vfs_syscalls.c revision 1.98
1 /* $NetBSD: vfs_syscalls.c,v 1.98 1997/10/03 14:44:26 enami 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 static int change_mode __P((struct vnode *, int, struct proc *p)); 64 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *)); 65 static int change_utimes __P((struct vnode *vp, const struct timeval *, 66 struct proc *p)); 67 static int rename_files __P((const char *, const char *, struct proc *, int)); 68 69 void checkdirs __P((struct vnode *)); 70 int dounmount __P((struct mount *, int, struct proc *)); 71 72 /* 73 * Virtual File System System Calls 74 */ 75 76 /* 77 * Mount a file system. 78 */ 79 /* ARGSUSED */ 80 int 81 sys_mount(p, v, retval) 82 struct proc *p; 83 void *v; 84 register_t *retval; 85 { 86 register struct sys_mount_args /* { 87 syscallarg(const char *) type; 88 syscallarg(const char *) path; 89 syscallarg(int) flags; 90 syscallarg(void *) data; 91 } */ *uap = v; 92 register struct vnode *vp; 93 register struct mount *mp; 94 int error, flag = 0; 95 u_long fsindex = 0; 96 char fstypename[MFSNAMELEN]; 97 struct vattr va; 98 struct nameidata nd; 99 100 /* 101 * Get vnode to be covered 102 */ 103 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 104 SCARG(uap, path), p); 105 if ((error = namei(&nd)) != 0) 106 return (error); 107 vp = nd.ni_vp; 108 if (SCARG(uap, flags) & MNT_UPDATE) { 109 if ((vp->v_flag & VROOT) == 0) { 110 vput(vp); 111 return (EINVAL); 112 } 113 mp = vp->v_mount; 114 flag = mp->mnt_flag; 115 /* 116 * We only allow the filesystem to be reloaded if it 117 * is currently mounted read-only. 118 */ 119 if ((SCARG(uap, flags) & MNT_RELOAD) && 120 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 121 vput(vp); 122 return (EOPNOTSUPP); /* Needs translation */ 123 } 124 mp->mnt_flag |= 125 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 126 /* 127 * Only root, or the user that did the original mount is 128 * permitted to update it. 129 */ 130 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 131 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 132 vput(vp); 133 return (error); 134 } 135 /* 136 * Do not allow NFS export by non-root users. Silently 137 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 138 */ 139 if (p->p_ucred->cr_uid != 0) { 140 if (SCARG(uap, flags) & MNT_EXPORTED) { 141 vput(vp); 142 return (EPERM); 143 } 144 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 145 } 146 VOP_UNLOCK(vp); 147 goto update; 148 } 149 /* 150 * If the user is not root, ensure that they own the directory 151 * onto which we are attempting to mount. 152 */ 153 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 154 (va.va_uid != p->p_ucred->cr_uid && 155 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 156 vput(vp); 157 return (error); 158 } 159 /* 160 * Do not allow NFS export by non-root users. Silently 161 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 162 */ 163 if (p->p_ucred->cr_uid != 0) { 164 if (SCARG(uap, flags) & MNT_EXPORTED) { 165 vput(vp); 166 return (EPERM); 167 } 168 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 169 } 170 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 171 return (error); 172 if (vp->v_type != VDIR) { 173 vput(vp); 174 return (ENOTDIR); 175 } 176 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 177 if (error) { 178 #if defined(COMPAT_09) || defined(COMPAT_43) 179 /* 180 * Historically filesystem types were identified by number. 181 * If we get an integer for the filesystem type instead of a 182 * string, we check to see if it matches one of the historic 183 * filesystem types. 184 */ 185 fsindex = (u_long)SCARG(uap, type); 186 if (fsindex >= nvfssw || vfssw[fsindex] == NULL) { 187 vput(vp); 188 return (ENODEV); 189 } 190 strncpy(fstypename, vfssw[fsindex]->vfs_name, MFSNAMELEN); 191 #else 192 vput(vp); 193 return (error); 194 #endif 195 } 196 #ifdef COMPAT_10 197 /* Accept `ufs' as an alias for `ffs'. */ 198 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 199 strncpy(fstypename, "ffs", MFSNAMELEN); 200 #endif 201 for (fsindex = 0; fsindex < nvfssw; fsindex++) 202 if (vfssw[fsindex] != NULL && 203 !strncmp(vfssw[fsindex]->vfs_name, fstypename, MFSNAMELEN)) 204 break; 205 if (fsindex >= nvfssw) { 206 vput(vp); 207 return (ENODEV); 208 } 209 if (vp->v_mountedhere != NULL) { 210 vput(vp); 211 return (EBUSY); 212 } 213 214 /* 215 * Allocate and initialize the file system. 216 */ 217 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 218 M_MOUNT, M_WAITOK); 219 bzero((char *)mp, (u_long)sizeof(struct mount)); 220 mp->mnt_op = vfssw[fsindex]; 221 if ((error = vfs_lock(mp)) != 0) { 222 free((caddr_t)mp, M_MOUNT); 223 vput(vp); 224 return (error); 225 } 226 /* Do this early in case we block later. */ 227 vfssw[fsindex]->vfs_refcount++; 228 vp->v_mountedhere = mp; 229 mp->mnt_vnodecovered = vp; 230 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 231 update: 232 /* 233 * Set the mount level flags. 234 */ 235 if (SCARG(uap, flags) & MNT_RDONLY) 236 mp->mnt_flag |= MNT_RDONLY; 237 else if (mp->mnt_flag & MNT_RDONLY) 238 mp->mnt_flag |= MNT_WANTRDWR; 239 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 240 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 241 MNT_NOATIME); 242 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 243 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 244 MNT_NOCOREDUMP | MNT_NOATIME); 245 /* 246 * Mount the filesystem. 247 */ 248 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 249 if (mp->mnt_flag & MNT_UPDATE) { 250 vrele(vp); 251 if (mp->mnt_flag & MNT_WANTRDWR) 252 mp->mnt_flag &= ~MNT_RDONLY; 253 mp->mnt_flag &=~ 254 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 255 if (error) 256 mp->mnt_flag = flag; 257 return (error); 258 } 259 /* 260 * Put the new filesystem on the mount list after root. 261 */ 262 cache_purge(vp); 263 if (!error) { 264 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 265 checkdirs(vp); 266 VOP_UNLOCK(vp); 267 vfs_unlock(mp); 268 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 269 error = VFS_START(mp, 0, p); 270 } else { 271 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 272 vfssw[fsindex]->vfs_refcount--; 273 vfs_unlock(mp); 274 free((caddr_t)mp, M_MOUNT); 275 vput(vp); 276 } 277 return (error); 278 } 279 280 /* 281 * Scan all active processes to see if any of them have a current 282 * or root directory onto which the new filesystem has just been 283 * mounted. If so, replace them with the new mount point. 284 */ 285 void 286 checkdirs(olddp) 287 struct vnode *olddp; 288 { 289 struct filedesc *fdp; 290 struct vnode *newdp; 291 struct proc *p; 292 293 if (olddp->v_usecount == 1) 294 return; 295 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 296 panic("mount: lost mount"); 297 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 298 fdp = p->p_fd; 299 if (fdp->fd_cdir == olddp) { 300 vrele(fdp->fd_cdir); 301 VREF(newdp); 302 fdp->fd_cdir = newdp; 303 } 304 if (fdp->fd_rdir == olddp) { 305 vrele(fdp->fd_rdir); 306 VREF(newdp); 307 fdp->fd_rdir = newdp; 308 } 309 } 310 if (rootvnode == olddp) { 311 vrele(rootvnode); 312 VREF(newdp); 313 rootvnode = newdp; 314 } 315 vput(newdp); 316 } 317 318 /* 319 * Unmount a file system. 