vfs_syscalls.c revision 1.150
1 /* $NetBSD: vfs_syscalls.c,v 1.150 2000/02/16 11:57:46 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 int dovfsusermount = 0; 82 83 /* 84 * Virtual File System System Calls 85 */ 86 87 /* 88 * Mount a file system. 89 */ 90 91 /* 92 * This table is used to maintain compatibility with 4.3BSD 93 * and NetBSD 0.9 mount syscalls. Note, the order is important! 94 * 95 * Also note that not all of these had actual numbers in 4.3BSD 96 * or NetBSD 0.9! 97 */ 98 const char *mountcompatnames[] = { 99 NULL, /* 0 = MOUNT_NONE */ 100 MOUNT_FFS, /* 1 */ 101 MOUNT_NFS, /* 2 */ 102 MOUNT_MFS, /* 3 */ 103 MOUNT_MSDOS, /* 4 */ 104 MOUNT_LFS, /* 5 */ 105 NULL, /* 6 = MOUNT_LOFS */ 106 MOUNT_FDESC, /* 7 */ 107 MOUNT_PORTAL, /* 8 */ 108 MOUNT_NULL, /* 9 */ 109 MOUNT_UMAP, /* 10 */ 110 MOUNT_KERNFS, /* 11 */ 111 MOUNT_PROCFS, /* 12 */ 112 MOUNT_AFS, /* 13 */ 113 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 114 MOUNT_UNION, /* 15 */ 115 MOUNT_ADOSFS, /* 16 */ 116 MOUNT_EXT2FS, /* 17 */ 117 MOUNT_CODA, /* 18 */ 118 MOUNT_FILECORE, /* 19 */ 119 MOUNT_NTFS, /* 20 */ 120 }; 121 const int nmountcompatnames = sizeof(mountcompatnames) / 122 sizeof(mountcompatnames[0]); 123 124 /* ARGSUSED */ 125 int 126 sys_mount(p, v, retval) 127 struct proc *p; 128 void *v; 129 register_t *retval; 130 { 131 register struct sys_mount_args /* { 132 syscallarg(const char *) type; 133 syscallarg(const char *) path; 134 syscallarg(int) flags; 135 syscallarg(void *) data; 136 } */ *uap = v; 137 struct vnode *vp; 138 struct mount *mp; 139 int error, flag = 0; 140 char fstypename[MFSNAMELEN]; 141 struct vattr va; 142 struct nameidata nd; 143 struct vfsops *vfs; 144 145 if (dovfsusermount == 0 && (error = suser(p->p_ucred, &p->p_acflag))) 146 return (error); 147 /* 148 * Get vnode to be covered 149 */ 150 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 151 SCARG(uap, path), p); 152 if ((error = namei(&nd)) != 0) 153 return (error); 154 vp = nd.ni_vp; 155 /* 156 * A lookup in VFS_MOUNT might result in an attempt to 157 * lock this vnode again, so make the lock resursive. 158 */ 159 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 160 if (SCARG(uap, flags) & MNT_UPDATE) { 161 if ((vp->v_flag & VROOT) == 0) { 162 vput(vp); 163 return (EINVAL); 164 } 165 mp = vp->v_mount; 166 flag = mp->mnt_flag; 167 vfs = mp->mnt_op; 168 /* 169 * We only allow the filesystem to be reloaded if it 170 * is currently mounted read-only. 171 */ 172 if ((SCARG(uap, flags) & MNT_RELOAD) && 173 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 174 vput(vp); 175 return (EOPNOTSUPP); /* Needs translation */ 176 } 177 /* 178 * In "highly secure" mode, don't let the caller do anything 179 * but downgrade a filesystem from read-write to read-only. 180 * (see also below; MNT_UPDATE is required.) 181 */ 182 if (securelevel >= 2 && 183 (SCARG(uap, flags) != 184 (mp->mnt_flag | MNT_RDONLY | 185 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 186 vput(vp); 187 return (EPERM); 188 } 189 mp->mnt_flag |= 190 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 191 /* 192 * Only root, or the user that did the original mount is 193 * permitted to update it. 194 */ 195 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 196 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 197 vput(vp); 198 return (error); 199 } 200 /* 201 * Do not allow NFS export by non-root users. For non-root 202 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 203 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 204 */ 205 if (p->p_ucred->cr_uid != 0) { 206 if (SCARG(uap, flags) & MNT_EXPORTED) { 207 vput(vp); 208 return (EPERM); 209 } 210 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 211 if (flag & MNT_NOEXEC) 212 SCARG(uap, flags) |= MNT_NOEXEC; 213 } 214 if (vfs_busy(mp, LK_NOWAIT, 0)) { 215 vput(vp); 216 return (EPERM); 217 } 218 VOP_UNLOCK(vp, 0); 219 goto update; 220 } else { 221 if (securelevel >= 2) 222 return (EPERM); 223 } 224 /* 225 * If the user is not root, ensure that they own the directory 226 * onto which we are attempting to mount. 227 */ 228 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 229 (va.va_uid != p->p_ucred->cr_uid && 230 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 231 vput(vp); 232 return (error); 233 } 234 /* 235 * Do not allow NFS export by non-root users. For non-root users, 236 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 237 * mount point is already MNT_NOEXEC. 238 */ 239 if (p->p_ucred->cr_uid != 0) { 240 if (SCARG(uap, flags) & MNT_EXPORTED) { 241 vput(vp); 242 return (EPERM); 243 } 244 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 245 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 246 SCARG(uap, flags) |= MNT_NOEXEC; 247 } 248 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 249 return (error); 250 if (vp->v_type != VDIR) { 251 vput(vp); 252 return (ENOTDIR); 253 } 254 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 255 if (error) { 256 #if defined(COMPAT_09) || defined(COMPAT_43) 257 /* 258 * Historically filesystem types were identified by number. 259 * If we get an integer for the filesystem type instead of a 260 * string, we check to see if it matches one of the historic 261 * filesystem types. 262 */ 263 u_long fsindex = (u_long)SCARG(uap, type); 264 if (fsindex >= nmountcompatnames || 265 mountcompatnames[fsindex] == NULL) { 266 vput(vp); 267 return (ENODEV); 268 } 269 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 270 #else 271 vput(vp); 272 return (error); 273 #endif 274 } 275 #ifdef COMPAT_10 276 /* Accept `ufs' as an alias for `ffs'. */ 277 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 278 strncpy(fstypename, "ffs", MFSNAMELEN); 279 #endif 280 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 281 vput(vp); 282 return (ENODEV); 283 } 284 if (vp->v_mountedhere != NULL) { 285 vput(vp); 286 return (EBUSY); 287 } 288 289 /* 290 * Allocate and initialize the file system. 291 */ 292 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 293 M_MOUNT, M_WAITOK); 294 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 295 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 296 (void)vfs_busy(mp, LK_NOWAIT, 0); 297 mp->mnt_op = vfs; 298 vfs->vfs_refcount++; 299 mp->mnt_vnodecovered = vp; 300 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 301 mp->mnt_unmounter = NULL; 302 update: 303 /* 304 * Set the mount level flags. 305 */ 306 if (SCARG(uap, flags) & MNT_RDONLY) 307 mp->mnt_flag |= MNT_RDONLY; 308 else if (mp->mnt_flag & MNT_RDONLY) 309 mp->mnt_flag |= MNT_WANTRDWR; 310 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 311 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 312 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 313 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 314 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 315 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM); 316 /* 317 * Mount the filesystem. 318 */ 319 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 320 if (mp->mnt_flag & MNT_UPDATE) { 321 vrele(vp); 322 if (mp->mnt_flag & MNT_WANTRDWR) 323 mp->mnt_flag &= ~MNT_RDONLY; 324 mp->mnt_flag &=~ 325 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 326 if (error) 327 mp->mnt_flag = flag; 328 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 329 if (mp->mnt_syncer == NULL) 330 error = vfs_allocate_syncvnode(mp); 331 } else { 332 if (mp->mnt_syncer != NULL) 333 vgone(mp->mnt_syncer); 334 mp->mnt_syncer = NULL; 335 } 336 vfs_unbusy(mp); 337 return (error); 338 } 339 /* 340 * Put the new filesystem on the mount list after root. 341 */ 342 cache_purge(vp); 343 if (!error) { 344 vp->v_mountedhere = mp; 345 simple_lock(&mountlist_slock); 346 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 347 simple_unlock(&mountlist_slock); 348 checkdirs(vp); 349 VOP_UNLOCK(vp, 0); 350 if ((mp->mnt_flag & MNT_RDONLY) == 0) 351 error = vfs_allocate_syncvnode(mp); 352 vfs_unbusy(mp); 353 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 354 if ((error = VFS_START(mp, 0, p))) 355 vrele(vp); 356 } else { 357 vp->v_mountedhere = (struct mount *)0; 358 vfs->vfs_refcount--; 359 vfs_unbusy(mp); 360 free((caddr_t)mp, M_MOUNT); 361 vput(vp); 362 } 363 return (error); 364 } 365 366 /* 367 * Scan all active processes to see if any of them have a current 368 * or root directory onto which the new filesystem has just been 369 * mounted. If so, replace them with the new mount point. 370 */ 371 void 372 checkdirs(olddp) 373 struct vnode *olddp; 374 { 375 struct cwdinfo *cwdi; 376 struct vnode *newdp; 377 struct proc *p; 378 379 if (olddp->v_usecount == 1) 380 return; 381 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 382 panic("mount: lost mount"); 383 proclist_lock_read(); 384 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 385 cwdi = p->p_cwdi; 386 if (cwdi->cwdi_cdir == olddp) { 387 vrele(cwdi->cwdi_cdir); 388 VREF(newdp); 389 cwdi->cwdi_cdir = newdp; 390 } 391 if (cwdi->cwdi_rdir == olddp) { 392 vrele(cwdi->cwdi_rdir); 393 VREF(newdp); 394 cwdi->cwdi_rdir = newdp; 395 } 396 } 397 proclist_unlock_read(); 398 if (rootvnode == olddp) { 399 vrele(rootvnode); 400 VREF(newdp); 401 rootvnode = newdp; 402 } 403 vput(newdp); 404 } 405 406 /* 407 * Unmount a file system. 408 * 409 * Note: unmount takes a path to the vnode mounted on as argument, 410 * not special file (as before). 