vfs_syscalls.c revision 1.84
1 /* $NetBSD: vfs_syscalls.c,v 1.84 1997/04/11 22:03:58 kleink Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/namei.h> 46 #include <sys/filedesc.h> 47 #include <sys/kernel.h> 48 #include <sys/file.h> 49 #include <sys/stat.h> 50 #include <sys/vnode.h> 51 #include <sys/mount.h> 52 #include <sys/proc.h> 53 #include <sys/uio.h> 54 #include <sys/malloc.h> 55 #include <sys/dirent.h> 56 57 #include <sys/syscallargs.h> 58 59 #include <vm/vm.h> 60 #include <sys/sysctl.h> 61 62 static int change_dir __P((struct nameidata *, struct proc *)); 63 64 void checkdirs __P((struct vnode *)); 65 int dounmount __P((struct mount *, int, struct proc *)); 66 67 /* 68 * Virtual File System System Calls 69 */ 70 71 /* 72 * Mount a file system. 73 */ 74 /* ARGSUSED */ 75 int 76 sys_mount(p, v, retval) 77 struct proc *p; 78 void *v; 79 register_t *retval; 80 { 81 register struct sys_mount_args /* { 82 syscallarg(const char *) type; 83 syscallarg(const char *) path; 84 syscallarg(int) flags; 85 syscallarg(void *) data; 86 } */ *uap = v; 87 register struct vnode *vp; 88 register struct mount *mp; 89 int error, flag = 0; 90 u_long fsindex = 0; 91 char fstypename[MFSNAMELEN]; 92 struct vattr va; 93 struct nameidata nd; 94 95 /* 96 * Get vnode to be covered 97 */ 98 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 99 SCARG(uap, path), p); 100 if ((error = namei(&nd)) != 0) 101 return (error); 102 vp = nd.ni_vp; 103 if (SCARG(uap, flags) & MNT_UPDATE) { 104 if ((vp->v_flag & VROOT) == 0) { 105 vput(vp); 106 return (EINVAL); 107 } 108 mp = vp->v_mount; 109 flag = mp->mnt_flag; 110 /* 111 * We only allow the filesystem to be reloaded if it 112 * is currently mounted read-only. 113 */ 114 if ((SCARG(uap, flags) & MNT_RELOAD) && 115 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 116 vput(vp); 117 return (EOPNOTSUPP); /* Needs translation */ 118 } 119 mp->mnt_flag |= 120 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 121 /* 122 * Only root, or the user that did the original mount is 123 * permitted to update it. 124 */ 125 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 126 (error = suser(p->p_ucred, &p->p_acflag))) { 127 vput(vp); 128 return (error); 129 } 130 /* 131 * Do not allow NFS export by non-root users. Silently 132 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 133 */ 134 if (p->p_ucred->cr_uid != 0) { 135 if (SCARG(uap, flags) & MNT_EXPORTED) { 136 vput(vp); 137 return (EPERM); 138 } 139 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 140 } 141 VOP_UNLOCK(vp); 142 goto update; 143 } 144 /* 145 * If the user is not root, ensure that they own the directory 146 * onto which we are attempting to mount. 147 */ 148 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) || 149 (va.va_uid != p->p_ucred->cr_uid && 150 (error = suser(p->p_ucred, &p->p_acflag)))) { 151 vput(vp); 152 return (error); 153 } 154 /* 155 * Do not allow NFS export by non-root users. Silently 156 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 157 */ 158 if (p->p_ucred->cr_uid != 0) { 159 if (SCARG(uap, flags) & MNT_EXPORTED) { 160 vput(vp); 161 return (EPERM); 162 } 163 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 164 } 165 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 166 return (error); 167 if (vp->v_type != VDIR) { 168 vput(vp); 169 return (ENOTDIR); 170 } 171 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 172 if (error) { 173 #if defined(COMPAT_09) || defined(COMPAT_43) 174 /* 175 * Historically filesystem types were identified by number. 176 * If we get an integer for the filesystem type instead of a 177 * string, we check to see if it matches one of the historic 178 * filesystem types. 179 */ 180 fsindex = (u_long)SCARG(uap, type); 181 if (fsindex >= nvfssw || vfssw[fsindex] == NULL) { 182 vput(vp); 183 return (ENODEV); 184 } 185 strncpy(fstypename, vfssw[fsindex]->vfs_name, MFSNAMELEN); 186 #else 187 vput(vp); 188 return (error); 189 #endif 190 } 191 #ifdef COMPAT_10 192 /* Accept `ufs' as an alias for `ffs'. */ 193 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 194 strncpy(fstypename, "ffs", MFSNAMELEN); 195 #endif 196 for (fsindex = 0; fsindex < nvfssw; fsindex++) 197 if (vfssw[fsindex] != NULL && 198 !strncmp(vfssw[fsindex]->vfs_name, fstypename, MFSNAMELEN)) 199 break; 200 if (fsindex >= nvfssw) { 201 vput(vp); 202 return (ENODEV); 203 } 204 if (vp->v_mountedhere != NULL) { 205 vput(vp); 206 return (EBUSY); 207 } 208 209 /* 210 * Allocate and initialize the file system. 211 */ 212 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 213 M_MOUNT, M_WAITOK); 214 bzero((char *)mp, (u_long)sizeof(struct mount)); 215 mp->mnt_op = vfssw[fsindex]; 216 if ((error = vfs_lock(mp)) != 0) { 217 free((caddr_t)mp, M_MOUNT); 218 vput(vp); 219 return (error); 220 } 221 /* Do this early in case we block later. */ 222 vfssw[fsindex]->vfs_refcount++; 223 vp->v_mountedhere = mp; 224 mp->mnt_vnodecovered = vp; 225 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 226 update: 227 /* 228 * Set the mount level flags. 229 */ 230 if (SCARG(uap, flags) & MNT_RDONLY) 231 mp->mnt_flag |= MNT_RDONLY; 232 else if (mp->mnt_flag & MNT_RDONLY) 233 mp->mnt_flag |= MNT_WANTRDWR; 234 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 235 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 236 MNT_NOATIME); 237 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 238 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 239 MNT_NOCOREDUMP | MNT_NOATIME); 240 /* 241 * Mount the filesystem. 242 */ 243 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 244 if (mp->mnt_flag & MNT_UPDATE) { 245 vrele(vp); 246 if (mp->mnt_flag & MNT_WANTRDWR) 247 mp->mnt_flag &= ~MNT_RDONLY; 248 mp->mnt_flag &=~ 249 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 250 if (error) 251 mp->mnt_flag = flag; 252 return (error); 253 } 254 /* 255 * Put the new filesystem on the mount list after root. 256 */ 257 cache_purge(vp); 258 if (!error) { 259 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 260 checkdirs(vp); 261 VOP_UNLOCK(vp); 262 vfs_unlock(mp); 263 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 264 error = VFS_START(mp, 0, p); 265 } else { 266 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 267 vfssw[fsindex]->vfs_refcount--; 268 vfs_unlock(mp); 269 free((caddr_t)mp, M_MOUNT); 270 vput(vp); 271 } 272 return (error); 273 } 274 275 /* 276 * Scan all active processes to see if any of them have a current 277 * or root directory onto which the new filesystem has just been 278 * mounted. If so, replace them with the new mount point. 