vfs_syscalls.c revision 1.144
1 /* $NetBSD: vfs_syscalls.c,v 1.144 1999/07/25 06:30:35 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 41 */ 42 43 #include "opt_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 VATTR_NULL(&vattr); 2031 vattr.va_flags = SCARG(uap, flags); 2032 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2033 vput(vp); 2034 return (error); 2035 } 2036 2037 /* 2038 * Change flags of a file given a file descriptor. 2039 */ 2040 /* ARGSUSED */ 2041 int 2042 sys_fchflags(p, v, retval) 2043 struct proc *p; 2044 void *v; 2045 register_t *retval; 2046 { 2047 register struct sys_fchflags_args /* { 2048 syscallarg(int) fd; 2049 syscallarg(u_long) flags; 2050 } */ *uap = v; 2051 struct vattr vattr; 2052 struct vnode *vp; 2053 struct file *fp; 2054 int error; 2055 2056 /* getvnode() will use the descriptor for us */ 2057 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2058 return (error); 2059 vp = (struct vnode *)fp->f_data; 2060 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2061 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2062 VATTR_NULL(&vattr); 2063 vattr.va_flags = SCARG(uap, flags); 2064 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2065 VOP_UNLOCK(vp, 0); 2066 FILE_UNUSE(fp, p); 2067 return (error); 2068 } 2069 2070 /* 2071 * Change mode of a file given path name; this version follows links. 2072 */ 2073 /* ARGSUSED */ 2074 int 2075 sys_chmod(p, v, retval) 2076 struct proc *p; 2077 void *v; 2078 register_t *retval; 2079 { 2080 register struct sys_chmod_args /* { 2081 syscallarg(const char *) path; 2082 syscallarg(int) mode; 2083 } */ *uap = v; 2084 int error; 2085 struct nameidata nd; 2086 2087 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2088 if ((error = namei(&nd)) != 0) 2089 return (error); 2090 2091 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2092 2093 vrele(nd.ni_vp); 2094 return (error); 2095 } 2096 2097 /* 2098 * Change mode of a file given a file descriptor. 2099 */ 2100 /* ARGSUSED */ 2101 int 2102 sys_fchmod(p, v, retval) 2103 struct proc *p; 2104 void *v; 2105 register_t *retval; 2106 { 2107 register struct sys_fchmod_args /* { 2108 syscallarg(int) fd; 2109 syscallarg(int) mode; 2110 } */ *uap = v; 2111 struct file *fp; 2112 int error; 2113 2114 /* getvnode() will use the descriptor for us */ 2115 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2116 return (error); 2117 2118 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2119 FILE_UNUSE(fp, p); 2120 return (error); 2121 } 2122 2123 /* 2124 * Change mode of a file given path name; this version does not follow links. 2125 */ 2126 /* ARGSUSED */ 2127 int 2128 sys_lchmod(p, v, retval) 2129 struct proc *p; 2130 void *v; 2131 register_t *retval; 2132 { 2133 register struct sys_lchmod_args /* { 2134 syscallarg(const char *) path; 2135 syscallarg(int) mode; 2136 } */ *uap = v; 2137 int error; 2138 struct nameidata nd; 2139 2140 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2141 if ((error = namei(&nd)) != 0) 2142 return (error); 2143 2144 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2145 2146 vrele(nd.ni_vp); 2147 return (error); 2148 } 2149 2150 /* 2151 * Common routine to set mode given a vnode. 2152 */ 2153 static int 2154 change_mode(vp, mode, p) 2155 struct vnode *vp; 2156 int mode; 2157 struct proc *p; 2158 { 2159 struct vattr vattr; 2160 int error; 2161 2162 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2163 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2164 VATTR_NULL(&vattr); 2165 vattr.va_mode = mode & ALLPERMS; 2166 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2167 VOP_UNLOCK(vp, 0); 2168 return (error); 2169 } 2170 2171 /* 2172 * Set ownership given a path name; this version follows links. 2173 */ 2174 /* ARGSUSED */ 2175 int 2176 sys_chown(p, v, retval) 2177 struct proc *p; 2178 void *v; 2179 register_t *retval; 2180 { 2181 register struct sys_chown_args /* { 2182 syscallarg(const char *) path; 2183 syscallarg(uid_t) uid; 2184 syscallarg(gid_t) gid; 2185 } */ *uap = v; 2186 int error; 2187 struct nameidata nd; 2188 2189 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2190 if ((error = namei(&nd)) != 0) 2191 return (error); 2192 2193 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2194 2195 vrele(nd.ni_vp); 2196 return (error); 2197 } 2198 2199 /* 2200 * Set ownership given a path name; this version follows links. 