411 */ 412 /* ARGSUSED */ 413 int 414 sys_unmount(p, v, retval) 415 struct proc *p; 416 void *v; 417 register_t *retval; 418 { 419 register struct sys_unmount_args /* { 420 syscallarg(const char *) path; 421 syscallarg(int) flags; 422 } */ *uap = v; 423 register struct vnode *vp; 424 struct mount *mp; 425 int error; 426 struct nameidata nd; 427 428 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 429 SCARG(uap, path), p); 430 if ((error = namei(&nd)) != 0) 431 return (error); 432 vp = nd.ni_vp; 433 mp = vp->v_mount; 434 435 /* 436 * Only root, or the user that did the original mount is 437 * permitted to unmount this filesystem. 438 */ 439 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 440 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 441 vput(vp); 442 return (error); 443 } 444 445 /* 446 * Don't allow unmounting the root file system. 447 */ 448 if (mp->mnt_flag & MNT_ROOTFS) { 449 vput(vp); 450 return (EINVAL); 451 } 452 453 /* 454 * Must be the root of the filesystem 455 */ 456 if ((vp->v_flag & VROOT) == 0) { 457 vput(vp); 458 return (EINVAL); 459 } 460 vput(vp); 461 462 if (vfs_busy(mp, 0, 0)) 463 return (EBUSY); 464 465 return (dounmount(mp, SCARG(uap, flags), p)); 466 } 467 468 /* 469 * Do the actual file system unmount. File system is assumed to have been 470 * marked busy by the caller. 471 */ 472 int 473 dounmount(mp, flags, p) 474 register struct mount *mp; 475 int flags; 476 struct proc *p; 477 { 478 struct vnode *coveredvp; 479 int error; 480 int async; 481 482 simple_lock(&mountlist_slock); 483 vfs_unbusy(mp); 484 /* 485 * XXX Freeze syncer. This should really be done on a mountpoint 486 * basis, but especially the softdep code possibly called from 487 * the syncer doesn't exactly work on a per-mountpoint basis, 488 * so the softdep code would become a maze of vfs_busy calls. 489 */ 490 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 491 492 mp->mnt_flag |= MNT_UNMOUNT; 493 mp->mnt_unmounter = p; 494 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 495 if (mp->mnt_flag & MNT_EXPUBLIC) 496 vfs_setpublicfs(NULL, NULL, NULL); 497 async = mp->mnt_flag & MNT_ASYNC; 498 mp->mnt_flag &=~ MNT_ASYNC; 499 cache_purgevfs(mp); /* remove cache entries for this file sys */ 500 if (mp->mnt_syncer != NULL) 501 vgone(mp->mnt_syncer); 502 if (((mp->mnt_flag & MNT_RDONLY) || 503 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 504 (flags & MNT_FORCE)) 505 error = VFS_UNMOUNT(mp, flags, p); 506 simple_lock(&mountlist_slock); 507 if (error) { 508 if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL) 509 (void) vfs_allocate_syncvnode(mp); 510 mp->mnt_flag &= ~MNT_UNMOUNT; 511 mp->mnt_unmounter = NULL; 512 mp->mnt_flag |= async; 513 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 514 &mountlist_slock); 515 lockmgr(&syncer_lock, LK_RELEASE, NULL); 516 while(mp->mnt_wcnt > 0) { 517 wakeup((caddr_t)mp); 518 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 519 } 520 return (error); 521 } 522 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 523 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 524 coveredvp->v_mountedhere = NULL; 525 vrele(coveredvp); 526 } 527 mp->mnt_op->vfs_refcount--; 528 if (mp->mnt_vnodelist.lh_first != NULL) 529 panic("unmount: dangling vnode"); 530 mp->mnt_flag |= MNT_GONE; 531 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 532 lockmgr(&syncer_lock, LK_RELEASE, NULL); 533 while(mp->mnt_wcnt > 0) { 534 wakeup((caddr_t)mp); 535 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 536 } 537 free((caddr_t)mp, M_MOUNT); 538 return (0); 539 } 540 541 /* 542 * Sync each mounted filesystem. 543 */ 544 #ifdef DEBUG 545 int syncprt = 0; 546 struct ctldebug debug0 = { "syncprt", &syncprt }; 547 #endif 548 549 /* ARGSUSED */ 550 int 551 sys_sync(p, v, retval) 552 struct proc *p; 553 void *v; 554 register_t *retval; 555 { 556 register struct mount *mp, *nmp; 557 int asyncflag; 558 559 simple_lock(&mountlist_slock); 560 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 561 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 562 nmp = mp->mnt_list.cqe_prev; 563 continue; 564 } 565 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 566 asyncflag = mp->mnt_flag & MNT_ASYNC; 567 mp->mnt_flag &= ~MNT_ASYNC; 568 uvm_vnp_sync(mp); 569 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 570 if (asyncflag) 571 mp->mnt_flag |= MNT_ASYNC; 572 } 573 simple_lock(&mountlist_slock); 574 nmp = mp->mnt_list.cqe_prev; 575 vfs_unbusy(mp); 576 577 } 578 simple_unlock(&mountlist_slock); 579 #ifdef DEBUG 580 if (syncprt) 581 vfs_bufstats(); 582 #endif /* DEBUG */ 583 return (0); 584 } 585 586 /* 587 * Change filesystem quotas. 588 */ 589 /* ARGSUSED */ 590 int 591 sys_quotactl(p, v, retval) 592 struct proc *p; 593 void *v; 594 register_t *retval; 595 { 596 register struct sys_quotactl_args /* { 597 syscallarg(const char *) path; 598 syscallarg(int) cmd; 599 syscallarg(int) uid; 600 syscallarg(caddr_t) arg; 601 } */ *uap = v; 602 register struct mount *mp; 603 int error; 604 struct nameidata nd; 605 606 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 607 if ((error = namei(&nd)) != 0) 608 return (error); 609 mp = nd.ni_vp->v_mount; 610 vrele(nd.ni_vp); 611 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 612 SCARG(uap, arg), p)); 613 } 614 615 /* 616 * Get filesystem statistics. 617 */ 618 /* ARGSUSED */ 619 int 620 sys_statfs(p, v, retval) 621 struct proc *p; 622 void *v; 623 register_t *retval; 624 { 625 register struct sys_statfs_args /* { 626 syscallarg(const char *) path; 627 syscallarg(struct statfs *) buf; 628 } */ *uap = v; 629 register struct mount *mp; 630 register struct statfs *sp; 631 int error; 632 struct nameidata nd; 633 634 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 635 if ((error = namei(&nd)) != 0) 636 return (error); 637 mp = nd.ni_vp->v_mount; 638 sp = &mp->mnt_stat; 639 vrele(nd.ni_vp); 640 if ((error = VFS_STATFS(mp, sp, p)) != 0) 641 return (error); 642 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 643 sp->f_oflags = sp->f_flags & 0xffff; 644 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 645 } 646 647 /* 648 * Get filesystem statistics. 649 */ 650 /* ARGSUSED */ 651 int 652 sys_fstatfs(p, v, retval) 653 struct proc *p; 654 void *v; 655 register_t *retval; 656 { 657 register struct sys_fstatfs_args /* { 658 syscallarg(int) fd; 659 syscallarg(struct statfs *) buf; 660 } */ *uap = v; 661 struct file *fp; 662 struct mount *mp; 663 register struct statfs *sp; 664 int error; 665 666 /* getvnode() will use the descriptor for us */ 667 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 668 return (error); 669 mp = ((struct vnode *)fp->f_data)->v_mount; 670 sp = &mp->mnt_stat; 671 if ((error = VFS_STATFS(mp, sp, p)) != 0) 672 goto out; 673 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 674 sp->f_oflags = sp->f_flags & 0xffff; 675 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 676 out: 677 FILE_UNUSE(fp, p); 678 return (error); 679 } 680 681 /* 682 * Get statistics on all filesystems. 683 */ 684 int 685 sys_getfsstat(p, v, retval) 686 struct proc *p; 687 void *v; 688 register_t *retval; 689 { 690 register struct sys_getfsstat_args /* { 691 syscallarg(struct statfs *) buf; 692 syscallarg(long) bufsize; 693 syscallarg(int) flags; 694 } */ *uap = v; 695 register struct mount *mp, *nmp; 696 register struct statfs *sp; 697 caddr_t sfsp; 698 long count, maxcount, error; 699 700 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 701 sfsp = (caddr_t)SCARG(uap, buf); 702 simple_lock(&mountlist_slock); 703 count = 0; 704 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 705 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 706 nmp = mp->mnt_list.cqe_next; 707 continue; 708 } 709 if (sfsp && count < maxcount) { 710 sp = &mp->mnt_stat; 711 /* 712 * If MNT_NOWAIT or MNT_LAZY is specified, do not 713 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 714 * overrides MNT_NOWAIT. 715 */ 716 if (SCARG(uap, flags) != MNT_NOWAIT && 717 SCARG(uap, flags) != MNT_LAZY && 718 (SCARG(uap, flags) == MNT_WAIT || 719 SCARG(uap, flags) == 0) && 720 (error = VFS_STATFS(mp, sp, p)) != 0) { 721 simple_lock(&mountlist_slock); 722 nmp = mp->mnt_list.cqe_next; 723 vfs_unbusy(mp); 724 continue; 725 } 726 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 727 sp->f_oflags = sp->f_flags & 0xffff; 728 error = copyout(sp, sfsp, sizeof(*sp)); 729 if (error) { 730 vfs_unbusy(mp); 731 return (error); 732 } 733 sfsp += sizeof(*sp); 734 } 735 count++; 736 simple_lock(&mountlist_slock); 737 nmp = mp->mnt_list.cqe_next; 738 vfs_unbusy(mp); 739 } 740 simple_unlock(&mountlist_slock); 741 if (sfsp && count > maxcount) 742 *retval = maxcount; 743 else 744 *retval = count; 745 return (0); 746 } 747 748 /* 749 * Change current working directory to a given file descriptor. 750 */ 751 /* ARGSUSED */ 752 int 753 sys_fchdir(p, v, retval) 754 struct proc *p; 755 void *v; 756 register_t *retval; 757 { 758 struct sys_fchdir_args /* { 759 syscallarg(int) fd; 760 } */ *uap = v; 761 struct filedesc *fdp = p->p_fd; 762 struct cwdinfo *cwdi = p->p_cwdi; 763 struct vnode *vp, *tdp; 764 struct mount *mp; 765 struct file *fp; 766 int error; 767 768 /* getvnode() will use the descriptor for us */ 769 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 770 return (error); 771 vp = (struct vnode *)fp->f_data; 772 773 VREF(vp); 774 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 775 if (vp->v_type != VDIR) 776 error = ENOTDIR; 777 else 778 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 779 while (!error && (mp = vp->v_mountedhere) != NULL) { 780 if (vfs_busy(mp, 0, 0)) 781 continue; 782 error = VFS_ROOT(mp, &tdp); 783 vfs_unbusy(mp); 784 if (error) 785 break; 786 vput(vp); 787 vp = tdp; 788 } 789 if (error) { 790 vput(vp); 791 goto out; 792 } 793 VOP_UNLOCK(vp, 0); 794 795 /* 796 * Disallow changing to a directory not under the process's 797 * current root directory (if there is one). 