vfs_syscalls.c revision 1.140
1 /* $NetBSD: vfs_syscalls.c,v 1.140 1999/07/04 06:16:29 sommerfeld 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 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 366 cwdi = p->p_cwdi; 367 if (cwdi->cwdi_cdir == olddp) { 368 vrele(cwdi->cwdi_cdir); 369 VREF(newdp); 370 cwdi->cwdi_cdir = newdp; 371 } 372 if (cwdi->cwdi_rdir == olddp) { 373 vrele(cwdi->cwdi_rdir); 374 VREF(newdp); 375 cwdi->cwdi_rdir = newdp; 376 } 377 } 378 if (rootvnode == olddp) { 379 vrele(rootvnode); 380 VREF(newdp); 381 rootvnode = newdp; 382 } 383 vput(newdp); 384 } 385 386 /* 387 * Unmount a file system. 388 * 389 * Note: unmount takes a path to the vnode mounted on as argument, 390 * not special file (as before). 391 */ 392 /* ARGSUSED */ 393 int 394 sys_unmount(p, v, retval) 395 struct proc *p; 396 void *v; 397 register_t *retval; 398 { 399 register struct sys_unmount_args /* { 400 syscallarg(const char *) path; 401 syscallarg(int) flags; 402 } */ *uap = v; 403 register struct vnode *vp; 404 struct mount *mp; 405 int error; 406 struct nameidata nd; 407 408 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 409 SCARG(uap, path), p); 410 if ((error = namei(&nd)) != 0) 411 return (error); 412 vp = nd.ni_vp; 413 mp = vp->v_mount; 414 415 /* 416 * Only root, or the user that did the original mount is 417 * permitted to unmount this filesystem. 418 */ 419 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 420 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 421 vput(vp); 422 return (error); 423 } 424 425 /* 426 * Don't allow unmounting the root file system. 427 */ 428 if (mp->mnt_flag & MNT_ROOTFS) { 429 vput(vp); 430 return (EINVAL); 431 } 432 433 /* 434 * Must be the root of the filesystem 435 */ 436 if ((vp->v_flag & VROOT) == 0) { 437 vput(vp); 438 return (EINVAL); 439 } 440 vput(vp); 441 442 if (vfs_busy(mp, 0, 0)) 443 return (EBUSY); 444 445 return (dounmount(mp, SCARG(uap, flags), p)); 446 } 447 448 /* 449 * Do the actual file system unmount. File system is assumed to have been 450 * marked busy by the caller. 451 */ 452 int 453 dounmount(mp, flags, p) 454 register struct mount *mp; 455 int flags; 456 struct proc *p; 457 { 458 struct vnode *coveredvp; 459 int error; 460 int async; 461 462 simple_lock(&mountlist_slock); 463 mp->mnt_flag |= MNT_UNMOUNT; 464 vfs_unbusy(mp); 465 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 466 if (mp->mnt_flag & MNT_EXPUBLIC) 467 vfs_setpublicfs(NULL, NULL, NULL); 468 async = mp->mnt_flag & ASYNC; 469 mp->mnt_flag &=~ MNT_ASYNC; 470 cache_purgevfs(mp); /* remove cache entries for this file sys */ 471 if (((mp->mnt_flag & MNT_RDONLY) || 472 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 473 (flags & MNT_FORCE)) 474 error = VFS_UNMOUNT(mp, flags, p); 475 simple_lock(&mountlist_slock); 476 if (error) { 477 mp->mnt_flag &= ~MNT_UNMOUNT; 478 mp->mnt_flag |= async; 479 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 480 &mountlist_slock); 481 if (mp->mnt_flag & MNT_MWAIT) 482 wakeup((caddr_t)mp); 483 return (error); 484 } 485 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 486 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 487 coveredvp->v_mountedhere = NULL; 488 vrele(coveredvp); 489 } 490 mp->mnt_op->vfs_refcount--; 491 if (mp->mnt_vnodelist.lh_first != NULL) 492 panic("unmount: dangling vnode"); 493 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 494 if (mp->mnt_flag & MNT_MWAIT) 495 wakeup((caddr_t)mp); 496 free((caddr_t)mp, M_MOUNT); 497 return (0); 498 } 499 500 /* 501 * Sync each mounted filesystem. 502 */ 503 #ifdef DEBUG 504 int syncprt = 0; 505 struct ctldebug debug0 = { "syncprt", &syncprt }; 506 #endif 507 508 /* ARGSUSED */ 509 int 510 sys_sync(p, v, retval) 511 struct proc *p; 512 void *v; 513 register_t *retval; 514 { 515 register struct mount *mp, *nmp; 516 int asyncflag; 517 518 simple_lock(&mountlist_slock); 519 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 520 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 521 nmp = mp->mnt_list.cqe_prev; 522 continue; 523 } 524 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 525 asyncflag = mp->mnt_flag & MNT_ASYNC; 526 mp->mnt_flag &= ~MNT_ASYNC; 527 uvm_vnp_sync(mp); 528 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 529 if (asyncflag) 530 mp->mnt_flag |= MNT_ASYNC; 531 } 532 simple_lock(&mountlist_slock); 533 nmp = mp->mnt_list.cqe_prev; 534 vfs_unbusy(mp); 535 536 } 537 simple_unlock(&mountlist_slock); 538 #ifdef DEBUG 539 if (syncprt) 540 vfs_bufstats(); 541 #endif /* DEBUG */ 542 return (0); 543 } 544 545 /* 546 * Change filesystem quotas. 547 */ 548 /* ARGSUSED */ 549 int 550 sys_quotactl(p, v, retval) 551 struct proc *p; 552 void *v; 553 register_t *retval; 554 { 555 register struct sys_quotactl_args /* { 556 syscallarg(const char *) path; 557 syscallarg(int) cmd; 558 syscallarg(int) uid; 559 syscallarg(caddr_t) arg; 560 } */ *uap = v; 561 register struct mount *mp; 562 int error; 563 struct nameidata nd; 564 565 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 566 if ((error = namei(&nd)) != 0) 567 return (error); 568 mp = nd.ni_vp->v_mount; 569 vrele(nd.ni_vp); 570 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 571 SCARG(uap, arg), p)); 572 } 573 574 /* 575 * Get filesystem statistics. 576 */ 577 /* ARGSUSED */ 578 int 579 sys_statfs(p, v, retval) 580 struct proc *p; 581 void *v; 582 register_t *retval; 583 { 584 register struct sys_statfs_args /* { 585 syscallarg(const char *) path; 586 syscallarg(struct statfs *) buf; 587 } */ *uap = v; 588 register struct mount *mp; 589 register struct statfs *sp; 590 int error; 591 struct nameidata nd; 592 593 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 594 if ((error = namei(&nd)) != 0) 595 return (error); 596 mp = nd.ni_vp->v_mount; 597 sp = &mp->mnt_stat; 598 vrele(nd.ni_vp); 599 if ((error = VFS_STATFS(mp, sp, p)) != 0) 600 return (error); 601 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 602 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 603 } 604 605 /* 606 * Get filesystem statistics. 607 */ 608 /* ARGSUSED */ 609 int 610 sys_fstatfs(p, v, retval) 611 struct proc *p; 612 void *v; 613 register_t *retval; 614 { 615 register struct sys_fstatfs_args /* { 616 syscallarg(int) fd; 617 syscallarg(struct statfs *) buf; 618 } */ *uap = v; 619 struct file *fp; 620 struct mount *mp; 621 register struct statfs *sp; 622 int error; 623 624 /* getvnode() will use the descriptor for us */ 625 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 626 return (error); 627 mp = ((struct vnode *)fp->f_data)->v_mount; 628 sp = &mp->mnt_stat; 629 if ((error = VFS_STATFS(mp, sp, p)) != 0) 630 goto out; 631 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 632 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 633 out: 634 FILE_UNUSE(fp, p); 635 return (error); 636 } 637 638 /* 639 * Get statistics on all filesystems. 640 */ 641 int 642 sys_getfsstat(p, v, retval) 643 struct proc *p; 644 void *v; 645 register_t *retval; 646 { 647 register struct sys_getfsstat_args /* { 648 syscallarg(struct statfs *) buf; 649 syscallarg(long) bufsize; 650 syscallarg(int) flags; 651 } */ *uap = v; 652 register struct mount *mp, *nmp; 653 register struct statfs *sp; 654 caddr_t sfsp; 655 long count, maxcount, error; 656 657 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 658 sfsp = (caddr_t)SCARG(uap, buf); 659 simple_lock(&mountlist_slock); 660 count = 0; 661 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 662 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 663 nmp = mp->mnt_list.cqe_next; 664 continue; 665 } 666 if (sfsp && count < maxcount) { 667 sp = &mp->mnt_stat; 668 /* 669 * If MNT_NOWAIT is specified, do not refresh the 670 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 671 */ 672 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 673 (SCARG(uap, flags) & MNT_WAIT)) && 674 (error = VFS_STATFS(mp, sp, p)) != 0) { 675 simple_lock(&mountlist_slock); 676 nmp = mp->mnt_list.cqe_next; 677 vfs_unbusy(mp); 678 continue; 679 } 680 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 681 error = copyout(sp, sfsp, sizeof(*sp)); 682 if (error) { 683 vfs_unbusy(mp); 684 return (error); 685 } 686 sfsp += sizeof(*sp); 687 } 688 count++; 689 simple_lock(&mountlist_slock); 690 nmp = mp->mnt_list.cqe_next; 691 vfs_unbusy(mp); 692 } 693 simple_unlock(&mountlist_slock); 694 if (sfsp && count > maxcount) 695 *retval = maxcount; 696 else 697 *retval = count; 698 return (0); 699 } 700 701 /* 702 * Change current working directory to a given file descriptor. 