vfs_syscalls.c revision 1.63
1 /* $NetBSD: vfs_syscalls.c,v 1.63 1996/02/04 02:18:37 christos 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 #include <kern/kern_extern.h> 63 64 static int change_dir __P((struct nameidata *, struct proc *)); 65 66 void checkdirs __P((struct vnode *)); 67 int dounmount __P((struct mount *, int, struct proc *)); 68 69 /* 70 * Virtual File System System Calls 71 */ 72 73 /* 74 * Mount a file system. 75 */ 76 /* ARGSUSED */ 77 int 78 sys_mount(p, v, retval) 79 struct proc *p; 80 void *v; 81 register_t *retval; 82 { 83 register struct sys_mount_args /* { 84 syscallarg(char *) type; 85 syscallarg(char *) path; 86 syscallarg(int) flags; 87 syscallarg(caddr_t) data; 88 } */ *uap = v; 89 register struct vnode *vp; 90 register struct mount *mp; 91 int error, flag = 0; 92 u_long fsindex = 0; 93 char fstypename[MFSNAMELEN]; 94 struct vattr va; 95 struct nameidata nd; 96 97 /* 98 * Get vnode to be covered 99 */ 100 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 101 SCARG(uap, path), p); 102 if ((error = namei(&nd)) != 0) 103 return (error); 104 vp = nd.ni_vp; 105 if (SCARG(uap, flags) & MNT_UPDATE) { 106 if ((vp->v_flag & VROOT) == 0) { 107 vput(vp); 108 return (EINVAL); 109 } 110 mp = vp->v_mount; 111 flag = mp->mnt_flag; 112 /* 113 * We only allow the filesystem to be reloaded if it 114 * is currently mounted read-only. 115 */ 116 if ((SCARG(uap, flags) & MNT_RELOAD) && 117 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 118 vput(vp); 119 return (EOPNOTSUPP); /* Needs translation */ 120 } 121 mp->mnt_flag |= 122 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 123 /* 124 * Only root, or the user that did the original mount is 125 * permitted to update it. 126 */ 127 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 128 (error = suser(p->p_ucred, &p->p_acflag))) { 129 vput(vp); 130 return (error); 131 } 132 /* 133 * Do not allow NFS export by non-root users. Silently 134 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 135 */ 136 if (p->p_ucred->cr_uid != 0) { 137 if (SCARG(uap, flags) & MNT_EXPORTED) { 138 vput(vp); 139 return (EPERM); 140 } 141 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 142 } 143 VOP_UNLOCK(vp); 144 goto update; 145 } 146 /* 147 * If the user is not root, ensure that they own the directory 148 * onto which we are attempting to mount. 149 */ 150 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) || 151 (va.va_uid != p->p_ucred->cr_uid && 152 (error = suser(p->p_ucred, &p->p_acflag)))) { 153 vput(vp); 154 return (error); 155 } 156 /* 157 * Do not allow NFS export by non-root users. Silently 158 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 159 */ 160 if (p->p_ucred->cr_uid != 0) { 161 if (SCARG(uap, flags) & MNT_EXPORTED) { 162 vput(vp); 163 return (EPERM); 164 } 165 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 166 } 167 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 168 return (error); 169 if (vp->v_type != VDIR) { 170 vput(vp); 171 return (ENOTDIR); 172 } 173 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 174 if (error) { 175 #if defined(COMPAT_09) || defined(COMPAT_43) 176 /* 177 * Historically filesystem types were identified by number. 178 * If we get an integer for the filesystem type instead of a 179 * string, we check to see if it matches one of the historic 180 * filesystem types. 181 */ 182 fsindex = (u_long)SCARG(uap, type); 183 if (fsindex >= nvfssw || vfssw[fsindex] == NULL) { 184 vput(vp); 185 return (ENODEV); 186 } 187 strncpy(fstypename, vfssw[fsindex]->vfs_name, MFSNAMELEN); 188 #else 189 vput(vp); 190 return (error); 191 #endif 192 } 193 #ifdef COMPAT_10 194 /* Accept `ufs' as an alias for `ffs'. */ 195 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 196 strncpy(fstypename, "ffs", MFSNAMELEN); 197 #endif 198 for (fsindex = 0; fsindex < nvfssw; fsindex++) 199 if (vfssw[fsindex] != NULL && 200 !strncmp(vfssw[fsindex]->vfs_name, fstypename, MFSNAMELEN)) 201 break; 202 if (fsindex >= nvfssw) { 203 vput(vp); 204 return (ENODEV); 205 } 206 if (vp->v_mountedhere != NULL) { 207 vput(vp); 208 return (EBUSY); 209 } 210 211 /* 212 * Allocate and initialize the file system. 213 */ 214 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 215 M_MOUNT, M_WAITOK); 216 bzero((char *)mp, (u_long)sizeof(struct mount)); 217 mp->mnt_op = vfssw[fsindex]; 218 if ((error = vfs_lock(mp)) != 0) { 219 free((caddr_t)mp, M_MOUNT); 220 vput(vp); 221 return (error); 222 } 223 /* Do this early in case we block later. */ 224 vfssw[fsindex]->vfs_refcount++; 225 vp->v_mountedhere = mp; 226 mp->mnt_vnodecovered = vp; 227 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 228 update: 229 /* 230 * Set the mount level flags. 231 */ 232 if (SCARG(uap, flags) & MNT_RDONLY) 233 mp->mnt_flag |= MNT_RDONLY; 234 else if (mp->mnt_flag & MNT_RDONLY) 235 mp->mnt_flag |= MNT_WANTRDWR; 236 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 237 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC); 238 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 239 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC); 240 /* 241 * Mount the filesystem. 242 */ 243 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 244 if (mp->mnt_flag & MNT_UPDATE) { 245 vrele(vp); 246 if (mp->mnt_flag & MNT_WANTRDWR) 247 mp->mnt_flag &= ~MNT_RDONLY; 248 mp->mnt_flag &=~ 249 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 250 if (error) 251 mp->mnt_flag = flag; 252 return (error); 253 } 254 /* 255 * Put the new filesystem on the mount list after root. 256 */ 257 cache_purge(vp); 258 if (!error) { 259 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 260 checkdirs(vp); 261 VOP_UNLOCK(vp); 262 vfs_unlock(mp); 263 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 264 error = VFS_START(mp, 0, p); 265 } else { 266 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 267 vfssw[fsindex]->vfs_refcount--; 268 vfs_unlock(mp); 269 free((caddr_t)mp, M_MOUNT); 270 vput(vp); 271 } 272 return (error); 273 } 274 275 /* 276 * Scan all active processes to see if any of them have a current 277 * or root directory onto which the new filesystem has just been 278 * mounted. If so, replace them with the new mount point. 