798 */ 799 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 800 vrele(vp); 801 error = EPERM; /* operation not permitted */ 802 goto out; 803 } 804 805 vrele(cwdi->cwdi_cdir); 806 cwdi->cwdi_cdir = vp; 807 out: 808 FILE_UNUSE(fp, p); 809 return (error); 810 } 811 812 /* 813 * Change this process's notion of the root directory to a given file descriptor. 814 */ 815 816 int 817 sys_fchroot(p, v, retval) 818 struct proc *p; 819 void *v; 820 register_t *retval; 821 { 822 struct sys_fchroot_args *uap = v; 823 struct filedesc *fdp = p->p_fd; 824 struct cwdinfo *cwdi = p->p_cwdi; 825 struct vnode *vp; 826 struct file *fp; 827 int error; 828 829 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 830 return error; 831 /* getvnode() will use the descriptor for us */ 832 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 833 return error; 834 vp = (struct vnode *) fp->f_data; 835 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 836 if (vp->v_type != VDIR) 837 error = ENOTDIR; 838 else 839 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 840 VOP_UNLOCK(vp, 0); 841 if (error) 842 goto out; 843 VREF(vp); 844 845 /* 846 * Prevent escaping from chroot by putting the root under 847 * the working directory. Silently chdir to / if we aren't 848 * already there. 849 */ 850 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 851 /* 852 * XXX would be more failsafe to change directory to a 853 * deadfs node here instead 854 */ 855 vrele(cwdi->cwdi_cdir); 856 VREF(vp); 857 cwdi->cwdi_cdir = vp; 858 } 859 860 if (cwdi->cwdi_rdir != NULL) 861 vrele(cwdi->cwdi_rdir); 862 cwdi->cwdi_rdir = vp; 863 out: 864 FILE_UNUSE(fp, p); 865 return (error); 866 } 867 868 869 870 /* 871 * Change current working directory (``.''). 872 */ 873 /* ARGSUSED */ 874 int 875 sys_chdir(p, v, retval) 876 struct proc *p; 877 void *v; 878 register_t *retval; 879 { 880 struct sys_chdir_args /* { 881 syscallarg(const char *) path; 882 } */ *uap = v; 883 struct cwdinfo *cwdi = p->p_cwdi; 884 int error; 885 struct nameidata nd; 886 887 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 888 SCARG(uap, path), p); 889 if ((error = change_dir(&nd, p)) != 0) 890 return (error); 891 vrele(cwdi->cwdi_cdir); 892 cwdi->cwdi_cdir = nd.ni_vp; 893 return (0); 894 } 895 896 /* 897 * Change notion of root (``/'') directory. 898 */ 899 /* ARGSUSED */ 900 int 901 sys_chroot(p, v, retval) 902 struct proc *p; 903 void *v; 904 register_t *retval; 905 { 906 struct sys_chroot_args /* { 907 syscallarg(const char *) path; 908 } */ *uap = v; 909 struct cwdinfo *cwdi = p->p_cwdi; 910 struct vnode *vp; 911 int error; 912 struct nameidata nd; 913 914 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 915 return (error); 916 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 917 SCARG(uap, path), p); 918 if ((error = change_dir(&nd, p)) != 0) 919 return (error); 920 if (cwdi->cwdi_rdir != NULL) 921 vrele(cwdi->cwdi_rdir); 922 vp = nd.ni_vp; 923 cwdi->cwdi_rdir = vp; 924 925 /* 926 * Prevent escaping from chroot by putting the root under 927 * the working directory. Silently chdir to / if we aren't 928 * already there. 929 */ 930 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 931 /* 932 * XXX would be more failsafe to change directory to a 933 * deadfs node here instead 934 */ 935 vrele(cwdi->cwdi_cdir); 936 VREF(vp); 937 cwdi->cwdi_cdir = vp; 938 } 939 940 return (0); 941 } 942 943 /* 944 * Common routine for chroot and chdir. 945 */ 946 static int 947 change_dir(ndp, p) 948 register struct nameidata *ndp; 949 struct proc *p; 950 { 951 struct vnode *vp; 952 int error; 953 954 if ((error = namei(ndp)) != 0) 955 return (error); 956 vp = ndp->ni_vp; 957 if (vp->v_type != VDIR) 958 error = ENOTDIR; 959 else 960 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 961 962 if (error) 963 vput(vp); 964 else 965 VOP_UNLOCK(vp, 0); 966 return (error); 967 } 968 969 /* 970 * Check permissions, allocate an open file structure, 971 * and call the device open routine if any. 972 */ 973 int 974 sys_open(p, v, retval) 975 struct proc *p; 976 void *v; 977 register_t *retval; 978 { 979 register struct sys_open_args /* { 980 syscallarg(const char *) path; 981 syscallarg(int) flags; 982 syscallarg(int) mode; 983 } */ *uap = v; 984 struct cwdinfo *cwdi = p->p_cwdi; 985 struct filedesc *fdp = p->p_fd; 986 struct file *fp; 987 struct vnode *vp; 988 int flags, cmode; 989 int type, indx, error; 990 struct flock lf; 991 struct nameidata nd; 992 993 flags = FFLAGS(SCARG(uap, flags)); 994 if ((flags & (FREAD | FWRITE)) == 0) 995 return (EINVAL); 996 /* falloc() will use the file descriptor for us */ 997 if ((error = falloc(p, &fp, &indx)) != 0) 998 return (error); 999 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1000 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1001 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1002 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1003 FILE_UNUSE(fp, p); 1004 ffree(fp); 1005 if ((error == ENODEV || error == ENXIO) && 1006 p->p_dupfd >= 0 && /* XXX from fdopen */ 1007 (error = 1008 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1009 *retval = indx; 1010 return (0); 1011 } 1012 if (error == ERESTART) 1013 error = EINTR; 1014 fdp->fd_ofiles[indx] = NULL; 1015 return (error); 1016 } 1017 p->p_dupfd = 0; 1018 vp = nd.ni_vp; 1019 fp->f_flag = flags & FMASK; 1020 fp->f_type = DTYPE_VNODE; 1021 fp->f_ops = &vnops; 1022 fp->f_data = (caddr_t)vp; 1023 if (flags & (O_EXLOCK | O_SHLOCK)) { 1024 lf.l_whence = SEEK_SET; 1025 lf.l_start = 0; 1026 lf.l_len = 0; 1027 if (flags & O_EXLOCK) 1028 lf.l_type = F_WRLCK; 1029 else 1030 lf.l_type = F_RDLCK; 1031 type = F_FLOCK; 1032 if ((flags & FNONBLOCK) == 0) 1033 type |= F_WAIT; 1034 VOP_UNLOCK(vp, 0); 1035 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1036 if (error) { 1037 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1038 FILE_UNUSE(fp, p); 1039 ffree(fp); 1040 fdp->fd_ofiles[indx] = NULL; 1041 return (error); 1042 } 1043 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1044 fp->f_flag |= FHASLOCK; 1045 } 1046 VOP_UNLOCK(vp, 0); 1047 *retval = indx; 1048 FILE_UNUSE(fp, p); 1049 return (0); 1050 } 1051 1052 /* 1053 * Get file handle system call 1054 */ 1055 int 1056 sys_getfh(p, v, retval) 1057 struct proc *p; 1058 register void *v; 1059 register_t *retval; 1060 { 1061 register struct sys_getfh_args /* { 1062 syscallarg(char *) fname; 1063 syscallarg(fhandle_t *) fhp; 1064 } */ *uap = v; 1065 register struct vnode *vp; 1066 fhandle_t fh; 1067 int error; 1068 struct nameidata nd; 1069 1070 /* 1071 * Must be super user 1072 */ 1073 error = suser(p->p_ucred, &p->p_acflag); 1074 if (error) 1075 return (error); 1076 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1077 SCARG(uap, fname), p); 1078 error = namei(&nd); 1079 if (error) 1080 return (error); 1081 vp = nd.ni_vp; 1082 memset((caddr_t)&fh, 0, sizeof(fh)); 1083 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1084 error = VFS_VPTOFH(vp, &fh.fh_fid); 1085 vput(vp); 1086 if (error) 1087 return (error); 1088 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1089 return (error); 1090 } 1091 1092 /* 1093 * Open a file given a file handle. 1094 * 1095 * Check permissions, allocate an open file structure, 1096 * and call the device open routine if any. 1097 */ 1098 int 1099 sys_fhopen(p, v, retval) 1100 struct proc *p; 1101 void *v; 1102 register_t *retval; 1103 { 1104 register struct sys_fhopen_args /* { 1105 syscallarg(const fhandle_t *) fhp; 1106 syscallarg(int) flags; 1107 } */ *uap = v; 1108 struct filedesc *fdp = p->p_fd; 1109 struct file *fp; 1110 struct vnode *vp = NULL; 1111 struct mount *mp; 1112 struct ucred *cred = p->p_ucred; 1113 int flags; 1114 struct file *nfp; 1115 int type, indx, error=0; 1116 struct flock lf; 1117 struct vattr va; 1118 fhandle_t fh; 1119 1120 /* 1121 * Must be super user 1122 */ 1123 if ((error = suser(p->p_ucred, &p->p_acflag))) 1124 return (error); 1125 1126 flags = FFLAGS(SCARG(uap, flags)); 1127 if ((flags & (FREAD | FWRITE)) == 0) 1128 return (EINVAL); 1129 if ((flags & O_CREAT)) 1130 return (EINVAL); 1131 /* falloc() will use the file descriptor for us */ 1132 if ((error = falloc(p, &nfp, &indx)) != 0) 1133 return (error); 1134 fp = nfp; 1135 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1136 goto bad; 1137 1138 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1139 error = ESTALE; 1140 goto bad; 1141 } 1142 1143 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1144 vp = NULL; /* most likely unnecessary sanity for bad: */ 1145 goto bad; 1146 } 1147 1148 /* Now do an effective vn_open */ 1149 1150 if (vp->v_type == VSOCK) { 1151 error = EOPNOTSUPP; 1152 goto bad; 1153 } 1154 if (flags & FREAD) { 1155 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1156 goto bad; 1157 } 1158 if (flags & (FWRITE | O_TRUNC)) { 1159 if (vp->v_type == VDIR) { 1160 error = EISDIR; 1161 goto bad; 1162 } 1163 if ((error = vn_writechk(vp)) != 0 || 1164 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1165 goto bad; 1166 } 1167 if (flags & O_TRUNC) { 1168 VOP_UNLOCK(vp, 0); /* XXX */ 1169 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1170 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1171 