vfs_syscalls.c revision 1.82
1 /* $NetBSD: vfs_syscalls.c,v 1.82 1997/04/07 00:04:16 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 vattr vattr; 1127 register off_t newoff; 1128 int error; 1129 1130 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1131 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1132 return (EBADF); 1133 if (fp->f_type != DTYPE_VNODE 1134 #ifdef FIFO 1135 || ((struct vnode *)fp->f_data)->v_type == VFIFO 1136 #endif 1137 ) 1138 return (ESPIPE); 1139 switch (SCARG(uap, whence)) { 1140 case L_INCR: 1141 newoff = fp->f_offset + SCARG(uap, offset); 1142 break; 1143 case L_XTND: 1144 error = VOP_GETATTR((struct vnode *)fp->f_data, &vattr, 1145 cred, p); 1146 if (error) 1147 return (error); 1148 newoff = SCARG(uap, offset) + vattr.va_size; 1149 break; 1150 case L_SET: 1151 newoff = SCARG(uap, offset); 1152 break; 1153 default: 1154 return (EINVAL); 1155 } 1156 if (newoff < 0) 1157 return (EINVAL); 1158 1159 *(off_t *)retval = fp->f_offset = newoff; 1160 return (0); 1161 } 1162 1163 /* 1164 * Check access permissions. 1165 */ 1166 int 1167 sys_access(p, v, retval) 1168 struct proc *p; 1169 void *v; 1170 register_t *retval; 1171 { 1172 register struct sys_access_args /* { 1173 syscallarg(const char *) path; 1174 syscallarg(int) flags; 1175 } */ *uap = v; 1176 register struct ucred *cred = p->p_ucred; 1177 register struct vnode *vp; 1178 int error, flags, t_gid, t_uid; 1179 struct nameidata nd; 1180 1181 t_uid = cred->cr_uid; 1182 t_gid = cred->cr_gid; 1183 cred->cr_uid = p->p_cred->p_ruid; 1184 cred->cr_gid = p->p_cred->p_rgid; 1185 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1186 SCARG(uap, path), p); 1187 if ((error = namei(&nd)) != 0) 1188 goto out1; 1189 vp = nd.ni_vp; 1190 1191 /* Flags == 0 means only check for existence. */ 1192 if (SCARG(uap, flags)) { 1193 flags = 0; 1194 if (SCARG(uap, flags) & R_OK) 1195 flags |= VREAD; 1196 if (SCARG(uap, flags) & W_OK) 1197 flags |= VWRITE; 1198 if (SCARG(uap, flags) & X_OK) 1199 flags |= VEXEC; 1200 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1201 error = VOP_ACCESS(vp, flags, cred, p); 1202 } 1203 vput(vp); 1204 out1: 1205 cred->cr_uid = t_uid; 1206 cred->cr_gid = t_gid; 1207 return (error); 1208 } 1209 1210 /* 1211 * Get file status; this version follows links. 1212 */ 1213 /* ARGSUSED */ 1214 int 1215 sys_stat(p, v, retval) 1216 struct proc *p; 1217 void *v; 1218 register_t *retval; 1219 { 1220 register struct sys_stat_args /* { 1221 syscallarg(const char *) path; 1222 syscallarg(struct stat *) ub; 1223 } */ *uap = v; 1224 struct stat sb; 1225 int error; 1226 struct nameidata nd; 1227 1228 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1229 SCARG(uap, path), p); 1230 if ((error = namei(&nd)) != 0) 1231 return (error); 1232 error = vn_stat(nd.ni_vp, &sb, p); 1233 vput(nd.ni_vp); 1234 if (error) 1235 return (error); 1236 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1237 return (error); 1238 } 1239 1240 /* 1241 * Get file status; this version does not follow links. 1242 */ 1243 /* ARGSUSED */ 1244 int 1245 sys_lstat(p, v, retval) 1246 struct proc *p; 1247 void *v; 1248 register_t *retval; 1249 { 1250 register struct sys_lstat_args /* { 1251 syscallarg(const char *) path; 1252 syscallarg(struct stat *) ub; 1253 } */ *uap = v; 1254 struct stat sb; 1255 int error; 1256 struct nameidata nd; 1257 1258 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1259 SCARG(uap, path), p); 1260 if ((error = namei(&nd)) != 0) 1261 return (error); 1262 error = vn_stat(nd.ni_vp, &sb, p); 1263 vput(nd.ni_vp); 1264 if (error) 1265 return (error); 1266 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1267 return (error); 1268 } 1269 1270 /* 1271 * Get configurable pathname variables. 