vfs_syscalls.c revision 1.137
1 /* $NetBSD: vfs_syscalls.c,v 1.137 1999/06/29 22:18:47 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; 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 if ((error = falloc(p, &nfp, &indx)) != 0) 1084 return (error); 1085 fp = nfp; 1086 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1087 return (error); 1088 1089 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1090 return (ESTALE); 1091 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1092 return (error); 1093 1094 /* Now do an effective vn_open */ 1095 1096 if (vp->v_type == VSOCK) { 1097 error = EOPNOTSUPP; 1098 goto bad; 1099 } 1100 if (flags & FREAD) { 1101 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1102 goto bad; 1103 } 1104 if (flags & (FWRITE | O_TRUNC)) { 1105 if (vp->v_type == VDIR) { 1106 error = EISDIR; 1107 goto bad; 1108 } 1109 if ((error = vn_writechk(vp)) != 0 || 1110 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1111 goto bad; 1112 } 1113 if (flags & O_TRUNC) { 1114 VOP_UNLOCK(vp, 0); /* XXX */ 1115 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1116 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1117 VATTR_NULL(&va); 1118 va.va_size = 0; 1119 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1120 goto bad; 1121 } 1122 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1123 goto bad; 1124 if (flags & FWRITE) 1125 vp->v_writecount++; 1126 1127 /* done with modified vn_open, now finish what sys_open does. */ 1128 1129 fp->f_flag = flags & FMASK; 1130 fp->f_type = DTYPE_VNODE; 1131 fp->f_ops = &vnops; 1132 fp->f_data = (caddr_t)vp; 1133 if (flags & (O_EXLOCK | O_SHLOCK)) { 1134 lf.l_whence = SEEK_SET; 1135 lf.l_start = 0; 1136 lf.l_len = 0; 1137 if (flags & O_EXLOCK) 1138 lf.l_type = F_WRLCK; 1139 else 1140 lf.l_type = F_RDLCK; 1141 type = F_FLOCK; 1142 if ((flags & FNONBLOCK) == 0) 1143 type |= F_WAIT; 1144 VOP_UNLOCK(vp, 0); 1145 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1146 if (error) { 1147 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1148 ffree(fp); 1149 fdp->fd_ofiles[indx] = NULL; 1150 return (error); 1151 } 1152 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1153 fp->f_flag |= FHASLOCK; 1154 } 1155 VOP_UNLOCK(vp, 0); 1156 *retval = indx; 1157 return (0); 1158 bad: 1159 vput(vp); 1160 return (error); 1161 } 1162 1163 /* ARGSUSED */ 1164 int 1165 sys_fhstat(p, v, retval) 1166 struct proc *p; 1167 void *v; 1168 register_t *retval; 1169 { 1170 register struct sys_fhstat_args /* { 1171 syscallarg(const fhandle_t *) fhp; 1172 syscallarg(struct stat *) sb; 1173 } */ *uap = v; 1174 struct stat sb; 1175 int error; 1176 fhandle_t fh; 1177 struct mount *mp; 1178 struct vnode *vp; 1179 1180 /* 1181 * Must be super user 1182 */ 1183 if ((error = suser(p->p_ucred, &p->p_acflag))) 1184 return (error); 1185 1186 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1187 return (error); 1188 1189 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1190 return (ESTALE); 1191 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1192 return (error); 1193 error = vn_stat(vp, &sb, p); 1194 vput(vp); 1195 if (error) 1196 return (error); 1197 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1198 return (error); 1199 } 1200 1201 /* ARGSUSED */ 1202 int 1203 sys_fhstatfs(p, v, retval) 1204 struct proc *p; 1205 void *v; 1206 register_t *retval; 1207 { 1208 register struct sys_fhstatfs_args /* 1209 syscallarg(const fhandle_t *) fhp; 1210 syscallarg(struct statfs *) buf; 1211 } */ *uap = v; 1212 struct statfs sp; 1213 fhandle_t fh; 1214 struct mount *mp; 1215 struct vnode *vp; 1216 int error; 1217 1218 /* 1219 * Must be super user 1220 */ 1221 if ((error = suser(p->p_ucred, &p->p_acflag))) 1222 return (error); 1223 1224 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1225 return (error); 1226 1227 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1228 return (ESTALE); 1229 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1230 return (error); 1231 mp = vp->v_mount; 1232 vput(vp); 1233 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1234 return (error); 1235 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1236 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1237 } 1238 1239 /* 1240 * Create a special file. 1241 */ 1242 /* ARGSUSED */ 1243 int 1244 sys_mknod(p, v, retval) 1245 struct proc *p; 1246 void *v; 1247 register_t *retval; 1248 { 1249 register struct sys_mknod_args /* { 1250 syscallarg(const char *) path; 1251 syscallarg(int) mode; 1252 syscallarg(int) dev; 1253 } */ *uap = v; 1254 register struct vnode *vp; 1255 struct vattr vattr; 1256 int error; 1257 int whiteout = 0; 1258 struct nameidata nd; 1259 1260 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1261 return (error); 1262 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1263 if ((error = namei(&nd)) != 0) 1264 return (error); 1265 vp = nd.ni_vp; 1266 if (vp != NULL) 1267 error = EEXIST; 1268 else { 1269 VATTR_NULL(&vattr); 1270 vattr.va_mode = 1271 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1272 vattr.va_rdev = SCARG(uap, dev); 1273 whiteout = 0; 1274 1275 switch (SCARG(uap, mode) & S_IFMT) { 1276 case S_IFMT: /* used by badsect to flag bad sectors */ 1277 vattr.va_type = VBAD; 1278 break; 1279 case S_IFCHR: 1280 vattr.va_type = VCHR; 1281 break; 1282 case S_IFBLK: 1283 vattr.va_type = VBLK; 1284 break; 1285 case S_IFWHT: 1286 whiteout = 1; 1287 break; 1288 default: 1289 error = EINVAL; 1290 break; 1291 } 1292 } 1293 if (!error) { 1294 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1295 if (whiteout) { 1296 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1297 if (error) 1298 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1299 vput(nd.ni_dvp); 1300 } else { 1301 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1302 &nd.ni_cnd, &vattr); 1303 } 1304 } else { 1305 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1306 if (nd.ni_dvp == vp) 1307 vrele(nd.ni_dvp); 