vfs_syscalls.c revision 1.111
1 /* $NetBSD: vfs_syscalls.c,v 1.111 1998/02/10 14:09:55 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 "opt_uvm.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/namei.h> 48 #include <sys/filedesc.h> 49 #include <sys/kernel.h> 50 #include <sys/file.h> 51 #include <sys/stat.h> 52 #include <sys/vnode.h> 53 #include <sys/mount.h> 54 #include <sys/proc.h> 55 #include <sys/uio.h> 56 #include <sys/malloc.h> 57 #include <sys/dirent.h> 58 59 #include <sys/syscallargs.h> 60 61 #include <vm/vm.h> 62 #include <sys/sysctl.h> 63 64 #if defined(UVM) 65 #include <uvm/uvm_extern.h> 66 #endif 67 68 static int change_dir __P((struct nameidata *, struct proc *)); 69 static int change_mode __P((struct vnode *, int, struct proc *p)); 70 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *)); 71 static int change_utimes __P((struct vnode *vp, const struct timeval *, 72 struct proc *p)); 73 static int rename_files __P((const char *, const char *, struct proc *, int)); 74 75 void checkdirs __P((struct vnode *)); 76 int dounmount __P((struct mount *, int, struct proc *)); 77 78 /* 79 * Virtual File System System Calls 80 */ 81 82 /* 83 * Mount a file system. 84 */ 85 86 #if defined(COMPAT_09) || defined(COMPAT_43) 87 /* 88 * This table is used to maintain compatibility with 4.3BSD 89 * and NetBSD 0.9 mount syscalls. Note, the order is important! 90 */ 91 static const char *mountcompatnames[] = { 92 NULL, /* 0 = MOUNT_NONE */ 93 MOUNT_FFS, /* 1 */ 94 MOUNT_NFS, /* 2 */ 95 MOUNT_MFS, /* 3 */ 96 MOUNT_MSDOS, /* 4 */ 97 MOUNT_LFS, /* 5 */ 98 NULL, /* 6 = MOUNT_LOFS */ 99 MOUNT_FDESC, /* 7 */ 100 MOUNT_PORTAL, /* 8 */ 101 MOUNT_NULL, /* 9 */ 102 MOUNT_UMAP, /* 10 */ 103 MOUNT_KERNFS, /* 11 */ 104 MOUNT_PROCFS, /* 12 */ 105 MOUNT_AFS, /* 13 */ 106 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 107 MOUNT_UNION, /* 15 */ 108 MOUNT_ADOSFS, /* 16 */ 109 MOUNT_EXT2FS, /* 17 */ 110 }; 111 static const int nmountcompatnames = sizeof(mountcompatnames) / 112 sizeof(mountcompatnames[0]); 113 #endif /* COMPAT_09 || COMPAT_43 */ 114 115 /* ARGSUSED */ 116 int 117 sys_mount(p, v, retval) 118 struct proc *p; 119 void *v; 120 register_t *retval; 121 { 122 register struct sys_mount_args /* { 123 syscallarg(const char *) type; 124 syscallarg(const char *) path; 125 syscallarg(int) flags; 126 syscallarg(void *) data; 127 } */ *uap = v; 128 register struct vnode *vp; 129 register struct mount *mp; 130 int error, flag = 0; 131 char fstypename[MFSNAMELEN]; 132 struct vattr va; 133 struct nameidata nd; 134 struct vfsops *vfs; 135 136 /* 137 * Get vnode to be covered 138 */ 139 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 140 SCARG(uap, path), p); 141 if ((error = namei(&nd)) != 0) 142 return (error); 143 vp = nd.ni_vp; 144 if (SCARG(uap, flags) & MNT_UPDATE) { 145 if ((vp->v_flag & VROOT) == 0) { 146 vput(vp); 147 return (EINVAL); 148 } 149 mp = vp->v_mount; 150 flag = mp->mnt_flag; 151 vfs = mp->mnt_op; 152 /* 153 * We only allow the filesystem to be reloaded if it 154 * is currently mounted read-only. 155 */ 156 if ((SCARG(uap, flags) & MNT_RELOAD) && 157 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 158 vput(vp); 159 return (EOPNOTSUPP); /* Needs translation */ 160 } 161 mp->mnt_flag |= 162 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 163 /* 164 * Only root, or the user that did the original mount is 165 * permitted to update it. 166 */ 167 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 168 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 169 vput(vp); 170 return (error); 171 } 172 /* 173 * Do not allow NFS export by non-root users. Silently 174 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 175 */ 176 if (p->p_ucred->cr_uid != 0) { 177 if (SCARG(uap, flags) & MNT_EXPORTED) { 178 vput(vp); 179 return (EPERM); 180 } 181 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 182 } 183 VOP_UNLOCK(vp); 184 goto update; 185 } 186 /* 187 * If the user is not root, ensure that they own the directory 188 * onto which we are attempting to mount. 189 */ 190 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 191 (va.va_uid != p->p_ucred->cr_uid && 192 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 193 vput(vp); 194 return (error); 195 } 196 /* 197 * Do not allow NFS export by non-root users. Silently 198 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 199 */ 200 if (p->p_ucred->cr_uid != 0) { 201 if (SCARG(uap, flags) & MNT_EXPORTED) { 202 vput(vp); 203 return (EPERM); 204 } 205 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 206 } 207 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 208 return (error); 209 if (vp->v_type != VDIR) { 210 vput(vp); 211 return (ENOTDIR); 212 } 213 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 214 if (error) { 215 #if defined(COMPAT_09) || defined(COMPAT_43) 216 /* 217 * Historically filesystem types were identified by number. 218 * If we get an integer for the filesystem type instead of a 219 * string, we check to see if it matches one of the historic 220 * filesystem types. 221 */ 222 u_long fsindex = (u_long)SCARG(uap, type); 223 if (fsindex >= nmountcompatnames || 224 mountcompatnames[fsindex] == NULL) { 225 vput(vp); 226 return (ENODEV); 227 } 228 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 229 #else 230 vput(vp); 231 return (error); 232 #endif 233 } 234 #ifdef COMPAT_10 235 /* Accept `ufs' as an alias for `ffs'. */ 236 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 237 strncpy(fstypename, "ffs", MFSNAMELEN); 238 #endif 239 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 240 vput(vp); 241 return (ENODEV); 242 } 243 if (vp->v_mountedhere != NULL) { 244 vput(vp); 245 return (EBUSY); 246 } 247 248 /* 249 * Allocate and initialize the file system. 250 */ 251 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 252 M_MOUNT, M_WAITOK); 253 bzero((char *)mp, (u_long)sizeof(struct mount)); 254 mp->mnt_op = vfs; 255 if ((error = vfs_lock(mp)) != 0) { 256 free((caddr_t)mp, M_MOUNT); 257 vput(vp); 258 return (error); 259 } 260 /* Do this early in case we block later. */ 261 vfs->vfs_refcount++; 262 vp->v_mountedhere = mp; 263 mp->mnt_vnodecovered = vp; 264 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 265 update: 266 /* 267 * Set the mount level flags. 268 */ 269 if (SCARG(uap, flags) & MNT_RDONLY) 270 mp->mnt_flag |= MNT_RDONLY; 271 else if (mp->mnt_flag & MNT_RDONLY) 272 mp->mnt_flag |= MNT_WANTRDWR; 273 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 274 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 275 MNT_NOATIME | MNT_SYMPERM); 276 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 277 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 278 MNT_NOCOREDUMP | MNT_NOATIME | MNT_SYMPERM); 279 /* 280 * Mount the filesystem. 