vfs_extattr.c revision 101160
1/* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94 39 * $FreeBSD: head/sys/kern/vfs_extattr.c 101160 2002-08-01 15:37:12Z rwatson $ 40 */ 41 42/* For 4.3 integer FS ID compatibility */ 43#include "opt_compat.h" 44#include "opt_mac.h" 45 46#include <sys/param.h> 47#include <sys/systm.h> 48#include <sys/bio.h> 49#include <sys/buf.h> 50#include <sys/sysent.h> 51#include <sys/malloc.h> 52#include <sys/mac.h> 53#include <sys/mount.h> 54#include <sys/mutex.h> 55#include <sys/sysproto.h> 56#include <sys/namei.h> 57#include <sys/filedesc.h> 58#include <sys/kernel.h> 59#include <sys/fcntl.h> 60#include <sys/file.h> 61#include <sys/linker.h> 62#include <sys/stat.h> 63#include <sys/sx.h> 64#include <sys/unistd.h> 65#include <sys/vnode.h> 66#include <sys/proc.h> 67#include <sys/dirent.h> 68#include <sys/extattr.h> 69#include <sys/jail.h> 70#include <sys/sysctl.h> 71 72#include <machine/limits.h> 73#include <machine/stdarg.h> 74 75#include <vm/vm.h> 76#include <vm/vm_object.h> 77#include <vm/vm_page.h> 78#include <vm/uma.h> 79 80static int change_dir(struct nameidata *ndp, struct thread *td); 81static int chroot_refuse_vdir_fds(struct filedesc *fdp); 82static int getutimes(const struct timeval *, struct timespec *); 83static int setfown(struct thread *td, struct vnode *, uid_t, gid_t); 84static int setfmode(struct thread *td, struct vnode *, int); 85static int setfflags(struct thread *td, struct vnode *, int); 86static int setutimes(struct thread *td, struct vnode *, 87 const struct timespec *, int, int); 88static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 89 struct thread *td); 90 91int (*union_dircheckp)(struct thread *td, struct vnode **, struct file *); 92int (*softdep_fsync_hook)(struct vnode *); 93 94/* 95 * Sync each mounted filesystem. 96 */ 97#ifndef _SYS_SYSPROTO_H_ 98struct sync_args { 99 int dummy; 100}; 101#endif 102 103#ifdef DEBUG 104static int syncprt = 0; 105SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, ""); 106#endif 107 108/* ARGSUSED */ 109int 110sync(td, uap) 111 struct thread *td; 112 struct sync_args *uap; 113{ 114 struct mount *mp, *nmp; 115 int asyncflag; 116 117 mtx_lock(&mountlist_mtx); 118 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 119 if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, td)) { 120 nmp = TAILQ_NEXT(mp, mnt_list); 121 continue; 122 } 123 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 124 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 125 asyncflag = mp->mnt_flag & MNT_ASYNC; 126 mp->mnt_flag &= ~MNT_ASYNC; 127 vfs_msync(mp, MNT_NOWAIT); 128 VFS_SYNC(mp, MNT_NOWAIT, 129 ((td != NULL) ? td->td_ucred : NOCRED), td); 130 mp->mnt_flag |= asyncflag; 131 vn_finished_write(mp); 132 } 133 mtx_lock(&mountlist_mtx); 134 nmp = TAILQ_NEXT(mp, mnt_list); 135 vfs_unbusy(mp, td); 136 } 137 mtx_unlock(&mountlist_mtx); 138#if 0 139/* 140 * XXX don't call vfs_bufstats() yet because that routine 141 * was not imported in the Lite2 merge. 142 */ 143#ifdef DIAGNOSTIC 144 if (syncprt) 145 vfs_bufstats(); 146#endif /* DIAGNOSTIC */ 147#endif 148 return (0); 149} 150 151/* XXX PRISON: could be per prison flag */ 152static int prison_quotas; 153#if 0 154SYSCTL_INT(_kern_prison, OID_AUTO, quotas, CTLFLAG_RW, &prison_quotas, 0, ""); 155#endif 156 157/* 158 * Change filesystem quotas. 159 */ 160#ifndef _SYS_SYSPROTO_H_ 161struct quotactl_args { 162 char *path; 163 int cmd; 164 int uid; 165 caddr_t arg; 166}; 167#endif 168/* ARGSUSED */ 169int 170quotactl(td, uap) 171 struct thread *td; 172 register struct quotactl_args /* { 173 syscallarg(char *) path; 174 syscallarg(int) cmd; 175 syscallarg(int) uid; 176 syscallarg(caddr_t) arg; 177 } */ *uap; 178{ 179 struct mount *mp; 180 int error; 181 struct nameidata nd; 182 183 if (jailed(td->td_ucred) && !prison_quotas) 184 return (EPERM); 185 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td); 186 if ((error = namei(&nd)) != 0) 187 return (error); 188 NDFREE(&nd, NDF_ONLY_PNBUF); 189 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH); 190 vrele(nd.ni_vp); 191 if (error) 192 return (error); 193 error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 194 SCARG(uap, arg), td); 195 vn_finished_write(mp); 196 return (error); 197} 198 199/* 200 * Get filesystem statistics. 201 */ 202#ifndef _SYS_SYSPROTO_H_ 203struct statfs_args { 204 char *path; 205 struct statfs *buf; 206}; 207#endif 208/* ARGSUSED */ 209int 210statfs(td, uap) 211 struct thread *td; 212 register struct statfs_args /* { 213 syscallarg(char *) path; 214 syscallarg(struct statfs *) buf; 215 } */ *uap; 216{ 217 register struct mount *mp; 218 register struct statfs *sp; 219 int error; 220 struct nameidata nd; 221 struct statfs sb; 222 223 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td); 224 if ((error = namei(&nd)) != 0) 225 return (error); 226 mp = nd.ni_vp->v_mount; 227 sp = &mp->mnt_stat; 228 NDFREE(&nd, NDF_ONLY_PNBUF); 229 vrele(nd.ni_vp); 230#ifdef MAC 231 error = mac_check_mount_stat(td->td_ucred, mp); 232 if (error) 233 return (error); 234#endif 235 error = VFS_STATFS(mp, sp, td); 236 if (error) 237 return (error); 238 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 239 if (suser(td)) { 240 bcopy(sp, &sb, sizeof(sb)); 241 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; 242 sp = &sb; 243 } 244 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 245} 246 247/* 248 * Get filesystem statistics. 249 */ 250#ifndef _SYS_SYSPROTO_H_ 251struct fstatfs_args { 252 int fd; 253 struct statfs *buf; 254}; 255#endif 256/* ARGSUSED */ 257int 258fstatfs(td, uap) 259 struct thread *td; 260 register struct fstatfs_args /* { 261 syscallarg(int) fd; 262 syscallarg(struct statfs *) buf; 263 } */ *uap; 264{ 265 struct file *fp; 266 struct mount *mp; 267 register struct statfs *sp; 268 int error; 269 struct statfs sb; 270 271 if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 272 return (error); 273 mp = ((struct vnode *)fp->f_data)->v_mount; 274 fdrop(fp, td); 275 if (mp == NULL) 276 return (EBADF); 277#ifdef MAC 278 error = mac_check_mount_stat(td->td_ucred, mp); 279 if (error) 280 return (error); 281#endif 282 sp = &mp->mnt_stat; 283 error = VFS_STATFS(mp, sp, td); 284 if (error) 285 return (error); 286 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 287 if (suser(td)) { 288 bcopy(sp, &sb, sizeof(sb)); 289 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; 290 sp = &sb; 291 } 292 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 293} 294 295/* 296 * Get statistics on all filesystems. 297 */ 298#ifndef _SYS_SYSPROTO_H_ 299struct getfsstat_args { 300 struct statfs *buf; 301 long bufsize; 302 int flags; 303}; 304#endif 305int 306getfsstat(td, uap) 307 struct thread *td; 308 register struct getfsstat_args /* { 309 syscallarg(struct statfs *) buf; 310 syscallarg(long) bufsize; 311 syscallarg(int) flags; 312 } */ *uap; 313{ 314 register struct mount *mp, *nmp; 315 register struct statfs *sp; 316 caddr_t sfsp; 317 long count, maxcount, error; 318 319 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 320 sfsp = (caddr_t)SCARG(uap, buf); 321 count = 0; 322 mtx_lock(&mountlist_mtx); 323 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 324#ifdef MAC 325 if (mac_check_mount_stat(td->td_ucred, mp) != 0) { 326 nmp = TAILQ_NEXT(mp, mnt_list); 327 continue; 328 } 329#endif 330 if (vfs_busy(mp, LK_NOWAIT, &mountlist_mtx, td)) { 331 nmp = TAILQ_NEXT(mp, mnt_list); 332 continue; 333 } 334 if (sfsp && count < maxcount) { 335 sp = &mp->mnt_stat; 336 /* 337 * If MNT_NOWAIT or MNT_LAZY is specified, do not 338 * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY 339 * overrides MNT_WAIT. 340 */ 341 if (((SCARG(uap, flags) & (MNT_LAZY|MNT_NOWAIT)) == 0 || 342 (SCARG(uap, flags) & MNT_WAIT)) && 343 (error = VFS_STATFS(mp, sp, td))) { 344 mtx_lock(&mountlist_mtx); 345 nmp = TAILQ_NEXT(mp, mnt_list); 346 vfs_unbusy(mp, td); 347 continue; 348 } 349 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 350 error = copyout(sp, sfsp, sizeof(*sp)); 351 if (error) { 352 vfs_unbusy(mp, td); 353 return (error); 354 } 355 sfsp += sizeof(*sp); 356 } 357 count++; 358 mtx_lock(&mountlist_mtx); 359 nmp = TAILQ_NEXT(mp, mnt_list); 360 vfs_unbusy(mp, td); 361 } 362 mtx_unlock(&mountlist_mtx); 363 if (sfsp && count > maxcount) 364 td->td_retval[0] = maxcount; 365 else 366 td->td_retval[0] = count; 367 return (0); 368} 369 370/* 371 * Change current working directory to a given file descriptor. 372 */ 373#ifndef _SYS_SYSPROTO_H_ 374struct fchdir_args { 375 int fd; 376}; 377#endif 378/* ARGSUSED */ 379int 380fchdir(td, uap) 381 struct thread *td; 382 struct fchdir_args /* { 383 syscallarg(int) fd; 384 } */ *uap; 385{ 386 register struct filedesc *fdp = td->td_proc->p_fd; 387 struct vnode *vp, *tdp, *vpold; 388 struct mount *mp; 389 struct file *fp; 390 int error; 391 392 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 393 return (error); 394 vp = (struct vnode *)fp->f_data; 395 VREF(vp); 396 fdrop(fp, td); 397 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 398 if (vp->v_type != VDIR) 399 error = ENOTDIR; 400#ifdef MAC 401 else if ((error = mac_check_vnode_chdir(td->td_ucred, vp)) != 0) { 402 } 403#endif 404 else 405 error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td); 406 while (!error && (mp = vp->v_mountedhere) != NULL) { 407 if (vfs_busy(mp, 0, 0, td)) 408 continue; 409 error = VFS_ROOT(mp, &tdp); 410 vfs_unbusy(mp, td); 411 if (error) 412 break; 413 vput(vp); 414 vp = tdp; 415 } 416 if (error) { 417 vput(vp); 418 return (error); 419 } 420 VOP_UNLOCK(vp, 0, td); 421 FILEDESC_LOCK(fdp); 422 vpold = fdp->fd_cdir; 423 fdp->fd_cdir = vp; 424 FILEDESC_UNLOCK(fdp); 425 vrele(vpold); 426 return (0); 427} 428 429/* 430 * Change current working directory (``.''). 431 */ 432#ifndef _SYS_SYSPROTO_H_ 433struct chdir_args { 434 char *path; 435}; 436#endif 437/* ARGSUSED */ 438int 439chdir(td, uap) 440 struct thread *td; 441 struct chdir_args /* { 442 syscallarg(char *) path; 443 } */ *uap; 444{ 445 register struct filedesc *fdp = td->td_proc->p_fd; 446 int error; 447 struct nameidata nd; 448 struct vnode *vp; 449 450 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 451 SCARG(uap, path), td); 452 if ((error = change_dir(&nd, td)) != 0) 453 return (error); 454 NDFREE(&nd, NDF_ONLY_PNBUF); 455 FILEDESC_LOCK(fdp); 456 vp = fdp->fd_cdir; 457 fdp->fd_cdir = nd.ni_vp; 458 FILEDESC_UNLOCK(fdp); 459 vrele(vp); 460 return (0); 461} 462 463/* 464 * Helper function for raised chroot(2) security function: Refuse if 465 * any filedescriptors are open directories. 466 */ 467static int 468chroot_refuse_vdir_fds(fdp) 469 struct filedesc *fdp; 470{ 471 struct vnode *vp; 472 struct file *fp; 473 int fd; 474 475 FILEDESC_LOCK_ASSERT(fdp, MA_OWNED); 476 for (fd = 0; fd < fdp->fd_nfiles ; fd++) { 477 fp = fget_locked(fdp, fd); 478 if (fp == NULL) 479 continue; 480 if (fp->f_type == DTYPE_VNODE) { 481 vp = (struct vnode *)fp->f_data; 482 if (vp->v_type == VDIR) 483 return (EPERM); 484 } 485 } 486 return (0); 487} 488 489/* 490 * This sysctl determines if we will allow a process to chroot(2) if it 491 * has a directory open: 492 * 0: disallowed for all processes. 493 * 1: allowed for processes that were not already chroot(2)'ed. 494 * 2: allowed for all processes. 495 */ 496 497static int chroot_allow_open_directories = 1; 498 499SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW, 500 &chroot_allow_open_directories, 0, ""); 501 502/* 503 * Change notion of root (``/'') directory. 504 */ 505#ifndef _SYS_SYSPROTO_H_ 506struct chroot_args { 507 char *path; 508}; 509#endif 510/* ARGSUSED */ 511int 512chroot(td, uap) 513 struct thread *td; 514 struct chroot_args /* { 515 syscallarg(char *) path; 516 } */ *uap; 517{ 518 register struct filedesc *fdp = td->td_proc->p_fd; 519 int error; 520 struct nameidata nd; 521 struct vnode *vp; 522 523 error = suser_cred(td->td_ucred, PRISON_ROOT); 524 if (error) 525 return (error); 526 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 527 SCARG(uap, path), td); 528 mtx_lock(&Giant); 529 if ((error = change_dir(&nd, td)) != 0) 530 goto error; 531#ifdef MAC 532 if ((error = mac_check_vnode_chroot(td->td_ucred, nd.ni_vp))) 533 goto error; 534#endif 535 FILEDESC_LOCK(fdp); 536 if (chroot_allow_open_directories == 0 || 537 (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) { 538 error = chroot_refuse_vdir_fds(fdp); 539 if (error) 540 goto error_unlock; 541 } 542 vp = fdp->fd_rdir; 543 fdp->fd_rdir = nd.ni_vp; 544 if (!fdp->fd_jdir) { 545 fdp->fd_jdir = nd.ni_vp; 546 VREF(fdp->fd_jdir); 547 } 548 FILEDESC_UNLOCK(fdp); 549 NDFREE(&nd, NDF_ONLY_PNBUF); 550 vrele(vp); 551 mtx_unlock(&Giant); 552 return (0); 553error_unlock: 554 FILEDESC_UNLOCK(fdp); 555error: 556 mtx_unlock(&Giant); 557 NDFREE(&nd, 0); 558 return (error); 559} 560 561/* 562 * Common routine for chroot and chdir. 