vfs_syscalls.c revision 1.133.2.1
1 /* $NetBSD: vfs_syscalls.c,v 1.133.2.1 2000/02/01 23:10:54 he 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 vfs_unbusy(mp); 676 return (error); 677 } 678 sfsp += sizeof(*sp); 679 } 680 count++; 681 simple_lock(&mountlist_slock); 682 nmp = mp->mnt_list.cqe_next; 683 vfs_unbusy(mp); 684 } 685 simple_unlock(&mountlist_slock); 686 if (sfsp && count > maxcount) 687 *retval = maxcount; 688 else 689 *retval = count; 690 return (0); 691 } 692 693 /* 694 * Change current working directory to a given file descriptor. 695 */ 696 /* ARGSUSED */ 697 int 698 sys_fchdir(p, v, retval) 699 struct proc *p; 700 void *v; 701 register_t *retval; 702 { 703 struct sys_fchdir_args /* { 704 syscallarg(int) fd; 705 } */ *uap = v; 706 register struct filedesc *fdp = p->p_fd; 707 struct vnode *vp, *tdp; 708 struct mount *mp; 709 struct file *fp; 710 int error; 711 712 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 713 return (error); 714 vp = (struct vnode *)fp->f_data; 715 716 VREF(vp); 717 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 718 if (vp->v_type != VDIR) 719 error = ENOTDIR; 720 else 721 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 722 while (!error && (mp = vp->v_mountedhere) != NULL) { 723 if (vfs_busy(mp, 0, 0)) 724 continue; 725 error = VFS_ROOT(mp, &tdp); 726 vfs_unbusy(mp); 727 if (error) 728 break; 729 vput(vp); 730 vp = tdp; 731 } 732 if (error) { 733 vput(vp); 734 return (error); 735 } 736 VOP_UNLOCK(vp, 0); 737 738 /* 739 * Disallow changing to a directory not under the process's 740 * current root directory (if there is one). 741 */ 742 if (fdp->fd_rdir && 743 !vn_isunder(vp, NULL, p)) { 744 vrele(vp); 745 return EPERM; /* operation not permitted */ 746 } 747 748 vrele(fdp->fd_cdir); 749 fdp->fd_cdir = vp; 750 return (0); 751 } 752 753 /* 754 * Change this process's notion of the root directory to a given file descriptor. 755 */ 756 757 int 758 sys_fchroot(p, v, retval) 759 struct proc *p; 760 void *v; 761 register_t *retval; 762 { 763 struct sys_fchroot_args *uap = v; 764 struct filedesc *fdp = p->p_fd; 765 struct vnode *vp; 766 struct file *fp; 767 int error; 768 769 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 770 return error; 771 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 772 return error; 773 vp = (struct vnode *) fp->f_data; 774 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 775 if (vp->v_type != VDIR) 776 error = ENOTDIR; 777 else 778 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 779 VOP_UNLOCK(vp, 0); 780 if (error) 781 return error; 782 VREF(vp); 783 784 /* 785 * Prevent escaping from chroot by putting the root under 786 * the working directory. Silently chdir to / if we aren't 787 * already there. 788 */ 789 if (!vn_isunder(fdp->fd_cdir, vp, p)) { 790 /* 791 * XXX would be more failsafe to change directory to a 792 * deadfs node here instead 793 */ 794 vrele(fdp->fd_cdir); 795 VREF(vp); 796 fdp->fd_cdir = vp; 797 } 798 799 if (fdp->fd_rdir != NULL) 800 vrele(fdp->fd_rdir); 801 fdp->fd_rdir = vp; 802 return 0; 803 } 804 805 806 807 /* 808 * Change current working directory (``.''). 809 */ 810 /* ARGSUSED */ 811 int 812 sys_chdir(p, v, retval) 813 struct proc *p; 814 void *v; 815 register_t *retval; 816 { 817 struct sys_chdir_args /* { 818 syscallarg(const char *) path; 819 } */ *uap = v; 820 register struct filedesc *fdp = p->p_fd; 821 int error; 822 struct nameidata nd; 823 824 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 825 SCARG(uap, path), p); 826 if ((error = change_dir(&nd, p)) != 0) 827 return (error); 828 vrele(fdp->fd_cdir); 829 fdp->fd_cdir = nd.ni_vp; 830 return (0); 831 } 832 833 /* 834 * Change notion of root (``/'') directory. 835 */ 836 /* ARGSUSED */ 837 int 838 sys_chroot(p, v, retval) 839 struct proc *p; 840 void *v; 841 register_t *retval; 842 { 843 struct sys_chroot_args /* { 844 syscallarg(const char *) path; 845 } */ *uap = v; 846 register struct filedesc *fdp = p->p_fd; 847 struct vnode *vp; 848 int error; 849 struct nameidata nd; 850 851 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 852 return (error); 853 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 854 SCARG(uap, path), p); 855 if ((error = change_dir(&nd, p)) != 0) 856 return (error); 857 if (fdp->fd_rdir != NULL) 858 vrele(fdp->fd_rdir); 859 vp = nd.ni_vp; 860 fdp->fd_rdir = vp; 861 862 /* 863 * Prevent escaping from chroot by putting the root under 864 * the working directory. Silently chdir to / if we aren't 865 * already there. 866 */ 867 if (!vn_isunder(fdp->fd_cdir, vp, p)) { 868 /* 869 * XXX would be more failsafe to change directory to a 870 * deadfs node here instead 871 */ 872 vrele(fdp->fd_cdir); 873 VREF(vp); 874 fdp->fd_cdir = vp; 875 } 876 877 return (0); 878 } 879 880 /* 881 * Common routine for chroot and chdir. 882 */ 883 static int 884 change_dir(ndp, p) 885 register struct nameidata *ndp; 886 struct proc *p; 887 { 888 struct vnode *vp; 889 int error; 890 891 if ((error = namei(ndp)) != 0) 892 return (error); 893 vp = ndp->ni_vp; 894 if (vp->v_type != VDIR) 895 error = ENOTDIR; 896 else 897 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 898 899 if (error) 900 vput(vp); 901 else 902 VOP_UNLOCK(vp, 0); 903 return (error); 904 } 905 906 /* 907 * Check permissions, allocate an open file structure, 908 * and call the device open routine if any. 909 */ 910 int 911 sys_open(p, v, retval) 912 struct proc *p; 913 void *v; 914 register_t *retval; 915 { 916 register struct sys_open_args /* { 917 syscallarg(const char *) path; 918 syscallarg(int) flags; 919 syscallarg(int) mode; 920 } */ *uap = v; 921 register struct filedesc *fdp = p->p_fd; 922 register struct file *fp; 923 register struct vnode *vp; 924 int flags, cmode; 925 struct file *nfp; 926 int type, indx, error; 927 struct flock lf; 928 struct nameidata nd; 929 930 flags = FFLAGS(SCARG(uap, flags)); 931 if ((flags & (FREAD | FWRITE)) == 0) 932 return (EINVAL); 933 if ((error = falloc(p, &nfp, &indx)) != 0) 934 return (error); 935 fp = nfp; 936 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 937 