vfs_syscalls.c revision 1.118
1 /* $NetBSD: vfs_syscalls.c,v 1.118 1998/06/22 22:01:04 sommerfe 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_uvm.h" 44 #include "opt_fifo.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 #if defined(UVM) 66 #include <uvm/uvm_extern.h> 67 #endif 68 69 static int change_dir __P((struct nameidata *, struct proc *)); 70 static int change_mode __P((struct vnode *, int, struct proc *p)); 71 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 72 int)); 73 static int change_utimes __P((struct vnode *vp, const struct timeval *, 74 struct proc *p)); 75 static int rename_files __P((const char *, const char *, struct proc *, int)); 76 77 void checkdirs __P((struct vnode *)); 78 int dounmount __P((struct mount *, int, struct proc *)); 79 80 /* 81 * Virtual File System System Calls 82 */ 83 84 /* 85 * Mount a file system. 86 */ 87 88 #if defined(COMPAT_09) || defined(COMPAT_43) || defined(COMPAT_44) 89 /* 90 * This table is used to maintain compatibility with 4.3BSD 91 * and NetBSD 0.9 mount syscalls. Note, the order is important! 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 }; 113 const int nmountcompatnames = sizeof(mountcompatnames) / 114 sizeof(mountcompatnames[0]); 115 #endif /* COMPAT_09 || COMPAT_43 */ 116 117 /* ARGSUSED */ 118 int 119 sys_mount(p, v, retval) 120 struct proc *p; 121 void *v; 122 register_t *retval; 123 { 124 register struct sys_mount_args /* { 125 syscallarg(const char *) type; 126 syscallarg(const char *) path; 127 syscallarg(int) flags; 128 syscallarg(void *) data; 129 } */ *uap = v; 130 struct vnode *vp; 131 struct mount *mp; 132 int error, flag = 0; 133 char fstypename[MFSNAMELEN]; 134 struct vattr va; 135 struct nameidata nd; 136 struct vfsops *vfs; 137 138 /* 139 * Get vnode to be covered 140 */ 141 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 142 SCARG(uap, path), p); 143 if ((error = namei(&nd)) != 0) 144 return (error); 145 vp = nd.ni_vp; 146 /* 147 * A lookup in VFS_MOUNT might result in an attempt to 148 * lock this vnode again, so make the lock resursive. 149 */ 150 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_CANRECURSE); 151 if (SCARG(uap, flags) & MNT_UPDATE) { 152 if ((vp->v_flag & VROOT) == 0) { 153 vput(vp); 154 return (EINVAL); 155 } 156 mp = vp->v_mount; 157 flag = mp->mnt_flag; 158 vfs = mp->mnt_op; 159 /* 160 * We only allow the filesystem to be reloaded if it 161 * is currently mounted read-only. 162 */ 163 if ((SCARG(uap, flags) & MNT_RELOAD) && 164 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 165 vput(vp); 166 return (EOPNOTSUPP); /* Needs translation */ 167 } 168 mp->mnt_flag |= 169 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 170 /* 171 * Only root, or the user that did the original mount is 172 * permitted to update it. 173 */ 174 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 175 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 176 vput(vp); 177 return (error); 178 } 179 /* 180 * Do not allow NFS export by non-root users. Silently 181 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 182 */ 183 if (p->p_ucred->cr_uid != 0) { 184 if (SCARG(uap, flags) & MNT_EXPORTED) { 185 vput(vp); 186 return (EPERM); 187 } 188 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 189 } 190 if (vfs_busy(mp, LK_NOWAIT, 0)) { 191 vput(vp); 192 return (EPERM); 193 } 194 VOP_UNLOCK(vp, 0); 195 goto update; 196 } 197 /* 198 * If the user is not root, ensure that they own the directory 199 * onto which we are attempting to mount. 200 */ 201 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 202 (va.va_uid != p->p_ucred->cr_uid && 203 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 204 vput(vp); 205 return (error); 206 } 207 /* 208 * Do not allow NFS export by non-root users. Silently 209 * enforce MNT_NOSUID and MNT_NODEV for non-root users. 210 */ 211 if (p->p_ucred->cr_uid != 0) { 212 if (SCARG(uap, flags) & MNT_EXPORTED) { 213 vput(vp); 214 return (EPERM); 215 } 216 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 217 } 218 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 219 return (error); 220 if (vp->v_type != VDIR) { 221 vput(vp); 222 return (ENOTDIR); 223 } 224 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 225 if (error) { 226 #if defined(COMPAT_09) || defined(COMPAT_43) 227 /* 228 * Historically filesystem types were identified by number. 229 * If we get an integer for the filesystem type instead of a 230 * string, we check to see if it matches one of the historic 231 * filesystem types. 232 */ 233 u_long fsindex = (u_long)SCARG(uap, type); 234 if (fsindex >= nmountcompatnames || 235 mountcompatnames[fsindex] == NULL) { 236 vput(vp); 237 return (ENODEV); 238 } 239 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 240 #else 241 vput(vp); 242 return (error); 243 #endif 244 } 245 #ifdef COMPAT_10 246 /* Accept `ufs' as an alias for `ffs'. */ 247 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 248 strncpy(fstypename, "ffs", MFSNAMELEN); 249 #endif 250 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 251 vput(vp); 252 return (ENODEV); 253 } 254 if (vp->v_mountedhere != NULL) { 255 vput(vp); 256 return (EBUSY); 257 } 258 259 /* 260 * Allocate and initialize the file system. 261 */ 262 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 263 M_MOUNT, M_WAITOK); 264 bzero((char *)mp, (u_long)sizeof(struct mount)); 265 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 266 (void)vfs_busy(mp, LK_NOWAIT, 0); 267 mp->mnt_op = vfs; 268 vfs->vfs_refcount++; 269 vp->v_mountedhere = mp; 270 mp->mnt_vnodecovered = vp; 271 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 272 update: 273 /* 274 * Set the mount level flags. 275 */ 276 if (SCARG(uap, flags) & MNT_RDONLY) 277 mp->mnt_flag |= MNT_RDONLY; 278 else if (mp->mnt_flag & MNT_RDONLY) 279 mp->mnt_flag |= MNT_WANTRDWR; 280 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 281 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 282 MNT_NOATIME | MNT_SYMPERM); 283 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 284 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 285 MNT_NOCOREDUMP | MNT_NOATIME | MNT_SYMPERM); 286 /* 287 * Mount the filesystem. 288 */ 289 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 290 if (mp->mnt_flag & MNT_UPDATE) { 291 vrele(vp); 292 if (mp->mnt_flag & MNT_WANTRDWR) 293 mp->mnt_flag &= ~MNT_RDONLY; 294 mp->mnt_flag &=~ 295 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 296 if (error) 297 mp->mnt_flag = flag; 298 vfs_unbusy(mp); 299 return (error); 300 } 301 /* 302 * Put the new filesystem on the mount list after root. 303 */ 304 cache_purge(vp); 305 if (!error) { 306 simple_lock(&mountlist_slock); 307 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 308 simple_unlock(&mountlist_slock); 309 checkdirs(vp); 310 VOP_UNLOCK(vp, 0); 311 vfs_unbusy(mp); 312 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 313 if ((error = VFS_START(mp, 0, p))) 314 vrele(vp); 315 } else { 316 mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; 317 vfs->vfs_refcount--; 318 vfs_unbusy(mp); 319 free((caddr_t)mp, M_MOUNT); 320 vput(vp); 321 } 322 return (error); 323 } 324 325 /* 326 * Scan all active processes to see if any of them have a current 327 * or root directory onto which the new filesystem has just been 328 * mounted. If so, replace them with the new mount point. 