vfs_syscalls.c revision 1.146
1 /* $NetBSD: vfs_syscalls.c,v 1.146 1999/07/31 03:18:43 christos 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 (flags & FWRITE) 1141 vp->v_writecount++; 1142 1143 /* done with modified vn_open, now finish what sys_open does. */ 1144 1145 fp->f_flag = flags & FMASK; 1146 fp->f_type = DTYPE_VNODE; 1147 fp->f_ops = &vnops; 1148 fp->f_data = (caddr_t)vp; 1149 if (flags & (O_EXLOCK | O_SHLOCK)) { 1150 lf.l_whence = SEEK_SET; 1151 lf.l_start = 0; 1152 lf.l_len = 0; 1153 if (flags & O_EXLOCK) 1154 lf.l_type = F_WRLCK; 1155 else 1156 lf.l_type = F_RDLCK; 1157 type = F_FLOCK; 1158 if ((flags & FNONBLOCK) == 0) 1159 type |= F_WAIT; 1160 VOP_UNLOCK(vp, 0); 1161 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1162 if (error) { 1163 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1164 FILE_UNUSE(fp, p); 1165 ffree(fp); 1166 fdp->fd_ofiles[indx] = NULL; 1167 return (error); 1168 } 1169 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1170 fp->f_flag |= FHASLOCK; 1171 } 1172 VOP_UNLOCK(vp, 0); 1173 *retval = indx; 1174 FILE_UNUSE(fp, p); 1175 return (0); 1176 1177 bad: 1178 FILE_UNUSE(fp, p); 1179 ffree(fp); 1180 fdp->fd_ofiles[indx] = NULL; 1181 if (vp != NULL) 1182 vput(vp); 1183 return (error); 1184 } 1185 1186 /* ARGSUSED */ 1187 int 1188 sys_fhstat(p, v, retval) 1189 struct proc *p; 1190 void *v; 1191 register_t *retval; 1192 { 1193 register struct sys_fhstat_args /* { 1194 syscallarg(const fhandle_t *) fhp; 1195 syscallarg(struct stat *) sb; 1196 } */ *uap = v; 1197 struct stat sb; 1198 int error; 1199 fhandle_t fh; 1200 struct mount *mp; 1201 struct vnode *vp; 1202 1203 /* 1204 * Must be super user 1205 */ 1206 if ((error = suser(p->p_ucred, &p->p_acflag))) 1207 return (error); 1208 1209 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1210 return (error); 1211 1212 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1213 return (ESTALE); 1214 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1215 return (error); 1216 error = vn_stat(vp, &sb, p); 1217 vput(vp); 1218 if (error) 1219 return (error); 1220 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1221 return (error); 1222 } 1223 1224 /* ARGSUSED */ 1225 int 1226 sys_fhstatfs(p, v, retval) 1227 struct proc *p; 1228 void *v; 1229 register_t *retval; 1230 { 1231 register struct sys_fhstatfs_args /* 1232 syscallarg(const fhandle_t *) fhp; 1233 syscallarg(struct statfs *) buf; 1234 } */ *uap = v; 1235 struct statfs sp; 1236 fhandle_t fh; 1237 struct mount *mp; 1238 struct vnode *vp; 1239 int error; 1240 1241 /* 1242 * Must be super user 1243 */ 1244 if ((error = suser(p->p_ucred, &p->p_acflag))) 1245 return (error); 1246 1247 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1248 return (error); 1249 1250 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1251 return (ESTALE); 1252 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1253 return (error); 1254 mp = vp->v_mount; 1255 vput(vp); 1256 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1257 return (error); 1258 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1259 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1260 } 1261 1262 /* 1263 * Create a special file. 1264 */ 1265 /* ARGSUSED */ 1266 int 1267 sys_mknod(p, v, retval) 1268 struct proc *p; 1269 void *v; 1270 register_t *retval; 1271 { 1272 register struct sys_mknod_args /* { 1273 syscallarg(const char *) path; 1274 syscallarg(int) mode; 1275 syscallarg(int) dev; 1276 } */ *uap = v; 1277 register struct vnode *vp; 1278 struct vattr vattr; 1279 int error; 1280 int whiteout = 0; 1281 struct nameidata nd; 1282 1283 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1284 return (error); 1285 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1286 if ((error = namei(&nd)) != 0) 1287 return (error); 1288 vp = nd.ni_vp; 1289 if (vp != NULL) 1290 error = EEXIST; 1291 else { 1292 VATTR_NULL(&vattr); 1293 vattr.va_mode = 1294 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1295 vattr.va_rdev = SCARG(uap, dev); 1296 whiteout = 0; 1297 1298 switch (SCARG(uap, mode) & S_IFMT) { 1299 case S_IFMT: /* used by badsect to flag bad sectors */ 1300 vattr.va_type = VBAD; 1301 break; 1302 case S_IFCHR: 1303 vattr.va_type = VCHR; 1304 break; 1305 case S_IFBLK: 1306 vattr.va_type = VBLK; 1307 break; 1308 case S_IFWHT: 1309 whiteout = 1; 1310 break; 1311 default: 1312 error = EINVAL; 1313 break; 1314 } 1315 } 1316 if (!error) { 1317 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1318 if (whiteout) { 1319 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1320 if (error) 1321 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1322 vput(nd.ni_dvp); 1323 } else { 1324 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1325 &nd.ni_cnd, &vattr); 1326 } 1327 } else { 1328 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1329 if (nd.ni_dvp == vp) 1330 vrele(nd.ni_dvp); 1331 else 1332 vput(nd.ni_dvp); 1333 if (vp) 1334 vrele(vp); 1335 } 1336 return (error); 1337 } 1338 1339 /* 1340 * Create a named pipe. 1341 */ 1342 /* ARGSUSED */ 1343 int 1344 sys_mkfifo(p, v, retval) 1345 struct proc *p; 1346 void *v; 1347 register_t *retval; 1348 { 1349 register struct sys_mkfifo_args /* { 1350 syscallarg(const char *) path; 1351 syscallarg(int) mode; 1352 } */ *uap = v; 1353 struct vattr vattr; 1354 int error; 1355 struct nameidata nd; 1356 1357 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1358 if ((error = namei(&nd)) != 0) 1359 return (error); 1360 if (nd.ni_vp != NULL) { 1361 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1362 if (nd.ni_dvp == nd.ni_vp) 1363 vrele(nd.ni_dvp); 1364 else 1365 vput(nd.ni_dvp); 1366 vrele(nd.ni_vp); 1367 return (EEXIST); 1368 } 1369 VATTR_NULL(&vattr); 1370 vattr.va_type = VFIFO; 1371 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1372 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1373 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1374 } 1375 1376 /* 1377 * Make a hard file link. 1378 */ 1379 /* ARGSUSED */ 1380 int 1381 sys_link(p, v, retval) 1382 struct proc *p; 1383 void *v; 1384 register_t *retval; 1385 { 1386 register struct sys_link_args /* { 1387 syscallarg(const char *) path; 1388 syscallarg(const char *) link; 1389 } */ *uap = v; 1390 register struct vnode *vp; 1391 struct nameidata nd; 1392 int error; 1393 1394 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1395 if ((error = namei(&nd)) != 0) 1396 return (error); 1397 vp = nd.ni_vp; 1398 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1399 if ((error = namei(&nd)) != 0) 1400 goto out; 1401 if (nd.ni_vp) { 1402 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1403 if (nd.ni_dvp == nd.ni_vp) 1404 vrele(nd.ni_dvp); 1405 else 1406 vput(nd.ni_dvp); 1407 vrele(nd.ni_vp); 1408 error = EEXIST; 1409 goto out; 1410 } 1411 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1412 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1413 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1414 out: 1415 vrele(vp); 1416 return (error); 1417 } 1418 1419 /* 1420 * Make a symbolic link. 1421 */ 1422 /* ARGSUSED */ 1423 int 1424 sys_symlink(p, v, retval) 1425 struct proc *p; 1426 void *v; 1427 register_t *retval; 1428 { 1429 register struct sys_symlink_args /* { 1430 syscallarg(const char *) path; 1431 syscallarg(const char *) link; 1432 } */ *uap = v; 1433 struct vattr vattr; 1434 char *path; 1435 int error; 1436 struct nameidata nd; 1437 1438 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1439 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1440 if (error) 1441 goto out; 1442 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1443 if ((error = namei(&nd)) != 0) 1444 goto out; 1445 if (nd.ni_vp) { 1446 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1447 if (nd.ni_dvp == nd.ni_vp) 1448 vrele(nd.ni_dvp); 1449 else 1450 vput(nd.ni_dvp); 1451 vrele(nd.ni_vp); 1452 error = EEXIST; 1453 goto out; 1454 } 1455 VATTR_NULL(&vattr); 1456 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1457 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1458 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1459 out: 1460 FREE(path, M_NAMEI); 1461 return (error); 1462 } 1463 1464 /* 1465 * Delete a whiteout from the filesystem. 1466 */ 1467 /* ARGSUSED */ 1468 int 1469 sys_undelete(p, v, retval) 1470 struct proc *p; 1471 void *v; 1472 register_t *retval; 1473 { 1474 register struct sys_undelete_args /* { 1475 syscallarg(const char *) path; 1476 } */ *uap = v; 1477 int error; 1478 struct nameidata nd; 1479 1480 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1481 SCARG(uap, path), p); 1482 error = namei(&nd); 1483 if (error) 1484 return (error); 1485 1486 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1487 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1488 if (nd.ni_dvp == nd.ni_vp) 1489 vrele(nd.ni_dvp); 1490 else 1491 vput(nd.ni_dvp); 1492 if (nd.ni_vp) 1493 vrele(nd.ni_vp); 1494 return (EEXIST); 1495 } 1496 1497 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1498 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1499 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1500 vput(nd.ni_dvp); 1501 return (error); 1502 } 1503 1504 /* 1505 * Delete a name from the filesystem. 1506 */ 1507 /* ARGSUSED */ 1508 int 1509 sys_unlink(p, v, retval) 1510 struct proc *p; 1511 void *v; 1512 register_t *retval; 1513 { 1514 struct sys_unlink_args /* { 1515 syscallarg(const char *) path; 1516 } */ *uap = v; 1517 register struct vnode *vp; 1518 int error; 1519 struct nameidata nd; 1520 1521 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1522 SCARG(uap, path), p); 1523 if ((error = namei(&nd)) != 0) 1524 return (error); 1525 vp = nd.ni_vp; 1526 1527 /* 1528 * The root of a mounted filesystem cannot be deleted. 1529 */ 1530 if (vp->v_flag & VROOT) { 1531 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1532 if (nd.ni_dvp == vp) 1533 vrele(nd.ni_dvp); 1534 else 1535 vput(nd.ni_dvp); 1536 vput(vp); 1537 error = EBUSY; 1538 goto out; 1539 } 1540 1541 (void)uvm_vnp_uncache(vp); 1542 1543 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1544 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1545 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1546 out: 1547 return (error); 1548 } 1549 1550 /* 1551 * Reposition read/write file offset. 1552 */ 1553 int 1554 sys_lseek(p, v, retval) 1555 struct proc *p; 1556 void *v; 1557 register_t *retval; 1558 { 1559 register struct sys_lseek_args /* { 1560 syscallarg(int) fd; 1561 syscallarg(int) pad; 1562 syscallarg(off_t) offset; 1563 syscallarg(int) whence; 1564 } */ *uap = v; 1565 struct ucred *cred = p->p_ucred; 1566 register struct filedesc *fdp = p->p_fd; 1567 register struct file *fp; 1568 struct vnode *vp; 1569 struct vattr vattr; 1570 register off_t newoff; 1571 int error; 1572 1573 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1574 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1575 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1576 return (EBADF); 1577 1578 FILE_USE(fp); 1579 1580 vp = (struct vnode *)fp->f_data; 1581 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1582 error = ESPIPE; 1583 goto out; 1584 } 1585 1586 switch (SCARG(uap, whence)) { 1587 case SEEK_CUR: 1588 newoff = fp->f_offset + SCARG(uap, offset); 1589 break; 1590 case SEEK_END: 1591 error = VOP_GETATTR(vp, &vattr, cred, p); 1592 if (error) 1593 goto out; 1594 newoff = SCARG(uap, offset) + vattr.va_size; 1595 break; 1596 case SEEK_SET: 1597 newoff = SCARG(uap, offset); 1598 break; 1599 default: 1600 error = EINVAL; 1601 goto out; 1602 } 1603 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1604 goto out; 1605 1606 *(off_t *)retval = fp->f_offset = newoff; 1607 out: 1608 FILE_UNUSE(fp, p); 1609 return (error); 1610 } 1611 1612 /* 1613 * Positional read system call. 1614 */ 1615 