vfs_syscalls.c revision 1.58
1 /* $NetBSD: vfs_syscalls.c,v 1.58 1995/11/07 22:41:02 gwr Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/namei.h> 46 #include <sys/filedesc.h> 47 #include <sys/kernel.h> 48 #include <sys/file.h> 49 #include <sys/stat.h> 50 #include <sys/vnode.h> 51 #include <sys/mount.h> 52 #include <sys/proc.h> 53 #include <sys/uio.h> 54 #include <sys/malloc.h> 55 #include <sys/dirent.h> 56 57 #include <sys/syscallargs.h> 58 59 #include <vm/vm.h> 60 #include <sys/sysctl.h> 61 62 static int change_dir __P((struct nameidata *ndp, struct proc *p)); 63 64 /* 65 * Virtual File System System Calls 66 */ 67 68 /* 69 * Mount a file system. 70 */ 71 /* ARGSUSED */ 72 sys_mount(p, v, retval) 73 struct proc *p; 74 void *v; 75 register_t *retval; 76 { 77 register struct sys_mount_args /* { 78 syscallarg(char *) type; 79 syscallarg(char *) path; 80 syscallarg(int) flags; 81 syscallarg(caddr_t) data; 82 } */ *uap = v; 83 register struct vnode *vp; 84 register struct mount *mp; 85 int error, flag; 86 u_long fsindex; 87 char fstypename[MFSNAMELEN]; 88 struct vattr va; 89 struct nameidata nd; 90 91 /* 92 * Get vnode to be covered 93 */ 94 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 95 SCARG(uap, path), p); 96 if (error = namei(&nd)) 97 return (error); 98 vp = nd.ni_vp; 99 if (SCARG(uap, flags) & MNT_UPDATE) { 100 if ((vp->v_flag & VROOT) == 0) { 101 vput(vp); 102 return (EINVAL); 103 } 104 mp = vp->v_mount; 105 flag = mp->mnt_flag; 106 /* 107 * We only allow the filesystem to be reloaded if it 108 * is currently mounted read-only. 109 */ 110 if ((SCARG(uap, flags) & MNT_RELOAD) && 111 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 112 vput(vp); 113 return (EOPNOTSUPP); /* Needs translation */ 114 } 115 mp->mnt_flag |= 116 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 117 /* 118 * Only root, or the user that did the original mount is 119 * permitted to update it. 120 */ 121 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 122 (error = suser(p->p_ucred, &p->p_acflag))) { 123 vput(vp); 124 return (error); 125 } 126 /* 127 * Do not allow NFS export by non-root users. Silently 128 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 129 */ 130 if (p->p_ucred->cr_uid != 0) { 131 if (SCARG(uap, flags) & MNT_EXPORTED) { 132 vput(vp); 133 return (EPERM); 134 } 135 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 136 } 137 VOP_UNLOCK(vp); 138 goto update; 139 } 140 /* 141 * If the user is not root, ensure that they own the directory 142 * onto which we are attempting to mount. 143 */ 144 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) || 145 (va.va_uid != p->p_ucred->cr_uid && 146 (error = suser(p->p_ucred, &p->p_acflag)))) { 147 vput(vp); 148 return (error); 149 } 150 /* 151 * Do not allow NFS export by non-root users. Silently 152 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 153 */ 154 if (p->p_ucred->cr_uid != 0) { 155 if (SCARG(uap, flags) & MNT_EXPORTED) { 156 vput(vp); 157 return (EPERM); 158 } 159 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 160 } 161 if (error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) 162 return (error); 163 if (vp->v_type != VDIR) { 164 vput(vp); 165 return (ENOTDIR); 166 } 167 if (error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, 168 (size_t *)0)) { 169 #if defined(COMPAT_09) || defined(COMPAT_43) 170 /* 171 * Historically filesystem types were identified by number. 172 * If we get an integer for the filesystem type instead of a 173 * string, we check to see if it matches one of the historic 174 * filesystem types. 175 */ 176 fsindex = (u_long)SCARG(uap, type); 177 if (fsindex >= nvfssw || vfssw[fsindex] == NULL) { 178 vput(vp); 179 return (ENODEV); 180 } 181 strncpy(fstypename, vfssw[fsindex]->vfs_name, MFSNAMELEN); 182 #else 183 vput(vp); 184 return (error); 185 #endif 186 } 187 #ifdef COMPAT_10 188 /* Accept "ufs" as an alias for "ffs" */ 189 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) { 190 strncpy( fstypename, "ffs", MFSNAMELEN); 191 } 192 #endif 193 for (fsindex = 0; fsindex < nvfssw; fsindex++) 194 if (vfssw[fsindex] != NULL && 195 !strncmp(vfssw[fsindex]->vfs_name, fstypename, MFSNAMELEN)) 196 break; 197 if (fsindex >= nvfssw) { 198 vput(vp); 199 return (ENODEV); 200 } 201 if (vp->v_mountedhere != NULL) { 202 vput(vp); 203 return (EBUSY); 204 } 205 206 /* 207 * Allocate and initialize the file system. 208 */ 209 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 210 M_MOUNT, M_WAITOK); 211 bzero((char *)mp, (u_long)sizeof(struct mount)); 212 mp->mnt_op = vfssw[fsindex]; 213 if (error = vfs_lock(mp)) { 214 free((caddr_t)mp, M_MOUNT); 215 vput(vp); 216 return (error); 217 } 218 /* Do this early in case we block later. */ 219 vfssw[fsindex]->vfs_refcount++; 220 vp->v_mountedhere = mp; 221 mp->mnt_vnodecovered = vp; 222 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 223 update: 224 /* 225 * Set the mount level flags. 226 */ 227 if (SCARG(uap, flags) & MNT_RDONLY) 228 mp->mnt_flag |= MNT_RDONLY; 229 else if (mp->mnt_flag & MNT_RDONLY) 230 mp->mnt_flag |= MNT_WANTRDWR; 231 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 232 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC); 233 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 234 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC); 235 /* 236 * Mount the filesystem. 237 */ 238 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 239 if (mp->mnt_flag & MNT_UPDATE) { 240 vrele(vp); 241 if (mp->mnt_flag & MNT_WANTRDWR) 242 mp->mnt_flag &= ~MNT_RDONLY; 243 mp->mnt_flag &=~ 244 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 245 if (error) 246 mp->mnt_flag = flag; 247 return (error); 248 } 249 /* 250 * Put the new filesystem on the mount list after root. 251 */ 252 cache_purge(vp); 253 if (!error) { 254 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 255 checkdirs(vp); 256 VOP_UNLOCK(vp); 257 vfs_unlock(mp); 258 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 259 error = VFS_START(mp, 0, p); 260 } else { 261 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 262 vfssw[fsindex]->vfs_refcount--; 263 vfs_unlock(mp); 264 free((caddr_t)mp, M_MOUNT); 265 vput(vp); 266 } 267 return (error); 268 } 269 270 /* 271 * Scan all active processes to see if any of them have a current 272 * or root directory onto which the new filesystem has just been 273 * mounted. If so, replace them with the new mount point. 