vfs_syscalls.c revision 1.138
1 /* $NetBSD: vfs_syscalls.c,v 1.138 1999/06/30 10:00:06 is 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 1839 error = VOP_ACCESS(vp, flags, cred, p); 1840 if (!error && (flags & VWRITE)) 1841 error = vn_writechk(vp); 1842 } 1843 vput(vp); 1844 out1: 1845 cred->cr_uid = t_uid; 1846 cred->cr_gid = t_gid; 1847 return (error); 1848 } 1849 1850 /* 1851 * Get file status; this version follows links. 1852 */ 1853 /* ARGSUSED */ 1854 int 1855 sys___stat13(p, v, retval) 1856 struct proc *p; 1857 void *v; 1858 register_t *retval; 1859 { 1860 register struct sys___stat13_args /* { 1861 syscallarg(const char *) path; 1862 syscallarg(struct stat *) ub; 1863 } */ *uap = v; 1864 struct stat sb; 1865 int error; 1866 struct nameidata nd; 1867 1868 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1869 SCARG(uap, path), p); 1870 if ((error = namei(&nd)) != 0) 1871 return (error); 1872 error = vn_stat(nd.ni_vp, &sb, p); 1873 vput(nd.ni_vp); 1874 if (error) 1875 return (error); 1876 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1877 return (error); 1878 } 1879 1880 /* 1881 * Get file status; this version does not follow links. 1882 */ 1883 /* ARGSUSED */ 1884 int 1885 sys___lstat13(p, v, retval) 1886 struct proc *p; 1887 void *v; 1888 register_t *retval; 1889 { 1890 register struct sys___lstat13_args /* { 1891 syscallarg(const char *) path; 1892 syscallarg(struct stat *) ub; 1893 } */ *uap = v; 1894 struct stat sb; 1895 int error; 1896 struct nameidata nd; 1897 1898 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1899 SCARG(uap, path), p); 1900 if ((error = namei(&nd)) != 0) 1901 return (error); 1902 error = vn_stat(nd.ni_vp, &sb, p); 1903 vput(nd.ni_vp); 1904 if (error) 1905 return (error); 1906 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1907 return (error); 1908 } 1909 1910 /* 1911 * Get configurable pathname variables. 1912 */ 1913 /* ARGSUSED */ 1914 int 1915 sys_pathconf(p, v, retval) 1916 struct proc *p; 1917 void *v; 1918 register_t *retval; 1919 { 1920 register struct sys_pathconf_args /* { 1921 syscallarg(const char *) path; 1922 syscallarg(int) name; 1923 } */ *uap = v; 1924 int error; 1925 struct nameidata nd; 1926 1927 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1928 SCARG(uap, path), p); 1929 if ((error = namei(&nd)) != 0) 1930 return (error); 1931 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1932 vput(nd.ni_vp); 1933 return (error); 1934 } 1935 1936 /* 1937 * Return target name of a symbolic link. 1938 */ 1939 /* ARGSUSED */ 1940 int 1941 sys_readlink(p, v, retval) 1942 struct proc *p; 1943 void *v; 1944 register_t *retval; 1945 { 1946 register struct sys_readlink_args /* { 1947 syscallarg(const char *) path; 1948 syscallarg(char *) buf; 1949 syscallarg(size_t) count; 1950 } */ *uap = v; 1951 register struct vnode *vp; 1952 struct iovec aiov; 1953 struct uio auio; 1954 int error; 1955 struct nameidata nd; 1956 1957 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1958 SCARG(uap, path), p); 1959 if ((error = namei(&nd)) != 0) 1960 return (error); 1961 vp = nd.ni_vp; 1962 if (vp->v_type != VLNK) 1963 error = EINVAL; 1964 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 1965 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 1966 aiov.iov_base = SCARG(uap, buf); 1967 aiov.iov_len = SCARG(uap, count); 1968 auio.uio_iov = &aiov; 1969 auio.uio_iovcnt = 1; 1970 auio.uio_offset = 0; 1971 auio.uio_rw = UIO_READ; 1972 auio.uio_segflg = UIO_USERSPACE; 1973 auio.uio_procp = p; 1974 auio.uio_resid = SCARG(uap, count); 1975 error = VOP_READLINK(vp, &auio, p->p_ucred); 