vfs_syscalls.c revision 1.134
1 /* $NetBSD: vfs_syscalls.c,v 1.134 1999/04/30 18:43:01 thorpej 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 cwdinfo *cwdi; 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 cwdi = p->p_cwdi; 366 if (cwdi->cwdi_cdir == olddp) { 367 vrele(cwdi->cwdi_cdir); 368 VREF(newdp); 369 cwdi->cwdi_cdir = newdp; 370 } 371 if (cwdi->cwdi_rdir == olddp) { 372 vrele(cwdi->cwdi_rdir); 373 VREF(newdp); 374 cwdi->cwdi_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 struct filedesc *fdp = p->p_fd; 707 struct cwdinfo *cwdi = p->p_cwdi; 708 struct vnode *vp, *tdp; 709 struct mount *mp; 710 struct file *fp; 711 int error; 712 713 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 714 return (error); 715 vp = (struct vnode *)fp->f_data; 716 717 VREF(vp); 718 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 719 if (vp->v_type != VDIR) 720 error = ENOTDIR; 721 else 722 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 723 while (!error && (mp = vp->v_mountedhere) != NULL) { 724 if (vfs_busy(mp, 0, 0)) 725 continue; 726 error = VFS_ROOT(mp, &tdp); 727 vfs_unbusy(mp); 728 if (error) 729 break; 730 vput(vp); 731 vp = tdp; 732 } 733 if (error) { 734 vput(vp); 735 return (error); 736 } 737 VOP_UNLOCK(vp, 0); 738 739 /* 740 * Disallow changing to a directory not under the process's 741 * current root directory (if there is one). 742 */ 743 if (cwdi->cwdi_rdir && 744 !vn_isunder(vp, NULL, p)) { 745 vrele(vp); 746 return EPERM; /* operation not permitted */ 747 } 748 749 vrele(cwdi->cwdi_cdir); 750 cwdi->cwdi_cdir = vp; 751 return (0); 752 } 753 754 /* 755 * Change this process's notion of the root directory to a given file descriptor. 756 */ 757 758 int 759 sys_fchroot(p, v, retval) 760 struct proc *p; 761 void *v; 762 register_t *retval; 763 { 764 struct sys_fchroot_args *uap = v; 765 struct filedesc *fdp = p->p_fd; 766 struct cwdinfo *cwdi = p->p_cwdi; 767 struct vnode *vp; 768 struct file *fp; 769 int error; 770 771 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 772 return error; 773 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 774 return error; 775 vp = (struct vnode *) fp->f_data; 776 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 777 if (vp->v_type != VDIR) 778 error = ENOTDIR; 779 else 780 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 781 VOP_UNLOCK(vp, 0); 782 if (error) 783 return error; 784 VREF(vp); 785 786 /* 787 * Prevent escaping from chroot by putting the root under 788 * the working directory. Silently chdir to / if we aren't 789 * already there. 790 */ 791 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 792 /* 793 * XXX would be more failsafe to change directory to a 794 * deadfs node here instead 795 */ 796 vrele(cwdi->cwdi_cdir); 797 VREF(vp); 798 cwdi->cwdi_cdir = vp; 799 } 800 801 if (cwdi->cwdi_rdir != NULL) 802 vrele(cwdi->cwdi_rdir); 803 cwdi->cwdi_rdir = vp; 804 return 0; 805 } 806 807 808 809 /* 810 * Change current working directory (``.''). 811 */ 812 /* ARGSUSED */ 813 int 814 sys_chdir(p, v, retval) 815 struct proc *p; 816 void *v; 817 register_t *retval; 818 { 819 struct sys_chdir_args /* { 820 syscallarg(const char *) path; 821 } */ *uap = v; 822 struct cwdinfo *cwdi = p->p_cwdi; 823 int error; 824 struct nameidata nd; 825 826 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 827 SCARG(uap, path), p); 828 if ((error = change_dir(&nd, p)) != 0) 829 return (error); 830 vrele(cwdi->cwdi_cdir); 831 cwdi->cwdi_cdir = nd.ni_vp; 832 return (0); 833 } 834 835 /* 836 * Change notion of root (``/'') directory. 837 */ 838 /* ARGSUSED */ 839 int 840 sys_chroot(p, v, retval) 841 struct proc *p; 842 void *v; 843 register_t *retval; 844 { 845 struct sys_chroot_args /* { 846 syscallarg(const char *) path; 847 } */ *uap = v; 848 struct cwdinfo *cwdi = p->p_cwdi; 849 struct vnode *vp; 850 int error; 851 struct nameidata nd; 852 853 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 854 return (error); 855 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 856 SCARG(uap, path), p); 857 if ((error = change_dir(&nd, p)) != 0) 858 return (error); 859 if (cwdi->cwdi_rdir != NULL) 860 vrele(cwdi->cwdi_rdir); 861 vp = nd.ni_vp; 862 cwdi->cwdi_rdir = vp; 863 864 /* 865 * Prevent escaping from chroot by putting the root under 866 * the working directory. Silently chdir to / if we aren't 867 * already there. 868 */ 869 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 870 /* 871 * XXX would be more failsafe to change directory to a 872 * deadfs node here instead 873 */ 874 vrele(cwdi->cwdi_cdir); 875 VREF(vp); 876 cwdi->cwdi_cdir = vp; 877 } 878 879 return (0); 880 } 881 882 /* 883 * Common routine for chroot and chdir. 884 */ 885 static int 886 change_dir(ndp, p) 887 register struct nameidata *ndp; 888 struct proc *p; 889 { 890 struct vnode *vp; 891 int error; 892 893 if ((error = namei(ndp)) != 0) 894 return (error); 895 vp = ndp->ni_vp; 896 if (vp->v_type != VDIR) 897 error = ENOTDIR; 898 else 899 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 900 901 if (error) 902 vput(vp); 903 else 904 VOP_UNLOCK(vp, 0); 905 return (error); 906 } 907 908 /* 909 * Check permissions, allocate an open file structure, 910 * and call the device open routine if any. 911 */ 912 int 913 sys_open(p, v, retval) 914 struct proc *p; 915 void *v; 916 register_t *retval; 917 { 918 register struct sys_open_args /* { 919 syscallarg(const char *) path; 920 syscallarg(int) flags; 921 syscallarg(int) mode; 922 } */ *uap = v; 923 struct cwdinfo *cwdi = p->p_cwdi; 924 register struct filedesc *fdp = p->p_fd; 925 register struct file *fp; 926 register struct vnode *vp; 927 int flags, cmode; 928 struct file *nfp; 929 int type, indx, error; 930 struct flock lf; 931 struct nameidata nd; 932 extern struct fileops vnops; 933 934 flags = FFLAGS(SCARG(uap, flags)); 935 if ((flags & (FREAD | FWRITE)) == 0) 936 return (EINVAL); 937 if ((error = falloc(p, &nfp, &indx)) != 0) 938 return (error); 939 fp = nfp; 940 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 941 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 942 