1272 */ 1273 /* ARGSUSED */ 1274 int 1275 sys_pathconf(p, v, retval) 1276 struct proc *p; 1277 void *v; 1278 register_t *retval; 1279 { 1280 register struct sys_pathconf_args /* { 1281 syscallarg(const char *) path; 1282 syscallarg(int) name; 1283 } */ *uap = v; 1284 int error; 1285 struct nameidata nd; 1286 1287 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1288 SCARG(uap, path), p); 1289 if ((error = namei(&nd)) != 0) 1290 return (error); 1291 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1292 vput(nd.ni_vp); 1293 return (error); 1294 } 1295 1296 /* 1297 * Return target name of a symbolic link. 1298 */ 1299 /* ARGSUSED */ 1300 int 1301 sys_readlink(p, v, retval) 1302 struct proc *p; 1303 void *v; 1304 register_t *retval; 1305 { 1306 register struct sys_readlink_args /* { 1307 syscallarg(const char *) path; 1308 syscallarg(char *) buf; 1309 syscallarg(int) count; 1310 } */ *uap = v; 1311 register struct vnode *vp; 1312 struct iovec aiov; 1313 struct uio auio; 1314 int error; 1315 struct nameidata nd; 1316 1317 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1318 SCARG(uap, path), p); 1319 if ((error = namei(&nd)) != 0) 1320 return (error); 1321 vp = nd.ni_vp; 1322 if (vp->v_type != VLNK) 1323 error = EINVAL; 1324 else { 1325 aiov.iov_base = SCARG(uap, buf); 1326 aiov.iov_len = SCARG(uap, count); 1327 auio.uio_iov = &aiov; 1328 auio.uio_iovcnt = 1; 1329 auio.uio_offset = 0; 1330 auio.uio_rw = UIO_READ; 1331 auio.uio_segflg = UIO_USERSPACE; 1332 auio.uio_procp = p; 1333 auio.uio_resid = SCARG(uap, count); 1334 error = VOP_READLINK(vp, &auio, p->p_ucred); 1335 } 1336 vput(vp); 1337 *retval = SCARG(uap, count) - auio.uio_resid; 1338 return (error); 1339 } 1340 1341 /* 1342 * Change flags of a file given a path name. 1343 */ 1344 /* ARGSUSED */ 1345 int 1346 sys_chflags(p, v, retval) 1347 struct proc *p; 1348 void *v; 1349 register_t *retval; 1350 { 1351 register struct sys_chflags_args /* { 1352 syscallarg(const char *) path; 1353 syscallarg(u_long) flags; 1354 } */ *uap = v; 1355 register struct vnode *vp; 1356 struct vattr vattr; 1357 int error; 1358 struct nameidata nd; 1359 1360 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1361 if ((error = namei(&nd)) != 0) 1362 return (error); 1363 vp = nd.ni_vp; 1364 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1365 VOP_LOCK(vp); 1366 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1367 error = EROFS; 1368 else { 1369 VATTR_NULL(&vattr); 1370 vattr.va_flags = SCARG(uap, flags); 1371 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1372 } 1373 vput(vp); 1374 return (error); 1375 } 1376 1377 /* 1378 * Change flags of a file given a file descriptor. 1379 */ 1380 /* ARGSUSED */ 1381 int 1382 sys_fchflags(p, v, retval) 1383 struct proc *p; 1384 void *v; 1385 register_t *retval; 1386 { 1387 register struct sys_fchflags_args /* { 1388 syscallarg(int) fd; 1389 syscallarg(u_long) flags; 1390 } */ *uap = v; 1391 struct vattr vattr; 1392 struct vnode *vp; 1393 struct file *fp; 1394 int error; 1395 1396 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1397 return (error); 1398 vp = (struct vnode *)fp->f_data; 1399 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1400 VOP_LOCK(vp); 1401 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1402 error = EROFS; 1403 else { 1404 VATTR_NULL(&vattr); 1405 vattr.va_flags = SCARG(uap, flags); 1406 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1407 } 1408 VOP_UNLOCK(vp); 1409 return (error); 1410 } 1411 1412 /* 1413 * Change mode of a file given path name. 1414 */ 1415 /* ARGSUSED */ 1416 int 1417 sys_chmod(p, v, retval) 1418 struct proc *p; 