1 /*- 2 * Copyright (c) 2000-2004 3 * Poul-Henning Kamp. All rights reserved. 4 * Copyright (c) 1989, 1992-1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95 32 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43 33 * 34 * $FreeBSD$ 35 */ 36 37 /* 38 * TODO: 39 * remove empty directories 40 * mkdir: want it ? 41 */ 42 43 #include "opt_mac.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/conf.h> 48 #include <sys/dirent.h> 49 #include <sys/fcntl.h> 50 #include <sys/file.h> 51 #include <sys/filedesc.h> 52 #include <sys/filio.h> 53 #include <sys/kernel.h> 54 #include <sys/lock.h> 55 #include <sys/malloc.h> 56 #include <sys/mount.h> 57 #include <sys/namei.h> 58 #include <sys/priv.h> 59 #include <sys/proc.h> 60 #include <sys/stat.h> 61 #include <sys/sx.h> 62 #include <sys/time.h> 63 #include <sys/ttycom.h> 64 #include <sys/unistd.h> 65 #include <sys/vnode.h> 66 67 static struct vop_vector devfs_vnodeops; 68 static struct vop_vector devfs_specops; 69 static struct fileops devfs_ops_f; 70 71 #include <fs/devfs/devfs.h> 72 #include <fs/devfs/devfs_int.h> 73 74 #include <security/mac/mac_framework.h> 75 76 static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data"); 77 78 struct mtx devfs_de_interlock; 79 MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF); 80 struct sx clone_drain_lock; 81 SX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock"); 82 struct mtx cdevpriv_mtx; 83 MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF); 84 85 static int 86 devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp) 87 { 88 89 *dswp = devvn_refthread(fp->f_vnode, devp); 90 if (*devp != fp->f_data) { 91 if (*dswp != NULL) 92 dev_relthread(*devp); 93 return (ENXIO); 94 } 95 KASSERT((*devp)->si_refcount > 0, 96 ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp))); 97 if (*dswp == NULL) 98 return (ENXIO); 99 curthread->td_fpop = fp; 100 return (0); 101 } 102 103 int 104 devfs_get_cdevpriv(void **datap) 105 { 106 struct file *fp; 107 struct cdev_privdata *p; 108 int error; 109 110 fp = curthread->td_fpop; 111 if (fp == NULL) 112 return (EBADF); 113 p = fp->f_cdevpriv; 114 if (p != NULL) { 115 error = 0; 116 *datap = p->cdpd_data; 117 } else 118 error = ENOENT; 119 return (error); 120 } 121 122 int 123 devfs_set_cdevpriv(void *priv, cdevpriv_dtr_t priv_dtr) 124 { 125 struct file *fp; 126 struct cdev_priv *cdp; 127 struct cdev_privdata *p; 128 int error; 129 130 fp = curthread->td_fpop; 131 if (fp == NULL) 132 return (ENOENT); 133 cdp = cdev2priv((struct cdev *)fp->f_data); 134 p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK); 135 p->cdpd_data = priv; 136 p->cdpd_dtr = priv_dtr; 137 p->cdpd_fp = fp; 138 mtx_lock(&cdevpriv_mtx); 139 if (fp->f_cdevpriv == NULL) { 140 LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list); 141 fp->f_cdevpriv = p; 142 mtx_unlock(&cdevpriv_mtx); 143 error = 0; 144 } else { 145 mtx_unlock(&cdevpriv_mtx); 146 free(p, M_CDEVPDATA); 147 error = EBUSY; 148 } 149 return (error); 150 } 151 152 void 153 devfs_destroy_cdevpriv(struct cdev_privdata *p) 154 { 155 156 mtx_assert(&cdevpriv_mtx, MA_OWNED); 157 p->cdpd_fp->f_cdevpriv = NULL; 158 LIST_REMOVE(p, cdpd_list); 159 mtx_unlock(&cdevpriv_mtx); 160 (p->cdpd_dtr)(p->cdpd_data); 161 free(p, M_CDEVPDATA); 162 } 163 164 void 165 devfs_fpdrop(struct file *fp) 166 { 167 struct cdev_privdata *p; 168 169 mtx_lock(&cdevpriv_mtx); 170 if ((p = fp->f_cdevpriv) == NULL) { 171 mtx_unlock(&cdevpriv_mtx); 172 return; 173 } 174 devfs_destroy_cdevpriv(p); 175 } 176 177 void 178 devfs_clear_cdevpriv(void) 179 { 180 struct file *fp; 181 182 fp = curthread->td_fpop; 183 if (fp == NULL) 184 return; 185 devfs_fpdrop(fp); 186 } 187 188 /* 189 * Construct the fully qualified path name relative to the mountpoint 190 */ 191 static char * 192 devfs_fqpn(char *buf, struct vnode *dvp, struct componentname *cnp) 193 { 194 int i; 195 struct devfs_dirent *de, *dd; 196 struct devfs_mount *dmp; 197 198 dmp = VFSTODEVFS(dvp->v_mount); 199 dd = dvp->v_data; 200 i = SPECNAMELEN; 201 buf[i] = '\0'; 202 i -= cnp->cn_namelen; 203 if (i < 0) 204 return (NULL); 205 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); 206 de = dd; 207 while (de != dmp->dm_rootdir) { 208 i--; 209 if (i < 0) 210 return (NULL); 211 buf[i] = '/'; 212 i -= de->de_dirent->d_namlen; 213 if (i < 0) 214 return (NULL); 215 bcopy(de->de_dirent->d_name, buf + i, 216 de->de_dirent->d_namlen); 217 de = TAILQ_FIRST(&de->de_dlist); /* "." */ 218 de = TAILQ_NEXT(de, de_list); /* ".." */ 219 de = de->de_dir; 220 } 221 return (buf + i); 222 } 223 224 static int 225 devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp, 226 struct devfs_dirent *de) 227 { 228 int not_found; 229 