vfs_syscalls.c revision 1.72
1 /* $NetBSD: vfs_syscalls.c,v 1.72 1996/10/21 17:42:48 jtc Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/namei.h> 46 #include <sys/filedesc.h> 47 #include <sys/kernel.h> 48 #include <sys/file.h> 49 #include <sys/stat.h> 50 #include <sys/vnode.h> 51 #include <sys/mount.h> 52 #include <sys/proc.h> 53 #include <sys/uio.h> 54 #include <sys/malloc.h> 55 #include <sys/dirent.h> 56 57 #include <sys/syscallargs.h> 58 59 #include <vm/vm.h> 60 #include <sys/sysctl.h> 61 62 static int change_dir __P((struct nameidata *, struct proc *)); 63 64 void checkdirs __P((struct vnode *)); 65 int dounmount __P((struct mount *, int, struct proc *)); 66 67 /* 68 * Virtual File System System Calls 69 */ 70 71 /* 72 * Mount a file system. 73 */ 74 /* ARGSUSED */ 75 int 76 sys_mount(p, v, retval) 77 struct proc *p; 78 void *v; 79 register_t *retval; 80 { 81 register struct sys_mount_args /* { 82 syscallarg(char *) type; 83 syscallarg(char *) path; 84 syscallarg(int) flags; 85 syscallarg(caddr_t) data; 86 } */ *uap = v; 87 register struct vnode *vp; 88 register struct mount *mp; 89 int error, flag = 0; 90 u_long fsindex = 0; 91 char fstypename[MFSNAMELEN]; 92 struct vattr va; 93 struct nameidata nd; 94 95 /* 96 * Get vnode to be covered 97 */ 98 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 99 SCARG(uap, path), p); 100 if ((error = namei(&nd)) != 0) 101 return (error); 102 vp = nd.ni_vp; 103 if (SCARG(uap, flags) & MNT_UPDATE) { 104 if ((vp->v_flag & VROOT) == 0) { 105 vput(vp); 106 return (EINVAL); 107 } 108 mp = vp->v_mount; 109 flag = mp->mnt_flag; 110 /* 111 * We only allow the filesystem to be reloaded if it 112 * is currently mounted read-only. 113 */ 114 if ((SCARG(uap, flags) & MNT_RELOAD) && 115 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 116 vput(vp); 117 return (EOPNOTSUPP); /* Needs translation */ 118 } 119 mp->mnt_flag |= 120 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 121 /* 122 * Only root, or the user that did the original mount is 123 * permitted to update it. 124 */ 125 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 126 (error = suser(p->p_ucred, &p->p_acflag))) { 127 vput(vp); 128 return (error); 129 } 130 /* 131 * Do not allow NFS export by non-root users. Silently 132 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 133 */ 134 if (p->p_ucred->cr_uid != 0) { 135 if (SCARG(uap, flags) & MNT_EXPORTED) { 136 vput(vp); 137 return (EPERM); 138 } 139 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 140 } 141 VOP_UNLOCK(vp); 142 goto update; 143 } 144 /* 145 * If the user is not root, ensure that they own the directory 146 * onto which we are attempting to mount. 147 */ 148 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) || 149 (va.va_uid != p->p_ucred->cr_uid && 150 (error = suser(p->p_ucred, &p->p_acflag)))) { 151 vput(vp); 152 return (error); 153 } 154 /* 155 * Do not allow NFS export by non-root users. Silently 156 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 157 */ 158 if (p->p_ucred->cr_uid != 0) { 159 if (SCARG(uap, flags) & MNT_EXPORTED) { 160 vput(vp); 161 return (EPERM); 162 } 163 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 164 } 165 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 166 return (error); 167 if (vp->v_type != VDIR) { 168 vput(vp); 169 return (ENOTDIR); 170 } 171 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 172 if (error) { 173 #if defined(COMPAT_09) || defined(COMPAT_43) 174 /* 175 * Historically filesystem types were identified by number. 176 * If we get an integer for the filesystem type instead of a 177 * string, we check to see if it matches one of the historic 178 * filesystem types. 179 */ 180 fsindex = (u_long)SCARG(uap, type); 181 if (fsindex >= nvfssw || vfssw[fsindex] == NULL) { 182 vput(vp); 183 return (ENODEV); 184 } 185 strncpy(fstypename, vfssw[fsindex]->vfs_name, MFSNAMELEN); 186 #else 187 vput(vp); 188 return (error); 189 #endif 190 } 191 #ifdef COMPAT_10 192 /* Accept `ufs' as an alias for `ffs'. */ 193 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 194 strncpy(fstypename, "ffs", MFSNAMELEN); 195 #endif 196 for (fsindex = 0; fsindex < nvfssw; fsindex++) 197 if (vfssw[fsindex] != NULL && 198 !strncmp(vfssw[fsindex]->vfs_name, fstypename, MFSNAMELEN)) 199 break; 200 if (fsindex >= nvfssw) { 201 vput(vp); 202 return (ENODEV); 203 } 204 if (vp->v_mountedhere != NULL) { 205 vput(vp); 206 return (EBUSY); 207 } 208 209 /* 210 * Allocate and initialize the file system. 211 */ 212 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 213 M_MOUNT, M_WAITOK); 214 bzero((char *)mp, (u_long)sizeof(struct mount)); 215 mp->mnt_op = vfssw[fsindex]; 216 if ((error = vfs_lock(mp)) != 0) { 217 free((caddr_t)mp, M_MOUNT); 218 vput(vp); 219 return (error); 220 } 221 /* Do this early in case we block later. */ 222 vfssw[fsindex]->vfs_refcount++; 223 vp->v_mountedhere = mp; 224 mp->mnt_vnodecovered = vp; 225 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 226 update: 227 /* 228 * Set the mount level flags. 229 */ 230 if (SCARG(uap, flags) & MNT_RDONLY) 231 mp->mnt_flag |= MNT_RDONLY; 232 else if (mp->mnt_flag & MNT_RDONLY) 233 mp->mnt_flag |= MNT_WANTRDWR; 234 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 235 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC); 236 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 237 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC); 238 /* 239 * Mount the filesystem. 240 */ 241 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 242 if (mp->mnt_flag & MNT_UPDATE) { 243 vrele(vp); 244 if (mp->mnt_flag & MNT_WANTRDWR) 245 mp->mnt_flag &= ~MNT_RDONLY; 246 mp->mnt_flag &=~ 247 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 248 if (error) 249 mp->mnt_flag = flag; 250 return (error); 251 } 252 /* 253 * Put the new filesystem on the mount list after root. 254 */ 255 cache_purge(vp); 256 if (!error) { 257 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 258 checkdirs(vp); 259 VOP_UNLOCK(vp); 260 vfs_unlock(mp); 261 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 262 error = VFS_START(mp, 0, p); 263 } else { 264 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 265 vfssw[fsindex]->vfs_refcount--; 266 vfs_unlock(mp); 267 free((caddr_t)mp, M_MOUNT); 268 vput(vp); 269 } 270 return (error); 271 } 272 273 /* 274 * Scan all active processes to see if any of them have a current 275 * or root directory onto which the new filesystem has just been 276 * mounted. If so, replace them with the new mount point. 