vfs_syscalls.c revision 1.103
1 /* $NetBSD: vfs_syscalls.c,v 1.103 1997/10/19 03:29:20 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/namei.h> 46 #include <sys/filedesc.h> 47 #include <sys/kernel.h> 48 #include <sys/file.h> 49 #include <sys/stat.h> 50 #include <sys/vnode.h> 51 #include <sys/mount.h> 52 #include <sys/proc.h> 53 #include <sys/uio.h> 54 #include <sys/malloc.h> 55 #include <sys/dirent.h> 56 57 #include <sys/syscallargs.h> 58 59 #include <vm/vm.h> 60 #include <sys/sysctl.h> 61 62 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 u_long fsindex = 0; 126 char fstypename[MFSNAMELEN]; 127 struct vattr va; 128 struct nameidata nd; 129 130 /* 131 * Get vnode to be covered 132 */ 133 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 134 SCARG(uap, path), p); 135 if ((error = namei(&nd)) != 0) 136 return (error); 137 vp = nd.ni_vp; 138 if (SCARG(uap, flags) & MNT_UPDATE) { 139 if ((vp->v_flag & VROOT) == 0) { 140 vput(vp); 141 return (EINVAL); 142 } 143 mp = vp->v_mount; 144 flag = mp->mnt_flag; 145 /* 146 * We only allow the filesystem to be reloaded if it 147 * is currently mounted read-only. 148 */ 149 if ((SCARG(uap, flags) & MNT_RELOAD) && 150 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 151 vput(vp); 152 return (EOPNOTSUPP); /* Needs translation */ 153 } 154 mp->mnt_flag |= 155 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 156 /* 157 * Only root, or the user that did the original mount is 158 * permitted to update it. 159 */ 160 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 161 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 162 vput(vp); 163 return (error); 164 } 165 /* 166 * Do not allow NFS export by non-root users. Silently 167 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 168 */ 169 if (p->p_ucred->cr_uid != 0) { 170 if (SCARG(uap, flags) & MNT_EXPORTED) { 171 vput(vp); 172 return (EPERM); 173 } 174 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 175 } 176 VOP_UNLOCK(vp); 177 goto update; 178 } 179 /* 180 * If the user is not root, ensure that they own the directory 181 * onto which we are attempting to mount. 182 */ 183 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 184 (va.va_uid != p->p_ucred->cr_uid && 185 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 186 vput(vp); 187 return (error); 188 } 189 /* 190 * Do not allow NFS export by non-root users. Silently 191 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 192 */ 193 if (p->p_ucred->cr_uid != 0) { 194 if (SCARG(uap, flags) & MNT_EXPORTED) { 195 vput(vp); 196 return (EPERM); 197 } 198 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 199 } 200 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 201 return (error); 202 if (vp->v_type != VDIR) { 203 vput(vp); 204 return (ENOTDIR); 205 } 206 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 207 if (error) { 208 #if defined(COMPAT_09) || defined(COMPAT_43) 209 /* 210 * Historically filesystem types were identified by number. 211 * If we get an integer for the filesystem type instead of a 212 * string, we check to see if it matches one of the historic 213 * filesystem types. 214 */ 215 fsindex = (u_long)SCARG(uap, type); 216 if (fsindex >= nmountcompatnames || 217 mountcompatnames[fsindex] == NULL) { 218 vput(vp); 219 return (ENODEV); 220 } 221 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 222 #else 223 vput(vp); 224 return (error); 225 #endif 226 } 227 #ifdef COMPAT_10 228 /* Accept `ufs' as an alias for `ffs'. */ 229 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 230 strncpy(fstypename, "ffs", MFSNAMELEN); 231 #endif 232 for (fsindex = 0; fsindex < nvfssw; fsindex++) 233 if (vfssw[fsindex] != NULL && 234 !strncmp(vfssw[fsindex]->vfs_name, fstypename, MFSNAMELEN)) 235 break; 236 if (fsindex >= nvfssw) { 237 vput(vp); 238 return (ENODEV); 239 } 240 if (vp->v_mountedhere != NULL) { 241 vput(vp); 242 return (EBUSY); 243 } 244 245 /* 246 * Allocate and initialize the file system. 247 */ 248 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 249 M_MOUNT, M_WAITOK); 250 bzero((char *)mp, (u_long)sizeof(struct mount)); 251 mp->mnt_op = vfssw[fsindex]; 252 if ((error = vfs_lock(mp)) != 0) { 253 free((caddr_t)mp, M_MOUNT); 254 vput(vp); 255 return (error); 256 } 257 /* Do this early in case we block later. */ 258 vfssw[fsindex]->vfs_refcount++; 259 vp->v_mountedhere = mp; 260 mp->mnt_vnodecovered = vp; 261 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 262 update: 263 /* 264 * Set the mount level flags. 265 */ 266 if (SCARG(uap, flags) & MNT_RDONLY) 267 mp->mnt_flag |= MNT_RDONLY; 268 else if (mp->mnt_flag & MNT_RDONLY) 269 mp->mnt_flag |= MNT_WANTRDWR; 270 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 271 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 272 MNT_NOATIME); 273 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 274 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 275 MNT_NOCOREDUMP | MNT_NOATIME); 276 /* 277 * Mount the filesystem. 278 */ 279 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 280 if (mp->mnt_flag & MNT_UPDATE) { 281 vrele(vp); 282 if (mp->mnt_flag & MNT_WANTRDWR) 283 mp->mnt_flag &= ~MNT_RDONLY; 284 mp->mnt_flag &=~ 285 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 286 if (error) 287 mp->mnt_flag = flag; 288 return (error); 289 } 290 /* 291 * Put the new filesystem on the mount list after root. 292 */ 293 cache_purge(vp); 294 if (!error) { 295 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 296 checkdirs(vp); 297 VOP_UNLOCK(vp); 298 vfs_unlock(mp); 299 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 300 error = VFS_START(mp, 0, p); 301 } else { 302 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 303 vfssw[fsindex]->vfs_refcount--; 304 vfs_unlock(mp); 305 free((caddr_t)mp, M_MOUNT); 306 vput(vp); 307 } 308 return (error); 309 } 310 311 /* 312 * Scan all active processes to see if any of them have a current 313 * or root directory onto which the new filesystem has just been 314 * mounted. If so, replace them with the new mount point. 315 */ 316 void 317 checkdirs(olddp) 318 struct vnode *olddp; 319 { 320 struct filedesc *fdp; 321 struct vnode *newdp; 322 struct proc *p; 323 324 if (olddp->v_usecount == 1) 325 return; 326 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 327 panic("mount: lost mount"); 328 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 329 fdp = p->p_fd; 330 if (fdp->fd_cdir == olddp) { 331 vrele(fdp->fd_cdir); 332 VREF(newdp); 333 fdp->fd_cdir = newdp; 334 } 335 if (fdp->fd_rdir == olddp) { 336 vrele(fdp->fd_rdir); 337 VREF(newdp); 338 fdp->fd_rdir = newdp; 339 } 340 } 341 if (rootvnode == olddp) { 342 vrele(rootvnode); 343 VREF(newdp); 344 rootvnode = newdp; 345 } 346 vput(newdp); 347 } 348 349 /* 350 * Unmount a file system. 