230 not_found = 0; 231 if (de->de_flags & DE_DOOMED) 232 not_found = 1; 233 if (DEVFS_DE_DROP(de)) { 234 KASSERT(not_found == 1, ("DEVFS de dropped but not doomed")); 235 devfs_dirent_free(de); 236 } 237 if (DEVFS_DMP_DROP(dmp)) { 238 KASSERT(not_found == 1, 239 ("DEVFS mount struct freed before dirent")); 240 not_found = 2; 241 sx_xunlock(&dmp->dm_lock); 242 devfs_unmount_final(dmp); 243 } 244 if (not_found == 1 || (drop_dm_lock && not_found != 2)) 245 sx_unlock(&dmp->dm_lock); 246 return (not_found); 247 } 248 249 static void 250 devfs_insmntque_dtr(struct vnode *vp, void *arg) 251 { 252 struct devfs_dirent *de; 253 254 de = (struct devfs_dirent *)arg; 255 mtx_lock(&devfs_de_interlock); 256 vp->v_data = NULL; 257 de->de_vnode = NULL; 258 mtx_unlock(&devfs_de_interlock); 259 vgone(vp); 260 vput(vp); 261 } 262 263 /* 264 * devfs_allocv shall be entered with dmp->dm_lock held, and it drops 265 * it on return. 266 */ 267 int 268 devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td) 269 { 270 int error; 271 struct vnode *vp; 272 struct cdev *dev; 273 struct devfs_mount *dmp; 274 275 KASSERT(td == curthread, ("devfs_allocv: td != curthread")); 276 dmp = VFSTODEVFS(mp); 277 if (de->de_flags & DE_DOOMED) { 278 sx_xunlock(&dmp->dm_lock); 279 return (ENOENT); 280 } 281 DEVFS_DE_HOLD(de); 282 DEVFS_DMP_HOLD(dmp); 283 mtx_lock(&devfs_de_interlock); 284 vp = de->de_vnode; 285 if (vp != NULL) { 286 VI_LOCK(vp); 287 mtx_unlock(&devfs_de_interlock); 288 sx_xunlock(&dmp->dm_lock); 289 error = vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td); 290 sx_xlock(&dmp->dm_lock); 291 if (devfs_allocv_drop_refs(0, dmp, de)) { 292 if (error == 0) 293 vput(vp); 294 return (ENOENT); 295 } 296 else if (error) { 297 sx_xunlock(&dmp->dm_lock); 298 return (error); 299 } 300 sx_xunlock(&dmp->dm_lock); 301 *vpp = vp; 302 return (0); 303 } 304 mtx_unlock(&devfs_de_interlock); 305 if (de->de_dirent->d_type == DT_CHR) { 306 if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { 307 devfs_allocv_drop_refs(1, dmp, de); 308 return (ENOENT); 309 } 310 dev = &de->de_cdp->cdp_c; 311 } else { 312 dev = NULL; 313 } 314 error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 315 if (error != 0) { 316 devfs_allocv_drop_refs(1, dmp, de); 317 printf("devfs_allocv: failed to allocate new vnode\n"); 318 return (error); 319 } 320 321 if (de->de_dirent->d_type == DT_CHR) { 322 vp->v_type = VCHR; 323 VI_LOCK(vp); 324 dev_lock(); 325 dev_refl(dev); 326 /* XXX: v_rdev should be protect by vnode lock */ 327 vp->v_rdev = dev; 328 KASSERT(vp->v_usecount == 1, 329 ("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount)); 330 dev->si_usecount += vp->v_usecount; 331 dev_unlock(); 332 VI_UNLOCK(vp); 333 vp->v_op = &devfs_specops; 334 } else if (de->de_dirent->d_type == DT_DIR) { 335 vp->v_type = VDIR; 336 } else if (de->de_dirent->d_type == DT_LNK) { 337 vp->v_type = VLNK; 338 } else { 339 vp->v_type = VBAD; 340 } 341 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS); 342 mtx_lock(&devfs_de_interlock); 343 vp->v_data = de; 344 de->de_vnode = vp; 345 mtx_unlock(&devfs_de_interlock); 346 error = insmntque1(vp, mp, devfs_insmntque_dtr, de); 347 if (error != 0) { 348 (void) devfs_allocv_drop_refs(1, dmp, de); 349 return (error); 350 } 351 if (devfs_allocv_drop_refs(0, dmp, de)) { 352 vput(vp); 353 return (ENOENT); 354 } 355 #ifdef MAC 356 mac_devfs_vnode_associate(mp, de, vp); 357 #endif 358 sx_xunlock(&dmp->dm_lock); 359 *vpp = vp; 360 return (0); 361 } 362 363 static int 364 devfs_access(struct vop_access_args *ap) 365 { 366 struct vnode *vp = ap->a_vp; 367 struct devfs_dirent *de; 368 int error; 369 370 de = vp->v_data; 371 if (vp->v_type == VDIR) 372 de = de->de_dir; 373 374 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 375 ap->a_accmode, ap->a_cred, NULL); 376 if (!error) 377 return (error); 378 if (error != EACCES) 379 return (error); 380 /* We do, however, allow access to the controlling terminal */ 381 if (!(ap->a_td->td_proc->p_flag & P_CONTROLT)) 382 return (error); 383 if (ap->a_td->td_proc->p_session->s_ttyvp == de->de_vnode) 384 return (0); 385 return (error); 386 } 387 388 /* ARGSUSED */ 389 static int 390 devfs_advlock(struct vop_advlock_args *ap) 391 { 392 393 return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL); 394 } 395 396 /* ARGSUSED */ 397 static int 398 devfs_close(struct vop_close_args *ap) 399 { 400 struct vnode *vp = ap->a_vp, *oldvp; 401 struct thread *td = ap->a_td; 402 struct cdev *dev = vp->v_rdev; 403 struct cdevsw *dsw; 404 int vp_locked, error; 405 406 /* 407 * Hack: a tty device that is a controlling terminal 408 * has a reference from the session structure. 