274 */ 275 checkdirs(olddp) 276 struct vnode *olddp; 277 { 278 struct filedesc *fdp; 279 struct vnode *newdp; 280 struct proc *p; 281 282 if (olddp->v_usecount == 1) 283 return; 284 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 285 panic("mount: lost mount"); 286 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 287 fdp = p->p_fd; 288 if (fdp->fd_cdir == olddp) { 289 vrele(fdp->fd_cdir); 290 VREF(newdp); 291 fdp->fd_cdir = newdp; 292 } 293 if (fdp->fd_rdir == olddp) { 294 vrele(fdp->fd_rdir); 295 VREF(newdp); 296 fdp->fd_rdir = newdp; 297 } 298 } 299 if (rootvnode == olddp) { 300 vrele(rootvnode); 301 VREF(newdp); 302 rootvnode = newdp; 303 } 304 vput(newdp); 305 } 306 307 /* 308 * Unmount a file system. 309 * 310 * Note: unmount takes a path to the vnode mounted on as argument, 311 * not special file (as before). 312 */ 313 /* ARGSUSED */ 314 sys_unmount(p, v, retval) 315 struct proc *p; 316 void *v; 317 register_t *retval; 318 { 319 register struct sys_unmount_args /* { 320 syscallarg(char *) path; 321 syscallarg(int) flags; 322 } */ *uap = v; 323 register struct vnode *vp; 324 struct mount *mp; 325 int error; 326 struct nameidata nd; 327 328 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 329 SCARG(uap, path), p); 330 if (error = namei(&nd)) 331 return (error); 332 vp = nd.ni_vp; 333 mp = vp->v_mount; 334 335 /* 336 * Only root, or the user that did the original mount is 337 * permitted to unmount this filesystem. 338 */ 339 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 340 (error = suser(p->p_ucred, &p->p_acflag))) { 341 vput(vp); 342 return (error); 343 } 344 345 /* 346 * Don't allow unmounting the root file system. 347 */ 348 if (mp->mnt_flag & MNT_ROOTFS) { 349 vput(vp); 350 return (EINVAL); 351 } 352 353 /* 354 * Must be the root of the filesystem 355 */ 356 if ((vp->v_flag & VROOT) == 0) { 357 vput(vp); 358 return (EINVAL); 359 } 360 vput(vp); 361 return (dounmount(mp, SCARG(uap, flags), p)); 362 } 363 364 /* 365 * Do the actual file system unmount. 366 */ 367 dounmount(mp, flags, p) 368 register struct mount *mp; 369 int flags; 370 struct proc *p; 371 { 372 struct vnode *coveredvp; 373 int error; 374 375 coveredvp = mp->mnt_vnodecovered; 376 if (vfs_busy(mp)) 377 return (EBUSY); 378 mp->mnt_flag |= MNT_UNMOUNT; 379 if (error = vfs_lock(mp)) 380 return (error); 381 382 mp->mnt_flag &=~ MNT_ASYNC; 383 vnode_pager_umount(mp); /* release cached vnodes */ 384 cache_purgevfs(mp); /* remove cache entries for this file sys */ 385 if ((error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0 || 386 (flags & MNT_FORCE)) 387 error = VFS_UNMOUNT(mp, flags, p); 388 mp->mnt_flag &= ~MNT_UNMOUNT; 389 vfs_unbusy(mp); 390 if (error) { 391 vfs_unlock(mp); 392 } else { 393 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 394 if (coveredvp != NULLVP) { 395 vrele(coveredvp); 396 coveredvp->v_mountedhere = (struct mount *)0; 397 } 398 mp->mnt_op->vfs_refcount--; 399 vfs_unlock(mp); 400 if (mp->mnt_vnodelist.lh_first != NULL) 401 panic("unmount: dangling vnode"); 402 free((caddr_t)mp, M_MOUNT); 403 } 404 return (error); 405 } 406 407 /* 408 * Sync each mounted filesystem. 409 */ 410 #ifdef DEBUG 411 int syncprt = 0; 412 struct ctldebug debug0 = { "syncprt", &syncprt }; 413 #endif 414 415 /* ARGSUSED */ 416 sys_sync(p, v, retval) 417 struct proc *p; 418 void *v; 419 register_t *retval; 420 { 421 register struct mount *mp, *nmp; 422 int asyncflag; 423 424 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 425 /* 426 * Get the next pointer in case we hang on vfs_busy 427 * while we are being unmounted. 428 */ 429 nmp = mp->mnt_list.cqe_next; 430 /* 431 * The lock check below is to avoid races with mount 432 * and unmount. 433 */ 434 if ((mp->mnt_flag & (MNT_MLOCK|MNT_RDONLY|MNT_MPBUSY)) == 0 && 435 !vfs_busy(mp)) { 436 asyncflag = mp->mnt_flag & MNT_ASYNC; 437 mp->mnt_flag &= ~MNT_ASYNC; 438 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 439 if (asyncflag) 440 mp->mnt_flag |= MNT_ASYNC; 441 /* 442 * Get the next pointer again, as the next filesystem 443 * might have been unmounted while we were sync'ing. 444 */ 445 nmp = mp->mnt_list.cqe_next; 446 vfs_unbusy(mp); 447 } 448 } 449 #ifdef DEBUG 450 if (syncprt) 451 vfs_bufstats(); 452 #endif /* DEBUG */ 453 return (0); 454 } 455 456 /* 457 * Change filesystem quotas. 458 */ 459 /* ARGSUSED */ 460 sys_quotactl(p, v, retval) 461 struct proc *p; 462 void *v; 463 register_t *retval; 464 { 465 register struct sys_quotactl_args /* { 466 syscallarg(char *) path; 467 syscallarg(int) cmd; 468 syscallarg(int) uid; 469 syscallarg(caddr_t) arg; 470 } */ *uap = v; 471 register struct mount *mp; 472 int error; 473 struct nameidata nd; 474 475 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 476 if (error = namei(&nd)) 477 return (error); 478 mp = nd.ni_vp->v_mount; 479 vrele(nd.ni_vp); 480 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 481 SCARG(uap, arg), p)); 482 } 483 484 /* 485 * Get filesystem statistics. 486 */ 487 /* ARGSUSED */ 488 sys_statfs(p, v, retval) 489 struct proc *p; 490 void *v; 491 register_t *retval; 492 { 493 register struct sys_statfs_args /* { 494 syscallarg(char *) path; 495 syscallarg(struct statfs *) buf; 496 } */ *uap = v; 497 register struct mount *mp; 498 register struct statfs *sp; 499 int error; 500 struct nameidata nd; 501 502 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 503 if (error = namei(&nd)) 504 return (error); 505 mp = nd.ni_vp->v_mount; 506 sp = &mp->mnt_stat; 507 vrele(nd.ni_vp); 508 if (error = VFS_STATFS(mp, sp, p)) 509 return (error); 510 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 511 return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); 512 } 513 514 /* 515 * Get filesystem statistics. 