277 */ 278 void 279 checkdirs(olddp) 280 struct vnode *olddp; 281 { 282 struct filedesc *fdp; 283 struct vnode *newdp; 284 struct proc *p; 285 286 if (olddp->v_usecount == 1) 287 return; 288 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 289 panic("mount: lost mount"); 290 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 291 fdp = p->p_fd; 292 if (fdp->fd_cdir == olddp) { 293 vrele(fdp->fd_cdir); 294 VREF(newdp); 295 fdp->fd_cdir = newdp; 296 } 297 if (fdp->fd_rdir == olddp) { 298 vrele(fdp->fd_rdir); 299 VREF(newdp); 300 fdp->fd_rdir = newdp; 301 } 302 } 303 if (rootvnode == olddp) { 304 vrele(rootvnode); 305 VREF(newdp); 306 rootvnode = newdp; 307 } 308 vput(newdp); 309 } 310 311 /* 312 * Unmount a file system. 313 * 314 * Note: unmount takes a path to the vnode mounted on as argument, 315 * not special file (as before). 316 */ 317 /* ARGSUSED */ 318 int 319 sys_unmount(p, v, retval) 320 struct proc *p; 321 void *v; 322 register_t *retval; 323 { 324 register struct sys_unmount_args /* { 325 syscallarg(char *) path; 326 syscallarg(int) flags; 327 } */ *uap = v; 328 register struct vnode *vp; 329 struct mount *mp; 330 int error; 331 struct nameidata nd; 332 333 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 334 SCARG(uap, path), p); 335 if ((error = namei(&nd)) != 0) 336 return (error); 337 vp = nd.ni_vp; 338 mp = vp->v_mount; 339 340 /* 341 * Only root, or the user that did the original mount is 342 * permitted to unmount this filesystem. 343 */ 344 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 345 (error = suser(p->p_ucred, &p->p_acflag))) { 346 vput(vp); 347 return (error); 348 } 349 350 /* 351 * Don't allow unmounting the root file system. 352 */ 353 if (mp->mnt_flag & MNT_ROOTFS) { 354 vput(vp); 355 return (EINVAL); 356 } 357 358 /* 359 * Must be the root of the filesystem 360 */ 361 if ((vp->v_flag & VROOT) == 0) { 362 vput(vp); 363 return (EINVAL); 364 } 365 vput(vp); 366 return (dounmount(mp, SCARG(uap, flags), p)); 367 } 368 369 /* 370 * Do the actual file system unmount. 371 */ 372 int 373 dounmount(mp, flags, p) 374 register struct mount *mp; 375 int flags; 376 struct proc *p; 377 { 378 struct vnode *coveredvp; 379 int error; 380 381 coveredvp = mp->mnt_vnodecovered; 382 if (vfs_busy(mp)) 383 return (EBUSY); 384 mp->mnt_flag |= MNT_UNMOUNT; 385 if ((error = vfs_lock(mp)) != 0) 386 return (error); 387 388 mp->mnt_flag &=~ MNT_ASYNC; 389 vnode_pager_umount(mp); /* release cached vnodes */ 390 cache_purgevfs(mp); /* remove cache entries for this file sys */ 391 if ((error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0 || 392 (flags & MNT_FORCE)) 393 error = VFS_UNMOUNT(mp, flags, p); 394 mp->mnt_flag &= ~MNT_UNMOUNT; 395 vfs_unbusy(mp); 396 if (error) { 397 vfs_unlock(mp); 398 } else { 399 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 400 if (coveredvp != NULLVP) { 401 vrele(coveredvp); 402 coveredvp->v_mountedhere = (struct mount *)0; 403 } 404 mp->mnt_op->vfs_refcount--; 405 vfs_unlock(mp); 406 if (mp->mnt_vnodelist.lh_first != NULL) 407 panic("unmount: dangling vnode"); 408 free((caddr_t)mp, M_MOUNT); 409 } 410 return (error); 411 } 412 413 /* 414 * Sync each mounted filesystem. 415 */ 416 #ifdef DEBUG 417 int syncprt = 0; 418 struct ctldebug debug0 = { "syncprt", &syncprt }; 419 #endif 420 421 /* ARGSUSED */ 422 int 423 sys_sync(p, v, retval) 424 struct proc *p; 425 void *v; 426 register_t *retval; 427 { 428 register struct mount *mp, *nmp; 429 int asyncflag; 430 431 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 432 /* 433 * Get the next pointer in case we hang on vfs_busy 434 * while we are being unmounted. 435 */ 436 nmp = mp->mnt_list.cqe_next; 437 /* 438 * The lock check below is to avoid races with mount 439 * and unmount. 440 */ 441 if ((mp->mnt_flag & (MNT_MLOCK|MNT_RDONLY|MNT_MPBUSY)) == 0 && 442 !vfs_busy(mp)) { 443 asyncflag = mp->mnt_flag & MNT_ASYNC; 444 mp->mnt_flag &= ~MNT_ASYNC; 445 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 446 if (asyncflag) 447 mp->mnt_flag |= MNT_ASYNC; 448 /* 449 * Get the next pointer again, as the next filesystem 450 * might have been unmounted while we were sync'ing. 451 */ 452 nmp = mp->mnt_list.cqe_next; 453 vfs_unbusy(mp); 454 } 455 } 456 #ifdef DEBUG 457 if (syncprt) 458 vfs_bufstats(); 459 #endif /* DEBUG */ 460 return (0); 461 } 462 463 /* 464 * Change filesystem quotas. 465 */ 466 /* ARGSUSED */ 467 int 468 sys_quotactl(p, v, retval) 469 struct proc *p; 470 void *v; 471 register_t *retval; 472 { 473 register struct sys_quotactl_args /* { 474 syscallarg(char *) path; 475 syscallarg(int) cmd; 476 syscallarg(int) uid; 477 syscallarg(caddr_t) arg; 478 } */ *uap = v; 479 register struct mount *mp; 480 int error; 481 struct nameidata nd; 482 483 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 484 if ((error = namei(&nd)) != 0) 485 return (error); 486 mp = nd.ni_vp->v_mount; 487 vrele(nd.ni_vp); 488 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 489 SCARG(uap, arg), p)); 490 } 491 492 /* 493 * Get filesystem statistics. 494 */ 495 /* ARGSUSED */ 496 int 497 sys_statfs(p, v, retval) 498 struct proc *p; 499 void *v; 500 register_t *retval; 501 { 502 register struct sys_statfs_args /* { 503 syscallarg(char *) path; 504 syscallarg(struct statfs *) buf; 505 } */ *uap = v; 506 register struct mount *mp; 507 register struct statfs *sp; 508 int error; 509 struct nameidata nd; 510 511 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 512 if ((error = namei(&nd)) != 0) 513 return (error); 514 mp = nd.ni_vp->v_mount; 515 sp = &mp->mnt_stat; 516 vrele(nd.ni_vp); 517 if ((error = VFS_STATFS(mp, sp, p)) != 0) 518 return (error); 519 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 520 return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); 521 } 522 523 /* 524 * Get filesystem statistics. 525 */ 526 /* ARGSUSED */ 527 int 528 sys_fstatfs(p, v, retval) 529 struct proc *p; 530 void *v; 531 register_t *retval; 532 { 533 register struct sys_fstatfs_args /* { 534 syscallarg(int) fd; 535 syscallarg(struct statfs *) buf; 536 } */ *uap = v; 537 struct file *fp; 538 struct mount *mp; 539 register struct statfs *sp; 540 int error; 541 542 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 543 return (error); 544 mp = ((struct vnode *)fp->f_data)->v_mount; 545 sp = &mp->mnt_stat; 546 if ((error = VFS_STATFS(mp, sp, p)) != 0) 547 return (error); 548 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 549 return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); 550 } 551 552 /* 553 * Get statistics on all filesystems. 