vfs_syscalls.c revision 1.110
1 /* $NetBSD: vfs_syscalls.c,v 1.110 1998/02/05 08:00:05 mrg 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 #if defined(UVM) 63 #include <uvm/uvm_extern.h> 64 #endif 65 66 static int change_dir __P((struct nameidata *, struct proc *)); 67 static int change_mode __P((struct vnode *, int, struct proc *p)); 68 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *)); 69 static int change_utimes __P((struct vnode *vp, const struct timeval *, 70 struct proc *p)); 71 static int rename_files __P((const char *, const char *, struct proc *, int)); 72 73 void checkdirs __P((struct vnode *)); 74 int dounmount __P((struct mount *, int, struct proc *)); 75 76 /* 77 * Virtual File System System Calls 78 */ 79 80 /* 81 * Mount a file system. 82 */ 83 84 #if defined(COMPAT_09) || defined(COMPAT_43) 85 /* 86 * This table is used to maintain compatibility with 4.3BSD 87 * and NetBSD 0.9 mount syscalls. Note, the order is important! 88 */ 89 static const char *mountcompatnames[] = { 90 NULL, /* 0 = MOUNT_NONE */ 91 MOUNT_FFS, /* 1 */ 92 MOUNT_NFS, /* 2 */ 93 MOUNT_MFS, /* 3 */ 94 MOUNT_MSDOS, /* 4 */ 95 MOUNT_LFS, /* 5 */ 96 NULL, /* 6 = MOUNT_LOFS */ 97 MOUNT_FDESC, /* 7 */ 98 MOUNT_PORTAL, /* 8 */ 99 MOUNT_NULL, /* 9 */ 100 MOUNT_UMAP, /* 10 */ 101 MOUNT_KERNFS, /* 11 */ 102 MOUNT_PROCFS, /* 12 */ 103 MOUNT_AFS, /* 13 */ 104 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 105 MOUNT_UNION, /* 15 */ 106 MOUNT_ADOSFS, /* 16 */ 107 MOUNT_EXT2FS, /* 17 */ 108 }; 109 static const int nmountcompatnames = sizeof(mountcompatnames) / 110 sizeof(mountcompatnames[0]); 111 #endif /* COMPAT_09 || COMPAT_43 */ 112 113 /* ARGSUSED */ 114 int 115 sys_mount(p, v, retval) 116 struct proc *p; 117 void *v; 118 register_t *retval; 119 { 120 register struct sys_mount_args /* { 121 syscallarg(const char *) type; 122 syscallarg(const char *) path; 123 syscallarg(int) flags; 124 syscallarg(void *) data; 125 } */ *uap = v; 126 register struct vnode *vp; 127 register struct mount *mp; 128 int error, flag = 0; 129 char fstypename[MFSNAMELEN]; 130 struct vattr va; 131 struct nameidata nd; 132 struct vfsops *vfs; 133 134 /* 135 * Get vnode to be covered 136 */ 137 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 138 SCARG(uap, path), p); 139 if ((error = namei(&nd)) != 0) 140 return (error); 141 vp = nd.ni_vp; 142 if (SCARG(uap, flags) & MNT_UPDATE) { 143 if ((vp->v_flag & VROOT) == 0) { 144 vput(vp); 145 return (EINVAL); 146 } 147 mp = vp->v_mount; 148 flag = mp->mnt_flag; 149 vfs = mp->mnt_op; 150 /* 151 * We only allow the filesystem to be reloaded if it 152 * is currently mounted read-only. 153 */ 154 if ((SCARG(uap, flags) & MNT_RELOAD) && 155 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 156 vput(vp); 157 return (EOPNOTSUPP); /* Needs translation */ 158 } 159 mp->mnt_flag |= 160 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 161 /* 162 * Only root, or the user that did the original mount is 163 * permitted to update it. 164 */ 165 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 166 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 167 vput(vp); 168 return (error); 169 } 170 /* 171 * Do not allow NFS export by non-root users. Silently 172 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 173 */ 174 if (p->p_ucred->cr_uid != 0) { 175 if (SCARG(uap, flags) & MNT_EXPORTED) { 176 vput(vp); 177 return (EPERM); 178 } 179 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 180 } 181 VOP_UNLOCK(vp); 182 goto update; 183 } 184 /* 185 * If the user is not root, ensure that they own the directory 186 * onto which we are attempting to mount. 187 */ 188 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 189 (va.va_uid != p->p_ucred->cr_uid && 190 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 191 vput(vp); 192 return (error); 193 } 194 /* 195 * Do not allow NFS export by non-root users. Silently 196 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 197 */ 198 if (p->p_ucred->cr_uid != 0) { 199 if (SCARG(uap, flags) & MNT_EXPORTED) { 200 vput(vp); 201 return (EPERM); 202 } 203 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 204 } 205 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 206 return (error); 207 if (vp->v_type != VDIR) { 208 vput(vp); 209 return (ENOTDIR); 210 } 211 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 212 if (error) { 213 #if defined(COMPAT_09) || defined(COMPAT_43) 214 /* 215 * Historically filesystem types were identified by number. 216 * If we get an integer for the filesystem type instead of a 217 * string, we check to see if it matches one of the historic 218 * filesystem types. 219 */ 220 u_long fsindex = (u_long)SCARG(uap, type); 221 if (fsindex >= nmountcompatnames || 222 mountcompatnames[fsindex] == NULL) { 223 vput(vp); 224 return (ENODEV); 225 } 226 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 227 #else 228 vput(vp); 229 return (error); 230 #endif 231 } 232 #ifdef COMPAT_10 233 /* Accept `ufs' as an alias for `ffs'. */ 234 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 235 strncpy(fstypename, "ffs", MFSNAMELEN); 236 #endif 237 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 238 vput(vp); 239 return (ENODEV); 240 } 241 if (vp->v_mountedhere != NULL) { 242 vput(vp); 243 return (EBUSY); 244 } 245 246 /* 247 * Allocate and initialize the file system. 248 */ 249 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 250 M_MOUNT, M_WAITOK); 251 bzero((char *)mp, (u_long)sizeof(struct mount)); 252 mp->mnt_op = vfs; 253 if ((error = vfs_lock(mp)) != 0) { 254 free((caddr_t)mp, M_MOUNT); 255 vput(vp); 256 return (error); 257 } 258 /* Do this early in case we block later. */ 259 vfs->vfs_refcount++; 260 vp->v_mountedhere = mp; 261 mp->mnt_vnodecovered = vp; 262 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 263 update: 264 /* 265 * Set the mount level flags. 266 */ 267 if (SCARG(uap, flags) & MNT_RDONLY) 268 mp->mnt_flag |= MNT_RDONLY; 269 else if (mp->mnt_flag & MNT_RDONLY) 270 mp->mnt_flag |= MNT_WANTRDWR; 271 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 272 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 273 MNT_NOATIME | MNT_SYMPERM); 274 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 275 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 276 MNT_NOCOREDUMP | MNT_NOATIME | MNT_SYMPERM); 277 /* 278 * Mount the filesystem. 