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 * mknod: hunt down DE_DELETED, compare name, reinstantiate. 41 * mkdir: want it ? 42 */ 43 44 #include <opt_devfs.h> 45 #include <opt_mac.h> 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/conf.h> 50 #include <sys/dirent.h> 51 #include <sys/fcntl.h> 52 #include <sys/file.h> 53 #include <sys/filedesc.h> 54 #include <sys/filio.h> 55 #include <sys/kernel.h> 56 #include <sys/lock.h> 57 #include <sys/mac.h> 58 #include <sys/malloc.h> 59 #include <sys/mount.h> 60 #include <sys/namei.h> 61 #include <sys/proc.h> 62 #include <sys/stat.h> 63 #include <sys/sx.h> 64 #include <sys/time.h> 65 #include <sys/ttycom.h> 66 #include <sys/unistd.h> 67 #include <sys/vnode.h> 68 69 #include <fs/devfs/devfs.h> 70 71 static int devfs_fops = 0; 72 73 static fo_rdwr_t devfs_read_f; 74 static fo_rdwr_t devfs_write_f; 75 static fo_ioctl_t devfs_ioctl_f; 76 static fo_poll_t devfs_poll_f; 77 static fo_kqfilter_t devfs_kqfilter_f; 78 static fo_stat_t devfs_stat_f; 79 static fo_close_t devfs_close_f; 80 81 struct fileops devfs_ops_f = { 82 .fo_read = devfs_read_f, 83 .fo_write = devfs_write_f, 84 .fo_ioctl = devfs_ioctl_f, 85 .fo_poll = devfs_poll_f, 86 .fo_kqfilter = devfs_kqfilter_f, 87 .fo_stat = devfs_stat_f, 88 .fo_close = devfs_close_f, 89 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 90 }; 91 92 static int devfs_access(struct vop_access_args *ap); 93 static int devfs_advlock(struct vop_advlock_args *ap); 94 static int devfs_close(struct vop_close_args *ap); 95 static int devfs_fsync(struct vop_fsync_args *ap); 96 static int devfs_getattr(struct vop_getattr_args *ap); 97 static int devfs_ioctl(struct vop_ioctl_args *ap); 98 static int devfs_kqfilter(struct vop_kqfilter_args *ap); 99 static int devfs_lookupx(struct vop_lookup_args *ap); 100 static int devfs_mknod(struct vop_mknod_args *ap); 101 static int devfs_open(struct vop_open_args *ap); 102 static int devfs_pathconf(struct vop_pathconf_args *ap); 103 static int devfs_poll(struct vop_poll_args *ap); 104 static int devfs_print(struct vop_print_args *ap); 105 static int devfs_read(struct vop_read_args *ap); 106 static int devfs_readdir(struct vop_readdir_args *ap); 107 static int devfs_readlink(struct vop_readlink_args *ap); 108 static int devfs_reclaim(struct vop_reclaim_args *ap); 109 static int devfs_remove(struct vop_remove_args *ap); 110 static int devfs_revoke(struct vop_revoke_args *ap); 111 static int devfs_rioctl(struct vop_ioctl_args *ap); 112 static int devfs_rread(struct vop_read_args *ap); 113 static int devfs_setattr(struct vop_setattr_args *ap); 114 #ifdef MAC 115 static int devfs_setlabel(struct vop_setlabel_args *ap); 116 #endif 117 static int devfs_symlink(struct vop_symlink_args *ap); 118 static int devfs_write(struct vop_write_args *ap); 119 120 static vop_t **devfs_vnodeop_p; 121 vop_t **devfs_specop_p; 122 123 /* 124 * Construct the fully qualified path name relative to the mountpoint 125 */ 126 static char * 127 devfs_fqpn(char *buf, struct vnode *dvp, struct componentname *cnp) 128 { 129 int i; 130 struct devfs_dirent *de, *dd; 131 struct devfs_mount *dmp; 132 133 dmp = VFSTODEVFS(dvp->v_mount); 134 dd = dvp->v_data; 135 i = SPECNAMELEN; 136 buf[i] = '\0'; 137 i -= cnp->cn_namelen; 138 if (i < 0) 139 return (NULL); 140 bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); 141 de = dd; 142 while (de != dmp->dm_basedir) { 143 i--; 144 if (i < 0) 145 return (NULL); 146 buf[i] = '/'; 147 i -= de->de_dirent->d_namlen; 148 if (i < 0) 149 return (NULL); 150 bcopy(de->de_dirent->d_name, buf + i, 151 de->de_dirent->d_namlen); 152 de = TAILQ_FIRST(&de->de_dlist); /* "." */ 153 de = TAILQ_NEXT(de, de_list); /* ".." */ 154 de = de->de_dir; 155 } 156 return (buf + i); 157 } 158 159 int 160 devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td) 161 { 162 int error; 163 struct vnode *vp; 164 struct cdev *dev; 165 166 KASSERT(td == curthread, ("devfs_allocv: td != curthread")); 167 loop: 168 vp = de->de_vnode; 169 if (vp != NULL) { 170 if (vget(vp, LK_EXCLUSIVE, td)) 171 goto loop; 172 *vpp = vp; 173 return (0); 174 } 175 if (de->de_dirent->d_type == DT_CHR) { 176 dev = *devfs_itod(de->de_inode); 177 if (dev == NULL) 178 return (ENOENT); 179 } else { 180 dev = NULL; 181 } 182 error = getnewvnode("devfs", mp, devfs_vnodeop_p, &vp); 183 if (error != 0) { 184 printf("devfs_allocv: failed to allocate new vnode\n"); 185 return (error); 186 } 187 188 if (de->de_dirent->d_type == DT_CHR) { 189 vp->v_type = VCHR; 190 vp = addaliasu(vp, dev->si_udev); 191 vp->v_op = devfs_specop_p; 192 } else if (de->de_dirent->d_type == DT_DIR) { 193 vp->v_type = VDIR; 194 } else if (de->de_dirent->d_type == DT_LNK) { 195 vp->v_type = VLNK; 196 } else { 197 vp->v_type = VBAD; 198 } 199 vp->v_data = de; 200 de->de_vnode = vp; 201 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 202 #ifdef MAC 203 mac_associate_vnode_devfs(mp, de, vp); 204 #endif 205 *vpp = vp; 206 return (0); 207 } 208 209 static int 210 devfs_access(ap) 211 struct vop_access_args /* { 212 struct vnode *a_vp; 213 int a_mode; 214 struct ucred *a_cred; 215 struct thread *a_td; 216 } */ *ap; 217 { 218 struct vnode *vp = ap->a_vp; 219 struct devfs_dirent *de; 220 int error; 221 222 de = vp->v_data; 223 if (vp->v_type == VDIR) 224 de = de->de_dir; 225 226 error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 227 ap->a_mode, ap->a_cred, NULL); 228 if (!error) 229 return (error); 230 if (error != EACCES) 231 return (error); 232 /* We do, however, allow access to the controlling terminal */ 233 if (!