351 * 352 * Note: unmount takes a path to the vnode mounted on as argument, 353 * not special file (as before). 354 */ 355 /* ARGSUSED */ 356 int 357 sys_unmount(p, v, retval) 358 struct proc *p; 359 void *v; 360 register_t *retval; 361 { 362 register struct sys_unmount_args /* { 363 syscallarg(const char *) path; 364 syscallarg(int) flags; 365 } */ *uap = v; 366 register struct vnode *vp; 367 struct mount *mp; 368 int error; 369 struct nameidata nd; 370 371 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 372 SCARG(uap, path), p); 373 if ((error = namei(&nd)) != 0) 374 return (error); 375 vp = nd.ni_vp; 376 mp = vp->v_mount; 377 378 /* 379 * Only root, or the user that did the original mount is 380 * permitted to unmount this filesystem. 381 */ 382 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 383 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 384 vput(vp); 385 return (error); 386 } 387 388 /* 389 * Don't allow unmounting the root file system. 390 */ 391 if (mp->mnt_flag & MNT_ROOTFS) { 392 vput(vp); 393 return (EINVAL); 394 } 395 396 /* 397 * Must be the root of the filesystem 398 */ 399 if ((vp->v_flag & VROOT) == 0) { 400 vput(vp); 401 return (EINVAL); 402 } 403 vput(vp); 404 405 if (vfs_busy(mp)) 406 return (EBUSY); 407 408 return (dounmount(mp, SCARG(uap, flags), p)); 409 } 410 411 /* 412 * Do the actual file system unmount. File system is assumed to have been 413 * marked busy by the caller. 414 */ 415 int 416 dounmount(mp, flags, p) 417 register struct mount *mp; 418 int flags; 419 struct proc *p; 420 { 421 struct vnode *coveredvp; 422 int error; 423 424 coveredvp = mp->mnt_vnodecovered; 425 mp->mnt_flag |= MNT_UNMOUNT; 426 if ((error = vfs_lock(mp)) != 0) { 427 vfs_unbusy(mp); 428 return (error); 429 } 430 431 if (mp->mnt_flag & MNT_EXPUBLIC) 432 vfs_setpublicfs(NULL, NULL, NULL); 433 434 mp->mnt_flag &=~ MNT_ASYNC; 435 vnode_pager_umount(mp); /* release cached vnodes */ 436 cache_purgevfs(mp); /* remove cache entries for this file sys */ 437 if ((error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0 || 438 (flags & MNT_FORCE)) 439 error = VFS_UNMOUNT(mp, flags, p); 440 mp->mnt_flag &= ~MNT_UNMOUNT; 441 vfs_unbusy(mp); 442 if (error) { 443 vfs_unlock(mp); 444 } else { 445 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 446 if (coveredvp != NULLVP) { 447 vrele(coveredvp); 448 coveredvp->v_mountedhere = (struct mount *)0; 449 } 450 mp->mnt_op->vfs_refcount--; 451 vfs_unlock(mp); 452 if (mp->mnt_vnodelist.lh_first != NULL) 453 panic("unmount: dangling vnode"); 454 free((caddr_t)mp, M_MOUNT); 455 } 456 return (error); 457 } 458 459 /* 460 * Sync each mounted filesystem. 461 */ 462 #ifdef DEBUG 463 int syncprt = 0; 464 struct ctldebug debug0 = { "syncprt", &syncprt }; 465 #endif 466 467 /* ARGSUSED */ 468 int 469 sys_sync(p, v, retval) 470 struct proc *p; 471 void *v; 472 register_t *retval; 473 { 474 register struct mount *mp, *nmp; 475 int asyncflag; 476 477 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 478 /* 479 * Get the prev pointer in case we hang on vfs_busy 480 * while we are being unmounted. 481 */ 482 nmp = mp->mnt_list.cqe_prev; 483 /* 484 * The lock check below is to avoid races with mount 485 * and unmount. 486 */ 487 if ((mp->mnt_flag & (MNT_MLOCK|MNT_RDONLY|MNT_MPBUSY)) == 0 && 488 !vfs_busy(mp)) { 489 asyncflag = mp->mnt_flag & MNT_ASYNC; 490 mp->mnt_flag &= ~MNT_ASYNC; 491 vnode_pager_sync(mp); 492 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 493 if (asyncflag) 494 mp->mnt_flag |= MNT_ASYNC; 495 /* 496 * Get the prev pointer again, as the prior filesystem 497 * might have been unmounted while we were sync'ing. 498 */ 499 nmp = mp->mnt_list.cqe_prev; 500 vfs_unbusy(mp); 501 } 502 } 503 #ifdef DEBUG 504 if (syncprt) 505 vfs_bufstats(); 506 #endif /* DEBUG */ 507 return (0); 508 } 509 510 /* 511 * Change filesystem quotas. 512 */ 513 /* ARGSUSED */ 514 int 515 sys_quotactl(p, v, retval) 516 struct proc *p; 517 void *v; 518 register_t *retval; 519 { 520 register struct sys_quotactl_args /* { 521 syscallarg(const char *) path; 522 syscallarg(int) cmd; 523 syscallarg(int) uid; 524 syscallarg(caddr_t) arg; 525 } */ *uap = v; 526 register struct mount *mp; 527 int error; 528 struct nameidata nd; 529 530 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 531 if ((error = namei(&nd)) != 0) 532 return (error); 533 mp = nd.ni_vp->v_mount; 534 vrele(nd.ni_vp); 535 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 536 SCARG(uap, arg), p)); 537 } 538 539 /* 540 * Get filesystem statistics. 541 */ 542 /* ARGSUSED */ 543 int 544 sys_statfs(p, v, retval) 545 struct proc *p; 546 void *v; 547 register_t *retval; 548 { 549 register struct sys_statfs_args /* { 550 syscallarg(const char *) path; 551 syscallarg(struct statfs *) buf; 552 } */ *uap = v; 553 register struct mount *mp; 554 register struct statfs *sp; 555 int error; 556 struct nameidata nd; 557 558 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 559 if ((error = namei(&nd)) != 0) 560 return (error); 561 mp = nd.ni_vp->v_mount; 562 sp = &mp->mnt_stat; 563 vrele(nd.ni_vp); 564 if ((error = VFS_STATFS(mp, sp, p)) != 0) 565 return (error); 566 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 567 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 568 } 569 570 /* 571 * Get filesystem statistics. 572 */ 573 /* ARGSUSED */ 574 int 575 sys_fstatfs(p, v, retval) 576 struct proc *p; 577 void *v; 578 register_t *retval; 579 { 580 register struct sys_fstatfs_args /* { 581 syscallarg(int) fd; 582 syscallarg(struct statfs *) buf; 583 } */ *uap = v; 584 struct file *fp; 585 struct mount *mp; 586 register struct statfs *sp; 587 int error; 588 589 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 590 return (error); 591 mp = ((struct vnode *)fp->f_data)->v_mount; 592 sp = &mp->mnt_stat; 593 if ((error = VFS_STATFS(mp, sp, p)) != 0) 594 return (error); 595 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 596 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 597 } 598 599 /* 600 * Get statistics on all filesystems. 