vfs_syscalls.c revision 1.129
1 /* $NetBSD: vfs_syscalls.c,v 1.129 1999/03/02 07:47:49 fvdl 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 #include "opt_compat_43.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/namei.h> 50 #include <sys/filedesc.h> 51 #include <sys/kernel.h> 52 #include <sys/file.h> 53 #include <sys/stat.h> 54 #include <sys/vnode.h> 55 #include <sys/mount.h> 56 #include <sys/proc.h> 57 #include <sys/uio.h> 58 #include <sys/malloc.h> 59 #include <sys/dirent.h> 60 61 #include <sys/syscallargs.h> 62 63 #include <vm/vm.h> 64 #include <sys/sysctl.h> 65 66 #if defined(UVM) 67 #include <uvm/uvm_extern.h> 68 #endif 69 70 static int change_dir __P((struct nameidata *, struct proc *)); 71 static int change_mode __P((struct vnode *, int, struct proc *p)); 72 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 73 int)); 74 static int change_utimes __P((struct vnode *vp, const struct timeval *, 75 struct proc *p)); 76 static int rename_files __P((const char *, const char *, struct proc *, int)); 77 78 void checkdirs __P((struct vnode *)); 79 int dounmount __P((struct mount *, int, struct proc *)); 80 81 /* 82 * Virtual File System System Calls 83 */ 84 85 /* 86 * Mount a file system. 87 */ 88 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 * Also note that not all of these had actual numbers in 4.3BSD 94 * or NetBSD 0.9! 95 */ 96 const char *mountcompatnames[] = { 97 NULL, /* 0 = MOUNT_NONE */ 98 MOUNT_FFS, /* 1 */ 99 MOUNT_NFS, /* 2 */ 100 MOUNT_MFS, /* 3 */ 101 MOUNT_MSDOS, /* 4 */ 102 MOUNT_LFS, /* 5 */ 103 NULL, /* 6 = MOUNT_LOFS */ 104 MOUNT_FDESC, /* 7 */ 105 MOUNT_PORTAL, /* 8 */ 106 MOUNT_NULL, /* 9 */ 107 MOUNT_UMAP, /* 10 */ 108 MOUNT_KERNFS, /* 11 */ 109 MOUNT_PROCFS, /* 12 */ 110 MOUNT_AFS, /* 13 */ 111 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 112 MOUNT_UNION, /* 15 */ 113 MOUNT_ADOSFS, /* 16 */ 114 MOUNT_EXT2FS, /* 17 */ 115 MOUNT_CODA, /* 18 */ 116 MOUNT_FILECORE, /* 19 */ 117 }; 118 const int nmountcompatnames = sizeof(mountcompatnames) / 119 sizeof(mountcompatnames[0]); 120 121 /* ARGSUSED */ 122 int 123 sys_mount(p, v, retval) 124 struct proc *p; 125 void *v; 126 register_t *retval; 127 { 128 register struct sys_mount_args /* { 129 syscallarg(const char *) type; 130 syscallarg(const char *) path; 131 syscallarg(int) flags; 132 syscallarg(void *) data; 133 } */ *uap = v; 134 struct vnode *vp; 135 struct mount *mp; 136 int error, flag = 0; 137 char fstypename[MFSNAMELEN]; 138 struct vattr va; 139 struct nameidata nd; 140 struct vfsops *vfs; 141 142 /* 143 * Get vnode to be covered 144 */ 145 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 146 SCARG(uap, path), p); 147 if ((error = namei(&nd)) != 0) 148 return (error); 149 vp = nd.ni_vp; 150 /* 151 * A lookup in VFS_MOUNT might result in an attempt to 152 * lock this vnode again, so make the lock resursive. 153 */ 154 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 155 if (SCARG(uap, flags) & MNT_UPDATE) { 156 if ((vp->v_flag & VROOT) == 0) { 157 vput(vp); 158 return (EINVAL); 159 } 160 mp = vp->v_mount; 161 flag = mp->mnt_flag; 162 vfs = mp->mnt_op; 163 /* 164 * We only allow the filesystem to be reloaded if it 165 * is currently mounted read-only. 166 */ 167 if ((SCARG(uap, flags) & MNT_RELOAD) && 168 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 169 vput(vp); 170 return (EOPNOTSUPP); /* Needs translation */ 171 } 172 /* 173 * In "highly secure" mode, don't let the caller do anything 174 * but downgrade a filesystem from read-write to read-only. 175 * (see also below; MNT_UPDATE is required.) 176 */ 177 if (securelevel >= 2 && 178 (SCARG(uap, flags) != 179 (mp->mnt_flag | MNT_RDONLY | 180 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 181 vput(vp); 182 return (EPERM); 183 } 184 mp->mnt_flag |= 185 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 186 /* 187 * Only root, or the user that did the original mount is 188 * permitted to update it. 189 */ 190 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 191 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 192 vput(vp); 193 return (error); 194 } 195 /* 196 * Do not allow NFS export by non-root users. Silently 197 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 198 */ 199 if (p->p_ucred->cr_uid != 0) { 200 if (SCARG(uap, flags) & MNT_EXPORTED) { 201 vput(vp); 202 return (EPERM); 203 } 204 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 205 } 206 if (vfs_busy(mp, LK_NOWAIT, 0)) { 207 vput(vp); 208 return (EPERM); 209 } 210 VOP_UNLOCK(vp, 0); 211 goto update; 212 } else { 213 if (securelevel >= 2) 214 return (EPERM); 215 } 216 /* 217 * If the user is not root, ensure that they own the directory 218 * onto which we are attempting to mount. 219 */ 220 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 221 (va.va_uid != p->p_ucred->cr_uid && 222 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 223 vput(vp); 224 return (error); 225 } 226 /* 227 * Do not allow NFS export by non-root users. Silently 228 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 229 */ 230 if (p->p_ucred->cr_uid != 0) { 231 if (SCARG(uap, flags) & MNT_EXPORTED) { 232 vput(vp); 233 return (EPERM); 234 } 235 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 236 } 237 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 238 return (error); 239 if (vp->v_type != VDIR) { 240 vput(vp); 241 return (ENOTDIR); 242 } 243 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 244 if (error) { 245 #if defined(COMPAT_09) || defined(COMPAT_43) 246 /* 247 * Historically filesystem types were identified by number. 248 * If we get an integer for the filesystem type instead of a 249 * string, we check to see if it matches one of the historic 250 * filesystem types. 251 */ 252 u_long fsindex = (u_long)SCARG(uap, type); 253 if (fsindex >= nmountcompatnames || 254 mountcompatnames[fsindex] == NULL) { 255 vput(vp); 256 return (ENODEV); 257 } 258 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 259 #else 260 vput(vp); 261 return (error); 262 #endif 263 } 264 #ifdef COMPAT_10 265 /* Accept `ufs' as an alias for `ffs'. */ 266 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 267 strncpy(fstypename, "ffs", MFSNAMELEN); 268 #endif 269 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 270 vput(vp); 271 return (ENODEV); 272 } 273 if (vp->v_mountedhere != NULL) { 274 vput(vp); 275 return (EBUSY); 276 } 277 278 /* 279 * Allocate and initialize the file system. 280 */ 281 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 282 M_MOUNT, M_WAITOK); 283 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 284 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 285 (void)vfs_busy(mp, LK_NOWAIT, 0); 286 mp->mnt_op = vfs; 287 vfs->vfs_refcount++; 288 mp->mnt_vnodecovered = vp; 289 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 290 update: 291 /* 292 * Set the mount level flags. 293 */ 294 if (SCARG(uap, flags) & MNT_RDONLY) 295 mp->mnt_flag |= MNT_RDONLY; 296 else if (mp->mnt_flag & MNT_RDONLY) 297 mp->mnt_flag |= MNT_WANTRDWR; 298 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 299 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 300 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 301 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 302 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 303 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 304 /* 305 * Mount the filesystem. 