vfs_syscalls.c revision 1.1.1.3
1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)vfs_syscalls.c 8.41 (Berkeley) 6/15/95 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/namei.h> 44 #include <sys/filedesc.h> 45 #include <sys/kernel.h> 46 #include <sys/file.h> 47 #include <sys/stat.h> 48 #include <sys/vnode.h> 49 #include <sys/mount.h> 50 #include <sys/proc.h> 51 #include <sys/uio.h> 52 #include <sys/malloc.h> 53 #include <sys/dirent.h> 54 55 #include <sys/syscallargs.h> 56 57 #include <vm/vm.h> 58 #include <sys/sysctl.h> 59 60 static int change_dir __P((struct nameidata *ndp, struct proc *p)); 61 static void checkdirs __P((struct vnode *olddp)); 62 63 /* 64 * Virtual File System System Calls 65 */ 66 67 /* 68 * Mount a file system. 69 */ 70 /* ARGSUSED */ 71 int 72 mount(p, uap, retval) 73 struct proc *p; 74 register struct mount_args /* { 75 syscallarg(char *) type; 76 syscallarg(char *) path; 77 syscallarg(int) flags; 78 syscallarg(caddr_t) data; 79 } */ *uap; 80 register_t *retval; 81 { 82 struct vnode *vp; 83 struct mount *mp; 84 struct vfsconf *vfsp; 85 int error, flag; 86 struct vattr va; 87 u_long fstypenum; 88 struct nameidata nd; 89 char fstypename[MFSNAMELEN]; 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 if (vfs_busy(mp, LK_NOWAIT, 0, p)) { 138 vput(vp); 139 return (EBUSY); 140 } 141 VOP_UNLOCK(vp, 0, p); 142 goto update; 143 } 144 /* 145 * If the user is not root, ensure that they own the directory 146 * onto which we are attempting to mount. 147 */ 148 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) || 149 (va.va_uid != p->p_ucred->cr_uid && 150 (error = suser(p->p_ucred, &p->p_acflag)))) { 151 vput(vp); 152 return (error); 153 } 154 /* 155 * Do not allow NFS export by non-root users. Silently 156 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 157 */ 158 if (p->p_ucred->cr_uid != 0) { 159 if (SCARG(uap, flags) & MNT_EXPORTED) { 160 vput(vp); 161 return (EPERM); 162 } 163 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 164 } 165 if (error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) 166 return (error); 167 if (vp->v_type != VDIR) { 168 vput(vp); 169 return (ENOTDIR); 170 } 171 #ifdef COMPAT_43 172 /* 173 * Historically filesystem types were identified by number. If we 174 * get an integer for the filesystem type instead of a string, we 175 * check to see if it matches one of the historic filesystem types. 176 */ 177 fstypenum = (u_long)SCARG(uap, type); 178 if (fstypenum < maxvfsconf) { 179 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 180 if (vfsp->vfc_typenum == fstypenum) 181 break; 182 if (vfsp == NULL) { 183 vput(vp); 184 return (ENODEV); 185 } 186 strncpy(fstypename, vfsp->vfc_name, MFSNAMELEN); 187 } else 188 #endif /* COMPAT_43 */ 189 if (error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL)) { 190 vput(vp); 191 return (error); 192 } 193 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 194 if (!strcmp(vfsp->vfc_name, fstypename)) 195 break; 196 if (vfsp == NULL) { 197 vput(vp); 198 return (ENODEV); 199 } 200 if (vp->v_mountedhere != NULL) { 201 vput(vp); 202 return (EBUSY); 203 } 204 205 /* 206 * Allocate and initialize the filesystem. 207 */ 208 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 209 M_MOUNT, M_WAITOK); 210 bzero((char *)mp, (u_long)sizeof(struct mount)); 211 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 212 (void)vfs_busy(mp, LK_NOWAIT, 0, p); 213 mp->mnt_op = vfsp->vfc_vfsops; 214 mp->mnt_vfc = vfsp; 215 vfsp->vfc_refcount++; 216 mp->mnt_stat.f_type = vfsp->vfc_typenum; 217 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; 218 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 219 vp->v_mountedhere = mp; 220 mp->mnt_vnodecovered = vp; 221 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 222 update: 223 /* 224 * Set the mount level flags. 225 */ 226 if (SCARG(uap, flags) & MNT_RDONLY) 227 mp->mnt_flag |= MNT_RDONLY; 228 else if (mp->mnt_flag & MNT_RDONLY) 229 mp->mnt_flag |= MNT_WANTRDWR; 230 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 231 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC); 232 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 233 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC); 234 /* 235 * Mount the filesystem. 236 */ 237 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 238 if (mp->mnt_flag & MNT_UPDATE) { 239 vrele(vp); 240 if (mp->mnt_flag & MNT_WANTRDWR) 241 mp->mnt_flag &= ~MNT_RDONLY; 242 mp->mnt_flag &=~ 243 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 244 if (error) 245 mp->mnt_flag = flag; 246 vfs_unbusy(mp, p); 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 simple_lock(&mountlist_slock); 255 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 256 simple_unlock(&mountlist_slock); 257 checkdirs(vp); 258 VOP_UNLOCK(vp, 0, p); 259 vfs_unbusy(mp, p); 260 if (error = VFS_START(mp, 0, p)) 261 vrele(vp); 262 } else { 263 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 264 mp->mnt_vfc->vfc_refcount--; 265 vfs_unbusy(mp, p); 266 free((caddr_t)mp, M_MOUNT); 267 vput(vp); 268 } 269 return (error); 270 } 271 272 /* 273 * Scan all active processes to see if any of them have a current 274 * or root directory onto which the new filesystem has just been 275 * mounted. If so, replace them with the new mount point. 276 */ 277 static void 278 checkdirs(olddp) 279 struct vnode *olddp; 280 { 281 struct filedesc *fdp; 282 struct vnode *newdp; 283 struct proc *p; 284 285 if (olddp->v_usecount == 1) 286 return; 287 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 288 panic("mount: lost mount"); 289 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 290 fdp = p->p_fd; 291 if (fdp->fd_cdir == olddp) { 292 vrele(fdp->fd_cdir); 293 VREF(newdp); 294 fdp->fd_cdir = newdp; 295 } 296 if (fdp->fd_rdir == olddp) { 297 vrele(fdp->fd_rdir); 298 VREF(newdp); 299 fdp->fd_rdir = newdp; 300 } 301 } 302 if (rootvnode == olddp) { 303 vrele(rootvnode); 304 VREF(newdp); 305 rootvnode = newdp; 306 } 307 vput(newdp); 308 } 309 310 /* 311 * Unmount a file system. 312 * 313 * Note: unmount takes a path to the vnode mounted on as argument, 314 * not special file (as before). 315 */ 316 /* ARGSUSED */ 317 int 318 unmount(p, uap, retval) 319 struct proc *p; 320 register struct unmount_args /* { 321 syscallarg(char *) path; 322 syscallarg(int) flags; 323 } */ *uap; 324 register_t *retval; 325 { 326 register struct vnode *vp; 327 struct mount *mp; 328 int error; 329 struct nameidata nd; 330 331 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 332 SCARG(uap, path), p); 333 if (error = namei(&nd)) 334 return (error); 335 vp = nd.ni_vp; 336 mp = vp->v_mount; 337 338 /* 339 * Only root, or the user that did the original mount is 340 * permitted to unmount this filesystem. 341 */ 342 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 343 (error = suser(p->p_ucred, &p->p_acflag))) { 344 vput(vp); 345 return (error); 346 } 347 348 /* 349 * Don't allow unmounting the root file system. 350 */ 351 if (mp->mnt_flag & MNT_ROOTFS) { 352 vput(vp); 353 return (EINVAL); 354 } 355 356 /* 357 * Must be the root of the filesystem 358 */ 359 if ((vp->v_flag & VROOT) == 0) { 360 vput(vp); 361 return (EINVAL); 362 } 363 vput(vp); 364 return (dounmount(mp, SCARG(uap, flags), p)); 365 } 366 367 /* 368 * Do the actual file system unmount. 