vfs_syscalls.c revision 1.139
1 /* $NetBSD: vfs_syscalls.c,v 1.139 1999/07/01 18:58:16 wrstuden Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 41 */ 42 43 #include "opt_compat_netbsd.h" 44 #include "opt_compat_43.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/namei.h> 49 #include <sys/filedesc.h> 50 #include <sys/kernel.h> 51 #include <sys/file.h> 52 #include <sys/stat.h> 53 #include <sys/vnode.h> 54 #include <sys/mount.h> 55 #include <sys/proc.h> 56 #include <sys/uio.h> 57 #include <sys/malloc.h> 58 #include <sys/dirent.h> 59 60 #include <sys/syscallargs.h> 61 62 #include <vm/vm.h> 63 #include <sys/sysctl.h> 64 65 #include <uvm/uvm_extern.h> 66 67 static int change_dir __P((struct nameidata *, struct proc *)); 68 static int change_mode __P((struct vnode *, int, struct proc *p)); 69 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 70 int)); 71 static int change_utimes __P((struct vnode *vp, const struct timeval *, 72 struct proc *p)); 73 static int rename_files __P((const char *, const char *, struct proc *, int)); 74 75 void checkdirs __P((struct vnode *)); 76 int dounmount __P((struct mount *, int, struct proc *)); 77 78 /* 79 * Virtual File System System Calls 80 */ 81 82 /* 83 * Mount a file system. 84 */ 85 86 /* 87 * This table is used to maintain compatibility with 4.3BSD 88 * and NetBSD 0.9 mount syscalls. Note, the order is important! 89 * 90 * Also note that not all of these had actual numbers in 4.3BSD 91 * or NetBSD 0.9! 92 */ 93 const char *mountcompatnames[] = { 94 NULL, /* 0 = MOUNT_NONE */ 95 MOUNT_FFS, /* 1 */ 96 MOUNT_NFS, /* 2 */ 97 MOUNT_MFS, /* 3 */ 98 MOUNT_MSDOS, /* 4 */ 99 MOUNT_LFS, /* 5 */ 100 NULL, /* 6 = MOUNT_LOFS */ 101 MOUNT_FDESC, /* 7 */ 102 MOUNT_PORTAL, /* 8 */ 103 MOUNT_NULL, /* 9 */ 104 MOUNT_UMAP, /* 10 */ 105 MOUNT_KERNFS, /* 11 */ 106 MOUNT_PROCFS, /* 12 */ 107 MOUNT_AFS, /* 13 */ 108 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 109 MOUNT_UNION, /* 15 */ 110 MOUNT_ADOSFS, /* 16 */ 111 MOUNT_EXT2FS, /* 17 */ 112 MOUNT_CODA, /* 18 */ 113 MOUNT_FILECORE, /* 19 */ 114 MOUNT_NTFS, /* 20 */ 115 }; 116 const int nmountcompatnames = sizeof(mountcompatnames) / 117 sizeof(mountcompatnames[0]); 118 119 /* ARGSUSED */ 120 int 121 sys_mount(p, v, retval) 122 struct proc *p; 123 void *v; 124 register_t *retval; 125 { 126 register struct sys_mount_args /* { 127 syscallarg(const char *) type; 128 syscallarg(const char *) path; 129 syscallarg(int) flags; 130 syscallarg(void *) data; 131 } */ *uap = v; 132 struct vnode *vp; 133 struct mount *mp; 134 int error, flag = 0; 135 char fstypename[MFSNAMELEN]; 136 struct vattr va; 137 struct nameidata nd; 138 struct vfsops *vfs; 139 140 /* 141 * Get vnode to be covered 142 */ 143 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 144 SCARG(uap, path), p); 145 if ((error = namei(&nd)) != 0) 146 return (error); 147 vp = nd.ni_vp; 148 /* 149 * A lookup in VFS_MOUNT might result in an attempt to 150 * lock this vnode again, so make the lock resursive. 151 */ 152 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 153 if (SCARG(uap, flags) & MNT_UPDATE) { 154 if ((vp->v_flag & VROOT) == 0) { 155 vput(vp); 156 return (EINVAL); 157 } 158 mp = vp->v_mount; 159 flag = mp->mnt_flag; 160 vfs = mp->mnt_op; 161 /* 162 * We only allow the filesystem to be reloaded if it 163 * is currently mounted read-only. 164 */ 165 if ((SCARG(uap, flags) & MNT_RELOAD) && 166 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 167 vput(vp); 168 return (EOPNOTSUPP); /* Needs translation */ 169 } 170 /* 171 * In "highly secure" mode, don't let the caller do anything 172 * but downgrade a filesystem from read-write to read-only. 173 * (see also below; MNT_UPDATE is required.) 174 */ 175 if (securelevel >= 2 && 176 (SCARG(uap, flags) != 177 (mp->mnt_flag | MNT_RDONLY | 178 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 179 vput(vp); 180 return (EPERM); 181 } 182 mp->mnt_flag |= 183 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 184 /* 185 * Only root, or the user that did the original mount is 186 * permitted to update it. 187 */ 188 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 189 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 190 vput(vp); 191 return (error); 192 } 193 /* 194 * Do not allow NFS export by non-root users. For non-root 195 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 196 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 197 */ 198 if (p->p_ucred->cr_uid != 0) { 199 if (SCARG(uap, flags) & MNT_EXPORTED) { 200 vput(vp); 201 return (EPERM); 202 } 203 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 204 if (flag & MNT_NOEXEC) 205 SCARG(uap, flags) |= MNT_NOEXEC; 206 } 207 if (vfs_busy(mp, LK_NOWAIT, 0)) { 208 vput(vp); 209 return (EPERM); 210 } 211 VOP_UNLOCK(vp, 0); 212 goto update; 213 } else { 214 if (securelevel >= 2) 215 return (EPERM); 216 } 217 /* 218 * If the user is not root, ensure that they own the directory 219 * onto which we are attempting to mount. 220 */ 221 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 222 (va.va_uid != p->p_ucred->cr_uid && 223 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 224 vput(vp); 225 return (error); 226 } 227 /* 228 * Do not allow NFS export by non-root users. For non-root users, 229 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 230 * mount point is already MNT_NOEXEC. 231 */ 232 if (p->p_ucred->cr_uid != 0) { 233 if (SCARG(uap, flags) & MNT_EXPORTED) { 234 vput(vp); 235 return (EPERM); 236 } 237 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 238 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 239 SCARG(uap, flags) |= MNT_NOEXEC; 240 } 241 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 242 return (error); 243 if (vp->v_type != VDIR) { 244 vput(vp); 245 return (ENOTDIR); 246 } 247 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 248 if (error) { 249 #if defined(COMPAT_09) || defined(COMPAT_43) 250 /* 251 * Historically filesystem types were identified by number. 252 * If we get an integer for the filesystem type instead of a 253 * string, we check to see if it matches one of the historic 254 * filesystem types. 255 */ 256 u_long fsindex = (u_long)SCARG(uap, type); 257 if (fsindex >= nmountcompatnames || 258 mountcompatnames[fsindex] == NULL) { 259 vput(vp); 260 return (ENODEV); 261 } 262 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 263 #else 264 vput(vp); 265 return (error); 266 #endif 267 } 268 #ifdef COMPAT_10 269 /* Accept `ufs' as an alias for `ffs'. */ 270 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 271 strncpy(fstypename, "ffs", MFSNAMELEN); 272 #endif 273 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 274 vput(vp); 275 return (ENODEV); 276 } 277 if (vp->v_mountedhere != NULL) { 278 vput(vp); 279 return (EBUSY); 280 } 281 282 /* 283 * Allocate and initialize the file system. 284 */ 285 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 286 M_MOUNT, M_WAITOK); 287 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 288 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 289 (void)vfs_busy(mp, LK_NOWAIT, 0); 290 mp->mnt_op = vfs; 291 vfs->vfs_refcount++; 292 mp->mnt_vnodecovered = vp; 293 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 294 update: 295 /* 296 * Set the mount level flags. 297 */ 298 if (SCARG(uap, flags) & MNT_RDONLY) 299 mp->mnt_flag |= MNT_RDONLY; 300 else if (mp->mnt_flag & MNT_RDONLY) 301 mp->mnt_flag |= MNT_WANTRDWR; 302 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 303 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 304 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 305 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 306 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 307 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 308 /* 309 * Mount the filesystem. 310 */ 311 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 312 if (mp->mnt_flag & MNT_UPDATE) { 313 vrele(vp); 314 if (mp->mnt_flag & MNT_WANTRDWR) 315 mp->mnt_flag &= ~MNT_RDONLY; 316 mp->mnt_flag &=~ 317 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 318 if (error) 319 mp->mnt_flag = flag; 320 vfs_unbusy(mp); 321 return (error); 322 } 323 /* 324 * Put the new filesystem on the mount list after root. 325 */ 326 cache_purge(vp); 327 if (!error) { 328 vp->v_mountedhere = mp; 329 simple_lock(&mountlist_slock); 330 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 331 simple_unlock(&mountlist_slock); 332 checkdirs(vp); 333 VOP_UNLOCK(vp, 0); 334 vfs_unbusy(mp); 335 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 336 if ((error = VFS_START(mp, 0, p))) 337 vrele(vp); 338 } else { 339 vp->v_mountedhere = (struct mount *)0; 340 vfs->vfs_refcount--; 341 vfs_unbusy(mp); 342 free((caddr_t)mp, M_MOUNT); 343 vput(vp); 344 } 345 return (error); 346 } 347 348 /* 349 * Scan all active processes to see if any of them have a current 350 * or root directory onto which the new filesystem has just been 351 * mounted. If so, replace them with the new mount point. 