vfs_syscalls.c revision 1.147.4.5
1 /* $NetBSD: vfs_syscalls.c,v 1.147.4.5 1999/10/26 19:15:17 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 mp->mnt_unmounter = NULL; 298 update: 299 /* 300 * Set the mount level flags. 301 */ 302 if (SCARG(uap, flags) & MNT_RDONLY) 303 mp->mnt_flag |= MNT_RDONLY; 304 else if (mp->mnt_flag & MNT_RDONLY) 305 mp->mnt_flag |= MNT_WANTRDWR; 306 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 307 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 308 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 309 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 310 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 311 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 312 /* 313 * Mount the filesystem. 314 */ 315 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 316 if (mp->mnt_flag & MNT_UPDATE) { 317 vrele(vp); 318 if (mp->mnt_flag & MNT_WANTRDWR) 319 mp->mnt_flag &= ~MNT_RDONLY; 320 mp->mnt_flag &=~ 321 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 322 if (error) 323 mp->mnt_flag = flag; 324 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 325 if (mp->mnt_syncer == NULL) 326 error = vfs_allocate_syncvnode(mp); 327 } else { 328 if (mp->mnt_syncer != NULL) 329 vgone(mp->mnt_syncer); 330 mp->mnt_syncer = NULL; 331 } 332 vfs_unbusy(mp); 333 return (error); 334 } 335 /* 336 * Put the new filesystem on the mount list after root. 337 */ 338 cache_purge(vp); 339 if (!error) { 340 vp->v_mountedhere = mp; 341 simple_lock(&mountlist_slock); 342 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 343 simple_unlock(&mountlist_slock); 344 checkdirs(vp); 345 VOP_UNLOCK(vp, 0); 346 if ((mp->mnt_flag & MNT_RDONLY) == 0) 347 error = vfs_allocate_syncvnode(mp); 348 vfs_unbusy(mp); 349 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 350 if ((error = VFS_START(mp, 0, p))) 351 vrele(vp); 352 } else { 353 vp->v_mountedhere = (struct mount *)0; 354 vfs->vfs_refcount--; 355 vfs_unbusy(mp); 356 free((caddr_t)mp, M_MOUNT); 357 vput(vp); 358 } 359 return (error); 360 } 361 362 /* 363 * Scan all active processes to see if any of them have a current 364 * or root directory onto which the new filesystem has just been 365 * mounted. If so, replace them with the new mount point. 366 */ 367 void 368 checkdirs(olddp) 369 struct vnode *olddp; 370 { 371 struct cwdinfo *cwdi; 372 struct vnode *newdp; 373 struct proc *p; 374 375 if (olddp->v_usecount == 1) 376 return; 377 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 378 panic("mount: lost mount"); 379 proclist_lock_read(); 380 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 381 cwdi = p->p_cwdi; 382 if (cwdi->cwdi_cdir == olddp) { 383 vrele(cwdi->cwdi_cdir); 384 VREF(newdp); 385 cwdi->cwdi_cdir = newdp; 386 } 387 if (cwdi->cwdi_rdir == olddp) { 388 vrele(cwdi->cwdi_rdir); 389 VREF(newdp); 390 cwdi->cwdi_rdir = newdp; 391 } 392 } 393 proclist_unlock_read(); 394 if (rootvnode == olddp) { 395 vrele(rootvnode); 396 VREF(newdp); 397 rootvnode = newdp; 398 } 399 vput(newdp); 400 } 401 402 /* 403 * Unmount a file system. 404 * 405 * Note: unmount takes a path to the vnode mounted on as argument, 406 * not special file (as before). 407 */ 408 /* ARGSUSED */ 409 int 410 sys_unmount(p, v, retval) 411 struct proc *p; 412 void *v; 413 register_t *retval; 414 { 415 register struct sys_unmount_args /* { 416 syscallarg(const char *) path; 417 syscallarg(int) flags; 418 } */ *uap = v; 419 register struct vnode *vp; 420 struct mount *mp; 421 int error; 422 struct nameidata nd; 423 424 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 425 SCARG(uap, path), p); 426 if ((error = namei(&nd)) != 0) 427 return (error); 428 vp = nd.ni_vp; 429 mp = vp->v_mount; 430 431 /* 432 * Only root, or the user that did the original mount is 433 * permitted to unmount this filesystem. 434 */ 435 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 436 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 437 vput(vp); 438 return (error); 439 } 440 441 /* 442 * Don't allow unmounting the root file system. 443 */ 444 if (mp->mnt_flag & MNT_ROOTFS) { 445 vput(vp); 446 return (EINVAL); 447 } 448 449 /* 450 * Must be the root of the filesystem 451 */ 452 if ((vp->v_flag & VROOT) == 0) { 453 vput(vp); 454 return (EINVAL); 455 } 456 vput(vp); 457 458 if (vfs_busy(mp, 0, 0)) 459 return (EBUSY); 460 461 return (dounmount(mp, SCARG(uap, flags), p)); 462 } 463 464 /* 465 * Do the actual file system unmount. File system is assumed to have been 466 * marked busy by the caller. 467 */ 468 int 469 dounmount(mp, flags, p) 470 register struct mount *mp; 471 int flags; 472 struct proc *p; 473 { 474 struct vnode *coveredvp; 475 int error; 476 int async; 477 478 simple_lock(&mountlist_slock); 479 vfs_unbusy(mp); 480 /* 481 * XXX Freeze syncer. This should really be done on a mountpoint 482 * basis, but especially the softdep code possibly called from 483 * the syncer doesn't exactly work on a per-mountpoint basis, 484 * so the softdep code would become a maze of vfs_busy calls. 485 */ 486 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 487 488 mp->mnt_flag |= MNT_UNMOUNT; 489 mp->mnt_unmounter = p; 490 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 491 if (mp->mnt_flag & MNT_EXPUBLIC) 492 vfs_setpublicfs(NULL, NULL, NULL); 493 async = mp->mnt_flag & MNT_ASYNC; 494 mp->mnt_flag &=~ MNT_ASYNC; 495 cache_purgevfs(mp); /* remove cache entries for this file sys */ 496 if (mp->mnt_syncer != NULL) 497 vgone(mp->mnt_syncer); 498 if (((mp->mnt_flag & MNT_RDONLY) || 499 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 500 (flags & MNT_FORCE)) 501 error = VFS_UNMOUNT(mp, flags, p); 502 simple_lock(&mountlist_slock); 503 if (error) { 504 if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL) 505 (void) vfs_allocate_syncvnode(mp); 506 mp->mnt_flag &= ~MNT_UNMOUNT; 507 mp->mnt_unmounter = NULL; 508 mp->mnt_flag |= async; 509 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 510 &mountlist_slock); 511 lockmgr(&syncer_lock, LK_RELEASE, NULL); 512 while(mp->mnt_wcnt > 0) { 513 wakeup((caddr_t)mp); 514 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 515 } 516 return (error); 517 } 518 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 519 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 520 coveredvp->v_mountedhere = NULL; 521 vrele(coveredvp); 522 } 523 mp->mnt_op->vfs_refcount--; 524 if (mp->mnt_vnodelist.lh_first != NULL) 525 panic("unmount: dangling vnode"); 526 mp->mnt_flag |= MNT_GONE; 527 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 528 lockmgr(&syncer_lock, LK_RELEASE, NULL); 529 while(mp->mnt_wcnt > 0) { 530 wakeup((caddr_t)mp); 531 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 532 } 533 free((caddr_t)mp, M_MOUNT); 534 return (0); 535 } 536 537 /* 538 * Sync each mounted filesystem. 539 */ 540 #ifdef DEBUG 541 int syncprt = 0; 542 struct ctldebug debug0 = { "syncprt", &syncprt }; 543 #endif 544 545 /* ARGSUSED */ 546 int 547 sys_sync(p, v, retval) 548 struct proc *p; 549 void *v; 550 register_t *retval; 551 { 552 register struct mount *mp, *nmp; 553 int asyncflag; 554 555 simple_lock(&mountlist_slock); 556 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 557 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 558 nmp = mp->mnt_list.cqe_prev; 559 continue; 560 } 561 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 562 asyncflag = mp->mnt_flag & MNT_ASYNC; 563 mp->mnt_flag &= ~MNT_ASYNC; 564 uvm_vnp_sync(mp); 565 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 566 if (asyncflag) 567 mp->mnt_flag |= MNT_ASYNC; 568 } 569 simple_lock(&mountlist_slock); 570 nmp = mp->mnt_list.cqe_prev; 571 vfs_unbusy(mp); 572 573 } 574 simple_unlock(&mountlist_slock); 575 #ifdef DEBUG 576 if (syncprt) 577 vfs_bufstats(); 578 #endif /* DEBUG */ 579 return (0); 580 } 581 582 /* 583 * Change filesystem quotas. 584 */ 585 /* ARGSUSED */ 586 int 587 sys_quotactl(p, v, retval) 588 struct proc *p; 589 void *v; 590 register_t *retval; 591 { 592 register struct sys_quotactl_args /* { 593 syscallarg(const char *) path; 594 syscallarg(int) cmd; 595 syscallarg(int) uid; 596 syscallarg(caddr_t) arg; 597 } */ *uap = v; 598 register struct mount *mp; 599 int error; 600 struct nameidata nd; 601 602 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 603 if ((error = namei(&nd)) != 0) 604 return (error); 605 mp = nd.ni_vp->v_mount; 606 vrele(nd.ni_vp); 607 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 608 SCARG(uap, arg), p)); 609 } 610 611 /* 612 * Get filesystem statistics. 