1419 void *v; 1420 register_t *retval; 1421 { 1422 register struct sys_chmod_args /* { 1423 syscallarg(const char *) path; 1424 syscallarg(int) mode; 1425 } */ *uap = v; 1426 register struct vnode *vp; 1427 struct vattr vattr; 1428 int error; 1429 struct nameidata nd; 1430 1431 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1432 if ((error = namei(&nd)) != 0) 1433 return (error); 1434 vp = nd.ni_vp; 1435 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1436 VOP_LOCK(vp); 1437 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1438 error = EROFS; 1439 else { 1440 VATTR_NULL(&vattr); 1441 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1442 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1443 } 1444 vput(vp); 1445 return (error); 1446 } 1447 1448 /* 1449 * Change mode of a file given a file descriptor. 1450 */ 1451 /* ARGSUSED */ 1452 int 1453 sys_fchmod(p, v, retval) 1454 struct proc *p; 1455 void *v; 1456 register_t *retval; 1457 { 1458 register struct sys_fchmod_args /* { 1459 syscallarg(int) fd; 1460 syscallarg(int) mode; 1461 } */ *uap = v; 1462 struct vattr vattr; 1463 struct vnode *vp; 1464 struct file *fp; 1465 int error; 1466 1467 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1468 return (error); 1469 vp = (struct vnode *)fp->f_data; 1470 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1471 VOP_LOCK(vp); 1472 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1473 error = EROFS; 1474 else { 1475 VATTR_NULL(&vattr); 1476 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1477 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1478 } 1479 VOP_UNLOCK(vp); 1480 return (error); 1481 } 1482 1483 /* 1484 * Set ownership given a path name. 1485 */ 1486 /* ARGSUSED */ 1487 int 1488 sys_chown(p, v, retval) 1489 struct proc *p; 1490 void *v; 1491 register_t *retval; 1492 { 1493 register struct sys_chown_args /* { 1494 syscallarg(const char *) path; 1495 syscallarg(uid_t) uid; 1496 syscallarg(gid_t) gid; 1497 } */ *uap = v; 1498 register struct vnode *vp; 1499 struct vattr vattr; 1500 int error; 1501 struct nameidata nd; 1502 1503 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1504 if ((error = namei(&nd)) != 0) 1505 return (error); 1506 vp = nd.ni_vp; 1507 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1508 VOP_LOCK(vp); 1509 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1510 error = EROFS; 1511 else { 1512 VATTR_NULL(&vattr); 1513 vattr.va_uid = SCARG(uap, uid); 1514 vattr.va_gid = SCARG(uap, gid); 1515 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1516 } 1517 vput(vp); 1518 return (error); 1519 } 1520 1521 /* 1522 * Set ownership given a file descriptor. 1523 */ 1524 /* ARGSUSED */ 1525 int 1526 sys_fchown(p, v, retval) 1527 struct proc *p; 1528 void *v; 1529 register_t *retval; 1530 { 1531 register struct sys_fchown_args /* { 1532 syscallarg(int) fd; 1533 syscallarg(uid_t) uid; 1534 syscallarg(gid_t) gid; 1535 } */ *uap = v; 1536 register struct vnode *vp; 1537 struct vattr vattr; 1538 int error; 1539 struct file *fp; 1540 1541 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1542 return (error); 1543 vp = (struct vnode *)fp->f_data; 1544 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1545 VOP_LOCK(vp); 1546 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1547 error = EROFS; 1548 else { 1549 VATTR_NULL(&vattr); 1550 vattr.va_uid = SCARG(uap, uid); 1551 vattr.va_gid = SCARG(uap, gid); 1552 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1553 } 1554 VOP_UNLOCK(vp); 1555 return (error); 1556 } 1557 1558 /* 1559 * Set the access and modification times given a path name. 1560 */ 1561 /* ARGSUSED */ 1562 int 1563 sys_utimes(p, v, retval) 1564 