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 943 if ((error = vn_open(&nd, flags, cmode)) != 0) { 944 ffree(fp); 945 if ((error == ENODEV || error == ENXIO) && 946 p->p_dupfd >= 0 && /* XXX from fdopen */ 947 (error = 948 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 949 *retval = indx; 950 return (0); 951 } 952 if (error == ERESTART) 953 error = EINTR; 954 fdp->fd_ofiles[indx] = NULL; 955 return (error); 956 } 957 p->p_dupfd = 0; 958 vp = nd.ni_vp; 959 fp->f_flag = flags & FMASK; 960 fp->f_type = DTYPE_VNODE; 961 fp->f_ops = &vnops; 962 fp->f_data = (caddr_t)vp; 963 if (flags & (O_EXLOCK | O_SHLOCK)) { 964 lf.l_whence = SEEK_SET; 965 lf.l_start = 0; 966 lf.l_len = 0; 967 if (flags & O_EXLOCK) 968 lf.l_type = F_WRLCK; 969 else 970 lf.l_type = F_RDLCK; 971 type = F_FLOCK; 972 if ((flags & FNONBLOCK) == 0) 973 type |= F_WAIT; 974 VOP_UNLOCK(vp, 0); 975 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 976 if (error) { 977 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 978 ffree(fp); 979 fdp->fd_ofiles[indx] = NULL; 980 return (error); 981 } 982 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 983 fp->f_flag |= FHASLOCK; 984 } 985 VOP_UNLOCK(vp, 0); 986 *retval = indx; 987 return (0); 988 } 989 990 /* 991 * Create a special file. 992 */ 993 /* ARGSUSED */ 994 int 995 sys_mknod(p, v, retval) 996 struct proc *p; 997 void *v; 998 register_t *retval; 999 { 1000 register struct sys_mknod_args /* { 1001 syscallarg(const char *) path; 1002 syscallarg(int) mode; 1003 syscallarg(int) dev; 1004 } */ *uap = v; 1005 register struct vnode *vp; 1006 struct vattr vattr; 1007 int error; 1008 int whiteout = 0; 1009 struct nameidata nd; 1010 1011 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1012 return (error); 1013 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1014 if ((error = namei(&nd)) != 0) 1015 return (error); 1016 vp = nd.ni_vp; 1017 if (vp != NULL) 1018 error = EEXIST; 1019 else { 1020 VATTR_NULL(&vattr); 1021 vattr.va_mode = 1022 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1023 vattr.va_rdev = SCARG(uap, dev); 1024 whiteout = 0; 1025 1026 switch (SCARG(uap, mode) & S_IFMT) { 1027 case S_IFMT: /* used by badsect to flag bad sectors */ 1028 vattr.va_type = VBAD; 1029 break; 1030 case S_IFCHR: 1031 vattr.va_type = VCHR; 1032 break; 1033 case S_IFBLK: 1034 vattr.va_type = VBLK; 1035 break; 1036 case S_IFWHT: 1037 whiteout = 1; 1038 break; 1039 default: 1040 error = EINVAL; 1041 break; 1042 } 1043 } 1044 if (!error) { 1045 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1046 if (whiteout) { 1047 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1048 if (error) 1049 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1050 vput(nd.ni_dvp); 1051 } else { 1052 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1053 &nd.ni_cnd, &vattr); 1054 } 1055 } else { 1056 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1057 if (nd.ni_dvp == vp) 1058 vrele(nd.ni_dvp); 1059 else 1060 vput(nd.ni_dvp); 1061 if (vp) 1062 vrele(vp); 1063 } 1064 return (error); 1065 } 1066 1067 /* 1068 * Create a named pipe. 1069 */ 1070 /* ARGSUSED */ 1071 int 1072 sys_mkfifo(p, v, retval) 1073 struct proc *p; 1074 void *v; 1075 register_t *retval; 1076 { 1077 register struct sys_mkfifo_args /* { 1078 syscallarg(const char *) path; 1079 syscallarg(int) mode; 1080 } */ *uap = v; 1081 struct vattr vattr; 1082 int error; 1083 struct nameidata nd; 1084 1085 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1086 if ((error = namei(&nd)) != 0) 1087 return (error); 1088 if (nd.ni_vp != NULL) { 1089 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1090 if (nd.ni_dvp == nd.ni_vp) 1091 vrele(nd.ni_dvp); 1092 else 1093 vput(nd.ni_dvp); 1094 vrele(nd.ni_vp); 1095 return (EEXIST); 1096 } 1097 VATTR_NULL(&vattr); 1098 vattr.va_type = VFIFO; 1099 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1100 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1101 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1102 } 1103 1104 /* 1105 * Make a hard file link. 1106 */ 1107 /* ARGSUSED */ 1108 int 1109 sys_link(p, v, retval) 1110 struct proc *p; 1111 void *v; 1112 register_t *retval; 1113 { 1114 register struct sys_link_args /* { 1115 syscallarg(const char *) path; 1116 syscallarg(const char *) link; 1117 } */ *uap = v; 1118 register struct vnode *vp; 1119 struct nameidata nd; 1120 int error; 1121 1122 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1123 if ((error = namei(&nd)) != 0) 1124 return (error); 1125 vp = nd.ni_vp; 1126 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1127 if ((error = namei(&nd)) != 0) 1128 goto out; 1129 if (nd.ni_vp) { 1130 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1131 if (nd.ni_dvp == nd.ni_vp) 1132 vrele(nd.ni_dvp); 1133 else 1134 vput(nd.ni_dvp); 1135 vrele(nd.ni_vp); 1136 error = EEXIST; 1137 goto out; 1138 } 1139 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1140 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1141 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1142 out: 1143 vrele(vp); 1144 return (error); 1145 } 1146 1147 /* 1148 * Make a symbolic link. 1149 */ 1150 /* ARGSUSED */ 1151 int 1152 sys_symlink(p, v, retval) 1153 struct proc *p; 1154 void *v; 1155 register_t *retval; 1156 { 1157 register struct sys_symlink_args /* { 1158 syscallarg(const char *) path; 1159 syscallarg(const char *) link; 1160 } */ *uap = v; 1161 struct vattr vattr; 1162 char *path; 1163 int error; 1164 struct nameidata nd; 1165 1166 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1167 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1168 if (error) 1169 goto out; 1170 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1171 if ((error = namei(&nd)) != 0) 1172 goto out; 1173 if (nd.ni_vp) { 1174 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1175 if (nd.ni_dvp == nd.ni_vp) 1176 vrele(nd.ni_dvp); 1177 else 1178 vput(nd.ni_dvp); 1179 vrele(nd.ni_vp); 1180 error = EEXIST; 1181 goto out; 1182 } 1183 VATTR_NULL(&vattr); 1184 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1185 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1186 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1187 out: 1188 FREE(path, M_NAMEI); 1189 return (error); 1190 } 1191 1192 /* 1193 * Delete a whiteout from the filesystem. 