2201 * Provides POSIX semantics. 2202 */ 2203 /* ARGSUSED */ 2204 int 2205 sys___posix_chown(p, v, retval) 2206 struct proc *p; 2207 void *v; 2208 register_t *retval; 2209 { 2210 register struct sys_chown_args /* { 2211 syscallarg(const char *) path; 2212 syscallarg(uid_t) uid; 2213 syscallarg(gid_t) gid; 2214 } */ *uap = v; 2215 int error; 2216 struct nameidata nd; 2217 2218 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2219 if ((error = namei(&nd)) != 0) 2220 return (error); 2221 2222 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2223 2224 vrele(nd.ni_vp); 2225 return (error); 2226 } 2227 2228 /* 2229 * Set ownership given a file descriptor. 2230 */ 2231 /* ARGSUSED */ 2232 int 2233 sys_fchown(p, v, retval) 2234 struct proc *p; 2235 void *v; 2236 register_t *retval; 2237 { 2238 register struct sys_fchown_args /* { 2239 syscallarg(int) fd; 2240 syscallarg(uid_t) uid; 2241 syscallarg(gid_t) gid; 2242 } */ *uap = v; 2243 int error; 2244 struct file *fp; 2245 2246 /* getvnode() will use the descriptor for us */ 2247 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2248 return (error); 2249 2250 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2251 SCARG(uap, gid), p, 0); 2252 FILE_UNUSE(fp, p); 2253 return (error); 2254 } 2255 2256 /* 2257 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2258 */ 2259 /* ARGSUSED */ 2260 int 2261 sys___posix_fchown(p, v, retval) 2262 struct proc *p; 2263 void *v; 2264 register_t *retval; 2265 { 2266 register struct sys_fchown_args /* { 2267 syscallarg(int) fd; 2268 syscallarg(uid_t) uid; 2269 syscallarg(gid_t) gid; 2270 } */ *uap = v; 2271 int error; 2272 struct file *fp; 2273 2274 /* getvnode() will use the descriptor for us */ 2275 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2276 return (error); 2277 2278 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2279 SCARG(uap, gid), p, 1); 2280 FILE_UNUSE(fp, p); 2281 return (error); 2282 } 2283 2284 /* 2285 * Set ownership given a path name; this version does not follow links. 2286 */ 2287 /* ARGSUSED */ 2288 int 2289 sys_lchown(p, v, retval) 2290 struct proc *p; 2291 void *v; 2292 register_t *retval; 2293 { 2294 register struct sys_lchown_args /* { 2295 syscallarg(const char *) path; 2296 syscallarg(uid_t) uid; 2297 syscallarg(gid_t) gid; 2298 } */ *uap = v; 2299 int error; 2300 struct nameidata nd; 2301 2302 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2303 if ((error = namei(&nd)) != 0) 2304 return (error); 2305 2306 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2307 2308 vrele(nd.ni_vp); 2309 return (error); 2310 } 2311 2312 /* 2313 * Set ownership given a path name; this version does not follow links. 2314 * Provides POSIX/XPG semantics. 2315 */ 2316 /* ARGSUSED */ 2317 int 2318 sys___posix_lchown(p, v, retval) 2319 struct proc *p; 2320 void *v; 2321 register_t *retval; 2322 { 2323 register struct sys_lchown_args /* { 2324 syscallarg(const char *) path; 2325 syscallarg(uid_t) uid; 2326 syscallarg(gid_t) gid; 2327 } */ *uap = v; 2328 int error; 2329 struct nameidata nd; 2330 2331 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2332 if ((error = namei(&nd)) != 0) 2333 return (error); 2334 2335 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2336 2337 vrele(nd.ni_vp); 2338 return (error); 2339 } 2340 2341 /* 2342 * Common routine to set ownership given a vnode. 