279 */ 280 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 281 if (mp->mnt_flag & MNT_UPDATE) { 282 vrele(vp); 283 if (mp->mnt_flag & MNT_WANTRDWR) 284 mp->mnt_flag &= ~MNT_RDONLY; 285 mp->mnt_flag &=~ 286 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 287 if (error) 288 mp->mnt_flag = flag; 289 return (error); 290 } 291 /* 292 * Put the new filesystem on the mount list after root. 293 */ 294 cache_purge(vp); 295 if (!error) { 296 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 297 checkdirs(vp); 298 VOP_UNLOCK(vp); 299 vfs_unlock(mp); 300 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 301 error = VFS_START(mp, 0, p); 302 } else { 303 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 304 vfs->vfs_refcount--; 305 vfs_unlock(mp); 306 free((caddr_t)mp, M_MOUNT); 307 vput(vp); 308 } 309 return (error); 310 } 311 312 /* 313 * Scan all active processes to see if any of them have a current 314 * or root directory onto which the new filesystem has just been 315 * mounted. If so, replace them with the new mount point. 316 */ 317 void 318 checkdirs(olddp) 319 struct vnode *olddp; 320 { 321 struct filedesc *fdp; 322 struct vnode *newdp; 323 struct proc *p; 324 325 if (olddp->v_usecount == 1) 326 return; 327 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 328 panic("mount: lost mount"); 329 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 330 fdp = p->p_fd; 331 if (fdp->fd_cdir == olddp) { 332 vrele(fdp->fd_cdir); 333 VREF(newdp); 334 fdp->fd_cdir = newdp; 335 } 336 if (fdp->fd_rdir == olddp) { 337 vrele(fdp->fd_rdir); 338 VREF(newdp); 339 fdp->fd_rdir = newdp; 340 } 341 } 342 if (rootvnode == olddp) { 343 vrele(rootvnode); 344 VREF(newdp); 345 rootvnode = newdp; 346 } 347 vput(newdp); 348 } 349 350 /* 351 * Unmount a file system. 352 * 353 * Note: unmount takes a path to the vnode mounted on as argument, 354 * not special file (as before). 355 */ 356 /* ARGSUSED */ 357 int 358 sys_unmount(p, v, retval) 359 struct proc *p; 360 void *v; 361 register_t *retval; 362 { 363 register struct sys_unmount_args /* { 364 syscallarg(const char *) path; 365 syscallarg(int) flags; 366 } */ *uap = v; 367 register struct vnode *vp; 368 struct mount *mp; 369 int error; 370 struct nameidata nd; 371 372 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 373 SCARG(uap, path), p); 374 if ((error = namei(&nd)) != 0) 375 return (error); 376 vp = nd.ni_vp; 377 mp = vp->v_mount; 378 379 /* 380 * Only root, or the user that did the original mount is 381 * permitted to unmount this filesystem. 382 */ 383 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 384 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 385 vput(vp); 386 return (error); 387 } 388 389 /* 390 * Don't allow unmounting the root file system. 391 */ 392 if (mp->mnt_flag & MNT_ROOTFS) { 393 vput(vp); 394 return (EINVAL); 395 } 396 397 /* 398 * Must be the root of the filesystem 399 */ 400 if ((vp->v_flag & VROOT) == 0) { 401 vput(vp); 402 return (EINVAL); 403 } 404 vput(vp); 405 406 if (vfs_busy(mp)) 407 return (EBUSY); 408 409 return (dounmount(mp, SCARG(uap, flags), p)); 410 } 411 412 /* 413 * Do the actual file system unmount. File system is assumed to have been 414 * marked busy by the caller. 415 */ 416 int 417 dounmount(mp, flags, p) 418 register struct mount *mp; 419 int flags; 420 struct proc *p; 421 { 422 struct vnode *coveredvp; 423 int error; 424 425 coveredvp = mp->mnt_vnodecovered; 426 mp->mnt_flag |= MNT_UNMOUNT; 427 if ((error = vfs_lock(mp)) != 0) { 428 vfs_unbusy(mp); 429 return (error); 430 } 431 432 if (mp->mnt_flag & MNT_EXPUBLIC) 433 vfs_setpublicfs(NULL, NULL, NULL); 434 435 mp->mnt_flag &=~ MNT_ASYNC; 436 #if !defined(UVM) 437 vnode_pager_umount(mp); /* release cached vnodes */ 438 #endif 439 cache_purgevfs(mp); /* remove cache entries for this file sys */ 440 if ((error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0 || 441 (flags & MNT_FORCE)) 442 error = VFS_UNMOUNT(mp, flags, p); 443 mp->mnt_flag &= ~MNT_UNMOUNT; 444 vfs_unbusy(mp); 445 if (error) { 446 vfs_unlock(mp); 447 } else { 448 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 449 if (coveredvp != NULLVP) { 450 vrele(coveredvp); 451 coveredvp->v_mountedhere = (struct mount *)0; 452 } 453 mp->mnt_op->vfs_refcount--; 454 vfs_unlock(mp); 455 if (mp->mnt_vnodelist.lh_first != NULL) 456 panic("unmount: dangling vnode"); 457 free((caddr_t)mp, M_MOUNT); 458 } 459 return (error); 460 } 461 462 /* 463 * Sync each mounted filesystem. 464 */ 465 #ifdef DEBUG 466 int syncprt = 0; 467 struct ctldebug debug0 = { "syncprt", &syncprt }; 468 #endif 469 470 /* ARGSUSED */ 471 int 472 sys_sync(p, v, retval) 473 struct proc *p; 474 void *v; 475 register_t *retval; 476 { 477 register struct mount *mp, *nmp; 478 int asyncflag; 479 480 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 481 /* 482 * Get the prev pointer in case we hang on vfs_busy 483 * while we are being unmounted. 484 */ 485 nmp = mp->mnt_list.cqe_prev; 486 /* 487 * The lock check below is to avoid races with mount 488 * and unmount. 489 */ 490 if ((mp->mnt_flag & (MNT_MLOCK|MNT_RDONLY|MNT_MPBUSY)) == 0 && 491 !vfs_busy(mp)) { 492 asyncflag = mp->mnt_flag & MNT_ASYNC; 493 mp->mnt_flag &= ~MNT_ASYNC; 494 #if defined(UVM) 495 uvm_vnp_sync(mp); 496 #else 497 vnode_pager_sync(mp); 498 #endif 499 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 500 if (asyncflag) 501 mp->mnt_flag |= MNT_ASYNC; 502 /* 503 * Get the prev pointer again, as the prior filesystem 504 * might have been unmounted while we were sync'ing. 505 */ 506 nmp = mp->mnt_list.cqe_prev; 507 vfs_unbusy(mp); 508 } 509 } 510 #ifdef DEBUG 511 if (syncprt) 512 vfs_bufstats(); 513 #endif /* DEBUG */ 514 return (0); 515 } 516 517 /* 518 * Change filesystem quotas. 519 */ 520 /* ARGSUSED */ 521 int 522 sys_quotactl(p, v, retval) 523 struct proc *p; 524 void *v; 525 register_t *retval; 526 { 527 register struct sys_quotactl_args /* { 528 syscallarg(const char *) path; 529 syscallarg(int) cmd; 530 syscallarg(int) uid; 531 syscallarg(caddr_t) arg; 532 } */ *uap = v; 533 register struct mount *mp; 534 int error; 535 struct nameidata nd; 536 537 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 538 if ((error = namei(&nd)) != 0) 539 return (error); 540 mp = nd.ni_vp->v_mount; 541 vrele(nd.ni_vp); 542 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 543 SCARG(uap, arg), p)); 544 } 545 546 /* 547 * Get filesystem statistics. 548 */ 549 /* ARGSUSED */ 550 int 551 sys_statfs(p, v, retval) 552 struct proc *p; 553 void *v; 554 register_t *retval; 555 { 556 register struct sys_statfs_args /* { 557 syscallarg(const char *) path; 558 syscallarg(struct statfs *) buf; 559 } */ *uap = v; 560 register struct mount *mp; 561 register struct statfs *sp; 562 int error; 563 struct nameidata nd; 564 565 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 566 if ((error = namei(&nd)) != 0) 567 return (error); 568 mp = nd.ni_vp->v_mount; 569 sp = &mp->mnt_stat; 570 vrele(nd.ni_vp); 571 if ((error = VFS_STATFS(mp, sp, p)) != 0) 572 return (error); 573 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 574 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 575 } 576 577 /* 578 * Get filesystem statistics. 