601 */ 602 int 603 sys_getfsstat(p, v, retval) 604 struct proc *p; 605 void *v; 606 register_t *retval; 607 { 608 register struct sys_getfsstat_args /* { 609 syscallarg(struct statfs *) buf; 610 syscallarg(long) bufsize; 611 syscallarg(int) flags; 612 } */ *uap = v; 613 register struct mount *mp, *nmp; 614 register struct statfs *sp; 615 caddr_t sfsp; 616 long count, maxcount, error; 617 618 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 619 sfsp = (caddr_t)SCARG(uap, buf); 620 for (count = 0, 621 mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 622 nmp = mp->mnt_list.cqe_next; 623 if (sfsp && count < maxcount && 624 ((mp->mnt_flag & MNT_MLOCK) == 0)) { 625 sp = &mp->mnt_stat; 626 /* 627 * If MNT_NOWAIT is specified, do not refresh the 628 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 629 */ 630 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 631 (SCARG(uap, flags) & MNT_WAIT)) && 632 (error = VFS_STATFS(mp, sp, p)) != 0) 633 continue; 634 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 635 error = copyout(sp, sfsp, sizeof(*sp)); 636 if (error) 637 return (error); 638 sfsp += sizeof(*sp); 639 } 640 count++; 641 } 642 if (sfsp && count > maxcount) 643 *retval = maxcount; 644 else 645 *retval = count; 646 return (0); 647 } 648 649 /* 650 * Change current working directory to a given file descriptor. 651 */ 652 /* ARGSUSED */ 653 int 654 sys_fchdir(p, v, retval) 655 struct proc *p; 656 void *v; 657 register_t *retval; 658 { 659 struct sys_fchdir_args /* { 660 syscallarg(int) fd; 661 } */ *uap = v; 662 register struct filedesc *fdp = p->p_fd; 663 struct vnode *vp, *tdp; 664 struct mount *mp; 665 struct file *fp; 666 int error; 667 668 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 669 return (error); 670 vp = (struct vnode *)fp->f_data; 671 VREF(vp); 672 VOP_LOCK(vp); 673 if (vp->v_type != VDIR) 674 error = ENOTDIR; 675 else 676 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 677 while (!error && (mp = vp->v_mountedhere) != NULL) { 678 if (mp->mnt_flag & MNT_MLOCK) { 679 mp->mnt_flag |= MNT_MWAIT; 680 sleep((caddr_t)mp, PVFS); 681 continue; 682 } 683 if ((error = VFS_ROOT(mp, &tdp)) != 0) 684 break; 685 vput(vp); 686 vp = tdp; 687 } 688 VOP_UNLOCK(vp); 689 if (error) { 690 vrele(vp); 691 return (error); 692 } 693 vrele(fdp->fd_cdir); 694 fdp->fd_cdir = vp; 695 return (0); 696 } 697 698 /* 699 * Change current working directory (``.''). 700 */ 701 /* ARGSUSED */ 702 int 703 sys_chdir(p, v, retval) 704 struct proc *p; 705 void *v; 706 register_t *retval; 707 { 708 struct sys_chdir_args /* { 709 syscallarg(const char *) path; 710 } */ *uap = v; 711 register struct filedesc *fdp = p->p_fd; 712 int error; 713 struct nameidata nd; 714 715 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 716 SCARG(uap, path), p); 717 if ((error = change_dir(&nd, p)) != 0) 718 return (error); 719 vrele(fdp->fd_cdir); 720 fdp->fd_cdir = nd.ni_vp; 721 return (0); 722 } 723 724 /* 725 * Change notion of root (``/'') directory. 726 */ 727 /* ARGSUSED */ 728 int 729 sys_chroot(p, v, retval) 730 struct proc *p; 731 void *v; 732 register_t *retval; 733 { 734 struct sys_chroot_args /* { 735 syscallarg(const char *) path; 736 } */ *uap = v; 737 register struct filedesc *fdp = p->p_fd; 738 int error; 739 struct nameidata nd; 740 741 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 742 return (error); 743 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 744 SCARG(uap, path), p); 745 if ((error = change_dir(&nd, p)) != 0) 746 return (error); 747 if (fdp->fd_rdir != NULL) 748 vrele(fdp->fd_rdir); 749 fdp->fd_rdir = nd.ni_vp; 750 return (0); 751 } 752 753 /* 754 * Common routine for chroot and chdir. 755 */ 756 static int 757 change_dir(ndp, p) 758 register struct nameidata *ndp; 759 struct proc *p; 760 { 761 struct vnode *vp; 762 int error; 763 764 if ((error = namei(ndp)) != 0) 765 return (error); 766 vp = ndp->ni_vp; 767 if (vp->v_type != VDIR) 768 error = ENOTDIR; 769 else 770 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 771 VOP_UNLOCK(vp); 772 if (error) 773 vrele(vp); 774 return (error); 775 } 776 777 /* 778 * Check permissions, allocate an open file structure, 779 * and call the device open routine if any. 780 */ 781 int 782 sys_open(p, v, retval) 783 struct proc *p; 784 void *v; 785 register_t *retval; 786 { 787 register struct sys_open_args /* { 788 syscallarg(const char *) path; 789 syscallarg(int) flags; 790 syscallarg(int) mode; 791 } */ *uap = v; 792 register struct filedesc *fdp = p->p_fd; 793 register struct file *fp; 794 register struct vnode *vp; 795 int flags, cmode; 796 struct file *nfp; 797 int type, indx, error; 798 struct flock lf; 799 struct nameidata nd; 800 extern struct fileops vnops; 801 802 if ((error = falloc(p, &nfp, &indx)) != 0) 803 return (error); 804 fp = nfp; 805 flags = FFLAGS(SCARG(uap, flags)); 806 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 807 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 808 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 809 if ((error = vn_open(&nd, flags, cmode)) != 0) { 810 ffree(fp); 811 if ((error == ENODEV || error == ENXIO) && 812 p->p_dupfd >= 0 && /* XXX from fdopen */ 813 (error = 814 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 815 *retval = indx; 816 return (0); 817 } 818 if (error == ERESTART) 819 error = EINTR; 820 fdp->fd_ofiles[indx] = NULL; 821 return (error); 822 } 823 p->p_dupfd = 0; 824 vp = nd.ni_vp; 825 fp->f_flag = flags & FMASK; 826 fp->f_type = DTYPE_VNODE; 827 fp->f_ops = &vnops; 828 fp->f_data = (caddr_t)vp; 829 if (flags & (O_EXLOCK | O_SHLOCK)) { 830 lf.l_whence = SEEK_SET; 831 lf.l_start = 0; 832 lf.l_len = 0; 833 if (flags & O_EXLOCK) 834 lf.l_type = F_WRLCK; 835 else 836 lf.l_type = F_RDLCK; 837 type = F_FLOCK; 838 if ((flags & FNONBLOCK) == 0) 839 type |= F_WAIT; 840 VOP_UNLOCK(vp); 841 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 842 if (error) { 843 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 844 ffree(fp); 845 fdp->fd_ofiles[indx] = NULL; 846 return (error); 847 } 848 VOP_LOCK(vp); 849 fp->f_flag |= FHASLOCK; 850 } 851 VOP_UNLOCK(vp); 852 *retval = indx; 853 return (0); 854 } 855 856 /* 857 * Create a special file. 858 */ 859 /* ARGSUSED */ 860 int 861 sys_mknod(p, v, retval) 862 struct proc *p; 863 void *v; 864 register_t *retval; 865 { 866 register struct sys_mknod_args /* { 867 syscallarg(const char *) path; 868 syscallarg(int) mode; 869 syscallarg(int) dev; 870 } */ *uap = v; 871 register struct vnode *vp; 872 struct vattr vattr; 873 int error; 874 int whiteout = 0; 875 struct nameidata nd; 876 877 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 878 return (error); 879 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 880 if ((error = namei(&nd)) != 0) 881 return (error); 882 vp = nd.ni_vp; 883 if (vp != NULL) 884 error = EEXIST; 885 else { 886 VATTR_NULL(&vattr); 887 vattr.va_mode = 888 (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 889 vattr.va_rdev = SCARG(uap, dev); 890 whiteout = 0; 891 892 