vfs_syscalls.c revision 1.147.4.1
1 /* $NetBSD: vfs_syscalls.c,v 1.147.4.1 1999/10/19 12:50:08 fvdl 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 <miscfs/genfs/genfs.h> 66 #include <miscfs/syncfs/syncfs.h> 67 68 #include <uvm/uvm_extern.h> 69 70 static int change_dir __P((struct nameidata *, struct proc *)); 71 static int change_mode __P((struct vnode *, int, struct proc *p)); 72 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 73 int)); 74 static int change_utimes __P((struct vnode *vp, const struct timeval *, 75 struct proc *p)); 76 static int rename_files __P((const char *, const char *, struct proc *, int)); 77 78 void checkdirs __P((struct vnode *)); 79 int dounmount __P((struct mount *, int, struct proc *)); 80 81 /* 82 * Virtual File System System Calls 83 */ 84 85 /* 86 * Mount a file system. 87 */ 88 89 /* 90 * This table is used to maintain compatibility with 4.3BSD 91 * and NetBSD 0.9 mount syscalls. Note, the order is important! 92 * 93 * Also note that not all of these had actual numbers in 4.3BSD 94 * or NetBSD 0.9! 95 */ 96 const char *mountcompatnames[] = { 97 NULL, /* 0 = MOUNT_NONE */ 98 MOUNT_FFS, /* 1 */ 99 MOUNT_NFS, /* 2 */ 100 MOUNT_MFS, /* 3 */ 101 MOUNT_MSDOS, /* 4 */ 102 MOUNT_LFS, /* 5 */ 103 NULL, /* 6 = MOUNT_LOFS */ 104 MOUNT_FDESC, /* 7 */ 105 MOUNT_PORTAL, /* 8 */ 106 MOUNT_NULL, /* 9 */ 107 MOUNT_UMAP, /* 10 */ 108 MOUNT_KERNFS, /* 11 */ 109 MOUNT_PROCFS, /* 12 */ 110 MOUNT_AFS, /* 13 */ 111 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 112 MOUNT_UNION, /* 15 */ 113 MOUNT_ADOSFS, /* 16 */ 114 MOUNT_EXT2FS, /* 17 */ 115 MOUNT_CODA, /* 18 */ 116 MOUNT_FILECORE, /* 19 */ 117 MOUNT_NTFS, /* 20 */ 118 }; 119 const int nmountcompatnames = sizeof(mountcompatnames) / 120 sizeof(mountcompatnames[0]); 121 122 /* ARGSUSED */ 123 int 124 sys_mount(p, v, retval) 125 struct proc *p; 126 void *v; 127 register_t *retval; 128 { 129 register struct sys_mount_args /* { 130 syscallarg(const char *) type; 131 syscallarg(const char *) path; 132 syscallarg(int) flags; 133 syscallarg(void *) data; 134 } */ *uap = v; 135 struct vnode *vp; 136 struct mount *mp; 137 int error, flag = 0; 138 char fstypename[MFSNAMELEN]; 139 struct vattr va; 140 struct nameidata nd; 141 struct vfsops *vfs; 142 143 /* 144 * Get vnode to be covered 145 */ 146 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 147 SCARG(uap, path), p); 148 if ((error = namei(&nd)) != 0) 149 return (error); 150 vp = nd.ni_vp; 151 /* 152 * A lookup in VFS_MOUNT might result in an attempt to 153 * lock this vnode again, so make the lock resursive. 154 */ 155 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 156 if (SCARG(uap, flags) & MNT_UPDATE) { 157 if ((vp->v_flag & VROOT) == 0) { 158 vput(vp); 159 return (EINVAL); 160 } 161 mp = vp->v_mount; 162 flag = mp->mnt_flag; 163 vfs = mp->mnt_op; 164 /* 165 * We only allow the filesystem to be reloaded if it 166 * is currently mounted read-only. 167 */ 168 if ((SCARG(uap, flags) & MNT_RELOAD) && 169 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 170 vput(vp); 171 return (EOPNOTSUPP); /* Needs translation */ 172 } 173 /* 174 * In "highly secure" mode, don't let the caller do anything 175 * but downgrade a filesystem from read-write to read-only. 176 * (see also below; MNT_UPDATE is required.) 177 */ 178 if (securelevel >= 2 && 179 (SCARG(uap, flags) != 180 (mp->mnt_flag | MNT_RDONLY | 181 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 182 vput(vp); 183 return (EPERM); 184 } 185 mp->mnt_flag |= 186 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 187 /* 188 * Only root, or the user that did the original mount is 189 * permitted to update it. 190 */ 191 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 192 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 193 vput(vp); 194 return (error); 195 } 196 /* 197 * Do not allow NFS export by non-root users. For non-root 198 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 199 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 200 */ 201 if (p->p_ucred->cr_uid != 0) { 202 if (SCARG(uap, flags) & MNT_EXPORTED) { 203 vput(vp); 204 return (EPERM); 205 } 206 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 207 if (flag & MNT_NOEXEC) 208 SCARG(uap, flags) |= MNT_NOEXEC; 209 } 210 if (vfs_busy(mp, LK_NOWAIT, 0)) { 211 vput(vp); 212 return (EPERM); 213 } 214 VOP_UNLOCK(vp, 0); 215 goto update; 216 } else { 217 if (securelevel >= 2) 218 return (EPERM); 219 } 220 /* 221 * If the user is not root, ensure that they own the directory 222 * onto which we are attempting to mount. 223 */ 224 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 225 (va.va_uid != p->p_ucred->cr_uid && 226 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 227 vput(vp); 228 return (error); 229 } 230 /* 231 * Do not allow NFS export by non-root users. For non-root users, 232 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 233 * mount point is already MNT_NOEXEC. 234 */ 235 if (p->p_ucred->cr_uid != 0) { 236 if (SCARG(uap, flags) & MNT_EXPORTED) { 237 vput(vp); 238 return (EPERM); 239 } 240 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 241 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 242 SCARG(uap, flags) |= MNT_NOEXEC; 243 } 244 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 245 return (error); 246 if (vp->v_type != VDIR) { 247 vput(vp); 248 return (ENOTDIR); 249 } 250 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 251 if (error) { 252 #if defined(COMPAT_09) || defined(COMPAT_43) 253 /* 254 * Historically filesystem types were identified by number. 255 * If we get an integer for the filesystem type instead of a 256 * string, we check to see if it matches one of the historic 257 * filesystem types. 258 */ 259 u_long fsindex = (u_long)SCARG(uap, type); 260 if (fsindex >= nmountcompatnames || 261 mountcompatnames[fsindex] == NULL) { 262 vput(vp); 263 return (ENODEV); 264 } 265 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 266 #else 267 vput(vp); 268 return (error); 269 #endif 270 } 271 #ifdef COMPAT_10 272 /* Accept `ufs' as an alias for `ffs'. */ 273 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 274 strncpy(fstypename, "ffs", MFSNAMELEN); 275 #endif 276 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 277 vput(vp); 278 return (ENODEV); 279 } 280 if (vp->v_mountedhere != NULL) { 281 vput(vp); 282 return (EBUSY); 283 } 284 285 /* 286 * Allocate and initialize the file system. 287 */ 288 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 289 M_MOUNT, M_WAITOK); 290 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 291 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 292 (void)vfs_busy(mp, LK_NOWAIT, 0); 293 mp->mnt_op = vfs; 294 vfs->vfs_refcount++; 295 mp->mnt_vnodecovered = vp; 296 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 297 update: 298 /* 299 * Set the mount level flags. 300 */ 301 if (SCARG(uap, flags) & MNT_RDONLY) 302 mp->mnt_flag |= MNT_RDONLY; 303 else if (mp->mnt_flag & MNT_RDONLY) 304 mp->mnt_flag |= MNT_WANTRDWR; 305 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 306 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 307 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 308 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 309 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 310 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 311 /* 312 * Mount the filesystem. 313 */ 314 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 315 if (mp->mnt_flag & MNT_UPDATE) { 316 vrele(vp); 317 if (mp->mnt_flag & MNT_WANTRDWR) 318 mp->mnt_flag &= ~MNT_RDONLY; 319 mp->mnt_flag &=~ 320 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 321 if (error) 322 mp->mnt_flag = flag; 323 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 324 if (mp->mnt_syncer == NULL) 325 error = vfs_allocate_syncvnode(mp); 326 } else { 327 if (mp->mnt_syncer != NULL) 328 vgone(mp->mnt_syncer); 329 mp->mnt_syncer = NULL; 330 } 331 vfs_unbusy(mp); 332 return (error); 333 } 334 /* 335 * Put the new filesystem on the mount list after root. 336 */ 337 cache_purge(vp); 338 if (!error) { 339 vp->v_mountedhere = mp; 340 simple_lock(&mountlist_slock); 341 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 342 simple_unlock(&mountlist_slock); 343 checkdirs(vp); 344 VOP_UNLOCK(vp, 0); 345 if ((mp->mnt_flag & MNT_RDONLY) == 0) 346 error = vfs_allocate_syncvnode(mp); 347 vfs_unbusy(mp); 348 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 349 if ((error = VFS_START(mp, 0, p))) 350 vrele(vp); 351 } else { 352 vp->v_mountedhere = (struct mount *)0; 353 vfs->vfs_refcount--; 354 vfs_unbusy(mp); 355 free((caddr_t)mp, M_MOUNT); 356 vput(vp); 357 } 358 return (error); 359 } 360 361 /* 362 * Scan all active processes to see if any of them have a current 363 * or root directory onto which the new filesystem has just been 364 * mounted. If so, replace them with the new mount point. 365 */ 366 void 367 checkdirs(olddp) 368 struct vnode *olddp; 369 { 370 struct cwdinfo *cwdi; 371 struct vnode *newdp; 372 struct proc *p; 373 374 if (olddp->v_usecount == 1) 375 return; 376 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 377 panic("mount: lost mount"); 378 proclist_lock_read(); 379 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 380 cwdi = p->p_cwdi; 381 if (cwdi->cwdi_cdir == olddp) { 382 vrele(cwdi->cwdi_cdir); 383 VREF(newdp); 384 cwdi->cwdi_cdir = newdp; 385 } 386 if (cwdi->cwdi_rdir == olddp) { 387 vrele(cwdi->cwdi_rdir); 388 VREF(newdp); 389 cwdi->cwdi_rdir = newdp; 390 } 391 } 392 proclist_unlock_read(); 393 if (rootvnode == olddp) { 394 vrele(rootvnode); 395 VREF(newdp); 396 rootvnode = newdp; 397 } 398 vput(newdp); 399 } 400 401 /* 402 * Unmount a file system. 