579 */ 580 /* ARGSUSED */ 581 int 582 sys_fstatfs(p, v, retval) 583 struct proc *p; 584 void *v; 585 register_t *retval; 586 { 587 register struct sys_fstatfs_args /* { 588 syscallarg(int) fd; 589 syscallarg(struct statfs *) buf; 590 } */ *uap = v; 591 struct file *fp; 592 struct mount *mp; 593 register struct statfs *sp; 594 int error; 595 596 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 597 return (error); 598 mp = ((struct vnode *)fp->f_data)->v_mount; 599 sp = &mp->mnt_stat; 600 if ((error = VFS_STATFS(mp, sp, p)) != 0) 601 return (error); 602 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 603 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 604 } 605 606 /* 607 * Get statistics on all filesystems. 608 */ 609 int 610 sys_getfsstat(p, v, retval) 611 struct proc *p; 612 void *v; 613 register_t *retval; 614 { 615 register struct sys_getfsstat_args /* { 616 syscallarg(struct statfs *) buf; 617 syscallarg(long) bufsize; 618 syscallarg(int) flags; 619 } */ *uap = v; 620 register struct mount *mp, *nmp; 621 register struct statfs *sp; 622 caddr_t sfsp; 623 long count, maxcount, error; 624 625 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 626 sfsp = (caddr_t)SCARG(uap, buf); 627 for (count = 0, 628 mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 629 nmp = mp->mnt_list.cqe_next; 630 if (sfsp && count < maxcount && 631 ((mp->mnt_flag & MNT_MLOCK) == 0)) { 632 sp = &mp->mnt_stat; 633 /* 634 * If MNT_NOWAIT is specified, do not refresh the 635 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 636 */ 637 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 638 (SCARG(uap, flags) & MNT_WAIT)) && 639 (error = VFS_STATFS(mp, sp, p)) != 0) 640 continue; 641 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 642 error = copyout(sp, sfsp, sizeof(*sp)); 643 if (error) 644 return (error); 645 sfsp += sizeof(*sp); 646 } 647 count++; 648 } 649 if (sfsp && count > maxcount) 650 *retval = maxcount; 651 else 652 *retval = count; 653 return (0); 654 } 655 656 /* 657 * Change current working directory to a given file descriptor. 658 */ 659 /* ARGSUSED */ 660 int 661 sys_fchdir(p, v, retval) 662 struct proc *p; 663 void *v; 664 register_t *retval; 665 { 666 struct sys_fchdir_args /* { 667 syscallarg(int) fd; 668 } */ *uap = v; 669 register struct filedesc *fdp = p->p_fd; 670 struct vnode *vp, *tdp; 671 struct mount *mp; 672 struct file *fp; 673 int error; 674 675 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 676 return (error); 677 vp = (struct vnode *)fp->f_data; 678 VREF(vp); 679 VOP_LOCK(vp); 680 if (vp->v_type != VDIR) 681 error = ENOTDIR; 682 else 683 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 684 while (!error && (mp = vp->v_mountedhere) != NULL) { 685 if (mp->mnt_flag & MNT_MLOCK) { 686 mp->mnt_flag |= MNT_MWAIT; 687 sleep((caddr_t)mp, PVFS); 688 continue; 689 } 690 if ((error = VFS_ROOT(mp, &tdp)) != 0) 691 break; 692 vput(vp); 693 vp = tdp; 694 } 695 VOP_UNLOCK(vp); 696 if (error) { 697 vrele(vp); 698 return (error); 699 } 700 vrele(fdp->fd_cdir); 701 fdp->fd_cdir = vp; 702 return (0); 703 } 704 705 /* 706 * Change current working directory (``.''). 707 */ 708 /* ARGSUSED */ 709 int 710 sys_chdir(p, v, retval) 711 struct proc *p; 712 void *v; 713 register_t *retval; 714 { 715 struct sys_chdir_args /* { 716 syscallarg(const char *) path; 717 } */ *uap = v; 718 register struct filedesc *fdp = p->p_fd; 719 int error; 720 struct nameidata nd; 721 722 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 723 SCARG(uap, path), p); 724 if ((error = change_dir(&nd, p)) != 0) 725 return (error); 726 vrele(fdp->fd_cdir); 727 fdp->fd_cdir = nd.ni_vp; 728 return (0); 729 } 730 731 /* 732 * Change notion of root (``/'') directory. 733 */ 734 /* ARGSUSED */ 735 int 736 sys_chroot(p, v, retval) 737 struct proc *p; 738 void *v; 739 register_t *retval; 740 { 741 struct sys_chroot_args /* { 742 syscallarg(const char *) path; 743 } */ *uap = v; 744 register struct filedesc *fdp = p->p_fd; 745 int error; 746 struct nameidata nd; 747 748 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 749 return (error); 750 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 751 SCARG(uap, path), p); 752 if ((error = change_dir(&nd, p)) != 0) 753 return (error); 754 if (fdp->fd_rdir != NULL) 755 vrele(fdp->fd_rdir); 756 fdp->fd_rdir = nd.ni_vp; 757 return (0); 758 } 759 760 /* 761 * Common routine for chroot and chdir. 762 */ 763 static int 764 change_dir(ndp, p) 765 register struct nameidata *ndp; 766 struct proc *p; 767 { 768 struct vnode *vp; 769 int error; 770 771 if ((error = namei(ndp)) != 0) 772 return (error); 773 vp = ndp->ni_vp; 774 if (vp->v_type != VDIR) 775 error = ENOTDIR; 776 else 777 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 778 VOP_UNLOCK(vp); 779 if (error) 780 vrele(vp); 781 return (error); 782 } 783 784 /* 785 * Check permissions, allocate an open file structure, 786 * and call the device open routine if any. 787 */ 788 int 789 sys_open(p, v, retval) 790 struct proc *p; 791 void *v; 792 register_t *retval; 793 { 794 register struct sys_open_args /* { 795 syscallarg(const char *) path; 796 syscallarg(int) flags; 797 syscallarg(int) mode; 798 } */ *uap = v; 799 register struct filedesc *fdp = p->p_fd; 800 register struct file *fp; 801 register struct vnode *vp; 802 int flags, cmode; 803 struct file *nfp; 804 int type, indx, error; 805 struct flock lf; 806 struct nameidata nd; 807 extern struct fileops vnops; 808 809 flags = FFLAGS(SCARG(uap, flags)); 810 if ((flags & (FREAD | FWRITE)) == 0) 811 return (EINVAL); 812 if ((error = falloc(p, &nfp, &indx)) != 0) 813 return (error); 814 fp = nfp; 815 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 816 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 817 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 818 if ((error = vn_open(&nd, flags, cmode)) != 0) { 819 ffree(fp); 820 if ((error == ENODEV || error == ENXIO) && 821 p->p_dupfd >= 0 && /* XXX from fdopen */ 822 (error = 823 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 824 *retval = indx; 825 return (0); 826 } 827 if (error == ERESTART) 828 error = EINTR; 829 fdp->fd_ofiles[indx] = NULL; 830 return (error); 831 } 832 p->p_dupfd = 0; 833 vp = nd.ni_vp; 834 fp->f_flag = flags & FMASK; 835 fp->f_type = DTYPE_VNODE; 836 fp->f_ops = &vnops; 837 fp->f_data = (caddr_t)vp; 838 if (flags & (O_EXLOCK | O_SHLOCK)) { 839 lf.l_whence = SEEK_SET; 840 lf.l_start = 0; 841 lf.l_len = 0; 842 if (flags & O_EXLOCK) 843 lf.l_type = F_WRLCK; 844 else 845 lf.l_type = F_RDLCK; 846 type = F_FLOCK; 847 if ((flags & FNONBLOCK) == 0) 848 type |= F_WAIT; 849 VOP_UNLOCK(vp); 850 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 851 if (error) { 852 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 853 ffree(fp); 854 fdp->fd_ofiles[indx] = NULL; 855 return (error); 856 } 857 VOP_LOCK(vp); 858 fp->f_flag |= FHASLOCK; 859 } 860 VOP_UNLOCK(vp); 861 *retval = indx; 862 return (0); 863 } 864 865 /* 866 * Create a special file. 867 */ 868 /* ARGSUSED */ 869 int 870 sys_mknod(p, v, retval) 871 struct proc *p; 872 void *v; 873 register_t *retval; 874 { 875 register struct sys_mknod_args /* { 876 syscallarg(const char *) path; 877 syscallarg(int) mode; 878 syscallarg(int) dev; 879 } */ *uap = v; 880 register struct vnode *vp; 881 struct vattr vattr; 882 int error; 883 int whiteout = 0; 884 struct nameidata nd; 885 886 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 887 return (error); 888 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 889 if ((error = namei(&nd)) != 0) 890 return (error); 891 vp = nd.ni_vp; 892 if (vp != NULL) 893 error = EEXIST; 894 else { 895 VATTR_NULL(&vattr); 896 vattr.va_mode = 897 (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 898 vattr.va_rdev = SCARG(uap, dev); 899 whiteout = 0; 900 901 switch (SCARG(uap, mode) & S_IFMT) { 902 case S_IFMT: /* used by badsect to flag bad sectors */ 903 vattr.va_type = VBAD; 904 break; 905 case S_IFCHR: 906 vattr.va_type = VCHR; 907 break; 908 case S_IFBLK: 909 vattr.va_type = VBLK; 910 break; 911 case S_IFWHT: 912 whiteout = 1; 913 break; 914 default: 915 error = EINVAL; 916 break; 917 } 918 } 919 if (!error) { 920 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 921 if (whiteout) { 922 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 923 if (error) 924 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 925 vput(nd.ni_dvp); 926 } else { 927 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 928 &nd.ni_cnd, &vattr); 929 } 930 } else { 931 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 932 if (nd.ni_dvp == vp) 933 vrele(nd.ni_dvp); 934 else 935 vput(nd.ni_dvp); 936 if (vp) 937 vrele(vp); 938 } 939 return (error); 940 } 941 942 /* 943 * Create a named pipe. 944 */ 945 /* ARGSUSED */ 946 int 947 sys_mkfifo(p, v, retval) 948 struct proc *p; 949 void *v; 950 register_t *retval; 951 { 952 #ifndef FIFO 953 return (EOPNOTSUPP); 954 #else 955 register struct sys_mkfifo_args /* { 956 syscallarg(const char *) path; 957 syscallarg(int) mode; 958 } */ *uap = v; 959 struct vattr vattr; 960 int error; 961 struct nameidata nd; 962 963 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 964 if ((error = namei(&nd)) != 0) 965 return (error); 966 if (nd.ni_vp != NULL) { 967 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 968 if (nd.ni_dvp == nd.ni_vp) 969 vrele(nd.ni_dvp); 970 else 971 vput(nd.ni_dvp); 972 vrele(nd.ni_vp); 973 return (EEXIST); 974 } 975 VATTR_NULL(&vattr); 976 vattr.va_type = VFIFO; 977 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 978 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 979 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 980 #endif /* FIFO */ 981 } 982 983 /* 984 * Make a hard file link. 985 */ 986 /* ARGSUSED */ 987 int 988 sys_link(p, v, retval) 989 struct proc *p; 990 void *v; 991 register_t *retval; 992 { 993 register struct sys_link_args /* { 994 syscallarg(const char *) path; 995 syscallarg(const char *) link; 996 } */ *uap = v; 997 register struct vnode *vp; 998 struct nameidata nd; 999 int error; 1000 1001 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1002 if ((error = namei(&nd)) != 0) 1003 return (error); 1004 vp = nd.ni_vp; 1005 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1006 if ((error = namei(&nd)) != 0) 1007 goto out; 1008 if (nd.ni_vp) { 1009 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1010 if (nd.ni_dvp == nd.ni_vp) 1011 vrele(nd.ni_dvp); 1012 else 1013 vput(nd.ni_dvp); 1014 vrele(nd.ni_vp); 1015 error = EEXIST; 1016 goto out; 1017 } 1018 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1019 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1020 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1021 out: 1022 vrele(vp); 1023 return (error); 1024 } 1025 1026 /* 1027 * Make a symbolic link. 1028 */ 1029 /* ARGSUSED */ 1030 int 1031 sys_symlink(p, v, retval) 1032 struct proc *p; 1033 void *v; 1034 register_t *retval; 1035 { 1036 register struct sys_symlink_args /* { 1037 syscallarg(const char *) path; 1038 syscallarg(const char *) link; 1039 } */ *uap = v; 1040 struct vattr vattr; 1041 char *path; 1042 int error; 1043 struct nameidata nd; 1044 1045 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1046 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1047 if (error) 1048 goto out; 1049 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1050 if ((error = namei(&nd)) != 0) 1051 goto out; 1052 if (nd.ni_vp) { 1053 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1054 if (nd.ni_dvp == nd.ni_vp) 1055 vrele(nd.ni_dvp); 1056 else 1057 vput(nd.ni_dvp); 1058 vrele(nd.ni_vp); 1059 error = EEXIST; 1060 goto out; 1061 } 1062 VATTR_NULL(&vattr); 1063 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1064 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1065 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1066 out: 1067 FREE(path, M_NAMEI); 1068 return (error); 1069 } 1070 1071 /* 1072 * Delete a whiteout from the filesystem. 1073 */ 1074 /* ARGSUSED */ 1075 int 1076 sys_undelete(p, v, retval) 1077 struct proc *p; 1078 void *v; 1079 register_t *retval; 1080 { 1081 register struct sys_undelete_args /* { 1082 syscallarg(const char *) path; 1083 } */ *uap = v; 1084 int error; 1085 struct nameidata nd; 1086 1087 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1088 SCARG(uap, path), p); 1089 error = namei(&nd); 1090 if (error) 1091 return (error); 1092 1093 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1094 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1095 if (nd.ni_dvp == nd.ni_vp) 1096 vrele(nd.ni_dvp); 1097 else 1098 vput(nd.ni_dvp); 1099 if (nd.ni_vp) 1100 vrele(nd.ni_vp); 1101 return (EEXIST); 1102 } 1103 1104 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1105 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1106 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1107 vput(nd.ni_dvp); 1108 return (error); 1109 } 1110 1111 /* 1112 * Delete a name from the filesystem. 1113 */ 1114 /* ARGSUSED */ 1115 int 1116 sys_unlink(p, v, retval) 1117 struct proc *p; 1118 void *v; 1119 register_t *retval; 1120 { 1121 struct sys_unlink_args /* { 1122 syscallarg(const char *) path; 1123 } */ *uap = v; 1124 register struct vnode *vp; 1125 int error; 1126 struct nameidata nd; 1127 1128 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1129 SCARG(uap, path), p); 1130 if ((error = namei(&nd)) != 0) 1131 return (error); 1132 vp = nd.ni_vp; 1133 1134 /* 1135 * The root of a mounted filesystem cannot be deleted. 