279 */ 280 void 281 checkdirs(olddp) 282 struct vnode *olddp; 283 { 284 struct filedesc *fdp; 285 struct vnode *newdp; 286 struct proc *p; 287 288 if (olddp->v_usecount == 1) 289 return; 290 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 291 panic("mount: lost mount"); 292 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 293 fdp = p->p_fd; 294 if (fdp->fd_cdir == olddp) { 295 vrele(fdp->fd_cdir); 296 VREF(newdp); 297 fdp->fd_cdir = newdp; 298 } 299 if (fdp->fd_rdir == olddp) { 300 vrele(fdp->fd_rdir); 301 VREF(newdp); 302 fdp->fd_rdir = newdp; 303 } 304 } 305 if (rootvnode == olddp) { 306 vrele(rootvnode); 307 VREF(newdp); 308 rootvnode = newdp; 309 } 310 vput(newdp); 311 } 312 313 /* 314 * Unmount a file system. 315 * 316 * Note: unmount takes a path to the vnode mounted on as argument, 317 * not special file (as before). 318 */ 319 /* ARGSUSED */ 320 int 321 sys_unmount(p, v, retval) 322 struct proc *p; 323 void *v; 324 register_t *retval; 325 { 326 register struct sys_unmount_args /* { 327 syscallarg(char *) path; 328 syscallarg(int) flags; 329 } */ *uap = v; 330 register struct vnode *vp; 331 struct mount *mp; 332 int error; 333 struct nameidata nd; 334 335 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 336 SCARG(uap, path), p); 337 if ((error = namei(&nd)) != 0) 338 return (error); 339 vp = nd.ni_vp; 340 mp = vp->v_mount; 341 342 /* 343 * Only root, or the user that did the original mount is 344 * permitted to unmount this filesystem. 345 */ 346 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 347 (error = suser(p->p_ucred, &p->p_acflag))) { 348 vput(vp); 349 return (error); 350 } 351 352 /* 353 * Don't allow unmounting the root file system. 354 */ 355 if (mp->mnt_flag & MNT_ROOTFS) { 356 vput(vp); 357 return (EINVAL); 358 } 359 360 /* 361 * Must be the root of the filesystem 362 */ 363 if ((vp->v_flag & VROOT) == 0) { 364 vput(vp); 365 return (EINVAL); 366 } 367 vput(vp); 368 return (dounmount(mp, SCARG(uap, flags), p)); 369 } 370 371 /* 372 * Do the actual file system unmount. 373 */ 374 int 375 dounmount(mp, flags, p) 376 register struct mount *mp; 377 int flags; 378 struct proc *p; 379 { 380 struct vnode *coveredvp; 381 int error; 382 383 coveredvp = mp->mnt_vnodecovered; 384 if (vfs_busy(mp)) 385 return (EBUSY); 386 mp->mnt_flag |= MNT_UNMOUNT; 387 if ((error = vfs_lock(mp)) != 0) 388 return (error); 389 390 mp->mnt_flag &=~ MNT_ASYNC; 391 vnode_pager_umount(mp); /* release cached vnodes */ 392 cache_purgevfs(mp); /* remove cache entries for this file sys */ 393 if ((error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0 || 394 (flags & MNT_FORCE)) 395 error = VFS_UNMOUNT(mp, flags, p); 396 mp->mnt_flag &= ~MNT_UNMOUNT; 397 vfs_unbusy(mp); 398 if (error) { 399 vfs_unlock(mp); 400 } else { 401 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 402 if (coveredvp != NULLVP) { 403 vrele(coveredvp); 404 coveredvp->v_mountedhere = (struct mount *)0; 405 } 406 mp->mnt_op->vfs_refcount--; 407 vfs_unlock(mp); 408 if (mp->mnt_vnodelist.lh_first != NULL) 409 panic("unmount: dangling vnode"); 410 free((caddr_t)mp, M_MOUNT); 411 } 412 return (error); 413 } 414 415 /* 416 * Sync each mounted filesystem. 417 */ 418 #ifdef DEBUG 419 int syncprt = 0; 420 struct ctldebug debug0 = { "syncprt", &syncprt }; 421 #endif 422 423 /* ARGSUSED */ 424 int 425 sys_sync(p, v, retval) 426 struct proc *p; 427 void *v; 428 register_t *retval; 429 { 430 register struct mount *mp, *nmp; 431 int asyncflag; 432 433 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 434 /* 435 * Get the next pointer in case we hang on vfs_busy 436 * while we are being unmounted. 437 */ 438 nmp = mp->mnt_list.cqe_next; 439 /* 440 * The lock check below is to avoid races with mount 441 * and unmount. 442 */ 443 if ((mp->mnt_flag & (MNT_MLOCK|MNT_RDONLY|MNT_MPBUSY)) == 0 && 444 !vfs_busy(mp)) { 445 asyncflag = mp->mnt_flag & MNT_ASYNC; 446 mp->mnt_flag &= ~MNT_ASYNC; 447 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 448 if (asyncflag) 449 mp->mnt_flag |= MNT_ASYNC; 450 /* 451 * Get the next pointer again, as the next filesystem 452 * might have been unmounted while we were sync'ing. 453 */ 454 nmp = mp->mnt_list.cqe_next; 455 vfs_unbusy(mp); 456 } 457 } 458 #ifdef DEBUG 459 if (syncprt) 460 vfs_bufstats(); 461 #endif /* DEBUG */ 462 return (0); 463 } 464 465 /* 466 * Change filesystem quotas. 467 */ 468 /* ARGSUSED */ 469 int 470 sys_quotactl(p, v, retval) 471 struct proc *p; 472 void *v; 473 register_t *retval; 474 { 475 register struct sys_quotactl_args /* { 476 syscallarg(char *) path; 477 syscallarg(int) cmd; 478 syscallarg(int) uid; 479 syscallarg(caddr_t) arg; 480 } */ *uap = v; 481 register struct mount *mp; 482 int error; 483 struct nameidata nd; 484 485 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 486 if ((error = namei(&nd)) != 0) 487 return (error); 488 mp = nd.ni_vp->v_mount; 489 vrele(nd.ni_vp); 490 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 491 SCARG(uap, arg), p)); 492 } 493 494 /* 495 * Get filesystem statistics. 496 */ 497 /* ARGSUSED */ 498 int 499 sys_statfs(p, v, retval) 500 struct proc *p; 501 void *v; 502 register_t *retval; 503 { 504 register struct sys_statfs_args /* { 505 syscallarg(char *) path; 506 syscallarg(struct statfs *) buf; 507 } */ *uap = v; 508 register struct mount *mp; 509 register struct statfs *sp; 510 int error; 511 struct nameidata nd; 512 513 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 514 if ((error = namei(&nd)) != 0) 515 return (error); 516 mp = nd.ni_vp->v_mount; 517 sp = &mp->mnt_stat; 518 vrele(nd.ni_vp); 519 if ((error = VFS_STATFS(mp, sp, p)) != 0) 520 return (error); 521 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 522 return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); 523 } 524 525 /* 526 * Get filesystem statistics. 527 */ 528 /* ARGSUSED */ 529 int 530 sys_fstatfs(p, v, retval) 531 struct proc *p; 532 void *v; 533 register_t *retval; 534 { 535 register struct sys_fstatfs_args /* { 536 syscallarg(int) fd; 537 syscallarg(struct statfs *) buf; 538 } */ *uap = v; 539 struct file *fp; 540 struct mount *mp; 541 register struct statfs *sp; 542 int error; 543 544 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 545 return (error); 546 mp = ((struct vnode *)fp->f_data)->v_mount; 547 sp = &mp->mnt_stat; 548 if ((error = VFS_STATFS(mp, sp, p)) != 0) 549 return (error); 550 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 551 return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); 552 } 553 554 /* 555 * Get statistics on all filesystems. 