279 */ 280 void 281 checkdirs(olddp) 282 struct vnode *olddp; 283 { 284 struct filedesc *fdp; 285 struct vnode *newdp; 286 struct proc *p; 287 288 if (olddp->v_usecount == 1) 289 return; 290 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 291 panic("mount: lost mount"); 292 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 293 fdp = p->p_fd; 294 if (fdp->fd_cdir == olddp) { 295 vrele(fdp->fd_cdir); 296 VREF(newdp); 297 fdp->fd_cdir = newdp; 298 } 299 if (fdp->fd_rdir == olddp) { 300 vrele(fdp->fd_rdir); 301 VREF(newdp); 302 fdp->fd_rdir = newdp; 303 } 304 } 305 if (rootvnode == olddp) { 306 vrele(rootvnode); 307 VREF(newdp); 308 rootvnode = newdp; 309 } 310 vput(newdp); 311 } 312 313 /* 314 * Unmount a file system. 315 * 316 * Note: unmount takes a path to the vnode mounted on as argument, 317 * not special file (as before). 318 */ 319 /* ARGSUSED */ 320 int 321 sys_unmount(p, v, retval) 322 struct proc *p; 323 void *v; 324 register_t *retval; 325 { 326 register struct sys_unmount_args /* { 327 syscallarg(const char *) path; 328 syscallarg(int) flags; 329 } */ *uap = v; 330 register struct vnode *vp; 331 struct mount *mp; 332 int error; 333 struct nameidata nd; 334 335 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 336 SCARG(uap, path), p); 337 if ((error = namei(&nd)) != 0) 338 return (error); 339 vp = nd.ni_vp; 340 mp = vp->v_mount; 341 342 /* 343 * Only root, or the user that did the original mount is 344 * permitted to unmount this filesystem. 345 */ 346 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 347 (error = suser(p->p_ucred, &p->p_acflag))) { 348 vput(vp); 349 return (error); 350 } 351 352 /* 353 * Don't allow unmounting the root file system. 354 */ 355 if (mp->mnt_flag & MNT_ROOTFS) { 356 vput(vp); 357 return (EINVAL); 358 } 359 360 /* 361 * Must be the root of the filesystem 362 */ 363 if ((vp->v_flag & VROOT) == 0) { 364 vput(vp); 365 return (EINVAL); 366 } 367 vput(vp); 368 369 if (vfs_busy(mp)) 370 return (EBUSY); 371 372 return (dounmount(mp, SCARG(uap, flags), p)); 373 } 374 375 /* 376 * Do the actual file system unmount. File system is assumed to have been 377 * marked busy by the caller. 378 */ 379 int 380 dounmount(mp, flags, p) 381 register struct mount *mp; 382 int flags; 383 struct proc *p; 384 { 385 struct vnode *coveredvp; 386 int error; 387 388 coveredvp = mp->mnt_vnodecovered; 389 mp->mnt_flag |= MNT_UNMOUNT; 390 if ((error = vfs_lock(mp)) != 0) { 391 vfs_unbusy(mp); 392 return (error); 393 } 394 395 mp->mnt_flag &=~ MNT_ASYNC; 396 vnode_pager_umount(mp); /* release cached vnodes */ 397 cache_purgevfs(mp); /* remove cache entries for this file sys */ 398 if ((error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0 || 399 (flags & MNT_FORCE)) 400 error = VFS_UNMOUNT(mp, flags, p); 401 mp->mnt_flag &= ~MNT_UNMOUNT; 402 vfs_unbusy(mp); 403 if (error) { 404 vfs_unlock(mp); 405 } else { 406 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 407 if (coveredvp != NULLVP) { 408 vrele(coveredvp); 409 coveredvp->v_mountedhere = (struct mount *)0; 410 } 411 mp->mnt_op->vfs_refcount--; 412 vfs_unlock(mp); 413 if (mp->mnt_vnodelist.lh_first != NULL) 414 panic("unmount: dangling vnode"); 415 free((caddr_t)mp, M_MOUNT); 416 } 417 return (error); 418 } 419 420 /* 421 * Sync each mounted filesystem. 422 */ 423 #ifdef DEBUG 424 int syncprt = 0; 425 struct ctldebug debug0 = { "syncprt", &syncprt }; 426 #endif 427 428 /* ARGSUSED */ 429 int 430 sys_sync(p, v, retval) 431 struct proc *p; 432 void *v; 433 register_t *retval; 434 { 435 register struct mount *mp, *nmp; 436 int asyncflag; 437 438 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 439 /* 440 * Get the prev pointer in case we hang on vfs_busy 441 * while we are being unmounted. 442 */ 443 nmp = mp->mnt_list.cqe_prev; 444 /* 445 * The lock check below is to avoid races with mount 446 * and unmount. 447 */ 448 if ((mp->mnt_flag & (MNT_MLOCK|MNT_RDONLY|MNT_MPBUSY)) == 0 && 449 !vfs_busy(mp)) { 450 asyncflag = mp->mnt_flag & MNT_ASYNC; 451 mp->mnt_flag &= ~MNT_ASYNC; 452 vnode_pager_sync(mp); 453 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 454 if (asyncflag) 455 mp->mnt_flag |= MNT_ASYNC; 456 /* 457 * Get the prev pointer again, as the prior filesystem 458 * might have been unmounted while we were sync'ing. 459 */ 460 nmp = mp->mnt_list.cqe_prev; 461 vfs_unbusy(mp); 462 } 463 } 464 #ifdef DEBUG 465 if (syncprt) 466 vfs_bufstats(); 467 #endif /* DEBUG */ 468 return (0); 469 } 470 471 /* 472 * Change filesystem quotas. 473 */ 474 /* ARGSUSED */ 475 int 476 sys_quotactl(p, v, retval) 477 struct proc *p; 478 void *v; 479 register_t *retval; 480 { 481 register struct sys_quotactl_args /* { 482 syscallarg(const char *) path; 483 syscallarg(int) cmd; 484 syscallarg(int) uid; 485 syscallarg(caddr_t) arg; 486 } */ *uap = v; 487 register struct mount *mp; 488 int error; 489 struct nameidata nd; 490 491 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 492 if ((error = namei(&nd)) != 0) 493 return (error); 494 mp = nd.ni_vp->v_mount; 495 vrele(nd.ni_vp); 496 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 497 SCARG(uap, arg), p)); 498 } 499 500 /* 501 * Get filesystem statistics. 502 */ 503 /* ARGSUSED */ 504 int 505 sys_statfs(p, v, retval) 506 struct proc *p; 507 void *v; 508 register_t *retval; 509 { 510 register struct sys_statfs_args /* { 511 syscallarg(const char *) path; 512 syscallarg(struct statfs *) buf; 513 } */ *uap = v; 514 register struct mount *mp; 515 register struct statfs *sp; 516 int error; 517 struct nameidata nd; 518 519 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 520 if ((error = namei(&nd)) != 0) 521 return (error); 522 mp = nd.ni_vp->v_mount; 523 sp = &mp->mnt_stat; 524 vrele(nd.ni_vp); 525 if ((error = VFS_STATFS(mp, sp, p)) != 0) 526 return (error); 527 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 528 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 529 } 530 531 /* 532 * Get filesystem statistics. 533 */ 534 /* ARGSUSED */ 535 int 536 sys_fstatfs(p, v, retval) 537 struct proc *p; 538 void *v; 539 register_t *retval; 540 { 541 register struct sys_fstatfs_args /* { 542 syscallarg(int) fd; 543 syscallarg(struct statfs *) buf; 544 } */ *uap = v; 545 struct file *fp; 546 struct mount *mp; 547 register struct statfs *sp; 548 int error; 549 550 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 551 return (error); 552 mp = ((struct vnode *)fp->f_data)->v_mount; 553 sp = &mp->mnt_stat; 554 if ((error = VFS_STATFS(mp, sp, p)) != 0) 555 return (error); 556 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 557 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 558 } 559 560 /* 561 * Get statistics on all filesystems. 