1 /*- 2 * Copyright (c) 2000-2004 3 * Poul-Henning Kamp. All rights reserved. 4 * Copyright (c) 1989, 1992-1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95 32 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43 33 * 34 * $FreeBSD$ 35 */ 36 37 /* 38 * TODO: 39 * remove empty directories 40 * mkdir: want it ? 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/conf.h> 46 #include <sys/dirent.h> 47 #include <sys/fcntl.h> 48 #include <sys/file.h> 49 #include <sys/filedesc.h> 50 #include <sys/filio.h> 51 #include <sys/jail.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/malloc.h> 55 #include <sys/mount.h> 56 #include <sys/namei.h> 57 #include <sys/priv.h> 58 #include <sys/proc.h> 59 #include <sys/stat.h> 60 #include <sys/sx.h> 61 #include <sys/time.h> 62 #include <sys/ttycom.h> 63 #include <sys/unistd.h> 64 #include <sys/vnode.h> 65 66 static struct vop_vector devfs_vnodeops; 67 static struct vop_vector devfs_specops; 68 static struct fileops devfs_ops_f; 69 70 #include <fs/devfs/devfs.h> 71 #include <fs/devfs/devfs_int.h> 72 73 #include <security/mac/mac_framework.h> 74 75 static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data"); 76 77 struct mtx devfs_de_interlock; 78 MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF); 79 struct sx clone_drain_lock; 80 SX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock"); 81 struct mtx cdevpriv_mtx; 82 MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF); 83 84 static int 85 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp) 86 { 87 88 *dswp = devvn_refthread(fp->f_vnode, devp); 89 if (*devp != fp->f_data) { 90 if (*dswp != NULL) 91 dev_relthread(*devp); 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 static int 188 devfs_vptocnp(struct vop_vptocnp_args *ap) 189 { 190 struct vnode *vp = ap->a_vp; 191 struct vnode **dvp = ap->a_vpp; 192 struct devfs_mount *dmp; 193 char *buf = ap->a_buf; 194 int *buflen = ap->a_buflen; 195 struct devfs_dirent *dd, *de; 196 int i, error; 197 198 dmp = VFSTODEVFS(vp->v_mount); 199 i = *buflen; 200 dd = vp->v_data; 201 error = 0; 202 203 sx_xlock(&dmp->dm_lock); 204 205 if (vp->v_type == VCHR) { 206 i -= strlen(dd->de_cdp->cdp_c.si_name); 207 if (i < 0) { 208 error = ENOMEM; 209 goto finished; 210 } 211 bcopy(dd->de_cdp->cdp_c.si_name, buf + i, 212 strlen(dd->de_cdp->cdp_c.si_name)); 213 de = dd->de_dir; 214 } else if (vp->v_type == VDIR) { 215 if (dd == dmp->dm_rootdir) { 216 *dvp = vp; 217 vhold(*dvp); 218 goto finished; 219 } 220 i -= dd->de_dirent->d_namlen; 221 if (i < 0) { 222 error = ENOMEM; 223 goto finished; 224 } 225 bcopy(dd->de_dirent->d_name, buf + i, 226 dd->de_dirent->d_namlen); 227 de = dd; 228 } else { 229 error = ENOENT; 230 goto finished; 231 } 232 *buflen = i; 233 de = TAILQ_FIRST(&de->de_dlist); /* "." */ 234 de = TAILQ_NEXT(de, de_list); /* ".." */ 235 de = de->de_dir; 236 mtx_lock(&devfs_de_interlock); 237 *dvp = de->de_vnode; 238 if (*dvp != NULL) { 239 VI_LOCK(*dvp); 240 mtx_unlock(&devfs_de_interlock); 241 vholdl(*dvp); 242 VI_UNLOCK(*dvp); 243 } else { 244 mtx_unlock(&devfs_de_interlock); 245 error = ENOENT; 246 } 247 finished: 248 sx_xunlock(&dmp->dm_lock); 249 return (error); 250 } 251 252 /* 253 * Construct the fully qualified path name relative to the mountpoint 254 */ 255 static char * 256 devfs_fqpn(char *buf, struct vnode *dvp, struct componentname *cnp) 257 { 258 int i; 259 struct devfs_dirent *de, *dd; 260 struct devfs_mount *dmp; 261 262 dmp = VFSTODEVFS(dvp->v_mount); 263 dd = dvp->v_data; 264 i = SPECNAMELEN; 265 buf[i] = '\0'; 266 i -= cnp->cn_namelen; 267 if (i < 0) 268 return (NULL); 269 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); 270 de = dd; 271 while (de != dmp->dm_rootdir) { 272 i--; 273 if (i < 0) 274 return (NULL); 275 buf[i] = '/'; 276 i -= de->de_dirent->d_namlen; 277 if (i < 0) 278 return (NULL); 279 bcopy(de->de_dirent->d_name, buf + i, 280 de->de_dirent->d_namlen); 281 de = TAILQ_FIRST(&de->de_dlist); /* "." */ 282 de = TAILQ_NEXT(de, de_list); /* ".." */ 283 de = de->de_dir; 284 } 285 return (buf + i); 286 } 287 288 static int 289 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp, 290 struct devfs_dirent *de) 291 { 292 int not_found; 293 294 not_found = 0; 295 if (de->de_flags & DE_DOOMED) 296 not_found = 1; 297 if (DEVFS_DE_DROP(de)) { 298 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed")); 299 devfs_dirent_free(de); 300 } 301 if (DEVFS_DMP_DROP(dmp)) { 302 KASSERT(not_found == 1, 303 ("DEVFS mount struct freed before dirent")); 304 not_found = 2; 305 sx_xunlock(&dmp->dm_lock); 306 devfs_unmount_final(dmp); 307 } 308 if (not_found == 1 || (drop_dm_lock && not_found != 2)) 309 sx_unlock(&dmp->dm_lock); 310 return (not_found); 311 } 312 313 static void 314 devfs_insmntque_dtr(struct vnode *vp, void *arg) 315 { 316 struct devfs_dirent *de; 317 318 de = (struct devfs_dirent *)arg; 319 mtx_lock(&devfs_de_interlock); 320 vp->v_data = NULL; 321 de->de_vnode = NULL; 322 mtx_unlock(&devfs_de_interlock); 323 vgone(vp); 324 vput(vp); 325 } 326 327 /* 328 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops 329 * it on return. 