vfs_syscalls.c revision 1.54
1 /* $NetBSD: vfs_syscalls.c,v 1.54 1995/06/18 14:47:09 cgd 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 *ndp, struct proc *p)); 63 64 /* 65 * Virtual File System System Calls 66 */ 67 68 /* 69 * Mount a file system. 70 */ 71 /* ARGSUSED */ 72 mount(p, uap, retval) 73 struct proc *p; 74 register struct mount_args /* { 75 syscallarg(char *) type; 76 syscallarg(char *) path; 77 syscallarg(int) flags; 78 syscallarg(caddr_t) data; 79 } */ *uap; 80 register_t *retval; 81 { 82 register struct vnode *vp; 83 register struct mount *mp; 84 int error, flag; 85 u_long fsindex; 86 char fstypename[MFSNAMELEN]; 87 struct vattr va; 88 struct nameidata nd; 89 90 /* 91 * Get vnode to be covered 92 */ 93 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 94 SCARG(uap, path), p); 95 if (error = namei(&nd)) 96 return (error); 97 vp = nd.ni_vp; 98 if (SCARG(uap, flags) & MNT_UPDATE) { 99 if ((vp->v_flag & VROOT) == 0) { 100 vput(vp); 101 return (EINVAL); 102 } 103 mp = vp->v_mount; 104 flag = mp->mnt_flag; 105 /* 106 * We only allow the filesystem to be reloaded if it 107 * is currently mounted read-only. 108 */ 109 if ((SCARG(uap, flags) & MNT_RELOAD) && 110 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 111 vput(vp); 112 return (EOPNOTSUPP); /* Needs translation */ 113 } 114 mp->mnt_flag |= 115 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 116 /* 117 * Only root, or the user that did the original mount is 118 * permitted to update it. 119 */ 120 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 121 (error = suser(p->p_ucred, &p->p_acflag))) { 122 vput(vp); 123 return (error); 124 } 125 /* 126 * Do not allow NFS export by non-root users. Silently 127 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 128 */ 129 if (p->p_ucred->cr_uid != 0) { 130 if (SCARG(uap, flags) & MNT_EXPORTED) { 131 vput(vp); 132 return (EPERM); 133 } 134 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 135 } 136 VOP_UNLOCK(vp); 137 goto update; 138 } 139 /* 140 * If the user is not root, ensure that they own the directory 141 * onto which we are attempting to mount. 142 */ 143 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) || 144 (va.va_uid != p->p_ucred->cr_uid && 145 (error = suser(p->p_ucred, &p->p_acflag)))) { 146 vput(vp); 147 return (error); 148 } 149 /* 150 * Do not allow NFS export by non-root users. Silently 151 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 152 */ 153 if (p->p_ucred->cr_uid != 0) { 154 if (SCARG(uap, flags) & MNT_EXPORTED) { 155 vput(vp); 156 return (EPERM); 157 } 158 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 159 } 160 if (error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) 161 return (error); 162 if (vp->v_type != VDIR) { 163 vput(vp); 164 return (ENOTDIR); 165 } 166 if (error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, 167 (size_t *)0)) { 168 #if defined(COMPAT_09) || defined(COMPAT_43) 169 /* 170 * Historically filesystem types were identified by number. 171 * If we get an integer for the filesystem type instead of a 172 * string, we check to see if it matches one of the historic 173 * filesystem types. 174 */ 175 fsindex = (u_long)SCARG(uap, type); 176 if (fsindex >= nvfssw || vfssw[fsindex] == NULL) { 177 vput(vp); 178 return (ENODEV); 179 } 180 strncpy(fstypename, vfssw[fsindex]->vfs_name, MFSNAMELEN); 181 #else 182 vput(vp); 183 return (error); 184 #endif 185 } 186 for (fsindex = 0; fsindex < nvfssw; fsindex++) 187 if (vfssw[fsindex] != NULL && 188 !strncmp(vfssw[fsindex]->vfs_name, fstypename, MFSNAMELEN)) 189 break; 190 if (fsindex >= nvfssw) { 191 vput(vp); 192 return (ENODEV); 193 } 194 if (vp->v_mountedhere != NULL) { 195 vput(vp); 196 return (EBUSY); 197 } 198 199 /* 200 * Allocate and initialize the file system. 201 */ 202 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 203 M_MOUNT, M_WAITOK); 204 bzero((char *)mp, (u_long)sizeof(struct mount)); 205 mp->mnt_op = vfssw[fsindex]; 206 if (error = vfs_lock(mp)) { 207 free((caddr_t)mp, M_MOUNT); 208 vput(vp); 209 return (error); 210 } 211 /* Do this early in case we block later. */ 212 vfssw[fsindex]->vfs_refcount++; 213 vp->v_mountedhere = mp; 214 mp->mnt_vnodecovered = vp; 215 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 216 update: 217 /* 218 * Set the mount level flags. 219 */ 220 if (SCARG(uap, flags) & MNT_RDONLY) 221 mp->mnt_flag |= MNT_RDONLY; 222 else if (mp->mnt_flag & MNT_RDONLY) 223 mp->mnt_flag |= MNT_WANTRDWR; 224 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 225 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC); 226 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 227 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC); 228 /* 229 * Mount the filesystem. 230 */ 231 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 232 if (mp->mnt_flag & MNT_UPDATE) { 233 vrele(vp); 234 if (mp->mnt_flag & MNT_WANTRDWR) 235 mp->mnt_flag &= ~MNT_RDONLY; 236 mp->mnt_flag &=~ 237 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 238 if (error) 239 mp->mnt_flag = flag; 240 return (error); 241 } 242 /* 243 * Put the new filesystem on the mount list after root. 244 */ 245 cache_purge(vp); 246 if (!error) { 247 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 248 checkdirs(vp); 249 VOP_UNLOCK(vp); 250 vfs_unlock(mp); 251 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 252 error = VFS_START(mp, 0, p); 253 } else { 254 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 255 vfssw[fsindex]->vfs_refcount--; 256 vfs_unlock(mp); 257 free((caddr_t)mp, M_MOUNT); 258 vput(vp); 259 } 260 return (error); 261 } 262 263 /* 264 * Scan all active processes to see if any of them have a current 265 * or root directory onto which the new filesystem has just been 266 * mounted. If so, replace them with the new mount point. 267 */ 268 checkdirs(olddp) 269 struct vnode *olddp; 270 { 271 struct filedesc *fdp; 272 struct vnode *newdp; 273 struct proc *p; 274 275 if (olddp->v_usecount == 1) 276 return; 277 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 278 panic("mount: lost mount"); 279 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 280 fdp = p->p_fd; 281 if (fdp->fd_cdir == olddp) { 282 vrele(fdp->fd_cdir); 283 VREF(newdp); 284 fdp->fd_cdir = newdp; 285 } 286 if (fdp->fd_rdir == olddp) { 287 vrele(fdp->fd_rdir); 288 VREF(newdp); 289 fdp->fd_rdir = newdp; 290 } 291 } 292 if (rootvnode == olddp) { 293 vrele(rootvnode); 294 VREF(newdp); 295 rootvnode = newdp; 296 } 297 vput(newdp); 298 } 299 300 /* 301 * Unmount a file system. 302 * 303 * Note: unmount takes a path to the vnode mounted on as argument, 304 * not special file (as before). 305 */ 306 /* ARGSUSED */ 307 unmount(p, uap, retval) 308 struct proc *p; 309 register struct unmount_args /* { 310 syscallarg(char *) path; 311 syscallarg(int) flags; 312 } */ *uap; 313 register_t *retval; 314 { 315 register struct vnode *vp; 316 struct mount *mp; 317 int error; 318 struct nameidata nd; 319 320 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 321 SCARG(uap, path), p); 322 if (error = namei(&nd)) 323 return (error); 324 vp = nd.ni_vp; 325 mp = vp->v_mount; 326 327 /* 328 * Only root, or the user that did the original mount is 329 * permitted to unmount this filesystem. 330 */ 331 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 332 (error = suser(p->p_ucred, &p->p_acflag))) { 333 vput(vp); 334 return (error); 335 } 336 337 /* 338 * Don't allow unmounting the root file system. 