516 */ 517 /* ARGSUSED */ 518 sys_fstatfs(p, v, retval) 519 struct proc *p; 520 void *v; 521 register_t *retval; 522 { 523 register struct sys_fstatfs_args /* { 524 syscallarg(int) fd; 525 syscallarg(struct statfs *) buf; 526 } */ *uap = v; 527 struct file *fp; 528 struct mount *mp; 529 register struct statfs *sp; 530 int error; 531 532 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 533 return (error); 534 mp = ((struct vnode *)fp->f_data)->v_mount; 535 sp = &mp->mnt_stat; 536 if (error = VFS_STATFS(mp, sp, p)) 537 return (error); 538 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 539 return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); 540 } 541 542 /* 543 * Get statistics on all filesystems. 544 */ 545 sys_getfsstat(p, v, retval) 546 struct proc *p; 547 void *v; 548 register_t *retval; 549 { 550 register struct sys_getfsstat_args /* { 551 syscallarg(struct statfs *) buf; 552 syscallarg(long) bufsize; 553 syscallarg(int) flags; 554 } */ *uap = v; 555 register struct mount *mp, *nmp; 556 register struct statfs *sp; 557 caddr_t sfsp; 558 long count, maxcount, error; 559 560 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 561 sfsp = (caddr_t)SCARG(uap, buf); 562 for (count = 0, 563 mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 564 nmp = mp->mnt_list.cqe_next; 565 if (sfsp && count < maxcount && 566 ((mp->mnt_flag & MNT_MLOCK) == 0)) { 567 sp = &mp->mnt_stat; 568 /* 569 * If MNT_NOWAIT is specified, do not refresh the 570 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 571 */ 572 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 573 (SCARG(uap, flags) & MNT_WAIT)) && 574 (error = VFS_STATFS(mp, sp, p))) 575 continue; 576 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 577 if (error = copyout((caddr_t)sp, sfsp, sizeof(*sp))) 578 return (error); 579 sfsp += sizeof(*sp); 580 } 581 count++; 582 } 583 if (sfsp && count > maxcount) 584 *retval = maxcount; 585 else 586 *retval = count; 587 return (0); 588 } 589 590 /* 591 * Change current working directory to a given file descriptor. 592 */ 593 /* ARGSUSED */ 594 sys_fchdir(p, v, retval) 595 struct proc *p; 596 void *v; 597 register_t *retval; 598 { 599 struct sys_fchdir_args /* { 600 syscallarg(int) fd; 601 } */ *uap = v; 602 register struct filedesc *fdp = p->p_fd; 603 struct vnode *vp, *tdp; 604 struct mount *mp; 605 struct file *fp; 606 int error; 607 608 if (error = getvnode(fdp, SCARG(uap, fd), &fp)) 609 return (error); 610 vp = (struct vnode *)fp->f_data; 611 VREF(vp); 612 VOP_LOCK(vp); 613 if (vp->v_type != VDIR) 614 error = ENOTDIR; 615 else 616 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 617 while (!error && (mp = vp->v_mountedhere) != NULL) { 618 if (mp->mnt_flag & MNT_MLOCK) { 619 mp->mnt_flag |= MNT_MWAIT; 620 sleep((caddr_t)mp, PVFS); 621 continue; 622 } 623 if (error = VFS_ROOT(mp, &tdp)) 624 break; 625 vput(vp); 626 vp = tdp; 627 } 628 VOP_UNLOCK(vp); 629 if (error) { 630 vrele(vp); 631 return (error); 632 } 633 vrele(fdp->fd_cdir); 634 fdp->fd_cdir = vp; 635 return (0); 636 } 637 638 /* 639 * Change current working directory (``.''). 640 */ 641 /* ARGSUSED */ 642 sys_chdir(p, v, retval) 643 struct proc *p; 644 void *v; 645 register_t *retval; 646 { 647 struct sys_chdir_args /* { 648 syscallarg(char *) path; 649 } */ *uap = v; 650 register struct filedesc *fdp = p->p_fd; 651 int error; 652 struct nameidata nd; 653 654 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 655 SCARG(uap, path), p); 656 if (error = change_dir(&nd, p)) 657 return (error); 658 vrele(fdp->fd_cdir); 659 fdp->fd_cdir = nd.ni_vp; 660 return (0); 661 } 662 663 /* 664 * Change notion of root (``/'') directory. 665 */ 666 /* ARGSUSED */ 667 sys_chroot(p, v, retval) 668 struct proc *p; 669 void *v; 670 register_t *retval; 671 { 672 struct sys_chroot_args /* { 673 syscallarg(char *) path; 674 } */ *uap = v; 675 register struct filedesc *fdp = p->p_fd; 676 int error; 677 struct nameidata nd; 678 679 if (error = suser(p->p_ucred, &p->p_acflag)) 680 return (error); 681 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 682 SCARG(uap, path), p); 683 if (error = change_dir(&nd, p)) 684 return (error); 685 if (fdp->fd_rdir != NULL) 686 vrele(fdp->fd_rdir); 687 fdp->fd_rdir = nd.ni_vp; 688 return (0); 689 } 690 691 /* 692 * Common routine for chroot and chdir. 693 */ 694 static int 695 change_dir(ndp, p) 696 register struct nameidata *ndp; 697 struct proc *p; 698 { 699 struct vnode *vp; 700 int error; 701 702 if (error = namei(ndp)) 703 return (error); 704 vp = ndp->ni_vp; 705 if (vp->v_type != VDIR) 706 error = ENOTDIR; 707 else 708 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 709 VOP_UNLOCK(vp); 710 if (error) 711 vrele(vp); 712 return (error); 713 } 714 715 /* 716 * Check permissions, allocate an open file structure, 717 * and call the device open routine if any. 718 */ 719 sys_open(p, v, retval) 720 struct proc *p; 721 void *v; 722 register_t *retval; 723 { 724 register struct sys_open_args /* { 725 syscallarg(char *) path; 726 syscallarg(int) flags; 727 syscallarg(int) mode; 728 } */ *uap = v; 729 register struct filedesc *fdp = p->p_fd; 730 register struct file *fp; 731 register struct vnode *vp; 732 int flags, cmode; 733 struct file *nfp; 734 int type, indx, error; 735 struct flock lf; 736 struct nameidata nd; 737 extern struct fileops vnops; 738 739 if (error = falloc(p, &nfp, &indx)) 740 return (error); 741 fp = nfp; 742 flags = FFLAGS(SCARG(uap, flags)); 743 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 744 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 745 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 746 if (error = vn_open(&nd, flags, cmode)) { 747 ffree(fp); 748 if ((error == ENODEV || error == ENXIO) && 749 p->p_dupfd >= 0 && /* XXX from fdopen */ 750 (error = 751 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 752 *retval = indx; 753 return (0); 754 } 755 if (error == ERESTART) 756 error = EINTR; 757 fdp->fd_ofiles[indx] = NULL; 758 return (error); 759 } 760 p->p_dupfd = 0; 761 vp = nd.ni_vp; 762 fp->f_flag = flags & FMASK; 763 fp->f_type = DTYPE_VNODE; 764 fp->f_ops = &vnops; 765 fp->f_data = (caddr_t)vp; 766 if (flags & (O_EXLOCK | O_SHLOCK)) { 767 lf.l_whence = SEEK_SET; 768 lf.l_start = 0; 769 lf.l_len = 0; 770 if (flags & O_EXLOCK) 771 lf.l_type = F_WRLCK; 772 else 773 lf.l_type = F_RDLCK; 774 type = F_FLOCK; 775 if ((flags & FNONBLOCK) == 0) 776 type |= F_WAIT; 777 