556 */ 557 int 558 sys_getfsstat(p, v, retval) 559 struct proc *p; 560 void *v; 561 register_t *retval; 562 { 563 register struct sys_getfsstat_args /* { 564 syscallarg(struct statfs *) buf; 565 syscallarg(long) bufsize; 566 syscallarg(int) flags; 567 } */ *uap = v; 568 register struct mount *mp, *nmp; 569 register struct statfs *sp; 570 caddr_t sfsp; 571 long count, maxcount, error; 572 573 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 574 sfsp = (caddr_t)SCARG(uap, buf); 575 for (count = 0, 576 mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 577 nmp = mp->mnt_list.cqe_next; 578 if (sfsp && count < maxcount && 579 ((mp->mnt_flag & MNT_MLOCK) == 0)) { 580 sp = &mp->mnt_stat; 581 /* 582 * If MNT_NOWAIT is specified, do not refresh the 583 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 584 */ 585 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 586 (SCARG(uap, flags) & MNT_WAIT)) && 587 (error = VFS_STATFS(mp, sp, p))) 588 continue; 589 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 590 error = copyout((caddr_t)sp, sfsp, sizeof(*sp)); 591 if (error) 592 return (error); 593 sfsp += sizeof(*sp); 594 } 595 count++; 596 } 597 if (sfsp && count > maxcount) 598 *retval = maxcount; 599 else 600 *retval = count; 601 return (0); 602 } 603 604 /* 605 * Change current working directory to a given file descriptor. 606 */ 607 /* ARGSUSED */ 608 int 609 sys_fchdir(p, v, retval) 610 struct proc *p; 611 void *v; 612 register_t *retval; 613 { 614 struct sys_fchdir_args /* { 615 syscallarg(int) fd; 616 } */ *uap = v; 617 register struct filedesc *fdp = p->p_fd; 618 struct vnode *vp, *tdp; 619 struct mount *mp; 620 struct file *fp; 621 int error; 622 623 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 624 return (error); 625 vp = (struct vnode *)fp->f_data; 626 VREF(vp); 627 VOP_LOCK(vp); 628 if (vp->v_type != VDIR) 629 error = ENOTDIR; 630 else 631 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 632 while (!error && (mp = vp->v_mountedhere) != NULL) { 633 if (mp->mnt_flag & MNT_MLOCK) { 634 mp->mnt_flag |= MNT_MWAIT; 635 sleep((caddr_t)mp, PVFS); 636 continue; 637 } 638 if ((error = VFS_ROOT(mp, &tdp)) != 0) 639 break; 640 vput(vp); 641 vp = tdp; 642 } 643 VOP_UNLOCK(vp); 644 if (error) { 645 vrele(vp); 646 return (error); 647 } 648 vrele(fdp->fd_cdir); 649 fdp->fd_cdir = vp; 650 return (0); 651 } 652 653 /* 654 * Change current working directory (``.''). 655 */ 656 /* ARGSUSED */ 657 int 658 sys_chdir(p, v, retval) 659 struct proc *p; 660 void *v; 661 register_t *retval; 662 { 663 struct sys_chdir_args /* { 664 syscallarg(char *) path; 665 } */ *uap = v; 666 register struct filedesc *fdp = p->p_fd; 667 int error; 668 struct nameidata nd; 669 670 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 671 SCARG(uap, path), p); 672 if ((error = change_dir(&nd, p)) != 0) 673 return (error); 674 vrele(fdp->fd_cdir); 675 fdp->fd_cdir = nd.ni_vp; 676 return (0); 677 } 678 679 /* 680 * Change notion of root (``/'') directory. 681 */ 682 /* ARGSUSED */ 683 int 684 sys_chroot(p, v, retval) 685 struct proc *p; 686 void *v; 687 register_t *retval; 688 { 689 struct sys_chroot_args /* { 690 syscallarg(char *) path; 691 } */ *uap = v; 692 register struct filedesc *fdp = p->p_fd; 693 int error; 694 struct nameidata nd; 695 696 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 697 return (error); 698 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 699 SCARG(uap, path), p); 700 if ((error = change_dir(&nd, p)) != 0) 701 return (error); 702 if (fdp->fd_rdir != NULL) 703 vrele(fdp->fd_rdir); 704 fdp->fd_rdir = nd.ni_vp; 705 return (0); 706 } 707 708 /* 709 * Common routine for chroot and chdir. 710 */ 711 static int 712 change_dir(ndp, p) 713 register struct nameidata *ndp; 714 struct proc *p; 715 { 716 struct vnode *vp; 717 int error; 718 719 if ((error = namei(ndp)) != 0) 720 return (error); 721 vp = ndp->ni_vp; 722 if (vp->v_type != VDIR) 723 error = ENOTDIR; 724 else 725 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 726 VOP_UNLOCK(vp); 727 if (error) 728 vrele(vp); 729 return (error); 730 } 731 732 /* 733 * Check permissions, allocate an open file structure, 734 * and call the device open routine if any. 735 */ 736 int 737 sys_open(p, v, retval) 738 struct proc *p; 739 void *v; 740 register_t *retval; 741 { 742 register struct sys_open_args /* { 743 syscallarg(char *) path; 744 syscallarg(int) flags; 745 syscallarg(int) mode; 746 } */ *uap = v; 747 register struct filedesc *fdp = p->p_fd; 748 register struct file *fp; 749 register struct vnode *vp; 750 int flags, cmode; 751 struct file *nfp; 752 int type, indx, error; 753 struct flock lf; 754 struct nameidata nd; 755 extern struct fileops vnops; 756 757 if ((error = falloc(p, &nfp, &indx)) != 0) 758 return (error); 759 fp = nfp; 760 flags = FFLAGS(SCARG(uap, flags)); 761 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 762 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 763 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 764 if ((error = vn_open(&nd, flags, cmode)) != 0) { 765 ffree(fp); 766 if ((error == ENODEV || error == ENXIO) && 767 p->p_dupfd >= 0 && /* XXX from fdopen */ 768 (error = 769 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 770 *retval = indx; 771 return (0); 772 } 773 if (error == ERESTART) 774 error = EINTR; 775 fdp->fd_ofiles[indx] = NULL; 776 return (error); 777 } 778 p->p_dupfd = 0; 779 vp = nd.ni_vp; 780 fp->f_flag = flags & FMASK; 781 fp->f_type = DTYPE_VNODE; 782 fp->f_ops = &vnops; 783 fp->f_data = (caddr_t)vp; 784 if (flags & (O_EXLOCK | O_SHLOCK)) { 785 lf.l_whence = SEEK_SET; 786 lf.l_start = 0; 787 lf.l_len = 0; 788 if (flags & O_EXLOCK) 789 lf.l_type = F_WRLCK; 790 else 791 lf.l_type = F_RDLCK; 792 type = F_FLOCK; 793 if ((flags & FNONBLOCK) == 0) 794 type |= F_WAIT; 795 VOP_UNLOCK(vp); 796 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 797 if (error) { 798 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 799 ffree(fp); 800 fdp->fd_ofiles[indx] = NULL; 801 return (error); 802 } 803 VOP_LOCK(vp); 804 fp->f_flag |= FHASLOCK; 805 } 806 VOP_UNLOCK(vp); 807 *retval = indx; 808 return (0); 809 } 810 811 /* 812 * Create a special file. 813 */ 814 /* ARGSUSED */ 815 int 816 sys_mknod(p, v, retval) 817 struct proc *p; 818 void *v; 819 register_t *retval; 820 { 821 register struct sys_mknod_args /* { 822 syscallarg(char *) path; 823 syscallarg(int) mode; 824 syscallarg(int) dev; 825 } */ *uap = v; 826 register struct vnode *vp; 827 struct vattr vattr; 828 