vfs_syscalls.c revision 1.133.4.5
1 /* $NetBSD: vfs_syscalls.c,v 1.133.4.5 1999/08/02 22:19:15 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 41 */ 42 43 #include "opt_compat_netbsd.h" 44 #include "opt_compat_43.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/namei.h> 49 #include <sys/filedesc.h> 50 #include <sys/kernel.h> 51 #include <sys/file.h> 52 #include <sys/stat.h> 53 #include <sys/vnode.h> 54 #include <sys/mount.h> 55 #include <sys/proc.h> 56 #include <sys/uio.h> 57 #include <sys/malloc.h> 58 #include <sys/dirent.h> 59 60 #include <sys/syscallargs.h> 61 62 #include <vm/vm.h> 63 #include <sys/sysctl.h> 64 65 #include <uvm/uvm_extern.h> 66 67 static int change_dir __P((struct nameidata *, struct proc *)); 68 static int change_mode __P((struct vnode *, int, struct proc *p)); 69 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 70 int)); 71 static int change_utimes __P((struct vnode *vp, const struct timeval *, 72 struct proc *p)); 73 static int rename_files __P((const char *, const char *, struct proc *, int)); 74 75 void checkdirs __P((struct vnode *)); 76 int dounmount __P((struct mount *, int, struct proc *)); 77 78 /* 79 * Virtual File System System Calls 80 */ 81 82 /* 83 * Mount a file system. 84 */ 85 86 /* 87 * This table is used to maintain compatibility with 4.3BSD 88 * and NetBSD 0.9 mount syscalls. Note, the order is important! 89 * 90 * Also note that not all of these had actual numbers in 4.3BSD 91 * or NetBSD 0.9! 92 */ 93 const char *mountcompatnames[] = { 94 NULL, /* 0 = MOUNT_NONE */ 95 MOUNT_FFS, /* 1 */ 96 MOUNT_NFS, /* 2 */ 97 MOUNT_MFS, /* 3 */ 98 MOUNT_MSDOS, /* 4 */ 99 MOUNT_LFS, /* 5 */ 100 NULL, /* 6 = MOUNT_LOFS */ 101 MOUNT_FDESC, /* 7 */ 102 MOUNT_PORTAL, /* 8 */ 103 MOUNT_NULL, /* 9 */ 104 MOUNT_UMAP, /* 10 */ 105 MOUNT_KERNFS, /* 11 */ 106 MOUNT_PROCFS, /* 12 */ 107 MOUNT_AFS, /* 13 */ 108 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 109 MOUNT_UNION, /* 15 */ 110 MOUNT_ADOSFS, /* 16 */ 111 MOUNT_EXT2FS, /* 17 */ 112 MOUNT_CODA, /* 18 */ 113 MOUNT_FILECORE, /* 19 */ 114 MOUNT_NTFS, /* 20 */ 115 }; 116 const int nmountcompatnames = sizeof(mountcompatnames) / 117 sizeof(mountcompatnames[0]); 118 119 /* ARGSUSED */ 120 int 121 sys_mount(p, v, retval) 122 struct proc *p; 123 void *v; 124 register_t *retval; 125 { 126 register struct sys_mount_args /* { 127 syscallarg(const char *) type; 128 syscallarg(const char *) path; 129 syscallarg(int) flags; 130 syscallarg(void *) data; 131 } */ *uap = v; 132 struct vnode *vp; 133 struct mount *mp; 134 int error, flag = 0; 135 char fstypename[MFSNAMELEN]; 136 struct vattr va; 137 struct nameidata nd; 138 struct vfsops *vfs; 139 140 /* 141 * Get vnode to be covered 142 */ 143 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 144 SCARG(uap, path), p); 145 if ((error = namei(&nd)) != 0) 146 return (error); 147 vp = nd.ni_vp; 148 /* 149 * A lookup in VFS_MOUNT might result in an attempt to 150 * lock this vnode again, so make the lock resursive. 151 */ 152 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 153 if (SCARG(uap, flags) & MNT_UPDATE) { 154 if ((vp->v_flag & VROOT) == 0) { 155 vput(vp); 156 return (EINVAL); 157 } 158 mp = vp->v_mount; 159 flag = mp->mnt_flag; 160 vfs = mp->mnt_op; 161 /* 162 * We only allow the filesystem to be reloaded if it 163 * is currently mounted read-only. 164 */ 165 if ((SCARG(uap, flags) & MNT_RELOAD) && 166 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 167 vput(vp); 168 return (EOPNOTSUPP); /* Needs translation */ 169 } 170 /* 171 * In "highly secure" mode, don't let the caller do anything 172 * but downgrade a filesystem from read-write to read-only. 173 * (see also below; MNT_UPDATE is required.) 174 */ 175 if (securelevel >= 2 && 176 (SCARG(uap, flags) != 177 (mp->mnt_flag | MNT_RDONLY | 178 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 179 vput(vp); 180 return (EPERM); 181 } 182 mp->mnt_flag |= 183 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 184 /* 185 * Only root, or the user that did the original mount is 186 * permitted to update it. 187 */ 188 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 189 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 190 vput(vp); 191 return (error); 192 } 193 /* 194 * Do not allow NFS export by non-root users. For non-root 195 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 196 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 197 */ 198 if (p->p_ucred->cr_uid != 0) { 199 if (SCARG(uap, flags) & MNT_EXPORTED) { 200 vput(vp); 201 return (EPERM); 202 } 203 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 204 if (flag & MNT_NOEXEC) 205 SCARG(uap, flags) |= MNT_NOEXEC; 206 } 207 if (vfs_busy(mp, LK_NOWAIT, 0)) { 208 vput(vp); 209 return (EPERM); 210 } 211 VOP_UNLOCK(vp, 0); 212 goto update; 213 } else { 214 if (securelevel >= 2) 215 return (EPERM); 216 } 217 /* 218 * If the user is not root, ensure that they own the directory 219 * onto which we are attempting to mount. 220 */ 221 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 222 (va.va_uid != p->p_ucred->cr_uid && 223 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 224 vput(vp); 225 return (error); 226 } 227 /* 228 * Do not allow NFS export by non-root users. For non-root users, 229 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 230 * mount point is already MNT_NOEXEC. 231 */ 232 if (p->p_ucred->cr_uid != 0) { 233 if (SCARG(uap, flags) & MNT_EXPORTED) { 234 vput(vp); 235 return (EPERM); 236 } 237 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 238 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 239 SCARG(uap, flags) |= MNT_NOEXEC; 240 } 241 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 242 return (error); 243 if (vp->v_type != VDIR) { 244 vput(vp); 245 return (ENOTDIR); 246 } 247 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 248 if (error) { 249 #if defined(COMPAT_09) || defined(COMPAT_43) 250 /* 251 * Historically filesystem types were identified by number. 252 * If we get an integer for the filesystem type instead of a 253 * string, we check to see if it matches one of the historic 254 * filesystem types. 255 */ 256 u_long fsindex = (u_long)SCARG(uap, type); 257 if (fsindex >= nmountcompatnames || 258 mountcompatnames[fsindex] == NULL) { 259 vput(vp); 260 return (ENODEV); 261 } 262 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 263 #else 264 vput(vp); 265 return (error); 266 #endif 267 } 268 #ifdef COMPAT_10 269 /* Accept `ufs' as an alias for `ffs'. */ 270 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 271 strncpy(fstypename, "ffs", MFSNAMELEN); 272 #endif 273 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 274 vput(vp); 275 return (ENODEV); 276 } 277 if (vp->v_mountedhere != NULL) { 278 vput(vp); 279 return (EBUSY); 280 } 281 282 /* 283 * Allocate and initialize the file system. 284 */ 285 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 286 M_MOUNT, M_WAITOK); 287 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 288 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 289 (void)vfs_busy(mp, LK_NOWAIT, 0); 290 mp->mnt_op = vfs; 291 vfs->vfs_refcount++; 292 mp->mnt_vnodecovered = vp; 293 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 294 update: 295 /* 296 * Set the mount level flags. 297 */ 298 if (SCARG(uap, flags) & MNT_RDONLY) 299 mp->mnt_flag |= MNT_RDONLY; 300 else if (mp->mnt_flag & MNT_RDONLY) 301 mp->mnt_flag |= MNT_WANTRDWR; 302 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 303 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 304 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 305 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 306 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 307 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 308 /* 309 * Mount the filesystem. 310 */ 311 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 312 if (mp->mnt_flag & MNT_UPDATE) { 313 vrele(vp); 314 if (mp->mnt_flag & MNT_WANTRDWR) 315 mp->mnt_flag &= ~MNT_RDONLY; 316 mp->mnt_flag &=~ 317 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 318 if (error) 319 mp->mnt_flag = flag; 320 vfs_unbusy(mp); 321 return (error); 322 } 323 /* 324 * Put the new filesystem on the mount list after root. 325 */ 326 cache_purge(vp); 327 if (!error) { 328 vp->v_mountedhere = mp; 329 simple_lock(&mountlist_slock); 330 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 331 simple_unlock(&mountlist_slock); 332 checkdirs(vp); 333 VOP_UNLOCK(vp, 0); 334 vfs_unbusy(mp); 335 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 336 if ((error = VFS_START(mp, 0, p))) 337 vrele(vp); 338 } else { 339 vp->v_mountedhere = (struct mount *)0; 340 vfs->vfs_refcount--; 341 vfs_unbusy(mp); 342 free((caddr_t)mp, M_MOUNT); 343 vput(vp); 344 } 345 return (error); 346 } 347 348 /* 349 * Scan all active processes to see if any of them have a current 350 * or root directory onto which the new filesystem has just been 351 * mounted. If so, replace them with the new mount point. 352 */ 353 void 354 checkdirs(olddp) 355 struct vnode *olddp; 356 { 357 struct cwdinfo *cwdi; 358 struct vnode *newdp; 359 struct proc *p; 360 361 if (olddp->v_usecount == 1) 362 return; 363 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 364 panic("mount: lost mount"); 365 proclist_lock_read(); 366 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 367 cwdi = p->p_cwdi; 368 if (cwdi->cwdi_cdir == olddp) { 369 vrele(cwdi->cwdi_cdir); 370 VREF(newdp); 371 cwdi->cwdi_cdir = newdp; 372 } 373 if (cwdi->cwdi_rdir == olddp) { 374 vrele(cwdi->cwdi_rdir); 375 VREF(newdp); 376 cwdi->cwdi_rdir = newdp; 377 } 378 } 379 proclist_unlock_read(); 380 if (rootvnode == olddp) { 381 vrele(rootvnode); 382 VREF(newdp); 383 rootvnode = newdp; 384 } 385 vput(newdp); 386 } 387 388 /* 389 * Unmount a file system. 