vfs_syscalls.c revision 1.124
1 /* $NetBSD: vfs_syscalls.c,v 1.124 1998/11/13 04:12:35 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_uvm.h" 44 #include "opt_compat_netbsd.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 #if defined(UVM) 66 #include <uvm/uvm_extern.h> 67 #endif 68 69 static int change_dir __P((struct nameidata *, struct proc *)); 70 static int change_mode __P((struct vnode *, int, struct proc *p)); 71 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 72 int)); 73 static int change_utimes __P((struct vnode *vp, const struct timeval *, 74 struct proc *p)); 75 static int rename_files __P((const char *, const char *, struct proc *, int)); 76 77 void checkdirs __P((struct vnode *)); 78 int dounmount __P((struct mount *, int, struct proc *)); 79 80 /* 81 * Virtual File System System Calls 82 */ 83 84 /* 85 * Mount a file system. 86 */ 87 88 /* 89 * This table is used to maintain compatibility with 4.3BSD 90 * and NetBSD 0.9 mount syscalls. Note, the order is important! 91 * 92 * Also note that not all of these had actual numbers in 4.3BSD 93 * or NetBSD 0.9! 94 */ 95 const char *mountcompatnames[] = { 96 NULL, /* 0 = MOUNT_NONE */ 97 MOUNT_FFS, /* 1 */ 98 MOUNT_NFS, /* 2 */ 99 MOUNT_MFS, /* 3 */ 100 MOUNT_MSDOS, /* 4 */ 101 MOUNT_LFS, /* 5 */ 102 NULL, /* 6 = MOUNT_LOFS */ 103 MOUNT_FDESC, /* 7 */ 104 MOUNT_PORTAL, /* 8 */ 105 MOUNT_NULL, /* 9 */ 106 MOUNT_UMAP, /* 10 */ 107 MOUNT_KERNFS, /* 11 */ 108 MOUNT_PROCFS, /* 12 */ 109 MOUNT_AFS, /* 13 */ 110 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 111 MOUNT_UNION, /* 15 */ 112 MOUNT_ADOSFS, /* 16 */ 113 MOUNT_EXT2FS, /* 17 */ 114 MOUNT_CODA, /* 18 */ 115 MOUNT_FILECORE, /* 19 */ 116 }; 117 const int nmountcompatnames = sizeof(mountcompatnames) / 118 sizeof(mountcompatnames[0]); 119 120 /* ARGSUSED */ 121 int 122 sys_mount(p, v, retval) 123 struct proc *p; 124 void *v; 125 register_t *retval; 126 { 127 register struct sys_mount_args /* { 128 syscallarg(const char *) type; 129 syscallarg(const char *) path; 130 syscallarg(int) flags; 131 syscallarg(void *) data; 132 } */ *uap = v; 133 struct vnode *vp; 134 struct mount *mp; 135 int error, flag = 0; 136 char fstypename[MFSNAMELEN]; 137 struct vattr va; 138 struct nameidata nd; 139 struct vfsops *vfs; 140 141 /* 142 * Get vnode to be covered 143 */ 144 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 145 SCARG(uap, path), p); 146 if ((error = namei(&nd)) != 0) 147 return (error); 148 vp = nd.ni_vp; 149 /* 150 * A lookup in VFS_MOUNT might result in an attempt to 151 * lock this vnode again, so make the lock resursive. 152 */ 153 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_CANRECURSE); 154 if (SCARG(uap, flags) & MNT_UPDATE) { 155 if ((vp->v_flag & VROOT) == 0) { 156 vput(vp); 157 return (EINVAL); 158 } 159 mp = vp->v_mount; 160 flag = mp->mnt_flag; 161 vfs = mp->mnt_op; 162 /* 163 * We only allow the filesystem to be reloaded if it 164 * is currently mounted read-only. 165 */ 166 if ((SCARG(uap, flags) & MNT_RELOAD) && 167 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 168 vput(vp); 169 return (EOPNOTSUPP); /* Needs translation */ 170 } 171 mp->mnt_flag |= 172 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 173 /* 174 * Only root, or the user that did the original mount is 175 * permitted to update it. 176 */ 177 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 178 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 179 vput(vp); 180 return (error); 181 } 182 /* 183 * Do not allow NFS export by non-root users. Silently 184 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 185 */ 186 if (p->p_ucred->cr_uid != 0) { 187 if (SCARG(uap, flags) & MNT_EXPORTED) { 188 vput(vp); 189 return (EPERM); 190 } 191 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 192 } 193 if (vfs_busy(mp, LK_NOWAIT, 0)) { 194 vput(vp); 195 return (EPERM); 196 } 197 VOP_UNLOCK(vp, 0); 198 goto update; 199 } 200 /* 201 * If the user is not root, ensure that they own the directory 202 * onto which we are attempting to mount. 203 */ 204 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 205 (va.va_uid != p->p_ucred->cr_uid && 206 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 207 vput(vp); 208 return (error); 209 } 210 /* 211 * Do not allow NFS export by non-root users. Silently 212 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 213 */ 214 if (p->p_ucred->cr_uid != 0) { 215 if (SCARG(uap, flags) & MNT_EXPORTED) { 216 vput(vp); 217 return (EPERM); 218 } 219 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 220 } 221 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 222 return (error); 223 if (vp->v_type != VDIR) { 224 vput(vp); 225 return (ENOTDIR); 226 } 227 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 228 if (error) { 229 #if defined(COMPAT_09) || defined(COMPAT_43) 230 /* 231 * Historically filesystem types were identified by number. 232 * If we get an integer for the filesystem type instead of a 233 * string, we check to see if it matches one of the historic 234 * filesystem types. 235 */ 236 u_long fsindex = (u_long)SCARG(uap, type); 237 if (fsindex >= nmountcompatnames || 238 mountcompatnames[fsindex] == NULL) { 239 vput(vp); 240 return (ENODEV); 241 } 242 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 243 #else 244 vput(vp); 245 return (error); 246 #endif 247 } 248 #ifdef COMPAT_10 249 /* Accept `ufs' as an alias for `ffs'. */ 250 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 251 strncpy(fstypename, "ffs", MFSNAMELEN); 252 #endif 253 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 254 vput(vp); 255 return (ENODEV); 256 } 257 if (vp->v_mountedhere != NULL) { 258 vput(vp); 259 return (EBUSY); 260 } 261 262 /* 263 * Allocate and initialize the file system. 264 */ 265 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 266 M_MOUNT, M_WAITOK); 267 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 268 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 269 (void)vfs_busy(mp, LK_NOWAIT, 0); 270 mp->mnt_op = vfs; 271 vfs->vfs_refcount++; 272 vp->v_mountedhere = mp; 273 mp->mnt_vnodecovered = vp; 274 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 275 update: 276 /* 277 * Set the mount level flags. 278 */ 279 if (SCARG(uap, flags) & MNT_RDONLY) 280 mp->mnt_flag |= MNT_RDONLY; 281 else if (mp->mnt_flag & MNT_RDONLY) 282 mp->mnt_flag |= MNT_WANTRDWR; 283 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 284 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 285 MNT_NOATIME | MNT_SYMPERM); 286 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 287 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 288 MNT_NOCOREDUMP | MNT_NOATIME | MNT_SYMPERM); 289 /* 290 * Mount the filesystem. 291 */ 292 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 293 if (mp->mnt_flag & MNT_UPDATE) { 294 vrele(vp); 295 if (mp->mnt_flag & MNT_WANTRDWR) 296 mp->mnt_flag &= ~MNT_RDONLY; 297 mp->mnt_flag &=~ 298 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 299 if (error) 300 mp->mnt_flag = flag; 301 vfs_unbusy(mp); 302 return (error); 303 } 304 /* 305 * Put the new filesystem on the mount list after root. 306 */ 307 cache_purge(vp); 308 if (!error) { 309 simple_lock(&mountlist_slock); 310 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 311 simple_unlock(&mountlist_slock); 312 checkdirs(vp); 313 VOP_UNLOCK(vp, 0); 314 vfs_unbusy(mp); 315 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 316 if ((error = VFS_START(mp, 0, p))) 317 vrele(vp); 318 } else { 319 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 320 vfs->vfs_refcount--; 321 vfs_unbusy(mp); 322 free((caddr_t)mp, M_MOUNT); 323 vput(vp); 324 } 325 return (error); 326 } 327 328 /* 329 * Scan all active processes to see if any of them have a current 330 * or root directory onto which the new filesystem has just been 331 * mounted. If so, replace them with the new mount point. 