vfs_syscalls.c revision 1.133.4.3
1 /* $NetBSD: vfs_syscalls.c,v 1.133.4.3 1999/07/02 18:54:10 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 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; 460 461 simple_lock(&mountlist_slock); 462 mp->mnt_flag |= MNT_UNMOUNT; 463 vfs_unbusy(mp); 464 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 465 if (mp->mnt_flag & MNT_EXPUBLIC) 466 vfs_setpublicfs(NULL, NULL, NULL); 467 mp->mnt_flag &=~ MNT_ASYNC; 468 cache_purgevfs(mp); /* remove cache entries for this file sys */ 469 if (((mp->mnt_flag & MNT_RDONLY) || 470 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 471 (flags & MNT_FORCE)) 472 error = VFS_UNMOUNT(mp, flags, p); 473 simple_lock(&mountlist_slock); 474 if (error) { 475 mp->mnt_flag &= ~MNT_UNMOUNT; 476 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 477 &mountlist_slock); 478 if (mp->mnt_flag & MNT_MWAIT) 479 wakeup((caddr_t)mp); 480 return (error); 481 } 482 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 483 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 484 coveredvp->v_mountedhere = NULL; 485 vrele(coveredvp); 486 } 487 mp->mnt_op->vfs_refcount--; 488 if (mp->mnt_vnodelist.lh_first != NULL) 489 panic("unmount: dangling vnode"); 490 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 491 if (mp->mnt_flag & MNT_MWAIT) 492 wakeup((caddr_t)mp); 493 free((caddr_t)mp, M_MOUNT); 494 return (0); 495 } 496 497 /* 498 * Sync each mounted filesystem. 499 */ 500 #ifdef DEBUG 501 int syncprt = 0; 502 struct ctldebug debug0 = { "syncprt", &syncprt }; 503 #endif 504 505 /* ARGSUSED */ 506 int 507 sys_sync(p, v, retval) 508 struct proc *p; 509 void *v; 510 register_t *retval; 511 { 512 register struct mount *mp, *nmp; 513 int asyncflag; 514 515 simple_lock(&mountlist_slock); 516 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 517 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 518 nmp = mp->mnt_list.cqe_prev; 519 continue; 520 } 521 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 522 asyncflag = mp->mnt_flag & MNT_ASYNC; 523 mp->mnt_flag &= ~MNT_ASYNC; 524 uvm_vnp_sync(mp); 525 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 526 if (asyncflag) 527 mp->mnt_flag |= MNT_ASYNC; 528 } 529 simple_lock(&mountlist_slock); 530 nmp = mp->mnt_list.cqe_prev; 531 vfs_unbusy(mp); 532 533 } 534 simple_unlock(&mountlist_slock); 535 #ifdef DEBUG 536 if (syncprt) 537 vfs_bufstats(); 538 #endif /* DEBUG */ 539 return (0); 540 } 541 542 /* 543 * Change filesystem quotas. 544 */ 545 /* ARGSUSED */ 546 int 547 sys_quotactl(p, v, retval) 548 struct proc *p; 549 void *v; 550 register_t *retval; 551 { 552 register struct sys_quotactl_args /* { 553 syscallarg(const char *) path; 554 syscallarg(int) cmd; 555 syscallarg(int) uid; 556 syscallarg(caddr_t) arg; 557 } */ *uap = v; 558 register struct mount *mp; 559 int error; 560 struct nameidata nd; 561 562 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 563 if ((error = namei(&nd)) != 0) 564 return (error); 565 mp = nd.ni_vp->v_mount; 566 vrele(nd.ni_vp); 567 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 568 SCARG(uap, arg), p)); 569 } 570 571 /* 572 * Get filesystem statistics. 573 */ 574 /* ARGSUSED */ 575 int 576 sys_statfs(p, v, retval) 577 struct proc *p; 578 void *v; 579 register_t *retval; 580 { 581 register struct sys_statfs_args /* { 582 syscallarg(const char *) path; 583 syscallarg(struct statfs *) buf; 584 } */ *uap = v; 585 register struct mount *mp; 586 register struct statfs *sp; 587 int error; 588 struct nameidata nd; 589 590 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 591 if ((error = namei(&nd)) != 0) 592 return (error); 593 mp = nd.ni_vp->v_mount; 594 sp = &mp->mnt_stat; 595 vrele(nd.ni_vp); 596 if ((error = VFS_STATFS(mp, sp, p)) != 0) 597 return (error); 598 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 599 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 600 } 601 602 /* 603 * Get filesystem statistics. 604 */ 605 /* ARGSUSED */ 606 int 607 sys_fstatfs(p, v, retval) 608 struct proc *p; 609 void *v; 610 register_t *retval; 611 { 612 register struct sys_fstatfs_args /* { 613 syscallarg(int) fd; 614 syscallarg(struct statfs *) buf; 615 } */ *uap = v; 616 struct file *fp; 617 struct mount *mp; 618 register struct statfs *sp; 619 int error; 620 621 /* getvnode() will use the descriptor for us */ 622 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 623 return (error); 624 mp = ((struct vnode *)fp->f_data)->v_mount; 625 sp = &mp->mnt_stat; 626 if ((error = VFS_STATFS(mp, sp, p)) != 0) 627 goto out; 628 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 629 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 630 out: 631 FILE_UNUSE(fp, p); 632 return (error); 633 } 634 635 /* 636 * Get statistics on all filesystems. 637 */ 638 int 639 sys_getfsstat(p, v, retval) 640 struct proc *p; 641 void *v; 642 register_t *retval; 643 { 644 register struct sys_getfsstat_args /* { 645 syscallarg(struct statfs *) buf; 646 syscallarg(long) bufsize; 647 syscallarg(int) flags; 648 } */ *uap = v; 649 register struct mount *mp, *nmp; 650 register struct statfs *sp; 651 caddr_t sfsp; 652 long count, maxcount, error; 653 654 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 655 sfsp = (caddr_t)SCARG(uap, buf); 656 simple_lock(&mountlist_slock); 657 count = 0; 658 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 659 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 660 nmp = mp->mnt_list.cqe_next; 661 continue; 662 } 663 if (sfsp && count < maxcount) { 664 sp = &mp->mnt_stat; 665 /* 666 * If MNT_NOWAIT is specified, do not refresh the 667 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 668 */ 669 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 670 (SCARG(uap, flags) & MNT_WAIT)) && 671 (error = VFS_STATFS(mp, sp, p)) != 0) { 672 simple_lock(&mountlist_slock); 673 nmp = mp->mnt_list.cqe_next; 674 vfs_unbusy(mp); 675 continue; 676 } 677 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 678 error = copyout(sp, sfsp, sizeof(*sp)); 679 if (error) { 680 vfs_unbusy(mp); 681 return (error); 682 } 683 sfsp += sizeof(*sp); 684 } 685 count++; 686 simple_lock(&mountlist_slock); 687 nmp = mp->mnt_list.cqe_next; 688 vfs_unbusy(mp); 689 } 690 simple_unlock(&mountlist_slock); 691 if (sfsp && count > maxcount) 692 *retval = maxcount; 693 else 694 *retval = count; 695 return (0); 696 } 697 698 /* 699 * Change current working directory to a given file descriptor. 700 */ 701 /* ARGSUSED */ 702 int 703 sys_fchdir(p, v, retval) 704 struct proc *p; 705 void *v; 706 register_t *retval; 707 { 708 struct sys_fchdir_args /* { 709 syscallarg(int) fd; 710 } */ *uap = v; 711 struct filedesc *fdp = p->p_fd; 712 struct cwdinfo *cwdi = p->p_cwdi; 713 struct vnode *vp, *tdp; 714 struct mount *mp; 715 struct file *fp; 716 int error; 717 718 /* getvnode() will use the descriptor for us */ 719 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 720 return (error); 721 vp = (struct vnode *)fp->f_data; 722 723 VREF(vp); 724 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 725 if (vp->v_type != VDIR) 726 error = ENOTDIR; 727 else 728 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 729 while (!error && (mp = vp->v_mountedhere) != NULL) { 730 if (vfs_busy(mp, 0, 0)) 731 continue; 732 error = VFS_ROOT(mp, &tdp); 733 vfs_unbusy(mp); 734 if (error) 735 break; 736 vput(vp); 737 vp = tdp; 738 } 739 if (error) { 740 vput(vp); 741 goto out; 742 } 743 VOP_UNLOCK(vp, 0); 744 745 /* 746 * Disallow changing to a directory not under the process's 747 * current root directory (if there is one). 748 */ 749 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 750 vrele(vp); 751 error = EPERM; /* operation not permitted */ 752 goto out; 753 } 754 755 vrele(cwdi->cwdi_cdir); 756 cwdi->cwdi_cdir = vp; 757 out: 758 FILE_UNUSE(fp, p); 759 return (error); 760 } 761 762 /* 763 * Change this process's notion of the root directory to a given file descriptor. 