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 938 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 939 if ((error = vn_open(&nd, flags, cmode)) != 0) { 940 ffree(fp); 941 if ((error == ENODEV || error == ENXIO) && 942 p->p_dupfd >= 0 && /* XXX from fdopen */ 943 (error = 944 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 945 *retval = indx; 946 return (0); 947 } 948 if (error == ERESTART) 949 error = EINTR; 950 fdp->fd_ofiles[indx] = NULL; 951 return (error); 952 } 953 p->p_dupfd = 0; 954 vp = nd.ni_vp; 955 fp->f_flag = flags & FMASK; 956 fp->f_type = DTYPE_VNODE; 957 fp->f_ops = &vnops; 958 fp->f_data = (caddr_t)vp; 959 if (flags & (O_EXLOCK | O_SHLOCK)) { 960 lf.l_whence = SEEK_SET; 961 lf.l_start = 0; 962 lf.l_len = 0; 963 if (flags & O_EXLOCK) 964 lf.l_type = F_WRLCK; 965 else 966 lf.l_type = F_RDLCK; 967 type = F_FLOCK; 968 if ((flags & FNONBLOCK) == 0) 969 type |= F_WAIT; 970 VOP_UNLOCK(vp, 0); 971 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 972 if (error) { 973 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 974 ffree(fp); 975 fdp->fd_ofiles[indx] = NULL; 976 return (error); 977 } 978 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 979 fp->f_flag |= FHASLOCK; 980 } 981 VOP_UNLOCK(vp, 0); 982 *retval = indx; 983 return (0); 984 } 985 986 /* 987 * Create a special file. 988 */ 989 /* ARGSUSED */ 990 int 991 sys_mknod(p, v, retval) 992 struct proc *p; 993 void *v; 994 register_t *retval; 995 { 996 register struct sys_mknod_args /* { 997 syscallarg(const char *) path; 998 syscallarg(int) mode; 999 syscallarg(int) dev; 1000 } */ *uap = v; 1001 register struct vnode *vp; 1002 struct vattr vattr; 1003 int error; 1004 int whiteout = 0; 1005 struct nameidata nd; 1006 1007 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1008 return (error); 1009 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1010 if ((error = namei(&nd)) != 0) 1011 return (error); 1012 vp = nd.ni_vp; 1013 if (vp != NULL) 1014 error = EEXIST; 1015 else { 1016 VATTR_NULL(&vattr); 1017 vattr.va_mode = 1018 (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 1019 vattr.va_rdev = SCARG(uap, dev); 1020 whiteout = 0; 1021 1022 switch (SCARG(uap, mode) & S_IFMT) { 1023 case S_IFMT: /* used by badsect to flag bad sectors */ 1024 vattr.va_type = VBAD; 1025 break; 1026 case S_IFCHR: 1027 vattr.va_type = VCHR; 1028 break; 1029 case S_IFBLK: 1030 vattr.va_type = VBLK; 1031 break; 1032 case S_IFWHT: 1033 whiteout = 1; 1034 break; 1035 default: 1036 error = EINVAL; 1037 break; 1038 } 1039 } 1040 if (!error) { 1041 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1042 if (whiteout) { 1043 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1044 if (error) 1045 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1046 vput(nd.ni_dvp); 1047 } else { 1048 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1049 &nd.ni_cnd, &vattr); 1050 } 1051 } else { 1052 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1053 if (nd.ni_dvp == vp) 1054 vrele(nd.ni_dvp); 1055 else 1056 vput(nd.ni_dvp); 1057 if (vp) 1058 vrele(vp); 1059 } 1060 return (error); 1061 } 1062 1063 /* 1064 * Create a named pipe. 1065 */ 1066 /* ARGSUSED */ 1067 int 1068 sys_mkfifo(p, v, retval) 1069 struct proc *p; 1070 void *v; 1071 register_t *retval; 1072 { 1073 register struct sys_mkfifo_args /* { 1074 syscallarg(const char *) path; 1075 syscallarg(int) mode; 1076 } */ *uap = v; 1077 struct vattr vattr; 1078 int error; 1079 struct nameidata nd; 1080 1081 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1082 if ((error = namei(&nd)) != 0) 1083 return (error); 1084 if (nd.ni_vp != NULL) { 1085 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1086 if (nd.ni_dvp == nd.ni_vp) 1087 vrele(nd.ni_dvp); 1088 else 1089 vput(nd.ni_dvp); 1090 vrele(nd.ni_vp); 1091 return (EEXIST); 1092 } 1093 VATTR_NULL(&vattr); 1094 vattr.va_type = VFIFO; 1095 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 1096 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1097 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1098 } 1099 1100 /* 1101 * Make a hard file link. 1102 */ 1103 /* ARGSUSED */ 1104 int 1105 sys_link(p, v, retval) 1106 struct proc *p; 1107 void *v; 1108 register_t *retval; 1109 { 1110 register struct sys_link_args /* { 1111 syscallarg(const char *) path; 1112 syscallarg(const char *) link; 1113 } */ *uap = v; 1114 register struct vnode *vp; 1115 struct nameidata nd; 1116 int error; 1117 1118 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1119 if ((error = namei(&nd)) != 0) 1120 return (error); 1121 vp = nd.ni_vp; 1122 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1123 if ((error = namei(&nd)) != 0) 1124 goto out; 1125 if (nd.ni_vp) { 1126 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1127 if (nd.ni_dvp == nd.ni_vp) 1128 vrele(nd.ni_dvp); 1129 else 1130 vput(nd.ni_dvp); 1131 vrele(nd.ni_vp); 1132 error = EEXIST; 1133 goto out; 1134 } 1135 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1136 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1137 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1138 out: 1139 vrele(vp); 1140 return (error); 1141 } 1142 1143 /* 1144 * Make a symbolic link. 1145 */ 1146 /* ARGSUSED */ 1147 int 1148 sys_symlink(p, v, retval) 1149 struct proc *p; 1150 void *v; 1151 register_t *retval; 1152 { 1153 register struct sys_symlink_args /* { 1154 syscallarg(const char *) path; 1155 syscallarg(const char *) link; 1156 } */ *uap = v; 1157 struct vattr vattr; 1158 char *path; 1159 int error; 1160 struct nameidata nd; 1161 1162 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1163 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1164 if (error) 1165 goto out; 1166 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1167 if ((error = namei(&nd)) != 0) 1168 goto out; 1169 if (nd.ni_vp) { 1170 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1171 if (nd.ni_dvp == nd.ni_vp) 1172 vrele(nd.ni_dvp); 1173 else 1174 vput(nd.ni_dvp); 1175 vrele(nd.ni_vp); 1176 error = EEXIST; 1177 goto out; 1178 } 1179 VATTR_NULL(&vattr); 1180 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1181 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1182 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1183 out: 1184 FREE(path, M_NAMEI); 1185 return (error); 1186 } 1187 1188 /* 1189 * Delete a whiteout from the filesystem. 