613 */ 614 /* ARGSUSED */ 615 int 616 sys_statfs(p, v, retval) 617 struct proc *p; 618 void *v; 619 register_t *retval; 620 { 621 register struct sys_statfs_args /* { 622 syscallarg(const char *) path; 623 syscallarg(struct statfs *) buf; 624 } */ *uap = v; 625 register struct mount *mp; 626 register struct statfs *sp; 627 int error; 628 struct nameidata nd; 629 630 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 631 if ((error = namei(&nd)) != 0) 632 return (error); 633 mp = nd.ni_vp->v_mount; 634 sp = &mp->mnt_stat; 635 vrele(nd.ni_vp); 636 if ((error = VFS_STATFS(mp, sp, p)) != 0) 637 return (error); 638 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 639 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 640 } 641 642 /* 643 * Get filesystem statistics. 644 */ 645 /* ARGSUSED */ 646 int 647 sys_fstatfs(p, v, retval) 648 struct proc *p; 649 void *v; 650 register_t *retval; 651 { 652 register struct sys_fstatfs_args /* { 653 syscallarg(int) fd; 654 syscallarg(struct statfs *) buf; 655 } */ *uap = v; 656 struct file *fp; 657 struct mount *mp; 658 register struct statfs *sp; 659 int error; 660 661 /* getvnode() will use the descriptor for us */ 662 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 663 return (error); 664 mp = ((struct vnode *)fp->f_data)->v_mount; 665 sp = &mp->mnt_stat; 666 if ((error = VFS_STATFS(mp, sp, p)) != 0) 667 goto out; 668 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 669 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 670 out: 671 FILE_UNUSE(fp, p); 672 return (error); 673 } 674 675 /* 676 * Get statistics on all filesystems. 677 */ 678 int 679 sys_getfsstat(p, v, retval) 680 struct proc *p; 681 void *v; 682 register_t *retval; 683 { 684 register struct sys_getfsstat_args /* { 685 syscallarg(struct statfs *) buf; 686 syscallarg(long) bufsize; 687 syscallarg(int) flags; 688 } */ *uap = v; 689 register struct mount *mp, *nmp; 690 register struct statfs *sp; 691 caddr_t sfsp; 692 long count, maxcount, error; 693 694 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 695 sfsp = (caddr_t)SCARG(uap, buf); 696 simple_lock(&mountlist_slock); 697 count = 0; 698 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 699 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 700 nmp = mp->mnt_list.cqe_next; 701 continue; 702 } 703 if (sfsp && count < maxcount) { 704 sp = &mp->mnt_stat; 705 /* 706 * If MNT_NOWAIT or MNT_LAZY is specified, do not 707 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 708 * overrides MNT_NOWAIT. 709 */ 710 if (SCARG(uap, flags) != MNT_NOWAIT && 711 SCARG(uap, flags) != MNT_LAZY && 712 (SCARG(uap, flags) == MNT_WAIT || 713 SCARG(uap, flags) == 0) && 714 (error = VFS_STATFS(mp, sp, p)) != 0) { 715 simple_lock(&mountlist_slock); 716 nmp = mp->mnt_list.cqe_next; 717 vfs_unbusy(mp); 718 continue; 719 } 720 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 721 error = copyout(sp, sfsp, sizeof(*sp)); 722 if (error) { 723 vfs_unbusy(mp); 724 return (error); 725 } 726 sfsp += sizeof(*sp); 727 } 728 count++; 729 simple_lock(&mountlist_slock); 730 nmp = mp->mnt_list.cqe_next; 731 vfs_unbusy(mp); 732 } 733 simple_unlock(&mountlist_slock); 734 if (sfsp && count > maxcount) 735 *retval = maxcount; 736 else 737 *retval = count; 738 return (0); 739 } 740 741 /* 742 * Change current working directory to a given file descriptor. 743 */ 744 /* ARGSUSED */ 745 int 746 sys_fchdir(p, v, retval) 747 struct proc *p; 748 void *v; 749 register_t *retval; 750 { 751 struct sys_fchdir_args /* { 752 syscallarg(int) fd; 753 } */ *uap = v; 754 struct filedesc *fdp = p->p_fd; 755 struct cwdinfo *cwdi = p->p_cwdi; 756 struct vnode *vp, *tdp; 757 struct mount *mp; 758 struct file *fp; 759 int error; 760 761 /* getvnode() will use the descriptor for us */ 762 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 763 return (error); 764 vp = (struct vnode *)fp->f_data; 765 766 VREF(vp); 767 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 768 if (vp->v_type != VDIR) 769 error = ENOTDIR; 770 else 771 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 772 while (!error && (mp = vp->v_mountedhere) != NULL) { 773 if (vfs_busy(mp, 0, 0)) 774 continue; 775 error = VFS_ROOT(mp, &tdp); 776 vfs_unbusy(mp); 777 if (error) 778 break; 779 vput(vp); 780 vp = tdp; 781 } 782 if (error) { 783 vput(vp); 784 goto out; 785 } 786 VOP_UNLOCK(vp, 0); 787 788 /* 789 * Disallow changing to a directory not under the process's 790 * current root directory (if there is one). 791 */ 792 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 793 vrele(vp); 794 error = EPERM; /* operation not permitted */ 795 goto out; 796 } 797 798 vrele(cwdi->cwdi_cdir); 799 cwdi->cwdi_cdir = vp; 800 out: 801 FILE_UNUSE(fp, p); 802 return (error); 803 } 804 805 /* 806 * Change this process's notion of the root directory to a given file descriptor. 807 */ 808 809 int 810 sys_fchroot(p, v, retval) 811 struct proc *p; 812 void *v; 813 register_t *retval; 814 { 815 struct sys_fchroot_args *uap = v; 816 struct filedesc *fdp = p->p_fd; 817 struct cwdinfo *cwdi = p->p_cwdi; 818 struct vnode *vp; 819 struct file *fp; 820 int error; 821 822 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 823 return error; 824 /* getvnode() will use the descriptor for us */ 825 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 826 return error; 827 vp = (struct vnode *) fp->f_data; 828 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 829 if (vp->v_type != VDIR) 830 error = ENOTDIR; 831 else 832 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 833 VOP_UNLOCK(vp, 0); 834 if (error) 835 goto out; 836 VREF(vp); 837 838 /* 839 * Prevent escaping from chroot by putting the root under 840 * the working directory. Silently chdir to / if we aren't 841 * already there. 842 */ 843 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 844 /* 845 * XXX would be more failsafe to change directory to a 846 * deadfs node here instead 847 */ 848 vrele(cwdi->cwdi_cdir); 849 VREF(vp); 850 cwdi->cwdi_cdir = vp; 851 } 852 853 if (cwdi->cwdi_rdir != NULL) 854 vrele(cwdi->cwdi_rdir); 855 cwdi->cwdi_rdir = vp; 856 out: 857 FILE_UNUSE(fp, p); 858 return (error); 859 } 860 861 862 863 /* 864 * Change current working directory (``.''). 865 */ 866 /* ARGSUSED */ 867 int 868 sys_chdir(p, v, retval) 869 struct proc *p; 870 void *v; 871 register_t *retval; 872 { 873 struct sys_chdir_args /* { 874 syscallarg(const char *) path; 875 } */ *uap = v; 876 struct cwdinfo *cwdi = p->p_cwdi; 877 int error; 878 struct nameidata nd; 879 880 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 881 SCARG(uap, path), p); 882 if ((error = change_dir(&nd, p)) != 0) 883 return (error); 884 vrele(cwdi->cwdi_cdir); 885 cwdi->cwdi_cdir = nd.ni_vp; 886 return (0); 887 } 888 889 /* 890 * Change notion of root (``/'') directory. 891 */ 892 /* ARGSUSED */ 893 int 894 sys_chroot(p, v, retval) 895 struct proc *p; 896 void *v; 897 register_t *retval; 898 { 899 struct sys_chroot_args /* { 900 syscallarg(const char *) path; 901 } */ *uap = v; 902 struct cwdinfo *cwdi = p->p_cwdi; 903 struct vnode *vp; 904 int error; 905 struct nameidata nd; 906 907 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 908 return (error); 909 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 910 SCARG(uap, path), p); 911 if ((error = change_dir(&nd, p)) != 0) 912 return (error); 913 if (cwdi->cwdi_rdir != NULL) 914 vrele(cwdi->cwdi_rdir); 915 vp = nd.ni_vp; 916 cwdi->cwdi_rdir = vp; 917 918 /* 919 * Prevent escaping from chroot by putting the root under 920 * the working directory. Silently chdir to / if we aren't 921 * already there. 922 */ 923 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 924 /* 925 * XXX would be more failsafe to change directory to a 926 * deadfs node here instead 927 */ 928 vrele(cwdi->cwdi_cdir); 929 VREF(vp); 930 cwdi->cwdi_cdir = vp; 931 } 932 933 return (0); 934 } 935 936 /* 937 * Common routine for chroot and chdir. 