VATTR_NULL(&va); 1172 va.va_size = 0; 1173 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1174 goto bad; 1175 } 1176 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1177 goto bad; 1178 if (flags & FWRITE) 1179 vp->v_writecount++; 1180 1181 /* done with modified vn_open, now finish what sys_open does. */ 1182 1183 fp->f_flag = flags & FMASK; 1184 fp->f_type = DTYPE_VNODE; 1185 fp->f_ops = &vnops; 1186 fp->f_data = (caddr_t)vp; 1187 if (flags & (O_EXLOCK | O_SHLOCK)) { 1188 lf.l_whence = SEEK_SET; 1189 lf.l_start = 0; 1190 lf.l_len = 0; 1191 if (flags & O_EXLOCK) 1192 lf.l_type = F_WRLCK; 1193 else 1194 lf.l_type = F_RDLCK; 1195 type = F_FLOCK; 1196 if ((flags & FNONBLOCK) == 0) 1197 type |= F_WAIT; 1198 VOP_UNLOCK(vp, 0); 1199 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1200 if (error) { 1201 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1202 FILE_UNUSE(fp, p); 1203 ffree(fp); 1204 fdp->fd_ofiles[indx] = NULL; 1205 return (error); 1206 } 1207 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1208 fp->f_flag |= FHASLOCK; 1209 } 1210 VOP_UNLOCK(vp, 0); 1211 *retval = indx; 1212 FILE_UNUSE(fp, p); 1213 return (0); 1214 1215 bad: 1216 FILE_UNUSE(fp, p); 1217 ffree(fp); 1218 fdp->fd_ofiles[indx] = NULL; 1219 if (vp != NULL) 1220 vput(vp); 1221 return (error); 1222 } 1223 1224 /* ARGSUSED */ 1225 int 1226 sys_fhstat(p, v, retval) 1227 struct proc *p; 1228 void *v; 1229 register_t *retval; 1230 { 1231 register struct sys_fhstat_args /* { 1232 syscallarg(const fhandle_t *) fhp; 1233 syscallarg(struct stat *) sb; 1234 } */ *uap = v; 1235 struct stat sb; 1236 int error; 1237 fhandle_t fh; 1238 struct mount *mp; 1239 struct vnode *vp; 1240 1241 /* 1242 * Must be super user 1243 */ 1244 if ((error = suser(p->p_ucred, &p->p_acflag))) 1245 return (error); 1246 1247 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1248 return (error); 1249 1250 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1251 return (ESTALE); 1252 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1253 return (error); 1254 error = vn_stat(vp, &sb, p); 1255 vput(vp); 1256 if (error) 1257 return (error); 1258 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1259 return (error); 1260 } 1261 1262 /* ARGSUSED */ 1263 int 1264 sys_fhstatfs(p, v, retval) 1265 struct proc *p; 1266 void *v; 1267 register_t *retval; 1268 { 1269 register struct sys_fhstatfs_args /* 1270 syscallarg(const fhandle_t *) fhp; 1271 syscallarg(struct statfs *) buf; 1272 } */ *uap = v; 1273 struct statfs sp; 1274 fhandle_t fh; 1275 struct mount *mp; 1276 struct vnode *vp; 1277 int error; 1278 1279 /* 1280 * Must be super user 1281 */ 1282 if ((error = suser(p->p_ucred, &p->p_acflag))) 1283 return (error); 1284 1285 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1286 return (error); 1287 1288 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1289 return (ESTALE); 1290 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1291 return (error); 1292 mp = vp->v_mount; 1293 vput(vp); 1294 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1295 return (error); 1296 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1297 sp.f_oflags = sp.f_flags & 0xffff; 1298 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1299 } 1300 1301 /* 1302 * Create a special file. 1303 */ 1304 /* ARGSUSED */ 1305 int 1306 sys_mknod(p, v, retval) 1307 struct proc *p; 1308 void *v; 1309 register_t *retval; 1310 { 1311 register struct sys_mknod_args /* { 1312 syscallarg(const char *) path; 1313 syscallarg(int) mode; 1314 syscallarg(int) dev; 1315 } */ *uap = v; 1316 register struct vnode *vp; 1317 struct vattr vattr; 1318 int error; 1319 int whiteout = 0; 1320 struct nameidata nd; 1321 1322 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1323 return (error); 1324 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1325 if ((error = namei(&nd)) != 0) 1326 return (error); 1327 vp = nd.ni_vp; 1328 if (vp != NULL) 1329 error = EEXIST; 1330 else { 1331 VATTR_NULL(&vattr); 1332 vattr.va_mode = 1333 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1334 vattr.va_rdev = SCARG(uap, dev); 1335 whiteout = 0; 1336 1337 switch (SCARG(uap, mode) & S_IFMT) { 1338 case S_IFMT: /* used by badsect to flag bad sectors */ 1339 vattr.va_type = VBAD; 1340 break; 1341 case S_IFCHR: 1342 vattr.va_type = VCHR; 1343 break; 1344 case S_IFBLK: 1345 vattr.va_type = VBLK; 1346 break; 1347 case S_IFWHT: 1348 whiteout = 1; 1349 break; 1350 default: 1351 error = EINVAL; 1352 break; 1353 } 1354 } 1355 if (!error) { 1356 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1357 if (whiteout) { 1358 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1359 if (error) 1360 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1361 vput(nd.ni_dvp); 1362 } else { 1363 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1364 &nd.ni_cnd, &vattr); 1365 } 1366 } else { 1367 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1368 if (nd.ni_dvp == vp) 1369 vrele(nd.ni_dvp); 1370 else 1371 vput(nd.ni_dvp); 1372 if (vp) 1373 vrele(vp); 1374 } 1375 return (error); 1376 } 1377 1378 /* 1379 * Create a named pipe. 1380 */ 1381 /* ARGSUSED */ 1382 int 1383 sys_mkfifo(p, v, retval) 1384 struct proc *p; 1385 void *v; 1386 register_t *retval; 1387 { 1388 register struct sys_mkfifo_args /* { 1389 syscallarg(const char *) path; 1390 syscallarg(int) mode; 1391 } */ *uap = v; 1392 struct vattr vattr; 1393 int error; 1394 struct nameidata nd; 1395 1396 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1397 if ((error = namei(&nd)) != 0) 1398 return (error); 1399 if (nd.ni_vp != NULL) { 1400 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1401 if (nd.ni_dvp == nd.ni_vp) 1402 vrele(nd.ni_dvp); 1403 else 1404 vput(nd.ni_dvp); 1405 vrele(nd.ni_vp); 1406 return (EEXIST); 1407 } 1408 VATTR_NULL(&vattr); 1409 vattr.va_type = VFIFO; 1410 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1411 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1412 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1413 } 1414 1415 /* 1416 * Make a hard file link. 1417 */ 1418 /* ARGSUSED */ 1419 int 1420 sys_link(p, v, retval) 1421 struct proc *p; 1422 void *v; 1423 register_t *retval; 1424 { 1425 register struct sys_link_args /* { 1426 syscallarg(const char *) path; 1427 syscallarg(const char *) link; 1428 } */ *uap = v; 1429 register struct vnode *vp; 1430 struct nameidata nd; 1431 int error; 1432 1433 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1434 if ((error = namei(&nd)) != 0) 1435 return (error); 1436 vp = nd.ni_vp; 1437 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1438 if ((error = namei(&nd)) != 0) 1439 goto out; 1440 if (nd.ni_vp) { 1441 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1442 if (nd.ni_dvp == nd.ni_vp) 1443 vrele(nd.ni_dvp); 1444 else 1445 vput(nd.ni_dvp); 1446 vrele(nd.ni_vp); 1447 error = EEXIST; 1448 goto out; 1449 } 1450 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1451 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1452 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1453 out: 1454 vrele(vp); 1455 return (error); 1456 } 1457 1458 /* 1459 * Make a symbolic link. 1460 */ 1461 /* ARGSUSED */ 1462 int 1463 sys_symlink(p, v, retval) 1464 struct proc *p; 1465 void *v; 1466 register_t *retval; 1467 { 1468 register struct sys_symlink_args /* { 1469 syscallarg(const char *) path; 1470 syscallarg(const char *) link; 1471 } */ *uap = v; 1472 struct vattr vattr; 1473 char *path; 1474 int error; 1475 struct nameidata nd; 1476 1477 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1478 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1479 if (error) 1480 goto out; 1481 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1482 if ((error = namei(&nd)) != 0) 1483 goto out; 1484 if (nd.ni_vp) { 1485 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1486 if (nd.ni_dvp == nd.ni_vp) 1487 vrele(nd.ni_dvp); 1488 else 1489 vput(nd.ni_dvp); 1490 vrele(nd.ni_vp); 1491 error = EEXIST; 1492 goto out; 1493 } 1494 VATTR_NULL(&vattr); 1495 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1496 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1497 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1498 out: 1499 FREE(path, M_NAMEI); 1500 return (error); 1501 } 1502 1503 /* 1504 * Delete a whiteout from the filesystem. 1505 */ 1506 /* ARGSUSED */ 1507 int 1508 sys_undelete(p, v, retval) 1509 struct proc *p; 1510 void *v; 1511 register_t *retval; 1512 { 1513 register struct sys_undelete_args /* { 1514 syscallarg(const char *) path; 1515 } */ *uap = v; 1516 int error; 1517 struct nameidata nd; 1518 1519 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1520 SCARG(uap, path), p); 1521 error = namei(&nd); 1522 if (error) 1523 return (error); 1524 1525 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1526 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1527 if (nd.ni_dvp == nd.ni_vp) 1528 vrele(nd.ni_dvp); 1529 else 1530 vput(nd.ni_dvp); 1531 if (nd.ni_vp) 1532 vrele(nd.ni_vp); 1533 return (EEXIST); 1534 } 1535 1536 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1537 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1538 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1539 vput(nd.ni_dvp); 1540 return (error); 1541 } 1542 1543 /* 1544 * Delete a name from the filesystem. 