329 */ 330 void 331 checkdirs(olddp) 332 struct vnode *olddp; 333 { 334 struct filedesc *fdp; 335 struct vnode *newdp; 336 struct proc *p; 337 338 if (olddp->v_usecount == 1) 339 return; 340 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 341 panic("mount: lost mount"); 342 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 343 fdp = p->p_fd; 344 if (fdp->fd_cdir == olddp) { 345 vrele(fdp->fd_cdir); 346 VREF(newdp); 347 fdp->fd_cdir = newdp; 348 } 349 if (fdp->fd_rdir == olddp) { 350 vrele(fdp->fd_rdir); 351 VREF(newdp); 352 fdp->fd_rdir = newdp; 353 } 354 } 355 if (rootvnode == olddp) { 356 vrele(rootvnode); 357 VREF(newdp); 358 rootvnode = newdp; 359 } 360 vput(newdp); 361 } 362 363 /* 364 * Unmount a file system. 365 * 366 * Note: unmount takes a path to the vnode mounted on as argument, 367 * not special file (as before). 368 */ 369 /* ARGSUSED */ 370 int 371 sys_unmount(p, v, retval) 372 struct proc *p; 373 void *v; 374 register_t *retval; 375 { 376 register struct sys_unmount_args /* { 377 syscallarg(const char *) path; 378 syscallarg(int) flags; 379 } */ *uap = v; 380 register struct vnode *vp; 381 struct mount *mp; 382 int error; 383 struct nameidata nd; 384 385 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 386 SCARG(uap, path), p); 387 if ((error = namei(&nd)) != 0) 388 return (error); 389 vp = nd.ni_vp; 390 mp = vp->v_mount; 391 392 /* 393 * Only root, or the user that did the original mount is 394 * permitted to unmount this filesystem. 395 */ 396 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 397 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 398 vput(vp); 399 return (error); 400 } 401 402 /* 403 * Don't allow unmounting the root file system. 404 */ 405 if (mp->mnt_flag & MNT_ROOTFS) { 406 vput(vp); 407 return (EINVAL); 408 } 409 410 /* 411 * Must be the root of the filesystem 412 */ 413 if ((vp->v_flag & VROOT) == 0) { 414 vput(vp); 415 return (EINVAL); 416 } 417 vput(vp); 418 419 if (vfs_busy(mp, 0, 0)) 420 return (EBUSY); 421 422 return (dounmount(mp, SCARG(uap, flags), p)); 423 } 424 425 /* 426 * Do the actual file system unmount. File system is assumed to have been 427 * marked busy by the caller. 428 */ 429 int 430 dounmount(mp, flags, p) 431 register struct mount *mp; 432 int flags; 433 struct proc *p; 434 { 435 struct vnode *coveredvp; 436 int error; 437 438 simple_lock(&mountlist_slock); 439 mp->mnt_flag |= MNT_UNMOUNT; 440 vfs_unbusy(mp); 441 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 442 if (mp->mnt_flag & MNT_EXPUBLIC) 443 vfs_setpublicfs(NULL, NULL, NULL); 444 mp->mnt_flag &=~ MNT_ASYNC; 445 #if !defined(UVM) 446 vnode_pager_umount(mp); /* release cached vnodes */ 447 #endif 448 cache_purgevfs(mp); /* remove cache entries for this file sys */ 449 if (((mp->mnt_flag & MNT_RDONLY) || 450 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 451 (flags & MNT_FORCE)) 452 error = VFS_UNMOUNT(mp, flags, p); 453 simple_lock(&mountlist_slock); 454 if (error) { 455 mp->mnt_flag &= ~MNT_UNMOUNT; 456 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 457 &mountlist_slock); 458 if (mp->mnt_flag & MNT_MWAIT) 459 wakeup((caddr_t)mp); 460 return (error); 461 } 462 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 463 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 464 coveredvp->v_mountedhere = NULL; 465 vrele(coveredvp); 466 } 467 mp->mnt_op->vfs_refcount--; 468 if (mp->mnt_vnodelist.lh_first != NULL) 469 panic("unmount: dangling vnode"); 470 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 471 if (mp->mnt_flag & MNT_MWAIT) 472 wakeup((caddr_t)mp); 473 free((caddr_t)mp, M_MOUNT); 474 return (0); 475 } 476 477 /* 478 * Sync each mounted filesystem. 479 */ 480 #ifdef DEBUG 481 int syncprt = 0; 482 struct ctldebug debug0 = { "syncprt", &syncprt }; 483 #endif 484 485 /* ARGSUSED */ 486 int 487 sys_sync(p, v, retval) 488 struct proc *p; 489 void *v; 490 register_t *retval; 491 { 492 register struct mount *mp, *nmp; 493 int asyncflag; 494 495 simple_lock(&mountlist_slock); 496 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 497 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 498 nmp = mp->mnt_list.cqe_prev; 499 continue; 500 } 501 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 502 asyncflag = mp->mnt_flag & MNT_ASYNC; 503 mp->mnt_flag &= ~MNT_ASYNC; 504 #if defined(UVM) 505 uvm_vnp_sync(mp); 506 #else 507 vnode_pager_sync(mp); 508 #endif 509 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 510 if (asyncflag) 511 mp->mnt_flag |= MNT_ASYNC; 512 } 513 simple_lock(&mountlist_slock); 514 nmp = mp->mnt_list.cqe_prev; 515 vfs_unbusy(mp); 516 517 } 518 simple_unlock(&mountlist_slock); 519 #ifdef DEBUG 520 if (syncprt) 521 vfs_bufstats(); 522 #endif /* DEBUG */ 523 return (0); 524 } 525 526 /* 527 * Change filesystem quotas. 528 */ 529 /* ARGSUSED */ 530 int 531 sys_quotactl(p, v, retval) 532 struct proc *p; 533 void *v; 534 register_t *retval; 535 { 536 register struct sys_quotactl_args /* { 537 syscallarg(const char *) path; 538 syscallarg(int) cmd; 539 syscallarg(int) uid; 540 syscallarg(caddr_t) arg; 541 } */ *uap = v; 542 register struct mount *mp; 543 int error; 544 struct nameidata nd; 545 546 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 547 if ((error = namei(&nd)) != 0) 548 return (error); 549 mp = nd.ni_vp->v_mount; 550 vrele(nd.ni_vp); 551 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 552 SCARG(uap, arg), p)); 553 } 554 555 /* 556 * Get filesystem statistics. 557 */ 558 /* ARGSUSED */ 559 int 560 sys_statfs(p, v, retval) 561 struct proc *p; 562 void *v; 563 register_t *retval; 564 { 565 register struct sys_statfs_args /* { 566 syscallarg(const char *) path; 567 syscallarg(struct statfs *) buf; 568 } */ *uap = v; 569 register struct mount *mp; 570 register struct statfs *sp; 571 int error; 572 struct nameidata nd; 573 574 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 575 if ((error = namei(&nd)) != 0) 576 return (error); 577 mp = nd.ni_vp->v_mount; 578 sp = &mp->mnt_stat; 579 vrele(nd.ni_vp); 580 if ((error = VFS_STATFS(mp, sp, p)) != 0) 581 return (error); 582 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 583 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 584 } 585 586 /* 587 * Get filesystem statistics. 588 */ 589 /* ARGSUSED */ 590 int 591 sys_fstatfs(p, v, retval) 592 struct proc *p; 593 void *v; 594 register_t *retval; 595 { 596 register struct sys_fstatfs_args /* { 597 syscallarg(int) fd; 598 syscallarg(struct statfs *) buf; 599 } */ *uap = v; 600 struct file *fp; 601 struct mount *mp; 602 register struct statfs *sp; 603 int error; 604 605 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 606 return (error); 607 mp = ((struct vnode *)fp->f_data)->v_mount; 608 sp = &mp->mnt_stat; 609 if ((error = VFS_STATFS(mp, sp, p)) != 0) 610 return (error); 611 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 612 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 613 } 614 615 /* 616 * Get statistics on all filesystems. 