563 */ 564static int 565change_dir(ndp, td) 566 register struct nameidata *ndp; 567 struct thread *td; 568{ 569 struct vnode *vp; 570 int error; 571 572 error = namei(ndp); 573 if (error) 574 return (error); 575 vp = ndp->ni_vp; 576 if (vp->v_type != VDIR) 577 error = ENOTDIR; 578#ifdef MAC 579 else if ((error = mac_check_vnode_chdir(td->td_ucred, vp)) != 0) { 580 } 581#endif 582 else 583 error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td); 584 if (error) 585 vput(vp); 586 else 587 VOP_UNLOCK(vp, 0, td); 588 return (error); 589} 590 591/* 592 * Check permissions, allocate an open file structure, 593 * and call the device open routine if any. 594 */ 595#ifndef _SYS_SYSPROTO_H_ 596struct open_args { 597 char *path; 598 int flags; 599 int mode; 600}; 601#endif 602int 603open(td, uap) 604 struct thread *td; 605 register struct open_args /* { 606 syscallarg(char *) path; 607 syscallarg(int) flags; 608 syscallarg(int) mode; 609 } */ *uap; 610{ 611 struct proc *p = td->td_proc; 612 struct filedesc *fdp = p->p_fd; 613 struct file *fp; 614 struct vnode *vp; 615 struct vattr vat; 616 struct mount *mp; 617 int cmode, flags, oflags; 618 struct file *nfp; 619 int type, indx, error; 620 struct flock lf; 621 struct nameidata nd; 622 623 oflags = SCARG(uap, flags); 624 if ((oflags & O_ACCMODE) == O_ACCMODE) 625 return (EINVAL); 626 flags = FFLAGS(oflags); 627 error = falloc(td, &nfp, &indx); 628 if (error) 629 return (error); 630 fp = nfp; 631 FILEDESC_LOCK(fdp); 632 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 633 FILEDESC_UNLOCK(fdp); 634 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td); 635 td->td_dupfd = -indx - 1; /* XXX check for fdopen */ 636 /* 637 * Bump the ref count to prevent another process from closing 638 * the descriptor while we are blocked in vn_open() 639 */ 640 fhold(fp); 641 error = vn_open(&nd, &flags, cmode); 642 if (error) { 643 /* 644 * release our own reference 645 */ 646 fdrop(fp, td); 647 648 /* 649 * handle special fdopen() case. bleh. dupfdopen() is 650 * responsible for dropping the old contents of ofiles[indx] 651 * if it succeeds. 652 */ 653 if ((error == ENODEV || error == ENXIO) && 654 td->td_dupfd >= 0 && /* XXX from fdopen */ 655 (error = 656 dupfdopen(td, fdp, indx, td->td_dupfd, flags, error)) == 0) { 657 td->td_retval[0] = indx; 658 return (0); 659 } 660 /* 661 * Clean up the descriptor, but only if another thread hadn't 662 * replaced or closed it. 663 */ 664 FILEDESC_LOCK(fdp); 665 if (fdp->fd_ofiles[indx] == fp) { 666 fdp->fd_ofiles[indx] = NULL; 667 FILEDESC_UNLOCK(fdp); 668 fdrop(fp, td); 669 } else 670 FILEDESC_UNLOCK(fdp); 671 672 if (error == ERESTART) 673 error = EINTR; 674 return (error); 675 } 676 td->td_dupfd = 0; 677 NDFREE(&nd, NDF_ONLY_PNBUF); 678 vp = nd.ni_vp; 679 680 /* 681 * There should be 2 references on the file, one from the descriptor 682 * table, and one for us. 683 * 684 * Handle the case where someone closed the file (via its file 685 * descriptor) while we were blocked. The end result should look 686 * like opening the file succeeded but it was immediately closed. 687 */ 688 FILEDESC_LOCK(fdp); 689 FILE_LOCK(fp); 690 if (fp->f_count == 1) { 691 KASSERT(fdp->fd_ofiles[indx] != fp, 692 ("Open file descriptor lost all refs")); 693 FILEDESC_UNLOCK(fdp); 694 FILE_UNLOCK(fp); 695 VOP_UNLOCK(vp, 0, td); 696 vn_close(vp, flags & FMASK, fp->f_cred, td); 697 fdrop(fp, td); 698 td->td_retval[0] = indx; 699 return 0; 700 } 701 702 /* assert that vn_open created a backing object if one is needed */ 703 KASSERT(!vn_canvmio(vp) || VOP_GETVOBJECT(vp, NULL) == 0, 704 ("open: vmio vnode has no backing object after vn_open")); 705 706 fp->f_data = vp; 707 fp->f_flag = flags & FMASK; 708 fp->f_ops = &vnops; 709 fp->f_type = (vp->v_type == VFIFO ? DTYPE_FIFO : DTYPE_VNODE); 710 FILEDESC_UNLOCK(fdp); 711 FILE_UNLOCK(fp); 712 VOP_UNLOCK(vp, 0, td); 713 if (flags & (O_EXLOCK | O_SHLOCK)) { 714 lf.l_whence = SEEK_SET; 715 lf.l_start = 0; 716 lf.l_len = 0; 717 if (flags & O_EXLOCK) 718 lf.l_type = F_WRLCK; 719 else 720 lf.l_type = F_RDLCK; 721 type = F_FLOCK; 722 if ((flags & FNONBLOCK) == 0) 723 type |= F_WAIT; 724 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, 725 type)) != 0) 726 goto bad; 727 fp->f_flag |= FHASLOCK; 728 } 729 if (flags & O_TRUNC) { 730 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 731 goto bad; 732 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 733 VATTR_NULL(&vat); 734 vat.va_size = 0; 735 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 736#ifdef MAC 737 error = mac_check_vnode_op(td->td_ucred, vp, 738 MAC_OP_VNODE_WRITE); 739 if (error == 0) 740#endif 741 error = VOP_SETATTR(vp, &vat, td->td_ucred, td); 742 VOP_UNLOCK(vp, 0, td); 743 vn_finished_write(mp); 744 if (error) 745 goto bad; 746 } 747 /* 748 * Release our private reference, leaving the one associated with 749 * the descriptor table intact. 750 */ 751 fdrop(fp, td); 752 td->td_retval[0] = indx; 753 return (0); 754bad: 755 FILEDESC_LOCK(fdp); 756 if (fdp->fd_ofiles[indx] == fp) { 757 fdp->fd_ofiles[indx] = NULL; 758 FILEDESC_UNLOCK(fdp); 759 fdrop(fp, td); 760 } else 761 FILEDESC_UNLOCK(fdp); 762 return (error); 763} 764 765#ifdef COMPAT_43 766/* 767 * Create a file. 768 */ 769#ifndef _SYS_SYSPROTO_H_ 770struct ocreat_args { 771 char *path; 772 int mode; 773}; 774#endif 775int 776ocreat(td, uap) 777 struct thread *td; 778 register struct ocreat_args /* { 779 syscallarg(char *) path; 780 syscallarg(int) mode; 781 } */ *uap; 782{ 783 struct open_args /* { 784 syscallarg(char *) path; 785 syscallarg(int) flags; 786 syscallarg(int) mode; 787 } */ nuap; 788 789 SCARG(&nuap, path) = SCARG(uap, path); 790 SCARG(&nuap, mode) = SCARG(uap, mode); 791 SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC; 792 return (open(td, &nuap)); 793} 794#endif /* COMPAT_43 */ 795 796/* 797 * Create a special file. 798 */ 799#ifndef _SYS_SYSPROTO_H_ 800struct mknod_args { 801 char *path; 802 int mode; 803 int dev; 804}; 805#endif 806/* ARGSUSED */ 807int 808mknod(td, uap) 809 struct thread *td; 810 register struct mknod_args /* { 811 syscallarg(char *) path; 812 syscallarg(int) mode; 813 syscallarg(int) dev; 814 } */ *uap; 815{ 816 struct vnode *vp; 817 struct mount *mp; 818 struct vattr vattr; 819 int error; 820 int whiteout = 0; 821 struct nameidata nd; 822 823 switch (SCARG(uap, mode) & S_IFMT) { 824 case S_IFCHR: 825 case S_IFBLK: 826 error = suser(td); 827 break; 828 default: 829 error = suser_cred(td->td_ucred, PRISON_ROOT); 830 break; 831 } 832 if (error) 833 return (error); 834restart: 835 bwillwrite(); 836 NDINIT(&nd, CREATE, LOCKPARENT | SAVENAME, UIO_USERSPACE, 837 SCARG(uap, path), td); 838 if ((error = namei(&nd)) != 0) 839 return (error); 840 vp = nd.ni_vp; 841 if (vp != NULL) { 842 vrele(vp); 843 error = EEXIST; 844 } else { 845 VATTR_NULL(&vattr); 846 FILEDESC_LOCK(td->td_proc->p_fd); 847 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ td->td_proc->p_fd->fd_cmask; 848 FILEDESC_UNLOCK(td->td_proc->p_fd); 849 vattr.va_rdev = SCARG(uap, dev); 850 whiteout = 0; 851 852 switch (SCARG(uap, mode) & S_IFMT) { 853 case S_IFMT: /* used by badsect to flag bad sectors */ 854 vattr.va_type = VBAD; 855 break; 856 case S_IFCHR: 857 vattr.va_type = VCHR; 858 break; 859 case S_IFBLK: 860 vattr.va_type = VBLK; 861 break; 862 case S_IFWHT: 863 whiteout = 1; 864 break; 865 default: 866 error = EINVAL; 867 break; 868 } 869 } 870 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 871 NDFREE(&nd, NDF_ONLY_PNBUF); 872 vput(nd.ni_dvp); 873 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 874 return (error); 875 goto restart; 876 } 877 if (!error) { 878 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 879 if (whiteout) 880 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 881 else { 882 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 883 &nd.ni_cnd, &vattr); 884 if (error == 0) 885 vput(nd.ni_vp); 886 } 887 } 888 NDFREE(&nd, NDF_ONLY_PNBUF); 889 vput(nd.ni_dvp); 890 vn_finished_write(mp); 891 ASSERT_VOP_UNLOCKED(nd.ni_dvp, "mknod"); 892 ASSERT_VOP_UNLOCKED(nd.ni_vp, "mknod"); 893 return (error); 894} 895 896/* 897 * Create a named pipe. 898 */ 899#ifndef _SYS_SYSPROTO_H_ 900struct mkfifo_args { 901 char *path; 902 int mode; 903}; 904#endif 905/* ARGSUSED */ 906int 907mkfifo(td, uap) 908 struct thread *td; 909 register struct mkfifo_args /* { 910 syscallarg(char *) path; 911 syscallarg(int) mode; 912 } */ *uap; 913{ 914 struct mount *mp; 915 struct vattr vattr; 916 int error; 917 struct nameidata nd; 918 919restart: 920 bwillwrite(); 921 NDINIT(&nd, CREATE, LOCKPARENT | SAVENAME, UIO_USERSPACE, 922 SCARG(uap, path), td); 923 if ((error = namei(&nd)) != 0) 924 return (error); 925 if (nd.ni_vp != NULL) { 926 NDFREE(&nd, NDF_ONLY_PNBUF); 927 vrele(nd.ni_vp); 928 vput(nd.ni_dvp); 929 return (EEXIST); 930 } 931 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 932 NDFREE(&nd, NDF_ONLY_PNBUF); 933 vput(nd.ni_dvp); 934 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 935 return (error); 936 goto restart; 937 } 938 VATTR_NULL(&vattr); 939 vattr.va_type = VFIFO; 940 FILEDESC_LOCK(td->td_proc->p_fd); 941 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ td->td_proc->p_fd->fd_cmask; 942 FILEDESC_UNLOCK(td->td_proc->p_fd); 943 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 944 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 945 if (error == 0) 946 vput(nd.ni_vp); 947 NDFREE(&nd, NDF_ONLY_PNBUF); 948 vput(nd.ni_dvp); 949 vn_finished_write(mp); 950 return (error); 951} 952 953/* 954 * Make a hard file link. 955 */ 956#ifndef _SYS_SYSPROTO_H_ 957struct link_args { 958 char *path; 959 char *link; 960}; 961#endif 962/* ARGSUSED */ 963int 964link(td, uap) 965 struct thread *td; 966 register struct link_args /* { 967 syscallarg(char *) path; 968 syscallarg(char *) link; 969 } */ *uap; 970{ 971 struct vnode *vp; 972 struct mount *mp; 973 struct nameidata nd; 974 int error; 975 976 bwillwrite(); 977 NDINIT(&nd, LOOKUP, FOLLOW|NOOBJ, UIO_USERSPACE, SCARG(uap, path), td); 978 if ((error = namei(&nd)) != 0) 979 return (error); 980 NDFREE(&nd, NDF_ONLY_PNBUF); 981 vp = nd.ni_vp; 982 if (vp->v_type == VDIR) { 983 vrele(vp); 984 return (EPERM); /* POSIX */ 985 } 986 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 987 vrele(vp); 988 return (error); 989 } 990 NDINIT(&nd, CREATE, LOCKPARENT | NOOBJ | SAVENAME, UIO_USERSPACE, 991 SCARG(uap, link), td); 992 if ((error = namei(&nd)) == 0) { 993 if (nd.ni_vp != NULL) { 994 vrele(nd.ni_vp); 995 error = EEXIST; 996 } else { 997 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 998 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 999 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1000 } 1001 NDFREE(&nd, NDF_ONLY_PNBUF); 1002 vput(nd.ni_dvp); 1003 } 1004 vrele(vp); 1005 vn_finished_write(mp); 1006 ASSERT_VOP_UNLOCKED(nd.ni_dvp, "link"); 1007 ASSERT_VOP_UNLOCKED(nd.ni_vp, "link"); 1008 return (error); 1009} 1010 1011/* 1012 * Make a symbolic link. 1013 */ 1014#ifndef _SYS_SYSPROTO_H_ 1015struct symlink_args { 1016 char *path; 1017 char *link; 1018}; 1019#endif 1020/* ARGSUSED */ 1021int 1022symlink(td, uap) 1023 struct thread *td; 1024 register struct symlink_args /* { 1025 syscallarg(char *) path; 1026 syscallarg(char *) link; 1027 } */ *uap; 1028{ 1029 struct mount *mp; 1030 struct vattr vattr; 1031 char *path; 1032 int error; 1033 struct nameidata nd; 1034 1035 path = uma_zalloc(namei_zone, M_WAITOK); 1036 if ((error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL)) != 0) 1037 goto out; 1038restart: 1039 bwillwrite(); 1040 NDINIT(&nd, CREATE, LOCKPARENT | NOOBJ | SAVENAME, UIO_USERSPACE, 1041 SCARG(uap, link), td); 1042 if ((error = namei(&nd)) != 0) 1043 goto out; 1044 if (nd.ni_vp) { 1045 NDFREE(&nd, NDF_ONLY_PNBUF); 1046 vrele(nd.ni_vp); 1047 vput(nd.ni_dvp); 1048 error = EEXIST; 1049 goto out; 1050 } 1051 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1052 NDFREE(&nd, NDF_ONLY_PNBUF); 1053 vput(nd.ni_dvp); 1054 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1055 return (error); 1056 goto restart; 1057 } 1058 VATTR_NULL(&vattr); 1059 FILEDESC_LOCK(td->td_proc->p_fd); 1060 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask; 1061 FILEDESC_UNLOCK(td->td_proc->p_fd); 1062 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 1063 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1064 NDFREE(&nd, NDF_ONLY_PNBUF); 1065 if (error == 0) 1066 vput(nd.ni_vp); 1067 vput(nd.ni_dvp); 1068 vn_finished_write(mp); 1069 ASSERT_VOP_UNLOCKED(nd.ni_dvp, "symlink"); 1070 ASSERT_VOP_UNLOCKED(nd.ni_vp, "symlink"); 1071out: 1072 uma_zfree(namei_zone, path); 1073 return (error); 1074} 1075 1076/* 1077 * Delete a whiteout from the filesystem. 