1545 */ 1546 /* ARGSUSED */ 1547 int 1548 sys_unlink(p, v, retval) 1549 struct proc *p; 1550 void *v; 1551 register_t *retval; 1552 { 1553 struct sys_unlink_args /* { 1554 syscallarg(const char *) path; 1555 } */ *uap = v; 1556 register struct vnode *vp; 1557 int error; 1558 struct nameidata nd; 1559 1560 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1561 SCARG(uap, path), p); 1562 if ((error = namei(&nd)) != 0) 1563 return (error); 1564 vp = nd.ni_vp; 1565 1566 /* 1567 * The root of a mounted filesystem cannot be deleted. 1568 */ 1569 if (vp->v_flag & VROOT) { 1570 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1571 if (nd.ni_dvp == vp) 1572 vrele(nd.ni_dvp); 1573 else 1574 vput(nd.ni_dvp); 1575 vput(vp); 1576 error = EBUSY; 1577 goto out; 1578 } 1579 1580 (void)uvm_vnp_uncache(vp); 1581 1582 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1583 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1584 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1585 out: 1586 return (error); 1587 } 1588 1589 /* 1590 * Reposition read/write file offset. 1591 */ 1592 int 1593 sys_lseek(p, v, retval) 1594 struct proc *p; 1595 void *v; 1596 register_t *retval; 1597 { 1598 register struct sys_lseek_args /* { 1599 syscallarg(int) fd; 1600 syscallarg(int) pad; 1601 syscallarg(off_t) offset; 1602 syscallarg(int) whence; 1603 } */ *uap = v; 1604 struct ucred *cred = p->p_ucred; 1605 register struct filedesc *fdp = p->p_fd; 1606 register struct file *fp; 1607 struct vnode *vp; 1608 struct vattr vattr; 1609 register off_t newoff; 1610 int error; 1611 1612 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1613 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1614 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1615 return (EBADF); 1616 1617 FILE_USE(fp); 1618 1619 vp = (struct vnode *)fp->f_data; 1620 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1621 error = ESPIPE; 1622 goto out; 1623 } 1624 1625 switch (SCARG(uap, whence)) { 1626 case SEEK_CUR: 1627 newoff = fp->f_offset + SCARG(uap, offset); 1628 break; 1629 case SEEK_END: 1630 error = VOP_GETATTR(vp, &vattr, cred, p); 1631 if (error) 1632 goto out; 1633 newoff = SCARG(uap, offset) + vattr.va_size; 1634 break; 1635 case SEEK_SET: 1636 newoff = SCARG(uap, offset); 1637 break; 1638 default: 1639 error = EINVAL; 1640 goto out; 1641 } 1642 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1643 goto out; 1644 1645 *(off_t *)retval = fp->f_offset = newoff; 1646 out: 1647 FILE_UNUSE(fp, p); 1648 return (error); 1649 } 1650 1651 /* 1652 * Positional read system call. 1653 */ 1654 int 1655 sys_pread(p, v, retval) 1656 struct proc *p; 1657 void *v; 1658 register_t *retval; 1659 { 1660 struct sys_pread_args /* { 1661 syscallarg(int) fd; 1662 syscallarg(void *) buf; 1663 syscallarg(size_t) nbyte; 1664 syscallarg(off_t) offset; 1665 } */ *uap = v; 1666 struct filedesc *fdp = p->p_fd; 1667 struct file *fp; 1668 struct vnode *vp; 1669 off_t offset; 1670 int error, fd = SCARG(uap, fd); 1671 1672 if ((u_int)fd >= fdp->fd_nfiles || 1673 (fp = fdp->fd_ofiles[fd]) == NULL || 1674 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1675 (fp->f_flag & FREAD) == 0) 1676 return (EBADF); 1677 1678 FILE_USE(fp); 1679 1680 vp = (struct vnode *)fp->f_data; 1681 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1682 error = ESPIPE; 1683 goto out; 1684 } 1685 1686 offset = SCARG(uap, offset); 1687 1688 /* 1689 * XXX This works because no file systems actually 1690 * XXX take any action on the seek operation. 1691 */ 1692 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1693 goto out; 1694 1695 /* dofileread() will unuse the descriptor for us */ 1696 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1697 &offset, 0, retval)); 1698 1699 out: 1700 FILE_UNUSE(fp, p); 1701 return (error); 1702 } 1703 1704 /* 1705 * Positional scatter read system call. 1706 */ 1707 int 1708 sys_preadv(p, v, retval) 1709 struct proc *p; 1710 void *v; 1711 register_t *retval; 1712 { 1713 struct sys_preadv_args /* { 1714 syscallarg(int) fd; 1715 syscallarg(const struct iovec *) iovp; 1716 syscallarg(int) iovcnt; 1717 syscallarg(off_t) offset; 1718 } */ *uap = v; 1719 struct filedesc *fdp = p->p_fd; 1720 struct file *fp; 1721 struct vnode *vp; 1722 off_t offset; 1723 int error, fd = SCARG(uap, fd); 1724 1725 if ((u_int)fd >= fdp->fd_nfiles || 1726 (fp = fdp->fd_ofiles[fd]) == NULL || 1727 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1728 (fp->f_flag & FREAD) == 0) 1729 return (EBADF); 1730 1731 FILE_USE(fp); 1732 1733 vp = (struct vnode *)fp->f_data; 1734 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1735 error = ESPIPE; 1736 goto out; 1737 } 1738 1739 offset = SCARG(uap, offset); 1740 1741 /* 1742 * XXX This works because no file systems actually 1743 * XXX take any action on the seek operation. 1744 */ 1745 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1746 goto out; 1747 1748 /* dofilereadv() will unuse the descriptor for us */ 1749 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1750 &offset, 0, retval)); 1751 1752 out: 1753 FILE_UNUSE(fp, p); 1754 return (error); 1755 } 1756 1757 /* 1758 * Positional write system call. 1759 */ 1760 int 1761 sys_pwrite(p, v, retval) 1762 struct proc *p; 1763 void *v; 1764 register_t *retval; 1765 { 1766 struct sys_pwrite_args /* { 1767 syscallarg(int) fd; 1768 syscallarg(const void *) buf; 1769 syscallarg(size_t) nbyte; 1770 syscallarg(off_t) offset; 1771 } */ *uap = v; 1772 struct filedesc *fdp = p->p_fd; 1773 struct file *fp; 1774 struct vnode *vp; 1775 off_t offset; 1776 int error, fd = SCARG(uap, fd); 1777 1778 if ((u_int)fd >= fdp->fd_nfiles || 1779 (fp = fdp->fd_ofiles[fd]) == NULL || 1780 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1781 (fp->f_flag & FWRITE) == 0) 1782 return (EBADF); 1783 1784 FILE_USE(fp); 1785 1786 vp = (struct vnode *)fp->f_data; 1787 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1788 error = ESPIPE; 1789 goto out; 1790 } 1791 1792 offset = SCARG(uap, offset); 1793 1794 /* 1795 * XXX This works because no file systems actually 1796 * XXX take any action on the seek operation. 1797 */ 1798 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1799 goto out; 1800 1801 /* dofilewrite() will unuse the descriptor for us */ 1802 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1803 &offset, 0, retval)); 1804 1805 out: 1806 FILE_UNUSE(fp, p); 1807 return (error); 1808 } 1809 1810 /* 1811 * Positional gather write system call. 1812 */ 1813 int 1814 sys_pwritev(p, v, retval) 1815 struct proc *p; 1816 void *v; 1817 register_t *retval; 1818 { 1819 struct sys_pwritev_args /* { 1820 syscallarg(int) fd; 1821 syscallarg(const struct iovec *) iovp; 1822 syscallarg(int) iovcnt; 1823 syscallarg(off_t) offset; 1824 } */ *uap = v; 1825 struct filedesc *fdp = p->p_fd; 1826 struct file *fp; 1827 struct vnode *vp; 1828 off_t offset; 1829 int error, fd = SCARG(uap, fd); 1830 1831 if ((u_int)fd >= fdp->fd_nfiles || 1832 (fp = fdp->fd_ofiles[fd]) == NULL || 1833 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1834 (fp->f_flag & FWRITE) == 0) 1835 return (EBADF); 1836 1837 FILE_USE(fp); 1838 1839 vp = (struct vnode *)fp->f_data; 1840 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1841 error = ESPIPE; 1842 goto out; 1843 } 1844 1845 offset = SCARG(uap, offset); 1846 1847 /* 1848 * XXX This works because no file systems actually 1849 * XXX take any action on the seek operation. 1850 */ 1851 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1852 goto out; 1853 1854 /* dofilewritev() will unuse the descriptor for us */ 1855 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1856 &offset, 0, retval)); 1857 1858 out: 1859 FILE_UNUSE(fp, p); 1860 return (error); 1861 } 1862 1863 /* 1864 * Check access permissions. 1865 */ 1866 int 1867 sys_access(p, v, retval) 1868 struct proc *p; 1869 void *v; 1870 register_t *retval; 1871 { 1872 register struct sys_access_args /* { 1873 syscallarg(const char *) path; 1874 syscallarg(int) flags; 1875 } */ *uap = v; 1876 register struct ucred *cred = p->p_ucred; 1877 register struct vnode *vp; 1878 int error, flags, t_gid, t_uid; 1879 struct nameidata nd; 1880 1881 t_uid = cred->cr_uid; 1882 t_gid = cred->cr_gid; 1883 cred->cr_uid = p->p_cred->p_ruid; 1884 cred->cr_gid = p->p_cred->p_rgid; 1885 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1886 SCARG(uap, path), p); 1887 if ((error = namei(&nd)) != 0) 1888 goto out1; 1889 vp = nd.ni_vp; 1890 1891 /* Flags == 0 means only check for existence. */ 1892 if (SCARG(uap, flags)) { 1893 flags = 0; 1894 if (SCARG(uap, flags) & R_OK) 1895 flags |= VREAD; 1896 if (SCARG(uap, flags) & W_OK) 1897 flags |= VWRITE; 1898 if (SCARG(uap, flags) & X_OK) 1899 flags |= VEXEC; 1900 1901 error = VOP_ACCESS(vp, flags, cred, p); 1902 if (!error && (flags & VWRITE)) 1903 error = vn_writechk(vp); 1904 } 1905 vput(vp); 1906 out1: 1907 cred->cr_uid = t_uid; 1908 cred->cr_gid = t_gid; 1909 return (error); 1910 } 1911 1912 /* 1913 * Get file status; this version follows links. 1914 */ 1915 /* ARGSUSED */ 1916 int 1917 sys___stat13(p, v, retval) 1918 struct proc *p; 1919 void *v; 1920 register_t *retval; 1921 { 1922 register struct sys___stat13_args /* { 1923 syscallarg(const char *) path; 1924 syscallarg(struct stat *) ub; 1925 } */ *uap = v; 1926 struct stat sb; 1927 int error; 1928 struct nameidata nd; 1929 1930 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1931 SCARG(uap, path), p); 1932 if ((error = namei(&nd)) != 0) 1933 return (error); 1934 error = vn_stat(nd.ni_vp, &sb, p); 1935 vput(nd.ni_vp); 1936 if (error) 1937 return (error); 1938 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1939 return (error); 1940 } 1941 1942 /* 1943 * Get file status; this version does not follow links. 