vfs_syscalls.c revision 1.132
1 /* $NetBSD: vfs_syscalls.c,v 1.132 1999/03/24 05:51:26 mrg Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 41 */ 42 43 #include "opt_compat_netbsd.h" 44 #include "opt_compat_43.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/namei.h> 49 #include <sys/filedesc.h> 50 #include <sys/kernel.h> 51 #include <sys/file.h> 52 #include <sys/stat.h> 53 #include <sys/vnode.h> 54 #include <sys/mount.h> 55 #include <sys/proc.h> 56 #include <sys/uio.h> 57 #include <sys/malloc.h> 58 #include <sys/dirent.h> 59 60 #include <sys/syscallargs.h> 61 62 #include <vm/vm.h> 63 #include <sys/sysctl.h> 64 65 #include <uvm/uvm_extern.h> 66 67 static int change_dir __P((struct nameidata *, struct proc *)); 68 static int change_mode __P((struct vnode *, int, struct proc *p)); 69 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 70 int)); 71 static int change_utimes __P((struct vnode *vp, const struct timeval *, 72 struct proc *p)); 73 static int rename_files __P((const char *, const char *, struct proc *, int)); 74 75 void checkdirs __P((struct vnode *)); 76 int dounmount __P((struct mount *, int, struct proc *)); 77 78 /* 79 * Virtual File System System Calls 80 */ 81 82 /* 83 * Mount a file system. 84 */ 85 86 /* 87 * This table is used to maintain compatibility with 4.3BSD 88 * and NetBSD 0.9 mount syscalls. Note, the order is important! 89 * 90 * Also note that not all of these had actual numbers in 4.3BSD 91 * or NetBSD 0.9! 92 */ 93 const char *mountcompatnames[] = { 94 NULL, /* 0 = MOUNT_NONE */ 95 MOUNT_FFS, /* 1 */ 96 MOUNT_NFS, /* 2 */ 97 MOUNT_MFS, /* 3 */ 98 MOUNT_MSDOS, /* 4 */ 99 MOUNT_LFS, /* 5 */ 100 NULL, /* 6 = MOUNT_LOFS */ 101 MOUNT_FDESC, /* 7 */ 102 MOUNT_PORTAL, /* 8 */ 103 MOUNT_NULL, /* 9 */ 104 MOUNT_UMAP, /* 10 */ 105 MOUNT_KERNFS, /* 11 */ 106 MOUNT_PROCFS, /* 12 */ 107 MOUNT_AFS, /* 13 */ 108 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 109 MOUNT_UNION, /* 15 */ 110 MOUNT_ADOSFS, /* 16 */ 111 MOUNT_EXT2FS, /* 17 */ 112 MOUNT_CODA, /* 18 */ 113 MOUNT_FILECORE, /* 19 */ 114 }; 115 const int nmountcompatnames = sizeof(mountcompatnames) / 116 sizeof(mountcompatnames[0]); 117 118 /* ARGSUSED */ 119 int 120 sys_mount(p, v, retval) 121 struct proc *p; 122 void *v; 123 register_t *retval; 124 { 125 register struct sys_mount_args /* { 126 syscallarg(const char *) type; 127 syscallarg(const char *) path; 128 syscallarg(int) flags; 129 syscallarg(void *) data; 130 } */ *uap = v; 131 struct vnode *vp; 132 struct mount *mp; 133 int error, flag = 0; 134 char fstypename[MFSNAMELEN]; 135 struct vattr va; 136 struct nameidata nd; 137 struct vfsops *vfs; 138 139 /* 140 * Get vnode to be covered 141 */ 142 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 143 SCARG(uap, path), p); 144 if ((error = namei(&nd)) != 0) 145 return (error); 146 vp = nd.ni_vp; 147 /* 148 * A lookup in VFS_MOUNT might result in an attempt to 149 * lock this vnode again, so make the lock resursive. 150 */ 151 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 152 if (SCARG(uap, flags) & MNT_UPDATE) { 153 if ((vp->v_flag & VROOT) == 0) { 154 vput(vp); 155 return (EINVAL); 156 } 157 mp = vp->v_mount; 158 flag = mp->mnt_flag; 159 vfs = mp->mnt_op; 160 /* 161 * We only allow the filesystem to be reloaded if it 162 * is currently mounted read-only. 163 */ 164 if ((SCARG(uap, flags) & MNT_RELOAD) && 165 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 166 vput(vp); 167 return (EOPNOTSUPP); /* Needs translation */ 168 } 169 /* 170 * In "highly secure" mode, don't let the caller do anything 171 * but downgrade a filesystem from read-write to read-only. 172 * (see also below; MNT_UPDATE is required.) 173 */ 174 if (securelevel >= 2 && 175 (SCARG(uap, flags) != 176 (mp->mnt_flag | MNT_RDONLY | 177 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 178 vput(vp); 179 return (EPERM); 180 } 181 mp->mnt_flag |= 182 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 183 /* 184 * Only root, or the user that did the original mount is 185 * permitted to update it. 186 */ 187 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 188 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 189 vput(vp); 190 return (error); 191 } 192 /* 193 * Do not allow NFS export by non-root users. For non-root 194 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 195 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 196 */ 197 if (p->p_ucred->cr_uid != 0) { 198 if (SCARG(uap, flags) & MNT_EXPORTED) { 199 vput(vp); 200 return (EPERM); 201 } 202 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 203 if (flag & MNT_NOEXEC) 204 SCARG(uap, flags) |= MNT_NOEXEC; 205 } 206 if (vfs_busy(mp, LK_NOWAIT, 0)) { 207 vput(vp); 208 return (EPERM); 209 } 210 VOP_UNLOCK(vp, 0); 211 goto update; 212 } else { 213 if (securelevel >= 2) 214 return (EPERM); 215 } 216 /* 217 * If the user is not root, ensure that they own the directory 218 * onto which we are attempting to mount. 219 */ 220 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 221 (va.va_uid != p->p_ucred->cr_uid && 222 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 223 vput(vp); 224 return (error); 225 } 226 /* 227 * Do not allow NFS export by non-root users. For non-root users, 228 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 229 * mount point is already MNT_NOEXEC. 230 */ 231 if (p->p_ucred->cr_uid != 0) { 232 if (SCARG(uap, flags) & MNT_EXPORTED) { 233 vput(vp); 234 return (EPERM); 235 } 236 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 237 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 238 SCARG(uap, flags) |= MNT_NOEXEC; 239 } 240 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 241 return (error); 242 if (vp->v_type != VDIR) { 243 vput(vp); 244 return (ENOTDIR); 245 } 246 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 247 if (error) { 248 #if defined(COMPAT_09) || defined(COMPAT_43) 249 /* 250 * Historically filesystem types were identified by number. 251 * If we get an integer for the filesystem type instead of a 252 * string, we check to see if it matches one of the historic 253 * filesystem types. 254 */ 255 u_long fsindex = (u_long)SCARG(uap, type); 256 if (fsindex >= nmountcompatnames || 257 mountcompatnames[fsindex] == NULL) { 258 vput(vp); 259 return (ENODEV); 260 } 261 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 262 #else 263 vput(vp); 264 return (error); 265 #endif 266 } 267 #ifdef COMPAT_10 268 /* Accept `ufs' as an alias for `ffs'. */ 269 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 270 strncpy(fstypename, "ffs", MFSNAMELEN); 271 #endif 272 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 273 vput(vp); 274 return (ENODEV); 275 } 276 if (vp->v_mountedhere != NULL) { 277 vput(vp); 278 return (EBUSY); 279 } 280 281 /* 282 * Allocate and initialize the file system. 283 */ 284 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 285 M_MOUNT, M_WAITOK); 286 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 287 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 288 (void)vfs_busy(mp, LK_NOWAIT, 0); 289 mp->mnt_op = vfs; 290 vfs->vfs_refcount++; 291 mp->mnt_vnodecovered = vp; 292 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 293 update: 294 /* 295 * Set the mount level flags. 296 */ 297 if (SCARG(uap, flags) & MNT_RDONLY) 298 mp->mnt_flag |= MNT_RDONLY; 299 else if (mp->mnt_flag & MNT_RDONLY) 300 mp->mnt_flag |= MNT_WANTRDWR; 301 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 302 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 303 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 304 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 305 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 306 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 307 /* 308 * Mount the filesystem. 