vfs_syscalls.c revision 1.122
1 /* $NetBSD: vfs_syscalls.c,v 1.122 1998/07/31 22:50:54 perry 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 #if defined(COMPAT_09) || defined(COMPAT_43) || defined(COMPAT_44) 89 /* 90 * This table is used to maintain compatibility with 4.3BSD 91 * and NetBSD 0.9 mount syscalls. Note, the order is important! 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 }; 113 const int nmountcompatnames = sizeof(mountcompatnames) / 114 sizeof(mountcompatnames[0]); 115 #endif /* COMPAT_09 || COMPAT_43 */ 116 117 /* ARGSUSED */ 118 int 119 sys_mount(p, v, retval) 120 struct proc *p; 121 void *v; 122 register_t *retval; 123 { 124 register struct sys_mount_args /* { 125 syscallarg(const char *) type; 126 syscallarg(const char *) path; 127 syscallarg(int) flags; 128 syscallarg(void *) data; 129 } */ *uap = v; 130 struct vnode *vp; 131 struct mount *mp; 132 int error, flag = 0; 133 char fstypename[MFSNAMELEN]; 134 struct vattr va; 135 struct nameidata nd; 136 struct vfsops *vfs; 137 138 /* 139 * Get vnode to be covered 140 */ 141 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 142 SCARG(uap, path), p); 143 if ((error = namei(&nd)) != 0) 144 return (error); 145 vp = nd.ni_vp; 146 /* 147 * A lookup in VFS_MOUNT might result in an attempt to 148 * lock this vnode again, so make the lock resursive. 149 */ 150 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_CANRECURSE); 151 if (SCARG(uap, flags) & MNT_UPDATE) { 152 if ((vp->v_flag & VROOT) == 0) { 153 vput(vp); 154 return (EINVAL); 155 } 156 mp = vp->v_mount; 157 flag = mp->mnt_flag; 158 vfs = mp->mnt_op; 159 /* 160 * We only allow the filesystem to be reloaded if it 161 * is currently mounted read-only. 162 */ 163 if ((SCARG(uap, flags) & MNT_RELOAD) && 164 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 165 vput(vp); 166 return (EOPNOTSUPP); /* Needs translation */ 167 } 168 mp->mnt_flag |= 169 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 170 /* 171 * Only root, or the user that did the original mount is 172 * permitted to update it. 173 */ 174 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 175 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 176 vput(vp); 177 return (error); 178 } 179 /* 180 * Do not allow NFS export by non-root users. Silently 181 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 182 */ 183 if (p->p_ucred->cr_uid != 0) { 184 if (SCARG(uap, flags) & MNT_EXPORTED) { 185 vput(vp); 186 return (EPERM); 187 } 188 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 189 } 190 if (vfs_busy(mp, LK_NOWAIT, 0)) { 191 vput(vp); 192 return (EPERM); 193 } 194 VOP_UNLOCK(vp, 0); 195 goto update; 196 } 197 /* 198 * If the user is not root, ensure that they own the directory 199 * onto which we are attempting to mount. 200 */ 201 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 202 (va.va_uid != p->p_ucred->cr_uid && 203 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 204 vput(vp); 205 return (error); 206 } 207 /* 208 * Do not allow NFS export by non-root users. Silently 209 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 210 */ 211 if (p->p_ucred->cr_uid != 0) { 212 if (SCARG(uap, flags) & MNT_EXPORTED) { 213 vput(vp); 214 return (EPERM); 215 } 216 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 217 } 218 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 219 return (error); 220 if (vp->v_type != VDIR) { 221 vput(vp); 222 return (ENOTDIR); 223 } 224 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 225 if (error) { 226 #if defined(COMPAT_09) || defined(COMPAT_43) 227 /* 228 * Historically filesystem types were identified by number. 229 * If we get an integer for the filesystem type instead of a 230 * string, we check to see if it matches one of the historic 231 * filesystem types. 232 */ 233 u_long fsindex = (u_long)SCARG(uap, type); 234 if (fsindex >= nmountcompatnames || 235 mountcompatnames[fsindex] == NULL) { 236 vput(vp); 237 return (ENODEV); 238 } 239 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 240 #else 241 vput(vp); 242 return (error); 243 #endif 244 } 245 #ifdef COMPAT_10 246 /* Accept `ufs' as an alias for `ffs'. */ 247 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 248 strncpy(fstypename, "ffs", MFSNAMELEN); 249 #endif 250 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 251 vput(vp); 252 return (ENODEV); 253 } 254 if (vp->v_mountedhere != NULL) { 255 vput(vp); 256 return (EBUSY); 257 } 258 259 /* 260 * Allocate and initialize the file system. 261 */ 262 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 263 M_MOUNT, M_WAITOK); 264 bzero((char *)mp, (u_long)sizeof(struct mount)); 265 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 266 (void)vfs_busy(mp, LK_NOWAIT, 0); 267 mp->mnt_op = vfs; 268 vfs->vfs_refcount++; 269 vp->v_mountedhere = mp; 270 mp->mnt_vnodecovered = vp; 271 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 272 update: 273 /* 274 * Set the mount level flags. 275 */ 276 if (SCARG(uap, flags) & MNT_RDONLY) 277 mp->mnt_flag |= MNT_RDONLY; 278 else if (mp->mnt_flag & MNT_RDONLY) 279 mp->mnt_flag |= MNT_WANTRDWR; 280 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 281 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 282 MNT_NOATIME | MNT_SYMPERM); 283 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 284 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 285 MNT_NOCOREDUMP | MNT_NOATIME | MNT_SYMPERM); 286 /* 287 * Mount the filesystem. 288 */ 289 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 290 if (mp->mnt_flag & MNT_UPDATE) { 291 vrele(vp); 292 if (mp->mnt_flag & MNT_WANTRDWR) 293 mp->mnt_flag &= ~MNT_RDONLY; 294 mp->mnt_flag &=~ 295 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 296 if (error) 297 mp->mnt_flag = flag; 298 vfs_unbusy(mp); 299 return (error); 300 } 301 /* 302 * Put the new filesystem on the mount list after root. 303 */ 304 cache_purge(vp); 305 if (!error) { 306 simple_lock(&mountlist_slock); 307 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 308 simple_unlock(&mountlist_slock); 309 checkdirs(vp); 310 VOP_UNLOCK(vp, 0); 311 vfs_unbusy(mp); 312 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 313 if ((error = VFS_START(mp, 0, p))) 314 vrele(vp); 315 } else { 316 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 317 vfs->vfs_refcount--; 318 vfs_unbusy(mp); 319 free((caddr_t)mp, M_MOUNT); 320 vput(vp); 321 } 322 return (error); 323 } 324 325 /* 326 * Scan all active processes to see if any of them have a current 327 * or root directory onto which the new filesystem has just been 328 * mounted. If so, replace them with the new mount point. 329 */ 330 void 331 checkdirs(olddp) 332 struct vnode *olddp; 333 { 334 struct filedesc *fdp; 335 struct vnode *newdp; 336 struct proc *p; 337 338 if (olddp->v_usecount == 1) 339 return; 340 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 341 panic("mount: lost mount"); 342 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 343 fdp = p->p_fd; 344 if (fdp->fd_cdir == olddp) { 345 vrele(fdp->fd_cdir); 346 VREF(newdp); 347 fdp->fd_cdir = newdp; 348 } 349 if (fdp->fd_rdir == olddp) { 350 vrele(fdp->fd_rdir); 351 VREF(newdp); 352 fdp->fd_rdir = newdp; 353 } 354 } 355 if (rootvnode == olddp) { 356 vrele(rootvnode); 357 VREF(newdp); 358 rootvnode = newdp; 359 } 360 vput(newdp); 361 } 362 363 /* 364 * Unmount a file system. 365 * 366 * Note: unmount takes a path to the vnode mounted on as argument, 367 * not special file (as before). 