938 */ 939 static int 940 change_dir(ndp, p) 941 register struct nameidata *ndp; 942 struct proc *p; 943 { 944 struct vnode *vp; 945 int error; 946 947 if ((error = namei(ndp)) != 0) 948 return (error); 949 vp = ndp->ni_vp; 950 if (vp->v_type != VDIR) 951 error = ENOTDIR; 952 else 953 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 954 955 if (error) 956 vput(vp); 957 else 958 VOP_UNLOCK(vp, 0); 959 return (error); 960 } 961 962 /* 963 * Check permissions, allocate an open file structure, 964 * and call the device open routine if any. 965 */ 966 int 967 sys_open(p, v, retval) 968 struct proc *p; 969 void *v; 970 register_t *retval; 971 { 972 register struct sys_open_args /* { 973 syscallarg(const char *) path; 974 syscallarg(int) flags; 975 syscallarg(int) mode; 976 } */ *uap = v; 977 struct cwdinfo *cwdi = p->p_cwdi; 978 struct filedesc *fdp = p->p_fd; 979 struct file *fp; 980 struct vnode *vp; 981 int flags, cmode; 982 int type, indx, error; 983 struct flock lf; 984 struct nameidata nd; 985 extern struct fileops vnops; 986 987 flags = FFLAGS(SCARG(uap, flags)); 988 if ((flags & (FREAD | FWRITE)) == 0) 989 return (EINVAL); 990 /* falloc() will use the file descriptor for us */ 991 if ((error = falloc(p, &fp, &indx)) != 0) 992 return (error); 993 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 994 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 995 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 996 if ((error = vn_open(&nd, flags, cmode)) != 0) { 997 FILE_UNUSE(fp, p); 998 ffree(fp); 999 if ((error == ENODEV || error == ENXIO) && 1000 p->p_dupfd >= 0 && /* XXX from fdopen */ 1001 (error = 1002 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1003 *retval = indx; 1004 return (0); 1005 } 1006 if (error == ERESTART) 1007 error = EINTR; 1008 fdp->fd_ofiles[indx] = NULL; 1009 return (error); 1010 } 1011 p->p_dupfd = 0; 1012 vp = nd.ni_vp; 1013 fp->f_flag = flags & FMASK; 1014 fp->f_type = DTYPE_VNODE; 1015 fp->f_ops = &vnops; 1016 fp->f_data = (caddr_t)vp; 1017 if (flags & (O_EXLOCK | O_SHLOCK)) { 1018 lf.l_whence = SEEK_SET; 1019 lf.l_start = 0; 1020 lf.l_len = 0; 1021 if (flags & O_EXLOCK) 1022 lf.l_type = F_WRLCK; 1023 else 1024 lf.l_type = F_RDLCK; 1025 type = F_FLOCK; 1026 if ((flags & FNONBLOCK) == 0) 1027 type |= F_WAIT; 1028 VOP_UNLOCK(vp, 0); 1029 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1030 if (error) { 1031 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1032 FILE_UNUSE(fp, p); 1033 ffree(fp); 1034 fdp->fd_ofiles[indx] = NULL; 1035 return (error); 1036 } 1037 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1038 fp->f_flag |= FHASLOCK; 1039 } 1040 VOP_UNLOCK(vp, 0); 1041 *retval = indx; 1042 FILE_UNUSE(fp, p); 1043 return (0); 1044 } 1045 1046 /* 1047 * Get file handle system call 1048 */ 1049 int 1050 sys_getfh(p, v, retval) 1051 struct proc *p; 1052 register void *v; 1053 register_t *retval; 1054 { 1055 register struct sys_getfh_args /* { 1056 syscallarg(char *) fname; 1057 syscallarg(fhandle_t *) fhp; 1058 } */ *uap = v; 1059 register struct vnode *vp; 1060 fhandle_t fh; 1061 int error; 1062 struct nameidata nd; 1063 1064 /* 1065 * Must be super user 1066 */ 1067 error = suser(p->p_ucred, &p->p_acflag); 1068 if (error) 1069 return (error); 1070 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1071 SCARG(uap, fname), p); 1072 error = namei(&nd); 1073 if (error) 1074 return (error); 1075 vp = nd.ni_vp; 1076 memset((caddr_t)&fh, 0, sizeof(fh)); 1077 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1078 error = VFS_VPTOFH(vp, &fh.fh_fid); 1079 vput(vp); 1080 if (error) 1081 return (error); 1082 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1083 return (error); 1084 } 1085 1086 /* 1087 * Open a file given a file handle. 1088 * 1089 * Check permissions, allocate an open file structure, 1090 * and call the device open routine if any. 1091 */ 1092 int 1093 sys_fhopen(p, v, retval) 1094 struct proc *p; 1095 void *v; 1096 register_t *retval; 1097 { 1098 register struct sys_fhopen_args /* { 1099 syscallarg(const fhandle_t *) fhp; 1100 syscallarg(int) flags; 1101 } */ *uap = v; 1102 struct filedesc *fdp = p->p_fd; 1103 struct file *fp; 1104 struct vnode *vp = NULL; 1105 struct mount *mp; 1106 struct ucred *cred = p->p_ucred; 1107 int flags; 1108 struct file *nfp; 1109 int type, indx, error=0; 1110 struct flock lf; 1111 struct vattr va; 1112 fhandle_t fh; 1113 extern struct fileops vnops; 1114 1115 /* 1116 * Must be super user 1117 */ 1118 if ((error = suser(p->p_ucred, &p->p_acflag))) 1119 return (error); 1120 1121 flags = FFLAGS(SCARG(uap, flags)); 1122 if ((flags & (FREAD | FWRITE)) == 0) 1123 return (EINVAL); 1124 if ((flags & O_CREAT)) 1125 return (EINVAL); 1126 /* falloc() will use the file descriptor for us */ 1127 if ((error = falloc(p, &nfp, &indx)) != 0) 1128 return (error); 1129 fp = nfp; 1130 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1131 goto bad; 1132 1133 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1134 error = ESTALE; 1135 goto bad; 1136 } 1137 1138 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1139 vp = NULL; /* most likely unnecessary sanity for bad: */ 1140 goto bad; 1141 } 1142 1143 /* Now do an effective vn_open */ 1144 1145 if (vp->v_type == VSOCK) { 1146 error = EOPNOTSUPP; 1147 goto bad; 1148 } 1149 if (flags & FREAD) { 1150 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1151 goto bad; 1152 } 1153 if (flags & (FWRITE | O_TRUNC)) { 1154 if (vp->v_type == VDIR) { 1155 error = EISDIR; 1156 goto bad; 1157 } 1158 if ((error = vn_writechk(vp)) != 0 || 1159 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1160 goto bad; 1161 } 1162 if (flags & O_TRUNC) { 1163 VOP_UNLOCK(vp, 0); /* XXX */ 1164 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1165 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1166 VATTR_NULL(&va); 1167 va.va_size = 0; 1168 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1169 goto bad; 1170 } 1171 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1172 goto bad; 1173 if (flags & FWRITE) 1174 vp->v_writecount++; 1175 1176 /* done with modified vn_open, now finish what sys_open does. */ 1177 1178 fp->f_flag = flags & FMASK; 1179 fp->f_type = DTYPE_VNODE; 1180 fp->f_ops = &vnops; 1181 fp->f_data = (caddr_t)vp; 1182 if (flags & (O_EXLOCK | O_SHLOCK)) { 1183 lf.l_whence = SEEK_SET; 1184 lf.l_start = 0; 1185 lf.l_len = 0; 1186 if (flags & O_EXLOCK) 1187 lf.l_type = F_WRLCK; 1188 else 1189 lf.l_type = F_RDLCK; 1190 type = F_FLOCK; 1191 if ((flags & FNONBLOCK) == 0) 1192 type |= F_WAIT; 1193 VOP_UNLOCK(vp, 0); 1194 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1195 if (error) { 1196 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1197 FILE_UNUSE(fp, p); 1198 ffree(fp); 1199 fdp->fd_ofiles[indx] = NULL; 1200 return (error); 1201 } 1202 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1203 fp->f_flag |= FHASLOCK; 1204 } 1205 VOP_UNLOCK(vp, 0); 1206 *retval = indx; 1207 FILE_UNUSE(fp, p); 1208 return (0); 1209 1210 bad: 1211 FILE_UNUSE(fp, p); 1212 ffree(fp); 1213 fdp->fd_ofiles[indx] = NULL; 1214 if (vp != NULL) 1215 vput(vp); 1216 return (error); 1217 } 1218 1219 /* ARGSUSED */ 1220 int 1221 sys_fhstat(p, v, retval) 1222 struct proc *p; 1223 void *v; 1224 register_t *retval; 1225 { 1226 register struct sys_fhstat_args /* { 1227 syscallarg(const fhandle_t *) fhp; 1228 syscallarg(struct stat *) sb; 1229 } */ *uap = v; 1230 struct stat sb; 1231 int error; 1232 fhandle_t fh; 1233 struct mount *mp; 1234 struct vnode *vp; 1235 1236 /* 1237 * Must be super user 1238 */ 1239 if ((error = suser(p->p_ucred, &p->p_acflag))) 1240 return (error); 1241 1242 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1243 return (error); 1244 1245 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1246 return (ESTALE); 1247 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1248 return (error); 1249 error = vn_stat(vp, &sb, p); 1250 vput(vp); 1251 if (error) 1252 return (error); 1253 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1254 return (error); 1255 } 1256 1257 /* ARGSUSED */ 1258 int 1259 sys_fhstatfs(p, v, retval) 1260 struct proc *p; 1261 void *v; 1262 register_t *retval; 1263 { 1264 register struct sys_fhstatfs_args /* 1265 syscallarg(const fhandle_t *) fhp; 1266 syscallarg(struct statfs *) buf; 1267 } */ *uap = v; 1268 struct statfs sp; 1269 fhandle_t fh; 1270 struct mount *mp; 1271 struct vnode *vp; 1272 int error; 1273 1274 /* 1275 * Must be super user 1276 */ 1277 if ((error = suser(p->p_ucred, &p->p_acflag))) 1278 return (error); 1279 1280 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1281 return (error); 1282 1283 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1284 return (ESTALE); 1285 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1286 return (error); 1287 mp = vp->v_mount; 1288 vput(vp); 1289 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1290 return (error); 1291 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1292 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1293 } 1294 1295 /* 1296 * Create a special file. 1297 */ 1298 /* ARGSUSED */ 1299 int 1300 sys_mknod(p, v, retval) 1301 struct proc *p; 1302 void *v; 1303 register_t *retval; 1304 { 1305 register struct sys_mknod_args /* { 1306 syscallarg(const char *) path; 1307 syscallarg(int) mode; 1308 syscallarg(int) dev; 1309 } */ *uap = v; 1310 register struct vnode *vp; 1311 struct vattr vattr; 1312 int error; 1313 int whiteout = 0; 1314 struct nameidata nd; 1315 1316 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1317 return (error); 1318 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1319 if ((error = namei(&nd)) != 0) 1320 return (error); 1321 vp = nd.ni_vp; 1322 if (vp != NULL) 