703 */ 704 /* ARGSUSED */ 705 int 706 sys_fchdir(p, v, retval) 707 struct proc *p; 708 void *v; 709 register_t *retval; 710 { 711 struct sys_fchdir_args /* { 712 syscallarg(int) fd; 713 } */ *uap = v; 714 struct filedesc *fdp = p->p_fd; 715 struct cwdinfo *cwdi = p->p_cwdi; 716 struct vnode *vp, *tdp; 717 struct mount *mp; 718 struct file *fp; 719 int error; 720 721 /* getvnode() will use the descriptor for us */ 722 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 723 return (error); 724 vp = (struct vnode *)fp->f_data; 725 726 VREF(vp); 727 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 728 if (vp->v_type != VDIR) 729 error = ENOTDIR; 730 else 731 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 732 while (!error && (mp = vp->v_mountedhere) != NULL) { 733 if (vfs_busy(mp, 0, 0)) 734 continue; 735 error = VFS_ROOT(mp, &tdp); 736 vfs_unbusy(mp); 737 if (error) 738 break; 739 vput(vp); 740 vp = tdp; 741 } 742 if (error) { 743 vput(vp); 744 goto out; 745 } 746 VOP_UNLOCK(vp, 0); 747 748 /* 749 * Disallow changing to a directory not under the process's 750 * current root directory (if there is one). 751 */ 752 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 753 vrele(vp); 754 error = EPERM; /* operation not permitted */ 755 goto out; 756 } 757 758 vrele(cwdi->cwdi_cdir); 759 cwdi->cwdi_cdir = vp; 760 out: 761 FILE_UNUSE(fp, p); 762 return (error); 763 } 764 765 /* 766 * Change this process's notion of the root directory to a given file descriptor. 767 */ 768 769 int 770 sys_fchroot(p, v, retval) 771 struct proc *p; 772 void *v; 773 register_t *retval; 774 { 775 struct sys_fchroot_args *uap = v; 776 struct filedesc *fdp = p->p_fd; 777 struct cwdinfo *cwdi = p->p_cwdi; 778 struct vnode *vp; 779 struct file *fp; 780 int error; 781 782 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 783 return error; 784 /* getvnode() will use the descriptor for us */ 785 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 786 return error; 787 vp = (struct vnode *) fp->f_data; 788 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 789 if (vp->v_type != VDIR) 790 error = ENOTDIR; 791 else 792 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 793 VOP_UNLOCK(vp, 0); 794 if (error) 795 goto out; 796 VREF(vp); 797 798 /* 799 * Prevent escaping from chroot by putting the root under 800 * the working directory. Silently chdir to / if we aren't 801 * already there. 802 */ 803 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 804 /* 805 * XXX would be more failsafe to change directory to a 806 * deadfs node here instead 807 */ 808 vrele(cwdi->cwdi_cdir); 809 VREF(vp); 810 cwdi->cwdi_cdir = vp; 811 } 812 813 if (cwdi->cwdi_rdir != NULL) 814 vrele(cwdi->cwdi_rdir); 815 cwdi->cwdi_rdir = vp; 816 out: 817 FILE_UNUSE(fp, p); 818 return (error); 819 } 820 821 822 823 /* 824 * Change current working directory (``.''). 825 */ 826 /* ARGSUSED */ 827 int 828 sys_chdir(p, v, retval) 829 struct proc *p; 830 void *v; 831 register_t *retval; 832 { 833 struct sys_chdir_args /* { 834 syscallarg(const char *) path; 835 } */ *uap = v; 836 struct cwdinfo *cwdi = p->p_cwdi; 837 int error; 838 struct nameidata nd; 839 840 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 841 SCARG(uap, path), p); 842 if ((error = change_dir(&nd, p)) != 0) 843 return (error); 844 vrele(cwdi->cwdi_cdir); 845 cwdi->cwdi_cdir = nd.ni_vp; 846 return (0); 847 } 848 849 /* 850 * Change notion of root (``/'') directory. 851 */ 852 /* ARGSUSED */ 853 int 854 sys_chroot(p, v, retval) 855 struct proc *p; 856 void *v; 857 register_t *retval; 858 { 859 struct sys_chroot_args /* { 860 syscallarg(const char *) path; 861 } */ *uap = v; 862 struct cwdinfo *cwdi = p->p_cwdi; 863 struct vnode *vp; 864 int error; 865 struct nameidata nd; 866 867 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 868 return (error); 869 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 870 SCARG(uap, path), p); 871 if ((error = change_dir(&nd, p)) != 0) 872 return (error); 873 if (cwdi->cwdi_rdir != NULL) 874 vrele(cwdi->cwdi_rdir); 875 vp = nd.ni_vp; 876 cwdi->cwdi_rdir = vp; 877 878 /* 879 * Prevent escaping from chroot by putting the root under 880 * the working directory. Silently chdir to / if we aren't 881 * already there. 882 */ 883 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 884 /* 885 * XXX would be more failsafe to change directory to a 886 * deadfs node here instead 887 */ 888 vrele(cwdi->cwdi_cdir); 889 VREF(vp); 890 cwdi->cwdi_cdir = vp; 891 } 892 893 return (0); 894 } 895 896 /* 897 * Common routine for chroot and chdir. 898 */ 899 static int 900 change_dir(ndp, p) 901 register struct nameidata *ndp; 902 struct proc *p; 903 { 904 struct vnode *vp; 905 int error; 906 907 if ((error = namei(ndp)) != 0) 908 return (error); 909 vp = ndp->ni_vp; 910 if (vp->v_type != VDIR) 911 error = ENOTDIR; 912 else 913 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 914 915 if (error) 916 vput(vp); 917 else 918 VOP_UNLOCK(vp, 0); 919 return (error); 920 } 921 922 /* 923 * Check permissions, allocate an open file structure, 924 * and call the device open routine if any. 925 */ 926 int 927 sys_open(p, v, retval) 928 struct proc *p; 929 void *v; 930 register_t *retval; 931 { 932 register struct sys_open_args /* { 933 syscallarg(const char *) path; 934 syscallarg(int) flags; 935 syscallarg(int) mode; 936 } */ *uap = v; 937 struct cwdinfo *cwdi = p->p_cwdi; 938 struct filedesc *fdp = p->p_fd; 939 struct file *fp; 940 struct vnode *vp; 941 int flags, cmode; 942 int type, indx, error; 943 struct flock lf; 944 struct nameidata nd; 945 extern struct fileops vnops; 946 947 flags = FFLAGS(SCARG(uap, flags)); 948 if ((flags & (FREAD | FWRITE)) == 0) 949 return (EINVAL); 950 /* falloc() will use the file descriptor for us */ 951 if ((error = falloc(p, &fp, &indx)) != 0) 952 return (error); 953 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 954 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 955 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 956 if ((error = vn_open(&nd, flags, cmode)) != 0) { 957 FILE_UNUSE(fp, p); 958 ffree(fp); 959 if ((error == ENODEV || error == ENXIO) && 960 p->p_dupfd >= 0 && /* XXX from fdopen */ 961 (error = 962 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 963 *retval = indx; 964 return (0); 965 } 966 if (error == ERESTART) 967 error = EINTR; 968 fdp->fd_ofiles[indx] = NULL; 969 return (error); 970 } 971 p->p_dupfd = 0; 972 vp = nd.ni_vp; 973 fp->f_flag = flags & FMASK; 974 fp->f_type = DTYPE_VNODE; 975 fp->f_ops = &vnops; 976 fp->f_data = (caddr_t)vp; 977 if (flags & (O_EXLOCK | O_SHLOCK)) { 978 lf.l_whence = SEEK_SET; 979 lf.l_start = 0; 980 lf.l_len = 0; 981 if (flags & O_EXLOCK) 982 lf.l_type = F_WRLCK; 983 else 984 lf.l_type = F_RDLCK; 985 type = F_FLOCK; 986 if ((flags & FNONBLOCK) == 0) 987 type |= F_WAIT; 988 VOP_UNLOCK(vp, 0); 989 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 990 if (error) { 991 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 992 FILE_UNUSE(fp, p); 993 ffree(fp); 994 fdp->fd_ofiles[indx] = NULL; 995 return (error); 996 } 997 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 998 fp->f_flag |= FHASLOCK; 999 } 1000 VOP_UNLOCK(vp, 0); 1001 *retval = indx; 1002 FILE_UNUSE(fp, p); 1003 return (0); 1004 } 1005 1006 /* 1007 * Get file handle system call 1008 */ 1009 int 1010 sys_getfh(p, v, retval) 1011 struct proc *p; 1012 register void *v; 1013 register_t *retval; 1014 { 1015 register struct sys_getfh_args /* { 1016 syscallarg(char *) fname; 1017 syscallarg(fhandle_t *) fhp; 1018 } */ *uap = v; 1019 register struct vnode *vp; 1020 fhandle_t fh; 1021 int error; 1022 struct nameidata nd; 1023 1024 /* 1025 * Must be super user 1026 */ 1027 error = suser(p->p_ucred, &p->p_acflag); 1028 if (error) 1029 return (error); 1030 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1031 SCARG(uap, fname), p); 1032 error = namei(&nd); 1033 if (error) 1034 return (error); 1035 vp = nd.ni_vp; 1036 memset((caddr_t)&fh, 0, sizeof(fh)); 1037 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1038 error = VFS_VPTOFH(vp, &fh.fh_fid); 1039 vput(vp); 1040 if (error) 1041 return (error); 1042 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1043 return (error); 1044 } 1045 1046 /* 1047 * Open a file given a file handle. 