int 1616 sys_pread(p, v, retval) 1617 struct proc *p; 1618 void *v; 1619 register_t *retval; 1620 { 1621 struct sys_pread_args /* { 1622 syscallarg(int) fd; 1623 syscallarg(void *) buf; 1624 syscallarg(size_t) nbyte; 1625 syscallarg(off_t) offset; 1626 } */ *uap = v; 1627 struct filedesc *fdp = p->p_fd; 1628 struct file *fp; 1629 struct vnode *vp; 1630 off_t offset; 1631 int error, fd = SCARG(uap, fd); 1632 1633 if ((u_int)fd >= fdp->fd_nfiles || 1634 (fp = fdp->fd_ofiles[fd]) == NULL || 1635 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1636 (fp->f_flag & FREAD) == 0) 1637 return (EBADF); 1638 1639 FILE_USE(fp); 1640 1641 vp = (struct vnode *)fp->f_data; 1642 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1643 error = ESPIPE; 1644 goto out; 1645 } 1646 1647 offset = SCARG(uap, offset); 1648 1649 /* 1650 * XXX This works because no file systems actually 1651 * XXX take any action on the seek operation. 1652 */ 1653 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1654 goto out; 1655 1656 /* dofileread() will unuse the descriptor for us */ 1657 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1658 &offset, 0, retval)); 1659 1660 out: 1661 FILE_UNUSE(fp, p); 1662 return (error); 1663 } 1664 1665 /* 1666 * Positional scatter read system call. 1667 */ 1668 int 1669 sys_preadv(p, v, retval) 1670 struct proc *p; 1671 void *v; 1672 register_t *retval; 1673 { 1674 struct sys_preadv_args /* { 1675 syscallarg(int) fd; 1676 syscallarg(const struct iovec *) iovp; 1677 syscallarg(int) iovcnt; 1678 syscallarg(off_t) offset; 1679 } */ *uap = v; 1680 struct filedesc *fdp = p->p_fd; 1681 struct file *fp; 1682 struct vnode *vp; 1683 off_t offset; 1684 int error, fd = SCARG(uap, fd); 1685 1686 if ((u_int)fd >= fdp->fd_nfiles || 1687 (fp = fdp->fd_ofiles[fd]) == NULL || 1688 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1689 (fp->f_flag & FREAD) == 0) 1690 return (EBADF); 1691 1692 FILE_USE(fp); 1693 1694 vp = (struct vnode *)fp->f_data; 1695 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1696 error = ESPIPE; 1697 goto out; 1698 } 1699 1700 offset = SCARG(uap, offset); 1701 1702 /* 1703 * XXX This works because no file systems actually 1704 * XXX take any action on the seek operation. 1705 */ 1706 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1707 goto out; 1708 1709 /* dofilereadv() will unuse the descriptor for us */ 1710 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1711 &offset, 0, retval)); 1712 1713 out: 1714 FILE_UNUSE(fp, p); 1715 return (error); 1716 } 1717 1718 /* 1719 * Positional write system call. 1720 */ 1721 int 1722 sys_pwrite(p, v, retval) 1723 struct proc *p; 1724 void *v; 1725 register_t *retval; 1726 { 1727 struct sys_pwrite_args /* { 1728 syscallarg(int) fd; 1729 syscallarg(const void *) buf; 1730 syscallarg(size_t) nbyte; 1731 syscallarg(off_t) offset; 1732 } */ *uap = v; 1733 struct filedesc *fdp = p->p_fd; 1734 struct file *fp; 1735 struct vnode *vp; 1736 off_t offset; 1737 int error, fd = SCARG(uap, fd); 1738 1739 if ((u_int)fd >= fdp->fd_nfiles || 1740 (fp = fdp->fd_ofiles[fd]) == NULL || 1741 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1742 (fp->f_flag & FWRITE) == 0) 1743 return (EBADF); 1744 1745 FILE_USE(fp); 1746 1747 vp = (struct vnode *)fp->f_data; 1748 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1749 error = ESPIPE; 1750 goto out; 1751 } 1752 1753 offset = SCARG(uap, offset); 1754 1755 /* 1756 * XXX This works because no file systems actually 1757 * XXX take any action on the seek operation. 1758 */ 1759 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1760 goto out; 1761 1762 /* dofilewrite() will unuse the descriptor for us */ 1763 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1764 &offset, 0, retval)); 1765 1766 out: 1767 FILE_UNUSE(fp, p); 1768 return (error); 1769 } 1770 1771 /* 1772 * Positional gather write system call. 1773 */ 1774 int 1775 sys_pwritev(p, v, retval) 1776 struct proc *p; 1777 void *v; 1778 register_t *retval; 1779 { 1780 struct sys_pwritev_args /* { 1781 syscallarg(int) fd; 1782 syscallarg(const struct iovec *) iovp; 1783 syscallarg(int) iovcnt; 1784 syscallarg(off_t) offset; 1785 } */ *uap = v; 1786 struct filedesc *fdp = p->p_fd; 1787 struct file *fp; 1788 struct vnode *vp; 1789 off_t offset; 1790 int error, fd = SCARG(uap, fd); 1791 1792 if ((u_int)fd >= fdp->fd_nfiles || 1793 (fp = fdp->fd_ofiles[fd]) == NULL || 1794 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1795 (fp->f_flag & FWRITE) == 0) 1796 return (EBADF); 1797 1798 FILE_USE(fp); 1799 1800 vp = (struct vnode *)fp->f_data; 1801 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1802 error = ESPIPE; 1803 goto out; 1804 } 1805 1806 offset = SCARG(uap, offset); 1807 1808 /* 1809 * XXX This works because no file systems actually 1810 * XXX take any action on the seek operation. 1811 */ 1812 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1813 goto out; 1814 1815 /* dofilewritev() will unuse the descriptor for us */ 1816 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1817 &offset, 0, retval)); 1818 1819 out: 1820 FILE_UNUSE(fp, p); 1821 return (error); 1822 } 1823 1824 /* 1825 * Check access permissions. 1826 */ 1827 int 1828 sys_access(p, v, retval) 1829 struct proc *p; 1830 void *v; 1831 register_t *retval; 1832 { 1833 register struct sys_access_args /* { 1834 syscallarg(const char *) path; 1835 syscallarg(int) flags; 1836 } */ *uap = v; 1837 register struct ucred *cred = p->p_ucred; 1838 register struct vnode *vp; 1839 int error, flags, t_gid, t_uid; 1840 struct nameidata nd; 1841 1842 t_uid = cred->cr_uid; 1843 t_gid = cred->cr_gid; 1844 cred->cr_uid = p->p_cred->p_ruid; 1845 cred->cr_gid = p->p_cred->p_rgid; 1846 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1847 SCARG(uap, path), p); 1848 if ((error = namei(&nd)) != 0) 1849 goto out1; 1850 vp = nd.ni_vp; 1851 1852 /* Flags == 0 means only check for existence. */ 1853 if (SCARG(uap, flags)) { 1854 flags = 0; 1855 if (SCARG(uap, flags) & R_OK) 1856 flags |= VREAD; 1857 if (SCARG(uap, flags) & W_OK) 1858 flags |= VWRITE; 1859 if (SCARG(uap, flags) & X_OK) 1860 flags |= VEXEC; 1861 1862 error = VOP_ACCESS(vp, flags, cred, p); 1863 if (!error && (flags & VWRITE)) 1864 error = vn_writechk(vp); 1865 } 1866 vput(vp); 1867 out1: 1868 cred->cr_uid = t_uid; 1869 cred->cr_gid = t_gid; 1870 return (error); 1871 } 1872 1873 /* 1874 * Get file status; this version follows links. 