281 */ 282 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 283 if (mp->mnt_flag & MNT_UPDATE) { 284 vrele(vp); 285 if (mp->mnt_flag & MNT_WANTRDWR) 286 mp->mnt_flag &= ~MNT_RDONLY; 287 mp->mnt_flag &=~ 288 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 289 if (error) 290 mp->mnt_flag = flag; 291 return (error); 292 } 293 /* 294 * Put the new filesystem on the mount list after root. 295 */ 296 cache_purge(vp); 297 if (!error) { 298 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 299 checkdirs(vp); 300 VOP_UNLOCK(vp); 301 vfs_unlock(mp); 302 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 303 error = VFS_START(mp, 0, p); 304 } else { 305 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 306 vfs->vfs_refcount--; 307 vfs_unlock(mp); 308 free((caddr_t)mp, M_MOUNT); 309 vput(vp); 310 } 311 return (error); 312 } 313 314 /* 315 * Scan all active processes to see if any of them have a current 316 * or root directory onto which the new filesystem has just been 317 * mounted. If so, replace them with the new mount point. 318 */ 319 void 320 checkdirs(olddp) 321 struct vnode *olddp; 322 { 323 struct filedesc *fdp; 324 struct vnode *newdp; 325 struct proc *p; 326 327 if (olddp->v_usecount == 1) 328 return; 329 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 330 panic("mount: lost mount"); 331 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 332 fdp = p->p_fd; 333 if (fdp->fd_cdir == olddp) { 334 vrele(fdp->fd_cdir); 335 VREF(newdp); 336 fdp->fd_cdir = newdp; 337 } 338 if (fdp->fd_rdir == olddp) { 339 vrele(fdp->fd_rdir); 340 VREF(newdp); 341 fdp->fd_rdir = newdp; 342 } 343 } 344 if (rootvnode == olddp) { 345 vrele(rootvnode); 346 VREF(newdp); 347 rootvnode = newdp; 348 } 349 vput(newdp); 350 } 351 352 /* 353 * Unmount a file system. 354 * 355 * Note: unmount takes a path to the vnode mounted on as argument, 356 * not special file (as before). 357 */ 358 /* ARGSUSED */ 359 int 360 sys_unmount(p, v, retval) 361 struct proc *p; 362 void *v; 363 register_t *retval; 364 { 365 register struct sys_unmount_args /* { 366 syscallarg(const char *) path; 367 syscallarg(int) flags; 368 } */ *uap = v; 369 register struct vnode *vp; 370 struct mount *mp; 371 int error; 372 struct nameidata nd; 373 374 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 375 SCARG(uap, path), p); 376 if ((error = namei(&nd)) != 0) 377 return (error); 378 vp = nd.ni_vp; 379 mp = vp->v_mount; 380 381 /* 382 * Only root, or the user that did the original mount is 383 * permitted to unmount this filesystem. 384 */ 385 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 386 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 387 vput(vp); 388 return (error); 389 } 390 391 /* 392 * Don't allow unmounting the root file system. 393 */ 394 if (mp->mnt_flag & MNT_ROOTFS) { 395 vput(vp); 396 return (EINVAL); 397 } 398 399 /* 400 * Must be the root of the filesystem 401 */ 402 if ((vp->v_flag & VROOT) == 0) { 403 vput(vp); 404 return (EINVAL); 405 } 406 vput(vp); 407 408 if (vfs_busy(mp)) 409 return (EBUSY); 410 411 return (dounmount(mp, SCARG(uap, flags), p)); 412 } 413 414 /* 415 * Do the actual file system unmount. File system is assumed to have been 416 * marked busy by the caller. 417 */ 418 int 419 dounmount(mp, flags, p) 420 register struct mount *mp; 421 int flags; 422 struct proc *p; 423 { 424 struct vnode *coveredvp; 425 int error; 426 427 coveredvp = mp->mnt_vnodecovered; 428 mp->mnt_flag |= MNT_UNMOUNT; 429 if ((error = vfs_lock(mp)) != 0) { 430 vfs_unbusy(mp); 431 return (error); 432 } 433 434 if (mp->mnt_flag & MNT_EXPUBLIC) 435 vfs_setpublicfs(NULL, NULL, NULL); 436 437 mp->mnt_flag &=~ MNT_ASYNC; 438 #if !defined(UVM) 439 vnode_pager_umount(mp); /* release cached vnodes */ 440 #endif 441 cache_purgevfs(mp); /* remove cache entries for this file sys */ 442 if ((error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0 || 443 (flags & MNT_FORCE)) 444 error = VFS_UNMOUNT(mp, flags, p); 445 mp->mnt_flag &= ~MNT_UNMOUNT; 446 vfs_unbusy(mp); 447 if (error) { 448 vfs_unlock(mp); 449 } else { 450 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 451 if (coveredvp != NULLVP) { 452 vrele(coveredvp); 453 coveredvp->v_mountedhere = (struct mount *)0; 454 } 455 mp->mnt_op->vfs_refcount--; 456 vfs_unlock(mp); 457 if (mp->mnt_vnodelist.lh_first != NULL) 458 panic("unmount: dangling vnode"); 459 free((caddr_t)mp, M_MOUNT); 460 } 461 return (error); 462 } 463 464 /* 465 * Sync each mounted filesystem. 466 */ 467 #ifdef DEBUG 468 int syncprt = 0; 469 struct ctldebug debug0 = { "syncprt", &syncprt }; 470 #endif 471 472 /* ARGSUSED */ 473 int 474 sys_sync(p, v, retval) 475 struct proc *p; 476 void *v; 477 register_t *retval; 478 { 479 register struct mount *mp, *nmp; 480 int asyncflag; 481 482 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 483 /* 484 * Get the prev pointer in case we hang on vfs_busy 485 * while we are being unmounted. 486 */ 487 nmp = mp->mnt_list.cqe_prev; 488 /* 489 * The lock check below is to avoid races with mount 490 * and unmount. 491 */ 492 if ((mp->mnt_flag & (MNT_MLOCK|MNT_RDONLY|MNT_MPBUSY)) == 0 && 493 !vfs_busy(mp)) { 494 asyncflag = mp->mnt_flag & MNT_ASYNC; 495 mp->mnt_flag &= ~MNT_ASYNC; 496 #if defined(UVM) 497 uvm_vnp_sync(mp); 498 #else 499 vnode_pager_sync(mp); 500 #endif 501 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 502 if (asyncflag) 503 mp->mnt_flag |= MNT_ASYNC; 504 /* 505 * Get the prev pointer again, as the prior filesystem 506 * might have been unmounted while we were sync'ing. 507 */ 508 nmp = mp->mnt_list.cqe_prev; 509 vfs_unbusy(mp); 510 } 511 } 512 #ifdef DEBUG 513 if (syncprt) 514 vfs_bufstats(); 515 #endif /* DEBUG */ 516 return (0); 517 } 518 519 /* 520 * Change filesystem quotas. 521 */ 522 /* ARGSUSED */ 523 int 524 sys_quotactl(p, v, retval) 525 struct proc *p; 526 void *v; 527 register_t *retval; 528 { 529 register struct sys_quotactl_args /* { 530 syscallarg(const char *) path; 531 syscallarg(int) cmd; 532 syscallarg(int) uid; 533 syscallarg(caddr_t) arg; 534 } */ *uap = v; 535 register struct mount *mp; 536 int error; 537 struct nameidata nd; 538 539 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 540 if ((error = namei(&nd)) != 0) 541 return (error); 542 mp = nd.ni_vp->v_mount; 543 vrele(nd.ni_vp); 544 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 545 SCARG(uap, arg), p)); 546 } 547 548 /* 549 * Get filesystem statistics. 550 */ 551 /* ARGSUSED */ 552 int 553 sys_statfs(p, v, retval) 554 struct proc *p; 555 void *v; 556 register_t *retval; 557 { 558 register struct sys_statfs_args /* { 559 syscallarg(const char *) path; 560 syscallarg(struct statfs *) buf; 561 } */ *uap = v; 562 register struct mount *mp; 563 register struct statfs *sp; 564 int error; 565 struct nameidata nd; 566 567 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 568 if ((error = namei(&nd)) != 0) 569 return (error); 570 mp = nd.ni_vp->v_mount; 571 sp = &mp->mnt_stat; 572 vrele(nd.ni_vp); 573 if ((error = VFS_STATFS(mp, sp, p)) != 0) 574 return (error); 575 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 576 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 577 } 578 579 /* 580 * Get filesystem statistics. 