struct proc *p; 1565 void *v; 1566 register_t *retval; 1567 { 1568 register struct sys_utimes_args /* { 1569 syscallarg(const char *) path; 1570 syscallarg(const struct timeval *) tptr; 1571 } */ *uap = v; 1572 register struct vnode *vp; 1573 struct timeval tv[2]; 1574 struct vattr vattr; 1575 int error; 1576 struct nameidata nd; 1577 1578 VATTR_NULL(&vattr); 1579 if (SCARG(uap, tptr) == NULL) { 1580 microtime(&tv[0]); 1581 tv[1] = tv[0]; 1582 vattr.va_vaflags |= VA_UTIMES_NULL; 1583 } else { 1584 error = copyin(SCARG(uap, tptr), tv, sizeof (tv)); 1585 if (error) 1586 return (error); 1587 } 1588 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1589 if ((error = namei(&nd)) != 0) 1590 return (error); 1591 vp = nd.ni_vp; 1592 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1593 VOP_LOCK(vp); 1594 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1595 error = EROFS; 1596 else { 1597 vattr.va_atime.tv_sec = tv[0].tv_sec; 1598 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1599 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1600 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1601 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1602 } 1603 vput(vp); 1604 return (error); 1605 } 1606 1607 /* 1608 * Set the access and modification times given a file descriptor. 1609 */ 1610 /* ARGSUSED */ 1611 int 1612 sys_futimes(p, v, retval) 1613 struct proc *p; 1614 void *v; 1615 register_t *retval; 1616 { 1617 register struct sys_futimes_args /* { 1618 syscallarg(int) fd; 1619 syscallarg(const struct timeval *) tptr; 1620 } */ *uap = v; 1621 register struct vnode *vp; 1622 struct timeval tv[2]; 1623 struct vattr vattr; 1624 int error; 1625 struct file *fp; 1626 1627 VATTR_NULL(&vattr); 1628 if (SCARG(uap, tptr) == NULL) { 1629 microtime(&tv[0]); 1630 tv[1] = tv[0]; 1631 vattr.va_vaflags |= VA_UTIMES_NULL; 1632 } else { 1633 error = copyin(SCARG(uap, tptr), tv, sizeof (tv)); 1634 if (error) 1635 return (error); 1636 } 1637 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1638 return (error); 1639 vp = (struct vnode *)fp->f_data; 1640 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1641 VOP_LOCK(vp); 1642 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1643 error = EROFS; 1644 else { 1645 vattr.va_atime.tv_sec = tv[0].tv_sec; 1646 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1647 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1648 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1649 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1650 } 1651 VOP_UNLOCK(vp); 1652 return (error); 1653 } 1654 1655 /* 1656 * Truncate a file given its path name. 1657 */ 1658 /* ARGSUSED */ 1659 int 1660 sys_truncate(p, v, retval) 1661 struct proc *p; 1662 void *v; 1663 register_t *retval; 1664 { 1665 register struct sys_truncate_args /* { 1666 syscallarg(const char *) path; 1667 syscallarg(int) pad; 1668 syscallarg(off_t) length; 1669 } */ *uap = v; 1670 register struct vnode *vp; 1671 struct vattr vattr; 1672 int error; 1673 struct nameidata nd; 1674 1675 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1676 if ((error = namei(&nd)) != 0) 1677 return (error); 1678 vp = nd.ni_vp; 1679 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1680 VOP_LOCK(vp); 1681 if (vp->v_type == VDIR) 1682 error = EISDIR; 1683 else if ((error = vn_writechk(vp)) == 0 && 1684 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1685 VATTR_NULL(&vattr); 1686 vattr.va_size = SCARG(uap, length); 1687 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1688 } 1689 vput(vp); 1690 return (error); 1691 } 1692 1693 /* 1694 * Truncate a file given a file descriptor. 