306 */ 307 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 308 if (mp->mnt_flag & MNT_UPDATE) { 309 vrele(vp); 310 if (mp->mnt_flag & MNT_WANTRDWR) 311 mp->mnt_flag &= ~MNT_RDONLY; 312 mp->mnt_flag &=~ 313 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 314 if (error) 315 mp->mnt_flag = flag; 316 vfs_unbusy(mp); 317 return (error); 318 } 319 /* 320 * Put the new filesystem on the mount list after root. 321 */ 322 cache_purge(vp); 323 if (!error) { 324 vp->v_mountedhere = mp; 325 simple_lock(&mountlist_slock); 326 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 327 simple_unlock(&mountlist_slock); 328 checkdirs(vp); 329 VOP_UNLOCK(vp, 0); 330 vfs_unbusy(mp); 331 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 332 if ((error = VFS_START(mp, 0, p))) 333 vrele(vp); 334 } else { 335 vp->v_mountedhere = (struct mount *)0; 336 vfs->vfs_refcount--; 337 vfs_unbusy(mp); 338 free((caddr_t)mp, M_MOUNT); 339 vput(vp); 340 } 341 return (error); 342 } 343 344 /* 345 * Scan all active processes to see if any of them have a current 346 * or root directory onto which the new filesystem has just been 347 * mounted. If so, replace them with the new mount point. 348 */ 349 void 350 checkdirs(olddp) 351 struct vnode *olddp; 352 { 353 struct filedesc *fdp; 354 struct vnode *newdp; 355 struct proc *p; 356 357 if (olddp->v_usecount == 1) 358 return; 359 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 360 panic("mount: lost mount"); 361 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 362 fdp = p->p_fd; 363 if (fdp->fd_cdir == olddp) { 364 vrele(fdp->fd_cdir); 365 VREF(newdp); 366 fdp->fd_cdir = newdp; 367 } 368 if (fdp->fd_rdir == olddp) { 369 vrele(fdp->fd_rdir); 370 VREF(newdp); 371 fdp->fd_rdir = newdp; 372 } 373 } 374 if (rootvnode == olddp) { 375 vrele(rootvnode); 376 VREF(newdp); 377 rootvnode = newdp; 378 } 379 vput(newdp); 380 } 381 382 /* 383 * Unmount a file system. 384 * 385 * Note: unmount takes a path to the vnode mounted on as argument, 386 * not special file (as before). 387 */ 388 /* ARGSUSED */ 389 int 390 sys_unmount(p, v, retval) 391 struct proc *p; 392 void *v; 393 register_t *retval; 394 { 395 register struct sys_unmount_args /* { 396 syscallarg(const char *) path; 397 syscallarg(int) flags; 398 } */ *uap = v; 399 register struct vnode *vp; 400 struct mount *mp; 401 int error; 402 struct nameidata nd; 403 404 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 405 SCARG(uap, path), p); 406 if ((error = namei(&nd)) != 0) 407 return (error); 408 vp = nd.ni_vp; 409 mp = vp->v_mount; 410 411 /* 412 * Only root, or the user that did the original mount is 413 * permitted to unmount this filesystem. 414 */ 415 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 416 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 417 vput(vp); 418 return (error); 419 } 420 421 /* 422 * Don't allow unmounting the root file system. 423 */ 424 if (mp->mnt_flag & MNT_ROOTFS) { 425 vput(vp); 426 return (EINVAL); 427 } 428 429 /* 430 * Must be the root of the filesystem 431 */ 432 if ((vp->v_flag & VROOT) == 0) { 433 vput(vp); 434 return (EINVAL); 435 } 436 vput(vp); 437 438 if (vfs_busy(mp, 0, 0)) 439 return (EBUSY); 440 441 return (dounmount(mp, SCARG(uap, flags), p)); 442 } 443 444 /* 445 * Do the actual file system unmount. File system is assumed to have been 446 * marked busy by the caller. 447 */ 448 int 449 dounmount(mp, flags, p) 450 register struct mount *mp; 451 int flags; 452 struct proc *p; 453 { 454 struct vnode *coveredvp; 455 int error; 456 457 simple_lock(&mountlist_slock); 458 mp->mnt_flag |= MNT_UNMOUNT; 459 vfs_unbusy(mp); 460 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 461 if (mp->mnt_flag & MNT_EXPUBLIC) 462 vfs_setpublicfs(NULL, NULL, NULL); 463 mp->mnt_flag &=~ MNT_ASYNC; 464 #if !defined(UVM) 465 vnode_pager_umount(mp); /* release cached vnodes */ 466 #endif 467 cache_purgevfs(mp); /* remove cache entries for this file sys */ 468 if (((mp->mnt_flag & MNT_RDONLY) || 469 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 470 (flags & MNT_FORCE)) 471 error = VFS_UNMOUNT(mp, flags, p); 472 simple_lock(&mountlist_slock); 473 if (error) { 474 mp->mnt_flag &= ~MNT_UNMOUNT; 475 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 476 &mountlist_slock); 477 if (mp->mnt_flag & MNT_MWAIT) 478 wakeup((caddr_t)mp); 479 return (error); 480 } 481 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 482 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 483 coveredvp->v_mountedhere = NULL; 484 vrele(coveredvp); 485 } 486 mp->mnt_op->vfs_refcount--; 487 if (mp->mnt_vnodelist.lh_first != NULL) 488 panic("unmount: dangling vnode"); 489 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 490 if (mp->mnt_flag & MNT_MWAIT) 491 wakeup((caddr_t)mp); 492 free((caddr_t)mp, M_MOUNT); 493 return (0); 494 } 495 496 /* 497 * Sync each mounted filesystem. 498 */ 499 #ifdef DEBUG 500 int syncprt = 0; 501 struct ctldebug debug0 = { "syncprt", &syncprt }; 502 #endif 503 504 /* ARGSUSED */ 505 int 506 sys_sync(p, v, retval) 507 struct proc *p; 508 void *v; 509 register_t *retval; 510 { 511 register struct mount *mp, *nmp; 512 int asyncflag; 513 514 simple_lock(&mountlist_slock); 515 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 516 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 517 nmp = mp->mnt_list.cqe_prev; 518 continue; 519 } 520 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 521 asyncflag = mp->mnt_flag & MNT_ASYNC; 522 mp->mnt_flag &= ~MNT_ASYNC; 523 #if defined(UVM) 524 uvm_vnp_sync(mp); 525 #else 526 vnode_pager_sync(mp); 527 #endif 528 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 529 if (asyncflag) 530 mp->mnt_flag |= MNT_ASYNC; 531 } 532 simple_lock(&mountlist_slock); 533 nmp = mp->mnt_list.cqe_prev; 534 vfs_unbusy(mp); 535 536 } 537 simple_unlock(&mountlist_slock); 538 #ifdef DEBUG 539 if (syncprt) 540 vfs_bufstats(); 541 #endif /* DEBUG */ 542 return (0); 543 } 544 545 /* 546 * Change filesystem quotas. 547 */ 548 /* ARGSUSED */ 549 int 550 sys_quotactl(p, v, retval) 551 struct proc *p; 552 void *v; 553 register_t *retval; 554 { 555 register struct sys_quotactl_args /* { 556 syscallarg(const char *) path; 557 syscallarg(int) cmd; 558 syscallarg(int) uid; 559 syscallarg(caddr_t) arg; 560 } */ *uap = v; 561 register struct mount *mp; 562 int error; 563 struct nameidata nd; 564 565 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 566 if ((error = namei(&nd)) != 0) 567 return (error); 568 mp = nd.ni_vp->v_mount; 569 vrele(nd.ni_vp); 570 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 571 SCARG(uap, arg), p)); 572 } 573 574 /* 575 * Get filesystem statistics. 576 */ 577 /* ARGSUSED */ 578 int 579 sys_statfs(p, v, retval) 580 struct proc *p; 581 void *v; 582 register_t *retval; 583 { 584 register struct sys_statfs_args /* { 585 syscallarg(const char *) path; 586 syscallarg(struct statfs *) buf; 587 } */ *uap = v; 588 register struct mount *mp; 589 register struct statfs *sp; 590 int error; 591 struct nameidata nd; 592 593 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 594 if ((error = namei(&nd)) != 0) 595 return (error); 596 mp = nd.ni_vp->v_mount; 597 sp = &mp->mnt_stat; 598 vrele(nd.ni_vp); 599 if ((error = VFS_STATFS(mp, sp, p)) != 0) 600 return (error); 601 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 602 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 603 } 604 605 /* 606 * Get filesystem statistics. 607 */ 608 /* ARGSUSED */ 609 int 610 sys_fstatfs(p, v, retval) 611 struct proc *p; 612 void *v; 613 register_t *retval; 614 { 615 register struct sys_fstatfs_args /* { 616 syscallarg(int) fd; 617 syscallarg(struct statfs *) buf; 618 } */ *uap = v; 619 struct file *fp; 620 struct mount *mp; 621 register struct statfs *sp; 622 int error; 623 624 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 625 return (error); 626 mp = ((struct vnode *)fp->f_data)->v_mount; 627 sp = &mp->mnt_stat; 628 if ((error = VFS_STATFS(mp, sp, p)) != 0) 629 return (error); 630 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 631 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 632 } 633 634 /* 635 * Get statistics on all filesystems. 