switch (SCARG(uap, mode) & S_IFMT) { 893 case S_IFMT: /* used by badsect to flag bad sectors */ 894 vattr.va_type = VBAD; 895 break; 896 case S_IFCHR: 897 vattr.va_type = VCHR; 898 break; 899 case S_IFBLK: 900 vattr.va_type = VBLK; 901 break; 902 case S_IFWHT: 903 whiteout = 1; 904 break; 905 default: 906 error = EINVAL; 907 break; 908 } 909 } 910 if (!error) { 911 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 912 if (whiteout) { 913 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 914 if (error) 915 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 916 vput(nd.ni_dvp); 917 } else { 918 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 919 &nd.ni_cnd, &vattr); 920 } 921 } else { 922 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 923 if (nd.ni_dvp == vp) 924 vrele(nd.ni_dvp); 925 else 926 vput(nd.ni_dvp); 927 if (vp) 928 vrele(vp); 929 } 930 return (error); 931 } 932 933 /* 934 * Create a named pipe. 935 */ 936 /* ARGSUSED */ 937 int 938 sys_mkfifo(p, v, retval) 939 struct proc *p; 940 void *v; 941 register_t *retval; 942 { 943 #ifndef FIFO 944 return (EOPNOTSUPP); 945 #else 946 register struct sys_mkfifo_args /* { 947 syscallarg(const char *) path; 948 syscallarg(int) mode; 949 } */ *uap = v; 950 struct vattr vattr; 951 int error; 952 struct nameidata nd; 953 954 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 955 if ((error = namei(&nd)) != 0) 956 return (error); 957 if (nd.ni_vp != NULL) { 958 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 959 if (nd.ni_dvp == nd.ni_vp) 960 vrele(nd.ni_dvp); 961 else 962 vput(nd.ni_dvp); 963 vrele(nd.ni_vp); 964 return (EEXIST); 965 } 966 VATTR_NULL(&vattr); 967 vattr.va_type = VFIFO; 968 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 969 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 970 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 971 #endif /* FIFO */ 972 } 973 974 /* 975 * Make a hard file link. 976 */ 977 /* ARGSUSED */ 978 int 979 sys_link(p, v, retval) 980 struct proc *p; 981 void *v; 982 register_t *retval; 983 { 984 register struct sys_link_args /* { 985 syscallarg(const char *) path; 986 syscallarg(const char *) link; 987 } */ *uap = v; 988 register struct vnode *vp; 989 struct nameidata nd; 990 int error; 991 992 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 993 if ((error = namei(&nd)) != 0) 994 return (error); 995 vp = nd.ni_vp; 996 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 997 if ((error = namei(&nd)) != 0) 998 goto out; 999 if (nd.ni_vp) { 1000 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1001 if (nd.ni_dvp == nd.ni_vp) 1002 vrele(nd.ni_dvp); 1003 else 1004 vput(nd.ni_dvp); 1005 vrele(nd.ni_vp); 1006 error = EEXIST; 1007 goto out; 1008 } 1009 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1010 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1011 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1012 out: 1013 vrele(vp); 1014 return (error); 1015 } 1016 1017 /* 1018 * Make a symbolic link. 1019 */ 1020 /* ARGSUSED */ 1021 int 1022 sys_symlink(p, v, retval) 1023 struct proc *p; 1024 void *v; 1025 register_t *retval; 1026 { 1027 register struct sys_symlink_args /* { 1028 syscallarg(const char *) path; 1029 syscallarg(const char *) link; 1030 } */ *uap = v; 1031 struct vattr vattr; 1032 char *path; 1033 int error; 1034 struct nameidata nd; 1035 1036 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1037 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1038 if (error) 1039 goto out; 1040 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1041 if ((error = namei(&nd)) != 0) 1042 goto out; 1043 if (nd.ni_vp) { 1044 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1045 if (nd.ni_dvp == nd.ni_vp) 1046 vrele(nd.ni_dvp); 1047 else 1048 vput(nd.ni_dvp); 1049 vrele(nd.ni_vp); 1050 error = EEXIST; 1051 goto out; 1052 } 1053 VATTR_NULL(&vattr); 1054 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1055 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1056 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1057 out: 1058 FREE(path, M_NAMEI); 1059 return (error); 1060 } 1061 1062 /* 1063 * Delete a whiteout from the filesystem. 1064 */ 1065 /* ARGSUSED */ 1066 int 1067 sys_undelete(p, v, retval) 1068 struct proc *p; 1069 void *v; 1070 register_t *retval; 1071 { 1072 register struct sys_undelete_args /* { 1073 syscallarg(const char *) path; 1074 } */ *uap = v; 1075 int error; 1076 struct nameidata nd; 1077 1078 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1079 SCARG(uap, path), p); 1080 error = namei(&nd); 1081 if (error) 1082 return (error); 1083 1084 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1085 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1086 if (nd.ni_dvp == nd.ni_vp) 1087 vrele(nd.ni_dvp); 1088 else 1089 vput(nd.ni_dvp); 1090 if (nd.ni_vp) 1091 vrele(nd.ni_vp); 1092 return (EEXIST); 1093 } 1094 1095 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1096 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1097 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1098 vput(nd.ni_dvp); 1099 return (error); 1100 } 1101 1102 /* 1103 * Delete a name from the filesystem. 1104 */ 1105 /* ARGSUSED */ 1106 int 1107 sys_unlink(p, v, retval) 1108 struct proc *p; 1109 void *v; 1110 register_t *retval; 1111 { 1112 struct sys_unlink_args /* { 1113 syscallarg(const char *) path; 1114 } */ *uap = v; 1115 register struct vnode *vp; 1116 int error; 1117 struct nameidata nd; 1118 1119 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1120 SCARG(uap, path), p); 1121 if ((error = namei(&nd)) != 0) 1122 return (error); 1123 vp = nd.ni_vp; 1124 1125 /* 1126 * The root of a mounted filesystem cannot be deleted. 1127 */ 1128 if (vp->v_flag & VROOT) { 1129 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1130 if (nd.ni_dvp == vp) 1131 vrele(nd.ni_dvp); 1132 else 1133 vput(nd.ni_dvp); 1134 vput(vp); 1135 error = EBUSY; 1136 goto out; 1137 } 1138 1139 (void)vnode_pager_uncache(vp); 1140 1141 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1142 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1143 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1144 out: 1145 return (error); 1146 } 1147 1148 /* 1149 * Reposition read/write file offset. 