VOP_UNLOCK(vp); 778 if (error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) { 779 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 780 ffree(fp); 781 fdp->fd_ofiles[indx] = NULL; 782 return (error); 783 } 784 VOP_LOCK(vp); 785 fp->f_flag |= FHASLOCK; 786 } 787 VOP_UNLOCK(vp); 788 *retval = indx; 789 return (0); 790 } 791 792 /* 793 * Create a special file. 794 */ 795 /* ARGSUSED */ 796 sys_mknod(p, v, retval) 797 struct proc *p; 798 void *v; 799 register_t *retval; 800 { 801 register struct sys_mknod_args /* { 802 syscallarg(char *) path; 803 syscallarg(int) mode; 804 syscallarg(int) dev; 805 } */ *uap = v; 806 register struct vnode *vp; 807 struct vattr vattr; 808 int error; 809 int whiteout; 810 struct nameidata nd; 811 812 if (error = suser(p->p_ucred, &p->p_acflag)) 813 return (error); 814 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 815 if (error = namei(&nd)) 816 return (error); 817 vp = nd.ni_vp; 818 if (vp != NULL) 819 error = EEXIST; 820 else { 821 VATTR_NULL(&vattr); 822 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 823 vattr.va_rdev = SCARG(uap, dev); 824 whiteout = 0; 825 826 switch (SCARG(uap, mode) & S_IFMT) { 827 case S_IFMT: /* used by badsect to flag bad sectors */ 828 vattr.va_type = VBAD; 829 break; 830 case S_IFCHR: 831 vattr.va_type = VCHR; 832 break; 833 case S_IFBLK: 834 vattr.va_type = VBLK; 835 break; 836 case S_IFWHT: 837 whiteout = 1; 838 break; 839 default: 840 error = EINVAL; 841 break; 842 } 843 } 844 if (!error) { 845 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 846 if (whiteout) { 847 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 848 if (error) 849 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 850 vput(nd.ni_dvp); 851 } else { 852 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 853 &nd.ni_cnd, &vattr); 854 } 855 } else { 856 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 857 if (nd.ni_dvp == vp) 858 vrele(nd.ni_dvp); 859 else 860 vput(nd.ni_dvp); 861 if (vp) 862 vrele(vp); 863 } 864 return (error); 865 } 866 867 /* 868 * Create a named pipe. 869 */ 870 /* ARGSUSED */ 871 sys_mkfifo(p, v, retval) 872 struct proc *p; 873 void *v; 874 register_t *retval; 875 { 876 register struct sys_mkfifo_args /* { 877 syscallarg(char *) path; 878 syscallarg(int) mode; 879 } */ *uap = v; 880 struct vattr vattr; 881 int error; 882 struct nameidata nd; 883 884 #ifndef FIFO 885 return (EOPNOTSUPP); 886 #else 887 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 888 if (error = namei(&nd)) 889 return (error); 890 if (nd.ni_vp != NULL) { 891 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 892 if (nd.ni_dvp == nd.ni_vp) 893 vrele(nd.ni_dvp); 894 else 895 vput(nd.ni_dvp); 896 vrele(nd.ni_vp); 897 return (EEXIST); 898 } 899 VATTR_NULL(&vattr); 900 vattr.va_type = VFIFO; 901 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 902 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 903 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 904 #endif /* FIFO */ 905 } 906 907 /* 908 * Make a hard file link. 909 */ 910 /* ARGSUSED */ 911 sys_link(p, v, retval) 912 struct proc *p; 913 void *v; 914 register_t *retval; 915 { 916 register struct sys_link_args /* { 917 syscallarg(char *) path; 918 syscallarg(char *) link; 919 } */ *uap = v; 920 register struct vnode *vp; 921 struct nameidata nd; 922 int error; 923 924 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 925 if (error = namei(&nd)) 926 return (error); 927 vp = nd.ni_vp; 928 if (vp->v_type != VDIR || 929 (error = suser(p->p_ucred, &p->p_acflag)) == 0) { 930 nd.ni_cnd.cn_nameiop = CREATE; 931 nd.ni_cnd.cn_flags = LOCKPARENT; 932 nd.ni_dirp = SCARG(uap, link); 933 if ((error = namei(&nd)) == 0) { 934 if (nd.ni_vp != NULL) 935 error = EEXIST; 936 if (!error) { 937 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, 938 LEASE_WRITE); 939 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 940 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 941 } else { 942 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 943 if (nd.ni_dvp == nd.ni_vp) 944 vrele(nd.ni_dvp); 945 else 946 vput(nd.ni_dvp); 947 if (nd.ni_vp) 948 vrele(nd.ni_vp); 949 } 950 } 951 } 952 vrele(vp); 953 return (error); 954 } 955 956 /* 957 * Make a symbolic link. 958 */ 959 /* ARGSUSED */ 960 sys_symlink(p, v, retval) 961 struct proc *p; 962 void *v; 963 register_t *retval; 964 { 965 register struct sys_symlink_args /* { 966 syscallarg(char *) path; 967 syscallarg(char *) link; 968 } */ *uap = v; 969 struct vattr vattr; 970 char *path; 971 int error; 972 struct nameidata nd; 973 974 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 975 if (error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, (size_t *)0)) 976 goto out; 977 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 978 if (error = namei(&nd)) 979 goto out; 980 if (nd.ni_vp) { 981 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 982 if (nd.ni_dvp == nd.ni_vp) 983 vrele(nd.ni_dvp); 984 else 985 vput(nd.ni_dvp); 986 vrele(nd.ni_vp); 987 error = EEXIST; 988 goto out; 989 } 990 VATTR_NULL(&vattr); 991 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 992 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 993 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 994 out: 995 FREE(path, M_NAMEI); 996 return (error); 997 } 998 999 /* 1000 * Delete a whiteout from the filesystem. 1001 */ 1002 /* ARGSUSED */ 1003 sys_undelete(p, v, retval) 1004 struct proc *p; 1005 void *v; 1006 register_t *retval; 1007 { 1008 register struct sys_undelete_args /* { 1009 syscallarg(char *) path; 1010 } */ *uap = v; 1011 int error; 1012 struct nameidata nd; 1013 1014 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1015 SCARG(uap, path), p); 1016 error = namei(&nd); 1017 if (error) 1018 return (error); 1019 1020 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1021 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1022 if (nd.ni_dvp == nd.ni_vp) 1023 vrele(nd.ni_dvp); 1024 else 1025 vput(nd.ni_dvp); 1026 if (nd.ni_vp) 1027 vrele(nd.ni_vp); 1028 return (EEXIST); 1029 } 1030 1031 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1032 if (error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) 1033 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1034 vput(nd.ni_dvp); 1035 return (error); 1036 } 1037 1038 /* 1039 * Delete a name from the filesystem. 