562 */ 563 int 564 sys_getfsstat(p, v, retval) 565 struct proc *p; 566 void *v; 567 register_t *retval; 568 { 569 register struct sys_getfsstat_args /* { 570 syscallarg(struct statfs *) buf; 571 syscallarg(long) bufsize; 572 syscallarg(int) flags; 573 } */ *uap = v; 574 register struct mount *mp, *nmp; 575 register struct statfs *sp; 576 caddr_t sfsp; 577 long count, maxcount, error; 578 579 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 580 sfsp = (caddr_t)SCARG(uap, buf); 581 for (count = 0, 582 mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 583 nmp = mp->mnt_list.cqe_next; 584 if (sfsp && count < maxcount && 585 ((mp->mnt_flag & MNT_MLOCK) == 0)) { 586 sp = &mp->mnt_stat; 587 /* 588 * If MNT_NOWAIT is specified, do not refresh the 589 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 590 */ 591 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 592 (SCARG(uap, flags) & MNT_WAIT)) && 593 (error = VFS_STATFS(mp, sp, p))) 594 continue; 595 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 596 error = copyout(sp, sfsp, sizeof(*sp)); 597 if (error) 598 return (error); 599 sfsp += sizeof(*sp); 600 } 601 count++; 602 } 603 if (sfsp && count > maxcount) 604 *retval = maxcount; 605 else 606 *retval = count; 607 return (0); 608 } 609 610 /* 611 * Change current working directory to a given file descriptor. 612 */ 613 /* ARGSUSED */ 614 int 615 sys_fchdir(p, v, retval) 616 struct proc *p; 617 void *v; 618 register_t *retval; 619 { 620 struct sys_fchdir_args /* { 621 syscallarg(int) fd; 622 } */ *uap = v; 623 register struct filedesc *fdp = p->p_fd; 624 struct vnode *vp, *tdp; 625 struct mount *mp; 626 struct file *fp; 627 int error; 628 629 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 630 return (error); 631 vp = (struct vnode *)fp->f_data; 632 VREF(vp); 633 VOP_LOCK(vp); 634 if (vp->v_type != VDIR) 635 error = ENOTDIR; 636 else 637 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 638 while (!error && (mp = vp->v_mountedhere) != NULL) { 639 if (mp->mnt_flag & MNT_MLOCK) { 640 mp->mnt_flag |= MNT_MWAIT; 641 sleep((caddr_t)mp, PVFS); 642 continue; 643 } 644 if ((error = VFS_ROOT(mp, &tdp)) != 0) 645 break; 646 vput(vp); 647 vp = tdp; 648 } 649 VOP_UNLOCK(vp); 650 if (error) { 651 vrele(vp); 652 return (error); 653 } 654 vrele(fdp->fd_cdir); 655 fdp->fd_cdir = vp; 656 return (0); 657 } 658 659 /* 660 * Change current working directory (``.''). 661 */ 662 /* ARGSUSED */ 663 int 664 sys_chdir(p, v, retval) 665 struct proc *p; 666 void *v; 667 register_t *retval; 668 { 669 struct sys_chdir_args /* { 670 syscallarg(const char *) path; 671 } */ *uap = v; 672 register struct filedesc *fdp = p->p_fd; 673 int error; 674 struct nameidata nd; 675 676 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 677 SCARG(uap, path), p); 678 if ((error = change_dir(&nd, p)) != 0) 679 return (error); 680 vrele(fdp->fd_cdir); 681 fdp->fd_cdir = nd.ni_vp; 682 return (0); 683 } 684 685 /* 686 * Change notion of root (``/'') directory. 687 */ 688 /* ARGSUSED */ 689 int 690 sys_chroot(p, v, retval) 691 struct proc *p; 692 void *v; 693 register_t *retval; 694 { 695 struct sys_chroot_args /* { 696 syscallarg(const char *) path; 697 } */ *uap = v; 698 register struct filedesc *fdp = p->p_fd; 699 int error; 700 struct nameidata nd; 701 702 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 703 return (error); 704 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 705 SCARG(uap, path), p); 706 if ((error = change_dir(&nd, p)) != 0) 707 return (error); 708 if (fdp->fd_rdir != NULL) 709 vrele(fdp->fd_rdir); 710 fdp->fd_rdir = nd.ni_vp; 711 return (0); 712 } 713 714 /* 715 * Common routine for chroot and chdir. 716 */ 717 static int 718 change_dir(ndp, p) 719 register struct nameidata *ndp; 720 struct proc *p; 721 { 722 struct vnode *vp; 723 int error; 724 725 if ((error = namei(ndp)) != 0) 726 return (error); 727 vp = ndp->ni_vp; 728 if (vp->v_type != VDIR) 729 error = ENOTDIR; 730 else 731 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 732 VOP_UNLOCK(vp); 733 if (error) 734 vrele(vp); 735 return (error); 736 } 737 738 /* 739 * Check permissions, allocate an open file structure, 740 * and call the device open routine if any. 741 */ 742 int 743 sys_open(p, v, retval) 744 struct proc *p; 745 void *v; 746 register_t *retval; 747 { 748 register struct sys_open_args /* { 749 syscallarg(const char *) path; 750 syscallarg(int) flags; 751 syscallarg(int) mode; 752 } */ *uap = v; 753 register struct filedesc *fdp = p->p_fd; 754 register struct file *fp; 755 register struct vnode *vp; 756 int flags, cmode; 757 struct file *nfp; 758 int type, indx, error; 759 struct flock lf; 760 struct nameidata nd; 761 extern struct fileops vnops; 762 763 if ((error = falloc(p, &nfp, &indx)) != 0) 764 return (error); 765 fp = nfp; 766 flags = FFLAGS(SCARG(uap, flags)); 767 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 768 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 769 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 770 if ((error = vn_open(&nd, flags, cmode)) != 0) { 771 ffree(fp); 772 if ((error == ENODEV || error == ENXIO) && 773 p->p_dupfd >= 0 && /* XXX from fdopen */ 774 (error = 775 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 776 *retval = indx; 777 return (0); 778 } 779 if (error == ERESTART) 780 error = EINTR; 781 fdp->fd_ofiles[indx] = NULL; 782 return (error); 783 } 784 p->p_dupfd = 0; 785 vp = nd.ni_vp; 786 fp->f_flag = flags & FMASK; 787 fp->f_type = DTYPE_VNODE; 788 fp->f_ops = &vnops; 789 fp->f_data = (caddr_t)vp; 790 if (flags & (O_EXLOCK | O_SHLOCK)) { 791 lf.l_whence = SEEK_SET; 792 lf.l_start = 0; 793 lf.l_len = 0; 794 if (flags & O_EXLOCK) 795 lf.l_type = F_WRLCK; 796 else 797 lf.l_type = F_RDLCK; 798 type = F_FLOCK; 799 if ((flags & FNONBLOCK) == 0) 800 type |= F_WAIT; 801 VOP_UNLOCK(vp); 802 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 803 if (error) { 804 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 805 ffree(fp); 806 fdp->fd_ofiles[indx] = NULL; 807 return (error); 808 } 809 VOP_LOCK(vp); 810 fp->f_flag |= FHASLOCK; 811 } 812 VOP_UNLOCK(vp); 813 *retval = indx; 814 return (0); 815 } 816 817 /* 818 * Create a special file. 819 */ 820 /* ARGSUSED */ 821 int 822 sys_mknod(p, v, retval) 823 struct proc *p; 824 void *v; 825 register_t *retval; 826 { 827 register struct sys_mknod_args /* { 828 syscallarg(const char *) path; 829 syscallarg(int) mode; 830 syscallarg(int) dev; 831 } */ *uap = v; 832 register struct vnode *vp; 833 struct vattr vattr; 834 int error; 835 int whiteout = 0; 836 struct nameidata nd; 837 838 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 839 return (error); 840 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 841 if ((error = namei(&nd)) != 0) 842 return (error); 843 vp = nd.ni_vp; 844 if (vp != NULL) 845 error = EEXIST; 846 else { 847 VATTR_NULL(&vattr); 848 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 849 vattr.va_rdev = SCARG(uap, dev); 850 whiteout = 0; 851 852 switch (SCARG(uap, mode) & S_IFMT) { 853 case S_IFMT: /* used by badsect to flag bad sectors */ 854 vattr.va_type = VBAD; 855 break; 856 case S_IFCHR: 857 vattr.va_type = VCHR; 858 break; 859 case S_IFBLK: 860 vattr.va_type = VBLK; 861 break; 862 case S_IFWHT: 863 whiteout = 1; 864 break; 865 default: 866 error = EINVAL; 867 break; 868 } 869 } 870 if (!error) { 871 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 872 if (whiteout) { 873 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 874 if (error) 875 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 876 vput(nd.ni_dvp); 877 } else { 878 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 879 &nd.ni_cnd, &vattr); 880 } 881 } else { 882 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 883 if (nd.ni_dvp == vp) 884 vrele(nd.ni_dvp); 885 else 886 vput(nd.ni_dvp); 887 if (vp) 888 vrele(vp); 889 } 890 return (error); 891 } 892 893 /* 894 * Create a named pipe. 895 */ 896 /* ARGSUSED */ 897 int 898 sys_mkfifo(p, v, retval) 899 struct proc *p; 900 void *v; 901 register_t *retval; 902 { 903 #ifndef FIFO 904 return (EOPNOTSUPP); 905 #else 906 register struct sys_mkfifo_args /* { 907 syscallarg(const char *) path; 908 syscallarg(int) mode; 909 } */ *uap = v; 910 struct vattr vattr; 911 int error; 912 struct nameidata nd; 913 914 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 915 if ((error = namei(&nd)) != 0) 916 return (error); 917 if (nd.ni_vp != NULL) { 918 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 919 if (nd.ni_dvp == nd.ni_vp) 920 vrele(nd.ni_dvp); 921 else 922 vput(nd.ni_dvp); 923 vrele(nd.ni_vp); 924 return (EEXIST); 925 } 926 VATTR_NULL(&vattr); 927 vattr.va_type = VFIFO; 928 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 929 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 930 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 931 #endif /* FIFO */ 932 } 933 934 /* 935 * Make a hard file link. 936 */ 937 /* ARGSUSED */ 938 int 939 sys_link(p, v, retval) 940 struct proc *p; 941 void *v; 942 register_t *retval; 943 { 944 register struct sys_link_args /* { 945 syscallarg(const char *) path; 946 syscallarg(const char *) link; 947 } */ *uap = v; 948 register struct vnode *vp; 949 struct nameidata nd; 950 int error; 951 952 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 953 if ((error = namei(&nd)) != 0) 954 return (error); 955 vp = nd.ni_vp; 956 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 957 if ((error = namei(&nd)) != 0) 958 goto out; 959 if (nd.ni_vp) { 960 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 961 if (nd.ni_dvp == nd.ni_vp) 962 vrele(nd.ni_dvp); 963 else 964 vput(nd.ni_dvp); 965 vrele(nd.ni_vp); 966 error = EEXIST; 967 goto out; 968 } 969 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 970 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 971 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 972 out: 973 vrele(vp); 974 return (error); 975 } 976 977 /* 978 * Make a symbolic link. 979 */ 980 /* ARGSUSED */ 981 int 982 sys_symlink(p, v, retval) 983 struct proc *p; 984 void *v; 985 register_t *retval; 986 { 987 register struct sys_symlink_args /* { 988 syscallarg(const char *) path; 989 syscallarg(const char *) link; 990 } */ *uap = v; 991 struct vattr vattr; 992 char *path; 993 int error; 994 struct nameidata nd; 995 996 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 997 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 998 if (error) 999 goto out; 1000 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1001 if ((error = namei(&nd)) != 0) 1002 goto out; 1003 if (nd.ni_vp) { 1004 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1005 if (nd.ni_dvp == nd.ni_vp) 1006 vrele(nd.ni_dvp); 1007 else 1008 vput(nd.ni_dvp); 1009 vrele(nd.ni_vp); 1010 error = EEXIST; 1011 goto out; 1012 } 1013 VATTR_NULL(&vattr); 1014 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1015 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1016 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1017 out: 1018 FREE(path, M_NAMEI); 1019 return (error); 1020 } 1021 1022 /* 1023 * Delete a whiteout from the filesystem. 1024 */ 1025 /* ARGSUSED */ 1026 int 1027 sys_undelete(p, v, retval) 1028 struct proc *p; 1029 void *v; 1030 register_t *retval; 1031 { 1032 register struct sys_undelete_args /* { 1033 syscallarg(const char *) path; 1034 } */ *uap = v; 1035 int error; 1036 struct nameidata nd; 1037 1038 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1039 SCARG(uap, path), p); 1040 error = namei(&nd); 1041 if (error) 1042 return (error); 1043 1044 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1045 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1046 if (nd.ni_dvp == nd.ni_vp) 1047 vrele(nd.ni_dvp); 1048 else 1049 vput(nd.ni_dvp); 1050 if (nd.ni_vp) 1051 vrele(nd.ni_vp); 1052 return (EEXIST); 1053 } 1054 1055 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1056 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1057 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1058 vput(nd.ni_dvp); 1059 return (error); 1060 } 1061 1062 /* 1063 * Delete a name from the filesystem. 1064 */ 1065 /* ARGSUSED */ 1066 int 1067 sys_unlink(p, v, retval) 1068 struct proc *p; 1069 void *v; 1070 register_t *retval; 1071 { 1072 struct sys_unlink_args /* { 1073 syscallarg(const char *) path; 1074 } */ *uap = v; 1075 register struct vnode *vp; 1076 int error; 1077 struct nameidata nd; 1078 1079 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1080 SCARG(uap, path), p); 1081 if ((error = namei(&nd)) != 0) 1082 return (error); 1083 vp = nd.ni_vp; 1084 1085 /* 1086 * The root of a mounted filesystem cannot be deleted. 1087 */ 1088 if (vp->v_flag & VROOT) { 1089 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1090 if (nd.ni_dvp == vp) 1091 vrele(nd.ni_dvp); 1092 else 1093 vput(nd.ni_dvp); 1094 vput(vp); 1095 error = EBUSY; 1096 goto out; 1097 } 1098 1099 (void)vnode_pager_uncache(vp); 1100 1101 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1102 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1103 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1104 out: 1105 return (error); 1106 } 1107 1108 /* 1109 * Reposition read/write file offset. 