368 */ 369 /* ARGSUSED */ 370 int 371 sys_unmount(p, v, retval) 372 struct proc *p; 373 void *v; 374 register_t *retval; 375 { 376 register struct sys_unmount_args /* { 377 syscallarg(const char *) path; 378 syscallarg(int) flags; 379 } */ *uap = v; 380 register struct vnode *vp; 381 struct mount *mp; 382 int error; 383 struct nameidata nd; 384 385 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 386 SCARG(uap, path), p); 387 if ((error = namei(&nd)) != 0) 388 return (error); 389 vp = nd.ni_vp; 390 mp = vp->v_mount; 391 392 /* 393 * Only root, or the user that did the original mount is 394 * permitted to unmount this filesystem. 395 */ 396 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 397 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 398 vput(vp); 399 return (error); 400 } 401 402 /* 403 * Don't allow unmounting the root file system. 404 */ 405 if (mp->mnt_flag & MNT_ROOTFS) { 406 vput(vp); 407 return (EINVAL); 408 } 409 410 /* 411 * Must be the root of the filesystem 412 */ 413 if ((vp->v_flag & VROOT) == 0) { 414 vput(vp); 415 return (EINVAL); 416 } 417 vput(vp); 418 419 if (vfs_busy(mp, 0, 0)) 420 return (EBUSY); 421 422 return (dounmount(mp, SCARG(uap, flags), p)); 423 } 424 425 /* 426 * Do the actual file system unmount. File system is assumed to have been 427 * marked busy by the caller. 428 */ 429 int 430 dounmount(mp, flags, p) 431 register struct mount *mp; 432 int flags; 433 struct proc *p; 434 { 435 struct vnode *coveredvp; 436 int error; 437 438 simple_lock(&mountlist_slock); 439 mp->mnt_flag |= MNT_UNMOUNT; 440 vfs_unbusy(mp); 441 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 442 if (mp->mnt_flag & MNT_EXPUBLIC) 443 vfs_setpublicfs(NULL, NULL, NULL); 444 mp->mnt_flag &=~ MNT_ASYNC; 445 #if !defined(UVM) 446 vnode_pager_umount(mp); /* release cached vnodes */ 447 #endif 448 cache_purgevfs(mp); /* remove cache entries for this file sys */ 449 if (((mp->mnt_flag & MNT_RDONLY) || 450 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 451 (flags & MNT_FORCE)) 452 error = VFS_UNMOUNT(mp, flags, p); 453 simple_lock(&mountlist_slock); 454 if (error) { 455 mp->mnt_flag &= ~MNT_UNMOUNT; 456 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 457 &mountlist_slock); 458 if (mp->mnt_flag & MNT_MWAIT) 459 wakeup((caddr_t)mp); 460 return (error); 461 } 462 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 463 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 464 coveredvp->v_mountedhere = NULL; 465 vrele(coveredvp); 466 } 467 mp->mnt_op->vfs_refcount--; 468 if (mp->mnt_vnodelist.lh_first != NULL) 469 panic("unmount: dangling vnode"); 470 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 471 if (mp->mnt_flag & MNT_MWAIT) 472 wakeup((caddr_t)mp); 473 free((caddr_t)mp, M_MOUNT); 474 return (0); 475 } 476 477 /* 478 * Sync each mounted filesystem. 479 */ 480 #ifdef DEBUG 481 int syncprt = 0; 482 struct ctldebug debug0 = { "syncprt", &syncprt }; 483 #endif 484 485 /* ARGSUSED */ 486 int 487 sys_sync(p, v, retval) 488 struct proc *p; 489 void *v; 490 register_t *retval; 491 { 492 register struct mount *mp, *nmp; 493 int asyncflag; 494 495 simple_lock(&mountlist_slock); 496 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 497 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 498 nmp = mp->mnt_list.cqe_prev; 499 continue; 500 } 501 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 502 asyncflag = mp->mnt_flag & MNT_ASYNC; 503 mp->mnt_flag &= ~MNT_ASYNC; 504 #if defined(UVM) 505 uvm_vnp_sync(mp); 506 #else 507 vnode_pager_sync(mp); 508 #endif 509 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 510 if (asyncflag) 511 mp->mnt_flag |= MNT_ASYNC; 512 } 513 simple_lock(&mountlist_slock); 514 nmp = mp->mnt_list.cqe_prev; 515 vfs_unbusy(mp); 516 517 } 518 simple_unlock(&mountlist_slock); 519 #ifdef DEBUG 520 if (syncprt) 521 vfs_bufstats(); 522 #endif /* DEBUG */ 523 return (0); 524 } 525 526 /* 527 * Change filesystem quotas. 528 */ 529 /* ARGSUSED */ 530 int 531 sys_quotactl(p, v, retval) 532 struct proc *p; 533 void *v; 534 register_t *retval; 535 { 536 register struct sys_quotactl_args /* { 537 syscallarg(const char *) path; 538 syscallarg(int) cmd; 539 syscallarg(int) uid; 540 syscallarg(caddr_t) arg; 541 } */ *uap = v; 542 register struct mount *mp; 543 int error; 544 struct nameidata nd; 545 546 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 547 if ((error = namei(&nd)) != 0) 548 return (error); 549 mp = nd.ni_vp->v_mount; 550 vrele(nd.ni_vp); 551 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 552 SCARG(uap, arg), p)); 553 } 554 555 /* 556 * Get filesystem statistics. 557 */ 558 /* ARGSUSED */ 559 int 560 sys_statfs(p, v, retval) 561 struct proc *p; 562 void *v; 563 register_t *retval; 564 { 565 register struct sys_statfs_args /* { 566 syscallarg(const char *) path; 567 syscallarg(struct statfs *) buf; 568 } */ *uap = v; 569 register struct mount *mp; 570 register struct statfs *sp; 571 int error; 572 struct nameidata nd; 573 574 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 575 if ((error = namei(&nd)) != 0) 576 return (error); 577 mp = nd.ni_vp->v_mount; 578 sp = &mp->mnt_stat; 579 vrele(nd.ni_vp); 580 if ((error = VFS_STATFS(mp, sp, p)) != 0) 581 return (error); 582 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 583 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 584 } 585 586 /* 587 * Get filesystem statistics. 588 */ 589 /* ARGSUSED */ 590 int 591 sys_fstatfs(p, v, retval) 592 struct proc *p; 593 void *v; 594 register_t *retval; 595 { 596 register struct sys_fstatfs_args /* { 597 syscallarg(int) fd; 598 syscallarg(struct statfs *) buf; 599 } */ *uap = v; 600 struct file *fp; 601 struct mount *mp; 602 register struct statfs *sp; 603 int error; 604 605 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 606 return (error); 607 mp = ((struct vnode *)fp->f_data)->v_mount; 608 sp = &mp->mnt_stat; 609 if ((error = VFS_STATFS(mp, sp, p)) != 0) 610 return (error); 611 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 612 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 613 } 614 615 /* 616 * Get statistics on all filesystems. 617 */ 618 int 619 sys_getfsstat(p, v, retval) 620 struct proc *p; 621 void *v; 622 register_t *retval; 623 { 624 register struct sys_getfsstat_args /* { 625 syscallarg(struct statfs *) buf; 626 syscallarg(long) bufsize; 627 syscallarg(int) flags; 628 } */ *uap = v; 629 register struct mount *mp, *nmp; 630 register struct statfs *sp; 631 caddr_t sfsp; 632 long count, maxcount, error; 633 634 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 635 sfsp = (caddr_t)SCARG(uap, buf); 636 simple_lock(&mountlist_slock); 637 count = 0; 638 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 639 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 640 nmp = mp->mnt_list.cqe_next; 641 continue; 642 } 643 if (sfsp && count < maxcount) { 644 sp = &mp->mnt_stat; 645 /* 646 * If MNT_NOWAIT is specified, do not refresh the 647 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 648 */ 649 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 650 (SCARG(uap, flags) & MNT_WAIT)) && 651 (error = VFS_STATFS(mp, sp, p)) != 0) { 652 simple_lock(&mountlist_slock); 653 nmp = mp->mnt_list.cqe_next; 654 vfs_unbusy(mp); 655 continue; 656 } 657 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 658 error = copyout(sp, sfsp, sizeof(*sp)); 659 if (error) 660 return (error); 661 sfsp += sizeof(*sp); 662 } 663 count++; 664 simple_lock(&mountlist_slock); 665 nmp = mp->mnt_list.cqe_next; 666 vfs_unbusy(mp); 667 } 668 simple_unlock(&mountlist_slock); 669 if (sfsp && count > maxcount) 670 *retval = maxcount; 671 else 672 *retval = count; 673 return (0); 674 } 675 676 /* 677 * Change current working directory to a given file descriptor. 