403 * 404 * Note: unmount takes a path to the vnode mounted on as argument, 405 * not special file (as before). 406 */ 407 /* ARGSUSED */ 408 int 409 sys_unmount(p, v, retval) 410 struct proc *p; 411 void *v; 412 register_t *retval; 413 { 414 register struct sys_unmount_args /* { 415 syscallarg(const char *) path; 416 syscallarg(int) flags; 417 } */ *uap = v; 418 register struct vnode *vp; 419 struct mount *mp; 420 int error; 421 struct nameidata nd; 422 423 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 424 SCARG(uap, path), p); 425 if ((error = namei(&nd)) != 0) 426 return (error); 427 vp = nd.ni_vp; 428 mp = vp->v_mount; 429 430 /* 431 * Only root, or the user that did the original mount is 432 * permitted to unmount this filesystem. 433 */ 434 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 435 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 436 vput(vp); 437 return (error); 438 } 439 440 /* 441 * Don't allow unmounting the root file system. 442 */ 443 if (mp->mnt_flag & MNT_ROOTFS) { 444 vput(vp); 445 return (EINVAL); 446 } 447 448 /* 449 * Must be the root of the filesystem 450 */ 451 if ((vp->v_flag & VROOT) == 0) { 452 vput(vp); 453 return (EINVAL); 454 } 455 vput(vp); 456 457 if (vfs_busy(mp, 0, 0)) 458 return (EBUSY); 459 460 return (dounmount(mp, SCARG(uap, flags), p)); 461 } 462 463 /* 464 * Do the actual file system unmount. File system is assumed to have been 465 * marked busy by the caller. 466 */ 467 int 468 dounmount(mp, flags, p) 469 register struct mount *mp; 470 int flags; 471 struct proc *p; 472 { 473 struct vnode *coveredvp; 474 int error; 475 int async; 476 477 simple_lock(&mountlist_slock); 478 mp->mnt_flag |= MNT_UNMOUNT; 479 vfs_unbusy(mp); 480 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 481 if (mp->mnt_flag & MNT_EXPUBLIC) 482 vfs_setpublicfs(NULL, NULL, NULL); 483 async = mp->mnt_flag & MNT_ASYNC; 484 mp->mnt_flag &=~ MNT_ASYNC; 485 cache_purgevfs(mp); /* remove cache entries for this file sys */ 486 if (mp->mnt_syncer != NULL) 487 vgone(mp->mnt_syncer); 488 if (((mp->mnt_flag & MNT_RDONLY) || 489 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 490 (flags & MNT_FORCE)) 491 error = VFS_UNMOUNT(mp, flags, p); 492 simple_lock(&mountlist_slock); 493 if (error) { 494 if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL) 495 (void) vfs_allocate_syncvnode(mp); 496 mp->mnt_flag &= ~MNT_UNMOUNT; 497 mp->mnt_flag |= async; 498 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 499 &mountlist_slock); 500 while(mp->mnt_wcnt > 0) { 501 wakeup((caddr_t)mp); 502 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 503 } 504 return (error); 505 } 506 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 507 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 508 coveredvp->v_mountedhere = NULL; 509 vrele(coveredvp); 510 } 511 mp->mnt_op->vfs_refcount--; 512 if (mp->mnt_vnodelist.lh_first != NULL) 513 panic("unmount: dangling vnode"); 514 mp->mnt_flag |= MNT_GONE; 515 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 516 while(mp->mnt_wcnt > 0) { 517 wakeup((caddr_t)mp); 518 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 519 } 520 free((caddr_t)mp, M_MOUNT); 521 return (0); 522 } 523 524 /* 525 * Sync each mounted filesystem. 526 */ 527 #ifdef DEBUG 528 int syncprt = 0; 529 struct ctldebug debug0 = { "syncprt", &syncprt }; 530 #endif 531 532 /* ARGSUSED */ 533 int 534 sys_sync(p, v, retval) 535 struct proc *p; 536 void *v; 537 register_t *retval; 538 { 539 register struct mount *mp, *nmp; 540 int asyncflag; 541 542 simple_lock(&mountlist_slock); 543 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 544 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 545 nmp = mp->mnt_list.cqe_prev; 546 continue; 547 } 548 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 549 asyncflag = mp->mnt_flag & MNT_ASYNC; 550 mp->mnt_flag &= ~MNT_ASYNC; 551 uvm_vnp_sync(mp); 552 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 553 if (asyncflag) 554 mp->mnt_flag |= MNT_ASYNC; 555 } 556 simple_lock(&mountlist_slock); 557 nmp = mp->mnt_list.cqe_prev; 558 vfs_unbusy(mp); 559 560 } 561 simple_unlock(&mountlist_slock); 562 #ifdef DEBUG 563 if (syncprt) 564 vfs_bufstats(); 565 #endif /* DEBUG */ 566 return (0); 567 } 568 569 /* 570 * Change filesystem quotas. 571 */ 572 /* ARGSUSED */ 573 int 574 sys_quotactl(p, v, retval) 575 struct proc *p; 576 void *v; 577 register_t *retval; 578 { 579 register struct sys_quotactl_args /* { 580 syscallarg(const char *) path; 581 syscallarg(int) cmd; 582 syscallarg(int) uid; 583 syscallarg(caddr_t) arg; 584 } */ *uap = v; 585 register struct mount *mp; 586 int error; 587 struct nameidata nd; 588 589 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 590 if ((error = namei(&nd)) != 0) 591 return (error); 592 mp = nd.ni_vp->v_mount; 593 vrele(nd.ni_vp); 594 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 595 SCARG(uap, arg), p)); 596 } 597 598 /* 599 * Get filesystem statistics. 600 */ 601 /* ARGSUSED */ 602 int 603 sys_statfs(p, v, retval) 604 struct proc *p; 605 void *v; 606 register_t *retval; 607 { 608 register struct sys_statfs_args /* { 609 syscallarg(const char *) path; 610 syscallarg(struct statfs *) buf; 611 } */ *uap = v; 612 register struct mount *mp; 613 register struct statfs *sp; 614 int error; 615 struct nameidata nd; 616 617 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 618 if ((error = namei(&nd)) != 0) 619 return (error); 620 mp = nd.ni_vp->v_mount; 621 sp = &mp->mnt_stat; 622 vrele(nd.ni_vp); 623 if ((error = VFS_STATFS(mp, sp, p)) != 0) 624 return (error); 625 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 626 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 627 } 628 629 /* 630 * Get filesystem statistics. 631 */ 632 /* ARGSUSED */ 633 int 634 sys_fstatfs(p, v, retval) 635 struct proc *p; 636 void *v; 637 register_t *retval; 638 { 639 register struct sys_fstatfs_args /* { 640 syscallarg(int) fd; 641 syscallarg(struct statfs *) buf; 642 } */ *uap = v; 643 struct file *fp; 644 struct mount *mp; 645 register struct statfs *sp; 646 int error; 647 648 /* getvnode() will use the descriptor for us */ 649 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 650 return (error); 651 mp = ((struct vnode *)fp->f_data)->v_mount; 652 sp = &mp->mnt_stat; 653 if ((error = VFS_STATFS(mp, sp, p)) != 0) 654 goto out; 655 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 656 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 657 out: 658 FILE_UNUSE(fp, p); 659 return (error); 660 } 661 662 /* 663 * Get statistics on all filesystems. 664 */ 665 int 666 sys_getfsstat(p, v, retval) 667 struct proc *p; 668 void *v; 669 register_t *retval; 670 { 671 register struct sys_getfsstat_args /* { 672 syscallarg(struct statfs *) buf; 673 syscallarg(long) bufsize; 674 syscallarg(int) flags; 675 } */ *uap = v; 676 register struct mount *mp, *nmp; 677 register struct statfs *sp; 678 caddr_t sfsp; 679 long count, maxcount, error; 680 681 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 682 sfsp = (caddr_t)SCARG(uap, buf); 683 simple_lock(&mountlist_slock); 684 count = 0; 685 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 686 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 687 nmp = mp->mnt_list.cqe_next; 688 continue; 689 } 690 if (sfsp && count < maxcount) { 691 sp = &mp->mnt_stat; 692 /* 693 * If MNT_NOWAIT or MNT_LAZY is specified, do not 694 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 695 * overrides MNT_NOWAIT. 696 */ 697 if (SCARG(uap, flags) != MNT_NOWAIT && 698 SCARG(uap, flags) != MNT_LAZY && 699 (SCARG(uap, flags) == MNT_WAIT || 700 SCARG(uap, flags) == 0) && 701 (error = VFS_STATFS(mp, sp, p)) != 0) { 702 simple_lock(&mountlist_slock); 703 nmp = mp->mnt_list.cqe_next; 704 vfs_unbusy(mp); 705 continue; 706 } 707 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 708 error = copyout(sp, sfsp, sizeof(*sp)); 709 if (error) { 710 vfs_unbusy(mp); 711 return (error); 712 } 713 sfsp += sizeof(*sp); 714 } 715 count++; 716 simple_lock(&mountlist_slock); 717 nmp = mp->mnt_list.cqe_next; 718 vfs_unbusy(mp); 719 } 720 simple_unlock(&mountlist_slock); 721 if (sfsp && count > maxcount) 722 *retval = maxcount; 723 else 724 *retval = count; 725 return (0); 726 } 727 728 /* 729 * Change current working directory to a given file descriptor. 730 */ 731 /* ARGSUSED */ 732 int 733 sys_fchdir(p, v, retval) 734 struct proc *p; 735 void *v; 736 register_t *retval; 737 { 738 struct sys_fchdir_args /* { 739 syscallarg(int) fd; 740 } */ *uap = v; 741 struct filedesc *fdp = p->p_fd; 742 struct cwdinfo *cwdi = p->p_cwdi; 743 struct vnode *vp, *tdp; 744 struct mount *mp; 745 struct file *fp; 746 int error; 747 748 /* getvnode() will use the descriptor for us */ 749 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 750 return (error); 751 vp = (struct vnode *)fp->f_data; 752 753 VREF(vp); 754 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 755 if (vp->v_type != VDIR) 756 error = ENOTDIR; 757 else 758 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 759 while (!error && (mp = vp->v_mountedhere) != NULL) { 760 if (vfs_busy(mp, 0, 0)) 761 continue; 762 error = VFS_ROOT(mp, &tdp); 763 vfs_unbusy(mp); 764 if (error) 765 break; 766 vput(vp); 767 vp = tdp; 768 } 769 if (error) { 770 vput(vp); 771 goto out; 772 } 773 VOP_UNLOCK(vp, 0); 774 775 /* 776 * Disallow changing to a directory not under the process's 777 * current root directory (if there is one). 