554 */ 555 int 556 sys_getfsstat(p, v, retval) 557 struct proc *p; 558 void *v; 559 register_t *retval; 560 { 561 register struct sys_getfsstat_args /* { 562 syscallarg(struct statfs *) buf; 563 syscallarg(long) bufsize; 564 syscallarg(int) flags; 565 } */ *uap = v; 566 register struct mount *mp, *nmp; 567 register struct statfs *sp; 568 caddr_t sfsp; 569 long count, maxcount, error; 570 571 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 572 sfsp = (caddr_t)SCARG(uap, buf); 573 for (count = 0, 574 mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 575 nmp = mp->mnt_list.cqe_next; 576 if (sfsp && count < maxcount && 577 ((mp->mnt_flag & MNT_MLOCK) == 0)) { 578 sp = &mp->mnt_stat; 579 /* 580 * If MNT_NOWAIT is specified, do not refresh the 581 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 582 */ 583 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 584 (SCARG(uap, flags) & MNT_WAIT)) && 585 (error = VFS_STATFS(mp, sp, p))) 586 continue; 587 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 588 error = copyout((caddr_t)sp, sfsp, sizeof(*sp)); 589 if (error) 590 return (error); 591 sfsp += sizeof(*sp); 592 } 593 count++; 594 } 595 if (sfsp && count > maxcount) 596 *retval = maxcount; 597 else 598 *retval = count; 599 return (0); 600 } 601 602 /* 603 * Change current working directory to a given file descriptor. 604 */ 605 /* ARGSUSED */ 606 int 607 sys_fchdir(p, v, retval) 608 struct proc *p; 609 void *v; 610 register_t *retval; 611 { 612 struct sys_fchdir_args /* { 613 syscallarg(int) fd; 614 } */ *uap = v; 615 register struct filedesc *fdp = p->p_fd; 616 struct vnode *vp, *tdp; 617 struct mount *mp; 618 struct file *fp; 619 int error; 620 621 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 622 return (error); 623 vp = (struct vnode *)fp->f_data; 624 VREF(vp); 625 VOP_LOCK(vp); 626 if (vp->v_type != VDIR) 627 error = ENOTDIR; 628 else 629 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 630 while (!error && (mp = vp->v_mountedhere) != NULL) { 631 if (mp->mnt_flag & MNT_MLOCK) { 632 mp->mnt_flag |= MNT_MWAIT; 633 sleep((caddr_t)mp, PVFS); 634 continue; 635 } 636 if ((error = VFS_ROOT(mp, &tdp)) != 0) 637 break; 638 vput(vp); 639 vp = tdp; 640 } 641 VOP_UNLOCK(vp); 642 if (error) { 643 vrele(vp); 644 return (error); 645 } 646 vrele(fdp->fd_cdir); 647 fdp->fd_cdir = vp; 648 return (0); 649 } 650 651 /* 652 * Change current working directory (``.''). 653 */ 654 /* ARGSUSED */ 655 int 656 sys_chdir(p, v, retval) 657 struct proc *p; 658 void *v; 659 register_t *retval; 660 { 661 struct sys_chdir_args /* { 662 syscallarg(char *) path; 663 } */ *uap = v; 664 register struct filedesc *fdp = p->p_fd; 665 int error; 666 struct nameidata nd; 667 668 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 669 SCARG(uap, path), p); 670 if ((error = change_dir(&nd, p)) != 0) 671 return (error); 672 vrele(fdp->fd_cdir); 673 fdp->fd_cdir = nd.ni_vp; 674 return (0); 675 } 676 677 /* 678 * Change notion of root (``/'') directory. 679 */ 680 /* ARGSUSED */ 681 int 682 sys_chroot(p, v, retval) 683 struct proc *p; 684 void *v; 685 register_t *retval; 686 { 687 struct sys_chroot_args /* { 688 syscallarg(char *) path; 689 } */ *uap = v; 690 register struct filedesc *fdp = p->p_fd; 691 int error; 692 struct nameidata nd; 693 694 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 695 return (error); 696 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 697 SCARG(uap, path), p); 698 if ((error = change_dir(&nd, p)) != 0) 699 return (error); 700 if (fdp->fd_rdir != NULL) 701 vrele(fdp->fd_rdir); 702 fdp->fd_rdir = nd.ni_vp; 703 return (0); 704 } 705 706 /* 707 * Common routine for chroot and chdir. 708 */ 709 static int 710 change_dir(ndp, p) 711 register struct nameidata *ndp; 712 struct proc *p; 713 { 714 struct vnode *vp; 715 int error; 716 717 if ((error = namei(ndp)) != 0) 718 return (error); 719 vp = ndp->ni_vp; 720 if (vp->v_type != VDIR) 721 error = ENOTDIR; 722 else 723 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 724 VOP_UNLOCK(vp); 725 if (error) 726 vrele(vp); 727 return (error); 728 } 729 730 /* 731 * Check permissions, allocate an open file structure, 732 * and call the device open routine if any. 733 */ 734 int 735 sys_open(p, v, retval) 736 struct proc *p; 737 void *v; 738 register_t *retval; 739 { 740 register struct sys_open_args /* { 741 syscallarg(char *) path; 742 syscallarg(int) flags; 743 syscallarg(int) mode; 744 } */ *uap = v; 745 register struct filedesc *fdp = p->p_fd; 746 register struct file *fp; 747 register struct vnode *vp; 748 int flags, cmode; 749 struct file *nfp; 750 int type, indx, error; 751 struct flock lf; 752 struct nameidata nd; 753 extern struct fileops vnops; 754 755 if ((error = falloc(p, &nfp, &indx)) != 0) 756 return (error); 757 fp = nfp; 758 flags = FFLAGS(SCARG(uap, flags)); 759 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 760 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 761 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 762 if ((error = vn_open(&nd, flags, cmode)) != 0) { 763 ffree(fp); 764 if ((error == ENODEV || error == ENXIO) && 765 p->p_dupfd >= 0 && /* XXX from fdopen */ 766 (error = 767 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 768 *retval = indx; 769 return (0); 770 } 771 if (error == ERESTART) 772 error = EINTR; 773 fdp->fd_ofiles[indx] = NULL; 774 return (error); 775 } 776 p->p_dupfd = 0; 777 vp = nd.ni_vp; 778 fp->f_flag = flags & FMASK; 779 fp->f_type = DTYPE_VNODE; 780 fp->f_ops = &vnops; 781 fp->f_data = (caddr_t)vp; 782 if (flags & (O_EXLOCK | O_SHLOCK)) { 783 lf.l_whence = SEEK_SET; 784 lf.l_start = 0; 785 lf.l_len = 0; 786 if (flags & O_EXLOCK) 787 lf.l_type = F_WRLCK; 788 else 789 lf.l_type = F_RDLCK; 790 type = F_FLOCK; 791 if ((flags & FNONBLOCK) == 0) 792 type |= F_WAIT; 793 VOP_UNLOCK(vp); 794 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 795 if (error) { 796 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 797 ffree(fp); 798 fdp->fd_ofiles[indx] = NULL; 799 return (error); 800 } 801 VOP_LOCK(vp); 802 fp->f_flag |= FHASLOCK; 803 } 804 VOP_UNLOCK(vp); 805 *retval = indx; 806 return (0); 807 } 808 809 /* 810 * Create a special file. 811 */ 812 /* ARGSUSED */ 813 int 814 sys_mknod(p, v, retval) 815 struct proc *p; 816 void *v; 817 register_t *retval; 818 { 819 register struct sys_mknod_args /* { 820 syscallarg(char *) path; 821 syscallarg(int) mode; 822 syscallarg(int) dev; 823 } */ *uap = v; 824 register struct vnode *vp; 825 struct vattr vattr; 826 int error; 827 int whiteout = 0; 828 struct nameidata nd; 829 830 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 831 return (error); 832 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 833 if ((error = namei(&nd)) != 0) 834 return (error); 835 vp = nd.ni_vp; 836 if (vp != NULL) 837 error = EEXIST; 838 else { 839 VATTR_NULL(&vattr); 840 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 841 vattr.va_rdev = SCARG(uap, dev); 842 whiteout = 0; 843 844 switch (SCARG(uap, mode) & S_IFMT) { 845 case S_IFMT: /* used by badsect to flag bad sectors */ 846 vattr.va_type = VBAD; 847 break; 848 case S_IFCHR: 849 vattr.va_type = VCHR; 850 break; 851 case S_IFBLK: 852 vattr.va_type = VBLK; 853 break; 854 case S_IFWHT: 855 whiteout = 1; 856 break; 857 default: 858 error = EINVAL; 859 break; 860 } 861 } 862 if (!error) { 863 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 864 if (whiteout) { 865 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 866 if (error) 867 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 868 vput(nd.ni_dvp); 869 } else { 870 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 871 &nd.ni_cnd, &vattr); 872 } 873 } else { 874 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 875 if (nd.ni_dvp == vp) 876 vrele(nd.ni_dvp); 877 else 878 vput(nd.ni_dvp); 879 if (vp) 880 vrele(vp); 881 } 882 return (error); 883 } 884 885 /* 886 * Create a named pipe. 887 */ 888 /* ARGSUSED */ 889 int 890 sys_mkfifo(p, v, retval) 891 struct proc *p; 892 void *v; 893 register_t *retval; 894 { 895 #ifndef FIFO 896 return (EOPNOTSUPP); 897 #else 898 register struct sys_mkfifo_args /* { 899 syscallarg(char *) path; 900 syscallarg(int) mode; 901 } */ *uap = v; 902 struct vattr vattr; 903 int error; 904 struct nameidata nd; 905 906 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 907 if ((error = namei(&nd)) != 0) 908 return (error); 909 if (nd.ni_vp != NULL) { 910 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 911 if (nd.ni_dvp == nd.ni_vp) 912 vrele(nd.ni_dvp); 913 else 914 vput(nd.ni_dvp); 915 vrele(nd.ni_vp); 916 return (EEXIST); 917 } 918 VATTR_NULL(&vattr); 919 vattr.va_type = VFIFO; 920 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 921 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 922 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 923 #endif /* FIFO */ 924 } 925 926 /* 927 * Make a hard file link. 928 */ 929 /* ARGSUSED */ 930 int 931 sys_link(p, v, retval) 932 struct proc *p; 933 void *v; 934 register_t *retval; 935 { 936 register struct sys_link_args /* { 937 syscallarg(char *) path; 938 syscallarg(char *) link; 939 } */ *uap = v; 940 register struct vnode *vp; 941 struct nameidata nd; 942 int error; 943 944 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 945 if ((error = namei(&nd)) != 0) 946 return (error); 947 vp = nd.ni_vp; 948 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 949 if ((error = namei(&nd)) != 0) 950 goto out; 951 if (nd.ni_vp) { 952 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 953 if (nd.ni_dvp == nd.ni_vp) 954 vrele(nd.ni_dvp); 955 else 956 vput(nd.ni_dvp); 957 vrele(nd.ni_vp); 958 error = EEXIST; 959 goto out; 960 } 961 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 962 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 963 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 964 out: 965 vrele(vp); 966 return (error); 967 } 968 969 /* 970 * Make a symbolic link. 971 */ 972 /* ARGSUSED */ 973 int 974 sys_symlink(p, v, retval) 975 struct proc *p; 976 void *v; 977 register_t *retval; 978 { 979 register struct sys_symlink_args /* { 980 syscallarg(char *) path; 981 syscallarg(char *) link; 982 } */ *uap = v; 983 struct vattr vattr; 984 char *path; 985 int error; 986 struct nameidata nd; 987 988 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 989 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 990 if (error) 991 goto out; 992 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 993 if ((error = namei(&nd)) != 0) 994 goto out; 995 if (nd.ni_vp) { 996 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 997 if (nd.ni_dvp == nd.ni_vp) 998 vrele(nd.ni_dvp); 999 else 1000 vput(nd.ni_dvp); 1001 vrele(nd.ni_vp); 1002 error = EEXIST; 1003 goto out; 1004 } 1005 VATTR_NULL(&vattr); 1006 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1007 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1008 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1009 out: 1010 FREE(path, M_NAMEI); 1011 return (error); 1012 } 1013 1014 /* 1015 * Delete a whiteout from the filesystem. 1016 */ 1017 /* ARGSUSED */ 1018 int 1019 sys_undelete(p, v, retval) 1020 struct proc *p; 1021 void *v; 1022 register_t *retval; 1023 { 1024 register struct sys_undelete_args /* { 1025 syscallarg(char *) path; 1026 } */ *uap = v; 1027 int error; 1028 struct nameidata nd; 1029 1030 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1031 SCARG(uap, path), p); 1032 error = namei(&nd); 1033 if (error) 1034 return (error); 1035 1036 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1037 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1038 if (nd.ni_dvp == nd.ni_vp) 1039 vrele(nd.ni_dvp); 1040 else 1041 vput(nd.ni_dvp); 1042 if (nd.ni_vp) 1043 vrele(nd.ni_vp); 1044 return (EEXIST); 1045 } 1046 1047 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1048 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1049 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1050 vput(nd.ni_dvp); 1051 return (error); 1052 } 1053 1054 /* 1055 * Delete a name from the filesystem. 1056 */ 1057 /* ARGSUSED */ 1058 int 1059 sys_unlink(p, v, retval) 1060 struct proc *p; 1061 void *v; 1062 register_t *retval; 1063 { 1064 struct sys_unlink_args /* { 1065 syscallarg(char *) path; 1066 } */ *uap = v; 1067 register struct vnode *vp; 1068 int error; 1069 struct nameidata nd; 1070 1071 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1072 SCARG(uap, path), p); 1073 if ((error = namei(&nd)) != 0) 1074 return (error); 1075 vp = nd.ni_vp; 1076 1077 /* 1078 * The root of a mounted filesystem cannot be deleted. 1079 */ 1080 if (vp->v_flag & VROOT) { 1081 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1082 if (nd.ni_dvp == vp) 1083 vrele(nd.ni_dvp); 1084 else 1085 vput(nd.ni_dvp); 1086 vput(vp); 1087 error = EBUSY; 1088 goto out; 1089 } 1090 1091 (void)vnode_pager_uncache(vp); 1092 1093 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1094 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1095 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1096 out: 1097 return (error); 1098 } 1099 1100 /* 1101 * Reposition read/write file offset. 