678 */ 679 /* ARGSUSED */ 680 int 681 sys_fchdir(p, v, retval) 682 struct proc *p; 683 void *v; 684 register_t *retval; 685 { 686 struct sys_fchdir_args /* { 687 syscallarg(int) fd; 688 } */ *uap = v; 689 register struct filedesc *fdp = p->p_fd; 690 struct vnode *vp, *tdp; 691 struct mount *mp; 692 struct file *fp; 693 int error; 694 695 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 696 return (error); 697 vp = (struct vnode *)fp->f_data; 698 VREF(vp); 699 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 700 if (vp->v_type != VDIR) 701 error = ENOTDIR; 702 else 703 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 704 while (!error && (mp = vp->v_mountedhere) != NULL) { 705 if (vfs_busy(mp, 0, 0)) 706 continue; 707 error = VFS_ROOT(mp, &tdp); 708 vfs_unbusy(mp); 709 if (error) 710 break; 711 vput(vp); 712 vp = tdp; 713 } 714 if (error) { 715 vput(vp); 716 return (error); 717 } 718 VOP_UNLOCK(vp, 0); 719 vrele(fdp->fd_cdir); 720 fdp->fd_cdir = vp; 721 return (0); 722 } 723 724 /* 725 * Change current working directory (``.''). 726 */ 727 /* ARGSUSED */ 728 int 729 sys_chdir(p, v, retval) 730 struct proc *p; 731 void *v; 732 register_t *retval; 733 { 734 struct sys_chdir_args /* { 735 syscallarg(const char *) path; 736 } */ *uap = v; 737 register struct filedesc *fdp = p->p_fd; 738 int error; 739 struct nameidata nd; 740 741 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 742 SCARG(uap, path), p); 743 if ((error = change_dir(&nd, p)) != 0) 744 return (error); 745 vrele(fdp->fd_cdir); 746 fdp->fd_cdir = nd.ni_vp; 747 return (0); 748 } 749 750 /* 751 * Change notion of root (``/'') directory. 752 */ 753 /* ARGSUSED */ 754 int 755 sys_chroot(p, v, retval) 756 struct proc *p; 757 void *v; 758 register_t *retval; 759 { 760 struct sys_chroot_args /* { 761 syscallarg(const char *) path; 762 } */ *uap = v; 763 register struct filedesc *fdp = p->p_fd; 764 int error; 765 struct nameidata nd; 766 767 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 768 return (error); 769 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 770 SCARG(uap, path), p); 771 if ((error = change_dir(&nd, p)) != 0) 772 return (error); 773 if (fdp->fd_rdir != NULL) 774 vrele(fdp->fd_rdir); 775 fdp->fd_rdir = nd.ni_vp; 776 return (0); 777 } 778 779 /* 780 * Common routine for chroot and chdir. 781 */ 782 static int 783 change_dir(ndp, p) 784 register struct nameidata *ndp; 785 struct proc *p; 786 { 787 struct vnode *vp; 788 int error; 789 790 if ((error = namei(ndp)) != 0) 791 return (error); 792 vp = ndp->ni_vp; 793 if (vp->v_type != VDIR) 794 error = ENOTDIR; 795 else 796 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 797 798 if (error) 799 vput(vp); 800 else 801 VOP_UNLOCK(vp, 0); 802 return (error); 803 } 804 805 /* 806 * Check permissions, allocate an open file structure, 807 * and call the device open routine if any. 808 */ 809 int 810 sys_open(p, v, retval) 811 struct proc *p; 812 void *v; 813 register_t *retval; 814 { 815 register struct sys_open_args /* { 816 syscallarg(const char *) path; 817 syscallarg(int) flags; 818 syscallarg(int) mode; 819 } */ *uap = v; 820 register struct filedesc *fdp = p->p_fd; 821 register struct file *fp; 822 register struct vnode *vp; 823 int flags, cmode; 824 struct file *nfp; 825 int type, indx, error; 826 struct flock lf; 827 struct nameidata nd; 828 extern struct fileops vnops; 829 830 flags = FFLAGS(SCARG(uap, flags)); 831 if ((flags & (FREAD | FWRITE)) == 0) 832 return (EINVAL); 833 if ((error = falloc(p, &nfp, &indx)) != 0) 834 return (error); 835 fp = nfp; 836 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 837 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 838 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 839 if ((error = vn_open(&nd, flags, cmode)) != 0) { 840 ffree(fp); 841 if ((error == ENODEV || error == ENXIO) && 842 p->p_dupfd >= 0 && /* XXX from fdopen */ 843 (error = 844 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 845 *retval = indx; 846 return (0); 847 } 848 if (error == ERESTART) 849 error = EINTR; 850 fdp->fd_ofiles[indx] = NULL; 851 return (error); 852 } 853 p->p_dupfd = 0; 854 vp = nd.ni_vp; 855 fp->f_flag = flags & FMASK; 856 fp->f_type = DTYPE_VNODE; 857 fp->f_ops = &vnops; 858 fp->f_data = (caddr_t)vp; 859 if (flags & (O_EXLOCK | O_SHLOCK)) { 860 lf.l_whence = SEEK_SET; 861 lf.l_start = 0; 862 lf.l_len = 0; 863 if (flags & O_EXLOCK) 864 lf.l_type = F_WRLCK; 865 else 866 lf.l_type = F_RDLCK; 867 type = F_FLOCK; 868 if ((flags & FNONBLOCK) == 0) 869 type |= F_WAIT; 870 VOP_UNLOCK(vp, 0); 871 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 872 if (error) { 873 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 874 ffree(fp); 875 fdp->fd_ofiles[indx] = NULL; 876 return (error); 877 } 878 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 879 fp->f_flag |= FHASLOCK; 880 } 881 VOP_UNLOCK(vp, 0); 882 *retval = indx; 883 return (0); 884 } 885 886 /* 887 * Create a special file. 888 */ 889 /* ARGSUSED */ 890 int 891 sys_mknod(p, v, retval) 892 struct proc *p; 893 void *v; 894 register_t *retval; 895 { 896 register struct sys_mknod_args /* { 897 syscallarg(const char *) path; 898 syscallarg(int) mode; 899 syscallarg(int) dev; 900 } */ *uap = v; 901 register struct vnode *vp; 902 struct vattr vattr; 903 int error; 904 int whiteout = 0; 905 struct nameidata nd; 906 907 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 908 return (error); 909 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 910 if ((error = namei(&nd)) != 0) 911 return (error); 912 vp = nd.ni_vp; 913 if (vp != NULL) 914 error = EEXIST; 915 else { 916 VATTR_NULL(&vattr); 917 vattr.va_mode = 918 (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 919 vattr.va_rdev = SCARG(uap, dev); 920 whiteout = 0; 921 922 switch (SCARG(uap, mode) & S_IFMT) { 923 case S_IFMT: /* used by badsect to flag bad sectors */ 924 vattr.va_type = VBAD; 925 break; 926 case S_IFCHR: 927 vattr.va_type = VCHR; 928 break; 929 case S_IFBLK: 930 vattr.va_type = VBLK; 931 break; 932 case S_IFWHT: 933 whiteout = 1; 934 break; 935 default: 936 error = EINVAL; 937 break; 938 } 939 } 940 if (!error) { 941 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 942 if (whiteout) { 943 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 944 if (error) 945 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 946 vput(nd.ni_dvp); 947 } else { 948 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 949 &nd.ni_cnd, &vattr); 950 } 951 } else { 952 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 953 if (nd.ni_dvp == vp) 954 vrele(nd.ni_dvp); 955 else 956 vput(nd.ni_dvp); 957 if (vp) 958 vrele(vp); 959 } 960 return (error); 961 } 962 963 /* 964 * Create a named pipe. 965 */ 966 /* ARGSUSED */ 967 int 968 sys_mkfifo(p, v, retval) 969 struct proc *p; 970 void *v; 971 register_t *retval; 972 { 973 register struct sys_mkfifo_args /* { 974 syscallarg(const char *) path; 975 syscallarg(int) mode; 976 } */ *uap = v; 977 struct vattr vattr; 978 int error; 979 struct nameidata nd; 980 981 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 982 if ((error = namei(&nd)) != 0) 983 return (error); 984 if (nd.ni_vp != NULL) { 985 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 986 if (nd.ni_dvp == nd.ni_vp) 987 vrele(nd.ni_dvp); 988 else 989 vput(nd.ni_dvp); 990 vrele(nd.ni_vp); 991 return (EEXIST); 992 } 993 VATTR_NULL(&vattr); 994 vattr.va_type = VFIFO; 995 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 996 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 997 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 998 } 999 1000 /* 1001 * Make a hard file link. 1002 */ 1003 /* ARGSUSED */ 1004 int 1005 sys_link(p, v, retval) 1006 struct proc *p; 1007 void *v; 1008 register_t *retval; 1009 { 1010 register struct sys_link_args /* { 1011 syscallarg(const char *) path; 1012 syscallarg(const char *) link; 1013 } */ *uap = v; 1014 register struct vnode *vp; 1015 struct nameidata nd; 1016 int error; 1017 1018 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1019 if ((error = namei(&nd)) != 0) 1020 return (error); 1021 vp = nd.ni_vp; 1022 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1023 if ((error = namei(&nd)) != 0) 1024 goto out; 1025 if (nd.ni_vp) { 1026 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1027 if (nd.ni_dvp == nd.ni_vp) 1028 vrele(nd.ni_dvp); 1029 else 1030 vput(nd.ni_dvp); 1031 vrele(nd.ni_vp); 1032 error = EEXIST; 1033 goto out; 1034 } 1035 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1036 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1037 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1038 out: 1039 vrele(vp); 1040 return (error); 1041 } 1042 1043 /* 1044 * Make a symbolic link. 1045 */ 1046 /* ARGSUSED */ 1047 int 1048 sys_symlink(p, v, retval) 1049 struct proc *p; 1050 void *v; 1051 register_t *retval; 1052 { 1053 register struct sys_symlink_args /* { 1054 syscallarg(const char *) path; 1055 syscallarg(const char *) link; 1056 } */ *uap = v; 1057 struct vattr vattr; 1058 char *path; 1059 int error; 1060 struct nameidata nd; 1061 1062 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1063 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1064 if (error) 1065 goto out; 1066 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1067 if ((error = namei(&nd)) != 0) 1068 goto out; 1069 if (nd.ni_vp) { 1070 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1071 if (nd.ni_dvp == nd.ni_vp) 1072 vrele(nd.ni_dvp); 1073 else 1074 vput(nd.ni_dvp); 1075 vrele(nd.ni_vp); 1076 error = EEXIST; 1077 goto out; 1078 } 1079 VATTR_NULL(&vattr); 1080 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1081 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1082 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1083 out: 1084 FREE(path, M_NAMEI); 1085 return (error); 1086 } 1087 1088 /* 1089 * Delete a whiteout from the filesystem. 1090 */ 1091 /* ARGSUSED */ 1092 int 1093 sys_undelete(p, v, retval) 1094 struct proc *p; 1095 void *v; 1096 register_t *retval; 1097 { 1098 register struct sys_undelete_args /* { 1099 syscallarg(const char *) path; 1100 } */ *uap = v; 1101 int error; 1102 struct nameidata nd; 1103 1104 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1105 SCARG(uap, path), p); 1106 error = namei(&nd); 1107 if (error) 1108 return (error); 1109 1110 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1111 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1112 if (nd.ni_dvp == nd.ni_vp) 1113 vrele(nd.ni_dvp); 1114 else 1115 vput(nd.ni_dvp); 1116 if (nd.ni_vp) 1117 vrele(nd.ni_vp); 1118 return (EEXIST); 1119 } 1120 1121 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1122 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1123 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1124 vput(nd.ni_dvp); 1125 return (error); 1126 } 1127 1128 /* 1129 * Delete a name from the filesystem. 1130 */ 1131 /* ARGSUSED */ 1132 int 1133 sys_unlink(p, v, retval) 1134 struct proc *p; 1135 void *v; 1136 register_t *retval; 1137 { 1138 struct sys_unlink_args /* { 1139 syscallarg(const char *) path; 1140 } */ *uap = v; 1141 register struct vnode *vp; 1142 int error; 1143 struct nameidata nd; 1144 1145 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1146 SCARG(uap, path), p); 1147 if ((error = namei(&nd)) != 0) 1148 return (error); 1149 vp = nd.ni_vp; 1150 1151 /* 1152 * The root of a mounted filesystem cannot be deleted. 1153 */ 1154 if (vp->v_flag & VROOT) { 1155 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1156 if (nd.ni_dvp == vp) 1157 vrele(nd.ni_dvp); 1158 else 1159 vput(nd.ni_dvp); 1160 vput(vp); 1161 error = EBUSY; 1162 goto out; 1163 } 1164 1165 #if defined(UVM) 1166 (void)uvm_vnp_uncache(vp); 1167 #else 1168 (void)vnode_pager_uncache(vp); 1169 #endif 1170 1171 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1172 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1173 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1174 out: 1175 return (error); 1176 } 1177 1178 /* 1179 * Reposition read/write file offset. 1180 */ 1181 int 1182 sys_lseek(p, v, retval) 1183 struct proc *p; 1184 void *v; 1185 register_t *retval; 1186 { 1187 register struct sys_lseek_args /* { 1188 syscallarg(int) fd; 1189 syscallarg(int) pad; 1190 syscallarg(off_t) offset; 1191 syscallarg(int) whence; 1192 } */ *uap = v; 1193 struct ucred *cred = p->p_ucred; 1194 register struct filedesc *fdp = p->p_fd; 1195 register struct file *fp; 1196 struct vnode *vp; 1197 struct vattr vattr; 1198 register off_t newoff; 1199 int error; 1200 1201 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1202 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1203 return (EBADF); 1204 1205 vp = (struct vnode *)fp->f_data; 1206 if (fp->f_type != DTYPE_VNODE 1207 || vp->v_type == VFIFO) 1208 return (ESPIPE); 1209 1210 switch (SCARG(uap, whence)) { 1211 case SEEK_CUR: 1212 newoff = fp->f_offset + SCARG(uap, offset); 1213 break; 1214 case SEEK_END: 1215 error = VOP_GETATTR(vp, &vattr, cred, p); 1216 if (error) 1217 return (error); 1218 newoff = SCARG(uap, offset) + vattr.va_size; 1219 break; 1220 case SEEK_SET: 1221 newoff = SCARG(uap, offset); 1222 break; 1223 default: 1224 return (EINVAL); 1225 } 1226 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1227 return (error); 1228 1229 *(off_t *)retval = fp->f_offset = newoff; 1230 return (0); 1231 } 1232 1233 /* 1234 * Positional read system call. 1235 */ 1236 int 1237 sys_pread(p, v, retval) 1238 struct proc *p; 1239 void *v; 1240 register_t *retval; 1241 { 1242 struct sys_pread_args /* { 1243 syscallarg(int) fd; 1244 syscallarg(void *) buf; 1245 syscallarg(size_t) nbyte; 1246 syscallarg(off_t) offset; 1247 } */ *uap = v; 1248 struct filedesc *fdp = p->p_fd; 1249 struct file *fp; 1250 struct vnode *vp; 1251 off_t offset; 1252 int error, fd = SCARG(uap, fd); 1253 1254 if ((u_int)fd >= fdp->fd_nfiles || 1255 (fp = fdp->fd_ofiles[fd]) == NULL || 1256 (fp->f_flag & FREAD) == 0) 1257 return (EBADF); 1258 1259 vp = (struct vnode *)fp->f_data; 1260 if (fp->f_type != DTYPE_VNODE 1261 || vp->v_type == VFIFO) 1262 return (ESPIPE); 1263 1264 offset = SCARG(uap, offset); 1265 1266 /* 1267 * XXX This works because no file systems actually 1268 * XXX take any action on the seek operation. 1269 */ 1270 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1271 return (error); 1272 1273 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1274 &offset, 0, retval)); 1275 } 1276 1277 /* 1278 * Positional scatter read system call. 1279 */ 1280 int 1281 sys_preadv(p, v, retval) 1282 struct proc *p; 1283 void *v; 1284 register_t *retval; 1285 { 1286 struct sys_preadv_args /* { 1287 syscallarg(int) fd; 1288 syscallarg(const struct iovec *) iovp; 1289 syscallarg(int) iovcnt; 1290 syscallarg(off_t) offset; 1291 } */ *uap = v; 1292 struct filedesc *fdp = p->p_fd; 1293 struct file *fp; 1294 struct vnode *vp; 1295 off_t offset; 1296 int error, fd = SCARG(uap, fd); 1297 1298 if ((u_int)fd >= fdp->fd_nfiles || 1299 (fp = fdp->fd_ofiles[fd]) == NULL || 1300 (fp->f_flag & FREAD) == 0) 1301 return (EBADF); 1302 1303 vp = (struct vnode *)fp->f_data; 1304 if (fp->f_type != DTYPE_VNODE 1305 || vp->v_type == VFIFO) 1306 return (ESPIPE); 1307 1308 offset = SCARG(uap, offset); 1309 1310 /* 1311 * XXX This works because no file systems actually 1312 * XXX take any action on the seek operation. 