390 * 391 * Note: unmount takes a path to the vnode mounted on as argument, 392 * not special file (as before). 393 */ 394 /* ARGSUSED */ 395 int 396 sys_unmount(p, v, retval) 397 struct proc *p; 398 void *v; 399 register_t *retval; 400 { 401 register struct sys_unmount_args /* { 402 syscallarg(const char *) path; 403 syscallarg(int) flags; 404 } */ *uap = v; 405 register struct vnode *vp; 406 struct mount *mp; 407 int error; 408 struct nameidata nd; 409 410 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 411 SCARG(uap, path), p); 412 if ((error = namei(&nd)) != 0) 413 return (error); 414 vp = nd.ni_vp; 415 mp = vp->v_mount; 416 417 /* 418 * Only root, or the user that did the original mount is 419 * permitted to unmount this filesystem. 420 */ 421 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 422 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 423 vput(vp); 424 return (error); 425 } 426 427 /* 428 * Don't allow unmounting the root file system. 429 */ 430 if (mp->mnt_flag & MNT_ROOTFS) { 431 vput(vp); 432 return (EINVAL); 433 } 434 435 /* 436 * Must be the root of the filesystem 437 */ 438 if ((vp->v_flag & VROOT) == 0) { 439 vput(vp); 440 return (EINVAL); 441 } 442 vput(vp); 443 444 if (vfs_busy(mp, 0, 0)) 445 return (EBUSY); 446 447 return (dounmount(mp, SCARG(uap, flags), p)); 448 } 449 450 /* 451 * Do the actual file system unmount. File system is assumed to have been 452 * marked busy by the caller. 453 */ 454 int 455 dounmount(mp, flags, p) 456 register struct mount *mp; 457 int flags; 458 struct proc *p; 459 { 460 struct vnode *coveredvp; 461 int error; 462 int async; 463 464 simple_lock(&mountlist_slock); 465 mp->mnt_flag |= MNT_UNMOUNT; 466 vfs_unbusy(mp); 467 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 468 if (mp->mnt_flag & MNT_EXPUBLIC) 469 vfs_setpublicfs(NULL, NULL, NULL); 470 async = mp->mnt_flag & MNT_ASYNC; 471 mp->mnt_flag &=~ MNT_ASYNC; 472 cache_purgevfs(mp); /* remove cache entries for this file sys */ 473 if (((mp->mnt_flag & MNT_RDONLY) || 474 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 475 (flags & MNT_FORCE)) 476 error = VFS_UNMOUNT(mp, flags, p); 477 simple_lock(&mountlist_slock); 478 if (error) { 479 mp->mnt_flag &= ~MNT_UNMOUNT; 480 mp->mnt_flag |= async; 481 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 482 &mountlist_slock); 483 while(mp->mnt_wcnt > 0) { 484 wakeup((caddr_t)mp); 485 sleep(&mp->mnt_wcnt, PVFS); 486 } 487 return (error); 488 } 489 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 490 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 491 coveredvp->v_mountedhere = NULL; 492 vrele(coveredvp); 493 } 494 mp->mnt_op->vfs_refcount--; 495 if (mp->mnt_vnodelist.lh_first != NULL) 496 panic("unmount: dangling vnode"); 497 mp->mnt_flag |= MNT_GONE; 498 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 499 while(mp->mnt_wcnt > 0) { 500 wakeup((caddr_t)mp); 501 sleep(&mp->mnt_wcnt, PVFS); 502 } 503 free((caddr_t)mp, M_MOUNT); 504 return (0); 505 } 506 507 /* 508 * Sync each mounted filesystem. 509 */ 510 #ifdef DEBUG 511 int syncprt = 0; 512 struct ctldebug debug0 = { "syncprt", &syncprt }; 513 #endif 514 515 /* ARGSUSED */ 516 int 517 sys_sync(p, v, retval) 518 struct proc *p; 519 void *v; 520 register_t *retval; 521 { 522 register struct mount *mp, *nmp; 523 int asyncflag; 524 525 simple_lock(&mountlist_slock); 526 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 527 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 528 nmp = mp->mnt_list.cqe_prev; 529 continue; 530 } 531 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 532 asyncflag = mp->mnt_flag & MNT_ASYNC; 533 mp->mnt_flag &= ~MNT_ASYNC; 534 uvm_vnp_sync(mp); 535 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 536 if (asyncflag) 537 mp->mnt_flag |= MNT_ASYNC; 538 } 539 simple_lock(&mountlist_slock); 540 nmp = mp->mnt_list.cqe_prev; 541 vfs_unbusy(mp); 542 543 } 544 simple_unlock(&mountlist_slock); 545 #ifdef DEBUG 546 if (syncprt) 547 vfs_bufstats(); 548 #endif /* DEBUG */ 549 return (0); 550 } 551 552 /* 553 * Change filesystem quotas. 554 */ 555 /* ARGSUSED */ 556 int 557 sys_quotactl(p, v, retval) 558 struct proc *p; 559 void *v; 560 register_t *retval; 561 { 562 register struct sys_quotactl_args /* { 563 syscallarg(const char *) path; 564 syscallarg(int) cmd; 565 syscallarg(int) uid; 566 syscallarg(caddr_t) arg; 567 } */ *uap = v; 568 register struct mount *mp; 569 int error; 570 struct nameidata nd; 571 572 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 573 if ((error = namei(&nd)) != 0) 574 return (error); 575 mp = nd.ni_vp->v_mount; 576 vrele(nd.ni_vp); 577 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 578 SCARG(uap, arg), p)); 579 } 580 581 /* 582 * Get filesystem statistics. 583 */ 584 /* ARGSUSED */ 585 int 586 sys_statfs(p, v, retval) 587 struct proc *p; 588 void *v; 589 register_t *retval; 590 { 591 register struct sys_statfs_args /* { 592 syscallarg(const char *) path; 593 syscallarg(struct statfs *) buf; 594 } */ *uap = v; 595 register struct mount *mp; 596 register struct statfs *sp; 597 int error; 598 struct nameidata nd; 599 600 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 601 if ((error = namei(&nd)) != 0) 602 return (error); 603 mp = nd.ni_vp->v_mount; 604 sp = &mp->mnt_stat; 605 vrele(nd.ni_vp); 606 if ((error = VFS_STATFS(mp, sp, p)) != 0) 607 return (error); 608 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 609 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 610 } 611 612 /* 613 * Get filesystem statistics. 614 */ 615 /* ARGSUSED */ 616 int 617 sys_fstatfs(p, v, retval) 618 struct proc *p; 619 void *v; 620 register_t *retval; 621 { 622 register struct sys_fstatfs_args /* { 623 syscallarg(int) fd; 624 syscallarg(struct statfs *) buf; 625 } */ *uap = v; 626 struct file *fp; 627 struct mount *mp; 628 register struct statfs *sp; 629 int error; 630 631 /* getvnode() will use the descriptor for us */ 632 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 633 return (error); 634 mp = ((struct vnode *)fp->f_data)->v_mount; 635 sp = &mp->mnt_stat; 636 if ((error = VFS_STATFS(mp, sp, p)) != 0) 637 goto out; 638 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 639 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 640 out: 641 FILE_UNUSE(fp, p); 642 return (error); 643 } 644 645 /* 646 * Get statistics on all filesystems. 647 */ 648 int 649 sys_getfsstat(p, v, retval) 650 struct proc *p; 651 void *v; 652 register_t *retval; 653 { 654 register struct sys_getfsstat_args /* { 655 syscallarg(struct statfs *) buf; 656 syscallarg(long) bufsize; 657 syscallarg(int) flags; 658 } */ *uap = v; 659 register struct mount *mp, *nmp; 660 register struct statfs *sp; 661 caddr_t sfsp; 662 long count, maxcount, error; 663 664 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 665 sfsp = (caddr_t)SCARG(uap, buf); 666 simple_lock(&mountlist_slock); 667 count = 0; 668 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 669 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 670 nmp = mp->mnt_list.cqe_next; 671 continue; 672 } 673 if (sfsp && count < maxcount) { 674 sp = &mp->mnt_stat; 675 /* 676 * If MNT_NOWAIT is specified, do not refresh the 677 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 678 */ 679 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 680 (SCARG(uap, flags) & MNT_WAIT)) && 681 (error = VFS_STATFS(mp, sp, p)) != 0) { 682 simple_lock(&mountlist_slock); 683 nmp = mp->mnt_list.cqe_next; 684 vfs_unbusy(mp); 685 continue; 686 } 687 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 688 error = copyout(sp, sfsp, sizeof(*sp)); 689 if (error) { 690 vfs_unbusy(mp); 691 return (error); 692 } 693 sfsp += sizeof(*sp); 694 } 695 count++; 696 simple_lock(&mountlist_slock); 697 nmp = mp->mnt_list.cqe_next; 698 vfs_unbusy(mp); 699 } 700 simple_unlock(&mountlist_slock); 701 if (sfsp && count > maxcount) 702 *retval = maxcount; 703 else 704 *retval = count; 705 return (0); 706 } 707 708 /* 709 * Change current working directory to a given file descriptor. 710 */ 711 /* ARGSUSED */ 712 int 713 sys_fchdir(p, v, retval) 714 struct proc *p; 715 void *v; 716 register_t *retval; 717 { 718 struct sys_fchdir_args /* { 719 syscallarg(int) fd; 720 } */ *uap = v; 721 struct filedesc *fdp = p->p_fd; 722 struct cwdinfo *cwdi = p->p_cwdi; 723 struct vnode *vp, *tdp; 724 struct mount *mp; 725 struct file *fp; 726 int error; 727 728 /* getvnode() will use the descriptor for us */ 729 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 730 return (error); 731 vp = (struct vnode *)fp->f_data; 732 733 VREF(vp); 734 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 735 if (vp->v_type != VDIR) 736 error = ENOTDIR; 737 else 738 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 739 while (!error && (mp = vp->v_mountedhere) != NULL) { 740 if (vfs_busy(mp, 0, 0)) 741 continue; 742 error = VFS_ROOT(mp, &tdp); 743 vfs_unbusy(mp); 744 if (error) 745 break; 746 vput(vp); 747 vp = tdp; 748 } 749 if (error) { 750 vput(vp); 751 goto out; 752 } 753 VOP_UNLOCK(vp, 0); 754 755 /* 756 * Disallow changing to a directory not under the process's 757 * current root directory (if there is one). 