332 */ 333 void 334 checkdirs(olddp) 335 struct vnode *olddp; 336 { 337 struct filedesc *fdp; 338 struct vnode *newdp; 339 struct proc *p; 340 341 if (olddp->v_usecount == 1) 342 return; 343 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 344 panic("mount: lost mount"); 345 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 346 fdp = p->p_fd; 347 if (fdp->fd_cdir == olddp) { 348 vrele(fdp->fd_cdir); 349 VREF(newdp); 350 fdp->fd_cdir = newdp; 351 } 352 if (fdp->fd_rdir == olddp) { 353 vrele(fdp->fd_rdir); 354 VREF(newdp); 355 fdp->fd_rdir = newdp; 356 } 357 } 358 if (rootvnode == olddp) { 359 vrele(rootvnode); 360 VREF(newdp); 361 rootvnode = newdp; 362 } 363 vput(newdp); 364 } 365 366 /* 367 * Unmount a file system. 368 * 369 * Note: unmount takes a path to the vnode mounted on as argument, 370 * not special file (as before). 371 */ 372 /* ARGSUSED */ 373 int 374 sys_unmount(p, v, retval) 375 struct proc *p; 376 void *v; 377 register_t *retval; 378 { 379 register struct sys_unmount_args /* { 380 syscallarg(const char *) path; 381 syscallarg(int) flags; 382 } */ *uap = v; 383 register struct vnode *vp; 384 struct mount *mp; 385 int error; 386 struct nameidata nd; 387 388 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 389 SCARG(uap, path), p); 390 if ((error = namei(&nd)) != 0) 391 return (error); 392 vp = nd.ni_vp; 393 mp = vp->v_mount; 394 395 /* 396 * Only root, or the user that did the original mount is 397 * permitted to unmount this filesystem. 398 */ 399 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 400 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 401 vput(vp); 402 return (error); 403 } 404 405 /* 406 * Don't allow unmounting the root file system. 407 */ 408 if (mp->mnt_flag & MNT_ROOTFS) { 409 vput(vp); 410 return (EINVAL); 411 } 412 413 /* 414 * Must be the root of the filesystem 415 */ 416 if ((vp->v_flag & VROOT) == 0) { 417 vput(vp); 418 return (EINVAL); 419 } 420 vput(vp); 421 422 if (vfs_busy(mp, 0, 0)) 423 return (EBUSY); 424 425 return (dounmount(mp, SCARG(uap, flags), p)); 426 } 427 428 /* 429 * Do the actual file system unmount. File system is assumed to have been 430 * marked busy by the caller. 431 */ 432 int 433 dounmount(mp, flags, p) 434 register struct mount *mp; 435 int flags; 436 struct proc *p; 437 { 438 struct vnode *coveredvp; 439 int error; 440 441 simple_lock(&mountlist_slock); 442 mp->mnt_flag |= MNT_UNMOUNT; 443 vfs_unbusy(mp); 444 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 445 if (mp->mnt_flag & MNT_EXPUBLIC) 446 vfs_setpublicfs(NULL, NULL, NULL); 447 mp->mnt_flag &=~ MNT_ASYNC; 448 #if !defined(UVM) 449 vnode_pager_umount(mp); /* release cached vnodes */ 450 #endif 451 cache_purgevfs(mp); /* remove cache entries for this file sys */ 452 if (((mp->mnt_flag & MNT_RDONLY) || 453 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 454 (flags & MNT_FORCE)) 455 error = VFS_UNMOUNT(mp, flags, p); 456 simple_lock(&mountlist_slock); 457 if (error) { 458 mp->mnt_flag &= ~MNT_UNMOUNT; 459 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 460 &mountlist_slock); 461 if (mp->mnt_flag & MNT_MWAIT) 462 wakeup((caddr_t)mp); 463 return (error); 464 } 465 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 466 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 467 coveredvp->v_mountedhere = NULL; 468 vrele(coveredvp); 469 } 470 mp->mnt_op->vfs_refcount--; 471 if (mp->mnt_vnodelist.lh_first != NULL) 472 panic("unmount: dangling vnode"); 473 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 474 if (mp->mnt_flag & MNT_MWAIT) 475 wakeup((caddr_t)mp); 476 free((caddr_t)mp, M_MOUNT); 477 return (0); 478 } 479 480 /* 481 * Sync each mounted filesystem. 482 */ 483 #ifdef DEBUG 484 int syncprt = 0; 485 struct ctldebug debug0 = { "syncprt", &syncprt }; 486 #endif 487 488 /* ARGSUSED */ 489 int 490 sys_sync(p, v, retval) 491 struct proc *p; 492 void *v; 493 register_t *retval; 494 { 495 register struct mount *mp, *nmp; 496 int asyncflag; 497 498 simple_lock(&mountlist_slock); 499 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 500 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 501 nmp = mp->mnt_list.cqe_prev; 502 continue; 503 } 504 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 505 asyncflag = mp->mnt_flag & MNT_ASYNC; 506 mp->mnt_flag &= ~MNT_ASYNC; 507 #if defined(UVM) 508 uvm_vnp_sync(mp); 509 #else 510 vnode_pager_sync(mp); 511 #endif 512 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 513 if (asyncflag) 514 mp->mnt_flag |= MNT_ASYNC; 515 } 516 simple_lock(&mountlist_slock); 517 nmp = mp->mnt_list.cqe_prev; 518 vfs_unbusy(mp); 519 520 } 521 simple_unlock(&mountlist_slock); 522 #ifdef DEBUG 523 if (syncprt) 524 vfs_bufstats(); 525 #endif /* DEBUG */ 526 return (0); 527 } 528 529 /* 530 * Change filesystem quotas. 531 */ 532 /* ARGSUSED */ 533 int 534 sys_quotactl(p, v, retval) 535 struct proc *p; 536 void *v; 537 register_t *retval; 538 { 539 register struct sys_quotactl_args /* { 540 syscallarg(const char *) path; 541 syscallarg(int) cmd; 542 syscallarg(int) uid; 543 syscallarg(caddr_t) arg; 544 } */ *uap = v; 545 register struct mount *mp; 546 int error; 547 struct nameidata nd; 548 549 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 550 if ((error = namei(&nd)) != 0) 551 return (error); 552 mp = nd.ni_vp->v_mount; 553 vrele(nd.ni_vp); 554 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 555 SCARG(uap, arg), p)); 556 } 557 558 /* 559 * Get filesystem statistics. 560 */ 561 /* ARGSUSED */ 562 int 563 sys_statfs(p, v, retval) 564 struct proc *p; 565 void *v; 566 register_t *retval; 567 { 568 register struct sys_statfs_args /* { 569 syscallarg(const char *) path; 570 syscallarg(struct statfs *) buf; 571 } */ *uap = v; 572 register struct mount *mp; 573 register struct statfs *sp; 574 int error; 575 struct nameidata nd; 576 577 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 578 if ((error = namei(&nd)) != 0) 579 return (error); 580 mp = nd.ni_vp->v_mount; 581 sp = &mp->mnt_stat; 582 vrele(nd.ni_vp); 583 if ((error = VFS_STATFS(mp, sp, p)) != 0) 584 return (error); 585 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 586 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 587 } 588 589 /* 590 * Get filesystem statistics. 591 */ 592 /* ARGSUSED */ 593 int 594 sys_fstatfs(p, v, retval) 595 struct proc *p; 596 void *v; 597 register_t *retval; 598 { 599 register struct sys_fstatfs_args /* { 600 syscallarg(int) fd; 601 syscallarg(struct statfs *) buf; 602 } */ *uap = v; 603 struct file *fp; 604 struct mount *mp; 605 register struct statfs *sp; 606 int error; 607 608 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 609 return (error); 610 mp = ((struct vnode *)fp->f_data)->v_mount; 611 sp = &mp->mnt_stat; 612 if ((error = VFS_STATFS(mp, sp, p)) != 0) 613 return (error); 614 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 615 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 616 } 617 618 /* 619 * Get statistics on all filesystems. 620 */ 621 int 622 sys_getfsstat(p, v, retval) 623 struct proc *p; 624 void *v; 625 register_t *retval; 626 { 627 register struct sys_getfsstat_args /* { 628 syscallarg(struct statfs *) buf; 629 syscallarg(long) bufsize; 630 syscallarg(int) flags; 631 } */ *uap = v; 632 register struct mount *mp, *nmp; 633 register struct statfs *sp; 634 caddr_t sfsp; 635 long count, maxcount, error; 636 637 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 638 sfsp = (caddr_t)SCARG(uap, buf); 639 simple_lock(&mountlist_slock); 640 count = 0; 641 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 642 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 643 nmp = mp->mnt_list.cqe_next; 644 continue; 645 } 646 if (sfsp && count < maxcount) { 647 sp = &mp->mnt_stat; 648 /* 649 * If MNT_NOWAIT is specified, do not refresh the 650 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 651 */ 652 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 653 (SCARG(uap, flags) & MNT_WAIT)) && 654 (error = VFS_STATFS(mp, sp, p)) != 0) { 655 simple_lock(&mountlist_slock); 656 nmp = mp->mnt_list.cqe_next; 657 vfs_unbusy(mp); 658 continue; 659 } 660 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 661 error = copyout(sp, sfsp, sizeof(*sp)); 662 if (error) 663 return (error); 664 sfsp += sizeof(*sp); 665 } 666 count++; 667 simple_lock(&mountlist_slock); 668 nmp = mp->mnt_list.cqe_next; 669 vfs_unbusy(mp); 670 } 671 simple_unlock(&mountlist_slock); 672 if (sfsp && count > maxcount) 673 *retval = maxcount; 674 else 675 *retval = count; 676 return (0); 677 } 678 679 /* 680 * Change current working directory to a given file descriptor. 