1136 */ 1137 if (vp->v_flag & VROOT) { 1138 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1139 if (nd.ni_dvp == vp) 1140 vrele(nd.ni_dvp); 1141 else 1142 vput(nd.ni_dvp); 1143 vput(vp); 1144 error = EBUSY; 1145 goto out; 1146 } 1147 1148 #if defined(UVM) 1149 (void)uvm_vnp_uncache(vp); 1150 #else 1151 (void)vnode_pager_uncache(vp); 1152 #endif 1153 1154 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1155 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1156 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1157 out: 1158 return (error); 1159 } 1160 1161 /* 1162 * Reposition read/write file offset. 1163 */ 1164 int 1165 sys_lseek(p, v, retval) 1166 struct proc *p; 1167 void *v; 1168 register_t *retval; 1169 { 1170 register struct sys_lseek_args /* { 1171 syscallarg(int) fd; 1172 syscallarg(int) pad; 1173 syscallarg(off_t) offset; 1174 syscallarg(int) whence; 1175 } */ *uap = v; 1176 struct ucred *cred = p->p_ucred; 1177 register struct filedesc *fdp = p->p_fd; 1178 register struct file *fp; 1179 struct vnode *vp; 1180 struct vattr vattr; 1181 register off_t newoff; 1182 int error; 1183 1184 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1185 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1186 return (EBADF); 1187 1188 vp = (struct vnode *)fp->f_data; 1189 if (fp->f_type != DTYPE_VNODE 1190 #ifdef FIFO 1191 || vp->v_type == VFIFO 1192 #endif 1193 ) 1194 return (ESPIPE); 1195 1196 switch (SCARG(uap, whence)) { 1197 case SEEK_CUR: 1198 newoff = fp->f_offset + SCARG(uap, offset); 1199 break; 1200 case SEEK_END: 1201 error = VOP_GETATTR(vp, &vattr, cred, p); 1202 if (error) 1203 return (error); 1204 newoff = SCARG(uap, offset) + vattr.va_size; 1205 break; 1206 case SEEK_SET: 1207 newoff = SCARG(uap, offset); 1208 break; 1209 default: 1210 return (EINVAL); 1211 } 1212 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1213 return (error); 1214 1215 *(off_t *)retval = fp->f_offset = newoff; 1216 return (0); 1217 } 1218 1219 /* 1220 * Check access permissions. 1221 */ 1222 int 1223 sys_access(p, v, retval) 1224 struct proc *p; 1225 void *v; 1226 register_t *retval; 1227 { 1228 register struct sys_access_args /* { 1229 syscallarg(const char *) path; 1230 syscallarg(int) flags; 1231 } */ *uap = v; 1232 register struct ucred *cred = p->p_ucred; 1233 register struct vnode *vp; 1234 int error, flags, t_gid, t_uid; 1235 struct nameidata nd; 1236 1237 t_uid = cred->cr_uid; 1238 t_gid = cred->cr_gid; 1239 cred->cr_uid = p->p_cred->p_ruid; 1240 cred->cr_gid = p->p_cred->p_rgid; 1241 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1242 SCARG(uap, path), p); 1243 if ((error = namei(&nd)) != 0) 1244 goto out1; 1245 vp = nd.ni_vp; 1246 1247 /* Flags == 0 means only check for existence. */ 1248 if (SCARG(uap, flags)) { 1249 flags = 0; 1250 if (SCARG(uap, flags) & R_OK) 1251 flags |= VREAD; 1252 if (SCARG(uap, flags) & W_OK) 1253 flags |= VWRITE; 1254 if (SCARG(uap, flags) & X_OK) 1255 flags |= VEXEC; 1256 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1257 error = VOP_ACCESS(vp, flags, cred, p); 1258 } 1259 vput(vp); 1260 out1: 1261 cred->cr_uid = t_uid; 1262 cred->cr_gid = t_gid; 1263 return (error); 1264 } 1265 1266 /* 1267 * Get file status; this version follows links. 1268 */ 1269 /* ARGSUSED */ 1270 int 1271 sys___stat13(p, v, retval) 1272 struct proc *p; 1273 void *v; 1274 register_t *retval; 1275 { 1276 register struct sys___stat13_args /* { 1277 syscallarg(const char *) path; 1278 syscallarg(struct stat *) ub; 1279 } */ *uap = v; 1280 struct stat sb; 1281 int error; 1282 struct nameidata nd; 1283 1284 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1285 SCARG(uap, path), p); 1286 if ((error = namei(&nd)) != 0) 1287 return (error); 1288 error = vn_stat(nd.ni_vp, &sb, p); 1289 vput(nd.ni_vp); 1290 if (error) 1291 return (error); 1292 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1293 return (error); 1294 } 1295 1296 /* 1297 * Get file status; this version does not follow links. 1298 */ 1299 /* ARGSUSED */ 1300 int 1301 sys___lstat13(p, v, retval) 1302 struct proc *p; 1303 void *v; 1304 register_t *retval; 1305 { 1306 register struct sys___lstat13_args /* { 1307 syscallarg(const char *) path; 1308 syscallarg(struct stat *) ub; 1309 } */ *uap = v; 1310 struct stat sb; 1311 int error; 1312 struct nameidata nd; 1313 1314 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1315 SCARG(uap, path), p); 1316 if ((error = namei(&nd)) != 0) 1317 return (error); 1318 error = vn_stat(nd.ni_vp, &sb, p); 1319 vput(nd.ni_vp); 1320 if (error) 1321 return (error); 1322 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1323 return (error); 1324 } 1325 1326 /* 1327 * Get configurable pathname variables. 1328 */ 1329 /* ARGSUSED */ 1330 int 1331 sys_pathconf(p, v, retval) 1332 struct proc *p; 1333 void *v; 1334 register_t *retval; 1335 { 1336 register struct sys_pathconf_args /* { 1337 syscallarg(const char *) path; 1338 syscallarg(int) name; 1339 } */ *uap = v; 1340 int error; 1341 struct nameidata nd; 1342 1343 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1344 SCARG(uap, path), p); 1345 if ((error = namei(&nd)) != 0) 1346 return (error); 1347 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1348 vput(nd.ni_vp); 1349 return (error); 1350 } 1351 1352 /* 1353 * Return target name of a symbolic link. 1354 */ 1355 /* ARGSUSED */ 1356 int 1357 sys_readlink(p, v, retval) 1358 struct proc *p; 1359 void *v; 1360 register_t *retval; 1361 { 1362 register struct sys_readlink_args /* { 1363 syscallarg(const char *) path; 1364 syscallarg(char *) buf; 1365 syscallarg(int) count; 1366 } */ *uap = v; 1367 register struct vnode *vp; 1368 struct iovec aiov; 1369 struct uio auio; 1370 int error; 1371 struct nameidata nd; 1372 1373 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1374 SCARG(uap, path), p); 1375 if ((error = namei(&nd)) != 0) 1376 return (error); 1377 vp = nd.ni_vp; 1378 if (vp->v_type != VLNK) 1379 error = EINVAL; 1380 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1381 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1382 aiov.iov_base = SCARG(uap, buf); 1383 aiov.iov_len = SCARG(uap, count); 1384 auio.uio_iov = &aiov; 1385 auio.uio_iovcnt = 1; 1386 auio.uio_offset = 0; 1387 auio.uio_rw = UIO_READ; 1388 auio.uio_segflg = UIO_USERSPACE; 1389 auio.uio_procp = p; 1390 auio.uio_resid = SCARG(uap, count); 1391 error = VOP_READLINK(vp, &auio, p->p_ucred); 1392 } 1393 vput(vp); 1394 *retval = SCARG(uap, count) - auio.uio_resid; 1395 return (error); 1396 } 1397 1398 /* 1399 * Change flags of a file given a path name. 1400 */ 1401 /* ARGSUSED */ 1402 int 1403 sys_chflags(p, v, retval) 1404 struct proc *p; 1405 void *v; 1406 register_t *retval; 1407 { 1408 register struct sys_chflags_args /* { 1409 syscallarg(const char *) path; 1410 syscallarg(u_long) flags; 1411 } */ *uap = v; 1412 register struct vnode *vp; 1413 struct vattr vattr; 1414 int error; 1415 struct nameidata nd; 1416 1417 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1418 if ((error = namei(&nd)) != 0) 1419 return (error); 1420 vp = nd.ni_vp; 1421 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1422 VOP_LOCK(vp); 1423 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1424 error = EROFS; 1425 else { 1426 VATTR_NULL(&vattr); 1427 vattr.va_flags = SCARG(uap, flags); 1428 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1429 } 1430 vput(vp); 1431 return (error); 1432 } 1433 1434 /* 1435 * Change flags of a file given a file descriptor. 