1976 } 1977 vput(vp); 1978 *retval = SCARG(uap, count) - auio.uio_resid; 1979 return (error); 1980 } 1981 1982 /* 1983 * Change flags of a file given a path name. 1984 */ 1985 /* ARGSUSED */ 1986 int 1987 sys_chflags(p, v, retval) 1988 struct proc *p; 1989 void *v; 1990 register_t *retval; 1991 { 1992 register struct sys_chflags_args /* { 1993 syscallarg(const char *) path; 1994 syscallarg(u_long) flags; 1995 } */ *uap = v; 1996 register struct vnode *vp; 1997 struct vattr vattr; 1998 int error; 1999 struct nameidata nd; 2000 2001 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2002 if ((error = namei(&nd)) != 0) 2003 return (error); 2004 vp = nd.ni_vp; 2005 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2006 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2007 VATTR_NULL(&vattr); 2008 vattr.va_flags = SCARG(uap, flags); 2009 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2010 vput(vp); 2011 return (error); 2012 } 2013 2014 /* 2015 * Change flags of a file given a file descriptor. 2016 */ 2017 /* ARGSUSED */ 2018 int 2019 sys_fchflags(p, v, retval) 2020 struct proc *p; 2021 void *v; 2022 register_t *retval; 2023 { 2024 register struct sys_fchflags_args /* { 2025 syscallarg(int) fd; 2026 syscallarg(u_long) flags; 2027 } */ *uap = v; 2028 struct vattr vattr; 2029 struct vnode *vp; 2030 struct file *fp; 2031 int error; 2032 2033 /* getvnode() will use the descriptor for us */ 2034 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2035 return (error); 2036 vp = (struct vnode *)fp->f_data; 2037 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2038 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2039 VATTR_NULL(&vattr); 2040 vattr.va_flags = SCARG(uap, flags); 2041 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2042 VOP_UNLOCK(vp, 0); 2043 FILE_UNUSE(fp, p); 2044 return (error); 2045 } 2046 2047 /* 2048 * Change mode of a file given path name; this version follows links. 2049 */ 2050 /* ARGSUSED */ 2051 int 2052 sys_chmod(p, v, retval) 2053 struct proc *p; 2054 void *v; 2055 register_t *retval; 2056 { 2057 register struct sys_chmod_args /* { 2058 syscallarg(const char *) path; 2059 syscallarg(int) mode; 2060 } */ *uap = v; 2061 int error; 2062 struct nameidata nd; 2063 2064 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2065 if ((error = namei(&nd)) != 0) 2066 return (error); 2067 2068 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2069 2070 vrele(nd.ni_vp); 2071 return (error); 2072 } 2073 2074 /* 2075 * Change mode of a file given a file descriptor. 2076 */ 2077 /* ARGSUSED */ 2078 int 2079 sys_fchmod(p, v, retval) 2080 struct proc *p; 2081 void *v; 2082 register_t *retval; 2083 { 2084 register struct sys_fchmod_args /* { 2085 syscallarg(int) fd; 2086 syscallarg(int) mode; 2087 } */ *uap = v; 2088 struct file *fp; 2089 int error; 2090 2091 /* getvnode() will use the descriptor for us */ 2092 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2093 return (error); 2094 2095 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2096 FILE_UNUSE(fp, p); 2097 return (error); 2098 } 2099 2100 /* 2101 * Change mode of a file given path name; this version does not follow links. 2102 */ 2103 /* ARGSUSED */ 2104 int 2105 sys_lchmod(p, v, retval) 2106 struct proc *p; 2107 void *v; 2108 register_t *retval; 2109 { 2110 register struct sys_lchmod_args /* { 2111 syscallarg(const char *) path; 2112 syscallarg(int) mode; 2113 } */ *uap = v; 2114 int error; 2115 struct nameidata nd; 2116 2117 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2118 if ((error = namei(&nd)) != 0) 2119 return (error); 2120 2121 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2122 2123 vrele(nd.ni_vp); 2124 return (error); 2125 } 2126 2127 /* 2128 * Common routine to set mode given a vnode. 