2343 */ 2344 static int 2345 change_owner(vp, uid, gid, p, posix_semantics) 2346 register struct vnode *vp; 2347 uid_t uid; 2348 gid_t gid; 2349 struct proc *p; 2350 int posix_semantics; 2351 { 2352 struct vattr vattr; 2353 mode_t newmode; 2354 int error; 2355 2356 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2357 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2358 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2359 goto out; 2360 2361 #define CHANGED(x) ((x) != -1) 2362 newmode = vattr.va_mode; 2363 if (posix_semantics) { 2364 /* 2365 * POSIX/XPG semantics: if the caller is not the super-user, 2366 * clear set-user-id and set-group-id bits. Both POSIX and 2367 * the XPG consider the behaviour for calls by the super-user 2368 * implementation-defined; we leave the set-user-id and set- 2369 * group-id settings intact in that case. 2370 */ 2371 if (suser(p->p_ucred, NULL) != 0) 2372 newmode &= ~(S_ISUID | S_ISGID); 2373 } else { 2374 /* 2375 * NetBSD semantics: when changing owner and/or group, 2376 * clear the respective bit(s). 2377 */ 2378 if (CHANGED(uid)) 2379 newmode &= ~S_ISUID; 2380 if (CHANGED(gid)) 2381 newmode &= ~S_ISGID; 2382 } 2383 /* Update va_mode iff altered. */ 2384 if (vattr.va_mode == newmode) 2385 newmode = VNOVAL; 2386 2387 VATTR_NULL(&vattr); 2388 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2389 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2390 vattr.va_mode = newmode; 2391 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2392 #undef CHANGED 2393 2394 out: 2395 VOP_UNLOCK(vp, 0); 2396 return (error); 2397 } 2398 2399 /* 2400 * Set the access and modification times given a path name; this 2401 * version follows links. 2402 */ 2403 /* ARGSUSED */ 2404 int 2405 sys_utimes(p, v, retval) 2406 struct proc *p; 2407 void *v; 2408 register_t *retval; 2409 { 2410 register struct sys_utimes_args /* { 2411 syscallarg(const char *) path; 2412 syscallarg(const struct timeval *) tptr; 2413 } */ *uap = v; 2414 int error; 2415 struct nameidata nd; 2416 2417 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2418 if ((error = namei(&nd)) != 0) 2419 return (error); 2420 2421 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2422 2423 vrele(nd.ni_vp); 2424 return (error); 2425 } 2426 2427 /* 2428 * Set the access and modification times given a file descriptor. 2429 */ 2430 /* ARGSUSED */ 2431 int 2432 sys_futimes(p, v, retval) 2433 struct proc *p; 2434 void *v; 2435 register_t *retval; 2436 { 2437 register struct sys_futimes_args /* { 2438 syscallarg(int) fd; 2439 syscallarg(const struct timeval *) tptr; 2440 } */ *uap = v; 2441 int error; 2442 struct file *fp; 2443 2444 /* getvnode() will use the descriptor for us */ 2445 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2446 return (error); 2447 2448 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2449 FILE_UNUSE(fp, p); 2450 return (error); 2451 } 2452 2453 /* 2454 * Set the access and modification times given a path name; this 2455 * version does not follow links. 2456 */ 2457 /* ARGSUSED */ 2458 int 2459 sys_lutimes(p, v, retval) 2460 struct proc *p; 2461 void *v; 2462 register_t *retval; 2463 { 2464 register struct sys_lutimes_args /* { 2465 syscallarg(const char *) path; 2466 syscallarg(const struct timeval *) tptr; 2467 } */ *uap = v; 2468 int error; 2469 struct nameidata nd; 2470 2471 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2472 if ((error = namei(&nd)) != 0) 2473 return (error); 2474 2475 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2476 2477 vrele(nd.ni_vp); 2478 return (error); 2479 } 2480 2481 /* 2482 * Common routine to set access and modification times given a vnode. 2483 */ 2484 static int 2485 change_utimes(vp, tptr, p) 2486 struct vnode *vp; 2487 const struct timeval *tptr; 2488 struct proc *p; 2489 { 2490 struct timeval tv[2]; 2491 struct vattr vattr; 2492 int error; 2493 2494 VATTR_NULL(&vattr); 2495 if (tptr == NULL) { 2496 microtime(&tv[0]); 2497 tv[1] = tv[0]; 2498 vattr.va_vaflags |= VA_UTIMES_NULL; 2499 } else { 2500 error = copyin(tptr, tv, sizeof(tv)); 2501 if (error) 2502 return (error); 2503 } 2504 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2505 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2506 vattr.va_atime.tv_sec = tv[0].tv_sec; 2507 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2508 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2509 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2510 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2511 VOP_UNLOCK(vp, 0); 2512 return (error); 2513 } 2514 2515 /* 2516 * Truncate a file given its path name. 2517 */ 2518 /* ARGSUSED */ 2519 int 2520 sys_truncate(p, v, retval) 2521 struct proc *p; 2522 void *v; 2523 register_t *retval; 2524 { 2525 register struct sys_truncate_args /* { 2526 syscallarg(const char *) path; 2527 syscallarg(int) pad; 2528 syscallarg(off_t) length; 2529 } */ *uap = v; 2530 register struct vnode *vp; 2531 struct vattr vattr; 2532 int error; 2533 struct nameidata nd; 2534 2535 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2536 if ((error = namei(&nd)) != 0) 2537 return (error); 2538 vp = nd.ni_vp; 2539 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2540 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2541 if (vp->v_type == VDIR) 2542 error = EISDIR; 2543 else if ((error = vn_writechk(vp)) == 0 && 2544 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2545 VATTR_NULL(&vattr); 2546 vattr.va_size = SCARG(uap, length); 2547 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2548 } 2549 vput(vp); 2550 return (error); 2551 } 2552 2553 /* 2554 * Truncate a file given a file descriptor. 2555 */ 2556 /* ARGSUSED */ 2557 int 2558 sys_ftruncate(p, v, retval) 2559 struct proc *p; 2560 void *v; 2561 register_t *retval; 2562 { 2563 register struct sys_ftruncate_args /* { 2564 syscallarg(int) fd; 2565 syscallarg(int) pad; 2566 syscallarg(off_t) length; 2567 } */ *uap = v; 2568 struct vattr vattr; 2569 struct vnode *vp; 2570 struct file *fp; 2571 int error; 2572 2573 /* getvnode() will use the descriptor for us */ 2574 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2575 return (error); 2576 if ((fp->f_flag & FWRITE) == 0) { 2577 error = EINVAL; 2578 goto out; 2579 } 2580 vp = (struct vnode *)fp->f_data; 2581 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2582 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2583 if (vp->v_type == VDIR) 2584 error = EISDIR; 2585 else if ((error = vn_writechk(vp)) == 0) { 2586 VATTR_NULL(&vattr); 2587 vattr.va_size = SCARG(uap, length); 2588 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2589 } 2590 VOP_UNLOCK(vp, 0); 2591 out: 2592 FILE_UNUSE(fp, p); 2593 return (error); 2594 } 2595 2596 /* 2597 * Sync an open file. 2598 */ 2599 /* ARGSUSED */ 2600 int 2601 sys_fsync(p, v, retval) 2602 struct proc *p; 2603 void *v; 2604 register_t *retval; 2605 { 2606 struct sys_fsync_args /* { 2607 syscallarg(int) fd; 2608 } */ *uap = v; 2609 register struct vnode *vp; 2610 struct file *fp; 2611 int error; 2612 2613 /* getvnode() will use the descriptor for us */ 2614 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2615 return (error); 2616 vp = (struct vnode *)fp->f_data; 2617 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2618 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2619 VOP_UNLOCK(vp, 0); 2620 FILE_UNUSE(fp, p); 2621 return (error); 2622 } 2623 2624 /* 2625 * Sync the data of an open file. 2626 */ 2627 /* ARGSUSED */ 2628 int 2629 sys_fdatasync(p, v, retval) 2630 struct proc *p; 2631 void *v; 2632 register_t *retval; 2633 { 2634 struct sys_fdatasync_args /* { 2635 syscallarg(int) fd; 2636 } */ *uap = v; 2637 struct vnode *vp; 2638 struct file *fp; 2639 int error; 2640 2641 /* getvnode() will use the descriptor for us */ 2642 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2643 return (error); 2644 vp = (struct vnode *)fp->f_data; 2645 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2646 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2647 VOP_UNLOCK(vp, 0); 2648 FILE_UNUSE(fp, p); 2649 return (error); 2650 } 2651 2652 /* 2653 * Rename files, (standard) BSD semantics frontend. 2654 */ 2655 /* ARGSUSED */ 2656 int 2657 sys_rename(p, v, retval) 2658 struct proc *p; 2659 void *v; 2660 register_t *retval; 2661 { 2662 register struct sys_rename_args /* { 2663 syscallarg(const char *) from; 2664 syscallarg(const char *) to; 2665 } */ *uap = v; 2666 2667 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2668 } 2669 2670 /* 2671 * Rename files, POSIX semantics frontend. 