330 */ 331 int 332 devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp) 333 { 334 int error; 335 struct vnode *vp; 336 struct cdev *dev; 337 struct devfs_mount *dmp; 338 339 dmp = VFSTODEVFS(mp); 340 if (de->de_flags & DE_DOOMED) { 341 sx_xunlock(&dmp->dm_lock); 342 return (ENOENT); 343 } 344 DEVFS_DE_HOLD(de); 345 DEVFS_DMP_HOLD(dmp); 346 mtx_lock(&devfs_de_interlock); 347 vp = de->de_vnode; 348 if (vp != NULL) { 349 VI_LOCK(vp); 350 mtx_unlock(&devfs_de_interlock); 351 sx_xunlock(&dmp->dm_lock); 352 error = vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, curthread); 353 sx_xlock(&dmp->dm_lock); 354 if (devfs_allocv_drop_refs(0, dmp, de)) { 355 if (error == 0) 356 vput(vp); 357 return (ENOENT); 358 } 359 else if (error) { 360 sx_xunlock(&dmp->dm_lock); 361 return (error); 362 } 363 sx_xunlock(&dmp->dm_lock); 364 *vpp = vp; 365 return (0); 366 } 367 mtx_unlock(&devfs_de_interlock); 368 if (de->de_dirent->d_type == DT_CHR) { 369 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { 370 devfs_allocv_drop_refs(1, dmp, de); 371 return (ENOENT); 372 } 373 dev = &de->de_cdp->cdp_c; 374 } else { 375 dev = NULL; 376 } 377 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 378 if (error != 0) { 379 devfs_allocv_drop_refs(1, dmp, de); 380 printf("devfs_allocv: failed to allocate new vnode\n"); 381 return (error); 382 } 383 384 if (de->de_dirent->d_type == DT_CHR) { 385 vp->v_type = VCHR; 386 VI_LOCK(vp); 387 dev_lock(); 388 dev_refl(dev); 389 /* XXX: v_rdev should be protect by vnode lock */ 390 vp->v_rdev = dev; 391 KASSERT(vp->v_usecount == 1, 392 ("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount)); 393 dev->si_usecount += vp->v_usecount; 394 dev_unlock(); 395 VI_UNLOCK(vp); 396 vp->v_op = &devfs_specops; 397 } else if (de->de_dirent->d_type == DT_DIR) { 398 vp->v_type = VDIR; 399 } else if (de->de_dirent->d_type == DT_LNK) { 400 vp->v_type = VLNK; 401 } else { 402 vp->v_type = VBAD; 403 } 404 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS); 405 mtx_lock(&devfs_de_interlock); 406 vp->v_data = de; 407 de->de_vnode = vp; 408 mtx_unlock(&devfs_de_interlock); 409 error = insmntque1(vp, mp, devfs_insmntque_dtr, de); 410 if (error != 0) { 411 (void) devfs_allocv_drop_refs(1, dmp, de); 412 return (error); 413 } 414 if (devfs_allocv_drop_refs(0, dmp, de)) { 415 vput(vp); 416 return (ENOENT); 417 } 418 #ifdef MAC 419 mac_devfs_vnode_associate(mp, de, vp); 420 #endif 421 sx_xunlock(&dmp->dm_lock); 422 *vpp = vp; 423 return (0); 424 } 425 426 static int 427 devfs_access(struct vop_access_args *ap) 428 { 429 struct vnode *vp = ap->a_vp; 430 struct devfs_dirent *de; 431 int error; 432 433 de = vp->v_data; 434 if (vp->v_type == VDIR) 435 de = de->de_dir; 436 437 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 438 ap->a_accmode, ap->a_cred, NULL); 439 if (!error) 440 return (error); 441 if (error != EACCES) 442 return (error); 443 /* We do, however, allow access to the controlling terminal */ 444 if (!(ap->a_td->td_proc->p_flag & P_CONTROLT)) 445 return (error); 446 if (ap->a_td->td_proc->p_session->s_ttyvp == de->de_vnode) 447 return (0); 448 return (error); 449 } 450 451 /* ARGSUSED */ 452 static int 453 devfs_close(struct vop_close_args *ap) 454 { 455 struct vnode *vp = ap->a_vp, *oldvp; 456 struct thread *td = ap->a_td; 457 struct cdev *dev = vp->v_rdev; 458 struct cdevsw *dsw; 459 int vp_locked, error; 460 461 /* 462 * Hack: a tty device that is a controlling terminal 463 * has a reference from the session structure. 464 * We cannot easily tell that a character device is 465 * a controlling terminal, unless it is the closing 466 * process' controlling terminal. In that case, 467 * if the reference count is 2 (this last descriptor 468 * plus the session), release the reference from the session. 469 */ 470 oldvp = NULL; 471 sx_xlock(&proctree_lock); 472 if (td && vp == td->td_proc->p_session->s_ttyvp) { 473 SESS_LOCK(td->td_proc->p_session); 474 VI_LOCK(vp); 475 if (count_dev(dev) == 2 && (vp->v_iflag & VI_DOOMED) == 0) { 476 td->td_proc->p_session->s_ttyvp = NULL; 477 oldvp = vp; 478 } 479 VI_UNLOCK(vp); 480 SESS_UNLOCK(td->td_proc->p_session); 481 } 482 sx_xunlock(&proctree_lock); 483 if (oldvp != NULL) 484 vrele(oldvp); 485 /* 486 * We do not want to really close the device if it 487 * is still in use unless we are trying to close it 488 * forcibly. Since every use (buffer, vnode, swap, cmap) 489 * holds a reference to the vnode, and because we mark 490 * any other vnodes that alias this device, when the 491 * sum of the reference counts on all the aliased 492 * vnodes descends to one, we are on last close. 