339 */ 340 if (mp->mnt_flag & MNT_ROOTFS) { 341 vput(vp); 342 return (EINVAL); 343 } 344 345 /* 346 * Must be the root of the filesystem 347 */ 348 if ((vp->v_flag & VROOT) == 0) { 349 vput(vp); 350 return (EINVAL); 351 } 352 vput(vp); 353 return (dounmount(mp, SCARG(uap, flags), p)); 354 } 355 356 /* 357 * Do the actual file system unmount. 358 */ 359 dounmount(mp, flags, p) 360 register struct mount *mp; 361 int flags; 362 struct proc *p; 363 { 364 struct vnode *coveredvp; 365 int error; 366 367 coveredvp = mp->mnt_vnodecovered; 368 if (vfs_busy(mp)) 369 return (EBUSY); 370 mp->mnt_flag |= MNT_UNMOUNT; 371 if (error = vfs_lock(mp)) 372 return (error); 373 374 mp->mnt_flag &=~ MNT_ASYNC; 375 vnode_pager_umount(mp); /* release cached vnodes */ 376 cache_purgevfs(mp); /* remove cache entries for this file sys */ 377 if ((error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0 || 378 (flags & MNT_FORCE)) 379 error = VFS_UNMOUNT(mp, flags, p); 380 mp->mnt_flag &= ~MNT_UNMOUNT; 381 vfs_unbusy(mp); 382 if (error) { 383 vfs_unlock(mp); 384 } else { 385 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 386 if (coveredvp != NULLVP) { 387 vrele(coveredvp); 388 coveredvp->v_mountedhere = (struct mount *)0; 389 } 390 mp->mnt_op->vfs_refcount--; 391 vfs_unlock(mp); 392 if (mp->mnt_vnodelist.lh_first != NULL) 393 panic("unmount: dangling vnode"); 394 free((caddr_t)mp, M_MOUNT); 395 } 396 return (error); 397 } 398 399 /* 400 * Sync each mounted filesystem. 401 */ 402 #ifdef DEBUG 403 int syncprt = 0; 404 struct ctldebug debug0 = { "syncprt", &syncprt }; 405 #endif 406 407 /* ARGSUSED */ 408 sync(p, uap, retval) 409 struct proc *p; 410 void *uap; 411 register_t *retval; 412 { 413 register struct mount *mp, *nmp; 414 int asyncflag; 415 416 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 417 /* 418 * Get the next pointer in case we hang on vfs_busy 419 * while we are being unmounted. 420 */ 421 nmp = mp->mnt_list.cqe_next; 422 /* 423 * The lock check below is to avoid races with mount 424 * and unmount. 425 */ 426 if ((mp->mnt_flag & (MNT_MLOCK|MNT_RDONLY|MNT_MPBUSY)) == 0 && 427 !vfs_busy(mp)) { 428 asyncflag = mp->mnt_flag & MNT_ASYNC; 429 mp->mnt_flag &= ~MNT_ASYNC; 430 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 431 if (asyncflag) 432 mp->mnt_flag |= MNT_ASYNC; 433 /* 434 * Get the next pointer again, as the next filesystem 435 * might have been unmounted while we were sync'ing. 436 */ 437 nmp = mp->mnt_list.cqe_next; 438 vfs_unbusy(mp); 439 } 440 } 441 #ifdef DEBUG 442 if (syncprt) 443 vfs_bufstats(); 444 #endif /* DEBUG */ 445 return (0); 446 } 447 448 /* 449 * Change filesystem quotas. 450 */ 451 /* ARGSUSED */ 452 quotactl(p, uap, retval) 453 struct proc *p; 454 register struct quotactl_args /* { 455 syscallarg(char *) path; 456 syscallarg(int) cmd; 457 syscallarg(int) uid; 458 syscallarg(caddr_t) arg; 459 } */ *uap; 460 register_t *retval; 461 { 462 register struct mount *mp; 463 int error; 464 struct nameidata nd; 465 466 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 467 if (error = namei(&nd)) 468 return (error); 469 mp = nd.ni_vp->v_mount; 470 vrele(nd.ni_vp); 471 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 472 SCARG(uap, arg), p)); 473 } 474 475 /* 476 * Get filesystem statistics. 477 */ 478 /* ARGSUSED */ 479 statfs(p, uap, retval) 480 struct proc *p; 481 register struct statfs_args /* { 482 syscallarg(char *) path; 483 syscallarg(struct statfs *) buf; 484 } */ *uap; 485 register_t *retval; 486 { 487 register struct mount *mp; 488 register struct statfs *sp; 489 int error; 490 struct nameidata nd; 491 492 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 493 if (error = namei(&nd)) 494 return (error); 495 mp = nd.ni_vp->v_mount; 496 sp = &mp->mnt_stat; 497 vrele(nd.ni_vp); 498 if (error = VFS_STATFS(mp, sp, p)) 499 return (error); 500 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 501 return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); 502 } 503 504 /* 505 * Get filesystem statistics. 506 */ 507 /* ARGSUSED */ 508 fstatfs(p, uap, retval) 509 struct proc *p; 510 register struct fstatfs_args /* { 511 syscallarg(int) fd; 512 syscallarg(struct statfs *) buf; 513 } */ *uap; 514 register_t *retval; 515 { 516 struct file *fp; 517 struct mount *mp; 518 register struct statfs *sp; 519 int error; 520 521 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 522 return (error); 523 mp = ((struct vnode *)fp->f_data)->v_mount; 524 sp = &mp->mnt_stat; 525 if (error = VFS_STATFS(mp, sp, p)) 526 return (error); 527 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 528 return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); 529 } 530 531 /* 532 * Get statistics on all filesystems. 533 */ 534 getfsstat(p, uap, retval) 535 struct proc *p; 536 register struct getfsstat_args /* { 537 syscallarg(struct statfs *) buf; 538 syscallarg(long) bufsize; 539 syscallarg(int) flags; 540 } */ *uap; 541 register_t *retval; 542 { 543 register struct mount *mp, *nmp; 544 register struct statfs *sp; 545 caddr_t sfsp; 546 long count, maxcount, error; 547 548 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 549 sfsp = (caddr_t)SCARG(uap, buf); 550 for (count = 0, 551 mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 552 nmp = mp->mnt_list.cqe_next; 553 if (sfsp && count < maxcount && 554 ((mp->mnt_flag & MNT_MLOCK) == 0)) { 555 sp = &mp->mnt_stat; 556 /* 557 * If MNT_NOWAIT is specified, do not refresh the 558 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 559 */ 560 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 561 (SCARG(uap, flags) & MNT_WAIT)) && 562 (error = VFS_STATFS(mp, sp, p))) 563 continue; 564 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 565 if (error = copyout((caddr_t)sp, sfsp, sizeof(*sp))) 566 return (error); 567 sfsp += sizeof(*sp); 568 } 569 count++; 570 } 571 if (sfsp && count > maxcount) 572 *retval = maxcount; 573 else 574 *retval = count; 575 return (0); 576 } 577 578 /* 579 * Change current working directory to a given file descriptor. 580 */ 581 /* ARGSUSED */ 582 fchdir(p, uap, retval) 583 struct proc *p; 584 struct fchdir_args /* { 585 syscallarg(int) fd; 586 } */ *uap; 587 register_t *retval; 588 { 589 register struct filedesc *fdp = p->p_fd; 590 struct vnode *vp, *tdp; 591 struct mount *mp; 592 struct file *fp; 593 int error; 594 595 if (error = getvnode(fdp, SCARG(uap, fd), &fp)) 596 return (error); 597 vp = (struct vnode *)fp->f_data; 598 VREF(vp); 599 VOP_LOCK(vp); 600 if (vp->v_type != VDIR) 601 error = ENOTDIR; 602 else 603 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 604 while (!error && (mp = vp->v_mountedhere) != NULL) { 605 if (mp->mnt_flag & MNT_MLOCK) { 606 mp->mnt_flag |= MNT_MWAIT; 607 sleep((caddr_t)mp, PVFS); 608 continue; 609 } 610 if (error = VFS_ROOT(mp, &tdp)) 611 break; 612 vput(vp); 613 vp = tdp; 614 } 615 VOP_UNLOCK(vp); 616 if (error) { 617 vrele(vp); 618 return (error); 619 } 620 vrele(fdp->fd_cdir); 621 fdp->fd_cdir = vp; 622 return (0); 623 } 624 625 /* 626 * Change current working directory (``.''). 627 */ 628 /* ARGSUSED */ 629 chdir(p, uap, retval) 630 struct proc *p; 631 struct chdir_args /* { 632 syscallarg(char *) path; 633 } */ *uap; 634 register_t *retval; 635 { 636 register struct filedesc *fdp = p->p_fd; 637 int error; 638 struct nameidata nd; 639 640 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 641 SCARG(uap, path), p); 642 if (error = change_dir(&nd, p)) 643 return (error); 644 vrele(fdp->fd_cdir); 645 fdp->fd_cdir = nd.ni_vp; 646 return (0); 647 } 648 649 /* 650 * Change notion of root (``/'') directory. 