1436 */ 1437 /* ARGSUSED */ 1438 int 1439 sys_fchflags(p, v, retval) 1440 struct proc *p; 1441 void *v; 1442 register_t *retval; 1443 { 1444 register struct sys_fchflags_args /* { 1445 syscallarg(int) fd; 1446 syscallarg(u_long) flags; 1447 } */ *uap = v; 1448 struct vattr vattr; 1449 struct vnode *vp; 1450 struct file *fp; 1451 int error; 1452 1453 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1454 return (error); 1455 vp = (struct vnode *)fp->f_data; 1456 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1457 VOP_LOCK(vp); 1458 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1459 error = EROFS; 1460 else { 1461 VATTR_NULL(&vattr); 1462 vattr.va_flags = SCARG(uap, flags); 1463 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1464 } 1465 VOP_UNLOCK(vp); 1466 return (error); 1467 } 1468 1469 /* 1470 * Change mode of a file given path name; this version follows links. 1471 */ 1472 /* ARGSUSED */ 1473 int 1474 sys_chmod(p, v, retval) 1475 struct proc *p; 1476 void *v; 1477 register_t *retval; 1478 { 1479 register struct sys_chmod_args /* { 1480 syscallarg(const char *) path; 1481 syscallarg(int) mode; 1482 } */ *uap = v; 1483 int error; 1484 struct nameidata nd; 1485 1486 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1487 if ((error = namei(&nd)) != 0) 1488 return (error); 1489 1490 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1491 1492 vrele(nd.ni_vp); 1493 return (error); 1494 } 1495 1496 /* 1497 * Change mode of a file given a file descriptor. 1498 */ 1499 /* ARGSUSED */ 1500 int 1501 sys_fchmod(p, v, retval) 1502 struct proc *p; 1503 void *v; 1504 register_t *retval; 1505 { 1506 register struct sys_fchmod_args /* { 1507 syscallarg(int) fd; 1508 syscallarg(int) mode; 1509 } */ *uap = v; 1510 struct file *fp; 1511 int error; 1512 1513 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1514 return (error); 1515 1516 return (change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p)); 1517 } 1518 1519 /* 1520 * Change mode of a file given path name; this version does not follow links. 1521 */ 1522 /* ARGSUSED */ 1523 int 1524 sys_lchmod(p, v, retval) 1525 struct proc *p; 1526 void *v; 1527 register_t *retval; 1528 { 1529 register struct sys_lchmod_args /* { 1530 syscallarg(const char *) path; 1531 syscallarg(int) mode; 1532 } */ *uap = v; 1533 int error; 1534 struct nameidata nd; 1535 1536 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1537 if ((error = namei(&nd)) != 0) 1538 return (error); 1539 1540 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1541 1542 vrele(nd.ni_vp); 1543 return (error); 1544 } 1545 1546 /* 1547 * Common routine to set mode given a vnode. 1548 */ 1549 static int 1550 change_mode(vp, mode, p) 1551 struct vnode *vp; 1552 int mode; 1553 struct proc *p; 1554 { 1555 struct vattr vattr; 1556 int error; 1557 1558 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1559 VOP_LOCK(vp); 1560 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1561 error = EROFS; 1562 else { 1563 VATTR_NULL(&vattr); 1564 vattr.va_mode = mode & ALLPERMS; 1565 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1566 } 1567 VOP_UNLOCK(vp); 1568 return (error); 1569 } 1570 1571 /* 1572 * Set ownership given a path name; this version follows links. 1573 */ 1574 /* ARGSUSED */ 1575 int 1576 sys_chown(p, v, retval) 1577 struct proc *p; 1578 void *v; 1579 register_t *retval; 1580 { 1581 register struct sys_chown_args /* { 1582 syscallarg(const char *) path; 1583 syscallarg(uid_t) uid; 1584 syscallarg(gid_t) gid; 1585 } */ *uap = v; 1586 int error; 1587 struct nameidata nd; 1588 1589 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1590 if ((error = namei(&nd)) != 0) 1591 return (error); 1592 1593 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p); 1594 1595 vrele(nd.ni_vp); 1596 return (error); 1597 } 1598 1599 /* 1600 * Set ownership given a file descriptor. 1601 */ 1602 /* ARGSUSED */ 1603 int 1604 sys_fchown(p, v, retval) 1605 struct proc *p; 1606 void *v; 1607 register_t *retval; 1608 { 1609 register struct sys_fchown_args /* { 1610 syscallarg(int) fd; 1611 syscallarg(uid_t) uid; 1612 syscallarg(gid_t) gid; 1613 } */ *uap = v; 1614 int error; 1615 struct file *fp; 1616 1617 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1618 return (error); 1619 1620 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1621 SCARG(uap, gid), p)); 1622 } 1623 1624 /* 1625 * Set ownership given a path name; this version does not follow links. 1626 */ 1627 /* ARGSUSED */ 1628 int 1629 sys_lchown(p, v, retval) 1630 struct proc *p; 1631 void *v; 1632 register_t *retval; 1633 { 1634 register struct sys_lchown_args /* { 1635 syscallarg(const char *) path; 1636 syscallarg(uid_t) uid; 1637 syscallarg(gid_t) gid; 1638 } */ *uap = v; 1639 int error; 1640 struct nameidata nd; 1641 1642 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1643 if ((error = namei(&nd)) != 0) 1644 return (error); 1645 1646 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p); 1647 1648 vrele(nd.ni_vp); 1649 return (error); 1650 } 1651 1652 /* 1653 * Common routine to set ownership given a vnode. 1654 */ 1655 static int 1656 change_owner(vp, uid, gid, p) 1657 register struct vnode *vp; 1658 uid_t uid; 1659 gid_t gid; 1660 struct proc *p; 1661 { 1662 struct vattr vattr; 1663 mode_t newmode = VNOVAL; 1664 int error; 1665 1666 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1667 VOP_LOCK(vp); 1668 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 1669 error = EROFS; 1670 goto out; 1671 } 1672 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 1673 goto out; 1674 1675 /* 1676 * Unless the caller is the superuser, clear the (S_ISUID | S_ISGID) 1677 * bits, but alter va_mode only if those are actually set on the vnode. 1678 */ 1679 if ((suser(p->p_ucred, NULL) != 0) && 1680 (vattr.va_mode & (S_ISUID | S_ISGID))) 1681 newmode = vattr.va_mode & ~(S_ISUID | S_ISGID); 1682 1683 VATTR_NULL(&vattr); 1684 vattr.va_uid = uid; 1685 vattr.va_gid = gid; 1686 vattr.va_mode = newmode; 1687 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1688 1689 out: 1690 VOP_UNLOCK(vp); 1691 return (error); 1692 } 1693 1694 /* 1695 * Set the access and modification times given a path name; this 1696 * version follows links. 