352 */ 353 void 354 checkdirs(olddp) 355 struct vnode *olddp; 356 { 357 struct cwdinfo *cwdi; 358 struct vnode *newdp; 359 struct proc *p; 360 361 if (olddp->v_usecount == 1) 362 return; 363 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 364 panic("mount: lost mount"); 365 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 366 cwdi = p->p_cwdi; 367 if (cwdi->cwdi_cdir == olddp) { 368 vrele(cwdi->cwdi_cdir); 369 VREF(newdp); 370 cwdi->cwdi_cdir = newdp; 371 } 372 if (cwdi->cwdi_rdir == olddp) { 373 vrele(cwdi->cwdi_rdir); 374 VREF(newdp); 375 cwdi->cwdi_rdir = newdp; 376 } 377 } 378 if (rootvnode == olddp) { 379 vrele(rootvnode); 380 VREF(newdp); 381 rootvnode = newdp; 382 } 383 vput(newdp); 384 } 385 386 /* 387 * Unmount a file system. 388 * 389 * Note: unmount takes a path to the vnode mounted on as argument, 390 * not special file (as before). 391 */ 392 /* ARGSUSED */ 393 int 394 sys_unmount(p, v, retval) 395 struct proc *p; 396 void *v; 397 register_t *retval; 398 { 399 register struct sys_unmount_args /* { 400 syscallarg(const char *) path; 401 syscallarg(int) flags; 402 } */ *uap = v; 403 register struct vnode *vp; 404 struct mount *mp; 405 int error; 406 struct nameidata nd; 407 408 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 409 SCARG(uap, path), p); 410 if ((error = namei(&nd)) != 0) 411 return (error); 412 vp = nd.ni_vp; 413 mp = vp->v_mount; 414 415 /* 416 * Only root, or the user that did the original mount is 417 * permitted to unmount this filesystem. 418 */ 419 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 420 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 421 vput(vp); 422 return (error); 423 } 424 425 /* 426 * Don't allow unmounting the root file system. 427 */ 428 if (mp->mnt_flag & MNT_ROOTFS) { 429 vput(vp); 430 return (EINVAL); 431 } 432 433 /* 434 * Must be the root of the filesystem 435 */ 436 if ((vp->v_flag & VROOT) == 0) { 437 vput(vp); 438 return (EINVAL); 439 } 440 vput(vp); 441 442 if (vfs_busy(mp, 0, 0)) 443 return (EBUSY); 444 445 return (dounmount(mp, SCARG(uap, flags), p)); 446 } 447 448 /* 449 * Do the actual file system unmount. File system is assumed to have been 450 * marked busy by the caller. 451 */ 452 int 453 dounmount(mp, flags, p) 454 register struct mount *mp; 455 int flags; 456 struct proc *p; 457 { 458 struct vnode *coveredvp; 459 int error; 460 461 simple_lock(&mountlist_slock); 462 mp->mnt_flag |= MNT_UNMOUNT; 463 vfs_unbusy(mp); 464 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 465 if (mp->mnt_flag & MNT_EXPUBLIC) 466 vfs_setpublicfs(NULL, NULL, NULL); 467 mp->mnt_flag &=~ MNT_ASYNC; 468 cache_purgevfs(mp); /* remove cache entries for this file sys */ 469 if (((mp->mnt_flag & MNT_RDONLY) || 470 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 471 (flags & MNT_FORCE)) 472 error = VFS_UNMOUNT(mp, flags, p); 473 simple_lock(&mountlist_slock); 474 if (error) { 475 mp->mnt_flag &= ~MNT_UNMOUNT; 476 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 477 &mountlist_slock); 478 if (mp->mnt_flag & MNT_MWAIT) 479 wakeup((caddr_t)mp); 480 return (error); 481 } 482 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 483 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 484 coveredvp->v_mountedhere = NULL; 485 vrele(coveredvp); 486 } 487 mp->mnt_op->vfs_refcount--; 488 if (mp->mnt_vnodelist.lh_first != NULL) 489 panic("unmount: dangling vnode"); 490 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 491 if (mp->mnt_flag & MNT_MWAIT) 492 wakeup((caddr_t)mp); 493 free((caddr_t)mp, M_MOUNT); 494 return (0); 495 } 496 497 /* 498 * Sync each mounted filesystem. 499 */ 500 #ifdef DEBUG 501 int syncprt = 0; 502 struct ctldebug debug0 = { "syncprt", &syncprt }; 503 #endif 504 505 /* ARGSUSED */ 506 int 507 sys_sync(p, v, retval) 508 struct proc *p; 509 void *v; 510 register_t *retval; 511 { 512 register struct mount *mp, *nmp; 513 int asyncflag; 514 515 simple_lock(&mountlist_slock); 516 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 517 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 518 nmp = mp->mnt_list.cqe_prev; 519 continue; 520 } 521 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 522 asyncflag = mp->mnt_flag & MNT_ASYNC; 523 mp->mnt_flag &= ~MNT_ASYNC; 524 uvm_vnp_sync(mp); 525 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 526 if (asyncflag) 527 mp->mnt_flag |= MNT_ASYNC; 528 } 529 simple_lock(&mountlist_slock); 530 nmp = mp->mnt_list.cqe_prev; 531 vfs_unbusy(mp); 532 533 } 534 simple_unlock(&mountlist_slock); 535 #ifdef DEBUG 536 if (syncprt) 537 vfs_bufstats(); 538 #endif /* DEBUG */ 539 return (0); 540 } 541 542 /* 543 * Change filesystem quotas. 544 */ 545 /* ARGSUSED */ 546 int 547 sys_quotactl(p, v, retval) 548 struct proc *p; 549 void *v; 550 register_t *retval; 551 { 552 register struct sys_quotactl_args /* { 553 syscallarg(const char *) path; 554 syscallarg(int) cmd; 555 syscallarg(int) uid; 556 syscallarg(caddr_t) arg; 557 } */ *uap = v; 558 register struct mount *mp; 559 int error; 560 struct nameidata nd; 561 562 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 563 if ((error = namei(&nd)) != 0) 564 return (error); 565 mp = nd.ni_vp->v_mount; 566 vrele(nd.ni_vp); 567 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 568 SCARG(uap, arg), p)); 569 } 570 571 /* 572 * Get filesystem statistics. 573 */ 574 /* ARGSUSED */ 575 int 576 sys_statfs(p, v, retval) 577 struct proc *p; 578 void *v; 579 register_t *retval; 580 { 581 register struct sys_statfs_args /* { 582 syscallarg(const char *) path; 583 syscallarg(struct statfs *) buf; 584 } */ *uap = v; 585 register struct mount *mp; 586 register struct statfs *sp; 587 int error; 588 struct nameidata nd; 589 590 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 591 if ((error = namei(&nd)) != 0) 592 return (error); 593 mp = nd.ni_vp->v_mount; 594 sp = &mp->mnt_stat; 595 vrele(nd.ni_vp); 596 if ((error = VFS_STATFS(mp, sp, p)) != 0) 597 return (error); 598 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 599 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 600 } 601 602 /* 603 * Get filesystem statistics. 604 */ 605 /* ARGSUSED */ 606 int 607 sys_fstatfs(p, v, retval) 608 struct proc *p; 609 void *v; 610 register_t *retval; 611 { 612 register struct sys_fstatfs_args /* { 613 syscallarg(int) fd; 614 syscallarg(struct statfs *) buf; 615 } */ *uap = v; 616 struct file *fp; 617 struct mount *mp; 618 register struct statfs *sp; 619 int error; 620 621 /* getvnode() will use the descriptor for us */ 622 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 623 return (error); 624 mp = ((struct vnode *)fp->f_data)->v_mount; 625 sp = &mp->mnt_stat; 626 if ((error = VFS_STATFS(mp, sp, p)) != 0) 627 goto out; 628 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 629 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 630 out: 631 FILE_UNUSE(fp, p); 632 return (error); 633 } 634 635 /* 636 * Get statistics on all filesystems. 637 */ 638 int 639 sys_getfsstat(p, v, retval) 640 struct proc *p; 641 void *v; 642 register_t *retval; 643 { 644 register struct sys_getfsstat_args /* { 645 syscallarg(struct statfs *) buf; 646 syscallarg(long) bufsize; 647 syscallarg(int) flags; 648 } */ *uap = v; 649 register struct mount *mp, *nmp; 650 register struct statfs *sp; 651 caddr_t sfsp; 652 long count, maxcount, error; 653 654 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 655 sfsp = (caddr_t)SCARG(uap, buf); 656 simple_lock(&mountlist_slock); 657 count = 0; 658 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 659 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 660 nmp = mp->mnt_list.cqe_next; 661 continue; 662 } 663 if (sfsp && count < maxcount) { 664 sp = &mp->mnt_stat; 665 /* 666 * If MNT_NOWAIT is specified, do not refresh the 667 * fsstat cache. MNT_WAIT overrides MNT_NOWAIT. 668 */ 669 if (((SCARG(uap, flags) & MNT_NOWAIT) == 0 || 670 (SCARG(uap, flags) & MNT_WAIT)) && 671 (error = VFS_STATFS(mp, sp, p)) != 0) { 672 simple_lock(&mountlist_slock); 673 nmp = mp->mnt_list.cqe_next; 674 vfs_unbusy(mp); 675 continue; 676 } 677 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 678 error = copyout(sp, sfsp, sizeof(*sp)); 679 if (error) { 680 vfs_unbusy(mp); 681 return (error); 682 } 683 sfsp += sizeof(*sp); 684 } 685 count++; 686 simple_lock(&mountlist_slock); 687 nmp = mp->mnt_list.cqe_next; 688 vfs_unbusy(mp); 689 } 690 simple_unlock(&mountlist_slock); 691 if (sfsp && count > maxcount) 692 *retval = maxcount; 693 else 694 *retval = count; 695 return (0); 696 } 697 698 /* 699 * Change current working directory to a given file descriptor. 700 */ 701 /* ARGSUSED */ 702 int 703 sys_fchdir(p, v, retval) 704 struct proc *p; 705 void *v; 706 register_t *retval; 707 { 708 struct sys_fchdir_args /* { 709 syscallarg(int) fd; 710 } */ *uap = v; 711 struct filedesc *fdp = p->p_fd; 712 struct cwdinfo *cwdi = p->p_cwdi; 713 struct vnode *vp, *tdp; 714 struct mount *mp; 715 struct file *fp; 716 int error; 717 718 /* getvnode() will use the descriptor for us */ 719 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 720 return (error); 721 vp = (struct vnode *)fp->f_data; 722 723 VREF(vp); 724 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 725 if (vp->v_type != VDIR) 726 error = ENOTDIR; 727 else 728 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 729 while (!error && (mp = vp->v_mountedhere) != NULL) { 730 if (vfs_busy(mp, 0, 0)) 731 continue; 732 error = VFS_ROOT(mp, &tdp); 733 vfs_unbusy(mp); 734 if (error) 735 break; 736 vput(vp); 737 vp = tdp; 738 } 739 if (error) { 740 vput(vp); 741 goto out; 742 } 743 VOP_UNLOCK(vp, 0); 744 745 /* 746 * Disallow changing to a directory not under the process's 747 * current root directory (if there is one). 