636 */ 637 int 638 sys_getfsstat(p, v, retval) 639 struct proc *p; 640 void *v; 641 register_t *retval; 642 { 643 register struct sys_getfsstat_args /* { 644 syscallarg(struct statfs *) buf; 645 syscallarg(long) bufsize; 646 syscallarg(int) flags; 647 } */ *uap = v; 648 register struct mount *mp, *nmp; 649 register struct statfs *sp; 650 caddr_t sfsp; 651 long count, maxcount, error; 652 653 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 654 sfsp = (caddr_t)SCARG(uap, buf); 655 simple_lock(&mountlist_slock); 656 count = 0; 657 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 658 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 659 nmp = mp->mnt_list.cqe_next; 660 continue; 661 } 662 if (sfsp && count < maxcount) { 663 sp = &mp->mnt_stat; 664 /* 665 * If MNT_NOWAIT is specified, do not refresh the 666 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 667 */ 668 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 669 (SCARG(uap, flags) & MNT_WAIT)) && 670 (error = VFS_STATFS(mp, sp, p)) != 0) { 671 simple_lock(&mountlist_slock); 672 nmp = mp->mnt_list.cqe_next; 673 vfs_unbusy(mp); 674 continue; 675 } 676 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 677 error = copyout(sp, sfsp, sizeof(*sp)); 678 if (error) 679 return (error); 680 sfsp += sizeof(*sp); 681 } 682 count++; 683 simple_lock(&mountlist_slock); 684 nmp = mp->mnt_list.cqe_next; 685 vfs_unbusy(mp); 686 } 687 simple_unlock(&mountlist_slock); 688 if (sfsp && count > maxcount) 689 *retval = maxcount; 690 else 691 *retval = count; 692 return (0); 693 } 694 695 /* 696 * Change current working directory to a given file descriptor. 697 */ 698 /* ARGSUSED */ 699 int 700 sys_fchdir(p, v, retval) 701 struct proc *p; 702 void *v; 703 register_t *retval; 704 { 705 struct sys_fchdir_args /* { 706 syscallarg(int) fd; 707 } */ *uap = v; 708 register struct filedesc *fdp = p->p_fd; 709 struct vnode *vp, *tdp; 710 struct mount *mp; 711 struct file *fp; 712 int error; 713 714 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 715 return (error); 716 vp = (struct vnode *)fp->f_data; 717 VREF(vp); 718 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 719 if (vp->v_type != VDIR) 720 error = ENOTDIR; 721 else 722 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 723 while (!error && (mp = vp->v_mountedhere) != NULL) { 724 if (vfs_busy(mp, 0, 0)) 725 continue; 726 error = VFS_ROOT(mp, &tdp); 727 vfs_unbusy(mp); 728 if (error) 729 break; 730 vput(vp); 731 vp = tdp; 732 } 733 if (error) { 734 vput(vp); 735 return (error); 736 } 737 VOP_UNLOCK(vp, 0); 738 vrele(fdp->fd_cdir); 739 fdp->fd_cdir = vp; 740 return (0); 741 } 742 743 /* 744 * Change current working directory (``.''). 745 */ 746 /* ARGSUSED */ 747 int 748 sys_chdir(p, v, retval) 749 struct proc *p; 750 void *v; 751 register_t *retval; 752 { 753 struct sys_chdir_args /* { 754 syscallarg(const char *) path; 755 } */ *uap = v; 756 register struct filedesc *fdp = p->p_fd; 757 int error; 758 struct nameidata nd; 759 760 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 761 SCARG(uap, path), p); 762 if ((error = change_dir(&nd, p)) != 0) 763 return (error); 764 vrele(fdp->fd_cdir); 765 fdp->fd_cdir = nd.ni_vp; 766 return (0); 767 } 768 769 /* 770 * Change notion of root (``/'') directory. 771 */ 772 /* ARGSUSED */ 773 int 774 sys_chroot(p, v, retval) 775 struct proc *p; 776 void *v; 777 register_t *retval; 778 { 779 struct sys_chroot_args /* { 780 syscallarg(const char *) path; 781 } */ *uap = v; 782 register struct filedesc *fdp = p->p_fd; 783 int error; 784 struct nameidata nd; 785 786 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 787 return (error); 788 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 789 SCARG(uap, path), p); 790 if ((error = change_dir(&nd, p)) != 0) 791 return (error); 792 if (fdp->fd_rdir != NULL) 793 vrele(fdp->fd_rdir); 794 fdp->fd_rdir = nd.ni_vp; 795 return (0); 796 } 797 798 /* 799 * Common routine for chroot and chdir. 800 */ 801 static int 802 change_dir(ndp, p) 803 register struct nameidata *ndp; 804 struct proc *p; 805 { 806 struct vnode *vp; 807 int error; 808 809 if ((error = namei(ndp)) != 0) 810 return (error); 811 vp = ndp->ni_vp; 812 if (vp->v_type != VDIR) 813 error = ENOTDIR; 814 else 815 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 816 817 if (error) 818 vput(vp); 819 else 820 VOP_UNLOCK(vp, 0); 821 return (error); 822 } 823 824 /* 825 * Check permissions, allocate an open file structure, 826 * and call the device open routine if any. 827 */ 828 int 829 sys_open(p, v, retval) 830 struct proc *p; 831 void *v; 832 register_t *retval; 833 { 834 register struct sys_open_args /* { 835 syscallarg(const char *) path; 836 syscallarg(int) flags; 837 syscallarg(int) mode; 838 } */ *uap = v; 839 register struct filedesc *fdp = p->p_fd; 840 register struct file *fp; 841 register struct vnode *vp; 842 int flags, cmode; 843 struct file *nfp; 844 int type, indx, error; 845 struct flock lf; 846 struct nameidata nd; 847 extern struct fileops vnops; 848 849 flags = FFLAGS(SCARG(uap, flags)); 850 if ((flags & (FREAD | FWRITE)) == 0) 851 return (EINVAL); 852 if ((error = falloc(p, &nfp, &indx)) != 0) 853 return (error); 854 fp = nfp; 855 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 856 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 857 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 858 if ((error = vn_open(&nd, flags, cmode)) != 0) { 859 ffree(fp); 860 if ((error == ENODEV || error == ENXIO) && 861 p->p_dupfd >= 0 && /* XXX from fdopen */ 862 (error = 863 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 864 *retval = indx; 865 return (0); 866 } 867 if (error == ERESTART) 868 error = EINTR; 869 fdp->fd_ofiles[indx] = NULL; 870 return (error); 871 } 872 p->p_dupfd = 0; 873 vp = nd.ni_vp; 874 fp->f_flag = flags & FMASK; 875 fp->f_type = DTYPE_VNODE; 876 fp->f_ops = &vnops; 877 fp->f_data = (caddr_t)vp; 878 if (flags & (O_EXLOCK | O_SHLOCK)) { 879 lf.l_whence = SEEK_SET; 880 lf.l_start = 0; 881 lf.l_len = 0; 882 if (flags & O_EXLOCK) 883 lf.l_type = F_WRLCK; 884 else 885 lf.l_type = F_RDLCK; 886 type = F_FLOCK; 887 if ((flags & FNONBLOCK) == 0) 888 type |= F_WAIT; 889 VOP_UNLOCK(vp, 0); 890 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 891 if (error) { 892 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 893 ffree(fp); 894 fdp->fd_ofiles[indx] = NULL; 895 return (error); 896 } 897 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 898 fp->f_flag |= FHASLOCK; 899 } 900 VOP_UNLOCK(vp, 0); 901 *retval = indx; 902 return (0); 903 } 904 905 /* 906 * Create a special file. 907 */ 908 /* ARGSUSED */ 909 int 910 sys_mknod(p, v, retval) 911 struct proc *p; 912 void *v; 913 register_t *retval; 914 { 915 register struct sys_mknod_args /* { 916 syscallarg(const char *) path; 917 syscallarg(int) mode; 918 syscallarg(int) dev; 919 } */ *uap = v; 920 register struct vnode *vp; 921 struct vattr vattr; 922 int error; 923 int whiteout = 0; 924 struct nameidata nd; 925 926 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 927 return (error); 928 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 929 if ((error = namei(&nd)) != 0) 930 return (error); 931 vp = nd.ni_vp; 932 if (vp != NULL) 933 error = EEXIST; 934 else { 935 VATTR_NULL(&vattr); 936 vattr.va_mode = 937 (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 938 vattr.va_rdev = SCARG(uap, dev); 939 whiteout = 0; 940 941 switch (SCARG(uap, mode) & S_IFMT) { 942 case S_IFMT: /* used by badsect to flag bad sectors */ 943 vattr.va_type = VBAD; 944 break; 945 case S_IFCHR: 946 vattr.va_type = VCHR; 947 break; 948 case S_IFBLK: 949 vattr.va_type = VBLK; 950 break; 951 case S_IFWHT: 952 whiteout = 1; 953 break; 954 default: 955 error = EINVAL; 956 break; 957 } 958 } 959 if (!error) { 960 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 961 if (whiteout) { 962 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 963 if (error) 964 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 965 vput(nd.ni_dvp); 966 } else { 967 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 968 &nd.ni_cnd, &vattr); 969 } 970 } else { 971 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 972 if (nd.ni_dvp == vp) 973 vrele(nd.ni_dvp); 974 else 975 vput(nd.ni_dvp); 976 if (vp) 977 vrele(vp); 978 } 979 return (error); 980 } 981 982 /* 983 * Create a named pipe. 984 */ 985 /* ARGSUSED */ 986 int 987 sys_mkfifo(p, v, retval) 988 struct proc *p; 989 void *v; 990 register_t *retval; 991 { 992 register struct sys_mkfifo_args /* { 993 syscallarg(const char *) path; 994 syscallarg(int) mode; 995 } */ *uap = v; 996 struct vattr vattr; 997 int error; 998 struct nameidata nd; 999 1000 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1001 if ((error = namei(&nd)) != 0) 1002 return (error); 1003 if (nd.ni_vp != NULL) { 1004 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1005 if (nd.ni_dvp == nd.ni_vp) 1006 vrele(nd.ni_dvp); 1007 else 1008 vput(nd.ni_dvp); 1009 vrele(nd.ni_vp); 1010 return (EEXIST); 1011 } 1012 VATTR_NULL(&vattr); 1013 vattr.va_type = VFIFO; 1014 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 1015 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1016 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1017 } 1018 1019 /* 1020 * Make a hard file link. 1021 */ 1022 /* ARGSUSED */ 1023 int 1024 sys_link(p, v, retval) 1025 struct proc *p; 1026 void *v; 1027 register_t *retval; 1028 { 1029 register struct sys_link_args /* { 1030 syscallarg(const char *) path; 1031 syscallarg(const char *) link; 1032 } */ *uap = v; 1033 register struct vnode *vp; 1034 struct nameidata nd; 1035 int error; 1036 1037 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1038 if ((error = namei(&nd)) != 0) 1039 return (error); 1040 vp = nd.ni_vp; 1041 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1042 if ((error = namei(&nd)) != 0) 1043 goto out; 1044 if (nd.ni_vp) { 1045 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1046 if (nd.ni_dvp == nd.ni_vp) 1047 vrele(nd.ni_dvp); 1048 else 1049 vput(nd.ni_dvp); 1050 vrele(nd.ni_vp); 1051 error = EEXIST; 1052 goto out; 1053 } 1054 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1055 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1056 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1057 out: 1058 vrele(vp); 1059 return (error); 1060 } 1061 1062 /* 1063 * Make a symbolic link. 1064 */ 1065 /* ARGSUSED */ 1066 int 1067 sys_symlink(p, v, retval) 1068 struct proc *p; 1069 void *v; 1070 register_t *retval; 1071 { 1072 register struct sys_symlink_args /* { 1073 syscallarg(const char *) path; 1074 syscallarg(const char *) link; 1075 } */ *uap = v; 1076 struct vattr vattr; 1077 char *path; 1078 int error; 1079 struct nameidata nd; 1080 1081 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1082 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1083 if (error) 1084 goto out; 1085 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1086 if ((error = namei(&nd)) != 0) 1087 goto out; 1088 if (nd.ni_vp) { 1089 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1090 if (nd.ni_dvp == nd.ni_vp) 1091 vrele(nd.ni_dvp); 1092 else 1093 vput(nd.ni_dvp); 1094 vrele(nd.ni_vp); 1095 error = EEXIST; 1096 goto out; 1097 } 1098 VATTR_NULL(&vattr); 1099 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1100 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1101 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1102 out: 1103 FREE(path, M_NAMEI); 1104 return (error); 1105 } 1106 1107 /* 1108 * Delete a whiteout from the filesystem. 1109 */ 1110 /* ARGSUSED */ 1111 int 1112 sys_undelete(p, v, retval) 1113 struct proc *p; 1114 void *v; 1115 register_t *retval; 1116 { 1117 register struct sys_undelete_args /* { 1118 syscallarg(const char *) path; 1119 } */ *uap = v; 1120 int error; 1121 struct nameidata nd; 1122 1123 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1124 SCARG(uap, path), p); 1125 error = namei(&nd); 1126 if (error) 1127 return (error); 1128 1129 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1130 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1131 if (nd.ni_dvp == nd.ni_vp) 1132 vrele(nd.ni_dvp); 1133 else 1134 vput(nd.ni_dvp); 1135 if (nd.ni_vp) 1136 vrele(nd.ni_vp); 1137 return (EEXIST); 1138 } 1139 1140 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1141 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1142 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1143 vput(nd.ni_dvp); 1144 return (error); 1145 } 1146 1147 /* 1148 * Delete a name from the filesystem. 1149 */ 1150 /* ARGSUSED */ 1151 int 1152 sys_unlink(p, v, retval) 1153 struct proc *p; 1154 void *v; 1155 register_t *retval; 1156 { 1157 struct sys_unlink_args /* { 1158 syscallarg(const char *) path; 1159 } */ *uap = v; 1160 register struct vnode *vp; 1161 int error; 1162 struct nameidata nd; 1163 1164 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1165 SCARG(uap, path), p); 1166 if ((error = namei(&nd)) != 0) 1167 return (error); 1168 vp = nd.ni_vp; 1169 1170 /* 1171 * The root of a mounted filesystem cannot be deleted. 1172 */ 1173 if (vp->v_flag & VROOT) { 1174 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1175 if (nd.ni_dvp == vp) 1176 vrele(nd.ni_dvp); 1177 else 1178 vput(nd.ni_dvp); 1179 vput(vp); 1180 error = EBUSY; 1181 goto out; 1182 } 1183 1184 #if defined(UVM) 1185 (void)uvm_vnp_uncache(vp); 1186 #else 1187 (void)vnode_pager_uncache(vp); 1188 #endif 1189 1190 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1191 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1192 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1193 out: 1194 return (error); 1195 } 1196 1197 /* 1198 * Reposition read/write file offset. 1199 */ 1200 int 1201 sys_lseek(p, v, retval) 1202 struct proc *p; 1203 void *v; 1204 register_t *retval; 1205 { 1206 register struct sys_lseek_args /* { 1207 syscallarg(int) fd; 1208 syscallarg(int) pad; 1209 syscallarg(off_t) offset; 1210 syscallarg(int) whence; 1211 } */ *uap = v; 1212 struct ucred *cred = p->p_ucred; 1213 register struct filedesc *fdp = p->p_fd; 1214 register struct file *fp; 1215 struct vnode *vp; 1216 struct vattr vattr; 1217 register off_t newoff; 1218 int error; 1219 1220 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1221 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1222 return (EBADF); 1223 1224 vp = (struct vnode *)fp->f_data; 1225 if (fp->f_type != DTYPE_VNODE 1226 || vp->v_type == VFIFO) 1227 return (ESPIPE); 1228 1229 switch (SCARG(uap, whence)) { 1230 case SEEK_CUR: 1231 newoff = fp->f_offset + SCARG(uap, offset); 1232 break; 1233 case SEEK_END: 1234 error = VOP_GETATTR(vp, &vattr, cred, p); 1235 if (error) 1236 return (error); 1237 newoff = SCARG(uap, offset) + vattr.va_size; 1238 break; 1239 case SEEK_SET: 1240 newoff = SCARG(uap, offset); 1241 break; 1242 default: 1243 return (EINVAL); 1244 } 1245 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1246 return (error); 1247 1248 *(off_t *)retval = fp->f_offset = newoff; 1249 return (0); 1250 } 1251 1252 /* 1253 * Positional read system call. 1254 */ 1255 int 1256 sys_pread(p, v, retval) 1257 struct proc *p; 1258 void *v; 1259 register_t *retval; 1260 { 1261 struct sys_pread_args /* { 1262 syscallarg(int) fd; 1263 syscallarg(void *) buf; 1264 syscallarg(size_t) nbyte; 1265 syscallarg(off_t) offset; 1266 } */ *uap = v; 1267 struct filedesc *fdp = p->p_fd; 1268 struct file *fp; 1269 struct vnode *vp; 1270 off_t offset; 1271 int error, fd = SCARG(uap, fd); 1272 1273 if ((u_int)fd >= fdp->fd_nfiles || 1274 (fp = fdp->fd_ofiles[fd]) == NULL || 1275 (fp->f_flag & FREAD) == 0) 1276 return (EBADF); 1277 1278 vp = (struct vnode *)fp->f_data; 1279 if (fp->f_type != DTYPE_VNODE 1280 || vp->v_type == VFIFO) 1281 return (ESPIPE); 1282 1283 offset = SCARG(uap, offset); 1284 1285 /* 1286 * XXX This works because no file systems actually 1287 * XXX take any action on the seek operation. 