2672 */ 2673 /* ARGSUSED */ 2674 int 2675 sys___posix_rename(p, v, retval) 2676 struct proc *p; 2677 void *v; 2678 register_t *retval; 2679 { 2680 register struct sys___posix_rename_args /* { 2681 syscallarg(const char *) from; 2682 syscallarg(const char *) to; 2683 } */ *uap = v; 2684 2685 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2686 } 2687 2688 /* 2689 * Rename files. Source and destination must either both be directories, 2690 * or both not be directories. If target is a directory, it must be empty. 2691 * If `from' and `to' refer to the same object, the value of the `retain' 2692 * argument is used to determine whether `from' will be 2693 * 2694 * (retain == 0) deleted unless `from' and `to' refer to the same 2695 * object in the file system's name space (BSD). 2696 * (retain == 1) always retained (POSIX). 2697 */ 2698 static int 2699 rename_files(from, to, p, retain) 2700 const char *from, *to; 2701 struct proc *p; 2702 int retain; 2703 { 2704 register struct vnode *tvp, *fvp, *tdvp; 2705 struct nameidata fromnd, tond; 2706 int error; 2707 2708 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2709 from, p); 2710 if ((error = namei(&fromnd)) != 0) 2711 return (error); 2712 fvp = fromnd.ni_vp; 2713 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2714 UIO_USERSPACE, to, p); 2715 if ((error = namei(&tond)) != 0) { 2716 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2717 vrele(fromnd.ni_dvp); 2718 vrele(fvp); 2719 goto out1; 2720 } 2721 tdvp = tond.ni_dvp; 2722 tvp = tond.ni_vp; 2723 2724 if (tvp != NULL) { 2725 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2726 error = ENOTDIR; 2727 goto out; 2728 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2729 error = EISDIR; 2730 goto out; 2731 } 2732 } 2733 2734 if (fvp == tdvp) 2735 error = EINVAL; 2736 2737 /* 2738 * Source and destination refer to the same object. 2739 */ 2740 if (fvp == tvp) { 2741 if (retain) 2742 error = -1; 2743 else if (fromnd.ni_dvp == tdvp && 2744 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2745 !memcmp(fromnd.ni_cnd.cn_nameptr, 2746 tond.ni_cnd.cn_nameptr, 2747 fromnd.ni_cnd.cn_namelen)) 2748 error = -1; 2749 } 2750 2751 out: 2752 if (!error) { 2753 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2754 if (fromnd.ni_dvp != tdvp) 2755 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2756 if (tvp) { 2757 (void)uvm_vnp_uncache(tvp); 2758 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2759 } 2760 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2761 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2762 } else { 2763 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2764 if (tdvp == tvp) 2765 vrele(tdvp); 2766 else 2767 vput(tdvp); 2768 if (tvp) 2769 vput(tvp); 2770 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2771 vrele(fromnd.ni_dvp); 2772 vrele(fvp); 2773 } 2774 vrele(tond.ni_startdir); 2775 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2776 out1: 2777 if (fromnd.ni_startdir) 2778 vrele(fromnd.ni_startdir); 2779 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2780 return (error == -1 ? 0 : error); 2781 } 2782 2783 /* 2784 * Make a directory file. 2785 */ 2786 /* ARGSUSED */ 2787 int 2788 sys_mkdir(p, v, retval) 2789 struct proc *p; 2790 void *v; 2791 register_t *retval; 2792 { 2793 register struct sys_mkdir_args /* { 2794 syscallarg(const char *) path; 2795 syscallarg(int) mode; 2796 } */ *uap = v; 2797 register struct vnode *vp; 2798 struct vattr vattr; 2799 int error; 2800 struct nameidata nd; 2801 2802 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2803 if ((error = namei(&nd)) != 0) 2804 return (error); 2805 vp = nd.ni_vp; 2806 if (vp != NULL) { 2807 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2808 if (nd.ni_dvp == vp) 2809 vrele(nd.ni_dvp); 2810 else 2811 vput(nd.ni_dvp); 2812 vrele(vp); 2813 return (EEXIST); 2814 } 2815 VATTR_NULL(&vattr); 2816 vattr.va_type = VDIR; 2817 vattr.va_mode = 2818 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2819 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2820 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2821 if (!error) 2822 vput(nd.ni_vp); 2823 return (error); 2824 } 2825 2826 /* 2827 * Remove a directory file. 2828 */ 2829 /* ARGSUSED */ 2830 int 2831 sys_rmdir(p, v, retval) 2832 struct proc *p; 2833 void *v; 2834 register_t *retval; 2835 { 2836 struct sys_rmdir_args /* { 2837 syscallarg(const char *) path; 2838 } */ *uap = v; 2839 register struct vnode *vp; 2840 int error; 2841 struct nameidata nd; 2842 2843 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2844 SCARG(uap, path), p); 2845 if ((error = namei(&nd)) != 0) 2846 return (error); 2847 vp = nd.ni_vp; 2848 if (vp->v_type != VDIR) { 2849 error = ENOTDIR; 2850 goto out; 2851 } 2852 /* 2853 * No rmdir "." please. 