1190 */ 1191 /* ARGSUSED */ 1192 int 1193 sys_undelete(p, v, retval) 1194 struct proc *p; 1195 void *v; 1196 register_t *retval; 1197 { 1198 register struct sys_undelete_args /* { 1199 syscallarg(const char *) path; 1200 } */ *uap = v; 1201 int error; 1202 struct nameidata nd; 1203 1204 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1205 SCARG(uap, path), p); 1206 error = namei(&nd); 1207 if (error) 1208 return (error); 1209 1210 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1211 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1212 if (nd.ni_dvp == nd.ni_vp) 1213 vrele(nd.ni_dvp); 1214 else 1215 vput(nd.ni_dvp); 1216 if (nd.ni_vp) 1217 vrele(nd.ni_vp); 1218 return (EEXIST); 1219 } 1220 1221 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1222 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1223 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1224 vput(nd.ni_dvp); 1225 return (error); 1226 } 1227 1228 /* 1229 * Delete a name from the filesystem. 1230 */ 1231 /* ARGSUSED */ 1232 int 1233 sys_unlink(p, v, retval) 1234 struct proc *p; 1235 void *v; 1236 register_t *retval; 1237 { 1238 struct sys_unlink_args /* { 1239 syscallarg(const char *) path; 1240 } */ *uap = v; 1241 register struct vnode *vp; 1242 int error; 1243 struct nameidata nd; 1244 1245 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1246 SCARG(uap, path), p); 1247 if ((error = namei(&nd)) != 0) 1248 return (error); 1249 vp = nd.ni_vp; 1250 1251 /* 1252 * The root of a mounted filesystem cannot be deleted. 1253 */ 1254 if (vp->v_flag & VROOT) { 1255 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1256 if (nd.ni_dvp == vp) 1257 vrele(nd.ni_dvp); 1258 else 1259 vput(nd.ni_dvp); 1260 vput(vp); 1261 error = EBUSY; 1262 goto out; 1263 } 1264 1265 (void)uvm_vnp_uncache(vp); 1266 1267 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1268 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1269 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1270 out: 1271 return (error); 1272 } 1273 1274 /* 1275 * Reposition read/write file offset. 1276 */ 1277 int 1278 sys_lseek(p, v, retval) 1279 struct proc *p; 1280 void *v; 1281 register_t *retval; 1282 { 1283 register struct sys_lseek_args /* { 1284 syscallarg(int) fd; 1285 syscallarg(int) pad; 1286 syscallarg(off_t) offset; 1287 syscallarg(int) whence; 1288 } */ *uap = v; 1289 struct ucred *cred = p->p_ucred; 1290 register struct filedesc *fdp = p->p_fd; 1291 register struct file *fp; 1292 struct vnode *vp; 1293 struct vattr vattr; 1294 register off_t newoff; 1295 int error; 1296 1297 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1298 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1299 return (EBADF); 1300 1301 vp = (struct vnode *)fp->f_data; 1302 if (fp->f_type != DTYPE_VNODE 1303 || vp->v_type == VFIFO) 1304 return (ESPIPE); 1305 1306 switch (SCARG(uap, whence)) { 1307 case SEEK_CUR: 1308 newoff = fp->f_offset + SCARG(uap, offset); 1309 break; 1310 case SEEK_END: 1311 error = VOP_GETATTR(vp, &vattr, cred, p); 1312 if (error) 1313 return (error); 1314 newoff = SCARG(uap, offset) + vattr.va_size; 1315 break; 1316 case SEEK_SET: 1317 newoff = SCARG(uap, offset); 1318 break; 1319 default: 1320 return (EINVAL); 1321 } 1322 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1323 return (error); 1324 1325 *(off_t *)retval = fp->f_offset = newoff; 1326 return (0); 1327 } 1328 1329 /* 1330 * Positional read system call. 1331 */ 1332 int 1333 sys_pread(p, v, retval) 1334 struct proc *p; 1335 void *v; 1336 register_t *retval; 1337 { 1338 struct sys_pread_args /* { 1339 syscallarg(int) fd; 1340 syscallarg(void *) buf; 1341 syscallarg(size_t) nbyte; 1342 syscallarg(off_t) offset; 1343 } */ *uap = v; 1344 struct filedesc *fdp = p->p_fd; 1345 struct file *fp; 1346 struct vnode *vp; 1347 off_t offset; 1348 int error, fd = SCARG(uap, fd); 1349 1350 if ((u_int)fd >= fdp->fd_nfiles || 1351 (fp = fdp->fd_ofiles[fd]) == NULL || 1352 (fp->f_flag & FREAD) == 0) 1353 return (EBADF); 1354 1355 vp = (struct vnode *)fp->f_data; 1356 if (fp->f_type != DTYPE_VNODE 1357 || vp->v_type == VFIFO) 1358 return (ESPIPE); 1359 1360 offset = SCARG(uap, offset); 1361 1362 /* 1363 * XXX This works because no file systems actually 1364 * XXX take any action on the seek operation. 1365 */ 1366 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1367 return (error); 1368 1369 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1370 &offset, 0, retval)); 1371 } 1372 1373 /* 1374 * Positional scatter read system call. 1375 */ 1376 int 1377 sys_preadv(p, v, retval) 1378 struct proc *p; 1379 void *v; 1380 register_t *retval; 1381 { 1382 struct sys_preadv_args /* { 1383 syscallarg(int) fd; 1384 syscallarg(const struct iovec *) iovp; 1385 syscallarg(int) iovcnt; 1386 syscallarg(off_t) offset; 1387 } */ *uap = v; 1388 struct filedesc *fdp = p->p_fd; 1389 struct file *fp; 1390 struct vnode *vp; 1391 off_t offset; 1392 int error, fd = SCARG(uap, fd); 1393 1394 if ((u_int)fd >= fdp->fd_nfiles || 1395 (fp = fdp->fd_ofiles[fd]) == NULL || 1396 (fp->f_flag & FREAD) == 0) 1397 return (EBADF); 1398 1399 vp = (struct vnode *)fp->f_data; 1400 if (fp->f_type != DTYPE_VNODE 1401 || vp->v_type == VFIFO) 1402 return (ESPIPE); 1403 1404 offset = SCARG(uap, offset); 1405 1406 /* 1407 * XXX This works because no file systems actually 1408 * XXX take any action on the seek operation. 