int error; 829 int whiteout = 0; 830 struct nameidata nd; 831 832 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 833 return (error); 834 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 835 if ((error = namei(&nd)) != 0) 836 return (error); 837 vp = nd.ni_vp; 838 if (vp != NULL) 839 error = EEXIST; 840 else { 841 VATTR_NULL(&vattr); 842 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 843 vattr.va_rdev = SCARG(uap, dev); 844 whiteout = 0; 845 846 switch (SCARG(uap, mode) & S_IFMT) { 847 case S_IFMT: /* used by badsect to flag bad sectors */ 848 vattr.va_type = VBAD; 849 break; 850 case S_IFCHR: 851 vattr.va_type = VCHR; 852 break; 853 case S_IFBLK: 854 vattr.va_type = VBLK; 855 break; 856 case S_IFWHT: 857 whiteout = 1; 858 break; 859 default: 860 error = EINVAL; 861 break; 862 } 863 } 864 if (!error) { 865 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 866 if (whiteout) { 867 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 868 if (error) 869 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 870 vput(nd.ni_dvp); 871 } else { 872 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 873 &nd.ni_cnd, &vattr); 874 } 875 } else { 876 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 877 if (nd.ni_dvp == vp) 878 vrele(nd.ni_dvp); 879 else 880 vput(nd.ni_dvp); 881 if (vp) 882 vrele(vp); 883 } 884 return (error); 885 } 886 887 /* 888 * Create a named pipe. 889 */ 890 /* ARGSUSED */ 891 int 892 sys_mkfifo(p, v, retval) 893 struct proc *p; 894 void *v; 895 register_t *retval; 896 { 897 register struct sys_mkfifo_args /* { 898 syscallarg(char *) path; 899 syscallarg(int) mode; 900 } */ *uap = v; 901 struct vattr vattr; 902 int error; 903 struct nameidata nd; 904 905 #ifndef FIFO 906 return (EOPNOTSUPP); 907 #else 908 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 909 if ((error = namei(&nd)) != 0) 910 return (error); 911 if (nd.ni_vp != NULL) { 912 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 913 if (nd.ni_dvp == nd.ni_vp) 914 vrele(nd.ni_dvp); 915 else 916 vput(nd.ni_dvp); 917 vrele(nd.ni_vp); 918 return (EEXIST); 919 } 920 VATTR_NULL(&vattr); 921 vattr.va_type = VFIFO; 922 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 923 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 924 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 925 #endif /* FIFO */ 926 } 927 928 /* 929 * Make a hard file link. 930 */ 931 /* ARGSUSED */ 932 int 933 sys_link(p, v, retval) 934 struct proc *p; 935 void *v; 936 register_t *retval; 937 { 938 register struct sys_link_args /* { 939 syscallarg(char *) path; 940 syscallarg(char *) link; 941 } */ *uap = v; 942 register struct vnode *vp; 943 struct nameidata nd; 944 int error; 945 946 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 947 if ((error = namei(&nd)) != 0) 948 return (error); 949 vp = nd.ni_vp; 950 if (vp->v_type != VDIR || 951 (error = suser(p->p_ucred, &p->p_acflag)) == 0) { 952 nd.ni_cnd.cn_nameiop = CREATE; 953 nd.ni_cnd.cn_flags = LOCKPARENT; 954 nd.ni_dirp = SCARG(uap, link); 955 if ((error = namei(&nd)) == 0) { 956 if (nd.ni_vp != NULL) 957 error = EEXIST; 958 if (!error) { 959 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, 960 LEASE_WRITE); 961 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 962 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 963 } else { 964 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 965 if (nd.ni_dvp == nd.ni_vp) 966 vrele(nd.ni_dvp); 967 else 968 vput(nd.ni_dvp); 969 if (nd.ni_vp) 970 vrele(nd.ni_vp); 971 } 972 } 973 } 974 vrele(vp); 975 return (error); 976 } 977 978 /* 979 * Make a symbolic link. 980 */ 981 /* ARGSUSED */ 982 int 983 sys_symlink(p, v, retval) 984 struct proc *p; 985 void *v; 986 register_t *retval; 987 { 988 register struct sys_symlink_args /* { 989 syscallarg(char *) path; 990 syscallarg(char *) link; 991 } */ *uap = v; 992 struct vattr vattr; 993 char *path; 994 int error; 995 struct nameidata nd; 996 997 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 998 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 999 if (error) 1000 goto out; 1001 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1002 if ((error = namei(&nd)) != 0) 1003 goto out; 1004 if (nd.ni_vp) { 1005 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1006 if (nd.ni_dvp == nd.ni_vp) 1007 vrele(nd.ni_dvp); 1008 else 1009 vput(nd.ni_dvp); 1010 vrele(nd.ni_vp); 1011 error = EEXIST; 1012 goto out; 1013 } 1014 VATTR_NULL(&vattr); 1015 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1016 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1017 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1018 out: 1019 FREE(path, M_NAMEI); 1020 return (error); 1021 } 1022 1023 /* 1024 * Delete a whiteout from the filesystem. 1025 */ 1026 /* ARGSUSED */ 1027 int 1028 sys_undelete(p, v, retval) 1029 struct proc *p; 1030 void *v; 1031 register_t *retval; 1032 { 1033 register struct sys_undelete_args /* { 1034 syscallarg(char *) path; 1035 } */ *uap = v; 1036 int error; 1037 struct nameidata nd; 1038 1039 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1040 SCARG(uap, path), p); 1041 error = namei(&nd); 1042 if (error) 1043 return (error); 1044 1045 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1046 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1047 if (nd.ni_dvp == nd.ni_vp) 1048 vrele(nd.ni_dvp); 1049 else 1050 vput(nd.ni_dvp); 1051 if (nd.ni_vp) 1052 vrele(nd.ni_vp); 1053 return (EEXIST); 1054 } 1055 1056 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1057 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1058 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1059 vput(nd.ni_dvp); 1060 return (error); 1061 } 1062 1063 /* 1064 * Delete a name from the filesystem. 1065 */ 1066 /* ARGSUSED */ 1067 int 1068 sys_unlink(p, v, retval) 1069 struct proc *p; 1070 void *v; 1071 register_t *retval; 1072 { 1073 struct sys_unlink_args /* { 1074 syscallarg(char *) path; 1075 } */ *uap = v; 1076 register struct vnode *vp; 1077 int error; 1078 struct nameidata nd; 1079 1080 NDINIT(&nd, DELETE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1081 if ((error = namei(&nd)) != 0) 1082 return (error); 1083 vp = nd.ni_vp; 1084 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1085 VOP_LOCK(vp); 1086 1087 if (vp->v_type != VDIR || 1088 (error = suser(p->p_ucred, &p->p_acflag)) == 0) { 1089 /* 1090 * The root of a mounted filesystem cannot be deleted. 