1194 */ 1195 /* ARGSUSED */ 1196 int 1197 sys_undelete(p, v, retval) 1198 struct proc *p; 1199 void *v; 1200 register_t *retval; 1201 { 1202 register struct sys_undelete_args /* { 1203 syscallarg(const char *) path; 1204 } */ *uap = v; 1205 int error; 1206 struct nameidata nd; 1207 1208 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1209 SCARG(uap, path), p); 1210 error = namei(&nd); 1211 if (error) 1212 return (error); 1213 1214 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1215 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1216 if (nd.ni_dvp == nd.ni_vp) 1217 vrele(nd.ni_dvp); 1218 else 1219 vput(nd.ni_dvp); 1220 if (nd.ni_vp) 1221 vrele(nd.ni_vp); 1222 return (EEXIST); 1223 } 1224 1225 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1226 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1227 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1228 vput(nd.ni_dvp); 1229 return (error); 1230 } 1231 1232 /* 1233 * Delete a name from the filesystem. 1234 */ 1235 /* ARGSUSED */ 1236 int 1237 sys_unlink(p, v, retval) 1238 struct proc *p; 1239 void *v; 1240 register_t *retval; 1241 { 1242 struct sys_unlink_args /* { 1243 syscallarg(const char *) path; 1244 } */ *uap = v; 1245 register struct vnode *vp; 1246 int error; 1247 struct nameidata nd; 1248 1249 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1250 SCARG(uap, path), p); 1251 if ((error = namei(&nd)) != 0) 1252 return (error); 1253 vp = nd.ni_vp; 1254 1255 /* 1256 * The root of a mounted filesystem cannot be deleted. 1257 */ 1258 if (vp->v_flag & VROOT) { 1259 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1260 if (nd.ni_dvp == vp) 1261 vrele(nd.ni_dvp); 1262 else 1263 vput(nd.ni_dvp); 1264 vput(vp); 1265 error = EBUSY; 1266 goto out; 1267 } 1268 1269 (void)uvm_vnp_uncache(vp); 1270 1271 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1272 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1273 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1274 out: 1275 return (error); 1276 } 1277 1278 /* 1279 * Reposition read/write file offset. 1280 */ 1281 int 1282 sys_lseek(p, v, retval) 1283 struct proc *p; 1284 void *v; 1285 register_t *retval; 1286 { 1287 register struct sys_lseek_args /* { 1288 syscallarg(int) fd; 1289 syscallarg(int) pad; 1290 syscallarg(off_t) offset; 1291 syscallarg(int) whence; 1292 } */ *uap = v; 1293 struct ucred *cred = p->p_ucred; 1294 register struct filedesc *fdp = p->p_fd; 1295 register struct file *fp; 1296 struct vnode *vp; 1297 struct vattr vattr; 1298 register off_t newoff; 1299 int error; 1300 1301 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1302 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1303 return (EBADF); 1304 1305 vp = (struct vnode *)fp->f_data; 1306 if (fp->f_type != DTYPE_VNODE 1307 || vp->v_type == VFIFO) 1308 return (ESPIPE); 1309 1310 switch (SCARG(uap, whence)) { 1311 case SEEK_CUR: 1312 newoff = fp->f_offset + SCARG(uap, offset); 1313 break; 1314 case SEEK_END: 1315 error = VOP_GETATTR(vp, &vattr, cred, p); 1316 if (error) 1317 return (error); 1318 newoff = SCARG(uap, offset) + vattr.va_size; 1319 break; 1320 case SEEK_SET: 1321 newoff = SCARG(uap, offset); 1322 break; 1323 default: 1324 return (EINVAL); 1325 } 1326 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1327 return (error); 1328 1329 *(off_t *)retval = fp->f_offset = newoff; 1330 return (0); 1331 } 1332 1333 /* 1334 * Positional read system call. 1335 */ 1336 int 1337 sys_pread(p, v, retval) 1338 struct proc *p; 1339 void *v; 1340 register_t *retval; 1341 { 1342 struct sys_pread_args /* { 1343 syscallarg(int) fd; 1344 syscallarg(void *) buf; 1345 syscallarg(size_t) nbyte; 1346 syscallarg(off_t) offset; 1347 } */ *uap = v; 1348 struct filedesc *fdp = p->p_fd; 1349 struct file *fp; 1350 struct vnode *vp; 1351 off_t offset; 1352 int error, fd = SCARG(uap, fd); 1353 1354 if ((u_int)fd >= fdp->fd_nfiles || 1355 (fp = fdp->fd_ofiles[fd]) == NULL || 1356 (fp->f_flag & FREAD) == 0) 1357 return (EBADF); 1358 1359 vp = (struct vnode *)fp->f_data; 1360 if (fp->f_type != DTYPE_VNODE 1361 || vp->v_type == VFIFO) 1362 return (ESPIPE); 1363 1364 offset = SCARG(uap, offset); 1365 1366 /* 1367 * XXX This works because no file systems actually 1368 * XXX take any action on the seek operation. 1369 */ 1370 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1371 return (error); 1372 1373 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1374 &offset, 0, retval)); 1375 } 1376 1377 /* 1378 * Positional scatter read system call. 1379 */ 1380 int 1381 sys_preadv(p, v, retval) 1382 struct proc *p; 1383 void *v; 1384 register_t *retval; 1385 { 1386 struct sys_preadv_args /* { 1387 syscallarg(int) fd; 1388 syscallarg(const struct iovec *) iovp; 1389 syscallarg(int) iovcnt; 1390 syscallarg(off_t) offset; 1391 } */ *uap = v; 1392 struct filedesc *fdp = p->p_fd; 1393 struct file *fp; 1394 struct vnode *vp; 1395 off_t offset; 1396 int error, fd = SCARG(uap, fd); 1397 1398 if ((u_int)fd >= fdp->fd_nfiles || 1399 (fp = fdp->fd_ofiles[fd]) == NULL || 1400 (fp->f_flag & FREAD) == 0) 1401 return (EBADF); 1402 1403 vp = (struct vnode *)fp->f_data; 1404 if (fp->f_type != DTYPE_VNODE 1405 || vp->v_type == VFIFO) 1406 return (ESPIPE); 1407 1408 offset = SCARG(uap, offset); 1409 1410 /* 1411 * XXX This works because no file systems actually 1412 * XXX take any action on the seek operation. 