2129 */ 2130 static int 2131 change_mode(vp, mode, p) 2132 struct vnode *vp; 2133 int mode; 2134 struct proc *p; 2135 { 2136 struct vattr vattr; 2137 int error; 2138 2139 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2140 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2141 VATTR_NULL(&vattr); 2142 vattr.va_mode = mode & ALLPERMS; 2143 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2144 VOP_UNLOCK(vp, 0); 2145 return (error); 2146 } 2147 2148 /* 2149 * Set ownership given a path name; this version follows links. 2150 */ 2151 /* ARGSUSED */ 2152 int 2153 sys_chown(p, v, retval) 2154 struct proc *p; 2155 void *v; 2156 register_t *retval; 2157 { 2158 register struct sys_chown_args /* { 2159 syscallarg(const char *) path; 2160 syscallarg(uid_t) uid; 2161 syscallarg(gid_t) gid; 2162 } */ *uap = v; 2163 int error; 2164 struct nameidata nd; 2165 2166 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2167 if ((error = namei(&nd)) != 0) 2168 return (error); 2169 2170 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2171 2172 vrele(nd.ni_vp); 2173 return (error); 2174 } 2175 2176 /* 2177 * Set ownership given a path name; this version follows links. 2178 * Provides POSIX semantics. 2179 */ 2180 /* ARGSUSED */ 2181 int 2182 sys___posix_chown(p, v, retval) 2183 struct proc *p; 2184 void *v; 2185 register_t *retval; 2186 { 2187 register struct sys_chown_args /* { 2188 syscallarg(const char *) path; 2189 syscallarg(uid_t) uid; 2190 syscallarg(gid_t) gid; 2191 } */ *uap = v; 2192 int error; 2193 struct nameidata nd; 2194 2195 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2196 if ((error = namei(&nd)) != 0) 2197 return (error); 2198 2199 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2200 2201 vrele(nd.ni_vp); 2202 return (error); 2203 } 2204 2205 /* 2206 * Set ownership given a file descriptor. 2207 */ 2208 /* ARGSUSED */ 2209 int 2210 sys_fchown(p, v, retval) 2211 struct proc *p; 2212 void *v; 2213 register_t *retval; 2214 { 2215 register struct sys_fchown_args /* { 2216 syscallarg(int) fd; 2217 syscallarg(uid_t) uid; 2218 syscallarg(gid_t) gid; 2219 } */ *uap = v; 2220 int error; 2221 struct file *fp; 2222 2223 /* getvnode() will use the descriptor for us */ 2224 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2225 return (error); 2226 2227 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2228 SCARG(uap, gid), p, 0); 2229 FILE_UNUSE(fp, p); 2230 return (error); 2231 } 2232 2233 /* 2234 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2235 */ 2236 /* ARGSUSED */ 2237 int 2238 sys___posix_fchown(p, v, retval) 2239 struct proc *p; 2240 void *v; 2241 register_t *retval; 2242 { 2243 register struct sys_fchown_args /* { 2244 syscallarg(int) fd; 2245 syscallarg(uid_t) uid; 2246 syscallarg(gid_t) gid; 2247 } */ *uap = v; 2248 int error; 2249 struct file *fp; 2250 2251 /* getvnode() will use the descriptor for us */ 2252 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2253 return (error); 2254 2255 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2256 SCARG(uap, gid), p, 1); 2257 FILE_UNUSE(fp, p); 2258 return (error); 2259 } 2260 2261 /* 2262 * Set ownership given a path name; this version does not follow links. 