vfs_syscalls.c revision 1.136
1 /* $NetBSD: vfs_syscalls.c,v 1.136 1999/05/06 17:11:04 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 41 */ 42 43 #include "opt_compat_netbsd.h" 44 #include "opt_compat_43.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/namei.h> 49 #include <sys/filedesc.h> 50 #include <sys/kernel.h> 51 #include <sys/file.h> 52 #include <sys/stat.h> 53 #include <sys/vnode.h> 54 #include <sys/mount.h> 55 #include <sys/proc.h> 56 #include <sys/uio.h> 57 #include <sys/malloc.h> 58 #include <sys/dirent.h> 59 60 #include <sys/syscallargs.h> 61 62 #include <vm/vm.h> 63 #include <sys/sysctl.h> 64 65 #include <uvm/uvm_extern.h> 66 67 static int change_dir __P((struct nameidata *, struct proc *)); 68 static int change_mode __P((struct vnode *, int, struct proc *p)); 69 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 70 int)); 71 static int change_utimes __P((struct vnode *vp, const struct timeval *, 72 struct proc *p)); 73 static int rename_files __P((const char *, const char *, struct proc *, int)); 74 75 void checkdirs __P((struct vnode *)); 76 int dounmount __P((struct mount *, int, struct proc *)); 77 78 /* 79 * Virtual File System System Calls 80 */ 81 82 /* 83 * Mount a file system. 84 */ 85 86 /* 87 * This table is used to maintain compatibility with 4.3BSD 88 * and NetBSD 0.9 mount syscalls. Note, the order is important! 89 * 90 * Also note that not all of these had actual numbers in 4.3BSD 91 * or NetBSD 0.9! 92 */ 93 const char *mountcompatnames[] = { 94 NULL, /* 0 = MOUNT_NONE */ 95 MOUNT_FFS, /* 1 */ 96 MOUNT_NFS, /* 2 */ 97 MOUNT_MFS, /* 3 */ 98 MOUNT_MSDOS, /* 4 */ 99 MOUNT_LFS, /* 5 */ 100 NULL, /* 6 = MOUNT_LOFS */ 101 MOUNT_FDESC, /* 7 */ 102 MOUNT_PORTAL, /* 8 */ 103 MOUNT_NULL, /* 9 */ 104 MOUNT_UMAP, /* 10 */ 105 MOUNT_KERNFS, /* 11 */ 106 MOUNT_PROCFS, /* 12 */ 107 MOUNT_AFS, /* 13 */ 108 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 109 MOUNT_UNION, /* 15 */ 110 MOUNT_ADOSFS, /* 16 */ 111 MOUNT_EXT2FS, /* 17 */ 112 MOUNT_CODA, /* 18 */ 113 MOUNT_FILECORE, /* 19 */ 114 MOUNT_NTFS, /* 20 */ 115 }; 116 const int nmountcompatnames = sizeof(mountcompatnames) / 117 sizeof(mountcompatnames[0]); 118 119 /* ARGSUSED */ 120 int 121 sys_mount(p, v, retval) 122 struct proc *p; 123 void *v; 124 register_t *retval; 125 { 126 register struct sys_mount_args /* { 127 syscallarg(const char *) type; 128 syscallarg(const char *) path; 129 syscallarg(int) flags; 130 syscallarg(void *) data; 131 } */ *uap = v; 132 struct vnode *vp; 133 struct mount *mp; 134 int error, flag = 0; 135 char fstypename[MFSNAMELEN]; 136 struct vattr va; 137 struct nameidata nd; 138 struct vfsops *vfs; 139 140 /* 141 * Get vnode to be covered 142 */ 143 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 144 SCARG(uap, path), p); 145 if ((error = namei(&nd)) != 0) 146 return (error); 147 vp = nd.ni_vp; 148 /* 149 * A lookup in VFS_MOUNT might result in an attempt to 150 * lock this vnode again, so make the lock resursive. 151 */ 152 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 153 if (SCARG(uap, flags) & MNT_UPDATE) { 154 if ((vp->v_flag & VROOT) == 0) { 155 vput(vp); 156 return (EINVAL); 157 } 158 mp = vp->v_mount; 159 flag = mp->mnt_flag; 160 vfs = mp->mnt_op; 161 /* 162 * We only allow the filesystem to be reloaded if it 163 * is currently mounted read-only. 164 */ 165 if ((SCARG(uap, flags) & MNT_RELOAD) && 166 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 167 vput(vp); 168 return (EOPNOTSUPP); /* Needs translation */ 169 } 170 /* 171 * In "highly secure" mode, don't let the caller do anything 172 * but downgrade a filesystem from read-write to read-only. 173 * (see also below; MNT_UPDATE is required.) 174 */ 175 if (securelevel >= 2 && 176 (SCARG(uap, flags) != 177 (mp->mnt_flag | MNT_RDONLY | 178 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 179 vput(vp); 180 return (EPERM); 181 } 182 mp->mnt_flag |= 183 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 184 /* 185 * Only root, or the user that did the original mount is 186 * permitted to update it. 187 */ 188 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 189 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 190 vput(vp); 191 return (error); 192 } 193 /* 194 * Do not allow NFS export by non-root users. For non-root 195 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 196 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 197 */ 198 if (p->p_ucred->cr_uid != 0) { 199 if (SCARG(uap, flags) & MNT_EXPORTED) { 200 vput(vp); 201 return (EPERM); 202 } 203 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 204 if (flag & MNT_NOEXEC) 205 SCARG(uap, flags) |= MNT_NOEXEC; 206 } 207 if (vfs_busy(mp, LK_NOWAIT, 0)) { 208 vput(vp); 209 return (EPERM); 210 } 211 VOP_UNLOCK(vp, 0); 212 goto update; 213 } else { 214 if (securelevel >= 2) 215 return (EPERM); 216 } 217 /* 218 * If the user is not root, ensure that they own the directory 219 * onto which we are attempting to mount. 220 */ 221 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 222 (va.va_uid != p->p_ucred->cr_uid && 223 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 224 vput(vp); 225 return (error); 226 } 227 /* 228 * Do not allow NFS export by non-root users. For non-root users, 229 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 230 * mount point is already MNT_NOEXEC. 231 */ 232 if (p->p_ucred->cr_uid != 0) { 233 if (SCARG(uap, flags) & MNT_EXPORTED) { 234 vput(vp); 235 return (EPERM); 236 } 237 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 238 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 239 SCARG(uap, flags) |= MNT_NOEXEC; 240 } 241 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 242 return (error); 243 if (vp->v_type != VDIR) { 244 vput(vp); 245 return (ENOTDIR); 246 } 247 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 248 if (error) { 249 #if defined(COMPAT_09) || defined(COMPAT_43) 250 /* 251 * Historically filesystem types were identified by number. 252 * If we get an integer for the filesystem type instead of a 253 * string, we check to see if it matches one of the historic 254 * filesystem types. 255 */ 256 u_long fsindex = (u_long)SCARG(uap, type); 257 if (fsindex >= nmountcompatnames || 258 mountcompatnames[fsindex] == NULL) { 259 vput(vp); 260 return (ENODEV); 261 } 262 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 263 #else 264 vput(vp); 265 return (error); 266 #endif 267 } 268 #ifdef COMPAT_10 269 /* Accept `ufs' as an alias for `ffs'. */ 270 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 271 strncpy(fstypename, "ffs", MFSNAMELEN); 272 #endif 273 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 274 vput(vp); 275 return (ENODEV); 276 } 277 if (vp->v_mountedhere != NULL) { 278 vput(vp); 279 return (EBUSY); 280 } 281 282 /* 283 * Allocate and initialize the file system. 