1313 */ 1314 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1315 return (error); 1316 1317 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1318 &offset, 0, retval)); 1319 } 1320 1321 /* 1322 * Positional write system call. 1323 */ 1324 int 1325 sys_pwrite(p, v, retval) 1326 struct proc *p; 1327 void *v; 1328 register_t *retval; 1329 { 1330 struct sys_pwrite_args /* { 1331 syscallarg(int) fd; 1332 syscallarg(const void *) buf; 1333 syscallarg(size_t) nbyte; 1334 syscallarg(off_t) offset; 1335 } */ *uap = v; 1336 struct filedesc *fdp = p->p_fd; 1337 struct file *fp; 1338 struct vnode *vp; 1339 off_t offset; 1340 int error, fd = SCARG(uap, fd); 1341 1342 if ((u_int)fd >= fdp->fd_nfiles || 1343 (fp = fdp->fd_ofiles[fd]) == NULL || 1344 (fp->f_flag & FWRITE) == 0) 1345 return (EBADF); 1346 1347 vp = (struct vnode *)fp->f_data; 1348 if (fp->f_type != DTYPE_VNODE 1349 || vp->v_type == VFIFO) 1350 return (ESPIPE); 1351 1352 offset = SCARG(uap, offset); 1353 1354 /* 1355 * XXX This works because no file systems actually 1356 * XXX take any action on the seek operation. 1357 */ 1358 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1359 return (error); 1360 1361 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1362 &offset, 0, retval)); 1363 } 1364 1365 /* 1366 * Positional gather write system call. 1367 */ 1368 int 1369 sys_pwritev(p, v, retval) 1370 struct proc *p; 1371 void *v; 1372 register_t *retval; 1373 { 1374 struct sys_pwritev_args /* { 1375 syscallarg(int) fd; 1376 syscallarg(const struct iovec *) iovp; 1377 syscallarg(int) iovcnt; 1378 syscallarg(off_t) offset; 1379 } */ *uap = v; 1380 struct filedesc *fdp = p->p_fd; 1381 struct file *fp; 1382 struct vnode *vp; 1383 off_t offset; 1384 int error, fd = SCARG(uap, fd); 1385 1386 if ((u_int)fd >= fdp->fd_nfiles || 1387 (fp = fdp->fd_ofiles[fd]) == NULL || 1388 (fp->f_flag & FWRITE) == 0) 1389 return (EBADF); 1390 1391 vp = (struct vnode *)fp->f_data; 1392 if (fp->f_type != DTYPE_VNODE 1393 || vp->v_type == VFIFO) 1394 return (ESPIPE); 1395 1396 offset = SCARG(uap, offset); 1397 1398 /* 1399 * XXX This works because no file systems actually 1400 * XXX take any action on the seek operation. 1401 */ 1402 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1403 return (error); 1404 1405 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1406 &offset, 0, retval)); 1407 } 1408 1409 /* 1410 * Check access permissions. 1411 */ 1412 int 1413 sys_access(p, v, retval) 1414 struct proc *p; 1415 void *v; 1416 register_t *retval; 1417 { 1418 register struct sys_access_args /* { 1419 syscallarg(const char *) path; 1420 syscallarg(int) flags; 1421 } */ *uap = v; 1422 register struct ucred *cred = p->p_ucred; 1423 register struct vnode *vp; 1424 int error, flags, t_gid, t_uid; 1425 struct nameidata nd; 1426 1427 t_uid = cred->cr_uid; 1428 t_gid = cred->cr_gid; 1429 cred->cr_uid = p->p_cred->p_ruid; 1430 cred->cr_gid = p->p_cred->p_rgid; 1431 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1432 SCARG(uap, path), p); 1433 if ((error = namei(&nd)) != 0) 1434 goto out1; 1435 vp = nd.ni_vp; 1436 1437 /* Flags == 0 means only check for existence. */ 1438 if (SCARG(uap, flags)) { 1439 flags = 0; 1440 if (SCARG(uap, flags) & R_OK) 1441 flags |= VREAD; 1442 if (SCARG(uap, flags) & W_OK) 1443 flags |= VWRITE; 1444 if (SCARG(uap, flags) & X_OK) 1445 flags |= VEXEC; 1446 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1447 error = VOP_ACCESS(vp, flags, cred, p); 1448 } 1449 vput(vp); 1450 out1: 1451 cred->cr_uid = t_uid; 1452 cred->cr_gid = t_gid; 1453 return (error); 1454 } 1455 1456 /* 1457 * Get file status; this version follows links. 1458 */ 1459 /* ARGSUSED */ 1460 int 1461 sys___stat13(p, v, retval) 1462 struct proc *p; 1463 void *v; 1464 register_t *retval; 1465 { 1466 register struct sys___stat13_args /* { 1467 syscallarg(const char *) path; 1468 syscallarg(struct stat *) ub; 1469 } */ *uap = v; 1470 struct stat sb; 1471 int error; 1472 struct nameidata nd; 1473 1474 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1475 SCARG(uap, path), p); 1476 if ((error = namei(&nd)) != 0) 1477 return (error); 1478 error = vn_stat(nd.ni_vp, &sb, p); 1479 vput(nd.ni_vp); 1480 if (error) 1481 return (error); 1482 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1483 return (error); 1484 } 1485 1486 /* 1487 * Get file status; this version does not follow links. 1488 */ 1489 /* ARGSUSED */ 1490 int 1491 sys___lstat13(p, v, retval) 1492 struct proc *p; 1493 void *v; 1494 register_t *retval; 1495 { 1496 register struct sys___lstat13_args /* { 1497 syscallarg(const char *) path; 1498 syscallarg(struct stat *) ub; 1499 } */ *uap = v; 1500 struct stat sb; 1501 int error; 1502 struct nameidata nd; 1503 1504 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1505 SCARG(uap, path), p); 1506 if ((error = namei(&nd)) != 0) 1507 return (error); 1508 error = vn_stat(nd.ni_vp, &sb, p); 1509 vput(nd.ni_vp); 1510 if (error) 1511 return (error); 1512 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1513 return (error); 1514 } 1515 1516 /* 1517 * Get configurable pathname variables. 1518 */ 1519 /* ARGSUSED */ 1520 int 1521 sys_pathconf(p, v, retval) 1522 struct proc *p; 1523 void *v; 1524 register_t *retval; 1525 { 1526 register struct sys_pathconf_args /* { 1527 syscallarg(const char *) path; 1528 syscallarg(int) name; 1529 } */ *uap = v; 1530 int error; 1531 struct nameidata nd; 1532 1533 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1534 SCARG(uap, path), p); 1535 if ((error = namei(&nd)) != 0) 1536 return (error); 1537 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1538 vput(nd.ni_vp); 1539 return (error); 1540 } 1541 1542 /* 1543 * Return target name of a symbolic link. 1544 */ 1545 /* ARGSUSED */ 1546 int 1547 sys_readlink(p, v, retval) 1548 struct proc *p; 1549 void *v; 1550 register_t *retval; 1551 { 1552 register struct sys_readlink_args /* { 1553 syscallarg(const char *) path; 1554 syscallarg(char *) buf; 1555 syscallarg(size_t) count; 1556 } */ *uap = v; 1557 register struct vnode *vp; 1558 struct iovec aiov; 1559 struct uio auio; 1560 int error; 1561 struct nameidata nd; 1562 1563 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1564 SCARG(uap, path), p); 1565 if ((error = namei(&nd)) != 0) 1566 return (error); 1567 vp = nd.ni_vp; 1568 if (vp->v_type != VLNK) 1569 error = EINVAL; 1570 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1571 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1572 aiov.iov_base = SCARG(uap, buf); 1573 aiov.iov_len = SCARG(uap, count); 1574 auio.uio_iov = &aiov; 1575 auio.uio_iovcnt = 1; 1576 auio.uio_offset = 0; 1577 auio.uio_rw = UIO_READ; 1578 auio.uio_segflg = UIO_USERSPACE; 1579 auio.uio_procp = p; 1580 auio.uio_resid = SCARG(uap, count); 1581 error = VOP_READLINK(vp, &auio, p->p_ucred); 1582 } 1583 vput(vp); 1584 *retval = SCARG(uap, count) - auio.uio_resid; 1585 return (error); 1586 } 1587 1588 /* 1589 * Change flags of a file given a path name. 1590 */ 1591 /* ARGSUSED */ 1592 int 1593 sys_chflags(p, v, retval) 1594 struct proc *p; 1595 void *v; 1596 register_t *retval; 1597 { 1598 register struct sys_chflags_args /* { 1599 syscallarg(const char *) path; 1600 syscallarg(u_long) flags; 1601 } */ *uap = v; 1602 register struct vnode *vp; 1603 struct vattr vattr; 1604 int error; 1605 struct nameidata nd; 1606 1607 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1608 if ((error = namei(&nd)) != 0) 1609 return (error); 1610 vp = nd.ni_vp; 1611 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1612 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1613 VATTR_NULL(&vattr); 1614 vattr.va_flags = SCARG(uap, flags); 1615 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1616 vput(vp); 1617 return (error); 1618 } 1619 1620 /* 1621 * Change flags of a file given a file descriptor. 