581 */ 582 /* ARGSUSED */ 583 int 584 sys_fstatfs(p, v, retval) 585 struct proc *p; 586 void *v; 587 register_t *retval; 588 { 589 register struct sys_fstatfs_args /* { 590 syscallarg(int) fd; 591 syscallarg(struct statfs *) buf; 592 } */ *uap = v; 593 struct file *fp; 594 struct mount *mp; 595 register struct statfs *sp; 596 int error; 597 598 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 599 return (error); 600 mp = ((struct vnode *)fp->f_data)->v_mount; 601 sp = &mp->mnt_stat; 602 if ((error = VFS_STATFS(mp, sp, p)) != 0) 603 return (error); 604 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 605 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 606 } 607 608 /* 609 * Get statistics on all filesystems. 610 */ 611 int 612 sys_getfsstat(p, v, retval) 613 struct proc *p; 614 void *v; 615 register_t *retval; 616 { 617 register struct sys_getfsstat_args /* { 618 syscallarg(struct statfs *) buf; 619 syscallarg(long) bufsize; 620 syscallarg(int) flags; 621 } */ *uap = v; 622 register struct mount *mp, *nmp; 623 register struct statfs *sp; 624 caddr_t sfsp; 625 long count, maxcount, error; 626 627 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 628 sfsp = (caddr_t)SCARG(uap, buf); 629 for (count = 0, 630 mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 631 nmp = mp->mnt_list.cqe_next; 632 if (sfsp && count < maxcount && 633 ((mp->mnt_flag & MNT_MLOCK) == 0)) { 634 sp = &mp->mnt_stat; 635 /* 636 * If MNT_NOWAIT is specified, do not refresh the 637 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 638 */ 639 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 640 (SCARG(uap, flags) & MNT_WAIT)) && 641 (error = VFS_STATFS(mp, sp, p)) != 0) 642 continue; 643 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 644 error = copyout(sp, sfsp, sizeof(*sp)); 645 if (error) 646 return (error); 647 sfsp += sizeof(*sp); 648 } 649 count++; 650 } 651 if (sfsp && count > maxcount) 652 *retval = maxcount; 653 else 654 *retval = count; 655 return (0); 656 } 657 658 /* 659 * Change current working directory to a given file descriptor. 660 */ 661 /* ARGSUSED */ 662 int 663 sys_fchdir(p, v, retval) 664 struct proc *p; 665 void *v; 666 register_t *retval; 667 { 668 struct sys_fchdir_args /* { 669 syscallarg(int) fd; 670 } */ *uap = v; 671 register struct filedesc *fdp = p->p_fd; 672 struct vnode *vp, *tdp; 673 struct mount *mp; 674 struct file *fp; 675 int error; 676 677 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 678 return (error); 679 vp = (struct vnode *)fp->f_data; 680 VREF(vp); 681 VOP_LOCK(vp); 682 if (vp->v_type != VDIR) 683 error = ENOTDIR; 684 else 685 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 686 while (!error && (mp = vp->v_mountedhere) != NULL) { 687 if (mp->mnt_flag & MNT_MLOCK) { 688 mp->mnt_flag |= MNT_MWAIT; 689 sleep((caddr_t)mp, PVFS); 690 continue; 691 } 692 if ((error = VFS_ROOT(mp, &tdp)) != 0) 693 break; 694 vput(vp); 695 vp = tdp; 696 } 697 VOP_UNLOCK(vp); 698 if (error) { 699 vrele(vp); 700 return (error); 701 } 702 vrele(fdp->fd_cdir); 703 fdp->fd_cdir = vp; 704 return (0); 705 } 706 707 /* 708 * Change current working directory (``.''). 709 */ 710 /* ARGSUSED */ 711 int 712 sys_chdir(p, v, retval) 713 struct proc *p; 714 void *v; 715 register_t *retval; 716 { 717 struct sys_chdir_args /* { 718 syscallarg(const char *) path; 719 } */ *uap = v; 720 register struct filedesc *fdp = p->p_fd; 721 int error; 722 struct nameidata nd; 723 724 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 725 SCARG(uap, path), p); 726 if ((error = change_dir(&nd, p)) != 0) 727 return (error); 728 vrele(fdp->fd_cdir); 729 fdp->fd_cdir = nd.ni_vp; 730 return (0); 731 } 732 733 /* 734 * Change notion of root (``/'') directory. 735 */ 736 /* ARGSUSED */ 737 int 738 sys_chroot(p, v, retval) 739 struct proc *p; 740 void *v; 741 register_t *retval; 742 { 743 struct sys_chroot_args /* { 744 syscallarg(const char *) path; 745 } */ *uap = v; 746 register struct filedesc *fdp = p->p_fd; 747 int error; 748 struct nameidata nd; 749 750 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 751 return (error); 752 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 753 SCARG(uap, path), p); 754 if ((error = change_dir(&nd, p)) != 0) 755 return (error); 756 if (fdp->fd_rdir != NULL) 757 vrele(fdp->fd_rdir); 758 fdp->fd_rdir = nd.ni_vp; 759 return (0); 760 } 761 762 /* 763 * Common routine for chroot and chdir. 764 */ 765 static int 766 change_dir(ndp, p) 767 register struct nameidata *ndp; 768 struct proc *p; 769 { 770 struct vnode *vp; 771 int error; 772 773 if ((error = namei(ndp)) != 0) 774 return (error); 775 vp = ndp->ni_vp; 776 if (vp->v_type != VDIR) 777 error = ENOTDIR; 778 else 779 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 780 VOP_UNLOCK(vp); 781 if (error) 782 vrele(vp); 783 return (error); 784 } 785 786 /* 787 * Check permissions, allocate an open file structure, 788 * and call the device open routine if any. 789 */ 790 int 791 sys_open(p, v, retval) 792 struct proc *p; 793 void *v; 794 register_t *retval; 795 { 796 register struct sys_open_args /* { 797 syscallarg(const char *) path; 798 syscallarg(int) flags; 799 syscallarg(int) mode; 800 } */ *uap = v; 801 register struct filedesc *fdp = p->p_fd; 802 register struct file *fp; 803 register struct vnode *vp; 804 int flags, cmode; 805 struct file *nfp; 806 int type, indx, error; 807 struct flock lf; 808 struct nameidata nd; 809 extern struct fileops vnops; 810 811 flags = FFLAGS(SCARG(uap, flags)); 812 if ((flags & (FREAD | FWRITE)) == 0) 813 return (EINVAL); 814 if ((error = falloc(p, &nfp, &indx)) != 0) 815 return (error); 816 fp = nfp; 817 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 818 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 819 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 820 if ((error = vn_open(&nd, flags, cmode)) != 0) { 821 ffree(fp); 822 if ((error == ENODEV || error == ENXIO) && 823 p->p_dupfd >= 0 && /* XXX from fdopen */ 824 (error = 825 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 826 *retval = indx; 827 return (0); 828 } 829 if (error == ERESTART) 830 error = EINTR; 831 fdp->fd_ofiles[indx] = NULL; 832 return (error); 833 } 834 p->p_dupfd = 0; 835 vp = nd.ni_vp; 836 fp->f_flag = flags & FMASK; 837 fp->f_type = DTYPE_VNODE; 838 fp->f_ops = &vnops; 839 fp->f_data = (caddr_t)vp; 840 if (flags & (O_EXLOCK | O_SHLOCK)) { 841 lf.l_whence = SEEK_SET; 842 lf.l_start = 0; 843 lf.l_len = 0; 844 if (flags & O_EXLOCK) 845 lf.l_type = F_WRLCK; 846 else 847 lf.l_type = F_RDLCK; 848 type = F_FLOCK; 849 if ((flags & FNONBLOCK) == 0) 850 type |= F_WAIT; 851 VOP_UNLOCK(vp); 852 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 853 if (error) { 854 