409 * We cannot easily tell that a character device is 410 * a controlling terminal, unless it is the closing 411 * process' controlling terminal. In that case, 412 * if the reference count is 2 (this last descriptor 413 * plus the session), release the reference from the session. 414 */ 415 oldvp = NULL; 416 sx_xlock(&proctree_lock); 417 if (td && vp == td->td_proc->p_session->s_ttyvp) { 418 SESS_LOCK(td->td_proc->p_session); 419 VI_LOCK(vp); 420 if (count_dev(dev) == 2 && (vp->v_iflag & VI_DOOMED) == 0) { 421 td->td_proc->p_session->s_ttyvp = NULL; 422 oldvp = vp; 423 } 424 VI_UNLOCK(vp); 425 SESS_UNLOCK(td->td_proc->p_session); 426 } 427 sx_xunlock(&proctree_lock); 428 if (oldvp != NULL) 429 vrele(oldvp); 430 /* 431 * We do not want to really close the device if it 432 * is still in use unless we are trying to close it 433 * forcibly. Since every use (buffer, vnode, swap, cmap) 434 * holds a reference to the vnode, and because we mark 435 * any other vnodes that alias this device, when the 436 * sum of the reference counts on all the aliased 437 * vnodes descends to one, we are on last close. 438 */ 439 dsw = dev_refthread(dev); 440 if (dsw == NULL) 441 return (ENXIO); 442 VI_LOCK(vp); 443 if (vp->v_iflag & VI_DOOMED) { 444 /* Forced close. */ 445 } else if (dsw->d_flags & D_TRACKCLOSE) { 446 /* Keep device updated on status. */ 447 } else if (count_dev(dev) > 1) { 448 VI_UNLOCK(vp); 449 dev_relthread(dev); 450 return (0); 451 } 452 vholdl(vp); 453 VI_UNLOCK(vp); 454 vp_locked = VOP_ISLOCKED(vp); 455 VOP_UNLOCK(vp, 0); 456 KASSERT(dev->si_refcount > 0, 457 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 458 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 459 dev_relthread(dev); 460 vn_lock(vp, vp_locked | LK_RETRY); 461 vdrop(vp); 462 return (error); 463 } 464 465 static int 466 devfs_close_f(struct file *fp, struct thread *td) 467 { 468 int error; 469 struct file *fpop; 470 471 fpop = td->td_fpop; 472 td->td_fpop = fp; 473 error = vnops.fo_close(fp, td); 474 td->td_fpop = fpop; 475 return (error); 476 } 477 478 /* ARGSUSED */ 479 static int 480 devfs_fsync(struct vop_fsync_args *ap) 481 { 482 if (!vn_isdisk(ap->a_vp, NULL)) 483 return (0); 484 485 return (vop_stdfsync(ap)); 486 } 487 488 static int 489 devfs_getattr(struct vop_getattr_args *ap) 490 { 491 struct vnode *vp = ap->a_vp; 492 struct vattr *vap = ap->a_vap; 493 int error = 0; 494 struct devfs_dirent *de; 495 struct cdev *dev; 496 497 de = vp->v_data; 498 KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 499 if (vp->v_type == VDIR) { 500 de = de->de_dir; 501 KASSERT(de != NULL, 502 ("Null dir dirent in devfs_getattr vp=%p", vp)); 503 } 504 vap->va_uid = de->de_uid; 505 vap->va_gid = de->de_gid; 506 vap->va_mode = de->de_mode; 507 if (vp->v_type == VLNK) 508 vap->va_size = strlen(de->de_symlink); 509 else if (vp->v_type == VDIR) 510 vap->va_size = vap->va_bytes = DEV_BSIZE; 511 else 512 vap->va_size = 0; 513 if (vp->v_type != VDIR) 514 vap->va_bytes = 0; 515 vap->va_blocksize = DEV_BSIZE; 516 vap->va_type = vp->v_type; 517 518 #define fix(aa) \ 519 do { \ 520 if ((aa).tv_sec <= 3600) { \ 521 (aa).tv_sec = boottime.tv_sec; \ 522 (aa).tv_nsec = boottime.tv_usec * 1000; \ 523 } \ 524 } while (0) 525 526 if (vp->v_type != VCHR) { 527 fix(de->de_atime); 528 vap->va_atime = de->de_atime; 529 fix(de->de_mtime); 530 vap->va_mtime = de->de_mtime; 531 fix(de->de_ctime); 532 vap->va_ctime = de->de_ctime; 533 } else { 534 dev = vp->v_rdev; 535 fix(dev->si_atime); 536 vap->va_atime = dev->si_atime; 537 fix(dev->si_mtime); 538 vap->va_mtime = dev->si_mtime; 539 fix(dev->si_ctime); 540 vap->va_ctime = dev->si_ctime; 541 542 vap->va_rdev = cdev2priv(dev)->cdp_inode; 543 } 544 vap->va_gen = 0; 545 vap->va_flags = 0; 546 vap->va_filerev = 0; 547 vap->va_nlink = de->de_links; 548 vap->va_fileid = de->de_inode; 549 550 return (error); 551 } 552 553 /* ARGSUSED */ 554 static int 555 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 556 { 557 struct cdev *dev; 558 struct cdevsw *dsw; 559 struct vnode *vp; 560 struct vnode *vpold; 561 int error, i; 562 const char *p; 563 struct fiodgname_arg *fgn; 564 struct file *fpop; 565 566 fpop = td->td_fpop; 567 error = devfs_fp_check(fp, &dev, &dsw); 568 if (error) 569 return (error); 570 571 if (com == FIODTYPE) { 572 *(int *)data = dsw->d_flags & D_TYPEMASK; 573 td->td_fpop = fpop; 574 dev_relthread(dev); 575 return (0); 576 } else if (com == FIODGNAME) { 577 fgn = data; 578 p = devtoname(dev); 579 i = strlen(p) + 1; 580 if (i > fgn->len) 581 error = EINVAL; 582 else 583 error = copyout(p, fgn->buf, i); 584 td->td_fpop = fpop; 585 dev_relthread(dev); 586 return (error); 587 } 588 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td); 