1695 */ 1696 /* ARGSUSED */ 1697 int 1698 sys_ftruncate(p, v, retval) 1699 struct proc *p; 1700 void *v; 1701 register_t *retval; 1702 { 1703 register struct sys_ftruncate_args /* { 1704 syscallarg(int) fd; 1705 syscallarg(int) pad; 1706 syscallarg(off_t) length; 1707 } */ *uap = v; 1708 struct vattr vattr; 1709 struct vnode *vp; 1710 struct file *fp; 1711 int error; 1712 1713 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1714 return (error); 1715 if ((fp->f_flag & FWRITE) == 0) 1716 return (EINVAL); 1717 vp = (struct vnode *)fp->f_data; 1718 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1719 VOP_LOCK(vp); 1720 if (vp->v_type == VDIR) 1721 error = EISDIR; 1722 else if ((error = vn_writechk(vp)) == 0) { 1723 VATTR_NULL(&vattr); 1724 vattr.va_size = SCARG(uap, length); 1725 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1726 } 1727 VOP_UNLOCK(vp); 1728 return (error); 1729 } 1730 1731 /* 1732 * Sync an open file. 1733 */ 1734 /* ARGSUSED */ 1735 int 1736 sys_fsync(p, v, retval) 1737 struct proc *p; 1738 void *v; 1739 register_t *retval; 1740 { 1741 struct sys_fsync_args /* { 1742 syscallarg(int) fd; 1743 } */ *uap = v; 1744 register struct vnode *vp; 1745 struct file *fp; 1746 int error; 1747 1748 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1749 return (error); 1750 vp = (struct vnode *)fp->f_data; 1751 VOP_LOCK(vp); 1752 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p); 1753 VOP_UNLOCK(vp); 1754 return (error); 1755 } 1756 1757 /* 1758 * Rename files. Source and destination must either both be directories, 1759 * or both not be directories. If target is a directory, it must be empty. 1760 */ 1761 /* ARGSUSED */ 1762 int 1763 sys_rename(p, v, retval) 1764 struct proc *p; 1765 void *v; 1766 register_t *retval; 1767 { 1768 register struct sys_rename_args /* { 1769 syscallarg(const char *) from; 1770 syscallarg(const char *) to; 1771 } */ *uap = v; 1772 register struct vnode *tvp, *fvp, *tdvp; 1773 struct nameidata fromnd, tond; 1774 int error; 1775 1776 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 1777 SCARG(uap, from), p); 1778 if ((error = namei(&fromnd)) != 0) 1779 return (error); 1780 fvp = fromnd.ni_vp; 1781 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 1782 UIO_USERSPACE, SCARG(uap, to), p); 1783 if ((error = namei(&tond)) != 0) { 1784 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1785 vrele(fromnd.ni_dvp); 1786 vrele(fvp); 1787 goto out1; 1788 } 1789 tdvp = tond.ni_dvp; 1790 tvp = tond.ni_vp; 1791 if (tvp != NULL) { 1792 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 1793 error = ENOTDIR; 1794 goto out; 1795 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 1796 error = EISDIR; 1797 goto out; 1798 } 1799 } 1800 if (fvp == tdvp) 1801 error = EINVAL; 1802 /* 1803 * If source is the same as the destination (that is the 1804 * same inode number with the same name in the same directory), 1805 * then there is nothing to do. 1806 */ 1807 if (fvp == tvp && fromnd.ni_dvp == tdvp && 1808 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 1809 !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, 1810 fromnd.ni_cnd.cn_namelen)) 1811 error = -1; 1812 out: 1813 if (!error) { 1814 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 1815 if (fromnd.ni_dvp != tdvp) 1816 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1817 if (tvp) { 1818 (void)vnode_pager_uncache(tvp); 1819 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 1820 } 1821 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 1822 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 1823 } else { 1824 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 1825 if (tdvp == tvp) 1826 vrele(tdvp); 1827 else 1828 vput(tdvp); 1829 if (tvp) 1830 vput(tvp); 1831 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1832 vrele(fromnd.ni_dvp); 1833 vrele(fvp); 1834 } 1835 vrele(tond.ni_startdir); 1836 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 1837 out1: 1838 if (fromnd.ni_startdir) 1839 vrele(fromnd.ni_startdir); 1840 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 1841 return (error == -1 ? 