681 */ 682 /* ARGSUSED */ 683 int 684 sys_fchdir(p, v, retval) 685 struct proc *p; 686 void *v; 687 register_t *retval; 688 { 689 struct sys_fchdir_args /* { 690 syscallarg(int) fd; 691 } */ *uap = v; 692 register struct filedesc *fdp = p->p_fd; 693 struct vnode *vp, *tdp; 694 struct mount *mp; 695 struct file *fp; 696 int error; 697 698 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 699 return (error); 700 vp = (struct vnode *)fp->f_data; 701 VREF(vp); 702 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 703 if (vp->v_type != VDIR) 704 error = ENOTDIR; 705 else 706 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 707 while (!error && (mp = vp->v_mountedhere) != NULL) { 708 if (vfs_busy(mp, 0, 0)) 709 continue; 710 error = VFS_ROOT(mp, &tdp); 711 vfs_unbusy(mp); 712 if (error) 713 break; 714 vput(vp); 715 vp = tdp; 716 } 717 if (error) { 718 vput(vp); 719 return (error); 720 } 721 VOP_UNLOCK(vp, 0); 722 vrele(fdp->fd_cdir); 723 fdp->fd_cdir = vp; 724 return (0); 725 } 726 727 /* 728 * Change current working directory (``.''). 729 */ 730 /* ARGSUSED */ 731 int 732 sys_chdir(p, v, retval) 733 struct proc *p; 734 void *v; 735 register_t *retval; 736 { 737 struct sys_chdir_args /* { 738 syscallarg(const char *) path; 739 } */ *uap = v; 740 register struct filedesc *fdp = p->p_fd; 741 int error; 742 struct nameidata nd; 743 744 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 745 SCARG(uap, path), p); 746 if ((error = change_dir(&nd, p)) != 0) 747 return (error); 748 vrele(fdp->fd_cdir); 749 fdp->fd_cdir = nd.ni_vp; 750 return (0); 751 } 752 753 /* 754 * Change notion of root (``/'') directory. 755 */ 756 /* ARGSUSED */ 757 int 758 sys_chroot(p, v, retval) 759 struct proc *p; 760 void *v; 761 register_t *retval; 762 { 763 struct sys_chroot_args /* { 764 syscallarg(const char *) path; 765 } */ *uap = v; 766 register struct filedesc *fdp = p->p_fd; 767 int error; 768 struct nameidata nd; 769 770 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 771 return (error); 772 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 773 SCARG(uap, path), p); 774 if ((error = change_dir(&nd, p)) != 0) 775 return (error); 776 if (fdp->fd_rdir != NULL) 777 vrele(fdp->fd_rdir); 778 fdp->fd_rdir = nd.ni_vp; 779 return (0); 780 } 781 782 /* 783 * Common routine for chroot and chdir. 784 */ 785 static int 786 change_dir(ndp, p) 787 register struct nameidata *ndp; 788 struct proc *p; 789 { 790 struct vnode *vp; 791 int error; 792 793 if ((error = namei(ndp)) != 0) 794 return (error); 795 vp = ndp->ni_vp; 796 if (vp->v_type != VDIR) 797 error = ENOTDIR; 798 else 799 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 800 801 if (error) 802 vput(vp); 803 else 804 VOP_UNLOCK(vp, 0); 805 return (error); 806 } 807 808 /* 809 * Check permissions, allocate an open file structure, 810 * and call the device open routine if any. 811 */ 812 int 813 sys_open(p, v, retval) 814 struct proc *p; 815 void *v; 816 register_t *retval; 817 { 818 register struct sys_open_args /* { 819 syscallarg(const char *) path; 820 syscallarg(int) flags; 821 syscallarg(int) mode; 822 } */ *uap = v; 823 register struct filedesc *fdp = p->p_fd; 824 register struct file *fp; 825 register struct vnode *vp; 826 int flags, cmode; 827 struct file *nfp; 828 int type, indx, error; 829 struct flock lf; 830 struct nameidata nd; 831 extern struct fileops vnops; 832 833 flags = FFLAGS(SCARG(uap, flags)); 834 if ((flags & (FREAD | FWRITE)) == 0) 835 return (EINVAL); 836 if ((error = falloc(p, &nfp, &indx)) != 0) 837 return (error); 838 fp = nfp; 839 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 840 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 841 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 842 if ((error = vn_open(&nd, flags, cmode)) != 0) { 843 ffree(fp); 844 if ((error == ENODEV || error == ENXIO) && 845 p->p_dupfd >= 0 && /* XXX from fdopen */ 846 (error = 847 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 848 *retval = indx; 849 return (0); 850 } 851 if (error == ERESTART) 852 error = EINTR; 853 fdp->fd_ofiles[indx] = NULL; 854 return (error); 855 } 856 p->p_dupfd = 0; 857 vp = nd.ni_vp; 858 fp->f_flag = flags & FMASK; 859 fp->f_type = DTYPE_VNODE; 860 fp->f_ops = &vnops; 861 fp->f_data = (caddr_t)vp; 862 if (flags & (O_EXLOCK | O_SHLOCK)) { 863 lf.l_whence = SEEK_SET; 864 lf.l_start = 0; 865 lf.l_len = 0; 866 if (flags & O_EXLOCK) 867 lf.l_type = F_WRLCK; 868 else 869 lf.l_type = F_RDLCK; 870 type = F_FLOCK; 871 if ((flags & FNONBLOCK) == 0) 872 type |= F_WAIT; 873 VOP_UNLOCK(vp, 0); 874 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 875 if (error) { 876 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 877 ffree(fp); 878 fdp->fd_ofiles[indx] = NULL; 879 return (error); 880 } 881 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 882 fp->f_flag |= FHASLOCK; 883 } 884 VOP_UNLOCK(vp, 0); 885 *retval = indx; 886 return (0); 887 } 888 889 /* 890 * Create a special file. 891 */ 892 /* ARGSUSED */ 893 int 894 sys_mknod(p, v, retval) 895 struct proc *p; 896 void *v; 897 register_t *retval; 898 { 899 register struct sys_mknod_args /* { 900 syscallarg(const char *) path; 901 syscallarg(int) mode; 902 syscallarg(int) dev; 903 } */ *uap = v; 904 register struct vnode *vp; 905 struct vattr vattr; 906 int error; 907 int whiteout = 0; 908 struct nameidata nd; 909 910 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 911 return (error); 912 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 913 if ((error = namei(&nd)) != 0) 914 return (error); 915 vp = nd.ni_vp; 916 if (vp != NULL) 917 error = EEXIST; 918 else { 919 VATTR_NULL(&vattr); 920 vattr.va_mode = 921 (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 922 vattr.va_rdev = SCARG(uap, dev); 923 whiteout = 0; 924 925 switch (SCARG(uap, mode) & S_IFMT) { 926 case S_IFMT: /* used by badsect to flag bad sectors */ 927 vattr.va_type = VBAD; 928 break; 929 case S_IFCHR: 930 vattr.va_type = VCHR; 931 break; 932 case S_IFBLK: 933 vattr.va_type = VBLK; 934 break; 935 case S_IFWHT: 936 whiteout = 1; 937 break; 938 default: 939 error = EINVAL; 940 break; 941 } 942 } 943 if (!error) { 944 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 945 if (whiteout) { 946 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 947 if (error) 948 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 949 vput(nd.ni_dvp); 950 } else { 951 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 952 &nd.ni_cnd, &vattr); 953 } 954 } else { 955 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 956 if (nd.ni_dvp == vp) 957 vrele(nd.ni_dvp); 958 else 959 vput(nd.ni_dvp); 960 if (vp) 961 vrele(vp); 962 } 963 return (error); 964 } 965 966 /* 967 * Create a named pipe. 968 */ 969 /* ARGSUSED */ 970 int 971 sys_mkfifo(p, v, retval) 972 struct proc *p; 973 void *v; 974 register_t *retval; 975 { 976 register struct sys_mkfifo_args /* { 977 syscallarg(const char *) path; 978 syscallarg(int) mode; 979 } */ *uap = v; 980 struct vattr vattr; 981 int error; 982 struct nameidata nd; 983 984 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 985 if ((error = namei(&nd)) != 0) 986 return (error); 987 if (nd.ni_vp != NULL) { 988 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 989 if (nd.ni_dvp == nd.ni_vp) 990 vrele(nd.ni_dvp); 991 else 992 vput(nd.ni_dvp); 993 vrele(nd.ni_vp); 994 return (EEXIST); 995 } 996 VATTR_NULL(&vattr); 997 vattr.va_type = VFIFO; 998 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 999 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1000 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1001 } 1002 1003 /* 1004 * Make a hard file link. 1005 */ 1006 /* ARGSUSED */ 1007 int 1008 sys_link(p, v, retval) 1009 struct proc *p; 1010 void *v; 1011 register_t *retval; 1012 { 1013 register struct sys_link_args /* { 1014 syscallarg(const char *) path; 1015 syscallarg(const char *) link; 1016 } */ *uap = v; 1017 register struct vnode *vp; 1018 struct nameidata nd; 1019 int error; 1020 1021 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1022 if ((error = namei(&nd)) != 0) 1023 return (error); 1024 vp = nd.ni_vp; 1025 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1026 if ((error = namei(&nd)) != 0) 1027 goto out; 1028 if (nd.ni_vp) { 1029 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1030 if (nd.ni_dvp == nd.ni_vp) 1031 vrele(nd.ni_dvp); 1032 else 1033 vput(nd.ni_dvp); 1034 vrele(nd.ni_vp); 1035 error = EEXIST; 1036 goto out; 1037 } 1038 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1039 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1040 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1041 out: 1042 vrele(vp); 1043 return (error); 1044 } 1045 1046 /* 1047 * Make a symbolic link. 1048 */ 1049 /* ARGSUSED */ 1050 int 1051 sys_symlink(p, v, retval) 1052 struct proc *p; 1053 void *v; 1054 register_t *retval; 1055 { 1056 register struct sys_symlink_args /* { 1057 syscallarg(const char *) path; 1058 syscallarg(const char *) link; 1059 } */ *uap = v; 1060 struct vattr vattr; 1061 char *path; 1062 int error; 1063 struct nameidata nd; 1064 1065 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1066 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1067 if (error) 1068 goto out; 1069 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1070 if ((error = namei(&nd)) != 0) 1071 goto out; 1072 if (nd.ni_vp) { 1073 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1074 if (nd.ni_dvp == nd.ni_vp) 1075 vrele(nd.ni_dvp); 1076 else 1077 vput(nd.ni_dvp); 1078 vrele(nd.ni_vp); 1079 error = EEXIST; 1080 goto out; 1081 } 1082 VATTR_NULL(&vattr); 1083 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1084 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1085 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1086 out: 1087 FREE(path, M_NAMEI); 1088 return (error); 1089 } 1090 1091 /* 1092 * Delete a whiteout from the filesystem. 1093 */ 1094 /* ARGSUSED */ 1095 int 1096 sys_undelete(p, v, retval) 1097 struct proc *p; 1098 void *v; 1099 register_t *retval; 1100 { 1101 register struct sys_undelete_args /* { 1102 syscallarg(const char *) path; 1103 } */ *uap = v; 1104 int error; 1105 struct nameidata nd; 1106 1107 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1108 SCARG(uap, path), p); 1109 error = namei(&nd); 1110 if (error) 1111 return (error); 1112 1113 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1114 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1115 if (nd.ni_dvp == nd.ni_vp) 1116 vrele(nd.ni_dvp); 1117 else 1118 vput(nd.ni_dvp); 1119 if (nd.ni_vp) 1120 vrele(nd.ni_vp); 1121 return (EEXIST); 1122 } 1123 1124 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1125 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1126 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1127 vput(nd.ni_dvp); 1128 return (error); 1129 } 1130 1131 /* 1132 * Delete a name from the filesystem. 1133 */ 1134 /* ARGSUSED */ 1135 int 1136 sys_unlink(p, v, retval) 1137 struct proc *p; 1138 void *v; 1139 register_t *retval; 1140 { 1141 struct sys_unlink_args /* { 1142 syscallarg(const char *) path; 1143 } */ *uap = v; 1144 register struct vnode *vp; 1145 int error; 1146 struct nameidata nd; 1147 1148 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1149 SCARG(uap, path), p); 1150 if ((error = namei(&nd)) != 0) 1151 return (error); 1152 vp = nd.ni_vp; 1153 1154 /* 1155 * The root of a mounted filesystem cannot be deleted. 1156 */ 1157 if (vp->v_flag & VROOT) { 1158 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1159 if (nd.ni_dvp == vp) 1160 vrele(nd.ni_dvp); 1161 else 1162 vput(nd.ni_dvp); 1163 vput(vp); 1164 error = EBUSY; 1165 goto out; 1166 } 1167 1168 #if defined(UVM) 1169 (void)uvm_vnp_uncache(vp); 1170 #else 1171 (void)vnode_pager_uncache(vp); 1172 #endif 1173 1174 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1175 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1176 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1177 out: 1178 return (error); 1179 } 1180 1181 /* 1182 * Reposition read/write file offset. 1183 */ 1184 int 1185 sys_lseek(p, v, retval) 1186 struct proc *p; 1187 void *v; 1188 register_t *retval; 1189 { 1190 register struct sys_lseek_args /* { 1191 syscallarg(int) fd; 1192 syscallarg(int) pad; 1193 syscallarg(off_t) offset; 1194 syscallarg(int) whence; 1195 } */ *uap = v; 1196 struct ucred *cred = p->p_ucred; 1197 register struct filedesc *fdp = p->p_fd; 1198 register struct file *fp; 1199 struct vnode *vp; 1200 struct vattr vattr; 1201 register off_t newoff; 1202 int error; 1203 1204 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1205 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1206 return (EBADF); 1207 1208 vp = (struct vnode *)fp->f_data; 1209 if (fp->f_type != DTYPE_VNODE 1210 || vp->v_type == VFIFO) 1211 return (ESPIPE); 1212 1213 switch (SCARG(uap, whence)) { 1214 case SEEK_CUR: 1215 newoff = fp->f_offset + SCARG(uap, offset); 1216 break; 1217 case SEEK_END: 1218 error = VOP_GETATTR(vp, &vattr, cred, p); 1219 if (error) 1220 return (error); 1221 newoff = SCARG(uap, offset) + vattr.va_size; 1222 break; 1223 case SEEK_SET: 1224 newoff = SCARG(uap, offset); 1225 break; 1226 default: 1227 return (EINVAL); 1228 } 1229 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1230 return (error); 1231 1232 *(off_t *)retval = fp->f_offset = newoff; 1233 return (0); 1234 } 1235 1236 /* 1237 * Positional read system call. 1238 */ 1239 int 1240 sys_pread(p, v, retval) 1241 struct proc *p; 1242 void *v; 1243 register_t *retval; 1244 { 1245 struct sys_pread_args /* { 1246 syscallarg(int) fd; 1247 syscallarg(void *) buf; 1248 syscallarg(size_t) nbyte; 1249 syscallarg(off_t) offset; 1250 } */ *uap = v; 1251 struct filedesc *fdp = p->p_fd; 1252 struct file *fp; 1253 struct vnode *vp; 1254 off_t offset; 1255 int error, fd = SCARG(uap, fd); 1256 1257 if ((u_int)fd >= fdp->fd_nfiles || 1258 (fp = fdp->fd_ofiles[fd]) == NULL || 1259 (fp->f_flag & FREAD) == 0) 1260 return (EBADF); 1261 1262 vp = (struct vnode *)fp->f_data; 1263 if (fp->f_type != DTYPE_VNODE 1264 || vp->v_type == VFIFO) 1265 return (ESPIPE); 1266 1267 offset = SCARG(uap, offset); 1268 1269 /* 1270 * XXX This works because no file systems actually 1271 * XXX take any action on the seek operation. 1272 */ 1273 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1274 return (error); 1275 1276 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1277 &offset, 0, retval)); 1278 } 1279 1280 /* 1281 * Positional scatter read system call. 1282 */ 1283 int 1284 sys_preadv(p, v, retval) 1285 struct proc *p; 1286 void *v; 1287 register_t *retval; 1288 { 1289 struct sys_preadv_args /* { 1290 syscallarg(int) fd; 1291 syscallarg(const struct iovec *) iovp; 1292 syscallarg(int) iovcnt; 1293 syscallarg(off_t) offset; 1294 } */ *uap = v; 1295 struct filedesc *fdp = p->p_fd; 1296 struct file *fp; 1297 struct vnode *vp; 1298 off_t offset; 1299 int error, fd = SCARG(uap, fd); 1300 1301 if ((u_int)fd >= fdp->fd_nfiles || 1302 (fp = fdp->fd_ofiles[fd]) == NULL || 1303 (fp->f_flag & FREAD) == 0) 1304 return (EBADF); 1305 1306 vp = (struct vnode *)fp->f_data; 1307 if (fp->f_type != DTYPE_VNODE 1308 || vp->v_type == VFIFO) 1309 return (ESPIPE); 1310 1311 offset = SCARG(uap, offset); 1312 1313 /* 1314 * XXX This works because no file systems actually 1315 * XXX take any action on the seek operation. 