1048 * 1049 * Check permissions, allocate an open file structure, 1050 * and call the device open routine if any. 1051 */ 1052 int 1053 sys_fhopen(p, v, retval) 1054 struct proc *p; 1055 void *v; 1056 register_t *retval; 1057 { 1058 register struct sys_fhopen_args /* { 1059 syscallarg(const fhandle_t *) fhp; 1060 syscallarg(int) flags; 1061 } */ *uap = v; 1062 struct filedesc *fdp = p->p_fd; 1063 struct file *fp; 1064 struct vnode *vp = NULL; 1065 struct mount *mp; 1066 struct ucred *cred = p->p_ucred; 1067 int flags; 1068 struct file *nfp; 1069 int type, indx, error=0; 1070 struct flock lf; 1071 struct vattr va; 1072 fhandle_t fh; 1073 extern struct fileops vnops; 1074 1075 /* 1076 * Must be super user 1077 */ 1078 if ((error = suser(p->p_ucred, &p->p_acflag))) 1079 return (error); 1080 1081 flags = FFLAGS(SCARG(uap, flags)); 1082 if ((flags & (FREAD | FWRITE)) == 0) 1083 return (EINVAL); 1084 if ((flags & O_CREAT)) 1085 return (EINVAL); 1086 /* falloc() will use the file descriptor for us */ 1087 if ((error = falloc(p, &nfp, &indx)) != 0) 1088 return (error); 1089 fp = nfp; 1090 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1091 goto bad; 1092 1093 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1094 error = ESTALE; 1095 goto bad; 1096 } 1097 1098 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1099 vp = NULL; /* most likely unnecessary sanity for bad: */ 1100 goto bad; 1101 } 1102 1103 /* Now do an effective vn_open */ 1104 1105 if (vp->v_type == VSOCK) { 1106 error = EOPNOTSUPP; 1107 goto bad; 1108 } 1109 if (flags & FREAD) { 1110 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1111 goto bad; 1112 } 1113 if (flags & (FWRITE | O_TRUNC)) { 1114 if (vp->v_type == VDIR) { 1115 error = EISDIR; 1116 goto bad; 1117 } 1118 if ((error = vn_writechk(vp)) != 0 || 1119 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1120 goto bad; 1121 } 1122 if (flags & O_TRUNC) { 1123 VOP_UNLOCK(vp, 0); /* XXX */ 1124 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1125 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1126 VATTR_NULL(&va); 1127 va.va_size = 0; 1128 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1129 goto bad; 1130 } 1131 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1132 goto bad; 1133 if (flags & FWRITE) 1134 vp->v_writecount++; 1135 1136 /* done with modified vn_open, now finish what sys_open does. */ 1137 1138 fp->f_flag = flags & FMASK; 1139 fp->f_type = DTYPE_VNODE; 1140 fp->f_ops = &vnops; 1141 fp->f_data = (caddr_t)vp; 1142 if (flags & (O_EXLOCK | O_SHLOCK)) { 1143 lf.l_whence = SEEK_SET; 1144 lf.l_start = 0; 1145 lf.l_len = 0; 1146 if (flags & O_EXLOCK) 1147 lf.l_type = F_WRLCK; 1148 else 1149 lf.l_type = F_RDLCK; 1150 type = F_FLOCK; 1151 if ((flags & FNONBLOCK) == 0) 1152 type |= F_WAIT; 1153 VOP_UNLOCK(vp, 0); 1154 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1155 if (error) { 1156 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1157 FILE_UNUSE(fp, p); 1158 ffree(fp); 1159 fdp->fd_ofiles[indx] = NULL; 1160 return (error); 1161 } 1162 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1163 fp->f_flag |= FHASLOCK; 1164 } 1165 VOP_UNLOCK(vp, 0); 1166 *retval = indx; 1167 FILE_UNUSE(fp, p); 1168 return (0); 1169 1170 bad: 1171 FILE_UNUSE(fp, p); 1172 ffree(fp); 1173 fdp->fd_ofiles[indx] = NULL; 1174 if (vp != NULL) 1175 vput(vp); 1176 return (error); 1177 } 1178 1179 /* ARGSUSED */ 1180 int 1181 sys_fhstat(p, v, retval) 1182 struct proc *p; 1183 void *v; 1184 register_t *retval; 1185 { 1186 register struct sys_fhstat_args /* { 1187 syscallarg(const fhandle_t *) fhp; 1188 syscallarg(struct stat *) sb; 1189 } */ *uap = v; 1190 struct stat sb; 1191 int error; 1192 fhandle_t fh; 1193 struct mount *mp; 1194 struct vnode *vp; 1195 1196 /* 1197 * Must be super user 1198 */ 1199 if ((error = suser(p->p_ucred, &p->p_acflag))) 1200 return (error); 1201 1202 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1203 return (error); 1204 1205 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1206 return (ESTALE); 1207 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1208 return (error); 1209 error = vn_stat(vp, &sb, p); 1210 vput(vp); 1211 if (error) 1212 return (error); 1213 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1214 return (error); 1215 } 1216 1217 /* ARGSUSED */ 1218 int 1219 sys_fhstatfs(p, v, retval) 1220 struct proc *p; 1221 void *v; 1222 register_t *retval; 1223 { 1224 register struct sys_fhstatfs_args /* 1225 syscallarg(const fhandle_t *) fhp; 1226 syscallarg(struct statfs *) buf; 1227 } */ *uap = v; 1228 struct statfs sp; 1229 fhandle_t fh; 1230 struct mount *mp; 1231 struct vnode *vp; 1232 int error; 1233 1234 /* 1235 * Must be super user 1236 */ 1237 if ((error = suser(p->p_ucred, &p->p_acflag))) 1238 return (error); 1239 1240 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1241 return (error); 1242 1243 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1244 return (ESTALE); 1245 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1246 return (error); 1247 mp = vp->v_mount; 1248 vput(vp); 1249 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1250 return (error); 1251 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1252 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1253 } 1254 1255 /* 1256 * Create a special file. 1257 */ 1258 /* ARGSUSED */ 1259 int 1260 sys_mknod(p, v, retval) 1261 struct proc *p; 1262 void *v; 1263 register_t *retval; 1264 { 1265 register struct sys_mknod_args /* { 1266 syscallarg(const char *) path; 1267 syscallarg(int) mode; 1268 syscallarg(int) dev; 1269 } */ *uap = v; 1270 register struct vnode *vp; 1271 struct vattr vattr; 1272 int error; 1273 int whiteout = 0; 1274 struct nameidata nd; 1275 1276 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1277 return (error); 1278 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1279 if ((error = namei(&nd)) != 0) 1280 return (error); 1281 vp = nd.ni_vp; 1282 if (vp != NULL) 1283 error = EEXIST; 1284 else { 1285 VATTR_NULL(&vattr); 1286 vattr.va_mode = 1287 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1288 vattr.va_rdev = SCARG(uap, dev); 1289 whiteout = 0; 1290 1291 switch (SCARG(uap, mode) & S_IFMT) { 1292 case S_IFMT: /* used by badsect to flag bad sectors */ 1293 vattr.va_type = VBAD; 1294 break; 1295 case S_IFCHR: 1296 vattr.va_type = VCHR; 1297 break; 1298 case S_IFBLK: 1299 vattr.va_type = VBLK; 1300 break; 1301 case S_IFWHT: 1302 whiteout = 1; 1303 break; 1304 default: 1305 error = EINVAL; 1306 break; 1307 } 1308 } 1309 if (!error) { 1310 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1311 if (whiteout) { 1312 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1313 if (error) 1314 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1315 vput(nd.ni_dvp); 1316 } else { 1317 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1318 &nd.ni_cnd, &vattr); 1319 } 1320 } else { 1321 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1322 if (nd.ni_dvp == vp) 1323 vrele(nd.ni_dvp); 1324 else 1325 vput(nd.ni_dvp); 1326 if (vp) 1327 vrele(vp); 1328 } 1329 return (error); 1330 } 1331 1332 /* 1333 * Create a named pipe. 1334 */ 1335 /* ARGSUSED */ 1336 int 1337 sys_mkfifo(p, v, retval) 1338 struct proc *p; 1339 void *v; 1340 register_t *retval; 1341 { 1342 register struct sys_mkfifo_args /* { 1343 syscallarg(const char *) path; 1344 syscallarg(int) mode; 1345 } */ *uap = v; 1346 struct vattr vattr; 1347 int error; 1348 struct nameidata nd; 1349 1350 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1351 if ((error = namei(&nd)) != 0) 1352 return (error); 1353 if (nd.ni_vp != NULL) { 1354 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1355 if (nd.ni_dvp == nd.ni_vp) 1356 vrele(nd.ni_dvp); 