589 td->td_fpop = NULL; 590 dev_relthread(dev); 591 if (error == ENOIOCTL) 592 error = ENOTTY; 593 if (error == 0 && com == TIOCSCTTY) { 594 vp = fp->f_vnode; 595 596 /* Do nothing if reassigning same control tty */ 597 sx_slock(&proctree_lock); 598 if (td->td_proc->p_session->s_ttyvp == vp) { 599 sx_sunlock(&proctree_lock); 600 return (0); 601 } 602 603 vpold = td->td_proc->p_session->s_ttyvp; 604 VREF(vp); 605 SESS_LOCK(td->td_proc->p_session); 606 td->td_proc->p_session->s_ttyvp = vp; 607 SESS_UNLOCK(td->td_proc->p_session); 608 609 sx_sunlock(&proctree_lock); 610 611 /* Get rid of reference to old control tty */ 612 if (vpold) 613 vrele(vpold); 614 } 615 return (error); 616 } 617 618 /* ARGSUSED */ 619 static int 620 devfs_kqfilter_f(struct file *fp, struct knote *kn) 621 { 622 struct cdev *dev; 623 struct cdevsw *dsw; 624 int error; 625 struct file *fpop; 626 struct thread *td; 627 628 td = curthread; 629 fpop = td->td_fpop; 630 error = devfs_fp_check(fp, &dev, &dsw); 631 if (error) 632 return (error); 633 error = dsw->d_kqfilter(dev, kn); 634 td->td_fpop = fpop; 635 dev_relthread(dev); 636 return (error); 637 } 638 639 static int 640 devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 641 { 642 struct componentname *cnp; 643 struct vnode *dvp, **vpp; 644 struct thread *td; 645 struct devfs_dirent *de, *dd; 646 struct devfs_dirent **dde; 647 struct devfs_mount *dmp; 648 struct cdev *cdev; 649 int error, flags, nameiop; 650 char specname[SPECNAMELEN + 1], *pname; 651 652 cnp = ap->a_cnp; 653 vpp = ap->a_vpp; 654 dvp = ap->a_dvp; 655 pname = cnp->cn_nameptr; 656 td = cnp->cn_thread; 657 flags = cnp->cn_flags; 658 nameiop = cnp->cn_nameiop; 659 dmp = VFSTODEVFS(dvp->v_mount); 660 dd = dvp->v_data; 661 *vpp = NULLVP; 662 663 if ((flags & ISLASTCN) && nameiop == RENAME) 664 return (EOPNOTSUPP); 665 666 if (dvp->v_type != VDIR) 667 return (ENOTDIR); 668 669 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 670 return (EIO); 671 672 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 673 if (error) 674 return (error); 675 676 if (cnp->cn_namelen == 1 && *pname == '.') { 677 if ((flags & ISLASTCN) && nameiop != LOOKUP) 678 return (EINVAL); 679 *vpp = dvp; 680 VREF(dvp); 681 return (0); 682 } 683 684 if (flags & ISDOTDOT) { 685 if ((flags & ISLASTCN) && nameiop != LOOKUP) 686 return (EINVAL); 687 VOP_UNLOCK(dvp, 0); 688 de = TAILQ_FIRST(&dd->de_dlist); /* "." */ 689 de = TAILQ_NEXT(de, de_list); /* ".." */ 690 de = de->de_dir; 691 error = devfs_allocv(de, dvp->v_mount, vpp, td); 692 *dm_unlock = 0; 693 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 694 return (error); 695 } 696 697 DEVFS_DMP_HOLD(dmp); 698 devfs_populate(dmp); 699 if (DEVFS_DMP_DROP(dmp)) { 700 *dm_unlock = 0; 701 sx_xunlock(&dmp->dm_lock); 702 devfs_unmount_final(dmp); 703 return (ENOENT); 704 } 705 dd = dvp->v_data; 706 de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen); 707 while (de == NULL) { /* While(...) so we can use break */ 708 709 if (nameiop == DELETE) 710 return (ENOENT); 711 712 /* 713 * OK, we didn't have an entry for the name we were asked for 714 * so we try to see if anybody can create it on demand. 715 */ 716 pname = devfs_fqpn(specname, dvp, cnp); 717 if (pname == NULL) 718 break; 719 720 cdev = NULL; 721 DEVFS_DMP_HOLD(dmp); 722 sx_xunlock(&dmp->dm_lock); 723 sx_slock(&clone_drain_lock); 724 EVENTHANDLER_INVOKE(dev_clone, 725 td->td_ucred, pname, strlen(pname), &cdev); 726 sx_sunlock(&clone_drain_lock); 727 sx_xlock(&dmp->dm_lock); 728 if (DEVFS_DMP_DROP(dmp)) { 729 *dm_unlock = 0; 730 sx_xunlock(&dmp->dm_lock); 731 devfs_unmount_final(dmp); 732 return (ENOENT); 733 } 734 if (cdev == NULL) 735 break; 736 737 DEVFS_DMP_HOLD(dmp); 738 devfs_populate(dmp); 739 if (DEVFS_DMP_DROP(dmp)) { 740 *dm_unlock = 0; 741 sx_xunlock(&dmp->dm_lock); 742 devfs_unmount_final(dmp); 743 return (ENOENT); 744 } 745 746 dev_lock(); 747 dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx]; 748 if (dde != NULL && *dde != NULL) 749 de = *dde; 750 dev_unlock(); 751 dev_rel(cdev); 752 break; 753 } 754 755 if (de == NULL || de->de_flags & DE_WHITEOUT) { 756 if ((nameiop == CREATE || nameiop == RENAME) && 757 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 758 cnp->cn_flags |= SAVENAME; 759 return (EJUSTRETURN); 760 } 761 return (ENOENT); 762 } 763 764 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 765 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 766 if (error) 767 return (error); 768 if (*vpp == dvp) { 769 VREF(dvp); 770 *vpp = dvp; 771 return (0); 772 } 773 } 774 error = devfs_allocv(de, dvp->v_mount, vpp, td); 775 *dm_unlock = 0; 776 return (error); 777 } 778 779 static int 780 devfs_lookup(struct vop_lookup_args *ap) 781 { 782 int j; 783 struct devfs_mount *dmp; 784 int dm_unlock; 785 786 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 787 dm_unlock = 1; 788 sx_xlock(&dmp->dm_lock); 789 j = devfs_lookupx(ap, &dm_unlock); 790 if (dm_unlock == 1) 791 sx_xunlock(&dmp->dm_lock); 792 return (j); 793 } 794 795 static int 796 devfs_mknod(struct vop_mknod_args *ap) 797 { 798 struct componentname *cnp; 799 struct vnode *dvp, **vpp; 800 struct thread *td; 801 struct devfs_dirent *dd, *de; 802 struct devfs_mount *dmp; 803 int error; 804 805 /* 806 * The only type of node we should be creating here is a 807 * character device, for anything else return EOPNOTSUPP. 