1040 */ 1041 /* ARGSUSED */ 1042 sys_unlink(p, v, retval) 1043 struct proc *p; 1044 void *v; 1045 register_t *retval; 1046 { 1047 struct sys_unlink_args /* { 1048 syscallarg(char *) path; 1049 } */ *uap = v; 1050 register struct vnode *vp; 1051 int error; 1052 struct nameidata nd; 1053 1054 NDINIT(&nd, DELETE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1055 if (error = namei(&nd)) 1056 return (error); 1057 vp = nd.ni_vp; 1058 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1059 VOP_LOCK(vp); 1060 1061 if (vp->v_type != VDIR || 1062 (error = suser(p->p_ucred, &p->p_acflag)) == 0) { 1063 /* 1064 * The root of a mounted filesystem cannot be deleted. 1065 */ 1066 if (vp->v_flag & VROOT) 1067 error = EBUSY; 1068 else 1069 (void)vnode_pager_uncache(vp); 1070 } 1071 1072 if (!error) { 1073 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1074 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1075 } else { 1076 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1077 if (nd.ni_dvp == vp) 1078 vrele(nd.ni_dvp); 1079 else 1080 vput(nd.ni_dvp); 1081 if (vp != NULLVP) 1082 vput(vp); 1083 } 1084 return (error); 1085 } 1086 1087 /* 1088 * Reposition read/write file offset. 1089 */ 1090 sys_lseek(p, v, retval) 1091 struct proc *p; 1092 void *v; 1093 register_t *retval; 1094 { 1095 register struct sys_lseek_args /* { 1096 syscallarg(int) fd; 1097 syscallarg(int) pad; 1098 syscallarg(off_t) offset; 1099 syscallarg(int) whence; 1100 } */ *uap = v; 1101 struct ucred *cred = p->p_ucred; 1102 register struct filedesc *fdp = p->p_fd; 1103 register struct file *fp; 1104 struct vattr vattr; 1105 int error; 1106 1107 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1108 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1109 return (EBADF); 1110 if (fp->f_type != DTYPE_VNODE) 1111 return (ESPIPE); 1112 switch (SCARG(uap, whence)) { 1113 case L_INCR: 1114 fp->f_offset += SCARG(uap, offset); 1115 break; 1116 case L_XTND: 1117 if (error = 1118 VOP_GETATTR((struct vnode *)fp->f_data, &vattr, cred, p)) 1119 return (error); 1120 fp->f_offset = SCARG(uap, offset) + vattr.va_size; 1121 break; 1122 case L_SET: 1123 fp->f_offset = SCARG(uap, offset); 1124 break; 1125 default: 1126 return (EINVAL); 1127 } 1128 *(off_t *)retval = fp->f_offset; 1129 return (0); 1130 } 1131 1132 /* 1133 * Check access permissions. 1134 */ 1135 sys_access(p, v, retval) 1136 struct proc *p; 1137 void *v; 1138 register_t *retval; 1139 { 1140 register struct sys_access_args /* { 1141 syscallarg(char *) path; 1142 syscallarg(int) flags; 1143 } */ *uap = v; 1144 register struct ucred *cred = p->p_ucred; 1145 register struct vnode *vp; 1146 int error, flags, t_gid, t_uid; 1147 struct nameidata nd; 1148 1149 t_uid = cred->cr_uid; 1150 t_gid = cred->cr_gid; 1151 cred->cr_uid = p->p_cred->p_ruid; 1152 cred->cr_gid = p->p_cred->p_rgid; 1153 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1154 SCARG(uap, path), p); 1155 if (error = namei(&nd)) 1156 goto out1; 1157 vp = nd.ni_vp; 1158 1159 /* Flags == 0 means only check for existence. */ 1160 if (SCARG(uap, flags)) { 1161 flags = 0; 1162 if (SCARG(uap, flags) & R_OK) 1163 flags |= VREAD; 1164 if (SCARG(uap, flags) & W_OK) 1165 flags |= VWRITE; 1166 if (SCARG(uap, flags) & X_OK) 1167 flags |= VEXEC; 1168 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1169 error = VOP_ACCESS(vp, flags, cred, p); 1170 } 1171 vput(vp); 1172 out1: 1173 cred->cr_uid = t_uid; 1174 cred->cr_gid = t_gid; 1175 return (error); 1176 } 1177 1178 /* 1179 * Get file status; this version follows links. 1180 */ 1181 /* ARGSUSED */ 1182 sys_stat(p, v, retval) 1183 struct proc *p; 1184 void *v; 1185 register_t *retval; 1186 { 1187 register struct sys_stat_args /* { 1188 syscallarg(char *) path; 1189 syscallarg(struct stat *) ub; 1190 } */ *uap = v; 1191 struct stat sb; 1192 int error; 1193 struct nameidata nd; 1194 1195 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1196 SCARG(uap, path), p); 1197 if (error = namei(&nd)) 1198 return (error); 1199 error = vn_stat(nd.ni_vp, &sb, p); 1200 vput(nd.ni_vp); 1201 if (error) 1202 return (error); 1203 error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); 1204 return (error); 1205 } 1206 1207 /* 1208 * Get file status; this version does not follow links. 1209 */ 1210 /* ARGSUSED */ 1211 sys_lstat(p, v, retval) 1212 struct proc *p; 1213 void *v; 1214 register_t *retval; 1215 { 1216 register struct sys_lstat_args /* { 1217 syscallarg(char *) path; 1218 syscallarg(struct stat *) ub; 1219 } */ *uap = v; 1220 int error; 1221 struct vnode *vp, *dvp; 1222 struct stat sb, sb1; 1223 struct nameidata nd; 1224 1225 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | LOCKPARENT, UIO_USERSPACE, 1226 SCARG(uap, path), p); 1227 if (error = namei(&nd)) 1228 return (error); 1229 /* 1230 * For symbolic links, always return the attributes of its 1231 * containing directory, except for mode, size, and links. 1232 */ 1233 vp = nd.ni_vp; 1234 dvp = nd.ni_dvp; 1235 if (vp->v_type != VLNK) { 1236 if (dvp == vp) 1237 vrele(dvp); 1238 else 1239 vput(dvp); 1240 error = vn_stat(vp, &sb, p); 1241 vput(vp); 1242 if (error) 1243 return (error); 1244 } else { 1245 error = vn_stat(dvp, &sb, p); 1246 vput(dvp); 1247 if (error) { 1248 vput(vp); 1249 return (error); 1250 } 1251 error = vn_stat(vp, &sb1, p); 1252 vput(vp); 1253 if (error) 1254 return (error); 1255 sb.st_mode &= ~S_IFDIR; 1256 sb.st_mode |= S_IFLNK; 1257 sb.st_nlink = sb1.st_nlink; 1258 sb.st_size = sb1.st_size; 1259 sb.st_blocks = sb1.st_blocks; 1260 } 1261 error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); 1262 return (error); 1263 } 1264 1265 /* 1266 * Get configurable pathname variables. 