1765 .vop_access = devfs_access, 1766 .vop_bmap = VOP_PANIC, 1767 .vop_close = devfs_close, 1768 .vop_create = VOP_PANIC, 1769 .vop_fsync = devfs_fsync, 1770 .vop_getattr = devfs_getattr, 1771 .vop_link = VOP_PANIC, 1772 .vop_mkdir = VOP_PANIC, 1773 .vop_mknod = VOP_PANIC, 1774 .vop_open = devfs_open, 1775 .vop_pathconf = devfs_pathconf, 1776 .vop_poll = dead_poll, 1777 .vop_print = devfs_print, 1778 .vop_read = dead_read, 1779 .vop_readdir = VOP_PANIC, 1780 .vop_readlink = VOP_PANIC, 1781 .vop_reallocblks = VOP_PANIC, 1782 .vop_reclaim = devfs_reclaim, 1783 .vop_remove = devfs_remove, 1784 .vop_rename = VOP_PANIC, 1785 .vop_revoke = devfs_revoke, 1786 .vop_rmdir = VOP_PANIC, 1787 .vop_setattr = devfs_setattr, 1788 #ifdef MAC 1789 .vop_setlabel = devfs_setlabel, 1790 #endif 1791 .vop_strategy = VOP_PANIC, 1792 .vop_symlink = VOP_PANIC, 1793 .vop_vptocnp = devfs_vptocnp, 1794 .vop_write = dead_write, 1795 }; 1796 1797 /* 1798 * Our calling convention to the device drivers used to be that we passed 1799 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 1800 * flags instead since that's what open(), close() and ioctl() takes and 1801 * we don't really want vnode.h in device drivers. 1802 * We solved the source compatibility by redefining some vnode flags to 1803 * be the same as the fcntl ones and by sending down the bitwise OR of 1804 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 1805 * pulls the rug out under this. 1806 */ 1807 CTASSERT(O_NONBLOCK == IO_NDELAY); 1808 CTASSERT(O_FSYNC == IO_SYNC); 1809