1308 else 1309 vput(nd.ni_dvp); 1310 if (vp) 1311 vrele(vp); 1312 } 1313 return (error); 1314 } 1315 1316 /* 1317 * Create a named pipe. 1318 */ 1319 /* ARGSUSED */ 1320 int 1321 sys_mkfifo(p, v, retval) 1322 struct proc *p; 1323 void *v; 1324 register_t *retval; 1325 { 1326 register struct sys_mkfifo_args /* { 1327 syscallarg(const char *) path; 1328 syscallarg(int) mode; 1329 } */ *uap = v; 1330 struct vattr vattr; 1331 int error; 1332 struct nameidata nd; 1333 1334 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1335 if ((error = namei(&nd)) != 0) 1336 return (error); 1337 if (nd.ni_vp != NULL) { 1338 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1339 if (nd.ni_dvp == nd.ni_vp) 1340 vrele(nd.ni_dvp); 1341 else 1342 vput(nd.ni_dvp); 1343 vrele(nd.ni_vp); 1344 return (EEXIST); 1345 } 1346 VATTR_NULL(&vattr); 1347 vattr.va_type = VFIFO; 1348 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1349 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1350 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1351 } 1352 1353 /* 1354 * Make a hard file link. 1355 */ 1356 /* ARGSUSED */ 1357 int 1358 sys_link(p, v, retval) 1359 struct proc *p; 1360 void *v; 1361 register_t *retval; 1362 { 1363 register struct sys_link_args /* { 1364 syscallarg(const char *) path; 1365 syscallarg(const char *) link; 1366 } */ *uap = v; 1367 register struct vnode *vp; 1368 struct nameidata nd; 1369 int error; 1370 1371 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1372 if ((error = namei(&nd)) != 0) 1373 return (error); 1374 vp = nd.ni_vp; 1375 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1376 if ((error = namei(&nd)) != 0) 1377 goto out; 1378 if (nd.ni_vp) { 1379 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1380 if (nd.ni_dvp == nd.ni_vp) 1381 vrele(nd.ni_dvp); 1382 else 1383 vput(nd.ni_dvp); 1384 vrele(nd.ni_vp); 1385 error = EEXIST; 1386 goto out; 1387 } 1388 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1389 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1390 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1391 out: 1392 vrele(vp); 1393 return (error); 1394 } 1395 1396 /* 1397 * Make a symbolic link. 1398 */ 1399 /* ARGSUSED */ 1400 int 1401 sys_symlink(p, v, retval) 1402 struct proc *p; 1403 void *v; 1404 register_t *retval; 1405 { 1406 register struct sys_symlink_args /* { 1407 syscallarg(const char *) path; 1408 syscallarg(const char *) link; 1409 } */ *uap = v; 1410 struct vattr vattr; 1411 char *path; 1412 int error; 1413 struct nameidata nd; 1414 1415 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1416 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1417 if (error) 1418 goto out; 1419 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1420 if ((error = namei(&nd)) != 0) 1421 goto out; 1422 if (nd.ni_vp) { 1423 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1424 if (nd.ni_dvp == nd.ni_vp) 1425 vrele(nd.ni_dvp); 1426 else 1427 vput(nd.ni_dvp); 1428 vrele(nd.ni_vp); 1429 error = EEXIST; 1430 goto out; 1431 } 1432 VATTR_NULL(&vattr); 1433 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1434 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1435 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1436 out: 1437 FREE(path, M_NAMEI); 1438 return (error); 1439 } 1440 1441 /* 1442 * Delete a whiteout from the filesystem. 1443 */ 1444 /* ARGSUSED */ 1445 int 1446 sys_undelete(p, v, retval) 1447 struct proc *p; 1448 void *v; 1449 register_t *retval; 1450 { 1451 register struct sys_undelete_args /* { 1452 syscallarg(const char *) path; 1453 } */ *uap = v; 1454 int error; 1455 struct nameidata nd; 1456 1457 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1458 SCARG(uap, path), p); 1459 error = namei(&nd); 1460 if (error) 1461 return (error); 1462 1463 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1464 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1465 if (nd.ni_dvp == nd.ni_vp) 1466 vrele(nd.ni_dvp); 1467 else 1468 vput(nd.ni_dvp); 1469 if (nd.ni_vp) 1470 vrele(nd.ni_vp); 1471 return (EEXIST); 1472 } 1473 1474 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1475 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1476 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1477 vput(nd.ni_dvp); 1478 return (error); 1479 } 1480 1481 /* 1482 * Delete a name from the filesystem. 1483 */ 1484 /* ARGSUSED */ 1485 int 1486 sys_unlink(p, v, retval) 1487 struct proc *p; 1488 void *v; 1489 register_t *retval; 1490 { 1491 struct sys_unlink_args /* { 1492 syscallarg(const char *) path; 1493 } */ *uap = v; 1494 register struct vnode *vp; 1495 int error; 1496 struct nameidata nd; 1497 1498 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1499 SCARG(uap, path), p); 1500 if ((error = namei(&nd)) != 0) 1501 return (error); 1502 vp = nd.ni_vp; 1503 1504 /* 1505 * The root of a mounted filesystem cannot be deleted. 1506 */ 1507 if (vp->v_flag & VROOT) { 1508 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1509 if (nd.ni_dvp == vp) 1510 vrele(nd.ni_dvp); 1511 else 1512 vput(nd.ni_dvp); 1513 vput(vp); 1514 error = EBUSY; 1515 goto out; 1516 } 1517 1518 (void)uvm_vnp_uncache(vp); 1519 1520 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1521 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1522 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1523 out: 1524 return (error); 1525 } 1526 1527 /* 1528 * Reposition read/write file offset. 