764 */ 765 766 int 767 sys_fchroot(p, v, retval) 768 struct proc *p; 769 void *v; 770 register_t *retval; 771 { 772 struct sys_fchroot_args *uap = v; 773 struct filedesc *fdp = p->p_fd; 774 struct cwdinfo *cwdi = p->p_cwdi; 775 struct vnode *vp; 776 struct file *fp; 777 int error; 778 779 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 780 return error; 781 /* getvnode() will use the descriptor for us */ 782 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 783 return error; 784 vp = (struct vnode *) fp->f_data; 785 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 786 if (vp->v_type != VDIR) 787 error = ENOTDIR; 788 else 789 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 790 VOP_UNLOCK(vp, 0); 791 if (error) 792 goto out; 793 VREF(vp); 794 795 /* 796 * Prevent escaping from chroot by putting the root under 797 * the working directory. Silently chdir to / if we aren't 798 * already there. 799 */ 800 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 801 /* 802 * XXX would be more failsafe to change directory to a 803 * deadfs node here instead 804 */ 805 vrele(cwdi->cwdi_cdir); 806 VREF(vp); 807 cwdi->cwdi_cdir = vp; 808 } 809 810 if (cwdi->cwdi_rdir != NULL) 811 vrele(cwdi->cwdi_rdir); 812 cwdi->cwdi_rdir = vp; 813 out: 814 FILE_UNUSE(fp, p); 815 return (error); 816 } 817 818 819 820 /* 821 * Change current working directory (``.''). 822 */ 823 /* ARGSUSED */ 824 int 825 sys_chdir(p, v, retval) 826 struct proc *p; 827 void *v; 828 register_t *retval; 829 { 830 struct sys_chdir_args /* { 831 syscallarg(const char *) path; 832 } */ *uap = v; 833 struct cwdinfo *cwdi = p->p_cwdi; 834 int error; 835 struct nameidata nd; 836 837 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 838 SCARG(uap, path), p); 839 if ((error = change_dir(&nd, p)) != 0) 840 return (error); 841 vrele(cwdi->cwdi_cdir); 842 cwdi->cwdi_cdir = nd.ni_vp; 843 return (0); 844 } 845 846 /* 847 * Change notion of root (``/'') directory. 848 */ 849 /* ARGSUSED */ 850 int 851 sys_chroot(p, v, retval) 852 struct proc *p; 853 void *v; 854 register_t *retval; 855 { 856 struct sys_chroot_args /* { 857 syscallarg(const char *) path; 858 } */ *uap = v; 859 struct cwdinfo *cwdi = p->p_cwdi; 860 struct vnode *vp; 861 int error; 862 struct nameidata nd; 863 864 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 865 return (error); 866 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 867 SCARG(uap, path), p); 868 if ((error = change_dir(&nd, p)) != 0) 869 return (error); 870 if (cwdi->cwdi_rdir != NULL) 871 vrele(cwdi->cwdi_rdir); 872 vp = nd.ni_vp; 873 cwdi->cwdi_rdir = vp; 874 875 /* 876 * Prevent escaping from chroot by putting the root under 877 * the working directory. Silently chdir to / if we aren't 878 * already there. 879 */ 880 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 881 /* 882 * XXX would be more failsafe to change directory to a 883 * deadfs node here instead 884 */ 885 vrele(cwdi->cwdi_cdir); 886 VREF(vp); 887 cwdi->cwdi_cdir = vp; 888 } 889 890 return (0); 891 } 892 893 /* 894 * Common routine for chroot and chdir. 895 */ 896 static int 897 change_dir(ndp, p) 898 register struct nameidata *ndp; 899 struct proc *p; 900 { 901 struct vnode *vp; 902 int error; 903 904 if ((error = namei(ndp)) != 0) 905 return (error); 906 vp = ndp->ni_vp; 907 if (vp->v_type != VDIR) 908 error = ENOTDIR; 909 else 910 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 911 912 if (error) 913 vput(vp); 914 else 915 VOP_UNLOCK(vp, 0); 916 return (error); 917 } 918 919 /* 920 * Check permissions, allocate an open file structure, 921 * and call the device open routine if any. 922 */ 923 int 924 sys_open(p, v, retval) 925 struct proc *p; 926 void *v; 927 register_t *retval; 928 { 929 register struct sys_open_args /* { 930 syscallarg(const char *) path; 931 syscallarg(int) flags; 932 syscallarg(int) mode; 933 } */ *uap = v; 934 struct cwdinfo *cwdi = p->p_cwdi; 935 struct filedesc *fdp = p->p_fd; 936 struct file *fp; 937 struct vnode *vp; 938 int flags, cmode; 939 int type, indx, error; 940 struct flock lf; 941 struct nameidata nd; 942 extern struct fileops vnops; 943 944 flags = FFLAGS(SCARG(uap, flags)); 945 if ((flags & (FREAD | FWRITE)) == 0) 946 return (EINVAL); 947 /* falloc() will use the file descriptor for us */ 948 if ((error = falloc(p, &fp, &indx)) != 0) 949 return (error); 950 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 951 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 952 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 953 if ((error = vn_open(&nd, flags, cmode)) != 0) { 954 FILE_UNUSE(fp, p); 955 ffree(fp); 956 if ((error == ENODEV || error == ENXIO) && 957 p->p_dupfd >= 0 && /* XXX from fdopen */ 958 (error = 959 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 960 *retval = indx; 961 return (0); 962 } 963 if (error == ERESTART) 964 error = EINTR; 965 fdp->fd_ofiles[indx] = NULL; 966 return (error); 967 } 968 p->p_dupfd = 0; 969 vp = nd.ni_vp; 970 fp->f_flag = flags & FMASK; 971 fp->f_type = DTYPE_VNODE; 972 fp->f_ops = &vnops; 973 fp->f_data = (caddr_t)vp; 974 if (flags & (O_EXLOCK | O_SHLOCK)) { 975 lf.l_whence = SEEK_SET; 976 lf.l_start = 0; 977 lf.l_len = 0; 978 if (flags & O_EXLOCK) 979 lf.l_type = F_WRLCK; 980 else 981 lf.l_type = F_RDLCK; 982 type = F_FLOCK; 983 if ((flags & FNONBLOCK) == 0) 984 type |= F_WAIT; 985 VOP_UNLOCK(vp, 0); 986 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 987 if (error) { 988 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 989 FILE_UNUSE(fp, p); 990 ffree(fp); 991 fdp->fd_ofiles[indx] = NULL; 992 return (error); 993 } 994 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 995 fp->f_flag |= FHASLOCK; 996 } 997 VOP_UNLOCK(vp, 0); 998 *retval = indx; 999 FILE_UNUSE(fp, p); 1000 return (0); 1001 } 1002 1003 /* 1004 * Get file handle system call 1005 */ 1006 int 1007 sys_getfh(p, v, retval) 1008 struct proc *p; 1009 register void *v; 1010 register_t *retval; 1011 { 1012 register struct sys_getfh_args /* { 1013 syscallarg(char *) fname; 1014 syscallarg(fhandle_t *) fhp; 1015 } */ *uap = v; 1016 register struct vnode *vp; 1017 fhandle_t fh; 1018 int error; 1019 struct nameidata nd; 1020 1021 /* 1022 * Must be super user 1023 */ 1024 error = suser(p->p_ucred, &p->p_acflag); 1025 if (error) 1026 return (error); 1027 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1028 SCARG(uap, fname), p); 1029 error = namei(&nd); 1030 if (error) 1031 return (error); 1032 vp = nd.ni_vp; 1033 memset((caddr_t)&fh, 0, sizeof(fh)); 1034 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1035 error = VFS_VPTOFH(vp, &fh.fh_fid); 1036 vput(vp); 1037 if (error) 1038 return (error); 1039 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1040 return (error); 1041 } 1042 1043 /* 1044 * Open a file given a file handle. 