284 */ 285 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 286 M_MOUNT, M_WAITOK); 287 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 288 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 289 (void)vfs_busy(mp, LK_NOWAIT, 0); 290 mp->mnt_op = vfs; 291 vfs->vfs_refcount++; 292 mp->mnt_vnodecovered = vp; 293 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 294 update: 295 /* 296 * Set the mount level flags. 297 */ 298 if (SCARG(uap, flags) & MNT_RDONLY) 299 mp->mnt_flag |= MNT_RDONLY; 300 else if (mp->mnt_flag & MNT_RDONLY) 301 mp->mnt_flag |= MNT_WANTRDWR; 302 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 303 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 304 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 305 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 306 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 307 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 308 /* 309 * Mount the filesystem. 310 */ 311 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 312 if (mp->mnt_flag & MNT_UPDATE) { 313 vrele(vp); 314 if (mp->mnt_flag & MNT_WANTRDWR) 315 mp->mnt_flag &= ~MNT_RDONLY; 316 mp->mnt_flag &=~ 317 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 318 if (error) 319 mp->mnt_flag = flag; 320 vfs_unbusy(mp); 321 return (error); 322 } 323 /* 324 * Put the new filesystem on the mount list after root. 325 */ 326 cache_purge(vp); 327 if (!error) { 328 vp->v_mountedhere = mp; 329 simple_lock(&mountlist_slock); 330 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 331 simple_unlock(&mountlist_slock); 332 checkdirs(vp); 333 VOP_UNLOCK(vp, 0); 334 vfs_unbusy(mp); 335 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 336 if ((error = VFS_START(mp, 0, p))) 337 vrele(vp); 338 } else { 339 vp->v_mountedhere = (struct mount *)0; 340 vfs->vfs_refcount--; 341 vfs_unbusy(mp); 342 free((caddr_t)mp, M_MOUNT); 343 vput(vp); 344 } 345 return (error); 346 } 347 348 /* 349 * Scan all active processes to see if any of them have a current 350 * or root directory onto which the new filesystem has just been 351 * mounted. If so, replace them with the new mount point. 352 */ 353 void 354 checkdirs(olddp) 355 struct vnode *olddp; 356 { 357 struct cwdinfo *cwdi; 358 struct vnode *newdp; 359 struct proc *p; 360 361 if (olddp->v_usecount == 1) 362 return; 363 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 364 panic("mount: lost mount"); 365 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 * Create a special file. 1005 */ 1006 /* ARGSUSED */ 1007 int 1008 sys_mknod(p, v, retval) 1009 struct proc *p; 1010 void *v; 1011 register_t *retval; 1012 { 1013 register struct sys_mknod_args /* { 1014 syscallarg(const char *) path; 1015 syscallarg(int) mode; 1016 syscallarg(int) dev; 1017 } */ *uap = v; 1018 register struct vnode *vp; 1019 struct vattr vattr; 1020 int error; 1021 int whiteout = 0; 1022 struct nameidata nd; 1023 1024 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1025 return (error); 1026 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1027 if ((error = namei(&nd)) != 0) 1028 return (error); 1029 vp = nd.ni_vp; 1030 if (vp != NULL) 1031 error = EEXIST; 1032 else { 1033 VATTR_NULL(&vattr); 1034 vattr.va_mode = 1035 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1036 vattr.va_rdev = SCARG(uap, dev); 1037 whiteout = 0; 1038 1039 switch (SCARG(uap, mode) & S_IFMT) { 1040 case S_IFMT: /* used by badsect to flag bad sectors */ 1041 vattr.va_type = VBAD; 1042 break; 1043 case S_IFCHR: 1044 vattr.va_type = VCHR; 1045 break; 1046 case S_IFBLK: 1047 vattr.va_type = VBLK; 1048 break; 1049 case S_IFWHT: 1050 whiteout = 1; 1051 break; 1052 default: 1053 error = EINVAL; 1054 break; 1055 } 1056 } 1057 if (!error) { 1058 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1059 if (whiteout) { 1060 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1061 if (error) 1062 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1063 vput(nd.ni_dvp); 1064 } else { 1065 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1066 &nd.ni_cnd, &vattr); 1067 } 1068 } else { 1069 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1070 if (nd.ni_dvp == vp) 1071 vrele(nd.ni_dvp); 1072 else 1073 vput(nd.ni_dvp); 1074 if (vp) 1075 vrele(vp); 1076 } 1077 return (error); 1078 } 1079 1080 /* 1081 * Create a named pipe. 1082 */ 1083 /* ARGSUSED */ 1084 int 1085 sys_mkfifo(p, v, retval) 1086 struct proc *p; 1087 void *v; 1088 register_t *retval; 1089 { 1090 register struct sys_mkfifo_args /* { 1091 syscallarg(const char *) path; 1092 syscallarg(int) mode; 1093 } */ *uap = v; 1094 struct vattr vattr; 1095 int error; 1096 struct nameidata nd; 1097 1098 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1099 if ((error = namei(&nd)) != 0) 1100 return (error); 1101 if (nd.ni_vp != NULL) { 1102 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1103 if (nd.ni_dvp == nd.ni_vp) 1104 vrele(nd.ni_dvp); 1105 else 1106 vput(nd.ni_dvp); 1107 vrele(nd.ni_vp); 1108 return (EEXIST); 1109 } 1110 VATTR_NULL(&vattr); 1111 vattr.va_type = VFIFO; 1112 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1113 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1114 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1115 } 1116 1117 /* 1118 * Make a hard file link. 1119 */ 1120 /* ARGSUSED */ 1121 int 1122 sys_link(p, v, retval) 1123 struct proc *p; 1124 void *v; 1125 register_t *retval; 1126 { 1127 register struct sys_link_args /* { 1128 syscallarg(const char *) path; 1129 syscallarg(const char *) link; 1130 } */ *uap = v; 1131 register struct vnode *vp; 1132 struct nameidata nd; 1133 int error; 1134 1135 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1136 if ((error = namei(&nd)) != 0) 1137 return (error); 1138 vp = nd.ni_vp; 1139 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1140 if ((error = namei(&nd)) != 0) 1141 goto out; 1142 if (nd.ni_vp) { 1143 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1144 if (nd.ni_dvp == nd.ni_vp) 1145 vrele(nd.ni_dvp); 1146 else 1147 vput(nd.ni_dvp); 1148 vrele(nd.ni_vp); 1149 error = EEXIST; 1150 goto out; 1151 } 1152 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1153 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1154 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1155 out: 1156 vrele(vp); 1157 return (error); 