309 */ 310 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 311 if (mp->mnt_flag & MNT_UPDATE) { 312 vrele(vp); 313 if (mp->mnt_flag & MNT_WANTRDWR) 314 mp->mnt_flag &= ~MNT_RDONLY; 315 mp->mnt_flag &=~ 316 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 317 if (error) 318 mp->mnt_flag = flag; 319 vfs_unbusy(mp); 320 return (error); 321 } 322 /* 323 * Put the new filesystem on the mount list after root. 324 */ 325 cache_purge(vp); 326 if (!error) { 327 vp->v_mountedhere = mp; 328 simple_lock(&mountlist_slock); 329 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 330 simple_unlock(&mountlist_slock); 331 checkdirs(vp); 332 VOP_UNLOCK(vp, 0); 333 vfs_unbusy(mp); 334 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 335 if ((error = VFS_START(mp, 0, p))) 336 vrele(vp); 337 } else { 338 vp->v_mountedhere = (struct mount *)0; 339 vfs->vfs_refcount--; 340 vfs_unbusy(mp); 341 free((caddr_t)mp, M_MOUNT); 342 vput(vp); 343 } 344 return (error); 345 } 346 347 /* 348 * Scan all active processes to see if any of them have a current 349 * or root directory onto which the new filesystem has just been 350 * mounted. If so, replace them with the new mount point. 351 */ 352 void 353 checkdirs(olddp) 354 struct vnode *olddp; 355 { 356 struct filedesc *fdp; 357 struct vnode *newdp; 358 struct proc *p; 359 360 if (olddp->v_usecount == 1) 361 return; 362 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 363 panic("mount: lost mount"); 364 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 365 fdp = p->p_fd; 366 if (fdp->fd_cdir == olddp) { 367 vrele(fdp->fd_cdir); 368 VREF(newdp); 369 fdp->fd_cdir = newdp; 370 } 371 if (fdp->fd_rdir == olddp) { 372 vrele(fdp->fd_rdir); 373 VREF(newdp); 374 fdp->fd_rdir = newdp; 375 } 376 } 377 if (rootvnode == olddp) { 378 vrele(rootvnode); 379 VREF(newdp); 380 rootvnode = newdp; 381 } 382 vput(newdp); 383 } 384 385 /* 386 * Unmount a file system. 387 * 388 * Note: unmount takes a path to the vnode mounted on as argument, 389 * not special file (as before). 390 */ 391 /* ARGSUSED */ 392 int 393 sys_unmount(p, v, retval) 394 struct proc *p; 395 void *v; 396 register_t *retval; 397 { 398 register struct sys_unmount_args /* { 399 syscallarg(const char *) path; 400 syscallarg(int) flags; 401 } */ *uap = v; 402 register struct vnode *vp; 403 struct mount *mp; 404 int error; 405 struct nameidata nd; 406 407 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 408 SCARG(uap, path), p); 409 if ((error = namei(&nd)) != 0) 410 return (error); 411 vp = nd.ni_vp; 412 mp = vp->v_mount; 413 414 /* 415 * Only root, or the user that did the original mount is 416 * permitted to unmount this filesystem. 417 */ 418 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 419 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 420 vput(vp); 421 return (error); 422 } 423 424 /* 425 * Don't allow unmounting the root file system. 426 */ 427 if (mp->mnt_flag & MNT_ROOTFS) { 428 vput(vp); 429 return (EINVAL); 430 } 431 432 /* 433 * Must be the root of the filesystem 434 */ 435 if ((vp->v_flag & VROOT) == 0) { 436 vput(vp); 437 return (EINVAL); 438 } 439 vput(vp); 440 441 if (vfs_busy(mp, 0, 0)) 442 return (EBUSY); 443 444 return (dounmount(mp, SCARG(uap, flags), p)); 445 } 446 447 /* 448 * Do the actual file system unmount. File system is assumed to have been 449 * marked busy by the caller. 450 */ 451 int 452 dounmount(mp, flags, p) 453 register struct mount *mp; 454 int flags; 455 struct proc *p; 456 { 457 struct vnode *coveredvp; 458 int error; 459 460 simple_lock(&mountlist_slock); 461 mp->mnt_flag |= MNT_UNMOUNT; 462 vfs_unbusy(mp); 463 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 464 if (mp->mnt_flag & MNT_EXPUBLIC) 465 vfs_setpublicfs(NULL, NULL, NULL); 466 mp->mnt_flag &=~ MNT_ASYNC; 467 cache_purgevfs(mp); /* remove cache entries for this file sys */ 468 if (((mp->mnt_flag & MNT_RDONLY) || 469 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 470 (flags & MNT_FORCE)) 471 error = VFS_UNMOUNT(mp, flags, p); 472 simple_lock(&mountlist_slock); 473 if (error) { 474 mp->mnt_flag &= ~MNT_UNMOUNT; 475 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 476 &mountlist_slock); 477 if (mp->mnt_flag & MNT_MWAIT) 478 wakeup((caddr_t)mp); 479 return (error); 480 } 481 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 482 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 483 coveredvp->v_mountedhere = NULL; 484 vrele(coveredvp); 485 } 486 mp->mnt_op->vfs_refcount--; 487 if (mp->mnt_vnodelist.lh_first != NULL) 488 panic("unmount: dangling vnode"); 489 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 490 if (mp->mnt_flag & MNT_MWAIT) 491 wakeup((caddr_t)mp); 492 free((caddr_t)mp, M_MOUNT); 493 return (0); 494 } 495 496 /* 497 * Sync each mounted filesystem. 498 */ 499 #ifdef DEBUG 500 int syncprt = 0; 501 struct ctldebug debug0 = { "syncprt", &syncprt }; 502 #endif 503 504 /* ARGSUSED */ 505 int 506 sys_sync(p, v, retval) 507 struct proc *p; 508 void *v; 509 register_t *retval; 510 { 511 register struct mount *mp, *nmp; 512 int asyncflag; 513 514 simple_lock(&mountlist_slock); 515 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 516 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 517 nmp = mp->mnt_list.cqe_prev; 518 continue; 519 } 520 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 521 asyncflag = mp->mnt_flag & MNT_ASYNC; 522 mp->mnt_flag &= ~MNT_ASYNC; 523 uvm_vnp_sync(mp); 524 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 525 if (asyncflag) 526 mp->mnt_flag |= MNT_ASYNC; 527 } 528 simple_lock(&mountlist_slock); 529 nmp = mp->mnt_list.cqe_prev; 530 vfs_unbusy(mp); 531 532 } 533 simple_unlock(&mountlist_slock); 534 #ifdef DEBUG 535 if (syncprt) 536 vfs_bufstats(); 537 #endif /* DEBUG */ 538 return (0); 539 } 540 541 /* 542 * Change filesystem quotas. 543 */ 544 /* ARGSUSED */ 545 int 546 sys_quotactl(p, v, retval) 547 struct proc *p; 548 void *v; 549 register_t *retval; 550 { 551 register struct sys_quotactl_args /* { 552 syscallarg(const char *) path; 553 syscallarg(int) cmd; 554 syscallarg(int) uid; 555 syscallarg(caddr_t) arg; 556 } */ *uap = v; 557 register struct mount *mp; 558 int error; 559 struct nameidata nd; 560 561 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 562 if ((error = namei(&nd)) != 0) 563 return (error); 564 mp = nd.ni_vp->v_mount; 565 vrele(nd.ni_vp); 566 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 567 SCARG(uap, arg), p)); 568 } 569 570 /* 571 * Get filesystem statistics. 572 */ 573 /* ARGSUSED */ 574 int 575 sys_statfs(p, v, retval) 576 struct proc *p; 577 void *v; 578 register_t *retval; 579 { 580 register struct sys_statfs_args /* { 581 syscallarg(const char *) path; 582 syscallarg(struct statfs *) buf; 583 } */ *uap = v; 584 register struct mount *mp; 585 register struct statfs *sp; 586 int error; 587 struct nameidata nd; 588 589 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 590 if ((error = namei(&nd)) != 0) 591 return (error); 592 mp = nd.ni_vp->v_mount; 593 sp = &mp->mnt_stat; 594 vrele(nd.ni_vp); 595 if ((error = VFS_STATFS(mp, sp, p)) != 0) 596 return (error); 597 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 598 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 599 } 600 601 /* 602 * Get filesystem statistics. 603 */ 604 /* ARGSUSED */ 605 int 606 sys_fstatfs(p, v, retval) 607 struct proc *p; 608 void *v; 609 register_t *retval; 610 { 611 register struct sys_fstatfs_args /* { 612 syscallarg(int) fd; 613 syscallarg(struct statfs *) buf; 614 } */ *uap = v; 615 struct file *fp; 616 struct mount *mp; 617 register struct statfs *sp; 618 int error; 619 620 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 621 return (error); 622 mp = ((struct vnode *)fp->f_data)->v_mount; 623 sp = &mp->mnt_stat; 624 if ((error = VFS_STATFS(mp, sp, p)) != 0) 625 return (error); 626 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 627 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 628 } 629 630 /* 631 * Get statistics on all filesystems. 