vfs_syscalls.c revision 1.66
1 /* $NetBSD: vfs_syscalls.c,v 1.66 1996/02/09 14:45:36 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/namei.h> 46 #include <sys/filedesc.h> 47 #include <sys/kernel.h> 48 #include <sys/file.h> 49 #include <sys/stat.h> 50 #include <sys/vnode.h> 51 #include <sys/mount.h> 52 #include <sys/proc.h> 53 #include <sys/uio.h> 54 #include <sys/malloc.h> 55 #include <sys/dirent.h> 56 57 #include <sys/syscallargs.h> 58 59 #include <vm/vm.h> 60 #include <sys/sysctl.h> 61 62 #include <kern/kern_extern.h> 63 64 static int change_dir __P((struct nameidata *, struct proc *)); 65 66 void checkdirs __P((struct vnode *)); 67 int dounmount __P((struct mount *, int, struct proc *)); 68 69 /* 70 * Virtual File System System Calls 71 */ 72 73 /* 74 * Mount a file system. 75 */ 76 /* ARGSUSED */ 77 int 78 sys_mount(p, v, retval) 79 struct proc *p; 80 void *v; 81 register_t *retval; 82 { 83 register struct sys_mount_args /* { 84 syscallarg(char *) type; 85 syscallarg(char *) path; 86 syscallarg(int) flags; 87 syscallarg(caddr_t) data; 88 } */ *uap = v; 89 register struct vnode *vp; 90 register struct mount *mp; 91 int error, flag = 0; 92 u_long fsindex = 0; 93 char fstypename[MFSNAMELEN]; 94 struct vattr va; 95 struct nameidata nd; 96 97 /* 98 * Get vnode to be covered 99 */ 100 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 101 SCARG(uap, path), p); 102 if ((error = namei(&nd)) != 0) 103 return (error); 104 vp = nd.ni_vp; 105 if (SCARG(uap, flags) & MNT_UPDATE) { 106 if ((vp->v_flag & VROOT) == 0) { 107 vput(vp); 108 return (EINVAL); 109 } 110 mp = vp->v_mount; 111 flag = mp->mnt_flag; 112 /* 113 * We only allow the filesystem to be reloaded if it 114 * is currently mounted read-only. 115 */ 116 if ((SCARG(uap, flags) & MNT_RELOAD) && 117 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 118 vput(vp); 119 return (EOPNOTSUPP); /* Needs translation */ 120 } 121 mp->mnt_flag |= 122 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 123 /* 124 * Only root, or the user that did the original mount is 125 * permitted to update it. 126 */ 127 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 128 (error = suser(p->p_ucred, &p->p_acflag))) { 129 vput(vp); 130 return (error); 131 } 132 /* 133 * Do not allow NFS export by non-root users. Silently 134 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 135 */ 136 if (p->p_ucred->cr_uid != 0) { 137 if (SCARG(uap, flags) & MNT_EXPORTED) { 138 vput(vp); 139 return (EPERM); 140 } 141 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 142 } 143 VOP_UNLOCK(vp); 144 goto update; 145 } 146 /* 147 * If the user is not root, ensure that they own the directory 148 * onto which we are attempting to mount. 149 */ 150 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) || 151 (va.va_uid != p->p_ucred->cr_uid && 152 (error = suser(p->p_ucred, &p->p_acflag)))) { 153 vput(vp); 154 return (error); 155 } 156 /* 157 * Do not allow NFS export by non-root users. Silently 158 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 159 */ 160 if (p->p_ucred->cr_uid != 0) { 161 if (SCARG(uap, flags) & MNT_EXPORTED) { 162 vput(vp); 163 return (EPERM); 164 } 165 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 166 } 167 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 168 return (error); 169 if (vp->v_type != VDIR) { 170 vput(vp); 171 return (ENOTDIR); 172 } 173 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 174 if (error) { 175 #if defined(COMPAT_09) || defined(COMPAT_43) 176 /* 177 * Historically filesystem types were identified by number. 178 * If we get an integer for the filesystem type instead of a 179 * string, we check to see if it matches one of the historic 180 * filesystem types. 181 */ 182 fsindex = (u_long)SCARG(uap, type); 183 if (fsindex >= nvfssw || vfssw[fsindex] == NULL) { 184 vput(vp); 185 return (ENODEV); 186 } 187 strncpy(fstypename, vfssw[fsindex]->vfs_name, MFSNAMELEN); 188 #else 189 vput(vp); 190 return (error); 191 #endif 192 } 193 #ifdef COMPAT_10 194 /* Accept `ufs' as an alias for `ffs'. */ 195 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 196 strncpy(fstypename, "ffs", MFSNAMELEN); 197 #endif 198 for (fsindex = 0; fsindex < nvfssw; fsindex++) 199 if (vfssw[fsindex] != NULL && 200 !strncmp(vfssw[fsindex]->vfs_name, fstypename, MFSNAMELEN)) 201 break; 202 if (fsindex >= nvfssw) { 203 vput(vp); 204 return (ENODEV); 205 } 206 if (vp->v_mountedhere != NULL) { 207 vput(vp); 208 return (EBUSY); 209 } 210 211 /* 212 * Allocate and initialize the file system. 213 */ 214 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 215 M_MOUNT, M_WAITOK); 216 bzero((char *)mp, (u_long)sizeof(struct mount)); 217 mp->mnt_op = vfssw[fsindex]; 218 if ((error = vfs_lock(mp)) != 0) { 219 free((caddr_t)mp, M_MOUNT); 220 vput(vp); 221 return (error); 222 } 223 /* Do this early in case we block later. */ 224 vfssw[fsindex]->vfs_refcount++; 225 vp->v_mountedhere = mp; 226 mp->mnt_vnodecovered = vp; 227 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 228 update: 229 /* 230 * Set the mount level flags. 231 */ 232 if (SCARG(uap, flags) & MNT_RDONLY) 233 mp->mnt_flag |= MNT_RDONLY; 234 else if (mp->mnt_flag & MNT_RDONLY) 235 mp->mnt_flag |= MNT_WANTRDWR; 236 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 237 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC); 238 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 239 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC); 240 /* 241 * Mount the filesystem. 242 */ 243 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 244 if (mp->mnt_flag & MNT_UPDATE) { 245 vrele(vp); 246 if (mp->mnt_flag & MNT_WANTRDWR) 247 mp->mnt_flag &= ~MNT_RDONLY; 248 mp->mnt_flag &=~ 249 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 250 if (error) 251 mp->mnt_flag = flag; 252 return (error); 253 } 254 /* 255 * Put the new filesystem on the mount list after root. 256 */ 257 cache_purge(vp); 258 if (!error) { 259 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 260 checkdirs(vp); 261 VOP_UNLOCK(vp); 262 vfs_unlock(mp); 263 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 264 error = VFS_START(mp, 0, p); 265 } else { 266 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 267 vfssw[fsindex]->vfs_refcount--; 268 vfs_unlock(mp); 269 free((caddr_t)mp, M_MOUNT); 270 vput(vp); 271 } 272 return (error); 273 } 274 275 /* 276 * Scan all active processes to see if any of them have a current 277 * or root directory onto which the new filesystem has just been 278 * mounted. If so, replace them with the new mount point. 