748 */ 749 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 750 vrele(vp); 751 error = EPERM; /* operation not permitted */ 752 goto out; 753 } 754 755 vrele(cwdi->cwdi_cdir); 756 cwdi->cwdi_cdir = vp; 757 out: 758 FILE_UNUSE(fp, p); 759 return (error); 760 } 761 762 /* 763 * Change this process's notion of the root directory to a given file descriptor. 764 */ 765 766 int 767 sys_fchroot(p, v, retval) 768 struct proc *p; 769 void *v; 770 register_t *retval; 771 { 772 struct sys_fchroot_args *uap = v; 773 struct filedesc *fdp = p->p_fd; 774 struct cwdinfo *cwdi = p->p_cwdi; 775 struct vnode *vp; 776 struct file *fp; 777 int error; 778 779 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 780 return error; 781 /* getvnode() will use the descriptor for us */ 782 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 783 return error; 784 vp = (struct vnode *) fp->f_data; 785 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 786 if (vp->v_type != VDIR) 787 error = ENOTDIR; 788 else 789 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 790 VOP_UNLOCK(vp, 0); 791 if (error) 792 goto out; 793 VREF(vp); 794 795 /* 796 * Prevent escaping from chroot by putting the root under 797 * the working directory. Silently chdir to / if we aren't 798 * already there. 799 */ 800 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 801 /* 802 * XXX would be more failsafe to change directory to a 803 * deadfs node here instead 804 */ 805 vrele(cwdi->cwdi_cdir); 806 VREF(vp); 807 cwdi->cwdi_cdir = vp; 808 } 809 810 if (cwdi->cwdi_rdir != NULL) 811 vrele(cwdi->cwdi_rdir); 812 cwdi->cwdi_rdir = vp; 813 out: 814 FILE_UNUSE(fp, p); 815 return (error); 816 } 817 818 819 820 /* 821 * Change current working directory (``.''). 822 */ 823 /* ARGSUSED */ 824 int 825 sys_chdir(p, v, retval) 826 struct proc *p; 827 void *v; 828 register_t *retval; 829 { 830 struct sys_chdir_args /* { 831 syscallarg(const char *) path; 832 } */ *uap = v; 833 struct cwdinfo *cwdi = p->p_cwdi; 834 int error; 835 struct nameidata nd; 836 837 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 838 SCARG(uap, path), p); 839 if ((error = change_dir(&nd, p)) != 0) 840 return (error); 841 vrele(cwdi->cwdi_cdir); 842 cwdi->cwdi_cdir = nd.ni_vp; 843 return (0); 844 } 845 846 /* 847 * Change notion of root (``/'') directory. 848 */ 849 /* ARGSUSED */ 850 int 851 sys_chroot(p, v, retval) 852 struct proc *p; 853 void *v; 854 register_t *retval; 855 { 856 struct sys_chroot_args /* { 857 syscallarg(const char *) path; 858 } */ *uap = v; 859 struct cwdinfo *cwdi = p->p_cwdi; 860 struct vnode *vp; 861 int error; 862 struct nameidata nd; 863 864 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 865 return (error); 866 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 867 SCARG(uap, path), p); 868 if ((error = change_dir(&nd, p)) != 0) 869 return (error); 870 if (cwdi->cwdi_rdir != NULL) 871 vrele(cwdi->cwdi_rdir); 872 vp = nd.ni_vp; 873 cwdi->cwdi_rdir = vp; 874 875 /* 876 * Prevent escaping from chroot by putting the root under 877 * the working directory. Silently chdir to / if we aren't 878 * already there. 879 */ 880 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 881 /* 882 * XXX would be more failsafe to change directory to a 883 * deadfs node here instead 884 */ 885 vrele(cwdi->cwdi_cdir); 886 VREF(vp); 887 cwdi->cwdi_cdir = vp; 888 } 889 890 return (0); 891 } 892 893 /* 894 * Common routine for chroot and chdir. 895 */ 896 static int 897 change_dir(ndp, p) 898 register struct nameidata *ndp; 899 struct proc *p; 900 { 901 struct vnode *vp; 902 int error; 903 904 if ((error = namei(ndp)) != 0) 905 return (error); 906 vp = ndp->ni_vp; 907 if (vp->v_type != VDIR) 908 error = ENOTDIR; 909 else 910 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 911 912 if (error) 913 vput(vp); 914 else 915 VOP_UNLOCK(vp, 0); 916 return (error); 917 } 918 919 /* 920 * Check permissions, allocate an open file structure, 921 * and call the device open routine if any. 922 */ 923 int 924 sys_open(p, v, retval) 925 struct proc *p; 926 void *v; 927 register_t *retval; 928 { 929 register struct sys_open_args /* { 930 syscallarg(const char *) path; 931 syscallarg(int) flags; 932 syscallarg(int) mode; 933 } */ *uap = v; 934 struct cwdinfo *cwdi = p->p_cwdi; 935 struct filedesc *fdp = p->p_fd; 936 struct file *fp; 937 struct vnode *vp; 938 int flags, cmode; 939 int type, indx, error; 940 struct flock lf; 941 struct nameidata nd; 942 extern struct fileops vnops; 943 944 flags = FFLAGS(SCARG(uap, flags)); 945 if ((flags & (FREAD | FWRITE)) == 0) 946 return (EINVAL); 947 /* falloc() will use the file descriptor for us */ 948 if ((error = falloc(p, &fp, &indx)) != 0) 949 return (error); 950 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 951 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 952 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 953 if ((error = vn_open(&nd, flags, cmode)) != 0) { 954 FILE_UNUSE(fp, p); 955 ffree(fp); 956 if ((error == ENODEV || error == ENXIO) && 957 p->p_dupfd >= 0 && /* XXX from fdopen */ 958 (error = 959 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 960 *retval = indx; 961 return (0); 962 } 963 if (error == ERESTART) 964 error = EINTR; 965 fdp->fd_ofiles[indx] = NULL; 966 return (error); 967 } 968 p->p_dupfd = 0; 969 vp = nd.ni_vp; 970 fp->f_flag = flags & FMASK; 971 fp->f_type = DTYPE_VNODE; 972 fp->f_ops = &vnops; 973 fp->f_data = (caddr_t)vp; 974 if (flags & (O_EXLOCK | O_SHLOCK)) { 975 lf.l_whence = SEEK_SET; 976 lf.l_start = 0; 977 lf.l_len = 0; 978 if (flags & O_EXLOCK) 979 lf.l_type = F_WRLCK; 980 else 981 lf.l_type = F_RDLCK; 982 type = F_FLOCK; 983 if ((flags & FNONBLOCK) == 0) 984 type |= F_WAIT; 985 VOP_UNLOCK(vp, 0); 986 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 987 if (error) { 988 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 989 FILE_UNUSE(fp, p); 990 ffree(fp); 991 fdp->fd_ofiles[indx] = NULL; 992 return (error); 993 } 994 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 995 fp->f_flag |= FHASLOCK; 996 } 997 VOP_UNLOCK(vp, 0); 998 *retval = indx; 999 FILE_UNUSE(fp, p); 1000 return (0); 1001 } 1002 1003 /* 1004 * Get file handle system call 1005 */ 1006 int 1007 sys_getfh(p, v, retval) 1008 struct proc *p; 1009 register void *v; 1010 register_t *retval; 1011 { 1012 register struct sys_getfh_args /* { 1013 syscallarg(char *) fname; 1014 syscallarg(fhandle_t *) fhp; 1015 } */ *uap = v; 1016 register struct vnode *vp; 1017 fhandle_t fh; 1018 int error; 1019 struct nameidata nd; 1020 1021 /* 1022 * Must be super user 1023 */ 1024 error = suser(p->p_ucred, &p->p_acflag); 1025 if (error) 1026 return (error); 1027 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1028 SCARG(uap, fname), p); 1029 error = namei(&nd); 1030 if (error) 1031 return (error); 1032 vp = nd.ni_vp; 1033 memset((caddr_t)&fh, 0, sizeof(fh)); 1034 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1035 error = VFS_VPTOFH(vp, &fh.fh_fid); 1036 vput(vp); 1037 if (error) 1038 return (error); 1039 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1040 return (error); 1041 } 1042 1043 /* 1044 * Open a file given a file handle. 1045 * 1046 * Check permissions, allocate an open file structure, 1047 * and call the device open routine if any. 1048 */ 1049 int 1050 sys_fhopen(p, v, retval) 1051 struct proc *p; 1052 void *v; 1053 register_t *retval; 1054 { 1055 register struct sys_fhopen_args /* { 1056 syscallarg(const fhandle_t *) fhp; 1057 syscallarg(int) flags; 1058 } */ *uap = v; 1059 struct filedesc *fdp = p->p_fd; 1060 struct file *fp; 1061 struct vnode *vp = NULL; 1062 struct mount *mp; 1063 struct ucred *cred = p->p_ucred; 1064 int flags; 1065 struct file *nfp; 1066 int type, indx, error=0; 1067 struct flock lf; 1068 struct vattr va; 1069 fhandle_t fh; 1070 extern struct fileops vnops; 1071 1072 /* 1073 * Must be super user 1074 */ 1075 if ((error = suser(p->p_ucred, &p->p_acflag))) 1076 return (error); 1077 1078 flags = FFLAGS(SCARG(uap, flags)); 1079 if ((flags & (FREAD | FWRITE)) == 0) 1080 return (EINVAL); 1081 if ((flags & O_CREAT)) 1082 return (EINVAL); 1083 /* falloc() will use the file descriptor for us */ 1084 if ((error = falloc(p, &nfp, &indx)) != 0) 1085 return (error); 1086 fp = nfp; 1087 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1088 goto bad; 1089 1090 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1091 error = ESTALE; 1092 goto bad; 1093 } 1094 1095 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1096 vp = NULL; /* most likely unnecessary sanity for bad: */ 1097 goto bad; 1098 } 1099 1100 /* Now do an effective vn_open */ 1101 1102 if (vp->v_type == VSOCK) { 1103 error = EOPNOTSUPP; 1104 goto bad; 1105 } 1106 if (flags & FREAD) { 1107 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1108 goto bad; 1109 } 1110 if (flags & (FWRITE | O_TRUNC)) { 1111 if (vp->v_type == VDIR) { 1112 error = EISDIR; 1113 goto bad; 1114 } 1115 if ((error = vn_writechk(vp)) != 0 || 1116 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1117 goto bad; 1118 } 1119 if (flags & O_TRUNC) { 1120 VOP_UNLOCK(vp, 0); /* XXX */ 1121 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1122 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1123 VATTR_NULL(&va); 