0 : error); 1842 } 1843 1844 /* 1845 * Make a directory file. 1846 */ 1847 /* ARGSUSED */ 1848 int 1849 sys_mkdir(p, v, retval) 1850 struct proc *p; 1851 void *v; 1852 register_t *retval; 1853 { 1854 register struct sys_mkdir_args /* { 1855 syscallarg(const char *) path; 1856 syscallarg(int) mode; 1857 } */ *uap = v; 1858 register struct vnode *vp; 1859 struct vattr vattr; 1860 int error; 1861 struct nameidata nd; 1862 1863 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1864 if ((error = namei(&nd)) != 0) 1865 return (error); 1866 vp = nd.ni_vp; 1867 if (vp != NULL) { 1868 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1869 if (nd.ni_dvp == vp) 1870 vrele(nd.ni_dvp); 1871 else 1872 vput(nd.ni_dvp); 1873 vrele(vp); 1874 return (EEXIST); 1875 } 1876 VATTR_NULL(&vattr); 1877 vattr.va_type = VDIR; 1878 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 1879 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1880 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1881 if (!error) 1882 vput(nd.ni_vp); 1883 return (error); 1884 } 1885 1886 /* 1887 * Remove a directory file. 1888 */ 1889 /* ARGSUSED */ 1890 int 1891 sys_rmdir(p, v, retval) 1892 struct proc *p; 1893 void *v; 1894 register_t *retval; 1895 { 1896 struct sys_rmdir_args /* { 1897 syscallarg(const char *) path; 1898 } */ *uap = v; 1899 register struct vnode *vp; 1900 int error; 1901 struct nameidata nd; 1902 1903 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1904 SCARG(uap, path), p); 1905 if ((error = namei(&nd)) != 0) 1906 return (error); 1907 vp = nd.ni_vp; 1908 if (vp->v_type != VDIR) { 1909 error = ENOTDIR; 1910 goto out; 1911 } 1912 /* 1913 * No rmdir "." please. 1914 */ 1915 if (nd.ni_dvp == vp) { 1916 error = EINVAL; 1917 goto out; 1918 } 1919 /* 1920 * The root of a mounted filesystem cannot be deleted. 1921 */ 1922 if (vp->v_flag & VROOT) 1923 error = EBUSY; 1924 out: 1925 if (!error) { 1926 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1927 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1928 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1929 } else { 1930 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1931 if (nd.ni_dvp == vp) 1932 vrele(nd.ni_dvp); 1933 else 1934 vput(nd.ni_dvp); 1935 vput(vp); 1936 } 1937 return (error); 1938 } 1939 1940 /* 1941 * Read a block of directory entries in a file system independent format. 1942 */ 1943 int 1944 sys_getdirentries(p, v, retval) 1945 struct proc *p; 1946 void *v; 1947 register_t *retval; 1948 { 1949 register struct sys_getdirentries_args /* { 1950 syscallarg(int) fd; 1951 syscallarg(char *) buf; 1952 syscallarg(u_int) count; 1953 syscallarg(long *) basep; 1954 } */ *uap = v; 1955 register struct vnode *vp; 1956 struct file *fp; 1957 struct uio auio; 1958 struct iovec aiov; 1959 long loff; 1960 int error, eofflag; 1961 1962 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1963 return (error); 1964 if ((fp->f_flag & FREAD) == 0) 1965 return (EBADF); 1966 vp = (struct vnode *)fp->f_data; 1967 unionread: 1968 if (vp->v_type != VDIR) 1969 return (EINVAL); 1970 aiov.iov_base = SCARG(uap, buf); 1971 aiov.iov_len = SCARG(uap, count); 1972 auio.uio_iov = &aiov; 1973 auio.uio_iovcnt = 1; 1974 auio.uio_rw = UIO_READ; 1975 auio.uio_segflg = UIO_USERSPACE; 1976 auio.uio_procp = p; 1977 auio.uio_resid = SCARG(uap, count); 1978 VOP_LOCK(vp); 1979 loff = auio.uio_offset = fp->f_offset; 1980 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, (u_long *)0, 0); 1981 fp->f_offset = auio.uio_offset; 1982 VOP_UNLOCK(vp); 1983 if (error) 1984 return (error); 1985 1986 #ifdef UNION 1987 { 1988 extern int (**union_vnodeop_p) __P((void *)); 1989 extern struct vnode *union_dircache __P((struct vnode *)); 1990 1991 if ((SCARG(uap, count) == auio.uio_resid) && 1992 (vp->v_op == union_vnodeop_p)) { 1993 struct vnode *lvp; 1994 1995 lvp = union_dircache(vp); 1996 if (lvp != NULLVP) { 1997 struct vattr va; 1998 1999 /* 2000 * If the directory is opaque, 2001 * then don't show lower entries 2002 */ 2003 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 2004 if (va.va_flags & OPAQUE) { 2005 vput(lvp); 2006 lvp = NULL; 2007 } 2008 } 2009 2010 if (lvp != NULLVP) { 2011 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 2012 VOP_UNLOCK(lvp); 2013 2014 if (error) { 2015 vrele(lvp); 2016 return (error); 2017 } 2018 fp->f_data = (caddr_t) lvp; 2019 fp->f_offset = 0; 2020 error = vn_close(vp, FREAD, fp->f_cred, p); 2021 if (error) 2022 return (error); 2023 vp = lvp; 2024 goto unionread; 2025 } 2026 } 2027 } 2028 #endif /* UNION */ 2029 2030 if ((SCARG(uap, count) == auio.uio_resid) && 2031 (vp->v_flag & VROOT) && 2032 (vp->v_mount->mnt_flag & MNT_UNION)) { 2033 struct vnode *tvp = vp; 2034 vp = vp->v_mount->mnt_vnodecovered; 2035 VREF(vp); 2036 fp->f_data = (caddr_t) vp; 2037 fp->f_offset = 0; 2038 vrele(tvp); 2039 goto unionread; 2040 } 2041 error = copyout(&loff, SCARG(uap, basep), sizeof(long)); 2042 *retval = SCARG(uap, count) - auio.uio_resid; 2043 return (error); 2044 } 2045 2046 /* 2047 * Set the mode mask for creation of filesystem nodes. 2048 */ 2049 int 2050 sys_umask(p, v, retval) 2051 struct proc *p; 2052 void *v; 2053 register_t *retval; 2054 { 2055 struct sys_umask_args /* { 2056 syscallarg(int) newmask; 2057 } */ *uap = v; 2058 register struct filedesc *fdp; 2059 2060 fdp = p->p_fd; 2061 *retval = fdp->fd_cmask; 2062 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2063 return (0); 2064 } 2065 2066 /* 2067 * Void all references to file by ripping underlying filesystem 2068 * away from vnode. 2069 */ 2070 /* ARGSUSED */ 2071 int 2072 sys_revoke(p, v, retval) 2073 struct proc *p; 2074 void *v; 2075 register_t *retval; 2076 { 2077 register struct sys_revoke_args /* { 2078 syscallarg(const char *) path; 2079 } */ *uap = v; 2080 register struct vnode *vp; 2081 struct vattr vattr; 2082 int error; 2083 struct nameidata nd; 2084 2085 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2086 if ((error = namei(&nd)) != 0) 2087 return (error); 2088 vp = nd.ni_vp; 2089 if (vp->v_type != VCHR && vp->v_type != VBLK) { 2090 error = EINVAL; 2091 goto out; 2092 } 2093 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2094 goto out; 2095 if (p->p_ucred->cr_uid != vattr.va_uid && 2096 (error = suser(p->p_ucred, &p->p_acflag))) 2097 goto out; 2098 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2099 vgoneall(vp); 2100 out: 2101 vrele(vp); 2102 return (error); 2103 } 2104 2105 /* 2106 * Convert a user file descriptor to a kernel file entry. 2107 */ 2108 int 2109 getvnode(fdp, fd, fpp) 2110 struct filedesc *fdp; 2111 int fd; 2112 struct file **fpp; 2113 { 2114 struct vnode *vp; 2115 struct file *fp; 2116 2117 if ((u_int)fd >= fdp->fd_nfiles || 2118 (fp = fdp->fd_ofiles[fd]) == NULL) 2119 return (EBADF); 2120 if (fp->f_type != DTYPE_VNODE) 2121 return (EINVAL); 2122 vp = (struct vnode *)fp->f_data; 2123 if (vp->v_type == VBAD) 2124 return (EBADF); 2125 *fpp = fp; 2126 return (0); 2127 } 2128
Indexes created Fri Sep 26 20:09:58 GMT 2025