1409 */ 1410 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1411 return (error); 1412 1413 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1414 &offset, 0, retval)); 1415 } 1416 1417 /* 1418 * Positional write system call. 1419 */ 1420 int 1421 sys_pwrite(p, v, retval) 1422 struct proc *p; 1423 void *v; 1424 register_t *retval; 1425 { 1426 struct sys_pwrite_args /* { 1427 syscallarg(int) fd; 1428 syscallarg(const void *) buf; 1429 syscallarg(size_t) nbyte; 1430 syscallarg(off_t) offset; 1431 } */ *uap = v; 1432 struct filedesc *fdp = p->p_fd; 1433 struct file *fp; 1434 struct vnode *vp; 1435 off_t offset; 1436 int error, fd = SCARG(uap, fd); 1437 1438 if ((u_int)fd >= fdp->fd_nfiles || 1439 (fp = fdp->fd_ofiles[fd]) == NULL || 1440 (fp->f_flag & FWRITE) == 0) 1441 return (EBADF); 1442 1443 vp = (struct vnode *)fp->f_data; 1444 if (fp->f_type != DTYPE_VNODE 1445 || vp->v_type == VFIFO) 1446 return (ESPIPE); 1447 1448 offset = SCARG(uap, offset); 1449 1450 /* 1451 * XXX This works because no file systems actually 1452 * XXX take any action on the seek operation. 1453 */ 1454 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1455 return (error); 1456 1457 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1458 &offset, 0, retval)); 1459 } 1460 1461 /* 1462 * Positional gather write system call. 1463 */ 1464 int 1465 sys_pwritev(p, v, retval) 1466 struct proc *p; 1467 void *v; 1468 register_t *retval; 1469 { 1470 struct sys_pwritev_args /* { 1471 syscallarg(int) fd; 1472 syscallarg(const struct iovec *) iovp; 1473 syscallarg(int) iovcnt; 1474 syscallarg(off_t) offset; 1475 } */ *uap = v; 1476 struct filedesc *fdp = p->p_fd; 1477 struct file *fp; 1478 struct vnode *vp; 1479 off_t offset; 1480 int error, fd = SCARG(uap, fd); 1481 1482 if ((u_int)fd >= fdp->fd_nfiles || 1483 (fp = fdp->fd_ofiles[fd]) == NULL || 1484 (fp->f_flag & FWRITE) == 0) 1485 return (EBADF); 1486 1487 vp = (struct vnode *)fp->f_data; 1488 if (fp->f_type != DTYPE_VNODE 1489 || vp->v_type == VFIFO) 1490 return (ESPIPE); 1491 1492 offset = SCARG(uap, offset); 1493 1494 /* 1495 * XXX This works because no file systems actually 1496 * XXX take any action on the seek operation. 1497 */ 1498 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1499 return (error); 1500 1501 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1502 &offset, 0, retval)); 1503 } 1504 1505 /* 1506 * Check access permissions. 1507 */ 1508 int 1509 sys_access(p, v, retval) 1510 struct proc *p; 1511 void *v; 1512 register_t *retval; 1513 { 1514 register struct sys_access_args /* { 1515 syscallarg(const char *) path; 1516 syscallarg(int) flags; 1517 } */ *uap = v; 1518 register struct ucred *cred = p->p_ucred; 1519 register struct vnode *vp; 1520 int error, flags, t_gid, t_uid; 1521 struct nameidata nd; 1522 1523 t_uid = cred->cr_uid; 1524 t_gid = cred->cr_gid; 1525 cred->cr_uid = p->p_cred->p_ruid; 1526 cred->cr_gid = p->p_cred->p_rgid; 1527 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1528 SCARG(uap, path), p); 1529 if ((error = namei(&nd)) != 0) 1530 goto out1; 1531 vp = nd.ni_vp; 1532 1533 /* Flags == 0 means only check for existence. */ 1534 if (SCARG(uap, flags)) { 1535 flags = 0; 1536 if (SCARG(uap, flags) & R_OK) 1537 flags |= VREAD; 1538 if (SCARG(uap, flags) & W_OK) 1539 flags |= VWRITE; 1540 if (SCARG(uap, flags) & X_OK) 1541 flags |= VEXEC; 1542 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1543 error = VOP_ACCESS(vp, flags, cred, p); 1544 } 1545 vput(vp); 1546 out1: 1547 cred->cr_uid = t_uid; 1548 cred->cr_gid = t_gid; 1549 return (error); 1550 } 1551 1552 /* 1553 * Get file status; this version follows links. 1554 */ 1555 /* ARGSUSED */ 1556 int 1557 sys___stat13(p, v, retval) 1558 struct proc *p; 1559 void *v; 1560 register_t *retval; 1561 { 1562 register struct sys___stat13_args /* { 1563 syscallarg(const char *) path; 1564 syscallarg(struct stat *) ub; 1565 } */ *uap = v; 1566 struct stat sb; 1567 int error; 1568 struct nameidata nd; 1569 1570 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1571 SCARG(uap, path), p); 1572 if ((error = namei(&nd)) != 0) 1573 return (error); 1574 error = vn_stat(nd.ni_vp, &sb, p); 1575 vput(nd.ni_vp); 1576 if (error) 1577 return (error); 1578 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1579 return (error); 1580 } 1581 1582 /* 1583 * Get file status; this version does not follow links. 1584 */ 1585 /* ARGSUSED */ 1586 int 1587 sys___lstat13(p, v, retval) 1588 struct proc *p; 1589 void *v; 1590 register_t *retval; 1591 { 1592 register struct sys___lstat13_args /* { 1593 syscallarg(const char *) path; 1594 syscallarg(struct stat *) ub; 1595 } */ *uap = v; 1596 struct stat sb; 1597 int error; 1598 struct nameidata nd; 1599 1600 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1601 SCARG(uap, path), p); 1602 if ((error = namei(&nd)) != 0) 1603 return (error); 1604 error = vn_stat(nd.ni_vp, &sb, p); 1605 vput(nd.ni_vp); 1606 if (error) 1607 return (error); 1608 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1609 return (error); 1610 } 1611 1612 /* 1613 * Get configurable pathname variables. 1614 */ 1615 /* ARGSUSED */ 1616 int 1617 sys_pathconf(p, v, retval) 1618 struct proc *p; 1619 void *v; 1620 register_t *retval; 1621 { 1622 register struct sys_pathconf_args /* { 1623 syscallarg(const char *) path; 1624 syscallarg(int) name; 1625 } */ *uap = v; 1626 int error; 1627 struct nameidata nd; 1628 1629 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1630 SCARG(uap, path), p); 1631 if ((error = namei(&nd)) != 0) 1632 return (error); 1633 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1634 vput(nd.ni_vp); 1635 return (error); 1636 } 1637 1638 /* 1639 * Return target name of a symbolic link. 1640 */ 1641 /* ARGSUSED */ 1642 int 1643 sys_readlink(p, v, retval) 1644 struct proc *p; 1645 void *v; 1646 register_t *retval; 1647 { 1648 register struct sys_readlink_args /* { 1649 syscallarg(const char *) path; 1650 syscallarg(char *) buf; 1651 syscallarg(size_t) count; 1652 } */ *uap = v; 1653 register struct vnode *vp; 1654 struct iovec aiov; 1655 struct uio auio; 1656 int error; 1657 struct nameidata nd; 1658 1659 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1660 SCARG(uap, path), p); 1661 if ((error = namei(&nd)) != 0) 1662 return (error); 1663 vp = nd.ni_vp; 1664 if (vp->v_type != VLNK) 1665 error = EINVAL; 1666 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1667 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1668 aiov.iov_base = SCARG(uap, buf); 1669 aiov.iov_len = SCARG(uap, count); 1670 auio.uio_iov = &aiov; 1671 auio.uio_iovcnt = 1; 1672 auio.uio_offset = 0; 1673 auio.uio_rw = UIO_READ; 1674 auio.uio_segflg = UIO_USERSPACE; 1675 auio.uio_procp = p; 1676 auio.uio_resid = SCARG(uap, count); 1677 error = VOP_READLINK(vp, &auio, p->p_ucred); 1678 } 1679 vput(vp); 1680 *retval = SCARG(uap, count) - auio.uio_resid; 1681 return (error); 1682 } 1683 1684 /* 1685 * Change flags of a file given a path name. 1686 */ 1687 /* ARGSUSED */ 1688 int 1689 sys_chflags(p, v, retval) 1690 struct proc *p; 1691 void *v; 1692 register_t *retval; 1693 { 1694 register struct sys_chflags_args /* { 1695 syscallarg(const char *) path; 1696 syscallarg(u_long) flags; 1697 } */ *uap = v; 1698 register struct vnode *vp; 1699 struct vattr vattr; 1700 int error; 1701 struct nameidata nd; 1702 1703 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1704 if ((error = namei(&nd)) != 0) 1705 return (error); 1706 vp = nd.ni_vp; 1707 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1708 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1709 VATTR_NULL(&vattr); 1710 vattr.va_flags = SCARG(uap, flags); 1711 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1712 vput(vp); 1713 return (error); 1714 } 1715 1716 /* 1717 * Change flags of a file given a file descriptor. 1718 */ 1719 /* ARGSUSED */ 1720 int 1721 sys_fchflags(p, v, retval) 1722 struct proc *p; 1723 void *v; 1724 register_t *retval; 1725 { 1726 register struct sys_fchflags_args /* { 1727 syscallarg(int) fd; 1728 syscallarg(u_long) flags; 1729 } */ *uap = v; 1730 struct vattr vattr; 1731 struct vnode *vp; 1732 struct file *fp; 1733 int error; 1734 1735 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1736 return (error); 1737 vp = (struct vnode *)fp->f_data; 1738 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1739 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1740 VATTR_NULL(&vattr); 1741 vattr.va_flags = SCARG(uap, flags); 1742 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1743 VOP_UNLOCK(vp, 0); 1744 return (error); 1745 } 1746 1747 /* 1748 * Change mode of a file given path name; this version follows links. 1749 */ 1750 /* ARGSUSED */ 1751 int 1752 sys_chmod(p, v, retval) 1753 struct proc *p; 1754 void *v; 1755 register_t *retval; 1756 { 1757 register struct sys_chmod_args /* { 1758 syscallarg(const char *) path; 1759 syscallarg(int) mode; 1760 } */ *uap = v; 1761 int error; 1762 struct nameidata nd; 1763 1764 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1765 if ((error = namei(&nd)) != 0) 1766 return (error); 1767 1768 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1769 1770 vrele(nd.ni_vp); 1771 return (error); 1772 } 1773 1774 /* 1775 * Change mode of a file given a file descriptor. 1776 */ 1777 /* ARGSUSED */ 1778 int 1779 sys_fchmod(p, v, retval) 1780 struct proc *p; 1781 void *v; 1782 register_t *retval; 1783 { 1784 register struct sys_fchmod_args /* { 1785 syscallarg(int) fd; 1786 syscallarg(int) mode; 1787 } */ *uap = v; 1788 struct file *fp; 1789 int error; 1790 1791 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1792 return (error); 1793 1794 return (change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p)); 1795 } 1796 1797 /* 1798 * Change mode of a file given path name; this version does not follow links. 1799 */ 1800 /* ARGSUSED */ 1801 int 1802 sys_lchmod(p, v, retval) 1803 struct proc *p; 1804 void *v; 1805 register_t *retval; 1806 { 1807 register struct sys_lchmod_args /* { 1808 syscallarg(const char *) path; 1809 syscallarg(int) mode; 1810 } */ *uap = v; 1811 int error; 1812 struct nameidata nd; 1813 1814 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1815 if ((error = namei(&nd)) != 0) 1816 return (error); 1817 1818 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1819 1820 vrele(nd.ni_vp); 1821 return (error); 1822 } 1823 1824 /* 1825 * Common routine to set mode given a vnode. 1826 */ 1827 static int 1828 change_mode(vp, mode, p) 1829 struct vnode *vp; 1830 int mode; 1831 struct proc *p; 1832 { 1833 struct vattr vattr; 1834 int error; 1835 1836 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1837 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1838 VATTR_NULL(&vattr); 1839 vattr.va_mode = mode & ALLPERMS; 1840 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1841 VOP_UNLOCK(vp, 0); 1842 return (error); 1843 } 1844 1845 /* 1846 * Set ownership given a path name; this version follows links. 1847 */ 1848 /* ARGSUSED */ 1849 int 1850 sys_chown(p, v, retval) 1851 struct proc *p; 1852 void *v; 1853 register_t *retval; 1854 { 1855 register struct sys_chown_args /* { 1856 syscallarg(const char *) path; 1857 syscallarg(uid_t) uid; 1858 syscallarg(gid_t) gid; 1859 } */ *uap = v; 1860 int error; 1861 struct nameidata nd; 1862 1863 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1864 if ((error = namei(&nd)) != 0) 1865 return (error); 1866 1867 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1868 1869 vrele(nd.ni_vp); 1870 return (error); 1871 } 1872 1873 /* 1874 * Set ownership given a path name; this version follows links. 1875 * Provides POSIX semantics. 1876 */ 1877 /* ARGSUSED */ 1878 int 1879 sys___posix_chown(p, v, retval) 1880 struct proc *p; 1881 void *v; 1882 register_t *retval; 1883 { 1884 register struct sys_chown_args /* { 1885 syscallarg(const char *) path; 1886 syscallarg(uid_t) uid; 1887 syscallarg(gid_t) gid; 1888 } */ *uap = v; 1889 int error; 1890 struct nameidata nd; 1891 1892 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1893 if ((error = namei(&nd)) != 0) 1894 return (error); 1895 1896 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 1897 1898 vrele(nd.ni_vp); 1899 return (error); 1900 } 1901 1902 /* 1903 * Set ownership given a file descriptor. 