1078 */ 1079/* ARGSUSED */ 1080int 1081undelete(td, uap) 1082 struct thread *td; 1083 register struct undelete_args /* { 1084 syscallarg(char *) path; 1085 } */ *uap; 1086{ 1087 int error; 1088 struct mount *mp; 1089 struct nameidata nd; 1090 1091restart: 1092 bwillwrite(); 1093 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1094 SCARG(uap, path), td); 1095 error = namei(&nd); 1096 if (error) 1097 return (error); 1098 1099 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1100 NDFREE(&nd, NDF_ONLY_PNBUF); 1101 if (nd.ni_vp) 1102 vrele(nd.ni_vp); 1103 vput(nd.ni_dvp); 1104 return (EEXIST); 1105 } 1106 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1107 NDFREE(&nd, NDF_ONLY_PNBUF); 1108 vput(nd.ni_dvp); 1109 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1110 return (error); 1111 goto restart; 1112 } 1113 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 1114 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1115 NDFREE(&nd, NDF_ONLY_PNBUF); 1116 vput(nd.ni_dvp); 1117 vn_finished_write(mp); 1118 ASSERT_VOP_UNLOCKED(nd.ni_dvp, "undelete"); 1119 ASSERT_VOP_UNLOCKED(nd.ni_vp, "undelete"); 1120 return (error); 1121} 1122 1123/* 1124 * Delete a name from the filesystem. 1125 */ 1126#ifndef _SYS_SYSPROTO_H_ 1127struct unlink_args { 1128 char *path; 1129}; 1130#endif 1131/* ARGSUSED */ 1132int 1133unlink(td, uap) 1134 struct thread *td; 1135 struct unlink_args /* { 1136 syscallarg(char *) path; 1137 } */ *uap; 1138{ 1139 struct mount *mp; 1140 struct vnode *vp; 1141 int error; 1142 struct nameidata nd; 1143 1144restart: 1145 bwillwrite(); 1146 NDINIT(&nd, DELETE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), td); 1147 if ((error = namei(&nd)) != 0) 1148 return (error); 1149 vp = nd.ni_vp; 1150 if (vp->v_type == VDIR) 1151 error = EPERM; /* POSIX */ 1152 else { 1153 /* 1154 * The root of a mounted filesystem cannot be deleted. 1155 * 1156 * XXX: can this only be a VDIR case? 1157 */ 1158 if (vp->v_flag & VROOT) 1159 error = EBUSY; 1160 } 1161 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1162 NDFREE(&nd, NDF_ONLY_PNBUF); 1163 vrele(vp); 1164 vput(nd.ni_dvp); 1165 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1166 return (error); 1167 goto restart; 1168 } 1169 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 1170 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 1171 if (!error) { 1172 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 1173 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1174 } 1175 NDFREE(&nd, NDF_ONLY_PNBUF); 1176 vput(nd.ni_dvp); 1177 vput(vp); 1178 vn_finished_write(mp); 1179 ASSERT_VOP_UNLOCKED(nd.ni_dvp, "unlink"); 1180 ASSERT_VOP_UNLOCKED(nd.ni_vp, "unlink"); 1181 return (error); 1182} 1183 1184/* 1185 * Reposition read/write file offset. 1186 */ 1187#ifndef _SYS_SYSPROTO_H_ 1188struct lseek_args { 1189 int fd; 1190 int pad; 1191 off_t offset; 1192 int whence; 1193}; 1194#endif 1195int 1196lseek(td, uap) 1197 struct thread *td; 1198 register struct lseek_args /* { 1199 syscallarg(int) fd; 1200 syscallarg(int) pad; 1201 syscallarg(off_t) offset; 1202 syscallarg(int) whence; 1203 } */ *uap; 1204{ 1205 struct ucred *cred = td->td_ucred; 1206 struct file *fp; 1207 struct vnode *vp; 1208 struct vattr vattr; 1209 off_t offset; 1210 int error, noneg; 1211 1212 if ((error = fget(td, uap->fd, &fp)) != 0) 1213 return (error); 1214 if (fp->f_type != DTYPE_VNODE) { 1215 fdrop(fp, td); 1216 return (ESPIPE); 1217 } 1218 vp = (struct vnode *)fp->f_data; 1219 noneg = (vp->v_type != VCHR); 1220 offset = SCARG(uap, offset); 1221 switch (SCARG(uap, whence)) { 1222 case L_INCR: 1223 if (noneg && 1224 (fp->f_offset < 0 || 1225 (offset > 0 && fp->f_offset > OFF_MAX - offset))) 1226 return (EOVERFLOW); 1227 offset += fp->f_offset; 1228 break; 1229 case L_XTND: 1230 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 1231 error = VOP_GETATTR(vp, &vattr, cred, td); 1232 VOP_UNLOCK(vp, 0, td); 1233 if (error) 1234 return (error); 1235 if (noneg && 1236 (vattr.va_size > OFF_MAX || 1237 (offset > 0 && vattr.va_size > OFF_MAX - offset))) 1238 return (EOVERFLOW); 1239 offset += vattr.va_size; 1240 break; 1241 case L_SET: 1242 break; 1243 default: 1244 fdrop(fp, td); 1245 return (EINVAL); 1246 } 1247 if (noneg && offset < 0) 1248 return (EINVAL); 1249 fp->f_offset = offset; 1250 *(off_t *)(td->td_retval) = fp->f_offset; 1251 fdrop(fp, td); 1252 return (0); 1253} 1254 1255#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1256/* 1257 * Reposition read/write file offset. 1258 */ 1259#ifndef _SYS_SYSPROTO_H_ 1260struct olseek_args { 1261 int fd; 1262 long offset; 1263 int whence; 1264}; 1265#endif 1266int 1267olseek(td, uap) 1268 struct thread *td; 1269 register struct olseek_args /* { 1270 syscallarg(int) fd; 1271 syscallarg(long) offset; 1272 syscallarg(int) whence; 1273 } */ *uap; 1274{ 1275 struct lseek_args /* { 1276 syscallarg(int) fd; 1277 syscallarg(int) pad; 1278 syscallarg(off_t) offset; 1279 syscallarg(int) whence; 1280 } */ nuap; 1281 int error; 1282 1283 SCARG(&nuap, fd) = SCARG(uap, fd); 1284 SCARG(&nuap, offset) = SCARG(uap, offset); 1285 SCARG(&nuap, whence) = SCARG(uap, whence); 1286 error = lseek(td, &nuap); 1287 return (error); 1288} 1289#endif /* COMPAT_43 */ 1290 1291/* 1292 * Check access permissions using passed credentials. 1293 */ 1294static int 1295vn_access(vp, user_flags, cred, td) 1296 struct vnode *vp; 1297 int user_flags; 1298 struct ucred *cred; 1299 struct thread *td; 1300{ 1301 int error, flags; 1302 1303 /* Flags == 0 means only check for existence. */ 1304 error = 0; 1305 if (user_flags) { 1306 flags = 0; 1307 if (user_flags & R_OK) 1308 flags |= VREAD; 1309 if (user_flags & W_OK) 1310 flags |= VWRITE; 1311 if (user_flags & X_OK) 1312 flags |= VEXEC; 1313#ifdef MAC 1314 error = mac_check_vnode_access(cred, vp, flags); 1315 if (error) 1316 return (error); 1317#endif 1318 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1319 error = VOP_ACCESS(vp, flags, cred, td); 1320 } 1321 return (error); 1322} 1323 1324/* 1325 * Check access permissions using "real" credentials. 1326 */ 1327#ifndef _SYS_SYSPROTO_H_ 1328struct access_args { 1329 char *path; 1330 int flags; 1331}; 1332#endif 1333int 1334access(td, uap) 1335 struct thread *td; 1336 register struct access_args /* { 1337 syscallarg(char *) path; 1338 syscallarg(int) flags; 1339 } */ *uap; 1340{ 1341 struct ucred *cred, *tmpcred; 1342 register struct vnode *vp; 1343 int error; 1344 struct nameidata nd; 1345 1346 /* 1347 * Create and modify a temporary credential instead of one that 1348 * is potentially shared. This could also mess up socket 1349 * buffer accounting which can run in an interrupt context. 1350 * 1351 * XXX - Depending on how "threads" are finally implemented, it 1352 * may be better to explicitly pass the credential to namei() 1353 * rather than to modify the potentially shared process structure. 1354 */ 1355 cred = td->td_ucred; 1356 tmpcred = crdup(cred); 1357 tmpcred->cr_uid = cred->cr_ruid; 1358 tmpcred->cr_groups[0] = cred->cr_rgid; 1359 td->td_ucred = tmpcred; 1360 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 1361 SCARG(uap, path), td); 1362 if ((error = namei(&nd)) != 0) 1363 goto out1; 1364 vp = nd.ni_vp; 1365 1366 error = vn_access(vp, SCARG(uap, flags), tmpcred, td); 1367 NDFREE(&nd, NDF_ONLY_PNBUF); 1368 vput(vp); 1369out1: 1370 td->td_ucred = cred; 1371 crfree(tmpcred); 1372 return (error); 1373} 1374 1375/* 1376 * Check access permissions using "effective" credentials. 1377 */ 1378#ifndef _SYS_SYSPROTO_H_ 1379struct eaccess_args { 1380 char *path; 1381 int flags; 1382}; 1383#endif 1384int 1385eaccess(td, uap) 1386 struct thread *td; 1387 register struct eaccess_args /* { 1388 syscallarg(char *) path; 1389 syscallarg(int) flags; 1390 } */ *uap; 1391{ 1392 struct nameidata nd; 1393 struct vnode *vp; 1394 int error; 1395 1396 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 1397 SCARG(uap, path), td); 1398 if ((error = namei(&nd)) != 0) 1399 return (error); 1400 vp = nd.ni_vp; 1401 1402 error = vn_access(vp, SCARG(uap, flags), td->td_ucred, td); 1403 NDFREE(&nd, NDF_ONLY_PNBUF); 1404 vput(vp); 1405 return (error); 1406} 1407 1408#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1409/* 1410 * Get file status; this version follows links. 1411 */ 1412#ifndef _SYS_SYSPROTO_H_ 1413struct ostat_args { 1414 char *path; 1415 struct ostat *ub; 1416}; 1417#endif 1418/* ARGSUSED */ 1419int 1420ostat(td, uap) 1421 struct thread *td; 1422 register struct ostat_args /* { 1423 syscallarg(char *) path; 1424 syscallarg(struct ostat *) ub; 1425 } */ *uap; 1426{ 1427 struct stat sb; 1428 struct ostat osb; 1429 int error; 1430 struct nameidata nd; 1431 1432 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 1433 SCARG(uap, path), td); 1434 if ((error = namei(&nd)) != 0) 1435 return (error); 1436 NDFREE(&nd, NDF_ONLY_PNBUF); 1437 error = vn_stat(nd.ni_vp, &sb, td); 1438 vput(nd.ni_vp); 1439 if (error) 1440 return (error); 1441 cvtstat(&sb, &osb); 1442 error = copyout(&osb, SCARG(uap, ub), sizeof (osb)); 1443 return (error); 1444} 1445 1446/* 1447 * Get file status; this version does not follow links. 1448 */ 1449#ifndef _SYS_SYSPROTO_H_ 1450struct olstat_args { 1451 char *path; 1452 struct ostat *ub; 1453}; 1454#endif 1455/* ARGSUSED */ 1456int 1457olstat(td, uap) 1458 struct thread *td; 1459 register struct olstat_args /* { 1460 syscallarg(char *) path; 1461 syscallarg(struct ostat *) ub; 1462 } */ *uap; 1463{ 1464 struct vnode *vp; 1465 struct stat sb; 1466 struct ostat osb; 1467 int error; 1468 struct nameidata nd; 1469 1470 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 1471 SCARG(uap, path), td); 1472 if ((error = namei(&nd)) != 0) 1473 return (error); 1474 vp = nd.ni_vp; 1475 error = vn_stat(vp, &sb, td); 1476 NDFREE(&nd, NDF_ONLY_PNBUF); 1477 vput(vp); 1478 if (error) 1479 return (error); 1480 cvtstat(&sb, &osb); 1481 error = copyout(&osb, SCARG(uap, ub), sizeof (osb)); 1482 return (error); 1483} 1484 1485/* 1486 * Convert from an old to a new stat structure. 1487 */ 1488void 1489cvtstat(st, ost) 1490 struct stat *st; 1491 struct ostat *ost; 1492{ 1493 1494 ost->st_dev = st->st_dev; 1495 ost->st_ino = st->st_ino; 1496 ost->st_mode = st->st_mode; 1497 ost->st_nlink = st->st_nlink; 1498 ost->st_uid = st->st_uid; 1499 ost->st_gid = st->st_gid; 1500 ost->st_rdev = st->st_rdev; 1501 if (st->st_size < (quad_t)1 << 32) 1502 ost->st_size = st->st_size; 1503 else 1504 ost->st_size = -2; 1505 ost->st_atime = st->st_atime; 1506 ost->st_mtime = st->st_mtime; 1507 ost->st_ctime = st->st_ctime; 1508 ost->st_blksize = st->st_blksize; 1509 ost->st_blocks = st->st_blocks; 1510 ost->st_flags = st->st_flags; 1511 ost->st_gen = st->st_gen; 1512} 1513#endif /* COMPAT_43 || COMPAT_SUNOS */ 1514 1515/* 1516 * Get file status; this version follows links. 