1875 */ 1876 /* ARGSUSED */ 1877 int 1878 sys___stat13(p, v, retval) 1879 struct proc *p; 1880 void *v; 1881 register_t *retval; 1882 { 1883 register struct sys___stat13_args /* { 1884 syscallarg(const char *) path; 1885 syscallarg(struct stat *) ub; 1886 } */ *uap = v; 1887 struct stat sb; 1888 int error; 1889 struct nameidata nd; 1890 1891 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1892 SCARG(uap, path), p); 1893 if ((error = namei(&nd)) != 0) 1894 return (error); 1895 error = vn_stat(nd.ni_vp, &sb, p); 1896 vput(nd.ni_vp); 1897 if (error) 1898 return (error); 1899 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1900 return (error); 1901 } 1902 1903 /* 1904 * Get file status; this version does not follow links. 1905 */ 1906 /* ARGSUSED */ 1907 int 1908 sys___lstat13(p, v, retval) 1909 struct proc *p; 1910 void *v; 1911 register_t *retval; 1912 { 1913 register struct sys___lstat13_args /* { 1914 syscallarg(const char *) path; 1915 syscallarg(struct stat *) ub; 1916 } */ *uap = v; 1917 struct stat sb; 1918 int error; 1919 struct nameidata nd; 1920 1921 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1922 SCARG(uap, path), p); 1923 if ((error = namei(&nd)) != 0) 1924 return (error); 1925 error = vn_stat(nd.ni_vp, &sb, p); 1926 vput(nd.ni_vp); 1927 if (error) 1928 return (error); 1929 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1930 return (error); 1931 } 1932 1933 /* 1934 * Get configurable pathname variables. 1935 */ 1936 /* ARGSUSED */ 1937 int 1938 sys_pathconf(p, v, retval) 1939 struct proc *p; 1940 void *v; 1941 register_t *retval; 1942 { 1943 register struct sys_pathconf_args /* { 1944 syscallarg(const char *) path; 1945 syscallarg(int) name; 1946 } */ *uap = v; 1947 int error; 1948 struct nameidata nd; 1949 1950 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1951 SCARG(uap, path), p); 1952 if ((error = namei(&nd)) != 0) 1953 return (error); 1954 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1955 vput(nd.ni_vp); 1956 return (error); 1957 } 1958 1959 /* 1960 * Return target name of a symbolic link. 1961 */ 1962 /* ARGSUSED */ 1963 int 1964 sys_readlink(p, v, retval) 1965 struct proc *p; 1966 void *v; 1967 register_t *retval; 1968 { 1969 register struct sys_readlink_args /* { 1970 syscallarg(const char *) path; 1971 syscallarg(char *) buf; 1972 syscallarg(size_t) count; 1973 } */ *uap = v; 1974 register struct vnode *vp; 1975 struct iovec aiov; 1976 struct uio auio; 1977 int error; 1978 struct nameidata nd; 1979 1980 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1981 SCARG(uap, path), p); 1982 if ((error = namei(&nd)) != 0) 1983 return (error); 1984 vp = nd.ni_vp; 1985 if (vp->v_type != VLNK) 1986 error = EINVAL; 1987 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1988 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1989 aiov.iov_base = SCARG(uap, buf); 1990 aiov.iov_len = SCARG(uap, count); 1991 auio.uio_iov = &aiov; 1992 auio.uio_iovcnt = 1; 1993 auio.uio_offset = 0; 1994 auio.uio_rw = UIO_READ; 1995 auio.uio_segflg = UIO_USERSPACE; 1996 auio.uio_procp = p; 1997 auio.uio_resid = SCARG(uap, count); 1998 error = VOP_READLINK(vp, &auio, p->p_ucred); 1999 } 2000 vput(vp); 2001 *retval = SCARG(uap, count) - auio.uio_resid; 2002 return (error); 2003 } 2004 2005 /* 2006 * Change flags of a file given a path name. 2007 */ 2008 /* ARGSUSED */ 2009 int 2010 sys_chflags(p, v, retval) 2011 struct proc *p; 2012 void *v; 2013 register_t *retval; 2014 { 2015 register struct sys_chflags_args /* { 2016 syscallarg(const char *) path; 2017 syscallarg(u_long) flags; 2018 } */ *uap = v; 2019 register struct vnode *vp; 2020 struct vattr vattr; 2021 int error; 2022 struct nameidata nd; 2023 2024 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2025 if ((error = namei(&nd)) != 0) 2026 return (error); 2027 vp = nd.ni_vp; 2028 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2029 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2030 /* Non-superusers cannot change the flags on devices, even if they 2031 own them. */ 2032 if (suser(p->p_ucred, &p->p_acflag)) { 2033 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2034 goto out; 2035 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2036 error = EINVAL; 2037 goto out; 2038 } 2039 } 2040 VATTR_NULL(&vattr); 2041 vattr.va_flags = SCARG(uap, flags); 2042 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2043 out: 2044 vput(vp); 2045 return (error); 2046 } 2047 2048 /* 2049 * Change flags of a file given a file descriptor. 2050 */ 2051 /* ARGSUSED */ 2052 int 2053 sys_fchflags(p, v, retval) 2054 struct proc *p; 2055 void *v; 2056 register_t *retval; 2057 { 2058 register struct sys_fchflags_args /* { 2059 syscallarg(int) fd; 2060 syscallarg(u_long) flags; 2061 } */ *uap = v; 2062 struct vattr vattr; 2063 struct vnode *vp; 2064 struct file *fp; 2065 int error; 2066 2067 /* getvnode() will use the descriptor for us */ 2068 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2069 return (error); 2070 vp = (struct vnode *)fp->f_data; 2071 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2072 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2073 /* Non-superusers cannot change the flags on devices, even if they 2074 own them. */ 2075 if (suser(p->p_ucred, &p->p_acflag)) { 2076 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) 2077 != 0) 2078 goto out; 2079 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2080 error = EINVAL; 2081 goto out; 2082 } 2083 } 2084 VATTR_NULL(&vattr); 2085 vattr.va_flags = SCARG(uap, flags); 2086 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2087 out: 2088 VOP_UNLOCK(vp, 0); 2089 FILE_UNUSE(fp, p); 2090 return (error); 2091 } 2092 2093 /* 2094 * Change mode of a file given path name; this version follows links. 