1288 */ 1289 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1290 return (error); 1291 1292 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1293 &offset, 0, retval)); 1294 } 1295 1296 /* 1297 * Positional scatter read system call. 1298 */ 1299 int 1300 sys_preadv(p, v, retval) 1301 struct proc *p; 1302 void *v; 1303 register_t *retval; 1304 { 1305 struct sys_preadv_args /* { 1306 syscallarg(int) fd; 1307 syscallarg(const struct iovec *) iovp; 1308 syscallarg(int) iovcnt; 1309 syscallarg(off_t) offset; 1310 } */ *uap = v; 1311 struct filedesc *fdp = p->p_fd; 1312 struct file *fp; 1313 struct vnode *vp; 1314 off_t offset; 1315 int error, fd = SCARG(uap, fd); 1316 1317 if ((u_int)fd >= fdp->fd_nfiles || 1318 (fp = fdp->fd_ofiles[fd]) == NULL || 1319 (fp->f_flag & FREAD) == 0) 1320 return (EBADF); 1321 1322 vp = (struct vnode *)fp->f_data; 1323 if (fp->f_type != DTYPE_VNODE 1324 || vp->v_type == VFIFO) 1325 return (ESPIPE); 1326 1327 offset = SCARG(uap, offset); 1328 1329 /* 1330 * XXX This works because no file systems actually 1331 * XXX take any action on the seek operation. 1332 */ 1333 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1334 return (error); 1335 1336 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1337 &offset, 0, retval)); 1338 } 1339 1340 /* 1341 * Positional write system call. 1342 */ 1343 int 1344 sys_pwrite(p, v, retval) 1345 struct proc *p; 1346 void *v; 1347 register_t *retval; 1348 { 1349 struct sys_pwrite_args /* { 1350 syscallarg(int) fd; 1351 syscallarg(const void *) buf; 1352 syscallarg(size_t) nbyte; 1353 syscallarg(off_t) offset; 1354 } */ *uap = v; 1355 struct filedesc *fdp = p->p_fd; 1356 struct file *fp; 1357 struct vnode *vp; 1358 off_t offset; 1359 int error, fd = SCARG(uap, fd); 1360 1361 if ((u_int)fd >= fdp->fd_nfiles || 1362 (fp = fdp->fd_ofiles[fd]) == NULL || 1363 (fp->f_flag & FWRITE) == 0) 1364 return (EBADF); 1365 1366 vp = (struct vnode *)fp->f_data; 1367 if (fp->f_type != DTYPE_VNODE 1368 || vp->v_type == VFIFO) 1369 return (ESPIPE); 1370 1371 offset = SCARG(uap, offset); 1372 1373 /* 1374 * XXX This works because no file systems actually 1375 * XXX take any action on the seek operation. 1376 */ 1377 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1378 return (error); 1379 1380 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1381 &offset, 0, retval)); 1382 } 1383 1384 /* 1385 * Positional gather write system call. 1386 */ 1387 int 1388 sys_pwritev(p, v, retval) 1389 struct proc *p; 1390 void *v; 1391 register_t *retval; 1392 { 1393 struct sys_pwritev_args /* { 1394 syscallarg(int) fd; 1395 syscallarg(const struct iovec *) iovp; 1396 syscallarg(int) iovcnt; 1397 syscallarg(off_t) offset; 1398 } */ *uap = v; 1399 struct filedesc *fdp = p->p_fd; 1400 struct file *fp; 1401 struct vnode *vp; 1402 off_t offset; 1403 int error, fd = SCARG(uap, fd); 1404 1405 if ((u_int)fd >= fdp->fd_nfiles || 1406 (fp = fdp->fd_ofiles[fd]) == NULL || 1407 (fp->f_flag & FWRITE) == 0) 1408 return (EBADF); 1409 1410 vp = (struct vnode *)fp->f_data; 1411 if (fp->f_type != DTYPE_VNODE 1412 || vp->v_type == VFIFO) 1413 return (ESPIPE); 1414 1415 offset = SCARG(uap, offset); 1416 1417 /* 1418 * XXX This works because no file systems actually 1419 * XXX take any action on the seek operation. 1420 */ 1421 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1422 return (error); 1423 1424 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1425 &offset, 0, retval)); 1426 } 1427 1428 /* 1429 * Check access permissions. 1430 */ 1431 int 1432 sys_access(p, v, retval) 1433 struct proc *p; 1434 void *v; 1435 register_t *retval; 1436 { 1437 register struct sys_access_args /* { 1438 syscallarg(const char *) path; 1439 syscallarg(int) flags; 1440 } */ *uap = v; 1441 register struct ucred *cred = p->p_ucred; 1442 register struct vnode *vp; 1443 int error, flags, t_gid, t_uid; 1444 struct nameidata nd; 1445 1446 t_uid = cred->cr_uid; 1447 t_gid = cred->cr_gid; 1448 cred->cr_uid = p->p_cred->p_ruid; 1449 cred->cr_gid = p->p_cred->p_rgid; 1450 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1451 SCARG(uap, path), p); 1452 if ((error = namei(&nd)) != 0) 1453 goto out1; 1454 vp = nd.ni_vp; 1455 1456 /* Flags == 0 means only check for existence. */ 1457 if (SCARG(uap, flags)) { 1458 flags = 0; 1459 if (SCARG(uap, flags) & R_OK) 1460 flags |= VREAD; 1461 if (SCARG(uap, flags) & W_OK) 1462 flags |= VWRITE; 1463 if (SCARG(uap, flags) & X_OK) 1464 flags |= VEXEC; 1465 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1466 error = VOP_ACCESS(vp, flags, cred, p); 1467 } 1468 vput(vp); 1469 out1: 1470 cred->cr_uid = t_uid; 1471 cred->cr_gid = t_gid; 1472 return (error); 1473 } 1474 1475 /* 1476 * Get file status; this version follows links. 1477 */ 1478 /* ARGSUSED */ 1479 int 1480 sys___stat13(p, v, retval) 1481 struct proc *p; 1482 void *v; 1483 register_t *retval; 1484 { 1485 register struct sys___stat13_args /* { 1486 syscallarg(const char *) path; 1487 syscallarg(struct stat *) ub; 1488 } */ *uap = v; 1489 struct stat sb; 1490 int error; 1491 struct nameidata nd; 1492 1493 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1494 SCARG(uap, path), p); 1495 if ((error = namei(&nd)) != 0) 1496 return (error); 1497 error = vn_stat(nd.ni_vp, &sb, p); 1498 vput(nd.ni_vp); 1499 if (error) 1500 return (error); 1501 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1502 return (error); 1503 } 1504 1505 /* 1506 * Get file status; this version does not follow links. 1507 */ 1508 /* ARGSUSED */ 1509 int 1510 sys___lstat13(p, v, retval) 1511 struct proc *p; 1512 void *v; 1513 register_t *retval; 1514 { 1515 register struct sys___lstat13_args /* { 1516 syscallarg(const char *) path; 1517 syscallarg(struct stat *) ub; 1518 } */ *uap = v; 1519 struct stat sb; 1520 int error; 1521 struct nameidata nd; 1522 1523 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1524 SCARG(uap, path), p); 1525 if ((error = namei(&nd)) != 0) 1526 return (error); 1527 error = vn_stat(nd.ni_vp, &sb, p); 1528 vput(nd.ni_vp); 1529 if (error) 1530 return (error); 1531 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1532 return (error); 1533 } 1534 1535 /* 1536 * Get configurable pathname variables. 1537 */ 1538 /* ARGSUSED */ 1539 int 1540 sys_pathconf(p, v, retval) 1541 struct proc *p; 1542 void *v; 1543 register_t *retval; 1544 { 1545 register struct sys_pathconf_args /* { 1546 syscallarg(const char *) path; 1547 syscallarg(int) name; 1548 } */ *uap = v; 1549 int error; 1550 struct nameidata nd; 1551 1552 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1553 SCARG(uap, path), p); 1554 if ((error = namei(&nd)) != 0) 1555 return (error); 1556 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1557 vput(nd.ni_vp); 1558 return (error); 1559 } 1560 1561 /* 1562 * Return target name of a symbolic link. 1563 */ 1564 /* ARGSUSED */ 1565 int 1566 sys_readlink(p, v, retval) 1567 struct proc *p; 1568 void *v; 1569 register_t *retval; 1570 { 1571 register struct sys_readlink_args /* { 1572 syscallarg(const char *) path; 1573 syscallarg(char *) buf; 1574 syscallarg(size_t) count; 1575 } */ *uap = v; 1576 register struct vnode *vp; 1577 struct iovec aiov; 1578 struct uio auio; 1579 int error; 1580 struct nameidata nd; 1581 1582 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1583 SCARG(uap, path), p); 1584 if ((error = namei(&nd)) != 0) 1585 return (error); 1586 vp = nd.ni_vp; 1587 if (vp->v_type != VLNK) 1588 error = EINVAL; 1589 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1590 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1591 aiov.iov_base = SCARG(uap, buf); 1592 aiov.iov_len = SCARG(uap, count); 1593 auio.uio_iov = &aiov; 1594 auio.uio_iovcnt = 1; 1595 auio.uio_offset = 0; 1596 auio.uio_rw = UIO_READ; 1597 auio.uio_segflg = UIO_USERSPACE; 1598 auio.uio_procp = p; 1599 auio.uio_resid = SCARG(uap, count); 1600 error = VOP_READLINK(vp, &auio, p->p_ucred); 1601 } 1602 vput(vp); 1603 *retval = SCARG(uap, count) - auio.uio_resid; 1604 return (error); 1605 } 1606 1607 /* 1608 * Change flags of a file given a path name. 1609 */ 1610 /* ARGSUSED */ 1611 int 1612 sys_chflags(p, v, retval) 1613 struct proc *p; 1614 void *v; 1615 register_t *retval; 1616 { 1617 register struct sys_chflags_args /* { 1618 syscallarg(const char *) path; 1619 syscallarg(u_long) flags; 1620 } */ *uap = v; 1621 register struct vnode *vp; 1622 struct vattr vattr; 1623 int error; 1624 struct nameidata nd; 1625 1626 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1627 if ((error = namei(&nd)) != 0) 1628 return (error); 1629 vp = nd.ni_vp; 1630 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1631 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1632 VATTR_NULL(&vattr); 1633 vattr.va_flags = SCARG(uap, flags); 1634 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1635 vput(vp); 1636 return (error); 1637 } 1638 1639 /* 1640 * Change flags of a file given a file descriptor. 