1622 */ 1623 /* ARGSUSED */ 1624 int 1625 sys_fchflags(p, v, retval) 1626 struct proc *p; 1627 void *v; 1628 register_t *retval; 1629 { 1630 register struct sys_fchflags_args /* { 1631 syscallarg(int) fd; 1632 syscallarg(u_long) flags; 1633 } */ *uap = v; 1634 struct vattr vattr; 1635 struct vnode *vp; 1636 struct file *fp; 1637 int error; 1638 1639 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1640 return (error); 1641 vp = (struct vnode *)fp->f_data; 1642 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1643 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1644 VATTR_NULL(&vattr); 1645 vattr.va_flags = SCARG(uap, flags); 1646 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1647 VOP_UNLOCK(vp, 0); 1648 return (error); 1649 } 1650 1651 /* 1652 * Change mode of a file given path name; this version follows links. 1653 */ 1654 /* ARGSUSED */ 1655 int 1656 sys_chmod(p, v, retval) 1657 struct proc *p; 1658 void *v; 1659 register_t *retval; 1660 { 1661 register struct sys_chmod_args /* { 1662 syscallarg(const char *) path; 1663 syscallarg(int) mode; 1664 } */ *uap = v; 1665 int error; 1666 struct nameidata nd; 1667 1668 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1669 if ((error = namei(&nd)) != 0) 1670 return (error); 1671 1672 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1673 1674 vrele(nd.ni_vp); 1675 return (error); 1676 } 1677 1678 /* 1679 * Change mode of a file given a file descriptor. 1680 */ 1681 /* ARGSUSED */ 1682 int 1683 sys_fchmod(p, v, retval) 1684 struct proc *p; 1685 void *v; 1686 register_t *retval; 1687 { 1688 register struct sys_fchmod_args /* { 1689 syscallarg(int) fd; 1690 syscallarg(int) mode; 1691 } */ *uap = v; 1692 struct file *fp; 1693 int error; 1694 1695 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1696 return (error); 1697 1698 return (change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p)); 1699 } 1700 1701 /* 1702 * Change mode of a file given path name; this version does not follow links. 1703 */ 1704 /* ARGSUSED */ 1705 int 1706 sys_lchmod(p, v, retval) 1707 struct proc *p; 1708 void *v; 1709 register_t *retval; 1710 { 1711 register struct sys_lchmod_args /* { 1712 syscallarg(const char *) path; 1713 syscallarg(int) mode; 1714 } */ *uap = v; 1715 int error; 1716 struct nameidata nd; 1717 1718 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1719 if ((error = namei(&nd)) != 0) 1720 return (error); 1721 1722 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1723 1724 vrele(nd.ni_vp); 1725 return (error); 1726 } 1727 1728 /* 1729 * Common routine to set mode given a vnode. 1730 */ 1731 static int 1732 change_mode(vp, mode, p) 1733 struct vnode *vp; 1734 int mode; 1735 struct proc *p; 1736 { 1737 struct vattr vattr; 1738 int error; 1739 1740 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1741 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1742 VATTR_NULL(&vattr); 1743 vattr.va_mode = mode & ALLPERMS; 1744 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1745 VOP_UNLOCK(vp, 0); 1746 return (error); 1747 } 1748 1749 /* 1750 * Set ownership given a path name; this version follows links. 1751 */ 1752 /* ARGSUSED */ 1753 int 1754 sys_chown(p, v, retval) 1755 struct proc *p; 1756 void *v; 1757 register_t *retval; 1758 { 1759 register struct sys_chown_args /* { 1760 syscallarg(const char *) path; 1761 syscallarg(uid_t) uid; 1762 syscallarg(gid_t) gid; 1763 } */ *uap = v; 1764 int error; 1765 struct nameidata nd; 1766 1767 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1768 if ((error = namei(&nd)) != 0) 1769 return (error); 1770 1771 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1772 1773 vrele(nd.ni_vp); 1774 return (error); 1775 } 1776 1777 /* 1778 * Set ownership given a path name; this version follows links. 1779 * Provides POSIX semantics. 1780 */ 1781 /* ARGSUSED */ 1782 int 1783 sys___posix_chown(p, v, retval) 1784 struct proc *p; 1785 void *v; 1786 register_t *retval; 1787 { 1788 register struct sys_chown_args /* { 1789 syscallarg(const char *) path; 1790 syscallarg(uid_t) uid; 1791 syscallarg(gid_t) gid; 1792 } */ *uap = v; 1793 int error; 1794 struct nameidata nd; 1795 1796 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1797 if ((error = namei(&nd)) != 0) 1798 return (error); 1799 1800 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 1801 1802 vrele(nd.ni_vp); 1803 return (error); 1804 } 1805 1806 /* 1807 * Set ownership given a file descriptor. 1808 */ 1809 /* ARGSUSED */ 1810 int 1811 sys_fchown(p, v, retval) 1812 struct proc *p; 1813 void *v; 1814 register_t *retval; 1815 { 1816 register struct sys_fchown_args /* { 1817 syscallarg(int) fd; 1818 syscallarg(uid_t) uid; 1819 syscallarg(gid_t) gid; 1820 } */ *uap = v; 1821 int error; 1822 struct file *fp; 1823 1824 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1825 return (error); 1826 1827 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1828 SCARG(uap, gid), p, 0)); 1829 } 1830 1831 /* 1832 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 1833 */ 1834 /* ARGSUSED */ 1835 int 1836 sys___posix_fchown(p, v, retval) 1837 struct proc *p; 1838 void *v; 1839 register_t *retval; 1840 { 1841 register struct sys_fchown_args /* { 1842 syscallarg(int) fd; 1843 syscallarg(uid_t) uid; 1844 syscallarg(gid_t) gid; 1845 } */ *uap = v; 1846 int error; 1847 struct file *fp; 1848 1849 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1850 return (error); 1851 1852 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1853 SCARG(uap, gid), p, 1)); 1854 } 1855 1856 /* 1857 * Set ownership given a path name; this version does not follow links. 1858 */ 1859 /* ARGSUSED */ 1860 int 1861 sys_lchown(p, v, retval) 1862 struct proc *p; 1863 void *v; 1864 register_t *retval; 1865 { 1866 register struct sys_lchown_args /* { 1867 syscallarg(const char *) path; 1868 syscallarg(uid_t) uid; 1869 syscallarg(gid_t) gid; 1870 } */ *uap = v; 1871 int error; 1872 struct nameidata nd; 1873 1874 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1875 if ((error = namei(&nd)) != 0) 1876 return (error); 1877 1878 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1879 1880 vrele(nd.ni_vp); 1881 return (error); 1882 } 1883 1884 /* 1885 * Set ownership given a path name; this version does not follow links. 1886 * Provides POSIX/XPG semantics. 1887 */ 1888 /* ARGSUSED */ 1889 int 1890 sys___posix_lchown(p, v, retval) 1891 struct proc *p; 1892 void *v; 1893 register_t *retval; 1894 { 1895 register struct sys_lchown_args /* { 1896 syscallarg(const char *) path; 1897 syscallarg(uid_t) uid; 1898 syscallarg(gid_t) gid; 1899 } */ *uap = v; 1900 int error; 1901 struct nameidata nd; 1902 1903 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1904 if ((error = namei(&nd)) != 0) 1905 return (error); 1906 1907 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 1908 1909 vrele(nd.ni_vp); 1910 return (error); 1911 } 1912 1913 /* 1914 * Common routine to set ownership given a vnode. 1915 */ 1916 static int 1917 change_owner(vp, uid, gid, p, posix_semantics) 1918 register struct vnode *vp; 1919 uid_t uid; 1920 gid_t gid; 1921 struct proc *p; 1922 int posix_semantics; 1923 { 1924 struct vattr vattr; 1925 mode_t newmode; 1926 int error; 1927 1928 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1929 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1930 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 1931 goto out; 1932 1933 #define CHANGED(x) ((x) != -1) 1934 newmode = vattr.va_mode; 1935 if (posix_semantics) { 1936 /* 1937 * POSIX/XPG semantics: if the caller is not the super-user, 1938 * clear set-user-id and set-group-id bits. Both POSIX and 1939 * the XPG consider the behaviour for calls by the super-user 1940 * implementation-defined; we leave the set-user-id and set- 1941 * group-id settings intact in that case. 1942 */ 1943 if (suser(p->p_ucred, NULL) != 0) 1944 newmode &= ~(S_ISUID | S_ISGID); 1945 } else { 1946 /* 1947 * NetBSD semantics: when changing owner and/or group, 1948 * clear the respective bit(s). 