1158 } 1159 1160 /* 1161 * Make a symbolic link. 1162 */ 1163 /* ARGSUSED */ 1164 int 1165 sys_symlink(p, v, retval) 1166 struct proc *p; 1167 void *v; 1168 register_t *retval; 1169 { 1170 register struct sys_symlink_args /* { 1171 syscallarg(const char *) path; 1172 syscallarg(const char *) link; 1173 } */ *uap = v; 1174 struct vattr vattr; 1175 char *path; 1176 int error; 1177 struct nameidata nd; 1178 1179 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1180 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1181 if (error) 1182 goto out; 1183 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1184 if ((error = namei(&nd)) != 0) 1185 goto out; 1186 if (nd.ni_vp) { 1187 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1188 if (nd.ni_dvp == nd.ni_vp) 1189 vrele(nd.ni_dvp); 1190 else 1191 vput(nd.ni_dvp); 1192 vrele(nd.ni_vp); 1193 error = EEXIST; 1194 goto out; 1195 } 1196 VATTR_NULL(&vattr); 1197 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1198 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1199 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1200 out: 1201 FREE(path, M_NAMEI); 1202 return (error); 1203 } 1204 1205 /* 1206 * Delete a whiteout from the filesystem. 1207 */ 1208 /* ARGSUSED */ 1209 int 1210 sys_undelete(p, v, retval) 1211 struct proc *p; 1212 void *v; 1213 register_t *retval; 1214 { 1215 register struct sys_undelete_args /* { 1216 syscallarg(const char *) path; 1217 } */ *uap = v; 1218 int error; 1219 struct nameidata nd; 1220 1221 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1222 SCARG(uap, path), p); 1223 error = namei(&nd); 1224 if (error) 1225 return (error); 1226 1227 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1228 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1229 if (nd.ni_dvp == nd.ni_vp) 1230 vrele(nd.ni_dvp); 1231 else 1232 vput(nd.ni_dvp); 1233 if (nd.ni_vp) 1234 vrele(nd.ni_vp); 1235 return (EEXIST); 1236 } 1237 1238 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1239 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1240 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1241 vput(nd.ni_dvp); 1242 return (error); 1243 } 1244 1245 /* 1246 * Delete a name from the filesystem. 1247 */ 1248 /* ARGSUSED */ 1249 int 1250 sys_unlink(p, v, retval) 1251 struct proc *p; 1252 void *v; 1253 register_t *retval; 1254 { 1255 struct sys_unlink_args /* { 1256 syscallarg(const char *) path; 1257 } */ *uap = v; 1258 register struct vnode *vp; 1259 int error; 1260 struct nameidata nd; 1261 1262 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1263 SCARG(uap, path), p); 1264 if ((error = namei(&nd)) != 0) 1265 return (error); 1266 vp = nd.ni_vp; 1267 1268 /* 1269 * The root of a mounted filesystem cannot be deleted. 1270 */ 1271 if (vp->v_flag & VROOT) { 1272 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1273 if (nd.ni_dvp == vp) 1274 vrele(nd.ni_dvp); 1275 else 1276 vput(nd.ni_dvp); 1277 vput(vp); 1278 error = EBUSY; 1279 goto out; 1280 } 1281 1282 (void)uvm_vnp_uncache(vp); 1283 1284 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1285 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1286 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1287 out: 1288 return (error); 1289 } 1290 1291 /* 1292 * Reposition read/write file offset. 1293 */ 1294 int 1295 sys_lseek(p, v, retval) 1296 struct proc *p; 1297 void *v; 1298 register_t *retval; 1299 { 1300 register struct sys_lseek_args /* { 1301 syscallarg(int) fd; 1302 syscallarg(int) pad; 1303 syscallarg(off_t) offset; 1304 syscallarg(int) whence; 1305 } */ *uap = v; 1306 struct ucred *cred = p->p_ucred; 1307 register struct filedesc *fdp = p->p_fd; 1308 register struct file *fp; 1309 struct vnode *vp; 1310 struct vattr vattr; 1311 register off_t newoff; 1312 int error; 1313 1314 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1315 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1316 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1317 return (EBADF); 1318 1319 FILE_USE(fp); 1320 1321 vp = (struct vnode *)fp->f_data; 1322 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1323 error = ESPIPE; 1324 goto out; 1325 } 1326 1327 switch (SCARG(uap, whence)) { 1328 case SEEK_CUR: 1329 newoff = fp->f_offset + SCARG(uap, offset); 1330 break; 1331 case SEEK_END: 1332 error = VOP_GETATTR(vp, &vattr, cred, p); 1333 if (error) 1334 goto out; 1335 newoff = SCARG(uap, offset) + vattr.va_size; 1336 break; 1337 case SEEK_SET: 1338 newoff = SCARG(uap, offset); 1339 break; 1340 default: 1341 error = EINVAL; 1342 goto out; 1343 } 1344 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1345 goto out; 1346 1347 *(off_t *)retval = fp->f_offset = newoff; 1348 out: 1349 FILE_UNUSE(fp, p); 1350 return (error); 1351 } 1352 1353 /* 1354 * Positional read system call. 1355 */ 1356 int 1357 sys_pread(p, v, retval) 1358 struct proc *p; 1359 void *v; 1360 register_t *retval; 1361 { 1362 struct sys_pread_args /* { 1363 syscallarg(int) fd; 1364 syscallarg(void *) buf; 1365 syscallarg(size_t) nbyte; 1366 syscallarg(off_t) offset; 1367 } */ *uap = v; 1368 struct filedesc *fdp = p->p_fd; 1369 struct file *fp; 1370 struct vnode *vp; 1371 off_t offset; 1372 int error, fd = SCARG(uap, fd); 1373 1374 if ((u_int)fd >= fdp->fd_nfiles || 1375 (fp = fdp->fd_ofiles[fd]) == NULL || 1376 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1377 (fp->f_flag & FREAD) == 0) 1378 return (EBADF); 1379 1380 FILE_USE(fp); 1381 1382 vp = (struct vnode *)fp->f_data; 1383 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1384 error = ESPIPE; 1385 goto out; 1386 } 1387 1388 offset = SCARG(uap, offset); 1389 1390 /* 1391 * XXX This works because no file systems actually 1392 * XXX take any action on the seek operation. 1393 */ 1394 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1395 goto out; 1396 1397 /* dofileread() will unuse the descriptor for us */ 1398 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1399 &offset, 0, retval)); 1400 1401 out: 1402 FILE_UNUSE(fp, p); 1403 return (error); 1404 } 1405 1406 /* 1407 * Positional scatter read system call. 1408 */ 1409 int 1410 sys_preadv(p, v, retval) 1411 struct proc *p; 1412 void *v; 1413 register_t *retval; 1414 { 1415 struct sys_preadv_args /* { 1416 syscallarg(int) fd; 1417 syscallarg(const struct iovec *) iovp; 1418 syscallarg(int) iovcnt; 1419 syscallarg(off_t) offset; 1420 } */ *uap = v; 1421 struct filedesc *fdp = p->p_fd; 1422 struct file *fp; 1423 struct vnode *vp; 1424 off_t offset; 1425 int error, fd = SCARG(uap, fd); 1426 1427 if ((u_int)fd >= fdp->fd_nfiles || 1428 (fp = fdp->fd_ofiles[fd]) == NULL || 1429 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1430 (fp->f_flag & FREAD) == 0) 1431 return (EBADF); 1432 1433 FILE_USE(fp); 1434 1435 vp = (struct vnode *)fp->f_data; 1436 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1437 error = ESPIPE; 1438 goto out; 1439 } 1440 1441 offset = SCARG(uap, offset); 1442 1443 /* 1444 * XXX This works because no file systems actually 1445 * XXX take any action on the seek operation. 