632 */ 633 int 634 sys_getfsstat(p, v, retval) 635 struct proc *p; 636 void *v; 637 register_t *retval; 638 { 639 register struct sys_getfsstat_args /* { 640 syscallarg(struct statfs *) buf; 641 syscallarg(long) bufsize; 642 syscallarg(int) flags; 643 } */ *uap = v; 644 register struct mount *mp, *nmp; 645 register struct statfs *sp; 646 caddr_t sfsp; 647 long count, maxcount, error; 648 649 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 650 sfsp = (caddr_t)SCARG(uap, buf); 651 simple_lock(&mountlist_slock); 652 count = 0; 653 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 654 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 655 nmp = mp->mnt_list.cqe_next; 656 continue; 657 } 658 if (sfsp && count < maxcount) { 659 sp = &mp->mnt_stat; 660 /* 661 * If MNT_NOWAIT is specified, do not refresh the 662 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 663 */ 664 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 665 (SCARG(uap, flags) & MNT_WAIT)) && 666 (error = VFS_STATFS(mp, sp, p)) != 0) { 667 simple_lock(&mountlist_slock); 668 nmp = mp->mnt_list.cqe_next; 669 vfs_unbusy(mp); 670 continue; 671 } 672 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 673 error = copyout(sp, sfsp, sizeof(*sp)); 674 if (error) 675 return (error); 676 sfsp += sizeof(*sp); 677 } 678 count++; 679 simple_lock(&mountlist_slock); 680 nmp = mp->mnt_list.cqe_next; 681 vfs_unbusy(mp); 682 } 683 simple_unlock(&mountlist_slock); 684 if (sfsp && count > maxcount) 685 *retval = maxcount; 686 else 687 *retval = count; 688 return (0); 689 } 690 691 /* 692 * Change current working directory to a given file descriptor. 693 */ 694 /* ARGSUSED */ 695 int 696 sys_fchdir(p, v, retval) 697 struct proc *p; 698 void *v; 699 register_t *retval; 700 { 701 struct sys_fchdir_args /* { 702 syscallarg(int) fd; 703 } */ *uap = v; 704 register struct filedesc *fdp = p->p_fd; 705 struct vnode *vp, *tdp; 706 struct mount *mp; 707 struct file *fp; 708 int error; 709 710 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 711 return (error); 712 vp = (struct vnode *)fp->f_data; 713 714 VREF(vp); 715 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 716 if (vp->v_type != VDIR) 717 error = ENOTDIR; 718 else 719 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 720 while (!error && (mp = vp->v_mountedhere) != NULL) { 721 if (vfs_busy(mp, 0, 0)) 722 continue; 723 error = VFS_ROOT(mp, &tdp); 724 vfs_unbusy(mp); 725 if (error) 726 break; 727 vput(vp); 728 vp = tdp; 729 } 730 if (error) { 731 vput(vp); 732 return (error); 733 } 734 VOP_UNLOCK(vp, 0); 735 736 /* 737 * Disallow changing to a directory not under the process's 738 * current root directory (if there is one). 739 */ 740 if (fdp->fd_rdir && 741 !vn_isunder(vp, NULL, p)) { 742 vrele(vp); 743 return EPERM; /* operation not permitted */ 744 } 745 746 vrele(fdp->fd_cdir); 747 fdp->fd_cdir = vp; 748 return (0); 749 } 750 751 /* 752 * Change this process's notion of the root directory to a given file descriptor. 753 */ 754 755 int 756 sys_fchroot(p, v, retval) 757 struct proc *p; 758 void *v; 759 register_t *retval; 760 { 761 struct sys_fchroot_args *uap = v; 762 struct filedesc *fdp = p->p_fd; 763 struct vnode *vp; 764 struct file *fp; 765 int error; 766 767 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 768 return error; 769 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 770 return error; 771 vp = (struct vnode *) fp->f_data; 772 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 773 if (vp->v_type != VDIR) 774 error = ENOTDIR; 775 else 776 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 777 VOP_UNLOCK(vp, 0); 778 if (error) 779 return error; 780 VREF(vp); 781 782 /* 783 * Prevent escaping from chroot by putting the root under 784 * the working directory. Silently chdir to / if we aren't 785 * already there. 786 */ 787 if (!vn_isunder(fdp->fd_cdir, vp, p)) { 788 /* 789 * XXX would be more failsafe to change directory to a 790 * deadfs node here instead 791 */ 792 vrele(fdp->fd_cdir); 793 VREF(vp); 794 fdp->fd_cdir = vp; 795 } 796 797 if (fdp->fd_rdir != NULL) 798 vrele(fdp->fd_rdir); 799 fdp->fd_rdir = vp; 800 return 0; 801 } 802 803 804 805 /* 806 * Change current working directory (``.''). 807 */ 808 /* ARGSUSED */ 809 int 810 sys_chdir(p, v, retval) 811 struct proc *p; 812 void *v; 813 register_t *retval; 814 { 815 struct sys_chdir_args /* { 816 syscallarg(const char *) path; 817 } */ *uap = v; 818 register struct filedesc *fdp = p->p_fd; 819 int error; 820 struct nameidata nd; 821 822 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 823 SCARG(uap, path), p); 824 if ((error = change_dir(&nd, p)) != 0) 825 return (error); 826 vrele(fdp->fd_cdir); 827 fdp->fd_cdir = nd.ni_vp; 828 return (0); 829 } 830 831 /* 832 * Change notion of root (``/'') directory. 833 */ 834 /* ARGSUSED */ 835 int 836 sys_chroot(p, v, retval) 837 struct proc *p; 838 void *v; 839 register_t *retval; 840 { 841 struct sys_chroot_args /* { 842 syscallarg(const char *) path; 843 } */ *uap = v; 844 register struct filedesc *fdp = p->p_fd; 845 struct vnode *vp; 846 int error; 847 struct nameidata nd; 848 849 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 850 return (error); 851 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 852 SCARG(uap, path), p); 853 if ((error = change_dir(&nd, p)) != 0) 854 return (error); 855 if (fdp->fd_rdir != NULL) 856 vrele(fdp->fd_rdir); 857 vp = nd.ni_vp; 858 fdp->fd_rdir = vp; 859 860 /* 861 * Prevent escaping from chroot by putting the root under 862 * the working directory. Silently chdir to / if we aren't 863 * already there. 864 */ 865 if (!vn_isunder(fdp->fd_cdir, vp, p)) { 866 /* 867 * XXX would be more failsafe to change directory to a 868 * deadfs node here instead 869 */ 870 vrele(fdp->fd_cdir); 871 VREF(vp); 872 fdp->fd_cdir = vp; 873 } 874 875 return (0); 876 } 877 878 /* 879 * Common routine for chroot and chdir. 880 */ 881 static int 882 change_dir(ndp, p) 883 register struct nameidata *ndp; 884 struct proc *p; 885 { 886 struct vnode *vp; 887 int error; 888 889 if ((error = namei(ndp)) != 0) 890 return (error); 891 vp = ndp->ni_vp; 892 if (vp->v_type != VDIR) 893 error = ENOTDIR; 894 else 895 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 896 897 if (error) 898 vput(vp); 899 else 900 VOP_UNLOCK(vp, 0); 901 return (error); 902 } 903 904 /* 905 * Check permissions, allocate an open file structure, 906 * and call the device open routine if any. 907 */ 908 int 909 sys_open(p, v, retval) 910 struct proc *p; 911 void *v; 912 register_t *retval; 913 { 914 register struct sys_open_args /* { 915 syscallarg(const char *) path; 916 syscallarg(int) flags; 917 syscallarg(int) mode; 918 } */ *uap = v; 919 register struct filedesc *fdp = p->p_fd; 920 register struct file *fp; 921 register struct vnode *vp; 922 int flags, cmode; 923 struct file *nfp; 924 int type, indx, error; 925 struct flock lf; 926 struct nameidata nd; 927 extern struct fileops vnops; 928 929 flags = FFLAGS(SCARG(uap, flags)); 930 if ((flags & (FREAD | FWRITE)) == 0) 931 return (EINVAL); 932 if ((error = falloc(p, &nfp, &indx)) != 0) 933 return (error); 934 fp = nfp; 935 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 936 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 937 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 938 if ((error = vn_open(&nd, flags, cmode)) != 0) { 939 ffree(fp); 940 if ((error == ENODEV || error == ENXIO) && 941 p->p_dupfd >= 0 && /* XXX from fdopen */ 942 (error = 943 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 944 *retval = indx; 945 return (0); 946 } 947 if (error == ERESTART) 948 error = EINTR; 949 fdp->fd_ofiles[indx] = NULL; 950 return (error); 951 } 952 p->p_dupfd = 0; 953 vp = nd.ni_vp; 954 fp->f_flag = flags & FMASK; 955 fp->f_type = DTYPE_VNODE; 956 fp->f_ops = &vnops; 957 fp->f_data = (caddr_t)vp; 958 if (flags & (O_EXLOCK | O_SHLOCK)) { 959 lf.l_whence = SEEK_SET; 960 lf.l_start = 0; 961 lf.l_len = 0; 962 if (flags & O_EXLOCK) 963 lf.l_type = F_WRLCK; 964 else 965 lf.l_type = F_RDLCK; 966 type = F_FLOCK; 967 if ((flags & FNONBLOCK) == 0) 968 type |= F_WAIT; 969 VOP_UNLOCK(vp, 0); 970 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 971 if (error) { 972 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 973 ffree(fp); 974 fdp->fd_ofiles[indx] = NULL; 975 return (error); 976 } 977 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 978 fp->f_flag |= FHASLOCK; 979 } 980 VOP_UNLOCK(vp, 0); 981 *retval = indx; 982 return (0); 983 } 984 985 /* 986 * Create a special file. 987 */ 988 /* ARGSUSED */ 989 int 990 sys_mknod(p, v, retval) 991 struct proc *p; 992 void *v; 993 register_t *retval; 994 { 995 register struct sys_mknod_args /* { 996 syscallarg(const char *) path; 997 syscallarg(int) mode; 998 syscallarg(int) dev; 999 } */ *uap = v; 1000 register struct vnode *vp; 1001 struct vattr vattr; 