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 855 ffree(fp); 856 fdp->fd_ofiles[indx] = NULL; 857 return (error); 858 } 859 VOP_LOCK(vp); 860 fp->f_flag |= FHASLOCK; 861 } 862 VOP_UNLOCK(vp); 863 *retval = indx; 864 return (0); 865 } 866 867 /* 868 * Create a special file. 869 */ 870 /* ARGSUSED */ 871 int 872 sys_mknod(p, v, retval) 873 struct proc *p; 874 void *v; 875 register_t *retval; 876 { 877 register struct sys_mknod_args /* { 878 syscallarg(const char *) path; 879 syscallarg(int) mode; 880 syscallarg(int) dev; 881 } */ *uap = v; 882 register struct vnode *vp; 883 struct vattr vattr; 884 int error; 885 int whiteout = 0; 886 struct nameidata nd; 887 888 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 889 return (error); 890 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 891 if ((error = namei(&nd)) != 0) 892 return (error); 893 vp = nd.ni_vp; 894 if (vp != NULL) 895 error = EEXIST; 896 else { 897 VATTR_NULL(&vattr); 898 vattr.va_mode = 899 (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 900 vattr.va_rdev = SCARG(uap, dev); 901 whiteout = 0; 902 903 switch (SCARG(uap, mode) & S_IFMT) { 904 case S_IFMT: /* used by badsect to flag bad sectors */ 905 vattr.va_type = VBAD; 906 break; 907 case S_IFCHR: 908 vattr.va_type = VCHR; 909 break; 910 case S_IFBLK: 911 vattr.va_type = VBLK; 912 break; 913 case S_IFWHT: 914 whiteout = 1; 915 break; 916 default: 917 error = EINVAL; 918 break; 919 } 920 } 921 if (!error) { 922 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 923 if (whiteout) { 924 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 925 if (error) 926 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 927 vput(nd.ni_dvp); 928 } else { 929 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 930 &nd.ni_cnd, &vattr); 931 } 932 } else { 933 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 934 if (nd.ni_dvp == vp) 935 vrele(nd.ni_dvp); 936 else 937 vput(nd.ni_dvp); 938 if (vp) 939 vrele(vp); 940 } 941 return (error); 942 } 943 944 /* 945 * Create a named pipe. 946 */ 947 /* ARGSUSED */ 948 int 949 sys_mkfifo(p, v, retval) 950 struct proc *p; 951 void *v; 952 register_t *retval; 953 { 954 #ifndef FIFO 955 return (EOPNOTSUPP); 956 #else 957 register struct sys_mkfifo_args /* { 958 syscallarg(const char *) path; 959 syscallarg(int) mode; 960 } */ *uap = v; 961 struct vattr vattr; 962 int error; 963 struct nameidata nd; 964 965 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 966 if ((error = namei(&nd)) != 0) 967 return (error); 968 if (nd.ni_vp != NULL) { 969 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 970 if (nd.ni_dvp == nd.ni_vp) 971 vrele(nd.ni_dvp); 972 else 973 vput(nd.ni_dvp); 974 vrele(nd.ni_vp); 975 return (EEXIST); 976 } 977 VATTR_NULL(&vattr); 978 vattr.va_type = VFIFO; 979 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 980 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 981 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 982 #endif /* FIFO */ 983 } 984 985 /* 986 * Make a hard file link. 987 */ 988 /* ARGSUSED */ 989 int 990 sys_link(p, v, retval) 991 struct proc *p; 992 void *v; 993 register_t *retval; 994 { 995 register struct sys_link_args /* { 996 syscallarg(const char *) path; 997 syscallarg(const char *) link; 998 } */ *uap = v; 999 register struct vnode *vp; 1000 struct nameidata nd; 1001 int error; 1002 1003 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1004 if ((error = namei(&nd)) != 0) 1005 return (error); 1006 vp = nd.ni_vp; 1007 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1008 if ((error = namei(&nd)) != 0) 1009 goto out; 1010 if (nd.ni_vp) { 1011 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1012 if (nd.ni_dvp == nd.ni_vp) 1013 vrele(nd.ni_dvp); 1014 else 1015 vput(nd.ni_dvp); 1016 vrele(nd.ni_vp); 1017 error = EEXIST; 1018 goto out; 1019 } 1020 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1021 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1022 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1023 out: 1024 vrele(vp); 1025 return (error); 1026 } 1027 1028 /* 1029 * Make a symbolic link. 1030 */ 1031 /* ARGSUSED */ 1032 int 1033 sys_symlink(p, v, retval) 1034 struct proc *p; 1035 void *v; 1036 register_t *retval; 1037 { 1038 register struct sys_symlink_args /* { 1039 syscallarg(const char *) path; 1040 syscallarg(const char *) link; 1041 } */ *uap = v; 1042 struct vattr vattr; 1043 char *path; 1044 int error; 1045 struct nameidata nd; 1046 1047 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1048 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1049 if (error) 1050 goto out; 1051 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1052 if ((error = namei(&nd)) != 0) 1053 goto out; 1054 if (nd.ni_vp) { 1055 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1056 if (nd.ni_dvp == nd.ni_vp) 1057 vrele(nd.ni_dvp); 1058 else 1059 vput(nd.ni_dvp); 1060 vrele(nd.ni_vp); 1061 error = EEXIST; 1062 goto out; 1063 } 1064 VATTR_NULL(&vattr); 1065 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1066 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1067 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1068 out: 1069 FREE(path, M_NAMEI); 1070 return (error); 1071 } 1072 1073 /* 1074 * Delete a whiteout from the filesystem. 1075 */ 1076 /* ARGSUSED */ 1077 int 1078 sys_undelete(p, v, retval) 1079 struct proc *p; 1080 void *v; 1081 register_t *retval; 1082 { 1083 register struct sys_undelete_args /* { 1084 syscallarg(const char *) path; 1085 } */ *uap = v; 1086 int error; 1087 struct nameidata nd; 1088 1089 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1090 SCARG(uap, path), p); 1091 error = namei(&nd); 1092 if (error) 1093 return (error); 1094 1095 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1096 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1097 if (nd.ni_dvp == nd.ni_vp) 1098 vrele(nd.ni_dvp); 1099 else 1100 vput(nd.ni_dvp); 1101 if (nd.ni_vp) 1102 vrele(nd.ni_vp); 1103 return (EEXIST); 1104 } 1105 1106 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1107 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1108 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1109 vput(nd.ni_dvp); 1110 return (error); 1111 } 1112 1113 /* 1114 * Delete a name from the filesystem. 1115 */ 1116 /* ARGSUSED */ 1117 int 1118 sys_unlink(p, v, retval) 1119 struct proc *p; 1120 void *v; 1121 register_t *retval; 1122 { 1123 struct sys_unlink_args /* { 1124 syscallarg(const char *) path; 1125 } */ *uap = v; 1126 register struct vnode *vp; 1127 int error; 1128 struct nameidata nd; 1129 1130 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1131 SCARG(uap, path), p); 1132 if ((error = namei(&nd)) != 0) 1133 return (error); 1134 vp = nd.ni_vp; 1135 1136 /* 1137 * The root of a mounted filesystem cannot be deleted. 