1323 error = EEXIST; 1324 else { 1325 VATTR_NULL(&vattr); 1326 vattr.va_mode = 1327 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1328 vattr.va_rdev = SCARG(uap, dev); 1329 whiteout = 0; 1330 1331 switch (SCARG(uap, mode) & S_IFMT) { 1332 case S_IFMT: /* used by badsect to flag bad sectors */ 1333 vattr.va_type = VBAD; 1334 break; 1335 case S_IFCHR: 1336 vattr.va_type = VCHR; 1337 break; 1338 case S_IFBLK: 1339 vattr.va_type = VBLK; 1340 break; 1341 case S_IFWHT: 1342 whiteout = 1; 1343 break; 1344 default: 1345 error = EINVAL; 1346 break; 1347 } 1348 } 1349 if (!error) { 1350 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1351 if (whiteout) { 1352 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1353 if (error) 1354 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1355 vput(nd.ni_dvp); 1356 } else { 1357 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1358 &nd.ni_cnd, &vattr); 1359 } 1360 } else { 1361 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1362 if (nd.ni_dvp == vp) 1363 vrele(nd.ni_dvp); 1364 else 1365 vput(nd.ni_dvp); 1366 if (vp) 1367 vrele(vp); 1368 } 1369 return (error); 1370 } 1371 1372 /* 1373 * Create a named pipe. 1374 */ 1375 /* ARGSUSED */ 1376 int 1377 sys_mkfifo(p, v, retval) 1378 struct proc *p; 1379 void *v; 1380 register_t *retval; 1381 { 1382 register struct sys_mkfifo_args /* { 1383 syscallarg(const char *) path; 1384 syscallarg(int) mode; 1385 } */ *uap = v; 1386 struct vattr vattr; 1387 int error; 1388 struct nameidata nd; 1389 1390 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1391 if ((error = namei(&nd)) != 0) 1392 return (error); 1393 if (nd.ni_vp != NULL) { 1394 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1395 if (nd.ni_dvp == nd.ni_vp) 1396 vrele(nd.ni_dvp); 1397 else 1398 vput(nd.ni_dvp); 1399 vrele(nd.ni_vp); 1400 return (EEXIST); 1401 } 1402 VATTR_NULL(&vattr); 1403 vattr.va_type = VFIFO; 1404 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1405 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1406 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1407 } 1408 1409 /* 1410 * Make a hard file link. 1411 */ 1412 /* ARGSUSED */ 1413 int 1414 sys_link(p, v, retval) 1415 struct proc *p; 1416 void *v; 1417 register_t *retval; 1418 { 1419 register struct sys_link_args /* { 1420 syscallarg(const char *) path; 1421 syscallarg(const char *) link; 1422 } */ *uap = v; 1423 register struct vnode *vp; 1424 struct nameidata nd; 1425 int error; 1426 1427 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1428 if ((error = namei(&nd)) != 0) 1429 return (error); 1430 vp = nd.ni_vp; 1431 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1432 if ((error = namei(&nd)) != 0) 1433 goto out; 1434 if (nd.ni_vp) { 1435 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1436 if (nd.ni_dvp == nd.ni_vp) 1437 vrele(nd.ni_dvp); 1438 else 1439 vput(nd.ni_dvp); 1440 vrele(nd.ni_vp); 1441 error = EEXIST; 1442 goto out; 1443 } 1444 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1445 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1446 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1447 out: 1448 vrele(vp); 1449 return (error); 1450 } 1451 1452 /* 1453 * Make a symbolic link. 1454 */ 1455 /* ARGSUSED */ 1456 int 1457 sys_symlink(p, v, retval) 1458 struct proc *p; 1459 void *v; 1460 register_t *retval; 1461 { 1462 register struct sys_symlink_args /* { 1463 syscallarg(const char *) path; 1464 syscallarg(const char *) link; 1465 } */ *uap = v; 1466 struct vattr vattr; 1467 char *path; 1468 int error; 1469 struct nameidata nd; 1470 1471 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1472 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1473 if (error) 1474 goto out; 1475 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1476 if ((error = namei(&nd)) != 0) 1477 goto out; 1478 if (nd.ni_vp) { 1479 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1480 if (nd.ni_dvp == nd.ni_vp) 1481 vrele(nd.ni_dvp); 1482 else 1483 vput(nd.ni_dvp); 1484 vrele(nd.ni_vp); 1485 error = EEXIST; 1486 goto out; 1487 } 1488 VATTR_NULL(&vattr); 1489 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1490 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1491 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1492 out: 1493 FREE(path, M_NAMEI); 1494 return (error); 1495 } 1496 1497 /* 1498 * Delete a whiteout from the filesystem. 1499 */ 1500 /* ARGSUSED */ 1501 int 1502 sys_undelete(p, v, retval) 1503 struct proc *p; 1504 void *v; 1505 register_t *retval; 1506 { 1507 register struct sys_undelete_args /* { 1508 syscallarg(const char *) path; 1509 } */ *uap = v; 1510 int error; 1511 struct nameidata nd; 1512 1513 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1514 SCARG(uap, path), p); 1515 error = namei(&nd); 1516 if (error) 1517 return (error); 1518 1519 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1520 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1521 if (nd.ni_dvp == nd.ni_vp) 1522 vrele(nd.ni_dvp); 1523 else 1524 vput(nd.ni_dvp); 1525 if (nd.ni_vp) 1526 vrele(nd.ni_vp); 1527 return (EEXIST); 1528 } 1529 1530 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1531 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1532 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1533 vput(nd.ni_dvp); 1534 return (error); 1535 } 1536 1537 /* 1538 * Delete a name from the filesystem. 1539 */ 1540 /* ARGSUSED */ 1541 int 1542 sys_unlink(p, v, retval) 1543 struct proc *p; 1544 void *v; 1545 register_t *retval; 1546 { 1547 struct sys_unlink_args /* { 1548 syscallarg(const char *) path; 1549 } */ *uap = v; 1550 register struct vnode *vp; 1551 int error; 1552 struct nameidata nd; 1553 1554 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1555 SCARG(uap, path), p); 1556 if ((error = namei(&nd)) != 0) 1557 return (error); 1558 vp = nd.ni_vp; 1559 1560 /* 1561 * The root of a mounted filesystem cannot be deleted. 1562 */ 1563 if (vp->v_flag & VROOT) { 1564 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1565 if (nd.ni_dvp == vp) 1566 vrele(nd.ni_dvp); 1567 else 1568 vput(nd.ni_dvp); 1569 vput(vp); 1570 error = EBUSY; 1571 goto out; 1572 } 1573 1574 (void)uvm_vnp_uncache(vp); 1575 1576 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1577 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1578 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1579 out: 1580 return (error); 1581 } 1582 1583 /* 1584 * Reposition read/write file offset. 1585 */ 1586 int 1587 sys_lseek(p, v, retval) 1588 struct proc *p; 1589 void *v; 1590 register_t *retval; 1591 { 1592 register struct sys_lseek_args /* { 1593 syscallarg(int) fd; 1594 syscallarg(int) pad; 1595 syscallarg(off_t) offset; 1596 syscallarg(int) whence; 1597 } */ *uap = v; 1598 struct ucred *cred = p->p_ucred; 1599 register struct filedesc *fdp = p->p_fd; 1600 register struct file *fp; 1601 struct vnode *vp; 1602 struct vattr vattr; 1603 register off_t newoff; 1604 int error; 1605 1606 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1607 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1608 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1609 return (EBADF); 1610 1611 FILE_USE(fp); 1612 1613 vp = (struct vnode *)fp->f_data; 1614 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1615 error = ESPIPE; 1616 goto out; 1617 } 1618 1619 switch (SCARG(uap, whence)) { 1620 case SEEK_CUR: 1621 newoff = fp->f_offset + SCARG(uap, offset); 1622 break; 1623 case SEEK_END: 1624 error = VOP_GETATTR(vp, &vattr, cred, p); 1625 if (error) 1626 goto out; 1627 newoff = SCARG(uap, offset) + vattr.va_size; 1628 break; 1629 case SEEK_SET: 1630 newoff = SCARG(uap, offset); 1631 break; 1632 default: 1633 error = EINVAL; 1634 goto out; 1635 } 1636 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1637 goto out; 1638 1639 *(off_t *)retval = fp->f_offset = newoff; 1640 out: 1641 FILE_UNUSE(fp, p); 1642 return (error); 1643 } 1644 1645 /* 1646 * Positional read system call. 1647 */ 1648 int 1649 sys_pread(p, v, retval) 1650 struct proc *p; 1651 void *v; 1652 register_t *retval; 1653 { 1654 struct sys_pread_args /* { 1655 syscallarg(int) fd; 1656 syscallarg(void *) buf; 1657 syscallarg(size_t) nbyte; 1658 syscallarg(off_t) offset; 1659 } */ *uap = v; 1660 struct filedesc *fdp = p->p_fd; 1661 struct file *fp; 1662 struct vnode *vp; 1663 off_t offset; 1664 int error, fd = SCARG(uap, fd); 1665 1666 if ((u_int)fd >= fdp->fd_nfiles || 1667 (fp = fdp->fd_ofiles[fd]) == NULL || 1668 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1669 (fp->f_flag & FREAD) == 0) 1670 return (EBADF); 1671 1672 FILE_USE(fp); 1673 1674 vp = (struct vnode *)fp->f_data; 1675 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1676 error = ESPIPE; 1677 goto out; 1678 } 1679 1680 offset = SCARG(uap, offset); 1681 1682 /* 1683 * XXX This works because no file systems actually 1684 * XXX take any action on the seek operation. 