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