1517 */ 1518#ifndef _SYS_SYSPROTO_H_ 1519struct stat_args { 1520 char *path; 1521 struct stat *ub; 1522}; 1523#endif 1524/* ARGSUSED */ 1525int 1526stat(td, uap) 1527 struct thread *td; 1528 register struct stat_args /* { 1529 syscallarg(char *) path; 1530 syscallarg(struct stat *) ub; 1531 } */ *uap; 1532{ 1533 struct stat sb; 1534 int error; 1535 struct nameidata nd; 1536 1537#ifdef LOOKUP_SHARED 1538 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | NOOBJ, 1539 UIO_USERSPACE, SCARG(uap, path), td); 1540#else 1541 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 1542 SCARG(uap, path), td); 1543#endif 1544 if ((error = namei(&nd)) != 0) 1545 return (error); 1546 error = vn_stat(nd.ni_vp, &sb, td); 1547 NDFREE(&nd, NDF_ONLY_PNBUF); 1548 vput(nd.ni_vp); 1549 if (error) 1550 return (error); 1551 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1552 return (error); 1553} 1554 1555/* 1556 * Get file status; this version does not follow links. 1557 */ 1558#ifndef _SYS_SYSPROTO_H_ 1559struct lstat_args { 1560 char *path; 1561 struct stat *ub; 1562}; 1563#endif 1564/* ARGSUSED */ 1565int 1566lstat(td, uap) 1567 struct thread *td; 1568 register struct lstat_args /* { 1569 syscallarg(char *) path; 1570 syscallarg(struct stat *) ub; 1571 } */ *uap; 1572{ 1573 int error; 1574 struct vnode *vp; 1575 struct stat sb; 1576 struct nameidata nd; 1577 1578 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 1579 SCARG(uap, path), td); 1580 if ((error = namei(&nd)) != 0) 1581 return (error); 1582 vp = nd.ni_vp; 1583 error = vn_stat(vp, &sb, td); 1584 NDFREE(&nd, NDF_ONLY_PNBUF); 1585 vput(vp); 1586 if (error) 1587 return (error); 1588 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1589 return (error); 1590} 1591 1592/* 1593 * Implementation of the NetBSD stat() function. 1594 * XXX This should probably be collapsed with the FreeBSD version, 1595 * as the differences are only due to vn_stat() clearing spares at 1596 * the end of the structures. vn_stat could be split to avoid this, 1597 * and thus collapse the following to close to zero code. 1598 */ 1599void 1600cvtnstat(sb, nsb) 1601 struct stat *sb; 1602 struct nstat *nsb; 1603{ 1604 bzero(nsb, sizeof *nsb); 1605 nsb->st_dev = sb->st_dev; 1606 nsb->st_ino = sb->st_ino; 1607 nsb->st_mode = sb->st_mode; 1608 nsb->st_nlink = sb->st_nlink; 1609 nsb->st_uid = sb->st_uid; 1610 nsb->st_gid = sb->st_gid; 1611 nsb->st_rdev = sb->st_rdev; 1612 nsb->st_atimespec = sb->st_atimespec; 1613 nsb->st_mtimespec = sb->st_mtimespec; 1614 nsb->st_ctimespec = sb->st_ctimespec; 1615 nsb->st_size = sb->st_size; 1616 nsb->st_blocks = sb->st_blocks; 1617 nsb->st_blksize = sb->st_blksize; 1618 nsb->st_flags = sb->st_flags; 1619 nsb->st_gen = sb->st_gen; 1620 nsb->st_birthtimespec = sb->st_birthtimespec; 1621} 1622 1623#ifndef _SYS_SYSPROTO_H_ 1624struct nstat_args { 1625 char *path; 1626 struct nstat *ub; 1627}; 1628#endif 1629/* ARGSUSED */ 1630int 1631nstat(td, uap) 1632 struct thread *td; 1633 register struct nstat_args /* { 1634 syscallarg(char *) path; 1635 syscallarg(struct nstat *) ub; 1636 } */ *uap; 1637{ 1638 struct stat sb; 1639 struct nstat nsb; 1640 int error; 1641 struct nameidata nd; 1642 1643 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 1644 SCARG(uap, path), td); 1645 if ((error = namei(&nd)) != 0) 1646 return (error); 1647 NDFREE(&nd, NDF_ONLY_PNBUF); 1648 error = vn_stat(nd.ni_vp, &sb, td); 1649 vput(nd.ni_vp); 1650 if (error) 1651 return (error); 1652 cvtnstat(&sb, &nsb); 1653 error = copyout(&nsb, SCARG(uap, ub), sizeof (nsb)); 1654 return (error); 1655} 1656 1657/* 1658 * NetBSD lstat. Get file status; this version does not follow links. 1659 */ 1660#ifndef _SYS_SYSPROTO_H_ 1661struct lstat_args { 1662 char *path; 1663 struct stat *ub; 1664}; 1665#endif 1666/* ARGSUSED */ 1667int 1668nlstat(td, uap) 1669 struct thread *td; 1670 register struct nlstat_args /* { 1671 syscallarg(char *) path; 1672 syscallarg(struct nstat *) ub; 1673 } */ *uap; 1674{ 1675 int error; 1676 struct vnode *vp; 1677 struct stat sb; 1678 struct nstat nsb; 1679 struct nameidata nd; 1680 1681 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 1682 SCARG(uap, path), td); 1683 if ((error = namei(&nd)) != 0) 1684 return (error); 1685 vp = nd.ni_vp; 1686 NDFREE(&nd, NDF_ONLY_PNBUF); 1687 error = vn_stat(vp, &sb, td); 1688 vput(vp); 1689 if (error) 1690 return (error); 1691 cvtnstat(&sb, &nsb); 1692 error = copyout(&nsb, SCARG(uap, ub), sizeof (nsb)); 1693 return (error); 1694} 1695 1696/* 1697 * Get configurable pathname variables. 1698 */ 1699#ifndef _SYS_SYSPROTO_H_ 1700struct pathconf_args { 1701 char *path; 1702 int name; 1703}; 1704#endif 1705/* ARGSUSED */ 1706int 1707pathconf(td, uap) 1708 struct thread *td; 1709 register struct pathconf_args /* { 1710 syscallarg(char *) path; 1711 syscallarg(int) name; 1712 } */ *uap; 1713{ 1714 int error; 1715 struct nameidata nd; 1716 1717 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 1718 SCARG(uap, path), td); 1719 if ((error = namei(&nd)) != 0) 1720 return (error); 1721 NDFREE(&nd, NDF_ONLY_PNBUF); 1722 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), td->td_retval); 1723 vput(nd.ni_vp); 1724 return (error); 1725} 1726 1727/* 1728 * Return target name of a symbolic link. 1729 */ 1730#ifndef _SYS_SYSPROTO_H_ 1731struct readlink_args { 1732 char *path; 1733 char *buf; 1734 int count; 1735}; 1736#endif 1737/* ARGSUSED */ 1738int 1739readlink(td, uap) 1740 struct thread *td; 1741 register struct readlink_args /* { 1742 syscallarg(char *) path; 1743 syscallarg(char *) buf; 1744 syscallarg(int) count; 1745 } */ *uap; 1746{ 1747 register struct vnode *vp; 1748 struct iovec aiov; 1749 struct uio auio; 1750 int error; 1751 struct nameidata nd; 1752 1753 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, 1754 SCARG(uap, path), td); 1755 if ((error = namei(&nd)) != 0) 1756 return (error); 1757 NDFREE(&nd, NDF_ONLY_PNBUF); 1758 vp = nd.ni_vp; 1759#ifdef MAC 1760 error = mac_check_vnode_readlink(td->td_ucred, vp); 1761 if (error) { 1762 vput(vp); 1763 return (error); 1764 } 1765#endif 1766 if (vp->v_type != VLNK) 1767 error = EINVAL; 1768 else { 1769 aiov.iov_base = SCARG(uap, buf); 1770 aiov.iov_len = SCARG(uap, count); 1771 auio.uio_iov = &aiov; 1772 auio.uio_iovcnt = 1; 1773 auio.uio_offset = 0; 1774 auio.uio_rw = UIO_READ; 1775 auio.uio_segflg = UIO_USERSPACE; 1776 auio.uio_td = td; 1777 auio.uio_resid = SCARG(uap, count); 1778 error = VOP_READLINK(vp, &auio, td->td_ucred); 1779 } 1780 vput(vp); 1781 td->td_retval[0] = SCARG(uap, count) - auio.uio_resid; 1782 return (error); 1783} 1784 1785/* 1786 * Common implementation code for chflags() and fchflags(). 1787 */ 1788static int 1789setfflags(td, vp, flags) 1790 struct thread *td; 1791 struct vnode *vp; 1792 int flags; 1793{ 1794 int error; 1795 struct mount *mp; 1796 struct vattr vattr; 1797 1798 /* 1799 * Prevent non-root users from setting flags on devices. When 1800 * a device is reused, users can retain ownership of the device 1801 * if they are allowed to set flags and programs assume that 1802 * chown can't fail when done as root. 1803 */ 1804 if (vp->v_type == VCHR || vp->v_type == VBLK) { 1805 error = suser_cred(td->td_ucred, PRISON_ROOT); 1806 if (error) 1807 return (error); 1808 } 1809 1810 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 1811 return (error); 1812 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 1813 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 1814#ifdef MAC 1815 error = mac_check_vnode_setflags(td->td_ucred, vp, vattr.va_flags); 1816 if (error == 0) { 1817#endif 1818 VATTR_NULL(&vattr); 1819 vattr.va_flags = flags; 1820 error = VOP_SETATTR(vp, &vattr, td->td_ucred, td); 1821#ifdef MAC 1822 } 1823#endif 1824 VOP_UNLOCK(vp, 0, td); 1825 vn_finished_write(mp); 1826 return (error); 1827} 1828 1829/* 1830 * Change flags of a file given a path name. 1831 */ 1832#ifndef _SYS_SYSPROTO_H_ 1833struct chflags_args { 1834 char *path; 1835 int flags; 1836}; 1837#endif 1838/* ARGSUSED */ 1839int 1840chflags(td, uap) 1841 struct thread *td; 1842 register struct chflags_args /* { 1843 syscallarg(char *) path; 1844 syscallarg(int) flags; 1845 } */ *uap; 1846{ 1847 int error; 1848 struct nameidata nd; 1849 1850 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td); 1851 if ((error = namei(&nd)) != 0) 1852 return (error); 1853 NDFREE(&nd, NDF_ONLY_PNBUF); 1854 error = setfflags(td, nd.ni_vp, SCARG(uap, flags)); 1855 vrele(nd.ni_vp); 1856 return error; 1857} 1858 1859/* 1860 * Same as chflags() but doesn't follow symlinks. 1861 */ 1862int 1863lchflags(td, uap) 1864 struct thread *td; 1865 register struct lchflags_args /* { 1866 syscallarg(char *) path; 1867 syscallarg(int) flags; 1868 } */ *uap; 1869{ 1870 int error; 1871 struct nameidata nd; 1872 1873 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), td); 1874 if ((error = namei(&nd)) != 0) 1875 return (error); 1876 NDFREE(&nd, NDF_ONLY_PNBUF); 1877 error = setfflags(td, nd.ni_vp, SCARG(uap, flags)); 1878 vrele(nd.ni_vp); 1879 return error; 1880} 1881 1882/* 1883 * Change flags of a file given a file descriptor. 1884 */ 1885#ifndef _SYS_SYSPROTO_H_ 1886struct fchflags_args { 1887 int fd; 1888 int flags; 1889}; 1890#endif 1891/* ARGSUSED */ 1892int 1893fchflags(td, uap) 1894 struct thread *td; 1895 register struct fchflags_args /* { 1896 syscallarg(int) fd; 1897 syscallarg(int) flags; 1898 } */ *uap; 1899{ 1900 struct file *fp; 1901 int error; 1902 1903 if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 1904 return (error); 1905 error = setfflags(td, (struct vnode *) fp->f_data, SCARG(uap, flags)); 1906 fdrop(fp, td); 1907 return (error); 1908} 1909 1910/* 1911 * Common implementation code for chmod(), lchmod() and fchmod(). 1912 */ 1913static int 1914setfmode(td, vp, mode) 1915 struct thread *td; 1916 struct vnode *vp; 1917 int mode; 1918{ 1919 int error; 1920 struct mount *mp; 1921 struct vattr vattr; 1922 1923 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 1924 return (error); 1925 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 1926 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 1927 VATTR_NULL(&vattr); 1928 vattr.va_mode = mode & ALLPERMS; 1929#ifdef MAC 1930 error = mac_check_vnode_setmode(td->td_ucred, vp, vattr.va_mode); 1931 if (error == 0) 1932#endif 1933 error = VOP_SETATTR(vp, &vattr, td->td_ucred, td); 1934 VOP_UNLOCK(vp, 0, td); 1935 vn_finished_write(mp); 1936 return error; 1937} 1938 1939/* 1940 * Change mode of a file given path name. 1941 */ 1942#ifndef _SYS_SYSPROTO_H_ 1943struct chmod_args { 1944 char *path; 1945 int mode; 1946}; 1947#endif 1948/* ARGSUSED */ 1949int 1950chmod(td, uap) 1951 struct thread *td; 1952 register struct chmod_args /* { 1953 syscallarg(char *) path; 1954 syscallarg(int) mode; 1955 } */ *uap; 1956{ 1957 int error; 1958 struct nameidata nd; 1959 1960 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td); 1961 if ((error = namei(&nd)) != 0) 1962 return (error); 1963 NDFREE(&nd, NDF_ONLY_PNBUF); 1964 error = setfmode(td, nd.ni_vp, SCARG(uap, mode)); 1965 vrele(nd.ni_vp); 1966 return error; 1967} 1968 1969/* 1970 * Change mode of a file given path name (don't follow links.) 1971 */ 1972#ifndef _SYS_SYSPROTO_H_ 1973struct lchmod_args { 1974 char *path; 1975 int mode; 1976}; 1977#endif 1978/* ARGSUSED */ 1979int 1980lchmod(td, uap) 1981 struct thread *td; 1982 register struct lchmod_args /* { 1983 syscallarg(char *) path; 1984 syscallarg(int) mode; 1985 } */ *uap; 1986{ 1987 int error; 1988 struct nameidata nd; 1989 1990 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), td); 1991 if ((error = namei(&nd)) != 0) 1992 return (error); 1993 NDFREE(&nd, NDF_ONLY_PNBUF); 1994 error = setfmode(td, nd.ni_vp, SCARG(uap, mode)); 1995 vrele(nd.ni_vp); 1996 return error; 1997} 1998 1999/* 2000 * Change mode of a file given a file descriptor. 