(ap->a_td->td_proc->p_flag & P_CONTROLT)) 234 return (error); 235 if (ap->a_td->td_proc->p_session->s_ttyvp == de->de_vnode) 236 return (0); 237 return (error); 238 } 239 240 /* 241 * Special device advisory byte-level locks. 242 */ 243 /* ARGSUSED */ 244 static int 245 devfs_advlock(ap) 246 struct vop_advlock_args /* { 247 struct vnode *a_vp; 248 caddr_t a_id; 249 int a_op; 250 struct flock *a_fl; 251 int a_flags; 252 } */ *ap; 253 { 254 255 return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL); 256 } 257 258 /* 259 * Device close routine 260 */ 261 /* ARGSUSED */ 262 static int 263 devfs_close(ap) 264 struct vop_close_args /* { 265 struct vnode *a_vp; 266 int a_fflag; 267 struct ucred *a_cred; 268 struct thread *a_td; 269 } */ *ap; 270 { 271 struct vnode *vp = ap->a_vp, *oldvp; 272 struct thread *td = ap->a_td; 273 struct cdev *dev = vp->v_rdev; 274 struct cdevsw *dsw; 275 int error; 276 277 /* 278 * Hack: a tty device that is a controlling terminal 279 * has a reference from the session structure. 280 * We cannot easily tell that a character device is 281 * a controlling terminal, unless it is the closing 282 * process' controlling terminal. In that case, 283 * if the reference count is 2 (this last descriptor 284 * plus the session), release the reference from the session. 285 */ 286 287 /* 288 * This needs to be rewritten to take the vp interlock into 289 * consideration. 290 */ 291 292 oldvp = NULL; 293 sx_xlock(&proctree_lock); 294 if (td && vp == td->td_proc->p_session->s_ttyvp) { 295 SESS_LOCK(td->td_proc->p_session); 296 VI_LOCK(vp); 297 if (count_dev(dev) == 2 && (vp->v_iflag & VI_XLOCK) == 0) { 298 td->td_proc->p_session->s_ttyvp = NULL; 299 oldvp = vp; 300 } 301 VI_UNLOCK(vp); 302 SESS_UNLOCK(td->td_proc->p_session); 303 } 304 sx_xunlock(&proctree_lock); 305 if (oldvp != NULL) 306 vrele(oldvp); 307 /* 308 * We do not want to really close the device if it 309 * is still in use unless we are trying to close it 310 * forcibly. Since every use (buffer, vnode, swap, cmap) 311 * holds a reference to the vnode, and because we mark 312 * any other vnodes that alias this device, when the 313 * sum of the reference counts on all the aliased 314 * vnodes descends to one, we are on last close. 315 */ 316 dsw = dev_refthread(dev); 317 if (dsw == NULL) 318 return (ENXIO); 319 VI_LOCK(vp); 320 if (vp->v_iflag & VI_XLOCK) { 321 /* Forced close. */ 322 } else if (dsw->d_flags & D_TRACKCLOSE) { 323 /* Keep device updated on status. */ 324 } else if (count_dev(dev) > 1) { 325 VI_UNLOCK(vp); 326 dev_relthread(dev); 327 return (0); 328 } 329 VI_UNLOCK(vp); 330 KASSERT(dev->si_refcount > 0, 331 ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 332 if (!(dsw->d_flags & D_NEEDGIANT)) { 333 DROP_GIANT(); 334 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 335 PICKUP_GIANT(); 336 } else 337 error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 338 dev_relthread(dev); 339 return (error); 340 } 341 342 static int 343 devfs_close_f(struct file *fp, struct thread *td) 344 { 345 struct cdev *dev; 346 347 dev = fp->f_data; 348 #if 0 349 printf("devfs_close_f(%s)\n", devtoname(dev)); 350 #endif 351 return (vnops.fo_close(fp, td)); 352 } 353 354 /* 355 * Synch buffers associated with a block device 356 */ 357 /* ARGSUSED */ 358 static int 359 devfs_fsync(ap) 360 struct vop_fsync_args /* { 361 struct vnode *a_vp; 362 struct ucred *a_cred; 363 int a_waitfor; 364 struct thread *a_td; 365 } */ *ap; 366 { 367 if (!vn_isdisk(ap->a_vp, NULL)) 368 return (0); 369 370 return (vop_stdfsync(ap)); 371 } 372 373 static int 374 devfs_getattr(ap) 375 struct vop_getattr_args /* { 376 struct vnode *a_vp; 377 struct vattr *a_vap; 378 struct ucred *a_cred; 379 struct thread *a_td; 380 } */ *ap; 381 { 382 struct vnode *vp = ap->a_vp; 383 struct vattr *vap = ap->a_vap; 384 int error = 0; 385 struct devfs_dirent *de; 386 struct cdev *dev; 387 388 de = vp->v_data; 389 if (vp->v_type == VDIR) 390 de = de->de_dir; 391 bzero((caddr_t) vap, sizeof(*vap)); 392 vattr_null(vap); 393 vap->va_uid = de->de_uid; 394 vap->va_gid = de->de_gid; 395 vap->va_mode = de->de_mode; 396 if (vp->v_type == VLNK) 397 vap->va_size = strlen(de->de_symlink); 398 else if (vp->v_type == VDIR) 399 vap->va_size = vap->va_bytes = DEV_BSIZE; 400 else 401 vap->va_size = 0; 402 if (vp->v_type != VDIR) 403 vap->va_bytes = 0; 404 vap->va_blocksize = DEV_BSIZE; 405 vap->va_type = vp->v_type; 406 407 #define fix(aa) \ 408 do { \ 409 if ((aa).tv_sec == 0) { \ 410 (aa).tv_sec = boottime.tv_sec; \ 411 (aa).tv_nsec = boottime.tv_usec * 1000; \ 412 } \ 413 } while (0) 414 415 if (vp->v_type != VCHR) { 416 fix(de->de_atime); 417 vap->va_atime = de->de_atime; 418 fix(de->de_mtime); 419 vap->va_mtime = de->de_mtime; 420 fix(de->de_ctime); 421 vap->va_ctime = de->de_ctime; 422 } else { 423 dev = vp->v_rdev; 424 fix(dev->si_atime); 425 vap->va_atime = dev->si_atime; 426 fix(dev->si_mtime); 427 vap->va_mtime = dev->si_mtime; 428 fix(dev->si_ctime); 429 vap->va_ctime = dev->si_ctime; 430 vap->va_rdev = dev->si_udev; 431 } 432 vap->va_gen = 0; 433 vap->va_flags = 0; 434 vap->va_nlink = de->de_links; 435 vap->va_fileid = de->de_inode; 436 437 return (error); 438 } 439 440 /* 441 * Device ioctl operation. 