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