778 */ 779 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 780 vrele(vp); 781 error = EPERM; /* operation not permitted */ 782 goto out; 783 } 784 785 vrele(cwdi->cwdi_cdir); 786 cwdi->cwdi_cdir = vp; 787 out: 788 FILE_UNUSE(fp, p); 789 return (error); 790 } 791 792 /* 793 * Change this process's notion of the root directory to a given file descriptor. 794 */ 795 796 int 797 sys_fchroot(p, v, retval) 798 struct proc *p; 799 void *v; 800 register_t *retval; 801 { 802 struct sys_fchroot_args *uap = v; 803 struct filedesc *fdp = p->p_fd; 804 struct cwdinfo *cwdi = p->p_cwdi; 805 struct vnode *vp; 806 struct file *fp; 807 int error; 808 809 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 810 return error; 811 /* getvnode() will use the descriptor for us */ 812 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 813 return error; 814 vp = (struct vnode *) fp->f_data; 815 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 816 if (vp->v_type != VDIR) 817 error = ENOTDIR; 818 else 819 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 820 VOP_UNLOCK(vp, 0); 821 if (error) 822 goto out; 823 VREF(vp); 824 825 /* 826 * Prevent escaping from chroot by putting the root under 827 * the working directory. Silently chdir to / if we aren't 828 * already there. 829 */ 830 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 831 /* 832 * XXX would be more failsafe to change directory to a 833 * deadfs node here instead 834 */ 835 vrele(cwdi->cwdi_cdir); 836 VREF(vp); 837 cwdi->cwdi_cdir = vp; 838 } 839 840 if (cwdi->cwdi_rdir != NULL) 841 vrele(cwdi->cwdi_rdir); 842 cwdi->cwdi_rdir = vp; 843 out: 844 FILE_UNUSE(fp, p); 845 return (error); 846 } 847 848 849 850 /* 851 * Change current working directory (``.''). 852 */ 853 /* ARGSUSED */ 854 int 855 sys_chdir(p, v, retval) 856 struct proc *p; 857 void *v; 858 register_t *retval; 859 { 860 struct sys_chdir_args /* { 861 syscallarg(const char *) path; 862 } */ *uap = v; 863 struct cwdinfo *cwdi = p->p_cwdi; 864 int error; 865 struct nameidata nd; 866 867 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 868 SCARG(uap, path), p); 869 if ((error = change_dir(&nd, p)) != 0) 870 return (error); 871 vrele(cwdi->cwdi_cdir); 872 cwdi->cwdi_cdir = nd.ni_vp; 873 return (0); 874 } 875 876 /* 877 * Change notion of root (``/'') directory. 878 */ 879 /* ARGSUSED */ 880 int 881 sys_chroot(p, v, retval) 882 struct proc *p; 883 void *v; 884 register_t *retval; 885 { 886 struct sys_chroot_args /* { 887 syscallarg(const char *) path; 888 } */ *uap = v; 889 struct cwdinfo *cwdi = p->p_cwdi; 890 struct vnode *vp; 891 int error; 892 struct nameidata nd; 893 894 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 895 return (error); 896 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 897 SCARG(uap, path), p); 898 if ((error = change_dir(&nd, p)) != 0) 899 return (error); 900 if (cwdi->cwdi_rdir != NULL) 901 vrele(cwdi->cwdi_rdir); 902 vp = nd.ni_vp; 903 cwdi->cwdi_rdir = vp; 904 905 /* 906 * Prevent escaping from chroot by putting the root under 907 * the working directory. Silently chdir to / if we aren't 908 * already there. 909 */ 910 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 911 /* 912 * XXX would be more failsafe to change directory to a 913 * deadfs node here instead 914 */ 915 vrele(cwdi->cwdi_cdir); 916 VREF(vp); 917 cwdi->cwdi_cdir = vp; 918 } 919 920 return (0); 921 } 922 923 /* 924 * Common routine for chroot and chdir. 925 */ 926 static int 927 change_dir(ndp, p) 928 register struct nameidata *ndp; 929 struct proc *p; 930 { 931 struct vnode *vp; 932 int error; 933 934 if ((error = namei(ndp)) != 0) 935 return (error); 936 vp = ndp->ni_vp; 937 if (vp->v_type != VDIR) 938 error = ENOTDIR; 939 else 940 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 941 942 if (error) 943 vput(vp); 944 else 945 VOP_UNLOCK(vp, 0); 946 return (error); 947 } 948 949 /* 950 * Check permissions, allocate an open file structure, 951 * and call the device open routine if any. 952 */ 953 int 954 sys_open(p, v, retval) 955 struct proc *p; 956 void *v; 957 register_t *retval; 958 { 959 register struct sys_open_args /* { 960 syscallarg(const char *) path; 961 syscallarg(int) flags; 962 syscallarg(int) mode; 963 } */ *uap = v; 964 struct cwdinfo *cwdi = p->p_cwdi; 965 struct filedesc *fdp = p->p_fd; 966 struct file *fp; 967 struct vnode *vp; 968 int flags, cmode; 969 int type, indx, error; 970 struct flock lf; 971 struct nameidata nd; 972 extern struct fileops vnops; 973 974 flags = FFLAGS(SCARG(uap, flags)); 975 if ((flags & (FREAD | FWRITE)) == 0) 976 return (EINVAL); 977 /* falloc() will use the file descriptor for us */ 978 if ((error = falloc(p, &fp, &indx)) != 0) 979 return (error); 980 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 981 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 982 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 983 if ((error = vn_open(&nd, flags, cmode)) != 0) { 984 FILE_UNUSE(fp, p); 985 ffree(fp); 986 if ((error == ENODEV || error == ENXIO) && 987 p->p_dupfd >= 0 && /* XXX from fdopen */ 988 (error = 989 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 990 *retval = indx; 991 return (0); 992 } 993 if (error == ERESTART) 994 error = EINTR; 995 fdp->fd_ofiles[indx] = NULL; 996 return (error); 997 } 998 p->p_dupfd = 0; 999 vp = nd.ni_vp; 1000 fp->f_flag = flags & FMASK; 1001 fp->f_type = DTYPE_VNODE; 1002 fp->f_ops = &vnops; 1003 fp->f_data = (caddr_t)vp; 1004 if (flags & (O_EXLOCK | O_SHLOCK)) { 1005 lf.l_whence = SEEK_SET; 1006 lf.l_start = 0; 1007 lf.l_len = 0; 1008 if (flags & O_EXLOCK) 1009 lf.l_type = F_WRLCK; 1010 else 1011 lf.l_type = F_RDLCK; 1012 type = F_FLOCK; 1013 if ((flags & FNONBLOCK) == 0) 1014 type |= F_WAIT; 1015 VOP_UNLOCK(vp, 0); 1016 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1017 if (error) { 1018 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1019 FILE_UNUSE(fp, p); 1020 ffree(fp); 1021 fdp->fd_ofiles[indx] = NULL; 1022 return (error); 1023 } 1024 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1025 fp->f_flag |= FHASLOCK; 1026 } 1027 VOP_UNLOCK(vp, 0); 1028 *retval = indx; 1029 FILE_UNUSE(fp, p); 1030 return (0); 1031 } 1032 1033 /* 1034 * Get file handle system call 1035 */ 1036 int 1037 sys_getfh(p, v, retval) 1038 struct proc *p; 1039 register void *v; 1040 register_t *retval; 1041 { 1042 register struct sys_getfh_args /* { 1043 syscallarg(char *) fname; 1044 syscallarg(fhandle_t *) fhp; 1045 } */ *uap = v; 1046 register struct vnode *vp; 1047 fhandle_t fh; 1048 int error; 1049 struct nameidata nd; 1050 1051 /* 1052 * Must be super user 1053 */ 1054 error = suser(p->p_ucred, &p->p_acflag); 1055 if (error) 1056 return (error); 1057 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1058 SCARG(uap, fname), p); 1059 error = namei(&nd); 1060 if (error) 1061 return (error); 1062 vp = nd.ni_vp; 1063 memset((caddr_t)&fh, 0, sizeof(fh)); 1064 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1065 error = VFS_VPTOFH(vp, &fh.fh_fid); 1066 vput(vp); 1067 if (error) 1068 return (error); 1069 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1070 return (error); 1071 } 1072 1073 /* 1074 * Open a file given a file handle. 1075 * 1076 * Check permissions, allocate an open file structure, 1077 * and call the device open routine if any. 1078 */ 1079 int 1080 sys_fhopen(p, v, retval) 1081 struct proc *p; 1082 void *v; 1083 register_t *retval; 1084 { 1085 register struct sys_fhopen_args /* { 1086 syscallarg(const fhandle_t *) fhp; 1087 syscallarg(int) flags; 1088 } */ *uap = v; 1089 struct filedesc *fdp = p->p_fd; 1090 struct file *fp; 1091 struct vnode *vp = NULL; 1092 struct mount *mp; 1093 struct ucred *cred = p->p_ucred; 1094 int flags; 1095 struct file *nfp; 1096 int type, indx, error=0; 1097 struct flock lf; 1098 struct vattr va; 1099 fhandle_t fh; 1100 extern struct fileops vnops; 1101 1102 /* 1103 * Must be super user 1104 */ 1105 if ((error = suser(p->p_ucred, &p->p_acflag))) 1106 return (error); 1107 1108 flags = FFLAGS(SCARG(uap, flags)); 1109 if ((flags & (FREAD | FWRITE)) == 0) 1110 return (EINVAL); 1111 if ((flags & O_CREAT)) 1112 return (EINVAL); 1113 /* falloc() will use the file descriptor for us */ 1114 if ((error = falloc(p, &nfp, &indx)) != 0) 1115 return (error); 1116 fp = nfp; 1117 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1118 goto bad; 1119 1120 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1121 error = ESTALE; 1122 goto bad; 1123 } 1124 1125 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1126 vp = NULL; /* most likely unnecessary sanity for bad: */ 1127 goto bad; 1128 } 1129 1130 /* Now do an effective vn_open */ 1131 1132 if (vp->v_type == VSOCK) { 1133 error = EOPNOTSUPP; 1134 goto bad; 1135 } 1136 if (flags & FREAD) { 1137 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1138 goto bad; 1139 } 1140 if (flags & (FWRITE | O_TRUNC)) { 1141 if (vp->v_type == VDIR) { 1142 error = EISDIR; 1143 goto bad; 1144 } 1145 if ((error = vn_writechk(vp)) != 0 || 1146 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1147 goto bad; 1148 } 1149 if (flags & O_TRUNC) { 1150 VOP_UNLOCK(vp, 0); /* XXX */ 1151 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1152 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1153 