442 */ 443 /* ARGSUSED */ 444 static int 445 devfs_ioctl(ap) 446 struct vop_ioctl_args /* { 447 struct vnode *a_vp; 448 u_long a_command; 449 caddr_t a_data; 450 int a_fflag; 451 struct ucred *a_cred; 452 struct thread *a_td; 453 } */ *ap; 454 { 455 struct cdev *dev; 456 int error; 457 struct cdevsw *dsw; 458 459 dev = ap->a_vp->v_rdev; 460 dsw = dev_refthread(dev); 461 if (dsw == NULL) 462 return (ENXIO); 463 KASSERT(dev->si_refcount > 0, 464 ("devfs_ioctl() on un-referenced struct cdev *(%s)", devtoname(dev))); 465 if (!(dsw->d_flags & D_NEEDGIANT)) { 466 DROP_GIANT(); 467 error = dsw->d_ioctl(dev, ap->a_command, 468 ap->a_data, ap->a_fflag, ap->a_td); 469 PICKUP_GIANT(); 470 } else 471 error = dsw->d_ioctl(dev, ap->a_command, 472 ap->a_data, ap->a_fflag, ap->a_td); 473 dev_relthread(dev); 474 if (error == ENOIOCTL) 475 error = ENOTTY; 476 return (error); 477 } 478 479 static int 480 devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 481 { 482 struct cdev *dev; 483 struct cdevsw *dsw; 484 struct vnode *vp = fp->f_vnode; 485 struct vnode *vpold; 486 int error; 487 488 dev = fp->f_data; 489 #if 0 490 printf("devfs_ioctl_f(%s)\n", devtoname(dev)); 491 #endif 492 KASSERT(dev->si_refcount > 0, 493 ("devfs_ioctl() on un-referenced struct cdev *(%s)", 494 devtoname(dev))); 495 dsw = dev_refthread(dev); 496 if (dsw == NULL) 497 return (ENXIO); 498 499 if (com == FIODTYPE) { 500 *(int *)data = dsw->d_flags & D_TYPEMASK; 501 dev_relthread(dev); 502 return (0); 503 } 504 if (dsw->d_flags & D_NEEDGIANT) 505 mtx_lock(&Giant); 506 error = dsw->d_ioctl(dev, com, data, fp->f_flag, td); 507 if (dsw->d_flags & D_NEEDGIANT) 508 mtx_unlock(&Giant); 509 dev_relthread(dev); 510 if (error == ENOIOCTL) 511 error = ENOTTY; 512 if (error == 0 && com == TIOCSCTTY) { 513 514 /* Do nothing if reassigning same control tty */ 515 sx_slock(&proctree_lock); 516 if (td->td_proc->p_session->s_ttyvp == vp) { 517 sx_sunlock(&proctree_lock); 518 return (0); 519 } 520 521 mtx_lock(&Giant); 522 523 vpold = td->td_proc->p_session->s_ttyvp; 524 VREF(vp); 525 SESS_LOCK(td->td_proc->p_session); 526 td->td_proc->p_session->s_ttyvp = vp; 527 SESS_UNLOCK(td->td_proc->p_session); 528 529 sx_sunlock(&proctree_lock); 530 531 /* Get rid of reference to old control tty */ 532 if (vpold) 533 vrele(vpold); 534 mtx_unlock(&Giant); 535 } 536 return (error); 537 } 538 539 540 /* ARGSUSED */ 541 static int 542 devfs_kqfilter(ap) 543 struct vop_kqfilter_args /* { 544 struct vnode *a_vp; 545 struct knote *a_kn; 546 } */ *ap; 547 { 548 struct cdev *dev; 549 struct cdevsw *dsw; 550 int error; 551 552 dev = ap->a_vp->v_rdev; 553 dsw = dev_refthread(dev); 554 if (dsw == NULL) 555 return(0); 556 KASSERT(dev->si_refcount > 0, 557 ("devfs_kqfilter() on un-referenced struct cdev *(%s)", devtoname(dev))); 558 if (!(dsw->d_flags & D_NEEDGIANT)) { 559 DROP_GIANT(); 560 error = dsw->d_kqfilter(dev, ap->a_kn); 561 PICKUP_GIANT(); 562 } else 563 error = dsw->d_kqfilter(dev, ap->a_kn); 564 dev_relthread(dev); 565 return (error); 566 } 567 568 static int 569 devfs_kqfilter_f(struct file *fp, struct knote *kn) 570 { 571 struct cdev *dev; 572 struct cdevsw *dsw; 573 int error; 574 575 dev = fp->f_data; 576 #if 0 577 printf("devfs_kqfilter_f(%s)\n", devtoname(dev)); 578 #endif 579 KASSERT(dev->si_refcount > 0, 580 ("devfs_kqfilter() on un-referenced struct cdev *(%s)", 581 devtoname(dev))); 582 dsw = dev_refthread(dev); 583 if (dsw == NULL) 584 return(0); 585 if (dsw->d_flags & D_NEEDGIANT) 586 mtx_lock(&Giant); 587 error = dsw->d_kqfilter(dev, kn); 588 if (dsw->d_flags & D_NEEDGIANT) 589 mtx_unlock(&Giant); 590 dev_relthread(dev); 591 return (error); 592 } 593 594 static int 595 devfs_lookupx(ap) 596 struct vop_lookup_args /* { 597 struct vnode * a_dvp; 598 struct vnode ** a_vpp; 599 struct componentname * a_cnp; 600 } */ *ap; 601 { 602 struct componentname *cnp; 603 struct vnode *dvp, **vpp; 604 struct thread *td; 605 struct devfs_dirent *de, *dd; 606 struct devfs_dirent **dde; 607 struct devfs_mount *dmp; 608 struct cdev *cdev; 609 int error, flags, nameiop; 610 char specname[SPECNAMELEN + 1], *pname; 611 612 cnp = ap->a_cnp; 613 vpp = ap->a_vpp; 614 dvp = ap->a_dvp; 615 pname = cnp->cn_nameptr; 616 td = cnp->cn_thread; 617 flags = cnp->cn_flags; 618 nameiop = cnp->cn_nameiop; 619 dmp = VFSTODEVFS(dvp->v_mount); 620 dd = dvp->v_data; 621 622 *vpp = NULLVP; 623 cnp->cn_flags &= ~PDIRUNLOCK; 624 625 if ((flags & ISLASTCN) && nameiop == RENAME) 626 return (EOPNOTSUPP); 627 628 if (dvp->v_type != VDIR) 629 return (ENOTDIR); 630 631 if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 632 return (EIO); 633 634 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 635 if (error) 636 return (error); 637 638 if (cnp->cn_namelen == 1 && *pname == '.') { 639 if ((flags & ISLASTCN) && nameiop != LOOKUP) 640 return (EINVAL); 641 *vpp = dvp; 642 VREF(dvp); 643 return (0); 644 } 645 646 if (flags & ISDOTDOT) { 647 if ((flags & ISLASTCN) && nameiop != LOOKUP) 648 return (EINVAL); 649 VOP_UNLOCK(dvp, 0, td); 650 cnp->cn_flags |= PDIRUNLOCK; 651 de = TAILQ_FIRST(&dd->de_dlist); /* "." */ 652 de = TAILQ_NEXT(de, de_list); /* ".." */ 653 de = de->de_dir; 654 error = devfs_allocv(de, dvp->v_mount, vpp, td); 655 if (error || ((flags & LOCKPARENT) && (flags & ISLASTCN))) { 656 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 657 cnp->cn_flags &= ~PDIRUNLOCK; 658 } 659 return (error); 660 } 661 662 devfs_populate(dmp); 663 dd = dvp->v_data; 664 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 665 if (cnp->cn_namelen != de->de_dirent->d_namlen) 666 continue; 667 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 668 de->de_dirent->d_namlen) != 0) 669 continue; 670 if (de->de_flags & DE_WHITEOUT) 671 goto notfound; 672 goto found; 673 } 674 675 if (nameiop == DELETE) 676 goto notfound; 677 678 /* 679 * OK, we didn't have an entry for the name we were asked for 680 * so we try to see if anybody can create it on demand. 681 */ 682 pname = devfs_fqpn(specname, dvp, cnp); 683 if (pname == NULL) 684 goto notfound; 685 686 cdev = NULL; 687 EVENTHANDLER_INVOKE(dev_clone, pname, strlen(pname), &cdev); 688 if (cdev == NULL) 689 goto notfound; 690 691 devfs_populate(dmp); 692 693 dde = devfs_itode(dmp, cdev->si_inode); 694 695 if (dde == NULL || *dde == NULL || *dde == DE_DELETED) 696 goto notfound; 697 698 if ((*dde)->de_flags & DE_WHITEOUT) 699 goto notfound; 700 701 de = *dde; 702 goto found; 703 704 notfound: 705 706 if ((nameiop == CREATE || nameiop == RENAME) && 707 (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 708 cnp->cn_flags |= SAVENAME; 709 if (!(flags & LOCKPARENT)) { 710 VOP_UNLOCK(dvp, 0, td); 711 cnp->cn_flags |= PDIRUNLOCK; 712 } 713 return (EJUSTRETURN); 714 } 715 return (ENOENT); 716 717 718 found: 719 720 if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 721 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 722 if (error) 723 return (error); 724 if (*vpp == dvp) { 725 VREF(dvp); 726 *vpp = dvp; 727 return (0); 728 } 729 error = devfs_allocv(de, dvp->v_mount, vpp, td); 730 if (error) 731 return (error); 732 if (!(flags & LOCKPARENT)) { 733 VOP_UNLOCK(dvp, 0, td); 734 cnp->cn_flags |= PDIRUNLOCK; 735 } 736 return (0); 737 } 738 error = devfs_allocv(de, dvp->v_mount, vpp, td); 739 if (error) 740 return (error); 741 if (!(flags & LOCKPARENT) || !(flags & ISLASTCN)) { 742 VOP_UNLOCK(dvp, 0, td); 743 cnp->cn_flags |= PDIRUNLOCK; 744 } 745 return (0); 746 } 747 748 static int 749 devfs_lookup(struct vop_lookup_args *ap) 750 { 751 int j; 752 struct devfs_mount *dmp; 753 754 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 755 lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread); 756 j = devfs_lookupx(ap); 757 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread); 758 return (j); 759 } 760 761 static int 762 devfs_mknod(struct vop_mknod_args *ap) 763 /* 764 struct vop_mknod_args { 765 struct vnodeop_desc *a_desc; 766 struct vnode *a_dvp; 767 struct vnode **a_vpp; 768 struct componentname *a_cnp; 769 struct vattr *a_vap; 770 }; */ 771 { 772 struct componentname *cnp; 773 struct vnode *dvp, **vpp; 774 struct thread *td; 775 struct devfs_dirent *dd, *de; 776 struct devfs_mount *dmp; 777 int error; 778 779 dvp = ap->a_dvp; 780 dmp = VFSTODEVFS(dvp->v_mount); 781 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread); 782 783 cnp = ap->a_cnp; 784 vpp = ap->a_vpp; 785 td = cnp->cn_thread; 786 dd = dvp->v_data; 787 788 error = ENOENT; 789 TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 790 if (cnp->cn_namelen != de->de_dirent->d_namlen) 791 continue; 792 if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 793 de->de_dirent->d_namlen) != 0) 794 continue; 795 if (de->de_flags & DE_WHITEOUT) 796 break; 797 goto notfound; 798 } 799 if (de == NULL) 800 goto notfound; 801 de->de_flags &= ~DE_WHITEOUT; 802 error = devfs_allocv(de, dvp->v_mount, vpp, td); 803 notfound: 804 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread); 805 return (error); 806 } 807 808 /* 809 * Open a special file. 810 */ 811 /* ARGSUSED */ 812 static int 813 devfs_open(ap) 814 struct vop_open_args /* { 815 struct vnode *a_vp; 816 int a_mode; 817 struct ucred *a_cred; 818 struct thread *a_td; 819 } */ *ap; 820 { 821 struct thread *td = ap->a_td; 822 struct vnode *vp = ap->a_vp; 823 struct cdev *dev = vp->v_rdev; 824 struct file *fp; 825 int error; 826 struct cdevsw *dsw; 827 static int once; 828 829 if (!once) { 830 TUNABLE_INT_FETCH("vfs.devfs.fops", &devfs_fops); 831 if (devfs_fops) 832 printf("WARNING: DEVFS uses fops\n"); 833 once = 1; 834 } 835 836 if (vp->v_type == VBLK) 837 return (ENXIO); 838 839 if (dev == NULL) 840 return (ENXIO); 841 842 /* Make this field valid before any I/O in d_open. */ 843 if (dev->si_iosize_max == 0) 844 dev->si_iosize_max = DFLTPHYS; 845 846 if (vn_isdisk(vp, NULL) && 847 ap->a_cred != FSCRED && (ap->a_mode & FWRITE)) { 848 /* 849 * When running in very secure mode, do not allow 850 * opens for writing of any disks. 851 * XXX: should be in geom_dev.c, but we lack the cred there. 852 */ 853 error = securelevel_ge(td->td_ucred, 2); 854 if (error) 855 return (error); 856 } 857 858 dsw = dev_refthread(dev); 859 if (dsw == NULL) 860 return (ENXIO); 861 862 /* XXX: Special casing of ttys for deadfs. Probably redundant. */ 863 if (dsw->d_flags & D_TTY) 864 vp->v_vflag |= VV_ISTTY; 865 866 VOP_UNLOCK(vp, 0, td); 867 868 if(!