2001 */ 2002#ifndef _SYS_SYSPROTO_H_ 2003struct fchmod_args { 2004 int fd; 2005 int mode; 2006}; 2007#endif 2008/* ARGSUSED */ 2009int 2010fchmod(td, uap) 2011 struct thread *td; 2012 register struct fchmod_args /* { 2013 syscallarg(int) fd; 2014 syscallarg(int) mode; 2015 } */ *uap; 2016{ 2017 struct file *fp; 2018 struct vnode *vp; 2019 int error; 2020 2021 if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 2022 return (error); 2023 vp = (struct vnode *)fp->f_data; 2024 error = setfmode(td, (struct vnode *)fp->f_data, SCARG(uap, mode)); 2025 fdrop(fp, td); 2026 return (error); 2027} 2028 2029/* 2030 * Common implementation for chown(), lchown(), and fchown() 2031 */ 2032static int 2033setfown(td, vp, uid, gid) 2034 struct thread *td; 2035 struct vnode *vp; 2036 uid_t uid; 2037 gid_t gid; 2038{ 2039 int error; 2040 struct mount *mp; 2041 struct vattr vattr; 2042 2043 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2044 return (error); 2045 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 2046 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2047 VATTR_NULL(&vattr); 2048 vattr.va_uid = uid; 2049 vattr.va_gid = gid; 2050#ifdef MAC 2051 error = mac_check_vnode_setowner(td->td_ucred, vp, vattr.va_uid, 2052 vattr.va_gid); 2053 if (error == 0) 2054#endif 2055 error = VOP_SETATTR(vp, &vattr, td->td_ucred, td); 2056 VOP_UNLOCK(vp, 0, td); 2057 vn_finished_write(mp); 2058 return error; 2059} 2060 2061/* 2062 * Set ownership given a path name. 2063 */ 2064#ifndef _SYS_SYSPROTO_H_ 2065struct chown_args { 2066 char *path; 2067 int uid; 2068 int gid; 2069}; 2070#endif 2071/* ARGSUSED */ 2072int 2073chown(td, uap) 2074 struct thread *td; 2075 register struct chown_args /* { 2076 syscallarg(char *) path; 2077 syscallarg(int) uid; 2078 syscallarg(int) gid; 2079 } */ *uap; 2080{ 2081 int error; 2082 struct nameidata nd; 2083 2084 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td); 2085 if ((error = namei(&nd)) != 0) 2086 return (error); 2087 NDFREE(&nd, NDF_ONLY_PNBUF); 2088 error = setfown(td, nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid)); 2089 vrele(nd.ni_vp); 2090 return (error); 2091} 2092 2093/* 2094 * Set ownership given a path name, do not cross symlinks. 2095 */ 2096#ifndef _SYS_SYSPROTO_H_ 2097struct lchown_args { 2098 char *path; 2099 int uid; 2100 int gid; 2101}; 2102#endif 2103/* ARGSUSED */ 2104int 2105lchown(td, uap) 2106 struct thread *td; 2107 register struct lchown_args /* { 2108 syscallarg(char *) path; 2109 syscallarg(int) uid; 2110 syscallarg(int) gid; 2111 } */ *uap; 2112{ 2113 int error; 2114 struct nameidata nd; 2115 2116 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), td); 2117 if ((error = namei(&nd)) != 0) 2118 return (error); 2119 NDFREE(&nd, NDF_ONLY_PNBUF); 2120 error = setfown(td, nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid)); 2121 vrele(nd.ni_vp); 2122 return (error); 2123} 2124 2125/* 2126 * Set ownership given a file descriptor. 2127 */ 2128#ifndef _SYS_SYSPROTO_H_ 2129struct fchown_args { 2130 int fd; 2131 int uid; 2132 int gid; 2133}; 2134#endif 2135/* ARGSUSED */ 2136int 2137fchown(td, uap) 2138 struct thread *td; 2139 register struct fchown_args /* { 2140 syscallarg(int) fd; 2141 syscallarg(int) uid; 2142 syscallarg(int) gid; 2143 } */ *uap; 2144{ 2145 struct file *fp; 2146 struct vnode *vp; 2147 int error; 2148 2149 if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 2150 return (error); 2151 vp = (struct vnode *)fp->f_data; 2152 error = setfown(td, (struct vnode *)fp->f_data, 2153 SCARG(uap, uid), SCARG(uap, gid)); 2154 fdrop(fp, td); 2155 return (error); 2156} 2157 2158/* 2159 * Common implementation code for utimes(), lutimes(), and futimes(). 2160 */ 2161static int 2162getutimes(usrtvp, tsp) 2163 const struct timeval *usrtvp; 2164 struct timespec *tsp; 2165{ 2166 struct timeval tv[2]; 2167 int error; 2168 2169 if (usrtvp == NULL) { 2170 microtime(&tv[0]); 2171 TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]); 2172 tsp[1] = tsp[0]; 2173 } else { 2174 if ((error = copyin(usrtvp, tv, sizeof (tv))) != 0) 2175 return (error); 2176 TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]); 2177 TIMEVAL_TO_TIMESPEC(&tv[1], &tsp[1]); 2178 } 2179 return 0; 2180} 2181 2182/* 2183 * Common implementation code for utimes(), lutimes(), and futimes(). 2184 */ 2185static int 2186setutimes(td, vp, ts, numtimes, nullflag) 2187 struct thread *td; 2188 struct vnode *vp; 2189 const struct timespec *ts; 2190 int numtimes; 2191 int nullflag; 2192{ 2193 int error, setbirthtime; 2194 struct mount *mp; 2195 struct vattr vattr; 2196 2197 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2198 return (error); 2199 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 2200 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2201 setbirthtime = 0; 2202 if (numtimes < 3 && VOP_GETATTR(vp, &vattr, td->td_ucred, td) == 0 && 2203 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 2204 setbirthtime = 1; 2205 VATTR_NULL(&vattr); 2206 vattr.va_atime = ts[0]; 2207 vattr.va_mtime = ts[1]; 2208 if (setbirthtime) 2209 vattr.va_birthtime = ts[1]; 2210 if (numtimes > 2) 2211 vattr.va_birthtime = ts[2]; 2212 if (nullflag) 2213 vattr.va_vaflags |= VA_UTIMES_NULL; 2214#ifdef MAC 2215 error = mac_check_vnode_setutimes(td->td_ucred, vp, vattr.va_atime, 2216 vattr.va_mtime); 2217 if (error == 0) 2218#endif 2219 error = VOP_SETATTR(vp, &vattr, td->td_ucred, td); 2220 VOP_UNLOCK(vp, 0, td); 2221 vn_finished_write(mp); 2222 return error; 2223} 2224 2225/* 2226 * Set the access and modification times of a file. 2227 */ 2228#ifndef _SYS_SYSPROTO_H_ 2229struct utimes_args { 2230 char *path; 2231 struct timeval *tptr; 2232}; 2233#endif 2234/* ARGSUSED */ 2235int 2236utimes(td, uap) 2237 struct thread *td; 2238 register struct utimes_args /* { 2239 syscallarg(char *) path; 2240 syscallarg(struct timeval *) tptr; 2241 } */ *uap; 2242{ 2243 struct timespec ts[2]; 2244 struct timeval *usrtvp; 2245 int error; 2246 struct nameidata nd; 2247 2248 usrtvp = SCARG(uap, tptr); 2249 if ((error = getutimes(usrtvp, ts)) != 0) 2250 return (error); 2251 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td); 2252 if ((error = namei(&nd)) != 0) 2253 return (error); 2254 NDFREE(&nd, NDF_ONLY_PNBUF); 2255 error = setutimes(td, nd.ni_vp, ts, 2, usrtvp == NULL); 2256 vrele(nd.ni_vp); 2257 return (error); 2258} 2259 2260/* 2261 * Set the access and modification times of a file. 2262 */ 2263#ifndef _SYS_SYSPROTO_H_ 2264struct lutimes_args { 2265 char *path; 2266 struct timeval *tptr; 2267}; 2268#endif 2269/* ARGSUSED */ 2270int 2271lutimes(td, uap) 2272 struct thread *td; 2273 register struct lutimes_args /* { 2274 syscallarg(char *) path; 2275 syscallarg(struct timeval *) tptr; 2276 } */ *uap; 2277{ 2278 struct timespec ts[2]; 2279 struct timeval *usrtvp; 2280 int error; 2281 struct nameidata nd; 2282 2283 usrtvp = SCARG(uap, tptr); 2284 if ((error = getutimes(usrtvp, ts)) != 0) 2285 return (error); 2286 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), td); 2287 if ((error = namei(&nd)) != 0) 2288 return (error); 2289 NDFREE(&nd, NDF_ONLY_PNBUF); 2290 error = setutimes(td, nd.ni_vp, ts, 2, usrtvp == NULL); 2291 vrele(nd.ni_vp); 2292 return (error); 2293} 2294 2295/* 2296 * Set the access and modification times of a file. 2297 */ 2298#ifndef _SYS_SYSPROTO_H_ 2299struct futimes_args { 2300 int fd; 2301 struct timeval *tptr; 2302}; 2303#endif 2304/* ARGSUSED */ 2305int 2306futimes(td, uap) 2307 struct thread *td; 2308 register struct futimes_args /* { 2309 syscallarg(int ) fd; 2310 syscallarg(struct timeval *) tptr; 2311 } */ *uap; 2312{ 2313 struct timespec ts[2]; 2314 struct file *fp; 2315 struct timeval *usrtvp; 2316 int error; 2317 2318 usrtvp = SCARG(uap, tptr); 2319 if ((error = getutimes(usrtvp, ts)) != 0) 2320 return (error); 2321 if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 2322 return (error); 2323 error = setutimes(td, (struct vnode *)fp->f_data, ts, 2, usrtvp==NULL); 2324 fdrop(fp, td); 2325 return (error); 2326} 2327 2328/* 2329 * Truncate a file given its path name. 2330 */ 2331#ifndef _SYS_SYSPROTO_H_ 2332struct truncate_args { 2333 char *path; 2334 int pad; 2335 off_t length; 2336}; 2337#endif 2338/* ARGSUSED */ 2339int 2340truncate(td, uap) 2341 struct thread *td; 2342 register struct truncate_args /* { 2343 syscallarg(char *) path; 2344 syscallarg(int) pad; 2345 syscallarg(off_t) length; 2346 } */ *uap; 2347{ 2348 struct mount *mp; 2349 struct vnode *vp; 2350 struct vattr vattr; 2351 int error; 2352 struct nameidata nd; 2353 2354 if (uap->length < 0) 2355 return(EINVAL); 2356 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), td); 2357 if ((error = namei(&nd)) != 0) 2358 return (error); 2359 vp = nd.ni_vp; 2360 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 2361 vrele(vp); 2362 return (error); 2363 } 2364 NDFREE(&nd, NDF_ONLY_PNBUF); 2365 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 2366 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2367 if (vp->v_type == VDIR) 2368 error = EISDIR; 2369#ifdef MAC 2370 else if ((error = mac_check_vnode_op(td->td_ucred, vp, 2371 MAC_OP_VNODE_WRITE))) {} 2372#endif 2373 else if ((error = vn_writechk(vp)) == 0 && 2374 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 2375 VATTR_NULL(&vattr); 2376 vattr.va_size = SCARG(uap, length); 2377 error = VOP_SETATTR(vp, &vattr, td->td_ucred, td); 2378 } 2379 vput(vp); 2380 vn_finished_write(mp); 2381 return (error); 2382} 2383 2384/* 2385 * Truncate a file given a file descriptor. 2386 */ 2387#ifndef _SYS_SYSPROTO_H_ 2388struct ftruncate_args { 2389 int fd; 2390 int pad; 2391 off_t length; 2392}; 2393#endif 2394/* ARGSUSED */ 2395int 2396ftruncate(td, uap) 2397 struct thread *td; 2398 register struct ftruncate_args /* { 2399 syscallarg(int) fd; 2400 syscallarg(int) pad; 2401 syscallarg(off_t) length; 2402 } */ *uap; 2403{ 2404 struct mount *mp; 2405 struct vattr vattr; 2406 struct vnode *vp; 2407 struct file *fp; 2408 int error; 2409 2410 if (uap->length < 0) 2411 return(EINVAL); 2412 if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 2413 return (error); 2414 if ((fp->f_flag & FWRITE) == 0) { 2415 fdrop(fp, td); 2416 return (EINVAL); 2417 } 2418 vp = (struct vnode *)fp->f_data; 2419 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 2420 fdrop(fp, td); 2421 return (error); 2422 } 2423 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 2424 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2425 if (vp->v_type == VDIR) 2426 error = EISDIR; 2427#ifdef MAC 2428 else if ((error = mac_check_vnode_op(td->td_ucred, vp, 2429 MAC_OP_VNODE_WRITE))) {} 2430#endif 2431 else if ((error = vn_writechk(vp)) == 0) { 2432 VATTR_NULL(&vattr); 2433 vattr.va_size = SCARG(uap, length); 2434 error = VOP_SETATTR(vp, &vattr, fp->f_cred, td); 2435 } 2436 VOP_UNLOCK(vp, 0, td); 2437 vn_finished_write(mp); 2438 fdrop(fp, td); 2439 return (error); 2440} 2441 2442#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 2443/* 2444 * Truncate a file given its path name. 2445 */ 2446#ifndef _SYS_SYSPROTO_H_ 2447struct otruncate_args { 2448 char *path; 2449 long length; 2450}; 2451#endif 2452/* ARGSUSED */ 2453int 2454otruncate(td, uap) 2455 struct thread *td; 2456 register struct otruncate_args /* { 2457 syscallarg(char *) path; 2458 syscallarg(long) length; 2459 } */ *uap; 2460{ 2461 struct truncate_args /* { 2462 syscallarg(char *) path; 2463 syscallarg(int) pad; 2464 syscallarg(off_t) length; 2465 } */ nuap; 2466 2467 SCARG(&nuap, path) = SCARG(uap, path); 2468 SCARG(&nuap, length) = SCARG(uap, length); 2469 return (truncate(td, &nuap)); 2470} 2471 2472/* 2473 * Truncate a file given a file descriptor. 2474 */ 2475#ifndef _SYS_SYSPROTO_H_ 2476struct oftruncate_args { 2477 int fd; 2478 long length; 2479}; 2480#endif 2481/* ARGSUSED */ 2482int 2483oftruncate(td, uap) 2484 struct thread *td; 2485 register struct oftruncate_args /* { 2486 syscallarg(int) fd; 2487 syscallarg(long) length; 2488 } */ *uap; 2489{ 2490 struct ftruncate_args /* { 2491 syscallarg(int) fd; 2492 syscallarg(int) pad; 2493 syscallarg(off_t) length; 2494 } */ nuap; 2495 2496 SCARG(&nuap, fd) = SCARG(uap, fd); 2497 SCARG(&nuap, length) = SCARG(uap, length); 2498 return (ftruncate(td, &nuap)); 2499} 2500#endif /* COMPAT_43 || COMPAT_SUNOS */ 2501 2502/* 2503 * Sync an open file. 2504 */ 2505#ifndef _SYS_SYSPROTO_H_ 2506struct fsync_args { 2507 int fd; 2508}; 2509#endif 2510/* ARGSUSED */ 2511int 2512fsync(td, uap) 2513 struct thread *td; 2514 struct fsync_args /* { 2515 syscallarg(int) fd; 2516 } */ *uap; 2517{ 2518 struct vnode *vp; 2519 struct mount *mp; 2520 struct file *fp; 2521 vm_object_t obj; 2522 int error; 2523 2524 GIANT_REQUIRED; 2525 2526 if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 2527 return (error); 2528 vp = (struct vnode *)fp->f_data; 2529 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 2530 fdrop(fp, td); 2531 return (error); 2532 } 2533 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2534 if (VOP_GETVOBJECT(vp, &obj) == 0) { 2535 vm_object_page_clean(obj, 0, 0, 0); 2536 } 2537 error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, td); 2538 if (error == 0 && vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP) 2539 && softdep_fsync_hook != NULL) 2540 error = (*softdep_fsync_hook)(vp); 2541 2542 VOP_UNLOCK(vp, 0, td); 2543 vn_finished_write(mp); 2544 fdrop(fp, td); 2545 return (error); 2546} 2547 2548/* 2549 * Rename files. Source and destination must either both be directories, 2550 * or both not be directories. If target is a directory, it must be empty. 