1357 else 1358 vput(nd.ni_dvp); 1359 vrele(nd.ni_vp); 1360 return (EEXIST); 1361 } 1362 VATTR_NULL(&vattr); 1363 vattr.va_type = VFIFO; 1364 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1365 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1366 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1367 } 1368 1369 /* 1370 * Make a hard file link. 1371 */ 1372 /* ARGSUSED */ 1373 int 1374 sys_link(p, v, retval) 1375 struct proc *p; 1376 void *v; 1377 register_t *retval; 1378 { 1379 register struct sys_link_args /* { 1380 syscallarg(const char *) path; 1381 syscallarg(const char *) link; 1382 } */ *uap = v; 1383 register struct vnode *vp; 1384 struct nameidata nd; 1385 int error; 1386 1387 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1388 if ((error = namei(&nd)) != 0) 1389 return (error); 1390 vp = nd.ni_vp; 1391 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1392 if ((error = namei(&nd)) != 0) 1393 goto out; 1394 if (nd.ni_vp) { 1395 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1396 if (nd.ni_dvp == nd.ni_vp) 1397 vrele(nd.ni_dvp); 1398 else 1399 vput(nd.ni_dvp); 1400 vrele(nd.ni_vp); 1401 error = EEXIST; 1402 goto out; 1403 } 1404 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1405 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1406 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1407 out: 1408 vrele(vp); 1409 return (error); 1410 } 1411 1412 /* 1413 * Make a symbolic link. 1414 */ 1415 /* ARGSUSED */ 1416 int 1417 sys_symlink(p, v, retval) 1418 struct proc *p; 1419 void *v; 1420 register_t *retval; 1421 { 1422 register struct sys_symlink_args /* { 1423 syscallarg(const char *) path; 1424 syscallarg(const char *) link; 1425 } */ *uap = v; 1426 struct vattr vattr; 1427 char *path; 1428 int error; 1429 struct nameidata nd; 1430 1431 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1432 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1433 if (error) 1434 goto out; 1435 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1436 if ((error = namei(&nd)) != 0) 1437 goto out; 1438 if (nd.ni_vp) { 1439 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1440 if (nd.ni_dvp == nd.ni_vp) 1441 vrele(nd.ni_dvp); 1442 else 1443 vput(nd.ni_dvp); 1444 vrele(nd.ni_vp); 1445 error = EEXIST; 1446 goto out; 1447 } 1448 VATTR_NULL(&vattr); 1449 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1450 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1451 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1452 out: 1453 FREE(path, M_NAMEI); 1454 return (error); 1455 } 1456 1457 /* 1458 * Delete a whiteout from the filesystem. 1459 */ 1460 /* ARGSUSED */ 1461 int 1462 sys_undelete(p, v, retval) 1463 struct proc *p; 1464 void *v; 1465 register_t *retval; 1466 { 1467 register struct sys_undelete_args /* { 1468 syscallarg(const char *) path; 1469 } */ *uap = v; 1470 int error; 1471 struct nameidata nd; 1472 1473 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1474 SCARG(uap, path), p); 1475 error = namei(&nd); 1476 if (error) 1477 return (error); 1478 1479 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1480 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1481 if (nd.ni_dvp == nd.ni_vp) 1482 vrele(nd.ni_dvp); 1483 else 1484 vput(nd.ni_dvp); 1485 if (nd.ni_vp) 1486 vrele(nd.ni_vp); 1487 return (EEXIST); 1488 } 1489 1490 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1491 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1492 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1493 vput(nd.ni_dvp); 1494 return (error); 1495 } 1496 1497 /* 1498 * Delete a name from the filesystem. 1499 */ 1500 /* ARGSUSED */ 1501 int 1502 sys_unlink(p, v, retval) 1503 struct proc *p; 1504 void *v; 1505 register_t *retval; 1506 { 1507 struct sys_unlink_args /* { 1508 syscallarg(const char *) path; 1509 } */ *uap = v; 1510 register struct vnode *vp; 1511 int error; 1512 struct nameidata nd; 1513 1514 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1515 SCARG(uap, path), p); 1516 if ((error = namei(&nd)) != 0) 1517 return (error); 1518 vp = nd.ni_vp; 1519 1520 /* 1521 * The root of a mounted filesystem cannot be deleted. 1522 */ 1523 if (vp->v_flag & VROOT) { 1524 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1525 if (nd.ni_dvp == vp) 1526 vrele(nd.ni_dvp); 1527 else 1528 vput(nd.ni_dvp); 1529 vput(vp); 1530 error = EBUSY; 1531 goto out; 1532 } 1533 1534 (void)uvm_vnp_uncache(vp); 1535 1536 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1537 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1538 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1539 out: 1540 return (error); 1541 } 1542 1543 /* 1544 * Reposition read/write file offset. 1545 */ 1546 int 1547 sys_lseek(p, v, retval) 1548 struct proc *p; 1549 void *v; 1550 register_t *retval; 1551 { 1552 register struct sys_lseek_args /* { 1553 syscallarg(int) fd; 1554 syscallarg(int) pad; 1555 syscallarg(off_t) offset; 1556 syscallarg(int) whence; 1557 } */ *uap = v; 1558 struct ucred *cred = p->p_ucred; 1559 register struct filedesc *fdp = p->p_fd; 1560 register struct file *fp; 1561 struct vnode *vp; 1562 struct vattr vattr; 1563 register off_t newoff; 1564 int error; 1565 1566 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1567 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1568 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1569 return (EBADF); 1570 1571 FILE_USE(fp); 1572 1573 vp = (struct vnode *)fp->f_data; 1574 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1575 error = ESPIPE; 1576 goto out; 1577 } 1578 1579 switch (SCARG(uap, whence)) { 1580 case SEEK_CUR: 1581 newoff = fp->f_offset + SCARG(uap, offset); 1582 break; 1583 case SEEK_END: 1584 error = VOP_GETATTR(vp, &vattr, cred, p); 1585 if (error) 1586 goto out; 1587 newoff = SCARG(uap, offset) + vattr.va_size; 1588 break; 1589 case SEEK_SET: 1590 newoff = SCARG(uap, offset); 1591 break; 1592 default: 1593 error = EINVAL; 1594 goto out; 1595 } 1596 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1597 goto out; 1598 1599 *(off_t *)retval = fp->f_offset = newoff; 1600 out: 1601 FILE_UNUSE(fp, p); 1602 return (error); 1603 } 1604 1605 /* 1606 * Positional read system call. 1607 */ 1608 int 1609 sys_pread(p, v, retval) 1610 struct proc *p; 1611 void *v; 1612 register_t *retval; 1613 { 1614 struct sys_pread_args /* { 1615 syscallarg(int) fd; 1616 syscallarg(void *) buf; 1617 syscallarg(size_t) nbyte; 1618 syscallarg(off_t) offset; 1619 } */ *uap = v; 1620 struct filedesc *fdp = p->p_fd; 1621 struct file *fp; 1622 struct vnode *vp; 1623 off_t offset; 1624 int error, fd = SCARG(uap, fd); 1625 1626 if ((u_int)fd >= fdp->fd_nfiles || 1627 (fp = fdp->fd_ofiles[fd]) == NULL || 1628 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1629 (fp->f_flag & FREAD) == 0) 1630 return (EBADF); 1631 1632 FILE_USE(fp); 1633 1634 vp = (struct vnode *)fp->f_data; 1635 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1636 error = ESPIPE; 1637 goto out; 1638 } 1639 1640 offset = SCARG(uap, offset); 1641 1642 /* 1643 * XXX This works because no file systems actually 1644 * XXX take any action on the seek operation. 1645 */ 1646 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1647 goto out; 1648 1649 /* dofileread() will unuse the descriptor for us */ 1650 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1651 &offset, 0, retval)); 1652 1653 out: 1654 FILE_UNUSE(fp, p); 1655 return (error); 1656 } 1657 1658 /* 1659 * Positional scatter read system call. 1660 */ 1661 int 1662 sys_preadv(p, v, retval) 1663 struct proc *p; 1664 void *v; 1665 register_t *retval; 1666 { 1667 struct sys_preadv_args /* { 1668 syscallarg(int) fd; 1669 syscallarg(const struct iovec *) iovp; 1670 syscallarg(int) iovcnt; 1671 syscallarg(off_t) offset; 1672 } */ *uap = v; 1673 struct filedesc *fdp = p->p_fd; 1674 struct file *fp; 1675 struct vnode *vp; 1676 off_t offset; 1677 int error, fd = SCARG(uap, fd); 1678 1679 if ((u_int)fd >= fdp->fd_nfiles || 1680 (fp = fdp->fd_ofiles[fd]) == NULL || 1681 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1682 (fp->f_flag & FREAD) == 0) 1683 return (EBADF); 1684 1685 FILE_USE(fp); 1686 1687 vp = (struct vnode *)fp->f_data; 1688 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1689 error = ESPIPE; 1690 goto out; 1691 } 1692 1693 offset = SCARG(uap, offset); 1694 1695 /* 1696 * XXX This works because no file systems actually 1697 * XXX take any action on the seek operation. 