(dsw->d_flags & D_NEEDGIANT)) { 869 DROP_GIANT(); 870 if (dsw->d_fdopen != NULL) 871 error = dsw->d_fdopen(dev, ap->a_mode, td, ap->a_fdidx); 872 else 873 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 874 PICKUP_GIANT(); 875 } else if (dsw->d_fdopen != NULL) 876 error = dsw->d_fdopen(dev, ap->a_mode, td, ap->a_fdidx); 877 else 878 error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 879 880 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 881 882 dev_relthread(dev); 883 884 if (error) 885 return (error); 886 887 if (devfs_fops && ap->a_fdidx >= 0) { 888 /* 889 * This is a pretty disgustingly long chain, but I am not 890 * sure there is any better way. Passing the fdidx into 891 * VOP_OPEN() offers us more information than just passing 892 * the file *. 893 */ 894 fp = ap->a_td->td_proc->p_fd->fd_ofiles[ap->a_fdidx]; 895 if (fp->f_ops == &badfileops) { 896 #if 0 897 printf("devfs_open(%s)\n", devtoname(dev)); 898 #endif 899 fp->f_ops = &devfs_ops_f; 900 fp->f_data = dev; 901 } 902 } 903 904 return (error); 905 } 906 907 static int 908 devfs_pathconf(ap) 909 struct vop_pathconf_args /* { 910 struct vnode *a_vp; 911 int a_name; 912 int *a_retval; 913 } */ *ap; 914 { 915 916 switch (ap->a_name) { 917 case _PC_NAME_MAX: 918 *ap->a_retval = NAME_MAX; 919 return (0); 920 case _PC_PATH_MAX: 921 *ap->a_retval = PATH_MAX; 922 return (0); 923 case _PC_MAC_PRESENT: 924 #ifdef MAC 925 /* 926 * If MAC is enabled, devfs automatically supports 927 * trivial non-persistant label storage. 928 */ 929 *ap->a_retval = 1; 930 #else 931 *ap->a_retval = 0; 932 #endif 933 return (0); 934 default: 935 return (vop_stdpathconf(ap)); 936 } 937 /* NOTREACHED */ 938 } 939 940 /* ARGSUSED */ 941 static int 942 devfs_poll(ap) 943 struct vop_poll_args /* { 944 struct vnode *a_vp; 945 int a_events; 946 struct ucred *a_cred; 947 struct thread *a_td; 948 } */ *ap; 949 { 950 struct cdev *dev; 951 struct cdevsw *dsw; 952 int error; 953 954 dev = ap->a_vp->v_rdev; 955 dsw = dev_refthread(dev); 956 if (dsw == NULL) 957 return(0); 958 KASSERT(dev->si_refcount > 0, 959 ("devfs_poll() on un-referenced struct cdev *(%s)", devtoname(dev))); 960 if (!(dsw->d_flags & D_NEEDGIANT)) { 961 /* XXX: not yet DROP_GIANT(); */ 962 error = dsw->d_poll(dev, ap->a_events, ap->a_td); 963 /* XXX: not yet PICKUP_GIANT(); */ 964 } else 965 error = dsw->d_poll(dev, ap->a_events, ap->a_td); 966 dev_relthread(dev); 967 return(error); 968 } 969 970 static int 971 devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 972 { 973 struct cdev *dev; 974 struct cdevsw *dsw; 975 int error; 976 977 dev = fp->f_data; 978 #if 0 979 printf("devfs_poll_f(%s)\n", devtoname(dev)); 980 #endif 981 dsw = dev_refthread(dev); 982 if (dsw == NULL) 983 return (0); 984 KASSERT(dev->si_refcount > 0, 985 ("devfs_poll() on un-referenced struct cdev *(%s)", 986 devtoname(dev))); 987 if (dsw->d_flags & D_NEEDGIANT) 988 mtx_lock(&Giant); 989 error = dsw->d_poll(dev, events, td); 990 if (dsw->d_flags & D_NEEDGIANT) 991 mtx_unlock(&Giant); 992 dev_relthread(dev); 993 return(error); 994 } 995 996 /* 997 * Print out the contents of a special device vnode. 998 */ 999 static int 1000 devfs_print(ap) 1001 struct vop_print_args /* { 1002 struct vnode *a_vp; 1003 } */ *ap; 1004 { 1005 1006 printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 1007 return (0); 1008 } 1009 1010 /* 1011 * Vnode op for read 1012 */ 1013 /* ARGSUSED */ 1014 static int 1015 devfs_read(ap) 1016 struct vop_read_args /* { 1017 struct vnode *a_vp; 1018 struct uio *a_uio; 1019 int a_ioflag; 1020 struct ucred *a_cred; 1021 } */ *ap; 1022 { 1023 struct vnode *vp; 1024 struct thread *td; 1025 struct uio *uio; 1026 struct cdev *dev; 1027 int error, resid; 1028 struct cdevsw *dsw; 1029 1030 vp = ap->a_vp; 1031 dev = vp->v_rdev; 1032 uio = ap->a_uio; 1033 td = uio->uio_td; 1034 resid = uio->uio_resid; 1035 1036 if (resid == 0) 1037 return (0); 1038 1039 KASSERT(dev->si_refcount > 0, 1040 ("specread() on un-referenced struct cdev *(%s)", devtoname(dev))); 1041 dsw = dev_refthread(dev); 1042 if (dsw == NULL) 1043 return (ENXIO); 1044 VOP_UNLOCK(vp, 0, td); 1045 if (!(dsw->d_flags & D_NEEDGIANT)) { 1046 DROP_GIANT(); 1047 error = dsw->d_read(dev, uio, ap->a_ioflag); 1048 PICKUP_GIANT(); 1049 } else 1050 error = dsw->d_read(dev, uio, ap->a_ioflag); 1051 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 1052 dev_relthread(dev); 1053 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 1054 vfs_timestamp(&dev->si_atime); 1055 return (error); 1056 } 1057 1058 static int 1059 devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 1060 { 1061 struct cdev *dev; 1062 int ioflag, error, resid; 1063 struct cdevsw *dsw; 1064 struct vnode *vp; 1065 1066 dev = fp->f_data; 1067 #if 0 1068 /* 1069 * Enabling this one is dangerous, syslog will log once for each 1070 * read from /dev/klog so... 1071 */ 1072 printf("devfs_read_f(%s)\n", devtoname(dev)); 1073 #endif 1074 KASSERT(dev->si_refcount > 0, 1075 ("specread() on un-referenced struct cdev *(%s)", devtoname(dev))); 1076 dsw = dev_refthread(dev); 1077 if (dsw == NULL) 1078 return (ENXIO); 1079 1080 vp = fp->f_vnode; 1081 resid = uio->uio_resid; 1082 1083 ioflag = 0; 1084 if (fp->f_flag & FNONBLOCK) 1085 ioflag |= IO_NDELAY; 1086 if (fp->f_flag & O_DIRECT) 1087 ioflag |= IO_DIRECT; 1088 1089 if ((flags & FOF_OFFSET) == 0) 1090 uio->uio_offset = fp->f_offset; 1091 1092 if (dsw->d_flags & D_NEEDGIANT) 1093 mtx_lock(&Giant); 1094 error = dsw->d_read(dev, uio, ioflag); 1095 if (dsw->d_flags & D_NEEDGIANT) 1096 mtx_unlock(&Giant); 1097 dev_relthread(dev); 1098 if (uio->uio_resid != resid || (error == 0 && resid != 0)) 1099 vfs_timestamp(&dev->si_atime); 1100 1101 if ((flags & FOF_OFFSET) == 0) 1102 fp->f_offset = uio->uio_offset; 1103 fp->f_nextoff = uio->uio_offset; 1104 return (error); 1105 } 1106 1107 static int 1108 devfs_readdir(ap) 1109 struct vop_readdir_args /* { 1110 struct vnode *a_vp; 1111 struct uio *a_uio; 1112 struct ucred *a_cred; 1113 int *a_eofflag; 1114 int *a_ncookies; 1115 u_long **a_cookies; 1116 } */ *ap; 1117 { 1118 int error; 1119 struct uio *uio; 1120 struct dirent *dp; 1121 struct devfs_dirent *dd; 1122 struct devfs_dirent *de; 1123 struct devfs_mount *dmp; 1124 off_t off, oldoff; 1125 int ncookies = 0; 1126 u_long *cookiebuf, *cookiep; 1127 struct dirent *dps, *dpe; 1128 1129 if (ap->a_vp->v_type != VDIR) 1130 return (ENOTDIR); 1131 1132 uio = ap->a_uio; 1133 if (uio->uio_offset < 0) 1134 return (EINVAL); 1135 1136 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1137 lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread); 1138 devfs_populate(dmp); 1139 error = 0; 1140 de = ap->a_vp->v_data; 1141 off = 0; 1142 oldoff = uio->uio_offset; 1143 TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 1144 if (dd->de_flags & DE_WHITEOUT) 1145 continue; 1146 if (dd->de_dirent->d_type == DT_DIR) 1147 de = dd->de_dir; 1148 else 1149 de = dd; 1150 dp = dd->de_dirent; 1151 if (dp->d_reclen > uio->uio_resid) 1152 break; 1153 dp->d_fileno = de->de_inode; 1154 if (off >= uio->uio_offset) { 1155 ncookies++; 1156 error = uiomove(dp, dp->d_reclen, uio); 1157 if (error) 1158 break; 1159 } 1160 off += dp->d_reclen; 1161 } 1162 if( !error && ap->a_ncookies != NULL && ap->a_cookies != NULL ) { 1163 MALLOC(cookiebuf, u_long *, ncookies * sizeof(u_long), 1164 M_TEMP, M_WAITOK); 1165 cookiep = cookiebuf; 1166 dps = (struct dirent *)((char *)uio->uio_iov->iov_base - 1167 (uio->uio_offset - oldoff)); 1168 dpe = (struct dirent *) uio->uio_iov->iov_base; 1169 for( dp = dps; 1170 dp < dpe; 1171 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) { 1172 oldoff += dp->d_reclen; 1173 *cookiep++ = (u_long) oldoff; 1174 } 1175 *ap->a_ncookies = ncookies; 1176 *ap->a_cookies = cookiebuf; 1177 } 1178 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread); 1179 uio->uio_offset = off; 1180 return (error); 1181 } 1182 1183 static int 1184 devfs_readlink(ap) 1185 struct vop_readlink_args /* { 1186 struct vnode *a_vp; 1187 struct uio *a_uio; 1188 struct ucred *a_cead; 1189 } */ *ap; 1190 { 1191 int error; 1192 struct devfs_dirent *de; 1193 1194 de = ap->a_vp->v_data; 1195 error = uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio); 1196 return (error); 1197 } 1198 1199 static int 1200 devfs_reclaim(ap) 1201 struct vop_reclaim_args /* { 1202 struct vnode *a_vp; 1203 } */ *ap; 1204 { 1205 struct vnode *vp = ap->a_vp; 1206 struct devfs_dirent *de; 1207 int i; 1208 1209 de = vp->v_data; 1210 if (de != NULL) 1211 de->de_vnode = NULL; 1212 vp->v_data = NULL; 1213 if (vp->v_rdev != NULL && vp->v_rdev != NULL) { 1214 i = vcount(vp); 1215 if ((vp->v_rdev->si_flags & SI_CHEAPCLONE) && i == 0 && 1216 (vp->v_rdev->si_flags & SI_NAMED)) 1217 destroy_dev(vp->v_rdev); 1218 } 1219 return (0); 1220 } 1221 1222 static int 1223 devfs_remove(ap) 1224 struct vop_remove_args /* { 1225 struct vnode *a_dvp; 1226 struct vnode *a_vp; 1227 struct componentname *a_cnp; 1228 } */ *ap; 1229 { 1230 struct vnode *vp = ap->a_vp; 1231 struct devfs_dirent *dd; 1232 struct devfs_dirent *de; 1233 struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1234 1235 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread); 1236 dd = ap->a_dvp->v_data; 1237 de = vp->v_data; 1238 if (de->de_dirent->d_type == DT_LNK) { 1239 TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1240 if (de->de_vnode) 1241 de->de_vnode->v_data = NULL; 1242 #ifdef MAC 1243 mac_destroy_devfsdirent(de); 1244 #endif 1245 FREE(de, M_DEVFS); 1246 } else { 1247 de->de_flags |= DE_WHITEOUT; 1248 } 1249 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread); 1250 return (0); 1251 } 1252 1253 /* 1254 * Revoke is called on a tty when a terminal session ends. The vnode 1255 * is orphaned by setting v_op to deadfs so we need to let go of it 1256 * as well so that we create a new one next time around. 