369 */ 370 int 371 dounmount(mp, flags, p) 372 register struct mount *mp; 373 int flags; 374 struct proc *p; 375 { 376 struct vnode *coveredvp; 377 int error; 378 379 simple_lock(&mountlist_slock); 380 mp->mnt_flag |= MNT_UNMOUNT; 381 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock, p); 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 (((mp->mnt_flag & MNT_RDONLY) || 386 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 387 (flags & MNT_FORCE)) 388 error = VFS_UNMOUNT(mp, flags, p); 389 simple_lock(&mountlist_slock); 390 if (error) { 391 mp->mnt_flag &= ~MNT_UNMOUNT; 392 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 393 &mountlist_slock, p); 394 return (error); 395 } 396 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 397 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 398 coveredvp->v_mountedhere = (struct mount *)0; 399 vrele(coveredvp); 400 } 401 mp->mnt_vfc->vfc_refcount--; 402 if (mp->mnt_vnodelist.lh_first != NULL) 403 panic("unmount: dangling vnode"); 404 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock, p); 405 if (mp->mnt_flag & MNT_MWAIT) 406 wakeup((caddr_t)mp); 407 free((caddr_t)mp, M_MOUNT); 408 return (0); 409 } 410 411 /* 412 * Sync each mounted filesystem. 413 */ 414 #ifdef DEBUG 415 int syncprt = 0; 416 struct ctldebug debug0 = { "syncprt", &syncprt }; 417 #endif 418 419 /* ARGSUSED */ 420 int 421 sync(p, uap, retval) 422 struct proc *p; 423 void *uap; 424 register_t *retval; 425 { 426 register struct mount *mp, *nmp; 427 int asyncflag; 428 429 simple_lock(&mountlist_slock); 430 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 431 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) { 432 nmp = mp->mnt_list.cqe_next; 433 continue; 434 } 435 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 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 simple_lock(&mountlist_slock); 443 nmp = mp->mnt_list.cqe_next; 444 vfs_unbusy(mp, p); 445 } 446 simple_unlock(&mountlist_slock); 447 #ifdef DIAGNOSTIC 448 if (syncprt) 449 vfs_bufstats(); 450 #endif /* DIAGNOSTIC */ 451 return (0); 452 } 453 454 /* 455 * Change filesystem quotas. 456 */ 457 /* ARGSUSED */ 458 int 459 quotactl(p, uap, retval) 460 struct proc *p; 461 register struct quotactl_args /* { 462 syscallarg(char *) path; 463 syscallarg(int) cmd; 464 syscallarg(int) uid; 465 syscallarg(caddr_t) arg; 466 } */ *uap; 467 register_t *retval; 468 { 469 register struct mount *mp; 470 int error; 471 struct nameidata nd; 472 473 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 474 if (error = namei(&nd)) 475 return (error); 476 mp = nd.ni_vp->v_mount; 477 vrele(nd.ni_vp); 478 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 479 SCARG(uap, arg), p)); 480 } 481 482 /* 483 * Get filesystem statistics. 484 */ 485 /* ARGSUSED */ 486 int 487 statfs(p, uap, retval) 488 struct proc *p; 489 register struct statfs_args /* { 490 syscallarg(char *) path; 491 syscallarg(struct statfs *) buf; 492 } */ *uap; 493 register_t *retval; 494 { 495 register struct mount *mp; 496 register struct statfs *sp; 497 int error; 498 struct nameidata nd; 499 500 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 501 if (error = namei(&nd)) 502 return (error); 503 mp = nd.ni_vp->v_mount; 504 sp = &mp->mnt_stat; 505 vrele(nd.ni_vp); 506 if (error = VFS_STATFS(mp, sp, p)) 507 return (error); 508 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 509 return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); 510 } 511 512 /* 513 * Get filesystem statistics. 514 */ 515 /* ARGSUSED */ 516 int 517 fstatfs(p, uap, retval) 518 struct proc *p; 519 register struct fstatfs_args /* { 520 syscallarg(int) fd; 521 syscallarg(struct statfs *) buf; 522 } */ *uap; 523 register_t *retval; 524 { 525 struct file *fp; 526 struct mount *mp; 527 register struct statfs *sp; 528 int error; 529 530 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 531 return (error); 532 mp = ((struct vnode *)fp->f_data)->v_mount; 533 sp = &mp->mnt_stat; 534 if (error = VFS_STATFS(mp, sp, p)) 535 return (error); 536 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 537 return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); 538 } 539 540 /* 541 * Get statistics on all filesystems. 542 */ 543 int 544 getfsstat(p, uap, retval) 545 struct proc *p; 546 register struct getfsstat_args /* { 547 syscallarg(struct statfs *) buf; 548 syscallarg(long) bufsize; 549 syscallarg(int) flags; 550 } */ *uap; 551 register_t *retval; 552 { 553 register struct mount *mp, *nmp; 554 register struct statfs *sp; 555 caddr_t sfsp; 556 long count, maxcount, error; 557 558 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 559 sfsp = (caddr_t)SCARG(uap, buf); 560 count = 0; 561 simple_lock(&mountlist_slock); 562 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 563 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) { 564 nmp = mp->mnt_list.cqe_next; 565 continue; 566 } 567 if (sfsp && count < maxcount) { 568 sp = &mp->mnt_stat; 569 /* 570 * If MNT_NOWAIT is specified, do not refresh the 571 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 572 */ 573 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 574 (SCARG(uap, flags) & MNT_WAIT)) && 575 (error = VFS_STATFS(mp, sp, p))) { 576 simple_lock(&mountlist_slock); 577 nmp = mp->mnt_list.cqe_next; 578 vfs_unbusy(mp, p); 579 continue; 580 } 581 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 582 if (error = copyout((caddr_t)sp, sfsp, sizeof(*sp))) 583 return (error); 584 sfsp += sizeof(*sp); 585 } 586 count++; 587 simple_lock(&mountlist_slock); 588 nmp = mp->mnt_list.cqe_next; 589 vfs_unbusy(mp, p); 590 } 591 simple_unlock(&mountlist_slock); 592 if (sfsp && count > maxcount) 593 *retval = maxcount; 594 else 595 *retval = count; 596 return (0); 597 } 598 599 /* 600 * Change current working directory to a given file descriptor. 601 */ 602 /* ARGSUSED */ 603 int 604 fchdir(p, uap, retval) 605 struct proc *p; 606 struct fchdir_args /* { 607 syscallarg(int) fd; 608 } */ *uap; 609 register_t *retval; 610 { 611 register struct filedesc *fdp = p->p_fd; 612 struct vnode *vp, *tdp; 613 struct mount *mp; 614 struct file *fp; 615 int error; 616 617 if (error = getvnode(fdp, SCARG(uap, fd), &fp)) 618 return (error); 619 vp = (struct vnode *)fp->f_data; 620 VREF(vp); 621 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 622 if (vp->v_type != VDIR) 623 error = ENOTDIR; 624 else 625 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 626 while (!error && (mp = vp->v_mountedhere) != NULL) { 627 if (vfs_busy(mp, 0, 0, p)) 628 continue; 629 error = VFS_ROOT(mp, &tdp); 630 vfs_unbusy(mp, p); 631 if (error) 632 break; 633 vput(vp); 634 vp = tdp; 635 } 636 if (error) { 637 vput(vp); 638 return (error); 639 } 640 VOP_UNLOCK(vp, 0, p); 641 vrele(fdp->fd_cdir); 642 fdp->fd_cdir = vp; 643 return (0); 644 } 645 646 /* 647 * Change current working directory (``.''). 648 */ 649 /* ARGSUSED */ 650 int 651 chdir(p, uap, retval) 652 struct proc *p; 653 struct chdir_args /* { 654 syscallarg(char *) path; 655 } */ *uap; 656 register_t *retval; 657 { 658 register struct filedesc *fdp = p->p_fd; 659 int error; 660 struct nameidata nd; 661 662 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 663 SCARG(uap, path), p); 664 if (error = change_dir(&nd, p)) 665 return (error); 666 vrele(fdp->fd_cdir); 667 fdp->fd_cdir = nd.ni_vp; 668 return (0); 669 } 670 671 /* 672 * Change notion of root (``/'') directory. 