1091 */ 1092 if (vp->v_flag & VROOT) 1093 error = EBUSY; 1094 else 1095 (void)vnode_pager_uncache(vp); 1096 } 1097 1098 if (!error) { 1099 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1100 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1101 } else { 1102 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1103 if (nd.ni_dvp == vp) 1104 vrele(nd.ni_dvp); 1105 else 1106 vput(nd.ni_dvp); 1107 if (vp != NULLVP) 1108 vput(vp); 1109 } 1110 return (error); 1111 } 1112 1113 /* 1114 * Reposition read/write file offset. 1115 */ 1116 int 1117 sys_lseek(p, v, retval) 1118 struct proc *p; 1119 void *v; 1120 register_t *retval; 1121 { 1122 register struct sys_lseek_args /* { 1123 syscallarg(int) fd; 1124 syscallarg(int) pad; 1125 syscallarg(off_t) offset; 1126 syscallarg(int) whence; 1127 } */ *uap = v; 1128 struct ucred *cred = p->p_ucred; 1129 register struct filedesc *fdp = p->p_fd; 1130 register struct file *fp; 1131 struct vattr vattr; 1132 int error; 1133 1134 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1135 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1136 return (EBADF); 1137 if (fp->f_type != DTYPE_VNODE) 1138 return (ESPIPE); 1139 switch (SCARG(uap, whence)) { 1140 case L_INCR: 1141 fp->f_offset += SCARG(uap, offset); 1142 break; 1143 case L_XTND: 1144 error = VOP_GETATTR((struct vnode *)fp->f_data, &vattr, 1145 cred, p); 1146 if (error) 1147 return (error); 1148 fp->f_offset = SCARG(uap, offset) + vattr.va_size; 1149 break; 1150 case L_SET: 1151 fp->f_offset = SCARG(uap, offset); 1152 break; 1153 default: 1154 return (EINVAL); 1155 } 1156 *(off_t *)retval = fp->f_offset; 1157 return (0); 1158 } 1159 1160 /* 1161 * Check access permissions. 1162 */ 1163 int 1164 sys_access(p, v, retval) 1165 struct proc *p; 1166 void *v; 1167 register_t *retval; 1168 { 1169 register struct sys_access_args /* { 1170 syscallarg(char *) path; 1171 syscallarg(int) flags; 1172 } */ *uap = v; 1173 register struct ucred *cred = p->p_ucred; 1174 register struct vnode *vp; 1175 int error, flags, t_gid, t_uid; 1176 struct nameidata nd; 1177 1178 t_uid = cred->cr_uid; 1179 t_gid = cred->cr_gid; 1180 cred->cr_uid = p->p_cred->p_ruid; 1181 cred->cr_gid = p->p_cred->p_rgid; 1182 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1183 SCARG(uap, path), p); 1184 if ((error = namei(&nd)) != 0) 1185 goto out1; 1186 vp = nd.ni_vp; 1187 1188 /* Flags == 0 means only check for existence. */ 1189 if (SCARG(uap, flags)) { 1190 flags = 0; 1191 if (SCARG(uap, flags) & R_OK) 1192 flags |= VREAD; 1193 if (SCARG(uap, flags) & W_OK) 1194 flags |= VWRITE; 1195 if (SCARG(uap, flags) & X_OK) 1196 flags |= VEXEC; 1197 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1198 error = VOP_ACCESS(vp, flags, cred, p); 1199 } 1200 vput(vp); 1201 out1: 1202 cred->cr_uid = t_uid; 1203 cred->cr_gid = t_gid; 1204 return (error); 1205 } 1206 1207 /* 1208 * Get file status; this version follows links. 1209 */ 1210 /* ARGSUSED */ 1211 int 1212 sys_stat(p, v, retval) 1213 struct proc *p; 1214 void *v; 1215 register_t *retval; 1216 { 1217 register struct sys_stat_args /* { 1218 syscallarg(char *) path; 1219 syscallarg(struct stat *) ub; 1220 } */ *uap = v; 1221 struct stat sb; 1222 int error; 1223 struct nameidata nd; 1224 1225 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1226 SCARG(uap, path), p); 1227 if ((error = namei(&nd)) != 0) 1228 return (error); 1229 error = vn_stat(nd.ni_vp, &sb, p); 1230 vput(nd.ni_vp); 1231 if (error) 1232 return (error); 1233 error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); 1234 return (error); 1235 } 1236 1237 /* 1238 * Get file status; this version does not follow links. 1239 */ 1240 /* ARGSUSED */ 1241 int 1242 sys_lstat(p, v, retval) 1243 struct proc *p; 1244 void *v; 1245 register_t *retval; 1246 { 1247 register struct sys_lstat_args /* { 1248 syscallarg(char *) path; 1249 syscallarg(struct stat *) ub; 1250 } */ *uap = v; 1251 int error; 1252 struct vnode *vp, *dvp; 1253 struct stat sb, sb1; 1254 struct nameidata nd; 1255 1256 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | LOCKPARENT, UIO_USERSPACE, 1257 SCARG(uap, path), p); 1258 if ((error = namei(&nd)) != 0) 1259 return (error); 1260 /* 1261 * For symbolic links, always return the attributes of its 1262 * containing directory, except for mode, size, and links. 1263 */ 1264 vp = nd.ni_vp; 1265 dvp = nd.ni_dvp; 1266 if (vp->v_type != VLNK) { 1267 if (dvp == vp) 1268 vrele(dvp); 1269 else 1270 vput(dvp); 1271 error = vn_stat(vp, &sb, p); 1272 vput(vp); 1273 if (error) 1274 return (error); 1275 } else { 1276 error = vn_stat(dvp, &sb, p); 1277 vput(dvp); 1278 if (error) { 1279 vput(vp); 1280 return (error); 1281 } 1282 error = vn_stat(vp, &sb1, p); 1283 vput(vp); 1284 if (error) 1285 return (error); 1286 sb.st_mode &= ~S_IFDIR; 1287 sb.st_mode |= S_IFLNK; 1288 sb.st_nlink = sb1.st_nlink; 1289 sb.st_size = sb1.st_size; 1290 sb.st_blocks = sb1.st_blocks; 1291 } 1292 error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); 1293 return (error); 1294 } 1295 1296 /* 1297 * Get configurable pathname variables. 1298 */ 1299 /* ARGSUSED */ 1300 int 1301 sys_pathconf(p, v, retval) 1302 struct proc *p; 1303 void *v; 1304 register_t *retval; 1305 { 1306 register struct sys_pathconf_args /* { 1307 syscallarg(char *) path; 1308 syscallarg(int) name; 1309 } */ *uap = v; 1310 int error; 1311 struct nameidata nd; 1312 1313 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1314 SCARG(uap, path), p); 1315 if ((error = namei(&nd)) != 0) 1316 return (error); 1317 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1318 vput(nd.ni_vp); 1319 return (error); 1320 } 1321 1322 /* 1323 * Return target name of a symbolic link. 1324 */ 1325 /* ARGSUSED */ 1326 int 1327 sys_readlink(p, v, retval) 1328 struct proc *p; 1329 void *v; 1330 register_t *retval; 1331 { 1332 register struct sys_readlink_args /* { 1333 syscallarg(char *) path; 1334 syscallarg(char *) buf; 1335 syscallarg(int) count; 1336 } */ *uap = v; 1337 register struct vnode *vp; 1338 struct iovec aiov; 1339 struct uio auio; 1340 int error; 1341 struct nameidata nd; 1342 1343 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1344 SCARG(uap, path), p); 1345 if ((error = namei(&nd)) != 0) 1346 return (error); 1347 vp = nd.ni_vp; 1348 if (vp->v_type != VLNK) 1349 error = EINVAL; 1350 else { 1351 aiov.iov_base = SCARG(uap, buf); 1352 aiov.iov_len = SCARG(uap, count); 1353 auio.uio_iov = &aiov; 