1257 */ 1258 static int 1259 devfs_revoke(ap) 1260 struct vop_revoke_args /* { 1261 struct vnode *a_vp; 1262 int a_flags; 1263 } */ *ap; 1264 { 1265 struct vnode *vp = ap->a_vp; 1266 struct devfs_dirent *de; 1267 1268 de = vp->v_data; 1269 de->de_vnode = NULL; 1270 vop_revoke(ap); 1271 return (0); 1272 } 1273 1274 static int 1275 devfs_rioctl(ap) 1276 struct vop_ioctl_args /* { 1277 struct vnode *a_vp; 1278 u_long a_command; 1279 caddr_t a_data; 1280 int a_fflag; 1281 struct ucred *a_cred; 1282 struct thread *a_td; 1283 } */ *ap; 1284 { 1285 int error; 1286 struct devfs_mount *dmp; 1287 1288 dmp = VFSTODEVFS(ap->a_vp->v_mount); 1289 lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread); 1290 devfs_populate(dmp); 1291 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread); 1292 error = devfs_rules_ioctl(ap->a_vp->v_mount, ap->a_command, ap->a_data, 1293 ap->a_td); 1294 return (error); 1295 } 1296 1297 static int 1298 devfs_rread(ap) 1299 struct vop_read_args /* { 1300 struct vnode *a_vp; 1301 struct uio *a_uio; 1302 int a_ioflag; 1303 struct ucred *a_cred; 1304 } */ *ap; 1305 { 1306 1307 if (ap->a_vp->v_type != VDIR) 1308 return (EINVAL); 1309 return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1310 } 1311 1312 static int 1313 devfs_setattr(ap) 1314 struct vop_setattr_args /* { 1315 struct vnode *a_vp; 1316 struct vattr *a_vap; 1317 struct ucred *a_cred; 1318 struct proc *a_p; 1319 } */ *ap; 1320 { 1321 struct devfs_dirent *de; 1322 struct vattr *vap; 1323 struct vnode *vp; 1324 int c, error; 1325 uid_t uid; 1326 gid_t gid; 1327 1328 vap = ap->a_vap; 1329 vp = ap->a_vp; 1330 if ((vap->va_type != VNON) || 1331 (vap->va_nlink != VNOVAL) || 1332 (vap->va_fsid != VNOVAL) || 1333 (vap->va_fileid != VNOVAL) || 1334 (vap->va_blocksize != VNOVAL) || 1335 (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1336 (vap->va_rdev != VNOVAL) || 1337 ((int)vap->va_bytes != VNOVAL) || 1338 (vap->va_gen != VNOVAL)) { 1339 return (EINVAL); 1340 } 1341 1342 de = vp->v_data; 1343 if (vp->v_type == VDIR) 1344 de = de->de_dir; 1345 1346 error = c = 0; 1347 if (vap->va_uid == (uid_t)VNOVAL) 1348 uid = de->de_uid; 1349 else 1350 uid = vap->va_uid; 1351 if (vap->va_gid == (gid_t)VNOVAL) 1352 gid = de->de_gid; 1353 else 1354 gid = vap->va_gid; 1355 if (uid != de->de_uid || gid != de->de_gid) { 1356 if (((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1357 (gid != de->de_gid && !groupmember(gid, ap->a_cred))) && 1358 (error = suser_cred(ap->a_td->td_ucred, SUSER_ALLOWJAIL)) != 0) 1359 return (error); 1360 de->de_uid = uid; 1361 de->de_gid = gid; 1362 c = 1; 1363 } 1364 1365 if (vap->va_mode != (mode_t)VNOVAL) { 1366 if ((ap->a_cred->cr_uid != de->de_uid) && 1367 (error = suser_cred(ap->a_td->td_ucred, SUSER_ALLOWJAIL))) 1368 return (error); 1369 de->de_mode = vap->va_mode; 1370 c = 1; 1371 } 1372 1373 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1374 /* See the comment in ufs_vnops::ufs_setattr(). */ 1375 if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) && 1376 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 1377 (error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td)))) 1378 return (error); 1379 if (vap->va_atime.tv_sec != VNOVAL) { 1380 if (vp->v_type == VCHR) 1381 vp->v_rdev->si_atime = vap->va_atime; 1382 else 1383 de->de_atime = vap->va_atime; 1384 } 1385 if (vap->va_mtime.tv_sec != VNOVAL) { 1386 if (vp->v_type == VCHR) 1387 vp->v_rdev->si_mtime = vap->va_mtime; 1388 else 1389 de->de_mtime = vap->va_mtime; 1390 } 1391 c = 1; 1392 } 1393 1394 if (c) { 1395 if (vp->v_type == VCHR) 1396 vfs_timestamp(&vp->v_rdev->si_ctime); 1397 else 1398 vfs_timestamp(&de->de_mtime); 1399 } 1400 return (0); 1401 } 1402 1403 #ifdef MAC 1404 static int 1405 devfs_setlabel(ap) 1406 struct vop_setlabel_args /* { 1407 struct vnode *a_vp; 1408 struct mac *a_label; 1409 struct ucred *a_cred; 1410 struct thread *a_td; 1411 } */ *ap; 1412 { 1413 struct vnode *vp; 1414 struct devfs_dirent *de; 1415 1416 vp = ap->a_vp; 1417 de = vp->v_data; 1418 1419 mac_relabel_vnode(ap->a_cred, vp, ap->a_label); 1420 mac_update_devfsdirent(vp->v_mount, de, vp); 1421 1422 return (0); 1423 } 1424 #endif 1425 1426 static int 1427 devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) 1428 { 1429 struct cdev *dev; 1430 1431 dev = fp->f_data; 1432 #if 0 1433 printf("devfs_stat_f(%s)\n", devtoname(dev)); 1434 #endif 1435 return (vnops.fo_stat(fp, sb, cred, td)); 1436 } 1437 1438 static int 1439 devfs_symlink(ap) 1440 struct vop_symlink_args /* { 1441 struct vnode *a_dvp; 1442 struct vnode **a_vpp; 1443 struct componentname *a_cnp; 1444 struct vattr *a_vap; 1445 char *a_target; 1446 } */ *ap; 1447 { 1448 int i, error; 1449 struct devfs_dirent *dd; 1450 struct devfs_dirent *de; 1451 struct devfs_mount *dmp; 1452 struct thread *td; 1453 1454 td = ap->a_cnp->cn_thread; 1455 KASSERT(td == curthread, ("devfs_symlink: td != curthread")); 1456 error = suser(td); 1457 if (error) 1458 return(error); 1459 dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1460 dd = ap->a_dvp->v_data; 1461 de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1462 de->de_uid = 0; 1463 de->de_gid = 0; 1464 de->de_mode = 0755; 1465 de->de_inode = dmp->dm_inode++; 1466 de->de_dirent->d_type = DT_LNK; 1467 i = strlen(ap->a_target) + 1; 1468 MALLOC(de->de_symlink, char *, i, M_DEVFS, M_WAITOK); 1469 bcopy(ap->a_target, de->de_symlink, i); 1470 lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, td); 1471 #ifdef MAC 1472 mac_create_devfs_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1473 #endif 1474 TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 1475 devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, td); 1476 lockmgr(&dmp->dm_lock, LK_RELEASE, 0, td); 1477 return (0); 1478 } 1479 1480 /* 1481 * Vnode op for write 1482 */ 1483 /* ARGSUSED */ 1484 static int 1485 devfs_write(ap) 1486 struct vop_write_args /* { 1487 struct vnode *a_vp; 1488 struct uio *a_uio; 1489 int a_ioflag; 1490 struct ucred *a_cred; 1491 } */ *ap; 1492 { 1493 struct vnode *vp; 1494 struct thread *td; 1495 struct uio *uio; 1496 struct cdev *dev; 1497 int error, resid; 1498 struct cdevsw *dsw; 1499 1500 vp = ap->a_vp; 1501 dev = vp->v_rdev; 1502 uio = ap->a_uio; 1503 td = uio->uio_td; 1504 resid = uio->uio_resid; 1505 1506 dsw = dev_refthread(dev); 1507 if (dsw == NULL) 1508 return (ENXIO); 1509 VOP_UNLOCK(vp, 0, td); 1510 KASSERT(dev->si_refcount > 0, 1511 ("devfs_write() on un-referenced struct cdev *(%s)", 1512 devtoname(dev))); 1513 if (!