VATTR_NULL(&va); 1154 va.va_size = 0; 1155 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1156 goto bad; 1157 } 1158 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1159 goto bad; 1160 if (flags & FWRITE) 1161 vp->v_writecount++; 1162 1163 /* done with modified vn_open, now finish what sys_open does. */ 1164 1165 fp->f_flag = flags & FMASK; 1166 fp->f_type = DTYPE_VNODE; 1167 fp->f_ops = &vnops; 1168 fp->f_data = (caddr_t)vp; 1169 if (flags & (O_EXLOCK | O_SHLOCK)) { 1170 lf.l_whence = SEEK_SET; 1171 lf.l_start = 0; 1172 lf.l_len = 0; 1173 if (flags & O_EXLOCK) 1174 lf.l_type = F_WRLCK; 1175 else 1176 lf.l_type = F_RDLCK; 1177 type = F_FLOCK; 1178 if ((flags & FNONBLOCK) == 0) 1179 type |= F_WAIT; 1180 VOP_UNLOCK(vp, 0); 1181 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1182 if (error) { 1183 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1184 FILE_UNUSE(fp, p); 1185 ffree(fp); 1186 fdp->fd_ofiles[indx] = NULL; 1187 return (error); 1188 } 1189 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1190 fp->f_flag |= FHASLOCK; 1191 } 1192 VOP_UNLOCK(vp, 0); 1193 *retval = indx; 1194 FILE_UNUSE(fp, p); 1195 return (0); 1196 1197 bad: 1198 FILE_UNUSE(fp, p); 1199 ffree(fp); 1200 fdp->fd_ofiles[indx] = NULL; 1201 if (vp != NULL) 1202 vput(vp); 1203 return (error); 1204 } 1205 1206 /* ARGSUSED */ 1207 int 1208 sys_fhstat(p, v, retval) 1209 struct proc *p; 1210 void *v; 1211 register_t *retval; 1212 { 1213 register struct sys_fhstat_args /* { 1214 syscallarg(const fhandle_t *) fhp; 1215 syscallarg(struct stat *) sb; 1216 } */ *uap = v; 1217 struct stat sb; 1218 int error; 1219 fhandle_t fh; 1220 struct mount *mp; 1221 struct vnode *vp; 1222 1223 /* 1224 * Must be super user 1225 */ 1226 if ((error = suser(p->p_ucred, &p->p_acflag))) 1227 return (error); 1228 1229 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1230 return (error); 1231 1232 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1233 return (ESTALE); 1234 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1235 return (error); 1236 error = vn_stat(vp, &sb, p); 1237 vput(vp); 1238 if (error) 1239 return (error); 1240 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1241 return (error); 1242 } 1243 1244 /* ARGSUSED */ 1245 int 1246 sys_fhstatfs(p, v, retval) 1247 struct proc *p; 1248 void *v; 1249 register_t *retval; 1250 { 1251 register struct sys_fhstatfs_args /* 1252 syscallarg(const fhandle_t *) fhp; 1253 syscallarg(struct statfs *) buf; 1254 } */ *uap = v; 1255 struct statfs sp; 1256 fhandle_t fh; 1257 struct mount *mp; 1258 struct vnode *vp; 1259 int error; 1260 1261 /* 1262 * Must be super user 1263 */ 1264 if ((error = suser(p->p_ucred, &p->p_acflag))) 1265 return (error); 1266 1267 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1268 return (error); 1269 1270 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1271 return (ESTALE); 1272 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1273 return (error); 1274 mp = vp->v_mount; 1275 vput(vp); 1276 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1277 return (error); 1278 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1279 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1280 } 1281 1282 /* 1283 * Create a special file. 1284 */ 1285 /* ARGSUSED */ 1286 int 1287 sys_mknod(p, v, retval) 1288 struct proc *p; 1289 void *v; 1290 register_t *retval; 1291 { 1292 register struct sys_mknod_args /* { 1293 syscallarg(const char *) path; 1294 syscallarg(int) mode; 1295 syscallarg(int) dev; 1296 } */ *uap = v; 1297 register struct vnode *vp; 1298 struct vattr vattr; 1299 int error; 1300 int whiteout = 0; 1301 struct nameidata nd; 1302 1303 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1304 return (error); 1305 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1306 if ((error = namei(&nd)) != 0) 1307 return (error); 1308 vp = nd.ni_vp; 1309 if (vp != NULL) 1310 error = EEXIST; 1311 else { 1312 VATTR_NULL(&vattr); 1313 vattr.va_mode = 1314 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1315 vattr.va_rdev = SCARG(uap, dev); 1316 whiteout = 0; 1317 1318 switch (SCARG(uap, mode) & S_IFMT) { 1319 case S_IFMT: /* used by badsect to flag bad sectors */ 1320 vattr.va_type = VBAD; 1321 break; 1322 case S_IFCHR: 1323 vattr.va_type = VCHR; 1324 break; 1325 case S_IFBLK: 1326 vattr.va_type = VBLK; 1327 break; 1328 case S_IFWHT: 1329 whiteout = 1; 1330 break; 1331 default: 1332 error = EINVAL; 1333 break; 1334 } 1335 } 1336 if (!error) { 1337 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1338 if (whiteout) { 1339 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1340 if (error) 1341 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1342 vput(nd.ni_dvp); 1343 } else { 1344 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1345 &nd.ni_cnd, &vattr); 1346 } 1347 } else { 1348 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1349 if (nd.ni_dvp == vp) 1350 vrele(nd.ni_dvp); 1351 else 1352 vput(nd.ni_dvp); 1353 if (vp) 1354 vrele(vp); 1355 } 1356 return (error); 1357 } 1358 1359 /* 1360 * Create a named pipe. 1361 */ 1362 /* ARGSUSED */ 1363 int 1364 sys_mkfifo(p, v, retval) 1365 struct proc *p; 1366 void *v; 1367 register_t *retval; 1368 { 1369 register struct sys_mkfifo_args /* { 1370 syscallarg(const char *) path; 1371 syscallarg(int) mode; 1372 } */ *uap = v; 1373 struct vattr vattr; 1374 int error; 1375 struct nameidata nd; 1376 1377 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1378 if ((error = namei(&nd)) != 0) 1379 return (error); 1380 if (nd.ni_vp != NULL) { 1381 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1382 if (nd.ni_dvp == nd.ni_vp) 1383 vrele(nd.ni_dvp); 1384 else 1385 vput(nd.ni_dvp); 1386 vrele(nd.ni_vp); 1387 return (EEXIST); 1388 } 1389 VATTR_NULL(&vattr); 1390 vattr.va_type = VFIFO; 1391 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1392 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1393 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1394 } 1395 1396 /* 1397 * Make a hard file link. 1398 */ 1399 /* ARGSUSED */ 1400 int 1401 sys_link(p, v, retval) 1402 struct proc *p; 1403 void *v; 1404 register_t *retval; 1405 { 1406 register struct sys_link_args /* { 1407 syscallarg(const char *) path; 1408 syscallarg(const char *) link; 1409 } */ *uap = v; 1410 register struct vnode *vp; 1411 struct nameidata nd; 1412 int error; 1413 1414 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1415 if ((error = namei(&nd)) != 0) 1416 return (error); 1417 vp = nd.ni_vp; 1418 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1419 if ((error = namei(&nd)) != 0) 1420 goto out; 1421 if (nd.ni_vp) { 1422 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1423 if (nd.ni_dvp == nd.ni_vp) 1424 vrele(nd.ni_dvp); 1425 else 1426 vput(nd.ni_dvp); 1427 vrele(nd.ni_vp); 1428 error = EEXIST; 1429 goto out; 1430 } 1431 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1432 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1433 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1434 out: 1435 vrele(vp); 1436 return (error); 1437 } 1438 1439 /* 1440 * Make a symbolic link. 1441 */ 1442 /* ARGSUSED */ 1443 int 1444 sys_symlink(p, v, retval) 1445 struct proc *p; 1446 void *v; 1447 register_t *retval; 1448 { 1449 register struct sys_symlink_args /* { 1450 syscallarg(const char *) path; 1451 syscallarg(const char *) link; 1452 } */ *uap = v; 1453 struct vattr vattr; 1454 char *path; 1455 int error; 1456 struct nameidata nd; 1457 1458 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1459 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1460 if (error) 1461 goto out; 1462 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1463 if ((error = namei(&nd)) != 0) 1464 goto out; 1465 if (nd.ni_vp) { 1466 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1467 if (nd.ni_dvp == nd.ni_vp) 1468 vrele(nd.ni_dvp); 1469 else 1470 vput(nd.ni_dvp); 1471 vrele(nd.ni_vp); 1472 error = EEXIST; 1473 goto out; 1474 } 1475 VATTR_NULL(&vattr); 1476 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1477 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1478 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1479 out: 1480 FREE(path, M_NAMEI); 1481 return (error); 1482 } 1483 1484 /* 1485 * Delete a whiteout from the filesystem. 1486 */ 1487 /* ARGSUSED */ 1488 int 1489 sys_undelete(p, v, retval) 1490 struct proc *p; 1491 void *v; 1492 register_t *retval; 1493 { 1494 register struct sys_undelete_args /* { 1495 syscallarg(const char *) path; 1496 } */ *uap = v; 1497 int error; 1498 struct nameidata nd; 1499 1500 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1501 SCARG(uap, path), p); 1502 error = namei(&nd); 1503 if (error) 1504 return (error); 1505 1506 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1507 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1508 if (nd.ni_dvp == nd.ni_vp) 1509 vrele(nd.ni_dvp); 1510 else 1511 vput(nd.ni_dvp); 1512 if (nd.ni_vp) 1513 vrele(nd.ni_vp); 1514 return (EEXIST); 1515 } 1516 1517 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1518 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1519 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1520 vput(nd.ni_dvp); 1521 return (error); 1522 } 1523 1524 /* 1525 * Delete a name from the filesystem. 