320 * 321 * Note: unmount takes a path to the vnode mounted on as argument, 322 * not special file (as before). 323 */ 324 /* ARGSUSED */ 325 int 326 sys_unmount(p, v, retval) 327 struct proc *p; 328 void *v; 329 register_t *retval; 330 { 331 register struct sys_unmount_args /* { 332 syscallarg(const char *) path; 333 syscallarg(int) flags; 334 } */ *uap = v; 335 register struct vnode *vp; 336 struct mount *mp; 337 int error; 338 struct nameidata nd; 339 340 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 341 SCARG(uap, path), p); 342 if ((error = namei(&nd)) != 0) 343 return (error); 344 vp = nd.ni_vp; 345 mp = vp->v_mount; 346 347 /* 348 * Only root, or the user that did the original mount is 349 * permitted to unmount this filesystem. 350 */ 351 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 352 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 353 vput(vp); 354 return (error); 355 } 356 357 /* 358 * Don't allow unmounting the root file system. 359 */ 360 if (mp->mnt_flag & MNT_ROOTFS) { 361 vput(vp); 362 return (EINVAL); 363 } 364 365 /* 366 * Must be the root of the filesystem 367 */ 368 if ((vp->v_flag & VROOT) == 0) { 369 vput(vp); 370 return (EINVAL); 371 } 372 vput(vp); 373 374 if (vfs_busy(mp)) 375 return (EBUSY); 376 377 return (dounmount(mp, SCARG(uap, flags), p)); 378 } 379 380 /* 381 * Do the actual file system unmount. File system is assumed to have been 382 * marked busy by the caller. 383 */ 384 int 385 dounmount(mp, flags, p) 386 register struct mount *mp; 387 int flags; 388 struct proc *p; 389 { 390 struct vnode *coveredvp; 391 int error; 392 393 coveredvp = mp->mnt_vnodecovered; 394 mp->mnt_flag |= MNT_UNMOUNT; 395 if ((error = vfs_lock(mp)) != 0) { 396 vfs_unbusy(mp); 397 return (error); 398 } 399 400 if (mp->mnt_flag & MNT_EXPUBLIC) 401 vfs_setpublicfs(NULL, NULL, NULL); 402 403 mp->mnt_flag &=~ MNT_ASYNC; 404 vnode_pager_umount(mp); /* release cached vnodes */ 405 cache_purgevfs(mp); /* remove cache entries for this file sys */ 406 if ((error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0 || 407 (flags & MNT_FORCE)) 408 error = VFS_UNMOUNT(mp, flags, p); 409 mp->mnt_flag &= ~MNT_UNMOUNT; 410 vfs_unbusy(mp); 411 if (error) { 412 vfs_unlock(mp); 413 } else { 414 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 415 if (coveredvp != NULLVP) { 416 vrele(coveredvp); 417 coveredvp->v_mountedhere = (struct mount *)0; 418 } 419 mp->mnt_op->vfs_refcount--; 420 vfs_unlock(mp); 421 if (mp->mnt_vnodelist.lh_first != NULL) 422 panic("unmount: dangling vnode"); 423 free((caddr_t)mp, M_MOUNT); 424 } 425 return (error); 426 } 427 428 /* 429 * Sync each mounted filesystem. 430 */ 431 #ifdef DEBUG 432 int syncprt = 0; 433 struct ctldebug debug0 = { "syncprt", &syncprt }; 434 #endif 435 436 /* ARGSUSED */ 437 int 438 sys_sync(p, v, retval) 439 struct proc *p; 440 void *v; 441 register_t *retval; 442 { 443 register struct mount *mp, *nmp; 444 int asyncflag; 445 446 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 447 /* 448 * Get the prev pointer in case we hang on vfs_busy 449 * while we are being unmounted. 450 */ 451 nmp = mp->mnt_list.cqe_prev; 452 /* 453 * The lock check below is to avoid races with mount 454 * and unmount. 455 */ 456 if ((mp->mnt_flag & (MNT_MLOCK|MNT_RDONLY|MNT_MPBUSY)) == 0 && 457 !vfs_busy(mp)) { 458 asyncflag = mp->mnt_flag & MNT_ASYNC; 459 mp->mnt_flag &= ~MNT_ASYNC; 460 vnode_pager_sync(mp); 461 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 462 if (asyncflag) 463 mp->mnt_flag |= MNT_ASYNC; 464 /* 465 * Get the prev pointer again, as the prior filesystem 466 * might have been unmounted while we were sync'ing. 467 */ 468 nmp = mp->mnt_list.cqe_prev; 469 vfs_unbusy(mp); 470 } 471 } 472 #ifdef DEBUG 473 if (syncprt) 474 vfs_bufstats(); 475 #endif /* DEBUG */ 476 return (0); 477 } 478 479 /* 480 * Change filesystem quotas. 481 */ 482 /* ARGSUSED */ 483 int 484 sys_quotactl(p, v, retval) 485 struct proc *p; 486 void *v; 487 register_t *retval; 488 { 489 register struct sys_quotactl_args /* { 490 syscallarg(const char *) path; 491 syscallarg(int) cmd; 492 syscallarg(int) uid; 493 syscallarg(caddr_t) arg; 494 } */ *uap = v; 495 register struct mount *mp; 496 int error; 497 struct nameidata nd; 498 499 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 500 if ((error = namei(&nd)) != 0) 501 return (error); 502 mp = nd.ni_vp->v_mount; 503 vrele(nd.ni_vp); 504 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 505 SCARG(uap, arg), p)); 506 } 507 508 /* 509 * Get filesystem statistics. 510 */ 511 /* ARGSUSED */ 512 int 513 sys_statfs(p, v, retval) 514 struct proc *p; 515 void *v; 516 register_t *retval; 517 { 518 register struct sys_statfs_args /* { 519 syscallarg(const char *) path; 520 syscallarg(struct statfs *) buf; 521 } */ *uap = v; 522 register struct mount *mp; 523 register struct statfs *sp; 524 int error; 525 struct nameidata nd; 526 527 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 528 if ((error = namei(&nd)) != 0) 529 return (error); 530 mp = nd.ni_vp->v_mount; 531 sp = &mp->mnt_stat; 532 vrele(nd.ni_vp); 533 if ((error = VFS_STATFS(mp, sp, p)) != 0) 534 return (error); 535 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 536 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 537 } 538 539 /* 540 * Get filesystem statistics. 541 */ 542 /* ARGSUSED */ 543 int 544 sys_fstatfs(p, v, retval) 545 struct proc *p; 546 void *v; 547 register_t *retval; 548 { 549 register struct sys_fstatfs_args /* { 550 syscallarg(int) fd; 551 syscallarg(struct statfs *) buf; 552 } */ *uap = v; 553 struct file *fp; 554 struct mount *mp; 555 register struct statfs *sp; 556 int error; 557 558 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 559 return (error); 560 mp = ((struct vnode *)fp->f_data)->v_mount; 561 sp = &mp->mnt_stat; 562 if ((error = VFS_STATFS(mp, sp, p)) != 0) 563 return (error); 564 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 565 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 566 } 567 568 /* 569 * Get statistics on all filesystems. 