1110 */ 1111 int 1112 sys_lseek(p, v, retval) 1113 struct proc *p; 1114 void *v; 1115 register_t *retval; 1116 { 1117 register struct sys_lseek_args /* { 1118 syscallarg(int) fd; 1119 syscallarg(int) pad; 1120 syscallarg(off_t) offset; 1121 syscallarg(int) whence; 1122 } */ *uap = v; 1123 struct ucred *cred = p->p_ucred; 1124 register struct filedesc *fdp = p->p_fd; 1125 register struct file *fp; 1126 struct vnode *vp; 1127 struct vattr vattr; 1128 register off_t newoff; 1129 int error; 1130 1131 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1132 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1133 return (EBADF); 1134 1135 vp = (struct vnode *)fp->f_data; 1136 if (fp->f_type != DTYPE_VNODE 1137 #ifdef FIFO 1138 || vp->v_type == VFIFO 1139 #endif 1140 ) 1141 return (ESPIPE); 1142 1143 switch (SCARG(uap, whence)) { 1144 case L_INCR: 1145 newoff = fp->f_offset + SCARG(uap, offset); 1146 break; 1147 case L_XTND: 1148 error = VOP_GETATTR((struct vnode *)fp->f_data, &vattr, 1149 cred, p); 1150 if (error) 1151 return (error); 1152 newoff = SCARG(uap, offset) + vattr.va_size; 1153 break; 1154 case L_SET: 1155 newoff = SCARG(uap, offset); 1156 break; 1157 default: 1158 return (EINVAL); 1159 } 1160 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1161 return (error); 1162 1163 *(off_t *)retval = fp->f_offset = newoff; 1164 return (0); 1165 } 1166 1167 /* 1168 * Check access permissions. 1169 */ 1170 int 1171 sys_access(p, v, retval) 1172 struct proc *p; 1173 void *v; 1174 register_t *retval; 1175 { 1176 register struct sys_access_args /* { 1177 syscallarg(const char *) path; 1178 syscallarg(int) flags; 1179 } */ *uap = v; 1180 register struct ucred *cred = p->p_ucred; 1181 register struct vnode *vp; 1182 int error, flags, t_gid, t_uid; 1183 struct nameidata nd; 1184 1185 t_uid = cred->cr_uid; 1186 t_gid = cred->cr_gid; 1187 cred->cr_uid = p->p_cred->p_ruid; 1188 cred->cr_gid = p->p_cred->p_rgid; 1189 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1190 SCARG(uap, path), p); 1191 if ((error = namei(&nd)) != 0) 1192 goto out1; 1193 vp = nd.ni_vp; 1194 1195 /* Flags == 0 means only check for existence. */ 1196 if (SCARG(uap, flags)) { 1197 flags = 0; 1198 if (SCARG(uap, flags) & R_OK) 1199 flags |= VREAD; 1200 if (SCARG(uap, flags) & W_OK) 1201 flags |= VWRITE; 1202 if (SCARG(uap, flags) & X_OK) 1203 flags |= VEXEC; 1204 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1205 error = VOP_ACCESS(vp, flags, cred, p); 1206 } 1207 vput(vp); 1208 out1: 1209 cred->cr_uid = t_uid; 1210 cred->cr_gid = t_gid; 1211 return (error); 1212 } 1213 1214 /* 1215 * Get file status; this version follows links. 1216 */ 1217 /* ARGSUSED */ 1218 int 1219 sys_stat(p, v, retval) 1220 struct proc *p; 1221 void *v; 1222 register_t *retval; 1223 { 1224 register struct sys_stat_args /* { 1225 syscallarg(const char *) path; 1226 syscallarg(struct stat *) ub; 1227 } */ *uap = v; 1228 struct stat sb; 1229 int error; 1230 struct nameidata nd; 1231 1232 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1233 SCARG(uap, path), p); 1234 if ((error = namei(&nd)) != 0) 1235 return (error); 1236 error = vn_stat(nd.ni_vp, &sb, p); 1237 vput(nd.ni_vp); 1238 if (error) 1239 return (error); 1240 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1241 return (error); 1242 } 1243 1244 /* 1245 * Get file status; this version does not follow links. 1246 */ 1247 /* ARGSUSED */ 1248 int 1249 sys_lstat(p, v, retval) 1250 struct proc *p; 1251 void *v; 1252 register_t *retval; 1253 { 1254 register struct sys_lstat_args /* { 1255 syscallarg(const char *) path; 1256 syscallarg(struct stat *) ub; 1257 } */ *uap = v; 1258 struct stat sb; 1259 int error; 1260 struct nameidata nd; 1261 1262 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1263 SCARG(uap, path), p); 1264 if ((error = namei(&nd)) != 0) 1265 return (error); 1266 error = vn_stat(nd.ni_vp, &sb, p); 1267 vput(nd.ni_vp); 1268 if (error) 1269 return (error); 1270 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1271 return (error); 1272 } 1273 1274 /* 1275 * Get configurable pathname variables. 1276 */ 1277 /* ARGSUSED */ 1278 int 1279 sys_pathconf(p, v, retval) 1280 struct proc *p; 1281 void *v; 1282 register_t *retval; 1283 { 1284 register struct sys_pathconf_args /* { 1285 syscallarg(const char *) path; 1286 syscallarg(int) name; 1287 } */ *uap = v; 1288 int error; 1289 struct nameidata nd; 1290 1291 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1292 SCARG(uap, path), p); 1293 if ((error = namei(&nd)) != 0) 1294 return (error); 1295 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1296 vput(nd.ni_vp); 1297 return (error); 1298 } 1299 1300 /* 1301 * Return target name of a symbolic link. 1302 */ 1303 /* ARGSUSED */ 1304 int 1305 sys_readlink(p, v, retval) 1306 struct proc *p; 1307 void *v; 1308 register_t *retval; 1309 { 1310 register struct sys_readlink_args /* { 1311 syscallarg(const char *) path; 1312 syscallarg(char *) buf; 1313 syscallarg(int) count; 1314 } */ *uap = v; 1315 register struct vnode *vp; 1316 struct iovec aiov; 1317 struct uio auio; 1318 int error; 1319 struct nameidata nd; 1320 1321 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1322 SCARG(uap, path), p); 1323 if ((error = namei(&nd)) != 0) 1324 return (error); 1325 vp = nd.ni_vp; 1326 if (vp->v_type != VLNK) 1327 error = EINVAL; 1328 else { 1329 aiov.iov_base = SCARG(uap, buf); 1330 aiov.iov_len = SCARG(uap, count); 1331 auio.uio_iov = &aiov; 1332 auio.uio_iovcnt = 1; 1333 auio.uio_offset = 0; 1334 auio.uio_rw = UIO_READ; 1335 auio.uio_segflg = UIO_USERSPACE; 1336 auio.uio_procp = p; 1337 auio.uio_resid = SCARG(uap, count); 1338 error = VOP_READLINK(vp, &auio, p->p_ucred); 1339 } 1340 vput(vp); 1341 *retval = SCARG(uap, count) - auio.uio_resid; 1342 return (error); 1343 } 1344 1345 /* 1346 * Change flags of a file given a path name. 1347 */ 1348 /* ARGSUSED */ 1349 int 1350 sys_chflags(p, v, retval) 1351 struct proc *p; 1352 void *v; 1353 register_t *retval; 1354 { 1355 register struct sys_chflags_args /* { 1356 syscallarg(const char *) path; 1357 syscallarg(u_long) flags; 1358 } */ *uap = v; 1359 register struct vnode *vp; 1360 struct vattr vattr; 1361 int error; 1362 struct nameidata nd; 1363 1364 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1365 if ((error = namei(&nd)) != 0) 1366 return (error); 1367 vp = nd.ni_vp; 1368 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1369 VOP_LOCK(vp); 1370 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1371 error = EROFS; 1372 else { 1373 VATTR_NULL(&vattr); 1374 vattr.va_flags = SCARG(uap, flags); 1375 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1376 } 1377 vput(vp); 1378 return (error); 1379 } 1380 1381 /* 1382 * Change flags of a file given a file descriptor. 