vfs_syscalls.c revision 1.100
1 /* $NetBSD: vfs_syscalls.c,v 1.100 1997/10/09 00:39:19 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/namei.h> 46 #include <sys/filedesc.h> 47 #include <sys/kernel.h> 48 #include <sys/file.h> 49 #include <sys/stat.h> 50 #include <sys/vnode.h> 51 #include <sys/mount.h> 52 #include <sys/proc.h> 53 #include <sys/uio.h> 54 #include <sys/malloc.h> 55 #include <sys/dirent.h> 56 57 #include <sys/syscallargs.h> 58 59 #include <vm/vm.h> 60 #include <sys/sysctl.h> 61 62 static int change_dir __P((struct nameidata *, struct proc *)); 63 static int change_mode __P((struct vnode *, int, struct proc *p)); 64 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *)); 65 static int change_utimes __P((struct vnode *vp, const struct timeval *, 66 struct proc *p)); 67 static int rename_files __P((const char *, const char *, struct proc *, int)); 68 69 void checkdirs __P((struct vnode *)); 70 int dounmount __P((struct mount *, int, struct proc *)); 71 72 /* 73 * Virtual File System System Calls 74 */ 75 76 /* 77 * Mount a file system. 78 */ 79 80 #if defined(COMPAT_09) || defined(COMPAT_43) 81 /* 82 * This table is used to maintain compatibility with 4.3BSD 83 * and NetBSD 0.9 mount syscalls. Note, the order is important! 84 */ 85 static const char *mountcompatnames[] = { 86 NULL, /* 0 = MOUNT_NONE */ 87 MOUNT_FFS, /* 1 */ 88 MOUNT_NFS, /* 2 */ 89 MOUNT_MFS, /* 3 */ 90 MOUNT_MSDOS, /* 4 */ 91 MOUNT_LFS, /* 5 */ 92 NULL, /* 6 = MOUNT_LOFS */ 93 MOUNT_FDESC, /* 7 */ 94 MOUNT_PORTAL, /* 8 */ 95 MOUNT_NULL, /* 9 */ 96 MOUNT_UMAP, /* 10 */ 97 MOUNT_KERNFS, /* 11 */ 98 MOUNT_PROCFS, /* 12 */ 99 MOUNT_AFS, /* 13 */ 100 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 101 MOUNT_UNION, /* 15 */ 102 MOUNT_ADOSFS, /* 16 */ 103 MOUNT_EXT2FS, /* 17 */ 104 }; 105 static const int nmountcompatnames = sizeof(mountcompatnames) / 106 sizeof(mountcompatnames[0]); 107 #endif /* COMPAT_09 || COMPAT_43 */ 108 109 /* ARGSUSED */ 110 int 111 sys_mount(p, v, retval) 112 struct proc *p; 113 void *v; 114 register_t *retval; 115 { 116 register struct sys_mount_args /* { 117 syscallarg(const char *) type; 118 syscallarg(const char *) path; 119 syscallarg(int) flags; 120 syscallarg(void *) data; 121 } */ *uap = v; 122 register struct vnode *vp; 123 register struct mount *mp; 124 int error, flag = 0; 125 struct vfsops *vops; 126 char fstypename[MFSNAMELEN]; 127 struct vattr va; 128 struct nameidata nd; 129 130 vops = NULL; /* XXX gcc -Wuninitialized */ 131 132 /* 133 * Get vnode to be covered 134 */ 135 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 136 SCARG(uap, path), p); 137 if ((error = namei(&nd)) != 0) 138 return (error); 139 vp = nd.ni_vp; 140 if (SCARG(uap, flags) & MNT_UPDATE) { 141 if ((vp->v_flag & VROOT) == 0) { 142 vput(vp); 143 return (EINVAL); 144 } 145 mp = vp->v_mount; 146 flag = mp->mnt_flag; 147 /* 148 * We only allow the filesystem to be reloaded if it 149 * is currently mounted read-only. 150 */ 151 if ((SCARG(uap, flags) & MNT_RELOAD) && 152 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 153 vput(vp); 154 return (EOPNOTSUPP); /* Needs translation */ 155 } 156 mp->mnt_flag |= 157 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 158 /* 159 * Only root, or the user that did the original mount is 160 * permitted to update it. 161 */ 162 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 163 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 164 vput(vp); 165 return (error); 166 } 167 /* 168 * Do not allow NFS export by non-root users. Silently 169 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 170 */ 171 if (p->p_ucred->cr_uid != 0) { 172 if (SCARG(uap, flags) & MNT_EXPORTED) { 173 vput(vp); 174 return (EPERM); 175 } 176 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 177 } 178 VOP_UNLOCK(vp); 179 goto update; 180 } 181 /* 182 * If the user is not root, ensure that they own the directory 183 * onto which we are attempting to mount. 184 */ 185 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 186 (va.va_uid != p->p_ucred->cr_uid && 187 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 188 vput(vp); 189 return (error); 190 } 191 /* 192 * Do not allow NFS export by non-root users. Silently 193 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 194 */ 195 if (p->p_ucred->cr_uid != 0) { 196 if (SCARG(uap, flags) & MNT_EXPORTED) { 197 vput(vp); 198 return (EPERM); 199 } 200 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 201 } 202 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 203 return (error); 204 if (vp->v_type != VDIR) { 205 vput(vp); 206 return (ENOTDIR); 207 } 208 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 209 if (error) { 210 #if defined(COMPAT_09) || defined(COMPAT_43) 211 u_long fsindex; 212 213 /* 214 * Historically filesystem types were identified by number. 215 * If we get an integer for the filesystem type instead of a 216 * string, we check to see if it matches one of the historic 217 * filesystem types. 218 */ 219 fsindex = (u_long)SCARG(uap, type); 220 if (fsindex >= nmountcompatnames || 221 mountcompatnames[fsindex] == NULL) { 222 vput(vp); 223 return (ENODEV); 224 } 225 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 226 #else 227 vput(vp); 228 return (error); 229 #endif 230 } 231 #ifdef COMPAT_10 232 /* Accept `ufs' as an alias for `ffs'. */ 233 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 234 strncpy(fstypename, "ffs", MFSNAMELEN); 235 #endif 236 fstypename[MFSNAMELEN - 1] = '\0'; /* sanity */ 237 vops = vfs_getopsbyname(fstypename); 238 if (vops == NULL) { 239 vput(vp); 240 return (ENODEV); 241 } 242 if (vp->v_mountedhere != NULL) { 243 vput(vp); 244 return (EBUSY); 245 } 246 247 /* 248 * Allocate and initialize the file system. 249 */ 250 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 251 M_MOUNT, M_WAITOK); 252 bzero((char *)mp, (u_long)sizeof(struct mount)); 253 mp->mnt_op = vops; 254 if ((error = vfs_lock(mp)) != 0) { 255 free((caddr_t)mp, M_MOUNT); 256 vput(vp); 257 return (error); 258 } 259 /* Do this early in case we block later. */ 260 vops->vfs_refcount++; 261 vp->v_mountedhere = mp; 262 mp->mnt_vnodecovered = vp; 263 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 264 update: 265 /* 266 * Set the mount level flags. 267 */ 268 if (SCARG(uap, flags) & MNT_RDONLY) 269 mp->mnt_flag |= MNT_RDONLY; 270 else if (mp->mnt_flag & MNT_RDONLY) 271 mp->mnt_flag |= MNT_WANTRDWR; 272 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 273 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 274 MNT_NOATIME); 275 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 276 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 277 MNT_NOCOREDUMP | MNT_NOATIME); 278 /* 279 * Mount the filesystem. 