1354 auio.uio_iovcnt = 1; 1355 auio.uio_offset = 0; 1356 auio.uio_rw = UIO_READ; 1357 auio.uio_segflg = UIO_USERSPACE; 1358 auio.uio_procp = p; 1359 auio.uio_resid = SCARG(uap, count); 1360 error = VOP_READLINK(vp, &auio, p->p_ucred); 1361 } 1362 vput(vp); 1363 *retval = SCARG(uap, count) - auio.uio_resid; 1364 return (error); 1365 } 1366 1367 /* 1368 * Change flags of a file given a path name. 1369 */ 1370 /* ARGSUSED */ 1371 int 1372 sys_chflags(p, v, retval) 1373 struct proc *p; 1374 void *v; 1375 register_t *retval; 1376 { 1377 register struct sys_chflags_args /* { 1378 syscallarg(char *) path; 1379 syscallarg(int) flags; 1380 } */ *uap = v; 1381 register struct vnode *vp; 1382 struct vattr vattr; 1383 int error; 1384 struct nameidata nd; 1385 1386 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1387 if ((error = namei(&nd)) != 0) 1388 return (error); 1389 vp = nd.ni_vp; 1390 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1391 VOP_LOCK(vp); 1392 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1393 error = EROFS; 1394 else { 1395 VATTR_NULL(&vattr); 1396 vattr.va_flags = SCARG(uap, flags); 1397 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1398 } 1399 vput(vp); 1400 return (error); 1401 } 1402 1403 /* 1404 * Change flags of a file given a file descriptor. 1405 */ 1406 /* ARGSUSED */ 1407 int 1408 sys_fchflags(p, v, retval) 1409 struct proc *p; 1410 void *v; 1411 register_t *retval; 1412 { 1413 register struct sys_fchflags_args /* { 1414 syscallarg(int) fd; 1415 syscallarg(int) flags; 1416 } */ *uap = v; 1417 struct vattr vattr; 1418 struct vnode *vp; 1419 struct file *fp; 1420 int error; 1421 1422 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1423 return (error); 1424 vp = (struct vnode *)fp->f_data; 1425 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1426 VOP_LOCK(vp); 1427 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1428 error = EROFS; 1429 else { 1430 VATTR_NULL(&vattr); 1431 vattr.va_flags = SCARG(uap, flags); 1432 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1433 } 1434 VOP_UNLOCK(vp); 1435 return (error); 1436 } 1437 1438 /* 1439 * Change mode of a file given path name. 1440 */ 1441 /* ARGSUSED */ 1442 int 1443 sys_chmod(p, v, retval) 1444 struct proc *p; 1445 void *v; 1446 register_t *retval; 1447 { 1448 register struct sys_chmod_args /* { 1449 syscallarg(char *) path; 1450 syscallarg(int) mode; 1451 } */ *uap = v; 1452 register struct vnode *vp; 1453 struct vattr vattr; 1454 int error; 1455 struct nameidata nd; 1456 1457 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1458 if ((error = namei(&nd)) != 0) 1459 return (error); 1460 vp = nd.ni_vp; 1461 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1462 VOP_LOCK(vp); 1463 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1464 error = EROFS; 1465 else { 1466 VATTR_NULL(&vattr); 1467 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1468 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1469 } 1470 vput(vp); 1471 return (error); 1472 } 1473 1474 /* 1475 * Change mode of a file given a file descriptor. 1476 */ 1477 /* ARGSUSED */ 1478 int 1479 sys_fchmod(p, v, retval) 1480 struct proc *p; 1481 void *v; 1482 register_t *retval; 1483 { 1484 register struct sys_fchmod_args /* { 1485 syscallarg(int) fd; 1486 syscallarg(int) mode; 1487 } */ *uap = v; 1488 struct vattr vattr; 1489 struct vnode *vp; 1490 struct file *fp; 1491 int error; 1492 1493 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1494 return (error); 1495 vp = (struct vnode *)fp->f_data; 1496 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1497 VOP_LOCK(vp); 1498 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1499 error = EROFS; 1500 else { 1501 VATTR_NULL(&vattr); 1502 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1503 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1504 } 1505 VOP_UNLOCK(vp); 1506 return (error); 1507 } 1508 1509 /* 1510 * Set ownership given a path name. 1511 */ 1512 /* ARGSUSED */ 1513 int 1514 sys_chown(p, v, retval) 1515 struct proc *p; 1516 void *v; 1517 register_t *retval; 1518 { 1519 register struct sys_chown_args /* { 1520 syscallarg(char *) path; 1521 syscallarg(int) uid; 1522 syscallarg(int) gid; 1523 } */ *uap = v; 1524 register struct vnode *vp; 1525 struct vattr vattr; 1526 int error; 1527 struct nameidata nd; 1528 1529 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1530 if ((error = namei(&nd)) != 0) 1531 return (error); 1532 vp = nd.ni_vp; 1533 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1534 VOP_LOCK(vp); 1535 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1536 error = EROFS; 1537 else { 1538 VATTR_NULL(&vattr); 1539 vattr.va_uid = SCARG(uap, uid); 1540 vattr.va_gid = SCARG(uap, gid); 1541 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1542 } 1543 vput(vp); 1544 return (error); 1545 } 1546 1547 /* 1548 * Set ownership given a file descriptor. 1549 */ 1550 /* ARGSUSED */ 1551 int 1552 sys_fchown(p, v, retval) 1553 struct proc *p; 1554 void *v; 1555 register_t *retval; 1556 { 1557 register struct sys_fchown_args /* { 1558 syscallarg(int) fd; 1559 syscallarg(int) uid; 1560 syscallarg(int) gid; 1561 } */ *uap = v; 1562 struct vattr vattr; 1563 struct vnode *vp; 1564 struct file *fp; 1565 int error; 1566 1567 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1568 return (error); 1569 vp = (struct vnode *)fp->f_data; 1570 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1571 VOP_LOCK(vp); 1572 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1573 error = EROFS; 1574 else { 1575 VATTR_NULL(&vattr); 1576 vattr.va_uid = SCARG(uap, uid); 1577 vattr.va_gid = SCARG(uap, gid); 1578 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1579 } 1580 VOP_UNLOCK(vp); 1581 return (error); 1582 } 1583 1584 /* 1585 * Set the access and modification times of a file. 1586 */ 1587 /* ARGSUSED */ 1588 int 1589 sys_utimes(p, v, retval) 1590 struct proc *p; 1591 void *v; 1592 register_t *retval; 1593 { 1594 register struct sys_utimes_args /* { 1595 syscallarg(char *) path; 1596 syscallarg(struct timeval *) tptr; 1597 } */ *uap = v; 1598 register struct vnode *vp; 1599 struct timeval tv[2]; 1600 struct vattr vattr; 1601 int error; 1602 struct nameidata nd; 1603 1604 VATTR_NULL(&vattr); 1605 if (SCARG(uap, tptr) == NULL) { 1606 microtime(&tv[0]); 1607 tv[1] = tv[0]; 1608 vattr.va_vaflags |= VA_UTIMES_NULL; 1609 } 1610 else { 1611 