1383 */ 1384 /* ARGSUSED */ 1385 int 1386 sys_fchflags(p, v, retval) 1387 struct proc *p; 1388 void *v; 1389 register_t *retval; 1390 { 1391 register struct sys_fchflags_args /* { 1392 syscallarg(int) fd; 1393 syscallarg(u_long) flags; 1394 } */ *uap = v; 1395 struct vattr vattr; 1396 struct vnode *vp; 1397 struct file *fp; 1398 int error; 1399 1400 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1401 return (error); 1402 vp = (struct vnode *)fp->f_data; 1403 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1404 VOP_LOCK(vp); 1405 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1406 error = EROFS; 1407 else { 1408 VATTR_NULL(&vattr); 1409 vattr.va_flags = SCARG(uap, flags); 1410 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1411 } 1412 VOP_UNLOCK(vp); 1413 return (error); 1414 } 1415 1416 /* 1417 * Change mode of a file given path name. 1418 */ 1419 /* ARGSUSED */ 1420 int 1421 sys_chmod(p, v, retval) 1422 struct proc *p; 1423 void *v; 1424 register_t *retval; 1425 { 1426 register struct sys_chmod_args /* { 1427 syscallarg(const char *) path; 1428 syscallarg(int) mode; 1429 } */ *uap = v; 1430 register struct vnode *vp; 1431 struct vattr vattr; 1432 int error; 1433 struct nameidata nd; 1434 1435 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1436 if ((error = namei(&nd)) != 0) 1437 return (error); 1438 vp = nd.ni_vp; 1439 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1440 VOP_LOCK(vp); 1441 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1442 error = EROFS; 1443 else { 1444 VATTR_NULL(&vattr); 1445 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1446 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1447 } 1448 vput(vp); 1449 return (error); 1450 } 1451 1452 /* 1453 * Change mode of a file given a file descriptor. 1454 */ 1455 /* ARGSUSED */ 1456 int 1457 sys_fchmod(p, v, retval) 1458 struct proc *p; 1459 void *v; 1460 register_t *retval; 1461 { 1462 register struct sys_fchmod_args /* { 1463 syscallarg(int) fd; 1464 syscallarg(int) mode; 1465 } */ *uap = v; 1466 struct vattr vattr; 1467 struct vnode *vp; 1468 struct file *fp; 1469 int error; 1470 1471 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1472 return (error); 1473 vp = (struct vnode *)fp->f_data; 1474 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1475 VOP_LOCK(vp); 1476 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1477 error = EROFS; 1478 else { 1479 VATTR_NULL(&vattr); 1480 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1481 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1482 } 1483 VOP_UNLOCK(vp); 1484 return (error); 1485 } 1486 1487 /* 1488 * Set ownership given a path name. 1489 */ 1490 /* ARGSUSED */ 1491 int 1492 sys_chown(p, v, retval) 1493 struct proc *p; 1494 void *v; 1495 register_t *retval; 1496 { 1497 register struct sys_chown_args /* { 1498 syscallarg(const char *) path; 1499 syscallarg(uid_t) uid; 1500 syscallarg(gid_t) gid; 1501 } */ *uap = v; 1502 register struct vnode *vp; 1503 struct vattr vattr; 1504 int error; 1505 struct nameidata nd; 1506 1507 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1508 if ((error = namei(&nd)) != 0) 1509 return (error); 1510 vp = nd.ni_vp; 1511 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1512 VOP_LOCK(vp); 1513 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1514 error = EROFS; 1515 else { 1516 VATTR_NULL(&vattr); 1517 vattr.va_uid = SCARG(uap, uid); 1518 vattr.va_gid = SCARG(uap, gid); 1519 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1520 } 1521 vput(vp); 1522 return (error); 1523 } 1524 1525 /* 1526 * Set ownership given a file descriptor. 1527 */ 1528 /* ARGSUSED */ 1529 int 1530 sys_fchown(p, v, retval) 1531 struct proc *p; 1532 void *v; 1533 register_t *retval; 1534 { 1535 register struct sys_fchown_args /* { 1536 syscallarg(int) fd; 1537 syscallarg(uid_t) uid; 1538 syscallarg(gid_t) gid; 1539 } */ *uap = v; 1540 register struct vnode *vp; 1541 struct vattr vattr; 1542 int error; 1543 struct file *fp; 1544 1545 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1546 return (error); 1547 vp = (struct vnode *)fp->f_data; 1548 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1549 VOP_LOCK(vp); 1550 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1551 error = EROFS; 1552 else { 1553 VATTR_NULL(&vattr); 1554 vattr.va_uid = SCARG(uap, uid); 1555 vattr.va_gid = SCARG(uap, gid); 1556 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1557 } 1558 VOP_UNLOCK(vp); 1559 return (error); 1560 } 1561 1562 /* 1563 * Set the access and modification times given a path name. 1564 */ 1565 /* ARGSUSED */ 1566 int 1567 sys_utimes(p, v, retval) 1568 struct proc *p; 1569 void *v; 1570 register_t *retval; 1571 { 1572 register struct sys_utimes_args /* { 1573 syscallarg(const char *) path; 1574 syscallarg(const struct timeval *) tptr; 1575 } */ *uap = v; 1576 register struct vnode *vp; 1577 struct timeval tv[2]; 1578 struct vattr vattr; 1579 int error; 1580 struct nameidata nd; 1581 1582 VATTR_NULL(&vattr); 1583 if (SCARG(uap, tptr) == NULL) { 1584 microtime(&tv[0]); 1585 tv[1] = tv[0]; 1586 vattr.va_vaflags |= VA_UTIMES_NULL; 1587 } else { 1588 error = copyin(SCARG(uap, tptr), tv, sizeof (tv)); 1589 if (error) 1590 return (error); 1591 } 1592 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1593 if ((error = namei(&nd)) != 0) 1594 return (error); 1595 vp = nd.ni_vp; 1596 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1597 VOP_LOCK(vp); 1598 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1599 error = EROFS; 1600 else { 1601 vattr.va_atime.tv_sec = tv[0].tv_sec; 1602 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1603 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1604 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1605 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1606 } 1607 vput(vp); 1608 return (error); 1609 } 1610 1611 /* 1612 * Set the access and modification times given a file descriptor. 