1904 */ 1905 /* ARGSUSED */ 1906 int 1907 sys_fchown(p, v, retval) 1908 struct proc *p; 1909 void *v; 1910 register_t *retval; 1911 { 1912 register struct sys_fchown_args /* { 1913 syscallarg(int) fd; 1914 syscallarg(uid_t) uid; 1915 syscallarg(gid_t) gid; 1916 } */ *uap = v; 1917 int error; 1918 struct file *fp; 1919 1920 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1921 return (error); 1922 1923 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1924 SCARG(uap, gid), p, 0)); 1925 } 1926 1927 /* 1928 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 1929 */ 1930 /* ARGSUSED */ 1931 int 1932 sys___posix_fchown(p, v, retval) 1933 struct proc *p; 1934 void *v; 1935 register_t *retval; 1936 { 1937 register struct sys_fchown_args /* { 1938 syscallarg(int) fd; 1939 syscallarg(uid_t) uid; 1940 syscallarg(gid_t) gid; 1941 } */ *uap = v; 1942 int error; 1943 struct file *fp; 1944 1945 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1946 return (error); 1947 1948 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1949 SCARG(uap, gid), p, 1)); 1950 } 1951 1952 /* 1953 * Set ownership given a path name; this version does not follow links. 1954 */ 1955 /* ARGSUSED */ 1956 int 1957 sys_lchown(p, v, retval) 1958 struct proc *p; 1959 void *v; 1960 register_t *retval; 1961 { 1962 register struct sys_lchown_args /* { 1963 syscallarg(const char *) path; 1964 syscallarg(uid_t) uid; 1965 syscallarg(gid_t) gid; 1966 } */ *uap = v; 1967 int error; 1968 struct nameidata nd; 1969 1970 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1971 if ((error = namei(&nd)) != 0) 1972 return (error); 1973 1974 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1975 1976 vrele(nd.ni_vp); 1977 return (error); 1978 } 1979 1980 /* 1981 * Set ownership given a path name; this version does not follow links. 1982 * Provides POSIX/XPG semantics. 1983 */ 1984 /* ARGSUSED */ 1985 int 1986 sys___posix_lchown(p, v, retval) 1987 struct proc *p; 1988 void *v; 1989 register_t *retval; 1990 { 1991 register struct sys_lchown_args /* { 1992 syscallarg(const char *) path; 1993 syscallarg(uid_t) uid; 1994 syscallarg(gid_t) gid; 1995 } */ *uap = v; 1996 int error; 1997 struct nameidata nd; 1998 1999 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2000 if ((error = namei(&nd)) != 0) 2001 return (error); 2002 2003 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2004 2005 vrele(nd.ni_vp); 2006 return (error); 2007 } 2008 2009 /* 2010 * Common routine to set ownership given a vnode. 2011 */ 2012 static int 2013 change_owner(vp, uid, gid, p, posix_semantics) 2014 register struct vnode *vp; 2015 uid_t uid; 2016 gid_t gid; 2017 struct proc *p; 2018 int posix_semantics; 2019 { 2020 struct vattr vattr; 2021 mode_t newmode; 2022 int error; 2023 2024 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2025 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2026 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2027 goto out; 2028 2029 #define CHANGED(x) ((x) != -1) 2030 newmode = vattr.va_mode; 2031 if (posix_semantics) { 2032 /* 2033 * POSIX/XPG semantics: if the caller is not the super-user, 2034 * clear set-user-id and set-group-id bits. Both POSIX and 2035 * the XPG consider the behaviour for calls by the super-user 2036 * implementation-defined; we leave the set-user-id and set- 2037 * group-id settings intact in that case. 2038 */ 2039 if (suser(p->p_ucred, NULL) != 0) 2040 newmode &= ~(S_ISUID | S_ISGID); 2041 } else { 2042 /* 2043 * NetBSD semantics: when changing owner and/or group, 2044 * clear the respective bit(s). 2045 */ 2046 if (CHANGED(uid)) 2047 newmode &= ~S_ISUID; 2048 if (CHANGED(gid)) 2049 newmode &= ~S_ISGID; 2050 } 2051 /* Update va_mode iff altered. */ 2052 if (vattr.va_mode == newmode) 2053 newmode = VNOVAL; 2054 2055 VATTR_NULL(&vattr); 2056 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2057 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2058 vattr.va_mode = newmode; 2059 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2060 #undef CHANGED 2061 2062 out: 2063 VOP_UNLOCK(vp, 0); 2064 return (error); 2065 } 2066 2067 /* 2068 * Set the access and modification times given a path name; this 2069 * version follows links. 2070 */ 2071 /* ARGSUSED */ 2072 int 2073 sys_utimes(p, v, retval) 2074 struct proc *p; 2075 void *v; 2076 register_t *retval; 2077 { 2078 register struct sys_utimes_args /* { 2079 syscallarg(const char *) path; 2080 syscallarg(const struct timeval *) tptr; 2081 } */ *uap = v; 2082 int error; 2083 struct nameidata nd; 2084 2085 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2086 if ((error = namei(&nd)) != 0) 2087 return (error); 2088 2089 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2090 2091 vrele(nd.ni_vp); 2092 return (error); 2093 } 2094 2095 /* 2096 * Set the access and modification times given a file descriptor. 2097 */ 2098 /* ARGSUSED */ 2099 int 2100 sys_futimes(p, v, retval) 2101 struct proc *p; 2102 void *v; 2103 register_t *retval; 2104 { 2105 register struct sys_futimes_args /* { 2106 syscallarg(int) fd; 2107 syscallarg(const struct timeval *) tptr; 2108 } */ *uap = v; 2109 int error; 2110 struct file *fp; 2111 2112 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2113 return (error); 2114 2115 return (change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), 2116 p)); 2117 } 2118 2119 /* 2120 * Set the access and modification times given a path name; this 2121 * version does not follow links. 2122 */ 2123 /* ARGSUSED */ 2124 int 2125 sys_lutimes(p, v, retval) 2126 struct proc *p; 2127 void *v; 2128 register_t *retval; 2129 { 2130 register struct sys_lutimes_args /* { 2131 syscallarg(const char *) path; 2132 syscallarg(const struct timeval *) tptr; 2133 } */ *uap = v; 2134 int error; 2135 struct nameidata nd; 2136 2137 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2138 if ((error = namei(&nd)) != 0) 2139 return (error); 2140 2141 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2142 2143 vrele(nd.ni_vp); 2144 return (error); 2145 } 2146 2147 /* 2148 * Common routine to set access and modification times given a vnode. 