1316 */ 1317 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1318 return (error); 1319 1320 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1321 &offset, 0, retval)); 1322 } 1323 1324 /* 1325 * Positional write system call. 1326 */ 1327 int 1328 sys_pwrite(p, v, retval) 1329 struct proc *p; 1330 void *v; 1331 register_t *retval; 1332 { 1333 struct sys_pwrite_args /* { 1334 syscallarg(int) fd; 1335 syscallarg(const void *) buf; 1336 syscallarg(size_t) nbyte; 1337 syscallarg(off_t) offset; 1338 } */ *uap = v; 1339 struct filedesc *fdp = p->p_fd; 1340 struct file *fp; 1341 struct vnode *vp; 1342 off_t offset; 1343 int error, fd = SCARG(uap, fd); 1344 1345 if ((u_int)fd >= fdp->fd_nfiles || 1346 (fp = fdp->fd_ofiles[fd]) == NULL || 1347 (fp->f_flag & FWRITE) == 0) 1348 return (EBADF); 1349 1350 vp = (struct vnode *)fp->f_data; 1351 if (fp->f_type != DTYPE_VNODE 1352 || vp->v_type == VFIFO) 1353 return (ESPIPE); 1354 1355 offset = SCARG(uap, offset); 1356 1357 /* 1358 * XXX This works because no file systems actually 1359 * XXX take any action on the seek operation. 1360 */ 1361 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1362 return (error); 1363 1364 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1365 &offset, 0, retval)); 1366 } 1367 1368 /* 1369 * Positional gather write system call. 1370 */ 1371 int 1372 sys_pwritev(p, v, retval) 1373 struct proc *p; 1374 void *v; 1375 register_t *retval; 1376 { 1377 struct sys_pwritev_args /* { 1378 syscallarg(int) fd; 1379 syscallarg(const struct iovec *) iovp; 1380 syscallarg(int) iovcnt; 1381 syscallarg(off_t) offset; 1382 } */ *uap = v; 1383 struct filedesc *fdp = p->p_fd; 1384 struct file *fp; 1385 struct vnode *vp; 1386 off_t offset; 1387 int error, fd = SCARG(uap, fd); 1388 1389 if ((u_int)fd >= fdp->fd_nfiles || 1390 (fp = fdp->fd_ofiles[fd]) == NULL || 1391 (fp->f_flag & FWRITE) == 0) 1392 return (EBADF); 1393 1394 vp = (struct vnode *)fp->f_data; 1395 if (fp->f_type != DTYPE_VNODE 1396 || vp->v_type == VFIFO) 1397 return (ESPIPE); 1398 1399 offset = SCARG(uap, offset); 1400 1401 /* 1402 * XXX This works because no file systems actually 1403 * XXX take any action on the seek operation. 1404 */ 1405 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1406 return (error); 1407 1408 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1409 &offset, 0, retval)); 1410 } 1411 1412 /* 1413 * Check access permissions. 1414 */ 1415 int 1416 sys_access(p, v, retval) 1417 struct proc *p; 1418 void *v; 1419 register_t *retval; 1420 { 1421 register struct sys_access_args /* { 1422 syscallarg(const char *) path; 1423 syscallarg(int) flags; 1424 } */ *uap = v; 1425 register struct ucred *cred = p->p_ucred; 1426 register struct vnode *vp; 1427 int error, flags, t_gid, t_uid; 1428 struct nameidata nd; 1429 1430 t_uid = cred->cr_uid; 1431 t_gid = cred->cr_gid; 1432 cred->cr_uid = p->p_cred->p_ruid; 1433 cred->cr_gid = p->p_cred->p_rgid; 1434 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1435 SCARG(uap, path), p); 1436 if ((error = namei(&nd)) != 0) 1437 goto out1; 1438 vp = nd.ni_vp; 1439 1440 /* Flags == 0 means only check for existence. */ 1441 if (SCARG(uap, flags)) { 1442 flags = 0; 1443 if (SCARG(uap, flags) & R_OK) 1444 flags |= VREAD; 1445 if (SCARG(uap, flags) & W_OK) 1446 flags |= VWRITE; 1447 if (SCARG(uap, flags) & X_OK) 1448 flags |= VEXEC; 1449 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1450 error = VOP_ACCESS(vp, flags, cred, p); 1451 } 1452 vput(vp); 1453 out1: 1454 cred->cr_uid = t_uid; 1455 cred->cr_gid = t_gid; 1456 return (error); 1457 } 1458 1459 /* 1460 * Get file status; this version follows links. 1461 */ 1462 /* ARGSUSED */ 1463 int 1464 sys___stat13(p, v, retval) 1465 struct proc *p; 1466 void *v; 1467 register_t *retval; 1468 { 1469 register struct sys___stat13_args /* { 1470 syscallarg(const char *) path; 1471 syscallarg(struct stat *) ub; 1472 } */ *uap = v; 1473 struct stat sb; 1474 int error; 1475 struct nameidata nd; 1476 1477 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1478 SCARG(uap, path), p); 1479 if ((error = namei(&nd)) != 0) 1480 return (error); 1481 error = vn_stat(nd.ni_vp, &sb, p); 1482 vput(nd.ni_vp); 1483 if (error) 1484 return (error); 1485 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1486 return (error); 1487 } 1488 1489 /* 1490 * Get file status; this version does not follow links. 1491 */ 1492 /* ARGSUSED */ 1493 int 1494 sys___lstat13(p, v, retval) 1495 struct proc *p; 1496 void *v; 1497 register_t *retval; 1498 { 1499 register struct sys___lstat13_args /* { 1500 syscallarg(const char *) path; 1501 syscallarg(struct stat *) ub; 1502 } */ *uap = v; 1503 struct stat sb; 1504 int error; 1505 struct nameidata nd; 1506 1507 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1508 SCARG(uap, path), p); 1509 if ((error = namei(&nd)) != 0) 1510 return (error); 1511 error = vn_stat(nd.ni_vp, &sb, p); 1512 vput(nd.ni_vp); 1513 if (error) 1514 return (error); 1515 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1516 return (error); 1517 } 1518 1519 /* 1520 * Get configurable pathname variables. 1521 */ 1522 /* ARGSUSED */ 1523 int 1524 sys_pathconf(p, v, retval) 1525 struct proc *p; 1526 void *v; 1527 register_t *retval; 1528 { 1529 register struct sys_pathconf_args /* { 1530 syscallarg(const char *) path; 1531 syscallarg(int) name; 1532 } */ *uap = v; 1533 int error; 1534 struct nameidata nd; 1535 1536 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1537 SCARG(uap, path), p); 1538 if ((error = namei(&nd)) != 0) 1539 return (error); 1540 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1541 vput(nd.ni_vp); 1542 return (error); 1543 } 1544 1545 /* 1546 * Return target name of a symbolic link. 1547 */ 1548 /* ARGSUSED */ 1549 int 1550 sys_readlink(p, v, retval) 1551 struct proc *p; 1552 void *v; 1553 register_t *retval; 1554 { 1555 register struct sys_readlink_args /* { 1556 syscallarg(const char *) path; 1557 syscallarg(char *) buf; 1558 syscallarg(size_t) count; 1559 } */ *uap = v; 1560 register struct vnode *vp; 1561 struct iovec aiov; 1562 struct uio auio; 1563 int error; 1564 struct nameidata nd; 1565 1566 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1567 SCARG(uap, path), p); 1568 if ((error = namei(&nd)) != 0) 1569 return (error); 1570 vp = nd.ni_vp; 1571 if (vp->v_type != VLNK) 1572 error = EINVAL; 1573 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1574 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1575 aiov.iov_base = SCARG(uap, buf); 1576 aiov.iov_len = SCARG(uap, count); 1577 auio.uio_iov = &aiov; 1578 auio.uio_iovcnt = 1; 1579 auio.uio_offset = 0; 1580 auio.uio_rw = UIO_READ; 1581 auio.uio_segflg = UIO_USERSPACE; 1582 auio.uio_procp = p; 1583 auio.uio_resid = SCARG(uap, count); 1584 error = VOP_READLINK(vp, &auio, p->p_ucred); 1585 } 1586 vput(vp); 1587 *retval = SCARG(uap, count) - auio.uio_resid; 1588 return (error); 1589 } 1590 1591 /* 1592 * Change flags of a file given a path name. 1593 */ 1594 /* ARGSUSED */ 1595 int 1596 sys_chflags(p, v, retval) 1597 struct proc *p; 1598 void *v; 1599 register_t *retval; 1600 { 1601 register struct sys_chflags_args /* { 1602 syscallarg(const char *) path; 1603 syscallarg(u_long) flags; 1604 } */ *uap = v; 1605 register struct vnode *vp; 1606 struct vattr vattr; 1607 int error; 1608 struct nameidata nd; 1609 1610 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1611 if ((error = namei(&nd)) != 0) 1612 return (error); 1613 vp = nd.ni_vp; 1614 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1615 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1616 VATTR_NULL(&vattr); 1617 vattr.va_flags = SCARG(uap, flags); 1618 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1619 vput(vp); 1620 return (error); 1621 } 1622 1623 /* 1624 * Change flags of a file given a file descriptor. 