1529 */ 1530 int 1531 sys_lseek(p, v, retval) 1532 struct proc *p; 1533 void *v; 1534 register_t *retval; 1535 { 1536 register struct sys_lseek_args /* { 1537 syscallarg(int) fd; 1538 syscallarg(int) pad; 1539 syscallarg(off_t) offset; 1540 syscallarg(int) whence; 1541 } */ *uap = v; 1542 struct ucred *cred = p->p_ucred; 1543 register struct filedesc *fdp = p->p_fd; 1544 register struct file *fp; 1545 struct vnode *vp; 1546 struct vattr vattr; 1547 register off_t newoff; 1548 int error; 1549 1550 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1551 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1552 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1553 return (EBADF); 1554 1555 FILE_USE(fp); 1556 1557 vp = (struct vnode *)fp->f_data; 1558 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1559 error = ESPIPE; 1560 goto out; 1561 } 1562 1563 switch (SCARG(uap, whence)) { 1564 case SEEK_CUR: 1565 newoff = fp->f_offset + SCARG(uap, offset); 1566 break; 1567 case SEEK_END: 1568 error = VOP_GETATTR(vp, &vattr, cred, p); 1569 if (error) 1570 goto out; 1571 newoff = SCARG(uap, offset) + vattr.va_size; 1572 break; 1573 case SEEK_SET: 1574 newoff = SCARG(uap, offset); 1575 break; 1576 default: 1577 error = EINVAL; 1578 goto out; 1579 } 1580 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1581 goto out; 1582 1583 *(off_t *)retval = fp->f_offset = newoff; 1584 out: 1585 FILE_UNUSE(fp, p); 1586 return (error); 1587 } 1588 1589 /* 1590 * Positional read system call. 1591 */ 1592 int 1593 sys_pread(p, v, retval) 1594 struct proc *p; 1595 void *v; 1596 register_t *retval; 1597 { 1598 struct sys_pread_args /* { 1599 syscallarg(int) fd; 1600 syscallarg(void *) buf; 1601 syscallarg(size_t) nbyte; 1602 syscallarg(off_t) offset; 1603 } */ *uap = v; 1604 struct filedesc *fdp = p->p_fd; 1605 struct file *fp; 1606 struct vnode *vp; 1607 off_t offset; 1608 int error, fd = SCARG(uap, fd); 1609 1610 if ((u_int)fd >= fdp->fd_nfiles || 1611 (fp = fdp->fd_ofiles[fd]) == NULL || 1612 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1613 (fp->f_flag & FREAD) == 0) 1614 return (EBADF); 1615 1616 FILE_USE(fp); 1617 1618 vp = (struct vnode *)fp->f_data; 1619 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1620 error = ESPIPE; 1621 goto out; 1622 } 1623 1624 offset = SCARG(uap, offset); 1625 1626 /* 1627 * XXX This works because no file systems actually 1628 * XXX take any action on the seek operation. 1629 */ 1630 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1631 goto out; 1632 1633 /* dofileread() will unuse the descriptor for us */ 1634 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1635 &offset, 0, retval)); 1636 1637 out: 1638 FILE_UNUSE(fp, p); 1639 return (error); 1640 } 1641 1642 /* 1643 * Positional scatter read system call. 1644 */ 1645 int 1646 sys_preadv(p, v, retval) 1647 struct proc *p; 1648 void *v; 1649 register_t *retval; 1650 { 1651 struct sys_preadv_args /* { 1652 syscallarg(int) fd; 1653 syscallarg(const struct iovec *) iovp; 1654 syscallarg(int) iovcnt; 1655 syscallarg(off_t) offset; 1656 } */ *uap = v; 1657 struct filedesc *fdp = p->p_fd; 1658 struct file *fp; 1659 struct vnode *vp; 1660 off_t offset; 1661 int error, fd = SCARG(uap, fd); 1662 1663 if ((u_int)fd >= fdp->fd_nfiles || 1664 (fp = fdp->fd_ofiles[fd]) == NULL || 1665 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1666 (fp->f_flag & FREAD) == 0) 1667 return (EBADF); 1668 1669 FILE_USE(fp); 1670 1671 vp = (struct vnode *)fp->f_data; 1672 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1673 error = ESPIPE; 1674 goto out; 1675 } 1676 1677 offset = SCARG(uap, offset); 1678 1679 /* 1680 * XXX This works because no file systems actually 1681 * XXX take any action on the seek operation. 1682 */ 1683 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1684 goto out; 1685 1686 /* dofilereadv() will unuse the descriptor for us */ 1687 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1688 &offset, 0, retval)); 1689 1690 out: 1691 FILE_UNUSE(fp, p); 1692 return (error); 1693 } 1694 1695 /* 1696 * Positional write system call. 1697 */ 1698 int 1699 sys_pwrite(p, v, retval) 1700 struct proc *p; 1701 void *v; 1702 register_t *retval; 1703 { 1704 struct sys_pwrite_args /* { 1705 syscallarg(int) fd; 1706 syscallarg(const void *) buf; 1707 syscallarg(size_t) nbyte; 1708 syscallarg(off_t) offset; 1709 } */ *uap = v; 1710 struct filedesc *fdp = p->p_fd; 1711 struct file *fp; 1712 struct vnode *vp; 1713 off_t offset; 1714 int error, fd = SCARG(uap, fd); 1715 1716 if ((u_int)fd >= fdp->fd_nfiles || 1717 (fp = fdp->fd_ofiles[fd]) == NULL || 1718 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1719 (fp->f_flag & FWRITE) == 0) 1720 return (EBADF); 1721 1722 FILE_USE(fp); 1723 1724 vp = (struct vnode *)fp->f_data; 1725 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1726 error = ESPIPE; 1727 goto out; 1728 } 1729 1730 offset = SCARG(uap, offset); 1731 1732 /* 1733 * XXX This works because no file systems actually 1734 * XXX take any action on the seek operation. 1735 */ 1736 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1737 goto out; 1738 1739 /* dofilewrite() will unuse the descriptor for us */ 1740 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1741 &offset, 0, retval)); 1742 1743 out: 1744 FILE_UNUSE(fp, p); 1745 return (error); 1746 } 1747 1748 /* 1749 * Positional gather write system call. 1750 */ 1751 int 1752 sys_pwritev(p, v, retval) 1753 struct proc *p; 1754 void *v; 1755 register_t *retval; 1756 { 1757 struct sys_pwritev_args /* { 1758 syscallarg(int) fd; 1759 syscallarg(const struct iovec *) iovp; 1760 syscallarg(int) iovcnt; 1761 syscallarg(off_t) offset; 1762 } */ *uap = v; 1763 struct filedesc *fdp = p->p_fd; 1764 struct file *fp; 1765 struct vnode *vp; 1766 off_t offset; 1767 int error, fd = SCARG(uap, fd); 1768 1769 if ((u_int)fd >= fdp->fd_nfiles || 1770 (fp = fdp->fd_ofiles[fd]) == NULL || 1771 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1772 (fp->f_flag & FWRITE) == 0) 1773 return (EBADF); 1774 1775 FILE_USE(fp); 1776 1777 vp = (struct vnode *)fp->f_data; 1778 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1779 error = ESPIPE; 1780 goto out; 1781 } 1782 1783 offset = SCARG(uap, offset); 1784 1785 /* 1786 * XXX This works because no file systems actually 1787 * XXX take any action on the seek operation. 