1949 */ 1950 if (CHANGED(uid)) 1951 newmode &= ~S_ISUID; 1952 if (CHANGED(gid)) 1953 newmode &= ~S_ISGID; 1954 } 1955 /* Update va_mode iff altered. */ 1956 if (vattr.va_mode == newmode) 1957 newmode = VNOVAL; 1958 1959 VATTR_NULL(&vattr); 1960 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 1961 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 1962 vattr.va_mode = newmode; 1963 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1964 #undef CHANGED 1965 1966 out: 1967 VOP_UNLOCK(vp, 0); 1968 return (error); 1969 } 1970 1971 /* 1972 * Set the access and modification times given a path name; this 1973 * version follows links. 1974 */ 1975 /* ARGSUSED */ 1976 int 1977 sys_utimes(p, v, retval) 1978 struct proc *p; 1979 void *v; 1980 register_t *retval; 1981 { 1982 register struct sys_utimes_args /* { 1983 syscallarg(const char *) path; 1984 syscallarg(const struct timeval *) tptr; 1985 } */ *uap = v; 1986 int error; 1987 struct nameidata nd; 1988 1989 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1990 if ((error = namei(&nd)) != 0) 1991 return (error); 1992 1993 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1994 1995 vrele(nd.ni_vp); 1996 return (error); 1997 } 1998 1999 /* 2000 * Set the access and modification times given a file descriptor. 2001 */ 2002 /* ARGSUSED */ 2003 int 2004 sys_futimes(p, v, retval) 2005 struct proc *p; 2006 void *v; 2007 register_t *retval; 2008 { 2009 register struct sys_futimes_args /* { 2010 syscallarg(int) fd; 2011 syscallarg(const struct timeval *) tptr; 2012 } */ *uap = v; 2013 int error; 2014 struct file *fp; 2015 2016 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2017 return (error); 2018 2019 return (change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), 2020 p)); 2021 } 2022 2023 /* 2024 * Set the access and modification times given a path name; this 2025 * version does not follow links. 2026 */ 2027 /* ARGSUSED */ 2028 int 2029 sys_lutimes(p, v, retval) 2030 struct proc *p; 2031 void *v; 2032 register_t *retval; 2033 { 2034 register struct sys_lutimes_args /* { 2035 syscallarg(const char *) path; 2036 syscallarg(const struct timeval *) tptr; 2037 } */ *uap = v; 2038 int error; 2039 struct nameidata nd; 2040 2041 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2042 if ((error = namei(&nd)) != 0) 2043 return (error); 2044 2045 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2046 2047 vrele(nd.ni_vp); 2048 return (error); 2049 } 2050 2051 /* 2052 * Common routine to set access and modification times given a vnode. 2053 */ 2054 static int 2055 change_utimes(vp, tptr, p) 2056 struct vnode *vp; 2057 const struct timeval *tptr; 2058 struct proc *p; 2059 { 2060 struct timeval tv[2]; 2061 struct vattr vattr; 2062 int error; 2063 2064 VATTR_NULL(&vattr); 2065 if (tptr == NULL) { 2066 microtime(&tv[0]); 2067 tv[1] = tv[0]; 2068 vattr.va_vaflags |= VA_UTIMES_NULL; 2069 } else { 2070 error = copyin(tptr, tv, sizeof(tv)); 2071 if (error) 2072 return (error); 2073 } 2074 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2075 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2076 vattr.va_atime.tv_sec = tv[0].tv_sec; 2077 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2078 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2079 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2080 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2081 VOP_UNLOCK(vp, 0); 2082 return (error); 2083 } 2084 2085 /* 2086 * Truncate a file given its path name. 2087 */ 2088 /* ARGSUSED */ 2089 int 2090 sys_truncate(p, v, retval) 2091 struct proc *p; 2092 void *v; 2093 register_t *retval; 2094 { 2095 register struct sys_truncate_args /* { 2096 syscallarg(const char *) path; 2097 syscallarg(int) pad; 2098 syscallarg(off_t) length; 2099 } */ *uap = v; 2100 register struct vnode *vp; 2101 struct vattr vattr; 2102 int error; 2103 struct nameidata nd; 2104 2105 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2106 if ((error = namei(&nd)) != 0) 2107 return (error); 2108 vp = nd.ni_vp; 2109 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2110 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2111 if (vp->v_type == VDIR) 2112 error = EISDIR; 2113 else if ((error = vn_writechk(vp)) == 0 && 2114 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2115 VATTR_NULL(&vattr); 2116 vattr.va_size = SCARG(uap, length); 2117 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2118 } 2119 vput(vp); 2120 return (error); 2121 } 2122 2123 /* 2124 * Truncate a file given a file descriptor. 2125 */ 2126 /* ARGSUSED */ 2127 int 2128 sys_ftruncate(p, v, retval) 2129 struct proc *p; 2130 void *v; 2131 register_t *retval; 2132 { 2133 register struct sys_ftruncate_args /* { 2134 syscallarg(int) fd; 2135 syscallarg(int) pad; 2136 syscallarg(off_t) length; 2137 } */ *uap = v; 2138 struct vattr vattr; 2139 struct vnode *vp; 2140 struct file *fp; 2141 int error; 2142 2143 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2144 return (error); 2145 if ((fp->f_flag & FWRITE) == 0) 2146 return (EINVAL); 2147 vp = (struct vnode *)fp->f_data; 2148 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2149 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2150 if (vp->v_type == VDIR) 2151 error = EISDIR; 2152 else if ((error = vn_writechk(vp)) == 0) { 2153 VATTR_NULL(&vattr); 2154 vattr.va_size = SCARG(uap, length); 2155 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2156 } 2157 VOP_UNLOCK(vp, 0); 2158 return (error); 2159 } 2160 2161 /* 2162 * Sync an open file. 2163 */ 2164 /* ARGSUSED */ 2165 int 2166 sys_fsync(p, v, retval) 2167 struct proc *p; 2168 void *v; 2169 register_t *retval; 2170 { 2171 struct sys_fsync_args /* { 2172 syscallarg(int) fd; 2173 } */ *uap = v; 2174 register struct vnode *vp; 2175 struct file *fp; 2176 int error; 2177 2178 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2179 return (error); 2180 vp = (struct vnode *)fp->f_data; 2181 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2182 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2183 VOP_UNLOCK(vp, 0); 2184 return (error); 2185 } 2186 2187 /* 2188 * Sync the data of an open file. 2189 */ 2190 /* ARGSUSED */ 2191 int 2192 sys_fdatasync(p, v, retval) 2193 struct proc *p; 2194 void *v; 2195 register_t *retval; 2196 { 2197 struct sys_fdatasync_args /* { 2198 syscallarg(int) fd; 2199 } */ *uap = v; 2200 struct vnode *vp; 2201 struct file *fp; 2202 int error; 2203 2204 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2205 return (error); 2206 vp = (struct vnode *)fp->f_data; 2207 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2208 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2209 VOP_UNLOCK(vp, 0); 2210 return (error); 2211 } 2212 2213 /* 2214 * Rename files, (standard) BSD semantics frontend. 2215 */ 2216 /* ARGSUSED */ 2217 int 2218 sys_rename(p, v, retval) 2219 struct proc *p; 2220 void *v; 2221 register_t *retval; 2222 { 2223 register struct sys_rename_args /* { 2224 syscallarg(const char *) from; 2225 syscallarg(const char *) to; 2226 } */ *uap = v; 2227 2228 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2229 } 2230 2231 /* 2232 * Rename files, POSIX semantics frontend. 2233 */ 2234 /* ARGSUSED */ 2235 int 2236 sys___posix_rename(p, v, retval) 2237 struct proc *p; 2238 void *v; 2239 register_t *retval; 2240 { 2241 register struct sys___posix_rename_args /* { 2242 syscallarg(const char *) from; 2243 syscallarg(const char *) to; 2244 } */ *uap = v; 2245 2246 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2247 } 2248 2249 /* 2250 * Rename files. Source and destination must either both be directories, 2251 * or both not be directories. If target is a directory, it must be empty. 