617 */ 618 int 619 sys_getfsstat(p, v, retval) 620 struct proc *p; 621 void *v; 622 register_t *retval; 623 { 624 register struct sys_getfsstat_args /* { 625 syscallarg(struct statfs *) buf; 626 syscallarg(long) bufsize; 627 syscallarg(int) flags; 628 } */ *uap = v; 629 register struct mount *mp, *nmp; 630 register struct statfs *sp; 631 caddr_t sfsp; 632 long count, maxcount, error; 633 634 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 635 sfsp = (caddr_t)SCARG(uap, buf); 636 simple_lock(&mountlist_slock); 637 count = 0; 638 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 639 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 640 nmp = mp->mnt_list.cqe_next; 641 continue; 642 } 643 if (sfsp && count < maxcount) { 644 sp = &mp->mnt_stat; 645 /* 646 * If MNT_NOWAIT is specified, do not refresh the 647 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 648 */ 649 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 650 (SCARG(uap, flags) & MNT_WAIT)) && 651 (error = VFS_STATFS(mp, sp, p)) != 0) { 652 simple_lock(&mountlist_slock); 653 nmp = mp->mnt_list.cqe_next; 654 vfs_unbusy(mp); 655 continue; 656 } 657 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 658 error = copyout(sp, sfsp, sizeof(*sp)); 659 if (error) 660 return (error); 661 sfsp += sizeof(*sp); 662 } 663 count++; 664 simple_lock(&mountlist_slock); 665 nmp = mp->mnt_list.cqe_next; 666 vfs_unbusy(mp); 667 } 668 simple_unlock(&mountlist_slock); 669 if (sfsp && count > maxcount) 670 *retval = maxcount; 671 else 672 *retval = count; 673 return (0); 674 } 675 676 /* 677 * Change current working directory to a given file descriptor. 678 */ 679 /* ARGSUSED */ 680 int 681 sys_fchdir(p, v, retval) 682 struct proc *p; 683 void *v; 684 register_t *retval; 685 { 686 struct sys_fchdir_args /* { 687 syscallarg(int) fd; 688 } */ *uap = v; 689 register struct filedesc *fdp = p->p_fd; 690 struct vnode *vp, *tdp; 691 struct mount *mp; 692 struct file *fp; 693 int error; 694 695 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 696 return (error); 697 vp = (struct vnode *)fp->f_data; 698 VREF(vp); 699 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 700 if (vp->v_type != VDIR) 701 error = ENOTDIR; 702 else 703 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 704 while (!error && (mp = vp->v_mountedhere) != NULL) { 705 if (vfs_busy(mp, 0, 0)) 706 continue; 707 error = VFS_ROOT(mp, &tdp); 708 vfs_unbusy(mp); 709 if (error) 710 break; 711 vput(vp); 712 vp = tdp; 713 } 714 if (error) { 715 vput(vp); 716 return (error); 717 } 718 VOP_UNLOCK(vp, 0); 719 vrele(fdp->fd_cdir); 720 fdp->fd_cdir = vp; 721 return (0); 722 } 723 724 /* 725 * Change current working directory (``.''). 726 */ 727 /* ARGSUSED */ 728 int 729 sys_chdir(p, v, retval) 730 struct proc *p; 731 void *v; 732 register_t *retval; 733 { 734 struct sys_chdir_args /* { 735 syscallarg(const char *) path; 736 } */ *uap = v; 737 register struct filedesc *fdp = p->p_fd; 738 int error; 739 struct nameidata nd; 740 741 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 742 SCARG(uap, path), p); 743 if ((error = change_dir(&nd, p)) != 0) 744 return (error); 745 vrele(fdp->fd_cdir); 746 fdp->fd_cdir = nd.ni_vp; 747 return (0); 748 } 749 750 /* 751 * Change notion of root (``/'') directory. 752 */ 753 /* ARGSUSED */ 754 int 755 sys_chroot(p, v, retval) 756 struct proc *p; 757 void *v; 758 register_t *retval; 759 { 760 struct sys_chroot_args /* { 761 syscallarg(const char *) path; 762 } */ *uap = v; 763 register struct filedesc *fdp = p->p_fd; 764 int error; 765 struct nameidata nd; 766 767 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 768 return (error); 769 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 770 SCARG(uap, path), p); 771 if ((error = change_dir(&nd, p)) != 0) 772 return (error); 773 if (fdp->fd_rdir != NULL) 774 vrele(fdp->fd_rdir); 775 fdp->fd_rdir = nd.ni_vp; 776 return (0); 777 } 778 779 /* 780 * Common routine for chroot and chdir. 781 */ 782 static int 783 change_dir(ndp, p) 784 register struct nameidata *ndp; 785 struct proc *p; 786 { 787 struct vnode *vp; 788 int error; 789 790 if ((error = namei(ndp)) != 0) 791 return (error); 792 vp = ndp->ni_vp; 793 if (vp->v_type != VDIR) 794 error = ENOTDIR; 795 else 796 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 797 798 if (error) 799 vput(vp); 800 else 801 VOP_UNLOCK(vp, 0); 802 return (error); 803 } 804 805 /* 806 * Check permissions, allocate an open file structure, 807 * and call the device open routine if any. 808 */ 809 int 810 sys_open(p, v, retval) 811 struct proc *p; 812 void *v; 813 register_t *retval; 814 { 815 register struct sys_open_args /* { 816 syscallarg(const char *) path; 817 syscallarg(int) flags; 818 syscallarg(int) mode; 819 } */ *uap = v; 820 register struct filedesc *fdp = p->p_fd; 821 register struct file *fp; 822 register struct vnode *vp; 823 int flags, cmode; 824 struct file *nfp; 825 int type, indx, error; 826 struct flock lf; 827 struct nameidata nd; 828 extern struct fileops vnops; 829 830 flags = FFLAGS(SCARG(uap, flags)); 831 if ((flags & (FREAD | FWRITE)) == 0) 832 return (EINVAL); 833 if ((error = falloc(p, &nfp, &indx)) != 0) 834 return (error); 835 fp = nfp; 836 cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; 837 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 838 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 839 if ((error = vn_open(&nd, flags, cmode)) != 0) { 840 ffree(fp); 841 if ((error == ENODEV || error == ENXIO) && 842 p->p_dupfd >= 0 && /* XXX from fdopen */ 843 (error = 844 dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { 845 *retval = indx; 846 return (0); 847 } 848 if (error == ERESTART) 849 error = EINTR; 850 fdp->fd_ofiles[indx] = NULL; 851 return (error); 852 } 853 p->p_dupfd = 0; 854 vp = nd.ni_vp; 855 fp->f_flag = flags & FMASK; 856 fp->f_type = DTYPE_VNODE; 857 fp->f_ops = &vnops; 858 fp->f_data = (caddr_t)vp; 859 if (flags & (O_EXLOCK | O_SHLOCK)) { 860 lf.l_whence = SEEK_SET; 861 lf.l_start = 0; 862 lf.l_len = 0; 863 if (flags & O_EXLOCK) 864 lf.l_type = F_WRLCK; 865 else 866 lf.l_type = F_RDLCK; 867 type = F_FLOCK; 868 if ((flags & FNONBLOCK) == 0) 869 type |= F_WAIT; 870 VOP_UNLOCK(vp, 0); 871 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 872 if (error) { 873 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 874 ffree(fp); 875 fdp->fd_ofiles[indx] = NULL; 876 return (error); 877 } 878 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 879 fp->f_flag |= FHASLOCK; 880 } 881 VOP_UNLOCK(vp, 0); 882 *retval = indx; 883 return (0); 884 } 885 886 /* 887 * Create a special file. 888 */ 889 /* ARGSUSED */ 890 int 891 sys_mknod(p, v, retval) 892 struct proc *p; 893 void *v; 894 register_t *retval; 895 { 896 register struct sys_mknod_args /* { 897 syscallarg(const char *) path; 898 syscallarg(int) mode; 899 syscallarg(int) dev; 900 } */ *uap = v; 901 register struct vnode *vp; 902 struct vattr vattr; 903 int error; 904 int whiteout = 0; 905 struct nameidata nd; 906 907 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 908 return (error); 909 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 910 if ((error = namei(&nd)) != 0) 911 return (error); 912 vp = nd.ni_vp; 913 if (vp != NULL) 914 error = EEXIST; 915 else { 916 VATTR_NULL(&vattr); 917 vattr.va_mode = 918 (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 919 vattr.va_rdev = SCARG(uap, dev); 920 whiteout = 0; 921 922 switch (SCARG(uap, mode) & S_IFMT) { 923 case S_IFMT: /* used