1413 */ 1414 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1415 return (error); 1416 1417 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1418 &offset, 0, retval)); 1419 } 1420 1421 /* 1422 * Positional write system call. 1423 */ 1424 int 1425 sys_pwrite(p, v, retval) 1426 struct proc *p; 1427 void *v; 1428 register_t *retval; 1429 { 1430 struct sys_pwrite_args /* { 1431 syscallarg(int) fd; 1432 syscallarg(const void *) buf; 1433 syscallarg(size_t) nbyte; 1434 syscallarg(off_t) offset; 1435 } */ *uap = v; 1436 struct filedesc *fdp = p->p_fd; 1437 struct file *fp; 1438 struct vnode *vp; 1439 off_t offset; 1440 int error, fd = SCARG(uap, fd); 1441 1442 if ((u_int)fd >= fdp->fd_nfiles || 1443 (fp = fdp->fd_ofiles[fd]) == NULL || 1444 (fp->f_flag & FWRITE) == 0) 1445 return (EBADF); 1446 1447 vp = (struct vnode *)fp->f_data; 1448 if (fp->f_type != DTYPE_VNODE 1449 || vp->v_type == VFIFO) 1450 return (ESPIPE); 1451 1452 offset = SCARG(uap, offset); 1453 1454 /* 1455 * XXX This works because no file systems actually 1456 * XXX take any action on the seek operation. 1457 */ 1458 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1459 return (error); 1460 1461 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1462 &offset, 0, retval)); 1463 } 1464 1465 /* 1466 * Positional gather write system call. 1467 */ 1468 int 1469 sys_pwritev(p, v, retval) 1470 struct proc *p; 1471 void *v; 1472 register_t *retval; 1473 { 1474 struct sys_pwritev_args /* { 1475 syscallarg(int) fd; 1476 syscallarg(const struct iovec *) iovp; 1477 syscallarg(int) iovcnt; 1478 syscallarg(off_t) offset; 1479 } */ *uap = v; 1480 struct filedesc *fdp = p->p_fd; 1481 struct file *fp; 1482 struct vnode *vp; 1483 off_t offset; 1484 int error, fd = SCARG(uap, fd); 1485 1486 if ((u_int)fd >= fdp->fd_nfiles || 1487 (fp = fdp->fd_ofiles[fd]) == NULL || 1488 (fp->f_flag & FWRITE) == 0) 1489 return (EBADF); 1490 1491 vp = (struct vnode *)fp->f_data; 1492 if (fp->f_type != DTYPE_VNODE 1493 || vp->v_type == VFIFO) 1494 return (ESPIPE); 1495 1496 offset = SCARG(uap, offset); 1497 1498 /* 1499 * XXX This works because no file systems actually 1500 * XXX take any action on the seek operation. 1501 */ 1502 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1503 return (error); 1504 1505 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1506 &offset, 0, retval)); 1507 } 1508 1509 /* 1510 * Check access permissions. 1511 */ 1512 int 1513 sys_access(p, v, retval) 1514 struct proc *p; 1515 void *v; 1516 register_t *retval; 1517 { 1518 register struct sys_access_args /* { 1519 syscallarg(const char *) path; 1520 syscallarg(int) flags; 1521 } */ *uap = v; 1522 register struct ucred *cred = p->p_ucred; 1523 register struct vnode *vp; 1524 int error, flags, t_gid, t_uid; 1525 struct nameidata nd; 1526 1527 t_uid = cred->cr_uid; 1528 t_gid = cred->cr_gid; 1529 cred->cr_uid = p->p_cred->p_ruid; 1530 cred->cr_gid = p->p_cred->p_rgid; 1531 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1532 SCARG(uap, path), p); 1533 if ((error = namei(&nd)) != 0) 1534 goto out1; 1535 vp = nd.ni_vp; 1536 1537 /* Flags == 0 means only check for existence. */ 1538 if (SCARG(uap, flags)) { 1539 flags = 0; 1540 if (SCARG(uap, flags) & R_OK) 1541 flags |= VREAD; 1542 if (SCARG(uap, flags) & W_OK) 1543 flags |= VWRITE; 1544 if (SCARG(uap, flags) & X_OK) 1545 flags |= VEXEC; 1546 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1547 error = VOP_ACCESS(vp, flags, cred, p); 1548 } 1549 vput(vp); 1550 out1: 1551 cred->cr_uid = t_uid; 1552 cred->cr_gid = t_gid; 1553 return (error); 1554 } 1555 1556 /* 1557 * Get file status; this version follows links. 1558 */ 1559 /* ARGSUSED */ 1560 int 1561 sys___stat13(p, v, retval) 1562 struct proc *p; 1563 void *v; 1564 register_t *retval; 1565 { 1566 register struct sys___stat13_args /* { 1567 syscallarg(const char *) path; 1568 syscallarg(struct stat *) ub; 1569 } */ *uap = v; 1570 struct stat sb; 1571 int error; 1572 struct nameidata nd; 1573 1574 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1575 SCARG(uap, path), p); 1576 if ((error = namei(&nd)) != 0) 1577 return (error); 1578 error = vn_stat(nd.ni_vp, &sb, p); 1579 vput(nd.ni_vp); 1580 if (error) 1581 return (error); 1582 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1583 return (error); 1584 } 1585 1586 /* 1587 * Get file status; this version does not follow links. 1588 */ 1589 /* ARGSUSED */ 1590 int 1591 sys___lstat13(p, v, retval) 1592 struct proc *p; 1593 void *v; 1594 register_t *retval; 1595 { 1596 register struct sys___lstat13_args /* { 1597 syscallarg(const char *) path; 1598 syscallarg(struct stat *) ub; 1599 } */ *uap = v; 1600 struct stat sb; 1601 int error; 1602 struct nameidata nd; 1603 1604 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1605 SCARG(uap, path), p); 1606 if ((error = namei(&nd)) != 0) 1607 return (error); 1608 error = vn_stat(nd.ni_vp, &sb, p); 1609 vput(nd.ni_vp); 1610 if (error) 1611 return (error); 1612 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1613 return (error); 1614 } 1615 1616 /* 1617 * Get configurable pathname variables. 1618 */ 1619 /* ARGSUSED */ 1620 int 1621 sys_pathconf(p, v, retval) 1622 struct proc *p; 1623 void *v; 1624 register_t *retval; 1625 { 1626 register struct sys_pathconf_args /* { 1627 syscallarg(const char *) path; 1628 syscallarg(int) name; 1629 } */ *uap = v; 1630 int error; 1631 struct nameidata nd; 1632 1633 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1634 SCARG(uap, path), p); 1635 if ((error = namei(&nd)) != 0) 1636 return (error); 1637 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1638 vput(nd.ni_vp); 1639 return (error); 1640 } 1641 1642 /* 1643 * Return target name of a symbolic link. 1644 */ 1645 /* ARGSUSED */ 1646 int 1647 sys_readlink(p, v, retval) 1648 struct proc *p; 1649 void *v; 1650 register_t *retval; 1651 { 1652 register struct sys_readlink_args /* { 1653 syscallarg(const char *) path; 1654 syscallarg(char *) buf; 1655 syscallarg(size_t) count; 1656 } */ *uap = v; 1657 register struct vnode *vp; 1658 struct iovec aiov; 1659 struct uio auio; 1660 int error; 1661 struct nameidata nd; 1662 1663 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1664 SCARG(uap, path), p); 1665 if ((error = namei(&nd)) != 0) 1666 return (error); 1667 vp = nd.ni_vp; 1668 if (vp->v_type != VLNK) 1669 error = EINVAL; 1670 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1671 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1672 aiov.iov_base = SCARG(uap, buf); 1673 aiov.iov_len = SCARG(uap, count); 1674 auio.uio_iov = &aiov; 1675 auio.uio_iovcnt = 1; 1676 auio.uio_offset = 0; 