error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv, 1612 sizeof (tv)); 1613 if (error) 1614 return (error); 1615 } 1616 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1617 if ((error = namei(&nd)) != 0) 1618 return (error); 1619 vp = nd.ni_vp; 1620 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1621 VOP_LOCK(vp); 1622 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1623 error = EROFS; 1624 else { 1625 vattr.va_atime.tv_sec = tv[0].tv_sec; 1626 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1627 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1628 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1629 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1630 } 1631 vput(vp); 1632 return (error); 1633 } 1634 1635 /* 1636 * Truncate a file given its path name. 1637 */ 1638 /* ARGSUSED */ 1639 int 1640 sys_truncate(p, v, retval) 1641 struct proc *p; 1642 void *v; 1643 register_t *retval; 1644 { 1645 register struct sys_truncate_args /* { 1646 syscallarg(char *) path; 1647 syscallarg(int) pad; 1648 syscallarg(off_t) length; 1649 } */ *uap = v; 1650 register struct vnode *vp; 1651 struct vattr vattr; 1652 int error; 1653 struct nameidata nd; 1654 1655 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1656 if ((error = namei(&nd)) != 0) 1657 return (error); 1658 vp = nd.ni_vp; 1659 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1660 VOP_LOCK(vp); 1661 if (vp->v_type == VDIR) 1662 error = EISDIR; 1663 else if ((error = vn_writechk(vp)) == 0 && 1664 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1665 VATTR_NULL(&vattr); 1666 vattr.va_size = SCARG(uap, length); 1667 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1668 } 1669 vput(vp); 1670 return (error); 1671 } 1672 1673 /* 1674 * Truncate a file given a file descriptor. 1675 */ 1676 /* ARGSUSED */ 1677 int 1678 sys_ftruncate(p, v, retval) 1679 struct proc *p; 1680 void *v; 1681 register_t *retval; 1682 { 1683 register struct sys_ftruncate_args /* { 1684 syscallarg(int) fd; 1685 syscallarg(int) pad; 1686 syscallarg(off_t) length; 1687 } */ *uap = v; 1688 struct vattr vattr; 1689 struct vnode *vp; 1690 struct file *fp; 1691 int error; 1692 1693 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1694 return (error); 1695 if ((fp->f_flag & FWRITE) == 0) 1696 return (EINVAL); 1697 vp = (struct vnode *)fp->f_data; 1698 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1699 VOP_LOCK(vp); 1700 if (vp->v_type == VDIR) 1701 error = EISDIR; 1702 else if ((error = vn_writechk(vp)) == 0) { 1703 VATTR_NULL(&vattr); 1704 vattr.va_size = SCARG(uap, length); 1705 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1706 } 1707 VOP_UNLOCK(vp); 1708 return (error); 1709 } 1710 1711 /* 1712 * Sync an open file. 1713 */ 1714 /* ARGSUSED */ 1715 int 1716 sys_fsync(p, v, retval) 1717 struct proc *p; 1718 void *v; 1719 register_t *retval; 1720 { 1721 struct sys_fsync_args /* { 1722 syscallarg(int) fd; 1723 } */ *uap = v; 1724 register struct vnode *vp; 1725 struct file *fp; 1726 int error; 1727 1728 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1729 return (error); 1730 vp = (struct vnode *)fp->f_data; 1731 VOP_LOCK(vp); 1732 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p); 1733 VOP_UNLOCK(vp); 1734 return (error); 1735 } 1736 1737 /* 1738 * Rename files. Source and destination must either both be directories, 1739 * or both not be directories. If target is a directory, it must be empty. 1740 */ 1741 /* ARGSUSED */ 1742 int 1743 sys_rename(p, v, retval) 1744 struct proc *p; 1745 void *v; 1746 register_t *retval; 1747 { 1748 register struct sys_rename_args /* { 1749 syscallarg(char *) from; 1750 syscallarg(char *) to; 1751 } */ *uap = v; 1752 register struct vnode *tvp, *fvp, *tdvp; 1753 struct nameidata fromnd, tond; 1754 int error; 1755 1756 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 1757 SCARG(uap, from), p); 1758 if ((error = namei(&fromnd)) != 0) 1759 return (error); 1760 fvp = fromnd.ni_vp; 1761 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 1762 UIO_USERSPACE, SCARG(uap, to), p); 1763 if ((error = namei(&tond)) != 0) { 1764 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1765 vrele(fromnd.ni_dvp); 1766 vrele(fvp); 1767 goto out1; 1768 } 1769 tdvp = tond.ni_dvp; 1770 tvp = tond.ni_vp; 1771 if (tvp != NULL) { 1772 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 1773 error = ENOTDIR; 1774 goto out; 1775 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 1776 error = EISDIR; 1777 goto out; 1778 } 1779 } 1780 if (fvp == tdvp) 1781 error = EINVAL; 1782 /* 1783 * If source is the same as the destination (that is the 1784 * same inode number with the same name in the same directory), 1785 * then there is nothing to do. 1786 */ 1787 if (fvp == tvp && fromnd.ni_dvp == tdvp && 1788 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 1789 !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, 1790 fromnd.ni_cnd.cn_namelen)) 1791 error = -1; 1792 out: 1793 if (!error) { 1794 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 1795 if (fromnd.ni_dvp != tdvp) 1796 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1797 if (tvp) 1798 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 1799 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 1800 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 1801 } else { 1802 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 1803 if (tdvp == tvp) 1804 vrele(tdvp); 1805 else 1806 vput(tdvp); 1807 if (tvp) 1808 vput(tvp); 1809 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1810 vrele(fromnd.ni_dvp); 1811 vrele(fvp); 1812 } 1813 vrele(tond.ni_startdir); 1814 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 1815 out1: 1816 if (fromnd.ni_startdir) 1817 vrele(fromnd.ni_startdir); 1818 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 1819 if (error == -1) 1820 return (0); 1821 return (error); 1822 } 1823 1824 /* 1825 * Make a directory file. 1826 */ 1827 /* ARGSUSED */ 1828 int 1829 sys_mkdir(p, v, retval) 1830 struct proc *p; 1831 void *v; 1832 register_t *retval; 1833 { 1834 register struct sys_mkdir_args /* { 1835 syscallarg(char *) path; 1836 syscallarg(int) mode; 1837 } */ *uap = v; 1838 register struct vnode *vp; 1839 struct vattr vattr; 1840 int error; 1841 struct nameidata nd; 1842 1843 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1844 if ((error = namei(&nd)) != 0) 1845 return (error); 1846 vp = nd.ni_vp; 1847 if (vp != NULL) { 1848 