2551 */ 2552#ifndef _SYS_SYSPROTO_H_ 2553struct rename_args { 2554 char *from; 2555 char *to; 2556}; 2557#endif 2558/* ARGSUSED */ 2559int 2560rename(td, uap) 2561 struct thread *td; 2562 register struct rename_args /* { 2563 syscallarg(char *) from; 2564 syscallarg(char *) to; 2565 } */ *uap; 2566{ 2567 struct mount *mp; 2568 struct vnode *tvp, *fvp, *tdvp; 2569 struct nameidata fromnd, tond; 2570 int error; 2571 2572 bwillwrite(); 2573 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2574 SCARG(uap, from), td); 2575 if ((error = namei(&fromnd)) != 0) 2576 return (error); 2577 fvp = fromnd.ni_vp; 2578 if ((error = vn_start_write(fvp, &mp, V_WAIT | PCATCH)) != 0) { 2579 NDFREE(&fromnd, NDF_ONLY_PNBUF); 2580 vrele(fromnd.ni_dvp); 2581 vrele(fvp); 2582 goto out1; 2583 } 2584 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | NOOBJ, 2585 UIO_USERSPACE, SCARG(uap, to), td); 2586 if (fromnd.ni_vp->v_type == VDIR) 2587 tond.ni_cnd.cn_flags |= WILLBEDIR; 2588 if ((error = namei(&tond)) != 0) { 2589 /* Translate error code for rename("dir1", "dir2/."). */ 2590 if (error == EISDIR && fvp->v_type == VDIR) 2591 error = EINVAL; 2592 NDFREE(&fromnd, NDF_ONLY_PNBUF); 2593 vrele(fromnd.ni_dvp); 2594 vrele(fvp); 2595 goto out1; 2596 } 2597 tdvp = tond.ni_dvp; 2598 tvp = tond.ni_vp; 2599 if (tvp != NULL) { 2600 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2601 error = ENOTDIR; 2602 goto out; 2603 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2604 error = EISDIR; 2605 goto out; 2606 } 2607 } 2608 if (fvp == tdvp) 2609 error = EINVAL; 2610 /* 2611 * If source is the same as the destination (that is the 2612 * same inode number with the same name in the same directory), 2613 * then there is nothing to do. 2614 */ 2615 if (fvp == tvp && fromnd.ni_dvp == tdvp && 2616 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2617 !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, 2618 fromnd.ni_cnd.cn_namelen)) 2619 error = -1; 2620out: 2621 if (!error) { 2622 VOP_LEASE(tdvp, td, td->td_ucred, LEASE_WRITE); 2623 if (fromnd.ni_dvp != tdvp) { 2624 VOP_LEASE(fromnd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 2625 } 2626 if (tvp) { 2627 VOP_LEASE(tvp, td, td->td_ucred, LEASE_WRITE); 2628 } 2629 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2630 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2631 NDFREE(&fromnd, NDF_ONLY_PNBUF); 2632 NDFREE(&tond, NDF_ONLY_PNBUF); 2633 } else { 2634 NDFREE(&fromnd, NDF_ONLY_PNBUF); 2635 NDFREE(&tond, NDF_ONLY_PNBUF); 2636 if (tdvp == tvp) 2637 vrele(tdvp); 2638 else 2639 vput(tdvp); 2640 if (tvp) 2641 vput(tvp); 2642 vrele(fromnd.ni_dvp); 2643 vrele(fvp); 2644 } 2645 vrele(tond.ni_startdir); 2646 vn_finished_write(mp); 2647 ASSERT_VOP_UNLOCKED(fromnd.ni_dvp, "rename"); 2648 ASSERT_VOP_UNLOCKED(fromnd.ni_vp, "rename"); 2649 ASSERT_VOP_UNLOCKED(tond.ni_dvp, "rename"); 2650 ASSERT_VOP_UNLOCKED(tond.ni_vp, "rename"); 2651out1: 2652 if (fromnd.ni_startdir) 2653 vrele(fromnd.ni_startdir); 2654 if (error == -1) 2655 return (0); 2656 return (error); 2657} 2658 2659/* 2660 * Make a directory file. 2661 */ 2662#ifndef _SYS_SYSPROTO_H_ 2663struct mkdir_args { 2664 char *path; 2665 int mode; 2666}; 2667#endif 2668/* ARGSUSED */ 2669int 2670mkdir(td, uap) 2671 struct thread *td; 2672 register struct mkdir_args /* { 2673 syscallarg(char *) path; 2674 syscallarg(int) mode; 2675 } */ *uap; 2676{ 2677 2678 return vn_mkdir(uap->path, uap->mode, UIO_USERSPACE, td); 2679} 2680 2681int 2682vn_mkdir(path, mode, segflg, td) 2683 char *path; 2684 int mode; 2685 enum uio_seg segflg; 2686 struct thread *td; 2687{ 2688 struct mount *mp; 2689 struct vnode *vp; 2690 struct vattr vattr; 2691 int error; 2692 struct nameidata nd; 2693 2694restart: 2695 bwillwrite(); 2696 NDINIT(&nd, CREATE, LOCKPARENT | SAVENAME, segflg, path, td); 2697 nd.ni_cnd.cn_flags |= WILLBEDIR; 2698 if ((error = namei(&nd)) != 0) 2699 return (error); 2700 vp = nd.ni_vp; 2701 if (vp != NULL) { 2702 NDFREE(&nd, NDF_ONLY_PNBUF); 2703 vrele(vp); 2704 /* 2705 * XXX namei called with LOCKPARENT but not LOCKLEAF has 2706 * the strange behaviour of leaving the vnode unlocked 2707 * if the target is the same vnode as the parent. 2708 */ 2709 if (vp == nd.ni_dvp) 2710 vrele(nd.ni_dvp); 2711 else 2712 vput(nd.ni_dvp); 2713 return (EEXIST); 2714 } 2715 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 2716 NDFREE(&nd, NDF_ONLY_PNBUF); 2717 vput(nd.ni_dvp); 2718 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 2719 return (error); 2720 goto restart; 2721 } 2722 VATTR_NULL(&vattr); 2723 vattr.va_type = VDIR; 2724 FILEDESC_LOCK(td->td_proc->p_fd); 2725 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask; 2726 FILEDESC_UNLOCK(td->td_proc->p_fd); 2727 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 2728 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2729 NDFREE(&nd, NDF_ONLY_PNBUF); 2730 vput(nd.ni_dvp); 2731 if (!error) 2732 vput(nd.ni_vp); 2733 vn_finished_write(mp); 2734 ASSERT_VOP_UNLOCKED(nd.ni_dvp, "mkdir"); 2735 ASSERT_VOP_UNLOCKED(nd.ni_vp, "mkdir"); 2736 return (error); 2737} 2738 2739/* 2740 * Remove a directory file. 2741 */ 2742#ifndef _SYS_SYSPROTO_H_ 2743struct rmdir_args { 2744 char *path; 2745}; 2746#endif 2747/* ARGSUSED */ 2748int 2749rmdir(td, uap) 2750 struct thread *td; 2751 struct rmdir_args /* { 2752 syscallarg(char *) path; 2753 } */ *uap; 2754{ 2755 struct mount *mp; 2756 struct vnode *vp; 2757 int error; 2758 struct nameidata nd; 2759 2760restart: 2761 bwillwrite(); 2762 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2763 SCARG(uap, path), td); 2764 if ((error = namei(&nd)) != 0) 2765 return (error); 2766 vp = nd.ni_vp; 2767 if (vp->v_type != VDIR) { 2768 error = ENOTDIR; 2769 goto out; 2770 } 2771 /* 2772 * No rmdir "." please. 2773 */ 2774 if (nd.ni_dvp == vp) { 2775 error = EINVAL; 2776 goto out; 2777 } 2778 /* 2779 * The root of a mounted filesystem cannot be deleted. 2780 */ 2781 if (vp->v_flag & VROOT) { 2782 error = EBUSY; 2783 goto out; 2784 } 2785 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 2786 NDFREE(&nd, NDF_ONLY_PNBUF); 2787 if (nd.ni_dvp == vp) 2788 vrele(nd.ni_dvp); 2789 else 2790 vput(nd.ni_dvp); 2791 vput(vp); 2792 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 2793 return (error); 2794 goto restart; 2795 } 2796 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE); 2797 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 2798 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2799 vn_finished_write(mp); 2800out: 2801 NDFREE(&nd, NDF_ONLY_PNBUF); 2802 if (nd.ni_dvp == vp) 2803 vrele(nd.ni_dvp); 2804 else 2805 vput(nd.ni_dvp); 2806 vput(vp); 2807 ASSERT_VOP_UNLOCKED(nd.ni_dvp, "rmdir"); 2808 ASSERT_VOP_UNLOCKED(nd.ni_vp, "rmdir"); 2809 return (error); 2810} 2811 2812#ifdef COMPAT_43 2813/* 2814 * Read a block of directory entries in a filesystem independent format. 2815 */ 2816#ifndef _SYS_SYSPROTO_H_ 2817struct ogetdirentries_args { 2818 int fd; 2819 char *buf; 2820 u_int count; 2821 long *basep; 2822}; 2823#endif 2824int 2825ogetdirentries(td, uap) 2826 struct thread *td; 2827 register struct ogetdirentries_args /* { 2828 syscallarg(int) fd; 2829 syscallarg(char *) buf; 2830 syscallarg(u_int) count; 2831 syscallarg(long *) basep; 2832 } */ *uap; 2833{ 2834 struct vnode *vp; 2835 struct file *fp; 2836 struct uio auio, kuio; 2837 struct iovec aiov, kiov; 2838 struct dirent *dp, *edp; 2839 caddr_t dirbuf; 2840 int error, eofflag, readcnt; 2841 long loff; 2842 2843 /* XXX arbitrary sanity limit on `count'. */ 2844 if (SCARG(uap, count) > 64 * 1024) 2845 return (EINVAL); 2846 if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 2847 return (error); 2848 if ((fp->f_flag & FREAD) == 0) { 2849 fdrop(fp, td); 2850 return (EBADF); 2851 } 2852 vp = (struct vnode *)fp->f_data; 2853unionread: 2854 if (vp->v_type != VDIR) { 2855 fdrop(fp, td); 2856 return (EINVAL); 2857 } 2858 aiov.iov_base = SCARG(uap, buf); 2859 aiov.iov_len = SCARG(uap, count); 2860 auio.uio_iov = &aiov; 2861 auio.uio_iovcnt = 1; 2862 auio.uio_rw = UIO_READ; 2863 auio.uio_segflg = UIO_USERSPACE; 2864 auio.uio_td = td; 2865 auio.uio_resid = SCARG(uap, count); 2866 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2867 loff = auio.uio_offset = fp->f_offset; 2868# if (BYTE_ORDER != LITTLE_ENDIAN) 2869 if (vp->v_mount->mnt_maxsymlinklen <= 0) { 2870 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 2871 NULL, NULL); 2872 fp->f_offset = auio.uio_offset; 2873 } else 2874# endif 2875 { 2876 kuio = auio; 2877 kuio.uio_iov = &kiov; 2878 kuio.uio_segflg = UIO_SYSSPACE; 2879 kiov.iov_len = SCARG(uap, count); 2880 MALLOC(dirbuf, caddr_t, SCARG(uap, count), M_TEMP, M_WAITOK); 2881 kiov.iov_base = dirbuf; 2882 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, 2883 NULL, NULL); 2884 fp->f_offset = kuio.uio_offset; 2885 if (error == 0) { 2886 readcnt = SCARG(uap, count) - kuio.uio_resid; 2887 edp = (struct dirent *)&dirbuf[readcnt]; 2888 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 2889# if (BYTE_ORDER == LITTLE_ENDIAN) 2890 /* 2891 * The expected low byte of 2892 * dp->d_namlen is our dp->d_type. 2893 * The high MBZ byte of dp->d_namlen 2894 * is our dp->d_namlen. 2895 */ 2896 dp->d_type = dp->d_namlen; 2897 dp->d_namlen = 0; 2898# else 2899 /* 2900 * The dp->d_type is the high byte 2901 * of the expected dp->d_namlen, 2902 * so must be zero'ed. 2903 */ 2904 dp->d_type = 0; 2905# endif 2906 if (dp->d_reclen > 0) { 2907 dp = (struct dirent *) 2908 ((char *)dp + dp->d_reclen); 2909 } else { 2910 error = EIO; 2911 break; 2912 } 2913 } 2914 if (dp >= edp) 2915 error = uiomove(dirbuf, readcnt, &auio); 2916 } 2917 FREE(dirbuf, M_TEMP); 2918 } 2919 VOP_UNLOCK(vp, 0, td); 2920 if (error) { 2921 fdrop(fp, td); 2922 return (error); 2923 } 2924 if (SCARG(uap, count) == auio.uio_resid) { 2925 if (union_dircheckp) { 2926 error = union_dircheckp(td, &vp, fp); 2927 if (error == -1) 2928 goto unionread; 2929 if (error) { 2930 fdrop(fp, td); 2931 return (error); 2932 } 2933 } 2934 if ((vp->v_flag & VROOT) && 2935 (vp->v_mount->mnt_flag & MNT_UNION)) { 2936 struct vnode *tvp = vp; 2937 vp = vp->v_mount->mnt_vnodecovered; 2938 VREF(vp); 2939 fp->f_data = vp; 2940 fp->f_offset = 0; 2941 vrele(tvp); 2942 goto unionread; 2943 } 2944 } 2945 error = copyout(&loff, SCARG(uap, basep), sizeof(long)); 2946 fdrop(fp, td); 2947 td->td_retval[0] = SCARG(uap, count) - auio.uio_resid; 2948 return (error); 2949} 2950#endif /* COMPAT_43 */ 2951 2952/* 2953 * Read a block of directory entries in a filesystem independent format. 