1677 auio.uio_rw = UIO_READ; 1678 auio.uio_segflg = UIO_USERSPACE; 1679 auio.uio_procp = p; 1680 auio.uio_resid = SCARG(uap, count); 1681 error = VOP_READLINK(vp, &auio, p->p_ucred); 1682 } 1683 vput(vp); 1684 *retval = SCARG(uap, count) - auio.uio_resid; 1685 return (error); 1686 } 1687 1688 /* 1689 * Change flags of a file given a path name. 1690 */ 1691 /* ARGSUSED */ 1692 int 1693 sys_chflags(p, v, retval) 1694 struct proc *p; 1695 void *v; 1696 register_t *retval; 1697 { 1698 register struct sys_chflags_args /* { 1699 syscallarg(const char *) path; 1700 syscallarg(u_long) flags; 1701 } */ *uap = v; 1702 register struct vnode *vp; 1703 struct vattr vattr; 1704 int error; 1705 struct nameidata nd; 1706 1707 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1708 if ((error = namei(&nd)) != 0) 1709 return (error); 1710 vp = nd.ni_vp; 1711 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1712 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1713 VATTR_NULL(&vattr); 1714 vattr.va_flags = SCARG(uap, flags); 1715 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1716 vput(vp); 1717 return (error); 1718 } 1719 1720 /* 1721 * Change flags of a file given a file descriptor. 1722 */ 1723 /* ARGSUSED */ 1724 int 1725 sys_fchflags(p, v, retval) 1726 struct proc *p; 1727 void *v; 1728 register_t *retval; 1729 { 1730 register struct sys_fchflags_args /* { 1731 syscallarg(int) fd; 1732 syscallarg(u_long) flags; 1733 } */ *uap = v; 1734 struct vattr vattr; 1735 struct vnode *vp; 1736 struct file *fp; 1737 int error; 1738 1739 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1740 return (error); 1741 vp = (struct vnode *)fp->f_data; 1742 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1743 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1744 VATTR_NULL(&vattr); 1745 vattr.va_flags = SCARG(uap, flags); 1746 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1747 VOP_UNLOCK(vp, 0); 1748 return (error); 1749 } 1750 1751 /* 1752 * Change mode of a file given path name; this version follows links. 1753 */ 1754 /* ARGSUSED */ 1755 int 1756 sys_chmod(p, v, retval) 1757 struct proc *p; 1758 void *v; 1759 register_t *retval; 1760 { 1761 register struct sys_chmod_args /* { 1762 syscallarg(const char *) path; 1763 syscallarg(int) mode; 1764 } */ *uap = v; 1765 int error; 1766 struct nameidata nd; 1767 1768 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1769 if ((error = namei(&nd)) != 0) 1770 return (error); 1771 1772 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1773 1774 vrele(nd.ni_vp); 1775 return (error); 1776 } 1777 1778 /* 1779 * Change mode of a file given a file descriptor. 1780 */ 1781 /* ARGSUSED */ 1782 int 1783 sys_fchmod(p, v, retval) 1784 struct proc *p; 1785 void *v; 1786 register_t *retval; 1787 { 1788 register struct sys_fchmod_args /* { 1789 syscallarg(int) fd; 1790 syscallarg(int) mode; 1791 } */ *uap = v; 1792 struct file *fp; 1793 int error; 1794 1795 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1796 return (error); 1797 1798 return (change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p)); 1799 } 1800 1801 /* 1802 * Change mode of a file given path name; this version does not follow links. 1803 */ 1804 /* ARGSUSED */ 1805 int 1806 sys_lchmod(p, v, retval) 1807 struct proc *p; 1808 void *v; 1809 register_t *retval; 1810 { 1811 register struct sys_lchmod_args /* { 1812 syscallarg(const char *) path; 1813 syscallarg(int) mode; 1814 } */ *uap = v; 1815 int error; 1816 struct nameidata nd; 1817 1818 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1819 if ((error = namei(&nd)) != 0) 1820 return (error); 1821 1822 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1823 1824 vrele(nd.ni_vp); 1825 return (error); 1826 } 1827 1828 /* 1829 * Common routine to set mode given a vnode. 1830 */ 1831 static int 1832 change_mode(vp, mode, p) 1833 struct vnode *vp; 1834 int mode; 1835 struct proc *p; 1836 { 1837 struct vattr vattr; 1838 int error; 1839 1840 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1841 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1842 VATTR_NULL(&vattr); 1843 vattr.va_mode = mode & ALLPERMS; 1844 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1845 VOP_UNLOCK(vp, 0); 1846 return (error); 1847 } 1848 1849 /* 1850 * Set ownership given a path name; this version follows links. 1851 */ 1852 /* ARGSUSED */ 1853 int 1854 sys_chown(p, v, retval) 1855 struct proc *p; 1856 void *v; 1857 register_t *retval; 1858 { 1859 register struct sys_chown_args /* { 1860 syscallarg(const char *) path; 1861 syscallarg(uid_t) uid; 1862 syscallarg(gid_t) gid; 1863 } */ *uap = v; 1864 int error; 1865 struct nameidata nd; 1866 1867 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1868 if ((error = namei(&nd)) != 0) 1869 return (error); 1870 1871 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1872 1873 vrele(nd.ni_vp); 1874 return (error); 1875 } 1876 1877 /* 1878 * Set ownership given a path name; this version follows links. 1879 * Provides POSIX semantics. 1880 */ 1881 /* ARGSUSED */ 1882 int 1883 sys___posix_chown(p, v, retval) 1884 struct proc *p; 1885 void *v; 1886 register_t *retval; 1887 { 1888 register struct sys_chown_args /* { 1889 syscallarg(const char *) path; 1890 syscallarg(uid_t) uid; 1891 syscallarg(gid_t) gid; 1892 } */ *uap = v; 1893 int error; 1894 struct nameidata nd; 1895 1896 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1897 if ((error = namei(&nd)) != 0) 1898 return (error); 1899 1900 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 1901 1902 vrele(nd.ni_vp); 1903 return (error); 1904 } 1905 1906 /* 1907 * Set ownership given a file descriptor. 