1002 int error; 1003 int whiteout = 0; 1004 struct nameidata nd; 1005 1006 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1007 return (error); 1008 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1009 if ((error = namei(&nd)) != 0) 1010 return (error); 1011 vp = nd.ni_vp; 1012 if (vp != NULL) 1013 error = EEXIST; 1014 else { 1015 VATTR_NULL(&vattr); 1016 vattr.va_mode = 1017 (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 1018 vattr.va_rdev = SCARG(uap, dev); 1019 whiteout = 0; 1020 1021 switch (SCARG(uap, mode) & S_IFMT) { 1022 case S_IFMT: /* used by badsect to flag bad sectors */ 1023 vattr.va_type = VBAD; 1024 break; 1025 case S_IFCHR: 1026 vattr.va_type = VCHR; 1027 break; 1028 case S_IFBLK: 1029 vattr.va_type = VBLK; 1030 break; 1031 case S_IFWHT: 1032 whiteout = 1; 1033 break; 1034 default: 1035 error = EINVAL; 1036 break; 1037 } 1038 } 1039 if (!error) { 1040 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1041 if (whiteout) { 1042 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1043 if (error) 1044 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1045 vput(nd.ni_dvp); 1046 } else { 1047 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1048 &nd.ni_cnd, &vattr); 1049 } 1050 } else { 1051 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1052 if (nd.ni_dvp == vp) 1053 vrele(nd.ni_dvp); 1054 else 1055 vput(nd.ni_dvp); 1056 if (vp) 1057 vrele(vp); 1058 } 1059 return (error); 1060 } 1061 1062 /* 1063 * Create a named pipe. 1064 */ 1065 /* ARGSUSED */ 1066 int 1067 sys_mkfifo(p, v, retval) 1068 struct proc *p; 1069 void *v; 1070 register_t *retval; 1071 { 1072 register struct sys_mkfifo_args /* { 1073 syscallarg(const char *) path; 1074 syscallarg(int) mode; 1075 } */ *uap = v; 1076 struct vattr vattr; 1077 int error; 1078 struct nameidata nd; 1079 1080 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1081 if ((error = namei(&nd)) != 0) 1082 return (error); 1083 if (nd.ni_vp != NULL) { 1084 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1085 if (nd.ni_dvp == nd.ni_vp) 1086 vrele(nd.ni_dvp); 1087 else 1088 vput(nd.ni_dvp); 1089 vrele(nd.ni_vp); 1090 return (EEXIST); 1091 } 1092 VATTR_NULL(&vattr); 1093 vattr.va_type = VFIFO; 1094 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 1095 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1096 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1097 } 1098 1099 /* 1100 * Make a hard file link. 1101 */ 1102 /* ARGSUSED */ 1103 int 1104 sys_link(p, v, retval) 1105 struct proc *p; 1106 void *v; 1107 register_t *retval; 1108 { 1109 register struct sys_link_args /* { 1110 syscallarg(const char *) path; 1111 syscallarg(const char *) link; 1112 } */ *uap = v; 1113 register struct vnode *vp; 1114 struct nameidata nd; 1115 int error; 1116 1117 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1118 if ((error = namei(&nd)) != 0) 1119 return (error); 1120 vp = nd.ni_vp; 1121 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1122 if ((error = namei(&nd)) != 0) 1123 goto out; 1124 if (nd.ni_vp) { 1125 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1126 if (nd.ni_dvp == nd.ni_vp) 1127 vrele(nd.ni_dvp); 1128 else 1129 vput(nd.ni_dvp); 1130 vrele(nd.ni_vp); 1131 error = EEXIST; 1132 goto out; 1133 } 1134 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1135 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1136 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1137 out: 1138 vrele(vp); 1139 return (error); 1140 } 1141 1142 /* 1143 * Make a symbolic link. 1144 */ 1145 /* ARGSUSED */ 1146 int 1147 sys_symlink(p, v, retval) 1148 struct proc *p; 1149 void *v; 1150 register_t *retval; 1151 { 1152 register struct sys_symlink_args /* { 1153 syscallarg(const char *) path; 1154 syscallarg(const char *) link; 1155 } */ *uap = v; 1156 struct vattr vattr; 1157 char *path; 1158 int error; 1159 struct nameidata nd; 1160 1161 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1162 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1163 if (error) 1164 goto out; 1165 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1166 if ((error = namei(&nd)) != 0) 1167 goto out; 1168 if (nd.ni_vp) { 1169 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1170 if (nd.ni_dvp == nd.ni_vp) 1171 vrele(nd.ni_dvp); 1172 else 1173 vput(nd.ni_dvp); 1174 vrele(nd.ni_vp); 1175 error = EEXIST; 1176 goto out; 1177 } 1178 VATTR_NULL(&vattr); 1179 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1180 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1181 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1182 out: 1183 FREE(path, M_NAMEI); 1184 return (error); 1185 } 1186 1187 /* 1188 * Delete a whiteout from the filesystem. 1189 */ 1190 /* ARGSUSED */ 1191 int 1192 sys_undelete(p, v, retval) 1193 struct proc *p; 1194 void *v; 1195 register_t *retval; 1196 { 1197 register struct sys_undelete_args /* { 1198 syscallarg(const char *) path; 1199 } */ *uap = v; 1200 int error; 1201 struct nameidata nd; 1202 1203 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1204 SCARG(uap, path), p); 1205 error = namei(&nd); 1206 if (error) 1207 return (error); 1208 1209 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1210 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1211 if (nd.ni_dvp == nd.ni_vp) 1212 vrele(nd.ni_dvp); 1213 else 1214 vput(nd.ni_dvp); 1215 if (nd.ni_vp) 1216 vrele(nd.ni_vp); 1217 return (EEXIST); 1218 } 1219 1220 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1221 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1222 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1223 vput(nd.ni_dvp); 1224 return (error); 1225 } 1226 1227 /* 1228 * Delete a name from the filesystem. 1229 */ 1230 /* ARGSUSED */ 1231 int 1232 sys_unlink(p, v, retval) 1233 struct proc *p; 1234 void *v; 1235 register_t *retval; 1236 { 1237 struct sys_unlink_args /* { 1238 syscallarg(const char *) path; 1239 } */ *uap = v; 1240 register struct vnode *vp; 1241 int error; 1242 struct nameidata nd; 1243 1244 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1245 SCARG(uap, path), p); 1246 if ((error = namei(&nd)) != 0) 1247 return (error); 1248 vp = nd.ni_vp; 1249 1250 /* 1251 * The root of a mounted filesystem cannot be deleted. 1252 */ 1253 if (vp->v_flag & VROOT) { 1254 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1255 if (nd.ni_dvp == vp) 1256 vrele(nd.ni_dvp); 1257 else 1258 vput(nd.ni_dvp); 1259 vput(vp); 1260 error = EBUSY; 1261 goto out; 1262 } 1263 1264 (void)uvm_vnp_uncache(vp); 1265 1266 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1267 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1268 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1269 out: 1270 return (error); 1271 } 1272 1273 /* 1274 * Reposition read/write file offset. 1275 */ 1276 int 1277 sys_lseek(p, v, retval) 1278 struct proc *p; 1279 void *v; 1280 register_t *retval; 1281 { 1282 register struct sys_lseek_args /* { 1283 syscallarg(int) fd; 1284 syscallarg(int) pad; 1285 syscallarg(off_t) offset; 1286 syscallarg(int) whence; 1287 } */ *uap = v; 1288 struct ucred *cred = p->p_ucred; 1289 register struct filedesc *fdp = p->p_fd; 1290 register struct file *fp; 1291 struct vnode *vp; 1292 struct vattr vattr; 1293 register off_t newoff; 1294 int error; 1295 1296 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1297 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1298 return (EBADF); 1299 1300 vp = (struct vnode *)fp->f_data; 1301 if (fp->f_type != DTYPE_VNODE 1302 || vp->v_type == VFIFO) 1303 return (ESPIPE); 1304 1305 switch (SCARG(uap, whence)) { 1306 case SEEK_CUR: 1307 newoff = fp->f_offset + SCARG(uap, offset); 1308 break; 1309 case SEEK_END: 1310 error = VOP_GETATTR(vp, &vattr, cred, p); 1311 if (error) 1312 return (error); 1313 newoff = SCARG(uap, offset) + vattr.va_size; 1314 break; 1315 case SEEK_SET: 1316 newoff = SCARG(uap, offset); 1317 break; 1318 default: 1319 return (EINVAL); 1320 } 1321 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1322 return (error); 1323 1324 *(off_t *)retval = fp->f_offset = newoff; 1325 return (0); 1326 } 1327 1328 /* 1329 * Positional read system call. 1330 */ 1331 int 1332 sys_pread(p, v, retval) 1333 struct proc *p; 1334 void *v; 1335 register_t *retval; 1336 { 1337 struct sys_pread_args /* { 1338 syscallarg(int) fd; 1339 syscallarg(void *) buf; 1340 syscallarg(size_t) nbyte; 1341 syscallarg(off_t) offset; 1342 } */ *uap = v; 1343 struct filedesc *fdp = p->p_fd; 1344 struct file *fp; 1345 struct vnode *vp; 1346 off_t offset; 1347 int error, fd = SCARG(uap, fd); 1348 1349 if ((u_int)fd >= fdp->fd_nfiles || 1350 (fp = fdp->fd_ofiles[fd]) == NULL || 1351 (fp->f_flag & FREAD) == 0) 1352 return (EBADF); 1353 1354 vp = (struct vnode *)fp->f_data; 1355 if (fp->f_type != DTYPE_VNODE 1356 || vp->v_type == VFIFO) 1357 return (ESPIPE); 1358 1359 offset = SCARG(uap, offset); 1360 1361 /* 1362 * XXX This works because no file systems actually 1363 * XXX take any action on the seek operation. 