1045 * 1046 * Check permissions, allocate an open file structure, 1047 * and call the device open routine if any. 1048 */ 1049 int 1050 sys_fhopen(p, v, retval) 1051 struct proc *p; 1052 void *v; 1053 register_t *retval; 1054 { 1055 register struct sys_fhopen_args /* { 1056 syscallarg(const fhandle_t *) fhp; 1057 syscallarg(int) flags; 1058 } */ *uap = v; 1059 struct filedesc *fdp = p->p_fd; 1060 struct file *fp; 1061 struct vnode *vp = NULL; 1062 struct mount *mp; 1063 struct ucred *cred = p->p_ucred; 1064 int flags; 1065 struct file *nfp; 1066 int type, indx, error=0; 1067 struct flock lf; 1068 struct vattr va; 1069 fhandle_t fh; 1070 extern struct fileops vnops; 1071 1072 /* 1073 * Must be super user 1074 */ 1075 if ((error = suser(p->p_ucred, &p->p_acflag))) 1076 return (error); 1077 1078 flags = FFLAGS(SCARG(uap, flags)); 1079 if ((flags & (FREAD | FWRITE)) == 0) 1080 return (EINVAL); 1081 if ((flags & O_CREAT)) 1082 return (EINVAL); 1083 /* falloc() will use the file descriptor for us */ 1084 if ((error = falloc(p, &nfp, &indx)) != 0) 1085 return (error); 1086 fp = nfp; 1087 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1088 goto bad; 1089 1090 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1091 error = ESTALE; 1092 goto bad; 1093 } 1094 1095 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1096 vp = NULL; /* most likely unnecessary sanity for bad: */ 1097 goto bad; 1098 } 1099 1100 /* Now do an effective vn_open */ 1101 1102 if (vp->v_type == VSOCK) { 1103 error = EOPNOTSUPP; 1104 goto bad; 1105 } 1106 if (flags & FREAD) { 1107 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1108 goto bad; 1109 } 1110 if (flags & (FWRITE | O_TRUNC)) { 1111 if (vp->v_type == VDIR) { 1112 error = EISDIR; 1113 goto bad; 1114 } 1115 if ((error = vn_writechk(vp)) != 0 || 1116 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1117 goto bad; 1118 } 1119 if (flags & O_TRUNC) { 1120 VOP_UNLOCK(vp, 0); /* XXX */ 1121 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1122 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1123 VATTR_NULL(&va); 1124 va.va_size = 0; 1125 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1126 goto bad; 1127 } 1128 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1129 goto bad; 1130 if (vp->v_type == VREG && 1131 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1132 error = EIO; 1133 goto bad; 1134 } 1135 if (flags & FWRITE) 1136 vp->v_writecount++; 1137 1138 /* done with modified vn_open, now finish what sys_open does. */ 1139 1140 fp->f_flag = flags & FMASK; 1141 fp->f_type = DTYPE_VNODE; 1142 fp->f_ops = &vnops; 1143 fp->f_data = (caddr_t)vp; 1144 if (flags & (O_EXLOCK | O_SHLOCK)) { 1145 lf.l_whence = SEEK_SET; 1146 lf.l_start = 0; 1147 lf.l_len = 0; 1148 if (flags & O_EXLOCK) 1149 lf.l_type = F_WRLCK; 1150 else 1151 lf.l_type = F_RDLCK; 1152 type = F_FLOCK; 1153 if ((flags & FNONBLOCK) == 0) 1154 type |= F_WAIT; 1155 VOP_UNLOCK(vp, 0); 1156 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1157 if (error) { 1158 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1159 FILE_UNUSE(fp, p); 1160 ffree(fp); 1161 fdp->fd_ofiles[indx] = NULL; 1162 return (error); 1163 } 1164 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1165 fp->f_flag |= FHASLOCK; 1166 } 1167 VOP_UNLOCK(vp, 0); 1168 *retval = indx; 1169 FILE_UNUSE(fp, p); 1170 return (0); 1171 1172 bad: 1173 FILE_UNUSE(fp, p); 1174 ffree(fp); 1175 fdp->fd_ofiles[indx] = NULL; 1176 if (vp != NULL) 1177 vput(vp); 1178 return (error); 1179 } 1180 1181 /* ARGSUSED */ 1182 int 1183 sys_fhstat(p, v, retval) 1184 struct proc *p; 1185 void *v; 1186 register_t *retval; 1187 { 1188 register struct sys_fhstat_args /* { 1189 syscallarg(const fhandle_t *) fhp; 1190 syscallarg(struct stat *) sb; 1191 } */ *uap = v; 1192 struct stat sb; 1193 int error; 1194 fhandle_t fh; 1195 struct mount *mp; 1196 struct vnode *vp; 1197 1198 /* 1199 * Must be super user 1200 */ 1201 if ((error = suser(p->p_ucred, &p->p_acflag))) 1202 return (error); 1203 1204 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1205 return (error); 1206 1207 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1208 return (ESTALE); 1209 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1210 return (error); 1211 error = vn_stat(vp, &sb, p); 1212 vput(vp); 1213 if (error) 1214 return (error); 1215 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1216 return (error); 1217 } 1218 1219 /* ARGSUSED */ 1220 int 1221 sys_fhstatfs(p, v, retval) 1222 struct proc *p; 1223 void *v; 1224 register_t *retval; 1225 { 1226 register struct sys_fhstatfs_args /* 1227 syscallarg(const fhandle_t *) fhp; 1228 syscallarg(struct statfs *) buf; 1229 } */ *uap = v; 1230 struct statfs sp; 1231 fhandle_t fh; 1232 struct mount *mp; 1233 struct vnode *vp; 1234 int error; 1235 1236 /* 1237 * Must be super user 1238 */ 1239 if ((error = suser(p->p_ucred, &p->p_acflag))) 1240 return (error); 1241 1242 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1243 return (error); 1244 1245 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1246 return (ESTALE); 1247 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1248 return (error); 1249 mp = vp->v_mount; 1250 vput(vp); 1251 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1252 return (error); 1253 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1254 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1255 } 1256 1257 /* 1258 * Create a special file. 1259 */ 1260 /* ARGSUSED */ 1261 int 1262 sys_mknod(p, v, retval) 1263 struct proc *p; 1264 void *v; 1265 register_t *retval; 1266 { 1267 register struct sys_mknod_args /* { 1268 syscallarg(const char *) path; 1269 syscallarg(int) mode; 1270 syscallarg(int) dev; 1271 } */ *uap = v; 1272 register struct vnode *vp; 1273 struct vattr vattr; 1274 int error; 1275 int whiteout = 0; 1276 struct nameidata nd; 1277 1278 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1279 return (error); 1280 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1281 if ((error = namei(&nd)) != 0) 1282 return (error); 1283 vp = nd.ni_vp; 1284 if (vp != NULL) 1285 error = EEXIST; 1286 else { 1287 VATTR_NULL(&vattr); 1288 vattr.va_mode = 1289 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1290 vattr.va_rdev = SCARG(uap, dev); 1291 whiteout = 0; 1292 1293 switch (SCARG(uap, mode) & S_IFMT) { 1294 case S_IFMT: /* used by badsect to flag bad sectors */ 1295 vattr.va_type = VBAD; 1296 break; 1297 case S_IFCHR: 1298 vattr.va_type = VCHR; 1299 break; 1300 case S_IFBLK: 1301 vattr.va_type = VBLK; 1302 break; 1303 case S_IFWHT: 1304 whiteout = 1; 1305 break; 1306 default: 1307 error = EINVAL; 1308 break; 1309 } 1310 } 1311 if (!error) { 1312 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1313 if (whiteout) { 1314 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1315 if (error) 1316 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1317 vput(nd.ni_dvp); 1318 } else { 1319 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1320 &nd.ni_cnd, &vattr); 1321 } 1322 } else { 1323 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1324 if (nd.ni_dvp == vp) 1325 vrele(nd.ni_dvp); 1326 else 1327 vput(nd.ni_dvp); 1328 if (vp) 1329 vrele(vp); 1330 } 1331 return (error); 1332 } 1333 1334 /* 1335 * Create a named pipe. 1336 */ 1337 /* ARGSUSED */ 1338 int 1339 sys_mkfifo(p, v, retval) 1340 struct proc *p; 1341 void *v; 1342 register_t *retval; 1343 { 1344 register struct sys_mkfifo_args /* { 1345 syscallarg(const char *) path; 1346 syscallarg(int) mode; 1347 } */ *uap = v; 1348 struct vattr vattr; 1349 int error; 1350 struct nameidata nd; 1351 1352 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1353 if ((error = namei(&nd)) != 0) 1354 return (error); 1355 if (nd.ni_vp != NULL) { 1356 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1357 if (nd.ni_dvp == nd.ni_vp) 1358 vrele(nd.ni_dvp); 1359 else 1360 vput(nd.ni_dvp); 1361 vrele(nd.ni_vp); 1362 return (EEXIST); 1363 } 1364 VATTR_NULL(&vattr); 1365 vattr.va_type = VFIFO; 1366 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1367 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1368 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1369 } 1370 1371 /* 1372 * Make a hard file link. 1373 */ 1374 /* ARGSUSED */ 1375 int 1376 sys_link(p, v, retval) 1377 struct proc *p; 1378 void *v; 1379 register_t *retval; 1380 { 1381 register struct sys_link_args /* { 1382 syscallarg(const char *) path; 1383 syscallarg(const char *) link; 1384 } */ *uap = v; 1385 register struct vnode *vp; 1386 struct nameidata nd; 1387 int error; 1388 1389 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1390 if ((error = namei(&nd)) != 0) 1391 return (error); 1392 vp = nd.ni_vp; 1393 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1394 if ((error = namei(&nd)) != 0) 1395 goto out; 1396 if (nd.ni_vp) { 1397 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1398 if (nd.ni_dvp == nd.ni_vp) 1399 vrele(nd.ni_dvp); 1400 else 1401 vput(nd.ni_dvp); 1402 vrele(nd.ni_vp); 1403 error = EEXIST; 1404 goto out; 1405 } 1406 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1407 