1788 */ 1789 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1790 goto out; 1791 1792 /* dofilewritev() will unuse the descriptor for us */ 1793 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1794 &offset, 0, retval)); 1795 1796 out: 1797 FILE_UNUSE(fp, p); 1798 return (error); 1799 } 1800 1801 /* 1802 * Check access permissions. 1803 */ 1804 int 1805 sys_access(p, v, retval) 1806 struct proc *p; 1807 void *v; 1808 register_t *retval; 1809 { 1810 register struct sys_access_args /* { 1811 syscallarg(const char *) path; 1812 syscallarg(int) flags; 1813 } */ *uap = v; 1814 register struct ucred *cred = p->p_ucred; 1815 register struct vnode *vp; 1816 int error, flags, t_gid, t_uid; 1817 struct nameidata nd; 1818 1819 t_uid = cred->cr_uid; 1820 t_gid = cred->cr_gid; 1821 cred->cr_uid = p->p_cred->p_ruid; 1822 cred->cr_gid = p->p_cred->p_rgid; 1823 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1824 SCARG(uap, path), p); 1825 if ((error = namei(&nd)) != 0) 1826 goto out1; 1827 vp = nd.ni_vp; 1828 1829 /* Flags == 0 means only check for existence. */ 1830 if (SCARG(uap, flags)) { 1831 flags = 0; 1832 if (SCARG(uap, flags) & R_OK) 1833 flags |= VREAD; 1834 if (SCARG(uap, flags) & W_OK) 1835 flags |= VWRITE; 1836 if (SCARG(uap, flags) & X_OK) 1837 flags |= VEXEC; 1838 if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1839 error = VOP_ACCESS(vp, flags, cred, p); 1840 } 1841 vput(vp); 1842 out1: 1843 cred->cr_uid = t_uid; 1844 cred->cr_gid = t_gid; 1845 return (error); 1846 } 1847 1848 /* 1849 * Get file status; this version follows links. 1850 */ 1851 /* ARGSUSED */ 1852 int 1853 sys___stat13(p, v, retval) 1854 struct proc *p; 1855 void *v; 1856 register_t *retval; 1857 { 1858 register struct sys___stat13_args /* { 1859 syscallarg(const char *) path; 1860 syscallarg(struct stat *) ub; 1861 } */ *uap = v; 1862 struct stat sb; 1863 int error; 1864 struct nameidata nd; 1865 1866 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1867 SCARG(uap, path), p); 1868 if ((error = namei(&nd)) != 0) 1869 return (error); 1870 error = vn_stat(nd.ni_vp, &sb, p); 1871 vput(nd.ni_vp); 1872 if (error) 1873 return (error); 1874 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1875 return (error); 1876 } 1877 1878 /* 1879 * Get file status; this version does not follow links. 1880 */ 1881 /* ARGSUSED */ 1882 int 1883 sys___lstat13(p, v, retval) 1884 struct proc *p; 1885 void *v; 1886 register_t *retval; 1887 { 1888 register struct sys___lstat13_args /* { 1889 syscallarg(const char *) path; 1890 syscallarg(struct stat *) ub; 1891 } */ *uap = v; 1892 struct stat sb; 1893 int error; 1894 struct nameidata nd; 1895 1896 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1897 SCARG(uap, path), p); 1898 if ((error = namei(&nd)) != 0) 1899 return (error); 1900 error = vn_stat(nd.ni_vp, &sb, p); 1901 vput(nd.ni_vp); 1902 if (error) 1903 return (error); 1904 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1905 return (error); 1906 } 1907 1908 /* 1909 * Get configurable pathname variables. 1910 */ 1911 /* ARGSUSED */ 1912 int 1913 sys_pathconf(p, v, retval) 1914 struct proc *p; 1915 void *v; 1916 register_t *retval; 1917 { 1918 register struct sys_pathconf_args /* { 1919 syscallarg(const char *) path; 1920 syscallarg(int) name; 1921 } */ *uap = v; 1922 int error; 1923 struct nameidata nd; 1924 1925 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1926 SCARG(uap, path), p); 1927 if ((error = namei(&nd)) != 0) 1928 return (error); 1929 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1930 vput(nd.ni_vp); 1931 return (error); 1932 } 1933 1934 /* 1935 * Return target name of a symbolic link. 1936 */ 1937 /* ARGSUSED */ 1938 int 1939 sys_readlink(p, v, retval) 1940 struct proc *p; 1941 void *v; 1942 register_t *retval; 1943 { 1944 register struct sys_readlink_args /* { 1945 syscallarg(const char *) path; 1946 syscallarg(char *) buf; 1947 syscallarg(size_t) count; 1948 } */ *uap = v; 1949 register struct vnode *vp; 1950 struct iovec aiov; 1951 struct uio auio; 1952 int error; 1953 struct nameidata nd; 1954 1955 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1956 SCARG(uap, path), p); 1957 if ((error = namei(&nd)) != 0) 1958 return (error); 1959 vp = nd.ni_vp; 1960 if (vp->v_type != VLNK) 1961 error = EINVAL; 1962 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1963 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1964 aiov.iov_base = SCARG(uap, buf); 1965 aiov.iov_len = SCARG(uap, count); 1966 auio.uio_iov = &aiov; 1967 auio.uio_iovcnt = 1; 1968 auio.uio_offset = 0; 1969 auio.uio_rw = UIO_READ; 1970 auio.uio_segflg = UIO_USERSPACE; 1971 auio.uio_procp = p; 1972 auio.uio_resid = SCARG(uap, count); 1973 error = VOP_READLINK(vp, &auio, p->p_ucred); 1974 } 1975 vput(vp); 1976 *retval = SCARG(uap, count) - auio.uio_resid; 1977 return (error); 1978 } 1979 1980 /* 1981 * Change flags of a file given a path name. 1982 */ 1983 /* ARGSUSED */ 1984 int 1985 sys_chflags(p, v, retval) 1986 struct proc *p; 1987 void *v; 1988 register_t *retval; 1989 { 1990 register struct sys_chflags_args /* { 1991 syscallarg(const char *) path; 1992 syscallarg(u_long) flags; 1993 } */ *uap = v; 1994 register struct vnode *vp; 1995 struct vattr vattr; 1996 int error; 1997 struct nameidata nd; 1998 1999 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2000 if ((error = namei(&nd)) != 0) 2001 return (error); 2002 vp = nd.ni_vp; 2003 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2004 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2005 VATTR_NULL(&vattr); 2006 vattr.va_flags = SCARG(uap, flags); 2007 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2008 vput(vp); 2009 return (error); 2010 } 2011 2012 /* 2013 * Change flags of a file given a file descriptor. 