1908 */ 1909 /* ARGSUSED */ 1910 int 1911 sys_fchown(p, v, retval) 1912 struct proc *p; 1913 void *v; 1914 register_t *retval; 1915 { 1916 register struct sys_fchown_args /* { 1917 syscallarg(int) fd; 1918 syscallarg(uid_t) uid; 1919 syscallarg(gid_t) gid; 1920 } */ *uap = v; 1921 int error; 1922 struct file *fp; 1923 1924 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1925 return (error); 1926 1927 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1928 SCARG(uap, gid), p, 0)); 1929 } 1930 1931 /* 1932 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 1933 */ 1934 /* ARGSUSED */ 1935 int 1936 sys___posix_fchown(p, v, retval) 1937 struct proc *p; 1938 void *v; 1939 register_t *retval; 1940 { 1941 register struct sys_fchown_args /* { 1942 syscallarg(int) fd; 1943 syscallarg(uid_t) uid; 1944 syscallarg(gid_t) gid; 1945 } */ *uap = v; 1946 int error; 1947 struct file *fp; 1948 1949 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1950 return (error); 1951 1952 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1953 SCARG(uap, gid), p, 1)); 1954 } 1955 1956 /* 1957 * Set ownership given a path name; this version does not follow links. 1958 */ 1959 /* ARGSUSED */ 1960 int 1961 sys_lchown(p, v, retval) 1962 struct proc *p; 1963 void *v; 1964 register_t *retval; 1965 { 1966 register struct sys_lchown_args /* { 1967 syscallarg(const char *) path; 1968 syscallarg(uid_t) uid; 1969 syscallarg(gid_t) gid; 1970 } */ *uap = v; 1971 int error; 1972 struct nameidata nd; 1973 1974 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1975 if ((error = namei(&nd)) != 0) 1976 return (error); 1977 1978 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1979 1980 vrele(nd.ni_vp); 1981 return (error); 1982 } 1983 1984 /* 1985 * Set ownership given a path name; this version does not follow links. 1986 * Provides POSIX/XPG semantics. 1987 */ 1988 /* ARGSUSED */ 1989 int 1990 sys___posix_lchown(p, v, retval) 1991 struct proc *p; 1992 void *v; 1993 register_t *retval; 1994 { 1995 register struct sys_lchown_args /* { 1996 syscallarg(const char *) path; 1997 syscallarg(uid_t) uid; 1998 syscallarg(gid_t) gid; 1999 } */ *uap = v; 2000 int error; 2001 struct nameidata nd; 2002 2003 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2004 if ((error = namei(&nd)) != 0) 2005 return (error); 2006 2007 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2008 2009 vrele(nd.ni_vp); 2010 return (error); 2011 } 2012 2013 /* 2014 * Common routine to set ownership given a vnode. 2015 */ 2016 static int 2017 change_owner(vp, uid, gid, p, posix_semantics) 2018 register struct vnode *vp; 2019 uid_t uid; 2020 gid_t gid; 2021 struct proc *p; 2022 int posix_semantics; 2023 { 2024 struct vattr vattr; 2025 mode_t newmode; 2026 int error; 2027 2028 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2029 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2030 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2031 goto out; 2032 2033 #define CHANGED(x) ((x) != -1) 2034 newmode = vattr.va_mode; 2035 if (posix_semantics) { 2036 /* 2037 * POSIX/XPG semantics: if the caller is not the super-user, 2038 * clear set-user-id and set-group-id bits. Both POSIX and 2039 * the XPG consider the behaviour for calls by the super-user 2040 * implementation-defined; we leave the set-user-id and set- 2041 * group-id settings intact in that case. 2042 */ 2043 if (suser(p->p_ucred, NULL) != 0) 2044 newmode &= ~(S_ISUID | S_ISGID); 2045 } else { 2046 /* 2047 * NetBSD semantics: when changing owner and/or group, 2048 * clear the respective bit(s). 2049 */ 2050 if (CHANGED(uid)) 2051 newmode &= ~S_ISUID; 2052 if (CHANGED(gid)) 2053 newmode &= ~S_ISGID; 2054 } 2055 /* Update va_mode iff altered. */ 2056 if (vattr.va_mode == newmode) 2057 newmode = VNOVAL; 2058 2059 VATTR_NULL(&vattr); 2060 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2061 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2062 vattr.va_mode = newmode; 2063 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2064 #undef CHANGED 2065 2066 out: 2067 VOP_UNLOCK(vp, 0); 2068 return (error); 2069 } 2070 2071 /* 2072 * Set the access and modification times given a path name; this 2073 * version follows links. 2074 */ 2075 /* ARGSUSED */ 2076 int 2077 sys_utimes(p, v, retval) 2078 struct proc *p; 2079 void *v; 2080 register_t *retval; 2081 { 2082 register struct sys_utimes_args /* { 2083 syscallarg(const char *) path; 2084 syscallarg(const struct timeval *) tptr; 2085 } */ *uap = v; 2086 int error; 2087 struct nameidata nd; 2088 2089 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2090 if ((error = namei(&nd)) != 0) 2091 return (error); 2092 2093 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2094 2095 vrele(nd.ni_vp); 2096 return (error); 2097 } 2098 2099 /* 2100 * Set the access and modification times given a file descriptor. 2101 */ 2102 /* ARGSUSED */ 2103 int 2104 sys_futimes(p, v, retval) 2105 struct proc *p; 2106 void *v; 2107 register_t *retval; 2108 { 2109 register struct sys_futimes_args /* { 2110 syscallarg(int) fd; 2111 syscallarg(const struct timeval *) tptr; 2112 } */ *uap = v; 2113 int error; 2114 struct file *fp; 2115 2116 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2117 return (error); 2118 2119 return (change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), 2120 p)); 2121 } 2122 2123 /* 2124 * Set the access and modification times given a path name; this 2125 * version does not follow links. 2126 */ 2127 /* ARGSUSED */ 2128 int 2129 sys_lutimes(p, v, retval) 2130 struct proc *p; 2131 void *v; 2132 register_t *retval; 2133 { 2134 register struct sys_lutimes_args /* { 2135 syscallarg(const char *) path; 2136 syscallarg(const struct timeval *) tptr; 2137 } */ *uap = v; 2138 int error; 2139 struct nameidata nd; 2140 2141 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2142 if ((error = namei(&nd)) != 0) 2143 return (error); 2144 2145 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2146 2147 vrele(nd.ni_vp); 2148 return (error); 2149 } 2150 2151 /* 2152 * Common routine to set access and modification times given a vnode. 