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1408 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1409 out: 1410 vrele(vp); 1411 return (error); 1412 } 1413 1414 /* 1415 * Make a symbolic link. 1416 */ 1417 /* ARGSUSED */ 1418 int 1419 sys_symlink(p, v, retval) 1420 struct proc *p; 1421 void *v; 1422 register_t *retval; 1423 { 1424 register struct sys_symlink_args /* { 1425 syscallarg(const char *) path; 1426 syscallarg(const char *) link; 1427 } */ *uap = v; 1428 struct vattr vattr; 1429 char *path; 1430 int error; 1431 struct nameidata nd; 1432 1433 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1434 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1435 if (error) 1436 goto out; 1437 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1438 if ((error = namei(&nd)) != 0) 1439 goto out; 1440 if (nd.ni_vp) { 1441 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1442 if (nd.ni_dvp == nd.ni_vp) 1443 vrele(nd.ni_dvp); 1444 else 1445 vput(nd.ni_dvp); 1446 vrele(nd.ni_vp); 1447 error = EEXIST; 1448 goto out; 1449 } 1450 VATTR_NULL(&vattr); 1451 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1452 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1453 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1454 out: 1455 FREE(path, M_NAMEI); 1456 return (error); 1457 } 1458 1459 /* 1460 * Delete a whiteout from the filesystem. 1461 */ 1462 /* ARGSUSED */ 1463 int 1464 sys_undelete(p, v, retval) 1465 struct proc *p; 1466 void *v; 1467 register_t *retval; 1468 { 1469 register struct sys_undelete_args /* { 1470 syscallarg(const char *) path; 1471 } */ *uap = v; 1472 int error; 1473 struct nameidata nd; 1474 1475 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1476 SCARG(uap, path), p); 1477 error = namei(&nd); 1478 if (error) 1479 return (error); 1480 1481 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1482 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1483 if (nd.ni_dvp == nd.ni_vp) 1484 vrele(nd.ni_dvp); 1485 else 1486 vput(nd.ni_dvp); 1487 if (nd.ni_vp) 1488 vrele(nd.ni_vp); 1489 return (EEXIST); 1490 } 1491 1492 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1493 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1494 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1495 vput(nd.ni_dvp); 1496 return (error); 1497 } 1498 1499 /* 1500 * Delete a name from the filesystem. 1501 */ 1502 /* ARGSUSED */ 1503 int 1504 sys_unlink(p, v, retval) 1505 struct proc *p; 1506 void *v; 1507 register_t *retval; 1508 { 1509 struct sys_unlink_args /* { 1510 syscallarg(const char *) path; 1511 } */ *uap = v; 1512 register struct vnode *vp; 1513 int error; 1514 struct nameidata nd; 1515 1516 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1517 SCARG(uap, path), p); 1518 if ((error = namei(&nd)) != 0) 1519 return (error); 1520 vp = nd.ni_vp; 1521 1522 /* 1523 * The root of a mounted filesystem cannot be deleted. 1524 */ 1525 if (vp->v_flag & VROOT) { 1526 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1527 if (nd.ni_dvp == vp) 1528 vrele(nd.ni_dvp); 1529 else 1530 vput(nd.ni_dvp); 1531 vput(vp); 1532 error = EBUSY; 1533 goto out; 1534 } 1535 1536 (void)uvm_vnp_uncache(vp); 1537 1538 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1539 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1540 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1541 out: 1542 return (error); 1543 } 1544 1545 /* 1546 * Reposition read/write file offset. 1547 */ 1548 int 1549 sys_lseek(p, v, retval) 1550 struct proc *p; 1551 void *v; 1552 register_t *retval; 1553 { 1554 register struct sys_lseek_args /* { 1555 syscallarg(int) fd; 1556 syscallarg(int) pad; 1557 syscallarg(off_t) offset; 1558 syscallarg(int) whence; 1559 } */ *uap = v; 1560 struct ucred *cred = p->p_ucred; 1561 register struct filedesc *fdp = p->p_fd; 1562 register struct file *fp; 1563 struct vnode *vp; 1564 struct vattr vattr; 1565 register off_t newoff; 1566 int error; 1567 1568 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1569 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1570 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1571 return (EBADF); 1572 1573 FILE_USE(fp); 1574 1575 vp = (struct vnode *)fp->f_data; 1576 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1577 error = ESPIPE; 1578 goto out; 1579 } 1580 1581 switch (SCARG(uap, whence)) { 1582 case SEEK_CUR: 1583 newoff = fp->f_offset + SCARG(uap, offset); 1584 break; 1585 case SEEK_END: 1586 error = VOP_GETATTR(vp, &vattr, cred, p); 1587 if (error) 1588 goto out; 1589 newoff = SCARG(uap, offset) + vattr.va_size; 1590 break; 1591 case SEEK_SET: 1592 newoff = SCARG(uap, offset); 1593 break; 1594 default: 1595 error = EINVAL; 1596 goto out; 1597 } 1598 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1599 goto out; 1600 1601 *(off_t *)retval = fp->f_offset = newoff; 1602 out: 1603 FILE_UNUSE(fp, p); 1604 return (error); 1605 } 1606 1607 /* 1608 * Positional read system call. 1609 */ 1610 int 1611 sys_pread(p, v, retval) 1612 struct proc *p; 1613 void *v; 1614 register_t *retval; 1615 { 1616 struct sys_pread_args /* { 1617 syscallarg(int) fd; 1618 syscallarg(void *) buf; 1619 syscallarg(size_t) nbyte; 1620 syscallarg(off_t) offset; 1621 } */ *uap = v; 1622 struct filedesc *fdp = p->p_fd; 1623 struct file *fp; 1624 struct vnode *vp; 1625 off_t offset; 1626 int error, fd = SCARG(uap, fd); 1627 1628 if ((u_int)fd >= fdp->fd_nfiles || 1629 (fp = fdp->fd_ofiles[fd]) == NULL || 1630 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1631 (fp->f_flag & FREAD) == 0) 1632 return (EBADF); 1633 1634 FILE_USE(fp); 1635 1636 vp = (struct vnode *)fp->f_data; 1637 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1638 error = ESPIPE; 1639 goto out; 1640 } 1641 1642 offset = SCARG(uap, offset); 1643 1644 /* 1645 * XXX This works because no file systems actually 1646 * XXX take any action on the seek operation. 1647 */ 1648 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1649 goto out; 1650 1651 /* dofileread() will unuse the descriptor for us */ 1652 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1653 &offset, 0, retval)); 1654 1655 out: 1656 FILE_UNUSE(fp, p); 1657 return (error); 1658 } 1659 1660 /* 1661 * Positional scatter read system call. 1662 */ 1663 int 1664 sys_preadv(p, v, retval) 1665 struct proc *p; 1666 void *v; 1667 register_t *retval; 1668 { 1669 struct sys_preadv_args /* { 1670 syscallarg(int) fd; 1671 syscallarg(const struct iovec *) iovp; 1672 syscallarg(int) iovcnt; 1673 syscallarg(off_t) offset; 1674 } */ *uap = v; 1675 struct filedesc *fdp = p->p_fd; 1676 struct file *fp; 1677 struct vnode *vp; 1678 off_t offset; 1679 int error, fd = SCARG(uap, fd); 1680 1681 if ((u_int)fd >= fdp->fd_nfiles || 1682 (fp = fdp->fd_ofiles[fd]) == NULL || 1683 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1684 (fp->f_flag & FREAD) == 0) 1685 return (EBADF); 1686 1687 FILE_USE(fp); 1688 1689 vp = (struct vnode *)fp->f_data; 1690 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1691 error = ESPIPE; 1692 goto out; 1693 } 1694 1695 offset = SCARG(uap, offset); 1696 1697 /* 1698 * XXX This works because no file systems actually 1699 * XXX take any action on the seek operation. 1700 */ 1701 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1702 goto out; 1703 1704 /* dofilereadv() will unuse the descriptor for us */ 1705 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1706 &offset, 0, retval)); 1707 1708 out: 1709 FILE_UNUSE(fp, p); 1710 return (error); 1711 } 1712 1713 /* 1714 * Positional write system call. 1715 */ 1716 int 1717 sys_pwrite(p, v, retval) 1718 struct proc *p; 1719 void *v; 1720 register_t *retval; 1721 { 1722 struct sys_pwrite_args /* { 1723 syscallarg(int) fd; 1724 syscallarg(const void *) buf; 1725 syscallarg(size_t) nbyte; 1726 syscallarg(off_t) offset; 1727 } */ *uap = v; 1728 struct filedesc *fdp = p->p_fd; 1729 struct file *fp; 1730 struct vnode *vp; 1731 off_t offset; 1732 int error, fd = SCARG(uap, fd); 1733 1734 if ((u_int)fd >= fdp->fd_nfiles || 1735 (fp = fdp->fd_ofiles[fd]) == NULL || 1736 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1737 (fp->f_flag & FWRITE) == 0) 1738 return (EBADF); 1739 1740 FILE_USE(fp); 1741 1742 vp = (struct vnode *)fp->f_data; 1743 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1744 error = ESPIPE; 1745 goto out; 1746 } 1747 1748 offset = SCARG(uap, offset); 1749 1750 /* 1751 * XXX This works because no file systems actually 1752 * XXX take any action on the seek operation. 