570 */ 571 int 572 sys_getfsstat(p, v, retval) 573 struct proc *p; 574 void *v; 575 register_t *retval; 576 { 577 register struct sys_getfsstat_args /* { 578 syscallarg(struct statfs *) buf; 579 syscallarg(long) bufsize; 580 syscallarg(int) flags; 581 } */ *uap = v; 582 register struct mount *mp, *nmp; 583 register struct statfs *sp; 584 caddr_t sfsp; 585 long count, maxcount, error; 586 587 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 588 sfsp = (caddr_t)SCARG(uap, buf); 589 for (count = 0, 590 mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 591 nmp = mp->mnt_list.cqe_next; 592 if (sfsp && count < maxcount && 593 ((mp->mnt_flag & MNT_MLOCK) == 0)) { 594 sp = &mp->mnt_stat; 595 /* 596 * If MNT_NOWAIT is specified, do not refresh the 597 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 598 */ 599 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 600 (SCARG(uap, flags) & MNT_WAIT)) && 601 (error = VFS_STATFS(mp, sp, p)) != 0) 602 continue; 603 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 604 error = copyout(sp, sfsp, sizeof(*sp)); 605 if (error) 606 return (error); 607 sfsp += sizeof(*sp); 608 } 609 count++; 610 } 611 if (sfsp && count > maxcount) 612 *retval = maxcount; 613 else 614 *retval = count; 615 return (0); 616 } 617 618 /* 619 * Change current working directory to a given file descriptor. 620 */ 621 /* ARGSUSED */ 622 int 623 sys_fchdir(p, v, retval) 624 struct proc *p; 625 void *v; 626 register_t *retval; 627 { 628 struct sys_fchdir_args /* { 629 syscallarg(int) fd; 630 } */ *uap = v; 631 register struct filedesc *fdp = p->p_fd; 632 struct vnode *vp, *tdp; 633 struct mount *mp; 634 struct file *fp; 635 int error; 636 637 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 638 return (error); 639 vp = (struct vnode *)fp->f_data; 640 VREF(vp); 641 VOP_LOCK(vp); 642 if (vp->v_type != VDIR) 643 error = ENOTDIR; 644 else 645 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 646 while (!error && (mp = vp->v_mountedhere) != NULL) { 647 if (mp->mnt_flag & MNT_MLOCK) { 648 mp->mnt_flag |= MNT_MWAIT; 649 sleep((caddr_t)mp, PVFS); 650 continue; 651 } 652 if ((error = VFS_ROOT(mp, &tdp)) != 0) 653 break; 654 vput(vp); 655 vp = tdp; 656 } 657 VOP_UNLOCK(vp); 658 if (error) { 659 vrele(vp); 660 return (error); 661 } 662 vrele(fdp->fd_cdir); 663 fdp->fd_cdir = vp; 664 return (0); 665 } 666 667 /* 668 * Change current working directory (``.''). 669 */ 670 /* ARGSUSED */ 671 int 672 sys_chdir(p, v, retval) 673 struct proc *p; 674 void *v; 675 register_t *retval; 676 { 677 struct sys_chdir_args /* { 678 syscallarg(const char *) path; 679 } */ *uap = v; 680 register struct filedesc *fdp = p->p_fd; 681 int error; 682 struct nameidata nd; 683 684 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 685 SCARG(uap, path), p); 686 if ((error = change_dir(&nd, p)) != 0) 687 return (error); 688 vrele(fdp->fd_cdir); 689 fdp->fd_cdir = nd.ni_vp; 690 return (0); 691 } 692 693 /* 694 * Change notion of root (``/'') directory. 695 */ 696 /* ARGSUSED */ 697 int 698 sys_chroot(p, v, retval) 699 struct proc *p; 700 void *v; 701 register_t *retval; 702 { 703 struct sys_chroot_args /* { 704 syscallarg(const char *) path; 705 } */ *uap = v; 706 register struct filedesc *fdp = p->p_fd; 707 int error; 708 struct nameidata nd; 709 710 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 711 return (error); 712 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 713 SCARG(uap, path), p); 714 if ((error = change_dir(&nd, p)) != 0) 715 return (error); 716 if (fdp->fd_rdir != NULL) 717 vrele(fdp->fd_rdir); 718 fdp->fd_rdir = nd.ni_vp; 719 return (0); 720 } 721 722 /* 723 * Common routine for chroot and chdir. 724 */ 725 static int 726 change_dir(ndp, p) 727 register struct nameidata *ndp; 728 struct proc *p; 729 { 730 struct vnode *vp; 731 int error; 732 733 if ((error = namei(ndp)) != 0) 734 return (error); 735 vp = ndp->ni_vp; 736 if (vp->v_type != VDIR) 737 error = ENOTDIR; 738 else 739 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 740 VOP_UNLOCK(vp); 741 if (error) 742 vrele(vp); 743 return (error); 744 } 745 746 /* 747 * Check permissions, allocate an open file structure, 748 * and call the device open routine if any. 749 */ 750 int 751 sys_open(p, v, retval) 752 struct proc *p; 753 void *v; 754 register_t *retval; 755 { 756 register struct sys_open_args /* { 757 syscallarg(const char *) path; 758 syscallarg(int) flags; 759 syscallarg(int) mode; 760 } */ *uap = v; 761 register struct filedesc *fdp = p->p_fd; 762 register struct file *fp; 763 register struct vnode *vp; 764 int flags, cmode; 765 struct file *nfp; 766 int type, indx, error; 767 struct flock lf; 768 struct nameidata nd; 769 extern struct fileops vnops; 770 771 if ((error = falloc(p, &nfp, &indx)) != 0) 772 return (error); 773 fp = nfp; 774 flags = FFLAGS(SCARG(uap, flags)); 775 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 776 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 777 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 778 if ((error = vn_open(&nd, flags, cmode)) != 0) { 779 ffree(fp); 780 if ((error == ENODEV || error == ENXIO) && 781 p->p_dupfd >= 0 && /* XXX from fdopen */ 782 (error = 783 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 784 *retval = indx; 785 return (0); 786 } 787 if (error == ERESTART) 788 error = EINTR; 789 fdp->fd_ofiles[indx] = NULL; 790 return (error); 791 } 792 p->p_dupfd = 0; 793 vp = nd.ni_vp; 794 fp->f_flag = flags & FMASK; 795 fp->f_type = DTYPE_VNODE; 796 fp->f_ops = &vnops; 797 fp->f_data = (caddr_t)vp; 798 if (flags & (O_EXLOCK | O_SHLOCK)) { 799 lf.l_whence = SEEK_SET; 800 lf.l_start = 0; 801 lf.l_len = 0; 802 if (flags & O_EXLOCK) 803 lf.l_type = F_WRLCK; 804 else 805 lf.l_type = F_RDLCK; 806 type = F_FLOCK; 807 if ((flags & FNONBLOCK) == 0) 808 type |= F_WAIT; 809 VOP_UNLOCK(vp); 810 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 811 if (error) { 812 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 813 ffree(fp); 814 fdp->fd_ofiles[indx] = NULL; 815 return (error); 816 } 817 VOP_LOCK(vp); 818 fp->f_flag |= FHASLOCK; 819 } 820 VOP_UNLOCK(vp); 821 *retval = indx; 822 return (0); 823 } 824 825 /* 826 * Create a special file. 827 */ 828 /* ARGSUSED */ 829 int 830 sys_mknod(p, v, retval) 831 struct proc *p; 832 void *v; 833 register_t *retval; 834 { 835 register struct sys_mknod_args /* { 836 syscallarg(const char *) path; 837 syscallarg(int) mode; 838 syscallarg(int) dev; 839 } */ *uap = v; 840 register struct vnode *vp; 841 struct vattr vattr; 842 int error; 843 int whiteout = 0; 844 struct nameidata nd; 845 846 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 847 return (error); 848 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 849 if ((error = namei(&nd)) != 0) 850 return (error); 851 vp = nd.ni_vp; 852 if (vp != NULL) 853 error = EEXIST; 854 else { 855 VATTR_NULL(&vattr); 856 vattr.va_mode = 857 (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 858 vattr.va_rdev = SCARG(uap, dev); 859 whiteout = 0; 860 861 switch (SCARG(uap, mode) & S_IFMT) { 862 case S_IFMT: /* used by badsect to flag bad sectors */ 863 vattr.va_type = VBAD; 864 break; 865 case S_IFCHR: 866 vattr.va_type = VCHR; 867 break; 868 case S_IFBLK: 869 vattr.va_type = VBLK; 870 break; 871 case S_IFWHT: 872 whiteout = 1; 873 break; 874 default: 875 error = EINVAL; 876 break; 877 } 878 } 879 if (!error) { 880 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 881 if (whiteout) { 882 