493 */ 494 dsw = dev_refthread(dev); 495 if (dsw == NULL) 496 return (ENXIO); 497 VI_LOCK(vp); 498 if (vp->v_iflag & VI_DOOMED) { 499 /* Forced close. */ 500 } else if (dsw->d_flags & D_TRACKCLOSE) { 501 /* Keep device updated on status. */ 502 } else if (count_dev(dev) > 1) { 503 VI_UNLOCK(vp); 504 dev_relthread(dev); 505 return (0); 506 } 507 vholdl(vp); 508 VI_UNLOCK(vp); 509 vp_locked = VOP_ISLOCKED(vp); 510 VOP_UNLOCK(vp, 0); 511 KASSERT(dev->si_refcount > 0, 512 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 513 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 514 dev_relthread(dev); 515 vn_lock(vp, vp_locked | LK_RETRY); 516 vdrop(vp); 517 return (error); 518 } 519 520 static int 521 devfs_close_f(struct file *fp, struct thread *td) 522 { 523 int error; 524 struct file *fpop; 525 526 fpop = td->td_fpop; 527 td->td_fpop = fp; 528 error = vnops.fo_close(fp, td); 529 td->td_fpop = fpop; 530 return (error); 531 } 532 533 static int 534 devfs_fsync(struct vop_fsync_args *ap) 535 { 536 int error; 537 struct bufobj *bo; 538 struct devfs_dirent *de; 539 540 if (!vn_isdisk(ap->a_vp, &error)) { 541 bo = &ap->a_vp->v_bufobj; 542 de = ap->a_vp->v_data; 543 if (error == ENXIO && bo->bo_dirty.bv_cnt > 0) { 544 printf("Device %s went missing before all of the data " 545 "could be written to it; expect data loss.\n", 546 de->de_dirent->d_name); 547 548 error = vop_stdfsync(ap); 549 if (bo->bo_dirty.bv_cnt != 0 || error != 0) 550 panic("devfs_fsync: vop_stdfsync failed."); 551 } 552 553 return (0); 554 } 555 556 return (vop_stdfsync(ap)); 557 } 558 559 static int 560 devfs_getattr(struct vop_getattr_args *ap) 561 { 562 struct vnode *vp = ap->a_vp; 563 struct vattr *vap = ap->a_vap; 564 int error = 0; 565 struct devfs_dirent *de; 566 struct cdev *dev; 567 568 de = vp->v_data; 569 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 570 if (vp->v_type == VDIR) { 571 de = de->de_dir; 572 KASSERT(de != NULL, 573 ("Null dir dirent in devfs_getattr vp=%p", vp)); 574 } 575 vap->va_uid = de->de_uid; 576 vap->va_gid = de->de_gid; 577 vap->va_mode = de->de_mode; 578 if (vp->v_type == VLNK) 579 vap->va_size = strlen(de->de_symlink); 580 else if (vp->v_type == VDIR) 581 vap->va_size = vap->va_bytes = DEV_BSIZE; 582 else 583 vap->va_size = 0; 584 if (vp->v_type != VDIR) 585 vap->va_bytes = 0; 586 vap->va_blocksize = DEV_BSIZE; 587 vap->va_type = vp->v_type; 588 589 #define fix(aa) \ 590 do { \ 591 if ((aa).tv_sec <= 3600) { \ 592 (aa).tv_sec = boottime.tv_sec; \ 593 (aa).tv_nsec = boottime.tv_usec * 1000; \ 594 } \ 595 } while (0) 596 597 if (vp->v_type != VCHR) { 598 fix(de->de_atime); 599 vap->va_atime = de->de_atime; 600 fix(de->de_mtime); 601 vap->va_mtime = de->de_mtime; 602 fix(de->de_ctime); 603 vap->va_ctime = de->de_ctime; 604 } else { 605 dev = vp->v_rdev; 606 fix(dev->si_atime); 607 vap->va_atime = dev->si_atime; 608 fix(dev->si_mtime); 609 vap->va_mtime = dev->si_mtime; 610 fix(dev->si_ctime); 611 vap->va_ctime = dev->si_ctime; 612 613 vap->va_rdev = cdev2priv(dev)->cdp_inode; 614 } 615 vap->va_gen = 0; 616 vap->va_flags = 0; 617 vap->va_filerev = 0; 618 vap->va_nlink = de->de_links; 619 vap->va_fileid = de->de_inode; 620 621 return (error); 622 } 623 624 /* ARGSUSED */ 625 static int 626 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 627 { 628 struct cdev *dev; 629 struct cdevsw *dsw; 630 struct vnode *vp; 631 struct vnode *vpold; 632 int error, i; 633 const char *p; 634 struct fiodgname_arg *fgn; 635 struct file *fpop; 636 637 fpop = td->td_fpop; 638 error = devfs_fp_check(fp, &dev, &dsw); 639 if (error) 640 return (error); 641 642 if (com == FIODTYPE) { 643 *(int *)data = dsw->d_flags & D_TYPEMASK; 644 td->td_fpop = fpop; 645 dev_relthread(dev); 646 return (0); 647 } else if (com == FIODGNAME) { 648 fgn = data; 649 p = devtoname(dev); 650 i = strlen(p) + 1; 651 if (i > fgn->len) 652 error = EINVAL; 653 else 654 error = copyout(p, fgn->buf, i); 655 td->td_fpop = fpop; 656 dev_relthread(dev); 657 return (error); 658 } 659 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td); 660 td->td_fpop = NULL; 661 dev_relthread(dev); 662 if (error == ENOIOCTL) 663 error = ENOTTY; 664 if (error == 0 && com == TIOCSCTTY) { 665 vp = fp->f_vnode; 666 667 /* Do nothing if reassigning same control tty */ 668 sx_slock(&proctree_lock); 669 if (td->td_proc->p_session->s_ttyvp == vp) { 670 sx_sunlock(&proctree_lock); 671 return (0); 672 } 673 674 vpold = td->td_proc->p_session->s_ttyvp; 675 VREF(vp); 676 SESS_LOCK(td->td_proc->p_session); 677 td->td_proc->p_session->s_ttyvp = vp; 678 SESS_UNLOCK(td->td_proc->p_session); 679 680 sx_sunlock(&proctree_lock); 681 682 /* Get rid of reference to old control tty */ 683 if (vpold) 684 vrele(vpold); 685 } 686 return (error); 687 } 688 689 /* ARGSUSED */ 690 static int 691 devfs_kqfilter_f(struct file *fp, struct knote *kn) 692 { 693 struct cdev *dev; 694 struct cdevsw *dsw; 695 int error; 696 struct file *fpop; 697 struct thread *td; 698 699 td = curthread; 700 fpop = td->td_fpop; 701 error = devfs_fp_check(fp, &dev, &dsw); 702 if (error) 703 return (error); 704 error = dsw->d_kqfilter(dev, kn); 705 td->td_fpop = fpop; 706 dev_relthread(dev); 707 return (error); 708 } 709 710 static inline int 711 devfs_prison_check(struct devfs_dirent *de, struct ucred *tcr) 712 { 713 struct cdev_priv *cdp; 714 struct ucred *dcr; 715 716 cdp = de->de_cdp; 717 if (cdp == NULL) 718 return (0); 719 dcr = cdp->cdp_c.si_cred; 720 if (dcr == NULL) 721 return (0); 722 723 return (prison_check(tcr, dcr)); 724 } 725 726 static int 727 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 728 { 729 struct componentname *cnp; 730 struct vnode *dvp, **vpp; 731 struct thread *td; 732 struct devfs_dirent *de, *dd; 733 struct devfs_dirent **dde; 734 struct devfs_mount *dmp; 735 struct cdev *cdev; 736 int error, flags, nameiop; 737 char specname[SPECNAMELEN + 1], *pname; 738 739 cnp = ap->a_cnp; 740 vpp = ap->a_vpp; 741 dvp = ap->a_dvp; 742 pname = cnp->cn_nameptr; 743 td = cnp->cn_thread; 744 flags = cnp->cn_flags; 745 nameiop = cnp->cn_nameiop; 746 dmp = VFSTODEVFS(dvp->v_mount); 747 dd = dvp->v_data; 748 *vpp = NULLVP; 749 750 if ((flags & ISLASTCN) && nameiop == RENAME) 751 return (EOPNOTSUPP); 752 753 if (dvp->v_type != VDIR) 754 return (ENOTDIR); 755 756 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 757 return (EIO); 758 759 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 760 if (error) 761 return (error); 762 763 if (cnp->cn_namelen == 1 && *pname == '.') { 764 if ((flags & ISLASTCN) && nameiop != LOOKUP) 765 return (EINVAL); 766 *vpp = dvp; 767 VREF(dvp); 768 return (0); 769 } 770 771 if (flags & ISDOTDOT) { 772 if ((flags & ISLASTCN) && nameiop != LOOKUP) 773 return (EINVAL); 774 VOP_UNLOCK(dvp, 0); 775 de = TAILQ_FIRST(&dd->de_dlist); /* "." */ 776 de = TAILQ_NEXT(de, de_list); /* ".." */ 777 de = de->de_dir; 778 error = devfs_allocv(de, dvp->v_mount, vpp); 779 *dm_unlock = 0; 780 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 781 return (error); 782 } 783 784 DEVFS_DMP_HOLD(dmp); 785 devfs_populate(dmp); 786 if (DEVFS_DMP_DROP(dmp)) { 787 *dm_unlock = 0; 788 sx_xunlock(&dmp->dm_lock); 789 devfs_unmount_final(dmp); 790 return (ENOENT); 791 } 792 dd = dvp->v_data; 793 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen); 794 while (de == NULL) { /* While(...) so we can use break */ 795 796 if (nameiop == DELETE) 797 return (ENOENT); 798 799 /* 800 * OK, we didn't have an entry for the name we were asked for 801 * so we try to see if anybody can create it on demand. 802 */ 803 pname = devfs_fqpn(specname, dvp, cnp); 804 if (pname == NULL) 805 break; 806 807 cdev = NULL; 808 DEVFS_DMP_HOLD(dmp); 809 sx_xunlock(&dmp->dm_lock); 810 sx_slock(&clone_drain_lock); 811 EVENTHANDLER_INVOKE(dev_clone, 812 td->td_ucred, pname, strlen(pname), &cdev); 813 sx_sunlock(&clone_drain_lock); 814 sx_xlock(&dmp->dm_lock); 815 if (DEVFS_DMP_DROP(dmp)) { 816 *dm_unlock = 0; 817 sx_xunlock(&dmp->dm_lock); 818 devfs_unmount_final(dmp); 819 return (ENOENT); 820 } 821 if (cdev == NULL) 822 break; 823 824 DEVFS_DMP_HOLD(dmp); 825 devfs_populate(dmp); 826 if (DEVFS_DMP_DROP(dmp)) { 827 *dm_unlock = 0; 828 sx_xunlock(&dmp->dm_lock); 829 devfs_unmount_final(dmp); 830 return (ENOENT); 831 } 832 833 dev_lock(); 834 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx]; 835 if (dde != NULL && *dde != NULL) 836 de = *dde; 837 dev_unlock(); 838 dev_rel(cdev); 839 break; 840 } 841 842 if (de == NULL || de->de_flags & DE_WHITEOUT) { 843 if ((nameiop == CREATE || nameiop == RENAME) && 844 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 845 cnp->cn_flags |= SAVENAME; 846 return (EJUSTRETURN); 847 } 848 return (ENOENT); 849 } 850 851 if (devfs_prison_check(de, td->td_ucred)) 852 return (ENOENT); 853 854 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 855 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 856 if (error) 857 return (error); 858 if (*vpp == dvp) { 859 VREF(dvp); 860 *vpp = dvp; 861 return (0); 862 } 863 } 864 error = devfs_allocv(de, dvp->v_mount, vpp); 865 *dm_unlock = 0; 866 return (error); 867 } 868 869 static int 870 devfs_lookup(struct vop_lookup_args *ap) 871 { 872 int j; 873 struct devfs_mount *dmp; 874 int dm_unlock; 875 876 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 877 dm_unlock = 1; 878 sx_xlock(&dmp->dm_lock); 879 j = devfs_lookupx(ap, &dm_unlock); 880 if (dm_unlock == 1) 881 sx_xunlock(&dmp->dm_lock); 882 return (j); 883 } 884 885 static int 886 devfs_mknod(struct vop_mknod_args *ap) 887 { 888 struct componentname *cnp; 889 struct vnode *dvp, **vpp; 890 struct devfs_dirent *dd, *de; 891 struct devfs_mount *dmp; 892 int error; 893 894 /* 895 * The only type of node we should be creating here is a 896 * character device, for anything else return EOPNOTSUPP. 