1753 */ 1754 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1755 goto out; 1756 1757 /* dofilewrite() will unuse the descriptor for us */ 1758 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1759 &offset, 0, retval)); 1760 1761 out: 1762 FILE_UNUSE(fp, p); 1763 return (error); 1764 } 1765 1766 /* 1767 * Positional gather write system call. 1768 */ 1769 int 1770 sys_pwritev(p, v, retval) 1771 struct proc *p; 1772 void *v; 1773 register_t *retval; 1774 { 1775 struct sys_pwritev_args /* { 1776 syscallarg(int) fd; 1777 syscallarg(const struct iovec *) iovp; 1778 syscallarg(int) iovcnt; 1779 syscallarg(off_t) offset; 1780 } */ *uap = v; 1781 struct filedesc *fdp = p->p_fd; 1782 struct file *fp; 1783 struct vnode *vp; 1784 off_t offset; 1785 int error, fd = SCARG(uap, fd); 1786 1787 if ((u_int)fd >= fdp->fd_nfiles || 1788 (fp = fdp->fd_ofiles[fd]) == NULL || 1789 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1790 (fp->f_flag & FWRITE) == 0) 1791 return (EBADF); 1792 1793 FILE_USE(fp); 1794 1795 vp = (struct vnode *)fp->f_data; 1796 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1797 error = ESPIPE; 1798 goto out; 1799 } 1800 1801 offset = SCARG(uap, offset); 1802 1803 /* 1804 * XXX This works because no file systems actually 1805 * XXX take any action on the seek operation. 1806 */ 1807 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1808 goto out; 1809 1810 /* dofilewritev() will unuse the descriptor for us */ 1811 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1812 &offset, 0, retval)); 1813 1814 out: 1815 FILE_UNUSE(fp, p); 1816 return (error); 1817 } 1818 1819 /* 1820 * Check access permissions. 1821 */ 1822 int 1823 sys_access(p, v, retval) 1824 struct proc *p; 1825 void *v; 1826 register_t *retval; 1827 { 1828 register struct sys_access_args /* { 1829 syscallarg(const char *) path; 1830 syscallarg(int) flags; 1831 } */ *uap = v; 1832 register struct ucred *cred = p->p_ucred; 1833 register struct vnode *vp; 1834 int error, flags, t_gid, t_uid; 1835 struct nameidata nd; 1836 1837 t_uid = cred->cr_uid; 1838 t_gid = cred->cr_gid; 1839 cred->cr_uid = p->p_cred->p_ruid; 1840 cred->cr_gid = p->p_cred->p_rgid; 1841 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1842 SCARG(uap, path), p); 1843 if ((error = namei(&nd)) != 0) 1844 goto out1; 1845 vp = nd.ni_vp; 1846 1847 /* Flags == 0 means only check for existence. */ 1848 if (SCARG(uap, flags)) { 1849 flags = 0; 1850 if (SCARG(uap, flags) & R_OK) 1851 flags |= VREAD; 1852 if (SCARG(uap, flags) & W_OK) 1853 flags |= VWRITE; 1854 if (SCARG(uap, flags) & X_OK) 1855 flags |= VEXEC; 1856 1857 error = VOP_ACCESS(vp, flags, cred, p); 1858 if (!error && (flags & VWRITE)) 1859 error = vn_writechk(vp); 1860 } 1861 vput(vp); 1862 out1: 1863 cred->cr_uid = t_uid; 1864 cred->cr_gid = t_gid; 1865 return (error); 1866 } 1867 1868 /* 1869 * Get file status; this version follows links. 1870 */ 1871 /* ARGSUSED */ 1872 int 1873 sys___stat13(p, v, retval) 1874 struct proc *p; 1875 void *v; 1876 register_t *retval; 1877 { 1878 register struct sys___stat13_args /* { 1879 syscallarg(const char *) path; 1880 syscallarg(struct stat *) ub; 1881 } */ *uap = v; 1882 struct stat sb; 1883 int error; 1884 struct nameidata nd; 1885 1886 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1887 SCARG(uap, path), p); 1888 if ((error = namei(&nd)) != 0) 1889 return (error); 1890 error = vn_stat(nd.ni_vp, &sb, p); 1891 vput(nd.ni_vp); 1892 if (error) 1893 return (error); 1894 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1895 return (error); 1896 } 1897 1898 /* 1899 * Get file status; this version does not follow links. 1900 */ 1901 /* ARGSUSED */ 1902 int 1903 sys___lstat13(p, v, retval) 1904 struct proc *p; 1905 void *v; 1906 register_t *retval; 1907 { 1908 register struct sys___lstat13_args /* { 1909 syscallarg(const char *) path; 1910 syscallarg(struct stat *) ub; 1911 } */ *uap = v; 1912 struct stat sb; 1913 int error; 1914 struct nameidata nd; 1915 1916 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1917 SCARG(uap, path), p); 1918 if ((error = namei(&nd)) != 0) 1919 return (error); 1920 error = vn_stat(nd.ni_vp, &sb, p); 1921 vput(nd.ni_vp); 1922 if (error) 1923 return (error); 1924 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1925 return (error); 1926 } 1927 1928 /* 1929 * Get configurable pathname variables. 1930 */ 1931 /* ARGSUSED */ 1932 int 1933 sys_pathconf(p, v, retval) 1934 struct proc *p; 1935 void *v; 1936 register_t *retval; 1937 { 1938 register struct sys_pathconf_args /* { 1939 syscallarg(const char *) path; 1940 syscallarg(int) name; 1941 } */ *uap = v; 1942 int error; 1943 struct nameidata nd; 1944 1945 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1946 SCARG(uap, path), p); 1947 if ((error = namei(&nd)) != 0) 1948 return (error); 1949 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1950 vput(nd.ni_vp); 1951 return (error); 1952 } 1953 1954 /* 1955 * Return target name of a symbolic link. 1956 */ 1957 /* ARGSUSED */ 1958 int 1959 sys_readlink(p, v, retval) 1960 struct proc *p; 1961 void *v; 1962 register_t *retval; 1963 { 1964 register struct sys_readlink_args /* { 1965 syscallarg(const char *) path; 1966 syscallarg(char *) buf; 1967 syscallarg(size_t) count; 1968 } */ *uap = v; 1969 register struct vnode *vp; 1970 struct iovec aiov; 1971 struct uio auio; 1972 int error; 1973 struct nameidata nd; 1974 1975 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1976 SCARG(uap, path), p); 1977 if ((error = namei(&nd)) != 0) 1978 return (error); 1979 vp = nd.ni_vp; 1980 if (vp->v_type != VLNK) 1981 error = EINVAL; 1982 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1983 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1984 aiov.iov_base = SCARG(uap, buf); 1985 aiov.iov_len = SCARG(uap, count); 1986 auio.uio_iov = &aiov; 1987 auio.uio_iovcnt = 1; 1988 auio.uio_offset = 0; 1989 auio.uio_rw = UIO_READ; 1990 auio.uio_segflg = UIO_USERSPACE; 1991 auio.uio_procp = p; 1992 auio.uio_resid = SCARG(uap, count); 1993 error = VOP_READLINK(vp, &auio, p->p_ucred); 1994 } 1995 vput(vp); 1996 *retval = SCARG(uap, count) - auio.uio_resid; 1997 return (error); 1998 } 1999 2000 /* 2001 * Change flags of a file given a path name. 2002 */ 2003 /* ARGSUSED */ 2004 int 2005 sys_chflags(p, v, retval) 2006 struct proc *p; 2007 void *v; 2008 register_t *retval; 2009 { 2010 register struct sys_chflags_args /* { 2011 syscallarg(const char *) path; 2012 syscallarg(u_long) flags; 2013 } */ *uap = v; 2014 register struct vnode *vp; 2015 struct vattr vattr; 2016 int error; 2017 struct nameidata nd; 2018 2019 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2020 if ((error = namei(&nd)) != 0) 2021 return (error); 2022 vp = nd.ni_vp; 2023 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2024 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2025 VATTR_NULL(&vattr); 2026 vattr.va_flags = SCARG(uap, flags); 2027 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2028 vput(vp); 2029 return (error); 2030 } 2031 2032 /* 2033 * Change flags of a file given a file descriptor. 