1944 */ 1945 /* ARGSUSED */ 1946 int 1947 sys___lstat13(p, v, retval) 1948 struct proc *p; 1949 void *v; 1950 register_t *retval; 1951 { 1952 register struct sys___lstat13_args /* { 1953 syscallarg(const char *) path; 1954 syscallarg(struct stat *) ub; 1955 } */ *uap = v; 1956 struct stat sb; 1957 int error; 1958 struct nameidata nd; 1959 1960 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1961 SCARG(uap, path), p); 1962 if ((error = namei(&nd)) != 0) 1963 return (error); 1964 error = vn_stat(nd.ni_vp, &sb, p); 1965 vput(nd.ni_vp); 1966 if (error) 1967 return (error); 1968 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1969 return (error); 1970 } 1971 1972 /* 1973 * Get configurable pathname variables. 1974 */ 1975 /* ARGSUSED */ 1976 int 1977 sys_pathconf(p, v, retval) 1978 struct proc *p; 1979 void *v; 1980 register_t *retval; 1981 { 1982 register struct sys_pathconf_args /* { 1983 syscallarg(const char *) path; 1984 syscallarg(int) name; 1985 } */ *uap = v; 1986 int error; 1987 struct nameidata nd; 1988 1989 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1990 SCARG(uap, path), p); 1991 if ((error = namei(&nd)) != 0) 1992 return (error); 1993 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1994 vput(nd.ni_vp); 1995 return (error); 1996 } 1997 1998 /* 1999 * Return target name of a symbolic link. 2000 */ 2001 /* ARGSUSED */ 2002 int 2003 sys_readlink(p, v, retval) 2004 struct proc *p; 2005 void *v; 2006 register_t *retval; 2007 { 2008 register struct sys_readlink_args /* { 2009 syscallarg(const char *) path; 2010 syscallarg(char *) buf; 2011 syscallarg(size_t) count; 2012 } */ *uap = v; 2013 register struct vnode *vp; 2014 struct iovec aiov; 2015 struct uio auio; 2016 int error; 2017 struct nameidata nd; 2018 2019 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2020 SCARG(uap, path), p); 2021 if ((error = namei(&nd)) != 0) 2022 return (error); 2023 vp = nd.ni_vp; 2024 if (vp->v_type != VLNK) 2025 error = EINVAL; 2026 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2027 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2028 aiov.iov_base = SCARG(uap, buf); 2029 aiov.iov_len = SCARG(uap, count); 2030 auio.uio_iov = &aiov; 2031 auio.uio_iovcnt = 1; 2032 auio.uio_offset = 0; 2033 auio.uio_rw = UIO_READ; 2034 auio.uio_segflg = UIO_USERSPACE; 2035 auio.uio_procp = p; 2036 auio.uio_resid = SCARG(uap, count); 2037 error = VOP_READLINK(vp, &auio, p->p_ucred); 2038 } 2039 vput(vp); 2040 *retval = SCARG(uap, count) - auio.uio_resid; 2041 return (error); 2042 } 2043 2044 /* 2045 * Change flags of a file given a path name. 2046 */ 2047 /* ARGSUSED */ 2048 int 2049 sys_chflags(p, v, retval) 2050 struct proc *p; 2051 void *v; 2052 register_t *retval; 2053 { 2054 register struct sys_chflags_args /* { 2055 syscallarg(const char *) path; 2056 syscallarg(u_long) flags; 2057 } */ *uap = v; 2058 register struct vnode *vp; 2059 struct vattr vattr; 2060 int error; 2061 struct nameidata nd; 2062 2063 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2064 if ((error = namei(&nd)) != 0) 2065 return (error); 2066 vp = nd.ni_vp; 2067 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2068 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2069 /* Non-superusers cannot change the flags on devices, even if they 2070 own them. */ 2071 if (suser(p->p_ucred, &p->p_acflag)) { 2072 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2073 goto out; 2074 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2075 error = EINVAL; 2076 goto out; 2077 } 2078 } 2079 VATTR_NULL(&vattr); 2080 vattr.va_flags = SCARG(uap, flags); 2081 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2082 out: 2083 vput(vp); 2084 return (error); 2085 } 2086 2087 /* 2088 * Change flags of a file given a file descriptor. 2089 */ 2090 /* ARGSUSED */ 2091 int 2092 sys_fchflags(p, v, retval) 2093 struct proc *p; 2094 void *v; 2095 register_t *retval; 2096 { 2097 register struct sys_fchflags_args /* { 2098 syscallarg(int) fd; 2099 syscallarg(u_long) flags; 2100 } */ *uap = v; 2101 struct vattr vattr; 2102 struct vnode *vp; 2103 struct file *fp; 2104 int error; 2105 2106 /* getvnode() will use the descriptor for us */ 2107 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2108 return (error); 2109 vp = (struct vnode *)fp->f_data; 2110 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2111 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2112 /* Non-superusers cannot change the flags on devices, even if they 2113 own them. */ 2114 if (suser(p->p_ucred, &p->p_acflag)) { 2115 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) 2116 != 0) 2117 goto out; 2118 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2119 error = EINVAL; 2120 goto out; 2121 } 2122 } 2123 VATTR_NULL(&vattr); 2124 vattr.va_flags = SCARG(uap, flags); 2125 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2126 out: 2127 VOP_UNLOCK(vp, 0); 2128 FILE_UNUSE(fp, p); 2129 return (error); 2130 } 2131 2132 /* 2133 * Change mode of a file given path name; this version follows links. 2134 */ 2135 /* ARGSUSED */ 2136 int 2137 sys_chmod(p, v, retval) 2138 struct proc *p; 2139 void *v; 2140 register_t *retval; 2141 { 2142 register struct sys_chmod_args /* { 2143 syscallarg(const char *) path; 2144 syscallarg(int) mode; 2145 } */ *uap = v; 2146 int error; 2147 struct nameidata nd; 2148 2149 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2150 if ((error = namei(&nd)) != 0) 2151 return (error); 2152 2153 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2154 2155 vrele(nd.ni_vp); 2156 return (error); 2157 } 2158 2159 /* 2160 * Change mode of a file given a file descriptor. 2161 */ 2162 /* ARGSUSED */ 2163 int 2164 sys_fchmod(p, v, retval) 2165 struct proc *p; 2166 void *v; 2167 register_t *retval; 2168 { 2169 register struct sys_fchmod_args /* { 2170 syscallarg(int) fd; 2171 syscallarg(int) mode; 2172 } */ *uap = v; 2173 struct file *fp; 2174 int error; 2175 2176 /* getvnode() will use the descriptor for us */ 2177 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2178 return (error); 2179 2180 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2181 FILE_UNUSE(fp, p); 2182 return (error); 2183 } 2184 2185 /* 2186 * Change mode of a file given path name; this version does not follow links. 2187 */ 2188 /* ARGSUSED */ 2189 int 2190 sys_lchmod(p, v, retval) 2191 struct proc *p; 2192 void *v; 2193 register_t *retval; 2194 { 2195 register struct sys_lchmod_args /* { 2196 syscallarg(const char *) path; 2197 syscallarg(int) mode; 2198 } */ *uap = v; 2199 int error; 2200 struct nameidata nd; 2201 2202 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2203 if ((error = namei(&nd)) != 0) 2204 return (error); 2205 2206 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2207 2208 vrele(nd.ni_vp); 2209 return (error); 2210 } 2211 2212 /* 2213 * Common routine to set mode given a vnode. 2214 */ 2215 static int 2216 change_mode(vp, mode, p) 2217 struct vnode *vp; 2218 int mode; 2219 struct proc *p; 2220 { 2221 struct vattr vattr; 2222 int error; 2223 2224 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2225 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2226 VATTR_NULL(&vattr); 2227 vattr.va_mode = mode & ALLPERMS; 2228 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2229 VOP_UNLOCK(vp, 0); 2230 return (error); 2231 } 2232 2233 /* 2234 * Set ownership given a path name; this version follows links. 2235 */ 2236 /* ARGSUSED */ 2237 int 2238 sys_chown(p, v, retval) 2239 struct proc *p; 2240 void *v; 2241 register_t *retval; 2242 { 2243 register struct sys_chown_args /* { 2244 syscallarg(const char *) path; 2245 syscallarg(uid_t) uid; 2246 syscallarg(gid_t) gid; 2247 } */ *uap = v; 2248 int error; 2249 struct nameidata nd; 2250 2251 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2252 if ((error = namei(&nd)) != 0) 2253 return (error); 2254 2255 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2256 2257 vrele(nd.ni_vp); 2258 return (error); 2259 } 2260 2261 /* 2262 * Set ownership given a path name; this version follows links. 2263 * Provides POSIX semantics. 2264 */ 2265 /* ARGSUSED */ 2266 int 2267 sys___posix_chown(p, v, retval) 2268 struct proc *p; 2269 void *v; 2270 register_t *retval; 2271 { 2272 register struct sys_chown_args /* { 2273 syscallarg(const char *) path; 2274 syscallarg(uid_t) uid; 2275 syscallarg(gid_t) gid; 2276 } */ *uap = v; 2277 int error; 2278 struct nameidata nd; 2279 2280 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2281 if ((error = namei(&nd)) != 0) 2282 return (error); 2283 2284 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2285 2286 vrele(nd.ni_vp); 2287 return (error); 2288 } 2289 2290 /* 2291 * Set ownership given a file descriptor. 2292 */ 2293 /* ARGSUSED */ 2294 int 2295 sys_fchown(p, v, retval) 2296 struct proc *p; 2297 void *v; 2298 register_t *retval; 2299 { 2300 register struct sys_fchown_args /* { 2301 syscallarg(int) fd; 2302 syscallarg(uid_t) uid; 2303 syscallarg(gid_t) gid; 2304 } */ *uap = v; 2305 int error; 2306 struct file *fp; 2307 2308 /* getvnode() will use the descriptor for us */ 2309 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2310 return (error); 2311 2312 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2313 SCARG(uap, gid), p, 0); 2314 FILE_UNUSE(fp, p); 2315 return (error); 2316 } 2317 2318 /* 2319 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2320 */ 2321 /* ARGSUSED */ 2322 int 2323 sys___posix_fchown(p, v, retval) 2324 struct proc *p; 2325 void *v; 2326 register_t *retval; 2327 { 2328 register struct sys_fchown_args /* { 2329 syscallarg(int) fd; 2330 syscallarg(uid_t) uid; 2331 syscallarg(gid_t) gid; 2332 } */ *uap = v; 2333 int error; 2334 struct file *fp; 2335 2336 /* getvnode() will use the descriptor for us */ 2337 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2338 return (error); 2339 2340 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2341 SCARG(uap, gid), p, 1); 2342 FILE_UNUSE(fp, p); 2343 return (error); 2344 } 2345 2346 /* 2347 * Set ownership given a path name; this version does not follow links. 