1124 va.va_size = 0; 1125 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1126 goto bad; 1127 } 1128 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1129 goto bad; 1130 if (flags & FWRITE) 1131 vp->v_writecount++; 1132 1133 /* done with modified vn_open, now finish what sys_open does. */ 1134 1135 fp->f_flag = flags & FMASK; 1136 fp->f_type = DTYPE_VNODE; 1137 fp->f_ops = &vnops; 1138 fp->f_data = (caddr_t)vp; 1139 if (flags & (O_EXLOCK | O_SHLOCK)) { 1140 lf.l_whence = SEEK_SET; 1141 lf.l_start = 0; 1142 lf.l_len = 0; 1143 if (flags & O_EXLOCK) 1144 lf.l_type = F_WRLCK; 1145 else 1146 lf.l_type = F_RDLCK; 1147 type = F_FLOCK; 1148 if ((flags & FNONBLOCK) == 0) 1149 type |= F_WAIT; 1150 VOP_UNLOCK(vp, 0); 1151 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1152 if (error) { 1153 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1154 FILE_UNUSE(fp, p); 1155 ffree(fp); 1156 fdp->fd_ofiles[indx] = NULL; 1157 return (error); 1158 } 1159 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1160 fp->f_flag |= FHASLOCK; 1161 } 1162 VOP_UNLOCK(vp, 0); 1163 *retval = indx; 1164 FILE_UNUSE(fp, p); 1165 return (0); 1166 1167 bad: 1168 FILE_UNUSE(fp, p); 1169 ffree(fp); 1170 fdp->fd_ofiles[indx] = NULL; 1171 if (vp != NULL) 1172 vput(vp); 1173 return (error); 1174 } 1175 1176 /* ARGSUSED */ 1177 int 1178 sys_fhstat(p, v, retval) 1179 struct proc *p; 1180 void *v; 1181 register_t *retval; 1182 { 1183 register struct sys_fhstat_args /* { 1184 syscallarg(const fhandle_t *) fhp; 1185 syscallarg(struct stat *) sb; 1186 } */ *uap = v; 1187 struct stat sb; 1188 int error; 1189 fhandle_t fh; 1190 struct mount *mp; 1191 struct vnode *vp; 1192 1193 /* 1194 * Must be super user 1195 */ 1196 if ((error = suser(p->p_ucred, &p->p_acflag))) 1197 return (error); 1198 1199 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1200 return (error); 1201 1202 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1203 return (ESTALE); 1204 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1205 return (error); 1206 error = vn_stat(vp, &sb, p); 1207 vput(vp); 1208 if (error) 1209 return (error); 1210 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1211 return (error); 1212 } 1213 1214 /* ARGSUSED */ 1215 int 1216 sys_fhstatfs(p, v, retval) 1217 struct proc *p; 1218 void *v; 1219 register_t *retval; 1220 { 1221 register struct sys_fhstatfs_args /* 1222 syscallarg(const fhandle_t *) fhp; 1223 syscallarg(struct statfs *) buf; 1224 } */ *uap = v; 1225 struct statfs sp; 1226 fhandle_t fh; 1227 struct mount *mp; 1228 struct vnode *vp; 1229 int error; 1230 1231 /* 1232 * Must be super user 1233 */ 1234 if ((error = suser(p->p_ucred, &p->p_acflag))) 1235 return (error); 1236 1237 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1238 return (error); 1239 1240 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1241 return (ESTALE); 1242 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1243 return (error); 1244 mp = vp->v_mount; 1245 vput(vp); 1246 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1247 return (error); 1248 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1249 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1250 } 1251 1252 /* 1253 * Create a special file. 1254 */ 1255 /* ARGSUSED */ 1256 int 1257 sys_mknod(p, v, retval) 1258 struct proc *p; 1259 void *v; 1260 register_t *retval; 1261 { 1262 register struct sys_mknod_args /* { 1263 syscallarg(const char *) path; 1264 syscallarg(int) mode; 1265 syscallarg(int) dev; 1266 } */ *uap = v; 1267 register struct vnode *vp; 1268 struct vattr vattr; 1269 int error; 1270 int whiteout = 0; 1271 struct nameidata nd; 1272 1273 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1274 return (error); 1275 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1276 if ((error = namei(&nd)) != 0) 1277 return (error); 1278 vp = nd.ni_vp; 1279 if (vp != NULL) 1280 error = EEXIST; 1281 else { 1282 VATTR_NULL(&vattr); 1283 vattr.va_mode = 1284 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1285 vattr.va_rdev = SCARG(uap, dev); 1286 whiteout = 0; 1287 1288 switch (SCARG(uap, mode) & S_IFMT) { 1289 case S_IFMT: /* used by badsect to flag bad sectors */ 1290 vattr.va_type = VBAD; 1291 break; 1292 case S_IFCHR: 1293 vattr.va_type = VCHR; 1294 break; 1295 case S_IFBLK: 1296 vattr.va_type = VBLK; 1297 break; 1298 case S_IFWHT: 1299 whiteout = 1; 1300 break; 1301 default: 1302 error = EINVAL; 1303 break; 1304 } 1305 } 1306 if (!error) { 1307 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1308 if (whiteout) { 1309 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1310 if (error) 1311 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1312 vput(nd.ni_dvp); 1313 } else { 1314 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1315 &nd.ni_cnd, &vattr); 1316 } 1317 } else { 1318 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1319 if (nd.ni_dvp == vp) 1320 vrele(nd.ni_dvp); 1321 else 1322 vput(nd.ni_dvp); 1323 if (vp) 1324 vrele(vp); 1325 } 1326 return (error); 1327 } 1328 1329 /* 1330 * Create a named pipe. 1331 */ 1332 /* ARGSUSED */ 1333 int 1334 sys_mkfifo(p, v, retval) 1335 struct proc *p; 1336 void *v; 1337 register_t *retval; 1338 { 1339 register struct sys_mkfifo_args /* { 1340 syscallarg(const char *) path; 1341 syscallarg(int) mode; 1342 } */ *uap = v; 1343 struct vattr vattr; 1344 int error; 1345 struct nameidata nd; 1346 1347 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1348 if ((error = namei(&nd)) != 0) 1349 return (error); 1350 if (nd.ni_vp != NULL) { 1351 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1352 if (nd.ni_dvp == nd.ni_vp) 1353 vrele(nd.ni_dvp); 1354 else 1355 vput(nd.ni_dvp); 1356 vrele(nd.ni_vp); 1357 return (EEXIST); 1358 } 1359 VATTR_NULL(&vattr); 1360 vattr.va_type = VFIFO; 1361 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1362 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1363 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1364 } 1365 1366 /* 1367 * Make a hard file link. 1368 */ 1369 /* ARGSUSED */ 1370 int 1371 sys_link(p, v, retval) 1372 struct proc *p; 1373 void *v; 1374 register_t *retval; 1375 { 1376 register struct sys_link_args /* { 1377 syscallarg(const char *) path; 1378 syscallarg(const char *) link; 1379 } */ *uap = v; 1380 register struct vnode *vp; 1381 struct nameidata nd; 1382 int error; 1383 1384 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1385 if ((error = namei(&nd)) != 0) 1386 return (error); 1387 vp = nd.ni_vp; 1388 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1389 if ((error = namei(&nd)) != 0) 1390 goto out; 1391 if (nd.ni_vp) { 1392 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1393 if (nd.ni_dvp == nd.ni_vp) 1394 vrele(nd.ni_dvp); 1395 else 1396 vput(nd.ni_dvp); 1397 vrele(nd.ni_vp); 1398 error = EEXIST; 1399 goto out; 1400 } 1401 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1402 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1403 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1404 out: 1405 vrele(vp); 1406 return (error); 1407 } 1408 1409 /* 1410 * Make a symbolic link. 1411 */ 1412 /* ARGSUSED */ 1413 int 1414 sys_symlink(p, v, retval) 1415 struct proc *p; 1416 void *v; 1417 register_t *retval; 1418 { 1419 register struct sys_symlink_args /* { 1420 syscallarg(const char *) path; 1421 syscallarg(const char *) link; 1422 } */ *uap = v; 1423 struct vattr vattr; 1424 char *path; 1425 int error; 1426 struct nameidata nd; 1427 1428 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1429 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1430 if (error) 1431 goto out; 1432 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1433 if ((error = namei(&nd)) != 0) 1434 goto out; 1435 if (nd.ni_vp) { 1436 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1437 if (nd.ni_dvp == nd.ni_vp) 1438 vrele(nd.ni_dvp); 1439 else 1440 vput(nd.ni_dvp); 1441 vrele(nd.ni_vp); 1442 error = EEXIST; 1443 goto out; 1444 } 1445 VATTR_NULL(&vattr); 1446 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1447 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1448 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1449 out: 1450 FREE(path, M_NAMEI); 1451 return (error); 1452 } 1453 1454 /* 1455 * Delete a whiteout from the filesystem. 1456 */ 1457 /* ARGSUSED */ 1458 int 1459 sys_undelete(p, v, retval) 1460 struct proc *p; 1461 void *v; 1462 register_t *retval; 1463 { 1464 register struct sys_undelete_args /* { 1465 syscallarg(const char *) path; 1466 } */ *uap = v; 1467 int error; 1468 struct nameidata nd; 1469 1470 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1471 SCARG(uap, path), p); 1472 error = namei(&nd); 1473 if (error) 1474 return (error); 1475 1476 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1477 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1478 if (nd.ni_dvp == nd.ni_vp) 1479 vrele(nd.ni_dvp); 1480 else 1481 vput(nd.ni_dvp); 1482 if (nd.ni_vp) 1483 vrele(nd.ni_vp); 1484 return (EEXIST); 1485 } 1486 1487 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1488 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1489 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1490 vput(nd.ni_dvp); 1491 return (error); 1492 } 1493 1494 /* 1495 * Delete a name from the filesystem. 