1102 */ 1103 int 1104 sys_lseek(p, v, retval) 1105 struct proc *p; 1106 void *v; 1107 register_t *retval; 1108 { 1109 register struct sys_lseek_args /* { 1110 syscallarg(int) fd; 1111 syscallarg(int) pad; 1112 syscallarg(off_t) offset; 1113 syscallarg(int) whence; 1114 } */ *uap = v; 1115 struct ucred *cred = p->p_ucred; 1116 register struct filedesc *fdp = p->p_fd; 1117 register struct file *fp; 1118 struct vattr vattr; 1119 int error; 1120 1121 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1122 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1123 return (EBADF); 1124 if (fp->f_type != DTYPE_VNODE 1125 #ifdef FIFO 1126 || ((struct vnode *)fp->f_data)->v_type == VFIFO 1127 #endif 1128 ) 1129 return (ESPIPE); 1130 switch (SCARG(uap, whence)) { 1131 case L_INCR: 1132 fp->f_offset += SCARG(uap, offset); 1133 break; 1134 case L_XTND: 1135 error = VOP_GETATTR((struct vnode *)fp->f_data, &vattr, 1136 cred, p); 1137 if (error) 1138 return (error); 1139 fp->f_offset = SCARG(uap, offset) + vattr.va_size; 1140 break; 1141 case L_SET: 1142 fp->f_offset = SCARG(uap, offset); 1143 break; 1144 default: 1145 return (EINVAL); 1146 } 1147 *(off_t *)retval = fp->f_offset; 1148 return (0); 1149 } 1150 1151 /* 1152 * Check access permissions. 1153 */ 1154 int 1155 sys_access(p, v, retval) 1156 struct proc *p; 1157 void *v; 1158 register_t *retval; 1159 { 1160 register struct sys_access_args /* { 1161 syscallarg(char *) path; 1162 syscallarg(int) flags; 1163 } */ *uap = v; 1164 register struct ucred *cred = p->p_ucred; 1165 register struct vnode *vp; 1166 int error, flags, t_gid, t_uid; 1167 struct nameidata nd; 1168 1169 t_uid = cred->cr_uid; 1170 t_gid = cred->cr_gid; 1171 cred->cr_uid = p->p_cred->p_ruid; 1172 cred->cr_gid = p->p_cred->p_rgid; 1173 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1174 SCARG(uap, path), p); 1175 if ((error = namei(&nd)) != 0) 1176 goto out1; 1177 vp = nd.ni_vp; 1178 1179 /* Flags == 0 means only check for existence. */ 1180 if (SCARG(uap, flags)) { 1181 flags = 0; 1182 if (SCARG(uap, flags) & R_OK) 1183 flags |= VREAD; 1184 if (SCARG(uap, flags) & W_OK) 1185 flags |= VWRITE; 1186 if (SCARG(uap, flags) & X_OK) 1187 flags |= VEXEC; 1188 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1189 error = VOP_ACCESS(vp, flags, cred, p); 1190 } 1191 vput(vp); 1192 out1: 1193 cred->cr_uid = t_uid; 1194 cred->cr_gid = t_gid; 1195 return (error); 1196 } 1197 1198 /* 1199 * Get file status; this version follows links. 1200 */ 1201 /* ARGSUSED */ 1202 int 1203 sys_stat(p, v, retval) 1204 struct proc *p; 1205 void *v; 1206 register_t *retval; 1207 { 1208 register struct sys_stat_args /* { 1209 syscallarg(char *) path; 1210 syscallarg(struct stat *) ub; 1211 } */ *uap = v; 1212 struct stat sb; 1213 int error; 1214 struct nameidata nd; 1215 1216 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1217 SCARG(uap, path), p); 1218 if ((error = namei(&nd)) != 0) 1219 return (error); 1220 error = vn_stat(nd.ni_vp, &sb, p); 1221 vput(nd.ni_vp); 1222 if (error) 1223 return (error); 1224 error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); 1225 return (error); 1226 } 1227 1228 /* 1229 * Get file status; this version does not follow links. 1230 */ 1231 /* ARGSUSED */ 1232 int 1233 sys_lstat(p, v, retval) 1234 struct proc *p; 1235 void *v; 1236 register_t *retval; 1237 { 1238 register struct sys_lstat_args /* { 1239 syscallarg(char *) path; 1240 syscallarg(struct stat *) ub; 1241 } */ *uap = v; 1242 struct stat sb; 1243 int error; 1244 struct nameidata nd; 1245 1246 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1247 SCARG(uap, path), p); 1248 if ((error = namei(&nd)) != 0) 1249 return (error); 1250 error = vn_stat(nd.ni_vp, &sb, p); 1251 vput(nd.ni_vp); 1252 if (error) 1253 return (error); 1254 error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); 1255 return (error); 1256 } 1257 1258 /* 1259 * Get configurable pathname variables. 1260 */ 1261 /* ARGSUSED */ 1262 int 1263 sys_pathconf(p, v, retval) 1264 struct proc *p; 1265 void *v; 1266 register_t *retval; 1267 { 1268 register struct sys_pathconf_args /* { 1269 syscallarg(char *) path; 1270 syscallarg(int) name; 1271 } */ *uap = v; 1272 int error; 1273 struct nameidata nd; 1274 1275 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1276 SCARG(uap, path), p); 1277 if ((error = namei(&nd)) != 0) 1278 return (error); 1279 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1280 vput(nd.ni_vp); 1281 return (error); 1282 } 1283 1284 /* 1285 * Return target name of a symbolic link. 1286 */ 1287 /* ARGSUSED */ 1288 int 1289 sys_readlink(p, v, retval) 1290 struct proc *p; 1291 void *v; 1292 register_t *retval; 1293 { 1294 register struct sys_readlink_args /* { 1295 syscallarg(char *) path; 1296 syscallarg(char *) buf; 1297 syscallarg(int) count; 1298 } */ *uap = v; 1299 register struct vnode *vp; 1300 struct iovec aiov; 1301 struct uio auio; 1302 int error; 1303 struct nameidata nd; 1304 1305 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1306 SCARG(uap, path), p); 1307 if ((error = namei(&nd)) != 0) 1308 return (error); 1309 vp = nd.ni_vp; 1310 if (vp->v_type != VLNK) 1311 error = EINVAL; 1312 else { 1313 aiov.iov_base = SCARG(uap, buf); 1314 aiov.iov_len = SCARG(uap, count); 1315 auio.uio_iov = &aiov; 1316 auio.uio_iovcnt = 1; 1317 auio.uio_offset = 0; 1318 auio.uio_rw = UIO_READ; 1319 auio.uio_segflg = UIO_USERSPACE; 1320 auio.uio_procp = p; 1321 auio.uio_resid = SCARG(uap, count); 1322 error = VOP_READLINK(vp, &auio, p->p_ucred); 1323 } 1324 vput(vp); 1325 *retval = SCARG(uap, count) - auio.uio_resid; 1326 return (error); 1327 } 1328 1329 /* 1330 * Change flags of a file given a path name. 1331 */ 1332 /* ARGSUSED */ 1333 int 1334 sys_chflags(p, v, retval) 1335 struct proc *p; 1336 void *v; 1337 register_t *retval; 1338 { 1339 register struct sys_chflags_args /* { 1340 syscallarg(char *) path; 1341 syscallarg(int) flags; 1342 } */ *uap = v; 1343 register struct vnode *vp; 1344 struct vattr vattr; 1345 int error; 1346 struct nameidata nd; 1347 1348 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1349 if ((error = namei(&nd)) != 0) 1350 return (error); 1351 vp = nd.ni_vp; 1352 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1353 VOP_LOCK(vp); 1354 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1355 error = EROFS; 1356 else { 1357 VATTR_NULL(&vattr); 1358 vattr.va_flags = SCARG(uap, flags); 1359 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1360 } 1361 vput(vp); 1362 return (error); 1363 } 1364 1365 /* 1366 * Change flags of a file given a file descriptor. 