279 */ 280 void 281 checkdirs(olddp) 282 struct vnode *olddp; 283 { 284 struct filedesc *fdp; 285 struct vnode *newdp; 286 struct proc *p; 287 288 if (olddp->v_usecount == 1) 289 return; 290 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 291 panic("mount: lost mount"); 292 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 293 fdp = p->p_fd; 294 if (fdp->fd_cdir == olddp) { 295 vrele(fdp->fd_cdir); 296 VREF(newdp); 297 fdp->fd_cdir = newdp; 298 } 299 if (fdp->fd_rdir == olddp) { 300 vrele(fdp->fd_rdir); 301 VREF(newdp); 302 fdp->fd_rdir = newdp; 303 } 304 } 305 if (rootvnode == olddp) { 306 vrele(rootvnode); 307 VREF(newdp); 308 rootvnode = newdp; 309 } 310 vput(newdp); 311 } 312 313 /* 314 * Unmount a file system. 315 * 316 * Note: unmount takes a path to the vnode mounted on as argument, 317 * not special file (as before). 318 */ 319 /* ARGSUSED */ 320 int 321 sys_unmount(p, v, retval) 322 struct proc *p; 323 void *v; 324 register_t *retval; 325 { 326 register struct sys_unmount_args /* { 327 syscallarg(char *) path; 328 syscallarg(int) flags; 329 } */ *uap = v; 330 register struct vnode *vp; 331 struct mount *mp; 332 int error; 333 struct nameidata nd; 334 335 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 336 SCARG(uap, path), p); 337 if ((error = namei(&nd)) != 0) 338 return (error); 339 vp = nd.ni_vp; 340 mp = vp->v_mount; 341 342 /* 343 * Only root, or the user that did the original mount is 344 * permitted to unmount this filesystem. 345 */ 346 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 347 (error = suser(p->p_ucred, &p->p_acflag))) { 348 vput(vp); 349 return (error); 350 } 351 352 /* 353 * Don't allow unmounting the root file system. 354 */ 355 if (mp->mnt_flag & MNT_ROOTFS) { 356 vput(vp); 357 return (EINVAL); 358 } 359 360 /* 361 * Must be the root of the filesystem 362 */ 363 if ((vp->v_flag & VROOT) == 0) { 364 vput(vp); 365 return (EINVAL); 366 } 367 vput(vp); 368 return (dounmount(mp, SCARG(uap, flags), p)); 369 } 370 371 /* 372 * Do the actual file system unmount. 373 */ 374 int 375 dounmount(mp, flags, p) 376 register struct mount *mp; 377 int flags; 378 struct proc *p; 379 { 380 struct vnode *coveredvp; 381 int error; 382 383 coveredvp = mp->mnt_vnodecovered; 384 if (vfs_busy(mp)) 385 return (EBUSY); 386 mp->mnt_flag |= MNT_UNMOUNT; 387 if ((error = vfs_lock(mp)) != 0) 388 return (error); 389 390 mp->mnt_flag &=~ MNT_ASYNC; 391 vnode_pager_umount(mp); /* release cached vnodes */ 392 cache_purgevfs(mp); /* remove cache entries for this file sys */ 393 if ((error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0 || 394 (flags & MNT_FORCE)) 395 error = VFS_UNMOUNT(mp, flags, p); 396 mp->mnt_flag &= ~MNT_UNMOUNT; 397 vfs_unbusy(mp); 398 if (error) { 399 vfs_unlock(mp); 400 } else { 401 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 402 if (coveredvp != NULLVP) { 403 vrele(coveredvp); 404 coveredvp->v_mountedhere = (struct mount *)0; 405 } 406 mp->mnt_op->vfs_refcount--; 407 vfs_unlock(mp); 408 if (mp->mnt_vnodelist.lh_first != NULL) 409 panic("unmount: dangling vnode"); 410 free((caddr_t)mp, M_MOUNT); 411 } 412 return (error); 413 } 414 415 /* 416 * Sync each mounted filesystem. 417 */ 418 #ifdef DEBUG 419 int syncprt = 0; 420 struct ctldebug debug0 = { "syncprt", &syncprt }; 421 #endif 422 423 /* ARGSUSED */ 424 int 425 sys_sync(p, v, retval) 426 struct proc *p; 427 void *v; 428 register_t *retval; 429 { 430 register struct mount *mp, *nmp; 431 int asyncflag; 432 433 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 434 /* 435 * Get the next pointer in case we hang on vfs_busy 436 * while we are being unmounted. 437 */ 438 nmp = mp->mnt_list.cqe_next; 439 /* 440 * The lock check below is to avoid races with mount 441 * and unmount. 442 */ 443 if ((mp->mnt_flag & (MNT_MLOCK|MNT_RDONLY|MNT_MPBUSY)) == 0 && 444 !vfs_busy(mp)) { 445 asyncflag = mp->mnt_flag & MNT_ASYNC; 446 mp->mnt_flag &= ~MNT_ASYNC; 447 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 448 if (asyncflag) 449 mp->mnt_flag |= MNT_ASYNC; 450 /* 451 * Get the next pointer again, as the next filesystem 452 * might have been unmounted while we were sync'ing. 453 */ 454 nmp = mp->mnt_list.cqe_next; 455 vfs_unbusy(mp); 456 } 457 } 458 #ifdef DEBUG 459 if (syncprt) 460 vfs_bufstats(); 461 #endif /* DEBUG */ 462 return (0); 463 } 464 465 /* 466 * Change filesystem quotas. 467 */ 468 /* ARGSUSED */ 469 int 470 sys_quotactl(p, v, retval) 471 struct proc *p; 472 void *v; 473 register_t *retval; 474 { 475 register struct sys_quotactl_args /* { 476 syscallarg(char *) path; 477 syscallarg(int) cmd; 478 syscallarg(int) uid; 479 syscallarg(caddr_t) arg; 480 } */ *uap = v; 481 register struct mount *mp; 482 int error; 483 struct nameidata nd; 484 485 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 486 if ((error = namei(&nd)) != 0) 487 return (error); 488 mp = nd.ni_vp->v_mount; 489 vrele(nd.ni_vp); 490 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 491 SCARG(uap, arg), p)); 492 } 493 494 /* 495 * Get filesystem statistics. 496 */ 497 /* ARGSUSED */ 498 int 499 sys_statfs(p, v, retval) 500 struct proc *p; 501 void *v; 502 register_t *retval; 503 { 504 register struct sys_statfs_args /* { 505 syscallarg(char *) path; 506 syscallarg(struct statfs *) buf; 507 } */ *uap = v; 508 register struct mount *mp; 509 register struct statfs *sp; 510 int error; 511 struct nameidata nd; 512 513 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 514 if ((error = namei(&nd)) != 0) 515 return (error); 516 mp = nd.ni_vp->v_mount; 517 sp = &mp->mnt_stat; 518 vrele(nd.ni_vp); 519 if ((error = VFS_STATFS(mp, sp, p)) != 0) 520 return (error); 521 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 522 return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); 523 } 524 525 /* 526 * Get filesystem statistics. 