1496 */ 1497 /* ARGSUSED */ 1498 int 1499 sys_unlink(p, v, retval) 1500 struct proc *p; 1501 void *v; 1502 register_t *retval; 1503 { 1504 struct sys_unlink_args /* { 1505 syscallarg(const char *) path; 1506 } */ *uap = v; 1507 register struct vnode *vp; 1508 int error; 1509 struct nameidata nd; 1510 1511 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1512 SCARG(uap, path), p); 1513 if ((error = namei(&nd)) != 0) 1514 return (error); 1515 vp = nd.ni_vp; 1516 1517 /* 1518 * The root of a mounted filesystem cannot be deleted. 1519 */ 1520 if (vp->v_flag & VROOT) { 1521 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1522 if (nd.ni_dvp == vp) 1523 vrele(nd.ni_dvp); 1524 else 1525 vput(nd.ni_dvp); 1526 vput(vp); 1527 error = EBUSY; 1528 goto out; 1529 } 1530 1531 (void)uvm_vnp_uncache(vp); 1532 1533 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1534 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1535 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1536 out: 1537 return (error); 1538 } 1539 1540 /* 1541 * Reposition read/write file offset. 1542 */ 1543 int 1544 sys_lseek(p, v, retval) 1545 struct proc *p; 1546 void *v; 1547 register_t *retval; 1548 { 1549 register struct sys_lseek_args /* { 1550 syscallarg(int) fd; 1551 syscallarg(int) pad; 1552 syscallarg(off_t) offset; 1553 syscallarg(int) whence; 1554 } */ *uap = v; 1555 struct ucred *cred = p->p_ucred; 1556 register struct filedesc *fdp = p->p_fd; 1557 register struct file *fp; 1558 struct vnode *vp; 1559 struct vattr vattr; 1560 register off_t newoff; 1561 int error; 1562 1563 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1564 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1565 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1566 return (EBADF); 1567 1568 FILE_USE(fp); 1569 1570 vp = (struct vnode *)fp->f_data; 1571 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1572 error = ESPIPE; 1573 goto out; 1574 } 1575 1576 switch (SCARG(uap, whence)) { 1577 case SEEK_CUR: 1578 newoff = fp->f_offset + SCARG(uap, offset); 1579 break; 1580 case SEEK_END: 1581 error = VOP_GETATTR(vp, &vattr, cred, p); 1582 if (error) 1583 goto out; 1584 newoff = SCARG(uap, offset) + vattr.va_size; 1585 break; 1586 case SEEK_SET: 1587 newoff = SCARG(uap, offset); 1588 break; 1589 default: 1590 error = EINVAL; 1591 goto out; 1592 } 1593 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1594 goto out; 1595 1596 *(off_t *)retval = fp->f_offset = newoff; 1597 out: 1598 FILE_UNUSE(fp, p); 1599 return (error); 1600 } 1601 1602 /* 1603 * Positional read system call. 1604 */ 1605 int 1606 sys_pread(p, v, retval) 1607 struct proc *p; 1608 void *v; 1609 register_t *retval; 1610 { 1611 struct sys_pread_args /* { 1612 syscallarg(int) fd; 1613 syscallarg(void *) buf; 1614 syscallarg(size_t) nbyte; 1615 syscallarg(off_t) offset; 1616 } */ *uap = v; 1617 struct filedesc *fdp = p->p_fd; 1618 struct file *fp; 1619 struct vnode *vp; 1620 off_t offset; 1621 int error, fd = SCARG(uap, fd); 1622 1623 if ((u_int)fd >= fdp->fd_nfiles || 1624 (fp = fdp->fd_ofiles[fd]) == NULL || 1625 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1626 (fp->f_flag & FREAD) == 0) 1627 return (EBADF); 1628 1629 FILE_USE(fp); 1630 1631 vp = (struct vnode *)fp->f_data; 1632 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1633 error = ESPIPE; 1634 goto out; 1635 } 1636 1637 offset = SCARG(uap, offset); 1638 1639 /* 1640 * XXX This works because no file systems actually 1641 * XXX take any action on the seek operation. 1642 */ 1643 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1644 goto out; 1645 1646 /* dofileread() will unuse the descriptor for us */ 1647 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1648 &offset, 0, retval)); 1649 1650 out: 1651 FILE_UNUSE(fp, p); 1652 return (error); 1653 } 1654 1655 /* 1656 * Positional scatter read system call. 1657 */ 1658 int 1659 sys_preadv(p, v, retval) 1660 struct proc *p; 1661 void *v; 1662 register_t *retval; 1663 { 1664 struct sys_preadv_args /* { 1665 syscallarg(int) fd; 1666 syscallarg(const struct iovec *) iovp; 1667 syscallarg(int) iovcnt; 1668 syscallarg(off_t) offset; 1669 } */ *uap = v; 1670 struct filedesc *fdp = p->p_fd; 1671 struct file *fp; 1672 struct vnode *vp; 1673 off_t offset; 1674 int error, fd = SCARG(uap, fd); 1675 1676 if ((u_int)fd >= fdp->fd_nfiles || 1677 (fp = fdp->fd_ofiles[fd]) == NULL || 1678 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1679 (fp->f_flag & FREAD) == 0) 1680 return (EBADF); 1681 1682 FILE_USE(fp); 1683 1684 vp = (struct vnode *)fp->f_data; 1685 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1686 error = ESPIPE; 1687 goto out; 1688 } 1689 1690 offset = SCARG(uap, offset); 1691 1692 /* 1693 * XXX This works because no file systems actually 1694 * XXX take any action on the seek operation. 1695 */ 1696 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1697 goto out; 1698 1699 /* dofilereadv() will unuse the descriptor for us */ 1700 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1701 &offset, 0, retval)); 1702 1703 out: 1704 FILE_UNUSE(fp, p); 1705 return (error); 1706 } 1707 1708 /* 1709 * Positional write system call. 1710 */ 1711 int 1712 sys_pwrite(p, v, retval) 1713 struct proc *p; 1714 void *v; 1715 register_t *retval; 1716 { 1717 struct sys_pwrite_args /* { 1718 syscallarg(int) fd; 1719 syscallarg(const void *) buf; 1720 syscallarg(size_t) nbyte; 1721 syscallarg(off_t) offset; 1722 } */ *uap = v; 1723 struct filedesc *fdp = p->p_fd; 1724 struct file *fp; 1725 struct vnode *vp; 1726 off_t offset; 1727 int error, fd = SCARG(uap, fd); 1728 1729 if ((u_int)fd >= fdp->fd_nfiles || 1730 (fp = fdp->fd_ofiles[fd]) == NULL || 1731 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1732 (fp->f_flag & FWRITE) == 0) 1733 return (EBADF); 1734 1735 FILE_USE(fp); 1736 1737 vp = (struct vnode *)fp->f_data; 1738 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1739 error = ESPIPE; 1740 goto out; 1741 } 1742 1743 offset = SCARG(uap, offset); 1744 1745 /* 1746 * XXX This works because no file systems actually 1747 * XXX take any action on the seek operation. 1748 */ 1749 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1750 goto out; 1751 1752 /* dofilewrite() will unuse the descriptor for us */ 1753 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1754 &offset, 0, retval)); 1755 1756 out: 1757 FILE_UNUSE(fp, p); 1758 return (error); 1759 } 1760 1761 /* 1762 * Positional gather write system call. 1763 */ 1764 int 1765 sys_pwritev(p, v, retval) 1766 struct proc *p; 1767 void *v; 1768 register_t *retval; 1769 { 1770 struct sys_pwritev_args /* { 1771 syscallarg(int) fd; 1772 syscallarg(const struct iovec *) iovp; 1773 syscallarg(int) iovcnt; 1774 syscallarg(off_t) offset; 1775 } */ *uap = v; 1776 struct filedesc *fdp = p->p_fd; 1777 struct file *fp; 1778 struct vnode *vp; 1779 off_t offset; 1780 int error, fd = SCARG(uap, fd); 1781 1782 if ((u_int)fd >= fdp->fd_nfiles || 1783 (fp = fdp->fd_ofiles[fd]) == NULL || 1784 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1785 (fp->f_flag & FWRITE) == 0) 1786 return (EBADF); 1787 1788 FILE_USE(fp); 1789 1790 vp = (struct vnode *)fp->f_data; 1791 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1792 error = ESPIPE; 1793 goto out; 1794 } 1795 1796 offset = SCARG(uap, offset); 1797 1798 /* 1799 * XXX This works because no file systems actually 1800 * XXX take any action on the seek operation. 1801 */ 1802 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1803 goto out; 1804 1805 /* dofilewritev() will unuse the descriptor for us */ 1806 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1807 &offset, 0, retval)); 1808 1809 out: 1810 FILE_UNUSE(fp, p); 1811 return (error); 1812 } 1813 1814 /* 1815 * Check access permissions. 1816 */ 1817 int 1818 sys_access(p, v, retval) 1819 struct proc *p; 1820 void *v; 1821 register_t *retval; 1822 { 1823 register struct sys_access_args /* { 1824 syscallarg(const char *) path; 1825 syscallarg(int) flags; 1826 } */ *uap = v; 1827 register struct ucred *cred = p->p_ucred; 1828 register struct vnode *vp; 1829 int error, flags, t_gid, t_uid; 1830 struct nameidata nd; 1831 1832 t_uid = cred->cr_uid; 1833 t_gid = cred->cr_gid; 1834 cred->cr_uid = p->p_cred->p_ruid; 1835 cred->cr_gid = p->p_cred->p_rgid; 1836 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1837 SCARG(uap, path), p); 1838 if ((error = namei(&nd)) != 0) 1839 goto out1; 1840 vp = nd.ni_vp; 1841 1842 /* Flags == 0 means only check for existence. */ 1843 if (SCARG(uap, flags)) { 1844 flags = 0; 1845 if (SCARG(uap, flags) & R_OK) 1846 flags |= VREAD; 1847 if (SCARG(uap, flags) & W_OK) 1848 flags |= VWRITE; 1849 if (SCARG(uap, flags) & X_OK) 1850 flags |= VEXEC; 1851 1852 error = VOP_ACCESS(vp, flags, cred, p); 1853 if (!error && (flags & VWRITE)) 1854 error = vn_writechk(vp); 1855 } 1856 vput(vp); 1857 out1: 1858 cred->cr_uid = t_uid; 1859 cred->cr_gid = t_gid; 1860 return (error); 1861 } 1862 1863 /* 1864 * Get file status; this version follows links. 