2149 */ 2150 static int 2151 change_utimes(vp, tptr, p) 2152 struct vnode *vp; 2153 const struct timeval *tptr; 2154 struct proc *p; 2155 { 2156 struct timeval tv[2]; 2157 struct vattr vattr; 2158 int error; 2159 2160 VATTR_NULL(&vattr); 2161 if (tptr == NULL) { 2162 microtime(&tv[0]); 2163 tv[1] = tv[0]; 2164 vattr.va_vaflags |= VA_UTIMES_NULL; 2165 } else { 2166 error = copyin(tptr, tv, sizeof(tv)); 2167 if (error) 2168 return (error); 2169 } 2170 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2171 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2172 vattr.va_atime.tv_sec = tv[0].tv_sec; 2173 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2174 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2175 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2176 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2177 VOP_UNLOCK(vp, 0); 2178 return (error); 2179 } 2180 2181 /* 2182 * Truncate a file given its path name. 2183 */ 2184 /* ARGSUSED */ 2185 int 2186 sys_truncate(p, v, retval) 2187 struct proc *p; 2188 void *v; 2189 register_t *retval; 2190 { 2191 register struct sys_truncate_args /* { 2192 syscallarg(const char *) path; 2193 syscallarg(int) pad; 2194 syscallarg(off_t) length; 2195 } */ *uap = v; 2196 register struct vnode *vp; 2197 struct vattr vattr; 2198 int error; 2199 struct nameidata nd; 2200 2201 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2202 if ((error = namei(&nd)) != 0) 2203 return (error); 2204 vp = nd.ni_vp; 2205 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2206 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2207 if (vp->v_type == VDIR) 2208 error = EISDIR; 2209 else if ((error = vn_writechk(vp)) == 0 && 2210 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2211 VATTR_NULL(&vattr); 2212 vattr.va_size = SCARG(uap, length); 2213 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2214 } 2215 vput(vp); 2216 return (error); 2217 } 2218 2219 /* 2220 * Truncate a file given a file descriptor. 2221 */ 2222 /* ARGSUSED */ 2223 int 2224 sys_ftruncate(p, v, retval) 2225 struct proc *p; 2226 void *v; 2227 register_t *retval; 2228 { 2229 register struct sys_ftruncate_args /* { 2230 syscallarg(int) fd; 2231 syscallarg(int) pad; 2232 syscallarg(off_t) length; 2233 } */ *uap = v; 2234 struct vattr vattr; 2235 struct vnode *vp; 2236 struct file *fp; 2237 int error; 2238 2239 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2240 return (error); 2241 if ((fp->f_flag & FWRITE) == 0) 2242 return (EINVAL); 2243 vp = (struct vnode *)fp->f_data; 2244 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2245 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2246 if (vp->v_type == VDIR) 2247 error = EISDIR; 2248 else if ((error = vn_writechk(vp)) == 0) { 2249 VATTR_NULL(&vattr); 2250 vattr.va_size = SCARG(uap, length); 2251 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2252 } 2253 VOP_UNLOCK(vp, 0); 2254 return (error); 2255 } 2256 2257 /* 2258 * Sync an open file. 2259 */ 2260 /* ARGSUSED */ 2261 int 2262 sys_fsync(p, v, retval) 2263 struct proc *p; 2264 void *v; 2265 register_t *retval; 2266 { 2267 struct sys_fsync_args /* { 2268 syscallarg(int) fd; 2269 } */ *uap = v; 2270 register struct vnode *vp; 2271 struct file *fp; 2272 int error; 2273 2274 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2275 return (error); 2276 vp = (struct vnode *)fp->f_data; 2277 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2278 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2279 VOP_UNLOCK(vp, 0); 2280 return (error); 2281 } 2282 2283 /* 2284 * Sync the data of an open file. 2285 */ 2286 /* ARGSUSED */ 2287 int 2288 sys_fdatasync(p, v, retval) 2289 struct proc *p; 2290 void *v; 2291 register_t *retval; 2292 { 2293 struct sys_fdatasync_args /* { 2294 syscallarg(int) fd; 2295 } */ *uap = v; 2296 struct vnode *vp; 2297 struct file *fp; 2298 int error; 2299 2300 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2301 return (error); 2302 vp = (struct vnode *)fp->f_data; 2303 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2304 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2305 VOP_UNLOCK(vp, 0); 2306 return (error); 2307 } 2308 2309 /* 2310 * Rename files, (standard) BSD semantics frontend. 2311 */ 2312 /* ARGSUSED */ 2313 int 2314 sys_rename(p, v, retval) 2315 struct proc *p; 2316 void *v; 2317 register_t *retval; 2318 { 2319 register struct sys_rename_args /* { 2320 syscallarg(const char *) from; 2321 syscallarg(const char *) to; 2322 } */ *uap = v; 2323 2324 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2325 } 2326 2327 /* 2328 * Rename files, POSIX semantics frontend. 2329 */ 2330 /* ARGSUSED */ 2331 int 2332 sys___posix_rename(p, v, retval) 2333 struct proc *p; 2334 void *v; 2335 register_t *retval; 2336 { 2337 register struct sys___posix_rename_args /* { 2338 syscallarg(const char *) from; 2339 syscallarg(const char *) to; 2340 } */ *uap = v; 2341 2342 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2343 } 2344 2345 /* 2346 * Rename files. Source and destination must either both be directories, 2347 * or both not be directories. If target is a directory, it must be empty. 2348 * If `from' and `to' refer to the same object, the value of the `retain' 2349 * argument is used to determine whether `from' will be 2350 * 2351 * (retain == 0) deleted unless `from' and `to' refer to the same 2352 * object in the file system's name space (BSD). 2353 * (retain == 1) always retained (POSIX). 2354 */ 2355 static int 2356 rename_files(from, to, p, retain) 2357 const char *from, *to; 2358 struct proc *p; 2359 int retain; 2360 { 2361 register struct vnode *tvp, *fvp, *tdvp; 2362 struct nameidata fromnd, tond; 2363 int error; 2364 2365 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2366 from, p); 2367 if ((error = namei(&fromnd)) != 0) 2368 return (error); 2369 fvp = fromnd.ni_vp; 2370 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2371 UIO_USERSPACE, to, p); 2372 if ((error = namei(&tond)) != 0) { 2373 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2374 vrele(fromnd.ni_dvp); 2375 vrele(fvp); 2376 goto out1; 2377 } 2378 tdvp = tond.ni_dvp; 2379 tvp = tond.ni_vp; 2380 2381 if (tvp != NULL) { 2382 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2383 error = ENOTDIR; 2384 goto out; 2385 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2386 error = EISDIR; 2387 goto out; 2388 } 2389 } 2390 2391 if (fvp == tdvp) 2392 error = EINVAL; 2393 2394 /* 2395 * Source and destination refer to the same object. 