527 */ 528 /* ARGSUSED */ 529 int 530 sys_fstatfs(p, v, retval) 531 struct proc *p; 532 void *v; 533 register_t *retval; 534 { 535 register struct sys_fstatfs_args /* { 536 syscallarg(int) fd; 537 syscallarg(struct statfs *) buf; 538 } */ *uap = v; 539 struct file *fp; 540 struct mount *mp; 541 register struct statfs *sp; 542 int error; 543 544 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 545 return (error); 546 mp = ((struct vnode *)fp->f_data)->v_mount; 547 sp = &mp->mnt_stat; 548 if ((error = VFS_STATFS(mp, sp, p)) != 0) 549 return (error); 550 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 551 return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); 552 } 553 554 /* 555 * Get statistics on all filesystems. 556 */ 557 int 558 sys_getfsstat(p, v, retval) 559 struct proc *p; 560 void *v; 561 register_t *retval; 562 { 563 register struct sys_getfsstat_args /* { 564 syscallarg(struct statfs *) buf; 565 syscallarg(long) bufsize; 566 syscallarg(int) flags; 567 } */ *uap = v; 568 register struct mount *mp, *nmp; 569 register struct statfs *sp; 570 caddr_t sfsp; 571 long count, maxcount, error; 572 573 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 574 sfsp = (caddr_t)SCARG(uap, buf); 575 for (count = 0, 576 mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 577 nmp = mp->mnt_list.cqe_next; 578 if (sfsp && count < maxcount && 579 ((mp->mnt_flag & MNT_MLOCK) == 0)) { 580 sp = &mp->mnt_stat; 581 /* 582 * If MNT_NOWAIT is specified, do not refresh the 583 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 584 */ 585 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 586 (SCARG(uap, flags) & MNT_WAIT)) && 587 (error = VFS_STATFS(mp, sp, p))) 588 continue; 589 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 590 error = copyout((caddr_t)sp, sfsp, sizeof(*sp)); 591 if (error) 592 return (error); 593 sfsp += sizeof(*sp); 594 } 595 count++; 596 } 597 if (sfsp && count > maxcount) 598 *retval = maxcount; 599 else 600 *retval = count; 601 return (0); 602 } 603 604 /* 605 * Change current working directory to a given file descriptor. 606 */ 607 /* ARGSUSED */ 608 int 609 sys_fchdir(p, v, retval) 610 struct proc *p; 611 void *v; 612 register_t *retval; 613 { 614 struct sys_fchdir_args /* { 615 syscallarg(int) fd; 616 } */ *uap = v; 617 register struct filedesc *fdp = p->p_fd; 618 struct vnode *vp, *tdp; 619 struct mount *mp; 620 struct file *fp; 621 int error; 622 623 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 624 return (error); 625 vp = (struct vnode *)fp->f_data; 626 VREF(vp); 627 VOP_LOCK(vp); 628 if (vp->v_type != VDIR) 629 error = ENOTDIR; 630 else 631 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 632 while (!error && (mp = vp->v_mountedhere) != NULL) { 633 if (mp->mnt_flag & MNT_MLOCK) { 634 mp->mnt_flag |= MNT_MWAIT; 635 sleep((caddr_t)mp, PVFS); 636 continue; 637 } 638 if ((error = VFS_ROOT(mp, &tdp)) != 0) 639 break; 640 vput(vp); 641 vp = tdp; 642 } 643 VOP_UNLOCK(vp); 644 if (error) { 645 vrele(vp); 646 return (error); 647 } 648 vrele(fdp->fd_cdir); 649 fdp->fd_cdir = vp; 650 return (0); 651 } 652 653 /* 654 * Change current working directory (``.''). 655 */ 656 /* ARGSUSED */ 657 int 658 sys_chdir(p, v, retval) 659 struct proc *p; 660 void *v; 661 register_t *retval; 662 { 663 struct sys_chdir_args /* { 664 syscallarg(char *) path; 665 } */ *uap = v; 666 register struct filedesc *fdp = p->p_fd; 667 int error; 668 struct nameidata nd; 669 670 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 671 SCARG(uap, path), p); 672 if ((error = change_dir(&nd, p)) != 0) 673 return (error); 674 vrele(fdp->fd_cdir); 675 fdp->fd_cdir = nd.ni_vp; 676 return (0); 677 } 678 679 /* 680 * Change notion of root (``/'') directory. 681 */ 682 /* ARGSUSED */ 683 int 684 sys_chroot(p, v, retval) 685 struct proc *p; 686 void *v; 687 register_t *retval; 688 { 689 struct sys_chroot_args /* { 690 syscallarg(char *) path; 691 } */ *uap = v; 692 register struct filedesc *fdp = p->p_fd; 693 int error; 694 struct nameidata nd; 695 696 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 697 return (error); 698 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 699 SCARG(uap, path), p); 700 if ((error = change_dir(&nd, p)) != 0) 701 return (error); 702 if (fdp->fd_rdir != NULL) 703 vrele(fdp->fd_rdir); 704 fdp->fd_rdir = nd.ni_vp; 705 return (0); 706 } 707 708 /* 709 * Common routine for chroot and chdir. 710 */ 711 static int 712 change_dir(ndp, p) 713 register struct nameidata *ndp; 714 struct proc *p; 715 { 716 struct vnode *vp; 717 int error; 718 719 if ((error = namei(ndp)) != 0) 720 return (error); 721 vp = ndp->ni_vp; 722 if (vp->v_type != VDIR) 723 error = ENOTDIR; 724 else 725 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 726 VOP_UNLOCK(vp); 727 if (error) 728 vrele(vp); 729 return (error); 730 } 731 732 /* 733 * Check permissions, allocate an open file structure, 734 * and call the device open routine if any. 735 */ 736 int 737 sys_open(p, v, retval) 738 struct proc *p; 739 void *v; 740 register_t *retval; 741 { 742 register struct sys_open_args /* { 743 syscallarg(char *) path; 744 syscallarg(int) flags; 745 syscallarg(int) mode; 746 } */ *uap = v; 747 register struct filedesc *fdp = p->p_fd; 748 register struct file *fp; 749 register struct vnode *vp; 750 int flags, cmode; 751 struct file *nfp; 752 int type, indx, error; 753 struct flock lf; 754 struct nameidata nd; 755 extern struct fileops vnops; 756 757 if ((error = falloc(p, &nfp, &indx)) != 0) 758 return (error); 759 fp = nfp; 760 flags = FFLAGS(SCARG(uap, flags)); 761 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 762 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 763 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 764 if ((error = vn_open(&nd, flags, cmode)) != 0) { 765 ffree(fp); 766 if ((error == ENODEV || error == ENXIO) && 767 p->p_dupfd >= 0 && /* XXX from fdopen */ 768 (error = 769 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 770 *retval = indx; 771 return (0); 772 } 773 if (error == ERESTART) 774 error = EINTR; 775 fdp->fd_ofiles[indx] = NULL; 776 return (error); 777 } 778 p->p_dupfd = 0; 779 vp = nd.ni_vp; 780 fp->f_flag = flags & FMASK; 781 fp->f_type = DTYPE_VNODE; 782 fp->f_ops = &vnops; 783 fp->f_data = (caddr_t)vp; 784 if (flags & (O_EXLOCK | O_SHLOCK)) { 785 lf.l_whence = SEEK_SET; 786 lf.l_start = 0; 787 lf.l_len = 0; 788 if (flags & O_EXLOCK) 789 lf.l_type = F_WRLCK; 790 else 791 lf.l_type = F_RDLCK; 792 type = F_FLOCK; 793 if ((flags & FNONBLOCK) == 0) 794 type |= F_WAIT; 795 VOP_UNLOCK(vp); 796 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 797 if (error) { 798 