673 */ 674 /* ARGSUSED */ 675 int 676 chroot(p, uap, retval) 677 struct proc *p; 678 struct chroot_args /* { 679 syscallarg(char *) path; 680 } */ *uap; 681 register_t *retval; 682 { 683 register struct filedesc *fdp = p->p_fd; 684 int error; 685 struct nameidata nd; 686 687 if (error = suser(p->p_ucred, &p->p_acflag)) 688 return (error); 689 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 690 SCARG(uap, path), p); 691 if (error = change_dir(&nd, p)) 692 return (error); 693 if (fdp->fd_rdir != NULL) 694 vrele(fdp->fd_rdir); 695 fdp->fd_rdir = nd.ni_vp; 696 return (0); 697 } 698 699 /* 700 * Common routine for chroot and chdir. 701 */ 702 static int 703 change_dir(ndp, p) 704 register struct nameidata *ndp; 705 struct proc *p; 706 { 707 struct vnode *vp; 708 int error; 709 710 if (error = namei(ndp)) 711 return (error); 712 vp = ndp->ni_vp; 713 if (vp->v_type != VDIR) 714 error = ENOTDIR; 715 else 716 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 717 if (error) 718 vput(vp); 719 else 720 VOP_UNLOCK(vp, 0, p); 721 return (error); 722 } 723 724 /* 725 * Check permissions, allocate an open file structure, 726 * and call the device open routine if any. 727 */ 728 int 729 open(p, uap, retval) 730 struct proc *p; 731 register struct open_args /* { 732 syscallarg(char *) path; 733 syscallarg(int) flags; 734 syscallarg(int) mode; 735 } */ *uap; 736 register_t *retval; 737 { 738 register struct filedesc *fdp = p->p_fd; 739 register struct file *fp; 740 register struct vnode *vp; 741 int flags, cmode; 742 struct file *nfp; 743 int type, indx, error; 744 struct flock lf; 745 struct nameidata nd; 746 extern struct fileops vnops; 747 748 if (error = falloc(p, &nfp, &indx)) 749 return (error); 750 fp = nfp; 751 flags = FFLAGS(SCARG(uap, flags)); 752 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 753 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 754 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 755 if (error = vn_open(&nd, flags, cmode)) { 756 ffree(fp); 757 if ((error == ENODEV || error == ENXIO) && 758 p->p_dupfd >= 0 && /* XXX from fdopen */ 759 (error = 760 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 761 *retval = indx; 762 return (0); 763 } 764 if (error == ERESTART) 765 error = EINTR; 766 fdp->fd_ofiles[indx] = NULL; 767 return (error); 768 } 769 p->p_dupfd = 0; 770 vp = nd.ni_vp; 771 fp->f_flag = flags & FMASK; 772 fp->f_type = DTYPE_VNODE; 773 fp->f_ops = &vnops; 774 fp->f_data = (caddr_t)vp; 775 if (flags & (O_EXLOCK | O_SHLOCK)) { 776 lf.l_whence = SEEK_SET; 777 lf.l_start = 0; 778 lf.l_len = 0; 779 if (flags & O_EXLOCK) 780 lf.l_type = F_WRLCK; 781 else 782 lf.l_type = F_RDLCK; 783 type = F_FLOCK; 784 if ((flags & FNONBLOCK) == 0) 785 type |= F_WAIT; 786 VOP_UNLOCK(vp, 0, p); 787 if (error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) { 788 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 789 ffree(fp); 790 fdp->fd_ofiles[indx] = NULL; 791 return (error); 792 } 793 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 794 fp->f_flag |= FHASLOCK; 795 } 796 VOP_UNLOCK(vp, 0, p); 797 *retval = indx; 798 return (0); 799 } 800 801 #ifdef COMPAT_43 802 /* 803 * Create a file. 804 */ 805 int 806 compat_43_creat(p, uap, retval) 807 struct proc *p; 808 register struct compat_43_creat_args /* { 809 syscallarg(char *) path; 810 syscallarg(int) mode; 811 } */ *uap; 812 register_t *retval; 813 { 814 struct open_args /* { 815 syscallarg(char *) path; 816 syscallarg(int) flags; 817 syscallarg(int) mode; 818 } */ nuap; 819 820 SCARG(&nuap, path) = SCARG(uap, path); 821 SCARG(&nuap, mode) = SCARG(uap, mode); 822 SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC; 823 return (open(p, &nuap, retval)); 824 } 825 #endif /* COMPAT_43 */ 826 827 /* 828 * Create a special file. 829 */ 830 /* ARGSUSED */ 831 int 832 mknod(p, uap, retval) 833 struct proc *p; 834 register struct mknod_args /* { 835 syscallarg(char *) path; 836 syscallarg(int) mode; 837 syscallarg(int) dev; 838 } */ *uap; 839 register_t *retval; 840 { 841 register struct vnode *vp; 842 struct vattr vattr; 843 int error; 844 int whiteout; 845 struct nameidata nd; 846 847 if (error = suser(p->p_ucred, &p->p_acflag)) 848 return (error); 849 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 850 if (error = namei(&nd)) 851 return (error); 852 vp = nd.ni_vp; 853 if (vp != NULL) 854 error = EEXIST; 855 else { 856 VATTR_NULL(&vattr); 857 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 858 vattr.va_rdev = SCARG(uap, dev); 859 whiteout = 0; 860 861 switch (SCARG(uap, mode) & S_IFMT) { 862 case S_IFMT: /* used by badsect to flag bad sectors */ 863 vattr.va_type = VBAD; 864 break; 865 case S_IFCHR: 866 vattr.va_type = VCHR; 867 break; 868 case S_IFBLK: 869 vattr.va_type = VBLK; 870 break; 871 case S_IFWHT: 872 whiteout = 1; 873 break; 874 default: 875 error = EINVAL; 876 break; 877 } 878 } 879 if (!error) { 880 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 881 if (whiteout) { 882 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 883 if (error) 884 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 885 vput(nd.ni_dvp); 886 } else { 887 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 888 &nd.ni_cnd, &vattr); 889 } 890 } else { 891 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 892 if (nd.ni_dvp == vp) 893 vrele(nd.ni_dvp); 894 else 895 vput(nd.ni_dvp); 896 if (vp) 897 vrele(vp); 898 } 899 return (error); 900 } 901 902 /* 903 * Create a named pipe. 904 */ 905 /* ARGSUSED */ 906 int 907 mkfifo(p, uap, retval) 908 struct proc *p; 909 register struct mkfifo_args /* { 910 syscallarg(char *) path; 911 syscallarg(int) mode; 912 } */ *uap; 913 register_t *retval; 914 { 915 struct vattr vattr; 916 int error; 917 struct nameidata nd; 918 919 #ifndef FIFO 920 return (EOPNOTSUPP); 921 #else 922 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 923 if (error = namei(&nd)) 924 return (error); 925 if (nd.ni_vp != NULL) { 926 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 927 if (nd.ni_dvp == nd.ni_vp) 928 vrele(nd.ni_dvp); 929 else 930 vput(nd.ni_dvp); 931 vrele(nd.ni_vp); 932 return (EEXIST); 933 } 934 VATTR_NULL(&vattr); 935 vattr.va_type = VFIFO; 936 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 937 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 938 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 939 #endif /* FIFO */ 940 } 941 942 /* 943 * Make a hard file link. 944 */ 945 /* ARGSUSED */ 946 int 947 link(p, uap, retval) 948 struct proc *p; 949 register struct link_args /* { 950 syscallarg(char *) path; 951 syscallarg(char *) link; 952 } */ *uap; 953 register_t *retval; 954 { 955 register struct vnode *vp; 956 struct nameidata nd; 957 int error; 958 959 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 960 if (error = namei(&nd)) 961 return (error); 962 vp = nd.ni_vp; 963 if (vp->v_type != VDIR || 964 (error = suser(p->p_ucred, &p->p_acflag)) == 0) { 965 nd.ni_cnd.cn_nameiop = CREATE; 966 nd.ni_cnd.cn_flags = LOCKPARENT; 967 nd.ni_dirp = SCARG(uap, link); 968 if ((error = namei(&nd)) == 0) { 969 if (nd.ni_vp != NULL) 970 error = EEXIST; 971 if (!error) { 972 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, 973 LEASE_WRITE); 974 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 975 error = VOP_LINK(vp, nd.ni_dvp, &nd.ni_cnd); 976 } else { 977 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 978 if (nd.ni_dvp == nd.ni_vp) 979 vrele(nd.ni_dvp); 980 else 981 vput(nd.ni_dvp); 982 