1625 */ 1626 /* ARGSUSED */ 1627 int 1628 sys_fchflags(p, v, retval) 1629 struct proc *p; 1630 void *v; 1631 register_t *retval; 1632 { 1633 register struct sys_fchflags_args /* { 1634 syscallarg(int) fd; 1635 syscallarg(u_long) flags; 1636 } */ *uap = v; 1637 struct vattr vattr; 1638 struct vnode *vp; 1639 struct file *fp; 1640 int error; 1641 1642 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1643 return (error); 1644 vp = (struct vnode *)fp->f_data; 1645 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1646 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1647 VATTR_NULL(&vattr); 1648 vattr.va_flags = SCARG(uap, flags); 1649 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1650 VOP_UNLOCK(vp, 0); 1651 return (error); 1652 } 1653 1654 /* 1655 * Change mode of a file given path name; this version follows links. 1656 */ 1657 /* ARGSUSED */ 1658 int 1659 sys_chmod(p, v, retval) 1660 struct proc *p; 1661 void *v; 1662 register_t *retval; 1663 { 1664 register struct sys_chmod_args /* { 1665 syscallarg(const char *) path; 1666 syscallarg(int) mode; 1667 } */ *uap = v; 1668 int error; 1669 struct nameidata nd; 1670 1671 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1672 if ((error = namei(&nd)) != 0) 1673 return (error); 1674 1675 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1676 1677 vrele(nd.ni_vp); 1678 return (error); 1679 } 1680 1681 /* 1682 * Change mode of a file given a file descriptor. 1683 */ 1684 /* ARGSUSED */ 1685 int 1686 sys_fchmod(p, v, retval) 1687 struct proc *p; 1688 void *v; 1689 register_t *retval; 1690 { 1691 register struct sys_fchmod_args /* { 1692 syscallarg(int) fd; 1693 syscallarg(int) mode; 1694 } */ *uap = v; 1695 struct file *fp; 1696 int error; 1697 1698 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1699 return (error); 1700 1701 return (change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p)); 1702 } 1703 1704 /* 1705 * Change mode of a file given path name; this version does not follow links. 1706 */ 1707 /* ARGSUSED */ 1708 int 1709 sys_lchmod(p, v, retval) 1710 struct proc *p; 1711 void *v; 1712 register_t *retval; 1713 { 1714 register struct sys_lchmod_args /* { 1715 syscallarg(const char *) path; 1716 syscallarg(int) mode; 1717 } */ *uap = v; 1718 int error; 1719 struct nameidata nd; 1720 1721 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1722 if ((error = namei(&nd)) != 0) 1723 return (error); 1724 1725 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1726 1727 vrele(nd.ni_vp); 1728 return (error); 1729 } 1730 1731 /* 1732 * Common routine to set mode given a vnode. 1733 */ 1734 static int 1735 change_mode(vp, mode, p) 1736 struct vnode *vp; 1737 int mode; 1738 struct proc *p; 1739 { 1740 struct vattr vattr; 1741 int error; 1742 1743 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1744 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1745 VATTR_NULL(&vattr); 1746 vattr.va_mode = mode & ALLPERMS; 1747 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1748 VOP_UNLOCK(vp, 0); 1749 return (error); 1750 } 1751 1752 /* 1753 * Set ownership given a path name; this version follows links. 1754 */ 1755 /* ARGSUSED */ 1756 int 1757 sys_chown(p, v, retval) 1758 struct proc *p; 1759 void *v; 1760 register_t *retval; 1761 { 1762 register struct sys_chown_args /* { 1763 syscallarg(const char *) path; 1764 syscallarg(uid_t) uid; 1765 syscallarg(gid_t) gid; 1766 } */ *uap = v; 1767 int error; 1768 struct nameidata nd; 1769 1770 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1771 if ((error = namei(&nd)) != 0) 1772 return (error); 1773 1774 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1775 1776 vrele(nd.ni_vp); 1777 return (error); 1778 } 1779 1780 /* 1781 * Set ownership given a path name; this version follows links. 1782 * Provides POSIX semantics. 1783 */ 1784 /* ARGSUSED */ 1785 int 1786 sys___posix_chown(p, v, retval) 1787 struct proc *p; 1788 void *v; 1789 register_t *retval; 1790 { 1791 register struct sys_chown_args /* { 1792 syscallarg(const char *) path; 1793 syscallarg(uid_t) uid; 1794 syscallarg(gid_t) gid; 1795 } */ *uap = v; 1796 int error; 1797 struct nameidata nd; 1798 1799 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1800 if ((error = namei(&nd)) != 0) 1801 return (error); 1802 1803 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 1804 1805 vrele(nd.ni_vp); 1806 return (error); 1807 } 1808 1809 /* 1810 * Set ownership given a file descriptor. 1811 */ 1812 /* ARGSUSED */ 1813 int 1814 sys_fchown(p, v, retval) 1815 struct proc *p; 1816 void *v; 1817 register_t *retval; 1818 { 1819 register struct sys_fchown_args /* { 1820 syscallarg(int) fd; 1821 syscallarg(uid_t) uid; 1822 syscallarg(gid_t) gid; 1823 } */ *uap = v; 1824 int error; 1825 struct file *fp; 1826 1827 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1828 return (error); 1829 1830 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1831 SCARG(uap, gid), p, 0)); 1832 } 1833 1834 /* 1835 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 1836 */ 1837 /* ARGSUSED */ 1838 int 1839 sys___posix_fchown(p, v, retval) 1840 struct proc *p; 1841 void *v; 1842 register_t *retval; 1843 { 1844 register struct sys_fchown_args /* { 1845 syscallarg(int) fd; 1846 syscallarg(uid_t) uid; 1847 syscallarg(gid_t) gid; 1848 } */ *uap = v; 1849 int error; 1850 struct file *fp; 1851 1852 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1853 return (error); 1854 1855 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1856 SCARG(uap, gid), p, 1)); 1857 } 1858 1859 /* 1860 * Set ownership given a path name; this version does not follow links. 1861 */ 1862 /* ARGSUSED */ 1863 int 1864 sys_lchown(p, v, retval) 1865 struct proc *p; 1866 void *v; 1867 register_t *retval; 1868 { 1869 register struct sys_lchown_args /* { 1870 syscallarg(const char *) path; 1871 syscallarg(uid_t) uid; 1872 syscallarg(gid_t) gid; 1873 } */ *uap = v; 1874 int error; 1875 struct nameidata nd; 1876 1877 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1878 if ((error = namei(&nd)) != 0) 1879 return (error); 1880 1881 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1882 1883 vrele(nd.ni_vp); 1884 return (error); 1885 } 1886 1887 /* 1888 * Set ownership given a path name; this version does not follow links. 1889 * Provides POSIX/XPG semantics. 1890 */ 1891 /* ARGSUSED */ 1892 int 1893 sys___posix_lchown(p, v, retval) 1894 struct proc *p; 1895 void *v; 1896 register_t *retval; 1897 { 1898 register struct sys_lchown_args /* { 1899 syscallarg(const char *) path; 1900 syscallarg(uid_t) uid; 1901 syscallarg(gid_t) gid; 1902 } */ *uap = v; 1903 int error; 1904 struct nameidata nd; 1905 1906 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1907 if ((error = namei(&nd)) != 0) 1908 return (error); 1909 1910 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 1911 1912 vrele(nd.ni_vp); 1913 return (error); 1914 } 1915 1916 /* 1917 * Common routine to set ownership given a vnode. 1918 */ 1919 static int 1920 change_owner(vp, uid, gid, p, posix_semantics) 1921 register struct vnode *vp; 1922 uid_t uid; 1923 gid_t gid; 1924 struct proc *p; 1925 int posix_semantics; 1926 { 1927 struct vattr vattr; 1928 mode_t newmode; 1929 int error; 1930 1931 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1932 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1933 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 1934 goto out; 1935 1936 #define CHANGED(x) ((x) != -1) 1937 newmode = vattr.va_mode; 1938 if (posix_semantics) { 1939 /* 1940 * POSIX/XPG semantics: if the caller is not the super-user, 1941 * clear set-user-id and set-group-id bits. Both POSIX and 1942 * the XPG consider the behaviour for calls by the super-user 1943 * implementation-defined; we leave the set-user-id and set- 1944 * group-id settings intact in that case. 1945 */ 1946 if (suser(p->p_ucred, NULL) != 0) 1947 newmode &= ~(S_ISUID | S_ISGID); 1948 } else { 1949 /* 1950 * NetBSD semantics: when changing owner and/or group, 1951 * clear the respective bit(s). 