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 799 ffree(fp); 800 fdp->fd_ofiles[indx] = NULL; 801 return (error); 802 } 803 VOP_LOCK(vp); 804 fp->f_flag |= FHASLOCK; 805 } 806 VOP_UNLOCK(vp); 807 *retval = indx; 808 return (0); 809 } 810 811 /* 812 * Create a special file. 813 */ 814 /* ARGSUSED */ 815 int 816 sys_mknod(p, v, retval) 817 struct proc *p; 818 void *v; 819 register_t *retval; 820 { 821 register struct sys_mknod_args /* { 822 syscallarg(char *) path; 823 syscallarg(int) mode; 824 syscallarg(int) dev; 825 } */ *uap = v; 826 register struct vnode *vp; 827 struct vattr vattr; 828 int error; 829 int whiteout = 0; 830 struct nameidata nd; 831 832 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 833 return (error); 834 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 835 if ((error = namei(&nd)) != 0) 836 return (error); 837 vp = nd.ni_vp; 838 if (vp != NULL) 839 error = EEXIST; 840 else { 841 VATTR_NULL(&vattr); 842 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 843 vattr.va_rdev = SCARG(uap, dev); 844 whiteout = 0; 845 846 switch (SCARG(uap, mode) & S_IFMT) { 847 case S_IFMT: /* used by badsect to flag bad sectors */ 848 vattr.va_type = VBAD; 849 break; 850 case S_IFCHR: 851 vattr.va_type = VCHR; 852 break; 853 case S_IFBLK: 854 vattr.va_type = VBLK; 855 break; 856 case S_IFWHT: 857 whiteout = 1; 858 break; 859 default: 860 error = EINVAL; 861 break; 862 } 863 } 864 if (!error) { 865 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 866 if (whiteout) { 867 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 868 if (error) 869 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 870 vput(nd.ni_dvp); 871 } else { 872 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 873 &nd.ni_cnd, &vattr); 874 } 875 } else { 876 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 877 if (nd.ni_dvp == vp) 878 vrele(nd.ni_dvp); 879 else 880 vput(nd.ni_dvp); 881 if (vp) 882 vrele(vp); 883 } 884 return (error); 885 } 886 887 /* 888 * Create a named pipe. 889 */ 890 /* ARGSUSED */ 891 int 892 sys_mkfifo(p, v, retval) 893 struct proc *p; 894 void *v; 895 register_t *retval; 896 { 897 register struct sys_mkfifo_args /* { 898 syscallarg(char *) path; 899 syscallarg(int) mode; 900 } */ *uap = v; 901 struct vattr vattr; 902 int error; 903 struct nameidata nd; 904 905 #ifndef FIFO 906 return (EOPNOTSUPP); 907 #else 908 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 909 if ((error = namei(&nd)) != 0) 910 return (error); 911 if (nd.ni_vp != NULL) { 912 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 913 if (nd.ni_dvp == nd.ni_vp) 914 vrele(nd.ni_dvp); 915 else 916 vput(nd.ni_dvp); 917 vrele(nd.ni_vp); 918 return (EEXIST); 919 } 920 VATTR_NULL(&vattr); 921 vattr.va_type = VFIFO; 922 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 923 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 924 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 925 #endif /* FIFO */ 926 } 927 928 /* 929 * Make a hard file link. 930 */ 931 /* ARGSUSED */ 932 int 933 sys_link(p, v, retval) 934 struct proc *p; 935 void *v; 936 register_t *retval; 937 { 938 register struct sys_link_args /* { 939 syscallarg(char *) path; 940 syscallarg(char *) link; 941 } */ *uap = v; 942 register struct vnode *vp; 943 struct nameidata nd; 944 int error; 945 946 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 947 if ((error = namei(&nd)) != 0) 948 return (error); 949 vp = nd.ni_vp; 950 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 951 if ((error = namei(&nd)) != 0) 952 goto out; 953 if (nd.ni_vp) { 954 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 955 if (nd.ni_dvp == nd.ni_vp) 956 vrele(nd.ni_dvp); 957 else 958 vput(nd.ni_dvp); 959 vrele(nd.ni_vp); 960 error = EEXIST; 961 goto out; 962 } 963 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 964 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 965 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 966 out: 967 vrele(vp); 968 return (error); 969 } 970 971 /* 972 * Make a symbolic link. 973 */ 974 /* ARGSUSED */ 975 int 976 sys_symlink(p, v, retval) 977 struct proc *p; 978 void *v; 979 register_t *retval; 980 { 981 register struct sys_symlink_args /* { 982 syscallarg(char *) path; 983 syscallarg(char *) link; 984 } */ *uap = v; 985 struct vattr vattr; 986 char *path; 987 int error; 988 struct nameidata nd; 989 990 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 991 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 992 if (error) 993 goto out; 994 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 995 if ((error = namei(&nd)) != 0) 996 goto out; 997 if (nd.ni_vp) { 998 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 999 if (nd.ni_dvp == nd.ni_vp) 1000 vrele(nd.ni_dvp); 1001 else 1002 vput(nd.ni_dvp); 1003 vrele(nd.ni_vp); 1004 error = EEXIST; 1005 goto out; 1006 } 1007 VATTR_NULL(&vattr); 1008 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1009 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1010 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1011 out: 1012 FREE(path, M_NAMEI); 1013 return (error); 1014 } 1015 1016 /* 1017 * Delete a whiteout from the filesystem. 1018 */ 1019 /* ARGSUSED */ 1020 int 1021 sys_undelete(p, v, retval) 1022 struct proc *p; 1023 void *v; 1024 register_t *retval; 1025 { 1026 register struct sys_undelete_args /* { 1027 syscallarg(char *) path; 1028 } */ *uap = v; 1029 int error; 1030 struct nameidata nd; 1031 1032 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1033 SCARG(uap, path), p); 1034 error = namei(&nd); 1035 if (error) 1036 return (error); 1037 1038 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1039 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1040 if (nd.ni_dvp == nd.ni_vp) 1041 vrele(nd.ni_dvp); 1042 else 1043 vput(nd.ni_dvp); 1044 if (nd.ni_vp) 1045 vrele(nd.ni_vp); 1046 return (EEXIST); 1047 } 1048 1049 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1050 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1051 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1052 vput(nd.ni_dvp); 1053 return (error); 1054 } 1055 1056 /* 1057 * Delete a name from the filesystem. 