1697 */ 1698 /* ARGSUSED */ 1699 int 1700 sys_utimes(p, v, retval) 1701 struct proc *p; 1702 void *v; 1703 register_t *retval; 1704 { 1705 register struct sys_utimes_args /* { 1706 syscallarg(const char *) path; 1707 syscallarg(const struct timeval *) tptr; 1708 } */ *uap = v; 1709 int error; 1710 struct nameidata nd; 1711 1712 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1713 if ((error = namei(&nd)) != 0) 1714 return (error); 1715 1716 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1717 1718 vrele(nd.ni_vp); 1719 return (error); 1720 } 1721 1722 /* 1723 * Set the access and modification times given a file descriptor. 1724 */ 1725 /* ARGSUSED */ 1726 int 1727 sys_futimes(p, v, retval) 1728 struct proc *p; 1729 void *v; 1730 register_t *retval; 1731 { 1732 register struct sys_futimes_args /* { 1733 syscallarg(int) fd; 1734 syscallarg(const struct timeval *) tptr; 1735 } */ *uap = v; 1736 int error; 1737 struct file *fp; 1738 1739 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1740 return (error); 1741 1742 return (change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), 1743 p)); 1744 } 1745 1746 /* 1747 * Set the access and modification times given a path name; this 1748 * version does not follow links. 1749 */ 1750 /* ARGSUSED */ 1751 int 1752 sys_lutimes(p, v, retval) 1753 struct proc *p; 1754 void *v; 1755 register_t *retval; 1756 { 1757 register struct sys_lutimes_args /* { 1758 syscallarg(const char *) path; 1759 syscallarg(const struct timeval *) tptr; 1760 } */ *uap = v; 1761 int error; 1762 struct nameidata nd; 1763 1764 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1765 if ((error = namei(&nd)) != 0) 1766 return (error); 1767 1768 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1769 1770 vrele(nd.ni_vp); 1771 return (error); 1772 } 1773 1774 /* 1775 * Common routine to set access and modification times given a vnode. 1776 */ 1777 static int 1778 change_utimes(vp, tptr, p) 1779 struct vnode *vp; 1780 const struct timeval *tptr; 1781 struct proc *p; 1782 { 1783 struct timeval tv[2]; 1784 struct vattr vattr; 1785 int error; 1786 1787 VATTR_NULL(&vattr); 1788 if (tptr == NULL) { 1789 microtime(&tv[0]); 1790 tv[1] = tv[0]; 1791 vattr.va_vaflags |= VA_UTIMES_NULL; 1792 } else { 1793 error = copyin(tptr, tv, sizeof (tv)); 1794 if (error) 1795 return (error); 1796 } 1797 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1798 VOP_LOCK(vp); 1799 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1800 error = EROFS; 1801 else { 1802 vattr.va_atime.tv_sec = tv[0].tv_sec; 1803 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1804 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1805 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1806 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1807 } 1808 VOP_UNLOCK(vp); 1809 return (error); 1810 } 1811 1812 /* 1813 * Truncate a file given its path name. 1814 */ 1815 /* ARGSUSED */ 1816 int 1817 sys_truncate(p, v, retval) 1818 struct proc *p; 1819 void *v; 1820 register_t *retval; 1821 { 1822 register struct sys_truncate_args /* { 1823 syscallarg(const char *) path; 1824 syscallarg(int) pad; 1825 syscallarg(off_t) length; 1826 } */ *uap = v; 1827 register struct vnode *vp; 1828 struct vattr vattr; 1829 int error; 1830 struct nameidata nd; 1831 1832 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1833 if ((error = namei(&nd)) != 0) 1834 return (error); 1835 vp = nd.ni_vp; 1836 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1837 VOP_LOCK(vp); 1838 if (vp->v_type == VDIR) 1839 error = EISDIR; 1840 else if ((error = vn_writechk(vp)) == 0 && 1841 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1842 VATTR_NULL(&vattr); 1843 vattr.va_size = SCARG(uap, length); 1844 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1845 } 1846 vput(vp); 1847 return (error); 1848 } 1849 1850 /* 1851 * Truncate a file given a file descriptor. 1852 */ 1853 /* ARGSUSED */ 1854 int 1855 sys_ftruncate(p, v, retval) 1856 struct proc *p; 1857 void *v; 1858 register_t *retval; 1859 { 1860 register struct sys_ftruncate_args /* { 1861 syscallarg(int) fd; 1862 syscallarg(int) pad; 1863 syscallarg(off_t) length; 1864 } */ *uap = v; 1865 struct vattr vattr; 1866 struct vnode *vp; 1867 struct file *fp; 1868 int error; 1869 1870 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1871 return (error); 1872 if ((fp->f_flag & FWRITE) == 0) 1873 return (EINVAL); 1874 vp = (struct vnode *)fp->f_data; 1875 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1876 VOP_LOCK(vp); 1877 if (vp->v_type == VDIR) 1878 error = EISDIR; 1879 else if ((error = vn_writechk(vp)) == 0) { 1880 VATTR_NULL(&vattr); 1881 vattr.va_size = SCARG(uap, length); 1882 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1883 } 1884 VOP_UNLOCK(vp); 1885 return (error); 1886 } 1887 1888 /* 1889 * Sync an open file. 1890 */ 1891 /* ARGSUSED */ 1892 int 1893 sys_fsync(p, v, retval) 1894 struct proc *p; 1895 void *v; 1896 register_t *retval; 1897 { 1898 struct sys_fsync_args /* { 1899 syscallarg(int) fd; 1900 } */ *uap = v; 1901 register struct vnode *vp; 1902 struct file *fp; 1903 int error; 1904 1905 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1906 return (error); 1907 vp = (struct vnode *)fp->f_data; 1908 VOP_LOCK(vp); 1909 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p); 1910 VOP_UNLOCK(vp); 1911 return (error); 1912 } 1913 1914 /* 1915 * Rename files, (standard) BSD semantics frontend. 1916 */ 1917 /* ARGSUSED */ 1918 int 1919 sys_rename(p, v, retval) 1920 struct proc *p; 1921 void *v; 1922 register_t *retval; 1923 { 1924 register struct sys_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, 0)); 1930 } 1931 1932 /* 1933 * Rename files, POSIX semantics frontend. 1934 */ 1935 /* ARGSUSED */ 1936 int 1937 sys_posix_rename(p, v, retval) 1938 struct proc *p; 1939 void *v; 1940 register_t *retval; 1941 { 1942 register struct sys_posix_rename_args /* { 1943 syscallarg(const char *) from; 1944 syscallarg(const char *) to; 1945 } */ *uap = v; 1946 1947 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 1948 } 1949 1950 /* 1951 * Rename files. Source and destination must either both be directories, 1952 * or both not be directories. If target is a directory, it must be empty. 1953 * If `from' and `to' refer to the same object, the value of the `retain' 1954 * argument is used to determine whether `from' will be 1955 * 1956 * (retain == 0) deleted unless `from' and `to' refer to the same 1957 * object in the file system's name space (BSD). 1958 * (retain == 1) always retained (POSIX). 