2034 */ 2035 /* ARGSUSED */ 2036 int 2037 sys_fchflags(p, v, retval) 2038 struct proc *p; 2039 void *v; 2040 register_t *retval; 2041 { 2042 register struct sys_fchflags_args /* { 2043 syscallarg(int) fd; 2044 syscallarg(u_long) flags; 2045 } */ *uap = v; 2046 struct vattr vattr; 2047 struct vnode *vp; 2048 struct file *fp; 2049 int error; 2050 2051 /* getvnode() will use the descriptor for us */ 2052 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2053 return (error); 2054 vp = (struct vnode *)fp->f_data; 2055 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2056 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2057 VATTR_NULL(&vattr); 2058 vattr.va_flags = SCARG(uap, flags); 2059 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2060 VOP_UNLOCK(vp, 0); 2061 FILE_UNUSE(fp, p); 2062 return (error); 2063 } 2064 2065 /* 2066 * Change mode of a file given path name; this version follows links. 2067 */ 2068 /* ARGSUSED */ 2069 int 2070 sys_chmod(p, v, retval) 2071 struct proc *p; 2072 void *v; 2073 register_t *retval; 2074 { 2075 register struct sys_chmod_args /* { 2076 syscallarg(const char *) path; 2077 syscallarg(int) mode; 2078 } */ *uap = v; 2079 int error; 2080 struct nameidata nd; 2081 2082 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2083 if ((error = namei(&nd)) != 0) 2084 return (error); 2085 2086 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2087 2088 vrele(nd.ni_vp); 2089 return (error); 2090 } 2091 2092 /* 2093 * Change mode of a file given a file descriptor. 2094 */ 2095 /* ARGSUSED */ 2096 int 2097 sys_fchmod(p, v, retval) 2098 struct proc *p; 2099 void *v; 2100 register_t *retval; 2101 { 2102 register struct sys_fchmod_args /* { 2103 syscallarg(int) fd; 2104 syscallarg(int) mode; 2105 } */ *uap = v; 2106 struct file *fp; 2107 int error; 2108 2109 /* getvnode() will use the descriptor for us */ 2110 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2111 return (error); 2112 2113 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2114 FILE_UNUSE(fp, p); 2115 return (error); 2116 } 2117 2118 /* 2119 * Change mode of a file given path name; this version does not follow links. 2120 */ 2121 /* ARGSUSED */ 2122 int 2123 sys_lchmod(p, v, retval) 2124 struct proc *p; 2125 void *v; 2126 register_t *retval; 2127 { 2128 register struct sys_lchmod_args /* { 2129 syscallarg(const char *) path; 2130 syscallarg(int) mode; 2131 } */ *uap = v; 2132 int error; 2133 struct nameidata nd; 2134 2135 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2136 if ((error = namei(&nd)) != 0) 2137 return (error); 2138 2139 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2140 2141 vrele(nd.ni_vp); 2142 return (error); 2143 } 2144 2145 /* 2146 * Common routine to set mode given a vnode. 2147 */ 2148 static int 2149 change_mode(vp, mode, p) 2150 struct vnode *vp; 2151 int mode; 2152 struct proc *p; 2153 { 2154 struct vattr vattr; 2155 int error; 2156 2157 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2158 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2159 VATTR_NULL(&vattr); 2160 vattr.va_mode = mode & ALLPERMS; 2161 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2162 VOP_UNLOCK(vp, 0); 2163 return (error); 2164 } 2165 2166 /* 2167 * Set ownership given a path name; this version follows links. 2168 */ 2169 /* ARGSUSED */ 2170 int 2171 sys_chown(p, v, retval) 2172 struct proc *p; 2173 void *v; 2174 register_t *retval; 2175 { 2176 register struct sys_chown_args /* { 2177 syscallarg(const char *) path; 2178 syscallarg(uid_t) uid; 2179 syscallarg(gid_t) gid; 2180 } */ *uap = v; 2181 int error; 2182 struct nameidata nd; 2183 2184 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2185 if ((error = namei(&nd)) != 0) 2186 return (error); 2187 2188 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2189 2190 vrele(nd.ni_vp); 2191 return (error); 2192 } 2193 2194 /* 2195 * Set ownership given a path name; this version follows links. 2196 * Provides POSIX semantics. 2197 */ 2198 /* ARGSUSED */ 2199 int 2200 sys___posix_chown(p, v, retval) 2201 struct proc *p; 2202 void *v; 2203 register_t *retval; 2204 { 2205 register struct sys_chown_args /* { 2206 syscallarg(const char *) path; 2207 syscallarg(uid_t) uid; 2208 syscallarg(gid_t) gid; 2209 } */ *uap = v; 2210 int error; 2211 struct nameidata nd; 2212 2213 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2214 if ((error = namei(&nd)) != 0) 2215 return (error); 2216 2217 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2218 2219 vrele(nd.ni_vp); 2220 return (error); 2221 } 2222 2223 /* 2224 * Set ownership given a file descriptor. 2225 */ 2226 /* ARGSUSED */ 2227 int 2228 sys_fchown(p, v, retval) 2229 struct proc *p; 2230 void *v; 2231 register_t *retval; 2232 { 2233 register struct sys_fchown_args /* { 2234 syscallarg(int) fd; 2235 syscallarg(uid_t) uid; 2236 syscallarg(gid_t) gid; 2237 } */ *uap = v; 2238 int error; 2239 struct file *fp; 2240 2241 /* getvnode() will use the descriptor for us */ 2242 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2243 return (error); 2244 2245 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2246 SCARG(uap, gid), p, 0); 2247 FILE_UNUSE(fp, p); 2248 return (error); 2249 } 2250 2251 /* 2252 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2253 */ 2254 /* ARGSUSED */ 2255 int 2256 sys___posix_fchown(p, v, retval) 2257 struct proc *p; 2258 void *v; 2259 register_t *retval; 2260 { 2261 register struct sys_fchown_args /* { 2262 syscallarg(int) fd; 2263 syscallarg(uid_t) uid; 2264 syscallarg(gid_t) gid; 2265 } */ *uap = v; 2266 int error; 2267 struct file *fp; 2268 2269 /* getvnode() will use the descriptor for us */ 2270 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2271 return (error); 2272 2273 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2274 SCARG(uap, gid), p, 1); 2275 FILE_UNUSE(fp, p); 2276 return (error); 2277 } 2278 2279 /* 2280 * Set ownership given a path name; this version does not follow links. 2281 */ 2282 /* ARGSUSED */ 2283 int 2284 sys_lchown(p, v, retval) 2285 struct proc *p; 2286 void *v; 2287 register_t *retval; 2288 { 2289 register struct sys_lchown_args /* { 2290 syscallarg(const char *) path; 2291 syscallarg(uid_t) uid; 2292 syscallarg(gid_t) gid; 2293 } */ *uap = v; 2294 int error; 2295 struct nameidata nd; 2296 2297 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2298 if ((error = namei(&nd)) != 0) 2299 return (error); 2300 2301 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2302 2303 vrele(nd.ni_vp); 2304 return (error); 2305 } 2306 2307 /* 2308 * Set ownership given a path name; this version does not follow links. 2309 * Provides POSIX/XPG semantics. 2310 */ 2311 /* ARGSUSED */ 2312 int 2313 sys___posix_lchown(p, v, retval) 2314 struct proc *p; 2315 void *v; 2316 register_t *retval; 2317 { 2318 register struct sys_lchown_args /* { 2319 syscallarg(const char *) path; 2320 syscallarg(uid_t) uid; 2321 syscallarg(gid_t) gid; 2322 } */ *uap = v; 2323 int error; 2324 struct nameidata nd; 2325 2326 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2327 if ((error = namei(&nd)) != 0) 2328 return (error); 2329 2330 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2331 2332 vrele(nd.ni_vp); 2333 return (error); 2334 } 2335 2336 /* 2337 * Common routine to set ownership given a vnode. 2338 */ 2339 static int 2340 change_owner(vp, uid, gid, p, posix_semantics) 2341 register struct vnode *vp; 2342 uid_t uid; 2343 gid_t gid; 2344 struct proc *p; 2345 int posix_semantics; 2346 { 2347 struct vattr vattr; 2348 mode_t newmode; 2349 int error; 2350 2351 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2352 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2353 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2354 goto out; 2355 2356 #define CHANGED(x) ((x) != -1) 2357 newmode = vattr.va_mode; 2358 if (posix_semantics) { 2359 /* 2360 * POSIX/XPG semantics: if the caller is not the super-user, 2361 * clear set-user-id and set-group-id bits. Both POSIX and 2362 * the XPG consider the behaviour for calls by the super-user 2363 * implementation-defined; we leave the set-user-id and set- 2364 * group-id settings intact in that case. 2365 */ 2366 if (suser(p->p_ucred, NULL) != 0) 2367 newmode &= ~(S_ISUID | S_ISGID); 2368 } else { 2369 /* 2370 * NetBSD semantics: when changing owner and/or group, 2371 * clear the respective bit(s). 