2095 */ 2096 /* ARGSUSED */ 2097 int 2098 sys_chmod(p, v, retval) 2099 struct proc *p; 2100 void *v; 2101 register_t *retval; 2102 { 2103 register struct sys_chmod_args /* { 2104 syscallarg(const char *) path; 2105 syscallarg(int) mode; 2106 } */ *uap = v; 2107 int error; 2108 struct nameidata nd; 2109 2110 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2111 if ((error = namei(&nd)) != 0) 2112 return (error); 2113 2114 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2115 2116 vrele(nd.ni_vp); 2117 return (error); 2118 } 2119 2120 /* 2121 * Change mode of a file given a file descriptor. 2122 */ 2123 /* ARGSUSED */ 2124 int 2125 sys_fchmod(p, v, retval) 2126 struct proc *p; 2127 void *v; 2128 register_t *retval; 2129 { 2130 register struct sys_fchmod_args /* { 2131 syscallarg(int) fd; 2132 syscallarg(int) mode; 2133 } */ *uap = v; 2134 struct file *fp; 2135 int error; 2136 2137 /* getvnode() will use the descriptor for us */ 2138 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2139 return (error); 2140 2141 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2142 FILE_UNUSE(fp, p); 2143 return (error); 2144 } 2145 2146 /* 2147 * Change mode of a file given path name; this version does not follow links. 2148 */ 2149 /* ARGSUSED */ 2150 int 2151 sys_lchmod(p, v, retval) 2152 struct proc *p; 2153 void *v; 2154 register_t *retval; 2155 { 2156 register struct sys_lchmod_args /* { 2157 syscallarg(const char *) path; 2158 syscallarg(int) mode; 2159 } */ *uap = v; 2160 int error; 2161 struct nameidata nd; 2162 2163 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2164 if ((error = namei(&nd)) != 0) 2165 return (error); 2166 2167 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2168 2169 vrele(nd.ni_vp); 2170 return (error); 2171 } 2172 2173 /* 2174 * Common routine to set mode given a vnode. 2175 */ 2176 static int 2177 change_mode(vp, mode, p) 2178 struct vnode *vp; 2179 int mode; 2180 struct proc *p; 2181 { 2182 struct vattr vattr; 2183 int error; 2184 2185 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2186 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2187 VATTR_NULL(&vattr); 2188 vattr.va_mode = mode & ALLPERMS; 2189 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2190 VOP_UNLOCK(vp, 0); 2191 return (error); 2192 } 2193 2194 /* 2195 * Set ownership given a path name; this version follows links. 2196 */ 2197 /* ARGSUSED */ 2198 int 2199 sys_chown(p, v, retval) 2200 struct proc *p; 2201 void *v; 2202 register_t *retval; 2203 { 2204 register struct sys_chown_args /* { 2205 syscallarg(const char *) path; 2206 syscallarg(uid_t) uid; 2207 syscallarg(gid_t) gid; 2208 } */ *uap = v; 2209 int error; 2210 struct nameidata nd; 2211 2212 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2213 if ((error = namei(&nd)) != 0) 2214 return (error); 2215 2216 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2217 2218 vrele(nd.ni_vp); 2219 return (error); 2220 } 2221 2222 /* 2223 * Set ownership given a path name; this version follows links. 2224 * Provides POSIX semantics. 2225 */ 2226 /* ARGSUSED */ 2227 int 2228 sys___posix_chown(p, v, retval) 2229 struct proc *p; 2230 void *v; 2231 register_t *retval; 2232 { 2233 register struct sys_chown_args /* { 2234 syscallarg(const char *) path; 2235 syscallarg(uid_t) uid; 2236 syscallarg(gid_t) gid; 2237 } */ *uap = v; 2238 int error; 2239 struct nameidata nd; 2240 2241 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2242 if ((error = namei(&nd)) != 0) 2243 return (error); 2244 2245 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2246 2247 vrele(nd.ni_vp); 2248 return (error); 2249 } 2250 2251 /* 2252 * Set ownership given a file descriptor. 2253 */ 2254 /* ARGSUSED */ 2255 int 2256 sys_fchown(p, v, retval) 2257 struct proc *p; 2258 void *v; 2259 register_t *retval; 2260 { 2261 register struct sys_fchown_args /* { 2262 syscallarg(int) fd; 2263 syscallarg(uid_t) uid; 2264 syscallarg(gid_t) gid; 2265 } */ *uap = v; 2266 int error; 2267 struct file *fp; 2268 2269 /* getvnode() will use the descriptor for us */ 2270 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2271 return (error); 2272 2273 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2274 SCARG(uap, gid), p, 0); 2275 FILE_UNUSE(fp, p); 2276 return (error); 2277 } 2278 2279 /* 2280 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2281 */ 2282 /* ARGSUSED */ 2283 int 2284 sys___posix_fchown(p, v, retval) 2285 struct proc *p; 2286 void *v; 2287 register_t *retval; 2288 { 2289 register struct sys_fchown_args /* { 2290 syscallarg(int) fd; 2291 syscallarg(uid_t) uid; 2292 syscallarg(gid_t) gid; 2293 } */ *uap = v; 2294 int error; 2295 struct file *fp; 2296 2297 /* getvnode() will use the descriptor for us */ 2298 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2299 return (error); 2300 2301 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2302 SCARG(uap, gid), p, 1); 2303 FILE_UNUSE(fp, p); 2304 return (error); 2305 } 2306 2307 /* 2308 * Set ownership given a path name; this version does not follow links. 2309 */ 2310 /* ARGSUSED */ 2311 int 2312 sys_lchown(p, v, retval) 2313 struct proc *p; 2314 void *v; 2315 register_t *retval; 2316 { 2317 register struct sys_lchown_args /* { 2318 syscallarg(const char *) path; 2319 syscallarg(uid_t) uid; 2320 syscallarg(gid_t) gid; 2321 } */ *uap = v; 2322 int error; 2323 struct nameidata nd; 2324 2325 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2326 if ((error = namei(&nd)) != 0) 2327 return (error); 2328 2329 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2330 2331 vrele(nd.ni_vp); 2332 return (error); 2333 } 2334 2335 /* 2336 * Set ownership given a path name; this version does not follow links. 