1058 */ 1059 /* ARGSUSED */ 1060 int 1061 sys_unlink(p, v, retval) 1062 struct proc *p; 1063 void *v; 1064 register_t *retval; 1065 { 1066 struct sys_unlink_args /* { 1067 syscallarg(char *) path; 1068 } */ *uap = v; 1069 register struct vnode *vp; 1070 int error; 1071 struct nameidata nd; 1072 1073 NDINIT(&nd, DELETE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1074 if ((error = namei(&nd)) != 0) 1075 return (error); 1076 vp = nd.ni_vp; 1077 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1078 VOP_LOCK(vp); 1079 1080 /* 1081 * The root of a mounted filesystem cannot be deleted. 1082 */ 1083 if (vp->v_flag & VROOT) { 1084 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1085 if (nd.ni_dvp == vp) 1086 vrele(nd.ni_dvp); 1087 else 1088 vput(nd.ni_dvp); 1089 vput(vp); 1090 error = EBUSY; 1091 goto out; 1092 } 1093 1094 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1095 (void)vnode_pager_uncache(vp); 1096 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1097 out: 1098 return (error); 1099 } 1100 1101 /* 1102 * Reposition read/write file offset. 1103 */ 1104 int 1105 sys_lseek(p, v, retval) 1106 struct proc *p; 1107 void *v; 1108 register_t *retval; 1109 { 1110 register struct sys_lseek_args /* { 1111 syscallarg(int) fd; 1112 syscallarg(int) pad; 1113 syscallarg(off_t) offset; 1114 syscallarg(int) whence; 1115 } */ *uap = v; 1116 struct ucred *cred = p->p_ucred; 1117 register struct filedesc *fdp = p->p_fd; 1118 register struct file *fp; 1119 struct vattr vattr; 1120 int error; 1121 1122 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1123 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1124 return (EBADF); 1125 if (fp->f_type != DTYPE_VNODE) 1126 return (ESPIPE); 1127 switch (SCARG(uap, whence)) { 1128 case L_INCR: 1129 fp->f_offset += SCARG(uap, offset); 1130 break; 1131 case L_XTND: 1132 error = VOP_GETATTR((struct vnode *)fp->f_data, &vattr, 1133 cred, p); 1134 if (error) 1135 return (error); 1136 fp->f_offset = SCARG(uap, offset) + vattr.va_size; 1137 break; 1138 case L_SET: 1139 fp->f_offset = SCARG(uap, offset); 1140 break; 1141 default: 1142 return (EINVAL); 1143 } 1144 *(off_t *)retval = fp->f_offset; 1145 return (0); 1146 } 1147 1148 /* 1149 * Check access permissions. 1150 */ 1151 int 1152 sys_access(p, v, retval) 1153 struct proc *p; 1154 void *v; 1155 register_t *retval; 1156 { 1157 register struct sys_access_args /* { 1158 syscallarg(char *) path; 1159 syscallarg(int) flags; 1160 } */ *uap = v; 1161 register struct ucred *cred = p->p_ucred; 1162 register struct vnode *vp; 1163 int error, flags, t_gid, t_uid; 1164 struct nameidata nd; 1165 1166 t_uid = cred->cr_uid; 1167 t_gid = cred->cr_gid; 1168 cred->cr_uid = p->p_cred->p_ruid; 1169 cred->cr_gid = p->p_cred->p_rgid; 1170 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1171 SCARG(uap, path), p); 1172 if ((error = namei(&nd)) != 0) 1173 goto out1; 1174 vp = nd.ni_vp; 1175 1176 /* Flags == 0 means only check for existence. */ 1177 if (SCARG(uap, flags)) { 1178 flags = 0; 1179 if (SCARG(uap, flags) & R_OK) 1180 flags |= VREAD; 1181 if (SCARG(uap, flags) & W_OK) 1182 flags |= VWRITE; 1183 if (SCARG(uap, flags) & X_OK) 1184 flags |= VEXEC; 1185 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1186 error = VOP_ACCESS(vp, flags, cred, p); 1187 } 1188 vput(vp); 1189 out1: 1190 cred->cr_uid = t_uid; 1191 cred->cr_gid = t_gid; 1192 return (error); 1193 } 1194 1195 /* 1196 * Get file status; this version follows links. 1197 */ 1198 /* ARGSUSED */ 1199 int 1200 sys_stat(p, v, retval) 1201 struct proc *p; 1202 void *v; 1203 register_t *retval; 1204 { 1205 register struct sys_stat_args /* { 1206 syscallarg(char *) path; 1207 syscallarg(struct stat *) ub; 1208 } */ *uap = v; 1209 struct stat sb; 1210 int error; 1211 struct nameidata nd; 1212 1213 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1214 SCARG(uap, path), p); 1215 if ((error = namei(&nd)) != 0) 1216 return (error); 1217 error = vn_stat(nd.ni_vp, &sb, p); 1218 vput(nd.ni_vp); 1219 if (error) 1220 return (error); 1221 error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); 1222 return (error); 1223 } 1224 1225 /* 1226 * Get file status; this version does not follow links. 1227 */ 1228 /* ARGSUSED */ 1229 int 1230 sys_lstat(p, v, retval) 1231 struct proc *p; 1232 void *v; 1233 register_t *retval; 1234 { 1235 register struct sys_lstat_args /* { 1236 syscallarg(char *) path; 1237 syscallarg(struct stat *) ub; 1238 } */ *uap = v; 1239 struct stat sb; 1240 int error; 1241 struct nameidata nd; 1242 1243 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1244 SCARG(uap, path), p); 1245 if ((error = namei(&nd)) != 0) 1246 return (error); 1247 error = vn_stat(nd.ni_vp, &sb, p); 1248 vput(nd.ni_vp); 1249 if (error) 1250 return (error); 1251 error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); 1252 return (error); 1253 } 1254 1255 /* 1256 * Get configurable pathname variables. 1257 */ 1258 /* ARGSUSED */ 1259 int 1260 sys_pathconf(p, v, retval) 1261 struct proc *p; 1262 void *v; 1263 register_t *retval; 1264 { 1265 register struct sys_pathconf_args /* { 1266 syscallarg(char *) path; 1267 syscallarg(int) name; 1268 } */ *uap = v; 1269 int error; 1270 struct nameidata nd; 1271 1272 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1273 SCARG(uap, path), p); 1274 if ((error = namei(&nd)) != 0) 1275 return (error); 1276 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1277 vput(nd.ni_vp); 1278 return (error); 1279 } 1280 1281 /* 1282 * Return target name of a symbolic link. 1283 */ 1284 /* ARGSUSED */ 1285 int 1286 sys_readlink(p, v, retval) 1287 struct proc *p; 1288 void *v; 1289 register_t *retval; 1290 { 1291 register struct sys_readlink_args /* { 1292 syscallarg(char *) path; 1293 syscallarg(char *) buf; 1294 syscallarg(int) count; 1295 } */ *uap = v; 1296 register struct vnode *vp; 1297 struct iovec aiov; 1298 struct uio auio; 1299 int error; 1300 struct nameidata nd; 1301 1302 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1303 SCARG(uap, path), p); 1304 if ((error = namei(&nd)) != 0) 1305 return (error); 1306 vp = nd.ni_vp; 1307 if (vp->v_type != VLNK) 1308 error = EINVAL; 1309 else { 1310 aiov.iov_base = SCARG(uap, buf); 1311 aiov.iov_len = SCARG(uap, count); 1312 auio.uio_iov = &aiov; 1313 auio.uio_iovcnt = 1; 1314 auio.uio_offset = 0; 1315 auio.uio_rw = UIO_READ; 1316 auio.uio_segflg = UIO_USERSPACE; 1317 auio.uio_procp = p; 1318 auio.uio_resid = SCARG(uap, count); 1319 error = VOP_READLINK(vp, &auio, p->p_ucred); 1320 } 1321 vput(vp); 