1150 */ 1151 int 1152 sys_lseek(p, v, retval) 1153 struct proc *p; 1154 void *v; 1155 register_t *retval; 1156 { 1157 register struct sys_lseek_args /* { 1158 syscallarg(int) fd; 1159 syscallarg(int) pad; 1160 syscallarg(off_t) offset; 1161 syscallarg(int) whence; 1162 } */ *uap = v; 1163 struct ucred *cred = p->p_ucred; 1164 register struct filedesc *fdp = p->p_fd; 1165 register struct file *fp; 1166 struct vnode *vp; 1167 struct vattr vattr; 1168 register off_t newoff; 1169 int error; 1170 1171 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1172 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1173 return (EBADF); 1174 1175 vp = (struct vnode *)fp->f_data; 1176 if (fp->f_type != DTYPE_VNODE 1177 #ifdef FIFO 1178 || vp->v_type == VFIFO 1179 #endif 1180 ) 1181 return (ESPIPE); 1182 1183 switch (SCARG(uap, whence)) { 1184 case SEEK_CUR: 1185 newoff = fp->f_offset + SCARG(uap, offset); 1186 break; 1187 case SEEK_END: 1188 error = VOP_GETATTR(vp, &vattr, cred, p); 1189 if (error) 1190 return (error); 1191 newoff = SCARG(uap, offset) + vattr.va_size; 1192 break; 1193 case SEEK_SET: 1194 newoff = SCARG(uap, offset); 1195 break; 1196 default: 1197 return (EINVAL); 1198 } 1199 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1200 return (error); 1201 1202 *(off_t *)retval = fp->f_offset = newoff; 1203 return (0); 1204 } 1205 1206 /* 1207 * Check access permissions. 1208 */ 1209 int 1210 sys_access(p, v, retval) 1211 struct proc *p; 1212 void *v; 1213 register_t *retval; 1214 { 1215 register struct sys_access_args /* { 1216 syscallarg(const char *) path; 1217 syscallarg(int) flags; 1218 } */ *uap = v; 1219 register struct ucred *cred = p->p_ucred; 1220 register struct vnode *vp; 1221 int error, flags, t_gid, t_uid; 1222 struct nameidata nd; 1223 1224 t_uid = cred->cr_uid; 1225 t_gid = cred->cr_gid; 1226 cred->cr_uid = p->p_cred->p_ruid; 1227 cred->cr_gid = p->p_cred->p_rgid; 1228 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1229 SCARG(uap, path), p); 1230 if ((error = namei(&nd)) != 0) 1231 goto out1; 1232 vp = nd.ni_vp; 1233 1234 /* Flags == 0 means only check for existence. */ 1235 if (SCARG(uap, flags)) { 1236 flags = 0; 1237 if (SCARG(uap, flags) & R_OK) 1238 flags |= VREAD; 1239 if (SCARG(uap, flags) & W_OK) 1240 flags |= VWRITE; 1241 if (SCARG(uap, flags) & X_OK) 1242 flags |= VEXEC; 1243 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1244 error = VOP_ACCESS(vp, flags, cred, p); 1245 } 1246 vput(vp); 1247 out1: 1248 cred->cr_uid = t_uid; 1249 cred->cr_gid = t_gid; 1250 return (error); 1251 } 1252 1253 /* 1254 * Get file status; this version follows links. 1255 */ 1256 /* ARGSUSED */ 1257 int 1258 sys_stat(p, v, retval) 1259 struct proc *p; 1260 void *v; 1261 register_t *retval; 1262 { 1263 register struct sys_stat_args /* { 1264 syscallarg(const char *) path; 1265 syscallarg(struct stat *) ub; 1266 } */ *uap = v; 1267 struct stat sb; 1268 int error; 1269 struct nameidata nd; 1270 1271 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1272 SCARG(uap, path), p); 1273 if ((error = namei(&nd)) != 0) 1274 return (error); 1275 error = vn_stat(nd.ni_vp, &sb, p); 1276 vput(nd.ni_vp); 1277 if (error) 1278 return (error); 1279 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1280 return (error); 1281 } 1282 1283 /* 1284 * Get file status; this version does not follow links. 1285 */ 1286 /* ARGSUSED */ 1287 int 1288 sys_lstat(p, v, retval) 1289 struct proc *p; 1290 void *v; 1291 register_t *retval; 1292 { 1293 register struct sys_lstat_args /* { 1294 syscallarg(const char *) path; 1295 syscallarg(struct stat *) ub; 1296 } */ *uap = v; 1297 struct stat sb; 1298 int error; 1299 struct nameidata nd; 1300 1301 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1302 SCARG(uap, path), p); 1303 if ((error = namei(&nd)) != 0) 1304 return (error); 1305 error = vn_stat(nd.ni_vp, &sb, p); 1306 vput(nd.ni_vp); 1307 if (error) 1308 return (error); 1309 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1310 return (error); 1311 } 1312 1313 /* 1314 * Get configurable pathname variables. 1315 */ 1316 /* ARGSUSED */ 1317 int 1318 sys_pathconf(p, v, retval) 1319 struct proc *p; 1320 void *v; 1321 register_t *retval; 1322 { 1323 register struct sys_pathconf_args /* { 1324 syscallarg(const char *) path; 1325 syscallarg(int) name; 1326 } */ *uap = v; 1327 int error; 1328 struct nameidata nd; 1329 1330 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1331 SCARG(uap, path), p); 1332 if ((error = namei(&nd)) != 0) 1333 return (error); 1334 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1335 vput(nd.ni_vp); 1336 return (error); 1337 } 1338 1339 /* 1340 * Return target name of a symbolic link. 1341 */ 1342 /* ARGSUSED */ 1343 int 1344 sys_readlink(p, v, retval) 1345 struct proc *p; 1346 void *v; 1347 register_t *retval; 1348 { 1349 register struct sys_readlink_args /* { 1350 syscallarg(const char *) path; 1351 syscallarg(char *) buf; 1352 syscallarg(int) count; 1353 } */ *uap = v; 1354 register struct vnode *vp; 1355 struct iovec aiov; 1356 struct uio auio; 1357 int error; 1358 struct nameidata nd; 1359 1360 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1361 SCARG(uap, path), p); 1362 if ((error = namei(&nd)) != 0) 1363 return (error); 1364 vp = nd.ni_vp; 1365 if (vp->v_type != VLNK) 1366 error = EINVAL; 1367 else if ((error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1368 aiov.iov_base = SCARG(uap, buf); 1369 aiov.iov_len = SCARG(uap, count); 1370 auio.uio_iov = &aiov; 1371 auio.uio_iovcnt = 1; 1372 auio.uio_offset = 0; 1373 auio.uio_rw = UIO_READ; 1374 auio.uio_segflg = UIO_USERSPACE; 1375 auio.uio_procp = p; 1376 auio.uio_resid = SCARG(uap, count); 1377 error = VOP_READLINK(vp, &auio, p->p_ucred); 1378 } 1379 vput(vp); 1380 *retval = SCARG(uap, count) - auio.uio_resid; 1381 return (error); 1382 } 1383 1384 /* 1385 * Change flags of a file given a path name. 1386 */ 1387 /* ARGSUSED */ 1388 int 1389 sys_chflags(p, v, retval) 1390 struct proc *p; 1391 void *v; 1392 register_t *retval; 1393 { 1394 register struct sys_chflags_args /* { 1395 syscallarg(const char *) path; 1396 syscallarg(u_long) flags; 1397 } */ *uap = v; 1398 register struct vnode *vp; 1399 struct vattr vattr; 1400 int error; 1401 struct nameidata nd; 1402 1403 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1404 if ((error = namei(&nd)) != 0) 1405 return (error); 1406 vp = nd.ni_vp; 1407 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1408 VOP_LOCK(vp); 1409 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1410 error = EROFS; 1411 else { 1412 VATTR_NULL(&vattr); 1413 vattr.va_flags = SCARG(uap, flags); 1414 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1415 } 1416 vput(vp); 1417 return (error); 1418 } 1419 1420 /* 1421 * Change flags of a file given a file descriptor. 