1698 */ 1699 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1700 goto out; 1701 1702 /* dofilereadv() will unuse the descriptor for us */ 1703 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1704 &offset, 0, retval)); 1705 1706 out: 1707 FILE_UNUSE(fp, p); 1708 return (error); 1709 } 1710 1711 /* 1712 * Positional write system call. 1713 */ 1714 int 1715 sys_pwrite(p, v, retval) 1716 struct proc *p; 1717 void *v; 1718 register_t *retval; 1719 { 1720 struct sys_pwrite_args /* { 1721 syscallarg(int) fd; 1722 syscallarg(const void *) buf; 1723 syscallarg(size_t) nbyte; 1724 syscallarg(off_t) offset; 1725 } */ *uap = v; 1726 struct filedesc *fdp = p->p_fd; 1727 struct file *fp; 1728 struct vnode *vp; 1729 off_t offset; 1730 int error, fd = SCARG(uap, fd); 1731 1732 if ((u_int)fd >= fdp->fd_nfiles || 1733 (fp = fdp->fd_ofiles[fd]) == NULL || 1734 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1735 (fp->f_flag & FWRITE) == 0) 1736 return (EBADF); 1737 1738 FILE_USE(fp); 1739 1740 vp = (struct vnode *)fp->f_data; 1741 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1742 error = ESPIPE; 1743 goto out; 1744 } 1745 1746 offset = SCARG(uap, offset); 1747 1748 /* 1749 * XXX This works because no file systems actually 1750 * XXX take any action on the seek operation. 1751 */ 1752 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1753 goto out; 1754 1755 /* dofilewrite() will unuse the descriptor for us */ 1756 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1757 &offset, 0, retval)); 1758 1759 out: 1760 FILE_UNUSE(fp, p); 1761 return (error); 1762 } 1763 1764 /* 1765 * Positional gather write system call. 1766 */ 1767 int 1768 sys_pwritev(p, v, retval) 1769 struct proc *p; 1770 void *v; 1771 register_t *retval; 1772 { 1773 struct sys_pwritev_args /* { 1774 syscallarg(int) fd; 1775 syscallarg(const struct iovec *) iovp; 1776 syscallarg(int) iovcnt; 1777 syscallarg(off_t) offset; 1778 } */ *uap = v; 1779 struct filedesc *fdp = p->p_fd; 1780 struct file *fp; 1781 struct vnode *vp; 1782 off_t offset; 1783 int error, fd = SCARG(uap, fd); 1784 1785 if ((u_int)fd >= fdp->fd_nfiles || 1786 (fp = fdp->fd_ofiles[fd]) == NULL || 1787 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1788 (fp->f_flag & FWRITE) == 0) 1789 return (EBADF); 1790 1791 FILE_USE(fp); 1792 1793 vp = (struct vnode *)fp->f_data; 1794 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1795 error = ESPIPE; 1796 goto out; 1797 } 1798 1799 offset = SCARG(uap, offset); 1800 1801 /* 1802 * XXX This works because no file systems actually 1803 * XXX take any action on the seek operation. 1804 */ 1805 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1806 goto out; 1807 1808 /* dofilewritev() will unuse the descriptor for us */ 1809 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1810 &offset, 0, retval)); 1811 1812 out: 1813 FILE_UNUSE(fp, p); 1814 return (error); 1815 } 1816 1817 /* 1818 * Check access permissions. 1819 */ 1820 int 1821 sys_access(p, v, retval) 1822 struct proc *p; 1823 void *v; 1824 register_t *retval; 1825 { 1826 register struct sys_access_args /* { 1827 syscallarg(const char *) path; 1828 syscallarg(int) flags; 1829 } */ *uap = v; 1830 register struct ucred *cred = p->p_ucred; 1831 register struct vnode *vp; 1832 int error, flags, t_gid, t_uid; 1833 struct nameidata nd; 1834 1835 t_uid = cred->cr_uid; 1836 t_gid = cred->cr_gid; 1837 cred->cr_uid = p->p_cred->p_ruid; 1838 cred->cr_gid = p->p_cred->p_rgid; 1839 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1840 SCARG(uap, path), p); 1841 if ((error = namei(&nd)) != 0) 1842 goto out1; 1843 vp = nd.ni_vp; 1844 1845 /* Flags == 0 means only check for existence. */ 1846 if (SCARG(uap, flags)) { 1847 flags = 0; 1848 if (SCARG(uap, flags) & R_OK) 1849 flags |= VREAD; 1850 if (SCARG(uap, flags) & W_OK) 1851 flags |= VWRITE; 1852 if (SCARG(uap, flags) & X_OK) 1853 flags |= VEXEC; 1854 1855 error = VOP_ACCESS(vp, flags, cred, p); 1856 if (!error && (flags & VWRITE)) 1857 error = vn_writechk(vp); 1858 } 1859 vput(vp); 1860 out1: 1861 cred->cr_uid = t_uid; 1862 cred->cr_gid = t_gid; 1863 return (error); 1864 } 1865 1866 /* 1867 * Get file status; this version follows links. 1868 */ 1869 /* ARGSUSED */ 1870 int 1871 sys___stat13(p, v, retval) 1872 struct proc *p; 1873 void *v; 1874 register_t *retval; 1875 { 1876 register struct sys___stat13_args /* { 1877 syscallarg(const char *) path; 1878 syscallarg(struct stat *) ub; 1879 } */ *uap = v; 1880 struct stat sb; 1881 int error; 1882 struct nameidata nd; 1883 1884 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1885 SCARG(uap, path), p); 1886 if ((error = namei(&nd)) != 0) 1887 return (error); 1888 error = vn_stat(nd.ni_vp, &sb, p); 1889 vput(nd.ni_vp); 1890 if (error) 1891 return (error); 1892 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1893 return (error); 1894 } 1895 1896 /* 1897 * Get file status; this version does not follow links. 1898 */ 1899 /* ARGSUSED */ 1900 int 1901 sys___lstat13(p, v, retval) 1902 struct proc *p; 1903 void *v; 1904 register_t *retval; 1905 { 1906 register struct sys___lstat13_args /* { 1907 syscallarg(const char *) path; 1908 syscallarg(struct stat *) ub; 1909 } */ *uap = v; 1910 struct stat sb; 1911 int error; 1912 struct nameidata nd; 1913 1914 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1915 SCARG(uap, path), p); 1916 if ((error = namei(&nd)) != 0) 1917 return (error); 1918 error = vn_stat(nd.ni_vp, &sb, p); 1919 vput(nd.ni_vp); 1920 if (error) 1921 return (error); 1922 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1923 return (error); 1924 } 1925 1926 /* 1927 * Get configurable pathname variables. 1928 */ 1929 /* ARGSUSED */ 1930 int 1931 sys_pathconf(p, v, retval) 1932 struct proc *p; 1933 void *v; 1934 register_t *retval; 1935 { 1936 register struct sys_pathconf_args /* { 1937 syscallarg(const char *) path; 1938 syscallarg(int) name; 1939 } */ *uap = v; 1940 int error; 1941 struct nameidata nd; 1942 1943 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1944 SCARG(uap, path), p); 1945 if ((error = namei(&nd)) != 0) 1946 return (error); 1947 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1948 vput(nd.ni_vp); 1949 return (error); 1950 } 1951 1952 /* 1953 * Return target name of a symbolic link. 1954 */ 1955 /* ARGSUSED */ 1956 int 1957 sys_readlink(p, v, retval) 1958 struct proc *p; 1959 void *v; 1960 register_t *retval; 1961 { 1962 register struct sys_readlink_args /* { 1963 syscallarg(const char *) path; 1964 syscallarg(char *) buf; 1965 syscallarg(size_t) count; 1966 } */ *uap = v; 1967 register struct vnode *vp; 1968 struct iovec aiov; 1969 struct uio auio; 1970 int error; 1971 struct nameidata nd; 1972 1973 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1974 SCARG(uap, path), p); 1975 if ((error = namei(&nd)) != 0) 1976 return (error); 1977 vp = nd.ni_vp; 1978 if (vp->v_type != VLNK) 1979 error = EINVAL; 1980 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1981 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1982 aiov.iov_base = SCARG(uap, buf); 1983 aiov.iov_len = SCARG(uap, count); 1984 auio.uio_iov = &aiov; 1985 auio.uio_iovcnt = 1; 1986 auio.uio_offset = 0; 1987 auio.uio_rw = UIO_READ; 1988 auio.uio_segflg = UIO_USERSPACE; 1989 auio.uio_procp = p; 1990 auio.uio_resid = SCARG(uap, count); 1991 error = VOP_READLINK(vp, &auio, p->p_ucred); 1992 } 1993 vput(vp); 1994 *retval = SCARG(uap, count) - auio.uio_resid; 1995 return (error); 1996 } 1997 1998 /* 1999 * Change flags of a file given a path name. 2000 */ 2001 /* ARGSUSED */ 2002 int 2003 sys_chflags(p, v, retval) 2004 struct proc *p; 2005 void *v; 2006 register_t *retval; 2007 { 2008 register struct sys_chflags_args /* { 2009 syscallarg(const char *) path; 2010 syscallarg(u_long) flags; 2011 } */ *uap = v; 2012 register struct vnode *vp; 2013 struct vattr vattr; 2014 int error; 2015 struct nameidata nd; 2016 2017 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2018 if ((error = namei(&nd)) != 0) 2019 return (error); 2020 vp = nd.ni_vp; 2021 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2022 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2023 VATTR_NULL(&vattr); 2024 vattr.va_flags = SCARG(uap, flags); 2025 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2026 vput(vp); 2027 return (error); 2028 } 2029 2030 /* 2031 * Change flags of a file given a file descriptor. 