758 */ 759 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 760 vrele(vp); 761 error = EPERM; /* operation not permitted */ 762 goto out; 763 } 764 765 vrele(cwdi->cwdi_cdir); 766 cwdi->cwdi_cdir = vp; 767 out: 768 FILE_UNUSE(fp, p); 769 return (error); 770 } 771 772 /* 773 * Change this process's notion of the root directory to a given file descriptor. 774 */ 775 776 int 777 sys_fchroot(p, v, retval) 778 struct proc *p; 779 void *v; 780 register_t *retval; 781 { 782 struct sys_fchroot_args *uap = v; 783 struct filedesc *fdp = p->p_fd; 784 struct cwdinfo *cwdi = p->p_cwdi; 785 struct vnode *vp; 786 struct file *fp; 787 int error; 788 789 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 790 return error; 791 /* getvnode() will use the descriptor for us */ 792 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 793 return error; 794 vp = (struct vnode *) fp->f_data; 795 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 796 if (vp->v_type != VDIR) 797 error = ENOTDIR; 798 else 799 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 800 VOP_UNLOCK(vp, 0); 801 if (error) 802 goto out; 803 VREF(vp); 804 805 /* 806 * Prevent escaping from chroot by putting the root under 807 * the working directory. Silently chdir to / if we aren't 808 * already there. 809 */ 810 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 811 /* 812 * XXX would be more failsafe to change directory to a 813 * deadfs node here instead 814 */ 815 vrele(cwdi->cwdi_cdir); 816 VREF(vp); 817 cwdi->cwdi_cdir = vp; 818 } 819 820 if (cwdi->cwdi_rdir != NULL) 821 vrele(cwdi->cwdi_rdir); 822 cwdi->cwdi_rdir = vp; 823 out: 824 FILE_UNUSE(fp, p); 825 return (error); 826 } 827 828 829 830 /* 831 * Change current working directory (``.''). 832 */ 833 /* ARGSUSED */ 834 int 835 sys_chdir(p, v, retval) 836 struct proc *p; 837 void *v; 838 register_t *retval; 839 { 840 struct sys_chdir_args /* { 841 syscallarg(const char *) path; 842 } */ *uap = v; 843 struct cwdinfo *cwdi = p->p_cwdi; 844 int error; 845 struct nameidata nd; 846 847 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 848 SCARG(uap, path), p); 849 if ((error = change_dir(&nd, p)) != 0) 850 return (error); 851 vrele(cwdi->cwdi_cdir); 852 cwdi->cwdi_cdir = nd.ni_vp; 853 return (0); 854 } 855 856 /* 857 * Change notion of root (``/'') directory. 858 */ 859 /* ARGSUSED */ 860 int 861 sys_chroot(p, v, retval) 862 struct proc *p; 863 void *v; 864 register_t *retval; 865 { 866 struct sys_chroot_args /* { 867 syscallarg(const char *) path; 868 } */ *uap = v; 869 struct cwdinfo *cwdi = p->p_cwdi; 870 struct vnode *vp; 871 int error; 872 struct nameidata nd; 873 874 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 875 return (error); 876 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 877 SCARG(uap, path), p); 878 if ((error = change_dir(&nd, p)) != 0) 879 return (error); 880 if (cwdi->cwdi_rdir != NULL) 881 vrele(cwdi->cwdi_rdir); 882 vp = nd.ni_vp; 883 cwdi->cwdi_rdir = vp; 884 885 /* 886 * Prevent escaping from chroot by putting the root under 887 * the working directory. Silently chdir to / if we aren't 888 * already there. 889 */ 890 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 891 /* 892 * XXX would be more failsafe to change directory to a 893 * deadfs node here instead 894 */ 895 vrele(cwdi->cwdi_cdir); 896 VREF(vp); 897 cwdi->cwdi_cdir = vp; 898 } 899 900 return (0); 901 } 902 903 /* 904 * Common routine for chroot and chdir. 905 */ 906 static int 907 change_dir(ndp, p) 908 register struct nameidata *ndp; 909 struct proc *p; 910 { 911 struct vnode *vp; 912 int error; 913 914 if ((error = namei(ndp)) != 0) 915 return (error); 916 vp = ndp->ni_vp; 917 if (vp->v_type != VDIR) 918 error = ENOTDIR; 919 else 920 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 921 922 if (error) 923 vput(vp); 924 else 925 VOP_UNLOCK(vp, 0); 926 return (error); 927 } 928 929 /* 930 * Check permissions, allocate an open file structure, 931 * and call the device open routine if any. 932 */ 933 int 934 sys_open(p, v, retval) 935 struct proc *p; 936 void *v; 937 register_t *retval; 938 { 939 register struct sys_open_args /* { 940 syscallarg(const char *) path; 941 syscallarg(int) flags; 942 syscallarg(int) mode; 943 } */ *uap = v; 944 struct cwdinfo *cwdi = p->p_cwdi; 945 struct filedesc *fdp = p->p_fd; 946 struct file *fp; 947 struct vnode *vp; 948 int flags, cmode; 949 int type, indx, error; 950 struct flock lf; 951 struct nameidata nd; 952 extern struct fileops vnops; 953 954 flags = FFLAGS(SCARG(uap, flags)); 955 if ((flags & (FREAD | FWRITE)) == 0) 956 return (EINVAL); 957 /* falloc() will use the file descriptor for us */ 958 if ((error = falloc(p, &fp, &indx)) != 0) 959 return (error); 960 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 961 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 962 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 963 if ((error = vn_open(&nd, flags, cmode)) != 0) { 964 FILE_UNUSE(fp, p); 965 ffree(fp); 966 if ((error == ENODEV || error == ENXIO) && 967 p->p_dupfd >= 0 && /* XXX from fdopen */ 968 (error = 969 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 970 *retval = indx; 971 return (0); 972 } 973 if (error == ERESTART) 974 error = EINTR; 975 fdp->fd_ofiles[indx] = NULL; 976 return (error); 977 } 978 p->p_dupfd = 0; 979 vp = nd.ni_vp; 980 fp->f_flag = flags & FMASK; 981 fp->f_type = DTYPE_VNODE; 982 fp->f_ops = &vnops; 983 fp->f_data = (caddr_t)vp; 984 if (flags & (O_EXLOCK | O_SHLOCK)) { 985 lf.l_whence = SEEK_SET; 986 lf.l_start = 0; 987 lf.l_len = 0; 988 if (flags & O_EXLOCK) 989 lf.l_type = F_WRLCK; 990 else 991 lf.l_type = F_RDLCK; 992 type = F_FLOCK; 993 if ((flags & FNONBLOCK) == 0) 994 type |= F_WAIT; 995 VOP_UNLOCK(vp, 0); 996 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 997 if (error) { 998 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 999 FILE_UNUSE(fp, p); 1000 ffree(fp); 1001 fdp->fd_ofiles[indx] = NULL; 1002 return (error); 1003 } 1004 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1005 fp->f_flag |= FHASLOCK; 1006 } 1007 VOP_UNLOCK(vp, 0); 1008 *retval = indx; 1009 FILE_UNUSE(fp, p); 1010 return (0); 1011 } 1012 1013 /* 1014 * Get file handle system call 1015 */ 1016 int 1017 sys_getfh(p, v, retval) 1018 struct proc *p; 1019 register void *v; 1020 register_t *retval; 1021 { 1022 register struct sys_getfh_args /* { 1023 syscallarg(char *) fname; 1024 syscallarg(fhandle_t *) fhp; 1025 } */ *uap = v; 1026 register struct vnode *vp; 1027 fhandle_t fh; 1028 int error; 1029 struct nameidata nd; 1030 1031 /* 1032 * Must be super user 1033 */ 1034 error = suser(p->p_ucred, &p->p_acflag); 1035 if (error) 1036 return (error); 1037 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1038 SCARG(uap, fname), p); 1039 error = namei(&nd); 1040 if (error) 1041 return (error); 1042 vp = nd.ni_vp; 1043 memset((caddr_t)&fh, 0, sizeof(fh)); 1044 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1045 error = VFS_VPTOFH(vp, &fh.fh_fid); 1046 vput(vp); 1047 if (error) 1048 return (error); 1049 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1050 return (error); 1051 } 1052 1053 /* 1054 * Open a file given a file handle. 1055 * 1056 * Check permissions, allocate an open file structure, 1057 * and call the device open routine if any. 1058 */ 1059 int 1060 sys_fhopen(p, v, retval) 1061 struct proc *p; 1062 void *v; 1063 register_t *retval; 1064 { 1065 register struct sys_fhopen_args /* { 1066 syscallarg(const fhandle_t *) fhp; 1067 syscallarg(int) flags; 1068 } */ *uap = v; 1069 struct filedesc *fdp = p->p_fd; 1070 struct file *fp; 1071 struct vnode *vp = NULL; 1072 struct mount *mp; 1073 struct ucred *cred = p->p_ucred; 1074 int flags; 1075 struct file *nfp; 1076 int type, indx, error=0; 1077 struct flock lf; 1078 struct vattr va; 1079 fhandle_t fh; 1080 extern struct fileops vnops; 1081 1082 /* 1083 * Must be super user 1084 */ 1085 if ((error = suser(p->p_ucred, &p->p_acflag))) 1086 return (error); 1087 1088 flags = FFLAGS(SCARG(uap, flags)); 1089 if ((flags & (FREAD | FWRITE)) == 0) 1090 return (EINVAL); 1091 if ((flags & O_CREAT)) 1092 return (EINVAL); 1093 /* falloc() will use the file descriptor for us */ 1094 if ((error = falloc(p, &nfp, &indx)) != 0) 1095 return (error); 1096 fp = nfp; 1097 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1098 goto bad; 1099 1100 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1101 error = ESTALE; 1102 goto bad; 1103 } 1104 1105 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1106 vp = NULL; /* most likely unnecessary sanity for bad: */ 1107 goto bad; 1108 } 1109 1110 /* Now do an effective vn_open */ 1111 1112 if (vp->v_type == VSOCK) { 1113 error = EOPNOTSUPP; 1114 goto bad; 1115 } 1116 if (flags & FREAD) { 1117 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1118 goto bad; 1119 } 1120 if (flags & (FWRITE | O_TRUNC)) { 1121 if (vp->v_type == VDIR) { 1122 error = EISDIR; 1123 goto bad; 1124 } 1125 if ((error = vn_writechk(vp)) != 0 || 1126 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1127 goto bad; 1128 } 1129 if (flags & O_TRUNC) { 1130 VOP_UNLOCK(vp, 0); /* XXX */ 1131 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1132 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1133 VATTR_NULL(&va); 1134 va.va_size = 0; 1135 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1136 goto bad; 1137 } 1138 