1267 */ 1268 /* ARGSUSED */ 1269 sys_pathconf(p, v, retval) 1270 struct proc *p; 1271 void *v; 1272 register_t *retval; 1273 { 1274 register struct sys_pathconf_args /* { 1275 syscallarg(char *) path; 1276 syscallarg(int) name; 1277 } */ *uap = v; 1278 int error; 1279 struct nameidata nd; 1280 1281 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1282 SCARG(uap, path), p); 1283 if (error = namei(&nd)) 1284 return (error); 1285 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1286 vput(nd.ni_vp); 1287 return (error); 1288 } 1289 1290 /* 1291 * Return target name of a symbolic link. 1292 */ 1293 /* ARGSUSED */ 1294 sys_readlink(p, v, retval) 1295 struct proc *p; 1296 void *v; 1297 register_t *retval; 1298 { 1299 register struct sys_readlink_args /* { 1300 syscallarg(char *) path; 1301 syscallarg(char *) buf; 1302 syscallarg(int) count; 1303 } */ *uap = v; 1304 register struct vnode *vp; 1305 struct iovec aiov; 1306 struct uio auio; 1307 int error; 1308 struct nameidata nd; 1309 1310 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1311 SCARG(uap, path), p); 1312 if (error = namei(&nd)) 1313 return (error); 1314 vp = nd.ni_vp; 1315 if (vp->v_type != VLNK) 1316 error = EINVAL; 1317 else { 1318 aiov.iov_base = SCARG(uap, buf); 1319 aiov.iov_len = SCARG(uap, count); 1320 auio.uio_iov = &aiov; 1321 auio.uio_iovcnt = 1; 1322 auio.uio_offset = 0; 1323 auio.uio_rw = UIO_READ; 1324 auio.uio_segflg = UIO_USERSPACE; 1325 auio.uio_procp = p; 1326 auio.uio_resid = SCARG(uap, count); 1327 error = VOP_READLINK(vp, &auio, p->p_ucred); 1328 } 1329 vput(vp); 1330 *retval = SCARG(uap, count) - auio.uio_resid; 1331 return (error); 1332 } 1333 1334 /* 1335 * Change flags of a file given a path name. 1336 */ 1337 /* ARGSUSED */ 1338 sys_chflags(p, v, retval) 1339 struct proc *p; 1340 void *v; 1341 register_t *retval; 1342 { 1343 register struct sys_chflags_args /* { 1344 syscallarg(char *) path; 1345 syscallarg(int) flags; 1346 } */ *uap = v; 1347 register struct vnode *vp; 1348 struct vattr vattr; 1349 int error; 1350 struct nameidata nd; 1351 1352 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1353 if (error = namei(&nd)) 1354 return (error); 1355 vp = nd.ni_vp; 1356 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1357 VOP_LOCK(vp); 1358 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1359 error = EROFS; 1360 else { 1361 VATTR_NULL(&vattr); 1362 vattr.va_flags = SCARG(uap, flags); 1363 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1364 } 1365 vput(vp); 1366 return (error); 1367 } 1368 1369 /* 1370 * Change flags of a file given a file descriptor. 1371 */ 1372 /* ARGSUSED */ 1373 sys_fchflags(p, v, retval) 1374 struct proc *p; 1375 void *v; 1376 register_t *retval; 1377 { 1378 register struct sys_fchflags_args /* { 1379 syscallarg(int) fd; 1380 syscallarg(int) flags; 1381 } */ *uap = v; 1382 struct vattr vattr; 1383 struct vnode *vp; 1384 struct file *fp; 1385 int error; 1386 1387 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1388 return (error); 1389 vp = (struct vnode *)fp->f_data; 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 VOP_UNLOCK(vp); 1400 return (error); 1401 } 1402 1403 /* 1404 * Change mode of a file given path name. 1405 */ 1406 /* ARGSUSED */ 1407 sys_chmod(p, v, retval) 1408 struct proc *p; 1409 void *v; 1410 register_t *retval; 1411 { 1412 register struct sys_chmod_args /* { 1413 syscallarg(char *) path; 1414 syscallarg(int) mode; 1415 } */ *uap = v; 1416 register struct vnode *vp; 1417 struct vattr vattr; 1418 int error; 1419 struct nameidata nd; 1420 1421 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1422 if (error = namei(&nd)) 1423 return (error); 1424 vp = nd.ni_vp; 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_mode = SCARG(uap, mode) & ALLPERMS; 1432 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1433 } 1434 vput(vp); 1435 return (error); 1436 } 1437 1438 /* 1439 * Change mode of a file given a file descriptor. 1440 */ 1441 /* ARGSUSED */ 1442 sys_fchmod(p, v, retval) 1443 struct proc *p; 1444 void *v; 1445 register_t *retval; 1446 { 1447 register struct sys_fchmod_args /* { 1448 syscallarg(int) fd; 1449 syscallarg(int) mode; 1450 } */ *uap = v; 1451 struct vattr vattr; 1452 struct vnode *vp; 1453 struct file *fp; 1454 int error; 1455 1456 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1457 return (error); 1458 vp = (struct vnode *)fp->f_data; 1459 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1460 VOP_LOCK(vp); 1461 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1462 error = EROFS; 1463 else { 1464 VATTR_NULL(&vattr); 1465 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1466 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1467 } 1468 VOP_UNLOCK(vp); 1469 return (error); 1470 } 1471 1472 /* 1473 * Set ownership given a path name. 1474 */ 1475 /* ARGSUSED */ 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)) 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 sys_fchown(p, v, retval) 1514 struct proc *p; 1515 void *v; 1516 register_t *retval; 1517 { 1518 register struct sys_fchown_args /* { 1519 syscallarg(int) fd; 1520 syscallarg(int) uid; 1521 syscallarg(int) gid; 1522 } */ *uap = v; 1523 struct vattr vattr; 1524 struct vnode *vp; 1525 struct file *fp; 1526 int error; 1527 1528 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1529 return (error); 1530 vp = (struct vnode *)fp->f_data; 1531 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1532 VOP_LOCK(vp); 1533 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1534 error = EROFS; 1535 else { 1536 VATTR_NULL(&vattr); 1537 vattr.va_uid = SCARG(uap, uid); 1538 vattr.va_gid = SCARG(uap, gid); 1539 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1540 } 1541 VOP_UNLOCK(vp); 1542 return (error); 1543 } 1544 1545 /* 1546 * Set the access and modification times of a file. 1547 */ 1548 /* ARGSUSED */ 1549 sys_utimes(p, v, retval) 1550 struct proc *p; 1551 void *v; 1552 register_t *retval; 1553 { 1554 register struct sys_utimes_args /* { 1555 syscallarg(char *) path; 1556 syscallarg(struct timeval *) tptr; 1557 } */ *uap = v; 1558 register struct vnode *vp; 1559 struct timeval tv[2]; 1560 struct vattr vattr; 1561 int error; 1562 struct nameidata nd; 1563 1564 VATTR_NULL(&vattr); 1565 if (SCARG(uap, tptr) == NULL) { 1566 microtime(&tv[0]); 1567 tv[1] = tv[0]; 1568 vattr.va_vaflags |= VA_UTIMES_NULL; 1569 } else if (error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv, 1570 sizeof (tv))) 1571 return (error); 1572 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1573 if (error = namei(&nd)) 