2153 */ 2154 static int 2155 change_utimes(vp, tptr, p) 2156 struct vnode *vp; 2157 const struct timeval *tptr; 2158 struct proc *p; 2159 { 2160 struct timeval tv[2]; 2161 struct vattr vattr; 2162 int error; 2163 2164 VATTR_NULL(&vattr); 2165 if (tptr == NULL) { 2166 microtime(&tv[0]); 2167 tv[1] = tv[0]; 2168 vattr.va_vaflags |= VA_UTIMES_NULL; 2169 } else { 2170 error = copyin(tptr, tv, sizeof(tv)); 2171 if (error) 2172 return (error); 2173 } 2174 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2175 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2176 vattr.va_atime.tv_sec = tv[0].tv_sec; 2177 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2178 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2179 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2180 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2181 VOP_UNLOCK(vp, 0); 2182 return (error); 2183 } 2184 2185 /* 2186 * Truncate a file given its path name. 2187 */ 2188 /* ARGSUSED */ 2189 int 2190 sys_truncate(p, v, retval) 2191 struct proc *p; 2192 void *v; 2193 register_t *retval; 2194 { 2195 register struct sys_truncate_args /* { 2196 syscallarg(const char *) path; 2197 syscallarg(int) pad; 2198 syscallarg(off_t) length; 2199 } */ *uap = v; 2200 register struct vnode *vp; 2201 struct vattr vattr; 2202 int error; 2203 struct nameidata nd; 2204 2205 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2206 if ((error = namei(&nd)) != 0) 2207 return (error); 2208 vp = nd.ni_vp; 2209 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2210 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2211 if (vp->v_type == VDIR) 2212 error = EISDIR; 2213 else if ((error = vn_writechk(vp)) == 0 && 2214 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2215 VATTR_NULL(&vattr); 2216 vattr.va_size = SCARG(uap, length); 2217 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2218 } 2219 vput(vp); 2220 return (error); 2221 } 2222 2223 /* 2224 * Truncate a file given a file descriptor. 2225 */ 2226 /* ARGSUSED */ 2227 int 2228 sys_ftruncate(p, v, retval) 2229 struct proc *p; 2230 void *v; 2231 register_t *retval; 2232 { 2233 register struct sys_ftruncate_args /* { 2234 syscallarg(int) fd; 2235 syscallarg(int) pad; 2236 syscallarg(off_t) length; 2237 } */ *uap = v; 2238 struct vattr vattr; 2239 struct vnode *vp; 2240 struct file *fp; 2241 int error; 2242 2243 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2244 return (error); 2245 if ((fp->f_flag & FWRITE) == 0) 2246 return (EINVAL); 2247 vp = (struct vnode *)fp->f_data; 2248 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2249 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2250 if (vp->v_type == VDIR) 2251 error = EISDIR; 2252 else if ((error = vn_writechk(vp)) == 0) { 2253 VATTR_NULL(&vattr); 2254 vattr.va_size = SCARG(uap, length); 2255 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2256 } 2257 VOP_UNLOCK(vp, 0); 2258 return (error); 2259 } 2260 2261 /* 2262 * Sync an open file. 2263 */ 2264 /* ARGSUSED */ 2265 int 2266 sys_fsync(p, v, retval) 2267 struct proc *p; 2268 void *v; 2269 register_t *retval; 2270 { 2271 struct sys_fsync_args /* { 2272 syscallarg(int) fd; 2273 } */ *uap = v; 2274 register struct vnode *vp; 2275 struct file *fp; 2276 int error; 2277 2278 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2279 return (error); 2280 vp = (struct vnode *)fp->f_data; 2281 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2282 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2283 VOP_UNLOCK(vp, 0); 2284 return (error); 2285 } 2286 2287 /* 2288 * Sync the data of an open file. 2289 */ 2290 /* ARGSUSED */ 2291 int 2292 sys_fdatasync(p, v, retval) 2293 struct proc *p; 2294 void *v; 2295 register_t *retval; 2296 { 2297 struct sys_fdatasync_args /* { 2298 syscallarg(int) fd; 2299 } */ *uap = v; 2300 struct vnode *vp; 2301 struct file *fp; 2302 int error; 2303 2304 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2305 return (error); 2306 vp = (struct vnode *)fp->f_data; 2307 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2308 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2309 VOP_UNLOCK(vp, 0); 2310 return (error); 2311 } 2312 2313 /* 2314 * Rename files, (standard) BSD semantics frontend. 2315 */ 2316 /* ARGSUSED */ 2317 int 2318 sys_rename(p, v, retval) 2319 struct proc *p; 2320 void *v; 2321 register_t *retval; 2322 { 2323 register struct sys_rename_args /* { 2324 syscallarg(const char *) from; 2325 syscallarg(const char *) to; 2326 } */ *uap = v; 2327 2328 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2329 } 2330 2331 /* 2332 * Rename files, POSIX semantics frontend. 2333 */ 2334 /* ARGSUSED */ 2335 int 2336 sys___posix_rename(p, v, retval) 2337 struct proc *p; 2338 void *v; 2339 register_t *retval; 2340 { 2341 register struct sys___posix_rename_args /* { 2342 syscallarg(const char *) from; 2343 syscallarg(const char *) to; 2344 } */ *uap = v; 2345 2346 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2347 } 2348 2349 /* 2350 * Rename files. Source and destination must either both be directories, 2351 * or both not be directories. If target is a directory, it must be empty. 2352 * If `from' and `to' refer to the same object, the value of the `retain' 2353 * argument is used to determine whether `from' will be 2354 * 2355 * (retain == 0) deleted unless `from' and `to' refer to the same 2356 * object in the file system's name space (BSD). 2357 * (retain == 1) always retained (POSIX). 2358 */ 2359 static int 2360 rename_files(from, to, p, retain) 2361 const char *from, *to; 2362 struct proc *p; 2363 int retain; 2364 { 2365 register struct vnode *tvp, *fvp, *tdvp; 2366 struct nameidata fromnd, tond; 2367 int error; 2368 2369 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2370 from, p); 2371 if ((error = namei(&fromnd)) != 0) 2372 return (error); 2373 fvp = fromnd.ni_vp; 2374 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2375 UIO_USERSPACE, to, p); 2376 if ((error = namei(&tond)) != 0) { 2377 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2378 vrele(fromnd.ni_dvp); 2379 vrele(fvp); 2380 goto out1; 2381 } 2382 tdvp = tond.ni_dvp; 2383 tvp = tond.ni_vp; 2384 2385 if (tvp != NULL) { 2386 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2387 error = ENOTDIR; 2388 goto out; 2389 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2390 error = EISDIR; 2391 goto out; 2392 } 2393 } 2394 2395 if (fvp == tdvp) 2396 error = EINVAL; 2397 2398 /* 2399 * Source and destination refer to the same object. 