2014 */ 2015 /* ARGSUSED */ 2016 int 2017 sys_fchflags(p, v, retval) 2018 struct proc *p; 2019 void *v; 2020 register_t *retval; 2021 { 2022 register struct sys_fchflags_args /* { 2023 syscallarg(int) fd; 2024 syscallarg(u_long) flags; 2025 } */ *uap = v; 2026 struct vattr vattr; 2027 struct vnode *vp; 2028 struct file *fp; 2029 int error; 2030 2031 /* getvnode() will use the descriptor for us */ 2032 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2033 return (error); 2034 vp = (struct vnode *)fp->f_data; 2035 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2036 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2037 VATTR_NULL(&vattr); 2038 vattr.va_flags = SCARG(uap, flags); 2039 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2040 VOP_UNLOCK(vp, 0); 2041 FILE_UNUSE(fp, p); 2042 return (error); 2043 } 2044 2045 /* 2046 * Change mode of a file given path name; this version follows links. 2047 */ 2048 /* ARGSUSED */ 2049 int 2050 sys_chmod(p, v, retval) 2051 struct proc *p; 2052 void *v; 2053 register_t *retval; 2054 { 2055 register struct sys_chmod_args /* { 2056 syscallarg(const char *) path; 2057 syscallarg(int) mode; 2058 } */ *uap = v; 2059 int error; 2060 struct nameidata nd; 2061 2062 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2063 if ((error = namei(&nd)) != 0) 2064 return (error); 2065 2066 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2067 2068 vrele(nd.ni_vp); 2069 return (error); 2070 } 2071 2072 /* 2073 * Change mode of a file given a file descriptor. 2074 */ 2075 /* ARGSUSED */ 2076 int 2077 sys_fchmod(p, v, retval) 2078 struct proc *p; 2079 void *v; 2080 register_t *retval; 2081 { 2082 register struct sys_fchmod_args /* { 2083 syscallarg(int) fd; 2084 syscallarg(int) mode; 2085 } */ *uap = v; 2086 struct file *fp; 2087 int error; 2088 2089 /* getvnode() will use the descriptor for us */ 2090 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2091 return (error); 2092 2093 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2094 FILE_UNUSE(fp, p); 2095 return (error); 2096 } 2097 2098 /* 2099 * Change mode of a file given path name; this version does not follow links. 2100 */ 2101 /* ARGSUSED */ 2102 int 2103 sys_lchmod(p, v, retval) 2104 struct proc *p; 2105 void *v; 2106 register_t *retval; 2107 { 2108 register struct sys_lchmod_args /* { 2109 syscallarg(const char *) path; 2110 syscallarg(int) mode; 2111 } */ *uap = v; 2112 int error; 2113 struct nameidata nd; 2114 2115 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2116 if ((error = namei(&nd)) != 0) 2117 return (error); 2118 2119 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2120 2121 vrele(nd.ni_vp); 2122 return (error); 2123 } 2124 2125 /* 2126 * Common routine to set mode given a vnode. 2127 */ 2128 static int 2129 change_mode(vp, mode, p) 2130 struct vnode *vp; 2131 int mode; 2132 struct proc *p; 2133 { 2134 struct vattr vattr; 2135 int error; 2136 2137 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2138 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2139 VATTR_NULL(&vattr); 2140 vattr.va_mode = mode & ALLPERMS; 2141 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2142 VOP_UNLOCK(vp, 0); 2143 return (error); 2144 } 2145 2146 /* 2147 * Set ownership given a path name; this version follows links. 2148 */ 2149 /* ARGSUSED */ 2150 int 2151 sys_chown(p, v, retval) 2152 struct proc *p; 2153 void *v; 2154 register_t *retval; 2155 { 2156 register struct sys_chown_args /* { 2157 syscallarg(const char *) path; 2158 syscallarg(uid_t) uid; 2159 syscallarg(gid_t) gid; 2160 } */ *uap = v; 2161 int error; 2162 struct nameidata nd; 2163 2164 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2165 if ((error = namei(&nd)) != 0) 2166 return (error); 2167 2168 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2169 2170 vrele(nd.ni_vp); 2171 return (error); 2172 } 2173 2174 /* 2175 * Set ownership given a path name; this version follows links. 2176 * Provides POSIX semantics. 2177 */ 2178 /* ARGSUSED */ 2179 int 2180 sys___posix_chown(p, v, retval) 2181 struct proc *p; 2182 void *v; 2183 register_t *retval; 2184 { 2185 register struct sys_chown_args /* { 2186 syscallarg(const char *) path; 2187 syscallarg(uid_t) uid; 2188 syscallarg(gid_t) gid; 2189 } */ *uap = v; 2190 int error; 2191 struct nameidata nd; 2192 2193 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2194 if ((error = namei(&nd)) != 0) 2195 return (error); 2196 2197 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2198 2199 vrele(nd.ni_vp); 2200 return (error); 2201 } 2202 2203 /* 2204 * Set ownership given a file descriptor. 2205 */ 2206 /* ARGSUSED */ 2207 int 2208 sys_fchown(p, v, retval) 2209 struct proc *p; 2210 void *v; 2211 register_t *retval; 2212 { 2213 register struct sys_fchown_args /* { 2214 syscallarg(int) fd; 2215 syscallarg(uid_t) uid; 2216 syscallarg(gid_t) gid; 2217 } */ *uap = v; 2218 int error; 2219 struct file *fp; 2220 2221 /* getvnode() will use the descriptor for us */ 2222 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2223 return (error); 2224 2225 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2226 SCARG(uap, gid), p, 0); 2227 FILE_UNUSE(fp, p); 2228 return (error); 2229 } 2230 2231 /* 2232 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2233 */ 2234 /* ARGSUSED */ 2235 int 2236 sys___posix_fchown(p, v, retval) 2237 struct proc *p; 2238 void *v; 2239 register_t *retval; 2240 { 2241 register struct sys_fchown_args /* { 2242 syscallarg(int) fd; 2243 syscallarg(uid_t) uid; 2244 syscallarg(gid_t) gid; 2245 } */ *uap = v; 2246 int error; 2247 struct file *fp; 2248 2249 /* getvnode() will use the descriptor for us */ 2250 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2251 return (error); 2252 2253 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2254 SCARG(uap, gid), p, 1); 2255 FILE_UNUSE(fp, p); 2256 return (error); 2257 } 2258 2259 /* 2260 * Set ownership given a path name; this version does not follow links. 