1446 */ 1447 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1448 goto out; 1449 1450 /* dofilereadv() will unuse the descriptor for us */ 1451 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1452 &offset, 0, retval)); 1453 1454 out: 1455 FILE_UNUSE(fp, p); 1456 return (error); 1457 } 1458 1459 /* 1460 * Positional write system call. 1461 */ 1462 int 1463 sys_pwrite(p, v, retval) 1464 struct proc *p; 1465 void *v; 1466 register_t *retval; 1467 { 1468 struct sys_pwrite_args /* { 1469 syscallarg(int) fd; 1470 syscallarg(const void *) buf; 1471 syscallarg(size_t) nbyte; 1472 syscallarg(off_t) offset; 1473 } */ *uap = v; 1474 struct filedesc *fdp = p->p_fd; 1475 struct file *fp; 1476 struct vnode *vp; 1477 off_t offset; 1478 int error, fd = SCARG(uap, fd); 1479 1480 if ((u_int)fd >= fdp->fd_nfiles || 1481 (fp = fdp->fd_ofiles[fd]) == NULL || 1482 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1483 (fp->f_flag & FWRITE) == 0) 1484 return (EBADF); 1485 1486 FILE_USE(fp); 1487 1488 vp = (struct vnode *)fp->f_data; 1489 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1490 error = ESPIPE; 1491 goto out; 1492 } 1493 1494 offset = SCARG(uap, offset); 1495 1496 /* 1497 * XXX This works because no file systems actually 1498 * XXX take any action on the seek operation. 1499 */ 1500 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1501 goto out; 1502 1503 /* dofilewrite() will unuse the descriptor for us */ 1504 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1505 &offset, 0, retval)); 1506 1507 out: 1508 FILE_UNUSE(fp, p); 1509 return (error); 1510 } 1511 1512 /* 1513 * Positional gather write system call. 1514 */ 1515 int 1516 sys_pwritev(p, v, retval) 1517 struct proc *p; 1518 void *v; 1519 register_t *retval; 1520 { 1521 struct sys_pwritev_args /* { 1522 syscallarg(int) fd; 1523 syscallarg(const struct iovec *) iovp; 1524 syscallarg(int) iovcnt; 1525 syscallarg(off_t) offset; 1526 } */ *uap = v; 1527 struct filedesc *fdp = p->p_fd; 1528 struct file *fp; 1529 struct vnode *vp; 1530 off_t offset; 1531 int error, fd = SCARG(uap, fd); 1532 1533 if ((u_int)fd >= fdp->fd_nfiles || 1534 (fp = fdp->fd_ofiles[fd]) == NULL || 1535 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1536 (fp->f_flag & FWRITE) == 0) 1537 return (EBADF); 1538 1539 FILE_USE(fp); 1540 1541 vp = (struct vnode *)fp->f_data; 1542 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1543 error = ESPIPE; 1544 goto out; 1545 } 1546 1547 offset = SCARG(uap, offset); 1548 1549 /* 1550 * XXX This works because no file systems actually 1551 * XXX take any action on the seek operation. 1552 */ 1553 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1554 goto out; 1555 1556 /* dofilewritev() will unuse the descriptor for us */ 1557 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1558 &offset, 0, retval)); 1559 1560 out: 1561 FILE_UNUSE(fp, p); 1562 return (error); 1563 } 1564 1565 /* 1566 * Check access permissions. 1567 */ 1568 int 1569 sys_access(p, v, retval) 1570 struct proc *p; 1571 void *v; 1572 register_t *retval; 1573 { 1574 register struct sys_access_args /* { 1575 syscallarg(const char *) path; 1576 syscallarg(int) flags; 1577 } */ *uap = v; 1578 register struct ucred *cred = p->p_ucred; 1579 register struct vnode *vp; 1580 int error, flags, t_gid, t_uid; 1581 struct nameidata nd; 1582 1583 t_uid = cred->cr_uid; 1584 t_gid = cred->cr_gid; 1585 cred->cr_uid = p->p_cred->p_ruid; 1586 cred->cr_gid = p->p_cred->p_rgid; 1587 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1588 SCARG(uap, path), p); 1589 if ((error = namei(&nd)) != 0) 1590 goto out1; 1591 vp = nd.ni_vp; 1592 1593 /* Flags == 0 means only check for existence. */ 1594 if (SCARG(uap, flags)) { 1595 flags = 0; 1596 if (SCARG(uap, flags) & R_OK) 1597 flags |= VREAD; 1598 if (SCARG(uap, flags) & W_OK) 1599 flags |= VWRITE; 1600 if (SCARG(uap, flags) & X_OK) 1601 flags |= VEXEC; 1602 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1603 error = VOP_ACCESS(vp, flags, cred, p); 1604 } 1605 vput(vp); 1606 out1: 1607 cred->cr_uid = t_uid; 1608 cred->cr_gid = t_gid; 1609 return (error); 1610 } 1611 1612 /* 1613 * Get file status; this version follows links. 1614 */ 1615 /* ARGSUSED */ 1616 int 1617 sys___stat13(p, v, retval) 1618 struct proc *p; 1619 void *v; 1620 register_t *retval; 1621 { 1622 register struct sys___stat13_args /* { 1623 syscallarg(const char *) path; 1624 syscallarg(struct stat *) ub; 1625 } */ *uap = v; 1626 struct stat sb; 1627 int error; 1628 struct nameidata nd; 1629 1630 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1631 SCARG(uap, path), p); 1632 if ((error = namei(&nd)) != 0) 1633 return (error); 1634 error = vn_stat(nd.ni_vp, &sb, p); 1635 vput(nd.ni_vp); 1636 if (error) 1637 return (error); 1638 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1639 return (error); 1640 } 1641 1642 /* 1643 * Get file status; this version does not follow links. 1644 */ 1645 /* ARGSUSED */ 1646 int 1647 sys___lstat13(p, v, retval) 1648 struct proc *p; 1649 void *v; 1650 register_t *retval; 1651 { 1652 register struct sys___lstat13_args /* { 1653 syscallarg(const char *) path; 1654 syscallarg(struct stat *) ub; 1655 } */ *uap = v; 1656 struct stat sb; 1657 int error; 1658 struct nameidata nd; 1659 1660 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1661 SCARG(uap, path), p); 1662 if ((error = namei(&nd)) != 0) 1663 return (error); 1664 error = vn_stat(nd.ni_vp, &sb, p); 1665 vput(nd.ni_vp); 1666 if (error) 1667 return (error); 1668 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1669 return (error); 1670 } 1671 1672 /* 1673 * Get configurable pathname variables. 