1685 */ 1686 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1687 goto out; 1688 1689 /* dofileread() will unuse the descriptor for us */ 1690 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1691 &offset, 0, retval)); 1692 1693 out: 1694 FILE_UNUSE(fp, p); 1695 return (error); 1696 } 1697 1698 /* 1699 * Positional scatter read system call. 1700 */ 1701 int 1702 sys_preadv(p, v, retval) 1703 struct proc *p; 1704 void *v; 1705 register_t *retval; 1706 { 1707 struct sys_preadv_args /* { 1708 syscallarg(int) fd; 1709 syscallarg(const struct iovec *) iovp; 1710 syscallarg(int) iovcnt; 1711 syscallarg(off_t) offset; 1712 } */ *uap = v; 1713 struct filedesc *fdp = p->p_fd; 1714 struct file *fp; 1715 struct vnode *vp; 1716 off_t offset; 1717 int error, fd = SCARG(uap, fd); 1718 1719 if ((u_int)fd >= fdp->fd_nfiles || 1720 (fp = fdp->fd_ofiles[fd]) == NULL || 1721 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1722 (fp->f_flag & FREAD) == 0) 1723 return (EBADF); 1724 1725 FILE_USE(fp); 1726 1727 vp = (struct vnode *)fp->f_data; 1728 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1729 error = ESPIPE; 1730 goto out; 1731 } 1732 1733 offset = SCARG(uap, offset); 1734 1735 /* 1736 * XXX This works because no file systems actually 1737 * XXX take any action on the seek operation. 1738 */ 1739 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1740 goto out; 1741 1742 /* dofilereadv() will unuse the descriptor for us */ 1743 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1744 &offset, 0, retval)); 1745 1746 out: 1747 FILE_UNUSE(fp, p); 1748 return (error); 1749 } 1750 1751 /* 1752 * Positional write system call. 1753 */ 1754 int 1755 sys_pwrite(p, v, retval) 1756 struct proc *p; 1757 void *v; 1758 register_t *retval; 1759 { 1760 struct sys_pwrite_args /* { 1761 syscallarg(int) fd; 1762 syscallarg(const void *) buf; 1763 syscallarg(size_t) nbyte; 1764 syscallarg(off_t) offset; 1765 } */ *uap = v; 1766 struct filedesc *fdp = p->p_fd; 1767 struct file *fp; 1768 struct vnode *vp; 1769 off_t offset; 1770 int error, fd = SCARG(uap, fd); 1771 1772 if ((u_int)fd >= fdp->fd_nfiles || 1773 (fp = fdp->fd_ofiles[fd]) == NULL || 1774 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1775 (fp->f_flag & FWRITE) == 0) 1776 return (EBADF); 1777 1778 FILE_USE(fp); 1779 1780 vp = (struct vnode *)fp->f_data; 1781 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1782 error = ESPIPE; 1783 goto out; 1784 } 1785 1786 offset = SCARG(uap, offset); 1787 1788 /* 1789 * XXX This works because no file systems actually 1790 * XXX take any action on the seek operation. 1791 */ 1792 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1793 goto out; 1794 1795 /* dofilewrite() will unuse the descriptor for us */ 1796 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1797 &offset, 0, retval)); 1798 1799 out: 1800 FILE_UNUSE(fp, p); 1801 return (error); 1802 } 1803 1804 /* 1805 * Positional gather write system call. 1806 */ 1807 int 1808 sys_pwritev(p, v, retval) 1809 struct proc *p; 1810 void *v; 1811 register_t *retval; 1812 { 1813 struct sys_pwritev_args /* { 1814 syscallarg(int) fd; 1815 syscallarg(const struct iovec *) iovp; 1816 syscallarg(int) iovcnt; 1817 syscallarg(off_t) offset; 1818 } */ *uap = v; 1819 struct filedesc *fdp = p->p_fd; 1820 struct file *fp; 1821 struct vnode *vp; 1822 off_t offset; 1823 int error, fd = SCARG(uap, fd); 1824 1825 if ((u_int)fd >= fdp->fd_nfiles || 1826 (fp = fdp->fd_ofiles[fd]) == NULL || 1827 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1828 (fp->f_flag & FWRITE) == 0) 1829 return (EBADF); 1830 1831 FILE_USE(fp); 1832 1833 vp = (struct vnode *)fp->f_data; 1834 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1835 error = ESPIPE; 1836 goto out; 1837 } 1838 1839 offset = SCARG(uap, offset); 1840 1841 /* 1842 * XXX This works because no file systems actually 1843 * XXX take any action on the seek operation. 1844 */ 1845 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1846 goto out; 1847 1848 /* dofilewritev() will unuse the descriptor for us */ 1849 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1850 &offset, 0, retval)); 1851 1852 out: 1853 FILE_UNUSE(fp, p); 1854 return (error); 1855 } 1856 1857 /* 1858 * Check access permissions. 1859 */ 1860 int 1861 sys_access(p, v, retval) 1862 struct proc *p; 1863 void *v; 1864 register_t *retval; 1865 { 1866 register struct sys_access_args /* { 1867 syscallarg(const char *) path; 1868 syscallarg(int) flags; 1869 } */ *uap = v; 1870 register struct ucred *cred = p->p_ucred; 1871 register struct vnode *vp; 1872 int error, flags, t_gid, t_uid; 1873 struct nameidata nd; 1874 1875 t_uid = cred->cr_uid; 1876 t_gid = cred->cr_gid; 1877 cred->cr_uid = p->p_cred->p_ruid; 1878 cred->cr_gid = p->p_cred->p_rgid; 1879 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1880 SCARG(uap, path), p); 1881 if ((error = namei(&nd)) != 0) 1882 goto out1; 1883 vp = nd.ni_vp; 1884 1885 /* Flags == 0 means only check for existence. */ 1886 if (SCARG(uap, flags)) { 1887 flags = 0; 1888 if (SCARG(uap, flags) & R_OK) 1889 flags |= VREAD; 1890 if (SCARG(uap, flags) & W_OK) 1891 flags |= VWRITE; 1892 if (SCARG(uap, flags) & X_OK) 1893 flags |= VEXEC; 1894 1895 error = VOP_ACCESS(vp, flags, cred, p); 1896 if (!error && (flags & VWRITE)) 1897 error = vn_writechk(vp); 1898 } 1899 vput(vp); 1900 out1: 1901 cred->cr_uid = t_uid; 1902 cred->cr_gid = t_gid; 1903 return (error); 1904 } 1905 1906 /* 1907 * Get file status; this version follows links. 1908 */ 1909 /* ARGSUSED */ 1910 int 1911 sys___stat13(p, v, retval) 1912 struct proc *p; 1913 void *v; 1914 register_t *retval; 1915 { 1916 register struct sys___stat13_args /* { 1917 syscallarg(const char *) path; 1918 syscallarg(struct stat *) ub; 1919 } */ *uap = v; 1920 struct stat sb; 1921 int error; 1922 struct nameidata nd; 1923 1924 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1925 SCARG(uap, path), p); 1926 if ((error = namei(&nd)) != 0) 1927 return (error); 1928 error = vn_stat(nd.ni_vp, &sb, p); 1929 vput(nd.ni_vp); 1930 if (error) 1931 return (error); 1932 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1933 return (error); 1934 } 1935 1936 /* 1937 * Get file status; this version does not follow links. 1938 */ 1939 /* ARGSUSED */ 1940 int 1941 sys___lstat13(p, v, retval) 1942 struct proc *p; 1943 void *v; 1944 register_t *retval; 1945 { 1946 register struct sys___lstat13_args /* { 1947 syscallarg(const char *) path; 1948 syscallarg(struct stat *) ub; 1949 } */ *uap = v; 1950 struct stat sb; 1951 int error; 1952 struct nameidata nd; 1953 1954 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1955 SCARG(uap, path), p); 1956 if ((error = namei(&nd)) != 0) 1957 return (error); 1958 error = vn_stat(nd.ni_vp, &sb, p); 1959 vput(nd.ni_vp); 1960 if (error) 1961 return (error); 1962 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1963 return (error); 1964 } 1965 1966 /* 1967 * Get configurable pathname variables. 1968 */ 1969 /* ARGSUSED */ 1970 int 1971 sys_pathconf(p, v, retval) 1972 struct proc *p; 1973 void *v; 1974 register_t *retval; 1975 { 1976 register struct sys_pathconf_args /* { 1977 syscallarg(const char *) path; 1978 syscallarg(int) name; 1979 } */ *uap = v; 1980 int error; 1981 struct nameidata nd; 1982 1983 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1984 SCARG(uap, path), p); 1985 if ((error = namei(&nd)) != 0) 1986 return (error); 1987 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1988 vput(nd.ni_vp); 1989 return (error); 1990 } 1991 1992 /* 1993 * Return target name of a symbolic link. 1994 */ 1995 /* ARGSUSED */ 1996 int 1997 sys_readlink(p, v, retval) 1998 struct proc *p; 1999 void *v; 2000 register_t *retval; 2001 { 2002 register struct sys_readlink_args /* { 2003 syscallarg(const char *) path; 2004 syscallarg(char *) buf; 2005 syscallarg(size_t) count; 2006 } */ *uap = v; 2007 register struct vnode *vp; 2008 struct iovec aiov; 2009 struct uio auio; 2010 int error; 2011 struct nameidata nd; 2012 2013 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2014 SCARG(uap, path), p); 2015 if ((error = namei(&nd)) != 0) 2016 return (error); 2017 vp = nd.ni_vp; 2018 if (vp->v_type != VLNK) 2019 error = EINVAL; 2020 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2021 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2022 aiov.iov_base = SCARG(uap, buf); 2023 aiov.iov_len = SCARG(uap, count); 2024 auio.uio_iov = &aiov; 2025 auio.uio_iovcnt = 1; 2026 auio.uio_offset = 0; 2027 auio.uio_rw = UIO_READ; 2028 auio.uio_segflg = UIO_USERSPACE; 2029 auio.uio_procp = p; 2030 auio.uio_resid = SCARG(uap, count); 2031 error = VOP_READLINK(vp, &auio, p->p_ucred); 2032 } 2033 vput(vp); 2034 *retval = SCARG(uap, count) - auio.uio_resid; 2035 return (error); 2036 } 2037 2038 /* 2039 * Change flags of a file given a path name. 2040 */ 2041 /* ARGSUSED */ 2042 int 2043 sys_chflags(p, v, retval) 2044 struct proc *p; 2045 void *v; 2046 register_t *retval; 2047 { 2048 register struct sys_chflags_args /* { 2049 syscallarg(const char *) path; 2050 syscallarg(u_long) flags; 2051 } */ *uap = v; 2052 register struct vnode *vp; 2053 struct vattr vattr; 2054 int error; 2055 struct nameidata nd; 2056 2057 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2058 if ((error = namei(&nd)) != 0) 2059 return (error); 2060 vp = nd.ni_vp; 2061 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2062 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2063 /* Non-superusers cannot change the flags on devices, even if they 2064 own them. */ 2065 if (suser(p->p_ucred, &p->p_acflag)) { 2066 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2067 goto out; 2068 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2069 error = EINVAL; 2070 goto out; 2071 } 2072 } 2073 VATTR_NULL(&vattr); 2074 vattr.va_flags = SCARG(uap, flags); 2075 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2076 out: 2077 vput(vp); 2078 return (error); 2079 } 2080 2081 /* 2082 * Change flags of a file given a file descriptor. 2083 */ 2084 /* ARGSUSED */ 2085 int 2086 sys_fchflags(p, v, retval) 2087 struct proc *p; 2088 void *v; 2089 register_t *retval; 2090 { 2091 register struct sys_fchflags_args /* { 2092 syscallarg(int) fd; 2093 syscallarg(u_long) flags; 2094 } */ *uap = v; 2095 struct vattr vattr; 2096 struct vnode *vp; 2097 struct file *fp; 2098 int error; 2099 2100 /* getvnode() will use the descriptor for us */ 2101 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2102 return (error); 2103 vp = (struct vnode *)fp->f_data; 2104 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2105 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2106 /* Non-superusers cannot change the flags on devices, even if they 2107 own them. */ 2108 if (suser(p->p_ucred, &p->p_acflag)) { 2109 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) 2110 != 0) 2111 goto out; 2112 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2113 error = EINVAL; 2114 goto out; 2115 } 2116 } 2117 VATTR_NULL(&vattr); 2118 vattr.va_flags = SCARG(uap, flags); 2119 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2120 out: 2121 VOP_UNLOCK(vp, 0); 2122 FILE_UNUSE(fp, p); 2123 return (error); 2124 } 2125 2126 /* 2127 * Change mode of a file given path name; this version follows links. 2128 */ 2129 /* ARGSUSED */ 2130 int 2131 sys_chmod(p, v, retval) 2132 struct proc *p; 2133 void *v; 2134 register_t *retval; 2135 { 2136 register struct sys_chmod_args /* { 2137 syscallarg(const char *) path; 2138 syscallarg(int) mode; 2139 } */ *uap = v; 2140 int error; 2141 struct nameidata nd; 2142 2143 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2144 if ((error = namei(&nd)) != 0) 2145 return (error); 2146 2147 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2148 2149 vrele(nd.ni_vp); 2150 return (error); 2151 } 2152 2153 /* 2154 * Change mode of a file given a file descriptor. 2155 */ 2156 /* ARGSUSED */ 2157 int 2158 sys_fchmod(p, v, retval) 2159 struct proc *p; 2160 void *v; 2161 register_t *retval; 2162 { 2163 register struct sys_fchmod_args /* { 2164 syscallarg(int) fd; 2165 syscallarg(int) mode; 2166 } */ *uap = v; 2167 struct file *fp; 2168 int error; 2169 2170 /* getvnode() will use the descriptor for us */ 2171 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2172 return (error); 2173 2174 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2175 FILE_UNUSE(fp, p); 2176 return (error); 2177 } 2178 2179 /* 2180 * Change mode of a file given path name; this version does not follow links. 2181 */ 2182 /* ARGSUSED */ 2183 int 2184 sys_lchmod(p, v, retval) 2185 struct proc *p; 2186 void *v; 2187 register_t *retval; 2188 { 2189 register struct sys_lchmod_args /* { 2190 syscallarg(const char *) path; 2191 syscallarg(int) mode; 2192 } */ *uap = v; 2193 int error; 2194 struct nameidata nd; 2195 2196 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2197 if ((error = namei(&nd)) != 0) 2198 return (error); 2199 2200 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2201 2202 vrele(nd.ni_vp); 2203 return (error); 2204 } 2205 2206 /* 2207 * Common routine to set mode given a vnode. 2208 */ 2209 static int 2210 change_mode(vp, mode, p) 2211 struct vnode *vp; 2212 int mode; 2213 struct proc *p; 2214 { 2215 struct vattr vattr; 2216 int error; 2217 2218 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2219 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2220 VATTR_NULL(&vattr); 2221 vattr.va_mode = mode & ALLPERMS; 2222 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2223 VOP_UNLOCK(vp, 0); 2224 return (error); 2225 } 2226 2227 /* 2228 * Set ownership given a path name; this version follows links. 2229 */ 2230 /* ARGSUSED */ 2231 int 2232 sys_chown(p, v, retval) 2233 struct proc *p; 2234 void *v; 2235 register_t *retval; 2236 { 2237 register struct sys_chown_args /* { 2238 syscallarg(const char *) path; 2239 syscallarg(uid_t) uid; 2240 syscallarg(gid_t) gid; 2241 } */ *uap = v; 2242 int error; 2243 struct nameidata nd; 2244 2245 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2246 if ((error = namei(&nd)) != 0) 2247 return (error); 2248 2249 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2250 2251 vrele(nd.ni_vp); 2252 return (error); 2253 } 2254 2255 /* 2256 * Set ownership given a path name; this version follows links. 2257 * Provides POSIX semantics. 2258 */ 2259 /* ARGSUSED */ 2260 int 2261 sys___posix_chown(p, v, retval) 2262 struct proc *p; 2263 void *v; 2264 register_t *retval; 2265 { 2266 register struct sys_chown_args /* { 2267 syscallarg(const char *) path; 2268 syscallarg(uid_t) uid; 2269 syscallarg(gid_t) gid; 2270 } */ *uap = v; 2271 int error; 2272 struct nameidata nd; 2273 2274 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2275 if ((error = namei(&nd)) != 0) 2276 return (error); 2277 2278 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2279 2280 vrele(nd.ni_vp); 2281 return (error); 2282 } 2283 2284 /* 2285 * Set ownership given a file descriptor. 2286 */ 2287 /* ARGSUSED */ 2288 int 2289 sys_fchown(p, v, retval) 2290 struct proc *p; 2291 void *v; 2292 register_t *retval; 2293 { 2294 register struct sys_fchown_args /* { 2295 syscallarg(int) fd; 2296 syscallarg(uid_t) uid; 2297 syscallarg(gid_t) gid; 2298 } */ *uap = v; 2299 int error; 2300 struct file *fp; 2301 2302 /* getvnode() will use the descriptor for us */ 2303 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2304 return (error); 2305 2306 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2307 SCARG(uap, gid), p, 0); 2308 FILE_UNUSE(fp, p); 2309 return (error); 2310 } 2311 2312 /* 2313 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2314 */ 2315 /* ARGSUSED */ 2316 int 2317 sys___posix_fchown(p, v, retval) 2318 struct proc *p; 2319 void *v; 2320 register_t *retval; 2321 { 2322 register struct sys_fchown_args /* { 2323 syscallarg(int) fd; 2324 syscallarg(uid_t) uid; 2325 syscallarg(gid_t) gid; 2326 } */ *uap = v; 2327 int error; 2328 struct file *fp; 2329 2330 /* getvnode() will use the descriptor for us */ 2331 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2332 return (error); 2333 2334 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2335 SCARG(uap, gid), p, 1); 2336 FILE_UNUSE(fp, p); 2337 return (error); 2338 } 2339 2340 /* 2341 * Set ownership given a path name; this version does not follow links. 2342 */ 2343 /* ARGSUSED */ 2344 int 2345 sys_lchown(p, v, retval) 2346 struct proc *p; 2347 void *v; 2348 register_t *retval; 2349 { 2350 register struct sys_lchown_args /* { 2351 syscallarg(const char *) path; 2352 syscallarg(uid_t) uid; 2353 syscallarg(gid_t) gid; 2354 } */ *uap = v; 2355 int error; 2356 struct nameidata nd; 2357 2358 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2359 if ((error = namei(&nd)) != 0) 2360 return (error); 2361 2362 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2363 2364 vrele(nd.ni_vp); 2365 return (error); 2366 } 2367 2368 /* 2369 * Set ownership given a path name; this version does not follow links. 2370 * Provides POSIX/XPG semantics. 