651 */ 652 /* ARGSUSED */ 653 chroot(p, uap, retval) 654 struct proc *p; 655 struct chroot_args /* { 656 syscallarg(char *) path; 657 } */ *uap; 658 register_t *retval; 659 { 660 register struct filedesc *fdp = p->p_fd; 661 int error; 662 struct nameidata nd; 663 664 if (error = suser(p->p_ucred, &p->p_acflag)) 665 return (error); 666 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 667 SCARG(uap, path), p); 668 if (error = change_dir(&nd, p)) 669 return (error); 670 if (fdp->fd_rdir != NULL) 671 vrele(fdp->fd_rdir); 672 fdp->fd_rdir = nd.ni_vp; 673 return (0); 674 } 675 676 /* 677 * Common routine for chroot and chdir. 678 */ 679 static int 680 change_dir(ndp, p) 681 register struct nameidata *ndp; 682 struct proc *p; 683 { 684 struct vnode *vp; 685 int error; 686 687 if (error = namei(ndp)) 688 return (error); 689 vp = ndp->ni_vp; 690 if (vp->v_type != VDIR) 691 error = ENOTDIR; 692 else 693 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 694 VOP_UNLOCK(vp); 695 if (error) 696 vrele(vp); 697 return (error); 698 } 699 700 /* 701 * Check permissions, allocate an open file structure, 702 * and call the device open routine if any. 703 */ 704 open(p, uap, retval) 705 struct proc *p; 706 register struct open_args /* { 707 syscallarg(char *) path; 708 syscallarg(int) flags; 709 syscallarg(int) mode; 710 } */ *uap; 711 register_t *retval; 712 { 713 register struct filedesc *fdp = p->p_fd; 714 register struct file *fp; 715 register struct vnode *vp; 716 int flags, cmode; 717 struct file *nfp; 718 int type, indx, error; 719 struct flock lf; 720 struct nameidata nd; 721 extern struct fileops vnops; 722 723 if (error = falloc(p, &nfp, &indx)) 724 return (error); 725 fp = nfp; 726 flags = FFLAGS(SCARG(uap, flags)); 727 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 728 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 729 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 730 if (error = vn_open(&nd, flags, cmode)) { 731 ffree(fp); 732 if ((error == ENODEV || error == ENXIO) && 733 p->p_dupfd >= 0 && /* XXX from fdopen */ 734 (error = 735 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 736 *retval = indx; 737 return (0); 738 } 739 if (error == ERESTART) 740 error = EINTR; 741 fdp->fd_ofiles[indx] = NULL; 742 return (error); 743 } 744 p->p_dupfd = 0; 745 vp = nd.ni_vp; 746 fp->f_flag = flags & FMASK; 747 fp->f_type = DTYPE_VNODE; 748 fp->f_ops = &vnops; 749 fp->f_data = (caddr_t)vp; 750 if (flags & (O_EXLOCK | O_SHLOCK)) { 751 lf.l_whence = SEEK_SET; 752 lf.l_start = 0; 753 lf.l_len = 0; 754 if (flags & O_EXLOCK) 755 lf.l_type = F_WRLCK; 756 else 757 lf.l_type = F_RDLCK; 758 type = F_FLOCK; 759 if ((flags & FNONBLOCK) == 0) 760 type |= F_WAIT; 761 VOP_UNLOCK(vp); 762 if (error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) { 763 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 764 ffree(fp); 765 fdp->fd_ofiles[indx] = NULL; 766 return (error); 767 } 768 VOP_LOCK(vp); 769 fp->f_flag |= FHASLOCK; 770 } 771 VOP_UNLOCK(vp); 772 *retval = indx; 773 return (0); 774 } 775 776 #ifdef COMPAT_43 777 /* 778 * Create a file. 779 */ 780 compat_43_creat(p, uap, retval) 781 struct proc *p; 782 register struct compat_43_creat_args /* { 783 syscallarg(char *) path; 784 syscallarg(int) mode; 785 } */ *uap; 786 register_t *retval; 787 { 788 struct open_args /* { 789 syscallarg(char *) path; 790 syscallarg(int) flags; 791 syscallarg(int) mode; 792 } */ nuap; 793 794 SCARG(&nuap, path) = SCARG(uap, path); 795 SCARG(&nuap, mode) = SCARG(uap, mode); 796 SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC; 797 return (open(p, &nuap, retval)); 798 } 799 #endif /* COMPAT_43 */ 800 801 /* 802 * Create a special file. 803 */ 804 /* ARGSUSED */ 805 mknod(p, uap, retval) 806 struct proc *p; 807 register struct mknod_args /* { 808 syscallarg(char *) path; 809 syscallarg(int) mode; 810 syscallarg(int) dev; 811 } */ *uap; 812 register_t *retval; 813 { 814 register struct vnode *vp; 815 struct vattr vattr; 816 int error; 817 int whiteout; 818 struct nameidata nd; 819 820 if (error = suser(p->p_ucred, &p->p_acflag)) 821 return (error); 822 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 823 if (error = namei(&nd)) 824 return (error); 825 vp = nd.ni_vp; 826 if (vp != NULL) 827 error = EEXIST; 828 else { 829 VATTR_NULL(&vattr); 830 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 831 vattr.va_rdev = SCARG(uap, dev); 832 whiteout = 0; 833 834 switch (SCARG(uap, mode) & S_IFMT) { 835 case S_IFMT: /* used by badsect to flag bad sectors */ 836 vattr.va_type = VBAD; 837 break; 838 case S_IFCHR: 839 vattr.va_type = VCHR; 840 break; 841 case S_IFBLK: 842 vattr.va_type = VBLK; 843 break; 844 case S_IFWHT: 845 whiteout = 1; 846 break; 847 default: 848 error = EINVAL; 849 break; 850 } 851 } 852 if (!error) { 853 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 854 if (whiteout) { 855 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 856 if (error) 857 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 858 vput(nd.ni_dvp); 859 } else { 860 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 861 &nd.ni_cnd, &vattr); 862 } 863 } else { 864 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 865 if (nd.ni_dvp == vp) 866 vrele(nd.ni_dvp); 867 else 868 vput(nd.ni_dvp); 869 if (vp) 870 vrele(vp); 871 } 872 return (error); 873 } 874 875 /* 876 * Create a named pipe. 877 */ 878 /* ARGSUSED */ 879 mkfifo(p, uap, retval) 880 struct proc *p; 881 register struct mkfifo_args /* { 882 syscallarg(char *) path; 883 syscallarg(int) mode; 884 } */ *uap; 885 register_t *retval; 886 { 887 struct vattr vattr; 888 int error; 889 struct nameidata nd; 890 891 #ifndef FIFO 892 return (EOPNOTSUPP); 893 #else 894 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 895 if (error = namei(&nd)) 896 return (error); 897 if (nd.ni_vp != NULL) { 898 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 899 if (nd.ni_dvp == nd.ni_vp) 900 vrele(nd.ni_dvp); 901 else 902 vput(nd.ni_dvp); 903 vrele(nd.ni_vp); 904 return (EEXIST); 905 } 906 VATTR_NULL(&vattr); 907 vattr.va_type = VFIFO; 908 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 909 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 910 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 911 #endif /* FIFO */ 912 } 913 914 /* 915 * Make a hard file link. 916 */ 917 /* ARGSUSED */ 918 link(p, uap, retval) 919 struct proc *p; 920 register struct link_args /* { 921 syscallarg(char *) path; 922 syscallarg(char *) link; 923 } */ *uap; 924 register_t *retval; 925 { 926 register struct vnode *vp; 927 struct nameidata nd; 928 int error; 929 930 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 931 if (error = namei(&nd)) 932 return (error); 933 vp = nd.ni_vp; 934 if (vp->v_type != VDIR || 935 (error = suser(p->p_ucred, &p->p_acflag)) == 0) { 936 nd.ni_cnd.cn_nameiop = CREATE; 937 nd.ni_cnd.cn_flags = LOCKPARENT; 938 nd.ni_dirp = SCARG(uap, link); 939 if ((error = namei(&nd)) == 0) { 940 if (nd.ni_vp != NULL) 941 error = EEXIST; 942 if (!error) { 943 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, 944 LEASE_WRITE); 945 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 946 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 947 } else { 948 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 949 if (nd.ni_dvp == nd.ni_vp) 950 vrele(nd.ni_dvp); 951 else 952 vput(nd.ni_dvp); 953 if (nd.ni_vp) 954 vrele(nd.ni_vp); 955 } 956 } 957 } 958 vrele(vp); 959 return (error); 960 } 961 962 /* 963 * Make a symbolic link. 964 */ 965 /* ARGSUSED */ 966 symlink(p, uap, retval) 967 struct proc *p; 968 register struct symlink_args /* { 969 syscallarg(char *) path; 970 syscallarg(char *) link; 971 } */ *uap; 972 register_t *retval; 973 { 974 struct vattr vattr; 975 char *path; 976 int error; 977 struct nameidata nd; 978 979 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 980 if (error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, (size_t *)0)) 981 goto out; 982 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 983 if (error = namei(&nd)) 984 goto out; 985 if (nd.ni_vp) { 986 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 987 if (nd.ni_dvp == nd.ni_vp) 988 vrele(nd.ni_dvp); 989 else 990 vput(nd.ni_dvp); 991 vrele(nd.ni_vp); 992 error = EEXIST; 993 goto out; 994 } 995 VATTR_NULL(&vattr); 996 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 997 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 998 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 999 out: 1000 FREE(path, M_NAMEI); 1001 return (error); 1002 } 1003 1004 /* 1005 * Delete a whiteout from the filesystem. 1006 */ 1007 /* ARGSUSED */ 1008 undelete(p, uap, retval) 1009 struct proc *p; 1010 register struct undelete_args /* { 1011 syscallarg(char *) path; 1012 } */ *uap; 1013 register_t *retval; 1014 { 1015 int error; 1016 struct nameidata nd; 1017 1018 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1019 SCARG(uap, path), p); 1020 error = namei(&nd); 1021 if (error) 1022 return (error); 1023 1024 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1025 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1026 if (nd.ni_dvp == nd.ni_vp) 1027 vrele(nd.ni_dvp); 1028 else 1029 vput(nd.ni_dvp); 1030 if (nd.ni_vp) 1031 vrele(nd.ni_vp); 1032 return (EEXIST); 1033 } 1034 1035 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1036 if (error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) 1037 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1038 vput(nd.ni_dvp); 1039 return (error); 1040 } 1041 1042 /* 1043 * Delete a name from the filesystem. 1044 */ 1045 /* ARGSUSED */ 1046 unlink(p, uap, retval) 1047 struct proc *p; 1048 struct unlink_args /* { 1049 syscallarg(char *) path; 1050 } */ *uap; 1051 register_t *retval; 1052 { 1053 register struct vnode *vp; 1054 int error; 1055 struct nameidata nd; 1056 1057 NDINIT(&nd, DELETE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1058 if (error = namei(&nd)) 1059 return (error); 1060 vp = nd.ni_vp; 1061 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1062 VOP_LOCK(vp); 1063 1064 if (vp->v_type != VDIR || 1065 (error = suser(p->p_ucred, &p->p_acflag)) == 0) { 1066 /* 1067 * The root of a mounted filesystem cannot be deleted. 1068 */ 1069 if (vp->v_flag & VROOT) 1070 error = EBUSY; 1071 else 1072 (void)vnode_pager_uncache(vp); 1073 } 1074 1075 if (!error) { 1076 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1077 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1078 } else { 1079 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1080 if (nd.ni_dvp == vp) 1081 vrele(nd.ni_dvp); 1082 else 1083 vput(nd.ni_dvp); 1084 if (vp != NULLVP) 1085 vput(vp); 1086 } 1087 return (error); 1088 } 1089 1090 /* 1091 * Reposition read/write file offset. 1092 */ 1093 lseek(p, uap, retval) 1094 struct proc *p; 1095 register struct lseek_args /* { 1096 syscallarg(int) fd; 1097 syscallarg(int) pad; 1098 syscallarg(off_t) offset; 1099 syscallarg(int) whence; 1100 } */ *uap; 1101 register_t *retval; 1102 { 1103 struct ucred *cred = p->p_ucred; 1104 register struct filedesc *fdp = p->p_fd; 1105 register struct file *fp; 1106 struct vattr vattr; 1107 int error; 1108 1109 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1110 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1111 return (EBADF); 1112 if (fp->f_type != DTYPE_VNODE) 1113 return (ESPIPE); 1114 switch (SCARG(uap, whence)) { 1115 case L_INCR: 1116 fp->f_offset += SCARG(uap, offset); 1117 break; 1118 case L_XTND: 1119 if (error = 1120 VOP_GETATTR((struct vnode *)fp->f_data, &vattr, cred, p)) 1121 return (error); 1122 fp->f_offset = SCARG(uap, offset) + vattr.va_size; 1123 break; 1124 case L_SET: 1125 fp->f_offset = SCARG(uap, offset); 1126 break; 1127 default: 1128 return (EINVAL); 1129 } 1130 *(off_t *)retval = fp->f_offset; 1131 return (0); 1132 } 1133 1134 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) || defined(COMPAT_SVR4) || \ 1135 defined (COMPAT_LINUX) || defined(COMPAT_HPUX) 1136 /* 1137 * Reposition read/write file offset. 1138 */ 1139 compat_43_lseek(p, uap, retval) 1140 struct proc *p; 1141 register struct compat_43_lseek_args /* { 1142 syscallarg(int) fd; 1143 syscallarg(long) offset; 1144 syscallarg(int) whence; 1145 } */ *uap; 1146 register_t *retval; 1147 { 1148 struct lseek_args /* { 1149 syscallarg(int) fd; 1150 syscallarg(int) pad; 1151 syscallarg(off_t) offset; 1152 syscallarg(int) whence; 1153 } */ nuap; 1154 off_t qret; 1155 int error; 1156 1157 SCARG(&nuap, fd) = SCARG(uap, fd); 1158 SCARG(&nuap, offset) = SCARG(uap, offset); 1159 SCARG(&nuap, whence) = SCARG(uap, whence); 1160 error = lseek(p, &nuap, &qret); 1161 *(long *)retval = qret; 1162 return (error); 1163 } 1164 #endif /* COMPAT_43 || COMPAT_SUNOS || COMPAT_SVR4 || COMPAT_LINUX || COMPAT_HPUX */ 1165 1166 /* 1167 * Check access permissions. 1168 */ 1169 access(p, uap, retval) 1170 struct proc *p; 1171 register struct access_args /* { 1172 syscallarg(char *) path; 1173 syscallarg(int) flags; 1174 } */ *uap; 1175 register_t *retval; 1176 { 1177 register struct ucred *cred = p->p_ucred; 1178 register struct vnode *vp; 1179 int error, flags, t_gid, t_uid; 1180 struct nameidata nd; 1181 1182 t_uid = cred->cr_uid; 1183 t_gid = cred->cr_gid; 1184 cred->cr_uid = p->p_cred->p_ruid; 1185 cred->cr_gid = p->p_cred->p_rgid; 1186 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1187 SCARG(uap, path), p); 1188 if (error = namei(&nd)) 1189 goto out1; 1190 vp = nd.ni_vp; 1191 1192 /* Flags == 0 means only check for existence. */ 1193 if (SCARG(uap, flags)) { 1194 flags = 0; 1195 if (SCARG(uap, flags) & R_OK) 1196 flags |= VREAD; 1197 if (SCARG(uap, flags) & W_OK) 1198 flags |= VWRITE; 1199 if (SCARG(uap, flags) & X_OK) 1200 flags |= VEXEC; 1201 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1202 error = VOP_ACCESS(vp, flags, cred, p); 1203 } 1204 vput(vp); 1205 out1: 1206 cred->cr_uid = t_uid; 1207 cred->cr_gid = t_gid; 1208 return (error); 1209 } 1210 1211 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) || defined(COMPAT_IBCS2) \ 1212 || defined(COMPAT_LINUX) 1213 /* 1214 * Get file status; this version follows links. 1215 */ 1216 /* ARGSUSED */ 1217 compat_43_stat(p, uap, retval) 1218 struct proc *p; 1219 register struct compat_43_stat_args /* { 1220 syscallarg(char *) path; 1221 syscallarg(struct ostat *) ub; 1222 } */ *uap; 1223 register_t *retval; 1224 { 1225 struct stat sb; 1226 struct ostat osb; 1227 int error; 1228 struct nameidata nd; 1229 1230 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1231 SCARG(uap, path), p); 1232 if (error = namei(&nd)) 1233 return (error); 1234 error = vn_stat(nd.ni_vp, &sb, p); 1235 vput(nd.ni_vp); 1236 if (error) 1237 return (error); 1238 cvtstat(&sb, &osb); 1239 error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb)); 1240 return (error); 1241 } 1242 1243 /* 1244 * Get file status; this version does not follow links. 