2032 */ 2033 /* ARGSUSED */ 2034 int 2035 sys_fchflags(p, v, retval) 2036 struct proc *p; 2037 void *v; 2038 register_t *retval; 2039 { 2040 register struct sys_fchflags_args /* { 2041 syscallarg(int) fd; 2042 syscallarg(u_long) flags; 2043 } */ *uap = v; 2044 struct vattr vattr; 2045 struct vnode *vp; 2046 struct file *fp; 2047 int error; 2048 2049 /* getvnode() will use the descriptor for us */ 2050 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2051 return (error); 2052 vp = (struct vnode *)fp->f_data; 2053 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2054 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2055 VATTR_NULL(&vattr); 2056 vattr.va_flags = SCARG(uap, flags); 2057 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2058 VOP_UNLOCK(vp, 0); 2059 FILE_UNUSE(fp, p); 2060 return (error); 2061 } 2062 2063 /* 2064 * Change mode of a file given path name; this version follows links. 2065 */ 2066 /* ARGSUSED */ 2067 int 2068 sys_chmod(p, v, retval) 2069 struct proc *p; 2070 void *v; 2071 register_t *retval; 2072 { 2073 register struct sys_chmod_args /* { 2074 syscallarg(const char *) path; 2075 syscallarg(int) mode; 2076 } */ *uap = v; 2077 int error; 2078 struct nameidata nd; 2079 2080 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2081 if ((error = namei(&nd)) != 0) 2082 return (error); 2083 2084 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2085 2086 vrele(nd.ni_vp); 2087 return (error); 2088 } 2089 2090 /* 2091 * Change mode of a file given a file descriptor. 2092 */ 2093 /* ARGSUSED */ 2094 int 2095 sys_fchmod(p, v, retval) 2096 struct proc *p; 2097 void *v; 2098 register_t *retval; 2099 { 2100 register struct sys_fchmod_args /* { 2101 syscallarg(int) fd; 2102 syscallarg(int) mode; 2103 } */ *uap = v; 2104 struct file *fp; 2105 int error; 2106 2107 /* getvnode() will use the descriptor for us */ 2108 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2109 return (error); 2110 2111 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2112 FILE_UNUSE(fp, p); 2113 return (error); 2114 } 2115 2116 /* 2117 * Change mode of a file given path name; this version does not follow links. 2118 */ 2119 /* ARGSUSED */ 2120 int 2121 sys_lchmod(p, v, retval) 2122 struct proc *p; 2123 void *v; 2124 register_t *retval; 2125 { 2126 register struct sys_lchmod_args /* { 2127 syscallarg(const char *) path; 2128 syscallarg(int) mode; 2129 } */ *uap = v; 2130 int error; 2131 struct nameidata nd; 2132 2133 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2134 if ((error = namei(&nd)) != 0) 2135 return (error); 2136 2137 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2138 2139 vrele(nd.ni_vp); 2140 return (error); 2141 } 2142 2143 /* 2144 * Common routine to set mode given a vnode. 2145 */ 2146 static int 2147 change_mode(vp, mode, p) 2148 struct vnode *vp; 2149 int mode; 2150 struct proc *p; 2151 { 2152 struct vattr vattr; 2153 int error; 2154 2155 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2156 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2157 VATTR_NULL(&vattr); 2158 vattr.va_mode = mode & ALLPERMS; 2159 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2160 VOP_UNLOCK(vp, 0); 2161 return (error); 2162 } 2163 2164 /* 2165 * Set ownership given a path name; this version follows links. 2166 */ 2167 /* ARGSUSED */ 2168 int 2169 sys_chown(p, v, retval) 2170 struct proc *p; 2171 void *v; 2172 register_t *retval; 2173 { 2174 register struct sys_chown_args /* { 2175 syscallarg(const char *) path; 2176 syscallarg(uid_t) uid; 2177 syscallarg(gid_t) gid; 2178 } */ *uap = v; 2179 int error; 2180 struct nameidata nd; 2181 2182 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2183 if ((error = namei(&nd)) != 0) 2184 return (error); 2185 2186 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2187 2188 vrele(nd.ni_vp); 2189 return (error); 2190 } 2191 2192 /* 2193 * Set ownership given a path name; this version follows links. 2194 * Provides POSIX semantics. 2195 */ 2196 /* ARGSUSED */ 2197 int 2198 sys___posix_chown(p, v, retval) 2199 struct proc *p; 2200 void *v; 2201 register_t *retval; 2202 { 2203 register struct sys_chown_args /* { 2204 syscallarg(const char *) path; 2205 syscallarg(uid_t) uid; 2206 syscallarg(gid_t) gid; 2207 } */ *uap = v; 2208 int error; 2209 struct nameidata nd; 2210 2211 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2212 if ((error = namei(&nd)) != 0) 2213 return (error); 2214 2215 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2216 2217 vrele(nd.ni_vp); 2218 return (error); 2219 } 2220 2221 /* 2222 * Set ownership given a file descriptor. 2223 */ 2224 /* ARGSUSED */ 2225 int 2226 sys_fchown(p, v, retval) 2227 struct proc *p; 2228 void *v; 2229 register_t *retval; 2230 { 2231 register struct sys_fchown_args /* { 2232 syscallarg(int) fd; 2233 syscallarg(uid_t) uid; 2234 syscallarg(gid_t) gid; 2235 } */ *uap = v; 2236 int error; 2237 struct file *fp; 2238 2239 /* getvnode() will use the descriptor for us */ 2240 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2241 return (error); 2242 2243 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2244 SCARG(uap, gid), p, 0); 2245 FILE_UNUSE(fp, p); 2246 return (error); 2247 } 2248 2249 /* 2250 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2251 */ 2252 /* ARGSUSED */ 2253 int 2254 sys___posix_fchown(p, v, retval) 2255 struct proc *p; 2256 void *v; 2257 register_t *retval; 2258 { 2259 register struct sys_fchown_args /* { 2260 syscallarg(int) fd; 2261 syscallarg(uid_t) uid; 2262 syscallarg(gid_t) gid; 2263 } */ *uap = v; 2264 int error; 2265 struct file *fp; 2266 2267 /* getvnode() will use the descriptor for us */ 2268 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2269 return (error); 2270 2271 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2272 SCARG(uap, gid), p, 1); 2273 FILE_UNUSE(fp, p); 2274 return (error); 2275 } 2276 2277 /* 2278 * Set ownership given a path name; this version does not follow links. 2279 */ 2280 /* ARGSUSED */ 2281 int 2282 sys_lchown(p, v, retval) 2283 struct proc *p; 2284 void *v; 2285 register_t *retval; 2286 { 2287 register struct sys_lchown_args /* { 2288 syscallarg(const char *) path; 2289 syscallarg(uid_t) uid; 2290 syscallarg(gid_t) gid; 2291 } */ *uap = v; 2292 int error; 2293 struct nameidata nd; 2294 2295 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2296 if ((error = namei(&nd)) != 0) 2297 return (error); 2298 2299 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2300 2301 vrele(nd.ni_vp); 2302 return (error); 2303 } 2304 2305 /* 2306 * Set ownership given a path name; this version does not follow links. 2307 * Provides POSIX/XPG semantics. 2308 */ 2309 /* ARGSUSED */ 2310 int 2311 sys___posix_lchown(p, v, retval) 2312 struct proc *p; 2313 void *v; 2314 register_t *retval; 2315 { 2316 register struct sys_lchown_args /* { 2317 syscallarg(const char *) path; 2318 syscallarg(uid_t) uid; 2319 syscallarg(gid_t) gid; 2320 } */ *uap = v; 2321 int error; 2322 struct nameidata nd; 2323 2324 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2325 if ((error = namei(&nd)) != 0) 2326 return (error); 2327 2328 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2329 2330 vrele(nd.ni_vp); 2331 return (error); 2332 } 2333 2334 /* 2335 * Common routine to set ownership given a vnode. 