2263 */ 2264 /* ARGSUSED */ 2265 int 2266 sys_lchown(p, v, retval) 2267 struct proc *p; 2268 void *v; 2269 register_t *retval; 2270 { 2271 register struct sys_lchown_args /* { 2272 syscallarg(const char *) path; 2273 syscallarg(uid_t) uid; 2274 syscallarg(gid_t) gid; 2275 } */ *uap = v; 2276 int error; 2277 struct nameidata nd; 2278 2279 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2280 if ((error = namei(&nd)) != 0) 2281 return (error); 2282 2283 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2284 2285 vrele(nd.ni_vp); 2286 return (error); 2287 } 2288 2289 /* 2290 * Set ownership given a path name; this version does not follow links. 2291 * Provides POSIX/XPG semantics. 2292 */ 2293 /* ARGSUSED */ 2294 int 2295 sys___posix_lchown(p, v, retval) 2296 struct proc *p; 2297 void *v; 2298 register_t *retval; 2299 { 2300 register struct sys_lchown_args /* { 2301 syscallarg(const char *) path; 2302 syscallarg(uid_t) uid; 2303 syscallarg(gid_t) gid; 2304 } */ *uap = v; 2305 int error; 2306 struct nameidata nd; 2307 2308 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2309 if ((error = namei(&nd)) != 0) 2310 return (error); 2311 2312 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2313 2314 vrele(nd.ni_vp); 2315 return (error); 2316 } 2317 2318 /* 2319 * Common routine to set ownership given a vnode. 2320 */ 2321 static int 2322 change_owner(vp, uid, gid, p, posix_semantics) 2323 register struct vnode *vp; 2324 uid_t uid; 2325 gid_t gid; 2326 struct proc *p; 2327 int posix_semantics; 2328 { 2329 struct vattr vattr; 2330 mode_t newmode; 2331 int error; 2332 2333 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2334 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2335 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2336 goto out; 2337 2338 #define CHANGED(x) ((x) != -1) 2339 newmode = vattr.va_mode; 2340 if (posix_semantics) { 2341 /* 2342 * POSIX/XPG semantics: if the caller is not the super-user, 2343 * clear set-user-id and set-group-id bits. Both POSIX and 2344 * the XPG consider the behaviour for calls by the super-user 2345 * implementation-defined; we leave the set-user-id and set- 2346 * group-id settings intact in that case. 2347 */ 2348 if (suser(p->p_ucred, NULL) != 0) 2349 newmode &= ~(S_ISUID | S_ISGID); 2350 } else { 2351 /* 2352 * NetBSD semantics: when changing owner and/or group, 2353 * clear the respective bit(s). 2354 */ 2355 if (CHANGED(uid)) 2356 newmode &= ~S_ISUID; 2357 if (CHANGED(gid)) 2358 newmode &= ~S_ISGID; 2359 } 2360 /* Update va_mode iff altered. */ 2361 if (vattr.va_mode == newmode) 2362 newmode = VNOVAL; 2363 2364 VATTR_NULL(&vattr); 2365 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2366 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2367 vattr.va_mode = newmode; 2368 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2369 #undef CHANGED 2370 2371 out: 2372 VOP_UNLOCK(vp, 0); 2373 return (error); 2374 } 2375 2376 /* 2377 * Set the access and modification times given a path name; this 2378 * version follows links. 2379 */ 2380 /* ARGSUSED */ 2381 int 2382 sys_utimes(p, v, retval) 2383 struct proc *p; 2384 void *v; 2385 register_t *retval; 2386 { 2387 register struct sys_utimes_args /* { 2388 syscallarg(const char *) path; 2389 syscallarg(const struct timeval *) tptr; 2390 } */ *uap = v; 2391 int error; 2392 struct nameidata nd; 2393 2394 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2395 if ((error = namei(&nd)) != 0) 2396 return (error); 2397 2398 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2399 2400 vrele(nd.ni_vp); 2401 return (error); 2402 } 2403 2404 /* 2405 * Set the access and modification times given a file descriptor. 