808 */ 809 if (ap->a_vap->va_type != VCHR) 810 return (EOPNOTSUPP); 811 dvp = ap->a_dvp; 812 dmp = VFSTODEVFS(dvp->v_mount); 813 814 cnp = ap->a_cnp; 815 vpp = ap->a_vpp; 816 td = cnp->cn_thread; 817 dd = dvp->v_data; 818 819 error = ENOENT; 820 sx_xlock(&dmp->dm_lock); 821 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 822 if (cnp->cn_namelen != de->de_dirent->d_namlen) 823 continue; 824 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 825 de->de_dirent->d_namlen) != 0) 826 continue; 827 if (de->de_flags & DE_WHITEOUT) 828 break; 829 goto notfound; 830 } 831 if (de == NULL) 832 goto notfound; 833 de->de_flags &= ~DE_WHITEOUT; 834 error = devfs_allocv(de, dvp->v_mount, vpp, td); 835 return (error); 836 notfound: 837 sx_xunlock(&dmp->dm_lock); 838 return (error); 839 } 840 841 /* ARGSUSED */ 842 static int 843 devfs_open(struct vop_open_args *ap) 844 { 845 struct thread *td = ap->a_td; 846 struct vnode *vp = ap->a_vp; 847 struct cdev *dev = vp->v_rdev; 848 struct file *fp = ap->a_fp; 849 int error; 850 struct cdevsw *dsw; 851 struct file *fpop; 852 853 if (vp->v_type == VBLK) 854 return (ENXIO); 855 856 if (dev == NULL) 857 return (ENXIO); 858 859 /* Make this field valid before any I/O in d_open. */ 860 if (dev->si_iosize_max == 0) 861 dev->si_iosize_max = DFLTPHYS; 862 863 dsw = dev_refthread(dev); 864 if (dsw == NULL) 865 return (ENXIO); 866 867 /* XXX: Special casing of ttys for deadfs. Probably redundant. */ 868 if (dsw->d_flags & D_TTY) 869 vp->v_vflag |= VV_ISTTY; 870 871 VOP_UNLOCK(vp, 0); 872 873 fpop = td->td_fpop; 874 td->td_fpop = fp; 875 if (fp != NULL) 876 fp->f_data = dev; 877 if (dsw->d_fdopen != NULL) 878 error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 879 else 880 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 881 td->td_fpop = fpop; 882 883 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 884 885 dev_relthread(dev); 886 887 if (error) 888 return (error); 889 890 #if 0 /* /dev/console */ 891 KASSERT(fp != NULL, 892 ("Could not vnode bypass device on NULL fp")); 893 #else 894 if(fp == NULL) 895 return (error); 896 #endif 897 if (fp->f_ops == &badfileops) 898 finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f); 899 return (error); 900 } 901 902 static int 903 devfs_pathconf(struct vop_pathconf_args *ap) 904 { 905 906 switch (ap->a_name) { 907 case _PC_MAC_PRESENT: 908 #ifdef MAC 909 /* 910 * If MAC is enabled, devfs automatically supports 911 * trivial non-persistant label storage. 912 */ 913 *ap->a_retval = 1; 914 #else 915 *ap->a_retval = 0; 916 #endif 917 return (0); 918 default: 919 return (vop_stdpathconf(ap)); 920 } 921 /* NOTREACHED */ 922 } 923 924 /* ARGSUSED */ 925 static int 926 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 927 { 928 struct cdev *dev; 929 struct cdevsw *dsw; 930 int error; 931 struct file *fpop; 932 933 fpop = td->td_fpop; 934 error = devfs_fp_check(fp, &dev, &dsw); 935 if (error) 936 return (error); 937 error = dsw->d_poll(dev, events, td); 938 td->td_fpop = fpop; 939 dev_relthread(dev); 940 return(error); 941 } 942 943 /* 944 * Print out the contents of a special device vnode. 945 */ 946 static int 947 devfs_print(struct vop_print_args *ap) 948 { 949 950 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 951 return (0); 952 } 953 954 /* ARGSUSED */ 955 static int 956 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 957 { 958 struct cdev *dev; 959 int ioflag, error, resid; 960 struct cdevsw *dsw; 961 struct file *fpop; 962 963 fpop = td->td_fpop; 964 error = devfs_fp_check(fp, &dev, &dsw); 965 if (error) 966 return (error); 967 resid = uio->uio_resid; 968 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 969 if (ioflag & O_DIRECT) 970 ioflag |= IO_DIRECT; 971 972 if ((flags & FOF_OFFSET) == 0) 973 uio->uio_offset = fp->f_offset; 974 975 error = dsw->d_read(dev, uio, ioflag); 976 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 977 vfs_timestamp(&dev->si_atime); 978 td->td_fpop = fpop; 979 dev_relthread(dev); 980 981 if ((flags & FOF_OFFSET) == 0) 982 fp->f_offset = uio->uio_offset; 983 fp->f_nextoff = uio->uio_offset; 984 return (error); 985 } 986 987 static int 988 devfs_readdir(struct vop_readdir_args *ap) 989 { 990 int error; 991 struct uio *uio; 992 struct dirent *dp; 993 struct devfs_dirent *dd; 994 struct devfs_dirent *de; 995 struct devfs_mount *dmp; 996 off_t off, oldoff; 997 int *tmp_ncookies = NULL; 998 999 if (ap->a_vp->v_type != VDIR) 1000 return (ENOTDIR); 1001 1002 uio = ap->a_uio; 1003 if (uio->uio_offset < 0) 1004 return (EINVAL); 1005 1006 /* 1007 * XXX: This is a temporary hack to get around this filesystem not 1008 * supporting cookies. We store the location of the ncookies pointer 1009 * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 1010 * and set the number of cookies to 0. We then set the pointer to 1011 * NULL so that vfs_read_dirent doesn't try to call realloc() on 1012 * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 1013 * pointer to its original location before returning to the caller. 1014 */ 1015 if (ap->a_ncookies != NULL) { 1016 tmp_ncookies = ap->a_ncookies; 1017 *ap->a_ncookies = 0; 1018 ap->a_ncookies = NULL; 1019 } 1020 1021 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1022 sx_xlock(&dmp->dm_lock); 1023 DEVFS_DMP_HOLD(dmp); 1024 devfs_populate(dmp); 1025 if (DEVFS_DMP_DROP(dmp)) { 1026 sx_xunlock(&dmp->dm_lock); 1027 devfs_unmount_final(dmp); 1028 if (tmp_ncookies != NULL) 1029 ap->a_ncookies = tmp_ncookies; 1030 return (EIO); 1031 } 1032 error = 0; 1033 de = ap->a_vp->v_data; 1034 off = 0; 1035 oldoff = uio->uio_offset; 1036 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 1037 KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 1038 if (dd->de_flags & DE_WHITEOUT) 1039 continue; 1040 if (dd->de_dirent->d_type == DT_DIR) 1041 de = dd->de_dir; 1042 else 1043 de = dd; 1044 dp = dd->de_dirent; 1045 if (dp->d_reclen > uio->uio_resid) 1046 break; 1047 dp->d_fileno = de->de_inode; 1048 if (off >= uio->uio_offset) { 1049 error = vfs_read_dirent(ap, dp, off); 1050 if (error) 1051 break; 1052 } 1053 off += dp->d_reclen; 1054 } 1055 sx_xunlock(&dmp->dm_lock); 1056 uio->uio_offset = off; 1057 1058 /* 1059 * Restore ap->a_ncookies if it wasn't originally NULL in the first 1060 * place. 1061 */ 1062 if (tmp_ncookies != NULL) 1063 ap->a_ncookies = tmp_ncookies; 1064 1065 return (error); 1066 } 1067 1068 static int 1069 devfs_readlink(struct vop_readlink_args *ap) 1070 { 1071 struct devfs_dirent *de; 1072 1073 de = ap->a_vp->v_data; 1074 return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 1075 } 1076 1077 static int 1078 devfs_reclaim(struct vop_reclaim_args *ap) 1079 { 1080 struct vnode *vp = ap->a_vp; 1081 struct devfs_dirent *de; 1082 struct cdev *dev; 1083 1084 mtx_lock(&devfs_de_interlock); 1085 de = vp->v_data; 1086 if (de != NULL) { 1087 de->de_vnode = NULL; 1088 vp->v_data = NULL; 1089 } 1090 mtx_unlock(&devfs_de_interlock); 1091 1092 vnode_destroy_vobject(vp); 1093 1094 VI_LOCK(vp); 1095 dev_lock(); 1096 dev = vp->v_rdev; 1097 vp->v_rdev = NULL; 1098 1099 if (dev == NULL) { 1100 dev_unlock(); 1101 VI_UNLOCK(vp); 1102 return (0); 1103 } 1104 1105 dev->si_usecount -= vp->v_usecount; 1106 dev_unlock(); 1107 VI_UNLOCK(vp); 1108 dev_rel(dev); 1109 return (0); 1110 } 1111 1112 static int 1113 devfs_remove(struct vop_remove_args *ap) 1114 { 1115 struct vnode *vp = ap->a_vp; 1116 struct devfs_dirent *dd; 1117 struct devfs_dirent *de; 1118 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1119 1120 sx_xlock(&dmp->dm_lock); 1121 dd = ap->a_dvp->v_data; 1122 de = vp->v_data; 1123 if (de->de_cdp == NULL) { 1124 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1125 devfs_delete(dmp, de, 1); 1126 } else { 1127 de->de_flags |= DE_WHITEOUT; 1128 } 1129 sx_xunlock(&dmp->dm_lock); 1130 return (0); 1131 } 1132 1133 /* 1134 * Revoke is called on a tty when a terminal session ends. The vnode 1135 * is orphaned by setting v_op to deadfs so we need to let go of it 1136 * as well so that we create a new one next time around. 