1952 */ 1953 if (CHANGED(uid)) 1954 newmode &= ~S_ISUID; 1955 if (CHANGED(gid)) 1956 newmode &= ~S_ISGID; 1957 } 1958 /* Update va_mode iff altered. */ 1959 if (vattr.va_mode == newmode) 1960 newmode = VNOVAL; 1961 1962 VATTR_NULL(&vattr); 1963 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 1964 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 1965 vattr.va_mode = newmode; 1966 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1967 #undef CHANGED 1968 1969 out: 1970 VOP_UNLOCK(vp, 0); 1971 return (error); 1972 } 1973 1974 /* 1975 * Set the access and modification times given a path name; this 1976 * version follows links. 1977 */ 1978 /* ARGSUSED */ 1979 int 1980 sys_utimes(p, v, retval) 1981 struct proc *p; 1982 void *v; 1983 register_t *retval; 1984 { 1985 register struct sys_utimes_args /* { 1986 syscallarg(const char *) path; 1987 syscallarg(const struct timeval *) tptr; 1988 } */ *uap = v; 1989 int error; 1990 struct nameidata nd; 1991 1992 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1993 if ((error = namei(&nd)) != 0) 1994 return (error); 1995 1996 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1997 1998 vrele(nd.ni_vp); 1999 return (error); 2000 } 2001 2002 /* 2003 * Set the access and modification times given a file descriptor. 2004 */ 2005 /* ARGSUSED */ 2006 int 2007 sys_futimes(p, v, retval) 2008 struct proc *p; 2009 void *v; 2010 register_t *retval; 2011 { 2012 register struct sys_futimes_args /* { 2013 syscallarg(int) fd; 2014 syscallarg(const struct timeval *) tptr; 2015 } */ *uap = v; 2016 int error; 2017 struct file *fp; 2018 2019 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2020 return (error); 2021 2022 return (change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), 2023 p)); 2024 } 2025 2026 /* 2027 * Set the access and modification times given a path name; this 2028 * version does not follow links. 2029 */ 2030 /* ARGSUSED */ 2031 int 2032 sys_lutimes(p, v, retval) 2033 struct proc *p; 2034 void *v; 2035 register_t *retval; 2036 { 2037 register struct sys_lutimes_args /* { 2038 syscallarg(const char *) path; 2039 syscallarg(const struct timeval *) tptr; 2040 } */ *uap = v; 2041 int error; 2042 struct nameidata nd; 2043 2044 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2045 if ((error = namei(&nd)) != 0) 2046 return (error); 2047 2048 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2049 2050 vrele(nd.ni_vp); 2051 return (error); 2052 } 2053 2054 /* 2055 * Common routine to set access and modification times given a vnode. 2056 */ 2057 static int 2058 change_utimes(vp, tptr, p) 2059 struct vnode *vp; 2060 const struct timeval *tptr; 2061 struct proc *p; 2062 { 2063 struct timeval tv[2]; 2064 struct vattr vattr; 2065 int error; 2066 2067 VATTR_NULL(&vattr); 2068 if (tptr == NULL) { 2069 microtime(&tv[0]); 2070 tv[1] = tv[0]; 2071 vattr.va_vaflags |= VA_UTIMES_NULL; 2072 } else { 2073 error = copyin(tptr, tv, sizeof(tv)); 2074 if (error) 2075 return (error); 2076 } 2077 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2078 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2079 vattr.va_atime.tv_sec = tv[0].tv_sec; 2080 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2081 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2082 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2083 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2084 VOP_UNLOCK(vp, 0); 2085 return (error); 2086 } 2087 2088 /* 2089 * Truncate a file given its path name. 2090 */ 2091 /* ARGSUSED */ 2092 int 2093 sys_truncate(p, v, retval) 2094 struct proc *p; 2095 void *v; 2096 register_t *retval; 2097 { 2098 register struct sys_truncate_args /* { 2099 syscallarg(const char *) path; 2100 syscallarg(int) pad; 2101 syscallarg(off_t) length; 2102 } */ *uap = v; 2103 register struct vnode *vp; 2104 struct vattr vattr; 2105 int error; 2106 struct nameidata nd; 2107 2108 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2109 if ((error = namei(&nd)) != 0) 2110 return (error); 2111 vp = nd.ni_vp; 2112 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2113 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2114 if (vp->v_type == VDIR) 2115 error = EISDIR; 2116 else if ((error = vn_writechk(vp)) == 0 && 2117 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2118 VATTR_NULL(&vattr); 2119 vattr.va_size = SCARG(uap, length); 2120 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2121 } 2122 vput(vp); 2123 return (error); 2124 } 2125 2126 /* 2127 * Truncate a file given a file descriptor. 2128 */ 2129 /* ARGSUSED */ 2130 int 2131 sys_ftruncate(p, v, retval) 2132 struct proc *p; 2133 void *v; 2134 register_t *retval; 2135 { 2136 register struct sys_ftruncate_args /* { 2137 syscallarg(int) fd; 2138 syscallarg(int) pad; 2139 syscallarg(off_t) length; 2140 } */ *uap = v; 2141 struct vattr vattr; 2142 struct vnode *vp; 2143 struct file *fp; 2144 int error; 2145 2146 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2147 return (error); 2148 if ((fp->f_flag & FWRITE) == 0) 2149 return (EINVAL); 2150 vp = (struct vnode *)fp->f_data; 2151 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2152 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2153 if (vp->v_type == VDIR) 2154 error = EISDIR; 2155 else if ((error = vn_writechk(vp)) == 0) { 2156 VATTR_NULL(&vattr); 2157 vattr.va_size = SCARG(uap, length); 2158 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2159 } 2160 VOP_UNLOCK(vp, 0); 2161 return (error); 2162 } 2163 2164 /* 2165 * Sync an open file. 2166 */ 2167 /* ARGSUSED */ 2168 int 2169 sys_fsync(p, v, retval) 2170 struct proc *p; 2171 void *v; 2172 register_t *retval; 2173 { 2174 struct sys_fsync_args /* { 2175 syscallarg(int) fd; 2176 } */ *uap = v; 2177 register struct vnode *vp; 2178 struct file *fp; 2179 int error; 2180 2181 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2182 return (error); 2183 vp = (struct vnode *)fp->f_data; 2184 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2185 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2186 VOP_UNLOCK(vp, 0); 2187 return (error); 2188 } 2189 2190 /* 2191 * Sync the data of an open file. 2192 */ 2193 /* ARGSUSED */ 2194 int 2195 sys_fdatasync(p, v, retval) 2196 struct proc *p; 2197 void *v; 2198 register_t *retval; 2199 { 2200 struct sys_fdatasync_args /* { 2201 syscallarg(int) fd; 2202 } */ *uap = v; 2203 struct vnode *vp; 2204 struct file *fp; 2205 int error; 2206 2207 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2208 return (error); 2209 vp = (struct vnode *)fp->f_data; 2210 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2211 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2212 VOP_UNLOCK(vp, 0); 2213 return (error); 2214 } 2215 2216 /* 2217 * Rename files, (standard) BSD semantics frontend. 2218 */ 2219 /* ARGSUSED */ 2220 int 2221 sys_rename(p, v, retval) 2222 struct proc *p; 2223 void *v; 2224 register_t *retval; 2225 { 2226 register struct sys_rename_args /* { 2227 syscallarg(const char *) from; 2228 syscallarg(const char *) to; 2229 } */ *uap = v; 2230 2231 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2232 } 2233 2234 /* 2235 * Rename files, POSIX semantics frontend. 