280 */ 281 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 282 if (mp->mnt_flag & MNT_UPDATE) { 283 vrele(vp); 284 if (mp->mnt_flag & MNT_WANTRDWR) 285 mp->mnt_flag &= ~MNT_RDONLY; 286 mp->mnt_flag &=~ 287 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 288 if (error) 289 mp->mnt_flag = flag; 290 return (error); 291 } 292 /* 293 * Put the new filesystem on the mount list after root. 294 */ 295 cache_purge(vp); 296 if (!error) { 297 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 298 checkdirs(vp); 299 VOP_UNLOCK(vp); 300 vfs_unlock(mp); 301 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 302 error = VFS_START(mp, 0, p); 303 } else { 304 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 305 vops->vfs_refcount--; 306 vfs_unlock(mp); 307 free((caddr_t)mp, M_MOUNT); 308 vput(vp); 309 } 310 return (error); 311 } 312 313 /* 314 * Scan all active processes to see if any of them have a current 315 * or root directory onto which the new filesystem has just been 316 * mounted. If so, replace them with the new mount point. 317 */ 318 void 319 checkdirs(olddp) 320 struct vnode *olddp; 321 { 322 struct filedesc *fdp; 323 struct vnode *newdp; 324 struct proc *p; 325 326 if (olddp->v_usecount == 1) 327 return; 328 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 329 panic("mount: lost mount"); 330 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 331 fdp = p->p_fd; 332 if (fdp->fd_cdir == olddp) { 333 vrele(fdp->fd_cdir); 334 VREF(newdp); 335 fdp->fd_cdir = newdp; 336 } 337 if (fdp->fd_rdir == olddp) { 338 vrele(fdp->fd_rdir); 339 VREF(newdp); 340 fdp->fd_rdir = newdp; 341 } 342 } 343 if (rootvnode == olddp) { 344 vrele(rootvnode); 345 VREF(newdp); 346 rootvnode = newdp; 347 } 348 vput(newdp); 349 } 350 351 /* 352 * Unmount a file system. 353 * 354 * Note: unmount takes a path to the vnode mounted on as argument, 355 * not special file (as before). 356 */ 357 /* ARGSUSED */ 358 int 359 sys_unmount(p, v, retval) 360 struct proc *p; 361 void *v; 362 register_t *retval; 363 { 364 register struct sys_unmount_args /* { 365 syscallarg(const char *) path; 366 syscallarg(int) flags; 367 } */ *uap = v; 368 register struct vnode *vp; 369 struct mount *mp; 370 int error; 371 struct nameidata nd; 372 373 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 374 SCARG(uap, path), p); 375 if ((error = namei(&nd)) != 0) 376 return (error); 377 vp = nd.ni_vp; 378 mp = vp->v_mount; 379 380 /* 381 * Only root, or the user that did the original mount is 382 * permitted to unmount this filesystem. 383 */ 384 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 385 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 386 vput(vp); 387 return (error); 388 } 389 390 /* 391 * Don't allow unmounting the root file system. 392 */ 393 if (mp->mnt_flag & MNT_ROOTFS) { 394 vput(vp); 395 return (EINVAL); 396 } 397 398 /* 399 * Must be the root of the filesystem 400 */ 401 if ((vp->v_flag & VROOT) == 0) { 402 vput(vp); 403 return (EINVAL); 404 } 405 vput(vp); 406 407 if (vfs_busy(mp)) 408 return (EBUSY); 409 410 return (dounmount(mp, SCARG(uap, flags), p)); 411 } 412 413 /* 414 * Do the actual file system unmount. File system is assumed to have been 415 * marked busy by the caller. 416 */ 417 int 418 dounmount(mp, flags, p) 419 register struct mount *mp; 420 int flags; 421 struct proc *p; 422 { 423 struct vnode *coveredvp; 424 int error; 425 426 coveredvp = mp->mnt_vnodecovered; 427 mp->mnt_flag |= MNT_UNMOUNT; 428 if ((error = vfs_lock(mp)) != 0) { 429 vfs_unbusy(mp); 430 return (error); 431 } 432 433 if (mp->mnt_flag & MNT_EXPUBLIC) 434 vfs_setpublicfs(NULL, NULL, NULL); 435 436 mp->mnt_flag &=~ MNT_ASYNC; 437 vnode_pager_umount(mp); /* release cached vnodes */ 438 cache_purgevfs(mp); /* remove cache entries for this file sys */ 439 if ((error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0 || 440 (flags & MNT_FORCE)) 441 error = VFS_UNMOUNT(mp, flags, p); 442 mp->mnt_flag &= ~MNT_UNMOUNT; 443 vfs_unbusy(mp); 444 if (error) { 445 vfs_unlock(mp); 446 } else { 447 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 448 if (coveredvp != NULLVP) { 449 vrele(coveredvp); 450 coveredvp->v_mountedhere = (struct mount *)0; 451 } 452 mp->mnt_op->vfs_refcount--; 453 vfs_unlock(mp); 454 if (mp->mnt_vnodelist.lh_first != NULL) 455 panic("unmount: dangling vnode"); 456 free((caddr_t)mp, M_MOUNT); 457 } 458 return (error); 459 } 460 461 /* 462 * Sync each mounted filesystem. 463 */ 464 #ifdef DEBUG 465 int syncprt = 0; 466 struct ctldebug debug0 = { "syncprt", &syncprt }; 467 #endif 468 469 /* ARGSUSED */ 470 int 471 sys_sync(p, v, retval) 472 struct proc *p; 473 void *v; 474 register_t *retval; 475 { 476 register struct mount *mp, *nmp; 477 int asyncflag; 478 479 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 480 /* 481 * Get the prev pointer in case we hang on vfs_busy 482 * while we are being unmounted. 483 */ 484 nmp = mp->mnt_list.cqe_prev; 485 /* 486 * The lock check below is to avoid races with mount 487 * and unmount. 488 */ 489 if ((mp->mnt_flag & (MNT_MLOCK|MNT_RDONLY|MNT_MPBUSY)) == 0 && 490 !vfs_busy(mp)) { 491 asyncflag = mp->mnt_flag & MNT_ASYNC; 492 mp->mnt_flag &= ~MNT_ASYNC; 493 vnode_pager_sync(mp); 494 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 495 if (asyncflag) 496 mp->mnt_flag |= MNT_ASYNC; 497 /* 498 * Get the prev pointer again, as the prior filesystem 499 * might have been unmounted while we were sync'ing. 500 */ 501 nmp = mp->mnt_list.cqe_prev; 502 vfs_unbusy(mp); 503 } 504 } 505 #ifdef DEBUG 506 if (syncprt) 507 vfs_bufstats(); 508 #endif /* DEBUG */ 509 return (0); 510 } 511 512 /* 513 * Change filesystem quotas. 514 */ 515 /* ARGSUSED */ 516 int 517 sys_quotactl(p, v, retval) 518 struct proc *p; 519 void *v; 520 register_t *retval; 521 { 522 register struct sys_quotactl_args /* { 523 syscallarg(const char *) path; 524 syscallarg(int) cmd; 525 syscallarg(int) uid; 526 syscallarg(caddr_t) arg; 527 } */ *uap = v; 528 register struct mount *mp; 529 int error; 530 struct nameidata nd; 531 532 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 533 if ((error = namei(&nd)) != 0) 534 return (error); 535 mp = nd.ni_vp->v_mount; 536 vrele(nd.ni_vp); 537 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 538 SCARG(uap, arg), p)); 539 } 540 541 /* 542 * Get filesystem statistics. 543 */ 544 /* ARGSUSED */ 545 int 546 sys_statfs(p, v, retval) 547 struct proc *p; 548 void *v; 549 register_t *retval; 550 { 551 register struct sys_statfs_args /* { 552 syscallarg(const char *) path; 553 syscallarg(struct statfs *) buf; 554 } */ *uap = v; 555 register struct mount *mp; 556 register struct statfs *sp; 557 int error; 558 struct nameidata nd; 559 560 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 561 if ((error = namei(&nd)) != 0) 562 return (error); 563 mp = nd.ni_vp->v_mount; 564 sp = &mp->mnt_stat; 565 vrele(nd.ni_vp); 566 if ((error = VFS_STATFS(mp, sp, p)) != 0) 567 return (error); 568 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 569 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 570 } 571 572 /* 573 * Get filesystem statistics. 