1526 */ 1527 /* ARGSUSED */ 1528 int 1529 sys_unlink(p, v, retval) 1530 struct proc *p; 1531 void *v; 1532 register_t *retval; 1533 { 1534 struct sys_unlink_args /* { 1535 syscallarg(const char *) path; 1536 } */ *uap = v; 1537 register struct vnode *vp; 1538 int error; 1539 struct nameidata nd; 1540 1541 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1542 SCARG(uap, path), p); 1543 if ((error = namei(&nd)) != 0) 1544 return (error); 1545 vp = nd.ni_vp; 1546 1547 /* 1548 * The root of a mounted filesystem cannot be deleted. 1549 */ 1550 if (vp->v_flag & VROOT) { 1551 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1552 if (nd.ni_dvp == vp) 1553 vrele(nd.ni_dvp); 1554 else 1555 vput(nd.ni_dvp); 1556 vput(vp); 1557 error = EBUSY; 1558 goto out; 1559 } 1560 1561 (void)uvm_vnp_uncache(vp); 1562 1563 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1564 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1565 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1566 out: 1567 return (error); 1568 } 1569 1570 /* 1571 * Reposition read/write file offset. 1572 */ 1573 int 1574 sys_lseek(p, v, retval) 1575 struct proc *p; 1576 void *v; 1577 register_t *retval; 1578 { 1579 register struct sys_lseek_args /* { 1580 syscallarg(int) fd; 1581 syscallarg(int) pad; 1582 syscallarg(off_t) offset; 1583 syscallarg(int) whence; 1584 } */ *uap = v; 1585 struct ucred *cred = p->p_ucred; 1586 register struct filedesc *fdp = p->p_fd; 1587 register struct file *fp; 1588 struct vnode *vp; 1589 struct vattr vattr; 1590 register off_t newoff; 1591 int error; 1592 1593 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1594 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1595 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1596 return (EBADF); 1597 1598 FILE_USE(fp); 1599 1600 vp = (struct vnode *)fp->f_data; 1601 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1602 error = ESPIPE; 1603 goto out; 1604 } 1605 1606 switch (SCARG(uap, whence)) { 1607 case SEEK_CUR: 1608 newoff = fp->f_offset + SCARG(uap, offset); 1609 break; 1610 case SEEK_END: 1611 error = VOP_GETATTR(vp, &vattr, cred, p); 1612 if (error) 1613 goto out; 1614 newoff = SCARG(uap, offset) + vattr.va_size; 1615 break; 1616 case SEEK_SET: 1617 newoff = SCARG(uap, offset); 1618 break; 1619 default: 1620 error = EINVAL; 1621 goto out; 1622 } 1623 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1624 goto out; 1625 1626 *(off_t *)retval = fp->f_offset = newoff; 1627 out: 1628 FILE_UNUSE(fp, p); 1629 return (error); 1630 } 1631 1632 /* 1633 * Positional read system call. 1634 */ 1635 int 1636 sys_pread(p, v, retval) 1637 struct proc *p; 1638 void *v; 1639 register_t *retval; 1640 { 1641 struct sys_pread_args /* { 1642 syscallarg(int) fd; 1643 syscallarg(void *) buf; 1644 syscallarg(size_t) nbyte; 1645 syscallarg(off_t) offset; 1646 } */ *uap = v; 1647 struct filedesc *fdp = p->p_fd; 1648 struct file *fp; 1649 struct vnode *vp; 1650 off_t offset; 1651 int error, fd = SCARG(uap, fd); 1652 1653 if ((u_int)fd >= fdp->fd_nfiles || 1654 (fp = fdp->fd_ofiles[fd]) == NULL || 1655 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1656 (fp->f_flag & FREAD) == 0) 1657 return (EBADF); 1658 1659 FILE_USE(fp); 1660 1661 vp = (struct vnode *)fp->f_data; 1662 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1663 error = ESPIPE; 1664 goto out; 1665 } 1666 1667 offset = SCARG(uap, offset); 1668 1669 /* 1670 * XXX This works because no file systems actually 1671 * XXX take any action on the seek operation. 1672 */ 1673 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1674 goto out; 1675 1676 /* dofileread() will unuse the descriptor for us */ 1677 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1678 &offset, 0, retval)); 1679 1680 out: 1681 FILE_UNUSE(fp, p); 1682 return (error); 1683 } 1684 1685 /* 1686 * Positional scatter read system call. 1687 */ 1688 int 1689 sys_preadv(p, v, retval) 1690 struct proc *p; 1691 void *v; 1692 register_t *retval; 1693 { 1694 struct sys_preadv_args /* { 1695 syscallarg(int) fd; 1696 syscallarg(const struct iovec *) iovp; 1697 syscallarg(int) iovcnt; 1698 syscallarg(off_t) offset; 1699 } */ *uap = v; 1700 struct filedesc *fdp = p->p_fd; 1701 struct file *fp; 1702 struct vnode *vp; 1703 off_t offset; 1704 int error, fd = SCARG(uap, fd); 1705 1706 if ((u_int)fd >= fdp->fd_nfiles || 1707 (fp = fdp->fd_ofiles[fd]) == NULL || 1708 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1709 (fp->f_flag & FREAD) == 0) 1710 return (EBADF); 1711 1712 FILE_USE(fp); 1713 1714 vp = (struct vnode *)fp->f_data; 1715 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1716 error = ESPIPE; 1717 goto out; 1718 } 1719 1720 offset = SCARG(uap, offset); 1721 1722 /* 1723 * XXX This works because no file systems actually 1724 * XXX take any action on the seek operation. 1725 */ 1726 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1727 goto out; 1728 1729 /* dofilereadv() will unuse the descriptor for us */ 1730 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1731 &offset, 0, retval)); 1732 1733 out: 1734 FILE_UNUSE(fp, p); 1735 return (error); 1736 } 1737 1738 /* 1739 * Positional write system call. 1740 */ 1741 int 1742 sys_pwrite(p, v, retval) 1743 struct proc *p; 1744 void *v; 1745 register_t *retval; 1746 { 1747 struct sys_pwrite_args /* { 1748 syscallarg(int) fd; 1749 syscallarg(const void *) buf; 1750 syscallarg(size_t) nbyte; 1751 syscallarg(off_t) offset; 1752 } */ *uap = v; 1753 struct filedesc *fdp = p->p_fd; 1754 struct file *fp; 1755 struct vnode *vp; 1756 off_t offset; 1757 int error, fd = SCARG(uap, fd); 1758 1759 if ((u_int)fd >= fdp->fd_nfiles || 1760 (fp = fdp->fd_ofiles[fd]) == NULL || 1761 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1762 (fp->f_flag & FWRITE) == 0) 1763 return (EBADF); 1764 1765 FILE_USE(fp); 1766 1767 vp = (struct vnode *)fp->f_data; 1768 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1769 error = ESPIPE; 1770 goto out; 1771 } 1772 1773 offset = SCARG(uap, offset); 1774 1775 /* 1776 * XXX This works because no file systems actually 1777 * XXX take any action on the seek operation. 1778 */ 1779 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1780 goto out; 1781 1782 /* dofilewrite() will unuse the descriptor for us */ 1783 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1784 &offset, 0, retval)); 1785 1786 out: 1787 FILE_UNUSE(fp, p); 1788 return (error); 1789 } 1790 1791 /* 1792 * Positional gather write system call. 1793 */ 1794 int 1795 sys_pwritev(p, v, retval) 1796 struct proc *p; 1797 void *v; 1798 register_t *retval; 1799 { 1800 struct sys_pwritev_args /* { 1801 syscallarg(int) fd; 1802 syscallarg(const struct iovec *) iovp; 1803 syscallarg(int) iovcnt; 1804 syscallarg(off_t) offset; 1805 } */ *uap = v; 1806 struct filedesc *fdp = p->p_fd; 1807 struct file *fp; 1808 struct vnode *vp; 1809 off_t offset; 1810 int error, fd = SCARG(uap, fd); 1811 1812 if ((u_int)fd >= fdp->fd_nfiles || 1813 (fp = fdp->fd_ofiles[fd]) == NULL || 1814 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1815 (fp->f_flag & FWRITE) == 0) 1816 return (EBADF); 1817 1818 FILE_USE(fp); 1819 1820 vp = (struct vnode *)fp->f_data; 1821 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1822 error = ESPIPE; 1823 goto out; 1824 } 1825 1826 offset = SCARG(uap, offset); 1827 1828 /* 1829 * XXX This works because no file systems actually 1830 * XXX take any action on the seek operation. 1831 */ 1832 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1833 goto out; 1834 1835 /* dofilewritev() will unuse the descriptor for us */ 1836 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1837 &offset, 0, retval)); 1838 1839 out: 1840 FILE_UNUSE(fp, p); 1841 return (error); 1842 } 1843 1844 /* 1845 * Check access permissions. 1846 */ 1847 int 1848 sys_access(p, v, retval) 1849 struct proc *p; 1850 void *v; 1851 register_t *retval; 1852 { 1853 register struct sys_access_args /* { 1854 syscallarg(const char *) path; 1855 syscallarg(int) flags; 1856 } */ *uap = v; 1857 register struct ucred *cred = p->p_ucred; 1858 register struct vnode *vp; 1859 int error, flags, t_gid, t_uid; 1860 struct nameidata nd; 1861 1862 t_uid = cred->cr_uid; 1863 t_gid = cred->cr_gid; 1864 cred->cr_uid = p->p_cred->p_ruid; 1865 cred->cr_gid = p->p_cred->p_rgid; 1866 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1867 SCARG(uap, path), p); 1868 if ((error = namei(&nd)) != 0) 1869 goto out1; 1870 vp = nd.ni_vp; 1871 1872 /* Flags == 0 means only check for existence. */ 1873 if (SCARG(uap, flags)) { 1874 flags = 0; 1875 if (SCARG(uap, flags) & R_OK) 1876 flags |= VREAD; 1877 if (SCARG(uap, flags) & W_OK) 1878 flags |= VWRITE; 1879 if (SCARG(uap, flags) & X_OK) 1880 flags |= VEXEC; 1881 1882 error = VOP_ACCESS(vp, flags, cred, p); 1883 if (!error && (flags & VWRITE)) 1884 error = vn_writechk(vp); 1885 } 1886 vput(vp); 1887 out1: 1888 cred->cr_uid = t_uid; 1889 cred->cr_gid = t_gid; 1890 return (error); 1891 } 1892 1893 /* 1894 * Get file status; this version follows links. 1895 */ 1896 /* ARGSUSED */ 1897 int 1898 sys___stat13(p, v, retval) 1899 struct proc *p; 1900 void *v; 1901 register_t *retval; 1902 { 1903 register struct sys___stat13_args /* { 1904 syscallarg(const char *) path; 1905 syscallarg(struct stat *) ub; 1906 } */ *uap = v; 1907 struct stat sb; 1908 int error; 1909 struct nameidata nd; 1910 1911 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1912 SCARG(uap, path), p); 1913 if ((error = namei(&nd)) != 0) 1914 return (error); 1915 error = vn_stat(nd.ni_vp, &sb, p); 1916 vput(nd.ni_vp); 1917 if (error) 1918 return (error); 1919 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1920 return (error); 1921 } 1922 1923 /* 1924 * Get file status; this version does not follow links. 