(dsw->d_flags & D_NEEDGIANT)) { 1514 DROP_GIANT(); 1515 error = dsw->d_write(dev, uio, ap->a_ioflag); 1516 PICKUP_GIANT(); 1517 } else 1518 error = dsw->d_write(dev, uio, ap->a_ioflag); 1519 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 1520 dev_relthread(dev); 1521 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1522 vfs_timestamp(&dev->si_ctime); 1523 dev->si_mtime = dev->si_ctime; 1524 } 1525 return (error); 1526 } 1527 1528 static int 1529 devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td) 1530 { 1531 struct cdev *dev; 1532 struct vnode *vp; 1533 int error, ioflag, resid; 1534 struct cdevsw *dsw; 1535 1536 dev = fp->f_data; 1537 #if 0 1538 printf("devfs_write_f(%s)\n", devtoname(dev)); 1539 #endif 1540 KASSERT(dev->si_refcount > 0, 1541 ("devfs_write() on un-referenced struct cdev *(%s)", 1542 devtoname(dev))); 1543 dsw = dev_refthread(dev); 1544 if (dsw == NULL) 1545 return (ENXIO); 1546 1547 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1548 vp = fp->f_vnode; 1549 ioflag = IO_UNIT; 1550 if (fp->f_flag & FNONBLOCK) 1551 ioflag |= IO_NDELAY; 1552 if (fp->f_flag & O_DIRECT) 1553 ioflag |= IO_DIRECT; 1554 if ((fp->f_flag & O_FSYNC) || 1555 (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) 1556 ioflag |= IO_SYNC; 1557 if ((flags & FOF_OFFSET) == 0) 1558 uio->uio_offset = fp->f_offset; 1559 1560 resid = uio->uio_resid; 1561 1562 if (dsw->d_flags & D_NEEDGIANT) 1563 mtx_lock(&Giant); 1564 error = dsw->d_write(dev, uio, ioflag); 1565 if (dsw->d_flags & D_NEEDGIANT) 1566 mtx_unlock(&Giant); 1567 dev_relthread(dev); 1568 if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1569 vfs_timestamp(&dev->si_ctime); 1570 dev->si_mtime = dev->si_ctime; 1571 } 1572 1573 if ((flags & FOF_OFFSET) == 0) 1574 fp->f_offset = uio->uio_offset; 1575 fp->f_nextoff = uio->uio_offset; 1576 return (error); 1577 } 1578 1579 static struct vnodeopv_entry_desc devfs_vnodeop_entries[] = { 1580 { &vop_default_desc, (vop_t *) vop_defaultop }, 1581 { &vop_access_desc, (vop_t *) devfs_access }, 1582 { &vop_getattr_desc, (vop_t *) devfs_getattr }, 1583 { &vop_ioctl_desc, (vop_t *) devfs_rioctl }, 1584 { &vop_lookup_desc, (vop_t *) devfs_lookup }, 1585 { &vop_mknod_desc, (vop_t *) devfs_mknod }, 1586 { &vop_pathconf_desc, (vop_t *) devfs_pathconf }, 1587 { &vop_read_desc, (vop_t *) devfs_rread }, 1588 { &vop_readdir_desc, (vop_t *) devfs_readdir }, 1589 { &vop_readlink_desc, (vop_t *) devfs_readlink }, 1590 { &vop_reclaim_desc, (vop_t *) devfs_reclaim }, 1591 { &vop_remove_desc, (vop_t *) devfs_remove }, 1592 { &vop_revoke_desc, (vop_t *) devfs_revoke }, 1593 { &vop_setattr_desc, (vop_t *) devfs_setattr }, 1594 #ifdef MAC 1595 { &vop_setlabel_desc, (vop_t *) devfs_setlabel }, 1596 #endif 1597 { &vop_symlink_desc, (vop_t *) devfs_symlink }, 1598 { NULL, NULL } 1599 }; 1600 1601 static struct vnodeopv_desc devfs_vnodeop_opv_desc = 1602 { &devfs_vnodeop_p, devfs_vnodeop_entries }; 1603 1604 VNODEOP_SET(devfs_vnodeop_opv_desc); 1605 1606 static struct vnodeopv_entry_desc devfs_specop_entries[] = { 1607 { &vop_default_desc, (vop_t *) vop_defaultop }, 1608 { &vop_access_desc, (vop_t *) devfs_access }, 1609 { &vop_advlock_desc, (vop_t *) devfs_advlock }, 1610 { &vop_bmap_desc, (vop_t *) vop_panic }, 1611 { &vop_close_desc, (vop_t *) devfs_close }, 1612 { &vop_create_desc, (vop_t *) vop_panic }, 1613 { &vop_fsync_desc, (vop_t *) devfs_fsync }, 1614 { &vop_getattr_desc, (vop_t *) devfs_getattr }, 1615 { &vop_ioctl_desc, (vop_t *) devfs_ioctl }, 1616 { &vop_kqfilter_desc, (vop_t *) devfs_kqfilter }, 1617 { &vop_lease_desc, (vop_t *) vop_null }, 1618 { &vop_link_desc, (vop_t *) vop_panic }, 1619 { &vop_mkdir_desc, (vop_t *) vop_panic }, 1620 { &vop_mknod_desc, (vop_t *) vop_panic }, 1621 { &vop_open_desc, (vop_t *) devfs_open }, 1622 { &vop_pathconf_desc, (vop_t *) devfs_pathconf }, 1623 { &vop_poll_desc, (vop_t *) devfs_poll }, 1624 { &vop_print_desc, (vop_t *) devfs_print }, 1625 { &vop_read_desc, (vop_t *) devfs_read }, 1626 { &vop_readdir_desc, (vop_t *) vop_panic }, 1627 { &vop_readlink_desc, (vop_t *) vop_panic }, 1628 { &vop_reallocblks_desc, (vop_t *) vop_panic }, 1629 { &vop_reclaim_desc, (vop_t *) devfs_reclaim }, 1630 { &vop_remove_desc, (vop_t *) devfs_remove }, 1631 { &vop_rename_desc, (vop_t *) vop_panic }, 1632 { &vop_revoke_desc, (vop_t *) devfs_revoke }, 1633 { &vop_rmdir_desc, (vop_t *) vop_panic }, 1634 { &vop_setattr_desc, (vop_t *) devfs_setattr }, 1635 #ifdef MAC 1636 { &vop_setlabel_desc, (vop_t *) devfs_setlabel }, 1637 #endif 1638 { &vop_strategy_desc, (vop_t *) vop_panic }, 1639 { &vop_symlink_desc, (vop_t *) vop_panic }, 1640 { &vop_write_desc, (vop_t *) devfs_write }, 1641 { NULL, NULL } 1642 }; 1643 1644 static struct vnodeopv_desc devfs_specop_opv_desc = 1645 { &devfs_specop_p, devfs_specop_entries }; 1646 1647 VNODEOP_SET(devfs_specop_opv_desc); 1648