574 */ 575 /* ARGSUSED */ 576 int 577 sys_fstatfs(p, v, retval) 578 struct proc *p; 579 void *v; 580 register_t *retval; 581 { 582 register struct sys_fstatfs_args /* { 583 syscallarg(int) fd; 584 syscallarg(struct statfs *) buf; 585 } */ *uap = v; 586 struct file *fp; 587 struct mount *mp; 588 register struct statfs *sp; 589 int error; 590 591 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 592 return (error); 593 mp = ((struct vnode *)fp->f_data)->v_mount; 594 sp = &mp->mnt_stat; 595 if ((error = VFS_STATFS(mp, sp, p)) != 0) 596 return (error); 597 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 598 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 599 } 600 601 /* 602 * Get statistics on all filesystems. 603 */ 604 int 605 sys_getfsstat(p, v, retval) 606 struct proc *p; 607 void *v; 608 register_t *retval; 609 { 610 register struct sys_getfsstat_args /* { 611 syscallarg(struct statfs *) buf; 612 syscallarg(long) bufsize; 613 syscallarg(int) flags; 614 } */ *uap = v; 615 register struct mount *mp, *nmp; 616 register struct statfs *sp; 617 caddr_t sfsp; 618 long count, maxcount, error; 619 620 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 621 sfsp = (caddr_t)SCARG(uap, buf); 622 for (count = 0, 623 mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 624 nmp = mp->mnt_list.cqe_next; 625 if (sfsp && count < maxcount && 626 ((mp->mnt_flag & MNT_MLOCK) == 0)) { 627 sp = &mp->mnt_stat; 628 /* 629 * If MNT_NOWAIT is specified, do not refresh the 630 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 631 */ 632 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 633 (SCARG(uap, flags) & MNT_WAIT)) && 634 (error = VFS_STATFS(mp, sp, p)) != 0) 635 continue; 636 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 637 error = copyout(sp, sfsp, sizeof(*sp)); 638 if (error) 639 return (error); 640 sfsp += sizeof(*sp); 641 } 642 count++; 643 } 644 if (sfsp && count > maxcount) 645 *retval = maxcount; 646 else 647 *retval = count; 648 return (0); 649 } 650 651 /* 652 * Change current working directory to a given file descriptor. 653 */ 654 /* ARGSUSED */ 655 int 656 sys_fchdir(p, v, retval) 657 struct proc *p; 658 void *v; 659 register_t *retval; 660 { 661 struct sys_fchdir_args /* { 662 syscallarg(int) fd; 663 } */ *uap = v; 664 register struct filedesc *fdp = p->p_fd; 665 struct vnode *vp, *tdp; 666 struct mount *mp; 667 struct file *fp; 668 int error; 669 670 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 671 return (error); 672 vp = (struct vnode *)fp->f_data; 673 VREF(vp); 674 VOP_LOCK(vp); 675 if (vp->v_type != VDIR) 676 error = ENOTDIR; 677 else 678 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 679 while (!error && (mp = vp->v_mountedhere) != NULL) { 680 if (mp->mnt_flag & MNT_MLOCK) { 681 mp->mnt_flag |= MNT_MWAIT; 682 sleep((caddr_t)mp, PVFS); 683 continue; 684 } 685 if ((error = VFS_ROOT(mp, &tdp)) != 0) 686 break; 687 vput(vp); 688 vp = tdp; 689 } 690 VOP_UNLOCK(vp); 691 if (error) { 692 vrele(vp); 693 return (error); 694 } 695 vrele(fdp->fd_cdir); 696 fdp->fd_cdir = vp; 697 return (0); 698 } 699 700 /* 701 * Change current working directory (``.''). 702 */ 703 /* ARGSUSED */ 704 int 705 sys_chdir(p, v, retval) 706 struct proc *p; 707 void *v; 708 register_t *retval; 709 { 710 struct sys_chdir_args /* { 711 syscallarg(const char *) path; 712 } */ *uap = v; 713 register struct filedesc *fdp = p->p_fd; 714 int error; 715 struct nameidata nd; 716 717 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 718 SCARG(uap, path), p); 719 if ((error = change_dir(&nd, p)) != 0) 720 return (error); 721 vrele(fdp->fd_cdir); 722 fdp->fd_cdir = nd.ni_vp; 723 return (0); 724 } 725 726 /* 727 * Change notion of root (``/'') directory. 728 */ 729 /* ARGSUSED */ 730 int 731 sys_chroot(p, v, retval) 732 struct proc *p; 733 void *v; 734 register_t *retval; 735 { 736 struct sys_chroot_args /* { 737 syscallarg(const char *) path; 738 } */ *uap = v; 739 register struct filedesc *fdp = p->p_fd; 740 int error; 741 struct nameidata nd; 742 743 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 744 return (error); 745 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 746 SCARG(uap, path), p); 747 if ((error = change_dir(&nd, p)) != 0) 748 return (error); 749 if (fdp->fd_rdir != NULL) 750 vrele(fdp->fd_rdir); 751 fdp->fd_rdir = nd.ni_vp; 752 return (0); 753 } 754 755 /* 756 * Common routine for chroot and chdir. 757 */ 758 static int 759 change_dir(ndp, p) 760 register struct nameidata *ndp; 761 struct proc *p; 762 { 763 struct vnode *vp; 764 int error; 765 766 if ((error = namei(ndp)) != 0) 767 return (error); 768 vp = ndp->ni_vp; 769 if (vp->v_type != VDIR) 770 error = ENOTDIR; 771 else 772 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 773 VOP_UNLOCK(vp); 774 if (error) 775 vrele(vp); 776 return (error); 777 } 778 779 /* 780 * Check permissions, allocate an open file structure, 781 * and call the device open routine if any. 782 */ 783 int 784 sys_open(p, v, retval) 785 struct proc *p; 786 void *v; 787 register_t *retval; 788 { 789 register struct sys_open_args /* { 790 syscallarg(const char *) path; 791 syscallarg(int) flags; 792 syscallarg(int) mode; 793 } */ *uap = v; 794 register struct filedesc *fdp = p->p_fd; 795 register struct file *fp; 796 register struct vnode *vp; 797 int flags, cmode; 798 struct file *nfp; 799 int type, indx, error; 800 struct flock lf; 801 struct nameidata nd; 802 extern struct fileops vnops; 803 804 if ((error = falloc(p, &nfp, &indx)) != 0) 805 return (error); 806 fp = nfp; 807 flags = FFLAGS(SCARG(uap, flags)); 808 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 809 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 810 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 811 if ((error = vn_open(&nd, flags, cmode)) != 0) { 812 ffree(fp); 813 if ((error == ENODEV || error == ENXIO) && 814 p->p_dupfd >= 0 && /* XXX from fdopen */ 815 (error = 816 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 817 *retval = indx; 818 return (0); 819 } 820 if (error == ERESTART) 821 error = EINTR; 822 fdp->fd_ofiles[indx] = NULL; 823 return (error); 824 } 825 p->p_dupfd = 0; 826 vp = nd.ni_vp; 827 fp->f_flag = flags & FMASK; 828 fp->f_type = DTYPE_VNODE; 829 fp->f_ops = &vnops; 830 fp->f_data = (caddr_t)vp; 831 if (flags & (O_EXLOCK | O_SHLOCK)) { 832 lf.l_whence = SEEK_SET; 833 lf.l_start = 0; 834 lf.l_len = 0; 835 if (flags & O_EXLOCK) 836 lf.l_type = F_WRLCK; 837 else 838 lf.l_type = F_RDLCK; 839 type = F_FLOCK; 840 if ((flags & FNONBLOCK) == 0) 841 type |= F_WAIT; 842 VOP_UNLOCK(vp); 843 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 844 if (error) { 845 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 846 ffree(fp); 847 fdp->fd_ofiles[indx] = NULL; 848 return (error); 849 } 850 VOP_LOCK(vp); 851 fp->f_flag |= FHASLOCK; 852 } 853 VOP_UNLOCK(vp); 854 *retval = indx; 855 return (0); 856 } 857 858 /* 859 * Create a special file. 860 */ 861 /* ARGSUSED */ 862 int 863 sys_mknod(p, v, retval) 864 struct proc *p; 865 void *v; 866 register_t *retval; 867 { 868 register struct sys_mknod_args /* { 869 syscallarg(const char *) path; 870 syscallarg(int) mode; 871 syscallarg(int) dev; 872 } */ *uap = v; 873 register struct vnode *vp; 874 struct vattr vattr; 875 int error; 876 int whiteout = 0; 877 struct nameidata nd; 878 879 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 880 return (error); 881 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 882 if ((error = namei(&nd)) != 0) 883 return (error); 884 vp = nd.ni_vp; 885 if (vp != NULL) 886 error = EEXIST; 887 else { 888 VATTR_NULL(&vattr); 889 vattr.va_mode = 890 (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 891 vattr.va_rdev = SCARG(uap, dev); 892 whiteout = 0; 893 894 switch (SCARG(uap, mode) & S_IFMT) { 895 case S_IFMT: /* used by badsect to flag bad sectors */ 896 vattr.va_type = VBAD; 897 break; 898 case S_IFCHR: 899 vattr.va_type = VCHR; 900 break; 901 case S_IFBLK: 902 vattr.va_type = VBLK; 903 break; 904 case S_IFWHT: 905 whiteout = 1; 906 break; 907 default: 908 error = EINVAL; 909 break; 910 } 911 } 912 if (!error) { 913 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 914 if (whiteout) { 915 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 916 if (error) 917 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 918 vput(nd.ni_dvp); 919 } else { 920 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 921 &nd.ni_cnd, &vattr); 922 } 923 } else { 924 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 925 if (nd.ni_dvp == vp) 926 vrele(nd.ni_dvp); 927 else 928 vput(nd.ni_dvp); 929 if (vp) 930 vrele(vp); 931 } 932 return (error); 933 } 934 935 /* 936 * Create a named pipe. 937 */ 938 /* ARGSUSED */ 939 int 940 sys_mkfifo(p, v, retval) 941 struct proc *p; 942 void *v; 943 register_t *retval; 944 { 945 #ifndef FIFO 946 return (EOPNOTSUPP); 947 #else 948 register struct sys_mkfifo_args /* { 949 syscallarg(const char *) path; 950 syscallarg(int) mode; 951 } */ *uap = v; 952 struct vattr vattr; 953 int error; 954 struct nameidata nd; 955 956 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 957 if ((error = namei(&nd)) != 0) 958 return (error); 959 if (nd.ni_vp != NULL) { 960 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 961 if (nd.ni_dvp == nd.ni_vp) 962 vrele(nd.ni_dvp); 963 else 964 vput(nd.ni_dvp); 965 vrele(nd.ni_vp); 966 return (EEXIST); 967 } 968 VATTR_NULL(&vattr); 969 vattr.va_type = VFIFO; 970 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 971 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 972 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 973 #endif /* FIFO */ 974 } 975 976 /* 977 * Make a hard file link. 978 */ 979 /* ARGSUSED */ 980 int 981 sys_link(p, v, retval) 982 struct proc *p; 983 void *v; 984 register_t *retval; 985 { 986 register struct sys_link_args /* { 987 syscallarg(const char *) path; 988 syscallarg(const char *) link; 989 } */ *uap = v; 990 register struct vnode *vp; 991 struct nameidata nd; 992 int error; 993 994 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 995 if ((error = namei(&nd)) != 0) 996 return (error); 997 vp = nd.ni_vp; 998 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 999 if ((error = namei(&nd)) != 0) 1000 goto out; 1001 if (nd.ni_vp) { 1002 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1003 if (nd.ni_dvp == nd.ni_vp) 1004 vrele(nd.ni_dvp); 1005 else 1006 vput(nd.ni_dvp); 1007 vrele(nd.ni_vp); 1008 error = EEXIST; 1009 goto out; 1010 } 1011 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1012 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1013 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1014 out: 1015 vrele(vp); 1016 return (error); 1017 } 1018 1019 /* 1020 * Make a symbolic link. 1021 */ 1022 /* ARGSUSED */ 1023 int 1024 sys_symlink(p, v, retval) 1025 struct proc *p; 1026 void *v; 1027 register_t *retval; 1028 { 1029 register struct sys_symlink_args /* { 1030 syscallarg(const char *) path; 1031 syscallarg(const char *) link; 1032 } */ *uap = v; 1033 struct vattr vattr; 1034 char *path; 1035 int error; 1036 struct nameidata nd; 1037 1038 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1039 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1040 if (error) 1041 goto out; 1042 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1043 if ((error = namei(&nd)) != 0) 1044 goto out; 1045 if (nd.ni_vp) { 1046 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1047 if (nd.ni_dvp == nd.ni_vp) 1048 vrele(nd.ni_dvp); 1049 else 1050 vput(nd.ni_dvp); 1051 vrele(nd.ni_vp); 1052 error = EEXIST; 1053 goto out; 1054 } 1055 VATTR_NULL(&vattr); 1056 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1057 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1058 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1059 out: 1060 FREE(path, M_NAMEI); 1061 return (error); 1062 } 1063 1064 /* 1065 * Delete a whiteout from the filesystem. 1066 */ 1067 /* ARGSUSED */ 1068 int 1069 sys_undelete(p, v, retval) 1070 struct proc *p; 1071 void *v; 1072 register_t *retval; 1073 { 1074 register struct sys_undelete_args /* { 1075 syscallarg(const char *) path; 1076 } */ *uap = v; 1077 int error; 1078 struct nameidata nd; 1079 1080 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1081 SCARG(uap, path), p); 1082 error = namei(&nd); 1083 if (error) 1084 return (error); 1085 1086 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1087 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1088 if (nd.ni_dvp == nd.ni_vp) 1089 vrele(nd.ni_dvp); 1090 else 1091 vput(nd.ni_dvp); 1092 if (nd.ni_vp) 1093 vrele(nd.ni_vp); 1094 return (EEXIST); 1095 } 1096 1097 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1098 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1099 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1100 vput(nd.ni_dvp); 1101 return (error); 1102 } 1103 1104 /* 1105 * Delete a name from the filesystem. 1106 */ 1107 /* ARGSUSED */ 1108 int 1109 sys_unlink(p, v, retval) 1110 struct proc *p; 1111 void *v; 1112 register_t *retval; 1113 { 1114 struct sys_unlink_args /* { 1115 syscallarg(const char *) path; 1116 } */ *uap = v; 1117 register struct vnode *vp; 1118 int error; 1119 struct nameidata nd; 1120 1121 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1122 SCARG(uap, path), p); 1123 if ((error = namei(&nd)) != 0) 1124 return (error); 1125 vp = nd.ni_vp; 1126 1127 /* 1128 * The root of a mounted filesystem cannot be deleted. 1129 */ 1130 if (vp->v_flag & VROOT) { 1131 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1132 if (nd.ni_dvp == vp) 1133 vrele(nd.ni_dvp); 1134 else 1135 vput(nd.ni_dvp); 1136 vput(vp); 1137 error = EBUSY; 1138 goto out; 1139 } 1140 1141 (void)vnode_pager_uncache(vp); 1142 1143 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1144 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1145 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1146 out: 1147 return (error); 1148 } 1149 1150 /* 1151 * Reposition read/write file offset. 