2236 */ 2237 /* ARGSUSED */ 2238 int 2239 sys___posix_rename(p, v, retval) 2240 struct proc *p; 2241 void *v; 2242 register_t *retval; 2243 { 2244 register struct sys___posix_rename_args /* { 2245 syscallarg(const char *) from; 2246 syscallarg(const char *) to; 2247 } */ *uap = v; 2248 2249 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2250 } 2251 2252 /* 2253 * Rename files. Source and destination must either both be directories, 2254 * or both not be directories. If target is a directory, it must be empty. 2255 * If `from' and `to' refer to the same object, the value of the `retain' 2256 * argument is used to determine whether `from' will be 2257 * 2258 * (retain == 0) deleted unless `from' and `to' refer to the same 2259 * object in the file system's name space (BSD). 2260 * (retain == 1) always retained (POSIX). 2261 */ 2262 static int 2263 rename_files(from, to, p, retain) 2264 const char *from, *to; 2265 struct proc *p; 2266 int retain; 2267 { 2268 register struct vnode *tvp, *fvp, *tdvp; 2269 struct nameidata fromnd, tond; 2270 int error; 2271 2272 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2273 from, p); 2274 if ((error = namei(&fromnd)) != 0) 2275 return (error); 2276 fvp = fromnd.ni_vp; 2277 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2278 UIO_USERSPACE, to, p); 2279 if ((error = namei(&tond)) != 0) { 2280 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2281 vrele(fromnd.ni_dvp); 2282 vrele(fvp); 2283 goto out1; 2284 } 2285 tdvp = tond.ni_dvp; 2286 tvp = tond.ni_vp; 2287 2288 if (tvp != NULL) { 2289 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2290 error = ENOTDIR; 2291 goto out; 2292 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2293 error = EISDIR; 2294 goto out; 2295 } 2296 } 2297 2298 if (fvp == tdvp) 2299 error = EINVAL; 2300 2301 /* 2302 * Source and destination refer to the same object. 2303 */ 2304 if (fvp == tvp) { 2305 if (retain) 2306 error = -1; 2307 else if (fromnd.ni_dvp == tdvp && 2308 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2309 !memcmp(fromnd.ni_cnd.cn_nameptr, 2310 tond.ni_cnd.cn_nameptr, 2311 fromnd.ni_cnd.cn_namelen)) 2312 error = -1; 2313 } 2314 2315 out: 2316 if (!error) { 2317 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2318 if (fromnd.ni_dvp != tdvp) 2319 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2320 if (tvp) { 2321 #if defined(UVM) 2322 (void)uvm_vnp_uncache(tvp); 2323 #else 2324 (void)vnode_pager_uncache(tvp); 2325 #endif 2326 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2327 } 2328 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2329 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2330 } else { 2331 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2332 if (tdvp == tvp) 2333 vrele(tdvp); 2334 else 2335 vput(tdvp); 2336 if (tvp) 2337 vput(tvp); 2338 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2339 vrele(fromnd.ni_dvp); 2340 vrele(fvp); 2341 } 2342 vrele(tond.ni_startdir); 2343 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2344 out1: 2345 if (fromnd.ni_startdir) 2346 vrele(fromnd.ni_startdir); 2347 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2348 return (error == -1 ? 0 : error); 2349 } 2350 2351 /* 2352 * Make a directory file. 2353 */ 2354 /* ARGSUSED */ 2355 int 2356 sys_mkdir(p, v, retval) 2357 struct proc *p; 2358 void *v; 2359 register_t *retval; 2360 { 2361 register struct sys_mkdir_args /* { 2362 syscallarg(const char *) path; 2363 syscallarg(int) mode; 2364 } */ *uap = v; 2365 register struct vnode *vp; 2366 struct vattr vattr; 2367 int error; 2368 struct nameidata nd; 2369 2370 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2371 if ((error = namei(&nd)) != 0) 2372 return (error); 2373 vp = nd.ni_vp; 2374 if (vp != NULL) { 2375 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2376 if (nd.ni_dvp == vp) 2377 vrele(nd.ni_dvp); 2378 else 2379 vput(nd.ni_dvp); 2380 vrele(vp); 2381 return (EEXIST); 2382 } 2383 VATTR_NULL(&vattr); 2384 vattr.va_type = VDIR; 2385 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 2386 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2387 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2388 if (!error) 2389 vput(nd.ni_vp); 2390 return (error); 2391 } 2392 2393 /* 2394 * Remove a directory file. 2395 */ 2396 /* ARGSUSED */ 2397 int 2398 sys_rmdir(p, v, retval) 2399 struct proc *p; 2400 void *v; 2401 register_t *retval; 2402 { 2403 struct sys_rmdir_args /* { 2404 syscallarg(const char *) path; 2405 } */ *uap = v; 2406 register struct vnode *vp; 2407 int error; 2408 struct nameidata nd; 2409 2410 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2411 SCARG(uap, path), p); 2412 if ((error = namei(&nd)) != 0) 2413 return (error); 2414 vp = nd.ni_vp; 2415 if (vp->v_type != VDIR) { 2416 error = ENOTDIR; 2417 goto out; 2418 } 2419 /* 2420 * No rmdir "." please. 2421 */ 2422 if (nd.ni_dvp == vp) { 2423 error = EINVAL; 2424 goto out; 2425 } 2426 /* 2427 * The root of a mounted filesystem cannot be deleted. 2428 */ 2429 if (vp->v_flag & VROOT) 2430 error = EBUSY; 2431 out: 2432 if (!error) { 2433 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2434 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2435 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2436 } else { 2437 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2438 if (nd.ni_dvp == vp) 2439 vrele(nd.ni_dvp); 2440 else 2441 vput(nd.ni_dvp); 2442 vput(vp); 2443 } 2444 return (error); 2445 } 2446 2447 /* 2448 * Read a block of directory entries in a file system independent format. 2449 */ 2450 int 2451 sys_getdents(p, v, retval) 2452 struct proc *p; 2453 void *v; 2454 register_t *retval; 2455 { 2456 register struct sys_getdents_args /* { 2457 syscallarg(int) fd; 2458 syscallarg(char *) buf; 2459 syscallarg(size_t) count; 2460 } */ *uap = v; 2461 struct file *fp; 2462 int error, done; 2463 2464 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2465 return (error); 2466 if ((fp->f_flag & FREAD) == 0) 2467 return (EBADF); 2468 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2469 SCARG(uap, count), &done, p, 0, 0); 2470 *retval = done; 2471 return (error); 2472 } 2473 2474 /* 2475 * Set the mode mask for creation of filesystem nodes. 2476 */ 2477 int 2478 sys_umask(p, v, retval) 2479 struct proc *p; 2480 void *v; 2481 register_t *retval; 2482 { 2483 struct sys_umask_args /* { 2484 syscallarg(mode_t) newmask; 2485 } */ *uap = v; 2486 register struct filedesc *fdp; 2487 2488 fdp = p->p_fd; 2489 *retval = fdp->fd_cmask; 2490 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2491 return (0); 2492 } 2493 2494 /* 2495 * Void all references to file by ripping underlying filesystem 2496 * away from vnode. 2497 */ 2498 /* ARGSUSED */ 2499 int 2500 sys_revoke(p, v, retval) 2501 struct proc *p; 2502 void *v; 2503 register_t *retval; 2504 { 2505 register struct sys_revoke_args /* { 2506 syscallarg(const char *) path; 2507 } */ *uap = v; 2508 register struct vnode *vp; 2509 struct vattr vattr; 2510 int error; 2511 struct nameidata nd; 2512 2513 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2514 if ((error = namei(&nd)) != 0) 2515 return (error); 2516 vp = nd.ni_vp; 2517 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2518 goto out; 2519 if (p->p_ucred->cr_uid != vattr.va_uid && 2520 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2521 goto out; 2522 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2523 VOP_REVOKE(vp, REVOKEALL); 2524 out: 2525 vrele(vp); 2526 return (error); 2527 } 2528 2529 /* 2530 * Convert a user file descriptor to a kernel file entry. 2531 */ 2532 int 2533 getvnode(fdp, fd, fpp) 2534 struct filedesc *fdp; 2535 int fd; 2536 struct file **fpp; 2537 { 2538 struct vnode *vp; 2539 struct file *fp; 2540 2541 if ((u_int)fd >= fdp->fd_nfiles || 2542 (fp = fdp->fd_ofiles[fd]) == NULL) 2543 return (EBADF); 2544 if (fp->f_type != DTYPE_VNODE) 2545 return (EINVAL); 2546 vp = (struct vnode *)fp->f_data; 2547 if (vp->v_type == VBAD) 2548 return (EBADF); 2549 *fpp = fp; 2550 return (0); 2551 } 2552
Indexes created Thu Sep 25 16:09:42 GMT 2025