by badsect to flag bad sectors */ 924 vattr.va_type = VBAD; 925 break; 926 case S_IFCHR: 927 vattr.va_type = VCHR; 928 break; 929 case S_IFBLK: 930 vattr.va_type = VBLK; 931 break; 932 case S_IFWHT: 933 whiteout = 1; 934 break; 935 default: 936 error = EINVAL; 937 break; 938 } 939 } 940 if (!error) { 941 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 942 if (whiteout) { 943 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 944 if (error) 945 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 946 vput(nd.ni_dvp); 947 } else { 948 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 949 &nd.ni_cnd, &vattr); 950 } 951 } else { 952 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 953 if (nd.ni_dvp == vp) 954 vrele(nd.ni_dvp); 955 else 956 vput(nd.ni_dvp); 957 if (vp) 958 vrele(vp); 959 } 960 return (error); 961 } 962 963 /* 964 * Create a named pipe. 965 */ 966 /* ARGSUSED */ 967 int 968 sys_mkfifo(p, v, retval) 969 struct proc *p; 970 void *v; 971 register_t *retval; 972 { 973 #ifndef FIFO 974 return (EOPNOTSUPP); 975 #else 976 register struct sys_mkfifo_args /* { 977 syscallarg(const char *) path; 978 syscallarg(int) mode; 979 } */ *uap = v; 980 struct vattr vattr; 981 int error; 982 struct nameidata nd; 983 984 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 985 if ((error = namei(&nd)) != 0) 986 return (error); 987 if (nd.ni_vp != NULL) { 988 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 989 if (nd.ni_dvp == nd.ni_vp) 990 vrele(nd.ni_dvp); 991 else 992 vput(nd.ni_dvp); 993 vrele(nd.ni_vp); 994 return (EEXIST); 995 } 996 VATTR_NULL(&vattr); 997 vattr.va_type = VFIFO; 998 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; 999 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1000 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1001 #endif /* FIFO */ 1002 } 1003 1004 /* 1005 * Make a hard file link. 1006 */ 1007 /* ARGSUSED */ 1008 int 1009 sys_link(p, v, retval) 1010 struct proc *p; 1011 void *v; 1012 register_t *retval; 1013 { 1014 register struct sys_link_args /* { 1015 syscallarg(const char *) path; 1016 syscallarg(const char *) link; 1017 } */ *uap = v; 1018 register struct vnode *vp; 1019 struct nameidata nd; 1020 int error; 1021 1022 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1023 if ((error = namei(&nd)) != 0) 1024 return (error); 1025 vp = nd.ni_vp; 1026 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1027 if ((error = namei(&nd)) != 0) 1028 goto out; 1029 if (nd.ni_vp) { 1030 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1031 if (nd.ni_dvp == nd.ni_vp) 1032 vrele(nd.ni_dvp); 1033 else 1034 vput(nd.ni_dvp); 1035 vrele(nd.ni_vp); 1036 error = EEXIST; 1037 goto out; 1038 } 1039 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1040 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1041 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1042 out: 1043 vrele(vp); 1044 return (error); 1045 } 1046 1047 /* 1048 * Make a symbolic link. 1049 */ 1050 /* ARGSUSED */ 1051 int 1052 sys_symlink(p, v, retval) 1053 struct proc *p; 1054 void *v; 1055 register_t *retval; 1056 { 1057 register struct sys_symlink_args /* { 1058 syscallarg(const char *) path; 1059 syscallarg(const char *) link; 1060 } */ *uap = v; 1061 struct vattr vattr; 1062 char *path; 1063 int error; 1064 struct nameidata nd; 1065 1066 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1067 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1068 if (error) 1069 goto out; 1070 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1071 if ((error = namei(&nd)) != 0) 1072 goto out; 1073 if (nd.ni_vp) { 1074 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1075 if (nd.ni_dvp == nd.ni_vp) 1076 vrele(nd.ni_dvp); 1077 else 1078 vput(nd.ni_dvp); 1079 vrele(nd.ni_vp); 1080 error = EEXIST; 1081 goto out; 1082 } 1083 VATTR_NULL(&vattr); 1084 vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; 1085 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1086 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1087 out: 1088 FREE(path, M_NAMEI); 1089 return (error); 1090 } 1091 1092 /* 1093 * Delete a whiteout from the filesystem. 1094 */ 1095 /* ARGSUSED */ 1096 int 1097 sys_undelete(p, v, retval) 1098 struct proc *p; 1099 void *v; 1100 register_t *retval; 1101 { 1102 register struct sys_undelete_args /* { 1103 syscallarg(const char *) path; 1104 } */ *uap = v; 1105 int error; 1106 struct nameidata nd; 1107 1108 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1109 SCARG(uap, path), p); 1110 error = namei(&nd); 1111 if (error) 1112 return (error); 1113 1114 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1115 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1116 if (nd.ni_dvp == nd.ni_vp) 1117 vrele(nd.ni_dvp); 1118 else 1119 vput(nd.ni_dvp); 1120 if (nd.ni_vp) 1121 vrele(nd.ni_vp); 1122 return (EEXIST); 1123 } 1124 1125 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1126 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1127 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1128 vput(nd.ni_dvp); 1129 return (error); 1130 } 1131 1132 /* 1133 * Delete a name from the filesystem. 1134 */ 1135 /* ARGSUSED */ 1136 int 1137 sys_unlink(p, v, retval) 1138 struct proc *p; 1139 void *v; 1140 register_t *retval; 1141 { 1142 struct sys_unlink_args /* { 1143 syscallarg(const char *) path; 1144 } */ *uap = v; 1145 register struct vnode *vp; 1146 int error; 1147 struct nameidata nd; 1148 1149 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1150 SCARG(uap, path), p); 1151 if ((error = namei(&nd)) != 0) 1152 return (error); 1153 vp = nd.ni_vp; 1154 1155 /* 1156 * The root of a mounted filesystem cannot be deleted. 1157 */ 1158 if (vp->v_flag & VROOT) { 1159 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1160 if (nd.ni_dvp == vp) 1161 vrele(nd.ni_dvp); 1162 else 1163 vput(nd.ni_dvp); 1164 vput(vp); 1165 error = EBUSY; 1166 goto out; 1167 } 1168 1169 #if defined(UVM) 1170 (void)uvm_vnp_uncache(vp); 1171 #else 1172 (void)vnode_pager_uncache(vp); 1173 #endif 1174 1175 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1176 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1177 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1178 out: 1179 return (error); 1180 } 1181 1182 /* 1183 * Reposition read/write file offset. 1184 */ 1185 int 1186 sys_lseek(p, v, retval) 1187 struct proc *p; 1188 void *v; 1189 register_t *retval; 1190 { 1191 register struct sys_lseek_args /* { 1192 syscallarg(int) fd; 1193 syscallarg(int) pad; 1194 syscallarg(off_t) offset; 1195 syscallarg(int) whence; 1196 } */ *uap = v; 1197 struct ucred *cred = p->p_ucred; 1198 register struct filedesc *fdp = p->p_fd; 1199 register struct file *fp; 1200 struct vnode *vp; 1201 struct vattr vattr; 1202 register off_t newoff; 1203 int error; 1204 1205 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1206 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 1207 return (EBADF); 1208 1209 vp = (struct vnode *)fp->f_data; 1210 if (fp->f_type != DTYPE_VNODE 1211 #ifdef FIFO 1212 || vp->v_type == VFIFO 1213 #endif 1214 ) 1215 return (ESPIPE); 1216 1217 switch (SCARG(uap, whence)) { 1218 case SEEK_CUR: 1219 newoff = fp->f_offset + SCARG(uap, offset); 1220 break; 1221 case SEEK_END: 1222 error = VOP_GETATTR(vp, &vattr, cred, p); 1223 if (error) 1224 return (error); 1225 newoff = SCARG(uap, offset) + vattr.va_size; 1226 break; 1227 case SEEK_SET: 1228 newoff = SCARG(uap, offset); 1229 break; 1230 default: 1231 return (EINVAL); 1232 } 1233 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1234 return (error); 1235 1236 *(off_t *)retval = fp->f_offset = newoff; 1237 return (0); 1238 } 1239 1240 /* 1241 * Check access permissions. 