if (nd.ni_vp) 983 vrele(nd.ni_vp); 984 } 985 } 986 } 987 vrele(vp); 988 return (error); 989 } 990 991 /* 992 * Make a symbolic link. 993 */ 994 /* ARGSUSED */ 995 int 996 symlink(p, uap, retval) 997 struct proc *p; 998 register struct symlink_args /* { 999 syscallarg(char *) path; 1000 syscallarg(char *) link; 1001 } */ *uap; 1002 register_t *retval; 1003 { 1004 struct vattr vattr; 1005 char *path; 1006 int error; 1007 struct nameidata nd; 1008 1009 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1010 if (error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL)) 1011 goto out; 1012 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1013 if (error = namei(&nd)) 1014 goto out; 1015 if (nd.ni_vp) { 1016 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1017 if (nd.ni_dvp == nd.ni_vp) 1018 vrele(nd.ni_dvp); 1019 else 1020 vput(nd.ni_dvp); 1021 vrele(nd.ni_vp); 1022 error = EEXIST; 1023 goto out; 1024 } 1025 VATTR_NULL(&vattr); 1026 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1027 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1028 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1029 out: 1030 FREE(path, M_NAMEI); 1031 return (error); 1032 } 1033 1034 /* 1035 * Delete a whiteout from the filesystem. 1036 */ 1037 /* ARGSUSED */ 1038 int 1039 undelete(p, uap, retval) 1040 struct proc *p; 1041 register struct undelete_args /* { 1042 syscallarg(char *) path; 1043 } */ *uap; 1044 register_t *retval; 1045 { 1046 int error; 1047 struct nameidata nd; 1048 1049 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1050 SCARG(uap, path), p); 1051 error = namei(&nd); 1052 if (error) 1053 return (error); 1054 1055 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1056 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1057 if (nd.ni_dvp == nd.ni_vp) 1058 vrele(nd.ni_dvp); 1059 else 1060 vput(nd.ni_dvp); 1061 if (nd.ni_vp) 1062 vrele(nd.ni_vp); 1063 return (EEXIST); 1064 } 1065 1066 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1067 if (error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) 1068 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1069 vput(nd.ni_dvp); 1070 return (error); 1071 } 1072 1073 /* 1074 * Delete a name from the filesystem. 1075 */ 1076 /* ARGSUSED */ 1077 int 1078 unlink(p, uap, retval) 1079 struct proc *p; 1080 struct unlink_args /* { 1081 syscallarg(char *) path; 1082 } */ *uap; 1083 register_t *retval; 1084 { 1085 register struct vnode *vp; 1086 int error; 1087 struct nameidata nd; 1088 1089 NDINIT(&nd, DELETE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1090 if (error = namei(&nd)) 1091 return (error); 1092 vp = nd.ni_vp; 1093 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1094 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 1095 1096 if (vp->v_type != VDIR || 1097 (error = suser(p->p_ucred, &p->p_acflag)) == 0) { 1098 /* 1099 * The root of a mounted filesystem cannot be deleted. 1100 */ 1101 if (vp->v_flag & VROOT) 1102 error = EBUSY; 1103 else 1104 (void)vnode_pager_uncache(vp); 1105 } 1106 1107 if (!error) { 1108 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1109 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1110 } else { 1111 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1112 if (nd.ni_dvp == vp) 1113 vrele(nd.ni_dvp); 1114 else 1115 vput(nd.ni_dvp); 1116 if (vp != NULLVP) 1117 vput(vp); 1118 } 1119 return (error); 1120 } 1121 1122 /* 1123 * Reposition read/write file offset. 1124 */ 1125 int 1126 lseek(p, uap, retval) 1127 struct proc *p; 1128 register struct lseek_args /* { 1129 syscallarg(int) fd; 1130 syscallarg(int) pad; 1131 syscallarg(off_t) offset; 1132 syscallarg(int) whence; 1133 } */ *uap; 1134 register_t *retval; 1135 { 1136 struct ucred *cred = p->p_ucred; 1137 register struct filedesc *fdp = p->p_fd; 1138 register struct file *fp; 1139 struct vattr vattr; 1140 int error; 1141 1142 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1143 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1144 return (EBADF); 1145 if (fp->f_type != DTYPE_VNODE) 1146 return (ESPIPE); 1147 switch (SCARG(uap, whence)) { 1148 case L_INCR: 1149 fp->f_offset += SCARG(uap, offset); 1150 break; 1151 case L_XTND: 1152 if (error = 1153 VOP_GETATTR((struct vnode *)fp->f_data, &vattr, cred, p)) 1154 return (error); 1155 fp->f_offset = SCARG(uap, offset) + vattr.va_size; 1156 break; 1157 case L_SET: 1158 fp->f_offset = SCARG(uap, offset); 1159 break; 1160 default: 1161 return (EINVAL); 1162 } 1163 *(off_t *)retval = fp->f_offset; 1164 return (0); 1165 } 1166 1167 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1168 /* 1169 * Reposition read/write file offset. 1170 */ 1171 int 1172 compat_43_lseek(p, uap, retval) 1173 struct proc *p; 1174 register struct compat_43_lseek_args /* { 1175 syscallarg(int) fd; 1176 syscallarg(long) offset; 1177 syscallarg(int) whence; 1178 } */ *uap; 1179 register_t *retval; 1180 { 1181 struct lseek_args /* { 1182 syscallarg(int) fd; 1183 syscallarg(int) pad; 1184 syscallarg(off_t) offset; 1185 syscallarg(int) whence; 1186 } */ nuap; 1187 off_t qret; 1188 int error; 1189 1190 SCARG(&nuap, fd) = SCARG(uap, fd); 1191 SCARG(&nuap, offset) = SCARG(uap, offset); 1192 SCARG(&nuap, whence) = SCARG(uap, whence); 1193 error = lseek(p, &nuap, &qret); 1194 *(long *)retval = qret; 1195 return (error); 1196 } 1197 #endif /* COMPAT_43 */ 1198 1199 /* 1200 * Check access permissions. 1201 */ 1202 int 1203 access(p, uap, retval) 1204 struct proc *p; 1205 register struct access_args /* { 1206 syscallarg(char *) path; 1207 syscallarg(int) flags; 1208 } */ *uap; 1209 register_t *retval; 1210 { 1211 register struct ucred *cred = p->p_ucred; 1212 register struct vnode *vp; 1213 int error, flags, t_gid, t_uid; 1214 struct nameidata nd; 1215 1216 t_uid = cred->cr_uid; 1217 t_gid = cred->cr_groups[0]; 1218 cred->cr_uid = p->p_cred->p_ruid; 1219 cred->cr_groups[0] = p->p_cred->p_rgid; 1220 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1221 SCARG(uap, path), p); 1222 if (error = namei(&nd)) 1223 goto out1; 1224 vp = nd.ni_vp; 1225 1226 /* Flags == 0 means only check for existence. */ 1227 if (SCARG(uap, flags)) { 1228 flags = 0; 1229 if (SCARG(uap, flags) & R_OK) 1230 flags |= VREAD; 1231 if (SCARG(uap, flags) & W_OK) 1232 flags |= VWRITE; 1233 if (SCARG(uap, flags) & X_OK) 1234 flags |= VEXEC; 1235 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1236 error = VOP_ACCESS(vp, flags, cred, p); 1237 } 1238 vput(vp); 1239 out1: 1240 cred->cr_uid = t_uid; 1241 cred->cr_groups[0] = t_gid; 1242 return (error); 1243 } 1244 1245 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1246 /* 1247 * Get file status; this version follows links. 1248 */ 1249 /* ARGSUSED */ 1250 int 1251 compat_43_stat(p, uap, retval) 1252 struct proc *p; 1253 register struct compat_43_stat_args /* { 1254 syscallarg(char *) path; 1255 syscallarg(struct ostat *) ub; 1256 } */ *uap; 1257 register_t *retval; 1258 { 1259 struct stat sb; 1260 struct ostat osb; 1261 int error; 1262 struct nameidata nd; 1263 1264 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1265 SCARG(uap, path), p); 1266 if (error = namei(&nd)) 1267 return (error); 1268 error = vn_stat(nd.ni_vp, &sb, p); 1269 vput(nd.ni_vp); 1270 if (error) 1271 return (error); 1272 cvtstat(&sb, &osb); 1273 error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb)); 1274 return (error); 1275 } 1276 1277 /* 1278 * Get file status; this version does not follow links. 