2400 */ 2401 if (fvp == tvp) { 2402 if (retain) 2403 error = -1; 2404 else if (fromnd.ni_dvp == tdvp && 2405 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2406 !memcmp(fromnd.ni_cnd.cn_nameptr, 2407 tond.ni_cnd.cn_nameptr, 2408 fromnd.ni_cnd.cn_namelen)) 2409 error = -1; 2410 } 2411 2412 out: 2413 if (!error) { 2414 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2415 if (fromnd.ni_dvp != tdvp) 2416 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2417 if (tvp) { 2418 (void)uvm_vnp_uncache(tvp); 2419 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2420 } 2421 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2422 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2423 } else { 2424 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2425 if (tdvp == tvp) 2426 vrele(tdvp); 2427 else 2428 vput(tdvp); 2429 if (tvp) 2430 vput(tvp); 2431 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2432 vrele(fromnd.ni_dvp); 2433 vrele(fvp); 2434 } 2435 vrele(tond.ni_startdir); 2436 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2437 out1: 2438 if (fromnd.ni_startdir) 2439 vrele(fromnd.ni_startdir); 2440 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2441 return (error == -1 ? 0 : error); 2442 } 2443 2444 /* 2445 * Make a directory file. 2446 */ 2447 /* ARGSUSED */ 2448 int 2449 sys_mkdir(p, v, retval) 2450 struct proc *p; 2451 void *v; 2452 register_t *retval; 2453 { 2454 register struct sys_mkdir_args /* { 2455 syscallarg(const char *) path; 2456 syscallarg(int) mode; 2457 } */ *uap = v; 2458 register struct vnode *vp; 2459 struct vattr vattr; 2460 int error; 2461 struct nameidata nd; 2462 2463 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2464 if ((error = namei(&nd)) != 0) 2465 return (error); 2466 vp = nd.ni_vp; 2467 if (vp != NULL) { 2468 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2469 if (nd.ni_dvp == vp) 2470 vrele(nd.ni_dvp); 2471 else 2472 vput(nd.ni_dvp); 2473 vrele(vp); 2474 return (EEXIST); 2475 } 2476 VATTR_NULL(&vattr); 2477 vattr.va_type = VDIR; 2478 vattr.va_mode = 2479 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2480 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2481 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2482 if (!error) 2483 vput(nd.ni_vp); 2484 return (error); 2485 } 2486 2487 /* 2488 * Remove a directory file. 2489 */ 2490 /* ARGSUSED */ 2491 int 2492 sys_rmdir(p, v, retval) 2493 struct proc *p; 2494 void *v; 2495 register_t *retval; 2496 { 2497 struct sys_rmdir_args /* { 2498 syscallarg(const char *) path; 2499 } */ *uap = v; 2500 register struct vnode *vp; 2501 int error; 2502 struct nameidata nd; 2503 2504 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2505 SCARG(uap, path), p); 2506 if ((error = namei(&nd)) != 0) 2507 return (error); 2508 vp = nd.ni_vp; 2509 if (vp->v_type != VDIR) { 2510 error = ENOTDIR; 2511 goto out; 2512 } 2513 /* 2514 * No rmdir "." please. 2515 */ 2516 if (nd.ni_dvp == vp) { 2517 error = EINVAL; 2518 goto out; 2519 } 2520 /* 2521 * The root of a mounted filesystem cannot be deleted. 2522 */ 2523 if (vp->v_flag & VROOT) 2524 error = EBUSY; 2525 out: 2526 if (!error) { 2527 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2528 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2529 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2530 } else { 2531 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2532 if (nd.ni_dvp == vp) 2533 vrele(nd.ni_dvp); 2534 else 2535 vput(nd.ni_dvp); 2536 vput(vp); 2537 } 2538 return (error); 2539 } 2540 2541 /* 2542 * Read a block of directory entries in a file system independent format. 2543 */ 2544 int 2545 sys_getdents(p, v, retval) 2546 struct proc *p; 2547 void *v; 2548 register_t *retval; 2549 { 2550 register struct sys_getdents_args /* { 2551 syscallarg(int) fd; 2552 syscallarg(char *) buf; 2553 syscallarg(size_t) count; 2554 } */ *uap = v; 2555 struct file *fp; 2556 int error, done; 2557 2558 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2559 return (error); 2560 if ((fp->f_flag & FREAD) == 0) 2561 return (EBADF); 2562 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2563 SCARG(uap, count), &done, p, 0, 0); 2564 *retval = done; 2565 return (error); 2566 } 2567 2568 /* 2569 * Set the mode mask for creation of filesystem nodes. 2570 */ 2571 int 2572 sys_umask(p, v, retval) 2573 struct proc *p; 2574 void *v; 2575 register_t *retval; 2576 { 2577 struct sys_umask_args /* { 2578 syscallarg(mode_t) newmask; 2579 } */ *uap = v; 2580 struct cwdinfo *cwdi; 2581 2582 cwdi = p->p_cwdi; 2583 *retval = cwdi->cwdi_cmask; 2584 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2585 return (0); 2586 } 2587 2588 /* 2589 * Void all references to file by ripping underlying filesystem 2590 * away from vnode. 2591 */ 2592 /* ARGSUSED */ 2593 int 2594 sys_revoke(p, v, retval) 2595 struct proc *p; 2596 void *v; 2597 register_t *retval; 2598 { 2599 register struct sys_revoke_args /* { 2600 syscallarg(const char *) path; 2601 } */ *uap = v; 2602 register struct vnode *vp; 2603 struct vattr vattr; 2604 int error; 2605 struct nameidata nd; 2606 2607 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2608 if ((error = namei(&nd)) != 0) 2609 return (error); 2610 vp = nd.ni_vp; 2611 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2612 goto out; 2613 if (p->p_ucred->cr_uid != vattr.va_uid && 2614 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2615 goto out; 2616 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2617 VOP_REVOKE(vp, REVOKEALL); 2618 out: 2619 vrele(vp); 2620 return (error); 2621 } 2622 2623 /* 2624 * Convert a user file descriptor to a kernel file entry. 2625 */ 2626 int 2627 getvnode(fdp, fd, fpp) 2628 struct filedesc *fdp; 2629 int fd; 2630 struct file **fpp; 2631 { 2632 struct vnode *vp; 2633 struct file *fp; 2634 2635 if ((u_int)fd >= fdp->fd_nfiles || 2636 (fp = fdp->fd_ofiles[fd]) == NULL) 2637 return (EBADF); 2638 if (fp->f_type != DTYPE_VNODE) 2639 return (EINVAL); 2640 vp = (struct vnode *)fp->f_data; 2641 if (vp->v_type == VBAD) 2642 return (EBADF); 2643 *fpp = fp; 2644 return (0); 2645 } 2646
Indexes created Wed Sep 24 14:09:57 GMT 2025