1138 */ 1139 if (vp->v_flag & VROOT) { 1140 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1141 if (nd.ni_dvp == vp) 1142 vrele(nd.ni_dvp); 1143 else 1144 vput(nd.ni_dvp); 1145 vput(vp); 1146 error = EBUSY; 1147 goto out; 1148 } 1149 1150 #if defined(UVM) 1151 (void)uvm_vnp_uncache(vp); 1152 #else 1153 (void)vnode_pager_uncache(vp); 1154 #endif 1155 1156 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1157 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1158 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1159 out: 1160 return (error); 1161 } 1162 1163 /* 1164 * Reposition read/write file offset. 1165 */ 1166 int 1167 sys_lseek(p, v, retval) 1168 struct proc *p; 1169 void *v; 1170 register_t *retval; 1171 { 1172 register struct sys_lseek_args /* { 1173 syscallarg(int) fd; 1174 syscallarg(int) pad; 1175 syscallarg(off_t) offset; 1176 syscallarg(int) whence; 1177 } */ *uap = v; 1178 struct ucred *cred = p->p_ucred; 1179 register struct filedesc *fdp = p->p_fd; 1180 register struct file *fp; 1181 struct vnode *vp; 1182 struct vattr vattr; 1183 register off_t newoff; 1184 int error; 1185 1186 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1187 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1188 return (EBADF); 1189 1190 vp = (struct vnode *)fp->f_data; 1191 if (fp->f_type != DTYPE_VNODE 1192 #ifdef FIFO 1193 || vp->v_type == VFIFO 1194 #endif 1195 ) 1196 return (ESPIPE); 1197 1198 switch (SCARG(uap, whence)) { 1199 case SEEK_CUR: 1200 newoff = fp->f_offset + SCARG(uap, offset); 1201 break; 1202 case SEEK_END: 1203 error = VOP_GETATTR(vp, &vattr, cred, p); 1204 if (error) 1205 return (error); 1206 newoff = SCARG(uap, offset) + vattr.va_size; 1207 break; 1208 case SEEK_SET: 1209 newoff = SCARG(uap, offset); 1210 break; 1211 default: 1212 return (EINVAL); 1213 } 1214 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1215 return (error); 1216 1217 *(off_t *)retval = fp->f_offset = newoff; 1218 return (0); 1219 } 1220 1221 /* 1222 * Check access permissions. 1223 */ 1224 int 1225 sys_access(p, v, retval) 1226 struct proc *p; 1227 void *v; 1228 register_t *retval; 1229 { 1230 register struct sys_access_args /* { 1231 syscallarg(const char *) path; 1232 syscallarg(int) flags; 1233 } */ *uap = v; 1234 register struct ucred *cred = p->p_ucred; 1235 register struct vnode *vp; 1236 int error, flags, t_gid, t_uid; 1237 struct nameidata nd; 1238 1239 t_uid = cred->cr_uid; 1240 t_gid = cred->cr_gid; 1241 cred->cr_uid = p->p_cred->p_ruid; 1242 cred->cr_gid = p->p_cred->p_rgid; 1243 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1244 SCARG(uap, path), p); 1245 if ((error = namei(&nd)) != 0) 1246 goto out1; 1247 vp = nd.ni_vp; 1248 1249 /* Flags == 0 means only check for existence. */ 1250 if (SCARG(uap, flags)) { 1251 flags = 0; 1252 if (SCARG(uap, flags) & R_OK) 1253 flags |= VREAD; 1254 if (SCARG(uap, flags) & W_OK) 1255 flags |= VWRITE; 1256 if (SCARG(uap, flags) & X_OK) 1257 flags |= VEXEC; 1258 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1259 error = VOP_ACCESS(vp, flags, cred, p); 1260 } 1261 vput(vp); 1262 out1: 1263 cred->cr_uid = t_uid; 1264 cred->cr_gid = t_gid; 1265 return (error); 1266 } 1267 1268 /* 1269 * Get file status; this version follows links. 1270 */ 1271 /* ARGSUSED */ 1272 int 1273 sys___stat13(p, v, retval) 1274 struct proc *p; 1275 void *v; 1276 register_t *retval; 1277 { 1278 register struct sys___stat13_args /* { 1279 syscallarg(const char *) path; 1280 syscallarg(struct stat *) ub; 1281 } */ *uap = v; 1282 struct stat sb; 1283 int error; 1284 struct nameidata nd; 1285 1286 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1287 SCARG(uap, path), p); 1288 if ((error = namei(&nd)) != 0) 1289 return (error); 1290 error = vn_stat(nd.ni_vp, &sb, p); 1291 vput(nd.ni_vp); 1292 if (error) 1293 return (error); 1294 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1295 return (error); 1296 } 1297 1298 /* 1299 * Get file status; this version does not follow links. 1300 */ 1301 /* ARGSUSED */ 1302 int 1303 sys___lstat13(p, v, retval) 1304 struct proc *p; 1305 void *v; 1306 register_t *retval; 1307 { 1308 register struct sys___lstat13_args /* { 1309 syscallarg(const char *) path; 1310 syscallarg(struct stat *) ub; 1311 } */ *uap = v; 1312 struct stat sb; 1313 int error; 1314 struct nameidata nd; 1315 1316 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1317 SCARG(uap, path), p); 1318 if ((error = namei(&nd)) != 0) 1319 return (error); 1320 error = vn_stat(nd.ni_vp, &sb, p); 1321 vput(nd.ni_vp); 1322 if (error) 1323 return (error); 1324 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1325 return (error); 1326 } 1327 1328 /* 1329 * Get configurable pathname variables. 1330 */ 1331 /* ARGSUSED */ 1332 int 1333 sys_pathconf(p, v, retval) 1334 struct proc *p; 1335 void *v; 1336 register_t *retval; 1337 { 1338 register struct sys_pathconf_args /* { 1339 syscallarg(const char *) path; 1340 syscallarg(int) name; 1341 } */ *uap = v; 1342 int error; 1343 struct nameidata nd; 1344 1345 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1346 SCARG(uap, path), p); 1347 if ((error = namei(&nd)) != 0) 1348 return (error); 1349 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1350 vput(nd.ni_vp); 1351 return (error); 1352 } 1353 1354 /* 1355 * Return target name of a symbolic link. 1356 */ 1357 /* ARGSUSED */ 1358 int 1359 sys_readlink(p, v, retval) 1360 struct proc *p; 1361 void *v; 1362 register_t *retval; 1363 { 1364 register struct sys_readlink_args /* { 1365 syscallarg(const char *) path; 1366 syscallarg(char *) buf; 1367 syscallarg(int) count; 1368 } */ *uap = v; 1369 register struct vnode *vp; 1370 struct iovec aiov; 1371 struct uio auio; 1372 int error; 1373 struct nameidata nd; 1374 1375 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1376 SCARG(uap, path), p); 1377 if ((error = namei(&nd)) != 0) 1378 return (error); 1379 vp = nd.ni_vp; 1380 if (vp->v_type != VLNK) 1381 error = EINVAL; 1382 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1383 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1384 aiov.iov_base = SCARG(uap, buf); 1385 aiov.iov_len = SCARG(uap, count); 1386 auio.uio_iov = &aiov; 1387 auio.uio_iovcnt = 1; 1388 auio.uio_offset = 0; 1389 auio.uio_rw = UIO_READ; 1390 auio.uio_segflg = UIO_USERSPACE; 1391 auio.uio_procp = p; 1392 auio.uio_resid = SCARG(uap, count); 1393 error = VOP_READLINK(vp, &auio, p->p_ucred); 1394 } 1395 vput(vp); 1396 *retval = SCARG(uap, count) - auio.uio_resid; 1397 return (error); 1398 } 1399 1400 /* 1401 * Change flags of a file given a path name. 1402 */ 1403 /* ARGSUSED */ 1404 int 1405 sys_chflags(p, v, retval) 1406 struct proc *p; 1407 void *v; 1408 register_t *retval; 1409 { 1410 register struct sys_chflags_args /* { 1411 syscallarg(const char *) path; 1412 syscallarg(u_long) flags; 1413 } */ *uap = v; 1414 register struct vnode *vp; 1415 struct vattr vattr; 1416 int error; 1417 struct nameidata nd; 1418 1419 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1420 if ((error = namei(&nd)) != 0) 1421 return (error); 1422 vp = nd.ni_vp; 1423 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1424 VOP_LOCK(vp); 1425 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1426 error = EROFS; 1427 else { 1428 VATTR_NULL(&vattr); 1429 vattr.va_flags = SCARG(uap, flags); 1430 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1431 } 1432 vput(vp); 1433 return (error); 1434 } 1435 1436 /* 1437 * Change flags of a file given a file descriptor. 