2954 */ 2955#ifndef _SYS_SYSPROTO_H_ 2956struct getdirentries_args { 2957 int fd; 2958 char *buf; 2959 u_int count; 2960 long *basep; 2961}; 2962#endif 2963int 2964getdirentries(td, uap) 2965 struct thread *td; 2966 register struct getdirentries_args /* { 2967 syscallarg(int) fd; 2968 syscallarg(char *) buf; 2969 syscallarg(u_int) count; 2970 syscallarg(long *) basep; 2971 } */ *uap; 2972{ 2973 struct vnode *vp; 2974 struct file *fp; 2975 struct uio auio; 2976 struct iovec aiov; 2977 long loff; 2978 int error, eofflag; 2979 2980 if ((error = getvnode(td->td_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 2981 return (error); 2982 if ((fp->f_flag & FREAD) == 0) { 2983 fdrop(fp, td); 2984 return (EBADF); 2985 } 2986 vp = (struct vnode *)fp->f_data; 2987unionread: 2988 if (vp->v_type != VDIR) { 2989 fdrop(fp, td); 2990 return (EINVAL); 2991 } 2992 aiov.iov_base = SCARG(uap, buf); 2993 aiov.iov_len = SCARG(uap, count); 2994 auio.uio_iov = &aiov; 2995 auio.uio_iovcnt = 1; 2996 auio.uio_rw = UIO_READ; 2997 auio.uio_segflg = UIO_USERSPACE; 2998 auio.uio_td = td; 2999 auio.uio_resid = SCARG(uap, count); 3000 /* vn_lock(vp, LK_SHARED | LK_RETRY, td); */ 3001 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3002 loff = auio.uio_offset = fp->f_offset; 3003 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL); 3004 fp->f_offset = auio.uio_offset; 3005 VOP_UNLOCK(vp, 0, td); 3006 if (error) { 3007 fdrop(fp, td); 3008 return (error); 3009 } 3010 if (SCARG(uap, count) == auio.uio_resid) { 3011 if (union_dircheckp) { 3012 error = union_dircheckp(td, &vp, fp); 3013 if (error == -1) 3014 goto unionread; 3015 if (error) { 3016 fdrop(fp, td); 3017 return (error); 3018 } 3019 } 3020 if ((vp->v_flag & VROOT) && 3021 (vp->v_mount->mnt_flag & MNT_UNION)) { 3022 struct vnode *tvp = vp; 3023 vp = vp->v_mount->mnt_vnodecovered; 3024 VREF(vp); 3025 fp->f_data = vp; 3026 fp->f_offset = 0; 3027 vrele(tvp); 3028 goto unionread; 3029 } 3030 } 3031 if (SCARG(uap, basep) != NULL) { 3032 error = copyout(&loff, SCARG(uap, basep), sizeof(long)); 3033 } 3034 td->td_retval[0] = SCARG(uap, count) - auio.uio_resid; 3035 fdrop(fp, td); 3036 return (error); 3037} 3038#ifndef _SYS_SYSPROTO_H_ 3039struct getdents_args { 3040 int fd; 3041 char *buf; 3042 size_t count; 3043}; 3044#endif 3045int 3046getdents(td, uap) 3047 struct thread *td; 3048 register struct getdents_args /* { 3049 syscallarg(int) fd; 3050 syscallarg(char *) buf; 3051 syscallarg(u_int) count; 3052 } */ *uap; 3053{ 3054 struct getdirentries_args ap; 3055 ap.fd = uap->fd; 3056 ap.buf = uap->buf; 3057 ap.count = uap->count; 3058 ap.basep = NULL; 3059 return getdirentries(td, &ap); 3060} 3061 3062/* 3063 * Set the mode mask for creation of filesystem nodes. 3064 * 3065 * MP SAFE 3066 */ 3067#ifndef _SYS_SYSPROTO_H_ 3068struct umask_args { 3069 int newmask; 3070}; 3071#endif 3072int 3073umask(td, uap) 3074 struct thread *td; 3075 struct umask_args /* { 3076 syscallarg(int) newmask; 3077 } */ *uap; 3078{ 3079 register struct filedesc *fdp; 3080 3081 FILEDESC_LOCK(td->td_proc->p_fd); 3082 fdp = td->td_proc->p_fd; 3083 td->td_retval[0] = fdp->fd_cmask; 3084 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 3085 FILEDESC_UNLOCK(td->td_proc->p_fd); 3086 return (0); 3087} 3088 3089/* 3090 * Void all references to file by ripping underlying filesystem 3091 * away from vnode. 3092 */ 3093#ifndef _SYS_SYSPROTO_H_ 3094struct revoke_args { 3095 char *path; 3096}; 3097#endif 3098/* ARGSUSED */ 3099int 3100revoke(td, uap) 3101 struct thread *td; 3102 register struct revoke_args /* { 3103 syscallarg(char *) path; 3104 } */ *uap; 3105{ 3106 struct mount *mp; 3107 struct vnode *vp; 3108 struct vattr vattr; 3109 int error; 3110 struct nameidata nd; 3111 3112 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), 3113 td); 3114 if ((error = namei(&nd)) != 0) 3115 return (error); 3116 vp = nd.ni_vp; 3117 NDFREE(&nd, NDF_ONLY_PNBUF); 3118 if (vp->v_type != VCHR) { 3119 vput(vp); 3120 return (EINVAL); 3121 } 3122#ifdef MAC 3123 error = mac_check_vnode_revoke(td->td_ucred, vp); 3124 if (error) { 3125 vput(vp); 3126 return (error); 3127 } 3128#endif 3129 error = VOP_GETATTR(vp, &vattr, td->td_ucred, td); 3130 if (error) { 3131 vput(vp); 3132 return (error); 3133 } 3134 VOP_UNLOCK(vp, 0, td); 3135 if (td->td_ucred->cr_uid != vattr.va_uid) { 3136 error = suser_cred(td->td_ucred, PRISON_ROOT); 3137 if (error) 3138 goto out; 3139 } 3140 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3141 goto out; 3142 if (vcount(vp) > 1) 3143 VOP_REVOKE(vp, REVOKEALL); 3144 vn_finished_write(mp); 3145out: 3146 vrele(vp); 3147 return (error); 3148} 3149 3150/* 3151 * Convert a user file descriptor to a kernel file entry. 3152 * The file entry is locked upon returning. 3153 */ 3154int 3155getvnode(fdp, fd, fpp) 3156 struct filedesc *fdp; 3157 int fd; 3158 struct file **fpp; 3159{ 3160 int error; 3161 struct file *fp; 3162 3163 fp = NULL; 3164 if (fdp == NULL) 3165 error = EBADF; 3166 else { 3167 FILEDESC_LOCK(fdp); 3168 if ((u_int)fd >= fdp->fd_nfiles || 3169 (fp = fdp->fd_ofiles[fd]) == NULL) 3170 error = EBADF; 3171 else if (fp->f_type != DTYPE_VNODE && fp->f_type != DTYPE_FIFO) { 3172 fp = NULL; 3173 error = EINVAL; 3174 } else { 3175 fhold(fp); 3176 error = 0; 3177 } 3178 FILEDESC_UNLOCK(fdp); 3179 } 3180 *fpp = fp; 3181 return (error); 3182} 3183/* 3184 * Get (NFS) file handle 3185 */ 3186#ifndef _SYS_SYSPROTO_H_ 3187struct getfh_args { 3188 char *fname; 3189 fhandle_t *fhp; 3190}; 3191#endif 3192int 3193getfh(td, uap) 3194 struct thread *td; 3195 register struct getfh_args *uap; 3196{ 3197 struct nameidata nd; 3198 fhandle_t fh; 3199 register struct vnode *vp; 3200 int error; 3201 3202 /* 3203 * Must be super user 3204 */ 3205 error = suser(td); 3206 if (error) 3207 return (error); 3208 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->fname, td); 3209 error = namei(&nd); 3210 if (error) 3211 return (error); 3212 NDFREE(&nd, NDF_ONLY_PNBUF); 3213 vp = nd.ni_vp; 3214 bzero(&fh, sizeof(fh)); 3215 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 3216 error = VFS_VPTOFH(vp, &fh.fh_fid); 3217 vput(vp); 3218 if (error) 3219 return (error); 3220 error = copyout(&fh, uap->fhp, sizeof (fh)); 3221 return (error); 3222} 3223 3224/* 3225 * syscall for the rpc.lockd to use to translate a NFS file handle into 3226 * an open descriptor. 3227 * 3228 * warning: do not remove the suser() call or this becomes one giant 3229 * security hole. 3230 */ 3231#ifndef _SYS_SYSPROTO_H_ 3232struct fhopen_args { 3233 const struct fhandle *u_fhp; 3234 int flags; 3235}; 3236#endif 3237int 3238fhopen(td, uap) 3239 struct thread *td; 3240 struct fhopen_args /* { 3241 syscallarg(const struct fhandle *) u_fhp; 3242 syscallarg(int) flags; 3243 } */ *uap; 3244{ 3245 struct proc *p = td->td_proc; 3246 struct mount *mp; 3247 struct vnode *vp; 3248 struct fhandle fhp; 3249 struct vattr vat; 3250 struct vattr *vap = &vat; 3251 struct flock lf; 3252 struct file *fp; 3253 register struct filedesc *fdp = p->p_fd; 3254 int fmode, mode, error, type; 3255 struct file *nfp; 3256 int indx; 3257 3258 /* 3259 * Must be super user 3260 */ 3261 error = suser(td); 3262 if (error) 3263 return (error); 3264 3265 fmode = FFLAGS(SCARG(uap, flags)); 3266 /* why not allow a non-read/write open for our lockd? */ 3267 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 3268 return (EINVAL); 3269 error = copyin(SCARG(uap,u_fhp), &fhp, sizeof(fhp)); 3270 if (error) 3271 return(error); 3272 /* find the mount point */ 3273 mp = vfs_getvfs(&fhp.fh_fsid); 3274 if (mp == NULL) 3275 return (ESTALE); 3276 /* now give me my vnode, it gets returned to me locked */ 3277 error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp); 3278 if (error) 3279 return (error); 3280 /* 3281 * from now on we have to make sure not 3282 * to forget about the vnode 3283 * any error that causes an abort must vput(vp) 3284 * just set error = err and 'goto bad;'. 3285 */ 3286 3287 /* 3288 * from vn_open 3289 */ 3290 if (vp->v_type == VLNK) { 3291 error = EMLINK; 3292 goto bad; 3293 } 3294 if (vp->v_type == VSOCK) { 3295 error = EOPNOTSUPP; 3296 goto bad; 3297 } 3298 mode = 0; 3299 if (fmode & (FWRITE | O_TRUNC)) { 3300 if (vp->v_type == VDIR) { 3301 error = EISDIR; 3302 goto bad; 3303 } 3304 error = vn_writechk(vp); 3305 if (error) 3306 goto bad; 3307 mode |= VWRITE; 3308 } 3309 if (fmode & FREAD) 3310 mode |= VREAD; 3311 if (fmode & O_APPEND) 3312 mode |= VAPPEND; 3313#ifdef MAC 3314 error = mac_check_vnode_open(td->td_ucred, vp, mode); 3315 if (error) 3316 goto bad; 3317#endif 3318 if (mode) { 3319 error = VOP_ACCESS(vp, mode, td->td_ucred, td); 3320 if (error) 3321 goto bad; 3322 } 3323 if (fmode & O_TRUNC) { 3324 VOP_UNLOCK(vp, 0, td); /* XXX */ 3325 if ((error = vn_start_write(NULL, &mp, V_WAIT | PCATCH)) != 0) { 3326 vrele(vp); 3327 return (error); 3328 } 3329 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 3330 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); /* XXX */ 3331#ifdef MAC 3332 error = mac_check_vnode_op(td->td_ucred, vp, 3333 MAC_OP_VNODE_WRITE); 3334 if (error == 0) { 3335#endif 3336 VATTR_NULL(vap); 3337 vap->va_size = 0; 3338 error = VOP_SETATTR(vp, vap, td->td_ucred, td); 3339#ifdef MAC 3340 } 3341#endif 3342 vn_finished_write(mp); 3343 if (error) 3344 goto bad; 3345 } 3346 error = VOP_OPEN(vp, fmode, td->td_ucred, td); 3347 if (error) 3348 goto bad; 3349 /* 3350 * Make sure that a VM object is created for VMIO support. 3351 */ 3352 if (vn_canvmio(vp) == TRUE) { 3353 if ((error = vfs_object_create(vp, td, td->td_ucred)) != 0) 3354 goto bad; 3355 } 3356 if (fmode & FWRITE) 3357 vp->v_writecount++; 3358 3359 /* 3360 * end of vn_open code 3361 */ 3362 3363 if ((error = falloc(td, &nfp, &indx)) != 0) { 3364 if (fmode & FWRITE) 3365 vp->v_writecount--; 3366 goto bad; 3367 } 3368 fp = nfp; 3369 3370 /* 3371 * Hold an extra reference to avoid having fp ripped out 3372 * from under us while we block in the lock op 3373 */ 3374 fhold(fp); 3375 nfp->f_data = vp; 3376 nfp->f_flag = fmode & FMASK; 3377 nfp->f_ops = &vnops; 3378 nfp->f_type = DTYPE_VNODE; 3379 if (fmode & (O_EXLOCK | O_SHLOCK)) { 3380 lf.l_whence = SEEK_SET; 3381 lf.l_start = 0; 3382 lf.l_len = 0; 3383 if (fmode & O_EXLOCK) 3384 lf.l_type = F_WRLCK; 3385 else 3386 lf.l_type = F_RDLCK; 3387 type = F_FLOCK; 3388 if ((fmode & FNONBLOCK) == 0) 3389 type |= F_WAIT; 3390 VOP_UNLOCK(vp, 0, td); 3391 if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, 3392 type)) != 0) { 3393 /* 3394 * The lock request failed. Normally close the 3395 * descriptor but handle the case where someone might 3396 * have dup()d or close()d it when we weren't looking. 3397 */ 3398 FILEDESC_LOCK(fdp); 3399 if (fdp->fd_ofiles[indx] == fp) { 3400 fdp->fd_ofiles[indx] = NULL; 3401 FILEDESC_UNLOCK(fdp); 3402 fdrop(fp, td); 3403 } else 3404 FILEDESC_UNLOCK(fdp); 3405 /* 3406 * release our private reference 3407 */ 3408 fdrop(fp, td); 3409 return(error); 3410 } 3411 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3412 fp->f_flag |= FHASLOCK; 3413 } 3414 if ((vp->v_type == VREG) && (VOP_GETVOBJECT(vp, NULL) != 0)) 3415 vfs_object_create(vp, td, td->td_ucred); 3416 3417 VOP_UNLOCK(vp, 0, td); 3418 fdrop(fp, td); 3419 td->td_retval[0] = indx; 3420 return (0); 3421 3422bad: 3423 vput(vp); 3424 return (error); 3425} 3426 3427/* 3428 * Stat an (NFS) file handle. 3429 */ 3430#ifndef _SYS_SYSPROTO_H_ 3431struct fhstat_args { 3432 struct fhandle *u_fhp; 3433 struct stat *sb; 3434}; 3435#endif 3436int 3437fhstat(td, uap) 3438 struct thread *td; 3439 register struct fhstat_args /* { 3440 syscallarg(struct fhandle *) u_fhp; 3441 syscallarg(struct stat *) sb; 3442 } */ *uap; 3443{ 3444 struct stat sb; 3445 fhandle_t fh; 3446 struct mount *mp; 3447 struct vnode *vp; 3448 int error; 3449 3450 /* 3451 * Must be super user 3452 */ 3453 error = suser(td); 3454 if (error) 3455 return (error); 3456 3457 error = copyin(SCARG(uap, u_fhp), &fh, sizeof(fhandle_t)); 3458 if (error) 3459 return (error); 3460 3461 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 3462 return (ESTALE); 3463 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 3464 return (error); 3465 error = vn_stat(vp, &sb, td); 3466 vput(vp); 3467 if (error) 3468 return (error); 3469 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 3470 return (error); 3471} 3472 3473/* 3474 * Implement fstatfs() for (NFS) file handles. 