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1849 if (nd.ni_dvp == vp) 1850 vrele(nd.ni_dvp); 1851 else 1852 vput(nd.ni_dvp); 1853 vrele(vp); 1854 return (EEXIST); 1855 } 1856 VATTR_NULL(&vattr); 1857 vattr.va_type = VDIR; 1858 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 1859 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1860 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1861 if (!error) 1862 vput(nd.ni_vp); 1863 return (error); 1864 } 1865 1866 /* 1867 * Remove a directory file. 1868 */ 1869 /* ARGSUSED */ 1870 int 1871 sys_rmdir(p, v, retval) 1872 struct proc *p; 1873 void *v; 1874 register_t *retval; 1875 { 1876 struct sys_rmdir_args /* { 1877 syscallarg(char *) path; 1878 } */ *uap = v; 1879 register struct vnode *vp; 1880 int error; 1881 struct nameidata nd; 1882 1883 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1884 SCARG(uap, path), p); 1885 if ((error = namei(&nd)) != 0) 1886 return (error); 1887 vp = nd.ni_vp; 1888 if (vp->v_type != VDIR) { 1889 error = ENOTDIR; 1890 goto out; 1891 } 1892 /* 1893 * No rmdir "." please. 1894 */ 1895 if (nd.ni_dvp == vp) { 1896 error = EINVAL; 1897 goto out; 1898 } 1899 /* 1900 * The root of a mounted filesystem cannot be deleted. 1901 */ 1902 if (vp->v_flag & VROOT) 1903 error = EBUSY; 1904 out: 1905 if (!error) { 1906 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1907 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1908 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1909 } else { 1910 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1911 if (nd.ni_dvp == vp) 1912 vrele(nd.ni_dvp); 1913 else 1914 vput(nd.ni_dvp); 1915 vput(vp); 1916 } 1917 return (error); 1918 } 1919 1920 /* 1921 * Read a block of directory entries in a file system independent format. 1922 */ 1923 int 1924 sys_getdirentries(p, v, retval) 1925 struct proc *p; 1926 void *v; 1927 register_t *retval; 1928 { 1929 register struct sys_getdirentries_args /* { 1930 syscallarg(int) fd; 1931 syscallarg(char *) buf; 1932 syscallarg(u_int) count; 1933 syscallarg(long *) basep; 1934 } */ *uap = v; 1935 register struct vnode *vp; 1936 struct file *fp; 1937 struct uio auio; 1938 struct iovec aiov; 1939 long loff; 1940 int error, eofflag; 1941 1942 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1943 return (error); 1944 if ((fp->f_flag & FREAD) == 0) 1945 return (EBADF); 1946 vp = (struct vnode *)fp->f_data; 1947 unionread: 1948 if (vp->v_type != VDIR) 1949 return (EINVAL); 1950 aiov.iov_base = SCARG(uap, buf); 1951 aiov.iov_len = SCARG(uap, count); 1952 auio.uio_iov = &aiov; 1953 auio.uio_iovcnt = 1; 1954 auio.uio_rw = UIO_READ; 1955 auio.uio_segflg = UIO_USERSPACE; 1956 auio.uio_procp = p; 1957 auio.uio_resid = SCARG(uap, count); 1958 VOP_LOCK(vp); 1959 loff = auio.uio_offset = fp->f_offset; 1960 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, (u_long *)0, 0); 1961 fp->f_offset = auio.uio_offset; 1962 VOP_UNLOCK(vp); 1963 if (error) 1964 return (error); 1965 1966 #ifdef UNION 1967 { 1968 extern int (**union_vnodeop_p) __P((void *)); 1969 extern struct vnode *union_dircache __P((struct vnode *)); 1970 1971 if ((SCARG(uap, count) == auio.uio_resid) && 1972 (vp->v_op == union_vnodeop_p)) { 1973 struct vnode *lvp; 1974 1975 lvp = union_dircache(vp); 1976 if (lvp != NULLVP) { 1977 struct vattr va; 1978 1979 /* 1980 * If the directory is opaque, 1981 * then don't show lower entries 1982 */ 1983 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 1984 if (va.va_flags & OPAQUE) { 1985 vput(lvp); 1986 lvp = NULL; 1987 } 1988 } 1989 1990 if (lvp != NULLVP) { 1991 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 1992 VOP_UNLOCK(lvp); 1993 1994 if (error) { 1995 vrele(lvp); 1996 return (error); 1997 } 1998 fp->f_data = (caddr_t) lvp; 1999 fp->f_offset = 0; 2000 error = vn_close(vp, FREAD, fp->f_cred, p); 2001 if (error) 2002 return (error); 2003 vp = lvp; 2004 goto unionread; 2005 } 2006 } 2007 } 2008 #endif /* UNION */ 2009 2010 if ((SCARG(uap, count) == auio.uio_resid) && 2011 (vp->v_flag & VROOT) && 2012 (vp->v_mount->mnt_flag & MNT_UNION)) { 2013 struct vnode *tvp = vp; 2014 vp = vp->v_mount->mnt_vnodecovered; 2015 VREF(vp); 2016 fp->f_data = (caddr_t) vp; 2017 fp->f_offset = 0; 2018 vrele(tvp); 2019 goto unionread; 2020 } 2021 error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), 2022 sizeof(long)); 2023 *retval = SCARG(uap, count) - auio.uio_resid; 2024 return (error); 2025 } 2026 2027 /* 2028 * Set the mode mask for creation of filesystem nodes. 2029 */ 2030 int 2031 sys_umask(p, v, retval) 2032 struct proc *p; 2033 void *v; 2034 register_t *retval; 2035 { 2036 struct sys_umask_args /* { 2037 syscallarg(int) newmask; 2038 } */ *uap = v; 2039 register struct filedesc *fdp; 2040 2041 fdp = p->p_fd; 2042 *retval = fdp->fd_cmask; 2043 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2044 return (0); 2045 } 2046 2047 /* 2048 * Void all references to file by ripping underlying filesystem 2049 * away from vnode. 2050 */ 2051 /* ARGSUSED */ 2052 int 2053 sys_revoke(p, v, retval) 2054 struct proc *p; 2055 void *v; 2056 register_t *retval; 2057 { 2058 register struct sys_revoke_args /* { 2059 syscallarg(char *) path; 2060 } */ *uap = v; 2061 register struct vnode *vp; 2062 struct vattr vattr; 2063 int error; 2064 struct nameidata nd; 2065 2066 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2067 if ((error = namei(&nd)) != 0) 2068 return (error); 2069 vp = nd.ni_vp; 2070 if (vp->v_type != VCHR && vp->v_type != VBLK) { 2071 error = EINVAL; 2072 goto out; 2073 } 2074 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2075 goto out; 2076 if (p->p_ucred->cr_uid != vattr.va_uid && 2077 (error = suser(p->p_ucred, &p->p_acflag))) 2078 goto out; 2079 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2080 vgoneall(vp); 2081 out: 2082 vrele(vp); 2083 return (error); 2084 } 2085 2086 /* 2087 * Convert a user file descriptor to a kernel file entry. 2088 */ 2089 int 2090 getvnode(fdp, fd, fpp) 2091 struct filedesc *fdp; 2092 int fd; 2093 struct file **fpp; 2094 { 2095 struct vnode *vp; 2096 struct file *fp; 2097 2098 if ((u_int)fd >= fdp->fd_nfiles || 2099 (fp = fdp->fd_ofiles[fd]) == NULL) 2100 return (EBADF); 2101 if (fp->f_type != DTYPE_VNODE) 2102 return (EINVAL); 2103 vp = (struct vnode *)fp->f_data; 2104 if (vp->v_type == VBAD) 2105 return (EBADF); 2106 *fpp = fp; 2107 return (0); 2108 } 2109
Indexes created Thu Sep 25 16:09:42 GMT 2025