1438 */ 1439 /* ARGSUSED */ 1440 int 1441 sys_fchflags(p, v, retval) 1442 struct proc *p; 1443 void *v; 1444 register_t *retval; 1445 { 1446 register struct sys_fchflags_args /* { 1447 syscallarg(int) fd; 1448 syscallarg(u_long) flags; 1449 } */ *uap = v; 1450 struct vattr vattr; 1451 struct vnode *vp; 1452 struct file *fp; 1453 int error; 1454 1455 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1456 return (error); 1457 vp = (struct vnode *)fp->f_data; 1458 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1459 VOP_LOCK(vp); 1460 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1461 error = EROFS; 1462 else { 1463 VATTR_NULL(&vattr); 1464 vattr.va_flags = SCARG(uap, flags); 1465 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1466 } 1467 VOP_UNLOCK(vp); 1468 return (error); 1469 } 1470 1471 /* 1472 * Change mode of a file given path name; this version follows links. 1473 */ 1474 /* ARGSUSED */ 1475 int 1476 sys_chmod(p, v, retval) 1477 struct proc *p; 1478 void *v; 1479 register_t *retval; 1480 { 1481 register struct sys_chmod_args /* { 1482 syscallarg(const char *) path; 1483 syscallarg(int) mode; 1484 } */ *uap = v; 1485 int error; 1486 struct nameidata nd; 1487 1488 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1489 if ((error = namei(&nd)) != 0) 1490 return (error); 1491 1492 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1493 1494 vrele(nd.ni_vp); 1495 return (error); 1496 } 1497 1498 /* 1499 * Change mode of a file given a file descriptor. 1500 */ 1501 /* ARGSUSED */ 1502 int 1503 sys_fchmod(p, v, retval) 1504 struct proc *p; 1505 void *v; 1506 register_t *retval; 1507 { 1508 register struct sys_fchmod_args /* { 1509 syscallarg(int) fd; 1510 syscallarg(int) mode; 1511 } */ *uap = v; 1512 struct file *fp; 1513 int error; 1514 1515 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1516 return (error); 1517 1518 return (change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p)); 1519 } 1520 1521 /* 1522 * Change mode of a file given path name; this version does not follow links. 1523 */ 1524 /* ARGSUSED */ 1525 int 1526 sys_lchmod(p, v, retval) 1527 struct proc *p; 1528 void *v; 1529 register_t *retval; 1530 { 1531 register struct sys_lchmod_args /* { 1532 syscallarg(const char *) path; 1533 syscallarg(int) mode; 1534 } */ *uap = v; 1535 int error; 1536 struct nameidata nd; 1537 1538 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1539 if ((error = namei(&nd)) != 0) 1540 return (error); 1541 1542 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1543 1544 vrele(nd.ni_vp); 1545 return (error); 1546 } 1547 1548 /* 1549 * Common routine to set mode given a vnode. 1550 */ 1551 static int 1552 change_mode(vp, mode, p) 1553 struct vnode *vp; 1554 int mode; 1555 struct proc *p; 1556 { 1557 struct vattr vattr; 1558 int error; 1559 1560 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1561 VOP_LOCK(vp); 1562 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1563 error = EROFS; 1564 else { 1565 VATTR_NULL(&vattr); 1566 vattr.va_mode = mode & ALLPERMS; 1567 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1568 } 1569 VOP_UNLOCK(vp); 1570 return (error); 1571 } 1572 1573 /* 1574 * Set ownership given a path name; this version follows links. 1575 */ 1576 /* ARGSUSED */ 1577 int 1578 sys_chown(p, v, retval) 1579 struct proc *p; 1580 void *v; 1581 register_t *retval; 1582 { 1583 register struct sys_chown_args /* { 1584 syscallarg(const char *) path; 1585 syscallarg(uid_t) uid; 1586 syscallarg(gid_t) gid; 1587 } */ *uap = v; 1588 int error; 1589 struct nameidata nd; 1590 1591 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1592 if ((error = namei(&nd)) != 0) 1593 return (error); 1594 1595 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p); 1596 1597 vrele(nd.ni_vp); 1598 return (error); 1599 } 1600 1601 /* 1602 * Set ownership given a file descriptor. 1603 */ 1604 /* ARGSUSED */ 1605 int 1606 sys_fchown(p, v, retval) 1607 struct proc *p; 1608 void *v; 1609 register_t *retval; 1610 { 1611 register struct sys_fchown_args /* { 1612 syscallarg(int) fd; 1613 syscallarg(uid_t) uid; 1614 syscallarg(gid_t) gid; 1615 } */ *uap = v; 1616 int error; 1617 struct file *fp; 1618 1619 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1620 return (error); 1621 1622 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1623 SCARG(uap, gid), p)); 1624 } 1625 1626 /* 1627 * Set ownership given a path name; this version does not follow links. 1628 */ 1629 /* ARGSUSED */ 1630 int 1631 sys_lchown(p, v, retval) 1632 struct proc *p; 1633 void *v; 1634 register_t *retval; 1635 { 1636 register struct sys_lchown_args /* { 1637 syscallarg(const char *) path; 1638 syscallarg(uid_t) uid; 1639 syscallarg(gid_t) gid; 1640 } */ *uap = v; 1641 int error; 1642 struct nameidata nd; 1643 1644 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1645 if ((error = namei(&nd)) != 0) 1646 return (error); 1647 1648 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p); 1649 1650 vrele(nd.ni_vp); 1651 return (error); 1652 } 1653 1654 /* 1655 * Common routine to set ownership given a vnode. 1656 */ 1657 static int 1658 change_owner(vp, uid, gid, p) 1659 register struct vnode *vp; 1660 uid_t uid; 1661 gid_t gid; 1662 struct proc *p; 1663 { 1664 struct vattr vattr; 1665 mode_t newmode = VNOVAL; 1666 int error; 1667 1668 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1669 VOP_LOCK(vp); 1670 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 1671 error = EROFS; 1672 goto out; 1673 } 1674 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 1675 goto out; 1676 1677 /* 1678 * Unless the caller is the superuser, clear the (S_ISUID | S_ISGID) 1679 * bits, but alter va_mode only if those are actually set on the vnode. 1680 */ 1681 if ((suser(p->p_ucred, NULL) != 0) && 1682 (vattr.va_mode & (S_ISUID | S_ISGID))) 1683 newmode = vattr.va_mode & ~(S_ISUID | S_ISGID); 1684 1685 VATTR_NULL(&vattr); 1686 vattr.va_uid = uid; 1687 vattr.va_gid = gid; 1688 vattr.va_mode = newmode; 1689 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1690 1691 out: 1692 VOP_UNLOCK(vp); 1693 return (error); 1694 } 1695 1696 /* 1697 * Set the access and modification times given a path name; this 1698 * version follows links. 