1242 */ 1243 int 1244 sys_access(p, v, retval) 1245 struct proc *p; 1246 void *v; 1247 register_t *retval; 1248 { 1249 register struct sys_access_args /* { 1250 syscallarg(const char *) path; 1251 syscallarg(int) flags; 1252 } */ *uap = v; 1253 register struct ucred *cred = p->p_ucred; 1254 register struct vnode *vp; 1255 int error, flags, t_gid, t_uid; 1256 struct nameidata nd; 1257 1258 t_uid = cred->cr_uid; 1259 t_gid = cred->cr_gid; 1260 cred->cr_uid = p->p_cred->p_ruid; 1261 cred->cr_gid = p->p_cred->p_rgid; 1262 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1263 SCARG(uap, path), p); 1264 if ((error = namei(&nd)) != 0) 1265 goto out1; 1266 vp = nd.ni_vp; 1267 1268 /* Flags == 0 means only check for existence. */ 1269 if (SCARG(uap, flags)) { 1270 flags = 0; 1271 if (SCARG(uap, flags) & R_OK) 1272 flags |= VREAD; 1273 if (SCARG(uap, flags) & W_OK) 1274 flags |= VWRITE; 1275 if (SCARG(uap, flags) & X_OK) 1276 flags |= VEXEC; 1277 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1278 error = VOP_ACCESS(vp, flags, cred, p); 1279 } 1280 vput(vp); 1281 out1: 1282 cred->cr_uid = t_uid; 1283 cred->cr_gid = t_gid; 1284 return (error); 1285 } 1286 1287 /* 1288 * Get file status; this version follows links. 1289 */ 1290 /* ARGSUSED */ 1291 int 1292 sys___stat13(p, v, retval) 1293 struct proc *p; 1294 void *v; 1295 register_t *retval; 1296 { 1297 register struct sys___stat13_args /* { 1298 syscallarg(const char *) path; 1299 syscallarg(struct stat *) ub; 1300 } */ *uap = v; 1301 struct stat sb; 1302 int error; 1303 struct nameidata nd; 1304 1305 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1306 SCARG(uap, path), p); 1307 if ((error = namei(&nd)) != 0) 1308 return (error); 1309 error = vn_stat(nd.ni_vp, &sb, p); 1310 vput(nd.ni_vp); 1311 if (error) 1312 return (error); 1313 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1314 return (error); 1315 } 1316 1317 /* 1318 * Get file status; this version does not follow links. 1319 */ 1320 /* ARGSUSED */ 1321 int 1322 sys___lstat13(p, v, retval) 1323 struct proc *p; 1324 void *v; 1325 register_t *retval; 1326 { 1327 register struct sys___lstat13_args /* { 1328 syscallarg(const char *) path; 1329 syscallarg(struct stat *) ub; 1330 } */ *uap = v; 1331 struct stat sb; 1332 int error; 1333 struct nameidata nd; 1334 1335 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1336 SCARG(uap, path), p); 1337 if ((error = namei(&nd)) != 0) 1338 return (error); 1339 error = vn_stat(nd.ni_vp, &sb, p); 1340 vput(nd.ni_vp); 1341 if (error) 1342 return (error); 1343 error = copyout(&sb, SCARG(uap, ub), sizeof (sb)); 1344 return (error); 1345 } 1346 1347 /* 1348 * Get configurable pathname variables. 1349 */ 1350 /* ARGSUSED */ 1351 int 1352 sys_pathconf(p, v, retval) 1353 struct proc *p; 1354 void *v; 1355 register_t *retval; 1356 { 1357 register struct sys_pathconf_args /* { 1358 syscallarg(const char *) path; 1359 syscallarg(int) name; 1360 } */ *uap = v; 1361 int error; 1362 struct nameidata nd; 1363 1364 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1365 SCARG(uap, path), p); 1366 if ((error = namei(&nd)) != 0) 1367 return (error); 1368 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1369 vput(nd.ni_vp); 1370 return (error); 1371 } 1372 1373 /* 1374 * Return target name of a symbolic link. 1375 */ 1376 /* ARGSUSED */ 1377 int 1378 sys_readlink(p, v, retval) 1379 struct proc *p; 1380 void *v; 1381 register_t *retval; 1382 { 1383 register struct sys_readlink_args /* { 1384 syscallarg(const char *) path; 1385 syscallarg(char *) buf; 1386 syscallarg(size_t) count; 1387 } */ *uap = v; 1388 register struct vnode *vp; 1389 struct iovec aiov; 1390 struct uio auio; 1391 int error; 1392 struct nameidata nd; 1393 1394 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1395 SCARG(uap, path), p); 1396 if ((error = namei(&nd)) != 0) 1397 return (error); 1398 vp = nd.ni_vp; 1399 if (vp->v_type != VLNK) 1400 error = EINVAL; 1401 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1402 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1403 aiov.iov_base = SCARG(uap, buf); 1404 aiov.iov_len = SCARG(uap, count); 1405 auio.uio_iov = &aiov; 1406 auio.uio_iovcnt = 1; 1407 auio.uio_offset = 0; 1408 auio.uio_rw = UIO_READ; 1409 auio.uio_segflg = UIO_USERSPACE; 1410 auio.uio_procp = p; 1411 auio.uio_resid = SCARG(uap, count); 1412 error = VOP_READLINK(vp, &auio, p->p_ucred); 1413 } 1414 vput(vp); 1415 *retval = SCARG(uap, count) - auio.uio_resid; 1416 return (error); 1417 } 1418 1419 /* 1420 * Change flags of a file given a path name. 1421 */ 1422 /* ARGSUSED */ 1423 int 1424 sys_chflags(p, v, retval) 1425 struct proc *p; 1426 void *v; 1427 register_t *retval; 1428 { 1429 register struct sys_chflags_args /* { 1430 syscallarg(const char *) path; 1431 syscallarg(u_long) flags; 1432 } */ *uap = v; 1433 register struct vnode *vp; 1434 struct vattr vattr; 1435 int error; 1436 struct nameidata nd; 1437 1438 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1439 if ((error = namei(&nd)) != 0) 1440 return (error); 1441 vp = nd.ni_vp; 1442 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1443 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1444 VATTR_NULL(&vattr); 1445 vattr.va_flags = SCARG(uap, flags); 1446 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1447 vput(vp); 1448 return (error); 1449 } 1450 1451 /* 1452 * Change flags of a file given a file descriptor. 1453 */ 1454 /* ARGSUSED */ 1455 int 1456 sys_fchflags(p, v, retval) 1457 struct proc *p; 1458 void *v; 1459 register_t *retval; 1460 { 1461 register struct sys_fchflags_args /* { 1462 syscallarg(int) fd; 1463 syscallarg(u_long) flags; 1464 } */ *uap = v; 1465 struct vattr vattr; 1466 struct vnode *vp; 1467 struct file *fp; 1468 int error; 1469 1470 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1471 return (error); 1472 vp = (struct vnode *)fp->f_data; 1473 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1474 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1475 VATTR_NULL(&vattr); 1476 vattr.va_flags = SCARG(uap, flags); 1477 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1478 VOP_UNLOCK(vp, 0); 1479 return (error); 1480 } 1481 1482 /* 1483 * Change mode of a file given path name; this version follows links. 1484 */ 1485 /* ARGSUSED */ 1486 int 1487 sys_chmod(p, v, retval) 1488 struct proc *p; 1489 void *v; 1490 register_t *retval; 1491 { 1492 register struct sys_chmod_args /* { 1493 syscallarg(const char *) path; 1494 syscallarg(int) mode; 1495 } */ *uap = v; 1496 int error; 1497 struct nameidata nd; 1498 1499 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1500 if ((error = namei(&nd)) != 0) 1501 return (error); 1502 1503 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1504 1505 vrele(nd.ni_vp); 1506 return (error); 1507 } 1508 1509 /* 1510 * Change mode of a file given a file descriptor. 