897 */ 898 if (ap->a_vap->va_type != VCHR) 899 return (EOPNOTSUPP); 900 dvp = ap->a_dvp; 901 dmp = VFSTODEVFS(dvp->v_mount); 902 903 cnp = ap->a_cnp; 904 vpp = ap->a_vpp; 905 dd = dvp->v_data; 906 907 error = ENOENT; 908 sx_xlock(&dmp->dm_lock); 909 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 910 if (cnp->cn_namelen != de->de_dirent->d_namlen) 911 continue; 912 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 913 de->de_dirent->d_namlen) != 0) 914 continue; 915 if (de->de_flags & DE_WHITEOUT) 916 break; 917 goto notfound; 918 } 919 if (de == NULL) 920 goto notfound; 921 de->de_flags &= ~DE_WHITEOUT; 922 error = devfs_allocv(de, dvp->v_mount, vpp); 923 return (error); 924 notfound: 925 sx_xunlock(&dmp->dm_lock); 926 return (error); 927 } 928 929 /* ARGSUSED */ 930 static int 931 devfs_open(struct vop_open_args *ap) 932 { 933 struct thread *td = ap->a_td; 934 struct vnode *vp = ap->a_vp; 935 struct cdev *dev = vp->v_rdev; 936 struct file *fp = ap->a_fp; 937 int error; 938 struct cdevsw *dsw; 939 struct file *fpop; 940 941 if (vp->v_type == VBLK) 942 return (ENXIO); 943 944 if (dev == NULL) 945 return (ENXIO); 946 947 /* Make this field valid before any I/O in d_open. */ 948 if (dev->si_iosize_max == 0) 949 dev->si_iosize_max = DFLTPHYS; 950 951 dsw = dev_refthread(dev); 952 if (dsw == NULL) 953 return (ENXIO); 954 955 /* XXX: Special casing of ttys for deadfs. Probably redundant. */ 956 if (dsw->d_flags & D_TTY) 957 vp->v_vflag |= VV_ISTTY; 958 959 VOP_UNLOCK(vp, 0); 960 961 fpop = td->td_fpop; 962 td->td_fpop = fp; 963 if (fp != NULL) { 964 fp->f_data = dev; 965 fp->f_vnode = vp; 966 } 967 if (dsw->d_fdopen != NULL) 968 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 969 else 970 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 971 td->td_fpop = fpop; 972 973 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 974 975 dev_relthread(dev); 976 977 if (error) 978 return (error); 979 980 #if 0 /* /dev/console */ 981 KASSERT(fp != NULL, 982 ("Could not vnode bypass device on NULL fp")); 983 #else 984 if(fp == NULL) 985 return (error); 986 #endif 987 if (fp->f_ops == &badfileops) 988 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f); 989 return (error); 990 } 991 992 static int 993 devfs_pathconf(struct vop_pathconf_args *ap) 994 { 995 996 switch (ap->a_name) { 997 case _PC_MAC_PRESENT: 998 #ifdef MAC 999 /* 1000 * If MAC is enabled, devfs automatically supports 1001 * trivial non-persistant label storage. 1002 */ 1003 *ap->a_retval = 1; 1004 #else 1005 *ap->a_retval = 0; 1006 #endif 1007 return (0); 1008 default: 1009 return (vop_stdpathconf(ap)); 1010 } 1011 /* NOTREACHED */ 1012 } 1013 1014 /* ARGSUSED */ 1015 static int 1016 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 1017 { 1018 struct cdev *dev; 1019 struct cdevsw *dsw; 1020 int error; 1021 struct file *fpop; 1022 1023 fpop = td->td_fpop; 1024 error = devfs_fp_check(fp, &dev, &dsw); 1025 if (error) 1026 return (poll_no_poll(events)); 1027 error = dsw->d_poll(dev, events, td); 1028 td->td_fpop = fpop; 1029 dev_relthread(dev); 1030 return(error); 1031 } 1032 1033 /* 1034 * Print out the contents of a special device vnode. 1035 */ 1036 static int 1037 devfs_print(struct vop_print_args *ap) 1038 { 1039 1040 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 1041 return (0); 1042 } 1043 1044 /* ARGSUSED */ 1045 static int 1046 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 1047 { 1048 struct cdev *dev; 1049 int ioflag, error, resid; 1050 struct cdevsw *dsw; 1051 struct file *fpop; 1052 1053 fpop = td->td_fpop; 1054 error = devfs_fp_check(fp, &dev, &dsw); 1055 if (error) 1056 return (error); 1057 resid = uio->uio_resid; 1058 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 1059 if (ioflag & O_DIRECT) 1060 ioflag |= IO_DIRECT; 1061 1062 if ((flags & FOF_OFFSET) == 0) 1063 uio->uio_offset = fp->f_offset; 1064 1065 error = dsw->d_read(dev, uio, ioflag); 1066 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 1067 vfs_timestamp(&dev->si_atime); 1068 td->td_fpop = fpop; 1069 dev_relthread(dev); 1070 