1699 */ 1700 /* ARGSUSED */ 1701 int 1702 sys_utimes(p, v, retval) 1703 struct proc *p; 1704 void *v; 1705 register_t *retval; 1706 { 1707 register struct sys_utimes_args /* { 1708 syscallarg(const char *) path; 1709 syscallarg(const struct timeval *) tptr; 1710 } */ *uap = v; 1711 int error; 1712 struct nameidata nd; 1713 1714 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1715 if ((error = namei(&nd)) != 0) 1716 return (error); 1717 1718 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1719 1720 vrele(nd.ni_vp); 1721 return (error); 1722 } 1723 1724 /* 1725 * Set the access and modification times given a file descriptor. 1726 */ 1727 /* ARGSUSED */ 1728 int 1729 sys_futimes(p, v, retval) 1730 struct proc *p; 1731 void *v; 1732 register_t *retval; 1733 { 1734 register struct sys_futimes_args /* { 1735 syscallarg(int) fd; 1736 syscallarg(const struct timeval *) tptr; 1737 } */ *uap = v; 1738 int error; 1739 struct file *fp; 1740 1741 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1742 return (error); 1743 1744 return (change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), 1745 p)); 1746 } 1747 1748 /* 1749 * Set the access and modification times given a path name; this 1750 * version does not follow links. 1751 */ 1752 /* ARGSUSED */ 1753 int 1754 sys_lutimes(p, v, retval) 1755 struct proc *p; 1756 void *v; 1757 register_t *retval; 1758 { 1759 register struct sys_lutimes_args /* { 1760 syscallarg(const char *) path; 1761 syscallarg(const struct timeval *) tptr; 1762 } */ *uap = v; 1763 int error; 1764 struct nameidata nd; 1765 1766 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1767 if ((error = namei(&nd)) != 0) 1768 return (error); 1769 1770 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1771 1772 vrele(nd.ni_vp); 1773 return (error); 1774 } 1775 1776 /* 1777 * Common routine to set access and modification times given a vnode. 1778 */ 1779 static int 1780 change_utimes(vp, tptr, p) 1781 struct vnode *vp; 1782 const struct timeval *tptr; 1783 struct proc *p; 1784 { 1785 struct timeval tv[2]; 1786 struct vattr vattr; 1787 int error; 1788 1789 VATTR_NULL(&vattr); 1790 if (tptr == NULL) { 1791 microtime(&tv[0]); 1792 tv[1] = tv[0]; 1793 vattr.va_vaflags |= VA_UTIMES_NULL; 1794 } else { 1795 error = copyin(tptr, tv, sizeof (tv)); 1796 if (error) 1797 return (error); 1798 } 1799 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1800 VOP_LOCK(vp); 1801 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1802 error = EROFS; 1803 else { 1804 vattr.va_atime.tv_sec = tv[0].tv_sec; 1805 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1806 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1807 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1808 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1809 } 1810 VOP_UNLOCK(vp); 1811 return (error); 1812 } 1813 1814 /* 1815 * Truncate a file given its path name. 1816 */ 1817 /* ARGSUSED */ 1818 int 1819 sys_truncate(p, v, retval) 1820 struct proc *p; 1821 void *v; 1822 register_t *retval; 1823 { 1824 register struct sys_truncate_args /* { 1825 syscallarg(const char *) path; 1826 syscallarg(int) pad; 1827 syscallarg(off_t) length; 1828 } */ *uap = v; 1829 register struct vnode *vp; 1830 struct vattr vattr; 1831 int error; 1832 struct nameidata nd; 1833 1834 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1835 if ((error = namei(&nd)) != 0) 1836 return (error); 1837 vp = nd.ni_vp; 1838 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1839 VOP_LOCK(vp); 1840 if (vp->v_type == VDIR) 1841 error = EISDIR; 1842 else if ((error = vn_writechk(vp)) == 0 && 1843 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1844 VATTR_NULL(&vattr); 1845 vattr.va_size = SCARG(uap, length); 1846 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1847 } 1848 vput(vp); 1849 return (error); 1850 } 1851 1852 /* 1853 * Truncate a file given a file descriptor. 1854 */ 1855 /* ARGSUSED */ 1856 int 1857 sys_ftruncate(p, v, retval) 1858 struct proc *p; 1859 void *v; 1860 register_t *retval; 1861 { 1862 register struct sys_ftruncate_args /* { 1863 syscallarg(int) fd; 1864 syscallarg(int) pad; 1865 syscallarg(off_t) length; 1866 } */ *uap = v; 1867 struct vattr vattr; 1868 struct vnode *vp; 1869 struct file *fp; 1870 int error; 1871 1872 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1873 return (error); 1874 if ((fp->f_flag & FWRITE) == 0) 1875 return (EINVAL); 1876 vp = (struct vnode *)fp->f_data; 1877 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1878 VOP_LOCK(vp); 1879 if (vp->v_type == VDIR) 1880 error = EISDIR; 1881 else if ((error = vn_writechk(vp)) == 0) { 1882 VATTR_NULL(&vattr); 1883 vattr.va_size = SCARG(uap, length); 1884 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1885 } 1886 VOP_UNLOCK(vp); 1887 return (error); 1888 } 1889 1890 /* 1891 * Sync an open file. 1892 */ 1893 /* ARGSUSED */ 1894 int 1895 sys_fsync(p, v, retval) 1896 struct proc *p; 1897 void *v; 1898 register_t *retval; 1899 { 1900 struct sys_fsync_args /* { 1901 syscallarg(int) fd; 1902 } */ *uap = v; 1903 register struct vnode *vp; 1904 struct file *fp; 1905 int error; 1906 1907 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1908 return (error); 1909 vp = (struct vnode *)fp->f_data; 1910 VOP_LOCK(vp); 1911 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p); 1912 VOP_UNLOCK(vp); 1913 return (error); 1914 } 1915 1916 /* 1917 * Rename files, (standard) BSD semantics frontend. 1918 */ 1919 /* ARGSUSED */ 1920 int 1921 sys_rename(p, v, retval) 1922 struct proc *p; 1923 void *v; 1924 register_t *retval; 1925 { 1926 register struct sys_rename_args /* { 1927 syscallarg(const char *) from; 1928 syscallarg(const char *) to; 1929 } */ *uap = v; 1930 1931 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 1932 } 1933 1934 /* 1935 * Rename files, POSIX semantics frontend. 1936 */ 1937 /* ARGSUSED */ 1938 int 1939 sys_posix_rename(p, v, retval) 1940 struct proc *p; 1941 void *v; 1942 register_t *retval; 1943 { 1944 register struct sys_posix_rename_args /* { 1945 syscallarg(const char *) from; 1946 syscallarg(const char *) to; 1947 } */ *uap = v; 1948 1949 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 1950 } 1951 1952 /* 1953 * Rename files. Source and destination must either both be directories, 1954 * or both not be directories. If target is a directory, it must be empty. 1955 * If `from' and `to' refer to the same object, the value of the `retain' 1956 * argument is used to determine whether `from' will be 1957 * 1958 * (retain == 0) deleted unless `from' and `to' refer to the same 1959 * object in the file system's name space (BSD). 1960 * (retain == 1) always retained (POSIX). 