1511 */ 1512 /* ARGSUSED */ 1513 int 1514 sys_fchmod(p, v, retval) 1515 struct proc *p; 1516 void *v; 1517 register_t *retval; 1518 { 1519 register struct sys_fchmod_args /* { 1520 syscallarg(int) fd; 1521 syscallarg(int) mode; 1522 } */ *uap = v; 1523 struct file *fp; 1524 int error; 1525 1526 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1527 return (error); 1528 1529 return (change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p)); 1530 } 1531 1532 /* 1533 * Change mode of a file given path name; this version does not follow links. 1534 */ 1535 /* ARGSUSED */ 1536 int 1537 sys_lchmod(p, v, retval) 1538 struct proc *p; 1539 void *v; 1540 register_t *retval; 1541 { 1542 register struct sys_lchmod_args /* { 1543 syscallarg(const char *) path; 1544 syscallarg(int) mode; 1545 } */ *uap = v; 1546 int error; 1547 struct nameidata nd; 1548 1549 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1550 if ((error = namei(&nd)) != 0) 1551 return (error); 1552 1553 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 1554 1555 vrele(nd.ni_vp); 1556 return (error); 1557 } 1558 1559 /* 1560 * Common routine to set mode given a vnode. 1561 */ 1562 static int 1563 change_mode(vp, mode, p) 1564 struct vnode *vp; 1565 int mode; 1566 struct proc *p; 1567 { 1568 struct vattr vattr; 1569 int error; 1570 1571 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1572 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1573 VATTR_NULL(&vattr); 1574 vattr.va_mode = mode & ALLPERMS; 1575 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1576 VOP_UNLOCK(vp, 0); 1577 return (error); 1578 } 1579 1580 /* 1581 * Set ownership given a path name; this version follows links. 1582 */ 1583 /* ARGSUSED */ 1584 int 1585 sys_chown(p, v, retval) 1586 struct proc *p; 1587 void *v; 1588 register_t *retval; 1589 { 1590 register struct sys_chown_args /* { 1591 syscallarg(const char *) path; 1592 syscallarg(uid_t) uid; 1593 syscallarg(gid_t) gid; 1594 } */ *uap = v; 1595 int error; 1596 struct nameidata nd; 1597 1598 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1599 if ((error = namei(&nd)) != 0) 1600 return (error); 1601 1602 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1603 1604 vrele(nd.ni_vp); 1605 return (error); 1606 } 1607 1608 /* 1609 * Set ownership given a path name; this version follows links. 1610 * Provides POSIX semantics. 1611 */ 1612 /* ARGSUSED */ 1613 int 1614 sys___posix_chown(p, v, retval) 1615 struct proc *p; 1616 void *v; 1617 register_t *retval; 1618 { 1619 register struct sys_chown_args /* { 1620 syscallarg(const char *) path; 1621 syscallarg(uid_t) uid; 1622 syscallarg(gid_t) gid; 1623 } */ *uap = v; 1624 int error; 1625 struct nameidata nd; 1626 1627 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1628 if ((error = namei(&nd)) != 0) 1629 return (error); 1630 1631 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 1632 1633 vrele(nd.ni_vp); 1634 return (error); 1635 } 1636 1637 /* 1638 * Set ownership given a file descriptor. 1639 */ 1640 /* ARGSUSED */ 1641 int 1642 sys_fchown(p, v, retval) 1643 struct proc *p; 1644 void *v; 1645 register_t *retval; 1646 { 1647 register struct sys_fchown_args /* { 1648 syscallarg(int) fd; 1649 syscallarg(uid_t) uid; 1650 syscallarg(gid_t) gid; 1651 } */ *uap = v; 1652 int error; 1653 struct file *fp; 1654 1655 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1656 return (error); 1657 1658 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1659 SCARG(uap, gid), p, 0)); 1660 } 1661 1662 /* 1663 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 1664 */ 1665 /* ARGSUSED */ 1666 int 1667 sys___posix_fchown(p, v, retval) 1668 struct proc *p; 1669 void *v; 1670 register_t *retval; 1671 { 1672 register struct sys_fchown_args /* { 1673 syscallarg(int) fd; 1674 syscallarg(uid_t) uid; 1675 syscallarg(gid_t) gid; 1676 } */ *uap = v; 1677 int error; 1678 struct file *fp; 1679 1680 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1681 return (error); 1682 1683 return (change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 1684 SCARG(uap, gid), p, 1)); 1685 } 1686 1687 /* 1688 * Set ownership given a path name; this version does not follow links. 1689 */ 1690 /* ARGSUSED */ 1691 int 1692 sys_lchown(p, v, retval) 1693 struct proc *p; 1694 void *v; 1695 register_t *retval; 1696 { 1697 register struct sys_lchown_args /* { 1698 syscallarg(const char *) path; 1699 syscallarg(uid_t) uid; 1700 syscallarg(gid_t) gid; 1701 } */ *uap = v; 1702 int error; 1703 struct nameidata nd; 1704 1705 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1706 if ((error = namei(&nd)) != 0) 1707 return (error); 1708 1709 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 1710 1711 vrele(nd.ni_vp); 1712 return (error); 1713 } 1714 1715 /* 1716 * Set ownership given a path name; this version does not follow links. 1717 * Provides POSIX/XPG semantics. 1718 */ 1719 /* ARGSUSED */ 1720 int 1721 sys___posix_lchown(p, v, retval) 1722 struct proc *p; 1723 void *v; 1724 register_t *retval; 1725 { 1726 register struct sys_lchown_args /* { 1727 syscallarg(const char *) path; 1728 syscallarg(uid_t) uid; 1729 syscallarg(gid_t) gid; 1730 } */ *uap = v; 1731 int error; 1732 struct nameidata nd; 1733 1734 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1735 if ((error = namei(&nd)) != 0) 1736 return (error); 1737 1738 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 1739 1740 vrele(nd.ni_vp); 1741 return (error); 1742 } 1743 1744 /* 1745 * Common routine to set ownership given a vnode. 1746 */ 1747 static int 1748 change_owner(vp, uid, gid, p, posix_semantics) 1749 register struct vnode *vp; 1750 uid_t uid; 1751 gid_t gid; 1752 struct proc *p; 1753 int posix_semantics; 1754 { 1755 struct vattr vattr; 1756 mode_t newmode; 1757 int error; 1758 1759 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1760 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1761 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 1762 goto out; 1763 1764 #define CHANGED(x) ((x) != -1) 1765 newmode = vattr.va_mode; 1766 if (posix_semantics) { 1767 /* 1768 * POSIX/XPG semantics: if the caller is not the super-user, 1769 * clear set-user-id and set-group-id bits. Both POSIX and 1770 * the XPG consider the behaviour for calls by the super-user 1771 * implementation-defined; we leave the set-user-id and set- 1772 * group-id settings intact in that case. 1773 */ 1774 if (suser(p->p_ucred, NULL) != 0) 1775 newmode &= ~(S_ISUID | S_ISGID); 1776 } else { 1777 /* 1778 * NetBSD semantics: when changing owner and/or group, 1779 * clear the respective bit(s). 1780 */ 1781 if (CHANGED(uid)) 1782 newmode &= ~S_ISUID; 1783 if (CHANGED(gid)) 1784 newmode &= ~S_ISGID; 1785 } 1786 /* Update va_mode iff altered. */ 1787 if (vattr.va_mode == newmode) 1788 newmode = VNOVAL; 1789 1790 VATTR_NULL(&vattr); 1791 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 1792 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 1793 vattr.va_mode = newmode; 1794 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1795 #undef CHANGED 1796 1797 out: 1798 VOP_UNLOCK(vp, 0); 1799 return (error); 1800 } 1801 1802 /* 1803 * Set the access and modification times given a path name; this 1804 * version follows links. 