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 883 if (error) 884 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 885 vput(nd.ni_dvp); 886 } else { 887 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 888 &nd.ni_cnd, &vattr); 889 } 890 } else { 891 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 892 if (nd.ni_dvp == vp) 893 vrele(nd.ni_dvp); 894 else 895 vput(nd.ni_dvp); 896 if (vp) 897 vrele(vp); 898 } 899 return (error); 900 } 901 902 /* 903 * Create a named pipe. 904 */ 905 /* ARGSUSED */ 906 int 907 sys_mkfifo(p, v, retval) 908 struct proc *p; 909 void *v; 910 register_t *retval; 911 { 912 #ifndef FIFO 913 return (EOPNOTSUPP); 914 #else 915 register struct sys_mkfifo_args /* { 916 syscallarg(const char *) path; 917 syscallarg(int) mode; 918 } */ *uap = v; 919 struct vattr vattr; 920 int error; 921 struct nameidata nd; 922 923 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 924 if ((error = namei(&nd)) != 0) 925 return (error); 926 if (nd.ni_vp != NULL) { 927 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 928 if (nd.ni_dvp == nd.ni_vp) 929 vrele(nd.ni_dvp); 930 else 931 vput(nd.ni_dvp); 932 vrele(nd.ni_vp); 933 return (EEXIST); 934 } 935 VATTR_NULL(&vattr); 936 vattr.va_type = VFIFO; 937 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 938 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 939 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 940 #endif /* FIFO */ 941 } 942 943 /* 944 * Make a hard file link. 945 */ 946 /* ARGSUSED */ 947 int 948 sys_link(p, v, retval) 949 struct proc *p; 950 void *v; 951 register_t *retval; 952 { 953 register struct sys_link_args /* { 954 syscallarg(const char *) path; 955 syscallarg(const char *) link; 956 } */ *uap = v; 957 register struct vnode *vp; 958 struct nameidata nd; 959 int error; 960 961 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 962 if ((error = namei(&nd)) != 0) 963 return (error); 964 vp = nd.ni_vp; 965 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 966 if ((error = namei(&nd)) != 0) 967 goto out; 968 if (nd.ni_vp) { 969 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 970 if (nd.ni_dvp == nd.ni_vp) 971 vrele(nd.ni_dvp); 972 else 973 vput(nd.ni_dvp); 974 vrele(nd.ni_vp); 975 error = EEXIST; 976 goto out; 977 } 978 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 979 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 980 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 981 out: 982 vrele(vp); 983 return (error); 984 } 985 986 /* 987 * Make a symbolic link. 988 */ 989 /* ARGSUSED */ 990 int 991 sys_symlink(p, v, retval) 992 struct proc *p; 993 void *v; 994 register_t *retval; 995 { 996 register struct sys_symlink_args /* { 997 syscallarg(const char *) path; 998 syscallarg(const char *) link; 999 } */ *uap = v; 1000 struct vattr vattr; 1001 char *path; 1002 int error; 1003 struct nameidata nd; 1004 1005 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1006 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1007 if (error) 1008 goto out; 1009 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1010 if ((error = namei(&nd)) != 0) 1011 goto out; 1012 if (nd.ni_vp) { 1013 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1014 if (nd.ni_dvp == nd.ni_vp) 1015 vrele(nd.ni_dvp); 1016 else 1017 vput(nd.ni_dvp); 1018 vrele(nd.ni_vp); 1019 error = EEXIST; 1020 goto out; 1021 } 1022 VATTR_NULL(&vattr); 1023 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1024 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1025 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1026 out: 1027 FREE(path, M_NAMEI); 1028 return (error); 1029 } 1030 1031 /* 1032 * Delete a whiteout from the filesystem. 1033 */ 1034 /* ARGSUSED */ 1035 int 1036 sys_undelete(p, v, retval) 1037 struct proc *p; 1038 void *v; 1039 register_t *retval; 1040 { 1041 register struct sys_undelete_args /* { 1042 syscallarg(const char *) path; 1043 } */ *uap = v; 1044 int error; 1045 struct nameidata nd; 1046 1047 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1048 SCARG(uap, path), p); 1049 error = namei(&nd); 1050 if (error) 1051 return (error); 1052 1053 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1054 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1055 if (nd.ni_dvp == nd.ni_vp) 1056 vrele(nd.ni_dvp); 1057 else 1058 vput(nd.ni_dvp); 1059 if (nd.ni_vp) 1060 vrele(nd.ni_vp); 1061 return (EEXIST); 1062 } 1063 1064 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1065 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1066 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1067 vput(nd.ni_dvp); 1068 return (error); 1069 } 1070 1071 /* 1072 * Delete a name from the filesystem. 1073 */ 1074 /* ARGSUSED */ 1075 int 1076 sys_unlink(p, v, retval) 1077 struct proc *p; 1078 void *v; 1079 register_t *retval; 1080 { 1081 struct sys_unlink_args /* { 1082 syscallarg(const char *) path; 1083 } */ *uap = v; 1084 register struct vnode *vp; 1085 int error; 1086 struct nameidata nd; 1087 1088 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1089 SCARG(uap, path), p); 1090 if ((error = namei(&nd)) != 0) 1091 return (error); 1092 vp = nd.ni_vp; 1093 1094 /* 1095 * The root of a mounted filesystem cannot be deleted. 1096 */ 1097 if (vp->v_flag & VROOT) { 1098 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1099 if (nd.ni_dvp == vp) 1100 vrele(nd.ni_dvp); 1101 else 1102 vput(nd.ni_dvp); 1103 vput(vp); 1104 error = EBUSY; 1105 goto out; 1106 } 1107 1108 (void)vnode_pager_uncache(vp); 1109 1110 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1111 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1112 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1113 out: 1114 return (error); 1115 } 1116 1117 /* 1118 * Reposition read/write file offset. 1119 */ 1120 int 1121 sys_lseek(p, v, retval) 1122 struct proc *p; 1123 void *v; 1124 register_t *retval; 1125 { 1126 register struct sys_lseek_args /* { 1127 syscallarg(int) fd; 1128 syscallarg(int) pad; 1129 syscallarg(off_t) offset; 1130 syscallarg(int) whence; 1131 } */ *uap = v; 1132 struct ucred *cred = p->p_ucred; 1133 register struct filedesc *fdp = p->p_fd; 1134 register struct file *fp; 1135 struct vnode *vp; 1136 struct vattr vattr; 1137 register off_t newoff; 1138 int error; 1139 1140 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1141 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1142 return (EBADF); 1143 1144 vp = (struct vnode *)fp->f_data; 1145 if (fp->f_type != DTYPE_VNODE 1146 #ifdef FIFO 1147 || vp->v_type == VFIFO 1148 #endif 1149 ) 1150 return (ESPIPE); 1151 1152 switch (SCARG(uap, whence)) { 1153 case SEEK_CUR: 1154 newoff = fp->f_offset + SCARG(uap, offset); 1155 break; 1156 case SEEK_END: 1157 error = VOP_GETATTR(vp, &vattr, cred, p); 1158 if (error) 1159 return (error); 1160 newoff = SCARG(uap, offset) + vattr.va_size; 1161 break; 1162 case SEEK_SET: 1163 newoff = SCARG(uap, offset); 1164 break; 1165 default: 1166 return (EINVAL); 1167 } 1168 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1169 return (error); 1170 1171 *(off_t *)retval = fp->f_offset = newoff; 1172 return (0); 1173 } 1174 1175 /* 1176 * Check access permissions. 