1152 */ 1153 int 1154 sys_lseek(p, v, retval) 1155 struct proc *p; 1156 void *v; 1157 register_t *retval; 1158 { 1159 register struct sys_lseek_args /* { 1160 syscallarg(int) fd; 1161 syscallarg(int) pad; 1162 syscallarg(off_t) offset; 1163 syscallarg(int) whence; 1164 } */ *uap = v; 1165 struct ucred *cred = p->p_ucred; 1166 register struct filedesc *fdp = p->p_fd; 1167 register struct file *fp; 1168 struct vnode *vp; 1169 struct vattr vattr; 1170 register off_t newoff; 1171 int error; 1172 1173 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1174 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1175 return (EBADF); 1176 1177 vp = (struct vnode *)fp->f_data; 1178 if (fp->f_type != DTYPE_VNODE 1179 #ifdef FIFO 1180 || vp->v_type == VFIFO 1181 #endif 1182 ) 1183 return (ESPIPE); 1184 1185 switch (SCARG(uap, whence)) { 1186 case SEEK_CUR: 1187 newoff = fp->f_offset + SCARG(uap, offset); 1188 break; 1189 case SEEK_END: 1190 error = VOP_GETATTR(vp, &vattr, cred, p); 1191 if (error) 1192 return (error); 1193 newoff = SCARG(uap, offset) + vattr.va_size; 1194 break; 1195 case SEEK_SET: 1196 newoff = SCARG(uap, offset); 1197 break; 1198 default: 1199 return (EINVAL); 1200 } 1201 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1202 return (error); 1203 1204 *(off_t *)retval = fp->f_offset = newoff; 1205 return (0); 1206 } 1207 1208 /* 1209 * Check access permissions. 1210 */ 1211 int 1212 sys_access(p, v, retval) 1213 struct proc *p; 1214 void *v; 1215 register_t *retval; 1216 { 1217 register struct sys_access_args /* { 1218 syscallarg(const char *) path; 1219 syscallarg(int) flags; 1220 } */ *uap = v; 1221 register struct ucred *cred = p->p_ucred; 1222 register struct vnode *vp; 1223 int error, flags, t_gid, t_uid; 1224 struct nameidata nd; 1225 1226 t_uid = cred->cr_uid; 1227 t_gid = cred->cr_gid; 1228 cred->cr_uid = p->p_cred->p_ruid; 1229 cred->cr_gid = p->p_cred->p_rgid; 1230 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1231 SCARG(uap, path), p); 1232 if ((error = namei(&nd)) != 0) 1233 goto out1; 1234 vp = nd.ni_vp; 1235 1236 /* Flags == 0 means only check for existence. */ 1237 if (SCARG(uap, flags)) { 1238 flags = 0; 1239 if (SCARG(uap, flags) & R_OK) 1240 flags |= VREAD; 1241 if (SCARG(uap, flags) & W_OK) 1242 flags |= VWRITE; 1243 if (SCARG(uap, flags) & X_OK) 1244 flags |= VEXEC; 1245 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1246 error = VOP_ACCESS(vp, flags, cred, p); 1247 } 1248 vput(vp); 1249 out1: 1250 cred->cr_uid = t_uid; 1251 cred->cr_gid = t_gid; 1252 return (error); 1253 } 1254 1255 /* 1256 * Get file status; this version follows links. 1257 */ 1258 /* ARGSUSED */ 1259 int 1260 sys_stat(p, v, retval) 1261 struct proc *p; 1262 void *v; 1263 register_t *retval; 1264 { 1265 register struct sys_stat_args /* { 1266 syscallarg(const char *) path; 1267 syscallarg(struct stat *) ub; 1268 } */ *uap = v; 1269 struct stat sb; 1270 int error; 1271 struct nameidata nd; 1272 1273 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1274 SCARG(uap, path), p); 1275 if ((error = namei(&nd)) != 0) 1276 return (error); 1277 error = vn_stat(nd.ni_vp, &sb, p); 1278 vput(nd.ni_vp); 1279 if (error) 1280 return (error); 1281 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1282 return (error); 1283 } 1284 1285 /* 1286 * Get file status; this version does not follow links. 1287 */ 1288 /* ARGSUSED */ 1289 int 1290 sys_lstat(p, v, retval) 1291 struct proc *p; 1292 void *v; 1293 register_t *retval; 1294 { 1295 register struct sys_lstat_args /* { 1296 syscallarg(const char *) path; 1297 syscallarg(struct stat *) ub; 1298 } */ *uap = v; 1299 struct stat sb; 1300 int error; 1301 struct nameidata nd; 1302 1303 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1304 SCARG(uap, path), p); 1305 if ((error = namei(&nd)) != 0) 1306 return (error); 1307 error = vn_stat(nd.ni_vp, &sb, p); 1308 vput(nd.ni_vp); 1309 if (error) 1310 return (error); 1311 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1312 return (error); 1313 } 1314 1315 /* 1316 * Get configurable pathname variables. 1317 */ 1318 /* ARGSUSED */ 1319 int 1320 sys_pathconf(p, v, retval) 1321 struct proc *p; 1322 void *v; 1323 register_t *retval; 1324 { 1325 register struct sys_pathconf_args /* { 1326 syscallarg(const char *) path; 1327 syscallarg(int) name; 1328 } */ *uap = v; 1329 int error; 1330 struct nameidata nd; 1331 1332 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1333 SCARG(uap, path), p); 1334 if ((error = namei(&nd)) != 0) 1335 return (error); 1336 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1337 vput(nd.ni_vp); 1338 return (error); 1339 } 1340 1341 /* 1342 * Return target name of a symbolic link. 1343 */ 1344 /* ARGSUSED */ 1345 int 1346 sys_readlink(p, v, retval) 1347 struct proc *p; 1348 void *v; 1349 register_t *retval; 1350 { 1351 register struct sys_readlink_args /* { 1352 syscallarg(const char *) path; 1353 syscallarg(char *) buf; 1354 syscallarg(int) count; 1355 } */ *uap = v; 1356 register struct vnode *vp; 1357 struct iovec aiov; 1358 struct uio auio; 1359 int error; 1360 struct nameidata nd; 1361 1362 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1363 SCARG(uap, path), p); 1364 if ((error = namei(&nd)) != 0) 1365 return (error); 1366 vp = nd.ni_vp; 1367 if (vp->v_type != VLNK) 1368 error = EINVAL; 1369 else { 1370 aiov.iov_base = SCARG(uap, buf); 1371 aiov.iov_len = SCARG(uap, count); 1372 auio.uio_iov = &aiov; 1373 auio.uio_iovcnt = 1; 1374 auio.uio_offset = 0; 1375 auio.uio_rw = UIO_READ; 1376 auio.uio_segflg = UIO_USERSPACE; 1377 auio.uio_procp = p; 1378 auio.uio_resid = SCARG(uap, count); 1379 error = VOP_READLINK(vp, &auio, p->p_ucred); 1380 } 1381 vput(vp); 1382 *retval = SCARG(uap, count) - auio.uio_resid; 1383 return (error); 1384 } 1385 1386 /* 1387 * Change flags of a file given a path name. 1388 */ 1389 /* ARGSUSED */ 1390 int 1391 sys_chflags(p, v, retval) 1392 struct proc *p; 1393 void *v; 1394 register_t *retval; 1395 { 1396 register struct sys_chflags_args /* { 1397 syscallarg(const char *) path; 1398 syscallarg(u_long) flags; 1399 } */ *uap = v; 1400 register struct vnode *vp; 1401 struct vattr vattr; 1402 int error; 1403 struct nameidata nd; 1404 1405 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1406 if ((error = namei(&nd)) != 0) 1407 return (error); 1408 vp = nd.ni_vp; 1409 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1410 VOP_LOCK(vp); 1411 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1412 error = EROFS; 1413 else { 1414 VATTR_NULL(&vattr); 1415 vattr.va_flags = SCARG(uap, flags); 1416 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1417 } 1418 vput(vp); 1419 return (error); 1420 } 1421 1422 /* 1423 * Change flags of a file given a file descriptor. 1424 */ 1425 /* ARGSUSED */ 1426 int 1427 sys_fchflags(p, v, retval) 1428 struct proc *p; 1429 void *v; 1430 register_t *retval; 1431 { 1432 register struct sys_fchflags_args /* { 1433 syscallarg(int) fd; 1434 syscallarg(u_long) flags; 1435 } */ *uap = v; 1436 struct vattr vattr; 1437 struct vnode *vp; 1438 struct file *fp; 1439 int error; 1440 1441 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1442 return (error); 1443 vp = (struct vnode *)fp->f_data; 1444 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1445 VOP_LOCK(vp); 1446 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1447 error = EROFS; 1448 else { 1449 VATTR_NULL(&vattr); 1450 vattr.va_flags = SCARG(uap, flags); 1451 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1452 } 1453 VOP_UNLOCK(vp); 1454 return (error); 1455 } 1456 1457 /* 1458 * Change mode of a file given path name; this version follows links. 