2406 */ 2407 /* ARGSUSED */ 2408 int 2409 sys_futimes(p, v, retval) 2410 struct proc *p; 2411 void *v; 2412 register_t *retval; 2413 { 2414 register struct sys_futimes_args /* { 2415 syscallarg(int) fd; 2416 syscallarg(const struct timeval *) tptr; 2417 } */ *uap = v; 2418 int error; 2419 struct file *fp; 2420 2421 /* getvnode() will use the descriptor for us */ 2422 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2423 return (error); 2424 2425 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2426 FILE_UNUSE(fp, p); 2427 return (error); 2428 } 2429 2430 /* 2431 * Set the access and modification times given a path name; this 2432 * version does not follow links. 2433 */ 2434 /* ARGSUSED */ 2435 int 2436 sys_lutimes(p, v, retval) 2437 struct proc *p; 2438 void *v; 2439 register_t *retval; 2440 { 2441 register struct sys_lutimes_args /* { 2442 syscallarg(const char *) path; 2443 syscallarg(const struct timeval *) tptr; 2444 } */ *uap = v; 2445 int error; 2446 struct nameidata nd; 2447 2448 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2449 if ((error = namei(&nd)) != 0) 2450 return (error); 2451 2452 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2453 2454 vrele(nd.ni_vp); 2455 return (error); 2456 } 2457 2458 /* 2459 * Common routine to set access and modification times given a vnode. 2460 */ 2461 static int 2462 change_utimes(vp, tptr, p) 2463 struct vnode *vp; 2464 const struct timeval *tptr; 2465 struct proc *p; 2466 { 2467 struct timeval tv[2]; 2468 struct vattr vattr; 2469 int error; 2470 2471 VATTR_NULL(&vattr); 2472 if (tptr == NULL) { 2473 microtime(&tv[0]); 2474 tv[1] = tv[0]; 2475 vattr.va_vaflags |= VA_UTIMES_NULL; 2476 } else { 2477 error = copyin(tptr, tv, sizeof(tv)); 2478 if (error) 2479 return (error); 2480 } 2481 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2482 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2483 vattr.va_atime.tv_sec = tv[0].tv_sec; 2484 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2485 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2486 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2487 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2488 VOP_UNLOCK(vp, 0); 2489 return (error); 2490 } 2491 2492 /* 2493 * Truncate a file given its path name. 2494 */ 2495 /* ARGSUSED */ 2496 int 2497 sys_truncate(p, v, retval) 2498 struct proc *p; 2499 void *v; 2500 register_t *retval; 2501 { 2502 register struct sys_truncate_args /* { 2503 syscallarg(const char *) path; 2504 syscallarg(int) pad; 2505 syscallarg(off_t) length; 2506 } */ *uap = v; 2507 register struct vnode *vp; 2508 struct vattr vattr; 2509 int error; 2510 struct nameidata nd; 2511 2512 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2513 if ((error = namei(&nd)) != 0) 2514 return (error); 2515 vp = nd.ni_vp; 2516 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2517 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2518 if (vp->v_type == VDIR) 2519 error = EISDIR; 2520 else if ((error = vn_writechk(vp)) == 0 && 2521 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2522 VATTR_NULL(&vattr); 2523 vattr.va_size = SCARG(uap, length); 2524 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2525 } 2526 vput(vp); 2527 return (error); 2528 } 2529 2530 /* 2531 * Truncate a file given a file descriptor. 