2337 * Provides POSIX/XPG semantics. 2338 */ 2339 /* ARGSUSED */ 2340 int 2341 sys___posix_lchown(p, v, retval) 2342 struct proc *p; 2343 void *v; 2344 register_t *retval; 2345 { 2346 register struct sys_lchown_args /* { 2347 syscallarg(const char *) path; 2348 syscallarg(uid_t) uid; 2349 syscallarg(gid_t) gid; 2350 } */ *uap = v; 2351 int error; 2352 struct nameidata nd; 2353 2354 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2355 if ((error = namei(&nd)) != 0) 2356 return (error); 2357 2358 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2359 2360 vrele(nd.ni_vp); 2361 return (error); 2362 } 2363 2364 /* 2365 * Common routine to set ownership given a vnode. 2366 */ 2367 static int 2368 change_owner(vp, uid, gid, p, posix_semantics) 2369 register struct vnode *vp; 2370 uid_t uid; 2371 gid_t gid; 2372 struct proc *p; 2373 int posix_semantics; 2374 { 2375 struct vattr vattr; 2376 mode_t newmode; 2377 int error; 2378 2379 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2380 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2381 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2382 goto out; 2383 2384 #define CHANGED(x) ((x) != -1) 2385 newmode = vattr.va_mode; 2386 if (posix_semantics) { 2387 /* 2388 * POSIX/XPG semantics: if the caller is not the super-user, 2389 * clear set-user-id and set-group-id bits. Both POSIX and 2390 * the XPG consider the behaviour for calls by the super-user 2391 * implementation-defined; we leave the set-user-id and set- 2392 * group-id settings intact in that case. 2393 */ 2394 if (suser(p->p_ucred, NULL) != 0) 2395 newmode &= ~(S_ISUID | S_ISGID); 2396 } else { 2397 /* 2398 * NetBSD semantics: when changing owner and/or group, 2399 * clear the respective bit(s). 2400 */ 2401 if (CHANGED(uid)) 2402 newmode &= ~S_ISUID; 2403 if (CHANGED(gid)) 2404 newmode &= ~S_ISGID; 2405 } 2406 /* Update va_mode iff altered. */ 2407 if (vattr.va_mode == newmode) 2408 newmode = VNOVAL; 2409 2410 VATTR_NULL(&vattr); 2411 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2412 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2413 vattr.va_mode = newmode; 2414 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2415 #undef CHANGED 2416 2417 out: 2418 VOP_UNLOCK(vp, 0); 2419 return (error); 2420 } 2421 2422 /* 2423 * Set the access and modification times given a path name; this 2424 * version follows links. 2425 */ 2426 /* ARGSUSED */ 2427 int 2428 sys_utimes(p, v, retval) 2429 struct proc *p; 2430 void *v; 2431 register_t *retval; 2432 { 2433 register struct sys_utimes_args /* { 2434 syscallarg(const char *) path; 2435 syscallarg(const struct timeval *) tptr; 2436 } */ *uap = v; 2437 int error; 2438 struct nameidata nd; 2439 2440 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2441 if ((error = namei(&nd)) != 0) 2442 return (error); 2443 2444 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2445 2446 vrele(nd.ni_vp); 2447 return (error); 2448 } 2449 2450 /* 2451 * Set the access and modification times given a file descriptor. 2452 */ 2453 /* ARGSUSED */ 2454 int 2455 sys_futimes(p, v, retval) 2456 struct proc *p; 2457 void *v; 2458 register_t *retval; 2459 { 2460 register struct sys_futimes_args /* { 2461 syscallarg(int) fd; 2462 syscallarg(const struct timeval *) tptr; 2463 } */ *uap = v; 2464 int error; 2465 struct file *fp; 2466 2467 /* getvnode() will use the descriptor for us */ 2468 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2469 return (error); 2470 2471 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2472 FILE_UNUSE(fp, p); 2473 return (error); 2474 } 2475 2476 /* 2477 * Set the access and modification times given a path name; this 2478 * version does not follow links. 2479 */ 2480 /* ARGSUSED */ 2481 int 2482 sys_lutimes(p, v, retval) 2483 struct proc *p; 2484 void *v; 2485 register_t *retval; 2486 { 2487 register struct sys_lutimes_args /* { 2488 syscallarg(const char *) path; 2489 syscallarg(const struct timeval *) tptr; 2490 } */ *uap = v; 2491 int error; 2492 struct nameidata nd; 2493 2494 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2495 if ((error = namei(&nd)) != 0) 2496 return (error); 2497 2498 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2499 2500 vrele(nd.ni_vp); 2501 return (error); 2502 } 2503 2504 /* 2505 * Common routine to set access and modification times given a vnode. 2506 */ 2507 static int 2508 change_utimes(vp, tptr, p) 2509 struct vnode *vp; 2510 const struct timeval *tptr; 2511 struct proc *p; 2512 { 2513 struct timeval tv[2]; 2514 struct vattr vattr; 2515 int error; 2516 2517 VATTR_NULL(&vattr); 2518 if (tptr == NULL) { 2519 microtime(&tv[0]); 2520 tv[1] = tv[0]; 2521 vattr.va_vaflags |= VA_UTIMES_NULL; 2522 } else { 2523 error = copyin(tptr, tv, sizeof(tv)); 2524 if (error) 2525 return (error); 2526 } 2527 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2528 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2529 vattr.va_atime.tv_sec = tv[0].tv_sec; 2530 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2531 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2532 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2533 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2534 VOP_UNLOCK(vp, 0); 2535 return (error); 2536 } 2537 2538 /* 2539 * Truncate a file given its path name. 2540 */ 2541 /* ARGSUSED */ 2542 int 2543 sys_truncate(p, v, retval) 2544 struct proc *p; 2545 void *v; 2546 register_t *retval; 2547 { 2548 register struct sys_truncate_args /* { 2549 syscallarg(const char *) path; 2550 syscallarg(int) pad; 2551 syscallarg(off_t) length; 2552 } */ *uap = v; 2553 register struct vnode *vp; 2554 struct vattr vattr; 2555 int error; 2556 struct nameidata nd; 2557 2558 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2559 if ((error = namei(&nd)) != 0) 2560 return (error); 2561 vp = nd.ni_vp; 2562 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2563 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2564 if (vp->v_type == VDIR) 2565 error = EISDIR; 2566 else if ((error = vn_writechk(vp)) == 0 && 2567 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2568 VATTR_NULL(&vattr); 2569 vattr.va_size = SCARG(uap, length); 2570 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2571 } 2572 vput(vp); 2573 return (error); 2574 } 2575 2576 /* 2577 * Truncate a file given a file descriptor. 