1279 */ 1280 /* ARGSUSED */ 1281 int 1282 compat_43_lstat(p, uap, retval) 1283 struct proc *p; 1284 register struct compat_43_lstat_args /* { 1285 syscallarg(char *) path; 1286 syscallarg(struct ostat *) ub; 1287 } */ *uap; 1288 register_t *retval; 1289 { 1290 struct vnode *vp, *dvp; 1291 struct stat sb, sb1; 1292 struct ostat osb; 1293 int error; 1294 struct nameidata nd; 1295 1296 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | LOCKPARENT, UIO_USERSPACE, 1297 SCARG(uap, path), p); 1298 if (error = namei(&nd)) 1299 return (error); 1300 /* 1301 * For symbolic links, always return the attributes of its 1302 * containing directory, except for mode, size, and links. 1303 */ 1304 vp = nd.ni_vp; 1305 dvp = nd.ni_dvp; 1306 if (vp->v_type != VLNK) { 1307 if (dvp == vp) 1308 vrele(dvp); 1309 else 1310 vput(dvp); 1311 error = vn_stat(vp, &sb, p); 1312 vput(vp); 1313 if (error) 1314 return (error); 1315 } else { 1316 error = vn_stat(dvp, &sb, p); 1317 vput(dvp); 1318 if (error) { 1319 vput(vp); 1320 return (error); 1321 } 1322 error = vn_stat(vp, &sb1, p); 1323 vput(vp); 1324 if (error) 1325 return (error); 1326 sb.st_mode &= ~S_IFDIR; 1327 sb.st_mode |= S_IFLNK; 1328 sb.st_nlink = sb1.st_nlink; 1329 sb.st_size = sb1.st_size; 1330 sb.st_blocks = sb1.st_blocks; 1331 } 1332 cvtstat(&sb, &osb); 1333 error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb)); 1334 return (error); 1335 } 1336 1337 /* 1338 * Convert from an old to a new stat structure. 1339 */ 1340 void 1341 cvtstat(st, ost) 1342 struct stat *st; 1343 struct ostat *ost; 1344 { 1345 1346 ost->st_dev = st->st_dev; 1347 ost->st_ino = st->st_ino; 1348 ost->st_mode = st->st_mode; 1349 ost->st_nlink = st->st_nlink; 1350 ost->st_uid = st->st_uid; 1351 ost->st_gid = st->st_gid; 1352 ost->st_rdev = st->st_rdev; 1353 if (st->st_size < (quad_t)1 << 32) 1354 ost->st_size = st->st_size; 1355 else 1356 ost->st_size = -2; 1357 ost->st_atime = st->st_atime; 1358 ost->st_mtime = st->st_mtime; 1359 ost->st_ctime = st->st_ctime; 1360 ost->st_blksize = st->st_blksize; 1361 ost->st_blocks = st->st_blocks; 1362 ost->st_flags = st->st_flags; 1363 ost->st_gen = st->st_gen; 1364 } 1365 #endif /* COMPAT_43 || COMPAT_SUNOS */ 1366 1367 /* 1368 * Get file status; this version follows links. 1369 */ 1370 /* ARGSUSED */ 1371 int 1372 stat(p, uap, retval) 1373 struct proc *p; 1374 register struct stat_args /* { 1375 syscallarg(char *) path; 1376 syscallarg(struct stat *) ub; 1377 } */ *uap; 1378 register_t *retval; 1379 { 1380 struct stat sb; 1381 int error; 1382 struct nameidata nd; 1383 1384 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1385 SCARG(uap, path), p); 1386 if (error = namei(&nd)) 1387 return (error); 1388 error = vn_stat(nd.ni_vp, &sb, p); 1389 vput(nd.ni_vp); 1390 if (error) 1391 return (error); 1392 error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); 1393 return (error); 1394 } 1395 1396 /* 1397 * Get file status; this version does not follow links. 1398 */ 1399 /* ARGSUSED */ 1400 int 1401 lstat(p, uap, retval) 1402 struct proc *p; 1403 register struct lstat_args /* { 1404 syscallarg(char *) path; 1405 syscallarg(struct stat *) ub; 1406 } */ *uap; 1407 register_t *retval; 1408 { 1409 int error; 1410 struct vnode *vp, *dvp; 1411 struct stat sb, sb1; 1412 struct nameidata nd; 1413 1414 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | LOCKPARENT, UIO_USERSPACE, 1415 SCARG(uap, path), p); 1416 if (error = namei(&nd)) 1417 return (error); 1418 /* 1419 * For symbolic links, always return the attributes of its containing 1420 * directory, except for mode, size, inode number, and links. 1421 */ 1422 vp = nd.ni_vp; 1423 dvp = nd.ni_dvp; 1424 if (vp->v_type != VLNK) { 1425 if (dvp == vp) 1426 vrele(dvp); 1427 else 1428 vput(dvp); 1429 error = vn_stat(vp, &sb, p); 1430 vput(vp); 1431 if (error) 1432 return (error); 1433 } else { 1434 error = vn_stat(dvp, &sb, p); 1435 vput(dvp); 1436 if (error) { 1437 vput(vp); 1438 return (error); 1439 } 1440 error = vn_stat(vp, &sb1, p); 1441 vput(vp); 1442 if (error) 1443 return (error); 1444 sb.st_mode &= ~S_IFDIR; 1445 sb.st_mode |= S_IFLNK; 1446 sb.st_nlink = sb1.st_nlink; 1447 sb.st_size = sb1.st_size; 1448 sb.st_blocks = sb1.st_blocks; 1449 sb.st_ino = sb1.st_ino; 1450 } 1451 error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); 1452 return (error); 1453 } 1454 1455 /* 1456 * Get configurable pathname variables. 1457 */ 1458 /* ARGSUSED */ 1459 int 1460 pathconf(p, uap, retval) 1461 struct proc *p; 1462 register struct pathconf_args /* { 1463 syscallarg(char *) path; 1464 syscallarg(int) name; 1465 } */ *uap; 1466 register_t *retval; 1467 { 1468 int error; 1469 struct nameidata nd; 1470 1471 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1472 SCARG(uap, path), p); 1473 if (error = namei(&nd)) 1474 return (error); 1475 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1476 vput(nd.ni_vp); 1477 return (error); 1478 } 1479 1480 /* 1481 * Return target name of a symbolic link. 1482 */ 1483 /* ARGSUSED */ 1484 int 1485 readlink(p, uap, retval) 1486 struct proc *p; 1487 register struct readlink_args /* { 1488 syscallarg(char *) path; 1489 syscallarg(char *) buf; 1490 syscallarg(int) count; 1491 } */ *uap; 1492 register_t *retval; 1493 { 1494 register struct vnode *vp; 1495 struct iovec aiov; 1496 struct uio auio; 1497 int error; 1498 struct nameidata nd; 1499 1500 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1501 SCARG(uap, path), p); 1502 if (error = namei(&nd)) 1503 return (error); 1504 vp = nd.ni_vp; 1505 if (vp->v_type != VLNK) 1506 error = EINVAL; 1507 else { 1508 aiov.iov_base = SCARG(uap, buf); 1509 aiov.iov_len = SCARG(uap, count); 1510 auio.uio_iov = &aiov; 1511 auio.uio_iovcnt = 1; 1512 auio.uio_offset = 0; 1513 auio.uio_rw = UIO_READ; 1514 auio.uio_segflg = UIO_USERSPACE; 1515 auio.uio_procp = p; 1516 auio.uio_resid = SCARG(uap, count); 1517 error = VOP_READLINK(vp, &auio, p->p_ucred); 1518 } 1519 vput(vp); 1520 *retval = SCARG(uap, count) - auio.uio_resid; 1521 return (error); 1522 } 1523 1524 /* 1525 * Change flags of a file given a path name. 1526 */ 1527 /* ARGSUSED */ 1528 int 1529 chflags(p, uap, retval) 1530 struct proc *p; 1531 register struct chflags_args /* { 1532 syscallarg(char *) path; 1533 syscallarg(int) flags; 1534 } */ *uap; 1535 register_t *retval; 1536 { 1537 register struct vnode *vp; 1538 struct vattr vattr; 1539 int error; 1540 struct nameidata nd; 1541 1542 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1543 if (error = namei(&nd)) 1544 return (error); 1545 vp = nd.ni_vp; 1546 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1547 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 1548 VATTR_NULL(&vattr); 1549 vattr.va_flags = SCARG(uap, flags); 1550 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1551 vput(vp); 1552 return (error); 1553 } 1554 1555 /* 1556 * Change flags of a file given a file descriptor. 