1961 */ 1962 static int 1963 rename_files(from, to, p, retain) 1964 const char *from, *to; 1965 struct proc *p; 1966 int retain; 1967 { 1968 register struct vnode *tvp, *fvp, *tdvp; 1969 struct nameidata fromnd, tond; 1970 int error; 1971 1972 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 1973 from, p); 1974 if ((error = namei(&fromnd)) != 0) 1975 return (error); 1976 fvp = fromnd.ni_vp; 1977 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 1978 UIO_USERSPACE, to, p); 1979 if ((error = namei(&tond)) != 0) { 1980 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 1981 vrele(fromnd.ni_dvp); 1982 vrele(fvp); 1983 goto out1; 1984 } 1985 tdvp = tond.ni_dvp; 1986 tvp = tond.ni_vp; 1987 1988 if (tvp != NULL) { 1989 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 1990 error = ENOTDIR; 1991 goto out; 1992 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 1993 error = EISDIR; 1994 goto out; 1995 } 1996 } 1997 1998 if (fvp == tdvp) 1999 error = EINVAL; 2000 2001 /* 2002 * Source and destination refer to the same object. 2003 */ 2004 if (fvp == tvp) { 2005 if (retain) 2006 error = -1; 2007 else if (fromnd.ni_dvp == tdvp && 2008 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2009 !bcmp(fromnd.ni_cnd.cn_nameptr, 2010 tond.ni_cnd.cn_nameptr, 2011 fromnd.ni_cnd.cn_namelen)) 2012 error = -1; 2013 } 2014 2015 out: 2016 if (!error) { 2017 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2018 if (fromnd.ni_dvp != tdvp) 2019 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2020 if (tvp) { 2021 #if defined(UVM) 2022 (void)uvm_vnp_uncache(tvp); 2023 #else 2024 (void)vnode_pager_uncache(tvp); 2025 #endif 2026 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2027 } 2028 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2029 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2030 } else { 2031 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2032 if (tdvp == tvp) 2033 vrele(tdvp); 2034 else 2035 vput(tdvp); 2036 if (tvp) 2037 vput(tvp); 2038 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2039 vrele(fromnd.ni_dvp); 2040 vrele(fvp); 2041 } 2042 vrele(tond.ni_startdir); 2043 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2044 out1: 2045 if (fromnd.ni_startdir) 2046 vrele(fromnd.ni_startdir); 2047 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2048 return (error == -1 ? 0 : error); 2049 } 2050 2051 /* 2052 * Make a directory file. 2053 */ 2054 /* ARGSUSED */ 2055 int 2056 sys_mkdir(p, v, retval) 2057 struct proc *p; 2058 void *v; 2059 register_t *retval; 2060 { 2061 register struct sys_mkdir_args /* { 2062 syscallarg(const char *) path; 2063 syscallarg(int) mode; 2064 } */ *uap = v; 2065 register struct vnode *vp; 2066 struct vattr vattr; 2067 int error; 2068 struct nameidata nd; 2069 2070 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2071 if ((error = namei(&nd)) != 0) 2072 return (error); 2073 vp = nd.ni_vp; 2074 if (vp != NULL) { 2075 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2076 if (nd.ni_dvp == vp) 2077 vrele(nd.ni_dvp); 2078 else 2079 vput(nd.ni_dvp); 2080 vrele(vp); 2081 return (EEXIST); 2082 } 2083 VATTR_NULL(&vattr); 2084 vattr.va_type = VDIR; 2085 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 2086 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2087 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2088 if (!error) 2089 vput(nd.ni_vp); 2090 return (error); 2091 } 2092 2093 /* 2094 * Remove a directory file. 2095 */ 2096 /* ARGSUSED */ 2097 int 2098 sys_rmdir(p, v, retval) 2099 struct proc *p; 2100 void *v; 2101 register_t *retval; 2102 { 2103 struct sys_rmdir_args /* { 2104 syscallarg(const char *) path; 2105 } */ *uap = v; 2106 register struct vnode *vp; 2107 int error; 2108 struct nameidata nd; 2109 2110 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2111 SCARG(uap, path), p); 2112 if ((error = namei(&nd)) != 0) 2113 return (error); 2114 vp = nd.ni_vp; 2115 if (vp->v_type != VDIR) { 2116 error = ENOTDIR; 2117 goto out; 2118 } 2119 /* 2120 * No rmdir "." please. 2121 */ 2122 if (nd.ni_dvp == vp) { 2123 error = EINVAL; 2124 goto out; 2125 } 2126 /* 2127 * The root of a mounted filesystem cannot be deleted. 2128 */ 2129 if (vp->v_flag & VROOT) 2130 error = EBUSY; 2131 out: 2132 if (!error) { 2133 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2134 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2135 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2136 } else { 2137 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2138 if (nd.ni_dvp == vp) 2139 vrele(nd.ni_dvp); 2140 else 2141 vput(nd.ni_dvp); 2142 vput(vp); 2143 } 2144 return (error); 2145 } 2146 2147 /* 2148 * Read a block of directory entries in a file system independent format. 2149 */ 2150 int 2151 sys_getdents(p, v, retval) 2152 struct proc *p; 2153 void *v; 2154 register_t *retval; 2155 { 2156 register struct sys_getdents_args /* { 2157 syscallarg(int) fd; 2158 syscallarg(char *) buf; 2159 syscallarg(size_t) count; 2160 } */ *uap = v; 2161 struct file *fp; 2162 int error, done; 2163 2164 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2165 return (error); 2166 if ((fp->f_flag & FREAD) == 0) 2167 return (EBADF); 2168 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2169 SCARG(uap, count), &done, p, 0, 0); 2170 *retval = done; 2171 return (error); 2172 } 2173 2174 /* 2175 * Set the mode mask for creation of filesystem nodes. 2176 */ 2177 int 2178 sys_umask(p, v, retval) 2179 struct proc *p; 2180 void *v; 2181 register_t *retval; 2182 { 2183 struct sys_umask_args /* { 2184 syscallarg(mode_t) newmask; 2185 } */ *uap = v; 2186 register struct filedesc *fdp; 2187 2188 fdp = p->p_fd; 2189 *retval = fdp->fd_cmask; 2190 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2191 return (0); 2192 } 2193 2194 /* 2195 * Void all references to file by ripping underlying filesystem 2196 * away from vnode. 2197 */ 2198 /* ARGSUSED */ 2199 int 2200 sys_revoke(p, v, retval) 2201 struct proc *p; 2202 void *v; 2203 register_t *retval; 2204 { 2205 register struct sys_revoke_args /* { 2206 syscallarg(const char *) path; 2207 } */ *uap = v; 2208 register struct vnode *vp; 2209 struct vattr vattr; 2210 int error; 2211 struct nameidata nd; 2212 2213 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2214 if ((error = namei(&nd)) != 0) 2215 return (error); 2216 vp = nd.ni_vp; 2217 if (vp->v_type != VCHR && vp->v_type != VBLK) { 2218 error = EINVAL; 2219 goto out; 2220 } 2221 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2222 goto out; 2223 if (p->p_ucred->cr_uid != vattr.va_uid && 2224 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2225 goto out; 2226 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2227 vgoneall(vp); 2228 out: 2229 vrele(vp); 2230 return (error); 2231 } 2232 2233 /* 2234 * Convert a user file descriptor to a kernel file entry. 2235 */ 2236 int 2237 getvnode(fdp, fd, fpp) 2238 struct filedesc *fdp; 2239 int fd; 2240 struct file **fpp; 2241 { 2242 struct vnode *vp; 2243 struct file *fp; 2244 2245 if ((u_int)fd >= fdp->fd_nfiles || 2246 (fp = fdp->fd_ofiles[fd]) == NULL) 2247 return (EBADF); 2248 if (fp->f_type != DTYPE_VNODE) 2249 return (EINVAL); 2250 vp = (struct vnode *)fp->f_data; 2251 if (vp->v_type == VBAD) 2252 return (EBADF); 2253 *fpp = fp; 2254 return (0); 2255 } 2256
Indexes created Tue Sep 23 02:09:52 GMT 2025