1177 */ 1178 int 1179 sys_access(p, v, retval) 1180 struct proc *p; 1181 void *v; 1182 register_t *retval; 1183 { 1184 register struct sys_access_args /* { 1185 syscallarg(const char *) path; 1186 syscallarg(int) flags; 1187 } */ *uap = v; 1188 register struct ucred *cred = p->p_ucred; 1189 register struct vnode *vp; 1190 int error, flags, t_gid, t_uid; 1191 struct nameidata nd; 1192 1193 t_uid = cred->cr_uid; 1194 t_gid = cred->cr_gid; 1195 cred->cr_uid = p->p_cred->p_ruid; 1196 cred->cr_gid = p->p_cred->p_rgid; 1197 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1198 SCARG(uap, path), p); 1199 if ((error = namei(&nd)) != 0) 1200 goto out1; 1201 vp = nd.ni_vp; 1202 1203 /* Flags == 0 means only check for existence. */ 1204 if (SCARG(uap, flags)) { 1205 flags = 0; 1206 if (SCARG(uap, flags) & R_OK) 1207 flags |= VREAD; 1208 if (SCARG(uap, flags) & W_OK) 1209 flags |= VWRITE; 1210 if (SCARG(uap, flags) & X_OK) 1211 flags |= VEXEC; 1212 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1213 error = VOP_ACCESS(vp, flags, cred, p); 1214 } 1215 vput(vp); 1216 out1: 1217 cred->cr_uid = t_uid; 1218 cred->cr_gid = t_gid; 1219 return (error); 1220 } 1221 1222 /* 1223 * Get file status; this version follows links. 1224 */ 1225 /* ARGSUSED */ 1226 int 1227 sys_stat(p, v, retval) 1228 struct proc *p; 1229 void *v; 1230 register_t *retval; 1231 { 1232 register struct sys_stat_args /* { 1233 syscallarg(const char *) path; 1234 syscallarg(struct stat *) ub; 1235 } */ *uap = v; 1236 struct stat sb; 1237 int error; 1238 struct nameidata nd; 1239 1240 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1241 SCARG(uap, path), p); 1242 if ((error = namei(&nd)) != 0) 1243 return (error); 1244 error = vn_stat(nd.ni_vp, &sb, p); 1245 vput(nd.ni_vp); 1246 if (error) 1247 return (error); 1248 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1249 return (error); 1250 } 1251 1252 /* 1253 * Get file status; this version does not follow links. 1254 */ 1255 /* ARGSUSED */ 1256 int 1257 sys_lstat(p, v, retval) 1258 struct proc *p; 1259 void *v; 1260 register_t *retval; 1261 { 1262 register struct sys_lstat_args /* { 1263 syscallarg(const char *) path; 1264 syscallarg(struct stat *) ub; 1265 } */ *uap = v; 1266 struct stat sb; 1267 int error; 1268 struct nameidata nd; 1269 1270 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1271 SCARG(uap, path), p); 1272 if ((error = namei(&nd)) != 0) 1273 return (error); 1274 error = vn_stat(nd.ni_vp, &sb, p); 1275 vput(nd.ni_vp); 1276 if (error) 1277 return (error); 1278 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1279 return (error); 1280 } 1281 1282 /* 1283 * Get configurable pathname variables. 1284 */ 1285 /* ARGSUSED */ 1286 int 1287 sys_pathconf(p, v, retval) 1288 struct proc *p; 1289 void *v; 1290 register_t *retval; 1291 { 1292 register struct sys_pathconf_args /* { 1293 syscallarg(const char *) path; 1294 syscallarg(int) name; 1295 } */ *uap = v; 1296 int error; 1297 struct nameidata nd; 1298 1299 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1300 SCARG(uap, path), p); 1301 if ((error = namei(&nd)) != 0) 1302 return (error); 1303 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1304 vput(nd.ni_vp); 1305 return (error); 1306 } 1307 1308 /* 1309 * Return target name of a symbolic link. 1310 */ 1311 /* ARGSUSED */ 1312 int 1313 sys_readlink(p, v, retval) 1314 struct proc *p; 1315 void *v; 1316 register_t *retval; 1317 { 1318 register struct sys_readlink_args /* { 1319 syscallarg(const char *) path; 1320 syscallarg(char *) buf; 1321 syscallarg(int) count; 1322 } */ *uap = v; 1323 register struct vnode *vp; 1324 struct iovec aiov; 1325 struct uio auio; 1326 int error; 1327 struct nameidata nd; 1328 1329 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1330 SCARG(uap, path), p); 1331 if ((error = namei(&nd)) != 0) 1332 return (error); 1333 vp = nd.ni_vp; 1334 if (vp->v_type != VLNK) 1335 error = EINVAL; 1336 else { 1337 aiov.iov_base = SCARG(uap, buf); 1338 aiov.iov_len = SCARG(uap, count); 1339 auio.uio_iov = &aiov; 1340 auio.uio_iovcnt = 1; 1341 auio.uio_offset = 0; 1342 auio.uio_rw = UIO_READ; 1343 auio.uio_segflg = UIO_USERSPACE; 1344 auio.uio_procp = p; 1345 auio.uio_resid = SCARG(uap, count); 1346 error = VOP_READLINK(vp, &auio, p->p_ucred); 1347 } 1348 vput(vp); 1349 *retval = SCARG(uap, count) - auio.uio_resid; 1350 return (error); 1351 } 1352 1353 /* 1354 * Change flags of a file given a path name. 1355 */ 1356 /* ARGSUSED */ 1357 int 1358 sys_chflags(p, v, retval) 1359 struct proc *p; 1360 void *v; 1361 register_t *retval; 1362 { 1363 register struct sys_chflags_args /* { 1364 syscallarg(const char *) path; 1365 syscallarg(u_long) flags; 1366 } */ *uap = v; 1367 register struct vnode *vp; 1368 struct vattr vattr; 1369 int error; 1370 struct nameidata nd; 1371 1372 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1373 if ((error = namei(&nd)) != 0) 1374 return (error); 1375 vp = nd.ni_vp; 1376 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1377 VOP_LOCK(vp); 1378 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1379 error = EROFS; 1380 else { 1381 VATTR_NULL(&vattr); 1382 vattr.va_flags = SCARG(uap, flags); 1383 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1384 } 1385 vput(vp); 1386 return (error); 1387 } 1388 1389 /* 1390 * Change flags of a file given a file descriptor. 1391 */ 1392 /* ARGSUSED */ 1393 int 1394 sys_fchflags(p, v, retval) 1395 struct proc *p; 1396 void *v; 1397 register_t *retval; 1398 { 1399 register struct sys_fchflags_args /* { 1400 syscallarg(int) fd; 1401 syscallarg(u_long) flags; 1402 } */ *uap = v; 1403 struct vattr vattr; 1404 struct vnode *vp; 1405 struct file *fp; 1406 int error; 1407 1408 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1409 return (error); 1410 vp = (struct vnode *)fp->f_data; 1411 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1412 VOP_LOCK(vp); 1413 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1414 error = EROFS; 1415 else { 1416 VATTR_NULL(&vattr); 1417 vattr.va_flags = SCARG(uap, flags); 1418 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1419 } 1420 VOP_UNLOCK(vp); 1421 return (error); 1422 } 1423 1424 /* 1425 * Change mode of a file given path name; this version follows links. 1426 */ 1427 /* ARGSUSED */ 1428 int 1429 sys_chmod(p, v, retval) 1430 struct proc *p; 1431 void *v; 1432 register_t *retval; 1433 { 1434 register struct sys_chmod_args /* { 1435 syscallarg(const char *) path; 1436 syscallarg(int) mode; 1437 } */ *uap = v; 1438 int error; 1439 struct nameidata nd; 1440 1441 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1442 if ((error = namei(&nd)) != 0) 1443 return (error); 1444 1445 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1446 1447 vrele(nd.ni_vp); 1448 return (error); 1449 } 1450 1451 /* 1452 * Change mode of a file given a file descriptor. 