1245 */ 1246 /* ARGSUSED */ 1247 compat_43_lstat(p, uap, retval) 1248 struct proc *p; 1249 register struct compat_43_lstat_args /* { 1250 syscallarg(char *) path; 1251 syscallarg(struct ostat *) ub; 1252 } */ *uap; 1253 register_t *retval; 1254 { 1255 struct vnode *vp, *dvp; 1256 struct stat sb, sb1; 1257 struct ostat osb; 1258 int error; 1259 struct nameidata nd; 1260 1261 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | LOCKPARENT, UIO_USERSPACE, 1262 SCARG(uap, path), p); 1263 if (error = namei(&nd)) 1264 return (error); 1265 /* 1266 * For symbolic links, always return the attributes of its 1267 * containing directory, except for mode, size, and links. 1268 */ 1269 vp = nd.ni_vp; 1270 dvp = nd.ni_dvp; 1271 if (vp->v_type != VLNK) { 1272 if (dvp == vp) 1273 vrele(dvp); 1274 else 1275 vput(dvp); 1276 error = vn_stat(vp, &sb, p); 1277 vput(vp); 1278 if (error) 1279 return (error); 1280 } else { 1281 error = vn_stat(dvp, &sb, p); 1282 vput(dvp); 1283 if (error) { 1284 vput(vp); 1285 return (error); 1286 } 1287 error = vn_stat(vp, &sb1, p); 1288 vput(vp); 1289 if (error) 1290 return (error); 1291 sb.st_mode &= ~S_IFDIR; 1292 sb.st_mode |= S_IFLNK; 1293 sb.st_nlink = sb1.st_nlink; 1294 sb.st_size = sb1.st_size; 1295 sb.st_blocks = sb1.st_blocks; 1296 } 1297 cvtstat(&sb, &osb); 1298 error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb)); 1299 return (error); 1300 } 1301 1302 /* 1303 * Convert from an old to a new stat structure. 1304 */ 1305 cvtstat(st, ost) 1306 struct stat *st; 1307 struct ostat *ost; 1308 { 1309 1310 ost->st_dev = st->st_dev; 1311 ost->st_ino = st->st_ino; 1312 ost->st_mode = st->st_mode; 1313 ost->st_nlink = st->st_nlink; 1314 ost->st_uid = st->st_uid; 1315 ost->st_gid = st->st_gid; 1316 ost->st_rdev = st->st_rdev; 1317 if (st->st_size < (quad_t)1 << 32) 1318 ost->st_size = st->st_size; 1319 else 1320 ost->st_size = -2; 1321 ost->st_atime = st->st_atime; 1322 ost->st_mtime = st->st_mtime; 1323 ost->st_ctime = st->st_ctime; 1324 ost->st_blksize = st->st_blksize; 1325 ost->st_blocks = st->st_blocks; 1326 ost->st_flags = st->st_flags; 1327 ost->st_gen = st->st_gen; 1328 } 1329 #endif /* COMPAT_43 || COMPAT_SUNOS || COMPAT_IBCS2 || COMPAT_LINUX */ 1330 1331 /* 1332 * Get file status; this version follows links. 1333 */ 1334 /* ARGSUSED */ 1335 stat(p, uap, retval) 1336 struct proc *p; 1337 register struct stat_args /* { 1338 syscallarg(char *) path; 1339 syscallarg(struct stat *) ub; 1340 } */ *uap; 1341 register_t *retval; 1342 { 1343 struct stat sb; 1344 int error; 1345 struct nameidata nd; 1346 1347 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1348 SCARG(uap, path), p); 1349 if (error = namei(&nd)) 1350 return (error); 1351 error = vn_stat(nd.ni_vp, &sb, p); 1352 vput(nd.ni_vp); 1353 if (error) 1354 return (error); 1355 error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); 1356 return (error); 1357 } 1358 1359 /* 1360 * Get file status; this version does not follow links. 1361 */ 1362 /* ARGSUSED */ 1363 lstat(p, uap, retval) 1364 struct proc *p; 1365 register struct lstat_args /* { 1366 syscallarg(char *) path; 1367 syscallarg(struct stat *) ub; 1368 } */ *uap; 1369 register_t *retval; 1370 { 1371 int error; 1372 struct vnode *vp, *dvp; 1373 struct stat sb, sb1; 1374 struct nameidata nd; 1375 1376 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | LOCKPARENT, UIO_USERSPACE, 1377 SCARG(uap, path), p); 1378 if (error = namei(&nd)) 1379 return (error); 1380 /* 1381 * For symbolic links, always return the attributes of its 1382 * containing directory, except for mode, size, and links. 1383 */ 1384 vp = nd.ni_vp; 1385 dvp = nd.ni_dvp; 1386 if (vp->v_type != VLNK) { 1387 if (dvp == vp) 1388 vrele(dvp); 1389 else 1390 vput(dvp); 1391 error = vn_stat(vp, &sb, p); 1392 vput(vp); 1393 if (error) 1394 return (error); 1395 } else { 1396 error = vn_stat(dvp, &sb, p); 1397 vput(dvp); 1398 if (error) { 1399 vput(vp); 1400 return (error); 1401 } 1402 error = vn_stat(vp, &sb1, p); 1403 vput(vp); 1404 if (error) 1405 return (error); 1406 sb.st_mode &= ~S_IFDIR; 1407 sb.st_mode |= S_IFLNK; 1408 sb.st_nlink = sb1.st_nlink; 1409 sb.st_size = sb1.st_size; 1410 sb.st_blocks = sb1.st_blocks; 1411 } 1412 error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); 1413 return (error); 1414 } 1415 1416 /* 1417 * Get configurable pathname variables. 1418 */ 1419 /* ARGSUSED */ 1420 pathconf(p, uap, retval) 1421 struct proc *p; 1422 register struct pathconf_args /* { 1423 syscallarg(char *) path; 1424 syscallarg(int) name; 1425 } */ *uap; 1426 register_t *retval; 1427 { 1428 int error; 1429 struct nameidata nd; 1430 1431 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1432 SCARG(uap, path), p); 1433 if (error = namei(&nd)) 1434 return (error); 1435 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1436 vput(nd.ni_vp); 1437 return (error); 1438 } 1439 1440 /* 1441 * Return target name of a symbolic link. 1442 */ 1443 /* ARGSUSED */ 1444 readlink(p, uap, retval) 1445 struct proc *p; 1446 register struct readlink_args /* { 1447 syscallarg(char *) path; 1448 syscallarg(char *) buf; 1449 syscallarg(int) count; 1450 } */ *uap; 1451 register_t *retval; 1452 { 1453 register struct vnode *vp; 1454 struct iovec aiov; 1455 struct uio auio; 1456 int error; 1457 struct nameidata nd; 1458 1459 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1460 SCARG(uap, path), p); 1461 if (error = namei(&nd)) 1462 return (error); 1463 vp = nd.ni_vp; 1464 if (vp->v_type != VLNK) 1465 error = EINVAL; 1466 else { 1467 aiov.iov_base = SCARG(uap, buf); 1468 aiov.iov_len = SCARG(uap, count); 1469 auio.uio_iov = &aiov; 1470 auio.uio_iovcnt = 1; 1471 auio.uio_offset = 0; 1472 auio.uio_rw = UIO_READ; 1473 auio.uio_segflg = UIO_USERSPACE; 1474 auio.uio_procp = p; 1475 auio.uio_resid = SCARG(uap, count); 1476 error = VOP_READLINK(vp, &auio, p->p_ucred); 1477 } 1478 vput(vp); 1479 *retval = SCARG(uap, count) - auio.uio_resid; 1480 return (error); 1481 } 1482 1483 /* 1484 * Change flags of a file given a path name. 1485 */ 1486 /* ARGSUSED */ 1487 chflags(p, uap, retval) 1488 struct proc *p; 1489 register struct chflags_args /* { 1490 syscallarg(char *) path; 1491 syscallarg(int) flags; 1492 } */ *uap; 1493 register_t *retval; 1494 { 1495 register struct vnode *vp; 1496 struct vattr vattr; 1497 int error; 1498 struct nameidata nd; 1499 1500 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1501 if (error = namei(&nd)) 1502 return (error); 1503 vp = nd.ni_vp; 1504 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1505 VOP_LOCK(vp); 1506 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1507 error = EROFS; 1508 else { 1509 VATTR_NULL(&vattr); 1510 vattr.va_flags = SCARG(uap, flags); 1511 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1512 } 1513 vput(vp); 1514 return (error); 1515 } 1516 1517 /* 1518 * Change flags of a file given a file descriptor. 