1364 */ 1365 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1366 return (error); 1367 1368 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1369 &offset, 0, retval)); 1370 } 1371 1372 /* 1373 * Positional scatter read system call. 1374 */ 1375 int 1376 sys_preadv(p, v, retval) 1377 struct proc *p; 1378 void *v; 1379 register_t *retval; 1380 { 1381 struct sys_preadv_args /* { 1382 syscallarg(int) fd; 1383 syscallarg(const struct iovec *) iovp; 1384 syscallarg(int) iovcnt; 1385 syscallarg(off_t) offset; 1386 } */ *uap = v; 1387 struct filedesc *fdp = p->p_fd; 1388 struct file *fp; 1389 struct vnode *vp; 1390 off_t offset; 1391 int error, fd = SCARG(uap, fd); 1392 1393 if ((u_int)fd >= fdp->fd_nfiles || 1394 (fp = fdp->fd_ofiles[fd]) == NULL || 1395 (fp->f_flag & FREAD) == 0) 1396 return (EBADF); 1397 1398 vp = (struct vnode *)fp->f_data; 1399 if (fp->f_type != DTYPE_VNODE 1400 || vp->v_type == VFIFO) 1401 return (ESPIPE); 1402 1403 offset = SCARG(uap, offset); 1404 1405 /* 1406 * XXX This works because no file systems actually 1407 * XXX take any action on the seek operation. 1408 */ 1409 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1410 return (error); 1411 1412 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1413 &offset, 0, retval)); 1414 } 1415 1416 /* 1417 * Positional write system call. 1418 */ 1419 int 1420 sys_pwrite(p, v, retval) 1421 struct proc *p; 1422 void *v; 1423 register_t *retval; 1424 { 1425 struct sys_pwrite_args /* { 1426 syscallarg(int) fd; 1427 syscallarg(const void *) buf; 1428 syscallarg(size_t) nbyte; 1429 syscallarg(off_t) offset; 1430 } */ *uap = v; 1431 struct filedesc *fdp = p->p_fd; 1432 struct file *fp; 1433 struct vnode *vp; 1434 off_t offset; 1435 int error, fd = SCARG(uap, fd); 1436 1437 if ((u_int)fd >= fdp->fd_nfiles || 1438 (fp = fdp->fd_ofiles[fd]) == NULL || 1439 (fp->f_flag & FWRITE) == 0) 1440 return (EBADF); 1441 1442 vp = (struct vnode *)fp->f_data; 1443 if (fp->f_type != DTYPE_VNODE 1444 || vp->v_type == VFIFO) 1445 return (ESPIPE); 1446 1447 offset = SCARG(uap, offset); 1448 1449 /* 1450 * XXX This works because no file systems actually 1451 * XXX take any action on the seek operation. 1452 */ 1453 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1454 return (error); 1455 1456 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1457 &offset, 0, retval)); 1458 } 1459 1460 /* 1461 * Positional gather write system call. 1462 */ 1463 int 1464 sys_pwritev(p, v, retval) 1465 struct proc *p; 1466 void *v; 1467 register_t *retval; 1468 { 1469 struct sys_pwritev_args /* { 1470 syscallarg(int) fd; 1471 syscallarg(const struct iovec *) iovp; 1472 syscallarg(int) iovcnt; 1473 syscallarg(off_t) offset; 1474 } */ *uap = v; 1475 struct filedesc *fdp = p->p_fd; 1476 struct file *fp; 1477 struct vnode *vp; 1478 off_t offset; 1479 int error, fd = SCARG(uap, fd); 1480 1481 if ((u_int)fd >= fdp->fd_nfiles || 1482 (fp = fdp->fd_ofiles[fd]) == NULL || 1483 (fp->f_flag & FWRITE) == 0) 1484 return (EBADF); 1485 1486 vp = (struct vnode *)fp->f_data; 1487 if (fp->f_type != DTYPE_VNODE 1488 || vp->v_type == VFIFO) 1489 return (ESPIPE); 1490 1491 offset = SCARG(uap, offset); 1492 1493 /* 1494 * XXX This works because no file systems actually 1495 * XXX take any action on the seek operation. 1496 */ 1497 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1498 return (error); 1499 1500 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1501 &offset, 0, retval)); 1502 } 1503 1504 /* 1505 * Check access permissions. 1506 */ 1507 int 1508 sys_access(p, v, retval) 1509 struct proc *p; 1510 void *v; 1511 register_t *retval; 1512 { 1513 register struct sys_access_args /* { 1514 syscallarg(const char *) path; 1515 syscallarg(int) flags; 1516 } */ *uap = v; 1517 register struct ucred *cred = p->p_ucred; 1518 register struct vnode *vp; 1519 int error, flags, t_gid, t_uid; 1520 struct nameidata nd; 1521 1522 t_uid = cred->cr_uid; 1523 t_gid = cred->cr_gid; 1524 cred->cr_uid = p->p_cred->p_ruid; 1525 cred->cr_gid = p->p_cred->p_rgid; 1526 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1527 SCARG(uap, path), p); 1528 if ((error = namei(&nd)) != 0) 1529 goto out1; 1530 vp = nd.ni_vp; 1531 1532 /* Flags == 0 means only check for existence. */ 1533 if (SCARG(uap, flags)) { 1534 flags = 0; 1535 if (SCARG(uap, flags) & R_OK) 1536 flags |= VREAD; 1537 if (SCARG(uap, flags) & W_OK) 1538 flags |= VWRITE; 1539 if (SCARG(uap, flags) & X_OK) 1540 flags |= VEXEC; 1541 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1542 error = VOP_ACCESS(vp, flags, cred, p); 1543 } 1544 vput(vp); 1545 out1: 1546 cred->cr_uid = t_uid; 1547 cred->cr_gid = t_gid; 1548 return (error); 1549 } 1550 1551 /* 1552 * Get file status; this version follows links. 1553 */ 1554 /* ARGSUSED */ 1555 int 1556 sys___stat13(p, v, retval) 1557 struct proc *p; 1558 void *v; 1559 register_t *retval; 1560 { 1561 register struct sys___stat13_args /* { 1562 syscallarg(const char *) path; 1563 syscallarg(struct stat *) ub; 1564 } */ *uap = v; 1565 struct stat sb; 1566 int error; 1567 struct nameidata nd; 1568 1569 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1570 SCARG(uap, path), p); 1571 if ((error = namei(&nd)) != 0) 1572 return (error); 1573 error = vn_stat(nd.ni_vp, &sb, p); 1574 vput(nd.ni_vp); 1575 if (error) 1576 return (error); 1577 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1578 return (error); 1579 } 1580 1581 /* 1582 * Get file status; this version does not follow links. 1583 */ 1584 /* ARGSUSED */ 1585 int 1586 sys___lstat13(p, v, retval) 1587 struct proc *p; 1588 void *v; 1589 register_t *retval; 1590 { 1591 register struct sys___lstat13_args /* { 1592 syscallarg(const char *) path; 1593 syscallarg(struct stat *) ub; 1594 } */ *uap = v; 1595 struct stat sb; 1596 int error; 1597 struct nameidata nd; 1598 1599 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1600 SCARG(uap, path), p); 1601 if ((error = namei(&nd)) != 0) 1602 return (error); 1603 error = vn_stat(nd.ni_vp, &sb, p); 1604 vput(nd.ni_vp); 1605 if (error) 1606 return (error); 1607 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1608 return (error); 1609 } 1610 1611 /* 1612 * Get configurable pathname variables. 1613 */ 1614 /* ARGSUSED */ 1615 int 1616 sys_pathconf(p, v, retval) 1617 struct proc *p; 1618 void *v; 1619 register_t *retval; 1620 { 1621 register struct sys_pathconf_args /* { 1622 syscallarg(const char *) path; 1623 syscallarg(int) name; 1624 } */ *uap = v; 1625 int error; 1626 struct nameidata nd; 1627 1628 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1629 SCARG(uap, path), p); 1630 if ((error = namei(&nd)) != 0) 1631 return (error); 1632 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1633 vput(nd.ni_vp); 1634 return (error); 1635 } 1636 1637 /* 1638 * Return target name of a symbolic link. 1639 */ 1640 /* ARGSUSED */ 1641 int 1642 sys_readlink(p, v, retval) 1643 struct proc *p; 1644 void *v; 1645 register_t *retval; 1646 { 1647 register struct sys_readlink_args /* { 1648 syscallarg(const char *) path; 1649 syscallarg(char *) buf; 1650 syscallarg(size_t) count; 1651 } */ *uap = v; 1652 register struct vnode *vp; 1653 struct iovec aiov; 1654 struct uio auio; 1655 int error; 1656 struct nameidata nd; 1657 1658 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1659 SCARG(uap, path), p); 1660 if ((error = namei(&nd)) != 0) 1661 return (error); 1662 vp = nd.ni_vp; 1663 if (vp->v_type != VLNK) 1664 error = EINVAL; 