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1139 goto bad; 1140 if (vp->v_type == VREG && 1141 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1142 error = EIO; 1143 goto bad; 1144 } 1145 if (flags & FWRITE) 1146 vp->v_writecount++; 1147 1148 /* done with modified vn_open, now finish what sys_open does. */ 1149 1150 fp->f_flag = flags & FMASK; 1151 fp->f_type = DTYPE_VNODE; 1152 fp->f_ops = &vnops; 1153 fp->f_data = (caddr_t)vp; 1154 if (flags & (O_EXLOCK | O_SHLOCK)) { 1155 lf.l_whence = SEEK_SET; 1156 lf.l_start = 0; 1157 lf.l_len = 0; 1158 if (flags & O_EXLOCK) 1159 lf.l_type = F_WRLCK; 1160 else 1161 lf.l_type = F_RDLCK; 1162 type = F_FLOCK; 1163 if ((flags & FNONBLOCK) == 0) 1164 type |= F_WAIT; 1165 VOP_UNLOCK(vp, 0); 1166 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1167 if (error) { 1168 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1169 FILE_UNUSE(fp, p); 1170 ffree(fp); 1171 fdp->fd_ofiles[indx] = NULL; 1172 return (error); 1173 } 1174 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1175 fp->f_flag |= FHASLOCK; 1176 } 1177 VOP_UNLOCK(vp, 0); 1178 *retval = indx; 1179 FILE_UNUSE(fp, p); 1180 return (0); 1181 1182 bad: 1183 FILE_UNUSE(fp, p); 1184 ffree(fp); 1185 fdp->fd_ofiles[indx] = NULL; 1186 if (vp != NULL) 1187 vput(vp); 1188 return (error); 1189 } 1190 1191 /* ARGSUSED */ 1192 int 1193 sys_fhstat(p, v, retval) 1194 struct proc *p; 1195 void *v; 1196 register_t *retval; 1197 { 1198 register struct sys_fhstat_args /* { 1199 syscallarg(const fhandle_t *) fhp; 1200 syscallarg(struct stat *) sb; 1201 } */ *uap = v; 1202 struct stat sb; 1203 int error; 1204 fhandle_t fh; 1205 struct mount *mp; 1206 struct vnode *vp; 1207 1208 /* 1209 * Must be super user 1210 */ 1211 if ((error = suser(p->p_ucred, &p->p_acflag))) 1212 return (error); 1213 1214 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1215 return (error); 1216 1217 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1218 return (ESTALE); 1219 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1220 return (error); 1221 error = vn_stat(vp, &sb, p); 1222 vput(vp); 1223 if (error) 1224 return (error); 1225 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1226 return (error); 1227 } 1228 1229 /* ARGSUSED */ 1230 int 1231 sys_fhstatfs(p, v, retval) 1232 struct proc *p; 1233 void *v; 1234 register_t *retval; 1235 { 1236 register struct sys_fhstatfs_args /* 1237 syscallarg(const fhandle_t *) fhp; 1238 syscallarg(struct statfs *) buf; 1239 } */ *uap = v; 1240 struct statfs sp; 1241 fhandle_t fh; 1242 struct mount *mp; 1243 struct vnode *vp; 1244 int error; 1245 1246 /* 1247 * Must be super user 1248 */ 1249 if ((error = suser(p->p_ucred, &p->p_acflag))) 1250 return (error); 1251 1252 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1253 return (error); 1254 1255 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1256 return (ESTALE); 1257 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1258 return (error); 1259 mp = vp->v_mount; 1260 vput(vp); 1261 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1262 return (error); 1263 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1264 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1265 } 1266 1267 /* 1268 * Create a special file. 1269 */ 1270 /* ARGSUSED */ 1271 int 1272 sys_mknod(p, v, retval) 1273 struct proc *p; 1274 void *v; 1275 register_t *retval; 1276 { 1277 register struct sys_mknod_args /* { 1278 syscallarg(const char *) path; 1279 syscallarg(int) mode; 1280 syscallarg(int) dev; 1281 } */ *uap = v; 1282 register struct vnode *vp; 1283 struct vattr vattr; 1284 int error; 1285 int whiteout = 0; 1286 struct nameidata nd; 1287 1288 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1289 return (error); 1290 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1291 if ((error = namei(&nd)) != 0) 1292 return (error); 1293 vp = nd.ni_vp; 1294 if (vp != NULL) 1295 error = EEXIST; 1296 else { 1297 VATTR_NULL(&vattr); 1298 vattr.va_mode = 1299 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1300 vattr.va_rdev = SCARG(uap, dev); 1301 whiteout = 0; 1302 1303 switch (SCARG(uap, mode) & S_IFMT) { 1304 case S_IFMT: /* used by badsect to flag bad sectors */ 1305 vattr.va_type = VBAD; 1306 break; 1307 case S_IFCHR: 1308 vattr.va_type = VCHR; 1309 break; 1310 case S_IFBLK: 1311 vattr.va_type = VBLK; 1312 break; 1313 case S_IFWHT: 1314 whiteout = 1; 1315 break; 1316 default: 1317 error = EINVAL; 1318 break; 1319 } 1320 } 1321 if (!error) { 1322 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1323 if (whiteout) { 1324 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1325 if (error) 1326 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1327 vput(nd.ni_dvp); 1328 } else { 1329 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1330 &nd.ni_cnd, &vattr); 1331 } 1332 } else { 1333 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1334 if (nd.ni_dvp == vp) 1335 vrele(nd.ni_dvp); 1336 else 1337 vput(nd.ni_dvp); 1338 if (vp) 1339 vrele(vp); 1340 } 1341 return (error); 1342 } 1343 1344 /* 1345 * Create a named pipe. 1346 */ 1347 /* ARGSUSED */ 1348 int 1349 sys_mkfifo(p, v, retval) 1350 struct proc *p; 1351 void *v; 1352 register_t *retval; 1353 { 1354 register struct sys_mkfifo_args /* { 1355 syscallarg(const char *) path; 1356 syscallarg(int) mode; 1357 } */ *uap = v; 1358 struct vattr vattr; 1359 int error; 1360 struct nameidata nd; 1361 1362 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1363 if ((error = namei(&nd)) != 0) 1364 return (error); 1365 if (nd.ni_vp != NULL) { 1366 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1367 if (nd.ni_dvp == nd.ni_vp) 1368 vrele(nd.ni_dvp); 1369 else 1370 vput(nd.ni_dvp); 1371 vrele(nd.ni_vp); 1372 return (EEXIST); 1373 } 1374 VATTR_NULL(&vattr); 1375 vattr.va_type = VFIFO; 1376 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1377 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1378 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1379 } 1380 1381 /* 1382 * Make a hard file link. 1383 */ 1384 /* ARGSUSED */ 1385 int 1386 sys_link(p, v, retval) 1387 struct proc *p; 1388 void *v; 1389 register_t *retval; 1390 { 1391 register struct sys_link_args /* { 1392 syscallarg(const char *) path; 1393 syscallarg(const char *) link; 1394 } */ *uap = v; 1395 register struct vnode *vp; 1396 struct nameidata nd; 1397 int error; 1398 1399 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1400 if ((error = namei(&nd)) != 0) 1401 return (error); 1402 vp = nd.ni_vp; 1403 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1404 if ((error = namei(&nd)) != 0) 1405 goto out; 1406 if (nd.ni_vp) { 1407 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1408 if (nd.ni_dvp == nd.ni_vp) 1409 vrele(nd.ni_dvp); 1410 else 1411 vput(nd.ni_dvp); 1412 vrele(nd.ni_vp); 1413 error = EEXIST; 1414 goto out; 1415 } 1416 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1417 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1418 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1419 out: 1420 vrele(vp); 1421 return (error); 1422 } 1423 1424 /* 1425 * Make a symbolic link. 1426 */ 1427 /* ARGSUSED */ 1428 int 1429 sys_symlink(p, v, retval) 1430 struct proc *p; 1431 void *v; 1432 register_t *retval; 1433 { 1434 register struct sys_symlink_args /* { 1435 syscallarg(const char *) path; 1436 syscallarg(const char *) link; 1437 } */ *uap = v; 1438 struct vattr vattr; 1439 char *path; 1440 int error; 1441 struct nameidata nd; 1442 1443 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1444 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1445 if (error) 1446 goto out; 1447 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1448 if ((error = namei(&nd)) != 0) 1449 goto out; 1450 if (nd.ni_vp) { 1451 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1452 if (nd.ni_dvp == nd.ni_vp) 1453 vrele(nd.ni_dvp); 1454 else 1455 vput(nd.ni_dvp); 1456 vrele(nd.ni_vp); 1457 error = EEXIST; 1458 goto out; 1459 } 1460 VATTR_NULL(&vattr); 1461 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1462 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1463 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1464 out: 1465 FREE(path, M_NAMEI); 1466 return (error); 1467 } 1468 1469 /* 1470 * Delete a whiteout from the filesystem. 1471 */ 1472 /* ARGSUSED */ 1473 int 1474 sys_undelete(p, v, retval) 1475 struct proc *p; 1476 void *v; 1477 register_t *retval; 1478 { 1479 register struct sys_undelete_args /* { 1480 syscallarg(const char *) path; 1481 } */ *uap = v; 1482 int error; 1483 struct nameidata nd; 1484 1485 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1486 SCARG(uap, path), p); 1487 error = namei(&nd); 1488 if (error) 1489 return (error); 1490 1491 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1492 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1493 if (nd.ni_dvp == nd.ni_vp) 1494 vrele(nd.ni_dvp); 1495 else 1496 vput(nd.ni_dvp); 1497 if (nd.ni_vp) 1498 vrele(nd.ni_vp); 1499 return (EEXIST); 1500 } 1501 1502 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1503 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1504 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1505 vput(nd.ni_dvp); 1506 return (error); 1507 } 1508 1509 /* 1510 * Delete a name from the filesystem. 