1071 if ((flags & FOF_OFFSET) == 0) 1072 fp->f_offset = uio->uio_offset; 1073 fp->f_nextoff = uio->uio_offset; 1074 return (error); 1075 } 1076 1077 static int 1078 devfs_readdir(struct vop_readdir_args *ap) 1079 { 1080 int error; 1081 struct uio *uio; 1082 struct dirent *dp; 1083 struct devfs_dirent *dd; 1084 struct devfs_dirent *de; 1085 struct devfs_mount *dmp; 1086 off_t off; 1087 int *tmp_ncookies = NULL; 1088 1089 if (ap->a_vp->v_type != VDIR) 1090 return (ENOTDIR); 1091 1092 uio = ap->a_uio; 1093 if (uio->uio_offset < 0) 1094 return (EINVAL); 1095 1096 /* 1097 * XXX: This is a temporary hack to get around this filesystem not 1098 * supporting cookies. We store the location of the ncookies pointer 1099 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 1100 * and set the number of cookies to 0. We then set the pointer to 1101 * NULL so that vfs_read_dirent doesn't try to call realloc() on 1102 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 1103 * pointer to its original location before returning to the caller. 1104 */ 1105 if (ap->a_ncookies != NULL) { 1106 tmp_ncookies = ap->a_ncookies; 1107 *ap->a_ncookies = 0; 1108 ap->a_ncookies = NULL; 1109 } 1110 1111 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1112 sx_xlock(&dmp->dm_lock); 1113 DEVFS_DMP_HOLD(dmp); 1114 devfs_populate(dmp); 1115 if (DEVFS_DMP_DROP(dmp)) { 1116 sx_xunlock(&dmp->dm_lock); 1117 devfs_unmount_final(dmp); 1118 if (tmp_ncookies != NULL) 1119 ap->a_ncookies = tmp_ncookies; 1120 return (EIO); 1121 } 1122 error = 0; 1123 de = ap->a_vp->v_data; 1124 off = 0; 1125 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 1126 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 1127 if (dd->de_flags & DE_WHITEOUT) 1128 continue; 1129 if (devfs_prison_check(dd, ap->a_cred)) 1130 continue; 1131 if (dd->de_dirent->d_type == DT_DIR) 1132 de = dd->de_dir; 1133 else 1134 de = dd; 1135 dp = dd->de_dirent; 1136 if (dp->d_reclen > uio->uio_resid) 1137 break; 1138 dp->d_fileno = de->de_inode; 1139 if (off >= uio->uio_offset) { 1140 error = vfs_read_dirent(ap, dp, off); 1141 if (error) 1142 break; 1143 } 1144 off += dp->d_reclen; 1145 } 1146 sx_xunlock(&dmp->dm_lock); 1147 uio->uio_offset = off; 1148 1149 /* 1150 * Restore ap->a_ncookies if it wasn't originally NULL in the first 1151 * place. 1152 */ 1153 if (tmp_ncookies != NULL) 1154 ap->a_ncookies = tmp_ncookies; 1155 1156 return (error); 1157 } 1158 1159 static int 1160 devfs_readlink(struct vop_readlink_args *ap) 1161 { 1162 struct devfs_dirent *de; 1163 1164 de = ap->a_vp->v_data; 1165 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 1166 } 1167 1168 static int 1169 devfs_reclaim(struct vop_reclaim_args *ap) 1170 { 1171 struct vnode *vp = ap->a_vp; 1172 struct devfs_dirent *de; 1173 struct cdev *dev; 1174 1175 mtx_lock(&devfs_de_interlock); 1176 de = vp->v_data; 1177 if (de != NULL) { 1178 de->de_vnode = NULL; 1179 vp->v_data = NULL; 1180 } 1181 mtx_unlock(&devfs_de_interlock); 1182 1183 vnode_destroy_vobject(vp); 1184 1185 VI_LOCK(vp); 1186 dev_lock(); 1187 dev = vp->v_rdev; 1188 vp->v_rdev = NULL; 1189 1190 if (dev == NULL) { 1191 dev_unlock(); 1192 VI_UNLOCK(vp); 1193 return (0); 1194 } 1195 1196 dev->si_usecount -= vp->v_usecount; 1197 dev_unlock(); 1198 VI_UNLOCK(vp); 1199 dev_rel(dev); 1200 return (0); 1201 } 1202 1203 static int 1204 devfs_remove(struct vop_remove_args *ap) 1205 { 1206 struct vnode *vp = ap->a_vp; 1207 struct devfs_dirent *dd; 1208 struct devfs_dirent *de; 1209 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1210 1211 sx_xlock(&dmp->dm_lock); 1212 dd = ap->a_dvp->v_data; 1213 de = vp->v_data; 1214 if (de->de_cdp == NULL) { 1215 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1216 devfs_delete(dmp, de, 1); 1217 } else { 1218 de->de_flags |= DE_WHITEOUT; 1219 } 1220 sx_xunlock(&dmp->dm_lock); 1221 return (0); 1222 } 1223 1224 /* 1225 * Revoke is called on a tty when a terminal session ends. The vnode 1226 * is orphaned by setting v_op to deadfs so we need to let go of it 1227 * as well so that we create a new one next time around. 