1674 */ 1675 /* ARGSUSED */ 1676 int 1677 sys_pathconf(p, v, retval) 1678 struct proc *p; 1679 void *v; 1680 register_t *retval; 1681 { 1682 register struct sys_pathconf_args /* { 1683 syscallarg(const char *) path; 1684 syscallarg(int) name; 1685 } */ *uap = v; 1686 int error; 1687 struct nameidata nd; 1688 1689 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1690 SCARG(uap, path), p); 1691 if ((error = namei(&nd)) != 0) 1692 return (error); 1693 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1694 vput(nd.ni_vp); 1695 return (error); 1696 } 1697 1698 /* 1699 * Return target name of a symbolic link. 1700 */ 1701 /* ARGSUSED */ 1702 int 1703 sys_readlink(p, v, retval) 1704 struct proc *p; 1705 void *v; 1706 register_t *retval; 1707 { 1708 register struct sys_readlink_args /* { 1709 syscallarg(const char *) path; 1710 syscallarg(char *) buf; 1711 syscallarg(size_t) count; 1712 } */ *uap = v; 1713 register struct vnode *vp; 1714 struct iovec aiov; 1715 struct uio auio; 1716 int error; 1717 struct nameidata nd; 1718 1719 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1720 SCARG(uap, path), p); 1721 if ((error = namei(&nd)) != 0) 1722 return (error); 1723 vp = nd.ni_vp; 1724 if (vp->v_type != VLNK) 1725 error = EINVAL; 1726 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1727 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1728 aiov.iov_base = SCARG(uap, buf); 1729 aiov.iov_len = SCARG(uap, count); 1730 auio.uio_iov = &aiov; 1731 auio.uio_iovcnt = 1; 1732 auio.uio_offset = 0; 1733 auio.uio_rw = UIO_READ; 1734 auio.uio_segflg = UIO_USERSPACE; 1735 auio.uio_procp = p; 1736 auio.uio_resid = SCARG(uap, count); 1737 error = VOP_READLINK(vp, &auio, p->p_ucred); 1738 } 1739 vput(vp); 1740 *retval = SCARG(uap, count) - auio.uio_resid; 1741 return (error); 1742 } 1743 1744 /* 1745 * Change flags of a file given a path name. 1746 */ 1747 /* ARGSUSED */ 1748 int 1749 sys_chflags(p, v, retval) 1750 struct proc *p; 1751 void *v; 1752 register_t *retval; 1753 { 1754 register struct sys_chflags_args /* { 1755 syscallarg(const char *) path; 1756 syscallarg(u_long) flags; 1757 } */ *uap = v; 1758 register struct vnode *vp; 1759 struct vattr vattr; 1760 int error; 1761 struct nameidata nd; 1762 1763 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1764 if ((error = namei(&nd)) != 0) 1765 return (error); 1766 vp = nd.ni_vp; 1767 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1768 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1769 VATTR_NULL(&vattr); 1770 vattr.va_flags = SCARG(uap, flags); 1771 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1772 vput(vp); 1773 return (error); 1774 } 1775 1776 /* 1777 * Change flags of a file given a file descriptor. 1778 */ 1779 /* ARGSUSED */ 1780 int 1781 sys_fchflags(p, v, retval) 1782 struct proc *p; 1783 void *v; 1784 register_t *retval; 1785 { 1786 register struct sys_fchflags_args /* { 1787 syscallarg(int) fd; 1788 syscallarg(u_long) flags; 1789 } */ *uap = v; 1790 struct vattr vattr; 1791 struct vnode *vp; 1792 struct file *fp; 1793 int error; 1794 1795 /* getvnode() will use the descriptor for us */ 1796 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1797 return (error); 1798 vp = (struct vnode *)fp->f_data; 1799 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1800 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1801 VATTR_NULL(&vattr); 1802 vattr.va_flags = SCARG(uap, flags); 1803 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1804 VOP_UNLOCK(vp, 0); 1805 FILE_UNUSE(fp, p); 1806 return (error); 1807 } 1808 1809 /* 1810 * Change mode of a file given path name; this version follows links. 1811 */ 1812 /* ARGSUSED */ 1813 int 1814 sys_chmod(p, v, retval) 1815 struct proc *p; 1816 void *v; 1817 register_t *retval; 1818 { 1819 register struct sys_chmod_args /* { 1820 syscallarg(const char *) path; 1821 syscallarg(int) mode; 1822 } */ *uap = v; 1823 int error; 1824 struct nameidata nd; 1825 1826 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1827 if ((error = namei(&nd)) != 0) 1828 return (error); 1829 1830 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1831 1832 vrele(nd.ni_vp); 1833 return (error); 1834 } 1835 1836 /* 1837 * Change mode of a file given a file descriptor. 1838 */ 1839 /* ARGSUSED */ 1840 int 1841 sys_fchmod(p, v, retval) 1842 struct proc *p; 1843 void *v; 1844 register_t *retval; 1845 { 1846 register struct sys_fchmod_args /* { 1847 syscallarg(int) fd; 1848 syscallarg(int) mode; 1849 } */ *uap = v; 1850 struct file *fp; 1851 int error; 1852 1853 /* getvnode() will use the descriptor for us */ 1854 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1855 return (error); 1856 1857 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 1858 FILE_UNUSE(fp, p); 1859 return (error); 1860 } 1861 1862 /* 1863 * Change mode of a file given path name; this version does not follow links. 1864 */ 1865 /* ARGSUSED */ 1866 int 1867 sys_lchmod(p, v, retval) 1868 struct proc *p; 1869 void *v; 1870 register_t *retval; 1871 { 1872 register struct sys_lchmod_args /* { 1873 syscallarg(const char *) path; 1874 syscallarg(int) mode; 1875 } */ *uap = v; 1876 int error; 1877 struct nameidata nd; 1878 1879 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1880 if ((error = namei(&nd)) != 0) 1881 return (error); 1882 1883 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1884 1885 vrele(nd.ni_vp); 1886 return (error); 1887 } 1888 1889 /* 1890 * Common routine to set mode given a vnode. 1891 */ 1892 static int 1893 change_mode(vp, mode, p) 1894 struct vnode *vp; 1895 int mode; 1896 struct proc *p; 1897 { 1898 struct vattr vattr; 1899 int error; 1900 1901 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1902 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1903 VATTR_NULL(&vattr); 1904 vattr.va_mode = mode & ALLPERMS; 1905 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1906 VOP_UNLOCK(vp, 0); 1907 return (error); 1908 } 1909 1910 /* 1911 * Set ownership given a path name; this version follows links. 1912 */ 1913 /* ARGSUSED */ 1914 int 1915 sys_chown(p, v, retval) 1916 struct proc *p; 1917 void *v; 1918 register_t *retval; 1919 { 1920 register struct sys_chown_args /* { 1921 syscallarg(const char *) path; 1922 syscallarg(uid_t) uid; 1923 syscallarg(gid_t) gid; 1924 } */ *uap = v; 1925 int error; 1926 struct nameidata nd; 1927 1928 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1929 if ((error = namei(&nd)) != 0) 1930 return (error); 1931 1932 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1933 1934 vrele(nd.ni_vp); 1935 return (error); 1936 } 1937 1938 /* 1939 * Set ownership given a path name; this version follows links. 1940 * Provides POSIX semantics. 1941 */ 1942 /* ARGSUSED */ 1943 int 1944 sys___posix_chown(p, v, retval) 1945 struct proc *p; 1946 void *v; 1947 register_t *retval; 1948 { 1949 register struct sys_chown_args /* { 1950 syscallarg(const char *) path; 1951 syscallarg(uid_t) uid; 1952 syscallarg(gid_t) gid; 1953 } */ *uap = v; 1954 int error; 1955 struct nameidata nd; 1956 1957 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1958 if ((error = namei(&nd)) != 0) 1959 return (error); 1960 1961 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 1962 1963 vrele(nd.ni_vp); 1964 return (error); 1965 } 1966 1967 /* 1968 * Set ownership given a file descriptor. 