1511 */ 1512 /* ARGSUSED */ 1513 int 1514 sys_unlink(p, v, retval) 1515 struct proc *p; 1516 void *v; 1517 register_t *retval; 1518 { 1519 struct sys_unlink_args /* { 1520 syscallarg(const char *) path; 1521 } */ *uap = v; 1522 register struct vnode *vp; 1523 int error; 1524 struct nameidata nd; 1525 1526 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1527 SCARG(uap, path), p); 1528 if ((error = namei(&nd)) != 0) 1529 return (error); 1530 vp = nd.ni_vp; 1531 1532 /* 1533 * The root of a mounted filesystem cannot be deleted. 1534 */ 1535 if (vp->v_flag & VROOT) { 1536 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1537 if (nd.ni_dvp == vp) 1538 vrele(nd.ni_dvp); 1539 else 1540 vput(nd.ni_dvp); 1541 vput(vp); 1542 error = EBUSY; 1543 goto out; 1544 } 1545 1546 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1547 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1548 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1549 out: 1550 return (error); 1551 } 1552 1553 /* 1554 * Reposition read/write file offset. 1555 */ 1556 int 1557 sys_lseek(p, v, retval) 1558 struct proc *p; 1559 void *v; 1560 register_t *retval; 1561 { 1562 register struct sys_lseek_args /* { 1563 syscallarg(int) fd; 1564 syscallarg(int) pad; 1565 syscallarg(off_t) offset; 1566 syscallarg(int) whence; 1567 } */ *uap = v; 1568 struct ucred *cred = p->p_ucred; 1569 register struct filedesc *fdp = p->p_fd; 1570 register struct file *fp; 1571 struct vnode *vp; 1572 struct vattr vattr; 1573 register off_t newoff; 1574 int error; 1575 1576 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1577 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1578 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1579 return (EBADF); 1580 1581 FILE_USE(fp); 1582 1583 vp = (struct vnode *)fp->f_data; 1584 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1585 error = ESPIPE; 1586 goto out; 1587 } 1588 1589 switch (SCARG(uap, whence)) { 1590 case SEEK_CUR: 1591 newoff = fp->f_offset + SCARG(uap, offset); 1592 break; 1593 case SEEK_END: 1594 error = VOP_GETATTR(vp, &vattr, cred, p); 1595 if (error) 1596 goto out; 1597 newoff = SCARG(uap, offset) + vattr.va_size; 1598 break; 1599 case SEEK_SET: 1600 newoff = SCARG(uap, offset); 1601 break; 1602 default: 1603 error = EINVAL; 1604 goto out; 1605 } 1606 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1607 goto out; 1608 1609 *(off_t *)retval = fp->f_offset = newoff; 1610 out: 1611 FILE_UNUSE(fp, p); 1612 return (error); 1613 } 1614 1615 /* 1616 * Positional read system call. 1617 */ 1618 int 1619 sys_pread(p, v, retval) 1620 struct proc *p; 1621 void *v; 1622 register_t *retval; 1623 { 1624 struct sys_pread_args /* { 1625 syscallarg(int) fd; 1626 syscallarg(void *) buf; 1627 syscallarg(size_t) nbyte; 1628 syscallarg(off_t) offset; 1629 } */ *uap = v; 1630 struct filedesc *fdp = p->p_fd; 1631 struct file *fp; 1632 struct vnode *vp; 1633 off_t offset; 1634 int error, fd = SCARG(uap, fd); 1635 1636 if ((u_int)fd >= fdp->fd_nfiles || 1637 (fp = fdp->fd_ofiles[fd]) == NULL || 1638 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1639 (fp->f_flag & FREAD) == 0) 1640 return (EBADF); 1641 1642 FILE_USE(fp); 1643 1644 vp = (struct vnode *)fp->f_data; 1645 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1646 error = ESPIPE; 1647 goto out; 1648 } 1649 1650 offset = SCARG(uap, offset); 1651 1652 /* 1653 * XXX This works because no file systems actually 1654 * XXX take any action on the seek operation. 1655 */ 1656 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1657 goto out; 1658 1659 /* dofileread() will unuse the descriptor for us */ 1660 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1661 &offset, 0, retval)); 1662 1663 out: 1664 FILE_UNUSE(fp, p); 1665 return (error); 1666 } 1667 1668 /* 1669 * Positional scatter read system call. 1670 */ 1671 int 1672 sys_preadv(p, v, retval) 1673 struct proc *p; 1674 void *v; 1675 register_t *retval; 1676 { 1677 struct sys_preadv_args /* { 1678 syscallarg(int) fd; 1679 syscallarg(const struct iovec *) iovp; 1680 syscallarg(int) iovcnt; 1681 syscallarg(off_t) offset; 1682 } */ *uap = v; 1683 struct filedesc *fdp = p->p_fd; 1684 struct file *fp; 1685 struct vnode *vp; 1686 off_t offset; 1687 int error, fd = SCARG(uap, fd); 1688 1689 if ((u_int)fd >= fdp->fd_nfiles || 1690 (fp = fdp->fd_ofiles[fd]) == NULL || 1691 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1692 (fp->f_flag & FREAD) == 0) 1693 return (EBADF); 1694 1695 FILE_USE(fp); 1696 1697 vp = (struct vnode *)fp->f_data; 1698 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1699 error = ESPIPE; 1700 goto out; 1701 } 1702 1703 offset = SCARG(uap, offset); 1704 1705 /* 1706 * XXX This works because no file systems actually 1707 * XXX take any action on the seek operation. 1708 */ 1709 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1710 goto out; 1711 1712 /* dofilereadv() will unuse the descriptor for us */ 1713 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1714 &offset, 0, retval)); 1715 1716 out: 1717 FILE_UNUSE(fp, p); 1718 return (error); 1719 } 1720 1721 /* 1722 * Positional write system call. 1723 */ 1724 int 1725 sys_pwrite(p, v, retval) 1726 struct proc *p; 1727 void *v; 1728 register_t *retval; 1729 { 1730 struct sys_pwrite_args /* { 1731 syscallarg(int) fd; 1732 syscallarg(const void *) buf; 1733 syscallarg(size_t) nbyte; 1734 syscallarg(off_t) offset; 1735 } */ *uap = v; 1736 struct filedesc *fdp = p->p_fd; 1737 struct file *fp; 1738 struct vnode *vp; 1739 off_t offset; 1740 int error, fd = SCARG(uap, fd); 1741 1742 if ((u_int)fd >= fdp->fd_nfiles || 1743 (fp = fdp->fd_ofiles[fd]) == NULL || 1744 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1745 (fp->f_flag & FWRITE) == 0) 1746 return (EBADF); 1747 1748 FILE_USE(fp); 1749 1750 vp = (struct vnode *)fp->f_data; 1751 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1752 error = ESPIPE; 1753 goto out; 1754 } 1755 1756 offset = SCARG(uap, offset); 1757 1758 /* 1759 * XXX This works because no file systems actually 1760 * XXX take any action on the seek operation. 1761 */ 1762 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1763 goto out; 1764 1765 /* dofilewrite() will unuse the descriptor for us */ 1766 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1767 &offset, 0, retval)); 1768 1769 out: 1770 FILE_UNUSE(fp, p); 1771 return (error); 1772 } 1773 1774 /* 1775 * Positional gather write system call. 1776 */ 1777 int 1778 sys_pwritev(p, v, retval) 1779 struct proc *p; 1780 void *v; 1781 register_t *retval; 1782 { 1783 struct sys_pwritev_args /* { 1784 syscallarg(int) fd; 1785 syscallarg(const struct iovec *) iovp; 1786 syscallarg(int) iovcnt; 1787 syscallarg(off_t) offset; 1788 } */ *uap = v; 1789 struct filedesc *fdp = p->p_fd; 1790 struct file *fp; 1791 struct vnode *vp; 1792 off_t offset; 1793 int error, fd = SCARG(uap, fd); 1794 1795 if ((u_int)fd >= fdp->fd_nfiles || 1796 (fp = fdp->fd_ofiles[fd]) == NULL || 1797 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1798 (fp->f_flag & FWRITE) == 0) 1799 return (EBADF); 1800 1801 FILE_USE(fp); 1802 1803 vp = (struct vnode *)fp->f_data; 1804 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1805 error = ESPIPE; 1806 goto out; 1807 } 1808 1809 offset = SCARG(uap, offset); 1810 1811 /* 1812 * XXX This works because no file systems actually 1813 * XXX take any action on the seek operation. 1814 */ 1815 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1816 goto out; 1817 1818 /* dofilewritev() will unuse the descriptor for us */ 1819 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1820 &offset, 0, retval)); 1821 1822 out: 1823 FILE_UNUSE(fp, p); 1824 return (error); 1825 } 1826 1827 /* 1828 * Check access permissions. 1829 */ 1830 int 1831 sys_access(p, v, retval) 1832 struct proc *p; 1833 void *v; 1834 register_t *retval; 1835 { 1836 register struct sys_access_args /* { 1837 syscallarg(const char *) path; 1838 syscallarg(int) flags; 1839 } */ *uap = v; 1840 register struct ucred *cred = p->p_ucred; 1841 register struct vnode *vp; 1842 int error, flags, t_gid, t_uid; 1843 struct nameidata nd; 1844 1845 t_uid = cred->cr_uid; 1846 t_gid = cred->cr_gid; 1847 cred->cr_uid = p->p_cred->p_ruid; 1848 cred->cr_gid = p->p_cred->p_rgid; 1849 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1850 SCARG(uap, path), p); 1851 if ((error = namei(&nd)) != 0) 1852 goto out1; 1853 vp = nd.ni_vp; 1854 1855 /* Flags == 0 means only check for existence. */ 1856 if (SCARG(uap, flags)) { 1857 flags = 0; 1858 if (SCARG(uap, flags) & R_OK) 1859 flags |= VREAD; 1860 if (SCARG(uap, flags) & W_OK) 1861 flags |= VWRITE; 1862 if (SCARG(uap, flags) & X_OK) 1863 flags |= VEXEC; 1864 1865 error = VOP_ACCESS(vp, flags, cred, p); 1866 if (!error && (flags & VWRITE)) 1867 error = vn_writechk(vp); 1868 } 1869 vput(vp); 1870 out1: 1871 cred->cr_uid = t_uid; 1872 cred->cr_gid = t_gid; 1873 return (error); 1874 } 1875 1876 /* 1877 * Get file status; this version follows links. 1878 */ 1879 /* ARGSUSED */ 1880 int 1881 sys___stat13(p, v, retval) 1882 struct proc *p; 1883 void *v; 1884 register_t *retval; 1885 { 1886 register struct sys___stat13_args /* { 1887 syscallarg(const char *) path; 1888 syscallarg(struct stat *) ub; 1889 } */ *uap = v; 1890 struct stat sb; 1891 int error; 1892 struct nameidata nd; 1893 1894 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1895 SCARG(uap, path), p); 1896 if ((error = namei(&nd)) != 0) 1897 return (error); 1898 error = vn_stat(nd.ni_vp, &sb, p); 1899 vput(nd.ni_vp); 1900 if (error) 1901 return (error); 1902 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1903 return (error); 1904 } 1905 1906 /* 1907 * Get file status; this version does not follow links. 