1641 */ 1642 /* ARGSUSED */ 1643 int 1644 sys_fchflags(p, v, retval) 1645 struct proc *p; 1646 void *v; 1647 register_t *retval; 1648 { 1649 register struct sys_fchflags_args /* { 1650 syscallarg(int) fd; 1651 syscallarg(u_long) flags; 1652 } */ *uap = v; 1653 struct vattr vattr; 1654 struct vnode *vp; 1655 struct file *fp; 1656 int error; 1657 1658 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1659 return (error); 1660 vp = (struct vnode *)fp->f_data; 1661 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1662 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1663 VATTR_NULL(&vattr); 1664 vattr.va_flags = SCARG(uap, flags); 1665 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1666 VOP_UNLOCK(vp, 0); 1667 return (error); 1668 } 1669 1670 /* 1671 * Change mode of a file given path name; this version follows links. 1672 */ 1673 /* ARGSUSED */ 1674 int 1675 sys_chmod(p, v, retval) 1676 struct proc *p; 1677 void *v; 1678 register_t *retval; 1679 { 1680 register struct sys_chmod_args /* { 1681 syscallarg(const char *) path; 1682 syscallarg(int) mode; 1683 } */ *uap = v; 1684 int error; 1685 struct nameidata nd; 1686 1687 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1688 if ((error = namei(&nd)) != 0) 1689 return (error); 1690 1691 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1692 1693 vrele(nd.ni_vp); 1694 return (error); 1695 } 1696 1697 /* 1698 * Change mode of a file given a file descriptor. 1699 */ 1700 /* ARGSUSED */ 1701 int 1702 sys_fchmod(p, v, retval) 1703 struct proc *p; 1704 void *v; 1705 register_t *retval; 1706 { 1707 register struct sys_fchmod_args /* { 1708 syscallarg(int) fd; 1709 syscallarg(int) mode; 1710 } */ *uap = v; 1711 struct file *fp; 1712 int error; 1713 1714 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1715 return (error); 1716 1717 return (change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p)); 1718 } 1719 1720 /* 1721 * Change mode of a file given path name; this version does not follow links. 1722 */ 1723 /* ARGSUSED */ 1724 int 1725 sys_lchmod(p, v, retval) 1726 struct proc *p; 1727 void *v; 1728 register_t *retval; 1729 { 1730 register struct sys_lchmod_args /* { 1731 syscallarg(const char *) path; 1732 syscallarg(int) mode; 1733 } */ *uap = v; 1734 int error; 1735 struct nameidata nd; 1736 1737 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1738 if ((error = namei(&nd)) != 0) 1739 return (error); 1740 1741 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1742 1743 vrele(nd.ni_vp); 1744 return (error); 1745 } 1746 1747 /* 1748 * Common routine to set mode given a vnode. 1749 */ 1750 static int 1751 change_mode(vp, mode, p) 1752 struct vnode *vp; 1753 int mode; 1754 struct proc *p; 1755 { 1756 struct vattr vattr; 1757 int error; 1758 1759 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1760 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1761 VATTR_NULL(&vattr); 1762 vattr.va_mode = mode & ALLPERMS; 1763 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1764 VOP_UNLOCK(vp, 0); 1765 return (error); 1766 } 1767 1768 /* 1769 * Set ownership given a path name; this version follows links. 1770 */ 1771 /* ARGSUSED */ 1772 int 1773 sys_chown(p, v, retval) 1774 struct proc *p; 1775 void *v; 1776 register_t *retval; 1777 { 1778 register struct sys_chown_args /* { 1779 syscallarg(const char *) path; 1780 syscallarg(uid_t) uid; 1781 syscallarg(gid_t) gid; 1782 } */ *uap = v; 1783 int error; 1784 struct nameidata nd; 1785 1786 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1787 if ((error = namei(&nd)) != 0) 1788 return (error); 1789 1790 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1791 1792 vrele(nd.ni_vp); 1793 return (error); 1794 } 1795 1796 /* 1797 * Set ownership given a path name; this version follows links. 1798 * Provides POSIX semantics. 1799 */ 1800 /* ARGSUSED */ 1801 int 1802 sys___posix_chown(p, v, retval) 1803 struct proc *p; 1804 void *v; 1805 register_t *retval; 1806 { 1807 register struct sys_chown_args /* { 1808 syscallarg(const char *) path; 1809 syscallarg(uid_t) uid; 1810 syscallarg(gid_t) gid; 1811 } */ *uap = v; 1812 int error; 1813 struct nameidata nd; 1814 1815 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1816 if ((error = namei(&nd)) != 0) 1817 return (error); 1818 1819 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 1820 1821 vrele(nd.ni_vp); 1822 return (error); 1823 } 1824 1825 /* 1826 * Set ownership given a file descriptor. 1827 */ 1828 /* ARGSUSED */ 1829 int 1830 sys_fchown(p, v, retval) 1831 struct proc *p; 1832 void *v; 1833 register_t *retval; 1834 { 1835 register struct sys_fchown_args /* { 1836 syscallarg(int) fd; 1837 syscallarg(uid_t) uid; 1838 syscallarg(gid_t) gid; 1839 } */ *uap = v; 1840 int error; 1841 struct file *fp; 1842 1843 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1844 return (error); 1845 1846 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1847 SCARG(uap, gid), p, 0)); 1848 } 1849 1850 /* 1851 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 1852 */ 1853 /* ARGSUSED */ 1854 int 1855 sys___posix_fchown(p, v, retval) 1856 struct proc *p; 1857 void *v; 1858 register_t *retval; 1859 { 1860 register struct sys_fchown_args /* { 1861 syscallarg(int) fd; 1862 syscallarg(uid_t) uid; 1863 syscallarg(gid_t) gid; 1864 } */ *uap = v; 1865 int error; 1866 struct file *fp; 1867 1868 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1869 return (error); 1870 1871 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1872 SCARG(uap, gid), p, 1)); 1873 } 1874 1875 /* 1876 * Set ownership given a path name; this version does not follow links. 1877 */ 1878 /* ARGSUSED */ 1879 int 1880 sys_lchown(p, v, retval) 1881 struct proc *p; 1882 void *v; 1883 register_t *retval; 1884 { 1885 register struct sys_lchown_args /* { 1886 syscallarg(const char *) path; 1887 syscallarg(uid_t) uid; 1888 syscallarg(gid_t) gid; 1889 } */ *uap = v; 1890 int error; 1891 struct nameidata nd; 1892 1893 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1894 if ((error = namei(&nd)) != 0) 1895 return (error); 1896 1897 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1898 1899 vrele(nd.ni_vp); 1900 return (error); 1901 } 1902 1903 /* 1904 * Set ownership given a path name; this version does not follow links. 1905 * Provides POSIX/XPG semantics. 1906 */ 1907 /* ARGSUSED */ 1908 int 1909 sys___posix_lchown(p, v, retval) 1910 struct proc *p; 1911 void *v; 1912 register_t *retval; 1913 { 1914 register struct sys_lchown_args /* { 1915 syscallarg(const char *) path; 1916 syscallarg(uid_t) uid; 1917 syscallarg(gid_t) gid; 1918 } */ *uap = v; 1919 int error; 1920 struct nameidata nd; 1921 1922 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1923 if ((error = namei(&nd)) != 0) 1924 return (error); 1925 1926 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 1927 1928 vrele(nd.ni_vp); 1929 return (error); 1930 } 1931 1932 /* 1933 * Common routine to set ownership given a vnode. 