1613 */ 1614 /* ARGSUSED */ 1615 int 1616 sys_futimes(p, v, retval) 1617 struct proc *p; 1618 void *v; 1619 register_t *retval; 1620 { 1621 register struct sys_futimes_args /* { 1622 syscallarg(int) fd; 1623 syscallarg(const struct timeval *) tptr; 1624 } */ *uap = v; 1625 register struct vnode *vp; 1626 struct timeval tv[2]; 1627 struct vattr vattr; 1628 int error; 1629 struct file *fp; 1630 1631 VATTR_NULL(&vattr); 1632 if (SCARG(uap, tptr) == NULL) { 1633 microtime(&tv[0]); 1634 tv[1] = tv[0]; 1635 vattr.va_vaflags |= VA_UTIMES_NULL; 1636 } else { 1637 error = copyin(SCARG(uap, tptr), tv, sizeof (tv)); 1638 if (error) 1639 return (error); 1640 } 1641 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1642 return (error); 1643 vp = (struct vnode *)fp->f_data; 1644 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1645 VOP_LOCK(vp); 1646 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1647 error = EROFS; 1648 else { 1649 vattr.va_atime.tv_sec = tv[0].tv_sec; 1650 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1651 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1652 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1653 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1654 } 1655 VOP_UNLOCK(vp); 1656 return (error); 1657 } 1658 1659 /* 1660 * Truncate a file given its path name. 1661 */ 1662 /* ARGSUSED */ 1663 int 1664 sys_truncate(p, v, retval) 1665 struct proc *p; 1666 void *v; 1667 register_t *retval; 1668 { 1669 register struct sys_truncate_args /* { 1670 syscallarg(const char *) path; 1671 syscallarg(int) pad; 1672 syscallarg(off_t) length; 1673 } */ *uap = v; 1674 register struct vnode *vp; 1675 struct vattr vattr; 1676 int error; 1677 struct nameidata nd; 1678 1679 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1680 if ((error = namei(&nd)) != 0) 1681 return (error); 1682 vp = nd.ni_vp; 1683 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1684 VOP_LOCK(vp); 1685 if (vp->v_type == VDIR) 1686 error = EISDIR; 1687 else if ((error = vn_writechk(vp)) == 0 && 1688 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1689 VATTR_NULL(&vattr); 1690 vattr.va_size = SCARG(uap, length); 1691 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1692 } 1693 vput(vp); 1694 return (error); 1695 } 1696 1697 /* 1698 * Truncate a file given a file descriptor. 1699 */ 1700 /* ARGSUSED */ 1701 int 1702 sys_ftruncate(p, v, retval) 1703 struct proc *p; 1704 void *v; 1705 register_t *retval; 1706 { 1707 register struct sys_ftruncate_args /* { 1708 syscallarg(int) fd; 1709 syscallarg(int) pad; 1710 syscallarg(off_t) length; 1711 } */ *uap = v; 1712 struct vattr vattr; 1713 struct vnode *vp; 1714 struct file *fp; 1715 int error; 1716 1717 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1718 return (error); 1719 if ((fp->f_flag & FWRITE) == 0) 1720 return (EINVAL); 1721 vp = (struct vnode *)fp->f_data; 1722 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1723 VOP_LOCK(vp); 1724 if (vp->v_type == VDIR) 1725 error = EISDIR; 1726 else if ((error = vn_writechk(vp)) == 0) { 1727 VATTR_NULL(&vattr); 1728 vattr.va_size = SCARG(uap, length); 1729 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1730 } 1731 VOP_UNLOCK(vp); 1732 return (error); 1733 } 1734 1735 /* 1736 * Sync an open file. 1737 */ 1738 /* ARGSUSED */ 1739 int 1740 sys_fsync(p, v, retval) 1741 struct proc *p; 1742 void *v; 1743 register_t *retval; 1744 { 1745 struct sys_fsync_args /* { 1746 syscallarg(int) fd; 1747 } */ *uap = v; 1748 register struct vnode *vp; 1749 struct file *fp; 1750 int error; 1751 1752 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1753 return (error); 1754 vp = (struct vnode *)fp->f_data; 1755 VOP_LOCK(vp); 1756 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p); 1757 VOP_UNLOCK(vp); 1758 return (error); 1759 } 1760 1761 /* 1762 * Rename files. Source and destination must either both be directories, 1763 * or both not be directories. If target is a directory, it must be empty. 1764 */ 1765 /* ARGSUSED */ 1766 int 1767 sys_rename(p, v, retval) 1768 struct proc *p; 1769 void *v; 1770 register_t *retval; 1771 { 1772 register struct sys_rename_args /* { 1773 syscallarg(const char *) from; 1774 syscallarg(const char *) to; 1775 } */ *uap = v; 1776 register struct vnode *tvp, *fvp, *tdvp; 1777 struct nameidata fromnd, tond; 1778 int error; 1779 1780 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 1781 SCARG(uap, from), p); 1782 if ((error = namei(&fromnd)) != 0) 1783 return (error); 1784 fvp = fromnd.ni_vp; 1785 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 1786 UIO_USERSPACE, SCARG(uap, to), p); 1787 if ((error = namei(&tond)) != 0) { 1788 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1789 vrele(fromnd.ni_dvp); 1790 vrele(fvp); 1791 goto out1; 1792 } 1793 tdvp = tond.ni_dvp; 1794 tvp = tond.ni_vp; 1795 if (tvp != NULL) { 1796 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 1797 error = ENOTDIR; 1798 goto out; 1799 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 1800 error = EISDIR; 1801 goto out; 1802 } 1803 } 1804 if (fvp == tdvp) 1805 error = EINVAL; 1806 /* 1807 * If source is the same as the destination (that is the 1808 * same inode number with the same name in the same directory), 1809 * then there is nothing to do. 1810 */ 1811 if (fvp == tvp && fromnd.ni_dvp == tdvp && 1812 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 1813 !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, 1814 fromnd.ni_cnd.cn_namelen)) 1815 error = -1; 1816 out: 1817 if (!error) { 1818 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 1819 if (fromnd.ni_dvp != tdvp) 1820 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1821 if (tvp) { 1822 (void)vnode_pager_uncache(tvp); 1823 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 1824 } 1825 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 1826 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 1827 } else { 1828 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 1829 if (tdvp == tvp) 1830 vrele(tdvp); 1831 else 1832 vput(tdvp); 1833 if (tvp) 1834 vput(tvp); 1835 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1836 vrele(fromnd.ni_dvp); 1837 vrele(fvp); 1838 } 1839 vrele(tond.ni_startdir); 1840 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 1841 out1: 1842 if (fromnd.ni_startdir) 1843 vrele(fromnd.ni_startdir); 1844 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 1845 return (error == -1 ? 