1908 */ 1909 /* ARGSUSED */ 1910 int 1911 sys___lstat13(p, v, retval) 1912 struct proc *p; 1913 void *v; 1914 register_t *retval; 1915 { 1916 register struct sys___lstat13_args /* { 1917 syscallarg(const char *) path; 1918 syscallarg(struct stat *) ub; 1919 } */ *uap = v; 1920 struct stat sb; 1921 int error; 1922 struct nameidata nd; 1923 1924 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1925 SCARG(uap, path), p); 1926 if ((error = namei(&nd)) != 0) 1927 return (error); 1928 error = vn_stat(nd.ni_vp, &sb, p); 1929 vput(nd.ni_vp); 1930 if (error) 1931 return (error); 1932 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1933 return (error); 1934 } 1935 1936 /* 1937 * Get configurable pathname variables. 1938 */ 1939 /* ARGSUSED */ 1940 int 1941 sys_pathconf(p, v, retval) 1942 struct proc *p; 1943 void *v; 1944 register_t *retval; 1945 { 1946 register struct sys_pathconf_args /* { 1947 syscallarg(const char *) path; 1948 syscallarg(int) name; 1949 } */ *uap = v; 1950 int error; 1951 struct nameidata nd; 1952 1953 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1954 SCARG(uap, path), p); 1955 if ((error = namei(&nd)) != 0) 1956 return (error); 1957 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1958 vput(nd.ni_vp); 1959 return (error); 1960 } 1961 1962 /* 1963 * Return target name of a symbolic link. 1964 */ 1965 /* ARGSUSED */ 1966 int 1967 sys_readlink(p, v, retval) 1968 struct proc *p; 1969 void *v; 1970 register_t *retval; 1971 { 1972 register struct sys_readlink_args /* { 1973 syscallarg(const char *) path; 1974 syscallarg(char *) buf; 1975 syscallarg(size_t) count; 1976 } */ *uap = v; 1977 register struct vnode *vp; 1978 struct iovec aiov; 1979 struct uio auio; 1980 int error; 1981 struct nameidata nd; 1982 1983 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1984 SCARG(uap, path), p); 1985 if ((error = namei(&nd)) != 0) 1986 return (error); 1987 vp = nd.ni_vp; 1988 if (vp->v_type != VLNK) 1989 error = EINVAL; 1990 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1991 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1992 aiov.iov_base = SCARG(uap, buf); 1993 aiov.iov_len = SCARG(uap, count); 1994 auio.uio_iov = &aiov; 1995 auio.uio_iovcnt = 1; 1996 auio.uio_offset = 0; 1997 auio.uio_rw = UIO_READ; 1998 auio.uio_segflg = UIO_USERSPACE; 1999 auio.uio_procp = p; 2000 auio.uio_resid = SCARG(uap, count); 2001 error = VOP_READLINK(vp, &auio, p->p_ucred); 2002 } 2003 vput(vp); 2004 *retval = SCARG(uap, count) - auio.uio_resid; 2005 return (error); 2006 } 2007 2008 /* 2009 * Change flags of a file given a path name. 2010 */ 2011 /* ARGSUSED */ 2012 int 2013 sys_chflags(p, v, retval) 2014 struct proc *p; 2015 void *v; 2016 register_t *retval; 2017 { 2018 register struct sys_chflags_args /* { 2019 syscallarg(const char *) path; 2020 syscallarg(u_long) flags; 2021 } */ *uap = v; 2022 register struct vnode *vp; 2023 struct vattr vattr; 2024 int error; 2025 struct nameidata nd; 2026 2027 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2028 if ((error = namei(&nd)) != 0) 2029 return (error); 2030 vp = nd.ni_vp; 2031 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2032 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2033 /* Non-superusers cannot change the flags on devices, even if they 2034 own them. */ 2035 if (suser(p->p_ucred, &p->p_acflag)) { 2036 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2037 goto out; 2038 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2039 error = EINVAL; 2040 goto out; 2041 } 2042 } 2043 VATTR_NULL(&vattr); 2044 vattr.va_flags = SCARG(uap, flags); 2045 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2046 out: 2047 vput(vp); 2048 return (error); 2049 } 2050 2051 /* 2052 * Change flags of a file given a file descriptor. 2053 */ 2054 /* ARGSUSED */ 2055 int 2056 sys_fchflags(p, v, retval) 2057 struct proc *p; 2058 void *v; 2059 register_t *retval; 2060 { 2061 register struct sys_fchflags_args /* { 2062 syscallarg(int) fd; 2063 syscallarg(u_long) flags; 2064 } */ *uap = v; 2065 struct vattr vattr; 2066 struct vnode *vp; 2067 struct file *fp; 2068 int error; 2069 2070 /* getvnode() will use the descriptor for us */ 2071 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2072 return (error); 2073 vp = (struct vnode *)fp->f_data; 2074 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2075 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2076 /* Non-superusers cannot change the flags on devices, even if they 2077 own them. */ 2078 if (suser(p->p_ucred, &p->p_acflag)) { 2079 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) 2080 != 0) 2081 goto out; 2082 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2083 error = EINVAL; 2084 goto out; 2085 } 2086 } 2087 VATTR_NULL(&vattr); 2088 vattr.va_flags = SCARG(uap, flags); 2089 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2090 out: 2091 VOP_UNLOCK(vp, 0); 2092 FILE_UNUSE(fp, p); 2093 return (error); 2094 } 2095 2096 /* 2097 * Change mode of a file given path name; this version follows links. 2098 */ 2099 /* ARGSUSED */ 2100 int 2101 sys_chmod(p, v, retval) 2102 struct proc *p; 2103 void *v; 2104 register_t *retval; 2105 { 2106 register struct sys_chmod_args /* { 2107 syscallarg(const char *) path; 2108 syscallarg(int) mode; 2109 } */ *uap = v; 2110 int error; 2111 struct nameidata nd; 2112 2113 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2114 if ((error = namei(&nd)) != 0) 2115 return (error); 2116 2117 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2118 2119 vrele(nd.ni_vp); 2120 return (error); 2121 } 2122 2123 /* 2124 * Change mode of a file given a file descriptor. 2125 */ 2126 /* ARGSUSED */ 2127 int 2128 sys_fchmod(p, v, retval) 2129 struct proc *p; 2130 void *v; 2131 register_t *retval; 2132 { 2133 register struct sys_fchmod_args /* { 2134 syscallarg(int) fd; 2135 syscallarg(int) mode; 2136 } */ *uap = v; 2137 struct file *fp; 2138 int error; 2139 2140 /* getvnode() will use the descriptor for us */ 2141 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2142 return (error); 2143 2144 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2145 FILE_UNUSE(fp, p); 2146 return (error); 2147 } 2148 2149 /* 2150 * Change mode of a file given path name; this version does not follow links. 2151 */ 2152 /* ARGSUSED */ 2153 int 2154 sys_lchmod(p, v, retval) 2155 struct proc *p; 2156 void *v; 2157 register_t *retval; 2158 { 2159 register struct sys_lchmod_args /* { 2160 syscallarg(const char *) path; 2161 syscallarg(int) mode; 2162 } */ *uap = v; 2163 int error; 2164 struct nameidata nd; 2165 2166 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2167 if ((error = namei(&nd)) != 0) 2168 return (error); 2169 2170 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2171 2172 vrele(nd.ni_vp); 2173 return (error); 2174 } 2175 2176 /* 2177 * Common routine to set mode given a vnode. 2178 */ 2179 static int 2180 change_mode(vp, mode, p) 2181 struct vnode *vp; 2182 int mode; 2183 struct proc *p; 2184 { 2185 struct vattr vattr; 2186 int error; 2187 2188 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2189 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2190 VATTR_NULL(&vattr); 2191 vattr.va_mode = mode & ALLPERMS; 2192 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2193 VOP_UNLOCK(vp, 0); 2194 return (error); 2195 } 2196 2197 /* 2198 * Set ownership given a path name; this version follows links. 2199 */ 2200 /* ARGSUSED */ 2201 int 2202 sys_chown(p, v, retval) 2203 struct proc *p; 2204 void *v; 2205 register_t *retval; 2206 { 2207 register struct sys_chown_args /* { 2208 syscallarg(const char *) path; 2209 syscallarg(uid_t) uid; 2210 syscallarg(gid_t) gid; 2211 } */ *uap = v; 2212 int error; 2213 struct nameidata nd; 2214 2215 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2216 if ((error = namei(&nd)) != 0) 2217 return (error); 2218 2219 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2220 2221 vrele(nd.ni_vp); 2222 return (error); 2223 } 2224 2225 /* 2226 * Set ownership given a path name; this version follows links. 2227 * Provides POSIX semantics. 2228 */ 2229 /* ARGSUSED */ 2230 int 2231 sys___posix_chown(p, v, retval) 2232 struct proc *p; 2233 void *v; 2234 register_t *retval; 2235 { 2236 register struct sys_chown_args /* { 2237 syscallarg(const char *) path; 2238 syscallarg(uid_t) uid; 2239 syscallarg(gid_t) gid; 2240 } */ *uap = v; 2241 int error; 2242 struct nameidata nd; 2243 2244 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2245 if ((error = namei(&nd)) != 0) 2246 return (error); 2247 2248 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2249 2250 vrele(nd.ni_vp); 2251 return (error); 2252 } 2253 2254 /* 2255 * Set ownership given a file descriptor. 