1557 */ 1558 /* ARGSUSED */ 1559 int 1560 fchflags(p, uap, retval) 1561 struct proc *p; 1562 register struct fchflags_args /* { 1563 syscallarg(int) fd; 1564 syscallarg(int) flags; 1565 } */ *uap; 1566 register_t *retval; 1567 { 1568 struct vattr vattr; 1569 struct vnode *vp; 1570 struct file *fp; 1571 int error; 1572 1573 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1574 return (error); 1575 vp = (struct vnode *)fp->f_data; 1576 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1577 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 1578 VATTR_NULL(&vattr); 1579 vattr.va_flags = SCARG(uap, flags); 1580 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1581 VOP_UNLOCK(vp, 0, p); 1582 return (error); 1583 } 1584 1585 /* 1586 * Change mode of a file given path name. 1587 */ 1588 /* ARGSUSED */ 1589 int 1590 chmod(p, uap, retval) 1591 struct proc *p; 1592 register struct chmod_args /* { 1593 syscallarg(char *) path; 1594 syscallarg(int) mode; 1595 } */ *uap; 1596 register_t *retval; 1597 { 1598 register struct vnode *vp; 1599 struct vattr vattr; 1600 int error; 1601 struct nameidata nd; 1602 1603 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1604 if (error = namei(&nd)) 1605 return (error); 1606 vp = nd.ni_vp; 1607 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1608 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 1609 VATTR_NULL(&vattr); 1610 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1611 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1612 vput(vp); 1613 return (error); 1614 } 1615 1616 /* 1617 * Change mode of a file given a file descriptor. 1618 */ 1619 /* ARGSUSED */ 1620 int 1621 fchmod(p, uap, retval) 1622 struct proc *p; 1623 register struct fchmod_args /* { 1624 syscallarg(int) fd; 1625 syscallarg(int) mode; 1626 } */ *uap; 1627 register_t *retval; 1628 { 1629 struct vattr vattr; 1630 struct vnode *vp; 1631 struct file *fp; 1632 int error; 1633 1634 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1635 return (error); 1636 vp = (struct vnode *)fp->f_data; 1637 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1638 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 1639 VATTR_NULL(&vattr); 1640 vattr.va_mode = SCARG(uap, mode) & ALLPERMS; 1641 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1642 VOP_UNLOCK(vp, 0, p); 1643 return (error); 1644 } 1645 1646 /* 1647 * Set ownership given a path name. 1648 */ 1649 /* ARGSUSED */ 1650 int 1651 chown(p, uap, retval) 1652 struct proc *p; 1653 register struct chown_args /* { 1654 syscallarg(char *) path; 1655 syscallarg(int) uid; 1656 syscallarg(int) gid; 1657 } */ *uap; 1658 register_t *retval; 1659 { 1660 register struct vnode *vp; 1661 struct vattr vattr; 1662 int error; 1663 struct nameidata nd; 1664 1665 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1666 if (error = namei(&nd)) 1667 return (error); 1668 vp = nd.ni_vp; 1669 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1670 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 1671 VATTR_NULL(&vattr); 1672 vattr.va_uid = SCARG(uap, uid); 1673 vattr.va_gid = SCARG(uap, gid); 1674 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1675 vput(vp); 1676 return (error); 1677 } 1678 1679 /* 1680 * Set ownership given a file descriptor. 1681 */ 1682 /* ARGSUSED */ 1683 int 1684 fchown(p, uap, retval) 1685 struct proc *p; 1686 register struct fchown_args /* { 1687 syscallarg(int) fd; 1688 syscallarg(int) uid; 1689 syscallarg(int) gid; 1690 } */ *uap; 1691 register_t *retval; 1692 { 1693 struct vattr vattr; 1694 struct vnode *vp; 1695 struct file *fp; 1696 int error; 1697 1698 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1699 return (error); 1700 vp = (struct vnode *)fp->f_data; 1701 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1702 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 1703 VATTR_NULL(&vattr); 1704 vattr.va_uid = SCARG(uap, uid); 1705 vattr.va_gid = SCARG(uap, gid); 1706 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1707 VOP_UNLOCK(vp, 0, p); 1708 return (error); 1709 } 1710 1711 /* 1712 * Set the access and modification times of a file. 1713 */ 1714 /* ARGSUSED */ 1715 int 1716 utimes(p, uap, retval) 1717 struct proc *p; 1718 register struct utimes_args /* { 1719 syscallarg(char *) path; 1720 syscallarg(struct timeval *) tptr; 1721 } */ *uap; 1722 register_t *retval; 1723 { 1724 register struct vnode *vp; 1725 struct timeval tv[2]; 1726 struct vattr vattr; 1727 int error; 1728 struct nameidata nd; 1729 1730 VATTR_NULL(&vattr); 1731 if (SCARG(uap, tptr) == NULL) { 1732 microtime(&tv[0]); 1733 tv[1] = tv[0]; 1734 vattr.va_vaflags |= VA_UTIMES_NULL; 1735 } else if (error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv, 1736 sizeof (tv))) 1737 return (error); 1738 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1739 if (error = namei(&nd)) 1740 return (error); 1741 vp = nd.ni_vp; 1742 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1743 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 1744 vattr.va_atime.ts_sec = tv[0].tv_sec; 1745 vattr.va_atime.ts_nsec = tv[0].tv_usec * 1000; 1746 vattr.va_mtime.ts_sec = tv[1].tv_sec; 1747 vattr.va_mtime.ts_nsec = tv[1].tv_usec * 1000; 1748 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1749 vput(vp); 1750 return (error); 1751 } 1752 1753 /* 1754 * Truncate a file given its path name. 1755 */ 1756 /* ARGSUSED */ 1757 int 1758 truncate(p, uap, retval) 1759 struct proc *p; 1760 register struct truncate_args /* { 1761 syscallarg(char *) path; 1762 syscallarg(int) pad; 1763 syscallarg(off_t) length; 1764 } */ *uap; 1765 register_t *retval; 1766 { 1767 register struct vnode *vp; 1768 struct vattr vattr; 1769 int error; 1770 struct nameidata nd; 1771 1772 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1773 if (error = namei(&nd)) 1774 return (error); 1775 vp = nd.ni_vp; 1776 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1777 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 1778 if (vp->v_type == VDIR) 1779 error = EISDIR; 1780 else if ((error = vn_writechk(vp)) == 0 && 1781 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1782 VATTR_NULL(&vattr); 1783 vattr.va_size = SCARG(uap, length); 1784 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1785 } 1786 vput(vp); 1787 return (error); 1788 } 1789 1790 /* 1791 * Truncate a file given a file descriptor. 1792 */ 1793 /* ARGSUSED */ 1794 int 1795 ftruncate(p, uap, retval) 1796 struct proc *p; 1797 register struct ftruncate_args /* { 1798 syscallarg(int) fd; 1799 syscallarg(int) pad; 1800 syscallarg(off_t) length; 1801 } */ *uap; 1802 register_t *retval; 1803 { 1804 struct vattr vattr; 1805 struct vnode *vp; 1806 struct file *fp; 1807 int error; 1808 1809 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1810 return (error); 1811 if ((fp->f_flag & FWRITE) == 0) 1812 return (EINVAL); 1813 vp = (struct vnode *)fp->f_data; 1814 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1815 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 1816 if (vp->v_type == VDIR) 1817 error = EISDIR; 1818 else if ((error = vn_writechk(vp)) == 0) { 1819 VATTR_NULL(&vattr); 1820 vattr.va_size = SCARG(uap, length); 1821 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1822 } 1823 VOP_UNLOCK(vp, 0, p); 1824 return (error); 1825 } 1826 1827 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1828 /* 1829 * Truncate a file given its path name. 1830 */ 1831 /* ARGSUSED */ 1832 int 1833 compat_43_truncate(p, uap, retval) 1834 struct proc *p; 1835 register struct compat_43_truncate_args /* { 1836 syscallarg(char *) path; 1837 syscallarg(long) length; 1838 } */ *uap; 1839 register_t *retval; 1840 { 1841 struct truncate_args /* { 1842 syscallarg(char *) path; 1843 syscallarg(int) pad; 1844 syscallarg(off_t) length; 1845 } */ nuap; 1846 1847 SCARG(&nuap, path) = SCARG(uap, path); 1848 SCARG(&nuap, length) = SCARG(uap, length); 1849 return (truncate(p, &nuap, retval)); 1850 } 1851 1852 /* 1853 * Truncate a file given a file descriptor. 