2336 */ 2337 static int 2338 change_owner(vp, uid, gid, p, posix_semantics) 2339 register struct vnode *vp; 2340 uid_t uid; 2341 gid_t gid; 2342 struct proc *p; 2343 int posix_semantics; 2344 { 2345 struct vattr vattr; 2346 mode_t newmode; 2347 int error; 2348 2349 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2350 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2351 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2352 goto out; 2353 2354 #define CHANGED(x) ((x) != -1) 2355 newmode = vattr.va_mode; 2356 if (posix_semantics) { 2357 /* 2358 * POSIX/XPG semantics: if the caller is not the super-user, 2359 * clear set-user-id and set-group-id bits. Both POSIX and 2360 * the XPG consider the behaviour for calls by the super-user 2361 * implementation-defined; we leave the set-user-id and set- 2362 * group-id settings intact in that case. 2363 */ 2364 if (suser(p->p_ucred, NULL) != 0) 2365 newmode &= ~(S_ISUID | S_ISGID); 2366 } else { 2367 /* 2368 * NetBSD semantics: when changing owner and/or group, 2369 * clear the respective bit(s). 2370 */ 2371 if (CHANGED(uid)) 2372 newmode &= ~S_ISUID; 2373 if (CHANGED(gid)) 2374 newmode &= ~S_ISGID; 2375 } 2376 /* Update va_mode iff altered. */ 2377 if (vattr.va_mode == newmode) 2378 newmode = VNOVAL; 2379 2380 VATTR_NULL(&vattr); 2381 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2382 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2383 vattr.va_mode = newmode; 2384 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2385 #undef CHANGED 2386 2387 out: 2388 VOP_UNLOCK(vp, 0); 2389 return (error); 2390 } 2391 2392 /* 2393 * Set the access and modification times given a path name; this 2394 * version follows links. 2395 */ 2396 /* ARGSUSED */ 2397 int 2398 sys_utimes(p, v, retval) 2399 struct proc *p; 2400 void *v; 2401 register_t *retval; 2402 { 2403 register struct sys_utimes_args /* { 2404 syscallarg(const char *) path; 2405 syscallarg(const struct timeval *) tptr; 2406 } */ *uap = v; 2407 int error; 2408 struct nameidata nd; 2409 2410 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2411 if ((error = namei(&nd)) != 0) 2412 return (error); 2413 2414 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2415 2416 vrele(nd.ni_vp); 2417 return (error); 2418 } 2419 2420 /* 2421 * Set the access and modification times given a file descriptor. 2422 */ 2423 /* ARGSUSED */ 2424 int 2425 sys_futimes(p, v, retval) 2426 struct proc *p; 2427 void *v; 2428 register_t *retval; 2429 { 2430 register struct sys_futimes_args /* { 2431 syscallarg(int) fd; 2432 syscallarg(const struct timeval *) tptr; 2433 } */ *uap = v; 2434 int error; 2435 struct file *fp; 2436 2437 /* getvnode() will use the descriptor for us */ 2438 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2439 return (error); 2440 2441 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2442 FILE_UNUSE(fp, p); 2443 return (error); 2444 } 2445 2446 /* 2447 * Set the access and modification times given a path name; this 2448 * version does not follow links. 2449 */ 2450 /* ARGSUSED */ 2451 int 2452 sys_lutimes(p, v, retval) 2453 struct proc *p; 2454 void *v; 2455 register_t *retval; 2456 { 2457 register struct sys_lutimes_args /* { 2458 syscallarg(const char *) path; 2459 syscallarg(const struct timeval *) tptr; 2460 } */ *uap = v; 2461 int error; 2462 struct nameidata nd; 2463 2464 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2465 if ((error = namei(&nd)) != 0) 2466 return (error); 2467 2468 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2469 2470 vrele(nd.ni_vp); 2471 return (error); 2472 } 2473 2474 /* 2475 * Common routine to set access and modification times given a vnode. 2476 */ 2477 static int 2478 change_utimes(vp, tptr, p) 2479 struct vnode *vp; 2480 const struct timeval *tptr; 2481 struct proc *p; 2482 { 2483 struct timeval tv[2]; 2484 struct vattr vattr; 2485 int error; 2486 2487 VATTR_NULL(&vattr); 2488 if (tptr == NULL) { 2489 microtime(&tv[0]); 2490 tv[1] = tv[0]; 2491 vattr.va_vaflags |= VA_UTIMES_NULL; 2492 } else { 2493 error = copyin(tptr, tv, sizeof(tv)); 2494 if (error) 2495 return (error); 2496 } 2497 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2498 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2499 vattr.va_atime.tv_sec = tv[0].tv_sec; 2500 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2501 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2502 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2503 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2504 VOP_UNLOCK(vp, 0); 2505 return (error); 2506 } 2507 2508 /* 2509 * Truncate a file given its path name. 2510 */ 2511 /* ARGSUSED */ 2512 int 2513 sys_truncate(p, v, retval) 2514 struct proc *p; 2515 void *v; 2516 register_t *retval; 2517 { 2518 register struct sys_truncate_args /* { 2519 syscallarg(const char *) path; 2520 syscallarg(int) pad; 2521 syscallarg(off_t) length; 2522 } */ *uap = v; 2523 register struct vnode *vp; 2524 struct vattr vattr; 2525 int error; 2526 struct nameidata nd; 2527 2528 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2529 if ((error = namei(&nd)) != 0) 2530 return (error); 2531 vp = nd.ni_vp; 2532 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2533 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2534 if (vp->v_type == VDIR) 2535 error = EISDIR; 2536 else if ((error = vn_writechk(vp)) == 0 && 2537 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2538 VATTR_NULL(&vattr); 2539 vattr.va_size = SCARG(uap, length); 2540 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2541 } 2542 vput(vp); 2543 return (error); 2544 } 2545 2546 /* 2547 * Truncate a file given a file descriptor. 2548 */ 2549 /* ARGSUSED */ 2550 int 2551 sys_ftruncate(p, v, retval) 2552 struct proc *p; 2553 void *v; 2554 register_t *retval; 2555 { 2556 register struct sys_ftruncate_args /* { 2557 syscallarg(int) fd; 2558 syscallarg(int) pad; 2559 syscallarg(off_t) length; 2560 } */ *uap = v; 2561 struct vattr vattr; 2562 struct vnode *vp; 2563 struct file *fp; 2564 int error; 2565 2566 /* getvnode() will use the descriptor for us */ 2567 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2568 return (error); 2569 if ((fp->f_flag & FWRITE) == 0) { 2570 error = EINVAL; 2571 goto out; 2572 } 2573 vp = (struct vnode *)fp->f_data; 2574 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2575 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2576 if (vp->v_type == VDIR) 2577 error = EISDIR; 2578 else if ((error = vn_writechk(vp)) == 0) { 2579 VATTR_NULL(&vattr); 2580 vattr.va_size = SCARG(uap, length); 2581 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2582 } 2583 VOP_UNLOCK(vp, 0); 2584 out: 2585 FILE_UNUSE(fp, p); 2586 return (error); 2587 } 2588 2589 /* 2590 * Sync an open file. 2591 */ 2592 /* ARGSUSED */ 2593 int 2594 sys_fsync(p, v, retval) 2595 struct proc *p; 2596 void *v; 2597 register_t *retval; 2598 { 2599 struct sys_fsync_args /* { 2600 syscallarg(int) fd; 2601 } */ *uap = v; 2602 register struct vnode *vp; 2603 struct file *fp; 2604 int error; 2605 2606 /* getvnode() will use the descriptor for us */ 2607 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2608 return (error); 2609 vp = (struct vnode *)fp->f_data; 2610 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2611 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2612 VOP_UNLOCK(vp, 0); 2613 FILE_UNUSE(fp, p); 2614 return (error); 2615 } 2616 2617 /* 2618 * Sync the data of an open file. 2619 */ 2620 /* ARGSUSED */ 2621 int 2622 sys_fdatasync(p, v, retval) 2623 struct proc *p; 2624 void *v; 2625 register_t *retval; 2626 { 2627 struct sys_fdatasync_args /* { 2628 syscallarg(int) fd; 2629 } */ *uap = v; 2630 struct vnode *vp; 2631 struct file *fp; 2632 int error; 2633 2634 /* getvnode() will use the descriptor for us */ 2635 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2636 return (error); 2637 vp = (struct vnode *)fp->f_data; 2638 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2639 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2640 VOP_UNLOCK(vp, 0); 2641 FILE_UNUSE(fp, p); 2642 return (error); 2643 } 2644 2645 /* 2646 * Rename files, (standard) BSD semantics frontend. 2647 */ 2648 /* ARGSUSED */ 2649 int 2650 sys_rename(p, v, retval) 2651 struct proc *p; 2652 void *v; 2653 register_t *retval; 2654 { 2655 register struct sys_rename_args /* { 2656 syscallarg(const char *) from; 2657 syscallarg(const char *) to; 2658 } */ *uap = v; 2659 2660 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2661 } 2662 2663 /* 2664 * Rename files, POSIX semantics frontend. 