1665 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1666 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1667 aiov.iov_base = SCARG(uap, buf); 1668 aiov.iov_len = SCARG(uap, count); 1669 auio.uio_iov = &aiov; 1670 auio.uio_iovcnt = 1; 1671 auio.uio_offset = 0; 1672 auio.uio_rw = UIO_READ; 1673 auio.uio_segflg = UIO_USERSPACE; 1674 auio.uio_procp = p; 1675 auio.uio_resid = SCARG(uap, count); 1676 error = VOP_READLINK(vp, &auio, p->p_ucred); 1677 } 1678 vput(vp); 1679 *retval = SCARG(uap, count) - auio.uio_resid; 1680 return (error); 1681 } 1682 1683 /* 1684 * Change flags of a file given a path name. 1685 */ 1686 /* ARGSUSED */ 1687 int 1688 sys_chflags(p, v, retval) 1689 struct proc *p; 1690 void *v; 1691 register_t *retval; 1692 { 1693 register struct sys_chflags_args /* { 1694 syscallarg(const char *) path; 1695 syscallarg(u_long) flags; 1696 } */ *uap = v; 1697 register struct vnode *vp; 1698 struct vattr vattr; 1699 int error; 1700 struct nameidata nd; 1701 1702 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1703 if ((error = namei(&nd)) != 0) 1704 return (error); 1705 vp = nd.ni_vp; 1706 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1707 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1708 VATTR_NULL(&vattr); 1709 vattr.va_flags = SCARG(uap, flags); 1710 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1711 vput(vp); 1712 return (error); 1713 } 1714 1715 /* 1716 * Change flags of a file given a file descriptor. 1717 */ 1718 /* ARGSUSED */ 1719 int 1720 sys_fchflags(p, v, retval) 1721 struct proc *p; 1722 void *v; 1723 register_t *retval; 1724 { 1725 register struct sys_fchflags_args /* { 1726 syscallarg(int) fd; 1727 syscallarg(u_long) flags; 1728 } */ *uap = v; 1729 struct vattr vattr; 1730 struct vnode *vp; 1731 struct file *fp; 1732 int error; 1733 1734 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1735 return (error); 1736 vp = (struct vnode *)fp->f_data; 1737 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1738 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1739 VATTR_NULL(&vattr); 1740 vattr.va_flags = SCARG(uap, flags); 1741 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1742 VOP_UNLOCK(vp, 0); 1743 return (error); 1744 } 1745 1746 /* 1747 * Change mode of a file given path name; this version follows links. 1748 */ 1749 /* ARGSUSED */ 1750 int 1751 sys_chmod(p, v, retval) 1752 struct proc *p; 1753 void *v; 1754 register_t *retval; 1755 { 1756 register struct sys_chmod_args /* { 1757 syscallarg(const char *) path; 1758 syscallarg(int) mode; 1759 } */ *uap = v; 1760 int error; 1761 struct nameidata nd; 1762 1763 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1764 if ((error = namei(&nd)) != 0) 1765 return (error); 1766 1767 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1768 1769 vrele(nd.ni_vp); 1770 return (error); 1771 } 1772 1773 /* 1774 * Change mode of a file given a file descriptor. 1775 */ 1776 /* ARGSUSED */ 1777 int 1778 sys_fchmod(p, v, retval) 1779 struct proc *p; 1780 void *v; 1781 register_t *retval; 1782 { 1783 register struct sys_fchmod_args /* { 1784 syscallarg(int) fd; 1785 syscallarg(int) mode; 1786 } */ *uap = v; 1787 struct file *fp; 1788 int error; 1789 1790 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1791 return (error); 1792 1793 return (change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p)); 1794 } 1795 1796 /* 1797 * Change mode of a file given path name; this version does not follow links. 1798 */ 1799 /* ARGSUSED */ 1800 int 1801 sys_lchmod(p, v, retval) 1802 struct proc *p; 1803 void *v; 1804 register_t *retval; 1805 { 1806 register struct sys_lchmod_args /* { 1807 syscallarg(const char *) path; 1808 syscallarg(int) mode; 1809 } */ *uap = v; 1810 int error; 1811 struct nameidata nd; 1812 1813 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1814 if ((error = namei(&nd)) != 0) 1815 return (error); 1816 1817 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1818 1819 vrele(nd.ni_vp); 1820 return (error); 1821 } 1822 1823 /* 1824 * Common routine to set mode given a vnode. 1825 */ 1826 static int 1827 change_mode(vp, mode, p) 1828 struct vnode *vp; 1829 int mode; 1830 struct proc *p; 1831 { 1832 struct vattr vattr; 1833 int error; 1834 1835 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1836 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1837 VATTR_NULL(&vattr); 1838 vattr.va_mode = mode & ALLPERMS; 1839 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1840 VOP_UNLOCK(vp, 0); 1841 return (error); 1842 } 1843 1844 /* 1845 * Set ownership given a path name; this version follows links. 1846 */ 1847 /* ARGSUSED */ 1848 int 1849 sys_chown(p, v, retval) 1850 struct proc *p; 1851 void *v; 1852 register_t *retval; 1853 { 1854 register struct sys_chown_args /* { 1855 syscallarg(const char *) path; 1856 syscallarg(uid_t) uid; 1857 syscallarg(gid_t) gid; 1858 } */ *uap = v; 1859 int error; 1860 struct nameidata nd; 1861 1862 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1863 if ((error = namei(&nd)) != 0) 1864 return (error); 1865 1866 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1867 1868 vrele(nd.ni_vp); 1869 return (error); 1870 } 1871 1872 /* 1873 * Set ownership given a path name; this version follows links. 1874 * Provides POSIX semantics. 1875 */ 1876 /* ARGSUSED */ 1877 int 1878 sys___posix_chown(p, v, retval) 1879 struct proc *p; 1880 void *v; 1881 register_t *retval; 1882 { 1883 register struct sys_chown_args /* { 1884 syscallarg(const char *) path; 1885 syscallarg(uid_t) uid; 1886 syscallarg(gid_t) gid; 1887 } */ *uap = v; 1888 int error; 1889 struct nameidata nd; 1890 1891 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1892 if ((error = namei(&nd)) != 0) 1893 return (error); 1894 1895 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 1896 1897 vrele(nd.ni_vp); 1898 return (error); 1899 } 1900 1901 /* 1902 * Set ownership given a file descriptor. 1903 */ 1904 /* ARGSUSED */ 1905 int 1906 sys_fchown(p, v, retval) 1907 struct proc *p; 1908 void *v; 1909 register_t *retval; 1910 { 1911 register struct sys_fchown_args /* { 1912 syscallarg(int) fd; 1913 syscallarg(uid_t) uid; 1914 syscallarg(gid_t) gid; 1915 } */ *uap = v; 1916 int error; 1917 struct file *fp; 1918 1919 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1920 return (error); 1921 1922 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1923 SCARG(uap, gid), p, 0)); 1924 } 1925 1926 /* 1927 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 1928 */ 1929 /* ARGSUSED */ 1930 int 1931 sys___posix_fchown(p, v, retval) 1932 struct proc *p; 1933 void *v; 1934 register_t *retval; 1935 { 1936 register struct sys_fchown_args /* { 1937 syscallarg(int) fd; 1938 syscallarg(uid_t) uid; 1939 syscallarg(gid_t) gid; 1940 } */ *uap = v; 1941 int error; 1942 struct file *fp; 1943 1944 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1945 return (error); 1946 1947 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1948 SCARG(uap, gid), p, 1)); 1949 } 1950 1951 /* 1952 * Set ownership given a path name; this version does not follow links. 1953 */ 1954 /* ARGSUSED */ 1955 int 1956 sys_lchown(p, v, retval) 1957 struct proc *p; 1958 void *v; 1959 register_t *retval; 1960 { 1961 register struct sys_lchown_args /* { 1962 syscallarg(const char *) path; 1963 syscallarg(uid_t) uid; 1964 syscallarg(gid_t) gid; 1965 } */ *uap = v; 1966 int error; 1967 struct nameidata nd; 1968 1969 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1970 if ((error = namei(&nd)) != 0) 1971 return (error); 1972 1973 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1974 1975 vrele(nd.ni_vp); 1976 return (error); 1977 } 1978 1979 /* 1980 * Set ownership given a path name; this version does not follow links. 1981 * Provides POSIX/XPG semantics. 1982 */ 1983 /* ARGSUSED */ 1984 int 1985 sys___posix_lchown(p, v, retval) 1986 struct proc *p; 1987 void *v; 1988 register_t *retval; 1989 { 1990 register struct sys_lchown_args /* { 1991 syscallarg(const char *) path; 1992 syscallarg(uid_t) uid; 1993 syscallarg(gid_t) gid; 1994 } */ *uap = v; 1995 int error; 1996 struct nameidata nd; 1997 1998 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1999 if ((error = namei(&nd)) != 0) 2000 return (error); 2001 2002 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2003 2004 vrele(nd.ni_vp); 2005 return (error); 2006 } 2007 2008 /* 2009 * Common routine to set ownership given a vnode. 