1854 */ 1855 /* ARGSUSED */ 1856 int 1857 compat_43_ftruncate(p, uap, retval) 1858 struct proc *p; 1859 register struct compat_43_ftruncate_args /* { 1860 syscallarg(int) fd; 1861 syscallarg(long) length; 1862 } */ *uap; 1863 register_t *retval; 1864 { 1865 struct ftruncate_args /* { 1866 syscallarg(int) fd; 1867 syscallarg(int) pad; 1868 syscallarg(off_t) length; 1869 } */ nuap; 1870 1871 SCARG(&nuap, fd) = SCARG(uap, fd); 1872 SCARG(&nuap, length) = SCARG(uap, length); 1873 return (ftruncate(p, &nuap, retval)); 1874 } 1875 #endif /* COMPAT_43 || COMPAT_SUNOS */ 1876 1877 /* 1878 * Sync an open file. 1879 */ 1880 /* ARGSUSED */ 1881 int 1882 fsync(p, uap, retval) 1883 struct proc *p; 1884 struct fsync_args /* { 1885 syscallarg(int) fd; 1886 } */ *uap; 1887 register_t *retval; 1888 { 1889 register struct vnode *vp; 1890 struct file *fp; 1891 int error; 1892 1893 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 1894 return (error); 1895 vp = (struct vnode *)fp->f_data; 1896 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 1897 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p); 1898 VOP_UNLOCK(vp, 0, p); 1899 return (error); 1900 } 1901 1902 /* 1903 * Rename files. Source and destination must either both be directories, 1904 * or both not be directories. If target is a directory, it must be empty. 1905 */ 1906 /* ARGSUSED */ 1907 int 1908 rename(p, uap, retval) 1909 struct proc *p; 1910 register struct rename_args /* { 1911 syscallarg(char *) from; 1912 syscallarg(char *) to; 1913 } */ *uap; 1914 register_t *retval; 1915 { 1916 register struct vnode *tvp, *fvp, *tdvp; 1917 struct nameidata fromnd, tond; 1918 int error; 1919 1920 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 1921 SCARG(uap, from), p); 1922 if (error = namei(&fromnd)) 1923 return (error); 1924 fvp = fromnd.ni_vp; 1925 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 1926 UIO_USERSPACE, SCARG(uap, to), p); 1927 if (error = namei(&tond)) { 1928 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1929 vrele(fromnd.ni_dvp); 1930 vrele(fvp); 1931 goto out1; 1932 } 1933 tdvp = tond.ni_dvp; 1934 tvp = tond.ni_vp; 1935 if (tvp != NULL) { 1936 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 1937 error = ENOTDIR; 1938 goto out; 1939 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 1940 error = EISDIR; 1941 goto out; 1942 } 1943 } 1944 if (fvp == tdvp) 1945 error = EINVAL; 1946 /* 1947 * If source is the same as the destination (that is the 1948 * same inode number with the same name in the same directory), 1949 * then there is nothing to do. 1950 */ 1951 if (fvp == tvp && fromnd.ni_dvp == tdvp && 1952 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 1953 !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, 1954 fromnd.ni_cnd.cn_namelen)) 1955 error = -1; 1956 out: 1957 if (!error) { 1958 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 1959 if (fromnd.ni_dvp != tdvp) 1960 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1961 if (tvp) 1962 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 1963 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 1964 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 1965 } else { 1966 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 1967 if (tdvp == tvp) 1968 vrele(tdvp); 1969 else 1970 vput(tdvp); 1971 if (tvp) 1972 vput(tvp); 1973 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1974 vrele(fromnd.ni_dvp); 1975 vrele(fvp); 1976 } 1977 vrele(tond.ni_startdir); 1978 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 1979 out1: 1980 if (fromnd.ni_startdir) 1981 vrele(fromnd.ni_startdir); 1982 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 1983 if (error == -1) 1984 return (0); 1985 return (error); 1986 } 1987 1988 /* 1989 * Make a directory file. 1990 */ 1991 /* ARGSUSED */ 1992 int 1993 mkdir(p, uap, retval) 1994 struct proc *p; 1995 register struct mkdir_args /* { 1996 syscallarg(char *) path; 1997 syscallarg(int) mode; 1998 } */ *uap; 1999 register_t *retval; 2000 { 2001 register struct vnode *vp; 2002 struct vattr vattr; 2003 int error; 2004 struct nameidata nd; 2005 2006 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2007 if (error = namei(&nd)) 2008 return (error); 2009 vp = nd.ni_vp; 2010 if (vp != NULL) { 2011 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2012 if (nd.ni_dvp == vp) 2013 vrele(nd.ni_dvp); 2014 else 2015 vput(nd.ni_dvp); 2016 vrele(vp); 2017 return (EEXIST); 2018 } 2019 VATTR_NULL(&vattr); 2020 vattr.va_type = VDIR; 2021 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 2022 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2023 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2024 if (!error) 2025 vput(nd.ni_vp); 2026 return (error); 2027 } 2028 2029 /* 2030 * Remove a directory file. 2031 */ 2032 /* ARGSUSED */ 2033 int 2034 rmdir(p, uap, retval) 2035 struct proc *p; 2036 struct rmdir_args /* { 2037 syscallarg(char *) path; 2038 } */ *uap; 2039 register_t *retval; 2040 { 2041 register struct vnode *vp; 2042 int error; 2043 struct nameidata nd; 2044 2045 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2046 SCARG(uap, path), p); 2047 if (error = namei(&nd)) 2048 return (error); 2049 vp = nd.ni_vp; 2050 if (vp->v_type != VDIR) { 2051 error = ENOTDIR; 2052 goto out; 2053 } 2054 /* 2055 * No rmdir "." please. 2056 */ 2057 if (nd.ni_dvp == vp) { 2058 error = EINVAL; 2059 goto out; 2060 } 2061 /* 2062 * The root of a mounted filesystem cannot be deleted. 2063 */ 2064 if (vp->v_flag & VROOT) 2065 error = EBUSY; 2066 out: 2067 if (!error) { 2068 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2069 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2070 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2071 } else { 2072 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2073 if (nd.ni_dvp == vp) 2074 vrele(nd.ni_dvp); 2075 else 2076 vput(nd.ni_dvp); 2077 vput(vp); 2078 } 2079 return (error); 2080 } 2081 2082 #ifdef COMPAT_43 2083 /* 2084 * Read a block of directory entries in a file system independent format. 2085 */ 2086 int 2087 compat_43_getdirentries(p, uap, retval) 2088 struct proc *p; 2089 register struct compat_43_getdirentries_args /* { 2090 syscallarg(int) fd; 2091 syscallarg(char *) buf; 2092 syscallarg(u_int) count; 2093 syscallarg(long *) basep; 2094 } */ *uap; 2095 register_t *retval; 2096 { 2097 register struct vnode *vp; 2098 struct file *fp; 2099 struct uio auio, kuio; 2100 struct iovec aiov, kiov; 2101 struct dirent *dp, *edp; 2102 caddr_t dirbuf; 2103 int error, eofflag, readcnt; 2104 long loff; 2105 2106 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 2107 return (error); 2108 if ((fp->f_flag & FREAD) == 0) 2109 return (EBADF); 2110 vp = (struct vnode *)fp->f_data; 2111 unionread: 2112 if (vp->v_type != VDIR) 2113 return (EINVAL); 2114 aiov.iov_base = SCARG(uap, buf); 2115 aiov.iov_len = SCARG(uap, count); 2116 auio.uio_iov = &aiov; 2117 auio.uio_iovcnt = 1; 2118 auio.uio_rw = UIO_READ; 2119 auio.uio_segflg = UIO_USERSPACE; 2120 auio.uio_procp = p; 2121 auio.uio_resid = SCARG(uap, count); 2122 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 2123 loff = auio.uio_offset = fp->f_offset; 2124 # if (BYTE_ORDER != LITTLE_ENDIAN) 2125 if (vp->v_mount->mnt_maxsymlinklen <= 0) { 2126 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 2127 (int *)0, (u_long *)0); 2128 fp->f_offset = auio.uio_offset; 2129 } else 2130 # endif 2131 { 2132 kuio = auio; 2133 kuio.uio_iov = &kiov; 2134 kuio.uio_segflg = UIO_SYSSPACE; 2135 kiov.iov_len = SCARG(uap, count); 2136 MALLOC(dirbuf, caddr_t, SCARG(uap, count), M_TEMP, M_WAITOK); 2137 kiov.iov_base = dirbuf; 2138 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, 2139 (int *)0, (u_long *)0); 2140 fp->f_offset = kuio.uio_offset; 2141 if (error == 0) { 2142 readcnt = SCARG(uap, count) - kuio.uio_resid; 2143 edp = (struct dirent *)&dirbuf[readcnt]; 2144 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 2145 # if (BYTE_ORDER == LITTLE_ENDIAN) 2146 /* 2147 * The expected low byte of 2148 * dp->d_namlen is our dp->d_type. 2149 * The high MBZ byte of dp->d_namlen 2150 * is our dp->d_namlen. 