1228 * 1229 */ 1230 static int 1231 devfs_revoke(struct vop_revoke_args *ap) 1232 { 1233 struct vnode *vp = ap->a_vp, *vp2; 1234 struct cdev *dev; 1235 struct cdev_priv *cdp; 1236 struct devfs_dirent *de; 1237 int i; 1238 1239 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1240 1241 dev = vp->v_rdev; 1242 cdp = cdev2priv(dev); 1243 1244 dev_lock(); 1245 cdp->cdp_inuse++; 1246 dev_unlock(); 1247 1248 vhold(vp); 1249 vgone(vp); 1250 vdrop(vp); 1251 1252 VOP_UNLOCK(vp,0); 1253 loop: 1254 for (;;) { 1255 mtx_lock(&devfs_de_interlock); 1256 dev_lock(); 1257 vp2 = NULL; 1258 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1259 de = cdp->cdp_dirents[i]; 1260 if (de == NULL) 1261 continue; 1262 1263 vp2 = de->de_vnode; 1264 if (vp2 != NULL) { 1265 dev_unlock(); 1266 VI_LOCK(vp2); 1267 mtx_unlock(&devfs_de_interlock); 1268 if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK, 1269 curthread)) 1270 goto loop; 1271 vhold(vp2); 1272 vgone(vp2); 1273 vdrop(vp2); 1274 vput(vp2); 1275 break; 1276 } 1277 } 1278 if (vp2 != NULL) { 1279 continue; 1280 } 1281 dev_unlock(); 1282 mtx_unlock(&devfs_de_interlock); 1283 break; 1284 } 1285 dev_lock(); 1286 cdp->cdp_inuse--; 1287 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1288 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1289 dev_unlock(); 1290 dev_rel(&cdp->cdp_c); 1291 } else 1292 dev_unlock(); 1293 1294 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1295 return (0); 1296 } 1297 1298 static int 1299 devfs_rioctl(struct vop_ioctl_args *ap) 1300 { 1301 struct vnode *vp; 1302 struct devfs_mount *dmp; 1303 int error; 1304 1305 vp = ap->a_vp; 1306 vn_lock(vp, LK_SHARED | LK_RETRY); 1307 if (vp->v_iflag & VI_DOOMED) { 1308 VOP_UNLOCK(vp, 0); 1309 return (EBADF); 1310 } 1311 dmp = VFSTODEVFS(vp->v_mount); 1312 sx_xlock(&dmp->dm_lock); 1313 VOP_UNLOCK(vp, 0); 1314 DEVFS_DMP_HOLD(dmp); 1315 devfs_populate(dmp); 1316 if (DEVFS_DMP_DROP(dmp)) { 1317 sx_xunlock(&dmp->dm_lock); 1318 devfs_unmount_final(dmp); 1319 return (ENOENT); 1320 } 1321 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1322 sx_xunlock(&dmp->dm_lock); 1323 return (error); 1324 } 1325 1326 static int 1327 devfs_rread(struct vop_read_args *ap) 1328 { 1329 1330 if (ap->a_vp->v_type != VDIR) 1331 return (EINVAL); 1332 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1333 } 1334 1335 static int 1336 devfs_setattr(struct vop_setattr_args *ap) 1337 { 1338 struct devfs_dirent *de; 1339 struct vattr *vap; 1340 struct vnode *vp; 1341 struct thread *td; 1342 int c, error; 1343 uid_t uid; 1344 gid_t gid; 1345 1346 vap = ap->a_vap; 1347 vp = ap->a_vp; 1348 td = curthread; 1349 if ((vap->va_type != VNON) || 1350 (vap->va_nlink != VNOVAL) || 1351 (vap->va_fsid != VNOVAL) || 1352 (vap->va_fileid != VNOVAL) || 1353 (vap->va_blocksize != VNOVAL) || 1354 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1355 (vap->va_rdev != VNOVAL) || 1356 ((int)vap->va_bytes != VNOVAL) || 1357 (vap->va_gen != VNOVAL)) { 1358 return (EINVAL); 1359 } 1360 1361 de = vp->v_data; 1362 if (vp->v_type == VDIR) 1363 de = de->de_dir; 1364 1365 error = c = 0; 1366 if (vap->va_uid == (uid_t)VNOVAL) 1367 uid = de->de_uid; 1368 else 1369 uid = vap->va_uid; 1370 if (vap->va_gid == (gid_t)VNOVAL) 1371 gid = de->de_gid; 1372 else 1373 gid = vap->va_gid; 1374 if (uid != de->de_uid || gid != de->de_gid) { 1375 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1376 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1377 error = priv_check(td, PRIV_VFS_CHOWN); 1378 if (error) 1379 return (error); 1380 } 1381 de->de_uid = uid; 1382 de->de_gid = gid; 1383 c = 1; 1384 } 1385 1386 if (vap->va_mode != (mode_t)VNOVAL) { 1387 if (ap->a_cred->cr_uid != de->de_uid) { 1388 error = priv_check(td, PRIV_VFS_ADMIN); 1389 if (error) 1390 return (error); 1391 } 1392 de->de_mode = vap->va_mode; 1393 c = 1; 1394 } 1395 1396 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1397 /* See the comment in ufs_vnops::ufs_setattr(). */ 1398 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) && 1399 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1400 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td)))) 1401 return (error); 1402 if (vap->va_atime.tv_sec != VNOVAL) { 1403 if (vp->v_type == VCHR) 1404 vp->v_rdev->si_atime = vap->va_atime; 1405 else 1406 de->de_atime = vap->va_atime; 1407 } 1408 if (vap->va_mtime.tv_sec != VNOVAL) { 1409 if (vp->v_type == VCHR) 1410 vp->v_rdev->si_mtime = vap->va_mtime; 1411 else 1412 de->de_mtime = vap->va_mtime; 1413 } 1414 c = 1; 1415 } 1416 1417 if (c) { 1418 if (vp->v_type == VCHR) 1419 vfs_timestamp(&vp->v_rdev->si_ctime); 1420 else 1421 vfs_timestamp(&de->de_mtime); 1422 } 1423 return (0); 1424 } 1425 1426 #ifdef MAC 1427 static int 1428 devfs_setlabel(struct vop_setlabel_args *ap) 1429 { 1430 struct vnode *vp; 1431 struct devfs_dirent *de; 1432 1433 vp = ap->a_vp; 1434 de = vp->v_data; 1435 1436 mac_vnode_relabel(ap->a_cred, vp, ap->a_label); 1437 mac_devfs_update(vp->v_mount, de, vp); 1438 1439 return (0); 1440 } 1441 #endif 1442 1443 static int 1444 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) 1445 { 1446 1447 return (vnops.fo_stat(fp, sb, cred, td)); 1448 } 1449 1450 static int 1451 devfs_symlink(struct vop_symlink_args *ap) 1452 { 1453 int i, error; 1454 struct devfs_dirent *dd; 1455 struct devfs_dirent *de; 1456 struct devfs_mount *dmp; 