1422 */ 1423 /* ARGSUSED */ 1424 int 1425 sys_fchflags(p, v, retval) 1426 struct proc *p; 1427 void *v; 1428 register_t *retval; 1429 { 1430 register struct sys_fchflags_args /* { 1431 syscallarg(int) fd; 1432 syscallarg(u_long) flags; 1433 } */ *uap = v; 1434 struct vattr vattr; 1435 struct vnode *vp; 1436 struct file *fp; 1437 int error; 1438 1439 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1440 return (error); 1441 vp = (struct vnode *)fp->f_data; 1442 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1443 VOP_LOCK(vp); 1444 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1445 error = EROFS; 1446 else { 1447 VATTR_NULL(&vattr); 1448 vattr.va_flags = SCARG(uap, flags); 1449 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1450 } 1451 VOP_UNLOCK(vp); 1452 return (error); 1453 } 1454 1455 /* 1456 * Change mode of a file given path name; this version follows links. 1457 */ 1458 /* ARGSUSED */ 1459 int 1460 sys_chmod(p, v, retval) 1461 struct proc *p; 1462 void *v; 1463 register_t *retval; 1464 { 1465 register struct sys_chmod_args /* { 1466 syscallarg(const char *) path; 1467 syscallarg(int) mode; 1468 } */ *uap = v; 1469 int error; 1470 struct nameidata nd; 1471 1472 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1473 if ((error = namei(&nd)) != 0) 1474 return (error); 1475 1476 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1477 1478 vrele(nd.ni_vp); 1479 return (error); 1480 } 1481 1482 /* 1483 * Change mode of a file given a file descriptor. 1484 */ 1485 /* ARGSUSED */ 1486 int 1487 sys_fchmod(p, v, retval) 1488 struct proc *p; 1489 void *v; 1490 register_t *retval; 1491 { 1492 register struct sys_fchmod_args /* { 1493 syscallarg(int) fd; 1494 syscallarg(int) mode; 1495 } */ *uap = v; 1496 struct file *fp; 1497 int error; 1498 1499 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1500 return (error); 1501 1502 return (change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p)); 1503 } 1504 1505 /* 1506 * Change mode of a file given path name; this version does not follow links. 1507 */ 1508 /* ARGSUSED */ 1509 int 1510 sys_lchmod(p, v, retval) 1511 struct proc *p; 1512 void *v; 1513 register_t *retval; 1514 { 1515 register struct sys_lchmod_args /* { 1516 syscallarg(const char *) path; 1517 syscallarg(int) mode; 1518 } */ *uap = v; 1519 int error; 1520 struct nameidata nd; 1521 1522 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1523 if ((error = namei(&nd)) != 0) 1524 return (error); 1525 1526 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1527 1528 vrele(nd.ni_vp); 1529 return (error); 1530 } 1531 1532 /* 1533 * Common routine to set mode given a vnode. 1534 */ 1535 static int 1536 change_mode(vp, mode, p) 1537 struct vnode *vp; 1538 int mode; 1539 struct proc *p; 1540 { 1541 struct vattr vattr; 1542 int error; 1543 1544 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1545 VOP_LOCK(vp); 1546 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1547 error = EROFS; 1548 else { 1549 VATTR_NULL(&vattr); 1550 vattr.va_mode = mode & ALLPERMS; 1551 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1552 } 1553 VOP_UNLOCK(vp); 1554 return (error); 1555 } 1556 1557 /* 1558 * Set ownership given a path name; this version follows links. 1559 */ 1560 /* ARGSUSED */ 1561 int 1562 sys_chown(p, v, retval) 1563 struct proc *p; 1564 void *v; 1565 register_t *retval; 1566 { 1567 register struct sys_chown_args /* { 1568 syscallarg(const char *) path; 1569 syscallarg(uid_t) uid; 1570 syscallarg(gid_t) gid; 1571 } */ *uap = v; 1572 int error; 1573 struct nameidata nd; 1574 1575 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1576 if ((error = namei(&nd)) != 0) 1577 return (error); 1578 1579 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p); 1580 1581 vrele(nd.ni_vp); 1582 return (error); 1583 } 1584 1585 /* 1586 * Set ownership given a file descriptor. 1587 */ 1588 /* ARGSUSED */ 1589 int 1590 sys_fchown(p, v, retval) 1591 struct proc *p; 1592 void *v; 1593 register_t *retval; 1594 { 1595 register struct sys_fchown_args /* { 1596 syscallarg(int) fd; 1597 syscallarg(uid_t) uid; 1598 syscallarg(gid_t) gid; 1599 } */ *uap = v; 1600 int error; 1601 struct file *fp; 1602 1603 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1604 return (error); 1605 1606 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1607 SCARG(uap, gid), p)); 1608 } 1609 1610 /* 1611 * Set ownership given a path name; this version does not follow links. 1612 */ 1613 /* ARGSUSED */ 1614 int 1615 sys_lchown(p, v, retval) 1616 struct proc *p; 1617 void *v; 1618 register_t *retval; 1619 { 1620 register struct sys_lchown_args /* { 1621 syscallarg(const char *) path; 1622 syscallarg(uid_t) uid; 1623 syscallarg(gid_t) gid; 1624 } */ *uap = v; 1625 int error; 1626 struct nameidata nd; 1627 1628 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1629 if ((error = namei(&nd)) != 0) 1630 return (error); 1631 1632 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p); 1633 1634 vrele(nd.ni_vp); 1635 return (error); 1636 } 1637 1638 /* 1639 * Common routine to set ownership given a vnode. 1640 */ 1641 static int 1642 change_owner(vp, uid, gid, p) 1643 register struct vnode *vp; 1644 uid_t uid; 1645 gid_t gid; 1646 struct proc *p; 1647 { 1648 struct vattr vattr; 1649 mode_t newmode = VNOVAL; 1650 int error; 1651 1652 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1653 VOP_LOCK(vp); 1654 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 1655 error = EROFS; 1656 goto out; 1657 } 1658 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 1659 goto out; 1660 1661 /* Clear (S_ISUID | S_ISGID) bits: alter va_mode only if necessary. */ 1662 if (vattr.va_mode & (S_ISUID | S_ISGID)) 1663 newmode = vattr.va_mode & ~(S_ISUID | S_ISGID); 1664 1665 VATTR_NULL(&vattr); 1666 vattr.va_uid = uid; 1667 vattr.va_gid = gid; 1668 vattr.va_mode = newmode; 1669 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1670 1671 out: 1672 VOP_UNLOCK(vp); 1673 return (error); 1674 } 1675 1676 /* 1677 * Set the access and modification times given a path name; this 1678 * version follows links. 1679 */ 1680 /* ARGSUSED */ 1681 int 1682 sys_utimes(p, v, retval) 1683 struct proc *p; 1684 void *v; 1685 register_t *retval; 1686 { 1687 register struct sys_utimes_args /* { 1688 syscallarg(const char *) path; 1689 syscallarg(const struct timeval *) tptr; 1690 } */ *uap = v; 1691 int error; 1692 struct nameidata nd; 1693 1694 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1695 if ((error = namei(&nd)) != 0) 1696 return (error); 1697 1698 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1699 1700 vrele(nd.ni_vp); 1701 return (error); 1702 } 1703 1704 /* 1705 * Set the access and modification times given a file descriptor. 