2010 */ 2011 static int 2012 change_owner(vp, uid, gid, p, posix_semantics) 2013 register struct vnode *vp; 2014 uid_t uid; 2015 gid_t gid; 2016 struct proc *p; 2017 int posix_semantics; 2018 { 2019 struct vattr vattr; 2020 mode_t newmode; 2021 int error; 2022 2023 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2024 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2025 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2026 goto out; 2027 2028 #define CHANGED(x) ((x) != -1) 2029 newmode = vattr.va_mode; 2030 if (posix_semantics) { 2031 /* 2032 * POSIX/XPG semantics: if the caller is not the super-user, 2033 * clear set-user-id and set-group-id bits. Both POSIX and 2034 * the XPG consider the behaviour for calls by the super-user 2035 * implementation-defined; we leave the set-user-id and set- 2036 * group-id settings intact in that case. 2037 */ 2038 if (suser(p->p_ucred, NULL) != 0) 2039 newmode &= ~(S_ISUID | S_ISGID); 2040 } else { 2041 /* 2042 * NetBSD semantics: when changing owner and/or group, 2043 * clear the respective bit(s). 2044 */ 2045 if (CHANGED(uid)) 2046 newmode &= ~S_ISUID; 2047 if (CHANGED(gid)) 2048 newmode &= ~S_ISGID; 2049 } 2050 /* Update va_mode iff altered. */ 2051 if (vattr.va_mode == newmode) 2052 newmode = VNOVAL; 2053 2054 VATTR_NULL(&vattr); 2055 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2056 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2057 vattr.va_mode = newmode; 2058 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2059 #undef CHANGED 2060 2061 out: 2062 VOP_UNLOCK(vp, 0); 2063 return (error); 2064 } 2065 2066 /* 2067 * Set the access and modification times given a path name; this 2068 * version follows links. 2069 */ 2070 /* ARGSUSED */ 2071 int 2072 sys_utimes(p, v, retval) 2073 struct proc *p; 2074 void *v; 2075 register_t *retval; 2076 { 2077 register struct sys_utimes_args /* { 2078 syscallarg(const char *) path; 2079 syscallarg(const struct timeval *) tptr; 2080 } */ *uap = v; 2081 int error; 2082 struct nameidata nd; 2083 2084 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2085 if ((error = namei(&nd)) != 0) 2086 return (error); 2087 2088 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2089 2090 vrele(nd.ni_vp); 2091 return (error); 2092 } 2093 2094 /* 2095 * Set the access and modification times given a file descriptor. 2096 */ 2097 /* ARGSUSED */ 2098 int 2099 sys_futimes(p, v, retval) 2100 struct proc *p; 2101 void *v; 2102 register_t *retval; 2103 { 2104 register struct sys_futimes_args /* { 2105 syscallarg(int) fd; 2106 syscallarg(const struct timeval *) tptr; 2107 } */ *uap = v; 2108 int error; 2109 struct file *fp; 2110 2111 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2112 return (error); 2113 2114 return (change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), 2115 p)); 2116 } 2117 2118 /* 2119 * Set the access and modification times given a path name; this 2120 * version does not follow links. 2121 */ 2122 /* ARGSUSED */ 2123 int 2124 sys_lutimes(p, v, retval) 2125 struct proc *p; 2126 void *v; 2127 register_t *retval; 2128 { 2129 register struct sys_lutimes_args /* { 2130 syscallarg(const char *) path; 2131 syscallarg(const struct timeval *) tptr; 2132 } */ *uap = v; 2133 int error; 2134 struct nameidata nd; 2135 2136 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2137 if ((error = namei(&nd)) != 0) 2138 return (error); 2139 2140 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2141 2142 vrele(nd.ni_vp); 2143 return (error); 2144 } 2145 2146 /* 2147 * Common routine to set access and modification times given a vnode. 2148 */ 2149 static int 2150 change_utimes(vp, tptr, p) 2151 struct vnode *vp; 2152 const struct timeval *tptr; 2153 struct proc *p; 2154 { 2155 struct timeval tv[2]; 2156 struct vattr vattr; 2157 int error; 2158 2159 VATTR_NULL(&vattr); 2160 if (tptr == NULL) { 2161 microtime(&tv[0]); 2162 tv[1] = tv[0]; 2163 vattr.va_vaflags |= VA_UTIMES_NULL; 2164 } else { 2165 error = copyin(tptr, tv, sizeof(tv)); 2166 if (error) 2167 return (error); 2168 } 2169 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2170 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2171 vattr.va_atime.tv_sec = tv[0].tv_sec; 2172 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2173 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2174 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2175 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2176 VOP_UNLOCK(vp, 0); 2177 return (error); 2178 } 2179 2180 /* 2181 * Truncate a file given its path name. 2182 */ 2183 /* ARGSUSED */ 2184 int 2185 sys_truncate(p, v, retval) 2186 struct proc *p; 2187 void *v; 2188 register_t *retval; 2189 { 2190 register struct sys_truncate_args /* { 2191 syscallarg(const char *) path; 2192 syscallarg(int) pad; 2193 syscallarg(off_t) length; 2194 } */ *uap = v; 2195 register struct vnode *vp; 2196 struct vattr vattr; 2197 int error; 2198 struct nameidata nd; 2199 2200 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2201 if ((error = namei(&nd)) != 0) 2202 return (error); 2203 vp = nd.ni_vp; 2204 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2205 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2206 if (vp->v_type == VDIR) 2207 error = EISDIR; 2208 else if ((error = vn_writechk(vp)) == 0 && 2209 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2210 VATTR_NULL(&vattr); 2211 vattr.va_size = SCARG(uap, length); 2212 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2213 } 2214 vput(vp); 2215 return (error); 2216 } 2217 2218 /* 2219 * Truncate a file given a file descriptor. 2220 */ 2221 /* ARGSUSED */ 2222 int 2223 sys_ftruncate(p, v, retval) 2224 struct proc *p; 2225 void *v; 2226 register_t *retval; 2227 { 2228 register struct sys_ftruncate_args /* { 2229 syscallarg(int) fd; 2230 syscallarg(int) pad; 2231 syscallarg(off_t) length; 2232 } */ *uap = v; 2233 struct vattr vattr; 2234 struct vnode *vp; 2235 struct file *fp; 2236 int error; 2237 2238 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2239 return (error); 2240 if ((fp->f_flag & FWRITE) == 0) 2241 return (EINVAL); 2242 vp = (struct vnode *)fp->f_data; 2243 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2244 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2245 if (vp->v_type == VDIR) 2246 error = EISDIR; 2247 else if ((error = vn_writechk(vp)) == 0) { 2248 VATTR_NULL(&vattr); 2249 vattr.va_size = SCARG(uap, length); 2250 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2251 } 2252 VOP_UNLOCK(vp, 0); 2253 return (error); 2254 } 2255 2256 /* 2257 * Sync an open file. 2258 */ 2259 /* ARGSUSED */ 2260 int 2261 sys_fsync(p, v, retval) 2262 struct proc *p; 2263 void *v; 2264 register_t *retval; 2265 { 2266 struct sys_fsync_args /* { 2267 syscallarg(int) fd; 2268 } */ *uap = v; 2269 register struct vnode *vp; 2270 struct file *fp; 2271 int error; 2272 2273 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2274 return (error); 2275 vp = (struct vnode *)fp->f_data; 2276 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2277 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2278 VOP_UNLOCK(vp, 0); 2279 return (error); 2280 } 2281 2282 /* 2283 * Sync the data of an open file. 2284 */ 2285 /* ARGSUSED */ 2286 int 2287 sys_fdatasync(p, v, retval) 2288 struct proc *p; 2289 void *v; 2290 register_t *retval; 2291 { 2292 struct sys_fdatasync_args /* { 2293 syscallarg(int) fd; 2294 } */ *uap = v; 2295 struct vnode *vp; 2296 struct file *fp; 2297 int error; 2298 2299 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2300 return (error); 2301 vp = (struct vnode *)fp->f_data; 2302 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2303 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2304 VOP_UNLOCK(vp, 0); 2305 return (error); 2306 } 2307 2308 /* 2309 * Rename files, (standard) BSD semantics frontend. 