1865 */ 1866 /* ARGSUSED */ 1867 int 1868 sys___stat13(p, v, retval) 1869 struct proc *p; 1870 void *v; 1871 register_t *retval; 1872 { 1873 register struct sys___stat13_args /* { 1874 syscallarg(const char *) path; 1875 syscallarg(struct stat *) ub; 1876 } */ *uap = v; 1877 struct stat sb; 1878 int error; 1879 struct nameidata nd; 1880 1881 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1882 SCARG(uap, path), p); 1883 if ((error = namei(&nd)) != 0) 1884 return (error); 1885 error = vn_stat(nd.ni_vp, &sb, p); 1886 vput(nd.ni_vp); 1887 if (error) 1888 return (error); 1889 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1890 return (error); 1891 } 1892 1893 /* 1894 * Get file status; this version does not follow links. 1895 */ 1896 /* ARGSUSED */ 1897 int 1898 sys___lstat13(p, v, retval) 1899 struct proc *p; 1900 void *v; 1901 register_t *retval; 1902 { 1903 register struct sys___lstat13_args /* { 1904 syscallarg(const char *) path; 1905 syscallarg(struct stat *) ub; 1906 } */ *uap = v; 1907 struct stat sb; 1908 int error; 1909 struct nameidata nd; 1910 1911 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1912 SCARG(uap, path), p); 1913 if ((error = namei(&nd)) != 0) 1914 return (error); 1915 error = vn_stat(nd.ni_vp, &sb, p); 1916 vput(nd.ni_vp); 1917 if (error) 1918 return (error); 1919 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1920 return (error); 1921 } 1922 1923 /* 1924 * Get configurable pathname variables. 1925 */ 1926 /* ARGSUSED */ 1927 int 1928 sys_pathconf(p, v, retval) 1929 struct proc *p; 1930 void *v; 1931 register_t *retval; 1932 { 1933 register struct sys_pathconf_args /* { 1934 syscallarg(const char *) path; 1935 syscallarg(int) name; 1936 } */ *uap = v; 1937 int error; 1938 struct nameidata nd; 1939 1940 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1941 SCARG(uap, path), p); 1942 if ((error = namei(&nd)) != 0) 1943 return (error); 1944 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1945 vput(nd.ni_vp); 1946 return (error); 1947 } 1948 1949 /* 1950 * Return target name of a symbolic link. 1951 */ 1952 /* ARGSUSED */ 1953 int 1954 sys_readlink(p, v, retval) 1955 struct proc *p; 1956 void *v; 1957 register_t *retval; 1958 { 1959 register struct sys_readlink_args /* { 1960 syscallarg(const char *) path; 1961 syscallarg(char *) buf; 1962 syscallarg(size_t) count; 1963 } */ *uap = v; 1964 register struct vnode *vp; 1965 struct iovec aiov; 1966 struct uio auio; 1967 int error; 1968 struct nameidata nd; 1969 1970 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1971 SCARG(uap, path), p); 1972 if ((error = namei(&nd)) != 0) 1973 return (error); 1974 vp = nd.ni_vp; 1975 if (vp->v_type != VLNK) 1976 error = EINVAL; 1977 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1978 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1979 aiov.iov_base = SCARG(uap, buf); 1980 aiov.iov_len = SCARG(uap, count); 1981 auio.uio_iov = &aiov; 1982 auio.uio_iovcnt = 1; 1983 auio.uio_offset = 0; 1984 auio.uio_rw = UIO_READ; 1985 auio.uio_segflg = UIO_USERSPACE; 1986 auio.uio_procp = p; 1987 auio.uio_resid = SCARG(uap, count); 1988 error = VOP_READLINK(vp, &auio, p->p_ucred); 1989 } 1990 vput(vp); 1991 *retval = SCARG(uap, count) - auio.uio_resid; 1992 return (error); 1993 } 1994 1995 /* 1996 * Change flags of a file given a path name. 1997 */ 1998 /* ARGSUSED */ 1999 int 2000 sys_chflags(p, v, retval) 2001 struct proc *p; 2002 void *v; 2003 register_t *retval; 2004 { 2005 register struct sys_chflags_args /* { 2006 syscallarg(const char *) path; 2007 syscallarg(u_long) flags; 2008 } */ *uap = v; 2009 register struct vnode *vp; 2010 struct vattr vattr; 2011 int error; 2012 struct nameidata nd; 2013 2014 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2015 if ((error = namei(&nd)) != 0) 2016 return (error); 2017 vp = nd.ni_vp; 2018 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2019 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2020 VATTR_NULL(&vattr); 2021 vattr.va_flags = SCARG(uap, flags); 2022 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2023 vput(vp); 2024 return (error); 2025 } 2026 2027 /* 2028 * Change flags of a file given a file descriptor. 2029 */ 2030 /* ARGSUSED */ 2031 int 2032 sys_fchflags(p, v, retval) 2033 struct proc *p; 2034 void *v; 2035 register_t *retval; 2036 { 2037 register struct sys_fchflags_args /* { 2038 syscallarg(int) fd; 2039 syscallarg(u_long) flags; 2040 } */ *uap = v; 2041 struct vattr vattr; 2042 struct vnode *vp; 2043 struct file *fp; 2044 int error; 2045 2046 /* getvnode() will use the descriptor for us */ 2047 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2048 return (error); 2049 vp = (struct vnode *)fp->f_data; 2050 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2051 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2052 VATTR_NULL(&vattr); 2053 vattr.va_flags = SCARG(uap, flags); 2054 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2055 VOP_UNLOCK(vp, 0); 2056 FILE_UNUSE(fp, p); 2057 return (error); 2058 } 2059 2060 /* 2061 * Change mode of a file given path name; this version follows links. 2062 */ 2063 /* ARGSUSED */ 2064 int 2065 sys_chmod(p, v, retval) 2066 struct proc *p; 2067 void *v; 2068 register_t *retval; 2069 { 2070 register struct sys_chmod_args /* { 2071 syscallarg(const char *) path; 2072 syscallarg(int) mode; 2073 } */ *uap = v; 2074 int error; 2075 struct nameidata nd; 2076 2077 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2078 if ((error = namei(&nd)) != 0) 2079 return (error); 2080 2081 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2082 2083 vrele(nd.ni_vp); 2084 return (error); 2085 } 2086 2087 /* 2088 * Change mode of a file given a file descriptor. 2089 */ 2090 /* ARGSUSED */ 2091 int 2092 sys_fchmod(p, v, retval) 2093 struct proc *p; 2094 void *v; 2095 register_t *retval; 2096 { 2097 register struct sys_fchmod_args /* { 2098 syscallarg(int) fd; 2099 syscallarg(int) mode; 2100 } */ *uap = v; 2101 struct file *fp; 2102 int error; 2103 2104 /* getvnode() will use the descriptor for us */ 2105 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2106 return (error); 2107 2108 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2109 FILE_UNUSE(fp, p); 2110 return (error); 2111 } 2112 2113 /* 2114 * Change mode of a file given path name; this version does not follow links. 2115 */ 2116 /* ARGSUSED */ 2117 int 2118 sys_lchmod(p, v, retval) 2119 struct proc *p; 2120 void *v; 2121 register_t *retval; 2122 { 2123 register struct sys_lchmod_args /* { 2124 syscallarg(const char *) path; 2125 syscallarg(int) mode; 2126 } */ *uap = v; 2127 int error; 2128 struct nameidata nd; 2129 2130 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2131 if ((error = namei(&nd)) != 0) 2132 return (error); 2133 2134 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2135 2136 vrele(nd.ni_vp); 2137 return (error); 2138 } 2139 2140 /* 2141 * Common routine to set mode given a vnode. 2142 */ 2143 static int 2144 change_mode(vp, mode, p) 2145 struct vnode *vp; 2146 int mode; 2147 struct proc *p; 2148 { 2149 struct vattr vattr; 2150 int error; 2151 2152 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2153 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2154 VATTR_NULL(&vattr); 2155 vattr.va_mode = mode & ALLPERMS; 2156 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2157 VOP_UNLOCK(vp, 0); 2158 return (error); 2159 } 2160 2161 /* 2162 * Set ownership given a path name; this version follows links. 2163 */ 2164 /* ARGSUSED */ 2165 int 2166 sys_chown(p, v, retval) 2167 struct proc *p; 2168 void *v; 2169 register_t *retval; 2170 { 2171 register struct sys_chown_args /* { 2172 syscallarg(const char *) path; 2173 syscallarg(uid_t) uid; 2174 syscallarg(gid_t) gid; 2175 } */ *uap = v; 2176 int error; 2177 struct nameidata nd; 2178 2179 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2180 if ((error = namei(&nd)) != 0) 2181 return (error); 2182 2183 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2184 2185 vrele(nd.ni_vp); 2186 return (error); 2187 } 2188 2189 /* 2190 * Set ownership given a path name; this version follows links. 2191 * Provides POSIX semantics. 2192 */ 2193 /* ARGSUSED */ 2194 int 2195 sys___posix_chown(p, v, retval) 2196 struct proc *p; 2197 void *v; 2198 register_t *retval; 2199 { 2200 register struct sys_chown_args /* { 2201 syscallarg(const char *) path; 2202 syscallarg(uid_t) uid; 2203 syscallarg(gid_t) gid; 2204 } */ *uap = v; 2205 int error; 2206 struct nameidata nd; 2207 2208 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2209 if ((error = namei(&nd)) != 0) 2210 return (error); 2211 2212 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2213 2214 vrele(nd.ni_vp); 2215 return (error); 2216 } 2217 2218 /* 2219 * Set ownership given a file descriptor. 2220 */ 2221 /* ARGSUSED */ 2222 int 2223 sys_fchown(p, v, retval) 2224 struct proc *p; 2225 void *v; 2226 register_t *retval; 2227 { 2228 register struct sys_fchown_args /* { 2229 syscallarg(int) fd; 2230 syscallarg(uid_t) uid; 2231 syscallarg(gid_t) gid; 2232 } */ *uap = v; 2233 int error; 2234 struct file *fp; 2235 2236 /* getvnode() will use the descriptor for us */ 2237 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2238 return (error); 2239 2240 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2241 SCARG(uap, gid), p, 0); 2242 FILE_UNUSE(fp, p); 2243 return (error); 2244 } 2245 2246 /* 2247 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2248 */ 2249 /* ARGSUSED */ 2250 int 2251 sys___posix_fchown(p, v, retval) 2252 struct proc *p; 2253 void *v; 2254 register_t *retval; 2255 { 2256 register struct sys_fchown_args /* { 2257 syscallarg(int) fd; 2258 syscallarg(uid_t) uid; 2259 syscallarg(gid_t) gid; 2260 } */ *uap = v; 2261 int error; 2262 struct file *fp; 2263 2264 /* getvnode() will use the descriptor for us */ 2265 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2266 return (error); 2267 2268 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2269 SCARG(uap, gid), p, 1); 2270 FILE_UNUSE(fp, p); 2271 return (error); 2272 } 2273 2274 /* 2275 * Set ownership given a path name; this version does not follow links. 