1925 */ 1926 /* ARGSUSED */ 1927 int 1928 sys___lstat13(p, v, retval) 1929 struct proc *p; 1930 void *v; 1931 register_t *retval; 1932 { 1933 register struct sys___lstat13_args /* { 1934 syscallarg(const char *) path; 1935 syscallarg(struct stat *) ub; 1936 } */ *uap = v; 1937 struct stat sb; 1938 int error; 1939 struct nameidata nd; 1940 1941 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1942 SCARG(uap, path), p); 1943 if ((error = namei(&nd)) != 0) 1944 return (error); 1945 error = vn_stat(nd.ni_vp, &sb, p); 1946 vput(nd.ni_vp); 1947 if (error) 1948 return (error); 1949 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1950 return (error); 1951 } 1952 1953 /* 1954 * Get configurable pathname variables. 1955 */ 1956 /* ARGSUSED */ 1957 int 1958 sys_pathconf(p, v, retval) 1959 struct proc *p; 1960 void *v; 1961 register_t *retval; 1962 { 1963 register struct sys_pathconf_args /* { 1964 syscallarg(const char *) path; 1965 syscallarg(int) name; 1966 } */ *uap = v; 1967 int error; 1968 struct nameidata nd; 1969 1970 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1971 SCARG(uap, path), p); 1972 if ((error = namei(&nd)) != 0) 1973 return (error); 1974 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1975 vput(nd.ni_vp); 1976 return (error); 1977 } 1978 1979 /* 1980 * Return target name of a symbolic link. 1981 */ 1982 /* ARGSUSED */ 1983 int 1984 sys_readlink(p, v, retval) 1985 struct proc *p; 1986 void *v; 1987 register_t *retval; 1988 { 1989 register struct sys_readlink_args /* { 1990 syscallarg(const char *) path; 1991 syscallarg(char *) buf; 1992 syscallarg(size_t) count; 1993 } */ *uap = v; 1994 register struct vnode *vp; 1995 struct iovec aiov; 1996 struct uio auio; 1997 int error; 1998 struct nameidata nd; 1999 2000 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2001 SCARG(uap, path), p); 2002 if ((error = namei(&nd)) != 0) 2003 return (error); 2004 vp = nd.ni_vp; 2005 if (vp->v_type != VLNK) 2006 error = EINVAL; 2007 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2008 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2009 aiov.iov_base = SCARG(uap, buf); 2010 aiov.iov_len = SCARG(uap, count); 2011 auio.uio_iov = &aiov; 2012 auio.uio_iovcnt = 1; 2013 auio.uio_offset = 0; 2014 auio.uio_rw = UIO_READ; 2015 auio.uio_segflg = UIO_USERSPACE; 2016 auio.uio_procp = p; 2017 auio.uio_resid = SCARG(uap, count); 2018 error = VOP_READLINK(vp, &auio, p->p_ucred); 2019 } 2020 vput(vp); 2021 *retval = SCARG(uap, count) - auio.uio_resid; 2022 return (error); 2023 } 2024 2025 /* 2026 * Change flags of a file given a path name. 2027 */ 2028 /* ARGSUSED */ 2029 int 2030 sys_chflags(p, v, retval) 2031 struct proc *p; 2032 void *v; 2033 register_t *retval; 2034 { 2035 register struct sys_chflags_args /* { 2036 syscallarg(const char *) path; 2037 syscallarg(u_long) flags; 2038 } */ *uap = v; 2039 register struct vnode *vp; 2040 struct vattr vattr; 2041 int error; 2042 struct nameidata nd; 2043 2044 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2045 if ((error = namei(&nd)) != 0) 2046 return (error); 2047 vp = nd.ni_vp; 2048 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2049 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2050 /* Non-superusers cannot change the flags on devices, even if they 2051 own them. */ 2052 if (suser(p->p_ucred, &p->p_acflag)) { 2053 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2054 goto out; 2055 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2056 error = EINVAL; 2057 goto out; 2058 } 2059 } 2060 VATTR_NULL(&vattr); 2061 vattr.va_flags = SCARG(uap, flags); 2062 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2063 out: 2064 vput(vp); 2065 return (error); 2066 } 2067 2068 /* 2069 * Change flags of a file given a file descriptor. 2070 */ 2071 /* ARGSUSED */ 2072 int 2073 sys_fchflags(p, v, retval) 2074 struct proc *p; 2075 void *v; 2076 register_t *retval; 2077 { 2078 register struct sys_fchflags_args /* { 2079 syscallarg(int) fd; 2080 syscallarg(u_long) flags; 2081 } */ *uap = v; 2082 struct vattr vattr; 2083 struct vnode *vp; 2084 struct file *fp; 2085 int error; 2086 2087 /* getvnode() will use the descriptor for us */ 2088 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2089 return (error); 2090 vp = (struct vnode *)fp->f_data; 2091 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2092 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2093 /* Non-superusers cannot change the flags on devices, even if they 2094 own them. */ 2095 if (suser(p->p_ucred, &p->p_acflag)) { 2096 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) 2097 != 0) 2098 goto out; 2099 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2100 error = EINVAL; 2101 goto out; 2102 } 2103 } 2104 VATTR_NULL(&vattr); 2105 vattr.va_flags = SCARG(uap, flags); 2106 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2107 out: 2108 VOP_UNLOCK(vp, 0); 2109 FILE_UNUSE(fp, p); 2110 return (error); 2111 } 2112 2113 /* 2114 * Change mode of a file given path name; this version follows links. 2115 */ 2116 /* ARGSUSED */ 2117 int 2118 sys_chmod(p, v, retval) 2119 struct proc *p; 2120 void *v; 2121 register_t *retval; 2122 { 2123 register struct sys_chmod_args /* { 2124 syscallarg(const char *) path; 2125 syscallarg(int) mode; 2126 } */ *uap = v; 2127 int error; 2128 struct nameidata nd; 2129 2130 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2131 if ((error = namei(&nd)) != 0) 2132 return (error); 2133 2134 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2135 2136 vrele(nd.ni_vp); 2137 return (error); 2138 } 2139 2140 /* 2141 * Change mode of a file given a file descriptor. 2142 */ 2143 /* ARGSUSED */ 2144 int 2145 sys_fchmod(p, v, retval) 2146 struct proc *p; 2147 void *v; 2148 register_t *retval; 2149 { 2150 register struct sys_fchmod_args /* { 2151 syscallarg(int) fd; 2152 syscallarg(int) mode; 2153 } */ *uap = v; 2154 struct file *fp; 2155 int error; 2156 2157 /* getvnode() will use the descriptor for us */ 2158 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2159 return (error); 2160 2161 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2162 FILE_UNUSE(fp, p); 2163 return (error); 2164 } 2165 2166 /* 2167 * Change mode of a file given path name; this version does not follow links. 2168 */ 2169 /* ARGSUSED */ 2170 int 2171 sys_lchmod(p, v, retval) 2172 struct proc *p; 2173 void *v; 2174 register_t *retval; 2175 { 2176 register struct sys_lchmod_args /* { 2177 syscallarg(const char *) path; 2178 syscallarg(int) mode; 2179 } */ *uap = v; 2180 int error; 2181 struct nameidata nd; 2182 2183 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2184 if ((error = namei(&nd)) != 0) 2185 return (error); 2186 2187 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2188 2189 vrele(nd.ni_vp); 2190 return (error); 2191 } 2192 2193 /* 2194 * Common routine to set mode given a vnode. 2195 */ 2196 static int 2197 change_mode(vp, mode, p) 2198 struct vnode *vp; 2199 int mode; 2200 struct proc *p; 2201 { 2202 struct vattr vattr; 2203 int error; 2204 2205 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2206 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2207 VATTR_NULL(&vattr); 2208 vattr.va_mode = mode & ALLPERMS; 2209 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2210 VOP_UNLOCK(vp, 0); 2211 return (error); 2212 } 2213 2214 /* 2215 * Set ownership given a path name; this version follows links. 2216 */ 2217 /* ARGSUSED */ 2218 int 2219 sys_chown(p, v, retval) 2220 struct proc *p; 2221 void *v; 2222 register_t *retval; 2223 { 2224 register struct sys_chown_args /* { 2225 syscallarg(const char *) path; 2226 syscallarg(uid_t) uid; 2227 syscallarg(gid_t) gid; 2228 } */ *uap = v; 2229 int error; 2230 struct nameidata nd; 2231 2232 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2233 if ((error = namei(&nd)) != 0) 2234 return (error); 2235 2236 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2237 2238 vrele(nd.ni_vp); 2239 return (error); 2240 } 2241 2242 /* 2243 * Set ownership given a path name; this version follows links. 2244 * Provides POSIX semantics. 2245 */ 2246 /* ARGSUSED */ 2247 int 2248 sys___posix_chown(p, v, retval) 2249 struct proc *p; 2250 void *v; 2251 register_t *retval; 2252 { 2253 register struct sys_chown_args /* { 2254 syscallarg(const char *) path; 2255 syscallarg(uid_t) uid; 2256 syscallarg(gid_t) gid; 2257 } */ *uap = v; 2258 int error; 2259 struct nameidata nd; 2260 2261 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2262 if ((error = namei(&nd)) != 0) 2263 return (error); 2264 2265 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2266 2267 vrele(nd.ni_vp); 2268 return (error); 2269 } 2270 2271 /* 2272 * Set ownership given a file descriptor. 