0 : error); 1846 } 1847 1848 /* 1849 * Make a directory file. 1850 */ 1851 /* ARGSUSED */ 1852 int 1853 sys_mkdir(p, v, retval) 1854 struct proc *p; 1855 void *v; 1856 register_t *retval; 1857 { 1858 register struct sys_mkdir_args /* { 1859 syscallarg(const char *) path; 1860 syscallarg(int) mode; 1861 } */ *uap = v; 1862 register struct vnode *vp; 1863 struct vattr vattr; 1864 int error; 1865 struct nameidata nd; 1866 1867 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1868 if ((error = namei(&nd)) != 0) 1869 return (error); 1870 vp = nd.ni_vp; 1871 if (vp != NULL) { 1872 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1873 if (nd.ni_dvp == vp) 1874 vrele(nd.ni_dvp); 1875 else 1876 vput(nd.ni_dvp); 1877 vrele(vp); 1878 return (EEXIST); 1879 } 1880 VATTR_NULL(&vattr); 1881 vattr.va_type = VDIR; 1882 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 1883 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1884 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1885 if (!error) 1886 vput(nd.ni_vp); 1887 return (error); 1888 } 1889 1890 /* 1891 * Remove a directory file. 1892 */ 1893 /* ARGSUSED */ 1894 int 1895 sys_rmdir(p, v, retval) 1896 struct proc *p; 1897 void *v; 1898 register_t *retval; 1899 { 1900 struct sys_rmdir_args /* { 1901 syscallarg(const char *) path; 1902 } */ *uap = v; 1903 register struct vnode *vp; 1904 int error; 1905 struct nameidata nd; 1906 1907 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1908 SCARG(uap, path), p); 1909 if ((error = namei(&nd)) != 0) 1910 return (error); 1911 vp = nd.ni_vp; 1912 if (vp->v_type != VDIR) { 1913 error = ENOTDIR; 1914 goto out; 1915 } 1916 /* 1917 * No rmdir "." please. 1918 */ 1919 if (nd.ni_dvp == vp) { 1920 error = EINVAL; 1921 goto out; 1922 } 1923 /* 1924 * The root of a mounted filesystem cannot be deleted. 1925 */ 1926 if (vp->v_flag & VROOT) 1927 error = EBUSY; 1928 out: 1929 if (!error) { 1930 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1931 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1932 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1933 } else { 1934 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1935 if (nd.ni_dvp == vp) 1936 vrele(nd.ni_dvp); 1937 else 1938 vput(nd.ni_dvp); 1939 vput(vp); 1940 } 1941 return (error); 1942 } 1943 1944 /* 1945 * Read a block of directory entries in a file system independent format. 1946 */ 1947 int 1948 sys_getdirentries(p, v, retval) 1949 struct proc *p; 1950 void *v; 1951 register_t *retval; 1952 { 1953 register struct sys_getdirentries_args /* { 1954 syscallarg(int) fd; 1955 syscallarg(char *) buf; 1956 syscallarg(u_int) count; 1957 syscallarg(long *) basep; 1958 } */ *uap = v; 1959 register struct vnode *vp; 1960 struct file *fp; 1961 struct uio auio; 1962 struct iovec aiov; 1963 long loff; 1964 int error, eofflag; 1965 1966 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1967 return (error); 1968 if ((fp->f_flag & FREAD) == 0) 1969 return (EBADF); 1970 vp = (struct vnode *)fp->f_data; 1971 unionread: 1972 if (vp->v_type != VDIR) 1973 return (EINVAL); 1974 aiov.iov_base = SCARG(uap, buf); 1975 aiov.iov_len = SCARG(uap, count); 1976 auio.uio_iov = &aiov; 1977 auio.uio_iovcnt = 1; 1978 auio.uio_rw = UIO_READ; 1979 auio.uio_segflg = UIO_USERSPACE; 1980 auio.uio_procp = p; 1981 auio.uio_resid = SCARG(uap, count); 1982 VOP_LOCK(vp); 1983 loff = auio.uio_offset = fp->f_offset; 1984 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, (u_long *)0, 0); 1985 fp->f_offset = auio.uio_offset; 1986 VOP_UNLOCK(vp); 1987 if (error) 1988 return (error); 1989 1990 #ifdef UNION 1991 { 1992 extern int (**union_vnodeop_p) __P((void *)); 1993 extern struct vnode *union_dircache __P((struct vnode *)); 1994 1995 if ((SCARG(uap, count) == auio.uio_resid) && 1996 (vp->v_op == union_vnodeop_p)) { 1997 struct vnode *lvp; 1998 1999 lvp = union_dircache(vp); 2000 if (lvp != NULLVP) { 2001 struct vattr va; 2002 2003 /* 2004 * If the directory is opaque, 2005 * then don't show lower entries 2006 */ 2007 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 2008 if (va.va_flags & OPAQUE) { 2009 vput(lvp); 2010 lvp = NULL; 2011 } 2012 } 2013 2014 if (lvp != NULLVP) { 2015 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 2016 VOP_UNLOCK(lvp); 2017 2018 if (error) { 2019 vrele(lvp); 2020 return (error); 2021 } 2022 fp->f_data = (caddr_t) lvp; 2023 fp->f_offset = 0; 2024 error = vn_close(vp, FREAD, fp->f_cred, p); 2025 if (error) 2026 return (error); 2027 vp = lvp; 2028 goto unionread; 2029 } 2030 } 2031 } 2032 #endif /* UNION */ 2033 2034 if ((SCARG(uap, count) == auio.uio_resid) && 2035 (vp->v_flag & VROOT) && 2036 (vp->v_mount->mnt_flag & MNT_UNION)) { 2037 struct vnode *tvp = vp; 2038 vp = vp->v_mount->mnt_vnodecovered; 2039 VREF(vp); 2040 fp->f_data = (caddr_t) vp; 2041 fp->f_offset = 0; 2042 vrele(tvp); 2043 goto unionread; 2044 } 2045 error = copyout(&loff, SCARG(uap, basep), sizeof(long)); 2046 *retval = SCARG(uap, count) - auio.uio_resid; 2047 return (error); 2048 } 2049 2050 /* 2051 * Set the mode mask for creation of filesystem nodes. 2052 */ 2053 int 2054 sys_umask(p, v, retval) 2055 struct proc *p; 2056 void *v; 2057 register_t *retval; 2058 { 2059 struct sys_umask_args /* { 2060 syscallarg(int) newmask; 2061 } */ *uap = v; 2062 register struct filedesc *fdp; 2063 2064 fdp = p->p_fd; 2065 *retval = fdp->fd_cmask; 2066 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2067 return (0); 2068 } 2069 2070 /* 2071 * Void all references to file by ripping underlying filesystem 2072 * away from vnode. 2073 */ 2074 /* ARGSUSED */ 2075 int 2076 sys_revoke(p, v, retval) 2077 struct proc *p; 2078 void *v; 2079 register_t *retval; 2080 { 2081 register struct sys_revoke_args /* { 2082 syscallarg(const char *) path; 2083 } */ *uap = v; 2084 register struct vnode *vp; 2085 struct vattr vattr; 2086 int error; 2087 struct nameidata nd; 2088 2089 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2090 if ((error = namei(&nd)) != 0) 2091 return (error); 2092 vp = nd.ni_vp; 2093 if (vp->v_type != VCHR && vp->v_type != VBLK) { 2094 error = EINVAL; 2095 goto out; 2096 } 2097 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2098 goto out; 2099 if (p->p_ucred->cr_uid != vattr.va_uid && 2100 (error = suser(p->p_ucred, &p->p_acflag))) 2101 goto out; 2102 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2103 vgoneall(vp); 2104 out: 2105 vrele(vp); 2106 return (error); 2107 } 2108 2109 /* 2110 * Convert a user file descriptor to a kernel file entry. 2111 */ 2112 int 2113 getvnode(fdp, fd, fpp) 2114 struct filedesc *fdp; 2115 int fd; 2116 struct file **fpp; 2117 { 2118 struct vnode *vp; 2119 struct file *fp; 2120 2121 if ((u_int)fd >= fdp->fd_nfiles || 2122 (fp = fdp->fd_ofiles[fd]) == NULL) 2123 return (EBADF); 2124 if (fp->f_type != DTYPE_VNODE) 2125 return (EINVAL); 2126 vp = (struct vnode *)fp->f_data; 2127 if (vp->v_type == VBAD) 2128 return (EBADF); 2129 *fpp = fp; 2130 return (0); 2131 } 2132
Indexes created Fri Sep 26 08:10:20 GMT 2025