1706 */ 1707 /* ARGSUSED */ 1708 int 1709 sys_futimes(p, v, retval) 1710 struct proc *p; 1711 void *v; 1712 register_t *retval; 1713 { 1714 register struct sys_futimes_args /* { 1715 syscallarg(int) fd; 1716 syscallarg(const struct timeval *) tptr; 1717 } */ *uap = v; 1718 int error; 1719 struct file *fp; 1720 1721 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1722 return (error); 1723 1724 return (change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), 1725 p)); 1726 } 1727 1728 /* 1729 * Set the access and modification times given a path name; this 1730 * version does not follow links. 1731 */ 1732 /* ARGSUSED */ 1733 int 1734 sys_lutimes(p, v, retval) 1735 struct proc *p; 1736 void *v; 1737 register_t *retval; 1738 { 1739 register struct sys_lutimes_args /* { 1740 syscallarg(const char *) path; 1741 syscallarg(const struct timeval *) tptr; 1742 } */ *uap = v; 1743 int error; 1744 struct nameidata nd; 1745 1746 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1747 if ((error = namei(&nd)) != 0) 1748 return (error); 1749 1750 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1751 1752 vrele(nd.ni_vp); 1753 return (error); 1754 } 1755 1756 /* 1757 * Common routine to set access and modification times given a vnode. 1758 */ 1759 static int 1760 change_utimes(vp, tptr, p) 1761 struct vnode *vp; 1762 const struct timeval *tptr; 1763 struct proc *p; 1764 { 1765 struct timeval tv[2]; 1766 struct vattr vattr; 1767 int error; 1768 1769 VATTR_NULL(&vattr); 1770 if (tptr == NULL) { 1771 microtime(&tv[0]); 1772 tv[1] = tv[0]; 1773 vattr.va_vaflags |= VA_UTIMES_NULL; 1774 } else { 1775 error = copyin(tptr, tv, sizeof (tv)); 1776 if (error) 1777 return (error); 1778 } 1779 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1780 VOP_LOCK(vp); 1781 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1782 error = EROFS; 1783 else { 1784 vattr.va_atime.tv_sec = tv[0].tv_sec; 1785 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1786 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1787 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1788 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1789 } 1790 VOP_UNLOCK(vp); 1791 return (error); 1792 } 1793 1794 /* 1795 * Truncate a file given its path name. 1796 */ 1797 /* ARGSUSED */ 1798 int 1799 sys_truncate(p, v, retval) 1800 struct proc *p; 1801 void *v; 1802 register_t *retval; 1803 { 1804 register struct sys_truncate_args /* { 1805 syscallarg(const char *) path; 1806 syscallarg(int) pad; 1807 syscallarg(off_t) length; 1808 } */ *uap = v; 1809 register struct vnode *vp; 1810 struct vattr vattr; 1811 int error; 1812 struct nameidata nd; 1813 1814 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1815 if ((error = namei(&nd)) != 0) 1816 return (error); 1817 vp = nd.ni_vp; 1818 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1819 VOP_LOCK(vp); 1820 if (vp->v_type == VDIR) 1821 error = EISDIR; 1822 else if ((error = vn_writechk(vp)) == 0 && 1823 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1824 VATTR_NULL(&vattr); 1825 vattr.va_size = SCARG(uap, length); 1826 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1827 } 1828 vput(vp); 1829 return (error); 1830 } 1831 1832 /* 1833 * Truncate a file given a file descriptor. 1834 */ 1835 /* ARGSUSED */ 1836 int 1837 sys_ftruncate(p, v, retval) 1838 struct proc *p; 1839 void *v; 1840 register_t *retval; 1841 { 1842 register struct sys_ftruncate_args /* { 1843 syscallarg(int) fd; 1844 syscallarg(int) pad; 1845 syscallarg(off_t) length; 1846 } */ *uap = v; 1847 struct vattr vattr; 1848 struct vnode *vp; 1849 struct file *fp; 1850 int error; 1851 1852 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1853 return (error); 1854 if ((fp->f_flag & FWRITE) == 0) 1855 return (EINVAL); 1856 vp = (struct vnode *)fp->f_data; 1857 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1858 VOP_LOCK(vp); 1859 if (vp->v_type == VDIR) 1860 error = EISDIR; 1861 else if ((error = vn_writechk(vp)) == 0) { 1862 VATTR_NULL(&vattr); 1863 vattr.va_size = SCARG(uap, length); 1864 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1865 } 1866 VOP_UNLOCK(vp); 1867 return (error); 1868 } 1869 1870 /* 1871 * Sync an open file. 1872 */ 1873 /* ARGSUSED */ 1874 int 1875 sys_fsync(p, v, retval) 1876 struct proc *p; 1877 void *v; 1878 register_t *retval; 1879 { 1880 struct sys_fsync_args /* { 1881 syscallarg(int) fd; 1882 } */ *uap = v; 1883 register struct vnode *vp; 1884 struct file *fp; 1885 int error; 1886 1887 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1888 return (error); 1889 vp = (struct vnode *)fp->f_data; 1890 VOP_LOCK(vp); 1891 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p); 1892 VOP_UNLOCK(vp); 1893 return (error); 1894 } 1895 1896 /* 1897 * Rename files, (standard) BSD semantics frontend. 1898 */ 1899 /* ARGSUSED */ 1900 int 1901 sys_rename(p, v, retval) 1902 struct proc *p; 1903 void *v; 1904 register_t *retval; 1905 { 1906 register struct sys_rename_args /* { 1907 syscallarg(const char *) from; 1908 syscallarg(const char *) to; 1909 } */ *uap = v; 1910 1911 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 1912 } 1913 1914 /* 1915 * Rename files, POSIX semantics frontend. 1916 */ 1917 /* ARGSUSED */ 1918 int 1919 sys_posix_rename(p, v, retval) 1920 struct proc *p; 1921 void *v; 1922 register_t *retval; 1923 { 1924 register struct sys_posix_rename_args /* { 1925 syscallarg(const char *) from; 1926 syscallarg(const char *) to; 1927 } */ *uap = v; 1928 1929 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 1930 } 1931 1932 /* 1933 * Rename files. Source and destination must either both be directories, 1934 * or both not be directories. If target is a directory, it must be empty. 1935 * If `from' and `to' refer to the same object, the value of the `retain' 1936 * argument is used to determine whether `from' will be 1937 * 1938 * (retain == 0) deleted unless `from' and `to' refer to the same 1939 * object in the file system's name space (BSD). 1940 * (retain == 1) always retained (POSIX). 1941 */ 1942 static int 1943 rename_files(from, to, p, retain) 1944 const char *from, *to; 1945 struct proc *p; 1946 int retain; 1947 { 1948 register struct vnode *tvp, *fvp, *tdvp; 1949 struct nameidata fromnd, tond; 1950 int error; 1951 1952 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 1953 from, p); 1954 if ((error = namei(&fromnd)) != 0) 1955 return (error); 1956 fvp = fromnd.ni_vp; 1957 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 1958 UIO_USERSPACE, to, p); 1959 if ((error = namei(&tond)) != 0) { 1960 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1961 vrele(fromnd.ni_dvp); 1962 vrele(fvp); 1963 goto out1; 1964 } 1965 tdvp = tond.ni_dvp; 1966 tvp = tond.ni_vp; 1967 1968 if (tvp != NULL) { 1969 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 1970 error = ENOTDIR; 1971 goto out; 1972 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 1973 error = EISDIR; 1974 goto out; 1975 } 1976 } 1977 1978 if (fvp == tdvp) 1979 error = EINVAL; 1980 1981 /* 1982 * Source and destination refer to the same object. 