2273 */ 2274 /* ARGSUSED */ 2275 int 2276 sys_fchown(p, v, retval) 2277 struct proc *p; 2278 void *v; 2279 register_t *retval; 2280 { 2281 register struct sys_fchown_args /* { 2282 syscallarg(int) fd; 2283 syscallarg(uid_t) uid; 2284 syscallarg(gid_t) gid; 2285 } */ *uap = v; 2286 int error; 2287 struct file *fp; 2288 2289 /* getvnode() will use the descriptor for us */ 2290 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2291 return (error); 2292 2293 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2294 SCARG(uap, gid), p, 0); 2295 FILE_UNUSE(fp, p); 2296 return (error); 2297 } 2298 2299 /* 2300 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2301 */ 2302 /* ARGSUSED */ 2303 int 2304 sys___posix_fchown(p, v, retval) 2305 struct proc *p; 2306 void *v; 2307 register_t *retval; 2308 { 2309 register struct sys_fchown_args /* { 2310 syscallarg(int) fd; 2311 syscallarg(uid_t) uid; 2312 syscallarg(gid_t) gid; 2313 } */ *uap = v; 2314 int error; 2315 struct file *fp; 2316 2317 /* getvnode() will use the descriptor for us */ 2318 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2319 return (error); 2320 2321 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2322 SCARG(uap, gid), p, 1); 2323 FILE_UNUSE(fp, p); 2324 return (error); 2325 } 2326 2327 /* 2328 * Set ownership given a path name; this version does not follow links. 2329 */ 2330 /* ARGSUSED */ 2331 int 2332 sys_lchown(p, v, retval) 2333 struct proc *p; 2334 void *v; 2335 register_t *retval; 2336 { 2337 register struct sys_lchown_args /* { 2338 syscallarg(const char *) path; 2339 syscallarg(uid_t) uid; 2340 syscallarg(gid_t) gid; 2341 } */ *uap = v; 2342 int error; 2343 struct nameidata nd; 2344 2345 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2346 if ((error = namei(&nd)) != 0) 2347 return (error); 2348 2349 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2350 2351 vrele(nd.ni_vp); 2352 return (error); 2353 } 2354 2355 /* 2356 * Set ownership given a path name; this version does not follow links. 2357 * Provides POSIX/XPG semantics. 2358 */ 2359 /* ARGSUSED */ 2360 int 2361 sys___posix_lchown(p, v, retval) 2362 struct proc *p; 2363 void *v; 2364 register_t *retval; 2365 { 2366 register struct sys_lchown_args /* { 2367 syscallarg(const char *) path; 2368 syscallarg(uid_t) uid; 2369 syscallarg(gid_t) gid; 2370 } */ *uap = v; 2371 int error; 2372 struct nameidata nd; 2373 2374 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2375 if ((error = namei(&nd)) != 0) 2376 return (error); 2377 2378 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2379 2380 vrele(nd.ni_vp); 2381 return (error); 2382 } 2383 2384 /* 2385 * Common routine to set ownership given a vnode. 2386 */ 2387 static int 2388 change_owner(vp, uid, gid, p, posix_semantics) 2389 register struct vnode *vp; 2390 uid_t uid; 2391 gid_t gid; 2392 struct proc *p; 2393 int posix_semantics; 2394 { 2395 struct vattr vattr; 2396 mode_t newmode; 2397 int error; 2398 2399 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2400 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2401 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2402 goto out; 2403 2404 #define CHANGED(x) ((x) != -1) 2405 newmode = vattr.va_mode; 2406 if (posix_semantics) { 2407 /* 2408 * POSIX/XPG semantics: if the caller is not the super-user, 2409 * clear set-user-id and set-group-id bits. Both POSIX and 2410 * the XPG consider the behaviour for calls by the super-user 2411 * implementation-defined; we leave the set-user-id and set- 2412 * group-id settings intact in that case. 2413 */ 2414 if (suser(p->p_ucred, NULL) != 0) 2415 newmode &= ~(S_ISUID | S_ISGID); 2416 } else { 2417 /* 2418 * NetBSD semantics: when changing owner and/or group, 2419 * clear the respective bit(s). 2420 */ 2421 if (CHANGED(uid)) 2422 newmode &= ~S_ISUID; 2423 if (CHANGED(gid)) 2424 newmode &= ~S_ISGID; 2425 } 2426 /* Update va_mode iff altered. */ 2427 if (vattr.va_mode == newmode) 2428 newmode = VNOVAL; 2429 2430 VATTR_NULL(&vattr); 2431 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2432 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2433 vattr.va_mode = newmode; 2434 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2435 #undef CHANGED 2436 2437 out: 2438 VOP_UNLOCK(vp, 0); 2439 return (error); 2440 } 2441 2442 /* 2443 * Set the access and modification times given a path name; this 2444 * version follows links. 2445 */ 2446 /* ARGSUSED */ 2447 int 2448 sys_utimes(p, v, retval) 2449 struct proc *p; 2450 void *v; 2451 register_t *retval; 2452 { 2453 register struct sys_utimes_args /* { 2454 syscallarg(const char *) path; 2455 syscallarg(const struct timeval *) tptr; 2456 } */ *uap = v; 2457 int error; 2458 struct nameidata nd; 2459 2460 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2461 if ((error = namei(&nd)) != 0) 2462 return (error); 2463 2464 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2465 2466 vrele(nd.ni_vp); 2467 return (error); 2468 } 2469 2470 /* 2471 * Set the access and modification times given a file descriptor. 2472 */ 2473 /* ARGSUSED */ 2474 int 2475 sys_futimes(p, v, retval) 2476 struct proc *p; 2477 void *v; 2478 register_t *retval; 2479 { 2480 register struct sys_futimes_args /* { 2481 syscallarg(int) fd; 2482 syscallarg(const struct timeval *) tptr; 2483 } */ *uap = v; 2484 int error; 2485 struct file *fp; 2486 2487 /* getvnode() will use the descriptor for us */ 2488 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2489 return (error); 2490 2491 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2492 FILE_UNUSE(fp, p); 2493 return (error); 2494 } 2495 2496 /* 2497 * Set the access and modification times given a path name; this 2498 * version does not follow links. 2499 */ 2500 /* ARGSUSED */ 2501 int 2502 sys_lutimes(p, v, retval) 2503 struct proc *p; 2504 void *v; 2505 register_t *retval; 2506 { 2507 register struct sys_lutimes_args /* { 2508 syscallarg(const char *) path; 2509 syscallarg(const struct timeval *) tptr; 2510 } */ *uap = v; 2511 int error; 2512 struct nameidata nd; 2513 2514 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2515 if ((error = namei(&nd)) != 0) 2516 return (error); 2517 2518 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2519 2520 vrele(nd.ni_vp); 2521 return (error); 2522 } 2523 2524 /* 2525 * Common routine to set access and modification times given a vnode. 2526 */ 2527 static int 2528 change_utimes(vp, tptr, p) 2529 struct vnode *vp; 2530 const struct timeval *tptr; 2531 struct proc *p; 2532 { 2533 struct timeval tv[2]; 2534 struct vattr vattr; 2535 int error; 2536 2537 VATTR_NULL(&vattr); 2538 if (tptr == NULL) { 2539 microtime(&tv[0]); 2540 tv[1] = tv[0]; 2541 vattr.va_vaflags |= VA_UTIMES_NULL; 2542 } else { 2543 error = copyin(tptr, tv, sizeof(tv)); 2544 if (error) 2545 return (error); 2546 } 2547 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2548 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2549 vattr.va_atime.tv_sec = tv[0].tv_sec; 2550 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2551 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2552 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2553 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2554 VOP_UNLOCK(vp, 0); 2555 return (error); 2556 } 2557 2558 /* 2559 * Truncate a file given its path name. 2560 */ 2561 /* ARGSUSED */ 2562 int 2563 sys_truncate(p, v, retval) 2564 struct proc *p; 2565 void *v; 2566 register_t *retval; 2567 { 2568 register struct sys_truncate_args /* { 2569 syscallarg(const char *) path; 2570 syscallarg(int) pad; 2571 syscallarg(off_t) length; 2572 } */ *uap = v; 2573 register struct vnode *vp; 2574 struct vattr vattr; 2575 int error; 2576 struct nameidata nd; 2577 2578 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2579 if ((error = namei(&nd)) != 0) 2580 return (error); 2581 vp = nd.ni_vp; 2582 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2583 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2584 if (vp->v_type == VDIR) 2585 error = EISDIR; 2586 else if ((error = vn_writechk(vp)) == 0 && 2587 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2588 VATTR_NULL(&vattr); 2589 vattr.va_size = SCARG(uap, length); 2590 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2591 } 2592 vput(vp); 2593 return (error); 2594 } 2595 2596 /* 2597 * Truncate a file given a file descriptor. 2598 */ 2599 /* ARGSUSED */ 2600 int 2601 sys_ftruncate(p, v, retval) 2602 struct proc *p; 2603 void *v; 2604 register_t *retval; 2605 { 2606 register struct sys_ftruncate_args /* { 2607 syscallarg(int) fd; 2608 syscallarg(int) pad; 2609 syscallarg(off_t) length; 2610 } */ *uap = v; 2611 struct vattr vattr; 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 if ((fp->f_flag & FWRITE) == 0) { 2620 error = EINVAL; 2621 goto out; 2622 } 2623 vp = (struct vnode *)fp->f_data; 2624 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2625 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2626 if (vp->v_type == VDIR) 2627 error = EISDIR; 2628 else if ((error = vn_writechk(vp)) == 0) { 2629 VATTR_NULL(&vattr); 2630 vattr.va_size = SCARG(uap, length); 2631 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2632 } 2633 VOP_UNLOCK(vp, 0); 2634 out: 2635 FILE_UNUSE(fp, p); 2636 return (error); 2637 } 2638 2639 /* 2640 * Sync an open file. 2641 */ 2642 /* ARGSUSED */ 2643 int 2644 sys_fsync(p, v, retval) 2645 struct proc *p; 2646 void *v; 2647 register_t *retval; 2648 { 2649 struct sys_fsync_args /* { 2650 syscallarg(int) fd; 2651 } */ *uap = v; 2652 register struct vnode *vp; 2653 struct file *fp; 2654 int error; 2655 2656 /* getvnode() will use the descriptor for us */ 2657 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2658 return (error); 2659 vp = (struct vnode *)fp->f_data; 2660 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2661 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2662 if (error == 0 && bioops.io_fsync != NULL) 2663 (*bioops.io_fsync)(vp); 2664 VOP_UNLOCK(vp, 0); 2665 FILE_UNUSE(fp, p); 2666 return (error); 2667 } 2668 2669 /* 2670 * Sync the data of an open file. 2671 */ 2672 /* ARGSUSED */ 2673 int 2674 sys_fdatasync(p, v, retval) 2675 struct proc *p; 2676 void *v; 2677 register_t *retval; 2678 { 2679 struct sys_fdatasync_args /* { 2680 syscallarg(int) fd; 2681 } */ *uap = v; 2682 struct vnode *vp; 2683 struct file *fp; 2684 int error; 2685 2686 /* getvnode() will use the descriptor for us */ 2687 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2688 return (error); 2689 vp = (struct vnode *)fp->f_data; 2690 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2691 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2692 if (error == 0 && bioops.io_fsync != NULL) 2693 (*bioops.io_fsync)(vp); 2694 VOP_UNLOCK(vp, 0); 2695 FILE_UNUSE(fp, p); 2696 return (error); 2697 } 2698 2699 /* 2700 * Rename files, (standard) BSD semantics frontend. 