2252 * If `from' and `to' refer to the same object, the value of the `retain' 2253 * argument is used to determine whether `from' will be 2254 * 2255 * (retain == 0) deleted unless `from' and `to' refer to the same 2256 * object in the file system's name space (BSD). 2257 * (retain == 1) always retained (POSIX). 2258 */ 2259 static int 2260 rename_files(from, to, p, retain) 2261 const char *from, *to; 2262 struct proc *p; 2263 int retain; 2264 { 2265 register struct vnode *tvp, *fvp, *tdvp; 2266 struct nameidata fromnd, tond; 2267 int error; 2268 2269 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2270 from, p); 2271 if ((error = namei(&fromnd)) != 0) 2272 return (error); 2273 fvp = fromnd.ni_vp; 2274 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2275 UIO_USERSPACE, to, p); 2276 if ((error = namei(&tond)) != 0) { 2277 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2278 vrele(fromnd.ni_dvp); 2279 vrele(fvp); 2280 goto out1; 2281 } 2282 tdvp = tond.ni_dvp; 2283 tvp = tond.ni_vp; 2284 2285 if (tvp != NULL) { 2286 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2287 error = ENOTDIR; 2288 goto out; 2289 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2290 error = EISDIR; 2291 goto out; 2292 } 2293 } 2294 2295 if (fvp == tdvp) 2296 error = EINVAL; 2297 2298 /* 2299 * Source and destination refer to the same object. 2300 */ 2301 if (fvp == tvp) { 2302 if (retain) 2303 error = -1; 2304 else if (fromnd.ni_dvp == tdvp && 2305 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2306 !bcmp(fromnd.ni_cnd.cn_nameptr, 2307 tond.ni_cnd.cn_nameptr, 2308 fromnd.ni_cnd.cn_namelen)) 2309 error = -1; 2310 } 2311 2312 out: 2313 if (!error) { 2314 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2315 if (fromnd.ni_dvp != tdvp) 2316 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2317 if (tvp) { 2318 #if defined(UVM) 2319 (void)uvm_vnp_uncache(tvp); 2320 #else 2321 (void)vnode_pager_uncache(tvp); 2322 #endif 2323 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2324 } 2325 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2326 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2327 } else { 2328 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2329 if (tdvp == tvp) 2330 vrele(tdvp); 2331 else 2332 vput(tdvp); 2333 if (tvp) 2334 vput(tvp); 2335 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2336 vrele(fromnd.ni_dvp); 2337 vrele(fvp); 2338 } 2339 vrele(tond.ni_startdir); 2340 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2341 out1: 2342 if (fromnd.ni_startdir) 2343 vrele(fromnd.ni_startdir); 2344 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2345 return (error == -1 ? 0 : error); 2346 } 2347 2348 /* 2349 * Make a directory file. 2350 */ 2351 /* ARGSUSED */ 2352 int 2353 sys_mkdir(p, v, retval) 2354 struct proc *p; 2355 void *v; 2356 register_t *retval; 2357 { 2358 register struct sys_mkdir_args /* { 2359 syscallarg(const char *) path; 2360 syscallarg(int) mode; 2361 } */ *uap = v; 2362 register struct vnode *vp; 2363 struct vattr vattr; 2364 int error; 2365 struct nameidata nd; 2366 2367 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2368 if ((error = namei(&nd)) != 0) 2369 return (error); 2370 vp = nd.ni_vp; 2371 if (vp != NULL) { 2372 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2373 if (nd.ni_dvp == vp) 2374 vrele(nd.ni_dvp); 2375 else 2376 vput(nd.ni_dvp); 2377 vrele(vp); 2378 return (EEXIST); 2379 } 2380 VATTR_NULL(&vattr); 2381 vattr.va_type = VDIR; 2382 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 2383 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2384 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2385 if (!error) 2386 vput(nd.ni_vp); 2387 return (error); 2388 } 2389 2390 /* 2391 * Remove a directory file. 2392 */ 2393 /* ARGSUSED */ 2394 int 2395 sys_rmdir(p, v, retval) 2396 struct proc *p; 2397 void *v; 2398 register_t *retval; 2399 { 2400 struct sys_rmdir_args /* { 2401 syscallarg(const char *) path; 2402 } */ *uap = v; 2403 register struct vnode *vp; 2404 int error; 2405 struct nameidata nd; 2406 2407 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2408 SCARG(uap, path), p); 2409 if ((error = namei(&nd)) != 0) 2410 return (error); 2411 vp = nd.ni_vp; 2412 if (vp->v_type != VDIR) { 2413 error = ENOTDIR; 2414 goto out; 2415 } 2416 /* 2417 * No rmdir "." please. 2418 */ 2419 if (nd.ni_dvp == vp) { 2420 error = EINVAL; 2421 goto out; 2422 } 2423 /* 2424 * The root of a mounted filesystem cannot be deleted. 2425 */ 2426 if (vp->v_flag & VROOT) 2427 error = EBUSY; 2428 out: 2429 if (!error) { 2430 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2431 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2432 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2433 } else { 2434 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2435 if (nd.ni_dvp == vp) 2436 vrele(nd.ni_dvp); 2437 else 2438 vput(nd.ni_dvp); 2439 vput(vp); 2440 } 2441 return (error); 2442 } 2443 2444 /* 2445 * Read a block of directory entries in a file system independent format. 2446 */ 2447 int 2448 sys_getdents(p, v, retval) 2449 struct proc *p; 2450 void *v; 2451 register_t *retval; 2452 { 2453 register struct sys_getdents_args /* { 2454 syscallarg(int) fd; 2455 syscallarg(char *) buf; 2456 syscallarg(size_t) count; 2457 } */ *uap = v; 2458 struct file *fp; 2459 int error, done; 2460 2461 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2462 return (error); 2463 if ((fp->f_flag & FREAD) == 0) 2464 return (EBADF); 2465 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2466 SCARG(uap, count), &done, p, 0, 0); 2467 *retval = done; 2468 return (error); 2469 } 2470 2471 /* 2472 * Set the mode mask for creation of filesystem nodes. 2473 */ 2474 int 2475 sys_umask(p, v, retval) 2476 struct proc *p; 2477 void *v; 2478 register_t *retval; 2479 { 2480 struct sys_umask_args /* { 2481 syscallarg(mode_t) newmask; 2482 } */ *uap = v; 2483 register struct filedesc *fdp; 2484 2485 fdp = p->p_fd; 2486 *retval = fdp->fd_cmask; 2487 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2488 return (0); 2489 } 2490 2491 /* 2492 * Void all references to file by ripping underlying filesystem 2493 * away from vnode. 2494 */ 2495 /* ARGSUSED */ 2496 int 2497 sys_revoke(p, v, retval) 2498 struct proc *p; 2499 void *v; 2500 register_t *retval; 2501 { 2502 register struct sys_revoke_args /* { 2503 syscallarg(const char *) path; 2504 } */ *uap = v; 2505 register struct vnode *vp; 2506 struct vattr vattr; 2507 int error; 2508 struct nameidata nd; 2509 2510 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2511 if ((error = namei(&nd)) != 0) 2512 return (error); 2513 vp = nd.ni_vp; 2514 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2515 goto out; 2516 if (p->p_ucred->cr_uid != vattr.va_uid && 2517 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2518 goto out; 2519 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2520 VOP_REVOKE(vp, REVOKEALL); 2521 out: 2522 vrele(vp); 2523 return (error); 2524 } 2525 2526 /* 2527 * Convert a user file descriptor to a kernel file entry. 2528 */ 2529 int 2530 getvnode(fdp, fd, fpp) 2531 struct filedesc *fdp; 2532 int fd; 2533 struct file **fpp; 2534 { 2535 struct vnode *vp; 2536 struct file *fp; 2537 2538 if ((u_int)fd >= fdp->fd_nfiles || 2539 (fp = fdp->fd_ofiles[fd]) == NULL) 2540 return (EBADF); 2541 if (fp->f_type != DTYPE_VNODE) 2542 return (EINVAL); 2543 vp = (struct vnode *)fp->f_data; 2544 if (vp->v_type == VBAD) 2545 return (EBADF); 2546 *fpp = fp; 2547 return (0); 2548 } 2549
Indexes created Thu Sep 25 16:09:42 GMT 2025