2578 */ 2579 /* ARGSUSED */ 2580 int 2581 sys_ftruncate(p, v, retval) 2582 struct proc *p; 2583 void *v; 2584 register_t *retval; 2585 { 2586 register struct sys_ftruncate_args /* { 2587 syscallarg(int) fd; 2588 syscallarg(int) pad; 2589 syscallarg(off_t) length; 2590 } */ *uap = v; 2591 struct vattr vattr; 2592 struct vnode *vp; 2593 struct file *fp; 2594 int error; 2595 2596 /* getvnode() will use the descriptor for us */ 2597 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2598 return (error); 2599 if ((fp->f_flag & FWRITE) == 0) { 2600 error = EINVAL; 2601 goto out; 2602 } 2603 vp = (struct vnode *)fp->f_data; 2604 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2605 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2606 if (vp->v_type == VDIR) 2607 error = EISDIR; 2608 else if ((error = vn_writechk(vp)) == 0) { 2609 VATTR_NULL(&vattr); 2610 vattr.va_size = SCARG(uap, length); 2611 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2612 } 2613 VOP_UNLOCK(vp, 0); 2614 out: 2615 FILE_UNUSE(fp, p); 2616 return (error); 2617 } 2618 2619 /* 2620 * Sync an open file. 2621 */ 2622 /* ARGSUSED */ 2623 int 2624 sys_fsync(p, v, retval) 2625 struct proc *p; 2626 void *v; 2627 register_t *retval; 2628 { 2629 struct sys_fsync_args /* { 2630 syscallarg(int) fd; 2631 } */ *uap = v; 2632 register struct vnode *vp; 2633 struct file *fp; 2634 int error; 2635 2636 /* getvnode() will use the descriptor for us */ 2637 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2638 return (error); 2639 vp = (struct vnode *)fp->f_data; 2640 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2641 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2642 VOP_UNLOCK(vp, 0); 2643 FILE_UNUSE(fp, p); 2644 return (error); 2645 } 2646 2647 /* 2648 * Sync the data of an open file. 2649 */ 2650 /* ARGSUSED */ 2651 int 2652 sys_fdatasync(p, v, retval) 2653 struct proc *p; 2654 void *v; 2655 register_t *retval; 2656 { 2657 struct sys_fdatasync_args /* { 2658 syscallarg(int) fd; 2659 } */ *uap = v; 2660 struct vnode *vp; 2661 struct file *fp; 2662 int error; 2663 2664 /* getvnode() will use the descriptor for us */ 2665 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2666 return (error); 2667 vp = (struct vnode *)fp->f_data; 2668 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2669 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2670 VOP_UNLOCK(vp, 0); 2671 FILE_UNUSE(fp, p); 2672 return (error); 2673 } 2674 2675 /* 2676 * Rename files, (standard) BSD semantics frontend. 2677 */ 2678 /* ARGSUSED */ 2679 int 2680 sys_rename(p, v, retval) 2681 struct proc *p; 2682 void *v; 2683 register_t *retval; 2684 { 2685 register struct sys_rename_args /* { 2686 syscallarg(const char *) from; 2687 syscallarg(const char *) to; 2688 } */ *uap = v; 2689 2690 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2691 } 2692 2693 /* 2694 * Rename files, POSIX semantics frontend. 2695 */ 2696 /* ARGSUSED */ 2697 int 2698 sys___posix_rename(p, v, retval) 2699 struct proc *p; 2700 void *v; 2701 register_t *retval; 2702 { 2703 register struct sys___posix_rename_args /* { 2704 syscallarg(const char *) from; 2705 syscallarg(const char *) to; 2706 } */ *uap = v; 2707 2708 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2709 } 2710 2711 /* 2712 * Rename files. Source and destination must either both be directories, 2713 * or both not be directories. If target is a directory, it must be empty. 2714 * If `from' and `to' refer to the same object, the value of the `retain' 2715 * argument is used to determine whether `from' will be 2716 * 2717 * (retain == 0) deleted unless `from' and `to' refer to the same 2718 * object in the file system's name space (BSD). 2719 * (retain == 1) always retained (POSIX). 2720 */ 2721 static int 2722 rename_files(from, to, p, retain) 2723 const char *from, *to; 2724 struct proc *p; 2725 int retain; 2726 { 2727 register struct vnode *tvp, *fvp, *tdvp; 2728 struct nameidata fromnd, tond; 2729 int error; 2730 2731 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2732 from, p); 2733 if ((error = namei(&fromnd)) != 0) 2734 return (error); 2735 fvp = fromnd.ni_vp; 2736 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2737 UIO_USERSPACE, to, p); 2738 if ((error = namei(&tond)) != 0) { 2739 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2740 vrele(fromnd.ni_dvp); 2741 vrele(fvp); 2742 goto out1; 2743 } 2744 tdvp = tond.ni_dvp; 2745 tvp = tond.ni_vp; 2746 2747 if (tvp != NULL) { 2748 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2749 error = ENOTDIR; 2750 goto out; 2751 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2752 error = EISDIR; 2753 goto out; 2754 } 2755 } 2756 2757 if (fvp == tdvp) 2758 error = EINVAL; 2759 2760 /* 2761 * Source and destination refer to the same object. 