1934 */ 1935 static int 1936 change_owner(vp, uid, gid, p, posix_semantics) 1937 register struct vnode *vp; 1938 uid_t uid; 1939 gid_t gid; 1940 struct proc *p; 1941 int posix_semantics; 1942 { 1943 struct vattr vattr; 1944 mode_t newmode; 1945 int error; 1946 1947 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1948 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1949 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 1950 goto out; 1951 1952 #define CHANGED(x) ((x) != -1) 1953 newmode = vattr.va_mode; 1954 if (posix_semantics) { 1955 /* 1956 * POSIX/XPG semantics: if the caller is not the super-user, 1957 * clear set-user-id and set-group-id bits. Both POSIX and 1958 * the XPG consider the behaviour for calls by the super-user 1959 * implementation-defined; we leave the set-user-id and set- 1960 * group-id settings intact in that case. 1961 */ 1962 if (suser(p->p_ucred, NULL) != 0) 1963 newmode &= ~(S_ISUID | S_ISGID); 1964 } else { 1965 /* 1966 * NetBSD semantics: when changing owner and/or group, 1967 * clear the respective bit(s). 1968 */ 1969 if (CHANGED(uid)) 1970 newmode &= ~S_ISUID; 1971 if (CHANGED(gid)) 1972 newmode &= ~S_ISGID; 1973 } 1974 /* Update va_mode iff altered. */ 1975 if (vattr.va_mode == newmode) 1976 newmode = VNOVAL; 1977 1978 VATTR_NULL(&vattr); 1979 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 1980 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 1981 vattr.va_mode = newmode; 1982 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1983 #undef CHANGED 1984 1985 out: 1986 VOP_UNLOCK(vp, 0); 1987 return (error); 1988 } 1989 1990 /* 1991 * Set the access and modification times given a path name; this 1992 * version follows links. 1993 */ 1994 /* ARGSUSED */ 1995 int 1996 sys_utimes(p, v, retval) 1997 struct proc *p; 1998 void *v; 1999 register_t *retval; 2000 { 2001 register struct sys_utimes_args /* { 2002 syscallarg(const char *) path; 2003 syscallarg(const struct timeval *) tptr; 2004 } */ *uap = v; 2005 int error; 2006 struct nameidata nd; 2007 2008 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2009 if ((error = namei(&nd)) != 0) 2010 return (error); 2011 2012 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2013 2014 vrele(nd.ni_vp); 2015 return (error); 2016 } 2017 2018 /* 2019 * Set the access and modification times given a file descriptor. 2020 */ 2021 /* ARGSUSED */ 2022 int 2023 sys_futimes(p, v, retval) 2024 struct proc *p; 2025 void *v; 2026 register_t *retval; 2027 { 2028 register struct sys_futimes_args /* { 2029 syscallarg(int) fd; 2030 syscallarg(const struct timeval *) tptr; 2031 } */ *uap = v; 2032 int error; 2033 struct file *fp; 2034 2035 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2036 return (error); 2037 2038 return (change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), 2039 p)); 2040 } 2041 2042 /* 2043 * Set the access and modification times given a path name; this 2044 * version does not follow links. 2045 */ 2046 /* ARGSUSED */ 2047 int 2048 sys_lutimes(p, v, retval) 2049 struct proc *p; 2050 void *v; 2051 register_t *retval; 2052 { 2053 register struct sys_lutimes_args /* { 2054 syscallarg(const char *) path; 2055 syscallarg(const struct timeval *) tptr; 2056 } */ *uap = v; 2057 int error; 2058 struct nameidata nd; 2059 2060 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2061 if ((error = namei(&nd)) != 0) 2062 return (error); 2063 2064 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2065 2066 vrele(nd.ni_vp); 2067 return (error); 2068 } 2069 2070 /* 2071 * Common routine to set access and modification times given a vnode. 2072 */ 2073 static int 2074 change_utimes(vp, tptr, p) 2075 struct vnode *vp; 2076 const struct timeval *tptr; 2077 struct proc *p; 2078 { 2079 struct timeval tv[2]; 2080 struct vattr vattr; 2081 int error; 2082 2083 VATTR_NULL(&vattr); 2084 if (tptr == NULL) { 2085 microtime(&tv[0]); 2086 tv[1] = tv[0]; 2087 vattr.va_vaflags |= VA_UTIMES_NULL; 2088 } else { 2089 error = copyin(tptr, tv, sizeof(tv)); 2090 if (error) 2091 return (error); 2092 } 2093 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2094 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2095 vattr.va_atime.tv_sec = tv[0].tv_sec; 2096 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2097 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2098 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2099 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2100 VOP_UNLOCK(vp, 0); 2101 return (error); 2102 } 2103 2104 /* 2105 * Truncate a file given its path name. 2106 */ 2107 /* ARGSUSED */ 2108 int 2109 sys_truncate(p, v, retval) 2110 struct proc *p; 2111 void *v; 2112 register_t *retval; 2113 { 2114 register struct sys_truncate_args /* { 2115 syscallarg(const char *) path; 2116 syscallarg(int) pad; 2117 syscallarg(off_t) length; 2118 } */ *uap = v; 2119 register struct vnode *vp; 2120 struct vattr vattr; 2121 int error; 2122 struct nameidata nd; 2123 2124 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2125 if ((error = namei(&nd)) != 0) 2126 return (error); 2127 vp = nd.ni_vp; 2128 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2129 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2130 if (vp->v_type == VDIR) 2131 error = EISDIR; 2132 else if ((error = vn_writechk(vp)) == 0 && 2133 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2134 VATTR_NULL(&vattr); 2135 vattr.va_size = SCARG(uap, length); 2136 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2137 } 2138 vput(vp); 2139 return (error); 2140 } 2141 2142 /* 2143 * Truncate a file given a file descriptor. 2144 */ 2145 /* ARGSUSED */ 2146 int 2147 sys_ftruncate(p, v, retval) 2148 struct proc *p; 2149 void *v; 2150 register_t *retval; 2151 { 2152 register struct sys_ftruncate_args /* { 2153 syscallarg(int) fd; 2154 syscallarg(int) pad; 2155 syscallarg(off_t) length; 2156 } */ *uap = v; 2157 struct vattr vattr; 2158 struct vnode *vp; 2159 struct file *fp; 2160 int error; 2161 2162 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2163 return (error); 2164 if ((fp->f_flag & FWRITE) == 0) 2165 return (EINVAL); 2166 vp = (struct vnode *)fp->f_data; 2167 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2168 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2169 if (vp->v_type == VDIR) 2170 error = EISDIR; 2171 else if ((error = vn_writechk(vp)) == 0) { 2172 VATTR_NULL(&vattr); 2173 vattr.va_size = SCARG(uap, length); 2174 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2175 } 2176 VOP_UNLOCK(vp, 0); 2177 return (error); 2178 } 2179 2180 /* 2181 * Sync an open file. 2182 */ 2183 /* ARGSUSED */ 2184 int 2185 sys_fsync(p, v, retval) 2186 struct proc *p; 2187 void *v; 2188 register_t *retval; 2189 { 2190 struct sys_fsync_args /* { 2191 syscallarg(int) fd; 2192 } */ *uap = v; 2193 register struct vnode *vp; 2194 struct file *fp; 2195 int error; 2196 2197 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2198 return (error); 2199 vp = (struct vnode *)fp->f_data; 2200 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2201 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2202 VOP_UNLOCK(vp, 0); 2203 return (error); 2204 } 2205 2206 /* 2207 * Sync the data of an open file. 2208 */ 2209 /* ARGSUSED */ 2210 int 2211 sys_fdatasync(p, v, retval) 2212 struct proc *p; 2213 void *v; 2214 register_t *retval; 2215 { 2216 struct sys_fdatasync_args /* { 2217 syscallarg(int) fd; 2218 } */ *uap = v; 2219 struct vnode *vp; 2220 struct file *fp; 2221 int error; 2222 2223 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2224 return (error); 2225 vp = (struct vnode *)fp->f_data; 2226 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2227 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2228 VOP_UNLOCK(vp, 0); 2229 return (error); 2230 } 2231 2232 /* 2233 * Rename files, (standard) BSD semantics frontend. 2234 */ 2235 /* ARGSUSED */ 2236 int 2237 sys_rename(p, v, retval) 2238 struct proc *p; 2239 void *v; 2240 register_t *retval; 2241 { 2242 register struct sys_rename_args /* { 2243 syscallarg(const char *) from; 2244 syscallarg(const char *) to; 2245 } */ *uap = v; 2246 2247 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2248 } 2249 2250 /* 2251 * Rename files, POSIX semantics frontend. 