2532 */ 2533 /* ARGSUSED */ 2534 int 2535 sys_ftruncate(p, v, retval) 2536 struct proc *p; 2537 void *v; 2538 register_t *retval; 2539 { 2540 register struct sys_ftruncate_args /* { 2541 syscallarg(int) fd; 2542 syscallarg(int) pad; 2543 syscallarg(off_t) length; 2544 } */ *uap = v; 2545 struct vattr vattr; 2546 struct vnode *vp; 2547 struct file *fp; 2548 int error; 2549 2550 /* getvnode() will use the descriptor for us */ 2551 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2552 return (error); 2553 if ((fp->f_flag & FWRITE) == 0) { 2554 error = EINVAL; 2555 goto out; 2556 } 2557 vp = (struct vnode *)fp->f_data; 2558 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2559 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2560 if (vp->v_type == VDIR) 2561 error = EISDIR; 2562 else if ((error = vn_writechk(vp)) == 0) { 2563 VATTR_NULL(&vattr); 2564 vattr.va_size = SCARG(uap, length); 2565 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2566 } 2567 VOP_UNLOCK(vp, 0); 2568 out: 2569 FILE_UNUSE(fp, p); 2570 return (error); 2571 } 2572 2573 /* 2574 * Sync an open file. 2575 */ 2576 /* ARGSUSED */ 2577 int 2578 sys_fsync(p, v, retval) 2579 struct proc *p; 2580 void *v; 2581 register_t *retval; 2582 { 2583 struct sys_fsync_args /* { 2584 syscallarg(int) fd; 2585 } */ *uap = v; 2586 register struct vnode *vp; 2587 struct file *fp; 2588 int error; 2589 2590 /* getvnode() will use the descriptor for us */ 2591 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2592 return (error); 2593 vp = (struct vnode *)fp->f_data; 2594 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2595 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2596 VOP_UNLOCK(vp, 0); 2597 FILE_UNUSE(fp, p); 2598 return (error); 2599 } 2600 2601 /* 2602 * Sync the data of an open file. 2603 */ 2604 /* ARGSUSED */ 2605 int 2606 sys_fdatasync(p, v, retval) 2607 struct proc *p; 2608 void *v; 2609 register_t *retval; 2610 { 2611 struct sys_fdatasync_args /* { 2612 syscallarg(int) fd; 2613 } */ *uap = v; 2614 struct vnode *vp; 2615 struct file *fp; 2616 int error; 2617 2618 /* getvnode() will use the descriptor for us */ 2619 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2620 return (error); 2621 vp = (struct vnode *)fp->f_data; 2622 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2623 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2624 VOP_UNLOCK(vp, 0); 2625 FILE_UNUSE(fp, p); 2626 return (error); 2627 } 2628 2629 /* 2630 * Rename files, (standard) BSD semantics frontend. 2631 */ 2632 /* ARGSUSED */ 2633 int 2634 sys_rename(p, v, retval) 2635 struct proc *p; 2636 void *v; 2637 register_t *retval; 2638 { 2639 register struct sys_rename_args /* { 2640 syscallarg(const char *) from; 2641 syscallarg(const char *) to; 2642 } */ *uap = v; 2643 2644 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2645 } 2646 2647 /* 2648 * Rename files, POSIX semantics frontend. 2649 */ 2650 /* ARGSUSED */ 2651 int 2652 sys___posix_rename(p, v, retval) 2653 struct proc *p; 2654 void *v; 2655 register_t *retval; 2656 { 2657 register struct sys___posix_rename_args /* { 2658 syscallarg(const char *) from; 2659 syscallarg(const char *) to; 2660 } */ *uap = v; 2661 2662 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2663 } 2664 2665 /* 2666 * Rename files. Source and destination must either both be directories, 2667 * or both not be directories. If target is a directory, it must be empty. 2668 * If `from' and `to' refer to the same object, the value of the `retain' 2669 * argument is used to determine whether `from' will be 2670 * 2671 * (retain == 0) deleted unless `from' and `to' refer to the same 2672 * object in the file system's name space (BSD). 2673 * (retain == 1) always retained (POSIX). 