1519 */ 1520 /* ARGSUSED */ 1521 fchflags(p, uap, retval) 1522 struct proc *p; 1523 register struct fchflags_args /* { 1524 syscallarg(int) fd; 1525 syscallarg(int) flags; 1526 } */ *uap; 1527 register_t *retval; 1528 { 1529 struct vattr vattr; 1530 struct vnode *vp; 1531 struct file *fp; 1532 int error; 1533 1534 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1535 return (error); 1536 vp = (struct vnode *)fp->f_data; 1537 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1538 VOP_LOCK(vp); 1539 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1540 error = EROFS; 1541 else { 1542 VATTR_NULL(&vattr); 1543 vattr.va_flags = SCARG(uap, flags); 1544 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1545 } 1546 VOP_UNLOCK(vp); 1547 return (error); 1548 } 1549 1550 /* 1551 * Change mode of a file given path name. 1552 */ 1553 /* ARGSUSED */ 1554 chmod(p, uap, retval) 1555 struct proc *p; 1556 register struct chmod_args /* { 1557 syscallarg(char *) path; 1558 syscallarg(int) mode; 1559 } */ *uap; 1560 register_t *retval; 1561 { 1562 register struct vnode *vp; 1563 struct vattr vattr; 1564 int error; 1565 struct nameidata nd; 1566 1567 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1568 if (error = namei(&nd)) 1569 return (error); 1570 vp = nd.ni_vp; 1571 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1572 VOP_LOCK(vp); 1573 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1574 error = EROFS; 1575 else { 1576 VATTR_NULL(&vattr); 1577 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1578 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1579 } 1580 vput(vp); 1581 return (error); 1582 } 1583 1584 /* 1585 * Change mode of a file given a file descriptor. 1586 */ 1587 /* ARGSUSED */ 1588 fchmod(p, uap, retval) 1589 struct proc *p; 1590 register struct fchmod_args /* { 1591 syscallarg(int) fd; 1592 syscallarg(int) mode; 1593 } */ *uap; 1594 register_t *retval; 1595 { 1596 struct vattr vattr; 1597 struct vnode *vp; 1598 struct file *fp; 1599 int error; 1600 1601 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1602 return (error); 1603 vp = (struct vnode *)fp->f_data; 1604 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1605 VOP_LOCK(vp); 1606 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1607 error = EROFS; 1608 else { 1609 VATTR_NULL(&vattr); 1610 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1611 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1612 } 1613 VOP_UNLOCK(vp); 1614 return (error); 1615 } 1616 1617 /* 1618 * Set ownership given a path name. 1619 */ 1620 /* ARGSUSED */ 1621 chown(p, uap, retval) 1622 struct proc *p; 1623 register struct chown_args /* { 1624 syscallarg(char *) path; 1625 syscallarg(int) uid; 1626 syscallarg(int) gid; 1627 } */ *uap; 1628 register_t *retval; 1629 { 1630 register struct vnode *vp; 1631 struct vattr vattr; 1632 int error; 1633 struct nameidata nd; 1634 1635 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1636 if (error = namei(&nd)) 1637 return (error); 1638 vp = nd.ni_vp; 1639 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1640 VOP_LOCK(vp); 1641 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1642 error = EROFS; 1643 else { 1644 VATTR_NULL(&vattr); 1645 vattr.va_uid = SCARG(uap, uid); 1646 vattr.va_gid = SCARG(uap, gid); 1647 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1648 } 1649 vput(vp); 1650 return (error); 1651 } 1652 1653 /* 1654 * Set ownership given a file descriptor. 1655 */ 1656 /* ARGSUSED */ 1657 fchown(p, uap, retval) 1658 struct proc *p; 1659 register struct fchown_args /* { 1660 syscallarg(int) fd; 1661 syscallarg(int) uid; 1662 syscallarg(int) gid; 1663 } */ *uap; 1664 register_t *retval; 1665 { 1666 struct vattr vattr; 1667 struct vnode *vp; 1668 struct file *fp; 1669 int error; 1670 1671 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1672 return (error); 1673 vp = (struct vnode *)fp->f_data; 1674 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1675 VOP_LOCK(vp); 1676 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1677 error = EROFS; 1678 else { 1679 VATTR_NULL(&vattr); 1680 vattr.va_uid = SCARG(uap, uid); 1681 vattr.va_gid = SCARG(uap, gid); 1682 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1683 } 1684 VOP_UNLOCK(vp); 1685 return (error); 1686 } 1687 1688 /* 1689 * Set the access and modification times of a file. 1690 */ 1691 /* ARGSUSED */ 1692 utimes(p, uap, retval) 1693 struct proc *p; 1694 register struct utimes_args /* { 1695 syscallarg(char *) path; 1696 syscallarg(struct timeval *) tptr; 1697 } */ *uap; 1698 register_t *retval; 1699 { 1700 register struct vnode *vp; 1701 struct timeval tv[2]; 1702 struct vattr vattr; 1703 int error; 1704 struct nameidata nd; 1705 1706 VATTR_NULL(&vattr); 1707 if (SCARG(uap, tptr) == NULL) { 1708 microtime(&tv[0]); 1709 tv[1] = tv[0]; 1710 vattr.va_vaflags |= VA_UTIMES_NULL; 1711 } else if (error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv, 1712 sizeof (tv))) 1713 return (error); 1714 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1715 if (error = namei(&nd)) 1716 return (error); 1717 vp = nd.ni_vp; 1718 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1719 VOP_LOCK(vp); 1720 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1721 error = EROFS; 1722 else { 1723 vattr.va_atime.ts_sec = tv[0].tv_sec; 1724 vattr.va_atime.ts_nsec = tv[0].tv_usec * 1000; 1725 vattr.va_mtime.ts_sec = tv[1].tv_sec; 1726 vattr.va_mtime.ts_nsec = tv[1].tv_usec * 1000; 1727 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1728 } 1729 vput(vp); 1730 return (error); 1731 } 1732 1733 /* 1734 * Truncate a file given its path name. 1735 */ 1736 /* ARGSUSED */ 1737 truncate(p, uap, retval) 1738 struct proc *p; 1739 register struct truncate_args /* { 1740 syscallarg(char *) path; 1741 syscallarg(int) pad; 1742 syscallarg(off_t) length; 1743 } */ *uap; 1744 register_t *retval; 1745 { 1746 register struct vnode *vp; 1747 struct vattr vattr; 1748 int error; 1749 struct nameidata nd; 1750 1751 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1752 if (error = namei(&nd)) 1753 return (error); 1754 vp = nd.ni_vp; 1755 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1756 VOP_LOCK(vp); 1757 if (vp->v_type == VDIR) 1758 error = EISDIR; 1759 else if ((error = vn_writechk(vp)) == 0 && 1760 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1761 VATTR_NULL(&vattr); 1762 vattr.va_size = SCARG(uap, length); 1763 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1764 } 1765 vput(vp); 1766 return (error); 1767 } 1768 1769 /* 1770 * Truncate a file given a file descriptor. 1771 */ 1772 /* ARGSUSED */ 1773 ftruncate(p, uap, retval) 1774 struct proc *p; 1775 register struct ftruncate_args /* { 1776 syscallarg(int) fd; 1777 syscallarg(int) pad; 1778 syscallarg(off_t) length; 1779 } */ *uap; 1780 register_t *retval; 1781 { 1782 struct vattr vattr; 1783 struct vnode *vp; 1784 struct file *fp; 1785 int error; 1786 1787 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1788 return (error); 1789 if ((fp->f_flag & FWRITE) == 0) 1790 return (EINVAL); 1791 vp = (struct vnode *)fp->f_data; 1792 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1793 VOP_LOCK(vp); 1794 if (vp->v_type == VDIR) 1795 error = EISDIR; 1796 else if ((error = vn_writechk(vp)) == 0) { 1797 VATTR_NULL(&vattr); 1798 vattr.va_size = SCARG(uap, length); 1799 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1800 } 1801 VOP_UNLOCK(vp); 1802 return (error); 1803 } 1804 1805 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) || defined(COMPAT_LINUX) || \ 1806 defined(COMPAT_HPUX) 1807 /* 1808 * Truncate a file given its path name. 1809 */ 1810 /* ARGSUSED */ 1811 compat_43_truncate(p, uap, retval) 1812 struct proc *p; 1813 register struct compat_43_truncate_args /* { 1814 syscallarg(char *) path; 1815 syscallarg(long) length; 1816 } */ *uap; 1817 register_t *retval; 1818 { 1819 struct truncate_args /* { 1820 syscallarg(char *) path; 1821 syscallarg(int) pad; 1822 syscallarg(off_t) length; 1823 } */ nuap; 1824 1825 SCARG(&nuap, path) = SCARG(uap, path); 1826 SCARG(&nuap, length) = SCARG(uap, length); 1827 return (truncate(p, &nuap, retval)); 1828 } 1829 1830 /* 1831 * Truncate a file given a file descriptor. 