1969 */ 1970 /* ARGSUSED */ 1971 int 1972 sys_fchown(p, v, retval) 1973 struct proc *p; 1974 void *v; 1975 register_t *retval; 1976 { 1977 register struct sys_fchown_args /* { 1978 syscallarg(int) fd; 1979 syscallarg(uid_t) uid; 1980 syscallarg(gid_t) gid; 1981 } */ *uap = v; 1982 int error; 1983 struct file *fp; 1984 1985 /* getvnode() will use the descriptor for us */ 1986 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1987 return (error); 1988 1989 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1990 SCARG(uap, gid), p, 0); 1991 FILE_UNUSE(fp, p); 1992 return (error); 1993 } 1994 1995 /* 1996 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 1997 */ 1998 /* ARGSUSED */ 1999 int 2000 sys___posix_fchown(p, v, retval) 2001 struct proc *p; 2002 void *v; 2003 register_t *retval; 2004 { 2005 register struct sys_fchown_args /* { 2006 syscallarg(int) fd; 2007 syscallarg(uid_t) uid; 2008 syscallarg(gid_t) gid; 2009 } */ *uap = v; 2010 int error; 2011 struct file *fp; 2012 2013 /* getvnode() will use the descriptor for us */ 2014 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2015 return (error); 2016 2017 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2018 SCARG(uap, gid), p, 1); 2019 FILE_UNUSE(fp, p); 2020 return (error); 2021 } 2022 2023 /* 2024 * Set ownership given a path name; this version does not follow links. 2025 */ 2026 /* ARGSUSED */ 2027 int 2028 sys_lchown(p, v, retval) 2029 struct proc *p; 2030 void *v; 2031 register_t *retval; 2032 { 2033 register struct sys_lchown_args /* { 2034 syscallarg(const char *) path; 2035 syscallarg(uid_t) uid; 2036 syscallarg(gid_t) gid; 2037 } */ *uap = v; 2038 int error; 2039 struct nameidata nd; 2040 2041 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2042 if ((error = namei(&nd)) != 0) 2043 return (error); 2044 2045 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2046 2047 vrele(nd.ni_vp); 2048 return (error); 2049 } 2050 2051 /* 2052 * Set ownership given a path name; this version does not follow links. 2053 * Provides POSIX/XPG semantics. 2054 */ 2055 /* ARGSUSED */ 2056 int 2057 sys___posix_lchown(p, v, retval) 2058 struct proc *p; 2059 void *v; 2060 register_t *retval; 2061 { 2062 register struct sys_lchown_args /* { 2063 syscallarg(const char *) path; 2064 syscallarg(uid_t) uid; 2065 syscallarg(gid_t) gid; 2066 } */ *uap = v; 2067 int error; 2068 struct nameidata nd; 2069 2070 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2071 if ((error = namei(&nd)) != 0) 2072 return (error); 2073 2074 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2075 2076 vrele(nd.ni_vp); 2077 return (error); 2078 } 2079 2080 /* 2081 * Common routine to set ownership given a vnode. 2082 */ 2083 static int 2084 change_owner(vp, uid, gid, p, posix_semantics) 2085 register struct vnode *vp; 2086 uid_t uid; 2087 gid_t gid; 2088 struct proc *p; 2089 int posix_semantics; 2090 { 2091 struct vattr vattr; 2092 mode_t newmode; 2093 int error; 2094 2095 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2096 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2097 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2098 goto out; 2099 2100 #define CHANGED(x) ((x) != -1) 2101 newmode = vattr.va_mode; 2102 if (posix_semantics) { 2103 /* 2104 * POSIX/XPG semantics: if the caller is not the super-user, 2105 * clear set-user-id and set-group-id bits. Both POSIX and 2106 * the XPG consider the behaviour for calls by the super-user 2107 * implementation-defined; we leave the set-user-id and set- 2108 * group-id settings intact in that case. 2109 */ 2110 if (suser(p->p_ucred, NULL) != 0) 2111 newmode &= ~(S_ISUID | S_ISGID); 2112 } else { 2113 /* 2114 * NetBSD semantics: when changing owner and/or group, 2115 * clear the respective bit(s). 2116 */ 2117 if (CHANGED(uid)) 2118 newmode &= ~S_ISUID; 2119 if (CHANGED(gid)) 2120 newmode &= ~S_ISGID; 2121 } 2122 /* Update va_mode iff altered. */ 2123 if (vattr.va_mode == newmode) 2124 newmode = VNOVAL; 2125 2126 VATTR_NULL(&vattr); 2127 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2128 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2129 vattr.va_mode = newmode; 2130 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2131 #undef CHANGED 2132 2133 out: 2134 VOP_UNLOCK(vp, 0); 2135 return (error); 2136 } 2137 2138 /* 2139 * Set the access and modification times given a path name; this 2140 * version follows links. 2141 */ 2142 /* ARGSUSED */ 2143 int 2144 sys_utimes(p, v, retval) 2145 struct proc *p; 2146 void *v; 2147 register_t *retval; 2148 { 2149 register struct sys_utimes_args /* { 2150 syscallarg(const char *) path; 2151 syscallarg(const struct timeval *) tptr; 2152 } */ *uap = v; 2153 int error; 2154 struct nameidata nd; 2155 2156 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2157 if ((error = namei(&nd)) != 0) 2158 return (error); 2159 2160 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2161 2162 vrele(nd.ni_vp); 2163 return (error); 2164 } 2165 2166 /* 2167 * Set the access and modification times given a file descriptor. 2168 */ 2169 /* ARGSUSED */ 2170 int 2171 sys_futimes(p, v, retval) 2172 struct proc *p; 2173 void *v; 2174 register_t *retval; 2175 { 2176 register struct sys_futimes_args /* { 2177 syscallarg(int) fd; 2178 syscallarg(const struct timeval *) tptr; 2179 } */ *uap = v; 2180 int error; 2181 struct file *fp; 2182 2183 /* getvnode() will use the descriptor for us */ 2184 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2185 return (error); 2186 2187 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2188 FILE_UNUSE(fp, p); 2189 return (error); 2190 } 2191 2192 /* 2193 * Set the access and modification times given a path name; this 2194 * version does not follow links. 2195 */ 2196 /* ARGSUSED */ 2197 int 2198 sys_lutimes(p, v, retval) 2199 struct proc *p; 2200 void *v; 2201 register_t *retval; 2202 { 2203 register struct sys_lutimes_args /* { 2204 syscallarg(const char *) path; 2205 syscallarg(const struct timeval *) tptr; 2206 } */ *uap = v; 2207 int error; 2208 struct nameidata nd; 2209 2210 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2211 if ((error = namei(&nd)) != 0) 2212 return (error); 2213 2214 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2215 2216 vrele(nd.ni_vp); 2217 return (error); 2218 } 2219 2220 /* 2221 * Common routine to set access and modification times given a vnode. 