2371 */ 2372 /* ARGSUSED */ 2373 int 2374 sys___posix_lchown(p, v, retval) 2375 struct proc *p; 2376 void *v; 2377 register_t *retval; 2378 { 2379 register struct sys_lchown_args /* { 2380 syscallarg(const char *) path; 2381 syscallarg(uid_t) uid; 2382 syscallarg(gid_t) gid; 2383 } */ *uap = v; 2384 int error; 2385 struct nameidata nd; 2386 2387 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2388 if ((error = namei(&nd)) != 0) 2389 return (error); 2390 2391 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2392 2393 vrele(nd.ni_vp); 2394 return (error); 2395 } 2396 2397 /* 2398 * Common routine to set ownership given a vnode. 2399 */ 2400 static int 2401 change_owner(vp, uid, gid, p, posix_semantics) 2402 register struct vnode *vp; 2403 uid_t uid; 2404 gid_t gid; 2405 struct proc *p; 2406 int posix_semantics; 2407 { 2408 struct vattr vattr; 2409 mode_t newmode; 2410 int error; 2411 2412 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2413 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2414 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2415 goto out; 2416 2417 #define CHANGED(x) ((x) != -1) 2418 newmode = vattr.va_mode; 2419 if (posix_semantics) { 2420 /* 2421 * POSIX/XPG semantics: if the caller is not the super-user, 2422 * clear set-user-id and set-group-id bits. Both POSIX and 2423 * the XPG consider the behaviour for calls by the super-user 2424 * implementation-defined; we leave the set-user-id and set- 2425 * group-id settings intact in that case. 2426 */ 2427 if (suser(p->p_ucred, NULL) != 0) 2428 newmode &= ~(S_ISUID | S_ISGID); 2429 } else { 2430 /* 2431 * NetBSD semantics: when changing owner and/or group, 2432 * clear the respective bit(s). 2433 */ 2434 if (CHANGED(uid)) 2435 newmode &= ~S_ISUID; 2436 if (CHANGED(gid)) 2437 newmode &= ~S_ISGID; 2438 } 2439 /* Update va_mode iff altered. */ 2440 if (vattr.va_mode == newmode) 2441 newmode = VNOVAL; 2442 2443 VATTR_NULL(&vattr); 2444 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2445 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2446 vattr.va_mode = newmode; 2447 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2448 #undef CHANGED 2449 2450 out: 2451 VOP_UNLOCK(vp, 0); 2452 return (error); 2453 } 2454 2455 /* 2456 * Set the access and modification times given a path name; this 2457 * version follows links. 2458 */ 2459 /* ARGSUSED */ 2460 int 2461 sys_utimes(p, v, retval) 2462 struct proc *p; 2463 void *v; 2464 register_t *retval; 2465 { 2466 register struct sys_utimes_args /* { 2467 syscallarg(const char *) path; 2468 syscallarg(const struct timeval *) tptr; 2469 } */ *uap = v; 2470 int error; 2471 struct nameidata nd; 2472 2473 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2474 if ((error = namei(&nd)) != 0) 2475 return (error); 2476 2477 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2478 2479 vrele(nd.ni_vp); 2480 return (error); 2481 } 2482 2483 /* 2484 * Set the access and modification times given a file descriptor. 2485 */ 2486 /* ARGSUSED */ 2487 int 2488 sys_futimes(p, v, retval) 2489 struct proc *p; 2490 void *v; 2491 register_t *retval; 2492 { 2493 register struct sys_futimes_args /* { 2494 syscallarg(int) fd; 2495 syscallarg(const struct timeval *) tptr; 2496 } */ *uap = v; 2497 int error; 2498 struct file *fp; 2499 2500 /* getvnode() will use the descriptor for us */ 2501 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2502 return (error); 2503 2504 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2505 FILE_UNUSE(fp, p); 2506 return (error); 2507 } 2508 2509 /* 2510 * Set the access and modification times given a path name; this 2511 * version does not follow links. 2512 */ 2513 /* ARGSUSED */ 2514 int 2515 sys_lutimes(p, v, retval) 2516 struct proc *p; 2517 void *v; 2518 register_t *retval; 2519 { 2520 register struct sys_lutimes_args /* { 2521 syscallarg(const char *) path; 2522 syscallarg(const struct timeval *) tptr; 2523 } */ *uap = v; 2524 int error; 2525 struct nameidata nd; 2526 2527 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2528 if ((error = namei(&nd)) != 0) 2529 return (error); 2530 2531 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2532 2533 vrele(nd.ni_vp); 2534 return (error); 2535 } 2536 2537 /* 2538 * Common routine to set access and modification times given a vnode. 2539 */ 2540 static int 2541 change_utimes(vp, tptr, p) 2542 struct vnode *vp; 2543 const struct timeval *tptr; 2544 struct proc *p; 2545 { 2546 struct timeval tv[2]; 2547 struct vattr vattr; 2548 int error; 2549 2550 VATTR_NULL(&vattr); 2551 if (tptr == NULL) { 2552 microtime(&tv[0]); 2553 tv[1] = tv[0]; 2554 vattr.va_vaflags |= VA_UTIMES_NULL; 2555 } else { 2556 error = copyin(tptr, tv, sizeof(tv)); 2557 if (error) 2558 return (error); 2559 } 2560 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2561 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2562 vattr.va_atime.tv_sec = tv[0].tv_sec; 2563 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2564 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2565 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2566 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2567 VOP_UNLOCK(vp, 0); 2568 return (error); 2569 } 2570 2571 /* 2572 * Truncate a file given its path name. 2573 */ 2574 /* ARGSUSED */ 2575 int 2576 sys_truncate(p, v, retval) 2577 struct proc *p; 2578 void *v; 2579 register_t *retval; 2580 { 2581 register struct sys_truncate_args /* { 2582 syscallarg(const char *) path; 2583 syscallarg(int) pad; 2584 syscallarg(off_t) length; 2585 } */ *uap = v; 2586 register struct vnode *vp; 2587 struct vattr vattr; 2588 int error; 2589 struct nameidata nd; 2590 2591 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2592 if ((error = namei(&nd)) != 0) 2593 return (error); 2594 vp = nd.ni_vp; 2595 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2596 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2597 if (vp->v_type == VDIR) 2598 error = EISDIR; 2599 else if ((error = vn_writechk(vp)) == 0 && 2600 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2601 VATTR_NULL(&vattr); 2602 vattr.va_size = SCARG(uap, length); 2603 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2604 } 2605 vput(vp); 2606 return (error); 2607 } 2608 2609 /* 2610 * Truncate a file given a file descriptor. 2611 */ 2612 /* ARGSUSED */ 2613 int 2614 sys_ftruncate(p, v, retval) 2615 struct proc *p; 2616 void *v; 2617 register_t *retval; 2618 { 2619 register struct sys_ftruncate_args /* { 2620 syscallarg(int) fd; 2621 syscallarg(int) pad; 2622 syscallarg(off_t) length; 2623 } */ *uap = v; 2624 struct vattr vattr; 2625 struct vnode *vp; 2626 struct file *fp; 2627 int error; 2628 2629 /* getvnode() will use the descriptor for us */ 2630 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2631 return (error); 2632 if ((fp->f_flag & FWRITE) == 0) { 2633 error = EINVAL; 2634 goto out; 2635 } 2636 vp = (struct vnode *)fp->f_data; 2637 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2638 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2639 if (vp->v_type == VDIR) 2640 error = EISDIR; 2641 else if ((error = vn_writechk(vp)) == 0) { 2642 VATTR_NULL(&vattr); 2643 vattr.va_size = SCARG(uap, length); 2644 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2645 } 2646 VOP_UNLOCK(vp, 0); 2647 out: 2648 FILE_UNUSE(fp, p); 2649 return (error); 2650 } 2651 2652 /* 2653 * Sync an open file. 2654 */ 2655 /* ARGSUSED */ 2656 int 2657 sys_fsync(p, v, retval) 2658 struct proc *p; 2659 void *v; 2660 register_t *retval; 2661 { 2662 struct sys_fsync_args /* { 2663 syscallarg(int) fd; 2664 } */ *uap = v; 2665 register struct vnode *vp; 2666 struct file *fp; 2667 int error; 2668 2669 /* getvnode() will use the descriptor for us */ 2670 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2671 return (error); 2672 vp = (struct vnode *)fp->f_data; 2673 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2674 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2675 if (error == 0 && bioops.io_fsync != NULL && 2676 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2677 (*bioops.io_fsync)(vp); 2678 VOP_UNLOCK(vp, 0); 2679 FILE_UNUSE(fp, p); 2680 return (error); 2681 } 2682 2683 /* 2684 * Sync the data of an open file. 2685 */ 2686 /* ARGSUSED */ 2687 int 2688 sys_fdatasync(p, v, retval) 2689 struct proc *p; 2690 void *v; 2691 register_t *retval; 2692 { 2693 struct sys_fdatasync_args /* { 2694 syscallarg(int) fd; 2695 } */ *uap = v; 2696 struct vnode *vp; 2697 struct file *fp; 2698 int error; 2699 2700 /* getvnode() will use the descriptor for us */ 2701 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2702 return (error); 2703 vp = (struct vnode *)fp->f_data; 2704 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2705 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2706 if (error == 0 && bioops.io_fsync != NULL) 2707 (*bioops.io_fsync)(vp); 2708 VOP_UNLOCK(vp, 0); 2709 FILE_UNUSE(fp, p); 2710 return (error); 2711 } 2712 2713 /* 2714 * Rename files, (standard) BSD semantics frontend. 