1322 *retval = SCARG(uap, count) - auio.uio_resid; 1323 return (error); 1324 } 1325 1326 /* 1327 * Change flags of a file given a path name. 1328 */ 1329 /* ARGSUSED */ 1330 int 1331 sys_chflags(p, v, retval) 1332 struct proc *p; 1333 void *v; 1334 register_t *retval; 1335 { 1336 register struct sys_chflags_args /* { 1337 syscallarg(char *) path; 1338 syscallarg(int) flags; 1339 } */ *uap = v; 1340 register struct vnode *vp; 1341 struct vattr vattr; 1342 int error; 1343 struct nameidata nd; 1344 1345 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1346 if ((error = namei(&nd)) != 0) 1347 return (error); 1348 vp = nd.ni_vp; 1349 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1350 VOP_LOCK(vp); 1351 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1352 error = EROFS; 1353 else { 1354 VATTR_NULL(&vattr); 1355 vattr.va_flags = SCARG(uap, flags); 1356 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1357 } 1358 vput(vp); 1359 return (error); 1360 } 1361 1362 /* 1363 * Change flags of a file given a file descriptor. 1364 */ 1365 /* ARGSUSED */ 1366 int 1367 sys_fchflags(p, v, retval) 1368 struct proc *p; 1369 void *v; 1370 register_t *retval; 1371 { 1372 register struct sys_fchflags_args /* { 1373 syscallarg(int) fd; 1374 syscallarg(int) flags; 1375 } */ *uap = v; 1376 struct vattr vattr; 1377 struct vnode *vp; 1378 struct file *fp; 1379 int error; 1380 1381 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1382 return (error); 1383 vp = (struct vnode *)fp->f_data; 1384 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1385 VOP_LOCK(vp); 1386 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1387 error = EROFS; 1388 else { 1389 VATTR_NULL(&vattr); 1390 vattr.va_flags = SCARG(uap, flags); 1391 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1392 } 1393 VOP_UNLOCK(vp); 1394 return (error); 1395 } 1396 1397 /* 1398 * Change mode of a file given path name. 1399 */ 1400 /* ARGSUSED */ 1401 int 1402 sys_chmod(p, v, retval) 1403 struct proc *p; 1404 void *v; 1405 register_t *retval; 1406 { 1407 register struct sys_chmod_args /* { 1408 syscallarg(char *) path; 1409 syscallarg(int) mode; 1410 } */ *uap = v; 1411 register struct vnode *vp; 1412 struct vattr vattr; 1413 int error; 1414 struct nameidata nd; 1415 1416 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1417 if ((error = namei(&nd)) != 0) 1418 return (error); 1419 vp = nd.ni_vp; 1420 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1421 VOP_LOCK(vp); 1422 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1423 error = EROFS; 1424 else { 1425 VATTR_NULL(&vattr); 1426 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1427 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1428 } 1429 vput(vp); 1430 return (error); 1431 } 1432 1433 /* 1434 * Change mode of a file given a file descriptor. 1435 */ 1436 /* ARGSUSED */ 1437 int 1438 sys_fchmod(p, v, retval) 1439 struct proc *p; 1440 void *v; 1441 register_t *retval; 1442 { 1443 register struct sys_fchmod_args /* { 1444 syscallarg(int) fd; 1445 syscallarg(int) mode; 1446 } */ *uap = v; 1447 struct vattr vattr; 1448 struct vnode *vp; 1449 struct file *fp; 1450 int error; 1451 1452 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1453 return (error); 1454 vp = (struct vnode *)fp->f_data; 1455 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1456 VOP_LOCK(vp); 1457 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1458 error = EROFS; 1459 else { 1460 VATTR_NULL(&vattr); 1461 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1462 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1463 } 1464 VOP_UNLOCK(vp); 1465 return (error); 1466 } 1467 1468 /* 1469 * Set ownership given a path name. 1470 */ 1471 /* ARGSUSED */ 1472 int 1473 sys_chown(p, v, retval) 1474 struct proc *p; 1475 void *v; 1476 register_t *retval; 1477 { 1478 register struct sys_chown_args /* { 1479 syscallarg(char *) path; 1480 syscallarg(int) uid; 1481 syscallarg(int) gid; 1482 } */ *uap = v; 1483 register struct vnode *vp; 1484 struct vattr vattr; 1485 int error; 1486 struct nameidata nd; 1487 1488 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1489 if ((error = namei(&nd)) != 0) 1490 return (error); 1491 vp = nd.ni_vp; 1492 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1493 VOP_LOCK(vp); 1494 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1495 error = EROFS; 1496 else { 1497 VATTR_NULL(&vattr); 1498 vattr.va_uid = SCARG(uap, uid); 1499 vattr.va_gid = SCARG(uap, gid); 1500 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1501 } 1502 vput(vp); 1503 return (error); 1504 } 1505 1506 /* 1507 * Set ownership given a file descriptor. 1508 */ 1509 /* ARGSUSED */ 1510 int 1511 sys_fchown(p, v, retval) 1512 struct proc *p; 1513 void *v; 1514 register_t *retval; 1515 { 1516 register struct sys_fchown_args /* { 1517 syscallarg(int) fd; 1518 syscallarg(int) uid; 1519 syscallarg(int) gid; 1520 } */ *uap = v; 1521 struct vattr vattr; 1522 struct vnode *vp; 1523 struct file *fp; 1524 int error; 1525 1526 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1527 return (error); 1528 vp = (struct vnode *)fp->f_data; 1529 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1530 VOP_LOCK(vp); 1531 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1532 error = EROFS; 1533 else { 1534 VATTR_NULL(&vattr); 1535 vattr.va_uid = SCARG(uap, uid); 1536 vattr.va_gid = SCARG(uap, gid); 1537 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1538 } 1539 VOP_UNLOCK(vp); 1540 return (error); 1541 } 1542 1543 /* 1544 * Set the access and modification times of a file. 1545 */ 1546 /* ARGSUSED */ 1547 int 1548 sys_utimes(p, v, retval) 1549 struct proc *p; 1550 void *v; 1551 register_t *retval; 1552 { 1553 register struct sys_utimes_args /* { 1554 syscallarg(char *) path; 1555 syscallarg(struct timeval *) tptr; 1556 } */ *uap = v; 1557 register struct vnode *vp; 1558 struct timeval tv[2]; 1559 struct vattr vattr; 1560 int error; 1561 struct nameidata nd; 1562 1563 VATTR_NULL(&vattr); 1564 if (SCARG(uap, tptr) == NULL) { 1565 microtime(&tv[0]); 1566 tv[1] = tv[0]; 1567 vattr.va_vaflags |= VA_UTIMES_NULL; 1568 } 1569 else { 1570 error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv, 1571 sizeof (tv)); 1572 if (error) 1573 return (error); 1574 } 1575 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1576 if ((error = namei(&nd)) != 0) 1577 return (error); 1578 vp = nd.ni_vp; 1579 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1580 VOP_LOCK(vp); 1581 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1582 error = EROFS; 1583 else { 1584 vattr.va_atime.tv_sec = tv[0].tv_sec; 1585 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1586 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1587 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1588 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1589 } 1590 vput(vp); 1591 return (error); 1592 } 1593 1594 /* 1595 * Truncate a file given its path name. 1596 */ 1597 /* ARGSUSED */ 1598 int 1599 sys_truncate(p, v, retval) 1600 struct proc *p; 1601 void *v; 1602 register_t *retval; 1603 { 1604 register struct sys_truncate_args /* { 1605 syscallarg(char *) path; 1606 syscallarg(int) pad; 1607 syscallarg(off_t) length; 1608 } */ *uap = v; 1609 register struct vnode *vp; 1610 struct vattr vattr; 1611 int error; 1612 struct nameidata nd; 1613 1614 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1615 if ((error = namei(&nd)) != 0) 1616 return (error); 1617 vp = nd.ni_vp; 1618 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1619 VOP_LOCK(vp); 1620 if (vp->v_type == VDIR) 1621 error = EISDIR; 1622 else if ((error = vn_writechk(vp)) == 0 && 1623 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1624 VATTR_NULL(&vattr); 1625 vattr.va_size = SCARG(uap, length); 1626 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1627 } 1628 vput(vp); 1629 return (error); 1630 } 1631 1632 /* 1633 * Truncate a file given a file descriptor. 1634 */ 1635 /* ARGSUSED */ 1636 int 1637 sys_ftruncate(p, v, retval) 1638 struct proc *p; 1639 void *v; 1640 register_t *retval; 1641 { 1642 register struct sys_ftruncate_args /* { 1643 syscallarg(int) fd; 1644 syscallarg(int) pad; 1645 syscallarg(off_t) length; 1646 } */ *uap = v; 1647 struct vattr vattr; 1648 struct vnode *vp; 1649 struct file *fp; 1650 int error; 1651 1652 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1653 return (error); 1654 if ((fp->f_flag & FWRITE) == 0) 1655 return (EINVAL); 1656 vp = (struct vnode *)fp->f_data; 1657 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1658 VOP_LOCK(vp); 1659 if (vp->v_type == VDIR) 1660 error = EISDIR; 1661 else if ((error = vn_writechk(vp)) == 0) { 1662 VATTR_NULL(&vattr); 1663 vattr.va_size = SCARG(uap, length); 1664 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1665 } 1666 VOP_UNLOCK(vp); 1667 return (error); 1668 } 1669 1670 /* 1671 * Sync an open file. 1672 */ 1673 /* ARGSUSED */ 1674 int 1675 sys_fsync(p, v, retval) 1676 struct proc *p; 1677 void *v; 1678 register_t *retval; 1679 { 1680 struct sys_fsync_args /* { 1681 syscallarg(int) fd; 1682 } */ *uap = v; 1683 register struct vnode *vp; 1684 struct file *fp; 1685 int error; 1686 1687 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1688 return (error); 1689 vp = (struct vnode *)fp->f_data; 1690 VOP_LOCK(vp); 1691 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p); 1692 VOP_UNLOCK(vp); 1693 return (error); 1694 } 1695 1696 /* 1697 * Rename files. Source and destination must either both be directories, 1698 * or both not be directories. If target is a directory, it must be empty. 1699 */ 1700 /* ARGSUSED */ 1701 int 1702 sys_rename(p, v, retval) 1703 struct proc *p; 1704 void *v; 1705 register_t *retval; 1706 { 1707 register struct sys_rename_args /* { 1708 syscallarg(char *) from; 1709 syscallarg(char *) to; 1710 } */ *uap = v; 1711 register struct vnode *tvp, *fvp, *tdvp; 1712 struct nameidata fromnd, tond; 1713 int error; 1714 1715 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 1716 SCARG(uap, from), p); 1717 if ((error = namei(&fromnd)) != 0) 1718 return (error); 1719 fvp = fromnd.ni_vp; 1720 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 1721 UIO_USERSPACE, SCARG(uap, to), p); 1722 if ((error = namei(&tond)) != 0) { 1723 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1724 vrele(fromnd.ni_dvp); 1725 vrele(fvp); 1726 goto out1; 1727 } 1728 tdvp = tond.ni_dvp; 1729 tvp = tond.ni_vp; 1730 if (tvp != NULL) { 1731 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 1732 error = ENOTDIR; 1733 goto out; 1734 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 1735 error = EISDIR; 1736 goto out; 1737 } 1738 } 1739 if (fvp == tdvp) 1740 error = EINVAL; 1741 /* 1742 * If source is the same as the destination (that is the 1743 * same inode number with the same name in the same directory), 1744 * then there is nothing to do. 1745 */ 1746 if (fvp == tvp && fromnd.ni_dvp == tdvp && 1747 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 1748 !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, 1749 fromnd.ni_cnd.cn_namelen)) 1750 error = -1; 1751 out: 1752 if (!error) { 1753 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 1754 if (fromnd.ni_dvp != tdvp) 1755 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1756 if (tvp) 1757 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 1758 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 1759 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 1760 } else { 1761 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 1762 if (tdvp == tvp) 1763 vrele(tdvp); 1764 else 1765 vput(tdvp); 1766 if (tvp) 1767 vput(tvp); 1768 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1769 vrele(fromnd.ni_dvp); 1770 vrele(fvp); 1771 } 1772 vrele(tond.ni_startdir); 1773 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 1774 out1: 1775 if (fromnd.ni_startdir) 1776 vrele(fromnd.ni_startdir); 1777 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 1778 if (error == -1) 1779 return (0); 1780 return (error); 1781 } 1782 1783 /* 1784 * Make a directory file. 1785 */ 1786 /* ARGSUSED */ 1787 int 1788 sys_mkdir(p, v, retval) 1789 struct proc *p; 1790 void *v; 1791 register_t *retval; 1792 { 1793 register struct sys_mkdir_args /* { 1794 syscallarg(char *) path; 1795 syscallarg(int) mode; 1796 } */ *uap = v; 1797 register struct vnode *vp; 1798 struct vattr vattr; 1799 int error; 1800 struct nameidata nd; 1801 1802 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1803 if ((error = namei(&nd)) != 0) 1804 return (error); 1805 vp = nd.ni_vp; 1806 if (vp != NULL) { 1807 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1808 if (nd.ni_dvp == vp) 1809 