2256 */ 2257 /* ARGSUSED */ 2258 int 2259 sys_fchown(p, v, retval) 2260 struct proc *p; 2261 void *v; 2262 register_t *retval; 2263 { 2264 register struct sys_fchown_args /* { 2265 syscallarg(int) fd; 2266 syscallarg(uid_t) uid; 2267 syscallarg(gid_t) gid; 2268 } */ *uap = v; 2269 int error; 2270 struct file *fp; 2271 2272 /* getvnode() will use the descriptor for us */ 2273 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2274 return (error); 2275 2276 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2277 SCARG(uap, gid), p, 0); 2278 FILE_UNUSE(fp, p); 2279 return (error); 2280 } 2281 2282 /* 2283 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2284 */ 2285 /* ARGSUSED */ 2286 int 2287 sys___posix_fchown(p, v, retval) 2288 struct proc *p; 2289 void *v; 2290 register_t *retval; 2291 { 2292 register struct sys_fchown_args /* { 2293 syscallarg(int) fd; 2294 syscallarg(uid_t) uid; 2295 syscallarg(gid_t) gid; 2296 } */ *uap = v; 2297 int error; 2298 struct file *fp; 2299 2300 /* getvnode() will use the descriptor for us */ 2301 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2302 return (error); 2303 2304 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2305 SCARG(uap, gid), p, 1); 2306 FILE_UNUSE(fp, p); 2307 return (error); 2308 } 2309 2310 /* 2311 * Set ownership given a path name; this version does not follow links. 2312 */ 2313 /* ARGSUSED */ 2314 int 2315 sys_lchown(p, v, retval) 2316 struct proc *p; 2317 void *v; 2318 register_t *retval; 2319 { 2320 register struct sys_lchown_args /* { 2321 syscallarg(const char *) path; 2322 syscallarg(uid_t) uid; 2323 syscallarg(gid_t) gid; 2324 } */ *uap = v; 2325 int error; 2326 struct nameidata nd; 2327 2328 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2329 if ((error = namei(&nd)) != 0) 2330 return (error); 2331 2332 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2333 2334 vrele(nd.ni_vp); 2335 return (error); 2336 } 2337 2338 /* 2339 * Set ownership given a path name; this version does not follow links. 2340 * Provides POSIX/XPG semantics. 2341 */ 2342 /* ARGSUSED */ 2343 int 2344 sys___posix_lchown(p, v, retval) 2345 struct proc *p; 2346 void *v; 2347 register_t *retval; 2348 { 2349 register struct sys_lchown_args /* { 2350 syscallarg(const char *) path; 2351 syscallarg(uid_t) uid; 2352 syscallarg(gid_t) gid; 2353 } */ *uap = v; 2354 int error; 2355 struct nameidata nd; 2356 2357 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2358 if ((error = namei(&nd)) != 0) 2359 return (error); 2360 2361 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2362 2363 vrele(nd.ni_vp); 2364 return (error); 2365 } 2366 2367 /* 2368 * Common routine to set ownership given a vnode. 2369 */ 2370 static int 2371 change_owner(vp, uid, gid, p, posix_semantics) 2372 register struct vnode *vp; 2373 uid_t uid; 2374 gid_t gid; 2375 struct proc *p; 2376 int posix_semantics; 2377 { 2378 struct vattr vattr; 2379 mode_t newmode; 2380 int error; 2381 2382 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2383 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2384 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2385 goto out; 2386 2387 #define CHANGED(x) ((x) != -1) 2388 newmode = vattr.va_mode; 2389 if (posix_semantics) { 2390 /* 2391 * POSIX/XPG semantics: if the caller is not the super-user, 2392 * clear set-user-id and set-group-id bits. Both POSIX and 2393 * the XPG consider the behaviour for calls by the super-user 2394 * implementation-defined; we leave the set-user-id and set- 2395 * group-id settings intact in that case. 2396 */ 2397 if (suser(p->p_ucred, NULL) != 0) 2398 newmode &= ~(S_ISUID | S_ISGID); 2399 } else { 2400 /* 2401 * NetBSD semantics: when changing owner and/or group, 2402 * clear the respective bit(s). 2403 */ 2404 if (CHANGED(uid)) 2405 newmode &= ~S_ISUID; 2406 if (CHANGED(gid)) 2407 newmode &= ~S_ISGID; 2408 } 2409 /* Update va_mode iff altered. */ 2410 if (vattr.va_mode == newmode) 2411 newmode = VNOVAL; 2412 2413 VATTR_NULL(&vattr); 2414 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2415 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2416 vattr.va_mode = newmode; 2417 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2418 #undef CHANGED 2419 2420 out: 2421 VOP_UNLOCK(vp, 0); 2422 return (error); 2423 } 2424 2425 /* 2426 * Set the access and modification times given a path name; this 2427 * version follows links. 2428 */ 2429 /* ARGSUSED */ 2430 int 2431 sys_utimes(p, v, retval) 2432 struct proc *p; 2433 void *v; 2434 register_t *retval; 2435 { 2436 register struct sys_utimes_args /* { 2437 syscallarg(const char *) path; 2438 syscallarg(const struct timeval *) tptr; 2439 } */ *uap = v; 2440 int error; 2441 struct nameidata nd; 2442 2443 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2444 if ((error = namei(&nd)) != 0) 2445 return (error); 2446 2447 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2448 2449 vrele(nd.ni_vp); 2450 return (error); 2451 } 2452 2453 /* 2454 * Set the access and modification times given a file descriptor. 2455 */ 2456 /* ARGSUSED */ 2457 int 2458 sys_futimes(p, v, retval) 2459 struct proc *p; 2460 void *v; 2461 register_t *retval; 2462 { 2463 register struct sys_futimes_args /* { 2464 syscallarg(int) fd; 2465 syscallarg(const struct timeval *) tptr; 2466 } */ *uap = v; 2467 int error; 2468 struct file *fp; 2469 2470 /* getvnode() will use the descriptor for us */ 2471 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2472 return (error); 2473 2474 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2475 FILE_UNUSE(fp, p); 2476 return (error); 2477 } 2478 2479 /* 2480 * Set the access and modification times given a path name; this 2481 * version does not follow links. 2482 */ 2483 /* ARGSUSED */ 2484 int 2485 sys_lutimes(p, v, retval) 2486 struct proc *p; 2487 void *v; 2488 register_t *retval; 2489 { 2490 register struct sys_lutimes_args /* { 2491 syscallarg(const char *) path; 2492 syscallarg(const struct timeval *) tptr; 2493 } */ *uap = v; 2494 int error; 2495 struct nameidata nd; 2496 2497 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2498 if ((error = namei(&nd)) != 0) 2499 return (error); 2500 2501 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2502 2503 vrele(nd.ni_vp); 2504 return (error); 2505 } 2506 2507 /* 2508 * Common routine to set access and modification times given a vnode. 2509 */ 2510 static int 2511 change_utimes(vp, tptr, p) 2512 struct vnode *vp; 2513 const struct timeval *tptr; 2514 struct proc *p; 2515 { 2516 struct timeval tv[2]; 2517 struct vattr vattr; 2518 int error; 2519 2520 VATTR_NULL(&vattr); 2521 if (tptr == NULL) { 2522 microtime(&tv[0]); 2523 tv[1] = tv[0]; 2524 vattr.va_vaflags |= VA_UTIMES_NULL; 2525 } else { 2526 error = copyin(tptr, tv, sizeof(tv)); 2527 if (error) 2528 return (error); 2529 } 2530 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2531 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2532 vattr.va_atime.tv_sec = tv[0].tv_sec; 2533 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2534 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2535 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2536 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2537 VOP_UNLOCK(vp, 0); 2538 return (error); 2539 } 2540 2541 /* 2542 * Truncate a file given its path name. 2543 */ 2544 /* ARGSUSED */ 2545 int 2546 sys_truncate(p, v, retval) 2547 struct proc *p; 2548 void *v; 2549 register_t *retval; 2550 { 2551 register struct sys_truncate_args /* { 2552 syscallarg(const char *) path; 2553 syscallarg(int) pad; 2554 syscallarg(off_t) length; 2555 } */ *uap = v; 2556 register struct vnode *vp; 2557 struct vattr vattr; 2558 int error; 2559 struct nameidata nd; 2560 2561 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2562 if ((error = namei(&nd)) != 0) 2563 return (error); 2564 vp = nd.ni_vp; 2565 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2566 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2567 if (vp->v_type == VDIR) 2568 error = EISDIR; 2569 else if ((error = vn_writechk(vp)) == 0 && 2570 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2571 VATTR_NULL(&vattr); 2572 vattr.va_size = SCARG(uap, length); 2573 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2574 } 2575 vput(vp); 2576 return (error); 2577 } 2578 2579 /* 2580 * Truncate a file given a file descriptor. 2581 */ 2582 /* ARGSUSED */ 2583 int 2584 sys_ftruncate(p, v, retval) 2585 struct proc *p; 2586 void *v; 2587 register_t *retval; 2588 { 2589 register struct sys_ftruncate_args /* { 2590 syscallarg(int) fd; 2591 syscallarg(int) pad; 2592 syscallarg(off_t) length; 2593 } */ *uap = v; 2594 struct vattr vattr; 2595 struct vnode *vp; 2596 struct file *fp; 2597 int error; 2598 2599 /* getvnode() will use the descriptor for us */ 2600 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2601 return (error); 2602 if ((fp->f_flag & FWRITE) == 0) { 2603 error = EINVAL; 2604 goto out; 2605 } 2606 vp = (struct vnode *)fp->f_data; 2607 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2608 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2609 if (vp->v_type == VDIR) 2610 error = EISDIR; 2611 else if ((error = vn_writechk(vp)) == 0) { 2612 VATTR_NULL(&vattr); 2613 vattr.va_size = SCARG(uap, length); 2614 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2615 } 2616 VOP_UNLOCK(vp, 0); 2617 out: 2618 FILE_UNUSE(fp, p); 2619 return (error); 2620 } 2621 2622 /* 2623 * Sync an open file. 2624 */ 2625 /* ARGSUSED */ 2626 int 2627 sys_fsync(p, v, retval) 2628 struct proc *p; 2629 void *v; 2630 register_t *retval; 2631 { 2632 struct sys_fsync_args /* { 2633 syscallarg(int) fd; 2634 } */ *uap = v; 2635 register struct vnode *vp; 2636 struct file *fp; 2637 int error; 2638 2639 /* getvnode() will use the descriptor for us */ 2640 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2641 return (error); 2642 vp = (struct vnode *)fp->f_data; 2643 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2644 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2645 VOP_UNLOCK(vp, 0); 2646 FILE_UNUSE(fp, p); 2647 return (error); 2648 } 2649 2650 /* 2651 * Sync the data of an open file. 2652 */ 2653 /* ARGSUSED */ 2654 int 2655 sys_fdatasync(p, v, retval) 2656 struct proc *p; 2657 void *v; 2658 register_t *retval; 2659 { 2660 struct sys_fdatasync_args /* { 2661 syscallarg(int) fd; 2662 } */ *uap = v; 2663 struct vnode *vp; 2664 struct file *fp; 2665 int error; 2666 2667 /* getvnode() will use the descriptor for us */ 2668 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2669 return (error); 2670 vp = (struct vnode *)fp->f_data; 2671 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2672 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2673 VOP_UNLOCK(vp, 0); 2674 FILE_UNUSE(fp, p); 2675 return (error); 2676 } 2677 2678 /* 2679 * Rename files, (standard) BSD semantics frontend. 