2715 */ 2716 /* ARGSUSED */ 2717 int 2718 sys_rename(p, v, retval) 2719 struct proc *p; 2720 void *v; 2721 register_t *retval; 2722 { 2723 register struct sys_rename_args /* { 2724 syscallarg(const char *) from; 2725 syscallarg(const char *) to; 2726 } */ *uap = v; 2727 2728 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2729 } 2730 2731 /* 2732 * Rename files, POSIX semantics frontend. 2733 */ 2734 /* ARGSUSED */ 2735 int 2736 sys___posix_rename(p, v, retval) 2737 struct proc *p; 2738 void *v; 2739 register_t *retval; 2740 { 2741 register struct sys___posix_rename_args /* { 2742 syscallarg(const char *) from; 2743 syscallarg(const char *) to; 2744 } */ *uap = v; 2745 2746 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2747 } 2748 2749 /* 2750 * Rename files. Source and destination must either both be directories, 2751 * or both not be directories. If target is a directory, it must be empty. 2752 * If `from' and `to' refer to the same object, the value of the `retain' 2753 * argument is used to determine whether `from' will be 2754 * 2755 * (retain == 0) deleted unless `from' and `to' refer to the same 2756 * object in the file system's name space (BSD). 2757 * (retain == 1) always retained (POSIX). 2758 */ 2759 static int 2760 rename_files(from, to, p, retain) 2761 const char *from, *to; 2762 struct proc *p; 2763 int retain; 2764 { 2765 register struct vnode *tvp, *fvp, *tdvp; 2766 struct nameidata fromnd, tond; 2767 int error; 2768 2769 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2770 from, p); 2771 if ((error = namei(&fromnd)) != 0) 2772 return (error); 2773 fvp = fromnd.ni_vp; 2774 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2775 UIO_USERSPACE, to, p); 2776 if ((error = namei(&tond)) != 0) { 2777 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2778 vrele(fromnd.ni_dvp); 2779 vrele(fvp); 2780 goto out1; 2781 } 2782 tdvp = tond.ni_dvp; 2783 tvp = tond.ni_vp; 2784 2785 if (tvp != NULL) { 2786 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2787 error = ENOTDIR; 2788 goto out; 2789 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2790 error = EISDIR; 2791 goto out; 2792 } 2793 } 2794 2795 if (fvp == tdvp) 2796 error = EINVAL; 2797 2798 /* 2799 * Source and destination refer to the same object. 2800 */ 2801 if (fvp == tvp) { 2802 if (retain) 2803 error = -1; 2804 else if (fromnd.ni_dvp == tdvp && 2805 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2806 !memcmp(fromnd.ni_cnd.cn_nameptr, 2807 tond.ni_cnd.cn_nameptr, 2808 fromnd.ni_cnd.cn_namelen)) 2809 error = -1; 2810 } 2811 2812 out: 2813 if (!error) { 2814 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2815 if (fromnd.ni_dvp != tdvp) 2816 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2817 if (tvp) { 2818 (void)uvm_vnp_uncache(tvp); 2819 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2820 } 2821 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2822 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2823 } else { 2824 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2825 if (tdvp == tvp) 2826 vrele(tdvp); 2827 else 2828 vput(tdvp); 2829 if (tvp) 2830 vput(tvp); 2831 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2832 vrele(fromnd.ni_dvp); 2833 vrele(fvp); 2834 } 2835 vrele(tond.ni_startdir); 2836 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2837 out1: 2838 if (fromnd.ni_startdir) 2839 vrele(fromnd.ni_startdir); 2840 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2841 return (error == -1 ? 0 : error); 2842 } 2843 2844 /* 2845 * Make a directory file. 2846 */ 2847 /* ARGSUSED */ 2848 int 2849 sys_mkdir(p, v, retval) 2850 struct proc *p; 2851 void *v; 2852 register_t *retval; 2853 { 2854 register struct sys_mkdir_args /* { 2855 syscallarg(const char *) path; 2856 syscallarg(int) mode; 2857 } */ *uap = v; 2858 register struct vnode *vp; 2859 struct vattr vattr; 2860 int error; 2861 struct nameidata nd; 2862 2863 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2864 if ((error = namei(&nd)) != 0) 2865 return (error); 2866 vp = nd.ni_vp; 2867 if (vp != NULL) { 2868 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2869 if (nd.ni_dvp == vp) 2870 vrele(nd.ni_dvp); 2871 else 2872 vput(nd.ni_dvp); 2873 vrele(vp); 2874 return (EEXIST); 2875 } 2876 VATTR_NULL(&vattr); 2877 vattr.va_type = VDIR; 2878 vattr.va_mode = 2879 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2880 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2881 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2882 if (!error) 2883 vput(nd.ni_vp); 2884 return (error); 2885 } 2886 2887 /* 2888 * Remove a directory file. 2889 */ 2890 /* ARGSUSED */ 2891 int 2892 sys_rmdir(p, v, retval) 2893 struct proc *p; 2894 void *v; 2895 register_t *retval; 2896 { 2897 struct sys_rmdir_args /* { 2898 syscallarg(const char *) path; 2899 } */ *uap = v; 2900 register struct vnode *vp; 2901 int error; 2902 struct nameidata nd; 2903 2904 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2905 SCARG(uap, path), p); 2906 if ((error = namei(&nd)) != 0) 2907 return (error); 2908 vp = nd.ni_vp; 2909 if (vp->v_type != VDIR) { 2910 error = ENOTDIR; 2911 goto out; 2912 } 2913 /* 2914 * No rmdir "." please. 2915 */ 2916 if (nd.ni_dvp == vp) { 2917 error = EINVAL; 2918 goto out; 2919 } 2920 /* 2921 * The root of a mounted filesystem cannot be deleted. 2922 */ 2923 if (vp->v_flag & VROOT) 2924 error = EBUSY; 2925 out: 2926 if (!error) { 2927 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2928 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2929 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2930 } else { 2931 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2932 if (nd.ni_dvp == vp) 2933 vrele(nd.ni_dvp); 2934 else 2935 vput(nd.ni_dvp); 2936 vput(vp); 2937 } 2938 return (error); 2939 } 2940 2941 /* 2942 * Read a block of directory entries in a file system independent format. 2943 */ 2944 int 2945 sys_getdents(p, v, retval) 2946 struct proc *p; 2947 void *v; 2948 register_t *retval; 2949 { 2950 register struct sys_getdents_args /* { 2951 syscallarg(int) fd; 2952 syscallarg(char *) buf; 2953 syscallarg(size_t) count; 2954 } */ *uap = v; 2955 struct file *fp; 2956 int error, done; 2957 2958 /* getvnode() will use the descriptor for us */ 2959 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2960 return (error); 2961 if ((fp->f_flag & FREAD) == 0) { 2962 error = EBADF; 2963 goto out; 2964 } 2965 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2966 SCARG(uap, count), &done, p, 0, 0); 2967 *retval = done; 2968 out: 2969 FILE_UNUSE(fp, p); 2970 return (error); 2971 } 2972 2973 /* 2974 * Set the mode mask for creation of filesystem nodes. 2975 */ 2976 int 2977 sys_umask(p, v, retval) 2978 struct proc *p; 2979 void *v; 2980 register_t *retval; 2981 { 2982 struct sys_umask_args /* { 2983 syscallarg(mode_t) newmask; 2984 } */ *uap = v; 2985 struct cwdinfo *cwdi; 2986 2987 cwdi = p->p_cwdi; 2988 *retval = cwdi->cwdi_cmask; 2989 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2990 return (0); 2991 } 2992 2993 /* 2994 * Void all references to file by ripping underlying filesystem 2995 * away from vnode. 2996 */ 2997 /* ARGSUSED */ 2998 int 2999 sys_revoke(p, v, retval) 3000 struct proc *p; 3001 void *v; 3002 register_t *retval; 3003 { 3004 register struct sys_revoke_args /* { 3005 syscallarg(const char *) path; 3006 } */ *uap = v; 3007 register struct vnode *vp; 3008 struct vattr vattr; 3009 int error; 3010 struct nameidata nd; 3011 3012 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3013 if ((error = namei(&nd)) != 0) 3014 return (error); 3015 vp = nd.ni_vp; 3016 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3017 goto out; 3018 if (p->p_ucred->cr_uid != vattr.va_uid && 3019 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3020 goto out; 3021 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3022 VOP_REVOKE(vp, REVOKEALL); 3023 out: 3024 vrele(vp); 3025 return (error); 3026 } 3027 3028 /* 3029 * Convert a user file descriptor to a kernel file entry. 3030 */ 3031 int 3032 getvnode(fdp, fd, fpp) 3033 struct filedesc *fdp; 3034 int fd; 3035 struct file **fpp; 3036 { 3037 struct vnode *vp; 3038 struct file *fp; 3039 3040 if ((u_int)fd >= fdp->fd_nfiles || 3041 (fp = fdp->fd_ofiles[fd]) == NULL || 3042 (fp->f_iflags & FIF_WANTCLOSE) != 0) 3043 return (EBADF); 3044 3045 FILE_USE(fp); 3046 3047 if (fp->f_type != DTYPE_VNODE) { 3048 FILE_UNUSE(fp, NULL); 3049 return (EINVAL); 3050 } 3051 3052 vp = (struct vnode *)fp->f_data; 3053 if (vp->v_type == VBAD) { 3054 FILE_UNUSE(fp, NULL); 3055 return (EBADF); 3056 } 3057 3058 *fpp = fp; 3059 return (0); 3060 } 3061
Indexes created Fri Oct 03 17:10:05 GMT 2025