2222 */ 2223 static int 2224 change_utimes(vp, tptr, p) 2225 struct vnode *vp; 2226 const struct timeval *tptr; 2227 struct proc *p; 2228 { 2229 struct timeval tv[2]; 2230 struct vattr vattr; 2231 int error; 2232 2233 VATTR_NULL(&vattr); 2234 if (tptr == NULL) { 2235 microtime(&tv[0]); 2236 tv[1] = tv[0]; 2237 vattr.va_vaflags |= VA_UTIMES_NULL; 2238 } else { 2239 error = copyin(tptr, tv, sizeof(tv)); 2240 if (error) 2241 return (error); 2242 } 2243 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2244 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2245 vattr.va_atime.tv_sec = tv[0].tv_sec; 2246 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2247 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2248 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2249 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2250 VOP_UNLOCK(vp, 0); 2251 return (error); 2252 } 2253 2254 /* 2255 * Truncate a file given its path name. 2256 */ 2257 /* ARGSUSED */ 2258 int 2259 sys_truncate(p, v, retval) 2260 struct proc *p; 2261 void *v; 2262 register_t *retval; 2263 { 2264 register struct sys_truncate_args /* { 2265 syscallarg(const char *) path; 2266 syscallarg(int) pad; 2267 syscallarg(off_t) length; 2268 } */ *uap = v; 2269 register struct vnode *vp; 2270 struct vattr vattr; 2271 int error; 2272 struct nameidata nd; 2273 2274 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2275 if ((error = namei(&nd)) != 0) 2276 return (error); 2277 vp = nd.ni_vp; 2278 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2279 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2280 if (vp->v_type == VDIR) 2281 error = EISDIR; 2282 else if ((error = vn_writechk(vp)) == 0 && 2283 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2284 VATTR_NULL(&vattr); 2285 vattr.va_size = SCARG(uap, length); 2286 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2287 } 2288 vput(vp); 2289 return (error); 2290 } 2291 2292 /* 2293 * Truncate a file given a file descriptor. 2294 */ 2295 /* ARGSUSED */ 2296 int 2297 sys_ftruncate(p, v, retval) 2298 struct proc *p; 2299 void *v; 2300 register_t *retval; 2301 { 2302 register struct sys_ftruncate_args /* { 2303 syscallarg(int) fd; 2304 syscallarg(int) pad; 2305 syscallarg(off_t) length; 2306 } */ *uap = v; 2307 struct vattr vattr; 2308 struct vnode *vp; 2309 struct file *fp; 2310 int error; 2311 2312 /* getvnode() will use the descriptor for us */ 2313 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2314 return (error); 2315 if ((fp->f_flag & FWRITE) == 0) { 2316 error = EINVAL; 2317 goto out; 2318 } 2319 vp = (struct vnode *)fp->f_data; 2320 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2321 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2322 if (vp->v_type == VDIR) 2323 error = EISDIR; 2324 else if ((error = vn_writechk(vp)) == 0) { 2325 VATTR_NULL(&vattr); 2326 vattr.va_size = SCARG(uap, length); 2327 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2328 } 2329 VOP_UNLOCK(vp, 0); 2330 out: 2331 FILE_UNUSE(fp, p); 2332 return (error); 2333 } 2334 2335 /* 2336 * Sync an open file. 2337 */ 2338 /* ARGSUSED */ 2339 int 2340 sys_fsync(p, v, retval) 2341 struct proc *p; 2342 void *v; 2343 register_t *retval; 2344 { 2345 struct sys_fsync_args /* { 2346 syscallarg(int) fd; 2347 } */ *uap = v; 2348 register struct vnode *vp; 2349 struct file *fp; 2350 int error; 2351 2352 /* getvnode() will use the descriptor for us */ 2353 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2354 return (error); 2355 vp = (struct vnode *)fp->f_data; 2356 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2357 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2358 VOP_UNLOCK(vp, 0); 2359 FILE_UNUSE(fp, p); 2360 return (error); 2361 } 2362 2363 /* 2364 * Sync the data of an open file. 2365 */ 2366 /* ARGSUSED */ 2367 int 2368 sys_fdatasync(p, v, retval) 2369 struct proc *p; 2370 void *v; 2371 register_t *retval; 2372 { 2373 struct sys_fdatasync_args /* { 2374 syscallarg(int) fd; 2375 } */ *uap = v; 2376 struct vnode *vp; 2377 struct file *fp; 2378 int error; 2379 2380 /* getvnode() will use the descriptor for us */ 2381 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2382 return (error); 2383 vp = (struct vnode *)fp->f_data; 2384 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2385 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2386 VOP_UNLOCK(vp, 0); 2387 FILE_UNUSE(fp, p); 2388 return (error); 2389 } 2390 2391 /* 2392 * Rename files, (standard) BSD semantics frontend. 2393 */ 2394 /* ARGSUSED */ 2395 int 2396 sys_rename(p, v, retval) 2397 struct proc *p; 2398 void *v; 2399 register_t *retval; 2400 { 2401 register struct sys_rename_args /* { 2402 syscallarg(const char *) from; 2403 syscallarg(const char *) to; 2404 } */ *uap = v; 2405 2406 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2407 } 2408 2409 /* 2410 * Rename files, POSIX semantics frontend. 2411 */ 2412 /* ARGSUSED */ 2413 int 2414 sys___posix_rename(p, v, retval) 2415 struct proc *p; 2416 void *v; 2417 register_t *retval; 2418 { 2419 register struct sys___posix_rename_args /* { 2420 syscallarg(const char *) from; 2421 syscallarg(const char *) to; 2422 } */ *uap = v; 2423 2424 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2425 } 2426 2427 /* 2428 * Rename files. Source and destination must either both be directories, 2429 * or both not be directories. If target is a directory, it must be empty. 2430 * If `from' and `to' refer to the same object, the value of the `retain' 2431 * argument is used to determine whether `from' will be 2432 * 2433 * (retain == 0) deleted unless `from' and `to' refer to the same 2434 * object in the file system's name space (BSD). 2435 * (retain == 1) always retained (POSIX). 2436 */ 2437 static int 2438 rename_files(from, to, p, retain) 2439 const char *from, *to; 2440 struct proc *p; 2441 int retain; 2442 { 2443 register struct vnode *tvp, *fvp, *tdvp; 2444 struct nameidata fromnd, tond; 2445 int error; 2446 2447 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2448 from, p); 2449 if ((error = namei(&fromnd)) != 0) 2450 return (error); 2451 fvp = fromnd.ni_vp; 2452 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2453 UIO_USERSPACE, to, p); 2454 if ((error = namei(&tond)) != 0) { 2455 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2456 vrele(fromnd.ni_dvp); 2457 vrele(fvp); 2458 goto out1; 2459 } 2460 tdvp = tond.ni_dvp; 2461 tvp = tond.ni_vp; 2462 2463 if (tvp != NULL) { 2464 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2465 error = ENOTDIR; 2466 goto out; 2467 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2468 error = EISDIR; 2469 goto out; 2470 } 2471 } 2472 2473 if (fvp == tdvp) 2474 error = EINVAL; 2475 2476 /* 2477 * Source and destination refer to the same object. 