2252 */ 2253 /* ARGSUSED */ 2254 int 2255 sys___posix_rename(p, v, retval) 2256 struct proc *p; 2257 void *v; 2258 register_t *retval; 2259 { 2260 register struct sys___posix_rename_args /* { 2261 syscallarg(const char *) from; 2262 syscallarg(const char *) to; 2263 } */ *uap = v; 2264 2265 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2266 } 2267 2268 /* 2269 * Rename files. Source and destination must either both be directories, 2270 * or both not be directories. If target is a directory, it must be empty. 2271 * If `from' and `to' refer to the same object, the value of the `retain' 2272 * argument is used to determine whether `from' will be 2273 * 2274 * (retain == 0) deleted unless `from' and `to' refer to the same 2275 * object in the file system's name space (BSD). 2276 * (retain == 1) always retained (POSIX). 2277 */ 2278 static int 2279 rename_files(from, to, p, retain) 2280 const char *from, *to; 2281 struct proc *p; 2282 int retain; 2283 { 2284 register struct vnode *tvp, *fvp, *tdvp; 2285 struct nameidata fromnd, tond; 2286 int error; 2287 2288 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2289 from, p); 2290 if ((error = namei(&fromnd)) != 0) 2291 return (error); 2292 fvp = fromnd.ni_vp; 2293 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2294 UIO_USERSPACE, to, p); 2295 if ((error = namei(&tond)) != 0) { 2296 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2297 vrele(fromnd.ni_dvp); 2298 vrele(fvp); 2299 goto out1; 2300 } 2301 tdvp = tond.ni_dvp; 2302 tvp = tond.ni_vp; 2303 2304 if (tvp != NULL) { 2305 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2306 error = ENOTDIR; 2307 goto out; 2308 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2309 error = EISDIR; 2310 goto out; 2311 } 2312 } 2313 2314 if (fvp == tdvp) 2315 error = EINVAL; 2316 2317 /* 2318 * Source and destination refer to the same object. 2319 */ 2320 if (fvp == tvp) { 2321 if (retain) 2322 error = -1; 2323 else if (fromnd.ni_dvp == tdvp && 2324 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2325 !memcmp(fromnd.ni_cnd.cn_nameptr, 2326 tond.ni_cnd.cn_nameptr, 2327 fromnd.ni_cnd.cn_namelen)) 2328 error = -1; 2329 } 2330 2331 out: 2332 if (!error) { 2333 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2334 if (fromnd.ni_dvp != tdvp) 2335 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2336 if (tvp) { 2337 #if defined(UVM) 2338 (void)uvm_vnp_uncache(tvp); 2339 #else 2340 (void)vnode_pager_uncache(tvp); 2341 #endif 2342 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2343 } 2344 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2345 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2346 } else { 2347 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2348 if (tdvp == tvp) 2349 vrele(tdvp); 2350 else 2351 vput(tdvp); 2352 if (tvp) 2353 vput(tvp); 2354 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2355 vrele(fromnd.ni_dvp); 2356 vrele(fvp); 2357 } 2358 vrele(tond.ni_startdir); 2359 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2360 out1: 2361 if (fromnd.ni_startdir) 2362 vrele(fromnd.ni_startdir); 2363 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2364 return (error == -1 ? 0 : error); 2365 } 2366 2367 /* 2368 * Make a directory file. 2369 */ 2370 /* ARGSUSED */ 2371 int 2372 sys_mkdir(p, v, retval) 2373 struct proc *p; 2374 void *v; 2375 register_t *retval; 2376 { 2377 register struct sys_mkdir_args /* { 2378 syscallarg(const char *) path; 2379 syscallarg(int) mode; 2380 } */ *uap = v; 2381 register struct vnode *vp; 2382 struct vattr vattr; 2383 int error; 2384 struct nameidata nd; 2385 2386 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2387 if ((error = namei(&nd)) != 0) 2388 return (error); 2389 vp = nd.ni_vp; 2390 if (vp != NULL) { 2391 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2392 if (nd.ni_dvp == vp) 2393 vrele(nd.ni_dvp); 2394 else 2395 vput(nd.ni_dvp); 2396 vrele(vp); 2397 return (EEXIST); 2398 } 2399 VATTR_NULL(&vattr); 2400 vattr.va_type = VDIR; 2401 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 2402 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2403 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2404 if (!error) 2405 vput(nd.ni_vp); 2406 return (error); 2407 } 2408 2409 /* 2410 * Remove a directory file. 2411 */ 2412 /* ARGSUSED */ 2413 int 2414 sys_rmdir(p, v, retval) 2415 struct proc *p; 2416 void *v; 2417 register_t *retval; 2418 { 2419 struct sys_rmdir_args /* { 2420 syscallarg(const char *) path; 2421 } */ *uap = v; 2422 register struct vnode *vp; 2423 int error; 2424 struct nameidata nd; 2425 2426 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2427 SCARG(uap, path), p); 2428 if ((error = namei(&nd)) != 0) 2429 return (error); 2430 vp = nd.ni_vp; 2431 if (vp->v_type != VDIR) { 2432 error = ENOTDIR; 2433 goto out; 2434 } 2435 /* 2436 * No rmdir "." please. 2437 */ 2438 if (nd.ni_dvp == vp) { 2439 error = EINVAL; 2440 goto out; 2441 } 2442 /* 2443 * The root of a mounted filesystem cannot be deleted. 2444 */ 2445 if (vp->v_flag & VROOT) 2446 error = EBUSY; 2447 out: 2448 if (!error) { 2449 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2450 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2451 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2452 } else { 2453 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2454 if (nd.ni_dvp == vp) 2455 vrele(nd.ni_dvp); 2456 else 2457 vput(nd.ni_dvp); 2458 vput(vp); 2459 } 2460 return (error); 2461 } 2462 2463 /* 2464 * Read a block of directory entries in a file system independent format. 2465 */ 2466 int 2467 sys_getdents(p, v, retval) 2468 struct proc *p; 2469 void *v; 2470 register_t *retval; 2471 { 2472 register struct sys_getdents_args /* { 2473 syscallarg(int) fd; 2474 syscallarg(char *) buf; 2475 syscallarg(size_t) count; 2476 } */ *uap = v; 2477 struct file *fp; 2478 int error, done; 2479 2480 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2481 return (error); 2482 if ((fp->f_flag & FREAD) == 0) 2483 return (EBADF); 2484 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2485 SCARG(uap, count), &done, p, 0, 0); 2486 *retval = done; 2487 return (error); 2488 } 2489 2490 /* 2491 * Set the mode mask for creation of filesystem nodes. 2492 */ 2493 int 2494 sys_umask(p, v, retval) 2495 struct proc *p; 2496 void *v; 2497 register_t *retval; 2498 { 2499 struct sys_umask_args /* { 2500 syscallarg(mode_t) newmask; 2501 } */ *uap = v; 2502 register struct filedesc *fdp; 2503 2504 fdp = p->p_fd; 2505 *retval = fdp->fd_cmask; 2506 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2507 return (0); 2508 } 2509 2510 /* 2511 * Void all references to file by ripping underlying filesystem 2512 * away from vnode. 2513 */ 2514 /* ARGSUSED */ 2515 int 2516 sys_revoke(p, v, retval) 2517 struct proc *p; 2518 void *v; 2519 register_t *retval; 2520 { 2521 register struct sys_revoke_args /* { 2522 syscallarg(const char *) path; 2523 } */ *uap = v; 2524 register struct vnode *vp; 2525 struct vattr vattr; 2526 int error; 2527 struct nameidata nd; 2528 2529 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2530 if ((error = namei(&nd)) != 0) 2531 return (error); 2532 vp = nd.ni_vp; 2533 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2534 goto out; 2535 if (p->p_ucred->cr_uid != vattr.va_uid && 2536 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2537 goto out; 2538 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2539 VOP_REVOKE(vp, REVOKEALL); 2540 out: 2541 vrele(vp); 2542 return (error); 2543 } 2544 2545 /* 2546 * Convert a user file descriptor to a kernel file entry. 2547 */ 2548 int 2549 getvnode(fdp, fd, fpp) 2550 struct filedesc *fdp; 2551 int fd; 2552 struct file **fpp; 2553 { 2554 struct vnode *vp; 2555 struct file *fp; 2556 2557 if ((u_int)fd >= fdp->fd_nfiles || 2558 (fp = fdp->fd_ofiles[fd]) == NULL) 2559 return (EBADF); 2560 if (fp->f_type != DTYPE_VNODE) 2561 return (EINVAL); 2562 vp = (struct vnode *)fp->f_data; 2563 if (vp->v_type == VBAD) 2564 return (EBADF); 2565 *fpp = fp; 2566 return (0); 2567 } 2568
Indexes created Tue Sep 23 22:09:46 GMT 2025