1459 */ 1460 /* ARGSUSED */ 1461 int 1462 sys_chmod(p, v, retval) 1463 struct proc *p; 1464 void *v; 1465 register_t *retval; 1466 { 1467 register struct sys_chmod_args /* { 1468 syscallarg(const char *) path; 1469 syscallarg(int) mode; 1470 } */ *uap = v; 1471 int error; 1472 struct nameidata nd; 1473 1474 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1475 if ((error = namei(&nd)) != 0) 1476 return (error); 1477 1478 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1479 1480 vrele(nd.ni_vp); 1481 return (error); 1482 } 1483 1484 /* 1485 * Change mode of a file given a file descriptor. 1486 */ 1487 /* ARGSUSED */ 1488 int 1489 sys_fchmod(p, v, retval) 1490 struct proc *p; 1491 void *v; 1492 register_t *retval; 1493 { 1494 register struct sys_fchmod_args /* { 1495 syscallarg(int) fd; 1496 syscallarg(int) mode; 1497 } */ *uap = v; 1498 struct file *fp; 1499 int error; 1500 1501 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1502 return (error); 1503 1504 return (change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p)); 1505 } 1506 1507 /* 1508 * Change mode of a file given path name; this version does not follow links. 1509 */ 1510 /* ARGSUSED */ 1511 int 1512 sys_lchmod(p, v, retval) 1513 struct proc *p; 1514 void *v; 1515 register_t *retval; 1516 { 1517 register struct sys_lchmod_args /* { 1518 syscallarg(const char *) path; 1519 syscallarg(int) mode; 1520 } */ *uap = v; 1521 int error; 1522 struct nameidata nd; 1523 1524 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1525 if ((error = namei(&nd)) != 0) 1526 return (error); 1527 1528 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1529 1530 vrele(nd.ni_vp); 1531 return (error); 1532 } 1533 1534 /* 1535 * Common routine to set mode given a vnode. 1536 */ 1537 static int 1538 change_mode(vp, mode, p) 1539 struct vnode *vp; 1540 int mode; 1541 struct proc *p; 1542 { 1543 struct vattr vattr; 1544 int error; 1545 1546 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1547 VOP_LOCK(vp); 1548 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1549 error = EROFS; 1550 else { 1551 VATTR_NULL(&vattr); 1552 vattr.va_mode = mode & ALLPERMS; 1553 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1554 } 1555 VOP_UNLOCK(vp); 1556 return (error); 1557 } 1558 1559 /* 1560 * Set ownership given a path name; this version follows links. 1561 */ 1562 /* ARGSUSED */ 1563 int 1564 sys_chown(p, v, retval) 1565 struct proc *p; 1566 void *v; 1567 register_t *retval; 1568 { 1569 register struct sys_chown_args /* { 1570 syscallarg(const char *) path; 1571 syscallarg(uid_t) uid; 1572 syscallarg(gid_t) gid; 1573 } */ *uap = v; 1574 int error; 1575 struct nameidata nd; 1576 1577 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1578 if ((error = namei(&nd)) != 0) 1579 return (error); 1580 1581 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p); 1582 1583 vrele(nd.ni_vp); 1584 return (error); 1585 } 1586 1587 /* 1588 * Set ownership given a file descriptor. 1589 */ 1590 /* ARGSUSED */ 1591 int 1592 sys_fchown(p, v, retval) 1593 struct proc *p; 1594 void *v; 1595 register_t *retval; 1596 { 1597 register struct sys_fchown_args /* { 1598 syscallarg(int) fd; 1599 syscallarg(uid_t) uid; 1600 syscallarg(gid_t) gid; 1601 } */ *uap = v; 1602 int error; 1603 struct file *fp; 1604 1605 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1606 return (error); 1607 1608 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1609 SCARG(uap, gid), p)); 1610 } 1611 1612 /* 1613 * Set ownership given a path name; this version does not follow links. 1614 */ 1615 /* ARGSUSED */ 1616 int 1617 sys_lchown(p, v, retval) 1618 struct proc *p; 1619 void *v; 1620 register_t *retval; 1621 { 1622 register struct sys_lchown_args /* { 1623 syscallarg(const char *) path; 1624 syscallarg(uid_t) uid; 1625 syscallarg(gid_t) gid; 1626 } */ *uap = v; 1627 int error; 1628 struct nameidata nd; 1629 1630 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1631 if ((error = namei(&nd)) != 0) 1632 return (error); 1633 1634 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p); 1635 1636 vrele(nd.ni_vp); 1637 return (error); 1638 } 1639 1640 /* 1641 * Common routine to set ownership given a vnode. 1642 */ 1643 static int 1644 change_owner(vp, uid, gid, p) 1645 register struct vnode *vp; 1646 uid_t uid; 1647 gid_t gid; 1648 struct proc *p; 1649 { 1650 struct vattr vattr; 1651 mode_t newmode = VNOVAL; 1652 int error; 1653 1654 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1655 VOP_LOCK(vp); 1656 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 1657 error = EROFS; 1658 goto out; 1659 } 1660 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 1661 goto out; 1662 1663 /* Clear (S_ISUID | S_ISGID) bits: alter va_mode only if necessary. */ 1664 if (vattr.va_mode & (S_ISUID | S_ISGID)) 1665 newmode = vattr.va_mode & ~(S_ISUID | S_ISGID); 1666 1667 VATTR_NULL(&vattr); 1668 vattr.va_uid = uid; 1669 vattr.va_gid = gid; 1670 vattr.va_mode = newmode; 1671 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1672 1673 out: 1674 VOP_UNLOCK(vp); 1675 return (error); 1676 } 1677 1678 /* 1679 * Set the access and modification times given a path name; this 1680 * version follows links. 1681 */ 1682 /* ARGSUSED */ 1683 int 1684 sys_utimes(p, v, retval) 1685 struct proc *p; 1686 void *v; 1687 register_t *retval; 1688 { 1689 register struct sys_utimes_args /* { 1690 syscallarg(const char *) path; 1691 syscallarg(const struct timeval *) tptr; 1692 } */ *uap = v; 1693 int error; 1694 struct nameidata nd; 1695 1696 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1697 if ((error = namei(&nd)) != 0) 1698 return (error); 1699 1700 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1701 1702 vrele(nd.ni_vp); 1703 return (error); 1704 } 1705 1706 /* 1707 * Set the access and modification times given a file descriptor. 1708 */ 1709 /* ARGSUSED */ 1710 int 1711 sys_futimes(p, v, retval) 1712 struct proc *p; 1713 void *v; 1714 register_t *retval; 1715 { 1716 register struct sys_futimes_args /* { 1717 syscallarg(int) fd; 1718 syscallarg(const struct timeval *) tptr; 1719 } */ *uap = v; 1720 int error; 1721 struct file *fp; 1722 1723 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1724 return (error); 1725 1726 return (change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), 1727 p)); 1728 } 1729 1730 /* 1731 * Set the access and modification times given a path name; this 1732 * version does not follow links. 1733 */ 1734 /* ARGSUSED */ 1735 int 1736 sys_lutimes(p, v, retval) 1737 struct proc *p; 1738 void *v; 1739 register_t *retval; 1740 { 1741 register struct sys_lutimes_args /* { 1742 syscallarg(const char *) path; 1743 syscallarg(const struct timeval *) tptr; 1744 } */ *uap = v; 1745 int error; 1746 struct nameidata nd; 1747 1748 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1749 if ((error = namei(&nd)) != 0) 1750 return (error); 1751 1752 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1753 1754 vrele(nd.ni_vp); 1755 return (error); 1756 } 1757 1758 /* 1759 * Common routine to set access and modification times given a vnode. 