2674 */ 2675 static int 2676 rename_files(from, to, p, retain) 2677 const char *from, *to; 2678 struct proc *p; 2679 int retain; 2680 { 2681 register struct vnode *tvp, *fvp, *tdvp; 2682 struct nameidata fromnd, tond; 2683 int error; 2684 2685 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2686 from, p); 2687 if ((error = namei(&fromnd)) != 0) 2688 return (error); 2689 fvp = fromnd.ni_vp; 2690 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2691 UIO_USERSPACE, to, p); 2692 if ((error = namei(&tond)) != 0) { 2693 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2694 vrele(fromnd.ni_dvp); 2695 vrele(fvp); 2696 goto out1; 2697 } 2698 tdvp = tond.ni_dvp; 2699 tvp = tond.ni_vp; 2700 2701 if (tvp != NULL) { 2702 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2703 error = ENOTDIR; 2704 goto out; 2705 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2706 error = EISDIR; 2707 goto out; 2708 } 2709 } 2710 2711 if (fvp == tdvp) 2712 error = EINVAL; 2713 2714 /* 2715 * Source and destination refer to the same object. 2716 */ 2717 if (fvp == tvp) { 2718 if (retain) 2719 error = -1; 2720 else if (fromnd.ni_dvp == tdvp && 2721 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2722 !memcmp(fromnd.ni_cnd.cn_nameptr, 2723 tond.ni_cnd.cn_nameptr, 2724 fromnd.ni_cnd.cn_namelen)) 2725 error = -1; 2726 } 2727 2728 out: 2729 if (!error) { 2730 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2731 if (fromnd.ni_dvp != tdvp) 2732 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2733 if (tvp) { 2734 (void)uvm_vnp_uncache(tvp); 2735 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2736 } 2737 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2738 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2739 } else { 2740 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2741 if (tdvp == tvp) 2742 vrele(tdvp); 2743 else 2744 vput(tdvp); 2745 if (tvp) 2746 vput(tvp); 2747 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2748 vrele(fromnd.ni_dvp); 2749 vrele(fvp); 2750 } 2751 vrele(tond.ni_startdir); 2752 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2753 out1: 2754 if (fromnd.ni_startdir) 2755 vrele(fromnd.ni_startdir); 2756 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2757 return (error == -1 ? 0 : error); 2758 } 2759 2760 /* 2761 * Make a directory file. 2762 */ 2763 /* ARGSUSED */ 2764 int 2765 sys_mkdir(p, v, retval) 2766 struct proc *p; 2767 void *v; 2768 register_t *retval; 2769 { 2770 register struct sys_mkdir_args /* { 2771 syscallarg(const char *) path; 2772 syscallarg(int) mode; 2773 } */ *uap = v; 2774 register struct vnode *vp; 2775 struct vattr vattr; 2776 int error; 2777 struct nameidata nd; 2778 2779 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2780 if ((error = namei(&nd)) != 0) 2781 return (error); 2782 vp = nd.ni_vp; 2783 if (vp != NULL) { 2784 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2785 if (nd.ni_dvp == vp) 2786 vrele(nd.ni_dvp); 2787 else 2788 vput(nd.ni_dvp); 2789 vrele(vp); 2790 return (EEXIST); 2791 } 2792 VATTR_NULL(&vattr); 2793 vattr.va_type = VDIR; 2794 vattr.va_mode = 2795 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2796 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2797 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2798 if (!error) 2799 vput(nd.ni_vp); 2800 return (error); 2801 } 2802 2803 /* 2804 * Remove a directory file. 2805 */ 2806 /* ARGSUSED */ 2807 int 2808 sys_rmdir(p, v, retval) 2809 struct proc *p; 2810 void *v; 2811 register_t *retval; 2812 { 2813 struct sys_rmdir_args /* { 2814 syscallarg(const char *) path; 2815 } */ *uap = v; 2816 register struct vnode *vp; 2817 int error; 2818 struct nameidata nd; 2819 2820 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2821 SCARG(uap, path), p); 2822 if ((error = namei(&nd)) != 0) 2823 return (error); 2824 vp = nd.ni_vp; 2825 if (vp->v_type != VDIR) { 2826 error = ENOTDIR; 2827 goto out; 2828 } 2829 /* 2830 * No rmdir "." please. 