3475 */ 3476#ifndef _SYS_SYSPROTO_H_ 3477struct fhstatfs_args { 3478 struct fhandle *u_fhp; 3479 struct statfs *buf; 3480}; 3481#endif 3482int 3483fhstatfs(td, uap) 3484 struct thread *td; 3485 struct fhstatfs_args /* { 3486 syscallarg(struct fhandle) *u_fhp; 3487 syscallarg(struct statfs) *buf; 3488 } */ *uap; 3489{ 3490 struct statfs *sp; 3491 struct mount *mp; 3492 struct vnode *vp; 3493 struct statfs sb; 3494 fhandle_t fh; 3495 int error; 3496 3497 /* 3498 * Must be super user 3499 */ 3500 error = suser(td); 3501 if (error) 3502 return (error); 3503 3504 if ((error = copyin(SCARG(uap, u_fhp), &fh, sizeof(fhandle_t))) != 0) 3505 return (error); 3506 3507 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 3508 return (ESTALE); 3509 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 3510 return (error); 3511 mp = vp->v_mount; 3512 sp = &mp->mnt_stat; 3513 vput(vp); 3514#ifdef MAC 3515 error = mac_check_mount_stat(td->td_ucred, mp); 3516 if (error) 3517 return (error); 3518#endif 3519 if ((error = VFS_STATFS(mp, sp, td)) != 0) 3520 return (error); 3521 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 3522 if (suser(td)) { 3523 bcopy(sp, &sb, sizeof(sb)); 3524 sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; 3525 sp = &sb; 3526 } 3527 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 3528} 3529 3530/* 3531 * Syscall to push extended attribute configuration information into the 3532 * VFS. Accepts a path, which it converts to a mountpoint, as well as 3533 * a command (int cmd), and attribute name and misc data. For now, the 3534 * attribute name is left in userspace for consumption by the VFS_op. 3535 * It will probably be changed to be copied into sysspace by the 3536 * syscall in the future, once issues with various consumers of the 3537 * attribute code have raised their hands. 3538 * 3539 * Currently this is used only by UFS Extended Attributes. 3540 */ 3541int 3542extattrctl(td, uap) 3543 struct thread *td; 3544 struct extattrctl_args /* { 3545 syscallarg(const char *) path; 3546 syscallarg(int) cmd; 3547 syscallarg(const char *) filename; 3548 syscallarg(int) attrnamespace; 3549 syscallarg(const char *) attrname; 3550 } */ *uap; 3551{ 3552 struct vnode *filename_vp; 3553 struct nameidata nd; 3554 struct mount *mp, *mp_writable; 3555 char attrname[EXTATTR_MAXNAMELEN]; 3556 int error; 3557 3558 /* 3559 * uap->attrname is not always defined. We check again later when we 3560 * invoke the VFS call so as to pass in NULL there if needed. 3561 */ 3562 if (uap->attrname != NULL) { 3563 error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, 3564 NULL); 3565 if (error) 3566 return (error); 3567 } 3568 3569 /* 3570 * uap->filename is not always defined. If it is, grab a vnode lock, 3571 * which VFS_EXTATTRCTL() will later release. 3572 */ 3573 filename_vp = NULL; 3574 if (uap->filename != NULL) { 3575 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 3576 uap->filename, td); 3577 if ((error = namei(&nd)) != 0) 3578 return (error); 3579 filename_vp = nd.ni_vp; 3580 NDFREE(&nd, NDF_NO_VP_RELE | NDF_NO_VP_UNLOCK); 3581 } 3582 3583 /* uap->path is always defined. */ 3584 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td); 3585 if ((error = namei(&nd)) != 0) { 3586 if (filename_vp != NULL) 3587 vput(filename_vp); 3588 return (error); 3589 } 3590 mp = nd.ni_vp->v_mount; 3591 error = vn_start_write(nd.ni_vp, &mp_writable, V_WAIT | PCATCH); 3592 NDFREE(&nd, 0); 3593 if (error) { 3594 if (filename_vp != NULL) 3595 vput(filename_vp); 3596 return (error); 3597 } 3598 3599 error = VFS_EXTATTRCTL(mp, uap->cmd, filename_vp, uap->attrnamespace, 3600 uap->attrname != NULL ? attrname : NULL, td); 3601 3602 vn_finished_write(mp_writable); 3603 /* 3604 * VFS_EXTATTRCTL will have unlocked, but not de-ref'd, 3605 * filename_vp, so vrele it if it is defined. 3606 */ 3607 if (filename_vp != NULL) 3608 vrele(filename_vp); 3609 3610 return (error); 3611} 3612 3613/*- 3614 * Set a named extended attribute on a file or directory 3615 * 3616 * Arguments: unlocked vnode "vp", attribute namespace "attrnamespace", 3617 * kernelspace string pointer "attrname", userspace buffer 3618 * pointer "data", buffer length "nbytes", thread "td". 3619 * Returns: 0 on success, an error number otherwise 3620 * Locks: none 3621 * References: vp must be a valid reference for the duration of the call 3622 */ 3623static int 3624extattr_set_vp(struct vnode *vp, int attrnamespace, const char *attrname, 3625 void *data, size_t nbytes, struct thread *td) 3626{ 3627 struct mount *mp; 3628 struct uio auio; 3629 struct iovec aiov; 3630 ssize_t cnt; 3631 int error; 3632 3633 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3634 return (error); 3635 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 3636 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3637 3638 aiov.iov_base = data; 3639 aiov.iov_len = nbytes; 3640 auio.uio_iov = &aiov; 3641 auio.uio_iovcnt = 1; 3642 auio.uio_offset = 0; 3643 if (nbytes > INT_MAX) { 3644 error = EINVAL; 3645 goto done; 3646 } 3647 auio.uio_resid = nbytes; 3648 auio.uio_rw = UIO_WRITE; 3649 auio.uio_segflg = UIO_USERSPACE; 3650 auio.uio_td = td; 3651 cnt = nbytes; 3652 3653#ifdef MAC 3654 error = mac_check_vnode_setextattr(td->td_ucred, vp, attrnamespace, 3655 attrname, &auio); 3656 if (error) 3657 goto done; 3658#endif 3659 3660 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, 3661 td->td_ucred, td); 3662 cnt -= auio.uio_resid; 3663 td->td_retval[0] = cnt; 3664 3665done: 3666 VOP_UNLOCK(vp, 0, td); 3667 vn_finished_write(mp); 3668 return (error); 3669} 3670 3671int 3672extattr_set_file(td, uap) 3673 struct thread *td; 3674 struct extattr_set_file_args /* { 3675 syscallarg(const char *) path; 3676 syscallarg(int) attrnamespace; 3677 syscallarg(const char *) attrname; 3678 syscallarg(void *) data; 3679 syscallarg(size_t) nbytes; 3680 } */ *uap; 3681{ 3682 struct nameidata nd; 3683 char attrname[EXTATTR_MAXNAMELEN]; 3684 int error; 3685 3686 error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL); 3687 if (error) 3688 return (error); 3689 3690 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td); 3691 if ((error = namei(&nd)) != 0) 3692 return (error); 3693 NDFREE(&nd, NDF_ONLY_PNBUF); 3694 3695 error = extattr_set_vp(nd.ni_vp, uap->attrnamespace, attrname, 3696 uap->data, uap->nbytes, td); 3697 3698 vrele(nd.ni_vp); 3699 return (error); 3700} 3701 3702int 3703extattr_set_fd(td, uap) 3704 struct thread *td; 3705 struct extattr_set_fd_args /* { 3706 syscallarg(int) fd; 3707 syscallarg(int) attrnamespace; 3708 syscallarg(const char *) attrname; 3709 syscallarg(void *) data; 3710 syscallarg(size_t) nbytes; 3711 } */ *uap; 3712{ 3713 struct file *fp; 3714 char attrname[EXTATTR_MAXNAMELEN]; 3715 int error; 3716 3717 error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL); 3718 if (error) 3719 return (error); 3720 3721 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) 3722 return (error); 3723 3724 error = extattr_set_vp((struct vnode *)fp->f_data, uap->attrnamespace, 3725 attrname, uap->data, uap->nbytes, td); 3726 fdrop(fp, td); 3727 3728 return (error); 3729} 3730 3731/*- 3732 * Get a named extended attribute on a file or directory 3733 * 3734 * Arguments: unlocked vnode "vp", attribute namespace "attrnamespace", 3735 * kernelspace string pointer "attrname", userspace buffer 3736 * pointer "data", buffer length "nbytes", thread "td". 3737 * Returns: 0 on success, an error number otherwise 3738 * Locks: none 3739 * References: vp must be a valid reference for the duration of the call 3740 */ 3741static int 3742extattr_get_vp(struct vnode *vp, int attrnamespace, const char *attrname, 3743 void *data, size_t nbytes, struct thread *td) 3744{ 3745 struct uio auio, *auiop; 3746 struct iovec aiov; 3747 ssize_t cnt; 3748 size_t size, *sizep; 3749 int error; 3750 3751 VOP_LEASE(vp, td, td->td_ucred, LEASE_READ); 3752 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3753 3754 /* 3755 * Slightly unusual semantics: if the user provides a NULL data 3756 * pointer, they don't want to receive the data, just the 3757 * maximum read length. 3758 */ 3759 auiop = NULL; 3760 sizep = NULL; 3761 cnt = 0; 3762 if (data != NULL) { 3763 aiov.iov_base = data; 3764 aiov.iov_len = nbytes; 3765 auio.uio_iov = &aiov; 3766 auio.uio_offset = 0; 3767 if (nbytes > INT_MAX) { 3768 error = EINVAL; 3769 goto done; 3770 } 3771 auio.uio_resid = nbytes; 3772 auio.uio_rw = UIO_READ; 3773 auio.uio_segflg = UIO_USERSPACE; 3774 auio.uio_td = td; 3775 auiop = &auio; 3776 cnt = nbytes; 3777 } else 3778 sizep = &size; 3779 3780#ifdef MAC 3781 error = mac_check_vnode_getextattr(td->td_ucred, vp, attrnamespace, 3782 attrname, &auio); 3783 if (error) 3784 goto done; 3785#endif 3786 3787 error = VOP_GETEXTATTR(vp, attrnamespace, attrname, auiop, sizep, 3788 td->td_ucred, td); 3789 3790 if (auiop != NULL) { 3791 cnt -= auio.uio_resid; 3792 td->td_retval[0] = cnt; 3793 } else 3794 td->td_retval[0] = size; 3795 3796done: 3797 VOP_UNLOCK(vp, 0, td); 3798 return (error); 3799} 3800 3801int 3802extattr_get_file(td, uap) 3803 struct thread *td; 3804 struct extattr_get_file_args /* { 3805 syscallarg(const char *) path; 3806 syscallarg(int) attrnamespace; 3807 syscallarg(const char *) attrname; 3808 syscallarg(void *) data; 3809 syscallarg(size_t) nbytes; 3810 } */ *uap; 3811{ 3812 struct nameidata nd; 3813 char attrname[EXTATTR_MAXNAMELEN]; 3814 int error; 3815 3816 error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL); 3817 if (error) 3818 return (error); 3819 3820 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td); 3821 if ((error = namei(&nd)) != 0) 3822 return (error); 3823 NDFREE(&nd, NDF_ONLY_PNBUF); 3824 3825 error = extattr_get_vp(nd.ni_vp, uap->attrnamespace, attrname, 3826 uap->data, uap->nbytes, td); 3827 3828 vrele(nd.ni_vp); 3829 return (error); 3830} 3831 3832int 3833extattr_get_fd(td, uap) 3834 struct thread *td; 3835 struct extattr_get_fd_args /* { 3836 syscallarg(int) fd; 3837 syscallarg(int) attrnamespace; 3838 syscallarg(const char *) attrname; 3839 syscallarg(void *) data; 3840 syscallarg(size_t) nbytes; 3841 } */ *uap; 3842{ 3843 struct file *fp; 3844 char attrname[EXTATTR_MAXNAMELEN]; 3845 int error; 3846 3847 error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL); 3848 if (error) 3849 return (error); 3850 3851 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) 3852 return (error); 3853 3854 error = extattr_get_vp((struct vnode *)fp->f_data, uap->attrnamespace, 3855 attrname, uap->data, uap->nbytes, td); 3856 3857 fdrop(fp, td); 3858 return (error); 3859} 3860 3861/* 3862 * extattr_delete_vp(): Delete a named extended attribute on a file or 3863 * directory 3864 * 3865 * Arguments: unlocked vnode "vp", attribute namespace "attrnamespace", 3866 * kernelspace string pointer "attrname", proc "p" 3867 * Returns: 0 on success, an error number otherwise 3868 * Locks: none 3869 * References: vp must be a valid reference for the duration of the call 3870 */ 3871static int 3872extattr_delete_vp(struct vnode *vp, int attrnamespace, const char *attrname, 3873 struct thread *td) 3874{ 3875 struct mount *mp; 3876 int error; 3877 3878 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3879 return (error); 3880 VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE); 3881 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 3882 3883#ifdef MAC 3884 error = mac_check_vnode_setextattr(td->td_ucred, vp, attrnamespace, 3885 attrname, NULL); 3886#endif 3887 3888 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, td->td_ucred, 3889 td); 3890 3891 VOP_UNLOCK(vp, 0, td); 3892 vn_finished_write(mp); 3893 return (error); 3894} 3895 3896int 3897extattr_delete_file(td, uap) 3898 struct thread *td; 3899 struct extattr_delete_file_args /* { 3900 syscallarg(const char *) path; 3901 syscallarg(int) attrnamespace; 3902 syscallarg(const char *) attrname; 3903 } */ *uap; 3904{ 3905 struct nameidata nd; 3906 char attrname[EXTATTR_MAXNAMELEN]; 3907 int error; 3908 3909 error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL); 3910 if (error) 3911 return(error); 3912 3913 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, td); 3914 if ((error = namei(&nd)) != 0) 3915 return(error); 3916 NDFREE(&nd, NDF_ONLY_PNBUF); 3917 3918 error = extattr_delete_vp(nd.ni_vp, uap->attrnamespace, attrname, td); 3919 3920 vrele(nd.ni_vp); 3921 return(error); 3922} 3923 3924int 3925extattr_delete_fd(td, uap) 3926 struct thread *td; 3927 struct extattr_delete_fd_args /* { 3928 syscallarg(int) fd; 3929 syscallarg(int) attrnamespace; 3930 syscallarg(const char *) attrname; 3931 } */ *uap; 3932{ 3933 struct file *fp; 3934 struct vnode *vp; 3935 char attrname[EXTATTR_MAXNAMELEN]; 3936 int error; 3937 3938 error = copyinstr(uap->attrname, attrname, EXTATTR_MAXNAMELEN, NULL); 3939 if (error) 3940 return (error); 3941 3942 if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) 3943 return (error); 3944 vp = (struct vnode *)fp->f_data; 3945 3946 error = extattr_delete_vp(vp, uap->attrnamespace, attrname, td); 3947 3948 fdrop(fp, td); 3949 return (error); 3950} 3951