1805 */ 1806 /* ARGSUSED */ 1807 int 1808 sys_utimes(p, v, retval) 1809 struct proc *p; 1810 void *v; 1811 register_t *retval; 1812 { 1813 register struct sys_utimes_args /* { 1814 syscallarg(const char *) path; 1815 syscallarg(const struct timeval *) tptr; 1816 } */ *uap = v; 1817 int error; 1818 struct nameidata nd; 1819 1820 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1821 if ((error = namei(&nd)) != 0) 1822 return (error); 1823 1824 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1825 1826 vrele(nd.ni_vp); 1827 return (error); 1828 } 1829 1830 /* 1831 * Set the access and modification times given a file descriptor. 1832 */ 1833 /* ARGSUSED */ 1834 int 1835 sys_futimes(p, v, retval) 1836 struct proc *p; 1837 void *v; 1838 register_t *retval; 1839 { 1840 register struct sys_futimes_args /* { 1841 syscallarg(int) fd; 1842 syscallarg(const struct timeval *) tptr; 1843 } */ *uap = v; 1844 int error; 1845 struct file *fp; 1846 1847 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1848 return (error); 1849 1850 return (change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), 1851 p)); 1852 } 1853 1854 /* 1855 * Set the access and modification times given a path name; this 1856 * version does not follow links. 1857 */ 1858 /* ARGSUSED */ 1859 int 1860 sys_lutimes(p, v, retval) 1861 struct proc *p; 1862 void *v; 1863 register_t *retval; 1864 { 1865 register struct sys_lutimes_args /* { 1866 syscallarg(const char *) path; 1867 syscallarg(const struct timeval *) tptr; 1868 } */ *uap = v; 1869 int error; 1870 struct nameidata nd; 1871 1872 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1873 if ((error = namei(&nd)) != 0) 1874 return (error); 1875 1876 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 1877 1878 vrele(nd.ni_vp); 1879 return (error); 1880 } 1881 1882 /* 1883 * Common routine to set access and modification times given a vnode. 1884 */ 1885 static int 1886 change_utimes(vp, tptr, p) 1887 struct vnode *vp; 1888 const struct timeval *tptr; 1889 struct proc *p; 1890 { 1891 struct timeval tv[2]; 1892 struct vattr vattr; 1893 int error; 1894 1895 VATTR_NULL(&vattr); 1896 if (tptr == NULL) { 1897 microtime(&tv[0]); 1898 tv[1] = tv[0]; 1899 vattr.va_vaflags |= VA_UTIMES_NULL; 1900 } else { 1901 error = copyin(tptr, tv, sizeof (tv)); 1902 if (error) 1903 return (error); 1904 } 1905 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1906 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1907 vattr.va_atime.tv_sec = tv[0].tv_sec; 1908 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 1909 vattr.va_mtime.tv_sec = tv[1].tv_sec; 1910 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 1911 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1912 VOP_UNLOCK(vp, 0); 1913 return (error); 1914 } 1915 1916 /* 1917 * Truncate a file given its path name. 1918 */ 1919 /* ARGSUSED */ 1920 int 1921 sys_truncate(p, v, retval) 1922 struct proc *p; 1923 void *v; 1924 register_t *retval; 1925 { 1926 register struct sys_truncate_args /* { 1927 syscallarg(const char *) path; 1928 syscallarg(int) pad; 1929 syscallarg(off_t) length; 1930 } */ *uap = v; 1931 register struct vnode *vp; 1932 struct vattr vattr; 1933 int error; 1934 struct nameidata nd; 1935 1936 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1937 if ((error = namei(&nd)) != 0) 1938 return (error); 1939 vp = nd.ni_vp; 1940 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1941 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1942 if (vp->v_type == VDIR) 1943 error = EISDIR; 1944 else if ((error = vn_writechk(vp)) == 0 && 1945 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 1946 VATTR_NULL(&vattr); 1947 vattr.va_size = SCARG(uap, length); 1948 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 1949 } 1950 vput(vp); 1951 return (error); 1952 } 1953 1954 /* 1955 * Truncate a file given a file descriptor. 1956 */ 1957 /* ARGSUSED */ 1958 int 1959 sys_ftruncate(p, v, retval) 1960 struct proc *p; 1961 void *v; 1962 register_t *retval; 1963 { 1964 register struct sys_ftruncate_args /* { 1965 syscallarg(int) fd; 1966 syscallarg(int) pad; 1967 syscallarg(off_t) length; 1968 } */ *uap = v; 1969 struct vattr vattr; 1970 struct vnode *vp; 1971 struct file *fp; 1972 int error; 1973 1974 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 1975 return (error); 1976 if ((fp->f_flag & FWRITE) == 0) 1977 return (EINVAL); 1978 vp = (struct vnode *)fp->f_data; 1979 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1980 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1981 if (vp->v_type == VDIR) 1982 error = EISDIR; 1983 else if ((error = vn_writechk(vp)) == 0) { 1984 VATTR_NULL(&vattr); 1985 vattr.va_size = SCARG(uap, length); 1986 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 1987 } 1988 VOP_UNLOCK(vp, 0); 1989 return (error); 1990 } 1991 1992 /* 1993 * Sync an open file. 1994 */ 1995 /* ARGSUSED */ 1996 int 1997 sys_fsync(p, v, retval) 1998 struct proc *p; 1999 void *v; 2000 register_t *retval; 2001 { 2002 struct sys_fsync_args /* { 2003 syscallarg(int) fd; 2004 } */ *uap = v; 2005 register struct vnode *vp; 2006 struct file *fp; 2007 int error; 2008 2009 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2010 return (error); 2011 vp = (struct vnode *)fp->f_data; 2012 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2013 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2014 VOP_UNLOCK(vp, 0); 2015 return (error); 2016 } 2017 2018 /* 2019 * Sync the data of an open file. 2020 */ 2021 /* ARGSUSED */ 2022 int 2023 sys_fdatasync(p, v, retval) 2024 struct proc *p; 2025 void *v; 2026 register_t *retval; 2027 { 2028 struct sys_fdatasync_args /* { 2029 syscallarg(int) fd; 2030 } */ *uap = v; 2031 struct vnode *vp; 2032 struct file *fp; 2033 int error; 2034 2035 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2036 return (error); 2037 vp = (struct vnode *)fp->f_data; 2038 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2039 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2040 VOP_UNLOCK(vp, 0); 2041 return (error); 2042 } 2043 2044 /* 2045 * Rename files, (standard) BSD semantics frontend. 2046 */ 2047 /* ARGSUSED */ 2048 int 2049 sys_rename(p, v, retval) 2050 struct proc *p; 2051 void *v; 2052 register_t *retval; 2053 { 2054 register struct sys_rename_args /* { 2055 syscallarg(const char *) from; 2056 syscallarg(const char *) to; 2057 } */ *uap = v; 2058 2059 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2060 } 2061 2062 /* 2063 * Rename files, POSIX semantics frontend. 2064 */ 2065 /* ARGSUSED */ 2066 int 2067 sys___posix_rename(p, v, retval) 2068 struct proc *p; 2069 void *v; 2070 register_t *retval; 2071 { 2072 register struct sys___posix_rename_args /* { 2073 syscallarg(const char *) from; 2074 syscallarg(const char *) to; 2075 } */ *uap = v; 2076 2077 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2078 } 2079 2080 /* 2081 * Rename files. Source and destination must either both be directories, 2082 * or both not be directories. If target is a directory, it must be empty. 2083 * If `from' and `to' refer to the same object, the value of the `retain' 2084 * argument is used to determine whether `from' will be 2085 * 2086 * (retain == 0) deleted unless `from' and `to' refer to the same 2087 * object in the file system's name space (BSD). 2088 * (retain == 1) always retained (POSIX). 