1832 */ 1833 /* ARGSUSED */ 1834 compat_43_ftruncate(p, uap, retval) 1835 struct proc *p; 1836 register struct compat_43_ftruncate_args /* { 1837 syscallarg(int) fd; 1838 syscallarg(long) length; 1839 } */ *uap; 1840 register_t *retval; 1841 { 1842 struct ftruncate_args /* { 1843 syscallarg(int) fd; 1844 syscallarg(int) pad; 1845 syscallarg(off_t) length; 1846 } */ nuap; 1847 1848 SCARG(&nuap, fd) = SCARG(uap, fd); 1849 SCARG(&nuap, length) = SCARG(uap, length); 1850 return (ftruncate(p, &nuap, retval)); 1851 } 1852 #endif /* COMPAT_43 || COMPAT_SUNOS || COMPAT_LINUX */ 1853 1854 /* 1855 * Sync an open file. 1856 */ 1857 /* ARGSUSED */ 1858 fsync(p, uap, retval) 1859 struct proc *p; 1860 struct fsync_args /* { 1861 syscallarg(int) fd; 1862 } */ *uap; 1863 register_t *retval; 1864 { 1865 register struct vnode *vp; 1866 struct file *fp; 1867 int error; 1868 1869 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1870 return (error); 1871 vp = (struct vnode *)fp->f_data; 1872 VOP_LOCK(vp); 1873 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p); 1874 VOP_UNLOCK(vp); 1875 return (error); 1876 } 1877 1878 /* 1879 * Rename files. Source and destination must either both be directories, 1880 * or both not be directories. If target is a directory, it must be empty. 1881 */ 1882 /* ARGSUSED */ 1883 rename(p, uap, retval) 1884 struct proc *p; 1885 register struct rename_args /* { 1886 syscallarg(char *) from; 1887 syscallarg(char *) to; 1888 } */ *uap; 1889 register_t *retval; 1890 { 1891 register struct vnode *tvp, *fvp, *tdvp; 1892 struct nameidata fromnd, tond; 1893 int error; 1894 1895 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 1896 SCARG(uap, from), p); 1897 if (error = namei(&fromnd)) 1898 return (error); 1899 fvp = fromnd.ni_vp; 1900 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 1901 UIO_USERSPACE, SCARG(uap, to), p); 1902 if (error = namei(&tond)) { 1903 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1904 vrele(fromnd.ni_dvp); 1905 vrele(fvp); 1906 goto out1; 1907 } 1908 tdvp = tond.ni_dvp; 1909 tvp = tond.ni_vp; 1910 if (tvp != NULL) { 1911 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 1912 error = ENOTDIR; 1913 goto out; 1914 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 1915 error = EISDIR; 1916 goto out; 1917 } 1918 } 1919 if (fvp == tdvp) 1920 error = EINVAL; 1921 /* 1922 * If source is the same as the destination (that is the 1923 * same inode number with the same name in the same directory), 1924 * then there is nothing to do. 1925 */ 1926 if (fvp == tvp && fromnd.ni_dvp == tdvp && 1927 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 1928 !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, 1929 fromnd.ni_cnd.cn_namelen)) 1930 error = -1; 1931 out: 1932 if (!error) { 1933 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 1934 if (fromnd.ni_dvp != tdvp) 1935 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1936 if (tvp) 1937 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 1938 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 1939 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 1940 } else { 1941 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 1942 if (tdvp == tvp) 1943 vrele(tdvp); 1944 else 1945 vput(tdvp); 1946 if (tvp) 1947 vput(tvp); 1948 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1949 vrele(fromnd.ni_dvp); 1950 vrele(fvp); 1951 } 1952 vrele(tond.ni_startdir); 1953 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 1954 out1: 1955 if (fromnd.ni_startdir) 1956 vrele(fromnd.ni_startdir); 1957 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 1958 if (error == -1) 1959 return (0); 1960 return (error); 1961 } 1962 1963 /* 1964 * Make a directory file. 1965 */ 1966 /* ARGSUSED */ 1967 mkdir(p, uap, retval) 1968 struct proc *p; 1969 register struct mkdir_args /* { 1970 syscallarg(char *) path; 1971 syscallarg(int) mode; 1972 } */ *uap; 1973 register_t *retval; 1974 { 1975 register struct vnode *vp; 1976 struct vattr vattr; 1977 int error; 1978 struct nameidata nd; 1979 1980 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1981 if (error = namei(&nd)) 1982 return (error); 1983 vp = nd.ni_vp; 1984 if (vp != NULL) { 1985 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1986 if (nd.ni_dvp == vp) 1987 vrele(nd.ni_dvp); 1988 else 1989 vput(nd.ni_dvp); 1990 vrele(vp); 1991 return (EEXIST); 1992 } 1993 VATTR_NULL(&vattr); 1994 vattr.va_type = VDIR; 1995 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 1996 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1997 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1998 if (!error) 1999 vput(nd.ni_vp); 2000 return (error); 2001 } 2002 2003 /* 2004 * Remove a directory file. 2005 */ 2006 /* ARGSUSED */ 2007 rmdir(p, uap, retval) 2008 struct proc *p; 2009 struct rmdir_args /* { 2010 syscallarg(char *) path; 2011 } */ *uap; 2012 register_t *retval; 2013 { 2014 register struct vnode *vp; 2015 int error; 2016 struct nameidata nd; 2017 2018 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2019 SCARG(uap, path), p); 2020 if (error = namei(&nd)) 2021 return (error); 2022 vp = nd.ni_vp; 2023 if (vp->v_type != VDIR) { 2024 error = ENOTDIR; 2025 goto out; 2026 } 2027 /* 2028 * No rmdir "." please. 2029 */ 2030 if (nd.ni_dvp == vp) { 2031 error = EINVAL; 2032 goto out; 2033 } 2034 /* 2035 * The root of a mounted filesystem cannot be deleted. 2036 */ 2037 if (vp->v_flag & VROOT) 2038 error = EBUSY; 2039 out: 2040 if (!error) { 2041 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2042 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2043 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2044 } else { 2045 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2046 if (nd.ni_dvp == vp) 2047 vrele(nd.ni_dvp); 2048 else 2049 vput(nd.ni_dvp); 2050 vput(vp); 2051 } 2052 return (error); 2053 } 2054 2055 #if defined(COMPAT_43) || defined(COMPAT_HPUX) 2056 /* 2057 * Read a block of directory entries in a file system independent format. 2058 */ 2059 compat_43_getdirentries(p, uap, retval) 2060 struct proc *p; 2061 register struct compat_43_getdirentries_args /* { 2062 syscallarg(int) fd; 2063 syscallarg(char *) buf; 2064 syscallarg(u_int) count; 2065 syscallarg(long *) basep; 2066 } */ *uap; 2067 register_t *retval; 2068 { 2069 register struct vnode *vp; 2070 struct file *fp; 2071 struct uio auio, kuio; 2072 struct iovec aiov, kiov; 2073 struct dirent *dp, *edp; 2074 caddr_t dirbuf; 2075 int error, eofflag, readcnt; 2076 long loff; 2077 2078 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 2079 return (error); 2080 if ((fp->f_flag & FREAD) == 0) 2081 return (EBADF); 2082 vp = (struct vnode *)fp->f_data; 2083 unionread: 2084 if (vp->v_type != VDIR) 2085 return (EINVAL); 2086 aiov.iov_base = SCARG(uap, buf); 2087 aiov.iov_len = SCARG(uap, count); 2088 auio.uio_iov = &aiov; 2089 auio.uio_iovcnt = 1; 2090 auio.uio_rw = UIO_READ; 2091 auio.uio_segflg = UIO_USERSPACE; 2092 auio.uio_procp = p; 2093 auio.uio_resid = SCARG(uap, count); 2094 VOP_LOCK(vp); 2095 loff = auio.uio_offset = fp->f_offset; 2096 # if (BYTE_ORDER != LITTLE_ENDIAN) 2097 if (vp->v_mount->mnt_maxsymlinklen <= 0) { 2098 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 2099 (u_long *)0, 0); 2100 fp->f_offset = auio.uio_offset; 2101 } else 2102 # endif 2103 { 2104 kuio = auio; 2105 kuio.uio_iov = &kiov; 2106 kuio.uio_segflg = UIO_SYSSPACE; 2107 kiov.iov_len = SCARG(uap, count); 2108 MALLOC(dirbuf, caddr_t, SCARG(uap, count), M_TEMP, M_WAITOK); 2109 kiov.iov_base = dirbuf; 2110 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, 2111 (u_long *)0, 0); 2112 fp->f_offset = kuio.uio_offset; 2113 if (error == 0) { 2114 readcnt = SCARG(uap, count) - kuio.uio_resid; 2115 edp = (struct dirent *)&dirbuf[readcnt]; 2116 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 2117 # if (BYTE_ORDER == LITTLE_ENDIAN) 2118 /* 2119 * The expected low byte of 2120 * dp->d_namlen is our dp->d_type. 2121 * The high MBZ byte of dp->d_namlen 2122 * is our dp->d_namlen. 