1760 */ 1761 static int 1762 change_utimes(vp, tptr, p) 1763 struct vnode *vp; 1764 const struct timeval *tptr; 1765 struct proc *p; 1766 { 1767 struct timeval tv[2]; 1768 struct vattr vattr; 1769 int error; 1770 1771 VATTR_NULL(&vattr); 1772 if (tptr == NULL) { 1773 microtime(&tv[0]); 1774 tv[1] = tv[0]; 1775 vattr.va_vaflags |= VA_UTIMES_NULL; 1776 } else { 1777 error = copyin(tptr, tv, sizeof (tv)); 1778 if (error) 1779 return (error); 1780 } 1781 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1782 VOP_LOCK(vp); 1783 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1784 error = EROFS; 1785 else { 1786 vattr.va_atime.tv_sec = tv[0].tv_sec; 1787 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1788 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1789 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1790 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1791 } 1792 VOP_UNLOCK(vp); 1793 return (error); 1794 } 1795 1796 /* 1797 * Truncate a file given its path name. 1798 */ 1799 /* ARGSUSED */ 1800 int 1801 sys_truncate(p, v, retval) 1802 struct proc *p; 1803 void *v; 1804 register_t *retval; 1805 { 1806 register struct sys_truncate_args /* { 1807 syscallarg(const char *) path; 1808 syscallarg(int) pad; 1809 syscallarg(off_t) length; 1810 } */ *uap = v; 1811 register struct vnode *vp; 1812 struct vattr vattr; 1813 int error; 1814 struct nameidata nd; 1815 1816 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1817 if ((error = namei(&nd)) != 0) 1818 return (error); 1819 vp = nd.ni_vp; 1820 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1821 VOP_LOCK(vp); 1822 if (vp->v_type == VDIR) 1823 error = EISDIR; 1824 else if ((error = vn_writechk(vp)) == 0 && 1825 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1826 VATTR_NULL(&vattr); 1827 vattr.va_size = SCARG(uap, length); 1828 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1829 } 1830 vput(vp); 1831 return (error); 1832 } 1833 1834 /* 1835 * Truncate a file given a file descriptor. 1836 */ 1837 /* ARGSUSED */ 1838 int 1839 sys_ftruncate(p, v, retval) 1840 struct proc *p; 1841 void *v; 1842 register_t *retval; 1843 { 1844 register struct sys_ftruncate_args /* { 1845 syscallarg(int) fd; 1846 syscallarg(int) pad; 1847 syscallarg(off_t) length; 1848 } */ *uap = v; 1849 struct vattr vattr; 1850 struct vnode *vp; 1851 struct file *fp; 1852 int error; 1853 1854 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1855 return (error); 1856 if ((fp->f_flag & FWRITE) == 0) 1857 return (EINVAL); 1858 vp = (struct vnode *)fp->f_data; 1859 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1860 VOP_LOCK(vp); 1861 if (vp->v_type == VDIR) 1862 error = EISDIR; 1863 else if ((error = vn_writechk(vp)) == 0) { 1864 VATTR_NULL(&vattr); 1865 vattr.va_size = SCARG(uap, length); 1866 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1867 } 1868 VOP_UNLOCK(vp); 1869 return (error); 1870 } 1871 1872 /* 1873 * Sync an open file. 1874 */ 1875 /* ARGSUSED */ 1876 int 1877 sys_fsync(p, v, retval) 1878 struct proc *p; 1879 void *v; 1880 register_t *retval; 1881 { 1882 struct sys_fsync_args /* { 1883 syscallarg(int) fd; 1884 } */ *uap = v; 1885 register struct vnode *vp; 1886 struct file *fp; 1887 int error; 1888 1889 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1890 return (error); 1891 vp = (struct vnode *)fp->f_data; 1892 VOP_LOCK(vp); 1893 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p); 1894 VOP_UNLOCK(vp); 1895 return (error); 1896 } 1897 1898 /* 1899 * Rename files, (standard) BSD semantics frontend. 1900 */ 1901 /* ARGSUSED */ 1902 int 1903 sys_rename(p, v, retval) 1904 struct proc *p; 1905 void *v; 1906 register_t *retval; 1907 { 1908 register struct sys_rename_args /* { 1909 syscallarg(const char *) from; 1910 syscallarg(const char *) to; 1911 } */ *uap = v; 1912 1913 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 1914 } 1915 1916 /* 1917 * Rename files, POSIX semantics frontend. 1918 */ 1919 /* ARGSUSED */ 1920 int 1921 sys_posix_rename(p, v, retval) 1922 struct proc *p; 1923 void *v; 1924 register_t *retval; 1925 { 1926 register struct sys_posix_rename_args /* { 1927 syscallarg(const char *) from; 1928 syscallarg(const char *) to; 1929 } */ *uap = v; 1930 1931 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 1932 } 1933 1934 /* 1935 * Rename files. Source and destination must either both be directories, 1936 * or both not be directories. If target is a directory, it must be empty. 1937 * If `from' and `to' refer to the same object, the value of the `retain' 1938 * argument is used to determine whether `from' will be 1939 * 1940 * (retain == 0) deleted unless `from' and `to' refer to the same 1941 * object in the file system's name space (BSD). 1942 * (retain == 1) always retained (POSIX). 1943 */ 1944 static int 1945 rename_files(from, to, p, retain) 1946 const char *from, *to; 1947 struct proc *p; 1948 int retain; 1949 { 1950 register struct vnode *tvp, *fvp, *tdvp; 1951 struct nameidata fromnd, tond; 1952 int error; 1953 1954 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 1955 from, p); 1956 if ((error = namei(&fromnd)) != 0) 1957 return (error); 1958 fvp = fromnd.ni_vp; 1959 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 1960 UIO_USERSPACE, to, p); 1961 if ((error = namei(&tond)) != 0) { 1962 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1963 vrele(fromnd.ni_dvp); 1964 vrele(fvp); 1965 goto out1; 1966 } 1967 tdvp = tond.ni_dvp; 1968 tvp = tond.ni_vp; 1969 1970 if (tvp != NULL) { 1971 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 1972 error = ENOTDIR; 1973 goto out; 1974 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 1975 error = EISDIR; 1976 goto out; 1977 } 1978 } 1979 1980 if (fvp == tdvp) 1981 error = EINVAL; 1982 1983 /* 1984 * Source and destination refer to the same object. 1985 */ 1986 if (fvp == tvp) { 1987 if (retain) 1988 error = -1; 1989 else if (fromnd.ni_dvp == tdvp && 1990 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 1991 !bcmp(fromnd.ni_cnd.cn_nameptr, 1992 tond.ni_cnd.cn_nameptr, 1993 fromnd.ni_cnd.cn_namelen)) 1994 error = -1; 1995 } 1996 1997 out: 1998 if (!error) { 1999 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2000 if (fromnd.ni_dvp != tdvp) 2001 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2002 if (tvp) { 2003 (void)vnode_pager_uncache(tvp); 2004 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2005 } 2006 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2007 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2008 } else { 2009 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2010 if (tdvp == tvp) 2011 vrele(tdvp); 2012 else 2013 vput(tdvp); 2014 if (tvp) 2015 vput(tvp); 2016 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2017 vrele(fromnd.ni_dvp); 2018 vrele(fvp); 2019 } 2020 vrele(tond.ni_startdir); 2021 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2022 out1: 2023 if (fromnd.ni_startdir) 2024 vrele(fromnd.ni_startdir); 2025 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2026 return (error == -1 ? 