2276 */ 2277 /* ARGSUSED */ 2278 int 2279 sys_lchown(p, v, retval) 2280 struct proc *p; 2281 void *v; 2282 register_t *retval; 2283 { 2284 register struct sys_lchown_args /* { 2285 syscallarg(const char *) path; 2286 syscallarg(uid_t) uid; 2287 syscallarg(gid_t) gid; 2288 } */ *uap = v; 2289 int error; 2290 struct nameidata nd; 2291 2292 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2293 if ((error = namei(&nd)) != 0) 2294 return (error); 2295 2296 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2297 2298 vrele(nd.ni_vp); 2299 return (error); 2300 } 2301 2302 /* 2303 * Set ownership given a path name; this version does not follow links. 2304 * Provides POSIX/XPG semantics. 2305 */ 2306 /* ARGSUSED */ 2307 int 2308 sys___posix_lchown(p, v, retval) 2309 struct proc *p; 2310 void *v; 2311 register_t *retval; 2312 { 2313 register struct sys_lchown_args /* { 2314 syscallarg(const char *) path; 2315 syscallarg(uid_t) uid; 2316 syscallarg(gid_t) gid; 2317 } */ *uap = v; 2318 int error; 2319 struct nameidata nd; 2320 2321 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2322 if ((error = namei(&nd)) != 0) 2323 return (error); 2324 2325 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2326 2327 vrele(nd.ni_vp); 2328 return (error); 2329 } 2330 2331 /* 2332 * Common routine to set ownership given a vnode. 2333 */ 2334 static int 2335 change_owner(vp, uid, gid, p, posix_semantics) 2336 register struct vnode *vp; 2337 uid_t uid; 2338 gid_t gid; 2339 struct proc *p; 2340 int posix_semantics; 2341 { 2342 struct vattr vattr; 2343 mode_t newmode; 2344 int error; 2345 2346 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2347 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2348 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2349 goto out; 2350 2351 #define CHANGED(x) ((x) != -1) 2352 newmode = vattr.va_mode; 2353 if (posix_semantics) { 2354 /* 2355 * POSIX/XPG semantics: if the caller is not the super-user, 2356 * clear set-user-id and set-group-id bits. Both POSIX and 2357 * the XPG consider the behaviour for calls by the super-user 2358 * implementation-defined; we leave the set-user-id and set- 2359 * group-id settings intact in that case. 2360 */ 2361 if (suser(p->p_ucred, NULL) != 0) 2362 newmode &= ~(S_ISUID | S_ISGID); 2363 } else { 2364 /* 2365 * NetBSD semantics: when changing owner and/or group, 2366 * clear the respective bit(s). 2367 */ 2368 if (CHANGED(uid)) 2369 newmode &= ~S_ISUID; 2370 if (CHANGED(gid)) 2371 newmode &= ~S_ISGID; 2372 } 2373 /* Update va_mode iff altered. */ 2374 if (vattr.va_mode == newmode) 2375 newmode = VNOVAL; 2376 2377 VATTR_NULL(&vattr); 2378 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2379 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2380 vattr.va_mode = newmode; 2381 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2382 #undef CHANGED 2383 2384 out: 2385 VOP_UNLOCK(vp, 0); 2386 return (error); 2387 } 2388 2389 /* 2390 * Set the access and modification times given a path name; this 2391 * version follows links. 2392 */ 2393 /* ARGSUSED */ 2394 int 2395 sys_utimes(p, v, retval) 2396 struct proc *p; 2397 void *v; 2398 register_t *retval; 2399 { 2400 register struct sys_utimes_args /* { 2401 syscallarg(const char *) path; 2402 syscallarg(const struct timeval *) tptr; 2403 } */ *uap = v; 2404 int error; 2405 struct nameidata nd; 2406 2407 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2408 if ((error = namei(&nd)) != 0) 2409 return (error); 2410 2411 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2412 2413 vrele(nd.ni_vp); 2414 return (error); 2415 } 2416 2417 /* 2418 * Set the access and modification times given a file descriptor. 2419 */ 2420 /* ARGSUSED */ 2421 int 2422 sys_futimes(p, v, retval) 2423 struct proc *p; 2424 void *v; 2425 register_t *retval; 2426 { 2427 register struct sys_futimes_args /* { 2428 syscallarg(int) fd; 2429 syscallarg(const struct timeval *) tptr; 2430 } */ *uap = v; 2431 int error; 2432 struct file *fp; 2433 2434 /* getvnode() will use the descriptor for us */ 2435 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2436 return (error); 2437 2438 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2439 FILE_UNUSE(fp, p); 2440 return (error); 2441 } 2442 2443 /* 2444 * Set the access and modification times given a path name; this 2445 * version does not follow links. 2446 */ 2447 /* ARGSUSED */ 2448 int 2449 sys_lutimes(p, v, retval) 2450 struct proc *p; 2451 void *v; 2452 register_t *retval; 2453 { 2454 register struct sys_lutimes_args /* { 2455 syscallarg(const char *) path; 2456 syscallarg(const struct timeval *) tptr; 2457 } */ *uap = v; 2458 int error; 2459 struct nameidata nd; 2460 2461 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2462 if ((error = namei(&nd)) != 0) 2463 return (error); 2464 2465 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2466 2467 vrele(nd.ni_vp); 2468 return (error); 2469 } 2470 2471 /* 2472 * Common routine to set access and modification times given a vnode. 2473 */ 2474 static int 2475 change_utimes(vp, tptr, p) 2476 struct vnode *vp; 2477 const struct timeval *tptr; 2478 struct proc *p; 2479 { 2480 struct timeval tv[2]; 2481 struct vattr vattr; 2482 int error; 2483 2484 VATTR_NULL(&vattr); 2485 if (tptr == NULL) { 2486 microtime(&tv[0]); 2487 tv[1] = tv[0]; 2488 vattr.va_vaflags |= VA_UTIMES_NULL; 2489 } else { 2490 error = copyin(tptr, tv, sizeof(tv)); 2491 if (error) 2492 return (error); 2493 } 2494 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2495 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2496 vattr.va_atime.tv_sec = tv[0].tv_sec; 2497 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2498 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2499 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2500 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2501 VOP_UNLOCK(vp, 0); 2502 return (error); 2503 } 2504 2505 /* 2506 * Truncate a file given its path name. 2507 */ 2508 /* ARGSUSED */ 2509 int 2510 sys_truncate(p, v, retval) 2511 struct proc *p; 2512 void *v; 2513 register_t *retval; 2514 { 2515 register struct sys_truncate_args /* { 2516 syscallarg(const char *) path; 2517 syscallarg(int) pad; 2518 syscallarg(off_t) length; 2519 } */ *uap = v; 2520 register struct vnode *vp; 2521 struct vattr vattr; 2522 int error; 2523 struct nameidata nd; 2524 2525 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2526 if ((error = namei(&nd)) != 0) 2527 return (error); 2528 vp = nd.ni_vp; 2529 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2530 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2531 if (vp->v_type == VDIR) 2532 error = EISDIR; 2533 else if ((error = vn_writechk(vp)) == 0 && 2534 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2535 VATTR_NULL(&vattr); 2536 vattr.va_size = SCARG(uap, length); 2537 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2538 } 2539 vput(vp); 2540 return (error); 2541 } 2542 2543 /* 2544 * Truncate a file given a file descriptor. 2545 */ 2546 /* ARGSUSED */ 2547 int 2548 sys_ftruncate(p, v, retval) 2549 struct proc *p; 2550 void *v; 2551 register_t *retval; 2552 { 2553 register struct sys_ftruncate_args /* { 2554 syscallarg(int) fd; 2555 syscallarg(int) pad; 2556 syscallarg(off_t) length; 2557 } */ *uap = v; 2558 struct vattr vattr; 2559 struct vnode *vp; 2560 struct file *fp; 2561 int error; 2562 2563 /* getvnode() will use the descriptor for us */ 2564 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2565 return (error); 2566 if ((fp->f_flag & FWRITE) == 0) { 2567 error = EINVAL; 2568 goto out; 2569 } 2570 vp = (struct vnode *)fp->f_data; 2571 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2572 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2573 if (vp->v_type == VDIR) 2574 error = EISDIR; 2575 else if ((error = vn_writechk(vp)) == 0) { 2576 VATTR_NULL(&vattr); 2577 vattr.va_size = SCARG(uap, length); 2578 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2579 } 2580 VOP_UNLOCK(vp, 0); 2581 out: 2582 FILE_UNUSE(fp, p); 2583 return (error); 2584 } 2585 2586 /* 2587 * Sync an open file. 2588 */ 2589 /* ARGSUSED */ 2590 int 2591 sys_fsync(p, v, retval) 2592 struct proc *p; 2593 void *v; 2594 register_t *retval; 2595 { 2596 struct sys_fsync_args /* { 2597 syscallarg(int) fd; 2598 } */ *uap = v; 2599 register struct vnode *vp; 2600 struct file *fp; 2601 int error; 2602 2603 /* getvnode() will use the descriptor for us */ 2604 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2605 return (error); 2606 vp = (struct vnode *)fp->f_data; 2607 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2608 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2609 VOP_UNLOCK(vp, 0); 2610 FILE_UNUSE(fp, p); 2611 return (error); 2612 } 2613 2614 /* 2615 * Sync the data of an open file. 2616 */ 2617 /* ARGSUSED */ 2618 int 2619 sys_fdatasync(p, v, retval) 2620 struct proc *p; 2621 void *v; 2622 register_t *retval; 2623 { 2624 struct sys_fdatasync_args /* { 2625 syscallarg(int) fd; 2626 } */ *uap = v; 2627 struct vnode *vp; 2628 struct file *fp; 2629 int error; 2630 2631 /* getvnode() will use the descriptor for us */ 2632 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2633 return (error); 2634 vp = (struct vnode *)fp->f_data; 2635 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2636 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2637 VOP_UNLOCK(vp, 0); 2638 FILE_UNUSE(fp, p); 2639 return (error); 2640 } 2641 2642 /* 2643 * Rename files, (standard) BSD semantics frontend. 