2665 */ 2666 /* ARGSUSED */ 2667 int 2668 sys___posix_rename(p, v, retval) 2669 struct proc *p; 2670 void *v; 2671 register_t *retval; 2672 { 2673 register struct sys___posix_rename_args /* { 2674 syscallarg(const char *) from; 2675 syscallarg(const char *) to; 2676 } */ *uap = v; 2677 2678 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2679 } 2680 2681 /* 2682 * Rename files. Source and destination must either both be directories, 2683 * or both not be directories. If target is a directory, it must be empty. 2684 * If `from' and `to' refer to the same object, the value of the `retain' 2685 * argument is used to determine whether `from' will be 2686 * 2687 * (retain == 0) deleted unless `from' and `to' refer to the same 2688 * object in the file system's name space (BSD). 2689 * (retain == 1) always retained (POSIX). 2690 */ 2691 static int 2692 rename_files(from, to, p, retain) 2693 const char *from, *to; 2694 struct proc *p; 2695 int retain; 2696 { 2697 register struct vnode *tvp, *fvp, *tdvp; 2698 struct nameidata fromnd, tond; 2699 int error; 2700 2701 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2702 from, p); 2703 if ((error = namei(&fromnd)) != 0) 2704 return (error); 2705 fvp = fromnd.ni_vp; 2706 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2707 UIO_USERSPACE, to, p); 2708 if ((error = namei(&tond)) != 0) { 2709 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2710 vrele(fromnd.ni_dvp); 2711 vrele(fvp); 2712 goto out1; 2713 } 2714 tdvp = tond.ni_dvp; 2715 tvp = tond.ni_vp; 2716 2717 if (tvp != NULL) { 2718 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2719 error = ENOTDIR; 2720 goto out; 2721 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2722 error = EISDIR; 2723 goto out; 2724 } 2725 } 2726 2727 if (fvp == tdvp) 2728 error = EINVAL; 2729 2730 /* 2731 * Source and destination refer to the same object. 2732 */ 2733 if (fvp == tvp) { 2734 if (retain) 2735 error = -1; 2736 else if (fromnd.ni_dvp == tdvp && 2737 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2738 !memcmp(fromnd.ni_cnd.cn_nameptr, 2739 tond.ni_cnd.cn_nameptr, 2740 fromnd.ni_cnd.cn_namelen)) 2741 error = -1; 2742 } 2743 2744 out: 2745 if (!error) { 2746 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2747 if (fromnd.ni_dvp != tdvp) 2748 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2749 if (tvp) { 2750 (void)uvm_vnp_uncache(tvp); 2751 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2752 } 2753 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2754 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2755 } else { 2756 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2757 if (tdvp == tvp) 2758 vrele(tdvp); 2759 else 2760 vput(tdvp); 2761 if (tvp) 2762 vput(tvp); 2763 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2764 vrele(fromnd.ni_dvp); 2765 vrele(fvp); 2766 } 2767 vrele(tond.ni_startdir); 2768 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2769 out1: 2770 if (fromnd.ni_startdir) 2771 vrele(fromnd.ni_startdir); 2772 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2773 return (error == -1 ? 0 : error); 2774 } 2775 2776 /* 2777 * Make a directory file. 2778 */ 2779 /* ARGSUSED */ 2780 int 2781 sys_mkdir(p, v, retval) 2782 struct proc *p; 2783 void *v; 2784 register_t *retval; 2785 { 2786 register struct sys_mkdir_args /* { 2787 syscallarg(const char *) path; 2788 syscallarg(int) mode; 2789 } */ *uap = v; 2790 register struct vnode *vp; 2791 struct vattr vattr; 2792 int error; 2793 struct nameidata nd; 2794 2795 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2796 if ((error = namei(&nd)) != 0) 2797 return (error); 2798 vp = nd.ni_vp; 2799 if (vp != NULL) { 2800 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2801 if (nd.ni_dvp == vp) 2802 vrele(nd.ni_dvp); 2803 else 2804 vput(nd.ni_dvp); 2805 vrele(vp); 2806 return (EEXIST); 2807 } 2808 VATTR_NULL(&vattr); 2809 vattr.va_type = VDIR; 2810 vattr.va_mode = 2811 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2812 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2813 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2814 if (!error) 2815 vput(nd.ni_vp); 2816 return (error); 2817 } 2818 2819 /* 2820 * Remove a directory file. 2821 */ 2822 /* ARGSUSED */ 2823 int 2824 sys_rmdir(p, v, retval) 2825 struct proc *p; 2826 void *v; 2827 register_t *retval; 2828 { 2829 struct sys_rmdir_args /* { 2830 syscallarg(const char *) path; 2831 } */ *uap = v; 2832 register struct vnode *vp; 2833 int error; 2834 struct nameidata nd; 2835 2836 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2837 SCARG(uap, path), p); 2838 if ((error = namei(&nd)) != 0) 2839 return (error); 2840 vp = nd.ni_vp; 2841 if (vp->v_type != VDIR) { 2842 error = ENOTDIR; 2843 goto out; 2844 } 2845 /* 2846 * No rmdir "." please. 2847 */ 2848 if (nd.ni_dvp == vp) { 2849 error = EINVAL; 2850 goto out; 2851 } 2852 /* 2853 * The root of a mounted filesystem cannot be deleted. 2854 */ 2855 if (vp->v_flag & VROOT) 2856 error = EBUSY; 2857 out: 2858 if (!error) { 2859 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2860 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2861 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2862 } else { 2863 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2864 if (nd.ni_dvp == vp) 2865 vrele(nd.ni_dvp); 2866 else 2867 vput(nd.ni_dvp); 2868 vput(vp); 2869 } 2870 return (error); 2871 } 2872 2873 /* 2874 * Read a block of directory entries in a file system independent format. 2875 */ 2876 int 2877 sys_getdents(p, v, retval) 2878 struct proc *p; 2879 void *v; 2880 register_t *retval; 2881 { 2882 register struct sys_getdents_args /* { 2883 syscallarg(int) fd; 2884 syscallarg(char *) buf; 2885 syscallarg(size_t) count; 2886 } */ *uap = v; 2887 struct file *fp; 2888 int error, done; 2889 2890 /* getvnode() will use the descriptor for us */ 2891 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2892 return (error); 2893 if ((fp->f_flag & FREAD) == 0) { 2894 error = EBADF; 2895 goto out; 2896 } 2897 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2898 SCARG(uap, count), &done, p, 0, 0); 2899 *retval = done; 2900 out: 2901 FILE_UNUSE(fp, p); 2902 return (error); 2903 } 2904 2905 /* 2906 * Set the mode mask for creation of filesystem nodes. 2907 */ 2908 int 2909 sys_umask(p, v, retval) 2910 struct proc *p; 2911 void *v; 2912 register_t *retval; 2913 { 2914 struct sys_umask_args /* { 2915 syscallarg(mode_t) newmask; 2916 } */ *uap = v; 2917 struct cwdinfo *cwdi; 2918 2919 cwdi = p->p_cwdi; 2920 *retval = cwdi->cwdi_cmask; 2921 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2922 return (0); 2923 } 2924 2925 /* 2926 * Void all references to file by ripping underlying filesystem 2927 * away from vnode. 2928 */ 2929 /* ARGSUSED */ 2930 int 2931 sys_revoke(p, v, retval) 2932 struct proc *p; 2933 void *v; 2934 register_t *retval; 2935 { 2936 register struct sys_revoke_args /* { 2937 syscallarg(const char *) path; 2938 } */ *uap = v; 2939 register struct vnode *vp; 2940 struct vattr vattr; 2941 int error; 2942 struct nameidata nd; 2943 2944 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2945 if ((error = namei(&nd)) != 0) 2946 return (error); 2947 vp = nd.ni_vp; 2948 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2949 goto out; 2950 if (p->p_ucred->cr_uid != vattr.va_uid && 2951 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2952 goto out; 2953 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2954 VOP_REVOKE(vp, REVOKEALL); 2955 out: 2956 vrele(vp); 2957 return (error); 2958 } 2959 2960 /* 2961 * Convert a user file descriptor to a kernel file entry. 2962 */ 2963 int 2964 getvnode(fdp, fd, fpp) 2965 struct filedesc *fdp; 2966 int fd; 2967 struct file **fpp; 2968 { 2969 struct vnode *vp; 2970 struct file *fp; 2971 2972 if ((u_int)fd >= fdp->fd_nfiles || 2973 (fp = fdp->fd_ofiles[fd]) == NULL || 2974 (fp->f_iflags & FIF_WANTCLOSE) != 0) 2975 return (EBADF); 2976 2977 FILE_USE(fp); 2978 2979 if (fp->f_type != DTYPE_VNODE) { 2980 FILE_UNUSE(fp, NULL); 2981 return (EINVAL); 2982 } 2983 2984 vp = (struct vnode *)fp->f_data; 2985 if (vp->v_type == VBAD) { 2986 FILE_UNUSE(fp, NULL); 2987 return (EBADF); 2988 } 2989 2990 *fpp = fp; 2991 return (0); 2992 } 2993
Indexes created Wed Sep 24 05:09:52 GMT 2025