1959 */ 1960 static int 1961 rename_files(from, to, p, retain) 1962 const char *from, *to; 1963 struct proc *p; 1964 int retain; 1965 { 1966 register struct vnode *tvp, *fvp, *tdvp; 1967 struct nameidata fromnd, tond; 1968 int error; 1969 1970 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 1971 from, p); 1972 if ((error = namei(&fromnd)) != 0) 1973 return (error); 1974 fvp = fromnd.ni_vp; 1975 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 1976 UIO_USERSPACE, to, p); 1977 if ((error = namei(&tond)) != 0) { 1978 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1979 vrele(fromnd.ni_dvp); 1980 vrele(fvp); 1981 goto out1; 1982 } 1983 tdvp = tond.ni_dvp; 1984 tvp = tond.ni_vp; 1985 1986 if (tvp != NULL) { 1987 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 1988 error = ENOTDIR; 1989 goto out; 1990 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 1991 error = EISDIR; 1992 goto out; 1993 } 1994 } 1995 1996 if (fvp == tdvp) 1997 error = EINVAL; 1998 1999 /* 2000 * Source and destination refer to the same object. 2001 */ 2002 if (fvp == tvp) { 2003 if (retain) 2004 error = -1; 2005 else if (fromnd.ni_dvp == tdvp && 2006 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2007 !bcmp(fromnd.ni_cnd.cn_nameptr, 2008 tond.ni_cnd.cn_nameptr, 2009 fromnd.ni_cnd.cn_namelen)) 2010 error = -1; 2011 } 2012 2013 out: 2014 if (!error) { 2015 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2016 if (fromnd.ni_dvp != tdvp) 2017 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2018 if (tvp) { 2019 #if defined(UVM) 2020 (void)uvm_vnp_uncache(tvp); 2021 #else 2022 (void)vnode_pager_uncache(tvp); 2023 #endif 2024 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2025 } 2026 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2027 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2028 } else { 2029 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2030 if (tdvp == tvp) 2031 vrele(tdvp); 2032 else 2033 vput(tdvp); 2034 if (tvp) 2035 vput(tvp); 2036 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2037 vrele(fromnd.ni_dvp); 2038 vrele(fvp); 2039 } 2040 vrele(tond.ni_startdir); 2041 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2042 out1: 2043 if (fromnd.ni_startdir) 2044 vrele(fromnd.ni_startdir); 2045 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2046 return (error == -1 ? 0 : error); 2047 } 2048 2049 /* 2050 * Make a directory file. 2051 */ 2052 /* ARGSUSED */ 2053 int 2054 sys_mkdir(p, v, retval) 2055 struct proc *p; 2056 void *v; 2057 register_t *retval; 2058 { 2059 register struct sys_mkdir_args /* { 2060 syscallarg(const char *) path; 2061 syscallarg(int) mode; 2062 } */ *uap = v; 2063 register struct vnode *vp; 2064 struct vattr vattr; 2065 int error; 2066 struct nameidata nd; 2067 2068 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2069 if ((error = namei(&nd)) != 0) 2070 return (error); 2071 vp = nd.ni_vp; 2072 if (vp != NULL) { 2073 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2074 if (nd.ni_dvp == vp) 2075 vrele(nd.ni_dvp); 2076 else 2077 vput(nd.ni_dvp); 2078 vrele(vp); 2079 return (EEXIST); 2080 } 2081 VATTR_NULL(&vattr); 2082 vattr.va_type = VDIR; 2083 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 2084 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2085 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2086 if (!error) 2087 vput(nd.ni_vp); 2088 return (error); 2089 } 2090 2091 /* 2092 * Remove a directory file. 2093 */ 2094 /* ARGSUSED */ 2095 int 2096 sys_rmdir(p, v, retval) 2097 struct proc *p; 2098 void *v; 2099 register_t *retval; 2100 { 2101 struct sys_rmdir_args /* { 2102 syscallarg(const char *) path; 2103 } */ *uap = v; 2104 register struct vnode *vp; 2105 int error; 2106 struct nameidata nd; 2107 2108 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2109 SCARG(uap, path), p); 2110 if ((error = namei(&nd)) != 0) 2111 return (error); 2112 vp = nd.ni_vp; 2113 if (vp->v_type != VDIR) { 2114 error = ENOTDIR; 2115 goto out; 2116 } 2117 /* 2118 * No rmdir "." please. 2119 */ 2120 if (nd.ni_dvp == vp) { 2121 error = EINVAL; 2122 goto out; 2123 } 2124 /* 2125 * The root of a mounted filesystem cannot be deleted. 2126 */ 2127 if (vp->v_flag & VROOT) 2128 error = EBUSY; 2129 out: 2130 if (!error) { 2131 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2132 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2133 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2134 } else { 2135 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2136 if (nd.ni_dvp == vp) 2137 vrele(nd.ni_dvp); 2138 else 2139 vput(nd.ni_dvp); 2140 vput(vp); 2141 } 2142 return (error); 2143 } 2144 2145 /* 2146 * Read a block of directory entries in a file system independent format. 2147 */ 2148 int 2149 sys_getdents(p, v, retval) 2150 struct proc *p; 2151 void *v; 2152 register_t *retval; 2153 { 2154 register struct sys_getdents_args /* { 2155 syscallarg(int) fd; 2156 syscallarg(char *) buf; 2157 syscallarg(size_t) count; 2158 } */ *uap = v; 2159 struct file *fp; 2160 int error, done; 2161 2162 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2163 return (error); 2164 if ((fp->f_flag & FREAD) == 0) 2165 return (EBADF); 2166 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2167 SCARG(uap, count), &done, p, 0, 0); 2168 *retval = done; 2169 return (error); 2170 } 2171 2172 /* 2173 * Set the mode mask for creation of filesystem nodes. 2174 */ 2175 int 2176 sys_umask(p, v, retval) 2177 struct proc *p; 2178 void *v; 2179 register_t *retval; 2180 { 2181 struct sys_umask_args /* { 2182 syscallarg(mode_t) newmask; 2183 } */ *uap = v; 2184 register struct filedesc *fdp; 2185 2186 fdp = p->p_fd; 2187 *retval = fdp->fd_cmask; 2188 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2189 return (0); 2190 } 2191 2192 /* 2193 * Void all references to file by ripping underlying filesystem 2194 * away from vnode. 2195 */ 2196 /* ARGSUSED */ 2197 int 2198 sys_revoke(p, v, retval) 2199 struct proc *p; 2200 void *v; 2201 register_t *retval; 2202 { 2203 register struct sys_revoke_args /* { 2204 syscallarg(const char *) path; 2205 } */ *uap = v; 2206 register struct vnode *vp; 2207 struct vattr vattr; 2208 int error; 2209 struct nameidata nd; 2210 2211 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2212 if ((error = namei(&nd)) != 0) 2213 return (error); 2214 vp = nd.ni_vp; 2215 if (vp->v_type != VCHR && vp->v_type != VBLK) { 2216 error = EINVAL; 2217 goto out; 2218 } 2219 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2220 goto out; 2221 if (p->p_ucred->cr_uid != vattr.va_uid && 2222 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2223 goto out; 2224 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2225 vgoneall(vp); 2226 out: 2227 vrele(vp); 2228 return (error); 2229 } 2230 2231 /* 2232 * Convert a user file descriptor to a kernel file entry. 2233 */ 2234 int 2235 getvnode(fdp, fd, fpp) 2236 struct filedesc *fdp; 2237 int fd; 2238 struct file **fpp; 2239 { 2240 struct vnode *vp; 2241 struct file *fp; 2242 2243 if ((u_int)fd >= fdp->fd_nfiles || 2244 (fp = fdp->fd_ofiles[fd]) == NULL) 2245 return (EBADF); 2246 if (fp->f_type != DTYPE_VNODE) 2247 return (EINVAL); 2248 vp = (struct vnode *)fp->f_data; 2249 if (vp->v_type == VBAD) 2250 return (EBADF); 2251 *fpp = fp; 2252 return (0); 2253 } 2254
Indexes created Mon Sep 29 21:09:56 GMT 2025