1137 * 1138 */ 1139 static int 1140 devfs_revoke(struct vop_revoke_args *ap) 1141 { 1142 struct vnode *vp = ap->a_vp, *vp2; 1143 struct cdev *dev; 1144 struct cdev_priv *cdp; 1145 struct devfs_dirent *de; 1146 int i; 1147 1148 KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1149 1150 dev = vp->v_rdev; 1151 cdp = cdev2priv(dev); 1152 1153 dev_lock(); 1154 cdp->cdp_inuse++; 1155 dev_unlock(); 1156 1157 vhold(vp); 1158 vgone(vp); 1159 vdrop(vp); 1160 1161 VOP_UNLOCK(vp,0); 1162 loop: 1163 for (;;) { 1164 mtx_lock(&devfs_de_interlock); 1165 dev_lock(); 1166 vp2 = NULL; 1167 for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1168 de = cdp->cdp_dirents[i]; 1169 if (de == NULL) 1170 continue; 1171 1172 vp2 = de->de_vnode; 1173 if (vp2 != NULL) { 1174 dev_unlock(); 1175 VI_LOCK(vp2); 1176 mtx_unlock(&devfs_de_interlock); 1177 if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK, 1178 curthread)) 1179 goto loop; 1180 vhold(vp2); 1181 vgone(vp2); 1182 vdrop(vp2); 1183 vput(vp2); 1184 break; 1185 } 1186 } 1187 if (vp2 != NULL) { 1188 continue; 1189 } 1190 dev_unlock(); 1191 mtx_unlock(&devfs_de_interlock); 1192 break; 1193 } 1194 dev_lock(); 1195 cdp->cdp_inuse--; 1196 if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1197 TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1198 dev_unlock(); 1199 dev_rel(&cdp->cdp_c); 1200 } else 1201 dev_unlock(); 1202 1203 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1204 return (0); 1205 } 1206 1207 static int 1208 devfs_rioctl(struct vop_ioctl_args *ap) 1209 { 1210 int error; 1211 struct devfs_mount *dmp; 1212 1213 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1214 sx_xlock(&dmp->dm_lock); 1215 DEVFS_DMP_HOLD(dmp); 1216 devfs_populate(dmp); 1217 if (DEVFS_DMP_DROP(dmp)) { 1218 sx_xunlock(&dmp->dm_lock); 1219 devfs_unmount_final(dmp); 1220 return (ENOENT); 1221 } 1222 error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1223 sx_xunlock(&dmp->dm_lock); 1224 return (error); 1225 } 1226 1227 static int 1228 devfs_rread(struct vop_read_args *ap) 1229 { 1230 1231 if (ap->a_vp->v_type != VDIR) 1232 return (EINVAL); 1233 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1234 } 1235 1236 static int 1237 devfs_setattr(struct vop_setattr_args *ap) 1238 { 1239 struct devfs_dirent *de; 1240 struct vattr *vap; 1241 struct vnode *vp; 1242 struct thread *td; 1243 int c, error; 1244 uid_t uid; 1245 gid_t gid; 1246 1247 vap = ap->a_vap; 1248 vp = ap->a_vp; 1249 td = curthread; 1250 if ((vap->va_type != VNON) || 1251 (vap->va_nlink != VNOVAL) || 1252 (vap->va_fsid != VNOVAL) || 1253 (vap->va_fileid != VNOVAL) || 1254 (vap->va_blocksize != VNOVAL) || 1255 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1256 (vap->va_rdev != VNOVAL) || 1257 ((int)vap->va_bytes != VNOVAL) || 1258 (vap->va_gen != VNOVAL)) { 1259 return (EINVAL); 1260 } 1261 1262 de = vp->v_data; 1263 if (vp->v_type == VDIR) 1264 de = de->de_dir; 1265 1266 error = c = 0; 1267 if (vap->va_uid == (uid_t)VNOVAL) 1268 uid = de->de_uid; 1269 else 1270 uid = vap->va_uid; 1271 if (vap->va_gid == (gid_t)VNOVAL) 1272 gid = de->de_gid; 1273 else 1274 gid = vap->va_gid; 1275 if (uid != de->de_uid || gid != de->de_gid) { 1276 if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1277 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1278 error = priv_check(td, PRIV_VFS_CHOWN); 1279 if (error) 1280 return (error); 1281 } 1282 de->de_uid = uid; 1283 de->de_gid = gid; 1284 c = 1; 1285 } 1286 1287 if (vap->va_mode != (mode_t)VNOVAL) { 1288 if (ap->a_cred->cr_uid != de->de_uid) { 1289 error = priv_check(td, PRIV_VFS_ADMIN); 1290 if (error) 1291 return (error); 1292 } 1293 de->de_mode = vap->va_mode; 1294 c = 1; 1295 } 1296 1297 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1298 /* See the comment in ufs_vnops::ufs_setattr(). */ 1299 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) && 1300 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1301 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td)))) 1302 return (error); 1303 if (vap->va_atime.tv_sec != VNOVAL) { 1304 if (vp->v_type == VCHR) 1305 vp->v_rdev->si_atime = vap->va_atime; 1306 else 1307 de->de_atime = vap->va_atime; 1308 } 1309 if (vap->va_mtime.tv_sec != VNOVAL) { 1310 if (vp->v_type == VCHR) 1311 vp->v_rdev->si_mtime = vap->va_mtime; 1312 else 1313 de->de_mtime = vap->va_mtime; 1314 } 1315 c = 1; 1316 } 1317 1318 if (c) { 1319 if (vp->v_type == VCHR) 1320 vfs_timestamp(&vp->v_rdev->si_ctime); 1321 else 1322 vfs_timestamp(&de->de_mtime); 1323 } 1324 return (0); 1325 } 1326 1327 #ifdef MAC 1328 static int 1329 devfs_setlabel(struct vop_setlabel_args *ap) 1330 { 1331 struct vnode *vp; 1332 struct devfs_dirent *de; 1333 1334 vp = ap->a_vp; 1335 de = vp->v_data; 1336 1337 mac_vnode_relabel(ap->a_cred, vp, ap->a_label); 1338 mac_devfs_update(vp->v_mount, de, vp); 1339 1340 return (0); 1341 } 1342 #endif 1343 1344 static int 1345 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) 1346 { 1347 1348 return (vnops.fo_stat(fp, sb, cred, td)); 1349 } 1350 1351 static int 1352 devfs_symlink(struct vop_symlink_args *ap) 1353 { 1354 int i, error; 1355 struct devfs_dirent *dd; 1356 struct devfs_dirent *de; 1357 struct devfs_mount *dmp; 1358 struct thread *td; 1359 1360 td = ap->a_cnp->cn_thread; 1361 KASSERT(td == curthread, ("devfs_symlink: td != curthread")); 1362 1363 error = priv_check(td, PRIV_DEVFS_SYMLINK); 1364 if (error) 1365 return(error); 1366 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1367 dd = ap->a_dvp->v_data; 1368 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1369 de->de_uid = 0; 1370 de->de_gid = 0; 1371 de->de_mode = 0755; 1372 de->de_inode = alloc_unr(devfs_inos); 1373 de->de_dirent->d_type = DT_LNK; 1374 i = strlen(ap->a_target) + 1; 1375 de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1376 bcopy(ap->a_target, de->de_symlink, i); 1377 sx_xlock(&dmp->dm_lock); 1378 #ifdef MAC 1379 mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1380 #endif 1381 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 1382 return (devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, td)); 1383 } 1384 1385 static int 1386 devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) 1387 { 1388 1389 return (vnops.fo_truncate(fp, length, cred, td)); 1390 } 1391 1392 /* ARGSUSED */ 1393 static int 1394 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 1395 { 1396 struct cdev *dev; 1397 int error, ioflag, resid; 1398 struct cdevsw *dsw; 1399 struct file *fpop; 1400 1401 fpop = td->td_fpop; 1402 error = devfs_fp_check(fp, &dev, &dsw); 1403 if (error) 1404 return (error); 1405 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1406 ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1407 if (ioflag & O_DIRECT) 1408 ioflag |= IO_DIRECT; 1409 if ((flags & FOF_OFFSET) == 0) 1410 uio->uio_offset = fp->f_offset; 1411 1412 resid = uio->uio_resid; 1413 1414 error = dsw->d_write(dev, uio, ioflag); 1415 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1416 vfs_timestamp(&dev->si_ctime); 1417 dev->si_mtime = dev->si_ctime; 1418 } 1419 td->td_fpop = fpop; 1420 dev_relthread(dev); 1421 1422 if ((flags & FOF_OFFSET) == 0) 1423 fp->f_offset = uio->uio_offset; 1424 fp->f_nextoff = uio->uio_offset; 1425 return (error); 1426 } 1427 1428 dev_t 1429 dev2udev(struct cdev *x) 1430 { 1431 if (x == NULL) 1432 return (NODEV); 1433 return (cdev2priv(x)->cdp_inode); 1434 } 1435 1436 static struct fileops devfs_ops_f = { 1437 .fo_read = devfs_read_f, 1438 .fo_write = devfs_write_f, 1439 .fo_truncate = devfs_truncate_f, 1440 .fo_ioctl = devfs_ioctl_f, 1441 .fo_poll = devfs_poll_f, 1442 .fo_kqfilter = devfs_kqfilter_f, 1443 .fo_stat = devfs_stat_f, 1444 .fo_close = devfs_close_f, 1445 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 1446 }; 1447 1448 static struct vop_vector devfs_vnodeops = { 1449 .vop_default = &default_vnodeops, 1450 1451 .vop_access = devfs_access, 1452 .vop_getattr = devfs_getattr, 1453 .vop_ioctl = devfs_rioctl, 1454 .vop_lookup = devfs_lookup, 1455 .vop_mknod = devfs_mknod, 1456 .vop_pathconf = devfs_pathconf, 1457 .vop_read = devfs_rread, 1458 .vop_readdir = devfs_readdir, 1459 .vop_readlink = devfs_readlink, 1460 .vop_reclaim = devfs_reclaim, 1461 .vop_remove = devfs_remove, 1462 .vop_revoke = devfs_revoke, 1463 .vop_setattr = devfs_setattr, 1464 #ifdef MAC 1465 .vop_setlabel = devfs_setlabel, 1466 #endif 1467 .vop_symlink = devfs_symlink, 1468 }; 1469 1470 static struct vop_vector devfs_specops = { 1471 .vop_default = &default_vnodeops, 1472 1473 .vop_access = devfs_access, 1474 .vop_advlock = devfs_advlock, 1475 .vop_bmap = VOP_PANIC, 1476 .vop_close = devfs_close, 1477 .vop_create = VOP_PANIC, 1478 .vop_fsync = devfs_fsync, 1479 .vop_getattr = devfs_getattr, 1480 .vop_lease = VOP_NULL, 1481 .vop_link = VOP_PANIC, 1482 .vop_mkdir = VOP_PANIC, 1483 .vop_mknod = VOP_PANIC, 1484 .vop_open = devfs_open, 1485 .vop_pathconf = devfs_pathconf, 1486 .vop_print = devfs_print, 1487 .vop_read = VOP_PANIC, 1488 .vop_readdir = VOP_PANIC, 1489 .vop_readlink = VOP_PANIC, 1490 .vop_reallocblks = VOP_PANIC, 1491 .vop_reclaim = devfs_reclaim, 1492 .vop_remove = devfs_remove, 1493 .vop_rename = VOP_PANIC, 1494 .vop_revoke = devfs_revoke, 1495 .vop_rmdir = VOP_PANIC, 1496 .vop_setattr = devfs_setattr, 1497 #ifdef MAC 1498 .vop_setlabel = devfs_setlabel, 1499 #endif 1500 .vop_strategy = VOP_PANIC, 1501 .vop_symlink = VOP_PANIC, 1502 .vop_write = VOP_PANIC, 1503 }; 1504 1505 /* 1506 * Our calling convention to the device drivers used to be that we passed 1507 * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 1508 * flags instead since that's what open(), close() and ioctl() takes and 1509 * we don't really want vnode.h in device drivers. 1510 * We solved the source compatibility by redefining some vnode flags to 1511 * be the same as the fcntl ones and by sending down the bitwise OR of 1512 * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 1513 * pulls the rug out under this. 1514 */ 1515 CTASSERT(O_NONBLOCK == IO_NDELAY); 1516 CTASSERT(O_FSYNC == IO_SYNC); 1517