2372 */ 2373 if (CHANGED(uid)) 2374 newmode &= ~S_ISUID; 2375 if (CHANGED(gid)) 2376 newmode &= ~S_ISGID; 2377 } 2378 /* Update va_mode iff altered. */ 2379 if (vattr.va_mode == newmode) 2380 newmode = VNOVAL; 2381 2382 VATTR_NULL(&vattr); 2383 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2384 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2385 vattr.va_mode = newmode; 2386 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2387 #undef CHANGED 2388 2389 out: 2390 VOP_UNLOCK(vp, 0); 2391 return (error); 2392 } 2393 2394 /* 2395 * Set the access and modification times given a path name; this 2396 * version follows links. 2397 */ 2398 /* ARGSUSED */ 2399 int 2400 sys_utimes(p, v, retval) 2401 struct proc *p; 2402 void *v; 2403 register_t *retval; 2404 { 2405 register struct sys_utimes_args /* { 2406 syscallarg(const char *) path; 2407 syscallarg(const struct timeval *) tptr; 2408 } */ *uap = v; 2409 int error; 2410 struct nameidata nd; 2411 2412 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2413 if ((error = namei(&nd)) != 0) 2414 return (error); 2415 2416 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2417 2418 vrele(nd.ni_vp); 2419 return (error); 2420 } 2421 2422 /* 2423 * Set the access and modification times given a file descriptor. 2424 */ 2425 /* ARGSUSED */ 2426 int 2427 sys_futimes(p, v, retval) 2428 struct proc *p; 2429 void *v; 2430 register_t *retval; 2431 { 2432 register struct sys_futimes_args /* { 2433 syscallarg(int) fd; 2434 syscallarg(const struct timeval *) tptr; 2435 } */ *uap = v; 2436 int error; 2437 struct file *fp; 2438 2439 /* getvnode() will use the descriptor for us */ 2440 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2441 return (error); 2442 2443 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2444 FILE_UNUSE(fp, p); 2445 return (error); 2446 } 2447 2448 /* 2449 * Set the access and modification times given a path name; this 2450 * version does not follow links. 2451 */ 2452 /* ARGSUSED */ 2453 int 2454 sys_lutimes(p, v, retval) 2455 struct proc *p; 2456 void *v; 2457 register_t *retval; 2458 { 2459 register struct sys_lutimes_args /* { 2460 syscallarg(const char *) path; 2461 syscallarg(const struct timeval *) tptr; 2462 } */ *uap = v; 2463 int error; 2464 struct nameidata nd; 2465 2466 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2467 if ((error = namei(&nd)) != 0) 2468 return (error); 2469 2470 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2471 2472 vrele(nd.ni_vp); 2473 return (error); 2474 } 2475 2476 /* 2477 * Common routine to set access and modification times given a vnode. 2478 */ 2479 static int 2480 change_utimes(vp, tptr, p) 2481 struct vnode *vp; 2482 const struct timeval *tptr; 2483 struct proc *p; 2484 { 2485 struct timeval tv[2]; 2486 struct vattr vattr; 2487 int error; 2488 2489 VATTR_NULL(&vattr); 2490 if (tptr == NULL) { 2491 microtime(&tv[0]); 2492 tv[1] = tv[0]; 2493 vattr.va_vaflags |= VA_UTIMES_NULL; 2494 } else { 2495 error = copyin(tptr, tv, sizeof(tv)); 2496 if (error) 2497 return (error); 2498 } 2499 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2500 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2501 vattr.va_atime.tv_sec = tv[0].tv_sec; 2502 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2503 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2504 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2505 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2506 VOP_UNLOCK(vp, 0); 2507 return (error); 2508 } 2509 2510 /* 2511 * Truncate a file given its path name. 2512 */ 2513 /* ARGSUSED */ 2514 int 2515 sys_truncate(p, v, retval) 2516 struct proc *p; 2517 void *v; 2518 register_t *retval; 2519 { 2520 register struct sys_truncate_args /* { 2521 syscallarg(const char *) path; 2522 syscallarg(int) pad; 2523 syscallarg(off_t) length; 2524 } */ *uap = v; 2525 register struct vnode *vp; 2526 struct vattr vattr; 2527 int error; 2528 struct nameidata nd; 2529 2530 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2531 if ((error = namei(&nd)) != 0) 2532 return (error); 2533 vp = nd.ni_vp; 2534 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2535 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2536 if (vp->v_type == VDIR) 2537 error = EISDIR; 2538 else if ((error = vn_writechk(vp)) == 0 && 2539 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2540 VATTR_NULL(&vattr); 2541 vattr.va_size = SCARG(uap, length); 2542 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2543 } 2544 vput(vp); 2545 return (error); 2546 } 2547 2548 /* 2549 * Truncate a file given a file descriptor. 2550 */ 2551 /* ARGSUSED */ 2552 int 2553 sys_ftruncate(p, v, retval) 2554 struct proc *p; 2555 void *v; 2556 register_t *retval; 2557 { 2558 register struct sys_ftruncate_args /* { 2559 syscallarg(int) fd; 2560 syscallarg(int) pad; 2561 syscallarg(off_t) length; 2562 } */ *uap = v; 2563 struct vattr vattr; 2564 struct vnode *vp; 2565 struct file *fp; 2566 int error; 2567 2568 /* getvnode() will use the descriptor for us */ 2569 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2570 return (error); 2571 if ((fp->f_flag & FWRITE) == 0) { 2572 error = EINVAL; 2573 goto out; 2574 } 2575 vp = (struct vnode *)fp->f_data; 2576 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2577 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2578 if (vp->v_type == VDIR) 2579 error = EISDIR; 2580 else if ((error = vn_writechk(vp)) == 0) { 2581 VATTR_NULL(&vattr); 2582 vattr.va_size = SCARG(uap, length); 2583 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2584 } 2585 VOP_UNLOCK(vp, 0); 2586 out: 2587 FILE_UNUSE(fp, p); 2588 return (error); 2589 } 2590 2591 /* 2592 * Sync an open file. 2593 */ 2594 /* ARGSUSED */ 2595 int 2596 sys_fsync(p, v, retval) 2597 struct proc *p; 2598 void *v; 2599 register_t *retval; 2600 { 2601 struct sys_fsync_args /* { 2602 syscallarg(int) fd; 2603 } */ *uap = v; 2604 register struct vnode *vp; 2605 struct file *fp; 2606 int error; 2607 2608 /* getvnode() will use the descriptor for us */ 2609 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2610 return (error); 2611 vp = (struct vnode *)fp->f_data; 2612 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2613 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2614 VOP_UNLOCK(vp, 0); 2615 FILE_UNUSE(fp, p); 2616 return (error); 2617 } 2618 2619 /* 2620 * Sync the data of an open file. 2621 */ 2622 /* ARGSUSED */ 2623 int 2624 sys_fdatasync(p, v, retval) 2625 struct proc *p; 2626 void *v; 2627 register_t *retval; 2628 { 2629 struct sys_fdatasync_args /* { 2630 syscallarg(int) fd; 2631 } */ *uap = v; 2632 struct vnode *vp; 2633 struct file *fp; 2634 int error; 2635 2636 /* getvnode() will use the descriptor for us */ 2637 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2638 return (error); 2639 vp = (struct vnode *)fp->f_data; 2640 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2641 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2642 VOP_UNLOCK(vp, 0); 2643 FILE_UNUSE(fp, p); 2644 return (error); 2645 } 2646 2647 /* 2648 * Rename files, (standard) BSD semantics frontend. 2649 */ 2650 /* ARGSUSED */ 2651 int 2652 sys_rename(p, v, retval) 2653 struct proc *p; 2654 void *v; 2655 register_t *retval; 2656 { 2657 register struct sys_rename_args /* { 2658 syscallarg(const char *) from; 2659 syscallarg(const char *) to; 2660 } */ *uap = v; 2661 2662 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2663 } 2664 2665 /* 2666 * Rename files, POSIX semantics frontend. 2667 */ 2668 /* ARGSUSED */ 2669 int 2670 sys___posix_rename(p, v, retval) 2671 struct proc *p; 2672 void *v; 2673 register_t *retval; 2674 { 2675 register struct sys___posix_rename_args /* { 2676 syscallarg(const char *) from; 2677 syscallarg(const char *) to; 2678 } */ *uap = v; 2679 2680 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2681 } 2682 2683 /* 2684 * Rename files. Source and destination must either both be directories, 2685 * or both not be directories. If target is a directory, it must be empty. 