1367 */ 1368 /* ARGSUSED */ 1369 int 1370 sys_fchflags(p, v, retval) 1371 struct proc *p; 1372 void *v; 1373 register_t *retval; 1374 { 1375 register struct sys_fchflags_args /* { 1376 syscallarg(int) fd; 1377 syscallarg(int) flags; 1378 } */ *uap = v; 1379 struct vattr vattr; 1380 struct vnode *vp; 1381 struct file *fp; 1382 int error; 1383 1384 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1385 return (error); 1386 vp = (struct vnode *)fp->f_data; 1387 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1388 VOP_LOCK(vp); 1389 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1390 error = EROFS; 1391 else { 1392 VATTR_NULL(&vattr); 1393 vattr.va_flags = SCARG(uap, flags); 1394 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1395 } 1396 VOP_UNLOCK(vp); 1397 return (error); 1398 } 1399 1400 /* 1401 * Change mode of a file given path name. 1402 */ 1403 /* ARGSUSED */ 1404 int 1405 sys_chmod(p, v, retval) 1406 struct proc *p; 1407 void *v; 1408 register_t *retval; 1409 { 1410 register struct sys_chmod_args /* { 1411 syscallarg(char *) path; 1412 syscallarg(int) mode; 1413 } */ *uap = v; 1414 register struct vnode *vp; 1415 struct vattr vattr; 1416 int error; 1417 struct nameidata nd; 1418 1419 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1420 if ((error = namei(&nd)) != 0) 1421 return (error); 1422 vp = nd.ni_vp; 1423 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1424 VOP_LOCK(vp); 1425 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1426 error = EROFS; 1427 else { 1428 VATTR_NULL(&vattr); 1429 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1430 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1431 } 1432 vput(vp); 1433 return (error); 1434 } 1435 1436 /* 1437 * Change mode of a file given a file descriptor. 1438 */ 1439 /* ARGSUSED */ 1440 int 1441 sys_fchmod(p, v, retval) 1442 struct proc *p; 1443 void *v; 1444 register_t *retval; 1445 { 1446 register struct sys_fchmod_args /* { 1447 syscallarg(int) fd; 1448 syscallarg(int) mode; 1449 } */ *uap = v; 1450 struct vattr vattr; 1451 struct vnode *vp; 1452 struct file *fp; 1453 int error; 1454 1455 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1456 return (error); 1457 vp = (struct vnode *)fp->f_data; 1458 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1459 VOP_LOCK(vp); 1460 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1461 error = EROFS; 1462 else { 1463 VATTR_NULL(&vattr); 1464 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1465 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1466 } 1467 VOP_UNLOCK(vp); 1468 return (error); 1469 } 1470 1471 /* 1472 * Set ownership given a path name. 1473 */ 1474 /* ARGSUSED */ 1475 int 1476 sys_chown(p, v, retval) 1477 struct proc *p; 1478 void *v; 1479 register_t *retval; 1480 { 1481 register struct sys_chown_args /* { 1482 syscallarg(char *) path; 1483 syscallarg(int) uid; 1484 syscallarg(int) gid; 1485 } */ *uap = v; 1486 register struct vnode *vp; 1487 struct vattr vattr; 1488 int error; 1489 struct nameidata nd; 1490 1491 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1492 if ((error = namei(&nd)) != 0) 1493 return (error); 1494 vp = nd.ni_vp; 1495 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1496 VOP_LOCK(vp); 1497 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1498 error = EROFS; 1499 else { 1500 VATTR_NULL(&vattr); 1501 vattr.va_uid = SCARG(uap, uid); 1502 vattr.va_gid = SCARG(uap, gid); 1503 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1504 } 1505 vput(vp); 1506 return (error); 1507 } 1508 1509 /* 1510 * Set ownership given a file descriptor. 1511 */ 1512 /* ARGSUSED */ 1513 int 1514 sys_fchown(p, v, retval) 1515 struct proc *p; 1516 void *v; 1517 register_t *retval; 1518 { 1519 register struct sys_fchown_args /* { 1520 syscallarg(int) fd; 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 file *fp; 1528 1529 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1530 return (error); 1531 vp = (struct vnode *)fp->f_data; 1532 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1533 VOP_LOCK(vp); 1534 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1535 error = EROFS; 1536 else { 1537 VATTR_NULL(&vattr); 1538 vattr.va_uid = SCARG(uap, uid); 1539 vattr.va_gid = SCARG(uap, gid); 1540 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1541 } 1542 VOP_UNLOCK(vp); 1543 return (error); 1544 } 1545 1546 /* 1547 * Set the access and modification times given a path name. 1548 */ 1549 /* ARGSUSED */ 1550 int 1551 sys_utimes(p, v, retval) 1552 struct proc *p; 1553 void *v; 1554 register_t *retval; 1555 { 1556 register struct sys_utimes_args /* { 1557 syscallarg(char *) path; 1558 syscallarg(struct timeval *) tptr; 1559 } */ *uap = v; 1560 register struct vnode *vp; 1561 struct timeval tv[2]; 1562 struct vattr vattr; 1563 int error; 1564 struct nameidata nd; 1565 1566 VATTR_NULL(&vattr); 1567 if (SCARG(uap, tptr) == NULL) { 1568 microtime(&tv[0]); 1569 tv[1] = tv[0]; 1570 vattr.va_vaflags |= VA_UTIMES_NULL; 1571 } else { 1572 error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv, 1573 sizeof (tv)); 1574 if (error) 1575 return (error); 1576 } 1577 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1578 if ((error = namei(&nd)) != 0) 1579 return (error); 1580 vp = nd.ni_vp; 1581 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1582 VOP_LOCK(vp); 1583 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1584 error = EROFS; 1585 else { 1586 vattr.va_atime.tv_sec = tv[0].tv_sec; 1587 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1588 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1589 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1590 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1591 } 1592 vput(vp); 1593 return (error); 1594 } 1595 1596 /* 1597 * Set the access and modification times given a file descriptor. 