2261 */ 2262 /* ARGSUSED */ 2263 int 2264 sys_lchown(p, v, retval) 2265 struct proc *p; 2266 void *v; 2267 register_t *retval; 2268 { 2269 register struct sys_lchown_args /* { 2270 syscallarg(const char *) path; 2271 syscallarg(uid_t) uid; 2272 syscallarg(gid_t) gid; 2273 } */ *uap = v; 2274 int error; 2275 struct nameidata nd; 2276 2277 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2278 if ((error = namei(&nd)) != 0) 2279 return (error); 2280 2281 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2282 2283 vrele(nd.ni_vp); 2284 return (error); 2285 } 2286 2287 /* 2288 * Set ownership given a path name; this version does not follow links. 2289 * Provides POSIX/XPG semantics. 2290 */ 2291 /* ARGSUSED */ 2292 int 2293 sys___posix_lchown(p, v, retval) 2294 struct proc *p; 2295 void *v; 2296 register_t *retval; 2297 { 2298 register struct sys_lchown_args /* { 2299 syscallarg(const char *) path; 2300 syscallarg(uid_t) uid; 2301 syscallarg(gid_t) gid; 2302 } */ *uap = v; 2303 int error; 2304 struct nameidata nd; 2305 2306 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2307 if ((error = namei(&nd)) != 0) 2308 return (error); 2309 2310 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2311 2312 vrele(nd.ni_vp); 2313 return (error); 2314 } 2315 2316 /* 2317 * Common routine to set ownership given a vnode. 2318 */ 2319 static int 2320 change_owner(vp, uid, gid, p, posix_semantics) 2321 register struct vnode *vp; 2322 uid_t uid; 2323 gid_t gid; 2324 struct proc *p; 2325 int posix_semantics; 2326 { 2327 struct vattr vattr; 2328 mode_t newmode; 2329 int error; 2330 2331 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2332 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2333 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2334 goto out; 2335 2336 #define CHANGED(x) ((x) != -1) 2337 newmode = vattr.va_mode; 2338 if (posix_semantics) { 2339 /* 2340 * POSIX/XPG semantics: if the caller is not the super-user, 2341 * clear set-user-id and set-group-id bits. Both POSIX and 2342 * the XPG consider the behaviour for calls by the super-user 2343 * implementation-defined; we leave the set-user-id and set- 2344 * group-id settings intact in that case. 2345 */ 2346 if (suser(p->p_ucred, NULL) != 0) 2347 newmode &= ~(S_ISUID | S_ISGID); 2348 } else { 2349 /* 2350 * NetBSD semantics: when changing owner and/or group, 2351 * clear the respective bit(s). 2352 */ 2353 if (CHANGED(uid)) 2354 newmode &= ~S_ISUID; 2355 if (CHANGED(gid)) 2356 newmode &= ~S_ISGID; 2357 } 2358 /* Update va_mode iff altered. */ 2359 if (vattr.va_mode == newmode) 2360 newmode = VNOVAL; 2361 2362 VATTR_NULL(&vattr); 2363 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2364 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2365 vattr.va_mode = newmode; 2366 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2367 #undef CHANGED 2368 2369 out: 2370 VOP_UNLOCK(vp, 0); 2371 return (error); 2372 } 2373 2374 /* 2375 * Set the access and modification times given a path name; this 2376 * version follows links. 2377 */ 2378 /* ARGSUSED */ 2379 int 2380 sys_utimes(p, v, retval) 2381 struct proc *p; 2382 void *v; 2383 register_t *retval; 2384 { 2385 register struct sys_utimes_args /* { 2386 syscallarg(const char *) path; 2387 syscallarg(const struct timeval *) tptr; 2388 } */ *uap = v; 2389 int error; 2390 struct nameidata nd; 2391 2392 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2393 if ((error = namei(&nd)) != 0) 2394 return (error); 2395 2396 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2397 2398 vrele(nd.ni_vp); 2399 return (error); 2400 } 2401 2402 /* 2403 * Set the access and modification times given a file descriptor. 2404 */ 2405 /* ARGSUSED */ 2406 int 2407 sys_futimes(p, v, retval) 2408 struct proc *p; 2409 void *v; 2410 register_t *retval; 2411 { 2412 register struct sys_futimes_args /* { 2413 syscallarg(int) fd; 2414 syscallarg(const struct timeval *) tptr; 2415 } */ *uap = v; 2416 int error; 2417 struct file *fp; 2418 2419 /* getvnode() will use the descriptor for us */ 2420 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2421 return (error); 2422 2423 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2424 FILE_UNUSE(fp, p); 2425 return (error); 2426 } 2427 2428 /* 2429 * Set the access and modification times given a path name; this 2430 * version does not follow links. 2431 */ 2432 /* ARGSUSED */ 2433 int 2434 sys_lutimes(p, v, retval) 2435 struct proc *p; 2436 void *v; 2437 register_t *retval; 2438 { 2439 register struct sys_lutimes_args /* { 2440 syscallarg(const char *) path; 2441 syscallarg(const struct timeval *) tptr; 2442 } */ *uap = v; 2443 int error; 2444 struct nameidata nd; 2445 2446 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2447 if ((error = namei(&nd)) != 0) 2448 return (error); 2449 2450 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2451 2452 vrele(nd.ni_vp); 2453 return (error); 2454 } 2455 2456 /* 2457 * Common routine to set access and modification times given a vnode. 2458 */ 2459 static int 2460 change_utimes(vp, tptr, p) 2461 struct vnode *vp; 2462 const struct timeval *tptr; 2463 struct proc *p; 2464 { 2465 struct timeval tv[2]; 2466 struct vattr vattr; 2467 int error; 2468 2469 VATTR_NULL(&vattr); 2470 if (tptr == NULL) { 2471 microtime(&tv[0]); 2472 tv[1] = tv[0]; 2473 vattr.va_vaflags |= VA_UTIMES_NULL; 2474 } else { 2475 error = copyin(tptr, tv, sizeof(tv)); 2476 if (error) 2477 return (error); 2478 } 2479 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2480 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2481 vattr.va_atime.tv_sec = tv[0].tv_sec; 2482 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2483 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2484 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2485 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2486 VOP_UNLOCK(vp, 0); 2487 return (error); 2488 } 2489 2490 /* 2491 * Truncate a file given its path name. 2492 */ 2493 /* ARGSUSED */ 2494 int 2495 sys_truncate(p, v, retval) 2496 struct proc *p; 2497 void *v; 2498 register_t *retval; 2499 { 2500 register struct sys_truncate_args /* { 2501 syscallarg(const char *) path; 2502 syscallarg(int) pad; 2503 syscallarg(off_t) length; 2504 } */ *uap = v; 2505 register struct vnode *vp; 2506 struct vattr vattr; 2507 int error; 2508 struct nameidata nd; 2509 2510 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2511 if ((error = namei(&nd)) != 0) 2512 return (error); 2513 vp = nd.ni_vp; 2514 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2515 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2516 if (vp->v_type == VDIR) 2517 error = EISDIR; 2518 else if ((error = vn_writechk(vp)) == 0 && 2519 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2520 VATTR_NULL(&vattr); 2521 vattr.va_size = SCARG(uap, length); 2522 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2523 } 2524 vput(vp); 2525 return (error); 2526 } 2527 2528 /* 2529 * Truncate a file given a file descriptor. 