1453 */ 1454 /* ARGSUSED */ 1455 int 1456 sys_fchmod(p, v, retval) 1457 struct proc *p; 1458 void *v; 1459 register_t *retval; 1460 { 1461 register struct sys_fchmod_args /* { 1462 syscallarg(int) fd; 1463 syscallarg(int) mode; 1464 } */ *uap = v; 1465 struct file *fp; 1466 int error; 1467 1468 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1469 return (error); 1470 1471 return (change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p)); 1472 } 1473 1474 /* 1475 * Change mode of a file given path name; this version does not follow links. 1476 */ 1477 /* ARGSUSED */ 1478 int 1479 sys_lchmod(p, v, retval) 1480 struct proc *p; 1481 void *v; 1482 register_t *retval; 1483 { 1484 register struct sys_lchmod_args /* { 1485 syscallarg(const char *) path; 1486 syscallarg(int) mode; 1487 } */ *uap = v; 1488 int error; 1489 struct nameidata nd; 1490 1491 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1492 if ((error = namei(&nd)) != 0) 1493 return (error); 1494 1495 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1496 1497 vrele(nd.ni_vp); 1498 return (error); 1499 } 1500 1501 /* 1502 * Common routine to set mode given a vnode. 1503 */ 1504 static int 1505 change_mode(vp, mode, p) 1506 struct vnode *vp; 1507 int mode; 1508 struct proc *p; 1509 { 1510 struct vattr vattr; 1511 int error; 1512 1513 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1514 VOP_LOCK(vp); 1515 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1516 error = EROFS; 1517 else { 1518 VATTR_NULL(&vattr); 1519 vattr.va_mode = mode & ALLPERMS; 1520 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1521 } 1522 VOP_UNLOCK(vp); 1523 return (error); 1524 } 1525 1526 /* 1527 * Set ownership given a path name; this version follows links. 1528 */ 1529 /* ARGSUSED */ 1530 int 1531 sys_chown(p, v, retval) 1532 struct proc *p; 1533 void *v; 1534 register_t *retval; 1535 { 1536 register struct sys_chown_args /* { 1537 syscallarg(const char *) path; 1538 syscallarg(uid_t) uid; 1539 syscallarg(gid_t) gid; 1540 } */ *uap = v; 1541 int error; 1542 struct nameidata nd; 1543 1544 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1545 if ((error = namei(&nd)) != 0) 1546 return (error); 1547 1548 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p); 1549 1550 vrele(nd.ni_vp); 1551 return (error); 1552 } 1553 1554 /* 1555 * Set ownership given a file descriptor. 1556 */ 1557 /* ARGSUSED */ 1558 int 1559 sys_fchown(p, v, retval) 1560 struct proc *p; 1561 void *v; 1562 register_t *retval; 1563 { 1564 register struct sys_fchown_args /* { 1565 syscallarg(int) fd; 1566 syscallarg(uid_t) uid; 1567 syscallarg(gid_t) gid; 1568 } */ *uap = v; 1569 int error; 1570 struct file *fp; 1571 1572 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1573 return (error); 1574 1575 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1576 SCARG(uap, gid), p)); 1577 } 1578 1579 /* 1580 * Set ownership given a path name; this version does not follow links. 1581 */ 1582 /* ARGSUSED */ 1583 int 1584 sys_lchown(p, v, retval) 1585 struct proc *p; 1586 void *v; 1587 register_t *retval; 1588 { 1589 register struct sys_lchown_args /* { 1590 syscallarg(const char *) path; 1591 syscallarg(uid_t) uid; 1592 syscallarg(gid_t) gid; 1593 } */ *uap = v; 1594 int error; 1595 struct nameidata nd; 1596 1597 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1598 if ((error = namei(&nd)) != 0) 1599 return (error); 1600 1601 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p); 1602 1603 vrele(nd.ni_vp); 1604 return (error); 1605 } 1606 1607 /* 1608 * Common routine to set ownership given a vnode. 1609 */ 1610 static int 1611 change_owner(vp, uid, gid, p) 1612 register struct vnode *vp; 1613 uid_t uid; 1614 gid_t gid; 1615 struct proc *p; 1616 { 1617 struct vattr vattr; 1618 mode_t newmode = VNOVAL; 1619 int error; 1620 1621 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1622 VOP_LOCK(vp); 1623 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 1624 error = EROFS; 1625 goto out; 1626 } 1627 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 1628 goto out; 1629 1630 /* Clear (S_ISUID | S_ISGID) bits: alter va_mode only if necessary. */ 1631 if (vattr.va_mode & (S_ISUID | S_ISGID)) 1632 newmode = vattr.va_mode & ~(S_ISUID | S_ISGID); 1633 1634 VATTR_NULL(&vattr); 1635 vattr.va_uid = uid; 1636 vattr.va_gid = gid; 1637 vattr.va_mode = newmode; 1638 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1639 1640 out: 1641 VOP_UNLOCK(vp); 1642 return (error); 1643 } 1644 1645 /* 1646 * Set the access and modification times given a path name; this 1647 * version follows links. 1648 */ 1649 /* ARGSUSED */ 1650 int 1651 sys_utimes(p, v, retval) 1652 struct proc *p; 1653 void *v; 1654 register_t *retval; 1655 { 1656 register struct sys_utimes_args /* { 1657 syscallarg(const char *) path; 1658 syscallarg(const struct timeval *) tptr; 1659 } */ *uap = v; 1660 int error; 1661 struct nameidata nd; 1662 1663 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1664 if ((error = namei(&nd)) != 0) 1665 return (error); 1666 1667 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1668 1669 vrele(nd.ni_vp); 1670 return (error); 1671 } 1672 1673 /* 1674 * Set the access and modification times given a file descriptor. 1675 */ 1676 /* ARGSUSED */ 1677 int 1678 sys_futimes(p, v, retval) 1679 struct proc *p; 1680 void *v; 1681 register_t *retval; 1682 { 1683 register struct sys_futimes_args /* { 1684 syscallarg(int) fd; 1685 syscallarg(const struct timeval *) tptr; 1686 } */ *uap = v; 1687 int error; 1688 struct file *fp; 1689 1690 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1691 return (error); 1692 1693 return (change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), 1694 p)); 1695 } 1696 1697 /* 1698 * Set the access and modification times given a path name; this 1699 * version does not follow links. 1700 */ 1701 /* ARGSUSED */ 1702 int 1703 sys_lutimes(p, v, retval) 1704 struct proc *p; 1705 void *v; 1706 register_t *retval; 1707 { 1708 register struct sys_lutimes_args /* { 1709 syscallarg(const char *) path; 1710 syscallarg(const struct timeval *) tptr; 1711 } */ *uap = v; 1712 int error; 1713 struct nameidata nd; 1714 1715 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1716 if ((error = namei(&nd)) != 0) 1717 return (error); 1718 1719 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1720 1721 vrele(nd.ni_vp); 1722 return (error); 1723 } 1724 1725 /* 1726 * Common routine to set access and modification times given a vnode. 