2680 */ 2681 /* ARGSUSED */ 2682 int 2683 sys_rename(p, v, retval) 2684 struct proc *p; 2685 void *v; 2686 register_t *retval; 2687 { 2688 register struct sys_rename_args /* { 2689 syscallarg(const char *) from; 2690 syscallarg(const char *) to; 2691 } */ *uap = v; 2692 2693 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2694 } 2695 2696 /* 2697 * Rename files, POSIX semantics frontend. 2698 */ 2699 /* ARGSUSED */ 2700 int 2701 sys___posix_rename(p, v, retval) 2702 struct proc *p; 2703 void *v; 2704 register_t *retval; 2705 { 2706 register struct sys___posix_rename_args /* { 2707 syscallarg(const char *) from; 2708 syscallarg(const char *) to; 2709 } */ *uap = v; 2710 2711 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2712 } 2713 2714 /* 2715 * Rename files. Source and destination must either both be directories, 2716 * or both not be directories. If target is a directory, it must be empty. 2717 * If `from' and `to' refer to the same object, the value of the `retain' 2718 * argument is used to determine whether `from' will be 2719 * 2720 * (retain == 0) deleted unless `from' and `to' refer to the same 2721 * object in the file system's name space (BSD). 2722 * (retain == 1) always retained (POSIX). 2723 */ 2724 static int 2725 rename_files(from, to, p, retain) 2726 const char *from, *to; 2727 struct proc *p; 2728 int retain; 2729 { 2730 register struct vnode *tvp, *fvp, *tdvp; 2731 struct nameidata fromnd, tond; 2732 int error; 2733 2734 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2735 from, p); 2736 if ((error = namei(&fromnd)) != 0) 2737 return (error); 2738 fvp = fromnd.ni_vp; 2739 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2740 UIO_USERSPACE, to, p); 2741 if ((error = namei(&tond)) != 0) { 2742 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2743 vrele(fromnd.ni_dvp); 2744 vrele(fvp); 2745 goto out1; 2746 } 2747 tdvp = tond.ni_dvp; 2748 tvp = tond.ni_vp; 2749 2750 if (tvp != NULL) { 2751 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2752 error = ENOTDIR; 2753 goto out; 2754 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2755 error = EISDIR; 2756 goto out; 2757 } 2758 } 2759 2760 if (fvp == tdvp) 2761 error = EINVAL; 2762 2763 /* 2764 * Source and destination refer to the same object. 2765 */ 2766 if (fvp == tvp) { 2767 if (retain) 2768 error = -1; 2769 else if (fromnd.ni_dvp == tdvp && 2770 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2771 !memcmp(fromnd.ni_cnd.cn_nameptr, 2772 tond.ni_cnd.cn_nameptr, 2773 fromnd.ni_cnd.cn_namelen)) 2774 error = -1; 2775 } 2776 2777 out: 2778 if (!error) { 2779 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2780 if (fromnd.ni_dvp != tdvp) 2781 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2782 if (tvp) { 2783 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2784 } 2785 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2786 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2787 } else { 2788 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2789 if (tdvp == tvp) 2790 vrele(tdvp); 2791 else 2792 vput(tdvp); 2793 if (tvp) 2794 vput(tvp); 2795 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2796 vrele(fromnd.ni_dvp); 2797 vrele(fvp); 2798 } 2799 vrele(tond.ni_startdir); 2800 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2801 out1: 2802 if (fromnd.ni_startdir) 2803 vrele(fromnd.ni_startdir); 2804 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2805 return (error == -1 ? 0 : error); 2806 } 2807 2808 /* 2809 * Make a directory file. 2810 */ 2811 /* ARGSUSED */ 2812 int 2813 sys_mkdir(p, v, retval) 2814 struct proc *p; 2815 void *v; 2816 register_t *retval; 2817 { 2818 register struct sys_mkdir_args /* { 2819 syscallarg(const char *) path; 2820 syscallarg(int) mode; 2821 } */ *uap = v; 2822 register struct vnode *vp; 2823 struct vattr vattr; 2824 int error; 2825 struct nameidata nd; 2826 2827 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2828 if ((error = namei(&nd)) != 0) 2829 return (error); 2830 vp = nd.ni_vp; 2831 if (vp != NULL) { 2832 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2833 if (nd.ni_dvp == vp) 2834 vrele(nd.ni_dvp); 2835 else 2836 vput(nd.ni_dvp); 2837 vrele(vp); 2838 return (EEXIST); 2839 } 2840 VATTR_NULL(&vattr); 2841 vattr.va_type = VDIR; 2842 vattr.va_mode = 2843 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2844 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2845 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2846 if (!error) 2847 vput(nd.ni_vp); 2848 return (error); 2849 } 2850 2851 /* 2852 * Remove a directory file. 2853 */ 2854 /* ARGSUSED */ 2855 int 2856 sys_rmdir(p, v, retval) 2857 struct proc *p; 2858 void *v; 2859 register_t *retval; 2860 { 2861 struct sys_rmdir_args /* { 2862 syscallarg(const char *) path; 2863 } */ *uap = v; 2864 register struct vnode *vp; 2865 int error; 2866 struct nameidata nd; 2867 2868 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2869 SCARG(uap, path), p); 2870 if ((error = namei(&nd)) != 0) 2871 return (error); 2872 vp = nd.ni_vp; 2873 if (vp->v_type != VDIR) { 2874 error = ENOTDIR; 2875 goto out; 2876 } 2877 /* 2878 * No rmdir "." please. 2879 */ 2880 if (nd.ni_dvp == vp) { 2881 error = EINVAL; 2882 goto out; 2883 } 2884 /* 2885 * The root of a mounted filesystem cannot be deleted. 2886 */ 2887 if (vp->v_flag & VROOT) 2888 error = EBUSY; 2889 out: 2890 if (!error) { 2891 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2892 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2893 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2894 } else { 2895 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2896 if (nd.ni_dvp == vp) 2897 vrele(nd.ni_dvp); 2898 else 2899 vput(nd.ni_dvp); 2900 vput(vp); 2901 } 2902 return (error); 2903 } 2904 2905 /* 2906 * Read a block of directory entries in a file system independent format. 2907 */ 2908 int 2909 sys_getdents(p, v, retval) 2910 struct proc *p; 2911 void *v; 2912 register_t *retval; 2913 { 2914 register struct sys_getdents_args /* { 2915 syscallarg(int) fd; 2916 syscallarg(char *) buf; 2917 syscallarg(size_t) count; 2918 } */ *uap = v; 2919 struct file *fp; 2920 int error, done; 2921 2922 /* getvnode() will use the descriptor for us */ 2923 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2924 return (error); 2925 if ((fp->f_flag & FREAD) == 0) { 2926 error = EBADF; 2927 goto out; 2928 } 2929 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2930 SCARG(uap, count), &done, p, 0, 0); 2931 *retval = done; 2932 out: 2933 FILE_UNUSE(fp, p); 2934 return (error); 2935 } 2936 2937 /* 2938 * Set the mode mask for creation of filesystem nodes. 2939 */ 2940 int 2941 sys_umask(p, v, retval) 2942 struct proc *p; 2943 void *v; 2944 register_t *retval; 2945 { 2946 struct sys_umask_args /* { 2947 syscallarg(mode_t) newmask; 2948 } */ *uap = v; 2949 struct cwdinfo *cwdi; 2950 2951 cwdi = p->p_cwdi; 2952 *retval = cwdi->cwdi_cmask; 2953 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2954 return (0); 2955 } 2956 2957 /* 2958 * Void all references to file by ripping underlying filesystem 2959 * away from vnode. 2960 */ 2961 /* ARGSUSED */ 2962 int 2963 sys_revoke(p, v, retval) 2964 struct proc *p; 2965 void *v; 2966 register_t *retval; 2967 { 2968 register struct sys_revoke_args /* { 2969 syscallarg(const char *) path; 2970 } */ *uap = v; 2971 register struct vnode *vp; 2972 struct vattr vattr; 2973 int error; 2974 struct nameidata nd; 2975 2976 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2977 if ((error = namei(&nd)) != 0) 2978 return (error); 2979 vp = nd.ni_vp; 2980 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2981 goto out; 2982 if (p->p_ucred->cr_uid != vattr.va_uid && 2983 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2984 goto out; 2985 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 2986 VOP_REVOKE(vp, REVOKEALL); 2987 out: 2988 vrele(vp); 2989 return (error); 2990 } 2991 2992 /* 2993 * Convert a user file descriptor to a kernel file entry. 2994 */ 2995 int 2996 getvnode(fdp, fd, fpp) 2997 struct filedesc *fdp; 2998 int fd; 2999 struct file **fpp; 3000 { 3001 struct vnode *vp; 3002 struct file *fp; 3003 3004 if ((u_int)fd >= fdp->fd_nfiles || 3005 (fp = fdp->fd_ofiles[fd]) == NULL || 3006 (fp->f_iflags & FIF_WANTCLOSE) != 0) 3007 return (EBADF); 3008 3009 FILE_USE(fp); 3010 3011 if (fp->f_type != DTYPE_VNODE) { 3012 FILE_UNUSE(fp, NULL); 3013 return (EINVAL); 3014 } 3015 3016 vp = (struct vnode *)fp->f_data; 3017 if (vp->v_type == VBAD) { 3018 FILE_UNUSE(fp, NULL); 3019 return (EBADF); 3020 } 3021 3022 *fpp = fp; 3023 return (0); 3024 } 3025
Indexes created Fri Oct 03 02:09:57 GMT 2025