2701 */ 2702 /* ARGSUSED */ 2703 int 2704 sys_rename(p, v, retval) 2705 struct proc *p; 2706 void *v; 2707 register_t *retval; 2708 { 2709 register struct sys_rename_args /* { 2710 syscallarg(const char *) from; 2711 syscallarg(const char *) to; 2712 } */ *uap = v; 2713 2714 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2715 } 2716 2717 /* 2718 * Rename files, POSIX semantics frontend. 2719 */ 2720 /* ARGSUSED */ 2721 int 2722 sys___posix_rename(p, v, retval) 2723 struct proc *p; 2724 void *v; 2725 register_t *retval; 2726 { 2727 register struct sys___posix_rename_args /* { 2728 syscallarg(const char *) from; 2729 syscallarg(const char *) to; 2730 } */ *uap = v; 2731 2732 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2733 } 2734 2735 /* 2736 * Rename files. Source and destination must either both be directories, 2737 * or both not be directories. If target is a directory, it must be empty. 2738 * If `from' and `to' refer to the same object, the value of the `retain' 2739 * argument is used to determine whether `from' will be 2740 * 2741 * (retain == 0) deleted unless `from' and `to' refer to the same 2742 * object in the file system's name space (BSD). 2743 * (retain == 1) always retained (POSIX). 2744 */ 2745 static int 2746 rename_files(from, to, p, retain) 2747 const char *from, *to; 2748 struct proc *p; 2749 int retain; 2750 { 2751 register struct vnode *tvp, *fvp, *tdvp; 2752 struct nameidata fromnd, tond; 2753 int error; 2754 2755 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2756 from, p); 2757 if ((error = namei(&fromnd)) != 0) 2758 return (error); 2759 fvp = fromnd.ni_vp; 2760 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2761 UIO_USERSPACE, to, p); 2762 if ((error = namei(&tond)) != 0) { 2763 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2764 vrele(fromnd.ni_dvp); 2765 vrele(fvp); 2766 goto out1; 2767 } 2768 tdvp = tond.ni_dvp; 2769 tvp = tond.ni_vp; 2770 2771 if (tvp != NULL) { 2772 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2773 error = ENOTDIR; 2774 goto out; 2775 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2776 error = EISDIR; 2777 goto out; 2778 } 2779 } 2780 2781 if (fvp == tdvp) 2782 error = EINVAL; 2783 2784 /* 2785 * Source and destination refer to the same object. 2786 */ 2787 if (fvp == tvp) { 2788 if (retain) 2789 error = -1; 2790 else if (fromnd.ni_dvp == tdvp && 2791 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2792 !memcmp(fromnd.ni_cnd.cn_nameptr, 2793 tond.ni_cnd.cn_nameptr, 2794 fromnd.ni_cnd.cn_namelen)) 2795 error = -1; 2796 } 2797 2798 out: 2799 if (!error) { 2800 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2801 if (fromnd.ni_dvp != tdvp) 2802 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2803 if (tvp) { 2804 (void)uvm_vnp_uncache(tvp); 2805 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2806 } 2807 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2808 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2809 } else { 2810 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2811 if (tdvp == tvp) 2812 vrele(tdvp); 2813 else 2814 vput(tdvp); 2815 if (tvp) 2816 vput(tvp); 2817 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2818 vrele(fromnd.ni_dvp); 2819 vrele(fvp); 2820 } 2821 vrele(tond.ni_startdir); 2822 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2823 out1: 2824 if (fromnd.ni_startdir) 2825 vrele(fromnd.ni_startdir); 2826 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2827 return (error == -1 ? 0 : error); 2828 } 2829 2830 /* 2831 * Make a directory file. 2832 */ 2833 /* ARGSUSED */ 2834 int 2835 sys_mkdir(p, v, retval) 2836 struct proc *p; 2837 void *v; 2838 register_t *retval; 2839 { 2840 register struct sys_mkdir_args /* { 2841 syscallarg(const char *) path; 2842 syscallarg(int) mode; 2843 } */ *uap = v; 2844 register struct vnode *vp; 2845 struct vattr vattr; 2846 int error; 2847 struct nameidata nd; 2848 2849 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2850 if ((error = namei(&nd)) != 0) 2851 return (error); 2852 vp = nd.ni_vp; 2853 if (vp != NULL) { 2854 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2855 if (nd.ni_dvp == vp) 2856 vrele(nd.ni_dvp); 2857 else 2858 vput(nd.ni_dvp); 2859 vrele(vp); 2860 return (EEXIST); 2861 } 2862 VATTR_NULL(&vattr); 2863 vattr.va_type = VDIR; 2864 vattr.va_mode = 2865 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2866 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2867 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2868 if (!error) 2869 vput(nd.ni_vp); 2870 return (error); 2871 } 2872 2873 /* 2874 * Remove a directory file. 2875 */ 2876 /* ARGSUSED */ 2877 int 2878 sys_rmdir(p, v, retval) 2879 struct proc *p; 2880 void *v; 2881 register_t *retval; 2882 { 2883 struct sys_rmdir_args /* { 2884 syscallarg(const char *) path; 2885 } */ *uap = v; 2886 register struct vnode *vp; 2887 int error; 2888 struct nameidata nd; 2889 2890 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2891 SCARG(uap, path), p); 2892 if ((error = namei(&nd)) != 0) 2893 return (error); 2894 vp = nd.ni_vp; 2895 if (vp->v_type != VDIR) { 2896 error = ENOTDIR; 2897 goto out; 2898 } 2899 /* 2900 * No rmdir "." please. 2901 */ 2902 if (nd.ni_dvp == vp) { 2903 error = EINVAL; 2904 goto out; 2905 } 2906 /* 2907 * The root of a mounted filesystem cannot be deleted. 2908 */ 2909 if (vp->v_flag & VROOT) 2910 error = EBUSY; 2911 out: 2912 if (!error) { 2913 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2914 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2915 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2916 } else { 2917 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2918 if (nd.ni_dvp == vp) 2919 vrele(nd.ni_dvp); 2920 else 2921 vput(nd.ni_dvp); 2922 vput(vp); 2923 } 2924 return (error); 2925 } 2926 2927 /* 2928 * Read a block of directory entries in a file system independent format. 2929 */ 2930 int 2931 sys_getdents(p, v, retval) 2932 struct proc *p; 2933 void *v; 2934 register_t *retval; 2935 { 2936 register struct sys_getdents_args /* { 2937 syscallarg(int) fd; 2938 syscallarg(char *) buf; 2939 syscallarg(size_t) count; 2940 } */ *uap = v; 2941 struct file *fp; 2942 int error, done; 2943 2944 /* getvnode() will use the descriptor for us */ 2945 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2946 return (error); 2947 if ((fp->f_flag & FREAD) == 0) { 2948 error = EBADF; 2949 goto out; 2950 } 2951 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2952 SCARG(uap, count), &done, p, 0, 0); 2953 *retval = done; 2954 out: 2955 FILE_UNUSE(fp, p); 2956 return (error); 2957 } 2958 2959 /* 2960 * Set the mode mask for creation of filesystem nodes. 2961 */ 2962 int 2963 sys_umask(p, v, retval) 2964 struct proc *p; 2965 void *v; 2966 register_t *retval; 2967 { 2968 struct sys_umask_args /* { 2969 syscallarg(mode_t) newmask; 2970 } */ *uap = v; 2971 struct cwdinfo *cwdi; 2972 2973 cwdi = p->p_cwdi; 2974 *retval = cwdi->cwdi_cmask; 2975 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2976 return (0); 2977 } 2978 2979 /* 2980 * Void all references to file by ripping underlying filesystem 2981 * away from vnode. 2982 */ 2983 /* ARGSUSED */ 2984 int 2985 sys_revoke(p, v, retval) 2986 struct proc *p; 2987 void *v; 2988 register_t *retval; 2989 { 2990 register struct sys_revoke_args /* { 2991 syscallarg(const char *) path; 2992 } */ *uap = v; 2993 register struct vnode *vp; 2994 struct vattr vattr; 2995 int error; 2996 struct nameidata nd; 2997 2998 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2999 if ((error = namei(&nd)) != 0) 3000 return (error); 3001 vp = nd.ni_vp; 3002 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3003 goto out; 3004 if (p->p_ucred->cr_uid != vattr.va_uid && 3005 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3006 goto out; 3007 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3008 VOP_REVOKE(vp, REVOKEALL); 3009 out: 3010 vrele(vp); 3011 return (error); 3012 } 3013 3014 /* 3015 * Convert a user file descriptor to a kernel file entry. 3016 */ 3017 int 3018 getvnode(fdp, fd, fpp) 3019 struct filedesc *fdp; 3020 int fd; 3021 struct file **fpp; 3022 { 3023 struct vnode *vp; 3024 struct file *fp; 3025 3026 if ((u_int)fd >= fdp->fd_nfiles || 3027 (fp = fdp->fd_ofiles[fd]) == NULL || 3028 (fp->f_iflags & FIF_WANTCLOSE) != 0) 3029 return (EBADF); 3030 3031 FILE_USE(fp); 3032 3033 if (fp->f_type != DTYPE_VNODE) { 3034 FILE_UNUSE(fp, NULL); 3035 return (EINVAL); 3036 } 3037 3038 vp = (struct vnode *)fp->f_data; 3039 if (vp->v_type == VBAD) { 3040 FILE_UNUSE(fp, NULL); 3041 return (EBADF); 3042 } 3043 3044 *fpp = fp; 3045 return (0); 3046 } 3047
Indexes created Fri Oct 03 02:09:57 GMT 2025