1727 */ 1728 static int 1729 change_utimes(vp, tptr, p) 1730 struct vnode *vp; 1731 const struct timeval *tptr; 1732 struct proc *p; 1733 { 1734 struct timeval tv[2]; 1735 struct vattr vattr; 1736 int error; 1737 1738 VATTR_NULL(&vattr); 1739 if (tptr == NULL) { 1740 microtime(&tv[0]); 1741 tv[1] = tv[0]; 1742 vattr.va_vaflags |= VA_UTIMES_NULL; 1743 } else { 1744 error = copyin(tptr, tv, sizeof (tv)); 1745 if (error) 1746 return (error); 1747 } 1748 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1749 VOP_LOCK(vp); 1750 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1751 error = EROFS; 1752 else { 1753 vattr.va_atime.tv_sec = tv[0].tv_sec; 1754 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1755 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1756 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1757 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1758 } 1759 VOP_UNLOCK(vp); 1760 return (error); 1761 } 1762 1763 /* 1764 * Truncate a file given its path name. 1765 */ 1766 /* ARGSUSED */ 1767 int 1768 sys_truncate(p, v, retval) 1769 struct proc *p; 1770 void *v; 1771 register_t *retval; 1772 { 1773 register struct sys_truncate_args /* { 1774 syscallarg(const char *) path; 1775 syscallarg(int) pad; 1776 syscallarg(off_t) length; 1777 } */ *uap = v; 1778 register struct vnode *vp; 1779 struct vattr vattr; 1780 int error; 1781 struct nameidata nd; 1782 1783 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1784 if ((error = namei(&nd)) != 0) 1785 return (error); 1786 vp = nd.ni_vp; 1787 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1788 VOP_LOCK(vp); 1789 if (vp->v_type == VDIR) 1790 error = EISDIR; 1791 else if ((error = vn_writechk(vp)) == 0 && 1792 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1793 VATTR_NULL(&vattr); 1794 vattr.va_size = SCARG(uap, length); 1795 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1796 } 1797 vput(vp); 1798 return (error); 1799 } 1800 1801 /* 1802 * Truncate a file given a file descriptor. 1803 */ 1804 /* ARGSUSED */ 1805 int 1806 sys_ftruncate(p, v, retval) 1807 struct proc *p; 1808 void *v; 1809 register_t *retval; 1810 { 1811 register struct sys_ftruncate_args /* { 1812 syscallarg(int) fd; 1813 syscallarg(int) pad; 1814 syscallarg(off_t) length; 1815 } */ *uap = v; 1816 struct vattr vattr; 1817 struct vnode *vp; 1818 struct file *fp; 1819 int error; 1820 1821 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1822 return (error); 1823 if ((fp->f_flag & FWRITE) == 0) 1824 return (EINVAL); 1825 vp = (struct vnode *)fp->f_data; 1826 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1827 VOP_LOCK(vp); 1828 if (vp->v_type == VDIR) 1829 error = EISDIR; 1830 else if ((error = vn_writechk(vp)) == 0) { 1831 VATTR_NULL(&vattr); 1832 vattr.va_size = SCARG(uap, length); 1833 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1834 } 1835 VOP_UNLOCK(vp); 1836 return (error); 1837 } 1838 1839 /* 1840 * Sync an open file. 1841 */ 1842 /* ARGSUSED */ 1843 int 1844 sys_fsync(p, v, retval) 1845 struct proc *p; 1846 void *v; 1847 register_t *retval; 1848 { 1849 struct sys_fsync_args /* { 1850 syscallarg(int) fd; 1851 } */ *uap = v; 1852 register struct vnode *vp; 1853 struct file *fp; 1854 int error; 1855 1856 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1857 return (error); 1858 vp = (struct vnode *)fp->f_data; 1859 VOP_LOCK(vp); 1860 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p); 1861 VOP_UNLOCK(vp); 1862 return (error); 1863 } 1864 1865 /* 1866 * Rename files, (standard) BSD semantics frontend. 1867 */ 1868 /* ARGSUSED */ 1869 int 1870 sys_rename(p, v, retval) 1871 struct proc *p; 1872 void *v; 1873 register_t *retval; 1874 { 1875 register struct sys_rename_args /* { 1876 syscallarg(const char *) from; 1877 syscallarg(const char *) to; 1878 } */ *uap = v; 1879 1880 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 1881 } 1882 1883 /* 1884 * Rename files, POSIX semantics frontend. 1885 */ 1886 /* ARGSUSED */ 1887 int 1888 sys_posix_rename(p, v, retval) 1889 struct proc *p; 1890 void *v; 1891 register_t *retval; 1892 { 1893 register struct sys_posix_rename_args /* { 1894 syscallarg(const char *) from; 1895 syscallarg(const char *) to; 1896 } */ *uap = v; 1897 1898 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 1899 } 1900 1901 /* 1902 * Rename files. Source and destination must either both be directories, 1903 * or both not be directories. If target is a directory, it must be empty. 1904 * If `from' and `to' refer to the same object, the value of the `retain' 1905 * argument is used to determine whether `from' will be 1906 * 1907 * (retain == 0) deleted unless `from' and `to' refer to the same 1908 * object in the file system's name space (BSD). 1909 * (retain == 1) always retained (POSIX). 1910 */ 1911 static int 1912 rename_files(from, to, p, retain) 1913 const char *from, *to; 1914 struct proc *p; 1915 int retain; 1916 { 1917 register struct vnode *tvp, *fvp, *tdvp; 1918 struct nameidata fromnd, tond; 1919 int error; 1920 1921 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 1922 from, p); 1923 if ((error = namei(&fromnd)) != 0) 1924 return (error); 1925 fvp = fromnd.ni_vp; 1926 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 1927 UIO_USERSPACE, to, p); 1928 if ((error = namei(&tond)) != 0) { 1929 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1930 vrele(fromnd.ni_dvp); 1931 vrele(fvp); 1932 goto out1; 1933 } 1934 tdvp = tond.ni_dvp; 1935 tvp = tond.ni_vp; 1936 1937 if (tvp != NULL) { 1938 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 1939 error = ENOTDIR; 1940 goto out; 1941 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 1942 error = EISDIR; 1943 goto out; 1944 } 1945 } 1946 1947 if (fvp == tdvp) 1948 error = EINVAL; 1949 1950 /* 1951 * Source and destination refer to the same object. 1952 */ 1953 if (fvp == tvp) { 1954 if (retain) 1955 error = -1; 1956 else if (fromnd.ni_dvp == tdvp && 1957 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 1958 !bcmp(fromnd.ni_cnd.cn_nameptr, 1959 tond.ni_cnd.cn_nameptr, 1960 fromnd.ni_cnd.cn_namelen)) 1961 error = -1; 1962 } 1963 1964 out: 1965 if (!error) { 1966 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 1967 if (fromnd.ni_dvp != tdvp) 1968 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1969 if (tvp) { 1970 (void)vnode_pager_uncache(tvp); 1971 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 1972 } 1973 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 1974 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 1975 } else { 1976 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 1977 if (tdvp == tvp) 1978 vrele(tdvp); 1979 else 1980 vput(tdvp); 1981 if (tvp) 1982 vput(tvp); 1983 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1984 vrele(fromnd.ni_dvp); 1985 vrele(fvp); 1986 } 1987 vrele(tond.ni_startdir); 1988 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 1989 out1: 1990 if (fromnd.ni_startdir) 1991 vrele(fromnd.ni_startdir); 1992 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 1993 return (error == -1 ? 