2854 */ 2855 if (nd.ni_dvp == vp) { 2856 error = EINVAL; 2857 goto out; 2858 } 2859 /* 2860 * The root of a mounted filesystem cannot be deleted. 2861 */ 2862 if (vp->v_flag & VROOT) 2863 error = EBUSY; 2864 out: 2865 if (!error) { 2866 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2867 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2868 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2869 } else { 2870 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2871 if (nd.ni_dvp == vp) 2872 vrele(nd.ni_dvp); 2873 else 2874 vput(nd.ni_dvp); 2875 vput(vp); 2876 } 2877 return (error); 2878 } 2879 2880 /* 2881 * Read a block of directory entries in a file system independent format. 2882 */ 2883 int 2884 sys_getdents(p, v, retval) 2885 struct proc *p; 2886 void *v; 2887 register_t *retval; 2888 { 2889 register struct sys_getdents_args /* { 2890 syscallarg(int) fd; 2891 syscallarg(char *) buf; 2892 syscallarg(size_t) count; 2893 } */ *uap = v; 2894 struct file *fp; 2895 int error, done; 2896 2897 /* getvnode() will use the descriptor for us */ 2898 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2899 return (error); 2900 if ((fp->f_flag & FREAD) == 0) { 2901 error = EBADF; 2902 goto out; 2903 } 2904 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2905 SCARG(uap, count), &done, p, 0, 0); 2906 *retval = done; 2907 out: 2908 FILE_UNUSE(fp, p); 2909 return (error); 2910 } 2911 2912 /* 2913 * Set the mode mask for creation of filesystem nodes. 2914 */ 2915 int 2916 sys_umask(p, v, retval) 2917 struct proc *p; 2918 void *v; 2919 register_t *retval; 2920 { 2921 struct sys_umask_args /* { 2922 syscallarg(mode_t) newmask; 2923 } */ *uap = v; 2924 struct cwdinfo *cwdi; 2925 2926 cwdi = p->p_cwdi; 2927 *retval = cwdi->cwdi_cmask; 2928 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2929 return (0); 2930 } 2931 2932 /* 2933 * Void all references to file by ripping underlying filesystem 2934 * away from vnode. 2935 */ 2936 /* ARGSUSED */ 2937 int 2938 sys_revoke(p, v, retval) 2939 struct proc *p; 2940 void *v; 2941 register_t *retval; 2942 { 2943 register struct sys_revoke_args /* { 2944 syscallarg(const char *) path; 2945 } */ *uap = v; 2946 register struct vnode *vp; 2947 struct vattr vattr; 2948 int error; 2949 struct nameidata nd; 2950 2951 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2952 if ((error = namei(&nd)) != 0) 2953 return (error); 2954 vp = nd.ni_vp; 2955 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2956 goto out; 2957 if (p->p_ucred->cr_uid != vattr.va_uid && 2958 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2959 goto out; 2960 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2961 VOP_REVOKE(vp, REVOKEALL); 2962 out: 2963 vrele(vp); 2964 return (error); 2965 } 2966 2967 /* 2968 * Convert a user file descriptor to a kernel file entry. 2969 */ 2970 int 2971 getvnode(fdp, fd, fpp) 2972 struct filedesc *fdp; 2973 int fd; 2974 struct file **fpp; 2975 { 2976 struct vnode *vp; 2977 struct file *fp; 2978 2979 if ((u_int)fd >= fdp->fd_nfiles || 2980 (fp = fdp->fd_ofiles[fd]) == NULL || 2981 (fp->f_iflags & FIF_WANTCLOSE) != 0) 2982 return (EBADF); 2983 2984 FILE_USE(fp); 2985 2986 if (fp->f_type != DTYPE_VNODE) { 2987 FILE_UNUSE(fp, NULL); 2988 return (EINVAL); 2989 } 2990 2991 vp = (struct vnode *)fp->f_data; 2992 if (vp->v_type == VBAD) { 2993 FILE_UNUSE(fp, NULL); 2994 return (EBADF); 2995 } 2996 2997 *fpp = fp; 2998 return (0); 2999 } 3000
Indexes created Mon Sep 22 05:09:51 GMT 2025