1598 */ 1599 /* ARGSUSED */ 1600 int 1601 sys_futimes(p, v, retval) 1602 struct proc *p; 1603 void *v; 1604 register_t *retval; 1605 { 1606 register struct sys_futimes_args /* { 1607 syscallarg(int) fd; 1608 syscallarg(struct timeval *) tptr; 1609 } */ *uap = v; 1610 register struct vnode *vp; 1611 struct timeval tv[2]; 1612 struct vattr vattr; 1613 int error; 1614 struct file *fp; 1615 1616 VATTR_NULL(&vattr); 1617 if (SCARG(uap, tptr) == NULL) { 1618 microtime(&tv[0]); 1619 tv[1] = tv[0]; 1620 vattr.va_vaflags |= VA_UTIMES_NULL; 1621 } else { 1622 error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv, 1623 sizeof (tv)); 1624 if (error) 1625 return (error); 1626 } 1627 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1628 return (error); 1629 vp = (struct vnode *)fp->f_data; 1630 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1631 VOP_LOCK(vp); 1632 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1633 error = EROFS; 1634 else { 1635 vattr.va_atime.tv_sec = tv[0].tv_sec; 1636 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1637 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1638 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1639 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1640 } 1641 VOP_UNLOCK(vp); 1642 return (error); 1643 } 1644 1645 /* 1646 * Truncate a file given its path name. 1647 */ 1648 /* ARGSUSED */ 1649 int 1650 sys_truncate(p, v, retval) 1651 struct proc *p; 1652 void *v; 1653 register_t *retval; 1654 { 1655 register struct sys_truncate_args /* { 1656 syscallarg(char *) path; 1657 syscallarg(int) pad; 1658 syscallarg(off_t) length; 1659 } */ *uap = v; 1660 register struct vnode *vp; 1661 struct vattr vattr; 1662 int error; 1663 struct nameidata nd; 1664 1665 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1666 if ((error = namei(&nd)) != 0) 1667 return (error); 1668 vp = nd.ni_vp; 1669 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1670 VOP_LOCK(vp); 1671 if (vp->v_type == VDIR) 1672 error = EISDIR; 1673 else if ((error = vn_writechk(vp)) == 0 && 1674 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1675 VATTR_NULL(&vattr); 1676 vattr.va_size = SCARG(uap, length); 1677 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1678 } 1679 vput(vp); 1680 return (error); 1681 } 1682 1683 /* 1684 * Truncate a file given a file descriptor. 1685 */ 1686 /* ARGSUSED */ 1687 int 1688 sys_ftruncate(p, v, retval) 1689 struct proc *p; 1690 void *v; 1691 register_t *retval; 1692 { 1693 register struct sys_ftruncate_args /* { 1694 syscallarg(int) fd; 1695 syscallarg(int) pad; 1696 syscallarg(off_t) length; 1697 } */ *uap = v; 1698 struct vattr vattr; 1699 struct vnode *vp; 1700 struct file *fp; 1701 int error; 1702 1703 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1704 return (error); 1705 if ((fp->f_flag & FWRITE) == 0) 1706 return (EINVAL); 1707 vp = (struct vnode *)fp->f_data; 1708 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1709 VOP_LOCK(vp); 1710 if (vp->v_type == VDIR) 1711 error = EISDIR; 1712 else if ((error = vn_writechk(vp)) == 0) { 1713 VATTR_NULL(&vattr); 1714 vattr.va_size = SCARG(uap, length); 1715 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1716 } 1717 VOP_UNLOCK(vp); 1718 return (error); 1719 } 1720 1721 /* 1722 * Sync an open file. 1723 */ 1724 /* ARGSUSED */ 1725 int 1726 sys_fsync(p, v, retval) 1727 struct proc *p; 1728 void *v; 1729 register_t *retval; 1730 { 1731 struct sys_fsync_args /* { 1732 syscallarg(int) fd; 1733 } */ *uap = v; 1734 register struct vnode *vp; 1735 struct file *fp; 1736 int error; 1737 1738 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1739 return (error); 1740 vp = (struct vnode *)fp->f_data; 1741 VOP_LOCK(vp); 1742 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p); 1743 VOP_UNLOCK(vp); 1744 return (error); 1745 } 1746 1747 /* 1748 * Rename files. Source and destination must either both be directories, 1749 * or both not be directories. If target is a directory, it must be empty. 1750 */ 1751 /* ARGSUSED */ 1752 int 1753 sys_rename(p, v, retval) 1754 struct proc *p; 1755 void *v; 1756 register_t *retval; 1757 { 1758 register struct sys_rename_args /* { 1759 syscallarg(char *) from; 1760 syscallarg(char *) to; 1761 } */ *uap = v; 1762 register struct vnode *tvp, *fvp, *tdvp; 1763 struct nameidata fromnd, tond; 1764 int error; 1765 1766 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 1767 SCARG(uap, from), p); 1768 if ((error = namei(&fromnd)) != 0) 1769 return (error); 1770 fvp = fromnd.ni_vp; 1771 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 1772 UIO_USERSPACE, SCARG(uap, to), p); 1773 if ((error = namei(&tond)) != 0) { 1774 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1775 vrele(fromnd.ni_dvp); 1776 vrele(fvp); 1777 goto out1; 1778 } 1779 tdvp = tond.ni_dvp; 1780 tvp = tond.ni_vp; 1781 if (tvp != NULL) { 1782 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 1783 error = ENOTDIR; 1784 goto out; 1785 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 1786 error = EISDIR; 1787 goto out; 1788 } 1789 } 1790 if (fvp == tdvp) 1791 error = EINVAL; 1792 /* 1793 * If source is the same as the destination (that is the 1794 * same inode number with the same name in the same directory), 1795 * then there is nothing to do. 1796 */ 1797 if (fvp == tvp && fromnd.ni_dvp == tdvp && 1798 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 1799 !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, 1800 fromnd.ni_cnd.cn_namelen)) 1801 error = -1; 1802 out: 1803 if (!error) { 1804 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 1805 if (fromnd.ni_dvp != tdvp) 1806 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1807 if (tvp) 1808 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 1809 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 1810 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 1811 } else { 1812 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 1813 if (tdvp == tvp) 1814 vrele(tdvp); 1815 else 1816 vput(tdvp); 1817 if (tvp) 1818 vput(tvp); 1819 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1820 vrele(fromnd.ni_dvp); 1821 vrele(fvp); 1822 } 1823 vrele(tond.ni_startdir); 1824 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 1825 out1: 1826 if (fromnd.ni_startdir) 1827 vrele(fromnd.ni_startdir); 1828 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 1829 if (error == -1) 1830 return (0); 1831 return (error); 1832 } 1833 1834 /* 1835 * Make a directory file. 1836 */ 1837 /* ARGSUSED */ 1838 int 1839 sys_mkdir(p, v, retval) 1840 struct proc *p; 1841 void *v; 1842 register_t *retval; 1843 { 1844 register struct sys_mkdir_args /* { 1845 syscallarg(char *) path; 1846 syscallarg(int) mode; 1847 } */ *uap = v; 1848 register struct vnode *vp; 1849 struct vattr vattr; 1850 int error; 1851 struct nameidata nd; 1852 1853 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1854 if ((error = namei(&nd)) != 0) 1855 return (error); 1856 vp = nd.ni_vp; 1857 if (vp != NULL) { 1858 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1859 if (nd.ni_dvp == vp) 1860 vrele(nd.ni_dvp); 1861 else 1862 vput(nd.ni_dvp); 1863 vrele(vp); 1864 return (EEXIST); 1865 } 1866 VATTR_NULL(&vattr); 1867 vattr.va_type = VDIR; 1868 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 1869 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1870 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1871 if (!error) 1872 vput(nd.ni_vp); 1873 return (error); 1874 } 1875 1876 /* 1877 * Remove a directory file. 1878 */ 1879 /* ARGSUSED */ 1880 int 1881 sys_rmdir(p, v, retval) 1882 struct proc *p; 1883 void *v; 1884 register_t *retval; 1885 { 1886 struct sys_rmdir_args /* { 1887 syscallarg(char *) path; 1888 } */ *uap = v; 1889 register struct vnode *vp; 1890 int error; 1891 struct nameidata nd; 1892 1893 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1894 SCARG(uap, path), p); 1895 if ((error = namei(&nd)) != 0) 1896 return (error); 1897 vp = nd.ni_vp; 1898 if (vp->v_type != VDIR) { 1899 error = ENOTDIR; 1900 goto out; 1901 } 1902 /* 1903 * No rmdir "." please. 1904 */ 1905 if (nd.ni_dvp == vp) { 1906 error = EINVAL; 1907 goto out; 1908 } 1909 /* 1910 * The root of a mounted filesystem cannot be deleted. 1911 */ 1912 if (vp->v_flag & VROOT) 1913 error = EBUSY; 1914 out: 1915 if (!error) { 1916 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1917 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1918 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1919 } else { 1920 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1921 if (nd.ni_dvp == vp) 1922 vrele(nd.ni_dvp); 1923 else 1924 vput(nd.ni_dvp); 1925 vput(vp); 1926 } 1927 return (error); 1928 } 1929 1930 /* 1931 * Read a block of directory entries in a file system independent format. 1932 */ 1933 int 1934 sys_getdirentries(p, v, retval) 1935 struct proc *p; 1936 void *v; 1937 register_t *retval; 1938 { 1939 register struct sys_getdirentries_args /* { 1940 syscallarg(int) fd; 1941 syscallarg(char *) buf; 1942 syscallarg(u_int) count; 1943 syscallarg(long *) basep; 1944 } */ *uap = v; 1945 register struct vnode *vp; 1946 struct file *fp; 1947 struct uio auio; 1948 struct iovec aiov; 1949 long loff; 1950 int error, eofflag; 1951 1952 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1953 return (error); 1954 if ((fp->f_flag & FREAD) == 0) 1955 return (EBADF); 1956 vp = (struct vnode *)fp->f_data; 1957 unionread: 1958 if (vp->v_type != VDIR) 1959 return (EINVAL); 1960 aiov.iov_base = SCARG(uap, buf); 1961 aiov.iov_len = SCARG(uap, count); 1962 auio.uio_iov = &aiov; 1963 auio.uio_iovcnt = 1; 1964 auio.uio_rw = UIO_READ; 1965 auio.uio_segflg = UIO_USERSPACE; 1966 auio.uio_procp = p; 1967 auio.uio_resid = SCARG(uap, count); 1968 VOP_LOCK(vp); 1969 loff = auio.uio_offset = fp->f_offset; 1970 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, (u_long *)0, 0); 1971 fp->f_offset = auio.uio_offset; 1972 VOP_UNLOCK(vp); 1973 if (error) 1974 return (error); 1975 1976 #ifdef UNION 1977 { 1978 extern int (**union_vnodeop_p) __P((void *)); 1979 extern struct vnode *union_dircache __P((struct vnode *)); 1980 1981 if ((SCARG(uap, count) == auio.uio_resid) && 1982 (vp->v_op == union_vnodeop_p)) { 1983 struct vnode *lvp; 1984 1985 lvp = union_dircache(vp); 1986 if (lvp != NULLVP) { 1987 struct vattr va; 1988 1989 /* 1990 * If the directory is opaque, 1991 * then don't show lower entries 1992 */ 1993 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 1994 if (va.va_flags & OPAQUE) { 1995 vput(lvp); 1996 lvp = NULL; 1997 } 1998 } 1999 2000 if (lvp != NULLVP) { 2001 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 2002 VOP_UNLOCK(lvp); 2003 2004 if (error) { 2005 vrele(lvp); 2006 return (error); 2007 } 2008 fp->f_data = (caddr_t) lvp; 2009 fp->f_offset = 0; 2010 error = vn_close(vp, FREAD, fp->f_cred, p); 2011 if (error) 2012 return (error); 2013 vp = lvp; 2014 goto unionread; 2015 } 2016 } 2017 } 2018 #endif /* UNION */ 2019 2020 if ((SCARG(uap, count) == auio.uio_resid) && 2021 (vp->v_flag & VROOT) && 2022 (vp->v_mount->mnt_flag & MNT_UNION)) { 2023 struct vnode *tvp = vp; 2024 vp = vp->v_mount->mnt_vnodecovered; 2025 VREF(vp); 2026 fp->f_data = (caddr_t) vp; 2027 fp->f_offset = 0; 2028 vrele(tvp); 2029 goto unionread; 2030 } 2031 error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), 2032 sizeof(long)); 2033 *retval = SCARG(uap, count) - auio.uio_resid; 2034 return (error); 2035 } 2036 2037 /* 2038 * Set the mode mask for creation of filesystem nodes. 2039 */ 2040 int 2041 sys_umask(p, v, retval) 2042 struct proc *p; 2043 void *v; 2044 register_t *retval; 2045 { 2046 struct sys_umask_args /* { 2047 syscallarg(int) newmask; 2048 } */ *uap = v; 2049 register struct filedesc *fdp; 2050 2051 fdp = p->p_fd; 2052 *retval = fdp->fd_cmask; 2053 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2054 return (0); 2055 } 2056 2057 /* 2058 * Void all references to file by ripping underlying filesystem 2059 * away from vnode. 2060 */ 2061 /* ARGSUSED */ 2062 int 2063 sys_revoke(p, v, retval) 2064 struct proc *p; 2065 void *v; 2066 register_t *retval; 2067 { 2068 register struct sys_revoke_args /* { 2069 syscallarg(char *) path; 2070 } */ *uap = v; 2071 register struct vnode *vp; 2072 struct vattr vattr; 2073 int error; 2074 struct nameidata nd; 2075 2076 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2077 if ((error = namei(&nd)) != 0) 2078 return (error); 2079 vp = nd.ni_vp; 2080 if (vp->v_type != VCHR && vp->v_type != VBLK) { 2081 error = EINVAL; 2082 goto out; 2083 } 2084 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2085 goto out; 2086 if (p->p_ucred->cr_uid != vattr.va_uid && 2087 (error = suser(p->p_ucred, &p->p_acflag))) 2088 goto out; 2089 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2090 vgoneall(vp); 2091 out: 2092 vrele(vp); 2093 return (error); 2094 } 2095 2096 /* 2097 * Convert a user file descriptor to a kernel file entry. 2098 */ 2099 int 2100 getvnode(fdp, fd, fpp) 2101 struct filedesc *fdp; 2102 int fd; 2103 struct file **fpp; 2104 { 2105 struct vnode *vp; 2106 struct file *fp; 2107 2108 if ((u_int)fd >= fdp->fd_nfiles || 2109 (fp = fdp->fd_ofiles[fd]) == NULL) 2110 return (EBADF); 2111 if (fp->f_type != DTYPE_VNODE) 2112 return (EINVAL); 2113 vp = (struct vnode *)fp->f_data; 2114 if (vp->v_type == VBAD) 2115 return (EBADF); 2116 *fpp = fp; 2117 return (0); 2118 } 2119
Indexes created Sat Sep 27 14:09:57 GMT 2025