2348 */ 2349 /* ARGSUSED */ 2350 int 2351 sys_lchown(p, v, retval) 2352 struct proc *p; 2353 void *v; 2354 register_t *retval; 2355 { 2356 register struct sys_lchown_args /* { 2357 syscallarg(const char *) path; 2358 syscallarg(uid_t) uid; 2359 syscallarg(gid_t) gid; 2360 } */ *uap = v; 2361 int error; 2362 struct nameidata nd; 2363 2364 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2365 if ((error = namei(&nd)) != 0) 2366 return (error); 2367 2368 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2369 2370 vrele(nd.ni_vp); 2371 return (error); 2372 } 2373 2374 /* 2375 * Set ownership given a path name; this version does not follow links. 2376 * Provides POSIX/XPG semantics. 2377 */ 2378 /* ARGSUSED */ 2379 int 2380 sys___posix_lchown(p, v, retval) 2381 struct proc *p; 2382 void *v; 2383 register_t *retval; 2384 { 2385 register struct sys_lchown_args /* { 2386 syscallarg(const char *) path; 2387 syscallarg(uid_t) uid; 2388 syscallarg(gid_t) gid; 2389 } */ *uap = v; 2390 int error; 2391 struct nameidata nd; 2392 2393 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2394 if ((error = namei(&nd)) != 0) 2395 return (error); 2396 2397 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2398 2399 vrele(nd.ni_vp); 2400 return (error); 2401 } 2402 2403 /* 2404 * Common routine to set ownership given a vnode. 2405 */ 2406 static int 2407 change_owner(vp, uid, gid, p, posix_semantics) 2408 register struct vnode *vp; 2409 uid_t uid; 2410 gid_t gid; 2411 struct proc *p; 2412 int posix_semantics; 2413 { 2414 struct vattr vattr; 2415 mode_t newmode; 2416 int error; 2417 2418 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2419 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2420 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2421 goto out; 2422 2423 #define CHANGED(x) ((x) != -1) 2424 newmode = vattr.va_mode; 2425 if (posix_semantics) { 2426 /* 2427 * POSIX/XPG semantics: if the caller is not the super-user, 2428 * clear set-user-id and set-group-id bits. Both POSIX and 2429 * the XPG consider the behaviour for calls by the super-user 2430 * implementation-defined; we leave the set-user-id and set- 2431 * group-id settings intact in that case. 2432 */ 2433 if (suser(p->p_ucred, NULL) != 0) 2434 newmode &= ~(S_ISUID | S_ISGID); 2435 } else { 2436 /* 2437 * NetBSD semantics: when changing owner and/or group, 2438 * clear the respective bit(s). 2439 */ 2440 if (CHANGED(uid)) 2441 newmode &= ~S_ISUID; 2442 if (CHANGED(gid)) 2443 newmode &= ~S_ISGID; 2444 } 2445 /* Update va_mode iff altered. */ 2446 if (vattr.va_mode == newmode) 2447 newmode = VNOVAL; 2448 2449 VATTR_NULL(&vattr); 2450 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2451 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2452 vattr.va_mode = newmode; 2453 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2454 #undef CHANGED 2455 2456 out: 2457 VOP_UNLOCK(vp, 0); 2458 return (error); 2459 } 2460 2461 /* 2462 * Set the access and modification times given a path name; this 2463 * version follows links. 2464 */ 2465 /* ARGSUSED */ 2466 int 2467 sys_utimes(p, v, retval) 2468 struct proc *p; 2469 void *v; 2470 register_t *retval; 2471 { 2472 register struct sys_utimes_args /* { 2473 syscallarg(const char *) path; 2474 syscallarg(const struct timeval *) tptr; 2475 } */ *uap = v; 2476 int error; 2477 struct nameidata nd; 2478 2479 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2480 if ((error = namei(&nd)) != 0) 2481 return (error); 2482 2483 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2484 2485 vrele(nd.ni_vp); 2486 return (error); 2487 } 2488 2489 /* 2490 * Set the access and modification times given a file descriptor. 2491 */ 2492 /* ARGSUSED */ 2493 int 2494 sys_futimes(p, v, retval) 2495 struct proc *p; 2496 void *v; 2497 register_t *retval; 2498 { 2499 register struct sys_futimes_args /* { 2500 syscallarg(int) fd; 2501 syscallarg(const struct timeval *) tptr; 2502 } */ *uap = v; 2503 int error; 2504 struct file *fp; 2505 2506 /* getvnode() will use the descriptor for us */ 2507 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2508 return (error); 2509 2510 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2511 FILE_UNUSE(fp, p); 2512 return (error); 2513 } 2514 2515 /* 2516 * Set the access and modification times given a path name; this 2517 * version does not follow links. 2518 */ 2519 /* ARGSUSED */ 2520 int 2521 sys_lutimes(p, v, retval) 2522 struct proc *p; 2523 void *v; 2524 register_t *retval; 2525 { 2526 register struct sys_lutimes_args /* { 2527 syscallarg(const char *) path; 2528 syscallarg(const struct timeval *) tptr; 2529 } */ *uap = v; 2530 int error; 2531 struct nameidata nd; 2532 2533 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2534 if ((error = namei(&nd)) != 0) 2535 return (error); 2536 2537 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2538 2539 vrele(nd.ni_vp); 2540 return (error); 2541 } 2542 2543 /* 2544 * Common routine to set access and modification times given a vnode. 2545 */ 2546 static int 2547 change_utimes(vp, tptr, p) 2548 struct vnode *vp; 2549 const struct timeval *tptr; 2550 struct proc *p; 2551 { 2552 struct timeval tv[2]; 2553 struct vattr vattr; 2554 int error; 2555 2556 VATTR_NULL(&vattr); 2557 if (tptr == NULL) { 2558 microtime(&tv[0]); 2559 tv[1] = tv[0]; 2560 vattr.va_vaflags |= VA_UTIMES_NULL; 2561 } else { 2562 error = copyin(tptr, tv, sizeof(tv)); 2563 if (error) 2564 return (error); 2565 } 2566 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2567 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2568 vattr.va_atime.tv_sec = tv[0].tv_sec; 2569 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2570 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2571 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2572 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2573 VOP_UNLOCK(vp, 0); 2574 return (error); 2575 } 2576 2577 /* 2578 * Truncate a file given its path name. 2579 */ 2580 /* ARGSUSED */ 2581 int 2582 sys_truncate(p, v, retval) 2583 struct proc *p; 2584 void *v; 2585 register_t *retval; 2586 { 2587 register struct sys_truncate_args /* { 2588 syscallarg(const char *) path; 2589 syscallarg(int) pad; 2590 syscallarg(off_t) length; 2591 } */ *uap = v; 2592 register struct vnode *vp; 2593 struct vattr vattr; 2594 int error; 2595 struct nameidata nd; 2596 2597 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2598 if ((error = namei(&nd)) != 0) 2599 return (error); 2600 vp = nd.ni_vp; 2601 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2602 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2603 if (vp->v_type == VDIR) 2604 error = EISDIR; 2605 else if ((error = vn_writechk(vp)) == 0 && 2606 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2607 VATTR_NULL(&vattr); 2608 vattr.va_size = SCARG(uap, length); 2609 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2610 } 2611 vput(vp); 2612 return (error); 2613 } 2614 2615 /* 2616 * Truncate a file given a file descriptor. 2617 */ 2618 /* ARGSUSED */ 2619 int 2620 sys_ftruncate(p, v, retval) 2621 struct proc *p; 2622 void *v; 2623 register_t *retval; 2624 { 2625 register struct sys_ftruncate_args /* { 2626 syscallarg(int) fd; 2627 syscallarg(int) pad; 2628 syscallarg(off_t) length; 2629 } */ *uap = v; 2630 struct vattr vattr; 2631 struct vnode *vp; 2632 struct file *fp; 2633 int error; 2634 2635 /* getvnode() will use the descriptor for us */ 2636 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2637 return (error); 2638 if ((fp->f_flag & FWRITE) == 0) { 2639 error = EINVAL; 2640 goto out; 2641 } 2642 vp = (struct vnode *)fp->f_data; 2643 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2644 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2645 if (vp->v_type == VDIR) 2646 error = EISDIR; 2647 else if ((error = vn_writechk(vp)) == 0) { 2648 VATTR_NULL(&vattr); 2649 vattr.va_size = SCARG(uap, length); 2650 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2651 } 2652 VOP_UNLOCK(vp, 0); 2653 out: 2654 FILE_UNUSE(fp, p); 2655 return (error); 2656 } 2657 2658 /* 2659 * Sync an open file. 2660 */ 2661 /* ARGSUSED */ 2662 int 2663 sys_fsync(p, v, retval) 2664 struct proc *p; 2665 void *v; 2666 register_t *retval; 2667 { 2668 struct sys_fsync_args /* { 2669 syscallarg(int) fd; 2670 } */ *uap = v; 2671 register struct vnode *vp; 2672 struct file *fp; 2673 int error; 2674 2675 /* getvnode() will use the descriptor for us */ 2676 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2677 return (error); 2678 vp = (struct vnode *)fp->f_data; 2679 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2680 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2681 if (error == 0 && bioops.io_fsync != NULL && 2682 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2683 (*bioops.io_fsync)(vp); 2684 VOP_UNLOCK(vp, 0); 2685 FILE_UNUSE(fp, p); 2686 return (error); 2687 } 2688 2689 /* 2690 * Sync the data of an open file. 2691 */ 2692 /* ARGSUSED */ 2693 int 2694 sys_fdatasync(p, v, retval) 2695 struct proc *p; 2696 void *v; 2697 register_t *retval; 2698 { 2699 struct sys_fdatasync_args /* { 2700 syscallarg(int) fd; 2701 } */ *uap = v; 2702 struct vnode *vp; 2703 struct file *fp; 2704 int error; 2705 2706 /* getvnode() will use the descriptor for us */ 2707 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2708 return (error); 2709 vp = (struct vnode *)fp->f_data; 2710 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2711 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2712 if (error == 0 && bioops.io_fsync != NULL) 2713 (*bioops.io_fsync)(vp); 2714 VOP_UNLOCK(vp, 0); 2715 FILE_UNUSE(fp, p); 2716 return (error); 2717 } 2718 2719 /* 2720 * Rename files, (standard) BSD semantics frontend. 