2310 */ 2311 /* ARGSUSED */ 2312 int 2313 sys_rename(p, v, retval) 2314 struct proc *p; 2315 void *v; 2316 register_t *retval; 2317 { 2318 register struct sys_rename_args /* { 2319 syscallarg(const char *) from; 2320 syscallarg(const char *) to; 2321 } */ *uap = v; 2322 2323 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2324 } 2325 2326 /* 2327 * Rename files, POSIX semantics frontend. 2328 */ 2329 /* ARGSUSED */ 2330 int 2331 sys___posix_rename(p, v, retval) 2332 struct proc *p; 2333 void *v; 2334 register_t *retval; 2335 { 2336 register struct sys___posix_rename_args /* { 2337 syscallarg(const char *) from; 2338 syscallarg(const char *) to; 2339 } */ *uap = v; 2340 2341 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2342 } 2343 2344 /* 2345 * Rename files. Source and destination must either both be directories, 2346 * or both not be directories. If target is a directory, it must be empty. 2347 * If `from' and `to' refer to the same object, the value of the `retain' 2348 * argument is used to determine whether `from' will be 2349 * 2350 * (retain == 0) deleted unless `from' and `to' refer to the same 2351 * object in the file system's name space (BSD). 2352 * (retain == 1) always retained (POSIX). 2353 */ 2354 static int 2355 rename_files(from, to, p, retain) 2356 const char *from, *to; 2357 struct proc *p; 2358 int retain; 2359 { 2360 register struct vnode *tvp, *fvp, *tdvp; 2361 struct nameidata fromnd, tond; 2362 int error; 2363 2364 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2365 from, p); 2366 if ((error = namei(&fromnd)) != 0) 2367 return (error); 2368 fvp = fromnd.ni_vp; 2369 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2370 UIO_USERSPACE, to, p); 2371 if ((error = namei(&tond)) != 0) { 2372 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2373 vrele(fromnd.ni_dvp); 2374 vrele(fvp); 2375 goto out1; 2376 } 2377 tdvp = tond.ni_dvp; 2378 tvp = tond.ni_vp; 2379 2380 if (tvp != NULL) { 2381 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2382 error = ENOTDIR; 2383 goto out; 2384 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2385 error = EISDIR; 2386 goto out; 2387 } 2388 } 2389 2390 if (fvp == tdvp) 2391 error = EINVAL; 2392 2393 /* 2394 * Source and destination refer to the same object. 2395 */ 2396 if (fvp == tvp) { 2397 if (retain) 2398 error = -1; 2399 else if (fromnd.ni_dvp == tdvp && 2400 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2401 !memcmp(fromnd.ni_cnd.cn_nameptr, 2402 tond.ni_cnd.cn_nameptr, 2403 fromnd.ni_cnd.cn_namelen)) 2404 error = -1; 2405 } 2406 2407 out: 2408 if (!error) { 2409 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2410 if (fromnd.ni_dvp != tdvp) 2411 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2412 if (tvp) { 2413 (void)uvm_vnp_uncache(tvp); 2414 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2415 } 2416 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2417 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2418 } else { 2419 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2420 if (tdvp == tvp) 2421 vrele(tdvp); 2422 else 2423 vput(tdvp); 2424 if (tvp) 2425 vput(tvp); 2426 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2427 vrele(fromnd.ni_dvp); 2428 vrele(fvp); 2429 } 2430 vrele(tond.ni_startdir); 2431 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2432 out1: 2433 if (fromnd.ni_startdir) 2434 vrele(fromnd.ni_startdir); 2435 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2436 return (error == -1 ? 0 : error); 2437 } 2438 2439 /* 2440 * Make a directory file. 2441 */ 2442 /* ARGSUSED */ 2443 int 2444 sys_mkdir(p, v, retval) 2445 struct proc *p; 2446 void *v; 2447 register_t *retval; 2448 { 2449 register struct sys_mkdir_args /* { 2450 syscallarg(const char *) path; 2451 syscallarg(int) mode; 2452 } */ *uap = v; 2453 register struct vnode *vp; 2454 struct vattr vattr; 2455 int error; 2456 struct nameidata nd; 2457 2458 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2459 if ((error = namei(&nd)) != 0) 2460 return (error); 2461 vp = nd.ni_vp; 2462 if (vp != NULL) { 2463 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2464 if (nd.ni_dvp == vp) 2465 vrele(nd.ni_dvp); 2466 else 2467 vput(nd.ni_dvp); 2468 vrele(vp); 2469 return (EEXIST); 2470 } 2471 VATTR_NULL(&vattr); 2472 vattr.va_type = VDIR; 2473 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 2474 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2475 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2476 if (!error) 2477 vput(nd.ni_vp); 2478 return (error); 2479 } 2480 2481 /* 2482 * Remove a directory file. 2483 */ 2484 /* ARGSUSED */ 2485 int 2486 sys_rmdir(p, v, retval) 2487 struct proc *p; 2488 void *v; 2489 register_t *retval; 2490 { 2491 struct sys_rmdir_args /* { 2492 syscallarg(const char *) path; 2493 } */ *uap = v; 2494 register struct vnode *vp; 2495 int error; 2496 struct nameidata nd; 2497 2498 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2499 SCARG(uap, path), p); 2500 if ((error = namei(&nd)) != 0) 2501 return (error); 2502 vp = nd.ni_vp; 2503 if (vp->v_type != VDIR) { 2504 error = ENOTDIR; 2505 goto out; 2506 } 2507 /* 2508 * No rmdir "." please. 2509 */ 2510 if (nd.ni_dvp == vp) { 2511 error = EINVAL; 2512 goto out; 2513 } 2514 /* 2515 * The root of a mounted filesystem cannot be deleted. 2516 */ 2517 if (vp->v_flag & VROOT) 2518 error = EBUSY; 2519 out: 2520 if (!error) { 2521 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2522 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2523 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2524 } else { 2525 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2526 if (nd.ni_dvp == vp) 2527 vrele(nd.ni_dvp); 2528 else 2529 vput(nd.ni_dvp); 2530 vput(vp); 2531 } 2532 return (error); 2533 } 2534 2535 /* 2536 * Read a block of directory entries in a file system independent format. 2537 */ 2538 int 2539 sys_getdents(p, v, retval) 2540 struct proc *p; 2541 void *v; 2542 register_t *retval; 2543 { 2544 register struct sys_getdents_args /* { 2545 syscallarg(int) fd; 2546 syscallarg(char *) buf; 2547 syscallarg(size_t) count; 2548 } */ *uap = v; 2549 struct file *fp; 2550 int error, done; 2551 2552 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2553 return (error); 2554 if ((fp->f_flag & FREAD) == 0) 2555 return (EBADF); 2556 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2557 SCARG(uap, count), &done, p, 0, 0); 2558 *retval = done; 2559 return (error); 2560 } 2561 2562 /* 2563 * Set the mode mask for creation of filesystem nodes. 2564 */ 2565 int 2566 sys_umask(p, v, retval) 2567 struct proc *p; 2568 void *v; 2569 register_t *retval; 2570 { 2571 struct sys_umask_args /* { 2572 syscallarg(mode_t) newmask; 2573 } */ *uap = v; 2574 register struct filedesc *fdp; 2575 2576 fdp = p->p_fd; 2577 *retval = fdp->fd_cmask; 2578 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2579 return (0); 2580 } 2581 2582 /* 2583 * Void all references to file by ripping underlying filesystem 2584 * away from vnode. 2585 */ 2586 /* ARGSUSED */ 2587 int 2588 sys_revoke(p, v, retval) 2589 struct proc *p; 2590 void *v; 2591 register_t *retval; 2592 { 2593 register struct sys_revoke_args /* { 2594 syscallarg(const char *) path; 2595 } */ *uap = v; 2596 register struct vnode *vp; 2597 struct vattr vattr; 2598 int error; 2599 struct nameidata nd; 2600 2601 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2602 if ((error = namei(&nd)) != 0) 2603 return (error); 2604 vp = nd.ni_vp; 2605 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2606 goto out; 2607 if (p->p_ucred->cr_uid != vattr.va_uid && 2608 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2609 goto out; 2610 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2611 VOP_REVOKE(vp, REVOKEALL); 2612 out: 2613 vrele(vp); 2614 return (error); 2615 } 2616 2617 /* 2618 * Convert a user file descriptor to a kernel file entry. 2619 */ 2620 int 2621 getvnode(fdp, fd, fpp) 2622 struct filedesc *fdp; 2623 int fd; 2624 struct file **fpp; 2625 { 2626 struct vnode *vp; 2627 struct file *fp; 2628 2629 if ((u_int)fd >= fdp->fd_nfiles || 2630 (fp = fdp->fd_ofiles[fd]) == NULL) 2631 return (EBADF); 2632 if (fp->f_type != DTYPE_VNODE) 2633 return (EINVAL); 2634 vp = (struct vnode *)fp->f_data; 2635 if (vp->v_type == VBAD) 2636 return (EBADF); 2637 *fpp = fp; 2638 return (0); 2639 } 2640
Indexes created Fri Oct 03 02:09:57 GMT 2025