1574 return (error); 1575 vp = nd.ni_vp; 1576 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1577 VOP_LOCK(vp); 1578 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1579 error = EROFS; 1580 else { 1581 vattr.va_atime.ts_sec = tv[0].tv_sec; 1582 vattr.va_atime.ts_nsec = tv[0].tv_usec * 1000; 1583 vattr.va_mtime.ts_sec = tv[1].tv_sec; 1584 vattr.va_mtime.ts_nsec = tv[1].tv_usec * 1000; 1585 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1586 } 1587 vput(vp); 1588 return (error); 1589 } 1590 1591 /* 1592 * Truncate a file given its path name. 1593 */ 1594 /* ARGSUSED */ 1595 sys_truncate(p, v, retval) 1596 struct proc *p; 1597 void *v; 1598 register_t *retval; 1599 { 1600 register struct sys_truncate_args /* { 1601 syscallarg(char *) path; 1602 syscallarg(int) pad; 1603 syscallarg(off_t) length; 1604 } */ *uap = v; 1605 register struct vnode *vp; 1606 struct vattr vattr; 1607 int error; 1608 struct nameidata nd; 1609 1610 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1611 if (error = namei(&nd)) 1612 return (error); 1613 vp = nd.ni_vp; 1614 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1615 VOP_LOCK(vp); 1616 if (vp->v_type == VDIR) 1617 error = EISDIR; 1618 else if ((error = vn_writechk(vp)) == 0 && 1619 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1620 VATTR_NULL(&vattr); 1621 vattr.va_size = SCARG(uap, length); 1622 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1623 } 1624 vput(vp); 1625 return (error); 1626 } 1627 1628 /* 1629 * Truncate a file given a file descriptor. 1630 */ 1631 /* ARGSUSED */ 1632 sys_ftruncate(p, v, retval) 1633 struct proc *p; 1634 void *v; 1635 register_t *retval; 1636 { 1637 register struct sys_ftruncate_args /* { 1638 syscallarg(int) fd; 1639 syscallarg(int) pad; 1640 syscallarg(off_t) length; 1641 } */ *uap = v; 1642 struct vattr vattr; 1643 struct vnode *vp; 1644 struct file *fp; 1645 int error; 1646 1647 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1648 return (error); 1649 if ((fp->f_flag & FWRITE) == 0) 1650 return (EINVAL); 1651 vp = (struct vnode *)fp->f_data; 1652 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1653 VOP_LOCK(vp); 1654 if (vp->v_type == VDIR) 1655 error = EISDIR; 1656 else if ((error = vn_writechk(vp)) == 0) { 1657 VATTR_NULL(&vattr); 1658 vattr.va_size = SCARG(uap, length); 1659 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1660 } 1661 VOP_UNLOCK(vp); 1662 return (error); 1663 } 1664 1665 /* 1666 * Sync an open file. 1667 */ 1668 /* ARGSUSED */ 1669 sys_fsync(p, v, retval) 1670 struct proc *p; 1671 void *v; 1672 register_t *retval; 1673 { 1674 struct sys_fsync_args /* { 1675 syscallarg(int) fd; 1676 } */ *uap = v; 1677 register struct vnode *vp; 1678 struct file *fp; 1679 int error; 1680 1681 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1682 return (error); 1683 vp = (struct vnode *)fp->f_data; 1684 VOP_LOCK(vp); 1685 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p); 1686 VOP_UNLOCK(vp); 1687 return (error); 1688 } 1689 1690 /* 1691 * Rename files. Source and destination must either both be directories, 1692 * or both not be directories. If target is a directory, it must be empty. 1693 */ 1694 /* ARGSUSED */ 1695 sys_rename(p, v, retval) 1696 struct proc *p; 1697 void *v; 1698 register_t *retval; 1699 { 1700 register struct sys_rename_args /* { 1701 syscallarg(char *) from; 1702 syscallarg(char *) to; 1703 } */ *uap = v; 1704 register struct vnode *tvp, *fvp, *tdvp; 1705 struct nameidata fromnd, tond; 1706 int error; 1707 1708 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 1709 SCARG(uap, from), p); 1710 if (error = namei(&fromnd)) 1711 return (error); 1712 fvp = fromnd.ni_vp; 1713 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 1714 UIO_USERSPACE, SCARG(uap, to), p); 1715 if (error = namei(&tond)) { 1716 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1717 vrele(fromnd.ni_dvp); 1718 vrele(fvp); 1719 goto out1; 1720 } 1721 tdvp = tond.ni_dvp; 1722 tvp = tond.ni_vp; 1723 if (tvp != NULL) { 1724 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 1725 error = ENOTDIR; 1726 goto out; 1727 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 1728 error = EISDIR; 1729 goto out; 1730 } 1731 } 1732 if (fvp == tdvp) 1733 error = EINVAL; 1734 /* 1735 * If source is the same as the destination (that is the 1736 * same inode number with the same name in the same directory), 1737 * then there is nothing to do. 1738 */ 1739 if (fvp == tvp && fromnd.ni_dvp == tdvp && 1740 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 1741 !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, 1742 fromnd.ni_cnd.cn_namelen)) 1743 error = -1; 1744 out: 1745 if (!error) { 1746 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 1747 if (fromnd.ni_dvp != tdvp) 1748 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1749 if (tvp) 1750 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 1751 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 1752 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 1753 } else { 1754 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 1755 if (tdvp == tvp) 1756 vrele(tdvp); 1757 else 1758 vput(tdvp); 1759 if (tvp) 1760 vput(tvp); 1761 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1762 vrele(fromnd.ni_dvp); 1763 vrele(fvp); 1764 } 1765 vrele(tond.ni_startdir); 1766 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 1767 out1: 1768 if (fromnd.ni_startdir) 1769 vrele(fromnd.ni_startdir); 1770 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 1771 if (error == -1) 1772 return (0); 1773 return (error); 1774 } 1775 1776 /* 1777 * Make a directory file. 1778 */ 1779 /* ARGSUSED */ 1780 sys_mkdir(p, v, retval) 1781 struct proc *p; 1782 void *v; 1783 register_t *retval; 1784 { 1785 register struct sys_mkdir_args /* { 1786 syscallarg(char *) path; 1787 syscallarg(int) mode; 1788 } */ *uap = v; 1789 register struct vnode *vp; 1790 struct vattr vattr; 1791 int error; 1792 struct nameidata nd; 1793 1794 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1795 if (error = namei(&nd)) 1796 return (error); 1797 vp = nd.ni_vp; 1798 if (vp != NULL) { 1799 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1800 if (nd.ni_dvp == vp) 1801 vrele(nd.ni_dvp); 1802 else 1803 vput(nd.ni_dvp); 1804 vrele(vp); 1805 return (EEXIST); 1806 } 1807 VATTR_NULL(&vattr); 1808 vattr.va_type = VDIR; 1809 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 1810 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1811 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1812 if (!error) 1813 vput(nd.ni_vp); 1814 return (error); 1815 } 1816 1817 /* 1818 * Remove a directory file. 1819 */ 1820 /* ARGSUSED */ 1821 sys_rmdir(p, v, retval) 1822 struct proc *p; 1823 void *v; 1824 register_t *retval; 1825 { 1826 struct sys_rmdir_args /* { 1827 syscallarg(char *) path; 1828 } */ *uap = v; 1829 register struct vnode *vp; 1830 int error; 1831 struct nameidata nd; 1832 1833 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1834 SCARG(uap, path), p); 1835 if (error = namei(&nd)) 1836 return (error); 1837 vp = nd.ni_vp; 1838 if (vp->v_type != VDIR) { 1839 error = ENOTDIR; 1840 goto out; 1841 } 1842 /* 1843 * No rmdir "." please. 1844 */ 1845 if (nd.ni_dvp == vp) { 1846 error = EINVAL; 1847 goto out; 1848 } 1849 /* 1850 * The root of a mounted filesystem cannot be deleted. 1851 */ 1852 if (vp->v_flag & VROOT) 1853 error = EBUSY; 1854 out: 1855 if (!error) { 1856 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1857 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1858 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1859 } else { 1860 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1861 if (nd.ni_dvp == vp) 1862 vrele(nd.ni_dvp); 1863 else 1864 vput(nd.ni_dvp); 1865 vput(vp); 1866 } 1867 return (error); 1868 } 1869 1870 /* 1871 * Read a block of directory entries in a file system independent format. 1872 */ 1873 sys_getdirentries(p, v, retval) 1874 struct proc *p; 1875 void *v; 1876 register_t *retval; 1877 { 1878 register struct sys_getdirentries_args /* { 1879 syscallarg(int) fd; 1880 syscallarg(char *) buf; 1881 syscallarg(u_int) count; 1882 syscallarg(long *) basep; 1883 } */ *uap = v; 1884 register struct vnode *vp; 1885 struct file *fp; 1886 struct uio auio; 1887 struct iovec aiov; 1888 long loff; 1889 int error, eofflag; 1890 1891 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1892 return (error); 1893 if ((fp->f_flag & FREAD) == 0) 1894 return (EBADF); 1895 vp = (struct vnode *)fp->f_data; 1896 unionread: 1897 if (vp->v_type != VDIR) 1898 return (EINVAL); 1899 aiov.iov_base = SCARG(uap, buf); 1900 aiov.iov_len = SCARG(uap, count); 1901 auio.uio_iov = &aiov; 1902 auio.uio_iovcnt = 1; 1903 auio.uio_rw = UIO_READ; 1904 auio.uio_segflg = UIO_USERSPACE; 1905 auio.uio_procp = p; 1906 auio.uio_resid = SCARG(uap, count); 1907 VOP_LOCK(vp); 1908 loff = auio.uio_offset = fp->f_offset; 1909 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, (u_long *)0, 0); 1910 fp->f_offset = auio.uio_offset; 1911 VOP_UNLOCK(vp); 1912 if (error) 1913 return (error); 1914 1915 #ifdef UNION 1916 { 1917 extern int (**union_vnodeop_p)(); 1918 extern struct vnode *union_dircache __P((struct vnode *)); 1919 1920 if ((SCARG(uap, count) == auio.uio_resid) && 1921 (vp->v_op == union_vnodeop_p)) { 1922 struct vnode *lvp; 1923 1924 lvp = union_dircache(vp); 1925 if (lvp != NULLVP) { 1926 struct vattr va; 1927 1928 /* 1929 * If the directory is opaque, 1930 * then don't show lower entries 1931 */ 1932 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 1933 if (va.va_flags & OPAQUE) { 1934 vput(lvp); 1935 lvp = NULL; 1936 } 1937 } 1938 1939 if (lvp != NULLVP) { 1940 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 1941 VOP_UNLOCK(lvp); 1942 1943 if (error) { 1944 vrele(lvp); 1945 return (error); 1946 } 1947 fp->f_data = (caddr_t) lvp; 1948 fp->f_offset = 0; 1949 error = vn_close(vp, FREAD, fp->f_cred, p); 1950 if (error) 1951 return (error); 1952 vp = lvp; 1953 goto unionread; 1954 } 1955 } 1956 } 1957 #endif /* UNION */ 1958 1959 if ((SCARG(uap, count) == auio.uio_resid) && 1960 (vp->v_flag & VROOT) && 1961 (vp->v_mount->mnt_flag & MNT_UNION)) { 1962 struct vnode *tvp = vp; 1963 vp = vp->v_mount->mnt_vnodecovered; 1964 VREF(vp); 1965 fp->f_data = (caddr_t) vp; 1966 fp->f_offset = 0; 1967 vrele(tvp); 1968 goto unionread; 1969 } 1970 error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), 1971 sizeof(long)); 1972 *retval = SCARG(uap, count) - auio.uio_resid; 1973 return (error); 1974 } 1975 1976 /* 1977 * Set the mode mask for creation of filesystem nodes. 1978 */ 1979 int 1980 sys_umask(p, v, retval) 1981 struct proc *p; 1982 void *v; 1983 register_t *retval; 1984 { 1985 struct sys_umask_args /* { 1986 syscallarg(int) newmask; 1987 } */ *uap = v; 1988 register struct filedesc *fdp; 1989 1990 fdp = p->p_fd; 1991 *retval = fdp->fd_cmask; 1992 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 1993 return (0); 1994 } 1995 1996 /* 1997 * Void all references to file by ripping underlying filesystem 1998 * away from vnode. 1999 */ 2000 /* ARGSUSED */ 2001 sys_revoke(p, v, retval) 2002 struct proc *p; 2003 void *v; 2004 register_t *retval; 2005 { 2006 register struct sys_revoke_args /* { 2007 syscallarg(char *) path; 2008 } */ *uap = v; 2009 register struct vnode *vp; 2010 struct vattr vattr; 2011 int error; 2012 struct nameidata nd; 2013 2014 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2015 if (error = namei(&nd)) 2016 return (error); 2017 vp = nd.ni_vp; 2018 if (vp->v_type != VCHR && vp->v_type != VBLK) { 2019 error = EINVAL; 2020 goto out; 2021 } 2022 if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) 2023 goto out; 2024 if (p->p_ucred->cr_uid != vattr.va_uid && 2025 (error = suser(p->p_ucred, &p->p_acflag))) 2026 goto out; 2027 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2028 vgoneall(vp); 2029 out: 2030 vrele(vp); 2031 return (error); 2032 } 2033 2034 /* 2035 * Convert a user file descriptor to a kernel file entry. 2036 */ 2037 getvnode(fdp, fd, fpp) 2038 struct filedesc *fdp; 2039 struct file **fpp; 2040 int fd; 2041 { 2042 struct file *fp; 2043 2044 if ((u_int)fd >= fdp->fd_nfiles || 2045 (fp = fdp->fd_ofiles[fd]) == NULL) 2046 return (EBADF); 2047 if (fp->f_type != DTYPE_VNODE) 2048 return (EINVAL); 2049 *fpp = fp; 2050 return (0); 2051 } 2052
Indexes created Fri Sep 26 08:10:20 GMT 2025