vrele(nd.ni_dvp); 1810 else 1811 vput(nd.ni_dvp); 1812 vrele(vp); 1813 return (EEXIST); 1814 } 1815 VATTR_NULL(&vattr); 1816 vattr.va_type = VDIR; 1817 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 1818 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1819 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1820 if (!error) 1821 vput(nd.ni_vp); 1822 return (error); 1823 } 1824 1825 /* 1826 * Remove a directory file. 1827 */ 1828 /* ARGSUSED */ 1829 int 1830 sys_rmdir(p, v, retval) 1831 struct proc *p; 1832 void *v; 1833 register_t *retval; 1834 { 1835 struct sys_rmdir_args /* { 1836 syscallarg(char *) path; 1837 } */ *uap = v; 1838 register struct vnode *vp; 1839 int error; 1840 struct nameidata nd; 1841 1842 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1843 SCARG(uap, path), p); 1844 if ((error = namei(&nd)) != 0) 1845 return (error); 1846 vp = nd.ni_vp; 1847 if (vp->v_type != VDIR) { 1848 error = ENOTDIR; 1849 goto out; 1850 } 1851 /* 1852 * No rmdir "." please. 1853 */ 1854 if (nd.ni_dvp == vp) { 1855 error = EINVAL; 1856 goto out; 1857 } 1858 /* 1859 * The root of a mounted filesystem cannot be deleted. 1860 */ 1861 if (vp->v_flag & VROOT) 1862 error = EBUSY; 1863 out: 1864 if (!error) { 1865 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1866 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1867 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1868 } else { 1869 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1870 if (nd.ni_dvp == vp) 1871 vrele(nd.ni_dvp); 1872 else 1873 vput(nd.ni_dvp); 1874 vput(vp); 1875 } 1876 return (error); 1877 } 1878 1879 /* 1880 * Read a block of directory entries in a file system independent format. 1881 */ 1882 int 1883 sys_getdirentries(p, v, retval) 1884 struct proc *p; 1885 void *v; 1886 register_t *retval; 1887 { 1888 register struct sys_getdirentries_args /* { 1889 syscallarg(int) fd; 1890 syscallarg(char *) buf; 1891 syscallarg(u_int) count; 1892 syscallarg(long *) basep; 1893 } */ *uap = v; 1894 register struct vnode *vp; 1895 struct file *fp; 1896 struct uio auio; 1897 struct iovec aiov; 1898 long loff; 1899 int error, eofflag; 1900 1901 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1902 return (error); 1903 if ((fp->f_flag & FREAD) == 0) 1904 return (EBADF); 1905 vp = (struct vnode *)fp->f_data; 1906 unionread: 1907 if (vp->v_type != VDIR) 1908 return (EINVAL); 1909 aiov.iov_base = SCARG(uap, buf); 1910 aiov.iov_len = SCARG(uap, count); 1911 auio.uio_iov = &aiov; 1912 auio.uio_iovcnt = 1; 1913 auio.uio_rw = UIO_READ; 1914 auio.uio_segflg = UIO_USERSPACE; 1915 auio.uio_procp = p; 1916 auio.uio_resid = SCARG(uap, count); 1917 VOP_LOCK(vp); 1918 loff = auio.uio_offset = fp->f_offset; 1919 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, (u_long *)0, 0); 1920 fp->f_offset = auio.uio_offset; 1921 VOP_UNLOCK(vp); 1922 if (error) 1923 return (error); 1924 1925 #ifdef UNION 1926 { 1927 extern int (**union_vnodeop_p) __P((void *)); 1928 extern struct vnode *union_dircache __P((struct vnode *)); 1929 1930 if ((SCARG(uap, count) == auio.uio_resid) && 1931 (vp->v_op == union_vnodeop_p)) { 1932 struct vnode *lvp; 1933 1934 lvp = union_dircache(vp); 1935 if (lvp != NULLVP) { 1936 struct vattr va; 1937 1938 /* 1939 * If the directory is opaque, 1940 * then don't show lower entries 1941 */ 1942 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 1943 if (va.va_flags & OPAQUE) { 1944 vput(lvp); 1945 lvp = NULL; 1946 } 1947 } 1948 1949 if (lvp != NULLVP) { 1950 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 1951 VOP_UNLOCK(lvp); 1952 1953 if (error) { 1954 vrele(lvp); 1955 return (error); 1956 } 1957 fp->f_data = (caddr_t) lvp; 1958 fp->f_offset = 0; 1959 error = vn_close(vp, FREAD, fp->f_cred, p); 1960 if (error) 1961 return (error); 1962 vp = lvp; 1963 goto unionread; 1964 } 1965 } 1966 } 1967 #endif /* UNION */ 1968 1969 if ((SCARG(uap, count) == auio.uio_resid) && 1970 (vp->v_flag & VROOT) && 1971 (vp->v_mount->mnt_flag & MNT_UNION)) { 1972 struct vnode *tvp = vp; 1973 vp = vp->v_mount->mnt_vnodecovered; 1974 VREF(vp); 1975 fp->f_data = (caddr_t) vp; 1976 fp->f_offset = 0; 1977 vrele(tvp); 1978 goto unionread; 1979 } 1980 error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), 1981 sizeof(long)); 1982 *retval = SCARG(uap, count) - auio.uio_resid; 1983 return (error); 1984 } 1985 1986 /* 1987 * Set the mode mask for creation of filesystem nodes. 1988 */ 1989 int 1990 sys_umask(p, v, retval) 1991 struct proc *p; 1992 void *v; 1993 register_t *retval; 1994 { 1995 struct sys_umask_args /* { 1996 syscallarg(int) newmask; 1997 } */ *uap = v; 1998 register struct filedesc *fdp; 1999 2000 fdp = p->p_fd; 2001 *retval = fdp->fd_cmask; 2002 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2003 return (0); 2004 } 2005 2006 /* 2007 * Void all references to file by ripping underlying filesystem 2008 * away from vnode. 2009 */ 2010 /* ARGSUSED */ 2011 int 2012 sys_revoke(p, v, retval) 2013 struct proc *p; 2014 void *v; 2015 register_t *retval; 2016 { 2017 register struct sys_revoke_args /* { 2018 syscallarg(char *) path; 2019 } */ *uap = v; 2020 register struct vnode *vp; 2021 struct vattr vattr; 2022 int error; 2023 struct nameidata nd; 2024 2025 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2026 if ((error = namei(&nd)) != 0) 2027 return (error); 2028 vp = nd.ni_vp; 2029 if (vp->v_type != VCHR && vp->v_type != VBLK) { 2030 error = EINVAL; 2031 goto out; 2032 } 2033 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2034 goto out; 2035 if (p->p_ucred->cr_uid != vattr.va_uid && 2036 (error = suser(p->p_ucred, &p->p_acflag))) 2037 goto out; 2038 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2039 vgoneall(vp); 2040 out: 2041 vrele(vp); 2042 return (error); 2043 } 2044 2045 /* 2046 * Convert a user file descriptor to a kernel file entry. 2047 */ 2048 int 2049 getvnode(fdp, fd, fpp) 2050 struct filedesc *fdp; 2051 int fd; 2052 struct file **fpp; 2053 { 2054 struct vnode *vp; 2055 struct file *fp; 2056 2057 if ((u_int)fd >= fdp->fd_nfiles || 2058 (fp = fdp->fd_ofiles[fd]) == NULL) 2059 return (EBADF); 2060 if (fp->f_type != DTYPE_VNODE) 2061 return (EINVAL); 2062 vp = (struct vnode *)fp->f_data; 2063 if (vp->v_type == VBAD) 2064 return (EBADF); 2065 *fpp = fp; 2066 return (0); 2067 } 2068
Indexes created Fri Sep 26 20:09:58 GMT 2025