2151 */ 2152 dp->d_type = dp->d_namlen; 2153 dp->d_namlen = 0; 2154 # else 2155 /* 2156 * The dp->d_type is the high byte 2157 * of the expected dp->d_namlen, 2158 * so must be zero'ed. 2159 */ 2160 dp->d_type = 0; 2161 # endif 2162 if (dp->d_reclen > 0) { 2163 dp = (struct dirent *) 2164 ((char *)dp + dp->d_reclen); 2165 } else { 2166 error = EIO; 2167 break; 2168 } 2169 } 2170 if (dp >= edp) 2171 error = uiomove(dirbuf, readcnt, &auio); 2172 } 2173 FREE(dirbuf, M_TEMP); 2174 } 2175 VOP_UNLOCK(vp, 0, p); 2176 if (error) 2177 return (error); 2178 2179 #ifdef UNION 2180 { 2181 extern int (**union_vnodeop_p)(); 2182 extern struct vnode *union_dircache __P((struct vnode*, struct proc*)); 2183 2184 if ((SCARG(uap, count) == auio.uio_resid) && 2185 (vp->v_op == union_vnodeop_p)) { 2186 struct vnode *lvp; 2187 2188 lvp = union_dircache(vp, p); 2189 if (lvp != NULLVP) { 2190 struct vattr va; 2191 2192 /* 2193 * If the directory is opaque, 2194 * then don't show lower entries 2195 */ 2196 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 2197 if (va.va_flags & OPAQUE) { 2198 vput(lvp); 2199 lvp = NULL; 2200 } 2201 } 2202 2203 if (lvp != NULLVP) { 2204 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 2205 if (error) { 2206 vput(lvp); 2207 return (error); 2208 } 2209 VOP_UNLOCK(lvp, 0, p); 2210 fp->f_data = (caddr_t) lvp; 2211 fp->f_offset = 0; 2212 error = vn_close(vp, FREAD, fp->f_cred, p); 2213 if (error) 2214 return (error); 2215 vp = lvp; 2216 goto unionread; 2217 } 2218 } 2219 } 2220 #endif /* UNION */ 2221 2222 if ((SCARG(uap, count) == auio.uio_resid) && 2223 (vp->v_flag & VROOT) && 2224 (vp->v_mount->mnt_flag & MNT_UNION)) { 2225 struct vnode *tvp = vp; 2226 vp = vp->v_mount->mnt_vnodecovered; 2227 VREF(vp); 2228 fp->f_data = (caddr_t) vp; 2229 fp->f_offset = 0; 2230 vrele(tvp); 2231 goto unionread; 2232 } 2233 error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), 2234 sizeof(long)); 2235 *retval = SCARG(uap, count) - auio.uio_resid; 2236 return (error); 2237 } 2238 #endif /* COMPAT_43 */ 2239 2240 /* 2241 * Read a block of directory entries in a file system independent format. 2242 */ 2243 int 2244 getdirentries(p, uap, retval) 2245 struct proc *p; 2246 register struct getdirentries_args /* { 2247 syscallarg(int) fd; 2248 syscallarg(char *) buf; 2249 syscallarg(u_int) count; 2250 syscallarg(long *) basep; 2251 } */ *uap; 2252 register_t *retval; 2253 { 2254 register struct vnode *vp; 2255 struct file *fp; 2256 struct uio auio; 2257 struct iovec aiov; 2258 long loff; 2259 int error, eofflag; 2260 2261 if (error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) 2262 return (error); 2263 if ((fp->f_flag & FREAD) == 0) 2264 return (EBADF); 2265 vp = (struct vnode *)fp->f_data; 2266 unionread: 2267 if (vp->v_type != VDIR) 2268 return (EINVAL); 2269 aiov.iov_base = SCARG(uap, buf); 2270 aiov.iov_len = SCARG(uap, count); 2271 auio.uio_iov = &aiov; 2272 auio.uio_iovcnt = 1; 2273 auio.uio_rw = UIO_READ; 2274 auio.uio_segflg = UIO_USERSPACE; 2275 auio.uio_procp = p; 2276 auio.uio_resid = SCARG(uap, count); 2277 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 2278 loff = auio.uio_offset = fp->f_offset; 2279 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 2280 (int *)0, (u_long *)0); 2281 fp->f_offset = auio.uio_offset; 2282 VOP_UNLOCK(vp, 0, p); 2283 if (error) 2284 return (error); 2285 2286 #ifdef UNION 2287 { 2288 extern int (**union_vnodeop_p)(); 2289 extern struct vnode *union_dircache __P((struct vnode*, struct proc*)); 2290 2291 if ((SCARG(uap, count) == auio.uio_resid) && 2292 (vp->v_op == union_vnodeop_p)) { 2293 struct vnode *lvp; 2294 2295 lvp = union_dircache(vp, p); 2296 if (lvp != NULLVP) { 2297 struct vattr va; 2298 2299 /* 2300 * If the directory is opaque, 2301 * then don't show lower entries 2302 */ 2303 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 2304 if (va.va_flags & OPAQUE) { 2305 vput(lvp); 2306 lvp = NULL; 2307 } 2308 } 2309 2310 if (lvp != NULLVP) { 2311 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 2312 if (error) { 2313 vput(lvp); 2314 return (error); 2315 } 2316 VOP_UNLOCK(lvp, 0, p); 2317 fp->f_data = (caddr_t) lvp; 2318 fp->f_offset = 0; 2319 error = vn_close(vp, FREAD, fp->f_cred, p); 2320 if (error) 2321 return (error); 2322 vp = lvp; 2323 goto unionread; 2324 } 2325 } 2326 } 2327 #endif /* UNION */ 2328 2329 if ((SCARG(uap, count) == auio.uio_resid) && 2330 (vp->v_flag & VROOT) && 2331 (vp->v_mount->mnt_flag & MNT_UNION)) { 2332 struct vnode *tvp = vp; 2333 vp = vp->v_mount->mnt_vnodecovered; 2334 VREF(vp); 2335 fp->f_data = (caddr_t) vp; 2336 fp->f_offset = 0; 2337 vrele(tvp); 2338 goto unionread; 2339 } 2340 error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), 2341 sizeof(long)); 2342 *retval = SCARG(uap, count) - auio.uio_resid; 2343 return (error); 2344 } 2345 2346 /* 2347 * Set the mode mask for creation of filesystem nodes. 2348 */ 2349 int 2350 umask(p, uap, retval) 2351 struct proc *p; 2352 struct umask_args /* { 2353 syscallarg(int) newmask; 2354 } */ *uap; 2355 register_t *retval; 2356 { 2357 register struct filedesc *fdp; 2358 2359 fdp = p->p_fd; 2360 *retval = fdp->fd_cmask; 2361 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2362 return (0); 2363 } 2364 2365 /* 2366 * Void all references to file by ripping underlying filesystem 2367 * away from vnode. 2368 */ 2369 /* ARGSUSED */ 2370 int 2371 revoke(p, uap, retval) 2372 struct proc *p; 2373 register struct revoke_args /* { 2374 syscallarg(char *) path; 2375 } */ *uap; 2376 register_t *retval; 2377 { 2378 register struct vnode *vp; 2379 struct vattr vattr; 2380 int error; 2381 struct nameidata nd; 2382 2383 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2384 if (error = namei(&nd)) 2385 return (error); 2386 vp = nd.ni_vp; 2387 if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) 2388 goto out; 2389 if (p->p_ucred->cr_uid != vattr.va_uid && 2390 (error = suser(p->p_ucred, &p->p_acflag))) 2391 goto out; 2392 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2393 VOP_REVOKE(vp, REVOKEALL); 2394 out: 2395 vrele(vp); 2396 return (error); 2397 } 2398 2399 /* 2400 * Convert a user file descriptor to a kernel file entry. 2401 */ 2402 int 2403 getvnode(fdp, fd, fpp) 2404 struct filedesc *fdp; 2405 struct file **fpp; 2406 int fd; 2407 { 2408 struct file *fp; 2409 2410 if ((u_int)fd >= fdp->fd_nfiles || 2411 (fp = fdp->fd_ofiles[fd]) == NULL) 2412 return (EBADF); 2413 if (fp->f_type != DTYPE_VNODE) 2414 return (EINVAL); 2415 *fpp = fp; 2416 return (0); 2417 } 2418
Indexes created Fri Oct 03 02:09:57 GMT 2025