2530 */ 2531 /* ARGSUSED */ 2532 int 2533 sys_ftruncate(p, v, retval) 2534 struct proc *p; 2535 void *v; 2536 register_t *retval; 2537 { 2538 register struct sys_ftruncate_args /* { 2539 syscallarg(int) fd; 2540 syscallarg(int) pad; 2541 syscallarg(off_t) length; 2542 } */ *uap = v; 2543 struct vattr vattr; 2544 struct vnode *vp; 2545 struct file *fp; 2546 int error; 2547 2548 /* getvnode() will use the descriptor for us */ 2549 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2550 return (error); 2551 if ((fp->f_flag & FWRITE) == 0) { 2552 error = EINVAL; 2553 goto out; 2554 } 2555 vp = (struct vnode *)fp->f_data; 2556 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2557 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2558 if (vp->v_type == VDIR) 2559 error = EISDIR; 2560 else if ((error = vn_writechk(vp)) == 0) { 2561 VATTR_NULL(&vattr); 2562 vattr.va_size = SCARG(uap, length); 2563 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2564 } 2565 VOP_UNLOCK(vp, 0); 2566 out: 2567 FILE_UNUSE(fp, p); 2568 return (error); 2569 } 2570 2571 /* 2572 * Sync an open file. 2573 */ 2574 /* ARGSUSED */ 2575 int 2576 sys_fsync(p, v, retval) 2577 struct proc *p; 2578 void *v; 2579 register_t *retval; 2580 { 2581 struct sys_fsync_args /* { 2582 syscallarg(int) fd; 2583 } */ *uap = v; 2584 register struct vnode *vp; 2585 struct file *fp; 2586 int error; 2587 2588 /* getvnode() will use the descriptor for us */ 2589 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2590 return (error); 2591 vp = (struct vnode *)fp->f_data; 2592 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2593 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2594 VOP_UNLOCK(vp, 0); 2595 FILE_UNUSE(fp, p); 2596 return (error); 2597 } 2598 2599 /* 2600 * Sync the data of an open file. 2601 */ 2602 /* ARGSUSED */ 2603 int 2604 sys_fdatasync(p, v, retval) 2605 struct proc *p; 2606 void *v; 2607 register_t *retval; 2608 { 2609 struct sys_fdatasync_args /* { 2610 syscallarg(int) fd; 2611 } */ *uap = v; 2612 struct vnode *vp; 2613 struct file *fp; 2614 int error; 2615 2616 /* getvnode() will use the descriptor for us */ 2617 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2618 return (error); 2619 vp = (struct vnode *)fp->f_data; 2620 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2621 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2622 VOP_UNLOCK(vp, 0); 2623 FILE_UNUSE(fp, p); 2624 return (error); 2625 } 2626 2627 /* 2628 * Rename files, (standard) BSD semantics frontend. 2629 */ 2630 /* ARGSUSED */ 2631 int 2632 sys_rename(p, v, retval) 2633 struct proc *p; 2634 void *v; 2635 register_t *retval; 2636 { 2637 register struct sys_rename_args /* { 2638 syscallarg(const char *) from; 2639 syscallarg(const char *) to; 2640 } */ *uap = v; 2641 2642 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2643 } 2644 2645 /* 2646 * Rename files, POSIX semantics frontend. 2647 */ 2648 /* ARGSUSED */ 2649 int 2650 sys___posix_rename(p, v, retval) 2651 struct proc *p; 2652 void *v; 2653 register_t *retval; 2654 { 2655 register struct sys___posix_rename_args /* { 2656 syscallarg(const char *) from; 2657 syscallarg(const char *) to; 2658 } */ *uap = v; 2659 2660 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2661 } 2662 2663 /* 2664 * Rename files. Source and destination must either both be directories, 2665 * or both not be directories. If target is a directory, it must be empty. 2666 * If `from' and `to' refer to the same object, the value of the `retain' 2667 * argument is used to determine whether `from' will be 2668 * 2669 * (retain == 0) deleted unless `from' and `to' refer to the same 2670 * object in the file system's name space (BSD). 2671 * (retain == 1) always retained (POSIX). 2672 */ 2673 static int 2674 rename_files(from, to, p, retain) 2675 const char *from, *to; 2676 struct proc *p; 2677 int retain; 2678 { 2679 register struct vnode *tvp, *fvp, *tdvp; 2680 struct nameidata fromnd, tond; 2681 int error; 2682 2683 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2684 from, p); 2685 if ((error = namei(&fromnd)) != 0) 2686 return (error); 2687 fvp = fromnd.ni_vp; 2688 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2689 UIO_USERSPACE, to, p); 2690 if ((error = namei(&tond)) != 0) { 2691 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2692 vrele(fromnd.ni_dvp); 2693 vrele(fvp); 2694 goto out1; 2695 } 2696 tdvp = tond.ni_dvp; 2697 tvp = tond.ni_vp; 2698 2699 if (tvp != NULL) { 2700 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2701 error = ENOTDIR; 2702 goto out; 2703 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2704 error = EISDIR; 2705 goto out; 2706 } 2707 } 2708 2709 if (fvp == tdvp) 2710 error = EINVAL; 2711 2712 /* 2713 * Source and destination refer to the same object. 