0 : error); 2027 } 2028 2029 /* 2030 * Make a directory file. 2031 */ 2032 /* ARGSUSED */ 2033 int 2034 sys_mkdir(p, v, retval) 2035 struct proc *p; 2036 void *v; 2037 register_t *retval; 2038 { 2039 register struct sys_mkdir_args /* { 2040 syscallarg(const char *) path; 2041 syscallarg(int) mode; 2042 } */ *uap = v; 2043 register struct vnode *vp; 2044 struct vattr vattr; 2045 int error; 2046 struct nameidata nd; 2047 2048 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2049 if ((error = namei(&nd)) != 0) 2050 return (error); 2051 vp = nd.ni_vp; 2052 if (vp != NULL) { 2053 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2054 if (nd.ni_dvp == vp) 2055 vrele(nd.ni_dvp); 2056 else 2057 vput(nd.ni_dvp); 2058 vrele(vp); 2059 return (EEXIST); 2060 } 2061 VATTR_NULL(&vattr); 2062 vattr.va_type = VDIR; 2063 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 2064 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2065 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2066 if (!error) 2067 vput(nd.ni_vp); 2068 return (error); 2069 } 2070 2071 /* 2072 * Remove a directory file. 2073 */ 2074 /* ARGSUSED */ 2075 int 2076 sys_rmdir(p, v, retval) 2077 struct proc *p; 2078 void *v; 2079 register_t *retval; 2080 { 2081 struct sys_rmdir_args /* { 2082 syscallarg(const char *) path; 2083 } */ *uap = v; 2084 register struct vnode *vp; 2085 int error; 2086 struct nameidata nd; 2087 2088 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2089 SCARG(uap, path), p); 2090 if ((error = namei(&nd)) != 0) 2091 return (error); 2092 vp = nd.ni_vp; 2093 if (vp->v_type != VDIR) { 2094 error = ENOTDIR; 2095 goto out; 2096 } 2097 /* 2098 * No rmdir "." please. 2099 */ 2100 if (nd.ni_dvp == vp) { 2101 error = EINVAL; 2102 goto out; 2103 } 2104 /* 2105 * The root of a mounted filesystem cannot be deleted. 2106 */ 2107 if (vp->v_flag & VROOT) 2108 error = EBUSY; 2109 out: 2110 if (!error) { 2111 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2112 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2113 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2114 } else { 2115 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2116 if (nd.ni_dvp == vp) 2117 vrele(nd.ni_dvp); 2118 else 2119 vput(nd.ni_dvp); 2120 vput(vp); 2121 } 2122 return (error); 2123 } 2124 2125 /* 2126 * Read a block of directory entries in a file system independent format. 2127 */ 2128 int 2129 sys_getdirentries(p, v, retval) 2130 struct proc *p; 2131 void *v; 2132 register_t *retval; 2133 { 2134 register struct sys_getdirentries_args /* { 2135 syscallarg(int) fd; 2136 syscallarg(char *) buf; 2137 syscallarg(u_int) count; 2138 syscallarg(long *) basep; 2139 } */ *uap = v; 2140 register struct vnode *vp; 2141 struct file *fp; 2142 struct uio auio; 2143 struct iovec aiov; 2144 long loff; 2145 int error, eofflag; 2146 2147 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2148 return (error); 2149 if ((fp->f_flag & FREAD) == 0) 2150 return (EBADF); 2151 vp = (struct vnode *)fp->f_data; 2152 unionread: 2153 if (vp->v_type != VDIR) 2154 return (EINVAL); 2155 aiov.iov_base = SCARG(uap, buf); 2156 aiov.iov_len = SCARG(uap, count); 2157 auio.uio_iov = &aiov; 2158 auio.uio_iovcnt = 1; 2159 auio.uio_rw = UIO_READ; 2160 auio.uio_segflg = UIO_USERSPACE; 2161 auio.uio_procp = p; 2162 auio.uio_resid = SCARG(uap, count); 2163 VOP_LOCK(vp); 2164 loff = auio.uio_offset = fp->f_offset; 2165 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, (u_long *)0, 0); 2166 fp->f_offset = auio.uio_offset; 2167 VOP_UNLOCK(vp); 2168 if (error) 2169 return (error); 2170 2171 #ifdef UNION 2172 { 2173 extern int (**union_vnodeop_p) __P((void *)); 2174 extern struct vnode *union_dircache __P((struct vnode *)); 2175 2176 if ((SCARG(uap, count) == auio.uio_resid) && 2177 (vp->v_op == union_vnodeop_p)) { 2178 struct vnode *lvp; 2179 2180 lvp = union_dircache(vp); 2181 if (lvp != NULLVP) { 2182 struct vattr va; 2183 2184 /* 2185 * If the directory is opaque, 2186 * then don't show lower entries 2187 */ 2188 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 2189 if (va.va_flags & OPAQUE) { 2190 vput(lvp); 2191 lvp = NULL; 2192 } 2193 } 2194 2195 if (lvp != NULLVP) { 2196 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 2197 VOP_UNLOCK(lvp); 2198 2199 if (error) { 2200 vrele(lvp); 2201 return (error); 2202 } 2203 fp->f_data = (caddr_t) lvp; 2204 fp->f_offset = 0; 2205 error = vn_close(vp, FREAD, fp->f_cred, p); 2206 if (error) 2207 return (error); 2208 vp = lvp; 2209 goto unionread; 2210 } 2211 } 2212 } 2213 #endif /* UNION */ 2214 2215 if ((SCARG(uap, count) == auio.uio_resid) && 2216 (vp->v_flag & VROOT) && 2217 (vp->v_mount->mnt_flag & MNT_UNION)) { 2218 struct vnode *tvp = vp; 2219 vp = vp->v_mount->mnt_vnodecovered; 2220 VREF(vp); 2221 fp->f_data = (caddr_t) vp; 2222 fp->f_offset = 0; 2223 vrele(tvp); 2224 goto unionread; 2225 } 2226 error = copyout(&loff, SCARG(uap, basep), sizeof(long)); 2227 *retval = SCARG(uap, count) - auio.uio_resid; 2228 return (error); 2229 } 2230 2231 /* 2232 * Set the mode mask for creation of filesystem nodes. 2233 */ 2234 int 2235 sys_umask(p, v, retval) 2236 struct proc *p; 2237 void *v; 2238 register_t *retval; 2239 { 2240 struct sys_umask_args /* { 2241 syscallarg(int) newmask; 2242 } */ *uap = v; 2243 register struct filedesc *fdp; 2244 2245 fdp = p->p_fd; 2246 *retval = fdp->fd_cmask; 2247 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2248 return (0); 2249 } 2250 2251 /* 2252 * Void all references to file by ripping underlying filesystem 2253 * away from vnode. 2254 */ 2255 /* ARGSUSED */ 2256 int 2257 sys_revoke(p, v, retval) 2258 struct proc *p; 2259 void *v; 2260 register_t *retval; 2261 { 2262 register struct sys_revoke_args /* { 2263 syscallarg(const char *) path; 2264 } */ *uap = v; 2265 register struct vnode *vp; 2266 struct vattr vattr; 2267 int error; 2268 struct nameidata nd; 2269 2270 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2271 if ((error = namei(&nd)) != 0) 2272 return (error); 2273 vp = nd.ni_vp; 2274 if (vp->v_type != VCHR && vp->v_type != VBLK) { 2275 error = EINVAL; 2276 goto out; 2277 } 2278 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2279 goto out; 2280 if (p->p_ucred->cr_uid != vattr.va_uid && 2281 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2282 goto out; 2283 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2284 vgoneall(vp); 2285 out: 2286 vrele(vp); 2287 return (error); 2288 } 2289 2290 /* 2291 * Convert a user file descriptor to a kernel file entry. 2292 */ 2293 int 2294 getvnode(fdp, fd, fpp) 2295 struct filedesc *fdp; 2296 int fd; 2297 struct file **fpp; 2298 { 2299 struct vnode *vp; 2300 struct file *fp; 2301 2302 if ((u_int)fd >= fdp->fd_nfiles || 2303 (fp = fdp->fd_ofiles[fd]) == NULL) 2304 return (EBADF); 2305 if (fp->f_type != DTYPE_VNODE) 2306 return (EINVAL); 2307 vp = (struct vnode *)fp->f_data; 2308 if (vp->v_type == VBAD) 2309 return (EBADF); 2310 *fpp = fp; 2311 return (0); 2312 } 2313
Indexes created Wed Sep 24 22:09:59 GMT 2025