2396 */ 2397 if (fvp == tvp) { 2398 if (retain) 2399 error = -1; 2400 else if (fromnd.ni_dvp == tdvp && 2401 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2402 !memcmp(fromnd.ni_cnd.cn_nameptr, 2403 tond.ni_cnd.cn_nameptr, 2404 fromnd.ni_cnd.cn_namelen)) 2405 error = -1; 2406 } 2407 2408 out: 2409 if (!error) { 2410 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2411 if (fromnd.ni_dvp != tdvp) 2412 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2413 if (tvp) { 2414 (void)uvm_vnp_uncache(tvp); 2415 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2416 } 2417 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2418 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2419 } else { 2420 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2421 if (tdvp == tvp) 2422 vrele(tdvp); 2423 else 2424 vput(tdvp); 2425 if (tvp) 2426 vput(tvp); 2427 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2428 vrele(fromnd.ni_dvp); 2429 vrele(fvp); 2430 } 2431 vrele(tond.ni_startdir); 2432 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2433 out1: 2434 if (fromnd.ni_startdir) 2435 vrele(fromnd.ni_startdir); 2436 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2437 return (error == -1 ? 0 : error); 2438 } 2439 2440 /* 2441 * Make a directory file. 2442 */ 2443 /* ARGSUSED */ 2444 int 2445 sys_mkdir(p, v, retval) 2446 struct proc *p; 2447 void *v; 2448 register_t *retval; 2449 { 2450 register struct sys_mkdir_args /* { 2451 syscallarg(const char *) path; 2452 syscallarg(int) mode; 2453 } */ *uap = v; 2454 register struct vnode *vp; 2455 struct vattr vattr; 2456 int error; 2457 struct nameidata nd; 2458 2459 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2460 if ((error = namei(&nd)) != 0) 2461 return (error); 2462 vp = nd.ni_vp; 2463 if (vp != NULL) { 2464 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2465 if (nd.ni_dvp == vp) 2466 vrele(nd.ni_dvp); 2467 else 2468 vput(nd.ni_dvp); 2469 vrele(vp); 2470 return (EEXIST); 2471 } 2472 VATTR_NULL(&vattr); 2473 vattr.va_type = VDIR; 2474 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 2475 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2476 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2477 if (!error) 2478 vput(nd.ni_vp); 2479 return (error); 2480 } 2481 2482 /* 2483 * Remove a directory file. 2484 */ 2485 /* ARGSUSED */ 2486 int 2487 sys_rmdir(p, v, retval) 2488 struct proc *p; 2489 void *v; 2490 register_t *retval; 2491 { 2492 struct sys_rmdir_args /* { 2493 syscallarg(const char *) path; 2494 } */ *uap = v; 2495 register struct vnode *vp; 2496 int error; 2497 struct nameidata nd; 2498 2499 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2500 SCARG(uap, path), p); 2501 if ((error = namei(&nd)) != 0) 2502 return (error); 2503 vp = nd.ni_vp; 2504 if (vp->v_type != VDIR) { 2505 error = ENOTDIR; 2506 goto out; 2507 } 2508 /* 2509 * No rmdir "." please. 2510 */ 2511 if (nd.ni_dvp == vp) { 2512 error = EINVAL; 2513 goto out; 2514 } 2515 /* 2516 * The root of a mounted filesystem cannot be deleted. 2517 */ 2518 if (vp->v_flag & VROOT) 2519 error = EBUSY; 2520 out: 2521 if (!error) { 2522 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2523 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2524 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2525 } else { 2526 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2527 if (nd.ni_dvp == vp) 2528 vrele(nd.ni_dvp); 2529 else 2530 vput(nd.ni_dvp); 2531 vput(vp); 2532 } 2533 return (error); 2534 } 2535 2536 /* 2537 * Read a block of directory entries in a file system independent format. 2538 */ 2539 int 2540 sys_getdents(p, v, retval) 2541 struct proc *p; 2542 void *v; 2543 register_t *retval; 2544 { 2545 register struct sys_getdents_args /* { 2546 syscallarg(int) fd; 2547 syscallarg(char *) buf; 2548 syscallarg(size_t) count; 2549 } */ *uap = v; 2550 struct file *fp; 2551 int error, done; 2552 2553 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2554 return (error); 2555 if ((fp->f_flag & FREAD) == 0) 2556 return (EBADF); 2557 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2558 SCARG(uap, count), &done, p, 0, 0); 2559 *retval = done; 2560 return (error); 2561 } 2562 2563 /* 2564 * Set the mode mask for creation of filesystem nodes. 2565 */ 2566 int 2567 sys_umask(p, v, retval) 2568 struct proc *p; 2569 void *v; 2570 register_t *retval; 2571 { 2572 struct sys_umask_args /* { 2573 syscallarg(mode_t) newmask; 2574 } */ *uap = v; 2575 register struct filedesc *fdp; 2576 2577 fdp = p->p_fd; 2578 *retval = fdp->fd_cmask; 2579 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2580 return (0); 2581 } 2582 2583 /* 2584 * Void all references to file by ripping underlying filesystem 2585 * away from vnode. 2586 */ 2587 /* ARGSUSED */ 2588 int 2589 sys_revoke(p, v, retval) 2590 struct proc *p; 2591 void *v; 2592 register_t *retval; 2593 { 2594 register struct sys_revoke_args /* { 2595 syscallarg(const char *) path; 2596 } */ *uap = v; 2597 register struct vnode *vp; 2598 struct vattr vattr; 2599 int error; 2600 struct nameidata nd; 2601 2602 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2603 if ((error = namei(&nd)) != 0) 2604 return (error); 2605 vp = nd.ni_vp; 2606 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2607 goto out; 2608 if (p->p_ucred->cr_uid != vattr.va_uid && 2609 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2610 goto out; 2611 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2612 VOP_REVOKE(vp, REVOKEALL); 2613 out: 2614 vrele(vp); 2615 return (error); 2616 } 2617 2618 /* 2619 * Convert a user file descriptor to a kernel file entry. 2620 */ 2621 int 2622 getvnode(fdp, fd, fpp) 2623 struct filedesc *fdp; 2624 int fd; 2625 struct file **fpp; 2626 { 2627 struct vnode *vp; 2628 struct file *fp; 2629 2630 if ((u_int)fd >= fdp->fd_nfiles || 2631 (fp = fdp->fd_ofiles[fd]) == NULL) 2632 return (EBADF); 2633 if (fp->f_type != DTYPE_VNODE) 2634 return (EINVAL); 2635 vp = (struct vnode *)fp->f_data; 2636 if (vp->v_type == VBAD) 2637 return (EBADF); 2638 *fpp = fp; 2639 return (0); 2640 } 2641
Indexes created Fri Oct 03 02:09:57 GMT 2025