1983 */ 1984 if (fvp == tvp) { 1985 if (retain) 1986 error = -1; 1987 else if (fromnd.ni_dvp == tdvp && 1988 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 1989 !bcmp(fromnd.ni_cnd.cn_nameptr, 1990 tond.ni_cnd.cn_nameptr, 1991 fromnd.ni_cnd.cn_namelen)) 1992 error = -1; 1993 } 1994 1995 out: 1996 if (!error) { 1997 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 1998 if (fromnd.ni_dvp != tdvp) 1999 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2000 if (tvp) { 2001 (void)vnode_pager_uncache(tvp); 2002 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2003 } 2004 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2005 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2006 } else { 2007 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2008 if (tdvp == tvp) 2009 vrele(tdvp); 2010 else 2011 vput(tdvp); 2012 if (tvp) 2013 vput(tvp); 2014 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2015 vrele(fromnd.ni_dvp); 2016 vrele(fvp); 2017 } 2018 vrele(tond.ni_startdir); 2019 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2020 out1: 2021 if (fromnd.ni_startdir) 2022 vrele(fromnd.ni_startdir); 2023 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2024 return (error == -1 ? 0 : error); 2025 } 2026 2027 /* 2028 * Make a directory file. 2029 */ 2030 /* ARGSUSED */ 2031 int 2032 sys_mkdir(p, v, retval) 2033 struct proc *p; 2034 void *v; 2035 register_t *retval; 2036 { 2037 register struct sys_mkdir_args /* { 2038 syscallarg(const char *) path; 2039 syscallarg(int) mode; 2040 } */ *uap = v; 2041 register struct vnode *vp; 2042 struct vattr vattr; 2043 int error; 2044 struct nameidata nd; 2045 2046 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2047 if ((error = namei(&nd)) != 0) 2048 return (error); 2049 vp = nd.ni_vp; 2050 if (vp != NULL) { 2051 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2052 if (nd.ni_dvp == vp) 2053 vrele(nd.ni_dvp); 2054 else 2055 vput(nd.ni_dvp); 2056 vrele(vp); 2057 return (EEXIST); 2058 } 2059 VATTR_NULL(&vattr); 2060 vattr.va_type = VDIR; 2061 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 2062 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2063 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2064 if (!error) 2065 vput(nd.ni_vp); 2066 return (error); 2067 } 2068 2069 /* 2070 * Remove a directory file. 2071 */ 2072 /* ARGSUSED */ 2073 int 2074 sys_rmdir(p, v, retval) 2075 struct proc *p; 2076 void *v; 2077 register_t *retval; 2078 { 2079 struct sys_rmdir_args /* { 2080 syscallarg(const char *) path; 2081 } */ *uap = v; 2082 register struct vnode *vp; 2083 int error; 2084 struct nameidata nd; 2085 2086 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2087 SCARG(uap, path), p); 2088 if ((error = namei(&nd)) != 0) 2089 return (error); 2090 vp = nd.ni_vp; 2091 if (vp->v_type != VDIR) { 2092 error = ENOTDIR; 2093 goto out; 2094 } 2095 /* 2096 * No rmdir "." please. 2097 */ 2098 if (nd.ni_dvp == vp) { 2099 error = EINVAL; 2100 goto out; 2101 } 2102 /* 2103 * The root of a mounted filesystem cannot be deleted. 2104 */ 2105 if (vp->v_flag & VROOT) 2106 error = EBUSY; 2107 out: 2108 if (!error) { 2109 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2110 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2111 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2112 } else { 2113 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2114 if (nd.ni_dvp == vp) 2115 vrele(nd.ni_dvp); 2116 else 2117 vput(nd.ni_dvp); 2118 vput(vp); 2119 } 2120 return (error); 2121 } 2122 2123 /* 2124 * Read a block of directory entries in a file system independent format. 2125 */ 2126 int 2127 sys_getdents(p, v, retval) 2128 struct proc *p; 2129 void *v; 2130 register_t *retval; 2131 { 2132 register struct sys_getdents_args /* { 2133 syscallarg(int) fd; 2134 syscallarg(char *) buf; 2135 syscallarg(size_t) count; 2136 } */ *uap = v; 2137 struct file *fp; 2138 int error, done; 2139 2140 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2141 return (error); 2142 if ((fp->f_flag & FREAD) == 0) 2143 return (EBADF); 2144 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2145 SCARG(uap, count), &done, p, 0, 0); 2146 *retval = done; 2147 return (error); 2148 } 2149 2150 /* 2151 * Set the mode mask for creation of filesystem nodes. 2152 */ 2153 int 2154 sys_umask(p, v, retval) 2155 struct proc *p; 2156 void *v; 2157 register_t *retval; 2158 { 2159 struct sys_umask_args /* { 2160 syscallarg(mode_t) newmask; 2161 } */ *uap = v; 2162 register struct filedesc *fdp; 2163 2164 fdp = p->p_fd; 2165 *retval = fdp->fd_cmask; 2166 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2167 return (0); 2168 } 2169 2170 /* 2171 * Void all references to file by ripping underlying filesystem 2172 * away from vnode. 2173 */ 2174 /* ARGSUSED */ 2175 int 2176 sys_revoke(p, v, retval) 2177 struct proc *p; 2178 void *v; 2179 register_t *retval; 2180 { 2181 register struct sys_revoke_args /* { 2182 syscallarg(const char *) path; 2183 } */ *uap = v; 2184 register struct vnode *vp; 2185 struct vattr vattr; 2186 int error; 2187 struct nameidata nd; 2188 2189 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2190 if ((error = namei(&nd)) != 0) 2191 return (error); 2192 vp = nd.ni_vp; 2193 if (vp->v_type != VCHR && vp->v_type != VBLK) { 2194 error = EINVAL; 2195 goto out; 2196 } 2197 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2198 goto out; 2199 if (p->p_ucred->cr_uid != vattr.va_uid && 2200 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2201 goto out; 2202 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2203 vgoneall(vp); 2204 out: 2205 vrele(vp); 2206 return (error); 2207 } 2208 2209 /* 2210 * Convert a user file descriptor to a kernel file entry. 2211 */ 2212 int 2213 getvnode(fdp, fd, fpp) 2214 struct filedesc *fdp; 2215 int fd; 2216 struct file **fpp; 2217 { 2218 struct vnode *vp; 2219 struct file *fp; 2220 2221 if ((u_int)fd >= fdp->fd_nfiles || 2222 (fp = fdp->fd_ofiles[fd]) == NULL) 2223 return (EBADF); 2224 if (fp->f_type != DTYPE_VNODE) 2225 return (EINVAL); 2226 vp = (struct vnode *)fp->f_data; 2227 if (vp->v_type == VBAD) 2228 return (EBADF); 2229 *fpp = fp; 2230 return (0); 2231 } 2232
Indexes created Wed Sep 24 22:09:59 GMT 2025