2762 */ 2763 if (fvp == tvp) { 2764 if (retain) 2765 error = -1; 2766 else if (fromnd.ni_dvp == tdvp && 2767 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2768 !memcmp(fromnd.ni_cnd.cn_nameptr, 2769 tond.ni_cnd.cn_nameptr, 2770 fromnd.ni_cnd.cn_namelen)) 2771 error = -1; 2772 } 2773 2774 out: 2775 if (!error) { 2776 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2777 if (fromnd.ni_dvp != tdvp) 2778 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2779 if (tvp) { 2780 (void)uvm_vnp_uncache(tvp); 2781 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2782 } 2783 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2784 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2785 } else { 2786 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2787 if (tdvp == tvp) 2788 vrele(tdvp); 2789 else 2790 vput(tdvp); 2791 if (tvp) 2792 vput(tvp); 2793 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2794 vrele(fromnd.ni_dvp); 2795 vrele(fvp); 2796 } 2797 vrele(tond.ni_startdir); 2798 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2799 out1: 2800 if (fromnd.ni_startdir) 2801 vrele(fromnd.ni_startdir); 2802 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2803 return (error == -1 ? 0 : error); 2804 } 2805 2806 /* 2807 * Make a directory file. 2808 */ 2809 /* ARGSUSED */ 2810 int 2811 sys_mkdir(p, v, retval) 2812 struct proc *p; 2813 void *v; 2814 register_t *retval; 2815 { 2816 register struct sys_mkdir_args /* { 2817 syscallarg(const char *) path; 2818 syscallarg(int) mode; 2819 } */ *uap = v; 2820 register struct vnode *vp; 2821 struct vattr vattr; 2822 int error; 2823 struct nameidata nd; 2824 2825 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2826 if ((error = namei(&nd)) != 0) 2827 return (error); 2828 vp = nd.ni_vp; 2829 if (vp != NULL) { 2830 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2831 if (nd.ni_dvp == vp) 2832 vrele(nd.ni_dvp); 2833 else 2834 vput(nd.ni_dvp); 2835 vrele(vp); 2836 return (EEXIST); 2837 } 2838 VATTR_NULL(&vattr); 2839 vattr.va_type = VDIR; 2840 vattr.va_mode = 2841 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2842 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2843 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2844 if (!error) 2845 vput(nd.ni_vp); 2846 return (error); 2847 } 2848 2849 /* 2850 * Remove a directory file. 2851 */ 2852 /* ARGSUSED */ 2853 int 2854 sys_rmdir(p, v, retval) 2855 struct proc *p; 2856 void *v; 2857 register_t *retval; 2858 { 2859 struct sys_rmdir_args /* { 2860 syscallarg(const char *) path; 2861 } */ *uap = v; 2862 register struct vnode *vp; 2863 int error; 2864 struct nameidata nd; 2865 2866 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2867 SCARG(uap, path), p); 2868 if ((error = namei(&nd)) != 0) 2869 return (error); 2870 vp = nd.ni_vp; 2871 if (vp->v_type != VDIR) { 2872 error = ENOTDIR; 2873 goto out; 2874 } 2875 /* 2876 * No rmdir "." please. 2877 */ 2878 if (nd.ni_dvp == vp) { 2879 error = EINVAL; 2880 goto out; 2881 } 2882 /* 2883 * The root of a mounted filesystem cannot be deleted. 2884 */ 2885 if (vp->v_flag & VROOT) 2886 error = EBUSY; 2887 out: 2888 if (!error) { 2889 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2890 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2891 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2892 } else { 2893 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2894 if (nd.ni_dvp == vp) 2895 vrele(nd.ni_dvp); 2896 else 2897 vput(nd.ni_dvp); 2898 vput(vp); 2899 } 2900 return (error); 2901 } 2902 2903 /* 2904 * Read a block of directory entries in a file system independent format. 2905 */ 2906 int 2907 sys_getdents(p, v, retval) 2908 struct proc *p; 2909 void *v; 2910 register_t *retval; 2911 { 2912 register struct sys_getdents_args /* { 2913 syscallarg(int) fd; 2914 syscallarg(char *) buf; 2915 syscallarg(size_t) count; 2916 } */ *uap = v; 2917 struct file *fp; 2918 int error, done; 2919 2920 /* getvnode() will use the descriptor for us */ 2921 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2922 return (error); 2923 if ((fp->f_flag & FREAD) == 0) { 2924 error = EBADF; 2925 goto out; 2926 } 2927 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2928 SCARG(uap, count), &done, p, 0, 0); 2929 *retval = done; 2930 out: 2931 FILE_UNUSE(fp, p); 2932 return (error); 2933 } 2934 2935 /* 2936 * Set the mode mask for creation of filesystem nodes. 2937 */ 2938 int 2939 sys_umask(p, v, retval) 2940 struct proc *p; 2941 void *v; 2942 register_t *retval; 2943 { 2944 struct sys_umask_args /* { 2945 syscallarg(mode_t) newmask; 2946 } */ *uap = v; 2947 struct cwdinfo *cwdi; 2948 2949 cwdi = p->p_cwdi; 2950 *retval = cwdi->cwdi_cmask; 2951 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2952 return (0); 2953 } 2954 2955 /* 2956 * Void all references to file by ripping underlying filesystem 2957 * away from vnode. 2958 */ 2959 /* ARGSUSED */ 2960 int 2961 sys_revoke(p, v, retval) 2962 struct proc *p; 2963 void *v; 2964 register_t *retval; 2965 { 2966 register struct sys_revoke_args /* { 2967 syscallarg(const char *) path; 2968 } */ *uap = v; 2969 register struct vnode *vp; 2970 struct vattr vattr; 2971 int error; 2972 struct nameidata nd; 2973 2974 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2975 if ((error = namei(&nd)) != 0) 2976 return (error); 2977 vp = nd.ni_vp; 2978 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2979 goto out; 2980 if (p->p_ucred->cr_uid != vattr.va_uid && 2981 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2982 goto out; 2983 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 2984 VOP_REVOKE(vp, REVOKEALL); 2985 out: 2986 vrele(vp); 2987 return (error); 2988 } 2989 2990 /* 2991 * Convert a user file descriptor to a kernel file entry. 2992 */ 2993 int 2994 getvnode(fdp, fd, fpp) 2995 struct filedesc *fdp; 2996 int fd; 2997 struct file **fpp; 2998 { 2999 struct vnode *vp; 3000 struct file *fp; 3001 3002 if ((u_int)fd >= fdp->fd_nfiles || 3003 (fp = fdp->fd_ofiles[fd]) == NULL || 3004 (fp->f_iflags & FIF_WANTCLOSE) != 0) 3005 return (EBADF); 3006 3007 FILE_USE(fp); 3008 3009 if (fp->f_type != DTYPE_VNODE) { 3010 FILE_UNUSE(fp, NULL); 3011 return (EINVAL); 3012 } 3013 3014 vp = (struct vnode *)fp->f_data; 3015 if (vp->v_type == VBAD) { 3016 FILE_UNUSE(fp, NULL); 3017 return (EBADF); 3018 } 3019 3020 *fpp = fp; 3021 return (0); 3022 } 3023
Indexes created Wed Sep 24 15:09:51 GMT 2025