2644 */ 2645 /* ARGSUSED */ 2646 int 2647 sys_rename(p, v, retval) 2648 struct proc *p; 2649 void *v; 2650 register_t *retval; 2651 { 2652 register struct sys_rename_args /* { 2653 syscallarg(const char *) from; 2654 syscallarg(const char *) to; 2655 } */ *uap = v; 2656 2657 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2658 } 2659 2660 /* 2661 * Rename files, POSIX semantics frontend. 2662 */ 2663 /* ARGSUSED */ 2664 int 2665 sys___posix_rename(p, v, retval) 2666 struct proc *p; 2667 void *v; 2668 register_t *retval; 2669 { 2670 register struct sys___posix_rename_args /* { 2671 syscallarg(const char *) from; 2672 syscallarg(const char *) to; 2673 } */ *uap = v; 2674 2675 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2676 } 2677 2678 /* 2679 * Rename files. Source and destination must either both be directories, 2680 * or both not be directories. If target is a directory, it must be empty. 2681 * If `from' and `to' refer to the same object, the value of the `retain' 2682 * argument is used to determine whether `from' will be 2683 * 2684 * (retain == 0) deleted unless `from' and `to' refer to the same 2685 * object in the file system's name space (BSD). 2686 * (retain == 1) always retained (POSIX). 2687 */ 2688 static int 2689 rename_files(from, to, p, retain) 2690 const char *from, *to; 2691 struct proc *p; 2692 int retain; 2693 { 2694 register struct vnode *tvp, *fvp, *tdvp; 2695 struct nameidata fromnd, tond; 2696 int error; 2697 2698 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2699 from, p); 2700 if ((error = namei(&fromnd)) != 0) 2701 return (error); 2702 fvp = fromnd.ni_vp; 2703 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2704 UIO_USERSPACE, to, p); 2705 if ((error = namei(&tond)) != 0) { 2706 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2707 vrele(fromnd.ni_dvp); 2708 vrele(fvp); 2709 goto out1; 2710 } 2711 tdvp = tond.ni_dvp; 2712 tvp = tond.ni_vp; 2713 2714 if (tvp != NULL) { 2715 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2716 error = ENOTDIR; 2717 goto out; 2718 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2719 error = EISDIR; 2720 goto out; 2721 } 2722 } 2723 2724 if (fvp == tdvp) 2725 error = EINVAL; 2726 2727 /* 2728 * Source and destination refer to the same object. 2729 */ 2730 if (fvp == tvp) { 2731 if (retain) 2732 error = -1; 2733 else if (fromnd.ni_dvp == tdvp && 2734 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2735 !memcmp(fromnd.ni_cnd.cn_nameptr, 2736 tond.ni_cnd.cn_nameptr, 2737 fromnd.ni_cnd.cn_namelen)) 2738 error = -1; 2739 } 2740 2741 out: 2742 if (!error) { 2743 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2744 if (fromnd.ni_dvp != tdvp) 2745 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2746 if (tvp) { 2747 (void)uvm_vnp_uncache(tvp); 2748 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2749 } 2750 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2751 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2752 } else { 2753 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2754 if (tdvp == tvp) 2755 vrele(tdvp); 2756 else 2757 vput(tdvp); 2758 if (tvp) 2759 vput(tvp); 2760 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2761 vrele(fromnd.ni_dvp); 2762 vrele(fvp); 2763 } 2764 vrele(tond.ni_startdir); 2765 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2766 out1: 2767 if (fromnd.ni_startdir) 2768 vrele(fromnd.ni_startdir); 2769 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2770 return (error == -1 ? 0 : error); 2771 } 2772 2773 /* 2774 * Make a directory file. 2775 */ 2776 /* ARGSUSED */ 2777 int 2778 sys_mkdir(p, v, retval) 2779 struct proc *p; 2780 void *v; 2781 register_t *retval; 2782 { 2783 register struct sys_mkdir_args /* { 2784 syscallarg(const char *) path; 2785 syscallarg(int) mode; 2786 } */ *uap = v; 2787 register struct vnode *vp; 2788 struct vattr vattr; 2789 int error; 2790 struct nameidata nd; 2791 2792 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2793 if ((error = namei(&nd)) != 0) 2794 return (error); 2795 vp = nd.ni_vp; 2796 if (vp != NULL) { 2797 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2798 if (nd.ni_dvp == vp) 2799 vrele(nd.ni_dvp); 2800 else 2801 vput(nd.ni_dvp); 2802 vrele(vp); 2803 return (EEXIST); 2804 } 2805 VATTR_NULL(&vattr); 2806 vattr.va_type = VDIR; 2807 vattr.va_mode = 2808 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2809 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2810 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2811 if (!error) 2812 vput(nd.ni_vp); 2813 return (error); 2814 } 2815 2816 /* 2817 * Remove a directory file. 2818 */ 2819 /* ARGSUSED */ 2820 int 2821 sys_rmdir(p, v, retval) 2822 struct proc *p; 2823 void *v; 2824 register_t *retval; 2825 { 2826 struct sys_rmdir_args /* { 2827 syscallarg(const char *) path; 2828 } */ *uap = v; 2829 register struct vnode *vp; 2830 int error; 2831 struct nameidata nd; 2832 2833 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2834 SCARG(uap, path), p); 2835 if ((error = namei(&nd)) != 0) 2836 return (error); 2837 vp = nd.ni_vp; 2838 if (vp->v_type != VDIR) { 2839 error = ENOTDIR; 2840 goto out; 2841 } 2842 /* 2843 * No rmdir "." please. 2844 */ 2845 if (nd.ni_dvp == vp) { 2846 error = EINVAL; 2847 goto out; 2848 } 2849 /* 2850 * The root of a mounted filesystem cannot be deleted. 2851 */ 2852 if (vp->v_flag & VROOT) 2853 error = EBUSY; 2854 out: 2855 if (!error) { 2856 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2857 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2858 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2859 } else { 2860 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2861 if (nd.ni_dvp == vp) 2862 vrele(nd.ni_dvp); 2863 else 2864 vput(nd.ni_dvp); 2865 vput(vp); 2866 } 2867 return (error); 2868 } 2869 2870 /* 2871 * Read a block of directory entries in a file system independent format. 2872 */ 2873 int 2874 sys_getdents(p, v, retval) 2875 struct proc *p; 2876 void *v; 2877 register_t *retval; 2878 { 2879 register struct sys_getdents_args /* { 2880 syscallarg(int) fd; 2881 syscallarg(char *) buf; 2882 syscallarg(size_t) count; 2883 } */ *uap = v; 2884 struct file *fp; 2885 int error, done; 2886 2887 /* getvnode() will use the descriptor for us */ 2888 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2889 return (error); 2890 if ((fp->f_flag & FREAD) == 0) { 2891 error = EBADF; 2892 goto out; 2893 } 2894 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2895 SCARG(uap, count), &done, p, 0, 0); 2896 *retval = done; 2897 out: 2898 FILE_UNUSE(fp, p); 2899 return (error); 2900 } 2901 2902 /* 2903 * Set the mode mask for creation of filesystem nodes. 2904 */ 2905 int 2906 sys_umask(p, v, retval) 2907 struct proc *p; 2908 void *v; 2909 register_t *retval; 2910 { 2911 struct sys_umask_args /* { 2912 syscallarg(mode_t) newmask; 2913 } */ *uap = v; 2914 struct cwdinfo *cwdi; 2915 2916 cwdi = p->p_cwdi; 2917 *retval = cwdi->cwdi_cmask; 2918 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2919 return (0); 2920 } 2921 2922 /* 2923 * Void all references to file by ripping underlying filesystem 2924 * away from vnode. 2925 */ 2926 /* ARGSUSED */ 2927 int 2928 sys_revoke(p, v, retval) 2929 struct proc *p; 2930 void *v; 2931 register_t *retval; 2932 { 2933 register struct sys_revoke_args /* { 2934 syscallarg(const char *) path; 2935 } */ *uap = v; 2936 register struct vnode *vp; 2937 struct vattr vattr; 2938 int error; 2939 struct nameidata nd; 2940 2941 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2942 if ((error = namei(&nd)) != 0) 2943 return (error); 2944 vp = nd.ni_vp; 2945 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2946 goto out; 2947 if (p->p_ucred->cr_uid != vattr.va_uid && 2948 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2949 goto out; 2950 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2951 VOP_REVOKE(vp, REVOKEALL); 2952 out: 2953 vrele(vp); 2954 return (error); 2955 } 2956 2957 /* 2958 * Convert a user file descriptor to a kernel file entry. 2959 */ 2960 int 2961 getvnode(fdp, fd, fpp) 2962 struct filedesc *fdp; 2963 int fd; 2964 struct file **fpp; 2965 { 2966 struct vnode *vp; 2967 struct file *fp; 2968 2969 if ((u_int)fd >= fdp->fd_nfiles || 2970 (fp = fdp->fd_ofiles[fd]) == NULL || 2971 (fp->f_iflags & FIF_WANTCLOSE) != 0) 2972 return (EBADF); 2973 2974 FILE_USE(fp); 2975 2976 if (fp->f_type != DTYPE_VNODE) { 2977 FILE_UNUSE(fp, NULL); 2978 return (EINVAL); 2979 } 2980 2981 vp = (struct vnode *)fp->f_data; 2982 if (vp->v_type == VBAD) { 2983 FILE_UNUSE(fp, NULL); 2984 return (EBADF); 2985 } 2986 2987 *fpp = fp; 2988 return (0); 2989 } 2990
Indexes created Mon Sep 22 10:09:38 GMT 2025