2721 */ 2722 /* ARGSUSED */ 2723 int 2724 sys_rename(p, v, retval) 2725 struct proc *p; 2726 void *v; 2727 register_t *retval; 2728 { 2729 register struct sys_rename_args /* { 2730 syscallarg(const char *) from; 2731 syscallarg(const char *) to; 2732 } */ *uap = v; 2733 2734 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2735 } 2736 2737 /* 2738 * Rename files, POSIX semantics frontend. 2739 */ 2740 /* ARGSUSED */ 2741 int 2742 sys___posix_rename(p, v, retval) 2743 struct proc *p; 2744 void *v; 2745 register_t *retval; 2746 { 2747 register struct sys___posix_rename_args /* { 2748 syscallarg(const char *) from; 2749 syscallarg(const char *) to; 2750 } */ *uap = v; 2751 2752 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2753 } 2754 2755 /* 2756 * Rename files. Source and destination must either both be directories, 2757 * or both not be directories. If target is a directory, it must be empty. 2758 * If `from' and `to' refer to the same object, the value of the `retain' 2759 * argument is used to determine whether `from' will be 2760 * 2761 * (retain == 0) deleted unless `from' and `to' refer to the same 2762 * object in the file system's name space (BSD). 2763 * (retain == 1) always retained (POSIX). 2764 */ 2765 static int 2766 rename_files(from, to, p, retain) 2767 const char *from, *to; 2768 struct proc *p; 2769 int retain; 2770 { 2771 register struct vnode *tvp, *fvp, *tdvp; 2772 struct nameidata fromnd, tond; 2773 int error; 2774 2775 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2776 from, p); 2777 if ((error = namei(&fromnd)) != 0) 2778 return (error); 2779 fvp = fromnd.ni_vp; 2780 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2781 UIO_USERSPACE, to, p); 2782 if ((error = namei(&tond)) != 0) { 2783 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2784 vrele(fromnd.ni_dvp); 2785 vrele(fvp); 2786 goto out1; 2787 } 2788 tdvp = tond.ni_dvp; 2789 tvp = tond.ni_vp; 2790 2791 if (tvp != NULL) { 2792 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2793 error = ENOTDIR; 2794 goto out; 2795 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2796 error = EISDIR; 2797 goto out; 2798 } 2799 } 2800 2801 if (fvp == tdvp) 2802 error = EINVAL; 2803 2804 /* 2805 * Source and destination refer to the same object. 2806 */ 2807 if (fvp == tvp) { 2808 if (retain) 2809 error = -1; 2810 else if (fromnd.ni_dvp == tdvp && 2811 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2812 !memcmp(fromnd.ni_cnd.cn_nameptr, 2813 tond.ni_cnd.cn_nameptr, 2814 fromnd.ni_cnd.cn_namelen)) 2815 error = -1; 2816 } 2817 2818 out: 2819 if (!error) { 2820 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2821 if (fromnd.ni_dvp != tdvp) 2822 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2823 if (tvp) { 2824 (void)uvm_vnp_uncache(tvp); 2825 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2826 } 2827 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2828 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2829 } else { 2830 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2831 if (tdvp == tvp) 2832 vrele(tdvp); 2833 else 2834 vput(tdvp); 2835 if (tvp) 2836 vput(tvp); 2837 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2838 vrele(fromnd.ni_dvp); 2839 vrele(fvp); 2840 } 2841 vrele(tond.ni_startdir); 2842 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2843 out1: 2844 if (fromnd.ni_startdir) 2845 vrele(fromnd.ni_startdir); 2846 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2847 return (error == -1 ? 0 : error); 2848 } 2849 2850 /* 2851 * Make a directory file. 2852 */ 2853 /* ARGSUSED */ 2854 int 2855 sys_mkdir(p, v, retval) 2856 struct proc *p; 2857 void *v; 2858 register_t *retval; 2859 { 2860 register struct sys_mkdir_args /* { 2861 syscallarg(const char *) path; 2862 syscallarg(int) mode; 2863 } */ *uap = v; 2864 register struct vnode *vp; 2865 struct vattr vattr; 2866 int error; 2867 struct nameidata nd; 2868 2869 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2870 if ((error = namei(&nd)) != 0) 2871 return (error); 2872 vp = nd.ni_vp; 2873 if (vp != NULL) { 2874 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2875 if (nd.ni_dvp == vp) 2876 vrele(nd.ni_dvp); 2877 else 2878 vput(nd.ni_dvp); 2879 vrele(vp); 2880 return (EEXIST); 2881 } 2882 VATTR_NULL(&vattr); 2883 vattr.va_type = VDIR; 2884 vattr.va_mode = 2885 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2886 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2887 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2888 if (!error) 2889 vput(nd.ni_vp); 2890 return (error); 2891 } 2892 2893 /* 2894 * Remove a directory file. 2895 */ 2896 /* ARGSUSED */ 2897 int 2898 sys_rmdir(p, v, retval) 2899 struct proc *p; 2900 void *v; 2901 register_t *retval; 2902 { 2903 struct sys_rmdir_args /* { 2904 syscallarg(const char *) path; 2905 } */ *uap = v; 2906 register struct vnode *vp; 2907 int error; 2908 struct nameidata nd; 2909 2910 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2911 SCARG(uap, path), p); 2912 if ((error = namei(&nd)) != 0) 2913 return (error); 2914 vp = nd.ni_vp; 2915 if (vp->v_type != VDIR) { 2916 error = ENOTDIR; 2917 goto out; 2918 } 2919 /* 2920 * No rmdir "." please. 2921 */ 2922 if (nd.ni_dvp == vp) { 2923 error = EINVAL; 2924 goto out; 2925 } 2926 /* 2927 * The root of a mounted filesystem cannot be deleted. 2928 */ 2929 if (vp->v_flag & VROOT) 2930 error = EBUSY; 2931 out: 2932 if (!error) { 2933 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2934 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2935 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2936 } else { 2937 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2938 if (nd.ni_dvp == vp) 2939 vrele(nd.ni_dvp); 2940 else 2941 vput(nd.ni_dvp); 2942 vput(vp); 2943 } 2944 return (error); 2945 } 2946 2947 /* 2948 * Read a block of directory entries in a file system independent format. 2949 */ 2950 int 2951 sys_getdents(p, v, retval) 2952 struct proc *p; 2953 void *v; 2954 register_t *retval; 2955 { 2956 register struct sys_getdents_args /* { 2957 syscallarg(int) fd; 2958 syscallarg(char *) buf; 2959 syscallarg(size_t) count; 2960 } */ *uap = v; 2961 struct file *fp; 2962 int error, done; 2963 2964 /* getvnode() will use the descriptor for us */ 2965 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2966 return (error); 2967 if ((fp->f_flag & FREAD) == 0) { 2968 error = EBADF; 2969 goto out; 2970 } 2971 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 2972 SCARG(uap, count), &done, p, 0, 0); 2973 *retval = done; 2974 out: 2975 FILE_UNUSE(fp, p); 2976 return (error); 2977 } 2978 2979 /* 2980 * Set the mode mask for creation of filesystem nodes. 2981 */ 2982 int 2983 sys_umask(p, v, retval) 2984 struct proc *p; 2985 void *v; 2986 register_t *retval; 2987 { 2988 struct sys_umask_args /* { 2989 syscallarg(mode_t) newmask; 2990 } */ *uap = v; 2991 struct cwdinfo *cwdi; 2992 2993 cwdi = p->p_cwdi; 2994 *retval = cwdi->cwdi_cmask; 2995 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 2996 return (0); 2997 } 2998 2999 /* 3000 * Void all references to file by ripping underlying filesystem 3001 * away from vnode. 3002 */ 3003 /* ARGSUSED */ 3004 int 3005 sys_revoke(p, v, retval) 3006 struct proc *p; 3007 void *v; 3008 register_t *retval; 3009 { 3010 register struct sys_revoke_args /* { 3011 syscallarg(const char *) path; 3012 } */ *uap = v; 3013 register struct vnode *vp; 3014 struct vattr vattr; 3015 int error; 3016 struct nameidata nd; 3017 3018 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3019 if ((error = namei(&nd)) != 0) 3020 return (error); 3021 vp = nd.ni_vp; 3022 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3023 goto out; 3024 if (p->p_ucred->cr_uid != vattr.va_uid && 3025 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3026 goto out; 3027 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3028 VOP_REVOKE(vp, REVOKEALL); 3029 out: 3030 vrele(vp); 3031 return (error); 3032 } 3033 3034 /* 3035 * Convert a user file descriptor to a kernel file entry. 3036 */ 3037 int 3038 getvnode(fdp, fd, fpp) 3039 struct filedesc *fdp; 3040 int fd; 3041 struct file **fpp; 3042 { 3043 struct vnode *vp; 3044 struct file *fp; 3045 3046 if ((u_int)fd >= fdp->fd_nfiles || 3047 (fp = fdp->fd_ofiles[fd]) == NULL || 3048 (fp->f_iflags & FIF_WANTCLOSE) != 0) 3049 return (EBADF); 3050 3051 FILE_USE(fp); 3052 3053 if (fp->f_type != DTYPE_VNODE) { 3054 FILE_UNUSE(fp, NULL); 3055 return (EINVAL); 3056 } 3057 3058 vp = (struct vnode *)fp->f_data; 3059 if (vp->v_type == VBAD) { 3060 FILE_UNUSE(fp, NULL); 3061 return (EBADF); 3062 } 3063 3064 *fpp = fp; 3065 return (0); 3066 } 3067
Indexes created Fri Sep 26 20:09:58 GMT 2025