2478 */ 2479 if (fvp == tvp) { 2480 if (retain) 2481 error = -1; 2482 else if (fromnd.ni_dvp == tdvp && 2483 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2484 !memcmp(fromnd.ni_cnd.cn_nameptr, 2485 tond.ni_cnd.cn_nameptr, 2486 fromnd.ni_cnd.cn_namelen)) 2487 error = -1; 2488 } 2489 2490 out: 2491 if (!error) { 2492 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2493 if (fromnd.ni_dvp != tdvp) 2494 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2495 if (tvp) { 2496 (void)uvm_vnp_uncache(tvp); 2497 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2498 } 2499 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2500 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2501 } else { 2502 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2503 if (tdvp == tvp) 2504 vrele(tdvp); 2505 else 2506 vput(tdvp); 2507 if (tvp) 2508 vput(tvp); 2509 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2510 vrele(fromnd.ni_dvp); 2511 vrele(fvp); 2512 } 2513 vrele(tond.ni_startdir); 2514 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2515 out1: 2516 if (fromnd.ni_startdir) 2517 vrele(fromnd.ni_startdir); 2518 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2519 return (error == -1 ? 0 : error); 2520 } 2521 2522 /* 2523 * Make a directory file. 2524 */ 2525 /* ARGSUSED */ 2526 int 2527 sys_mkdir(p, v, retval) 2528 struct proc *p; 2529 void *v; 2530 register_t *retval; 2531 { 2532 register struct sys_mkdir_args /* { 2533 syscallarg(const char *) path; 2534 syscallarg(int) mode; 2535 } */ *uap = v; 2536 register struct vnode *vp; 2537 struct vattr vattr; 2538 int error; 2539 struct nameidata nd; 2540 2541 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2542 if ((error = namei(&nd)) != 0) 2543 return (error); 2544 vp = nd.ni_vp; 2545 if (vp != NULL) { 2546 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2547 if (nd.ni_dvp == vp) 2548 vrele(nd.ni_dvp); 2549 else 2550 vput(nd.ni_dvp); 2551 vrele(vp); 2552 return (EEXIST); 2553 } 2554 VATTR_NULL(&vattr); 2555 vattr.va_type = VDIR; 2556 vattr.va_mode = 2557 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2558 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2559 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2560 if (!error) 2561 vput(nd.ni_vp); 2562 return (error); 2563 } 2564 2565 /* 2566 * Remove a directory file. 2567 */ 2568 /* ARGSUSED */ 2569 int 2570 sys_rmdir(p, v, retval) 2571 struct proc *p; 2572 void *v; 2573 register_t *retval; 2574 { 2575 struct sys_rmdir_args /* { 2576 syscallarg(const char *) path; 2577 } */ *uap = v; 2578 register struct vnode *vp; 2579 int error; 2580 struct nameidata nd; 2581 2582 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2583 SCARG(uap, path), p); 2584 if ((error = namei(&nd)) != 0) 2585 return (error); 2586 vp = nd.ni_vp; 2587 if (vp->v_type != VDIR) { 2588 error = ENOTDIR; 2589 goto out; 2590 } 2591 /* 2592 * No rmdir "." please. 2593 */ 2594 if (nd.ni_dvp == vp) { 2595 error = EINVAL; 2596 goto out; 2597 } 2598 /* 2599 * The root of a mounted filesystem cannot be deleted. 2600 */ 2601 if (vp->v_flag & VROOT) 2602 error = EBUSY; 2603 out: 2604 if (!error) { 2605 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2606 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2607 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2608 } else { 2609 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2610 if (nd.ni_dvp == vp) 2611 vrele(nd.ni_dvp); 2612 else 2613 vput(nd.ni_dvp); 2614 vput(vp); 2615 } 2616 return (error); 2617 } 2618 2619 /* 2620 * Read a block of directory entries in a file system independent format. 2621 */ 2622 int 2623 sys_getdents(p, v, retval) 2624 struct proc *p; 2625 void *v; 2626 register_t *retval; 2627 { 2628 register struct sys_getdents_args /* { 2629 syscallarg(int) fd; 2630 syscallarg(char *) buf; 2631 syscallarg(size_t) count; 2632 } */ *uap = v; 2633 struct file *fp; 2634 int error, done; 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 if ((fp->f_flag & FREAD) == 0) { 2640 error = EBADF; 2641 goto out; 2642 } 2643 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2644 SCARG(uap, count), &done, p, 0, 0); 2645 *retval = done; 2646 out: 2647 FILE_UNUSE(fp, p); 2648 return (error); 2649 } 2650 2651 /* 2652 * Set the mode mask for creation of filesystem nodes. 2653 */ 2654 int 2655 sys_umask(p, v, retval) 2656 struct proc *p; 2657 void *v; 2658 register_t *retval; 2659 { 2660 struct sys_umask_args /* { 2661 syscallarg(mode_t) newmask; 2662 } */ *uap = v; 2663 struct cwdinfo *cwdi; 2664 2665 cwdi = p->p_cwdi; 2666 *retval = cwdi->cwdi_cmask; 2667 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2668 return (0); 2669 } 2670 2671 /* 2672 * Void all references to file by ripping underlying filesystem 2673 * away from vnode. 2674 */ 2675 /* ARGSUSED */ 2676 int 2677 sys_revoke(p, v, retval) 2678 struct proc *p; 2679 void *v; 2680 register_t *retval; 2681 { 2682 register struct sys_revoke_args /* { 2683 syscallarg(const char *) path; 2684 } */ *uap = v; 2685 register struct vnode *vp; 2686 struct vattr vattr; 2687 int error; 2688 struct nameidata nd; 2689 2690 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2691 if ((error = namei(&nd)) != 0) 2692 return (error); 2693 vp = nd.ni_vp; 2694 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2695 goto out; 2696 if (p->p_ucred->cr_uid != vattr.va_uid && 2697 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2698 goto out; 2699 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2700 VOP_REVOKE(vp, REVOKEALL); 2701 out: 2702 vrele(vp); 2703 return (error); 2704 } 2705 2706 /* 2707 * Convert a user file descriptor to a kernel file entry. 2708 */ 2709 int 2710 getvnode(fdp, fd, fpp) 2711 struct filedesc *fdp; 2712 int fd; 2713 struct file **fpp; 2714 { 2715 struct vnode *vp; 2716 struct file *fp; 2717 2718 if ((u_int)fd >= fdp->fd_nfiles || 2719 (fp = fdp->fd_ofiles[fd]) == NULL || 2720 (fp->f_iflags & FIF_WANTCLOSE) != 0) 2721 return (EBADF); 2722 2723 FILE_USE(fp); 2724 2725 if (fp->f_type != DTYPE_VNODE) { 2726 FILE_UNUSE(fp, NULL); 2727 return (EINVAL); 2728 } 2729 2730 vp = (struct vnode *)fp->f_data; 2731 if (vp->v_type == VBAD) { 2732 FILE_UNUSE(fp, NULL); 2733 return (EBADF); 2734 } 2735 2736 *fpp = fp; 2737 return (0); 2738 } 2739
Indexes created Mon Sep 22 13:09:51 GMT 2025