1457 1458 error = priv_check(curthread, PRIV_DEVFS_SYMLINK); 1459 if (error) 1460 return(error); 1461 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1462 dd = ap->a_dvp->v_data; 1463 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1464 de->de_uid = 0; 1465 de->de_gid = 0; 1466 de->de_mode = 0755; 1467 de->de_inode = alloc_unr(devfs_inos); 1468 de->de_dirent->d_type = DT_LNK; 1469 i = strlen(ap->a_target) + 1; 1470 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1471 bcopy(ap->a_target, de->de_symlink, i); 1472 sx_xlock(&dmp->dm_lock); 1473 #ifdef MAC 1474 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1475 #endif 1476 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 1477 return (devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp)); 1478 } 1479 1480 static int 1481 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) 1482 { 1483 1484 return (vnops.fo_truncate(fp, length, cred, td)); 1485 } 1486 1487 /* ARGSUSED */ 1488 static int 1489 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 1490 { 1491 struct cdev *dev; 1492 int error, ioflag, resid; 1493 struct cdevsw *dsw; 1494 struct file *fpop; 1495 1496 fpop = td->td_fpop; 1497 error = devfs_fp_check(fp, &dev, &dsw); 1498 if (error) 1499 return (error); 1500 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1501 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1502 if (ioflag & O_DIRECT) 1503 ioflag |= IO_DIRECT; 1504 if ((flags & FOF_OFFSET) == 0) 1505 uio->uio_offset = fp->f_offset; 1506 1507 resid = uio->uio_resid; 1508 1509 error = dsw->d_write(dev, uio, ioflag); 1510 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1511 vfs_timestamp(&dev->si_ctime); 1512 dev->si_mtime = dev->si_ctime; 1513 } 1514 td->td_fpop = fpop; 1515 dev_relthread(dev); 1516 1517 if ((flags & FOF_OFFSET) == 0) 1518 fp->f_offset = uio->uio_offset; 1519 fp->f_nextoff = uio->uio_offset; 1520 return (error); 1521 } 1522 1523 dev_t 1524 dev2udev(struct cdev *x) 1525 { 1526 if (x == NULL) 1527 return (NODEV); 1528 return (cdev2priv(x)->cdp_inode); 1529 } 1530 1531 static struct fileops devfs_ops_f = { 1532 .fo_read = devfs_read_f, 1533 .fo_write = devfs_write_f, 1534 .fo_truncate = devfs_truncate_f, 1535 .fo_ioctl = devfs_ioctl_f, 1536 .fo_poll = devfs_poll_f, 1537 .fo_kqfilter = devfs_kqfilter_f, 1538 .fo_stat = devfs_stat_f, 1539 .fo_close = devfs_close_f, 1540 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 1541 }; 1542 1543 static struct vop_vector devfs_vnodeops = { 1544 .vop_default = &default_vnodeops, 1545 1546 .vop_access = devfs_access, 1547 .vop_getattr = devfs_getattr, 1548 .vop_ioctl = devfs_rioctl, 1549 .vop_lookup = devfs_lookup, 1550 .vop_mknod = devfs_mknod, 1551 .vop_pathconf = devfs_pathconf, 1552 .vop_read = devfs_rread, 1553 .vop_readdir = devfs_readdir, 1554 .vop_readlink = devfs_readlink, 1555 .vop_reclaim = devfs_reclaim, 1556 .vop_remove = devfs_remove, 1557 .vop_revoke = devfs_revoke, 1558 .vop_setattr = devfs_setattr, 1559 #ifdef MAC 1560 .vop_setlabel = devfs_setlabel, 1561 #endif 1562 .vop_symlink = devfs_symlink, 1563 .vop_vptocnp = devfs_vptocnp, 1564 }; 1565 1566 static struct vop_vector devfs_specops = { 1567 .vop_default = &default_vnodeops, 1568 1569 .vop_access = devfs_access, 1570 .vop_bmap = VOP_PANIC, 1571 .vop_close = devfs_close, 1572 .vop_create = VOP_PANIC, 1573 .vop_fsync = devfs_fsync, 1574 .vop_getattr = devfs_getattr, 1575 .vop_link = VOP_PANIC, 1576 .vop_mkdir = VOP_PANIC, 1577 .vop_mknod = VOP_PANIC, 1578 .vop_open = devfs_open, 1579 .vop_pathconf = devfs_pathconf, 1580 .vop_print = devfs_print, 1581 .vop_read = VOP_PANIC, 1582 .vop_readdir = VOP_PANIC, 1583 .vop_readlink = VOP_PANIC, 1584 .vop_reallocblks = VOP_PANIC, 1585 .vop_reclaim = devfs_reclaim, 1586 .vop_remove = devfs_remove, 1587 .vop_rename = VOP_PANIC, 1588 .vop_revoke = devfs_revoke, 1589 .vop_rmdir = VOP_PANIC, 1590 .vop_setattr = devfs_setattr, 1591 #ifdef MAC 1592 .vop_setlabel = devfs_setlabel, 1593 #endif 1594 .vop_strategy = VOP_PANIC, 1595 .vop_symlink = VOP_PANIC, 1596 .vop_vptocnp = devfs_vptocnp, 1597 .vop_write = VOP_PANIC, 1598 }; 1599 1600 /* 1601 * Our calling convention to the device drivers used to be that we passed 1602 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 1603 * flags instead since that's what open(), close() and ioctl() takes and 1604 * we don't really want vnode.h in device drivers. 1605 * We solved the source compatibility by redefining some vnode flags to 1606 * be the same as the fcntl ones and by sending down the bitwise OR of 1607 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 1608 * pulls the rug out under this. 1609 */ 1610 CTASSERT(O_NONBLOCK == IO_NDELAY); 1611 CTASSERT(O_FSYNC == IO_SYNC); 1612