2089 */ 2090 static int 2091 rename_files(from, to, p, retain) 2092 const char *from, *to; 2093 struct proc *p; 2094 int retain; 2095 { 2096 register struct vnode *tvp, *fvp, *tdvp; 2097 struct nameidata fromnd, tond; 2098 int error; 2099 2100 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2101 from, p); 2102 if ((error = namei(&fromnd)) != 0) 2103 return (error); 2104 fvp = fromnd.ni_vp; 2105 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2106 UIO_USERSPACE, to, p); 2107 if ((error = namei(&tond)) != 0) { 2108 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2109 vrele(fromnd.ni_dvp); 2110 vrele(fvp); 2111 goto out1; 2112 } 2113 tdvp = tond.ni_dvp; 2114 tvp = tond.ni_vp; 2115 2116 if (tvp != NULL) { 2117 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2118 error = ENOTDIR; 2119 goto out; 2120 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2121 error = EISDIR; 2122 goto out; 2123 } 2124 } 2125 2126 if (fvp == tdvp) 2127 error = EINVAL; 2128 2129 /* 2130 * Source and destination refer to the same object. 2131 */ 2132 if (fvp == tvp) { 2133 if (retain) 2134 error = -1; 2135 else if (fromnd.ni_dvp == tdvp && 2136 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2137 !bcmp(fromnd.ni_cnd.cn_nameptr, 2138 tond.ni_cnd.cn_nameptr, 2139 fromnd.ni_cnd.cn_namelen)) 2140 error = -1; 2141 } 2142 2143 out: 2144 if (!error) { 2145 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2146 if (fromnd.ni_dvp != tdvp) 2147 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2148 if (tvp) { 2149 #if defined(UVM) 2150 (void)uvm_vnp_uncache(tvp); 2151 #else 2152 (void)vnode_pager_uncache(tvp); 2153 #endif 2154 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2155 } 2156 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2157 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2158 } else { 2159 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2160 if (tdvp == tvp) 2161 vrele(tdvp); 2162 else 2163 vput(tdvp); 2164 if (tvp) 2165 vput(tvp); 2166 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2167 vrele(fromnd.ni_dvp); 2168 vrele(fvp); 2169 } 2170 vrele(tond.ni_startdir); 2171 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2172 out1: 2173 if (fromnd.ni_startdir) 2174 vrele(fromnd.ni_startdir); 2175 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2176 return (error == -1 ? 0 : error); 2177 } 2178 2179 /* 2180 * Make a directory file. 2181 */ 2182 /* ARGSUSED */ 2183 int 2184 sys_mkdir(p, v, retval) 2185 struct proc *p; 2186 void *v; 2187 register_t *retval; 2188 { 2189 register struct sys_mkdir_args /* { 2190 syscallarg(const char *) path; 2191 syscallarg(int) mode; 2192 } */ *uap = v; 2193 register struct vnode *vp; 2194 struct vattr vattr; 2195 int error; 2196 struct nameidata nd; 2197 2198 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2199 if ((error = namei(&nd)) != 0) 2200 return (error); 2201 vp = nd.ni_vp; 2202 if (vp != NULL) { 2203 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2204 if (nd.ni_dvp == vp) 2205 vrele(nd.ni_dvp); 2206 else 2207 vput(nd.ni_dvp); 2208 vrele(vp); 2209 return (EEXIST); 2210 } 2211 VATTR_NULL(&vattr); 2212 vattr.va_type = VDIR; 2213 vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; 2214 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2215 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2216 if (!error) 2217 vput(nd.ni_vp); 2218 return (error); 2219 } 2220 2221 /* 2222 * Remove a directory file. 2223 */ 2224 /* ARGSUSED */ 2225 int 2226 sys_rmdir(p, v, retval) 2227 struct proc *p; 2228 void *v; 2229 register_t *retval; 2230 { 2231 struct sys_rmdir_args /* { 2232 syscallarg(const char *) path; 2233 } */ *uap = v; 2234 register struct vnode *vp; 2235 int error; 2236 struct nameidata nd; 2237 2238 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2239 SCARG(uap, path), p); 2240 if ((error = namei(&nd)) != 0) 2241 return (error); 2242 vp = nd.ni_vp; 2243 if (vp->v_type != VDIR) { 2244 error = ENOTDIR; 2245 goto out; 2246 } 2247 /* 2248 * No rmdir "." please. 2249 */ 2250 if (nd.ni_dvp == vp) { 2251 error = EINVAL; 2252 goto out; 2253 } 2254 /* 2255 * The root of a mounted filesystem cannot be deleted. 2256 */ 2257 if (vp->v_flag & VROOT) 2258 error = EBUSY; 2259 out: 2260 if (!error) { 2261 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2262 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2263 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2264 } else { 2265 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2266 if (nd.ni_dvp == vp) 2267 vrele(nd.ni_dvp); 2268 else 2269 vput(nd.ni_dvp); 2270 vput(vp); 2271 } 2272 return (error); 2273 } 2274 2275 /* 2276 * Read a block of directory entries in a file system independent format. 2277 */ 2278 int 2279 sys_getdents(p, v, retval) 2280 struct proc *p; 2281 void *v; 2282 register_t *retval; 2283 { 2284 register struct sys_getdents_args /* { 2285 syscallarg(int) fd; 2286 syscallarg(char *) buf; 2287 syscallarg(size_t) count; 2288 } */ *uap = v; 2289 struct file *fp; 2290 int error, done; 2291 2292 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2293 return (error); 2294 if ((fp->f_flag & FREAD) == 0) 2295 return (EBADF); 2296 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2297 SCARG(uap, count), &done, p, 0, 0); 2298 *retval = done; 2299 return (error); 2300 } 2301 2302 /* 2303 * Set the mode mask for creation of filesystem nodes. 2304 */ 2305 int 2306 sys_umask(p, v, retval) 2307 struct proc *p; 2308 void *v; 2309 register_t *retval; 2310 { 2311 struct sys_umask_args /* { 2312 syscallarg(mode_t) newmask; 2313 } */ *uap = v; 2314 register struct filedesc *fdp; 2315 2316 fdp = p->p_fd; 2317 *retval = fdp->fd_cmask; 2318 fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; 2319 return (0); 2320 } 2321 2322 /* 2323 * Void all references to file by ripping underlying filesystem 2324 * away from vnode. 2325 */ 2326 /* ARGSUSED */ 2327 int 2328 sys_revoke(p, v, retval) 2329 struct proc *p; 2330 void *v; 2331 register_t *retval; 2332 { 2333 register struct sys_revoke_args /* { 2334 syscallarg(const char *) path; 2335 } */ *uap = v; 2336 register struct vnode *vp; 2337 struct vattr vattr; 2338 int error; 2339 struct nameidata nd; 2340 2341 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2342 if ((error = namei(&nd)) != 0) 2343 return (error); 2344 vp = nd.ni_vp; 2345 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2346 goto out; 2347 if (p->p_ucred->cr_uid != vattr.va_uid && 2348 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2349 goto out; 2350 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2351 VOP_REVOKE(vp, REVOKEALL); 2352 out: 2353 vrele(vp); 2354 return (error); 2355 } 2356 2357 /* 2358 * Convert a user file descriptor to a kernel file entry. 2359 */ 2360 int 2361 getvnode(fdp, fd, fpp) 2362 struct filedesc *fdp; 2363 int fd; 2364 struct file **fpp; 2365 { 2366 struct vnode *vp; 2367 struct file *fp; 2368 2369 if ((u_int)fd >= fdp->fd_nfiles || 2370 (fp = fdp->fd_ofiles[fd]) == NULL) 2371 return (EBADF); 2372 if (fp->f_type != DTYPE_VNODE) 2373 return (EINVAL); 2374 vp = (struct vnode *)fp->f_data; 2375 if (vp->v_type == VBAD) 2376 return (EBADF); 2377 *fpp = fp; 2378 return (0); 2379 } 2380
Indexes created Fri Oct 03 02:09:57 GMT 2025