2123 */ 2124 dp->d_type = dp->d_namlen; 2125 dp->d_namlen = 0; 2126 # else 2127 /* 2128 * The dp->d_type is the high byte 2129 * of the expected dp->d_namlen, 2130 * so must be zero'ed. 2131 */ 2132 dp->d_type = 0; 2133 # endif 2134 if (dp->d_reclen > 0) { 2135 dp = (struct dirent *) 2136 ((char *)dp + dp->d_reclen); 2137 } else { 2138 error = EIO; 2139 break; 2140 } 2141 } 2142 if (dp >= edp) 2143 error = uiomove(dirbuf, readcnt, &auio); 2144 } 2145 FREE(dirbuf, M_TEMP); 2146 } 2147 VOP_UNLOCK(vp); 2148 if (error) 2149 return (error); 2150 2151 #ifdef UNION 2152 { 2153 extern int (**union_vnodeop_p)(); 2154 extern struct vnode *union_dircache __P((struct vnode *)); 2155 2156 if ((SCARG(uap, count) == auio.uio_resid) && 2157 (vp->v_op == union_vnodeop_p)) { 2158 struct vnode *lvp; 2159 2160 lvp = union_dircache(vp); 2161 if (lvp != NULLVP) { 2162 struct vattr va; 2163 2164 /* 2165 * If the directory is opaque, 2166 * then don't show lower entries 2167 */ 2168 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 2169 if (va.va_flags & OPAQUE) { 2170 vput(lvp); 2171 lvp = NULL; 2172 } 2173 } 2174 2175 if (lvp != NULLVP) { 2176 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 2177 VOP_UNLOCK(lvp); 2178 2179 if (error) { 2180 vrele(lvp); 2181 return (error); 2182 } 2183 fp->f_data = (caddr_t) lvp; 2184 fp->f_offset = 0; 2185 error = vn_close(vp, FREAD, fp->f_cred, p); 2186 if (error) 2187 return (error); 2188 vp = lvp; 2189 goto unionread; 2190 } 2191 } 2192 } 2193 #endif /* UNION */ 2194 2195 if ((SCARG(uap, count) == auio.uio_resid) && 2196 (vp->v_flag & VROOT) && 2197 (vp->v_mount->mnt_flag & MNT_UNION)) { 2198 struct vnode *tvp = vp; 2199 vp = vp->v_mount->mnt_vnodecovered; 2200 VREF(vp); 2201 fp->f_data = (caddr_t) vp; 2202 fp->f_offset = 0; 2203 vrele(tvp); 2204 goto unionread; 2205 } 2206 error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), 2207 sizeof(long)); 2208 *retval = SCARG(uap, count) - auio.uio_resid; 2209 return (error); 2210 } 2211 #endif /* COMPAT_43 */ 2212 2213 /* 2214 * Read a block of directory entries in a file system independent format. 2215 */ 2216 getdirentries(p, uap, retval) 2217 struct proc *p; 2218 register struct getdirentries_args /* { 2219 syscallarg(int) fd; 2220 syscallarg(char *) buf; 2221 syscallarg(u_int) count; 2222 syscallarg(long *) basep; 2223 } */ *uap; 2224 register_t *retval; 2225 { 2226 register struct vnode *vp; 2227 struct file *fp; 2228 struct uio auio; 2229 struct iovec aiov; 2230 long loff; 2231 int error, eofflag; 2232 2233 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 2234 return (error); 2235 if ((fp->f_flag & FREAD) == 0) 2236 return (EBADF); 2237 vp = (struct vnode *)fp->f_data; 2238 unionread: 2239 if (vp->v_type != VDIR) 2240 return (EINVAL); 2241 aiov.iov_base = SCARG(uap, buf); 2242 aiov.iov_len = SCARG(uap, count); 2243 auio.uio_iov = &aiov; 2244 auio.uio_iovcnt = 1; 2245 auio.uio_rw = UIO_READ; 2246 auio.uio_segflg = UIO_USERSPACE; 2247 auio.uio_procp = p; 2248 auio.uio_resid = SCARG(uap, count); 2249 VOP_LOCK(vp); 2250 loff = auio.uio_offset = fp->f_offset; 2251 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, (u_long *)0, 0); 2252 fp->f_offset = auio.uio_offset; 2253 VOP_UNLOCK(vp); 2254 if (error) 2255 return (error); 2256 2257 #ifdef UNION 2258 { 2259 extern int (**union_vnodeop_p)(); 2260 extern struct vnode *union_dircache __P((struct vnode *)); 2261 2262 if ((SCARG(uap, count) == auio.uio_resid) && 2263 (vp->v_op == union_vnodeop_p)) { 2264 struct vnode *lvp; 2265 2266 lvp = union_dircache(vp); 2267 if (lvp != NULLVP) { 2268 struct vattr va; 2269 2270 /* 2271 * If the directory is opaque, 2272 * then don't show lower entries 2273 */ 2274 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 2275 if (va.va_flags & OPAQUE) { 2276 vput(lvp); 2277 lvp = NULL; 2278 } 2279 } 2280 2281 if (lvp != NULLVP) { 2282 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 2283 VOP_UNLOCK(lvp); 2284 2285 if (error) { 2286 vrele(lvp); 2287 return (error); 2288 } 2289 fp->f_data = (caddr_t) lvp; 2290 fp->f_offset = 0; 2291 error = vn_close(vp, FREAD, fp->f_cred, p); 2292 if (error) 2293 return (error); 2294 vp = lvp; 2295 goto unionread; 2296 } 2297 } 2298 } 2299 #endif /* UNION */ 2300 2301 if ((SCARG(uap, count) == auio.uio_resid) && 2302 (vp->v_flag & VROOT) && 2303 (vp->v_mount->mnt_flag & MNT_UNION)) { 2304 struct vnode *tvp = vp; 2305 vp = vp->v_mount->mnt_vnodecovered; 2306 VREF(vp); 2307 fp->f_data = (caddr_t) vp; 2308 fp->f_offset = 0; 2309 vrele(tvp); 2310 goto unionread; 2311 } 2312 error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), 2313 sizeof(long)); 2314 *retval = SCARG(uap, count) - auio.uio_resid; 2315 return (error); 2316 } 2317 2318 /* 2319 * Set the mode mask for creation of filesystem nodes. 2320 */ 2321 mode_t /* XXX */ 2322 umask(p, uap, retval) 2323 struct proc *p; 2324 struct umask_args /* { 2325 syscallarg(int) newmask; 2326 } */ *uap; 2327 register_t *retval; 2328 { 2329 register struct filedesc *fdp; 2330 2331 fdp = p->p_fd; 2332 *retval = fdp->fd_cmask; 2333 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2334 return (0); 2335 } 2336 2337 /* 2338 * Void all references to file by ripping underlying filesystem 2339 * away from vnode. 2340 */ 2341 /* ARGSUSED */ 2342 revoke(p, uap, retval) 2343 struct proc *p; 2344 register struct revoke_args /* { 2345 syscallarg(char *) path; 2346 } */ *uap; 2347 register_t *retval; 2348 { 2349 register struct vnode *vp; 2350 struct vattr vattr; 2351 int error; 2352 struct nameidata nd; 2353 2354 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2355 if (error = namei(&nd)) 2356 return (error); 2357 vp = nd.ni_vp; 2358 if (vp->v_type != VCHR && vp->v_type != VBLK) { 2359 error = EINVAL; 2360 goto out; 2361 } 2362 if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) 2363 goto out; 2364 if (p->p_ucred->cr_uid != vattr.va_uid && 2365 (error = suser(p->p_ucred, &p->p_acflag))) 2366 goto out; 2367 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2368 vgoneall(vp); 2369 out: 2370 vrele(vp); 2371 return (error); 2372 } 2373 2374 /* 2375 * Convert a user file descriptor to a kernel file entry. 2376 */ 2377 getvnode(fdp, fd, fpp) 2378 struct filedesc *fdp; 2379 struct file **fpp; 2380 int fd; 2381 { 2382 struct file *fp; 2383 2384 if ((u_int)fd >= fdp->fd_nfiles || 2385 (fp = fdp->fd_ofiles[fd]) == NULL) 2386 return (EBADF); 2387 if (fp->f_type != DTYPE_VNODE) 2388 return (EINVAL); 2389 *fpp = fp; 2390 return (0); 2391 } 2392
Indexes created Thu Sep 25 16:09:42 GMT 2025