2686 * If `from' and `to' refer to the same object, the value of the `retain' 2687 * argument is used to determine whether `from' will be 2688 * 2689 * (retain == 0) deleted unless `from' and `to' refer to the same 2690 * object in the file system's name space (BSD). 2691 * (retain == 1) always retained (POSIX). 2692 */ 2693 static int 2694 rename_files(from, to, p, retain) 2695 const char *from, *to; 2696 struct proc *p; 2697 int retain; 2698 { 2699 register struct vnode *tvp, *fvp, *tdvp; 2700 struct nameidata fromnd, tond; 2701 int error; 2702 2703 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2704 from, p); 2705 if ((error = namei(&fromnd)) != 0) 2706 return (error); 2707 fvp = fromnd.ni_vp; 2708 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2709 UIO_USERSPACE, to, p); 2710 if ((error = namei(&tond)) != 0) { 2711 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2712 vrele(fromnd.ni_dvp); 2713 vrele(fvp); 2714 goto out1; 2715 } 2716 tdvp = tond.ni_dvp; 2717 tvp = tond.ni_vp; 2718 2719 if (tvp != NULL) { 2720 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2721 error = ENOTDIR; 2722 goto out; 2723 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2724 error = EISDIR; 2725 goto out; 2726 } 2727 } 2728 2729 if (fvp == tdvp) 2730 error = EINVAL; 2731 2732 /* 2733 * Source and destination refer to the same object. 2734 */ 2735 if (fvp == tvp) { 2736 if (retain) 2737 error = -1; 2738 else if (fromnd.ni_dvp == tdvp && 2739 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2740 !memcmp(fromnd.ni_cnd.cn_nameptr, 2741 tond.ni_cnd.cn_nameptr, 2742 fromnd.ni_cnd.cn_namelen)) 2743 error = -1; 2744 } 2745 2746 out: 2747 if (!error) { 2748 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2749 if (fromnd.ni_dvp != tdvp) 2750 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2751 if (tvp) { 2752 (void)uvm_vnp_uncache(tvp); 2753 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2754 } 2755 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2756 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2757 } else { 2758 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2759 if (tdvp == tvp) 2760 vrele(tdvp); 2761 else 2762 vput(tdvp); 2763 if (tvp) 2764 vput(tvp); 2765 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2766 vrele(fromnd.ni_dvp); 2767 vrele(fvp); 2768 } 2769 vrele(tond.ni_startdir); 2770 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2771 out1: 2772 if (fromnd.ni_startdir) 2773 vrele(fromnd.ni_startdir); 2774 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2775 return (error == -1 ? 0 : error); 2776 } 2777 2778 /* 2779 * Make a directory file. 2780 */ 2781 /* ARGSUSED */ 2782 int 2783 sys_mkdir(p, v, retval) 2784 struct proc *p; 2785 void *v; 2786 register_t *retval; 2787 { 2788 register struct sys_mkdir_args /* { 2789 syscallarg(const char *) path; 2790 syscallarg(int) mode; 2791 } */ *uap = v; 2792 register struct vnode *vp; 2793 struct vattr vattr; 2794 int error; 2795 struct nameidata nd; 2796 2797 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2798 if ((error = namei(&nd)) != 0) 2799 return (error); 2800 vp = nd.ni_vp; 2801 if (vp != NULL) { 2802 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2803 if (nd.ni_dvp == vp) 2804 vrele(nd.ni_dvp); 2805 else 2806 vput(nd.ni_dvp); 2807 vrele(vp); 2808 return (EEXIST); 2809 } 2810 VATTR_NULL(&vattr); 2811 vattr.va_type = VDIR; 2812 vattr.va_mode = 2813 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2814 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2815 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2816 if (!error) 2817 vput(nd.ni_vp); 2818 return (error); 2819 } 2820 2821 /* 2822 * Remove a directory file. 2823 */ 2824 /* ARGSUSED */ 2825 int 2826 sys_rmdir(p, v, retval) 2827 struct proc *p; 2828 void *v; 2829 register_t *retval; 2830 { 2831 struct sys_rmdir_args /* { 2832 syscallarg(const char *) path; 2833 } */ *uap = v; 2834 register struct vnode *vp; 2835 int error; 2836 struct nameidata nd; 2837 2838 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2839 SCARG(uap, path), p); 2840 if ((error = namei(&nd)) != 0) 2841 return (error); 2842 vp = nd.ni_vp; 2843 if (vp->v_type != VDIR) { 2844 error = ENOTDIR; 2845 goto out; 2846 } 2847 /* 2848 * No rmdir "." please. 2849 */ 2850 if (nd.ni_dvp == vp) { 2851 error = EINVAL; 2852 goto out; 2853 } 2854 /* 2855 * The root of a mounted filesystem cannot be deleted. 2856 */ 2857 if (vp->v_flag & VROOT) 2858 error = EBUSY; 2859 out: 2860 if (!error) { 2861 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2862 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2863 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2864 } else { 2865 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2866 if (nd.ni_dvp == vp) 2867 vrele(nd.ni_dvp); 2868 else 2869 vput(nd.ni_dvp); 2870 vput(vp); 2871 } 2872 return (error); 2873 } 2874 2875 /* 2876 * Read a block of directory entries in a file system independent format. 2877 */ 2878 int 2879 sys_getdents(p, v, retval) 2880 struct proc *p; 2881 void *v; 2882 register_t *retval; 2883 { 2884 register struct sys_getdents_args /* { 2885 syscallarg(int) fd; 2886 syscallarg(char *) buf; 2887 syscallarg(size_t) count; 2888 } */ *uap = v; 2889 struct file *fp; 2890 int error, done; 2891 2892 /* getvnode() will use the descriptor for us */ 2893 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2894 return (error); 2895 if ((fp->f_flag & FREAD) == 0) { 2896 error = EBADF; 2897 goto out; 2898 } 2899 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2900 SCARG(uap, count), &done, p, 0, 0); 2901 *retval = done; 2902 out: 2903 FILE_UNUSE(fp, p); 2904 return (error); 2905 } 2906 2907 /* 2908 * Set the mode mask for creation of filesystem nodes. 2909 */ 2910 int 2911 sys_umask(p, v, retval) 2912 struct proc *p; 2913 void *v; 2914 register_t *retval; 2915 { 2916 struct sys_umask_args /* { 2917 syscallarg(mode_t) newmask; 2918 } */ *uap = v; 2919 struct cwdinfo *cwdi; 2920 2921 cwdi = p->p_cwdi; 2922 *retval = cwdi->cwdi_cmask; 2923 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2924 return (0); 2925 } 2926 2927 /* 2928 * Void all references to file by ripping underlying filesystem 2929 * away from vnode. 2930 */ 2931 /* ARGSUSED */ 2932 int 2933 sys_revoke(p, v, retval) 2934 struct proc *p; 2935 void *v; 2936 register_t *retval; 2937 { 2938 register struct sys_revoke_args /* { 2939 syscallarg(const char *) path; 2940 } */ *uap = v; 2941 register struct vnode *vp; 2942 struct vattr vattr; 2943 int error; 2944 struct nameidata nd; 2945 2946 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2947 if ((error = namei(&nd)) != 0) 2948 return (error); 2949 vp = nd.ni_vp; 2950 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2951 goto out; 2952 if (p->p_ucred->cr_uid != vattr.va_uid && 2953 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2954 goto out; 2955 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2956 VOP_REVOKE(vp, REVOKEALL); 2957 out: 2958 vrele(vp); 2959 return (error); 2960 } 2961 2962 /* 2963 * Convert a user file descriptor to a kernel file entry. 2964 */ 2965 int 2966 getvnode(fdp, fd, fpp) 2967 struct filedesc *fdp; 2968 int fd; 2969 struct file **fpp; 2970 { 2971 struct vnode *vp; 2972 struct file *fp; 2973 2974 if ((u_int)fd >= fdp->fd_nfiles || 2975 (fp = fdp->fd_ofiles[fd]) == NULL || 2976 (fp->f_iflags & FIF_WANTCLOSE) != 0) 2977 return (EBADF); 2978 2979 FILE_USE(fp); 2980 2981 if (fp->f_type != DTYPE_VNODE) { 2982 FILE_UNUSE(fp, NULL); 2983 return (EINVAL); 2984 } 2985 2986 vp = (struct vnode *)fp->f_data; 2987 if (vp->v_type == VBAD) { 2988 FILE_UNUSE(fp, NULL); 2989 return (EBADF); 2990 } 2991 2992 *fpp = fp; 2993 return (0); 2994 } 2995
Indexes created Fri Oct 03 02:09:57 GMT 2025