2714 */ 2715 if (fvp == tvp) { 2716 if (retain) 2717 error = -1; 2718 else if (fromnd.ni_dvp == tdvp && 2719 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2720 !memcmp(fromnd.ni_cnd.cn_nameptr, 2721 tond.ni_cnd.cn_nameptr, 2722 fromnd.ni_cnd.cn_namelen)) 2723 error = -1; 2724 } 2725 2726 out: 2727 if (!error) { 2728 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2729 if (fromnd.ni_dvp != tdvp) 2730 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2731 if (tvp) { 2732 (void)uvm_vnp_uncache(tvp); 2733 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2734 } 2735 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2736 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2737 } else { 2738 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2739 if (tdvp == tvp) 2740 vrele(tdvp); 2741 else 2742 vput(tdvp); 2743 if (tvp) 2744 vput(tvp); 2745 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2746 vrele(fromnd.ni_dvp); 2747 vrele(fvp); 2748 } 2749 vrele(tond.ni_startdir); 2750 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2751 out1: 2752 if (fromnd.ni_startdir) 2753 vrele(fromnd.ni_startdir); 2754 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2755 return (error == -1 ? 0 : error); 2756 } 2757 2758 /* 2759 * Make a directory file. 2760 */ 2761 /* ARGSUSED */ 2762 int 2763 sys_mkdir(p, v, retval) 2764 struct proc *p; 2765 void *v; 2766 register_t *retval; 2767 { 2768 register struct sys_mkdir_args /* { 2769 syscallarg(const char *) path; 2770 syscallarg(int) mode; 2771 } */ *uap = v; 2772 register struct vnode *vp; 2773 struct vattr vattr; 2774 int error; 2775 struct nameidata nd; 2776 2777 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2778 if ((error = namei(&nd)) != 0) 2779 return (error); 2780 vp = nd.ni_vp; 2781 if (vp != NULL) { 2782 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2783 if (nd.ni_dvp == vp) 2784 vrele(nd.ni_dvp); 2785 else 2786 vput(nd.ni_dvp); 2787 vrele(vp); 2788 return (EEXIST); 2789 } 2790 VATTR_NULL(&vattr); 2791 vattr.va_type = VDIR; 2792 vattr.va_mode = 2793 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2794 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2795 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2796 if (!error) 2797 vput(nd.ni_vp); 2798 return (error); 2799 } 2800 2801 /* 2802 * Remove a directory file. 2803 */ 2804 /* ARGSUSED */ 2805 int 2806 sys_rmdir(p, v, retval) 2807 struct proc *p; 2808 void *v; 2809 register_t *retval; 2810 { 2811 struct sys_rmdir_args /* { 2812 syscallarg(const char *) path; 2813 } */ *uap = v; 2814 register struct vnode *vp; 2815 int error; 2816 struct nameidata nd; 2817 2818 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2819 SCARG(uap, path), p); 2820 if ((error = namei(&nd)) != 0) 2821 return (error); 2822 vp = nd.ni_vp; 2823 if (vp->v_type != VDIR) { 2824 error = ENOTDIR; 2825 goto out; 2826 } 2827 /* 2828 * No rmdir "." please. 2829 */ 2830 if (nd.ni_dvp == vp) { 2831 error = EINVAL; 2832 goto out; 2833 } 2834 /* 2835 * The root of a mounted filesystem cannot be deleted. 2836 */ 2837 if (vp->v_flag & VROOT) 2838 error = EBUSY; 2839 out: 2840 if (!error) { 2841 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2842 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2843 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2844 } else { 2845 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2846 if (nd.ni_dvp == vp) 2847 vrele(nd.ni_dvp); 2848 else 2849 vput(nd.ni_dvp); 2850 vput(vp); 2851 } 2852 return (error); 2853 } 2854 2855 /* 2856 * Read a block of directory entries in a file system independent format. 2857 */ 2858 int 2859 sys_getdents(p, v, retval) 2860 struct proc *p; 2861 void *v; 2862 register_t *retval; 2863 { 2864 register struct sys_getdents_args /* { 2865 syscallarg(int) fd; 2866 syscallarg(char *) buf; 2867 syscallarg(size_t) count; 2868 } */ *uap = v; 2869 struct file *fp; 2870 int error, done; 2871 2872 /* getvnode() will use the descriptor for us */ 2873 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2874 return (error); 2875 if ((fp->f_flag & FREAD) == 0) { 2876 error = EBADF; 2877 goto out; 2878 } 2879 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2880 SCARG(uap, count), &done, p, 0, 0); 2881 *retval = done; 2882 out: 2883 FILE_UNUSE(fp, p); 2884 return (error); 2885 } 2886 2887 /* 2888 * Set the mode mask for creation of filesystem nodes. 2889 */ 2890 int 2891 sys_umask(p, v, retval) 2892 struct proc *p; 2893 void *v; 2894 register_t *retval; 2895 { 2896 struct sys_umask_args /* { 2897 syscallarg(mode_t) newmask; 2898 } */ *uap = v; 2899 struct cwdinfo *cwdi; 2900 2901 cwdi = p->p_cwdi; 2902 *retval = cwdi->cwdi_cmask; 2903 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2904 return (0); 2905 } 2906 2907 /* 2908 * Void all references to file by ripping underlying filesystem 2909 * away from vnode. 2910 */ 2911 /* ARGSUSED */ 2912 int 2913 sys_revoke(p, v, retval) 2914 struct proc *p; 2915 void *v; 2916 register_t *retval; 2917 { 2918 register struct sys_revoke_args /* { 2919 syscallarg(const char *) path; 2920 } */ *uap = v; 2921 register struct vnode *vp; 2922 struct vattr vattr; 2923 int error; 2924 struct nameidata nd; 2925 2926 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2927 if ((error = namei(&nd)) != 0) 2928 return (error); 2929 vp = nd.ni_vp; 2930 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2931 goto out; 2932 if (p->p_ucred->cr_uid != vattr.va_uid && 2933 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2934 goto out; 2935 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2936 VOP_REVOKE(vp, REVOKEALL); 2937 out: 2938 vrele(vp); 2939 return (error); 2940 } 2941 2942 /* 2943 * Convert a user file descriptor to a kernel file entry. 2944 */ 2945 int 2946 getvnode(fdp, fd, fpp) 2947 struct filedesc *fdp; 2948 int fd; 2949 struct file **fpp; 2950 { 2951 struct vnode *vp; 2952 struct file *fp; 2953 2954 if ((u_int)fd >= fdp->fd_nfiles || 2955 (fp = fdp->fd_ofiles[fd]) == NULL || 2956 (fp->f_iflags & FIF_WANTCLOSE) != 0) 2957 return (EBADF); 2958 2959 FILE_USE(fp); 2960 2961 if (fp->f_type != DTYPE_VNODE) { 2962 FILE_UNUSE(fp, NULL); 2963 return (EINVAL); 2964 } 2965 2966 vp = (struct vnode *)fp->f_data; 2967 if (vp->v_type == VBAD) { 2968 FILE_UNUSE(fp, NULL); 2969 return (EBADF); 2970 } 2971 2972 *fpp = fp; 2973 return (0); 2974 } 2975
Indexes created Tue Sep 23 22:09:46 GMT 2025