0 : error); 1994 } 1995 1996 /* 1997 * Make a directory file. 1998 */ 1999 /* ARGSUSED */ 2000 int 2001 sys_mkdir(p, v, retval) 2002 struct proc *p; 2003 void *v; 2004 register_t *retval; 2005 { 2006 register struct sys_mkdir_args /* { 2007 syscallarg(const char *) path; 2008 syscallarg(int) mode; 2009 } */ *uap = v; 2010 register struct vnode *vp; 2011 struct vattr vattr; 2012 int error; 2013 struct nameidata nd; 2014 2015 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2016 if ((error = namei(&nd)) != 0) 2017 return (error); 2018 vp = nd.ni_vp; 2019 if (vp != NULL) { 2020 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2021 if (nd.ni_dvp == vp) 2022 vrele(nd.ni_dvp); 2023 else 2024 vput(nd.ni_dvp); 2025 vrele(vp); 2026 return (EEXIST); 2027 } 2028 VATTR_NULL(&vattr); 2029 vattr.va_type = VDIR; 2030 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 2031 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2032 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2033 if (!error) 2034 vput(nd.ni_vp); 2035 return (error); 2036 } 2037 2038 /* 2039 * Remove a directory file. 2040 */ 2041 /* ARGSUSED */ 2042 int 2043 sys_rmdir(p, v, retval) 2044 struct proc *p; 2045 void *v; 2046 register_t *retval; 2047 { 2048 struct sys_rmdir_args /* { 2049 syscallarg(const char *) path; 2050 } */ *uap = v; 2051 register struct vnode *vp; 2052 int error; 2053 struct nameidata nd; 2054 2055 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2056 SCARG(uap, path), p); 2057 if ((error = namei(&nd)) != 0) 2058 return (error); 2059 vp = nd.ni_vp; 2060 if (vp->v_type != VDIR) { 2061 error = ENOTDIR; 2062 goto out; 2063 } 2064 /* 2065 * No rmdir "." please. 2066 */ 2067 if (nd.ni_dvp == vp) { 2068 error = EINVAL; 2069 goto out; 2070 } 2071 /* 2072 * The root of a mounted filesystem cannot be deleted. 2073 */ 2074 if (vp->v_flag & VROOT) 2075 error = EBUSY; 2076 out: 2077 if (!error) { 2078 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2079 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2080 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2081 } else { 2082 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2083 if (nd.ni_dvp == vp) 2084 vrele(nd.ni_dvp); 2085 else 2086 vput(nd.ni_dvp); 2087 vput(vp); 2088 } 2089 return (error); 2090 } 2091 2092 /* 2093 * Read a block of directory entries in a file system independent format. 2094 */ 2095 int 2096 sys_getdirentries(p, v, retval) 2097 struct proc *p; 2098 void *v; 2099 register_t *retval; 2100 { 2101 register struct sys_getdirentries_args /* { 2102 syscallarg(int) fd; 2103 syscallarg(char *) buf; 2104 syscallarg(u_int) count; 2105 syscallarg(long *) basep; 2106 } */ *uap = v; 2107 register struct vnode *vp; 2108 struct file *fp; 2109 struct uio auio; 2110 struct iovec aiov; 2111 long loff; 2112 int error, eofflag; 2113 2114 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2115 return (error); 2116 if ((fp->f_flag & FREAD) == 0) 2117 return (EBADF); 2118 vp = (struct vnode *)fp->f_data; 2119 unionread: 2120 if (vp->v_type != VDIR) 2121 return (EINVAL); 2122 aiov.iov_base = SCARG(uap, buf); 2123 aiov.iov_len = SCARG(uap, count); 2124 auio.uio_iov = &aiov; 2125 auio.uio_iovcnt = 1; 2126 auio.uio_rw = UIO_READ; 2127 auio.uio_segflg = UIO_USERSPACE; 2128 auio.uio_procp = p; 2129 auio.uio_resid = SCARG(uap, count); 2130 VOP_LOCK(vp); 2131 loff = auio.uio_offset = fp->f_offset; 2132 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, (u_long *)0, 0); 2133 fp->f_offset = auio.uio_offset; 2134 VOP_UNLOCK(vp); 2135 if (error) 2136 return (error); 2137 2138 #ifdef UNION 2139 { 2140 extern int (**union_vnodeop_p) __P((void *)); 2141 extern struct vnode *union_dircache __P((struct vnode *)); 2142 2143 if ((SCARG(uap, count) == auio.uio_resid) && 2144 (vp->v_op == union_vnodeop_p)) { 2145 struct vnode *lvp; 2146 2147 lvp = union_dircache(vp); 2148 if (lvp != NULLVP) { 2149 struct vattr va; 2150 2151 /* 2152 * If the directory is opaque, 2153 * then don't show lower entries 2154 */ 2155 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 2156 if (va.va_flags & OPAQUE) { 2157 vput(lvp); 2158 lvp = NULL; 2159 } 2160 } 2161 2162 if (lvp != NULLVP) { 2163 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 2164 VOP_UNLOCK(lvp); 2165 2166 if (error) { 2167 vrele(lvp); 2168 return (error); 2169 } 2170 fp->f_data = (caddr_t) lvp; 2171 fp->f_offset = 0; 2172 error = vn_close(vp, FREAD, fp->f_cred, p); 2173 if (error) 2174 return (error); 2175 vp = lvp; 2176 goto unionread; 2177 } 2178 } 2179 } 2180 #endif /* UNION */ 2181 2182 if ((SCARG(uap, count) == auio.uio_resid) && 2183 (vp->v_flag & VROOT) && 2184 (vp->v_mount->mnt_flag & MNT_UNION)) { 2185 struct vnode *tvp = vp; 2186 vp = vp->v_mount->mnt_vnodecovered; 2187 VREF(vp); 2188 fp->f_data = (caddr_t) vp; 2189 fp->f_offset = 0; 2190 vrele(tvp); 2191 goto unionread; 2192 } 2193 error = copyout(&loff, SCARG(uap, basep), sizeof(long)); 2194 *retval = SCARG(uap, count) - auio.uio_resid; 2195 return (error); 2196 } 2197 2198 /* 2199 * Set the mode mask for creation of filesystem nodes. 2200 */ 2201 int 2202 sys_umask(p, v, retval) 2203 struct proc *p; 2204 void *v; 2205 register_t *retval; 2206 { 2207 struct sys_umask_args /* { 2208 syscallarg(int) newmask; 2209 } */ *uap = v; 2210 register struct filedesc *fdp; 2211 2212 fdp = p->p_fd; 2213 *retval = fdp->fd_cmask; 2214 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2215 return (0); 2216 } 2217 2218 /* 2219 * Void all references to file by ripping underlying filesystem 2220 * away from vnode. 2221 */ 2222 /* ARGSUSED */ 2223 int 2224 sys_revoke(p, v, retval) 2225 struct proc *p; 2226 void *v; 2227 register_t *retval; 2228 { 2229 register struct sys_revoke_args /* { 2230 syscallarg(const char *) path; 2231 } */ *uap = v; 2232 register struct vnode *vp; 2233 struct vattr vattr; 2234 int error; 2235 struct nameidata nd; 2236 2237 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2238 if ((error = namei(&nd)) != 0) 2239 return (error); 2240 vp = nd.ni_vp; 2241 if (vp->v_type != VCHR && vp->v_type != VBLK) { 2242 error = EINVAL; 2243 goto out; 2244 } 2245 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2246 goto out; 2247 if (p->p_ucred->cr_uid != vattr.va_uid && 2248 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2249 goto out; 2250 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2251 vgoneall(vp); 2252 out: 2253 vrele(vp); 2254 return (error); 2255 } 2256 2257 /* 2258 * Convert a user file descriptor to a kernel file entry. 2259 */ 2260 int 2261 getvnode(fdp, fd, fpp) 2262 struct filedesc *fdp; 2263 int fd; 2264 struct file **fpp; 2265 { 2266 struct vnode *vp; 2267 struct file *fp; 2268 2269 if ((u_int)fd >= fdp->fd_nfiles || 2270 (fp = fdp->fd_ofiles[fd]) == NULL) 2271 return (EBADF); 2272 if (fp->f_type != DTYPE_VNODE) 2273 return (EINVAL); 2274 vp = (struct vnode *)fp->f_data; 2275 if (vp->v_type == VBAD) 2276 return (EBADF); 2277 *fpp = fp; 2278 return (0); 2279 } 2280
Indexes created Wed Sep 24 15:09:51 GMT 2025