2831 */ 2832 if (nd.ni_dvp == vp) { 2833 error = EINVAL; 2834 goto out; 2835 } 2836 /* 2837 * The root of a mounted filesystem cannot be deleted. 2838 */ 2839 if (vp->v_flag & VROOT) 2840 error = EBUSY; 2841 out: 2842 if (!error) { 2843 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2844 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2845 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2846 } else { 2847 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2848 if (nd.ni_dvp == vp) 2849 vrele(nd.ni_dvp); 2850 else 2851 vput(nd.ni_dvp); 2852 vput(vp); 2853 } 2854 return (error); 2855 } 2856 2857 /* 2858 * Read a block of directory entries in a file system independent format. 2859 */ 2860 int 2861 sys_getdents(p, v, retval) 2862 struct proc *p; 2863 void *v; 2864 register_t *retval; 2865 { 2866 register struct sys_getdents_args /* { 2867 syscallarg(int) fd; 2868 syscallarg(char *) buf; 2869 syscallarg(size_t) count; 2870 } */ *uap = v; 2871 struct file *fp; 2872 int error, done; 2873 2874 /* getvnode() will use the descriptor for us */ 2875 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2876 return (error); 2877 if ((fp->f_flag & FREAD) == 0) { 2878 error = EBADF; 2879 goto out; 2880 } 2881 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2882 SCARG(uap, count), &done, p, 0, 0); 2883 *retval = done; 2884 out: 2885 FILE_UNUSE(fp, p); 2886 return (error); 2887 } 2888 2889 /* 2890 * Set the mode mask for creation of filesystem nodes. 2891 */ 2892 int 2893 sys_umask(p, v, retval) 2894 struct proc *p; 2895 void *v; 2896 register_t *retval; 2897 { 2898 struct sys_umask_args /* { 2899 syscallarg(mode_t) newmask; 2900 } */ *uap = v; 2901 struct cwdinfo *cwdi; 2902 2903 cwdi = p->p_cwdi; 2904 *retval = cwdi->cwdi_cmask; 2905 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2906 return (0); 2907 } 2908 2909 /* 2910 * Void all references to file by ripping underlying filesystem 2911 * away from vnode. 2912 */ 2913 /* ARGSUSED */ 2914 int 2915 sys_revoke(p, v, retval) 2916 struct proc *p; 2917 void *v; 2918 register_t *retval; 2919 { 2920 register struct sys_revoke_args /* { 2921 syscallarg(const char *) path; 2922 } */ *uap = v; 2923 register struct vnode *vp; 2924 struct vattr vattr; 2925 int error; 2926 struct nameidata nd; 2927 2928 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2929 if ((error = namei(&nd)) != 0) 2930 return (error); 2931 vp = nd.ni_vp; 2932 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2933 goto out; 2934 if (p->p_ucred->cr_uid != vattr.va_uid && 2935 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 2936 goto out; 2937 if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) 2938 VOP_REVOKE(vp, REVOKEALL); 2939 out: 2940 vrele(vp); 2941 return (error); 2942 } 2943 2944 /* 2945 * Convert a user file descriptor to a kernel file entry. 2946 */ 2947 int 2948 getvnode(fdp, fd, fpp) 2949 struct filedesc *fdp; 2950 int fd; 2951 struct file **fpp; 2952 { 2953 struct vnode *vp; 2954 struct file *fp; 2955 2956 if ((u_int)fd >= fdp->fd_nfiles || 2957 (fp = fdp->fd_ofiles[fd]) == NULL || 2958 (fp->f_iflags & FIF_WANTCLOSE) != 0) 2959 return (EBADF); 2960 2961 FILE_USE(fp); 2962 2963 if (fp->f_type != DTYPE_VNODE) { 2964 FILE_UNUSE(fp, NULL); 2965 return (EINVAL); 2966 } 2967 2968 vp = (struct vnode *)fp->f_data; 2969 if (vp->v_type == VBAD) { 2970 FILE_UNUSE(fp, NULL); 2971 return (EBADF); 2972 } 2973 2974 *fpp = fp; 2975 return (0); 2976 } 2977
Indexes created Fri Sep 26 20:09:58 GMT 2025